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 (2 * 1024 * 1024)
36 #define FASTRPC_DEVICE_NAME "fastrpc"
37 #define ADSP_MMAP_ADD_PAGES 0x1000
39 /* Retrives number of input buffers from the scalars parameter */
40 #define REMOTE_SCALARS_INBUFS(sc) (((sc) >> 16) & 0x0ff)
42 /* Retrives number of output buffers from the scalars parameter */
43 #define REMOTE_SCALARS_OUTBUFS(sc) (((sc) >> 8) & 0x0ff)
45 /* Retrives number of input handles from the scalars parameter */
46 #define REMOTE_SCALARS_INHANDLES(sc) (((sc) >> 4) & 0x0f)
48 /* Retrives number of output handles from the scalars parameter */
49 #define REMOTE_SCALARS_OUTHANDLES(sc) ((sc) & 0x0f)
51 #define REMOTE_SCALARS_LENGTH(sc) (REMOTE_SCALARS_INBUFS(sc) + \
52 REMOTE_SCALARS_OUTBUFS(sc) + \
53 REMOTE_SCALARS_INHANDLES(sc)+ \
54 REMOTE_SCALARS_OUTHANDLES(sc))
55 #define FASTRPC_BUILD_SCALARS(attr, method, in, out, oin, oout) \
56 (((attr & 0x07) << 29) | \
57 ((method & 0x1f) << 24) | \
58 ((in & 0xff) << 16) | \
59 ((out & 0xff) << 8) | \
60 ((oin & 0x0f) << 4) | \
63 #define FASTRPC_SCALARS(method, in, out) \
64 FASTRPC_BUILD_SCALARS(0, method, in, out, 0, 0)
66 #define FASTRPC_CREATE_PROCESS_NARGS 6
67 /* Remote Method id table */
68 #define FASTRPC_RMID_INIT_ATTACH 0
69 #define FASTRPC_RMID_INIT_RELEASE 1
70 #define FASTRPC_RMID_INIT_MMAP 4
71 #define FASTRPC_RMID_INIT_MUNMAP 5
72 #define FASTRPC_RMID_INIT_CREATE 6
73 #define FASTRPC_RMID_INIT_CREATE_ATTR 7
74 #define FASTRPC_RMID_INIT_CREATE_STATIC 8
76 #define miscdev_to_cctx(d) container_of(d, struct fastrpc_channel_ctx, miscdev)
78 static const char *domains[FASTRPC_DEV_MAX] = { "adsp", "mdsp",
80 struct fastrpc_phy_page {
81 u64 addr; /* physical address */
82 u64 size; /* size of contiguous region */
85 struct fastrpc_invoke_buf {
86 u32 num; /* number of contiguous regions */
87 u32 pgidx; /* index to start of contiguous region */
90 struct fastrpc_remote_arg {
95 struct fastrpc_mmap_rsp_msg {
99 struct fastrpc_mmap_req_msg {
106 struct fastrpc_munmap_req_msg {
113 int pid; /* process group id */
114 int tid; /* thread id */
115 u64 ctx; /* invoke caller context */
116 u32 handle; /* handle to invoke */
117 u32 sc; /* scalars structure describing the data */
118 u64 addr; /* physical address */
119 u64 size; /* size of contiguous region */
122 struct fastrpc_invoke_rsp {
123 u64 ctx; /* invoke caller context */
124 int retval; /* invoke return value */
127 struct fastrpc_buf_overlap {
137 struct fastrpc_user *fl;
138 struct dma_buf *dmabuf;
143 /* Lock for dma buf attachments */
145 struct list_head attachments;
147 struct list_head node; /* list of user requested mmaps */
151 struct fastrpc_dma_buf_attachment {
154 struct list_head node;
158 struct list_head node;
159 struct fastrpc_user *fl;
162 struct sg_table *table;
163 struct dma_buf_attachment *attach;
168 struct kref refcount;
171 struct fastrpc_invoke_ctx {
181 struct kref refcount;
182 struct list_head node; /* list of ctxs */
183 struct completion work;
184 struct work_struct put_work;
185 struct fastrpc_msg msg;
186 struct fastrpc_user *fl;
187 struct fastrpc_remote_arg *rpra;
188 struct fastrpc_map **maps;
189 struct fastrpc_buf *buf;
190 struct fastrpc_invoke_args *args;
191 struct fastrpc_buf_overlap *olaps;
192 struct fastrpc_channel_ctx *cctx;
195 struct fastrpc_session_ctx {
202 struct fastrpc_channel_ctx {
205 struct rpmsg_device *rpdev;
206 struct fastrpc_session_ctx session[FASTRPC_MAX_SESSIONS];
209 struct list_head users;
210 struct miscdevice miscdev;
211 struct kref refcount;
214 struct fastrpc_user {
215 struct list_head user;
216 struct list_head maps;
217 struct list_head pending;
218 struct list_head mmaps;
220 struct fastrpc_channel_ctx *cctx;
221 struct fastrpc_session_ctx *sctx;
222 struct fastrpc_buf *init_mem;
228 /* lock for allocations */
232 static void fastrpc_free_map(struct kref *ref)
234 struct fastrpc_map *map;
236 map = container_of(ref, struct fastrpc_map, refcount);
239 dma_buf_unmap_attachment(map->attach, map->table,
241 dma_buf_detach(map->buf, map->attach);
242 dma_buf_put(map->buf);
248 static void fastrpc_map_put(struct fastrpc_map *map)
251 kref_put(&map->refcount, fastrpc_free_map);
254 static void fastrpc_map_get(struct fastrpc_map *map)
257 kref_get(&map->refcount);
260 static int fastrpc_map_find(struct fastrpc_user *fl, int fd,
