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Merge tag 'block-5.11-2021-01-10' of git://git.kernel.dk/linux-block
[linux/fpc-iii.git] / drivers / misc / fastrpc.c
blob70eb5ed942d036c71006a2187fdff08152eb9623
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
83 static const char *domains[FASTRPC_DEV_MAX] = { "adsp", "mdsp",
84 "sdsp", "cdsp"};
85 struct fastrpc_phy_page {
86 u64 addr; /* physical address */
87 u64 size; /* size of contiguous region */
88 };
89
90 struct fastrpc_invoke_buf {
91 u32 num; /* number of contiguous regions */
92 u32 pgidx; /* index to start of contiguous region */
93 };
94
95 struct fastrpc_remote_arg {
96 u64 pv;
97 u64 len;
98 };
99
100 struct fastrpc_mmap_rsp_msg {
101 u64 vaddr;
102 };
103
104 struct fastrpc_mmap_req_msg {
105 s32 pgid;
106 u32 flags;
107 u64 vaddr;
108 s32 num;
109 };
110
111 struct fastrpc_munmap_req_msg {
112 s32 pgid;
113 u64 vaddr;
114 u64 size;
115 };
116
117 struct 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
127 struct fastrpc_invoke_rsp {
128 u64 ctx; /* invoke caller context */
129 int retval; /* invoke return value */
130 };
131
132 struct fastrpc_buf_overlap {
133 u64 start;
134 u64 end;
135 int raix;
136 u64 mstart;
137 u64 mend;
138 u64 offset;
139 };
140
141 struct 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
156 struct fastrpc_dma_buf_attachment {
157 struct device *dev;
158 struct sg_table sgt;
159 struct list_head node;
160 };
161
162 struct 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
176 struct 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
200 struct fastrpc_session_ctx {
201 struct device *dev;
202 int sid;
203 bool used;
204 bool valid;
205 };
206
207 struct 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
219 struct 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
237 static 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
253 static void fastrpc_map_put(struct fastrpc_map *map)
254 {
255 if (map)
256 kref_put(&map->refcount, fastrpc_free_map);
257 }
258
259 static void fastrpc_map_get(struct fastrpc_map *map)
260 {
261 if (map)
262 kref_get(&map->refcount);
263 }
264
265 static 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
284 static 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
291 static 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
327 static 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
336 static void fastrpc_channel_ctx_get(struct fastrpc_channel_ctx *cctx)
337 {
338 kref_get(&cctx->refcount);
339 }
340
341 static void fastrpc_channel_ctx_put(struct fastrpc_channel_ctx *cctx)
342 {
343 kref_put(&cctx->refcount, fastrpc_channel_ctx_free);
344 }
345
346 static 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
373 static void fastrpc_context_get(struct fastrpc_invoke_ctx *ctx)
374 {
375 kref_get(&ctx->refcount);
376 }
377
378 static void fastrpc_context_put(struct fastrpc_invoke_ctx *ctx)
379 {
380 kref_put(&ctx->refcount, fastrpc_context_free);
381 }
382
383 static 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)
392 static 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
404 static 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
440 static 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;
505 err_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
517 static struct sg_table *
518 fastrpc_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
524 table = &a->sgt;
525
526 if (!dma_map_sgtable(attachment->dev, table, dir, 0))
527 return ERR_PTR(-ENOMEM);
528
529 return table;
530 }
531
532 static void fastrpc_unmap_dma_buf(struct dma_buf_attachment *attach,
533 struct sg_table *table,
534 enum dma_data_direction dir)
535 {
536 dma_unmap_sgtable(attach->dev, table, dir, 0);
537 }
538
539 static void fastrpc_release(struct dma_buf *dmabuf)
540 {
541 struct fastrpc_buf *buffer = dmabuf->priv;
542
543 fastrpc_buf_free(buffer);
544 }
545
546 static int fastrpc_dma_buf_attach(struct dma_buf *dmabuf,
547 struct dma_buf_attachment *attachment)
548 {
549 struct fastrpc_dma_buf_attachment *a;
550 struct fastrpc_buf *buffer = dmabuf->priv;
551 int ret;
552
553 a = kzalloc(sizeof(*a), GFP_KERNEL);
554 if (!a)
555 return -ENOMEM;
556
557 ret = dma_get_sgtable(buffer->dev, &a->sgt, buffer->virt,
558 FASTRPC_PHYS(buffer->phys), buffer->size);
559 if (ret < 0) {
560 dev_err(buffer->dev, "failed to get scatterlist from DMA API\n");
561 kfree(a);
562 return -EINVAL;
563 }
564
565 a->dev = attachment->dev;
566 INIT_LIST_HEAD(&a->node);
