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 iosys_map *map) 591 { 592 struct fastrpc_buf *buf = dmabuf->priv; 593 594 iosys_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 oix; 723 724 size = ALIGN(metalen, FASTRPC_ALIGN); 725 for (oix = 0; oix < ctx->nbufs; oix++) { 726 int i = ctx->olaps[oix].raix; 727 728 if (ctx->args[i].fd == 0 || ctx->args[i].fd == -1) { 729 730 if (ctx->olaps[oix].offset == 0) 731 size = ALIGN(size, FASTRPC_ALIGN); 732 733 size += (ctx->olaps[oix].mend - ctx->olaps[oix].mstart); 734 } 735 } 736 737 return size; 738 } 739 740 static int fastrpc_create_maps(struct fastrpc_invoke_ctx *ctx) 741 { 742 struct device *dev = ctx->fl->sctx->dev; 743 int i, err; 744 745 for (i = 0; i < ctx->nscalars; ++i) { 746 /* Make sure reserved field is set to 0 */ 747 if (ctx->args[i].reserved) 748 return -EINVAL; 749 750 if (ctx->args[i].fd == 0 || ctx->args[i].fd == -1 || 751 ctx->args[i].length == 0) 752 continue; 753 754 err = fastrpc_map_create(ctx->fl, ctx->args[i].fd, 755 ctx->args[i].length, &ctx->maps[i]); 756 if (err) { 757 dev_err(dev, "Error Creating map %d\n", err); 758 return -EINVAL; 759 } 760 761 } 762 return 0; 763 } 764 765 static int fastrpc_get_args(u32 kernel, struct fastrpc_invoke_ctx *ctx) 766 { 767 struct device *dev = ctx->fl->sctx->dev; 768 struct fastrpc_remote_arg *rpra; 769 struct fastrpc_invoke_buf *list; 770 struct fastrpc_phy_page *pages; 771 int inbufs, i, oix, err = 0; 772 u64 len, rlen, pkt_size; 773 u64 pg_start, pg_end; 774 uintptr_t args; 775 int metalen; 776 777 inbufs = REMOTE_SCALARS_INBUFS(ctx->sc); 778 metalen = fastrpc_get_meta_size(ctx); 779 pkt_size = fastrpc_get_payload_size(ctx, metalen); 780 781 err = fastrpc_create_maps(ctx); 782 if (err) 783 return err; 784 785 ctx->msg_sz = pkt_size; 786 787 err = fastrpc_buf_alloc(ctx->fl, dev, pkt_size, &ctx->buf); 788 if (err) 789 return err; 790 791 rpra = ctx->buf->virt; 792 list = ctx->buf->virt + ctx->nscalars * sizeof(*rpra); 793 pages = ctx->buf->virt + ctx->nscalars * (sizeof(*list) + 794 sizeof(*rpra)); 795 args = (uintptr_t)ctx->buf->virt + metalen; 796 rlen = pkt_size - metalen; 797 ctx->rpra = rpra; 798 799 for (oix = 0; oix < ctx->nbufs; ++oix) { 800 int mlen; 801 802 i = ctx->olaps[oix].raix; 803 len = ctx->args[i].length; 804 805 rpra[i].pv = 0; 806 rpra[i].len = len; 807 list[i].num = len ? 1 : 0; 808 list[i].pgidx = i; 809 810 if (!len) 811 continue; 812 813 if (ctx->maps[i]) { 814 struct vm_area_struct *vma = NULL; 815 816 rpra[i].pv = (u64) ctx->args[i].ptr; 817 pages[i].addr = ctx->maps[i]->phys; 818 819 mmap_read_lock(current->mm); 820 vma = find_vma(current->mm, ctx->args[i].ptr); 821 if (vma) 822 pages[i].addr += ctx->args[i].ptr - 823 vma->vm_start; 824 mmap_read_unlock(current->mm); 825 826 pg_start = (ctx->args[i].ptr & PAGE_MASK) >> PAGE_SHIFT; 827 pg_end = ((ctx->args[i].ptr + len - 1) & PAGE_MASK) >> 828 PAGE_SHIFT; 829 pages[i].size = (pg_end - pg_start + 1) * PAGE_SIZE; 830 831 } else { 832 833 if (ctx->olaps[oix].offset == 0) { 834 rlen -= ALIGN(args, FASTRPC_ALIGN) - args; 835 args = ALIGN(args, FASTRPC_ALIGN); 836 } 837 838 mlen = ctx->olaps[oix].mend - ctx->olaps[oix].mstart; 839 840 if (rlen < mlen) 841 goto bail; 842 843 rpra[i].pv = args - ctx->olaps[oix].offset; 844 pages[i].addr = ctx->buf->phys - 845 ctx->olaps[oix].offset + 846 (pkt_size - rlen); 847 pages[i].addr = pages[i].addr & PAGE_MASK; 848 849 pg_start = (args & PAGE_MASK) >> PAGE_SHIFT; 850 pg_end = ((args + len - 1) & PAGE_MASK) >> PAGE_SHIFT; 851 pages[i].size = (pg_end - pg_start + 1) * PAGE_SIZE; 852 args = args + mlen; 853 rlen -= mlen; 854 } 855 856 if (i < inbufs && !ctx->maps[i]) { 857 void *dst = (void *)(uintptr_t)rpra[i].pv; 858 void *src = (void *)(uintptr_t)ctx->args[i].ptr; 859 860 if (!kernel) { 861 if (copy_from_user(dst, (void __user *)src, 862 len)) { 863 err = -EFAULT; 864 goto bail; 865 } 866 } else { 867 memcpy(dst, src, len); 868 } 869 } 870 } 871 872 for (i = ctx->nbufs; i < ctx->nscalars; ++i) { 873 rpra[i].pv = (u64) ctx->args[i].ptr; 874 rpra[i].len = ctx->args[i].length; 875 list[i].num = ctx->args[i].length ? 1 : 0; 876 list[i].pgidx = i; 877 pages[i].addr = ctx->maps[i]->phys; 878 pages[i].size = ctx->maps[i]->size; 879 } 880 881 bail: 882 if (err) 883 dev_err(dev, "Error: get invoke args failed:%d\n", err); 884 885 return err; 886 } 887 888 static int fastrpc_put_args(struct fastrpc_invoke_ctx *ctx, 889 u32 kernel) 890 { 891 struct fastrpc_remote_arg *rpra = ctx->rpra; 892 int i, inbufs; 893 894 inbufs = REMOTE_SCALARS_INBUFS(ctx->sc); 895 896 for (i = inbufs; i < ctx->nbufs; ++i) { 897 if (!ctx->maps[i]) { 898 void *src = (void *)(uintptr_t)rpra[i].pv; 899 void *dst = (void *)(uintptr_t)ctx->args[i].ptr; 900 u64 len = rpra[i].len; 901 902 if (!kernel) { 903 if (copy_to_user((void __user *)dst, src, len)) 904 return -EFAULT; 905 } else { 906 memcpy(dst, src, len); 907 } 908 } 909 } 910 911 return 0; 912 } 913 914 static int fastrpc_invoke_send(struct fastrpc_session_ctx *sctx, 915 struct fastrpc_invoke_ctx *ctx, 916 u32 kernel, uint32_t handle) 917 { 918 struct fastrpc_channel_ctx *cctx; 919 struct fastrpc_user *fl = ctx->fl; 920 struct fastrpc_msg *msg = &ctx->msg; 921 int ret; 922 923 cctx = fl->cctx; 924 msg->pid = fl->tgid; 925 msg->tid = current->pid; 926 927 if (kernel) 928 msg->pid = 0; 929 930 msg->ctx = ctx->ctxid | fl->pd; 931 msg->handle = handle; 932 msg->sc = ctx->sc; 933 msg->addr = ctx->buf ? ctx->buf->phys : 0; 934 msg->size = roundup(ctx->msg_sz, PAGE_SIZE); 935 fastrpc_context_get(ctx); 936 937 ret = rpmsg_send(cctx->rpdev->ept, (void *)msg, sizeof(*msg)); 938 939 if (ret) 940 fastrpc_context_put(ctx); 941 942 return ret; 943 944 } 945 946 static int fastrpc_internal_invoke(struct fastrpc_user *fl, u32 kernel, 947 u32 handle, u32 sc, 948 struct fastrpc_invoke_args *args) 949 { 950 struct fastrpc_invoke_ctx *ctx = NULL; 951 int err = 0; 952 953 if (!fl->sctx) 954 return -EINVAL; 955 956 if (!fl->cctx->rpdev) 957 return -EPIPE; 958 959 if (handle == FASTRPC_INIT_HANDLE && !kernel) { 960 dev_warn_ratelimited(fl->sctx->dev, "user app trying to send a kernel RPC message (%d)\n", handle); 961 return -EPERM; 962 } 963 964 ctx = fastrpc_context_alloc(fl, kernel, sc, args); 965 if (IS_ERR(ctx)) 966 return PTR_ERR(ctx); 967 968 if (ctx->nscalars) { 969 err = fastrpc_get_args(kernel, ctx); 970 if (err) 971 goto bail; 972 } 973 974 /* make sure that all CPU memory writes are seen by DSP */ 975 dma_wmb(); 976 /* Send invoke buffer to remote dsp */ 977 err = fastrpc_invoke_send(fl->sctx, ctx, kernel, handle); 978 if (err) 979 goto bail; 980 981 if (kernel) { 982 if (!wait_for_completion_timeout(&ctx->work, 10 * HZ)) 983 err = -ETIMEDOUT; 984 } else { 985 err = wait_for_completion_interruptible(&ctx->work); 986 } 987 988 if (err) 989 goto bail; 990 991 /* Check the response from remote dsp */ 992 err = ctx->retval; 993 if (err) 994 goto bail; 995 996 if (ctx->nscalars) { 997 /* make sure that all memory writes by DSP are seen by CPU */ 998 dma_rmb(); 999 /* populate all the output