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/sort.h>
  16 #include <linux/of_platform.h>
  17 #include <linux/rpmsg.h>
  18 #include <linux/scatterlist.h>
  19 #include <linux/slab.h>
  20 #include <uapi/misc/fastrpc.h>
  21
  22 #define ADSP_DOMAIN_ID (0)
  23 #define MDSP_DOMAIN_ID (1)
  24 #define SDSP_DOMAIN_ID (2)
  25 #define CDSP_DOMAIN_ID (3)
  26 #define FASTRPC_DEV_MAX         4 /* adsp, mdsp, slpi, cdsp*/
  27 #define FASTRPC_MAX_SESSIONS    9 /*8 compute, 1 cpz*/
  28 #define FASTRPC_ALIGN           128
  29 #define FASTRPC_MAX_FDLIST      16
  30 #define FASTRPC_MAX_CRCLIST     64
  31 #define FASTRPC_PHYS(p) ((p) & 0xffffffff)
  32 #define FASTRPC_CTX_MAX (256)
  33 #define FASTRPC_INIT_HANDLE     1
  34 #define FASTRPC_CTXID_MASK (0xFF0)
  35 #define INIT_FILELEN_MAX (64 * 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_overlap {
 108         u64 start;
 109         u64 end;
 110         int raix;
 111         u64 mstart;
 112         u64 mend;
 113         u64 offset;
 114 };
 115
 116 struct fastrpc_buf {
 117         struct fastrpc_user *fl;
 118         struct dma_buf *dmabuf;
 119         struct device *dev;
 120         void *virt;
 121         u64 phys;
 122         u64 size;
 123         /* Lock for dma buf attachments */
 124         struct mutex lock;
 125         struct list_head attachments;
 126 };
 127
 128 struct fastrpc_dma_buf_attachment {
 129         struct device *dev;
 130         struct sg_table sgt;
 131         struct list_head node;
 132 };
 133
 134 struct fastrpc_map {
 135         struct list_head node;
 136         struct fastrpc_user *fl;
 137         int fd;
 138         struct dma_buf *buf;
 139         struct sg_table *table;
 140         struct dma_buf_attachment *attach;
 141         u64 phys;
 142         u64 size;
 143         void *va;
 144         u64 len;
 145         struct kref refcount;
 146 };
 147
 148 struct fastrpc_invoke_ctx {
 149         int nscalars;
 150         int nbufs;
 151         int retval;
 152         int pid;
 153         int tgid;
 154         u32 sc;
 155         u32 *crc;
 156         u64 ctxid;
 157         u64 msg_sz;
 158         struct kref refcount;
 159         struct list_head node; /* list of ctxs */
 160         struct completion work;
 161         struct work_struct put_work;
 162         struct fastrpc_msg msg;
 163         struct fastrpc_user *fl;
 164         struct fastrpc_remote_arg *rpra;
 165         struct fastrpc_map **maps;
 166         struct fastrpc_buf *buf;
 167         struct fastrpc_invoke_args *args;
 168         struct fastrpc_buf_overlap *olaps;
 169         struct fastrpc_channel_ctx *cctx;
 170 };
 171
 172 struct fastrpc_session_ctx {
 173         struct device *dev;
 174         int sid;
 175         bool used;
 176         bool valid;
 177 };
 178
 179 struct fastrpc_channel_ctx {
 180         int domain_id;
 181         int sesscount;
 182         struct rpmsg_device *rpdev;
 183         struct fastrpc_session_ctx session[FASTRPC_MAX_SESSIONS];
 184         spinlock_t lock;
 185         struct idr ctx_idr;
 186         struct list_head users;
 187         struct miscdevice miscdev;
 188         struct kref refcount;
 189 };
 190
 191 struct fastrpc_user {
 192         struct list_head user;
 193         struct list_head maps;
 194         struct list_head pending;
 195
 196         struct fastrpc_channel_ctx *cctx;
 197         struct fastrpc_session_ctx *sctx;
 198         struct fastrpc_buf *init_mem;
 199
 200         int tgid;
 201         int pd;
 202         /* Lock for lists */
 203         spinlock_t lock;
 204         /* lock for allocations */
 205         struct mutex mutex;
 206 };
 207
 208 static void fastrpc_free_map(struct kref *ref)
 209 {
 210         struct fastrpc_map *map;
 211
 212         map = container_of(ref, struct fastrpc_map, refcount);
 213
 214         if (map->table) {
 215                 dma_buf_unmap_attachment(map->attach, map->table,
 216                                          DMA_BIDIRECTIONAL);
 217                 dma_buf_detach(map->buf, map->attach);
 218                 dma_buf_put(map->buf);
 219         }
 220
 221         kfree(map);
 222 }
 223
 224 static void fastrpc_map_put(struct fastrpc_map *map)
 225 {
 226         if (map)
 227                 kref_put(&map->refcount, fastrpc_free_map);
 228 }
 229
 230 static void fastrpc_map_get(struct fastrpc_map *map)
 231 {
 232         if (map)
 233                 kref_get(&map->refcount);
 234 }
 235
 236 static int fastrpc_map_find(struct fastrpc_user *fl, int fd,
 237                             struct fastrpc_map **ppmap)
 238 {
 239         struct fastrpc_map *map = NULL;
 240
 241         mutex_lock(&fl->mutex);
 242         list_for_each_entry(map, &fl->maps, node) {
 243                 if (map->fd == fd) {
 244                         fastrpc_map_get(map);
 245                         *ppmap = map;
 246                         mutex_unlock(&fl->mutex);
 247                         return 0;
 248                 }
 249         }
 250         mutex_unlock(&fl->mutex);
 251
 252         return -ENOENT;
 253 }
 254
 255 static void fastrpc_buf_free(struct fastrpc_buf *buf)
 256 {
 257         dma_free_coherent(buf->dev, buf->size, buf->virt,
 258                           FASTRPC_PHYS(buf->phys));
 259         kfree(buf);
 260 }
 261
 262 static int fastrpc_buf_alloc(struct fastrpc_user *fl, struct device *dev,
 263                              u64 size, struct fastrpc_buf **obuf)
 264 {
 265         struct fastrpc_buf *buf;
 266
 267         buf = kzalloc(sizeof(*buf), GFP_KERNEL);
 268         if (!buf)
 269                 return -ENOMEM;
 270
 271         INIT_LIST_HEAD(&buf->attachments);
 272         mutex_init(&buf->lock);
 273
 274         buf->fl = fl;
 275         buf->virt = NULL;
 276         buf->phys = 0;
 277         buf->size = size;
 278         buf->dev = dev;
 279
 280         buf->virt = dma_alloc_coherent(dev, buf->size, (dma_addr_t *)&buf->phys,
 281                                        GFP_KERNEL);
 282         if (!buf->virt) {
 283                 mutex_destroy(&buf->lock);
 284                 kfree(buf);
 285                 return -ENOMEM;
 286         }
 287
 288         if (fl->sctx && fl->sctx->sid)
 289                 buf->phys += ((u64)fl->sctx->sid << 32);
 290
 291         *obuf = buf;
 292
