sas_expander.c

   1// SPDX-License-Identifier: GPL-2.0
   2/*
   3 * Serial Attached SCSI (SAS) Expander discovery and configuration
   4 *
   5 * Copyright (C) 2005 Adaptec, Inc.  All rights reserved.
   6 * Copyright (C) 2005 Luben Tuikov <luben_tuikov@adaptec.com>
   7 *
   8 * This file is licensed under GPLv2.
   9 */
  10
  11#include <linux/scatterlist.h>
  12#include <linux/blkdev.h>
  13#include <linux/slab.h>
  14#include <linux/unaligned.h>
  15
  16#include "sas_internal.h"
  17
  18#include <scsi/sas_ata.h>
  19#include <scsi/scsi_transport.h>
  20#include <scsi/scsi_transport_sas.h>
  21#include "scsi_sas_internal.h"
  22
  23static int sas_discover_expander(struct domain_device *dev);
  24static int sas_configure_routing(struct domain_device *dev, u8 *sas_addr);
  25static int sas_configure_phy(struct domain_device *dev, int phy_id,
  26			     u8 *sas_addr, int include);
  27static int sas_disable_routing(struct domain_device *dev,  u8 *sas_addr);
  28
  29static void sas_port_add_ex_phy(struct sas_port *port, struct ex_phy *ex_phy)
  30{
  31	sas_port_add_phy(port, ex_phy->phy);
  32	ex_phy->port = port;
  33	ex_phy->phy_state = PHY_DEVICE_DISCOVERED;
  34}
  35
  36static void sas_ex_add_parent_port(struct domain_device *dev, int phy_id)
  37{
  38	struct expander_device *ex = &dev->ex_dev;
  39	struct ex_phy *ex_phy = &ex->ex_phy[phy_id];
  40
  41	if (!ex->parent_port) {
  42		ex->parent_port = sas_port_alloc(&dev->rphy->dev, phy_id);
  43		/* FIXME: error handling */
  44		BUG_ON(!ex->parent_port);
  45		BUG_ON(sas_port_add(ex->parent_port));
  46		sas_port_mark_backlink(ex->parent_port);
  47	}
  48	sas_port_add_ex_phy(ex->parent_port, ex_phy);
  49}
  50
  51/* ---------- SMP task management ---------- */
  52
  53/* Give it some long enough timeout. In seconds. */
  54#define SMP_TIMEOUT 10
  55
  56static int smp_execute_task_sg(struct domain_device *dev,
  57		struct scatterlist *req, struct scatterlist *resp)
  58{
  59	int res, retry;
  60	struct sas_task *task = NULL;
  61	struct sas_internal *i =
  62		to_sas_internal(dev->port->ha->shost->transportt);
  63	struct sas_ha_struct *ha = dev->port->ha;
  64
  65	pm_runtime_get_sync(ha->dev);
  66	mutex_lock(&dev->ex_dev.cmd_mutex);
  67	for (retry = 0; retry < 3; retry++) {
  68		if (test_bit(SAS_DEV_GONE, &dev->state)) {
  69			res = -ECOMM;
  70			break;
  71		}
  72
  73		task = sas_alloc_slow_task(GFP_KERNEL);
  74		if (!task) {
  75			res = -ENOMEM;
  76			break;
  77		}
  78		task->dev = dev;
  79		task->task_proto = dev->tproto;
  80		task->smp_task.smp_req = *req;
  81		task->smp_task.smp_resp = *resp;
  82
  83		task->task_done = sas_task_internal_done;
  84
  85		task->slow_task->timer.function = sas_task_internal_timedout;
  86		task->slow_task->timer.expires = jiffies + SMP_TIMEOUT*HZ;
  87		add_timer(&task->slow_task->timer);
  88
  89		res = i->dft->lldd_execute_task(task, GFP_KERNEL);
  90
  91		if (res) {
  92			timer_delete_sync(&task->slow_task->timer);
  93			pr_notice("executing SMP task failed:%d\n", res);
  94			break;
  95		}
  96
  97		wait_for_completion(&task->slow_task->completion);
  98		res = -ECOMM;
  99		if ((task->task_state_flags & SAS_TASK_STATE_ABORTED)) {
 100			pr_notice("smp task timed out or aborted\n");
 101			i->dft->lldd_abort_task(task);
 102			if (!(task->task_state_flags & SAS_TASK_STATE_DONE)) {
 103				pr_notice("SMP task aborted and not done\n");
 104				break;
 105			}
 106		}
 107		if (task->task_status.resp == SAS_TASK_COMPLETE &&
 108		    task->task_status.stat == SAS_SAM_STAT_GOOD) {
 109			res = 0;
 110			break;
 111		}
 112		if (task->task_status.resp == SAS_TASK_COMPLETE &&
 113		    task->task_status.stat == SAS_DATA_UNDERRUN) {
 114			/* no error, but return the number of bytes of
 115			 * underrun */
 116			res = task->task_status.residual;
 117			break;
 118		}
 119		if (task->task_status.resp == SAS_TASK_COMPLETE &&
 120		    task->task_status.stat == SAS_DATA_OVERRUN) {
 121			res = -EMSGSIZE;
 122			break;
 123		}
 124		if (task->task_status.resp == SAS_TASK_UNDELIVERED &&
 125		    task->task_status.stat == SAS_DEVICE_UNKNOWN)
 126			break;
 127		else {
 128			pr_notice("%s: task to dev %016llx response: 0x%x status 0x%x\n",
 129				  __func__,
 130				  SAS_ADDR(dev->sas_addr),
 131				  task->task_status.resp,
 132				  task->task_status.stat);
 133			sas_free_task(task);
 134			task = NULL;
 135		}
 136	}
 137	mutex_unlock(&dev->ex_dev.cmd_mutex);
 138	pm_runtime_put_sync(ha->dev);
 139
 140	BUG_ON(retry == 3 && task != NULL);
 141	sas_free_task(task);
 142	return res;
 143}
 144
 145static int smp_execute_task(struct domain_device *dev, void *req, int req_size,
 146			    void *resp, int resp_size)
 147{
 148	struct scatterlist req_sg;
 149	struct scatterlist resp_sg;
 150
 151	sg_init_one(&req_sg, req, req_size);
 152	sg_init_one(&resp_sg, resp, resp_size);
 153	return smp_execute_task_sg(dev, &req_sg, &resp_sg);
 154}
 155
 156/* ---------- Allocations ---------- */
 157
 158static inline void *alloc_smp_req(int size)
 159{
 160	u8 *p = kzalloc(ALIGN(size, ARCH_DMA_MINALIGN), GFP_KERNEL);
 161	if (p)
 162		p[0] = SMP_REQUEST;
 163	return p;
 164}
 165
 166static inline void *alloc_smp_resp(int size)
 167{
 168	return kzalloc(size, GFP_KERNEL);
 169}
 170
 171static char sas_route_char(struct domain_device *dev, struct ex_phy *phy)
 172{
 173	switch (phy->routing_attr) {
 174	case TABLE_ROUTING:
 175		if (dev->ex_dev.t2t_supp)
 176			return 'U';
 177		else
 178			return 'T';
 179	case DIRECT_ROUTING:
 180		return 'D';
 181	case SUBTRACTIVE_ROUTING:
 182		return 'S';
 183	default:
 184		return '?';
 185	}
 186}
 187
 188static enum sas_device_type to_dev_type(struct discover_resp *dr)
 189{
 190	/* This is detecting a failure to transmit initial dev to host
 191	 * FIS as described in section J.5 of sas-2 r16
 192	 */
 193	if (dr->attached_dev_type == SAS_PHY_UNUSED && dr->attached_sata_dev &&
 194	    dr->linkrate >= SAS_LINK_RATE_1_5_GBPS)
 195		return SAS_SATA_PENDING;
 196	else
 197		return dr->attached_dev_type;
 198}
 199
 200static void sas_set_ex_phy(struct domain_device *dev, int phy_id,
 201			   struct smp_disc_resp *disc_resp)
 202{
 203	enum sas_device_type dev_type;
 204	enum sas_linkrate linkrate;
 205	u8 sas_addr[SAS_ADDR_SIZE];
 206	struct discover_resp *dr = &disc_resp->disc;
 207	struct sas_ha_struct *ha = dev->port->ha;
 208	struct expander_device *ex = &dev->ex_dev;
 209	struct ex_phy *phy = &ex->ex_phy[phy_id];
 210	struct sas_rphy *rphy = dev->rphy;
 211	bool new_phy = !phy->phy;
 212	char *type;
 213
 214	if (new_phy) {
 215		if (WARN_ON_ONCE(test_bit(SAS_HA_ATA_EH_ACTIVE, &ha->state)))
 216			return;
 217		phy->phy = sas_phy_alloc(&rphy->dev, phy_id);
 218
 219		/* FIXME: error_handling */
 220		BUG_ON(!phy->phy);
 221	}
 222
 223	switch (disc_resp->result) {
 224	case SMP_RESP_PHY_VACANT:
 225		phy->phy_state = PHY_VACANT;
 226		break;
 227	default:
 228		phy->phy_state = PHY_NOT_PRESENT;
 229		break;
 230	case SMP_RESP_FUNC_ACC:
 231		phy->phy_state = PHY_EMPTY; /* do not know yet */
