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1// SPDX-License-Identifier: GPL-2.0
2// Copyright (c) 2011-2018, The Linux Foundation. All rights reserved.
3// Copyright (c) 2018, Linaro Limited
4
5#include <linux/completion.h>
6#include <linux/device.h>
7#include <linux/dma-buf.h>
8#include <linux/dma-mapping.h>
9#include <linux/idr.h>
10#include <linux/list.h>
11#include <linux/miscdevice.h>
12#include <linux/module.h>
13#include <linux/of_address.h>
14#include <linux/of.h>
15#include <linux/sort.h>
16#include <linux/of_platform.h>
17#include <linux/rpmsg.h>
18#include <linux/scatterlist.h>
19#include <linux/slab.h>
20#include <uapi/misc/fastrpc.h>
21
22#define ADSP_DOMAIN_ID (0)
23#define MDSP_DOMAIN_ID (1)
24#define SDSP_DOMAIN_ID (2)
25#define CDSP_DOMAIN_ID (3)
26#define FASTRPC_DEV_MAX 4 /* adsp, mdsp, slpi, cdsp*/
27#define FASTRPC_MAX_SESSIONS 9 /*8 compute, 1 cpz*/
28#define FASTRPC_ALIGN 128
29#define FASTRPC_MAX_FDLIST 16
30#define FASTRPC_MAX_CRCLIST 64
31#define FASTRPC_PHYS(p) ((p) & 0xffffffff)
32#define FASTRPC_CTX_MAX (256)
33#define FASTRPC_INIT_HANDLE 1
34#define FASTRPC_CTXID_MASK (0xFF0)
35#define INIT_FILELEN_MAX (2 * 1024 * 1024)
36#define FASTRPC_DEVICE_NAME "fastrpc"
37#define ADSP_MMAP_ADD_PAGES 0x1000
38
39/* Retrives number of input buffers from the scalars parameter */
40#define REMOTE_SCALARS_INBUFS(sc) (((sc) >> 16) & 0x0ff)
41
42/* Retrives number of output buffers from the scalars parameter */
43#define REMOTE_SCALARS_OUTBUFS(sc) (((sc) >> 8) & 0x0ff)
44
45/* Retrives number of input handles from the scalars parameter */
46#define REMOTE_SCALARS_INHANDLES(sc) (((sc) >> 4) & 0x0f)
47
48/* Retrives number of output handles from the scalars parameter */
49#define REMOTE_SCALARS_OUTHANDLES(sc) ((sc) & 0x0f)
50
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) | \
61 (oout & 0x0f))
62
63#define FASTRPC_SCALARS(method, in, out) \
64 FASTRPC_BUILD_SCALARS(0, method, in, out, 0, 0)
65
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
75
76/* Protection Domain(PD) ids */
77#define AUDIO_PD (0) /* also GUEST_OS PD? */
78#define USER_PD (1)
79#define SENSORS_PD (2)
80
81#define miscdev_to_cctx(d) container_of(d, struct fastrpc_channel_ctx, miscdev)
82
83static const char *domains[FASTRPC_DEV_MAX] = { "adsp", "mdsp",
84 "sdsp", "cdsp"};
85struct fastrpc_phy_page {
86 u64 addr; /* physical address */
87 u64 size; /* size of contiguous region */
88};
89
90struct fastrpc_invoke_buf {
91 u32 num; /* number of contiguous regions */
92 u32 pgidx; /* index to start of contiguous region */
93};
94
95struct fastrpc_remote_arg {
96 u64 pv;
97 u64 len;
98};
99
100struct fastrpc_mmap_rsp_msg {
101 u64 vaddr;
102};
103
104struct fastrpc_mmap_req_msg {
105 s32 pgid;
106 u32 flags;
107 u64 vaddr;
108 s32 num;
109};
110
111struct fastrpc_munmap_req_msg {
112 s32 pgid;
113 u64 vaddr;
114 u64 size;
115};
116
117struct fastrpc_msg {
118 int pid; /* process group id */
119 int tid; /* thread id */
120 u64 ctx; /* invoke caller context */
121 u32 handle; /* handle to invoke */
122 u32 sc; /* scalars structure describing the data */
123 u64 addr; /* physical address */
124 u64 size; /* size of contiguous region */
125};
126
127struct fastrpc_invoke_rsp {
128 u64 ctx; /* invoke caller context */
129 int retval; /* invoke return value */
130};
131
132struct fastrpc_buf_overlap {
133 u64 start;
134 u64 end;
135 int raix;
136 u64 mstart;
137 u64 mend;
138 u64 offset;
139};
140
141struct fastrpc_buf {
142 struct fastrpc_user *fl;
143 struct dma_buf *dmabuf;
144 struct device *dev;
145 void *virt;
146 u64 phys;
147 u64 size;
148 /* Lock for dma buf attachments */
149 struct mutex lock;
150 struct list_head attachments;
151 /* mmap support */
152 struct list_head node; /* list of user requested mmaps */
153 uintptr_t raddr;
154};
155
156struct fastrpc_dma_buf_attachment {
157 struct device *dev;
158 struct sg_table sgt;
159 struct list_head node;
160};
161
162struct fastrpc_map {
163 struct list_head node;
164 struct fastrpc_user *fl;
165 int fd;
166 struct dma_buf *buf;
167 struct sg_table *table;
168 struct dma_buf_attachment *attach;
169 u64 phys;
170 u64 size;
171 void *va;
172 u64 len;
173 struct kref refcount;
174};
175
176struct fastrpc_invoke_ctx {
177 int nscalars;
178 int nbufs;
179 int retval;
180 int pid;
181 int tgid;
182 u32 sc;
183 u32 *crc;
184 u64 ctxid;
185 u64 msg_sz;
186 struct kref refcount;
187 struct list_head node; /* list of ctxs */
188 struct completion work;
189 struct work_struct put_work;
190 struct fastrpc_msg msg;
191 struct fastrpc_user *fl;
192 struct fastrpc_remote_arg *rpra;
193 struct fastrpc_map **maps;
194 struct fastrpc_buf *buf;
195 struct fastrpc_invoke_args *args;
196 struct fastrpc_buf_overlap *olaps;
197 struct fastrpc_channel_ctx *cctx;
198};
199
200struct fastrpc_session_ctx {
201 struct device *dev;
202 int sid;
203 bool used;
204 bool valid;
205};
206
207struct fastrpc_channel_ctx {
208 int domain_id;
209 int sesscount;
210 struct rpmsg_device *rpdev;
211 struct fastrpc_session_ctx session[FASTRPC_MAX_SESSIONS];
212 spinlock_t lock;
213 struct idr ctx_idr;
214 struct list_head users;
215 struct miscdevice miscdev;
216 struct kref refcount;
217};
218
219struct fastrpc_user {
220 struct list_head user;
221 struct list_head maps;
222 struct list_head pending;
223 struct list_head mmaps;
224
225 struct fastrpc_channel_ctx *cctx;
226 struct fastrpc_session_ctx *sctx;
227 struct fastrpc_buf *init_mem;
228
229 int tgid;
230 int pd;
231 /* Lock for lists */
232 spinlock_t lock;
233 /* lock for allocations */
234 struct mutex mutex;
235};
236
