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/arm_ffa.h> 26 #include <linux/bitfield.h> 27 #include <linux/device.h> 28 #include <linux/io.h> 29 #include <linux/kernel.h> 30 #include <linux/module.h> 31 #include <linux/mm.h> 32 #include <linux/scatterlist.h> 33 #include <linux/slab.h> 34 #include <linux/uuid.h> 35 36 #include "common.h" 37 38 #define FFA_DRIVER_VERSION FFA_VERSION_1_0 39 40 #define FFA_SMC(calling_convention, func_num) \ 41 ARM_SMCCC_CALL_VAL(ARM_SMCCC_FAST_CALL, (calling_convention), \ 42 ARM_SMCCC_OWNER_STANDARD, (func_num)) 43 44 #define FFA_SMC_32(func_num) FFA_SMC(ARM_SMCCC_SMC_32, (func_num)) 45 #define FFA_SMC_64(func_num) FFA_SMC(ARM_SMCCC_SMC_64, (func_num)) 46 47 #define FFA_ERROR FFA_SMC_32(0x60) 48 #define FFA_SUCCESS FFA_SMC_32(0x61) 49 #define FFA_INTERRUPT FFA_SMC_32(0x62) 50 #define FFA_VERSION FFA_SMC_32(0x63) 51 #define FFA_FEATURES FFA_SMC_32(0x64) 52 #define FFA_RX_RELEASE FFA_SMC_32(0x65) 53 #define FFA_RXTX_MAP FFA_SMC_32(0x66) 54 #define FFA_FN64_RXTX_MAP FFA_SMC_64(0x66) 55 #define FFA_RXTX_UNMAP FFA_SMC_32(0x67) 56 #define FFA_PARTITION_INFO_GET FFA_SMC_32(0x68) 57 #define FFA_ID_GET FFA_SMC_32(0x69) 58 #define FFA_MSG_POLL FFA_SMC_32(0x6A) 59 #define FFA_MSG_WAIT FFA_SMC_32(0x6B) 60 #define FFA_YIELD FFA_SMC_32(0x6C) 61 #define FFA_RUN FFA_SMC_32(0x6D) 62 #define FFA_MSG_SEND FFA_SMC_32(0x6E) 63 #define FFA_MSG_SEND_DIRECT_REQ FFA_SMC_32(0x6F) 64 #define FFA_FN64_MSG_SEND_DIRECT_REQ FFA_SMC_64(0x6F) 65 #define FFA_MSG_SEND_DIRECT_RESP FFA_SMC_32(0x70) 66 #define FFA_FN64_MSG_SEND_DIRECT_RESP FFA_SMC_64(0x70) 67 #define FFA_MEM_DONATE FFA_SMC_32(0x71) 68 #define FFA_FN64_MEM_DONATE FFA_SMC_64(0x71) 69 #define FFA_MEM_LEND FFA_SMC_32(0x72) 70 #define FFA_FN64_MEM_LEND FFA_SMC_64(0x72) 71 #define FFA_MEM_SHARE FFA_SMC_32(0x73) 72 #define FFA_FN64_MEM_SHARE FFA_SMC_64(0x73) 73 #define FFA_MEM_RETRIEVE_REQ FFA_SMC_32(0x74) 74 #define FFA_FN64_MEM_RETRIEVE_REQ FFA_SMC_64(0x74) 75 #define FFA_MEM_RETRIEVE_RESP FFA_SMC_32(0x75) 76 #define FFA_MEM_RELINQUISH FFA_SMC_32(0x76) 77 #define FFA_MEM_RECLAIM FFA_SMC_32(0x77) 78 #define FFA_MEM_OP_PAUSE FFA_SMC_32(0x78) 79 #define FFA_MEM_OP_RESUME FFA_SMC_32(0x79) 80 #define FFA_MEM_FRAG_RX FFA_SMC_32(0x7A) 81 #define FFA_MEM_FRAG_TX FFA_SMC_32(0x7B) 82 #define FFA_NORMAL_WORLD_RESUME FFA_SMC_32(0x7C) 83 84 /* 85 * For some calls it is necessary to use SMC64 to pass or return 64-bit values. 