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
fastrpc_free_map(struct kref * ref)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 if (map->fl) {
251 spin_lock(&map->fl->lock);
252 list_del(&map->node);
253 spin_unlock(&map->fl->lock);
254 map->fl = NULL;
255 }
256
257 kfree(map);
258 }
259
fastrpc_map_put(struct fastrpc_map * map)260 static void fastrpc_map_put(struct fastrpc_map *map)
261 {
262 if (map)
263 kref_put(&map->refcount, fastrpc_free_map);
264 }
265
fastrpc_map_get(struct fastrpc_map * map)266 static int fastrpc_map_get(struct fastrpc_map *map)
267 {
268 if (!map)
269 return -ENOENT;
270
271 return kref_get_unless_zero(&map->refcount) ? 0 : -ENOENT;
272 }
273
fastrpc_map_find(struct fastrpc_user * fl,int fd,struct fastrpc_map ** ppmap)274 static int fastrpc_map_find(struct fastrpc_user *fl, int fd,
275 struct fastrpc_map **ppmap)
276 {
277 struct fastrpc_map *map = NULL;
278
279 mutex_lock(&fl->mutex);
280 list_for_each_entry(map, &fl->maps, node) {
281 if (map->fd == fd) {
282 fastrpc_map_get(map);
283 *ppmap = map;
284 mutex_unlock(&fl->mutex);
285 return 0;
286 }
287 }
288 mutex_unlock(&fl->mutex);
289
290 return -ENOENT;
291 }
292
fastrpc_buf_free(struct fastrpc_buf * buf)293 static void fastrpc_buf_free(struct fastrpc_buf *buf)
294 {
295 dma_free_coherent(buf->dev, buf->size, buf->virt,
296 FASTRPC_PHYS(buf->phys));
297 kfree(buf);
298 }
299
fastrpc_buf_alloc(struct fastrpc_user * fl,struct device * dev,u64 size,struct fastrpc_buf ** obuf)300 static int fastrpc_buf_alloc(struct fastrpc_user *fl, struct device *dev,
301 u64 size, struct fastrpc_buf **obuf)
302 {
303 struct fastrpc_buf *buf;
304
305 buf = kzalloc(sizeof(*buf), GFP_KERNEL);
306 if (!buf)
307 return -ENOMEM;
308
309 INIT_LIST_HEAD(&buf->attachments);
310 INIT_LIST_HEAD(&buf->node);
311 mutex_init(&buf->lock);
312
313 buf->fl = fl;
314 buf->virt = NULL;
315 buf->phys = 0;
316 buf->size = size;
317 buf->dev = dev;
318 buf->raddr = 0;
319
320 buf->virt = dma_alloc_coherent(dev, buf->size, (dma_addr_t *)&buf->phys,
321 GFP_KERNEL);
322 if (!buf->virt) {
323 mutex_destroy(&buf->lock);
324 kfree(buf);
325 return -ENOMEM;
326 }
327
328 if (fl->sctx && fl->sctx->sid)
329 buf->phys += ((u64)fl->sctx->sid << 32);
330
331 *obuf = buf;
332
333 return 0;
334 }
335
fastrpc_channel_ctx_free(struct kref * ref)336 static void fastrpc_channel_ctx_free(struct kref *ref)
337 {
338 struct fastrpc_channel_ctx *cctx;
339
340 cctx = container_of(ref, struct fastrpc_channel_ctx, refcount);
341
342 kfree(cctx);
343 }
344
fastrpc_channel_ctx_get(struct fastrpc_channel_ctx * cctx)345 static void fastrpc_channel_ctx_get(struct fastrpc_channel_ctx *cctx)
346 {
347 kref_get(&cctx->refcount);
348 }
349
fastrpc_channel_ctx_put(struct fastrpc_channel_ctx * cctx)350 static void fastrpc_channel_ctx_put(struct fastrpc_channel_ctx *cctx)
351 {
352 kref_put(&cctx->refcount, fastrpc_channel_ctx_free);
353 }
354
fastrpc_context_free(struct kref * ref)355 static void fastrpc_context_free(struct kref *ref)
356 {
357 struct fastrpc_invoke_ctx *ctx;
358 struct fastrpc_channel_ctx *cctx;
359 unsigned long flags;
360 int i;
361
362 ctx = container_of(ref, struct fastrpc_invoke_ctx, refcount);
363 cctx = ctx->cctx;
364
365 for (i = 0; i < ctx->nscalars; i++)
366 fastrpc_map_put(ctx->maps[i]);
367
368 if (ctx->buf)
369 fastrpc_buf_free(ctx->buf);
370
371 spin_lock_irqsave(&cctx->lock, flags);
372 idr_remove(&cctx->ctx_idr, ctx->ctxid >> 4);
373 spin_unlock_irqrestore(&cctx->lock, flags);
374
375 kfree(ctx->maps);
376 kfree(ctx->olaps);
377 kfree(ctx);
378
379 fastrpc_channel_ctx_put(cctx);
380 }
381
fastrpc_context_get(struct fastrpc_invoke_ctx * ctx)382 static void fastrpc_context_get(struct fastrpc_invoke_ctx *ctx)
383 {
384 kref_get(&ctx->refcount);
385 }
386
fastrpc_context_put(struct fastrpc_invoke_ctx * ctx)387 static void fastrpc_context_put(struct fastrpc_invoke_ctx *ctx)
388 {
389 kref_put(&ctx->refcount, fastrpc_context_free);
390 }
391
fastrpc_context_put_wq(struct work_struct * work)392 static void fastrpc_context_put_wq(struct work_struct *work)
393 {
394 struct fastrpc_invoke_ctx *ctx =
395 container_of(work, struct fastrpc_invoke_ctx, put_work);
396
397 fastrpc_context_put(ctx);
398 }
399
400 #define CMP(aa, bb) ((aa) == (bb) ? 0 : (aa) < (bb) ? -1 : 1)
olaps_cmp(const void * a,const void * b)401 static int olaps_cmp(const void *a, const void *b)
402 {
403 struct fastrpc_buf_overlap *pa = (struct fastrpc_buf_overlap *)a;
404 struct fastrpc_buf_overlap *pb = (struct fastrpc_buf_overlap *)b;
405 /* sort with lowest starting buffer first */
406 int st = CMP(pa->start, pb->start);
407 /* sort with highest ending buffer first */
408 int ed = CMP(pb->end, pa->end);
409
410 return st == 0 ? ed : st;
411 }
412
fastrpc_get_buff_overlaps(struct fastrpc_invoke_ctx * ctx)413 static void fastrpc_get_buff_overlaps(struct fastrpc_invoke_ctx *ctx)
414 {
415 u64 max_end = 0;
416 int i;
417
418 for (i = 0; i < ctx->nbufs; ++i) {
419 ctx->olaps[i].start = ctx->args[i].ptr;
420 ctx->olaps[i].end = ctx->olaps[i].start + ctx->args[i].length;
421 ctx->olaps[i].raix = i;
422 }
423
424 sort(ctx->olaps, ctx->nbufs, sizeof(*ctx->olaps), olaps_cmp, NULL);
425
426 for (i = 0; i < ctx->nbufs; ++i) {
427 /* Falling inside previous range */
428 if (ctx->olaps[i].start < max_end) {
429 ctx->olaps[i].mstart = max_end;
430 ctx->olaps[i].mend = ctx->olaps[i].end;
431 ctx->olaps[i].offset = max_end - ctx->olaps[i].start;
432
