[PATCH v2 00/11] Add mediate-drm secure flow for SVP

Sun Nov 5 17:37:02 PST 2023

On Sun, 2023-11-05 at 13:44 +0000, Jason-JH Lin (林睿祥) wrote:
> Hi CK,
> 
> Thanks for the reviews.
> 
> On Tue, 2023-10-31 at 02:12 +0000, CK Hu (胡俊光) wrote:
> > Hi, Jason:
> > 
> > On Mon, 2023-10-23 at 12:45 +0800, Jason-JH.Lin wrote:
> > > The patch series provides drm driver support for enabling secure
> > > video
> > > path (SVP) playback on MediaiTek hardware in the Linux kernel.
> > > 
> > > Memory Definitions:
> > > secure memory - Memory allocated in the TEE (Trusted Execution
> > > Environment) which is inaccessible in the REE (Rich Execution
> > > Environment, i.e. linux kernel/userspace).
> > > secure handle - Integer value which acts as reference to 'secure
> > > memory'. Used in communication between TEE and REE to reference
> > > 'secure memory'.
> > > secure buffer - 'secure memory' that is used to store decrypted,
> > > compressed video or for other general purposes in the TEE.
> > > secure surface - 'secure memory' that is used to store graphic
> > > buffers.
> > > 
> > > Memory Usage in SVP:
> > > The overall flow of SVP starts with encrypted video coming in
> > > from
> > > an
> > > outside source into the REE. The REE will then allocate a 'secure
> > > buffer' and send the corresponding 'secure handle' along with the
> > > encrypted, compressed video data to the TEE. The TEE will then
> > > decrypt
> > > the video and store the result in the 'secure buffer'. The REE
> > > will
> > > then allocate a 'secure surface'. The REE will pass the 'secure
> > > handles' for both the 'secure buffer' and 'secure surface' into
> > > the
> > > TEE for video decoding. The video decoder HW will then decode the
> > > contents of the 'secure buffer' and place the result in the
> > > 'secure
> > > surface'. The REE will then attach the 'secure surface' to the
> > > overlay
> > > plane for rendering of the video.
> > > 
> > > Everything relating to ensuring security of the actual contents
> > > of
> > > the
> > > 'secure buffer' and 'secure surface' is out of scope for the REE
> > > and
> > > is the responsibility of the TEE.
> > > 
> > > DRM driver handles allocation of gem objects that are backed by a
> > > 'secure
> > > surface' and for displaying a 'secure surface' on the overlay
> > > plane.
> > > This introduces a new flag for object creation called
> > > DRM_MTK_GEM_CREATE_ENCRYPTED which indicates it should be a
> > > 'secure
> > > surface'. All changes here are in MediaTek specific code.
> > > 
> > > ---
> > > Based on 3 series and 1 patch:
> > > [1] dma-buf: heaps: Add MediaTek secure heap
> > > - 
> > > 
> 
> 
https://urldefense.com/v3/__https://patchwork.kernel.org/project/linux-mediatek/list/?series=782776__;!!CTRNKA9wMg0ARbw!mFKxGfpXLEF8-AzhljGG_N12bk-h7W0-JZeTZZkqxJgB5WFbMTxeEjalrslLrAJ3iwYF6-k273jgzXKSQXcbgPU$
> > >  
> > > 
> > > [2] add driver to support secure video decoder
> > > - 
> > > 
> 
> 
https://urldefense.com/v3/__https://patchwork.kernel.org/project/linux-mediatek/list/?series=782922__;!!CTRNKA9wMg0ARbw!mFKxGfpXLEF8-AzhljGG_N12bk-h7W0-JZeTZZkqxJgB5WFbMTxeEjalrslLrAJ3iwYF6-k273jgzXKSIPyCQxI$
> > >  
> > > 
> > > [3] soc: mediatek: Add register definitions for GCE
> > > - 
> > > 
> 
> 
https://urldefense.com/v3/__https://patchwork.kernel.org/project/linux-mediatek/patch/20231017064717.21616-2-shawn.sung@mediatek.com/__;!!CTRNKA9wMg0ARbw!mFKxGfpXLEF8-AzhljGG_N12bk-h7W0-JZeTZZkqxJgB5WFbMTxeEjalrslLrAJ3iwYF6-k273jgzXKSrO8gmbI$
> > >  
> > > 
> > > [4] Add CMDQ secure driver for SVP
> > > - 
> > > 
> 
> 
https://urldefense.com/v3/__https://patchwork.kernel.org/project/linux-mediatek/list/?series=795502__;!!CTRNKA9wMg0ARbw!mFKxGfpXLEF8-AzhljGG_N12bk-h7W0-JZeTZZkqxJgB5WFbMTxeEjalrslLrAJ3iwYF6-k273jgzXKSposD2Rk$
> > >  
> > 
> > Secure display depend on secure mmsys. Routing control should be
> > secure
> > so mmsys driver should have some modification that call into secure
> > world to change routing. Add mmsys series in this dependency list.
> 
> Yes, I'll move the route settings to the secure world for those SVP
> supported SoC. The mmsys modifications are still in progress. It will
> be send after a few version.

