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9c92ab61 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
967c9cca JW |
2 | /* |
3 | * Copyright (c) 2015-2016, Linaro Limited | |
967c9cca JW |
4 | */ |
5 | #include <linux/device.h> | |
6 | #include <linux/dma-buf.h> | |
7 | #include <linux/fdtable.h> | |
8 | #include <linux/idr.h> | |
9 | #include <linux/sched.h> | |
10 | #include <linux/slab.h> | |
11 | #include <linux/tee_drv.h> | |
12 | #include "tee_private.h" | |
13 | ||
14 | static void tee_shm_release(struct tee_shm *shm) | |
15 | { | |
16 | struct tee_device *teedev = shm->teedev; | |
967c9cca JW |
17 | |
18 | mutex_lock(&teedev->mutex); | |
19 | idr_remove(&teedev->idr, shm->id); | |
20 | if (shm->ctx) | |
21 | list_del(&shm->link); | |
22 | mutex_unlock(&teedev->mutex); | |
23 | ||
033ddf12 JW |
24 | if (shm->flags & TEE_SHM_POOL) { |
25 | struct tee_shm_pool_mgr *poolm; | |
26 | ||
27 | if (shm->flags & TEE_SHM_DMA_BUF) | |
28 | poolm = teedev->pool->dma_buf_mgr; | |
29 | else | |
30 | poolm = teedev->pool->private_mgr; | |
31 | ||
32 | poolm->ops->free(poolm, shm); | |
33 | } else if (shm->flags & TEE_SHM_REGISTER) { | |
34 | size_t n; | |
35 | int rc = teedev->desc->ops->shm_unregister(shm->ctx, shm); | |
36 | ||
37 | if (rc) | |
38 | dev_err(teedev->dev.parent, | |
39 | "unregister shm %p failed: %d", shm, rc); | |
40 | ||
41 | for (n = 0; n < shm->num_pages; n++) | |
42 | put_page(shm->pages[n]); | |
43 | ||
44 | kfree(shm->pages); | |
45 | } | |
967c9cca | 46 | |
217e0250 VB |
47 | if (shm->ctx) |
48 | teedev_ctx_put(shm->ctx); | |
49 | ||
967c9cca JW |
50 | kfree(shm); |
51 | ||
52 | tee_device_put(teedev); | |
53 | } | |
54 | ||
55 | static struct sg_table *tee_shm_op_map_dma_buf(struct dma_buf_attachment | |
56 | *attach, enum dma_data_direction dir) | |
57 | { | |
58 | return NULL; | |
59 | } | |
60 | ||
61 | static void tee_shm_op_unmap_dma_buf(struct dma_buf_attachment *attach, | |
62 | struct sg_table *table, | |
63 | enum dma_data_direction dir) | |
64 | { | |
65 | } | |
66 | ||
67 | static void tee_shm_op_release(struct dma_buf *dmabuf) | |
68 | { | |
69 | struct tee_shm *shm = dmabuf->priv; | |
70 | ||
71 | tee_shm_release(shm); | |
72 | } | |
73 | ||
a2d9214c | 74 | static void *tee_shm_op_map(struct dma_buf *dmabuf, unsigned long pgnum) |
967c9cca JW |
75 | { |
76 | return NULL; | |
77 | } | |
78 | ||
79 | static int tee_shm_op_mmap(struct dma_buf *dmabuf, struct vm_area_struct *vma) | |
80 | { | |
81 | struct tee_shm *shm = dmabuf->priv; | |
82 | size_t size = vma->vm_end - vma->vm_start; | |
83 | ||
033ddf12 JW |
84 | /* Refuse sharing shared memory provided by application */ |
85 | if (shm->flags & TEE_SHM_REGISTER) | |
86 | return -EINVAL; | |
87 | ||
967c9cca JW |
88 | return remap_pfn_range(vma, vma->vm_start, shm->paddr >> PAGE_SHIFT, |
