1 // SPDX-License-Identifier: GPL-2.0 2 // Copyright (c) 2011-2018, The Linux Foundation. All rights reserved. 3 // Copyright (c) 2018, Linaro Limited 4 5 #include <linux/completion.h> 6 #include <linux/device.h> 7 #include <linux/dma-buf.h> 8 #include <linux/dma-mapping.h> 9 #include <linux/idr.h> 10 #include <linux/list.h> 11 #include <linux/miscdevice.h> 12 #include <linux/module.h> 13 #include <linux/of_address.h> 14 #include <linux/of.h> 15 #include <linux/sort.h> 16 #include <linux/of_platform.h> 17 #include <linux/rpmsg.h> 18 #include <linux/scatterlist.h> 19 #include <linux/slab.h> 20 #include <uapi/misc/fastrpc.h> 21 22 #define ADSP_DOMAIN_ID (0) 23 #define MDSP_DOMAIN_ID (1) 24 #define SDSP_DOMAIN_ID (2) 25 #define CDSP_DOMAIN_ID (3) 26 #define FASTRPC_DEV_MAX 4 /* adsp, mdsp, slpi, cdsp*/ 27 #define FASTRPC_MAX_SESSIONS 9 /*8 compute, 1 cpz*/ 28 #define FASTRPC_ALIGN 128 29 #define FASTRPC_MAX_FDLIST 16 30 #define FASTRPC_MAX_CRCLIST 64 31 #define FASTRPC_PHYS(p) ((p) & 0xffffffff) 32 #define FASTRPC_CTX_MAX (256) 33 #define FASTRPC_INIT_HANDLE 1 34 #define FASTRPC_CTXID_MASK (0xFF0) 35 #define INIT_FILELEN_MAX (64 * 1024 * 1024) 36 #define FASTRPC_DEVICE_NAME "fastrpc" 37 38 /* Retrives number of input buffers from the scalars parameter */ 39 #define REMOTE_SCALARS_INBUFS(sc) (((sc) >> 16) & 0x0ff) 40 41 /* Retrives number of output buffers from the scalars parameter */ 42 #define REMOTE_SCALARS_OUTBUFS(sc) (((sc) >> 8) & 0x0ff) 43 44 /* Retrives number of input handles from the scalars parameter */ 45 #define REMOTE_SCALARS_INHANDLES(sc) (((sc) >> 4) & 0x0f) 46 47 /* Retrives number of output handles from the scalars parameter */ 48 #define REMOTE_SCALARS_OUTHANDLES(sc) ((sc) & 0x0f) 49 50 #define REMOTE_SCALARS_LENGTH(sc) (REMOTE_SCALARS_INBUFS(sc) + \ 51 REMOTE_SCALARS_OUTBUFS(sc) + \ 52 REMOTE_SCALARS_INHANDLES(sc)+ \ 53 REMOTE_SCALARS_OUTHANDLES(sc)) 54 #define FASTRPC_BUILD_SCALARS(attr, method, in, out, oin, oout) \ 55 (((attr & 0x07) << 29) | \ 56 ((method & 0x1f) << 24) | \ 57 ((in & 0xff) << 16) | \ 58 ((out & 0xff) << 8) | \ 59 ((oin & 0x0f) << 4) | \ 60 (oout & 0x0f)) 61 62 #define FASTRPC_SCALARS(method, in, out) \ 63 FASTRPC_BUILD_SCALARS(0, method, in, out, 0, 0) 64 65 #define FASTRPC_CREATE_PROCESS_NARGS 6 66 /* Remote Method id table */ 67 #define FASTRPC_RMID_INIT_ATTACH 0 68 #define FASTRPC_RMID_INIT_RELEASE 1 69 #define FASTRPC_RMID_INIT_CREATE 6 70 #define FASTRPC_RMID_INIT_CREATE_ATTR 7 71 #define FASTRPC_RMID_INIT_CREATE_STATIC 8 72 73 #define miscdev_to_cctx(d) container_of(d, struct fastrpc_channel_ctx, miscdev) 74 75 static const char *domains[FASTRPC_DEV_MAX] = { "adsp", "mdsp", 76 "sdsp", "cdsp"}; 77 struct fastrpc_phy_page { 78 u64 addr; /* physical address */ 79 u64 size; /* size of contiguous region */ 80 }; 81 82 struct fastrpc_invoke_buf { 83 u32 num; /* number of contiguous regions */ 84 u32 pgidx; /* index to start of contiguous region */ 85 }; 86 87 struct fastrpc_remote_arg { 88 u64 pv; 89 u64 len; 90 }; 91 92 struct fastrpc_msg { 93 int pid; /* process group id */ 94 int tid; /* thread id */ 95 u64 ctx; /* invoke caller context */ 96 u32 handle; /* handle to invoke */ 97 u32 sc; /* scalars structure describing the data */ 98 u64 addr; /* physical address */ 99 u64 size; /* size of contiguous region */ 100 }; 101 102 struct fastrpc_invoke_rsp { 103 u64 ctx; /* invoke caller context */ 104 int retval; /* invoke return value */ 105 }; 106 107 struct fastrpc_buf_overlap { 108 u64 start; 109 u64 end; 110 int raix; 111 u64 mstart; 112 u64 mend; 113 u64 offset; 114 }; 115 116 struct fastrpc_buf { 117 struct fastrpc_user *fl; 118 struct dma_buf *dmabuf; 119 struct device *dev; 120 void *virt; 121 u64 phys; 122 u64 size; 123 /* Lock for dma buf attachments */ 124 struct mutex lock; 125 struct list_head attachments; 126 }; 127 128 struct fastrpc_dma_buf_attachment { 129 struct device *dev; 130 struct sg_table sgt; 131 struct list_head node; 132 }; 133 134 struct fastrpc_map { 135 struct list_head node; 136 struct fastrpc_user *fl; 137 int fd; 138 struct dma_buf *buf; 139 struct sg_table *table; 140 struct dma_buf_attachment *attach; 141 u64 phys; 142 u64 size; 143 void *va; 144 u64 len; 145 struct kref refcount; 146 }; 147 148 struct fastrpc_invoke_ctx { 149 int nscalars; 150 int nbufs; 151 int retval; 152 int pid; 153 int tgid; 154 u32 sc; 155 u32 *crc; 156 u64 ctxid; 157 u64 msg_sz; 158 struct kref refcount; 159 struct list_head node; /* list of ctxs */ 160 struct completion work; 161 struct work_struct put_work; 162 struct fastrpc_msg msg; 163 struct fastrpc_user *fl; 164 struct fastrpc_remote_arg *rpra; 165 struct fastrpc_map **maps; 166 struct fastrpc_buf *buf; 167 struct fastrpc_invoke_args *args; 168 struct fastrpc_buf_overlap *olaps; 169 struct fastrpc_channel_ctx *cctx; 170 }; 171 172 struct fastrpc_session_ctx { 173 struct device *dev; 174 int sid; 175 bool used; 176 bool valid; 177 }; 178 179 struct fastrpc_channel_ctx { 180 int domain_id; 181 int sesscount; 182 struct rpmsg_device *rpdev; 183 struct fastrpc_session_ctx session[FASTRPC_MAX_SESSIONS]; 