git.itanic.dy.fi Git - linux-stable/blob - 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/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 #define FFA_MIN_VERSION         FFA_VERSION_1_0
  40
  41 #define SENDER_ID_MASK          GENMASK(31, 16)
  42 #define RECEIVER_ID_MASK        GENMASK(15, 0)
  43 #define SENDER_ID(x)            ((u16)(FIELD_GET(SENDER_ID_MASK, (x))))
  44 #define RECEIVER_ID(x)          ((u16)(FIELD_GET(RECEIVER_ID_MASK, (x))))
  45 #define PACK_TARGET_INFO(s, r)          \
  46         (FIELD_PREP(SENDER_ID_MASK, (s)) | FIELD_PREP(RECEIVER_ID_MASK, (r)))
  47
  48 /*
  49  * Keeping RX TX buffer size as 4K for now
  50  * 64K may be preferred to keep it min a page in 64K PAGE_SIZE config
  51  */
  52 #define RXTX_BUFFER_SIZE        SZ_4K
  53
  54 static ffa_fn *invoke_ffa_fn;
  55
  56 static const int ffa_linux_errmap[] = {
  57         /* better than switch case as long as return value is continuous */
  58         0,              /* FFA_RET_SUCCESS */
  59         -EOPNOTSUPP,    /* FFA_RET_NOT_SUPPORTED */
  60         -EINVAL,        /* FFA_RET_INVALID_PARAMETERS */
  61         -ENOMEM,        /* FFA_RET_NO_MEMORY */
  62         -EBUSY,         /* FFA_RET_BUSY */
  63         -EINTR,         /* FFA_RET_INTERRUPTED */
  64         -EACCES,        /* FFA_RET_DENIED */
  65         -EAGAIN,        /* FFA_RET_RETRY */
  66         -ECANCELED,     /* FFA_RET_ABORTED */
  67 };
  68
  69 static inline int ffa_to_linux_errno(int errno)
  70 {
  71         int err_idx = -errno;
  72
  73         if (err_idx >= 0 && err_idx < ARRAY_SIZE(ffa_linux_errmap))
  74                 return ffa_linux_errmap[err_idx];
  75         return -EINVAL;
  76 }
  77
  78 struct ffa_drv_info {
  79         u32 version;
  80         u16 vm_id;
  81         struct mutex rx_lock; /* lock to protect Rx buffer */
  82         struct mutex tx_lock; /* lock to protect Tx buffer */
  83         void *rx_buffer;
  84         void *tx_buffer;
  85         bool mem_ops_native;
  86 };
  87
  88 static struct ffa_drv_info *drv_info;
  89
  90 /*
  91  * The driver must be able to support all the versions from the earliest
  92  * supported FFA_MIN_VERSION to the latest supported FFA_DRIVER_VERSION.
  93  * The specification states that if firmware supports a FFA implementation
  94  * that is incompatible with and at a greater version number than specified
  95  * by the caller(FFA_DRIVER_VERSION passed as parameter to FFA_VERSION),
  96  * it must return the NOT_SUPPORTED error code.
