root/drivers/misc/fastrpc.c

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DEFINITIONS

This source file includes following definitions.
  1. fastrpc_free_map
  2. fastrpc_map_put
  3. fastrpc_map_get
  4. fastrpc_map_find
  5. fastrpc_buf_free
  6. fastrpc_buf_alloc
  7. fastrpc_channel_ctx_free
  8. fastrpc_channel_ctx_get
  9. fastrpc_channel_ctx_put
  10. fastrpc_context_free
  11. fastrpc_context_get
  12. fastrpc_context_put
  13. fastrpc_context_put_wq
  14. olaps_cmp
  15. fastrpc_get_buff_overlaps
  16. fastrpc_context_alloc
  17. fastrpc_map_dma_buf
  18. fastrpc_unmap_dma_buf
  19. fastrpc_release
  20. fastrpc_dma_buf_attach
  21. fastrpc_dma_buf_detatch
  22. fastrpc_kmap
  23. fastrpc_vmap
  24. fastrpc_mmap
  25. fastrpc_map_create
  26. fastrpc_get_meta_size
  27. fastrpc_get_payload_size
  28. fastrpc_create_maps
  29. fastrpc_get_args
  30. fastrpc_put_args
  31. fastrpc_invoke_send
  32. fastrpc_internal_invoke
  33. fastrpc_init_create_process
  34. fastrpc_session_alloc
  35. fastrpc_session_free
  36. fastrpc_release_current_dsp_process
  37. fastrpc_device_release
  38. fastrpc_device_open
  39. fastrpc_dmabuf_alloc
  40. fastrpc_init_attach
  41. fastrpc_invoke
  42. fastrpc_device_ioctl
  43. fastrpc_cb_probe
  44. fastrpc_cb_remove
  45. fastrpc_rpmsg_probe
  46. fastrpc_notify_users
  47. fastrpc_rpmsg_remove
  48. fastrpc_rpmsg_callback
  49. fastrpc_init
  50. fastrpc_exit

   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                 kfree(a);
 531                 return -EINVAL;
 532         }
 533 
 534         a->dev = attachment->dev;
 535         INIT_LIST_HEAD(&a->node);
 536         attachment->priv = a;
 537 
 538         mutex_lock(&buffer->lock);
 539         list_add(&a->node, &buffer->attachments);
 540         mutex_unlock(&buffer->lock);
 541 
 542         return 0;
 543 }
 544 
 545 static void fastrpc_dma_buf_detatch(struct dma_buf *dmabuf,
 546                                     struct dma_buf_attachment *attachment)
 547 {
 548         struct fastrpc_dma_buf_attachment *a = attachment->priv;
 549         struct fastrpc_buf *buffer = dmabuf->priv;
 550 
 551         mutex_lock(&buffer->lock);
 552         list_del(&a->node);
 553         mutex_unlock(&buffer->lock);
 554         sg_free_table(&a->sgt);
 555         kfree(a);
 556 }
 557 
 558 static void *fastrpc_kmap(struct dma_buf *dmabuf, unsigned long pgnum)
 559 {
 560         struct fastrpc_buf *buf = dmabuf->priv;
 561 
 562         return buf->virt ? buf->virt + pgnum * PAGE_SIZE : NULL;
 563 }
 564 
 565 static void *fastrpc_vmap(struct dma_buf *dmabuf)
 566 {
 567         struct fastrpc_buf *buf = dmabuf->priv;
 568 
 569         return buf->virt;
 570 }
 571 
 572 static int fastrpc_mmap(struct dma_buf *dmabuf,
 573                         struct vm_area_struct *vma)
 574 {
 575         struct fastrpc_buf *buf = dmabuf->priv;
 576         size_t size = vma->vm_end - vma->vm_start;
 577 
 578         return dma_mmap_coherent(buf->dev, vma, buf->virt,
 579                                  FASTRPC_PHYS(buf->phys), size);
 580 }
 581 
 582 static const struct dma_buf_ops fastrpc_dma_buf_ops = {
 583         .attach = fastrpc_dma_buf_attach,
 584         .detach = fastrpc_dma_buf_detatch,
 585         .map_dma_buf = fastrpc_map_dma_buf,
 586         .unmap_dma_buf = fastrpc_unmap_dma_buf,
 587         .mmap = fastrpc_mmap,
 588         .map = fastrpc_kmap,
 589         .vmap = fastrpc_vmap,
 590         .release = fastrpc_release,
 591 };
 592 
 593 static int fastrpc_map_create(struct fastrpc_user *fl, int fd,
 594                               u64 len, struct fastrpc_map **ppmap)
 595 {
 596         struct fastrpc_session_ctx *sess = fl->sctx;
 597         struct fastrpc_map *map = NULL;
 598         int err = 0;
 599 
 600         if (!fastrpc_map_find(fl, fd, ppmap))
 601                 return 0;
 602 
 603         map = kzalloc(sizeof(*map), GFP_KERNEL);
 604         if (!map)
 605                 return -ENOMEM;
 606 
 607         INIT_LIST_HEAD(&map->node);
 608         map->fl = fl;
 609         map->fd = fd;
 610         map->buf = dma_buf_get(fd);
 611         if (IS_ERR(map->buf)) {
 612                 err = PTR_ERR(map->buf);
 613                 goto get_err;
 614         }
 615 
 616         map->attach = dma_buf_attach(map->buf, sess->dev);
 617         if (IS_ERR(map->attach)) {
 618                 dev_err(sess->dev, "Failed to attach dmabuf\n");
 619                 err = PTR_ERR(map->attach);
 620                 goto attach_err;
 621         }
 622 
 623         map->table = dma_buf_map_attachment(map->attach, DMA_BIDIRECTIONAL);
 624         if (IS_ERR(map->table)) {
 625                 err = PTR_ERR(map->table);
