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560 lines
14 KiB
560 lines
14 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* Copyright (c) 2015-2017, 2019-2021 Linaro Limited |
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*/ |
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#include <linux/anon_inodes.h> |
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#include <linux/device.h> |
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#include <linux/idr.h> |
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#include <linux/mm.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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|
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static void shm_put_kernel_pages(struct page **pages, size_t page_count) |
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{ |
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size_t n; |
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for (n = 0; n < page_count; n++) |
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put_page(pages[n]); |
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} |
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static int shm_get_kernel_pages(unsigned long start, size_t page_count, |
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struct page **pages) |
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{ |
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struct kvec *kiov; |
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size_t n; |
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int rc; |
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kiov = kcalloc(page_count, sizeof(*kiov), GFP_KERNEL); |
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if (!kiov) |
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return -ENOMEM; |
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for (n = 0; n < page_count; n++) { |
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kiov[n].iov_base = (void *)(start + n * PAGE_SIZE); |
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kiov[n].iov_len = PAGE_SIZE; |
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} |
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rc = get_kernel_pages(kiov, page_count, 0, pages); |
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kfree(kiov); |
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return rc; |
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} |
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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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shm_put_kernel_pages(shm->pages, shm->num_pages); |
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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_device *teedev, struct tee_shm *shm) |
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{ |
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if (shm->flags & TEE_SHM_POOL) { |
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teedev->pool->ops->free(teedev->pool, shm); |
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} else if (shm->flags & TEE_SHM_DYNAMIC) { |
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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 tee_shm *shm_alloc_helper(struct tee_context *ctx, size_t size, |
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size_t align, u32 flags, int id) |
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{ |
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struct tee_device *teedev = ctx->teedev; |
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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 (!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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refcount_set(&shm->refcount, 1); |
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shm->flags = flags; |
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shm->id = id; |
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/* |
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* We're assigning this as it is needed if the shm is to be |
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* registered. If this function returns OK then the caller expected |
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* to call teedev_ctx_get() or clear shm->ctx in case it's not |
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* needed any longer. |
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*/ |
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shm->ctx = ctx; |
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rc = teedev->pool->ops->alloc(teedev->pool, shm, size, align); |
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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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teedev_ctx_get(ctx); |
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return 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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/** |
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* tee_shm_alloc_user_buf() - Allocate shared memory for user space |
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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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* Memory allocated as user space shared memory is automatically freed when |
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* the TEE file pointer is closed. The primary usage of this function is |
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* when the TEE driver doesn't support registering ordinary user space |
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* memory. |
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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_user_buf(struct tee_context *ctx, size_t size) |
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{ |
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u32 flags = TEE_SHM_DYNAMIC | TEE_SHM_POOL; |
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struct tee_device *teedev = ctx->teedev; |
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struct tee_shm *shm; |
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void *ret; |
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int id; |
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mutex_lock(&teedev->mutex); |
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id = idr_alloc(&teedev->idr, NULL, 1, 0, GFP_KERNEL); |
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mutex_unlock(&teedev->mutex); |
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if (id < 0) |
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return ERR_PTR(id); |
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shm = shm_alloc_helper(ctx, size, PAGE_SIZE, flags, id); |
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if (IS_ERR(shm)) { |
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mutex_lock(&teedev->mutex); |
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idr_remove(&teedev->idr, id); |
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mutex_unlock(&teedev->mutex); |
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return shm; |
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} |
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mutex_lock(&teedev->mutex); |
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ret = idr_replace(&teedev->idr, shm, id); |
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mutex_unlock(&teedev->mutex); |
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if (IS_ERR(ret)) { |
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tee_shm_free(shm); |
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return ret; |
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} |
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return shm; |
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} |
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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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u32 flags = TEE_SHM_DYNAMIC | TEE_SHM_POOL; |
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return shm_alloc_helper(ctx, size, PAGE_SIZE, flags, -1); |
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} |
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EXPORT_SYMBOL_GPL(tee_shm_alloc_kernel_buf); |
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/** |
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* tee_shm_alloc_priv_buf() - Allocate shared memory for a privately shared |
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* 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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* This function returns similar shared memory as |
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* tee_shm_alloc_kernel_buf(), but with the difference that the memory |
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* might not be registered in secure world in case the driver supports |
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* passing memory not registered in advance. |
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* |
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* This function should normally only be used internally in the TEE |
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* drivers. |
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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_priv_buf(struct tee_context *ctx, size_t size) |
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{ |
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u32 flags = TEE_SHM_PRIV | TEE_SHM_POOL; |
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return shm_alloc_helper(ctx, size, sizeof(long) * 2, flags, -1); |
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} |
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EXPORT_SYMBOL_GPL(tee_shm_alloc_priv_buf); |
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static struct tee_shm * |
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register_shm_helper(struct tee_context *ctx, unsigned long addr, |
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size_t length, u32 flags, int id) |
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{ |
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struct tee_device *teedev = ctx->teedev; |
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struct tee_shm *shm; |
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unsigned long start; |
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size_t num_pages; |
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void *ret; |
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int rc; |
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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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ret = ERR_PTR(-ENOTSUPP); |
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goto err_dev_put; |
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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_ctx_put; |
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} |
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refcount_set(&shm->refcount, 1); |
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shm->flags = flags; |
