drm/xe/mmio: Verify MMIO is available

Browse source

We shouldn't access device registers after the device was unplugged
or the MMIO bar (GTTMMADR) was unmapped. Instead of relying on the
NPD splat due to zeroed tile->mmio.regs, which might be unreliable
anyway as not all xe_mmio structs are using that directly, add an
explicit check during all xe_mmio read/write operations to test if
xe->mmio.regs are still mapped and safely abort with WARN if not.

Signed-off-by: Michal Wajdeczko <michal.wajdeczko@intel.com>
Cc: Matthew Auld <matthew.auld@intel.com>
Reviewed-by: Matthew Auld <matthew.auld@intel.com>
Link: https://patch.msgid.link/20260622132342.19600-2-michal.wajdeczko@intel.com

...

This commit is contained in:

Michal Wajdeczko 2026-06-22 15:23:37 +02:00

parent 645f1a2589

commit 632cdeecdd

1 changed files with 21 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

21

drivers/gpu/drm/xe/xe_mmio.c

View file