433 if (ctx->olaps[i].end > max_end) {
434 max_end = ctx->olaps[i].end;
435 } else {
436 ctx->olaps[i].mend = 0;
437 ctx->olaps[i].mstart = 0;
438 }
439
440 } else {
441 ctx->olaps[i].mend = ctx->olaps[i].end;
442 ctx->olaps[i].mstart = ctx->olaps[i].start;
443 ctx->olaps[i].offset = 0;
444 max_end = ctx->olaps[i].end;
445 }
446 }
447 }
448
fastrpc_context_alloc(struct fastrpc_user * user,u32 kernel,u32 sc,struct fastrpc_invoke_args * args)449 static struct fastrpc_invoke_ctx *fastrpc_context_alloc(
450 struct fastrpc_user *user, u32 kernel, u32 sc,
451 struct fastrpc_invoke_args *args)
452 {
453 struct fastrpc_channel_ctx *cctx = user->cctx;
454 struct fastrpc_invoke_ctx *ctx = NULL;
455 unsigned long flags;
456 int ret;
457
458 ctx = kzalloc(sizeof(*ctx), GFP_KERNEL);
459 if (!ctx)
460 return ERR_PTR(-ENOMEM);
461
462 INIT_LIST_HEAD(&ctx->node);
463 ctx->fl = user;
464 ctx->nscalars = REMOTE_SCALARS_LENGTH(sc);
465 ctx->nbufs = REMOTE_SCALARS_INBUFS(sc) +
466 REMOTE_SCALARS_OUTBUFS(sc);
467
468 if (ctx->nscalars) {
469 ctx->maps = kcalloc(ctx->nscalars,
470 sizeof(*ctx->maps), GFP_KERNEL);
471 if (!ctx->maps) {
472 kfree(ctx);
473 return ERR_PTR(-ENOMEM);
474 }
475 ctx->olaps = kcalloc(ctx->nscalars,
476 sizeof(*ctx->olaps), GFP_KERNEL);
477 if (!ctx->olaps) {
478 kfree(ctx->maps);
479 kfree(ctx);
480 return ERR_PTR(-ENOMEM);
481 }
482 ctx->args = args;
483 fastrpc_get_buff_overlaps(ctx);
484 }
485
486 /* Released in fastrpc_context_put() */
487 fastrpc_channel_ctx_get(cctx);
488
489 ctx->sc = sc;
490 ctx->retval = -1;
491 ctx->pid = current->pid;
492 ctx->tgid = user->tgid;
493 ctx->cctx = cctx;
494 init_completion(&ctx->work);
495 INIT_WORK(&ctx->put_work, fastrpc_context_put_wq);
496
497 spin_lock(&user->lock);
498 list_add_tail(&ctx->node, &user->pending);
499 spin_unlock(&user->lock);
500
501 spin_lock_irqsave(&cctx->lock, flags);
502 ret = idr_alloc_cyclic(&cctx->ctx_idr, ctx, 1,
503 FASTRPC_CTX_MAX, GFP_ATOMIC);
504 if (ret < 0) {
505 spin_unlock_irqrestore(&cctx->lock, flags);
506 goto err_idr;
507 }
508 ctx->ctxid = ret << 4;
509 spin_unlock_irqrestore(&cctx->lock, flags);
510
511 kref_init(&ctx->refcount);
512
513 return ctx;
514 err_idr:
515 spin_lock(&user->lock);
516 list_del(&ctx->node);
517 spin_unlock(&user->lock);
518 fastrpc_channel_ctx_put(cctx);
519 kfree(ctx->maps);
520 kfree(ctx->olaps);
521 kfree(ctx);
522
523 return ERR_PTR(ret);
524 }
525
526 static struct sg_table *
fastrpc_map_dma_buf(struct dma_buf_attachment * attachment,enum dma_data_direction dir)527 fastrpc_map_dma_buf(struct dma_buf_attachment *attachment,
528 enum dma_data_direction dir)
529 {
530 struct fastrpc_dma_buf_attachment *a = attachment->priv;
531 struct sg_table *table;
532 int ret;
533
534 table = &a->sgt;
535
536 ret = dma_map_sgtable(attachment->dev, table, dir, 0);
537 if (ret)
538 table = ERR_PTR(ret);
539 return table;
540 }
541
fastrpc_unmap_dma_buf(struct dma_buf_attachment * attach,struct sg_table * table,enum dma_data_direction dir)542 static void fastrpc_unmap_dma_buf(struct dma_buf_attachment *attach,
543 struct sg_table *table,
544 enum dma_data_direction dir)
545 {
546 dma_unmap_sgtable(attach->dev, table, dir, 0);
547 }
548
fastrpc_release(struct dma_buf * dmabuf)549 static void fastrpc_release(struct dma_buf *dmabuf)
550 {
551 struct fastrpc_buf *buffer = dmabuf->priv;
552
553 fastrpc_buf_free(buffer);
554 }
555
fastrpc_dma_buf_attach(struct dma_buf * dmabuf,struct dma_buf_attachment * attachment)556 static int fastrpc_dma_buf_attach(struct dma_buf *dmabuf,
557 struct dma_buf_attachment *attachment)
558 {
559 struct fastrpc_dma_buf_attachment *a;
560 struct fastrpc_buf *buffer = dmabuf->priv;
561 int ret;
562
563 a = kzalloc(sizeof(*a), GFP_KERNEL);
564 if (!a)
565 return -ENOMEM;
566
567 ret = dma_get_sgtable(buffer->dev, &a->sgt, buffer->virt,
568 FASTRPC_PHYS(buffer->phys), buffer->size);
569 if (ret < 0) {
570 dev_err(buffer->dev, "failed to get scatterlist from DMA API\n");
571 kfree(a);
572 return -EINVAL;
573 }
574
575 a->dev = attachment->dev;
576 INIT_LIST_HEAD(&a->node);
577 attachment->priv = a;
578
579 mutex_lock(&buffer->lock);
580 list_add(&a->node, &buffer->attachments);
581 mutex_unlock(&buffer->lock);
582
583 return 0;
584 }
585
fastrpc_dma_buf_detatch(struct dma_buf * dmabuf,struct dma_buf_attachment * attachment)586 static void fastrpc_dma_buf_detatch(struct dma_buf *dmabuf,
587 struct dma_buf_attachment *attachment)
588 {
589 struct fastrpc_dma_buf_attachment *a = attachment->priv;
590 struct fastrpc_buf *buffer = dmabuf->priv;
591
592 mutex_lock(&buffer->lock);
593 list_del(&a->node);
594 mutex_unlock(&buffer->lock);
595 sg_free_table(&a->sgt);
596 kfree(a);
597 }
598
fastrpc_vmap(struct dma_buf * dmabuf,struct dma_buf_map * map)599 static int fastrpc_vmap(struct dma_buf *dmabuf, struct dma_buf_map *map)
600 {
601 struct fastrpc_buf *buf = dmabuf->priv;
602
603 dma_buf_map_set_vaddr(map, buf->virt);
604
605 return 0;
606 }
607
fastrpc_mmap(struct dma_buf * dmabuf,struct vm_area_struct * vma)608 static int fastrpc_mmap(struct dma_buf *dmabuf,
609 struct vm_area_struct *vma)
610 {
611 struct fastrpc_buf *buf = dmabuf->priv;
612 size_t size = vma->vm_end - vma->vm_start;
613
614 return dma_mmap_coherent(buf->dev, vma, buf->virt,
615 FASTRPC_PHYS(buf->phys), size);
616 }
617
618 static const struct dma_buf_ops fastrpc_dma_buf_ops = {
619 .attach = fastrpc_dma_buf_attach,
620 .detach = fastrpc_dma_buf_detatch,
621 .map_dma_buf = fastrpc_map_dma_buf,
