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treewide: remove redundant IS_ERR() before error code check
[linux/fpc-iii.git] / drivers / misc / fastrpc.c
blobe3e085e33d46bffff855307269592d0452aa92e6
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
78 static const char *domains[FASTRPC_DEV_MAX] = { "adsp", "mdsp",
79 "sdsp", "cdsp"};
80 struct fastrpc_phy_page {
81 u64 addr; /* physical address */
82 u64 size; /* size of contiguous region */
83 };
84
85 struct fastrpc_invoke_buf {
86 u32 num; /* number of contiguous regions */
87 u32 pgidx; /* index to start of contiguous region */
88 };
89
90 struct fastrpc_remote_arg {
91 u64 pv;
92 u64 len;
93 };
94
95 struct fastrpc_mmap_rsp_msg {
96 u64 vaddr;
97 };
98
99 struct fastrpc_mmap_req_msg {
100 s32 pgid;
101 u32 flags;
102 u64 vaddr;
103 s32 num;
104 };
105
106 struct fastrpc_munmap_req_msg {
107 s32 pgid;
108 u64 vaddr;
109 u64 size;
110 };
111
112 struct 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
122 struct fastrpc_invoke_rsp {
123 u64 ctx; /* invoke caller context */
124 int retval; /* invoke return value */
125 };
126
127 struct fastrpc_buf_overlap {
128 u64 start;
129 u64 end;
130 int raix;
131 u64 mstart;
132 u64 mend;
133 u64 offset;
134 };
135
136 struct 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
151 struct fastrpc_dma_buf_attachment {
152 struct device *dev;
153 struct sg_table sgt;
154 struct list_head node;
155 };
156
157 struct 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
171 struct 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
195 struct fastrpc_session_ctx {
196 struct device *dev;
197 int sid;
198 bool used;
199 bool valid;
200 };
201
202 struct 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
214 struct 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
232 static 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
248 static void fastrpc_map_put(struct fastrpc_map *map)
249 {
250 if (map)
251 kref_put(&map->refcount, fastrpc_free_map);
252 }
253
254 static void fastrpc_map_get(struct fastrpc_map *map)
255 {
256 if (map)
257 kref_get(&map->refcount);
258 }
259
260 static 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
279 static 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
286 static 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
322 static 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
331 static void fastrpc_channel_ctx_get(struct fastrpc_channel_ctx *cctx)
332 {
333 kref_get(&cctx->refcount);
334 }
335
336 static void fastrpc_channel_ctx_put(struct fastrpc_channel_ctx *cctx)
337 {
338 kref_put(&cctx->refcount, fastrpc_channel_ctx_free);
339 }
340
341 static 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
368 static void fastrpc_context_get(struct fastrpc_invoke_ctx *ctx)
369 {
370 kref_get(&ctx->refcount);
371 }
372
373 static void fastrpc_context_put(struct fastrpc_invoke_ctx *ctx)
374 {
375 kref_put(&ctx->refcount, fastrpc_context_free);
376 }
377
378 static 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)
387 static 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
399 static 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
435 static 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;
500 err_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
512 static struct sg_table *
513 fastrpc_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
