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 int err_idx = -errno; 153 154 if (err_idx >= 0 && err_idx < ARRAY_SIZE(ffa_linux_errmap)) 155 return ffa_linux_errmap[err_idx]; 156 return -EINVAL; 157 } 158 159 struct ffa_drv_info { 160 u32 version; 161 u16 vm_id; 162 struct mutex rx_lock; /* lock to protect Rx buffer */ 163 struct mutex tx_lock; /* lock to protect Tx buffer */ 164 void *rx_buffer; 165 void *tx_buffer; 166 }; 167 168 static struct ffa_drv_info *drv_info; 169 170 /* 171 * The driver must be able to support all the versions from the earliest 172 * supported FFA_MIN_VERSION to the latest supported FFA_DRIVER_VERSION. 173 * The specification states that if firmware supports a FFA implementation 174 * that is incompatible with and at a greater version number than specified 175 * by the caller(FFA_DRIVER_VERSION passed as parameter to FFA_VERSION), 176 * it must return the NOT_SUPPORTED error code. 177 */ 178 static u32 ffa_compatible_version_find(u32 version) 179 { 180 u16 major = MAJOR_VERSION(version), minor = MINOR_VERSION(version); 181 u16 drv_major = MAJOR_VERSION(FFA_DRIVER_VERSION); 182 u16 drv_minor = MINOR_VERSION(FFA_DRIVER_VERSION); 183 184 if ((major < drv_major) || (major == drv_major && minor <= drv_minor)) 185 return version; 186 187 pr_info("Firmware version higher than driver version, downgrading\n"); 188 return FFA_DRIVER_VERSION; 189 } 190 191 static int ffa_version_check(u32 *version) 192 { 193 ffa_value_t ver; 194 195 invoke_ffa_fn((ffa_value_t){ 196 .a0 = FFA_VERSION, .a1 = FFA_DRIVER_VERSION, 197 }, &ver); 198 199 if (ver.a0 == FFA_RET_NOT_SUPPORTED) { 200 pr_info("FFA_VERSION returned not supported\n"); 201 return -EOPNOTSUPP; 202 } 203 204 if (ver.a0 < FFA_MIN_VERSION) { 205 pr_err("Incompatible v%d.%d! Earliest supported v%d.%d\n", 206 MAJOR_VERSION(ver.a0), MINOR_VERSION(ver.a0), 207 MAJOR_VERSION(FFA_MIN_VERSION), 208 MINOR_VERSION(FFA_MIN_VERSION)); 209 return -EINVAL; 210 } 211 212 pr_info("Driver version %d.%d\n", MAJOR_VERSION(FFA_DRIVER_VERSION), 213 MINOR_VERSION(FFA_DRIVER_VERSION)); 214 pr_info("Firmware version %d.%d found\n", MAJOR_VERSION(ver.a0), 215 MINOR_VERSION(ver.a0)); 216 *version = ffa_compatible_version_find(ver.a0); 217 218 return 0; 219 } 220 221 static int ffa_rx_release(void) 222 { 223 ffa_value_t ret; 224 225 invoke_ffa_fn((ffa_value_t){ 226 .a0 = FFA_RX_RELEASE, 227 }, &ret); 228 229 if (ret.a0 == FFA_ERROR) 230 return ffa_to_linux_errno((int)ret.a2); 231 232 /* check for ret.a0 == FFA_RX_RELEASE ? */ 233 234 return 0; 235 } 236 237 static int ffa_rxtx_map(phys_addr_t tx_buf, phys_addr_t rx_buf, u32 pg_cnt) 238 { 239 ffa_value_t ret; 240 241 invoke_ffa_fn((ffa_value_t){ 242 .a0 = FFA_FN_NATIVE(RXTX_MAP), 243 .a1 = tx_buf, .a2 = rx_buf, .a3 = pg_cnt, 244 }, &ret); 245 