567 attachment->priv = a;
568
569 mutex_lock(&buffer->lock);
570 list_add(&a->node, &buffer->attachments);
571 mutex_unlock(&buffer->lock);
572
573 return 0;
574 }
575
576 static void fastrpc_dma_buf_detatch(struct dma_buf *dmabuf,
577 struct dma_buf_attachment *attachment)
578 {
579 struct fastrpc_dma_buf_attachment *a = attachment->priv;
580 struct fastrpc_buf *buffer = dmabuf->priv;
581
582 mutex_lock(&buffer->lock);
583 list_del(&a->node);
584 mutex_unlock(&buffer->lock);
585 sg_free_table(&a->sgt);
586 kfree(a);
587 }
588
589 static int fastrpc_vmap(struct dma_buf *dmabuf, struct dma_buf_map *map)
590 {
591 struct fastrpc_buf *buf = dmabuf->priv;
592
593 dma_buf_map_set_vaddr(map, buf->virt);
594
595 return 0;
596 }
597
598 static int fastrpc_mmap(struct dma_buf *dmabuf,
599 struct vm_area_struct *vma)
600 {
601 struct fastrpc_buf *buf = dmabuf->priv;
602 size_t size = vma->vm_end - vma->vm_start;
603
604 return dma_mmap_coherent(buf->dev, vma, buf->virt,
605 FASTRPC_PHYS(buf->phys), size);
606 }
607
608 static const struct dma_buf_ops fastrpc_dma_buf_ops = {
609 .attach = fastrpc_dma_buf_attach,
610 .detach = fastrpc_dma_buf_detatch,
611 .map_dma_buf = fastrpc_map_dma_buf,
612 .unmap_dma_buf = fastrpc_unmap_dma_buf,
613 .mmap = fastrpc_mmap,
614 .vmap = fastrpc_vmap,
615 .release = fastrpc_release,
616 };
617
618 static int fastrpc_map_create(struct fastrpc_user *fl, int fd,
619 u64 len, struct fastrpc_map **ppmap)
620 {
621 struct fastrpc_session_ctx *sess = fl->sctx;
622 struct fastrpc_map *map = NULL;
623 int err = 0;
624
625 if (!fastrpc_map_find(fl, fd, ppmap))
626 return 0;
627
628 map = kzalloc(sizeof(*map), GFP_KERNEL);
629 if (!map)
630 return -ENOMEM;
631
632 INIT_LIST_HEAD(&map->node);
633 map->fl = fl;
634 map->fd = fd;
635 map->buf = dma_buf_get(fd);
636 if (IS_ERR(map->buf)) {
637 err = PTR_ERR(map->buf);
638 goto get_err;
639 }
640
641 map->attach = dma_buf_attach(map->buf, sess->dev);
642 if (IS_ERR(map->attach)) {
643 dev_err(sess->dev, "Failed to attach dmabuf\n");
644 err = PTR_ERR(map->attach);
645 goto attach_err;
646 }
647
648 map->table = dma_buf_map_attachment(map->attach, DMA_BIDIRECTIONAL);
649 if (IS_ERR(map->table)) {
650 err = PTR_ERR(map->table);
651 goto map_err;
652 }
653
654 map->phys = sg_dma_address(map->table->sgl);
655 map->phys += ((u64)fl->sctx->sid << 32);
656 map->size = len;
657 map->va = sg_virt(map->table->sgl);
658 map->len = len;
659 kref_init(&map->refcount);
660
661 spin_lock(&fl->lock);
662 list_add_tail(&map->node, &fl->maps);
663 spin_unlock(&fl->lock);
664 *ppmap = map;
665
666 return 0;
667
668 map_err:
669 dma_buf_detach(map->buf, map->attach);
670 attach_err:
671 dma_buf_put(map->buf);
672 get_err:
673 kfree(map);
674
675 return err;
676 }
677
678 /*
679 * Fastrpc payload buffer with metadata looks like:
680 *
681 * >>>>>> START of METADATA <<<<<<<<<
682 * +---------------------------------+
683 * | Arguments |
684 * | type:(struct fastrpc_remote_arg)|
685 * | (0 - N) |
686 * +---------------------------------+
687 * | Invoke Buffer list |
688 * | type:(struct fastrpc_invoke_buf)|
689 * | (0 - N) |
690 * +---------------------------------+
691 * | Page info list |
692 * | type:(struct fastrpc_phy_page) |
693 * | (0 - N) |
694 * +---------------------------------+
695 * | Optional info |
696 * |(can be specific to SoC/Firmware)|
697 * +---------------------------------+
698 * >>>>>>>> END of METADATA <<<<<<<<<
699 * +---------------------------------+
700 * | Inline ARGS |
701 * | (0-N) |
702 * +---------------------------------+
703 */
704
705 static int fastrpc_get_meta_size(struct fastrpc_invoke_ctx *ctx)
706 {
707 int size = 0;
708
709 size = (sizeof(struct fastrpc_remote_arg) +
710 sizeof(struct fastrpc_invoke_buf) +
711 sizeof(struct fastrpc_phy_page)) * ctx->nscalars +
712 sizeof(u64) * FASTRPC_MAX_FDLIST +
713 sizeof(u32) * FASTRPC_MAX_CRCLIST;
714
715 return size;
716 }
717
718 static u64 fastrpc_get_payload_size(struct fastrpc_invoke_ctx *ctx, int metalen)
719 {
720 u64 size = 0;
721 int i;
722
723 size = ALIGN(metalen, FASTRPC_ALIGN);
724 for (i = 0; i < ctx->nscalars; i++) {
725 if (ctx->args[i].fd == 0 || ctx->args[i].fd == -1) {
726
727 if (ctx->olaps[i].offset == 0)
728 size = ALIGN(size, FASTRPC_ALIGN);
729
730 size += (ctx->olaps[i].mend - ctx->olaps[i].mstart);
731 }
732 }
733
734 return size;
735 }
736
737 static int fastrpc_create_maps(struct fastrpc_invoke_ctx *ctx)
738 {
739 struct device *dev = ctx->fl->sctx->dev;
