1 // SPDX-License-Identifier: GPL-2.0
2 // Copyright (c) 2011-2018, The Linux Foundation. All rights reserved.
3 // Copyright (c) 2018, Linaro Limited
5 #include <linux/completion.h>
6 #include <linux/device.h>
7 #include <linux/dma-buf.h>
8 #include <linux/dma-mapping.h>
10 #include <linux/list.h>
11 #include <linux/miscdevice.h>
12 #include <linux/module.h>
13 #include <linux/of_address.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>
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"
38 /* Retrives number of input buffers from the scalars parameter */
39 #define REMOTE_SCALARS_INBUFS(sc) (((sc) >> 16) & 0x0ff)
41 /* Retrives number of output buffers from the scalars parameter */
42 #define REMOTE_SCALARS_OUTBUFS(sc) (((sc) >> 8) & 0x0ff)
44 /* Retrives number of input handles from the scalars parameter */
45 #define REMOTE_SCALARS_INHANDLES(sc) (((sc) >> 4) & 0x0f)
47 /* Retrives number of output handles from the scalars parameter */
48 #define REMOTE_SCALARS_OUTHANDLES(sc) ((sc) & 0x0f)
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) | \
62 #define FASTRPC_SCALARS(method, in, out) \
63 FASTRPC_BUILD_SCALARS(0, method, in, out, 0, 0)
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
73 #define miscdev_to_cctx(d) container_of(d, struct fastrpc_channel_ctx, miscdev)
75 static const char *domains[FASTRPC_DEV_MAX] = { "adsp", "mdsp",
77 struct fastrpc_phy_page {
78 u64 addr; /* physical address */
79 u64 size; /* size of contiguous region */
82 struct fastrpc_invoke_buf {
83 u32 num; /* number of contiguous regions */
84 u32 pgidx; /* index to start of contiguous region */
87 struct fastrpc_remote_arg {
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 */
102 struct fastrpc_invoke_rsp {
103 u64 ctx; /* invoke caller context */
104 int retval; /* invoke return value */
107 struct fastrpc_buf_overlap {
117 struct fastrpc_user *fl;
118 struct dma_buf *dmabuf;
123 /* Lock for dma buf attachments */
125 struct list_head attachments;
128 struct fastrpc_dma_buf_attachment {
131 struct list_head node;
135 struct list_head node;
136 struct fastrpc_user *fl;
139 struct sg_table *table;
140 struct dma_buf_attachment *attach;
145 struct kref refcount;
148 struct fastrpc_invoke_ctx {
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;
172 struct fastrpc_session_ctx {
179 struct fastrpc_channel_ctx {
182 struct rpmsg_device *rpdev;
183 struct fastrpc_session_ctx session[FASTRPC_MAX_SESSIONS];
186 struct list_head users;
187 struct miscdevice miscdev;
188 struct kref refcount;
191 struct fastrpc_user {
192 struct list_head user;
193 struct list_head maps;
194 struct list_head pending;
196 struct fastrpc_channel_ctx *cctx;
197 struct fastrpc_session_ctx *sctx;
198 struct fastrpc_buf *init_mem;
204 /* lock for allocations */
208 static void fastrpc_free_map(struct kref *ref)
210 struct fastrpc_map *map;
212 map = container_of(ref, struct fastrpc_map, refcount);
215 dma_buf_unmap_attachment(map->attach, map->table,
217 dma_buf_detach(map->buf, map->attach);
218 dma_buf_put(map->buf);
224 static void fastrpc_map_put(struct fastrpc_map *map)
227 kref_put(&map->refcount, fastrpc_free_map);
230 static void fastrpc_map_get(struct fastrpc_map *map)
233 kref_get(&map->refcount);
236 static int fastrpc_map_find(struct fastrpc_user *fl, int fd,
237 struct fastrpc_map **ppmap)
239 struct fastrpc_map *map = NULL;
241 mutex_lock(&fl->mutex);
242 list_for_each_entry(map, &fl->maps, node) {
244 fastrpc_map_get(map);
246 mutex_unlock(&fl->mutex);
250 mutex_unlock(&fl->mutex);
255 static void fastrpc_buf_free(struct fastrpc_buf *buf)
257 dma_free_coherent(buf->dev, buf->size, buf->virt,
258 FASTRPC_PHYS(buf->phys));
262 static int fastrpc_buf_alloc(struct fastrpc_user *fl, struct device *dev,
