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;
26 struct tee_shm_pool_mgr *poolm;
28 mutex_lock(&teedev->mutex);
29 idr_remove(&teedev->idr, shm->id);
32 mutex_unlock(&teedev->mutex);
34 if (shm->flags & TEE_SHM_DMA_BUF)
35 poolm = &teedev->pool->dma_buf_mgr;
37 poolm = &teedev->pool->private_mgr;
39 poolm->ops->free(poolm, shm);
42 tee_device_put(teedev);
45 static struct sg_table *tee_shm_op_map_dma_buf(struct dma_buf_attachment
46 *attach, enum dma_data_direction dir)
51 static void tee_shm_op_unmap_dma_buf(struct dma_buf_attachment *attach,
52 struct sg_table *table,
53 enum dma_data_direction dir)
57 static void tee_shm_op_release(struct dma_buf *dmabuf)
59 struct tee_shm *shm = dmabuf->priv;
64 static void *tee_shm_op_map_atomic(struct dma_buf *dmabuf, unsigned long pgnum)
69 static void *tee_shm_op_map(struct dma_buf *dmabuf, unsigned long pgnum)
74 static int tee_shm_op_mmap(struct dma_buf *dmabuf, struct vm_area_struct *vma)
76 struct tee_shm *shm = dmabuf->priv;
77 size_t size = vma->vm_end - vma->vm_start;
79 return remap_pfn_range(vma, vma->vm_start, shm->paddr >> PAGE_SHIFT,
80 size, vma->vm_page_prot);
83 static struct dma_buf_ops tee_shm_dma_buf_ops = {
84 .map_dma_buf = tee_shm_op_map_dma_buf,
85 .unmap_dma_buf = tee_shm_op_unmap_dma_buf,
86 .release = tee_shm_op_release,
87 .map_atomic = tee_shm_op_map_atomic,
88 .map = tee_shm_op_map,
89 .mmap = tee_shm_op_mmap,
93 * tee_shm_alloc() - Allocate shared memory
94 * @ctx: Context that allocates the shared memory
95 * @size: Requested size of shared memory
96 * @flags: Flags setting properties for the requested shared memory.
98 * Memory allocated as global shared memory is automatically freed when the
99 * TEE file pointer is closed. The @flags field uses the bits defined by
100 * TEE_SHM_* in <linux/tee_drv.h>. TEE_SHM_MAPPED must currently always be
101 * set. If TEE_SHM_DMA_BUF global shared memory will be allocated and
102 * associated with a dma-buf handle, else driver private memory.
104 struct tee_shm *tee_shm_alloc(struct tee_context *ctx, size_t size, u32 flags)
106 struct tee_device *teedev = ctx->teedev;
107 struct tee_shm_pool_mgr *poolm = NULL;
112 if (!(flags & TEE_SHM_MAPPED)) {
113 dev_err(teedev->dev.parent,
114 "only mapped allocations supported\n");
115 return ERR_PTR(-EINVAL);
118 if ((flags & ~(TEE_SHM_MAPPED | TEE_SHM_DMA_BUF))) {
119 dev_err(teedev->dev.parent, "invalid shm flags 0x%x", flags);
120 return ERR_PTR(-EINVAL);
123 if (!tee_device_get(teedev))
124 return ERR_PTR(-EINVAL);
127 /* teedev has been detached from driver */
128 ret = ERR_PTR(-EINVAL);
132 shm = kzalloc(sizeof(*shm), GFP_KERNEL);
134 ret = ERR_PTR(-ENOMEM);
139 shm->teedev = teedev;
141 if (flags & TEE_SHM_DMA_BUF)
142 poolm = &teedev->pool->dma_buf_mgr;
144 poolm = &teedev->pool->private_mgr;
146 rc = poolm->ops->alloc(poolm, shm, size);
152 mutex_lock(&teedev->mutex);
153 shm->id = idr_alloc(&teedev->idr, shm, 1, 0, GFP_KERNEL);
154 mutex_unlock(&teedev->mutex);
156 ret = ERR_PTR(shm->id);
160 if (flags & TEE_SHM_DMA_BUF) {
161 DEFINE_DMA_BUF_EXPORT_INFO(exp_info);
163 exp_info.ops = &tee_shm_dma_buf_ops;
164 exp_info.size = shm->size;
165 exp_info.flags = O_RDWR;
168 shm->dmabuf = dma_buf_export(&exp_info);
169 if (IS_ERR(shm->dmabuf)) {
170 ret = ERR_CAST(shm->dmabuf);
174 mutex_lock(&teedev->mutex);
175 list_add_tail(&shm->link, &ctx->list_shm);
176 mutex_unlock(&teedev->mutex);
180 mutex_lock(&teedev->mutex);
181 idr_remove(&teedev->idr, shm->id);
182 mutex_unlock(&teedev->mutex);
184 poolm->ops->free(poolm, shm);
188 tee_device_put(teedev);
191 EXPORT_SYMBOL_GPL(tee_shm_alloc);
194 * tee_shm_get_fd() - Increase reference count and return file descriptor
195 * @shm: Shared memory handle
196 * @returns user space file descriptor to shared memory
198 int tee_shm_get_fd(struct tee_shm *shm)
200 u32 req_flags = TEE_SHM_MAPPED | TEE_SHM_DMA_BUF;
203 if ((shm->flags & req_flags) != req_flags)
206 fd = dma_buf_fd(shm->dmabuf, O_CLOEXEC);
208 get_dma_buf(shm->dmabuf);
213 * tee_shm_free() - Free shared memory
214 * @shm: Handle to shared memory to free
216 void tee_shm_free(struct tee_shm *shm)
219 * dma_buf_put() decreases the dmabuf reference counter and will
220 * call tee_shm_release() when the last reference is gone.
