tee: add tee_shm_alloc_user_buf()

Adds a new function tee_shm_alloc_user_buf() for user mode allocations,
replacing passing the flags TEE_SHM_MAPPED | TEE_SHM_DMA_BUF to
tee_shm_alloc().

Reviewed-by: Sumit Garg <sumit.garg@linaro.org>
Signed-off-by: Jens Wiklander <jens.wiklander@linaro.org>

1 files changed, 17 insertions, 0 deletions

diff --git a/drivers/tee/tee_shm.c b/drivers/tee/tee_shm.c
index 499fccba3d74..7e7e762fc1de 100644
--- a/drivers/tee/tee_shm.c
+++ b/drivers/tee/tee_shm.c
@@ -128,6 +128,23 @@ err_dev_put:
 EXPORT_SYMBOL_GPL(tee_shm_alloc);
 
 /**
+ * tee_shm_alloc_user_buf() - Allocate shared memory for user space
+ * @ctx:	Context that allocates the shared memory
+ * @size:	Requested size of shared memory
+ *
+ * Memory allocated as user space shared memory is automatically freed when
+ * the TEE file pointer is closed. The primary usage of this function is
+ * when the TEE driver doesn't support registering ordinary user space
+ * memory.
+ *
+ * @returns a pointer to 'struct tee_shm'
+ */
+struct tee_shm *tee_shm_alloc_user_buf(struct tee_context *ctx, size_t size)
+{
+	return tee_shm_alloc(ctx, size, TEE_SHM_MAPPED | TEE_SHM_DMA_BUF);
+}
+
+/**
  * tee_shm_alloc_kernel_buf() - Allocate shared memory for kernel buffer
  * @ctx:	Context that allocates the shared memory
  * @size:	Requested size of shared memory