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This now means KMD can > decompress freely. This was problematic on DG2 since we had > multiple compression formats, and the compression format used > on a particular buffer was unknown to the KMD, so instead the > raw CCS state needed to be copied around when evicting VRAM. > In addition mixed VRAM and system memory buffers were not > supported with compression enabled. > > On Xe2 dGPU compression is still only supported with VRAM, > however we can now support compression with VRAM and system > memory buffers, with GPU access being seamless underneath. > So long as when doing VRAM -> sysmem the KMD does the move > using compressed -> uncompressed, to decompress it. > CPU access to such buffers is also possible, under the premise > that userspace first decompress the corresponding pages being > accessed. If the pages are already in system memory then KMD would > have already decompressed them. When restoring such buffers with > sysmem -> VRAM the KMD can't easily know which pages were originally > compressed, so we always use uncompressed -> uncompressed here. > With this it also means we can drop all the raw CCS handling > on such platforms (including needing to allocate extra CCS storage). > > In order to support this we now need to have two different identity > mappings for compressed and uncompressed VRAM. > The additional identity map is the VRAM with compressed pat_index. > We then select the appropriate mapping during migration/clear. > Have gone through all the patches. Please address indentation and checkpatch errors. With above addressed all patches lgtm. Reviewed-by: Himal Prasad Ghimiray > Akshata Jahagirdar (6): > drm/xe/xe2: Introduce identity map for compressed pat for vram > drm/xe/migrate: Handle clear ccs logic for xe2 dgfx > drm/xe/migrate: Add kunit to test clear functionality > drm/xe/xe_migrate: Handle migration logic for xe2+ dgfx > drm/xe/migrate: Add kunit to test migration functionality for BMG > drm/xe/xe2: Do not run xe_bo_test for xe2+ dgfx > > drivers/gpu/drm/xe/tests/xe_bo.c | 6 + > drivers/gpu/drm/xe/tests/xe_migrate.c | 388 +++++++++++++++++++++ > drivers/gpu/drm/xe/tests/xe_migrate_test.c | 1 + > drivers/gpu/drm/xe/tests/xe_migrate_test.h | 1 + > drivers/gpu/drm/xe/xe_device.h | 5 + > drivers/gpu/drm/xe/xe_migrate.c | 66 +++- > 6 files changed, 449 insertions(+), 18 deletions(-) >