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f6f9279f SK |
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 | ||
c68cfb71 | 5 | #include <linux/completion.h> |
f6f9279f | 6 | #include <linux/device.h> |
c68cfb71 | 7 | #include <linux/dma-buf.h> |
f6f9279f SK |
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/of_platform.h> | |
16 | #include <linux/rpmsg.h> | |
17 | #include <linux/scatterlist.h> | |
18 | #include <linux/slab.h> | |
c68cfb71 | 19 | #include <uapi/misc/fastrpc.h> |
f6f9279f SK |
20 | |
21 | #define ADSP_DOMAIN_ID (0) | |
22 | #define MDSP_DOMAIN_ID (1) | |
23 | #define SDSP_DOMAIN_ID (2) | |
24 | #define CDSP_DOMAIN_ID (3) | |
25 | #define FASTRPC_DEV_MAX 4 /* adsp, mdsp, slpi, cdsp*/ | |
26 | #define FASTRPC_MAX_SESSIONS 9 /*8 compute, 1 cpz*/ | |
c68cfb71 SK |
27 | #define FASTRPC_ALIGN 128 |
28 | #define FASTRPC_MAX_FDLIST 16 | |
29 | #define FASTRPC_MAX_CRCLIST 64 | |
30 | #define FASTRPC_PHYS(p) ((p) & 0xffffffff) | |
f6f9279f SK |
31 | #define FASTRPC_CTX_MAX (256) |
32 | #define FASTRPC_CTXID_MASK (0xFF0) | |
33 | #define FASTRPC_DEVICE_NAME "fastrpc" | |
34 | ||
c68cfb71 SK |
35 | /* Retrives number of input buffers from the scalars parameter */ |
36 | #define REMOTE_SCALARS_INBUFS(sc) (((sc) >> 16) & 0x0ff) | |
37 | ||
38 | /* Retrives number of output buffers from the scalars parameter */ | |
39 | #define REMOTE_SCALARS_OUTBUFS(sc) (((sc) >> 8) & 0x0ff) | |
40 | ||
41 | /* Retrives number of input handles from the scalars parameter */ | |
42 | #define REMOTE_SCALARS_INHANDLES(sc) (((sc) >> 4) & 0x0f) | |
43 | ||
44 | /* Retrives number of output handles from the scalars parameter */ | |
45 | #define REMOTE_SCALARS_OUTHANDLES(sc) ((sc) & 0x0f) | |
46 | ||
47 | #define REMOTE_SCALARS_LENGTH(sc) (REMOTE_SCALARS_INBUFS(sc) + \ | |
48 | REMOTE_SCALARS_OUTBUFS(sc) + \ | |
49 | REMOTE_SCALARS_INHANDLES(sc)+ \ | |
50 | REMOTE_SCALARS_OUTHANDLES(sc)) | |
51 | #define FASTRPC_BUILD_SCALARS(attr, method, in, out, oin, oout) \ | |
52 | (((attr & 0x07) << 29) | \ | |
53 | ((method & 0x1f) << 24) | \ | |
54 | ((in & 0xff) << 16) | \ | |
55 | ((out & 0xff) << 8) | \ | |
56 | ((oin & 0x0f) << 4) | \ | |
57 | (oout & 0x0f)) | |
58 | ||
59 | #define FASTRPC_SCALARS(method, in, out) \ | |
60 | FASTRPC_BUILD_SCALARS(0, method, in, out, 0, 0) | |
61 | ||
f6f9279f SK |
62 | #define miscdev_to_cctx(d) container_of(d, struct fastrpc_channel_ctx, miscdev) |
63 | ||
64 | static const char *domains[FASTRPC_DEV_MAX] = { "adsp", "mdsp", | |
65 | "sdsp", "cdsp"}; | |
c68cfb71 SK |
66 | struct fastrpc_phy_page { |
67 | u64 addr; /* physical address */ | |
68 | u64 size; /* size of contiguous region */ | |
69 | }; | |
70 | ||
71 | struct fastrpc_invoke_buf { | |
72 | u32 num; /* number of contiguous regions */ | |
73 | u32 pgidx; /* index to start of contiguous region */ | |
74 | }; | |
75 | ||
76 | struct fastrpc_remote_arg { | |
77 | u64 pv; | |
78 | u64 len; | |
79 | }; | |
80 | ||
81 | struct fastrpc_msg { | |
82 | int pid; /* process group id */ | |
83 | int tid; /* thread id */ | |
84 | u64 ctx; /* invoke caller context */ | |
85 | u32 handle; /* handle to invoke */ | |
86 | u32 sc; /* scalars structure describing the data */ | |
87 | u64 addr; /* physical address */ | |
88 | u64 size; /* size of contiguous region */ | |
89 | }; | |
90 | ||
91 | struct fastrpc_invoke_rsp { | |
92 | u64 ctx; /* invoke caller context */ | |
93 | int retval; /* invoke return value */ | |
94 | }; | |
95 | ||
96 | struct fastrpc_buf { | |
97 | struct fastrpc_user *fl; | |
98 | struct device *dev; | |
99 | void *virt; | |
100 | u64 phys; | |
101 | u64 size; | |
102 | }; | |
103 | ||
104 | struct fastrpc_map { | |
105 | struct list_head node; | |
106 | struct fastrpc_user *fl; | |
107 | int fd; | |
108 | struct dma_buf *buf; | |
109 | struct sg_table *table; | |
110 | struct dma_buf_attachment *attach; | |
111 | u64 phys; | |
112 | u64 size; | |
113 | void *va; | |
114 | u64 len; | |
115 | struct kref refcount; | |
116 | }; | |
117 | ||
118 | struct fastrpc_invoke_ctx { | |
119 | int nscalars; | |
120 | int nbufs; | |
121 | int retval; | |
