From: Jens Wiklander jens.wiklander@linaro.org
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 Signed-off-by: Jens Wiklander jens.wiklander@linaro.org Reviewed-by: Tyler Hicks tyhicks@linux.microsoft.com --- drivers/tee/tee_shm.c | 18 ++++++++++++++++++ include/linux/tee_drv.h | 1 + 2 files changed, 19 insertions(+)
diff --git a/drivers/tee/tee_shm.c b/drivers/tee/tee_shm.c index 00472f5ce22e..c65e44707cd6 100644 --- a/drivers/tee/tee_shm.c +++ b/drivers/tee/tee_shm.c @@ -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) { diff --git a/include/linux/tee_drv.h b/include/linux/tee_drv.h index 54269e47ac9a..8990f7628387 100644 --- a/include/linux/tee_drv.h +++ b/include/linux/tee_drv.h @@ -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