261 struct fastrpc_map **ppmap)
263 struct fastrpc_map *map = NULL;
265 mutex_lock(&fl->mutex);
266 list_for_each_entry(map, &fl->maps, node) {
268 fastrpc_map_get(map);
270 mutex_unlock(&fl->mutex);
274 mutex_unlock(&fl->mutex);
279 static void fastrpc_buf_free(struct fastrpc_buf *buf)
281 dma_free_coherent(buf->dev, buf->size, buf->virt,
282 FASTRPC_PHYS(buf->phys));
286 static int fastrpc_buf_alloc(struct fastrpc_user *fl, struct device *dev,
287 u64 size, struct fastrpc_buf **obuf)
289 struct fastrpc_buf *buf;
291 buf = kzalloc(sizeof(*buf), GFP_KERNEL);
295 INIT_LIST_HEAD(&buf->attachments);
296 INIT_LIST_HEAD(&buf->node);
297 mutex_init(&buf->lock);
306 buf->virt = dma_alloc_coherent(dev, buf->size, (dma_addr_t *)&buf->phys,
309 mutex_destroy(&buf->lock);
314 if (fl->sctx && fl->sctx->sid)
315 buf->phys += ((u64)fl->sctx->sid << 32);
322 static void fastrpc_channel_ctx_free(struct kref *ref)
324 struct fastrpc_channel_ctx *cctx;
326 cctx = container_of(ref, struct fastrpc_channel_ctx, refcount);
331 static void fastrpc_channel_ctx_get(struct fastrpc_channel_ctx *cctx)
333 kref_get(&cctx->refcount);
336 static void fastrpc_channel_ctx_put(struct fastrpc_channel_ctx *cctx)
338 kref_put(&cctx->refcount, fastrpc_channel_ctx_free);
341 static void fastrpc_context_free(struct kref *ref)
343 struct fastrpc_invoke_ctx *ctx;
344 struct fastrpc_channel_ctx *cctx;
348 ctx = container_of(ref, struct fastrpc_invoke_ctx, refcount);
351 for (i = 0; i < ctx->nscalars; i++)
352 fastrpc_map_put(ctx->maps[i]);
355 fastrpc_buf_free(ctx->buf);
357 spin_lock_irqsave(&cctx->lock, flags);
358 idr_remove(&cctx->ctx_idr, ctx->ctxid >> 4);
359 spin_unlock_irqrestore(&cctx->lock, flags);
365 fastrpc_channel_ctx_put(cctx);
368 static void fastrpc_context_get(struct fastrpc_invoke_ctx *ctx)
370 kref_get(&ctx->refcount);
373 static void fastrpc_context_put(struct fastrpc_invoke_ctx *ctx)
375 kref_put(&ctx->refcount, fastrpc_context_free);
378 static void fastrpc_context_put_wq(struct work_struct *work)
380 struct fastrpc_invoke_ctx *ctx =
381 container_of(work, struct fastrpc_invoke_ctx, put_work);
383 fastrpc_context_put(ctx);
386 #define CMP(aa, bb) ((aa) == (bb) ? 0 : (aa) < (bb) ? -1 : 1)
387 static int olaps_cmp(const void *a, const void *b)
389 struct fastrpc_buf_overlap *pa = (struct fastrpc_buf_overlap *)a;
390 struct fastrpc_buf_overlap *pb = (struct fastrpc_buf_overlap *)b;
391 /* sort with lowest starting buffer first */
392 int st = CMP(pa->start, pb->start);
393 /* sort with highest ending buffer first */
394 int ed = CMP(pb->end, pa->end);
396 return st == 0 ? ed : st;
399 static void fastrpc_get_buff_overlaps(struct fastrpc_invoke_ctx *ctx)
404 for (i = 0; i < ctx->nbufs; ++i) {
405 ctx->olaps[i].start = ctx->args[i].ptr;
406 ctx->olaps[i].end = ctx->olaps[i].start + ctx->args[i].length;
407 ctx->olaps[i].raix = i;
410 sort(ctx->olaps, ctx->nbufs, sizeof(*ctx->olaps), olaps_cmp, NULL);
412 for (i = 0; i < ctx->nbufs; ++i) {
413 /* Falling inside previous range */
414 if (ctx->olaps[i].start < max_end) {
415 ctx->olaps[i].mstart = max_end;
416 ctx->olaps[i].mend = ctx->olaps[i].end;
417 ctx->olaps[i].offset = max_end - ctx->olaps[i].start;
419 if (ctx->olaps[i].end > max_end) {
420 max_end = ctx->olaps[i].end;
422 ctx->olaps[i].mend = 0;
423 ctx->olaps[i].mstart = 0;
427 ctx->olaps[i].mend = ctx->olaps[i].end;
428 ctx->olaps[i].mstart = ctx->olaps[i].start;
429 ctx->olaps[i].offset = 0;
430 max_end = ctx->olaps[i].end;
435 static struct fastrpc_invoke_ctx *fastrpc_context_alloc(
436 struct fastrpc_user *user, u32 kernel, u32 sc,
437 struct fastrpc_invoke_args *args)
439 struct fastrpc_channel_ctx *cctx = user->cctx;
440 struct fastrpc_invoke_ctx *ctx = NULL;
444 ctx = kzalloc(sizeof(*ctx), GFP_KERNEL);
446 return ERR_PTR(-ENOMEM);
448 INIT_LIST_HEAD(&ctx->node);
450 ctx->nscalars = REMOTE_SCALARS_LENGTH(sc);
451 ctx->nbufs = REMOTE_SCALARS_INBUFS(sc) +
452 REMOTE_SCALARS_OUTBUFS(sc);
455 ctx->maps = kcalloc(ctx->nscalars,
456 sizeof(*ctx->maps), GFP_KERNEL);
459 return ERR_PTR(-ENOMEM);
461 ctx->olaps = kcalloc(ctx->nscalars,
462 sizeof(*ctx->olaps), GFP_KERNEL);
466 return ERR_PTR(-ENOMEM);
469 fastrpc_get_buff_overlaps(ctx);
472 /* Released in fastrpc_context_put() */
473 fastrpc_channel_ctx_get(cctx);
477 ctx->pid = current->pid;
478 ctx->tgid = user->tgid;
480 init_completion(&ctx->work);