622 .unmap_dma_buf = fastrpc_unmap_dma_buf,
623 .mmap = fastrpc_mmap,
624 .vmap = fastrpc_vmap,
625 .release = fastrpc_release,
626 };
627
fastrpc_map_create(struct fastrpc_user * fl,int fd,u64 len,struct fastrpc_map ** ppmap)628 static int fastrpc_map_create(struct fastrpc_user *fl, int fd,
629 u64 len, struct fastrpc_map **ppmap)
630 {
631 struct fastrpc_session_ctx *sess = fl->sctx;
632 struct fastrpc_map *map = NULL;
633 int err = 0;
634
635 if (!fastrpc_map_find(fl, fd, ppmap))
636 return 0;
637
638 map = kzalloc(sizeof(*map), GFP_KERNEL);
639 if (!map)
640 return -ENOMEM;
641
642 INIT_LIST_HEAD(&map->node);
643 map->fl = fl;
644 map->fd = fd;
645 map->buf = dma_buf_get(fd);
646 if (IS_ERR(map->buf)) {
647 err = PTR_ERR(map->buf);
648 goto get_err;
649 }
650
651 map->attach = dma_buf_attach(map->buf, sess->dev);
652 if (IS_ERR(map->attach)) {
653 dev_err(sess->dev, "Failed to attach dmabuf\n");
654 err = PTR_ERR(map->attach);
655 goto attach_err;
656 }
657
658 map->table = dma_buf_map_attachment(map->attach, DMA_BIDIRECTIONAL);
659 if (IS_ERR(map->table)) {
660 err = PTR_ERR(map->table);
661 goto map_err;
662 }
663
664 map->phys = sg_dma_address(map->table->sgl);
665 map->phys += ((u64)fl->sctx->sid << 32);
666 map->size = len;
667 map->va = sg_virt(map->table->sgl);
668 map->len = len;
669 kref_init(&map->refcount);
670
671 spin_lock(&fl->lock);
672 list_add_tail(&map->node, &fl->maps);
673 spin_unlock(&fl->lock);
674 *ppmap = map;
675
676 return 0;
677
678 map_err:
679 dma_buf_detach(map->buf, map->attach);
680 attach_err:
681 dma_buf_put(map->buf);
682 get_err:
683 kfree(map);
684
685 return err;
686 }
687
688 /*
689 * Fastrpc payload buffer with metadata looks like:
690 *
691 * >>>>>> START of METADATA <<<<<<<<<
692 * +---------------------------------+
693 * | Arguments |
694 * | type:(struct fastrpc_remote_arg)|
695 * | (0 - N) |
696 * +---------------------------------+
697 * | Invoke Buffer list |
698 * | type:(struct fastrpc_invoke_buf)|
699 * | (0 - N) |
700 * +---------------------------------+
701 * | Page info list |
702 * | type:(struct fastrpc_phy_page) |
703 * | (0 - N) |
704 * +---------------------------------+
705 * | Optional info |
706 * |(can be specific to SoC/Firmware)|
707 * +---------------------------------+
708 * >>>>>>>> END of METADATA <<<<<<<<<
709 * +---------------------------------+
710 * | Inline ARGS |
711 * | (0-N) |
712 * +---------------------------------+
713 */
714
fastrpc_get_meta_size(struct fastrpc_invoke_ctx * ctx)715 static int fastrpc_get_meta_size(struct fastrpc_invoke_ctx *ctx)
716 {
717 int size = 0;
718
719 size = (sizeof(struct fastrpc_remote_arg) +
720 sizeof(struct fastrpc_invoke_buf) +
721 sizeof(struct fastrpc_phy_page)) * ctx->nscalars +
722 sizeof(u64) * FASTRPC_MAX_FDLIST +
723 sizeof(u32) * FASTRPC_MAX_CRCLIST;
724
725 return size;
726 }
727
fastrpc_get_payload_size(struct fastrpc_invoke_ctx * ctx,int metalen)728 static u64 fastrpc_get_payload_size(struct fastrpc_invoke_ctx *ctx, int metalen)
729 {
730 u64 size = 0;
731 int oix;
732
733 size = ALIGN(metalen, FASTRPC_ALIGN);
734 for (oix = 0; oix < ctx->nbufs; oix++) {
735 int i = ctx->olaps[oix].raix;
736
737 if (ctx->args[i].fd == 0 || ctx->args[i].fd == -1) {
738
739 if (ctx->olaps[oix].offset == 0)
740 size = ALIGN(size, FASTRPC_ALIGN);
741
742 size += (ctx->olaps[oix].mend - ctx->olaps[oix].mstart);
743 }
744 }
745
746 return size;
747 }
748
fastrpc_create_maps(struct fastrpc_invoke_ctx * ctx)749 static int fastrpc_create_maps(struct fastrpc_invoke_ctx *ctx)
750 {
751 struct device *dev = ctx->fl->sctx->dev;
752 int i, err;
753
754 for (i = 0; i < ctx->nscalars; ++i) {
755 /* Make sure reserved field is set to 0 */
756 if (ctx->args[i].reserved)
757 return -EINVAL;
758
759 if (ctx->args[i].fd == 0 || ctx->args[i].fd == -1 ||
760 ctx->args[i].length == 0)
761 continue;
762
763 err = fastrpc_map_create(ctx->fl, ctx->args[i].fd,
764 ctx->args[i].length, &ctx->maps[i]);
765 if (err) {
766 dev_err(dev, "Error Creating map %d\n", err);
767 return -EINVAL;
768 }
769
770 }
771 return 0;
772 }
773
fastrpc_get_args(u32 kernel,struct fastrpc_invoke_ctx * ctx)774 static int fastrpc_get_args(u32 kernel, struct fastrpc_invoke_ctx *ctx)
775 {
776 struct device *dev = ctx->fl->sctx->dev;
777 struct fastrpc_remote_arg *rpra;
778 struct fastrpc_invoke_buf *list;
779 struct fastrpc_phy_page *pages;
780 int inbufs, i, oix, err = 0;
781 u64 len, rlen, pkt_size;
782 u64 pg_start, pg_end;
783 uintptr_t args;
784 int metalen;
785
786 inbufs = REMOTE_SCALARS_INBUFS(ctx->sc);
787 metalen = fastrpc_get_meta_size(ctx);
788 pkt_size = fastrpc_get_payload_size(ctx, metalen);
789
790 err = fastrpc_create_maps(ctx);
791 if (err)
792 return err;
793
794 ctx->msg_sz = pkt_size;
795
796 err = fastrpc_buf_alloc(ctx->fl, dev, pkt_size, &ctx->buf);
797 if (err)
798 return err;
799
800 rpra = ctx->buf->virt;
801 list = ctx->buf->virt + ctx->nscalars * sizeof(*rpra);
802 pages = ctx->buf->virt + ctx->nscalars * (sizeof(*list) +
803 sizeof(*rpra));
804 args = (uintptr_t)ctx->buf->virt + metalen;
805 rlen = pkt_size - metalen;
806 ctx->rpra = rpra;
807
808 for (oix = 0; oix < ctx->nbufs; ++oix) {
809 int mlen;
810
811 i = ctx->olaps[oix].raix;
812 len = ctx->args[i].length;
813
814 rpra[i].pv = 0;
815 rpra[i].len = len;
816 list[i].num = len ? 1 : 0;
817 list[i].pgidx = i;
818
819 if (!len)
820 continue;
821
822 if (ctx->maps[i]) {
823 struct vm_area_struct *vma = NULL;
