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