246 if (ret.a0 == FFA_ERROR) 247 return ffa_to_linux_errno((int)ret.a2); 248 249 return 0; 250 } 251 252 static int ffa_rxtx_unmap(u16 vm_id) 253 { 254 ffa_value_t ret; 255 256 invoke_ffa_fn((ffa_value_t){ 257 .a0 = FFA_RXTX_UNMAP, .a1 = PACK_TARGET_INFO(vm_id, 0), 258 }, &ret); 259 260 if (ret.a0 == FFA_ERROR) 261 return ffa_to_linux_errno((int)ret.a2); 262 263 return 0; 264 } 265 266 /* buffer must be sizeof(struct ffa_partition_info) * num_partitions */ 267 static int 268 __ffa_partition_info_get(u32 uuid0, u32 uuid1, u32 uuid2, u32 uuid3, 269 struct ffa_partition_info *buffer, int num_partitions) 270 { 271 int count; 272 ffa_value_t partition_info; 273 274 mutex_lock(&drv_info->rx_lock); 275 invoke_ffa_fn((ffa_value_t){ 276 .a0 = FFA_PARTITION_INFO_GET, 277 .a1 = uuid0, .a2 = uuid1, .a3 = uuid2, .a4 = uuid3, 278 }, &partition_info); 279 280 if (partition_info.a0 == FFA_ERROR) { 281 mutex_unlock(&drv_info->rx_lock); 282 return ffa_to_linux_errno((int)partition_info.a2); 283 } 284 285 count = partition_info.a2; 286 287 if (buffer && count <= num_partitions) 288 memcpy(buffer, drv_info->rx_buffer, sizeof(*buffer) * count); 289 290 ffa_rx_release(); 291 292 mutex_unlock(&drv_info->rx_lock); 293 294 return count; 295 } 296 297 /* buffer is allocated and caller must free the same if returned count > 0 */ 298 static int 299 ffa_partition_probe(const uuid_t *uuid, struct ffa_partition_info **buffer) 300 { 301 int count; 302 u32 uuid0_4[4]; 303 struct ffa_partition_info *pbuf; 304 305 export_uuid((u8 *)uuid0_4, uuid); 306 count = __ffa_partition_info_get(uuid0_4[0], uuid0_4[1], uuid0_4[2], 307 uuid0_4[3], NULL, 0); 308 if (count <= 0) 309 return count; 310 311 pbuf = kcalloc(count, sizeof(*pbuf), GFP_KERNEL); 312 if (!pbuf) 313 return -ENOMEM; 314 315 count = __ffa_partition_info_get(uuid0_4[0], uuid0_4[1], uuid0_4[2], 316 uuid0_4[3], pbuf, count); 317 if (count <= 0) 318 kfree(pbuf); 319 else 320 *buffer = pbuf; 321 322 return count; 323 } 324 325 #define VM_ID_MASK GENMASK(15, 0) 326 static int ffa_id_get(u16 *vm_id) 327 { 328 ffa_value_t id; 329 330 invoke_ffa_fn((ffa_value_t){ 331 .a0 = FFA_ID_GET, 332 }, &id); 333 334 if (id.a0 == FFA_ERROR) 335 return ffa_to_linux_errno((int)id.a2); 336 337 *vm_id = FIELD_GET(VM_ID_MASK, (id.a2)); 338 339 return 0; 340 } 341 342 static int ffa_msg_send_direct_req(u16 src_id, u16 dst_id, bool mode_32bit, 343 struct ffa_send_direct_data *data) 344 { 345 u32 req_id, resp_id, src_dst_ids = PACK_TARGET_INFO(src_id, dst_id); 346 ffa_value_t ret; 347 348 if (mode_32bit) { 349 req_id = FFA_MSG_SEND_DIRECT_REQ; 350 resp_id = FFA_MSG_SEND_DIRECT_RESP; 351 } else { 352 req_id = FFA_FN_NATIVE(MSG_SEND_DIRECT_REQ); 353 resp_id = FFA_FN_NATIVE(MSG_SEND_DIRECT_RESP); 354 } 355 356 invoke_ffa_fn((ffa_value_t){ 357 .a0 = req_id, .a1 = src_dst_ids, .a2 = 0, 358 .a3 = data->data0, .a4 = data->data1, .a5 = data->data2, 359 .a6 = data->data3, .a7 = data->data4, 360 }, &ret); 361 362 while (ret.a0 == FFA_INTERRUPT) 363 invoke_ffa_fn((ffa_value_t){ 364 .a0 = FFA_RUN, .a1 = ret.a1, 365 }, &ret); 366 367 if (ret.a0 == FFA_ERROR) 368 return ffa_to_linux_errno((int)ret.a2); 369 370 if (ret.a0 == resp_id) { 371 data->data0 = ret.a3; 372 data->data1 = ret.a4; 373 data->data2 = ret.a5; 374 data->data3 = ret.a6; 375 data->data4 = ret.a7; 376 return 0; 377 } 378 379 return -EINVAL; 380 } 381 382 static int ffa_mem_first_frag(u32 func_id, phys_addr_t buf, u32 buf_sz, 383 u32 frag_len, u32 len, u64 *handle) 384 { 385 ffa_value_t ret; 386 387 invoke_ffa_fn((ffa_value_t){ 388 .a0 = func_id, .a1 = len, .a2 = frag_len, 389 .a3 = buf, .a4 = buf_sz, 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_SUCCESS) { 402 if (handle) 403 *handle = PACK_HANDLE(ret.a2, ret.a3); 404 } else if (ret.a0 == FFA_MEM_FRAG_RX) { 405 if (handle) 406 *handle = PACK_HANDLE(ret.a1, ret.a2); 407 } else { 408 return -EOPNOTSUPP; 409 } 410 411 return frag_len; 412 } 413 414 static int ffa_mem_next_frag(u64 handle, u32 frag_len) 415 { 416 ffa_value_t ret; 417 418 invoke_ffa_fn((ffa_value_t){ 419 .a0 = FFA_MEM_FRAG_TX, 420 .a1 = HANDLE_LOW(handle), .a2 = HANDLE_HIGH(handle), 421 .a3 = frag_len, 422 }, &ret); 423 424 while (ret.a0 == FFA_MEM_OP_PAUSE) 425 invoke_ffa_fn((ffa_value_t){ 426 .a0 = FFA_MEM_OP_RESUME, 427 .a1 = ret.a1, .a2 = ret.a2, 428 }, &ret); 429 430 if (ret.a0 == FFA_ERROR) 431 return ffa_to_linux_errno((int)ret.a2); 432 433 if (ret.a0 == FFA_MEM_FRAG_RX) 434 return ret.a3; 435 else if (ret.a0 == FFA_SUCCESS) 436 return 0; 437 438 return -EOPNOTSUPP; 439 } 440 441 static int 442 ffa_transmit_fragment(u32 func_id, phys_addr_t buf, u32 buf_sz, u32 frag_len, 443 u32 len, u64 *handle, bool first) 444 { 445 if (!first) 446 return ffa_mem_next_frag(*handle, frag_len); 447 448 return ffa_mem_first_frag(func_id, buf, buf_sz, frag_len, len, handle); 449 } 450 451 static u32 ffa_get_num_pages_sg(struct scatterlist *sg) 452 { 453 u32 num_pages = 0; 454 455 do { 456 num_pages += sg->length / FFA_PAGE_SIZE; 457 } while ((sg = sg_next(sg))); 458 459 return num_pages; 460 } 461 462 static int 463 ffa_setup_and_transmit(u32 func_id, void *buffer, u32 max_fragsize, 464 struct ffa_mem_ops_args *args) 465 { 466 int rc = 0; 467 bool first = true; 468 phys_addr_t addr = 0; 469 struct ffa_composite_mem_region *composite; 470 struct ffa_mem_region_addr_range *constituents; 471 struct ffa_mem_region_attributes *ep_mem_access; 472 struct ffa_mem_region *mem_region = buffer; 473 u32 idx, frag_len, length, buf_sz = 0, num_entries = sg_nents(args->sg); 474 475 mem_region->tag = args->tag; 476 mem_region->flags = args->flags; 477 mem_region->sender_id = drv_info->vm_id; 478 mem_region->attributes = FFA_MEM_NORMAL | FFA_MEM_WRITE_BACK | 479 FFA_MEM_INNER_SHAREABLE; 480 ep_mem_access = &mem_region->ep_mem_access[0]; 481 482 for (idx = 0; idx < args->nattrs; idx++, ep_mem_access++) { 483 ep_mem_access->receiver = args->attrs[idx].receiver; 484 ep_mem_access->attrs = args->attrs[idx].attrs; 485 ep_mem_access->composite_off = COMPOSITE_OFFSET(args->nattrs); 486 } 487 mem_region->ep_count = args->nattrs; 488 489 composite = buffer + COMPOSITE_OFFSET(args->nattrs); 490 composite->total_pg_cnt = ffa_get_num_pages_sg(args->sg); 491 composite->addr_range_cnt = num_entries; 492 493 length = COMPOSITE_CONSTITUENTS_OFFSET(args->nattrs, num_entries); 494 frag_len = COMPOSITE_CONSTITUENTS_OFFSET(args->nattrs, 0); 495 if (frag_len > max_fragsize) 496 return -ENXIO; 497 498 if (!args->use_txbuf) { 499 addr = virt_to_phys(buffer); 500 buf_sz = max_fragsize / FFA_PAGE_SIZE; 501 } 502 503 constituents = buffer + frag_len; 504 idx = 0; 505 do { 506 if (frag_len == max_fragsize) { 507 rc = ffa_transmit_fragment(func_id, addr, buf_sz, 508 frag_len, length, 509 &args->g_handle, first); 510 if (rc < 0) 511 return -ENXIO; 512 513 first = false; 514 idx = 0; 515 frag_len = 0; 516 constituents = buffer; 517 } 518 519 if ((void *)constituents - buffer > max_fragsize) { 520 pr_err("Memory Region Fragment > Tx Buffer size\n"); 521 return -EFAULT; 522 } 523 524 constituents->address = sg_phys(args->sg); 525 constituents->pg_cnt = args->sg->length / FFA_PAGE_SIZE; 526 constituents++; 527 frag_len += sizeof(struct ffa_mem_region_addr_range); 528 } while ((args->sg = sg_next(args->sg))); 529 530 return ffa_transmit_fragment(func_id, addr, buf_sz, frag_len, 531 length, &args->g_handle, first); 532 } 533 534 static int ffa_memory_ops(u32 func_id, struct ffa_mem_ops_args *args) 535 { 536 int ret; 537 void *buffer; 538 539 if (!args->use_txbuf) { 540 buffer = alloc_pages_exact(RXTX_BUFFER_SIZE, GFP_KERNEL); 541 if (!buffer) 542 return -ENOMEM; 543 } else { 544 buffer = drv_info->tx_buffer; 545 mutex_lock(&drv_info->tx_lock); 546 } 547 548 ret = ffa_setup_and_transmit(func_id, buffer, RXTX_BUFFER_SIZE, args); 549 550 if (args->use_txbuf) 551 mutex_unlock(&drv_info->tx_lock); 552 else 553 free_pages_exact(buffer, RXTX_BUFFER_SIZE); 554 555 return ret < 0 ? ret : 0; 556 } 557 558 static int ffa_memory_reclaim(u64 g_handle, u32 flags) 559 { 560 ffa_value_t ret; 561 562 invoke_ffa_fn((ffa_value_t){ 563 .a0 = FFA_MEM_RECLAIM, 564 .a1 = HANDLE_LOW(g_handle), .a2 = HANDLE_HIGH(g_handle), 565 .a3 = flags, 566 }, &ret); 567 568 if (ret.a0 == FFA_ERROR) 569 return ffa_to_linux_errno((int)ret.a2); 570 571 return 0; 572 } 573 574 static u32 ffa_api_version_get(void) 575 { 576 return drv_info->version; 