 232		break;
 233	}
 234
 235	/* check if anything important changed to squelch debug */
 236	dev_type = phy->attached_dev_type;
 237	linkrate  = phy->linkrate;
 238	memcpy(sas_addr, phy->attached_sas_addr, SAS_ADDR_SIZE);
 239
 240	/* Handle vacant phy - rest of dr data is not valid so skip it */
 241	if (phy->phy_state == PHY_VACANT) {
 242		memset(phy->attached_sas_addr, 0, SAS_ADDR_SIZE);
 243		phy->attached_dev_type = SAS_PHY_UNUSED;
 244		if (!test_bit(SAS_HA_ATA_EH_ACTIVE, &ha->state)) {
 245			phy->phy_id = phy_id;
 246			goto skip;
 247		} else
 248			goto out;
 249	}
 250
 251	phy->attached_dev_type = to_dev_type(dr);
 252	if (test_bit(SAS_HA_ATA_EH_ACTIVE, &ha->state))
 253		goto out;
 254	phy->phy_id = phy_id;
 255	phy->linkrate = dr->linkrate;
 256	phy->attached_sata_host = dr->attached_sata_host;
 257	phy->attached_sata_dev  = dr->attached_sata_dev;
 258	phy->attached_sata_ps   = dr->attached_sata_ps;
 259	phy->attached_iproto = dr->iproto << 1;
 260	phy->attached_tproto = dr->tproto << 1;
 261	/* help some expanders that fail to zero sas_address in the 'no
 262	 * device' case
 263	 */
 264	if (phy->attached_dev_type == SAS_PHY_UNUSED)
 265		memset(phy->attached_sas_addr, 0, SAS_ADDR_SIZE);
 266	else
 267		memcpy(phy->attached_sas_addr, dr->attached_sas_addr, SAS_ADDR_SIZE);
 268	phy->attached_phy_id = dr->attached_phy_id;
 269	phy->phy_change_count = dr->change_count;
 270	phy->routing_attr = dr->routing_attr;
 271	phy->virtual = dr->virtual;
 272	phy->last_da_index = -1;
 273
 274	phy->phy->identify.sas_address = SAS_ADDR(phy->attached_sas_addr);
 275	phy->phy->identify.device_type = dr->attached_dev_type;
 276	phy->phy->identify.initiator_port_protocols = phy->attached_iproto;
 277	phy->phy->identify.target_port_protocols = phy->attached_tproto;
 278	if (!phy->attached_tproto && dr->attached_sata_dev)
 279		phy->phy->identify.target_port_protocols = SAS_PROTOCOL_SATA;
 280	phy->phy->identify.phy_identifier = phy_id;
 281	phy->phy->minimum_linkrate_hw = dr->hmin_linkrate;
 282	phy->phy->maximum_linkrate_hw = dr->hmax_linkrate;
 283	phy->phy->minimum_linkrate = dr->pmin_linkrate;
 284	phy->phy->maximum_linkrate = dr->pmax_linkrate;
 285	phy->phy->negotiated_linkrate = phy->linkrate;
 286	phy->phy->enabled = (phy->linkrate != SAS_PHY_DISABLED);
 287
 288 skip:
 289	if (new_phy)
 290		if (sas_phy_add(phy->phy)) {
 291			sas_phy_free(phy->phy);
 292			return;
 293		}
 294
 295 out:
 296	switch (phy->attached_dev_type) {
 297	case SAS_SATA_PENDING:
 298		type = "stp pending";
 299		break;
 300	case SAS_PHY_UNUSED:
 301		type = "no device";
 302		break;
 303	case SAS_END_DEVICE:
 304		if (phy->attached_iproto) {
 305			if (phy->attached_tproto)
 306				type = "host+target";
 307			else
 308				type = "host";
 309		} else {
 310			if (dr->attached_sata_dev)
 311				type = "stp";
 312			else
 313				type = "ssp";
 314		}
 315		break;
 316	case SAS_EDGE_EXPANDER_DEVICE:
 317	case SAS_FANOUT_EXPANDER_DEVICE:
 318		type = "smp";
 319		break;
 320	default:
 321		type = "unknown";
 322	}
 323
 324	/* this routine is polled by libata error recovery so filter
 325	 * unimportant messages
 326	 */
 327	if (new_phy || phy->attached_dev_type != dev_type ||
 328	    phy->linkrate != linkrate ||
 329	    SAS_ADDR(phy->attached_sas_addr) != SAS_ADDR(sas_addr))
 330		/* pass */;
 331	else
 332		return;
 333
 334	/* if the attached device type changed and ata_eh is active,
 335	 * make sure we run revalidation when eh completes (see:
 336	 * sas_enable_revalidation)
 337	 */
 338	if (test_bit(SAS_HA_ATA_EH_ACTIVE, &ha->state))
 339		set_bit(DISCE_REVALIDATE_DOMAIN, &dev->port->disc.pending);
 340
 341	pr_debug("%sex %016llx phy%02d:%c:%X attached: %016llx (%s)\n",
 342		 test_bit(SAS_HA_ATA_EH_ACTIVE, &ha->state) ? "ata: " : "",
 343		 SAS_ADDR(dev->sas_addr), phy->phy_id,
 344		 sas_route_char(dev, phy), phy->linkrate,
 345		 SAS_ADDR(phy->attached_sas_addr), type);
 346}
 347
 348/* check if we have an existing attached ata device on this expander phy */
 349struct domain_device *sas_ex_to_ata(struct domain_device *ex_dev, int phy_id)
 350{
 351	struct ex_phy *ex_phy = &ex_dev->ex_dev.ex_phy[phy_id];
 352	struct domain_device *dev;
 353	struct sas_rphy *rphy;
 354
 355	if (!ex_phy->port)
 356		return NULL;
 357
 358	rphy = ex_phy->port->rphy;
 359	if (!rphy)
 360		return NULL;
 361
 362	dev = sas_find_dev_by_rphy(rphy);
 363
 364	if (dev && dev_is_sata(dev))
 365		return dev;
 366
 367	return NULL;
 368}
 369
 370#define DISCOVER_REQ_SIZE  16
 371#define DISCOVER_RESP_SIZE sizeof(struct smp_disc_resp)
 372
 373static int sas_ex_phy_discover_helper(struct domain_device *dev, u8 *disc_req,
 374				      struct smp_disc_resp *disc_resp,
 375				      int single)
 376{
 377	struct discover_resp *dr = &disc_resp->disc;
 378	int res;
 379
 380	disc_req[9] = single;
 381
 382	res = smp_execute_task(dev, disc_req, DISCOVER_REQ_SIZE,
 383			       disc_resp, DISCOVER_RESP_SIZE);
 384	if (res)
 385		return res;
 386	if (memcmp(dev->sas_addr, dr->attached_sas_addr, SAS_ADDR_SIZE) == 0) {
 387		pr_notice("Found loopback topology, just ignore it!\n");
 388		return 0;
 389	}
 390	sas_set_ex_phy(dev, single, disc_resp);
 391	return 0;
 392}
 393
 394int sas_ex_phy_discover(struct domain_device *dev, int single)
 395{
 396	struct expander_device *ex = &dev->ex_dev;
 397	int  res = 0;
 398	u8   *disc_req;
 399	struct smp_disc_resp *disc_resp;
 400
 401	disc_req = alloc_smp_req(DISCOVER_REQ_SIZE);
 402	if (!disc_req)
 403		return -ENOMEM;
 404
 405	disc_resp = alloc_smp_resp(DISCOVER_RESP_SIZE);
 406	if (!disc_resp) {
 407		kfree(disc_req);
 408		return -ENOMEM;
 409	}
 410
 411	disc_req[1] = SMP_DISCOVER;
 412
 413	if (0 <= single && single < ex->num_phys) {
 414		res = sas_ex_phy_discover_helper(dev, disc_req, disc_resp, single);
 415	} else {
 416		int i;
 417
 418		for (i = 0; i < ex->num_phys; i++) {
 419			res = sas_ex_phy_discover_helper(dev, disc_req,
 420							 disc_resp, i);
 421			if (res)
 422				goto out_err;
 423		}
 424	}
 425out_err:
 426	kfree(disc_resp);
 427	kfree(disc_req);
 428	return res;
 429}
 430
 431static int sas_expander_discover(struct domain_device *dev)
 432{
 433	struct expander_device *ex = &dev->ex_dev;
 434	int res;
 435
 436	ex->ex_phy = kcalloc(ex->num_phys, sizeof(*ex->ex_phy), GFP_KERNEL);
 437	if (!ex->ex_phy)
 438		return -ENOMEM;
 439
 440	res = sas_ex_phy_discover(dev, -1);
 441	if (res)
 442		goto out_err;
 443
 444	return 0;
 445 out_err:
 446	kfree(ex->ex_phy);
 447	ex->ex_phy = NULL;
 448	return res;
 449}
 450
 451#define MAX_EXPANDER_PHYS 128
 452
 453#define RG_REQ_SIZE   8
 454#define RG_RESP_SIZE  sizeof(struct smp_rg_resp)
 455
 456static int sas_ex_general(struct domain_device *dev)
 457{
 458	u8 *rg_req;
 459	struct smp_rg_resp *rg_resp;
 460	struct report_general_resp *rg;
 461	int res;
 462	int i;
 463
 464	rg_req = alloc_smp_req(RG_REQ_SIZE);
 465	if (!rg_req)
 466		return -ENOMEM;
 467
 468	rg_resp = alloc_smp_resp(RG_RESP_SIZE);
 469	if (!rg_resp) {
 470		kfree(rg_req);
 471		return -ENOMEM;
