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 13 /*12 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_DSP_UTILITIES_HANDLE 2 35 #define FASTRPC_CTXID_MASK (0xFF0) 36 #define INIT_FILELEN_MAX (2 * 1024 * 1024) 37 #define FASTRPC_DEVICE_NAME "fastrpc" 38 #define ADSP_MMAP_ADD_PAGES 0x1000 39 #define DSP_UNSUPPORTED_API (0x80000414) 40 /* MAX NUMBER of DSP ATTRIBUTES SUPPORTED */ 41 #define FASTRPC_MAX_DSP_ATTRIBUTES (256) 42 #define FASTRPC_MAX_DSP_ATTRIBUTES_LEN (sizeof(u32) * FASTRPC_MAX_DSP_ATTRIBUTES) 43 44 /* Retrives number of input buffers from the scalars parameter */ 45 #define REMOTE_SCALARS_INBUFS(sc) (((sc) >> 16) & 0x0ff) 46 47 /* Retrives number of output buffers from the scalars parameter */ 48 #define REMOTE_SCALARS_OUTBUFS(sc) (((sc) >> 8) & 0x0ff) 49 50 /* Retrives number of input handles from the scalars parameter */ 51 #define REMOTE_SCALARS_INHANDLES(sc) (((sc) >> 4) & 0x0f) 52 53 /* Retrives number of output handles from the scalars parameter */ 54 #define REMOTE_SCALARS_OUTHANDLES(sc) ((sc) & 0x0f) 55 56 #define REMOTE_SCALARS_LENGTH(sc) (REMOTE_SCALARS_INBUFS(sc) + \ 57 REMOTE_SCALARS_OUTBUFS(sc) + \ 58 REMOTE_SCALARS_INHANDLES(sc)+ \ 59 REMOTE_SCALARS_OUTHANDLES(sc)) 60 #define FASTRPC_BUILD_SCALARS(attr, method, in, out, oin, oout) \ 61 (((attr & 0x07) << 29) | \ 62 ((method & 0x1f) << 24) | \ 63 ((in & 0xff) << 16) | \ 64 ((out & 0xff) << 8) | \ 65 ((oin & 0x0f) << 4) | \ 66 (oout & 0x0f)) 67 68 #define FASTRPC_SCALARS(method, in, out) \ 69 FASTRPC_BUILD_SCALARS(0, method, in, out, 0, 0) 70 71 #define FASTRPC_CREATE_PROCESS_NARGS 6 72 /* Remote Method id table */ 73 #define FASTRPC_RMID_INIT_ATTACH 0 74 #define FASTRPC_RMID_INIT_RELEASE 1 75 #define FASTRPC_RMID_INIT_MMAP 4 76 #define FASTRPC_RMID_INIT_MUNMAP 5 77 #define FASTRPC_RMID_INIT_CREATE 6 78 #define FASTRPC_RMID_INIT_CREATE_ATTR 7 79 #define FASTRPC_RMID_INIT_CREATE_STATIC 8 80 #define FASTRPC_RMID_INIT_MEM_MAP 10 81 #define FASTRPC_RMID_INIT_MEM_UNMAP 11 82 83 /* Protection Domain(PD) ids */ 84 #define AUDIO_PD (0) /* also GUEST_OS PD? */ 85 #define USER_PD (1) 86 #define SENSORS_PD (2) 87 88 #define miscdev_to_fdevice(d) container_of(d, struct fastrpc_device, miscdev) 89 90 static const char *domains[FASTRPC_DEV_MAX] = { "adsp", "mdsp", 91 "sdsp", "cdsp"}; 92 struct fastrpc_phy_page { 93 u64 addr; /* physical address */ 94 u64 size; /* size of contiguous region */ 95 }; 96 97 struct fastrpc_invoke_buf { 98 u32 num; /* number of contiguous regions */ 99 u32 pgidx; /* index to start of contiguous region */ 100 }; 101 102 struct fastrpc_remote_arg { 103 u64 pv; 104 u64 len; 105 }; 106 107 struct fastrpc_mmap_rsp_msg { 108 u64 vaddr; 109 }; 110 111 struct fastrpc_mmap_req_msg { 112 s32 pgid; 113 u32 flags; 114 u64 vaddr; 115 s32 num; 116 }; 117 118 struct fastrpc_mem_map_req_msg { 119 s32 pgid; 120 s32 fd; 121 s32 offset; 122 u32 flags; 123 u64 vaddrin; 124 s32 num; 125 s32 data_len; 126 }; 127 128 struct fastrpc_munmap_req_msg { 129 s32 pgid; 130 u64 vaddr; 131 u64 size; 132 }; 133 134 struct fastrpc_mem_unmap_req_msg { 135 s32 pgid; 136 s32 fd; 137 u64 vaddrin; 138 u64 len; 139 }; 140 141 struct fastrpc_msg { 142 int pid; /* process group id */ 143 int tid; /* thread id */ 144 u64 ctx; /* invoke caller context */ 145 u32 handle; /* handle to invoke */ 146 u32 sc; /* scalars structure describing the data */ 147 u64 addr; /* physical address */ 148 u64 size; /* size of contiguous region */ 149 }; 150 151 struct fastrpc_invoke_rsp { 152 u64 ctx; /* invoke caller context */ 153 int retval; /* invoke return value */ 154 }; 155 156 struct fastrpc_buf_overlap { 157 u64 start; 158 u64 end; 159 int raix; 160 u64 mstart; 161 u64 mend; 162 u64 offset; 163 }; 164 165 struct fastrpc_buf { 166 struct fastrpc_user *fl; 167 struct dma_buf *dmabuf; 168 struct device *dev; 169 void *virt; 170 u64 phys; 171 u64 size; 172 /* Lock for dma buf attachments */ 173 struct mutex lock; 174 struct list_head attachments; 175 /* mmap support */ 176 struct list_head node; /* list of user requested mmaps */ 177 uintptr_t raddr; 178 }; 179 180 struct fastrpc_dma_buf_attachment { 181 struct device *dev; 182 struct sg_table sgt; 183 struct list_head node; 184 }; 185 186 struct fastrpc_map { 187 struct list_head node; 188 struct fastrpc_user *fl; 189 int fd; 190 struct dma_buf *buf; 191 struct sg_table *table; 192 struct dma_buf_attachment *attach; 193 u64 phys; 194 u64 size; 195 void *va; 196 u64 len; 197 u64 raddr; 198 struct kref refcount; 199 }; 200 201 struct fastrpc_invoke_ctx { 202 int nscalars; 203 int nbufs; 204 int retval; 205 int pid; 206 int tgid; 207 u32 sc; 208 u32 *crc; 209 u64 ctxid; 210 u64 msg_sz; 211 struct kref refcount; 212 struct list_head node; /* list of ctxs */ 213 struct completion work; 214 struct work_struct put_work; 215 struct fastrpc_msg msg; 216 struct fastrpc_user *fl; 217 struct fastrpc_remote_arg *rpra; 218 struct fastrpc_map **maps; 219 struct fastrpc_buf *buf; 220 struct fastrpc_invoke_args *args; 221 struct fastrpc_buf_overlap *olaps; 222 struct fastrpc_channel_ctx *cctx; 223 }; 224 225 struct fastrpc_session_ctx { 226 struct device *dev; 227 int sid; 228 bool used; 229 bool valid; 230 }; 231 232 struct fastrpc_channel_ctx { 233 int domain_id; 234 int sesscount; 235 struct rpmsg_device *rpdev; 236 struct fastrpc_session_ctx session[FASTRPC_MAX_SESSIONS]; 237 spinlock_t lock; 238 struct idr ctx_idr; 239 struct list_head users; 240 struct kref refcount; 241 /* Flag if dsp attributes are cached */ 242 bool valid_attributes; 243 u32 dsp_attributes[FASTRPC_MAX_DSP_ATTRIBUTES]; 244 struct fastrpc_device *secure_fdevice; 245 struct fastrpc_device *fdevice; 246 bool secure; 247 }; 248 249 struct fastrpc_device { 250 struct fastrpc_channel_ctx *cctx; 251 struct miscdevice miscdev; 252 bool secure; 253 }; 254 255 struct fastrpc_user { 256 struct list_head user; 257 struct list_head maps; 258 struct list_head pending; 259 struct list_head mmaps; 260 261 struct fastrpc_channel_ctx *cctx; 262 struct fastrpc_session_ctx *sctx; 263 struct fastrpc_buf *init_mem; 264 265 int tgid; 266 int pd; 267 /* Lock for lists */ 268 spinlock_t lock; 269 /* lock for allocations */ 270 struct mutex mutex; 271 }; 272 273 static void fastrpc_free_map(struct kref *ref) 274 { 275 struct fastrpc_map *map; 276 277 map = container_of(ref, struct fastrpc_map, refcount); 278 279 if (map->table) { 280 dma_buf_unmap_attachment(map->attach, map->table, 281 DMA_BIDIRECTIONAL); 282 dma_buf_detach(map->buf, map->attach); 283 dma_buf_put(map->buf); 284 } 285 286 kfree(map); 287 } 288 289 static void fastrpc_map_put(struct fastrpc_map *map) 290 { 291 if (map) 292 kref_put(&map->refcount, fastrpc_free_map); 293 } 294 295 static void fastrpc_map_get(struct fastrpc_map *map) 296 { 297 if (map) 298 kref_get(&map->refcount); 299 } 300 301 static int fastrpc_map_find(struct fastrpc_user *fl, int fd, 302 struct fastrpc_map **ppmap) 303 { 304 struct