drivers/misc/fastrpc.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 // Copyright (c) 2011-2018, The Linux Foundation. All rights reserved.
   3 // Copyright (c) 2018, Linaro Limited
   4
   5 #include <linux/completion.h>
   6 #include <linux/device.h>
   7 #include <linux/dma-buf.h>
   8 #include <linux/dma-mapping.h>
   9 #include <linux/idr.h>
  10 #include <linux/list.h>
  11 #include <linux/miscdevice.h>
  12 #include <linux/module.h>
  13 #include <linux/of_address.h>
  14 #include <linux/of.h>
  15 #include <linux/of_platform.h>
  16 #include <linux/rpmsg.h>
  17 #include <linux/scatterlist.h>
  18 #include <linux/slab.h>
  19 #include <uapi/misc/fastrpc.h>
  20
  21 #define ADSP_DOMAIN_ID (0)
  22 #define MDSP_DOMAIN_ID (1)
  23 #define SDSP_DOMAIN_ID (2)
  24 #define CDSP_DOMAIN_ID (3)
  25 #define FASTRPC_DEV_MAX         4 /* adsp, mdsp, slpi, cdsp*/
  26 #define FASTRPC_MAX_SESSIONS    9 /*8 compute, 1 cpz*/
  27 #define FASTRPC_ALIGN           128
  28 #define FASTRPC_MAX_FDLIST      16
  29 #define FASTRPC_MAX_CRCLIST     64
  30 #define FASTRPC_PHYS(p) ((p) & 0xffffffff)
  31 #define FASTRPC_CTX_MAX (256)
  32 #define FASTRPC_INIT_HANDLE     1
  33 #define FASTRPC_CTXID_MASK (0xFF0)
  34 #define INIT_FILELEN_MAX (2 * 1024 * 1024)
  35 #define INIT_MEMLEN_MAX  (8 * 1024 * 1024)
  36 #define FASTRPC_DEVICE_NAME     "fastrpc"
  37
  38 /* Retrives number of input buffers from the scalars parameter */
  39 #define REMOTE_SCALARS_INBUFS(sc)       (((sc) >> 16) & 0x0ff)
  40
  41 /* Retrives number of output buffers from the scalars parameter */
  42 #define REMOTE_SCALARS_OUTBUFS(sc)      (((sc) >> 8) & 0x0ff)
  43
  44 /* Retrives number of input handles from the scalars parameter */
  45 #define REMOTE_SCALARS_INHANDLES(sc)    (((sc) >> 4) & 0x0f)
  46
  47 /* Retrives number of output handles from the scalars parameter */
  48 #define REMOTE_SCALARS_OUTHANDLES(sc)   ((sc) & 0x0f)
  49
  50 #define REMOTE_SCALARS_LENGTH(sc)       (REMOTE_SCALARS_INBUFS(sc) +   \
  51                                          REMOTE_SCALARS_OUTBUFS(sc) +  \
  52                                          REMOTE_SCALARS_INHANDLES(sc)+ \
  53                                          REMOTE_SCALARS_OUTHANDLES(sc))
  54 #define FASTRPC_BUILD_SCALARS(attr, method, in, out, oin, oout)  \
  55                                 (((attr & 0x07) << 29) |                \
  56                                 ((method & 0x1f) << 24) |       \
  57                                 ((in & 0xff) << 16) |           \
  58                                 ((out & 0xff) <<  8) |          \
  59                                 ((oin & 0x0f) <<  4) |          \
  60                                 (oout & 0x0f))
  61
  62 #define FASTRPC_SCALARS(method, in, out) \
  63                 FASTRPC_BUILD_SCALARS(0, method, in, out, 0, 0)
  64
  65 #define FASTRPC_CREATE_PROCESS_NARGS    6
  66 /* Remote Method id table */
  67 #define FASTRPC_RMID_INIT_ATTACH        0
  68 #define FASTRPC_RMID_INIT_RELEASE       1
  69 #define FASTRPC_RMID_INIT_CREATE        6
  70 #define FASTRPC_RMID_INIT_CREATE_ATTR   7
  71 #define FASTRPC_RMID_INIT_CREATE_STATIC 8
  72
  73 #define miscdev_to_cctx(d) container_of(d, struct fastrpc_channel_ctx, miscdev)
  74
  75 static const char *domains[FASTRPC_DEV_MAX] = { "adsp", "mdsp",
  76                                                 "sdsp", "cdsp"};
  77 struct fastrpc_phy_page {
  78         u64 addr;               /* physical address */
  79         u64 size;               /* size of contiguous region */
  80 };
  81
  82 struct fastrpc_invoke_buf {
  83         u32 num;                /* number of contiguous regions */
  84         u32 pgidx;              /* index to start of contiguous region */
  85 };
  86
  87 struct fastrpc_remote_arg {
  88         u64 pv;
  89         u64 len;
  90 };
  91
  92 struct fastrpc_msg {
  93         int pid;                /* process group id */
  94         int tid;                /* thread id */
  95         u64 ctx;                /* invoke caller context */
  96         u32 handle;     /* handle to invoke */
  97         u32 sc;         /* scalars structure describing the data */
  98         u64 addr;               /* physical address */
  99         u64 size;               /* size of contiguous region */
 100 };
 101
 102 struct fastrpc_invoke_rsp {
 103         u64 ctx;                /* invoke caller context */
 104         int retval;             /* invoke return value */
 105 };
 106
 107 struct fastrpc_buf {
 108         struct fastrpc_user *fl;
 109         struct dma_buf *dmabuf;
 110         struct device *dev;
 111         void *virt;
 112         u64 phys;
 113         u64 size;
 114         /* Lock for dma buf attachments */
 115         struct mutex lock;
 116         struct list_head attachments;
 117 };
 118
 119 struct fastrpc_dma_buf_attachment {
 120         struct device *dev;
 121         struct sg_table sgt;
 122         struct list_head node;
 123 };
 124
 125 struct fastrpc_map {
 126         struct list_head node;
 127         struct fastrpc_user *fl;
 128         int fd;
 129         struct dma_buf *buf;
 130         struct sg_table *table;
 131         struct dma_buf_attachment *attach;
 132         u64 phys;
 133         u64 size;
 134         void *va;
 135         u64 len;
 136         struct kref refcount;
 137 };
 138
 139 struct fastrpc_invoke_ctx {
 140         int nscalars;
 141         int nbufs;
 142         int retval;
 143         int pid;
 144         int tgid;
 145         u32 sc;
 146         u32 *crc;
 147         u64 ctxid;
 148         u64 msg_sz;
 149         struct kref refcount;
 150         struct list_head node; /* list of ctxs */
 151         struct completion work;
 152         struct fastrpc_msg msg;
 153         struct fastrpc_user *fl;
 154         struct fastrpc_remote_arg *rpra;
 155         struct fastrpc_map **maps;
 156         struct fastrpc_buf *buf;
 157         struct fastrpc_invoke_args *args;
