[RFC PATCH 0/2] LNL_FLUSH_* enhancements

[Matthew Brost <matthew.brost@intel.com>]

The LNL_FLUSH_* workaround is a horrid hack that has been papering over
bugs. Let's limit its scope to determine whether it is actually needed
on newer platforms and add more debug information for cases where it
still occurs.

This came up again in the context of this series [1].

Matt

[1] https://patchwork.freedesktop.org/series/170916/ 

Matthew Brost (2):
  drm/xe: Scope LNL_FLUSH_* workaround to affected CPUs, not GPU
    platform
  drm/xe: Add DRM_XE_DEBUG_FLUSH_WA to force the CPU flush workaround on

 drivers/gpu/drm/xe/Kconfig.debug        | 16 ++++++
 drivers/gpu/drm/xe/Makefile             |  1 +
 drivers/gpu/drm/xe/xe_cpu_info.c        | 67 +++++++++++++++++++++++++
 drivers/gpu/drm/xe/xe_cpu_info.h        | 13 +++++
 drivers/gpu/drm/xe/xe_device.h          | 35 +++++++++----
 drivers/gpu/drm/xe/xe_device_types.h    | 10 ++++
 drivers/gpu/drm/xe/xe_guc_ct.c          | 56 +++++++++++++++++++--
 drivers/gpu/drm/xe/xe_guc_ct.h          |  1 +
 drivers/gpu/drm/xe/xe_guc_tlb_inval.c   |  2 +-
 drivers/gpu/drm/xe/xe_pci.c             | 10 ++++
 drivers/gpu/drm/xe/xe_tlb_inval.c       | 28 +++++++++++
 drivers/gpu/drm/xe/xe_wait_user_fence.c |  6 ++-
 12 files changed, 228 insertions(+), 17 deletions(-)
 create mode 100644 drivers/gpu/drm/xe/xe_cpu_info.c
 create mode 100644 drivers/gpu/drm/xe/xe_cpu_info.h

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2.34.1