  97  */
  98 static u32 ffa_compatible_version_find(u32 version)
  99 {
 100         u16 major = FFA_MAJOR_VERSION(version), minor = FFA_MINOR_VERSION(version);
 101         u16 drv_major = FFA_MAJOR_VERSION(FFA_DRIVER_VERSION);
 102         u16 drv_minor = FFA_MINOR_VERSION(FFA_DRIVER_VERSION);
 103
 104         if ((major < drv_major) || (major == drv_major && minor <= drv_minor))
 105                 return version;
 106
 107         pr_info("Firmware version higher than driver version, downgrading\n");
 108         return FFA_DRIVER_VERSION;
 109 }
 110
 111 static int ffa_version_check(u32 *version)
 112 {
 113         ffa_value_t ver;
 114
 115         invoke_ffa_fn((ffa_value_t){
 116                       .a0 = FFA_VERSION, .a1 = FFA_DRIVER_VERSION,
 117                       }, &ver);
 118
 119         if (ver.a0 == FFA_RET_NOT_SUPPORTED) {
 120                 pr_info("FFA_VERSION returned not supported\n");
 121                 return -EOPNOTSUPP;
 122         }
 123
 124         if (ver.a0 < FFA_MIN_VERSION) {
 125                 pr_err("Incompatible v%d.%d! Earliest supported v%d.%d\n",
 126                        FFA_MAJOR_VERSION(ver.a0), FFA_MINOR_VERSION(ver.a0),
 127                        FFA_MAJOR_VERSION(FFA_MIN_VERSION),
 128                        FFA_MINOR_VERSION(FFA_MIN_VERSION));
 129                 return -EINVAL;
 130         }
 131
 132         pr_info("Driver version %d.%d\n", FFA_MAJOR_VERSION(FFA_DRIVER_VERSION),
 133                 FFA_MINOR_VERSION(FFA_DRIVER_VERSION));
 134         pr_info("Firmware version %d.%d found\n", FFA_MAJOR_VERSION(ver.a0),
 135                 FFA_MINOR_VERSION(ver.a0));
 136         *version = ffa_compatible_version_find(ver.a0);
 137
 138         return 0;
 139 }
 140
 141 static int ffa_rx_release(void)
 142 {
 143         ffa_value_t ret;
 144
 145         invoke_ffa_fn((ffa_value_t){
 146                       .a0 = FFA_RX_RELEASE,
 147                       }, &ret);
 148
 149         if (ret.a0 == FFA_ERROR)
 150                 return ffa_to_linux_errno((int)ret.a2);
 151
 152         /* check for ret.a0 == FFA_RX_RELEASE ? */
 153
 154         return 0;
 155 }
 156
 157 static int ffa_rxtx_map(phys_addr_t tx_buf, phys_addr_t rx_buf, u32 pg_cnt)
 158 {
 159         ffa_value_t ret;
 160
 161         invoke_ffa_fn((ffa_value_t){
 162                       .a0 = FFA_FN_NATIVE(RXTX_MAP),
 163                       .a1 = tx_buf, .a2 = rx_buf, .a3 = pg_cnt,
 164                       }, &ret);
 165
 166         if (ret.a0 == FFA_ERROR)
 167                 return ffa_to_linux_errno((int)ret.a2);
 168
 169         return 0;
 170 }
 171
 172 static int ffa_rxtx_unmap(u16 vm_id)
 173 {
 174         ffa_value_t ret;
 175
 176         invoke_ffa_fn((ffa_value_t){
 177                       .a0 = FFA_RXTX_UNMAP, .a1 = PACK_TARGET_INFO(vm_id, 0),
 178                       }, &ret);
 179
 180         if (ret.a0 == FFA_ERROR)
 181                 return ffa_to_linux_errno((int)ret.a2);
 182
 183         return 0;
 184 }
 185
 186 #define PARTITION_INFO_GET_RETURN_COUNT_ONLY    BIT(0)
 187
 188 /* buffer must be sizeof(struct ffa_partition_info) * num_partitions */
 189 static int
 190 __ffa_partition_info_get(u32 uuid0, u32 uuid1, u32 uuid2, u32 uuid3,
 191                          struct ffa_partition_info *buffer, int num_partitions)
 192 {
 193         int idx, count, flags = 0, sz, buf_sz;
 194         ffa_value_t partition_info;
 195
 196         if (!buffer || !num_partitions) /* Just get the count for now */
 197                 flags = PARTITION_INFO_GET_RETURN_COUNT_ONLY;
 198
 199         mutex_lock(&drv_info->rx_lock);
 200         invoke_ffa_fn((ffa_value_t){
