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![Arvind Yadav](/assets/img/avatar_default.png)
dma_buf_ops are not supposed to change at runtime. All functions working with dma_buf_ops provided by <linux/dma-buf.h> work with const dma_buf_ops. So mark the non-const structs as const. File size before: text data bss dec hex filename 2026 112 0 2138 85a drivers/tee/tee_shm.o File size After adding 'const': text data bss dec hex filename 2138 0 0 2138 85a drivers/tee/tee_shm.o Signed-off-by: Arvind Yadav <arvind.yadav.cs@gmail.com> Signed-off-by: Jens Wiklander <jens.wiklander@linaro.org>
358 lines
8.8 KiB
C
358 lines
8.8 KiB
C
/*
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* Copyright (c) 2015-2016, Linaro Limited
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*
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* This software is licensed under the terms of the GNU General Public
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* License version 2, as published by the Free Software Foundation, and
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* may be copied, distributed, and modified under those terms.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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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 "tee_private.h"
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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->teedev;
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struct tee_shm_pool_mgr *poolm;
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mutex_lock(&teedev->mutex);
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idr_remove(&teedev->idr, shm->id);
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if (shm->ctx)
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list_del(&shm->link);
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mutex_unlock(&teedev->mutex);
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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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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 void *tee_shm_op_map_atomic(struct dma_buf *dmabuf, unsigned long pgnum)
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{
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return NULL;
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}
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static void *tee_shm_op_map(struct dma_buf *dmabuf, unsigned long pgnum)
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{
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return NULL;
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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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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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.map_atomic = tee_shm_op_map_atomic,
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.map = tee_shm_op_map,
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.mmap = tee_shm_op_mmap,
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};
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/**
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* tee_shm_alloc() - Allocate shared memory
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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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* @flags: Flags setting properties for the requested shared memory.
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*
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* Memory allocated as global shared memory is automatically freed when the
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* TEE file pointer is closed. The @flags field uses the bits defined by
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* TEE_SHM_* in <linux/tee_drv.h>. TEE_SHM_MAPPED must currently always be
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* set. If TEE_SHM_DMA_BUF global shared memory will be allocated and
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* associated with a dma-buf handle, else driver private memory.
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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))) {
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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;
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shm->teedev = teedev;
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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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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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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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goto err_rem;
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}
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}
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mutex_lock(&teedev->mutex);
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list_add_tail(&shm->link, &ctx->list_shm);
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mutex_unlock(&teedev->mutex);
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return shm;
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err_rem:
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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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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_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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u32 req_flags = TEE_SHM_MAPPED | TEE_SHM_DMA_BUF;
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int fd;
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if ((shm->flags & req_flags) != req_flags)
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return -EINVAL;
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fd = dma_buf_fd(shm->dmabuf, O_CLOEXEC);
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if (fd >= 0)
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get_dma_buf(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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/* 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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/* 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 (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_get_id() - Get id of a shared memory object
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* @shm: Shared memory handle
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* @returns id
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*/
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int tee_shm_get_id(struct tee_shm *shm)
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{
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return shm->id;
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}
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EXPORT_SYMBOL_GPL(tee_shm_get_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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