740 int i, err;
741
742 for (i = 0; i < ctx->nscalars; ++i) {
743 /* Make sure reserved field is set to 0 */
744 if (ctx->args[i].reserved)
745 return -EINVAL;
746
747 if (ctx->args[i].fd == 0 || ctx->args[i].fd == -1 ||
748 ctx->args[i].length == 0)
749 continue;
750
751 err = fastrpc_map_create(ctx->fl, ctx->args[i].fd,
752 ctx->args[i].length, &ctx->maps[i]);
753 if (err) {
754 dev_err(dev, "Error Creating map %d\n", err);
755 return -EINVAL;
756 }
757
758 }
759 return 0;
760 }
761
762 static int fastrpc_get_args(u32 kernel, struct fastrpc_invoke_ctx *ctx)
763 {
764 struct device *dev = ctx->fl->sctx->dev;
765 struct fastrpc_remote_arg *rpra;
766 struct fastrpc_invoke_buf *list;
767 struct fastrpc_phy_page *pages;
768 int inbufs, i, oix, err = 0;
769 u64 len, rlen, pkt_size;
770 u64 pg_start, pg_end;
771 uintptr_t args;
772 int metalen;
773
774 inbufs = REMOTE_SCALARS_INBUFS(ctx->sc);
775 metalen = fastrpc_get_meta_size(ctx);
776 pkt_size = fastrpc_get_payload_size(ctx, metalen);
777
778 err = fastrpc_create_maps(ctx);
779 if (err)
780 return err;
781
782 ctx->msg_sz = pkt_size;
783
784 err = fastrpc_buf_alloc(ctx->fl, dev, pkt_size, &ctx->buf);
785 if (err)
786 return err;
787
788 rpra = ctx->buf->virt;
789 list = ctx->buf->virt + ctx->nscalars * sizeof(*rpra);
790 pages = ctx->buf->virt + ctx->nscalars * (sizeof(*list) +
791 sizeof(*rpra));
792 args = (uintptr_t)ctx->buf->virt + metalen;
793 rlen = pkt_size - metalen;
794 ctx->rpra = rpra;
795
796 for (oix = 0; oix < ctx->nbufs; ++oix) {
797 int mlen;
798
799 i = ctx->olaps[oix].raix;
800 len = ctx->args[i].length;
801
802 rpra[i].pv = 0;
803 rpra[i].len = len;
804 list[i].num = len ? 1 : 0;
805 list[i].pgidx = i;
806
807 if (!len)
808 continue;
809
810 if (ctx->maps[i]) {
811 struct vm_area_struct *vma = NULL;
812
813 rpra[i].pv = (u64) ctx->args[i].ptr;
814 pages[i].addr = ctx->maps[i]->phys;
815
816 vma = find_vma(current->mm, ctx->args[i].ptr);
817 if (vma)
818 pages[i].addr += ctx->args[i].ptr -
819 vma->vm_start;
820
821 pg_start = (ctx->args[i].ptr & PAGE_MASK) >> PAGE_SHIFT;
822 pg_end = ((ctx->args[i].ptr + len - 1) & PAGE_MASK) >>
823 PAGE_SHIFT;
824 pages[i].size = (pg_end - pg_start + 1) * PAGE_SIZE;
825
826 } else {
827
828 if (ctx->olaps[oix].offset == 0) {
829 rlen -= ALIGN(args, FASTRPC_ALIGN) - args;
830 args = ALIGN(args, FASTRPC_ALIGN);
831 }
832
833 mlen = ctx->olaps[oix].mend - ctx->olaps[oix].mstart;
834
835 if (rlen < mlen)
836 goto bail;
837
838 rpra[i].pv = args - ctx->olaps[oix].offset;
839 pages[i].addr = ctx->buf->phys -
840 ctx->olaps[oix].offset +
841 (pkt_size - rlen);
842 pages[i].addr = pages[i].addr & PAGE_MASK;
843
844 pg_start = (args & PAGE_MASK) >> PAGE_SHIFT;
845 pg_end = ((args + len - 1) & PAGE_MASK) >> PAGE_SHIFT;
846 pages[i].size = (pg_end - pg_start + 1) * PAGE_SIZE;
847 args = args + mlen;
848 rlen -= mlen;
849 }
850
851 if (i < inbufs && !ctx->maps[i]) {
852 void *dst = (void *)(uintptr_t)rpra[i].pv;
853 void *src = (void *)(uintptr_t)ctx->args[i].ptr;
854
855 if (!kernel) {
856 if (copy_from_user(dst, (void __user *)src,
857 len)) {
858 err = -EFAULT;
859 goto bail;
860 }
861 } else {
862 memcpy(dst, src, len);
863 }
864 }
865 }
866
867 for (i = ctx->nbufs; i < ctx->nscalars; ++i) {
868 rpra[i].pv = (u64) ctx->args[i].ptr;
869 rpra[i].len = ctx->args[i].length;
870 list[i].num = ctx->args[i].length ? 1 : 0;
871 list[i].pgidx = i;
872 pages[i].addr = ctx->maps[i]->phys;
873 pages[i].size = ctx->maps[i]->size;
874 }
875
876 bail:
877 if (err)
878 dev_err(dev, "Error: get invoke args failed:%d\n", err);
879
880 return err;
881 }
882
883 static int fastrpc_put_args(struct fastrpc_invoke_ctx *ctx,
884 u32 kernel)
885 {
886 struct fastrpc_remote_arg *rpra = ctx->rpra;
887 int i, inbufs;
888
889 inbufs = REMOTE_SCALARS_INBUFS(ctx->sc);
890
891 for (i = inbufs; i < ctx->nbufs; ++i) {
892 void *src = (void *)(uintptr_t)rpra[i].pv;
893 void *dst = (void *)(uintptr_t)ctx->args[i].ptr;
894 u64 len = rpra[i].len;
895
896 if (!kernel) {
897 if (copy_to_user((void __user *)dst, src, len))
898 return -EFAULT;
899 } else {
900 memcpy(dst, src, len);
901 }
902 }
903
904 return 0;
905 }
906
907 static int fastrpc_invoke_send(struct fastrpc_session_ctx *sctx,
908 struct fastrpc_invoke_ctx *ctx,
909 u32 kernel, uint32_t handle)
910 {
911 struct fastrpc_channel_ctx *cctx;
912 struct fastrpc_user *fl = ctx->fl;
913 struct fastrpc_msg *msg = &ctx->msg;
914 int ret;
915
916 cctx = fl->cctx;
917 msg->pid = fl->tgid;