 201                       .a0 = FFA_PARTITION_INFO_GET,
 202                       .a1 = uuid0, .a2 = uuid1, .a3 = uuid2, .a4 = uuid3,
 203                       .a5 = flags,
 204                       }, &partition_info);
 205
 206         if (partition_info.a0 == FFA_ERROR) {
 207                 mutex_unlock(&drv_info->rx_lock);
 208                 return ffa_to_linux_errno((int)partition_info.a2);
 209         }
 210
 211         count = partition_info.a2;
 212
 213         if (drv_info->version > FFA_VERSION_1_0) {
 214                 buf_sz = sz = partition_info.a3;
 215                 if (sz > sizeof(*buffer))
 216                         buf_sz = sizeof(*buffer);
 217         } else {
 218                 /* FFA_VERSION_1_0 lacks size in the response */
 219                 buf_sz = sz = 8;
 220         }
 221
 222         if (buffer && count <= num_partitions)
 223                 for (idx = 0; idx < count; idx++)
 224                         memcpy(buffer + idx, drv_info->rx_buffer + idx * sz,
 225                                buf_sz);
 226
 227         ffa_rx_release();
 228
 229         mutex_unlock(&drv_info->rx_lock);
 230
 231         return count;
 232 }
 233
 234 /* buffer is allocated and caller must free the same if returned count > 0 */
 235 static int
 236 ffa_partition_probe(const uuid_t *uuid, struct ffa_partition_info **buffer)
 237 {
 238         int count;
 239         u32 uuid0_4[4];
 240         struct ffa_partition_info *pbuf;
 241
 242         export_uuid((u8 *)uuid0_4, uuid);
 243         count = __ffa_partition_info_get(uuid0_4[0], uuid0_4[1], uuid0_4[2],
 244                                          uuid0_4[3], NULL, 0);
 245         if (count <= 0)
 246                 return count;
 247
 248         pbuf = kcalloc(count, sizeof(*pbuf), GFP_KERNEL);
 249         if (!pbuf)
 250                 return -ENOMEM;
 251
 252         count = __ffa_partition_info_get(uuid0_4[0], uuid0_4[1], uuid0_4[2],
 253                                          uuid0_4[3], pbuf, count);
 254         if (count <= 0)
 255                 kfree(pbuf);
 256         else
 257                 *buffer = pbuf;
 258
 259         return count;
 260 }
 261
 262 #define VM_ID_MASK      GENMASK(15, 0)
 263 static int ffa_id_get(u16 *vm_id)
 264 {
 265         ffa_value_t id;
 266
 267         invoke_ffa_fn((ffa_value_t){
 268                       .a0 = FFA_ID_GET,
 269                       }, &id);
 270
 271         if (id.a0 == FFA_ERROR)
 272                 return ffa_to_linux_errno((int)id.a2);
 273
 274         *vm_id = FIELD_GET(VM_ID_MASK, (id.a2));
 275
 276         return 0;
 277 }
 278
 279 static int ffa_msg_send_direct_req(u16 src_id, u16 dst_id, bool mode_32bit,
 280                                    struct ffa_send_direct_data *data)
 281 {
 282         u32 req_id, resp_id, src_dst_ids = PACK_TARGET_INFO(src_id, dst_id);
 283         ffa_value_t ret;
 284
 285         if (mode_32bit) {
 286                 req_id = FFA_MSG_SEND_DIRECT_REQ;
 287                 resp_id = FFA_MSG_SEND_DIRECT_RESP;
 288         } else {
 289                 req_id = FFA_FN_NATIVE(MSG_SEND_DIRECT_REQ);
 290                 resp_id = FFA_FN_NATIVE(MSG_SEND_DIRECT_RESP);
 291         }
 292
 293         invoke_ffa_fn((ffa_value_t){
 294                       .a0 = req_id, .a1 = src_dst_ids, .a2 = 0,
 295                       .a3 = data->data0, .a4 = data->data1, .a5 = data->data2,
 296                       .a6 = data->data3, .a7 = data->data4,
 297                       }, &ret);
 298
 299         while (ret.a0 == FFA_INTERRUPT)
 300                 invoke_ffa_fn((ffa_value_t){
 301                               .a0 = FFA_RUN, .a1 = ret.a1,
 302                               }, &ret);
