ibmvfc.c

   1// SPDX-License-Identifier: GPL-2.0-or-later
   2/*
   3 * ibmvfc.c -- driver for IBM Power Virtual Fibre Channel Adapter
   4 *
   5 * Written By: Brian King <brking@linux.vnet.ibm.com>, IBM Corporation
   6 *
   7 * Copyright (C) IBM Corporation, 2008
   8 */
   9
  10#include <linux/module.h>
  11#include <linux/moduleparam.h>
  12#include <linux/dma-mapping.h>
  13#include <linux/dmapool.h>
  14#include <linux/delay.h>
  15#include <linux/interrupt.h>
  16#include <linux/irqdomain.h>
  17#include <linux/kthread.h>
  18#include <linux/slab.h>
  19#include <linux/of.h>
  20#include <linux/pm.h>
  21#include <linux/stringify.h>
  22#include <linux/bsg-lib.h>
  23#include <asm/firmware.h>
  24#include <asm/irq.h>
  25#include <asm/vio.h>
  26#include <scsi/scsi.h>
  27#include <scsi/scsi_cmnd.h>
  28#include <scsi/scsi_host.h>
  29#include <scsi/scsi_device.h>
  30#include <scsi/scsi_tcq.h>
  31#include <scsi/scsi_transport_fc.h>
  32#include <scsi/scsi_bsg_fc.h>
  33#include "ibmvfc.h"
  34
  35static unsigned int init_timeout = IBMVFC_INIT_TIMEOUT;
  36static unsigned int default_timeout = IBMVFC_DEFAULT_TIMEOUT;
  37static u64 max_lun = IBMVFC_MAX_LUN;
  38static unsigned int max_targets = IBMVFC_MAX_TARGETS;
  39static unsigned int max_requests = IBMVFC_MAX_REQUESTS_DEFAULT;
  40static u16 max_sectors = IBMVFC_MAX_SECTORS;
  41static u16 scsi_qdepth = IBMVFC_SCSI_QDEPTH;
  42static unsigned int disc_threads = IBMVFC_MAX_DISC_THREADS;
  43static unsigned int ibmvfc_debug = IBMVFC_DEBUG;
  44static unsigned int log_level = IBMVFC_DEFAULT_LOG_LEVEL;
  45static unsigned int cls3_error = IBMVFC_CLS3_ERROR;
  46static unsigned int mq_enabled = IBMVFC_MQ;
  47static unsigned int nr_scsi_hw_queues = IBMVFC_SCSI_HW_QUEUES;
  48static unsigned int nr_scsi_channels = IBMVFC_SCSI_CHANNELS;
  49static unsigned int mig_channels_only = IBMVFC_MIG_NO_SUB_TO_CRQ;
  50static unsigned int mig_no_less_channels = IBMVFC_MIG_NO_N_TO_M;
  51
  52static LIST_HEAD(ibmvfc_head);
  53static DEFINE_SPINLOCK(ibmvfc_driver_lock);
  54static struct scsi_transport_template *ibmvfc_transport_template;
  55
  56MODULE_DESCRIPTION("IBM Virtual Fibre Channel Driver");
  57MODULE_AUTHOR("Brian King <brking@linux.vnet.ibm.com>");
  58MODULE_LICENSE("GPL");
  59MODULE_VERSION(IBMVFC_DRIVER_VERSION);
  60
  61module_param_named(mq, mq_enabled, uint, S_IRUGO);
  62MODULE_PARM_DESC(mq, "Enable multiqueue support. "
  63		 "[Default=" __stringify(IBMVFC_MQ) "]");
  64module_param_named(scsi_host_queues, nr_scsi_hw_queues, uint, S_IRUGO);
  65MODULE_PARM_DESC(scsi_host_queues, "Number of SCSI Host submission queues. "
  66		 "[Default=" __stringify(IBMVFC_SCSI_HW_QUEUES) "]");
  67module_param_named(scsi_hw_channels, nr_scsi_channels, uint, S_IRUGO);
  68MODULE_PARM_DESC(scsi_hw_channels, "Number of hw scsi channels to request. "
  69		 "[Default=" __stringify(IBMVFC_SCSI_CHANNELS) "]");
  70module_param_named(mig_channels_only, mig_channels_only, uint, S_IRUGO);
  71MODULE_PARM_DESC(mig_channels_only, "Prevent migration to non-channelized system. "
  72		 "[Default=" __stringify(IBMVFC_MIG_NO_SUB_TO_CRQ) "]");
  73module_param_named(mig_no_less_channels, mig_no_less_channels, uint, S_IRUGO);
  74MODULE_PARM_DESC(mig_no_less_channels, "Prevent migration to system with less channels. "
  75		 "[Default=" __stringify(IBMVFC_MIG_NO_N_TO_M) "]");
  76
  77module_param_named(init_timeout, init_timeout, uint, S_IRUGO | S_IWUSR);
  78MODULE_PARM_DESC(init_timeout, "Initialization timeout in seconds. "
  79		 "[Default=" __stringify(IBMVFC_INIT_TIMEOUT) "]");
  80module_param_named(default_timeout, default_timeout, uint, S_IRUGO | S_IWUSR);
  81MODULE_PARM_DESC(default_timeout,
  82		 "Default timeout in seconds for initialization and EH commands. "
  83		 "[Default=" __stringify(IBMVFC_DEFAULT_TIMEOUT) "]");
  84module_param_named(max_requests, max_requests, uint, S_IRUGO);
  85MODULE_PARM_DESC(max_requests, "Maximum requests for this adapter. "
  86		 "[Default=" __stringify(IBMVFC_MAX_REQUESTS_DEFAULT) "]");
  87module_param_named(max_sectors, max_sectors, ushort, S_IRUGO);
  88MODULE_PARM_DESC(max_sectors, "Maximum sectors for this adapter. "
  89		 "[Default=" __stringify(IBMVFC_MAX_SECTORS) "]");
  90module_param_named(scsi_qdepth, scsi_qdepth, ushort, S_IRUGO);
  91MODULE_PARM_DESC(scsi_qdepth, "Maximum scsi command depth per adapter queue. "
  92		 "[Default=" __stringify(IBMVFC_SCSI_QDEPTH) "]");
  93module_param_named(max_lun, max_lun, ullong, S_IRUGO);
  94MODULE_PARM_DESC(max_lun, "Maximum allowed LUN. "
  95		 "[Default=" __stringify(IBMVFC_MAX_LUN) "]");
  96module_param_named(max_targets, max_targets, uint, S_IRUGO);
  97MODULE_PARM_DESC(max_targets, "Maximum allowed targets. "
  98		 "[Default=" __stringify(IBMVFC_MAX_TARGETS) "]");
  99module_param_named(disc_threads, disc_threads, uint, S_IRUGO);
 100MODULE_PARM_DESC(disc_threads, "Number of device discovery threads to use. "
 101		 "[Default=" __stringify(IBMVFC_MAX_DISC_THREADS) "]");
 102module_param_named(debug, ibmvfc_debug, uint, S_IRUGO | S_IWUSR);
 103MODULE_PARM_DESC(debug, "Enable driver debug information. "
 104		 "[Default=" __stringify(IBMVFC_DEBUG) "]");
 105module_param_named(log_level, log_level, uint, 0);
 106MODULE_PARM_DESC(log_level, "Set to 0 - 4 for increasing verbosity of device driver. "
 107		 "[Default=" __stringify(IBMVFC_DEFAULT_LOG_LEVEL) "]");
 108module_param_named(cls3_error, cls3_error, uint, 0);
 109MODULE_PARM_DESC(cls3_error, "Enable FC Class 3 Error Recovery. "
 110		 "[Default=" __stringify(IBMVFC_CLS3_ERROR) "]");
 111
 112static const struct {
 113	u16 status;
 114	u16 error;
 115	u8 result;
 116	u8 retry;
 117	int log;
 118	char *name;
 119} cmd_status [] = {
 120	{ IBMVFC_FABRIC_MAPPED, IBMVFC_UNABLE_TO_ESTABLISH, DID_ERROR, 1, 1, "unable to establish" },
 121	{ IBMVFC_FABRIC_MAPPED, IBMVFC_XPORT_FAULT, DID_OK, 1, 0, "transport fault" },
 122	{ IBMVFC_FABRIC_MAPPED, IBMVFC_CMD_TIMEOUT, DID_TIME_OUT, 1, 1, "command timeout" },
 123	{ IBMVFC_FABRIC_MAPPED, IBMVFC_ENETDOWN, DID_TRANSPORT_DISRUPTED, 1, 1, "network down" },
 124	{ IBMVFC_FABRIC_MAPPED, IBMVFC_HW_FAILURE, DID_ERROR, 1, 1, "hardware failure" },
 125	{ IBMVFC_FABRIC_MAPPED, IBMVFC_LINK_DOWN_ERR, DID_REQUEUE, 0, 0, "link down" },
 126	{ IBMVFC_FABRIC_MAPPED, IBMVFC_LINK_DEAD_ERR, DID_ERROR, 0, 0, "link dead" },
 127	{ IBMVFC_FABRIC_MAPPED, IBMVFC_UNABLE_TO_REGISTER, DID_ERROR, 1, 1, "unable to register" },
 128	{ IBMVFC_FABRIC_MAPPED, IBMVFC_XPORT_BUSY, DID_BUS_BUSY, 1, 0, "transport busy" },
 129	{ IBMVFC_FABRIC_MAPPED, IBMVFC_XPORT_DEAD, DID_ERROR, 0, 1, "transport dead" },
 130	{ IBMVFC_FABRIC_MAPPED, IBMVFC_CONFIG_ERROR, DID_ERROR, 1, 1, "configuration error" },
 131	{ IBMVFC_FABRIC_MAPPED, IBMVFC_NAME_SERVER_FAIL, DID_ERROR, 1, 1, "name server failure" },
 132	{ IBMVFC_FABRIC_MAPPED, IBMVFC_LINK_HALTED, DID_REQUEUE, 1, 0, "link halted" },
 133	{ IBMVFC_FABRIC_MAPPED, IBMVFC_XPORT_GENERAL, DID_OK, 1, 0, "general transport error" },
 134
 135	{ IBMVFC_VIOS_FAILURE, IBMVFC_CRQ_FAILURE, DID_REQUEUE, 1, 1, "CRQ failure" },
 136	{ IBMVFC_VIOS_FAILURE, IBMVFC_SW_FAILURE, DID_ERROR, 0, 1, "software failure" },
 137	{ IBMVFC_VIOS_FAILURE, IBMVFC_INVALID_PARAMETER, DID_ERROR, 0, 1, "invalid parameter" },
 138	{ IBMVFC_VIOS_FAILURE, IBMVFC_MISSING_PARAMETER, DID_ERROR, 0, 1, "missing parameter" },
 139	{ IBMVFC_VIOS_FAILURE, IBMVFC_HOST_IO_BUS, DID_ERROR, 1, 1, "host I/O bus failure" },
 140	{ IBMVFC_VIOS_FAILURE, IBMVFC_TRANS_CANCELLED, DID_ERROR, 0, 1, "transaction cancelled" },
 141	{ IBMVFC_VIOS_FAILURE, IBMVFC_TRANS_CANCELLED_IMPLICIT, DID_ERROR, 0, 1, "transaction cancelled implicit" },
 142	{ IBMVFC_VIOS_FAILURE, IBMVFC_INSUFFICIENT_RESOURCE, DID_REQUEUE, 1, 1, "insufficient resources" },
 143	{ IBMVFC_VIOS_FAILURE, IBMVFC_PLOGI_REQUIRED, DID_ERROR, 0, 1, "port login required" },
 144	{ IBMVFC_VIOS_FAILURE, IBMVFC_COMMAND_FAILED, DID_ERROR, 1, 1, "command failed" },
 145
 146	{ IBMVFC_FC_FAILURE, IBMVFC_INVALID_ELS_CMD_CODE, DID_ERROR, 0, 1, "invalid ELS command code" },
 147	{ IBMVFC_FC_FAILURE, IBMVFC_INVALID_VERSION, DID_ERROR, 0, 1, "invalid version level" },
 148	{ IBMVFC_FC_FAILURE, IBMVFC_LOGICAL_ERROR, DID_ERROR, 1, 1, "logical error" },
 149	{ IBMVFC_FC_FAILURE, IBMVFC_INVALID_CT_IU_SIZE, DID_ERROR, 0, 1, "invalid CT_IU size" },
 150	{ IBMVFC_FC_FAILURE, IBMVFC_LOGICAL_BUSY, DID_REQUEUE, 1, 0, "logical busy" },
 151	{ IBMVFC_FC_FAILURE, IBMVFC_PROTOCOL_ERROR, DID_ERROR, 1, 1, "protocol error" },
 152	{ IBMVFC_FC_FAILURE, IBMVFC_UNABLE_TO_PERFORM_REQ, DID_ERROR, 1, 1, "unable to perform request" },
 153	{ IBMVFC_FC_FAILURE, IBMVFC_CMD_NOT_SUPPORTED, DID_ERROR, 0, 0, "command not supported" },
 154	{ IBMVFC_FC_FAILURE, IBMVFC_SERVER_NOT_AVAIL, DID_ERROR, 0, 1, "server not available" },
 155	{ IBMVFC_FC_FAILURE, IBMVFC_CMD_IN_PROGRESS, DID_ERROR, 0, 1, "command already in progress" },
 156	{ IBMVFC_FC_FAILURE, IBMVFC_VENDOR_SPECIFIC, DID_ERROR, 1, 1, "vendor specific" },
 157
 158	{ IBMVFC_FC_SCSI_ERROR, 0, DID_OK, 1, 0, "SCSI error" },
 159	{ IBMVFC_FC_SCSI_ERROR, IBMVFC_COMMAND_FAILED, DID_ERROR, 0, 1, "PRLI to device failed." },
 160};
 161
 162static void ibmvfc_npiv_login(struct ibmvfc_host *);
 163static void ibmvfc_tgt_send_prli(struct ibmvfc_target *);
 164static void ibmvfc_tgt_send_plogi(struct ibmvfc_target *);
 165static void ibmvfc_tgt_query_target(struct ibmvfc_target *);
 166static void ibmvfc_npiv_logout(struct ibmvfc_host *);
 167static void ibmvfc_tgt_implicit_logout_and_del(struct ibmvfc_target *);
 168static void ibmvfc_tgt_move_login(struct ibmvfc_target *);
 169
 170static void ibmvfc_dereg_sub_crqs(struct ibmvfc_host *, struct ibmvfc_channels *);
 171static void ibmvfc_reg_sub_crqs(struct ibmvfc_host *, struct ibmvfc_channels *);
 172
 173static const char *unknown_error = "unknown error";
 174
 175static long h_reg_sub_crq(unsigned long unit_address, unsigned long ioba,
 176			  unsigned long length, unsigned long *cookie,
 177			  unsigned long *irq)
 178{
 179	unsigned long retbuf[PLPAR_HCALL_BUFSIZE];
 180	long rc;
 181
 182	rc = plpar_hcall(H_REG_SUB_CRQ, retbuf, unit_address, ioba, length);
 183	*cookie = retbuf[0];
 184	*irq = retbuf[1];
 185
 186	return rc;
 187}
 188
 189static int ibmvfc_check_caps(struct ibmvfc_host *vhost, unsigned long cap_flags)
 190{
 191	u64 host_caps = be64_to_cpu(vhost->login_buf->resp.capabilities);
 192
 193	return (host_caps & cap_flags) ? 1 : 0;
 194}
 195
 196static struct ibmvfc_fcp_cmd_iu *ibmvfc_get_fcp_iu(struct ibmvfc_host *vhost,
 197						   struct ibmvfc_cmd *vfc_cmd)
 198{
 199	if (ibmvfc_check_caps(vhost, IBMVFC_HANDLE_VF_WWPN))
 200		return &vfc_cmd->v2.iu;
 201	else
 202		return &vfc_cmd->v1.iu;
 203}
 204
 205static struct ibmvfc_fcp_rsp *ibmvfc_get_fcp_rsp(struct ibmvfc_host *vhost,
 206						 struct ibmvfc_cmd *vfc_cmd)
 207{
 208	if (ibmvfc_check_caps(vhost, IBMVFC_HANDLE_VF_WWPN))
 209		return &vfc_cmd->v2.rsp;
 210	else
 211		return &vfc_cmd->v1.rsp;
 212}
 213
 214#ifdef CONFIG_SCSI_IBMVFC_TRACE
 215/**
 216 * ibmvfc_trc_start - Log a start trace entry
 217 * @evt:		ibmvfc event struct
 218 *
 219 **/
 220static void ibmvfc_trc_start(struct ibmvfc_event *evt)
 221{
 222	struct ibmvfc_host *vhost = evt->vhost;
 223	struct ibmvfc_cmd *vfc_cmd = &evt->iu.cmd;
 224	struct ibmvfc_mad_common *mad = &evt->iu.mad_common;
 225	struct ibmvfc_fcp_cmd_iu *iu = ibmvfc_get_fcp_iu(vhost, vfc_cmd);
 226	struct ibmvfc_trace_entry *entry;
 227	int index = atomic_inc_return(&vhost->trace_index) & IBMVFC_TRACE_INDEX_MASK;
 228
 229	entry = &vhost->trace[index];
 230	entry->evt = evt;
 231	entry->time = jiffies;
 232	entry->fmt = evt->crq.format;
 233	entry->type = IBMVFC_TRC_START;
 234
 235	switch (entry->fmt) {
 236	case IBMVFC_CMD_FORMAT:
 237		entry->op_code = iu->cdb[0];
 238		entry->scsi_id = be64_to_cpu(vfc_cmd->tgt_scsi_id);
 239		entry->lun = scsilun_to_int(&iu->lun);
 240		entry->tmf_flags = iu->tmf_flags;
 241		entry->u.start.xfer_len = be32_to_cpu(iu->xfer_len);
 242		break;
 243	case IBMVFC_MAD_FORMAT:
 244		entry->op_code = be32_to_cpu(mad->opcode);
 245		break;
 246	default:
 247		break;
 248	}
 249}
 250
 251/**
 252 * ibmvfc_trc_end - Log an end trace entry
 253 * @evt:		ibmvfc event struct
 254 *
 255 **/
 256static void ibmvfc_trc_end(struct ibmvfc_event *evt)
 257{
 258	struct ibmvfc_host *vhost = evt->vhost;
 259	struct ibmvfc_cmd *vfc_cmd = &evt->xfer_iu->cmd;
 260	struct ibmvfc_mad_common *mad = &evt->xfer_iu->mad_common;
 261	struct ibmvfc_fcp_cmd_iu *iu = ibmvfc_get_fcp_iu(vhost, vfc_cmd);
 262	struct ibmvfc_fcp_rsp *rsp = ibmvfc_get_fcp_rsp(vhost, vfc_cmd);
 263	struct ibmvfc_trace_entry *entry;
 264	int index = atomic_inc_return(&vhost->trace_index) & IBMVFC_TRACE_INDEX_MASK;
 265
 266	entry = &vhost->trace[index];
 267	entry->evt = evt;
 268	entry->time = jiffies;
 269	entry->fmt = evt->crq.format;
 270	entry->type = IBMVFC_TRC_END;
 271
 272	switch (entry->fmt) {
 273	case IBMVFC_CMD_FORMAT:
 274		entry->op_code = iu->cdb[0];
 275		entry->scsi_id = be64_to_cpu(vfc_cmd->tgt_scsi_id);
 276		entry->lun = scsilun_to_int(&iu->lun);
 277		entry->tmf_flags = iu->tmf_flags;
 278		entry->u.end.status = be16_to_cpu(vfc_cmd->status);
 279		entry->u.end.error = be16_to_cpu(vfc_cmd->error);
 280		entry->u.end.fcp_rsp_flags = rsp->flags;
 281		entry->u.end.rsp_code = rsp->data.info.rsp_code;
 282		entry->u.end.scsi_status = rsp->scsi_status;
 283		break;
 284	case IBMVFC_MAD_FORMAT:
 285		entry->op_code = be32_to_cpu(mad->opcode);
 286		entry->u.end.status = be16_to_cpu(mad->status);
 287		break;
 288	default:
 289		break;
 290
 291	}
 292}
 293
 294#else
 295#define ibmvfc_trc_start(evt) do { } while (0)
 296#define ibmvfc_trc_end(evt) do { } while (0)
 297#endif
 298
 299/**
 300 * ibmvfc_get_err_index - Find the index into cmd_status for the fcp response
 301 * @status:		status / error class
 302 * @error:		error
 303 *
 304 * Return value:
 305 *	index into cmd_status / -EINVAL on failure
 306 **/
 307static int ibmvfc_get_err_index(u16 status, u16 error)
 308{
 309	int i;
 310
 311	for (i = 0; i < ARRAY_SIZE(cmd_status); i++)
 312		if ((cmd_status[i].status & status) == cmd_status[i].status &&
 313		    cmd_status[i].error == error)
 314			return i;
 315
 316	return -EINVAL;
 317}
 318
 319/**
 320 * ibmvfc_get_cmd_error - Find the error description for the fcp response
 321 * @status:		status / error class
 322 * @error:		error
 323 *
 324 * Return value:
 325 *	error description string
 326 **/
 327static const char *ibmvfc_get_cmd_error(u16 status, u16 error)
 328{
 329	int rc = ibmvfc_get_err_index(status, error);
 330	if (rc >= 0)
 331		return cmd_status[rc].name;
 332	return unknown_error;
 333}
 334
 335/**
 336 * ibmvfc_get_err_result - Find the scsi status to return for the fcp response
 337 * @vhost:      ibmvfc host struct
 338 * @vfc_cmd:	ibmvfc command struct
 339 *
 340 * Return value:
 341 *	SCSI result value to return for completed command
 342 **/
 343static int ibmvfc_get_err_result(struct ibmvfc_host *vhost, struct ibmvfc_cmd *vfc_cmd)
 344{
 345	int err;
 346	struct ibmvfc_fcp_rsp *rsp = ibmvfc_get_fcp_rsp(vhost, vfc_cmd);
 347	int fc_rsp_len = be32_to_cpu(rsp->fcp_rsp_len);
 348
 349	if ((rsp->flags & FCP_RSP_LEN_VALID) &&
 350	    ((fc_rsp_len && fc_rsp_len != 4 && fc_rsp_len != 8) ||
 351	     rsp->data.info.rsp_code))
 352		return DID_ERROR << 16;
 353
 354	err = ibmvfc_get_err_index(be16_to_cpu(vfc_cmd->status), be16_to_cpu(vfc_cmd->error));
 355	if (err >= 0)
 356		return rsp->scsi_status | (cmd_status[err].result << 16);
 357	return rsp->scsi_status | (DID_ERROR << 16);
 358}
 359
 360/**
 361 * ibmvfc_retry_cmd - Determine if error status is retryable
 362 * @status:		status / error class
 363 * @error:		error
 364 *
 365 * Return value:
 366 *	1 if error should be retried / 0 if it should not
 367 **/
 368static int ibmvfc_retry_cmd(u16 status, u16 error)
 369{
 370	int rc = ibmvfc_get_err_index(status, error);
 371
 372	if (rc >= 0)
 373		return cmd_status[rc].retry;
 374	return 1;
 375}
 376
 377static const char *unknown_fc_explain = "unknown fc explain";
 378
 379static const struct {
 380	u16 fc_explain;
 381	char *name;
 382} ls_explain [] = {
 383	{ 0x00, "no additional explanation" },
 384	{ 0x01, "service parameter error - options" },
 385	{ 0x03, "service parameter error - initiator control" },
 386	{ 0x05, "service parameter error - recipient control" },
 387	{ 0x07, "service parameter error - received data field size" },
 388	{ 0x09, "service parameter error - concurrent seq" },
 389	{ 0x0B, "service parameter error - credit" },
 390	{ 0x0D, "invalid N_Port/F_Port_Name" },
 391	{ 0x0E, "invalid node/Fabric Name" },
 392	{ 0x0F, "invalid common service parameters" },
 393	{ 0x11, "invalid association header" },
 394	{ 0x13, "association header required" },
 395	{ 0x15, "invalid originator S_ID" },
 396	{ 0x17, "invalid OX_ID-RX-ID combination" },
 397	{ 0x19, "command (request) already in progress" },
 398	{ 0x1E, "N_Port Login requested" },
 399	{ 0x1F, "Invalid N_Port_ID" },
 400};
 401
 402static const struct {
 403	u16 fc_explain;
 404	char *name;
 405} gs_explain [] = {
 406	{ 0x00, "no additional explanation" },
 407	{ 0x01, "port identifier not registered" },
 408	{ 0x02, "port name not registered" },
 409	{ 0x03, "node name not registered" },
 410	{ 0x04, "class of service not registered" },
 411	{ 0x06, "initial process associator not registered" },
 412	{ 0x07, "FC-4 TYPEs not registered" },
 413	{ 0x08, "symbolic port name not registered" },
 414	{ 0x09, "symbolic node name not registered" },
 415	{ 0x0A, "port type not registered" },
 416	{ 0xF0, "authorization exception" },
 417	{ 0xF1, "authentication exception" },
 418	{ 0xF2, "data base full" },
 419	{ 0xF3, "data base empty" },
 420	{ 0xF4, "processing request" },
 421	{ 0xF5, "unable to verify connection" },
 422	{ 0xF6, "devices not in a common zone" },
 423};
 424
 425/**
 426 * ibmvfc_get_ls_explain - Return the FC Explain description text
 427 * @status:	FC Explain status
 428 *
 429 * Returns:
 430 *	error string
 431 **/
 432static const char *ibmvfc_get_ls_explain(u16 status)
 433{
 434	int i;
 435
 436	for (i = 0; i < ARRAY_SIZE(ls_explain); i++)
 437		if (ls_explain[i].fc_explain == status)
 438			return ls_explain[i].name;
 439
 440	return unknown_fc_explain;
 441}
 442
 443/**
 444 * ibmvfc_get_gs_explain - Return the FC Explain description text
 445 * @status:	FC Explain status
 446 *
 447 * Returns:
 448 *	error string
 449 **/
 450static const char *ibmvfc_get_gs_explain(u16 status)
 451{
 452	int i;
 453
 454	for (i = 0; i < ARRAY_SIZE(gs_explain); i++)
 455		if (gs_explain[i].fc_explain == status)
 456			return gs_explain[i].name;
 457
 458	return unknown_fc_explain;
 459}
 460
 461static const struct {
 462	enum ibmvfc_fc_type fc_type;
 463	char *name;
 464} fc_type [] = {
 465	{ IBMVFC_FABRIC_REJECT, "fabric reject" },
 466	{ IBMVFC_PORT_REJECT, "port reject" },
 467	{ IBMVFC_LS_REJECT, "ELS reject" },
 468	{ IBMVFC_FABRIC_BUSY, "fabric busy" },
 469	{ IBMVFC_PORT_BUSY, "port busy" },
 470	{ IBMVFC_BASIC_REJECT, "basic reject" },
 471};
 472
 473static const char *unknown_fc_type = "unknown fc type";
 474
 475/**
 476 * ibmvfc_get_fc_type - Return the FC Type description text
 477 * @status:	FC Type error status
 478 *
 479 * Returns:
 480 *	error string
 481 **/
 482static const char *ibmvfc_get_fc_type(u16 status)
 483{
 484	int i;
 485
 486	for (i = 0; i < ARRAY_SIZE(fc_type); i++)
 487		if (fc_type[i].fc_type == status)
 488			return fc_type[i].name;
 489
 490	return unknown_fc_type;
 491}
 492
 493/**
 494 * ibmvfc_set_tgt_action - Set the next init action for the target
 495 * @tgt:		ibmvfc target struct
 496 * @action:		action to perform
 497 *
 498 * Returns:
 499 *	0 if action changed / non-zero if not changed
 500 **/
 501static int ibmvfc_set_tgt_action(struct ibmvfc_target *tgt,
 502				  enum ibmvfc_target_action action)
 503{
 504	int rc = -EINVAL;
 505
 506	switch (tgt->action) {
 507	case IBMVFC_TGT_ACTION_LOGOUT_RPORT:
 508		if (action == IBMVFC_TGT_ACTION_LOGOUT_RPORT_WAIT ||
 509		    action == IBMVFC_TGT_ACTION_DEL_RPORT) {
 510			tgt->action = action;
 511			rc = 0;
 512		}
 513		break;
 514	case IBMVFC_TGT_ACTION_LOGOUT_RPORT_WAIT:
 515		if (action == IBMVFC_TGT_ACTION_DEL_RPORT ||
 516		    action == IBMVFC_TGT_ACTION_DEL_AND_LOGOUT_RPORT) {
 517			tgt->action = action;
 518			rc = 0;
 519		}
 520		break;
 521	case IBMVFC_TGT_ACTION_LOGOUT_DELETED_RPORT:
 522		if (action == IBMVFC_TGT_ACTION_LOGOUT_RPORT) {
 523			tgt->action = action;
 524			rc = 0;
 525		}
 526		break;
 527	case IBMVFC_TGT_ACTION_DEL_AND_LOGOUT_RPORT:
 528		if (action == IBMVFC_TGT_ACTION_LOGOUT_DELETED_RPORT) {
 529			tgt->action = action;
 530			rc = 0;
 531		}
 532		break;
 533	case IBMVFC_TGT_ACTION_DEL_RPORT:
 534		if (action == IBMVFC_TGT_ACTION_DELETED_RPORT) {
 535			tgt->action = action;
 536			rc = 0;
 537		}
 538		break;
 539	case IBMVFC_TGT_ACTION_DELETED_RPORT:
 540		break;
 541	default:
 542		tgt->action = action;
 543		rc = 0;
 544		break;
 545	}
 546
 547	if (action >= IBMVFC_TGT_ACTION_LOGOUT_RPORT)
 548		tgt->add_rport = 0;
 549
 550	return rc;
 551}
 552
 553/**
 554 * ibmvfc_set_host_state - Set the state for the host
 555 * @vhost:		ibmvfc host struct
 556 * @state:		state to set host to
 557 *
 558 * Returns:
 559 *	0 if state changed / non-zero if not changed
 560 **/
 561static int ibmvfc_set_host_state(struct ibmvfc_host *vhost,
 562				  enum ibmvfc_host_state state)
 563{
 564	int rc = 0;
 565
 566	switch (vhost->state) {
 567	case IBMVFC_HOST_OFFLINE:
 568		rc = -EINVAL;
 569		break;
 570	default:
 571		vhost->state = state;
 572		break;
 573	}
 574
 575	return rc;
 576}
 577
 578/**
 579 * ibmvfc_set_host_action - Set the next init action for the host
 580 * @vhost:		ibmvfc host struct
 581 * @action:		action to perform
 582 *
 583 **/
 584static void ibmvfc_set_host_action(struct ibmvfc_host *vhost,
 585				   enum ibmvfc_host_action action)
 586{
 587	switch (action) {
 588	case IBMVFC_HOST_ACTION_ALLOC_TGTS:
 589		if (vhost->action == IBMVFC_HOST_ACTION_INIT_WAIT)
 590			vhost->action = action;
 591		break;
 592	case IBMVFC_HOST_ACTION_LOGO_WAIT:
 593		if (vhost->action == IBMVFC_HOST_ACTION_LOGO)
 594			vhost->action = action;
 595		break;
 596	case IBMVFC_HOST_ACTION_INIT_WAIT:
 597		if (vhost->action == IBMVFC_HOST_ACTION_INIT)
 598			vhost->action = action;
 599		break;
 600	case IBMVFC_HOST_ACTION_QUERY:
 601		switch (vhost->action) {
 602		case IBMVFC_HOST_ACTION_INIT_WAIT:
 603		case IBMVFC_HOST_ACTION_NONE:
 604		case IBMVFC_HOST_ACTION_TGT_DEL_FAILED:
 605			vhost->action = action;
 606			break;
 607		default:
 608			break;
 609		}
 610		break;
 611	case IBMVFC_HOST_ACTION_TGT_INIT:
 612		if (vhost->action == IBMVFC_HOST_ACTION_ALLOC_TGTS)
 613			vhost->action = action;
 614		break;
 615	case IBMVFC_HOST_ACTION_REENABLE:
 616	case IBMVFC_HOST_ACTION_RESET:
 617		vhost->action = action;
 618		break;
 619	case IBMVFC_HOST_ACTION_INIT:
 620	case IBMVFC_HOST_ACTION_TGT_DEL:
 621	case IBMVFC_HOST_ACTION_LOGO:
 622	case IBMVFC_HOST_ACTION_QUERY_TGTS:
 623	case IBMVFC_HOST_ACTION_TGT_DEL_FAILED:
 624	case IBMVFC_HOST_ACTION_NONE:
 625	default:
 626		switch (vhost->action) {
 627		case IBMVFC_HOST_ACTION_RESET:
 628		case IBMVFC_HOST_ACTION_REENABLE:
 629			break;
 630		default:
 631			vhost->action = action;
 632			break;
 633		}
 634		break;
 635	}
 636}
 637
 638/**
 639 * ibmvfc_reinit_host - Re-start host initialization (no NPIV Login)
 640 * @vhost:		ibmvfc host struct
 641 *
 642 * Return value:
 643 *	nothing
 644 **/
 645static void ibmvfc_reinit_host(struct ibmvfc_host *vhost)
 646{
 647	if (vhost->action == IBMVFC_HOST_ACTION_NONE &&
 648	    vhost->state == IBMVFC_ACTIVE) {
 649		if (!ibmvfc_set_host_state(vhost, IBMVFC_INITIALIZING)) {
 650			scsi_block_requests(vhost->host);
 651			ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_QUERY);
 652		}
 653	} else
 654		vhost->reinit = 1;
 655
 656	wake_up(&vhost->work_wait_q);
 657}
 658
 659/**
 660 * ibmvfc_del_tgt - Schedule cleanup and removal of the target
 661 * @tgt:		ibmvfc target struct
 662 **/
 663static void ibmvfc_del_tgt(struct ibmvfc_target *tgt)
 664{
 665	if (!ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_LOGOUT_RPORT)) {
 666		tgt->job_step = ibmvfc_tgt_implicit_logout_and_del;
 667		tgt->init_retries = 0;
 668	}
 669	wake_up(&tgt->vhost->work_wait_q);
 670}
 671
 672/**
 673 * ibmvfc_link_down - Handle a link down event from the adapter
 674 * @vhost:	ibmvfc host struct
 675 * @state:	ibmvfc host state to enter
 676 *
 677 **/
 678static void ibmvfc_link_down(struct ibmvfc_host *vhost,
 679			     enum ibmvfc_host_state state)
 680{
 681	struct ibmvfc_target *tgt;
 682
 683	ENTER;
 684	scsi_block_requests(vhost->host);
 685	list_for_each_entry(tgt, &vhost->targets, queue)
 686		ibmvfc_del_tgt(tgt);
 687	ibmvfc_set_host_state(vhost, state);
 688	ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_TGT_DEL);
 689	vhost->events_to_log |= IBMVFC_AE_LINKDOWN;
 690	wake_up(&vhost->work_wait_q);
 691	LEAVE;
 692}
 693
 694/**
 695 * ibmvfc_init_host - Start host initialization
 696 * @vhost:		ibmvfc host struct
 697 *
 698 * Return value:
 699 *	nothing
 700 **/
 701static void ibmvfc_init_host(struct ibmvfc_host *vhost)
 702{
 703	struct ibmvfc_target *tgt;
 704
 705	if (vhost->action == IBMVFC_HOST_ACTION_INIT_WAIT) {
 706		if (++vhost->init_retries > IBMVFC_MAX_HOST_INIT_RETRIES) {
 707			dev_err(vhost->dev,
 708				"Host initialization retries exceeded. Taking adapter offline\n");
 709			ibmvfc_link_down(vhost, IBMVFC_HOST_OFFLINE);
 710			return;
 711		}
 712	}
 713
 714	if (!ibmvfc_set_host_state(vhost, IBMVFC_INITIALIZING)) {
 715		memset(vhost->async_crq.msgs.async, 0, PAGE_SIZE);
 716		vhost->async_crq.cur = 0;
 717
 718		list_for_each_entry(tgt, &vhost->targets, queue) {
 719			if (vhost->client_migrated)
 720				tgt->need_login = 1;
 721			else
 722				ibmvfc_del_tgt(tgt);
 723		}
 724
 725		scsi_block_requests(vhost->host);
 726		ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_INIT);
 727		vhost->job_step = ibmvfc_npiv_login;
 728		wake_up(&vhost->work_wait_q);
 729	}
 730}
 731
 732/**
 733 * ibmvfc_send_crq - Send a CRQ
 734 * @vhost:	ibmvfc host struct
 735 * @word1:	the first 64 bits of the data
 736 * @word2:	the second 64 bits of the data
 737 *
 738 * Return value:
 739 *	0 on success / other on failure
 740 **/
 741static int ibmvfc_send_crq(struct ibmvfc_host *vhost, u64 word1, u64 word2)
 742{
 743	struct vio_dev *vdev = to_vio_dev(vhost->dev);
 744	return plpar_hcall_norets(H_SEND_CRQ, vdev->unit_address, word1, word2);
 745}
 746
 747static int ibmvfc_send_sub_crq(struct ibmvfc_host *vhost, u64 cookie, u64 word1,
 748			       u64 word2, u64 word3, u64 word4)
 749{
 750	struct vio_dev *vdev = to_vio_dev(vhost->dev);
 751
 752	return plpar_hcall_norets(H_SEND_SUB_CRQ, vdev->unit_address, cookie,
 753				  word1, word2, word3, word4);
 754}
 755
 756/**
 757 * ibmvfc_send_crq_init - Send a CRQ init message
 758 * @vhost:	ibmvfc host struct
 759 *
 760 * Return value:
 761 *	0 on success / other on failure
 762 **/
 763static int ibmvfc_send_crq_init(struct ibmvfc_host *vhost)
 764{
 765	ibmvfc_dbg(vhost, "Sending CRQ init\n");
 766	return ibmvfc_send_crq(vhost, 0xC001000000000000LL, 0);
 767}
 768
 769/**
 770 * ibmvfc_send_crq_init_complete - Send a CRQ init complete message
 771 * @vhost:	ibmvfc host struct
 772 *
 773 * Return value:
 774 *	0 on success / other on failure
 775 **/
 776static int ibmvfc_send_crq_init_complete(struct ibmvfc_host *vhost)
 777{
 778	ibmvfc_dbg(vhost, "Sending CRQ init complete\n");
 779	return ibmvfc_send_crq(vhost, 0xC002000000000000LL, 0);
 780}
 781
 782/**
 783 * ibmvfc_init_event_pool - Allocates and initializes the event pool for a host
 784 * @vhost:	ibmvfc host who owns the event pool
 785 * @queue:      ibmvfc queue struct
 786 *
 787 * Returns zero on success.