 293         return 0;
 294 }
 295
 296 static void fastrpc_channel_ctx_free(struct kref *ref)
 297 {
 298         struct fastrpc_channel_ctx *cctx;
 299
 300         cctx = container_of(ref, struct fastrpc_channel_ctx, refcount);
 301
 302         kfree(cctx);
 303 }
 304
 305 static void fastrpc_channel_ctx_get(struct fastrpc_channel_ctx *cctx)
 306 {
 307         kref_get(&cctx->refcount);
 308 }
 309
 310 static void fastrpc_channel_ctx_put(struct fastrpc_channel_ctx *cctx)
 311 {
 312         kref_put(&cctx->refcount, fastrpc_channel_ctx_free);
 313 }
 314
 315 static void fastrpc_context_free(struct kref *ref)
 316 {
 317         struct fastrpc_invoke_ctx *ctx;
 318         struct fastrpc_channel_ctx *cctx;
 319         unsigned long flags;
 320         int i;
 321
 322         ctx = container_of(ref, struct fastrpc_invoke_ctx, refcount);
 323         cctx = ctx->cctx;
 324
 325         for (i = 0; i < ctx->nscalars; i++)
 326                 fastrpc_map_put(ctx->maps[i]);
 327
 328         if (ctx->buf)
 329                 fastrpc_buf_free(ctx->buf);
 330
 331         spin_lock_irqsave(&cctx->lock, flags);
 332         idr_remove(&cctx->ctx_idr, ctx->ctxid >> 4);
 333         spin_unlock_irqrestore(&cctx->lock, flags);
 334
 335         kfree(ctx->maps);
 336         kfree(ctx->olaps);
 337         kfree(ctx);
 338
 339         fastrpc_channel_ctx_put(cctx);
 340 }
 341
 342 static void fastrpc_context_get(struct fastrpc_invoke_ctx *ctx)
 343 {
 344         kref_get(&ctx->refcount);
 345 }
 346
 347 static void fastrpc_context_put(struct fastrpc_invoke_ctx *ctx)
 348 {
 349         kref_put(&ctx->refcount, fastrpc_context_free);
 350 }
 351
 352 static void fastrpc_context_put_wq(struct work_struct *work)
 353 {
 354         struct fastrpc_invoke_ctx *ctx =
 355                         container_of(work, struct fastrpc_invoke_ctx, put_work);
 356
 357         fastrpc_context_put(ctx);
 358 }
 359
 360 #define CMP(aa, bb) ((aa) == (bb) ? 0 : (aa) < (bb) ? -1 : 1)
 361 static int olaps_cmp(const void *a, const void *b)
 362 {
 363         struct fastrpc_buf_overlap *pa = (struct fastrpc_buf_overlap *)a;
 364         struct fastrpc_buf_overlap *pb = (struct fastrpc_buf_overlap *)b;
 365         /* sort with lowest starting buffer first */
 366         int st = CMP(pa->start, pb->start);
 367         /* sort with highest ending buffer first */
 368         int ed = CMP(pb->end, pa->end);
 369
 370         return st == 0 ? ed : st;
 371 }
 372
 373 static void fastrpc_get_buff_overlaps(struct fastrpc_invoke_ctx *ctx)
 374 {
 375         u64 max_end = 0;
 376         int i;
 377
 378         for (i = 0; i < ctx->nbufs; ++i) {
 379                 ctx->olaps[i].start = ctx->args[i].ptr;
 380                 ctx->olaps[i].end = ctx->olaps[i].start + ctx->args[i].length;
 381                 ctx->olaps[i].raix = i;
 382         }
 383
 384         sort(ctx->olaps, ctx->nbufs, sizeof(*ctx->olaps), olaps_cmp, NULL);
 385
 386         for (i = 0; i < ctx->nbufs; ++i) {
 387                 /* Falling inside previous range */
 388                 if (ctx->olaps[i].start < max_end) {
 389                         ctx->olaps[i].mstart = max_end;
 390                         ctx->olaps[i].mend = ctx->olaps[i].end;
 391                         ctx->olaps[i].offset = max_end - ctx->olaps[i].start;
 392
 393                         if (ctx->olaps[i].end > max_end) {
 394                                 max_end = ctx->olaps[i].end;
 395                         } else {
 396                                 ctx->olaps[i].mend = 0;
 397                                 ctx->olaps[i].mstart = 0;
 398                         }
 399
 400                 } else  {
 401                         ctx->olaps[i].mend = ctx->olaps[i].end;
 402                         ctx->olaps[i].mstart = ctx->olaps[i].start;
 403                         ctx->olaps[i].offset = 0;
 404                         max_end = ctx->olaps[i].end;
 405                 }
 406         }
 407 }
 408
 409 static struct fastrpc_invoke_ctx *fastrpc_context_alloc(
 410                         struct fastrpc_user *user, u32 kernel, u32 sc,
 411                         struct fastrpc_invoke_args *args)
 412 {
 413         struct fastrpc_channel_ctx *cctx = user->cctx;
 414         struct fastrpc_invoke_ctx *ctx = NULL;
 415         unsigned long flags;
 416         int ret;
 417
 418         ctx = kzalloc(sizeof(*ctx), GFP_KERNEL);
 419         if (!ctx)
 420                 return ERR_PTR(-ENOMEM);
 421
 422         INIT_LIST_HEAD(&ctx->node);
 423         ctx->fl = user;
 424         ctx->nscalars = REMOTE_SCALARS_LENGTH(sc);
 425         ctx->nbufs = REMOTE_SCALARS_INBUFS(sc) +
 426                      REMOTE_SCALARS_OUTBUFS(sc);
 427
 428         if (ctx->nscalars) {
 429                 ctx->maps = kcalloc(ctx->nscalars,
 430                                     sizeof(*ctx->maps), GFP_KERNEL);
 431                 if (!ctx->maps) {
 432                         kfree(ctx);
 433                         return ERR_PTR(-ENOMEM);
 434                 }
 435                 ctx->olaps = kcalloc(ctx->nscalars,
 436                                     sizeof(*ctx->olaps), GFP_KERNEL);
 437                 if (!ctx->olaps) {
 438                         kfree(ctx->maps);
 439                         kfree(ctx);
 440                         return ERR_PTR(-ENOMEM);
 441                 }
 442                 ctx->args = args;
 443                 fastrpc_get_buff_overlaps(ctx);
 444         }
 445
 446         /* Released in fastrpc_context_put() */
 447         fastrpc_channel_ctx_get(cctx);
 448
 449         ctx->sc = sc;
 450         ctx->retval = -1;
 451         ctx->pid = current->pid;
 452         ctx->tgid = user->tgid;
 453         ctx->cctx = cctx;
 454         init_completion(&ctx->work);
 455         INIT_WORK(&ctx->put_work, fastrpc_context_put_wq);
 456
 457         spin_lock(&user->lock);
 458         list_add_tail(&ctx->node, &user->pending);
 459         spin_unlock(&user->lock);
 460
 461         spin_lock_irqsave(&cctx->lock, flags);
 462         ret = idr_alloc_cyclic(&cctx->ctx_idr, ctx, 1,
 463                                FASTRPC_CTX_MAX, GFP_ATOMIC);
 464         if (ret < 0) {
 465                 spin_unlock_irqrestore(&cctx->lock, flags);
 466                 goto err_idr;
 467         }
