From b886aa65eafe3098bbd691f0ca4a9abce03f9d03 Mon Sep 17 00:00:00 2001 From: Matthew Brost Date: Fri, 9 Jan 2026 17:27:38 -0800 Subject: [PATCH] drm/xe: Disable timestamp WA on VFs MIME-Version: 1.0 Content-Type: text/plain; charset=utf8 Content-Transfer-Encoding: 8bit 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 Reviewed-by: Umesh Nerlige Ramappa Fixes: 617d824c5323 ("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 efffd56e4bd894e0935eea00e437f233b6cebc0d) Signed-off-by: Thomas Hellström --- drivers/gpu/drm/xe/xe_lrc.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/drivers/gpu/drm/xe/xe_lrc.c b/drivers/gpu/drm/xe/xe_lrc.c index b5083c99dd50..281286f2b5f9 100644 --- a/drivers/gpu/drm/xe/xe_lrc.c +++ b/drivers/gpu/drm/xe/xe_lrc.c @@ -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; -- 2.47.3