 788 **/
 789static int ibmvfc_init_event_pool(struct ibmvfc_host *vhost,
 790				  struct ibmvfc_queue *queue)
 791{
 792	int i;
 793	struct ibmvfc_event_pool *pool = &queue->evt_pool;
 794
 795	ENTER;
 796	if (!queue->total_depth)
 797		return 0;
 798
 799	pool->size = queue->total_depth;
 800	pool->events = kcalloc(pool->size, sizeof(*pool->events), GFP_KERNEL);
 801	if (!pool->events)
 802		return -ENOMEM;
 803
 804	pool->iu_storage = dma_alloc_coherent(vhost->dev,
 805					      pool->size * sizeof(*pool->iu_storage),
 806					      &pool->iu_token, 0);
 807
 808	if (!pool->iu_storage) {
 809		kfree(pool->events);
 810		return -ENOMEM;
 811	}
 812
 813	INIT_LIST_HEAD(&queue->sent);
 814	INIT_LIST_HEAD(&queue->free);
 815	queue->evt_free = queue->evt_depth;
 816	queue->reserved_free = queue->reserved_depth;
 817	spin_lock_init(&queue->l_lock);
 818
 819	for (i = 0; i < pool->size; ++i) {
 820		struct ibmvfc_event *evt = &pool->events[i];
 821
 822		/*
 823		 * evt->active states
 824		 *  1 = in flight
 825		 *  0 = being completed
 826		 * -1 = free/freed
 827		 */
 828		atomic_set(&evt->active, -1);
 829		atomic_set(&evt->free, 1);
 830		evt->crq.valid = 0x80;
 831		evt->crq.ioba = cpu_to_be64(pool->iu_token + (sizeof(*evt->xfer_iu) * i));
 832		evt->xfer_iu = pool->iu_storage + i;
 833		evt->vhost = vhost;
 834		evt->queue = queue;
 835		evt->ext_list = NULL;
 836		list_add_tail(&evt->queue_list, &queue->free);
 837	}
 838
 839	LEAVE;
 840	return 0;
 841}
 842
 843/**
 844 * ibmvfc_free_event_pool - Frees memory of the event pool of a host
 845 * @vhost:	ibmvfc host who owns the event pool
 846 * @queue:      ibmvfc queue struct
 847 *
 848 **/
 849static void ibmvfc_free_event_pool(struct ibmvfc_host *vhost,
 850				   struct ibmvfc_queue *queue)
 851{
 852	int i;
 853	struct ibmvfc_event_pool *pool = &queue->evt_pool;
 854
 855	ENTER;
 856	for (i = 0; i < pool->size; ++i) {
 857		list_del(&pool->events[i].queue_list);
 858		BUG_ON(atomic_read(&pool->events[i].free) != 1);
 859		if (pool->events[i].ext_list)
 860			dma_pool_free(vhost->sg_pool,
 861				      pool->events[i].ext_list,
 862				      pool->events[i].ext_list_token);
 863	}
 864
 865	kfree(pool->events);
 866	dma_free_coherent(vhost->dev,
 867			  pool->size * sizeof(*pool->iu_storage),
 868			  pool->iu_storage, pool->iu_token);
 869	LEAVE;
 870}
 871
 872/**
 873 * ibmvfc_free_queue - Deallocate queue
 874 * @vhost:	ibmvfc host struct
 875 * @queue:	ibmvfc queue struct
 876 *
 877 * Unmaps dma and deallocates page for messages
 878 **/
 879static void ibmvfc_free_queue(struct ibmvfc_host *vhost,
 880			      struct ibmvfc_queue *queue)
 881{
 882	struct device *dev = vhost->dev;
 883
 884	dma_unmap_single(dev, queue->msg_token, PAGE_SIZE, DMA_BIDIRECTIONAL);
 885	free_page((unsigned long)queue->msgs.handle);
 886	queue->msgs.handle = NULL;
 887
 888	ibmvfc_free_event_pool(vhost, queue);
 889}
 890
 891/**
 892 * ibmvfc_release_crq_queue - Deallocates data and unregisters CRQ
 893 * @vhost:	ibmvfc host struct
 894 *
 895 * Frees irq, deallocates a page for messages, unmaps dma, and unregisters
 896 * the crq with the hypervisor.
 897 **/
 898static void ibmvfc_release_crq_queue(struct ibmvfc_host *vhost)
 899{
 900	long rc = 0;
 901	struct vio_dev *vdev = to_vio_dev(vhost->dev);
 902	struct ibmvfc_queue *crq = &vhost->crq;
 903
 904	ibmvfc_dbg(vhost, "Releasing CRQ\n");
 905	free_irq(vdev->irq, vhost);
 906	tasklet_kill(&vhost->tasklet);
 907	do {
 908		if (rc)
 909			msleep(100);
 910		rc = plpar_hcall_norets(H_FREE_CRQ, vdev->unit_address);
 911	} while (rc == H_BUSY || H_IS_LONG_BUSY(rc));
 912
 913	vhost->state = IBMVFC_NO_CRQ;
 914	vhost->logged_in = 0;
 915
 916	ibmvfc_free_queue(vhost, crq);
 917}
 918
 919/**
 920 * ibmvfc_reenable_crq_queue - reenables the CRQ
 921 * @vhost:	ibmvfc host struct
 922 *
 923 * Return value:
 924 *	0 on success / other on failure
 925 **/
 926static int ibmvfc_reenable_crq_queue(struct ibmvfc_host *vhost)
 927{
 928	int rc = 0;
 929	struct vio_dev *vdev = to_vio_dev(vhost->dev);
 930	unsigned long flags;
 931
 932	ibmvfc_dereg_sub_crqs(vhost, &vhost->scsi_scrqs);
 933
 934	/* Re-enable the CRQ */
 935	do {
 936		if (rc)
 937			msleep(100);
 938		rc = plpar_hcall_norets(H_ENABLE_CRQ, vdev->unit_address);
 939	} while (rc == H_IN_PROGRESS || rc == H_BUSY || H_IS_LONG_BUSY(rc));
 940
 941	if (rc)
 942		dev_err(vhost->dev, "Error enabling adapter (rc=%d)\n", rc);
 943
 944	spin_lock_irqsave(vhost->host->host_lock, flags);
 945	spin_lock(vhost->crq.q_lock);
 946	vhost->do_enquiry = 1;
 947	vhost->using_channels = 0;
 948	spin_unlock(vhost->crq.q_lock);
 949	spin_unlock_irqrestore(vhost->host->host_lock, flags);
 950
 951	ibmvfc_reg_sub_crqs(vhost, &vhost->scsi_scrqs);
 952
 953	return rc;
 954}
 955
 956/**
 957 * ibmvfc_reset_crq - resets a crq after a failure
 958 * @vhost:	ibmvfc host struct
 959 *
 960 * Return value:
 961 *	0 on success / other on failure
 962 **/
 963static int ibmvfc_reset_crq(struct ibmvfc_host *vhost)
 964{
 965	int rc = 0;
 966	unsigned long flags;
 967	struct vio_dev *vdev = to_vio_dev(vhost->dev);
 968	struct ibmvfc_queue *crq = &vhost->crq;
 969
 970	ibmvfc_dereg_sub_crqs(vhost, &vhost->scsi_scrqs);
 971
 972	/* Close the CRQ */
 973	do {
 974		if (rc)
 975			msleep(100);
 976		rc = plpar_hcall_norets(H_FREE_CRQ, vdev->unit_address);
 977	} while (rc == H_BUSY || H_IS_LONG_BUSY(rc));
 978
 979	spin_lock_irqsave(vhost->host->host_lock, flags);
 980	spin_lock(vhost->crq.q_lock);
 981	vhost->state = IBMVFC_NO_CRQ;
 982	vhost->logged_in = 0;
 983	vhost->do_enquiry = 1;
 984	vhost->using_channels = 0;
 985
 986	/* Clean out the queue */
 987	memset(crq->msgs.crq, 0, PAGE_SIZE);
 988	crq->cur = 0;
 989
 990	/* And re-open it again */
 991	rc = plpar_hcall_norets(H_REG_CRQ, vdev->unit_address,
 992				crq->msg_token, PAGE_SIZE);
 993
 994	if (rc == H_CLOSED)
 995		/* Adapter is good, but other end is not ready */
 996		dev_warn(vhost->dev, "Partner adapter not ready\n");
 997	else if (rc != 0)
 998		dev_warn(vhost->dev, "Couldn't register crq (rc=%d)\n", rc);
 999
1000	spin_unlock(vhost->crq.q_lock);
1001	spin_unlock_irqrestore(vhost->host->host_lock, flags);
1002
1003	ibmvfc_reg_sub_crqs(vhost, &vhost->scsi_scrqs);
1004
1005	return rc;
1006}
1007
1008/**
1009 * ibmvfc_valid_event - Determines if event is valid.
1010 * @pool:	event_pool that contains the event
1011 * @evt:	ibmvfc event to be checked for validity
1012 *
1013 * Return value:
1014 *	1 if event is valid / 0 if event is not valid
1015 **/
1016static int ibmvfc_valid_event(struct ibmvfc_event_pool *pool,
1017			      struct ibmvfc_event *evt)
1018{
1019	int index = evt - pool->events;
1020	if (index < 0 || index >= pool->size)	/* outside of bounds */
1021		return 0;
1022	if (evt != pool->events + index)	/* unaligned */
1023		return 0;
1024	return 1;
1025}
1026
1027/**
1028 * ibmvfc_free_event - Free the specified event
1029 * @evt:	ibmvfc_event to be freed
1030 *
1031 **/
1032static void ibmvfc_free_event(struct ibmvfc_event *evt)
1033{
1034	struct ibmvfc_event_pool *pool = &evt->queue->evt_pool;
1035	unsigned long flags;
1036
1037	BUG_ON(!ibmvfc_valid_event(pool, evt));
1038	BUG_ON(atomic_inc_return(&evt->free) != 1);
1039	BUG_ON(atomic_dec_and_test(&evt->active));
1040
1041	spin_lock_irqsave(&evt->queue->l_lock, flags);
1042	list_add_tail(&evt->queue_list, &evt->queue->free);
1043	if (evt->reserved) {
1044		evt->reserved = 0;
1045		evt->queue->reserved_free++;
1046	} else {
1047		evt->queue->evt_free++;
1048	}
1049	if (evt->eh_comp)
1050		complete(evt->eh_comp);
1051	spin_unlock_irqrestore(&evt->queue->l_lock, flags);
1052}
1053
1054/**
1055 * ibmvfc_scsi_eh_done - EH done function for queuecommand commands
1056 * @evt:	ibmvfc event struct
1057 *
1058 * This function does not setup any error status, that must be done
1059 * before this function gets called.
1060 **/
1061static void ibmvfc_scsi_eh_done(struct ibmvfc_event *evt)
1062{
1063	struct scsi_cmnd *cmnd = evt->cmnd;
1064
1065	if (cmnd) {
1066		scsi_dma_unmap(cmnd);
1067		scsi_done(cmnd);
1068	}
1069
1070	ibmvfc_free_event(evt);
1071}
1072
1073/**
1074 * ibmvfc_complete_purge - Complete failed command list
1075 * @purge_list:		list head of failed commands
1076 *
1077 * This function runs completions on commands to fail as a result of a
1078 * host reset or platform migration.
1079 **/
1080static void ibmvfc_complete_purge(struct list_head *purge_list)
1081{
1082	struct ibmvfc_event *evt, *pos;
1083
1084	list_for_each_entry_safe(evt, pos, purge_list, queue_list) {
1085		list_del(&evt->queue_list);
1086		ibmvfc_trc_end(evt);
1087		evt->done(evt);
1088	}
1089}
1090
1091/**
1092 * ibmvfc_fail_request - Fail request with specified error code
1093 * @evt:		ibmvfc event struct
1094 * @error_code:	error code to fail request with
1095 *
1096 * Return value:
1097 *	none
1098 **/
1099static void ibmvfc_fail_request(struct ibmvfc_event *evt, int error_code)
1100{
1101	/*
1102	 * Anything we are failing should still be active. Otherwise, it
1103	 * implies we already got a response for the command and are doing
1104	 * something bad like double completing it.
1105	 */
1106	BUG_ON(!atomic_dec_and_test(&evt->active));
1107	if (evt->cmnd) {
1108		evt->cmnd->result = (error_code << 16);
1109		evt->done = ibmvfc_scsi_eh_done;
1110	} else
1111		evt->xfer_iu->mad_common.status = cpu_to_be16(IBMVFC_MAD_DRIVER_FAILED);
1112
1113	timer_delete(&evt->timer);
1114}
1115
1116/**
1117 * ibmvfc_purge_requests - Our virtual adapter just shut down. Purge any sent requests
1118 * @vhost:		ibmvfc host struct
1119 * @error_code:	error code to fail requests with
1120 *
1121 * Return value:
1122 *	none
1123 **/
1124static void ibmvfc_purge_requests(struct ibmvfc_host *vhost, int error_code)
1125{
1126	struct ibmvfc_event *evt, *pos;
1127	struct ibmvfc_queue *queues = vhost->scsi_scrqs.scrqs;
1128	unsigned long flags;
1129	int hwqs = 0;
1130	int i;
1131
1132	if (vhost->using_channels)
1133		hwqs = vhost->scsi_scrqs.active_queues;
1134
1135	ibmvfc_dbg(vhost, "Purging all requests\n");
1136	spin_lock_irqsave(&vhost->crq.l_lock, flags);
1137	list_for_each_entry_safe(evt, pos, &vhost->crq.sent, queue_list)
1138		ibmvfc_fail_request(evt, error_code);
1139	list_splice_init(&vhost->crq.sent, &vhost->purge);
1140	spin_unlock_irqrestore(&vhost->crq.l_lock, flags);
1141
1142	for (i = 0; i < hwqs; i++) {
1143		spin_lock_irqsave(queues[i].q_lock, flags);
1144		spin_lock(&queues[i].l_lock);
1145		list_for_each_entry_safe(evt, pos, &queues[i].sent, queue_list)
1146			ibmvfc_fail_request(evt, error_code);
1147		list_splice_init(&queues[i].sent, &vhost->purge);
1148		spin_unlock(&queues[i].l_lock);
1149		spin_unlock_irqrestore(queues[i].q_lock, flags);
1150	}
1151}
1152
1153/**
1154 * ibmvfc_hard_reset_host - Reset the connection to the server by breaking the CRQ
1155 * @vhost:	struct ibmvfc host to reset
1156 **/
1157static void ibmvfc_hard_reset_host(struct ibmvfc_host *vhost)
1158{
1159	ibmvfc_purge_requests(vhost, DID_ERROR);
1160	ibmvfc_link_down(vhost, IBMVFC_LINK_DOWN);
1161	ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_RESET);
1162}
1163
1164/**
1165 * __ibmvfc_reset_host - Reset the connection to the server (no locking)
1166 * @vhost:	struct ibmvfc host to reset
1167 **/
1168static void __ibmvfc_reset_host(struct ibmvfc_host *vhost)
1169{
1170	if (vhost->logged_in && vhost->action != IBMVFC_HOST_ACTION_LOGO_WAIT &&
1171	    !ibmvfc_set_host_state(vhost, IBMVFC_INITIALIZING)) {
1172		scsi_block_requests(vhost->host);
1173		ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_LOGO);
1174		vhost->job_step = ibmvfc_npiv_logout;
1175		wake_up(&vhost->work_wait_q);
1176	} else
1177		ibmvfc_hard_reset_host(vhost);
1178}
1179
1180/**
1181 * ibmvfc_reset_host - Reset the connection to the server
1182 * @vhost:	ibmvfc host struct
1183 **/
1184static void ibmvfc_reset_host(struct ibmvfc_host *vhost)
1185{
1186	unsigned long flags;
1187
1188	spin_lock_irqsave(vhost->host->host_lock, flags);
1189	__ibmvfc_reset_host(vhost);
1190	spin_unlock_irqrestore(vhost->host->host_lock, flags);
1191}
1192
1193/**
1194 * ibmvfc_retry_host_init - Retry host initialization if allowed
1195 * @vhost:	ibmvfc host struct
1196 *
1197 * Returns: 1 if init will be retried / 0 if not
1198 *
1199 **/
1200static int ibmvfc_retry_host_init(struct ibmvfc_host *vhost)
1201{
1202	int retry = 0;
1203
1204	if (vhost->action == IBMVFC_HOST_ACTION_INIT_WAIT) {
1205		vhost->delay_init = 1;
1206		if (++vhost->init_retries > IBMVFC_MAX_HOST_INIT_RETRIES) {
1207			dev_err(vhost->dev,
1208				"Host initialization retries exceeded. Taking adapter offline\n");
1209			ibmvfc_link_down(vhost, IBMVFC_HOST_OFFLINE);
1210		} else if (vhost->init_retries == IBMVFC_MAX_HOST_INIT_RETRIES)
1211			__ibmvfc_reset_host(vhost);
1212		else {
1213			ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_INIT);
1214			retry = 1;
1215		}
1216	}
1217
1218	wake_up(&vhost->work_wait_q);
1219	return retry;
1220}
1221
1222/**
1223 * __ibmvfc_get_target - Find the specified scsi_target (no locking)
1224 * @starget:	scsi target struct
1225 *
1226 * Return value:
1227 *	ibmvfc_target struct / NULL if not found
1228 **/
1229static struct ibmvfc_target *__ibmvfc_get_target(struct scsi_target *starget)
1230{
1231	struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
1232	struct ibmvfc_host *vhost = shost_priv(shost);
1233	struct ibmvfc_target *tgt;
1234
1235	list_for_each_entry(tgt, &vhost->targets, queue)
1236		if (tgt->target_id == starget->id) {
1237			kref_get(&tgt->kref);
1238			return tgt;
1239		}
1240	return NULL;
1241}
1242
1243/**
1244 * ibmvfc_get_target - Find the specified scsi_target
1245 * @starget:	scsi target struct
1246 *
1247 * Return value:
1248 *	ibmvfc_target struct / NULL if not found
1249 **/
1250static struct ibmvfc_target *ibmvfc_get_target(struct scsi_target *starget)
1251{
1252	struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
1253	struct ibmvfc_target *tgt;
1254	unsigned long flags;
1255
1256	spin_lock_irqsave(shost->host_lock, flags);
1257	tgt = __ibmvfc_get_target(starget);
1258	spin_unlock_irqrestore(shost->host_lock, flags);
1259	return tgt;
1260}
1261
1262/**
1263 * ibmvfc_get_host_speed - Get host port speed
1264 * @shost:		scsi host struct
1265 *
1266 * Return value:
1267 * 	none
1268 **/
1269static void ibmvfc_get_host_speed(struct Scsi_Host *shost)
1270{
1271	struct ibmvfc_host *vhost = shost_priv(shost);
1272	unsigned long flags;
1273
1274	spin_lock_irqsave(shost->host_lock, flags);
1275	if (vhost->state == IBMVFC_ACTIVE) {
1276		switch (be64_to_cpu(vhost->login_buf->resp.link_speed) / 100) {
1277		case 1:
1278			fc_host_speed(shost) = FC_PORTSPEED_1GBIT;
1279			break;
1280		case 2:
1281			fc_host_speed(shost) = FC_PORTSPEED_2GBIT;
1282			break;
1283		case 4:
1284			fc_host_speed(shost) = FC_PORTSPEED_4GBIT;
1285			break;
1286		case 8:
1287			fc_host_speed(shost) = FC_PORTSPEED_8GBIT;
1288			break;
1289		case 10:
1290			fc_host_speed(shost) = FC_PORTSPEED_10GBIT;
1291			break;
1292		case 16:
1293			fc_host_speed(shost) = FC_PORTSPEED_16GBIT;
1294			break;
1295		default:
1296			ibmvfc_log(vhost, 3, "Unknown port speed: %lld Gbit\n",
1297				   be64_to_cpu(vhost->login_buf->resp.link_speed) / 100);
1298			fc_host_speed(shost) = FC_PORTSPEED_UNKNOWN;
1299			break;
1300		}
1301	} else
1302		fc_host_speed(shost) = FC_PORTSPEED_UNKNOWN;
1303	spin_unlock_irqrestore(shost->host_lock, flags);
1304}
1305
1306/**
1307 * ibmvfc_get_host_port_state - Get host port state
1308 * @shost:		scsi host struct
1309 *
1310 * Return value:
1311 * 	none
1312 **/
1313static void ibmvfc_get_host_port_state(struct Scsi_Host *shost)
1314{
1315	struct ibmvfc_host *vhost = shost_priv(shost);
1316	unsigned long flags;
1317
1318	spin_lock_irqsave(shost->host_lock, flags);
1319	switch (vhost->state) {
1320	case IBMVFC_INITIALIZING:
1321	case IBMVFC_ACTIVE:
1322		fc_host_port_state(shost) = FC_PORTSTATE_ONLINE;
1323		break;
1324	case IBMVFC_LINK_DOWN:
1325		fc_host_port_state(shost) = FC_PORTSTATE_LINKDOWN;
1326		break;
1327	case IBMVFC_LINK_DEAD:
1328	case IBMVFC_HOST_OFFLINE:
1329		fc_host_port_state(shost) = FC_PORTSTATE_OFFLINE;
1330		break;
1331	case IBMVFC_HALTED:
1332		fc_host_port_state(shost) = FC_PORTSTATE_BLOCKED;
1333		break;
1334	case IBMVFC_NO_CRQ:
1335		fc_host_port_state(shost) = FC_PORTSTATE_UNKNOWN;
1336		break;
1337	default:
1338		ibmvfc_log(vhost, 3, "Unknown port state: %d\n", vhost->state);
1339		fc_host_port_state(shost) = FC_PORTSTATE_UNKNOWN;
1340		break;
1341	}
1342	spin_unlock_irqrestore(shost->host_lock, flags);
1343}
1344
1345/**
1346 * ibmvfc_set_rport_dev_loss_tmo - Set rport's device loss timeout
1347 * @rport:		rport struct
1348 * @timeout:	timeout value
1349 *
1350 * Return value:
1351 * 	none
1352 **/
1353static void ibmvfc_set_rport_dev_loss_tmo(struct fc_rport *rport, u32 timeout)
1354{
1355	if (timeout)
1356		rport->dev_loss_tmo = timeout;
1357	else
1358		rport->dev_loss_tmo = 1;
1359}
1360
1361/**
1362 * ibmvfc_release_tgt - Free memory allocated for a target
1363 * @kref:		kref struct
1364 *
1365 **/
1366static void ibmvfc_release_tgt(struct kref *kref)
1367{
1368	struct ibmvfc_target *tgt = container_of(kref, struct ibmvfc_target, kref);
1369	kfree(tgt);
1370}
1371
1372/**
1373 * ibmvfc_get_starget_node_name - Get SCSI target's node name
1374 * @starget:	scsi target struct
1375 *
1376 * Return value:
1377 * 	none
1378 **/
1379static void ibmvfc_get_starget_node_name(struct scsi_target *starget)
1380{
1381	struct ibmvfc_target *tgt = ibmvfc_get_target(starget);
1382	fc_starget_port_name(starget) = tgt ? tgt->ids.node_name : 0;
1383	if (tgt)
1384		kref_put(&tgt->kref, ibmvfc_release_tgt);
1385}
1386
1387/**
1388 * ibmvfc_get_starget_port_name - Get SCSI target's port name
1389 * @starget:	scsi target struct
1390 *
1391 * Return value:
1392 * 	none
1393 **/
1394static void ibmvfc_get_starget_port_name(struct scsi_target *starget)
1395{
1396	struct ibmvfc_target *tgt = ibmvfc_get_target(starget);
1397	fc_starget_port_name(starget) = tgt ? tgt->ids.port_name : 0;
1398	if (tgt)
1399		kref_put(&tgt->kref, ibmvfc_release_tgt);
1400}
1401
1402/**
1403 * ibmvfc_get_starget_port_id - Get SCSI target's port ID
1404 * @starget:	scsi target struct
1405 *
1406 * Return value:
1407 * 	none
1408 **/
1409static void ibmvfc_get_starget_port_id(struct scsi_target *starget)
1410{
1411	struct ibmvfc_target *tgt = ibmvfc_get_target(starget);
1412	fc_starget_port_id(starget) = tgt ? tgt->scsi_id : -1;
1413	if (tgt)
1414		kref_put(&tgt->kref, ibmvfc_release_tgt);
1415}
1416
1417/**
1418 * ibmvfc_wait_while_resetting - Wait while the host resets
1419 * @vhost:		ibmvfc host struct
1420 *
1421 * Return value:
1422 * 	0 on success / other on failure
1423 **/
1424static int ibmvfc_wait_while_resetting(struct ibmvfc_host *vhost)
1425{
1426	long timeout = wait_event_timeout(vhost->init_wait_q,
1427					  ((vhost->state == IBMVFC_ACTIVE ||
1428					    vhost->state == IBMVFC_HOST_OFFLINE ||
1429					    vhost->state == IBMVFC_LINK_DEAD) &&
1430					   vhost->action == IBMVFC_HOST_ACTION_NONE),
1431					  (init_timeout * HZ));
1432
1433	return timeout ? 0 : -EIO;
1434}
1435
1436/**
1437 * ibmvfc_issue_fc_host_lip - Re-initiate link initialization
1438 * @shost:		scsi host struct
1439 *
1440 * Return value:
1441 * 	0 on success / other on failure
1442 **/
1443static int ibmvfc_issue_fc_host_lip(struct Scsi_Host *shost)
1444{
1445	struct ibmvfc_host *vhost = shost_priv(shost);
1446
1447	dev_err(vhost->dev, "Initiating host LIP. Resetting connection\n");
1448	ibmvfc_reset_host(vhost);
1449	return ibmvfc_wait_while_resetting(vhost);
1450}
1451
1452/**
1453 * ibmvfc_gather_partition_info - Gather info about the LPAR
1454 * @vhost:      ibmvfc host struct
1455 *
1456 * Return value:
1457 *	none
1458 **/
1459static void ibmvfc_gather_partition_info(struct ibmvfc_host *vhost)
1460{
1461	struct device_node *rootdn;
1462	const char *name;
1463	const unsigned int *num;
1464
1465	rootdn = of_find_node_by_path("/");
1466	if (!rootdn)
1467		return;
1468
1469	name = of_get_property(rootdn, "ibm,partition-name", NULL);
1470	if (name)
1471		strscpy(vhost->partition_name, name, sizeof(vhost->partition_name));
1472	num = of_get_property(rootdn, "ibm,partition-no", NULL);
1473	if (num)
1474		vhost->partition_number = *num;
1475	of_node_put(rootdn);
1476}
1477
1478/**
1479 * ibmvfc_set_login_info - Setup info for NPIV login
1480 * @vhost:	ibmvfc host struct
1481 *
1482 * Return value:
1483 *	none
1484 **/
1485static void ibmvfc_set_login_info(struct ibmvfc_host *vhost)
1486{
1487	struct ibmvfc_npiv_login *login_info = &vhost->login_info;
1488	struct ibmvfc_queue *async_crq = &vhost->async_crq;
1489	struct device_node *of_node = vhost->dev->of_node;
1490	const char *location;
1491	u16 max_cmds;
1492
1493	max_cmds = scsi_qdepth + IBMVFC_NUM_INTERNAL_REQ;
1494	if (mq_enabled)
1495		max_cmds += (scsi_qdepth + IBMVFC_NUM_INTERNAL_SUBQ_REQ) *
1496			vhost->scsi_scrqs.desired_queues;
1497
1498	memset(login_info, 0, sizeof(*login_info));
1499
1500	login_info->ostype = cpu_to_be32(IBMVFC_OS_LINUX);
1501	login_info->max_dma_len = cpu_to_be64(max_sectors << 9);
1502	login_info->max_payload = cpu_to_be32(sizeof(struct ibmvfc_fcp_cmd_iu));
1503	login_info->max_response = cpu_to_be32(sizeof(struct ibmvfc_fcp_rsp));
1504	login_info->partition_num = cpu_to_be32(vhost->partition_number);
1505	login_info->vfc_frame_version = cpu_to_be32(1);
1506	login_info->fcp_version = cpu_to_be16(3);
1507	login_info->flags = cpu_to_be16(IBMVFC_FLUSH_ON_HALT);
1508	if (vhost->client_migrated)
1509		login_info->flags |= cpu_to_be16(IBMVFC_CLIENT_MIGRATED);
1510
1511	login_info->max_cmds = cpu_to_be32(max_cmds);
1512	login_info->capabilities = cpu_to_be64(IBMVFC_CAN_MIGRATE | IBMVFC_CAN_SEND_VF_WWPN);
1513
1514	if (vhost->mq_enabled || vhost->using_channels)
1515		login_info->capabilities |= cpu_to_be64(IBMVFC_CAN_USE_CHANNELS);
1516
1517	login_info->async.va = cpu_to_be64(vhost->async_crq.msg_token);
1518	login_info->async.len = cpu_to_be32(async_crq->size *
1519					    sizeof(*async_crq->msgs.async));
1520	strscpy(login_info->partition_name, vhost->partition_name,
1521		sizeof(login_info->partition_name));
1522
1523	strscpy(login_info->device_name,
1524		dev_name(&vhost->host->shost_gendev), sizeof(login_info->device_name));
1525
1526	location = of_get_property(of_node, "ibm,loc-code", NULL);
1527	location = location ? location : dev_name(vhost->dev);
1528	strscpy(login_info->drc_name, location, sizeof(login_info->drc_name));
1529}
1530
1531/**
1532 * __ibmvfc_get_event - Gets the next free event in pool
1533 * @queue:      ibmvfc queue struct
1534 * @reserved:	event is for a reserved management command
1535 *
1536 * Returns a free event from the pool.
1537 **/
1538static struct ibmvfc_event *__ibmvfc_get_event(struct ibmvfc_queue *queue, int reserved)
1539{
1540	struct ibmvfc_event *evt = NULL;
1541	unsigned long flags;
1542
1543	spin_lock_irqsave(&queue->l_lock, flags);
1544	if (reserved && queue->reserved_free) {
1545		evt = list_entry(queue->free.next, struct ibmvfc_event, queue_list);
1546		evt->reserved = 1;
1547		queue->reserved_free--;
1548	} else if (queue->evt_free) {
1549		evt = list_entry(queue->free.next, struct ibmvfc_event, queue_list);
1550		queue->evt_free--;
1551	} else {
1552		goto out;
1553	}
1554
1555	atomic_set(&evt->free, 0);
1556	list_del(&evt->queue_list);
1557out:
1558	spin_unlock_irqrestore(&queue->l_lock, flags);
1559	return evt;
1560}
1561
1562#define ibmvfc_get_event(queue) __ibmvfc_get_event(queue, 0)
1563#define ibmvfc_get_reserved_event(queue) __ibmvfc_get_event(queue, 1)
1564
1565/**
1566 * ibmvfc_locked_done - Calls evt completion with host_lock held
1567 * @evt:	ibmvfc evt to complete
1568 *
1569 * All non-scsi command completion callbacks have the expectation that the
1570 * host_lock is held. This callback is used by ibmvfc_init_event to wrap a
1571 * MAD evt with the host_lock.
1572 **/
1573static void ibmvfc_locked_done(struct ibmvfc_event *evt)
1574{
1575	unsigned long flags;
1576
1577	spin_lock_irqsave(evt->vhost->host->host_lock, flags);
1578	evt->_done(evt);
1579	spin_unlock_irqrestore(evt->vhost->host->host_lock, flags);
1580}
1581
1582/**
1583 * ibmvfc_init_event - Initialize fields in an event struct that are always
1584 *				required.