buffers with results */ 1000 err = fastrpc_put_args(ctx, kernel); 1001 if (err) 1002 goto bail; 1003 } 1004 1005 bail: 1006 if (err != -ERESTARTSYS && err != -ETIMEDOUT) { 1007 /* We are done with this compute context */ 1008 spin_lock(&fl->lock); 1009 list_del(&ctx->node); 1010 spin_unlock(&fl->lock); 1011 fastrpc_context_put(ctx); 1012 } 1013 if (err) 1014 dev_dbg(fl->sctx->dev, "Error: Invoke Failed %d\n", err); 1015 1016 return err; 1017 } 1018 1019 static int fastrpc_init_create_process(struct fastrpc_user *fl, 1020 char __user *argp) 1021 { 1022 struct fastrpc_init_create init; 1023 struct fastrpc_invoke_args *args; 1024 struct fastrpc_phy_page pages[1]; 1025 struct fastrpc_map *map = NULL; 1026 struct fastrpc_buf *imem = NULL; 1027 int memlen; 1028 int err; 1029 struct { 1030 int pgid; 1031 u32 namelen; 1032 u32 filelen; 1033 u32 pageslen; 1034 u32 attrs; 1035 u32 siglen; 1036 } inbuf; 1037 u32 sc; 1038 1039 args = kcalloc(FASTRPC_CREATE_PROCESS_NARGS, sizeof(*args), GFP_KERNEL); 1040 if (!args) 1041 return -ENOMEM; 1042 1043 if (copy_from_user(&init, argp, sizeof(init))) { 1044 err = -EFAULT; 1045 goto err; 1046 } 1047 1048 if (init.filelen > INIT_FILELEN_MAX) { 1049 err = -EINVAL; 1050 goto err; 1051 } 1052 1053 inbuf.pgid = fl->tgid; 1054 inbuf.namelen = strlen(current->comm) + 1; 1055 inbuf.filelen = init.filelen; 1056 inbuf.pageslen = 1; 1057 inbuf.attrs = init.attrs; 1058 inbuf.siglen = init.siglen; 1059 fl->pd = USER_PD; 1060 1061 if (init.filelen && init.filefd) { 1062 err = fastrpc_map_create(fl, init.filefd, init.filelen, &map); 1063 if (err) 1064 goto err; 1065 } 1066 1067 memlen = ALIGN(max(INIT_FILELEN_MAX, (int)init.filelen * 4), 1068 1024 * 1024); 1069 err = fastrpc_buf_alloc(fl, fl->sctx->dev, memlen, 1070 &imem); 1071 if (err) 1072 goto err_alloc; 1073 1074 fl->init_mem = imem; 1075 args[0].ptr = (u64)(uintptr_t)&inbuf; 1076 args[0].length = sizeof(inbuf); 1077 args[0].fd = -1; 1078 1079 args[1].ptr = (u64)(uintptr_t)current->comm; 1080 args[1].length = inbuf.namelen; 1081 args[1].fd = -1; 1082 1083 args[2].ptr = (u64) init.file; 1084 args[2].length = inbuf.filelen; 1085 args[2].fd = init.filefd; 1086 1087 pages[0].addr = imem->phys; 1088 pages[0].size = imem->size; 1089 1090 args[3].ptr = (u64)(uintptr_t) pages; 1091 args[3].length = 1 * sizeof(*pages); 1092 args[3].fd = -1; 1093 1094 args[4].ptr = (u64)(uintptr_t)&inbuf.attrs; 1095 args[4].length = sizeof(inbuf.attrs); 1096 args[4].fd = -1; 1097 1098 args[5].ptr = (u64)(uintptr_t) &inbuf.siglen; 1099 args[5].length = sizeof(inbuf.siglen); 1100 args[5].fd = -1; 1101 1102 sc = FASTRPC_SCALARS(FASTRPC_RMID_INIT_CREATE, 4, 0); 1103 if (init.attrs) 1104 sc = FASTRPC_SCALARS(FASTRPC_RMID_INIT_CREATE_ATTR, 6, 0); 1105 1106 err = fastrpc_internal_invoke(fl, true, FASTRPC_INIT_HANDLE, 1107 sc, args); 1108 if (err) 1109 goto err_invoke; 1110 1111 kfree(args); 1112 1113 return 0; 1114 1115 err_invoke: 1116 fl->init_mem = NULL; 1117 fastrpc_buf_free(imem); 1118 err_alloc: 1119 if (map) { 1120 spin_lock(&fl->lock); 1121 list_del(&map->node); 1122 spin_unlock(&fl->lock); 1123 fastrpc_map_put(map); 1124 } 1125 err: 1126 kfree(args); 1127 1128 return err; 1129 } 1130 1131 static struct fastrpc_session_ctx *fastrpc_session_alloc( 1132 struct fastrpc_channel_ctx *cctx) 1133 { 1134 struct fastrpc_session_ctx *session = NULL; 1135 unsigned long flags; 1136 int i; 1137 1138 spin_lock_irqsave(&cctx->lock, flags); 1139 for (i = 0; i < cctx->sesscount; i++) { 1140 if (!cctx->session[i].used && cctx->session[i].valid) { 