diff options
Diffstat (limited to 'drivers/tee/tee_shm.c')
| -rw-r--r-- | drivers/tee/tee_shm.c | 165 |
1 files changed, 161 insertions, 4 deletions
diff --git a/drivers/tee/tee_shm.c b/drivers/tee/tee_shm.c index 2a7d253d9c55..4a47de4bb2e5 100644 --- a/drivers/tee/tee_shm.c +++ b/drivers/tee/tee_shm.c @@ -4,6 +4,9 @@ */ #include <linux/anon_inodes.h> #include <linux/device.h> +#include <linux/dma-buf.h> +#include <linux/dma-mapping.h> +#include <linux/highmem.h> #include <linux/idr.h> #include <linux/io.h> #include <linux/mm.h> @@ -12,9 +15,14 @@ #include <linux/tee_core.h> #include <linux/uaccess.h> #include <linux/uio.h> -#include <linux/highmem.h> #include "tee_private.h" +struct tee_shm_dma_mem { + struct tee_shm shm; + dma_addr_t dma_addr; + struct page *page; +}; + static void shm_put_kernel_pages(struct page **pages, size_t page_count) { size_t n; @@ -45,7 +53,24 @@ static void release_registered_pages(struct tee_shm *shm) static void tee_shm_release(struct tee_device *teedev, struct tee_shm *shm) { - if (shm->flags & TEE_SHM_POOL) { + void *p = shm; + + if (shm->flags & TEE_SHM_DMA_MEM) { +#if IS_ENABLED(CONFIG_TEE_DMABUF_HEAPS) + struct tee_shm_dma_mem *dma_mem; + + dma_mem = container_of(shm, struct tee_shm_dma_mem, shm); + p = dma_mem; + dma_free_pages(&teedev->dev, shm->size, dma_mem->page, + dma_mem->dma_addr, DMA_BIDIRECTIONAL); +#endif + } else if (shm->flags & TEE_SHM_DMA_BUF) { + struct tee_shm_dmabuf_ref *ref; + + ref = container_of(shm, struct tee_shm_dmabuf_ref, shm); + p = ref; + dma_buf_put(ref->dmabuf); + } else if (shm->flags & TEE_SHM_POOL) { teedev->pool->ops->free(teedev->pool, shm); } else if (shm->flags & TEE_SHM_DYNAMIC) { int rc = teedev->desc->ops->shm_unregister(shm->ctx, shm); @@ -59,7 +84,7 @@ static void tee_shm_release(struct tee_device *teedev, struct tee_shm *shm) teedev_ctx_put(shm->ctx); - kfree(shm); + kfree(p); tee_device_put(teedev); } @@ -169,7 +194,7 @@ struct tee_shm *tee_shm_alloc_user_buf(struct tee_context *ctx, size_t size) * tee_client_invoke_func(). The memory allocated is later freed with a * call to tee_shm_free(). * - * @returns a pointer to 'struct tee_shm' + * @returns a pointer to 'struct tee_shm' on success, and ERR_PTR on failure */ struct tee_shm *tee_shm_alloc_kernel_buf(struct tee_context *ctx, size_t size) { @@ -179,6 +204,62 @@ struct tee_shm *tee_shm_alloc_kernel_buf(struct tee_context *ctx, size_t size) } EXPORT_SYMBOL_GPL(tee_shm_alloc_kernel_buf); +struct tee_shm *tee_shm_register_fd(struct tee_context *ctx, int fd) +{ + struct tee_shm_dmabuf_ref *ref; + int rc; + + if (!tee_device_get(ctx->teedev)) + return ERR_PTR(-EINVAL); + + teedev_ctx_get(ctx); + + ref = kzalloc(sizeof(*ref), GFP_KERNEL); + if (!ref) { + rc = -ENOMEM; + goto err_put_tee; + } + + refcount_set(&ref->shm.refcount, 1); + ref->shm.ctx = ctx; + ref->shm.id = -1; + ref->shm.flags = TEE_SHM_DMA_BUF; + + ref->dmabuf = dma_buf_get(fd); + if (IS_ERR(ref->dmabuf)) { + rc = PTR_ERR(ref->dmabuf); + goto err_kfree_ref; + } + + rc = tee_heap_update_from_dma_buf(ctx->teedev, ref->dmabuf, + &ref->offset, &ref->shm, + &ref->parent_shm); + if (rc) + goto err_put_dmabuf; + + mutex_lock(&ref->shm.ctx->teedev->mutex); + ref->shm.id = idr_alloc(&ref->shm.ctx->teedev->idr, &ref->shm, + 1, 0, GFP_KERNEL); + mutex_unlock(&ref->shm.ctx->teedev->mutex); + if (ref->shm.id < 0) { + rc = ref->shm.id; + goto err_put_dmabuf; + } + + return &ref->shm; + +err_put_dmabuf: + dma_buf_put(ref->dmabuf); +err_kfree_ref: + kfree(ref); +err_put_tee: + teedev_ctx_put(ctx); + tee_device_put(ctx->teedev); + + return ERR_PTR(rc); +} +EXPORT_SYMBOL_GPL(tee_shm_register_fd); + /** * tee_shm_alloc_priv_buf() - Allocate shared memory for a privately shared * kernel buffer @@ -203,6 +284,71 @@ struct tee_shm *tee_shm_alloc_priv_buf(struct tee_context *ctx, size_t size) } EXPORT_SYMBOL_GPL(tee_shm_alloc_priv_buf); +#if IS_ENABLED(CONFIG_TEE_DMABUF_HEAPS) +/** + * tee_shm_alloc_dma_mem() - Allocate DMA memory as shared memory object + * @ctx: Context that allocates the shared memory + * @page_count: Number of pages + * + * The allocated memory is expected to be lent (made inaccessible to the + * kernel) to the TEE while it's used and returned (accessible to the + * kernel again) before it's freed. + * + * This function should normally only be used internally in the TEE + * drivers. + * + * @returns a pointer to 'struct tee_shm' + */ +struct tee_shm *tee_shm_alloc_dma_mem(struct tee_context *ctx, + size_t page_count) +{ + struct tee_device *teedev = ctx->teedev; + struct tee_shm_dma_mem *dma_mem; + dma_addr_t dma_addr; + struct page *page; + + if (!tee_device_get(teedev)) + return ERR_PTR(-EINVAL); + + page = dma_alloc_pages(&teedev->dev, page_count * PAGE_SIZE, + &dma_addr, DMA_BIDIRECTIONAL, GFP_KERNEL); + if (!page) + goto err_put_teedev; + + dma_mem = kzalloc(sizeof(*dma_mem), GFP_KERNEL); + if (!dma_mem) + goto err_free_pages; + + refcount_set(&dma_mem->shm.refcount, 1); + dma_mem->shm.ctx = ctx; + dma_mem->shm.paddr = page_to_phys(page); + dma_mem->dma_addr = dma_addr; + dma_mem->page = page; + dma_mem->shm.size = page_count * PAGE_SIZE; + dma_mem->shm.flags = TEE_SHM_DMA_MEM; + + teedev_ctx_get(ctx); + + return &dma_mem->shm; + +err_free_pages: + dma_free_pages(&teedev->dev, page_count * PAGE_SIZE, page, dma_addr, + DMA_BIDIRECTIONAL); +err_put_teedev: + tee_device_put(teedev); + + return ERR_PTR(-ENOMEM); +} +EXPORT_SYMBOL_GPL(tee_shm_alloc_dma_mem); +#else +struct tee_shm *tee_shm_alloc_dma_mem(struct tee_context *ctx, + size_t page_count) +{ + return ERR_PTR(-EINVAL); +} +EXPORT_SYMBOL_GPL(tee_shm_alloc_dma_mem); +#endif + int tee_dyn_shm_alloc_helper(struct tee_shm *shm, size_t size, size_t align, int (*shm_register)(struct tee_context *ctx, struct tee_shm *shm, @@ -321,6 +467,14 @@ register_shm_helper(struct tee_context *ctx, struct iov_iter *iter, u32 flags, if (unlikely(len <= 0)) { ret = len ? ERR_PTR(len) : ERR_PTR(-ENOMEM); goto err_free_shm_pages; + } else if (DIV_ROUND_UP(len + off, PAGE_SIZE) != num_pages) { + /* + * If we only got a few pages, update to release the + * correct amount below. + */ + shm->num_pages = len / PAGE_SIZE; + ret = ERR_PTR(-ENOMEM); + goto err_put_shm_pages; } /* @@ -444,6 +598,9 @@ static int tee_shm_fop_mmap(struct file *filp, struct vm_area_struct *vma) /* Refuse sharing shared memory provided by application */ if (shm->flags & TEE_SHM_USER_MAPPED) return -EINVAL; + /* Refuse sharing registered DMA_bufs with the application */ + if (shm->flags & TEE_SHM_DMA_BUF) + return -EINVAL; /* check for overflowing the buffer's size */ if (vma->vm_pgoff + vma_pages(vma) > shm->size >> PAGE_SHIFT) |