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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#define miscdev_to_cctx(d) container_of(d, struct fastrpc_channel_ctx, miscdev)
77
78static const char *domains[FASTRPC_DEV_MAX] = { "adsp", "mdsp",
79 "sdsp", "cdsp"};
80struct fastrpc_phy_page {
81 u64 addr; /* physical address */
82 u64 size; /* size of contiguous region */
83};
84
85struct fastrpc_invoke_buf {
86 u32 num; /* number of contiguous regions */
87 u32 pgidx; /* index to start of contiguous region */
88};
89
90struct fastrpc_remote_arg {
91 u64 pv;
92 u64 len;
93};
94
95struct fastrpc_mmap_rsp_msg {
96 u64 vaddr;
97};
98
99struct fastrpc_mmap_req_msg {
100 s32 pgid;
101 u32 flags;
102 u64 vaddr;
103 s32 num;
104};
105
106struct fastrpc_munmap_req_msg {
107 s32 pgid;
108 u64 vaddr;
109 u64 size;
110};
111
112struct fastrpc_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 */
120};
121
122struct fastrpc_invoke_rsp {
123 u64 ctx; /* invoke caller context */
124 int retval; /* invoke return value */
125};
126
127struct fastrpc_buf_overlap {
128 u64 start;
129 u64 end;
130 int raix;
131 u64 mstart;
132 u64 mend;
133 u64 offset;
134};
135
136struct fastrpc_buf {
137 struct fastrpc_user *fl;
138 struct dma_buf *dmabuf;
139 struct device *dev;
140 void *virt;
141 u64 phys;
142 u64 size;
143 /* Lock for dma buf attachments */
144 struct mutex lock;
145 struct list_head attachments;
146 /* mmap support */
147 struct list_head node; /* list of user requested mmaps */
148 uintptr_t raddr;
149};
150
151struct fastrpc_dma_buf_attachment {
152 struct device *dev;
153 struct sg_table sgt;
154 struct list_head node;
155};
156
157struct fastrpc_map {
158 struct list_head node;
159 struct fastrpc_user *fl;
160 int fd;
161 struct dma_buf *buf;
162 struct sg_table *table;
163 struct dma_buf_attachment *attach;
164 u64 phys;
165 u64 size;
166 void *va;
167 u64 len;
168 struct kref refcount;
169};
170
171struct fastrpc_invoke_ctx {
172 int nscalars;
173 int nbufs;
174 int retval;
175 int pid;
176 int tgid;
177 u32 sc;
178 u32 *crc;
179 u64 ctxid;
180 u64 msg_sz;
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;
193};
194
195struct fastrpc_session_ctx {
196 struct device *dev;
197 int sid;
198 bool used;
199 bool valid;
200};
201
202struct fastrpc_channel_ctx {
203 int domain_id;
204 int sesscount;
205 struct rpmsg_device *rpdev;
206 struct fastrpc_session_ctx session[FASTRPC_MAX_SESSIONS];
207 spinlock_t lock;
208 struct idr ctx_idr;
209 struct list_head users;
210 struct miscdevice miscdev;
211 struct kref refcount;
212};
213
214struct fastrpc_user {
215 struct list_head user;
216 struct list_head maps;
217 struct list_head pending;
218 struct list_head mmaps;
219
220 struct fastrpc_channel_ctx *cctx;
221 struct fastrpc_session_ctx *sctx;
222 struct fastrpc_buf *init_mem;
223
224 int tgid;
225 int pd;
226 /* Lock for lists */
227 spinlock_t lock;
228 /* lock for allocations */
229 struct mutex mutex;
230};
231
232static void fastrpc_free_map(struct kref *ref)
233{
234 struct fastrpc_map *map;
235
236 map = container_of(ref, struct fastrpc_map, refcount);
237
238 if (map->table) {
239 dma_buf_unmap_attachment(map->attach, map->table,
240 DMA_BIDIRECTIONAL);
241 dma_buf_detach(map->buf, map->attach);
242 dma_buf_put(map->buf);
243 }
244
245 kfree(map);
246}
247
248static void fastrpc_map_put(struct fastrpc_map *map)
249{
250 if (map)
251 kref_put(&map->refcount, fastrpc_free_map);
252}
253
254static void fastrpc_map_get(struct fastrpc_map *map)
255{
256 if (map)
257 kref_get(&map->refcount);
258}
259
260static int fastrpc_map_find(struct fastrpc_user *fl, int fd,
261 struct fastrpc_map **ppmap)
262{
263 struct fastrpc_map *map = NULL;
264
265 mutex_lock(&fl->mutex);
266 list_for_each_entry(map, &fl->maps, node) {
267 if (map->fd == fd) {
268 fastrpc_map_get(map);
269 *ppmap = map;
270 mutex_unlock(&fl->mutex);
271 return 0;
272 }
273 }
274 mutex_unlock(&fl->mutex);
275
276 return -ENOENT;
277}
278
279static void fastrpc_buf_free(struct fastrpc_buf *buf)
280{
281 dma_free_coherent(buf->dev, buf->size, buf->virt,
282 FASTRPC_PHYS(buf->phys));
283 kfree(buf);
284}
285
286static int fastrpc_buf_alloc(struct fastrpc_user *fl, struct device *dev,
287 u64 size, struct fastrpc_buf **obuf)
288{
289 struct fastrpc_buf *buf;
290
291 buf = kzalloc(sizeof(*buf), GFP_KERNEL);
292 if (!buf)
293 return -ENOMEM;
294
295 INIT_LIST_HEAD(&buf->attachments);
296 INIT_LIST_HEAD(&buf->node);
297 mutex_init(&buf->lock);
298
299 buf->fl = fl;
300 buf->virt = NULL;
301 buf->phys = 0;
302 buf->size = size;
303 buf->dev = dev;
304 buf->raddr = 0;
305
306 buf->virt = dma_alloc_coherent(dev, buf->size, (dma_addr_t *)&buf->phys,
307 GFP_KERNEL);
308 if (!buf->virt) {
309 mutex_destroy(&buf->lock);
310 kfree(buf);
311 return -ENOMEM;
312 }
313
314 if (fl->sctx && fl->sctx->sid)
315 buf->phys += ((u64)fl->sctx->sid << 32);
316
317 *obuf = buf;
318
319 return 0;
320}
321
322static void fastrpc_channel_ctx_free(struct kref *ref)
323{
324 struct fastrpc_channel_ctx *cctx;
325
326 cctx = container_of(ref, struct fastrpc_channel_ctx, refcount);
327
328 kfree(cctx);
329}
330
331static void fastrpc_channel_ctx_get(struct fastrpc_channel_ctx *cctx)