184 spinlock_t lock; 185 struct idr ctx_idr; 186 struct list_head users; 187 struct miscdevice miscdev; 188 struct kref refcount; 189 }; 190 191 struct fastrpc_user { 192 struct list_head user; 193 struct list_head maps; 194 struct list_head pending; 195 196 struct fastrpc_channel_ctx *cctx; 197 struct fastrpc_session_ctx *sctx; 198 struct fastrpc_buf *init_mem; 199 200 int tgid; 201 int pd; 202 /* Lock for lists */ 203 spinlock_t lock; 204 /* lock for allocations */ 205 struct mutex mutex; 206 }; 207 208 static void fastrpc_free_map(struct kref *ref) 209 { 210 struct fastrpc_map *map; 211 212 map = container_of(ref, struct fastrpc_map, refcount); 213 214 if (map->table) { 215 dma_buf_unmap_attachment(map->attach, map->table, 216 DMA_BIDIRECTIONAL); 217 dma_buf_detach(map->buf, map->attach); 218 dma_buf_put(map->buf); 219 } 220 221 kfree(map); 222 } 223 224 static void fastrpc_map_put(struct fastrpc_map *map) 225 { 226 if (map) 227 kref_put(&map->refcount, fastrpc_free_map); 228 } 229 230 static void fastrpc_map_get(struct fastrpc_map *map) 231 { 232 if (map) 233 kref_get(&map->refcount); 234 } 235 236 static int fastrpc_map_find(struct fastrpc_user *fl, int fd, 237 struct fastrpc_map **ppmap) 238 { 239 struct fastrpc_map *map = NULL; 240 241 mutex_lock(&fl->mutex); 242 list_for_each_entry(map, &fl->maps, node) { 243 if (map->fd == fd) { 244 fastrpc_map_get(map); 245 *ppmap = map; 246 mutex_unlock(&fl->mutex); 247 return 0; 248 } 249 } 250 mutex_unlock(&fl->mutex); 251 252 return -ENOENT; 253 } 254 255 static void fastrpc_buf_free(struct fastrpc_buf *buf) 256 { 257 dma_free_coherent(buf->dev, buf->size, buf->virt, 258 FASTRPC_PHYS(buf->phys)); 259 kfree(buf); 260 } 261 262 static int fastrpc_buf_alloc(struct fastrpc_user *fl, struct device *dev, 263 u64 size, struct fastrpc_buf **obuf) 264 { 265 struct fastrpc_buf *buf; 266 267 buf = kzalloc(sizeof(*buf), GFP_KERNEL); 268 if (!buf) 269 return -ENOMEM; 270 271 INIT_LIST_HEAD(&buf->attachments); 272 mutex_init(&buf->lock); 273 274 buf->fl = fl; 275 buf->virt = NULL; 276 buf->phys = 0; 277 buf->size = size; 278 buf->dev = dev; 279 280 buf->virt = dma_alloc_coherent(dev, buf->size, (dma_addr_t *)&buf->phys, 281 GFP_KERNEL); 282 if (!buf->virt) { 283 mutex_destroy(&buf->lock); 284 kfree(buf); 285 return -ENOMEM; 286 } 287 288 if (fl->sctx && fl->sctx->sid) 289 buf->phys += ((u64)fl->sctx->sid << 32); 290 291 *obuf = buf; 292 293 return 0; 294 } 295 296 static void fastrpc_channel_ctx_free(struct kref *ref) 297 { 298 struct fastrpc_channel_ctx *cctx; 299 300 cctx = container_of(ref, struct fastrpc_channel_ctx, refcount); 301 302 kfree(cctx); 303 } 304 305 static void fastrpc_channel_ctx_get(struct fastrpc_channel_ctx *cctx) 306 { 307 kref_get(&cctx->refcount); 308 } 309 310 static void fastrpc_channel_ctx_put(struct fastrpc_channel_ctx *cctx) 311 { 312 kref_put(&cctx->refcount, fastrpc_channel_ctx_free); 313 } 314 315 static void fastrpc_context_free(struct kref *ref) 316 { 317 struct fastrpc_invoke_ctx *ctx; 318 struct fastrpc_channel_ctx *cctx; 319 unsigned long flags; 320 int i; 321 322 ctx = container_of(ref, struct fastrpc_invoke_ctx, refcount); 323 cctx = ctx->cctx; 324 325 for (i = 0; i < ctx->nscalars; i++) 326 fastrpc_map_put(ctx->maps[i]); 327 328 if (ctx->buf) 329 fastrpc_buf_free(ctx->buf); 330 331 spin_lock_irqsave(&cctx->lock, flags); 332 idr_remove(&cctx->ctx_idr, ctx->ctxid >> 4); 333 spin_unlock_irqrestore(&cctx->lock, flags); 334 335 kfree(ctx->maps); 336 kfree(ctx->olaps); 337 kfree(ctx); 338 339 fastrpc_channel_ctx_put(cctx); 340 } 341 342 static void fastrpc_context_get(struct fastrpc_invoke_ctx *ctx) 343 { 344 kref_get(&ctx->refcount); 345 } 346 347 static void fastrpc_context_put(struct fastrpc_invoke_ctx *ctx) 348 { 349 kref_put(&ctx->refcount, fastrpc_context_free); 350 } 351 352 static void fastrpc_context_put_wq(struct work_struct *work) 353 { 354 struct fastrpc_invoke_ctx *ctx = 355 container_of(work, struct fastrpc_invoke_ctx, put_work); 356 357 fastrpc_context_put(ctx); 358 } 359 360 #define CMP(aa, bb) ((aa) == (bb) ? 0 : (aa) < (bb) ? -1 : 1) 361 static int olaps_cmp(const void *a, const void *b) 362 { 363 struct fastrpc_buf_overlap *pa = (struct fastrpc_buf_overlap *)a; 364 struct fastrpc_buf_overlap *pb = (struct fastrpc_buf_overlap *)b; 365 /* sort with lowest starting buffer first */ 366 int st = CMP(pa->start, pb->start); 367 /* sort with highest ending buffer first */ 368 int ed = CMP(pb->end, pa->end); 369 370 return st == 0 ? ed : st; 371 } 372 373 static void fastrpc_get_buff_overlaps(struct fastrpc_invoke_ctx *ctx) 374 { 375 u64 max_end = 0; 376 int i; 377 378 for (i = 0; i < ctx->nbufs; ++i) { 379 ctx->olaps[i].start = ctx->args[i].ptr; 380 ctx->olaps[i].end = ctx->olaps[i].start + ctx->args[i].length; 381 ctx->olaps[i].raix = i; 382 } 383 384 sort(ctx->olaps, ctx->nbufs, sizeof(*ctx->olaps), olaps_cmp, NULL); 385 386 for (i = 0; i < ctx->nbufs; ++i) { 387 /* Falling inside previous range */ 388 if (ctx->olaps[i].start < max_end) { 389 ctx->olaps[i].mstart = max_end; 390 ctx->olaps[i].mend = ctx->olaps[i].end; 391 ctx->olaps[i].offset = max_end - ctx->olaps[i].start; 392 393 if (ctx->olaps[i].end > max_end) { 394 max_end = ctx->olaps[i].end; 395 } else { 396 ctx->olaps[i].mend = 0; 397 ctx->olaps[i].mstart = 0; 398 } 399 400 } else { 401 ctx->olaps[i].mend = ctx->olaps[i].end; 402 ctx->olaps[i].mstart = ctx->olaps[i].start; 403 ctx->olaps[i].offset = 0; 404 max_end = ctx->olaps[i].end; 405 } 406 } 407 } 408 409 static struct fastrpc_invoke_ctx *fastrpc_context_alloc( 410 struct fastrpc_user *user, u32 kernel, u32 sc, 411 struct fastrpc_invoke_args *args) 412 { 413 struct fastrpc_channel_ctx *cctx = user->cctx; 414 struct fastrpc_invoke_ctx *ctx = NULL; 415 unsigned long flags; 416 int ret; 417 418 ctx = kzalloc(sizeof(*ctx), GFP_KERNEL); 419 if (!ctx) 420 return ERR_PTR(-ENOMEM); 421 422 INIT_LIST_HEAD(&ctx->node); 423 ctx->fl = user; 424 ctx->nscalars = REMOTE_SCALARS_LENGTH(sc); 425 ctx->nbufs = REMOTE_SCALARS_INBUFS(sc) + 426 REMOTE_SCALARS_OUTBUFS(sc); 427 428 if (ctx->nscalars) { 429 ctx->maps = kcalloc(ctx->nscalars, 430 sizeof(*ctx->maps), GFP_KERNEL); 431 if (!ctx->maps) { 432 kfree(ctx); 433 return ERR_PTR(-ENOMEM); 434 } 435 ctx->olaps = kcalloc(ctx->nscalars, 436 sizeof(*ctx->olaps), GFP_KERNEL); 437 if (!ctx->olaps) { 438 kfree(ctx->maps); 439 kfree(ctx); 440 return ERR_PTR(-ENOMEM); 441 } 442 ctx->args = args; 443 fastrpc_get_buff_overlaps(ctx); 444 } 445 446 /* Released in fastrpc_context_put() */ 447 fastrpc_channel_ctx_get(cctx); 448 449 ctx->sc = sc; 450 ctx->retval = -1; 451 ctx->pid = current->pid; 452 ctx->tgid = user->tgid; 453 ctx->cctx = cctx; 454 init_completion(&ctx->work); 455 INIT_WORK(&ctx->put_work, fastrpc_context_put_wq); 456 457 spin_lock(&user->lock); 458 list_add_tail(&ctx->node, &user->pending); 459 spin_unlock(&user->lock); 460 461 spin_lock_irqsave(&cctx->lock, flags); 462 ret = idr_alloc_cyclic(&cctx->ctx_idr, ctx, 1, 463 FASTRPC_CTX_MAX, GFP_ATOMIC); 464 if (ret < 0) { 465 spin_unlock_irqrestore(&cctx->lock, flags); 466 goto err_idr; 467 } 468 ctx->ctxid = ret << 4; 469 spin_unlock_irqrestore(&cctx->lock, flags); 470 471 kref_init(&ctx->refcount); 472 473 return ctx; 474 err_idr: 475 spin_lock(&user->lock); 476 list_del(&ctx->node); 477 spin_unlock(&user->lock); 478 fastrpc_channel_ctx_put(cctx); 479 kfree(ctx->maps); 480 kfree(ctx->olaps); 481 kfree(ctx); 482 483 return ERR_PTR(ret); 484 } 485 486 static struct sg_table * 487 fastrpc_map_dma_buf(struct dma_buf_attachment *attachment, 488 enum dma_data_direction dir) 489 { 490 struct fastrpc_dma_buf_attachment *a = attachment->priv; 491 struct sg_table *table; 492 493 table = &a->sgt; 494 495 if (!dma_map_sg(attachment->dev, table->sgl, table->nents, dir)) 496 return ERR_PTR(-ENOMEM); 497 498 return table; 499 } 500 501 static void fastrpc_unmap_dma_buf(struct dma_buf_attachment *attach, 502 struct sg_table *table, 503 enum dma_data_direction dir) 504 { 505 dma_unmap_sg(attach->dev, table->sgl, table->nents, dir); 506 } 507 508 static void fastrpc_release(struct dma_buf *dmabuf) 509 { 510 struct fastrpc_buf *buffer = dmabuf->priv; 511 512 fastrpc_buf_free(buffer); 513 } 514 515 static int fastrpc_dma_buf_attach(struct dma_buf *dmabuf, 516 struct dma_buf_attachment *attachment) 517 { 518 struct fastrpc_dma_buf_attachment *a; 519 struct fastrpc_buf *buffer = dmabuf->priv; 520 int ret; 521 522 a = kzalloc(sizeof(*a), GFP_KERNEL); 523 if (!a) 524 return -ENOMEM; 525 526 ret = dma_get_sgtable(buffer->dev, &a->sgt, buffer->virt, 527 FASTRPC_PHYS(buffer->phys), buffer->size); 528 if (ret < 0) { 529 dev_err(buffer->dev, "failed to get scatterlist from DMA API\n"); 530 kfree(a); 531 return -EINVAL; 532 } 533 534 a->dev = attachment->dev; 535 INIT_LIST_HEAD(&a->node); 536 attachment->priv = a; 537 538 mutex_lock(&buffer->lock); 539 list_add(&a->node, &buffer->attachments); 540 mutex_unlock(&buffer->lock); 541 542 return 0; 543 } 544 545 static void fastrpc_dma_buf_detatch(struct dma_buf *dmabuf, 546 struct dma_buf_attachment *attachment) 547 { 548 struct fastrpc_dma_buf_attachment *a = attachment->priv; 549 struct fastrpc_buf *buffer = dmabuf->priv; 550 551 mutex_lock(&buffer->lock); 552 list_del(&a->node); 553 mutex_unlock(&buffer->lock); 554 sg_free_table(&a->sgt); 555 kfree(a); 556 } 557 558 static void *fastrpc_kmap(struct dma_buf *dmabuf, unsigned long pgnum) 559 { 560 struct fastrpc_buf *buf = dmabuf->priv; 561 562 return buf->virt ? buf->virt + pgnum * PAGE_SIZE : NULL; 563 } 564 565 static void *fastrpc_vmap(struct dma_buf *dmabuf) 566 { 567 struct fastrpc_buf *buf = dmabuf->priv; 568 569 return buf->virt; 570 } 571 572 static int fastrpc_mmap(struct dma_buf *dmabuf, 573 struct vm_area_struct *vma) 574 { 575 struct fastrpc_buf *buf = dmabuf->priv; 576 size_t size = vma->vm_end - vma->vm_start; 577 578 return dma_mmap_coherent(buf->dev, vma, buf->virt, 579 FASTRPC_PHYS(buf->phys), size); 580 } 581 582 static const struct dma_buf_ops fastrpc_dma_buf_ops = { 583 .attach = fastrpc_dma_buf_attach, 584 .detach = fastrpc_dma_buf_detatch, 585 .map_dma_buf = fastrpc_map_dma_buf, 586 .unmap_dma_buf = fastrpc_unmap_dma_buf, 587 .mmap = fastrpc_mmap, 588 .map = fastrpc_kmap, 589 .vmap = fastrpc_vmap, 590 .release = fastrpc_release, 591 }; 592 593 static int fastrpc_map_create(struct fastrpc_user *fl, int fd, 594 u64 len, struct fastrpc_map **ppmap) 595 { 596 struct fastrpc_session_ctx *sess = fl->sctx; 597 struct fastrpc_map *map = NULL; 598 int err = 0; 599 600 if (!fastrpc_map_find(fl, fd, ppmap)) 601 return 0; 602 603 map = kzalloc(sizeof(*map), GFP_KERNEL); 604 if (!map) 605 return -ENOMEM; 606 607 INIT_LIST_HEAD(&map->node); 608 map->fl = fl; 609 map->fd = fd; 610 map->buf = dma_buf_get(fd); 611 if (IS_ERR(map->buf)) { 612 err = PTR_ERR(map->buf); 613 goto get_err; 614 } 615 616 map->attach = dma_buf_attach(map->buf, sess->dev); 617 if (IS_ERR(map->attach)) { 618 dev_err(sess->dev, "Failed to attach dmabuf\n"); 619 err = PTR_ERR(map->attach); 620 goto attach_err; 621 } 622 623 map->table = dma_buf_map_attachment(map->attach, DMA_BIDIRECTIONAL); 624 if (IS_ERR(map->table)) { 625 err = PTR_ERR(map->table); 626 goto map_err; 627 } 628 629 map->phys = sg_dma_address(map->table->sgl); 630 map->phys += ((u64)fl->sctx->sid << 32); 631 map->size = len; 632 map->va = sg_virt(map->table->sgl); 633 map->len = len; 634 kref_init(&map->refcount); 635 636 spin_lock(&fl->lock); 637 list_add_tail(&map->node, &fl->maps); 638 spin_unlock(&fl->lock); 639 *ppmap = map; 640 641 return 0; 642 643 map_err: 644 dma_buf_detach(map->buf, map->attach); 645 attach_err: 646 dma_buf_put(map->buf); 647 get_err: 648 kfree(map); 649 650 return err; 651 } 652 653 /* 654 * Fastrpc payload buffer with metadata looks like: 655 * 656 * >>>>>> START of METADATA <<<<<<<<< 657 * +---------------------------------+ 658 * | Arguments | 659 * | type:(struct fastrpc_remote_arg)| 660 * | (0 - N) | 661 * +---------------------------------+ 662 * | Invoke Buffer list | 663 * | type:(struct fastrpc_invoke_buf)| 664 * | (0 - N) | 665 * +---------------------------------+ 666 * | Page info list | 667 * | type:(struct fastrpc_phy_page) | 668 * | (0 - N) | 669 * +---------------------------------+ 670 * | Optional info | 671 * |(can be specific to SoC/Firmware)| 672 * +---------------------------------+ 673 * >>>>>>>> END of METADATA <<<<<<<<< 674 * +---------------------------------+ 675 * | Inline ARGS | 676 * | (0-N) | 677 * +---------------------------------+ 678 */ 679 680 static int fastrpc_get_meta_size(struct fastrpc_invoke_ctx *ctx) 681 { 682 int size = 0; 683 684 size = (sizeof(struct fastrpc_remote_arg) + 685 sizeof(struct fastrpc_invoke_buf) + 686 sizeof(struct fastrpc_phy_page)) * ctx->nscalars + 687 sizeof(u64) * FASTRPC_MAX_FDLIST + 688 sizeof(u32) * FASTRPC_MAX_CRCLIST; 689 690 return size; 691 } 692 693 static u64 fastrpc_get_payload_size(struct fastrpc_invoke_ctx *ctx, int metalen) 694 { 695 u64 size = 0; 696 int i; 697 698 size = ALIGN(metalen, FASTRPC_ALIGN); 699 for (i = 0; i < ctx->nscalars; i++) { 700 if (ctx->args[i].fd == 0 || ctx->args[i].fd == -1) { 701 702 if (ctx->olaps[i].offset == 0) 703 size = ALIGN(size, FASTRPC_ALIGN); 704 705 size += (ctx->olaps[i].mend - ctx->olaps[i].mstart); 706 } 707 } 708 709 return size; 710 } 711 712 static int fastrpc_create_maps(struct fastrpc_invoke_ctx *ctx) 713 { 714 struct device *dev = ctx->fl->sctx->dev; 715 int i, err; 716 717 for (i = 0; i < ctx->nscalars; ++i) { 718 /* Make sure reserved field is set to 0 */ 719 if (ctx->args[i].reserved) 720 return -EINVAL; 721 722 if (ctx->args[i].fd == 0 || ctx->args[i].fd == -1 || 723 ctx->args[i].length == 0) 724 continue; 725 726 err = fastrpc_map_create(ctx->fl, ctx->args[i].fd, 727 ctx->args[i].length, &ctx->maps[i]); 728 if (err) { 729 dev_err(dev, "Error Creating map %d\n", err); 730 return -EINVAL; 731 } 732 733 } 734 return 0; 735 } 736 737 static int fastrpc_get_args(u32 kernel, struct fastrpc_invoke_ctx *ctx) 738 { 739 struct device *dev = ctx->fl->sctx->dev; 740 struct fastrpc_remote_arg *rpra; 741 struct fastrpc_invoke_buf *list; 742 struct fastrpc_phy_page *pages; 743 int inbufs, i, oix, err = 0; 744 u64 len, rlen, pkt_size; 745 u64 pg_start, pg_end; 746 uintptr_t args; 747 int metalen; 748 749 inbufs = REMOTE_SCALARS_INBUFS(ctx->sc); 750 metalen = fastrpc_get_meta_size(ctx); 751 pkt_size = fastrpc_get_payload_size(ctx, metalen); 752 753 err = fastrpc_create_maps(ctx); 754 if (err) 755 return err; 756 757 ctx->msg_sz = pkt_size; 758 759 err = fastrpc_buf_alloc(ctx->fl, dev, pkt_size, &ctx->buf); 760 if (err) 761 return err; 762 763 rpra = ctx->buf->virt; 764 list = ctx->buf->virt + ctx->nscalars * sizeof(*rpra); 765 pages = ctx->buf->virt + ctx->nscalars * (sizeof(*list) + 766 sizeof(*rpra)); 767 args = (uintptr_t)ctx->buf->virt + metalen; 768 rlen = pkt_size - metalen; 769 ctx->rpra = rpra; 770 771 for (oix = 0; oix < ctx->nbufs; ++oix) { 772 int mlen; 773 774 i = ctx->olaps[oix].raix; 775 len = ctx->args[i].length; 776 777 rpra[i].pv = 0; 778 rpra[i].len = len; 779 list[i].num = len ? 