263 u64 size, struct fastrpc_buf **obuf)
265 struct fastrpc_buf *buf;
267 buf = kzalloc(sizeof(*buf), GFP_KERNEL);
271 INIT_LIST_HEAD(&buf->attachments);
272 mutex_init(&buf->lock);
280 buf->virt = dma_alloc_coherent(dev, buf->size, (dma_addr_t *)&buf->phys,
283 mutex_destroy(&buf->lock);
288 if (fl->sctx && fl->sctx->sid)
289 buf->phys += ((u64)fl->sctx->sid << 32);
296 static void fastrpc_channel_ctx_free(struct kref *ref)
298 struct fastrpc_channel_ctx *cctx;
300 cctx = container_of(ref, struct fastrpc_channel_ctx, refcount);
305 static void fastrpc_channel_ctx_get(struct fastrpc_channel_ctx *cctx)
307 kref_get(&cctx->refcount);
310 static void fastrpc_channel_ctx_put(struct fastrpc_channel_ctx *cctx)
312 kref_put(&cctx->refcount, fastrpc_channel_ctx_free);
315 static void fastrpc_context_free(struct kref *ref)
317 struct fastrpc_invoke_ctx *ctx;
318 struct fastrpc_channel_ctx *cctx;
322 ctx = container_of(ref, struct fastrpc_invoke_ctx, refcount);
325 for (i = 0; i < ctx->nscalars; i++)
326 fastrpc_map_put(ctx->maps[i]);
329 fastrpc_buf_free(ctx->buf);
331 spin_lock_irqsave(&cctx->lock, flags);
332 idr_remove(&cctx->ctx_idr, ctx->ctxid >> 4);
333 spin_unlock_irqrestore(&cctx->lock, flags);
339 fastrpc_channel_ctx_put(cctx);
342 static void fastrpc_context_get(struct fastrpc_invoke_ctx *ctx)
344 kref_get(&ctx->refcount);
347 static void fastrpc_context_put(struct fastrpc_invoke_ctx *ctx)
349 kref_put(&ctx->refcount, fastrpc_context_free);
352 static void fastrpc_context_put_wq(struct work_struct *work)
354 struct fastrpc_invoke_ctx *ctx =
355 container_of(work, struct fastrpc_invoke_ctx, put_work);
357 fastrpc_context_put(ctx);
360 #define CMP(aa, bb) ((aa) == (bb) ? 0 : (aa) < (bb) ? -1 : 1)
361 static int olaps_cmp(const void *a, const void *b)
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);
370 return st == 0 ? ed : st;
373 static void fastrpc_get_buff_overlaps(struct fastrpc_invoke_ctx *ctx)
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;
384 sort(ctx->olaps, ctx->nbufs, sizeof(*ctx->olaps), olaps_cmp, NULL);
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;
393 if (ctx->olaps[i].end > max_end) {
394 max_end = ctx->olaps[i].end;
396 ctx->olaps[i].mend = 0;
397 ctx->olaps[i].mstart = 0;
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;
409 static struct fastrpc_invoke_ctx *fastrpc_context_alloc(
410 struct fastrpc_user *user, u32 kernel, u32 sc,
411 struct fastrpc_invoke_args *args)
413 struct fastrpc_channel_ctx *cctx = user->cctx;
414 struct fastrpc_invoke_ctx *ctx = NULL;
418 ctx = kzalloc(sizeof(*ctx), GFP_KERNEL);
420 return ERR_PTR(-ENOMEM);
422 INIT_LIST_HEAD(&ctx->node);
424 ctx->nscalars = REMOTE_SCALARS_LENGTH(sc);
425 ctx->nbufs = REMOTE_SCALARS_INBUFS(sc) +
426 REMOTE_SCALARS_OUTBUFS(sc);
429 ctx->maps = kcalloc(ctx->nscalars,
430 sizeof(*ctx->maps), GFP_KERNEL);
433 return ERR_PTR(-ENOMEM);
435 ctx->olaps = kcalloc(ctx->nscalars,
436 sizeof(*ctx->olaps), GFP_KERNEL);
440 return ERR_PTR(-ENOMEM);
443 fastrpc_get_buff_overlaps(ctx);
446 /* Released in fastrpc_context_put() */
447 fastrpc_channel_ctx_get(cctx);
451 ctx->pid = current->pid;
452 ctx->tgid = user->tgid;
454 init_completion(&ctx->work);
455 INIT_WORK(&ctx->put_work, fastrpc_context_put_wq);
457 spin_lock(&user->lock);
458 list_add_tail(&ctx->node, &user->pending);
459 spin_unlock(&user->lock);
461 spin_lock_irqsave(&cctx->lock, flags);
462 ret = idr_alloc_cyclic(&cctx->ctx_idr, ctx, 1,
463 FASTRPC_CTX_MAX, GFP_ATOMIC);
465 spin_unlock_irqrestore(&cctx->lock, flags);
468 ctx->ctxid = ret << 4;
469 spin_unlock_irqrestore(&cctx->lock, flags);
471 kref_init(&ctx->refcount);
475 spin_lock(&user->lock);
476 list_del(&ctx->node);