89 | size, vma->vm_page_prot); | |
90 | } | |
91 | ||
53e3ca5c | 92 | static const struct dma_buf_ops tee_shm_dma_buf_ops = { |
967c9cca JW |
93 | .map_dma_buf = tee_shm_op_map_dma_buf, |
94 | .unmap_dma_buf = tee_shm_op_unmap_dma_buf, | |
95 | .release = tee_shm_op_release, | |
a2d9214c | 96 | .map = tee_shm_op_map, |
967c9cca JW |
97 | .mmap = tee_shm_op_mmap, |
98 | }; | |
99 | ||
80ec6f5d CIK |
100 | static struct tee_shm *__tee_shm_alloc(struct tee_context *ctx, |
101 | struct tee_device *teedev, | |
102 | size_t size, u32 flags) | |
967c9cca | 103 | { |
967c9cca JW |
104 | struct tee_shm_pool_mgr *poolm = NULL; |
105 | struct tee_shm *shm; | |
106 | void *ret; | |
107 | int rc; | |
108 | ||
033ddf12 JW |
109 | if (ctx && ctx->teedev != teedev) { |
110 | dev_err(teedev->dev.parent, "ctx and teedev mismatch\n"); | |
111 | return ERR_PTR(-EINVAL); | |
112 | } | |
113 | ||
967c9cca JW |
114 | if (!(flags & TEE_SHM_MAPPED)) { |
115 | dev_err(teedev->dev.parent, | |
116 | "only mapped allocations supported\n"); | |
117 | return ERR_PTR(-EINVAL); | |
118 | } | |
119 | ||
120 | if ((flags & ~(TEE_SHM_MAPPED | TEE_SHM_DMA_BUF))) { | |
121 | dev_err(teedev->dev.parent, "invalid shm flags 0x%x", flags); | |
122 | return ERR_PTR(-EINVAL); | |
123 | } | |
124 | ||
125 | if (!tee_device_get(teedev)) | |
126 | return ERR_PTR(-EINVAL); | |
127 | ||
128 | if (!teedev->pool) { | |
129 | /* teedev has been detached from driver */ | |
130 | ret = ERR_PTR(-EINVAL); | |
131 | goto err_dev_put; | |
132 | } | |
133 | ||
134 | shm = kzalloc(sizeof(*shm), GFP_KERNEL); | |
135 | if (!shm) { | |
136 | ret = ERR_PTR(-ENOMEM); | |
137 | goto err_dev_put; | |
138 | } | |
139 | ||
033ddf12 | 140 | shm->flags = flags | TEE_SHM_POOL; |
967c9cca JW |
141 | shm->teedev = teedev; |
142 | shm->ctx = ctx; | |
143 | if (flags & TEE_SHM_DMA_BUF) | |
e2aca5d8 | 144 | poolm = teedev->pool->dma_buf_mgr; |
967c9cca | 145 | else |
e2aca5d8 | 146 | poolm = teedev->pool->private_mgr; |
967c9cca JW |
147 | |
148 | rc = poolm->ops->alloc(poolm, shm, size); | |
149 | if (rc) { | |
150 | ret = ERR_PTR(rc); | |
151 | goto err_kfree; | |
152 | } | |
153 | ||
154 | mutex_lock(&teedev->mutex); | |
155 | shm->id = idr_alloc(&teedev->idr, shm, 1, 0, GFP_KERNEL); | |
156 | mutex_unlock(&teedev->mutex); | |
157 | if (shm->id < 0) { | |
158 | ret = ERR_PTR(shm->id); | |
159 | goto err_pool_free; | |
160 | } | |
161 | ||
162 | if (flags & TEE_SHM_DMA_BUF) { | |
163 | DEFINE_DMA_BUF_EXPORT_INFO(exp_info); | |
164 | ||
165 | exp_info.ops = &tee_shm_dma_buf_ops; | |
166 | exp_info.size = shm->size; | |
167 | exp_info.flags = O_RDWR; | |
168 | exp_info.priv = shm; | |
169 | ||
170 | shm->dmabuf = dma_buf_export(&exp_info); | |
171 | if (IS_ERR(shm->dmabuf)) { | |