fastrpc_map *map = NULL; 305 306 mutex_lock(&fl->mutex); 307 list_for_each_entry(map, &fl->maps, node) { 308 if (map->fd == fd) { 309 fastrpc_map_get(map); 310 *ppmap = map; 311 mutex_unlock(&fl->mutex); 312 return 0; 313 } 314 } 315 mutex_unlock(&fl->mutex); 316 317 return -ENOENT; 318 } 319 320 static void fastrpc_buf_free(struct fastrpc_buf *buf) 321 { 322 dma_free_coherent(buf->dev, buf->size, buf->virt, 323 FASTRPC_PHYS(buf->phys)); 324 kfree(buf); 325 } 326 327 static int fastrpc_buf_alloc(struct fastrpc_user *fl, struct device *dev, 328 u64 size, struct fastrpc_buf **obuf) 329 { 330 struct fastrpc_buf *buf; 331 332 buf = kzalloc(sizeof(*buf), GFP_KERNEL); 333 if (!buf) 334 return -ENOMEM; 335 336 INIT_LIST_HEAD(&buf->attachments); 337 INIT_LIST_HEAD(&buf->node); 338 mutex_init(&buf->lock); 339 340 buf->fl = fl; 341 buf->virt = NULL; 342 buf->phys = 0; 343 buf->size = size; 344 buf->dev = dev; 345 buf->raddr = 0; 346 347 buf->virt = dma_alloc_coherent(dev, buf->size, (dma_addr_t *)&buf->phys, 348 GFP_KERNEL); 349 if (!buf->virt) { 350 mutex_destroy(&buf->lock); 351 kfree(buf); 352 return -ENOMEM; 353 } 354 355 if (fl->sctx && fl->sctx->sid) 356 buf->phys += ((u64)fl->sctx->sid << 32); 357 358 *obuf = buf; 359 360 return 0; 361 } 362 363 static void fastrpc_channel_ctx_free(struct kref *ref) 364 { 365 struct fastrpc_channel_ctx *cctx; 366 367 cctx = container_of(ref, struct fastrpc_channel_ctx, refcount); 368 369 kfree(cctx); 370 } 371 372 static void fastrpc_channel_ctx_get(struct fastrpc_channel_ctx *cctx) 373 { 374 kref_get(&cctx->refcount); 375 } 376 377 static void fastrpc_channel_ctx_put(struct fastrpc_channel_ctx *cctx) 378 { 379 kref_put(&cctx->refcount, fastrpc_channel_ctx_free); 380 } 381 382 static void fastrpc_context_free(struct kref *ref) 383 { 384 struct fastrpc_invoke_ctx *ctx; 385 struct fastrpc_channel_ctx *cctx; 386 unsigned long flags; 387 int i; 388 389 ctx = container_of(ref, struct fastrpc_invoke_ctx, refcount); 390 cctx = ctx->cctx; 391 392 for (i = 0; i < ctx->nscalars; i++) 393 fastrpc_map_put(ctx->maps[i]); 394 395 if (ctx->buf) 396 fastrpc_buf_free(ctx->buf); 397 398 spin_lock_irqsave(&cctx->lock, flags); 399 idr_remove(&cctx->ctx_idr, ctx->ctxid >> 4); 400 spin_unlock_irqrestore(&cctx->lock, flags); 401 402 kfree(ctx->maps); 403 kfree(ctx->olaps); 404 kfree(ctx); 405 406 fastrpc_channel_ctx_put(cctx); 407 } 408 409 static void fastrpc_context_get(struct fastrpc_invoke_ctx *ctx) 410 { 411 kref_get(&ctx->refcount); 412 } 413 414 static void fastrpc_context_put(struct fastrpc_invoke_ctx *ctx) 415 { 416 kref_put(&ctx->refcount, fastrpc_context_free); 417 } 418 419 static void fastrpc_context_put_wq(struct work_struct *work) 420 { 421 struct fastrpc_invoke_ctx *ctx = 422 container_of(work, struct fastrpc_invoke_ctx, put_work); 423 424 fastrpc_context_put(ctx); 425 } 426 427 #define CMP(aa, bb) ((aa) == (bb) ? 0 : (aa) < (bb) ? -1 : 1) 428 static int olaps_cmp(const void *a, const void *b) 429 { 430 struct fastrpc_buf_overlap *pa = (struct fastrpc_buf_overlap *)a; 431 struct fastrpc_buf_overlap *pb = (struct fastrpc_buf_overlap *)b; 432 /* sort with lowest starting buffer first */ 433 int st = CMP(pa->start, pb->start); 434 /* sort with highest ending buffer first */ 435 int ed = CMP(pb->end, pa->end); 436 437 return st == 0 ? ed : st; 438 } 439 440 static void fastrpc_get_buff_overlaps(struct fastrpc_invoke_ctx *ctx) 441 { 442 u64 max_end = 0; 443 int i; 444 445 for (i = 0; i < ctx->nbufs; ++i) { 446 ctx->olaps[i].start = ctx->args[i].ptr; 447 ctx->olaps[i].end = ctx->olaps[i].start + ctx->args[i].length; 448 ctx->olaps[i].raix = i; 449 } 450 451 sort(ctx->olaps, ctx->nbufs, sizeof(*ctx->olaps), olaps_cmp, NULL); 452 453 for (i = 0; i < ctx->nbufs; ++i) { 454 /* Falling inside previous range */ 455 if (ctx->olaps[i].start < max_end) { 456 ctx->olaps[i].mstart = max_end; 457 ctx->olaps[i].mend = ctx->olaps[i].end; 458 ctx->olaps[i].offset = max_end - ctx->olaps[i].start; 459 460 if (ctx->olaps[i].end > max_end) { 461 max_end = ctx->olaps[i].end; 462 } else { 463 ctx->olaps[i].mend = 0; 464 ctx->olaps[i].mstart = 0; 465 } 466 467 } else { 468 ctx->olaps[i].mend = ctx->olaps[i].end; 469 ctx->olaps[i].mstart = ctx->olaps[i].start; 470 ctx->olaps[i].offset = 0; 471 max_end = ctx->olaps[i].end; 472 } 473 } 474 } 475 476 static struct fastrpc_invoke_ctx *fastrpc_context_alloc( 477 struct fastrpc_user *user, u32 kernel, u32 sc, 478 struct fastrpc_invoke_args *args) 479 { 480 struct fastrpc_channel_ctx *cctx = user->cctx; 481 struct fastrpc_invoke_ctx *ctx = NULL; 482 unsigned long flags; 483 int ret; 484 485 ctx = kzalloc(sizeof(*ctx), GFP_KERNEL); 486 if (!ctx) 487 return ERR_PTR(-ENOMEM); 488 489 INIT_LIST_HEAD(&ctx->node); 490 ctx->fl = user; 491 ctx->nscalars = REMOTE_SCALARS_LENGTH(sc); 492 ctx->nbufs = REMOTE_SCALARS_INBUFS(sc) + 493 REMOTE_SCALARS_OUTBUFS(sc); 494 495 if (ctx->nscalars) { 496 ctx->maps = kcalloc(ctx->nscalars, 497 sizeof(*ctx->maps), GFP_KERNEL); 498 if (!ctx->maps) { 499 kfree(ctx); 500 return ERR_PTR(-ENOMEM); 501 } 502 ctx->olaps = kcalloc(ctx->nscalars, 503 sizeof(*ctx->olaps), GFP_KERNEL); 504 if (!ctx->olaps) { 505 kfree(ctx->maps); 506 kfree(ctx); 507 return ERR_PTR(-ENOMEM); 508 } 509 ctx->args = args; 510 fastrpc_get_buff_overlaps(ctx); 511 } 512 513 /* Released in fastrpc_context_put() */ 514 fastrpc_channel_ctx_get(cctx); 515 516 ctx->sc = sc; 517 ctx->retval = -1; 518 ctx->pid = current->pid; 519 ctx->tgid = user->tgid; 520 ctx->cctx = cctx; 521 init_completion(&ctx->work); 522 INIT_WORK(&ctx->put_work, fastrpc_context_put_wq); 523 524 spin_lock(&user->lock); 525 list_add_tail(&ctx->node, &user->pending); 526 spin_unlock(&user->lock); 527 528 spin_lock_irqsave(&cctx->lock, flags); 529 ret = idr_alloc_cyclic(&cctx->ctx_idr, ctx, 1, 530 FASTRPC_CTX_MAX, GFP_ATOMIC); 531 if (ret < 0) { 532 spin_unlock_irqrestore(&cctx->lock, flags); 533 goto err_idr; 534 } 535 ctx->ctxid = ret << 4; 536 spin_unlock_irqrestore(&cctx->lock, flags); 537 538 kref_init(&ctx->refcount); 539 540 return ctx; 541 err_idr: 542 spin_lock(&user->lock); 543 list_del(&ctx->node); 544 spin_unlock(&user->lock); 545 fastrpc_channel_ctx_put(cctx); 546 kfree(ctx->maps); 547 kfree(ctx->olaps); 548 kfree(ctx); 549 550 return ERR_PTR(ret); 551 } 552 553 static struct sg_table * 554 fastrpc_map_dma_buf(struct dma_buf_attachment *attachment, 555 enum dma_data_direction dir) 556 { 557 struct fastrpc_dma_buf_attachment *a = attachment->priv; 558 struct sg_table *table; 559 int ret; 560 561 table = &a->sgt; 562 563 ret = dma_map_sgtable(attachment->dev, table, dir, 0); 564 if (ret) 565 table = ERR_PTR(ret); 566 return table; 567 } 568 569 static void fastrpc_unmap_dma_buf(struct dma_buf_attachment *attach, 570 struct sg_table *table, 571 enum dma_data_direction dir) 572 { 573 dma_unmap_sgtable(attach->dev, table, dir, 0); 574 } 575 576 static void fastrpc_release(struct dma_buf *dmabuf) 577 { 578 struct fastrpc_buf *buffer = dmabuf->priv; 579 580 fastrpc_buf_free(buffer); 581 } 582 583 static int fastrpc_dma_buf_attach(struct dma_buf *dmabuf, 584 struct dma_buf_attachment *attachment) 585 { 586 struct fastrpc_dma_buf_attachment *a; 587 struct fastrpc_buf *buffer = dmabuf->priv; 588 int ret; 589 590 a = kzalloc(sizeof(*a), GFP_KERNEL); 591 if (!a) 592 return -ENOMEM; 593 594 ret = dma_get_sgtable(buffer->dev, &a->sgt, buffer->virt, 595 FASTRPC_PHYS(buffer->phys), buffer->size); 596 if (ret < 0) { 597 dev_err(buffer->dev, "failed to get scatterlist from DMA API\n"); 598 kfree(a); 599 return -EINVAL; 600 } 601 602 a->dev = attachment->dev; 603 INIT_LIST_HEAD(&a->node); 604 attachment->priv = a; 605 606 mutex_lock(&buffer->lock); 607 list_add(&a->node, &buffer->attachments); 608 mutex_unlock(&buffer->lock); 609 610 return 0; 611 } 612 613 static void fastrpc_dma_buf_detatch(struct dma_buf *dmabuf, 614 struct dma_buf_attachment *attachment) 615 { 616 struct fastrpc_dma_buf_attachment *a = attachment->priv; 617 struct fastrpc_buf *buffer = dmabuf->priv; 618 619 mutex_lock(&buffer->lock); 620 list_del(&a->node); 621 mutex_unlock(&buffer->lock); 622 sg_free_table(&a->sgt); 623 kfree(a); 624 } 625 626 static int fastrpc_vmap(struct dma_buf *dmabuf, struct dma_buf_map *map) 627 { 628 struct fastrpc_buf *buf = dmabuf->priv; 629 630 dma_buf_map_set_vaddr(map, buf->virt); 631 632 return 0; 633 } 634 635 static int fastrpc_mmap(struct dma_buf *dmabuf, 636 struct vm_area_struct *vma) 637 { 638 struct fastrpc_buf *buf = dmabuf->priv; 639 size_t size = vma->vm_end - vma->vm_start; 640 641 return dma_mmap_coherent(buf->dev, vma, buf->virt, 642 FASTRPC_PHYS(buf->phys), size); 643 } 644 645 static const struct dma_buf_ops fastrpc_dma_buf_ops = { 646 .attach = fastrpc_dma_buf_attach, 647 .detach = fastrpc_dma_buf_detatch, 648 .map_dma_buf = fastrpc_map_dma_buf, 649 .unmap_dma_buf = fastrpc_unmap_dma_buf, 650 .mmap = fastrpc_mmap, 651 .vmap = fastrpc_vmap, 652 .release = fastrpc_release, 653 }; 654 655 static int fastrpc_map_create(struct fastrpc_user *fl, int fd, 656 u64 len, struct fastrpc_map **ppmap) 657 { 658 struct fastrpc_session_ctx *sess = fl->sctx; 659 struct fastrpc_map *map = NULL; 660 int err = 0; 661 662 if (!fastrpc_map_find(fl, fd, ppmap)) 663 return 0; 664 665 map = kzalloc(sizeof(*map), GFP_KERNEL); 666 if (!map) 667 return -ENOMEM; 668 669 INIT_LIST_HEAD(&map->node); 670 map->fl = fl; 671 map->fd = fd; 672 map->buf = dma_buf_get(fd); 673 if (IS_ERR(map->buf)) { 674 err = PTR_ERR(map->buf); 675 goto get_err; 676 } 677 678 map->attach = dma_buf_attach(map->buf, sess->dev); 679 if (IS_ERR(map->attach)) { 680 dev_err(sess->dev, "Failed to attach dmabuf\n"); 681 err = PTR_ERR(map->attach); 682 goto attach_err; 683 } 684 685 map->table = dma_buf_map_attachment(map->attach, DMA_BIDIRECTIONAL); 686 if (IS_ERR(map->table)) { 687 err = PTR_ERR(map->table); 688 goto map_err; 689 } 690 691 map->phys = sg_dma_address(map->table->sgl); 692 map->phys += ((u64)fl->sctx->sid << 32); 693 map->size = len; 694 map->va = sg_virt(map->table->sgl); 695 map->len = len; 696 kref_init(&map->refcount); 697 698 spin_lock(&fl->lock); 699 list_add_tail(&map->node, &fl->maps); 700 spin_unlock(&fl->lock); 701 *ppmap = map; 702 703 return 0; 704 705 map_err: 706 dma_buf_detach(map->buf, map->attach); 707 attach_err: 708 dma_buf_put(map->buf); 709 get_err: 710 kfree(map); 711 712 return err; 713 } 714 715 /* 716 * Fastrpc payload buffer with metadata looks like: 717 * 718 * >>>>>> START of METADATA <<<<<<<<< 719 * +---------------------------------+ 720 * | Arguments | 721 * | type:(struct fastrpc_remote_arg)| 722 * | (0 - N) | 723 * +---------------------------------+ 724 * | Invoke Buffer list | 725 * | type:(struct fastrpc_invoke_buf)| 726 * | (0 - N) | 727 * +---------------------------------+ 728 * | Page info list | 729 * | type:(struct fastrpc_phy_page) | 730 * | (0 - N) | 731 * +---------------------------------+ 732 * | Optional info | 733 * |(can be specific to SoC/Firmware)| 734 * +---------------------------------+ 735 * >>>>>>>> END of METADATA <<<<<<<<< 736 * +---------------------------------+ 737 * | Inline ARGS | 738 * | (0-N) | 739 * +---------------------------------+ 740 */ 741 742 static int fastrpc_get_meta_size(struct fastrpc_invoke_ctx *ctx) 743 { 744 int size = 0; 745 746 size = (sizeof(struct fastrpc_remote_arg) + 747 sizeof(struct fastrpc_invoke_buf) + 748 sizeof(struct fastrpc_phy_page)) * ctx->nscalars + 749 sizeof(u64) * FASTRPC_MAX_FDLIST + 750 sizeof(u32) * FASTRPC_MAX_CRCLIST; 751 752 return size; 753 } 754 755 static u64 fastrpc_get_payload_size(struct fastrpc_invoke_ctx *ctx, int metalen) 756 { 757 u64 size = 0; 758 int oix; 759 760 size = ALIGN(metalen, FASTRPC_ALIGN); 761 for (oix = 0; oix < ctx->nbufs; oix++) { 762 int i = ctx->olaps[oix].raix; 763 764 if (ctx->args[i].fd == 0 || ctx->args[i].fd == -1) { 765 766 if (ctx->olaps[oix].offset == 0) 767 size = ALIGN(size, FASTRPC_ALIGN); 768 769 size += (ctx->olaps[oix].mend - ctx->olaps[oix].mstart); 770 } 771 } 772 773 return size; 774 } 775 776 static int fastrpc_create_maps(struct fastrpc_invoke_ctx *ctx) 777 { 778 struct device *dev = ctx->fl->sctx->dev; 779 int i, err; 780 781 for (i = 0; i < ctx->nscalars; ++i) { 782 /* Make sure reserved field is set to 0 */ 783 if (ctx->args[i].reserved) 784 return -EINVAL; 785 786 if (ctx->args[i].fd == 0 || ctx->args[i].fd == -1 || 787 ctx->args[i].length == 0) 788 continue; 789 790 err = fastrpc_map_create(ctx->fl, ctx->args[i].fd, 791 ctx->args[i].length, &ctx->maps[i]); 792 if (err) { 793 dev_err(dev, "Error Creating map %d\n", err); 794 return -EINVAL; 795 } 796 797 } 798 return 0; 799 } 800 801 static int fastrpc_get_args(u32 kernel, struct fastrpc_invoke_ctx *ctx) 802 { 803 struct device *dev = ctx->fl->sctx->dev; 804 struct fastrpc_remote_arg *rpra; 805 struct fastrpc_invoke_buf *list; 806 struct fastrpc_phy_page *pages; 807 int inbufs, i, oix, err = 0; 808 u64 len, rlen, pkt_size; 809 u64 pg_start, pg_end; 810 uintptr_t args; 811 int metalen; 812 813 inbufs = REMOTE_SCALARS_INBUFS(ctx->sc); 814 metalen = fastrpc_get_meta_size(ctx); 815 pkt_size = fastrpc_get_payload_size(ctx, metalen); 816 817 err = fastrpc_create_maps(ctx); 818 if (err) 819 return err; 820 821 ctx->msg_sz = pkt_size; 822 823 err = fastrpc_buf_alloc(ctx->fl, dev, pkt_size, &ctx->buf); 824 if (err) 825 return err; 826 827 rpra = ctx->buf->virt; 828 list = ctx->buf->virt + ctx->nscalars * sizeof(*rpra); 829 pages = ctx->buf->virt + ctx->nscalars * (sizeof(*list) + 830 sizeof(*rpra)); 831 args = (uintptr_t)ctx->buf->virt + metalen; 832 rlen = pkt_size - metalen; 833 ctx->rpra = rpra; 834 835 for (oix = 0; oix < ctx->nbufs; ++oix) { 836 int mlen; 837 838 i = ctx->olaps[oix].raix; 839 len = ctx->args[i].length; 840 841 rpra[i].pv = 0; 842 rpra[i].len = len; 843 list[i].num = len ? 