 303
 304         if (ret.a0 == FFA_ERROR)
 305                 return ffa_to_linux_errno((int)ret.a2);
 306
 307         if (ret.a0 == resp_id) {
 308                 data->data0 = ret.a3;
 309                 data->data1 = ret.a4;
 310                 data->data2 = ret.a5;
 311                 data->data3 = ret.a6;
 312                 data->data4 = ret.a7;
 313                 return 0;
 314         }
 315
 316         return -EINVAL;
 317 }
 318
 319 static int ffa_mem_first_frag(u32 func_id, phys_addr_t buf, u32 buf_sz,
 320                               u32 frag_len, u32 len, u64 *handle)
 321 {
 322         ffa_value_t ret;
 323
 324         invoke_ffa_fn((ffa_value_t){
 325                       .a0 = func_id, .a1 = len, .a2 = frag_len,
 326                       .a3 = buf, .a4 = buf_sz,
 327                       }, &ret);
 328
 329         while (ret.a0 == FFA_MEM_OP_PAUSE)
 330                 invoke_ffa_fn((ffa_value_t){
 331                               .a0 = FFA_MEM_OP_RESUME,
 332                               .a1 = ret.a1, .a2 = ret.a2,
 333                               }, &ret);
 334
 335         if (ret.a0 == FFA_ERROR)
 336                 return ffa_to_linux_errno((int)ret.a2);
 337
 338         if (ret.a0 == FFA_SUCCESS) {
 339                 if (handle)
 340                         *handle = PACK_HANDLE(ret.a2, ret.a3);
 341         } else if (ret.a0 == FFA_MEM_FRAG_RX) {
 342                 if (handle)
 343                         *handle = PACK_HANDLE(ret.a1, ret.a2);
 344         } else {
 345                 return -EOPNOTSUPP;
 346         }
 347
 348         return frag_len;
 349 }
 350
 351 static int ffa_mem_next_frag(u64 handle, u32 frag_len)
 352 {
 353         ffa_value_t ret;
 354
 355         invoke_ffa_fn((ffa_value_t){
 356                       .a0 = FFA_MEM_FRAG_TX,
 357                       .a1 = HANDLE_LOW(handle), .a2 = HANDLE_HIGH(handle),
 358                       .a3 = frag_len,
 359                       }, &ret);
 360
 361         while (ret.a0 == FFA_MEM_OP_PAUSE)
 362                 invoke_ffa_fn((ffa_value_t){
 363                               .a0 = FFA_MEM_OP_RESUME,
 364                               .a1 = ret.a1, .a2 = ret.a2,
 365                               }, &ret);
 366
 367         if (ret.a0 == FFA_ERROR)
 368                 return ffa_to_linux_errno((int)ret.a2);
 369
 370         if (ret.a0 == FFA_MEM_FRAG_RX)
 371                 return ret.a3;
 372         else if (ret.a0 == FFA_SUCCESS)
 373                 return 0;
 374
 375         return -EOPNOTSUPP;
 376 }
 377
 378 static int
 379 ffa_transmit_fragment(u32 func_id, phys_addr_t buf, u32 buf_sz, u32 frag_len,
 380                       u32 len, u64 *handle, bool first)
 381 {
 382         if (!first)
 383                 return ffa_mem_next_frag(*handle, frag_len);
 384
 385         return ffa_mem_first_frag(func_id, buf, buf_sz, frag_len, len, handle);
 386 }
 387
 388 static u32 ffa_get_num_pages_sg(struct scatterlist *sg)
 389 {
 390         u32 num_pages = 0;
 391
 392         do {
 393                 num_pages += sg->length / FFA_PAGE_SIZE;
 394         } while ((sg = sg_next(sg)));
 395
 396         return num_pages;
 397 }
 398
 399 static int
 400 ffa_setup_and_transmit(u32 func_id, void *buffer, u32 max_fragsize,
 401                        struct ffa_mem_ops_args *args)
 402 {
 403         int rc = 0;
 404         bool first = true;
 405         phys_addr_t addr = 0;
 406         struct ffa_composite_mem_region *composite;
 407         struct ffa_mem_region_addr_range *constituents;
 408         struct ffa_mem_region_attributes *ep_mem_access;
 409         struct ffa_mem_region *mem_region = buffer;