122 | int pid; | |
123 | int tgid; | |
124 | u32 sc; | |
125 | u32 *crc; | |
126 | u64 ctxid; | |
127 | u64 msg_sz; | |
128 | struct kref refcount; | |
129 | struct list_head node; /* list of ctxs */ | |
130 | struct completion work; | |
131 | struct fastrpc_msg msg; | |
132 | struct fastrpc_user *fl; | |
133 | struct fastrpc_remote_arg *rpra; | |
134 | struct fastrpc_map **maps; | |
135 | struct fastrpc_buf *buf; | |
136 | struct fastrpc_invoke_args *args; | |
137 | struct fastrpc_channel_ctx *cctx; | |
138 | }; | |
f6f9279f SK |
139 | |
140 | struct fastrpc_session_ctx { | |
141 | struct device *dev; | |
142 | int sid; | |
143 | bool used; | |
144 | bool valid; | |
145 | }; | |
146 | ||
147 | struct fastrpc_channel_ctx { | |
148 | int domain_id; | |
149 | int sesscount; | |
150 | struct rpmsg_device *rpdev; | |
151 | struct fastrpc_session_ctx session[FASTRPC_MAX_SESSIONS]; | |
152 | spinlock_t lock; | |
153 | struct idr ctx_idr; | |
154 | struct list_head users; | |
155 | struct miscdevice miscdev; | |
156 | }; | |
157 | ||
158 | struct fastrpc_user { | |
159 | struct list_head user; | |
160 | struct list_head maps; | |
161 | struct list_head pending; | |
162 | ||
163 | struct fastrpc_channel_ctx *cctx; | |
164 | struct fastrpc_session_ctx *sctx; | |
c68cfb71 | 165 | struct fastrpc_buf *init_mem; |
f6f9279f SK |
166 | |
167 | int tgid; | |
168 | int pd; | |
169 | /* Lock for lists */ | |
170 | spinlock_t lock; | |
171 | /* lock for allocations */ | |
172 | struct mutex mutex; | |
173 | }; | |
174 | ||
c68cfb71 SK |
175 | static void fastrpc_free_map(struct kref *ref) |
176 | { | |
177 | struct fastrpc_map *map; | |
178 | ||
179 | map = container_of(ref, struct fastrpc_map, refcount); | |
180 | ||
181 | if (map->table) { | |
182 | dma_buf_unmap_attachment(map->attach, map->table, | |
183 | DMA_BIDIRECTIONAL); | |
184 | dma_buf_detach(map->buf, map->attach); | |
185 | dma_buf_put(map->buf); | |
186 | } | |
187 | ||
188 | kfree(map); | |
189 | } | |
190 | ||
191 | static void fastrpc_map_put(struct fastrpc_map *map) | |
192 | { | |
193 | if (map) | |
194 | kref_put(&map->refcount, fastrpc_free_map); | |
195 | } | |
196 | ||
197 | static void fastrpc_map_get(struct fastrpc_map *map) | |
198 | { | |
199 | if (map) | |
200 | kref_get(&map->refcount); | |
201 | } | |
202 | ||
203 | static int fastrpc_map_find(struct fastrpc_user *fl, int fd, | |
204 | struct fastrpc_map **ppmap) | |
205 | { | |
206 | struct fastrpc_map *map = NULL; | |
207 | ||
208 | mutex_lock(&fl->mutex); | |
209 | list_for_each_entry(map, &fl->maps, node) { | |
210 | if (map->fd == fd) { | |
211 | fastrpc_map_get(map); | |
212 | *ppmap = map; | |
213 | mutex_unlock(&fl->mutex); | |
214 | return 0; | |
215 | } | |
216 | } | |
217 | mutex_unlock(&fl->mutex); | |
218 | ||
219 | return -ENOENT; | |
220 | } | |
221 | ||
222 | static void fastrpc_buf_free(struct fastrpc_buf *buf) | |
223 | { | |
224 | dma_free_coherent(buf->dev, buf->size, buf->virt, | |
225 | FASTRPC_PHYS(buf->phys)); | |
226 | kfree(buf); | |
227 | } | |
228 | ||
229 | static int fastrpc_buf_alloc(struct fastrpc_user *fl, struct device *dev, | |
230 | u64 size, struct fastrpc_buf **obuf) | |
231 | { | |
232 | struct fastrpc_buf *buf; | |
233 | ||
234 | buf = kzalloc(sizeof(*buf), GFP_KERNEL); | |
235 | if (!buf) | |
236 | return -ENOMEM; | |
237 | ||
238 | buf->fl = fl; | |
239 | buf->virt = NULL; | |
240 | buf->phys = 0; | |
241 | buf->size = size; | |
242 | buf->dev = dev; | |
243 | ||
244 | buf->virt = dma_alloc_coherent(dev, buf->size, (dma_addr_t *)&buf->phys, | |
245 | GFP_KERNEL); | |
246 | if (!buf->virt) | |
247 | return -ENOMEM; | |
248 | ||
249 | if (fl->sctx && fl->sctx->sid) | |
250 | buf->phys += ((u64)fl->sctx->sid << 32); | |
251 | ||
252 | *obuf = buf; | |
253 | ||
254 | return 0; | |
255 | } | |
256 | ||
257 | static void fastrpc_context_free(struct kref *ref) | |
258 | { | |
259 | struct fastrpc_invoke_ctx *ctx; | |
260 | struct fastrpc_channel_ctx *cctx; | |
261 | int i; | |
262 | ||
263 | ctx = container_of(ref, struct fastrpc_invoke_ctx, refcount); | |
264 | cctx = ctx->cctx; | |
265 | ||