 158         struct fastrpc_channel_ctx *cctx;
 159 };
 160
 161 struct fastrpc_session_ctx {
 162         struct device *dev;
 163         int sid;
 164         bool used;
 165         bool valid;
 166 };
 167
 168 struct fastrpc_channel_ctx {
 169         int domain_id;
 170         int sesscount;
 171         struct rpmsg_device *rpdev;
 172         struct fastrpc_session_ctx session[FASTRPC_MAX_SESSIONS];
 173         spinlock_t lock;
 174         struct idr ctx_idr;
 175         struct list_head users;
 176         struct miscdevice miscdev;
 177 };
 178
 179 struct fastrpc_user {
 180         struct list_head user;
 181         struct list_head maps;
 182         struct list_head pending;
 183
 184         struct fastrpc_channel_ctx *cctx;
 185         struct fastrpc_session_ctx *sctx;
 186         struct fastrpc_buf *init_mem;
 187
 188         int tgid;
 189         int pd;
 190         /* Lock for lists */
 191         spinlock_t lock;
 192         /* lock for allocations */
 193         struct mutex mutex;
 194 };
 195
 196 static void fastrpc_free_map(struct kref *ref)
 197 {
 198         struct fastrpc_map *map;
 199
 200         map = container_of(ref, struct fastrpc_map, refcount);
 201
 202         if (map->table) {
 203                 dma_buf_unmap_attachment(map->attach, map->table,
 204                                          DMA_BIDIRECTIONAL);
 205                 dma_buf_detach(map->buf, map->attach);
 206                 dma_buf_put(map->buf);
 207         }
 208
 209         kfree(map);
 210 }
 211
 212 static void fastrpc_map_put(struct fastrpc_map *map)
 213 {
 214         if (map)
 215                 kref_put(&map->refcount, fastrpc_free_map);
 216 }
 217
 218 static void fastrpc_map_get(struct fastrpc_map *map)
 219 {
 220         if (map)
 221                 kref_get(&map->refcount);
 222 }
 223
 224 static int fastrpc_map_find(struct fastrpc_user *fl, int fd,
 225                             struct fastrpc_map **ppmap)
 226 {
 227         struct fastrpc_map *map = NULL;
 228
 229         mutex_lock(&fl->mutex);
 230         list_for_each_entry(map, &fl->maps, node) {
 231                 if (map->fd == fd) {
 232                         fastrpc_map_get(map);
 233                         *ppmap = map;
 234                         mutex_unlock(&fl->mutex);
 235                         return 0;
 236                 }
 237         }
 238         mutex_unlock(&fl->mutex);
 239
 240         return -ENOENT;
 241 }
 242
 243 static void fastrpc_buf_free(struct fastrpc_buf *buf)
 244 {
 245         dma_free_coherent(buf->dev, buf->size, buf->virt,
 246                           FASTRPC_PHYS(buf->phys));
 247         kfree(buf);
 248 }
 249
 250 static int fastrpc_buf_alloc(struct fastrpc_user *fl, struct device *dev,
 251                              u64 size, struct fastrpc_buf **obuf)
 252 {
 253         struct fastrpc_buf *buf;
 254
 255         buf = kzalloc(sizeof(*buf), GFP_KERNEL);
 256         if (!buf)
 257                 return -ENOMEM;
 258
 259         INIT_LIST_HEAD(&buf->attachments);
 260         mutex_init(&buf->lock);
 261
 262         buf->fl = fl;
 263         buf->virt = NULL;
 264         buf->phys = 0;
 265         buf->size = size;
 266         buf->dev = dev;
 267
 268         buf->virt = dma_alloc_coherent(dev, buf->size, (dma_addr_t *)&buf->phys,
 269                                        GFP_KERNEL);
 270         if (!buf->virt)
 271                 return -ENOMEM;
 272
 273         if (fl->sctx && fl->sctx->sid)
 274                 buf->phys += ((u64)fl->sctx->sid << 32);
 275
 276         *obuf = buf;
 277
 278         return 0;
 279 }
 280
 281 static void fastrpc_context_free(struct kref *ref)
 282 {
 283         struct fastrpc_invoke_ctx *ctx;
 284         struct fastrpc_channel_ctx *cctx;
 285         int i;
 286
 287         ctx = container_of(ref, struct fastrpc_invoke_ctx, refcount);
 288         cctx = ctx->cctx;
 289
 290         for (i = 0; i < ctx->nscalars; i++)
 291                 fastrpc_map_put(ctx->maps[i]);
 292
 293         if (ctx->buf)
 294                 fastrpc_buf_free(ctx->buf);
 295
 296         spin_lock(&cctx->lock);
 297         idr_remove(&cctx->ctx_idr, ctx->ctxid >> 4);
 298         spin_unlock(&cctx->lock);
 299
 300         kfree(ctx->maps);
 301         kfree(ctx);
 302 }
 303
 304 static void fastrpc_context_get(struct fastrpc_invoke_ctx *ctx)
 305 {
 306         kref_get(&ctx->refcount);
 307 }
 308
 309 static void fastrpc_context_put(struct fastrpc_invoke_ctx *ctx)
 310 {
 311         kref_put(&ctx->refcount, fastrpc_context_free);
 312 }
 313
 314 static struct fastrpc_invoke_ctx *fastrpc_context_alloc(
 315                         struct fastrpc_user *user, u32 kernel, u32 sc,
 316                         struct fastrpc_invoke_args *args)
 317 {
 318         struct fastrpc_channel_ctx *cctx = user->cctx;
 319         struct fastrpc_invoke_ctx *ctx = NULL;
 320         int ret;
 321
 322         ctx = kzalloc(sizeof(*ctx), GFP_KERNEL);
 323         if (!ctx)
 324                 return ERR_PTR(-ENOMEM);
 325
 326         INIT_LIST_HEAD(&ctx->node);
 327         ctx->fl = user;
 328         ctx->nscalars = REMOTE_SCALARS_LENGTH(sc);
 329         ctx->nbufs = REMOTE_SCALARS_INBUFS(sc) +
 330                      REMOTE_SCALARS_OUTBUFS(sc);
 331
 332         if (ctx->nscalars) {
 333                 ctx->maps = kcalloc(ctx->nscalars,
 334                                     sizeof(*ctx->maps), GFP_KERNEL);
 335                 if (!ctx->maps) {
 336                         kfree(ctx);
 337                         return ERR_PTR(-ENOMEM);
 338                 }
 339                 ctx->args = args;
 340         }
 341
 342         ctx->sc = sc;
 343         ctx->retval = -1;
 344         ctx->pid = current->pid;
 345         ctx->tgid = user->tgid;
 346         ctx->cctx = cctx;
 347         init_completion(&ctx->work);
 348
 349         spin_lock(&user->lock);
 350         list_add_tail(&ctx->node, &user->pending);
 351         spin_unlock(&user->lock);
