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linux-6.19.14/drivers/firmware/arm_ffa/driver.c
1// SPDX-License-Identifier: GPL-2.0-only 2/* 3 * Arm Firmware Framework for ARMv8-A(FFA) interface driver 4 * 5 * The Arm FFA specification[1] describes a software architecture to 6 * leverages the virtualization extension to isolate software images 7 * provided by an ecosystem of vendors from each other and describes 8 * interfaces that standardize communication between the various software 9 * images including communication between images in the Secure world and 10 * Normal world. Any Hypervisor could use the FFA interfaces to enable 11 * communication between VMs it manages. 12 * 13 * The Hypervisor a.k.a Partition managers in FFA terminology can assign 14 * system resources(Memory regions, Devices, CPU cycles) to the partitions 15 * and manage isolation amongst them. 16 * 17 * [1] https://developer.arm.com/docs/den0077/latest 18 * 19 * Copyright (C) 2021 ARM Ltd. 20 */ 21 22#define DRIVER_NAME "ARM FF-A" 23#define pr_fmt(fmt) DRIVER_NAME ": " fmt 24 25#include <linux/acpi.h> 26#include <linux/arm_ffa.h> 27#include <linux/bitfield.h> 28#include <linux/cpuhotplug.h> 29#include <linux/delay.h> 30#include <linux/device.h> 31#include <linux/hashtable.h> 32#include <linux/interrupt.h> 33#include <linux/io.h> 34#include <linux/kernel.h> 35#include <linux/module.h> 36#include <linux/mm.h> 37#include <linux/mutex.h> 38#include <linux/of_irq.h> 39#include <linux/scatterlist.h> 40#include <linux/slab.h> 41#include <linux/smp.h> 42#include <linux/uuid.h> 43#include <linux/xarray.h> 44 45#include "common.h" 46 47#define FFA_DRIVER_VERSION FFA_VERSION_1_2 48#define FFA_MIN_VERSION FFA_VERSION_1_0 49 50#define SENDER_ID_MASK GENMASK(31, 16) 51#define RECEIVER_ID_MASK GENMASK(15, 0) 52#define SENDER_ID(x) ((u16)(FIELD_GET(SENDER_ID_MASK, (x)))) 53#define RECEIVER_ID(x) ((u16)(FIELD_GET(RECEIVER_ID_MASK, (x)))) 54#define PACK_TARGET_INFO(s, r) \ 55 (FIELD_PREP(SENDER_ID_MASK, (s)) | FIELD_PREP(RECEIVER_ID_MASK, (r))) 56 57#define RXTX_MAP_MIN_BUFSZ_MASK GENMASK(1, 0) 58#define RXTX_MAP_MIN_BUFSZ(x) ((x) & RXTX_MAP_MIN_BUFSZ_MASK) 59 60#define FFA_MAX_NOTIFICATIONS 64 61 62static ffa_fn *invoke_ffa_fn; 63 64static const int ffa_linux_errmap[] = { 65 /* better than switch case as long as return value is continuous */ 66 0, /* FFA_RET_SUCCESS */ 67 -EOPNOTSUPP, /* FFA_RET_NOT_SUPPORTED */ 68 -EINVAL, /* FFA_RET_INVALID_PARAMETERS */ 69 -ENOMEM, /* FFA_RET_NO_MEMORY */ 70 -EBUSY, /* FFA_RET_BUSY */ 71 -EINTR, /* FFA_RET_INTERRUPTED */ 72 -EACCES, /* FFA_RET_DENIED */ 73 -EAGAIN, /* FFA_RET_RETRY */ 74 -ECANCELED, /* FFA_RET_ABORTED */ 75 -ENODATA, /* FFA_RET_NO_DATA */ 76 -EAGAIN, /* FFA_RET_NOT_READY */ 77}; 78 79static inline int ffa_to_linux_errno(int errno) 80{ 81 int err_idx = -errno; 82 83 if (err_idx >= 0 && err_idx < ARRAY_SIZE(ffa_linux_errmap)) 84 return ffa_linux_errmap[err_idx]; 85 return -EINVAL; 86} 87 88struct ffa_pcpu_irq { 89 struct ffa_drv_info *info; 90}; 91 92struct ffa_drv_info { 93 u32 version; 94 u16 vm_id; 95 struct mutex rx_lock; /* lock to protect Rx buffer */ 96 struct mutex tx_lock; /* lock to protect Tx buffer */ 97 void *rx_buffer; 98 void *tx_buffer; 99 size_t rxtx_bufsz; 100 bool mem_ops_native; 101 bool msg_direct_req2_supp; 102 bool bitmap_created; 103 bool notif_enabled; 104 unsigned int sched_recv_irq; 105 unsigned int notif_pend_irq; 106 unsigned int cpuhp_state; 107 struct ffa_pcpu_irq __percpu *irq_pcpu; 108 struct workqueue_struct *notif_pcpu_wq; 109 struct work_struct notif_pcpu_work; 110 struct work_struct sched_recv_irq_work; 111 struct xarray partition_info; 112 DECLARE_HASHTABLE(notifier_hash, ilog2(FFA_MAX_NOTIFICATIONS)); 113 rwlock_t notify_lock; /* lock to protect notifier hashtable */ 114}; 115 116static struct ffa_drv_info *drv_info; 117 118/* 119 * The driver must be able to support all the versions from the earliest 120 * supported FFA_MIN_VERSION to the latest supported FFA_DRIVER_VERSION. 121 * The specification states that if firmware supports a FFA implementation 122 * that is incompatible with and at a greater version number than specified 123 * by the caller(FFA_DRIVER_VERSION passed as parameter to FFA_VERSION), 124 * it must return the NOT_SUPPORTED error code. 125 */ 126static u32 ffa_compatible_version_find(u32 version) 127{ 128 u16 major = FFA_MAJOR_VERSION(version), minor = FFA_MINOR_VERSION(version); 129 u16 drv_major = FFA_MAJOR_VERSION(FFA_DRIVER_VERSION); 130 u16 drv_minor = FFA_MINOR_VERSION(FFA_DRIVER_VERSION); 131 132 if ((major < drv_major) || (major == drv_major && minor <= drv_minor)) 133 return version; 134 135 pr_info("Firmware version higher than driver version, downgrading\n"); 136 return FFA_DRIVER_VERSION; 137} 138 139static int ffa_version_check(u32 *version) 140{ 141 ffa_value_t ver; 142 143 invoke_ffa_fn((ffa_value_t){ 144 .a0 = FFA_VERSION, .a1 = FFA_DRIVER_VERSION, 145 }, &ver); 146 147 if ((s32)ver.a0 == FFA_RET_NOT_SUPPORTED) { 148 pr_info("FFA_VERSION returned not supported\n"); 149 return -EOPNOTSUPP; 150 } 151 152 if (FFA_MAJOR_VERSION(ver.a0) > FFA_MAJOR_VERSION(FFA_DRIVER_VERSION)) { 153 pr_err("Incompatible v%d.%d! Latest supported v%d.%d\n", 154 FFA_MAJOR_VERSION(ver.a0), FFA_MINOR_VERSION(ver.a0), 155 FFA_MAJOR_VERSION(FFA_DRIVER_VERSION), 156 FFA_MINOR_VERSION(FFA_DRIVER_VERSION)); 157 return -EINVAL; 158 } 159 160 if (ver.a0 < FFA_MIN_VERSION) { 161 pr_err("Incompatible v%d.%d! Earliest supported v%d.%d\n", 162 FFA_MAJOR_VERSION(ver.a0), FFA_MINOR_VERSION(ver.a0), 163 FFA_MAJOR_VERSION(FFA_MIN_VERSION), 164 FFA_MINOR_VERSION(FFA_MIN_VERSION)); 165 return -EINVAL; 166 } 167 168 pr_info("Driver version %d.%d\n", FFA_MAJOR_VERSION(FFA_DRIVER_VERSION), 169 FFA_MINOR_VERSION(FFA_DRIVER_VERSION)); 170 pr_info("Firmware version %d.%d found\n", FFA_MAJOR_VERSION(ver.a0), 171 FFA_MINOR_VERSION(ver.a0)); 172 *version = ffa_compatible_version_find(ver.a0); 173 174 return 0; 175} 176 177static int ffa_rx_release(void) 178{ 179 ffa_value_t ret; 180 181 invoke_ffa_fn((ffa_value_t){ 182 .a0 = FFA_RX_RELEASE, 183 }, &ret); 184 185 if (ret.a0 == FFA_ERROR) 186 return ffa_to_linux_errno((int)ret.a2); 187 188 /* check for ret.a0 == FFA_RX_RELEASE ? */ 189 190 return 0; 191} 192 193static int ffa_rxtx_map(phys_addr_t tx_buf, phys_addr_t rx_buf, u32 pg_cnt) 194{ 195 ffa_value_t ret; 196 197 invoke_ffa_fn((ffa_value_t){ 198 .a0 = FFA_FN_NATIVE(RXTX_MAP), 199 .a1 = tx_buf, .a2 = rx_buf, .a3 = pg_cnt, 200 }, &ret); 201 202 if (ret.a0 == FFA_ERROR) 203 return ffa_to_linux_errno((int)ret.a2); 204 205 return 0; 206} 207 208static int ffa_rxtx_unmap(void) 209{ 210 ffa_value_t ret; 211 212 invoke_ffa_fn((ffa_value_t){ 213 .a0 = FFA_RXTX_UNMAP, 214 }, &ret); 215 216 if (ret.a0 == FFA_ERROR) 217 return ffa_to_linux_errno((int)ret.a2); 218 219 return 0; 220} 221 222static int ffa_features(u32 func_feat_id, u32 input_props, 223 u32 *if_props_1, u32 *if_props_2) 224{ 225 ffa_value_t id; 226 227 if (!ARM_SMCCC_IS_FAST_CALL(func_feat_id) && input_props) { 228 pr_err("%s: Invalid Parameters: %x, %x", __func__, 229 func_feat_id, input_props); 230 return ffa_to_linux_errno(FFA_RET_INVALID_PARAMETERS); 231 } 232 233 invoke_ffa_fn((ffa_value_t){ 234 .a0 = FFA_FEATURES, .a1 = func_feat_id, .a2 = input_props, 235 }, &id); 236 237 if (id.a0 == FFA_ERROR) 238 return ffa_to_linux_errno((int)id.a2); 239 240 if (if_props_1) 241 *if_props_1 = id.a2; 242 if (if_props_2) 243 *if_props_2 = id.a3; 244 245 return 0; 246} 247 248#define