172 | ret = ERR_CAST(shm->dmabuf); | |
173 | goto err_rem; | |
174 | } | |
175 | } | |
033ddf12 JW |
176 | |
177 | if (ctx) { | |
217e0250 | 178 | teedev_ctx_get(ctx); |
033ddf12 JW |
179 | mutex_lock(&teedev->mutex); |
180 | list_add_tail(&shm->link, &ctx->list_shm); | |
181 | mutex_unlock(&teedev->mutex); | |
182 | } | |
967c9cca JW |
183 | |
184 | return shm; | |
185 | err_rem: | |
186 | mutex_lock(&teedev->mutex); | |
187 | idr_remove(&teedev->idr, shm->id); | |
188 | mutex_unlock(&teedev->mutex); | |
189 | err_pool_free: | |
190 | poolm->ops->free(poolm, shm); | |
191 | err_kfree: | |
192 | kfree(shm); | |
193 | err_dev_put: | |
194 | tee_device_put(teedev); | |
195 | return ret; | |
196 | } | |
033ddf12 JW |
197 | |
198 | /** | |
199 | * tee_shm_alloc() - Allocate shared memory | |
200 | * @ctx: Context that allocates the shared memory | |
201 | * @size: Requested size of shared memory | |
202 | * @flags: Flags setting properties for the requested shared memory. | |
203 | * | |
204 | * Memory allocated as global shared memory is automatically freed when the | |
205 | * TEE file pointer is closed. The @flags field uses the bits defined by | |
206 | * TEE_SHM_* in <linux/tee_drv.h>. TEE_SHM_MAPPED must currently always be | |
207 | * set. If TEE_SHM_DMA_BUF global shared memory will be allocated and | |
208 | * associated with a dma-buf handle, else driver private memory. | |
209 | */ | |
210 | struct tee_shm *tee_shm_alloc(struct tee_context *ctx, size_t size, u32 flags) | |
211 | { | |
212 | return __tee_shm_alloc(ctx, ctx->teedev, size, flags); | |
213 | } | |
967c9cca JW |
214 | EXPORT_SYMBOL_GPL(tee_shm_alloc); |
215 | ||
033ddf12 JW |
216 | struct tee_shm *tee_shm_priv_alloc(struct tee_device *teedev, size_t size) |
217 | { | |
218 | return __tee_shm_alloc(NULL, teedev, size, TEE_SHM_MAPPED); | |
219 | } | |
220 | EXPORT_SYMBOL_GPL(tee_shm_priv_alloc); | |
221 | ||
222 | struct tee_shm *tee_shm_register(struct tee_context *ctx, unsigned long addr, | |
223 | size_t length, u32 flags) | |
224 | { | |
225 | struct tee_device *teedev = ctx->teedev; | |
226 | const u32 req_flags = TEE_SHM_DMA_BUF | TEE_SHM_USER_MAPPED; | |
227 | struct tee_shm *shm; | |
228 | void *ret; | |
229 | int rc; | |
230 | int num_pages; | |
231 | unsigned long start; | |
232 | ||
233 | if (flags != req_flags) | |
234 | return ERR_PTR(-ENOTSUPP); | |
235 | ||
236 | if (!tee_device_get(teedev)) | |
237 | return ERR_PTR(-EINVAL); | |
238 | ||
239 | if (!teedev->desc->ops->shm_register || | |
240 | !teedev->desc->ops->shm_unregister) { | |
241 | tee_device_put(teedev); | |
242 | return ERR_PTR(-ENOTSUPP); | |
243 | } | |
244 | ||
217e0250 VB |
245 | teedev_ctx_get(ctx); |
246 | ||
033ddf12 JW |
247 | shm = kzalloc(sizeof(*shm), GFP_KERNEL); |
248 | if (!shm) { | |
249 | ret = ERR_PTR(-ENOMEM); | |