 352
 353         spin_lock(&cctx->lock);
 354         ret = idr_alloc_cyclic(&cctx->ctx_idr, ctx, 1,
 355                                FASTRPC_CTX_MAX, GFP_ATOMIC);
 356         if (ret < 0) {
 357                 spin_unlock(&cctx->lock);
 358                 goto err_idr;
 359         }
 360         ctx->ctxid = ret << 4;
 361         spin_unlock(&cctx->lock);
 362
 363         kref_init(&ctx->refcount);
 364
 365         return ctx;
 366 err_idr:
 367         spin_lock(&user->lock);
 368         list_del(&ctx->node);
 369         spin_unlock(&user->lock);
 370         kfree(ctx->maps);
 371         kfree(ctx);
 372
 373         return ERR_PTR(ret);
 374 }
 375
 376 static struct sg_table *
 377 fastrpc_map_dma_buf(struct dma_buf_attachment *attachment,
 378                     enum dma_data_direction dir)
 379 {
 380         struct fastrpc_dma_buf_attachment *a = attachment->priv;
 381         struct sg_table *table;
 382
 383         table = &a->sgt;
 384
 385         if (!dma_map_sg(attachment->dev, table->sgl, table->nents, dir))
 386                 return ERR_PTR(-ENOMEM);
 387
 388         return table;
 389 }
 390
 391 static void fastrpc_unmap_dma_buf(struct dma_buf_attachment *attach,
 392                                   struct sg_table *table,
 393                                   enum dma_data_direction dir)
 394 {
 395         dma_unmap_sg(attach->dev, table->sgl, table->nents, dir);
 396 }
 397
 398 static void fastrpc_release(struct dma_buf *dmabuf)
 399 {
 400         struct fastrpc_buf *buffer = dmabuf->priv;
 401
 402         fastrpc_buf_free(buffer);
 403 }
 404
 405 static int fastrpc_dma_buf_attach(struct dma_buf *dmabuf,
 406                                   struct dma_buf_attachment *attachment)
 407 {
 408         struct fastrpc_dma_buf_attachment *a;
 409         struct fastrpc_buf *buffer = dmabuf->priv;
 410         int ret;
 411
 412         a = kzalloc(sizeof(*a), GFP_KERNEL);
 413         if (!a)
 414                 return -ENOMEM;
 415
 416         ret = dma_get_sgtable(buffer->dev, &a->sgt, buffer->virt,
 417                               FASTRPC_PHYS(buffer->phys), buffer->size);
 418         if (ret < 0) {
 419                 dev_err(buffer->dev, "failed to get scatterlist from DMA API\n");
 420                 return -EINVAL;
 421         }
 422
 423         a->dev = attachment->dev;
 424         INIT_LIST_HEAD(&a->node);
 425         attachment->priv = a;
 426
 427         mutex_lock(&buffer->lock);
 428         list_add(&a->node, &buffer->attachments);
 429         mutex_unlock(&buffer->lock);
 430
 431         return 0;
 432 }
 433
 434 static void fastrpc_dma_buf_detatch(struct dma_buf *dmabuf,
 435                                     struct dma_buf_attachment *attachment)
 436 {
 437         struct fastrpc_dma_buf_attachment *a = attachment->priv;
 438         struct fastrpc_buf *buffer = dmabuf->priv;
 439
 440         mutex_lock(&buffer->lock);
 441         list_del(&a->node);
 442         mutex_unlock(&buffer->lock);
 443         kfree(a);
 444 }
 445
 446 static void *fastrpc_kmap(struct dma_buf *dmabuf, unsigned long pgnum)
 447 {
 448         struct fastrpc_buf *buf = dmabuf->priv;
 449
 450         return buf->virt ? buf->virt + pgnum * PAGE_SIZE : NULL;
 451 }
 452
 453 static void *fastrpc_vmap(struct dma_buf *dmabuf)
 454 {
 455         struct fastrpc_buf *buf = dmabuf->priv;
 456
 457         return buf->virt;
 458 }
 459
 460 static int fastrpc_mmap(struct dma_buf *dmabuf,
 461                         struct vm_area_struct *vma)
 462 {
 463         struct fastrpc_buf *buf = dmabuf->priv;
 464         size_t size = vma->vm_end - vma->vm_start;
 465
 466         return dma_mmap_coherent(buf->dev, vma, buf->virt,
 467                                  FASTRPC_PHYS(buf->phys), size);
 468 }
 469
 470 static const struct dma_buf_ops fastrpc_dma_buf_ops = {
 471         .attach = fastrpc_dma_buf_attach,
 472         .detach = fastrpc_dma_buf_detatch,
 473         .map_dma_buf = fastrpc_map_dma_buf,
 474         .unmap_dma_buf = fastrpc_unmap_dma_buf,
 475         .mmap = fastrpc_mmap,
 476         .map = fastrpc_kmap,
 477         .vmap = fastrpc_vmap,
 478         .release = fastrpc_release,
 479 };
 480
 481 static int fastrpc_map_create(struct fastrpc_user *fl, int fd,
 482                               u64 len, struct fastrpc_map **ppmap)
 483 {
 484         struct fastrpc_session_ctx *sess = fl->sctx;
 485         struct fastrpc_map *map = NULL;
 486         int err = 0;
 487
 488         if (!fastrpc_map_find(fl, fd, ppmap))
 489                 return 0;
 490
 491         map = kzalloc(sizeof(*map), GFP_KERNEL);
 492         if (!map)
 493                 return -ENOMEM;
 494
 495         INIT_LIST_HEAD(&map->node);
 496         map->fl = fl;
 497         map->fd = fd;
 498         map->buf = dma_buf_get(fd);
 499         if (IS_ERR(map->buf)) {
 500                 err = PTR_ERR(map->buf);
 501                 goto get_err;
 502         }
 503
 504         map->attach = dma_buf_attach(map->buf, sess->dev);
 505         if (IS_ERR(map->attach)) {
 506                 dev_err(sess->dev, "Failed to attach dmabuf\n");
 507                 err = PTR_ERR(map->attach);
 508                 goto attach_err;
 509         }
 510
 511         map->table = dma_buf_map_attachment(map->attach, DMA_BIDIRECTIONAL);
 512         if (IS_ERR(map->table)) {
 513                 err = PTR_ERR(map->table);
 514                 goto map_err;
 515         }
 516
 517         map->phys = sg_dma_address(map->table->sgl);
 518         map->phys += ((u64)fl->sctx->sid << 32);
 519         map->size = len;
 520         map->va = sg_virt(map->table->sgl);
 521         map->len = len;
 522         kref_init(&map->refcount);
 523
 524         spin_lock(&fl->lock);
 525         list_add_tail(&map->node, &fl->maps);
 526         spin_unlock(&fl->lock);
 527         *ppmap = map;
 528
 529         return 0;
 530
 531 map_err:
 532         dma_buf_detach(map->buf, map->attach);