PARTITION_INFO_GET_RETURN_COUNT_ONLY BIT(0) 249 250/* buffer must be sizeof(struct ffa_partition_info) * num_partitions */ 251static int 252__ffa_partition_info_get(u32 uuid0, u32 uuid1, u32 uuid2, u32 uuid3, 253 struct ffa_partition_info *buffer, int num_partitions) 254{ 255 int idx, count, flags = 0, sz, buf_sz; 256 ffa_value_t partition_info; 257 258 if (drv_info->version > FFA_VERSION_1_0 && 259 (!buffer || !num_partitions)) /* Just get the count for now */ 260 flags = PARTITION_INFO_GET_RETURN_COUNT_ONLY; 261 262 mutex_lock(&drv_info->rx_lock); 263 invoke_ffa_fn((ffa_value_t){ 264 .a0 = FFA_PARTITION_INFO_GET, 265 .a1 = uuid0, .a2 = uuid1, .a3 = uuid2, .a4 = uuid3, 266 .a5 = flags, 267 }, &partition_info); 268 269 if (partition_info.a0 == FFA_ERROR) { 270 mutex_unlock(&drv_info->rx_lock); 271 return ffa_to_linux_errno((int)partition_info.a2); 272 } 273 274 count = partition_info.a2; 275 276 if (drv_info->version > FFA_VERSION_1_0) { 277 buf_sz = sz = partition_info.a3; 278 if (sz > sizeof(*buffer)) 279 buf_sz = sizeof(*buffer); 280 } else { 281 /* FFA_VERSION_1_0 lacks size in the response */ 282 buf_sz = sz = 8; 283 } 284 285 if (buffer && count <= num_partitions) 286 for (idx = 0; idx < count; idx++) { 287 struct ffa_partition_info_le { 288 __le16 id; 289 __le16 exec_ctxt; 290 __le32 properties; 291 uuid_t uuid; 292 } *rx_buf = drv_info->rx_buffer + idx * sz; 293 struct ffa_partition_info *buf = buffer + idx; 294 295 buf->id = le16_to_cpu(rx_buf->id); 296 buf->exec_ctxt = le16_to_cpu(rx_buf->exec_ctxt); 297 buf->properties = le32_to_cpu(rx_buf->properties); 298 if (buf_sz > 8) 299 import_uuid(&buf->uuid, (u8 *)&rx_buf->uuid); 300 } 301 302 if (!(flags & PARTITION_INFO_GET_RETURN_COUNT_ONLY)) 303 ffa_rx_release(); 304 305 mutex_unlock(&drv_info->rx_lock); 306 307 return count; 308} 309 310#define LAST_INDEX_MASK GENMASK(15, 0) 311#define CURRENT_INDEX_MASK GENMASK(31, 16) 312#define UUID_INFO_TAG_MASK GENMASK(47, 32) 313#define PARTITION_INFO_SZ_MASK GENMASK(63, 48) 314#define PARTITION_COUNT(x) ((u16)(FIELD_GET(LAST_INDEX_MASK, (x))) + 1) 315#define CURRENT_INDEX(x) ((u16)(FIELD_GET(CURRENT_INDEX_MASK, (x)))) 316#define UUID_INFO_TAG(x) ((u16)(FIELD_GET(UUID_INFO_TAG_MASK, (x)))) 317#define PARTITION_INFO_SZ(x) ((u16)(FIELD_GET(PARTITION_INFO_SZ_MASK, (x)))) 318#define PART_INFO_ID_MASK GENMASK(15, 0) 319#define PART_INFO_EXEC_CXT_MASK GENMASK(31, 16) 320#define PART_INFO_PROPS_MASK GENMASK(63, 32) 321#define PART_INFO_ID(x) ((u16)(FIELD_GET(PART_INFO_ID_MASK, (x)))) 322#define PART_INFO_EXEC_CXT(x) ((u16)(FIELD_GET(PART_INFO_EXEC_CXT_MASK, (x)))) 323#define PART_INFO_PROPERTIES(x) ((u32)(FIELD_GET(PART_INFO_PROPS_MASK, (x)))) 324static int 325__ffa_partition_info_get_regs(u32 uuid0, u32 uuid1, u32 uuid2, u32 uuid3, 326 struct ffa_partition_info *buffer, int num_parts) 327{ 328 u16 buf_sz, start_idx, cur_idx, count = 0, prev_idx = 0, tag = 0; 329 struct ffa_partition_info *buf = buffer; 330 ffa_value_t partition_info; 331 332 do { 333 __le64 *regs; 334 int idx; 335 336 start_idx = prev_idx ? prev_idx + 1 : 0; 337 338 invoke_ffa_fn((ffa_value_t){ 339 .a0 = FFA_PARTITION_INFO_GET_REGS, 340 .a1 = (u64)uuid1 << 32 | uuid0, 341 .a2 = (u64)uuid3 << 32 | uuid2, 342 .a3 = start_idx | tag << 16, 343 }, &partition_info); 344 345 if (partition_info.a0 == FFA_ERROR) 346 return ffa_to_linux_errno((int)partition_info.a2); 347 348 if (!count) 349 count = PARTITION_COUNT(partition_info.a2); 350 if (!buffer || !num_parts) /* count only */ 351 return count; 352 353 cur_idx = CURRENT_INDEX(partition_info.a2); 354 tag = UUID_INFO_TAG(partition_info.a2); 355 buf_sz = PARTITION_INFO_SZ(partition_info.a2); 356 if (buf_sz > sizeof(*buffer)) 357 buf_sz = sizeof(*buffer); 358 359 regs = (void *)&partition_info.a3; 360 for (idx = 0; idx < cur_idx - start_idx + 1; idx++, buf++) { 361 union { 362 uuid_t uuid; 363 u64 regs[2]; 364 } uuid_regs = { 365 .regs = { 366 le64_to_cpu(*(regs + 1)), 367 le64_to_cpu(*(regs + 2)), 368 } 369 }; 370 u64 val = *(u64 *)regs; 371 372 buf->id = PART_INFO_ID(val); 373 buf->exec_ctxt = PART_INFO_EXEC_CXT(val); 374 buf->properties = PART_INFO_PROPERTIES(val); 375 uuid_copy(&buf->uuid, &uuid_regs.uuid); 376 regs += 3; 377 } 378 prev_idx = cur_idx; 379 380 } while (cur_idx < (count - 1)); 381 382 return count; 383} 384 385/* buffer is allocated and caller must free the same if returned count > 0 */ 386static int 387ffa_partition_probe(const uuid_t *uuid, struct ffa_partition_info **buffer) 388{ 389 int count; 390 u32 uuid0_4[4]; 391 bool reg_mode = false; 392 struct ffa_partition_info *pbuf; 393 394 if (!ffa_features(FFA_PARTITION_INFO_GET_REGS, 0, NULL, NULL)) 395 reg_mode = true; 396 397 export_uuid((u8 *)uuid0_4, uuid); 398 if (reg_mode) 399 count = __ffa_partition_info_get_regs(uuid0_4[0], uuid0_4[1], 400 uuid0_4[2], uuid0_4[3], 401 NULL, 0); 402 else 403 count = __ffa_partition_info_get(uuid0_4[0], uuid0_4[1], 404 uuid0_4[2], uuid0_4[3], 405 NULL, 0); 406 if (count <= 0) 407 return count; 408 409 pbuf = kcalloc(count, sizeof(*pbuf), GFP_KERNEL); 410 if (!pbuf) 411 return -ENOMEM; 412 413 if (reg_mode) 414 count = __ffa_partition_info_get_regs(uuid0_4[0], uuid0_4[1], 415 uuid0_4[2], uuid0_4[3], 416 pbuf, count); 417 else 418 count = __ffa_partition_info_get(uuid0_4[0], uuid0_4[1], 419 uuid0_4[2], uuid0_4[3], 420 pbuf, count); 421 if (count <= 0) 422 kfree(pbuf); 423 else 424 *buffer = pbuf; 425 426 return count; 427} 428 429#define VM_ID_MASK GENMASK(15, 0) 430static int ffa_id_get(u16 *vm_id) 431{ 432 ffa_value_t id; 433 434 invoke_ffa_fn((ffa_value_t){ 435 .a0 = FFA_ID_GET, 436 }, &id); 437 438 if (id.a0 == FFA_ERROR) 439 return ffa_to_linux_errno((int)id.a2); 440 441 *vm_id = FIELD_GET(VM_ID_MASK, (id.a2)); 442 443 return 0; 444} 445 446static inline void ffa_msg_send_wait_for_completion(ffa_value_t *ret) 447{ 448 while (ret->a0 == FFA_INTERRUPT || ret->a0 == FFA_YIELD) { 449 if (ret->a0 == FFA_YIELD) 450 fsleep(1000); 451 452 invoke_ffa_fn((ffa_value_t){ 453 .a0 = FFA_RUN, .a1 = ret->a1, 454 }, ret); 455 } 456} 457 458static int ffa_msg_send_direct_req(u16 src_id, u16 dst_id, bool mode_32bit, 459 struct ffa_send_direct_data *data) 460{ 461 u32 req_id, resp_id, src_dst_ids = PACK_TARGET_INFO(src_id, dst_id); 462 ffa_value_t ret; 463 464 if (mode_32bit) { 465 req_id = FFA_MSG_SEND_DIRECT_REQ; 466 resp_id = FFA_MSG_SEND_DIRECT_RESP; 467 } else { 468 req_id = FFA_FN_NATIVE(MSG_SEND_DIRECT_REQ); 469 resp_id = FFA_FN_NATIVE(MSG_SEND_DIRECT_RESP); 470 } 471 472 invoke_ffa_fn((ffa_value_t){ 473 .a0 = req_id, .a1 = src_dst_ids, .a2 = 0, 474 .a3 = data->data0, .a4 = data->data1, .a5 = data->data2, 475 .a6 = data->data3, .a7 = data->data4, 476 }, &ret); 477 478 ffa_msg_send_wait_for_completion(&ret); 479 480 if (ret.a0 == FFA_ERROR) 481 return ffa_to_linux_errno((int)ret.a2); 482 483 if (ret.a0 == resp_id) { 484 data->data0 = ret.a3; 485 data->data1 = ret.a4; 486 data->data2 = ret.a5; 487 data->data3 = ret.a6; 488 data->data4 = ret.a7; 489 return 0; 490 } 491 492 return -EINVAL; 493} 494 495static int ffa_msg_send2(struct ffa_device *dev, u16 src_id, void *buf, size_t sz) 496{ 497 u32 src_dst_ids = PACK_TARGET_INFO(src_id, dev->vm_id); 498 struct ffa_indirect_msg_hdr *msg; 499 ffa_value_t ret; 500 int retval = 0; 501 502 if (sz > (drv_info->rxtx_bufsz - sizeof(*msg))) 503 return -ERANGE; 504 505 mutex_lock(&drv_info->tx_lock); 506 507 msg = drv_info->tx_buffer; 508 msg->flags = 0; 509 msg->res0 = 0; 510 msg->offset = sizeof(*msg); 511 msg->send_recv_id = src_dst_ids; 512 msg->size = sz; 513 uuid_copy(&msg->uuid, &dev->uuid); 514 memcpy((u8 *)msg + msg->offset, buf, sz); 515 516 /* flags = 0, sender VMID = 0 works for both physical/virtual NS */ 517 invoke_ffa_fn((ffa_value_t){ 518 .a0 = FFA_MSG_SEND2, .a1 = 0, .a2 = 0 519 }, &ret); 520 521 if (ret.a0 == FFA_ERROR) 522 retval = ffa_to_linux_errno((int)ret.a2); 523 524 mutex_unlock(&drv_info->tx_lock); 525 return retval; 526} 527 528static int ffa_msg_send_direct_req2(u16 src_id, u16 dst_id, const uuid_t *uuid, 529 struct ffa_send_direct_data2 *data) 530{ 531 u32 src_dst_ids = PACK_TARGET_INFO(src_id, dst_id); 532 union { 533 uuid_t uuid; 534 __le64 regs[2]; 535 } uuid_regs = { .uuid = *uuid }; 536 ffa_value_t ret, args = { 537 .a0 = FFA_MSG_SEND_DIRECT_REQ2, 538 .a1 = src_dst_ids, 539 .a2 = le64_to_cpu(uuid_regs.regs[0]), 540 .a3 = le64_to_cpu(uuid_regs.regs[1]), 541 }; 542 memcpy((void *)&args + offsetof(ffa_value_t, a4), data, sizeof(*data)); 543 544 invoke_ffa_fn(args, &ret); 545 546 ffa_msg_send_wait_for_completion(&ret); 547 548 if (ret.a0 == FFA_ERROR) 549 return ffa_to_linux_errno((int)ret.a2); 550 551 if (ret.a0 == FFA_MSG_SEND_DIRECT_RESP2) { 552 memcpy(data, (void *)&ret + offsetof(ffa_value_t, a4), sizeof(*data)); 553 return 0; 554 } 555 556 return -EINVAL; 557} 558 559static int ffa_mem_first_frag(u32 func_id, phys_addr_t buf, u32 buf_sz, 560 u32 frag_len, u32 len, u64 *handle) 561{ 562 ffa_value_t ret; 563 564 invoke_ffa_fn((ffa_value_t){ 565 .a0 = func_id, .a1 = len, .a2 = frag_len, 566 .a3 = buf, .a4 = buf_sz, 567 }, &ret); 568 569 while (ret.a0 == FFA_MEM_OP_PAUSE) 570 invoke_ffa_fn((ffa_value_t){ 571 .a0 = FFA_MEM_OP_RESUME, 572 .a1 = ret.a1, .a2 = ret.a2, 573 }, &ret); 574 575 if (ret.a0 == FFA_ERROR) 576 return ffa_to_linux_errno((int)ret.a2); 577 578 if (ret.a0 == FFA_SUCCESS) { 579 if (handle) 580 *handle = PACK_HANDLE(ret.a2, ret.a3); 581 } else if (ret.a0 == FFA_MEM_FRAG_RX) { 582 if (handle) 583 *handle = PACK_HANDLE(ret.a1, ret.a2); 584 } else { 585 return -EOPNOTSUPP; 586 } 587 588 return frag_len; 589} 590 591static int ffa_mem_next_frag(u64 handle, u32 frag_len) 592{ 593 ffa_value_t ret; 594 595 invoke_ffa_fn((ffa_value_t){ 596 .a0 = FFA_MEM_FRAG_TX, 597 .a1 = HANDLE_LOW(handle), .a2 = HANDLE_HIGH(handle), 598 .a3 = frag_len, 599 }, &ret); 600 601 while (ret.a0 == FFA_MEM_OP_PAUSE) 602 invoke_ffa_fn((ffa_value_t){ 603 .a0 = FFA_MEM_OP_RESUME, 604 .a1 = ret.a1, .a2 = ret.a2, 605 }, &ret); 606 607 if (ret.a0 == FFA_ERROR) 608 return ffa_to_linux_errno((int)ret.a2); 609 610 if (ret.a0 == FFA_MEM_FRAG_RX) 611 return ret.a3; 612 else if (ret.a0 == FFA_SUCCESS) 613 return 0; 614 615 return -EOPNOTSUPP; 616} 617 618static int 619ffa_transmit_fragment(u32 func_id, phys_addr_t buf, u32 buf_sz, u32 frag_len, 620 u32 len, u64 *handle, bool first) 621{ 622 if (!first) 623 return ffa_mem_next_frag(*handle, frag_len); 624 625 return ffa_mem_first_frag(func_id, buf, buf_sz, frag_len, len, handle); 626} 627 628static u32 ffa_get_num_pages_sg(struct scatterlist *sg) 629{ 630 u32 num_pages = 0; 631 632 do { 633 num_pages += sg->length / FFA_PAGE_SIZE; 634 } while ((sg = sg_next(sg))); 635 636 return num_pages; 637} 638 639static u16 ffa_memory_attributes_get(u32 func_id) 640{ 641 /* 642 * For the memory lend or donate operation, if the receiver is a PE or 643 * a proxy endpoint, the owner/sender must not specify the attributes 644 */ 645 if (func_id == FFA_FN_NATIVE(MEM_LEND) || 646 func_id == FFA_MEM_LEND) 647 return 0; 648 649 return FFA_MEM_NORMAL | FFA_MEM_WRITE_BACK | FFA_MEM_INNER_SHAREABLE; 650} 651 652static void ffa_emad_impdef_value_init(u32 version, void *dst, void *src) 653{ 654 struct ffa_mem_region_attributes *ep_mem_access; 655 656 if (FFA_EMAD_HAS_IMPDEF_FIELD(version)) 657 memcpy(dst, src, sizeof(ep_mem_access->impdef_val)); 658} 659 660static void 661ffa_mem_region_additional_setup(u32 version, struct ffa_mem_region *mem_region) 662{ 663 if (!FFA_MEM_REGION_HAS_EP_MEM_OFFSET(version)) { 664 mem_region->ep_mem_size = 0; 665 } else { 666 mem_region->ep_mem_size = ffa_emad_size_get(version); 667 mem_region->ep_mem_offset = sizeof(*mem_region); 668 memset(mem_region->reserved, 0, 12); 669 } 670} 671 672static int 673ffa_setup_and_transmit(u32 func_id, void *buffer, u32 max_fragsize, 674 struct ffa_mem_ops_args *args) 675{ 676 int rc = 0; 677 bool first = true; 678 u32 composite_offset; 679 phys_addr_t addr = 0; 680 struct ffa_mem_region *mem_region = buffer; 681 struct ffa_composite_mem_region *composite; 682 struct ffa_mem_region_addr_range *constituents; 683 struct ffa_mem_region_attributes *ep_mem_access; 684 u32 idx, frag_len, length, buf_sz = 0, num_entries = sg_nents(args->sg); 685 686 mem_region->tag = args->tag; 687 mem_region->flags = args->flags; 688 mem_region->sender_id = drv_info->vm_id; 689 mem_region->attributes = ffa_memory_attributes_get(func_id); 690 composite_offset = ffa_mem_desc_offset(buffer, args->nattrs, 691 drv_info->version); 692 693 for (idx = 0; idx < args->nattrs; idx++) { 694 ep_mem_access = buffer + 695 ffa_mem_desc_offset(buffer, idx, drv_info->version); 696 ep_mem_access->receiver = args->attrs[idx].receiver; 697 ep_mem_access->attrs = args->attrs[idx].attrs; 698 ep_mem_access->composite_off = composite_offset; 699 ep_mem_access->flag = 0; 700 ep_mem_access->reserved = 0; 701 ffa_emad_impdef_value_init(drv_info->version, 702 ep_mem_access->impdef_val, 703 args->attrs[idx].impdef_val); 704 } 705 mem_region->handle = 0; 706 mem_region->ep_count = args->nattrs; 707 ffa_mem_region_additional_setup(drv_info->version, mem_region); 708 709 composite = buffer + composite_offset; 710 composite->total_pg_cnt = ffa_get_num_pages_sg(args->sg); 711 composite->addr_range_cnt = num_entries; 712 composite->reserved = 0; 713 714 length = composite_offset + CONSTITUENTS_OFFSET(num_entries); 715 frag_len = composite_offset + CONSTITUENTS_OFFSET(0); 716 if (frag_len > max_fragsize) 717 return -ENXIO; 718 719 if (!args->use_txbuf) { 720 addr = virt_to_phys(buffer); 721 buf_sz = max_fragsize / FFA_PAGE_SIZE; 722 } 723 724 constituents = buffer + frag_len; 725 idx = 0; 726 do { 727 if (frag_len == max_fragsize) { 728 rc = ffa_transmit_fragment(func_id, addr, buf_sz, 729 frag_len, length, 730 &args->g_handle, first); 731 if (rc < 0) 732 return -ENXIO; 733 734 first = false; 735 idx = 0; 736 frag_len = 0; 737 constituents = buffer; 738 } 739 740 if ((void *)constituents - buffer > max_fragsize) { 741 pr_err("Memory Region Fragment > Tx Buffer size\n"); 742 return -EFAULT; 743 } 744 745 constituents->address = sg_phys(args->sg); 746 constituents->pg_cnt = args->sg->length / FFA_PAGE_SIZE; 747 constituents->reserved = 0; 748 constituents++; 749 frag_len += sizeof(struct ffa_mem_region_addr_range); 750 } while ((args->sg = sg_next(args->sg))); 751 752 return ffa_transmit_fragment(func_id, addr, buf_sz, frag_len, 753 length, &args->g_handle, first); 754} 755 756static int ffa_memory_ops(u32 func_id, struct ffa_mem_ops_args *args) 757{ 758 int ret; 759 void *buffer; 760 size_t rxtx_bufsz = drv_info->rxtx_bufsz; 761 762 if (!args->use_txbuf) { 763 buffer = alloc_pages_exact(rxtx_bufsz, GFP_KERNEL); 764 if (!buffer) 765 return -ENOMEM; 766 } else { 767 buffer = drv_info->tx_buffer; 768 mutex_lock(&drv_info->tx_lock); 769 } 770 771 ret = ffa_setup_and_transmit(func_id, buffer, rxtx_bufsz, args); 772 773 if (args->use_txbuf) 774 mutex_unlock(&drv_info->tx_lock); 775 else 776 free_pages_exact(buffer, rxtx_bufsz); 777 778 return ret < 0 ? ret : 0; 779} 780 781static int