1585 * @evt:	The event
1586 * @done:	Routine to call when the event is responded to
1587 * @format:	SRP or MAD format
1588 **/
1589static void ibmvfc_init_event(struct ibmvfc_event *evt,
1590			      void (*done) (struct ibmvfc_event *), u8 format)
1591{
1592	evt->cmnd = NULL;
1593	evt->sync_iu = NULL;
1594	evt->eh_comp = NULL;
1595	evt->crq.format = format;
1596	if (format == IBMVFC_CMD_FORMAT)
1597		evt->done = done;
1598	else {
1599		evt->_done = done;
1600		evt->done = ibmvfc_locked_done;
1601	}
1602	evt->hwq = 0;
1603}
1604
1605/**
1606 * ibmvfc_map_sg_list - Initialize scatterlist
1607 * @scmd:	scsi command struct
1608 * @nseg:	number of scatterlist segments
1609 * @md:	memory descriptor list to initialize
1610 **/
1611static void ibmvfc_map_sg_list(struct scsi_cmnd *scmd, int nseg,
1612			       struct srp_direct_buf *md)
1613{
1614	int i;
1615	struct scatterlist *sg;
1616
1617	scsi_for_each_sg(scmd, sg, nseg, i) {
1618		md[i].va = cpu_to_be64(sg_dma_address(sg));
1619		md[i].len = cpu_to_be32(sg_dma_len(sg));
1620		md[i].key = 0;
1621	}
1622}
1623
1624/**
1625 * ibmvfc_map_sg_data - Maps dma for a scatterlist and initializes descriptor fields
1626 * @scmd:		struct scsi_cmnd with the scatterlist
1627 * @evt:		ibmvfc event struct
1628 * @vfc_cmd:	vfc_cmd that contains the memory descriptor
1629 * @dev:		device for which to map dma memory
1630 *
1631 * Returns:
1632 *	0 on success / non-zero on failure
1633 **/
1634static int ibmvfc_map_sg_data(struct scsi_cmnd *scmd,
1635			      struct ibmvfc_event *evt,
1636			      struct ibmvfc_cmd *vfc_cmd, struct device *dev)
1637{
1638
1639	int sg_mapped;
1640	struct srp_direct_buf *data = &vfc_cmd->ioba;
1641	struct ibmvfc_host *vhost = dev_get_drvdata(dev);
1642	struct ibmvfc_fcp_cmd_iu *iu = ibmvfc_get_fcp_iu(evt->vhost, vfc_cmd);
1643
1644	if (cls3_error)
1645		vfc_cmd->flags |= cpu_to_be16(IBMVFC_CLASS_3_ERR);
1646
1647	sg_mapped = scsi_dma_map(scmd);
1648	if (!sg_mapped) {
1649		vfc_cmd->flags |= cpu_to_be16(IBMVFC_NO_MEM_DESC);
1650		return 0;
1651	} else if (unlikely(sg_mapped < 0)) {
1652		if (vhost->log_level > IBMVFC_DEFAULT_LOG_LEVEL)
1653			scmd_printk(KERN_ERR, scmd, "Failed to map DMA buffer for command\n");
1654		return sg_mapped;
1655	}
1656
1657	if (scmd->sc_data_direction == DMA_TO_DEVICE) {
1658		vfc_cmd->flags |= cpu_to_be16(IBMVFC_WRITE);
1659		iu->add_cdb_len |= IBMVFC_WRDATA;
1660	} else {
1661		vfc_cmd->flags |= cpu_to_be16(IBMVFC_READ);
1662		iu->add_cdb_len |= IBMVFC_RDDATA;
1663	}
1664
1665	if (sg_mapped == 1) {
1666		ibmvfc_map_sg_list(scmd, sg_mapped, data);
1667		return 0;
1668	}
1669
1670	vfc_cmd->flags |= cpu_to_be16(IBMVFC_SCATTERLIST);
1671
1672	if (!evt->ext_list) {
1673		evt->ext_list = dma_pool_alloc(vhost->sg_pool, GFP_ATOMIC,
1674					       &evt->ext_list_token);
1675
1676		if (!evt->ext_list) {
1677			scsi_dma_unmap(scmd);
1678			if (vhost->log_level > IBMVFC_DEFAULT_LOG_LEVEL)
1679				scmd_printk(KERN_ERR, scmd, "Can't allocate memory for scatterlist\n");
1680			return -ENOMEM;
1681		}
1682	}
1683
1684	ibmvfc_map_sg_list(scmd, sg_mapped, evt->ext_list);
1685
1686	data->va = cpu_to_be64(evt->ext_list_token);
1687	data->len = cpu_to_be32(sg_mapped * sizeof(struct srp_direct_buf));
1688	data->key = 0;
1689	return 0;
1690}
1691
1692/**
1693 * ibmvfc_timeout - Internal command timeout handler
1694 * @t:	struct ibmvfc_event that timed out
1695 *
1696 * Called when an internally generated command times out
1697 **/
1698static void ibmvfc_timeout(struct timer_list *t)
1699{
1700	struct ibmvfc_event *evt = timer_container_of(evt, t, timer);
1701	struct ibmvfc_host *vhost = evt->vhost;
1702	dev_err(vhost->dev, "Command timed out (%p). Resetting connection\n", evt);
1703	ibmvfc_reset_host(vhost);
1704}
1705
1706/**
1707 * ibmvfc_send_event - Transforms event to u64 array and calls send_crq()
1708 * @evt:		event to be sent
1709 * @vhost:		ibmvfc host struct
1710 * @timeout:	timeout in seconds - 0 means do not time command
1711 *
1712 * Returns the value returned from ibmvfc_send_crq(). (Zero for success)
1713 **/
1714static int ibmvfc_send_event(struct ibmvfc_event *evt,
1715			     struct ibmvfc_host *vhost, unsigned long timeout)
1716{
1717	__be64 *crq_as_u64 = (__be64 *) &evt->crq;
1718	unsigned long flags;
1719	int rc;
1720
1721	/* Copy the IU into the transfer area */
1722	*evt->xfer_iu = evt->iu;
1723	if (evt->crq.format == IBMVFC_CMD_FORMAT)
1724		evt->xfer_iu->cmd.tag = cpu_to_be64((u64)evt);
1725	else if (evt->crq.format == IBMVFC_MAD_FORMAT)
1726		evt->xfer_iu->mad_common.tag = cpu_to_be64((u64)evt);
1727	else
1728		BUG();
1729
1730	timer_setup(&evt->timer, ibmvfc_timeout, 0);
1731
1732	if (timeout) {
1733		evt->timer.expires = jiffies + (timeout * HZ);
1734		add_timer(&evt->timer);
1735	}
1736
1737	spin_lock_irqsave(&evt->queue->l_lock, flags);
1738	list_add_tail(&evt->queue_list, &evt->queue->sent);
1739	atomic_set(&evt->active, 1);
1740
1741	mb();
1742
1743	if (evt->queue->fmt == IBMVFC_SUB_CRQ_FMT)
1744		rc = ibmvfc_send_sub_crq(vhost,
1745					 evt->queue->vios_cookie,
1746					 be64_to_cpu(crq_as_u64[0]),
1747					 be64_to_cpu(crq_as_u64[1]),
1748					 0, 0);
1749	else
1750		rc = ibmvfc_send_crq(vhost, be64_to_cpu(crq_as_u64[0]),
1751				     be64_to_cpu(crq_as_u64[1]));
1752
1753	if (rc) {
1754		atomic_set(&evt->active, 0);
1755		list_del(&evt->queue_list);
1756		spin_unlock_irqrestore(&evt->queue->l_lock, flags);
1757		timer_delete(&evt->timer);
1758
1759		/* If send_crq returns H_CLOSED, return SCSI_MLQUEUE_HOST_BUSY.
1760		 * Firmware will send a CRQ with a transport event (0xFF) to
1761		 * tell this client what has happened to the transport. This
1762		 * will be handled in ibmvfc_handle_crq()
1763		 */
1764		if (rc == H_CLOSED) {
1765			if (printk_ratelimit())
1766				dev_warn(vhost->dev, "Send warning. Receive queue closed, will retry.\n");
1767			if (evt->cmnd)
1768				scsi_dma_unmap(evt->cmnd);
1769			ibmvfc_free_event(evt);
1770			return SCSI_MLQUEUE_HOST_BUSY;
1771		}
1772
1773		dev_err(vhost->dev, "Send error (rc=%d)\n", rc);
1774		if (evt->cmnd) {
1775			evt->cmnd->result = DID_ERROR << 16;
1776			evt->done = ibmvfc_scsi_eh_done;
1777		} else
1778			evt->xfer_iu->mad_common.status = cpu_to_be16(IBMVFC_MAD_CRQ_ERROR);
1779
1780		evt->done(evt);
1781	} else {
1782		spin_unlock_irqrestore(&evt->queue->l_lock, flags);
1783		ibmvfc_trc_start(evt);
1784	}
1785
1786	return 0;
1787}
1788
1789/**
1790 * ibmvfc_log_error - Log an error for the failed command if appropriate
1791 * @evt:	ibmvfc event to log
1792 *
1793 **/
1794static void ibmvfc_log_error(struct ibmvfc_event *evt)
1795{
1796	struct ibmvfc_cmd *vfc_cmd = &evt->xfer_iu->cmd;
1797	struct ibmvfc_host *vhost = evt->vhost;
1798	struct ibmvfc_fcp_rsp *rsp = ibmvfc_get_fcp_rsp(vhost, vfc_cmd);
1799	struct scsi_cmnd *cmnd = evt->cmnd;
1800	const char *err = unknown_error;
1801	int index = ibmvfc_get_err_index(be16_to_cpu(vfc_cmd->status), be16_to_cpu(vfc_cmd->error));
1802	int logerr = 0;
1803	int rsp_code = 0;
1804
1805	if (index >= 0) {
1806		logerr = cmd_status[index].log;
1807		err = cmd_status[index].name;
1808	}
1809
1810	if (!logerr && (vhost->log_level <= (IBMVFC_DEFAULT_LOG_LEVEL + 1)))
1811		return;
1812
1813	if (rsp->flags & FCP_RSP_LEN_VALID)
1814		rsp_code = rsp->data.info.rsp_code;
1815
1816	scmd_printk(KERN_ERR, cmnd, "Command (%02X) : %s (%x:%x) "
1817		    "flags: %x fcp_rsp: %x, resid=%d, scsi_status: %x\n",
1818		    cmnd->cmnd[0], err, be16_to_cpu(vfc_cmd->status), be16_to_cpu(vfc_cmd->error),
1819		    rsp->flags, rsp_code, scsi_get_resid(cmnd), rsp->scsi_status);
1820}
1821
1822/**
1823 * ibmvfc_relogin - Log back into the specified device
1824 * @sdev:	scsi device struct
1825 *
1826 **/
1827static void ibmvfc_relogin(struct scsi_device *sdev)
1828{
1829	struct ibmvfc_host *vhost = shost_priv(sdev->host);
1830	struct fc_rport *rport = starget_to_rport(scsi_target(sdev));
1831	struct ibmvfc_target *tgt;
1832	unsigned long flags;
1833
1834	spin_lock_irqsave(vhost->host->host_lock, flags);
1835	list_for_each_entry(tgt, &vhost->targets, queue) {
1836		if (rport == tgt->rport) {
1837			ibmvfc_del_tgt(tgt);
1838			break;
1839		}
1840	}
1841
1842	ibmvfc_reinit_host(vhost);
1843	spin_unlock_irqrestore(vhost->host->host_lock, flags);
1844}
1845
1846/**
1847 * ibmvfc_scsi_done - Handle responses from commands
1848 * @evt:	ibmvfc event to be handled
1849 *
1850 * Used as a callback when sending scsi cmds.
1851 **/
1852static void ibmvfc_scsi_done(struct ibmvfc_event *evt)
1853{
1854	struct ibmvfc_cmd *vfc_cmd = &evt->xfer_iu->cmd;
1855	struct ibmvfc_fcp_rsp *rsp = ibmvfc_get_fcp_rsp(evt->vhost, vfc_cmd);
1856	struct scsi_cmnd *cmnd = evt->cmnd;
1857	u32 rsp_len = 0;
1858	u32 sense_len = be32_to_cpu(rsp->fcp_sense_len);
1859
1860	if (cmnd) {
1861		if (be16_to_cpu(vfc_cmd->response_flags) & IBMVFC_ADAPTER_RESID_VALID)
1862			scsi_set_resid(cmnd, be32_to_cpu(vfc_cmd->adapter_resid));
1863		else if (rsp->flags & FCP_RESID_UNDER)
1864			scsi_set_resid(cmnd, be32_to_cpu(rsp->fcp_resid));
1865		else
1866			scsi_set_resid(cmnd, 0);
1867
1868		if (vfc_cmd->status) {
1869			cmnd->result = ibmvfc_get_err_result(evt->vhost, vfc_cmd);
1870
1871			if (rsp->flags & FCP_RSP_LEN_VALID)
1872				rsp_len = be32_to_cpu(rsp->fcp_rsp_len);
1873			if ((sense_len + rsp_len) > SCSI_SENSE_BUFFERSIZE)
1874				sense_len = SCSI_SENSE_BUFFERSIZE - rsp_len;
1875			if ((rsp->flags & FCP_SNS_LEN_VALID) && rsp->fcp_sense_len && rsp_len <= 8)
1876				memcpy(cmnd->sense_buffer, rsp->data.sense + rsp_len, sense_len);
1877			if ((be16_to_cpu(vfc_cmd->status) & IBMVFC_VIOS_FAILURE) &&
1878			    (be16_to_cpu(vfc_cmd->error) == IBMVFC_PLOGI_REQUIRED))
1879				ibmvfc_relogin(cmnd->device);
1880
1881			if (!cmnd->result && (!scsi_get_resid(cmnd) || (rsp->flags & FCP_RESID_OVER)))
1882				cmnd->result = (DID_ERROR << 16);
1883
1884			ibmvfc_log_error(evt);
1885		}
1886
1887		if (!cmnd->result &&
1888		    (scsi_bufflen(cmnd) - scsi_get_resid(cmnd) < cmnd->underflow))
1889			cmnd->result = (DID_ERROR << 16);
1890
1891		scsi_dma_unmap(cmnd);
1892		scsi_done(cmnd);
1893	}
1894
1895	ibmvfc_free_event(evt);
1896}
1897
1898/**
1899 * ibmvfc_host_chkready - Check if the host can accept commands
1900 * @vhost:	 struct ibmvfc host
1901 *
1902 * Returns:
1903 *	1 if host can accept command / 0 if not
1904 **/
1905static inline int ibmvfc_host_chkready(struct ibmvfc_host *vhost)
1906{
1907	int result = 0;
1908
1909	switch (vhost->state) {
1910	case IBMVFC_LINK_DEAD:
1911	case IBMVFC_HOST_OFFLINE:
1912		result = DID_NO_CONNECT << 16;
1913		break;
1914	case IBMVFC_NO_CRQ:
1915	case IBMVFC_INITIALIZING:
1916	case IBMVFC_HALTED:
1917	case IBMVFC_LINK_DOWN:
1918		result = DID_REQUEUE << 16;
1919		break;
1920	case IBMVFC_ACTIVE:
1921		result = 0;
1922		break;
1923	}
1924
1925	return result;
1926}
1927
1928static struct ibmvfc_cmd *ibmvfc_init_vfc_cmd(struct ibmvfc_event *evt, struct scsi_device *sdev)
1929{
1930	struct fc_rport *rport = starget_to_rport(scsi_target(sdev));
1931	struct ibmvfc_host *vhost = evt->vhost;
1932	struct ibmvfc_cmd *vfc_cmd = &evt->iu.cmd;
1933	struct ibmvfc_fcp_cmd_iu *iu = ibmvfc_get_fcp_iu(vhost, vfc_cmd);
1934	struct ibmvfc_fcp_rsp *rsp = ibmvfc_get_fcp_rsp(vhost, vfc_cmd);
1935	size_t offset;
1936
1937	memset(vfc_cmd, 0, sizeof(*vfc_cmd));
1938	if (ibmvfc_check_caps(vhost, IBMVFC_HANDLE_VF_WWPN)) {
1939		offset = offsetof(struct ibmvfc_cmd, v2.rsp);
1940		vfc_cmd->target_wwpn = cpu_to_be64(rport->port_name);
1941	} else
1942		offset = offsetof(struct ibmvfc_cmd, v1.rsp);
1943	vfc_cmd->resp.va = cpu_to_be64(be64_to_cpu(evt->crq.ioba) + offset);
1944	vfc_cmd->resp.len = cpu_to_be32(sizeof(*rsp));
1945	vfc_cmd->frame_type = cpu_to_be32(IBMVFC_SCSI_FCP_TYPE);
1946	vfc_cmd->payload_len = cpu_to_be32(sizeof(*iu));
1947	vfc_cmd->resp_len = cpu_to_be32(sizeof(*rsp));
1948	vfc_cmd->cancel_key = cpu_to_be32((unsigned long)sdev->hostdata);
1949	vfc_cmd->tgt_scsi_id = cpu_to_be64(rport->port_id);
1950	int_to_scsilun(sdev->lun, &iu->lun);
1951
1952	return vfc_cmd;
1953}
1954
1955/**
1956 * ibmvfc_queuecommand - The queuecommand function of the scsi template
1957 * @shost:	scsi host struct
1958 * @cmnd:	struct scsi_cmnd to be executed
1959 *
1960 * Returns:
1961 *	0 on success / other on failure
1962 **/
1963static int ibmvfc_queuecommand(struct Scsi_Host *shost, struct scsi_cmnd *cmnd)
1964{
1965	struct ibmvfc_host *vhost = shost_priv(shost);
1966	struct fc_rport *rport = starget_to_rport(scsi_target(cmnd->device));
1967	struct ibmvfc_cmd *vfc_cmd;
1968	struct ibmvfc_fcp_cmd_iu *iu;
1969	struct ibmvfc_event *evt;
1970	u32 tag_and_hwq = blk_mq_unique_tag(scsi_cmd_to_rq(cmnd));
1971	u16 hwq = blk_mq_unique_tag_to_hwq(tag_and_hwq);
1972	u16 scsi_channel;
1973	int rc;
1974
1975	if (unlikely((rc = fc_remote_port_chkready(rport))) ||
1976	    unlikely((rc = ibmvfc_host_chkready(vhost)))) {
1977		cmnd->result = rc;
1978		scsi_done(cmnd);
1979		return 0;
1980	}
1981
1982	cmnd->result = (DID_OK << 16);
1983	if (vhost->using_channels) {
1984		scsi_channel = hwq % vhost->scsi_scrqs.active_queues;
1985		evt = ibmvfc_get_event(&vhost->scsi_scrqs.scrqs[scsi_channel]);
1986		if (!evt)
1987			return SCSI_MLQUEUE_HOST_BUSY;
1988
1989		evt->hwq = hwq % vhost->scsi_scrqs.active_queues;
1990	} else {
1991		evt = ibmvfc_get_event(&vhost->crq);
1992		if (!evt)
1993			return SCSI_MLQUEUE_HOST_BUSY;
1994	}
1995
1996	ibmvfc_init_event(evt, ibmvfc_scsi_done, IBMVFC_CMD_FORMAT);
1997	evt->cmnd = cmnd;
1998
1999	vfc_cmd = ibmvfc_init_vfc_cmd(evt, cmnd->device);
2000	iu = ibmvfc_get_fcp_iu(vhost, vfc_cmd);
2001
2002	iu->xfer_len = cpu_to_be32(scsi_bufflen(cmnd));
2003	memcpy(iu->cdb, cmnd->cmnd, cmnd->cmd_len);
2004
2005	if (cmnd->flags & SCMD_TAGGED) {
2006		vfc_cmd->task_tag = cpu_to_be64(scsi_cmd_to_rq(cmnd)->tag);
2007		iu->pri_task_attr = IBMVFC_SIMPLE_TASK;
2008	}
2009
2010	vfc_cmd->correlation = cpu_to_be64((u64)evt);
2011
2012	if (likely(!(rc = ibmvfc_map_sg_data(cmnd, evt, vfc_cmd, vhost->dev))))
2013		return ibmvfc_send_event(evt, vhost, 0);
2014
2015	ibmvfc_free_event(evt);
2016	if (rc == -ENOMEM)
2017		return SCSI_MLQUEUE_HOST_BUSY;
2018
2019	if (vhost->log_level > IBMVFC_DEFAULT_LOG_LEVEL)
2020		scmd_printk(KERN_ERR, cmnd,
2021			    "Failed to map DMA buffer for command. rc=%d\n", rc);
2022
2023	cmnd->result = DID_ERROR << 16;
2024	scsi_done(cmnd);
2025	return 0;
2026}
2027
2028/**
2029 * ibmvfc_sync_completion - Signal that a synchronous command has completed
2030 * @evt:	ibmvfc event struct
2031 *
2032 **/
2033static void ibmvfc_sync_completion(struct ibmvfc_event *evt)
2034{
2035	/* copy the response back */
2036	if (evt->sync_iu)
2037		*evt->sync_iu = *evt->xfer_iu;
2038
2039	complete(&evt->comp);
2040}
2041
2042/**
2043 * ibmvfc_bsg_timeout_done - Completion handler for cancelling BSG commands
2044 * @evt:	struct ibmvfc_event
2045 *
2046 **/
2047static void ibmvfc_bsg_timeout_done(struct ibmvfc_event *evt)
2048{
2049	struct ibmvfc_host *vhost = evt->vhost;
2050
2051	ibmvfc_free_event(evt);
2052	vhost->aborting_passthru = 0;
2053	dev_info(vhost->dev, "Passthru command cancelled\n");
2054}
2055
2056/**
2057 * ibmvfc_bsg_timeout - Handle a BSG timeout
2058 * @job:	struct bsg_job that timed out
2059 *
2060 * Returns:
2061 *	0 on success / other on failure
2062 **/
2063static int ibmvfc_bsg_timeout(struct bsg_job *job)
2064{
2065	struct ibmvfc_host *vhost = shost_priv(fc_bsg_to_shost(job));
2066	unsigned long port_id = (unsigned long)job->dd_data;
2067	struct ibmvfc_event *evt;
2068	struct ibmvfc_tmf *tmf;
2069	unsigned long flags;
2070	int rc;
2071
2072	ENTER;
2073	spin_lock_irqsave(vhost->host->host_lock, flags);
2074	if (vhost->aborting_passthru || vhost->state != IBMVFC_ACTIVE) {
2075		__ibmvfc_reset_host(vhost);
2076		spin_unlock_irqrestore(vhost->host->host_lock, flags);
2077		return 0;
2078	}
2079
2080	vhost->aborting_passthru = 1;
2081	evt = ibmvfc_get_reserved_event(&vhost->crq);
2082	if (!evt) {
2083		spin_unlock_irqrestore(vhost->host->host_lock, flags);
2084		return -ENOMEM;
2085	}
2086
2087	ibmvfc_init_event(evt, ibmvfc_bsg_timeout_done, IBMVFC_MAD_FORMAT);
2088
2089	tmf = &evt->iu.tmf;
2090	memset(tmf, 0, sizeof(*tmf));
2091	tmf->common.version = cpu_to_be32(1);
2092	tmf->common.opcode = cpu_to_be32(IBMVFC_TMF_MAD);
2093	tmf->common.length = cpu_to_be16(sizeof(*tmf));
2094	tmf->scsi_id = cpu_to_be64(port_id);
2095	tmf->cancel_key = cpu_to_be32(IBMVFC_PASSTHRU_CANCEL_KEY);
2096	tmf->my_cancel_key = cpu_to_be32(IBMVFC_INTERNAL_CANCEL_KEY);
2097	rc = ibmvfc_send_event(evt, vhost, default_timeout);
2098
2099	if (rc != 0) {
2100		vhost->aborting_passthru = 0;
2101		dev_err(vhost->dev, "Failed to send cancel event. rc=%d\n", rc);
2102		rc = -EIO;
2103	} else
2104		dev_info(vhost->dev, "Cancelling passthru command to port id 0x%lx\n",
2105			 port_id);
2106
2107	spin_unlock_irqrestore(vhost->host->host_lock, flags);
2108
2109	LEAVE;
2110	return rc;
2111}
2112
2113/**
2114 * ibmvfc_bsg_plogi - PLOGI into a target to handle a BSG command
2115 * @vhost:		struct ibmvfc_host to send command
2116 * @port_id:	port ID to send command
2117 *
2118 * Returns:
2119 *	0 on success / other on failure
2120 **/
2121static int ibmvfc_bsg_plogi(struct ibmvfc_host *vhost, unsigned int port_id)
2122{
2123	struct ibmvfc_port_login *plogi;
2124	struct ibmvfc_target *tgt;
2125	struct ibmvfc_event *evt;
2126	union ibmvfc_iu rsp_iu;
2127	unsigned long flags;
2128	int rc = 0, issue_login = 1;
2129
2130	ENTER;
2131	spin_lock_irqsave(vhost->host->host_lock, flags);
2132	list_for_each_entry(tgt, &vhost->targets, queue) {
2133		if (tgt->scsi_id == port_id) {
2134			issue_login = 0;
2135			break;
2136		}
2137	}
2138
2139	if (!issue_login)
2140		goto unlock_out;
2141	if (unlikely((rc = ibmvfc_host_chkready(vhost))))
2142		goto unlock_out;
2143
2144	evt = ibmvfc_get_reserved_event(&vhost->crq);
2145	if (!evt) {
2146		rc = -ENOMEM;
2147		goto unlock_out;
2148	}
2149	ibmvfc_init_event(evt, ibmvfc_sync_completion, IBMVFC_MAD_FORMAT);
2150	plogi = &evt->iu.plogi;
2151	memset(plogi, 0, sizeof(*plogi));
2152	plogi->common.version = cpu_to_be32(1);
2153	plogi->common.opcode = cpu_to_be32(IBMVFC_PORT_LOGIN);
2154	plogi->common.length = cpu_to_be16(sizeof(*plogi));
2155	plogi->scsi_id = cpu_to_be64(port_id);
2156	evt->sync_iu = &rsp_iu;
2157	init_completion(&evt->comp);
2158
2159	rc = ibmvfc_send_event(evt, vhost, default_timeout);
2160	spin_unlock_irqrestore(vhost->host->host_lock, flags);
2161
2162	if (rc)
2163		return -EIO;
2164
2165	wait_for_completion(&evt->comp);
2166
2167	if (rsp_iu.plogi.common.status)
2168		rc = -EIO;
2169
2170	spin_lock_irqsave(vhost->host->host_lock, flags);
2171	ibmvfc_free_event(evt);
2172unlock_out:
2173	spin_unlock_irqrestore(vhost->host->host_lock, flags);
2174	LEAVE;
2175	return rc;
2176}
2177
2178/**
2179 * ibmvfc_bsg_request - Handle a BSG request
2180 * @job:	struct bsg_job to be executed
2181 *
2182 * Returns:
2183 *	0 on success / other on failure
2184 **/
2185static int ibmvfc_bsg_request(struct bsg_job *job)
2186{
2187	struct ibmvfc_host *vhost = shost_priv(fc_bsg_to_shost(job));
2188	struct fc_rport *rport = fc_bsg_to_rport(job);
2189	struct ibmvfc_passthru_mad *mad;
2190	struct ibmvfc_event *evt;
2191	union ibmvfc_iu rsp_iu;
2192	unsigned long flags, port_id = -1;
2193	struct fc_bsg_request *bsg_request = job->request;
2194	struct fc_bsg_reply *bsg_reply = job->reply;
2195	unsigned int code = bsg_request->msgcode;
2196	int rc = 0, req_seg, rsp_seg, issue_login = 0;
2197	u32 fc_flags, rsp_len;
2198
2199	ENTER;
2200	bsg_reply->reply_payload_rcv_len = 0;
2201	if (rport)
2202		port_id = rport->port_id;
2203
2204	switch (code) {
2205	case FC_BSG_HST_ELS_NOLOGIN:
2206		port_id = (bsg_request->rqst_data.h_els.port_id[0] << 16) |
2207			(bsg_request->rqst_data.h_els.port_id[1] << 8) |
2208			bsg_request->rqst_data.h_els.port_id[2];
2209		fallthrough;
2210	case FC_BSG_RPT_ELS:
2211		fc_flags = IBMVFC_FC_ELS;
2212		break;
2213	case FC_BSG_HST_CT:
2214		issue_login = 1;
2215		port_id = (bsg_request->rqst_data.h_ct.port_id[0] << 16) |
2216			(bsg_request->rqst_data.h_ct.port_id[1] << 8) |
2217			bsg_request->rqst_data.h_ct.port_id[2];
2218		fallthrough;
2219	case FC_BSG_RPT_CT:
2220		fc_flags = IBMVFC_FC_CT_IU;
2221		break;
2222	default:
2223		return -ENOTSUPP;
2224	}
2225
2226	if (port_id == -1)
2227		return -EINVAL;
2228	if (!mutex_trylock(&vhost->passthru_mutex))
2229		return -EBUSY;
2230
2231	job->dd_data = (void *)port_id;
2232	req_seg = dma_map_sg(vhost->dev, job->request_payload.sg_list,
2233			     job->request_payload.sg_cnt, DMA_TO_DEVICE);
2234
2235	if (!req_seg) {
2236		mutex_unlock(&vhost->passthru_mutex);
2237		return -ENOMEM;
2238	}
2239
2240	rsp_seg = dma_map_sg(vhost->dev, job->reply_payload.sg_list,
2241			     job->reply_payload.sg_cnt, DMA_FROM_DEVICE);
2242
2243	if (!rsp_seg) {
2244		dma_unmap_sg(vhost->dev, job->request_payload.sg_list,
2245			     job->request_payload.sg_cnt, DMA_TO_DEVICE);
2246		mutex_unlock(&vhost->passthru_mutex);
2247		return -ENOMEM;
2248	}
2249
2250	if (req_seg > 1 || rsp_seg > 1) {
2251		rc = -EINVAL;
2252		goto out;
2253	}
2254
2255	if (issue_login)
2256		rc = ibmvfc_bsg_plogi(vhost, port_id);
2257
2258	spin_lock_irqsave(vhost->host->host_lock, flags);
2259
2260	if (unlikely(rc || (rport && (rc = fc_remote_port_chkready(rport)))) ||
2261	    unlikely((rc = ibmvfc_host_chkready(vhost)))) {
2262		spin_unlock_irqrestore(vhost->host->host_lock, flags);
2263		goto out;
2264	}
2265
2266	evt = ibmvfc_get_reserved_event(&vhost->crq);
2267	if (!evt) {
2268		spin_unlock_irqrestore(vhost->host->host_lock, flags);
2269		rc = -ENOMEM;
2270		goto out;
2271	}
2272	ibmvfc_init_event(evt, ibmvfc_sync_completion, IBMVFC_MAD_FORMAT);
2273	mad = &evt->iu.passthru;
2274
2275	memset(mad, 0, sizeof(*mad));
2276	mad->common.version = cpu_to_be32(1);
2277	mad->common.opcode = cpu_to_be32(IBMVFC_PASSTHRU);
2278	mad->common.length = cpu_to_be16(sizeof(*mad) - sizeof(mad->fc_iu) - sizeof(mad->iu));
2279
2280	mad->cmd_ioba.va = cpu_to_be64(be64_to_cpu(evt->crq.ioba) +
2281		offsetof(struct ibmvfc_passthru_mad, iu));
2282	mad->cmd_ioba.len = cpu_to_be32(sizeof(mad->iu));
2283
2284	mad->iu.cmd_len = cpu_to_be32(job->request_payload.payload_len);
2285	mad->iu.rsp_len = cpu_to_be32(job->reply_payload.payload_len);
2286	mad->iu.flags = cpu_to_be32(fc_flags);
2287	mad->iu.cancel_key = cpu_to_be32(IBMVFC_PASSTHRU_CANCEL_KEY);
2288
2289	mad->iu.cmd.va = cpu_to_be64(sg_dma_address(job->request_payload.sg_list));
2290	mad->iu.cmd.len = cpu_to_be32(sg_dma_len(job->request_payload.sg_list));
2291	mad->iu.rsp.va = cpu_to_be64(sg_dma_address(job->reply_payload.sg_list));
2292	mad->iu.rsp.len = cpu_to_be32(sg_dma_len(job->reply_payload.sg_list));
2293	mad->iu.scsi_id = cpu_to_be64(port_id);
2294	mad->iu.tag = cpu_to_be64((u64)evt);
2295	rsp_len = be32_to_cpu(mad->iu.rsp.len);
2296
2297	evt->sync_iu = &rsp_iu;
2298	init_completion(&evt->comp);
2299	rc = ibmvfc_send_event(evt, vhost, 0);
2300	spin_unlock_irqrestore(vhost->host->host_lock, flags);
2301
2302	if (rc) {
2303		rc = -EIO;
2304		goto out;
2305	}
2306
2307	wait_for_completion(&evt->comp);
2308
2309	if (rsp_iu.passthru.common.status)
2310		rc = -EIO;
2311	else
2312		bsg_reply->reply_payload_rcv_len = rsp_len;
2313
2314	spin_lock_irqsave(vhost->host->host_lock, flags);
2315	ibmvfc_free_event(evt);
2316	spin_unlock_irqrestore(vhost->host->host_lock, flags);
2317	bsg_reply->result = rc;
2318	bsg_job_done(job, bsg_reply->result,
2319		       bsg_reply->reply_payload_rcv_len);
2320	rc = 0;
2321out:
2322	dma_unmap_sg(vhost->dev, job->request_payload.sg_list,
2323		     job->request_payload.sg_cnt, DMA_TO_DEVICE);
2324	dma_unmap_sg(vhost->dev, job->reply_payload.sg_list,
2325		     job->reply_payload.sg_cnt, DMA_FROM_DEVICE);
2326	mutex_unlock(&vhost->passthru_mutex);
2327	LEAVE;
2328	return rc;
2329}
2330
2331/**
2332 * ibmvfc_reset_device - Reset the device with the specified reset type
2333 * @sdev:	scsi device to reset
2334 * @type:	reset type
2335 * @desc:	reset type description for log messages
2336 *
2337 * Returns:
2338 *	0 on success / other on failure
2339 **/
2340static int ibmvfc_reset_device(struct scsi_device *sdev, int type, char *desc)
2341{
2342	struct ibmvfc_host *vhost = shost_priv(sdev->host);
2343	struct fc_rport *rport = starget_to_rport(scsi_target(sdev));
2344	struct ibmvfc_cmd *tmf;
2345	struct ibmvfc_event *evt = NULL;
2346	union ibmvfc_iu rsp_iu;
2347	struct ibmvfc_fcp_cmd_iu *iu;
2348	struct ibmvfc_fcp_rsp *fc_rsp = ibmvfc_get_fcp_rsp(vhost, &rsp_iu.cmd);
2349	int rsp_rc = -EBUSY;
2350	unsigned long flags;
2351	int rsp_code = 0;
2352
2353	spin_lock_irqsave(vhost->host->host_lock, flags);
2354	if (vhost->state == IBMVFC_ACTIVE) {
2355		if (vhost->using_channels)
2356			evt = ibmvfc_get_event(&vhost->scsi_scrqs.scrqs[0]);
2357		else
2358			evt = ibmvfc_get_event(&vhost->crq);
2359
2360		if (!evt) {
2361			spin_unlock_irqrestore(vhost->host->host_lock, flags);
2362			return -ENOMEM;
2363		}
2364
2365		ibmvfc_init_event(evt, ibmvfc_sync_completion, IBMVFC_CMD_FORMAT);
2366		tmf = ibmvfc_init_vfc_cmd(evt, sdev);
2367		iu = ibmvfc_get_fcp_iu(vhost, tmf);
2368
2369		tmf->flags = cpu_to_be16((IBMVFC_NO_MEM_DESC | IBMVFC_TMF));
2370		if (ibmvfc_check_caps(vhost, IBMVFC_HANDLE_VF_WWPN))
2371			tmf->target_wwpn = cpu_to_be64(rport->port_name);
2372		iu->tmf_flags = type;
2373		evt->sync_iu = &rsp_iu;
2374
2375		init_completion(&evt->comp);
2376		rsp_rc = ibmvfc_send_event(evt, vhost, default_timeout);
2377	}
2378	spin_unlock_irqrestore(vhost->host->host_lock, flags);
2379
2380	if (rsp_rc != 0) {
2381		sdev_printk(KERN_ERR, sdev, "Failed to send %s reset event. rc=%d\n",
2382			    desc, rsp_rc);
2383		return -EIO;
2384	}
2385
2386	sdev_printk(KERN_INFO, sdev, "Resetting %s\n", desc);
2387	wait_for_completion(&evt->comp);
2388
2389	if (rsp_iu.cmd.status)
2390		rsp_code = ibmvfc_get_err_result(vhost, &rsp_iu.cmd);
2391
2392	if (rsp_code) {
2393		if (fc_rsp->flags & FCP_RSP_LEN_VALID)
2394			rsp_code = fc_rsp->data.info.rsp_code;
2395
2396		sdev_printk(KERN_ERR, sdev, "%s reset failed: %s (%x:%x) "
2397			    "flags: %x fcp_rsp: %x, scsi_status: %x\n", desc,
2398			    ibmvfc_get_cmd_error(be16_to_cpu(rsp_iu.cmd.status), be16_to_cpu(rsp_iu.cmd.error)),
2399			    be16_to_cpu(rsp_iu.cmd.status), be16_to_cpu(rsp_iu.cmd.error), fc_rsp->flags, rsp_code,
2400			    fc_rsp->scsi_status);
2401		rsp_rc = -EIO;
2402	} else
2403		sdev_printk(KERN_INFO, sdev, "%s reset successful\n", desc);
2404
2405	spin_lock_irqsave(vhost->host->host_lock, flags);
2406	ibmvfc_free_event(evt);
2407	spin_unlock_irqrestore(vhost->host->host_lock, flags);
2408	return rsp_rc;
2409}
2410
2411/**
2412 * ibmvfc_match_rport - Match function for specified remote port
2413 * @evt:	ibmvfc event struct
2414 * @rport:	device to match
2415 *
2416 * Returns:
2417 *	1 if event matches rport / 0 if event does not match rport
2418 **/
2419static int ibmvfc_match_rport(struct ibmvfc_event *evt, void *rport)
2420{
2421	struct fc_rport *cmd_rport;
2422
2423	if (evt->cmnd) {
2424		cmd_rport = starget_to_rport(scsi_target(evt->cmnd->device));
2425		if (cmd_rport == rport)
2426			return 1;
2427	}
2428	return 0;
2429}
2430
2431/**
2432 * ibmvfc_match_target - Match function for specified target
2433 * @evt:	ibmvfc event struct
2434 * @device:	device to match (starget)
2435 *
2436 * Returns:
2437 *	1 if event matches starget / 0 if event does not match starget
2438 **/
2439static int ibmvfc_match_target(struct ibmvfc_event *evt, void *device)
2440{
2441	if (evt->cmnd && scsi_target(evt->cmnd->device) == device)
2442		return 1;
2443	return 0;
2444}
2445
2446/**
2447 * ibmvfc_match_lun - Match function for specified LUN
2448 * @evt:	ibmvfc event struct
2449 * @device:	device to match (sdev)
2450 *
2451 * Returns:
2452 *	1 if event matches sdev / 0 if event does not match sdev
2453 **/
2454static int ibmvfc_match_lun(struct ibmvfc_event *evt, void *device)
2455{
2456	if (evt->cmnd && evt->cmnd->device == device)
2457		return 1;
2458	return 0;
2459}
2460
2461/**
2462 * ibmvfc_event_is_free - Check if event is free or not
2463 * @evt:	ibmvfc event struct
2464 *
2465 * Returns:
2466 *	true / false
2467 **/
2468static bool ibmvfc_event_is_free(struct ibmvfc_event *evt)
2469{
2470	struct ibmvfc_event *loop_evt;
2471
2472	list_for_each_entry(loop_evt, &evt->queue->free, queue_list)
2473		if (loop_evt == evt)
2474			return true;
2475
2476	return false;
2477}
2478
2479/**