 533 attach_err:
 534         dma_buf_put(map->buf);
 535 get_err:
 536         kfree(map);
 537
 538         return err;
 539 }
 540
 541 /*
 542  * Fastrpc payload buffer with metadata looks like:
 543  *
 544  * >>>>>>  START of METADATA <<<<<<<<<
 545  * +---------------------------------+
 546  * |           Arguments             |
 547  * | type:(struct fastrpc_remote_arg)|
 548  * |             (0 - N)             |
 549  * +---------------------------------+
 550  * |         Invoke Buffer list      |
 551  * | type:(struct fastrpc_invoke_buf)|
 552  * |           (0 - N)               |
 553  * +---------------------------------+
 554  * |         Page info list          |
 555  * | type:(struct fastrpc_phy_page)  |
 556  * |             (0 - N)             |
 557  * +---------------------------------+
 558  * |         Optional info           |
 559  * |(can be specific to SoC/Firmware)|
 560  * +---------------------------------+
 561  * >>>>>>>>  END of METADATA <<<<<<<<<
 562  * +---------------------------------+
 563  * |         Inline ARGS             |
 564  * |            (0-N)                |
 565  * +---------------------------------+
 566  */
 567
 568 static int fastrpc_get_meta_size(struct fastrpc_invoke_ctx *ctx)
 569 {
 570         int size = 0;
 571
 572         size = (sizeof(struct fastrpc_remote_arg) +
 573                 sizeof(struct fastrpc_invoke_buf) +
 574                 sizeof(struct fastrpc_phy_page)) * ctx->nscalars +
 575                 sizeof(u64) * FASTRPC_MAX_FDLIST +
 576                 sizeof(u32) * FASTRPC_MAX_CRCLIST;
 577
 578         return size;
 579 }
 580
 581 static u64 fastrpc_get_payload_size(struct fastrpc_invoke_ctx *ctx, int metalen)
 582 {
 583         u64 size = 0;
 584         int i;
 585
 586         size = ALIGN(metalen, FASTRPC_ALIGN);
 587         for (i = 0; i < ctx->nscalars; i++) {
 588                 if (ctx->args[i].fd == 0 || ctx->args[i].fd == -1) {
 589                         size = ALIGN(size, FASTRPC_ALIGN);
 590                         size += ctx->args[i].length;
 591                 }
 592         }
 593
 594         return size;
 595 }
 596
 597 static int fastrpc_create_maps(struct fastrpc_invoke_ctx *ctx)
 598 {
 599         struct device *dev = ctx->fl->sctx->dev;
 600         int i, err;
 601
 602         for (i = 0; i < ctx->nscalars; ++i) {
 603                 /* Make sure reserved field is set to 0 */
 604                 if (ctx->args[i].reserved)
 605                         return -EINVAL;
 606
 607                 if (ctx->args[i].fd == 0 || ctx->args[i].fd == -1 ||
 608                     ctx->args[i].length == 0)
 609                         continue;
 610
 611                 err = fastrpc_map_create(ctx->fl, ctx->args[i].fd,
 612                                          ctx->args[i].length, &ctx->maps[i]);
 613                 if (err) {
 614                         dev_err(dev, "Error Creating map %d\n", err);
 615                         return -EINVAL;
 616                 }
 617
 618         }
 619         return 0;
 620 }
 621
 622 static int fastrpc_get_args(u32 kernel, struct fastrpc_invoke_ctx *ctx)
 623 {
 624         struct device *dev = ctx->fl->sctx->dev;
 625         struct fastrpc_remote_arg *rpra;
 626         struct fastrpc_invoke_buf *list;
 627         struct fastrpc_phy_page *pages;
 628         int inbufs, i, err = 0;
 629         u64 rlen, pkt_size;
 630         uintptr_t args;
 631         int metalen;
 632
 633
 634         inbufs = REMOTE_SCALARS_INBUFS(ctx->sc);
 635         metalen = fastrpc_get_meta_size(ctx);
 636         pkt_size = fastrpc_get_payload_size(ctx, metalen);
 637
 638         err = fastrpc_create_maps(ctx);
 639         if (err)
 640                 return err;
 641
 642         ctx->msg_sz = pkt_size;
 643
 644         err = fastrpc_buf_alloc(ctx->fl, dev, pkt_size, &ctx->buf);
 645         if (err)
 646                 return err;
 647
 648         rpra = ctx->buf->virt;
 649         list = ctx->buf->virt + ctx->nscalars * sizeof(*rpra);
 650         pages = ctx->buf->virt + ctx->nscalars * (sizeof(*list) +
 651                 sizeof(*rpra));
 652         args = (uintptr_t)ctx->buf->virt + metalen;
 653         rlen = pkt_size - metalen;
 654         ctx->rpra = rpra;
 655
 656         for (i = 0; i < ctx->nbufs; ++i) {
 657                 u64 len = ctx->args[i].length;
 658
 659                 rpra[i].pv = 0;
 660                 rpra[i].len = len;
 661                 list[i].num = len ? 1 : 0;
 662                 list[i].pgidx = i;
 663
 664                 if (!len)
 665                         continue;
 666
 667                 pages[i].size = roundup(len, PAGE_SIZE);
 668
 669                 if (ctx->maps[i]) {
 670                         rpra[i].pv = (u64) ctx->args[i].ptr;
 671                         pages[i].addr = ctx->maps[i]->phys;
 672                 } else {
 673                         rlen -= ALIGN(args, FASTRPC_ALIGN) - args;
 674                         args = ALIGN(args, FASTRPC_ALIGN);
 675                         if (rlen < len)
 676                                 goto bail;
 677
 678                         rpra[i].pv = args;
 679                         pages[i].addr = ctx->buf->phys + (pkt_size - rlen);
 680                         pages[i].addr = pages[i].addr & PAGE_MASK;
 681                         args = args + len;
 682                         rlen -= len;
 683                 }
 684
 685                 if (i < inbufs && !ctx->maps[i]) {
 686                         void *dst = (void *)(uintptr_t)rpra[i].pv;
 687                         void *src = (void *)(uintptr_t)ctx->args[i].ptr;
 688
 689                         if (!kernel) {
 690                                 if (copy_from_user(dst, (void __user *)src,
 691                                                    len)) {
 692                                         err = -EFAULT;
 693                                         goto bail;
 694                                 }