266 | for (i = 0; i < ctx->nscalars; i++) | |
267 | fastrpc_map_put(ctx->maps[i]); | |
268 | ||
269 | if (ctx->buf) | |
270 | fastrpc_buf_free(ctx->buf); | |
271 | ||
272 | spin_lock(&cctx->lock); | |
273 | idr_remove(&cctx->ctx_idr, ctx->ctxid >> 4); | |
274 | spin_unlock(&cctx->lock); | |
275 | ||
276 | kfree(ctx->maps); | |
277 | kfree(ctx); | |
278 | } | |
279 | ||
280 | static void fastrpc_context_get(struct fastrpc_invoke_ctx *ctx) | |
281 | { | |
282 | kref_get(&ctx->refcount); | |
283 | } | |
284 | ||
285 | static void fastrpc_context_put(struct fastrpc_invoke_ctx *ctx) | |
286 | { | |
287 | kref_put(&ctx->refcount, fastrpc_context_free); | |
288 | } | |
289 | ||
290 | static struct fastrpc_invoke_ctx *fastrpc_context_alloc( | |
291 | struct fastrpc_user *user, u32 kernel, u32 sc, | |
292 | struct fastrpc_invoke_args *args) | |
293 | { | |
294 | struct fastrpc_channel_ctx *cctx = user->cctx; | |
295 | struct fastrpc_invoke_ctx *ctx = NULL; | |
296 | int ret; | |
297 | ||
298 | ctx = kzalloc(sizeof(*ctx), GFP_KERNEL); | |
299 | if (!ctx) | |
300 | return ERR_PTR(-ENOMEM); | |
301 | ||
302 | INIT_LIST_HEAD(&ctx->node); | |
303 | ctx->fl = user; | |
304 | ctx->nscalars = REMOTE_SCALARS_LENGTH(sc); | |
305 | ctx->nbufs = REMOTE_SCALARS_INBUFS(sc) + | |
306 | REMOTE_SCALARS_OUTBUFS(sc); | |
307 | ||
308 | if (ctx->nscalars) { | |
309 | ctx->maps = kcalloc(ctx->nscalars, | |
310 | sizeof(*ctx->maps), GFP_KERNEL); | |
311 | if (!ctx->maps) { | |
312 | kfree(ctx); | |
313 | return ERR_PTR(-ENOMEM); | |
314 | } | |
315 | ctx->args = args; | |
316 | } | |
317 | ||
318 | ctx->sc = sc; | |
319 | ctx->retval = -1; | |
320 | ctx->pid = current->pid; | |
321 | ctx->tgid = user->tgid; | |
322 | ctx->cctx = cctx; | |
323 | init_completion(&ctx->work); | |
324 | ||
325 | spin_lock(&user->lock); | |
326 | list_add_tail(&ctx->node, &user->pending); | |
327 | spin_unlock(&user->lock); | |
328 | ||
329 | spin_lock(&cctx->lock); | |
330 | ret = idr_alloc_cyclic(&cctx->ctx_idr, ctx, 1, | |
331 | FASTRPC_CTX_MAX, GFP_ATOMIC); | |
332 | if (ret < 0) { | |
333 | spin_unlock(&cctx->lock); | |
334 | goto err_idr; | |
335 | } | |
336 | ctx->ctxid = ret << 4; | |
337 | spin_unlock(&cctx->lock); | |
338 | ||
339 | kref_init(&ctx->refcount); | |
340 | ||
341 | return ctx; | |
342 | err_idr: | |
343 | spin_lock(&user->lock); | |
344 | list_del(&ctx->node); | |
345 | spin_unlock(&user->lock); | |
346 | kfree(ctx->maps); | |
347 | kfree(ctx); | |
348 | ||
349 | return ERR_PTR(ret); | |
350 | } | |
351 | ||
352 | static int fastrpc_map_create(struct fastrpc_user *fl, int fd, | |
353 | u64 len, struct fastrpc_map **ppmap) | |
354 | { | |
355 | struct fastrpc_session_ctx *sess = fl->sctx; | |
356 | struct fastrpc_map *map = NULL; | |
357 | int err = 0; | |
358 | ||
359 | if (!fastrpc_map_find(fl, fd, ppmap)) | |
360 | return 0; | |
361 | ||
362 | map = kzalloc(sizeof(*map), GFP_KERNEL); | |
363 | if (!map) | |
364 | return -ENOMEM; | |
365 | ||
366 | INIT_LIST_HEAD(&map->node); | |
367 | map->fl = fl; | |
368 | map->fd = fd; | |
369 | map->buf = dma_buf_get(fd); | |
370 | if (!map->buf) { | |
371 | err = -EINVAL; | |
372 | goto get_err; | |
373 | } | |
374 | ||
375 | map->attach = dma_buf_attach(map->buf, sess->dev); | |
376 | if (IS_ERR(map->attach)) { | |
377 | dev_err(sess->dev, "Failed to attach dmabuf\n"); | |
378 | err = PTR_ERR(map->attach); | |
379 | goto attach_err; | |
380 | } | |
381 | ||
382 | map->table = dma_buf_map_attachment(map->attach, DMA_BIDIRECTIONAL); | |
383 | if (IS_ERR(map->table)) { | |
384 | err = PTR_ERR(map->table); | |
385 | goto map_err; | |
386 | } | |
387 | ||
388 | map->phys = sg_dma_address(map->table->sgl); | |
389 | map->phys += ((u64)fl->sctx->sid << 32); | |
390 | map->size = len; | |
391 | map->va = sg_virt(map->table->sgl); | |
392 | map->len = len; | |
393 | kref_init(&map->refcount); | |
394 | ||
395 | spin_lock(&fl->lock); | |
396 | list_add_tail(&map->node, &fl->maps); | |
397 | spin_unlock(&fl->lock); | |
398 | *ppmap = map; | |
399 | ||
400 | return 0; | |
401 | ||
402 | map_err: | |
403 | dma_buf_detach(map->buf, map->attach); | |