222 * In the case of driver private memory we call tee_shm_release
223 * directly instead as it doesn't have a reference counter.
225 if (shm->flags & TEE_SHM_DMA_BUF)
226 dma_buf_put(shm->dmabuf);
228 tee_shm_release(shm);
230 EXPORT_SYMBOL_GPL(tee_shm_free);
233 * tee_shm_va2pa() - Get physical address of a virtual address
234 * @shm: Shared memory handle
235 * @va: Virtual address to tranlsate
236 * @pa: Returned physical address
237 * @returns 0 on success and < 0 on failure
239 int tee_shm_va2pa(struct tee_shm *shm, void *va, phys_addr_t *pa)
241 /* Check that we're in the range of the shm */
242 if ((char *)va < (char *)shm->kaddr)
244 if ((char *)va >= ((char *)shm->kaddr + shm->size))
247 return tee_shm_get_pa(
248 shm, (unsigned long)va - (unsigned long)shm->kaddr, pa);
250 EXPORT_SYMBOL_GPL(tee_shm_va2pa);
253 * tee_shm_pa2va() - Get virtual address of a physical address
254 * @shm: Shared memory handle
255 * @pa: Physical address to tranlsate
256 * @va: Returned virtual address
257 * @returns 0 on success and < 0 on failure
259 int tee_shm_pa2va(struct tee_shm *shm, phys_addr_t pa, void **va)
261 /* Check that we're in the range of the shm */
264 if (pa >= (shm->paddr + shm->size))
268 void *v = tee_shm_get_va(shm, pa - shm->paddr);
276 EXPORT_SYMBOL_GPL(tee_shm_pa2va);
279 * tee_shm_get_va() - Get virtual address of a shared memory plus an offset
280 * @shm: Shared memory handle
281 * @offs: Offset from start of this shared memory
282 * @returns virtual address of the shared memory + offs if offs is within
283 * the bounds of this shared memory, else an ERR_PTR
285 void *tee_shm_get_va(struct tee_shm *shm, size_t offs)
287 if (offs >= shm->size)
288 return ERR_PTR(-EINVAL);
289 return (char *)shm->kaddr + offs;
291 EXPORT_SYMBOL_GPL(tee_shm_get_va);
294 * tee_shm_get_pa() - Get physical address of a shared memory plus an offset
295 * @shm: Shared memory handle
296 * @offs: Offset from start of this shared memory
297 * @pa: Physical address to return
298 * @returns 0 if offs is within the bounds of this shared memory, else an
301 int tee_shm_get_pa(struct tee_shm *shm, size_t offs, phys_addr_t *pa)
303 if (offs >= shm->size)
306 *pa = shm->paddr + offs;
309 EXPORT_SYMBOL_GPL(tee_shm_get_pa);
312 * tee_shm_get_from_id() - Find shared memory object and increase reference
314 * @ctx: Context owning the shared memory
315 * @id: Id of shared memory object
316 * @returns a pointer to 'struct tee_shm' on success or an ERR_PTR on failure
318 struct tee_shm *tee_shm_get_from_id(struct tee_context *ctx, int id)
320 struct tee_device *teedev;
324 return ERR_PTR(-EINVAL);
326 teedev = ctx->teedev;
327 mutex_lock(&teedev->mutex);
328 shm = idr_find(&teedev->idr, id);
329 if (!shm || shm->ctx != ctx)
330 shm = ERR_PTR(-EINVAL);
331 else if (shm->flags & TEE_SHM_DMA_BUF)
332 get_dma_buf(shm->dmabuf);
333 mutex_unlock(&teedev->mutex);
336 EXPORT_SYMBOL_GPL(tee_shm_get_from_id);
339 * tee_shm_get_id() - Get id of a shared memory object
340 * @shm: Shared memory handle
343 int tee_shm_get_id(struct tee_shm *shm)
347 EXPORT_SYMBOL_GPL(tee_shm_get_id);
350 * tee_shm_put() - Decrease reference count on a shared memory handle
351 * @shm: Shared memory handle
353 void tee_shm_put(struct tee_shm *shm)
355 if (shm->flags & TEE_SHM_DMA_BUF)
356 dma_buf_put(shm->dmabuf);
358 EXPORT_SYMBOL_GPL(tee_shm_put);