481 INIT_WORK(&ctx->put_work, fastrpc_context_put_wq);
483 spin_lock(&user->lock);
484 list_add_tail(&ctx->node, &user->pending);
485 spin_unlock(&user->lock);
487 spin_lock_irqsave(&cctx->lock, flags);
488 ret = idr_alloc_cyclic(&cctx->ctx_idr, ctx, 1,
489 FASTRPC_CTX_MAX, GFP_ATOMIC);
491 spin_unlock_irqrestore(&cctx->lock, flags);
494 ctx->ctxid = ret << 4;
495 spin_unlock_irqrestore(&cctx->lock, flags);
497 kref_init(&ctx->refcount);
501 spin_lock(&user->lock);
502 list_del(&ctx->node);
503 spin_unlock(&user->lock);
504 fastrpc_channel_ctx_put(cctx);
512 static struct sg_table *
513 fastrpc_map_dma_buf(struct dma_buf_attachment *attachment,
514 enum dma_data_direction dir)
516 struct fastrpc_dma_buf_attachment *a = attachment->priv;
517 struct sg_table *table;
521 if (!dma_map_sg(attachment->dev, table->sgl, table->nents, dir))
522 return ERR_PTR(-ENOMEM);
527 static void fastrpc_unmap_dma_buf(struct dma_buf_attachment *attach,
528 struct sg_table *table,
529 enum dma_data_direction dir)
531 dma_unmap_sg(attach->dev, table->sgl, table->nents, dir);
534 static void fastrpc_release(struct dma_buf *dmabuf)
536 struct fastrpc_buf *buffer = dmabuf->priv;
538 fastrpc_buf_free(buffer);
541 static int fastrpc_dma_buf_attach(struct dma_buf *dmabuf,
542 struct dma_buf_attachment *attachment)
544 struct fastrpc_dma_buf_attachment *a;
545 struct fastrpc_buf *buffer = dmabuf->priv;
548 a = kzalloc(sizeof(*a), GFP_KERNEL);
552 ret = dma_get_sgtable(buffer->dev, &a->sgt, buffer->virt,
553 FASTRPC_PHYS(buffer->phys), buffer->size);
555 dev_err(buffer->dev, "failed to get scatterlist from DMA API\n");
560 a->dev = attachment->dev;
561 INIT_LIST_HEAD(&a->node);
562 attachment->priv = a;
564 mutex_lock(&buffer->lock);
565 list_add(&a->node, &buffer->attachments);
566 mutex_unlock(&buffer->lock);
571 static void fastrpc_dma_buf_detatch(struct dma_buf *dmabuf,
572 struct dma_buf_attachment *attachment)
574 struct fastrpc_dma_buf_attachment *a = attachment->priv;
575 struct fastrpc_buf *buffer = dmabuf->priv;
577 mutex_lock(&buffer->lock);
579 mutex_unlock(&buffer->lock);
580 sg_free_table(&a->sgt);
584 static void *fastrpc_kmap(struct dma_buf *dmabuf, unsigned long pgnum)
586 struct fastrpc_buf *buf = dmabuf->priv;
588 return buf->virt ? buf->virt + pgnum * PAGE_SIZE : NULL;
591 static void *fastrpc_vmap(struct dma_buf *dmabuf)
593 struct fastrpc_buf *buf = dmabuf->priv;
598 static int fastrpc_mmap(struct dma_buf *dmabuf,
599 struct vm_area_struct *vma)
601 struct fastrpc_buf *buf = dmabuf->priv;
602 size_t size = vma->vm_end - vma->vm_start;
604 return dma_mmap_coherent(buf->dev, vma, buf->virt,
605 FASTRPC_PHYS(buf->phys), size);
608 static const struct dma_buf_ops fastrpc_dma_buf_ops = {
609 .attach = fastrpc_dma_buf_attach,
610 .detach = fastrpc_dma_buf_detatch,
611 .map_dma_buf = fastrpc_map_dma_buf,
612 .unmap_dma_buf = fastrpc_unmap_dma_buf,
613 .mmap = fastrpc_mmap,
615 .vmap = fastrpc_vmap,
616 .release = fastrpc_release,
619 static int fastrpc_map_create(struct fastrpc_user *fl, int fd,
620 u64 len, struct fastrpc_map **ppmap)
622 struct fastrpc_session_ctx *sess = fl->sctx;
623 struct fastrpc_map *map = NULL;
626 if (!fastrpc_map_find(fl, fd, ppmap))
629 map = kzalloc(sizeof(*map), GFP_KERNEL);
633 INIT_LIST_HEAD(&map->node);
636 map->buf = dma_buf_get(fd);
637 if (IS_ERR(map->buf)) {
638 err = PTR_ERR(map->buf);
642 map->attach = dma_buf_attach(map->buf, sess->dev);
643 if (IS_ERR(map->attach)) {
644 dev_err(sess->dev, "Failed to attach dmabuf\n");
645 err = PTR_ERR(map->attach);
649 map->table = dma_buf_map_attachment(map->attach, DMA_BIDIRECTIONAL);
650 if (IS_ERR(map->table)) {
651 err = PTR_ERR(map->table);
655 map->phys = sg_dma_address(map->table->sgl);
656 map->phys += ((u64)fl->sctx->sid << 32);
658 map->va = sg_virt(map->table->sgl);
660 kref_init(&map->refcount);
662 spin_lock(&fl->lock);
663 list_add_tail(&map->node, &fl->maps);
664 spin_unlock(&fl->lock);
670 dma_buf_detach(map->buf, map->attach);
672 dma_buf_put(map->buf);
680 * Fastrpc payload buffer with metadata looks like:
682 * >>>>>> START of METADATA <<<<<<<<<
683 * +---------------------------------+
685 * | type:(struct fastrpc_remote_arg)|
687 * +---------------------------------+
688 * | Invoke Buffer list |
689 * | type:(struct fastrpc_invoke_buf)|
691 * +---------------------------------+