237static void fastrpc_free_map(struct kref *ref)
238{
239 struct fastrpc_map *map;
240
241 map = container_of(ref, struct fastrpc_map, refcount);
242
243 if (map->table) {
244 dma_buf_unmap_attachment(map->attach, map->table,
245 DMA_BIDIRECTIONAL);
246 dma_buf_detach(map->buf, map->attach);
247 dma_buf_put(map->buf);
248 }
249
250 kfree(map);
251}
252
253static void fastrpc_map_put(struct fastrpc_map *map)
254{
255 if (map)
256 kref_put(&map->refcount, fastrpc_free_map);
257}
258
259static void fastrpc_map_get(struct fastrpc_map *map)
260{
261 if (map)
262 kref_get(&map->refcount);
263}
264
265static int fastrpc_map_find(struct fastrpc_user *fl, int fd,
266 struct fastrpc_map **ppmap)
267{
268 struct fastrpc_map *map = NULL;
269
270 mutex_lock(&fl->mutex);
271 list_for_each_entry(map, &fl->maps, node) {
272 if (map->fd == fd) {
273 fastrpc_map_get(map);
274 *ppmap = map;
275 mutex_unlock(&fl->mutex);
276 return 0;
277 }
278 }
279 mutex_unlock(&fl->mutex);
280
281 return -ENOENT;
282}
283
284static void fastrpc_buf_free(struct fastrpc_buf *buf)
285{
286 dma_free_coherent(buf->dev, buf->size, buf->virt,
287 FASTRPC_PHYS(buf->phys));
288 kfree(buf);
289}
290
291static int fastrpc_buf_alloc(struct fastrpc_user *fl, struct device *dev,
292 u64 size, struct fastrpc_buf **obuf)
293{
294 struct fastrpc_buf *buf;
295
296 buf = kzalloc(sizeof(*buf), GFP_KERNEL);
297 if (!buf)
298 return -ENOMEM;
299
300 INIT_LIST_HEAD(&buf->attachments);
301 INIT_LIST_HEAD(&buf->node);
302 mutex_init(&buf->lock);
303
304 buf->fl = fl;
305 buf->virt = NULL;
306 buf->phys = 0;
307 buf->size = size;
308 buf->dev = dev;
309 buf->raddr = 0;
310
311 buf->virt = dma_alloc_coherent(dev, buf->size, (dma_addr_t *)&buf->phys,
312 GFP_KERNEL);
313 if (!buf->virt) {
314 mutex_destroy(&buf->lock);
315 kfree(buf);
316 return -ENOMEM;
317 }
318
319 if (fl->sctx && fl->sctx->sid)
320 buf->phys += ((u64)fl->sctx->sid << 32);
321
322 *obuf = buf;
323
324 return 0;
325}
326
327static void fastrpc_channel_ctx_free(struct kref *ref)
328{
329 struct fastrpc_channel_ctx *cctx;
330
331 cctx = container_of(ref, struct fastrpc_channel_ctx, refcount);
332
333 kfree(cctx);
334}
335
336static void fastrpc_channel_ctx_get(struct fastrpc_channel_ctx *cctx)
337{
338 kref_get(&cctx->refcount);
339}
340
341static void fastrpc_channel_ctx_put(struct fastrpc_channel_ctx *cctx)
342{
343 kref_put(&cctx->refcount, fastrpc_channel_ctx_free);
344}
345
346static void fastrpc_context_free(struct kref *ref)
347{
348 struct fastrpc_invoke_ctx *ctx;
349 struct fastrpc_channel_ctx *cctx;
350 unsigned long flags;
351 int i;
352
353 ctx = container_of(ref, struct fastrpc_invoke_ctx, refcount);
354 cctx = ctx->cctx;
355
356 for (i = 0; i < ctx->nscalars; i++)
357 fastrpc_map_put(ctx->maps[i]);
358
359 if (ctx->buf)
360 fastrpc_buf_free(ctx->buf);
361
362 spin_lock_irqsave(&cctx->lock, flags);
363 idr_remove(&cctx->ctx_idr, ctx->ctxid >> 4);
364 spin_unlock_irqrestore(&cctx->lock, flags);
365
366 kfree(ctx->maps);
367 kfree(ctx->olaps);
368 kfree(ctx);
369
370 fastrpc_channel_ctx_put(cctx);
371}
372
373static void fastrpc_context_get(struct fastrpc_invoke_ctx *ctx)
374{
375 kref_get(&ctx->refcount);
376}
377
378static void fastrpc_context_put(struct fastrpc_invoke_ctx *ctx)
379{
380 kref_put(&ctx->refcount, fastrpc_context_free);
381}
382
383static void fastrpc_context_put_wq(struct work_struct *work)
384{
385 struct fastrpc_invoke_ctx *ctx =
386 container_of(work, struct fastrpc_invoke_ctx, put_work);
387
388 fastrpc_context_put(ctx);
389}
390
391#define CMP(aa, bb) ((aa) == (bb) ? 0 : (aa) < (bb) ? -1 : 1)
392static int olaps_cmp(const void *a, const void *b)
393{
394 struct fastrpc_buf_overlap *pa = (struct fastrpc_buf_overlap *)a;
395 struct fastrpc_buf_overlap *pb = (struct fastrpc_buf_overlap *)b;
396 /* sort with lowest starting buffer first */
397 int st = CMP(pa->start, pb->start);
398 /* sort with highest ending buffer first */
399 int ed = CMP(pb->end, pa->end);
400
401 return st == 0 ? ed : st;
402}
403
404static void fastrpc_get_buff_overlaps(struct fastrpc_invoke_ctx *ctx)
405{
406 u64 max_end = 0;
407 int i;
408
409 for (i = 0; i < ctx->nbufs; ++i) {
410 ctx->olaps[i].start = ctx->args[i].ptr;
411 ctx->olaps[i].end = ctx->olaps[i].start + ctx->args[i].length;
412 ctx->olaps[i].raix = i;
413 }
414
415 sort(ctx->olaps, ctx->nbufs, sizeof(*ctx->olaps), olaps_cmp, NULL);
416
417 for (i = 0; i < ctx->nbufs; ++i) {
418 /* Falling inside previous range */
419 if (ctx->olaps[i].start < max_end) {
420 ctx->olaps[i].mstart = max_end;
421 ctx->olaps[i].mend = ctx->olaps[i].end;
422 ctx->olaps[i].offset = max_end - ctx->olaps[i].start;
423
424 if (ctx->olaps[i].end > max_end) {
425 max_end = ctx->olaps[i].end;
426 } else {
427 ctx->olaps[i].mend = 0;
428 ctx->olaps[i].mstart = 0;
429 }
430
431 } else {
432 ctx->olaps[i].mend = ctx->olaps[i].end;
433 ctx->olaps[i].mstart = ctx->olaps[i].start;
434 ctx->olaps[i].offset = 0;
435 max_end = ctx->olaps[i].end;
436 }
437 }
438}
439
440static struct fastrpc_invoke_ctx *fastrpc_context_alloc(
441 struct fastrpc_user *user, u32 kernel, u32 sc,
442 struct fastrpc_invoke_args *args)
443{
444 struct fastrpc_channel_ctx *cctx = user->cctx;
445 struct fastrpc_invoke_ctx *ctx = NULL;
446 unsigned long flags;
447 int ret;
448
449 ctx = kzalloc(sizeof(*ctx), GFP_KERNEL);
450 if (!ctx)
451 return ERR_PTR(-ENOMEM);
452
453 INIT_LIST_HEAD(&ctx->node);
454 ctx->fl = user;
455 ctx->nscalars = REMOTE_SCALARS_LENGTH(sc);
456 ctx->nbufs = REMOTE_SCALARS_INBUFS(sc) +
457 REMOTE_SCALARS_OUTBUFS(sc);
458
459 if (ctx->nscalars) {
