1 // SPDX-License-Identifier: GPL-2.0-only
3 * Copyright (c) 2015-2016, Linaro Limited
5 #include <linux/device.h>
6 #include <linux/dma-buf.h>
7 #include <linux/fdtable.h>
9 #include <linux/sched.h>
10 #include <linux/slab.h>
11 #include <linux/tee_drv.h>
12 #include <linux/uio.h>
13 #include "tee_private.h"
15 static void tee_shm_release(struct tee_shm *shm)
17 struct tee_device *teedev = shm->ctx->teedev;
19 if (shm->flags & TEE_SHM_DMA_BUF) {
20 mutex_lock(&teedev->mutex);
21 idr_remove(&teedev->idr, shm->id);
22 mutex_unlock(&teedev->mutex);
25 if (shm->flags & TEE_SHM_POOL) {
26 struct tee_shm_pool_mgr *poolm;
28 if (shm->flags & TEE_SHM_DMA_BUF)
29 poolm = teedev->pool->dma_buf_mgr;
31 poolm = teedev->pool->private_mgr;
33 poolm->ops->free(poolm, shm);
34 } else if (shm->flags & TEE_SHM_REGISTER) {
36 int rc = teedev->desc->ops->shm_unregister(shm->ctx, shm);
39 dev_err(teedev->dev.parent,
40 "unregister shm %p failed: %d", shm, rc);
42 for (n = 0; n < shm->num_pages; n++)
43 put_page(shm->pages[n]);
48 teedev_ctx_put(shm->ctx);
52 tee_device_put(teedev);
55 static struct sg_table *tee_shm_op_map_dma_buf(struct dma_buf_attachment
56 *attach, enum dma_data_direction dir)
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)
67 static void tee_shm_op_release(struct dma_buf *dmabuf)
69 struct tee_shm *shm = dmabuf->priv;
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 /* Refuse sharing shared memory provided by application */
80 if (shm->flags & TEE_SHM_USER_MAPPED)
83 return remap_pfn_range(vma, vma->vm_start, shm->paddr >> PAGE_SHIFT,
84 size, vma->vm_page_prot);
87 static const struct dma_buf_ops tee_shm_dma_buf_ops = {
88 .map_dma_buf = tee_shm_op_map_dma_buf,
89 .unmap_dma_buf = tee_shm_op_unmap_dma_buf,
90 .release = tee_shm_op_release,
91 .mmap = tee_shm_op_mmap,
94 struct tee_shm *tee_shm_alloc(struct tee_context *ctx, size_t size, u32 flags)
96 struct tee_device *teedev = ctx->teedev;
97 struct tee_shm_pool_mgr *poolm = NULL;
102 if (!(flags & TEE_SHM_MAPPED)) {
103 dev_err(teedev->dev.parent,
104 "only mapped allocations supported\n");
105 return ERR_PTR(-EINVAL);
108 if ((flags & ~(TEE_SHM_MAPPED | TEE_SHM_DMA_BUF))) {
109 dev_err(teedev->dev.parent, "invalid shm flags 0x%x", flags);
110 return ERR_PTR(-EINVAL);
113 if (!tee_device_get(teedev))
114 return ERR_PTR(-EINVAL);
117 /* teedev has been detached from driver */
118 ret = ERR_PTR(-EINVAL);
122 shm = kzalloc(sizeof(*shm), GFP_KERNEL);
124 ret = ERR_PTR(-ENOMEM);
128 shm->flags = flags | TEE_SHM_POOL;
130 if (flags & TEE_SHM_DMA_BUF)
131 poolm = teedev->pool->dma_buf_mgr;
133 poolm = teedev->pool->private_mgr;
135 rc = poolm->ops->alloc(poolm, shm, size);
142 if (flags & TEE_SHM_DMA_BUF) {
143 DEFINE_DMA_BUF_EXPORT_INFO(exp_info);
145 mutex_lock(&teedev->mutex);
146 shm->id = idr_alloc(&teedev->idr, shm, 1, 0, GFP_KERNEL);
147 mutex_unlock(&teedev->mutex);
149 ret = ERR_PTR(shm->id);
153 exp_info.ops = &tee_shm_dma_buf_ops;
154 exp_info.size = shm->size;
155 exp_info.flags = O_RDWR;
158 shm->dmabuf = dma_buf_export(&exp_info);
159 if (IS_ERR(shm->dmabuf)) {