527 static 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
534 static void fastrpc_release(struct dma_buf *dmabuf)
535 {
536 struct fastrpc_buf *buffer = dmabuf->priv;
537
538 fastrpc_buf_free(buffer);
539 }
540
541 static 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
571 static 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
584 static void *fastrpc_vmap(struct dma_buf *dmabuf)
585 {
586 struct fastrpc_buf *buf = dmabuf->priv;
587
588 return buf->virt;
589 }
590
591 static 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
601 static 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
611 static 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
661 map_err:
662 dma_buf_detach(map->buf, map->attach);
663 attach_err:
664 dma_buf_put(map->buf);
665 get_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
698 static 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
711 static 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
730 static 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
755 static 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
869 bail:
870 if (err)
871 dev_err(dev, "Error: get invoke args failed:%d\n", err);
872
873 return err;
874 }
875
876 static 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
900 static 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
908 cctx = fl->cctx;
909 msg->pid = fl->tgid;
910 msg->tid = current->pid;
911
912 if (kernel)
913 msg->pid = 0;
914
915 msg->ctx = ctx->ctxid | fl->pd;
916 msg->handle = handle;
917 msg->sc = ctx->sc;
918 msg->addr = ctx->buf ? ctx->buf->phys : 0;
919 msg->size = roundup(ctx->msg_sz, PAGE_SIZE);
920 fastrpc_context_get(ctx);
921
922 return rpmsg_send(cctx->rpdev->ept, (void *)msg, sizeof(*msg));
923 }
924
925 static int fastrpc_internal_invoke(struct fastrpc_user *fl, u32 kernel,
926 u32 handle, u32 sc,
927 struct fastrpc_invoke_args *args)
928 {
929 struct fastrpc_invoke_ctx *ctx = NULL;
930 int err = 0;
931
932 if (!fl->sctx)
933 return -EINVAL;
934
935 if (!fl->cctx->rpdev)
936 return -EPIPE;
937
938 ctx = fastrpc_context_alloc(fl, kernel, sc, args);
939 if (IS_ERR(ctx))
940 return PTR_ERR(ctx);
941
942 if (ctx->nscalars) {
943 err = fastrpc_get_args(kernel, ctx);
944 if (err)
945 goto bail;
946 }
947
948 /* make sure that all CPU memory writes are seen by DSP */
949 dma_wmb();
950 /* Send invoke buffer to remote dsp */
951 err = fastrpc_invoke_send(fl->sctx, ctx, kernel, handle);
952 if (err)
953 goto bail;
954
955 if (kernel) {
956 if (!wait_for_completion_timeout(&ctx->work, 10 * HZ))
957 err = -ETIMEDOUT;
958 } else {
959 err = wait_for_completion_interruptible(&ctx->work);
960 }
961
962 if (err)
963 goto bail;
964
965 /* Check the response from remote dsp */
966 err = ctx->retval;
967 if (err)
968 goto bail;
969
970 if (ctx->nscalars) {
971 /* make sure that all memory writes by DSP are seen by CPU */
972 dma_rmb();
973 /* populate all the output buffers with results */
974 err = fastrpc_put_args(ctx, kernel);
975 if (err)
976 goto bail;
977 }
978
979 bail:
980 if (err != -ERESTARTSYS && err != -ETIMEDOUT) {
981 /* We are done with this compute context */
982 spin_lock(&fl->lock);
983 list_del(&ctx->node);
984 spin_unlock(&fl->lock);
985 fastrpc_context_put(ctx);
986 }
987 if (err)
988 dev_dbg(fl->sctx->dev, "Error: Invoke Failed %d\n", err);
989
990 return err;