332{
333 kref_get(&cctx->refcount);
334}
335
336static void fastrpc_channel_ctx_put(struct fastrpc_channel_ctx *cctx)
337{
338 kref_put(&cctx->refcount, fastrpc_channel_ctx_free);
339}
340
341static void fastrpc_context_free(struct kref *ref)
342{
343 struct fastrpc_invoke_ctx *ctx;
344 struct fastrpc_channel_ctx *cctx;
345 unsigned long flags;
346 int i;
347
348 ctx = container_of(ref, struct fastrpc_invoke_ctx, refcount);
349 cctx = ctx->cctx;
350
351 for (i = 0; i < ctx->nscalars; i++)
352 fastrpc_map_put(ctx->maps[i]);
353
354 if (ctx->buf)
355 fastrpc_buf_free(ctx->buf);
356
357 spin_lock_irqsave(&cctx->lock, flags);
358 idr_remove(&cctx->ctx_idr, ctx->ctxid >> 4);
359 spin_unlock_irqrestore(&cctx->lock, flags);
360
361 kfree(ctx->maps);
362 kfree(ctx->olaps);
363 kfree(ctx);
364
365 fastrpc_channel_ctx_put(cctx);
366}
367
368static void fastrpc_context_get(struct fastrpc_invoke_ctx *ctx)
369{
370 kref_get(&ctx->refcount);
371}
372
373static void fastrpc_context_put(struct fastrpc_invoke_ctx *ctx)
374{
375 kref_put(&ctx->refcount, fastrpc_context_free);
376}
377
378static void fastrpc_context_put_wq(struct work_struct *work)
379{
380 struct fastrpc_invoke_ctx *ctx =
381 container_of(work, struct fastrpc_invoke_ctx, put_work);
382
383 fastrpc_context_put(ctx);
384}
385
386#define CMP(aa, bb) ((aa) == (bb) ? 0 : (aa) < (bb) ? -1 : 1)
387static int olaps_cmp(const void *a, const void *b)
388{
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);
395
396 return st == 0 ? ed : st;
397}
398
399static void fastrpc_get_buff_overlaps(struct fastrpc_invoke_ctx *ctx)
400{
401 u64 max_end = 0;
402 int i;
403
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;
408 }
409
410 sort(ctx->olaps, ctx->nbufs, sizeof(*ctx->olaps), olaps_cmp, NULL);
411
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;
418
419 if (ctx->olaps[i].end > max_end) {
420 max_end = ctx->olaps[i].end;
421 } else {
422 ctx->olaps[i].mend = 0;
423 ctx->olaps[i].mstart = 0;
424 }
425
426 } else {
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;
431 }
432 }
433}
434
435static struct fastrpc_invoke_ctx *fastrpc_context_alloc(
436 struct fastrpc_user *user, u32 kernel, u32 sc,
437 struct fastrpc_invoke_args *args)
438{
439 struct fastrpc_channel_ctx *cctx = user->cctx;
440 struct fastrpc_invoke_ctx *ctx = NULL;
441 unsigned long flags;
442 int ret;
443
444 ctx = kzalloc(sizeof(*ctx), GFP_KERNEL);
445 if (!ctx)
446 return ERR_PTR(-ENOMEM);
447
448 INIT_LIST_HEAD(&ctx->node);
449 ctx->fl = user;
450 ctx->nscalars = REMOTE_SCALARS_LENGTH(sc);
451 ctx->nbufs = REMOTE_SCALARS_INBUFS(sc) +
452 REMOTE_SCALARS_OUTBUFS(sc);
453
454 if (ctx->nscalars) {
455 ctx->maps = kcalloc(ctx->nscalars,
456 sizeof(*ctx->maps), GFP_KERNEL);
457 if (!ctx->maps) {
458 kfree(ctx);
459 return ERR_PTR(-ENOMEM);
460 }
461 ctx->olaps = kcalloc(ctx->nscalars,
462 sizeof(*ctx->olaps), GFP_KERNEL);
463 if (!ctx->olaps) {
464 kfree(ctx->maps);
465 kfree(ctx);
466 return ERR_PTR(-ENOMEM);
467 }
468 ctx->args = args;
469 fastrpc_get_buff_overlaps(ctx);
470 }
471
472 /* Released in fastrpc_context_put() */
473 fastrpc_channel_ctx_get(cctx);
474
475 ctx->sc = sc;
476 ctx->retval = -1;
477 ctx->pid = current->pid;
478 ctx->tgid = user->tgid;
479 ctx->cctx = cctx;
480 init_completion(&ctx->work);
481 INIT_WORK(&ctx->put_work, fastrpc_context_put_wq);
482
483 spin_lock(&user->lock);
484 list_add_tail(&ctx->node, &user->pending);
485 spin_unlock(&user->lock);
486
487 spin_lock_irqsave(&cctx->lock, flags);
488 ret = idr_alloc_cyclic(&cctx->ctx_idr, ctx, 1,
489 FASTRPC_CTX_MAX, GFP_ATOMIC);
490 if (ret < 0) {
491 spin_unlock_irqrestore(&cctx->lock, flags);
492 goto err_idr;
493 }
494 ctx->ctxid = ret << 4;
495 spin_unlock_irqrestore(&cctx->lock, flags);
496
497 kref_init(&ctx->refcount);
498
499 return ctx;
500err_idr:
501 spin_lock(&user->lock);
502 list_del(&ctx->node);
503 spin_unlock(&user->lock);
504 fastrpc_channel_ctx_put(cctx);
505 kfree(ctx->maps);
506 kfree(ctx->olaps);
507 kfree(ctx);
508
509 return ERR_PTR(ret);
510}
511
512static struct sg_table *
513fastrpc_map_dma_buf(struct dma_buf_attachment *attachment,
514 enum dma_data_direction dir)
515{
516 struct fastrpc_dma_buf_attachment *a = attachment->priv;
517 struct sg_table *table;
518
519 table = &a->sgt;
520
521 if (!dma_map_sg(attachment->dev, table->sgl, table->nents, dir))
522 return ERR_PTR(-ENOMEM);
523
524 return table;
525}
526
527static void fastrpc_unmap_dma_buf(struct dma_buf_attachment *attach,
528 struct sg_table *table,
529 enum dma_data_direction dir)
530{
531 dma_unmap_sg(attach->dev, table->sgl, table->nents, dir);
532}
533
534static void fastrpc_release(struct dma_buf *dmabuf)
535{
536 struct fastrpc_buf *buffer = dmabuf->priv;
537
538 fastrpc_buf_free(buffer);
539}
540
541static int fastrpc_dma_buf_attach(struct dma_buf *dmabuf,
542 struct dma_buf_attachment *attachment)
543{
544 struct fastrpc_dma_buf_attachment *a;
545 struct fastrpc_buf *buffer = dmabuf->priv;
546 int ret;
547
548 a = kzalloc(sizeof(*a), GFP_KERNEL);
549 if (!a)
550 return -ENOMEM;
551
552 ret = dma_get_sgtable(buffer->dev, &a->sgt, buffer->virt,
553 FASTRPC_PHYS(buffer->phys), buffer->size);
554 if (ret < 0) {