824
825 rpra[i].pv = (u64) ctx->args[i].ptr;
826 pages[i].addr = ctx->maps[i]->phys;
827
828 mmap_read_lock(current->mm);
829 vma = find_vma(current->mm, ctx->args[i].ptr);
830 if (vma)
831 pages[i].addr += ctx->args[i].ptr -
832 vma->vm_start;
833 mmap_read_unlock(current->mm);
834
835 pg_start = (ctx->args[i].ptr & PAGE_MASK) >> PAGE_SHIFT;
836 pg_end = ((ctx->args[i].ptr + len - 1) & PAGE_MASK) >>
837 PAGE_SHIFT;
838 pages[i].size = (pg_end - pg_start + 1) * PAGE_SIZE;
839
840 } else {
841
842 if (ctx->olaps[oix].offset == 0) {
843 rlen -= ALIGN(args, FASTRPC_ALIGN) - args;
844 args = ALIGN(args, FASTRPC_ALIGN);
845 }
846
847 mlen = ctx->olaps[oix].mend - ctx->olaps[oix].mstart;
848
849 if (rlen < mlen)
850 goto bail;
851
852 rpra[i].pv = args - ctx->olaps[oix].offset;
853 pages[i].addr = ctx->buf->phys -
854 ctx->olaps[oix].offset +
855 (pkt_size - rlen);
856 pages[i].addr = pages[i].addr & PAGE_MASK;
857
858 pg_start = (args & PAGE_MASK) >> PAGE_SHIFT;
859 pg_end = ((args + len - 1) & PAGE_MASK) >> PAGE_SHIFT;
860 pages[i].size = (pg_end - pg_start + 1) * PAGE_SIZE;
861 args = args + mlen;
862 rlen -= mlen;
863 }
864
865 if (i < inbufs && !ctx->maps[i]) {
866 void *dst = (void *)(uintptr_t)rpra[i].pv;
867 void *src = (void *)(uintptr_t)ctx->args[i].ptr;
868
869 if (!kernel) {
870 if (copy_from_user(dst, (void __user *)src,
871 len)) {
872 err = -EFAULT;
873 goto bail;
874 }
875 } else {
876 memcpy(dst, src, len);
877 }
878 }
879 }
880
881 for (i = ctx->nbufs; i < ctx->nscalars; ++i) {
882 rpra[i].pv = (u64) ctx->args[i].ptr;
883 rpra[i].len = ctx->args[i].length;
884 list[i].num = ctx->args[i].length ? 1 : 0;
885 list[i].pgidx = i;
886 pages[i].addr = ctx->maps[i]->phys;
887 pages[i].size = ctx->maps[i]->size;
888 }
889
890 bail:
891 if (err)
892 dev_err(dev, "Error: get invoke args failed:%d\n", err);
893
894 return err;
895 }
896
fastrpc_put_args(struct fastrpc_invoke_ctx * ctx,u32 kernel)897 static int fastrpc_put_args(struct fastrpc_invoke_ctx *ctx,
898 u32 kernel)
899 {
900 struct fastrpc_remote_arg *rpra = ctx->rpra;
901 int i, inbufs;
902
903 inbufs = REMOTE_SCALARS_INBUFS(ctx->sc);
904
905 for (i = inbufs; i < ctx->nbufs; ++i) {
906 void *src = (void *)(uintptr_t)rpra[i].pv;
907 void *dst = (void *)(uintptr_t)ctx->args[i].ptr;
908 u64 len = rpra[i].len;
909
910 if (!kernel) {
911 if (copy_to_user((void __user *)dst, src, len))
912 return -EFAULT;
913 } else {
914 memcpy(dst, src, len);
915 }
916 }
917
918 return 0;
919 }
920
fastrpc_invoke_send(struct fastrpc_session_ctx * sctx,struct fastrpc_invoke_ctx * ctx,u32 kernel,uint32_t handle)921 static int fastrpc_invoke_send(struct fastrpc_session_ctx *sctx,
922 struct fastrpc_invoke_ctx *ctx,
923 u32 kernel, uint32_t handle)
924 {
925 struct fastrpc_channel_ctx *cctx;
926 struct fastrpc_user *fl = ctx->fl;
927 struct fastrpc_msg *msg = &ctx->msg;
928 int ret;
929
930 cctx = fl->cctx;
931 msg->pid = fl->tgid;
932 msg->tid = current->pid;
933
934 if (kernel)
935 msg->pid = 0;
936
937 msg->ctx = ctx->ctxid | fl->pd;
938 msg->handle = handle;
939 msg->sc = ctx->sc;
940 msg->addr = ctx->buf ? ctx->buf->phys : 0;
941 msg->size = roundup(ctx->msg_sz, PAGE_SIZE);
942 fastrpc_context_get(ctx);
943
944 ret = rpmsg_send(cctx->rpdev->ept, (void *)msg, sizeof(*msg));
945
946 if (ret)
947 fastrpc_context_put(ctx);
948
949 return ret;
950
951 }
952
fastrpc_internal_invoke(struct fastrpc_user * fl,u32 kernel,u32 handle,u32 sc,struct fastrpc_invoke_args * args)953 static int fastrpc_internal_invoke(struct fastrpc_user *fl, u32 kernel,
954 u32 handle, u32 sc,
955 struct fastrpc_invoke_args *args)
956 {
957 struct fastrpc_invoke_ctx *ctx = NULL;
958 int err = 0;
959
960 if (!fl->sctx)
961 return -EINVAL;
962
963 if (!fl->cctx->rpdev)
964 return -EPIPE;
965
966 if (handle == FASTRPC_INIT_HANDLE && !kernel) {
967 dev_warn_ratelimited(fl->sctx->dev, "user app trying to send a kernel RPC message (%d)\n", handle);
968 return -EPERM;
969 }
970
971 ctx = fastrpc_context_alloc(fl, kernel, sc, args);
972 if (IS_ERR(ctx))
973 return PTR_ERR(ctx);
974
975 if (ctx->nscalars) {
976 err = fastrpc_get_args(kernel, ctx);
977 if (err)
978 goto bail;
979 }
980
981 /* make sure that all CPU memory writes are seen by DSP */
982 dma_wmb();
983 /* Send invoke buffer to remote dsp */
984 err = fastrpc_invoke_send(fl->sctx, ctx, kernel, handle);
985 if (err)
986 goto bail;
987
988 if (kernel) {
989 if (!wait_for_completion_timeout(&ctx->work, 10 * HZ))
990 err = -ETIMEDOUT;
991 } else {
992 err = wait_for_completion_interruptible(&ctx->work);
993 }
994
995 if (err)
996 goto bail;
997
998 if (ctx->nscalars) {
999 /* make sure that all memory writes by DSP are seen by CPU */
1000 dma_rmb();
1001 /* populate all the output buffers with results */
1002 err = fastrpc_put_args(ctx, kernel);
1003 if (err)
1004 goto bail;
1005 }
1006
1007 /* Check the response from remote dsp */
1008 err = ctx->retval;
1009 if (err)
1010 goto bail;
1011
1012 bail:
1013 if (err != -ERESTARTSYS && err != -ETIMEDOUT) {
1014 /* We are done with this compute context */
1015 spin_lock(&fl->lock);
1016 list_del(&ctx->node);
1017 spin_unlock(&fl->lock);
1018 fastrpc_context_put(ctx);
1019 }
1020 if (err)
1021 dev_dbg(fl->sctx->dev, "Error: Invoke Failed %d\n", err);
1022
1023 return err;
1024 }
1025
fastrpc_init_create_process(struct fastrpc_user * fl,char __user * argp)1026 static int fastrpc_init_create_process(struct fastrpc_user *fl,
1027 char __user *argp)
1028 {
