Commit | Line | Data |
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967c9cca JW |
1 | /* |
2 | * Copyright (c) 2015-2016, Linaro Limited | |
3 | * | |
4 | * This software is licensed under the terms of the GNU General Public | |
5 | * License version 2, as published by the Free Software Foundation, and | |
6 | * may be copied, distributed, and modified under those terms. | |
7 | * | |
8 | * This program is distributed in the hope that it will be useful, | |
9 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
10 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
11 | * GNU General Public License for more details. | |
12 | * | |
13 | */ | |
14 | #include <linux/device.h> | |
15 | #include <linux/dma-buf.h> | |
16 | #include <linux/fdtable.h> | |
17 | #include <linux/idr.h> | |
18 | #include <linux/sched.h> | |
19 | #include <linux/slab.h> | |
20 | #include <linux/tee_drv.h> | |
21 | #include "tee_private.h" | |
22 | ||
23 | static void tee_shm_release(struct tee_shm *shm) | |
24 | { | |
25 | struct tee_device *teedev = shm->teedev; | |
967c9cca JW |
26 | |
27 | mutex_lock(&teedev->mutex); | |
28 | idr_remove(&teedev->idr, shm->id); | |
29 | if (shm->ctx) | |
30 | list_del(&shm->link); | |
31 | mutex_unlock(&teedev->mutex); | |
32 | ||
033ddf12 JW |
33 | if (shm->flags & TEE_SHM_POOL) { |
34 | struct tee_shm_pool_mgr *poolm; | |
35 | ||
36 | if (shm->flags & TEE_SHM_DMA_BUF) | |
37 | poolm = teedev->pool->dma_buf_mgr; | |
38 | else | |
39 | poolm = teedev->pool->private_mgr; | |
40 | ||
41 | poolm->ops->free(poolm, shm); | |
42 | } else if (shm->flags & TEE_SHM_REGISTER) { | |
43 | size_t n; | |
44 | int rc = teedev->desc->ops->shm_unregister(shm->ctx, shm); | |
45 | ||
46 | if (rc) | |
47 | dev_err(teedev->dev.parent, | |
48 | "unregister shm %p failed: %d", shm, rc); | |
49 | ||
50 | for (n = 0; n < shm->num_pages; n++) | |
51 | put_page(shm->pages[n]); | |
52 | ||
53 | kfree(shm->pages); | |
54 | } | |
967c9cca | 55 | |
217e0250 VB |
56 | if (shm->ctx) |
57 | teedev_ctx_put(shm->ctx); | |
58 | ||
967c9cca JW |
59 | kfree(shm); |
60 | ||
61 | tee_device_put(teedev); | |
62 | } | |
63 | ||
64 | static struct sg_table *tee_shm_op_map_dma_buf(struct dma_buf_attachment | |
65 | *attach, enum dma_data_direction dir) | |
66 | { | |
67 | return NULL; | |
68 | } | |
69 | ||
70 | static void tee_shm_op_unmap_dma_buf(struct dma_buf_attachment *attach, | |
71 | struct sg_table *table, | |
72 | enum dma_data_direction dir) | |
73 | { | |
74 | } | |
75 | ||
76 | static void tee_shm_op_release(struct dma_buf *dmabuf) | |
77 | { | |
78 | struct tee_shm *shm = dmabuf->priv; | |
79 | ||
80 | tee_shm_release(shm); | |
81 | } | |
82 | ||
a2d9214c | 83 | static void *tee_shm_op_map(struct dma_buf *dmabuf, unsigned long pgnum) |
967c9cca JW |
84 | { |
85 | return NULL; | |
86 | } | |
87 | ||