991 }
992
993 static int fastrpc_init_create_process(struct fastrpc_user *fl,
994 char __user *argp)
995 {
996 struct fastrpc_init_create init;
997 struct fastrpc_invoke_args *args;
998 struct fastrpc_phy_page pages[1];
999 struct fastrpc_map *map = NULL;
1000 struct fastrpc_buf *imem = NULL;
1001 int memlen;
1002 int err;
1003 struct {
1004 int pgid;
1005 u32 namelen;
1006 u32 filelen;
1007 u32 pageslen;
1008 u32 attrs;
1009 u32 siglen;
1010 } inbuf;
1011 u32 sc;
1012
1013 args = kcalloc(FASTRPC_CREATE_PROCESS_NARGS, sizeof(*args), GFP_KERNEL);
1014 if (!args)
1015 return -ENOMEM;
1016
1017 if (copy_from_user(&init, argp, sizeof(init))) {
1018 err = -EFAULT;
1019 goto err;
1020 }
1021
1022 if (init.filelen > INIT_FILELEN_MAX) {
1023 err = -EINVAL;
1024 goto err;
1025 }
1026
1027 inbuf.pgid = fl->tgid;
1028 inbuf.namelen = strlen(current->comm) + 1;
1029 inbuf.filelen = init.filelen;
1030 inbuf.pageslen = 1;
1031 inbuf.attrs = init.attrs;
1032 inbuf.siglen = init.siglen;
1033 fl->pd = 1;
1034
1035 if (init.filelen && init.filefd) {
1036 err = fastrpc_map_create(fl, init.filefd, init.filelen, &map);
1037 if (err)
1038 goto err;
1039 }
1040
1041 memlen = ALIGN(max(INIT_FILELEN_MAX, (int)init.filelen * 4),
1042 1024 * 1024);
1043 err = fastrpc_buf_alloc(fl, fl->sctx->dev, memlen,
1044 &imem);
1045 if (err)
1046 goto err_alloc;
1047
1048 fl->init_mem = imem;
1049 args[0].ptr = (u64)(uintptr_t)&inbuf;
1050 args[0].length = sizeof(inbuf);
1051 args[0].fd = -1;
1052
1053 args[1].ptr = (u64)(uintptr_t)current->comm;
1054 args[1].length = inbuf.namelen;
1055 args[1].fd = -1;
1056
1057 args[2].ptr = (u64) init.file;
1058 args[2].length = inbuf.filelen;
1059 args[2].fd = init.filefd;
1060
1061 pages[0].addr = imem->phys;
1062 pages[0].size = imem->size;
1063
1064 args[3].ptr = (u64)(uintptr_t) pages;
1065 args[3].length = 1 * sizeof(*pages);
1066 args[3].fd = -1;
1067
1068 args[4].ptr = (u64)(uintptr_t)&inbuf.attrs;
1069 args[4].length = sizeof(inbuf.attrs);
1070 args[4].fd = -1;
1071
1072 args[5].ptr = (u64)(uintptr_t) &inbuf.siglen;
1073 args[5].length = sizeof(inbuf.siglen);
1074 args[5].fd = -1;
1075
1076 sc = FASTRPC_SCALARS(FASTRPC_RMID_INIT_CREATE, 4, 0);
1077 if (init.attrs)
1078 sc = FASTRPC_SCALARS(FASTRPC_RMID_INIT_CREATE_ATTR, 6, 0);
1079
1080 err = fastrpc_internal_invoke(fl, true, FASTRPC_INIT_HANDLE,
1081 sc, args);
1082 if (err)
1083 goto err_invoke;
1084
1085 kfree(args);
1086
1087 return 0;
1088
1089 err_invoke:
1090 fl->init_mem = NULL;
1091 fastrpc_buf_free(imem);
1092 err_alloc:
1093 if (map) {
1094 spin_lock(&fl->lock);
1095 list_del(&map->node);
1096 spin_unlock(&fl->lock);
1097 fastrpc_map_put(map);
1098 }
1099 err:
1100 kfree(args);
1101
1102 return err;
1103 }
1104
1105 static struct fastrpc_session_ctx *fastrpc_session_alloc(
1106 struct fastrpc_channel_ctx *cctx)
1107 {
1108 struct fastrpc_session_ctx *session = NULL;
1109 unsigned long flags;
1110 int i;
1111
1112 spin_lock_irqsave(&cctx->lock, flags);
1113 for (i = 0; i < cctx->sesscount; i++) {
1114 if (!cctx->session[i].used && cctx->session[i].valid) {
1115 cctx->session[i].used = true;
1116 session = &cctx->session[i];
1117 break;
1118 }
1119 }
1120 spin_unlock_irqrestore(&cctx->lock, flags);
1121
1122 return session;
1123 }
1124
1125 static void fastrpc_session_free(struct fastrpc_channel_ctx *cctx,
1126 struct fastrpc_session_ctx *session)