1141 cctx->session[i].used = true; 1142 session = &cctx->session[i]; 1143 break; 1144 } 1145 } 1146 spin_unlock_irqrestore(&cctx->lock, flags); 1147 1148 return session; 1149 } 1150 1151 static void fastrpc_session_free(struct fastrpc_channel_ctx *cctx, 1152 struct fastrpc_session_ctx *session) 1153 { 1154 unsigned long flags; 1155 1156 spin_lock_irqsave(&cctx->lock, flags); 1157 session->used = false; 1158 spin_unlock_irqrestore(&cctx->lock, flags); 1159 } 1160 1161 static int fastrpc_release_current_dsp_process(struct fastrpc_user *fl) 1162 { 1163 struct fastrpc_invoke_args args[1]; 1164 int tgid = 0; 1165 u32 sc; 1166 1167 tgid = fl->tgid; 1168 args[0].ptr = (u64)(uintptr_t) &tgid; 1169 args[0].length = sizeof(tgid); 1170 args[0].fd = -1; 1171 args[0].reserved = 0; 1172 sc = FASTRPC_SCALARS(FASTRPC_RMID_INIT_RELEASE, 1, 0); 1173 1174 return fastrpc_internal_invoke(fl, true, FASTRPC_INIT_HANDLE, 1175 sc, &args[0]); 1176 } 1177 1178 static int fastrpc_device_release(struct inode *inode, struct file *file) 1179 { 1180 struct fastrpc_user *fl = (struct fastrpc_user *)file->private_data; 1181 struct fastrpc_channel_ctx *cctx = fl->cctx; 1182 struct fastrpc_invoke_ctx *ctx, *n; 1183 struct fastrpc_map *map, *m; 1184 struct fastrpc_buf *buf, *b; 1185 unsigned long flags; 1186 1187 fastrpc_release_current_dsp_process(fl); 1188 1189 spin_lock_irqsave(&cctx->lock, flags); 1190 list_del(&fl->user); 1191 spin_unlock_irqrestore(&cctx->lock, flags); 1192 1193 if (fl->init_mem) 1194 fastrpc_buf_free(fl->init_mem); 1195 1196 list_for_each_entry_safe(ctx, n, &fl->pending, node) { 1197 list_del(&ctx->node); 1198 fastrpc_context_put(ctx); 1199 } 1200 1201 list_for_each_entry_safe(map, m, &fl->maps, node) { 1202 list_del(&map->node); 1203 fastrpc_map_put(map); 1204 } 1205 1206 list_for_each_entry_safe(buf, b, &fl->mmaps, node) { 1207 list_del(&buf->node); 1208 fastrpc_buf_free(buf); 1209 } 1210 1211 fastrpc_session_free(cctx, fl->sctx); 1212 fastrpc_channel_ctx_put(cctx); 1213 1214 mutex_destroy(&fl->mutex); 1215 kfree(fl); 1216 file->private_data = NULL; 1217 1218 return 0; 1219 } 1220 1221 static int fastrpc_device_open(struct inode *inode, struct file *filp) 1222 { 1223 struct fastrpc_channel_ctx *cctx = miscdev_to_cctx(filp->private_data); 1224 struct fastrpc_user *fl = NULL; 1225 unsigned long flags; 1226 1227 fl = kzalloc(sizeof(*fl), GFP_KERNEL); 1228 if (!fl) 1229 return -ENOMEM; 1230 1231 /* Released in fastrpc_device_release() */ 1232 fastrpc_channel_ctx_get(cctx); 1233 1234 filp->private_data = fl; 1235 spin_lock_init(&fl->lock); 1236 mutex_init(&fl->mutex); 1237 INIT_LIST_HEAD(&fl->pending); 1238 INIT_LIST_HEAD(&fl->maps); 1239 INIT_LIST_HEAD(&fl->mmaps); 1240 INIT_LIST_HEAD(&fl->user); 1241 fl->tgid = current->tgid; 1242 fl->cctx = cctx; 1243 1244 fl->sctx = fastrpc_session_alloc(cctx); 1245 if (!fl->sctx) { 1246 dev_err(&cctx->rpdev->dev, "No session available\n"); 1247 mutex_destroy(&fl->mutex); 1248 kfree(fl); 1249 1250 return -EBUSY; 1251 } 1252 1253 spin_lock_irqsave(&cctx->lock, flags); 1254 list_add_tail(&fl->user, &cctx->users); 1255 spin_unlock_irqrestore(&cctx->lock, flags); 1256 1257 return 0; 1258 } 1259 1260 static int fastrpc_dmabuf_alloc(struct fastrpc_user *fl, char __user *argp) 1261 { 1262 struct fastrpc_alloc_dma_buf bp; 1263 DEFINE_DMA_BUF_EXPORT_INFO(exp_info); 1264 struct fastrpc_buf *buf = NULL; 1265 int err; 1266 1267 if (copy_from_user(&bp, argp, sizeof(bp))) 1268 return -EFAULT; 1269 1270 err = fastrpc_buf_alloc(fl, fl->sctx->dev, bp.size, &buf); 