88 | static int tee_shm_op_mmap(struct dma_buf *dmabuf, struct vm_area_struct *vma) | |
89 | { | |
90 | struct tee_shm *shm = dmabuf->priv; | |
91 | size_t size = vma->vm_end - vma->vm_start; | |
92 | ||
033ddf12 JW |
93 | /* Refuse sharing shared memory provided by application */ |
94 | if (shm->flags & TEE_SHM_REGISTER) | |
95 | return -EINVAL; | |
96 | ||
967c9cca JW |
97 | return remap_pfn_range(vma, vma->vm_start, shm->paddr >> PAGE_SHIFT, |
98 | size, vma->vm_page_prot); | |
99 | } | |
100 | ||
53e3ca5c | 101 | static const struct dma_buf_ops tee_shm_dma_buf_ops = { |
967c9cca JW |
102 | .map_dma_buf = tee_shm_op_map_dma_buf, |
103 | .unmap_dma_buf = tee_shm_op_unmap_dma_buf, | |
104 | .release = tee_shm_op_release, | |
a2d9214c | 105 | .map = tee_shm_op_map, |
967c9cca JW |
106 | .mmap = tee_shm_op_mmap, |
107 | }; | |
108 | ||
80ec6f5d CIK |
109 | static struct tee_shm *__tee_shm_alloc(struct tee_context *ctx, |
110 | struct tee_device *teedev, | |
111 | size_t size, u32 flags) | |
967c9cca | 112 | { |
967c9cca JW |
113 | struct tee_shm_pool_mgr *poolm = NULL; |
114 | struct tee_shm *shm; | |
115 | void *ret; | |
116 | int rc; | |
117 | ||
033ddf12 JW |
118 | if (ctx && ctx->teedev != teedev) { |
119 | dev_err(teedev->dev.parent, "ctx and teedev mismatch\n"); | |
120 | return ERR_PTR(-EINVAL); | |
121 | } | |
122 | ||
967c9cca JW |
123 | if (!(flags & TEE_SHM_MAPPED)) { |
124 | dev_err(teedev->dev.parent, | |
125 | "only mapped allocations supported\n"); | |
126 | return ERR_PTR(-EINVAL); | |
127 | } | |
128 | ||
129 | if ((flags & ~(TEE_SHM_MAPPED | TEE_SHM_DMA_BUF))) { | |
130 | dev_err(teedev->dev.parent, "invalid shm flags 0x%x", flags); | |
131 | return ERR_PTR(-EINVAL); | |
132 | } | |
133 | ||
134 | if (!tee_device_get(teedev)) | |
135 | return ERR_PTR(-EINVAL); | |
136 | ||
137 | if (!teedev->pool) { | |
138 | /* teedev has been detached from driver */ | |
139 | ret = ERR_PTR(-EINVAL); | |
140 | goto err_dev_put; | |
141 | } | |
142 | ||
143 | shm = kzalloc(sizeof(*shm), GFP_KERNEL); | |
144 | if (!shm) { | |
145 | ret = ERR_PTR(-ENOMEM); | |
146 | goto err_dev_put; | |
147 | } | |
148 | ||
033ddf12 | 149 | shm->flags = flags | TEE_SHM_POOL; |
967c9cca JW |
150 | shm->teedev = teedev; |
151 | shm->ctx = ctx; | |
152 | if (flags & TEE_SHM_DMA_BUF) | |
e2aca5d8 | 153 | poolm = teedev->pool->dma_buf_mgr; |
967c9cca | 154 | else |
e2aca5d8 | 155 | poolm = teedev->pool->private_mgr; |
967c9cca JW |
156 | |
157 | rc = poolm->ops->alloc(poolm, shm, size); | |
158 | if (rc) { | |
159 | ret = ERR_PTR(rc); | |
160 | goto err_kfree; | |
161 | } | |
162 | ||
163 | mutex_lock(&teedev->mutex); | |
164 | shm->id = idr_alloc(&teedev->idr, shm, 1, 0, GFP_KERNEL); | |
165 | mutex_unlock(&teedev->mutex); | |
166 | if (shm->id < 0) { | |
167 | ret = ERR_PTR(shm->id); | |
168 | goto err_pool_free; | |
169 | } | |
170 | ||
171 | if (flags & TEE_SHM_DMA_BUF) { | |
