Commit dc7019b7 authored by Jens Wiklander's avatar Jens Wiklander
Browse files

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: default avatarTyler Hicks <tyhicks@linux.microsoft.com>
Reviewed-by: default avatarSumit Garg <sumit.garg@linaro.org>
Signed-off-by: default avatarJens Wiklander <jens.wiklander@linaro.org>
parent b5c10dd0

drivers/tee/tee_shm.c

+18 −0
Original line number Diff line number Diff line
@@ -193,6 +193,24 @@ struct tee_shm *tee_shm_alloc(struct tee_context *ctx, size_t size, u32 flags) 
}

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)

{

include/linux/tee_drv.h

+1 −0
Original line number Diff line number Diff line
@@ -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