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