linux-kernel - Re: [PATCH v2 0/1] tee: Add tee_shm_register

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Date:   Fri, 19 Aug 2022 13:54:31 +0530
From:   Sumit Garg <sumit.garg@...aro.org>
To:     Olivier Masse <olivier.masse@....com>
Cc:     etienne.carriere@...aro.org, jens.wiklander@...aro.org,
        sumit.semwal@...aro.org, christian.koenig@....com,
        op-tee@...ts.trustedfirmware.org, linaro-mm-sig@...ts.linaro.org,
        linux-kernel@...r.kernel.org, linux-media@...r.kernel.org,
        dri-devel@...ts.freedesktop.org, clement.faure@....com
Subject: Re: [PATCH v2 0/1] tee: Add tee_shm_register_fd

Hi Olivier,

On Fri, 12 Aug 2022 at 20:01, Olivier Masse <olivier.masse@....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.

-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
>