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