 695                         } else {
 696                                 memcpy(dst, src, len);
 697                         }
 698                 }
 699         }
 700
 701         for (i = ctx->nbufs; i < ctx->nscalars; ++i) {
 702                 rpra[i].pv = (u64) ctx->args[i].ptr;
 703                 rpra[i].len = ctx->args[i].length;
 704                 list[i].num = ctx->args[i].length ? 1 : 0;
 705                 list[i].pgidx = i;
 706                 pages[i].addr = ctx->maps[i]->phys;
 707                 pages[i].size = ctx->maps[i]->size;
 708         }
 709
 710 bail:
 711         if (err)
 712                 dev_err(dev, "Error: get invoke args failed:%d\n", err);
 713
 714         return err;
 715 }
 716
 717 static int fastrpc_put_args(struct fastrpc_invoke_ctx *ctx,
 718                             u32 kernel)
 719 {
 720         struct fastrpc_remote_arg *rpra = ctx->rpra;
 721         int i, inbufs;
 722
 723         inbufs = REMOTE_SCALARS_INBUFS(ctx->sc);
 724
 725         for (i = inbufs; i < ctx->nbufs; ++i) {
 726                 void *src = (void *)(uintptr_t)rpra[i].pv;
 727                 void *dst = (void *)(uintptr_t)ctx->args[i].ptr;
 728                 u64 len = rpra[i].len;
 729
 730                 if (!kernel) {
 731                         if (copy_to_user((void __user *)dst, src, len))
 732                                 return -EFAULT;
 733                 } else {
 734                         memcpy(dst, src, len);
 735                 }
 736         }
 737
 738         return 0;
 739 }
 740
 741 static int fastrpc_invoke_send(struct fastrpc_session_ctx *sctx,
 742                                struct fastrpc_invoke_ctx *ctx,
 743                                u32 kernel, uint32_t handle)
 744 {
 745         struct fastrpc_channel_ctx *cctx;
 746         struct fastrpc_user *fl = ctx->fl;
 747         struct fastrpc_msg *msg = &ctx->msg;
 748
 749         cctx = fl->cctx;
 750         msg->pid = fl->tgid;
 751         msg->tid = current->pid;
 752
 753         if (kernel)
 754                 msg->pid = 0;
 755
 756         msg->ctx = ctx->ctxid | fl->pd;
 757         msg->handle = handle;
 758         msg->sc = ctx->sc;
 759         msg->addr = ctx->buf ? ctx->buf->phys : 0;
 760         msg->size = roundup(ctx->msg_sz, PAGE_SIZE);
 761         fastrpc_context_get(ctx);
 762
 763         return rpmsg_send(cctx->rpdev->ept, (void *)msg, sizeof(*msg));
 764 }
 765
 766 static int fastrpc_internal_invoke(struct fastrpc_user *fl,  u32 kernel,
 767                                    u32 handle, u32 sc,
 768                                    struct fastrpc_invoke_args *args)
 769 {
 770         struct fastrpc_invoke_ctx *ctx = NULL;
 771         int err = 0;
 772
 773         if (!fl->sctx)
 774                 return -EINVAL;
 775
 776         ctx = fastrpc_context_alloc(fl, kernel, sc, args);
 777         if (IS_ERR(ctx))
 778                 return PTR_ERR(ctx);
 779
 780         if (ctx->nscalars) {
 781                 err = fastrpc_get_args(kernel, ctx);
 782                 if (err)
 783                         goto bail;
 784         }
 785         /* Send invoke buffer to remote dsp */
 786         err = fastrpc_invoke_send(fl->sctx, ctx, kernel, handle);
 787         if (err)
 788                 goto bail;
 789
 790         /* Wait for remote dsp to respond or time out */
 791         err = wait_for_completion_interruptible(&ctx->work);
 792         if (err)
 793                 goto bail;
 794
 795         /* Check the response from remote dsp */
 796         err = ctx->retval;
 797         if (err)
 798                 goto bail;
 799
 800         if (ctx->nscalars) {
 801                 /* populate all the output buffers with results */
 802                 err = fastrpc_put_args(ctx, kernel);
 803                 if (err)
 804                         goto bail;
 805         }
 806
 807 bail:
 808         /* We are done with this compute context, remove it from pending list */
 809         spin_lock(&fl->lock);
 810         list_del(&ctx->node);
 811         spin_unlock(&fl->lock);
 812         fastrpc_context_put(ctx);
 813
 814         if (err)
 815                 dev_dbg(fl->sctx->dev, "Error: Invoke Failed %d\n", err);
 816
 817         return err;
 818 }
 819
 820 static int fastrpc_init_create_process(struct fastrpc_user *fl,
 821                                         char __user *argp)
 822 {
 823         struct fastrpc_init_create init;
 824         struct fastrpc_invoke_args *args;
 825         struct fastrpc_phy_page pages[1];
 826         struct fastrpc_map *map = NULL;
 827         struct fastrpc_buf *imem = NULL;
 828         int memlen;
 829         int err;
 830         struct {
 831                 int pgid;
 832                 u32 namelen;
 833                 u32 filelen;
 834                 u32 pageslen;
 835                 u32 attrs;
 836                 u32 siglen;
 837         } inbuf;
 838         u32 sc;
 839
 840         args = kcalloc(FASTRPC_CREATE_PROCESS_NARGS, sizeof(*args), GFP_KERNEL);
 841         if (!args)
 842                 return -ENOMEM;
 843
 844         if (copy_from_user(&init, argp, sizeof(init))) {
 845                 err = -EFAULT;
 846                 goto bail;
 847         }
 848
 849         if (init.filelen > INIT_FILELEN_MAX) {
 850                 err = -EINVAL;
 851                 goto bail;
 852         }
 853
 854         inbuf.pgid = fl->tgid;
 855         inbuf.namelen = strlen(current->comm) + 1;
 856         inbuf.filelen = init.filelen;
 857         inbuf.pageslen = 1;
 858         inbuf.attrs = init.attrs;
 859         inbuf.siglen = init.siglen;
 860         fl->pd = 1;
 861
 862         if (init.filelen && init.filefd) {
 863                 err = fastrpc_map_create(fl, init.filefd, init.filelen, &map);
 864                 if (err)
 865                         goto bail;
 866         }
 867
 868         memlen = ALIGN(max(INIT_FILELEN_MAX, (int)init.filelen * 4),