 410         u32 idx, frag_len, length, buf_sz = 0, num_entries = sg_nents(args->sg);
 411
 412         mem_region->tag = args->tag;
 413         mem_region->flags = args->flags;
 414         mem_region->sender_id = drv_info->vm_id;
 415         mem_region->attributes = FFA_MEM_NORMAL | FFA_MEM_WRITE_BACK |
 416                                  FFA_MEM_INNER_SHAREABLE;
 417         ep_mem_access = &mem_region->ep_mem_access[0];
 418
 419         for (idx = 0; idx < args->nattrs; idx++, ep_mem_access++) {
 420                 ep_mem_access->receiver = args->attrs[idx].receiver;
 421                 ep_mem_access->attrs = args->attrs[idx].attrs;
 422                 ep_mem_access->composite_off = COMPOSITE_OFFSET(args->nattrs);
 423                 ep_mem_access->flag = 0;
 424                 ep_mem_access->reserved = 0;
 425         }
 426         mem_region->reserved_0 = 0;
 427         mem_region->reserved_1 = 0;
 428         mem_region->ep_count = args->nattrs;
 429
 430         composite = buffer + COMPOSITE_OFFSET(args->nattrs);
 431         composite->total_pg_cnt = ffa_get_num_pages_sg(args->sg);
 432         composite->addr_range_cnt = num_entries;
 433         composite->reserved = 0;
 434
 435         length = COMPOSITE_CONSTITUENTS_OFFSET(args->nattrs, num_entries);
 436         frag_len = COMPOSITE_CONSTITUENTS_OFFSET(args->nattrs, 0);
 437         if (frag_len > max_fragsize)
 438                 return -ENXIO;
 439
 440         if (!args->use_txbuf) {
 441                 addr = virt_to_phys(buffer);
 442                 buf_sz = max_fragsize / FFA_PAGE_SIZE;
 443         }
 444
 445         constituents = buffer + frag_len;
 446         idx = 0;
 447         do {
 448                 if (frag_len == max_fragsize) {
 449                         rc = ffa_transmit_fragment(func_id, addr, buf_sz,
 450                                                    frag_len, length,
 451                                                    &args->g_handle, first);
 452                         if (rc < 0)
 453                                 return -ENXIO;
 454
 455                         first = false;
 456                         idx = 0;
 457                         frag_len = 0;
 458                         constituents = buffer;
 459                 }
 460
 461                 if ((void *)constituents - buffer > max_fragsize) {
 462                         pr_err("Memory Region Fragment > Tx Buffer size\n");
 463                         return -EFAULT;
 464                 }
 465
 466                 constituents->address = sg_phys(args->sg);
 467                 constituents->pg_cnt = args->sg->length / FFA_PAGE_SIZE;
 468                 constituents->reserved = 0;
 469                 constituents++;
 470                 frag_len += sizeof(struct ffa_mem_region_addr_range);
 471         } while ((args->sg = sg_next(args->sg)));
 472
 473         return ffa_transmit_fragment(func_id, addr, buf_sz, frag_len,
 474                                      length, &args->g_handle, first);
 475 }
 476
 477 static int ffa_memory_ops(u32 func_id, struct ffa_mem_ops_args *args)
 478 {
 479         int ret;
 480         void *buffer;
 481
 482         if (!args->use_txbuf) {
 483                 buffer = alloc_pages_exact(RXTX_BUFFER_SIZE, GFP_KERNEL);
 484                 if (!buffer)
 485                         return -ENOMEM;
 486         } else {
 487                 buffer = drv_info->tx_buffer;
 488                 mutex_lock(&drv_info->tx_lock);
 489         }
 490
 491         ret = ffa_setup_and_transmit(func_id, buffer, RXTX_BUFFER_SIZE, args);
 492
 493         if (args->use_txbuf)
 494                 mutex_unlock(&drv_info->tx_lock);
 495         else