Add TODO information so that we would not forget this.

> 
> Regards
> Jason-JH.Lin
> 
> > 
> > Regards,
> > CK
> > 
> > > ---
> > > Change in v2:
> > > 
> > > 1. remove the DRIVER_RDNDER flag for mtk_drm_ioctl
> > > 2. move cmdq_insert_backup_cookie into client driver
> > > 3. move secure gce node define from mt8195-cherry.dtsi to
> > > mt8195.dtsi
> > > ---
> > > 
> > > CK Hu (1):
> > >   drm/mediatek: Add interface to allocate MediaTek GEM buffer.
> > > 
> > > Jason-JH.Lin (10):
> > >   drm/mediatek/uapi: Add DRM_MTK_GEM_CREATED_ENCRYPTTED flag
> > >   drm/mediatek: Add secure buffer control flow to mtk_drm_gem
> > >   drm/mediatek: Add secure identify flag and funcution to
> > > mtk_drm_plane
> > >   drm/mediatek: Add mtk_ddp_sec_write to config secure buffer
> > > info
> > >   drm/mediatek: Add get_sec_port interface to mtk_ddp_comp
> > >   drm/mediatek: Add secure layer config support for ovl
> > >   drm/mediatek: Add secure layer config support for ovl_adaptor
> > >   drm/mediatek: Add secure flow support to mediatek-drm
> > >   drm/mediatek: Add cmdq_insert_backup_cookie before secure pkt
> > > finalize
> > >   arm64: dts: mt8195: Add secure mbox settings for vdosys
> > > 
> > >  arch/arm64/boot/dts/mediatek/mt8195.dtsi      |   6 +-
> > >  drivers/gpu/drm/mediatek/mtk_disp_drv.h       |   3 +
> > >  drivers/gpu/drm/mediatek/mtk_disp_ovl.c       |  31 +-
> > >  .../gpu/drm/mediatek/mtk_disp_ovl_adaptor.c   |  15 +
> > >  drivers/gpu/drm/mediatek/mtk_drm_crtc.c       | 274
> > > +++++++++++++++++-
> > >  drivers/gpu/drm/mediatek/mtk_drm_crtc.h       |   1 +
> > >  drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.c   |  14 +
> > >  drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.h   |  13 +
> > >  drivers/gpu/drm/mediatek/mtk_drm_drv.c        |  13 +
> > >  drivers/gpu/drm/mediatek/mtk_drm_gem.c        | 121 ++++++++
> > >  drivers/gpu/drm/mediatek/mtk_drm_gem.h        |  16 +
> > >  drivers/gpu/drm/mediatek/mtk_drm_plane.c      |   7 +
> > >  drivers/gpu/drm/mediatek/mtk_drm_plane.h      |   2 +
> > >  drivers/gpu/drm/mediatek/mtk_mdp_rdma.c       |  11 +-
> > >  drivers/gpu/drm/mediatek/mtk_mdp_rdma.h       |   2 +
> > >  include/uapi/drm/mediatek_drm.h               |  59 ++++
> > >  16 files changed, 570 insertions(+), 18 deletions(-)
> > >  create mode 100644 include/uapi/drm/mediatek_drm.h
> > > 