555 dev_err(buffer->dev, "failed to get scatterlist from DMA API\n");
556 kfree(a);
557 return -EINVAL;
558 }
559
560 a->dev = attachment->dev;
561 INIT_LIST_HEAD(&a->node);
562 attachment->priv = a;
563
564 mutex_lock(&buffer->lock);
565 list_add(&a->node, &buffer->attachments);
566 mutex_unlock(&buffer->lock);
567
568 return 0;
569}
570
571static void fastrpc_dma_buf_detatch(struct dma_buf *dmabuf,
572 struct dma_buf_attachment *attachment)
573{
574 struct fastrpc_dma_buf_attachment *a = attachment->priv;
575 struct fastrpc_buf *buffer = dmabuf->priv;
576
577 mutex_lock(&buffer->lock);
578 list_del(&a->node);
579 mutex_unlock(&buffer->lock);
580 sg_free_table(&a->sgt);
581 kfree(a);
582}
583
584static void *fastrpc_vmap(struct dma_buf *dmabuf)
585{
586 struct fastrpc_buf *buf = dmabuf->priv;
587
588 return buf->virt;
589}
590
591static int fastrpc_mmap(struct dma_buf *dmabuf,
592 struct vm_area_struct *vma)
593{
594 struct fastrpc_buf *buf = dmabuf->priv;
595 size_t size = vma->vm_end - vma->vm_start;
596
597 return dma_mmap_coherent(buf->dev, vma, buf->virt,
598 FASTRPC_PHYS(buf->phys), size);
599}
600
601static const struct dma_buf_ops fastrpc_dma_buf_ops = {
602 .attach = fastrpc_dma_buf_attach,
603 .detach = fastrpc_dma_buf_detatch,
604 .map_dma_buf = fastrpc_map_dma_buf,
605 .unmap_dma_buf = fastrpc_unmap_dma_buf,
606 .mmap = fastrpc_mmap,
607 .vmap = fastrpc_vmap,
608 .release = fastrpc_release,
609};
610
611static int fastrpc_map_create(struct fastrpc_user *fl, int fd,
612 u64 len, struct fastrpc_map **ppmap)
613{
614 struct fastrpc_session_ctx *sess = fl->sctx;
615 struct fastrpc_map *map = NULL;
616 int err = 0;
617
618 if (!fastrpc_map_find(fl, fd, ppmap))
619 return 0;
620
621 map = kzalloc(sizeof(*map), GFP_KERNEL);
622 if (!map)
623 return -ENOMEM;
624
625 INIT_LIST_HEAD(&map->node);
626 map->fl = fl;
627 map->fd = fd;
628 map->buf = dma_buf_get(fd);
629 if (IS_ERR(map->buf)) {
630 err = PTR_ERR(map->buf);
631 goto get_err;
632 }
633
634 map->attach = dma_buf_attach(map->buf, sess->dev);
635 if (IS_ERR(map->attach)) {
636 dev_err(sess->dev, "Failed to attach dmabuf\n");
637 err = PTR_ERR(map->attach);
638 goto attach_err;
639 }
640
641 map->table = dma_buf_map_attachment(map->attach, DMA_BIDIRECTIONAL);
642 if (IS_ERR(map->table)) {
643 err = PTR_ERR(map->table);
644 goto map_err;
645 }
646
647 map->phys = sg_dma_address(map->table->sgl);
648 map->phys += ((u64)fl->sctx->sid << 32);
649 map->size = len;
650 map->va = sg_virt(map->table->sgl);
651 map->len = len;
652 kref_init(&map->refcount);
653
654 spin_lock(&fl->lock);
655 list_add_tail(&map->node, &fl->maps);
656 spin_unlock(&fl->lock);
657 *ppmap = map;
658
659 return 0;
660
661map_err:
662 dma_buf_detach(map->buf, map->attach);
663attach_err:
664 dma_buf_put(map->buf);
665get_err:
666 kfree(map);
667
668 return err;
669}
670
671/*
672 * Fastrpc payload buffer with metadata looks like:
673 *
674 * >>>>>> START of METADATA <<<<<<<<<
675 * +---------------------------------+
676 * | Arguments |
677 * | type:(struct fastrpc_remote_arg)|
678 * | (0 - N) |
679 * +---------------------------------+
680 * | Invoke Buffer list |
681 * | type:(struct fastrpc_invoke_buf)|
682 * | (0 - N) |
683 * +---------------------------------+
684 * | Page info list |
685 * | type:(struct fastrpc_phy_page) |
686 * | (0 - N) |
687 * +---------------------------------+
688 * | Optional info |
689 * |(can be specific to SoC/Firmware)|
690 * +---------------------------------+
691 * >>>>>>>> END of METADATA <<<<<<<<<
692 * +---------------------------------+
693 * | Inline ARGS |
694 * | (0-N) |
695 * +---------------------------------+
696 */
697
698static int fastrpc_get_meta_size(struct fastrpc_invoke_ctx *ctx)
699{
700 int size = 0;
701
702 size = (sizeof(struct fastrpc_remote_arg) +
703 sizeof(struct fastrpc_invoke_buf) +
704 sizeof(struct fastrpc_phy_page)) * ctx->nscalars +
705 sizeof(u64) * FASTRPC_MAX_FDLIST +
706 sizeof(u32) * FASTRPC_MAX_CRCLIST;
707
708 return size;
709}
710
711static u64 fastrpc_get_payload_size(struct fastrpc_invoke_ctx *ctx, int metalen)
712{
713 u64 size = 0;
714 int i;
715
716 size = ALIGN(metalen, FASTRPC_ALIGN);
717 for (i = 0; i < ctx->nscalars; i++) {
718 if (ctx->args[i].fd == 0 || ctx->args[i].fd == -1) {
719
720 if (ctx->olaps[i].offset == 0)
721 size = ALIGN(size, FASTRPC_ALIGN);
722
723 size += (ctx->olaps[i].mend - ctx->olaps[i].mstart);
724 }
725 }
726
727 return size;
728}
729
730static int fastrpc_create_maps(struct fastrpc_invoke_ctx *ctx)
731{
732 struct device *dev = ctx->fl->sctx->dev;
733 int i, err;
734
735 for (i = 0; i < ctx->nscalars; ++i) {
736 /* Make sure reserved field is set to 0 */
737 if (ctx->args[i].reserved)
738 return -EINVAL;
739
740 if (ctx->args[i].fd == 0 || ctx->args[i].fd == -1 ||
741 ctx->args[i].length == 0)
742 continue;
743
744 err = fastrpc_map_create(ctx->fl, ctx->args[i].fd,
745 ctx->args[i].length, &ctx->maps[i]);
746 if (err) {
747 dev_err(dev, "Error Creating map %d\n", err);
748 return -EINVAL;
749 }
750
751 }
752 return 0;
753}
754
755static int fastrpc_get_args(u32 kernel, struct fastrpc_invoke_ctx *ctx)
756{
757 struct device *dev = ctx->fl->sctx->dev;