477 spin_unlock(&user->lock);
478 fastrpc_channel_ctx_put(cctx);
486 static struct sg_table *
487 fastrpc_map_dma_buf(struct dma_buf_attachment *attachment,
488 enum dma_data_direction dir)
490 struct fastrpc_dma_buf_attachment *a = attachment->priv;
491 struct sg_table *table;
495 if (!dma_map_sg(attachment->dev, table->sgl, table->nents, dir))
496 return ERR_PTR(-ENOMEM);
501 static void fastrpc_unmap_dma_buf(struct dma_buf_attachment *attach,
502 struct sg_table *table,
503 enum dma_data_direction dir)
505 dma_unmap_sg(attach->dev, table->sgl, table->nents, dir);
508 static void fastrpc_release(struct dma_buf *dmabuf)
510 struct fastrpc_buf *buffer = dmabuf->priv;
512 fastrpc_buf_free(buffer);
515 static int fastrpc_dma_buf_attach(struct dma_buf *dmabuf,
516 struct dma_buf_attachment *attachment)
518 struct fastrpc_dma_buf_attachment *a;
519 struct fastrpc_buf *buffer = dmabuf->priv;
522 a = kzalloc(sizeof(*a), GFP_KERNEL);
526 ret = dma_get_sgtable(buffer->dev, &a->sgt, buffer->virt,
527 FASTRPC_PHYS(buffer->phys), buffer->size);
529 dev_err(buffer->dev, "failed to get scatterlist from DMA API\n");
533 a->dev = attachment->dev;
534 INIT_LIST_HEAD(&a->node);
535 attachment->priv = a;
537 mutex_lock(&buffer->lock);
538 list_add(&a->node, &buffer->attachments);
539 mutex_unlock(&buffer->lock);
544 static void fastrpc_dma_buf_detatch(struct dma_buf *dmabuf,
545 struct dma_buf_attachment *attachment)
547 struct fastrpc_dma_buf_attachment *a = attachment->priv;
548 struct fastrpc_buf *buffer = dmabuf->priv;
550 mutex_lock(&buffer->lock);
552 mutex_unlock(&buffer->lock);
556 static void *fastrpc_kmap(struct dma_buf *dmabuf, unsigned long pgnum)
558 struct fastrpc_buf *buf = dmabuf->priv;
560 return buf->virt ? buf->virt + pgnum * PAGE_SIZE : NULL;
563 static void *fastrpc_vmap(struct dma_buf *dmabuf)
565 struct fastrpc_buf *buf = dmabuf->priv;
570 static int fastrpc_mmap(struct dma_buf *dmabuf,
571 struct vm_area_struct *vma)
573 struct fastrpc_buf *buf = dmabuf->priv;
574 size_t size = vma->vm_end - vma->vm_start;
576 return dma_mmap_coherent(buf->dev, vma, buf->virt,
577 FASTRPC_PHYS(buf->phys), size);
580 static const struct dma_buf_ops fastrpc_dma_buf_ops = {
581 .attach = fastrpc_dma_buf_attach,
582 .detach = fastrpc_dma_buf_detatch,
583 .map_dma_buf = fastrpc_map_dma_buf,
584 .unmap_dma_buf = fastrpc_unmap_dma_buf,
585 .mmap = fastrpc_mmap,
587 .vmap = fastrpc_vmap,
588 .release = fastrpc_release,
591 static int fastrpc_map_create(struct fastrpc_user *fl, int fd,
592 u64 len, struct fastrpc_map **ppmap)
594 struct fastrpc_session_ctx *sess = fl->sctx;
595 struct fastrpc_map *map = NULL;
598 if (!fastrpc_map_find(fl, fd, ppmap))
601 map = kzalloc(sizeof(*map), GFP_KERNEL);
605 INIT_LIST_HEAD(&map->node);
608 map->buf = dma_buf_get(fd);
609 if (IS_ERR(map->buf)) {
610 err = PTR_ERR(map->buf);
614 map->attach = dma_buf_attach(map->buf, sess->dev);
615 if (IS_ERR(map->attach)) {
616 dev_err(sess->dev, "Failed to attach dmabuf\n");
617 err = PTR_ERR(map->attach);
621 map->table = dma_buf_map_attachment(map->attach, DMA_BIDIRECTIONAL);
622 if (IS_ERR(map->table)) {
623 err = PTR_ERR(map->table);
627 map->phys = sg_dma_address(map->table->sgl);
628 map->phys += ((u64)fl->sctx->sid << 32);
630 map->va = sg_virt(map->table->sgl);
632 kref_init(&map->refcount);
634 spin_lock(&fl->lock);
635 list_add_tail(&map->node, &fl->maps);
636 spin_unlock(&fl->lock);
642 dma_buf_detach(map->buf, map->attach);
644 dma_buf_put(map->buf);
652 * Fastrpc payload buffer with metadata looks like:
654 * >>>>>> START of METADATA <<<<<<<<<
655 * +---------------------------------+
657 * | type:(struct fastrpc_remote_arg)|
659 * +---------------------------------+
660 * | Invoke Buffer list |