693 * | type:(struct fastrpc_phy_page) |
695 * +---------------------------------+
697 * |(can be specific to SoC/Firmware)|
698 * +---------------------------------+
699 * >>>>>>>> END of METADATA <<<<<<<<<
700 * +---------------------------------+
703 * +---------------------------------+
706 static int fastrpc_get_meta_size(struct fastrpc_invoke_ctx *ctx)
710 size = (sizeof(struct fastrpc_remote_arg) +
711 sizeof(struct fastrpc_invoke_buf) +
712 sizeof(struct fastrpc_phy_page)) * ctx->nscalars +
713 sizeof(u64) * FASTRPC_MAX_FDLIST +
714 sizeof(u32) * FASTRPC_MAX_CRCLIST;
719 static u64 fastrpc_get_payload_size(struct fastrpc_invoke_ctx *ctx, int metalen)
724 size = ALIGN(metalen, FASTRPC_ALIGN);
725 for (i = 0; i < ctx->nscalars; i++) {
726 if (ctx->args[i].fd == 0 || ctx->args[i].fd == -1) {
728 if (ctx->olaps[i].offset == 0)
729 size = ALIGN(size, FASTRPC_ALIGN);
731 size += (ctx->olaps[i].mend - ctx->olaps[i].mstart);
738 static int fastrpc_create_maps(struct fastrpc_invoke_ctx *ctx)
740 struct device *dev = ctx->fl->sctx->dev;
743 for (i = 0; i < ctx->nscalars; ++i) {
744 /* Make sure reserved field is set to 0 */
745 if (ctx->args[i].reserved)
748 if (ctx->args[i].fd == 0 || ctx->args[i].fd == -1 ||
749 ctx->args[i].length == 0)
752 err = fastrpc_map_create(ctx->fl, ctx->args[i].fd,
753 ctx->args[i].length, &ctx->maps[i]);
755 dev_err(dev, "Error Creating map %d\n", err);
763 static int fastrpc_get_args(u32 kernel, struct fastrpc_invoke_ctx *ctx)
765 struct device *dev = ctx->fl->sctx->dev;
766 struct fastrpc_remote_arg *rpra;
767 struct fastrpc_invoke_buf *list;
768 struct fastrpc_phy_page *pages;
769 int inbufs, i, oix, err = 0;
770 u64 len, rlen, pkt_size;
771 u64 pg_start, pg_end;
775 inbufs = REMOTE_SCALARS_INBUFS(ctx->sc);
776 metalen = fastrpc_get_meta_size(ctx);
777 pkt_size = fastrpc_get_payload_size(ctx, metalen);
779 err = fastrpc_create_maps(ctx);
783 ctx->msg_sz = pkt_size;
785 err = fastrpc_buf_alloc(ctx->fl, dev, pkt_size, &ctx->buf);
789 rpra = ctx->buf->virt;
790 list = ctx->buf->virt + ctx->nscalars * sizeof(*rpra);
791 pages = ctx->buf->virt + ctx->nscalars * (sizeof(*list) +
793 args = (uintptr_t)ctx->buf->virt + metalen;
794 rlen = pkt_size - metalen;
797 for (oix = 0; oix < ctx->nbufs; ++oix) {
800 i = ctx->olaps[oix].raix;
801 len = ctx->args[i].length;
805 list[i].num = len ? 1 : 0;
812 struct vm_area_struct *vma = NULL;
814 rpra[i].pv = (u64) ctx->args[i].ptr;
815 pages[i].addr = ctx->maps[i]->phys;
817 vma = find_vma(current->mm, ctx->args[i].ptr);
819 pages[i].addr += ctx->args[i].ptr -
822 pg_start = (ctx->args[i].ptr & PAGE_MASK) >> PAGE_SHIFT;
823 pg_end = ((ctx->args[i].ptr + len - 1) & PAGE_MASK) >>
825 pages[i].size = (pg_end - pg_start + 1) * PAGE_SIZE;
829 if (ctx->olaps[oix].offset == 0) {
830 rlen -= ALIGN(args, FASTRPC_ALIGN) - args;
831 args = ALIGN(args, FASTRPC_ALIGN);
834 mlen = ctx->olaps[oix].mend - ctx->olaps[oix].mstart;
839 rpra[i].pv = args - ctx->olaps[oix].offset;
840 pages[i].addr = ctx->buf->phys -
841 ctx->olaps[oix].offset +
843 pages[i].addr = pages[i].addr & PAGE_MASK;
845 pg_start = (args & PAGE_MASK) >> PAGE_SHIFT;
846 pg_end = ((args + len - 1) & PAGE_MASK) >> PAGE_SHIFT;
847 pages[i].size = (pg_end - pg_start + 1) * PAGE_SIZE;
852 if (i < inbufs && !ctx->maps[i]) {
853 void *dst = (void *)(uintptr_t)rpra[i].pv;
854 void *src = (void *)(uintptr_t)ctx->args[i].ptr;
857 if (copy_from_user(dst, (void __user *)src,
863 memcpy(dst, src, len);
868 for (i = ctx->nbufs; i < ctx->nscalars; ++i) {
869 rpra[i].pv = (u64) ctx->args[i].ptr;
870 rpra[i].len = ctx->args[i].length;
871 list[i].num = ctx->args[i].length ? 1 : 0;
873 pages[i].addr = ctx->maps[i]->phys;
874 pages[i].size = ctx->maps[i]->size;
879 dev_err(dev, "Error: get invoke args failed:%d\n", err);
884 static int fastrpc_put_args(struct fastrpc_invoke_ctx *ctx,
887 struct fastrpc_remote_arg *rpra = ctx->rpra;
890 inbufs = REMOTE_SCALARS_INBUFS(ctx->sc);
892 for (i = inbufs; i < ctx->nbufs; ++i) {
893 void *src = (void *)(uintptr_t)rpra[i].pv;
894 void *dst = (void *)(uintptr_t)ctx->args[i].ptr;
895 u64 len = rpra[i].len;
898 if (copy_to_user((void __user *)dst, src, len))
901 memcpy(dst, src, len);
908 static int fastrpc_invoke_send(struct fastrpc_session_ctx *sctx,
909 struct fastrpc_invoke_ctx *ctx,
910 u32 kernel, uint32_t handle)
912 struct fastrpc_channel_ctx *cctx;
