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