661 * | type:(struct fastrpc_invoke_buf)|
663 * +---------------------------------+
665 * | type:(struct fastrpc_phy_page) |
667 * +---------------------------------+
669 * |(can be specific to SoC/Firmware)|
670 * +---------------------------------+
671 * >>>>>>>> END of METADATA <<<<<<<<<
672 * +---------------------------------+
675 * +---------------------------------+
678 static int fastrpc_get_meta_size(struct fastrpc_invoke_ctx *ctx)
682 size = (sizeof(struct fastrpc_remote_arg) +
683 sizeof(struct fastrpc_invoke_buf) +
684 sizeof(struct fastrpc_phy_page)) * ctx->nscalars +
685 sizeof(u64) * FASTRPC_MAX_FDLIST +
686 sizeof(u32) * FASTRPC_MAX_CRCLIST;
691 static u64 fastrpc_get_payload_size(struct fastrpc_invoke_ctx *ctx, int metalen)
696 size = ALIGN(metalen, FASTRPC_ALIGN);
697 for (i = 0; i < ctx->nscalars; i++) {
698 if (ctx->args[i].fd == 0 || ctx->args[i].fd == -1) {
700 if (ctx->olaps[i].offset == 0)
701 size = ALIGN(size, FASTRPC_ALIGN);
703 size += (ctx->olaps[i].mend - ctx->olaps[i].mstart);
710 static int fastrpc_create_maps(struct fastrpc_invoke_ctx *ctx)
712 struct device *dev = ctx->fl->sctx->dev;
715 for (i = 0; i < ctx->nscalars; ++i) {
716 /* Make sure reserved field is set to 0 */
717 if (ctx->args[i].reserved)
720 if (ctx->args[i].fd == 0 || ctx->args[i].fd == -1 ||
721 ctx->args[i].length == 0)
724 err = fastrpc_map_create(ctx->fl, ctx->args[i].fd,
725 ctx->args[i].length, &ctx->maps[i]);
727 dev_err(dev, "Error Creating map %d\n", err);
735 static int fastrpc_get_args(u32 kernel, struct fastrpc_invoke_ctx *ctx)
737 struct device *dev = ctx->fl->sctx->dev;
738 struct fastrpc_remote_arg *rpra;
739 struct fastrpc_invoke_buf *list;
740 struct fastrpc_phy_page *pages;
741 int inbufs, i, oix, err = 0;
742 u64 len, rlen, pkt_size;
743 u64 pg_start, pg_end;
747 inbufs = REMOTE_SCALARS_INBUFS(ctx->sc);
748 metalen = fastrpc_get_meta_size(ctx);
749 pkt_size = fastrpc_get_payload_size(ctx, metalen);
751 err = fastrpc_create_maps(ctx);
755 ctx->msg_sz = pkt_size;
757 err = fastrpc_buf_alloc(ctx->fl, dev, pkt_size, &ctx->buf);
761 rpra = ctx->buf->virt;
762 list = ctx->buf->virt + ctx->nscalars * sizeof(*rpra);
763 pages = ctx->buf->virt + ctx->nscalars * (sizeof(*list) +
765 args = (uintptr_t)ctx->buf->virt + metalen;
766 rlen = pkt_size - metalen;
769 for (oix = 0; oix < ctx->nbufs; ++oix) {
772 i = ctx->olaps[oix].raix;
773 len = ctx->args[i].length;
777 list[i].num = len ? 1 : 0;
784 struct vm_area_struct *vma = NULL;
786 rpra[i].pv = (u64) ctx->args[i].ptr;
787 pages[i].addr = ctx->maps[i]->phys;
789 vma = find_vma(current->mm, ctx->args[i].ptr);
791 pages[i].addr += ctx->args[i].ptr -
794 pg_start = (ctx->args[i].ptr & PAGE_MASK) >> PAGE_SHIFT;
795 pg_end = ((ctx->args[i].ptr + len - 1) & PAGE_MASK) >>
797 pages[i].size = (pg_end - pg_start + 1) * PAGE_SIZE;
801 if (ctx->olaps[oix].offset == 0) {
802 rlen -= ALIGN(args, FASTRPC_ALIGN) - args;
803 args = ALIGN(args, FASTRPC_ALIGN);
806 mlen = ctx->olaps[oix].mend - ctx->olaps[oix].mstart;
811 rpra[i].pv = args - ctx->olaps[oix].offset;
812 pages[i].addr = ctx->buf->phys -
813 ctx->olaps[oix].offset +
815 pages[i].addr = pages[i].addr & PAGE_MASK;
817 pg_start = (args & PAGE_MASK) >> PAGE_SHIFT;
818 pg_end = ((args + len - 1) & PAGE_MASK) >> PAGE_SHIFT;
819 pages[i].size = (pg_end - pg_start + 1) * PAGE_SIZE;
824 if (i < inbufs && !ctx->maps[i]) {
825 void *dst = (void *)(uintptr_t)rpra[i].pv;
826 void *src = (void *)(uintptr_t)ctx->args[i].ptr;
829 if (copy_from_user(dst, (void __user *)src,
835 memcpy(dst, src, len);
840 for (i = ctx->nbufs; i < ctx->nscalars; ++i) {
841 rpra[i].pv = (u64) ctx->args[i].ptr;
842 rpra[i].len = ctx->args[i].length;
843 list[i].num = ctx->args[i].length ? 1 : 0;