 472	}
 473
 474	rg_req[1] = SMP_REPORT_GENERAL;
 475
 476	for (i = 0; i < 5; i++) {
 477		res = smp_execute_task(dev, rg_req, RG_REQ_SIZE, rg_resp,
 478				       RG_RESP_SIZE);
 479
 480		if (res) {
 481			pr_notice("RG to ex %016llx failed:0x%x\n",
 482				  SAS_ADDR(dev->sas_addr), res);
 483			goto out;
 484		} else if (rg_resp->result != SMP_RESP_FUNC_ACC) {
 485			pr_debug("RG:ex %016llx returned SMP result:0x%x\n",
 486				 SAS_ADDR(dev->sas_addr), rg_resp->result);
 487			res = rg_resp->result;
 488			goto out;
 489		}
 490
 491		rg = &rg_resp->rg;
 492		dev->ex_dev.ex_change_count = be16_to_cpu(rg->change_count);
 493		dev->ex_dev.max_route_indexes = be16_to_cpu(rg->route_indexes);
 494		dev->ex_dev.num_phys = min(rg->num_phys, (u8)MAX_EXPANDER_PHYS);
 495		dev->ex_dev.t2t_supp = rg->t2t_supp;
 496		dev->ex_dev.conf_route_table = rg->conf_route_table;
 497		dev->ex_dev.configuring = rg->configuring;
 498		memcpy(dev->ex_dev.enclosure_logical_id,
 499		       rg->enclosure_logical_id, 8);
 500
 501		if (dev->ex_dev.configuring) {
 502			pr_debug("RG: ex %016llx self-configuring...\n",
 503				 SAS_ADDR(dev->sas_addr));
 504			schedule_timeout_interruptible(5*HZ);
 505		} else
 506			break;
 507	}
 508out:
 509	kfree(rg_req);
 510	kfree(rg_resp);
 511	return res;
 512}
 513
 514static void ex_assign_manuf_info(struct domain_device *dev, void
 515					*_mi_resp)
 516{
 517	u8 *mi_resp = _mi_resp;
 518	struct sas_rphy *rphy = dev->rphy;
 519	struct sas_expander_device *edev = rphy_to_expander_device(rphy);
 520
 521	memcpy(edev->vendor_id, mi_resp + 12, SAS_EXPANDER_VENDOR_ID_LEN);
 522	memcpy(edev->product_id, mi_resp + 20, SAS_EXPANDER_PRODUCT_ID_LEN);
 523	memcpy(edev->product_rev, mi_resp + 36,
 524	       SAS_EXPANDER_PRODUCT_REV_LEN);
 525
 526	if (mi_resp[8] & 1) {
 527		memcpy(edev->component_vendor_id, mi_resp + 40,
 528		       SAS_EXPANDER_COMPONENT_VENDOR_ID_LEN);
 529		edev->component_id = mi_resp[48] << 8 | mi_resp[49];
 530		edev->component_revision_id = mi_resp[50];
 531	}
 532}
 533
 534#define MI_REQ_SIZE   8
 535#define MI_RESP_SIZE 64
 536
 537static int sas_ex_manuf_info(struct domain_device *dev)
 538{
 539	u8 *mi_req;
 540	u8 *mi_resp;
 541	int res;
 542
 543	mi_req = alloc_smp_req(MI_REQ_SIZE);
 544	if (!mi_req)
 545		return -ENOMEM;
 546
 547	mi_resp = alloc_smp_resp(MI_RESP_SIZE);
 548	if (!mi_resp) {
 549		kfree(mi_req);
 550		return -ENOMEM;
 551	}
 552
 553	mi_req[1] = SMP_REPORT_MANUF_INFO;
 554
 555	res = smp_execute_task(dev, mi_req, MI_REQ_SIZE, mi_resp, MI_RESP_SIZE);
 556	if (res) {
 557		pr_notice("MI: ex %016llx failed:0x%x\n",
 558			  SAS_ADDR(dev->sas_addr), res);
 559		goto out;
 560	} else if (mi_resp[2] != SMP_RESP_FUNC_ACC) {
 561		pr_debug("MI ex %016llx returned SMP result:0x%x\n",
 562			 SAS_ADDR(dev->sas_addr), mi_resp[2]);
 563		goto out;
 564	}
 565
 566	ex_assign_manuf_info(dev, mi_resp);
 567out:
 568	kfree(mi_req);
 569	kfree(mi_resp);
 570	return res;
 571}
 572
 573#define PC_REQ_SIZE  44
 574#define PC_RESP_SIZE 8
 575
 576int sas_smp_phy_control(struct domain_device *dev, int phy_id,
 577			enum phy_func phy_func,
 578			struct sas_phy_linkrates *rates)
 579{
 580	u8 *pc_req;
 581	u8 *pc_resp;
 582	int res;
 583
 584	pc_req = alloc_smp_req(PC_REQ_SIZE);
 585	if (!pc_req)
 586		return -ENOMEM;
 587
 588	pc_resp = alloc_smp_resp(PC_RESP_SIZE);
 589	if (!pc_resp) {
 590		kfree(pc_req);
 591		return -ENOMEM;
 592	}
 593
 594	pc_req[1] = SMP_PHY_CONTROL;
 595	pc_req[9] = phy_id;
 596	pc_req[10] = phy_func;
 597	if (rates) {
 598		pc_req[32] = rates->minimum_linkrate << 4;
 599		pc_req[33] = rates->maximum_linkrate << 4;
 600	}
 601
 602	res = smp_execute_task(dev, pc_req, PC_REQ_SIZE, pc_resp, PC_RESP_SIZE);
 603	if (res) {
 604		pr_err("ex %016llx phy%02d PHY control failed: %d\n",
 605		       SAS_ADDR(dev->sas_addr), phy_id, res);
 606	} else if (pc_resp[2] != SMP_RESP_FUNC_ACC) {
 607		pr_err("ex %016llx phy%02d PHY control failed: function result 0x%x\n",
 608		       SAS_ADDR(dev->sas_addr), phy_id, pc_resp[2]);
 609		res = pc_resp[2];
 610	}
 611	kfree(pc_resp);
 612	kfree(pc_req);
 613	return res;
 614}
 615
 616static void sas_ex_disable_phy(struct domain_device *dev, int phy_id)
 617{
 618	struct expander_device *ex = &dev->ex_dev;
 619	struct ex_phy *phy = &ex->ex_phy[phy_id];
 620
 621	sas_smp_phy_control(dev, phy_id, PHY_FUNC_DISABLE, NULL);
 622	phy->linkrate = SAS_PHY_DISABLED;
 623}
 624
 625static void sas_ex_disable_port(struct domain_device *dev, u8 *sas_addr)
 626{
 627	struct expander_device *ex = &dev->ex_dev;
 628	int i;
 629
 630	for (i = 0; i < ex->num_phys; i++) {
 631		struct ex_phy *phy = &ex->ex_phy[i];
 632
 633		if (phy->phy_state == PHY_VACANT ||
 634		    phy->phy_state == PHY_NOT_PRESENT)
 635			continue;
 636
 637		if (SAS_ADDR(phy->attached_sas_addr) == SAS_ADDR(sas_addr))
 638			sas_ex_disable_phy(dev, i);
 639	}
 640}
 641
 642static int sas_dev_present_in_domain(struct asd_sas_port *port,
 643					    u8 *sas_addr)
 644{
 645	struct domain_device *dev;
 646
 647	if (SAS_ADDR(port->sas_addr) == SAS_ADDR(sas_addr))
 648		return 1;
 649	list_for_each_entry(dev, &port->dev_list, dev_list_node) {
 650		if (SAS_ADDR(dev->sas_addr) == SAS_ADDR(sas_addr))
 651			return 1;
 652	}
 653	return 0;
 654}
 655
 656#define RPEL_REQ_SIZE	16
 657#define RPEL_RESP_SIZE	32
 658int sas_smp_get_phy_events(struct sas_phy *phy)
 659{
 660	int res;
 661	u8 *req;
 662	u8 *resp;
 663	struct sas_rphy *rphy = dev_to_rphy(phy->dev.parent);
 664	struct domain_device *dev = sas_find_dev_by_rphy(rphy);
 665
 666	req = alloc_smp_req(RPEL_REQ_SIZE);
 667	if (!req)
 668		return -ENOMEM;
 669
 670	resp = alloc_smp_resp(RPEL_RESP_SIZE);
 671	if (!resp) {
 672		kfree(req);
 673		return -ENOMEM;
 674	}
 675
 676	req[1] = SMP_REPORT_PHY_ERR_LOG;
 677	req[9] = phy->number;
 678
 679	res = smp_execute_task(dev, req, RPEL_REQ_SIZE,
 680			       resp, RPEL_RESP_SIZE);
 681
 682	if (res)
 683		goto out;
 684
 685	phy->invalid_dword_count = get_unaligned_be32(&resp[12]);
 686	phy->running_disparity_error_count = get_unaligned_be32(&resp[16]);
 687	phy->loss_of_dword_sync_count = get_unaligned_be32(&resp[20]);
 688	phy->phy_reset_problem_count = get_unaligned_be32(&resp[24]);
 689
 690 out:
 691	kfree(req);
 692	kfree(resp);
 693	return res;
 694
 695}
 696
 697#ifdef CONFIG_SCSI_SAS_ATA
 698
 699#define RPS_REQ_SIZE  16
 700#define RPS_RESP_SIZE sizeof(struct smp_rps_resp)
 701
 702int sas_get_report_phy_sata(struct domain_device *dev, int phy_id,
 703			    struct smp_rps_resp *rps_resp)
 704{
 705	int res;
 706	u8 *rps_req = alloc_smp_req(RPS_REQ_SIZE);
 707	u8 *resp = (u8 *)rps_resp;
 708
 709	if (!rps_req)
 710		return -ENOMEM;
 711
 712	rps_req[1] = SMP_REPORT_PHY_SATA;
 713	rps_req[9] = phy_id;
 714
 715	res = smp_execute_task(dev, rps_req, RPS_REQ_SIZE,
 716			       rps_resp, RPS_RESP_SIZE);
 717
 718	/* 0x34 is the FIS type for the D2H fis.  There's a potential
 719	 * standards cockup here.  sas-2 explicitly specifies the FIS
 720	 * should be encoded so that FIS type is in resp[24].