1 : 0; 844 list[i].pgidx = i; 845 846 if (!len) 847 continue; 848 849 if (ctx->maps[i]) { 850 struct vm_area_struct *vma = NULL; 851 852 rpra[i].pv = (u64) ctx->args[i].ptr; 853 pages[i].addr = ctx->maps[i]->phys; 854 855 mmap_read_lock(current->mm); 856 vma = find_vma(current->mm, ctx->args[i].ptr); 857 if (vma) 858 pages[i].addr += ctx->args[i].ptr - 859 vma->vm_start; 860 mmap_read_unlock(current->mm); 861 862 pg_start = (ctx->args[i].ptr & PAGE_MASK) >> PAGE_SHIFT; 863 pg_end = ((ctx->args[i].ptr + len - 1) & PAGE_MASK) >> 864 PAGE_SHIFT; 865 pages[i].size = (pg_end - pg_start + 1) * PAGE_SIZE; 866 867 } else { 868 869 if (ctx->olaps[oix].offset == 0) { 870 rlen -= ALIGN(args, FASTRPC_ALIGN) - args; 871 args = ALIGN(args, FASTRPC_ALIGN); 872 } 873 874 mlen = ctx->olaps[oix].mend - ctx->olaps[oix].mstart; 875 876 if (rlen < mlen) 877 goto bail; 878 879 rpra[i].pv = args - ctx->olaps[oix].offset; 880 pages[i].addr = ctx->buf->phys - 881 ctx->olaps[oix].offset + 882 (pkt_size - rlen); 883 pages[i].addr = pages[i].addr & PAGE_MASK; 884 885 pg_start = (args & PAGE_MASK) >> PAGE_SHIFT; 886 pg_end = ((args + len - 1) & PAGE_MASK) >> PAGE_SHIFT; 887 pages[i].size = (pg_end - pg_start + 1) * PAGE_SIZE; 888 args = args + mlen; 889 rlen -= mlen; 890 } 891 892 if (i < inbufs && !ctx->maps[i]) { 893 void *dst = (void *)(uintptr_t)rpra[i].pv; 894 void *src = (void *)(uintptr_t)ctx->args[i].ptr; 895 896 if (!kernel) { 897 if (copy_from_user(dst, (void __user *)src, 898 len)) { 899 err = -EFAULT; 900 goto bail; 901 } 902 } else { 903 memcpy(dst, src, len); 904 } 905 } 906 } 907 908 for (i = ctx->nbufs; i < ctx->nscalars; ++i) { 909 rpra[i].pv = (u64) ctx->args[i].ptr; 910 rpra[i].len = ctx->args[i].length; 911 list[i].num = ctx->args[i].length ? 1 : 0; 912 list[i].pgidx = i; 913 pages[i].addr = ctx->maps[i]->phys; 914 pages[i].size = ctx->maps[i]->size; 915 } 916 917 bail: 918 if (err) 919 dev_err(dev, "Error: get invoke args failed:%d\n", err); 920 921 return err; 922 } 923 924 static int fastrpc_put_args(struct fastrpc_invoke_ctx *ctx, 925 u32 kernel) 926 { 927 struct fastrpc_remote_arg *rpra = ctx->rpra; 928 int i, inbufs; 929 930 inbufs = REMOTE_SCALARS_INBUFS(ctx->sc); 931 932 for (i = inbufs; i < ctx->nbufs; ++i) { 933 if (!ctx->maps[i]) { 934 void *src = (void *)(uintptr_t)rpra[i].pv; 935 void *dst = (void *)(uintptr_t)ctx->args[i].ptr; 936 u64 len = rpra[i].len; 937 938 if (!kernel) { 939 if (copy_to_user((void __user *)dst, src, len)) 940 return -EFAULT; 941 } else { 942 memcpy(dst, src, len); 943 } 944 } 945 } 946 947 return 0; 948 } 949 950 static int fastrpc_invoke_send(struct fastrpc_session_ctx *sctx, 951 struct fastrpc_invoke_ctx *ctx, 952 u32 kernel, uint32_t handle) 953 { 954 struct fastrpc_channel_ctx *cctx; 955 struct fastrpc_user *fl = ctx->fl; 956 struct fastrpc_msg *msg = &ctx->msg; 957 int ret; 958 959 cctx = fl->cctx; 960 msg->pid = fl->tgid; 961 msg->tid = current->pid; 962 963 if (kernel) 964 msg->pid = 0; 965 966 msg->ctx = ctx->ctxid | fl->pd; 967 msg->handle = handle; 968 msg->sc = ctx->sc; 969 msg->addr = ctx->buf ? ctx->buf->phys : 0; 970 msg->size = roundup(ctx->msg_sz, PAGE_SIZE); 971 fastrpc_context_get(ctx); 972 973 ret = rpmsg_send(cctx->rpdev->ept, (void *)msg, sizeof(*msg)); 974 975 if (ret) 976 fastrpc_context_put(ctx); 977 978 return ret; 979 980 } 981 982 static int fastrpc_internal_invoke(struct fastrpc_user *fl, u32 kernel, 983 u32 handle, u32 sc, 984 struct fastrpc_invoke_args *args) 985 { 986 struct fastrpc_invoke_ctx *ctx = NULL; 987 int err = 0; 988 989 if (!fl->sctx) 990 return -EINVAL; 991 992 if (!fl->cctx->rpdev) 993 return -EPIPE; 994 995 if (handle == FASTRPC_INIT_HANDLE && !kernel) { 996 dev_warn_ratelimited(fl->sctx->dev, "user app trying to send a kernel RPC message (%d)\n", handle); 997 return -EPERM; 998 } 999 1000 ctx = fastrpc_context_alloc(fl, kernel, sc, args); 1001 if (IS_ERR(ctx)) 1002 return PTR_ERR(ctx); 1003 1004 if (ctx->nscalars) { 1005 err = fastrpc_get_args(kernel, ctx); 1006 if (err) 1007 goto bail; 1008 } 1009 1010 /* make sure that all CPU memory writes are seen by DSP */ 1011 dma_wmb(); 1012 /* Send invoke buffer to remote dsp */ 1013 err = fastrpc_invoke_send(fl->sctx, ctx, kernel, handle); 1014 if (err) 1015 goto bail; 1016 1017 if (kernel) { 1018 if (!wait_for_completion_timeout(&ctx->work, 10 * HZ)) 1019 err = -ETIMEDOUT; 1020 } else { 1021 err = wait_for_completion_interruptible(&ctx->work); 1022 } 1023 1024 if (err) 1025 goto bail; 1026 1027 /* Check the response from remote dsp */ 1028 err = ctx->retval; 1029 if (err) 1030 goto bail; 1031 1032 if (ctx->nscalars) { 1033 /* make sure that all memory writes by DSP are seen by CPU */ 1034 dma_rmb(); 1035 /* populate all the output buffers with results */ 1036 err = fastrpc_put_args(ctx, kernel); 1037 if (err) 1038 goto bail; 1039 } 1040 1041 bail: 1042 if (err != -ERESTARTSYS && err != -ETIMEDOUT) { 1043 /* We are done with this compute context */ 1044 spin_lock(&fl->lock); 1045 list_del(&ctx->node); 1046 spin_unlock(&fl->lock); 1047 fastrpc_context_put(ctx); 1048 } 1049 if (err) 1050 dev_dbg(fl->sctx->dev, "Error: Invoke Failed %d\n", err); 1051 1052 return err; 1053 } 1054 1055 static int fastrpc_init_create_process(struct fastrpc_user *fl, 1056 char __user *argp) 1057 { 1058 struct fastrpc_init_create init; 1059 struct fastrpc_invoke_args *args; 1060 struct fastrpc_phy_page pages[1]; 1061 struct fastrpc_map *map = NULL; 1062 struct fastrpc_buf *imem = NULL; 1063 int memlen; 1064 int err; 1065 struct { 1066 int pgid; 1067 u32 namelen; 1068 u32 filelen; 1069 u32 pageslen; 1070 u32 attrs; 1071 u32 siglen; 1072 } inbuf; 1073 u32 sc; 1074 1075 args = kcalloc(FASTRPC_CREATE_PROCESS_NARGS, sizeof(*args), GFP_KERNEL); 1076 if (!args) 1077 return -ENOMEM; 1078 1079 if (copy_from_user(&init, argp, sizeof(init))) { 1080 err = -EFAULT; 1081 goto err; 1082 } 1083 1084 if (init.filelen > INIT_FILELEN_MAX) { 1085 err = -EINVAL; 1086 goto err; 1087 } 1088 1089 inbuf.pgid = fl->tgid; 1090 inbuf.namelen = strlen(current->comm) + 1; 1091 inbuf.filelen = init.filelen; 1092 inbuf.pageslen = 1; 1093 inbuf.attrs = init.attrs; 1094 inbuf.siglen = init.siglen; 1095 fl->pd = USER_PD; 1096 1097 if (init.filelen && init.filefd) { 1098 err = fastrpc_map_create(fl, init.filefd, init.filelen, &map); 1099 if (err) 1100 goto err; 1101 } 1102 1103 memlen = ALIGN(max(INIT_FILELEN_MAX, (int)init.filelen * 4), 1104 1024 * 1024); 1105 err = fastrpc_buf_alloc(fl, fl->sctx->dev, memlen, 1106 &imem); 1107 if (err) 1108 goto err_alloc; 1109 1110 fl->init_mem = imem; 1111 args[0].ptr = (u64)(uintptr_t)&inbuf; 1112 args[0].length = sizeof(inbuf); 1113 args[0].fd = -1; 1114 1115 args[1].ptr = (u64)(uintptr_t)current->comm; 1116 args[1].length = inbuf.namelen; 1117 args[1].fd = -1; 1118 1119 args[2].ptr = (u64) init.file; 1120 args[2].length = inbuf.filelen; 1121 args[2].fd = init.filefd; 1122 1123 pages[0].addr = imem->phys; 1124 pages[0].size = imem->size; 1125 1126 