1 : 0; 780 list[i].pgidx = i; 781 782 if (!len) 783 continue; 784 785 if (ctx->maps[i]) { 786 struct vm_area_struct *vma = NULL; 787 788 rpra[i].pv = (u64) ctx->args[i].ptr; 789 pages[i].addr = ctx->maps[i]->phys; 790 791 vma = find_vma(current->mm, ctx->args[i].ptr); 792 if (vma) 793 pages[i].addr += ctx->args[i].ptr - 794 vma->vm_start; 795 796 pg_start = (ctx->args[i].ptr & PAGE_MASK) >> PAGE_SHIFT; 797 pg_end = ((ctx->args[i].ptr + len - 1) & PAGE_MASK) >> 798 PAGE_SHIFT; 799 pages[i].size = (pg_end - pg_start + 1) * PAGE_SIZE; 800 801 } else { 802 803 if (ctx->olaps[oix].offset == 0) { 804 rlen -= ALIGN(args, FASTRPC_ALIGN) - args; 805 args = ALIGN(args, FASTRPC_ALIGN); 806 } 807 808 mlen = ctx->olaps[oix].mend - ctx->olaps[oix].mstart; 809 810 if (rlen < mlen) 811 goto bail; 812 813 rpra[i].pv = args - ctx->olaps[oix].offset; 814 pages[i].addr = ctx->buf->phys - 815 ctx->olaps[oix].offset + 816 (pkt_size - rlen); 817 pages[i].addr = pages[i].addr & PAGE_MASK; 818 819 pg_start = (args & PAGE_MASK) >> PAGE_SHIFT; 820 pg_end = ((args + len - 1) & PAGE_MASK) >> PAGE_SHIFT; 821 pages[i].size = (pg_end - pg_start + 1) * PAGE_SIZE; 822 args = args + mlen; 823 rlen -= mlen; 824 } 825 826 if (i < inbufs && !ctx->maps[i]) { 827 void *dst = (void *)(uintptr_t)rpra[i].pv; 828 void *src = (void *)(uintptr_t)ctx->args[i].ptr; 829 830 if (!kernel) { 831 if (copy_from_user(dst, (void __user *)src, 832 len)) { 833 err = -EFAULT; 834 goto bail; 835 } 836 } else { 837 memcpy(dst, src, len); 838 } 839 } 840 } 841 842 for (i = ctx->nbufs; i < ctx->nscalars; ++i) { 843 rpra[i].pv = (u64) ctx->args[i].ptr; 844 rpra[i].len = ctx->args[i].length; 845 list[i].num = ctx->args[i].length ? 1 : 0; 846 list[i].pgidx = i; 847 pages[i].addr = ctx->maps[i]->phys; 848 pages[i].size = ctx->maps[i]->size; 849 } 850 851 bail: 852 if (err) 853 dev_err(dev, "Error: get invoke args failed:%d\n", err); 854 855 return err; 856 } 857 858 static int fastrpc_put_args(struct fastrpc_invoke_ctx *ctx, 859 u32 kernel) 860 { 861 struct fastrpc_remote_arg *rpra = ctx->rpra; 862 int i, inbufs; 863 864 inbufs = REMOTE_SCALARS_INBUFS(ctx->sc); 865 866 for (i = inbufs; i < ctx->nbufs; ++i) { 867 void *src = (void *)(uintptr_t)rpra[i].pv; 868 void *dst = (void *)(uintptr_t)ctx->args[i].ptr; 869 u64 len = rpra[i].len; 870 871 if (!kernel) { 872 if (copy_to_user((void __user *)dst, src, len)) 873 return -EFAULT; 874 } else { 875 memcpy(dst, src, len); 876 } 877 } 878 879 return 0; 880 } 881 882 static int fastrpc_invoke_send(struct fastrpc_session_ctx *sctx, 883 struct fastrpc_invoke_ctx *ctx, 884 u32 kernel, uint32_t handle) 885 { 886 struct fastrpc_channel_ctx *cctx; 887 struct fastrpc_user *fl = ctx->fl; 888 struct fastrpc_msg *msg = &ctx->msg; 889 890 cctx = fl->cctx; 891 msg->pid = fl->tgid; 892 msg->tid = current->pid; 893 894 if (kernel) 895 msg->pid = 0; 896 897 msg->ctx = ctx->ctxid | fl->pd; 898 msg->handle = handle; 899 msg->sc = ctx->sc; 900 msg->addr = ctx->buf ? ctx->buf->phys : 0; 901 msg->size = roundup(ctx->msg_sz, PAGE_SIZE); 902 fastrpc_context_get(ctx); 903 904 return rpmsg_send(cctx->rpdev->ept, (void *)msg, sizeof(*msg)); 905 } 906 907 static int fastrpc_internal_invoke(struct fastrpc_user *fl, u32 kernel, 908 u32 handle, u32 sc, 909 struct fastrpc_invoke_args *args) 910 { 911 struct fastrpc_invoke_ctx *ctx = NULL; 912 int err = 0; 913 914 if (!fl->sctx) 915 return -EINVAL; 916 917 if (!fl->cctx->rpdev) 918 return -EPIPE; 919 920 ctx = fastrpc_context_alloc(fl, kernel, sc, args); 921 if (IS_ERR(ctx)) 922 return PTR_ERR(ctx); 923 924 if (ctx->nscalars) { 925 err = fastrpc_get_args(kernel, ctx); 926 if (err) 927 goto bail; 928 } 929 930 /* make sure that all CPU memory writes are seen by DSP */ 931 dma_wmb(); 932 /* Send invoke buffer to remote dsp */ 933 err = fastrpc_invoke_send(fl->sctx, ctx, kernel, handle); 934 if (err) 935 goto bail; 936 937 /* Wait for remote dsp to respond or time out */ 938 err = wait_for_completion_interruptible(&ctx->work); 939 if (err) 940 goto bail; 941 942 /* Check the response from remote dsp */ 943 err = ctx->retval; 944 if (err) 945 goto bail; 946 947 if (ctx->nscalars) { 948 /* make sure that all memory writes by DSP are seen by CPU */ 949 dma_rmb(); 950 /* populate all the output buffers with results */ 951 err = fastrpc_put_args(ctx, kernel); 952 if (err) 953 goto bail; 954 } 955 956 bail: 957 /* We are done with this compute context, remove it from pending list */ 958 spin_lock(&fl->lock); 959 list_del(&ctx->node); 960 spin_unlock(&fl->lock); 961 fastrpc_context_put(ctx); 962 963 if (err) 964 dev_dbg(fl->sctx->dev, "Error: Invoke Failed %d\n", err); 965 966 return err; 967 } 968 969 static int fastrpc_init_create_process(struct fastrpc_user *fl, 970 char __user *argp) 971 { 972 struct fastrpc_init_create init; 973 struct fastrpc_invoke_args *args; 974 struct fastrpc_phy_page pages[1]; 975 struct fastrpc_map *map = NULL; 976 struct fastrpc_buf *imem = NULL; 977 int memlen; 978 int err; 979 struct { 980 int pgid; 981 u32 namelen; 982 u32 filelen; 983 u32 pageslen; 984 u32 attrs; 985 u32 siglen; 986 } inbuf; 987 u32 sc; 988 989 args = kcalloc(FASTRPC_CREATE_PROCESS_NARGS, sizeof(*args), GFP_KERNEL); 990 