 721	 * However, some expanders endian reverse this.  Undo the
 722	 * reversal here */
 723	if (!res && resp[27] == 0x34 && resp[24] != 0x34) {
 724		int i;
 725
 726		for (i = 0; i < 5; i++) {
 727			int j = 24 + (i*4);
 728			u8 a, b;
 729			a = resp[j + 0];
 730			b = resp[j + 1];
 731			resp[j + 0] = resp[j + 3];
 732			resp[j + 1] = resp[j + 2];
 733			resp[j + 2] = b;
 734			resp[j + 3] = a;
 735		}
 736	}
 737
 738	kfree(rps_req);
 739	return res;
 740}
 741#endif
 742
 743static void sas_ex_get_linkrate(struct domain_device *parent,
 744				       struct domain_device *child,
 745				       struct ex_phy *parent_phy)
 746{
 747	struct expander_device *parent_ex = &parent->ex_dev;
 748	struct sas_port *port;
 749	int i;
 750
 751	child->pathways = 0;
 752
 753	port = parent_phy->port;
 754
 755	for (i = 0; i < parent_ex->num_phys; i++) {
 756		struct ex_phy *phy = &parent_ex->ex_phy[i];
 757
 758		if (phy->phy_state == PHY_VACANT ||
 759		    phy->phy_state == PHY_NOT_PRESENT)
 760			continue;
 761
 762		if (sas_phy_match_dev_addr(child, phy)) {
 763			child->min_linkrate = min(parent->min_linkrate,
 764						  phy->linkrate);
 765			child->max_linkrate = max(parent->max_linkrate,
 766						  phy->linkrate);
 767			child->pathways++;
 768			sas_port_add_phy(port, phy->phy);
 769		}
 770	}
 771	child->linkrate = min(parent_phy->linkrate, child->max_linkrate);
 772	child->pathways = min(child->pathways, parent->pathways);
 773}
 774
 775static int sas_ex_add_dev(struct domain_device *parent, struct ex_phy *phy,
 776			  struct domain_device *child, int phy_id)
 777{
 778	struct sas_rphy *rphy;
 779	int res;
 780
 781	child->dev_type = SAS_END_DEVICE;
 782	rphy = sas_end_device_alloc(phy->port);
 783	if (!rphy)
 784		return -ENOMEM;
 785
 786	child->tproto = phy->attached_tproto;
 787	sas_init_dev(child);
 788
 789	child->rphy = rphy;
 790	get_device(&rphy->dev);
 791	rphy->identify.phy_identifier = phy_id;
 792	sas_fill_in_rphy(child, rphy);
 793
 794	list_add_tail(&child->disco_list_node, &parent->port->disco_list);
 795
 796	res = sas_notify_lldd_dev_found(child);
 797	if (res) {
 798		pr_notice("notify lldd for device %016llx at %016llx:%02d returned 0x%x\n",
 799			  SAS_ADDR(child->sas_addr),
 800			  SAS_ADDR(parent->sas_addr), phy_id, res);
 801		sas_rphy_free(child->rphy);
 802		list_del(&child->disco_list_node);
 803		return res;
 804	}
 805
 806	return 0;
 807}
 808
 809static struct domain_device *sas_ex_discover_end_dev(
 810	struct domain_device *parent, int phy_id)
 811{
 812	struct expander_device *parent_ex = &parent->ex_dev;
 813	struct ex_phy *phy = &parent_ex->ex_phy[phy_id];
 814	struct domain_device *child = NULL;
 815	int res;
 816
 817	if (phy->attached_sata_host || phy->attached_sata_ps)
 818		return NULL;
 819
 820	child = sas_alloc_device();
 821	if (!child)
 822		return NULL;
 823
 824	kref_get(&parent->kref);
 825	child->parent = parent;
 826	child->port   = parent->port;
 827	child->iproto = phy->attached_iproto;
 828	memcpy(child->sas_addr, phy->attached_sas_addr, SAS_ADDR_SIZE);
 829	sas_hash_addr(child->hashed_sas_addr, child->sas_addr);
 830	if (!phy->port) {
 831		phy->port = sas_port_alloc(&parent->rphy->dev, phy_id);
 832		if (unlikely(!phy->port))
 833			goto out_err;
 834		if (unlikely(sas_port_add(phy->port) != 0)) {
 835			sas_port_free(phy->port);
 836			goto out_err;
 837		}
 838	}
 839	sas_ex_get_linkrate(parent, child, phy);
 840	sas_device_set_phy(child, phy->port);
 841
 842	if ((phy->attached_tproto & SAS_PROTOCOL_STP) || phy->attached_sata_dev) {
 843		res = sas_ata_add_dev(parent, phy, child, phy_id);
 844	} else if (phy->attached_tproto & SAS_PROTOCOL_SSP) {
 845		res = sas_ex_add_dev(parent, phy, child, phy_id);
 846	} else {
 847		pr_notice("target proto 0x%x at %016llx:0x%x not handled\n",
 848			  phy->attached_tproto, SAS_ADDR(parent->sas_addr),
 849			  phy_id);
 850		res = -ENODEV;
 851	}
 852
 853	if (res)
 854		goto out_free;
 855
 856	list_add_tail(&child->siblings, &parent_ex->children);
 857	return child;
 858
 859 out_free:
 860	sas_port_delete(phy->port);
 861 out_err:
 862	phy->port = NULL;
 863	sas_put_device(child);
 864	return NULL;
 865}
 866
 867/* See if this phy is part of a wide port */
 868static bool sas_ex_join_wide_port(struct domain_device *parent, int phy_id)
 869{
 870	struct ex_phy *phy = &parent->ex_dev.ex_phy[phy_id];
 871	int i;
 872
 873	for (i = 0; i < parent->ex_dev.num_phys; i++) {
 874		struct ex_phy *ephy = &parent->ex_dev.ex_phy[i];
 875
 876		if (ephy == phy)
 877			continue;
 878
 879		if (!memcmp(phy->attached_sas_addr, ephy->attached_sas_addr,
 880			    SAS_ADDR_SIZE) && ephy->port) {
 881			sas_port_add_ex_phy(ephy->port, phy);
 882			return true;
 883		}
 884	}
 885
 886	return false;
 887}
 888
 889static struct domain_device *sas_ex_discover_expander(
 890	struct domain_device *parent, int phy_id)
 891{
 892	struct sas_expander_device *parent_ex = rphy_to_expander_device(parent->rphy);
 893	struct ex_phy *phy = &parent->ex_dev.ex_phy[phy_id];
 894	struct domain_device *child = NULL;
 895	struct sas_rphy *rphy;
 896	struct sas_expander_device *edev;
 897	struct asd_sas_port *port;
 898	int res;
 899
 900	if (phy->routing_attr == DIRECT_ROUTING) {
 901		pr_warn("ex %016llx:%02d:D <--> ex %016llx:0x%x is not allowed\n",
 902			SAS_ADDR(parent->sas_addr), phy_id,
 903			SAS_ADDR(phy->attached_sas_addr),
 904			phy->attached_phy_id);
 905		return NULL;
 906	}
 907	child = sas_alloc_device();
 908	if (!child)
 909		return NULL;
 910
 911	phy->port = sas_port_alloc(&parent->rphy->dev, phy_id);
 912	/* FIXME: better error handling */
 913	BUG_ON(sas_port_add(phy->port) != 0);
 914
 915
 916	switch (phy->attached_dev_type) {
 917	case SAS_EDGE_EXPANDER_DEVICE:
 918		rphy = sas_expander_alloc(phy->port,
 919					  SAS_EDGE_EXPANDER_DEVICE);
 920		break;
 921	case SAS_FANOUT_EXPANDER_DEVICE:
 922		rphy = sas_expander_alloc(phy->port,
 923					  SAS_FANOUT_EXPANDER_DEVICE);
 924		break;
 925	default:
 926		rphy = NULL;	/* shut gcc up */
 927		BUG();
 928	}
 929	port = parent->port;
 930	child->rphy = rphy;
 931	get_device(&rphy->dev);
 932	edev = rphy_to_expander_device(rphy);
 933	child->dev_type = phy->attached_dev_type;