913 struct fastrpc_user *fl = ctx->fl;
914 struct fastrpc_msg *msg = &ctx->msg;
918 msg->tid = current->pid;
923 msg->ctx = ctx->ctxid | fl->pd;
924 msg->handle = handle;
926 msg->addr = ctx->buf ? ctx->buf->phys : 0;
927 msg->size = roundup(ctx->msg_sz, PAGE_SIZE);
928 fastrpc_context_get(ctx);
930 return rpmsg_send(cctx->rpdev->ept, (void *)msg, sizeof(*msg));
933 static int fastrpc_internal_invoke(struct fastrpc_user *fl, u32 kernel,
935 struct fastrpc_invoke_args *args)
937 struct fastrpc_invoke_ctx *ctx = NULL;
943 if (!fl->cctx->rpdev)
946 ctx = fastrpc_context_alloc(fl, kernel, sc, args);
951 err = fastrpc_get_args(kernel, ctx);
956 /* make sure that all CPU memory writes are seen by DSP */
958 /* Send invoke buffer to remote dsp */
959 err = fastrpc_invoke_send(fl->sctx, ctx, kernel, handle);
964 if (!wait_for_completion_timeout(&ctx->work, 10 * HZ))
967 err = wait_for_completion_interruptible(&ctx->work);
973 /* Check the response from remote dsp */
979 /* make sure that all memory writes by DSP are seen by CPU */
981 /* populate all the output buffers with results */
982 err = fastrpc_put_args(ctx, kernel);
988 if (err != -ERESTARTSYS && err != -ETIMEDOUT) {
989 /* We are done with this compute context */
990 spin_lock(&fl->lock);
991 list_del(&ctx->node);
992 spin_unlock(&fl->lock);
993 fastrpc_context_put(ctx);
996 dev_dbg(fl->sctx->dev, "Error: Invoke Failed %d\n", err);
1001 static int fastrpc_init_create_process(struct fastrpc_user *fl,
1004 struct fastrpc_init_create init;
1005 struct fastrpc_invoke_args *args;
1006 struct fastrpc_phy_page pages[1];
1007 struct fastrpc_map *map = NULL;
1008 struct fastrpc_buf *imem = NULL;
1021 args = kcalloc(FASTRPC_CREATE_PROCESS_NARGS, sizeof(*args), GFP_KERNEL);
1025 if (copy_from_user(&init, argp, sizeof(init))) {
1030 if (init.filelen > INIT_FILELEN_MAX) {
1035 inbuf.pgid = fl->tgid;
1036 inbuf.namelen = strlen(current->comm) + 1;
1037 inbuf.filelen = init.filelen;
1039 inbuf.attrs = init.attrs;
1040 inbuf.siglen = init.siglen;
1043 if (init.filelen && init.filefd) {
1044 err = fastrpc_map_create(fl, init.filefd, init.filelen, &map);
1049 memlen = ALIGN(max(INIT_FILELEN_MAX, (int)init.filelen * 4),
1051 err = fastrpc_buf_alloc(fl, fl->sctx->dev, memlen,
1056 fl->init_mem = imem;
1057 args[0].ptr = (u64)(uintptr_t)&inbuf;
1058 args[0].length = sizeof(inbuf);
1061 args[1].ptr = (u64)(uintptr_t)current->comm;
1062 args[1].length = inbuf.namelen;
1065 args[2].ptr = (u64) init.file;
1066 args[2].length = inbuf.filelen;
1067 args[2].fd = init.filefd;
1069 pages[0].addr = imem->phys;
1070 pages[0].size = imem->size;
1072 args[3].ptr = (u64)(uintptr_t) pages;
1073 args[3].length = 1 * sizeof(*pages);
1076 args[4].ptr = (u64)(uintptr_t)&inbuf.attrs;
1077 args[4].length = sizeof(inbuf.attrs);
1080 args[5].ptr = (u64)(uintptr_t) &inbuf.siglen;
1081 args[5].length = sizeof(inbuf.siglen);
1084 sc = FASTRPC_SCALARS(FASTRPC_RMID_INIT_CREATE, 4, 0);
1086 sc = FASTRPC_SCALARS(FASTRPC_RMID_INIT_CREATE_ATTR, 6, 0);
1088 err = fastrpc_internal_invoke(fl, true, FASTRPC_INIT_HANDLE,
1098 fl->init_mem = NULL;
1099 fastrpc_buf_free(imem);
1102 spin_lock(&fl->lock);
1103 list_del(&map->node);
1104 spin_unlock(&fl->lock);
1105 fastrpc_map_put(map);
1113 static struct fastrpc_session_ctx *fastrpc_session_alloc(
1114 struct fastrpc_channel_ctx *cctx)
1116 struct fastrpc_session_ctx *session = NULL;
1117 unsigned long flags;
1120 spin_lock_irqsave(&cctx->lock, flags);
1121 for (i = 0; i < cctx->sesscount; i++) {
1122 if (!cctx->session[i].used && cctx->session[i].valid) {
1123 cctx->session[i].used = true;
1124 session = &cctx->session[i];
1128 spin_unlock_irqrestore(&cctx->lock, flags);
1133 static void fastrpc_session_free(struct fastrpc_channel_ctx *cctx,
1134 struct fastrpc_session_ctx *session)
1136 unsigned long flags;
1138 spin_lock_irqsave(&cctx->lock, flags);
1139 session->used = false;
1140 spin_unlock_irqrestore(&cctx->lock, flags);
1143 static int fastrpc_release_current_dsp_process(struct fastrpc_user *fl)
1145 struct fastrpc_invoke_args args[1];
1150 args[0].ptr = (u64)(uintptr_t) &tgid;
1151 args[0].length = sizeof(tgid);
1153 args[0].reserved = 0;
1154 sc = FASTRPC_SCALARS(FASTRPC_RMID_INIT_RELEASE, 1, 0);
1156 return fastrpc_internal_invoke(fl, true, FASTRPC_INIT_HANDLE,
1160 static int fastrpc_device_release(struct inode *inode, struct file *file)