918 msg->tid = current->pid;
919
920 if (kernel)
921 msg->pid = 0;
922
923 msg->ctx = ctx->ctxid | fl->pd;
924 msg->handle = handle;
925 msg->sc = ctx->sc;
926 msg->addr = ctx->buf ? ctx->buf->phys : 0;
927 msg->size = roundup(ctx->msg_sz, PAGE_SIZE);
928 fastrpc_context_get(ctx);
929
930 ret = rpmsg_send(cctx->rpdev->ept, (void *)msg, sizeof(*msg));
931
932 if (ret)
933 fastrpc_context_put(ctx);
934
935 return ret;
936
937 }
938
939 static int fastrpc_internal_invoke(struct fastrpc_user *fl, u32 kernel,
940 u32 handle, u32 sc,
941 struct fastrpc_invoke_args *args)
942 {
943 struct fastrpc_invoke_ctx *ctx = NULL;
944 int err = 0;
945
946 if (!fl->sctx)
947 return -EINVAL;
948
949 if (!fl->cctx->rpdev)
950 return -EPIPE;
951
952 ctx = fastrpc_context_alloc(fl, kernel, sc, args);
953 if (IS_ERR(ctx))
954 return PTR_ERR(ctx);
955
956 if (ctx->nscalars) {
957 err = fastrpc_get_args(kernel, ctx);
958 if (err)
959 goto bail;
960 }
961
962 /* make sure that all CPU memory writes are seen by DSP */
963 dma_wmb();
964 /* Send invoke buffer to remote dsp */
965 err = fastrpc_invoke_send(fl->sctx, ctx, kernel, handle);
966 if (err)
967 goto bail;
968
969 if (kernel) {
970 if (!wait_for_completion_timeout(&ctx->work, 10 * HZ))
971 err = -ETIMEDOUT;
972 } else {
973 err = wait_for_completion_interruptible(&ctx->work);
974 }
975
976 if (err)
977 goto bail;
978
979 /* Check the response from remote dsp */
980 err = ctx->retval;
981 if (err)
982 goto bail;
983
984 if (ctx->nscalars) {
985 /* make sure that all memory writes by DSP are seen by CPU */
986 dma_rmb();
987 /* populate all the output buffers with results */
988 err = fastrpc_put_args(ctx, kernel);
989 if (err)
990 goto bail;
991 }
992
993 bail:
994 if (err != -ERESTARTSYS && err != -ETIMEDOUT) {
995 /* We are done with this compute context */
996 spin_lock(&fl->lock);
997 list_del(&ctx->node);
998 spin_unlock(&fl->lock);
999 fastrpc_context_put(ctx);
1000 }
1001 if (err)
1002 dev_dbg(fl->sctx->dev, "Error: Invoke Failed %d\n", err);
1003
1004 return err;
1005 }
1006
1007 static int fastrpc_init_create_process(struct fastrpc_user *fl,
1008 char __user *argp)
1009 {
1010 struct fastrpc_init_create init;
1011 struct fastrpc_invoke_args *args;
1012 struct fastrpc_phy_page pages[1];
1013 struct fastrpc_map *map = NULL;
1014 struct fastrpc_buf *imem = NULL;
1015 int memlen;
1016 int err;
1017 struct {
1018 int pgid;
1019 u32 namelen;
1020 u32 filelen;
1021 u32 pageslen;
1022 u32 attrs;
1023 u32 siglen;
1024 } inbuf;
1025 u32 sc;
1026
1027 args = kcalloc(FASTRPC_CREATE_PROCESS_NARGS, sizeof(*args), GFP_KERNEL);
1028 if (!args)
1029 return -ENOMEM;
1030
1031 if (copy_from_user(&init, argp, sizeof(init))) {
1032 err = -EFAULT;
1033 goto err;
1034 }
1035
1036 if (init.filelen > INIT_FILELEN_MAX) {
1037 err = -EINVAL;
1038 goto err;
1039 }
1040
1041 inbuf.pgid = fl->tgid;
1042 inbuf.namelen = strlen(current->comm) + 1;
1043 inbuf.filelen = init.filelen;
1044 inbuf.pageslen = 1;
1045 inbuf.attrs = init.attrs;
1046 inbuf.siglen = init.siglen;
1047 fl->pd = USER_PD;
1048
1049 if (init.filelen && init.filefd) {
1050 err = fastrpc_map_create(fl, init.filefd, init.filelen, &map);
1051 if (err)
1052 goto err;
1053 }
1054
1055 memlen = ALIGN(max(INIT_FILELEN_MAX, (int)init.filelen * 4),
1056 1024 * 1024);
1057 err = fastrpc_buf_alloc(fl, fl->sctx->dev, memlen,
1058 &imem);
1059 if (err)
1060 goto err_alloc;
1061
1062 fl->init_mem = imem;
1063 args[0].ptr = (u64)(uintptr_t)&inbuf;
1064 args[0].length = sizeof(inbuf);
1065 args[0].fd = -1;
1066
1067 args[1].ptr = (u64)(uintptr_t)current->comm;
1068 args[1].length = inbuf.namelen;
1069 args[1].fd = -1;
1070
1071 args[2].ptr = (u64) init.file;
1072 args[2].length = inbuf.filelen;
1073 args[2].fd = init.filefd;
1074
1075 pages[0].addr = imem->phys;
1076 pages[0].size = imem->size;
1077
1078 args[3].ptr = (u64)(uintptr_t) pages;
1079 args[3].length = 1 * sizeof(*pages);
1080 args[3].fd = -1;
1081
1082 args[4].ptr = (u64)(uintptr_t)&inbuf.attrs;
1083 args[4].length = sizeof(inbuf.attrs);
1084 args[4].fd = -1;
1085
1086 args[5].ptr = (u64)(uintptr_t) &inbuf.siglen;
1087 args[5].length = sizeof(inbuf.siglen);
1088 args[5].fd = -1;
1089
1090 sc = FASTRPC_SCALARS(FASTRPC_RMID_INIT_CREATE, 4, 0);
1091 if (init.attrs)
1092 sc = FASTRPC_SCALARS(FASTRPC_RMID_INIT_CREATE_ATTR, 6, 0);
1093
1094 err = fastrpc_internal_invoke(fl, true, FASTRPC_INIT_HANDLE,
1095 sc, args);
1096 if (err)
1097 goto err_invoke;
1098
1099 kfree(args);
