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driver: tee: Handle NULL pointer indication from client

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TEE Client introduce a new capability "TEE_GEN_CAP_MEMREF_NULL"
to handle the support of the shared memory buffer with a NULL pointer.

This capability depends on TEE Capabilities and driver support.
Driver and TEE exchange capabilities at driver initialization.

Signed-off-by: Michael Whitfield <michael.whitfield@nxp.com>
Signed-off-by: Cedric Neveux <cedric.neveux@nxp.com>
Reviewed-by: Joakim Bech <joakim.bech@linaro.org>
Tested-by: Joakim Bech <joakim.bech@linaro.org> (QEMU)
Signed-off-by: Jens Wiklander <jens.wiklander@linaro.org>
This commit is contained in:
Cedric Neveux
2019-03-04 08:54:23 +01:00
committed by Jens Wiklander
parent 9123e3a74e
commit ba171d3f08
5 changed files with 56 additions and 17 deletions
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3
include/linux/tee_drv.h
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@@ -47,6 +47,8 @@ struct tee_shm_pool;
* and just return with an error code. It is needed for requests
* that arises from TEE based kernel drivers that should be
* non-blocking in nature.
* @cap_memref_null: flag indicating if the TEE Client support shared
* memory buffer with a NULL pointer.
*/
struct tee_context {
struct tee_device *teedev;
@@ -54,6 +56,7 @@ struct tee_context {
struct kref refcount;
bool releasing;
bool supp_nowait;
bool cap_memref_null;
};
struct tee_param_memref {