160 ret = ERR_CAST(shm->dmabuf);
169 if (flags & TEE_SHM_DMA_BUF) {
170 mutex_lock(&teedev->mutex);
171 idr_remove(&teedev->idr, shm->id);
172 mutex_unlock(&teedev->mutex);
175 poolm->ops->free(poolm, shm);
179 tee_device_put(teedev);
182 EXPORT_SYMBOL_GPL(tee_shm_alloc);
184 struct tee_shm *tee_shm_register(struct tee_context *ctx, unsigned long addr,
185 size_t length, u32 flags)
187 struct tee_device *teedev = ctx->teedev;
188 const u32 req_user_flags = TEE_SHM_DMA_BUF | TEE_SHM_USER_MAPPED;
189 const u32 req_kernel_flags = TEE_SHM_DMA_BUF | TEE_SHM_KERNEL_MAPPED;
196 if (flags != req_user_flags && flags != req_kernel_flags)
197 return ERR_PTR(-ENOTSUPP);
199 if (!tee_device_get(teedev))
200 return ERR_PTR(-EINVAL);
202 if (!teedev->desc->ops->shm_register ||
203 !teedev->desc->ops->shm_unregister) {
204 tee_device_put(teedev);
205 return ERR_PTR(-ENOTSUPP);
210 shm = kzalloc(sizeof(*shm), GFP_KERNEL);
212 ret = ERR_PTR(-ENOMEM);
216 shm->flags = flags | TEE_SHM_REGISTER;
219 addr = untagged_addr(addr);
220 start = rounddown(addr, PAGE_SIZE);
221 shm->offset = addr - start;
223 num_pages = (roundup(addr + length, PAGE_SIZE) - start) / PAGE_SIZE;
224 shm->pages = kcalloc(num_pages, sizeof(*shm->pages), GFP_KERNEL);
226 ret = ERR_PTR(-ENOMEM);
230 if (flags & TEE_SHM_USER_MAPPED) {
231 rc = get_user_pages_fast(start, num_pages, FOLL_WRITE,
237 kiov = kcalloc(num_pages, sizeof(*kiov), GFP_KERNEL);
239 ret = ERR_PTR(-ENOMEM);
243 for (i = 0; i < num_pages; i++) {
244 kiov[i].iov_base = (void *)(start + i * PAGE_SIZE);
245 kiov[i].iov_len = PAGE_SIZE;
248 rc = get_kernel_pages(kiov, num_pages, 0, shm->pages);
253 if (rc != num_pages) {
260 mutex_lock(&teedev->mutex);
261 shm->id = idr_alloc(&teedev->idr, shm, 1, 0, GFP_KERNEL);
262 mutex_unlock(&teedev->mutex);
265 ret = ERR_PTR(shm->id);
269 rc = teedev->desc->ops->shm_register(ctx, shm, shm->pages,
270 shm->num_pages, start);
276 if (flags & TEE_SHM_DMA_BUF) {
277 DEFINE_DMA_BUF_EXPORT_INFO(exp_info);
279 exp_info.ops = &tee_shm_dma_buf_ops;
280 exp_info.size = shm->size;
281 exp_info.flags = O_RDWR;
284 shm->dmabuf = dma_buf_export(&exp_info);
285 if (IS_ERR(shm->dmabuf)) {
286 ret = ERR_CAST(shm->dmabuf);
287 teedev->desc->ops->shm_unregister(ctx, shm);
298 mutex_lock(&teedev->mutex);
299 idr_remove(&teedev->idr, shm->id);
300 mutex_unlock(&teedev->mutex);
303 for (n = 0; n < shm->num_pages; n++)
304 put_page(shm->pages[n]);
310 tee_device_put(teedev);
313 EXPORT_SYMBOL_GPL(tee_shm_register);
316 * tee_shm_get_fd() - Increase reference count and return file descriptor
317 * @shm: Shared memory handle
318 * @returns user space file descriptor to shared memory
320 int tee_shm_get_fd(struct tee_shm *shm)
324 if (!(shm->flags & TEE_SHM_DMA_BUF))
327 get_dma_buf(shm->dmabuf);
328 fd = dma_buf_fd(shm->dmabuf, O_CLOEXEC);
330 dma_buf_put(shm->dmabuf);
335 * tee_shm_free() - Free shared memory
336 * @shm: Handle to shared memory to free
338 void tee_shm_free(struct tee_shm *shm)
341 * dma_buf_put() decreases the dmabuf reference counter and will
342 * call tee_shm_release() when the last reference is gone.