if (!args) 991 return -ENOMEM; 992 993 if (copy_from_user(&init, argp, sizeof(init))) { 994 err = -EFAULT; 995 goto err; 996 } 997 998 if (init.filelen > INIT_FILELEN_MAX) { 999 err = -EINVAL; 1000 goto err; 1001 } 1002 1003 inbuf.pgid = fl->tgid; 1004 inbuf.namelen = strlen(current->comm) + 1; 1005 inbuf.filelen = init.filelen; 1006 inbuf.pageslen = 1; 1007 inbuf.attrs = init.attrs; 1008 inbuf.siglen = init.siglen; 1009 fl->pd = 1; 1010 1011 if (init.filelen && init.filefd) { 1012 err = fastrpc_map_create(fl, init.filefd, init.filelen, &map); 1013 if (err) 1014 goto err; 1015 } 1016 1017 memlen = ALIGN(max(INIT_FILELEN_MAX, (int)init.filelen * 4), 1018 1024 * 1024); 1019 err = fastrpc_buf_alloc(fl, fl->sctx->dev, memlen, 1020 &imem); 1021 if (err) 1022 goto err_alloc; 1023 1024 fl->init_mem = imem; 1025 args[0].ptr = (u64)(uintptr_t)&inbuf; 1026 args[0].length = sizeof(inbuf); 1027 args[0].fd = -1; 1028 1029 args[1].ptr = (u64)(uintptr_t)current->comm; 1030 args[1].length = inbuf.namelen; 1031 args[1].fd = -1; 1032 1033 args[2].ptr = (u64) init.file; 1034 args[2].length = inbuf.filelen; 1035 args[2].fd = init.filefd; 1036 1037 pages[0].addr = imem->phys; 1038 pages[0].size = imem->size; 1039 1040 args[3].ptr = (u64)(uintptr_t) pages; 1041 args[3].length = 1 * sizeof(*pages); 1042 args[3].fd = -1; 1043 1044 args[4].ptr = (u64)(uintptr_t)&inbuf.attrs; 1045 args[4].length = sizeof(inbuf.attrs); 1046 args[4].fd = -1; 1047 1048 args[5].ptr = (u64)(uintptr_t) &inbuf.siglen; 1049 args[5].length = sizeof(inbuf.siglen); 1050 args[5].fd = -1; 1051 1052 sc = FASTRPC_SCALARS(FASTRPC_RMID_INIT_CREATE, 4, 0); 1053 if (init.attrs) 1054 sc = FASTRPC_SCALARS(FASTRPC_RMID_INIT_CREATE_ATTR, 6, 0); 1055 1056 err = fastrpc_internal_invoke(fl, true, FASTRPC_INIT_HANDLE, 1057 sc, args); 1058 if (err) 1059 goto err_invoke; 1060 1061 kfree(args); 1062 1063 return 0; 1064 1065 err_invoke: 1066 fl->init_mem = NULL; 1067 fastrpc_buf_free(imem); 1068 err_alloc: 1069 if (map) { 1070 spin_lock(&fl->lock); 1071 list_del(&map->node); 1072 spin_unlock(&fl->lock); 1073 fastrpc_map_put(map); 1074 } 1075 err: 1076 kfree(args); 1077 1078 return err; 1079 } 1080 1081 static struct fastrpc_session_ctx *fastrpc_session_alloc( 1082 struct fastrpc_channel_ctx *cctx) 1083 { 1084 struct fastrpc_session_ctx *session = NULL; 1085 unsigned long flags; 1086 int i; 1087 1088 spin_lock_irqsave(&cctx->lock, flags); 1089 for (i = 0; i < cctx->sesscount; i++) { 1090 if (!cctx->session[i].used && cctx->session[i].valid) { 1091 cctx->session[i].used = true; 1092 session = &cctx->session[i]; 1093 break; 1094 } 1095 } 1096 spin_unlock_irqrestore(&cctx->lock, flags); 1097 1098 return session; 1099 } 1100 1101 static void fastrpc_session_free(struct fastrpc_channel_ctx *cctx, 1102 struct fastrpc_session_ctx *session) 1103 { 1104 unsigned long flags; 1105 1106 spin_lock_irqsave(&cctx->lock, flags); 1107 session->used = false; 1108 spin_unlock_irqrestore(&cctx->lock, flags); 1109 } 1110 1111 static int fastrpc_release_current_dsp_process(struct fastrpc_user *fl) 1112 { 1113 struct fastrpc_invoke_args args[1]; 1114 int tgid = 0; 1115 u32 sc; 1116 1117 tgid = fl->tgid; 1118 args[0].ptr = (u64)(uintptr_t) &tgid; 1119 args[0].length = sizeof(tgid); 1120 args[0].fd = -1; 1121 args[0].reserved = 0; 1122 sc = FASTRPC_SCALARS(FASTRPC_RMID_INIT_RELEASE, 1, 0); 1123 1124 return fastrpc_internal_invoke(fl, true, FASTRPC_INIT_HANDLE, 1125 sc, &args[0]); 1126 } 1127 1128 static int fastrpc_device_release(struct inode *inode, struct file *file) 1129 { 1130 struct fastrpc_user *fl = (struct fastrpc_user *)file->private_data; 1131 struct fastrpc_channel_ctx *cctx = fl->cctx; 1132 struct fastrpc_invoke_ctx *ctx, *n; 1133 struct fastrpc_map *map, *m; 1134 unsigned long flags; 1135 1136 fastrpc_release_current_dsp_process(fl); 1137 1138 spin_lock_irqsave(&cctx->lock, flags); 1139 list_del(&fl->user); 1140 spin_unlock_irqrestore(&cctx->lock, flags); 1141 1142 if (fl->init_mem) 1143 fastrpc_buf_free(fl->init_mem); 1144 1145 list_for_each_entry_safe(ctx, n, &fl->pending, node) { 1146 list_del(&ctx->node); 1147 fastrpc_context_put(ctx); 1148 } 1149 1150 list_for_each_entry_safe(map, m, &fl->maps, node) { 1151 list_del(&map->node); 1152 fastrpc_map_put(map); 1153 } 1154 1155 fastrpc_session_free(cctx, fl->sctx); 1156 fastrpc_channel_ctx_put(cctx); 1157 1158 mutex_destroy(&fl->mutex); 1159 kfree(fl); 1160 file->private_data = NULL; 1161 1162 return 0; 1163 } 1164 1165 static int fastrpc_device_open(struct inode *inode, struct file *filp) 1166 { 1167 struct fastrpc_channel_ctx *cctx = miscdev_to_cctx(filp->private_data); 1168 struct fastrpc_user *fl = NULL; 1169 unsigned long flags; 1170 1171 fl = kzalloc(sizeof(*fl), GFP_KERNEL); 1172 if (!fl) 1173 return -ENOMEM; 1174 1175 /* Released in fastrpc_device_release() */ 1176 fastrpc_channel_ctx_get(cctx); 1177 1178 filp->private_data = fl; 1179 spin_lock_init(&fl->lock); 1180 mutex_init(&fl->mutex); 1181 INIT_LIST_HEAD(&fl->pending); 1182 INIT_LIST_HEAD(&fl->maps); 1183 INIT_LIST_HEAD(&fl->user); 1184 fl->tgid = current->tgid; 