1271 if (err) 1272 return err; 1273 exp_info.ops = &fastrpc_dma_buf_ops; 1274 exp_info.size = bp.size; 1275 exp_info.flags = O_RDWR; 1276 exp_info.priv = buf; 1277 buf->dmabuf = dma_buf_export(&exp_info); 1278 if (IS_ERR(buf->dmabuf)) { 1279 err = PTR_ERR(buf->dmabuf); 1280 fastrpc_buf_free(buf); 1281 return err; 1282 } 1283 1284 bp.fd = dma_buf_fd(buf->dmabuf, O_ACCMODE); 1285 if (bp.fd < 0) { 1286 dma_buf_put(buf->dmabuf); 1287 return -EINVAL; 1288 } 1289 1290 if (copy_to_user(argp, &bp, sizeof(bp))) { 1291 /* 1292 * The usercopy failed, but we can't do much about it, as 1293 * dma_buf_fd() already called fd_install() and made the 1294 * file descriptor accessible for the current process. It 1295 * might already be closed and dmabuf no longer valid when 1296 * we reach this point. Therefore "leak" the fd and rely on 1297 * the process exit path to do any required cleanup. 1298 */ 1299 return -EFAULT; 1300 } 1301 1302 return 0; 1303 } 1304 1305 static int fastrpc_init_attach(struct fastrpc_user *fl, int pd) 1306 { 1307 struct fastrpc_invoke_args args[1]; 1308 int tgid = fl->tgid; 1309 u32 sc; 1310 1311 args[0].ptr = (u64)(uintptr_t) &tgid; 1312 args[0].length = sizeof(tgid); 1313 args[0].fd = -1; 1314 args[0].reserved = 0; 1315 sc = FASTRPC_SCALARS(FASTRPC_RMID_INIT_ATTACH, 1, 0); 1316 fl->pd = pd; 1317 1318 return fastrpc_internal_invoke(fl, true, FASTRPC_INIT_HANDLE, 1319 sc, &args[0]); 1320 } 1321 1322 static int fastrpc_invoke(struct fastrpc_user *fl, char __user *argp) 1323 { 1324 struct fastrpc_invoke_args *args = NULL; 1325 struct fastrpc_invoke inv; 1326 u32 nscalars; 1327 int err; 1328 1329 if (copy_from_user(&inv, argp, sizeof(inv))) 1330 return -EFAULT; 1331 1332 /* nscalars is truncated here to max supported value */ 1333 nscalars = REMOTE_SCALARS_LENGTH(inv.sc); 1334 if (nscalars) { 1335 args = kcalloc(nscalars, sizeof(*args), GFP_KERNEL); 1336 if (!args) 1337 return -ENOMEM; 1338 1339 if (copy_from_user(args, (void __user *)(uintptr_t)inv.args, 1340 nscalars * sizeof(*args))) { 1341 kfree(args); 1342 return -EFAULT; 1343 } 1344 } 1345 1346 err = fastrpc_internal_invoke(fl, false, inv.handle, inv.sc, args); 1347 kfree(args); 1348 1349 return err; 1350 } 1351 1352 static int fastrpc_req_munmap_impl(struct fastrpc_user *fl, 1353 struct fastrpc_req_munmap *req) 1354 { 1355 struct fastrpc_invoke_args args[1] = { [0] = { 0 } }; 1356 struct fastrpc_buf *buf, *b; 1357 struct fastrpc_munmap_req_msg req_msg; 1358 struct device *dev = fl->sctx->dev; 1359 int err; 1360 u32 sc; 1361 1362 spin_lock(&fl->lock); 1363 list_for_each_entry_safe(buf, b, &fl->mmaps, node) { 1364 if ((buf->raddr == req->vaddrout) && (buf->size == req->size)) 1365 break; 1366 buf = NULL; 1367 } 1368 spin_unlock(&fl->lock); 1369 1370 if (!buf) { 1371 dev_err(dev, "mmap not in list\n"); 1372 return -EINVAL; 1373 } 1374 1375 req_msg.pgid = fl->tgid; 1376 req_msg.size = buf->size; 1377 req_msg.vaddr = buf->raddr; 1378 1379 args[0].ptr = (u64) (uintptr_t) &req_msg; 1380 args[0].length = sizeof(req_msg); 1381 1382 sc = FASTRPC_SCALARS(FASTRPC_RMID_INIT_MUNMAP, 1, 0); 1383 err = fastrpc_internal_invoke(fl, true, FASTRPC_INIT_HANDLE, sc, 1384 &args[0]); 1385 if (!err) { 1386 dev_dbg(dev, "unmmap\tpt 0x%09lx OK\n", buf->raddr); 1387 spin_lock(&fl->lock); 1388 list_del(&buf->node); 1389 spin_unlock(&fl->lock); 1390 fastrpc_buf_free(buf); 1391 } else { 1392 dev_err(dev, "unmmap\tpt 0x%09lx ERROR\n", buf->raddr); 1393 } 1394 1395 return err; 1396 } 1397 1398 static int fastrpc_req_munmap(struct fastrpc_user *fl, char __user *argp) 1399 { 1400 struct fastrpc_req_munmap req; 1401 1402 if (copy_from_user(&req, argp, sizeof(req))) 1403 return -EFAULT; 1404 1405 return fastrpc_req_munmap_impl(fl, &req); 1406 } 1407 1408 static int fastrpc_req_mmap(struct fastrpc_user *fl, char __user *argp) 1409 { 1410 struct fastrpc_invoke_args args[3] = { [0 ... 