1127 {
1128 unsigned long flags;
1129
1130 spin_lock_irqsave(&cctx->lock, flags);
1131 session->used = false;
1132 spin_unlock_irqrestore(&cctx->lock, flags);
1133 }
1134
1135 static int fastrpc_release_current_dsp_process(struct fastrpc_user *fl)
1136 {
1137 struct fastrpc_invoke_args args[1];
1138 int tgid = 0;
1139 u32 sc;
1140
1141 tgid = fl->tgid;
1142 args[0].ptr = (u64)(uintptr_t) &tgid;
1143 args[0].length = sizeof(tgid);
1144 args[0].fd = -1;
1145 args[0].reserved = 0;
1146 sc = FASTRPC_SCALARS(FASTRPC_RMID_INIT_RELEASE, 1, 0);
1147
1148 return fastrpc_internal_invoke(fl, true, FASTRPC_INIT_HANDLE,
1149 sc, &args[0]);
1150 }
1151
1152 static int fastrpc_device_release(struct inode *inode, struct file *file)
1153 {
1154 struct fastrpc_user *fl = (struct fastrpc_user *)file->private_data;
1155 struct fastrpc_channel_ctx *cctx = fl->cctx;
1156 struct fastrpc_invoke_ctx *ctx, *n;
1157 struct fastrpc_map *map, *m;
1158 struct fastrpc_buf *buf, *b;
1159 unsigned long flags;
1160
1161 fastrpc_release_current_dsp_process(fl);
1162
1163 spin_lock_irqsave(&cctx->lock, flags);
1164 list_del(&fl->user);
1165 spin_unlock_irqrestore(&cctx->lock, flags);
1166
1167 if (fl->init_mem)
1168 fastrpc_buf_free(fl->init_mem);
1169
1170 list_for_each_entry_safe(ctx, n, &fl->pending, node) {
1171 list_del(&ctx->node);
1172 fastrpc_context_put(ctx);
1173 }
1174
1175 list_for_each_entry_safe(map, m, &fl->maps, node) {
1176 list_del(&map->node);
1177 fastrpc_map_put(map);
1178 }
1179
1180 list_for_each_entry_safe(buf, b, &fl->mmaps, node) {
1181 list_del(&buf->node);
1182 fastrpc_buf_free(buf);
1183 }
1184
1185 fastrpc_session_free(cctx, fl->sctx);
1186 fastrpc_channel_ctx_put(cctx);
1187
1188 mutex_destroy(&fl->mutex);
1189 kfree(fl);
1190 file->private_data = NULL;
1191
1192 return 0;
1193 }
1194
1195 static int fastrpc_device_open(struct inode *inode, struct file *filp)
1196 {
1197 struct fastrpc_channel_ctx *cctx = miscdev_to_cctx(filp->private_data);
1198 struct fastrpc_user *fl = NULL;
1199 unsigned long flags;
1200
1201 fl = kzalloc(sizeof(*fl), GFP_KERNEL);
1202 if (!fl)
1203 return -ENOMEM;
1204
1205 /* Released in fastrpc_device_release() */
1206 fastrpc_channel_ctx_get(cctx);
1207
1208 filp->private_data = fl;
1209 spin_lock_init(&fl->lock);
1210 mutex_init(&fl->mutex);
1211 INIT_LIST_HEAD(&fl->pending);
1212 INIT_LIST_HEAD(&fl->maps);
1213 INIT_LIST_HEAD(&fl->mmaps);
1214 INIT_LIST_HEAD(&fl->user);
1215 fl->tgid = current->tgid;
1216 fl->cctx = cctx;
1217
1218 fl->sctx = fastrpc_session_alloc(cctx);
1219 if (!fl->sctx) {
1220 dev_err(&cctx->rpdev->dev, "No session available\n");
1221 mutex_destroy(&fl->mutex);
1222 kfree(fl);
1223
1224 return -EBUSY;
1225 }
1226
1227 spin_lock_irqsave(&cctx->lock, flags);
1228 list_add_tail(&fl->user, &cctx->users);
1229 spin_unlock_irqrestore(&cctx->lock, flags);
1230
1231 return 0;
1232 }
1233
1234 static int fastrpc_dmabuf_alloc(struct fastrpc_user *fl, char __user *argp)
1235 {
1236 struct fastrpc_alloc_dma_buf bp;
1237 DEFINE_DMA_BUF_EXPORT_INFO(exp_info);
1238 struct fastrpc_buf *buf = NULL;
1239 int err;
1240
1241 if (copy_from_user(&bp, argp, sizeof(bp)))
1242 return -EFAULT;
1243
1244 err = fastrpc_buf_alloc(fl, fl->sctx->dev, bp.size, &buf);
1245 if (err)
1246 return err;
1247 exp_info.ops = &fastrpc_dma_buf_ops;
1248 exp_info.size = bp.size;