460 ctx->maps = kcalloc(ctx->nscalars,
461 sizeof(*ctx->maps), GFP_KERNEL);
462 if (!ctx->maps) {
463 kfree(ctx);
464 return ERR_PTR(-ENOMEM);
465 }
466 ctx->olaps = kcalloc(ctx->nscalars,
467 sizeof(*ctx->olaps), GFP_KERNEL);
468 if (!ctx->olaps) {
469 kfree(ctx->maps);
470 kfree(ctx);
471 return ERR_PTR(-ENOMEM);
472 }
473 ctx->args = args;
474 fastrpc_get_buff_overlaps(ctx);
475 }
476
477 /* Released in fastrpc_context_put() */
478 fastrpc_channel_ctx_get(cctx);
479
480 ctx->sc = sc;
481 ctx->retval = -1;
482 ctx->pid = current->pid;
483 ctx->tgid = user->tgid;
484 ctx->cctx = cctx;
485 init_completion(&ctx->work);
486 INIT_WORK(&ctx->put_work, fastrpc_context_put_wq);
487
488 spin_lock(&user->lock);
489 list_add_tail(&ctx->node, &user->pending);
490 spin_unlock(&user->lock);
491
492 spin_lock_irqsave(&cctx->lock, flags);
493 ret = idr_alloc_cyclic(&cctx->ctx_idr, ctx, 1,
494 FASTRPC_CTX_MAX, GFP_ATOMIC);
495 if (ret < 0) {
496 spin_unlock_irqrestore(&cctx->lock, flags);
497 goto err_idr;
498 }
499 ctx->ctxid = ret << 4;
500 spin_unlock_irqrestore(&cctx->lock, flags);
501
502 kref_init(&ctx->refcount);
503
504 return ctx;
505err_idr:
506 spin_lock(&user->lock);
507 list_del(&ctx->node);
508 spin_unlock(&user->lock);
509 fastrpc_channel_ctx_put(cctx);
510 kfree(ctx->maps);
511 kfree(ctx->olaps);
512 kfree(ctx);
513
514 return ERR_PTR(ret);
515}
516
517static struct sg_table *
518fastrpc_map_dma_buf(struct dma_buf_attachment *attachment,
519 enum dma_data_direction dir)
520{
521 struct fastrpc_dma_buf_attachment *a = attachment->priv;
522 struct sg_table *table;
523 int ret;
524
525 table = &a->sgt;
526
527 ret = dma_map_sgtable(attachment->dev, table, dir, 0);
528 if (ret)
529 table = ERR_PTR(ret);
530 return table;
531}
532
533static void fastrpc_unmap_dma_buf(struct dma_buf_attachment *attach,
534 struct sg_table *table,
535 enum dma_data_direction dir)
536{
537 dma_unmap_sgtable(attach->dev, table, dir, 0);
538}
539
540static void fastrpc_release(struct dma_buf *dmabuf)
541{
542 struct fastrpc_buf *buffer = dmabuf->priv;
543
544 fastrpc_buf_free(buffer);
545}
546
547static int fastrpc_dma_buf_attach(struct dma_buf *dmabuf,
548 struct dma_buf_attachment *attachment)
549{
550 struct fastrpc_dma_buf_attachment *a;
551 struct fastrpc_buf *buffer = dmabuf->priv;
552 int ret;
553
554 a = kzalloc(sizeof(*a), GFP_KERNEL);
555 if (!a)
556 return -ENOMEM;
557
558 ret = dma_get_sgtable(buffer->dev, &a->sgt, buffer->virt,
559 FASTRPC_PHYS(buffer->phys), buffer->size);
560 if (ret < 0) {
561 dev_err(buffer->dev, "failed to get scatterlist from DMA API\n");
562 kfree(a);
563 return -EINVAL;
564 }
565
566 a->dev = attachment->dev;
567 INIT_LIST_HEAD(&a->node);
568 attachment->priv = a;
569
570 mutex_lock(&buffer->lock);
571 list_add(&a->node, &buffer->attachments);
572 mutex_unlock(&buffer->lock);
573
574 return 0;
575}
576
577static void fastrpc_dma_buf_detatch(struct dma_buf *dmabuf,
578 struct dma_buf_attachment *attachment)
579{
580 struct fastrpc_dma_buf_attachment *a = attachment->priv;
581 struct fastrpc_buf *buffer = dmabuf->priv;
582
583 mutex_lock(&buffer->lock);
584 list_del(&a->node);
585 mutex_unlock(&buffer->lock);
586 sg_free_table(&a->sgt);
587 kfree(a);
588}
589
590static int fastrpc_vmap(struct dma_buf *dmabuf, struct dma_buf_map *map)
591{
592 struct fastrpc_buf *buf = dmabuf->priv;
593
594 dma_buf_map_set_vaddr(map, buf->virt);
595
596 return 0;
597}
598
599static int fastrpc_mmap(struct dma_buf *dmabuf,
600 struct vm_area_struct *vma)
601{
602 struct fastrpc_buf *buf = dmabuf->priv;
603 size_t size = vma->vm_end - vma->vm_start;
604
605 return dma_mmap_coherent(buf->dev, vma, buf->virt,
606 FASTRPC_PHYS(buf->phys), size);
607}
608
609static const struct dma_buf_ops fastrpc_dma_buf_ops = {
610 .attach = fastrpc_dma_buf_attach,
611 .detach = fastrpc_dma_buf_detatch,
612 .map_dma_buf = fastrpc_map_dma_buf,
613 .unmap_dma_buf = fastrpc_unmap_dma_buf,
614 .mmap = fastrpc_mmap,
615 .vmap = fastrpc_vmap,
616 .release = fastrpc_release,
617};
618
619static int fastrpc_map_create(struct fastrpc_user *fl, int fd,
620 u64 len, struct fastrpc_map **ppmap)
621{
622 struct fastrpc_session_ctx *sess = fl->sctx;
623 struct fastrpc_map *map = NULL;
624 int err = 0;
625
626 if (!fastrpc_map_find(fl, fd, ppmap))
627 return 0;
628
629 map = kzalloc(sizeof(*map), GFP_KERNEL);
630 if (!map)
631 return -ENOMEM;
632
633 INIT_LIST_HEAD(&map->node);
634 map->fl = fl;
635 map->fd = fd;
636 map->buf = dma_buf_get(fd);
637 if (IS_ERR(map->buf)) {
638 err = PTR_ERR(map->buf);
639 goto get_err;
640 }
641
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);
646 goto attach_err;
647 }
648
649 map->table = dma_buf_map_attachment(map->attach, DMA_BIDIRECTIONAL);
650 if (IS_ERR(map->table)) {
651 err = PTR_ERR(map->table);
652 goto map_err;
653 }
654
655 map->phys = sg_dma_address(map->table->sgl);
656 map->phys += ((u64)fl->sctx->sid << 32);
657 map->size = len;
658 map->va = sg_virt(map->table->sgl);
659 map->len = len;
660 kref_init(&map->refcount);
661
662 spin_lock(&fl->lock);
663 list_add_tail(&map->node, &fl->maps);
664 spin_unlock(&fl->lock);
665 *ppmap = map;
666
667 return 0;
668
669map_err:
670 dma_buf_detach(map->buf, map->attach);
671attach_err:
672 dma_buf_put(map->buf);
673get_err:
674 kfree(map);
675
676 return err;
677}
678
679/*
680 * Fastrpc payload buffer with metadata looks like:
681 *
682 * >>>>>> START of METADATA <<<<<<<<<
683 * +---------------------------------+
684 * | Arguments |
685 * | type:(struct fastrpc_remote_arg)|
686 * | (0 - N) |
687 * +---------------------------------+
688 * | Invoke Buffer list |
