From: Jason-jh Lin jason-jh.lin@mediatek.corp-partner.google.com
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_RESTRICTED which indicates it should be a 'secure surface'. All changes here are in MediaTek specific code. --- TODO: 1) Drop MTK_DRM_IOCTL_GEM_CREATE and use DMA_HEAP_IOCTL_ALLOC in userspace 2) DRM driver use secure mailbox channel to handle normal and secure flow 3) Implement setting mmsys routing table in the secure world series --- Based on 3 series: [1] v3 dma-buf: heaps: Add MediaTek secure heap - https://patchwork.kernel.org/project/linux-mediatek/list/?series=809023 [2] v6 media: mediatek: add driver to support secure video decoder - https://patchwork.kernel.org/project/linux-mediatek/list/?series=853689 [3] v6 Add CMDQ secure driver for SVP - https://patchwork.kernel.org/project/linux-mediatek/list/?series=855884 --- Change in v6: 1. Rebase to linux-next then rebased on 3 series [1][2][3] 2. Remove some parameter and security settings in normal world 3. Drop secure port related patches 4. Fix some build error and warning
Changes in v5: 1. Sync the local changes
Changes in v4: 1. Rebase on mediatek-drm-next(278640d4d74cd) and fix the conflicts 2. This series is based on 20240129063025.29251-1-yunfei.dong@mediatek.com 3. This series is based on 20240322052829.9893-1-shawn.sung@mediatek.com 4. This series is based on 20240403065603.21920-1-shawn.sung@mediatek.com
Changes in v3: 1. fix kerneldoc problems 2. fix typo in title and commit message 3. adjust naming for secure variable 4. add the missing part for is_suecure plane implementation 5. use BIT_ULL macro to replace bit shifting 6. move modification of ovl_adaptor part to the correct patch 7. add TODO list in commit message 8. add commit message for using share memory to store execute count
Changes 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 (6): drm/mediatek/uapi: Add DRM_MTK_GEM_CREATE_RESTRICTED 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 secure flow support to mediatek-drm drm/mediatek: Add cmdq_insert_backup_cookie before secure pkt finalize
drivers/gpu/drm/mediatek/mtk_crtc.c | 263 +++++++++++++++++- drivers/gpu/drm/mediatek/mtk_crtc.h | 1 + drivers/gpu/drm/mediatek/mtk_ddp_comp.c | 14 + drivers/gpu/drm/mediatek/mtk_ddp_comp.h | 5 + drivers/gpu/drm/mediatek/mtk_disp_ovl.c | 9 +- .../gpu/drm/mediatek/mtk_disp_ovl_adaptor.c | 1 + drivers/gpu/drm/mediatek/mtk_drm_drv.c | 13 +- drivers/gpu/drm/mediatek/mtk_gem.c | 114 ++++++++ drivers/gpu/drm/mediatek/mtk_gem.h | 12 + drivers/gpu/drm/mediatek/mtk_mdp_rdma.c | 8 +- drivers/gpu/drm/mediatek/mtk_mdp_rdma.h | 1 + drivers/gpu/drm/mediatek/mtk_plane.c | 25 ++ drivers/gpu/drm/mediatek/mtk_plane.h | 2 + include/uapi/drm/mediatek_drm.h | 47 ++++ 14 files changed, 500 insertions(+), 15 deletions(-) create mode 100644 include/uapi/drm/mediatek_drm.h