On 2021-06-09 12:23:20, Jens Wiklander wrote:
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.
Signed-off-by: Jens Wiklander jens.wiklander@linaro.org
Reviewed-by: Tyler Hicks tyhicks@linux.microsoft.com
Tyler
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 b9dbf4bce149..63fce8d39d8b 100644 --- a/drivers/tee/tee_shm.c +++ b/drivers/tee/tee_shm.c @@ -192,6 +192,24 @@ 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 62b7c7a55743..58b319766f8e 100644 --- a/include/linux/tee_drv.h +++ b/include/linux/tee_drv.h @@ -282,6 +282,7 @@ 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
-- 2.31.1