250 | goto err; | |
251 | } | |
252 | ||
253 | shm->flags = flags | TEE_SHM_REGISTER; | |
254 | shm->teedev = teedev; | |
255 | shm->ctx = ctx; | |
256 | shm->id = -1; | |
257 | start = rounddown(addr, PAGE_SIZE); | |
258 | shm->offset = addr - start; | |
259 | shm->size = length; | |
260 | num_pages = (roundup(addr + length, PAGE_SIZE) - start) / PAGE_SIZE; | |
261 | shm->pages = kcalloc(num_pages, sizeof(*shm->pages), GFP_KERNEL); | |
262 | if (!shm->pages) { | |
263 | ret = ERR_PTR(-ENOMEM); | |
264 | goto err; | |
265 | } | |
266 | ||
73b0140b | 267 | rc = get_user_pages_fast(start, num_pages, FOLL_WRITE, shm->pages); |
033ddf12 JW |
268 | if (rc > 0) |
269 | shm->num_pages = rc; | |
270 | if (rc != num_pages) { | |
2490cdf6 | 271 | if (rc >= 0) |
033ddf12 JW |
272 | rc = -ENOMEM; |
273 | ret = ERR_PTR(rc); | |
274 | goto err; | |
275 | } | |
276 | ||
277 | mutex_lock(&teedev->mutex); | |
278 | shm->id = idr_alloc(&teedev->idr, shm, 1, 0, GFP_KERNEL); | |
279 | mutex_unlock(&teedev->mutex); | |
280 | ||
281 | if (shm->id < 0) { | |
282 | ret = ERR_PTR(shm->id); | |
283 | goto err; | |
284 | } | |
285 | ||
286 | rc = teedev->desc->ops->shm_register(ctx, shm, shm->pages, | |
95ffe4ca | 287 | shm->num_pages, start); |
033ddf12 JW |
288 | if (rc) { |
289 | ret = ERR_PTR(rc); | |
290 | goto err; | |
291 | } | |
292 | ||
293 | if (flags & TEE_SHM_DMA_BUF) { | |
294 | DEFINE_DMA_BUF_EXPORT_INFO(exp_info); | |
295 | ||
296 | exp_info.ops = &tee_shm_dma_buf_ops; | |
297 | exp_info.size = shm->size; | |
298 | exp_info.flags = O_RDWR; | |
299 | exp_info.priv = shm; | |
300 | ||
301 | shm->dmabuf = dma_buf_export(&exp_info); | |
302 | if (IS_ERR(shm->dmabuf)) { | |
303 | ret = ERR_CAST(shm->dmabuf); | |
304 | teedev->desc->ops->shm_unregister(ctx, shm); | |
305 | goto err; | |
306 | } | |
307 | } | |
308 | ||
309 | mutex_lock(&teedev->mutex); | |
310 | list_add_tail(&shm->link, &ctx->list_shm); | |
311 | mutex_unlock(&teedev->mutex); | |
312 | ||
313 | return shm; | |
314 | err: | |
315 | if (shm) { | |
316 | size_t n; | |
317 | ||
318 | if (shm->id >= 0) { | |
319 | mutex_lock(&teedev->mutex); | |
320 | idr_remove(&teedev->idr, shm->id); | |
321 | mutex_unlock(&teedev->mutex); | |
322 | } | |
c94f31b5 CIK |
323 | if (shm->pages) { |
324 | for (n = 0; n < shm->num_pages; n++) | |
325 | put_page(shm->pages[n]); | |
326 | kfree(shm->pages); | |
327 | } | |
033ddf12 JW |
328 | } |
329 | kfree(shm); | |
217e0250 | 330 | teedev_ctx_put(ctx); |
033ddf12 JW |
331 | tee_device_put(teedev); |
332 | return ret; | |
333 | } | |
334 | EXPORT_SYMBOL_GPL(tee_shm_register); | |
335 | ||
967c9cca JW |
336 | /** |
337 | * tee_shm_get_fd() - Increase reference count and return file descriptor | |
338 | * @shm: Shared memory handle | |
339 | * @returns user space file descriptor to shared memory | |