404 | attach_err: | |
405 | dma_buf_put(map->buf); | |
406 | get_err: | |
407 | kfree(map); | |
408 | ||
409 | return err; | |
410 | } | |
411 | ||
412 | /* | |
413 | * Fastrpc payload buffer with metadata looks like: | |
414 | * | |
415 | * >>>>>> START of METADATA <<<<<<<<< | |
416 | * +---------------------------------+ | |
417 | * | Arguments | | |
418 | * | type:(struct fastrpc_remote_arg)| | |
419 | * | (0 - N) | | |
420 | * +---------------------------------+ | |
421 | * | Invoke Buffer list | | |
422 | * | type:(struct fastrpc_invoke_buf)| | |
423 | * | (0 - N) | | |
424 | * +---------------------------------+ | |
425 | * | Page info list | | |
426 | * | type:(struct fastrpc_phy_page) | | |
427 | * | (0 - N) | | |
428 | * +---------------------------------+ | |
429 | * | Optional info | | |
430 | * |(can be specific to SoC/Firmware)| | |
431 | * +---------------------------------+ | |
432 | * >>>>>>>> END of METADATA <<<<<<<<< | |
433 | * +---------------------------------+ | |
434 | * | Inline ARGS | | |
435 | * | (0-N) | | |
436 | * +---------------------------------+ | |
437 | */ | |
438 | ||
439 | static int fastrpc_get_meta_size(struct fastrpc_invoke_ctx *ctx) | |
440 | { | |
441 | int size = 0; | |
442 | ||
443 | size = (sizeof(struct fastrpc_remote_arg) + | |
444 | sizeof(struct fastrpc_invoke_buf) + | |
445 | sizeof(struct fastrpc_phy_page)) * ctx->nscalars + | |
446 | sizeof(u64) * FASTRPC_MAX_FDLIST + | |
447 | sizeof(u32) * FASTRPC_MAX_CRCLIST; | |
448 | ||
449 | return size; | |
450 | } | |
451 | ||
452 | static u64 fastrpc_get_payload_size(struct fastrpc_invoke_ctx *ctx, int metalen) | |
453 | { | |
454 | u64 size = 0; | |
455 | int i; | |
456 | ||
457 | size = ALIGN(metalen, FASTRPC_ALIGN); | |
458 | for (i = 0; i < ctx->nscalars; i++) { | |
459 | if (ctx->args[i].fd == 0 || ctx->args[i].fd == -1) { | |
460 | size = ALIGN(size, FASTRPC_ALIGN); | |
461 | size += ctx->args[i].length; | |
462 | } | |
463 | } | |
464 | ||
465 | return size; | |
466 | } | |
467 | ||
468 | static int fastrpc_create_maps(struct fastrpc_invoke_ctx *ctx) | |
469 | { | |
470 | struct device *dev = ctx->fl->sctx->dev; | |
471 | int i, err; | |
472 | ||
473 | for (i = 0; i < ctx->nscalars; ++i) { | |
474 | /* Make sure reserved field is set to 0 */ | |
475 | if (ctx->args[i].reserved) | |
476 | return -EINVAL; | |
477 | ||
478 | if (ctx->args[i].fd == 0 || ctx->args[i].fd == -1 || | |
479 | ctx->args[i].length == 0) | |
480 | continue; | |
481 | ||
482 | err = fastrpc_map_create(ctx->fl, ctx->args[i].fd, | |
483 | ctx->args[i].length, &ctx->maps[i]); | |
484 | if (err) { | |
485 | dev_err(dev, "Error Creating map %d\n", err); | |
486 | return -EINVAL; | |
487 | } | |
488 | ||
489 | } | |
490 | return 0; | |
491 | } | |
492 | ||
493 | static int fastrpc_get_args(u32 kernel, struct fastrpc_invoke_ctx *ctx) | |
494 | { | |
495 | struct device *dev = ctx->fl->sctx->dev; | |
496 | struct fastrpc_remote_arg *rpra; | |
497 | struct fastrpc_invoke_buf *list; | |
498 | struct fastrpc_phy_page *pages; | |
499 | int inbufs, i, err = 0; | |
500 | u64 rlen, pkt_size; | |
501 | uintptr_t args; | |
502 | int metalen; | |
503 | ||
504 | ||
505 | inbufs = REMOTE_SCALARS_INBUFS(ctx->sc); | |
506 | metalen = fastrpc_get_meta_size(ctx); | |
507 | pkt_size = fastrpc_get_payload_size(ctx, metalen); | |
508 | ||
509 | err = fastrpc_create_maps(ctx); | |
510 | if (err) | |
511 | return err; | |
512 | ||
513 | ctx->msg_sz = pkt_size; | |
514 | ||
515 | err = fastrpc_buf_alloc(ctx->fl, dev, pkt_size, &ctx->buf); | |
516 | if (err) | |
517 | return err; | |
518 | ||
519 | rpra = ctx->buf->virt; | |
520 | list = ctx->buf->virt + ctx->nscalars * sizeof(*rpra); | |
521 | pages = ctx->buf->virt + ctx->nscalars * (sizeof(*list) + | |
522 | sizeof(*rpra)); | |
523 | args = (uintptr_t)ctx->buf->virt + metalen; | |
524 | rlen = pkt_size - metalen; | |
525 | ctx->rpra = rpra; | |
526 | ||
527 | for (i = 0; i < ctx->nbufs; ++i) { | |
528 | u64 len = ctx->args[i].length; | |
529 | ||
530 | rpra[i].pv = 0; | |
531 | rpra[i].len = len; | |
532 | list[i].num = len ? 1 : 0; | |