 468         ctx->ctxid = ret << 4;
 469         spin_unlock_irqrestore(&cctx->lock, flags);
 470
 471         kref_init(&ctx->refcount);
 472
 473         return ctx;
 474 err_idr:
 475         spin_lock(&user->lock);
 476         list_del(&ctx->node);
 477         spin_unlock(&user->lock);
 478         fastrpc_channel_ctx_put(cctx);
 479         kfree(ctx->maps);
 480         kfree(ctx->olaps);
 481         kfree(ctx);
 482
 483         return ERR_PTR(ret);
 484 }
 485
 486 static struct sg_table *
 487 fastrpc_map_dma_buf(struct dma_buf_attachment *attachment,
 488                     enum dma_data_direction dir)
 489 {
 490         struct fastrpc_dma_buf_attachment *a = attachment->priv;
 491         struct sg_table *table;
 492
 493         table = &a->sgt;
 494
 495         if (!dma_map_sg(attachment->dev, table->sgl, table->nents, dir))
 496                 return ERR_PTR(-ENOMEM);
 497
 498         return table;
 499 }
 500
 501 static void fastrpc_unmap_dma_buf(struct dma_buf_attachment *attach,
 502                                   struct sg_table *table,
 503                                   enum dma_data_direction dir)
 504 {
 505         dma_unmap_sg(attach->dev, table->sgl, table->nents, dir);
 506 }
 507
 508 static void fastrpc_release(struct dma_buf *dmabuf)
 509 {
 510         struct fastrpc_buf *buffer = dmabuf->priv;
 511
 512         fastrpc_buf_free(buffer);
 513 }
 514
 515 static int fastrpc_dma_buf_attach(struct dma_buf *dmabuf,
 516                                   struct dma_buf_attachment *attachment)
 517 {
 518         struct fastrpc_dma_buf_attachment *a;
 519         struct fastrpc_buf *buffer = dmabuf->priv;
 520         int ret;
 521
 522         a = kzalloc(sizeof(*a), GFP_KERNEL);
 523         if (!a)
 524                 return -ENOMEM;
 525
 526         ret = dma_get_sgtable(buffer->dev, &a->sgt, buffer->virt,
 527                               FASTRPC_PHYS(buffer->phys), buffer->size);
 528         if (ret < 0) {
 529                 dev_err(buffer->dev, "failed to get scatterlist from DMA API\n");
 530                 return -EINVAL;
 531         }
 532
 533         a->dev = attachment->dev;
 534         INIT_LIST_HEAD(&a->node);
 535         attachment->priv = a;
 536
 537         mutex_lock(&buffer->lock);
 538         list_add(&a->node, &buffer->attachments);
 539         mutex_unlock(&buffer->lock);
 540
 541         return 0;
 542 }
 543
 544 static void fastrpc_dma_buf_detatch(struct dma_buf *dmabuf,
 545                                     struct dma_buf_attachment *attachment)
 546 {
 547         struct fastrpc_dma_buf_attachment *a = attachment->priv;
 548         struct fastrpc_buf *buffer = dmabuf->priv;
 549
 550         mutex_lock(&buffer->lock);
 551         list_del(&a->node);
 552         mutex_unlock(&buffer->lock);
 553         sg_free_table(&a->sgt);
 554         kfree(a);
 555 }
 556
 557 static void *fastrpc_kmap(struct dma_buf *dmabuf, unsigned long pgnum)
 558 {
 559         struct fastrpc_buf *buf = dmabuf->priv;
 560
 561         return buf->virt ? buf->virt + pgnum * PAGE_SIZE : NULL;
 562 }
 563
 564 static void *fastrpc_vmap(struct dma_buf *dmabuf)
 565 {
 566         struct fastrpc_buf *buf = dmabuf->priv;
 567
 568         return buf->virt;
 569 }
 570
 571 static int fastrpc_mmap(struct dma_buf *dmabuf,
 572                         struct vm_area_struct *vma)
 573 {
 574         struct fastrpc_buf *buf = dmabuf->priv;
 575         size_t size = vma->vm_end - vma->vm_start;
 576
 577         return dma_mmap_coherent(buf->dev, vma, buf->virt,
 578                                  FASTRPC_PHYS(buf->phys), size);
 579 }
 580
 581 static const struct dma_buf_ops fastrpc_dma_buf_ops = {
 582         .attach = fastrpc_dma_buf_attach,
 583         .detach = fastrpc_dma_buf_detatch,
 584         .map_dma_buf = fastrpc_map_dma_buf,
 585         .unmap_dma_buf = fastrpc_unmap_dma_buf,
 586         .mmap = fastrpc_mmap,
 587         .map = fastrpc_kmap,
 588         .vmap = fastrpc_vmap,
 589         .release = fastrpc_release,
 590 };
 591
 592 static int fastrpc_map_create(struct fastrpc_user *fl, int fd,
 593                               u64 len, struct fastrpc_map **ppmap)
 594 {
 595         struct fastrpc_session_ctx *sess = fl->sctx;
 596         struct fastrpc_map *map = NULL;
 597         int err = 0;
 598
 599         if (!fastrpc_map_find(fl, fd, ppmap))
 600                 return 0;
 601
 602         map = kzalloc(sizeof(*map), GFP_KERNEL);
 603         if (!map)
 604                 return -ENOMEM;
 605
 606         INIT_LIST_HEAD(&map->node);
 607         map->fl = fl;
 608         map->fd = fd;
 609         map->buf = dma_buf_get(fd);
 610         if (IS_ERR(map->buf)) {
 611                 err = PTR_ERR(map->buf);
 612                 goto get_err;
 613         }
 614
 615         map->attach = dma_buf_attach(map->buf, sess->dev);
 616         if (IS_ERR(map->attach)) {
 617                 dev_err(sess->dev, "Failed to attach dmabuf\n");
 618                 err = PTR_ERR(map->attach);
 619                 goto attach_err;
 620         }
 621
 622         map->table = dma_buf_map_attachment(map->attach, DMA_BIDIRECTIONAL);
 623         if (IS_ERR(map->table)) {
 624                 err = PTR_ERR(map->table);
 625                 goto map_err;
 626         }
 627
 628         map->phys = sg_dma_address(map->table->sgl);
 629         map->phys += ((u64)fl->sctx->sid << 32);
 630         map->size = len;
 631         map->va = sg_virt(map->table->sgl);
 632         map->len = len;
 633         kref_init(&map->refcount);
 634
 635         spin_lock(&fl->lock);
 636         list_add_tail(&map->node, &fl->maps);
 637         spin_unlock(&fl->lock);
 638         *ppmap = map;
 639
 640         return 0;
 641
 642 map_err:
 643         dma_buf_detach(map->buf, map->attach);
 644 attach_err:
 645         dma_buf_put(map->buf);
 646 get_err:
 647         kfree(map);
 648
 649         return err;
 650 }
 651
 652 /*
 653  * Fastrpc payload buffer with metadata looks like:
 654  *
 655  * >>>>>>  START of METADATA <<<<<<<<<
 656  * +---------------------------------+
 657  * |           Arguments             |
 658  * | type:(struct fastrpc_remote_arg)|
 659  * |             (0 - N)             |
 660  * +---------------------------------+
 661  * |         Invoke Buffer list      |