2] = { 0 } }; 1411 struct fastrpc_buf *buf = NULL; 1412 struct fastrpc_mmap_req_msg req_msg; 1413 struct fastrpc_mmap_rsp_msg rsp_msg; 1414 struct fastrpc_req_munmap req_unmap; 1415 struct fastrpc_phy_page pages; 1416 struct fastrpc_req_mmap req; 1417 struct device *dev = fl->sctx->dev; 1418 int err; 1419 u32 sc; 1420 1421 if (copy_from_user(&req, argp, sizeof(req))) 1422 return -EFAULT; 1423 1424 if (req.flags != ADSP_MMAP_ADD_PAGES) { 1425 dev_err(dev, "flag not supported 0x%x\n", req.flags); 1426 return -EINVAL; 1427 } 1428 1429 if (req.vaddrin) { 1430 dev_err(dev, "adding user allocated pages is not supported\n"); 1431 return -EINVAL; 1432 } 1433 1434 err = fastrpc_buf_alloc(fl, fl->sctx->dev, req.size, &buf); 1435 if (err) { 1436 dev_err(dev, "failed to allocate buffer\n"); 1437 return err; 1438 } 1439 1440 req_msg.pgid = fl->tgid; 1441 req_msg.flags = req.flags; 1442 req_msg.vaddr = req.vaddrin; 1443 req_msg.num = sizeof(pages); 1444 1445 args[0].ptr = (u64) (uintptr_t) &req_msg; 1446 args[0].length = sizeof(req_msg); 1447 1448 pages.addr = buf->phys; 1449 pages.size = buf->size; 1450 1451 args[1].ptr = (u64) (uintptr_t) &pages; 1452 args[1].length = sizeof(pages); 1453 1454 args[2].ptr = (u64) (uintptr_t) &rsp_msg; 1455 args[2].length = sizeof(rsp_msg); 1456 1457 sc = FASTRPC_SCALARS(FASTRPC_RMID_INIT_MMAP, 2, 1); 1458 err = fastrpc_internal_invoke(fl, true, FASTRPC_INIT_HANDLE, sc, 1459 &args[0]); 1460 if (err) { 1461 dev_err(dev, "mmap error (len 0x%08llx)\n", buf->size); 1462 goto err_invoke; 1463 } 1464 1465 /* update the buffer to be able to deallocate the memory on the DSP */ 1466 buf->raddr = (uintptr_t) rsp_msg.vaddr; 1467 1468 /* let the client know the address to use */ 1469 req.vaddrout = rsp_msg.vaddr; 1470 1471 spin_lock(&fl->lock); 1472 list_add_tail(&buf->node, &fl->mmaps); 1473 spin_unlock(&fl->lock); 1474 1475 if (copy_to_user((void __user *)argp, &req, sizeof(req))) { 1476 /* unmap the memory and release the buffer */ 1477 req_unmap.vaddrout = buf->raddr; 1478 req_unmap.size = buf->size; 1479 fastrpc_req_munmap_impl(fl, &req_unmap); 1480 return -EFAULT; 1481 } 1482 1483 dev_dbg(dev, "mmap\t\tpt 0x%09lx OK [len 0x%08llx]\n", 1484 buf->raddr, buf->size); 1485 1486 return 0; 1487 1488 err_invoke: 1489 fastrpc_buf_free(buf); 1490 1491 return err; 1492 } 1493 1494 static long fastrpc_device_ioctl(struct file *file, unsigned int cmd, 1495 unsigned long arg) 1496 { 1497 struct fastrpc_user *fl = (struct fastrpc_user *)file->private_data; 1498 char __user *argp = (char __user *)arg; 1499 int err; 1500 1501 switch (cmd) { 1502 case FASTRPC_IOCTL_INVOKE: 1503 err = fastrpc_invoke(fl, argp); 1504 break; 1505 case FASTRPC_IOCTL_INIT_ATTACH: 1506 err = fastrpc_init_attach(fl, AUDIO_PD); 1507 break; 1508 case FASTRPC_IOCTL_INIT_ATTACH_SNS: 1509 err = fastrpc_init_attach(fl, SENSORS_PD); 1510 break; 1511 case FASTRPC_IOCTL_INIT_CREATE: 1512 err = fastrpc_init_create_process(fl, argp); 1513 break; 1514 case FASTRPC_IOCTL_ALLOC_DMA_BUFF: 1515 err = fastrpc_dmabuf_alloc(fl, argp); 1516 break; 1517 case FASTRPC_IOCTL_MMAP: 1518 err = fastrpc_req_mmap(fl, argp); 1519 break; 1520 case FASTRPC_IOCTL_MUNMAP: 