689 * | type:(struct fastrpc_invoke_buf)|
690 * | (0 - N) |
691 * +---------------------------------+
692 * | Page info list |
693 * | type:(struct fastrpc_phy_page) |
694 * | (0 - N) |
695 * +---------------------------------+
696 * | Optional info |
697 * |(can be specific to SoC/Firmware)|
698 * +---------------------------------+
699 * >>>>>>>> END of METADATA <<<<<<<<<
700 * +---------------------------------+
701 * | Inline ARGS |
702 * | (0-N) |
703 * +---------------------------------+
704 */
705
706static int fastrpc_get_meta_size(struct fastrpc_invoke_ctx *ctx)
707{
708 int size = 0;
709
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;
715
716 return size;
717}
718
719static u64 fastrpc_get_payload_size(struct fastrpc_invoke_ctx *ctx, int metalen)
720{
721 u64 size = 0;
722 int i;
723
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) {
727
728 if (ctx->olaps[i].offset == 0)
729 size = ALIGN(size, FASTRPC_ALIGN);
730
731 size += (ctx->olaps[i].mend - ctx->olaps[i].mstart);
732 }
733 }
734
735 return size;
736}
737
738static int fastrpc_create_maps(struct fastrpc_invoke_ctx *ctx)
739{
740 struct device *dev = ctx->fl->sctx->dev;
741 int i, err;
742
743 for (i = 0; i < ctx->nscalars; ++i) {
744 /* Make sure reserved field is set to 0 */
745 if (ctx->args[i].reserved)
746 return -EINVAL;
747
748 if (ctx->args[i].fd == 0 || ctx->args[i].fd == -1 ||
749 ctx->args[i].length == 0)
750 continue;
751
752 err = fastrpc_map_create(ctx->fl, ctx->args[i].fd,
753 ctx->args[i].length, &ctx->maps[i]);
754 if (err) {
755 dev_err(dev, "Error Creating map %d\n", err);
756 return -EINVAL;
757 }
758
759 }
760 return 0;
761}
762
763static int fastrpc_get_args(u32 kernel, struct fastrpc_invoke_ctx *ctx)
764{
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;
772 uintptr_t args;
773 int metalen;
774
775 inbufs = REMOTE_SCALARS_INBUFS(ctx->sc);
776 metalen = fastrpc_get_meta_size(ctx);
777 pkt_size = fastrpc_get_payload_size(ctx, metalen);
778
779 err = fastrpc_create_maps(ctx);
780 if (err)
781 return err;
782
783 ctx->msg_sz = pkt_size;
784
785 err = fastrpc_buf_alloc(ctx->fl, dev, pkt_size, &ctx->buf);
786 if (err)
787 return err;
788
789 rpra = ctx->buf->virt;
790 list = ctx->buf->virt + ctx->nscalars * sizeof(*rpra);
791 pages = ctx->buf->virt + ctx->nscalars * (sizeof(*list) +
792 sizeof(*rpra));
793 args = (uintptr_t)ctx->buf->virt + metalen;
794 rlen = pkt_size - metalen;
795 ctx->rpra = rpra;
796
797 for (oix = 0; oix < ctx->nbufs; ++oix) {
798 int mlen;
799
800 i = ctx->olaps[oix].raix;
801 len = ctx->args[i].length;
802
803 rpra[i].pv = 0;
804 rpra[i].len = len;
805 list[i].num = len ? 1 : 0;
806 list[i].pgidx = i;
807
808 if (!len)
809 continue;
810
811 if (ctx->maps[i]) {
812 struct vm_area_struct *vma = NULL;
813
814 rpra[i].pv = (u64) ctx->args[i].ptr;
815 pages[i].addr = ctx->maps[i]->phys;
816
817 mmap_read_lock(current->mm);
818 vma = find_vma(current->mm, ctx->args[i].ptr);
819 if (vma)
820 pages[i].addr += ctx->args[i].ptr -
821 vma->vm_start;
822 mmap_read_unlock(current->mm);
823
824 pg_start = (ctx->args[i].ptr & PAGE_MASK) >> PAGE_SHIFT;
825 pg_end = ((ctx->args[i].ptr + len - 1) & PAGE_MASK) >>
826 PAGE_SHIFT;
827 pages[i].size = (pg_end - pg_start + 1) * PAGE_SIZE;
828
829 } else {
830
831 if (ctx->olaps[oix].offset == 0) {
832 rlen -= ALIGN(args, FASTRPC_ALIGN) - args;
833 args = ALIGN(args, FASTRPC_ALIGN);
834 }
835
836 mlen = ctx->olaps[oix].mend - ctx->olaps[oix].mstart;
837
838 if (rlen < mlen)
839 goto bail;
840
841 rpra[i].pv = args - ctx->olaps[oix].offset;
842 pages[i].addr = ctx->buf->phys -
843 ctx->olaps[oix].offset +
844 (pkt_size - rlen);
845 pages[i].addr = pages[i].addr & PAGE_MASK;
846
847 pg_start = (args & PAGE_MASK) >> PAGE_SHIFT;
848 pg_end = ((args + len - 1) & PAGE_MASK) >> PAGE_SHIFT;
849 pages[i].size = (pg_end - pg_start + 1) * PAGE_SIZE;
850 args = args + mlen;
851 rlen -= mlen;
852 }
853
854 if (i < inbufs && !ctx->maps[i]) {
855 void *dst = (void *)(uintptr_t)rpra[i].pv;
856 void *src = (void *)(uintptr_t)ctx->args[i].ptr;
857
858 if (!kernel) {
859 if (copy_from_user(dst, (void __user *)src,
860 len)) {
861 err = -EFAULT;
862 goto bail;
863 }
864 } else {
865 memcpy(dst, src, len);
866 }
867 }
868 }
869
870 for (i = ctx->nbufs; i < ctx->nscalars; ++i) {
871 rpra[i].pv = (u64) ctx->args[i].ptr;
872 rpra[i].len = ctx->args[i].length;
873 list[i].num = ctx->args[i].length ? 1 : 0;
874 list[i].pgidx = i;
875 pages[i].addr = ctx->maps[i]->phys;
876 pages[i].size = ctx->maps[i]->size;
877 }
878
879bail:
880 if (err)
881 dev_err(dev, "Error: get invoke args failed:%d\n", err);
882
883 return err;
884}
885
886static int fastrpc_put_args(struct fastrpc_invoke_ctx *ctx,
887 u32 kernel)
888{
889 struct fastrpc_remote_arg *rpra = ctx->rpra;
890 int i, inbufs;
891
892 inbufs = REMOTE_SCALARS_INBUFS(ctx->sc);
893
894 for (i = inbufs; i < ctx->nbufs; ++i) {
895 void *src = (void *)(uintptr_t)rpra[i].pv;
896 void *dst = (void *)(uintptr_t)ctx->args[i].ptr;
897 u64 len = rpra[i].len;
898
899 if (!kernel) {
900 if (copy_to_user((void __user *)dst, src, len))
901 return -EFAULT;
902 } else {
903 memcpy(dst, src, len);
904 }
905 }
906
907 return 0;
908}
909
910static int fastrpc_invoke_send(struct fastrpc_session_ctx *sctx,
911 struct fastrpc_invoke_ctx *ctx,
912 u32 kernel, uint32_t handle)
913{
914 struct fastrpc_channel_ctx *cctx;
915 struct fastrpc_user *fl = ctx->fl;
916 struct fastrpc_msg *msg = &ctx->msg;
917 int ret;
918
919 cctx = fl->cctx;
920 msg->pid = fl->tgid;
921 msg->tid = current->pid;
922
923 if (kernel)
924 msg->pid = 0;
925