 496                 free_pages_exact(buffer, RXTX_BUFFER_SIZE);
 497
 498         return ret < 0 ? ret : 0;
 499 }
 500
 501 static int ffa_memory_reclaim(u64 g_handle, u32 flags)
 502 {
 503         ffa_value_t ret;
 504
 505         invoke_ffa_fn((ffa_value_t){
 506                       .a0 = FFA_MEM_RECLAIM,
 507                       .a1 = HANDLE_LOW(g_handle), .a2 = HANDLE_HIGH(g_handle),
 508                       .a3 = flags,
 509                       }, &ret);
 510
 511         if (ret.a0 == FFA_ERROR)
 512                 return ffa_to_linux_errno((int)ret.a2);
 513
 514         return 0;
 515 }
 516
 517 static int ffa_features(u32 func_feat_id, u32 input_props,
 518                         u32 *if_props_1, u32 *if_props_2)
 519 {
 520         ffa_value_t id;
 521
 522         if (!ARM_SMCCC_IS_FAST_CALL(func_feat_id) && input_props) {
 523                 pr_err("%s: Invalid Parameters: %x, %x", __func__,
 524                        func_feat_id, input_props);
 525                 return ffa_to_linux_errno(FFA_RET_INVALID_PARAMETERS);
 526         }
 527
 528         invoke_ffa_fn((ffa_value_t){
 529                 .a0 = FFA_FEATURES, .a1 = func_feat_id, .a2 = input_props,
 530                 }, &id);
 531
 532         if (id.a0 == FFA_ERROR)
 533                 return ffa_to_linux_errno((int)id.a2);
 534
 535         if (if_props_1)
 536                 *if_props_1 = id.a2;
 537         if (if_props_2)
 538                 *if_props_2 = id.a3;
 539
 540         return 0;
 541 }
 542
 543 static void ffa_set_up_mem_ops_native_flag(void)
 544 {
 545         if (!ffa_features(FFA_FN_NATIVE(MEM_LEND), 0, NULL, NULL) ||
 546             !ffa_features(FFA_FN_NATIVE(MEM_SHARE), 0, NULL, NULL))
 547                 drv_info->mem_ops_native = true;
 548 }
 549
 550 static u32 ffa_api_version_get(void)
 551 {
 552         return drv_info->version;
 553 }
 554
 555 static int ffa_partition_info_get(const char *uuid_str,
 556                                   struct ffa_partition_info *buffer)
 557 {
 558         int count;
 559         uuid_t uuid;
 560         struct ffa_partition_info *pbuf;
 561
 562         if (uuid_parse(uuid_str, &uuid)) {
 563                 pr_err("invalid uuid (%s)\n", uuid_str);
 564                 return -ENODEV;
 565         }
 566
 567         count = ffa_partition_probe(&uuid, &pbuf);
 568         if (count <= 0)
 569                 return -ENOENT;
 570
 571         memcpy(buffer, pbuf, sizeof(*pbuf) * count);
 572         kfree(pbuf);
 573         return 0;
 574 }
 575
 576 static void _ffa_mode_32bit_set(struct ffa_device *dev)
 577 {
 578         dev->mode_32bit = true;
 579 }
 580
 581 static void ffa_mode_32bit_set(struct ffa_device *dev)
 582 {
 583         if (drv_info->version > FFA_VERSION_1_0)
 584                 return;
 585
 586         _ffa_mode_32bit_set(dev);
 587 }
 588
 589 static int ffa_sync_send_receive(struct ffa_device *dev,
 590                                  struct ffa_send_direct_data *data)
 591 {
 592         return ffa_msg_send_direct_req(drv_info->vm_id, dev->vm_id,
 593                                        dev->mode_32bit, data);
 594 }
 595
 596 static int ffa_memory_share(struct ffa_mem_ops_args *args)
 597 {
 598         if (drv_info->mem_ops_native)
 599                 return ffa_memory_ops(FFA_FN_NATIVE(MEM_SHARE), args);
 600
 601         return ffa_memory_ops(FFA_MEM_SHARE, args);
 602 }
 603
 604 static int ffa_memory_lend(struct ffa_mem_ops_args *args)
 605 {
 606         /* Note that upon a successful MEM_LEND request the caller
 607          * must ensure that the memory region specified is not accessed
 608          * until a successful MEM_RECALIM call has been made.