758 struct fastrpc_remote_arg *rpra;
759 struct fastrpc_invoke_buf *list;
760 struct fastrpc_phy_page *pages;
761 int inbufs, i, oix, err = 0;
762 u64 len, rlen, pkt_size;
763 u64 pg_start, pg_end;
764 uintptr_t args;
765 int metalen;
766
767 inbufs = REMOTE_SCALARS_INBUFS(ctx->sc);
768 metalen = fastrpc_get_meta_size(ctx);
769 pkt_size = fastrpc_get_payload_size(ctx, metalen);
770
771 err = fastrpc_create_maps(ctx);
772 if (err)
773 return err;
774
775 ctx->msg_sz = pkt_size;
776
777 err = fastrpc_buf_alloc(ctx->fl, dev, pkt_size, &ctx->buf);
778 if (err)
779 return err;
780
781 rpra = ctx->buf->virt;
782 list = ctx->buf->virt + ctx->nscalars * sizeof(*rpra);
783 pages = ctx->buf->virt + ctx->nscalars * (sizeof(*list) +
784 sizeof(*rpra));
785 args = (uintptr_t)ctx->buf->virt + metalen;
786 rlen = pkt_size - metalen;
787 ctx->rpra = rpra;
788
789 for (oix = 0; oix < ctx->nbufs; ++oix) {
790 int mlen;
791
792 i = ctx->olaps[oix].raix;
793 len = ctx->args[i].length;
794
795 rpra[i].pv = 0;
796 rpra[i].len = len;
797 list[i].num = len ? 1 : 0;
798 list[i].pgidx = i;
799
800 if (!len)
801 continue;
802
803 if (ctx->maps[i]) {
804 struct vm_area_struct *vma = NULL;
805
806 rpra[i].pv = (u64) ctx->args[i].ptr;
807 pages[i].addr = ctx->maps[i]->phys;
808
809 vma = find_vma(current->mm, ctx->args[i].ptr);
810 if (vma)
811 pages[i].addr += ctx->args[i].ptr -
812 vma->vm_start;
813
814 pg_start = (ctx->args[i].ptr & PAGE_MASK) >> PAGE_SHIFT;
815 pg_end = ((ctx->args[i].ptr + len - 1) & PAGE_MASK) >>
816 PAGE_SHIFT;
817 pages[i].size = (pg_end - pg_start + 1) * PAGE_SIZE;
818
819 } else {
820
821 if (ctx->olaps[oix].offset == 0) {
822 rlen -= ALIGN(args, FASTRPC_ALIGN) - args;
823 args = ALIGN(args, FASTRPC_ALIGN);
824 }
825
826 mlen = ctx->olaps[oix].mend - ctx->olaps[oix].mstart;
827
828 if (rlen < mlen)
829 goto bail;
830
831 rpra[i].pv = args - ctx->olaps[oix].offset;
832 pages[i].addr = ctx->buf->phys -
833 ctx->olaps[oix].offset +
834 (pkt_size - rlen);
835 pages[i].addr = pages[i].addr & PAGE_MASK;
836
837 pg_start = (args & PAGE_MASK) >> PAGE_SHIFT;
838 pg_end = ((args + len - 1) & PAGE_MASK) >> PAGE_SHIFT;
839 pages[i].size = (pg_end - pg_start + 1) * PAGE_SIZE;
840 args = args + mlen;
841 rlen -= mlen;
842 }
843
844 if (i < inbufs && !ctx->maps[i]) {
845 void *dst = (void *)(uintptr_t)rpra[i].pv;
846 void *src = (void *)(uintptr_t)ctx->args[i].ptr;
847
848 if (!kernel) {
849 if (copy_from_user(dst, (void __user *)src,
850 len)) {
851 err = -EFAULT;
852 goto bail;
853 }
854 } else {
855 memcpy(dst, src, len);
856 }
857 }
858 }
859
860 for (i = ctx->nbufs; i < ctx->nscalars; ++i) {
861 rpra[i].pv = (u64) ctx->args[i].ptr;
862 rpra[i].len = ctx->args[i].length;
863 list[i].num = ctx->args[i].length ? 1 : 0;
864 list[i].pgidx = i;
865 pages[i].addr = ctx->maps[i]->phys;
866 pages[i].size = ctx->maps[i]->size;
867 }
868
869bail:
870 if (err)
871 dev_err(dev, "Error: get invoke args failed:%d\n", err);
872
873 return err;
874}
875
876static int fastrpc_put_args(struct fastrpc_invoke_ctx *ctx,
877 u32 kernel)
878{
879 struct fastrpc_remote_arg *rpra = ctx->rpra;
880 int i, inbufs;
881
882 inbufs = REMOTE_SCALARS_INBUFS(ctx->sc);
883
884 for (i = inbufs; i < ctx->nbufs; ++i) {
885 void *src = (void *)(uintptr_t)rpra[i].pv;
886 void *dst = (void *)(uintptr_t)ctx->args[i].ptr;
887 u64 len = rpra[i].len;
888
889 if (!kernel) {
890 if (copy_to_user((void __user *)dst, src, len))
891 return -EFAULT;
892 } else {
893 memcpy(dst, src, len);
894 }
895 }
896
897 return 0;
898}
899
900static int fastrpc_invoke_send(struct fastrpc_session_ctx *sctx,
901 struct fastrpc_invoke_ctx *ctx,
902 u32 kernel, uint32_t handle)
903{
904 struct fastrpc_channel_ctx *cctx;
905 struct fastrpc_user *fl = ctx->fl;
906 struct fastrpc_msg *msg = &ctx->msg;
907 int ret;
908
909 cctx = fl->cctx;
910 msg->pid = fl->tgid;
911 msg->tid = current->pid;
912
913 if (kernel)
914 msg->pid = 0;
915
916 msg->ctx = ctx->ctxid | fl->pd;
917 msg->handle = handle;
918 msg->sc = ctx->sc;
919 msg->addr = ctx->buf ? ctx->buf->phys : 0;
920 msg->size = roundup(ctx->msg_sz, PAGE_SIZE);
921 fastrpc_context_get(ctx);
922
923 ret = rpmsg_send(cctx->rpdev->ept, (void *)msg, sizeof(*msg));
924
925 if (ret)
926 fastrpc_context_put(ctx);
927
928 return ret;
929
930}
931
932static int fastrpc_internal_invoke(struct fastrpc_user *fl, u32 kernel,
933 u32 handle, u32 sc,
934 struct fastrpc_invoke_args *args)
935{
936 struct fastrpc_invoke_ctx *ctx = NULL;
937 int err = 0;
938
939 if (!fl->sctx)
940 return -EINVAL;
941
942 if (!fl->cctx->rpdev)
943 return -EPIPE;
944
945 ctx = fastrpc_context_alloc(fl, kernel, sc, args);
946 if (IS_ERR(ctx))
947 return PTR_ERR(ctx);
948
949 if (ctx->nscalars) {
950 err = fastrpc_get_args(kernel, ctx);
951 if (err)
952 goto bail;
953 }
954
955 /* make sure that all CPU memory writes are seen by DSP */
956 dma_wmb();
957 /* Send invoke buffer to remote dsp */
958 err = fastrpc_invoke_send(fl->sctx, ctx, kernel, handle);
959 if (err)
960 goto bail;
961
962 if (kernel) {
963 if (!wait_for_completion_timeout(&ctx->work, 10 * HZ))
964 err = -ETIMEDOUT;
965 } else {
966 err = wait_for_completion_interruptible(&ctx->work);
967 }
968
969 if (err)
970 goto bail;
