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drm/xe: Disable timestamp WA on VFs

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The timestamp WA does not work on a VF because it requires reading MMIO
registers, which are inaccessible on a VF. This timestamp WA confuses
LRC sampling on a VF during TDR, as the LRC timestamp would always read
as 1 for any active context. Disable the timestamp WA on VFs to avoid
this confusion.

Signed-off-by: Matthew Brost <matthew.brost@intel.com>
Reviewed-by: Umesh Nerlige Ramappa <umesh.nerlige.ramappa@intel.com>
Fixes: 617d824c53 ("drm/xe: Add WA BB to capture active context utilization")
Link: https://patch.msgid.link/20260110012739.2888434-7-matthew.brost@intel.com
(cherry picked from commit efffd56e4b)
Signed-off-by: Thomas Hellström <thomas.hellstrom@linux.intel.com>
This commit is contained in:
Matthew Brost
2026-01-09 17:27:38 -08:00
committed by Thomas Hellström
parent 47bf28e22a
commit b886aa65ea
1 changed files with 3 additions and 0 deletions
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3
drivers/gpu/drm/xe/xe_lrc.c
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@@ -1050,6 +1050,9 @@ static ssize_t setup_utilization_wa(struct xe_lrc *lrc,
{
u32 *cmd = batch;
if (IS_SRIOV_VF(gt_to_xe(lrc->gt)))
return 0;
if (xe_gt_WARN_ON(lrc->gt, max_len < 12))
return -ENOSPC;