 934	kref_get(&parent->kref);
 935	child->parent = parent;
 936	child->port = port;
 937	child->iproto = phy->attached_iproto;
 938	child->tproto = phy->attached_tproto;
 939	memcpy(child->sas_addr, phy->attached_sas_addr, SAS_ADDR_SIZE);
 940	sas_hash_addr(child->hashed_sas_addr, child->sas_addr);
 941	sas_ex_get_linkrate(parent, child, phy);
 942	edev->level = parent_ex->level + 1;
 943	parent->port->disc.max_level = max(parent->port->disc.max_level,
 944					   edev->level);
 945	sas_init_dev(child);
 946	sas_fill_in_rphy(child, rphy);
 947	sas_rphy_add(rphy);
 948
 949	spin_lock_irq(&parent->port->dev_list_lock);
 950	list_add_tail(&child->dev_list_node, &parent->port->dev_list);
 951	spin_unlock_irq(&parent->port->dev_list_lock);
 952
 953	res = sas_discover_expander(child);
 954	if (res) {
 955		sas_rphy_delete(rphy);
 956		spin_lock_irq(&parent->port->dev_list_lock);
 957		list_del(&child->dev_list_node);
 958		spin_unlock_irq(&parent->port->dev_list_lock);
 959		sas_put_device(child);
 960		sas_port_delete(phy->port);
 961		phy->port = NULL;
 962		return NULL;
 963	}
 964	list_add_tail(&child->siblings, &parent->ex_dev.children);
 965	return child;
 966}
 967
 968static int sas_ex_discover_dev(struct domain_device *dev, int phy_id)
 969{
 970	struct expander_device *ex = &dev->ex_dev;
 971	struct ex_phy *ex_phy = &ex->ex_phy[phy_id];
 972	struct domain_device *child = NULL;
 973	int res = 0;
 974
 975	/* Phy state */
 976	if (ex_phy->linkrate == SAS_SATA_SPINUP_HOLD) {
 977		if (!sas_smp_phy_control(dev, phy_id, PHY_FUNC_LINK_RESET, NULL))
 978			res = sas_ex_phy_discover(dev, phy_id);
 979		if (res)
 980			return res;
 981	}
 982
 983	/* Parent and domain coherency */
 984	if (!dev->parent && sas_phy_match_port_addr(dev->port, ex_phy)) {
 985		sas_ex_add_parent_port(dev, phy_id);
 986		return 0;
 987	}
 988	if (dev->parent && sas_phy_match_dev_addr(dev->parent, ex_phy)) {
 989		sas_ex_add_parent_port(dev, phy_id);
 990		if (ex_phy->routing_attr == TABLE_ROUTING)
 991			sas_configure_phy(dev, phy_id, dev->port->sas_addr, 1);
 992		return 0;
 993	}
 994
 995	if (sas_dev_present_in_domain(dev->port, ex_phy->attached_sas_addr))
 996		sas_ex_disable_port(dev, ex_phy->attached_sas_addr);
 997
 998	if (ex_phy->attached_dev_type == SAS_PHY_UNUSED) {
 999		if (ex_phy->routing_attr == DIRECT_ROUTING) {
1000			memset(ex_phy->attached_sas_addr, 0, SAS_ADDR_SIZE);
1001			sas_configure_routing(dev, ex_phy->attached_sas_addr);
1002		}
1003		return 0;
1004	} else if (ex_phy->linkrate == SAS_LINK_RATE_UNKNOWN)
1005		return 0;
1006
1007	if (ex_phy->attached_dev_type != SAS_END_DEVICE &&
1008	    ex_phy->attached_dev_type != SAS_FANOUT_EXPANDER_DEVICE &&
1009	    ex_phy->attached_dev_type != SAS_EDGE_EXPANDER_DEVICE &&
1010	    ex_phy->attached_dev_type != SAS_SATA_PENDING) {
1011		pr_warn("unknown device type(0x%x) attached to ex %016llx phy%02d\n",
1012			ex_phy->attached_dev_type,
1013			SAS_ADDR(dev->sas_addr),
1014			phy_id);
1015		return 0;
1016	}
1017
1018	res = sas_configure_routing(dev, ex_phy->attached_sas_addr);
1019	if (res) {
1020		pr_notice("configure routing for dev %016llx reported 0x%x. Forgotten\n",
1021			  SAS_ADDR(ex_phy->attached_sas_addr), res);
1022		sas_disable_routing(dev, ex_phy->attached_sas_addr);
1023		return res;
1024	}
1025
1026	if (sas_ex_join_wide_port(dev, phy_id)) {
1027		pr_debug("Attaching ex phy%02d to wide port %016llx\n",
1028			 phy_id, SAS_ADDR(ex_phy->attached_sas_addr));
1029		return res;
1030	}
1031
1032	switch (ex_phy->attached_dev_type) {
1033	case SAS_END_DEVICE:
1034	case SAS_SATA_PENDING:
1035		child = sas_ex_discover_end_dev(dev, phy_id);
1036		break;
1037	case SAS_FANOUT_EXPANDER_DEVICE:
1038		if (SAS_ADDR(dev->port->disc.fanout_sas_addr)) {
1039			pr_debug("second fanout expander %016llx phy%02d attached to ex %016llx phy%02d\n",
1040				 SAS_ADDR(ex_phy->attached_sas_addr),
1041				 ex_phy->attached_phy_id,
1042				 SAS_ADDR(dev->sas_addr),
1043				 phy_id);
1044			sas_ex_disable_phy(dev, phy_id);
1045			return res;
1046		} else
1047			memcpy(dev->port->disc.fanout_sas_addr,
1048			       ex_phy->attached_sas_addr, SAS_ADDR_SIZE);
1049		fallthrough;
1050	case SAS_EDGE_EXPANDER_DEVICE:
1051		child = sas_ex_discover_expander(dev, phy_id);
1052		break;
1053	default:
1054		break;
1055	}
1056
1057	if (!child)
1058		pr_notice("ex %016llx phy%02d failed to discover\n",
1059			  SAS_ADDR(dev->sas_addr), phy_id);
1060	return res;
1061}
1062
1063static int sas_find_sub_addr(struct domain_device *dev, u8 *sub_addr)
1064{
1065	struct expander_device *ex = &dev->ex_dev;
1066	int i;
1067
1068	for (i = 0; i < ex->num_phys; i++) {
1069		struct ex_phy *phy = &ex->ex_phy[i];
1070
1071		if (phy->phy_state == PHY_VACANT ||
1072		    phy->phy_state == PHY_NOT_PRESENT)
1073			continue;
1074
1075		if (dev_is_expander(phy->attached_dev_type) &&
1076		    phy->routing_attr == SUBTRACTIVE_ROUTING) {
1077
1078			memcpy(sub_addr, phy->attached_sas_addr, SAS_ADDR_SIZE);
1079
1080			return 1;
1081		}
1082	}
1083	return 0;
1084}
1085
1086static int sas_check_level_subtractive_boundary(struct domain_device *dev)
1087{
1088	struct expander_device *ex = &dev->ex_dev;
1089	struct domain_device *child;
1090	u8 sub_addr[SAS_ADDR_SIZE] = {0, };
1091
1092	list_for_each_entry(child, &ex->children, siblings) {
1093		if (!dev_is_expander(child->dev_type))
1094			continue;
1095		if (sub_addr[0] == 0) {
1096			sas_find_sub_addr(child, sub_addr);
1097			continue;
1098		} else {
1099			u8 s2[SAS_ADDR_SIZE];
1100
1101			if (sas_find_sub_addr(child, s2) &&
1102			    (SAS_ADDR(sub_addr) != SAS_ADDR(s2))) {
1103
1104				pr_notice("ex %016llx->%016llx-?->%016llx diverges from subtractive boundary %016llx\n",
1105					  SAS_ADDR(dev->sas_addr),
1106					  SAS_ADDR(child->sas_addr),
1107					  SAS_ADDR(s2),
1108					  SAS_ADDR(sub_addr));
1109
1110				sas_ex_disable_port(child, s2);
1111			}
1112		}
1113	}
1114	return 0;
1115}
1116/**
1117 * sas_ex_discover_devices - discover devices attached to this expander
1118 * @dev: pointer to the expander domain device
1119 * @single: if you want to do a single phy, else set to -1;
1120 *
1121 * Configure this expander for use with its devices and register the
1122 * devices of this expander.