845 pages[i].addr = ctx->maps[i]->phys;
846 pages[i].size = ctx->maps[i]->size;
851 dev_err(dev, "Error: get invoke args failed:%d\n", err);
856 static int fastrpc_put_args(struct fastrpc_invoke_ctx *ctx,
859 struct fastrpc_remote_arg *rpra = ctx->rpra;
862 inbufs = REMOTE_SCALARS_INBUFS(ctx->sc);
864 for (i = inbufs; i < ctx->nbufs; ++i) {
865 void *src = (void *)(uintptr_t)rpra[i].pv;
866 void *dst = (void *)(uintptr_t)ctx->args[i].ptr;
867 u64 len = rpra[i].len;
870 if (copy_to_user((void __user *)dst, src, len))
873 memcpy(dst, src, len);
880 static int fastrpc_invoke_send(struct fastrpc_session_ctx *sctx,
881 struct fastrpc_invoke_ctx *ctx,
882 u32 kernel, uint32_t handle)
884 struct fastrpc_channel_ctx *cctx;
885 struct fastrpc_user *fl = ctx->fl;
886 struct fastrpc_msg *msg = &ctx->msg;
890 msg->tid = current->pid;
895 msg->ctx = ctx->ctxid | fl->pd;
896 msg->handle = handle;
898 msg->addr = ctx->buf ? ctx->buf->phys : 0;
899 msg->size = roundup(ctx->msg_sz, PAGE_SIZE);
900 fastrpc_context_get(ctx);
902 return rpmsg_send(cctx->rpdev->ept, (void *)msg, sizeof(*msg));
905 static int fastrpc_internal_invoke(struct fastrpc_user *fl, u32 kernel,
907 struct fastrpc_invoke_args *args)
909 struct fastrpc_invoke_ctx *ctx = NULL;
915 if (!fl->cctx->rpdev)
918 ctx = fastrpc_context_alloc(fl, kernel, sc, args);
923 err = fastrpc_get_args(kernel, ctx);
928 /* make sure that all CPU memory writes are seen by DSP */
930 /* Send invoke buffer to remote dsp */
931 err = fastrpc_invoke_send(fl->sctx, ctx, kernel, handle);
935 /* Wait for remote dsp to respond or time out */
936 err = wait_for_completion_interruptible(&ctx->work);
940 /* Check the response from remote dsp */
946 /* make sure that all memory writes by DSP are seen by CPU */
948 /* populate all the output buffers with results */
949 err = fastrpc_put_args(ctx, kernel);
955 /* We are done with this compute context, remove it from pending list */
956 spin_lock(&fl->lock);
957 list_del(&ctx->node);
958 spin_unlock(&fl->lock);
959 fastrpc_context_put(ctx);
962 dev_dbg(fl->sctx->dev, "Error: Invoke Failed %d\n", err);
967 static int fastrpc_init_create_process(struct fastrpc_user *fl,
970 struct fastrpc_init_create init;
971 struct fastrpc_invoke_args *args;
972 struct fastrpc_phy_page pages[1];
973 struct fastrpc_map *map = NULL;
974 struct fastrpc_buf *imem = NULL;
987 args = kcalloc(FASTRPC_CREATE_PROCESS_NARGS, sizeof(*args), GFP_KERNEL);
991 if (copy_from_user(&init, argp, sizeof(init))) {
996 if (init.filelen > INIT_FILELEN_MAX) {
1001 inbuf.pgid = fl->tgid;
1002 inbuf.namelen = strlen(current->comm) + 1;
1003 inbuf.filelen = init.filelen;
1005 inbuf.attrs = init.attrs;
1006 inbuf.siglen = init.siglen;
1009 if (init.filelen && init.filefd) {
1010 err = fastrpc_map_create(fl, init.filefd, init.filelen, &map);
1015 memlen = ALIGN(max(INIT_FILELEN_MAX, (int)init.filelen * 4),
1017 err = fastrpc_buf_alloc(fl, fl->sctx->dev, memlen,
1022 fl->init_mem = imem;
1023 args[0].ptr = (u64)(uintptr_t)&inbuf;
1024 args[0].length = sizeof(inbuf);
1027 args[1].ptr = (u64)(uintptr_t)current->comm;
1028 args[1].length = inbuf.namelen;
1031 args[2].ptr = (u64) init.file;
1032 args[2].length = inbuf.filelen;
1033 args[2].fd = init.filefd;
1035 pages[0].addr = imem->phys;
1036 pages[0].size = imem->size;
1038 args[3].ptr = (u64)(uintptr_t) pages;
1039 args[3].length = 1 * sizeof(*pages);
1042 args[4].ptr = (u64)(uintptr_t)&inbuf.attrs;
1043 args[4].length = sizeof(inbuf.attrs);
1046 args[5].ptr = (u64)(uintptr_t) &inbuf.siglen;
1047 args[5].length = sizeof(inbuf.siglen);
1050 sc = FASTRPC_SCALARS(FASTRPC_RMID_INIT_CREATE, 4, 0);
1052 sc = FASTRPC_SCALARS(FASTRPC_RMID_INIT_CREATE_ATTR, 6, 0);
