2 * Copyright (c) 2015-2016, Linaro Limited
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.
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.
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"
23 static void tee_shm_release(struct tee_shm *shm)
25 struct tee_device *teedev = shm->teedev;
27 mutex_lock(&teedev->mutex);
28 idr_remove(&teedev->idr, shm->id);
31 mutex_unlock(&teedev->mutex);
33 if (shm->flags & TEE_SHM_POOL) {
34 struct tee_shm_pool_mgr *poolm;
36 if (shm->flags & TEE_SHM_DMA_BUF)
37 poolm = teedev->pool->dma_buf_mgr;
39 poolm = teedev->pool->private_mgr;
41 poolm->ops->free(poolm, shm);
42 } else if (shm->flags & TEE_SHM_REGISTER) {
44 int rc = teedev->desc->ops->shm_unregister(shm->ctx, shm);
47 dev_err(teedev->dev.parent,
48 "unregister shm %p failed: %d", shm, rc);
50 for (n = 0; n < shm->num_pages; n++)
51 put_page(shm->pages[n]);
57 teedev_ctx_put(shm->ctx);
61 tee_device_put(teedev);
64 static struct sg_table *tee_shm_op_map_dma_buf(struct dma_buf_attachment
65 *attach, enum dma_data_direction dir)
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)
76 static void tee_shm_op_release(struct dma_buf *dmabuf)
78 struct tee_shm *shm = dmabuf->priv;
83 static void *tee_shm_op_map(struct dma_buf *dmabuf, unsigned long pgnum)
88 static int tee_shm_op_mmap(struct dma_buf *dmabuf, struct vm_area_struct *vma)
90 struct tee_shm *shm = dmabuf->priv;
91 size_t size = vma->vm_end - vma->vm_start;
93 /* Refuse sharing shared memory provided by application */
94 if (shm->flags & TEE_SHM_REGISTER)
97 return remap_pfn_range(vma, vma->vm_start, shm->paddr >> PAGE_SHIFT,
98 size, vma->vm_page_prot);
101 static const struct dma_buf_ops tee_shm_dma_buf_ops = {
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,
105 .map = tee_shm_op_map,
106 .mmap = tee_shm_op_mmap,
109 static struct tee_shm *__tee_shm_alloc(struct tee_context *ctx,
110 struct tee_device *teedev,
111 size_t size, u32 flags)
113 struct tee_shm_pool_mgr *poolm = NULL;
118 if (ctx && ctx->teedev != teedev) {
119 dev_err(teedev->dev.parent, "ctx and teedev mismatch\n");
120 return ERR_PTR(-EINVAL);
123 if (!(flags & TEE_SHM_MAPPED)) {
124 dev_err(teedev->dev.parent,
125 "only mapped allocations supported\n");
126 return ERR_PTR(-EINVAL);
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);
134 if (!tee_device_get(teedev))
135 return ERR_PTR(-EINVAL);
138 /* teedev has been detached from driver */
139 ret = ERR_PTR(-EINVAL);
143 shm = kzalloc(sizeof(*shm), GFP_KERNEL);
145 ret = ERR_PTR(-ENOMEM);
149 shm->flags = flags | TEE_SHM_POOL;
150 shm->teedev = teedev;
152 if (flags & TEE_SHM_DMA_BUF)
153 poolm = teedev->pool->dma_buf_mgr;
155 poolm = teedev->pool->private_mgr;
157 rc = poolm->ops->alloc(poolm, shm, size);
163 mutex_lock(&teedev->mutex);
164 shm->id = idr_alloc(&teedev->idr, shm, 1, 0, GFP_KERNEL);
165 mutex_unlock(&teedev->mutex);
167 ret = ERR_PTR(shm->id);
171 if (flags & TEE_SHM_DMA_BUF) {
172 DEFINE_DMA_BUF_EXPORT_INFO(exp_info);
174 exp_info.ops = &tee_shm_dma_buf_ops;
175 exp_info.size = shm->size;
176 exp_info.flags = O_RDWR;
179 shm->dmabuf = dma_buf_export(&exp_info);
180 if (IS_ERR(shm->dmabuf)) {
181 ret = ERR_CAST(shm->dmabuf);
188 mutex_lock(&teedev->mutex);
189 list_add_tail(&shm->link, &ctx->list_shm);
190 mutex_unlock(&teedev->mutex);
195 mutex_lock(&teedev->mutex);
196 idr_remove(&teedev->idr, shm->id);
197 mutex_unlock(&teedev->mutex);
199 poolm->ops->free(poolm, shm);
203 tee_device_put(teedev);
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.
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.