533 | list[i].pgidx = i; | |
534 | ||
535 | if (!len) | |
536 | continue; | |
537 | ||
538 | pages[i].size = roundup(len, PAGE_SIZE); | |
539 | ||
540 | if (ctx->maps[i]) { | |
541 | rpra[i].pv = (u64) ctx->args[i].ptr; | |
542 | pages[i].addr = ctx->maps[i]->phys; | |
543 | } else { | |
544 | rlen -= ALIGN(args, FASTRPC_ALIGN) - args; | |
545 | args = ALIGN(args, FASTRPC_ALIGN); | |
546 | if (rlen < len) | |
547 | goto bail; | |
548 | ||
549 | rpra[i].pv = args; | |
550 | pages[i].addr = ctx->buf->phys + (pkt_size - rlen); | |
551 | pages[i].addr = pages[i].addr & PAGE_MASK; | |
552 | args = args + len; | |
553 | rlen -= len; | |
554 | } | |
555 | ||
556 | if (i < inbufs && !ctx->maps[i]) { | |
557 | void *dst = (void *)(uintptr_t)rpra[i].pv; | |
558 | void *src = (void *)(uintptr_t)ctx->args[i].ptr; | |
559 | ||
560 | if (!kernel) { | |
561 | if (copy_from_user(dst, (void __user *)src, | |
562 | len)) { | |
563 | err = -EFAULT; | |
564 | goto bail; | |
565 | } | |
566 | } else { | |
567 | memcpy(dst, src, len); | |
568 | } | |
569 | } | |
570 | } | |
571 | ||
572 | for (i = ctx->nbufs; i < ctx->nscalars; ++i) { | |
573 | rpra[i].pv = (u64) ctx->args[i].ptr; | |
574 | rpra[i].len = ctx->args[i].length; | |
575 | list[i].num = ctx->args[i].length ? 1 : 0; | |
576 | list[i].pgidx = i; | |
577 | pages[i].addr = ctx->maps[i]->phys; | |
578 | pages[i].size = ctx->maps[i]->size; | |
579 | } | |
580 | ||
581 | bail: | |
582 | if (err) | |
583 | dev_err(dev, "Error: get invoke args failed:%d\n", err); | |
584 | ||
585 | return err; | |
586 | } | |
587 | ||
588 | static int fastrpc_put_args(struct fastrpc_invoke_ctx *ctx, | |
589 | u32 kernel) | |
590 | { | |
591 | struct fastrpc_remote_arg *rpra = ctx->rpra; | |
592 | int i, inbufs; | |
593 | ||
594 | inbufs = REMOTE_SCALARS_INBUFS(ctx->sc); | |
595 | ||
596 | for (i = inbufs; i < ctx->nbufs; ++i) { | |
597 | void *src = (void *)(uintptr_t)rpra[i].pv; | |
598 | void *dst = (void *)(uintptr_t)ctx->args[i].ptr; | |
599 | u64 len = rpra[i].len; | |
600 | ||
601 | if (!kernel) { | |
602 | if (copy_to_user((void __user *)dst, src, len)) | |
603 | return -EFAULT; | |
604 | } else { | |
605 | memcpy(dst, src, len); | |
606 | } | |
607 | } | |
608 | ||
609 | return 0; | |
610 | } | |
611 | ||
612 | static int fastrpc_invoke_send(struct fastrpc_session_ctx *sctx, | |
613 | struct fastrpc_invoke_ctx *ctx, | |
614 | u32 kernel, uint32_t handle) | |
615 | { | |
616 | struct fastrpc_channel_ctx *cctx; | |
617 | struct fastrpc_user *fl = ctx->fl; | |
618 | struct fastrpc_msg *msg = &ctx->msg; | |
619 | ||
620 | cctx = fl->cctx; | |
621 | msg->pid = fl->tgid; | |
622 | msg->tid = current->pid; | |
623 | ||
624 | if (kernel) | |
625 | msg->pid = 0; | |
626 | ||
627 | msg->ctx = ctx->ctxid | fl->pd; | |
628 | msg->handle = handle; | |
629 | msg->sc = ctx->sc; | |
630 | msg->addr = ctx->buf ? ctx->buf->phys : 0; | |
631 | msg->size = roundup(ctx->msg_sz, PAGE_SIZE); | |
632 | fastrpc_context_get(ctx); | |
633 | ||
634 | return rpmsg_send(cctx->rpdev->ept, (void *)msg, sizeof(*msg)); | |
635 | } | |
636 | ||
637 | static int fastrpc_internal_invoke(struct fastrpc_user *fl, u32 kernel, | |
638 | u32 handle, u32 sc, | |
639 | struct fastrpc_invoke_args *args) | |
640 | { | |
641 | struct fastrpc_invoke_ctx *ctx = NULL; | |
642 | int err = 0; | |
643 | ||
644 | if (!fl->sctx) | |
645 | return -EINVAL; | |
646 | ||
647 | ctx = fastrpc_context_alloc(fl, kernel, sc, args); | |
648 | if (IS_ERR(ctx)) | |
649 | return PTR_ERR(ctx); | |
650 | ||
651 | if (ctx->nscalars) { | |
652 | err = fastrpc_get_args(kernel, ctx); | |
653 | if (err) | |
654 | goto bail; | |
655 | } | |
656 | /* Send invoke buffer to remote dsp */ | |
657 | err = fastrpc_invoke_send(fl->sctx, ctx, kernel, handle); | |
658 | if (err) | |
659 | goto bail; | |
660 | ||
661 | /* Wait for remote dsp to respond or time out */ | |
662 | err = wait_for_completion_interruptible(&ctx->work); | |
663 | if (err) | |
664 | goto bail; | |
665 | ||
666 | /* Check the response from remote dsp */ | |
667 | err = ctx->retval; | |
668 | if (err) | |
669 | goto bail; | |