340 | */ | |
341 | int tee_shm_get_fd(struct tee_shm *shm) | |
342 | { | |
967c9cca JW |
343 | int fd; |
344 | ||
033ddf12 | 345 | if (!(shm->flags & TEE_SHM_DMA_BUF)) |
967c9cca JW |
346 | return -EINVAL; |
347 | ||
bb765d1c | 348 | get_dma_buf(shm->dmabuf); |
967c9cca | 349 | fd = dma_buf_fd(shm->dmabuf, O_CLOEXEC); |
bb765d1c JH |
350 | if (fd < 0) |
351 | dma_buf_put(shm->dmabuf); | |
967c9cca JW |
352 | return fd; |
353 | } | |
354 | ||
355 | /** | |
356 | * tee_shm_free() - Free shared memory | |
357 | * @shm: Handle to shared memory to free | |
358 | */ | |
359 | void tee_shm_free(struct tee_shm *shm) | |
360 | { | |
361 | /* | |
362 | * dma_buf_put() decreases the dmabuf reference counter and will | |
363 | * call tee_shm_release() when the last reference is gone. | |
364 | * | |
365 | * In the case of driver private memory we call tee_shm_release | |
366 | * directly instead as it doesn't have a reference counter. | |
367 | */ | |
368 | if (shm->flags & TEE_SHM_DMA_BUF) | |
369 | dma_buf_put(shm->dmabuf); | |
370 | else | |
371 | tee_shm_release(shm); | |
372 | } | |
373 | EXPORT_SYMBOL_GPL(tee_shm_free); | |
374 | ||
375 | /** | |
376 | * tee_shm_va2pa() - Get physical address of a virtual address | |
377 | * @shm: Shared memory handle | |
378 | * @va: Virtual address to tranlsate | |
379 | * @pa: Returned physical address | |
380 | * @returns 0 on success and < 0 on failure | |
381 | */ | |
382 | int tee_shm_va2pa(struct tee_shm *shm, void *va, phys_addr_t *pa) | |
383 | { | |
033ddf12 JW |
384 | if (!(shm->flags & TEE_SHM_MAPPED)) |
385 | return -EINVAL; | |
967c9cca JW |
386 | /* Check that we're in the range of the shm */ |
387 | if ((char *)va < (char *)shm->kaddr) | |
388 | return -EINVAL; | |
389 | if ((char *)va >= ((char *)shm->kaddr + shm->size)) | |
390 | return -EINVAL; | |
391 | ||
392 | return tee_shm_get_pa( | |
393 | shm, (unsigned long)va - (unsigned long)shm->kaddr, pa); | |
394 | } | |
395 | EXPORT_SYMBOL_GPL(tee_shm_va2pa); | |
396 | ||
397 | /** | |
398 | * tee_shm_pa2va() - Get virtual address of a physical address | |
399 | * @shm: Shared memory handle | |
400 | * @pa: Physical address to tranlsate | |
401 | * @va: Returned virtual address | |
402 | * @returns 0 on success and < 0 on failure | |
403 | */ | |
404 | int tee_shm_pa2va(struct tee_shm *shm, phys_addr_t pa, void **va) | |
405 | { | |
033ddf12 JW |
406 | if (!(shm->flags & TEE_SHM_MAPPED)) |
407 | return -EINVAL; | |
967c9cca JW |
408 | /* Check that we're in the range of the shm */ |
409 | if (pa < shm->paddr) | |
410 | return -EINVAL; | |
411 | if (pa >= (shm->paddr + shm->size)) | |
412 | return -EINVAL; | |
413 | ||
414 | if (va) { | |
415 | void *v = tee_shm_get_va(shm, pa - shm->paddr); | |
416 | ||
417 | if (IS_ERR(v)) | |