1249 exp_info.flags = O_RDWR;
1250 exp_info.priv = buf;
1251 buf->dmabuf = dma_buf_export(&exp_info);
1252 if (IS_ERR(buf->dmabuf)) {
1253 err = PTR_ERR(buf->dmabuf);
1254 fastrpc_buf_free(buf);
1255 return err;
1256 }
1257
1258 bp.fd = dma_buf_fd(buf->dmabuf, O_ACCMODE);
1259 if (bp.fd < 0) {
1260 dma_buf_put(buf->dmabuf);
1261 return -EINVAL;
1262 }
1263
1264 if (copy_to_user(argp, &bp, sizeof(bp))) {
1265 dma_buf_put(buf->dmabuf);
1266 return -EFAULT;
1267 }
1268
1269 return 0;
1270 }
1271
1272 static int fastrpc_init_attach(struct fastrpc_user *fl)
1273 {
1274 struct fastrpc_invoke_args args[1];
1275 int tgid = fl->tgid;
1276 u32 sc;
1277
1278 args[0].ptr = (u64)(uintptr_t) &tgid;
1279 args[0].length = sizeof(tgid);
1280 args[0].fd = -1;
1281 args[0].reserved = 0;
1282 sc = FASTRPC_SCALARS(FASTRPC_RMID_INIT_ATTACH, 1, 0);
1283 fl->pd = 0;
1284
1285 return fastrpc_internal_invoke(fl, true, FASTRPC_INIT_HANDLE,
1286 sc, &args[0]);
1287 }
1288
1289 static int fastrpc_invoke(struct fastrpc_user *fl, char __user *argp)
1290 {
1291 struct fastrpc_invoke_args *args = NULL;
1292 struct fastrpc_invoke inv;
1293 u32 nscalars;
1294 int err;
1295
1296 if (copy_from_user(&inv, argp, sizeof(inv)))
1297 return -EFAULT;
1298
1299 /* nscalars is truncated here to max supported value */
1300 nscalars = REMOTE_SCALARS_LENGTH(inv.sc);
1301 if (nscalars) {
1302 args = kcalloc(nscalars, sizeof(*args), GFP_KERNEL);
1303 if (!args)
1304 return -ENOMEM;
1305
1306 if (copy_from_user(args, (void __user *)(uintptr_t)inv.args,
1307 nscalars * sizeof(*args))) {
1308 kfree(args);
1309 return -EFAULT;
1310 }
1311 }
1312
1313 err = fastrpc_internal_invoke(fl, false, inv.handle, inv.sc, args);
1314 kfree(args);
1315
1316 return err;
1317 }
1318
1319 static int fastrpc_req_munmap_impl(struct fastrpc_user *fl,
1320 struct fastrpc_req_munmap *req)
1321 {
1322 struct fastrpc_invoke_args args[1] = { [0] = { 0 } };
1323 struct fastrpc_buf *buf, *b;
1324 struct fastrpc_munmap_req_msg req_msg;
1325 struct device *dev = fl->sctx->dev;
1326 int err;
1327 u32 sc;
1328
1329 spin_lock(&fl->lock);
1330 list_for_each_entry_safe(buf, b, &fl->mmaps, node) {
1331 if ((buf->raddr == req->vaddrout) && (buf->size == req->size))
1332 break;
1333 buf = NULL;
1334 }
1335 spin_unlock(&fl->lock);
1336
1337 if (!buf) {
1338 dev_err(dev, "mmap not in list\n");
1339 return -EINVAL;
1340 }
1341
1342 req_msg.pgid = fl->tgid;
1343 req_msg.size = buf->size;
1344 req_msg.vaddr = buf->raddr;
1345
1346 args[0].ptr = (u64) (uintptr_t) &req_msg;
1347 args[0].length = sizeof(req_msg);
1348
1349 sc = FASTRPC_SCALARS(FASTRPC_RMID_INIT_MUNMAP, 1, 0);
1350 err = fastrpc_internal_invoke(fl, true, FASTRPC_INIT_HANDLE, sc,
1351 &args[0]);
1352 if (!err) {
1353 dev_dbg(dev, "unmmap\tpt 0x%09lx OK\n", buf->raddr);
1354 spin_lock(&fl->lock);
1355 list_del(&buf->node);
1356 spin_unlock(&fl->lock);
1357 fastrpc_buf_free(buf);
1358 } else {
1359 dev_err(dev, "unmmap\tpt 0x%09lx ERROR\n", buf->raddr);
1360 }
1361
1362 return err;
1363 }
1364
1365 static int fastrpc_req_munmap(struct fastrpc_user *fl, char __user *argp)
1366 {
1367 struct fastrpc_req_munmap req;
1368
1369 if (copy_from_user(&req, argp, sizeof(req)))
1370 return -EFAULT;
1371
1372 return fastrpc_req_munmap_impl(fl, &req);
1373 }
1374
1375 static int fastrpc_req_mmap(struct fastrpc_user *fl, char __user *argp)
1376 {