1029 struct fastrpc_init_create init;
1030 struct fastrpc_invoke_args *args;
1031 struct fastrpc_phy_page pages[1];
1032 struct fastrpc_map *map = NULL;
1033 struct fastrpc_buf *imem = NULL;
1034 int memlen;
1035 int err;
1036 struct {
1037 int pgid;
1038 u32 namelen;
1039 u32 filelen;
1040 u32 pageslen;
1041 u32 attrs;
1042 u32 siglen;
1043 } inbuf;
1044 u32 sc;
1045
1046 args = kcalloc(FASTRPC_CREATE_PROCESS_NARGS, sizeof(*args), GFP_KERNEL);
1047 if (!args)
1048 return -ENOMEM;
1049
1050 if (copy_from_user(&init, argp, sizeof(init))) {
1051 err = -EFAULT;
1052 goto err;
1053 }
1054
1055 if (init.filelen > INIT_FILELEN_MAX) {
1056 err = -EINVAL;
1057 goto err;
1058 }
1059
1060 inbuf.pgid = fl->tgid;
1061 inbuf.namelen = strlen(current->comm) + 1;
1062 inbuf.filelen = init.filelen;
1063 inbuf.pageslen = 1;
1064 inbuf.attrs = init.attrs;
1065 inbuf.siglen = init.siglen;
1066 fl->pd = USER_PD;
1067
1068 if (init.filelen && init.filefd) {
1069 err = fastrpc_map_create(fl, init.filefd, init.filelen, &map);
1070 if (err)
1071 goto err;
1072 }
1073
1074 memlen = ALIGN(max(INIT_FILELEN_MAX, (int)init.filelen * 4),
1075 1024 * 1024);
1076 err = fastrpc_buf_alloc(fl, fl->sctx->dev, memlen,
1077 &imem);
1078 if (err)
1079 goto err_alloc;
1080
1081 fl->init_mem = imem;
1082 args[0].ptr = (u64)(uintptr_t)&inbuf;
1083 args[0].length = sizeof(inbuf);
1084 args[0].fd = -1;
1085
1086 args[1].ptr = (u64)(uintptr_t)current->comm;
1087 args[1].length = inbuf.namelen;
1088 args[1].fd = -1;
1089
1090 args[2].ptr = (u64) init.file;
1091 args[2].length = inbuf.filelen;
1092 args[2].fd = init.filefd;
1093
1094 pages[0].addr = imem->phys;
1095 pages[0].size = imem->size;
1096
1097 args[3].ptr = (u64)(uintptr_t) pages;
1098 args[3].length = 1 * sizeof(*pages);
1099 args[3].fd = -1;
1100
1101 args[4].ptr = (u64)(uintptr_t)&inbuf.attrs;
1102 args[4].length = sizeof(inbuf.attrs);
1103 args[4].fd = -1;
1104
1105 args[5].ptr = (u64)(uintptr_t) &inbuf.siglen;
1106 args[5].length = sizeof(inbuf.siglen);
1107 args[5].fd = -1;
1108
1109 sc = FASTRPC_SCALARS(FASTRPC_RMID_INIT_CREATE, 4, 0);
1110 if (init.attrs)
1111 sc = FASTRPC_SCALARS(FASTRPC_RMID_INIT_CREATE_ATTR, 4, 0);
1112
1113 err = fastrpc_internal_invoke(fl, true, FASTRPC_INIT_HANDLE,
1114 sc, args);
1115 if (err)
1116 goto err_invoke;
1117
1118 kfree(args);
1119
1120 return 0;
1121
1122 err_invoke:
1123 fl->init_mem = NULL;
1124 fastrpc_buf_free(imem);
1125 err_alloc:
1126 fastrpc_map_put(map);
1127 err:
1128 kfree(args);
1129
1130 return err;
1131 }
1132
fastrpc_session_alloc(struct fastrpc_channel_ctx * cctx)1133 static struct fastrpc_session_ctx *fastrpc_session_alloc(
1134 struct fastrpc_channel_ctx *cctx)
1135 {
1136 struct fastrpc_session_ctx *session = NULL;
1137 unsigned long flags;
1138 int i;
1139
1140 spin_lock_irqsave(&cctx->lock, flags);
1141 for (i = 0; i < cctx->sesscount; i++) {
1142 if (!cctx->session[i].used && cctx->session[i].valid) {
1143 cctx->session[i].used = true;
1144 session = &cctx->session[i];
1145 break;
1146 }
1147 }
1148 spin_unlock_irqrestore(&cctx->lock, flags);
1149
1150 return session;
1151 }
1152
fastrpc_session_free(struct fastrpc_channel_ctx * cctx,struct fastrpc_session_ctx * session)1153 static void fastrpc_session_free(struct fastrpc_channel_ctx *cctx,
1154 struct fastrpc_session_ctx *session)
1155 {
1156 unsigned long flags;
1157
1158 spin_lock_irqsave(&cctx->lock, flags);
1159 session->used = false;
1160 spin_unlock_irqrestore(&cctx->lock, flags);
1161 }
1162
fastrpc_release_current_dsp_process(struct fastrpc_user * fl)1163 static int fastrpc_release_current_dsp_process(struct fastrpc_user *fl)
1164 {
1165 struct fastrpc_invoke_args args[1];
1166 int tgid = 0;
1167 u32 sc;
1168
1169 tgid = fl->tgid;
1170 args[0].ptr = (u64)(uintptr_t) &tgid;
1171 args[0].length = sizeof(tgid);
1172 args[0].fd = -1;
1173 args[0].reserved = 0;
1174 sc = FASTRPC_SCALARS(FASTRPC_RMID_INIT_RELEASE, 1, 0);
1175
1176 return fastrpc_internal_invoke(fl, true, FASTRPC_INIT_HANDLE,
1177 sc, &args[0]);
1178 }
1179
fastrpc_device_release(struct inode * inode,struct file * file)1180 static int fastrpc_device_release(struct inode *inode, struct file *file)
1181 {
1182 struct fastrpc_user *fl = (struct fastrpc_user *)file->private_data;
1183 struct fastrpc_channel_ctx *cctx = fl->cctx;
1184 struct fastrpc_invoke_ctx *ctx, *n;
1185 struct fastrpc_map *map, *m;
1186 struct fastrpc_buf *buf, *b;
1187 unsigned long flags;
1188
1189 fastrpc_release_current_dsp_process(fl);
1190
1191 spin_lock_irqsave(&cctx->lock, flags);
1192 list_del(&fl->user);
1193 spin_unlock_irqrestore(&cctx->lock, flags);
1194
1195 if (fl->init_mem)
1196 fastrpc_buf_free(fl->init_mem);
1197
1198 list_for_each_entry_safe(ctx, n, &fl->pending, node) {
1199 list_del(&ctx->node);
1200 fastrpc_context_put(ctx);
1201 }
1202
1203 list_for_each_entry_safe(map, m, &fl->maps, node)
1204 fastrpc_map_put(map);
1205
1206 list_for_each_entry_safe(buf, b, &fl->mmaps, node) {
1207 list_del(&buf->node);
1208 fastrpc_buf_free(buf);
1209 }
1210
1211 fastrpc_session_free(cctx, fl->sctx);
1212 fastrpc_channel_ctx_put(cctx);
1213
1214 mutex_destroy(&fl->mutex);
1215 kfree(fl);
1216 file->private_data = NULL;
1217
1218 return 0;
1219 }
1220
fastrpc_device_open(struct inode * inode,struct file * filp)1221 static int fastrpc_device_open(struct inode *inode, struct file *filp)
1222 {
1223 struct fastrpc_channel_ctx *cctx = miscdev_to_cctx(filp->private_data);
1224 struct fastrpc_user *fl = NULL;