418 | return PTR_ERR(v); | |
419 | *va = v; | |
420 | } | |
421 | return 0; | |
422 | } | |
423 | EXPORT_SYMBOL_GPL(tee_shm_pa2va); | |
424 | ||
425 | /** | |
426 | * tee_shm_get_va() - Get virtual address of a shared memory plus an offset | |
427 | * @shm: Shared memory handle | |
428 | * @offs: Offset from start of this shared memory | |
429 | * @returns virtual address of the shared memory + offs if offs is within | |
430 | * the bounds of this shared memory, else an ERR_PTR | |
431 | */ | |
432 | void *tee_shm_get_va(struct tee_shm *shm, size_t offs) | |
433 | { | |
033ddf12 JW |
434 | if (!(shm->flags & TEE_SHM_MAPPED)) |
435 | return ERR_PTR(-EINVAL); | |
967c9cca JW |
436 | if (offs >= shm->size) |
437 | return ERR_PTR(-EINVAL); | |
438 | return (char *)shm->kaddr + offs; | |
439 | } | |
440 | EXPORT_SYMBOL_GPL(tee_shm_get_va); | |
441 | ||
442 | /** | |
443 | * tee_shm_get_pa() - Get physical address of a shared memory plus an offset | |
444 | * @shm: Shared memory handle | |
445 | * @offs: Offset from start of this shared memory | |
446 | * @pa: Physical address to return | |
447 | * @returns 0 if offs is within the bounds of this shared memory, else an | |
448 | * error code. | |
449 | */ | |
450 | int tee_shm_get_pa(struct tee_shm *shm, size_t offs, phys_addr_t *pa) | |
451 | { | |
452 | if (offs >= shm->size) | |
453 | return -EINVAL; | |
454 | if (pa) | |
455 | *pa = shm->paddr + offs; | |
456 | return 0; | |
457 | } | |
458 | EXPORT_SYMBOL_GPL(tee_shm_get_pa); | |
459 | ||
460 | /** | |
461 | * tee_shm_get_from_id() - Find shared memory object and increase reference | |
462 | * count | |
463 | * @ctx: Context owning the shared memory | |
464 | * @id: Id of shared memory object | |
465 | * @returns a pointer to 'struct tee_shm' on success or an ERR_PTR on failure | |
466 | */ | |
467 | struct tee_shm *tee_shm_get_from_id(struct tee_context *ctx, int id) | |
468 | { | |
469 | struct tee_device *teedev; | |
470 | struct tee_shm *shm; | |
471 | ||
472 | if (!ctx) | |
473 | return ERR_PTR(-EINVAL); | |
474 | ||
475 | teedev = ctx->teedev; | |
476 | mutex_lock(&teedev->mutex); | |
477 | shm = idr_find(&teedev->idr, id); | |
478 | if (!shm || shm->ctx != ctx) | |
479 | shm = ERR_PTR(-EINVAL); | |
480 | else if (shm->flags & TEE_SHM_DMA_BUF) | |
481 | get_dma_buf(shm->dmabuf); | |
482 | mutex_unlock(&teedev->mutex); | |
483 | return shm; | |
484 | } | |
485 | EXPORT_SYMBOL_GPL(tee_shm_get_from_id); | |
486 | ||
967c9cca JW |
487 | /** |
488 | * tee_shm_put() - Decrease reference count on a shared memory handle | |
489 | * @shm: Shared memory handle | |
490 | */ | |
491 | void tee_shm_put(struct tee_shm *shm) | |
492 | { | |
493 | if (shm->flags & TEE_SHM_DMA_BUF) | |
494 | dma_buf_put(shm->dmabuf); | |
495 | } | |
496 | EXPORT_SYMBOL_GPL(tee_shm_put); |