tee: add tee_shm_alloc_kernel_buf()

Adds a new function tee_shm_alloc_kernel_buf() to allocate shared memory
from a kernel driver. This function can later be made more lightweight
by unnecessary dma-buf export.

Cc: stable@vger.kernel.org
Reviewed-by: Tyler Hicks <tyhicks@linux.microsoft.com>
Reviewed-by: Sumit Garg <sumit.garg@linaro.org>
Signed-off-by: Jens Wiklander <jens.wiklander@linaro.org>
This commit is contained in:
Jens Wiklander 2021-06-14 17:33:14 -05:00
parent b5c10dd04b
commit dc7019b7d0
2 changed files with 19 additions and 0 deletions

View File

@ -193,6 +193,24 @@ err_dev_put:
}
EXPORT_SYMBOL_GPL(tee_shm_alloc);
/**
* tee_shm_alloc_kernel_buf() - Allocate shared memory for kernel buffer
* @ctx: Context that allocates the shared memory
* @size: Requested size of shared memory
*
* The returned memory registered in secure world and is suitable to be
* passed as a memory buffer in parameter argument to
* tee_client_invoke_func(). The memory allocated is later freed with a
* call to tee_shm_free().
*
* @returns a pointer to 'struct tee_shm'
*/
struct tee_shm *tee_shm_alloc_kernel_buf(struct tee_context *ctx, size_t size)
{
return tee_shm_alloc(ctx, size, TEE_SHM_MAPPED | TEE_SHM_DMA_BUF);
}
EXPORT_SYMBOL_GPL(tee_shm_alloc_kernel_buf);
struct tee_shm *tee_shm_register(struct tee_context *ctx, unsigned long addr,
size_t length, u32 flags)
{

View File

@ -332,6 +332,7 @@ void *tee_get_drvdata(struct tee_device *teedev);
* @returns a pointer to 'struct tee_shm'
*/
struct tee_shm *tee_shm_alloc(struct tee_context *ctx, size_t size, u32 flags);
struct tee_shm *tee_shm_alloc_kernel_buf(struct tee_context *ctx, size_t size);
/**
* tee_shm_register() - Register shared memory buffer