1185 fl->cctx = cctx; 1186 1187 fl->sctx = fastrpc_session_alloc(cctx); 1188 if (!fl->sctx) { 1189 dev_err(&cctx->rpdev->dev, "No session available\n"); 1190 mutex_destroy(&fl->mutex); 1191 kfree(fl); 1192 1193 return -EBUSY; 1194 } 1195 1196 spin_lock_irqsave(&cctx->lock, flags); 1197 list_add_tail(&fl->user, &cctx->users); 1198 spin_unlock_irqrestore(&cctx->lock, flags); 1199 1200 return 0; 1201 } 1202 1203 static int fastrpc_dmabuf_alloc(struct fastrpc_user *fl, char __user *argp) 1204 { 1205 struct fastrpc_alloc_dma_buf bp; 1206 DEFINE_DMA_BUF_EXPORT_INFO(exp_info); 1207 struct fastrpc_buf *buf = NULL; 1208 int err; 1209 1210 if (copy_from_user(&bp, argp, sizeof(bp))) 1211 return -EFAULT; 1212 1213 err = fastrpc_buf_alloc(fl, fl->sctx->dev, bp.size, &buf); 1214 if (err) 1215 return err; 1216 exp_info.ops = &fastrpc_dma_buf_ops; 1217 exp_info.size = bp.size; 1218 exp_info.flags = O_RDWR; 1219 exp_info.priv = buf; 1220 buf->dmabuf = dma_buf_export(&exp_info); 1221 if (IS_ERR(buf->dmabuf)) { 1222 err = PTR_ERR(buf->dmabuf); 1223 fastrpc_buf_free(buf); 1224 return err; 1225 } 1226 1227 bp.fd = dma_buf_fd(buf->dmabuf, O_ACCMODE); 1228 if (bp.fd < 0) { 1229 dma_buf_put(buf->dmabuf); 1230 return -EINVAL; 1231 } 1232 1233 if (copy_to_user(argp, &bp, sizeof(bp))) { 1234 dma_buf_put(buf->dmabuf); 1235 return -EFAULT; 1236 } 1237 1238 return 0; 1239 } 1240 1241 static int fastrpc_init_attach(struct fastrpc_user *fl) 1242 { 1243 struct fastrpc_invoke_args args[1]; 1244 int tgid = fl->tgid; 1245 u32 sc; 1246 1247 args[0].ptr = (u64)(uintptr_t) &tgid; 1248 args[0].length = sizeof(tgid); 1249 args[0].fd = -1; 1250 args[0].reserved = 0; 1251 sc = FASTRPC_SCALARS(FASTRPC_RMID_INIT_ATTACH, 1, 0); 1252 fl->pd = 0; 1253 1254 return fastrpc_internal_invoke(fl, true, FASTRPC_INIT_HANDLE, 1255 sc, &args[0]); 1256 } 1257 1258 static int fastrpc_invoke(struct fastrpc_user *fl, char __user *argp) 1259 { 1260 struct fastrpc_invoke_args *args = NULL; 1261 struct fastrpc_invoke inv; 1262 u32 nscalars; 1263 int err; 1264 1265 if (copy_from_user(&inv, argp, sizeof(inv))) 1266 return -EFAULT; 1267 1268 /* nscalars is truncated here to max supported value */ 1269 nscalars = REMOTE_SCALARS_LENGTH(inv.sc); 1270 if (nscalars) { 1271 args = kcalloc(nscalars, sizeof(*args), GFP_KERNEL); 1272 if (!args) 1273 return -ENOMEM; 1274 1275 if (copy_from_user(args, (void __user *)(uintptr_t)inv.args, 1276 nscalars * sizeof(*args))) { 1277 kfree(args); 1278 return -EFAULT; 1279 } 1280 } 1281 1282 err = fastrpc_internal_invoke(fl, false, inv.handle, inv.sc, args); 1283 kfree(args); 1284 1285 return err; 1286 } 1287 1288 static long fastrpc_device_ioctl(struct file *file, unsigned int cmd, 1289 unsigned long arg) 1290 { 1291 struct fastrpc_user *fl = (struct fastrpc_user *)file->private_data; 1292 char __user *argp = (char __user *)arg; 1293 int err; 1294 1295 switch (cmd) { 1296 case FASTRPC_IOCTL_INVOKE: 1297 err = fastrpc_invoke(fl, argp); 1298 break; 1299 case FASTRPC_IOCTL_INIT_ATTACH: 1300 err = fastrpc_init_attach(fl); 1301 break; 1302 case FASTRPC_IOCTL_INIT_CREATE: 1303 err = fastrpc_init_create_process(fl, argp); 1304 break; 1305 case FASTRPC_IOCTL_ALLOC_DMA_BUFF: 1306 err = fastrpc_dmabuf_alloc(fl, argp); 1307 break; 1308 default: 1309 err = -ENOTTY; 1310 break; 1311 } 1312 1313 return err; 1314 } 1315 1316 static const struct file_operations fastrpc_fops = { 1317 .open = fastrpc_device_open, 1318 .release = fastrpc_device_release, 1319 .unlocked_ioctl = fastrpc_device_ioctl, 1320 .compat_ioctl = fastrpc_device_ioctl, 1321 }; 1322 1323 static int fastrpc_cb_probe(struct platform_device *pdev) 1324 { 1325 struct fastrpc_channel_ctx *cctx; 1326 struct fastrpc_session_ctx *sess; 1327 struct device *dev = &pdev->dev; 1328 int i, sessions = 0; 1329 unsigned long flags; 1330 int rc; 1331 1332 cctx = dev_get_drvdata(dev->parent); 1333 if (!cctx) 1334 return -EINVAL; 1335 1336 of_property_read_u32(dev->of_node, "qcom,nsessions", &sessions); 1337 1338 spin_lock_irqsave(&cctx->lock, flags); 1339 sess = &cctx->session[cctx->sesscount]; 1340 sess->used = false; 1341 sess->valid = true; 1342 sess->dev = dev; 1343 dev_set_drvdata(dev, sess); 1344 1345 if (of_property_read_u32(dev->of_node, "reg", &sess->sid)) 1346 dev_info(dev, "FastRPC Session ID not specified in DT\n"); 1347 1348 if (sessions > 0) { 1349 struct fastrpc_session_ctx *dup_sess; 1350 1351 for (i = 1; i < sessions; i++) { 1352 if (cctx->sesscount++ >= FASTRPC_MAX_SESSIONS) 1353 break; 1354 dup_sess = &cctx->session[cctx->sesscount]; 1355 memcpy(dup_sess, sess, sizeof(*dup_sess)); 1356 } 1357 } 1358 cctx->sesscount++; 1359 spin_unlock_irqrestore(&cctx->lock, flags); 1360 rc = dma_set_mask(dev, DMA_BIT_MASK(32)); 1361 if (rc) { 1362 dev_err(dev, "32-bit DMA enable failed\n"); 1363 return rc; 1364 } 1365 1366 return 0; 1367 } 1368 1369 static int fastrpc_cb_remove(struct platform_device *pdev) 1370 { 1371 struct fastrpc_channel_ctx *cctx = dev_get_drvdata(pdev->dev.parent); 1372 struct fastrpc_session_ctx *sess = dev_get_drvdata(&pdev->dev); 1373 unsigned long flags; 1374 