On Fri, Aug 19, 2022 at 01:54:31PM +0530, Sumit Garg wrote:
Hi Olivier,
On Fri, 12 Aug 2022 at 20:01, Olivier Masse olivier.masse@nxp.com wrote:
Add a new ioctl called TEE_IOC_SHM_REGISTER_FD to register a shared memory from a dmabuf file descriptor. This new ioctl will allow the Linux Kernel to register a buffer to be used by the Secure Data Path OPTEE OS feature.
Please find more information here: https://static.linaro.org/connect/san19/presentations/san19-107.pdf
Patch tested on Hikey 6220.
AFAIU, for the OP-TEE SDP feature to work you need to have a DMA-BUF heap driver for allocating secure buffers through exposed chardev: "/dev/dma_heap/sdp". Have you tested it with some out-of-tree driver as I can't find it upstream? Also, do you plan to push that upstream as well?
BTW, please add a changelog while sending newer patch-set versions.
Also after the huge discussion last year dma-buf are agreed to be under the "you need an open source userspace for any new uapi using them" rule that all gpu drivers are under.
Does this exist here? -Daniel
-Sumit
Etienne Carriere (1): tee: new ioctl to a register tee_shm from a dmabuf file descriptor
drivers/tee/tee_core.c | 38 +++++++++++++++ drivers/tee/tee_shm.c | 99 +++++++++++++++++++++++++++++++++++++++- include/linux/tee_drv.h | 11 +++++ include/uapi/linux/tee.h | 29 ++++++++++++ 4 files changed, 175 insertions(+), 2 deletions(-)
-- 2.25.0