 869                        1024 * 1024);
 870         err = fastrpc_buf_alloc(fl, fl->sctx->dev, memlen,
 871                                 &imem);
 872         if (err) {
 873                 fastrpc_map_put(map);
 874                 goto bail;
 875         }
 876
 877         fl->init_mem = imem;
 878         args[0].ptr = (u64)(uintptr_t)&inbuf;
 879         args[0].length = sizeof(inbuf);
 880         args[0].fd = -1;
 881
 882         args[1].ptr = (u64)(uintptr_t)current->comm;
 883         args[1].length = inbuf.namelen;
 884         args[1].fd = -1;
 885
 886         args[2].ptr = (u64) init.file;
 887         args[2].length = inbuf.filelen;
 888         args[2].fd = init.filefd;
 889
 890         pages[0].addr = imem->phys;
 891         pages[0].size = imem->size;
 892
 893         args[3].ptr = (u64)(uintptr_t) pages;
 894         args[3].length = 1 * sizeof(*pages);
 895         args[3].fd = -1;
 896
 897         args[4].ptr = (u64)(uintptr_t)&inbuf.attrs;
 898         args[4].length = sizeof(inbuf.attrs);
 899         args[4].fd = -1;
 900
 901         args[5].ptr = (u64)(uintptr_t) &inbuf.siglen;
 902         args[5].length = sizeof(inbuf.siglen);
 903         args[5].fd = -1;
 904
 905         sc = FASTRPC_SCALARS(FASTRPC_RMID_INIT_CREATE, 4, 0);
 906         if (init.attrs)
 907                 sc = FASTRPC_SCALARS(FASTRPC_RMID_INIT_CREATE_ATTR, 6, 0);
 908
 909         err = fastrpc_internal_invoke(fl, true, FASTRPC_INIT_HANDLE,
 910                                       sc, args);
 911
 912         if (err) {
 913                 fastrpc_map_put(map);
 914                 fastrpc_buf_free(imem);
 915         }
 916
 917 bail:
 918         kfree(args);
 919
 920         return err;
 921 }
 922
 923 static struct fastrpc_session_ctx *fastrpc_session_alloc(
 924                                         struct fastrpc_channel_ctx *cctx)
 925 {
 926         struct fastrpc_session_ctx *session = NULL;
 927         int i;
 928
 929         spin_lock(&cctx->lock);
 930         for (i = 0; i < cctx->sesscount; i++) {
 931                 if (!cctx->session[i].used && cctx->session[i].valid) {
 932                         cctx->session[i].used = true;
 933                         session = &cctx->session[i];
 934                         break;
 935                 }
 936         }
 937         spin_unlock(&cctx->lock);
 938
 939         return session;
 940 }
 941
 942 static void fastrpc_session_free(struct fastrpc_channel_ctx *cctx,
 943                                  struct fastrpc_session_ctx *session)
 944 {
 945         spin_lock(&cctx->lock);
 946         session->used = false;
 947         spin_unlock(&cctx->lock);
 948 }
 949
 950 static int fastrpc_release_current_dsp_process(struct fastrpc_user *fl)
 951 {
 952         struct fastrpc_invoke_args args[1];
 953         int tgid = 0;
 954         u32 sc;
 955
 956         tgid = fl->tgid;
 957         args[0].ptr = (u64)(uintptr_t) &tgid;
 958         args[0].length = sizeof(tgid);
 959         args[0].fd = -1;
 960         args[0].reserved = 0;
 961         sc = FASTRPC_SCALARS(FASTRPC_RMID_INIT_RELEASE, 1, 0);
 962
 963         return fastrpc_internal_invoke(fl, true, FASTRPC_INIT_HANDLE,
 964                                        sc, &args[0]);
 965 }
 966
 967 static int fastrpc_device_release(struct inode *inode, struct file *file)
 968 {
 969         struct fastrpc_user *fl = (struct fastrpc_user *)file->private_data;
 970         struct fastrpc_channel_ctx *cctx = fl->cctx;
 971         struct fastrpc_invoke_ctx *ctx, *n;
 972         struct fastrpc_map *map, *m;
 973
 974         fastrpc_release_current_dsp_process(fl);
 975
 976         spin_lock(&cctx->lock);
 977         list_del(&fl->user);
 978         spin_unlock(&cctx->lock);
 979
 980         if (fl->init_mem)
 981                 fastrpc_buf_free(fl->init_mem);
 982
 983         list_for_each_entry_safe(ctx, n, &fl->pending, node) {
 984                 list_del(&ctx->node);
 985                 fastrpc_context_put(ctx);
 986         }
 987
 988         list_for_each_entry_safe(map, m, &fl->maps, node) {
 989                 list_del(&map->node);
 990                 fastrpc_map_put(map);
 991         }
 992
 993         fastrpc_session_free(cctx, fl->sctx);
 994
 995         mutex_destroy(&fl->mutex);
 996         kfree(fl);
 997         file->private_data = NULL;
 998
 999         return 0;
1000 }
1001
1002 static int fastrpc_device_open(struct inode *inode, struct file *filp)
1003 {
1004         struct fastrpc_channel_ctx *cctx = miscdev_to_cctx(filp->private_data);
1005         struct fastrpc_user *fl = NULL;
1006
1007         fl = kzalloc(sizeof(*fl), GFP_KERNEL);
1008         if (!fl)
1009                 return -ENOMEM;
1010
1011         filp->private_data = fl;
1012         spin_lock_init(&fl->lock);
1013         mutex_init(&fl->mutex);
1014         INIT_LIST_HEAD(&fl->pending);
1015         INIT_LIST_HEAD(&fl->maps);
1016         INIT_LIST_HEAD(&fl->user);
1017         fl->tgid = current->tgid;
1018         fl->cctx = cctx;
1019
1020         fl->sctx = fastrpc_session_alloc(cctx);
1021         if (!fl->sctx) {
1022                 dev_err(&cctx->rpdev->dev, "No session available\n");
1023                 mutex_destroy(&fl->mutex);
1024                 kfree(fl);
1025
1026                 return -EBUSY;
1027         }
1028
1029         spin_lock(&cctx->lock);
1030         list_add_tail(&fl->user, &cctx->users);
1031         spin_unlock(&cctx->lock);
1032
1033         return 0;
1034 }
1035
1036 static int fastrpc_dmabuf_free(struct fastrpc_user *fl, char __user *argp)
1037 {
1038         struct dma_buf *buf;
1039         int info;
1040
1041         if (copy_from_user(&info, argp, sizeof(info)))
1042                 return -EFAULT;
1043
1044         buf = dma_buf_get(info);
1045         if (IS_ERR_OR_NULL(buf))
1046                 return -EINVAL;
1047         /*
1048          * one for the last get and other for the ALLOC_DMA_BUFF ioctl
1049          */
1050         dma_buf_put(buf);