219 struct tee_shm *tee_shm_alloc(struct tee_context *ctx, size_t size, u32 flags)
221 return __tee_shm_alloc(ctx, ctx->teedev, size, flags);
223 EXPORT_SYMBOL_GPL(tee_shm_alloc);
225 struct tee_shm *tee_shm_priv_alloc(struct tee_device *teedev, size_t size)
227 return __tee_shm_alloc(NULL, teedev, size, TEE_SHM_MAPPED);
229 EXPORT_SYMBOL_GPL(tee_shm_priv_alloc);
231 struct tee_shm *tee_shm_register(struct tee_context *ctx, unsigned long addr,
232 size_t length, u32 flags)
234 struct tee_device *teedev = ctx->teedev;
235 const u32 req_flags = TEE_SHM_DMA_BUF | TEE_SHM_USER_MAPPED;
242 if (flags != req_flags)
243 return ERR_PTR(-ENOTSUPP);
245 if (!tee_device_get(teedev))
246 return ERR_PTR(-EINVAL);
248 if (!teedev->desc->ops->shm_register ||
249 !teedev->desc->ops->shm_unregister) {
250 tee_device_put(teedev);
251 return ERR_PTR(-ENOTSUPP);
256 shm = kzalloc(sizeof(*shm), GFP_KERNEL);
258 ret = ERR_PTR(-ENOMEM);
262 shm->flags = flags | TEE_SHM_REGISTER;
263 shm->teedev = teedev;
266 start = rounddown(addr, PAGE_SIZE);
267 shm->offset = addr - start;
269 num_pages = (roundup(addr + length, PAGE_SIZE) - start) / PAGE_SIZE;
270 shm->pages = kcalloc(num_pages, sizeof(*shm->pages), GFP_KERNEL);
272 ret = ERR_PTR(-ENOMEM);
276 rc = get_user_pages_fast(start, num_pages, 1, shm->pages);
279 if (rc != num_pages) {
286 mutex_lock(&teedev->mutex);
287 shm->id = idr_alloc(&teedev->idr, shm, 1, 0, GFP_KERNEL);
288 mutex_unlock(&teedev->mutex);
291 ret = ERR_PTR(shm->id);
295 rc = teedev->desc->ops->shm_register(ctx, shm, shm->pages,
296 shm->num_pages, start);
302 if (flags & TEE_SHM_DMA_BUF) {
303 DEFINE_DMA_BUF_EXPORT_INFO(exp_info);
305 exp_info.ops = &tee_shm_dma_buf_ops;
306 exp_info.size = shm->size;
307 exp_info.flags = O_RDWR;
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);
318 mutex_lock(&teedev->mutex);
319 list_add_tail(&shm->link, &ctx->list_shm);
320 mutex_unlock(&teedev->mutex);
328 mutex_lock(&teedev->mutex);
329 idr_remove(&teedev->idr, shm->id);
330 mutex_unlock(&teedev->mutex);
333 for (n = 0; n < shm->num_pages; n++)
334 put_page(shm->pages[n]);
340 tee_device_put(teedev);
343 EXPORT_SYMBOL_GPL(tee_shm_register);
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
350 int tee_shm_get_fd(struct tee_shm *shm)
354 if (!(shm->flags & TEE_SHM_DMA_BUF))
357 get_dma_buf(shm->dmabuf);
358 fd = dma_buf_fd(shm->dmabuf, O_CLOEXEC);
360 dma_buf_put(shm->dmabuf);
365 * tee_shm_free() - Free shared memory
366 * @shm: Handle to shared memory to free
368 void tee_shm_free(struct tee_shm *shm)
371 * dma_buf_put() decreases the dmabuf reference counter and will
372 * call tee_shm_release() when the last reference is gone.
374 * In the case of driver private memory we call tee_shm_release
375 * directly instead as it doesn't have a reference counter.
377 if (shm->flags & TEE_SHM_DMA_BUF)
378 dma_buf_put(shm->dmabuf);
380 tee_shm_release(shm);
382 EXPORT_SYMBOL_GPL(tee_shm_free);
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
391 int tee_shm_va2pa(struct tee_shm *shm, void *va, phys_addr_t *pa)
393 if (!(shm->flags & TEE_SHM_MAPPED))
395 /* Check that we're in the range of the shm */
396 if ((char *)va < (char *)shm->kaddr)
398 if ((char *)va >= ((char *)shm->kaddr + shm->size))
401 return tee_shm_get_pa(
402 shm, (unsigned long)va - (unsigned long)shm->kaddr, pa);
404 EXPORT_SYMBOL_GPL(tee_shm_va2pa);
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
413 int tee_shm_pa2va(struct tee_shm *shm, phys_addr_t pa, void **va)
415 if (!(shm->flags & TEE_SHM_MAPPED))
417 /* Check that we're in the range of the shm */
420 if (pa >= (shm->paddr + shm->size))
424 void *v = tee_shm_get_va(shm, pa - shm->paddr);
432 EXPORT_SYMBOL_GPL(tee_shm_pa2va);
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
441 void *tee_shm_get_va(struct tee_shm *shm, size_t offs)
443 if (!(shm->flags & TEE_SHM_MAPPED))
444 return ERR_PTR(-EINVAL);
445 if (offs >= shm->size)
446 return ERR_PTR(-EINVAL);
447 return (char *)shm->kaddr + offs;
449 EXPORT_SYMBOL_GPL(tee_shm_get_va);
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
459 int tee_shm_get_pa(struct tee_shm *shm, size_t offs, phys_addr_t *pa)
461 if (offs >= shm->size)
464 *pa = shm->paddr + offs;
467 EXPORT_SYMBOL_GPL(tee_shm_get_pa);
470 * tee_shm_get_from_id() - Find shared memory object and increase reference
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
476 struct tee_shm *tee_shm_get_from_id(struct tee_context *ctx, int id)
478 struct tee_device *teedev;
482 return ERR_PTR(-EINVAL);
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);
494 EXPORT_SYMBOL_GPL(tee_shm_get_from_id);
497 * tee_shm_put() - Decrease reference count on a shared memory handle
498 * @shm: Shared memory handle
500 void tee_shm_put(struct tee_shm *shm)
502 if (shm->flags & TEE_SHM_DMA_BUF)
503 dma_buf_put(shm->dmabuf);
505 EXPORT_SYMBOL_GPL(tee_shm_put);