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499 lines
12 KiB
499 lines
12 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* Copyright (c) 2015-2016, Linaro Limited |
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*/ |
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#include <linux/device.h> |
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#include <linux/dma-buf.h> |
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#include <linux/fdtable.h> |
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#include <linux/idr.h> |
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#include <linux/sched.h> |
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#include <linux/slab.h> |
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#include <linux/tee_drv.h> |
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#include <linux/uio.h> |
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#include "tee_private.h" |
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static void release_registered_pages(struct tee_shm *shm) |
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{ |
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if (shm->pages) { |
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if (shm->flags & TEE_SHM_USER_MAPPED) { |
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unpin_user_pages(shm->pages, shm->num_pages); |
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} else { |
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size_t n; |
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for (n = 0; n < shm->num_pages; n++) |
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put_page(shm->pages[n]); |
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} |
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kfree(shm->pages); |
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} |
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} |
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static void tee_shm_release(struct tee_shm *shm) |
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{ |
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struct tee_device *teedev = shm->ctx->teedev; |
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if (shm->flags & TEE_SHM_DMA_BUF) { |
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mutex_lock(&teedev->mutex); |
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idr_remove(&teedev->idr, shm->id); |
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mutex_unlock(&teedev->mutex); |
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} |
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if (shm->flags & TEE_SHM_POOL) { |
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struct tee_shm_pool_mgr *poolm; |
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if (shm->flags & TEE_SHM_DMA_BUF) |
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poolm = teedev->pool->dma_buf_mgr; |
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else |
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poolm = teedev->pool->private_mgr; |
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poolm->ops->free(poolm, shm); |
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} else if (shm->flags & TEE_SHM_REGISTER) { |
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int rc = teedev->desc->ops->shm_unregister(shm->ctx, shm); |
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if (rc) |
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dev_err(teedev->dev.parent, |
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"unregister shm %p failed: %d", shm, rc); |
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release_registered_pages(shm); |
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} |
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teedev_ctx_put(shm->ctx); |
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kfree(shm); |
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tee_device_put(teedev); |
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} |
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static struct sg_table *tee_shm_op_map_dma_buf(struct dma_buf_attachment |
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*attach, enum dma_data_direction dir) |
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{ |
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return NULL; |
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} |
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static void tee_shm_op_unmap_dma_buf(struct dma_buf_attachment *attach, |
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struct sg_table *table, |
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enum dma_data_direction dir) |
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{ |
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} |
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static void tee_shm_op_release(struct dma_buf *dmabuf) |
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{ |
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struct tee_shm *shm = dmabuf->priv; |
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tee_shm_release(shm); |
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} |
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static int tee_shm_op_mmap(struct dma_buf *dmabuf, struct vm_area_struct *vma) |
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{ |
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struct tee_shm *shm = dmabuf->priv; |
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size_t size = vma->vm_end - vma->vm_start; |
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/* Refuse sharing shared memory provided by application */ |
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if (shm->flags & TEE_SHM_USER_MAPPED) |
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return -EINVAL; |
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return remap_pfn_range(vma, vma->vm_start, shm->paddr >> PAGE_SHIFT, |
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size, vma->vm_page_prot); |
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} |
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static const struct dma_buf_ops tee_shm_dma_buf_ops = { |
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.map_dma_buf = tee_shm_op_map_dma_buf, |
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.unmap_dma_buf = tee_shm_op_unmap_dma_buf, |
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.release = tee_shm_op_release, |
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.mmap = tee_shm_op_mmap, |
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}; |
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struct tee_shm *tee_shm_alloc(struct tee_context *ctx, size_t size, u32 flags) |
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{ |
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struct tee_device *teedev = ctx->teedev; |
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struct tee_shm_pool_mgr *poolm = NULL; |
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struct tee_shm *shm; |
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void *ret; |
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int rc; |
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if (!(flags & TEE_SHM_MAPPED)) { |
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dev_err(teedev->dev.parent, |
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"only mapped allocations supported\n"); |
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return ERR_PTR(-EINVAL); |
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} |
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if ((flags & ~(TEE_SHM_MAPPED | TEE_SHM_DMA_BUF | TEE_SHM_PRIV))) { |
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dev_err(teedev->dev.parent, "invalid shm flags 0x%x", flags); |
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return ERR_PTR(-EINVAL); |
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} |
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if (!tee_device_get(teedev)) |
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return ERR_PTR(-EINVAL); |
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if (!teedev->pool) { |
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/* teedev has been detached from driver */ |
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ret = ERR_PTR(-EINVAL); |
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goto err_dev_put; |
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} |
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shm = kzalloc(sizeof(*shm), GFP_KERNEL); |