971
972 /* Check the response from remote dsp */
973 err = ctx->retval;
974 if (err)
975 goto bail;
976
977 if (ctx->nscalars) {
978 /* make sure that all memory writes by DSP are seen by CPU */
979 dma_rmb();
980 /* populate all the output buffers with results */
981 err = fastrpc_put_args(ctx, kernel);
982 if (err)
983 goto bail;
984 }
985
986bail:
987 if (err != -ERESTARTSYS && err != -ETIMEDOUT) {
988 /* We are done with this compute context */
989 spin_lock(&fl->lock);
990 list_del(&ctx->node);
991 spin_unlock(&fl->lock);
992 fastrpc_context_put(ctx);
993 }
994 if (err)
995 dev_dbg(fl->sctx->dev, "Error: Invoke Failed %d\n", err);
996
997 return err;
998}
999
1000static int fastrpc_init_create_process(struct fastrpc_user *fl,
1001 char __user *argp)
1002{
1003 struct fastrpc_init_create init;
1004 struct fastrpc_invoke_args *args;
1005 struct fastrpc_phy_page pages[1];
1006 struct fastrpc_map *map = NULL;
1007 struct fastrpc_buf *imem = NULL;
1008 int memlen;
1009 int err;
1010 struct {
1011 int pgid;
1012 u32 namelen;
1013 u32 filelen;
1014 u32 pageslen;
1015 u32 attrs;
1016 u32 siglen;
1017 } inbuf;
1018 u32 sc;
1019
1020 args = kcalloc(FASTRPC_CREATE_PROCESS_NARGS, sizeof(*args), GFP_KERNEL);
1021 if (!args)
1022 return -ENOMEM;
1023
1024 if (copy_from_user(&init, argp, sizeof(init))) {
1025 err = -EFAULT;
1026 goto err;
1027 }
1028
1029 if (init.filelen > INIT_FILELEN_MAX) {
1030 err = -EINVAL;
1031 goto err;
1032 }
1033
1034 inbuf.pgid = fl->tgid;
1035 inbuf.namelen = strlen(current->comm) + 1;
1036 inbuf.filelen = init.filelen;
1037 inbuf.pageslen = 1;
1038 inbuf.attrs = init.attrs;
1039 inbuf.siglen = init.siglen;
1040 fl->pd = 1;
1041
1042 if (init.filelen && init.filefd) {
1043 err = fastrpc_map_create(fl, init.filefd, init.filelen, &map);
1044 if (err)
1045 goto err;
1046 }
1047
1048 memlen = ALIGN(max(INIT_FILELEN_MAX, (int)init.filelen * 4),
1049 1024 * 1024);
1050 err = fastrpc_buf_alloc(fl, fl->sctx->dev, memlen,
1051 &imem);
1052 if (err)
1053 goto err_alloc;
1054
1055 fl->init_mem = imem;
1056 args[0].ptr = (u64)(uintptr_t)&inbuf;
1057 args[0].length = sizeof(inbuf);
1058 args[0].fd = -1;
1059
1060 args[1].ptr = (u64)(uintptr_t)current->comm;
1061 args[1].length = inbuf.namelen;
1062 args[1].fd = -1;
1063
1064 args[2].ptr = (u64) init.file;
1065 args[2].length = inbuf.filelen;
1066 args[2].fd = init.filefd;
1067
1068 pages[0].addr = imem->phys;
1069 pages[0].size = imem->size;
1070
1071 args[3].ptr = (u64)(uintptr_t) pages;
1072 args[3].length = 1 * sizeof(*pages);
1073 args[3].fd = -1;
1074
1075 args[4].ptr = (u64)(uintptr_t)&inbuf.attrs;
1076 args[4].length = sizeof(inbuf.attrs);
1077 args[4].fd = -1;
1078
1079 args[5].ptr = (u64)(uintptr_t) &inbuf.siglen;
1080 args[5].length = sizeof(inbuf.siglen);
1081 args[5].fd = -1;
1082
1083 sc = FASTRPC_SCALARS(FASTRPC_RMID_INIT_CREATE, 4, 0);
1084 if (init.attrs)
1085 sc = FASTRPC_SCALARS(FASTRPC_RMID_INIT_CREATE_ATTR, 6, 0);
1086
1087 err = fastrpc_internal_invoke(fl, true, FASTRPC_INIT_HANDLE,
1088 sc, args);
1089 if (err)
1090 goto err_invoke;
1091
1092 kfree(args);
1093
1094 return 0;
1095
1096err_invoke:
1097 fl->init_mem = NULL;
1098 fastrpc_buf_free(imem);
1099err_alloc:
1100 if (map) {
1101 spin_lock(&fl->lock);
1102 list_del(&map->node);
1103 spin_unlock(&fl->lock);
1104 fastrpc_map_put(map);
1105 }
1106err:
1107 kfree(args);
1108
1109 return err;
1110}
1111
1112static struct fastrpc_session_ctx *fastrpc_session_alloc(
1113 struct fastrpc_channel_ctx *cctx)
1114{
1115 struct fastrpc_session_ctx *session = NULL;
1116 unsigned long flags;
1117 int i;
1118
1119 spin_lock_irqsave(&cctx->lock, flags);
1120 for (i = 0; i < cctx->sesscount; i++) {
1121 if (!cctx->session[i].used && cctx->session[i].valid) {
1122 cctx->session[i].used = true;
1123 session = &cctx->session[i];
1124 break;
1125 }
1126 }
1127 spin_unlock_irqrestore(&cctx->lock, flags);
1128
1129 return session;
1130}
1131
1132static void fastrpc_session_free(struct fastrpc_channel_ctx *cctx,
1133 struct fastrpc_session_ctx *session)
1134{
1135 unsigned long flags;
1136
1137 spin_lock_irqsave(&cctx->lock, flags);
1138 session->used = false;
1139 spin_unlock_irqrestore(&cctx->lock, flags);
1140}
1141
1142static int fastrpc_release_current_dsp_process(struct fastrpc_user *fl)
1143{
1144 struct fastrpc_invoke_args args[1];
1145 int tgid = 0;
1146 u32 sc;
1147
1148 tgid = fl->tgid;
1149 args[0].ptr = (u64)(uintptr_t) &tgid;
1150 args[0].length = sizeof(tgid);
1151 args[0].fd = -1;
1152 args[0].reserved = 0;
1153 sc = FASTRPC_SCALARS(FASTRPC_RMID_INIT_RELEASE, 1, 0);
1154
1155 return fastrpc_internal_invoke(fl, true, FASTRPC_INIT_HANDLE,
1156 sc, &args[0]);
1157}
1158
1159static int fastrpc_device_release(struct inode *inode, struct file *file)
1160{
1161 struct fastrpc_user *fl = (struct fastrpc_user *)file->private_data;
1162 struct fastrpc_channel_ctx *cctx = fl->cctx;
1163 struct fastrpc_invoke_ctx *ctx, *n;
1164 struct fastrpc_map *map, *m;
1165 struct fastrpc_buf *buf, *b;
1166 unsigned long flags;
1167
1168 fastrpc_release_current_dsp_process(fl);
1169
1170 spin_lock_irqsave(&cctx->lock, flags);
1171 list_del(&fl->user);
1172 spin_unlock_irqrestore(&cctx->lock, flags);