ffa_memory_reclaim(u64 g_handle, u32 flags) 782{ 783 ffa_value_t ret; 784 785 invoke_ffa_fn((ffa_value_t){ 786 .a0 = FFA_MEM_RECLAIM, 787 .a1 = HANDLE_LOW(g_handle), .a2 = HANDLE_HIGH(g_handle), 788 .a3 = flags, 789 }, &ret); 790 791 if (ret.a0 == FFA_ERROR) 792 return ffa_to_linux_errno((int)ret.a2); 793 794 return 0; 795} 796 797static int ffa_notification_bitmap_create(void) 798{ 799 ffa_value_t ret; 800 u16 vcpu_count = nr_cpu_ids; 801 802 invoke_ffa_fn((ffa_value_t){ 803 .a0 = FFA_NOTIFICATION_BITMAP_CREATE, 804 .a1 = drv_info->vm_id, .a2 = vcpu_count, 805 }, &ret); 806 807 if (ret.a0 == FFA_ERROR) 808 return ffa_to_linux_errno((int)ret.a2); 809 810 return 0; 811} 812 813static int ffa_notification_bitmap_destroy(void) 814{ 815 ffa_value_t ret; 816 817 invoke_ffa_fn((ffa_value_t){ 818 .a0 = FFA_NOTIFICATION_BITMAP_DESTROY, 819 .a1 = drv_info->vm_id, 820 }, &ret); 821 822 if (ret.a0 == FFA_ERROR) 823 return ffa_to_linux_errno((int)ret.a2); 824 825 return 0; 826} 827 828enum notify_type { 829 SECURE_PARTITION, 830 NON_SECURE_VM, 831 SPM_FRAMEWORK, 832 NS_HYP_FRAMEWORK, 833}; 834 835#define NOTIFICATION_LOW_MASK GENMASK(31, 0) 836#define NOTIFICATION_HIGH_MASK GENMASK(63, 32) 837#define NOTIFICATION_BITMAP_HIGH(x) \ 838 ((u32)(FIELD_GET(NOTIFICATION_HIGH_MASK, (x)))) 839#define NOTIFICATION_BITMAP_LOW(x) \ 840 ((u32)(FIELD_GET(NOTIFICATION_LOW_MASK, (x)))) 841#define PACK_NOTIFICATION_BITMAP(low, high) \ 842 (FIELD_PREP(NOTIFICATION_LOW_MASK, (low)) | \ 843 FIELD_PREP(NOTIFICATION_HIGH_MASK, (high))) 844 845#define RECEIVER_VCPU_MASK GENMASK(31, 16) 846#define PACK_NOTIFICATION_GET_RECEIVER_INFO(vcpu_r, r) \ 847 (FIELD_PREP(RECEIVER_VCPU_MASK, (vcpu_r)) | \ 848 FIELD_PREP(RECEIVER_ID_MASK, (r))) 849 850#define NOTIFICATION_INFO_GET_MORE_PEND_MASK BIT(0) 851#define NOTIFICATION_INFO_GET_ID_COUNT GENMASK(11, 7) 852#define ID_LIST_MASK_64 GENMASK(51, 12) 853#define ID_LIST_MASK_32 GENMASK(31, 12) 854#define MAX_IDS_64 20 855#define MAX_IDS_32 10 856 857#define PER_VCPU_NOTIFICATION_FLAG BIT(0) 858#define SECURE_PARTITION_BITMAP_ENABLE BIT(SECURE_PARTITION) 859#define NON_SECURE_VM_BITMAP_ENABLE BIT(NON_SECURE_VM) 860#define SPM_FRAMEWORK_BITMAP_ENABLE BIT(SPM_FRAMEWORK) 861#define NS_HYP_FRAMEWORK_BITMAP_ENABLE BIT(NS_HYP_FRAMEWORK) 862#define FFA_BITMAP_SECURE_ENABLE_MASK \ 863 (SECURE_PARTITION_BITMAP_ENABLE | SPM_FRAMEWORK_BITMAP_ENABLE) 864#define FFA_BITMAP_NS_ENABLE_MASK \ 865 (NON_SECURE_VM_BITMAP_ENABLE | NS_HYP_FRAMEWORK_BITMAP_ENABLE) 866#define FFA_BITMAP_ALL_ENABLE_MASK \ 867 (FFA_BITMAP_SECURE_ENABLE_MASK | FFA_BITMAP_NS_ENABLE_MASK) 868 869#define FFA_SECURE_PARTITION_ID_FLAG BIT(15) 870 871#define SPM_FRAMEWORK_BITMAP(x) NOTIFICATION_BITMAP_LOW(x) 872#define NS_HYP_FRAMEWORK_BITMAP(x) NOTIFICATION_BITMAP_HIGH(x) 873#define FRAMEWORK_NOTIFY_RX_BUFFER_FULL BIT(0) 874 875static int ffa_notification_bind_common(u16 dst_id, u64 bitmap, 876 u32 flags, bool is_bind) 877{ 878 ffa_value_t ret; 879 u32 func, src_dst_ids = PACK_TARGET_INFO(dst_id, drv_info->vm_id); 880 881 func = is_bind ? FFA_NOTIFICATION_BIND : FFA_NOTIFICATION_UNBIND; 882 883 invoke_ffa_fn((ffa_value_t){ 884 .a0 = func, .a1 = src_dst_ids, .a2 = flags, 885 .a3 = NOTIFICATION_BITMAP_LOW(bitmap), 886 .a4 = NOTIFICATION_BITMAP_HIGH(bitmap), 887 }, &ret); 888 889 if (ret.a0 == FFA_ERROR) 890 return ffa_to_linux_errno((int)ret.a2); 891 else if (ret.a0 != FFA_SUCCESS) 892 return -EINVAL; 893 894 return 0; 895} 896 897static 898int ffa_notification_set(u16 src_id, u16 dst_id, u32 flags, u64 bitmap) 899{ 900 ffa_value_t ret; 901 u32 src_dst_ids = PACK_TARGET_INFO(dst_id, src_id); 902 903 invoke_ffa_fn((ffa_value_t) { 904 .a0 = FFA_NOTIFICATION_SET, .a1 = src_dst_ids, .a2 = flags, 905 .a3 = NOTIFICATION_BITMAP_LOW(bitmap), 906 .a4 = NOTIFICATION_BITMAP_HIGH(bitmap), 907 }, &ret); 908 909 if (ret.a0 == FFA_ERROR) 910 return ffa_to_linux_errno((int)ret.a2); 911 else if (ret.a0 != FFA_SUCCESS) 912 return -EINVAL; 913 914 return 0; 915} 916 917struct ffa_notify_bitmaps { 918 u64 sp_map; 919 u64 vm_map; 920 u64 arch_map; 921}; 922 923static int ffa_notification_get(u32 flags, struct ffa_notify_bitmaps *notify) 924{ 925 ffa_value_t ret; 926 u16 src_id = drv_info->vm_id; 927 u16 cpu_id = smp_processor_id(); 928 u32 rec_vcpu_ids = PACK_NOTIFICATION_GET_RECEIVER_INFO(cpu_id, src_id); 929 930 invoke_ffa_fn((ffa_value_t){ 931 .a0 = FFA_NOTIFICATION_GET, .a1 = rec_vcpu_ids, .a2 = flags, 932 }, &ret); 933 934 if (ret.a0 == FFA_ERROR) 935 return ffa_to_linux_errno((int)ret.a2); 936 else if (ret.a0 != FFA_SUCCESS) 937 return -EINVAL; /* Something else went wrong. */ 938 939 if (flags & SECURE_PARTITION_BITMAP_ENABLE) 940 notify->sp_map = PACK_NOTIFICATION_BITMAP(ret.a2, ret.a3); 941 if (flags & NON_SECURE_VM_BITMAP_ENABLE) 942 notify->vm_map = PACK_NOTIFICATION_BITMAP(ret.a4, ret.a5); 943 if (flags & SPM_FRAMEWORK_BITMAP_ENABLE) 944 notify->arch_map = SPM_FRAMEWORK_BITMAP(ret.a6); 945 if (flags & NS_HYP_FRAMEWORK_BITMAP_ENABLE) 946 notify->arch_map = PACK_NOTIFICATION_BITMAP(notify->arch_map, 947 ret.a7); 948 949 return 0; 950} 951 952struct ffa_dev_part_info { 953 ffa_sched_recv_cb callback; 954 void *cb_data; 955 rwlock_t rw_lock; 956 struct ffa_device *dev; 957 struct list_head node; 958}; 959 960static void __do_sched_recv_cb(u16 part_id, u16 vcpu, bool is_per_vcpu) 961{ 962 struct ffa_dev_part_info *partition = NULL, *tmp; 963 ffa_sched_recv_cb callback; 964 struct list_head *phead; 965 void *cb_data; 966 967 phead = xa_load(&drv_info->partition_info, part_id); 968 if (!phead) { 969 pr_err("%s: Invalid partition ID 0x%x\n", __func__, part_id); 970 return; 971 } 972 973 list_for_each_entry_safe(partition, tmp, phead, node) { 974 read_lock(&partition->rw_lock); 975 callback = partition->callback; 976 cb_data = partition->cb_data; 977 read_unlock(&partition->rw_lock); 978 979 if (callback) 980 callback(vcpu, is_per_vcpu, cb_data); 981 } 982} 983 984/* 985 * Map logical ID index to the u16 index within the packed ID list. 986 * 987 * For native responses (FF-A width == kernel word size), IDs are 988 * tightly packed: idx -> idx. 989 * 990 * For 32-bit responses on a 64-bit kernel, each 64-bit register 991 * contributes 4 x u16 values but only the lower 2 are defined; the 992 * upper 2 are garbage. This mapping skips those upper halves: 993 * 0,1,2,3,4,5,... -> 0,1,4,5,8,9,... 994 */ 995static int list_idx_to_u16_idx(int idx, bool is_native_resp) 996{ 997 return is_native_resp ? idx : idx + 2 * (idx >> 1); 998} 999 1000static void ffa_notification_info_get(void) 1001{ 1002 int ids_processed, ids_count[MAX_IDS_64]; 1003 int idx, list, max_ids, lists_cnt; 1004 bool is_64b_resp, is_native_resp; 1005 ffa_value_t ret; 1006 u64 id_list; 1007 1008 do { 1009 invoke_ffa_fn((ffa_value_t){ 1010 .a0 = FFA_FN_NATIVE(NOTIFICATION_INFO_GET), 1011 }, &ret); 1012 1013 if (ret.a0 != FFA_FN_NATIVE(SUCCESS) && ret.a0 != FFA_SUCCESS) { 1014 if ((s32)ret.a2 != FFA_RET_NO_DATA) 1015 pr_err("Notification Info fetch failed: 0x%lx (0x%lx)", 1016 ret.a0, ret.a2); 1017 return; 1018 } 1019 1020 is_64b_resp = (ret.a0 == FFA_FN64_SUCCESS); 1021 is_native_resp = (ret.a0 == FFA_FN_NATIVE(SUCCESS)); 1022 1023 ids_processed = 0; 1024 lists_cnt = FIELD_GET(NOTIFICATION_INFO_GET_ID_COUNT, ret.a2); 1025 if (is_64b_resp) { 1026 max_ids = MAX_IDS_64; 1027 id_list = FIELD_GET(ID_LIST_MASK_64, ret.a2); 1028 } else { 1029 max_ids = MAX_IDS_32; 1030 id_list = FIELD_GET(ID_LIST_MASK_32, ret.a2); 1031 } 1032 1033 for (idx = 0; idx < lists_cnt; idx++, id_list >>= 2) 1034 