1162 struct fastrpc_user *fl = (struct fastrpc_user *)file->private_data;
1163 struct fastrpc_channel_ctx *cctx = fl->cctx;
1164 struct fastrpc_invoke_ctx *ctx, *n;
1165 struct fastrpc_map *map, *m;
1166 struct fastrpc_buf *buf, *b;
1167 unsigned long flags;
1169 fastrpc_release_current_dsp_process(fl);
1171 spin_lock_irqsave(&cctx->lock, flags);
1172 list_del(&fl->user);
1173 spin_unlock_irqrestore(&cctx->lock, flags);
1176 fastrpc_buf_free(fl->init_mem);
1178 list_for_each_entry_safe(ctx, n, &fl->pending, node) {
1179 list_del(&ctx->node);
1180 fastrpc_context_put(ctx);
1183 list_for_each_entry_safe(map, m, &fl->maps, node) {
1184 list_del(&map->node);
1185 fastrpc_map_put(map);
1188 list_for_each_entry_safe(buf, b, &fl->mmaps, node) {
1189 list_del(&buf->node);
1190 fastrpc_buf_free(buf);
1193 fastrpc_session_free(cctx, fl->sctx);
1194 fastrpc_channel_ctx_put(cctx);
1196 mutex_destroy(&fl->mutex);
1198 file->private_data = NULL;
1203 static int fastrpc_device_open(struct inode *inode, struct file *filp)
1205 struct fastrpc_channel_ctx *cctx = miscdev_to_cctx(filp->private_data);
1206 struct fastrpc_user *fl = NULL;
1207 unsigned long flags;
1209 fl = kzalloc(sizeof(*fl), GFP_KERNEL);
1213 /* Released in fastrpc_device_release() */
1214 fastrpc_channel_ctx_get(cctx);
1216 filp->private_data = fl;
1217 spin_lock_init(&fl->lock);
1218 mutex_init(&fl->mutex);
1219 INIT_LIST_HEAD(&fl->pending);
1220 INIT_LIST_HEAD(&fl->maps);
1221 INIT_LIST_HEAD(&fl->mmaps);
1222 INIT_LIST_HEAD(&fl->user);
1223 fl->tgid = current->tgid;
1226 fl->sctx = fastrpc_session_alloc(cctx);
1228 dev_err(&cctx->rpdev->dev, "No session available\n");
1229 mutex_destroy(&fl->mutex);
1235 spin_lock_irqsave(&cctx->lock, flags);
1236 list_add_tail(&fl->user, &cctx->users);
1237 spin_unlock_irqrestore(&cctx->lock, flags);
1242 static int fastrpc_dmabuf_alloc(struct fastrpc_user *fl, char __user *argp)
1244 struct fastrpc_alloc_dma_buf bp;
1245 DEFINE_DMA_BUF_EXPORT_INFO(exp_info);
1246 struct fastrpc_buf *buf = NULL;
1249 if (copy_from_user(&bp, argp, sizeof(bp)))
1252 err = fastrpc_buf_alloc(fl, fl->sctx->dev, bp.size, &buf);
1255 exp_info.ops = &fastrpc_dma_buf_ops;
1256 exp_info.size = bp.size;
1257 exp_info.flags = O_RDWR;
1258 exp_info.priv = buf;
1259 buf->dmabuf = dma_buf_export(&exp_info);
1260 if (IS_ERR(buf->dmabuf)) {
1261 err = PTR_ERR(buf->dmabuf);
1262 fastrpc_buf_free(buf);
1266 bp.fd = dma_buf_fd(buf->dmabuf, O_ACCMODE);
1268 dma_buf_put(buf->dmabuf);
1272 if (copy_to_user(argp, &bp, sizeof(bp))) {
1273 dma_buf_put(buf->dmabuf);
1280 static int fastrpc_init_attach(struct fastrpc_user *fl)
1282 struct fastrpc_invoke_args args[1];
1283 int tgid = fl->tgid;
1286 args[0].ptr = (u64)(uintptr_t) &tgid;
1287 args[0].length = sizeof(tgid);
1289 args[0].reserved = 0;
1290 sc = FASTRPC_SCALARS(FASTRPC_RMID_INIT_ATTACH, 1, 0);
1293 return fastrpc_internal_invoke(fl, true, FASTRPC_INIT_HANDLE,
1297 static int fastrpc_invoke(struct fastrpc_user *fl, char __user *argp)
1299 struct fastrpc_invoke_args *args = NULL;
1300 struct fastrpc_invoke inv;
1304 if (copy_from_user(&inv, argp, sizeof(inv)))
1307 /* nscalars is truncated here to max supported value */
1308 nscalars = REMOTE_SCALARS_LENGTH(inv.sc);
1310 args = kcalloc(nscalars, sizeof(*args), GFP_KERNEL);
1314 if (copy_from_user(args, (void __user *)(uintptr_t)inv.args,
1315 nscalars * sizeof(*args))) {
1321 err = fastrpc_internal_invoke(fl, false, inv.handle, inv.sc, args);
1327 static int fastrpc_req_munmap_impl(struct fastrpc_user *fl,
1328 struct fastrpc_req_munmap *req)
1330 struct fastrpc_invoke_args args[1] = { [0] = { 0 } };
1331 struct fastrpc_buf *buf, *b;
1332 struct fastrpc_munmap_req_msg req_msg;
1333 struct device *dev = fl->sctx->dev;
1337 spin_lock(&fl->lock);
1338 list_for_each_entry_safe(buf, b, &fl->mmaps, node) {
1339 if ((buf->raddr == req->vaddrout) && (buf->size == req->size))
1343 spin_unlock(&fl->lock);
1346 dev_err(dev, "mmap not in list\n");
1350 req_msg.pgid = fl->tgid;
1351 req_msg.size = buf->size;
1352 req_msg.vaddr = buf->raddr;
1354 args[0].ptr = (u64) (uintptr_t) &req_msg;
1355 args[0].length = sizeof(req_msg);
1357 sc = FASTRPC_SCALARS(FASTRPC_RMID_INIT_MUNMAP, 1, 0);
1358 err = fastrpc_internal_invoke(fl, true, FASTRPC_INIT_HANDLE, sc,
1361 dev_dbg(dev, "unmmap\tpt 0x%09lx OK\n", buf->raddr);
