drm/xe/guc_ads: use uncached mapping for UM queue BO

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On Pre-Xe3p platform, the GAM write the UM queue through DPA using UC.
if GuC reads the queue via GGTT (WB), stale data may be observed
when the cacheline has been polluted by another agent.

To match the GAM's UC writes, configure the GuC mapping as UC as well.

Fixes: 9c57bc0865 ("drm/xe/lnl: Drop force_probe requirement")
Cc: Gwan-gyeong Mun <gwan-gyeong.mun@intel.com>
Cc: Matthew Auld <matthew.auld@intel.com>
Cc: <stable@vger.kernel.org> # v6.12+
Signed-off-by: Jia Yao <jia.yao@intel.com>
Reviewed by: Matthew Auld <matthew.auld@intel.com>
Signed-off-by: Matthew Auld <matthew.auld@intel.com>
Link: https://patch.msgid.link/20260804165057.129529-4-jia.yao@intel.com
(cherry picked from commit 9daa302a82)
Signed-off-by: Thomas Hellström <thomas.hellstrom@linux.intel.com>

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Jia Yao 2026-08-04 16:50:57 +00:00 • committed by Thomas Hellström

parent f342810a14

commit 8d5134ae41

1 changed files with 2 additions and 1 deletions

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drivers/gpu/drm/xe/xe_guc_ads.c

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