172 | DEFINE_DMA_BUF_EXPORT_INFO(exp_info); | |
173 | ||
174 | exp_info.ops = &tee_shm_dma_buf_ops; | |
175 | exp_info.size = shm->size; | |
176 | exp_info.flags = O_RDWR; | |
177 | exp_info.priv = shm; | |
178 | ||
179 | shm->dmabuf = dma_buf_export(&exp_info); | |
180 | if (IS_ERR(shm->dmabuf)) { | |
181 | ret = ERR_CAST(shm->dmabuf); | |
182 | goto err_rem; | |
183 | } | |
184 | } | |
033ddf12 JW |
185 | |
186 | if (ctx) { | |
217e0250 | 187 | teedev_ctx_get(ctx); |
033ddf12 JW |
188 | mutex_lock(&teedev->mutex); |
189 | list_add_tail(&shm->link, &ctx->list_shm); | |
190 | mutex_unlock(&teedev->mutex); | |
191 | } | |
967c9cca JW |
192 | |
193 | return shm; | |
194 | err_rem: | |
195 | mutex_lock(&teedev->mutex); | |
196 | idr_remove(&teedev->idr, shm->id); | |
197 | mutex_unlock(&teedev->mutex); | |
198 | err_pool_free: | |
199 | poolm->ops->free(poolm, shm); | |
200 | err_kfree: | |
201 | kfree(shm); | |
202 | err_dev_put: | |
203 | tee_device_put(teedev); | |
204 | return ret; | |
205 | } | |
033ddf12 JW |
206 | |
207 | /** | |
208 | * tee_shm_alloc() - Allocate shared memory | |
209 | * @ctx: Context that allocates the shared memory | |
210 | * @size: Requested size of shared memory | |
211 | * @flags: Flags setting properties for the requested shared memory. | |
212 | * | |
213 | * Memory allocated as global shared memory is automatically freed when the | |
214 | * TEE file pointer is closed. The @flags field uses the bits defined by | |
215 | * TEE_SHM_* in <linux/tee_drv.h>. TEE_SHM_MAPPED must currently always be | |
216 | * set. If TEE_SHM_DMA_BUF global shared memory will be allocated and | |
217 | * associated with a dma-buf handle, else driver private memory. | |
218 | */ | |
219 | struct tee_shm *tee_shm_alloc(struct tee_context *ctx, size_t size, u32 flags) | |
220 | { | |
221 | return __tee_shm_alloc(ctx, ctx->teedev, size, flags); | |
222 | } | |
967c9cca JW |
223 | EXPORT_SYMBOL_GPL(tee_shm_alloc); |
224 | ||
033ddf12 JW |
225 | struct tee_shm *tee_shm_priv_alloc(struct tee_device *teedev, size_t size) |
226 | { | |
227 | return __tee_shm_alloc(NULL, teedev, size, TEE_SHM_MAPPED); | |
228 | } | |
229 | EXPORT_SYMBOL_GPL(tee_shm_priv_alloc); | |
230 | ||
231 | struct tee_shm *tee_shm_register(struct tee_context *ctx, unsigned long addr, | |
232 | size_t length, u32 flags) | |
233 | { | |
234 | struct tee_device *teedev = ctx->teedev; | |
235 | const u32 req_flags = TEE_SHM_DMA_BUF | TEE_SHM_USER_MAPPED; | |
236 | struct tee_shm *shm; | |
237 | void *ret; | |
238 | int rc; | |
239 | int num_pages; | |
240 | unsigned long start; | |
241 | ||
242 | if (flags != req_flags) | |
243 | return ERR_PTR(-ENOTSUPP); | |
244 | ||
245 | if (!tee_device_get(teedev)) | |
246 | return ERR_PTR(-EINVAL); | |
247 | ||
248 | if (!teedev->desc->ops->shm_register || | |
249 | !teedev->desc->ops->shm_unregister) { | |