926 msg->ctx = ctx->ctxid | fl->pd;
927 msg->handle = handle;
928 msg->sc = ctx->sc;
929 msg->addr = ctx->buf ? ctx->buf->phys : 0;
930 msg->size = roundup(ctx->msg_sz, PAGE_SIZE);
931 fastrpc_context_get(ctx);
932
933 ret = rpmsg_send(cctx->rpdev->ept, (void *)msg, sizeof(*msg));
934
935 if (ret)
936 fastrpc_context_put(ctx);
937
938 return ret;
939
940}
941
942static int fastrpc_internal_invoke(struct fastrpc_user *fl, u32 kernel,
943 u32 handle, u32 sc,
944 struct fastrpc_invoke_args *args)
945{
946 struct fastrpc_invoke_ctx *ctx = NULL;
947 int err = 0;
948
949 if (!fl->sctx)
950 return -EINVAL;
951
952 if (!fl->cctx->rpdev)
953 return -EPIPE;
954
955 if (handle == FASTRPC_INIT_HANDLE && !kernel) {
956 dev_warn_ratelimited(fl->sctx->dev, "user app trying to send a kernel RPC message (%d)\n", handle);
957 return -EPERM;
958 }
959
960 ctx = fastrpc_context_alloc(fl, kernel, sc, args);
961 if (IS_ERR(ctx))
962 return PTR_ERR(ctx);
963
964 if (ctx->nscalars) {
965 err = fastrpc_get_args(kernel, ctx);
966 if (err)
967 goto bail;
968 }
969
970 /* make sure that all CPU memory writes are seen by DSP */
971 dma_wmb();
972 /* Send invoke buffer to remote dsp */
973 err = fastrpc_invoke_send(fl->sctx, ctx, kernel, handle);
974 if (err)
975 goto bail;
976
977 if (kernel) {
978 if (!wait_for_completion_timeout(&ctx->work, 10 * HZ))
979 err = -ETIMEDOUT;
980 } else {
981 err = wait_for_completion_interruptible(&ctx->work);
982 }
983
984 if (err)
985 goto bail;
986
987 /* Check the response from remote dsp */
988 err = ctx->retval;
989 if (err)
990 goto bail;
991
992 if (ctx->nscalars) {
993 /* make sure that all memory writes by DSP are seen by CPU */
994 dma_rmb();
995 /* populate all the output buffers with results */
996 err = fastrpc_put_args(ctx, kernel);
997 if (err)
998 goto bail;
999 }
1000
1001bail:
1002 if (err != -ERESTARTSYS && err != -ETIMEDOUT) {
1003 /* We are done with this compute context */
1004 spin_lock(&fl->lock);
1005 list_del(&ctx->node);
1006 spin_unlock(&fl->lock);
1007 fastrpc_context_put(ctx);
1008 }
1009 if (err)
1010 dev_dbg(fl->sctx->dev, "Error: Invoke Failed %d\n", err);
1011
1012 return err;
1013}
1014
1015static int fastrpc_init_create_process(struct fastrpc_user *fl,
1016 char __user *argp)
1017{
1018 struct fastrpc_init_create init;
1019 struct fastrpc_invoke_args *args;
1020 struct fastrpc_phy_page pages[1];
1021 struct fastrpc_map *map = NULL;
1022 struct fastrpc_buf *imem = NULL;
1023 int memlen;
1024 int err;
1025 struct {
1026 int pgid;
1027 u32 namelen;
1028 u32 filelen;
1029 u32 pageslen;
1030 u32 attrs;
1031 u32 siglen;
1032 } inbuf;
1033 u32 sc;
1034
1035 args = kcalloc(FASTRPC_CREATE_PROCESS_NARGS, sizeof(*args), GFP_KERNEL);
1036 if (!args)
1037 return -ENOMEM;
1038
1039 if (copy_from_user(&init, argp, sizeof(init))) {
1040 err = -EFAULT;
1041 goto err;
1042 }
1043
1044 if (init.filelen > INIT_FILELEN_MAX) {
1045 err = -EINVAL;
1046 goto err;
1047 }
1048
1049 inbuf.pgid = fl->tgid;
1050 inbuf.namelen = strlen(current->comm) + 1;
1051 inbuf.filelen = init.filelen;
1052 inbuf.pageslen = 1;
1053 inbuf.attrs = init.attrs;
1054 inbuf.siglen = init.siglen;
1055 fl->pd = USER_PD;
1056
1057 if (init.filelen && init.filefd) {
1058 err = fastrpc_map_create(fl, init.filefd, init.filelen, &map);
1059 if (err)
1060 goto err;
1061 }
1062
1063 memlen = ALIGN(max(INIT_FILELEN_MAX, (int)init.filelen * 4),
1064 1024 * 1024);
1065 err = fastrpc_buf_alloc(fl, fl->sctx->dev, memlen,
1066 &imem);
1067 if (err)
1068 goto err_alloc;
1069
1070 fl->init_mem = imem;
1071 args[0].ptr = (u64)(uintptr_t)&inbuf;
1072 args[0].length = sizeof(inbuf);
1073 args[0].fd = -1;
1074
1075 args[1].ptr = (u64)(uintptr_t)current->comm;
1076 args[1].length = inbuf.namelen;
1077 args[1].fd = -1;
1078
1079 args[2].ptr = (u64) init.file;
1080 args[2].length = inbuf.filelen;
1081 args[2].fd = init.filefd;
1082
1083 pages[0].addr = imem->phys;
1084 pages[0].size = imem->size;
1085
1086 args[3].ptr = (u64)(uintptr_t) pages;
1087 args[3].length = 1 * sizeof(*pages);
1088 args[3].fd = -1;
1089
1090 args[4].ptr = (u64)(uintptr_t)&inbuf.attrs;
1091 args[4].length = sizeof(inbuf.attrs);
1092 args[4].fd = -1;
1093
1094 args[5].ptr = (u64)(uintptr_t) &inbuf.siglen;
1095 args[5].length = sizeof(inbuf.siglen);
1096 args[5].fd = -1;
1097
1098 sc = FASTRPC_SCALARS(FASTRPC_RMID_INIT_CREATE, 4, 0);
1099 if (init.attrs)
1100 sc = FASTRPC_SCALARS(FASTRPC_RMID_INIT_CREATE_ATTR, 6, 0);
1101
1102 err = fastrpc_internal_invoke(fl, true, FASTRPC_INIT_HANDLE,
1103 sc, args);
1104 if (err)
1105 goto err_invoke;
1106
1107 kfree(args);
1108
1109 return 0;
1110
1111err_invoke:
1112 fl->init_mem = NULL;
1113 fastrpc_buf_free(imem);
1114err_alloc:
1115 if (map) {
1116 spin_lock(&fl->lock);
1117 list_del(&map->node);
1118 spin_unlock(&fl->lock);
1119 fastrpc_map_put(map);
1120 }
1121err:
1122 kfree(args);
1123
1124 return err;
1125}
1126
1127static struct fastrpc_session_ctx *fastrpc_session_alloc(
1128 struct fastrpc_channel_ctx *cctx)
1129{
1130 struct fastrpc_session_ctx *session = NULL;
1131 unsigned long flags;
1132 int i;
1133
1134 spin_lock_irqsave(&cctx->lock, flags);
1135 for (i = 0; i < cctx->sesscount; i++) {
1136 if (!cctx->session[i].used && cctx->session[i].valid) {
1137 cctx->session[i].used = true;
1138 session = &cctx->session[i];
1139 break;
1140 }
1141 }
1142 spin_unlock_irqrestore(&cctx->lock, flags);
1143
1144 return session;
1145}
1146
1147static void fastrpc_session_free(struct fastrpc_channel_ctx *cctx,
1148 struct fastrpc_session_ctx *session)
1149{
1150 unsigned long flags;
1151
1152 spin_lock_irqsave(&cctx->lock, flags);