1054 err = fastrpc_internal_invoke(fl, true, FASTRPC_INIT_HANDLE,
1064 fl->init_mem = NULL;
1065 fastrpc_buf_free(imem);
1068 spin_lock(&fl->lock);
1069 list_del(&map->node);
1070 spin_unlock(&fl->lock);
1071 fastrpc_map_put(map);
1079 static struct fastrpc_session_ctx *fastrpc_session_alloc(
1080 struct fastrpc_channel_ctx *cctx)
1082 struct fastrpc_session_ctx *session = NULL;
1083 unsigned long flags;
1086 spin_lock_irqsave(&cctx->lock, flags);
1087 for (i = 0; i < cctx->sesscount; i++) {
1088 if (!cctx->session[i].used && cctx->session[i].valid) {
1089 cctx->session[i].used = true;
1090 session = &cctx->session[i];
1094 spin_unlock_irqrestore(&cctx->lock, flags);
1099 static void fastrpc_session_free(struct fastrpc_channel_ctx *cctx,
1100 struct fastrpc_session_ctx *session)
1102 unsigned long flags;
1104 spin_lock_irqsave(&cctx->lock, flags);
1105 session->used = false;
1106 spin_unlock_irqrestore(&cctx->lock, flags);
1109 static int fastrpc_release_current_dsp_process(struct fastrpc_user *fl)
1111 struct fastrpc_invoke_args args[1];
1116 args[0].ptr = (u64)(uintptr_t) &tgid;
1117 args[0].length = sizeof(tgid);
1119 args[0].reserved = 0;
1120 sc = FASTRPC_SCALARS(FASTRPC_RMID_INIT_RELEASE, 1, 0);
1122 return fastrpc_internal_invoke(fl, true, FASTRPC_INIT_HANDLE,
1126 static int fastrpc_device_release(struct inode *inode, struct file *file)
1128 struct fastrpc_user *fl = (struct fastrpc_user *)file->private_data;
1129 struct fastrpc_channel_ctx *cctx = fl->cctx;
1130 struct fastrpc_invoke_ctx *ctx, *n;
1131 struct fastrpc_map *map, *m;
1132 unsigned long flags;
1134 fastrpc_release_current_dsp_process(fl);
1136 spin_lock_irqsave(&cctx->lock, flags);
1137 list_del(&fl->user);
1138 spin_unlock_irqrestore(&cctx->lock, flags);
1141 fastrpc_buf_free(fl->init_mem);
1143 list_for_each_entry_safe(ctx, n, &fl->pending, node) {
1144 list_del(&ctx->node);
1145 fastrpc_context_put(ctx);
1148 list_for_each_entry_safe(map, m, &fl->maps, node) {
1149 list_del(&map->node);
1150 fastrpc_map_put(map);
1153 fastrpc_session_free(cctx, fl->sctx);
1154 fastrpc_channel_ctx_put(cctx);
1156 mutex_destroy(&fl->mutex);
1158 file->private_data = NULL;
1163 static int fastrpc_device_open(struct inode *inode, struct file *filp)
1165 struct fastrpc_channel_ctx *cctx = miscdev_to_cctx(filp->private_data);
1166 struct fastrpc_user *fl = NULL;
1167 unsigned long flags;
1169 fl = kzalloc(sizeof(*fl), GFP_KERNEL);
1173 /* Released in fastrpc_device_release() */
1174 fastrpc_channel_ctx_get(cctx);
1176 filp->private_data = fl;
1177 spin_lock_init(&fl->lock);
1178 mutex_init(&fl->mutex);
1179 INIT_LIST_HEAD(&fl->pending);
1180 INIT_LIST_HEAD(&fl->maps);
1181 INIT_LIST_HEAD(&fl->user);
1182 fl->tgid = current->tgid;
1185 fl->sctx = fastrpc_session_alloc(cctx);
1187 dev_err(&cctx->rpdev->dev, "No session available\n");
1188 mutex_destroy(&fl->mutex);
1194 spin_lock_irqsave(&cctx->lock, flags);
1195 list_add_tail(&fl->user, &cctx->users);
1196 spin_unlock_irqrestore(&cctx->lock, flags);
1201 static int fastrpc_dmabuf_free(struct fastrpc_user *fl, char __user *argp)
1203 struct dma_buf *buf;
1206 if (copy_from_user(&info, argp, sizeof(info)))
1209 buf = dma_buf_get(info);
1210 if (IS_ERR_OR_NULL(buf))
1213 * one for the last get and other for the ALLOC_DMA_BUFF ioctl
1221 static int fastrpc_dmabuf_alloc(struct fastrpc_user *fl, char __user *argp)
1223 struct fastrpc_alloc_dma_buf bp;
1224 DEFINE_DMA_BUF_EXPORT_INFO(exp_info);
1225 struct fastrpc_buf *buf = NULL;
1228 if (copy_from_user(&bp, argp, sizeof(bp)))
1231 err = fastrpc_buf_alloc(fl, fl->sctx->dev, bp.size, &buf);
1234 exp_info.ops = &fastrpc_dma_buf_ops;
1235 exp_info.size = bp.size;
1236 exp_info.flags = O_RDWR;
1237 exp_info.priv = buf;