2480 * ibmvfc_wait_for_ops - Wait for ops to complete
2481 * @vhost:	ibmvfc host struct
2482 * @device:	device to match (starget or sdev)
2483 * @match:	match function
2484 *
2485 * Returns:
2486 *	SUCCESS / FAILED
2487 **/
2488static int ibmvfc_wait_for_ops(struct ibmvfc_host *vhost, void *device,
2489			       int (*match) (struct ibmvfc_event *, void *))
2490{
2491	struct ibmvfc_event *evt;
2492	DECLARE_COMPLETION_ONSTACK(comp);
2493	int wait, i, q_index, q_size;
2494	unsigned long flags;
2495	signed long timeout = IBMVFC_ABORT_WAIT_TIMEOUT * HZ;
2496	struct ibmvfc_queue *queues;
2497
2498	ENTER;
2499	if (vhost->mq_enabled && vhost->using_channels) {
2500		queues = vhost->scsi_scrqs.scrqs;
2501		q_size = vhost->scsi_scrqs.active_queues;
2502	} else {
2503		queues = &vhost->crq;
2504		q_size = 1;
2505	}
2506
2507	do {
2508		wait = 0;
2509		spin_lock_irqsave(vhost->host->host_lock, flags);
2510		for (q_index = 0; q_index < q_size; q_index++) {
2511			spin_lock(&queues[q_index].l_lock);
2512			for (i = 0; i < queues[q_index].evt_pool.size; i++) {
2513				evt = &queues[q_index].evt_pool.events[i];
2514				if (!ibmvfc_event_is_free(evt)) {
2515					if (match(evt, device)) {
2516						evt->eh_comp = &comp;
2517						wait++;
2518					}
2519				}
2520			}
2521			spin_unlock(&queues[q_index].l_lock);
2522		}
2523		spin_unlock_irqrestore(vhost->host->host_lock, flags);
2524
2525		if (wait) {
2526			timeout = wait_for_completion_timeout(&comp, timeout);
2527
2528			if (!timeout) {
2529				wait = 0;
2530				spin_lock_irqsave(vhost->host->host_lock, flags);
2531				for (q_index = 0; q_index < q_size; q_index++) {
2532					spin_lock(&queues[q_index].l_lock);
2533					for (i = 0; i < queues[q_index].evt_pool.size; i++) {
2534						evt = &queues[q_index].evt_pool.events[i];
2535						if (!ibmvfc_event_is_free(evt)) {
2536							if (match(evt, device)) {
2537								evt->eh_comp = NULL;
2538								wait++;
2539							}
2540						}
2541					}
2542					spin_unlock(&queues[q_index].l_lock);
2543				}
2544				spin_unlock_irqrestore(vhost->host->host_lock, flags);
2545				if (wait)
2546					dev_err(vhost->dev, "Timed out waiting for aborted commands\n");
2547				LEAVE;
2548				return wait ? FAILED : SUCCESS;
2549			}
2550		}
2551	} while (wait);
2552
2553	LEAVE;
2554	return SUCCESS;
2555}
2556
2557static struct ibmvfc_event *ibmvfc_init_tmf(struct ibmvfc_queue *queue,
2558					    struct scsi_device *sdev,
2559					    int type)
2560{
2561	struct ibmvfc_host *vhost = shost_priv(sdev->host);
2562	struct scsi_target *starget = scsi_target(sdev);
2563	struct fc_rport *rport = starget_to_rport(starget);
2564	struct ibmvfc_event *evt;
2565	struct ibmvfc_tmf *tmf;
2566
2567	evt = ibmvfc_get_reserved_event(queue);
2568	if (!evt)
2569		return NULL;
2570	ibmvfc_init_event(evt, ibmvfc_sync_completion, IBMVFC_MAD_FORMAT);
2571
2572	tmf = &evt->iu.tmf;
2573	memset(tmf, 0, sizeof(*tmf));
2574	if (ibmvfc_check_caps(vhost, IBMVFC_HANDLE_VF_WWPN)) {
2575		tmf->common.version = cpu_to_be32(2);
2576		tmf->target_wwpn = cpu_to_be64(rport->port_name);
2577	} else {
2578		tmf->common.version = cpu_to_be32(1);
2579	}
2580	tmf->common.opcode = cpu_to_be32(IBMVFC_TMF_MAD);
2581	tmf->common.length = cpu_to_be16(sizeof(*tmf));
2582	tmf->scsi_id = cpu_to_be64(rport->port_id);
2583	int_to_scsilun(sdev->lun, &tmf->lun);
2584	if (!ibmvfc_check_caps(vhost, IBMVFC_CAN_SUPPRESS_ABTS))
2585		type &= ~IBMVFC_TMF_SUPPRESS_ABTS;
2586	if (vhost->state == IBMVFC_ACTIVE)
2587		tmf->flags = cpu_to_be32((type | IBMVFC_TMF_LUA_VALID));
2588	else
2589		tmf->flags = cpu_to_be32(((type & IBMVFC_TMF_SUPPRESS_ABTS) | IBMVFC_TMF_LUA_VALID));
2590	tmf->cancel_key = cpu_to_be32((unsigned long)sdev->hostdata);
2591	tmf->my_cancel_key = cpu_to_be32((unsigned long)starget->hostdata);
2592
2593	init_completion(&evt->comp);
2594
2595	return evt;
2596}
2597
2598static int ibmvfc_cancel_all_mq(struct scsi_device *sdev, int type)
2599{
2600	struct ibmvfc_host *vhost = shost_priv(sdev->host);
2601	struct ibmvfc_event *evt, *found_evt, *temp;
2602	struct ibmvfc_queue *queues = vhost->scsi_scrqs.scrqs;
2603	unsigned long flags;
2604	int num_hwq, i;
2605	int fail = 0;
2606	LIST_HEAD(cancelq);
2607	u16 status;
2608
2609	ENTER;
2610	spin_lock_irqsave(vhost->host->host_lock, flags);
2611	num_hwq = vhost->scsi_scrqs.active_queues;
2612	for (i = 0; i < num_hwq; i++) {
2613		spin_lock(queues[i].q_lock);
2614		spin_lock(&queues[i].l_lock);
2615		found_evt = NULL;
2616		list_for_each_entry(evt, &queues[i].sent, queue_list) {
2617			if (evt->cmnd && evt->cmnd->device == sdev) {
2618				found_evt = evt;
2619				break;
2620			}
2621		}
2622		spin_unlock(&queues[i].l_lock);
2623
2624		if (found_evt && vhost->logged_in) {
2625			evt = ibmvfc_init_tmf(&queues[i], sdev, type);
2626			if (!evt) {
2627				spin_unlock(queues[i].q_lock);
2628				spin_unlock_irqrestore(vhost->host->host_lock, flags);
2629				return -ENOMEM;
2630			}
2631			evt->sync_iu = &queues[i].cancel_rsp;
2632			ibmvfc_send_event(evt, vhost, default_timeout);
2633			list_add_tail(&evt->cancel, &cancelq);
2634		}
2635
2636		spin_unlock(queues[i].q_lock);
2637	}
2638	spin_unlock_irqrestore(vhost->host->host_lock, flags);
2639
2640	if (list_empty(&cancelq)) {
2641		if (vhost->log_level > IBMVFC_DEFAULT_LOG_LEVEL)
2642			sdev_printk(KERN_INFO, sdev, "No events found to cancel\n");
2643		return 0;
2644	}
2645
2646	sdev_printk(KERN_INFO, sdev, "Cancelling outstanding commands.\n");
2647
2648	list_for_each_entry_safe(evt, temp, &cancelq, cancel) {
2649		wait_for_completion(&evt->comp);
2650		status = be16_to_cpu(evt->queue->cancel_rsp.mad_common.status);
2651		list_del(&evt->cancel);
2652		ibmvfc_free_event(evt);
2653
2654		if (status != IBMVFC_MAD_SUCCESS) {
2655			sdev_printk(KERN_WARNING, sdev, "Cancel failed with rc=%x\n", status);
2656			switch (status) {
2657			case IBMVFC_MAD_DRIVER_FAILED:
2658			case IBMVFC_MAD_CRQ_ERROR:
2659			/* Host adapter most likely going through reset, return success to
2660			 * the caller will wait for the command being cancelled to get returned
2661			 */
2662				break;
2663			default:
2664				fail = 1;
2665				break;
2666			}
2667		}
2668	}
2669
2670	if (fail)
2671		return -EIO;
2672
2673	sdev_printk(KERN_INFO, sdev, "Successfully cancelled outstanding commands\n");
2674	LEAVE;
2675	return 0;
2676}
2677
2678static int ibmvfc_cancel_all_sq(struct scsi_device *sdev, int type)
2679{
2680	struct ibmvfc_host *vhost = shost_priv(sdev->host);
2681	struct ibmvfc_event *evt, *found_evt;
2682	union ibmvfc_iu rsp;
2683	int rsp_rc = -EBUSY;
2684	unsigned long flags;
2685	u16 status;
2686
2687	ENTER;
2688	found_evt = NULL;
2689	spin_lock_irqsave(vhost->host->host_lock, flags);
2690	spin_lock(&vhost->crq.l_lock);
2691	list_for_each_entry(evt, &vhost->crq.sent, queue_list) {
2692		if (evt->cmnd && evt->cmnd->device == sdev) {
2693			found_evt = evt;
2694			break;
2695		}
2696	}
2697	spin_unlock(&vhost->crq.l_lock);
2698
2699	if (!found_evt) {
2700		if (vhost->log_level > IBMVFC_DEFAULT_LOG_LEVEL)
2701			sdev_printk(KERN_INFO, sdev, "No events found to cancel\n");
2702		spin_unlock_irqrestore(vhost->host->host_lock, flags);
2703		return 0;
2704	}
2705
2706	if (vhost->logged_in) {
2707		evt = ibmvfc_init_tmf(&vhost->crq, sdev, type);
2708		evt->sync_iu = &rsp;
2709		rsp_rc = ibmvfc_send_event(evt, vhost, default_timeout);
2710	}
2711
2712	spin_unlock_irqrestore(vhost->host->host_lock, flags);
2713
2714	if (rsp_rc != 0) {
2715		sdev_printk(KERN_ERR, sdev, "Failed to send cancel event. rc=%d\n", rsp_rc);
2716		/* If failure is received, the host adapter is most likely going
2717		 through reset, return success so the caller will wait for the command
2718		 being cancelled to get returned */
2719		return 0;
2720	}
2721
2722	sdev_printk(KERN_INFO, sdev, "Cancelling outstanding commands.\n");
2723
2724	wait_for_completion(&evt->comp);
2725	status = be16_to_cpu(rsp.mad_common.status);
2726	spin_lock_irqsave(vhost->host->host_lock, flags);
2727	ibmvfc_free_event(evt);
2728	spin_unlock_irqrestore(vhost->host->host_lock, flags);
2729
2730	if (status != IBMVFC_MAD_SUCCESS) {
2731		sdev_printk(KERN_WARNING, sdev, "Cancel failed with rc=%x\n", status);
2732		switch (status) {
2733		case IBMVFC_MAD_DRIVER_FAILED:
2734		case IBMVFC_MAD_CRQ_ERROR:
2735			/* Host adapter most likely going through reset, return success to
2736			 the caller will wait for the command being cancelled to get returned */
2737			return 0;
2738		default:
2739			return -EIO;
2740		};
2741	}
2742
2743	sdev_printk(KERN_INFO, sdev, "Successfully cancelled outstanding commands\n");
2744	return 0;
2745}
2746
2747/**
2748 * ibmvfc_cancel_all - Cancel all outstanding commands to the device
2749 * @sdev:	scsi device to cancel commands
2750 * @type:	type of error recovery being performed
2751 *
2752 * This sends a cancel to the VIOS for the specified device. This does
2753 * NOT send any abort to the actual device. That must be done separately.
2754 *
2755 * Returns:
2756 *	0 on success / other on failure
2757 **/
2758static int ibmvfc_cancel_all(struct scsi_device *sdev, int type)
2759{
2760	struct ibmvfc_host *vhost = shost_priv(sdev->host);
2761
2762	if (vhost->mq_enabled && vhost->using_channels)
2763		return ibmvfc_cancel_all_mq(sdev, type);
2764	else
2765		return ibmvfc_cancel_all_sq(sdev, type);
2766}
2767
2768/**
2769 * ibmvfc_match_key - Match function for specified cancel key
2770 * @evt:	ibmvfc event struct
2771 * @key:	cancel key to match
2772 *
2773 * Returns:
2774 *	1 if event matches key / 0 if event does not match key
2775 **/
2776static int ibmvfc_match_key(struct ibmvfc_event *evt, void *key)
2777{
2778	unsigned long cancel_key = (unsigned long)key;
2779
2780	if (evt->crq.format == IBMVFC_CMD_FORMAT &&
2781	    be32_to_cpu(evt->iu.cmd.cancel_key) == cancel_key)
2782		return 1;
2783	return 0;
2784}
2785
2786/**
2787 * ibmvfc_match_evt - Match function for specified event
2788 * @evt:	ibmvfc event struct
2789 * @match:	event to match
2790 *
2791 * Returns:
2792 *	1 if event matches key / 0 if event does not match key
2793 **/
2794static int ibmvfc_match_evt(struct ibmvfc_event *evt, void *match)
2795{
2796	if (evt == match)
2797		return 1;
2798	return 0;
2799}
2800
2801/**
2802 * ibmvfc_abort_task_set - Abort outstanding commands to the device
2803 * @sdev:	scsi device to abort commands
2804 *
2805 * This sends an Abort Task Set to the VIOS for the specified device. This does
2806 * NOT send any cancel to the VIOS. That must be done separately.
2807 *
2808 * Returns:
2809 *	0 on success / other on failure
2810 **/
2811static int ibmvfc_abort_task_set(struct scsi_device *sdev)
2812{
2813	struct ibmvfc_host *vhost = shost_priv(sdev->host);
2814	struct fc_rport *rport = starget_to_rport(scsi_target(sdev));
2815	struct ibmvfc_cmd *tmf;
2816	struct ibmvfc_event *evt, *found_evt;
2817	union ibmvfc_iu rsp_iu;
2818	struct ibmvfc_fcp_cmd_iu *iu;
2819	struct ibmvfc_fcp_rsp *fc_rsp = ibmvfc_get_fcp_rsp(vhost, &rsp_iu.cmd);
2820	int rc, rsp_rc = -EBUSY;
2821	unsigned long flags, timeout = IBMVFC_ABORT_TIMEOUT;
2822	int rsp_code = 0;
2823
2824	found_evt = NULL;
2825	spin_lock_irqsave(vhost->host->host_lock, flags);
2826	spin_lock(&vhost->crq.l_lock);
2827	list_for_each_entry(evt, &vhost->crq.sent, queue_list) {
2828		if (evt->cmnd && evt->cmnd->device == sdev) {
2829			found_evt = evt;
2830			break;
2831		}
2832	}
2833	spin_unlock(&vhost->crq.l_lock);
2834
2835	if (!found_evt) {
2836		if (vhost->log_level > IBMVFC_DEFAULT_LOG_LEVEL)
2837			sdev_printk(KERN_INFO, sdev, "No events found to abort\n");
2838		spin_unlock_irqrestore(vhost->host->host_lock, flags);
2839		return 0;
2840	}
2841
2842	if (vhost->state == IBMVFC_ACTIVE) {
2843		evt = ibmvfc_get_event(&vhost->crq);
2844		if (!evt) {
2845			spin_unlock_irqrestore(vhost->host->host_lock, flags);
2846			return -ENOMEM;
2847		}
2848		ibmvfc_init_event(evt, ibmvfc_sync_completion, IBMVFC_CMD_FORMAT);
2849		tmf = ibmvfc_init_vfc_cmd(evt, sdev);
2850		iu = ibmvfc_get_fcp_iu(vhost, tmf);
2851
2852		if (ibmvfc_check_caps(vhost, IBMVFC_HANDLE_VF_WWPN))
2853			tmf->target_wwpn = cpu_to_be64(rport->port_name);
2854		iu->tmf_flags = IBMVFC_ABORT_TASK_SET;
2855		tmf->flags = cpu_to_be16((IBMVFC_NO_MEM_DESC | IBMVFC_TMF));
2856		evt->sync_iu = &rsp_iu;
2857
2858		tmf->correlation = cpu_to_be64((u64)evt);
2859
2860		init_completion(&evt->comp);
2861		rsp_rc = ibmvfc_send_event(evt, vhost, default_timeout);
2862	}
2863
2864	spin_unlock_irqrestore(vhost->host->host_lock, flags);
2865
2866	if (rsp_rc != 0) {
2867		sdev_printk(KERN_ERR, sdev, "Failed to send abort. rc=%d\n", rsp_rc);
2868		return -EIO;
2869	}
2870
2871	sdev_printk(KERN_INFO, sdev, "Aborting outstanding commands\n");
2872	timeout = wait_for_completion_timeout(&evt->comp, timeout);
2873
2874	if (!timeout) {
2875		rc = ibmvfc_cancel_all(sdev, 0);
2876		if (!rc) {
2877			rc = ibmvfc_wait_for_ops(vhost, sdev->hostdata, ibmvfc_match_key);
2878			if (rc == SUCCESS)
2879				rc = 0;
2880		}
2881
2882		if (rc) {
2883			sdev_printk(KERN_INFO, sdev, "Cancel failed, resetting host\n");
2884			ibmvfc_reset_host(vhost);
2885			rsp_rc = -EIO;
2886			rc = ibmvfc_wait_for_ops(vhost, sdev->hostdata, ibmvfc_match_key);
2887
2888			if (rc == SUCCESS)
2889				rsp_rc = 0;
2890
2891			rc = ibmvfc_wait_for_ops(vhost, evt, ibmvfc_match_evt);
2892			if (rc != SUCCESS) {
2893				spin_lock_irqsave(vhost->host->host_lock, flags);
2894				ibmvfc_hard_reset_host(vhost);
2895				spin_unlock_irqrestore(vhost->host->host_lock, flags);
2896				rsp_rc = 0;
2897			}
2898
2899			goto out;
2900		}
2901	}
2902
2903	if (rsp_iu.cmd.status)
2904		rsp_code = ibmvfc_get_err_result(vhost, &rsp_iu.cmd);
2905
2906	if (rsp_code) {
2907		if (fc_rsp->flags & FCP_RSP_LEN_VALID)
2908			rsp_code = fc_rsp->data.info.rsp_code;
2909
2910		sdev_printk(KERN_ERR, sdev, "Abort failed: %s (%x:%x) "
2911			    "flags: %x fcp_rsp: %x, scsi_status: %x\n",
2912			    ibmvfc_get_cmd_error(be16_to_cpu(rsp_iu.cmd.status), be16_to_cpu(rsp_iu.cmd.error)),
2913			    be16_to_cpu(rsp_iu.cmd.status), be16_to_cpu(rsp_iu.cmd.error), fc_rsp->flags, rsp_code,
2914			    fc_rsp->scsi_status);
2915		rsp_rc = -EIO;
2916	} else
2917		sdev_printk(KERN_INFO, sdev, "Abort successful\n");
2918
2919out:
2920	spin_lock_irqsave(vhost->host->host_lock, flags);
2921	ibmvfc_free_event(evt);
2922	spin_unlock_irqrestore(vhost->host->host_lock, flags);
2923	return rsp_rc;
2924}
2925
2926/**
2927 * ibmvfc_eh_abort_handler - Abort a command
2928 * @cmd:	scsi command to abort
2929 *
2930 * Returns:
2931 *	SUCCESS / FAST_IO_FAIL / FAILED
2932 **/
2933static int ibmvfc_eh_abort_handler(struct scsi_cmnd *cmd)
2934{
2935	struct scsi_device *sdev = cmd->device;
2936	struct ibmvfc_host *vhost = shost_priv(sdev->host);
2937	int cancel_rc, block_rc;
2938	int rc = FAILED;
2939
2940	ENTER;
2941	block_rc = fc_block_scsi_eh(cmd);
2942	ibmvfc_wait_while_resetting(vhost);
2943	if (block_rc != FAST_IO_FAIL) {
2944		cancel_rc = ibmvfc_cancel_all(sdev, IBMVFC_TMF_ABORT_TASK_SET);
2945		ibmvfc_abort_task_set(sdev);
2946	} else
2947		cancel_rc = ibmvfc_cancel_all(sdev, IBMVFC_TMF_SUPPRESS_ABTS);
2948
2949	if (!cancel_rc)
2950		rc = ibmvfc_wait_for_ops(vhost, sdev, ibmvfc_match_lun);
2951
2952	if (block_rc == FAST_IO_FAIL && rc != FAILED)
2953		rc = FAST_IO_FAIL;
2954
2955	LEAVE;
2956	return rc;
2957}
2958
2959/**
2960 * ibmvfc_eh_device_reset_handler - Reset a single LUN
2961 * @cmd:	scsi command struct
2962 *
2963 * Returns:
2964 *	SUCCESS / FAST_IO_FAIL / FAILED
2965 **/
2966static int ibmvfc_eh_device_reset_handler(struct scsi_cmnd *cmd)
2967{
2968	struct scsi_device *sdev = cmd->device;
2969	struct ibmvfc_host *vhost = shost_priv(sdev->host);
2970	int cancel_rc, block_rc, reset_rc = 0;
2971	int rc = FAILED;
2972
2973	ENTER;
2974	block_rc = fc_block_scsi_eh(cmd);
2975	ibmvfc_wait_while_resetting(vhost);
2976	if (block_rc != FAST_IO_FAIL) {
2977		cancel_rc = ibmvfc_cancel_all(sdev, IBMVFC_TMF_LUN_RESET);
2978		reset_rc = ibmvfc_reset_device(sdev, IBMVFC_LUN_RESET, "LUN");
2979	} else
2980		cancel_rc = ibmvfc_cancel_all(sdev, IBMVFC_TMF_SUPPRESS_ABTS);
2981
2982	if (!cancel_rc && !reset_rc)
2983		rc = ibmvfc_wait_for_ops(vhost, sdev, ibmvfc_match_lun);
2984
2985	if (block_rc == FAST_IO_FAIL && rc != FAILED)
2986		rc = FAST_IO_FAIL;
2987
2988	LEAVE;
2989	return rc;
2990}
2991
2992/**
2993 * ibmvfc_dev_cancel_all_noreset - Device iterated cancel all function
2994 * @sdev:	scsi device struct
2995 * @data:	return code
2996 *
2997 **/
2998static void ibmvfc_dev_cancel_all_noreset(struct scsi_device *sdev, void *data)
2999{
3000	unsigned long *rc = data;
3001	*rc |= ibmvfc_cancel_all(sdev, IBMVFC_TMF_SUPPRESS_ABTS);
3002}
3003
3004/**
3005 * ibmvfc_eh_target_reset_handler - Reset the target
3006 * @cmd:	scsi command struct
3007 *
3008 * Returns:
3009 *	SUCCESS / FAST_IO_FAIL / FAILED
3010 **/
3011static int ibmvfc_eh_target_reset_handler(struct scsi_cmnd *cmd)
3012{
3013	struct scsi_target *starget = scsi_target(cmd->device);
3014	struct fc_rport *rport = starget_to_rport(starget);
3015	struct Scsi_Host *shost = rport_to_shost(rport);
3016	struct ibmvfc_host *vhost = shost_priv(shost);
3017	int block_rc;
3018	int reset_rc = 0;
3019	int rc = FAILED;
3020	unsigned long cancel_rc = 0;
3021	bool tgt_reset = false;
3022
3023	ENTER;
3024	block_rc = fc_block_rport(rport);
3025	ibmvfc_wait_while_resetting(vhost);
3026	if (block_rc != FAST_IO_FAIL) {
3027		struct scsi_device *sdev;
3028
3029		shost_for_each_device(sdev, shost) {
3030			if ((sdev->channel != starget->channel) ||
3031			    (sdev->id != starget->id))
3032				continue;
3033
3034			cancel_rc |= ibmvfc_cancel_all(sdev,
3035						       IBMVFC_TMF_TGT_RESET);
3036			if (!tgt_reset) {
3037				reset_rc = ibmvfc_reset_device(sdev,
3038					IBMVFC_TARGET_RESET, "target");
3039				tgt_reset = true;
3040			}
3041		}
3042	} else
3043		starget_for_each_device(starget, &cancel_rc,
3044					ibmvfc_dev_cancel_all_noreset);
3045
3046	if (!cancel_rc && !reset_rc)
3047		rc = ibmvfc_wait_for_ops(vhost, starget, ibmvfc_match_target);
3048
3049	if (block_rc == FAST_IO_FAIL && rc != FAILED)
3050		rc = FAST_IO_FAIL;
3051
3052	LEAVE;
3053	return rc;
3054}
3055
3056/**
3057 * ibmvfc_eh_host_reset_handler - Reset the connection to the server
3058 * @cmd:	struct scsi_cmnd having problems
3059 *
3060 **/
3061static int ibmvfc_eh_host_reset_handler(struct scsi_cmnd *cmd)
3062{
3063	int rc;
3064	struct ibmvfc_host *vhost = shost_priv(cmd->device->host);
3065
3066	dev_err(vhost->dev, "Resetting connection due to error recovery\n");
3067	rc = ibmvfc_issue_fc_host_lip(vhost->host);
3068
3069	return rc ? FAILED : SUCCESS;
3070}
3071
3072/**
3073 * ibmvfc_terminate_rport_io - Terminate all pending I/O to the rport.
3074 * @rport:		rport struct
3075 *
3076 * Return value:
3077 * 	none
3078 **/
3079static void ibmvfc_terminate_rport_io(struct fc_rport *rport)
3080{
3081	struct Scsi_Host *shost = rport_to_shost(rport);
3082	struct ibmvfc_host *vhost = shost_priv(shost);
3083	struct fc_rport *dev_rport;
3084	struct scsi_device *sdev;
3085	struct ibmvfc_target *tgt;
3086	unsigned long rc, flags;
3087	unsigned int found;
3088
3089	ENTER;
3090	shost_for_each_device(sdev, shost) {
3091		dev_rport = starget_to_rport(scsi_target(sdev));
3092		if (dev_rport != rport)
3093			continue;
3094		ibmvfc_cancel_all(sdev, IBMVFC_TMF_SUPPRESS_ABTS);
3095	}
3096
3097	rc = ibmvfc_wait_for_ops(vhost, rport, ibmvfc_match_rport);
3098
3099	if (rc == FAILED)
3100		ibmvfc_issue_fc_host_lip(shost);
3101
3102	spin_lock_irqsave(shost->host_lock, flags);
3103	found = 0;
3104	list_for_each_entry(tgt, &vhost->targets, queue) {
3105		if (tgt->scsi_id == rport->port_id) {
3106			found++;
3107			break;
3108		}
3109	}
3110
3111	if (found && tgt->action == IBMVFC_TGT_ACTION_LOGOUT_DELETED_RPORT) {
3112		/*
3113		 * If we get here, that means we previously attempted to send
3114		 * an implicit logout to the target but it failed, most likely
3115		 * due to I/O being pending, so we need to send it again
3116		 */
3117		ibmvfc_del_tgt(tgt);
3118		ibmvfc_reinit_host(vhost);
3119	}
3120
3121	spin_unlock_irqrestore(shost->host_lock, flags);
3122	LEAVE;
3123}
3124
3125static const struct ibmvfc_async_desc ae_desc [] = {
3126	{ "PLOGI",	IBMVFC_AE_ELS_PLOGI,	IBMVFC_DEFAULT_LOG_LEVEL + 1 },
3127	{ "LOGO",	IBMVFC_AE_ELS_LOGO,	IBMVFC_DEFAULT_LOG_LEVEL + 1 },
3128	{ "PRLO",	IBMVFC_AE_ELS_PRLO,	IBMVFC_DEFAULT_LOG_LEVEL + 1 },
3129	{ "N-Port SCN",	IBMVFC_AE_SCN_NPORT,	IBMVFC_DEFAULT_LOG_LEVEL + 1 },
3130	{ "Group SCN",	IBMVFC_AE_SCN_GROUP,	IBMVFC_DEFAULT_LOG_LEVEL + 1 },
3131	{ "Domain SCN",	IBMVFC_AE_SCN_DOMAIN,	IBMVFC_DEFAULT_LOG_LEVEL },
3132	{ "Fabric SCN",	IBMVFC_AE_SCN_FABRIC,	IBMVFC_DEFAULT_LOG_LEVEL },
3133	{ "Link Up",	IBMVFC_AE_LINK_UP,	IBMVFC_DEFAULT_LOG_LEVEL },
3134	{ "Link Down",	IBMVFC_AE_LINK_DOWN,	IBMVFC_DEFAULT_LOG_LEVEL },
3135	{ "Link Dead",	IBMVFC_AE_LINK_DEAD,	IBMVFC_DEFAULT_LOG_LEVEL },
3136	{ "Halt",	IBMVFC_AE_HALT,		IBMVFC_DEFAULT_LOG_LEVEL },
3137	{ "Resume",	IBMVFC_AE_RESUME,	IBMVFC_DEFAULT_LOG_LEVEL },
3138	{ "Adapter Failed", IBMVFC_AE_ADAPTER_FAILED, IBMVFC_DEFAULT_LOG_LEVEL },
3139};
3140
3141static const struct ibmvfc_async_desc unknown_ae = {
3142	"Unknown async", 0, IBMVFC_DEFAULT_LOG_LEVEL
3143};
3144
3145/**
3146 * ibmvfc_get_ae_desc - Get text description for async event
3147 * @ae:	async event
3148 *
3149 **/
3150static const struct ibmvfc_async_desc *ibmvfc_get_ae_desc(u64 ae)
3151{
3152	int i;
3153
3154	for (i = 0; i < ARRAY_SIZE(ae_desc); i++)
3155		if (ae_desc[i].ae == ae)
3156			return &ae_desc[i];
3157
3158	return &unknown_ae;
3159}
3160
3161static const struct {
3162	enum ibmvfc_ae_link_state state;
3163	const char *desc;
3164} link_desc [] = {
3165	{ IBMVFC_AE_LS_LINK_UP,		" link up" },
3166	{ IBMVFC_AE_LS_LINK_BOUNCED,	" link bounced" },
3167	{ IBMVFC_AE_LS_LINK_DOWN,	" link down" },
3168	{ IBMVFC_AE_LS_LINK_DEAD,	" link dead" },
3169};
3170
3171/**
3172 * ibmvfc_get_link_state - Get text description for link state
3173 * @state:	link state
3174 *
3175 **/
3176static const char *ibmvfc_get_link_state(enum ibmvfc_ae_link_state state)
3177{
3178	int i;
3179
3180	for (i = 0; i < ARRAY_SIZE(link_desc); i++)
3181		if (link_desc[i].state == state)
3182			return link_desc[i].desc;
3183
3184	return "";
3185}
3186
3187/**
3188 * ibmvfc_handle_async - Handle an async event from the adapter
3189 * @crq:	crq to process
3190 * @vhost:	ibmvfc host struct
3191 *
3192 **/
3193static void ibmvfc_handle_async(struct ibmvfc_async_crq *crq,
3194				struct ibmvfc_host *vhost)
3195{
3196	const struct ibmvfc_async_desc *desc = ibmvfc_get_ae_desc(be64_to_cpu(crq->event));
3197	struct ibmvfc_target *tgt;
3198
3199	ibmvfc_log(vhost, desc->log_level, "%s event received. scsi_id: %llx, wwpn: %llx,"
3200		   " node_name: %llx%s\n", desc->desc, be64_to_cpu(crq->scsi_id),
3201		   be64_to_cpu(crq->wwpn), be64_to_cpu(crq->node_name),
3202		   ibmvfc_get_link_state(crq->link_state));
3203
3204	switch (be64_to_cpu(crq->event)) {
3205	case IBMVFC_AE_RESUME:
3206		switch (crq->link_state) {
3207		case IBMVFC_AE_LS_LINK_DOWN:
3208			ibmvfc_link_down(vhost, IBMVFC_LINK_DOWN);
3209			break;
3210		case IBMVFC_AE_LS_LINK_DEAD:
3211			ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
3212			break;
3213		case IBMVFC_AE_LS_LINK_UP:
3214		case IBMVFC_AE_LS_LINK_BOUNCED:
3215		default:
3216			vhost->events_to_log |= IBMVFC_AE_LINKUP;
3217			vhost->delay_init = 1;
3218			__ibmvfc_reset_host(vhost);
3219			break;
3220		}
3221
3222		break;
3223	case IBMVFC_AE_LINK_UP:
3224		vhost->events_to_log |= IBMVFC_AE_LINKUP;
3225		vhost->delay_init = 1;
3226		__ibmvfc_reset_host(vhost);
3227		break;
3228	case IBMVFC_AE_SCN_FABRIC:
3229	case IBMVFC_AE_SCN_DOMAIN:
3230		vhost->events_to_log |= IBMVFC_AE_RSCN;
3231		if (vhost->state < IBMVFC_HALTED) {
3232			vhost->delay_init = 1;
3233			__ibmvfc_reset_host(vhost);
3234		}
3235		break;
3236	case IBMVFC_AE_SCN_NPORT:
3237	case IBMVFC_AE_SCN_GROUP:
3238		vhost->events_to_log |= IBMVFC_AE_RSCN;
3239		ibmvfc_reinit_host(vhost);
3240		break;
3241	case IBMVFC_AE_ELS_LOGO:
3242	case IBMVFC_AE_ELS_PRLO:
3243	case IBMVFC_AE_ELS_PLOGI:
3244		list_for_each_entry(tgt, &vhost->targets, queue) {
3245			if (!crq->scsi_id && !crq->wwpn && !crq->node_name)
3246				break;
3247			if (crq->scsi_id && cpu_to_be64(tgt->scsi_id) != crq->scsi_id)
3248				continue;
3249			if (crq->wwpn && cpu_to_be64(tgt->ids.port_name) != crq->wwpn)
3250				continue;
3251			if (crq->node_name && cpu_to_be64(tgt->ids.node_name) != crq->node_name)
3252				continue;
3253			if (tgt->need_login && be64_to_cpu(crq->event) == IBMVFC_AE_ELS_LOGO)
3254				tgt->logo_rcvd = 1;
3255			if (!tgt->need_login || be64_to_cpu(crq->event) == IBMVFC_AE_ELS_PLOGI) {
3256				ibmvfc_del_tgt(tgt);
3257				ibmvfc_reinit_host(vhost);
3258			}
3259		}
3260		break;
3261	case IBMVFC_AE_LINK_DOWN:
3262	case IBMVFC_AE_ADAPTER_FAILED:
3263		ibmvfc_link_down(vhost, IBMVFC_LINK_DOWN);
3264		break;
3265	case IBMVFC_AE_LINK_DEAD:
3266		ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
3267		break;
3268	case IBMVFC_AE_HALT:
3269		ibmvfc_link_down(vhost, IBMVFC_HALTED);
3270		break;
3271	default:
3272		dev_err(vhost->dev, "Unknown async event received: %lld\n", crq->event);
3273		break;
3274	}
3275}
3276
3277/**
3278 * ibmvfc_handle_crq - Handles and frees received events in the CRQ
3279 * @crq:	Command/Response queue
3280 * @vhost:	ibmvfc host struct
3281 * @evt_doneq:	Event done queue
3282 *
3283**/
3284static void ibmvfc_handle_crq(struct ibmvfc_crq *crq, struct ibmvfc_host *vhost,
3285			      struct list_head *evt_doneq)
3286{
3287	long rc;
3288	struct ibmvfc_event *evt = (struct ibmvfc_event *)be64_to_cpu(crq->ioba);
3289
3290	switch (crq->valid) {
3291	case IBMVFC_CRQ_INIT_RSP:
3292		switch (crq->format) {
3293		case IBMVFC_CRQ_INIT:
3294			dev_info(vhost->dev, "Partner initialized\n");
3295			/* Send back a response */
3296			rc = ibmvfc_send_crq_init_complete(vhost);
3297			if (rc == 0)
3298				ibmvfc_init_host(vhost);
3299			else
3300				dev_err(vhost->dev, "Unable to send init rsp. rc=%ld\n", rc);
3301			break;
3302		case IBMVFC_CRQ_INIT_COMPLETE:
3303			dev_info(vhost->dev, "Partner initialization complete\n");
3304			ibmvfc_init_host(vhost);
3305			break;
3306		default:
3307			dev_err(vhost->dev, "Unknown crq message type: %d\n", crq->format);
3308		}
3309		return;
3310	case IBMVFC_CRQ_XPORT_EVENT:
3311		vhost->state = IBMVFC_NO_CRQ;
3312		vhost->logged_in = 0;
3313		ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_NONE);
3314		if (crq->format == IBMVFC_PARTITION_MIGRATED) {
3315			/* We need to re-setup the interpartition connection */
3316			dev_info(vhost->dev, "Partition migrated, Re-enabling adapter\n");
3317			vhost->client_migrated = 1;
3318
3319			scsi_block_requests(vhost->host);
3320			ibmvfc_purge_requests(vhost, DID_REQUEUE);
3321			ibmvfc_set_host_state(vhost, IBMVFC_LINK_DOWN);
3322			ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_REENABLE);
3323			wake_up(&vhost->work_wait_q);
3324		} else if (crq->format == IBMVFC_PARTNER_FAILED || crq->format == IBMVFC_PARTNER_DEREGISTER) {
3325			dev_err(vhost->dev, "Host partner adapter deregistered or failed (rc=%d)\n", crq->format);
3326			ibmvfc_purge_requests(vhost, DID_ERROR);
3327			ibmvfc_link_down(vhost, IBMVFC_LINK_DOWN);
3328			ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_RESET);
3329		} else {
3330			dev_err(vhost->dev, "Received unknown transport event from partner (rc=%d)\n", crq->format);
3331		}
3332		return;
3333	case IBMVFC_CRQ_CMD_RSP:
3334		break;
3335	default:
3336		dev_err(vhost->dev, "Got an invalid message type 0x%02x\n", crq->valid);
3337		return;
3338	}
3339
3340	if (crq->format == IBMVFC_ASYNC_EVENT)
3341		return;
3342
3343	/* The only kind of payload CRQs we should get are responses to
3344	 * things we send. Make sure this response is to something we
3345	 * actually sent
3346	 */
3347	if (unlikely(!ibmvfc_valid_event(&vhost->crq.evt_pool, evt))) {
3348		dev_err(vhost->dev, "Returned correlation_token 0x%08llx is invalid!\n",
3349			crq->ioba);
3350		return;
3351	}
3352
3353	if (unlikely(atomic_dec_if_positive(&evt->active))) {
3354		dev_err(vhost->dev, "Received duplicate correlation_token 0x%08llx!\n",
3355			crq->ioba);
3356		return;
3357	}
3358
3359	spin_lock(&evt->queue->l_lock);
3360	list_move_tail(&evt->queue_list, evt_doneq);
3361	spin_unlock(&evt->queue->l_lock);
3362}
3363
3364/**
3365 * ibmvfc_scan_finished - Check if the device scan is done.
