drm/i915/ggtt: Add intel_ggtt_read_entry()

Browse source

The BIOS FB takeover code wants to read out the PTEs (or at least
one of them) to figure out where the FB is located in memory.
Currently we only do that for systems with LMEMBAR, and we've
open coded the PTE decoding in the display code. Introduce a more
proper abstract interface (intel_ggtt_read_entry()) for this purpose,
and implement it for all platforms.

Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20250313140838.29742-5-ville.syrjala@linux.intel.com
Reviewed-by: Jouni Högander <jouni.hogander@intel.com>

...

This commit is contained in:

Ville Syrjälä 2025-03-13 16:08:32 +02:00

parent 8f0d3618c6

commit d1b14231aa

3 changed files with 70 additions and 0 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

56

drivers/gpu/drm/i915/gt/intel_ggtt.c

View file

8

drivers/gpu/drm/i915/gt/intel_ggtt_gmch.c

View file

6

drivers/gpu/drm/i915/gt/intel_gtt.h

View file