 662  * | type:(struct fastrpc_invoke_buf)|
 663  * |           (0 - N)               |
 664  * +---------------------------------+
 665  * |         Page info list          |
 666  * | type:(struct fastrpc_phy_page)  |
 667  * |             (0 - N)             |
 668  * +---------------------------------+
 669  * |         Optional info           |
 670  * |(can be specific to SoC/Firmware)|
 671  * +---------------------------------+
 672  * >>>>>>>>  END of METADATA <<<<<<<<<
 673  * +---------------------------------+
 674  * |         Inline ARGS             |
 675  * |            (0-N)                |
 676  * +---------------------------------+
 677  */
 678
 679 static int fastrpc_get_meta_size(struct fastrpc_invoke_ctx *ctx)
 680 {
 681         int size = 0;
 682
 683         size = (sizeof(struct fastrpc_remote_arg) +
 684                 sizeof(struct fastrpc_invoke_buf) +
 685                 sizeof(struct fastrpc_phy_page)) * ctx->nscalars +
 686                 sizeof(u64) * FASTRPC_MAX_FDLIST +
 687                 sizeof(u32) * FASTRPC_MAX_CRCLIST;
 688
 689         return size;
 690 }
 691
 692 static u64 fastrpc_get_payload_size(struct fastrpc_invoke_ctx *ctx, int metalen)
 693 {
 694         u64 size = 0;
 695         int i;
 696
 697         size = ALIGN(metalen, FASTRPC_ALIGN);
 698         for (i = 0; i < ctx->nscalars; i++) {
 699                 if (ctx->args[i].fd == 0 || ctx->args[i].fd == -1) {
 700
 701                         if (ctx->olaps[i].offset == 0)
 702                                 size = ALIGN(size, FASTRPC_ALIGN);
 703
 704                         size += (ctx->olaps[i].mend - ctx->olaps[i].mstart);
 705                 }
 706         }
 707
 708         return size;
 709 }
 710
 711 static int fastrpc_create_maps(struct fastrpc_invoke_ctx *ctx)
 712 {
 713         struct device *dev = ctx->fl->sctx->dev;
 714         int i, err;
 715
 716         for (i = 0; i < ctx->nscalars; ++i) {
 717                 /* Make sure reserved field is set to 0 */
 718                 if (ctx->args[i].reserved)
 719                         return -EINVAL;
 720
 721                 if (ctx->args[i].fd == 0 || ctx->args[i].fd == -1 ||
 722                     ctx->args[i].length == 0)
 723                         continue;
 724
 725                 err = fastrpc_map_create(ctx->fl, ctx->args[i].fd,
 726                                          ctx->args[i].length, &ctx->maps[i]);
 727                 if (err) {
 728                         dev_err(dev, "Error Creating map %d\n", err);
 729                         return -EINVAL;
 730                 }
 731
 732         }
 733         return 0;
 734 }
 735
 736 static int fastrpc_get_args(u32 kernel, struct fastrpc_invoke_ctx *ctx)
 737 {
 738         struct device *dev = ctx->fl->sctx->dev;
 739         struct fastrpc_remote_arg *rpra;
 740         struct fastrpc_invoke_buf *list;
 741         struct fastrpc_phy_page *pages;
 742         int inbufs, i, oix, err = 0;
 743         u64 len, rlen, pkt_size;
 744         u64 pg_start, pg_end;
 745         uintptr_t args;
 746         int metalen;
 747
 748         inbufs = REMOTE_SCALARS_INBUFS(ctx->sc);
 749         metalen = fastrpc_get_meta_size(ctx);
 750         pkt_size = fastrpc_get_payload_size(ctx, metalen);
 751
 752         err = fastrpc_create_maps(ctx);
 753         if (err)
 754                 return err;
 755
 756         ctx->msg_sz = pkt_size;
 757
 758         err = fastrpc_buf_alloc(ctx->fl, dev, pkt_size, &ctx->buf);
 759         if (err)
 760                 return err;
 761
 762         rpra = ctx->buf->virt;
 763         list = ctx->buf->virt + ctx->nscalars * sizeof(*rpra);
 764         pages = ctx->buf->virt + ctx->nscalars * (sizeof(*list) +
 765                 sizeof(*rpra));
 766         args = (uintptr_t)ctx->buf->virt + metalen;
 767         rlen = pkt_size - metalen;
 768         ctx->rpra = rpra;
 769
 770         for (oix = 0; oix < ctx->nbufs; ++oix) {
 771                 int mlen;
 772
 773                 i = ctx->olaps[oix].raix;
 774                 len = ctx->args[i].length;
 775
 776                 rpra[i].pv = 0;
 777                 rpra[i].len = len;
 778                 list[i].num = len ? 1 : 0;
 779                 list[i].pgidx = i;
 780
 781                 if (!len)
 782                         continue;
 783
 784                 if (ctx->maps[i]) {
 785                         struct vm_area_struct *vma = NULL;
 786
 787                         rpra[i].pv = (u64) ctx->args[i].ptr;
 788                         pages[i].addr = ctx->maps[i]->phys;
 789
 790                         vma = find_vma(current->mm, ctx->args[i].ptr);
 791                         if (vma)
 792                                 pages[i].addr += ctx->args[i].ptr -
 793                                                  vma->vm_start;
 794
 795                         pg_start = (ctx->args[i].ptr & PAGE_MASK) >> PAGE_SHIFT;
 796                         pg_end = ((ctx->args[i].ptr + len - 1) & PAGE_MASK) >>
 797                                   PAGE_SHIFT;
 798                         pages[i].size = (pg_end - pg_start + 1) * PAGE_SIZE;
 799
 800                 } else {
 801
 802                         if (ctx->olaps[oix].offset == 0) {
 803                                 rlen -= ALIGN(args, FASTRPC_ALIGN) - args;
 804                                 args = ALIGN(args, FASTRPC_ALIGN);
 805                         }
 806
 807                         mlen = ctx->olaps[oix].mend - ctx->olaps[oix].mstart;
 808
 809                         if (rlen < mlen)
 810                                 goto bail;
 811
 812                         rpra[i].pv = args - ctx->olaps[oix].offset;
 813                         pages[i].addr = ctx->buf->phys -
 814                                         ctx->olaps[oix].offset +
 815                                         (pkt_size - rlen);
 816                         pages[i].addr = pages[i].addr & PAGE_MASK;
 817
 818                         pg_start = (args & PAGE_MASK) >> PAGE_SHIFT;
 819                         pg_end = ((args + len - 1) & PAGE_MASK) >> PAGE_SHIFT;
 820                         pages[i].size = (pg_end - pg_start + 1) * PAGE_SIZE;
 821                         args = args + mlen;
 822                         rlen -= mlen;
 823                 }
 824
 825                 if (i < inbufs && !ctx->maps[i]) {