1377 struct fastrpc_invoke_args args[3] = { [0 ... 2] = { 0 } };
1378 struct fastrpc_buf *buf = NULL;
1379 struct fastrpc_mmap_req_msg req_msg;
1380 struct fastrpc_mmap_rsp_msg rsp_msg;
1381 struct fastrpc_req_munmap req_unmap;
1382 struct fastrpc_phy_page pages;
1383 struct fastrpc_req_mmap req;
1384 struct device *dev = fl->sctx->dev;
1385 int err;
1386 u32 sc;
1387
1388 if (copy_from_user(&req, argp, sizeof(req)))
1389 return -EFAULT;
1390
1391 if (req.flags != ADSP_MMAP_ADD_PAGES) {
1392 dev_err(dev, "flag not supported 0x%x\n", req.flags);
1393 return -EINVAL;
1394 }
1395
1396 if (req.vaddrin) {
1397 dev_err(dev, "adding user allocated pages is not supported\n");
1398 return -EINVAL;
1399 }
1400
1401 err = fastrpc_buf_alloc(fl, fl->sctx->dev, req.size, &buf);
1402 if (err) {
1403 dev_err(dev, "failed to allocate buffer\n");
1404 return err;
1405 }
1406
1407 req_msg.pgid = fl->tgid;
1408 req_msg.flags = req.flags;
1409 req_msg.vaddr = req.vaddrin;
1410 req_msg.num = sizeof(pages);
1411
1412 args[0].ptr = (u64) (uintptr_t) &req_msg;
1413 args[0].length = sizeof(req_msg);
1414
1415 pages.addr = buf->phys;
1416 pages.size = buf->size;
1417
1418 args[1].ptr = (u64) (uintptr_t) &pages;
1419 args[1].length = sizeof(pages);
1420
1421 args[2].ptr = (u64) (uintptr_t) &rsp_msg;
1422 args[2].length = sizeof(rsp_msg);
1423
1424 sc = FASTRPC_SCALARS(FASTRPC_RMID_INIT_MMAP, 2, 1);
1425 err = fastrpc_internal_invoke(fl, true, FASTRPC_INIT_HANDLE, sc,
1426 &args[0]);
1427 if (err) {
1428 dev_err(dev, "mmap error (len 0x%08llx)\n", buf->size);
1429 goto err_invoke;
1430 }
1431
1432 /* update the buffer to be able to deallocate the memory on the DSP */
1433 buf->raddr = (uintptr_t) rsp_msg.vaddr;
1434
1435 /* let the client know the address to use */
1436 req.vaddrout = rsp_msg.vaddr;
1437
1438 spin_lock(&fl->lock);
1439 list_add_tail(&buf->node, &fl->mmaps);
1440 spin_unlock(&fl->lock);
1441
1442 if (copy_to_user((void __user *)argp, &req, sizeof(req))) {
1443 /* unmap the memory and release the buffer */
1444 req_unmap.vaddrout = buf->raddr;
1445 req_unmap.size = buf->size;
1446 fastrpc_req_munmap_impl(fl, &req_unmap);
1447 return -EFAULT;
1448 }
1449
1450 dev_dbg(dev, "mmap\t\tpt 0x%09lx OK [len 0x%08llx]\n",
1451 buf->raddr, buf->size);
1452
1453 return 0;
1454
1455 err_invoke:
1456 fastrpc_buf_free(buf);
1457
1458 return err;
1459 }
1460
1461 static long fastrpc_device_ioctl(struct file *file, unsigned int cmd,
1462 unsigned long arg)
1463 {
1464 struct fastrpc_user *fl = (struct fastrpc_user *)file->private_data;
1465 char __user *argp = (char __user *)arg;
1466 int err;
1467
1468 switch (cmd) {
1469 case FASTRPC_IOCTL_INVOKE:
1470 err = fastrpc_invoke(fl, argp);
1471 break;
1472 case FASTRPC_IOCTL_INIT_ATTACH:
1473 err = fastrpc_init_attach(fl);
1474 break;
1475 case FASTRPC_IOCTL_INIT_CREATE:
1476 err = fastrpc_init_create_process(fl, argp);
1477 break;
1478 case FASTRPC_IOCTL_ALLOC_DMA_BUFF:
1479 err = fastrpc_dmabuf_alloc(fl, argp);
1480 break;
1481 case FASTRPC_IOCTL_MMAP:
1482 err = fastrpc_req_mmap(fl, argp);
1483 break;
1484 case FASTRPC_IOCTL_MUNMAP:
1485 err = fastrpc_req_munmap(fl, argp);
1486 break;
1487 default:
1488 err = -ENOTTY;
1489 break;
1490 }
1491
1492 return err;
1493 }
1494
1495 static const struct file_operations fastrpc_fops = {
1496 .open = fastrpc_device_open,
1497 .release = fastrpc_device_release,