1173
1174 if (fl->init_mem)
1175 fastrpc_buf_free(fl->init_mem);
1176
1177 list_for_each_entry_safe(ctx, n, &fl->pending, node) {
1178 list_del(&ctx->node);
1179 fastrpc_context_put(ctx);
1180 }
1181
1182 list_for_each_entry_safe(map, m, &fl->maps, node) {
1183 list_del(&map->node);
1184 fastrpc_map_put(map);
1185 }
1186
1187 list_for_each_entry_safe(buf, b, &fl->mmaps, node) {
1188 list_del(&buf->node);
1189 fastrpc_buf_free(buf);
1190 }
1191
1192 fastrpc_session_free(cctx, fl->sctx);
1193 fastrpc_channel_ctx_put(cctx);
1194
1195 mutex_destroy(&fl->mutex);
1196 kfree(fl);
1197 file->private_data = NULL;
1198
1199 return 0;
1200}
1201
1202static int fastrpc_device_open(struct inode *inode, struct file *filp)
1203{
1204 struct fastrpc_channel_ctx *cctx = miscdev_to_cctx(filp->private_data);
1205 struct fastrpc_user *fl = NULL;
1206 unsigned long flags;
1207
1208 fl = kzalloc(sizeof(*fl), GFP_KERNEL);
1209 if (!fl)
1210 return -ENOMEM;
1211
1212 /* Released in fastrpc_device_release() */
1213 fastrpc_channel_ctx_get(cctx);
1214
1215 filp->private_data = fl;
1216 spin_lock_init(&fl->lock);
1217 mutex_init(&fl->mutex);
1218 INIT_LIST_HEAD(&fl->pending);
1219 INIT_LIST_HEAD(&fl->maps);
1220 INIT_LIST_HEAD(&fl->mmaps);
1221 INIT_LIST_HEAD(&fl->user);
1222 fl->tgid = current->tgid;
1223 fl->cctx = cctx;
1224
1225 fl->sctx = fastrpc_session_alloc(cctx);
1226 if (!fl->sctx) {
1227 dev_err(&cctx->rpdev->dev, "No session available\n");
1228 mutex_destroy(&fl->mutex);
1229 kfree(fl);
1230
1231 return -EBUSY;
1232 }
1233
1234 spin_lock_irqsave(&cctx->lock, flags);
1235 list_add_tail(&fl->user, &cctx->users);
1236 spin_unlock_irqrestore(&cctx->lock, flags);
1237
1238 return 0;
1239}
1240
1241static int fastrpc_dmabuf_alloc(struct fastrpc_user *fl, char __user *argp)
1242{
1243 struct fastrpc_alloc_dma_buf bp;
1244 DEFINE_DMA_BUF_EXPORT_INFO(exp_info);
1245 struct fastrpc_buf *buf = NULL;
1246 int err;
1247
1248 if (copy_from_user(&bp, argp, sizeof(bp)))
1249 return -EFAULT;
1250
1251 err = fastrpc_buf_alloc(fl, fl->sctx->dev, bp.size, &buf);
1252 if (err)
1253 return err;
1254 exp_info.ops = &fastrpc_dma_buf_ops;
1255 exp_info.size = bp.size;
1256 exp_info.flags = O_RDWR;
1257 exp_info.priv = buf;
1258 buf->dmabuf = dma_buf_export(&exp_info);
1259 if (IS_ERR(buf->dmabuf)) {
1260 err = PTR_ERR(buf->dmabuf);
1261 fastrpc_buf_free(buf);
1262 return err;
1263 }
1264
1265 bp.fd = dma_buf_fd(buf->dmabuf, O_ACCMODE);
1266 if (bp.fd < 0) {
1267 dma_buf_put(buf->dmabuf);
1268 return -EINVAL;
1269 }
1270
1271 if (copy_to_user(argp, &bp, sizeof(bp))) {
1272 dma_buf_put(buf->dmabuf);
1273 return -EFAULT;
1274 }
1275
1276 return 0;
1277}
1278
1279static int fastrpc_init_attach(struct fastrpc_user *fl)
1280{
1281 struct fastrpc_invoke_args args[1];
1282 int tgid = fl->tgid;
1283 u32 sc;
1284
1285 args[0].ptr = (u64)(uintptr_t) &tgid;
1286 args[0].length = sizeof(tgid);
1287 args[0].fd = -1;
1288 args[0].reserved = 0;
1289 sc = FASTRPC_SCALARS(FASTRPC_RMID_INIT_ATTACH, 1, 0);
1290 fl->pd = 0;
1291
1292 return fastrpc_internal_invoke(fl, true, FASTRPC_INIT_HANDLE,
1293 sc, &args[0]);
1294}
1295
1296static int fastrpc_invoke(struct fastrpc_user *fl, char __user *argp)
1297{
1298 struct fastrpc_invoke_args *args = NULL;
1299 struct fastrpc_invoke inv;
1300 u32 nscalars;
1301 int err;
1302
1303 if (copy_from_user(&inv, argp, sizeof(inv)))
1304 return -EFAULT;
1305
1306 /* nscalars is truncated here to max supported value */
1307 nscalars = REMOTE_SCALARS_LENGTH(inv.sc);
1308 if (nscalars) {
1309 args = kcalloc(nscalars, sizeof(*args), GFP_KERNEL);
1310 if (!args)
1311 return -ENOMEM;
1312
1313 if (copy_from_user(args, (void __user *)(uintptr_t)inv.args,
1314 nscalars * sizeof(*args))) {
1315 kfree(args);
1316 return -EFAULT;
1317 }
1318 }
1319
1320 err = fastrpc_internal_invoke(fl, false, inv.handle, inv.sc, args);
1321 kfree(args);
1322
1323 return err;
1324}
1325
1326static int fastrpc_req_munmap_impl(struct fastrpc_user *fl,
1327 struct fastrpc_req_munmap *req)
1328{
1329 struct fastrpc_invoke_args args[1] = { [0] = { 0 } };
1330 struct fastrpc_buf *buf, *b;
1331 struct fastrpc_munmap_req_msg req_msg;
1332 struct device *dev = fl->sctx->dev;
1333 int err;
1334 u32 sc;
1335
1336 spin_lock(&fl->lock);
1337 list_for_each_entry_safe(buf, b, &fl->mmaps, node) {
1338 if ((buf->raddr == req->vaddrout) && (buf->size == req->size))
1339 break;
1340 buf = NULL;
1341 }
1342 spin_unlock(&fl->lock);
1343
1344 if (!buf) {
1345 dev_err(dev, "mmap not in list\n");
1346 return -EINVAL;
1347 }
1348
1349 req_msg.pgid = fl->tgid;
1350 req_msg.size = buf->size;
1351 req_msg.vaddr = buf->raddr;
1352
1353 args[0].ptr = (u64) (uintptr_t) &req_msg;
1354 args[0].length = sizeof(req_msg);
1355
1356 sc = FASTRPC_SCALARS(FASTRPC_RMID_INIT_MUNMAP, 1, 0);
1357 err = fastrpc_internal_invoke(fl, true, FASTRPC_INIT_HANDLE, sc,
1358 &args[0]);
1359 if (!err) {
1360 dev_dbg(dev, "unmmap\tpt 0x%09lx OK\n", buf->raddr);
1361 spin_lock(&fl->lock);
1362 list_del(&buf->node);
1363 spin_unlock(&fl->lock);
1364 fastrpc_buf_free(buf);
1365 } else {
1366 dev_err(dev, "unmmap\tpt 0x%09lx ERROR\n", buf->raddr);
1367 }
1368
1369 return err;
1370}
1371