args[3].ptr = (u64)(uintptr_t) pages; 1127 args[3].length = 1 * sizeof(*pages); 1128 args[3].fd = -1; 1129 1130 args[4].ptr = (u64)(uintptr_t)&inbuf.attrs; 1131 args[4].length = sizeof(inbuf.attrs); 1132 args[4].fd = -1; 1133 1134 args[5].ptr = (u64)(uintptr_t) &inbuf.siglen; 1135 args[5].length = sizeof(inbuf.siglen); 1136 args[5].fd = -1; 1137 1138 sc = FASTRPC_SCALARS(FASTRPC_RMID_INIT_CREATE, 4, 0); 1139 if (init.attrs) 1140 sc = FASTRPC_SCALARS(FASTRPC_RMID_INIT_CREATE_ATTR, 6, 0); 1141 1142 err = fastrpc_internal_invoke(fl, true, FASTRPC_INIT_HANDLE, 1143 sc, args); 1144 if (err) 1145 goto err_invoke; 1146 1147 kfree(args); 1148 1149 return 0; 1150 1151 err_invoke: 1152 fl->init_mem = NULL; 1153 fastrpc_buf_free(imem); 1154 err_alloc: 1155 if (map) { 1156 spin_lock(&fl->lock); 1157 list_del(&map->node); 1158 spin_unlock(&fl->lock); 1159 fastrpc_map_put(map); 1160 } 1161 err: 1162 kfree(args); 1163 1164 return err; 1165 } 1166 1167 static struct fastrpc_session_ctx *fastrpc_session_alloc( 1168 struct fastrpc_channel_ctx *cctx) 1169 { 1170 struct fastrpc_session_ctx *session = NULL; 1171 unsigned long flags; 1172 int i; 1173 1174 spin_lock_irqsave(&cctx->lock, flags); 1175 for (i = 0; i < cctx->sesscount; i++) { 1176 if (!cctx->session[i].used && cctx->session[i].valid) { 1177 cctx->session[i].used = true; 1178 session = &cctx->session[i]; 1179 break; 1180 } 1181 } 1182 spin_unlock_irqrestore(&cctx->lock, flags); 1183 1184 return session; 1185 } 1186 1187 static void fastrpc_session_free(struct fastrpc_channel_ctx *cctx, 1188 struct fastrpc_session_ctx *session) 1189 { 1190 unsigned long flags; 1191 1192 spin_lock_irqsave(&cctx->lock, flags); 1193 session->used = false; 1194 spin_unlock_irqrestore(&cctx->lock, flags); 1195 } 1196 1197 static int fastrpc_release_current_dsp_process(struct fastrpc_user *fl) 1198 { 1199 struct fastrpc_invoke_args args[1]; 1200 int tgid = 0; 1201 u32 sc; 1202 1203 tgid = fl->tgid; 1204 args[0].ptr = (u64)(uintptr_t) &tgid; 1205 args[0].length = sizeof(tgid); 1206 args[0].fd = -1; 1207 args[0].reserved = 0; 1208 sc = FASTRPC_SCALARS(FASTRPC_RMID_INIT_RELEASE, 1, 0); 1209 1210 return fastrpc_internal_invoke(fl, true, FASTRPC_INIT_HANDLE, 1211 sc, &args[0]); 1212 } 1213 1214 static int fastrpc_device_release(struct inode *inode, struct file *file) 1215 { 1216 struct fastrpc_user *fl = (struct fastrpc_user *)file->private_data; 1217 struct fastrpc_channel_ctx *cctx = fl->cctx; 1218 struct fastrpc_invoke_ctx *ctx, *n; 1219 struct fastrpc_map *map, *m; 1220 struct fastrpc_buf *buf, *b; 1221 unsigned long flags; 1222 1223 fastrpc_release_current_dsp_process(fl); 1224 1225 spin_lock_irqsave(&cctx->lock, flags); 1226 list_del(&fl->user); 1227 spin_unlock_irqrestore(&cctx->lock, flags); 1228 1229 if (fl->init_mem) 1230 fastrpc_buf_free(fl->init_mem); 1231 1232 list_for_each_entry_safe(ctx, n, &fl->pending, node) { 1233 list_del(&ctx->node); 1234 fastrpc_context_put(ctx); 1235 } 1236 1237 list_for_each_entry_safe(map, m, &fl->maps, node) { 1238 list_del(&map->node); 1239 fastrpc_map_put(map); 1240 } 1241 1242 list_for_each_entry_safe(buf, b, &fl->mmaps, node) { 1243 list_del(&buf->node); 1244 fastrpc_buf_free(buf); 1245 } 1246 1247 fastrpc_session_free(cctx, fl->sctx); 1248 fastrpc_channel_ctx_put(cctx); 1249 1250 mutex_destroy(&fl->mutex); 1251 kfree(fl); 1252 file->private_data = NULL; 1253 1254 return 0; 1255 } 1256 1257 static int fastrpc_device_open(struct inode *inode, struct file *filp) 1258 { 1259 struct fastrpc_channel_ctx *cctx; 1260 struct fastrpc_device *fdevice; 1261 struct fastrpc_user *fl = NULL; 1262 unsigned long flags; 1263 1264 fdevice = miscdev_to_fdevice(filp->private_data); 1265 cctx = fdevice->cctx; 1266 1267 fl = kzalloc(sizeof(*fl), GFP_KERNEL); 1268 if (!fl) 1269 return -ENOMEM; 1270 1271 /* Released in fastrpc_device_release() */ 1272 fastrpc_channel_ctx_get(cctx); 1273 1274 filp->private_data = fl; 1275 spin_lock_init(&fl->lock); 1276 mutex_init(&fl->mutex); 1277 INIT_LIST_HEAD(&fl->pending); 1278 INIT_LIST_HEAD(&fl->maps); 1279 INIT_LIST_HEAD(&fl->mmaps); 1280 INIT_LIST_HEAD(&fl->user); 1281 fl->tgid = current->tgid; 1282 fl->cctx = cctx; 1283 1284 fl->sctx = fastrpc_session_alloc(cctx); 1285 if (!fl->sctx) { 1286 dev_err(&cctx->rpdev->dev, "No session available\n"); 1287 mutex_destroy(&fl->mutex); 1288 kfree(fl); 1289 1290 return -EBUSY; 1291 } 1292 1293 spin_lock_irqsave(&cctx->lock, flags); 1294 list_add_tail(&fl->user, &cctx->users); 1295 spin_unlock_irqrestore(&cctx->lock, flags); 1296 1297 return 0; 1298 } 1299 1300 static int fastrpc_dmabuf_alloc(struct fastrpc_user *fl, char __user *argp) 1301 { 1302 struct fastrpc_alloc_dma_buf bp; 1303 DEFINE_DMA_BUF_EXPORT_INFO(exp_info); 1304 struct fastrpc_buf *buf = NULL; 1305 int err; 1306 1307 if (copy_from_user(&bp, argp, sizeof(bp))) 1308 return -EFAULT; 1309 1310 err = fastrpc_buf_alloc(fl, fl->sctx->dev, bp.size, &buf); 1311 if (err) 1312 return err; 1313 exp_info.ops = &fastrpc_dma_buf_ops; 1314 exp_info.size = bp.size; 1315 exp_info.flags = O_RDWR; 1316 exp_info.priv = buf; 1317 buf->dmabuf = dma_buf_export(&exp_info); 1318 if (IS_ERR(buf->dmabuf)) { 1319 err = PTR_ERR(buf->dmabuf); 1320 fastrpc_buf_free(buf); 1321 return err; 1322 } 1323 1324 bp.fd = dma_buf_fd(buf->dmabuf, O_ACCMODE); 1325 if (bp.fd < 0) { 1326 dma_buf_put(buf->dmabuf); 1327 return -EINVAL; 1328 } 1329 1330 if (copy_to_user(argp, &bp, sizeof(bp))) { 1331 /* 1332 * The usercopy failed, but we can't do much about it, as 1333 * dma_buf_fd() already called fd_install() and made the 1334 * file descriptor accessible for the current process. It 1335 * might already be closed and dmabuf no longer valid when 1336 * we reach this point. Therefore "leak" the fd and rely on 1337 * the process exit path to do any required cleanup. 1338 */ 1339 return -EFAULT; 1340 } 1341 1342 return 0; 1343 } 1344 1345 static int fastrpc_init_attach(struct fastrpc_user *fl, int pd) 1346 { 1347 struct fastrpc_invoke_args args[1]; 1348 int tgid = fl->tgid; 1349 u32 sc; 1350 1351 args[0].ptr = (u64)(uintptr_t) &tgid; 1352 args[0].length = sizeof(tgid); 1353 args[0].fd = -1; 1354 args[0].reserved = 0; 1355 sc = FASTRPC_SCALARS(FASTRPC_RMID_INIT_ATTACH, 1, 0); 1356 fl->pd = pd; 1357 1358 return fastrpc_internal_invoke(fl, true, FASTRPC_INIT_HANDLE, 1359 sc, &args[0]); 1360 } 1361 1362 static int fastrpc_invoke(struct fastrpc_user *fl, char __user *argp) 1363 { 1364 struct fastrpc_invoke_args *args = NULL; 1365 struct fastrpc_invoke inv; 1366 u32 nscalars; 1367 int err; 1368 1369 if (copy_from_user(&inv, argp, sizeof(inv))) 1370 return -EFAULT; 1371 1372 /* nscalars is truncated here to max supported value */ 1373 nscalars = REMOTE_SCALARS_LENGTH(inv.sc); 1374 if (nscalars) { 1375 args = kcalloc(nscalars, sizeof(*args), GFP_KERNEL); 1376 if (!args) 1377 return -ENOMEM; 1378 1379 if (copy_from_user(args, (void __user *)(uintptr_t)inv.args, 1380 nscalars * sizeof(*args))) { 1381 kfree(args); 1382 return -EFAULT; 1383 } 1384 } 1385 1386 err = fastrpc_internal_invoke(fl, false, inv.handle, inv.sc, args); 1387 kfree(args); 1388 1389 return err; 1390 } 1391 1392 static int fastrpc_get_info_from_dsp(struct fastrpc_user *fl, uint32_t *dsp_attr_buf, 1393 uint32_t dsp_attr_buf_len) 1394 { 1395 struct fastrpc_invoke_args args[2] = { 0 }; 1396 1397 /* Capability filled in userspace */ 1398 dsp_attr_buf[0] = 0; 1399 1400 args[0].ptr = (u64)(uintptr_t)&dsp_attr_buf_len; 1401 args[0].length = sizeof(dsp_attr_buf_len); 1402 args[0].fd = -1; 1403 args[1].ptr = (u64)(uintptr_t)&dsp_attr_buf[1]; 1404 args[1].length = dsp_attr_buf_len; 1405 args[1].fd = -1; 1406 fl->pd = 1; 1407 1408 return fastrpc_internal_invoke(fl, true, FASTRPC_DSP_UTILITIES_HANDLE, 1409 FASTRPC_SCALARS(0, 1, 1), args); 1410 } 1411 1412 static int fastrpc_get_info_from_kernel(struct fastrpc_ioctl_capability *cap, 1413 struct fastrpc_user *fl) 1414 { 1415 struct fastrpc_channel_ctx *cctx = fl->cctx; 1416 uint32_t attribute_id = cap->attribute_id; 1417 uint32_t *dsp_attributes; 1418 unsigned long flags; 1419 uint32_t domain = cap->domain; 1420 int err; 1421 1422 spin_lock_irqsave(&cctx->lock, flags); 1423 /* check if we already have queried dsp for attributes */ 1424 if (cctx->valid_attributes) { 1425 spin_unlock_irqrestore(&cctx->lock, flags); 1426 goto done; 1427 } 1428 spin_unlock_irqrestore(&cctx->lock, flags); 1429 1430 dsp_attributes = kzalloc(FASTRPC_MAX_DSP_ATTRIBUTES_LEN, GFP_KERNEL); 1431 if (!dsp_attributes) 1432 return -ENOMEM; 1433 1434 err = fastrpc_get_info_from_dsp(fl, dsp_attributes, FASTRPC_MAX_DSP_ATTRIBUTES_LEN); 1435 if (err == DSP_UNSUPPORTED_API) { 1436 dev_info(&cctx->rpdev->dev, 1437 "Warning: DSP capabilities not supported on domain: %d\n", domain); 1438 kfree(dsp_attributes); 1439 return -EOPNOTSUPP; 1440 } else if (err) { 1441 dev_err(&cctx->rpdev->dev, "Error: dsp information is incorrect err: %d\n", err); 1442 kfree(dsp_attributes); 1443 return err; 1444 } 1445 1446 spin_lock_irqsave(&cctx->lock, flags); 1447 memcpy(cctx->dsp_attributes, dsp_attributes, FASTRPC_MAX_DSP_ATTRIBUTES_LEN); 1448 cctx->valid_attributes = true; 1449 spin_unlock_irqrestore(&cctx->lock, flags); 1450 kfree(dsp_attributes); 1451 done: 1452 cap->capability = cctx->dsp_attributes[attribute_id]; 1453 return 0; 1454 } 1455 1456 static int fastrpc_get_dsp_info(struct fastrpc_user *fl, char __user *argp) 1457 { 1458 struct fastrpc_ioctl_capability cap = {0}; 1459 int err = 0; 1460 1461 if (copy_from_user(&cap, argp, sizeof(cap))) 1462 return -EFAULT; 1463 1464 cap.capability = 0; 1465 if (cap.domain >= FASTRPC_DEV_MAX) { 1466 dev_err(&fl->cctx->rpdev->dev, "Error: Invalid domain id:%d, err:%d\n", 1467 cap.domain, err); 1468 return -ECHRNG; 1469 } 1470 1471 /* Fastrpc Capablities does not support modem domain */ 1472 if (cap.domain == MDSP_DOMAIN_ID) { 1473 dev_err(&fl->cctx->rpdev->dev, "Error: modem not supported %d\n", err); 1474 return -ECHRNG; 1475 } 1476 1477 if (cap.attribute_id >= FASTRPC_MAX_DSP_ATTRIBUTES) { 1478 dev_err(&fl->cctx->rpdev->dev, "Error: invalid attribute: %d, err: %d\n", 1479 cap.attribute_id, err); 1480 return -EOVERFLOW; 1481 } 1482 1483 err = fastrpc_get_info_from_kernel(&cap, fl); 1484 if (err) 1485 return err; 1486 1487 if (copy_to_user(argp, &cap.capability, sizeof(cap.capability))) 1488 return -EFAULT; 1489 1490 return 0; 1491 } 1492 1493 static int fastrpc_req_munmap_impl(struct fastrpc_user *fl, 1494 struct fastrpc_req_munmap *req) 1495 { 1496 struct fastrpc_invoke_args args[1] = { [0] = { 0 } }; 1497 struct fastrpc_buf *buf, *b; 1498 struct fastrpc_munmap_req_msg req_msg; 1499 struct device *dev = fl->sctx->dev; 1500 int err; 1501 u32 sc; 1502 1503 spin_lock(&fl->lock); 1504 list_for_each_entry_safe(buf, b, &fl->mmaps, node) { 1505 if ((buf->raddr == req->vaddrout) && (buf->size == req->size)) 1506 break; 1507 buf = NULL; 1508 } 1509 spin_unlock(&fl->lock); 1510 1511 if (!buf) { 1512 dev_err(dev, "mmap not in list\n"); 1513 return -EINVAL; 1514 } 1515 1516 req_msg.pgid = fl->tgid; 1517 req_msg.size = buf->size; 1518 req_msg.vaddr = buf->raddr; 1519 1520 args[0].ptr = (u64) (uintptr_t) &req_msg; 1521 args[0].length = sizeof(req_msg); 1522 1523 sc = FASTRPC_SCALARS(FASTRPC_RMID_INIT_MUNMAP, 1, 0); 1524 err = fastrpc_internal_invoke(fl, true, FASTRPC_INIT_HANDLE, sc, 1525 &args[0]); 1526 if (!err) { 1527 dev_dbg(dev, "unmmap\tpt 0x%09lx OK\n", buf->raddr); 1528 spin_lock(&fl->lock); 1529 list_del(&buf->node); 1530 spin_unlock(&fl->lock); 1531 fastrpc_buf_free(buf); 1532 } else { 1533 dev_err(dev, "unmmap\tpt 0x%09lx ERROR\n", buf->raddr); 1534 } 1535 1536 return err; 1537 } 1538 1539 static int fastrpc_req_munmap(struct fastrpc_user *fl, char __user *argp) 1540 { 1541 struct fastrpc_req_munmap req; 1542 1543 if (copy_from_user(&req, argp, sizeof(req))) 1544 return -EFAULT; 1545 1546 return fastrpc_req_munmap_impl(fl, &req); 1547 } 1548 1549 static int fastrpc_req_mmap(struct fastrpc_user *fl, char __user *argp) 1550 { 1551 struct fastrpc_invoke_args args[3] = { [0 ... 2] = { 0 } }; 1552 struct fastrpc_buf *buf = NULL; 1553 struct fastrpc_mmap_req_msg req_msg; 1554 struct fastrpc_mmap_rsp_msg rsp_msg; 1555 struct fastrpc_req_munmap req_unmap; 1556 struct fastrpc_phy_page pages; 1557 struct fastrpc_req_mmap req; 1558 struct device *dev = fl->sctx->dev; 1559 int err; 1560 u32 sc; 1561 1562 if (copy_from_user(&req, argp, sizeof(req))) 1563 return -EFAULT; 1564 1565 if (req.flags != ADSP_MMAP_ADD_PAGES) { 1566 dev_err(dev, "flag not supported 0x%x\n", req.flags); 1567 return -EINVAL; 1568 } 1569 1570 if (req.vaddrin) { 1571 dev_err(dev, "adding user allocated pages is not supported\n"); 1572 return -EINVAL; 1573 } 1574 1575 err = fastrpc_buf_alloc(fl, fl->sctx->dev, req.size, &buf); 1576 if (err) { 1577 dev_err(dev, "failed to allocate buffer\n"); 1578 return err; 1579 } 1580 1581 req_msg.pgid = fl->tgid; 1582 req_msg.flags = req.flags; 1583 req_msg.vaddr = req.vaddrin; 1584 req_msg.num = sizeof(pages); 1585 1586 args[0].ptr = (u64) (uintptr_t) &req_msg; 1587 args[0].length = sizeof(req_msg); 1588 1589 pages.addr = buf->phys; 1590 pages.size = buf->size; 1591 1592 args[1].ptr = (u64) (uintptr_t) &pages; 1593 args[1].length = sizeof(pages); 1594 1595 args[2].ptr = (u64) (uintptr_t) &rsp_msg; 1596 args[2].length = sizeof(rsp_msg); 1597 1598 sc = FASTRPC_SCALARS(FASTRPC_RMID_INIT_MMAP, 2, 1); 1599 err = fastrpc_internal_invoke(fl, true, FASTRPC_INIT_HANDLE, sc, 1600 &args[0]); 1601 if (err) { 1602 dev_err(dev, "mmap error (len 0x%08llx)\n", buf->size); 1603 goto err_invoke; 1604 } 1605 1606 /* update the buffer to be able to deallocate the memory on the DSP */ 1607 buf->raddr = (uintptr_t) rsp_msg.vaddr; 1608 1609 /* let the client know the address to use */ 1610 req.vaddrout = rsp_msg.vaddr; 1611 1612 spin_lock(&fl->lock); 1613 list_add_tail(&buf->node, &fl->mmaps); 1614 