1153 session->used = false;
1154 spin_unlock_irqrestore(&cctx->lock, flags);
1155}
1156
1157static int fastrpc_release_current_dsp_process(struct fastrpc_user *fl)
1158{
1159 struct fastrpc_invoke_args args[1];
1160 int tgid = 0;
1161 u32 sc;
1162
1163 tgid = fl->tgid;
1164 args[0].ptr = (u64)(uintptr_t) &tgid;
1165 args[0].length = sizeof(tgid);
1166 args[0].fd = -1;
1167 args[0].reserved = 0;
1168 sc = FASTRPC_SCALARS(FASTRPC_RMID_INIT_RELEASE, 1, 0);
1169
1170 return fastrpc_internal_invoke(fl, true, FASTRPC_INIT_HANDLE,
1171 sc, &args[0]);
1172}
1173
1174static int fastrpc_device_release(struct inode *inode, struct file *file)
1175{
1176 struct fastrpc_user *fl = (struct fastrpc_user *)file->private_data;
1177 struct fastrpc_channel_ctx *cctx = fl->cctx;
1178 struct fastrpc_invoke_ctx *ctx, *n;
1179 struct fastrpc_map *map, *m;
1180 struct fastrpc_buf *buf, *b;
1181 unsigned long flags;
1182
1183 fastrpc_release_current_dsp_process(fl);
1184
1185 spin_lock_irqsave(&cctx->lock, flags);
1186 list_del(&fl->user);
1187 spin_unlock_irqrestore(&cctx->lock, flags);
1188
1189 if (fl->init_mem)
1190 fastrpc_buf_free(fl->init_mem);
1191
1192 list_for_each_entry_safe(ctx, n, &fl->pending, node) {
1193 list_del(&ctx->node);
1194 fastrpc_context_put(ctx);
1195 }
1196
1197 list_for_each_entry_safe(map, m, &fl->maps, node) {
1198 list_del(&map->node);
1199 fastrpc_map_put(map);
1200 }
1201
1202 list_for_each_entry_safe(buf, b, &fl->mmaps, node) {
1203 list_del(&buf->node);
1204 fastrpc_buf_free(buf);
1205 }
1206
1207 fastrpc_session_free(cctx, fl->sctx);
1208 fastrpc_channel_ctx_put(cctx);
1209
1210 mutex_destroy(&fl->mutex);
1211 kfree(fl);
1212 file->private_data = NULL;
1213
1214 return 0;
1215}
1216
1217static int fastrpc_device_open(struct inode *inode, struct file *filp)
1218{
1219 struct fastrpc_channel_ctx *cctx = miscdev_to_cctx(filp->private_data);
1220 struct fastrpc_user *fl = NULL;
1221 unsigned long flags;
1222
1223 fl = kzalloc(sizeof(*fl), GFP_KERNEL);
1224 if (!fl)
1225 return -ENOMEM;
1226
1227 /* Released in fastrpc_device_release() */
1228 fastrpc_channel_ctx_get(cctx);
1229
1230 filp->private_data = fl;
1231 spin_lock_init(&fl->lock);
1232 mutex_init(&fl->mutex);
1233 INIT_LIST_HEAD(&fl->pending);
1234 INIT_LIST_HEAD(&fl->maps);
1235 INIT_LIST_HEAD(&fl->mmaps);
1236 INIT_LIST_HEAD(&fl->user);
1237 fl->tgid = current->tgid;
1238 fl->cctx = cctx;
1239
1240 fl->sctx = fastrpc_session_alloc(cctx);
1241 if (!fl->sctx) {
1242 dev_err(&cctx->rpdev->dev, "No session available\n");
1243 mutex_destroy(&fl->mutex);
1244 kfree(fl);
1245
1246 return -EBUSY;
1247 }
1248
1249 spin_lock_irqsave(&cctx->lock, flags);
1250 list_add_tail(&fl->user, &cctx->users);
1251 spin_unlock_irqrestore(&cctx->lock, flags);
1252
1253 return 0;
1254}
1255
1256static int fastrpc_dmabuf_alloc(struct fastrpc_user *fl, char __user *argp)
1257{
1258 struct fastrpc_alloc_dma_buf bp;
1259 DEFINE_DMA_BUF_EXPORT_INFO(exp_info);
1260 struct fastrpc_buf *buf = NULL;
1261 int err;
1262
1263 if (copy_from_user(&bp, argp, sizeof(bp)))
1264 return -EFAULT;
1265
1266 err = fastrpc_buf_alloc(fl, fl->sctx->dev, bp.size, &buf);
1267 if (err)
1268 return err;
1269 exp_info.ops = &fastrpc_dma_buf_ops;
1270 exp_info.size = bp.size;
1271 exp_info.flags = O_RDWR;
1272 exp_info.priv = buf;
1273 buf->dmabuf = dma_buf_export(&exp_info);
1274 if (IS_ERR(buf->dmabuf)) {
1275 err = PTR_ERR(buf->dmabuf);
1276 fastrpc_buf_free(buf);
1277 return err;
1278 }
1279
1280 bp.fd = dma_buf_fd(buf->dmabuf, O_ACCMODE);
1281 if (bp.fd < 0) {
1282 dma_buf_put(buf->dmabuf);
1283 return -EINVAL;
1284 }
1285
1286 if (copy_to_user(argp, &bp, sizeof(bp))) {
1287 dma_buf_put(buf->dmabuf);
1288 return -EFAULT;
1289 }
1290
1291 return 0;
1292}
1293
1294static int fastrpc_init_attach(struct fastrpc_user *fl, int pd)
1295{
1296 struct fastrpc_invoke_args args[1];
1297 int tgid = fl->tgid;
1298 u32 sc;
1299
1300 args[0].ptr = (u64)(uintptr_t) &tgid;
1301 args[0].length = sizeof(tgid);
1302 args[0].fd = -1;
1303 args[0].reserved = 0;
1304 sc = FASTRPC_SCALARS(FASTRPC_RMID_INIT_ATTACH, 1, 0);
1305 fl->pd = pd;
1306
1307 return fastrpc_internal_invoke(fl, true, FASTRPC_INIT_HANDLE,
1308 sc, &args[0]);
1309}
1310
1311static int fastrpc_invoke(struct fastrpc_user *fl, char __user *argp)
1312{
1313 struct fastrpc_invoke_args *args = NULL;
1314 struct fastrpc_invoke inv;
1315 u32 nscalars;
1316 int err;
1317
1318 if (copy_from_user(&inv, argp, sizeof(inv)))
1319 return -EFAULT;
1320
1321 /* nscalars is truncated here to max supported value */
1322 nscalars = REMOTE_SCALARS_LENGTH(inv.sc);
1323 if (nscalars) {
1324 args = kcalloc(nscalars, sizeof(*args), GFP_KERNEL);
1325 if (!args)
1326 return -ENOMEM;
1327
1328 if (copy_from_user(args, (void __user *)(uintptr_t)inv.args,
1329 nscalars * sizeof(*args))) {
1330 kfree(args);
1331 return -EFAULT;
1332 }
1333 }
1334
1335 err = fastrpc_internal_invoke(fl, false, inv.handle, inv.sc, args);
1336 kfree(args);
1337
1338 return err;
1339}
1340
1341static int fastrpc_req_munmap_impl(struct fastrpc_user *fl,
1342 struct fastrpc_req_munmap *req)
1343{
1344 struct fastrpc_invoke_args args[1] = { [0] = { 0 } };
1345 struct fastrpc_buf *buf, *b;
1346 struct fastrpc_munmap_req_msg req_msg;
1347 struct device *dev = fl->sctx->dev;
1348 int err;
1349 u32 sc;
1350
1351 spin_lock(&fl->lock);
1352 list_for_each_entry_safe(buf, b, &fl->mmaps, node) {
1353 if ((buf->raddr == req->vaddrout) && (buf->size == req->size))
1354 break;
1355 buf = NULL;
1356 }
1357 spin_unlock(&fl->lock);
1358
1359 if (!buf) {
1360 dev_err(dev, "mmap not in list\n");
