drm/xe/vf: Shadow buffer management for CCS read/write operations

Browse source

CCS copy command consist of 5-dword sequence. If vCPU halts during
save/restore operations while these sequences are being programmed,
incomplete writes can cause page faults during IGPU CCS metadata saving.

Use shadow buffer management to prevent partial write issues during CCS
operations.

Signed-off-by: Satyanarayana K V P <satyanarayana.k.v.p@intel.com>
Suggested-by: Matthew Brost <matthew.brost@intel.com>
Cc: Michal Wajdeczko <michal.wajdeczko@intel.com>
Cc: Matthew Auld <matthew.auld@intel.com>
Reviewed-by: Matthew Brost <matthew.brost@intel.com>
Signed-off-by: Matthew Brost <matthew.brost@intel.com>
Link: https://patch.msgid.link/20251118120745.3460172-3-satyanarayana.k.v.p@intel.com

...

This commit is contained in:

Satyanarayana K V P 2025-11-18 12:07:45 +00:00 • committed by Matthew Brost

parent 1f2cf5295c

commit fa18290bf0

4 changed files with 73 additions and 7 deletions

Show all changes Ignore whitespace when comparing lines Ignore changes in amount of whitespace Ignore changes in whitespace at EOL

Download patch file Download diff file Expand all files Collapse all files

57

drivers/gpu/drm/xe/xe_migrate.c

View file

3

drivers/gpu/drm/xe/xe_migrate.h

View file

19

drivers/gpu/drm/xe/xe_sriov_vf_ccs.c

View file

1

drivers/gpu/drm/xe/xe_sriov_vf_ccs.h

View file