From: Jens Wiklander jens.wiklander@linaro.org
commit dc7019b7d0e188d4093b34bd0747ed0d668c63bf upstream.
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 Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/tee/tee_shm.c | 18 ++++++++++++++++++ include/linux/tee_drv.h | 1 + 2 files changed, 19 insertions(+)
--- a/drivers/tee/tee_shm.c +++ b/drivers/tee/tee_shm.c @@ -219,6 +219,24 @@ struct tee_shm *tee_shm_priv_alloc(struc } EXPORT_SYMBOL_GPL(tee_shm_priv_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) { --- a/include/linux/tee_drv.h +++ b/include/linux/tee_drv.h @@ -317,6 +317,7 @@ void *tee_get_drvdata(struct tee_device * @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_priv_alloc() - Allocate shared memory privately