1361 return -EINVAL;
1362 }
1363
1364 req_msg.pgid = fl->tgid;
1365 req_msg.size = buf->size;
1366 req_msg.vaddr = buf->raddr;
1367
1368 args[0].ptr = (u64) (uintptr_t) &req_msg;
1369 args[0].length = sizeof(req_msg);
1370
1371 sc = FASTRPC_SCALARS(FASTRPC_RMID_INIT_MUNMAP, 1, 0);
1372 err = fastrpc_internal_invoke(fl, true, FASTRPC_INIT_HANDLE, sc,
1373 &args[0]);
1374 if (!err) {
1375 dev_dbg(dev, "unmmap\tpt 0x%09lx OK\n", buf->raddr);
1376 spin_lock(&fl->lock);
1377 list_del(&buf->node);
1378 spin_unlock(&fl->lock);
1379 fastrpc_buf_free(buf);
1380 } else {
1381 dev_err(dev, "unmmap\tpt 0x%09lx ERROR\n", buf->raddr);
1382 }
1383
1384 return err;
1385}
1386
1387static int fastrpc_req_munmap(struct fastrpc_user *fl, char __user *argp)
1388{
1389 struct fastrpc_req_munmap req;
1390
1391 if (copy_from_user(&req, argp, sizeof(req)))
1392 return -EFAULT;
1393
1394 return fastrpc_req_munmap_impl(fl, &req);
1395}
1396
1397static int fastrpc_req_mmap(struct fastrpc_user *fl, char __user *argp)
1398{
1399 struct fastrpc_invoke_args args[3] = { [0 ... 2] = { 0 } };
1400 struct fastrpc_buf *buf = NULL;
1401 struct fastrpc_mmap_req_msg req_msg;
1402 struct fastrpc_mmap_rsp_msg rsp_msg;
1403 struct fastrpc_req_munmap req_unmap;
1404 struct fastrpc_phy_page pages;
1405 struct fastrpc_req_mmap req;
1406 struct device *dev = fl->sctx->dev;
1407 int err;
1408 u32 sc;
1409
1410 if (copy_from_user(&req, argp, sizeof(req)))
1411 return -EFAULT;
1412
1413 if (req.flags != ADSP_MMAP_ADD_PAGES) {
1414 dev_err(dev, "flag not supported 0x%x\n", req.flags);
1415 return -EINVAL;
1416 }
1417
1418 if (req.vaddrin) {
1419 dev_err(dev, "adding user allocated pages is not supported\n");
1420 return -EINVAL;
1421 }
1422
1423 err = fastrpc_buf_alloc(fl, fl->sctx->dev, req.size, &buf);
1424 if (err) {
1425 dev_err(dev, "failed to allocate buffer\n");
1426 return err;
1427 }
1428
1429 req_msg.pgid = fl->tgid;
1430 req_msg.flags = req.flags;
1431 req_msg.vaddr = req.vaddrin;
1432 req_msg.num = sizeof(pages);
1433
1434 args[0].ptr = (u64) (uintptr_t) &req_msg;
1435 args[0].length = sizeof(req_msg);
1436
1437 pages.addr = buf->phys;
1438 pages.size = buf->size;
1439
1440 args[1].ptr = (u64) (uintptr_t) &pages;
1441 args[1].length = sizeof(pages);
1442
1443 args[2].ptr = (u64) (uintptr_t) &rsp_msg;
1444 args[2].length = sizeof(rsp_msg);
1445
1446 sc = FASTRPC_SCALARS(FASTRPC_RMID_INIT_MMAP, 2, 1);
1447 err = fastrpc_internal_invoke(fl, true, FASTRPC_INIT_HANDLE, sc,
1448 &args[0]);
1449 if (err) {
1450 dev_err(dev, "mmap error (len 0x%08llx)\n", buf->size);
1451 goto err_invoke;
1452 }
1453
1454 /* update the buffer to be able to deallocate the memory on the DSP */
1455 buf->raddr = (uintptr_t) rsp_msg.vaddr;
1456
1457 /* let the client know the address to use */
1458 req.vaddrout = rsp_msg.vaddr;
1459
1460 spin_lock(&fl->lock);
1461 list_add_tail(&buf->node, &fl->mmaps);
1462 spin_unlock(&fl->lock);
1463
1464 if (copy_to_user((void __user *)argp, &req, sizeof(req))) {
1465 /* unmap the memory and release the buffer */
1466 req_unmap.vaddrout = buf->raddr;
1467 req_unmap.size = buf->size;
1468 fastrpc_req_munmap_impl(fl, &req_unmap);
1469 return -EFAULT;
1470 }
1471
1472 dev_dbg(dev, "mmap\t\tpt 0x%09lx OK [len 0x%08llx]\n",
1473 buf->raddr, buf->size);
1474
1475 return 0;
1476
1477err_invoke:
1478 fastrpc_buf_free(buf);
1479
1480 return err;
1481}
1482
1483static long fastrpc_device_ioctl(struct file *file, unsigned int cmd,
1484 unsigned long arg)
1485{
1486 struct fastrpc_user *fl = (struct fastrpc_user *)file->private_data;
1487 char __user *argp = (char __user *)arg;
1488 int err;
1489
1490 switch (cmd) {
1491 case FASTRPC_IOCTL_INVOKE:
1492 err = fastrpc_invoke(fl, argp);
1493 break;
1494 case FASTRPC_IOCTL_INIT_ATTACH:
1495 err = fastrpc_init_attach(fl, AUDIO_PD);
1496 break;
1497 case FASTRPC_IOCTL_INIT_ATTACH_SNS:
1498 err = fastrpc_init_attach(fl, SENSORS_PD);
1499 break;
1500 case FASTRPC_IOCTL_INIT_CREATE:
1501 err = fastrpc_init_create_process(fl, argp);
1502 break;
1503 case FASTRPC_IOCTL_ALLOC_DMA_BUFF:
1504 err = fastrpc_dmabuf_alloc(fl, argp);
1505 break;
1506 case FASTRPC_IOCTL_MMAP:
1507 err = fastrpc_req_mmap(fl, argp);
1508 break;
1509 case FASTRPC_IOCTL_MUNMAP:
1510 err = fastrpc_req_munmap(fl, argp);
1511 break;
1512 default:
1513 err = -ENOTTY;
1514 break;
1515 }
1516
1517 return err;
1518}
1519
1520static const struct file_operations fastrpc_fops = {
1521 .open = fastrpc_device_open,
1522 .release = fastrpc_device_release,
1523 .unlocked_ioctl = fastrpc_device_ioctl,
1524 .compat_ioctl = fastrpc_device_ioctl,
1525};
1526
1527static int fastrpc_cb_probe(struct platform_device *pdev)
1528{
1529 struct fastrpc_channel_ctx *cctx;
1530 struct fastrpc_session_ctx *sess;
1531 struct device *dev = &pdev->dev;
1532 int i, sessions = 0;
1533 unsigned long flags;
1534 int rc;
1535
1536 cctx = dev_get_drvdata(dev->parent);
1537 if (!cctx)
1538 return -EINVAL;
1539
1540 of_property_read_u32(dev->of_node, "qcom,nsessions", &sessions);
1541
1542 spin_lock_irqsave(&cctx->lock, flags);
1543 sess = &cctx->session[cctx->sesscount];
1544 sess->used = false;
1545 sess->valid = true;
1546 sess->dev = dev;
1547 dev_set_drvdata(dev, sess);
1548
1549 if (of_property_read_u32(dev->of_node, "reg", &sess->sid))
1550 dev_info(dev, "FastRPC Session ID not specified in DT\n");
1551
1552 if (sessions > 0) {
1553 struct fastrpc_session_ctx *dup_sess;
1554
1555 for (i = 1; i < sessions; i++) {
1556 if (cctx->sesscount++ >= FASTRPC_MAX_SESSIONS)
1557 break;
1558 dup_sess = &cctx->session[cctx->sesscount];
1559 memcpy(dup_sess, sess, sizeof(*dup_sess));