1498 .unlocked_ioctl = fastrpc_device_ioctl,
1499 .compat_ioctl = fastrpc_device_ioctl,
1500 };
1501
1502 static int fastrpc_cb_probe(struct platform_device *pdev)
1503 {
1504 struct fastrpc_channel_ctx *cctx;
1505 struct fastrpc_session_ctx *sess;
1506 struct device *dev = &pdev->dev;
1507 int i, sessions = 0;
1508 unsigned long flags;
1509 int rc;
1510
1511 cctx = dev_get_drvdata(dev->parent);
1512 if (!cctx)
1513 return -EINVAL;
1514
1515 of_property_read_u32(dev->of_node, "qcom,nsessions", &sessions);
1516
1517 spin_lock_irqsave(&cctx->lock, flags);
1518 sess = &cctx->session[cctx->sesscount];
1519 sess->used = false;
1520 sess->valid = true;
1521 sess->dev = dev;
1522 dev_set_drvdata(dev, sess);
1523
1524 if (of_property_read_u32(dev->of_node, "reg", &sess->sid))
1525 dev_info(dev, "FastRPC Session ID not specified in DT\n");
1526
1527 if (sessions > 0) {
1528 struct fastrpc_session_ctx *dup_sess;
1529
1530 for (i = 1; i < sessions; i++) {
1531 if (cctx->sesscount++ >= FASTRPC_MAX_SESSIONS)
1532 break;
1533 dup_sess = &cctx->session[cctx->sesscount];
1534 memcpy(dup_sess, sess, sizeof(*dup_sess));
1535 }
1536 }
1537 cctx->sesscount++;
1538 spin_unlock_irqrestore(&cctx->lock, flags);
1539 rc = dma_set_mask(dev, DMA_BIT_MASK(32));
1540 if (rc) {
1541 dev_err(dev, "32-bit DMA enable failed\n");
1542 return rc;
1543 }
1544
1545 return 0;
1546 }
1547
1548 static int fastrpc_cb_remove(struct platform_device *pdev)
1549 {
1550 struct fastrpc_channel_ctx *cctx = dev_get_drvdata(pdev->dev.parent);
1551 struct fastrpc_session_ctx *sess = dev_get_drvdata(&pdev->dev);
1552 unsigned long flags;
1553 int i;
1554
1555 spin_lock_irqsave(&cctx->lock, flags);
1556 for (i = 1; i < FASTRPC_MAX_SESSIONS; i++) {
1557 if (cctx->session[i].sid == sess->sid) {
1558 cctx->session[i].valid = false;
1559 cctx->sesscount--;
1560 }
1561 }
1562 spin_unlock_irqrestore(&cctx->lock, flags);
1563
1564 return 0;
1565 }
1566
1567 static const struct of_device_id fastrpc_match_table[] = {
1568 { .compatible = "qcom,fastrpc-compute-cb", },
1569 {}
1570 };
1571
1572 static struct platform_driver fastrpc_cb_driver = {
1573 .probe = fastrpc_cb_probe,
1574 .remove = fastrpc_cb_remove,
1575 .driver = {
1576 .name = "qcom,fastrpc-cb",
1577 .of_match_table = fastrpc_match_table,
1578 .suppress_bind_attrs = true,
1579 },
1580 };
1581
1582 static int fastrpc_rpmsg_probe(struct rpmsg_device *rpdev)
1583 {
1584 struct device *rdev = &rpdev->dev;
1585 struct fastrpc_channel_ctx *data;
1586 int i, err, domain_id = -1;
1587 const char *domain;
1588
1589 err = of_property_read_string(rdev->of_node, "label", &domain);
1590 if (err) {
1591 dev_info(rdev, "FastRPC Domain not specified in DT\n");
1592 return err;
1593 }
1594
1595 for (i = 0; i <= CDSP_DOMAIN_ID; i++) {
1596 if (!strcmp(domains[i], domain)) {
1597 domain_id = i;
1598 break;
1599 }
1600 }
1601
1602 if (domain_id < 0) {
1603 dev_info(rdev, "FastRPC Invalid Domain ID %d\n", domain_id);
1604 return -EINVAL;
1605 }
1606
1607 data = kzalloc(sizeof(*data), GFP_KERNEL);
1608 if (!data)
1609 return -ENOMEM;
1610
1611 data->miscdev.minor = MISC_DYNAMIC_MINOR;
1612 data->miscdev.name = devm_kasprintf(rdev, GFP_KERNEL, "fastrpc-%s",
1613 domains[domain_id]);
1614 data->miscdev.fops = &fastrpc_fops;
1615 err = misc_register(&data->miscdev);
1616 if (err)
1617 return err;
1618
1619 kref_init(&data->refcount);