3366 * @shost:	scsi host struct
3367 * @time:	current elapsed time
3368 *
3369 * Returns:
3370 *	0 if scan is not done / 1 if scan is done
3371 **/
3372static int ibmvfc_scan_finished(struct Scsi_Host *shost, unsigned long time)
3373{
3374	unsigned long flags;
3375	struct ibmvfc_host *vhost = shost_priv(shost);
3376	int done = 0;
3377
3378	spin_lock_irqsave(shost->host_lock, flags);
3379	if (!vhost->scan_timeout)
3380		done = 1;
3381	else if (time >= (vhost->scan_timeout * HZ)) {
3382		dev_info(vhost->dev, "Scan taking longer than %d seconds, "
3383			 "continuing initialization\n", vhost->scan_timeout);
3384		done = 1;
3385	}
3386
3387	if (vhost->scan_complete) {
3388		vhost->scan_timeout = init_timeout;
3389		done = 1;
3390	}
3391	spin_unlock_irqrestore(shost->host_lock, flags);
3392	return done;
3393}
3394
3395/**
3396 * ibmvfc_sdev_init - Setup the device's task set value
3397 * @sdev:	struct scsi_device device to configure
3398 *
3399 * Set the device's task set value so that error handling works as
3400 * expected.
3401 *
3402 * Returns:
3403 *	0 on success / -ENXIO if device does not exist
3404 **/
3405static int ibmvfc_sdev_init(struct scsi_device *sdev)
3406{
3407	struct Scsi_Host *shost = sdev->host;
3408	struct fc_rport *rport = starget_to_rport(scsi_target(sdev));
3409	struct ibmvfc_host *vhost = shost_priv(shost);
3410	unsigned long flags = 0;
3411
3412	if (!rport || fc_remote_port_chkready(rport))
3413		return -ENXIO;
3414
3415	spin_lock_irqsave(shost->host_lock, flags);
3416	sdev->hostdata = (void *)(unsigned long)vhost->task_set++;
3417	spin_unlock_irqrestore(shost->host_lock, flags);
3418	return 0;
3419}
3420
3421/**
3422 * ibmvfc_target_alloc - Setup the target's task set value
3423 * @starget:	struct scsi_target
3424 *
3425 * Set the target's task set value so that error handling works as
3426 * expected.
3427 *
3428 * Returns:
3429 *	0 on success / -ENXIO if device does not exist
3430 **/
3431static int ibmvfc_target_alloc(struct scsi_target *starget)
3432{
3433	struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
3434	struct ibmvfc_host *vhost = shost_priv(shost);
3435	unsigned long flags = 0;
3436
3437	spin_lock_irqsave(shost->host_lock, flags);
3438	starget->hostdata = (void *)(unsigned long)vhost->task_set++;
3439	spin_unlock_irqrestore(shost->host_lock, flags);
3440	return 0;
3441}
3442
3443/**
3444 * ibmvfc_sdev_configure - Configure the device
3445 * @sdev:	struct scsi_device device to configure
3446 * @lim:	Request queue limits
3447 *
3448 * Enable allow_restart for a device if it is a disk. Adjust the
3449 * queue_depth here also.
3450 *
3451 * Returns:
3452 *	0
3453 **/
3454static int ibmvfc_sdev_configure(struct scsi_device *sdev,
3455				 struct queue_limits *lim)
3456{
3457	struct Scsi_Host *shost = sdev->host;
3458	unsigned long flags = 0;
3459
3460	spin_lock_irqsave(shost->host_lock, flags);
3461	if (sdev->type == TYPE_DISK) {
3462		sdev->allow_restart = 1;
3463		blk_queue_rq_timeout(sdev->request_queue, 120 * HZ);
3464	}
3465	spin_unlock_irqrestore(shost->host_lock, flags);
3466	return 0;
3467}
3468
3469/**
3470 * ibmvfc_change_queue_depth - Change the device's queue depth
3471 * @sdev:	scsi device struct
3472 * @qdepth:	depth to set
3473 *
3474 * Return value:
3475 * 	actual depth set
3476 **/
3477static int ibmvfc_change_queue_depth(struct scsi_device *sdev, int qdepth)
3478{
3479	if (qdepth > IBMVFC_MAX_CMDS_PER_LUN)
3480		qdepth = IBMVFC_MAX_CMDS_PER_LUN;
3481
3482	return scsi_change_queue_depth(sdev, qdepth);
3483}
3484
3485static ssize_t ibmvfc_show_host_partition_name(struct device *dev,
3486						 struct device_attribute *attr, char *buf)
3487{
3488	struct Scsi_Host *shost = class_to_shost(dev);
3489	struct ibmvfc_host *vhost = shost_priv(shost);
3490
3491	return sysfs_emit(buf, "%s\n", vhost->login_buf->resp.partition_name);
3492}
3493
3494static ssize_t ibmvfc_show_host_device_name(struct device *dev,
3495					    struct device_attribute *attr, char *buf)
3496{
3497	struct Scsi_Host *shost = class_to_shost(dev);
3498	struct ibmvfc_host *vhost = shost_priv(shost);
3499
3500	return sysfs_emit(buf, "%s\n", vhost->login_buf->resp.device_name);
3501}
3502
3503static ssize_t ibmvfc_show_host_loc_code(struct device *dev,
3504					 struct device_attribute *attr, char *buf)
3505{
3506	struct Scsi_Host *shost = class_to_shost(dev);
3507	struct ibmvfc_host *vhost = shost_priv(shost);
3508
3509	return sysfs_emit(buf, "%s\n", vhost->login_buf->resp.port_loc_code);
3510}
3511
3512static ssize_t ibmvfc_show_host_drc_name(struct device *dev,
3513					 struct device_attribute *attr, char *buf)
3514{
3515	struct Scsi_Host *shost = class_to_shost(dev);
3516	struct ibmvfc_host *vhost = shost_priv(shost);
3517
3518	return sysfs_emit(buf, "%s\n", vhost->login_buf->resp.drc_name);
3519}
3520
3521static ssize_t ibmvfc_show_host_npiv_version(struct device *dev,
3522					     struct device_attribute *attr, char *buf)
3523{
3524	struct Scsi_Host *shost = class_to_shost(dev);
3525	struct ibmvfc_host *vhost = shost_priv(shost);
3526	return sysfs_emit(buf, "%d\n",
3527			  be32_to_cpu(vhost->login_buf->resp.version));
3528}
3529
3530static ssize_t ibmvfc_show_host_capabilities(struct device *dev,
3531					     struct device_attribute *attr, char *buf)
3532{
3533	struct Scsi_Host *shost = class_to_shost(dev);
3534	struct ibmvfc_host *vhost = shost_priv(shost);
3535	return sysfs_emit(buf, "%llx\n",
3536			  be64_to_cpu(vhost->login_buf->resp.capabilities));
3537}
3538
3539/**
3540 * ibmvfc_show_log_level - Show the adapter's error logging level
3541 * @dev:	class device struct
3542 * @attr:	unused
3543 * @buf:	buffer
3544 *
3545 * Return value:
3546 * 	number of bytes printed to buffer
3547 **/
3548static ssize_t ibmvfc_show_log_level(struct device *dev,
3549				     struct device_attribute *attr, char *buf)
3550{
3551	struct Scsi_Host *shost = class_to_shost(dev);
3552	struct ibmvfc_host *vhost = shost_priv(shost);
3553	unsigned long flags = 0;
3554	int len;
3555
3556	spin_lock_irqsave(shost->host_lock, flags);
3557	len = sysfs_emit(buf, "%d\n", vhost->log_level);
3558	spin_unlock_irqrestore(shost->host_lock, flags);
3559	return len;
3560}
3561
3562/**
3563 * ibmvfc_store_log_level - Change the adapter's error logging level
3564 * @dev:	class device struct
3565 * @attr:	unused
3566 * @buf:	buffer
3567 * @count:      buffer size
3568 *
3569 * Return value:
3570 * 	number of bytes printed to buffer
3571 **/
3572static ssize_t ibmvfc_store_log_level(struct device *dev,
3573				      struct device_attribute *attr,
3574				      const char *buf, size_t count)
3575{
3576	struct Scsi_Host *shost = class_to_shost(dev);
3577	struct ibmvfc_host *vhost = shost_priv(shost);
3578	unsigned long flags = 0;
3579
3580	spin_lock_irqsave(shost->host_lock, flags);
3581	vhost->log_level = simple_strtoul(buf, NULL, 10);
3582	spin_unlock_irqrestore(shost->host_lock, flags);
3583	return strlen(buf);
3584}
3585
3586static ssize_t ibmvfc_show_scsi_channels(struct device *dev,
3587					 struct device_attribute *attr, char *buf)
3588{
3589	struct Scsi_Host *shost = class_to_shost(dev);
3590	struct ibmvfc_host *vhost = shost_priv(shost);
3591	struct ibmvfc_channels *scsi = &vhost->scsi_scrqs;
3592	unsigned long flags = 0;
3593	int len;
3594
3595	spin_lock_irqsave(shost->host_lock, flags);
3596	len = sysfs_emit(buf, "%d\n", scsi->desired_queues);
3597	spin_unlock_irqrestore(shost->host_lock, flags);
3598	return len;
3599}
3600
3601static ssize_t ibmvfc_store_scsi_channels(struct device *dev,
3602					 struct device_attribute *attr,
3603					 const char *buf, size_t count)
3604{
3605	struct Scsi_Host *shost = class_to_shost(dev);
3606	struct ibmvfc_host *vhost = shost_priv(shost);
3607	struct ibmvfc_channels *scsi = &vhost->scsi_scrqs;
3608	unsigned long flags = 0;
3609	unsigned int channels;
3610
3611	spin_lock_irqsave(shost->host_lock, flags);
3612	channels = simple_strtoul(buf, NULL, 10);
3613	scsi->desired_queues = min(channels, shost->nr_hw_queues);
3614	ibmvfc_hard_reset_host(vhost);
3615	spin_unlock_irqrestore(shost->host_lock, flags);
3616	return strlen(buf);
3617}
3618
3619static DEVICE_ATTR(partition_name, S_IRUGO, ibmvfc_show_host_partition_name, NULL);
3620static DEVICE_ATTR(device_name, S_IRUGO, ibmvfc_show_host_device_name, NULL);
3621static DEVICE_ATTR(port_loc_code, S_IRUGO, ibmvfc_show_host_loc_code, NULL);
3622static DEVICE_ATTR(drc_name, S_IRUGO, ibmvfc_show_host_drc_name, NULL);
3623static DEVICE_ATTR(npiv_version, S_IRUGO, ibmvfc_show_host_npiv_version, NULL);
3624static DEVICE_ATTR(capabilities, S_IRUGO, ibmvfc_show_host_capabilities, NULL);
3625static DEVICE_ATTR(log_level, S_IRUGO | S_IWUSR,
3626		   ibmvfc_show_log_level, ibmvfc_store_log_level);
3627static DEVICE_ATTR(nr_scsi_channels, S_IRUGO | S_IWUSR,
3628		   ibmvfc_show_scsi_channels, ibmvfc_store_scsi_channels);
3629
3630#ifdef CONFIG_SCSI_IBMVFC_TRACE
3631/**
3632 * ibmvfc_read_trace - Dump the adapter trace
3633 * @filp:		open sysfs file
3634 * @kobj:		kobject struct
3635 * @bin_attr:	bin_attribute struct
3636 * @buf:		buffer
3637 * @off:		offset
3638 * @count:		buffer size
3639 *
3640 * Return value:
3641 *	number of bytes printed to buffer
3642 **/
3643static ssize_t ibmvfc_read_trace(struct file *filp, struct kobject *kobj,
3644				 const struct bin_attribute *bin_attr,
3645				 char *buf, loff_t off, size_t count)
3646{
3647	struct device *dev = kobj_to_dev(kobj);
3648	struct Scsi_Host *shost = class_to_shost(dev);
3649	struct ibmvfc_host *vhost = shost_priv(shost);
3650	unsigned long flags = 0;
3651	int size = IBMVFC_TRACE_SIZE;
3652	char *src = (char *)vhost->trace;
3653
3654	if (off > size)
3655		return 0;
3656	if (off + count > size) {
3657		size -= off;
3658		count = size;
3659	}
3660
3661	spin_lock_irqsave(shost->host_lock, flags);
3662	memcpy(buf, &src[off], count);
3663	spin_unlock_irqrestore(shost->host_lock, flags);
3664	return count;
3665}
3666
3667static const struct bin_attribute ibmvfc_trace_attr = {
3668	.attr =	{
3669		.name = "trace",
3670		.mode = S_IRUGO,
3671	},
3672	.size = 0,
3673	.read = ibmvfc_read_trace,
3674};
3675#endif
3676
3677static struct attribute *ibmvfc_host_attrs[] = {
3678	&dev_attr_partition_name.attr,
3679	&dev_attr_device_name.attr,
3680	&dev_attr_port_loc_code.attr,
3681	&dev_attr_drc_name.attr,
3682	&dev_attr_npiv_version.attr,
3683	&dev_attr_capabilities.attr,
3684	&dev_attr_log_level.attr,
3685	&dev_attr_nr_scsi_channels.attr,
3686	NULL
3687};
3688
3689ATTRIBUTE_GROUPS(ibmvfc_host);
3690
3691static const struct scsi_host_template driver_template = {
3692	.module = THIS_MODULE,
3693	.name = "IBM POWER Virtual FC Adapter",
3694	.proc_name = IBMVFC_NAME,
3695	.queuecommand = ibmvfc_queuecommand,
3696	.eh_timed_out = fc_eh_timed_out,
3697	.eh_abort_handler = ibmvfc_eh_abort_handler,
3698	.eh_device_reset_handler = ibmvfc_eh_device_reset_handler,
3699	.eh_target_reset_handler = ibmvfc_eh_target_reset_handler,
3700	.eh_host_reset_handler = ibmvfc_eh_host_reset_handler,
3701	.sdev_init = ibmvfc_sdev_init,
3702	.sdev_configure = ibmvfc_sdev_configure,
3703	.target_alloc = ibmvfc_target_alloc,
3704	.scan_finished = ibmvfc_scan_finished,
3705	.change_queue_depth = ibmvfc_change_queue_depth,
3706	.cmd_per_lun = 16,
3707	.can_queue = IBMVFC_MAX_REQUESTS_DEFAULT,
3708	.this_id = -1,
3709	.sg_tablesize = SG_ALL,
3710	.max_sectors = IBMVFC_MAX_SECTORS,
3711	.shost_groups = ibmvfc_host_groups,
3712	.track_queue_depth = 1,
3713};
3714
3715/**
3716 * ibmvfc_next_async_crq - Returns the next entry in async queue
3717 * @vhost:	ibmvfc host struct
3718 *
3719 * Returns:
3720 *	Pointer to next entry in queue / NULL if empty
3721 **/
3722static struct ibmvfc_async_crq *ibmvfc_next_async_crq(struct ibmvfc_host *vhost)
3723{
3724	struct ibmvfc_queue *async_crq = &vhost->async_crq;
3725	struct ibmvfc_async_crq *crq;
3726
3727	crq = &async_crq->msgs.async[async_crq->cur];
3728	if (crq->valid & 0x80) {
3729		if (++async_crq->cur == async_crq->size)
3730			async_crq->cur = 0;
3731		rmb();
3732	} else
3733		crq = NULL;
3734
3735	return crq;
3736}
3737
3738/**
3739 * ibmvfc_next_crq - Returns the next entry in message queue
3740 * @vhost:	ibmvfc host struct
3741 *
3742 * Returns:
3743 *	Pointer to next entry in queue / NULL if empty
3744 **/
3745static struct ibmvfc_crq *ibmvfc_next_crq(struct ibmvfc_host *vhost)
3746{
3747	struct ibmvfc_queue *queue = &vhost->crq;
3748	struct ibmvfc_crq *crq;
3749
3750	crq = &queue->msgs.crq[queue->cur];
3751	if (crq->valid & 0x80) {
3752		if (++queue->cur == queue->size)
3753			queue->cur = 0;
3754		rmb();
3755	} else
3756		crq = NULL;
3757
3758	return crq;
3759}
3760
3761/**
3762 * ibmvfc_interrupt - Interrupt handler
3763 * @irq:		number of irq to handle, not used
3764 * @dev_instance: ibmvfc_host that received interrupt
3765 *
3766 * Returns:
3767 *	IRQ_HANDLED
3768 **/
3769static irqreturn_t ibmvfc_interrupt(int irq, void *dev_instance)
3770{
3771	struct ibmvfc_host *vhost = (struct ibmvfc_host *)dev_instance;
3772	unsigned long flags;
3773
3774	spin_lock_irqsave(vhost->host->host_lock, flags);
3775	vio_disable_interrupts(to_vio_dev(vhost->dev));
3776	tasklet_schedule(&vhost->tasklet);
3777	spin_unlock_irqrestore(vhost->host->host_lock, flags);
3778	return IRQ_HANDLED;
3779}
3780
3781/**
3782 * ibmvfc_tasklet - Interrupt handler tasklet
3783 * @data:		ibmvfc host struct
3784 *
3785 * Returns:
3786 *	Nothing
3787 **/
3788static void ibmvfc_tasklet(void *data)
3789{
3790	struct ibmvfc_host *vhost = data;
3791	struct vio_dev *vdev = to_vio_dev(vhost->dev);
3792	struct ibmvfc_crq *crq;
3793	struct ibmvfc_async_crq *async;
3794	struct ibmvfc_event *evt, *temp;
3795	unsigned long flags;
3796	int done = 0;
3797	LIST_HEAD(evt_doneq);
3798
3799	spin_lock_irqsave(vhost->host->host_lock, flags);
3800	spin_lock(vhost->crq.q_lock);
3801	while (!done) {
3802		/* Pull all the valid messages off the async CRQ */
3803		while ((async = ibmvfc_next_async_crq(vhost)) != NULL) {
3804			ibmvfc_handle_async(async, vhost);
3805			async->valid = 0;
3806			wmb();
3807		}
3808
3809		/* Pull all the valid messages off the CRQ */
3810		while ((crq = ibmvfc_next_crq(vhost)) != NULL) {
3811			ibmvfc_handle_crq(crq, vhost, &evt_doneq);
3812			crq->valid = 0;
3813			wmb();
3814		}
3815
3816		vio_enable_interrupts(vdev);
3817		if ((async = ibmvfc_next_async_crq(vhost)) != NULL) {
3818			vio_disable_interrupts(vdev);
3819			ibmvfc_handle_async(async, vhost);
3820			async->valid = 0;
3821			wmb();
3822		} else if ((crq = ibmvfc_next_crq(vhost)) != NULL) {
3823			vio_disable_interrupts(vdev);
3824			ibmvfc_handle_crq(crq, vhost, &evt_doneq);
3825			crq->valid = 0;
3826			wmb();
3827		} else
3828			done = 1;
3829	}
3830
3831	spin_unlock(vhost->crq.q_lock);
3832	spin_unlock_irqrestore(vhost->host->host_lock, flags);
3833
3834	list_for_each_entry_safe(evt, temp, &evt_doneq, queue_list) {
3835		timer_delete(&evt->timer);
3836		list_del(&evt->queue_list);
3837		ibmvfc_trc_end(evt);
3838		evt->done(evt);
3839	}
3840}
3841
3842static int ibmvfc_toggle_scrq_irq(struct ibmvfc_queue *scrq, int enable)
3843{
3844	struct device *dev = scrq->vhost->dev;
3845	struct vio_dev *vdev = to_vio_dev(dev);
3846	unsigned long rc;
3847	int irq_action = H_ENABLE_VIO_INTERRUPT;
3848
3849	if (!enable)
3850		irq_action = H_DISABLE_VIO_INTERRUPT;
3851
3852	rc = plpar_hcall_norets(H_VIOCTL, vdev->unit_address, irq_action,
3853				scrq->hw_irq, 0, 0);
3854
3855	if (rc)
3856		dev_err(dev, "Couldn't %s sub-crq[%lu] irq. rc=%ld\n",
3857			enable ? "enable" : "disable", scrq->hwq_id, rc);
3858
3859	return rc;
3860}
3861
3862static void ibmvfc_handle_scrq(struct ibmvfc_crq *crq, struct ibmvfc_host *vhost,
3863			       struct list_head *evt_doneq)
3864{
3865	struct ibmvfc_event *evt = (struct ibmvfc_event *)be64_to_cpu(crq->ioba);
3866
3867	switch (crq->valid) {
3868	case IBMVFC_CRQ_CMD_RSP:
3869		break;
3870	case IBMVFC_CRQ_XPORT_EVENT:
3871		return;
3872	default:
3873		dev_err(vhost->dev, "Got and invalid message type 0x%02x\n", crq->valid);
3874		return;
3875	}
3876
3877	/* The only kind of payload CRQs we should get are responses to
3878	 * things we send. Make sure this response is to something we
3879	 * actually sent
3880	 */
3881	if (unlikely(!ibmvfc_valid_event(&evt->queue->evt_pool, evt))) {
3882		dev_err(vhost->dev, "Returned correlation_token 0x%08llx is invalid!\n",
3883			crq->ioba);
3884		return;
3885	}
3886
3887	if (unlikely(atomic_dec_if_positive(&evt->active))) {
3888		dev_err(vhost->dev, "Received duplicate correlation_token 0x%08llx!\n",
3889			crq->ioba);
3890		return;
3891	}
3892
3893	spin_lock(&evt->queue->l_lock);
3894	list_move_tail(&evt->queue_list, evt_doneq);
3895	spin_unlock(&evt->queue->l_lock);
3896}
3897
3898static struct ibmvfc_crq *ibmvfc_next_scrq(struct ibmvfc_queue *scrq)
3899{
3900	struct ibmvfc_crq *crq;
3901
3902	crq = &scrq->msgs.scrq[scrq->cur].crq;
3903	if (crq->valid & 0x80) {
3904		if (++scrq->cur == scrq->size)
3905			scrq->cur = 0;
3906		rmb();
3907	} else
3908		crq = NULL;
3909
3910	return crq;
3911}
3912
3913static void ibmvfc_drain_sub_crq(struct ibmvfc_queue *scrq)
3914{
3915	struct ibmvfc_crq *crq;
3916	struct ibmvfc_event *evt, *temp;
3917	unsigned long flags;
3918	int done = 0;
3919	LIST_HEAD(evt_doneq);
3920
3921	spin_lock_irqsave(scrq->q_lock, flags);
3922	while (!done) {
3923		while ((crq = ibmvfc_next_scrq(scrq)) != NULL) {
3924			ibmvfc_handle_scrq(crq, scrq->vhost, &evt_doneq);
3925			crq->valid = 0;
3926			wmb();
3927		}
3928
3929		ibmvfc_toggle_scrq_irq(scrq, 1);
3930		if ((crq = ibmvfc_next_scrq(scrq)) != NULL) {
3931			ibmvfc_toggle_scrq_irq(scrq, 0);
3932			ibmvfc_handle_scrq(crq, scrq->vhost, &evt_doneq);
3933			crq->valid = 0;
3934			wmb();
3935		} else
3936			done = 1;
3937	}
3938	spin_unlock_irqrestore(scrq->q_lock, flags);
3939
3940	list_for_each_entry_safe(evt, temp, &evt_doneq, queue_list) {
3941		timer_delete(&evt->timer);
3942		list_del(&evt->queue_list);
3943		ibmvfc_trc_end(evt);
3944		evt->done(evt);
3945	}
3946}
3947
3948static irqreturn_t ibmvfc_interrupt_mq(int irq, void *scrq_instance)
3949{
3950	struct ibmvfc_queue *scrq = (struct ibmvfc_queue *)scrq_instance;
3951
3952	ibmvfc_toggle_scrq_irq(scrq, 0);
3953	ibmvfc_drain_sub_crq(scrq);
3954
3955	return IRQ_HANDLED;
3956}
3957
3958/**
3959 * ibmvfc_init_tgt - Set the next init job step for the target
3960 * @tgt:		ibmvfc target struct
3961 * @job_step:	job step to perform
3962 *
3963 **/
3964static void ibmvfc_init_tgt(struct ibmvfc_target *tgt,
3965			    void (*job_step) (struct ibmvfc_target *))
3966{
3967	if (!ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_INIT))
3968		tgt->job_step = job_step;
3969	wake_up(&tgt->vhost->work_wait_q);
3970}
3971
3972/**
3973 * ibmvfc_retry_tgt_init - Attempt to retry a step in target initialization
3974 * @tgt:		ibmvfc target struct
3975 * @job_step:	initialization job step
3976 *
3977 * Returns: 1 if step will be retried / 0 if not
3978 *
3979 **/
3980static int ibmvfc_retry_tgt_init(struct ibmvfc_target *tgt,
3981				  void (*job_step) (struct ibmvfc_target *))
3982{
3983	if (++tgt->init_retries > IBMVFC_MAX_TGT_INIT_RETRIES) {
3984		ibmvfc_del_tgt(tgt);
3985		wake_up(&tgt->vhost->work_wait_q);
3986		return 0;
3987	} else
3988		ibmvfc_init_tgt(tgt, job_step);
3989	return 1;
3990}
3991
3992/* Defined in FC-LS */
3993static const struct {
3994	int code;
3995	int retry;
3996	int logged_in;
3997} prli_rsp [] = {
3998	{ 0, 1, 0 },
3999	{ 1, 0, 1 },
4000	{ 2, 1, 0 },
4001	{ 3, 1, 0 },
4002	{ 4, 0, 0 },
4003	{ 5, 0, 0 },
4004	{ 6, 0, 1 },
4005	{ 7, 0, 0 },
4006	{ 8, 1, 0 },
4007};
4008
4009/**
4010 * ibmvfc_get_prli_rsp - Find PRLI response index
4011 * @flags:	PRLI response flags
4012 *
4013 **/
4014static int ibmvfc_get_prli_rsp(u16 flags)
4015{
4016	int i;
4017	int code = (flags & 0x0f00) >> 8;
4018
4019	for (i = 0; i < ARRAY_SIZE(prli_rsp); i++)
4020		if (prli_rsp[i].code == code)
4021			return i;
4022
4023	return 0;
4024}
4025
4026/**
4027 * ibmvfc_tgt_prli_done - Completion handler for Process Login
4028 * @evt:	ibmvfc event struct
4029 *
4030 **/
4031static void ibmvfc_tgt_prli_done(struct ibmvfc_event *evt)
4032{
4033	struct ibmvfc_target *tgt = evt->tgt;
4034	struct ibmvfc_host *vhost = evt->vhost;
4035	struct ibmvfc_process_login *rsp = &evt->xfer_iu->prli;
4036	struct ibmvfc_prli_svc_parms *parms = &rsp->parms;
4037	u32 status = be16_to_cpu(rsp->common.status);
4038	int index, level = IBMVFC_DEFAULT_LOG_LEVEL;
4039
4040	vhost->discovery_threads--;
4041	ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE);
4042	switch (status) {
4043	case IBMVFC_MAD_SUCCESS:
4044		tgt_dbg(tgt, "Process Login succeeded: %X %02X %04X\n",
4045			parms->type, parms->flags, parms->service_parms);
4046
4047		if (parms->type == IBMVFC_SCSI_FCP_TYPE) {
4048			index = ibmvfc_get_prli_rsp(be16_to_cpu(parms->flags));
4049			if (prli_rsp[index].logged_in) {
4050				if (be16_to_cpu(parms->flags) & IBMVFC_PRLI_EST_IMG_PAIR) {
4051					tgt->need_login = 0;
4052					tgt->ids.roles = 0;
4053					if (be32_to_cpu(parms->service_parms) & IBMVFC_PRLI_TARGET_FUNC)
4054						tgt->ids.roles |= FC_PORT_ROLE_FCP_TARGET;
4055					if (be32_to_cpu(parms->service_parms) & IBMVFC_PRLI_INITIATOR_FUNC)
4056						tgt->ids.roles |= FC_PORT_ROLE_FCP_INITIATOR;
4057					tgt->add_rport = 1;
4058				} else
4059					ibmvfc_del_tgt(tgt);
4060			} else if (prli_rsp[index].retry)
4061				ibmvfc_retry_tgt_init(tgt, ibmvfc_tgt_send_prli);
4062			else
4063				ibmvfc_del_tgt(tgt);
4064		} else
4065			ibmvfc_del_tgt(tgt);
4066		break;
4067	case IBMVFC_MAD_DRIVER_FAILED:
4068		break;
4069	case IBMVFC_MAD_CRQ_ERROR:
4070		ibmvfc_retry_tgt_init(tgt, ibmvfc_tgt_send_prli);
4071		break;
4072	case IBMVFC_MAD_FAILED:
4073	default:
4074		if ((be16_to_cpu(rsp->status) & IBMVFC_VIOS_FAILURE) &&
4075		     be16_to_cpu(rsp->error) == IBMVFC_PLOGI_REQUIRED)
4076			level += ibmvfc_retry_tgt_init(tgt, ibmvfc_tgt_send_plogi);
4077		else if (tgt->logo_rcvd)
4078			level += ibmvfc_retry_tgt_init(tgt, ibmvfc_tgt_send_plogi);
4079		else if (ibmvfc_retry_cmd(be16_to_cpu(rsp->status), be16_to_cpu(rsp->error)))
4080			level += ibmvfc_retry_tgt_init(tgt, ibmvfc_tgt_send_prli);
4081		else
4082			ibmvfc_del_tgt(tgt);
4083
4084		tgt_log(tgt, level, "Process Login failed: %s (%x:%x) rc=0x%02X\n",
4085			ibmvfc_get_cmd_error(be16_to_cpu(rsp->status), be16_to_cpu(rsp->error)),
4086			be16_to_cpu(rsp->status), be16_to_cpu(rsp->error), status);
4087		break;
4088	}
4089
4090	kref_put(&tgt->kref, ibmvfc_release_tgt);
4091	ibmvfc_free_event(evt);
4092	wake_up(&vhost->work_wait_q);
4093}
4094
4095/**
4096 * ibmvfc_tgt_send_prli - Send a process login
4097 * @tgt:	ibmvfc target struct
4098 *
4099 **/
4100static void ibmvfc_tgt_send_prli(struct ibmvfc_target *tgt)
4101{
4102	struct ibmvfc_process_login *prli;
4103	struct ibmvfc_host *vhost = tgt->vhost;
4104	struct ibmvfc_event *evt;
4105
4106	if (vhost->discovery_threads >= disc_threads)
4107		return;
4108
4109	kref_get(&tgt->kref);
4110	evt = ibmvfc_get_reserved_event(&vhost->crq);
4111	if (!evt) {
4112		ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE);
4113		kref_put(&tgt->kref, ibmvfc_release_tgt);
4114		__ibmvfc_reset_host(vhost);
4115		return;
4116	}
4117	vhost->discovery_threads++;
4118	ibmvfc_init_event(evt, ibmvfc_tgt_prli_done, IBMVFC_MAD_FORMAT);
4119	evt->tgt = tgt;
4120	prli = &evt->iu.prli;
4121	memset(prli, 0, sizeof(*prli));
4122	if (ibmvfc_check_caps(vhost, IBMVFC_HANDLE_VF_WWPN)) {
4123		prli->common.version = cpu_to_be32(2);
4124		prli->target_wwpn = cpu_to_be64(tgt->wwpn);
4125	} else {
4126		prli->common.version = cpu_to_be32(1);
4127	}
4128	prli->common.opcode = cpu_to_be32(IBMVFC_PROCESS_LOGIN);
4129	prli->common.length = cpu_to_be16(sizeof(*prli));
4130	prli->scsi_id = cpu_to_be64(tgt->scsi_id);
4131
4132	prli->parms.type = IBMVFC_SCSI_FCP_TYPE;
4133	prli->parms.flags = cpu_to_be16(IBMVFC_PRLI_EST_IMG_PAIR);
4134	prli->parms.service_parms = cpu_to_be32(IBMVFC_PRLI_INITIATOR_FUNC);
4135	prli->parms.service_parms |= cpu_to_be32(IBMVFC_PRLI_READ_FCP_XFER_RDY_DISABLED);
4136
4137	if (cls3_error)
4138		prli->parms.service_parms |= cpu_to_be32(IBMVFC_PRLI_RETRY);
4139
4140	ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_INIT_WAIT);
4141	if (ibmvfc_send_event(evt, vhost, default_timeout)) {
4142		vhost->discovery_threads--;
4143		ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE);
4144		kref_put(&tgt->kref, ibmvfc_release_tgt);
4145	} else
4146		tgt_dbg(tgt, "Sent process login\n");
4147}
4148
4149/**
4150 * ibmvfc_tgt_plogi_done - Completion handler for Port Login
4151 * @evt:	ibmvfc event struct
4152 *
4153 **/
4154static void ibmvfc_tgt_plogi_done(struct ibmvfc_event *evt)
4155{
4156	struct ibmvfc_target *tgt = evt->tgt;
4157	struct ibmvfc_host *vhost = evt->vhost;
4158	struct ibmvfc_port_login *rsp = &evt->xfer_iu->plogi;
4159	u32 status = be16_to_cpu(rsp->common.status);
4160	int level = IBMVFC_DEFAULT_LOG_LEVEL;
4161
4162	vhost->discovery_threads--;
4163	ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE);
4164	switch (status) {
4165	case IBMVFC_MAD_SUCCESS:
4166		tgt_dbg(tgt, "Port Login succeeded\n");
4167		if (tgt->ids.port_name &&
4168		    tgt->ids.port_name != wwn_to_u64(rsp->service_parms.port_name)) {
4169			vhost->reinit = 1;
4170			tgt_dbg(tgt, "Port re-init required\n");
4171			break;
4172		}
4173		tgt->ids.node_name = wwn_to_u64(rsp->service_parms.node_name);
4174		tgt->ids.port_name = wwn_to_u64(rsp->service_parms.port_name);
4175		tgt->ids.port_id = tgt->scsi_id;
4176		memcpy(&tgt->service_parms, &rsp->service_parms,
4177		       sizeof(tgt->service_parms));
4178		memcpy(&tgt->service_parms_change, &rsp->service_parms_change,
4179		       sizeof(tgt->service_parms_change));
4180		ibmvfc_init_tgt(tgt, ibmvfc_tgt_send_prli);
4181		break;
4182	case IBMVFC_MAD_DRIVER_FAILED:
4183		break;
4184	case IBMVFC_MAD_CRQ_ERROR:
4185		ibmvfc_retry_tgt_init(tgt, ibmvfc_tgt_send_plogi);
4186		break;
4187	case IBMVFC_MAD_FAILED:
4188	default:
4189		if (ibmvfc_retry_cmd(be16_to_cpu(rsp->status), be16_to_cpu(rsp->error)))
4190			level += ibmvfc_retry_tgt_init(tgt, ibmvfc_tgt_send_plogi);
4191		else
4192			ibmvfc_del_tgt(tgt);
4193
4194		tgt_log(tgt, level, "Port Login failed: %s (%x:%x) %s (%x) %s (%x) rc=0x%02X\n",
4195			ibmvfc_get_cmd_error(be16_to_cpu(rsp->status), be16_to_cpu(rsp->error)),
4196					     be16_to_cpu(rsp->status), be16_to_cpu(rsp->error),
4197			ibmvfc_get_fc_type(be16_to_cpu(rsp->fc_type)), be16_to_cpu(rsp->fc_type),
4198			ibmvfc_get_ls_explain(be16_to_cpu(rsp->fc_explain)), be16_to_cpu(rsp->fc_explain), status);
4199		break;
4200	}
4201
4202	kref_put(&tgt->kref, ibmvfc_release_tgt);
4203	ibmvfc_free_event(evt);
4204	wake_up(&vhost->work_wait_q);
4205}
4206
4207/**
4208 * ibmvfc_tgt_send_plogi - Send PLOGI to the specified target
4209 * @tgt:	ibmvfc target struct
4210 *
4211 **/
4212static void ibmvfc_tgt_send_plogi(struct ibmvfc_target *tgt)
4213{
4214	struct ibmvfc_port_login *plogi;
4215	struct ibmvfc_host *vhost = tgt->vhost;
4216	struct ibmvfc_event *evt;
4217
4218	if (vhost->discovery_threads >= disc_threads)
4219		return;
4220
4221	kref_get(&tgt->kref);
4222	tgt->logo_rcvd = 0;
4223	evt = ibmvfc_get_reserved_event(&vhost->crq);
4224	if (!evt) {
4225		ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE);
4226		kref_put(&tgt->kref, ibmvfc_release_tgt);
4227		__ibmvfc_reset_host(vhost);
4228		return;
4229	}
4230	vhost->discovery_threads++;
4231	ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_INIT_WAIT);
4232	ibmvfc_init_event(evt, ibmvfc_tgt_plogi_done, IBMVFC_MAD_FORMAT);
4233	evt->tgt = tgt;
4234	plogi = &evt->iu.plogi;
4235	memset(plogi, 0, sizeof(*plogi));
4236	if (ibmvfc_check_caps(vhost, IBMVFC_HANDLE_VF_WWPN)) {
4237		plogi->common.version = cpu_to_be32(2);
4238		plogi->target_wwpn = cpu_to_be64(tgt->wwpn);
4239	} else {
4240		plogi->common.version = cpu_to_be32(1);
4241	}
4242	plogi->common.opcode = cpu_to_be32(IBMVFC_PORT_LOGIN);
4243	plogi->common.length = cpu_to_be16(sizeof(*plogi));
4244	plogi->scsi_id = cpu_to_be64(tgt->scsi_id);
4245
4246	if (ibmvfc_send_event(evt, vhost, default_timeout)) {
4247		vhost->discovery_threads--;
4248		ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE);
4249		kref_put(&tgt->kref, ibmvfc_release_tgt);
4250	} else
4251		tgt_dbg(tgt, "Sent port login\n");
4252}
4253
4254/**
4255 * ibmvfc_tgt_implicit_logout_done - Completion handler for Implicit Logout MAD
4256 * @evt:	ibmvfc event struct
4257 *
4258 **/
4259static void ibmvfc_tgt_implicit_logout_done(struct ibmvfc_event *evt)
4260{
4261	struct ibmvfc_target *tgt = evt->tgt;
4262	struct ibmvfc_host *vhost = evt->vhost;
4263	struct ibmvfc_implicit_logout *rsp = &evt->xfer_iu->implicit_logout;
4264	u32 status = be16_to_cpu(rsp->common.status);
4265
4266	vhost->discovery_threads--;
4267	ibmvfc_free_event(evt);
4268	ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE);
4269
4270	switch (status) {
4271	case IBMVFC_MAD_SUCCESS:
4272		tgt_dbg(tgt, "Implicit Logout succeeded\n");
4273		break;
4274	case IBMVFC_MAD_DRIVER_FAILED:
4275		kref_put(&tgt->kref, ibmvfc_release_tgt);
4276		wake_up(&vhost->work_wait_q);
4277		return;
4278	case IBMVFC_MAD_FAILED:
4279	default:
4280		tgt_err(tgt, "Implicit Logout failed: rc=0x%02X\n", status);
4281		break;
4282	}
4283
4284	ibmvfc_init_tgt(tgt, ibmvfc_tgt_send_plogi);
4285	kref_put(&tgt->kref, ibmvfc_release_tgt);
4286	wake_up(&vhost->work_wait_q);
4287}
4288
4289/**
4290 * __ibmvfc_tgt_get_implicit_logout_evt - Allocate and init an event for implicit logout
4291 * @tgt:		ibmvfc target struct
4292 * @done:		Routine to call when the event is responded to
4293 *
4294 * Returns:
4295 *	Allocated and initialized ibmvfc_event struct
4296 **/
4297static struct ibmvfc_event *__ibmvfc_tgt_get_implicit_logout_evt(struct ibmvfc_target *tgt,
4298								 void (*done) (struct ibmvfc_event *))
4299{
4300	struct ibmvfc_implicit_logout *mad;
4301	struct ibmvfc_host *vhost = tgt->vhost;
4302	struct ibmvfc_event *evt;
4303
4304	kref_get(&tgt->kref);
4305	evt = ibmvfc_get_reserved_event(&vhost->crq);
4306	if (!evt)
4307		return NULL;
4308	ibmvfc_init_event(evt, done, IBMVFC_MAD_FORMAT);
4309	evt->tgt = tgt;
4310	mad = &evt->iu.implicit_logout;
4311	memset(mad, 0, sizeof(*mad));
4312	mad->common.version = cpu_to_be32(1);
4313	mad->common.opcode = cpu_to_be32(IBMVFC_IMPLICIT_LOGOUT);
4314	mad->common.length = cpu_to_be16(sizeof(*mad));
4315	mad->old_scsi_id = cpu_to_be64(tgt->scsi_id);
4316	return evt;
4317}
4318
4319/**
4320 * ibmvfc_tgt_implicit_logout - Initiate an Implicit Logout for specified target
4321 * @tgt:		ibmvfc target struct
4322 *
4323 **/
4324static void ibmvfc_tgt_implicit_logout(struct ibmvfc_target *tgt)
4325{
4326	struct ibmvfc_host *vhost = tgt->vhost;
4327	struct ibmvfc_event *evt;
4328
4329	if (vhost->discovery_threads >= disc_threads)
4330		return;
4331
4332	vhost->discovery_threads++;
4333	evt = __ibmvfc_tgt_get_implicit_logout_evt(tgt,
4334						   ibmvfc_tgt_implicit_logout_done);
4335	if (!evt) {
4336		vhost->discovery_threads--;
4337		ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE);
4338		kref_put(&tgt->kref, ibmvfc_release_tgt);
4339		__ibmvfc_reset_host(vhost);
4340		return;
4341	}
4342
4343	ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_INIT_WAIT);
4344	if (ibmvfc_send_event(evt, vhost, default_timeout)) {
4345		vhost->discovery_threads--;
4346		ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE);
4347		kref_put(&tgt->kref, ibmvfc_release_tgt);
4348	} else
4349		tgt_dbg(tgt, "Sent Implicit Logout\n");
4350}
4351
4352/**
4353 * ibmvfc_tgt_implicit_logout_and_del_done - Completion handler for Implicit Logout MAD
4354 * @evt:	ibmvfc event struct
4355 *
4356 **/
4357static void ibmvfc_tgt_implicit_logout_and_del_done(struct ibmvfc_event *evt)
4358{
4359	struct ibmvfc_target *tgt = evt->tgt;
4360	struct ibmvfc_host *vhost = evt->vhost;
4361	struct ibmvfc_passthru_mad *mad = &evt->xfer_iu->passthru;
4362	u32 status = be16_to_cpu(mad->common.status);
4363
4364	vhost->discovery_threads--;
4365	ibmvfc_free_event(evt);
4366
4367	/*
4368	 * If our state is IBMVFC_HOST_OFFLINE, we could be unloading the
4369	 * driver in which case we need to free up all the targets. If we are
4370	 * not unloading, we will still go through a hard reset to get out of
4371	 * offline state, so there is no need to track the old targets in that
4372	 * case.