1225 unsigned long flags;
1226
1227 fl = kzalloc(sizeof(*fl), GFP_KERNEL);
1228 if (!fl)
1229 return -ENOMEM;
1230
1231 /* Released in fastrpc_device_release() */
1232 fastrpc_channel_ctx_get(cctx);
1233
1234 filp->private_data = fl;
1235 spin_lock_init(&fl->lock);
1236 mutex_init(&fl->mutex);
1237 INIT_LIST_HEAD(&fl->pending);
1238 INIT_LIST_HEAD(&fl->maps);
1239 INIT_LIST_HEAD(&fl->mmaps);
1240 INIT_LIST_HEAD(&fl->user);
1241 fl->tgid = current->tgid;
1242 fl->cctx = cctx;
1243
1244 fl->sctx = fastrpc_session_alloc(cctx);
1245 if (!fl->sctx) {
1246 dev_err(&cctx->rpdev->dev, "No session available\n");
1247 mutex_destroy(&fl->mutex);
1248 kfree(fl);
1249
1250 return -EBUSY;
1251 }
1252
1253 spin_lock_irqsave(&cctx->lock, flags);
1254 list_add_tail(&fl->user, &cctx->users);
1255 spin_unlock_irqrestore(&cctx->lock, flags);
1256
1257 return 0;
1258 }
1259
fastrpc_dmabuf_alloc(struct fastrpc_user * fl,char __user * argp)1260 static int fastrpc_dmabuf_alloc(struct fastrpc_user *fl, char __user *argp)
1261 {
1262 struct fastrpc_alloc_dma_buf bp;
1263 DEFINE_DMA_BUF_EXPORT_INFO(exp_info);
1264 struct fastrpc_buf *buf = NULL;
1265 int err;
1266
1267 if (copy_from_user(&bp, argp, sizeof(bp)))
1268 return -EFAULT;
1269
1270 err = fastrpc_buf_alloc(fl, fl->sctx->dev, bp.size, &buf);
1271 if (err)
1272 return err;
1273 exp_info.ops = &fastrpc_dma_buf_ops;
1274 exp_info.size = bp.size;
1275 exp_info.flags = O_RDWR;
1276 exp_info.priv = buf;
1277 buf->dmabuf = dma_buf_export(&exp_info);
1278 if (IS_ERR(buf->dmabuf)) {
1279 err = PTR_ERR(buf->dmabuf);
1280 fastrpc_buf_free(buf);
1281 return err;
1282 }
1283
1284 bp.fd = dma_buf_fd(buf->dmabuf, O_ACCMODE);
1285 if (bp.fd < 0) {
1286 dma_buf_put(buf->dmabuf);
1287 return -EINVAL;
1288 }
1289
1290 if (copy_to_user(argp, &bp, sizeof(bp))) {
1291 /*
1292 * The usercopy failed, but we can't do much about it, as
1293 * dma_buf_fd() already called fd_install() and made the
1294 * file descriptor accessible for the current process. It
1295 * might already be closed and dmabuf no longer valid when
1296 * we reach this point. Therefore "leak" the fd and rely on
1297 * the process exit path to do any required cleanup.
1298 */
1299 return -EFAULT;
1300 }
1301
1302 return 0;
1303 }
1304
fastrpc_init_attach(struct fastrpc_user * fl,int pd)1305 static int fastrpc_init_attach(struct fastrpc_user *fl, int pd)
1306 {
1307 struct fastrpc_invoke_args args[1];
1308 int tgid = fl->tgid;
1309 u32 sc;
1310
1311 args[0].ptr = (u64)(uintptr_t) &tgid;
1312 args[0].length = sizeof(tgid);
1313 args[0].fd = -1;
1314 args[0].reserved = 0;
1315 sc = FASTRPC_SCALARS(FASTRPC_RMID_INIT_ATTACH, 1, 0);
1316 fl->pd = pd;
1317
1318 return fastrpc_internal_invoke(fl, true, FASTRPC_INIT_HANDLE,
1319 sc, &args[0]);
1320 }
1321
fastrpc_invoke(struct fastrpc_user * fl,char __user * argp)1322 static int fastrpc_invoke(struct fastrpc_user *fl, char __user *argp)
1323 {
1324 struct fastrpc_invoke_args *args = NULL;
1325 struct fastrpc_invoke inv;
1326 u32 nscalars;
1327 int err;
1328
1329 if (copy_from_user(&inv, argp, sizeof(inv)))
1330 return -EFAULT;
1331
1332 /* nscalars is truncated here to max supported value */
1333 nscalars = REMOTE_SCALARS_LENGTH(inv.sc);
1334 if (nscalars) {
1335 args = kcalloc(nscalars, sizeof(*args), GFP_KERNEL);
1336 if (!args)
1337 return -ENOMEM;
1338
1339 if (copy_from_user(args, (void __user *)(uintptr_t)inv.args,
1340 nscalars * sizeof(*args))) {
1341 kfree(args);
1342 return -EFAULT;
1343 }
1344 }
1345
1346 err = fastrpc_internal_invoke(fl, false, inv.handle, inv.sc, args);
1347 kfree(args);
1348
1349 return err;
1350 }
1351
fastrpc_req_munmap_impl(struct fastrpc_user * fl,struct fastrpc_req_munmap * req)1352 static int fastrpc_req_munmap_impl(struct fastrpc_user *fl,
1353 struct fastrpc_req_munmap *req)
1354 {
1355 struct fastrpc_invoke_args args[1] = { [0] = { 0 } };
1356 struct fastrpc_buf *buf = NULL, *iter, *b;
1357 struct fastrpc_munmap_req_msg req_msg;
1358 struct device *dev = fl->sctx->dev;
1359 int err;
1360 u32 sc;
1361
1362 spin_lock(&fl->lock);
1363 list_for_each_entry_safe(iter, b, &fl->mmaps, node) {
1364 if ((iter->raddr == req->vaddrout) && (iter->size == req->size)) {
1365 buf = iter;
1366 break;
1367 }
1368 }
1369 spin_unlock(&fl->lock);
1370
1371 if (!buf) {
1372 dev_err(dev, "mmap not in list\n");
1373 return -EINVAL;
1374 }
1375
1376 req_msg.pgid = fl->tgid;
1377 req_msg.size = buf->size;
1378 req_msg.vaddr = buf->raddr;
1379
1380 args[0].ptr = (u64) (uintptr_t) &req_msg;
1381 args[0].length = sizeof(req_msg);
1382
1383 sc = FASTRPC_SCALARS(FASTRPC_RMID_INIT_MUNMAP, 1, 0);
1384 err = fastrpc_internal_invoke(fl, true, FASTRPC_INIT_HANDLE, sc,
1385 &args[0]);
1386 if (!err) {
1387 dev_dbg(dev, "unmmap\tpt 0x%09lx OK\n", buf->raddr);
1388 spin_lock(&fl->lock);
1389 list_del(&buf->node);
1390 spin_unlock(&fl->lock);
1391 fastrpc_buf_free(buf);
1392 } else {
1393 dev_err(dev, "unmmap\tpt 0x%09lx ERROR\n", buf->raddr);
1394 }
1395
1396 return err;
1397 }
1398
fastrpc_req_munmap(struct fastrpc_user * fl,char __user * argp)1399 static int fastrpc_req_munmap(struct fastrpc_user *fl, char __user *argp)
1400 {
1401 struct fastrpc_req_munmap req;
1402
1403 if (copy_from_user(&req, argp, sizeof(req)))
1404 return -EFAULT;
1405
1406 return fastrpc_req_munmap_impl(fl, &req);
1407 }
1408
fastrpc_req_mmap(struct fastrpc_user * fl,char __user * argp)1409 static int fastrpc_req_mmap(struct fastrpc_user *fl, char __user *argp)
