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|
/*
* Copyright (c) 2015-2016, Linaro Limited
*
* This software is licensed under the terms of the GNU General Public
* License version 2, as published by the Free Software Foundation, and
* may be copied, distributed, and modified under those terms.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
*/
#include <linux/device.h>
#include <linux/dma-buf.h>
#include <linux/fdtable.h>
#include <linux/idr.h>
#include <linux/sched.h>
#include <linux/slab.h>
#include <linux/tee_drv.h>
#include "tee_private.h"
static void tee_shm_release(struct tee_shm *shm)
{
struct tee_device *teedev = shm->teedev;
mutex_lock(&teedev->mutex);
idr_remove(&teedev->idr, shm->id);
if (shm->ctx)
list_del(&shm->link);
mutex_unlock(&teedev->mutex);
if (shm->flags & TEE_SHM_POOL) {
struct tee_shm_pool_mgr *poolm;
if (shm->flags & TEE_SHM_DMA_BUF)
poolm = teedev->pool->dma_buf_mgr;
else
poolm = teedev->pool->private_mgr;
poolm->ops->free(poolm, shm);
} else if (shm->flags & TEE_SHM_REGISTER) {
size_t n;
int rc = teedev->desc->ops->shm_unregister(shm->ctx, shm);
if (rc)
dev_err(teedev->dev.parent,
"unregister shm %p failed: %d", shm, rc);
for (n = 0; n < shm->num_pages; n++)
put_page(shm->pages[n]);
kfree(shm->pages);
}
if (shm->ctx)
teedev_ctx_put(shm->ctx);
kfree(shm);
tee_device_put(teedev);
}
static struct sg_table *tee_shm_op_map_dma_buf(struct dma_buf_attachment
*attach, enum dma_data_direction dir)
{
return NULL;
}
static void tee_shm_op_unmap_dma_buf(struct dma_buf_attachment *attach,
struct sg_table *table,
enum dma_data_direction dir)
{
}
static void tee_shm_op_release(struct dma_buf *dmabuf)
{
struct tee_shm *shm = dmabuf->priv;
tee_shm_release(shm);
}
static void *tee_shm_op_map_atomic(struct dma_buf *dmabuf, unsigned long pgnum)
{
return NULL;
}
static void *tee_shm_op_map(struct dma_buf *dmabuf, unsigned long pgnum)
{
return NULL;
}
static int tee_shm_op_mmap(struct dma_buf *dmabuf, struct vm_area_struct *vma)
{
struct tee_shm *shm = dmabuf->priv;
size_t size = vma->vm_end - vma->vm_start;
/* Refuse sharing shared memory provided by application */
if (shm->flags & TEE_SHM_REGISTER)
return -EINVAL;
return remap_pfn_range(vma, vma->vm_start, shm->paddr >> PAGE_SHIFT,
size, vma->vm_page_prot);
}
static const struct dma_buf_ops tee_shm_dma_buf_ops = {
.map_dma_buf = tee_shm_op_map_dma_buf,
.unmap_dma_buf = tee_shm_op_unmap_dma_buf,
.release = tee_shm_op_release,
.map_atomic = tee_shm_op_map_atomic,
.map = tee_shm_op_map,
.mmap = tee_shm_op_mmap,
};
static struct tee_shm *__tee_shm_alloc(struct tee_context *ctx,
struct tee_device *teedev,
size_t size, u32 flags)
{
struct tee_shm_pool_mgr *poolm = NULL;
struct tee_shm *shm;
void *ret;
int rc;
if (ctx && ctx->teedev != teedev) {
dev_err(teedev->dev.parent, "ctx and teedev mismatch\n");
return ERR_PTR(-EINVAL);
}
if (!(flags & TEE_SHM_MAPPED)) {
dev_err(teedev->dev.parent,
"only mapped allocations supported\n");
return ERR_PTR(-EINVAL);
}
if ((flags & ~(TEE_SHM_MAPPED | TEE_SHM_DMA_BUF))) {
dev_err(teedev->dev.parent, "invalid shm flags 0x%x", flags);
return ERR_PTR(-EINVAL);
}
if (!tee_device_get(teedev))
return ERR_PTR(-EINVAL);
if (!teedev->pool) {
/* teedev has been detached from driver */
ret = ERR_PTR(-EINVAL);
goto err_dev_put;
}
shm = kzalloc(sizeof(*shm), GFP_KERNEL);
if (!shm) {
ret = ERR_PTR(-ENOMEM);
goto err_dev_put;
}
shm->flags = flags | TEE_SHM_POOL;
shm->teedev = teedev;
shm->ctx = ctx;
if (flags & TEE_SHM_DMA_BUF)
poolm = teedev->pool->dma_buf_mgr;
else
poolm = teedev->pool->private_mgr;
rc = poolm->ops->alloc(poolm, shm, size);
if (rc) {
ret = ERR_PTR(rc);
goto err_kfree;
}
mutex_lock(&teedev->mutex);
shm->id = idr_alloc(&teedev->idr, shm, 1, 0, GFP_KERNEL);
mutex_unlock(&teedev->mutex);
if (shm->id < 0) {
ret = ERR_PTR(shm->id);
goto err_pool_free;
}
if (flags & TEE_SHM_DMA_BUF) {
DEFINE_DMA_BUF_EXPORT_INFO(exp_info);
exp_info.ops = &tee_shm_dma_buf_ops;
exp_info.size = shm->size;
exp_info.flags = O_RDWR;
exp_info.priv = shm;
shm->dmabuf = dma_buf_export(&exp_info);
if (IS_ERR(shm->dmabuf)) {
ret = ERR_CAST(shm->dmabuf);
goto err_rem;
}
}
if (ctx) {
teedev_ctx_get(ctx);
mutex_lock(&teedev->mutex);
list_add_tail(&shm->link, &ctx->list_shm);
mutex_unlock(&teedev->mutex);
}
return shm;
err_rem:
mutex_lock(&teedev->mutex);
idr_remove(&teedev->idr, shm->id);
mutex_unlock(&teedev->mutex);
err_pool_free:
poolm->ops->free(poolm, shm);
err_kfree:
kfree(shm);
err_dev_put:
tee_device_put(teedev);
return ret;
}
/**
* tee_shm_alloc() - Allocate shared memory
* @ctx: Context that allocates the shared memory
* @size: Requested size of shared memory
* @flags: Flags setting properties for the requested shared memory.
*
* Memory allocated as global shared memory is automatically freed when the
* TEE file pointer is closed. The @flags field uses the bits defined by
* TEE_SHM_* in <linux/tee_drv.h>. TEE_SHM_MAPPED must currently always be
* set. If TEE_SHM_DMA_BUF global shared memory will be allocated and
* associated with a dma-buf handle, else driver private memory.
*/
struct tee_shm *tee_shm_alloc(struct tee_context *ctx, size_t size, u32 flags)
{
return __tee_shm_alloc(ctx, ctx->teedev, size, flags);
}
EXPORT_SYMBOL_GPL(tee_shm_alloc);
struct tee_shm *tee_shm_priv_alloc(struct tee_device *teedev, size_t size)
{
return __tee_shm_alloc(NULL, teedev, size, TEE_SHM_MAPPED);
}
EXPORT_SYMBOL_GPL(tee_shm_priv_alloc);
struct tee_shm *tee_shm_register(struct tee_context *ctx, unsigned long addr,
size_t length, u32 flags)
{
struct tee_device *t
|