250 | tee_device_put(teedev); | |
251 | return ERR_PTR(-ENOTSUPP); | |
252 | } | |
253 | ||
217e0250 VB |
254 | teedev_ctx_get(ctx); |
255 | ||
033ddf12 JW |
256 | shm = kzalloc(sizeof(*shm), GFP_KERNEL); |
257 | if (!shm) { | |
258 | ret = ERR_PTR(-ENOMEM); | |
259 | goto err; | |
260 | } | |
261 | ||
262 | shm->flags = flags | TEE_SHM_REGISTER; | |
263 | shm->teedev = teedev; | |
264 | shm->ctx = ctx; | |
265 | shm->id = -1; | |
266 | start = rounddown(addr, PAGE_SIZE); | |
267 | shm->offset = addr - start; | |
268 | shm->size = length; | |
269 | num_pages = (roundup(addr + length, PAGE_SIZE) - start) / PAGE_SIZE; | |
270 | shm->pages = kcalloc(num_pages, sizeof(*shm->pages), GFP_KERNEL); | |
271 | if (!shm->pages) { | |
272 | ret = ERR_PTR(-ENOMEM); | |
273 | goto err; | |
274 | } | |
275 | ||
276 | rc = get_user_pages_fast(start, num_pages, 1, shm->pages); | |
277 | if (rc > 0) | |
278 | shm->num_pages = rc; | |
279 | if (rc != num_pages) { | |
2490cdf6 | 280 | if (rc >= 0) |
033ddf12 JW |
281 | rc = -ENOMEM; |
282 | ret = ERR_PTR(rc); | |
283 | goto err; | |
284 | } | |
285 | ||
286 | mutex_lock(&teedev->mutex); | |
287 | shm->id = idr_alloc(&teedev->idr, shm, 1, 0, GFP_KERNEL); | |
288 | mutex_unlock(&teedev->mutex); | |
289 | ||
290 | if (shm->id < 0) { | |
291 | ret = ERR_PTR(shm->id); | |
292 | goto err; | |
293 | } | |
294 | ||
295 | rc = teedev->desc->ops->shm_register(ctx, shm, shm->pages, | |
95ffe4ca | 296 | shm->num_pages, start); |
033ddf12 JW |
297 | if (rc) { |
298 | ret = ERR_PTR(rc); | |
299 | goto err; | |
300 | } | |
301 | ||
302 | if (flags & TEE_SHM_DMA_BUF) { | |
303 | DEFINE_DMA_BUF_EXPORT_INFO(exp_info); | |
304 | ||
305 | exp_info.ops = &tee_shm_dma_buf_ops; | |
306 | exp_info.size = shm->size; | |
307 | exp_info.flags = O_RDWR; | |
308 | exp_info.priv = shm; | |
309 | ||
310 | shm->dmabuf = dma_buf_export(&exp_info); | |
311 | if (IS_ERR(shm->dmabuf)) { | |
312 | ret = ERR_CAST(shm->dmabuf); | |
313 | teedev->desc->ops->shm_unregister(ctx, shm); | |
314 | goto err; | |
315 | } | |
316 | } | |
317 | ||
318 | mutex_lock(&teedev->mutex); | |
319 | list_add_tail(&shm->link, &ctx->list_shm); | |
320 | mutex_unlock(&teedev->mutex); | |
321 | ||
322 | return shm; | |
323 | err: | |
324 | if (shm) { | |
325 | size_t n; | |
326 | ||
327 | if (shm->id >= 0) { | |
328 | mutex_lock(&teedev->mutex); | |
329 | idr_remove(&teedev->idr, shm->id); | |
330 | mutex_unlock(&teedev->mutex); | |
331 | } | |
c94f31b5 CIK |
332 | if (shm->pages) { |
333 | for (n = 0; n < shm->num_pages; n++) | |
334 | put_page(shm->pages[n]); | |
335 | kfree(shm->pages); | |
336 | } | |
033ddf12 JW |
337 | } |
338 | kfree(shm); | |
217e0250 | 339 | teedev_ctx_put(ctx); |
033ddf12 JW |
340 | tee_device_put(teedev); |
341 | return ret; | |
342 | } | |
343 | EXPORT_SYMBOL_GPL(tee_shm_register); | |
344 | ||
967c9cca JW |
345 | /** |