spin_unlock(&fl->lock); 1615 1616 if (copy_to_user((void __user *)argp, &req, sizeof(req))) { 1617 /* unmap the memory and release the buffer */ 1618 req_unmap.vaddrout = buf->raddr; 1619 req_unmap.size = buf->size; 1620 fastrpc_req_munmap_impl(fl, &req_unmap); 1621 return -EFAULT; 1622 } 1623 1624 dev_dbg(dev, "mmap\t\tpt 0x%09lx OK [len 0x%08llx]\n", 1625 buf->raddr, buf->size); 1626 1627 return 0; 1628 1629 err_invoke: 1630 fastrpc_buf_free(buf); 1631 1632 return err; 1633 } 1634 1635 static int fastrpc_req_mem_unmap_impl(struct fastrpc_user *fl, struct fastrpc_mem_unmap *req) 1636 { 1637 struct fastrpc_invoke_args args[1] = { [0] = { 0 } }; 1638 struct fastrpc_map *map = NULL, *m; 1639 struct fastrpc_mem_unmap_req_msg req_msg = { 0 }; 1640 int err = 0; 1641 u32 sc; 1642 struct device *dev = fl->sctx->dev; 1643 1644 spin_lock(&fl->lock); 1645 list_for_each_entry_safe(map, m, &fl->maps, node) { 1646 if ((req->fd < 0 || map->fd == req->fd) && (map->raddr == req->vaddr)) 1647 break; 1648 map = NULL; 1649 } 1650 1651 spin_unlock(&fl->lock); 1652 1653 if (!map) { 1654 dev_err(dev, "map not in list\n"); 1655 return -EINVAL; 1656 } 1657 1658 req_msg.pgid = fl->tgid; 1659 req_msg.len = map->len; 1660 req_msg.vaddrin = map->raddr; 1661 req_msg.fd = map->fd; 1662 1663 args[0].ptr = (u64) (uintptr_t) &req_msg; 1664 args[0].length = sizeof(req_msg); 1665 1666 sc = FASTRPC_SCALARS(FASTRPC_RMID_INIT_MEM_UNMAP, 1, 0); 1667 err = fastrpc_internal_invoke(fl, true, FASTRPC_INIT_HANDLE, sc, 1668 &args[0]); 1669 fastrpc_map_put(map); 1670 if (err) 1671 dev_err(dev, "unmmap\tpt fd = %d, 0x%09llx error\n", map->fd, map->raddr); 1672 1673 return err; 1674 } 1675 1676 static int fastrpc_req_mem_unmap(struct fastrpc_user *fl, char __user *argp) 1677 { 1678 struct fastrpc_mem_unmap req; 1679 1680 if (copy_from_user(&req, argp, sizeof(req))) 1681 return -EFAULT; 1682 1683 return fastrpc_req_mem_unmap_impl(fl, &req); 1684 } 1685 1686 static int fastrpc_req_mem_map(struct fastrpc_user *fl, char __user *argp) 1687 { 1688 struct fastrpc_invoke_args args[4] = { [0 ... 3] = { 0 } }; 1689 struct fastrpc_mem_map_req_msg req_msg = { 0 }; 1690 struct fastrpc_mmap_rsp_msg rsp_msg = { 0 }; 1691 struct fastrpc_mem_unmap req_unmap = { 0 }; 1692 struct fastrpc_phy_page pages = { 0 }; 1693 struct fastrpc_mem_map req; 1694 struct device *dev = fl->sctx->dev; 1695 struct fastrpc_map *map = NULL; 1696 int err; 1697 u32 sc; 1698 1699 if (copy_from_user(&req, argp, sizeof(req))) 1700 return -EFAULT; 1701 1702 /* create SMMU mapping */ 1703 err = fastrpc_map_create(fl, req.fd, req.length, 0, &map); 1704 if (err) { 1705 dev_err(dev, "failed to map buffer, fd = %d\n", req.fd); 1706 return err; 1707 } 1708 1709 req_msg.pgid = fl->tgid; 1710 req_msg.fd = req.fd; 1711 req_msg.offset = req.offset; 1712 req_msg.vaddrin = req.vaddrin; 1713 map->va = (void *) (uintptr_t) req.vaddrin; 1714 req_msg.flags = req.flags; 1715 req_msg.num = sizeof(pages); 1716 req_msg.data_len = 0; 1717 1718 args[0].ptr = (u64) (uintptr_t) &req_msg; 1719 args[0].length = sizeof(req_msg); 1720 1721 pages.addr = map->phys; 1722 pages.size = map->size; 1723 1724 args[1].ptr = (u64) (uintptr_t) &pages; 1725 args[1].length = sizeof(pages); 1726 1727 args[2].ptr = (u64) (uintptr_t) &pages; 1728 args[2].length = 0; 1729 1730 args[3].ptr = (u64) (uintptr_t) &rsp_msg; 1731 args[3].length = sizeof(rsp_msg); 1732 1733 sc = FASTRPC_SCALARS(FASTRPC_RMID_INIT_MEM_MAP, 3, 1); 1734 err = fastrpc_internal_invoke(fl, true, FASTRPC_INIT_HANDLE, sc, &args[0]); 1735 if (err) { 1736 dev_err(dev, "mem mmap error, fd %d, vaddr %llx, size %lld\n", 1737 req.fd, req.vaddrin, map->size); 1738 goto err_invoke; 1739 } 1740 1741 /* update the buffer to be able to deallocate the memory on the DSP */ 1742 map->raddr = rsp_msg.vaddr; 1743 1744 /* let the client know the address to use */ 1745 req.vaddrout = rsp_msg.vaddr; 1746 1747 if (copy_to_user((void __user *)argp, &req, sizeof(req))) { 1748 /* unmap the memory and release the buffer */ 1749 req_unmap.vaddr = (uintptr_t) rsp_msg.vaddr; 1750 req_unmap.length = map->size; 1751 fastrpc_req_mem_unmap_impl(fl, &req_unmap); 1752 return -EFAULT; 1753 } 1754 1755 return 0; 1756 1757 err_invoke: 1758 fastrpc_map_put(map); 1759 1760 return err; 1761 } 1762 1763 static long fastrpc_device_ioctl(struct file *file, unsigned int cmd, 1764 unsigned long arg) 1765 { 1766 struct fastrpc_user *fl = (struct fastrpc_user *)file->private_data; 1767 char __user *argp = (char __user *)arg; 1768 int err; 1769 1770 switch (cmd) { 1771 case FASTRPC_IOCTL_INVOKE: 1772 err = fastrpc_invoke(fl, argp); 1773 break; 1774 case FASTRPC_IOCTL_INIT_ATTACH: 1775 err = fastrpc_init_attach(fl, AUDIO_PD); 1776 break; 1777 case FASTRPC_IOCTL_INIT_ATTACH_SNS: 1778 err = fastrpc_init_attach(fl, SENSORS_PD); 1779 break; 1780 case FASTRPC_IOCTL_INIT_CREATE: 1781 err = fastrpc_init_create_process(fl, argp); 1782 break; 1783 case FASTRPC_IOCTL_ALLOC_DMA_BUFF: 1784 err = fastrpc_dmabuf_alloc(fl, argp); 1785 break; 1786 case FASTRPC_IOCTL_MMAP: 1787 err = fastrpc_req_mmap(fl, argp); 1788 break; 1789 case FASTRPC_IOCTL_MUNMAP: 1790 err = fastrpc_req_munmap(fl, argp); 1791 break; 1792 case FASTRPC_IOCTL_MEM_MAP: 1793 err = fastrpc_req_mem_map(fl, argp); 1794 break; 1795 case FASTRPC_IOCTL_MEM_UNMAP: 1796 err = fastrpc_req_mem_unmap(fl, argp); 1797 break; 1798 case FASTRPC_IOCTL_GET_DSP_INFO: 1799 err = fastrpc_get_dsp_info(fl, argp); 1800 break; 1801 default: 1802 err = -ENOTTY; 1803 break; 1804 } 1805 1806 return err; 1807 } 1808 1809 static const struct file_operations fastrpc_fops = { 1810 .open = fastrpc_device_open, 1811 .release = fastrpc_device_release, 1812 .unlocked_ioctl = fastrpc_device_ioctl, 1813 .compat_ioctl = fastrpc_device_ioctl, 1814 }; 1815 1816 static int fastrpc_cb_probe(struct platform_device *pdev) 1817 { 1818 struct fastrpc_channel_ctx *cctx; 1819 struct fastrpc_session_ctx *sess; 1820 struct device *dev = &pdev->dev; 1821 int i, sessions = 0; 1822 unsigned long flags; 1823 int rc; 1824 1825 cctx = dev_get_drvdata(dev->parent); 1826 if (!cctx) 1827 return -EINVAL; 1828 1829 of_property_read_u32(dev->of_node, "qcom,nsessions", &sessions); 1830 1831 spin_lock_irqsave(&cctx->lock, flags); 1832 sess = &cctx->session[cctx->sesscount]; 1833 sess->used = false; 1834 sess->valid = true; 1835 sess->dev = dev; 1836 dev_set_drvdata(dev, sess); 1837 1838 if (of_property_read_u32(dev->of_node, "reg", &sess->sid)) 1839 dev_info(dev, "FastRPC Session ID not specified in DT\n"); 1840 1841 if (sessions > 0) { 1842 struct fastrpc_session_ctx *dup_sess; 1843 1844 for (i = 1; i < sessions; i++) { 1845 if (cctx->sesscount++ >= FASTRPC_MAX_SESSIONS) 1846 break; 1847 dup_sess = &cctx->session[cctx->sesscount]; 1848 memcpy(dup_sess, sess, sizeof(*dup_sess)); 1849 } 1850 } 1851 cctx->sesscount++; 1852 spin_unlock_irqrestore(&cctx->lock, flags); 1853 rc = dma_set_mask(dev, DMA_BIT_MASK(32)); 1854 if (rc) { 1855 