1362 spin_lock(&fl->lock);
1363 list_del(&buf->node);
1364 spin_unlock(&fl->lock);
1365 fastrpc_buf_free(buf);
1367 dev_err(dev, "unmmap\tpt 0x%09lx ERROR\n", buf->raddr);
1373 static int fastrpc_req_munmap(struct fastrpc_user *fl, char __user *argp)
1375 struct fastrpc_req_munmap req;
1377 if (copy_from_user(&req, argp, sizeof(req)))
1380 return fastrpc_req_munmap_impl(fl, &req);
1383 static int fastrpc_req_mmap(struct fastrpc_user *fl, char __user *argp)
1385 struct fastrpc_invoke_args args[3] = { [0 ... 2] = { 0 } };
1386 struct fastrpc_buf *buf = NULL;
1387 struct fastrpc_mmap_req_msg req_msg;
1388 struct fastrpc_mmap_rsp_msg rsp_msg;
1389 struct fastrpc_req_munmap req_unmap;
1390 struct fastrpc_phy_page pages;
1391 struct fastrpc_req_mmap req;
1392 struct device *dev = fl->sctx->dev;
1396 if (copy_from_user(&req, argp, sizeof(req)))
1399 if (req.flags != ADSP_MMAP_ADD_PAGES) {
1400 dev_err(dev, "flag not supported 0x%x\n", req.flags);
1405 dev_err(dev, "adding user allocated pages is not supported\n");
1409 err = fastrpc_buf_alloc(fl, fl->sctx->dev, req.size, &buf);
1411 dev_err(dev, "failed to allocate buffer\n");
1415 req_msg.pgid = fl->tgid;
1416 req_msg.flags = req.flags;
1417 req_msg.vaddr = req.vaddrin;
1418 req_msg.num = sizeof(pages);
1420 args[0].ptr = (u64) (uintptr_t) &req_msg;
1421 args[0].length = sizeof(req_msg);
1423 pages.addr = buf->phys;
1424 pages.size = buf->size;
1426 args[1].ptr = (u64) (uintptr_t) &pages;
1427 args[1].length = sizeof(pages);
1429 args[2].ptr = (u64) (uintptr_t) &rsp_msg;
1430 args[2].length = sizeof(rsp_msg);
1432 sc = FASTRPC_SCALARS(FASTRPC_RMID_INIT_MMAP, 2, 1);
1433 err = fastrpc_internal_invoke(fl, true, FASTRPC_INIT_HANDLE, sc,
1436 dev_err(dev, "mmap error (len 0x%08llx)\n", buf->size);
1440 /* update the buffer to be able to deallocate the memory on the DSP */
1441 buf->raddr = (uintptr_t) rsp_msg.vaddr;
1443 /* let the client know the address to use */
1444 req.vaddrout = rsp_msg.vaddr;
1446 spin_lock(&fl->lock);
1447 list_add_tail(&buf->node, &fl->mmaps);
1448 spin_unlock(&fl->lock);
1450 if (copy_to_user((void __user *)argp, &req, sizeof(req))) {
1451 /* unmap the memory and release the buffer */
1452 req_unmap.vaddrout = buf->raddr;
1453 req_unmap.size = buf->size;
1454 fastrpc_req_munmap_impl(fl, &req_unmap);
1458 dev_dbg(dev, "mmap\t\tpt 0x%09lx OK [len 0x%08llx]\n",
1459 buf->raddr, buf->size);
1464 fastrpc_buf_free(buf);
1469 static long fastrpc_device_ioctl(struct file *file, unsigned int cmd,
1472 struct fastrpc_user *fl = (struct fastrpc_user *)file->private_data;
1473 char __user *argp = (char __user *)arg;
1477 case FASTRPC_IOCTL_INVOKE:
1478 err = fastrpc_invoke(fl, argp);
1480 case FASTRPC_IOCTL_INIT_ATTACH:
1481 err = fastrpc_init_attach(fl);
1483 case FASTRPC_IOCTL_INIT_CREATE:
1484 err = fastrpc_init_create_process(fl, argp);
1486 case FASTRPC_IOCTL_ALLOC_DMA_BUFF:
1487 err = fastrpc_dmabuf_alloc(fl, argp);
1489 case FASTRPC_IOCTL_MMAP:
1490 err = fastrpc_req_mmap(fl, argp);
1492 case FASTRPC_IOCTL_MUNMAP:
1493 err = fastrpc_req_munmap(fl, argp);
1503 static const struct file_operations fastrpc_fops = {
1504 .open = fastrpc_device_open,
1505 .release = fastrpc_device_release,
1506 .unlocked_ioctl = fastrpc_device_ioctl,
1507 .compat_ioctl = fastrpc_device_ioctl,
1510 static int fastrpc_cb_probe(struct platform_device *pdev)
1512 struct fastrpc_channel_ctx *cctx;
1513 struct fastrpc_session_ctx *sess;
1514 struct device *dev = &pdev->dev;
1515 int i, sessions = 0;
1516 unsigned long flags;
1519 cctx = dev_get_drvdata(dev->parent);
1523 of_property_read_u32(dev->of_node, "qcom,nsessions", &sessions);
1525 spin_lock_irqsave(&cctx->lock, flags);
1526 sess = &cctx->session[cctx->sesscount];
1530 dev_set_drvdata(dev, sess);
1532 if (of_property_read_u32(dev->of_node, "reg", &sess->sid))
1533 dev_info(dev, "FastRPC Session ID not specified in DT\n");
1536 struct fastrpc_session_ctx *dup_sess;
1538 for (i = 1; i < sessions; i++) {
1539 if (cctx->sesscount++ >= FASTRPC_MAX_SESSIONS)
1541 dup_sess = &cctx->session[cctx->sesscount];
1542 memcpy(dup_sess, sess, sizeof(*dup_sess));
1546 spin_unlock_irqrestore(&cctx->lock, flags);
1547 rc = dma_set_mask(dev, DMA_BIT_MASK(32));
1549 dev_err(dev, "32-bit DMA enable failed\n");
1556 static int fastrpc_cb_remove(struct platform_device *pdev)