346 | * tee_shm_get_fd() - Increase reference count and return file descriptor | |
347 | * @shm: Shared memory handle | |
348 | * @returns user space file descriptor to shared memory | |
349 | */ | |
350 | int tee_shm_get_fd(struct tee_shm *shm) | |
351 | { | |
967c9cca JW |
352 | int fd; |
353 | ||
033ddf12 | 354 | if (!(shm->flags & TEE_SHM_DMA_BUF)) |
967c9cca JW |
355 | return -EINVAL; |
356 | ||
bb765d1c | 357 | get_dma_buf(shm->dmabuf); |
967c9cca | 358 | fd = dma_buf_fd(shm->dmabuf, O_CLOEXEC); |
bb765d1c JH |
359 | if (fd < 0) |
360 | dma_buf_put(shm->dmabuf); | |
967c9cca JW |
361 | return fd; |
362 | } | |
363 | ||
364 | /** | |
365 | * tee_shm_free() - Free shared memory | |
366 | * @shm: Handle to shared memory to free | |
367 | */ | |
368 | void tee_shm_free(struct tee_shm *shm) | |
369 | { | |
370 | /* | |
371 | * dma_buf_put() decreases the dmabuf reference counter and will | |
372 | * call tee_shm_release() when the last reference is gone. | |
373 | * | |
374 | * In the case of driver private memory we call tee_shm_release | |
375 | * directly instead as it doesn't have a reference counter. | |
376 | */ | |
377 | if (shm->flags & TEE_SHM_DMA_BUF) | |
378 | dma_buf_put(shm->dmabuf); | |
379 | else | |
380 | tee_shm_release(shm); | |
381 | } | |
382 | EXPORT_SYMBOL_GPL(tee_shm_free); | |
383 | ||
384 | /** | |
385 | * tee_shm_va2pa() - Get physical address of a virtual address | |
386 | * @shm: Shared memory handle | |
387 | * @va: Virtual address to tranlsate | |
388 | * @pa: Returned physical address | |
389 | * @returns 0 on success and < 0 on failure | |
390 | */ | |
391 | int tee_shm_va2pa(struct tee_shm *shm, void *va, phys_addr_t *pa) | |
392 | { | |
033ddf12 JW |
393 | if (!(shm->flags & TEE_SHM_MAPPED)) |
394 | return -EINVAL; | |
967c9cca JW |
395 | /* Check that we're in the range of the shm */ |
396 | if ((char *)va < (char *)shm->kaddr) | |
397 | return -EINVAL; | |
398 | if ((char *)va >= ((char *)shm->kaddr + shm->size)) | |
399 | return -EINVAL; | |
400 | ||
401 | return tee_shm_get_pa( | |
402 | shm, (unsigned long)va - (unsigned long)shm->kaddr, pa); | |
403 | } | |
404 | EXPORT_SYMBOL_GPL(tee_shm_va2pa); | |
405 | ||
406 | /** | |
407 | * tee_shm_pa2va() - Get virtual address of a physical address | |
408 | * @shm: Shared memory handle | |
409 | * @pa: Physical address to tranlsate | |
410 | * @va: Returned virtual address | |
411 | * @returns 0 on success and < 0 on failure | |
412 | */ | |
413 | int tee_shm_pa2va(struct tee_shm *shm, phys_addr_t pa, void **va) | |
414 | { | |
033ddf12 JW |
415 | if (!(shm->flags & TEE_SHM_MAPPED)) |
416 | return -EINVAL; | |
967c9cca JW |
417 | /* Check that we're in the range of the shm */ |
418 | if (pa < shm->paddr) | |
419 | return -EINVAL; | |
420 | if (pa >= (shm->paddr + shm->size)) | |
421 | return -EINVAL; | |
422 | ||
423 | if (va) { | |