 626                 goto map_err;
 627         }
 628 
 629         map->phys = sg_dma_address(map->table->sgl);
 630         map->phys += ((u64)fl->sctx->sid << 32);
 631         map->size = len;
 632         map->va = sg_virt(map->table->sgl);
 633         map->len = len;
 634         kref_init(&map->refcount);
 635 
 636         spin_lock(&fl->lock);
 637         list_add_tail(&map->node, &fl->maps);
 638         spin_unlock(&fl->lock);
 639         *ppmap = map;
 640 
 641         return 0;
 642 
 643 map_err:
 644         dma_buf_detach(map->buf, map->attach);
 645 attach_err:
 646         dma_buf_put(map->buf);
 647 get_err:
 648         kfree(map);
 649 
 650         return err;
 651 }
 652 
 653 /*
 654  * Fastrpc payload buffer with metadata looks like:
 655  *
 656  * >>>>>>  START of METADATA <<<<<<<<<
 657  * +---------------------------------+
 658  * |           Arguments             |
 659  * | type:(struct fastrpc_remote_arg)|
 660  * |             (0 - N)             |
 661  * +---------------------------------+
 662  * |         Invoke Buffer list      |
 663  * | type:(struct fastrpc_invoke_buf)|
 664  * |           (0 - N)               |
 665  * +---------------------------------+
 666  * |         Page info list          |
 667  * | type:(struct fastrpc_phy_page)  |
 668  * |             (0 - N)             |
 669  * +---------------------------------+
 670  * |         Optional info           |
 671  * |(can be specific to SoC/Firmware)|
 672  * +---------------------------------+
 673  * >>>>>>>>  END of METADATA <<<<<<<<<
 674  * +---------------------------------+
 675  * |         Inline ARGS             |
 676  * |            (0-N)                |
 677  * +---------------------------------+
 678  */
 679 
 680 static int fastrpc_get_meta_size(struct fastrpc_invoke_ctx *ctx)
 681 {
 682         int size = 0;
 683 
 684         size = (sizeof(struct fastrpc_remote_arg) +
 685                 sizeof(struct fastrpc_invoke_buf) +
 686                 sizeof(struct fastrpc_phy_page)) * ctx->nscalars +
 687                 sizeof(u64) * FASTRPC_MAX_FDLIST +
 688                 sizeof(u32) * FASTRPC_MAX_CRCLIST;
 689 
 690         return size;
 691 }
 692 
 693 static u64 fastrpc_get_payload_size(struct fastrpc_invoke_ctx *ctx, int metalen)
 694 {
 695         u64 size = 0;
 696         int i;
 697 
 698         size = ALIGN(metalen, FASTRPC_ALIGN);
 699         for (i = 0; i < ctx->nscalars; i++) {
 700                 if (ctx->args[i].fd == 0 || ctx->args[i].fd == -1) {
 701 
 702                         if (ctx->olaps[i].offset == 0)
 703                                 size = ALIGN(size, FASTRPC_ALIGN);
 704 
 705                         size += (ctx->olaps[i].mend - ctx->olaps[i].mstart);
 706                 }
 707         }
 708 
 709         return size;
 710 }
 711 
 712 static int fastrpc_create_maps(struct fastrpc_invoke_ctx *ctx)
 713 {
 714         struct device *dev = ctx->fl->sctx->dev;
 715         int i, err;
 716 
 717         for (i = 0; i < ctx->nscalars; ++i) {
 718                 /* Make sure reserved field is set to 0 */
 719                 if (ctx->args[i].reserved)
 720                         return -EINVAL;
 721 
 722                 if (ctx->args[i].fd == 0 || ctx->args[i].fd == -1 ||
 723                     ctx->args[i].length == 0)
 724                         continue;
 725 
 726                 err = fastrpc_map_create(ctx->fl, ctx->args[i].fd,
 727                                          ctx->args[i].length, &ctx->maps[i]);
 728                 if (err) {
 729                         dev_err(dev, "Error Creating map %d\n", err);
 730                         return -EINVAL;
 731                 }
 732 
 733         }
 734         return 0;
 735 }
 736 
 737 static int fastrpc_get_args(u32 kernel, struct fastrpc_invoke_ctx *ctx)
 738 {
 739         struct device *dev = ctx->fl->sctx->dev;
 740         struct fastrpc_remote_arg *rpra;
 741         struct fastrpc_invoke_buf *list;
 742         struct fastrpc_phy_page *pages;
 743         int inbufs, i, oix, err = 0;
 744         u64 len, rlen, pkt_size;
 745         u64 pg_start, pg_end;
 746         uintptr_t args;
 747         int metalen;
 748 
 749         inbufs = REMOTE_SCALARS_INBUFS(ctx->sc);
 750         metalen = fastrpc_get_meta_size(ctx);
 751         pkt_size = fastrpc_get_payload_size(ctx, metalen);
 752 
 753         err = fastrpc_create_maps(ctx);
 754         if (err)
 755                 return err;
 756 
 757         ctx->msg_sz = pkt_size;
 758 
 759         err = fastrpc_buf_alloc(ctx->fl, dev, pkt_size, &ctx->buf);
 760         if (err)
 761                 return err;
 762 
 763         rpra = ctx->buf->virt;