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if (!shm) { |
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ret = ERR_PTR(-ENOMEM); |
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goto err_dev_put; |
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} |
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shm->flags = flags | TEE_SHM_POOL; |
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shm->ctx = ctx; |
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if (flags & TEE_SHM_DMA_BUF) |
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poolm = teedev->pool->dma_buf_mgr; |
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else |
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poolm = teedev->pool->private_mgr; |
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rc = poolm->ops->alloc(poolm, shm, size); |
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if (rc) { |
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ret = ERR_PTR(rc); |
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goto err_kfree; |
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} |
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if (flags & TEE_SHM_DMA_BUF) { |
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DEFINE_DMA_BUF_EXPORT_INFO(exp_info); |
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mutex_lock(&teedev->mutex); |
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shm->id = idr_alloc(&teedev->idr, shm, 1, 0, GFP_KERNEL); |
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mutex_unlock(&teedev->mutex); |
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if (shm->id < 0) { |
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ret = ERR_PTR(shm->id); |
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goto err_pool_free; |
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} |
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exp_info.ops = &tee_shm_dma_buf_ops; |
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exp_info.size = shm->size; |
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exp_info.flags = O_RDWR; |
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exp_info.priv = shm; |
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shm->dmabuf = dma_buf_export(&exp_info); |
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if (IS_ERR(shm->dmabuf)) { |
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ret = ERR_CAST(shm->dmabuf); |
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goto err_rem; |
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} |
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} |
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teedev_ctx_get(ctx); |
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return shm; |
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err_rem: |
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if (flags & TEE_SHM_DMA_BUF) { |
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mutex_lock(&teedev->mutex); |
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idr_remove(&teedev->idr, shm->id); |
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mutex_unlock(&teedev->mutex); |
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} |
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err_pool_free: |
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poolm->ops->free(poolm, shm); |
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err_kfree: |
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kfree(shm); |
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err_dev_put: |
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tee_device_put(teedev); |
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return ret; |
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} |
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EXPORT_SYMBOL_GPL(tee_shm_alloc); |
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/** |
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* tee_shm_alloc_kernel_buf() - Allocate shared memory for kernel buffer |
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* @ctx: Context that allocates the shared memory |
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* @size: Requested size of shared memory |
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* |
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* The returned memory registered in secure world and is suitable to be |
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* passed as a memory buffer in parameter argument to |
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* tee_client_invoke_func(). The memory allocated is later freed with a |
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* call to tee_shm_free(). |
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* |
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* @returns a pointer to 'struct tee_shm' |
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*/ |
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struct tee_shm *tee_shm_alloc_kernel_buf(struct tee_context *ctx, size_t size) |
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{ |
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return tee_shm_alloc(ctx, size, TEE_SHM_MAPPED); |
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} |
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EXPORT_SYMBOL_GPL(tee_shm_alloc_kernel_buf); |
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struct tee_shm *tee_shm_register(struct tee_context *ctx, unsigned long addr, |
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size_t length, u32 flags) |
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{ |
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struct tee_device *teedev = ctx->teedev; |
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const u32 req_user_flags = TEE_SHM_DMA_BUF | TEE_SHM_USER_MAPPED; |
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const u32 req_kernel_flags = TEE_SHM_DMA_BUF | TEE_SHM_KERNEL_MAPPED; |
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struct tee_shm *shm; |
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void *ret; |
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int rc; |
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int num_pages; |
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unsigned long start; |
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if (flags != req_user_flags && flags != req_kernel_flags) |
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return ERR_PTR(-ENOTSUPP); |
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if (!tee_device_get(teedev)) |
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return ERR_PTR(-EINVAL); |
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if (!teedev->desc->ops->shm_register || |
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!teedev->desc->ops->shm_unregister) { |
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tee_device_put(teedev); |
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return ERR_PTR(-ENOTSUPP); |
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} |
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teedev_ctx_get(ctx); |
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shm = kzalloc(sizeof(*shm), GFP_KERNEL); |
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if (!shm) { |
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ret = ERR_PTR(-ENOMEM); |
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goto err; |
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} |
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shm->flags = flags | TEE_SHM_REGISTER; |
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shm->ctx = ctx; |
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shm->id = -1; |
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addr = untagged_addr(addr); |
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start = rounddown(addr, PAGE_SIZE); |
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shm->offset = addr - start; |
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shm->size = length; |
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num_pages = (roundup(addr + length, PAGE_SIZE) - start) / PAGE_SIZE; |
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shm->pages = kcalloc(num_pages, sizeof(*shm->pages), GFP_KERNEL); |
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if (!shm->pages) { |
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ret = ERR_PTR(-ENOMEM); |
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goto err; |