 826                         void *dst = (void *)(uintptr_t)rpra[i].pv;
 827                         void *src = (void *)(uintptr_t)ctx->args[i].ptr;
 828
 829                         if (!kernel) {
 830                                 if (copy_from_user(dst, (void __user *)src,
 831                                                    len)) {
 832                                         err = -EFAULT;
 833                                         goto bail;
 834                                 }
 835                         } else {
 836                                 memcpy(dst, src, len);
 837                         }
 838                 }
 839         }
 840
 841         for (i = ctx->nbufs; i < ctx->nscalars; ++i) {
 842                 rpra[i].pv = (u64) ctx->args[i].ptr;
 843                 rpra[i].len = ctx->args[i].length;
 844                 list[i].num = ctx->args[i].length ? 1 : 0;
 845                 list[i].pgidx = i;
 846                 pages[i].addr = ctx->maps[i]->phys;
 847                 pages[i].size = ctx->maps[i]->size;
 848         }
 849
 850 bail:
 851         if (err)
 852                 dev_err(dev, "Error: get invoke args failed:%d\n", err);
 853
 854         return err;
 855 }
 856
 857 static int fastrpc_put_args(struct fastrpc_invoke_ctx *ctx,
 858                             u32 kernel)
 859 {
 860         struct fastrpc_remote_arg *rpra = ctx->rpra;
 861         int i, inbufs;
 862
 863         inbufs = REMOTE_SCALARS_INBUFS(ctx->sc);
 864
 865         for (i = inbufs; i < ctx->nbufs; ++i) {
 866                 void *src = (void *)(uintptr_t)rpra[i].pv;
 867                 void *dst = (void *)(uintptr_t)ctx->args[i].ptr;
 868                 u64 len = rpra[i].len;
 869
 870                 if (!kernel) {
 871                         if (copy_to_user((void __user *)dst, src, len))
 872                                 return -EFAULT;
 873                 } else {
 874                         memcpy(dst, src, len);
 875                 }
 876         }
 877
 878         return 0;
 879 }
 880
 881 static int fastrpc_invoke_send(struct fastrpc_session_ctx *sctx,
 882                                struct fastrpc_invoke_ctx *ctx,
 883                                u32 kernel, uint32_t handle)
 884 {
 885         struct fastrpc_channel_ctx *cctx;
 886         struct fastrpc_user *fl = ctx->fl;
 887         struct fastrpc_msg *msg = &ctx->msg;
 888
 889         cctx = fl->cctx;
 890         msg->pid = fl->tgid;
 891         msg->tid = current->pid;
 892
 893         if (kernel)
 894                 msg->pid = 0;
 895
 896         msg->ctx = ctx->ctxid | fl->pd;
 897         msg->handle = handle;
 898         msg->sc = ctx->sc;
 899         msg->addr = ctx->buf ? ctx->buf->phys : 0;
 900         msg->size = roundup(ctx->msg_sz, PAGE_SIZE);
 901         fastrpc_context_get(ctx);
 902
 903         return rpmsg_send(cctx->rpdev->ept, (void *)msg, sizeof(*msg));
 904 }
 905
 906 static int fastrpc_internal_invoke(struct fastrpc_user *fl,  u32 kernel,
 907                                    u32 handle, u32 sc,
 908                                    struct fastrpc_invoke_args *args)
 909 {
 910         struct fastrpc_invoke_ctx *ctx = NULL;
 911         int err = 0;
 912
 913         if (!fl->sctx)
 914                 return -EINVAL;
 915
 916         if (!fl->cctx->rpdev)
 917                 return -EPIPE;
 918
 919         ctx = fastrpc_context_alloc(fl, kernel, sc, args);
 920         if (IS_ERR(ctx))
 921                 return PTR_ERR(ctx);
 922
 923         if (ctx->nscalars) {
 924                 err = fastrpc_get_args(kernel, ctx);
 925                 if (err)
 926                         goto bail;
 927         }
 928
 929         /* make sure that all CPU memory writes are seen by DSP */
 930         dma_wmb();
 931         /* Send invoke buffer to remote dsp */
 932         err = fastrpc_invoke_send(fl->sctx, ctx, kernel, handle);
 933         if (err)
 934                 goto bail;
 935
 936         /* Wait for remote dsp to respond or time out */
 937         err = wait_for_completion_interruptible(&ctx->work);
 938         if (err)
 939                 goto bail;
 940
 941         /* Check the response from remote dsp */
 942         err = ctx->retval;
 943         if (err)
 944                 goto bail;
 945
 946         if (ctx->nscalars) {
 947                 /* make sure that all memory writes by DSP are seen by CPU */
 948                 dma_rmb();
 949                 /* populate all the output buffers with results */
 950                 err = fastrpc_put_args(ctx, kernel);
 951                 if (err)
 952                         goto bail;
 953         }
 954
 955 bail:
 956         /* We are done with this compute context, remove it from pending list */
 957         spin_lock(&fl->lock);
 958         list_del(&ctx->node);
 959         spin_unlock(&fl->lock);
 960         fastrpc_context_put(ctx);
 961
 962         if (err)
 963                 dev_dbg(fl->sctx->dev, "Error: Invoke Failed %d\n", err);
 964
 965         return err;
 966 }
 967
 968 static int fastrpc_init_create_process(struct fastrpc_user *fl,
 969                                         char __user *argp)
 970 {
 971         struct fastrpc_init_create init;
 972         struct fastrpc_invoke_args *args;
 973         struct fastrpc_phy_page pages[1];
 974         struct fastrpc_map *map = NULL;
 975         struct fastrpc_buf *imem = NULL;
 976         int memlen;
 977         int err;
 978         struct {
 979                 int pgid;
 980                 u32 namelen;
 981                 u32 filelen;
 982                 u32 pageslen;
 983                 u32 attrs;
 984                 u32 siglen;
 985         } inbuf;
 986         u32 sc;
 987
 988         args = kcalloc(FASTRPC_CREATE_PROCESS_NARGS, sizeof(*args), GFP_KERNEL);
 989         if (!args)
 990                 return -ENOMEM;
 991
 992         if (copy_from_user(&init, argp, sizeof(init))) {
 993                 err = -EFAULT;
 994                 goto err;
 995         }
 996
 997         if (init.filelen > INIT_FILELEN_MAX) {
 998                 err = -EINVAL;
 999                 goto err;
1000         }
1001
1002         inbuf.pgid = fl->tgid;
1003         inbuf.namelen = strlen(current->comm) + 1;
1004         inbuf.filelen = init.filelen;