 764         list = ctx->buf->virt + ctx->nscalars * sizeof(*rpra);
 765         pages = ctx->buf->virt + ctx->nscalars * (sizeof(*list) +
 766                 sizeof(*rpra));
 767         args = (uintptr_t)ctx->buf->virt + metalen;
 768         rlen = pkt_size - metalen;
 769         ctx->rpra = rpra;
 770 
 771         for (oix = 0; oix < ctx->nbufs; ++oix) {
 772                 int mlen;
 773 
 774                 i = ctx->olaps[oix].raix;
 775                 len = ctx->args[i].length;
 776 
 777                 rpra[i].pv = 0;
 778                 rpra[i].len = len;
 779                 list[i].num = len ? 1 : 0;
 780                 list[i].pgidx = i;
 781 
 782                 if (!len)
 783                         continue;
 784 
 785                 if (ctx->maps[i]) {
 786                         struct vm_area_struct *vma = NULL;
 787 
 788                         rpra[i].pv = (u64) ctx->args[i].ptr;
 789                         pages[i].addr = ctx->maps[i]->phys;
 790 
 791                         vma = find_vma(current->mm, ctx->args[i].ptr);
 792                         if (vma)
 793                                 pages[i].addr += ctx->args[i].ptr -
 794                                                  vma->vm_start;
 795 
 796                         pg_start = (ctx->args[i].ptr & PAGE_MASK) >> PAGE_SHIFT;
 797                         pg_end = ((ctx->args[i].ptr + len - 1) & PAGE_MASK) >>
 798                                   PAGE_SHIFT;
 799                         pages[i].size = (pg_end - pg_start + 1) * PAGE_SIZE;
 800 
 801                 } else {
 802 
 803                         if (ctx->olaps[oix].offset == 0) {
 804                                 rlen -= ALIGN(args, FASTRPC_ALIGN) - args;
 805                                 args = ALIGN(args, FASTRPC_ALIGN);
 806                         }
 807 
 808                         mlen = ctx->olaps[oix].mend - ctx->olaps[oix].mstart;
 809 
 810                         if (rlen < mlen)
 811                                 goto bail;
 812 
 813                         rpra[i].pv = args - ctx->olaps[oix].offset;
 814                         pages[i].addr = ctx->buf->phys -
 815                                         ctx->olaps[oix].offset +
 816                                         (pkt_size - rlen);
 817                         pages[i].addr = pages[i].addr & PAGE_MASK;
 818 
 819                         pg_start = (args & PAGE_MASK) >> PAGE_SHIFT;
 820                         pg_end = ((args + len - 1) & PAGE_MASK) >> PAGE_SHIFT;
 821                         pages[i].size = (pg_end - pg_start + 1) * PAGE_SIZE;
 822                         args = args + mlen;
 823                         rlen -= mlen;
 824                 }
 825 
 826                 if (i < inbufs && !ctx->maps[i]) {
 827                         void *dst = (void *)(uintptr_t)rpra[i].pv;
 828                         void *src = (void *)(uintptr_t)ctx->args[i].ptr;
 829 
 830                         if (!kernel) {
 831                                 if (copy_from_user(dst, (void __user *)src,
 832                                                    len)) {
 833                                         err = -EFAULT;
 834                                         goto bail;
 835                                 }
 836                         } else {
 837                                 memcpy(dst, src, len);
 838                         }
 839                 }
 840         }
 841 
 842         for (i = ctx->nbufs; i < ctx->nscalars; ++i) {
 843                 rpra[i].pv = (u64) ctx->args[i].ptr;
 844                 rpra[i].len = ctx->args[i].length;
 845                 list[i].num = ctx->args[i].length ? 1 : 0;
 846                 list[i].pgidx = i;
 847                 pages[i].addr = ctx->maps[i]->phys;
 848                 pages[i].size = ctx->maps[i]->size;
 849         }
 850 
 851 bail:
 852         if (err)
 853                 dev_err(dev, "Error: get invoke args failed:%d\n", err);
 854 
 855         return err;
 856 }
 857 
 858 static int fastrpc_put_args(struct fastrpc_invoke_ctx *ctx,
 859                             u32 kernel)
 860 {
 861         struct fastrpc_remote_arg *rpra = ctx->rpra;
 862         int i, inbufs;
 863 
 864         inbufs = REMOTE_SCALARS_INBUFS(ctx->sc);
 865 
 866         for (i = inbufs; i < ctx->nbufs; ++i) {
 867                 void *src = (void *)(uintptr_t)rpra[i].pv;
 868                 void *dst = (void *)(uintptr_t)ctx->args[i].ptr;
 869                 u64 len = rpra[i].len;
 870 
 871                 if (!kernel) {
 872                         if (copy_to_user((void __user *)dst, src, len))
 873                                 return -EFAULT;
 874                 } else {