dev_err(dev, "32-bit DMA enable failed\n"); 1856 return rc; 1857 } 1858 1859 return 0; 1860 } 1861 1862 static int fastrpc_cb_remove(struct platform_device *pdev) 1863 { 1864 struct fastrpc_channel_ctx *cctx = dev_get_drvdata(pdev->dev.parent); 1865 struct fastrpc_session_ctx *sess = dev_get_drvdata(&pdev->dev); 1866 unsigned long flags; 1867 int i; 1868 1869 spin_lock_irqsave(&cctx->lock, flags); 1870 for (i = 1; i < FASTRPC_MAX_SESSIONS; i++) { 1871 if (cctx->session[i].sid == sess->sid) { 1872 cctx->session[i].valid = false; 1873 cctx->sesscount--; 1874 } 1875 } 1876 spin_unlock_irqrestore(&cctx->lock, flags); 1877 1878 return 0; 1879 } 1880 1881 static const struct of_device_id fastrpc_match_table[] = { 1882 { .compatible = "qcom,fastrpc-compute-cb", }, 1883 {} 1884 }; 1885 1886 static struct platform_driver fastrpc_cb_driver = { 1887 .probe = fastrpc_cb_probe, 1888 .remove = fastrpc_cb_remove, 1889 .driver = { 1890 .name = "qcom,fastrpc-cb", 1891 .of_match_table = fastrpc_match_table, 1892 .suppress_bind_attrs = true, 1893 }, 1894 }; 1895 1896 static int fastrpc_device_register(struct device *dev, struct fastrpc_channel_ctx *cctx, 1897 bool is_secured, const char *domain) 1898 { 1899 struct fastrpc_device *fdev; 1900 int err; 1901 1902 fdev = devm_kzalloc(dev, sizeof(*fdev), GFP_KERNEL); 1903 if (!fdev) 1904 return -ENOMEM; 1905 1906 fdev->secure = is_secured; 1907 fdev->cctx = cctx; 1908 fdev->miscdev.minor = MISC_DYNAMIC_MINOR; 1909 fdev->miscdev.fops = &fastrpc_fops; 1910 fdev->miscdev.name = devm_kasprintf(dev, GFP_KERNEL, "fastrpc-%s%s", 1911 domain, is_secured ? "-secure" : ""); 1912 err = misc_register(&fdev->miscdev); 1913 if (!err) { 1914 if (is_secured) 1915 cctx->secure_fdevice = fdev; 1916 else 1917 cctx->fdevice = fdev; 1918 } 1919 1920 return err; 1921 } 1922 1923 static int fastrpc_rpmsg_probe(struct rpmsg_device *rpdev) 1924 { 1925 struct device *rdev = &rpdev->dev; 1926 struct fastrpc_channel_ctx *data; 1927 int i, err, domain_id = -1; 1928 const char *domain; 1929 bool secure_dsp; 1930 1931 err = of_property_read_string(rdev->of_node, "label", &domain); 1932 if (err) { 1933 dev_info(rdev, "FastRPC Domain not specified in DT\n"); 1934 return err; 1935 } 1936 1937 for (i = 0; i <= CDSP_DOMAIN_ID; i++) { 1938 if (!strcmp(domains[i], domain)) { 1939 domain_id = i; 1940 break; 1941 } 1942 } 1943 1944 if (domain_id < 0) { 1945 dev_info(rdev, "FastRPC Invalid Domain ID %d\n", domain_id); 1946 return -EINVAL; 1947 } 1948 1949 data = kzalloc(sizeof(*data), GFP_KERNEL); 1950 if (!data) 1951 return -ENOMEM; 1952 1953 1954 secure_dsp = !(of_property_read_bool(rdev->of_node, "qcom,non-secure-domain")); 1955 data->secure = secure_dsp; 1956 1957 switch (domain_id) { 1958 case ADSP_DOMAIN_ID: 1959 case MDSP_DOMAIN_ID: 1960 case SDSP_DOMAIN_ID: 1961 err = fastrpc_device_register(rdev, data, secure_dsp, domains[domain_id]); 1962 if (err) 1963 goto fdev_error; 1964 break; 1965 case CDSP_DOMAIN_ID: 1966 /* Create both device nodes so that we can allow both Signed and Unsigned PD */ 1967 err = fastrpc_device_register(rdev, data, true, domains[domain_id]); 1968 if (err) 1969 goto fdev_error; 1970 1971 err = fastrpc_device_register(rdev, data, false, domains[domain_id]); 1972 if (err) 1973 goto fdev_error; 1974 break; 1975 default: 1976 err = -EINVAL; 1977 goto fdev_error; 1978 } 1979 1980 kref_init(&data->refcount); 1981 1982 dev_set_drvdata(&rpdev->dev, data); 1983 dma_set_mask_and_coherent(rdev, DMA_BIT_MASK(32)); 1984 INIT_LIST_HEAD(&data->users); 1985 spin_lock_init(&data->lock); 1986 idr_init(&data->ctx_idr); 1987 data->domain_id = domain_id; 1988 data->rpdev = rpdev; 1989 1990 return of_platform_populate(rdev->of_node, NULL, NULL, rdev); 1991 fdev_error: 1992 kfree(data); 1993 return err; 1994 } 1995 1996 static void fastrpc_notify_users(struct fastrpc_user *user) 1997 { 1998 struct fastrpc_invoke_ctx *ctx; 1999 2000 spin_lock(&user->lock); 2001 list_for_each_entry(ctx, &user->pending, node) 2002 complete(&ctx->work); 2003 spin_unlock(&user->lock); 2004 } 2005 2006 static void fastrpc_rpmsg_remove(struct rpmsg_device *rpdev) 2007 { 2008 struct fastrpc_channel_ctx *cctx = dev_get_drvdata(&rpdev->dev); 2009 struct fastrpc_user *user; 2010 unsigned long flags; 2011 2012 spin_lock_irqsave(&cctx->lock, flags); 2013 list_for_each_entry(user, &cctx->users, user) 2014 fastrpc_notify_users(user); 2015 spin_unlock_irqrestore(&cctx->lock, flags); 2016 2017 if (cctx->fdevice) 2018 misc_deregister(&cctx->fdevice->miscdev); 2019 2020 if (cctx->secure_fdevice) 2021 misc_deregister(&cctx->secure_fdevice->miscdev); 2022 2023 of_platform_depopulate(&rpdev->dev); 2024 2025 cctx->rpdev = NULL; 2026 fastrpc_channel_ctx_put(cctx); 2027 } 2028 2029 static int fastrpc_rpmsg_callback(struct rpmsg_device *rpdev, void *data, 2030 int len, void *priv, u32 addr) 2031 { 2032 struct fastrpc_channel_ctx *cctx = dev_get_drvdata(&rpdev->dev); 2033 struct fastrpc_invoke_rsp *rsp = data; 2034 struct fastrpc_invoke_ctx *ctx; 2035 unsigned long flags; 2036 unsigned long ctxid; 2037 2038 if (len < sizeof(*rsp)) 2039 return -EINVAL; 2040 2041 ctxid = ((rsp->ctx & FASTRPC_CTXID_MASK) >> 4); 2042 2043 spin_lock_irqsave(&cctx->lock, flags); 2044 ctx = idr_find(&cctx->ctx_idr, ctxid); 2045 spin_unlock_irqrestore(&cctx->lock, flags); 2046 2047 if (!ctx) { 2048 dev_err(&rpdev->dev, "No context ID matches response\n"); 2049 return -ENOENT; 2050 } 2051 2052 ctx->retval = rsp->retval; 2053 complete(&ctx->work); 2054 2055 /* 2056 * The DMA buffer associated with the context cannot be freed in 2057 * interrupt context so schedule it through a worker thread to 2058 * avoid a kernel BUG. 2059 */ 2060 schedule_work(&ctx->put_work); 2061 2062 return 0; 2063 } 2064 2065 static const struct of_device_id fastrpc_rpmsg_of_match[] = { 2066 { .compatible = "qcom,fastrpc" }, 2067 { }, 2068 }; 2069 MODULE_DEVICE_TABLE(of, fastrpc_rpmsg_of_match); 2070 2071 static struct rpmsg_driver fastrpc_driver = { 2072 .probe = fastrpc_rpmsg_probe, 2073 .remove = fastrpc_rpmsg_remove, 2074 .callback = fastrpc_rpmsg_callback, 2075 .drv = { 2076 .name = "qcom,fastrpc", 2077 .of_match_table = fastrpc_rpmsg_of_match, 2078 }, 2079 }; 2080 2081 static int fastrpc_init(void) 2082 { 2083 int ret; 2084 2085 ret = platform_driver_register(&fastrpc_cb_driver); 2086 if (ret < 0) { 2087 pr_err("fastrpc: failed to register cb driver\n"); 2088 return ret; 2089 } 2090 2091 ret = register_rpmsg_driver(&fastrpc_driver); 2092 if (ret < 0) { 2093 pr_err("fastrpc: failed to register rpmsg driver\n"); 2094 platform_driver_unregister(&fastrpc_cb_driver); 2095 return ret; 2096 } 2097 2098 return 0; 2099 } 2100 module_init(fastrpc_init); 2101 2102 static void fastrpc_exit(void) 2103 { 2104 platform_driver_unregister(&fastrpc_cb_driver); 2105 unregister_rpmsg_driver(&fastrpc_driver); 2106 } 2107 module_exit(fastrpc_exit); 2108 2109 MODULE_LICENSE("GPL v2"); 2110 MODULE_IMPORT_NS(DMA_BUF); 2111