1005         inbuf.pageslen = 1;
1006         inbuf.attrs = init.attrs;
1007         inbuf.siglen = init.siglen;
1008         fl->pd = 1;
1009
1010         if (init.filelen && init.filefd) {
1011                 err = fastrpc_map_create(fl, init.filefd, init.filelen, &map);
1012                 if (err)
1013                         goto err;
1014         }
1015
1016         memlen = ALIGN(max(INIT_FILELEN_MAX, (int)init.filelen * 4),
1017                        1024 * 1024);
1018         err = fastrpc_buf_alloc(fl, fl->sctx->dev, memlen,
1019                                 &imem);
1020         if (err)
1021                 goto err_alloc;
1022
1023         fl->init_mem = imem;
1024         args[0].ptr = (u64)(uintptr_t)&inbuf;
1025         args[0].length = sizeof(inbuf);
1026         args[0].fd = -1;
1027
1028         args[1].ptr = (u64)(uintptr_t)current->comm;
1029         args[1].length = inbuf.namelen;
1030         args[1].fd = -1;
1031
1032         args[2].ptr = (u64) init.file;
1033         args[2].length = inbuf.filelen;
1034         args[2].fd = init.filefd;
1035
1036         pages[0].addr = imem->phys;
1037         pages[0].size = imem->size;
1038
1039         args[3].ptr = (u64)(uintptr_t) pages;
1040         args[3].length = 1 * sizeof(*pages);
1041         args[3].fd = -1;
1042
1043         args[4].ptr = (u64)(uintptr_t)&inbuf.attrs;
1044         args[4].length = sizeof(inbuf.attrs);
1045         args[4].fd = -1;
1046
1047         args[5].ptr = (u64)(uintptr_t) &inbuf.siglen;
1048         args[5].length = sizeof(inbuf.siglen);
1049         args[5].fd = -1;
1050
1051         sc = FASTRPC_SCALARS(FASTRPC_RMID_INIT_CREATE, 4, 0);
1052         if (init.attrs)
1053                 sc = FASTRPC_SCALARS(FASTRPC_RMID_INIT_CREATE_ATTR, 6, 0);
1054
1055         err = fastrpc_internal_invoke(fl, true, FASTRPC_INIT_HANDLE,
1056                                       sc, args);
1057         if (err)
1058                 goto err_invoke;
1059
1060         kfree(args);
1061
1062         return 0;
1063
1064 err_invoke:
1065         fl->init_mem = NULL;
1066         fastrpc_buf_free(imem);
1067 err_alloc:
1068         if (map) {
1069                 spin_lock(&fl->lock);
1070                 list_del(&map->node);
1071                 spin_unlock(&fl->lock);
1072                 fastrpc_map_put(map);
1073         }
1074 err:
1075         kfree(args);
1076
1077         return err;
1078 }
1079
1080 static struct fastrpc_session_ctx *fastrpc_session_alloc(
1081                                         struct fastrpc_channel_ctx *cctx)
1082 {
1083         struct fastrpc_session_ctx *session = NULL;
1084         unsigned long flags;
1085         int i;
1086
1087         spin_lock_irqsave(&cctx->lock, flags);
1088         for (i = 0; i < cctx->sesscount; i++) {
1089                 if (!cctx->session[i].used && cctx->session[i].valid) {
1090                         cctx->session[i].used = true;
1091                         session = &cctx->session[i];
1092                         break;
1093                 }
1094         }
1095         spin_unlock_irqrestore(&cctx->lock, flags);
1096
1097         return session;
1098 }
1099
1100 static void fastrpc_session_free(struct fastrpc_channel_ctx *cctx,
1101                                  struct fastrpc_session_ctx *session)
1102 {
1103         unsigned long flags;
1104
1105         spin_lock_irqsave(&cctx->lock, flags);
1106         session->used = false;
1107         spin_unlock_irqrestore(&cctx->lock, flags);
1108 }
1109
1110 static int fastrpc_release_current_dsp_process(struct fastrpc_user *fl)
1111 {
1112         struct fastrpc_invoke_args args[1];
1113         int tgid = 0;
1114         u32 sc;
1115
1116         tgid = fl->tgid;
1117         args[0].ptr = (u64)(uintptr_t) &tgid;
1118         args[0].length = sizeof(tgid);
1119         args[0].fd = -1;
1120         args[0].reserved = 0;
1121         sc = FASTRPC_SCALARS(FASTRPC_RMID_INIT_RELEASE, 1, 0);
1122
1123         return fastrpc_internal_invoke(fl, true, FASTRPC_INIT_HANDLE,
1124                                        sc, &args[0]);
1125 }
1126
1127 static int fastrpc_device_release(struct inode *inode, struct file *file)
1128 {
1129         struct fastrpc_user *fl = (struct fastrpc_user *)file->private_data;
1130         struct fastrpc_channel_ctx *cctx = fl->cctx;
1131         struct fastrpc_invoke_ctx *ctx, *n;
1132         struct fastrpc_map *map, *m;
1133         unsigned long flags;
1134
1135         fastrpc_release_current_dsp_process(fl);
1136
1137         spin_lock_irqsave(&cctx->lock, flags);
1138         list_del(&fl->user);
1139         spin_unlock_irqrestore(&cctx->lock, flags);
1140
1141         if (fl->init_mem)
1142                 fastrpc_buf_free(fl->init_mem);
1143
1144         list_for_each_entry_safe(ctx, n, &fl->pending, node) {
1145                 list_del(&ctx->node);
1146                 fastrpc_context_put(ctx);
1147         }
1148
1149         list_for_each_entry_safe(map, m, &fl->maps, node) {
1150                 list_del(&map->node);
1151                 fastrpc_map_put(map);
1152         }
1153
1154         fastrpc_session_free(cctx, fl->sctx);
1155         fastrpc_channel_ctx_put(cctx);
1156
1157         mutex_destroy(&fl->mutex);
1158         kfree(fl);
1159         file->private_data = NULL;
1160
1161         return 0;
1162 }
1163
1164 static int fastrpc_device_open(struct inode *inode, struct file *filp)
1165 {
1166         struct fastrpc_channel_ctx *cctx = miscdev_to_cctx(filp->private_data);
1167         struct fastrpc_user *fl = NULL;
1168         unsigned long flags;
1169
1170         fl = kzalloc(sizeof(*fl), GFP_KERNEL);
1171         if (!fl)
1172                 return -ENOMEM;
1173
1174         /* Released in fastrpc_device_release() */
1175         fastrpc_channel_ctx_get(cctx);
1176
1177         filp->private_data = fl;
1178         spin_lock_init(&fl->lock);
1179         mutex_init(&fl->mutex);
1180         INIT_LIST_HEAD(&fl->pending);
1181         INIT_LIST_HEAD(&fl->maps);
1182         INIT_LIST_HEAD(&fl->user);
1183         fl->tgid = current->tgid;
1184         fl->cctx = cctx;
1185
1186         fl->sctx = fastrpc_session_alloc(cctx);
1187         if (!fl->sctx) {
1188                 dev_err(&cctx->rpdev->dev, "No session available\n");
1189                 mutex_destroy(&fl->mutex);
1190                 kfree(fl);