577 } 578 579 static int ffa_partition_info_get(const char *uuid_str, 580 struct ffa_partition_info *buffer) 581 { 582 int count; 583 uuid_t uuid; 584 struct ffa_partition_info *pbuf; 585 586 if (uuid_parse(uuid_str, &uuid)) { 587 pr_err("invalid uuid (%s)\n", uuid_str); 588 return -ENODEV; 589 } 590 591 count = ffa_partition_probe(&uuid, &pbuf); 592 if (count <= 0) 593 return -ENOENT; 594 595 memcpy(buffer, pbuf, sizeof(*pbuf) * count); 596 kfree(pbuf); 597 return 0; 598 } 599 600 static void ffa_mode_32bit_set(struct ffa_device *dev) 601 { 602 dev->mode_32bit = true; 603 } 604 605 static int ffa_sync_send_receive(struct ffa_device *dev, 606 struct ffa_send_direct_data *data) 607 { 608 return ffa_msg_send_direct_req(drv_info->vm_id, dev->vm_id, 609 dev->mode_32bit, data); 610 } 611 612 static int 613 ffa_memory_share(struct ffa_device *dev, struct ffa_mem_ops_args *args) 614 { 615 if (dev->mode_32bit) 616 return ffa_memory_ops(FFA_MEM_SHARE, args); 617 618 return ffa_memory_ops(FFA_FN_NATIVE(MEM_SHARE), args); 619 } 620 621 static int 622 ffa_memory_lend(struct ffa_device *dev, struct ffa_mem_ops_args *args) 623 { 624 /* Note that upon a successful MEM_LEND request the caller 625 * must ensure that the memory region specified is not accessed 626 * until a successful MEM_RECALIM call has been made. 627 * On systems with a hypervisor present this will been enforced, 628 * however on systems without a hypervisor the responsibility 629 * falls to the calling kernel driver to prevent access. 630 */ 631 if (dev->mode_32bit) 632 return ffa_memory_ops(FFA_MEM_LEND, args); 633 634 return ffa_memory_ops(FFA_FN_NATIVE(MEM_LEND), args); 635 } 636 637 static const struct ffa_dev_ops ffa_ops = { 638 .api_version_get = ffa_api_version_get, 639 .partition_info_get = ffa_partition_info_get, 640 .mode_32bit_set = ffa_mode_32bit_set, 641 .sync_send_receive = ffa_sync_send_receive, 642 .memory_reclaim = ffa_memory_reclaim, 643 .memory_share = ffa_memory_share, 644 .memory_lend = ffa_memory_lend, 645 }; 646 647 const struct ffa_dev_ops *ffa_dev_ops_get(struct ffa_device *dev) 648 { 649 if (ffa_device_is_valid(dev)) 650 return &ffa_ops; 651 652 return NULL; 653 } 654 EXPORT_SYMBOL_GPL(ffa_dev_ops_get); 655 656 void ffa_device_match_uuid(struct ffa_device *ffa_dev, const uuid_t *uuid) 657 { 658 int count, idx; 659 struct ffa_partition_info *pbuf, *tpbuf; 660 661 count = ffa_partition_probe(uuid, &pbuf); 662 if (count <= 0) 663 return; 664 665 for (idx = 0, tpbuf = pbuf; idx < count; idx++, tpbuf++) 666 if (tpbuf->id == ffa_dev->vm_id) 667 uuid_copy(&ffa_dev->uuid, uuid); 668 kfree(pbuf); 669 } 670 671 static void ffa_setup_partitions(void) 672 { 673 int count, idx; 674 struct ffa_device *ffa_dev; 675 struct ffa_partition_info *pbuf, *tpbuf; 676 677 