1100
1101 return 0;
1102
1103 err_invoke:
1104 fl->init_mem = NULL;
1105 fastrpc_buf_free(imem);
1106 err_alloc:
1107 if (map) {
1108 spin_lock(&fl->lock);
1109 list_del(&map->node);
1110 spin_unlock(&fl->lock);
1111 fastrpc_map_put(map);
1112 }
1113 err:
1114 kfree(args);
1115
1116 return err;
1117 }
1118
1119 static struct fastrpc_session_ctx *fastrpc_session_alloc(
1120 struct fastrpc_channel_ctx *cctx)
1121 {
1122 struct fastrpc_session_ctx *session = NULL;
1123 unsigned long flags;
1124 int i;
1125
1126 spin_lock_irqsave(&cctx->lock, flags);
1127 for (i = 0; i < cctx->sesscount; i++) {
1128 if (!cctx->session[i].used && cctx->session[i].valid) {
1129 cctx->session[i].used = true;
1130 session = &cctx->session[i];
1131 break;
1132 }
1133 }
1134 spin_unlock_irqrestore(&cctx->lock, flags);
1135
1136 return session;
1137 }
1138
1139 static void fastrpc_session_free(struct fastrpc_channel_ctx *cctx,
1140 struct fastrpc_session_ctx *session)
1141 {
1142 unsigned long flags;
1143
1144 spin_lock_irqsave(&cctx->lock, flags);
1145 session->used = false;
1146 spin_unlock_irqrestore(&cctx->lock, flags);
1147 }
1148
1149 static int fastrpc_release_current_dsp_process(struct fastrpc_user *fl)
1150 {
1151 struct fastrpc_invoke_args args[1];
1152 int tgid = 0;
1153 u32 sc;
1154
1155 tgid = fl->tgid;
1156 args[0].ptr = (u64)(uintptr_t) &tgid;
1157 args[0].length = sizeof(tgid);
1158 args[0].fd = -1;
1159 args[0].reserved = 0;
1160 sc = FASTRPC_SCALARS(FASTRPC_RMID_INIT_RELEASE, 1, 0);
1161
1162 return fastrpc_internal_invoke(fl, true, FASTRPC_INIT_HANDLE,
1163 sc, &args[0]);
1164 }
1165
1166 static int fastrpc_device_release(struct inode *inode, struct file *file)
1167 {
1168 struct fastrpc_user *fl = (struct fastrpc_user *)file->private_data;
1169 struct fastrpc_channel_ctx *cctx = fl->cctx;
1170 struct fastrpc_invoke_ctx *ctx, *n;
1171 struct fastrpc_map *map, *m;
1172 struct fastrpc_buf *buf, *b;
1173 unsigned long flags;
1174
1175 fastrpc_release_current_dsp_process(fl);
1176
1177 spin_lock_irqsave(&cctx->lock, flags);
1178 list_del(&fl->user);
1179 spin_unlock_irqrestore(&cctx->lock, flags);
1180
1181 if (fl->init_mem)
1182 fastrpc_buf_free(fl->init_mem);
1183
1184 list_for_each_entry_safe(ctx, n, &fl->pending, node) {
1185 list_del(&ctx->node);
1186 fastrpc_context_put(ctx);
1187 }
1188
1189 list_for_each_entry_safe(map, m, &fl->maps, node) {
1190 list_del(&map->node);
1191 fastrpc_map_put(map);
1192 }
1193
1194 list_for_each_entry_safe(buf, b, &fl->mmaps, node) {
1195 list_del(&buf->node);
1196 fastrpc_buf_free(buf);
1197 }
1198
1199 fastrpc_session_free(cctx, fl->sctx);
1200 fastrpc_channel_ctx_put(cctx);
1201
1202 mutex_destroy(&fl->mutex);
1203 kfree(fl);
1204 file->private_data = NULL;
1205
1206 return 0;
1207 }
1208
1209 static int fastrpc_device_open(struct inode *inode, struct file *filp)
1210 {
1211 struct fastrpc_channel_ctx *cctx = miscdev_to_cctx(filp->private_data);
1212 struct fastrpc_user *fl = NULL;
1213 unsigned long flags;
1214
1215 fl = kzalloc(sizeof(*fl), GFP_KERNEL);
1216 if (!fl)
1217 return -ENOMEM;
1218
1219 /* Released in fastrpc_device_release() */
1220 fastrpc_channel_ctx_get(cctx);
1221
1222 filp->private_data = fl;
1223 spin_lock_init(&fl->lock);
1224 mutex_init(&fl->mutex);
1225 INIT_LIST_HEAD(&fl->pending);
1226 INIT_LIST_HEAD(&fl->maps);
1227 INIT_LIST_HEAD(&fl->mmaps);
1228 INIT_LIST_HEAD(&fl->user);
1229 fl->tgid = current->tgid;
1230 fl->cctx = cctx;
1231
1232 fl->sctx = fastrpc_session_alloc(cctx);
1233 if (!fl->sctx) {
1234 dev_err(&cctx->rpdev->dev, "No session available\n");
1235 mutex_destroy(&fl->mutex);
1236 kfree(fl);
1237
1238 return -EBUSY;
1239 }
1240
1241 spin_lock_irqsave(&cctx->lock, flags);
1242 list_add_tail(&fl->user, &cctx->users);
1243 spin_unlock_irqrestore(&cctx->lock, flags);
1244
1245 return 0;
1246 }
1247
1248 static int fastrpc_dmabuf_alloc(struct fastrpc_user *fl, char __user *argp)
1249 {
1250 struct fastrpc_alloc_dma_buf bp;
1251 DEFINE_DMA_BUF_EXPORT_INFO(exp_info);
1252 struct fastrpc_buf *buf = NULL;
1253 int err;
1254
1255 if (copy_from_user(&bp, argp, sizeof(bp)))
1256 return -EFAULT;
1257
1258 err = fastrpc_buf_alloc(fl, fl->sctx->dev, bp.size, &buf);
1259 if (err)
1260 return err;
1261 exp_info.ops = &fastrpc_dma_buf_ops;
1262 exp_info.size = bp.size;
1263 exp_info.flags = O_RDWR;
1264 exp_info.priv = buf;
1265 buf->dmabuf = dma_buf_export(&exp_info);
1266 if (IS_ERR(buf->dmabuf)) {
1267 err = PTR_ERR(buf->dmabuf);
1268 fastrpc_buf_free(buf);