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shm->ctx = ctx; |
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shm->id = id; |
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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_free_shm; |
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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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rc = shm_get_kernel_pages(start, num_pages, shm->pages); |
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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_put_shm_pages; |
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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_put_shm_pages; |
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} |
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return shm; |
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err_put_shm_pages: |
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if (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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shm_put_kernel_pages(shm->pages, shm->num_pages); |
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kfree(shm->pages); |
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err_free_shm: |
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kfree(shm); |
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err_ctx_put: |
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teedev_ctx_put(ctx); |
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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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/** |
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* tee_shm_register_user_buf() - Register a userspace shared memory buffer |
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* @ctx: Context that registers the shared memory |
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* @addr: The userspace address of the shared buffer |
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* @length: Length of the shared buffer |
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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_register_user_buf(struct tee_context *ctx, |
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unsigned long addr, size_t length) |
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{ |
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u32 flags = TEE_SHM_USER_MAPPED | TEE_SHM_DYNAMIC; |
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struct tee_device *teedev = ctx->teedev; |
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struct tee_shm *shm; |
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void *ret; |
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int id; |
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mutex_lock(&teedev->mutex); |
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id = idr_alloc(&teedev->idr, NULL, 1, 0, GFP_KERNEL); |
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mutex_unlock(&teedev->mutex); |
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if (id < 0) |
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return ERR_PTR(id); |
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shm = register_shm_helper(ctx, addr, length, flags, id); |
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if (IS_ERR(shm)) { |
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mutex_lock(&teedev->mutex); |
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idr_remove(&teedev->idr, id); |
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mutex_unlock(&teedev->mutex); |
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return shm; |
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} |
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mutex_lock(&teedev->mutex); |
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ret = idr_replace(&teedev->idr, shm, id); |
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mutex_unlock(&teedev->mutex); |
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if (IS_ERR(ret)) { |
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tee_shm_free(shm); |
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return ret; |
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} |
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return shm; |
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} |
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/** |
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* tee_shm_register_kernel_buf() - Register kernel memory to be shared with |
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* secure world |
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* @ctx: Context that registers the shared memory |
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* @addr: The buffer |
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* @length: Length of the buffer |
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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_register_kernel_buf(struct tee_context *ctx, |
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void *addr, size_t length) |
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{ |
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u32 flags = TEE_SHM_DYNAMIC; |
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return register_shm_helper(ctx, (unsigned long)addr, length, flags, -1); |
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} |
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EXPORT_SYMBOL_GPL(tee_shm_register_kernel_buf); |
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static int tee_shm_fop_release(struct inode *inode, struct file *filp) |
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{ |
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tee_shm_put(filp->private_data); |
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return 0; |
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} |
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static int tee_shm_fop_mmap(struct file *filp, struct vm_area_struct *vma) |
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{ |
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struct tee_shm *shm = filp->private_data; |
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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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/* check for overflowing the buffer's size */ |
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if (vma->vm_pgoff + vma_pages(vma) > shm->size >> PAGE_SHIFT) |
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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 file_operations tee_shm_fops = { |
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.owner = THIS_MODULE, |
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.release = tee_shm_fop_release, |
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.mmap = tee_shm_fop_mmap, |
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}; |
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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->id < 0) |
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return -EINVAL; |
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/* matched by tee_shm_put() in tee_shm_op_release() */ |
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refcount_inc(&shm->refcount); |
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fd = anon_inode_getfd("tee_shm", &tee_shm_fops, shm, O_RDWR); |
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if (fd < 0) |
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tee_shm_put(shm); |
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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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tee_shm_put(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->kaddr) |
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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->kaddr) |
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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->kaddr) |
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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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/** |
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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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/** |
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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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|
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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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/* |
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* If the tee_shm was found in the IDR it must have a refcount |
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* larger than 0 due to the guarantee in tee_shm_put() below. So |
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* it's safe to use refcount_inc(). |
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*/ |
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if (!shm || shm->ctx != ctx) |
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shm = ERR_PTR(-EINVAL); |
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else |
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refcount_inc(&shm->refcount); |
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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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/** |
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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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struct tee_device *teedev = shm->ctx->teedev; |
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bool do_release = false; |
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mutex_lock(&teedev->mutex); |
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if (refcount_dec_and_test(&shm->refcount)) { |
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/* |
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* refcount has reached 0, we must now remove it from the |
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* IDR before releasing the mutex. This will guarantee that |
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* the refcount_inc() in tee_shm_get_from_id() never starts |
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* from 0. |
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*/ |
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if (shm->id >= 0) |
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idr_remove(&teedev->idr, shm->id); |
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do_release = true; |
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} |
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mutex_unlock(&teedev->mutex); |
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|
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if (do_release) |
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tee_shm_release(teedev, shm); |
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} |
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EXPORT_SYMBOL_GPL(tee_shm_put);
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