86 * For such calls FFA_FN_NATIVE(name) will choose the appropriate 87 * (native-width) function ID. 88 */ 89 #ifdef CONFIG_64BIT 90 #define FFA_FN_NATIVE(name) FFA_FN64_##name 91 #else 92 #define FFA_FN_NATIVE(name) FFA_##name 93 #endif 94 95 /* FFA error codes. */ 96 #define FFA_RET_SUCCESS (0) 97 #define FFA_RET_NOT_SUPPORTED (-1) 98 #define FFA_RET_INVALID_PARAMETERS (-2) 99 #define FFA_RET_NO_MEMORY (-3) 100 #define FFA_RET_BUSY (-4) 101 #define FFA_RET_INTERRUPTED (-5) 102 #define FFA_RET_DENIED (-6) 103 #define FFA_RET_RETRY (-7) 104 #define FFA_RET_ABORTED (-8) 105 106 #define MAJOR_VERSION_MASK GENMASK(30, 16) 107 #define MINOR_VERSION_MASK GENMASK(15, 0) 108 #define MAJOR_VERSION(x) ((u16)(FIELD_GET(MAJOR_VERSION_MASK, (x)))) 109 #define MINOR_VERSION(x) ((u16)(FIELD_GET(MINOR_VERSION_MASK, (x)))) 110 #define PACK_VERSION_INFO(major, minor) \ 111 (FIELD_PREP(MAJOR_VERSION_MASK, (major)) | \ 112 FIELD_PREP(MINOR_VERSION_MASK, (minor))) 113 #define FFA_VERSION_1_0 PACK_VERSION_INFO(1, 0) 114 #define FFA_MIN_VERSION FFA_VERSION_1_0 115 116 #define SENDER_ID_MASK GENMASK(31, 16) 117 #define RECEIVER_ID_MASK GENMASK(15, 0) 118 #define SENDER_ID(x) ((u16)(FIELD_GET(SENDER_ID_MASK, (x)))) 119 #define RECEIVER_ID(x) ((u16)(FIELD_GET(RECEIVER_ID_MASK, (x)))) 120 #define PACK_TARGET_INFO(s, r) \ 121 (FIELD_PREP(SENDER_ID_MASK, (s)) | FIELD_PREP(RECEIVER_ID_MASK, (r))) 122 123 /** 124 * FF-A specification mentions explicitly about '4K pages'. This should 125 * not be confused with the kernel PAGE_SIZE, which is the translation 126 * granule kernel is configured and may be one among 4K, 16K and 64K. 127 */ 128 #define FFA_PAGE_SIZE SZ_4K 129 /* 130 * Keeping RX TX buffer size as 4K for now 131 * 64K may be preferred to keep it min a page in 64K PAGE_SIZE config 132 */ 133 #define RXTX_BUFFER_SIZE SZ_4K 134 135 static ffa_fn *invoke_ffa_fn; 136 137 static const int ffa_linux_errmap[] = { 138 /* better than switch case as long as return value is continuous */ 139 0, /* FFA_RET_SUCCESS */ 140 -EOPNOTSUPP, /* FFA_RET_NOT_SUPPORTED */ 141 -EINVAL, /* FFA_RET_INVALID_PARAMETERS */ 142 -ENOMEM, /* FFA_RET_NO_MEMORY */ 143 -EBUSY, /* FFA_RET_BUSY */ 144 -EINTR, /* FFA_RET_INTERRUPTED */ 145 -EACCES, /* FFA_RET_DENIED */ 146 -EAGAIN, /* FFA_RET_RETRY */ 147 -ECANCELED, /* FFA_RET_ABORTED */ 148 }; 149 150 static inline int ffa_to_linux_errno(int errno) 151 { 152 if (errno < FFA_RET_SUCCESS && errno >= -ARRAY_SIZE(ffa_linux_errmap)) 153 return ffa_linux_errmap[-errno]; 154 return -EINVAL; 155 } 156 157 struct ffa_drv_info { 158 u32 version; 159 u16 vm_id; 160 struct mutex rx_lock; /* lock to protect Rx buffer */ 161 struct mutex tx_lock; /* lock to protect Tx buffer */ 162 void *rx_buffer; 163 void *tx_buffer; 164 }; 165 166 static struct ffa_drv_info *drv_info; 167 168 static int ffa_version_check(u32 *version) 169 { 170 ffa_value_t ver; 171 172 invoke_ffa_fn((ffa_value_t){ 173 .a0 = FFA_VERSION, .a1 = FFA_DRIVER_VERSION, 174 }, &ver); 175 176 if (ver.a0 == FFA_RET_NOT_SUPPORTED) { 177 pr_info("FFA_VERSION returned not supported\n"); 178 return -EOPNOTSUPP; 179 } 180 181 if (ver.a0 < FFA_MIN_VERSION || ver.a0 > FFA_DRIVER_VERSION) { 182 pr_err("Incompatible version %d.