1051         dma_buf_put(buf);
1052
1053         return 0;
1054 }
1055
1056 static int fastrpc_dmabuf_alloc(struct fastrpc_user *fl, char __user *argp)
1057 {
1058         struct fastrpc_alloc_dma_buf bp;
1059         DEFINE_DMA_BUF_EXPORT_INFO(exp_info);
1060         struct fastrpc_buf *buf = NULL;
1061         int err;
1062
1063         if (copy_from_user(&bp, argp, sizeof(bp)))
1064                 return -EFAULT;
1065
1066         err = fastrpc_buf_alloc(fl, fl->sctx->dev, bp.size, &buf);
1067         if (err)
1068                 return err;
1069         exp_info.ops = &fastrpc_dma_buf_ops;
1070         exp_info.size = bp.size;
1071         exp_info.flags = O_RDWR;
1072         exp_info.priv = buf;
1073         buf->dmabuf = dma_buf_export(&exp_info);
1074         if (IS_ERR(buf->dmabuf)) {
1075                 err = PTR_ERR(buf->dmabuf);
1076                 fastrpc_buf_free(buf);
1077                 return err;
1078         }
1079
1080         bp.fd = dma_buf_fd(buf->dmabuf, O_ACCMODE);
1081         if (bp.fd < 0) {
1082                 dma_buf_put(buf->dmabuf);
1083                 return -EINVAL;
1084         }
1085
1086         if (copy_to_user(argp, &bp, sizeof(bp))) {
1087                 dma_buf_put(buf->dmabuf);
1088                 return -EFAULT;
1089         }
1090
1091         get_dma_buf(buf->dmabuf);
1092
1093         return 0;
1094 }
1095
1096 static int fastrpc_init_attach(struct fastrpc_user *fl)
1097 {
1098         struct fastrpc_invoke_args args[1];
1099         int tgid = fl->tgid;
1100         u32 sc;
1101
1102         args[0].ptr = (u64)(uintptr_t) &tgid;
1103         args[0].length = sizeof(tgid);
1104         args[0].fd = -1;
1105         args[0].reserved = 0;
1106         sc = FASTRPC_SCALARS(FASTRPC_RMID_INIT_ATTACH, 1, 0);
1107         fl->pd = 0;
1108
1109         return fastrpc_internal_invoke(fl, true, FASTRPC_INIT_HANDLE,
1110                                        sc, &args[0]);
1111 }
1112
1113 static int fastrpc_invoke(struct fastrpc_user *fl, char __user *argp)
1114 {
1115         struct fastrpc_invoke_args *args = NULL;
1116         struct fastrpc_invoke inv;
1117         u32 nscalars;
1118         int err;
1119
1120         if (copy_from_user(&inv, argp, sizeof(inv)))
1121                 return -EFAULT;
1122
1123         /* nscalars is truncated here to max supported value */
1124         nscalars = REMOTE_SCALARS_LENGTH(inv.sc);
1125         if (nscalars) {
1126                 args = kcalloc(nscalars, sizeof(*args), GFP_KERNEL);
1127                 if (!args)
1128                         return -ENOMEM;
1129
1130                 if (copy_from_user(args, (void __user *)(uintptr_t)inv.args,
1131                                    nscalars * sizeof(*args))) {
1132                         kfree(args);
1133                         return -EFAULT;
1134                 }
1135         }
1136
1137         err = fastrpc_internal_invoke(fl, false, inv.handle, inv.sc, args);
1138         kfree(args);
1139
1140         return err;
1141 }
1142
1143 static long fastrpc_device_ioctl(struct file *file, unsigned int cmd,
1144                                  unsigned long arg)
1145 {
1146         struct fastrpc_user *fl = (struct fastrpc_user *)file->private_data;
1147         char __user *argp = (char __user *)arg;
1148         int err;
1149
1150         switch (cmd) {
1151         case FASTRPC_IOCTL_INVOKE:
1152                 err = fastrpc_invoke(fl, argp);
1153                 break;
1154         case FASTRPC_IOCTL_INIT_ATTACH:
1155                 err = fastrpc_init_attach(fl);
1156                 break;
1157         case FASTRPC_IOCTL_INIT_CREATE:
1158                 err = fastrpc_init_create_process(fl, argp);
1159                 break;
1160         case FASTRPC_IOCTL_FREE_DMA_BUFF:
1161                 err = fastrpc_dmabuf_free(fl, argp);
1162                 break;
1163         case FASTRPC_IOCTL_ALLOC_DMA_BUFF:
1164                 err = fastrpc_dmabuf_alloc(fl, argp);
1165                 break;
1166         default:
1167                 err = -ENOTTY;
1168                 break;
1169         }
1170
1171         return err;
1172 }
1173
1174 static const struct file_operations fastrpc_fops = {
1175         .open = fastrpc_device_open,
1176         .release = fastrpc_device_release,
1177         .unlocked_ioctl = fastrpc_device_ioctl,
1178         .compat_ioctl = fastrpc_device_ioctl,
1179 };
1180
1181 static int fastrpc_cb_probe(struct platform_device *pdev)
1182 {
1183         struct fastrpc_channel_ctx *cctx;
1184         struct fastrpc_session_ctx *sess;
1185         struct device *dev = &pdev->dev;
1186         int i, sessions = 0;
1187
1188         cctx = dev_get_drvdata(dev->parent);
1189         if (!cctx)
1190                 return -EINVAL;
1191
1192         of_property_read_u32(dev->of_node, "qcom,nsessions", &sessions);
1193
1194         spin_lock(&cctx->lock);
1195         sess = &cctx->session[cctx->sesscount];
1196         sess->used = false;
1197         sess->valid = true;
1198         sess->dev = dev;
1199         dev_set_drvdata(dev, sess);
1200
1201         if (of_property_read_u32(dev->of_node, "reg", &sess->sid))
1202                 dev_info(dev, "FastRPC Session ID not specified in DT\n");
1203
1204         if (sessions > 0) {
1205                 struct fastrpc_session_ctx *dup_sess;
1206
1207                 for (i = 1; i < sessions; i++) {
1208                         if (cctx->sesscount++ >= FASTRPC_MAX_SESSIONS)
1209                                 break;
1210                         dup_sess = &cctx->session[cctx->sesscount];
1211                         memcpy(dup_sess, sess, sizeof(*dup_sess));
1212                 }
1213         }
1214         cctx->sesscount++;
1215         spin_unlock(&cctx->lock);
1216         dma_set_mask(dev, DMA_BIT_MASK(32));
1217
1218         return 0;
1219 }
1220
1221 static int fastrpc_cb_remove(struct platform_device *pdev)
1222 {
1223         struct fastrpc_channel_ctx *cctx = dev_get_drvdata(pdev->dev.parent);