1410 {
1411 struct fastrpc_invoke_args args[3] = { [0 ... 2] = { 0 } };
1412 struct fastrpc_buf *buf = NULL;
1413 struct fastrpc_mmap_req_msg req_msg;
1414 struct fastrpc_mmap_rsp_msg rsp_msg;
1415 struct fastrpc_req_munmap req_unmap;
1416 struct fastrpc_phy_page pages;
1417 struct fastrpc_req_mmap req;
1418 struct device *dev = fl->sctx->dev;
1419 int err;
1420 u32 sc;
1421
1422 if (copy_from_user(&req, argp, sizeof(req)))
1423 return -EFAULT;
1424
1425 if (req.flags != ADSP_MMAP_ADD_PAGES) {
1426 dev_err(dev, "flag not supported 0x%x\n", req.flags);
1427 return -EINVAL;
1428 }
1429
1430 if (req.vaddrin) {
1431 dev_err(dev, "adding user allocated pages is not supported\n");
1432 return -EINVAL;
1433 }
1434
1435 err = fastrpc_buf_alloc(fl, fl->sctx->dev, req.size, &buf);
1436 if (err) {
1437 dev_err(dev, "failed to allocate buffer\n");
1438 return err;
1439 }
1440
1441 req_msg.pgid = fl->tgid;
1442 req_msg.flags = req.flags;
1443 req_msg.vaddr = req.vaddrin;
1444 req_msg.num = sizeof(pages);
1445
1446 args[0].ptr = (u64) (uintptr_t) &req_msg;
1447 args[0].length = sizeof(req_msg);
1448
1449 pages.addr = buf->phys;
1450 pages.size = buf->size;
1451
1452 args[1].ptr = (u64) (uintptr_t) &pages;
1453 args[1].length = sizeof(pages);
1454
1455 args[2].ptr = (u64) (uintptr_t) &rsp_msg;
1456 args[2].length = sizeof(rsp_msg);
1457
1458 sc = FASTRPC_SCALARS(FASTRPC_RMID_INIT_MMAP, 2, 1);
1459 err = fastrpc_internal_invoke(fl, true, FASTRPC_INIT_HANDLE, sc,
1460 &args[0]);
1461 if (err) {
1462 dev_err(dev, "mmap error (len 0x%08llx)\n", buf->size);
1463 goto err_invoke;
1464 }
1465
1466 /* update the buffer to be able to deallocate the memory on the DSP */
1467 buf->raddr = (uintptr_t) rsp_msg.vaddr;
1468
1469 /* let the client know the address to use */
1470 req.vaddrout = rsp_msg.vaddr;
1471
1472 spin_lock(&fl->lock);
1473 list_add_tail(&buf->node, &fl->mmaps);
1474 spin_unlock(&fl->lock);
1475
1476 if (copy_to_user((void __user *)argp, &req, sizeof(req))) {
1477 /* unmap the memory and release the buffer */
1478 req_unmap.vaddrout = buf->raddr;
1479 req_unmap.size = buf->size;
1480 fastrpc_req_munmap_impl(fl, &req_unmap);
1481 return -EFAULT;
1482 }
1483
1484 dev_dbg(dev, "mmap\t\tpt 0x%09lx OK [len 0x%08llx]\n",
1485 buf->raddr, buf->size);
1486
1487 return 0;
1488
1489 err_invoke:
1490 fastrpc_buf_free(buf);
1491
1492 return err;
1493 }
1494
fastrpc_device_ioctl(struct file * file,unsigned int cmd,unsigned long arg)1495 static long fastrpc_device_ioctl(struct file *file, unsigned int cmd,
1496 unsigned long arg)
1497 {
1498 struct fastrpc_user *fl = (struct fastrpc_user *)file->private_data;
1499 char __user *argp = (char __user *)arg;
1500 int err;
1501
1502 switch (cmd) {
1503 case FASTRPC_IOCTL_INVOKE:
1504 err = fastrpc_invoke(fl, argp);
1505 break;
1506 case FASTRPC_IOCTL_INIT_ATTACH:
1507 err = fastrpc_init_attach(fl, AUDIO_PD);
1508 break;
1509 case FASTRPC_IOCTL_INIT_ATTACH_SNS:
1510 err = fastrpc_init_attach(fl, SENSORS_PD);
1511 break;
1512 case FASTRPC_IOCTL_INIT_CREATE:
1513 err = fastrpc_init_create_process(fl, argp);
1514 break;
1515 case FASTRPC_IOCTL_ALLOC_DMA_BUFF:
1516 err = fastrpc_dmabuf_alloc(fl, argp);
1517 break;
1518 case FASTRPC_IOCTL_MMAP:
1519 err = fastrpc_req_mmap(fl, argp);
1520 break;
1521 case FASTRPC_IOCTL_MUNMAP:
1522 err = fastrpc_req_munmap(fl, argp);
1523 break;
1524 default:
1525 err = -ENOTTY;
1526 break;
1527 }
1528
1529 return err;
1530 }
1531
1532 static const struct file_operations fastrpc_fops = {
1533 .open = fastrpc_device_open,
1534 .release = fastrpc_device_release,
1535 .unlocked_ioctl = fastrpc_device_ioctl,
1536 .compat_ioctl = fastrpc_device_ioctl,
1537 };
1538
fastrpc_cb_probe(struct platform_device * pdev)1539 static int fastrpc_cb_probe(struct platform_device *pdev)
1540 {
1541 struct fastrpc_channel_ctx *cctx;
1542 struct fastrpc_session_ctx *sess;
1543 struct device *dev = &pdev->dev;
1544 int i, sessions = 0;
1545 unsigned long flags;
1546 int rc;
1547
1548 cctx = dev_get_drvdata(dev->parent);
1549 if (!cctx)
1550 return -EINVAL;
1551
1552 of_property_read_u32(dev->of_node, "qcom,nsessions", &sessions);
1553
1554 spin_lock_irqsave(&cctx->lock, flags);
1555 if (cctx->sesscount >= FASTRPC_MAX_SESSIONS) {
1556 dev_err(&pdev->dev, "too many sessions\n");
1557 spin_unlock_irqrestore(&cctx->lock, flags);
1558 return -ENOSPC;
1559 }
1560 sess = &cctx->session[cctx->sesscount++];
1561 sess->used = false;
1562 sess->valid = true;
1563 sess->dev = dev;
1564 dev_set_drvdata(dev, sess);
1565
1566 if (of_property_read_u32(dev->of_node, "reg", &sess->sid))
1567 dev_info(dev, "FastRPC Session ID not specified in DT\n");
1568
1569 if (sessions > 0) {
1570 struct fastrpc_session_ctx *dup_sess;
1571
1572 for (i = 1; i < sessions; i++) {
1573 if (cctx->sesscount >= FASTRPC_MAX_SESSIONS)
1574 break;
1575 dup_sess = &cctx->session[cctx->sesscount++];
1576 memcpy(dup_sess, sess, sizeof(*dup_sess));
1577 }
1578 }
1579 spin_unlock_irqrestore(&cctx->lock, flags);
1580 rc = dma_set_mask(dev, DMA_BIT_MASK(32));
1581 if (rc) {
1582 dev_err(dev, "32-bit DMA enable failed\n");
1583 return rc;
1584 }
1585
1586 return 0;
1587 }
1588
fastrpc_cb_remove(struct platform_device * pdev)1589 static int fastrpc_cb_remove(struct platform_device *pdev)
1590 {
1591 struct fastrpc_channel_ctx *cctx = dev_get_drvdata(pdev->dev.parent);
1592 struct fastrpc_session_ctx *sess = dev_get_drvdata(&pdev->dev);
1593 unsigned long flags;
1594 int i;
1595