1558 struct fastrpc_channel_ctx *cctx = dev_get_drvdata(pdev->dev.parent);
1559 struct fastrpc_session_ctx *sess = dev_get_drvdata(&pdev->dev);
1560 unsigned long flags;
1563 spin_lock_irqsave(&cctx->lock, flags);
1564 for (i = 1; i < FASTRPC_MAX_SESSIONS; i++) {
1565 if (cctx->session[i].sid == sess->sid) {
1566 cctx->session[i].valid = false;
1570 spin_unlock_irqrestore(&cctx->lock, flags);
1575 static const struct of_device_id fastrpc_match_table[] = {
1576 { .compatible = "qcom,fastrpc-compute-cb", },
1580 static struct platform_driver fastrpc_cb_driver = {
1581 .probe = fastrpc_cb_probe,
1582 .remove = fastrpc_cb_remove,
1584 .name = "qcom,fastrpc-cb",
1585 .of_match_table = fastrpc_match_table,
1586 .suppress_bind_attrs = true,
1590 static int fastrpc_rpmsg_probe(struct rpmsg_device *rpdev)
1592 struct device *rdev = &rpdev->dev;
1593 struct fastrpc_channel_ctx *data;
1594 int i, err, domain_id = -1;
1597 err = of_property_read_string(rdev->of_node, "label", &domain);
1599 dev_info(rdev, "FastRPC Domain not specified in DT\n");
1603 for (i = 0; i <= CDSP_DOMAIN_ID; i++) {
1604 if (!strcmp(domains[i], domain)) {
1610 if (domain_id < 0) {
1611 dev_info(rdev, "FastRPC Invalid Domain ID %d\n", domain_id);
1615 data = kzalloc(sizeof(*data), GFP_KERNEL);
1619 data->miscdev.minor = MISC_DYNAMIC_MINOR;
1620 data->miscdev.name = devm_kasprintf(rdev, GFP_KERNEL, "fastrpc-%s",
1621 domains[domain_id]);
1622 data->miscdev.fops = &fastrpc_fops;
1623 err = misc_register(&data->miscdev);
1627 kref_init(&data->refcount);
1629 dev_set_drvdata(&rpdev->dev, data);
1630 dma_set_mask_and_coherent(rdev, DMA_BIT_MASK(32));
1631 INIT_LIST_HEAD(&data->users);
1632 spin_lock_init(&data->lock);
1633 idr_init(&data->ctx_idr);
1634 data->domain_id = domain_id;
1635 data->rpdev = rpdev;
1637 return of_platform_populate(rdev->of_node, NULL, NULL, rdev);
1640 static void fastrpc_notify_users(struct fastrpc_user *user)
1642 struct fastrpc_invoke_ctx *ctx;
1644 spin_lock(&user->lock);
1645 list_for_each_entry(ctx, &user->pending, node)
1646 complete(&ctx->work);
1647 spin_unlock(&user->lock);
1650 static void fastrpc_rpmsg_remove(struct rpmsg_device *rpdev)
1652 struct fastrpc_channel_ctx *cctx = dev_get_drvdata(&rpdev->dev);
1653 struct fastrpc_user *user;
1654 unsigned long flags;
1656 spin_lock_irqsave(&cctx->lock, flags);
1657 list_for_each_entry(user, &cctx->users, user)
1658 fastrpc_notify_users(user);
1659 spin_unlock_irqrestore(&cctx->lock, flags);
1661 misc_deregister(&cctx->miscdev);
1662 of_platform_depopulate(&rpdev->dev);
1665 fastrpc_channel_ctx_put(cctx);
1668 static int fastrpc_rpmsg_callback(struct rpmsg_device *rpdev, void *data,
1669 int len, void *priv, u32 addr)
1671 struct fastrpc_channel_ctx *cctx = dev_get_drvdata(&rpdev->dev);
1672 struct fastrpc_invoke_rsp *rsp = data;
1673 struct fastrpc_invoke_ctx *ctx;
1674 unsigned long flags;
1675 unsigned long ctxid;
1677 if (len < sizeof(*rsp))
1680 ctxid = ((rsp->ctx & FASTRPC_CTXID_MASK) >> 4);
1682 spin_lock_irqsave(&cctx->lock, flags);
1683 ctx = idr_find(&cctx->ctx_idr, ctxid);
1684 spin_unlock_irqrestore(&cctx->lock, flags);
1687 dev_err(&rpdev->dev, "No context ID matches response\n");
1691 ctx->retval = rsp->retval;
1692 complete(&ctx->work);
1695 * The DMA buffer associated with the context cannot be freed in
1696 * interrupt context so schedule it through a worker thread to
1697 * avoid a kernel BUG.
1699 schedule_work(&ctx->put_work);
1704 static const struct of_device_id fastrpc_rpmsg_of_match[] = {
1705 { .compatible = "qcom,fastrpc" },
1708 MODULE_DEVICE_TABLE(of, fastrpc_rpmsg_of_match);
1710 static struct rpmsg_driver fastrpc_driver = {
1711 .probe = fastrpc_rpmsg_probe,
1712 .remove = fastrpc_rpmsg_remove,
1713 .callback = fastrpc_rpmsg_callback,
1715 .name = "qcom,fastrpc",
1716 .of_match_table = fastrpc_rpmsg_of_match,
1720 static int fastrpc_init(void)
1724 ret = platform_driver_register(&fastrpc_cb_driver);
1726 pr_err("fastrpc: failed to register cb driver\n");
1730 ret = register_rpmsg_driver(&fastrpc_driver);
1732 pr_err("fastrpc: failed to register rpmsg driver\n");
1733 platform_driver_unregister(&fastrpc_cb_driver);
1739 module_init(fastrpc_init);
1741 static void fastrpc_exit(void)
1743 platform_driver_unregister(&fastrpc_cb_driver);
1744 unregister_rpmsg_driver(&fastrpc_driver);
1746 module_exit(fastrpc_exit);
1748 MODULE_LICENSE("GPL v2");