ids_count[idx] = (id_list & 0x3) + 1; 1035 1036 /* Process IDs */ 1037 for (list = 0; list < lists_cnt; list++) { 1038 int u16_idx; 1039 u16 vcpu_id, part_id, *packed_id_list = (u16 *)&ret.a3; 1040 1041 if (ids_processed >= max_ids - 1) 1042 break; 1043 1044 u16_idx = list_idx_to_u16_idx(ids_processed, 1045 is_native_resp); 1046 part_id = packed_id_list[u16_idx]; 1047 ids_processed++; 1048 1049 if (ids_count[list] == 1) { /* Global Notification */ 1050 __do_sched_recv_cb(part_id, 0, false); 1051 continue; 1052 } 1053 1054 /* Per vCPU Notification */ 1055 for (idx = 1; idx < ids_count[list]; idx++) { 1056 if (ids_processed >= max_ids - 1) 1057 break; 1058 1059 u16_idx = list_idx_to_u16_idx(ids_processed, 1060 is_native_resp); 1061 vcpu_id = packed_id_list[u16_idx]; 1062 ids_processed++; 1063 1064 __do_sched_recv_cb(part_id, vcpu_id, true); 1065 } 1066 } 1067 } while (ret.a2 & NOTIFICATION_INFO_GET_MORE_PEND_MASK); 1068} 1069 1070static int ffa_run(struct ffa_device *dev, u16 vcpu) 1071{ 1072 ffa_value_t ret; 1073 u32 target = dev->vm_id << 16 | vcpu; 1074 1075 invoke_ffa_fn((ffa_value_t){ .a0 = FFA_RUN, .a1 = target, }, &ret); 1076 1077 while (ret.a0 == FFA_INTERRUPT) 1078 invoke_ffa_fn((ffa_value_t){ .a0 = FFA_RUN, .a1 = ret.a1, }, 1079 &ret); 1080 1081 if (ret.a0 == FFA_ERROR) 1082 return ffa_to_linux_errno((int)ret.a2); 1083 1084 return 0; 1085} 1086 1087static void ffa_drvinfo_flags_init(void) 1088{ 1089 if (!ffa_features(FFA_FN_NATIVE(MEM_LEND), 0, NULL, NULL) || 1090 !ffa_features(FFA_FN_NATIVE(MEM_SHARE), 0, NULL, NULL)) 1091 drv_info->mem_ops_native = true; 1092 1093 if (!ffa_features(FFA_MSG_SEND_DIRECT_REQ2, 0, NULL, NULL) || 1094 !ffa_features(FFA_MSG_SEND_DIRECT_RESP2, 0, NULL, NULL)) 1095 drv_info->msg_direct_req2_supp = true; 1096} 1097 1098static u32 ffa_api_version_get(void) 1099{ 1100 return drv_info->version; 1101} 1102 1103static int ffa_partition_info_get(const char *uuid_str, 1104 struct ffa_partition_info *buffer) 1105{ 1106 int count; 1107 uuid_t uuid; 1108 struct ffa_partition_info *pbuf; 1109 1110 if (uuid_parse(uuid_str, &uuid)) { 1111 pr_err("invalid uuid (%s)\n", uuid_str); 1112 return -ENODEV; 1113 } 1114 1115 count = ffa_partition_probe(&uuid, &pbuf); 1116 if (count <= 0) 1117 return -ENOENT; 1118 1119 memcpy(buffer, pbuf, sizeof(*pbuf) * count); 1120 kfree(pbuf); 1121 return 0; 1122} 1123 1124static void ffa_mode_32bit_set(struct ffa_device *dev) 1125{ 1126 dev->mode_32bit = true; 1127} 1128 1129static int ffa_sync_send_receive(struct ffa_device *dev, 1130 struct ffa_send_direct_data *data) 1131{ 1132 return ffa_msg_send_direct_req(drv_info->vm_id, dev->vm_id, 1133 dev->mode_32bit, data); 1134} 1135 1136static int ffa_indirect_msg_send(struct ffa_device *dev, void *buf, size_t sz) 1137{ 1138 return ffa_msg_send2(dev, drv_info->vm_id, buf, sz); 1139} 1140 1141static int ffa_sync_send_receive2(struct ffa_device *dev, 1142 struct ffa_send_direct_data2 *data) 1143{ 1144 if (!drv_info->msg_direct_req2_supp) 1145 return -EOPNOTSUPP; 1146 1147 return ffa_msg_send_direct_req2(drv_info->vm_id, dev->vm_id, 1148 &dev->uuid, data); 1149} 1150 1151static int ffa_memory_share(struct ffa_mem_ops_args *args) 1152{ 1153 if (drv_info->mem_ops_native) 1154 return ffa_memory_ops(FFA_FN_NATIVE(MEM_SHARE), args); 1155 1156 return ffa_memory_ops(FFA_MEM_SHARE, args); 1157} 1158 1159static int ffa_memory_lend(struct ffa_mem_ops_args *args) 1160{ 1161 /* Note that upon a successful MEM_LEND request the caller 1162 * must ensure that the memory region specified is not accessed 1163 * until a successful MEM_RECALIM call has been made. 1164 * On systems with a hypervisor present this will been enforced, 1165 * however on systems without a hypervisor the responsibility 1166 * falls to the calling kernel driver to prevent access. 1167 */ 1168 if (drv_info->mem_ops_native) 1169 return ffa_memory_ops(FFA_FN_NATIVE(MEM_LEND), args); 1170 1171 return ffa_memory_ops(FFA_MEM_LEND, args); 1172} 1173 1174#define ffa_notifications_disabled() (!drv_info->notif_enabled) 1175 1176struct notifier_cb_info { 1177 struct hlist_node hnode; 1178 struct ffa_device *dev; 1179 ffa_fwk_notifier_cb fwk_cb; 1180 ffa_notifier_cb cb; 1181 void *cb_data; 1182}; 1183 1184static int 1185ffa_sched_recv_cb_update(struct ffa_device *dev, ffa_sched_recv_cb callback, 1186 void *cb_data, bool is_registration) 1187{ 1188 struct ffa_dev_part_info *partition = NULL, *tmp; 1189 struct list_head *phead; 1190 bool cb_valid; 1191 1192 if (ffa_notifications_disabled()) 1193 return -EOPNOTSUPP; 1194 1195 phead = xa_load(&drv_info->partition_info, dev->vm_id); 1196 if (!phead) { 1197 pr_err("%s: Invalid partition ID 0x%x\n", __func__, dev->vm_id); 1198 return -EINVAL; 1199 } 1200 1201 list_for_each_entry_safe(partition, tmp, phead, node) 1202 if (partition->dev == dev) 1203 break; 1204 1205 if (!partition) { 1206 pr_err("%s: No such partition ID 0x%x\n", __func__, dev->vm_id); 1207 return -EINVAL; 1208 } 1209 1210 write_lock(&partition->rw_lock); 1211 1212 cb_valid = !!partition->callback; 1213 if (!(is_registration ^ cb_valid)) { 1214 write_unlock(&partition->rw_lock); 1215 return -EINVAL; 1216 } 1217 1218 partition->callback = callback; 1219 partition->cb_data = cb_data; 1220 1221 write_unlock(&partition->rw_lock); 1222 return 0; 1223} 1224 1225static int ffa_sched_recv_cb_register(struct ffa_device *dev, 1226 ffa_sched_recv_cb cb, void *cb_data) 1227{ 1228 return ffa_sched_recv_cb_update(dev, cb, cb_data, true); 1229} 1230 1231static int ffa_sched_recv_cb_unregister(struct ffa_device *dev) 1232{ 1233 return ffa_sched_recv_cb_update(dev, NULL, NULL, false); 1234} 1235 1236static int ffa_notification_bind(u16 dst_id, u64 bitmap, u32 flags) 1237{ 1238 return ffa_notification_bind_common(dst_id, bitmap, flags, true); 1239} 1240 1241static int ffa_notification_unbind(u16 dst_id, u64 bitmap) 1242{ 1243 return ffa_notification_bind_common(dst_id, bitmap, 0, false); 1244} 1245 1246static enum notify_type ffa_notify_type_get(u16 vm_id) 1247{ 1248 if (vm_id & FFA_SECURE_PARTITION_ID_FLAG) 1249 return SECURE_PARTITION; 1250 else 1251 return NON_SECURE_VM; 1252} 1253 1254/* notifier_hnode_get* should be called with notify_lock held */ 1255static struct notifier_cb_info * 1256notifier_hnode_get_by_vmid(u16 notify_id, int vmid) 1257{ 1258 struct notifier_cb_info *node; 1259 1260 hash_for_each_possible(drv_info->notifier_hash, node, hnode, notify_id) 1261 if (node->fwk_cb && vmid == node->dev->vm_id) 1262 return node; 1263 1264 return NULL; 1265} 1266 1267static struct notifier_cb_info * 1268notifier_hnode_get_by_vmid_uuid(u16 notify_id, int vmid, const uuid_t *uuid) 1269{ 1270 struct notifier_cb_info *node; 1271 1272 if (uuid_is_null(uuid)) 1273 return notifier_hnode_get_by_vmid(notify_id, vmid); 1274 1275 hash_for_each_possible(drv_info->notifier_hash, node, hnode, notify_id) 1276 if (node->fwk_cb && vmid == node->dev->vm_id && 1277 uuid_equal(&node->dev->uuid, uuid)) 1278 return node; 1279 1280 return NULL; 1281} 1282 1283static struct notifier_cb_info * 1284notifier_hnode_get_by_type(u16 notify_id, enum notify_type type) 1285{ 1286 struct notifier_cb_info *node; 1287 1288 hash_for_each_possible(drv_info->notifier_hash, node, hnode, notify_id) 1289 if (node->cb && type == ffa_notify_type_get(node->dev->vm_id)) 1290 return node; 1291 1292 return NULL; 1293} 1294 1295static int update_notifier_cb(struct ffa_device *dev, int notify_id, 1296 struct notifier_cb_info *cb, bool is_framework) 1297{ 1298 struct notifier_cb_info *cb_info = NULL; 1299 enum notify_type type = ffa_notify_type_get(dev->vm_id); 1300 bool cb_found, is_registration = !!cb; 1301 1302 if (is_framework) 1303 cb_info = notifier_hnode_get_by_vmid_uuid(notify_id, dev->vm_id, 1304 &dev->uuid); 1305 else 1306 cb_info = notifier_hnode_get_by_type(notify_id, type); 1307 1308 cb_found = !!cb_info; 1309 1310 if (!