 875                         memcpy(dst, src, len);
 876                 }
 877         }
 878 
 879         return 0;
 880 }
 881 
 882 static int fastrpc_invoke_send(struct fastrpc_session_ctx *sctx,
 883                                struct fastrpc_invoke_ctx *ctx,
 884                                u32 kernel, uint32_t handle)
 885 {
 886         struct fastrpc_channel_ctx *cctx;
 887         struct fastrpc_user *fl = ctx->fl;
 888         struct fastrpc_msg *msg = &ctx->msg;
 889 
 890         cctx = fl->cctx;
 891         msg->pid = fl->tgid;
 892         msg->tid = current->pid;
 893 
 894         if (kernel)
 895                 msg->pid = 0;
 896 
 897         msg->ctx = ctx->ctxid | fl->pd;
 898         msg->handle = handle;
 899         msg->sc = ctx->sc;
 900         msg->addr = ctx->buf ? ctx->buf->phys : 0;
 901         msg->size = roundup(ctx->msg_sz, PAGE_SIZE);
 902         fastrpc_context_get(ctx);
 903 
 904         return rpmsg_send(cctx->rpdev->ept, (void *)msg, sizeof(*msg));
 905 }
 906 
 907 static int fastrpc_internal_invoke(struct fastrpc_user *fl,  u32 kernel,
 908                                    u32 handle, u32 sc,
 909                                    struct fastrpc_invoke_args *args)
 910 {
 911         struct fastrpc_invoke_ctx *ctx = NULL;
 912         int err = 0;
 913 
 914         if (!fl->sctx)
 915                 return -EINVAL;
 916 
 917         if (!fl->cctx->rpdev)
 918                 return -EPIPE;
 919 
 920         ctx = fastrpc_context_alloc(fl, kernel, sc, args);
 921         if (IS_ERR(ctx))
 922                 return PTR_ERR(ctx);
 923 
 924         if (ctx->nscalars) {
 925                 err = fastrpc_get_args(kernel, ctx);
 926                 if (err)
 927                         goto bail;
 928         }
 929 
 930         /* make sure that all CPU memory writes are seen by DSP */
 931         dma_wmb();
 932         /* Send invoke buffer to remote dsp */
 933         err = fastrpc_invoke_send(fl->sctx, ctx, kernel, handle);
 934         if (err)
 935                 goto bail;
 936 
 937         /* Wait for remote dsp to respond or time out */
 938         err = wait_for_completion_interruptible(&ctx->work);
 939         if (err)
 940                 goto bail;
 941 
 942         /* Check the response from remote dsp */
 943         err = ctx->retval;
 944         if (err)
 945                 goto bail;
 946 
 947         if (ctx->nscalars) {
 948                 /* make sure that all memory writes by DSP are seen by CPU */
 949                 dma_rmb();
 950                 /* populate all the output buffers with results */
 951                 err = fastrpc_put_args(ctx, kernel);
 952                 if (err)
 953                         goto bail;
 954         }
 955 
 956 bail:
 957         /* We are done with this compute context, remove it from pending list */
 958         spin_lock(&fl->lock);
 959         list_del(&ctx->node);
 960         spin_unlock(&fl->lock);
 961         fastrpc_context_put(ctx);
 962 
 963         if (err)
 964                 dev_dbg(fl->sctx->dev, "Error: Invoke Failed %d\n", err);
 965 
 966         return err;
 967 }
 968 
 969 static int fastrpc_init_create_process(struct fastrpc_user *fl,
 970                                         char __user *argp)
 971 {
 972         struct fastrpc_init_create init;
 973         struct fastrpc_invoke_args *args;
 974         struct fastrpc_phy_page pages[1];
 975         struct fastrpc_map *map = NULL;
 976         struct fastrpc_buf *imem = NULL;
 977         int memlen;
 978         int err;
 979         struct {
 980                 int pgid;
 981                 u32 namelen;
 982                 u32 filelen;
 983                 u32 pageslen;
 984                 u32 attrs;
 985                 u32 siglen;
 986         } inbuf;
 987         u32 sc;
 988 
 989         args = kcalloc(FASTRPC_CREATE_PROCESS_NARGS, sizeof(*args), GFP_KERNEL);
 990         if (!args)
 991                 return -ENOMEM;
 992 
 993         if (copy_from_user(&init, argp, sizeof(init))) {
 994                 err = -EFAULT;
 995                 goto err;
 996         }
 997 
 998         if (init.filelen > INIT_FILELEN_MAX) {
 999                 err = -EINVAL;
1000                 goto err;
1001         }
1002 
1003         inbuf.pgid = fl->tgid;
1004         inbuf.namelen = strlen(current->comm) + 1;
1005         inbuf.filelen = init.filelen;
1006         inbuf.pageslen = 1;
1007         inbuf.attrs = init.attrs;
1008         inbuf.siglen = init.siglen;
1009         fl->pd = 1;
1010 
1011         if (init.filelen && init.filefd) {
1012                 err = fastrpc_map_create(fl, init.filefd, init.filelen, &map);
1013                 if (err)