%d found\n", 183 MAJOR_VERSION(ver.a0), MINOR_VERSION(ver.a0)); 184 return -EINVAL; 185 } 186 187 *version = ver.a0; 188 pr_info("Version %d.%d found\n", MAJOR_VERSION(ver.a0), 189 MINOR_VERSION(ver.a0)); 190 return 0; 191 } 192 193 static int ffa_rx_release(void) 194 { 195 ffa_value_t ret; 196 197 invoke_ffa_fn((ffa_value_t){ 198 .a0 = FFA_RX_RELEASE, 199 }, &ret); 200 201 if (ret.a0 == FFA_ERROR) 202 return ffa_to_linux_errno((int)ret.a2); 203 204 /* check for ret.a0 == FFA_RX_RELEASE ? */ 205 206 return 0; 207 } 208 209 static int ffa_rxtx_map(phys_addr_t tx_buf, phys_addr_t rx_buf, u32 pg_cnt) 210 { 211 ffa_value_t ret; 212 213 invoke_ffa_fn((ffa_value_t){ 214 .a0 = FFA_FN_NATIVE(RXTX_MAP), 215 .a1 = tx_buf, .a2 = rx_buf, .a3 = pg_cnt, 216 }, &ret); 217 218 if (ret.a0 == FFA_ERROR) 219 return ffa_to_linux_errno((int)ret.a2); 220 221 return 0; 222 } 223 224 static int ffa_rxtx_unmap(u16 vm_id) 225 { 226 ffa_value_t ret; 227 228 invoke_ffa_fn((ffa_value_t){ 229 .a0 = FFA_RXTX_UNMAP, .a1 = PACK_TARGET_INFO(vm_id, 0), 230 }, &ret); 231 232 if (ret.a0 == FFA_ERROR) 233 return ffa_to_linux_errno((int)ret.a2); 234 235 return 0; 236 } 237 238 /* buffer must be sizeof(struct ffa_partition_info) * num_partitions */ 239 static int 240 __ffa_partition_info_get(u32 uuid0, u32 uuid1, u32 uuid2, u32 uuid3, 241 struct ffa_partition_info *buffer, int num_partitions) 242 { 243 int count; 244 ffa_value_t partition_info; 245 246 mutex_lock(&drv_info->rx_lock); 247 invoke_ffa_fn((ffa_value_t){ 248 .a0 = FFA_PARTITION_INFO_GET, 249 .a1 = uuid0, .a2 = uuid1, .a3 = uuid2, .a4 = uuid3, 250 }, &partition_info); 251 252 if (partition_info.a0 == FFA_ERROR) { 253 mutex_unlock(&drv_info->rx_lock); 254 return ffa_to_linux_errno((int)partition_info.a2); 255 } 256 257 count = partition_info.a2; 258 259 if (buffer && count <= num_partitions) 260 memcpy(buffer, drv_info->rx_buffer, sizeof(*buffer) * count); 261 262 ffa_rx_release(); 263 264 mutex_unlock(&drv_info->rx_lock); 265 266 return count; 267 } 268 269 /* buffer is allocated and caller must free the same if returned count > 0 */ 270 static int 271 ffa_partition_probe(const uuid_t *uuid, struct ffa_partition_info **buffer) 272 { 273 int count; 274 u32 uuid0_4[4]; 275 struct ffa_partition_info *pbuf; 276 277 export_uuid((u8 *)uuid0_4, uuid); 278 count = __ffa_partition_info_get(uuid0_4[0], uuid0_4[1], uuid0_4[2], 279 uuid0_4[3], NULL, 0); 280 if (count <= 0) 281 return count; 282 283 pbuf = kcalloc(count, sizeof(*pbuf), GFP_KERNEL); 284 if (!pbuf) 285 return -ENOMEM; 286 287 count = __ffa_partition_info_get(uuid0_4[0], uuid0_4[1], uuid0_4[2], 288 uuid0_4[3], pbuf, count); 289 if (count <= 0) 290 kfree(pbuf); 291 else 292 *buffer = pbuf; 293 294 return count; 295 } 296 297 #define VM_ID_MASK GENMASK(15, 0) 298 static int ffa_id_get(u16 *vm_id) 299 { 300 ffa_value_t