(is_registration ^ cb_found)) 1311 return -EINVAL; 1312 1313 if (is_registration) { 1314 hash_add(drv_info->notifier_hash, &cb->hnode, notify_id); 1315 } else { 1316 hash_del(&cb_info->hnode); 1317 kfree(cb_info); 1318 } 1319 1320 return 0; 1321} 1322 1323static int __ffa_notify_relinquish(struct ffa_device *dev, int notify_id, 1324 bool is_framework) 1325{ 1326 int rc; 1327 1328 if (ffa_notifications_disabled()) 1329 return -EOPNOTSUPP; 1330 1331 if (notify_id >= FFA_MAX_NOTIFICATIONS) 1332 return -EINVAL; 1333 1334 write_lock(&drv_info->notify_lock); 1335 1336 rc = update_notifier_cb(dev, notify_id, NULL, is_framework); 1337 if (rc) { 1338 pr_err("Could not unregister notification callback\n"); 1339 write_unlock(&drv_info->notify_lock); 1340 return rc; 1341 } 1342 1343 if (!is_framework) 1344 rc = ffa_notification_unbind(dev->vm_id, BIT(notify_id)); 1345 1346 write_unlock(&drv_info->notify_lock); 1347 1348 return rc; 1349} 1350 1351static int ffa_notify_relinquish(struct ffa_device *dev, int notify_id) 1352{ 1353 return __ffa_notify_relinquish(dev, notify_id, false); 1354} 1355 1356static int ffa_fwk_notify_relinquish(struct ffa_device *dev, int notify_id) 1357{ 1358 return __ffa_notify_relinquish(dev, notify_id, true); 1359} 1360 1361static int __ffa_notify_request(struct ffa_device *dev, bool is_per_vcpu, 1362 void *cb, void *cb_data, 1363 int notify_id, bool is_framework) 1364{ 1365 int rc; 1366 u32 flags = 0; 1367 struct notifier_cb_info *cb_info = NULL; 1368 1369 if (ffa_notifications_disabled()) 1370 return -EOPNOTSUPP; 1371 1372 if (notify_id >= FFA_MAX_NOTIFICATIONS) 1373 return -EINVAL; 1374 1375 cb_info = kzalloc(sizeof(*cb_info), GFP_KERNEL); 1376 if (!cb_info) 1377 return -ENOMEM; 1378 1379 cb_info->dev = dev; 1380 cb_info->cb_data = cb_data; 1381 if (is_framework) 1382 cb_info->fwk_cb = cb; 1383 else 1384 cb_info->cb = cb; 1385 1386 write_lock(&drv_info->notify_lock); 1387 1388 if (!is_framework) { 1389 if (is_per_vcpu) 1390 flags = PER_VCPU_NOTIFICATION_FLAG; 1391 1392 rc = ffa_notification_bind(dev->vm_id, BIT(notify_id), flags); 1393 if (rc) 1394 goto out_unlock_free; 1395 } 1396 1397 rc = update_notifier_cb(dev, notify_id, cb_info, is_framework); 1398 if (rc) { 1399 pr_err("Failed to register callback for %d - %d\n", 1400 notify_id, rc); 1401 if (!is_framework) 1402 ffa_notification_unbind(dev->vm_id, BIT(notify_id)); 1403 } 1404 1405out_unlock_free: 1406 write_unlock(&drv_info->notify_lock); 1407 if (rc) 1408 kfree(cb_info); 1409 1410 return rc; 1411} 1412 1413static int ffa_notify_request(struct ffa_device *dev, bool is_per_vcpu, 1414 ffa_notifier_cb cb, void *cb_data, int notify_id) 1415{ 1416 return __ffa_notify_request(dev, is_per_vcpu, cb, cb_data, notify_id, 1417 false); 1418} 1419 1420static int 1421ffa_fwk_notify_request(struct ffa_device *dev, ffa_fwk_notifier_cb cb, 1422 void *cb_data, int notify_id) 1423{ 1424 return __ffa_notify_request(dev, false, cb, cb_data, notify_id, true); 1425} 1426 1427static int ffa_notify_send(struct ffa_device *dev, int notify_id, 1428 bool is_per_vcpu, u16 vcpu) 1429{ 1430 u32 flags = 0; 1431 1432 if (ffa_notifications_disabled()) 1433 return -EOPNOTSUPP; 1434 1435 if (is_per_vcpu) 1436 flags |= (PER_VCPU_NOTIFICATION_FLAG | vcpu << 16); 1437 1438 return ffa_notification_set(dev->vm_id, drv_info->vm_id, flags, 1439 BIT(notify_id)); 1440} 1441 1442static void handle_notif_callbacks(u64 bitmap, enum notify_type type) 1443{ 1444 int notify_id; 1445 struct notifier_cb_info *cb_info = NULL; 1446 1447 for (notify_id = 0; notify_id <= FFA_MAX_NOTIFICATIONS && bitmap; 1448 notify_id++, bitmap >>= 1) { 1449 if (!(bitmap & 1)) 1450 continue; 1451 1452 read_lock(&drv_info->notify_lock); 1453 cb_info = notifier_hnode_get_by_type(notify_id, type); 1454 read_unlock(&drv_info->notify_lock); 1455 1456 if (cb_info && cb_info->cb) 1457 cb_info->cb(notify_id, cb_info->cb_data); 1458 } 1459} 1460 1461static void handle_fwk_notif_callbacks(u32 bitmap) 1462{ 1463 void *buf; 1464 uuid_t uuid; 1465 int notify_id = 0, target; 1466 struct ffa_indirect_msg_hdr *msg; 1467 struct notifier_cb_info *cb_info = NULL; 1468 1469 /* Only one framework notification defined and supported for now */ 1470 if (!(bitmap & FRAMEWORK_NOTIFY_RX_BUFFER_FULL)) 1471 return; 1472 1473 mutex_lock(&drv_info->rx_lock); 1474 1475 msg = drv_info->rx_buffer; 1476 buf = kmemdup((void *)msg + msg->offset, msg->size, GFP_KERNEL); 1477 if (!buf) { 1478 mutex_unlock(&drv_info->rx_lock); 1479 return; 1480 } 1481 1482 target = SENDER_ID(msg->send_recv_id); 1483 if (msg->offset >= sizeof(*msg)) 1484 uuid_copy(&uuid, &msg->uuid); 1485 else 1486 uuid_copy(&uuid, &uuid_null); 1487 1488 mutex_unlock(&drv_info->rx_lock); 1489 1490 ffa_rx_release(); 1491 1492 read_lock(&drv_info->notify_lock); 1493 cb_info = notifier_hnode_get_by_vmid_uuid(notify_id, target, &uuid); 1494 read_unlock(&drv_info->notify_lock); 1495 1496 if (cb_info && cb_info->fwk_cb) 1497 cb_info->fwk_cb(notify_id, cb_info->cb_data, buf); 1498 kfree(buf); 1499} 1500 1501static void notif_get_and_handle(void *cb_data) 1502{ 1503 int rc; 1504 u32 flags; 1505 struct ffa_drv_info *info = cb_data; 1506 struct ffa_notify_bitmaps bitmaps = { 0 }; 1507 1508 if (info->vm_id == 0) /* Non secure physical instance */ 1509 flags = FFA_BITMAP_SECURE_ENABLE_MASK; 1510 else 1511 flags = FFA_BITMAP_ALL_ENABLE_MASK; 1512 1513 rc = ffa_notification_get(flags, &bitmaps); 1514 if (rc) { 1515 pr_err("Failed to retrieve notifications with %d!\n", rc); 1516 return; 1517 } 1518 1519 handle_fwk_notif_callbacks(SPM_FRAMEWORK_BITMAP(bitmaps.arch_map)); 1520 handle_fwk_notif_callbacks(NS_HYP_FRAMEWORK_BITMAP(bitmaps.arch_map)); 1521 handle_notif_callbacks(bitmaps.vm_map, NON_SECURE_VM); 1522 handle_notif_callbacks(bitmaps.sp_map, SECURE_PARTITION); 1523} 1524 1525static void 1526ffa_self_notif_handle(u16 vcpu, bool is_per_vcpu, void *cb_data) 1527{ 1528 struct ffa_drv_info *info = cb_data; 1529 1530 if (!is_per_vcpu) 1531 notif_get_and_handle(info); 1532 else 1533 smp_call_function_single(vcpu, notif_get_and_handle, info, 0); 1534} 1535 1536static void notif_pcpu_irq_work_fn(struct work_struct *work) 1537{ 1538 struct ffa_drv_info *info = container_of(work, struct ffa_drv_info, 1539 notif_pcpu_work); 1540 1541 ffa_self_notif_handle(smp_processor_id(), true, info); 1542} 1543 1544static const struct ffa_info_ops ffa_drv_info_ops = { 1545 .api_version_get = ffa_api_version_get, 1546 .partition_info_get = ffa_partition_info_get, 1547}; 1548 1549static const struct ffa_msg_ops ffa_drv_msg_ops = { 1550 .mode_32bit_set = ffa_mode_32bit_set, 1551 .sync_send_receive = ffa_sync_send_receive, 1552 .indirect_send = ffa_indirect_msg_send, 1553 .sync_send_receive2 = ffa_sync_send_receive2, 1554}; 1555 1556static const struct ffa_mem_ops ffa_drv_mem_ops = { 1557 .memory_reclaim = ffa_memory_reclaim, 1558 .memory_share = ffa_memory_share, 1559 .memory_lend = ffa_memory_lend, 1560}; 1561 1562static const struct ffa_cpu_ops ffa_drv_cpu_ops = { 1563 .run = ffa_run, 1564}; 1565 1566static const struct ffa_notifier_ops ffa_drv_notifier_ops = { 1567 .sched_recv_cb_register = ffa_sched_recv_cb_register, 1568 .sched_recv_cb_unregister = ffa_sched_recv_cb_unregister, 1569 .notify_request = ffa_notify_request, 1570 .notify_relinquish = ffa_notify_relinquish, 1571 .fwk_notify_request = ffa_fwk_notify_request, 1572 .fwk_notify_relinquish = ffa_fwk_notify_relinquish, 1573 .notify_send = ffa_notify_send, 1574}; 1575 1576static const struct ffa_ops ffa_drv_ops = { 1577 .info_ops = &ffa_drv_info_ops, 1578 .msg_ops = &ffa_drv_msg_ops, 1579 .mem_ops = &ffa_drv_mem_ops, 1580 .cpu_ops = &ffa_drv_cpu_ops, 1581 .notifier_ops = &ffa_drv_notifier_ops, 1582}; 1583 1584void ffa_device_match_uuid(struct ffa_device *ffa_dev, const uuid_t *uuid) 1585{ 1586 int count, idx; 1587 struct ffa_partition_info *pbuf, *tpbuf; 1588 1589 count = ffa_partition_probe(uuid, &pbuf); 1590 if (count <= 0) 1591 return; 1592 1593 for (idx = 0, tpbuf = pbuf; idx < count; idx++, tpbuf++) 1594 if (tpbuf->id == ffa_dev->vm_id) 1595 uuid_copy(&ffa_dev->uuid, uuid); 1596 kfree(pbuf); 1597} 1598 1599static int 1600ffa_bus_notifier(struct notifier_block *nb, unsigned long action, void *data) 1601{ 1602 struct device *dev = data; 1603 struct ffa_device *fdev = to_ffa_dev(dev); 1604 1605 if (action == BUS_NOTIFY_BIND_DRIVER) { 1606 struct ffa_driver *ffa_drv = to_ffa_driver(dev->driver); 1607 const struct ffa_device_id *id_table = ffa_drv->id_table; 1608 1609 /* 1610 * FF-A v1.1 provides UUID for each partition as part of the 1611 * discovery API, the discovered UUID must be populated in the 1612 * device's UUID and there is no need to workaround by copying 1613 * the same from the driver table. 1614 */ 1615 if (uuid_is_null(&fdev->uuid)) 1616 ffa_device_match_uuid(fdev, &id_table->uuid); 1617 1618 return NOTIFY_OK; 1619 } 1620 1621 return NOTIFY_DONE; 1622} 1623 1624static struct notifier_block ffa_bus_nb = { 1625 .notifier_call = ffa_bus_notifier, 1626}; 1627 1628static int ffa_xa_add_partition_info(struct ffa_device *dev) 1629{ 1630 struct ffa_dev_part_info *info; 1631 struct list_head *head, *phead; 1632 int ret = -ENOMEM; 1633 1634 phead = xa_load(&drv_info->partition_info, dev->vm_id); 1635 if (phead) { 1636 head = phead; 1637 list_for_each_entry(info, head, node) { 1638 if (info->dev == dev) { 1639 pr_err("%s: duplicate dev %p part ID 0x%x\n", 1640 __func__, dev, dev->vm_id); 1641 return -EEXIST; 1642 } 1643 } 1644 } 1645 1646 info = kzalloc(sizeof(*info), GFP_KERNEL); 1647 if (!info) 1648 return ret; 1649 1650 rwlock_init(&info->rw_lock); 1651 info->dev = dev; 1652 1653 if (!phead) { 1654 phead = kzalloc(sizeof(*phead), GFP_KERNEL); 1655 if (!phead) 1656 goto free_out; 1657 1658 INIT_LIST_HEAD(phead); 1659 1660 ret = xa_insert(&drv_info->partition_info, dev->vm_id, phead, 1661 GFP_KERNEL); 1662 if (ret) { 1663 pr_err("%s: failed to save part ID 0x%x Ret:%d\n", 1664 __func__, dev->vm_id, ret); 1665 goto free_out; 1666 } 1667 } 1668 list_add(&info->node, phead); 1669 return 0; 1670 1671free_out: 1672 kfree(phead); 1673 kfree(info); 1674 return ret; 1675} 1676 1677static int ffa_setup_host_partition(int vm_id) 1678{ 1679 struct ffa_partition_info buf = { 0 }; 1680 struct ffa_device *ffa_dev; 1681 int ret; 1682 1683 buf.id = vm_id; 1684 ffa_dev = ffa_device_register(&buf, &ffa_drv_ops); 1685 if (!ffa_dev) { 1686 pr_err("%s: failed to register host partition ID 0x%x\n", 1687 __func__, vm_id); 1688 return -EINVAL; 1689 } 1690 1691 ret = ffa_xa_add_partition_info(ffa_dev); 1692 if (ret) 1693 return ret; 1694 1695 if (ffa_notifications_disabled()) 1696 return 0; 1697 1698 ret = ffa_sched_recv_cb_update(ffa_dev, ffa_self_notif_handle, 1699 drv_info, true); 1700 if (ret) 1701 pr_info("Failed to register driver sched callback %d\n", ret); 1702 1703 return ret; 1704} 1705 1706static void ffa_partitions_cleanup(void) 1707{ 1708 struct list_head *phead; 1709 unsigned long idx; 1710 1711 /* Clean up/free all registered devices */ 1712 ffa_devices_unregister(); 1713 1714 xa_for_each(&drv_info->partition_info, idx, phead) { 1715 struct ffa_dev_part_info *info, *tmp; 1716 1717 xa_erase(&drv_info->partition_info, idx); 1718 list_for_each_entry_safe(info, tmp, phead, node) { 1719 list_del(&info->node); 1720 kfree(info); 1721 } 1722 kfree(phead); 1723 } 1724 1725 xa_destroy(&drv_info->partition_info); 1726} 1727 1728static int ffa_setup_partitions(void) 1729{ 1730 int count, idx, ret; 1731 struct ffa_device *ffa_dev; 1732 struct ffa_partition_info *pbuf, *tpbuf; 1733 1734 if (drv_info->version == FFA_VERSION_1_0) { 1735 ret = bus_register_notifier(&ffa_bus_type, &ffa_bus_nb); 1736 if (ret) 1737 pr_err("Failed to register FF-A bus notifiers\n"); 1738 } 1739 1740 count = ffa_partition_probe(&uuid_null, &pbuf); 1741 if (count <= 0) { 1742 pr_info("%s: No partitions found, error %d\n", __func__, count); 1743 return -EINVAL; 1744 } 1745 1746 xa_init(&drv_info->partition_info); 1747 for (idx = 0, tpbuf = pbuf; idx < count; idx++, tpbuf++) { 1748 /* Note that if the UUID will be uuid_null, that will require 1749 * ffa_bus_notifier() to find the UUID of this partition id 1750 * with help of ffa_device_match_uuid(). FF-A v1.1 and above 1751 * provides UUID here for each partition as part of the 1752 * discovery API and the same is passed. 1753 */ 1754 ffa_dev = ffa_device_register(tpbuf, &ffa_drv_ops); 1755 if (!ffa_dev) { 1756 pr_err("%s: failed to register partition ID 0x%x\n", 1757 __func__, tpbuf->id); 1758 continue; 1759 } 1760 1761 if (drv_info->version > FFA_VERSION_1_0 && 1762 !(tpbuf->properties & FFA_PARTITION_AARCH64_EXEC)) 1763 ffa_mode_32bit_set(ffa_dev); 1764 1765 if (ffa_xa_add_partition_info(ffa_dev)) { 1766 ffa_device_unregister(ffa_dev); 1767 continue; 1768 } 1769 } 1770 1771 kfree(pbuf); 1772 1773 /* 1774 * Check if the host is already added as part of partition info 1775 * No multiple UUID possible for the host, so just checking if 1776 * there is an entry will suffice 1777 */ 1778 if (xa_load(&drv_info->partition_info, drv_info->vm_id)) 1779 return 0; 1780 1781 /* Allocate for the host */ 1782 ret = ffa_setup_host_partition(drv_info->vm_id); 1783 if (ret) 1784 ffa_partitions_cleanup(); 1785 1786 return ret; 1787} 1788 1789/* FFA FEATURE IDs */ 1790#define FFA_FEAT_NOTIFICATION_PENDING_INT (1) 1791#define FFA_FEAT_SCHEDULE_RECEIVER_INT (2) 1792#define FFA_FEAT_MANAGED_EXIT_INT (3) 1793 1794static irqreturn_t ffa_sched_recv_irq_handler(int irq, void *irq_data) 1795{ 1796 struct ffa_pcpu_irq *pcpu = irq_data; 1797 struct ffa_drv_info *info = pcpu->info; 1798 1799 queue_work(info->notif_pcpu_wq, &info->sched_recv_irq_work); 1800 1801 return IRQ_HANDLED; 1802} 1803 1804static irqreturn_t notif_pend_irq_handler(int irq, void *irq_data) 1805{ 1806 struct ffa_pcpu_irq *pcpu = irq_data; 1807 struct ffa_drv_info *info = pcpu->info; 1808 1809 queue_work_on(smp_processor_id(), info->notif_pcpu_wq, 1810 &info->notif_pcpu_work); 1811 1812 return IRQ_HANDLED; 1813} 1814 1815static void ffa_sched_recv_irq_work_fn(struct work_struct *work) 1816{ 1817 ffa_notification_info_get(); 1818} 1819 1820static int ffa_irq_map(u32 id) 1821{ 1822 char *err_str; 1823 int ret, irq, intid; 1824 1825 if (id == FFA_FEAT_NOTIFICATION_PENDING_INT) 1826 err_str = "Notification Pending Interrupt"; 1827 else if (id == FFA_FEAT_SCHEDULE_RECEIVER_INT) 1828 err_str = "Schedule Receiver Interrupt"; 1829 else 1830 err_str = "Unknown ID"; 1831 1832 /* The returned intid is assumed to be SGI donated to NS world */ 1833 ret = ffa_features(id, 0, &intid, NULL); 1834 if (ret < 0) { 1835 if (ret != -EOPNOTSUPP) 1836 pr_err("Failed to retrieve FF-A %s %u\n", err_str, id); 1837 return ret; 1838 } 1839 1840 if (acpi_disabled) { 1841 struct of_phandle_args oirq = {}; 1842 struct device_node *gic; 1843 1844 /* Only GICv3 supported currently with the device tree */ 1845 gic = of_find_compatible_node(NULL, NULL, "arm,gic-v3"); 1846 if (!gic) 1847 return -ENXIO; 1848 1849 oirq.np = gic; 1850 oirq.args_count = 1; 1851 oirq.args[0] = intid; 1852 irq = irq_create_of_mapping(&oirq); 1853 of_node_put(gic); 1854#ifdef CONFIG_ACPI 1855 } else { 1856 irq = acpi_register_gsi(NULL, intid, ACPI_EDGE_SENSITIVE, 1857 ACPI_ACTIVE_HIGH); 1858#endif 1859 } 1860 1861 if (irq <= 0) { 1862 pr_err("Failed to create IRQ mapping!