670 | ||
671 | if (ctx->nscalars) { | |
672 | /* populate all the output buffers with results */ | |
673 | err = fastrpc_put_args(ctx, kernel); | |
674 | if (err) | |
675 | goto bail; | |
676 | } | |
677 | ||
678 | bail: | |
679 | /* We are done with this compute context, remove it from pending list */ | |
680 | spin_lock(&fl->lock); | |
681 | list_del(&ctx->node); | |
682 | spin_unlock(&fl->lock); | |
683 | fastrpc_context_put(ctx); | |
684 | ||
685 | if (err) | |
686 | dev_dbg(fl->sctx->dev, "Error: Invoke Failed %d\n", err); | |
687 | ||
688 | return err; | |
689 | } | |
690 | ||
f6f9279f SK |
691 | static struct fastrpc_session_ctx *fastrpc_session_alloc( |
692 | struct fastrpc_channel_ctx *cctx) | |
693 | { | |
694 | struct fastrpc_session_ctx *session = NULL; | |
695 | int i; | |
696 | ||
697 | spin_lock(&cctx->lock); | |
698 | for (i = 0; i < cctx->sesscount; i++) { | |
699 | if (!cctx->session[i].used && cctx->session[i].valid) { | |
700 | cctx->session[i].used = true; | |
701 | session = &cctx->session[i]; | |
702 | break; | |
703 | } | |
704 | } | |
705 | spin_unlock(&cctx->lock); | |
706 | ||
707 | return session; | |
708 | } | |
709 | ||
710 | static void fastrpc_session_free(struct fastrpc_channel_ctx *cctx, | |
711 | struct fastrpc_session_ctx *session) | |
712 | { | |
713 | spin_lock(&cctx->lock); | |
714 | session->used = false; | |
715 | spin_unlock(&cctx->lock); | |
716 | } | |
717 | ||
718 | static int fastrpc_device_release(struct inode *inode, struct file *file) | |
719 | { | |
720 | struct fastrpc_user *fl = (struct fastrpc_user *)file->private_data; | |
721 | struct fastrpc_channel_ctx *cctx = fl->cctx; | |
c68cfb71 SK |
722 | struct fastrpc_invoke_ctx *ctx, *n; |
723 | struct fastrpc_map *map, *m; | |
f6f9279f SK |
724 | |
725 | spin_lock(&cctx->lock); | |
726 | list_del(&fl->user); | |
727 | spin_unlock(&cctx->lock); | |
728 | ||
c68cfb71 SK |
729 | if (fl->init_mem) |
730 | fastrpc_buf_free(fl->init_mem); | |
731 | ||
732 | list_for_each_entry_safe(ctx, n, &fl->pending, node) { | |
733 | list_del(&ctx->node); | |
734 | fastrpc_context_put(ctx); | |
735 | } | |
736 | ||
737 | list_for_each_entry_safe(map, m, &fl->maps, node) { | |
738 | list_del(&map->node); | |
739 | fastrpc_map_put(map); | |
740 | } | |
741 | ||
f6f9279f SK |
742 | fastrpc_session_free(cctx, fl->sctx); |
743 | ||
744 | mutex_destroy(&fl->mutex); | |
745 | kfree(fl); | |
746 | file->private_data = NULL; | |
747 | ||
748 | return 0; | |
749 | } | |
750 | ||
751 | static int fastrpc_device_open(struct inode *inode, struct file *filp) | |
752 | { | |
753 | struct fastrpc_channel_ctx *cctx = miscdev_to_cctx(filp->private_data); | |
754 | struct fastrpc_user *fl = NULL; | |
755 | ||
756 | fl = kzalloc(sizeof(*fl), GFP_KERNEL); | |
757 | if (!fl) | |
758 | return -ENOMEM; | |
759 | ||
760 | filp->private_data = fl; | |
761 | spin_lock_init(&fl->lock); | |
762 | mutex_init(&fl->mutex); | |
763 | INIT_LIST_HEAD(&fl->pending); | |
764 | INIT_LIST_HEAD(&fl->maps); | |
765 | INIT_LIST_HEAD(&fl->user); | |
766 | fl->tgid = current->tgid; | |
767 | fl->cctx = cctx; | |
768 | spin_lock(&cctx->lock); | |
769 | list_add_tail(&fl->user, &cctx->users); | |
770 | spin_unlock(&cctx->lock); | |
771 | fl->sctx = fastrpc_session_alloc(cctx); | |
772 | ||
773 | return 0; | |
774 | } | |
775 | ||
c68cfb71 SK |
776 | static int fastrpc_invoke(struct fastrpc_user *fl, char __user *argp) |
777 | { | |
778 | struct fastrpc_invoke_args *args = NULL; | |
779 | struct fastrpc_invoke inv; | |
780 | u32 nscalars; | |
781 | int err; | |
782 | ||
783 | if (copy_from_user(&inv, argp, sizeof(inv))) | |
784 | return -EFAULT; | |
785 | ||
786 | /* nscalars is truncated here to max supported value */ | |
787 | nscalars = REMOTE_SCALARS_LENGTH(inv.sc); | |
788 | if (nscalars) { | |
789 | args = kcalloc(nscalars, sizeof(*args), GFP_KERNEL); | |
790 | if (!args) | |
791 | return -ENOMEM; | |
792 | ||
793 | if (copy_from_user(args, (void __user *)(uintptr_t)inv.args, | |
794 | nscalars * sizeof(*args))) { | |
795 | kfree(args); | |
796 | return -EFAULT; | |
797 | } | |
798 | } | |