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} |
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if (flags & TEE_SHM_USER_MAPPED) { |
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rc = pin_user_pages_fast(start, num_pages, FOLL_WRITE, |
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shm->pages); |
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} else { |
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struct kvec *kiov; |
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int i; |
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kiov = kcalloc(num_pages, sizeof(*kiov), GFP_KERNEL); |
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if (!kiov) { |
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ret = ERR_PTR(-ENOMEM); |
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goto err; |
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} |
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for (i = 0; i < num_pages; i++) { |
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kiov[i].iov_base = (void *)(start + i * PAGE_SIZE); |
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kiov[i].iov_len = PAGE_SIZE; |
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} |
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rc = get_kernel_pages(kiov, num_pages, 0, shm->pages); |
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kfree(kiov); |
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} |
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if (rc > 0) |
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shm->num_pages = rc; |
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if (rc != num_pages) { |
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if (rc >= 0) |
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rc = -ENOMEM; |
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ret = ERR_PTR(rc); |
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goto err; |
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} |
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mutex_lock(&teedev->mutex); |
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shm->id = idr_alloc(&teedev->idr, shm, 1, 0, GFP_KERNEL); |
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mutex_unlock(&teedev->mutex); |
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if (shm->id < 0) { |
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ret = ERR_PTR(shm->id); |
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goto err; |
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} |
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rc = teedev->desc->ops->shm_register(ctx, shm, shm->pages, |
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shm->num_pages, start); |
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if (rc) { |
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ret = ERR_PTR(rc); |
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goto err; |
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} |
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if (flags & TEE_SHM_DMA_BUF) { |
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DEFINE_DMA_BUF_EXPORT_INFO(exp_info); |
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exp_info.ops = &tee_shm_dma_buf_ops; |
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exp_info.size = shm->size; |
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exp_info.flags = O_RDWR; |
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exp_info.priv = shm; |
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shm->dmabuf = dma_buf_export(&exp_info); |
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if (IS_ERR(shm->dmabuf)) { |
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ret = ERR_CAST(shm->dmabuf); |
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teedev->desc->ops->shm_unregister(ctx, shm); |
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goto err; |
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} |
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} |
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return shm; |
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err: |
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if (shm) { |
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if (shm->id >= 0) { |
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mutex_lock(&teedev->mutex); |
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idr_remove(&teedev->idr, shm->id); |
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mutex_unlock(&teedev->mutex); |
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} |
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release_registered_pages(shm); |
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} |
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kfree(shm); |
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teedev_ctx_put(ctx); |
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tee_device_put(teedev); |
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return ret; |
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} |
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EXPORT_SYMBOL_GPL(tee_shm_register); |
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/** |
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* tee_shm_get_fd() - Increase reference count and return file descriptor |
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* @shm: Shared memory handle |
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* @returns user space file descriptor to shared memory |
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*/ |
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int tee_shm_get_fd(struct tee_shm *shm) |
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{ |
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int fd; |
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if (!(shm->flags & TEE_SHM_DMA_BUF)) |
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return -EINVAL; |
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get_dma_buf(shm->dmabuf); |
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fd = dma_buf_fd(shm->dmabuf, O_CLOEXEC); |
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if (fd < 0) |
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dma_buf_put(shm->dmabuf); |
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return fd; |
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} |
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/** |
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* tee_shm_free() - Free shared memory |
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* @shm: Handle to shared memory to free |
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*/ |
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void tee_shm_free(struct tee_shm *shm) |
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{ |
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/* |
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* dma_buf_put() decreases the dmabuf reference counter and will |
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* call tee_shm_release() when the last reference is gone. |
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* |
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* In the case of driver private memory we call tee_shm_release |
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* directly instead as it doesn't have a reference counter. |
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*/ |
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if (shm->flags & TEE_SHM_DMA_BUF) |
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dma_buf_put(shm->dmabuf); |
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else |
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tee_shm_release(shm); |
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} |
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EXPORT_SYMBOL_GPL(tee_shm_free); |
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/** |
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* tee_shm_va2pa() - Get physical address of a virtual address |
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* @shm: Shared memory handle |
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* @va: Virtual address to tranlsate |
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* @pa: Returned physical address |
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* @returns 0 on success and < 0 on failure |
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*/ |