1014                         goto err;
1015         }
1016 
1017         memlen = ALIGN(max(INIT_FILELEN_MAX, (int)init.filelen * 4),
1018                        1024 * 1024);
1019         err = fastrpc_buf_alloc(fl, fl->sctx->dev, memlen,
1020                                 &imem);
1021         if (err)
1022                 goto err_alloc;
1023 
1024         fl->init_mem = imem;
1025         args[0].ptr = (u64)(uintptr_t)&inbuf;
1026         args[0].length = sizeof(inbuf);
1027         args[0].fd = -1;
1028 
1029         args[1].ptr = (u64)(uintptr_t)current->comm;
1030         args[1].length = inbuf.namelen;
1031         args[1].fd = -1;
1032 
1033         args[2].ptr = (u64) init.file;
1034         args[2].length = inbuf.filelen;
1035         args[2].fd = init.filefd;
1036 
1037         pages[0].addr = imem->phys;
1038         pages[0].size = imem->size;
1039 
1040         args[3].ptr = (u64)(uintptr_t) pages;
1041         args[3].length = 1 * sizeof(*pages);
1042         args[3].fd = -1;
1043 
1044         args[4].ptr = (u64)(uintptr_t)&inbuf.attrs;
1045         args[4].length = sizeof(inbuf.attrs);
1046         args[4].fd = -1;
1047 
1048         args[5].ptr = (u64)(uintptr_t) &inbuf.siglen;
1049         args[5].length = sizeof(inbuf.siglen);
1050         args[5].fd = -1;
1051 
1052         sc = FASTRPC_SCALARS(FASTRPC_RMID_INIT_CREATE, 4, 0);
1053         if (init.attrs)
1054                 sc = FASTRPC_SCALARS(FASTRPC_RMID_INIT_CREATE_ATTR, 6, 0);
1055 
1056         err = fastrpc_internal_invoke(fl, true, FASTRPC_INIT_HANDLE,
1057                                       sc, args);
1058         if (err)
1059                 goto err_invoke;
1060 
1061         kfree(args);
1062 
1063         return 0;
1064 
1065 err_invoke:
1066         fl->init_mem = NULL;
1067         fastrpc_buf_free(imem);
1068 err_alloc:
1069         if (map) {
1070                 spin_lock(&fl->lock);
1071                 list_del(&map->node);
1072                 spin_unlock(&fl->lock);
1073                 fastrpc_map_put(map);
1074         }
1075 err:
1076         kfree(args);
1077 
1078         return err;
1079 }
1080 
1081 static struct fastrpc_session_ctx *fastrpc_session_alloc(
1082                                         struct fastrpc_channel_ctx *cctx)
1083 {
1084         struct fastrpc_session_ctx *session = NULL;
1085         unsigned long flags;
1086         int i;
1087 
1088         spin_lock_irqsave(&cctx->lock, flags);
1089         for (i = 0; i < cctx->sesscount; i++) {
1090                 if (!cctx->session[i].used && cctx->session[i].valid) {
1091                         cctx->session[i].used = true;
1092                         session = &cctx->session[i];
1093                         break;
1094                 }
1095         }
1096         spin_unlock_irqrestore(&cctx->lock, flags);
1097 
1098         return session;
1099 }
1100 
1101 static void fastrpc_session_free(struct fastrpc_channel_ctx *cctx,
1102                                  struct fastrpc_session_ctx *session)
1103 {
1104         unsigned long flags;
1105 
1106         spin_lock_irqsave(&cctx->lock, flags);
1107         session->used = false;
1108         spin_unlock_irqrestore(&cctx->lock, flags);
1109 }
1110 
1111 static int fastrpc_release_current_dsp_process(struct fastrpc_user *fl)
1112 {
1113         struct fastrpc_invoke_args args[1];
1114         int tgid = 0;
1115         u32 sc;
1116 
1117         tgid = fl->tgid;
1118         args[0].ptr = (u64)(uintptr_t) &tgid;
1119         args[0].length = sizeof(tgid);
1120         args[0].fd = -1;
1121         args[0].reserved = 0;
1122         sc = FASTRPC_SCALARS(FASTRPC_RMID_INIT_RELEASE, 1, 0);
1123 
1124         return fastrpc_internal_invoke(fl, true, FASTRPC_INIT_HANDLE,
1125                                        sc, &args[0]);
1126 }
1127 
1128 static int fastrpc_device_release(struct inode *inode, struct file *file)
1129 {
1130         struct fastrpc_user *fl = (struct fastrpc_user *)file->private_data;
1131         struct fastrpc_channel_ctx *cctx = fl->cctx;
1132         struct fastrpc_invoke_ctx *ctx, *n;
1133         struct fastrpc_map *map, *m;
1134         unsigned long flags;
1135 
1136         fastrpc_release_current_dsp_process(fl);
1137 
1138         spin_lock_irqsave(&cctx->lock, flags);
1139         list_del(&fl->user);
1140         spin_unlock_irqrestore(&cctx->lock, flags);
1141 
1142         if (fl->init_mem)
1143                 fastrpc_buf_free(fl->init_mem);
1144 
1145         list_for_each_entry_safe(ctx, n, &fl->pending, node) {
1146                 list_del(&ctx->node);
1147                 fastrpc_context_put(ctx);
1148         }
1149 
1150         list_for_each_entry_safe(map, m, &fl->maps, node) {
1151                 list_del(&map->node);