1123 */
1124static int sas_ex_discover_devices(struct domain_device *dev, int single)
1125{
1126	struct expander_device *ex = &dev->ex_dev;
1127	int i = 0, end = ex->num_phys;
1128	int res = 0;
1129
1130	if (0 <= single && single < end) {
1131		i = single;
1132		end = i+1;
1133	}
1134
1135	for ( ; i < end; i++) {
1136		struct ex_phy *ex_phy = &ex->ex_phy[i];
1137
1138		if (ex_phy->phy_state == PHY_VACANT ||
1139		    ex_phy->phy_state == PHY_NOT_PRESENT ||
1140		    ex_phy->phy_state == PHY_DEVICE_DISCOVERED)
1141			continue;
1142
1143		switch (ex_phy->linkrate) {
1144		case SAS_PHY_DISABLED:
1145		case SAS_PHY_RESET_PROBLEM:
1146		case SAS_SATA_PORT_SELECTOR:
1147			continue;
1148		default:
1149			res = sas_ex_discover_dev(dev, i);
1150			if (res)
1151				break;
1152			continue;
1153		}
1154	}
1155
1156	if (!res)
1157		sas_check_level_subtractive_boundary(dev);
1158
1159	return res;
1160}
1161
1162static int sas_check_ex_subtractive_boundary(struct domain_device *dev)
1163{
1164	struct expander_device *ex = &dev->ex_dev;
1165	int i;
1166	u8  *sub_sas_addr = NULL;
1167
1168	if (dev->dev_type != SAS_EDGE_EXPANDER_DEVICE)
1169		return 0;
1170
1171	for (i = 0; i < ex->num_phys; i++) {
1172		struct ex_phy *phy = &ex->ex_phy[i];
1173
1174		if (phy->phy_state == PHY_VACANT ||
1175		    phy->phy_state == PHY_NOT_PRESENT)
1176			continue;
1177
1178		if (dev_is_expander(phy->attached_dev_type) &&
1179		    phy->routing_attr == SUBTRACTIVE_ROUTING) {
1180
1181			if (!sub_sas_addr)
1182				sub_sas_addr = &phy->attached_sas_addr[0];
1183			else if (SAS_ADDR(sub_sas_addr) !=
1184				 SAS_ADDR(phy->attached_sas_addr)) {
1185
1186				pr_notice("ex %016llx phy%02d diverges(%016llx) on subtractive boundary(%016llx). Disabled\n",
1187					  SAS_ADDR(dev->sas_addr), i,
1188					  SAS_ADDR(phy->attached_sas_addr),
1189					  SAS_ADDR(sub_sas_addr));
1190				sas_ex_disable_phy(dev, i);
1191			}
1192		}
1193	}
1194	return 0;
1195}
1196
1197static void sas_print_parent_topology_bug(struct domain_device *child,
1198						 struct ex_phy *parent_phy,
1199						 struct ex_phy *child_phy)
1200{
1201	static const char *ex_type[] = {
1202		[SAS_EDGE_EXPANDER_DEVICE] = "edge",
1203		[SAS_FANOUT_EXPANDER_DEVICE] = "fanout",
1204	};
1205	struct domain_device *parent = child->parent;
1206
1207	pr_notice("%s ex %016llx phy%02d <--> %s ex %016llx phy%02d has %c:%c routing link!\n",
1208		  ex_type[parent->dev_type],
1209		  SAS_ADDR(parent->sas_addr),
1210		  parent_phy->phy_id,
1211
1212		  ex_type[child->dev_type],
1213		  SAS_ADDR(child->sas_addr),
1214		  child_phy->phy_id,
1215
1216		  sas_route_char(parent, parent_phy),
1217		  sas_route_char(child, child_phy));
1218}
1219
1220static bool sas_eeds_valid(struct domain_device *parent,
1221			   struct domain_device *child)
1222{
1223	struct sas_discovery *disc = &parent->port->disc;
1224
1225	return (SAS_ADDR(disc->eeds_a) == SAS_ADDR(parent->sas_addr) ||
1226		SAS_ADDR(disc->eeds_a) == SAS_ADDR(child->sas_addr)) &&
1227	       (SAS_ADDR(disc->eeds_b) == SAS_ADDR(parent->sas_addr) ||
1228		SAS_ADDR(disc->eeds_b) == SAS_ADDR(child->sas_addr));
1229}
1230
1231static int sas_check_eeds(struct domain_device *child,
1232			  struct ex_phy *parent_phy,
1233			  struct ex_phy *child_phy)
1234{
1235	int res = 0;
1236	struct domain_device *parent = child->parent;
1237	struct sas_discovery *disc = &parent->port->disc;
1238
1239	if (SAS_ADDR(disc->fanout_sas_addr) != 0) {
1240		res = -ENODEV;
1241		pr_warn("edge ex %016llx phy S:%02d <--> edge ex %016llx phy S:%02d, while there is a fanout ex %016llx\n",
1242			SAS_ADDR(parent->sas_addr),
1243			parent_phy->phy_id,
1244			SAS_ADDR(child->sas_addr),
1245			child_phy->phy_id,
1246			SAS_ADDR(disc->fanout_sas_addr));
1247	} else if (SAS_ADDR(disc->eeds_a) == 0) {
1248		memcpy(disc->eeds_a, parent->sas_addr, SAS_ADDR_SIZE);
1249		memcpy(disc->eeds_b, child->sas_addr, SAS_ADDR_SIZE);
1250	} else if (!sas_eeds_valid(parent, child)) {
1251		res = -ENODEV;
1252		pr_warn("edge ex %016llx phy%02d <--> edge ex %016llx phy%02d link forms a third EEDS!\n",
1253			SAS_ADDR(parent->sas_addr),
1254			parent_phy->phy_id,
1255			SAS_ADDR(child->sas_addr),
1256			child_phy->phy_id);
1257	}
1258
1259	return res;
1260}
1261
1262static int sas_check_edge_expander_topo(struct domain_device *child,
1263					struct ex_phy *parent_phy)
1264{
1265	struct expander_device *child_ex = &child->ex_dev;
1266	struct expander_device *parent_ex = &child->parent->ex_dev;
1267	struct ex_phy *child_phy;
1268
1269	child_phy = &child_ex->ex_phy[parent_phy->attached_phy_id];
1270
1271	if (child->dev_type == SAS_FANOUT_EXPANDER_DEVICE) {
1272		if (parent_phy->routing_attr != SUBTRACTIVE_ROUTING ||
1273		    child_phy->routing_attr != TABLE_ROUTING)
1274			goto error;
1275	} else if (parent_phy->routing_attr == SUBTRACTIVE_ROUTING) {
1276		if (child_phy->routing_attr == SUBTRACTIVE_ROUTING)
1277			return sas_check_eeds(child, parent_phy, child_phy);
1278		else if (child_phy->routing_attr != TABLE_ROUTING)
1279			goto error;
1280	} else if (parent_phy->routing_attr == TABLE_ROUTING) {
1281		if (child_phy->routing_attr != SUBTRACTIVE_ROUTING &&
1282		    (child_phy->routing_attr != TABLE_ROUTING ||
1283		     !child_ex->t2t_supp || !parent_ex->t2t_supp))
1284			goto error;
1285	}
1286
1287	return 0;
1288error:
1289	sas_print_parent_topology_bug(child, parent_phy, child_phy);
1290	return -ENODEV;
1291}
1292
1293static int sas_check_fanout_expander_topo(struct domain_device *child,
1294					  struct ex_phy *parent_phy)
1295{
1296	struct expander_device *child_ex = &child->ex_dev;
1297	struct ex_phy *child_phy;
1298
1299	child_phy = &child_ex->ex_phy[parent_phy->attached_phy_id];
1300
1301	if (parent_phy->routing_attr == TABLE_ROUTING &&
1302	    child_phy->routing_attr == SUBTRACTIVE_ROUTING)
1303		return 0;
1304
1305	sas_print_parent_topology_bug(child, parent_phy, child_phy);
1306
1307	return -ENODEV;
1308}
1309
1310static int sas_check_parent_topology(struct domain_device *child)
1311{
1312	struct expander_device *parent_ex;
1313	int i;
1314	int res = 0;
1315
1316	if (!dev_parent_is_expander(child))
1317		return 0;
1318
1319	parent_ex = &child->parent->ex_dev;
1320
1321	for (i = 0; i < parent_ex->num_phys; i++) {
1322		struct ex_phy *parent_phy = &parent_ex->ex_phy[i];
1323
1324		if (parent_phy->phy_state == PHY_VACANT ||
1325		    parent_phy->phy_state == PHY_NOT_PRESENT)
1326			continue;
1327
1328		if (!sas_phy_match_dev_addr(child, parent_phy))
1329			continue;
1330
1331		switch (child->parent->dev_type) {
1332		case SAS_EDGE_EXPANDER_DEVICE:
1333			if (sas_check_edge_expander_topo(child, parent_phy))
1334				res = -ENODEV;
1335			break;
1336		case SAS_FANOUT_EXPANDER_DEVICE:
1337			if (sas_check_fanout_expander_topo(child, parent_phy))
1338				res = -ENODEV;
1339			break;
1340		default:
1341			break;
1342		}
1343	}
1344
1345	return res;
1346}
1347
1348#define RRI_REQ_SIZE  16
1349#define RRI_RESP_SIZE 44
1350
1351static int sas_configure_present(struct domain_device *dev, int phy_id,
1352				 u8 *sas_addr, int *index, int *present)
1353{
1354	int i, res = 0;
1355	struct expander_device *ex = &dev->ex_dev;
1356	struct ex_phy *phy = &ex->ex_phy[phy_id];
1357	u8 *rri_req;
1358	u8 *rri_resp;
1359
1360	*present = 0;
1361	*index = 0;
1362
1363	rri_req = alloc_smp_req(RRI_REQ_SIZE);
1364	if (!rri_req)
1365		return -ENOMEM;
1366
1367	rri_resp = alloc_smp_resp(RRI_RESP_SIZE);
1368	if (!rri_resp) {
1369		kfree(rri_req);
1370		return -ENOMEM;
1371	}
1372
1373	rri_req[1] = SMP_REPORT_ROUTE_INFO;
1374	rri_req[9] = phy_id;
1375
1376	for (i = 0; i < ex->max_route_indexes ; i++) {
1377		*(__be16 *)(rri_req+6) = cpu_to_be16(i);
1378		res = smp_execute_task(dev, rri_req, RRI_REQ_SIZE, rri_resp,
1379				       RRI_RESP_SIZE);
1380		if (res)
1381			goto out;
1382		res = rri_resp[2];
1383		if (res == SMP_RESP_NO_INDEX) {
1384			pr_warn("overflow of indexes: dev %016llx phy%02d index 0x%x\n",
1385				SAS_ADDR(dev->sas_addr), phy_id, i);
1386			goto out;
1387		} else if (res != SMP_RESP_FUNC_ACC) {
1388			pr_notice("%s: dev %016llx phy%02d index 0x%x result 0x%x\n",
1389				  __func__, SAS_ADDR(dev->sas_addr), phy_id,
1390				  i, res);
1391			goto out;
1392		}
1393		if (SAS_ADDR(sas_addr) != 0) {
1394			if (SAS_ADDR(rri_resp+16) == SAS_ADDR(sas_addr)) {
1395				*index = i;
1396				if ((rri_resp[12] & 0x80) == 0x80)
1397					*present = 0;
1398				else
1399					*present = 1;
1400				goto out;
1401			} else if (SAS_ADDR(rri_resp+16) == 0) {
1402				*index = i;
1403				*present = 0;
1404				goto out;
1405			}
1406		} else if (SAS_ADDR(rri_resp+16) == 0 &&
1407			   phy->last_da_index < i) {
1408			phy->last_da_index = i;
1409			*index = i;
1410			*present = 0;
1411			goto out;
1412		}
1413	}
1414	res = -1;
1415out:
1416	kfree(rri_req);
1417	kfree(rri_resp);
1418	return res;
1419}
1420
1421#define CRI_REQ_SIZE  44
1422#define CRI_RESP_SIZE  8
1423
1424static int sas_configure_set(struct domain_device *dev, int phy_id,
1425			     u8 *sas_addr, int index, int include)
1426{
1427	int res;
1428	u8 *cri_req;
1429	u8 *cri_resp;
1430
1431	cri_req = alloc_smp_req(CRI_REQ_SIZE);
1432	if (!cri_req)
1433		return -ENOMEM;
1434
1435	cri_resp = alloc_smp_resp(CRI_RESP_SIZE);
1436	if (!cri_resp) {
1437		kfree(cri_req);
1438		return -ENOMEM;
1439	}
1440
1441	cri_req[1] = SMP_CONF_ROUTE_INFO;
1442	*(__be16 *)(cri_req+6) = cpu_to_be16(index);
1443	cri_req[9] = phy_id;
1444	if (SAS_ADDR(sas_addr) == 0 || !include)
1445		cri_req[12] |= 0x80;
1446	memcpy(cri_req+16, sas_addr, SAS_ADDR_SIZE);
1447
1448	res = smp_execute_task(dev, cri_req, CRI_REQ_SIZE, cri_resp,
1449			       CRI_RESP_SIZE);
1450	if (res)
1451		goto out;
1452	res = cri_resp[2];
1453	if (res == SMP_RESP_NO_INDEX) {
1454		pr_warn("overflow of indexes: dev %016llx phy%02d index 0x%x\n",
1455			SAS_ADDR(dev->sas_addr), phy_id, index);
1456	}
1457out:
1458	kfree(cri_req);
1459	kfree(cri_resp);
1460	return res;
1461}
1462
1463static int sas_configure_phy(struct domain_device *dev, int phy_id,
1464				    u8 *sas_addr, int include)
1465{
1466	int index;
1467	int present;
1468	int res;
1469
1470	res = sas_configure_present(dev, phy_id, sas_addr, &index, &present);
1471	if (res)
1472		return res;
1473	if (include ^ present)
1474		return sas_configure_set(dev, phy_id, sas_addr, index,
1475					 include);
1476
1477	return res;
1478}
1479
1480/**
1481 * sas_configure_parent - configure routing table of parent
1482 * @parent: parent expander
1483 * @child: child expander
1484 * @sas_addr: SAS port identifier of device directly attached to child
1485 * @include: whether or not to include @child in the expander routing table
1486 */
1487static int sas_configure_parent(struct domain_device *parent,
1488				struct domain_device *child,
1489				u8 *sas_addr, int include)
1490{
1491	struct expander_device *ex_parent = &parent->ex_dev;
1492	int res = 0;
1493	int i;
1494
1495	if (parent->parent) {
1496		res = sas_configure_parent(parent->parent, parent, sas_addr,
1497					   include);
1498		if (res)
1499			return res;
1500	}
1501
1502	if (ex_parent->conf_route_table == 0) {
1503		pr_debug("ex %016llx has self-configuring routing table\n",
1504			 SAS_ADDR(parent->sas_addr));
1505		return 0;
1506	}
1507
1508	for (i = 0; i < ex_parent->num_phys; i++) {
1509		struct ex_phy *phy = &ex_parent->ex_phy[i];
1510
1511		if ((phy->routing_attr == TABLE_ROUTING) &&
1512		    sas_phy_match_dev_addr(child, phy)) {
1513			res = sas_configure_phy(parent, i, sas_addr, include);
1514			if (res)
1515				return res;
1516		}
1517	}
1518
1519	return res;
1520}
1521
1522/**
1523 * sas_configure_routing - configure routing
1524 * @dev: expander device
1525 * @sas_addr: port identifier of device directly attached to the expander device
1526 */
1527static int sas_configure_routing(struct domain_device *dev, u8 *sas_addr)
1528{
1529	if (dev->parent)
1530		return sas_configure_parent(dev->parent, dev, sas_addr, 1);
1531	return 0;
1532}
1533
1534static int sas_disable_routing(struct domain_device *dev,  u8 *sas_addr)
1535{
1536	if (dev->parent)
1537		return sas_configure_parent(dev->parent, dev, sas_addr, 0);
1538	return 0;
1539}
1540
1541/**
1542 * sas_discover_expander - expander discovery
1543 * @dev: pointer to expander domain device
1544 *
1545 * See comment in sas_discover_sata().