424 | void *v = tee_shm_get_va(shm, pa - shm->paddr); | |
425 | ||
426 | if (IS_ERR(v)) | |
427 | return PTR_ERR(v); | |
428 | *va = v; | |
429 | } | |
430 | return 0; | |
431 | } | |
432 | EXPORT_SYMBOL_GPL(tee_shm_pa2va); | |
433 | ||
434 | /** | |
435 | * tee_shm_get_va() - Get virtual address of a shared memory plus an offset | |
436 | * @shm: Shared memory handle | |
437 | * @offs: Offset from start of this shared memory | |
438 | * @returns virtual address of the shared memory + offs if offs is within | |
439 | * the bounds of this shared memory, else an ERR_PTR | |
440 | */ | |
441 | void *tee_shm_get_va(struct tee_shm *shm, size_t offs) | |
442 | { | |
033ddf12 JW |
443 | if (!(shm->flags & TEE_SHM_MAPPED)) |
444 | return ERR_PTR(-EINVAL); | |
967c9cca JW |
445 | if (offs >= shm->size) |
446 | return ERR_PTR(-EINVAL); | |
447 | return (char *)shm->kaddr + offs; | |
448 | } | |
449 | EXPORT_SYMBOL_GPL(tee_shm_get_va); | |
450 | ||
451 | /** | |
452 | * tee_shm_get_pa() - Get physical address of a shared memory plus an offset | |
453 | * @shm: Shared memory handle | |
454 | * @offs: Offset from start of this shared memory | |
455 | * @pa: Physical address to return | |
456 | * @returns 0 if offs is within the bounds of this shared memory, else an | |
457 | * error code. | |
458 | */ | |
459 | int tee_shm_get_pa(struct tee_shm *shm, size_t offs, phys_addr_t *pa) | |
460 | { | |
461 | if (offs >= shm->size) | |
462 | return -EINVAL; | |
463 | if (pa) | |
464 | *pa = shm->paddr + offs; | |
465 | return 0; | |
466 | } | |
467 | EXPORT_SYMBOL_GPL(tee_shm_get_pa); | |
468 | ||
469 | /** | |
470 | * tee_shm_get_from_id() - Find shared memory object and increase reference | |
471 | * count | |
472 | * @ctx: Context owning the shared memory | |
473 | * @id: Id of shared memory object | |
474 | * @returns a pointer to 'struct tee_shm' on success or an ERR_PTR on failure | |
475 | */ | |
476 | struct tee_shm *tee_shm_get_from_id(struct tee_context *ctx, int id) | |
477 | { | |
478 | struct tee_device *teedev; | |
479 | struct tee_shm *shm; | |
480 | ||
481 | if (!ctx) | |
482 | return ERR_PTR(-EINVAL); | |
483 | ||
484 | teedev = ctx->teedev; | |
485 | mutex_lock(&teedev->mutex); | |
486 | shm = idr_find(&teedev->idr, id); | |
487 | if (!shm || shm->ctx != ctx) | |
488 | shm = ERR_PTR(-EINVAL); | |
489 | else if (shm->flags & TEE_SHM_DMA_BUF) | |
490 | get_dma_buf(shm->dmabuf); | |
491 | mutex_unlock(&teedev->mutex); | |
492 | return shm; | |
493 | } | |
494 | EXPORT_SYMBOL_GPL(tee_shm_get_from_id); | |
495 | ||
967c9cca JW |
496 | /** |
497 | * tee_shm_put() - Decrease reference count on a shared memory handle | |
498 | * @shm: Shared memory handle | |
499 | */ | |
500 | void tee_shm_put(struct tee_shm *shm) | |
501 | { | |
502 | if (shm->flags & TEE_SHM_DMA_BUF) | |
503 | dma_buf_put(shm->dmabuf); | |
504 | } | |
505 | EXPORT_SYMBOL_GPL(tee_shm_put); |