1152                 fastrpc_map_put(map);
1153         }
1154 
1155         fastrpc_session_free(cctx, fl->sctx);
1156         fastrpc_channel_ctx_put(cctx);
1157 
1158         mutex_destroy(&fl->mutex);
1159         kfree(fl);
1160         file->private_data = NULL;
1161 
1162         return 0;
1163 }
1164 
1165 static int fastrpc_device_open(struct inode *inode, struct file *filp)
1166 {
1167         struct fastrpc_channel_ctx *cctx = miscdev_to_cctx(filp->private_data);
1168         struct fastrpc_user *fl = NULL;
1169         unsigned long flags;
1170 
1171         fl = kzalloc(sizeof(*fl), GFP_KERNEL);
1172         if (!fl)
1173                 return -ENOMEM;
1174 
1175         /* Released in fastrpc_device_release() */
1176         fastrpc_channel_ctx_get(cctx);
1177 
1178         filp->private_data = fl;
1179         spin_lock_init(&fl->lock);
1180         mutex_init(&fl->mutex);
1181         INIT_LIST_HEAD(&fl->pending);
1182         INIT_LIST_HEAD(&fl->maps);
1183         INIT_LIST_HEAD(&fl->user);
1184         fl->tgid = current->tgid;
1185         fl->cctx = cctx;
1186 
1187         fl->sctx = fastrpc_session_alloc(cctx);
1188         if (!fl->sctx) {
1189                 dev_err(&cctx->rpdev->dev, "No session available\n");
1190                 mutex_destroy(&fl->mutex);
1191                 kfree(fl);
1192 
1193                 return -EBUSY;
1194         }
1195 
1196         spin_lock_irqsave(&cctx->lock, flags);
1197         list_add_tail(&fl->user, &cctx->users);
1198         spin_unlock_irqrestore(&cctx->lock, flags);
1199 
1200         return 0;
1201 }
1202 
1203 static int fastrpc_dmabuf_alloc(struct fastrpc_user *fl, char __user *argp)
1204 {
1205         struct fastrpc_alloc_dma_buf bp;
1206         DEFINE_DMA_BUF_EXPORT_INFO(exp_info);
1207         struct fastrpc_buf *buf = NULL;
1208         int err;
1209 
1210         if (copy_from_user(&bp, argp, sizeof(bp)))
1211                 return -EFAULT;
1212 
1213         err = fastrpc_buf_alloc(fl, fl->sctx->dev, bp.size, &buf);
1214         if (err)
1215                 return err;
1216         exp_info.ops = &fastrpc_dma_buf_ops;
1217         exp_info.size = bp.size;
1218         exp_info.flags = O_RDWR;
1219         exp_info.priv = buf;
1220         buf->dmabuf = dma_buf_export(&exp_info);
1221         if (IS_ERR(buf->dmabuf)) {
1222                 err = PTR_ERR(buf->dmabuf);
1223                 fastrpc_buf_free(buf);
1224                 return err;
1225         }
1226 
1227         bp.fd = dma_buf_fd(buf->dmabuf, O_ACCMODE);
1228         if (bp.fd < 0) {
1229                 dma_buf_put(buf->dmabuf);
1230                 return -EINVAL;
1231         }
1232 
1233         if (copy_to_user(argp, &bp, sizeof(bp))) {
1234                 dma_buf_put(buf->dmabuf);
1235                 return -EFAULT;
1236         }
1237 
1238         return 0;
1239 }
1240 
1241 static int fastrpc_init_attach(struct fastrpc_user *fl)
1242 {
1243         struct fastrpc_invoke_args args[1];
1244         int tgid = fl->tgid;
1245         u32 sc;
1246 
1247         args[0].ptr = (u64)(uintptr_t) &tgid;
1248         args[0].length = sizeof(tgid);
1249         args[0].fd = -1;
1250         args[0].reserved = 0;
1251         sc = FASTRPC_SCALARS(FASTRPC_RMID_INIT_ATTACH, 1, 0);
1252         fl->pd = 0;
1253 
1254         return fastrpc_internal_invoke(fl, true, FASTRPC_INIT_HANDLE,
1255                                        sc, &args[0]);
1256 }
1257 
1258 static int fastrpc_invoke(struct fastrpc_user *fl, char __user *argp)
1259 {
1260         struct fastrpc_invoke_args *args = NULL;
1261         struct fastrpc_invoke inv;
1262         u32 nscalars;
1263         int err;
1264 
1265         if (copy_from_user(&inv, argp, sizeof(inv)))
1266                 return -EFAULT;
1267 
1268         /* nscalars is truncated here to max supported value */
1269         nscalars = REMOTE_SCALARS_LENGTH(inv.sc);
1270         if (nscalars) {
1271                 args = kcalloc(nscalars, sizeof(*args), GFP_KERNEL);
1272                 if (!args)
1273                         return -ENOMEM;
1274 
1275                 if (copy_from_user(args, (void __user *)(uintptr_t)inv.args,
1276                                    nscalars * sizeof(*args))) {
1277                         kfree(args);
1278                         return -EFAULT;
1279                 }
1280         }
1281 
1282         err = fastrpc_internal_invoke(fl, false, inv.handle, inv.sc, args);
1283         kfree(args);
1284 
1285         return err;
1286 }
1287 
1288 static long fastrpc_device_ioctl(struct file *file, unsigned int cmd,
1289                                  unsigned long arg)
1290 {
1291         struct fastrpc_user *fl = (struct fastrpc_user *)file->private_data;