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int tee_shm_va2pa(struct tee_shm *shm, void *va, phys_addr_t *pa) |
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{ |
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if (!(shm->flags & TEE_SHM_MAPPED)) |
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return -EINVAL; |
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/* Check that we're in the range of the shm */ |
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if ((char *)va < (char *)shm->kaddr) |
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return -EINVAL; |
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if ((char *)va >= ((char *)shm->kaddr + shm->size)) |
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return -EINVAL; |
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return tee_shm_get_pa( |
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shm, (unsigned long)va - (unsigned long)shm->kaddr, pa); |
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} |
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EXPORT_SYMBOL_GPL(tee_shm_va2pa); |
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/** |
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* tee_shm_pa2va() - Get virtual address of a physical address |
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* @shm: Shared memory handle |
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* @pa: Physical address to tranlsate |
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* @va: Returned virtual address |
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* @returns 0 on success and < 0 on failure |
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*/ |
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int tee_shm_pa2va(struct tee_shm *shm, phys_addr_t pa, void **va) |
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{ |
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if (!(shm->flags & TEE_SHM_MAPPED)) |
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return -EINVAL; |
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/* Check that we're in the range of the shm */ |
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if (pa < shm->paddr) |
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return -EINVAL; |
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if (pa >= (shm->paddr + shm->size)) |
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return -EINVAL; |
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if (va) { |
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void *v = tee_shm_get_va(shm, pa - shm->paddr); |
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if (IS_ERR(v)) |
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return PTR_ERR(v); |
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*va = v; |
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} |
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return 0; |
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} |
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EXPORT_SYMBOL_GPL(tee_shm_pa2va); |
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/** |
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* tee_shm_get_va() - Get virtual address of a shared memory plus an offset |
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* @shm: Shared memory handle |
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* @offs: Offset from start of this shared memory |
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* @returns virtual address of the shared memory + offs if offs is within |
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* the bounds of this shared memory, else an ERR_PTR |
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*/ |
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void *tee_shm_get_va(struct tee_shm *shm, size_t offs) |
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{ |
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if (!(shm->flags & TEE_SHM_MAPPED)) |
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return ERR_PTR(-EINVAL); |
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if (offs >= shm->size) |
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return ERR_PTR(-EINVAL); |
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return (char *)shm->kaddr + offs; |
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} |
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EXPORT_SYMBOL_GPL(tee_shm_get_va); |
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/** |
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* tee_shm_get_pa() - Get physical address of a shared memory plus an offset |
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* @shm: Shared memory handle |
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* @offs: Offset from start of this shared memory |
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* @pa: Physical address to return |
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* @returns 0 if offs is within the bounds of this shared memory, else an |
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* error code. |
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*/ |
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int tee_shm_get_pa(struct tee_shm *shm, size_t offs, phys_addr_t *pa) |
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{ |
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if (offs >= shm->size) |
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return -EINVAL; |
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if (pa) |
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*pa = shm->paddr + offs; |
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return 0; |
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} |
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EXPORT_SYMBOL_GPL(tee_shm_get_pa); |
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/** |
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* tee_shm_get_from_id() - Find shared memory object and increase reference |
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* count |
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* @ctx: Context owning the shared memory |
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* @id: Id of shared memory object |
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* @returns a pointer to 'struct tee_shm' on success or an ERR_PTR on failure |
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*/ |
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struct tee_shm *tee_shm_get_from_id(struct tee_context *ctx, int id) |
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{ |
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struct tee_device *teedev; |
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struct tee_shm *shm; |
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if (!ctx) |
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return ERR_PTR(-EINVAL); |
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teedev = ctx->teedev; |
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mutex_lock(&teedev->mutex); |
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shm = idr_find(&teedev->idr, id); |
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if (!shm || shm->ctx != ctx) |
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shm = ERR_PTR(-EINVAL); |
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else if (shm->flags & TEE_SHM_DMA_BUF) |
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get_dma_buf(shm->dmabuf); |
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mutex_unlock(&teedev->mutex); |
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return shm; |
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} |
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EXPORT_SYMBOL_GPL(tee_shm_get_from_id); |
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/** |
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* tee_shm_put() - Decrease reference count on a shared memory handle |
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* @shm: Shared memory handle |
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*/ |
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void tee_shm_put(struct tee_shm *shm) |
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{ |
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if (shm->flags & TEE_SHM_DMA_BUF) |
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dma_buf_put(shm->dmabuf); |
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} |
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EXPORT_SYMBOL_GPL(tee_shm_put);
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