1269 return err;
1270 }
1271
1272 bp.fd = dma_buf_fd(buf->dmabuf, O_ACCMODE);
1273 if (bp.fd < 0) {
1274 dma_buf_put(buf->dmabuf);
1275 return -EINVAL;
1276 }
1277
1278 if (copy_to_user(argp, &bp, sizeof(bp))) {
1279 dma_buf_put(buf->dmabuf);
1280 return -EFAULT;
1281 }
1282
1283 return 0;
1284 }
1285
1286 static int fastrpc_init_attach(struct fastrpc_user *fl, int pd)
1287 {
1288 struct fastrpc_invoke_args args[1];
1289 int tgid = fl->tgid;
1290 u32 sc;
1291
1292 args[0].ptr = (u64)(uintptr_t) &tgid;
1293 args[0].length = sizeof(tgid);
1294 args[0].fd = -1;
1295 args[0].reserved = 0;
1296 sc = FASTRPC_SCALARS(FASTRPC_RMID_INIT_ATTACH, 1, 0);
1297 fl->pd = pd;
1298
1299 return fastrpc_internal_invoke(fl, true, FASTRPC_INIT_HANDLE,
1300 sc, &args[0]);
1301 }
1302
1303 static int fastrpc_invoke(struct fastrpc_user *fl, char __user *argp)
1304 {
1305 struct fastrpc_invoke_args *args = NULL;
1306 struct fastrpc_invoke inv;
1307 u32 nscalars;
1308 int err;
1309
1310 if (copy_from_user(&inv, argp, sizeof(inv)))
1311 return -EFAULT;
1312
1313 /* nscalars is truncated here to max supported value */
1314 nscalars = REMOTE_SCALARS_LENGTH(inv.sc);
1315 if (nscalars) {
1316 args = kcalloc(nscalars, sizeof(*args), GFP_KERNEL);
1317 if (!args)
1318 return -ENOMEM;
1319
1320 if (copy_from_user(args, (void __user *)(uintptr_t)inv.args,
1321 nscalars * sizeof(*args))) {
1322 kfree(args);
1323 return -EFAULT;
1324 }
1325 }
1326
1327 err = fastrpc_internal_invoke(fl, false, inv.handle, inv.sc, args);
1328 kfree(args);
1329
1330 return err;
1331 }
1332
1333 static int fastrpc_req_munmap_impl(struct fastrpc_user *fl,
1334 struct fastrpc_req_munmap *req)
1335 {
1336 struct fastrpc_invoke_args args[1] = { [0] = { 0 } };
1337 struct fastrpc_buf *buf, *b;
1338 struct fastrpc_munmap_req_msg req_msg;
1339 struct device *dev = fl->sctx->dev;
1340 int err;
1341 u32 sc;
1342
1343 spin_lock(&fl->lock);
1344 list_for_each_entry_safe(buf, b, &fl->mmaps, node) {
1345 if ((buf->raddr == req->vaddrout) && (buf->size == req->size))
1346 break;
1347 buf = NULL;
1348 }
1349 spin_unlock(&fl->lock);
1350
1351 if (!buf) {
1352 dev_err(dev, "mmap not in list\n");
1353 return -EINVAL;
1354 }
1355
1356 req_msg.pgid = fl->tgid;
1357 req_msg.size = buf->size;
1358 req_msg.vaddr = buf->raddr;
1359
1360 args[0].ptr = (u64) (uintptr_t) &req_msg;
1361 args[0].length = sizeof(req_msg);
1362
1363 sc = FASTRPC_SCALARS(FASTRPC_RMID_INIT_MUNMAP, 1, 0);
1364 err = fastrpc_internal_invoke(fl, true, FASTRPC_INIT_HANDLE, sc,
1365 &args[0]);
1366 if (!err) {
1367 dev_dbg(dev, "unmmap\tpt 0x%09lx OK\n", buf->raddr);
1368 spin_lock(&fl->lock);
1369 list_del(&buf->node);
1370 spin_unlock(&fl->lock);
1371 fastrpc_buf_free(buf);
1372 } else {
1373 dev_err(dev, "unmmap\tpt 0x%09lx ERROR\n", buf->raddr);
1374 }
1375
1376 return err;
1377 }
1378
1379 static int fastrpc_req_munmap(struct fastrpc_user *fl, char __user *argp)
1380 {
1381 struct fastrpc_req_munmap req;
1382
1383 if (copy_from_user(&req, argp, sizeof(req)))
1384 return -EFAULT;
1385
1386 return fastrpc_req_munmap_impl(fl, &req);
1387 }
1388
1389 static int fastrpc_req_mmap(struct fastrpc_user *fl, char __user *argp)
1390 {
1391 struct fastrpc_invoke_args args[3] = { [0 ... 2] = { 0 } };
1392 struct fastrpc_buf *buf = NULL;
1393 struct fastrpc_mmap_req_msg req_msg;
1394 struct fastrpc_mmap_rsp_msg rsp_msg;
1395 struct fastrpc_req_munmap req_unmap;
1396 struct fastrpc_phy_page pages;
1397 struct fastrpc_req_mmap req;
1398 struct device *dev = fl->sctx->dev;
1399 int err;
1400 u32 sc;
1401
1402 if (copy_from_user(&req, argp, sizeof(req)))
1403 return -EFAULT;
1404
1405 if (req.flags != ADSP_MMAP_ADD_PAGES) {
1406 dev_err(dev, "flag not supported 0x%x\n", req.flags);
1407 return -EINVAL;
1408 }
1409
1410 if (req.vaddrin) {
1411 dev_err(dev, "adding user allocated pages is not supported\n");
1412 return -EINVAL;
1413 }
1414
1415 err = fastrpc_buf_alloc(fl, fl->sctx->dev, req.size, &buf);
1416 if (err) {
1417 dev_err(dev, "failed to allocate buffer\n");
1418 return err;
1419 }
1420
1421 req_msg.pgid = fl->tgid;
1422 req_msg.flags = req.flags;
1423 req_msg.vaddr = req.vaddrin;
1424 req_msg.num = sizeof(pages);
1425
1426 args[0].ptr = (u64) (uintptr_t) &req_msg;
1427 args[0].length = sizeof(req_msg);
1428
1429 pages.addr = buf->phys;
1430 pages.size = buf->size;
1431
1432 args[1].ptr = (u64) (uintptr_t) &pages;
1433 args[1].length = sizeof(pages);
1434
1435 args[2].ptr = (u64) (uintptr_t) &rsp_msg;