id; 301 302 invoke_ffa_fn((ffa_value_t){ 303 .a0 = FFA_ID_GET, 304 }, &id); 305 306 if (id.a0 == FFA_ERROR) 307 return ffa_to_linux_errno((int)id.a2); 308 309 *vm_id = FIELD_GET(VM_ID_MASK, (id.a2)); 310 311 return 0; 312 } 313 314 static int ffa_msg_send_direct_req(u16 src_id, u16 dst_id, bool mode_32bit, 315 struct ffa_send_direct_data *data) 316 { 317 u32 req_id, resp_id, src_dst_ids = PACK_TARGET_INFO(src_id, dst_id); 318 ffa_value_t ret; 319 320 if (mode_32bit) { 321 req_id = FFA_MSG_SEND_DIRECT_REQ; 322 resp_id = FFA_MSG_SEND_DIRECT_RESP; 323 } else { 324 req_id = FFA_FN_NATIVE(MSG_SEND_DIRECT_REQ); 325 resp_id = FFA_FN_NATIVE(MSG_SEND_DIRECT_RESP); 326 } 327 328 invoke_ffa_fn((ffa_value_t){ 329 .a0 = req_id, .a1 = src_dst_ids, .a2 = 0, 330 .a3 = data->data0, .a4 = data->data1, .a5 = data->data2, 331 .a6 = data->data3, .a7 = data->data4, 332 }, &ret); 333 334 while (ret.a0 == FFA_INTERRUPT) 335 invoke_ffa_fn((ffa_value_t){ 336 .a0 = FFA_RUN, .a1 = ret.a1, 337 }, &ret); 338 339 if (ret.a0 == FFA_ERROR) 340 return ffa_to_linux_errno((int)ret.a2); 341 342 if (ret.a0 == resp_id) { 343 data->data0 = ret.a3; 344 data->data1 = ret.a4; 345 data->data2 = ret.a5; 346 data->data3 = ret.a6; 347 data->data4 = ret.a7; 348 return 0; 349 } 350 351 return -EINVAL; 352 } 353 354 static int ffa_mem_first_frag(u32 func_id, phys_addr_t buf, u32 buf_sz, 355 u32 frag_len, u32 len, u64 *handle) 356 { 357 ffa_value_t ret; 358 359 invoke_ffa_fn((ffa_value_t){ 360 .a0 = func_id, .a1 = len, .a2 = frag_len, 361 .a3 = buf, .a4 = buf_sz, 362 }, &ret); 363 364 while (ret.a0 == FFA_MEM_OP_PAUSE) 365 invoke_ffa_fn((ffa_value_t){ 366 .a0 = FFA_MEM_OP_RESUME, 367 .a1 = ret.a1, .a2 = ret.a2, 368 }, &ret); 369 370 if (ret.a0 == FFA_ERROR) 371 return ffa_to_linux_errno((int)ret.a2); 372 373 if (ret.a0 != FFA_SUCCESS) 374 return -EOPNOTSUPP; 375 376 if (handle) 377 *handle = PACK_HANDLE(ret.a2, ret.a3); 378 379 return frag_len; 380 } 381 382 static int ffa_mem_next_frag(u64 handle, u32 frag_len) 383 { 384 ffa_value_t ret; 385 386 invoke_ffa_fn((ffa_value_t){ 387 .a0 = FFA_MEM_FRAG_TX, 388 .a1 = HANDLE_LOW(handle), .a2 = HANDLE_HIGH(handle), 389 .a3 = frag_len, 390 }, &ret); 391 392 while (ret.a0 == FFA_MEM_OP_PAUSE) 393 invoke_ffa_fn((ffa_value_t){ 394 .a0 = FFA_MEM_OP_RESUME, 395 .a1 = ret.a1, .a2 = ret.a2, 396 }, &ret); 397 398 if (ret.a0 == FFA_ERROR) 399 return ffa_to_linux_errno((int)ret.a2); 400 401 if (ret.a0 != FFA_MEM_FRAG_RX) 402 return -EOPNOTSUPP; 403 404 return ret.a3; 405 } 406 407 static int 408 ffa_transmit_fragment(u32 func_id, phys_addr_t buf, u32 buf_sz, u32 frag_len, 409 u32 len, u64 *handle, bool first) 410 { 411 if (!first) 412 return ffa_mem_next_frag(*handle, frag_len); 413 414 return ffa_mem_first_frag(func_id, buf, buf_sz, frag_len, len, handle); 415 } 416 417 static u32 