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