1436 args[2].length = sizeof(rsp_msg);
1437
1438 sc = FASTRPC_SCALARS(FASTRPC_RMID_INIT_MMAP, 2, 1);
1439 err = fastrpc_internal_invoke(fl, true, FASTRPC_INIT_HANDLE, sc,
1440 &args[0]);
1441 if (err) {
1442 dev_err(dev, "mmap error (len 0x%08llx)\n", buf->size);
1443 goto err_invoke;
1444 }
1445
1446 /* update the buffer to be able to deallocate the memory on the DSP */
1447 buf->raddr = (uintptr_t) rsp_msg.vaddr;
1448
1449 /* let the client know the address to use */
1450 req.vaddrout = rsp_msg.vaddr;
1451
1452 spin_lock(&fl->lock);
1453 list_add_tail(&buf->node, &fl->mmaps);
1454 spin_unlock(&fl->lock);
1455
1456 if (copy_to_user((void __user *)argp, &req, sizeof(req))) {
1457 /* unmap the memory and release the buffer */
1458 req_unmap.vaddrout = buf->raddr;
1459 req_unmap.size = buf->size;
1460 fastrpc_req_munmap_impl(fl, &req_unmap);
1461 return -EFAULT;
1462 }
1463
1464 dev_dbg(dev, "mmap\t\tpt 0x%09lx OK [len 0x%08llx]\n",
1465 buf->raddr, buf->size);
1466
1467 return 0;
1468
1469 err_invoke:
1470 fastrpc_buf_free(buf);
1471
1472 return err;
1473 }
1474
1475 static long fastrpc_device_ioctl(struct file *file, unsigned int cmd,
1476 unsigned long arg)
1477 {
1478 struct fastrpc_user *fl = (struct fastrpc_user *)file->private_data;
1479 char __user *argp = (char __user *)arg;
1480 int err;
1481
1482 switch (cmd) {
1483 case FASTRPC_IOCTL_INVOKE:
1484 err = fastrpc_invoke(fl, argp);
1485 break;
1486 case FASTRPC_IOCTL_INIT_ATTACH:
1487 err = fastrpc_init_attach(fl, AUDIO_PD);
1488 break;
1489 case FASTRPC_IOCTL_INIT_ATTACH_SNS:
1490 err = fastrpc_init_attach(fl, SENSORS_PD);
1491 break;
1492 case FASTRPC_IOCTL_INIT_CREATE:
1493 err = fastrpc_init_create_process(fl, argp);
1494 break;
1495 case FASTRPC_IOCTL_ALLOC_DMA_BUFF:
1496 err = fastrpc_dmabuf_alloc(fl, argp);
1497 break;
1498 case FASTRPC_IOCTL_MMAP:
1499 err = fastrpc_req_mmap(fl, argp);
1500 break;
1501 case FASTRPC_IOCTL_MUNMAP:
1502 err = fastrpc_req_munmap(fl, argp);
1503 break;
1504 default:
1505 err = -ENOTTY;
1506 break;
1507 }
1508
1509 return err;
1510 }
1511
1512 static const struct file_operations fastrpc_fops = {
1513 .open = fastrpc_device_open,
1514 .release = fastrpc_device_release,
1515 .unlocked_ioctl = fastrpc_device_ioctl,
1516 .compat_ioctl = fastrpc_device_ioctl,
1517 };
1518
1519 static int fastrpc_cb_probe(struct platform_device *pdev)
1520 {
1521 struct fastrpc_channel_ctx *cctx;
1522 struct fastrpc_session_ctx *sess;
1523 struct device *dev = &pdev->dev;
1524 int i, sessions = 0;
1525 unsigned long flags;
1526 int rc;
1527
1528 cctx = dev_get_drvdata(dev->parent);
1529 if (!cctx)
1530 return -EINVAL;
1531
1532 of_property_read_u32(dev->of_node, "qcom,nsessions", &sessions);
1533
1534 spin_lock_irqsave(&cctx->lock, flags);
1535 sess = &cctx->session[cctx->sesscount];
1536 sess->used = false;
1537 sess->valid = true;
1538 sess->dev = dev;
1539 dev_set_drvdata(dev, sess);
1540
1541 if (of_property_read_u32(dev->of_node, "reg", &sess->sid))
1542 dev_info(dev, "FastRPC Session ID not specified in DT\n");
1543
1544 if (sessions > 0) {
1545 struct fastrpc_session_ctx *dup_sess;
1546
1547 for (i = 1; i < sessions; i++) {
1548 if (cctx->sesscount++ >= FASTRPC_MAX_SESSIONS)
1549 break;
1550 dup_sess = &cctx->session[cctx->sesscount];
1551 memcpy(dup_sess, sess, sizeof(*dup_sess));
1552 }
1553 }
1554 cctx->sesscount++;
1555 spin_unlock_irqrestore(&cctx->lock, flags);
1556 rc = dma_set_mask(dev, DMA_BIT_MASK(32));
1557 if (rc) {
1558 dev_err(dev, "32-bit DMA enable failed\n");
1559 return rc;
1560 }
1561
1562 return 0;
1563 }
1564
1565 static int fastrpc_cb_remove(struct platform_device *pdev)
1566 {
1567 struct fastrpc_channel_ctx *cctx = dev_get_drvdata(pdev->dev.parent);
1568 struct fastrpc_session_ctx *sess = dev_get_drvdata(&pdev->dev);
1569 unsigned long flags;
1570 int i;
1571
1572 spin_lock_irqsave(&cctx->lock, flags);
1573 for (i = 1; i < FASTRPC_MAX_SESSIONS; i++) {
1574 if (cctx->session[i].sid == sess->sid) {
1575 cctx->session[i].valid = false;
1576 cctx->sesscount--;
1577 }
1578 }
1579 spin_unlock_irqrestore(&cctx->lock, flags);
1580
1581 return 0;
1582 }
1583
1584 static const struct of_device_id fastrpc_match_table[] = {
1585 { .compatible = "qcom,fastrpc-compute-cb", },
1586 {}
1587 };
1588
1589 static struct platform_driver fastrpc_cb_driver = {
1590 .probe = fastrpc_cb_probe,
1591 .remove = fastrpc_cb_remove,
1592 .driver = {
1593 .name = "qcom,fastrpc-cb",
1594 .of_match_table = fastrpc_match_table,