1560 }
1561 }
1562 cctx->sesscount++;
1563 spin_unlock_irqrestore(&cctx->lock, flags);
1564 rc = dma_set_mask(dev, DMA_BIT_MASK(32));
1565 if (rc) {
1566 dev_err(dev, "32-bit DMA enable failed\n");
1567 return rc;
1568 }
1569
1570 return 0;
1571}
1572
1573static int fastrpc_cb_remove(struct platform_device *pdev)
1574{
1575 struct fastrpc_channel_ctx *cctx = dev_get_drvdata(pdev->dev.parent);
1576 struct fastrpc_session_ctx *sess = dev_get_drvdata(&pdev->dev);
1577 unsigned long flags;
1578 int i;
1579
1580 spin_lock_irqsave(&cctx->lock, flags);
1581 for (i = 1; i < FASTRPC_MAX_SESSIONS; i++) {
1582 if (cctx->session[i].sid == sess->sid) {
1583 cctx->session[i].valid = false;
1584 cctx->sesscount--;
1585 }
1586 }
1587 spin_unlock_irqrestore(&cctx->lock, flags);
1588
1589 return 0;
1590}
1591
1592static const struct of_device_id fastrpc_match_table[] = {
1593 { .compatible = "qcom,fastrpc-compute-cb", },
1594 {}
1595};
1596
1597static struct platform_driver fastrpc_cb_driver = {
1598 .probe = fastrpc_cb_probe,
1599 .remove = fastrpc_cb_remove,
1600 .driver = {
1601 .name = "qcom,fastrpc-cb",
1602 .of_match_table = fastrpc_match_table,
1603 .suppress_bind_attrs = true,
1604 },
1605};
1606
1607static int fastrpc_rpmsg_probe(struct rpmsg_device *rpdev)
1608{
1609 struct device *rdev = &rpdev->dev;
1610 struct fastrpc_channel_ctx *data;
1611 int i, err, domain_id = -1;
1612 const char *domain;
1613
1614 err = of_property_read_string(rdev->of_node, "label", &domain);
1615 if (err) {
1616 dev_info(rdev, "FastRPC Domain not specified in DT\n");
1617 return err;
1618 }
1619
1620 for (i = 0; i <= CDSP_DOMAIN_ID; i++) {
1621 if (!strcmp(domains[i], domain)) {
1622 domain_id = i;
1623 break;
1624 }
1625 }
1626
1627 if (domain_id < 0) {
1628 dev_info(rdev, "FastRPC Invalid Domain ID %d\n", domain_id);
1629 return -EINVAL;
1630 }
1631
1632 data = kzalloc(sizeof(*data), GFP_KERNEL);
1633 if (!data)
1634 return -ENOMEM;
1635
1636 data->miscdev.minor = MISC_DYNAMIC_MINOR;
1637 data->miscdev.name = devm_kasprintf(rdev, GFP_KERNEL, "fastrpc-%s",
1638 domains[domain_id]);
1639 data->miscdev.fops = &fastrpc_fops;
1640 err = misc_register(&data->miscdev);
1641 if (err) {
1642 kfree(data);
1643 return err;
1644 }
1645
1646 kref_init(&data->refcount);
1647
1648 dev_set_drvdata(&rpdev->dev, data);
1649 dma_set_mask_and_coherent(rdev, DMA_BIT_MASK(32));
1650 INIT_LIST_HEAD(&data->users);
1651 spin_lock_init(&data->lock);
1652 idr_init(&data->ctx_idr);
1653 data->domain_id = domain_id;
1654 data->rpdev = rpdev;
1655
1656 return of_platform_populate(rdev->of_node, NULL, NULL, rdev);
1657}
1658
1659static void fastrpc_notify_users(struct fastrpc_user *user)
1660{
1661 struct fastrpc_invoke_ctx *ctx;
1662
1663 spin_lock(&user->lock);
1664 list_for_each_entry(ctx, &user->pending, node)
1665 complete(&ctx->work);
1666 spin_unlock(&user->lock);
1667}
1668
1669static void fastrpc_rpmsg_remove(struct rpmsg_device *rpdev)
1670{
1671 struct fastrpc_channel_ctx *cctx = dev_get_drvdata(&rpdev->dev);
1672 struct fastrpc_user *user;
1673 unsigned long flags;
1674
1675 spin_lock_irqsave(&cctx->lock, flags);
1676 list_for_each_entry(user, &cctx->users, user)
1677 fastrpc_notify_users(user);
1678 spin_unlock_irqrestore(&cctx->lock, flags);
1679
1680 misc_deregister(&cctx->miscdev);
1681 of_platform_depopulate(&rpdev->dev);
1682
1683 cctx->rpdev = NULL;
1684 fastrpc_channel_ctx_put(cctx);
1685}
1686
1687static int fastrpc_rpmsg_callback(struct rpmsg_device *rpdev, void *data,
1688 int len, void *priv, u32 addr)
1689{
1690 struct fastrpc_channel_ctx *cctx = dev_get_drvdata(&rpdev->dev);
1691 struct fastrpc_invoke_rsp *rsp = data;
1692 struct fastrpc_invoke_ctx *ctx;
1693 unsigned long flags;
1694 unsigned long ctxid;
1695
1696 if (len < sizeof(*rsp))
1697 return -EINVAL;
1698
1699 ctxid = ((rsp->ctx & FASTRPC_CTXID_MASK) >> 4);
1700
1701 spin_lock_irqsave(&cctx->lock, flags);
1702 ctx = idr_find(&cctx->ctx_idr, ctxid);
1703 spin_unlock_irqrestore(&cctx->lock, flags);
1704
1705 if (!ctx) {
1706 dev_err(&rpdev->dev, "No context ID matches response\n");
1707 return -ENOENT;
1708 }
1709
1710 ctx->retval = rsp->retval;
1711 complete(&ctx->work);
1712
1713 /*
1714 * The DMA buffer associated with the context cannot be freed in
1715 * interrupt context so schedule it through a worker thread to
1716 * avoid a kernel BUG.
1717 */
1718 schedule_work(&ctx->put_work);
1719
1720 return 0;
1721}
1722
1723static const struct of_device_id fastrpc_rpmsg_of_match[] = {
1724 { .compatible = "qcom,fastrpc" },
1725 { },
1726};
1727MODULE_DEVICE_TABLE(of, fastrpc_rpmsg_of_match);
1728
1729static struct rpmsg_driver fastrpc_driver = {
1730 .probe = fastrpc_rpmsg_probe,
1731 .remove = fastrpc_rpmsg_remove,
1732 .callback = fastrpc_rpmsg_callback,
1733 .drv = {
1734 .name = "qcom,fastrpc",
1735 .of_match_table = fastrpc_rpmsg_of_match,
1736 },
1737};
1738
1739static int fastrpc_init(void)
1740{
1741 int ret;
1742
1743 ret = platform_driver_register(&fastrpc_cb_driver);
1744 if (ret < 0) {
1745 pr_err("fastrpc: failed to register cb driver\n");
1746 return ret;
1747 }
1748
1749 ret = register_rpmsg_driver(&fastrpc_driver);
1750 if (ret < 0) {
1751 pr_err("fastrpc: failed to register rpmsg driver\n");
1752 platform_driver_unregister(&fastrpc_cb_driver);
1753 return ret;
1754 }
1755
1756 return 0;
1757}
1758module_init(fastrpc_init);
1759
1760static void fastrpc_exit(void)
1761{
1762 platform_driver_unregister(&fastrpc_cb_driver);
1763 unregister_rpmsg_driver(&fastrpc_driver);
1764}
1765module_exit(fastrpc_exit);
1766
1767MODULE_LICENSE("GPL v2");