799 | ||
800 | err = fastrpc_internal_invoke(fl, false, inv.handle, inv.sc, args); | |
801 | kfree(args); | |
802 | ||
803 | return err; | |
804 | } | |
805 | ||
806 | static long fastrpc_device_ioctl(struct file *file, unsigned int cmd, | |
807 | unsigned long arg) | |
808 | { | |
809 | struct fastrpc_user *fl = (struct fastrpc_user *)file->private_data; | |
810 | char __user *argp = (char __user *)arg; | |
811 | int err; | |
812 | ||
813 | switch (cmd) { | |
814 | case FASTRPC_IOCTL_INVOKE: | |
815 | err = fastrpc_invoke(fl, argp); | |
816 | break; | |
817 | default: | |
818 | err = -ENOTTY; | |
819 | break; | |
820 | } | |
821 | ||
822 | return err; | |
823 | } | |
824 | ||
f6f9279f SK |
825 | static const struct file_operations fastrpc_fops = { |
826 | .open = fastrpc_device_open, | |
827 | .release = fastrpc_device_release, | |
c68cfb71 SK |
828 | .unlocked_ioctl = fastrpc_device_ioctl, |
829 | .compat_ioctl = fastrpc_device_ioctl, | |
f6f9279f SK |
830 | }; |
831 | ||
832 | static int fastrpc_cb_probe(struct platform_device *pdev) | |
833 | { | |
834 | struct fastrpc_channel_ctx *cctx; | |
835 | struct fastrpc_session_ctx *sess; | |
836 | struct device *dev = &pdev->dev; | |
837 | int i, sessions = 0; | |
838 | ||
839 | cctx = dev_get_drvdata(dev->parent); | |
840 | if (!cctx) | |
841 | return -EINVAL; | |
842 | ||
843 | of_property_read_u32(dev->of_node, "qcom,nsessions", &sessions); | |
844 | ||
845 | spin_lock(&cctx->lock); | |
846 | sess = &cctx->session[cctx->sesscount]; | |
847 | sess->used = false; | |
848 | sess->valid = true; | |
849 | sess->dev = dev; | |
850 | dev_set_drvdata(dev, sess); | |
851 | ||
852 | if (of_property_read_u32(dev->of_node, "reg", &sess->sid)) | |
853 | dev_info(dev, "FastRPC Session ID not specified in DT\n"); | |
854 | ||
855 | if (sessions > 0) { | |
856 | struct fastrpc_session_ctx *dup_sess; | |
857 | ||
858 | for (i = 1; i < sessions; i++) { | |
859 | if (cctx->sesscount++ >= FASTRPC_MAX_SESSIONS) | |
860 | break; | |
861 | dup_sess = &cctx->session[cctx->sesscount]; | |
862 | memcpy(dup_sess, sess, sizeof(*dup_sess)); | |
863 | } | |
864 | } | |
865 | cctx->sesscount++; | |
866 | spin_unlock(&cctx->lock); | |
867 | dma_set_mask(dev, DMA_BIT_MASK(32)); | |
868 | ||
869 | return 0; | |
870 | } | |
871 | ||
872 | static int fastrpc_cb_remove(struct platform_device *pdev) | |
873 | { | |
874 | struct fastrpc_channel_ctx *cctx = dev_get_drvdata(pdev->dev.parent); | |
875 | struct fastrpc_session_ctx *sess = dev_get_drvdata(&pdev->dev); | |
876 | int i; | |
877 | ||
878 | spin_lock(&cctx->lock); | |
879 | for (i = 1; i < FASTRPC_MAX_SESSIONS; i++) { | |
880 | if (cctx->session[i].sid == sess->sid) { | |
881 | cctx->session[i].valid = false; | |
882 | cctx->sesscount--; | |
883 | } | |
884 | } | |
885 | spin_unlock(&cctx->lock); | |
886 | ||
887 | return 0; | |
888 | } | |
889 | ||
890 | static const struct of_device_id fastrpc_match_table[] = { | |
891 | { .compatible = "qcom,fastrpc-compute-cb", }, | |
892 | {} | |
893 | }; | |
894 | ||
895 | static struct platform_driver fastrpc_cb_driver = { | |
896 | .probe = fastrpc_cb_probe, | |
897 | .remove = fastrpc_cb_remove, | |
898 | .driver = { | |
899 | .name = "qcom,fastrpc-cb", | |
900 | .of_match_table = fastrpc_match_table, | |
901 | .suppress_bind_attrs = true, | |
902 | }, | |
903 | }; | |
904 | ||
905 | static int fastrpc_rpmsg_probe(struct rpmsg_device *rpdev) | |
906 | { | |
907 | struct device *rdev = &rpdev->dev; | |
908 | struct fastrpc_channel_ctx *data; | |
909 | int i, err, domain_id = -1; | |
910 | const char *domain; | |
911 | ||
912 | data = devm_kzalloc(rdev, sizeof(*data), GFP_KERNEL); | |
913 | if (!data) | |
914 | return -ENOMEM; | |
915 | ||
916 | err = of_property_read_string(rdev->of_node, "label", &domain); | |
917 | if (err) { | |
918 | dev_info(rdev, "FastRPC Domain not specified in DT\n"); | |
919 | return err; | |
920 | } | |
921 | ||
922 | for (i = 0; i <= CDSP_DOMAIN_ID; i++) { | |
923 | if (!strcmp(domains[i], domain)) { | |
924 | domain_id = i; | |
925 | break; | |
926 | } | |
927 | } | |
928 | ||
929 | if (domain_id < 0) { | |