 609          * On systems with a hypervisor present this will been enforced,
 610          * however on systems without a hypervisor the responsibility
 611          * falls to the calling kernel driver to prevent access.
 612          */
 613         if (drv_info->mem_ops_native)
 614                 return ffa_memory_ops(FFA_FN_NATIVE(MEM_LEND), args);
 615
 616         return ffa_memory_ops(FFA_MEM_LEND, args);
 617 }
 618
 619 static const struct ffa_info_ops ffa_drv_info_ops = {
 620         .api_version_get = ffa_api_version_get,
 621         .partition_info_get = ffa_partition_info_get,
 622 };
 623
 624 static const struct ffa_msg_ops ffa_drv_msg_ops = {
 625         .mode_32bit_set = ffa_mode_32bit_set,
 626         .sync_send_receive = ffa_sync_send_receive,
 627 };
 628
 629 static const struct ffa_mem_ops ffa_drv_mem_ops = {
 630         .memory_reclaim = ffa_memory_reclaim,
 631         .memory_share = ffa_memory_share,
 632         .memory_lend = ffa_memory_lend,
 633 };
 634
 635 static const struct ffa_ops ffa_drv_ops = {
 636         .info_ops = &ffa_drv_info_ops,
 637         .msg_ops = &ffa_drv_msg_ops,
 638         .mem_ops = &ffa_drv_mem_ops,
 639 };
 640
 641 void ffa_device_match_uuid(struct ffa_device *ffa_dev, const uuid_t *uuid)
 642 {
 643         int count, idx;
 644         struct ffa_partition_info *pbuf, *tpbuf;
 645
 646         /*
 647          * FF-A v1.1 provides UUID for each partition as part of the discovery
 648          * API, the discovered UUID must be populated in the device's UUID and
 649          * there is no need to copy the same from the driver table.
 650          */
 651         if (drv_info->version > FFA_VERSION_1_0)
 652                 return;
 653
 654         count = ffa_partition_probe(uuid, &pbuf);
 655         if (count <= 0)
 656                 return;
 657
 658         for (idx = 0, tpbuf = pbuf; idx < count; idx++, tpbuf++)
 659                 if (tpbuf->id == ffa_dev->vm_id)
 660                         uuid_copy(&ffa_dev->uuid, uuid);
 661         kfree(pbuf);
 662 }
 663
 664 static void ffa_setup_partitions(void)
 665 {
 666         int count, idx;
 667         uuid_t uuid;
 668         struct ffa_device *ffa_dev;
 669         struct ffa_partition_info *pbuf, *tpbuf;
 670
 671         count = ffa_partition_probe(&uuid_null, &pbuf);
 672         if (count <= 0) {
 673                 pr_info("%s: No partitions found, error %d\n", __func__, count);
 674                 return;
 675         }
 676
 677         for (idx = 0, tpbuf = pbuf; idx < count; idx++, tpbuf++) {
 678                 import_uuid(&uuid, (u8 *)tpbuf->uuid);
 679
 680                 /* Note that if the UUID will be uuid_null, that will require
 681                  * ffa_device_match() to find the UUID of this partition id
 682                  * with help of ffa_device_match_uuid(). FF-A v1.1 and above
 683                  * provides UUID here for each partition as part of the
 684                  * discovery API and the same is passed.