1238 buf->dmabuf = dma_buf_export(&exp_info);
1239 if (IS_ERR(buf->dmabuf)) {
1240 err = PTR_ERR(buf->dmabuf);
1241 fastrpc_buf_free(buf);
1245 bp.fd = dma_buf_fd(buf->dmabuf, O_ACCMODE);
1247 dma_buf_put(buf->dmabuf);
1251 if (copy_to_user(argp, &bp, sizeof(bp))) {
1252 dma_buf_put(buf->dmabuf);
1256 get_dma_buf(buf->dmabuf);
1261 static int fastrpc_init_attach(struct fastrpc_user *fl)
1263 struct fastrpc_invoke_args args[1];
1264 int tgid = fl->tgid;
1267 args[0].ptr = (u64)(uintptr_t) &tgid;
1268 args[0].length = sizeof(tgid);
1270 args[0].reserved = 0;
1271 sc = FASTRPC_SCALARS(FASTRPC_RMID_INIT_ATTACH, 1, 0);
1274 return fastrpc_internal_invoke(fl, true, FASTRPC_INIT_HANDLE,
1278 static int fastrpc_invoke(struct fastrpc_user *fl, char __user *argp)
1280 struct fastrpc_invoke_args *args = NULL;
1281 struct fastrpc_invoke inv;
1285 if (copy_from_user(&inv, argp, sizeof(inv)))
1288 /* nscalars is truncated here to max supported value */
1289 nscalars = REMOTE_SCALARS_LENGTH(inv.sc);
1291 args = kcalloc(nscalars, sizeof(*args), GFP_KERNEL);
1295 if (copy_from_user(args, (void __user *)(uintptr_t)inv.args,
1296 nscalars * sizeof(*args))) {
1302 err = fastrpc_internal_invoke(fl, false, inv.handle, inv.sc, args);
1308 static long fastrpc_device_ioctl(struct file *file, unsigned int cmd,
1311 struct fastrpc_user *fl = (struct fastrpc_user *)file->private_data;
1312 char __user *argp = (char __user *)arg;
1316 case FASTRPC_IOCTL_INVOKE:
1317 err = fastrpc_invoke(fl, argp);
1319 case FASTRPC_IOCTL_INIT_ATTACH:
1320 err = fastrpc_init_attach(fl);
1322 case FASTRPC_IOCTL_INIT_CREATE:
1323 err = fastrpc_init_create_process(fl, argp);
1325 case FASTRPC_IOCTL_FREE_DMA_BUFF:
1326 err = fastrpc_dmabuf_free(fl, argp);
1328 case FASTRPC_IOCTL_ALLOC_DMA_BUFF:
1329 err = fastrpc_dmabuf_alloc(fl, argp);
1339 static const struct file_operations fastrpc_fops = {
1340 .open = fastrpc_device_open,
1341 .release = fastrpc_device_release,
1342 .unlocked_ioctl = fastrpc_device_ioctl,
1343 .compat_ioctl = fastrpc_device_ioctl,
1346 static int fastrpc_cb_probe(struct platform_device *pdev)
1348 struct fastrpc_channel_ctx *cctx;
1349 struct fastrpc_session_ctx *sess;
1350 struct device *dev = &pdev->dev;
1351 int i, sessions = 0;
1352 unsigned long flags;
1355 cctx = dev_get_drvdata(dev->parent);
1359 of_property_read_u32(dev->of_node, "qcom,nsessions", &sessions);
1361 spin_lock_irqsave(&cctx->lock, flags);
1362 sess = &cctx->session[cctx->sesscount];
1366 dev_set_drvdata(dev, sess);
1368 if (of_property_read_u32(dev->of_node, "reg", &sess->sid))
1369 dev_info(dev, "FastRPC Session ID not specified in DT\n");
1372 struct fastrpc_session_ctx *dup_sess;
1374 for (i = 1; i < sessions; i++) {
1375 if (cctx->sesscount++ >= FASTRPC_MAX_SESSIONS)
1377 dup_sess = &cctx->session[cctx->sesscount];
1378 memcpy(dup_sess, sess, sizeof(*dup_sess));
1382 spin_unlock_irqrestore(&cctx->lock, flags);
1383 rc = dma_set_mask(dev, DMA_BIT_MASK(32));
1385 dev_err(dev, "32-bit DMA enable failed\n");
1392 static int fastrpc_cb_remove(struct platform_device *pdev)
1394 struct fastrpc_channel_ctx *cctx = dev_get_drvdata(pdev->dev.parent);
1395 struct fastrpc_session_ctx *sess = dev_get_drvdata(&pdev->dev);
1396 unsigned long flags;
1399 spin_lock_irqsave(&cctx->lock, flags);
1400 for (i = 1; i < FASTRPC_MAX_SESSIONS; i++) {
1401 if (cctx->session[i].sid == sess->sid) {
1402 cctx->session[i].valid = false;
1406 spin_unlock_irqrestore(&cctx->lock, flags);
1411 static const struct of_device_id fastrpc_match_table[] = {
1412 { .compatible = "qcom,fastrpc-compute-cb", },
1416 static struct platform_driver fastrpc_cb_driver = {
1417 .probe = fastrpc_cb_probe,
1418 .remove = fastrpc_cb_remove,
1420 .name = "qcom,fastrpc-cb",