1521 err = fastrpc_req_munmap(fl, argp); 1522 break; 1523 default: 1524 err = -ENOTTY; 1525 break; 1526 } 1527 1528 return err; 1529 } 1530 1531 static const struct file_operations fastrpc_fops = { 1532 .open = fastrpc_device_open, 1533 .release = fastrpc_device_release, 1534 .unlocked_ioctl = fastrpc_device_ioctl, 1535 .compat_ioctl = fastrpc_device_ioctl, 1536 }; 1537 1538 static int fastrpc_cb_probe(struct platform_device *pdev) 1539 { 1540 struct fastrpc_channel_ctx *cctx; 1541 struct fastrpc_session_ctx *sess; 1542 struct device *dev = &pdev->dev; 1543 int i, sessions = 0; 1544 unsigned long flags; 1545 int rc; 1546 1547 cctx = dev_get_drvdata(dev->parent); 1548 if (!cctx) 1549 return -EINVAL; 1550 1551 of_property_read_u32(dev->of_node, "qcom,nsessions", &sessions); 1552 1553 spin_lock_irqsave(&cctx->lock, flags); 1554 sess = &cctx->session[cctx->sesscount]; 1555 sess->used = false; 1556 sess->valid = true; 1557 sess->dev = dev; 1558 dev_set_drvdata(dev, sess); 1559 1560 if (of_property_read_u32(dev->of_node, "reg", &sess->sid)) 1561 dev_info(dev, "FastRPC Session ID not specified in DT\n"); 1562 1563 if (sessions > 0) { 1564 struct fastrpc_session_ctx *dup_sess; 1565 1566 for (i = 1; i < sessions; i++) { 1567 if (cctx->sesscount++ >= FASTRPC_MAX_SESSIONS) 1568 break; 1569 dup_sess = &cctx->session[cctx->sesscount]; 1570 memcpy(dup_sess, sess, sizeof(*dup_sess)); 1571 } 1572 } 1573 cctx->sesscount++; 1574 spin_unlock_irqrestore(&cctx->lock, flags); 1575 rc = dma_set_mask(dev, DMA_BIT_MASK(32)); 1576 if (rc) { 1577 dev_err(dev, "32-bit DMA enable failed\n"); 1578 return rc; 1579 } 1580 1581 return 0; 1582 } 1583 1584 static int fastrpc_cb_remove(struct platform_device *pdev) 1585 { 1586 struct fastrpc_channel_ctx *cctx = dev_get_drvdata(pdev->dev.parent); 1587 struct fastrpc_session_ctx *sess = dev_get_drvdata(&pdev->dev); 1588 unsigned long flags; 1589 int i; 1590 1591 spin_lock_irqsave(&cctx->lock, flags); 1592 for (i = 1; i < FASTRPC_MAX_SESSIONS; i++) { 1593 if (cctx->session[i].sid == sess->sid) { 1594 cctx->session[i].valid = false; 1595 cctx->sesscount--; 1596 } 1597 } 1598 spin_unlock_irqrestore(&cctx->lock, flags); 1599 1600 return 0; 1601 } 1602 1603 static const struct of_device_id fastrpc_match_table[] = { 1604 { .compatible = "qcom,fastrpc-compute-cb", }, 1605 {} 1606 }; 1607 1608 static struct platform_driver fastrpc_cb_driver = { 1609 .probe = fastrpc_cb_probe, 1610 .remove = fastrpc_cb_remove, 1611 .driver = { 1612 .name = "qcom,fastrpc-cb", 1613 .of_match_table = fastrpc_match_table, 1614 .suppress_bind_attrs = true, 1615 }, 1616 }; 1617 1618 static int fastrpc_rpmsg_probe(struct rpmsg_device *rpdev) 1619 { 1620 struct device *rdev = &rpdev->dev; 1621 struct fastrpc_channel_ctx *data; 1622 int i, err, domain_id = -1; 1623 const char *domain; 1624 1625 err = of_property_read_string(rdev->of_node, "label", &domain); 1626 if (err) { 1627 dev_info(rdev, "FastRPC Domain not specified in DT\n"); 1628 return err; 1629 } 1630 1631 for (i = 0; i <= CDSP_DOMAIN_ID; i++) { 1632 if (!strcmp(domains[i], domain)) { 1633 domain_id = i; 1634 break; 1635 } 1636 } 1637 1638 if (domain_id < 0) { 1639 dev_info(rdev, "FastRPC Invalid Domain ID %d\n", domain_id); 1640 return -EINVAL; 1641 } 1642 1643 data = kzalloc(sizeof(*data), GFP_KERNEL); 1644 if (!data) 1645 return -ENOMEM; 1646 1647 data->miscdev.minor = MISC_DYNAMIC_MINOR; 1648 data->miscdev.name = devm_kasprintf(rdev, GFP_KERNEL, "fastrpc-%s", 1649 domains[domain_id]); 1650 data->miscdev.fops = &fastrpc_fops; 1651 err = misc_register(&data->miscdev); 1652 if (err) { 1653 kfree(data); 1654 return err; 1655 } 1656 1657 kref_init(&data->refcount); 1658 1659 dev_set_drvdata(&rpdev->dev, data); 1660 dma_set_mask_and_coherent(rdev, DMA_BIT_MASK(32)); 1661 INIT_LIST_HEAD(&data->users); 1662 spin_lock_init(&data->lock); 1663 idr_init(&data->ctx_idr); 1664 data->domain_id = domain_id; 1665 data->rpdev = rpdev; 1666 1667 return of_platform_populate(rdev->of_node, NULL, NULL, rdev); 1668 } 1669 1670 static void fastrpc_notify_users(struct fastrpc_user *user) 1671 { 1672 struct fastrpc_invoke_ctx *ctx; 1673 1674 spin_lock(&user->lock); 1675 list_for_each_entry(ctx, &user->pending, node) 1676 complete(&ctx->work); 1677 spin_unlock(&user->lock); 1678 } 1679 1680 static void fastrpc_rpmsg_remove(struct rpmsg_device *rpdev) 1681 { 1682 struct fastrpc_channel_ctx *cctx = dev_get_drvdata(&rpdev->dev); 1683 struct fastrpc_user *user; 1684 unsigned long flags; 1685 1686 spin_lock_irqsave(&cctx->lock, flags); 1687 list_for_each_entry(user, &cctx->users, user) 1688 fastrpc_notify_users(user); 1689 spin_unlock_irqrestore(&cctx->lock, flags); 1690 1691 misc_deregister(&cctx->miscdev); 1692 of_platform_depopulate(&rpdev->dev); 1693 1694 cctx->rpdev = NULL; 1695 fastrpc_channel_ctx_put(cctx); 1696 } 1697 1698 static int fastrpc_rpmsg_callback(struct rpmsg_device *rpdev, void *data, 1699 int len, void *priv, u32 addr) 1700 { 1701 struct fastrpc_channel_ctx *cctx = dev_get_drvdata(&rpdev->dev); 1702 struct fastrpc_invoke_rsp *rsp = data; 1703 struct fastrpc_invoke_ctx *ctx; 1704 unsigned long flags; 1705 unsigned long ctxid; 1706 1707 if (len < sizeof(*rsp)) 1708 return -EINVAL; 1709 1710 ctxid = ((rsp->ctx & FASTRPC_CTXID_MASK) >> 4); 1711 1712 spin_lock_irqsave(&cctx->lock, flags); 1713 ctx = idr_find(&cctx->ctx_idr, ctxid); 1714 spin_unlock_irqrestore(&cctx->lock, flags); 1715 1716 if (!ctx) { 1717 dev_err(&rpdev->dev, "No context ID matches response\n"); 1718 return -ENOENT; 1719 } 1720 1721 ctx->retval = rsp->retval; 1722 complete(&ctx->work); 1723 1724 /* 1725 * The DMA buffer associated with the context cannot be freed in 1726 * interrupt context so schedule it through a worker thread to 1727 * avoid a kernel BUG. 1728 */ 1729 schedule_work(&ctx->put_work); 1730 1731 return 0; 1732 } 1733 1734 static const struct of_device_id fastrpc_rpmsg_of_match[] = { 1735 { .compatible = "qcom,fastrpc" }, 1736 { }, 1737 }; 1738 MODULE_DEVICE_TABLE(of, fastrpc_rpmsg_of_match); 1739 1740 static struct rpmsg_driver fastrpc_driver = { 1741 .probe = fastrpc_rpmsg_probe, 1742 .remove = fastrpc_rpmsg_remove, 1743 .callback = fastrpc_rpmsg_callback, 1744 .drv = { 1745 .name = "qcom,fastrpc", 1746 .of_match_table = fastrpc_rpmsg_of_match, 1747 }, 1748 }; 1749 1750 static int fastrpc_init(void) 1751 { 1752 int ret; 1753 1754 ret = platform_driver_register(&fastrpc_cb_driver); 1755 if (ret < 0) { 1756 pr_err("fastrpc: failed to register cb driver\n"); 1757 return ret; 1758 } 1759 1760 ret = register_rpmsg_driver(&fastrpc_driver); 1761 if (ret < 0) { 1762 pr_err("fastrpc: failed to register rpmsg driver\n"); 1763 platform_driver_unregister(&fastrpc_cb_driver); 1764 return ret; 1765 } 1766 1767 return 0; 1768 } 1769 module_init(fastrpc_init); 1770 1771 static void fastrpc_exit(void) 1772 { 1773 platform_driver_unregister(&fastrpc_cb_driver); 1774 unregister_rpmsg_driver(&fastrpc_driver); 1775 } 1776 module_exit(fastrpc_exit); 1777 1778 MODULE_LICENSE("GPL v2"); 1779 MODULE_IMPORT_NS(DMA_BUF); 1780