1372static int fastrpc_req_munmap(struct fastrpc_user *fl, char __user *argp)
1373{
1374 struct fastrpc_req_munmap req;
1375
1376 if (copy_from_user(&req, argp, sizeof(req)))
1377 return -EFAULT;
1378
1379 return fastrpc_req_munmap_impl(fl, &req);
1380}
1381
1382static int fastrpc_req_mmap(struct fastrpc_user *fl, char __user *argp)
1383{
1384 struct fastrpc_invoke_args args[3] = { [0 ... 2] = { 0 } };
1385 struct fastrpc_buf *buf = NULL;
1386 struct fastrpc_mmap_req_msg req_msg;
1387 struct fastrpc_mmap_rsp_msg rsp_msg;
1388 struct fastrpc_req_munmap req_unmap;
1389 struct fastrpc_phy_page pages;
1390 struct fastrpc_req_mmap req;
1391 struct device *dev = fl->sctx->dev;
1392 int err;
1393 u32 sc;
1394
1395 if (copy_from_user(&req, argp, sizeof(req)))
1396 return -EFAULT;
1397
1398 if (req.flags != ADSP_MMAP_ADD_PAGES) {
1399 dev_err(dev, "flag not supported 0x%x\n", req.flags);
1400 return -EINVAL;
1401 }
1402
1403 if (req.vaddrin) {
1404 dev_err(dev, "adding user allocated pages is not supported\n");
1405 return -EINVAL;
1406 }
1407
1408 err = fastrpc_buf_alloc(fl, fl->sctx->dev, req.size, &buf);
1409 if (err) {
1410 dev_err(dev, "failed to allocate buffer\n");
1411 return err;
1412 }
1413
1414 req_msg.pgid = fl->tgid;
1415 req_msg.flags = req.flags;
1416 req_msg.vaddr = req.vaddrin;
1417 req_msg.num = sizeof(pages);
1418
1419 args[0].ptr = (u64) (uintptr_t) &req_msg;
1420 args[0].length = sizeof(req_msg);
1421
1422 pages.addr = buf->phys;
1423 pages.size = buf->size;
1424
1425 args[1].ptr = (u64) (uintptr_t) &pages;
1426 args[1].length = sizeof(pages);
1427
1428 args[2].ptr = (u64) (uintptr_t) &rsp_msg;
1429 args[2].length = sizeof(rsp_msg);
1430
1431 sc = FASTRPC_SCALARS(FASTRPC_RMID_INIT_MMAP, 2, 1);
1432 err = fastrpc_internal_invoke(fl, true, FASTRPC_INIT_HANDLE, sc,
1433 &args[0]);
1434 if (err) {
1435 dev_err(dev, "mmap error (len 0x%08llx)\n", buf->size);
1436 goto err_invoke;
1437 }
1438
1439 /* update the buffer to be able to deallocate the memory on the DSP */
1440 buf->raddr = (uintptr_t) rsp_msg.vaddr;
1441
1442 /* let the client know the address to use */
1443 req.vaddrout = rsp_msg.vaddr;
1444
1445 spin_lock(&fl->lock);
1446 list_add_tail(&buf->node, &fl->mmaps);
1447 spin_unlock(&fl->lock);
1448
1449 if (copy_to_user((void __user *)argp, &req, sizeof(req))) {
1450 /* unmap the memory and release the buffer */
1451 req_unmap.vaddrout = buf->raddr;
1452 req_unmap.size = buf->size;
1453 fastrpc_req_munmap_impl(fl, &req_unmap);
1454 return -EFAULT;
1455 }
1456
1457 dev_dbg(dev, "mmap\t\tpt 0x%09lx OK [len 0x%08llx]\n",
1458 buf->raddr, buf->size);
1459
1460 return 0;
1461
1462err_invoke:
1463 fastrpc_buf_free(buf);
1464
1465 return err;
1466}
1467
1468static long fastrpc_device_ioctl(struct file *file, unsigned int cmd,
1469 unsigned long arg)
1470{
1471 struct fastrpc_user *fl = (struct fastrpc_user *)file->private_data;
1472 char __user *argp = (char __user *)arg;
1473 int err;
1474
1475 switch (cmd) {
1476 case FASTRPC_IOCTL_INVOKE:
1477 err = fastrpc_invoke(fl, argp);
1478 break;
1479 case FASTRPC_IOCTL_INIT_ATTACH:
1480 err = fastrpc_init_attach(fl);
1481 break;
1482 case FASTRPC_IOCTL_INIT_CREATE:
1483 err = fastrpc_init_create_process(fl, argp);
1484 break;
1485 case FASTRPC_IOCTL_ALLOC_DMA_BUFF:
1486 err = fastrpc_dmabuf_alloc(fl, argp);
1487 break;
1488 case FASTRPC_IOCTL_MMAP:
1489 err = fastrpc_req_mmap(fl, argp);
1490 break;
1491 case FASTRPC_IOCTL_MUNMAP:
1492 err = fastrpc_req_munmap(fl, argp);
1493 break;
1494 default:
1495 err = -ENOTTY;
1496 break;
1497 }
1498
1499 return err;
1500}
1501
1502static const struct file_operations fastrpc_fops = {
1503 .open = fastrpc_device_open,
1504 .release = fastrpc_device_release,
1505 .unlocked_ioctl = fastrpc_device_ioctl,
1506 .compat_ioctl = fastrpc_device_ioctl,
1507};
1508
1509static int fastrpc_cb_probe(struct platform_device *pdev)
1510{
1511 struct fastrpc_channel_ctx *cctx;
1512 struct fastrpc_session_ctx *sess;
1513 struct device *dev = &pdev->dev;
1514 int i, sessions = 0;
1515 unsigned long flags;
1516 int rc;
1517
1518 cctx = dev_get_drvdata(dev->parent);
1519 if (!cctx)
1520 return -EINVAL;
1521
1522 of_property_read_u32(dev->of_node, "qcom,nsessions", &sessions);
1523
1524 spin_lock_irqsave(&cctx->lock, flags);
1525 sess = &cctx->session[cctx->sesscount];
1526 sess->used = false;
1527 sess->valid = true;
1528 sess->dev = dev;
1529 dev_set_drvdata(dev, sess);
1530
1531 if (of_property_read_u32(dev->of_node, "reg", &sess->sid))
1532 dev_info(dev, "FastRPC Session ID not specified in DT\n");
1533
1534 if (sessions > 0) {
1535 struct fastrpc_session_ctx *dup_sess;
1536
1537 for (i = 1; i < sessions; i++) {
1538 if (cctx->sesscount++ >= FASTRPC_MAX_SESSIONS)
1539 break;
1540 dup_sess = &cctx->session[cctx->sesscount];
1541 memcpy(dup_sess, sess, sizeof(*dup_sess));
1542 }
1543 }
1544 cctx->sesscount++;
1545 spin_unlock_irqrestore(&cctx->lock, flags);
1546 rc = dma_set_mask(dev, DMA_BIT_MASK(32));
1547 if (rc) {
1548 dev_err(dev, "32-bit DMA enable failed\n");
1549 return rc;
1550 }
1551
1552 return 0;
1553}
1554
1555static int fastrpc_cb_remove(struct platform_device *pdev)
1556{
1557 struct fastrpc_channel_ctx *cctx = dev_get_drvdata(pdev->dev.parent);