1620
1621 dev_set_drvdata(&rpdev->dev, data);
1622 dma_set_mask_and_coherent(rdev, DMA_BIT_MASK(32));
1623 INIT_LIST_HEAD(&data->users);
1624 spin_lock_init(&data->lock);
1625 idr_init(&data->ctx_idr);
1626 data->domain_id = domain_id;
1627 data->rpdev = rpdev;
1628
1629 return of_platform_populate(rdev->of_node, NULL, NULL, rdev);
1630 }
1631
1632 static void fastrpc_notify_users(struct fastrpc_user *user)
1633 {
1634 struct fastrpc_invoke_ctx *ctx;
1635
1636 spin_lock(&user->lock);
1637 list_for_each_entry(ctx, &user->pending, node)
1638 complete(&ctx->work);
1639 spin_unlock(&user->lock);
1640 }
1641
1642 static void fastrpc_rpmsg_remove(struct rpmsg_device *rpdev)
1643 {
1644 struct fastrpc_channel_ctx *cctx = dev_get_drvdata(&rpdev->dev);
1645 struct fastrpc_user *user;
1646 unsigned long flags;
1647
1648 spin_lock_irqsave(&cctx->lock, flags);
1649 list_for_each_entry(user, &cctx->users, user)
1650 fastrpc_notify_users(user);
1651 spin_unlock_irqrestore(&cctx->lock, flags);
1652
1653 misc_deregister(&cctx->miscdev);
1654 of_platform_depopulate(&rpdev->dev);
1655
1656 cctx->rpdev = NULL;
1657 fastrpc_channel_ctx_put(cctx);
1658 }
1659
1660 static int fastrpc_rpmsg_callback(struct rpmsg_device *rpdev, void *data,
1661 int len, void *priv, u32 addr)
1662 {
1663 struct fastrpc_channel_ctx *cctx = dev_get_drvdata(&rpdev->dev);
1664 struct fastrpc_invoke_rsp *rsp = data;
1665 struct fastrpc_invoke_ctx *ctx;
1666 unsigned long flags;
1667 unsigned long ctxid;
1668
1669 if (len < sizeof(*rsp))
1670 return -EINVAL;
1671
1672 ctxid = ((rsp->ctx & FASTRPC_CTXID_MASK) >> 4);
1673
1674 spin_lock_irqsave(&cctx->lock, flags);
1675 ctx = idr_find(&cctx->ctx_idr, ctxid);
1676 spin_unlock_irqrestore(&cctx->lock, flags);
1677
1678 if (!ctx) {
1679 dev_err(&rpdev->dev, "No context ID matches response\n");
1680 return -ENOENT;
1681 }
1682
1683 ctx->retval = rsp->retval;
1684 complete(&ctx->work);
1685
1686 /*
1687 * The DMA buffer associated with the context cannot be freed in
1688 * interrupt context so schedule it through a worker thread to
1689 * avoid a kernel BUG.
1690 */
1691 schedule_work(&ctx->put_work);
1692
1693 return 0;
1694 }
1695
1696 static const struct of_device_id fastrpc_rpmsg_of_match[] = {
1697 { .compatible = "qcom,fastrpc" },
1698 { },
1699 };
1700 MODULE_DEVICE_TABLE(of, fastrpc_rpmsg_of_match);
1701
1702 static struct rpmsg_driver fastrpc_driver = {
1703 .probe = fastrpc_rpmsg_probe,
1704 .remove = fastrpc_rpmsg_remove,
1705 .callback = fastrpc_rpmsg_callback,
1706 .drv = {
1707 .name = "qcom,fastrpc",
1708 .of_match_table = fastrpc_rpmsg_of_match,
1709 },
1710 };
1711
1712 static int fastrpc_init(void)
1713 {
1714 int ret;
1715
1716 ret = platform_driver_register(&fastrpc_cb_driver);
1717 if (ret < 0) {
1718 pr_err("fastrpc: failed to register cb driver\n");
1719 return ret;
1720 }
1721
1722 ret = register_rpmsg_driver(&fastrpc_driver);
1723 if (ret < 0) {
1724 pr_err("fastrpc: failed to register rpmsg driver\n");
1725 platform_driver_unregister(&fastrpc_cb_driver);
1726 return ret;
1727 }
1728
1729 return 0;
1730 }
1731 module_init(fastrpc_init);
1732
1733 static void fastrpc_exit(void)
1734 {
1735 platform_driver_unregister(&fastrpc_cb_driver);
1736 unregister_rpmsg_driver(&fastrpc_driver);
1737 }
1738 module_exit(fastrpc_exit);
1739
1740 MODULE_LICENSE("GPL v2");
Linux with added FPC-III support