Hello,
This is a follow-up of [1], which was adding the read/write restrictions on GPU buffers. Robin and Steven suggested that I add a flag to restrict the shareability domain on GPU-private buffers, so here it is.
As you can see, the first patch is flagges RFC, since I'm not sure adding a new IOMMU_ flag is the right solution, but IOMMU_CACHE doesn't feel like a good fit either. Please let me know if you have better ideas.
Regards,
Boris
[1]https://patchwork.kernel.org/project/dri-devel/patch/20210930184723.1482426-...
Boris Brezillon (5): [RFC]iommu: Add a IOMMU_DEVONLY protection flag [RFC]iommu/io-pgtable-arm: Take the DEVONLY flag into account on ARM_MALI_LPAE drm/panfrost: Add PANFROST_BO_NO{READ,WRITE} flags drm/panfrost: Add a PANFROST_BO_GPUONLY flag drm/panfrost: Bump the driver version to 1.3
drivers/gpu/drm/panfrost/panfrost_drv.c | 15 +++++++++++++-- drivers/gpu/drm/panfrost/panfrost_gem.c | 3 +++ drivers/gpu/drm/panfrost/panfrost_gem.h | 3 +++ drivers/gpu/drm/panfrost/panfrost_mmu.c | 11 ++++++++++- drivers/iommu/io-pgtable-arm.c | 25 +++++++++++++++++-------- include/linux/iommu.h | 7 +++++++ include/uapi/drm/panfrost_drm.h | 3 +++ 7 files changed, 56 insertions(+), 11 deletions(-)