1191
1192                 return -EBUSY;
1193         }
1194
1195         spin_lock_irqsave(&cctx->lock, flags);
1196         list_add_tail(&fl->user, &cctx->users);
1197         spin_unlock_irqrestore(&cctx->lock, flags);
1198
1199         return 0;
1200 }
1201
1202 static int fastrpc_dmabuf_alloc(struct fastrpc_user *fl, char __user *argp)
1203 {
1204         struct fastrpc_alloc_dma_buf bp;
1205         DEFINE_DMA_BUF_EXPORT_INFO(exp_info);
1206         struct fastrpc_buf *buf = NULL;
1207         int err;
1208
1209         if (copy_from_user(&bp, argp, sizeof(bp)))
1210                 return -EFAULT;
1211
1212         err = fastrpc_buf_alloc(fl, fl->sctx->dev, bp.size, &buf);
1213         if (err)
1214                 return err;
1215         exp_info.ops = &fastrpc_dma_buf_ops;
1216         exp_info.size = bp.size;
1217         exp_info.flags = O_RDWR;
1218         exp_info.priv = buf;
1219         buf->dmabuf = dma_buf_export(&exp_info);
1220         if (IS_ERR(buf->dmabuf)) {
1221                 err = PTR_ERR(buf->dmabuf);
1222                 fastrpc_buf_free(buf);
1223                 return err;
1224         }
1225
1226         bp.fd = dma_buf_fd(buf->dmabuf, O_ACCMODE);
1227         if (bp.fd < 0) {
1228                 dma_buf_put(buf->dmabuf);
1229                 return -EINVAL;
1230         }
1231
1232         if (copy_to_user(argp, &bp, sizeof(bp))) {
1233                 dma_buf_put(buf->dmabuf);
1234                 return -EFAULT;
1235         }
1236
1237         return 0;
1238 }
1239
1240 static int fastrpc_init_attach(struct fastrpc_user *fl)
1241 {
1242         struct fastrpc_invoke_args args[1];
1243         int tgid = fl->tgid;
1244         u32 sc;
1245
1246         args[0].ptr = (u64)(uintptr_t) &tgid;
1247         args[0].length = sizeof(tgid);
1248         args[0].fd = -1;
1249         args[0].reserved = 0;
1250         sc = FASTRPC_SCALARS(FASTRPC_RMID_INIT_ATTACH, 1, 0);
1251         fl->pd = 0;
1252
1253         return fastrpc_internal_invoke(fl, true, FASTRPC_INIT_HANDLE,
1254                                        sc, &args[0]);
1255 }
1256
1257 static int fastrpc_invoke(struct fastrpc_user *fl, char __user *argp)
1258 {
1259         struct fastrpc_invoke_args *args = NULL;
1260         struct fastrpc_invoke inv;
1261         u32 nscalars;
1262         int err;
1263
1264         if (copy_from_user(&inv, argp, sizeof(inv)))
1265                 return -EFAULT;
1266
1267         /* nscalars is truncated here to max supported value */
1268         nscalars = REMOTE_SCALARS_LENGTH(inv.sc);
1269         if (nscalars) {
1270                 args = kcalloc(nscalars, sizeof(*args), GFP_KERNEL);
1271                 if (!args)
1272                         return -ENOMEM;
1273
1274                 if (copy_from_user(args, (void __user *)(uintptr_t)inv.args,
1275                                    nscalars * sizeof(*args))) {
1276                         kfree(args);
1277                         return -EFAULT;
1278                 }
1279         }
1280
1281         err = fastrpc_internal_invoke(fl, false, inv.handle, inv.sc, args);
1282         kfree(args);
1283
1284         return err;
1285 }
1286
1287 static long fastrpc_device_ioctl(struct file *file, unsigned int cmd,
1288                                  unsigned long arg)
1289 {
1290         struct fastrpc_user *fl = (struct fastrpc_user *)file->private_data;
1291         char __user *argp = (char __user *)arg;
1292         int err;
1293
1294         switch (cmd) {
1295         case FASTRPC_IOCTL_INVOKE:
1296                 err = fastrpc_invoke(fl, argp);
1297                 break;
1298         case FASTRPC_IOCTL_INIT_ATTACH:
1299                 err = fastrpc_init_attach(fl);
1300                 break;
1301         case FASTRPC_IOCTL_INIT_CREATE:
1302                 err = fastrpc_init_create_process(fl, argp);
1303                 break;
1304         case FASTRPC_IOCTL_ALLOC_DMA_BUFF:
1305                 err = fastrpc_dmabuf_alloc(fl, argp);
1306                 break;
1307         default:
1308                 err = -ENOTTY;
1309                 break;
1310         }
1311
1312         return err;
1313 }
1314
1315 static const struct file_operations fastrpc_fops = {
1316         .open = fastrpc_device_open,
1317         .release = fastrpc_device_release,
1318         .unlocked_ioctl = fastrpc_device_ioctl,
1319         .compat_ioctl = fastrpc_device_ioctl,
1320 };
1321
1322 static int fastrpc_cb_probe(struct platform_device *pdev)
1323 {
1324         struct fastrpc_channel_ctx *cctx;
1325         struct fastrpc_session_ctx *sess;
1326         struct device *dev = &pdev->dev;
1327         int i, sessions = 0;
1328         unsigned long flags;
1329         int rc;
1330
1331         cctx = dev_get_drvdata(dev->parent);
1332         if (!cctx)
1333                 return -EINVAL;
1334
1335         of_property_read_u32(dev->of_node, "qcom,nsessions", &sessions);
1336
1337         spin_lock_irqsave(&cctx->lock, flags);
1338         sess = &cctx->session[cctx->sesscount];
1339         sess->used = false;
1340         sess->valid = true;
1341         sess->dev = dev;
1342         dev_set_drvdata(dev, sess);
1343
1344         if (of_property_read_u32(dev->of_node, "reg", &sess->sid))
1345                 dev_info(dev, "FastRPC Session ID not specified in DT\n");
1346
1347         if (sessions > 0) {
1348                 struct fastrpc_session_ctx *dup_sess;
1349
1350                 for (i = 1; i < sessions; i++) {
1351                         if (cctx->sesscount++ >= FASTRPC_MAX_SESSIONS)
1352                                 break;
1353                         dup_sess = &cctx->session[cctx->sesscount];
1354                         memcpy(dup_sess, sess, sizeof(*dup_sess));
1355                 }
1356         }
1357         cctx->sesscount++;
1358         spin_unlock_irqrestore(&cctx->lock, flags);
1359         rc = dma_set_mask(dev, DMA_BIT_MASK(32));
1360         if (rc) {
1361                 dev_err(dev, "32-bit DMA enable failed\n");
1362                 return rc;
1363         }
1364
1365         return 0;
1366 }
1367
1368 static int fastrpc_cb_remove(struct platform_device *pdev)
1369 {
1370         struct fastrpc_channel_ctx *cctx = dev_get_drvdata(pdev->dev.parent);
1371         struct fastrpc_session_ctx *sess = dev_get_drvdata(&pdev->dev);
1372         unsigned long flags;