4373	 */
4374	if (status == IBMVFC_MAD_SUCCESS || vhost->state == IBMVFC_HOST_OFFLINE)
4375		ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT);
4376	else
4377		ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_AND_LOGOUT_RPORT);
4378
4379	tgt_dbg(tgt, "Implicit Logout %s\n", (status == IBMVFC_MAD_SUCCESS) ? "succeeded" : "failed");
4380	kref_put(&tgt->kref, ibmvfc_release_tgt);
4381	wake_up(&vhost->work_wait_q);
4382}
4383
4384/**
4385 * ibmvfc_tgt_implicit_logout_and_del - Initiate an Implicit Logout for specified target
4386 * @tgt:		ibmvfc target struct
4387 *
4388 **/
4389static void ibmvfc_tgt_implicit_logout_and_del(struct ibmvfc_target *tgt)
4390{
4391	struct ibmvfc_host *vhost = tgt->vhost;
4392	struct ibmvfc_event *evt;
4393
4394	if (!vhost->logged_in) {
4395		ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT);
4396		return;
4397	}
4398
4399	if (vhost->discovery_threads >= disc_threads)
4400		return;
4401
4402	vhost->discovery_threads++;
4403	evt = __ibmvfc_tgt_get_implicit_logout_evt(tgt,
4404						   ibmvfc_tgt_implicit_logout_and_del_done);
4405
4406	ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_LOGOUT_RPORT_WAIT);
4407	if (ibmvfc_send_event(evt, vhost, default_timeout)) {
4408		vhost->discovery_threads--;
4409		ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT);
4410		kref_put(&tgt->kref, ibmvfc_release_tgt);
4411	} else
4412		tgt_dbg(tgt, "Sent Implicit Logout\n");
4413}
4414
4415/**
4416 * ibmvfc_tgt_move_login_done - Completion handler for Move Login
4417 * @evt:	ibmvfc event struct
4418 *
4419 **/
4420static void ibmvfc_tgt_move_login_done(struct ibmvfc_event *evt)
4421{
4422	struct ibmvfc_target *tgt = evt->tgt;
4423	struct ibmvfc_host *vhost = evt->vhost;
4424	struct ibmvfc_move_login *rsp = &evt->xfer_iu->move_login;
4425	u32 status = be16_to_cpu(rsp->common.status);
4426	int level = IBMVFC_DEFAULT_LOG_LEVEL;
4427
4428	vhost->discovery_threads--;
4429	ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE);
4430	switch (status) {
4431	case IBMVFC_MAD_SUCCESS:
4432		tgt_dbg(tgt, "Move Login succeeded for new scsi_id: %llX\n", tgt->new_scsi_id);
4433		tgt->ids.node_name = wwn_to_u64(rsp->service_parms.node_name);
4434		tgt->ids.port_name = wwn_to_u64(rsp->service_parms.port_name);
4435		tgt->scsi_id = tgt->new_scsi_id;
4436		tgt->ids.port_id = tgt->scsi_id;
4437		memcpy(&tgt->service_parms, &rsp->service_parms,
4438		       sizeof(tgt->service_parms));
4439		memcpy(&tgt->service_parms_change, &rsp->service_parms_change,
4440		       sizeof(tgt->service_parms_change));
4441		ibmvfc_init_tgt(tgt, ibmvfc_tgt_send_prli);
4442		break;
4443	case IBMVFC_MAD_DRIVER_FAILED:
4444		break;
4445	case IBMVFC_MAD_CRQ_ERROR:
4446		ibmvfc_retry_tgt_init(tgt, ibmvfc_tgt_move_login);
4447		break;
4448	case IBMVFC_MAD_FAILED:
4449	default:
4450		level += ibmvfc_retry_tgt_init(tgt, ibmvfc_tgt_move_login);
4451
4452		tgt_log(tgt, level,
4453			"Move Login failed: new scsi_id: %llX, flags:%x, vios_flags:%x, rc=0x%02X\n",
4454			tgt->new_scsi_id, be32_to_cpu(rsp->flags), be16_to_cpu(rsp->vios_flags),
4455			status);
4456		break;
4457	}
4458
4459	kref_put(&tgt->kref, ibmvfc_release_tgt);
4460	ibmvfc_free_event(evt);
4461	wake_up(&vhost->work_wait_q);
4462}
4463
4464
4465/**
4466 * ibmvfc_tgt_move_login - Initiate a move login for specified target
4467 * @tgt:		ibmvfc target struct
4468 *
4469 **/
4470static void ibmvfc_tgt_move_login(struct ibmvfc_target *tgt)
4471{
4472	struct ibmvfc_host *vhost = tgt->vhost;
4473	struct ibmvfc_move_login *move;
4474	struct ibmvfc_event *evt;
4475
4476	if (vhost->discovery_threads >= disc_threads)
4477		return;
4478
4479	kref_get(&tgt->kref);
4480	evt = ibmvfc_get_reserved_event(&vhost->crq);
4481	if (!evt) {
4482		ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT);
4483		kref_put(&tgt->kref, ibmvfc_release_tgt);
4484		__ibmvfc_reset_host(vhost);
4485		return;
4486	}
4487	vhost->discovery_threads++;
4488	ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_INIT_WAIT);
4489	ibmvfc_init_event(evt, ibmvfc_tgt_move_login_done, IBMVFC_MAD_FORMAT);
4490	evt->tgt = tgt;
4491	move = &evt->iu.move_login;
4492	memset(move, 0, sizeof(*move));
4493	move->common.version = cpu_to_be32(1);
4494	move->common.opcode = cpu_to_be32(IBMVFC_MOVE_LOGIN);
4495	move->common.length = cpu_to_be16(sizeof(*move));
4496
4497	move->old_scsi_id = cpu_to_be64(tgt->scsi_id);
4498	move->new_scsi_id = cpu_to_be64(tgt->new_scsi_id);
4499	move->wwpn = cpu_to_be64(tgt->wwpn);
4500	move->node_name = cpu_to_be64(tgt->ids.node_name);
4501
4502	if (ibmvfc_send_event(evt, vhost, default_timeout)) {
4503		vhost->discovery_threads--;
4504		ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT);
4505		kref_put(&tgt->kref, ibmvfc_release_tgt);
4506	} else
4507		tgt_dbg(tgt, "Sent Move Login for new scsi_id: %llX\n", tgt->new_scsi_id);
4508}
4509
4510/**
4511 * ibmvfc_adisc_needs_plogi - Does device need PLOGI?
4512 * @mad:	ibmvfc passthru mad struct
4513 * @tgt:	ibmvfc target struct
4514 *
4515 * Returns:
4516 *	1 if PLOGI needed / 0 if PLOGI not needed
4517 **/
4518static int ibmvfc_adisc_needs_plogi(struct ibmvfc_passthru_mad *mad,
4519				    struct ibmvfc_target *tgt)
4520{
4521	if (wwn_to_u64((u8 *)&mad->fc_iu.response[2]) != tgt->ids.port_name)
4522		return 1;
4523	if (wwn_to_u64((u8 *)&mad->fc_iu.response[4]) != tgt->ids.node_name)
4524		return 1;
4525	if (be32_to_cpu(mad->fc_iu.response[6]) != tgt->scsi_id)
4526		return 1;
4527	return 0;
4528}
4529
4530/**
4531 * ibmvfc_tgt_adisc_done - Completion handler for ADISC
4532 * @evt:	ibmvfc event struct
4533 *
4534 **/
4535static void ibmvfc_tgt_adisc_done(struct ibmvfc_event *evt)
4536{
4537	struct ibmvfc_target *tgt = evt->tgt;
4538	struct ibmvfc_host *vhost = evt->vhost;
4539	struct ibmvfc_passthru_mad *mad = &evt->xfer_iu->passthru;
4540	u32 status = be16_to_cpu(mad->common.status);
4541	u8 fc_reason, fc_explain;
4542
4543	vhost->discovery_threads--;
4544	ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE);
4545	timer_delete(&tgt->timer);
4546
4547	switch (status) {
4548	case IBMVFC_MAD_SUCCESS:
4549		tgt_dbg(tgt, "ADISC succeeded\n");
4550		if (ibmvfc_adisc_needs_plogi(mad, tgt))
4551			ibmvfc_del_tgt(tgt);
4552		break;
4553	case IBMVFC_MAD_DRIVER_FAILED:
4554		break;
4555	case IBMVFC_MAD_FAILED:
4556	default:
4557		ibmvfc_del_tgt(tgt);
4558		fc_reason = (be32_to_cpu(mad->fc_iu.response[1]) & 0x00ff0000) >> 16;
4559		fc_explain = (be32_to_cpu(mad->fc_iu.response[1]) & 0x0000ff00) >> 8;
4560		tgt_info(tgt, "ADISC failed: %s (%x:%x) %s (%x) %s (%x) rc=0x%02X\n",
4561			 ibmvfc_get_cmd_error(be16_to_cpu(mad->iu.status), be16_to_cpu(mad->iu.error)),
4562			 be16_to_cpu(mad->iu.status), be16_to_cpu(mad->iu.error),
4563			 ibmvfc_get_fc_type(fc_reason), fc_reason,
4564			 ibmvfc_get_ls_explain(fc_explain), fc_explain, status);
4565		break;
4566	}
4567
4568	kref_put(&tgt->kref, ibmvfc_release_tgt);
4569	ibmvfc_free_event(evt);
4570	wake_up(&vhost->work_wait_q);
4571}
4572
4573/**
4574 * ibmvfc_init_passthru - Initialize an event struct for FC passthru
4575 * @evt:		ibmvfc event struct
4576 *
4577 **/
4578static void ibmvfc_init_passthru(struct ibmvfc_event *evt)
4579{
4580	struct ibmvfc_passthru_mad *mad = &evt->iu.passthru;
4581
4582	memset(mad, 0, sizeof(*mad));
4583	mad->common.version = cpu_to_be32(1);
4584	mad->common.opcode = cpu_to_be32(IBMVFC_PASSTHRU);
4585	mad->common.length = cpu_to_be16(sizeof(*mad) - sizeof(mad->fc_iu) - sizeof(mad->iu));
4586	mad->cmd_ioba.va = cpu_to_be64((u64)be64_to_cpu(evt->crq.ioba) +
4587		offsetof(struct ibmvfc_passthru_mad, iu));
4588	mad->cmd_ioba.len = cpu_to_be32(sizeof(mad->iu));
4589	mad->iu.cmd_len = cpu_to_be32(sizeof(mad->fc_iu.payload));
4590	mad->iu.rsp_len = cpu_to_be32(sizeof(mad->fc_iu.response));
4591	mad->iu.cmd.va = cpu_to_be64((u64)be64_to_cpu(evt->crq.ioba) +
4592		offsetof(struct ibmvfc_passthru_mad, fc_iu) +
4593		offsetof(struct ibmvfc_passthru_fc_iu, payload));
4594	mad->iu.cmd.len = cpu_to_be32(sizeof(mad->fc_iu.payload));
4595	mad->iu.rsp.va = cpu_to_be64((u64)be64_to_cpu(evt->crq.ioba) +
4596		offsetof(struct ibmvfc_passthru_mad, fc_iu) +
4597		offsetof(struct ibmvfc_passthru_fc_iu, response));
4598	mad->iu.rsp.len = cpu_to_be32(sizeof(mad->fc_iu.response));
4599}
4600
4601/**
4602 * ibmvfc_tgt_adisc_cancel_done - Completion handler when cancelling an ADISC
4603 * @evt:		ibmvfc event struct
4604 *
4605 * Just cleanup this event struct. Everything else is handled by
4606 * the ADISC completion handler. If the ADISC never actually comes
4607 * back, we still have the timer running on the ADISC event struct
4608 * which will fire and cause the CRQ to get reset.
4609 *
4610 **/
4611static void ibmvfc_tgt_adisc_cancel_done(struct ibmvfc_event *evt)
4612{
4613	struct ibmvfc_host *vhost = evt->vhost;
4614	struct ibmvfc_target *tgt = evt->tgt;
4615
4616	tgt_dbg(tgt, "ADISC cancel complete\n");
4617	vhost->abort_threads--;
4618	ibmvfc_free_event(evt);
4619	kref_put(&tgt->kref, ibmvfc_release_tgt);
4620	wake_up(&vhost->work_wait_q);
4621}
4622
4623/**
4624 * ibmvfc_adisc_timeout - Handle an ADISC timeout
4625 * @t:		ibmvfc target struct
4626 *
4627 * If an ADISC times out, send a cancel. If the cancel times
4628 * out, reset the CRQ. When the ADISC comes back as cancelled,
4629 * log back into the target.
4630 **/
4631static void ibmvfc_adisc_timeout(struct timer_list *t)
4632{
4633	struct ibmvfc_target *tgt = timer_container_of(tgt, t, timer);
4634	struct ibmvfc_host *vhost = tgt->vhost;
4635	struct ibmvfc_event *evt;
4636	struct ibmvfc_tmf *tmf;
4637	unsigned long flags;
4638	int rc;
4639
4640	tgt_dbg(tgt, "ADISC timeout\n");
4641	spin_lock_irqsave(vhost->host->host_lock, flags);
4642	if (vhost->abort_threads >= disc_threads ||
4643	    tgt->action != IBMVFC_TGT_ACTION_INIT_WAIT ||
4644	    vhost->state != IBMVFC_INITIALIZING ||
4645	    vhost->action != IBMVFC_HOST_ACTION_QUERY_TGTS) {
4646		spin_unlock_irqrestore(vhost->host->host_lock, flags);
4647		return;
4648	}
4649
4650	vhost->abort_threads++;
4651	kref_get(&tgt->kref);
4652	evt = ibmvfc_get_reserved_event(&vhost->crq);
4653	if (!evt) {
4654		tgt_err(tgt, "Failed to get cancel event for ADISC.\n");
4655		vhost->abort_threads--;
4656		kref_put(&tgt->kref, ibmvfc_release_tgt);
4657		__ibmvfc_reset_host(vhost);
4658		spin_unlock_irqrestore(vhost->host->host_lock, flags);
4659		return;
4660	}
4661	ibmvfc_init_event(evt, ibmvfc_tgt_adisc_cancel_done, IBMVFC_MAD_FORMAT);
4662
4663	evt->tgt = tgt;
4664	tmf = &evt->iu.tmf;
4665	memset(tmf, 0, sizeof(*tmf));
4666	if (ibmvfc_check_caps(vhost, IBMVFC_HANDLE_VF_WWPN)) {
4667		tmf->common.version = cpu_to_be32(2);
4668		tmf->target_wwpn = cpu_to_be64(tgt->wwpn);
4669	} else {
4670		tmf->common.version = cpu_to_be32(1);
4671	}
4672	tmf->common.opcode = cpu_to_be32(IBMVFC_TMF_MAD);
4673	tmf->common.length = cpu_to_be16(sizeof(*tmf));
4674	tmf->scsi_id = cpu_to_be64(tgt->scsi_id);
4675	tmf->cancel_key = cpu_to_be32(tgt->cancel_key);
4676
4677	rc = ibmvfc_send_event(evt, vhost, default_timeout);
4678
4679	if (rc) {
4680		tgt_err(tgt, "Failed to send cancel event for ADISC. rc=%d\n", rc);
4681		vhost->abort_threads--;
4682		kref_put(&tgt->kref, ibmvfc_release_tgt);
4683		__ibmvfc_reset_host(vhost);
4684	} else
4685		tgt_dbg(tgt, "Attempting to cancel ADISC\n");
4686	spin_unlock_irqrestore(vhost->host->host_lock, flags);
4687}
4688
4689/**
4690 * ibmvfc_tgt_adisc - Initiate an ADISC for specified target
4691 * @tgt:		ibmvfc target struct
4692 *
4693 * When sending an ADISC we end up with two timers running. The
4694 * first timer is the timer in the ibmvfc target struct. If this
4695 * fires, we send a cancel to the target. The second timer is the
4696 * timer on the ibmvfc event for the ADISC, which is longer. If that
4697 * fires, it means the ADISC timed out and our attempt to cancel it
4698 * also failed, so we need to reset the CRQ.
4699 **/
4700static void ibmvfc_tgt_adisc(struct ibmvfc_target *tgt)
4701{
4702	struct ibmvfc_passthru_mad *mad;
4703	struct ibmvfc_host *vhost = tgt->vhost;
4704	struct ibmvfc_event *evt;
4705
4706	if (vhost->discovery_threads >= disc_threads)
4707		return;
4708
4709	kref_get(&tgt->kref);
4710	evt = ibmvfc_get_reserved_event(&vhost->crq);
4711	if (!evt) {
4712		ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE);
4713		kref_put(&tgt->kref, ibmvfc_release_tgt);
4714		__ibmvfc_reset_host(vhost);
4715		return;
4716	}
4717	vhost->discovery_threads++;
4718	ibmvfc_init_event(evt, ibmvfc_tgt_adisc_done, IBMVFC_MAD_FORMAT);
4719	evt->tgt = tgt;
4720
4721	ibmvfc_init_passthru(evt);
4722	mad = &evt->iu.passthru;
4723	mad->iu.flags = cpu_to_be32(IBMVFC_FC_ELS);
4724	mad->iu.scsi_id = cpu_to_be64(tgt->scsi_id);
4725	mad->iu.cancel_key = cpu_to_be32(tgt->cancel_key);
4726
4727	mad->fc_iu.payload[0] = cpu_to_be32(IBMVFC_ADISC);
4728	memcpy(&mad->fc_iu.payload[2], &vhost->login_buf->resp.port_name,
4729	       sizeof(vhost->login_buf->resp.port_name));
4730	memcpy(&mad->fc_iu.payload[4], &vhost->login_buf->resp.node_name,
4731	       sizeof(vhost->login_buf->resp.node_name));
4732	mad->fc_iu.payload[6] = cpu_to_be32(be64_to_cpu(vhost->login_buf->resp.scsi_id) & 0x00ffffff);
4733
4734	if (timer_pending(&tgt->timer))
4735		mod_timer(&tgt->timer, jiffies + (IBMVFC_ADISC_TIMEOUT * HZ));
4736	else {
4737		tgt->timer.expires = jiffies + (IBMVFC_ADISC_TIMEOUT * HZ);
4738		add_timer(&tgt->timer);
4739	}
4740
4741	ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_INIT_WAIT);
4742	if (ibmvfc_send_event(evt, vhost, IBMVFC_ADISC_PLUS_CANCEL_TIMEOUT)) {
4743		vhost->discovery_threads--;
4744		timer_delete(&tgt->timer);
4745		ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE);
4746		kref_put(&tgt->kref, ibmvfc_release_tgt);
4747	} else
4748		tgt_dbg(tgt, "Sent ADISC\n");
4749}
4750
4751/**
4752 * ibmvfc_tgt_query_target_done - Completion handler for Query Target MAD
4753 * @evt:	ibmvfc event struct
4754 *
4755 **/
4756static void ibmvfc_tgt_query_target_done(struct ibmvfc_event *evt)
4757{
4758	struct ibmvfc_target *tgt = evt->tgt;
4759	struct ibmvfc_host *vhost = evt->vhost;
4760	struct ibmvfc_query_tgt *rsp = &evt->xfer_iu->query_tgt;
4761	u32 status = be16_to_cpu(rsp->common.status);
4762	int level = IBMVFC_DEFAULT_LOG_LEVEL;
4763
4764	vhost->discovery_threads--;
4765	ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE);
4766	switch (status) {
4767	case IBMVFC_MAD_SUCCESS:
4768		tgt_dbg(tgt, "Query Target succeeded\n");
4769		if (be64_to_cpu(rsp->scsi_id) != tgt->scsi_id)
4770			ibmvfc_del_tgt(tgt);
4771		else
4772			ibmvfc_init_tgt(tgt, ibmvfc_tgt_adisc);
4773		break;
4774	case IBMVFC_MAD_DRIVER_FAILED:
4775		break;
4776	case IBMVFC_MAD_CRQ_ERROR:
4777		ibmvfc_retry_tgt_init(tgt, ibmvfc_tgt_query_target);
4778		break;
4779	case IBMVFC_MAD_FAILED:
4780	default:
4781		if ((be16_to_cpu(rsp->status) & IBMVFC_FABRIC_MAPPED) == IBMVFC_FABRIC_MAPPED &&
4782		    be16_to_cpu(rsp->error) == IBMVFC_UNABLE_TO_PERFORM_REQ &&
4783		    be16_to_cpu(rsp->fc_explain) == IBMVFC_PORT_NAME_NOT_REG)
4784			ibmvfc_del_tgt(tgt);
4785		else if (ibmvfc_retry_cmd(be16_to_cpu(rsp->status), be16_to_cpu(rsp->error)))
4786			level += ibmvfc_retry_tgt_init(tgt, ibmvfc_tgt_query_target);
4787		else
4788			ibmvfc_del_tgt(tgt);
4789
4790		tgt_log(tgt, level, "Query Target failed: %s (%x:%x) %s (%x) %s (%x) rc=0x%02X\n",
4791			ibmvfc_get_cmd_error(be16_to_cpu(rsp->status), be16_to_cpu(rsp->error)),
4792			be16_to_cpu(rsp->status), be16_to_cpu(rsp->error),
4793			ibmvfc_get_fc_type(be16_to_cpu(rsp->fc_type)), be16_to_cpu(rsp->fc_type),
4794			ibmvfc_get_gs_explain(be16_to_cpu(rsp->fc_explain)), be16_to_cpu(rsp->fc_explain),
4795			status);
4796		break;
4797	}
4798
4799	kref_put(&tgt->kref, ibmvfc_release_tgt);
4800	ibmvfc_free_event(evt);
4801	wake_up(&vhost->work_wait_q);
4802}
4803
4804/**
4805 * ibmvfc_tgt_query_target - Initiate a Query Target for specified target
4806 * @tgt:	ibmvfc target struct
4807 *
4808 **/
4809static void ibmvfc_tgt_query_target(struct ibmvfc_target *tgt)
4810{
4811	struct ibmvfc_query_tgt *query_tgt;
4812	struct ibmvfc_host *vhost = tgt->vhost;
4813	struct ibmvfc_event *evt;
4814
4815	if (vhost->discovery_threads >= disc_threads)
4816		return;
4817
4818	kref_get(&tgt->kref);
4819	evt = ibmvfc_get_reserved_event(&vhost->crq);
4820	if (!evt) {
4821		ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE);
4822		kref_put(&tgt->kref, ibmvfc_release_tgt);
4823		__ibmvfc_reset_host(vhost);
4824		return;
4825	}
4826	vhost->discovery_threads++;
4827	evt->tgt = tgt;
4828	ibmvfc_init_event(evt, ibmvfc_tgt_query_target_done, IBMVFC_MAD_FORMAT);
4829	query_tgt = &evt->iu.query_tgt;
4830	memset(query_tgt, 0, sizeof(*query_tgt));
4831	query_tgt->common.version = cpu_to_be32(1);
4832	query_tgt->common.opcode = cpu_to_be32(IBMVFC_QUERY_TARGET);
4833	query_tgt->common.length = cpu_to_be16(sizeof(*query_tgt));
4834	query_tgt->wwpn = cpu_to_be64(tgt->ids.port_name);
4835
4836	ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_INIT_WAIT);
4837	if (ibmvfc_send_event(evt, vhost, default_timeout)) {
4838		vhost->discovery_threads--;
4839		ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_NONE);
4840		kref_put(&tgt->kref, ibmvfc_release_tgt);
4841	} else
4842		tgt_dbg(tgt, "Sent Query Target\n");
4843}
4844
4845/**
4846 * ibmvfc_alloc_target - Allocate and initialize an ibmvfc target
4847 * @vhost:		ibmvfc host struct
4848 * @target:		Holds SCSI ID to allocate target forand the WWPN
4849 *
4850 * Returns:
4851 *	0 on success / other on failure
4852 **/
4853static int ibmvfc_alloc_target(struct ibmvfc_host *vhost,
4854			       struct ibmvfc_discover_targets_entry *target)
4855{
4856	struct ibmvfc_target *stgt = NULL;
4857	struct ibmvfc_target *wtgt = NULL;
4858	struct ibmvfc_target *tgt;
4859	unsigned long flags;
4860	u64 scsi_id = be32_to_cpu(target->scsi_id) & IBMVFC_DISC_TGT_SCSI_ID_MASK;
4861	u64 wwpn = be64_to_cpu(target->wwpn);
4862
4863	/* Look to see if we already have a target allocated for this SCSI ID or WWPN */
4864	spin_lock_irqsave(vhost->host->host_lock, flags);
4865	list_for_each_entry(tgt, &vhost->targets, queue) {
4866		if (tgt->wwpn == wwpn) {
4867			wtgt = tgt;
4868			break;
4869		}
4870	}
4871
4872	list_for_each_entry(tgt, &vhost->targets, queue) {
4873		if (tgt->scsi_id == scsi_id) {
4874			stgt = tgt;
4875			break;
4876		}
4877	}
4878
4879	if (wtgt && !stgt) {
4880		/*
4881		 * A WWPN target has moved and we still are tracking the old
4882		 * SCSI ID.  The only way we should be able to get here is if
4883		 * we attempted to send an implicit logout for the old SCSI ID
4884		 * and it failed for some reason, such as there being I/O
4885		 * pending to the target. In this case, we will have already
4886		 * deleted the rport from the FC transport so we do a move
4887		 * login, which works even with I/O pending, however, if
4888		 * there is still I/O pending, it will stay outstanding, so
4889		 * we only do this if fast fail is disabled for the rport,
4890		 * otherwise we let terminate_rport_io clean up the port
4891		 * before we login at the new location.
4892		 */
4893		if (wtgt->action == IBMVFC_TGT_ACTION_LOGOUT_DELETED_RPORT) {
4894			if (wtgt->move_login) {
4895				/*
4896				 * Do a move login here. The old target is no longer
4897				 * known to the transport layer We don't use the
4898				 * normal ibmvfc_set_tgt_action to set this, as we
4899				 * don't normally want to allow this state change.