1596 spin_lock_irqsave(&cctx->lock, flags);
1597 for (i = 0; i < FASTRPC_MAX_SESSIONS; i++) {
1598 if (cctx->session[i].sid == sess->sid) {
1599 cctx->session[i].valid = false;
1600 cctx->sesscount--;
1601 }
1602 }
1603 spin_unlock_irqrestore(&cctx->lock, flags);
1604
1605 return 0;
1606 }
1607
1608 static const struct of_device_id fastrpc_match_table[] = {
1609 { .compatible = "qcom,fastrpc-compute-cb", },
1610 {}
1611 };
1612
1613 static struct platform_driver fastrpc_cb_driver = {
1614 .probe = fastrpc_cb_probe,
1615 .remove = fastrpc_cb_remove,
1616 .driver = {
1617 .name = "qcom,fastrpc-cb",
1618 .of_match_table = fastrpc_match_table,
1619 .suppress_bind_attrs = true,
1620 },
1621 };
1622
fastrpc_rpmsg_probe(struct rpmsg_device * rpdev)1623 static int fastrpc_rpmsg_probe(struct rpmsg_device *rpdev)
1624 {
1625 struct device *rdev = &rpdev->dev;
1626 struct fastrpc_channel_ctx *data;
1627 int i, err, domain_id = -1;
1628 const char *domain;
1629
1630 err = of_property_read_string(rdev->of_node, "label", &domain);
1631 if (err) {
1632 dev_info(rdev, "FastRPC Domain not specified in DT\n");
1633 return err;
1634 }
1635
1636 for (i = 0; i <= CDSP_DOMAIN_ID; i++) {
1637 if (!strcmp(domains[i], domain)) {
1638 domain_id = i;
1639 break;
1640 }
1641 }
1642
1643 if (domain_id < 0) {
1644 dev_info(rdev, "FastRPC Invalid Domain ID %d\n", domain_id);
1645 return -EINVAL;
1646 }
1647
1648 data = kzalloc(sizeof(*data), GFP_KERNEL);
1649 if (!data)
1650 return -ENOMEM;
1651
1652 data->miscdev.minor = MISC_DYNAMIC_MINOR;
1653 data->miscdev.name = devm_kasprintf(rdev, GFP_KERNEL, "fastrpc-%s",
1654 domains[domain_id]);
1655 data->miscdev.fops = &fastrpc_fops;
1656 err = misc_register(&data->miscdev);
1657 if (err) {
1658 kfree(data);
1659 return err;
1660 }
1661
1662 kref_init(&data->refcount);
1663
1664 dev_set_drvdata(&rpdev->dev, data);
1665 dma_set_mask_and_coherent(rdev, DMA_BIT_MASK(32));
1666 INIT_LIST_HEAD(&data->users);
1667 spin_lock_init(&data->lock);
1668 idr_init(&data->ctx_idr);
1669 data->domain_id = domain_id;
1670 data->rpdev = rpdev;
1671
1672 return of_platform_populate(rdev->of_node, NULL, NULL, rdev);
1673 }
1674
fastrpc_notify_users(struct fastrpc_user * user)1675 static void fastrpc_notify_users(struct fastrpc_user *user)
1676 {
1677 struct fastrpc_invoke_ctx *ctx;
1678
1679 spin_lock(&user->lock);
1680 list_for_each_entry(ctx, &user->pending, node) {
1681 ctx->retval = -EPIPE;
1682 complete(&ctx->work);
1683 }
1684 spin_unlock(&user->lock);
1685 }
1686
fastrpc_rpmsg_remove(struct rpmsg_device * rpdev)1687 static void fastrpc_rpmsg_remove(struct rpmsg_device *rpdev)
1688 {
1689 struct fastrpc_channel_ctx *cctx = dev_get_drvdata(&rpdev->dev);
1690 struct fastrpc_user *user;
1691 unsigned long flags;
1692
1693 /* No invocations past this point */
1694 spin_lock_irqsave(&cctx->lock, flags);
1695 cctx->rpdev = NULL;
1696 list_for_each_entry(user, &cctx->users, user)
1697 fastrpc_notify_users(user);
1698 spin_unlock_irqrestore(&cctx->lock, flags);
1699
1700 misc_deregister(&cctx->miscdev);
1701 of_platform_depopulate(&rpdev->dev);
1702
1703 fastrpc_channel_ctx_put(cctx);
1704 }
1705
fastrpc_rpmsg_callback(struct rpmsg_device * rpdev,void * data,int len,void * priv,u32 addr)1706 static int fastrpc_rpmsg_callback(struct rpmsg_device *rpdev, void *data,
1707 int len, void *priv, u32 addr)
1708 {
1709 struct fastrpc_channel_ctx *cctx = dev_get_drvdata(&rpdev->dev);
1710 struct fastrpc_invoke_rsp *rsp = data;
1711 struct fastrpc_invoke_ctx *ctx;
1712 unsigned long flags;
1713 unsigned long ctxid;
1714
1715 if (len < sizeof(*rsp))
1716 return -EINVAL;
1717
1718 ctxid = ((rsp->ctx & FASTRPC_CTXID_MASK) >> 4);
1719
1720 spin_lock_irqsave(&cctx->lock, flags);
1721 ctx = idr_find(&cctx->ctx_idr, ctxid);
1722 spin_unlock_irqrestore(&cctx->lock, flags);
1723
1724 if (!ctx) {
1725 dev_err(&rpdev->dev, "No context ID matches response\n");
1726 return -ENOENT;
1727 }
1728
1729 ctx->retval = rsp->retval;
1730 complete(&ctx->work);
1731
1732 /*
1733 * The DMA buffer associated with the context cannot be freed in
1734 * interrupt context so schedule it through a worker thread to
1735 * avoid a kernel BUG.
1736 */
1737 schedule_work(&ctx->put_work);
1738
1739 return 0;
1740 }
1741
1742 static const struct of_device_id fastrpc_rpmsg_of_match[] = {
1743 { .compatible = "qcom,fastrpc" },
1744 { },
1745 };
1746 MODULE_DEVICE_TABLE(of, fastrpc_rpmsg_of_match);
1747
1748 static struct rpmsg_driver fastrpc_driver = {
1749 .probe = fastrpc_rpmsg_probe,
1750 .remove = fastrpc_rpmsg_remove,
1751 .callback = fastrpc_rpmsg_callback,
1752 .drv = {
1753 .name = "qcom,fastrpc",
1754 .of_match_table = fastrpc_rpmsg_of_match,
1755 },
1756 };
1757
fastrpc_init(void)1758 static int fastrpc_init(void)
1759 {
1760 int ret;
1761
1762 ret = platform_driver_register(&fastrpc_cb_driver);
1763 if (ret < 0) {
1764 pr_err("fastrpc: failed to register cb driver\n");
1765 return ret;
1766 }
1767
1768 ret = register_rpmsg_driver(&fastrpc_driver);
1769 if (ret < 0) {
1770 pr_err("fastrpc: failed to register rpmsg driver\n");
1771 platform_driver_unregister(&fastrpc_cb_driver);
1772 return ret;
1773 }
1774
1775 return 0;
1776 }
1777 module_init(fastrpc_init);
1778
fastrpc_exit(void)1779 static void fastrpc_exit(void)
1780 {
1781 platform_driver_unregister(&fastrpc_cb_driver);
1782 unregister_rpmsg_driver(&fastrpc_driver);
1783 }
1784 module_exit(fastrpc_exit);
1785
1786 MODULE_LICENSE("GPL v2");
1787