ffa_get_num_pages_sg(struct scatterlist *sg) 418 { 419 u32 num_pages = 0; 420 421 do { 422 num_pages += sg->length / FFA_PAGE_SIZE; 423 } while ((sg = sg_next(sg))); 424 425 return num_pages; 426 } 427 428 static int 429 ffa_setup_and_transmit(u32 func_id, void *buffer, u32 max_fragsize, 430 struct ffa_mem_ops_args *args) 431 { 432 int rc = 0; 433 bool first = true; 434 phys_addr_t addr = 0; 435 struct ffa_composite_mem_region *composite; 436 struct ffa_mem_region_addr_range *constituents; 437 struct ffa_mem_region_attributes *ep_mem_access; 438 struct ffa_mem_region *mem_region = buffer; 439 u32 idx, frag_len, length, buf_sz = 0, num_entries = sg_nents(args->sg); 440 441 mem_region->tag = args->tag; 442 mem_region->flags = args->flags; 443 mem_region->sender_id = drv_info->vm_id; 444 mem_region->attributes = FFA_MEM_NORMAL | FFA_MEM_WRITE_BACK | 445 FFA_MEM_INNER_SHAREABLE; 446 ep_mem_access = &mem_region->ep_mem_access[0]; 447 448 for (idx = 0; idx < args->nattrs; idx++, ep_mem_access++) { 449 ep_mem_access->receiver = args->attrs[idx].receiver; 450 ep_mem_access->attrs = args->attrs[idx].attrs; 451 ep_mem_access->composite_off = COMPOSITE_OFFSET(args->nattrs); 452 } 453 mem_region->ep_count = args->nattrs; 454 455 composite = buffer + COMPOSITE_OFFSET(args->nattrs); 456 composite->total_pg_cnt = ffa_get_num_pages_sg(args->sg); 457 composite->addr_range_cnt = num_entries; 458 459 length = COMPOSITE_CONSTITUENTS_OFFSET(args->nattrs, num_entries); 460 frag_len = COMPOSITE_CONSTITUENTS_OFFSET(args->nattrs, 0); 461 if (frag_len > max_fragsize) 462 return -ENXIO; 463 464 if (!args->use_txbuf) { 465 addr = virt_to_phys(buffer); 466 buf_sz = max_fragsize / FFA_PAGE_SIZE; 467 } 468 469 constituents = buffer + frag_len; 470 idx = 0; 471 do { 472 if (frag_len == max_fragsize) { 473 rc = ffa_transmit_fragment(func_id, addr, buf_sz, 474 frag_len, length, 475 &args->g_handle, first); 476 if (rc < 0) 477 return -ENXIO; 478 479 first = false; 480 idx = 0; 481 frag_len = 0; 482 constituents = buffer; 483 } 484 485 if ((void *)constituents - buffer > max_fragsize) { 486 pr_err("Memory Region Fragment > Tx Buffer size\n"); 487 return -EFAULT; 488 } 489 490 constituents->address = sg_phys(args->sg); 491 constituents->pg_cnt = args->sg->length / FFA_PAGE_SIZE; 492 constituents++; 493 frag_len += sizeof(struct ffa_mem_region_addr_range); 494 } while ((args->sg = sg_next(args->sg))); 495 496 return ffa_transmit_fragment(func_id, addr, buf_sz, frag_len, 497 length, &args->g_handle, first); 498 } 499 500 static int ffa_memory_ops(u32 func_id, struct ffa_mem_ops_args *args) 501 { 502 int ret; 503 void *buffer; 504 505 if (!args->use_txbuf) { 506 buffer = alloc_pages_exact(RXTX_BUFFER_SIZE, GFP_KERNEL); 507 if (!buffer) 508 return -ENOMEM; 509 } else { 510 buffer = drv_info->tx_buffer; 511 