1224         struct fastrpc_session_ctx *sess = dev_get_drvdata(&pdev->dev);
1225         int i;
1226
1227         spin_lock(&cctx->lock);
1228         for (i = 1; i < FASTRPC_MAX_SESSIONS; i++) {
1229                 if (cctx->session[i].sid == sess->sid) {
1230                         cctx->session[i].valid = false;
1231                         cctx->sesscount--;
1232                 }
1233         }
1234         spin_unlock(&cctx->lock);
1235
1236         return 0;
1237 }
1238
1239 static const struct of_device_id fastrpc_match_table[] = {
1240         { .compatible = "qcom,fastrpc-compute-cb", },
1241         {}
1242 };
1243
1244 static struct platform_driver fastrpc_cb_driver = {
1245         .probe = fastrpc_cb_probe,
1246         .remove = fastrpc_cb_remove,
1247         .driver = {
1248                 .name = "qcom,fastrpc-cb",
1249                 .of_match_table = fastrpc_match_table,
1250                 .suppress_bind_attrs = true,
1251         },
1252 };
1253
1254 static int fastrpc_rpmsg_probe(struct rpmsg_device *rpdev)
1255 {
1256         struct device *rdev = &rpdev->dev;
1257         struct fastrpc_channel_ctx *data;
1258         int i, err, domain_id = -1;
1259         const char *domain;
1260
1261         data = devm_kzalloc(rdev, sizeof(*data), GFP_KERNEL);
1262         if (!data)
1263                 return -ENOMEM;
1264
1265         err = of_property_read_string(rdev->of_node, "label", &domain);
1266         if (err) {
1267                 dev_info(rdev, "FastRPC Domain not specified in DT\n");
1268                 return err;
1269         }
1270
1271         for (i = 0; i <= CDSP_DOMAIN_ID; i++) {
1272                 if (!strcmp(domains[i], domain)) {
1273                         domain_id = i;
1274                         break;
1275                 }
1276         }
1277
1278         if (domain_id < 0) {
1279                 dev_info(rdev, "FastRPC Invalid Domain ID %d\n", domain_id);
1280                 return -EINVAL;
1281         }
1282
1283         data->miscdev.minor = MISC_DYNAMIC_MINOR;
1284         data->miscdev.name = kasprintf(GFP_KERNEL, "fastrpc-%s",
1285                                 domains[domain_id]);
1286         data->miscdev.fops = &fastrpc_fops;
1287         err = misc_register(&data->miscdev);
1288         if (err)
1289                 return err;
1290
1291         dev_set_drvdata(&rpdev->dev, data);
1292         dma_set_mask_and_coherent(rdev, DMA_BIT_MASK(32));
1293         INIT_LIST_HEAD(&data->users);
1294         spin_lock_init(&data->lock);
1295         idr_init(&data->ctx_idr);
1296         data->domain_id = domain_id;
1297         data->rpdev = rpdev;
1298
1299         return of_platform_populate(rdev->of_node, NULL, NULL, rdev);
1300 }
1301
1302 static void fastrpc_notify_users(struct fastrpc_user *user)
1303 {
1304         struct fastrpc_invoke_ctx *ctx;
1305
1306         spin_lock(&user->lock);
1307         list_for_each_entry(ctx, &user->pending, node)
1308                 complete(&ctx->work);
1309         spin_unlock(&user->lock);
1310 }
1311
1312 static void fastrpc_rpmsg_remove(struct rpmsg_device *rpdev)
1313 {
1314         struct fastrpc_channel_ctx *cctx = dev_get_drvdata(&rpdev->dev);
1315         struct fastrpc_user *user;
1316
1317         spin_lock(&cctx->lock);
1318         list_for_each_entry(user, &cctx->users, user)
1319                 fastrpc_notify_users(user);
1320         spin_unlock(&cctx->lock);
1321
1322         misc_deregister(&cctx->miscdev);
1323         of_platform_depopulate(&rpdev->dev);
1324         kfree(cctx);
1325 }
1326
1327 static int fastrpc_rpmsg_callback(struct rpmsg_device *rpdev, void *data,
1328                                   int len, void *priv, u32 addr)
1329 {
1330         struct fastrpc_channel_ctx *cctx = dev_get_drvdata(&rpdev->dev);
1331         struct fastrpc_invoke_rsp *rsp = data;
1332         struct fastrpc_invoke_ctx *ctx;
1333         unsigned long flags;
1334         unsigned long ctxid;
1335
1336         if (len < sizeof(*rsp))
1337                 return -EINVAL;
1338
1339         ctxid = ((rsp->ctx & FASTRPC_CTXID_MASK) >> 4);
1340
1341         spin_lock_irqsave(&cctx->lock, flags);
1342         ctx = idr_find(&cctx->ctx_idr, ctxid);
1343         spin_unlock_irqrestore(&cctx->lock, flags);
1344
1345         if (!ctx) {
1346                 dev_err(&rpdev->dev, "No context ID matches response\n");
1347                 return -ENOENT;
1348         }
1349
1350         ctx->retval = rsp->retval;
1351         complete(&ctx->work);
1352         fastrpc_context_put(ctx);
1353
1354         return 0;
1355 }
1356
1357 static const struct of_device_id fastrpc_rpmsg_of_match[] = {
1358         { .compatible = "qcom,fastrpc" },
1359         { },
1360 };
1361 MODULE_DEVICE_TABLE(of, fastrpc_rpmsg_of_match);
1362
1363 static struct rpmsg_driver fastrpc_driver = {
1364         .probe = fastrpc_rpmsg_probe,
1365         .remove = fastrpc_rpmsg_remove,
1366         .callback = fastrpc_rpmsg_callback,
1367         .drv = {
1368                 .name = "qcom,fastrpc",
1369                 .of_match_table = fastrpc_rpmsg_of_match,
1370         },
1371 };
1372
1373 static int fastrpc_init(void)
1374 {
1375         int ret;
1376
1377         ret = platform_driver_register(&fastrpc_cb_driver);
1378         if (ret < 0) {
1379                 pr_err("fastrpc: failed to register cb driver\n");
1380                 return ret;
1381         }
1382
1383         ret = register_rpmsg_driver(&fastrpc_driver);
1384         if (ret < 0) {
1385                 pr_err("fastrpc: failed to register rpmsg driver\n");
1386                 platform_driver_unregister(&fastrpc_cb_driver);
1387                 return ret;
1388         }
1389
1390         return 0;
1391 }
1392 module_init(fastrpc_init);
1393
1394 static void fastrpc_exit(void)
1395 {
1396         platform_driver_unregister(&fastrpc_cb_driver);
1397         unregister_rpmsg_driver(&fastrpc_driver);
1398 }
1399 module_exit(fastrpc_exit);
1400
1401 MODULE_LICENSE("GPL v2");