344 * In the case of driver private memory we call tee_shm_release
345 * directly instead as it doesn't have a reference counter.
347 if (shm->flags & TEE_SHM_DMA_BUF)
348 dma_buf_put(shm->dmabuf);
350 tee_shm_release(shm);
352 EXPORT_SYMBOL_GPL(tee_shm_free);
355 * tee_shm_va2pa() - Get physical address of a virtual address
356 * @shm: Shared memory handle
357 * @va: Virtual address to tranlsate
358 * @pa: Returned physical address
359 * @returns 0 on success and < 0 on failure
361 int tee_shm_va2pa(struct tee_shm *shm, void *va, phys_addr_t *pa)
363 if (!(shm->flags & TEE_SHM_MAPPED))
365 /* Check that we're in the range of the shm */
366 if ((char *)va < (char *)shm->kaddr)
368 if ((char *)va >= ((char *)shm->kaddr + shm->size))
371 return tee_shm_get_pa(
372 shm, (unsigned long)va - (unsigned long)shm->kaddr, pa);
374 EXPORT_SYMBOL_GPL(tee_shm_va2pa);
377 * tee_shm_pa2va() - Get virtual address of a physical address
378 * @shm: Shared memory handle
379 * @pa: Physical address to tranlsate
380 * @va: Returned virtual address
381 * @returns 0 on success and < 0 on failure
383 int tee_shm_pa2va(struct tee_shm *shm, phys_addr_t pa, void **va)
385 if (!(shm->flags & TEE_SHM_MAPPED))
387 /* Check that we're in the range of the shm */
390 if (pa >= (shm->paddr + shm->size))
394 void *v = tee_shm_get_va(shm, pa - shm->paddr);
402 EXPORT_SYMBOL_GPL(tee_shm_pa2va);
405 * tee_shm_get_va() - Get virtual address of a shared memory plus an offset
406 * @shm: Shared memory handle
407 * @offs: Offset from start of this shared memory
408 * @returns virtual address of the shared memory + offs if offs is within
409 * the bounds of this shared memory, else an ERR_PTR
411 void *tee_shm_get_va(struct tee_shm *shm, size_t offs)
413 if (!(shm->flags & TEE_SHM_MAPPED))
414 return ERR_PTR(-EINVAL);
415 if (offs >= shm->size)
416 return ERR_PTR(-EINVAL);
417 return (char *)shm->kaddr + offs;
419 EXPORT_SYMBOL_GPL(tee_shm_get_va);
422 * tee_shm_get_pa() - Get physical address of a shared memory plus an offset
423 * @shm: Shared memory handle
424 * @offs: Offset from start of this shared memory
425 * @pa: Physical address to return
426 * @returns 0 if offs is within the bounds of this shared memory, else an
429 int tee_shm_get_pa(struct tee_shm *shm, size_t offs, phys_addr_t *pa)
431 if (offs >= shm->size)
434 *pa = shm->paddr + offs;
437 EXPORT_SYMBOL_GPL(tee_shm_get_pa);
440 * tee_shm_get_from_id() - Find shared memory object and increase reference
442 * @ctx: Context owning the shared memory
443 * @id: Id of shared memory object
444 * @returns a pointer to 'struct tee_shm' on success or an ERR_PTR on failure
446 struct tee_shm *tee_shm_get_from_id(struct tee_context *ctx, int id)
448 struct tee_device *teedev;
452 return ERR_PTR(-EINVAL);
454 teedev = ctx->teedev;
455 mutex_lock(&teedev->mutex);
456 shm = idr_find(&teedev->idr, id);
457 if (!shm || shm->ctx != ctx)
458 shm = ERR_PTR(-EINVAL);
459 else if (shm->flags & TEE_SHM_DMA_BUF)
460 get_dma_buf(shm->dmabuf);
461 mutex_unlock(&teedev->mutex);
464 EXPORT_SYMBOL_GPL(tee_shm_get_from_id);
467 * tee_shm_put() - Decrease reference count on a shared memory handle
468 * @shm: Shared memory handle
470 void tee_shm_put(struct tee_shm *shm)
472 if (shm->flags & TEE_SHM_DMA_BUF)
473 dma_buf_put(shm->dmabuf);
475 EXPORT_SYMBOL_GPL(tee_shm_put);