1558 struct fastrpc_session_ctx *sess = dev_get_drvdata(&pdev->dev);
1559 unsigned long flags;
1560 int i;
1561
1562 spin_lock_irqsave(&cctx->lock, flags);
1563 for (i = 1; i < FASTRPC_MAX_SESSIONS; i++) {
1564 if (cctx->session[i].sid == sess->sid) {
1565 cctx->session[i].valid = false;
1566 cctx->sesscount--;
1567 }
1568 }
1569 spin_unlock_irqrestore(&cctx->lock, flags);
1570
1571 return 0;
1572}
1573
1574static const struct of_device_id fastrpc_match_table[] = {
1575 { .compatible = "qcom,fastrpc-compute-cb", },
1576 {}
1577};
1578
1579static struct platform_driver fastrpc_cb_driver = {
1580 .probe = fastrpc_cb_probe,
1581 .remove = fastrpc_cb_remove,
1582 .driver = {
1583 .name = "qcom,fastrpc-cb",
1584 .of_match_table = fastrpc_match_table,
1585 .suppress_bind_attrs = true,
1586 },
1587};
1588
1589static int fastrpc_rpmsg_probe(struct rpmsg_device *rpdev)
1590{
1591 struct device *rdev = &rpdev->dev;
1592 struct fastrpc_channel_ctx *data;
1593 int i, err, domain_id = -1;
1594 const char *domain;
1595
1596 err = of_property_read_string(rdev->of_node, "label", &domain);
1597 if (err) {
1598 dev_info(rdev, "FastRPC Domain not specified in DT\n");
1599 return err;
1600 }
1601
1602 for (i = 0; i <= CDSP_DOMAIN_ID; i++) {
1603 if (!strcmp(domains[i], domain)) {
1604 domain_id = i;
1605 break;
1606 }
1607 }
1608
1609 if (domain_id < 0) {
1610 dev_info(rdev, "FastRPC Invalid Domain ID %d\n", domain_id);
1611 return -EINVAL;
1612 }
1613
1614 data = kzalloc(sizeof(*data), GFP_KERNEL);
1615 if (!data)
1616 return -ENOMEM;
1617
1618 data->miscdev.minor = MISC_DYNAMIC_MINOR;
1619 data->miscdev.name = devm_kasprintf(rdev, GFP_KERNEL, "fastrpc-%s",
1620 domains[domain_id]);
1621 data->miscdev.fops = &fastrpc_fops;
1622 err = misc_register(&data->miscdev);
1623 if (err) {
1624 kfree(data);
1625 return err;
1626 }
1627
1628 kref_init(&data->refcount);
1629
1630 dev_set_drvdata(&rpdev->dev, data);
1631 dma_set_mask_and_coherent(rdev, DMA_BIT_MASK(32));
1632 INIT_LIST_HEAD(&data->users);
1633 spin_lock_init(&data->lock);
1634 idr_init(&data->ctx_idr);
1635 data->domain_id = domain_id;
1636 data->rpdev = rpdev;
1637
1638 return of_platform_populate(rdev->of_node, NULL, NULL, rdev);
1639}
1640
1641static void fastrpc_notify_users(struct fastrpc_user *user)
1642{
1643 struct fastrpc_invoke_ctx *ctx;
1644
1645 spin_lock(&user->lock);
1646 list_for_each_entry(ctx, &user->pending, node)
1647 complete(&ctx->work);
1648 spin_unlock(&user->lock);
1649}
1650
1651static void fastrpc_rpmsg_remove(struct rpmsg_device *rpdev)
1652{
1653 struct fastrpc_channel_ctx *cctx = dev_get_drvdata(&rpdev->dev);
1654 struct fastrpc_user *user;
1655 unsigned long flags;
1656
1657 spin_lock_irqsave(&cctx->lock, flags);
1658 list_for_each_entry(user, &cctx->users, user)
1659 fastrpc_notify_users(user);
1660 spin_unlock_irqrestore(&cctx->lock, flags);
1661
1662 misc_deregister(&cctx->miscdev);
1663 of_platform_depopulate(&rpdev->dev);
1664
1665 cctx->rpdev = NULL;
1666 fastrpc_channel_ctx_put(cctx);
1667}
1668
1669static int fastrpc_rpmsg_callback(struct rpmsg_device *rpdev, void *data,
1670 int len, void *priv, u32 addr)
1671{
1672 struct fastrpc_channel_ctx *cctx = dev_get_drvdata(&rpdev->dev);
1673 struct fastrpc_invoke_rsp *rsp = data;
1674 struct fastrpc_invoke_ctx *ctx;
1675 unsigned long flags;
1676 unsigned long ctxid;
1677
1678 if (len < sizeof(*rsp))
1679 return -EINVAL;
1680
1681 ctxid = ((rsp->ctx & FASTRPC_CTXID_MASK) >> 4);
1682
1683 spin_lock_irqsave(&cctx->lock, flags);
1684 ctx = idr_find(&cctx->ctx_idr, ctxid);
1685 spin_unlock_irqrestore(&cctx->lock, flags);
1686
1687 if (!ctx) {
1688 dev_err(&rpdev->dev, "No context ID matches response\n");
1689 return -ENOENT;
1690 }
1691
1692 ctx->retval = rsp->retval;
1693 complete(&ctx->work);
1694
1695 /*
1696 * The DMA buffer associated with the context cannot be freed in
1697 * interrupt context so schedule it through a worker thread to
1698 * avoid a kernel BUG.
1699 */
1700 schedule_work(&ctx->put_work);
1701
1702 return 0;
1703}
1704
1705static const struct of_device_id fastrpc_rpmsg_of_match[] = {
1706 { .compatible = "qcom,fastrpc" },
1707 { },
1708};
1709MODULE_DEVICE_TABLE(of, fastrpc_rpmsg_of_match);
1710
1711static struct rpmsg_driver fastrpc_driver = {
1712 .probe = fastrpc_rpmsg_probe,
1713 .remove = fastrpc_rpmsg_remove,
1714 .callback = fastrpc_rpmsg_callback,
1715 .drv = {
1716 .name = "qcom,fastrpc",
1717 .of_match_table = fastrpc_rpmsg_of_match,
1718 },
1719};
1720
1721static int fastrpc_init(void)
1722{
1723 int ret;
1724
1725 ret = platform_driver_register(&fastrpc_cb_driver);
1726 if (ret < 0) {
1727 pr_err("fastrpc: failed to register cb driver\n");
1728 return ret;
1729 }
1730
1731 ret = register_rpmsg_driver(&fastrpc_driver);
1732 if (ret < 0) {
1733 pr_err("fastrpc: failed to register rpmsg driver\n");
1734 platform_driver_unregister(&fastrpc_cb_driver);
1735 return ret;
1736 }
1737
1738 return 0;
1739}
1740module_init(fastrpc_init);
1741
1742static void fastrpc_exit(void)
1743{
1744 platform_driver_unregister(&fastrpc_cb_driver);
1745 unregister_rpmsg_driver(&fastrpc_driver);
1746}
1747module_exit(fastrpc_exit);
1748
1749MODULE_LICENSE("GPL v2");