\n"); 1863 return -ENODATA; 1864 } 1865 1866 return irq; 1867} 1868 1869static void ffa_irq_unmap(unsigned int irq) 1870{ 1871 if (!irq) 1872 return; 1873 irq_dispose_mapping(irq); 1874} 1875 1876static int ffa_cpuhp_pcpu_irq_enable(unsigned int cpu) 1877{ 1878 if (drv_info->sched_recv_irq) 1879 enable_percpu_irq(drv_info->sched_recv_irq, IRQ_TYPE_NONE); 1880 if (drv_info->notif_pend_irq) 1881 enable_percpu_irq(drv_info->notif_pend_irq, IRQ_TYPE_NONE); 1882 return 0; 1883} 1884 1885static int ffa_cpuhp_pcpu_irq_disable(unsigned int cpu) 1886{ 1887 if (drv_info->sched_recv_irq) 1888 disable_percpu_irq(drv_info->sched_recv_irq); 1889 if (drv_info->notif_pend_irq) 1890 disable_percpu_irq(drv_info->notif_pend_irq); 1891 return 0; 1892} 1893 1894static void ffa_uninit_pcpu_irq(void) 1895{ 1896 if (drv_info->cpuhp_state) { 1897 cpuhp_remove_state(drv_info->cpuhp_state); 1898 drv_info->cpuhp_state = 0; 1899 } 1900 1901 if (drv_info->notif_pcpu_wq) { 1902 destroy_workqueue(drv_info->notif_pcpu_wq); 1903 drv_info->notif_pcpu_wq = NULL; 1904 } 1905 1906 if (drv_info->sched_recv_irq) 1907 free_percpu_irq(drv_info->sched_recv_irq, drv_info->irq_pcpu); 1908 1909 if (drv_info->notif_pend_irq) 1910 free_percpu_irq(drv_info->notif_pend_irq, drv_info->irq_pcpu); 1911 1912 if (drv_info->irq_pcpu) { 1913 free_percpu(drv_info->irq_pcpu); 1914 drv_info->irq_pcpu = NULL; 1915 } 1916} 1917 1918static int ffa_init_pcpu_irq(void) 1919{ 1920 struct ffa_pcpu_irq __percpu *irq_pcpu; 1921 int ret, cpu; 1922 1923 irq_pcpu = alloc_percpu(struct ffa_pcpu_irq); 1924 if (!irq_pcpu) 1925 return -ENOMEM; 1926 1927 for_each_present_cpu(cpu) 1928 per_cpu_ptr(irq_pcpu, cpu)->info = drv_info; 1929 1930 drv_info->irq_pcpu = irq_pcpu; 1931 1932 if (drv_info->sched_recv_irq) { 1933 ret = request_percpu_irq(drv_info->sched_recv_irq, 1934 ffa_sched_recv_irq_handler, 1935 "ARM-FFA-SRI", irq_pcpu); 1936 if (ret) { 1937 pr_err("Error registering percpu SRI nIRQ %d : %d\n", 1938 drv_info->sched_recv_irq, ret); 1939 drv_info->sched_recv_irq = 0; 1940 return ret; 1941 } 1942 } 1943 1944 if (drv_info->notif_pend_irq) { 1945 ret = request_percpu_irq(drv_info->notif_pend_irq, 1946 notif_pend_irq_handler, 1947 "ARM-FFA-NPI", irq_pcpu); 1948 if (ret) { 1949 pr_err("Error registering percpu NPI nIRQ %d : %d\n", 1950 drv_info->notif_pend_irq, ret); 1951 drv_info->notif_pend_irq = 0; 1952 return ret; 1953 } 1954 } 1955 1956 INIT_WORK(&drv_info->sched_recv_irq_work, ffa_sched_recv_irq_work_fn); 1957 INIT_WORK(&drv_info->notif_pcpu_work, notif_pcpu_irq_work_fn); 1958 drv_info->notif_pcpu_wq = create_workqueue("ffa_pcpu_irq_notification"); 1959 if (!drv_info->notif_pcpu_wq) 1960 return -EINVAL; 1961 1962 ret = cpuhp_setup_state(CPUHP_AP_ONLINE_DYN, "ffa/pcpu-irq:starting", 1963 ffa_cpuhp_pcpu_irq_enable, 1964 ffa_cpuhp_pcpu_irq_disable); 1965 1966 if (ret < 0) 1967 return ret; 1968 1969 drv_info->cpuhp_state = ret; 1970 return 0; 1971} 1972 1973static void ffa_notifications_cleanup(void) 1974{ 1975 ffa_uninit_pcpu_irq(); 1976 ffa_irq_unmap(drv_info->sched_recv_irq); 1977 drv_info->sched_recv_irq = 0; 1978 ffa_irq_unmap(drv_info->notif_pend_irq); 1979 drv_info->notif_pend_irq = 0; 1980 1981 if (drv_info->bitmap_created) { 1982 ffa_notification_bitmap_destroy(); 1983 drv_info->bitmap_created = false; 1984 } 1985 drv_info->notif_enabled = false; 1986} 1987 1988static void ffa_notifications_setup(void) 1989{ 1990 int ret; 1991 1992 ret = ffa_features(FFA_NOTIFICATION_BITMAP_CREATE, 0, NULL, NULL); 1993 if (!ret) { 1994 ret = ffa_notification_bitmap_create(); 1995 if (ret) { 1996 pr_err("Notification bitmap create error %d\n", ret); 1997 return; 1998 } 1999 2000 drv_info->bitmap_created = true; 2001 } 2002 2003 ret = ffa_irq_map(FFA_FEAT_SCHEDULE_RECEIVER_INT); 2004 if (ret > 0) 2005 drv_info->sched_recv_irq = ret; 2006 2007 ret = ffa_irq_map(FFA_FEAT_NOTIFICATION_PENDING_INT); 2008 if (ret > 0) 2009 drv_info->notif_pend_irq = ret; 2010 2011 if (!drv_info->sched_recv_irq && !drv_info->notif_pend_irq) 2012 goto cleanup; 2013 2014 ret = ffa_init_pcpu_irq(); 2015 if (ret) 2016 goto cleanup; 2017 2018 hash_init(drv_info->notifier_hash); 2019 rwlock_init(&drv_info->notify_lock); 2020 2021 drv_info->notif_enabled = true; 2022 return; 2023cleanup: 2024 pr_info("Notification setup failed %d, not enabled\n", ret); 2025 ffa_notifications_cleanup(); 2026} 2027 2028static int __init ffa_init(void) 2029{ 2030 int ret; 2031 u32 buf_sz; 2032 size_t rxtx_bufsz = SZ_4K; 2033 2034 ret = ffa_transport_init(&invoke_ffa_fn); 2035 if (ret) 2036 return ret; 2037 2038 drv_info = kzalloc(sizeof(*drv_info), GFP_KERNEL); 2039 if (!drv_info) 2040 return -ENOMEM; 2041 2042 ret = ffa_version_check(&drv_info->version); 2043 if (ret) 2044 goto free_drv_info; 2045 2046 if (ffa_id_get(&drv_info->vm_id)) { 2047 pr_err("failed to obtain VM id for self\n"); 2048 ret = -ENODEV; 2049 goto free_drv_info; 2050 } 2051 2052 ret = ffa_features(FFA_FN_NATIVE(RXTX_MAP), 0, &buf_sz, NULL); 2053 if (!ret) { 2054 if (RXTX_MAP_MIN_BUFSZ(buf_sz) == 1) 2055 rxtx_bufsz = SZ_64K; 2056 else if (RXTX_MAP_MIN_BUFSZ(buf_sz) == 2) 2057 rxtx_bufsz = SZ_16K; 2058 else 2059 rxtx_bufsz = SZ_4K; 2060 } 2061 2062 drv_info->rxtx_bufsz = rxtx_bufsz; 2063 drv_info->rx_buffer = alloc_pages_exact(rxtx_bufsz, GFP_KERNEL); 2064 if (!drv_info->rx_buffer) { 2065 ret = -ENOMEM; 2066 goto free_pages; 2067 } 2068 2069 drv_info->tx_buffer = alloc_pages_exact(rxtx_bufsz, GFP_KERNEL); 2070 if (!drv_info->tx_buffer) { 2071 ret = -ENOMEM; 2072 goto free_pages; 2073 } 2074 2075 ret = ffa_rxtx_map(virt_to_phys(drv_info->tx_buffer), 2076 virt_to_phys(drv_info->rx_buffer), 2077 rxtx_bufsz / FFA_PAGE_SIZE); 2078 if (ret) { 2079 pr_err("failed to register FFA RxTx buffers\n"); 2080 goto free_pages; 2081 } 2082 2083 mutex_init(&drv_info->rx_lock); 2084 mutex_init(&drv_info->tx_lock); 2085 2086 ffa_drvinfo_flags_init(); 2087 2088 ffa_notifications_setup(); 2089 2090 ret = ffa_setup_partitions(); 2091 if (!ret) 2092 return ret; 2093 2094 pr_err("failed to setup partitions\n"); 2095 ffa_notifications_cleanup(); 2096 ffa_rxtx_unmap(); 2097free_pages: 2098 if (drv_info->tx_buffer) 2099 free_pages_exact(drv_info->tx_buffer, rxtx_bufsz); 2100 free_pages_exact(drv_info->rx_buffer, rxtx_bufsz); 2101free_drv_info: 2102 kfree(drv_info); 2103 return ret; 2104} 2105rootfs_initcall(ffa_init); 2106 2107static void __exit ffa_exit(void) 2108{ 2109 ffa_notifications_cleanup(); 2110 ffa_partitions_cleanup(); 2111 ffa_rxtx_unmap(); 2112 free_pages_exact(drv_info->tx_buffer, drv_info->rxtx_bufsz); 2113 free_pages_exact(drv_info->rx_buffer, drv_info->rxtx_bufsz); 2114 kfree(drv_info); 2115} 2116module_exit(ffa_exit); 2117 2118MODULE_ALIAS("arm-ffa"); 2119MODULE_AUTHOR("Sudeep Holla <sudeep.holla@arm.com>"); 2120MODULE_DESCRIPTION("Arm FF-A interface driver"); 2121MODULE_LICENSE("GPL v2");
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