1546 */
1547static int sas_discover_expander(struct domain_device *dev)
1548{
1549	int res;
1550
1551	res = sas_notify_lldd_dev_found(dev);
1552	if (res)
1553		return res;
1554
1555	res = sas_ex_general(dev);
1556	if (res)
1557		goto out_err;
1558	res = sas_ex_manuf_info(dev);
1559	if (res)
1560		goto out_err;
1561
1562	res = sas_expander_discover(dev);
1563	if (res) {
1564		pr_warn("expander %016llx discovery failed(0x%x)\n",
1565			SAS_ADDR(dev->sas_addr), res);
1566		goto out_err;
1567	}
1568
1569	sas_check_ex_subtractive_boundary(dev);
1570	res = sas_check_parent_topology(dev);
1571	if (res)
1572		goto out_err;
1573	return 0;
1574out_err:
1575	sas_notify_lldd_dev_gone(dev);
1576	return res;
1577}
1578
1579static int sas_ex_level_discovery(struct asd_sas_port *port, const int level)
1580{
1581	int res = 0;
1582	struct domain_device *dev;
1583
1584	list_for_each_entry(dev, &port->dev_list, dev_list_node) {
1585		if (dev_is_expander(dev->dev_type)) {
1586			struct sas_expander_device *ex =
1587				rphy_to_expander_device(dev->rphy);
1588
1589			if (level == ex->level)
1590				res = sas_ex_discover_devices(dev, -1);
1591			else if (level > 0)
1592				res = sas_ex_discover_devices(port->port_dev, -1);
1593
1594		}
1595	}
1596
1597	return res;
1598}
1599
1600static int sas_ex_bfs_disc(struct asd_sas_port *port)
1601{
1602	int res;
1603	int level;
1604
1605	do {
1606		level = port->disc.max_level;
1607		res = sas_ex_level_discovery(port, level);
1608		mb();
1609	} while (level < port->disc.max_level);
1610
1611	return res;
1612}
1613
1614int sas_discover_root_expander(struct domain_device *dev)
1615{
1616	int res;
1617	struct sas_expander_device *ex = rphy_to_expander_device(dev->rphy);
1618
1619	res = sas_rphy_add(dev->rphy);
1620	if (res)
1621		goto out_err;
1622
1623	ex->level = dev->port->disc.max_level; /* 0 */
1624	res = sas_discover_expander(dev);
1625	if (res)
1626		goto out_err2;
1627
1628	sas_ex_bfs_disc(dev->port);
1629
1630	return res;
1631
1632out_err2:
1633	sas_rphy_remove(dev->rphy);
1634out_err:
1635	return res;
1636}
1637
1638/* ---------- Domain revalidation ---------- */
1639
1640static void sas_get_sas_addr_and_dev_type(struct smp_disc_resp *disc_resp,
1641					  u8 *sas_addr,
1642					  enum sas_device_type *type)
1643{
1644	memcpy(sas_addr, disc_resp->disc.attached_sas_addr, SAS_ADDR_SIZE);
1645	*type = to_dev_type(&disc_resp->disc);
1646	if (*type == SAS_PHY_UNUSED)
1647		memset(sas_addr, 0, SAS_ADDR_SIZE);
1648}
1649
1650static int sas_get_phy_discover(struct domain_device *dev,
1651				int phy_id, struct smp_disc_resp *disc_resp)
1652{
1653	int res;
1654	u8 *disc_req;
1655
1656	disc_req = alloc_smp_req(DISCOVER_REQ_SIZE);
1657	if (!disc_req)
1658		return -ENOMEM;
1659
1660	disc_req[1] = SMP_DISCOVER;
1661	disc_req[9] = phy_id;
1662
1663	res = smp_execute_task(dev, disc_req, DISCOVER_REQ_SIZE,
1664			       disc_resp, DISCOVER_RESP_SIZE);
1665	if (res)
1666		goto out;
1667	if (disc_resp->result != SMP_RESP_FUNC_ACC)
1668		res = disc_resp->result;
1669out:
1670	kfree(disc_req);
1671	return res;
1672}
1673
1674static int sas_get_phy_change_count(struct domain_device *dev,
1675				    int phy_id, int *pcc)
1676{
1677	int res;
1678	struct smp_disc_resp *disc_resp;
1679
1680	disc_resp = alloc_smp_resp(DISCOVER_RESP_SIZE);
1681	if (!disc_resp)
1682		return -ENOMEM;
1683
1684	res = sas_get_phy_discover(dev, phy_id, disc_resp);
1685	if (!res)
1686		*pcc = disc_resp->disc.change_count;
1687
1688	kfree(disc_resp);
1689	return res;
1690}
1691
1692int sas_get_phy_attached_dev(struct domain_device *dev, int phy_id,
1693			     u8 *sas_addr, enum sas_device_type *type)
1694{
1695	int res;
1696	struct smp_disc_resp *disc_resp;
1697
1698	disc_resp = alloc_smp_resp(DISCOVER_RESP_SIZE);
1699	if (!disc_resp)
1700		return -ENOMEM;
1701
1702	res = sas_get_phy_discover(dev, phy_id, disc_resp);
1703	if (res == 0)
1704		sas_get_sas_addr_and_dev_type(disc_resp, sas_addr, type);
1705	kfree(disc_resp);
1706	return res;
1707}
1708
1709static int sas_find_bcast_phy(struct domain_device *dev, int *phy_id,
1710			      int from_phy, bool update)
1711{
1712	struct expander_device *ex = &dev->ex_dev;
1713	int res = 0;
1714	int i;
1715
1716	for (i = from_phy; i < ex->num_phys; i++) {
1717		int phy_change_count = 0;
1718
1719		res = sas_get_phy_change_count(dev, i, &phy_change_count);
1720		switch (res) {
1721		case SMP_RESP_PHY_VACANT:
1722		case SMP_RESP_NO_PHY:
1723			continue;
1724		case SMP_RESP_FUNC_ACC:
1725			break;
1726		default:
1727			return res;
1728		}
1729
1730		if (phy_change_count != ex->ex_phy[i].phy_change_count) {
1731			if (update)
1732				ex->ex_phy[i].phy_change_count =
1733					phy_change_count;
1734			*phy_id = i;
1735			return 0;
1736		}
1737	}
1738	return 0;
1739}
1740
1741static int sas_get_ex_change_count(struct domain_device *dev, int *ecc)
1742{
1743	int res;
1744	u8  *rg_req;
1745	struct smp_rg_resp  *rg_resp;
1746
1747	rg_req = alloc_smp_req(RG_REQ_SIZE);
1748	if (!rg_req)
1749		return -ENOMEM;
1750
1751	rg_resp = alloc_smp_resp(RG_RESP_SIZE);
1752	if (!rg_resp) {
1753		kfree(rg_req);
1754		return -ENOMEM;
1755	}
1756
1757	rg_req[1] = SMP_REPORT_GENERAL;
1758
1759	res = smp_execute_task(dev, rg_req, RG_REQ_SIZE, rg_resp,
1760			       RG_RESP_SIZE);
1761	if (res)
1762		goto out;
1763	if (rg_resp->result != SMP_RESP_FUNC_ACC) {
1764		res = rg_resp->result;
1765		goto out;
1766	}
1767
1768	*ecc = be16_to_cpu(rg_resp->rg.change_count);
1769out:
1770	kfree(rg_resp);
1771	kfree(rg_req);
1772	return res;
1773}
1774/**
1775 * sas_find_bcast_dev -  find the device issue BROADCAST(CHANGE).
1776 * @dev:domain device to be detect.
1777 * @src_dev: the device which originated BROADCAST(CHANGE).
1778 *
1779 * Add self-configuration expander support. Suppose two expander cascading,
1780 * when the first level expander is self-configuring, hotplug the disks in
1781 * second level expander, BROADCAST(CHANGE) will not only be originated
1782 * in the second level expander, but also be originated in the first level
1783 * expander (see SAS protocol SAS 2r-14, 7.11 for detail), it is to say,
1784 * expander changed count in two level expanders will all increment at least
1785 * once, but the phy which chang count has changed is the source device which
1786 * we concerned.
1787 */
1788
1789static int sas_find_bcast_dev(struct domain_device *dev,
1790			      struct domain_device **src_dev)
1791{
1792	struct expander_device *ex = &dev->ex_dev;
1793	int ex_change_count = -1;
1794	int phy_id = -1;
1795	int res;
1796	struct domain_device *ch;
1797
1798	res = sas_get_ex_change_count(dev, &ex_change_count);
1799	if (res)
1800		goto out;
1801	if (ex_change_count != -1 && ex_change_count != ex->ex_change_count) {
1802		/* Just detect if this expander phys phy change count changed,
1803		* in order to determine if this expander originate BROADCAST,
1804		* and do not update phy change count field in our structure.
1805		*/
1806		res = sas_find_bcast_phy(dev, &phy_id, 0, false);
1807		if (phy_id != -1) {
1808			*src_dev = dev;
1809			ex->ex_change_count = ex_change_count;
1810			pr_info("ex %016llx phy%02d change count has changed\n",
1811				SAS_ADDR(dev->sas_addr), phy_id);
1812			return res;
1813		} else
1814			pr_info("ex %016llx phys DID NOT change\n",
1815				SAS_ADDR(dev->sas_addr));
1816	}
1817	list_for_each_entry(ch, &ex->children, siblings) {
1818		if (dev_is_expander(ch->dev_type)) {
1819			res = sas_find_bcast_dev(ch, src_dev);
1820			if (*src_dev)
1821				return res;
1822		}
1823	}
1824out:
1825	return res;
1826}
1827
1828static void sas_unregister_ex_tree(struct asd_sas_port *port, struct domain_device *dev)
1829{
1830	struct expander_device *ex = &dev->ex_dev;
1831	struct domain_device *child, *n;
1832
1833	list_for_each_entry_safe(child, n, &ex->children, siblings) {
1834		set_bit(SAS_DEV_GONE, &child->state);
1835		if (dev_is_expander(child->dev_type))
1836			sas_unregister_ex_tree(port, child);
1837		else
1838			sas_unregister_dev(port, child);
1839	}
1840	sas_unregister_dev(port, dev);
1841}
1842
1843static void sas_unregister_devs_sas_addr(struct domain_device *parent,
1844					 int phy_id, bool last)
1845{
1846	struct expander_device *ex_dev = &parent->ex_dev;
1847	struct ex_phy *phy = &ex_dev->ex_phy[phy_id];
1848	struct domain_device *child, *n, *found = NULL;
1849	if (last) {
1850		list_for_each_entry_safe(child, n,
1851			&ex_dev->children, siblings) {
1852			if (sas_phy_match_dev_addr(child, phy)) {
1853				set_bit(SAS_DEV_GONE, &child->state);
1854				if (dev_is_expander(child->dev_type))
1855					sas_unregister_ex_tree(parent->port, child);
1856				else
1857					sas_unregister_dev(parent->port, child);
1858				found = child;
1859				break;
1860			}
1861		}
1862		sas_disable_routing(parent, phy->attached_sas_addr);
1863	}
1864	memset(phy->attached_sas_addr, 0, SAS_ADDR_SIZE);
1865	if (phy->port) {
1866		sas_port_delete_phy(phy->port, phy->phy);
1867		sas_device_set_phy(found, phy->port);
1868		if (phy->port->num_phys == 0) {
1869			list_add_tail(&phy->port->del_list,
1870				&parent->port->sas_port_del_list);
1871			if (ex_dev->parent_port == phy->port)
1872				ex_dev->parent_port = NULL;