1292         char __user *argp = (char __user *)arg;
1293         int err;
1294 
1295         switch (cmd) {
1296         case FASTRPC_IOCTL_INVOKE:
1297                 err = fastrpc_invoke(fl, argp);
1298                 break;
1299         case FASTRPC_IOCTL_INIT_ATTACH:
1300                 err = fastrpc_init_attach(fl);
1301                 break;
1302         case FASTRPC_IOCTL_INIT_CREATE:
1303                 err = fastrpc_init_create_process(fl, argp);
1304                 break;
1305         case FASTRPC_IOCTL_ALLOC_DMA_BUFF:
1306                 err = fastrpc_dmabuf_alloc(fl, argp);
1307                 break;
1308         default:
1309                 err = -ENOTTY;
1310                 break;
1311         }
1312 
1313         return err;
1314 }
1315 
1316 static const struct file_operations fastrpc_fops = {
1317         .open = fastrpc_device_open,
1318         .release = fastrpc_device_release,
1319         .unlocked_ioctl = fastrpc_device_ioctl,
1320         .compat_ioctl = fastrpc_device_ioctl,
1321 };
1322 
1323 static int fastrpc_cb_probe(struct platform_device *pdev)
1324 {
1325         struct fastrpc_channel_ctx *cctx;
1326         struct fastrpc_session_ctx *sess;
1327         struct device *dev = &pdev->dev;
1328         int i, sessions = 0;
1329         unsigned long flags;
1330         int rc;
1331 
1332         cctx = dev_get_drvdata(dev->parent);
1333         if (!cctx)
1334                 return -EINVAL;
1335 
1336         of_property_read_u32(dev->of_node, "qcom,nsessions", &sessions);
1337 
1338         spin_lock_irqsave(&cctx->lock, flags);
1339         sess = &cctx->session[cctx->sesscount];
1340         sess->used = false;
1341         sess->valid = true;
1342         sess->dev = dev;
1343         dev_set_drvdata(dev, sess);
1344 
1345         if (of_property_read_u32(dev->of_node, "reg", &sess->sid))
1346                 dev_info(dev, "FastRPC Session ID not specified in DT\n");
1347 
1348         if (sessions > 0) {
1349                 struct fastrpc_session_ctx *dup_sess;
1350 
1351                 for (i = 1; i < sessions; i++) {
1352                         if (cctx->sesscount++ >= FASTRPC_MAX_SESSIONS)
1353                                 break;
1354                         dup_sess = &cctx->session[cctx->sesscount];
1355                         memcpy(dup_sess, sess, sizeof(*dup_sess));
1356                 }
1357         }
1358         cctx->sesscount++;
1359         spin_unlock_irqrestore(&cctx->lock, flags);
1360         rc = dma_set_mask(dev, DMA_BIT_MASK(32));
1361         if (rc) {
1362                 dev_err(dev, "32-bit DMA enable failed\n");
1363                 return rc;
1364         }
1365 
1366         return 0;
1367 }
1368 
1369 static int fastrpc_cb_remove(struct platform_device *pdev)
1370 {
1371         struct fastrpc_channel_ctx *cctx = dev_get_drvdata(pdev->dev.parent);
1372         struct fastrpc_session_ctx *sess = dev_get_drvdata(&pdev->dev);
1373         unsigned long flags;
1374         int i;
1375 
1376         spin_lock_irqsave(&cctx->lock, flags);
1377         for (i = 1; i < FASTRPC_MAX_SESSIONS; i++) {
1378                 if (cctx->session[i].sid == sess->sid) {
1379                         cctx->session[i].valid = false;
1380                         cctx->sesscount--;
1381                 }
1382         }
1383         spin_unlock_irqrestore(&cctx->lock, flags);
1384 
1385         return 0;
1386 }
1387 
1388 static const struct of_device_id fastrpc_match_table[] = {
1389         { .compatible = "qcom,fastrpc-compute-cb", },
1390         {}
1391 };
1392 
1393 static struct platform_driver fastrpc_cb_driver = {
1394         .probe = fastrpc_cb_probe,
1395         .remove = fastrpc_cb_remove,
1396         .driver = {
1397                 .name = "qcom,fastrpc-cb",
1398                 .of_match_table = fastrpc_match_table,
1399                 .suppress_bind_attrs = true,
1400         },
1401 };
1402 
1403 static int fastrpc_rpmsg_probe(struct rpmsg_device *rpdev)
1404 {
1405         struct device *rdev = &rpdev->dev;
1406         struct fastrpc_channel_ctx *data;
1407         int i, err, domain_id = -1;
1408         const char *domain;
1409 
1410         err = of_property_read_string(rdev->of_node, "label", &domain);
1411         if (err) {
1412                 dev_info(rdev, "FastRPC Domain not specified in DT\n");
1413                 return err;
1414         }
1415 
1416         for (i = 0; i <= CDSP_DOMAIN_ID; i++) {
1417                 if (!strcmp(domains[i], domain)) {
1418                         domain_id = i;
1419                         break;
1420                 }
1421         }
1422 
1423         if (domain_id < 0) {
1424                 dev_info(rdev, "FastRPC Invalid Domain ID %d\n", domain_id);