4900				 */
4901				wtgt->new_scsi_id = scsi_id;
4902				wtgt->action = IBMVFC_TGT_ACTION_INIT;
4903				wtgt->init_retries = 0;
4904				ibmvfc_init_tgt(wtgt, ibmvfc_tgt_move_login);
4905			}
4906			goto unlock_out;
4907		} else {
4908			tgt_err(wtgt, "Unexpected target state: %d, %p\n",
4909				wtgt->action, wtgt->rport);
4910		}
4911	} else if (stgt) {
4912		if (tgt->need_login)
4913			ibmvfc_init_tgt(tgt, ibmvfc_tgt_implicit_logout);
4914		goto unlock_out;
4915	}
4916	spin_unlock_irqrestore(vhost->host->host_lock, flags);
4917
4918	tgt = mempool_alloc(vhost->tgt_pool, GFP_NOIO);
4919	memset(tgt, 0, sizeof(*tgt));
4920	tgt->scsi_id = scsi_id;
4921	tgt->wwpn = wwpn;
4922	tgt->vhost = vhost;
4923	tgt->need_login = 1;
4924	timer_setup(&tgt->timer, ibmvfc_adisc_timeout, 0);
4925	kref_init(&tgt->kref);
4926	ibmvfc_init_tgt(tgt, ibmvfc_tgt_implicit_logout);
4927	spin_lock_irqsave(vhost->host->host_lock, flags);
4928	tgt->cancel_key = vhost->task_set++;
4929	list_add_tail(&tgt->queue, &vhost->targets);
4930
4931unlock_out:
4932	spin_unlock_irqrestore(vhost->host->host_lock, flags);
4933	return 0;
4934}
4935
4936/**
4937 * ibmvfc_alloc_targets - Allocate and initialize ibmvfc targets
4938 * @vhost:		ibmvfc host struct
4939 *
4940 * Returns:
4941 *	0 on success / other on failure
4942 **/
4943static int ibmvfc_alloc_targets(struct ibmvfc_host *vhost)
4944{
4945	int i, rc;
4946
4947	for (i = 0, rc = 0; !rc && i < vhost->num_targets; i++)
4948		rc = ibmvfc_alloc_target(vhost, &vhost->scsi_scrqs.disc_buf[i]);
4949
4950	return rc;
4951}
4952
4953/**
4954 * ibmvfc_discover_targets_done - Completion handler for discover targets MAD
4955 * @evt:	ibmvfc event struct
4956 *
4957 **/
4958static void ibmvfc_discover_targets_done(struct ibmvfc_event *evt)
4959{
4960	struct ibmvfc_host *vhost = evt->vhost;
4961	struct ibmvfc_discover_targets *rsp = &evt->xfer_iu->discover_targets;
4962	u32 mad_status = be16_to_cpu(rsp->common.status);
4963	int level = IBMVFC_DEFAULT_LOG_LEVEL;
4964
4965	switch (mad_status) {
4966	case IBMVFC_MAD_SUCCESS:
4967		ibmvfc_dbg(vhost, "Discover Targets succeeded\n");
4968		vhost->num_targets = min_t(u32, be32_to_cpu(rsp->num_written),
4969					   max_targets);
4970		ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_ALLOC_TGTS);
4971		break;
4972	case IBMVFC_MAD_FAILED:
4973		level += ibmvfc_retry_host_init(vhost);
4974		ibmvfc_log(vhost, level, "Discover Targets failed: %s (%x:%x)\n",
4975			   ibmvfc_get_cmd_error(be16_to_cpu(rsp->status), be16_to_cpu(rsp->error)),
4976			   be16_to_cpu(rsp->status), be16_to_cpu(rsp->error));
4977		break;
4978	case IBMVFC_MAD_DRIVER_FAILED:
4979		break;
4980	default:
4981		dev_err(vhost->dev, "Invalid Discover Targets response: 0x%x\n", mad_status);
4982		ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
4983		break;
4984	}
4985
4986	ibmvfc_free_event(evt);
4987	wake_up(&vhost->work_wait_q);
4988}
4989
4990/**
4991 * ibmvfc_discover_targets - Send Discover Targets MAD
4992 * @vhost:	ibmvfc host struct
4993 *
4994 **/
4995static void ibmvfc_discover_targets(struct ibmvfc_host *vhost)
4996{
4997	struct ibmvfc_discover_targets *mad;
4998	struct ibmvfc_event *evt = ibmvfc_get_reserved_event(&vhost->crq);
4999	int level = IBMVFC_DEFAULT_LOG_LEVEL;
5000
5001	if (!evt) {
5002		ibmvfc_log(vhost, level, "Discover Targets failed: no available events\n");
5003		ibmvfc_hard_reset_host(vhost);
5004		return;
5005	}
5006
5007	ibmvfc_init_event(evt, ibmvfc_discover_targets_done, IBMVFC_MAD_FORMAT);
5008	mad = &evt->iu.discover_targets;
5009	memset(mad, 0, sizeof(*mad));
5010	mad->common.version = cpu_to_be32(1);
5011	mad->common.opcode = cpu_to_be32(IBMVFC_DISC_TARGETS);
5012	mad->common.length = cpu_to_be16(sizeof(*mad));
5013	mad->bufflen = cpu_to_be32(vhost->scsi_scrqs.disc_buf_sz);
5014	mad->buffer.va = cpu_to_be64(vhost->scsi_scrqs.disc_buf_dma);
5015	mad->buffer.len = cpu_to_be32(vhost->scsi_scrqs.disc_buf_sz);
5016	mad->flags = cpu_to_be32(IBMVFC_DISC_TGT_PORT_ID_WWPN_LIST);
5017	ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_INIT_WAIT);
5018
5019	if (!ibmvfc_send_event(evt, vhost, default_timeout))
5020		ibmvfc_dbg(vhost, "Sent discover targets\n");
5021	else
5022		ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
5023}
5024
5025static void ibmvfc_channel_setup_done(struct ibmvfc_event *evt)
5026{
5027	struct ibmvfc_host *vhost = evt->vhost;
5028	struct ibmvfc_channel_setup *setup = vhost->channel_setup_buf;
5029	struct ibmvfc_channels *scrqs = &vhost->scsi_scrqs;
5030	u32 mad_status = be16_to_cpu(evt->xfer_iu->channel_setup.common.status);
5031	int level = IBMVFC_DEFAULT_LOG_LEVEL;
5032	int flags, active_queues, i;
5033
5034	ibmvfc_free_event(evt);
5035
5036	switch (mad_status) {
5037	case IBMVFC_MAD_SUCCESS:
5038		ibmvfc_dbg(vhost, "Channel Setup succeeded\n");
5039		flags = be32_to_cpu(setup->flags);
5040		vhost->do_enquiry = 0;
5041		active_queues = be32_to_cpu(setup->num_scsi_subq_channels);
5042		scrqs->active_queues = active_queues;
5043
5044		if (flags & IBMVFC_CHANNELS_CANCELED) {
5045			ibmvfc_dbg(vhost, "Channels Canceled\n");
5046			vhost->using_channels = 0;
5047		} else {
5048			if (active_queues)
5049				vhost->using_channels = 1;
5050			for (i = 0; i < active_queues; i++)
5051				scrqs->scrqs[i].vios_cookie =
5052					be64_to_cpu(setup->channel_handles[i]);
5053
5054			ibmvfc_dbg(vhost, "Using %u channels\n",
5055				   vhost->scsi_scrqs.active_queues);
5056		}
5057		break;
5058	case IBMVFC_MAD_FAILED:
5059		level += ibmvfc_retry_host_init(vhost);
5060		ibmvfc_log(vhost, level, "Channel Setup failed\n");
5061		fallthrough;
5062	case IBMVFC_MAD_DRIVER_FAILED:
5063		return;
5064	default:
5065		dev_err(vhost->dev, "Invalid Channel Setup response: 0x%x\n",
5066			mad_status);
5067		ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
5068		return;
5069	}
5070
5071	ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_QUERY);
5072	wake_up(&vhost->work_wait_q);
5073}
5074
5075static void ibmvfc_channel_setup(struct ibmvfc_host *vhost)
5076{
5077	struct ibmvfc_channel_setup_mad *mad;
5078	struct ibmvfc_channel_setup *setup_buf = vhost->channel_setup_buf;
5079	struct ibmvfc_event *evt = ibmvfc_get_reserved_event(&vhost->crq);
5080	struct ibmvfc_channels *scrqs = &vhost->scsi_scrqs;
5081	unsigned int num_channels =
5082		min(scrqs->desired_queues, vhost->max_vios_scsi_channels);
5083	int level = IBMVFC_DEFAULT_LOG_LEVEL;
5084	int i;
5085
5086	if (!evt) {
5087		ibmvfc_log(vhost, level, "Channel Setup failed: no available events\n");
5088		ibmvfc_hard_reset_host(vhost);
5089		return;
5090	}
5091
5092	memset(setup_buf, 0, sizeof(*setup_buf));
5093	if (num_channels == 0)
5094		setup_buf->flags = cpu_to_be32(IBMVFC_CANCEL_CHANNELS);
5095	else {
5096		setup_buf->num_scsi_subq_channels = cpu_to_be32(num_channels);
5097		for (i = 0; i < num_channels; i++)
5098			setup_buf->channel_handles[i] = cpu_to_be64(scrqs->scrqs[i].cookie);
5099	}
5100
5101	ibmvfc_init_event(evt, ibmvfc_channel_setup_done, IBMVFC_MAD_FORMAT);
5102	mad = &evt->iu.channel_setup;
5103	memset(mad, 0, sizeof(*mad));
5104	mad->common.version = cpu_to_be32(1);
5105	mad->common.opcode = cpu_to_be32(IBMVFC_CHANNEL_SETUP);
5106	mad->common.length = cpu_to_be16(sizeof(*mad));
5107	mad->buffer.va = cpu_to_be64(vhost->channel_setup_dma);
5108	mad->buffer.len = cpu_to_be32(sizeof(*vhost->channel_setup_buf));
5109
5110	ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_INIT_WAIT);
5111
5112	if (!ibmvfc_send_event(evt, vhost, default_timeout))
5113		ibmvfc_dbg(vhost, "Sent channel setup\n");
5114	else
5115		ibmvfc_link_down(vhost, IBMVFC_LINK_DOWN);
5116}
5117
5118static void ibmvfc_channel_enquiry_done(struct ibmvfc_event *evt)
5119{
5120	struct ibmvfc_host *vhost = evt->vhost;
5121	struct ibmvfc_channel_enquiry *rsp = &evt->xfer_iu->channel_enquiry;
5122	u32 mad_status = be16_to_cpu(rsp->common.status);
5123	int level = IBMVFC_DEFAULT_LOG_LEVEL;
5124
5125	switch (mad_status) {
5126	case IBMVFC_MAD_SUCCESS:
5127		ibmvfc_dbg(vhost, "Channel Enquiry succeeded\n");
5128		vhost->max_vios_scsi_channels = be32_to_cpu(rsp->num_scsi_subq_channels);
5129		ibmvfc_free_event(evt);
5130		break;
5131	case IBMVFC_MAD_FAILED:
5132		level += ibmvfc_retry_host_init(vhost);
5133		ibmvfc_log(vhost, level, "Channel Enquiry failed\n");
5134		fallthrough;
5135	case IBMVFC_MAD_DRIVER_FAILED:
5136		ibmvfc_free_event(evt);
5137		return;
5138	default:
5139		dev_err(vhost->dev, "Invalid Channel Enquiry response: 0x%x\n",
5140			mad_status);
5141		ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
5142		ibmvfc_free_event(evt);
5143		return;
5144	}
5145
5146	ibmvfc_channel_setup(vhost);
5147}
5148
5149static void ibmvfc_channel_enquiry(struct ibmvfc_host *vhost)
5150{
5151	struct ibmvfc_channel_enquiry *mad;
5152	struct ibmvfc_event *evt = ibmvfc_get_reserved_event(&vhost->crq);
5153	int level = IBMVFC_DEFAULT_LOG_LEVEL;
5154
5155	if (!evt) {
5156		ibmvfc_log(vhost, level, "Channel Enquiry failed: no available events\n");
5157		ibmvfc_hard_reset_host(vhost);
5158		return;
5159	}
5160
5161	ibmvfc_init_event(evt, ibmvfc_channel_enquiry_done, IBMVFC_MAD_FORMAT);
5162	mad = &evt->iu.channel_enquiry;
5163	memset(mad, 0, sizeof(*mad));
5164	mad->common.version = cpu_to_be32(1);
5165	mad->common.opcode = cpu_to_be32(IBMVFC_CHANNEL_ENQUIRY);
5166	mad->common.length = cpu_to_be16(sizeof(*mad));
5167
5168	if (mig_channels_only)
5169		mad->flags |= cpu_to_be32(IBMVFC_NO_CHANNELS_TO_CRQ_SUPPORT);
5170	if (mig_no_less_channels)
5171		mad->flags |= cpu_to_be32(IBMVFC_NO_N_TO_M_CHANNELS_SUPPORT);
5172
5173	ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_INIT_WAIT);
5174
5175	if (!ibmvfc_send_event(evt, vhost, default_timeout))
5176		ibmvfc_dbg(vhost, "Send channel enquiry\n");
5177	else
5178		ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
5179}
5180
5181/**
5182 * ibmvfc_npiv_login_done - Completion handler for NPIV Login
5183 * @evt:	ibmvfc event struct
5184 *
5185 **/
5186static void ibmvfc_npiv_login_done(struct ibmvfc_event *evt)
5187{
5188	struct ibmvfc_host *vhost = evt->vhost;
5189	u32 mad_status = be16_to_cpu(evt->xfer_iu->npiv_login.common.status);
5190	struct ibmvfc_npiv_login_resp *rsp = &vhost->login_buf->resp;
5191	unsigned int npiv_max_sectors;
5192	int level = IBMVFC_DEFAULT_LOG_LEVEL;
5193
5194	switch (mad_status) {
5195	case IBMVFC_MAD_SUCCESS:
5196		ibmvfc_free_event(evt);
5197		break;
5198	case IBMVFC_MAD_FAILED:
5199		if (ibmvfc_retry_cmd(be16_to_cpu(rsp->status), be16_to_cpu(rsp->error)))
5200			level += ibmvfc_retry_host_init(vhost);
5201		else
5202			ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
5203		ibmvfc_log(vhost, level, "NPIV Login failed: %s (%x:%x)\n",
5204			   ibmvfc_get_cmd_error(be16_to_cpu(rsp->status), be16_to_cpu(rsp->error)),
5205						be16_to_cpu(rsp->status), be16_to_cpu(rsp->error));
5206		ibmvfc_free_event(evt);
5207		return;
5208	case IBMVFC_MAD_CRQ_ERROR:
5209		ibmvfc_retry_host_init(vhost);
5210		fallthrough;
5211	case IBMVFC_MAD_DRIVER_FAILED:
5212		ibmvfc_free_event(evt);
5213		return;
5214	default:
5215		dev_err(vhost->dev, "Invalid NPIV Login response: 0x%x\n", mad_status);
5216		ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
5217		ibmvfc_free_event(evt);
5218		return;
5219	}
5220
5221	vhost->client_migrated = 0;
5222
5223	if (!(be32_to_cpu(rsp->flags) & IBMVFC_NATIVE_FC)) {
5224		dev_err(vhost->dev, "Virtual adapter does not support FC. %x\n",
5225			rsp->flags);
5226		ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
5227		wake_up(&vhost->work_wait_q);
5228		return;
5229	}
5230
5231	if (be32_to_cpu(rsp->max_cmds) <= IBMVFC_NUM_INTERNAL_REQ) {
5232		dev_err(vhost->dev, "Virtual adapter supported queue depth too small: %d\n",
5233			rsp->max_cmds);
5234		ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
5235		wake_up(&vhost->work_wait_q);
5236		return;
5237	}
5238
5239	vhost->logged_in = 1;
5240	npiv_max_sectors = min((uint)(be64_to_cpu(rsp->max_dma_len) >> 9), max_sectors);
5241	dev_info(vhost->dev, "Host partition: %s, device: %s %s %s max sectors %u\n",
5242		 rsp->partition_name, rsp->device_name, rsp->port_loc_code,
5243		 rsp->drc_name, npiv_max_sectors);
5244
5245	fc_host_fabric_name(vhost->host) = be64_to_cpu(rsp->node_name);
5246	fc_host_node_name(vhost->host) = be64_to_cpu(rsp->node_name);
5247	fc_host_port_name(vhost->host) = be64_to_cpu(rsp->port_name);
5248	fc_host_port_id(vhost->host) = be64_to_cpu(rsp->scsi_id);
5249	fc_host_port_type(vhost->host) = FC_PORTTYPE_NPIV;
5250	fc_host_supported_classes(vhost->host) = 0;
5251	if (be32_to_cpu(rsp->service_parms.class1_parms[0]) & 0x80000000)
5252		fc_host_supported_classes(vhost->host) |= FC_COS_CLASS1;
5253	if (be32_to_cpu(rsp->service_parms.class2_parms[0]) & 0x80000000)
5254		fc_host_supported_classes(vhost->host) |= FC_COS_CLASS2;
5255	if (be32_to_cpu(rsp->service_parms.class3_parms[0]) & 0x80000000)
5256		fc_host_supported_classes(vhost->host) |= FC_COS_CLASS3;
5257	fc_host_maxframe_size(vhost->host) =
5258		be16_to_cpu(rsp->service_parms.common.bb_rcv_sz) & 0x0fff;
5259
5260	vhost->host->can_queue = be32_to_cpu(rsp->max_cmds) - IBMVFC_NUM_INTERNAL_REQ;
5261	vhost->host->max_sectors = npiv_max_sectors;
5262
5263	if (ibmvfc_check_caps(vhost, IBMVFC_CAN_SUPPORT_CHANNELS) && vhost->do_enquiry) {
5264		ibmvfc_channel_enquiry(vhost);
5265	} else {
5266		vhost->do_enquiry = 0;
5267		ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_QUERY);
5268		wake_up(&vhost->work_wait_q);
5269	}
5270}
5271
5272/**
5273 * ibmvfc_npiv_login - Sends NPIV login
5274 * @vhost:	ibmvfc host struct
5275 *
5276 **/
5277static void ibmvfc_npiv_login(struct ibmvfc_host *vhost)
5278{
5279	struct ibmvfc_npiv_login_mad *mad;
5280	struct ibmvfc_event *evt = ibmvfc_get_reserved_event(&vhost->crq);
5281
5282	if (!evt) {
5283		ibmvfc_dbg(vhost, "NPIV Login failed: no available events\n");
5284		ibmvfc_hard_reset_host(vhost);
5285		return;
5286	}
5287
5288	ibmvfc_gather_partition_info(vhost);
5289	ibmvfc_set_login_info(vhost);
5290	ibmvfc_init_event(evt, ibmvfc_npiv_login_done, IBMVFC_MAD_FORMAT);
5291
5292	memcpy(vhost->login_buf, &vhost->login_info, sizeof(vhost->login_info));
5293	mad = &evt->iu.npiv_login;
5294	memset(mad, 0, sizeof(struct ibmvfc_npiv_login_mad));
5295	mad->common.version = cpu_to_be32(1);
5296	mad->common.opcode = cpu_to_be32(IBMVFC_NPIV_LOGIN);
5297	mad->common.length = cpu_to_be16(sizeof(struct ibmvfc_npiv_login_mad));
5298	mad->buffer.va = cpu_to_be64(vhost->login_buf_dma);
5299	mad->buffer.len = cpu_to_be32(sizeof(*vhost->login_buf));
5300
5301	ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_INIT_WAIT);
5302
5303	if (!ibmvfc_send_event(evt, vhost, default_timeout))
5304		ibmvfc_dbg(vhost, "Sent NPIV login\n");
5305	else
5306		ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
5307}
5308
5309/**
5310 * ibmvfc_npiv_logout_done - Completion handler for NPIV Logout
5311 * @evt:		ibmvfc event struct
5312 *
5313 **/
5314static void ibmvfc_npiv_logout_done(struct ibmvfc_event *evt)
5315{
5316	struct ibmvfc_host *vhost = evt->vhost;
5317	u32 mad_status = be16_to_cpu(evt->xfer_iu->npiv_logout.common.status);
5318
5319	ibmvfc_free_event(evt);
5320
5321	switch (mad_status) {
5322	case IBMVFC_MAD_SUCCESS:
5323		if (list_empty(&vhost->crq.sent) &&
5324		    vhost->action == IBMVFC_HOST_ACTION_LOGO_WAIT) {
5325			ibmvfc_init_host(vhost);
5326			return;
5327		}
5328		break;
5329	case IBMVFC_MAD_FAILED:
5330	case IBMVFC_MAD_NOT_SUPPORTED:
5331	case IBMVFC_MAD_CRQ_ERROR:
5332	case IBMVFC_MAD_DRIVER_FAILED:
5333	default:
5334		ibmvfc_dbg(vhost, "NPIV Logout failed. 0x%X\n", mad_status);
5335		break;
5336	}
5337
5338	ibmvfc_hard_reset_host(vhost);
5339}
5340
5341/**
5342 * ibmvfc_npiv_logout - Issue an NPIV Logout
5343 * @vhost:		ibmvfc host struct
5344 *
5345 **/
5346static void ibmvfc_npiv_logout(struct ibmvfc_host *vhost)
5347{
5348	struct ibmvfc_npiv_logout_mad *mad;
5349	struct ibmvfc_event *evt;
5350
5351	evt = ibmvfc_get_reserved_event(&vhost->crq);
5352	if (!evt) {
5353		ibmvfc_dbg(vhost, "NPIV Logout failed: no available events\n");
5354		ibmvfc_hard_reset_host(vhost);
5355		return;
5356	}
5357
5358	ibmvfc_init_event(evt, ibmvfc_npiv_logout_done, IBMVFC_MAD_FORMAT);
5359
5360	mad = &evt->iu.npiv_logout;
5361	memset(mad, 0, sizeof(*mad));
5362	mad->common.version = cpu_to_be32(1);
5363	mad->common.opcode = cpu_to_be32(IBMVFC_NPIV_LOGOUT);
5364	mad->common.length = cpu_to_be16(sizeof(struct ibmvfc_npiv_logout_mad));
5365
5366	ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_LOGO_WAIT);
5367
5368	if (!ibmvfc_send_event(evt, vhost, default_timeout))
5369		ibmvfc_dbg(vhost, "Sent NPIV logout\n");
5370	else
5371		ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
5372}
5373
5374/**
5375 * ibmvfc_dev_init_to_do - Is there target initialization work to do?
5376 * @vhost:		ibmvfc host struct
5377 *
5378 * Returns:
5379 *	1 if work to do / 0 if not
5380 **/
5381static int ibmvfc_dev_init_to_do(struct ibmvfc_host *vhost)
5382{
5383	struct ibmvfc_target *tgt;
5384
5385	list_for_each_entry(tgt, &vhost->targets, queue) {
5386		if (tgt->action == IBMVFC_TGT_ACTION_INIT ||
5387		    tgt->action == IBMVFC_TGT_ACTION_INIT_WAIT)
5388			return 1;
5389	}
5390
5391	return 0;
5392}
5393
5394/**
5395 * ibmvfc_dev_logo_to_do - Is there target logout work to do?
5396 * @vhost:		ibmvfc host struct
5397 *
5398 * Returns:
5399 *	1 if work to do / 0 if not
5400 **/
5401static int ibmvfc_dev_logo_to_do(struct ibmvfc_host *vhost)
5402{
5403	struct ibmvfc_target *tgt;
5404
5405	list_for_each_entry(tgt, &vhost->targets, queue) {
5406		if (tgt->action == IBMVFC_TGT_ACTION_LOGOUT_RPORT ||
5407		    tgt->action == IBMVFC_TGT_ACTION_LOGOUT_RPORT_WAIT)
5408			return 1;
5409	}
5410	return 0;
5411}
5412
5413/**
5414 * __ibmvfc_work_to_do - Is there task level work to do? (no locking)
5415 * @vhost:		ibmvfc host struct
5416 *
5417 * Returns:
5418 *	1 if work to do / 0 if not
5419 **/
5420static int __ibmvfc_work_to_do(struct ibmvfc_host *vhost)
5421{
5422	struct ibmvfc_target *tgt;
5423
5424	if (kthread_should_stop())
5425		return 1;
5426	switch (vhost->action) {
5427	case IBMVFC_HOST_ACTION_NONE:
5428	case IBMVFC_HOST_ACTION_INIT_WAIT:
5429	case IBMVFC_HOST_ACTION_LOGO_WAIT:
5430		return 0;
5431	case IBMVFC_HOST_ACTION_TGT_INIT:
5432	case IBMVFC_HOST_ACTION_QUERY_TGTS:
5433		if (vhost->discovery_threads == disc_threads)
5434			return 0;
5435		list_for_each_entry(tgt, &vhost->targets, queue)
5436			if (tgt->action == IBMVFC_TGT_ACTION_INIT)
5437				return 1;
5438		list_for_each_entry(tgt, &vhost->targets, queue)
5439			if (tgt->action == IBMVFC_TGT_ACTION_INIT_WAIT)
5440				return 0;
5441		return 1;
5442	case IBMVFC_HOST_ACTION_TGT_DEL:
5443	case IBMVFC_HOST_ACTION_TGT_DEL_FAILED:
5444		if (vhost->discovery_threads == disc_threads)
5445			return 0;
5446		list_for_each_entry(tgt, &vhost->targets, queue)
5447			if (tgt->action == IBMVFC_TGT_ACTION_LOGOUT_RPORT)
5448				return 1;
5449		list_for_each_entry(tgt, &vhost->targets, queue)
5450			if (tgt->action == IBMVFC_TGT_ACTION_LOGOUT_RPORT_WAIT)
5451				return 0;
5452		return 1;
5453	case IBMVFC_HOST_ACTION_LOGO:
5454	case IBMVFC_HOST_ACTION_INIT:
5455	case IBMVFC_HOST_ACTION_ALLOC_TGTS:
5456	case IBMVFC_HOST_ACTION_QUERY:
5457	case IBMVFC_HOST_ACTION_RESET:
5458	case IBMVFC_HOST_ACTION_REENABLE:
5459	default:
5460		break;
5461	}
5462
5463	return 1;
5464}
5465
5466/**
5467 * ibmvfc_work_to_do - Is there task level work to do?
5468 * @vhost:		ibmvfc host struct
5469 *
5470 * Returns:
5471 *	1 if work to do / 0 if not
5472 **/
5473static int ibmvfc_work_to_do(struct ibmvfc_host *vhost)
5474{
5475	unsigned long flags;
5476	int rc;
5477
5478	spin_lock_irqsave(vhost->host->host_lock, flags);
5479	rc = __ibmvfc_work_to_do(vhost);
5480	spin_unlock_irqrestore(vhost->host->host_lock, flags);
5481	return rc;
5482}
5483
5484/**
5485 * ibmvfc_log_ae - Log async events if necessary
5486 * @vhost:		ibmvfc host struct
5487 * @events:		events to log
5488 *
5489 **/
5490static void ibmvfc_log_ae(struct ibmvfc_host *vhost, int events)
5491{
5492	if (events & IBMVFC_AE_RSCN)
5493		fc_host_post_event(vhost->host, fc_get_event_number(), FCH_EVT_RSCN, 0);
5494	if ((events & IBMVFC_AE_LINKDOWN) &&
5495	    vhost->state >= IBMVFC_HALTED)
5496		fc_host_post_event(vhost->host, fc_get_event_number(), FCH_EVT_LINKDOWN, 0);
5497	if ((events & IBMVFC_AE_LINKUP) &&
5498	    vhost->state == IBMVFC_INITIALIZING)
5499		fc_host_post_event(vhost->host, fc_get_event_number(), FCH_EVT_LINKUP, 0);
5500}
5501
5502/**
5503 * ibmvfc_tgt_add_rport - Tell the FC transport about a new remote port
5504 * @tgt:		ibmvfc target struct
5505 *
5506 **/
5507static void ibmvfc_tgt_add_rport(struct ibmvfc_target *tgt)
5508{
5509	struct ibmvfc_host *vhost = tgt->vhost;
5510	struct fc_rport *rport;
5511	unsigned long flags;
5512
5513	tgt_dbg(tgt, "Adding rport\n");
5514	rport = fc_remote_port_add(vhost->host, 0, &tgt->ids);
5515	spin_lock_irqsave(vhost->host->host_lock, flags);
5516
5517	if (rport && tgt->action == IBMVFC_TGT_ACTION_DEL_RPORT) {
5518		tgt_dbg(tgt, "Deleting rport\n");
5519		list_del(&tgt->queue);
5520		ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DELETED_RPORT);
5521		spin_unlock_irqrestore(vhost->host->host_lock, flags);
5522		fc_remote_port_delete(rport);
5523		timer_delete_sync(&tgt->timer);
5524		kref_put(&tgt->kref, ibmvfc_release_tgt);
5525		return;
5526	} else if (rport && tgt->action == IBMVFC_TGT_ACTION_DEL_AND_LOGOUT_RPORT) {
5527		tgt_dbg(tgt, "Deleting rport with outstanding I/O\n");
5528		ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_LOGOUT_DELETED_RPORT);
5529		tgt->rport = NULL;
5530		tgt->init_retries = 0;
5531		spin_unlock_irqrestore(vhost->host->host_lock, flags);
5532		fc_remote_port_delete(rport);
5533		return;
5534	} else if (rport && tgt->action == IBMVFC_TGT_ACTION_DELETED_RPORT) {
5535		spin_unlock_irqrestore(vhost->host->host_lock, flags);
5536		return;
5537	}
5538
5539	if (rport) {
5540		tgt_dbg(tgt, "rport add succeeded\n");
5541		tgt->rport = rport;
5542		rport->maxframe_size = be16_to_cpu(tgt->service_parms.common.bb_rcv_sz) & 0x0fff;
5543		rport->supported_classes = 0;
5544		tgt->target_id = rport->scsi_target_id;
5545		if (be32_to_cpu(tgt->service_parms.class1_parms[0]) & 0x80000000)
5546			rport->supported_classes |= FC_COS_CLASS1;
5547		if (be32_to_cpu(tgt->service_parms.class2_parms[0]) & 0x80000000)
5548			rport->supported_classes |= FC_COS_CLASS2;
5549		if (be32_to_cpu(tgt->service_parms.class3_parms[0]) & 0x80000000)
5550			rport->supported_classes |= FC_COS_CLASS3;
5551	} else
5552		tgt_dbg(tgt, "rport add failed\n");
5553	spin_unlock_irqrestore(vhost->host->host_lock, flags);
5554}
5555
5556/**
5557 * ibmvfc_do_work - Do task level work
5558 * @vhost:		ibmvfc host struct
5559 *
5560 **/
5561static void ibmvfc_do_work(struct ibmvfc_host *vhost)
5562{
5563	struct ibmvfc_target *tgt;
5564	unsigned long flags;
5565	struct fc_rport *rport;
5566	LIST_HEAD(purge);
5567	int rc;
5568
5569	ibmvfc_log_ae(vhost, vhost->events_to_log);
5570	spin_lock_irqsave(vhost->host->host_lock, flags);
5571	vhost->events_to_log = 0;
5572	switch (vhost->action) {
5573	case IBMVFC_HOST_ACTION_NONE:
5574	case IBMVFC_HOST_ACTION_LOGO_WAIT:
5575	case IBMVFC_HOST_ACTION_INIT_WAIT:
5576		break;
5577	case IBMVFC_HOST_ACTION_RESET:
5578		list_splice_init(&vhost->purge, &purge);
5579		spin_unlock_irqrestore(vhost->host->host_lock, flags);
5580		ibmvfc_complete_purge(&purge);
5581		rc = ibmvfc_reset_crq(vhost);
5582
5583		spin_lock_irqsave(vhost->host->host_lock, flags);
5584		if (!rc || rc == H_CLOSED)
5585			vio_enable_interrupts(to_vio_dev(vhost->dev));
5586		if (vhost->action == IBMVFC_HOST_ACTION_RESET) {
5587			/*
5588			 * The only action we could have changed to would have
5589			 * been reenable, in which case, we skip the rest of
5590			 * this path and wait until we've done the re-enable
5591			 * before sending the crq init.
5592			 */
5593			vhost->action = IBMVFC_HOST_ACTION_TGT_DEL;
5594
5595			if (rc || (rc = ibmvfc_send_crq_init(vhost)) ||
5596			    (rc = vio_enable_interrupts(to_vio_dev(vhost->dev)))) {
5597				ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
5598				dev_err(vhost->dev, "Error after reset (rc=%d)\n", rc);
5599			}
5600		}
5601		break;
5602	case IBMVFC_HOST_ACTION_REENABLE:
5603		list_splice_init(&vhost->purge, &purge);
5604		spin_unlock_irqrestore(vhost->host->host_lock, flags);
5605		ibmvfc_complete_purge(&purge);
5606		rc = ibmvfc_reenable_crq_queue(vhost);
5607
5608		spin_lock_irqsave(vhost->host->host_lock, flags);
5609		if (vhost->action == IBMVFC_HOST_ACTION_REENABLE) {
5610			/*
5611			 * The only action we could have changed to would have
5612			 * been reset, in which case, we skip the rest of this
5613			 * path and wait until we've done the reset before
5614			 * sending the crq init.
5615			 */
5616			vhost->action = IBMVFC_HOST_ACTION_TGT_DEL;
5617			if (rc || (rc = ibmvfc_send_crq_init(vhost))) {
5618				ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
5619				dev_err(vhost->dev, "Error after enable (rc=%d)\n", rc);
5620			}
5621		}
5622		break;
5623	case IBMVFC_HOST_ACTION_LOGO:
5624		vhost->job_step(vhost);
5625		break;
5626	case IBMVFC_HOST_ACTION_INIT:
5627		BUG_ON(vhost->state != IBMVFC_INITIALIZING);
5628		if (vhost->delay_init) {
5629			vhost->delay_init = 0;
5630			spin_unlock_irqrestore(vhost->host->host_lock, flags);
5631			ssleep(15);
5632			return;
5633		} else
5634			vhost->job_step(vhost);
5635		break;
5636	case IBMVFC_HOST_ACTION_QUERY:
5637		list_for_each_entry(tgt, &vhost->targets, queue)
5638			ibmvfc_init_tgt(tgt, ibmvfc_tgt_query_target);
5639		ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_QUERY_TGTS);
5640		break;
5641	case IBMVFC_HOST_ACTION_QUERY_TGTS:
5642		list_for_each_entry(tgt, &vhost->targets, queue) {
5643			if (tgt->action == IBMVFC_TGT_ACTION_INIT) {
5644				tgt->job_step(tgt);
5645				break;
5646			}
5647		}
5648
5649		if (!ibmvfc_dev_init_to_do(vhost))
5650			ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_TGT_DEL);
5651		break;
5652	case IBMVFC_HOST_ACTION_TGT_DEL:
5653	case IBMVFC_HOST_ACTION_TGT_DEL_FAILED:
5654		list_for_each_entry(tgt, &vhost->targets, queue) {
5655			if (tgt->action == IBMVFC_TGT_ACTION_LOGOUT_RPORT) {
5656				tgt->job_step(tgt);
5657				break;
5658			}
5659		}
5660
5661		if (ibmvfc_dev_logo_to_do(vhost)) {
5662			spin_unlock_irqrestore(vhost->host->host_lock, flags);
5663			return;
5664		}
5665
5666		list_for_each_entry(tgt, &vhost->targets, queue) {
5667			if (tgt->action == IBMVFC_TGT_ACTION_DEL_RPORT) {
5668				tgt_dbg(tgt, "Deleting rport\n");
5669				rport = tgt->rport;
5670				tgt->rport = NULL;
5671				list_del(&tgt->queue);
5672				ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DELETED_RPORT);
5673				spin_unlock_irqrestore(vhost->host->host_lock, flags);
5674				if (rport)
5675					fc_remote_port_delete(rport);
5676				timer_delete_sync(&tgt->timer);
5677				kref_put(&tgt->kref, ibmvfc_release_tgt);
5678				return;
5679			} else if (tgt->action == IBMVFC_TGT_ACTION_DEL_AND_LOGOUT_RPORT) {
5680				tgt_dbg(tgt, "Deleting rport with I/O outstanding\n");
5681				rport = tgt->rport;
5682				tgt->rport = NULL;
5683				tgt->init_retries = 0;
5684				ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_LOGOUT_DELETED_RPORT);
5685
5686				/*
5687				 * If fast fail is enabled, we wait for it to fire and then clean up
5688				 * the old port, since we expect the fast fail timer to clean up the
5689				 * outstanding I/O faster than waiting for normal command timeouts.