1873		}
1874		phy->port = NULL;
1875	}
1876}
1877
1878static int sas_discover_bfs_by_root_level(struct domain_device *root,
1879					  const int level)
1880{
1881	struct expander_device *ex_root = &root->ex_dev;
1882	struct domain_device *child;
1883	int res = 0;
1884
1885	list_for_each_entry(child, &ex_root->children, siblings) {
1886		if (dev_is_expander(child->dev_type)) {
1887			struct sas_expander_device *ex =
1888				rphy_to_expander_device(child->rphy);
1889
1890			if (level > ex->level)
1891				res = sas_discover_bfs_by_root_level(child,
1892								     level);
1893			else if (level == ex->level)
1894				res = sas_ex_discover_devices(child, -1);
1895		}
1896	}
1897	return res;
1898}
1899
1900static int sas_discover_bfs_by_root(struct domain_device *dev)
1901{
1902	int res;
1903	struct sas_expander_device *ex = rphy_to_expander_device(dev->rphy);
1904	int level = ex->level+1;
1905
1906	res = sas_ex_discover_devices(dev, -1);
1907	if (res)
1908		goto out;
1909	do {
1910		res = sas_discover_bfs_by_root_level(dev, level);
1911		mb();
1912		level += 1;
1913	} while (level <= dev->port->disc.max_level);
1914out:
1915	return res;
1916}
1917
1918static int sas_discover_new(struct domain_device *dev, int phy_id)
1919{
1920	struct ex_phy *ex_phy = &dev->ex_dev.ex_phy[phy_id];
1921	struct domain_device *child;
1922	int res;
1923
1924	pr_debug("ex %016llx phy%02d new device attached\n",
1925		 SAS_ADDR(dev->sas_addr), phy_id);
1926	res = sas_ex_phy_discover(dev, phy_id);
1927	if (res)
1928		return res;
1929
1930	if (sas_ex_join_wide_port(dev, phy_id))
1931		return 0;
1932
1933	res = sas_ex_discover_devices(dev, phy_id);
1934	if (res)
1935		return res;
1936	list_for_each_entry(child, &dev->ex_dev.children, siblings) {
1937		if (sas_phy_match_dev_addr(child, ex_phy)) {
1938			if (dev_is_expander(child->dev_type))
1939				res = sas_discover_bfs_by_root(child);
1940			break;
1941		}
1942	}
1943	return res;
1944}
1945
1946static bool dev_type_flutter(enum sas_device_type new, enum sas_device_type old)
1947{
1948	if (old == new)
1949		return true;
1950
1951	/* treat device directed resets as flutter, if we went
1952	 * SAS_END_DEVICE to SAS_SATA_PENDING the link needs recovery
1953	 */
1954	if ((old == SAS_SATA_PENDING && new == SAS_END_DEVICE) ||
1955	    (old == SAS_END_DEVICE && new == SAS_SATA_PENDING))
1956		return true;
1957
1958	return false;
1959}
1960
1961static int sas_rediscover_dev(struct domain_device *dev, int phy_id,
1962			      bool last, int sibling)
1963{
1964	struct expander_device *ex = &dev->ex_dev;
1965	struct ex_phy *phy = &ex->ex_phy[phy_id];
1966	enum sas_device_type type = SAS_PHY_UNUSED;
1967	struct smp_disc_resp *disc_resp;
1968	u8 sas_addr[SAS_ADDR_SIZE];
1969	char msg[80] = "";
1970	int res;
1971
1972	if (!last)
1973		sprintf(msg, ", part of a wide port with phy%02d", sibling);
1974
1975	pr_debug("ex %016llx rediscovering phy%02d%s\n",
1976		 SAS_ADDR(dev->sas_addr), phy_id, msg);
1977
1978	memset(sas_addr, 0, SAS_ADDR_SIZE);
1979	disc_resp = alloc_smp_resp(DISCOVER_RESP_SIZE);
1980	if (!disc_resp)
1981		return -ENOMEM;
1982
1983	res = sas_get_phy_discover(dev, phy_id, disc_resp);
1984	switch (res) {
1985	case SMP_RESP_NO_PHY:
1986		phy->phy_state = PHY_NOT_PRESENT;
1987		sas_unregister_devs_sas_addr(dev, phy_id, last);
1988		goto out_free_resp;
1989	case SMP_RESP_PHY_VACANT:
1990		phy->phy_state = PHY_VACANT;
1991		sas_unregister_devs_sas_addr(dev, phy_id, last);
1992		goto out_free_resp;
1993	case SMP_RESP_FUNC_ACC:
1994		break;
1995	case -ECOMM:
1996		break;
1997	default:
1998		goto out_free_resp;
1999	}
2000
2001	if (res == 0)
2002		sas_get_sas_addr_and_dev_type(disc_resp, sas_addr, &type);
2003
2004	if ((SAS_ADDR(sas_addr) == 0) || (res == -ECOMM)) {
2005		phy->phy_state = PHY_EMPTY;
2006		sas_unregister_devs_sas_addr(dev, phy_id, last);
2007		/*
2008		 * Even though the PHY is empty, for convenience we update
2009		 * the PHY info, like negotiated linkrate.
2010		 */
2011		if (res == 0)
2012			sas_set_ex_phy(dev, phy_id, disc_resp);
2013		goto out_free_resp;
2014	} else if (SAS_ADDR(sas_addr) == SAS_ADDR(phy->attached_sas_addr) &&
2015		   dev_type_flutter(type, phy->attached_dev_type)) {
2016		struct domain_device *ata_dev = sas_ex_to_ata(dev, phy_id);
2017		char *action = "";
2018
2019		sas_ex_phy_discover(dev, phy_id);
2020
2021		if (ata_dev && phy->attached_dev_type == SAS_SATA_PENDING)
2022			action = ", needs recovery";
2023		pr_debug("ex %016llx phy%02d broadcast flutter%s\n",
2024			 SAS_ADDR(dev->sas_addr), phy_id, action);
2025		goto out_free_resp;
2026	}
2027
2028	/* we always have to delete the old device when we went here */
2029	pr_info("ex %016llx phy%02d replace %016llx\n",
2030		SAS_ADDR(dev->sas_addr), phy_id,
2031		SAS_ADDR(phy->attached_sas_addr));
2032	sas_unregister_devs_sas_addr(dev, phy_id, last);
2033
2034	res = sas_discover_new(dev, phy_id);
2035out_free_resp:
2036	kfree(disc_resp);
2037	return res;
2038}
2039
2040/**
2041 * sas_rediscover - revalidate the domain.
2042 * @dev:domain device to be detect.
2043 * @phy_id: the phy id will be detected.
2044 *
2045 * NOTE: this process _must_ quit (return) as soon as any connection
2046 * errors are encountered.  Connection recovery is done elsewhere.
2047 * Discover process only interrogates devices in order to discover the
2048 * domain.For plugging out, we un-register the device only when it is
2049 * the last phy in the port, for other phys in this port, we just delete it
2050 * from the port.For inserting, we do discovery when it is the
2051 * first phy,for other phys in this port, we add it to the port to
2052 * forming the wide-port.
2053 */
2054static int sas_rediscover(struct domain_device *dev, const int phy_id)
2055{
2056	struct expander_device *ex = &dev->ex_dev;
2057	struct ex_phy *changed_phy = &ex->ex_phy[phy_id];
2058	int res = 0;
2059	int i;
2060	bool last = true;	/* is this the last phy of the port */
2061
2062	pr_debug("ex %016llx phy%02d originated BROADCAST(CHANGE)\n",
2063		 SAS_ADDR(dev->sas_addr), phy_id);
2064
2065	if (SAS_ADDR(changed_phy->attached_sas_addr) != 0) {
2066		for (i = 0; i < ex->num_phys; i++) {
2067			struct ex_phy *phy = &ex->ex_phy[i];
2068
2069			if (i == phy_id)
2070				continue;
2071			if (sas_phy_addr_match(phy, changed_phy)) {
2072				last = false;
2073				break;
2074			}
2075		}
2076		res = sas_rediscover_dev(dev, phy_id, last, i);
2077	} else
2078		res = sas_discover_new(dev, phy_id);
2079	return res;
2080}
2081
2082/**
2083 * sas_ex_revalidate_domain - revalidate the domain
2084 * @port_dev: port domain device.
2085 *
2086 * NOTE: this process _must_ quit (return) as soon as any connection
2087 * errors are encountered.  Connection recovery is done elsewhere.
2088 * Discover process only interrogates devices in order to discover the
2089 * domain.
2090 */
2091int sas_ex_revalidate_domain(struct domain_device *port_dev)
2092{
2093	int res;
2094	struct domain_device *dev = NULL;
2095
2096	res = sas_find_bcast_dev(port_dev, &dev);
2097	if (res == 0 && dev) {
2098		struct expander_device *ex = &dev->ex_dev;
2099		int i = 0, phy_id;
2100
2101		do {
2102			phy_id = -1;
2103			res = sas_find_bcast_phy(dev, &phy_id, i, true);
2104			if (phy_id == -1)
2105				break;
2106			res = sas_rediscover(dev, phy_id);
2107			i = phy_id + 1;
2108		} while (i < ex->num_phys);
2109	}
2110	return res;
2111}
2112
2113int sas_find_attached_phy_id(struct expander_device *ex_dev,
2114			     struct domain_device *dev)
2115{
2116	struct ex_phy *phy;
2117	int phy_id;
2118
2119	for (phy_id = 0; phy_id < ex_dev->num_phys; phy_id++) {
2120		phy = &ex_dev->ex_phy[phy_id];
2121		if (sas_phy_match_dev_addr(dev, phy))
2122			return phy_id;
2123	}
2124
2125	return -ENODEV;
2126}
2127EXPORT_SYMBOL_GPL(sas_find_attached_phy_id);
2128
2129void sas_smp_handler(struct bsg_job *job, struct Scsi_Host *shost,
2130		struct sas_rphy *rphy)
2131{
2132	struct domain_device *dev;
2133	unsigned int rcvlen = 0;
2134	int ret = -EINVAL;
2135
2136	/* no rphy means no smp target support (ie aic94xx host) */
2137	if (!rphy)
2138		return sas_smp_host_handler(job, shost);
2139
2140	switch (rphy->identify.device_type) {
2141	case SAS_EDGE_EXPANDER_DEVICE:
2142	case SAS_FANOUT_EXPANDER_DEVICE:
2143		break;
2144	default:
2145		pr_err("%s: can we send a smp request to a device?\n",
2146		       __func__);
2147		goto out;
2148	}
2149
2150	dev = sas_find_dev_by_rphy(rphy);
2151	if (!dev) {
2152		pr_err("%s: fail to find a domain_device?\n", __func__);
2153		goto out;
2154	}
2155
2156	/* do we need to support multiple segments? */
2157	if (job->request_payload.sg_cnt > 1 ||
2158	    job->reply_payload.sg_cnt > 1) {
2159		pr_info("%s: multiple segments req %u, rsp %u\n",
2160			__func__, job->request_payload.payload_len,
2161			job->reply_payload.payload_len);
2162		goto out;
2163	}
2164
2165	ret = smp_execute_task_sg(dev, job->request_payload.sg_list,
2166			job->reply_payload.sg_list);
2167	if (ret >= 0) {
2168		/* bsg_job_done() requires the length received  */
2169		rcvlen = job->reply_payload.payload_len - ret;
2170		ret = 0;
2171	}
2172
2173out:
2174	bsg_job_done(job, ret, rcvlen);
2175}