1373         int i;
1374
1375         spin_lock_irqsave(&cctx->lock, flags);
1376         for (i = 1; i < FASTRPC_MAX_SESSIONS; i++) {
1377                 if (cctx->session[i].sid == sess->sid) {
1378                         cctx->session[i].valid = false;
1379                         cctx->sesscount--;
1380                 }
1381         }
1382         spin_unlock_irqrestore(&cctx->lock, flags);
1383
1384         return 0;
1385 }
1386
1387 static const struct of_device_id fastrpc_match_table[] = {
1388         { .compatible = "qcom,fastrpc-compute-cb", },
1389         {}
1390 };
1391
1392 static struct platform_driver fastrpc_cb_driver = {
1393         .probe = fastrpc_cb_probe,
1394         .remove = fastrpc_cb_remove,
1395         .driver = {
1396                 .name = "qcom,fastrpc-cb",
1397                 .of_match_table = fastrpc_match_table,
1398                 .suppress_bind_attrs = true,
1399         },
1400 };
1401
1402 static int fastrpc_rpmsg_probe(struct rpmsg_device *rpdev)
1403 {
1404         struct device *rdev = &rpdev->dev;
1405         struct fastrpc_channel_ctx *data;
1406         int i, err, domain_id = -1;
1407         const char *domain;
1408
1409         err = of_property_read_string(rdev->of_node, "label", &domain);
1410         if (err) {
1411                 dev_info(rdev, "FastRPC Domain not specified in DT\n");
1412                 return err;
1413         }
1414
1415         for (i = 0; i <= CDSP_DOMAIN_ID; i++) {
1416                 if (!strcmp(domains[i], domain)) {
1417                         domain_id = i;
1418                         break;
1419                 }
1420         }
1421
1422         if (domain_id < 0) {
1423                 dev_info(rdev, "FastRPC Invalid Domain ID %d\n", domain_id);
1424                 return -EINVAL;
1425         }
1426
1427         data = kzalloc(sizeof(*data), GFP_KERNEL);
1428         if (!data)
1429                 return -ENOMEM;
1430
1431         data->miscdev.minor = MISC_DYNAMIC_MINOR;
1432         data->miscdev.name = kasprintf(GFP_KERNEL, "fastrpc-%s",
1433                                 domains[domain_id]);
1434         data->miscdev.fops = &fastrpc_fops;
1435         err = misc_register(&data->miscdev);
1436         if (err)
1437                 return err;
1438
1439         kref_init(&data->refcount);
1440
1441         dev_set_drvdata(&rpdev->dev, data);
1442         dma_set_mask_and_coherent(rdev, DMA_BIT_MASK(32));
1443         INIT_LIST_HEAD(&data->users);
1444         spin_lock_init(&data->lock);
1445         idr_init(&data->ctx_idr);
1446         data->domain_id = domain_id;
1447         data->rpdev = rpdev;
1448
1449         return of_platform_populate(rdev->of_node, NULL, NULL, rdev);
1450 }
1451
1452 static void fastrpc_notify_users(struct fastrpc_user *user)
1453 {
1454         struct fastrpc_invoke_ctx *ctx;
1455
1456         spin_lock(&user->lock);
1457         list_for_each_entry(ctx, &user->pending, node)
1458                 complete(&ctx->work);
1459         spin_unlock(&user->lock);
1460 }
1461
1462 static void fastrpc_rpmsg_remove(struct rpmsg_device *rpdev)
1463 {
1464         struct fastrpc_channel_ctx *cctx = dev_get_drvdata(&rpdev->dev);
1465         struct fastrpc_user *user;
1466         unsigned long flags;
1467
1468         spin_lock_irqsave(&cctx->lock, flags);
1469         list_for_each_entry(user, &cctx->users, user)
1470                 fastrpc_notify_users(user);
1471         spin_unlock_irqrestore(&cctx->lock, flags);
1472
1473         misc_deregister(&cctx->miscdev);
1474         of_platform_depopulate(&rpdev->dev);
1475
1476         cctx->rpdev = NULL;
1477         fastrpc_channel_ctx_put(cctx);
1478 }
1479
1480 static int fastrpc_rpmsg_callback(struct rpmsg_device *rpdev, void *data,
1481                                   int len, void *priv, u32 addr)
1482 {
1483         struct fastrpc_channel_ctx *cctx = dev_get_drvdata(&rpdev->dev);
1484         struct fastrpc_invoke_rsp *rsp = data;
1485         struct fastrpc_invoke_ctx *ctx;
1486         unsigned long flags;
1487         unsigned long ctxid;
1488
1489         if (len < sizeof(*rsp))
1490                 return -EINVAL;
1491
1492         ctxid = ((rsp->ctx & FASTRPC_CTXID_MASK) >> 4);
1493
1494         spin_lock_irqsave(&cctx->lock, flags);
1495         ctx = idr_find(&cctx->ctx_idr, ctxid);
1496         spin_unlock_irqrestore(&cctx->lock, flags);
1497
1498         if (!ctx) {
1499                 dev_err(&rpdev->dev, "No context ID matches response\n");
1500                 return -ENOENT;
1501         }
1502
1503         ctx->retval = rsp->retval;
1504         complete(&ctx->work);
1505
1506         /*
1507          * The DMA buffer associated with the context cannot be freed in
1508          * interrupt context so schedule it through a worker thread to
1509          * avoid a kernel BUG.
1510          */
1511         schedule_work(&ctx->put_work);
1512
1513         return 0;
1514 }
1515
1516 static const struct of_device_id fastrpc_rpmsg_of_match[] = {
1517         { .compatible = "qcom,fastrpc" },
1518         { },
1519 };
1520 MODULE_DEVICE_TABLE(of, fastrpc_rpmsg_of_match);
1521
1522 static struct rpmsg_driver fastrpc_driver = {
1523         .probe = fastrpc_rpmsg_probe,
1524         .remove = fastrpc_rpmsg_remove,
1525         .callback = fastrpc_rpmsg_callback,
1526         .drv = {
1527                 .name = "qcom,fastrpc",
1528                 .of_match_table = fastrpc_rpmsg_of_match,
1529         },
1530 };
1531
1532 static int fastrpc_init(void)
1533 {
1534         int ret;
1535
1536         ret = platform_driver_register(&fastrpc_cb_driver);
1537         if (ret < 0) {
1538                 pr_err("fastrpc: failed to register cb driver\n");
1539                 return ret;
1540         }
1541
1542         ret = register_rpmsg_driver(&fastrpc_driver);
1543         if (ret < 0) {
1544                 pr_err("fastrpc: failed to register rpmsg driver\n");
1545                 platform_driver_unregister(&fastrpc_cb_driver);
1546                 return ret;
1547         }
1548
1549         return 0;
1550 }
1551 module_init(fastrpc_init);
1552
1553 static void fastrpc_exit(void)
1554 {
1555         platform_driver_unregister(&fastrpc_cb_driver);
1556         unregister_rpmsg_driver(&fastrpc_driver);
1557 }
1558 module_exit(fastrpc_exit);
1559
1560 MODULE_LICENSE("GPL v2");