count = ffa_partition_probe(&uuid_null, &pbuf); 678 if (count <= 0) { 679 pr_info("%s: No partitions found, error %d\n", __func__, count); 680 return; 681 } 682 683 for (idx = 0, tpbuf = pbuf; idx < count; idx++, tpbuf++) { 684 /* Note that the &uuid_null parameter will require 685 * ffa_device_match() to find the UUID of this partition id 686 * with help of ffa_device_match_uuid(). Once the FF-A spec 687 * is updated to provide correct UUID here for each partition 688 * as part of the discovery API, we need to pass the 689 * discovered UUID here instead. 690 */ 691 ffa_dev = ffa_device_register(&uuid_null, tpbuf->id, &ffa_ops); 692 if (!ffa_dev) { 693 pr_err("%s: failed to register partition ID 0x%x\n", 694 __func__, tpbuf->id); 695 continue; 696 } 697 } 698 kfree(pbuf); 699 } 700 701 static int __init ffa_init(void) 702 { 703 int ret; 704 705 ret = ffa_transport_init(&invoke_ffa_fn); 706 if (ret) 707 return ret; 708 709 ret = arm_ffa_bus_init(); 710 if (ret) 711 return ret; 712 713 drv_info = kzalloc(sizeof(*drv_info), GFP_KERNEL); 714 if (!drv_info) { 715 ret = -ENOMEM; 716 goto ffa_bus_exit; 717 } 718 719 ret = ffa_version_check(&drv_info->version); 720 if (ret) 721 goto free_drv_info; 722 723 if (ffa_id_get(&drv_info->vm_id)) { 724 pr_err("failed to obtain VM id for self\n"); 725 ret = -ENODEV; 726 goto free_drv_info; 727 } 728 729 drv_info->rx_buffer = alloc_pages_exact(RXTX_BUFFER_SIZE, GFP_KERNEL); 730 if (!drv_info->rx_buffer) { 731 ret = -ENOMEM; 732 goto free_pages; 733 } 734 735 drv_info->tx_buffer = alloc_pages_exact(RXTX_BUFFER_SIZE, GFP_KERNEL); 736 if (!drv_info->tx_buffer) { 737 ret = -ENOMEM; 738 goto free_pages; 739 } 740 741 ret = ffa_rxtx_map(virt_to_phys(drv_info->tx_buffer), 742 virt_to_phys(drv_info->rx_buffer), 743 RXTX_BUFFER_SIZE / FFA_PAGE_SIZE); 744 if (ret) { 745 pr_err("failed to register FFA RxTx buffers\n"); 746 goto free_pages; 747 } 748 749 mutex_init(&drv_info->rx_lock); 750 mutex_init(&drv_info->tx_lock); 751 752 ffa_setup_partitions(); 753 754 return 0; 755 free_pages: 756 if (drv_info->tx_buffer) 757 free_pages_exact(drv_info->tx_buffer, RXTX_BUFFER_SIZE); 758 free_pages_exact(drv_info->rx_buffer, RXTX_BUFFER_SIZE); 759 free_drv_info: 760 kfree(drv_info); 761 ffa_bus_exit: 762 arm_ffa_bus_exit(); 763 return ret; 764 } 765 subsys_initcall(ffa_init); 766 767 static void __exit ffa_exit(void) 768 { 769 ffa_rxtx_unmap(drv_info->vm_id); 770 free_pages_exact(drv_info->tx_buffer, RXTX_BUFFER_SIZE); 771 free_pages_exact(drv_info->rx_buffer, RXTX_BUFFER_SIZE); 772 kfree(drv_info); 773 arm_ffa_bus_exit(); 774 } 775 module_exit(ffa_exit); 776 777 MODULE_ALIAS("arm-ffa"); 778 MODULE_AUTHOR("Sudeep Holla <sudeep.holla@arm.com>"); 779 MODULE_DESCRIPTION("Arm FF-A interface driver"); 780 MODULE_LICENSE("GPL v2"); 781