5690				 * However, if fast fail is disabled, any I/O outstanding to the
5691				 * rport LUNs will stay outstanding indefinitely, since the EH handlers
5692				 * won't get invoked for I/O's timing out. If this is a NPIV failover
5693				 * scenario, the better alternative is to use the move login.
5694				 */
5695				if (rport && rport->fast_io_fail_tmo == -1)
5696					tgt->move_login = 1;
5697				spin_unlock_irqrestore(vhost->host->host_lock, flags);
5698				if (rport)
5699					fc_remote_port_delete(rport);
5700				return;
5701			}
5702		}
5703
5704		if (vhost->state == IBMVFC_INITIALIZING) {
5705			if (vhost->action == IBMVFC_HOST_ACTION_TGT_DEL_FAILED) {
5706				if (vhost->reinit) {
5707					vhost->reinit = 0;
5708					scsi_block_requests(vhost->host);
5709					ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_QUERY);
5710					spin_unlock_irqrestore(vhost->host->host_lock, flags);
5711				} else {
5712					ibmvfc_set_host_state(vhost, IBMVFC_ACTIVE);
5713					ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_NONE);
5714					wake_up(&vhost->init_wait_q);
5715					schedule_work(&vhost->rport_add_work_q);
5716					vhost->init_retries = 0;
5717					spin_unlock_irqrestore(vhost->host->host_lock, flags);
5718					scsi_unblock_requests(vhost->host);
5719				}
5720
5721				return;
5722			} else {
5723				ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_INIT);
5724				vhost->job_step = ibmvfc_discover_targets;
5725			}
5726		} else {
5727			ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_NONE);
5728			spin_unlock_irqrestore(vhost->host->host_lock, flags);
5729			scsi_unblock_requests(vhost->host);
5730			wake_up(&vhost->init_wait_q);
5731			return;
5732		}
5733		break;
5734	case IBMVFC_HOST_ACTION_ALLOC_TGTS:
5735		ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_TGT_INIT);
5736		spin_unlock_irqrestore(vhost->host->host_lock, flags);
5737		ibmvfc_alloc_targets(vhost);
5738		spin_lock_irqsave(vhost->host->host_lock, flags);
5739		break;
5740	case IBMVFC_HOST_ACTION_TGT_INIT:
5741		list_for_each_entry(tgt, &vhost->targets, queue) {
5742			if (tgt->action == IBMVFC_TGT_ACTION_INIT) {
5743				tgt->job_step(tgt);
5744				break;
5745			}
5746		}
5747
5748		if (!ibmvfc_dev_init_to_do(vhost))
5749			ibmvfc_set_host_action(vhost, IBMVFC_HOST_ACTION_TGT_DEL_FAILED);
5750		break;
5751	default:
5752		break;
5753	}
5754
5755	spin_unlock_irqrestore(vhost->host->host_lock, flags);
5756}
5757
5758/**
5759 * ibmvfc_work - Do task level work
5760 * @data:		ibmvfc host struct
5761 *
5762 * Returns:
5763 *	zero
5764 **/
5765static int ibmvfc_work(void *data)
5766{
5767	struct ibmvfc_host *vhost = data;
5768	int rc;
5769
5770	set_user_nice(current, MIN_NICE);
5771
5772	while (1) {
5773		rc = wait_event_interruptible(vhost->work_wait_q,
5774					      ibmvfc_work_to_do(vhost));
5775
5776		BUG_ON(rc);
5777
5778		if (kthread_should_stop())
5779			break;
5780
5781		ibmvfc_do_work(vhost);
5782	}
5783
5784	ibmvfc_dbg(vhost, "ibmvfc kthread exiting...\n");
5785	return 0;
5786}
5787
5788/**
5789 * ibmvfc_alloc_queue - Allocate queue
5790 * @vhost:	ibmvfc host struct
5791 * @queue:	ibmvfc queue to allocate
5792 * @fmt:	queue format to allocate
5793 *
5794 * Returns:
5795 *	0 on success / non-zero on failure
5796 **/
5797static int ibmvfc_alloc_queue(struct ibmvfc_host *vhost,
5798			      struct ibmvfc_queue *queue,
5799			      enum ibmvfc_msg_fmt fmt)
5800{
5801	struct device *dev = vhost->dev;
5802	size_t fmt_size;
5803
5804	ENTER;
5805	spin_lock_init(&queue->_lock);
5806	queue->q_lock = &queue->_lock;
5807
5808	switch (fmt) {
5809	case IBMVFC_CRQ_FMT:
5810		fmt_size = sizeof(*queue->msgs.crq);
5811		queue->total_depth = scsi_qdepth + IBMVFC_NUM_INTERNAL_REQ;
5812		queue->evt_depth = scsi_qdepth;
5813		queue->reserved_depth = IBMVFC_NUM_INTERNAL_REQ;
5814		break;
5815	case IBMVFC_ASYNC_FMT:
5816		fmt_size = sizeof(*queue->msgs.async);
5817		break;
5818	case IBMVFC_SUB_CRQ_FMT:
5819		fmt_size = sizeof(*queue->msgs.scrq);
5820		/* We need one extra event for Cancel Commands */
5821		queue->total_depth = scsi_qdepth + IBMVFC_NUM_INTERNAL_SUBQ_REQ;
5822		queue->evt_depth = scsi_qdepth;
5823		queue->reserved_depth = IBMVFC_NUM_INTERNAL_SUBQ_REQ;
5824		break;
5825	default:
5826		dev_warn(dev, "Unknown command/response queue message format: %d\n", fmt);
5827		return -EINVAL;
5828	}
5829
5830	queue->fmt = fmt;
5831	if (ibmvfc_init_event_pool(vhost, queue)) {
5832		dev_err(dev, "Couldn't initialize event pool.\n");
5833		return -ENOMEM;
5834	}
5835
5836	queue->msgs.handle = (void *)get_zeroed_page(GFP_KERNEL);
5837	if (!queue->msgs.handle)
5838		return -ENOMEM;
5839
5840	queue->msg_token = dma_map_single(dev, queue->msgs.handle, PAGE_SIZE,
5841					  DMA_BIDIRECTIONAL);
5842
5843	if (dma_mapping_error(dev, queue->msg_token)) {
5844		free_page((unsigned long)queue->msgs.handle);
5845		queue->msgs.handle = NULL;
5846		return -ENOMEM;
5847	}
5848
5849	queue->cur = 0;
5850	queue->size = PAGE_SIZE / fmt_size;
5851
5852	queue->vhost = vhost;
5853	return 0;
5854}
5855
5856/**
5857 * ibmvfc_init_crq - Initializes and registers CRQ with hypervisor
5858 * @vhost:	ibmvfc host struct
5859 *
5860 * Allocates a page for messages, maps it for dma, and registers
5861 * the crq with the hypervisor.
5862 *
5863 * Return value:
5864 *	zero on success / other on failure
5865 **/
5866static int ibmvfc_init_crq(struct ibmvfc_host *vhost)
5867{
5868	int rc, retrc = -ENOMEM;
5869	struct device *dev = vhost->dev;
5870	struct vio_dev *vdev = to_vio_dev(dev);
5871	struct ibmvfc_queue *crq = &vhost->crq;
5872
5873	ENTER;
5874	if (ibmvfc_alloc_queue(vhost, crq, IBMVFC_CRQ_FMT))
5875		return -ENOMEM;
5876
5877	retrc = rc = plpar_hcall_norets(H_REG_CRQ, vdev->unit_address,
5878					crq->msg_token, PAGE_SIZE);
5879
5880	if (rc == H_RESOURCE)
5881		/* maybe kexecing and resource is busy. try a reset */
5882		retrc = rc = ibmvfc_reset_crq(vhost);
5883
5884	if (rc == H_CLOSED)
5885		dev_warn(dev, "Partner adapter not ready\n");
5886	else if (rc) {
5887		dev_warn(dev, "Error %d opening adapter\n", rc);
5888		goto reg_crq_failed;
5889	}
5890
5891	retrc = 0;
5892
5893	tasklet_init(&vhost->tasklet, (void *)ibmvfc_tasklet, (unsigned long)vhost);
5894
5895	if ((rc = request_irq(vdev->irq, ibmvfc_interrupt, 0, IBMVFC_NAME, vhost))) {
5896		dev_err(dev, "Couldn't register irq 0x%x. rc=%d\n", vdev->irq, rc);
5897		goto req_irq_failed;
5898	}
5899
5900	if ((rc = vio_enable_interrupts(vdev))) {
5901		dev_err(dev, "Error %d enabling interrupts\n", rc);
5902		goto req_irq_failed;
5903	}
5904
5905	LEAVE;
5906	return retrc;
5907
5908req_irq_failed:
5909	tasklet_kill(&vhost->tasklet);
5910	do {
5911		rc = plpar_hcall_norets(H_FREE_CRQ, vdev->unit_address);
5912	} while (rc == H_BUSY || H_IS_LONG_BUSY(rc));
5913reg_crq_failed:
5914	ibmvfc_free_queue(vhost, crq);
5915	return retrc;
5916}
5917
5918static int ibmvfc_register_channel(struct ibmvfc_host *vhost,
5919				   struct ibmvfc_channels *channels,
5920				   int index)
5921{
5922	struct device *dev = vhost->dev;
5923	struct vio_dev *vdev = to_vio_dev(dev);
5924	struct ibmvfc_queue *scrq = &channels->scrqs[index];
5925	int rc = -ENOMEM;
5926
5927	ENTER;
5928
5929	rc = h_reg_sub_crq(vdev->unit_address, scrq->msg_token, PAGE_SIZE,
5930			   &scrq->cookie, &scrq->hw_irq);
5931
5932	/* H_CLOSED indicates successful register, but no CRQ partner */
5933	if (rc && rc != H_CLOSED) {
5934		dev_warn(dev, "Error registering sub-crq: %d\n", rc);
5935		if (rc == H_PARAMETER)
5936			dev_warn_once(dev, "Firmware may not support MQ\n");
5937		goto reg_failed;
5938	}
5939
5940	scrq->irq = irq_create_mapping(NULL, scrq->hw_irq);
5941
5942	if (!scrq->irq) {
5943		rc = -EINVAL;
5944		dev_err(dev, "Error mapping sub-crq[%d] irq\n", index);
5945		goto irq_failed;
5946	}
5947
5948	switch (channels->protocol) {
5949	case IBMVFC_PROTO_SCSI:
5950		snprintf(scrq->name, sizeof(scrq->name), "ibmvfc-%x-scsi%d",
5951			 vdev->unit_address, index);
5952		scrq->handler = ibmvfc_interrupt_mq;
5953		break;
5954	case IBMVFC_PROTO_NVME:
5955		snprintf(scrq->name, sizeof(scrq->name), "ibmvfc-%x-nvmf%d",
5956			 vdev->unit_address, index);
5957		scrq->handler = ibmvfc_interrupt_mq;
5958		break;
5959	default:
5960		dev_err(dev, "Unknown channel protocol (%d)\n",
5961			channels->protocol);
5962		goto irq_failed;
5963	}
5964
5965	rc = request_irq(scrq->irq, scrq->handler, 0, scrq->name, scrq);
5966
5967	if (rc) {
5968		dev_err(dev, "Couldn't register sub-crq[%d] irq\n", index);
5969		irq_dispose_mapping(scrq->irq);
5970		goto irq_failed;
5971	}
5972
5973	scrq->hwq_id = index;
5974
5975	LEAVE;
5976	return 0;
5977
5978irq_failed:
5979	do {
5980		rc = plpar_hcall_norets(H_FREE_SUB_CRQ, vdev->unit_address, scrq->cookie);
5981	} while (rc == H_BUSY || H_IS_LONG_BUSY(rc));
5982reg_failed:
5983	LEAVE;
5984	return rc;
5985}
5986
5987static void ibmvfc_deregister_channel(struct ibmvfc_host *vhost,
5988				      struct ibmvfc_channels *channels,
5989				      int index)
5990{
5991	struct device *dev = vhost->dev;
5992	struct vio_dev *vdev = to_vio_dev(dev);
5993	struct ibmvfc_queue *scrq = &channels->scrqs[index];
5994	long rc;
5995
5996	ENTER;
5997
5998	free_irq(scrq->irq, scrq);
5999	irq_dispose_mapping(scrq->irq);
6000	scrq->irq = 0;
6001
6002	do {
6003		rc = plpar_hcall_norets(H_FREE_SUB_CRQ, vdev->unit_address,
6004					scrq->cookie);
6005	} while (rc == H_BUSY || H_IS_LONG_BUSY(rc));
6006
6007	if (rc)
6008		dev_err(dev, "Failed to free sub-crq[%d]: rc=%ld\n", index, rc);
6009
6010	/* Clean out the queue */
6011	memset(scrq->msgs.crq, 0, PAGE_SIZE);
6012	scrq->cur = 0;
6013
6014	LEAVE;
6015}
6016
6017static void ibmvfc_reg_sub_crqs(struct ibmvfc_host *vhost,
6018				struct ibmvfc_channels *channels)
6019{
6020	int i, j;
6021
6022	ENTER;
6023	if (!vhost->mq_enabled || !channels->scrqs)
6024		return;
6025
6026	for (i = 0; i < channels->max_queues; i++) {
6027		if (ibmvfc_register_channel(vhost, channels, i)) {
6028			for (j = i; j > 0; j--)
6029				ibmvfc_deregister_channel(vhost, channels, j - 1);
6030			vhost->do_enquiry = 0;
6031			return;
6032		}
6033	}
6034
6035	LEAVE;
6036}
6037
6038static void ibmvfc_dereg_sub_crqs(struct ibmvfc_host *vhost,
6039				  struct ibmvfc_channels *channels)
6040{
6041	int i;
6042
6043	ENTER;
6044	if (!vhost->mq_enabled || !channels->scrqs)
6045		return;
6046
6047	for (i = 0; i < channels->max_queues; i++)
6048		ibmvfc_deregister_channel(vhost, channels, i);
6049
6050	LEAVE;
6051}
6052
6053static int ibmvfc_alloc_channels(struct ibmvfc_host *vhost,
6054				 struct ibmvfc_channels *channels)
6055{
6056	struct ibmvfc_queue *scrq;
6057	int i, j;
6058	int rc = 0;
6059
6060	channels->scrqs = kcalloc(channels->max_queues,
6061				  sizeof(*channels->scrqs),
6062				  GFP_KERNEL);
6063	if (!channels->scrqs)
6064		return -ENOMEM;
6065
6066	for (i = 0; i < channels->max_queues; i++) {
6067		scrq = &channels->scrqs[i];
6068		rc = ibmvfc_alloc_queue(vhost, scrq, IBMVFC_SUB_CRQ_FMT);
6069		if (rc) {
6070			for (j = i; j > 0; j--) {
6071				scrq = &channels->scrqs[j - 1];
6072				ibmvfc_free_queue(vhost, scrq);
6073			}
6074			kfree(channels->scrqs);
6075			channels->scrqs = NULL;
6076			channels->active_queues = 0;
6077			return rc;
6078		}
6079	}
6080
6081	return rc;
6082}
6083
6084static void ibmvfc_init_sub_crqs(struct ibmvfc_host *vhost)
6085{
6086	ENTER;
6087	if (!vhost->mq_enabled)
6088		return;
6089
6090	if (ibmvfc_alloc_channels(vhost, &vhost->scsi_scrqs)) {
6091		vhost->do_enquiry = 0;
6092		vhost->mq_enabled = 0;
6093		return;
6094	}
6095
6096	ibmvfc_reg_sub_crqs(vhost, &vhost->scsi_scrqs);
6097
6098	LEAVE;
6099}
6100
6101static void ibmvfc_release_channels(struct ibmvfc_host *vhost,
6102				    struct ibmvfc_channels *channels)
6103{
6104	struct ibmvfc_queue *scrq;
6105	int i;
6106
6107	if (channels->scrqs) {
6108		for (i = 0; i < channels->max_queues; i++) {
6109			scrq = &channels->scrqs[i];
6110			ibmvfc_free_queue(vhost, scrq);
6111		}
6112
6113		kfree(channels->scrqs);
6114		channels->scrqs = NULL;
6115		channels->active_queues = 0;
6116	}
6117}
6118
6119static void ibmvfc_release_sub_crqs(struct ibmvfc_host *vhost)
6120{
6121	ENTER;
6122	if (!vhost->scsi_scrqs.scrqs)
6123		return;
6124
6125	ibmvfc_dereg_sub_crqs(vhost, &vhost->scsi_scrqs);
6126
6127	ibmvfc_release_channels(vhost, &vhost->scsi_scrqs);
6128	LEAVE;
6129}
6130
6131static void ibmvfc_free_disc_buf(struct device *dev, struct ibmvfc_channels *channels)
6132{
6133	dma_free_coherent(dev, channels->disc_buf_sz, channels->disc_buf,
6134			  channels->disc_buf_dma);
6135}
6136
6137/**
6138 * ibmvfc_free_mem - Free memory for vhost
6139 * @vhost:	ibmvfc host struct
6140 *
6141 * Return value:
6142 * 	none
6143 **/
6144static void ibmvfc_free_mem(struct ibmvfc_host *vhost)
6145{
6146	struct ibmvfc_queue *async_q = &vhost->async_crq;
6147
6148	ENTER;
6149	mempool_destroy(vhost->tgt_pool);
6150	kfree(vhost->trace);
6151	ibmvfc_free_disc_buf(vhost->dev, &vhost->scsi_scrqs);
6152	dma_free_coherent(vhost->dev, sizeof(*vhost->login_buf),
6153			  vhost->login_buf, vhost->login_buf_dma);
6154	dma_free_coherent(vhost->dev, sizeof(*vhost->channel_setup_buf),
6155			  vhost->channel_setup_buf, vhost->channel_setup_dma);
6156	dma_pool_destroy(vhost->sg_pool);
6157	ibmvfc_free_queue(vhost, async_q);
6158	LEAVE;
6159}
6160
6161static int ibmvfc_alloc_disc_buf(struct device *dev, struct ibmvfc_channels *channels)
6162{
6163	channels->disc_buf_sz = sizeof(*channels->disc_buf) * max_targets;
6164	channels->disc_buf = dma_alloc_coherent(dev, channels->disc_buf_sz,
6165					     &channels->disc_buf_dma, GFP_KERNEL);
6166
6167	if (!channels->disc_buf) {
6168		dev_err(dev, "Couldn't allocate %s Discover Targets buffer\n",
6169			(channels->protocol == IBMVFC_PROTO_SCSI) ? "SCSI" : "NVMe");
6170		return -ENOMEM;
6171	}
6172
6173	return 0;
6174}
6175
6176/**
6177 * ibmvfc_alloc_mem - Allocate memory for vhost
6178 * @vhost:	ibmvfc host struct
6179 *
6180 * Return value:
6181 * 	0 on success / non-zero on failure
6182 **/
6183static int ibmvfc_alloc_mem(struct ibmvfc_host *vhost)
6184{
6185	struct ibmvfc_queue *async_q = &vhost->async_crq;
6186	struct device *dev = vhost->dev;
6187
6188	ENTER;
6189	if (ibmvfc_alloc_queue(vhost, async_q, IBMVFC_ASYNC_FMT)) {
6190		dev_err(dev, "Couldn't allocate/map async queue.\n");
6191		goto nomem;
6192	}
6193
6194	vhost->sg_pool = dma_pool_create(IBMVFC_NAME, dev,
6195					 SG_ALL * sizeof(struct srp_direct_buf),
6196					 sizeof(struct srp_direct_buf), 0);
6197
6198	if (!vhost->sg_pool) {
6199		dev_err(dev, "Failed to allocate sg pool\n");
6200		goto unmap_async_crq;
6201	}
6202
6203	vhost->login_buf = dma_alloc_coherent(dev, sizeof(*vhost->login_buf),
6204					      &vhost->login_buf_dma, GFP_KERNEL);
6205
6206	if (!vhost->login_buf) {
6207		dev_err(dev, "Couldn't allocate NPIV login buffer\n");
6208		goto free_sg_pool;
6209	}
6210
6211	if (ibmvfc_alloc_disc_buf(dev, &vhost->scsi_scrqs))
6212		goto free_login_buffer;
6213
6214	vhost->trace = kcalloc(IBMVFC_NUM_TRACE_ENTRIES,
6215			       sizeof(struct ibmvfc_trace_entry), GFP_KERNEL);
6216	atomic_set(&vhost->trace_index, -1);
6217
6218	if (!vhost->trace)
6219		goto free_scsi_disc_buffer;
6220
6221	vhost->tgt_pool = mempool_create_kmalloc_pool(IBMVFC_TGT_MEMPOOL_SZ,
6222						      sizeof(struct ibmvfc_target));
6223
6224	if (!vhost->tgt_pool) {
6225		dev_err(dev, "Couldn't allocate target memory pool\n");
6226		goto free_trace;
6227	}
6228
6229	vhost->channel_setup_buf = dma_alloc_coherent(dev, sizeof(*vhost->channel_setup_buf),
6230						      &vhost->channel_setup_dma,
6231						      GFP_KERNEL);
6232
6233	if (!vhost->channel_setup_buf) {
6234		dev_err(dev, "Couldn't allocate Channel Setup buffer\n");
6235		goto free_tgt_pool;
6236	}
6237
6238	LEAVE;
6239	return 0;
6240
6241free_tgt_pool:
6242	mempool_destroy(vhost->tgt_pool);
6243free_trace:
6244	kfree(vhost->trace);
6245free_scsi_disc_buffer:
6246	ibmvfc_free_disc_buf(dev, &vhost->scsi_scrqs);
6247free_login_buffer:
6248	dma_free_coherent(dev, sizeof(*vhost->login_buf),
6249			  vhost->login_buf, vhost->login_buf_dma);
6250free_sg_pool:
6251	dma_pool_destroy(vhost->sg_pool);
6252unmap_async_crq:
6253	ibmvfc_free_queue(vhost, async_q);
6254nomem:
6255	LEAVE;
6256	return -ENOMEM;
6257}
6258
6259/**
6260 * ibmvfc_rport_add_thread - Worker thread for rport adds
6261 * @work:	work struct
6262 *
6263 **/
6264static void ibmvfc_rport_add_thread(struct work_struct *work)
6265{
6266	struct ibmvfc_host *vhost = container_of(work, struct ibmvfc_host,
6267						 rport_add_work_q);
6268	struct ibmvfc_target *tgt;
6269	struct fc_rport *rport;
6270	unsigned long flags;
6271	int did_work;
6272
6273	ENTER;
6274	spin_lock_irqsave(vhost->host->host_lock, flags);
6275	do {
6276		did_work = 0;
6277		if (vhost->state != IBMVFC_ACTIVE)
6278			break;
6279
6280		list_for_each_entry(tgt, &vhost->targets, queue) {
6281			if (tgt->add_rport) {
6282				did_work = 1;
6283				tgt->add_rport = 0;
6284				kref_get(&tgt->kref);
6285				rport = tgt->rport;
6286				if (!rport) {
6287					spin_unlock_irqrestore(vhost->host->host_lock, flags);
6288					ibmvfc_tgt_add_rport(tgt);
6289				} else if (get_device(&rport->dev)) {
6290					spin_unlock_irqrestore(vhost->host->host_lock, flags);
6291					tgt_dbg(tgt, "Setting rport roles\n");
6292					fc_remote_port_rolechg(rport, tgt->ids.roles);
6293					put_device(&rport->dev);
6294				} else {
6295					spin_unlock_irqrestore(vhost->host->host_lock, flags);
6296				}
6297
6298				kref_put(&tgt->kref, ibmvfc_release_tgt);
6299				spin_lock_irqsave(vhost->host->host_lock, flags);
6300				break;
6301			}
6302		}
6303	} while(did_work);
6304
6305	if (vhost->state == IBMVFC_ACTIVE)
6306		vhost->scan_complete = 1;
6307	spin_unlock_irqrestore(vhost->host->host_lock, flags);
6308	LEAVE;
6309}
6310
6311/**
6312 * ibmvfc_probe - Adapter hot plug add entry point
6313 * @vdev:	vio device struct
6314 * @id:	vio device id struct
6315 *
6316 * Return value:
6317 * 	0 on success / non-zero on failure
6318 **/
6319static int ibmvfc_probe(struct vio_dev *vdev, const struct vio_device_id *id)
6320{
6321	struct ibmvfc_host *vhost;
6322	struct Scsi_Host *shost;
6323	struct device *dev = &vdev->dev;
6324	int rc = -ENOMEM;
6325	unsigned int online_cpus = num_online_cpus();
6326	unsigned int max_scsi_queues = min((unsigned int)IBMVFC_MAX_SCSI_QUEUES, online_cpus);
6327
6328	ENTER;
6329	shost = scsi_host_alloc(&driver_template, sizeof(*vhost));
6330	if (!shost) {
6331		dev_err(dev, "Couldn't allocate host data\n");
6332		goto out;
6333	}
6334
6335	shost->transportt = ibmvfc_transport_template;
6336	shost->can_queue = scsi_qdepth;
6337	shost->max_lun = max_lun;
6338	shost->max_id = max_targets;
6339	shost->max_sectors = max_sectors;
6340	shost->max_cmd_len = IBMVFC_MAX_CDB_LEN;
6341	shost->unique_id = shost->host_no;
6342	shost->nr_hw_queues = mq_enabled ? min(max_scsi_queues, nr_scsi_hw_queues) : 1;
6343
6344	vhost = shost_priv(shost);
6345	INIT_LIST_HEAD(&vhost->targets);
6346	INIT_LIST_HEAD(&vhost->purge);
6347	sprintf(vhost->name, IBMVFC_NAME);
6348	vhost->host = shost;
6349	vhost->dev = dev;
6350	vhost->partition_number = -1;
6351	vhost->log_level = log_level;
6352	vhost->task_set = 1;
6353
6354	vhost->mq_enabled = mq_enabled;
6355	vhost->scsi_scrqs.desired_queues = min(shost->nr_hw_queues, nr_scsi_channels);
6356	vhost->scsi_scrqs.max_queues = shost->nr_hw_queues;
6357	vhost->scsi_scrqs.protocol = IBMVFC_PROTO_SCSI;
6358	vhost->using_channels = 0;
6359	vhost->do_enquiry = 1;
6360	vhost->scan_timeout = 0;
6361
6362	strcpy(vhost->partition_name, "UNKNOWN");
6363	init_waitqueue_head(&vhost->work_wait_q);
6364	init_waitqueue_head(&vhost->init_wait_q);
6365	INIT_WORK(&vhost->rport_add_work_q, ibmvfc_rport_add_thread);
6366	mutex_init(&vhost->passthru_mutex);
6367
6368	if ((rc = ibmvfc_alloc_mem(vhost)))
6369		goto free_scsi_host;
6370
6371	vhost->work_thread = kthread_run(ibmvfc_work, vhost, "%s_%d", IBMVFC_NAME,
6372					 shost->host_no);
6373
6374	if (IS_ERR(vhost->work_thread)) {
6375		dev_err(dev, "Couldn't create kernel thread: %ld\n",
6376			PTR_ERR(vhost->work_thread));
6377		rc = PTR_ERR(vhost->work_thread);
6378		goto free_host_mem;
6379	}
6380
6381	if ((rc = ibmvfc_init_crq(vhost))) {
6382		dev_err(dev, "Couldn't initialize crq. rc=%d\n", rc);
6383		goto kill_kthread;
6384	}
6385
6386	if ((rc = scsi_add_host(shost, dev)))
6387		goto release_crq;
6388
6389	fc_host_dev_loss_tmo(shost) = IBMVFC_DEV_LOSS_TMO;
6390
6391	if ((rc = ibmvfc_create_trace_file(&shost->shost_dev.kobj,
6392					   &ibmvfc_trace_attr))) {
6393		dev_err(dev, "Failed to create trace file. rc=%d\n", rc);
6394		goto remove_shost;
6395	}
6396
6397	ibmvfc_init_sub_crqs(vhost);
6398
6399	dev_set_drvdata(dev, vhost);
6400	spin_lock(&ibmvfc_driver_lock);
6401	list_add_tail(&vhost->queue, &ibmvfc_head);
6402	spin_unlock(&ibmvfc_driver_lock);
6403
6404	ibmvfc_send_crq_init(vhost);
6405	scsi_scan_host(shost);
6406	return 0;
6407
6408remove_shost:
6409	scsi_remove_host(shost);
6410release_crq:
6411	ibmvfc_release_crq_queue(vhost);
6412kill_kthread:
6413	kthread_stop(vhost->work_thread);
6414free_host_mem:
6415	ibmvfc_free_mem(vhost);
6416free_scsi_host:
6417	scsi_host_put(shost);
6418out:
6419	LEAVE;
6420	return rc;
6421}
6422
6423/**
6424 * ibmvfc_remove - Adapter hot plug remove entry point
6425 * @vdev:	vio device struct
6426 *
6427 * Return value:
6428 * 	0
6429 **/
6430static void ibmvfc_remove(struct vio_dev *vdev)
6431{
6432	struct ibmvfc_host *vhost = dev_get_drvdata(&vdev->dev);
6433	LIST_HEAD(purge);
6434	unsigned long flags;
6435
6436	ENTER;
6437	ibmvfc_remove_trace_file(&vhost->host->shost_dev.kobj, &ibmvfc_trace_attr);
6438
6439	spin_lock_irqsave(vhost->host->host_lock, flags);
6440	ibmvfc_link_down(vhost, IBMVFC_HOST_OFFLINE);
6441	spin_unlock_irqrestore(vhost->host->host_lock, flags);
6442
6443	ibmvfc_wait_while_resetting(vhost);
6444	kthread_stop(vhost->work_thread);
6445	fc_remove_host(vhost->host);
6446	scsi_remove_host(vhost->host);
6447
6448	spin_lock_irqsave(vhost->host->host_lock, flags);
6449	ibmvfc_purge_requests(vhost, DID_ERROR);
6450	list_splice_init(&vhost->purge, &purge);
6451	spin_unlock_irqrestore(vhost->host->host_lock, flags);
6452	ibmvfc_complete_purge(&purge);
6453	ibmvfc_release_sub_crqs(vhost);
6454	ibmvfc_release_crq_queue(vhost);
6455
6456	ibmvfc_free_mem(vhost);
6457	spin_lock(&ibmvfc_driver_lock);
6458	list_del(&vhost->queue);
6459	spin_unlock(&ibmvfc_driver_lock);
6460	scsi_host_put(vhost->host);
6461	LEAVE;
6462}
6463
6464/**
6465 * ibmvfc_resume - Resume from suspend
6466 * @dev:	device struct
6467 *
6468 * We may have lost an interrupt across suspend/resume, so kick the
6469 * interrupt handler
6470 *
6471 */
6472static int ibmvfc_resume(struct device *dev)
6473{
6474	unsigned long flags;
6475	struct ibmvfc_host *vhost = dev_get_drvdata(dev);
6476	struct vio_dev *vdev = to_vio_dev(dev);
6477
6478	spin_lock_irqsave(vhost->host->host_lock, flags);
6479	vio_disable_interrupts(vdev);
6480	tasklet_schedule(&vhost->tasklet);
6481	spin_unlock_irqrestore(vhost->host->host_lock, flags);
6482	return 0;
6483}
6484
6485/**
6486 * ibmvfc_get_desired_dma - Calculate DMA resources needed by the driver
6487 * @vdev:	vio device struct
6488 *
6489 * Return value:
6490 *	Number of bytes the driver will need to DMA map at the same time in
6491 *	order to perform well.
6492 */
6493static unsigned long ibmvfc_get_desired_dma(struct vio_dev *vdev)
6494{
6495	unsigned long pool_dma;
6496
6497	pool_dma = (IBMVFC_MAX_SCSI_QUEUES * scsi_qdepth) * sizeof(union ibmvfc_iu);
6498	return pool_dma + ((512 * 1024) * driver_template.cmd_per_lun);
6499}
6500
6501static const struct vio_device_id ibmvfc_device_table[] = {
6502	{"fcp", "IBM,vfc-client"},
6503	{ "", "" }
6504};
6505MODULE_DEVICE_TABLE(vio, ibmvfc_device_table);
6506
6507static const struct dev_pm_ops ibmvfc_pm_ops = {
6508	.resume = ibmvfc_resume
6509};
6510
6511static struct vio_driver ibmvfc_driver = {
6512	.id_table = ibmvfc_device_table,
6513	.probe = ibmvfc_probe,
6514	.remove = ibmvfc_remove,
6515	.get_desired_dma = ibmvfc_get_desired_dma,
6516	.name = IBMVFC_NAME,
6517	.pm = &ibmvfc_pm_ops,
6518};
6519
6520static struct fc_function_template ibmvfc_transport_functions = {
6521	.show_host_fabric_name = 1,
6522	.show_host_node_name = 1,
6523	.show_host_port_name = 1,
6524	.show_host_supported_classes = 1,
6525	.show_host_port_type = 1,
6526	.show_host_port_id = 1,
6527	.show_host_maxframe_size = 1,
6528
6529	.get_host_port_state = ibmvfc_get_host_port_state,
6530	.show_host_port_state = 1,
6531
6532	.get_host_speed = ibmvfc_get_host_speed,
6533	.show_host_speed = 1,
6534
6535	.issue_fc_host_lip = ibmvfc_issue_fc_host_lip,
6536	.terminate_rport_io = ibmvfc_terminate_rport_io,
6537
6538	.show_rport_maxframe_size = 1,
6539	.show_rport_supported_classes = 1,
6540
6541	.set_rport_dev_loss_tmo = ibmvfc_set_rport_dev_loss_tmo,
6542	.show_rport_dev_loss_tmo = 1,
6543
6544	.get_starget_node_name = ibmvfc_get_starget_node_name,
6545	.show_starget_node_name = 1,
6546
6547	.get_starget_port_name = ibmvfc_get_starget_port_name,
6548	.show_starget_port_name = 1,
6549
6550	.get_starget_port_id = ibmvfc_get_starget_port_id,
6551	.show_starget_port_id = 1,
6552
6553	.max_bsg_segments = 1,
6554	.bsg_request = ibmvfc_bsg_request,
6555	.bsg_timeout = ibmvfc_bsg_timeout,
6556};
6557
6558/**
6559 * ibmvfc_module_init - Initialize the ibmvfc module
6560 *
6561 * Return value:
6562 * 	0 on success / other on failure
6563 **/
6564static int __init ibmvfc_module_init(void)
6565{
6566	int min_max_sectors = PAGE_SIZE >> 9;
6567	int rc;
6568
6569	if (!firmware_has_feature(FW_FEATURE_VIO))
6570		return -ENODEV;
6571
6572	printk(KERN_INFO IBMVFC_NAME": IBM Virtual Fibre Channel Driver version: %s %s\n",
6573	       IBMVFC_DRIVER_VERSION, IBMVFC_DRIVER_DATE);
6574
6575	/*
6576	 * Range check the max_sectors module parameter. The upper bounds is
6577	 * implicity checked since the parameter is a ushort.
6578	 */
6579	if (max_sectors < min_max_sectors) {
6580		printk(KERN_ERR IBMVFC_NAME ": max_sectors must be at least %d.\n",
6581			min_max_sectors);
6582		max_sectors = min_max_sectors;
6583	}
6584
6585	ibmvfc_transport_template = fc_attach_transport(&ibmvfc_transport_functions);
6586	if (!ibmvfc_transport_template)
6587		return -ENOMEM;
6588
6589	rc = vio_register_driver(&ibmvfc_driver);
6590	if (rc)
6591		fc_release_transport(ibmvfc_transport_template);
6592	return rc;
6593}
6594
6595/**
6596 * ibmvfc_module_exit - Teardown the ibmvfc module
6597 *
6598 * Return value:
6599 * 	nothing
6600 **/
6601static void __exit ibmvfc_module_exit(void)
6602{
6603	vio_unregister_driver(&ibmvfc_driver);
6604	fc_release_transport(ibmvfc_transport_template);
6605}
6606
6607module_init(ibmvfc_module_init);
6608module_exit(ibmvfc_module_exit);