930 | dev_info(rdev, "FastRPC Invalid Domain ID %d\n", domain_id); | |
931 | return -EINVAL; | |
932 | } | |
933 | ||
934 | data->miscdev.minor = MISC_DYNAMIC_MINOR; | |
935 | data->miscdev.name = kasprintf(GFP_KERNEL, "fastrpc-%s", | |
936 | domains[domain_id]); | |
937 | data->miscdev.fops = &fastrpc_fops; | |
938 | err = misc_register(&data->miscdev); | |
939 | if (err) | |
940 | return err; | |
941 | ||
942 | dev_set_drvdata(&rpdev->dev, data); | |
943 | dma_set_mask_and_coherent(rdev, DMA_BIT_MASK(32)); | |
944 | INIT_LIST_HEAD(&data->users); | |
945 | spin_lock_init(&data->lock); | |
946 | idr_init(&data->ctx_idr); | |
947 | data->domain_id = domain_id; | |
948 | data->rpdev = rpdev; | |
949 | ||
950 | return of_platform_populate(rdev->of_node, NULL, NULL, rdev); | |
951 | } | |
952 | ||
c68cfb71 SK |
953 | static void fastrpc_notify_users(struct fastrpc_user *user) |
954 | { | |
955 | struct fastrpc_invoke_ctx *ctx; | |
956 | ||
957 | spin_lock(&user->lock); | |
958 | list_for_each_entry(ctx, &user->pending, node) | |
959 | complete(&ctx->work); | |
960 | spin_unlock(&user->lock); | |
961 | } | |
962 | ||
f6f9279f SK |
963 | static void fastrpc_rpmsg_remove(struct rpmsg_device *rpdev) |
964 | { | |
965 | struct fastrpc_channel_ctx *cctx = dev_get_drvdata(&rpdev->dev); | |
c68cfb71 SK |
966 | struct fastrpc_user *user; |
967 | ||
968 | spin_lock(&cctx->lock); | |
969 | list_for_each_entry(user, &cctx->users, user) | |
970 | fastrpc_notify_users(user); | |
971 | spin_unlock(&cctx->lock); | |
f6f9279f SK |
972 | |
973 | misc_deregister(&cctx->miscdev); | |
974 | of_platform_depopulate(&rpdev->dev); | |
975 | kfree(cctx); | |
976 | } | |
977 | ||
978 | static int fastrpc_rpmsg_callback(struct rpmsg_device *rpdev, void *data, | |
979 | int len, void *priv, u32 addr) | |
980 | { | |
c68cfb71 SK |
981 | struct fastrpc_channel_ctx *cctx = dev_get_drvdata(&rpdev->dev); |
982 | struct fastrpc_invoke_rsp *rsp = data; | |
983 | struct fastrpc_invoke_ctx *ctx; | |
984 | unsigned long flags; | |
985 | unsigned long ctxid; | |
986 | ||
987 | if (len < sizeof(*rsp)) | |
988 | return -EINVAL; | |
989 | ||
990 | ctxid = ((rsp->ctx & FASTRPC_CTXID_MASK) >> 4); | |
991 | ||
992 | spin_lock_irqsave(&cctx->lock, flags); | |
993 | ctx = idr_find(&cctx->ctx_idr, ctxid); | |
994 | spin_unlock_irqrestore(&cctx->lock, flags); | |
995 | ||
996 | if (!ctx) { | |
997 | dev_err(&rpdev->dev, "No context ID matches response\n"); | |
998 | return -ENOENT; | |
999 | } | |
1000 | ||
1001 | ctx->retval = rsp->retval; | |
1002 | complete(&ctx->work); | |
1003 | fastrpc_context_put(ctx); | |
1004 | ||
f6f9279f SK |
1005 | return 0; |
1006 | } | |
1007 | ||
1008 | static const struct of_device_id fastrpc_rpmsg_of_match[] = { | |
1009 | { .compatible = "qcom,fastrpc" }, | |
1010 | { }, | |
1011 | }; | |
1012 | MODULE_DEVICE_TABLE(of, fastrpc_rpmsg_of_match); | |
1013 | ||
1014 | static struct rpmsg_driver fastrpc_driver = { | |
1015 | .probe = fastrpc_rpmsg_probe, | |
1016 | .remove = fastrpc_rpmsg_remove, | |
1017 | .callback = fastrpc_rpmsg_callback, | |
1018 | .drv = { | |
1019 | .name = "qcom,fastrpc", | |
1020 | .of_match_table = fastrpc_rpmsg_of_match, | |
1021 | }, | |
1022 | }; | |
1023 | ||
1024 | static int fastrpc_init(void) | |
1025 | { | |
1026 | int ret; | |
1027 | ||
1028 | ret = platform_driver_register(&fastrpc_cb_driver); | |
1029 | if (ret < 0) { | |
1030 | pr_err("fastrpc: failed to register cb driver\n"); | |
1031 | return ret; | |
1032 | } | |
1033 | ||
1034 | ret = register_rpmsg_driver(&fastrpc_driver); | |
1035 | if (ret < 0) { | |
1036 | pr_err("fastrpc: failed to register rpmsg driver\n"); | |
1037 | platform_driver_unregister(&fastrpc_cb_driver); | |
1038 | return ret; | |
1039 | } | |
1040 | ||
1041 | return 0; | |
1042 | } | |
1043 | module_init(fastrpc_init); | |
1044 | ||
1045 | static void fastrpc_exit(void) | |
1046 | { | |
1047 | platform_driver_unregister(&fastrpc_cb_driver); | |
1048 | unregister_rpmsg_driver(&fastrpc_driver); | |
1049 | } | |
1050 | module_exit(fastrpc_exit); | |
1051 | ||
1052 | MODULE_LICENSE("GPL v2"); |