mutex_lock(&drv_info->tx_lock); 512 } 513 514 ret = ffa_setup_and_transmit(func_id, buffer, RXTX_BUFFER_SIZE, args); 515 516 if (args->use_txbuf) 517 mutex_unlock(&drv_info->tx_lock); 518 else 519 free_pages_exact(buffer, RXTX_BUFFER_SIZE); 520 521 return ret < 0 ? ret : 0; 522 } 523 524 static int ffa_memory_reclaim(u64 g_handle, u32 flags) 525 { 526 ffa_value_t ret; 527 528 invoke_ffa_fn((ffa_value_t){ 529 .a0 = FFA_MEM_RECLAIM, 530 .a1 = HANDLE_LOW(g_handle), .a2 = HANDLE_HIGH(g_handle), 531 .a3 = flags, 532 }, &ret); 533 534 if (ret.a0 == FFA_ERROR) 535 return ffa_to_linux_errno((int)ret.a2); 536 537 return 0; 538 } 539 540 static u32 ffa_api_version_get(void) 541 { 542 return drv_info->version; 543 } 544 545 static int ffa_partition_info_get(const char *uuid_str, 546 struct ffa_partition_info *buffer) 547 { 548 int count; 549 uuid_t uuid; 550 struct ffa_partition_info *pbuf; 551 552 if (uuid_parse(uuid_str, &uuid)) { 553 pr_err("invalid uuid (%s)\n", uuid_str); 554 return -ENODEV; 555 } 556 557 count = ffa_partition_probe(&uuid_null, &pbuf); 558 if (count <= 0) 559 return -ENOENT; 560 561 memcpy(buffer, pbuf, sizeof(*pbuf) * count); 562 kfree(pbuf); 563 return 0; 564 } 565 566 static void ffa_mode_32bit_set(struct ffa_device *dev) 567 { 568 dev->mode_32bit = true; 569 } 570 571 static int ffa_sync_send_receive(struct ffa_device *dev, 572 struct ffa_send_direct_data *data) 573 { 574 return ffa_msg_send_direct_req(drv_info->vm_id, dev->vm_id, 575 dev->mode_32bit, data); 576 } 577 578 static int 579 ffa_memory_share(struct ffa_device *dev, struct ffa_mem_ops_args *args) 580 { 581 if (dev->mode_32bit) 582 return ffa_memory_ops(FFA_MEM_SHARE, args); 583 584 return ffa_memory_ops(FFA_FN_NATIVE(MEM_SHARE), args); 585 } 586 587 static const struct ffa_dev_ops ffa_ops = { 588 .api_version_get = ffa_api_version_get, 589 .partition_info_get = ffa_partition_info_get, 590 .mode_32bit_set = ffa_mode_32bit_set, 591 .sync_send_receive = ffa_sync_send_receive, 592 .memory_reclaim = ffa_memory_reclaim, 593 .memory_share = ffa_memory_share, 594 }; 595 596 const struct ffa_dev_ops *ffa_dev_ops_get(struct ffa_device *dev) 597 { 598 if (ffa_device_is_valid(dev)) 599 return &ffa_ops; 600 601 return NULL; 602 } 603 EXPORT_SYMBOL_GPL(ffa_dev_ops_get); 604 605 void ffa_device_match_uuid(struct ffa_device *ffa_dev, const uuid_t *uuid) 606 { 607 int count, idx; 608 struct ffa_partition_info *pbuf, *tpbuf; 609 610 count = ffa_partition_probe(uuid, &pbuf); 611 if (count <= 0) 612 return; 613 614 for (idx = 0, tpbuf = pbuf; idx < count; idx++, tpbuf++) 615 if (tpbuf->id == ffa_dev->vm_id) 616 uuid_copy(&ffa_dev->uuid, uuid); 617 kfree(pbuf); 618 } 619 620 static void ffa_setup_partitions(void) 621 { 622 int count, idx; 623 struct ffa_device *ffa_dev; 624 struct ffa_partition_info *pbuf, *tpbuf; 625 626 count = ffa_partition_probe(&uuid_null, &pbuf); 627 if (count <= 0) { 628 pr_info("%s: No partitions found, error %d\n", __func__, count); 629 return; 630 } 631 632 for (idx = 0, tpbuf = pbuf; idx < count; idx++, tpbuf++) { 633 /* Note that the &uuid_null parameter will require 634 * ffa_device_match() to find the UUID of this partition id 635 * with help of ffa_device_match_uuid(). Once the FF-A spec 636 * is updated to provide correct UUID here for each partition 637 * as part of the discovery API, we need to pass the 638 * discovered UUID here instead. 639 */ 640 ffa_dev = ffa_device_register(&uuid_null, tpbuf->id); 641 if (!ffa_dev) { 642 pr_err("%s: failed to register partition ID 0x%x\n", 643 __func__, tpbuf->id); 644 continue; 645 } 646 647 ffa_dev_set_drvdata(ffa_dev, drv_info); 648 } 649 kfree(pbuf); 650 } 651 652 static int __init ffa_init(void) 653 { 654 int ret; 655 656 ret = ffa_transport_init(&invoke_ffa_fn); 657 if (ret) 658 return ret; 659 660 ret = arm_ffa_bus_init(); 661 if (ret) 662 return ret; 663 664 drv_info = kzalloc(sizeof(*drv_info), GFP_KERNEL); 665 if (!drv_info) { 666 ret = -ENOMEM; 667 goto ffa_bus_exit; 668 } 669 670 ret = ffa_version_check(&drv_info->version); 671 if (ret) 672 goto free_drv_info; 673 674 if (ffa_id_get(&drv_info->vm_id)) { 675 pr_err("failed to obtain VM id for self\n"); 676 ret = -ENODEV; 677 goto free_drv_info; 678 } 679 680 drv_info->rx_buffer = alloc_pages_exact(RXTX_BUFFER_SIZE, GFP_KERNEL); 681 if (!drv_info->rx_buffer) { 682 ret = -ENOMEM; 683 goto free_pages; 684 } 685 686 drv_info->tx_buffer = alloc_pages_exact(RXTX_BUFFER_SIZE, GFP_KERNEL); 687 if (!drv_info->tx_buffer) { 688 ret = -ENOMEM; 689 goto free_pages; 690 } 691 692 ret = ffa_rxtx_map(virt_to_phys(drv_info->tx_buffer), 693 virt_to_phys(drv_info->rx_buffer), 694 RXTX_BUFFER_SIZE / FFA_PAGE_SIZE); 695 if (ret) { 696 pr_err("failed to register FFA RxTx buffers\n"); 697 goto free_pages; 698 } 699 700 mutex_init(&drv_info->rx_lock); 701 mutex_init(&drv_info->tx_lock); 702 703 ffa_setup_partitions(); 704 705 return 0; 706 free_pages: 707 if (drv_info->tx_buffer) 708 free_pages_exact(drv_info->tx_buffer, RXTX_BUFFER_SIZE); 709 free_pages_exact(drv_info->rx_buffer, RXTX_BUFFER_SIZE); 710 free_drv_info: 711 kfree(drv_info); 712 ffa_bus_exit: 713 arm_ffa_bus_exit(); 714 return ret; 715 } 716 subsys_initcall(ffa_init); 717 718 static void __exit ffa_exit(void) 719 { 720 ffa_rxtx_unmap(drv_info->vm_id); 721 free_pages_exact(drv_info->tx_buffer, RXTX_BUFFER_SIZE); 722 free_pages_exact(drv_info->rx_buffer, RXTX_BUFFER_SIZE); 723 kfree(drv_info); 724 arm_ffa_bus_exit(); 725 } 726 module_exit(ffa_exit); 727 728 MODULE_ALIAS("arm-ffa"); 729 MODULE_AUTHOR("Sudeep Holla <sudeep.holla@arm.com>"); 730 MODULE_DESCRIPTION("Arm FF-A interface driver"); 731 MODULE_LICENSE("GPL v2"); 732