1425                 return -EINVAL;
1426         }
1427 
1428         data = kzalloc(sizeof(*data), GFP_KERNEL);
1429         if (!data)
1430                 return -ENOMEM;
1431 
1432         data->miscdev.minor = MISC_DYNAMIC_MINOR;
1433         data->miscdev.name = devm_kasprintf(rdev, GFP_KERNEL, "fastrpc-%s",
1434                                             domains[domain_id]);
1435         data->miscdev.fops = &fastrpc_fops;
1436         err = misc_register(&data->miscdev);
1437         if (err)
1438                 return err;
1439 
1440         kref_init(&data->refcount);
1441 
1442         dev_set_drvdata(&rpdev->dev, data);
1443         dma_set_mask_and_coherent(rdev, DMA_BIT_MASK(32));
1444         INIT_LIST_HEAD(&data->users);
1445         spin_lock_init(&data->lock);
1446         idr_init(&data->ctx_idr);
1447         data->domain_id = domain_id;
1448         data->rpdev = rpdev;
1449 
1450         return of_platform_populate(rdev->of_node, NULL, NULL, rdev);
1451 }
1452 
1453 static void fastrpc_notify_users(struct fastrpc_user *user)
1454 {
1455         struct fastrpc_invoke_ctx *ctx;
1456 
1457         spin_lock(&user->lock);
1458         list_for_each_entry(ctx, &user->pending, node)
1459                 complete(&ctx->work);
1460         spin_unlock(&user->lock);
1461 }
1462 
1463 static void fastrpc_rpmsg_remove(struct rpmsg_device *rpdev)
1464 {
1465         struct fastrpc_channel_ctx *cctx = dev_get_drvdata(&rpdev->dev);
1466         struct fastrpc_user *user;
1467         unsigned long flags;
1468 
1469         spin_lock_irqsave(&cctx->lock, flags);
1470         list_for_each_entry(user, &cctx->users, user)
1471                 fastrpc_notify_users(user);
1472         spin_unlock_irqrestore(&cctx->lock, flags);
1473 
1474         misc_deregister(&cctx->miscdev);
1475         of_platform_depopulate(&rpdev->dev);
1476 
1477         cctx->rpdev = NULL;
1478         fastrpc_channel_ctx_put(cctx);
1479 }
1480 
1481 static int fastrpc_rpmsg_callback(struct rpmsg_device *rpdev, void *data,
1482                                   int len, void *priv, u32 addr)
1483 {
1484         struct fastrpc_channel_ctx *cctx = dev_get_drvdata(&rpdev->dev);
1485         struct fastrpc_invoke_rsp *rsp = data;
1486         struct fastrpc_invoke_ctx *ctx;
1487         unsigned long flags;
1488         unsigned long ctxid;
1489 
1490         if (len < sizeof(*rsp))
1491                 return -EINVAL;
1492 
1493         ctxid = ((rsp->ctx & FASTRPC_CTXID_MASK) >> 4);
1494 
1495         spin_lock_irqsave(&cctx->lock, flags);
1496         ctx = idr_find(&cctx->ctx_idr, ctxid);
1497         spin_unlock_irqrestore(&cctx->lock, flags);
1498 
1499         if (!ctx) {
1500                 dev_err(&rpdev->dev, "No context ID matches response\n");
1501                 return -ENOENT;
1502         }
1503 
1504         ctx->retval = rsp->retval;
1505         complete(&ctx->work);
1506 
1507         /*
1508          * The DMA buffer associated with the context cannot be freed in
1509          * interrupt context so schedule it through a worker thread to
1510          * avoid a kernel BUG.
1511          */
1512         schedule_work(&ctx->put_work);
1513 
1514         return 0;
1515 }
1516 
1517 static const struct of_device_id fastrpc_rpmsg_of_match[] = {
1518         { .compatible = "qcom,fastrpc" },
1519         { },
1520 };
1521 MODULE_DEVICE_TABLE(of, fastrpc_rpmsg_of_match);
1522 
1523 static struct rpmsg_driver fastrpc_driver = {
1524         .probe = fastrpc_rpmsg_probe,
1525         .remove = fastrpc_rpmsg_remove,
1526         .callback = fastrpc_rpmsg_callback,
1527         .drv = {
1528                 .name = "qcom,fastrpc",
1529                 .of_match_table = fastrpc_rpmsg_of_match,
1530         },
1531 };
1532 
1533 static int fastrpc_init(void)
1534 {
1535         int ret;
1536 
1537         ret = platform_driver_register(&fastrpc_cb_driver);
1538         if (ret < 0) {
1539                 pr_err("fastrpc: failed to register cb driver\n");
1540                 return ret;
1541         }
1542 
1543         ret = register_rpmsg_driver(&fastrpc_driver);
1544         if (ret < 0) {
1545                 pr_err("fastrpc: failed to register rpmsg driver\n");
1546                 platform_driver_unregister(&fastrpc_cb_driver);
1547                 return ret;
1548         }
1549 
1550         return 0;
1551 }
1552 module_init(fastrpc_init);
1553 
1554 static void fastrpc_exit(void)
1555 {
1556         platform_driver_unregister(&fastrpc_cb_driver);
1557         unregister_rpmsg_driver(&fastrpc_driver);
1558 }
1559 module_exit(fastrpc_exit);
1560 
1561 MODULE_LICENSE("GPL v2");

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