1595 .suppress_bind_attrs = true,
1596 },
1597 };
1598
1599 static int fastrpc_rpmsg_probe(struct rpmsg_device *rpdev)
1600 {
1601 struct device *rdev = &rpdev->dev;
1602 struct fastrpc_channel_ctx *data;
1603 int i, err, domain_id = -1;
1604 const char *domain;
1605
1606 err = of_property_read_string(rdev->of_node, "label", &domain);
1607 if (err) {
1608 dev_info(rdev, "FastRPC Domain not specified in DT\n");
1609 return err;
1610 }
1611
1612 for (i = 0; i <= CDSP_DOMAIN_ID; i++) {
1613 if (!strcmp(domains[i], domain)) {
1614 domain_id = i;
1615 break;
1616 }
1617 }
1618
1619 if (domain_id < 0) {
1620 dev_info(rdev, "FastRPC Invalid Domain ID %d\n", domain_id);
1621 return -EINVAL;
1622 }
1623
1624 data = kzalloc(sizeof(*data), GFP_KERNEL);
1625 if (!data)
1626 return -ENOMEM;
1627
1628 data->miscdev.minor = MISC_DYNAMIC_MINOR;
1629 data->miscdev.name = devm_kasprintf(rdev, GFP_KERNEL, "fastrpc-%s",
1630 domains[domain_id]);
1631 data->miscdev.fops = &fastrpc_fops;
1632 err = misc_register(&data->miscdev);
1633 if (err) {
1634 kfree(data);
1635 return err;
1636 }
1637
1638 kref_init(&data->refcount);
1639
1640 dev_set_drvdata(&rpdev->dev, data);
1641 dma_set_mask_and_coherent(rdev, DMA_BIT_MASK(32));
1642 INIT_LIST_HEAD(&data->users);
1643 spin_lock_init(&data->lock);
1644 idr_init(&data->ctx_idr);
1645 data->domain_id = domain_id;
1646 data->rpdev = rpdev;
1647
1648 return of_platform_populate(rdev->of_node, NULL, NULL, rdev);
1649 }
1650
1651 static void fastrpc_notify_users(struct fastrpc_user *user)
1652 {
1653 struct fastrpc_invoke_ctx *ctx;
1654
1655 spin_lock(&user->lock);
1656 list_for_each_entry(ctx, &user->pending, node)
1657 complete(&ctx->work);
1658 spin_unlock(&user->lock);
1659 }
1660
1661 static void fastrpc_rpmsg_remove(struct rpmsg_device *rpdev)
1662 {
1663 struct fastrpc_channel_ctx *cctx = dev_get_drvdata(&rpdev->dev);
1664 struct fastrpc_user *user;
1665 unsigned long flags;
1666
1667 spin_lock_irqsave(&cctx->lock, flags);
1668 list_for_each_entry(user, &cctx->users, user)
1669 fastrpc_notify_users(user);
1670 spin_unlock_irqrestore(&cctx->lock, flags);
1671
1672 misc_deregister(&cctx->miscdev);
1673 of_platform_depopulate(&rpdev->dev);
1674
1675 cctx->rpdev = NULL;
1676 fastrpc_channel_ctx_put(cctx);
1677 }
1678
1679 static int fastrpc_rpmsg_callback(struct rpmsg_device *rpdev, void *data,
1680 int len, void *priv, u32 addr)
1681 {
1682 struct fastrpc_channel_ctx *cctx = dev_get_drvdata(&rpdev->dev);
1683 struct fastrpc_invoke_rsp *rsp = data;
1684 struct fastrpc_invoke_ctx *ctx;
1685 unsigned long flags;
1686 unsigned long ctxid;
1687
1688 if (len < sizeof(*rsp))
1689 return -EINVAL;
1690
1691 ctxid = ((rsp->ctx & FASTRPC_CTXID_MASK) >> 4);
1692
1693 spin_lock_irqsave(&cctx->lock, flags);
1694 ctx = idr_find(&cctx->ctx_idr, ctxid);
1695 spin_unlock_irqrestore(&cctx->lock, flags);
1696
1697 if (!ctx) {
1698 dev_err(&rpdev->dev, "No context ID matches response\n");
1699 return -ENOENT;
1700 }
1701
1702 ctx->retval = rsp->retval;
1703 complete(&ctx->work);
1704
1705 /*
1706 * The DMA buffer associated with the context cannot be freed in
1707 * interrupt context so schedule it through a worker thread to
1708 * avoid a kernel BUG.
1709 */
1710 schedule_work(&ctx->put_work);
1711
1712 return 0;
1713 }
1714
1715 static const struct of_device_id fastrpc_rpmsg_of_match[] = {
1716 { .compatible = "qcom,fastrpc" },
1717 { },
1718 };
1719 MODULE_DEVICE_TABLE(of, fastrpc_rpmsg_of_match);
1720
1721 static struct rpmsg_driver fastrpc_driver = {
1722 .probe = fastrpc_rpmsg_probe,
1723 .remove = fastrpc_rpmsg_remove,
1724 .callback = fastrpc_rpmsg_callback,
1725 .drv = {
1726 .name = "qcom,fastrpc",
1727 .of_match_table = fastrpc_rpmsg_of_match,
1728 },
1729 };
1730
1731 static int fastrpc_init(void)
1732 {
1733 int ret;
1734
1735 ret = platform_driver_register(&fastrpc_cb_driver);
1736 if (ret < 0) {
1737 pr_err("fastrpc: failed to register cb driver\n");
1738 return ret;
1739 }
1740
1741 ret = register_rpmsg_driver(&fastrpc_driver);
1742 if (ret < 0) {
1743 pr_err("fastrpc: failed to register rpmsg driver\n");
1744 platform_driver_unregister(&fastrpc_cb_driver);
1745 return ret;
1746 }
1747
1748 return 0;
1749 }
1750 module_init(fastrpc_init);
1751
1752 static void fastrpc_exit(void)
1753 {
1754 platform_driver_unregister(&fastrpc_cb_driver);
1755 unregister_rpmsg_driver(&fastrpc_driver);
1756 }
1757 module_exit(fastrpc_exit);
1758
1759 MODULE_LICENSE("GPL v2");
Linux with added FPC-III support