1421 .of_match_table = fastrpc_match_table,
1422 .suppress_bind_attrs = true,
1426 static int fastrpc_rpmsg_probe(struct rpmsg_device *rpdev)
1428 struct device *rdev = &rpdev->dev;
1429 struct fastrpc_channel_ctx *data;
1430 int i, err, domain_id = -1;
1433 err = of_property_read_string(rdev->of_node, "label", &domain);
1435 dev_info(rdev, "FastRPC Domain not specified in DT\n");
1439 for (i = 0; i <= CDSP_DOMAIN_ID; i++) {
1440 if (!strcmp(domains[i], domain)) {
1446 if (domain_id < 0) {
1447 dev_info(rdev, "FastRPC Invalid Domain ID %d\n", domain_id);
1451 data = kzalloc(sizeof(*data), GFP_KERNEL);
1455 data->miscdev.minor = MISC_DYNAMIC_MINOR;
1456 data->miscdev.name = kasprintf(GFP_KERNEL, "fastrpc-%s",
1457 domains[domain_id]);
1458 data->miscdev.fops = &fastrpc_fops;
1459 err = misc_register(&data->miscdev);
1463 kref_init(&data->refcount);
1465 dev_set_drvdata(&rpdev->dev, data);
1466 dma_set_mask_and_coherent(rdev, DMA_BIT_MASK(32));
1467 INIT_LIST_HEAD(&data->users);
1468 spin_lock_init(&data->lock);
1469 idr_init(&data->ctx_idr);
1470 data->domain_id = domain_id;
1471 data->rpdev = rpdev;
1473 return of_platform_populate(rdev->of_node, NULL, NULL, rdev);
1476 static void fastrpc_notify_users(struct fastrpc_user *user)
1478 struct fastrpc_invoke_ctx *ctx;
1480 spin_lock(&user->lock);
1481 list_for_each_entry(ctx, &user->pending, node)
1482 complete(&ctx->work);
1483 spin_unlock(&user->lock);
1486 static void fastrpc_rpmsg_remove(struct rpmsg_device *rpdev)
1488 struct fastrpc_channel_ctx *cctx = dev_get_drvdata(&rpdev->dev);
1489 struct fastrpc_user *user;
1490 unsigned long flags;
1492 spin_lock_irqsave(&cctx->lock, flags);
1493 list_for_each_entry(user, &cctx->users, user)
1494 fastrpc_notify_users(user);
1495 spin_unlock_irqrestore(&cctx->lock, flags);
1497 misc_deregister(&cctx->miscdev);
1498 of_platform_depopulate(&rpdev->dev);
1501 fastrpc_channel_ctx_put(cctx);
1504 static int fastrpc_rpmsg_callback(struct rpmsg_device *rpdev, void *data,
1505 int len, void *priv, u32 addr)
1507 struct fastrpc_channel_ctx *cctx = dev_get_drvdata(&rpdev->dev);
1508 struct fastrpc_invoke_rsp *rsp = data;
1509 struct fastrpc_invoke_ctx *ctx;
1510 unsigned long flags;
1511 unsigned long ctxid;
1513 if (len < sizeof(*rsp))
1516 ctxid = ((rsp->ctx & FASTRPC_CTXID_MASK) >> 4);
1518 spin_lock_irqsave(&cctx->lock, flags);
1519 ctx = idr_find(&cctx->ctx_idr, ctxid);
1520 spin_unlock_irqrestore(&cctx->lock, flags);
1523 dev_err(&rpdev->dev, "No context ID matches response\n");
1527 ctx->retval = rsp->retval;
1528 complete(&ctx->work);
1531 * The DMA buffer associated with the context cannot be freed in
1532 * interrupt context so schedule it through a worker thread to
1533 * avoid a kernel BUG.
1535 schedule_work(&ctx->put_work);
1540 static const struct of_device_id fastrpc_rpmsg_of_match[] = {
1541 { .compatible = "qcom,fastrpc" },
1544 MODULE_DEVICE_TABLE(of, fastrpc_rpmsg_of_match);
1546 static struct rpmsg_driver fastrpc_driver = {
1547 .probe = fastrpc_rpmsg_probe,
1548 .remove = fastrpc_rpmsg_remove,
1549 .callback = fastrpc_rpmsg_callback,
1551 .name = "qcom,fastrpc",
1552 .of_match_table = fastrpc_rpmsg_of_match,
1556 static int fastrpc_init(void)
1560 ret = platform_driver_register(&fastrpc_cb_driver);
1562 pr_err("fastrpc: failed to register cb driver\n");
1566 ret = register_rpmsg_driver(&fastrpc_driver);
1568 pr_err("fastrpc: failed to register rpmsg driver\n");
1569 platform_driver_unregister(&fastrpc_cb_driver);
1575 module_init(fastrpc_init);
1577 static void fastrpc_exit(void)
1579 platform_driver_unregister(&fastrpc_cb_driver);
1580 unregister_rpmsg_driver(&fastrpc_driver);
1582 module_exit(fastrpc_exit);
1584 MODULE_LICENSE("GPL v2");