 685                  */
 686                 ffa_dev = ffa_device_register(&uuid, tpbuf->id, &ffa_drv_ops);
 687                 if (!ffa_dev) {
 688                         pr_err("%s: failed to register partition ID 0x%x\n",
 689                                __func__, tpbuf->id);
 690                         continue;
 691                 }
 692
 693                 if (drv_info->version > FFA_VERSION_1_0 &&
 694                     !(tpbuf->properties & FFA_PARTITION_AARCH64_EXEC))
 695                         _ffa_mode_32bit_set(ffa_dev);
 696         }
 697         kfree(pbuf);
 698 }
 699
 700 static int __init ffa_init(void)
 701 {
 702         int ret;
 703
 704         ret = ffa_transport_init(&invoke_ffa_fn);
 705         if (ret)
 706                 return ret;
 707
 708         ret = arm_ffa_bus_init();
 709         if (ret)
 710                 return ret;
 711
 712         drv_info = kzalloc(sizeof(*drv_info), GFP_KERNEL);
 713         if (!drv_info) {
 714                 ret = -ENOMEM;
 715                 goto ffa_bus_exit;
 716         }
 717
 718         ret = ffa_version_check(&drv_info->version);
 719         if (ret)
 720                 goto free_drv_info;
 721
 722         if (ffa_id_get(&drv_info->vm_id)) {
 723                 pr_err("failed to obtain VM id for self\n");
 724                 ret = -ENODEV;
 725                 goto free_drv_info;
 726         }
 727
 728         drv_info->rx_buffer = alloc_pages_exact(RXTX_BUFFER_SIZE, GFP_KERNEL);
 729         if (!drv_info->rx_buffer) {
 730                 ret = -ENOMEM;
 731                 goto free_pages;
 732         }
 733
 734         drv_info->tx_buffer = alloc_pages_exact(RXTX_BUFFER_SIZE, GFP_KERNEL);
 735         if (!drv_info->tx_buffer) {
 736                 ret = -ENOMEM;
 737                 goto free_pages;
 738         }
 739
 740         ret = ffa_rxtx_map(virt_to_phys(drv_info->tx_buffer),
 741                            virt_to_phys(drv_info->rx_buffer),
 742                            RXTX_BUFFER_SIZE / FFA_PAGE_SIZE);
 743         if (ret) {
 744                 pr_err("failed to register FFA RxTx buffers\n");
 745                 goto free_pages;
 746         }
 747
 748         mutex_init(&drv_info->rx_lock);
 749         mutex_init(&drv_info->tx_lock);
 750
 751         ffa_setup_partitions();
 752
 753         ffa_set_up_mem_ops_native_flag();
 754
 755         return 0;
 756 free_pages:
 757         if (drv_info->tx_buffer)
 758                 free_pages_exact(drv_info->tx_buffer, RXTX_BUFFER_SIZE);
 759         free_pages_exact(drv_info->rx_buffer, RXTX_BUFFER_SIZE);
 760 free_drv_info:
 761         kfree(drv_info);
 762 ffa_bus_exit:
 763         arm_ffa_bus_exit();
 764         return ret;
 765 }
 766 subsys_initcall(ffa_init);
 767
 768 static void __exit ffa_exit(void)
 769 {
 770         ffa_rxtx_unmap(drv_info->vm_id);
 771         free_pages_exact(drv_info->tx_buffer, RXTX_BUFFER_SIZE);
 772         free_pages_exact(drv_info->rx_buffer, RXTX_BUFFER_SIZE);
 773         kfree(drv_info);
 774         arm_ffa_bus_exit();
 775 }
 776 module_exit(ffa_exit);
 777
 778 MODULE_ALIAS("arm-ffa");
 779 MODULE_AUTHOR("Sudeep Holla <sudeep.holla@arm.com>");
 780 MODULE_DESCRIPTION("Arm FF-A interface driver");
 781 MODULE_LICENSE("GPL v2");