int i; 1375 1376 spin_lock_irqsave(&cctx->lock, flags); 1377 for (i = 1; i < FASTRPC_MAX_SESSIONS; i++) { 1378 if (cctx->session[i].sid == sess->sid) { 1379 cctx->session[i].valid = false; 1380 cctx->sesscount--; 1381 } 1382 } 1383 spin_unlock_irqrestore(&cctx->lock, flags); 1384 1385 return 0; 1386 } 1387 1388 static const struct of_device_id fastrpc_match_table[] = { 1389 { .compatible = "qcom,fastrpc-compute-cb", }, 1390 {} 1391 }; 1392 1393 static struct platform_driver fastrpc_cb_driver = { 1394 .probe = fastrpc_cb_probe, 1395 .remove = fastrpc_cb_remove, 1396 .driver = { 1397 .name = "qcom,fastrpc-cb", 1398 .of_match_table = fastrpc_match_table, 1399 .suppress_bind_attrs = true, 1400 }, 1401 }; 1402 1403 static int fastrpc_rpmsg_probe(struct rpmsg_device *rpdev) 1404 { 1405 struct device *rdev = &rpdev->dev; 1406 struct fastrpc_channel_ctx *data; 1407 int i, err, domain_id = -1; 1408 const char *domain; 1409 1410 err = of_property_read_string(rdev->of_node, "label", &domain); 1411 if (err) { 1412 dev_info(rdev, "FastRPC Domain not specified in DT\n"); 1413 return err; 1414 } 1415 1416 for (i = 0; i <= CDSP_DOMAIN_ID; i++) { 1417 if (!strcmp(domains[i], domain)) { 1418 domain_id = i; 1419 break; 1420 } 1421 } 1422 1423 if (domain_id < 0) { 1424 dev_info(rdev, "FastRPC Invalid Domain ID %d\n", domain_id); 1425 return -EINVAL; 1426 } 1427 1428 data = kzalloc(sizeof(*data), GFP_KERNEL); 1429 if (!data) 1430 return -ENOMEM; 1431 1432 data->miscdev.minor = MISC_DYNAMIC_MINOR; 1433 data->miscdev.name = kasprintf(GFP_KERNEL, "fastrpc-%s", 1434 domains[domain_id]); 1435 data->miscdev.fops = &fastrpc_fops; 1436 err = misc_register(&data->miscdev); 1437 if (err) 1438 return err; 1439 1440 kref_init(&data->refcount); 1441 1442 dev_set_drvdata(&rpdev->dev, data); 1443 dma_set_mask_and_coherent(rdev, DMA_BIT_MASK(32)); 1444 INIT_LIST_HEAD(&data->users); 1445 spin_lock_init(&data->lock); 1446 idr_init(&data->ctx_idr); 1447 data->domain_id = domain_id; 1448 data->rpdev = rpdev; 1449 1450 return of_platform_populate(rdev->of_node, NULL, NULL, rdev); 1451 } 1452 1453 static void fastrpc_notify_users(struct fastrpc_user *user) 1454 { 1455 struct fastrpc_invoke_ctx *ctx; 1456 1457 spin_lock(&user->lock); 1458 list_for_each_entry(ctx, &user->pending, node) 1459 complete(&ctx->work); 1460 spin_unlock(&user->lock); 1461 } 1462 1463 static void fastrpc_rpmsg_remove(struct rpmsg_device *rpdev) 1464 { 1465 struct fastrpc_channel_ctx *cctx = dev_get_drvdata(&rpdev->dev); 1466 struct fastrpc_user *user; 1467 unsigned long flags; 1468 1469 spin_lock_irqsave(&cctx->lock, flags); 1470 list_for_each_entry(user, &cctx->users, user) 1471 fastrpc_notify_users(user); 1472 spin_unlock_irqrestore(&cctx->lock, flags); 1473 1474 misc_deregister(&cctx->miscdev); 1475 of_platform_depopulate(&rpdev->dev); 1476 1477 cctx->rpdev = NULL; 1478 fastrpc_channel_ctx_put(cctx); 1479 } 1480 1481 static int fastrpc_rpmsg_callback(struct rpmsg_device *rpdev, void *data, 1482 int len, void *priv, u32 addr) 1483 { 1484 struct fastrpc_channel_ctx *cctx = dev_get_drvdata(&rpdev->dev); 1485 struct fastrpc_invoke_rsp *rsp = data; 1486 struct fastrpc_invoke_ctx *ctx; 1487 unsigned long flags; 1488 unsigned long ctxid; 1489 1490 if (len < sizeof(*rsp)) 1491 return -EINVAL; 1492 1493 ctxid = ((rsp->ctx & FASTRPC_CTXID_MASK) >> 4); 1494 1495 spin_lock_irqsave(&cctx->lock, flags); 1496 ctx = idr_find(&cctx->ctx_idr, ctxid); 1497 spin_unlock_irqrestore(&cctx->lock, flags); 1498 1499 if (!ctx) { 1500 dev_err(&rpdev->dev, "No context ID matches response\n"); 1501 return -ENOENT; 1502 } 1503 1504 ctx->retval = rsp->retval; 1505 complete(&ctx->work); 1506 1507 /* 1508 * The DMA buffer associated with the context cannot be freed in 1509 * interrupt context so schedule it through a worker thread to 1510 * avoid a kernel BUG. 1511 */ 1512 schedule_work(&ctx->put_work); 1513 1514 return 0; 1515 } 1516 1517 static const struct of_device_id fastrpc_rpmsg_of_match[] = { 1518 { .compatible = "qcom,fastrpc" }, 1519 { }, 1520 }; 1521 MODULE_DEVICE_TABLE(of, fastrpc_rpmsg_of_match); 1522 1523 static struct rpmsg_driver fastrpc_driver = { 1524 .probe = fastrpc_rpmsg_probe, 1525 .remove = fastrpc_rpmsg_remove, 1526 .callback = fastrpc_rpmsg_callback, 1527 .drv = { 1528 .name = "qcom,fastrpc", 1529 .of_match_table = fastrpc_rpmsg_of_match, 1530 }, 1531 }; 1532 1533 static int fastrpc_init(void) 1534 { 1535 int ret; 1536 1537 ret = platform_driver_register(&fastrpc_cb_driver); 1538 if (ret < 0) { 1539 pr_err("fastrpc: failed to register cb driver\n"); 1540 return ret; 1541 } 1542 1543 ret = register_rpmsg_driver(&fastrpc_driver); 1544 if (ret < 0) { 1545 pr_err("fastrpc: failed to register rpmsg driver\n"); 1546 platform_driver_unregister(&fastrpc_cb_driver); 1547 return ret; 1548 } 1549 1550 return 0; 1551 } 1552 module_init(fastrpc_init); 1553 1554 static void fastrpc_exit(void) 1555 { 1556 platform_driver_unregister(&fastrpc_cb_driver); 1557 unregister_rpmsg_driver(&fastrpc_driver); 1558 } 1559 module_exit(fastrpc_exit); 1560 1561 MODULE_LICENSE("GPL v2"); 1562