Commit b886aa65 authored by Matthew Brost's avatar Matthew Brost Committed by Thomas Hellström
Browse files

drm/xe: Disable timestamp WA on VFs 



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: default avatarMatthew Brost <matthew.brost@intel.com>
Reviewed-by: default avatarUmesh Nerlige Ramappa <umesh.nerlige.ramappa@intel.com>
Fixes: 617d824c ("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 efffd56e)
Signed-off-by: default avatarThomas Hellström <thomas.hellstrom@linux.intel.com>
parent 47bf28e2

drivers/gpu/drm/xe/xe_lrc.c

+3 −0
Original line number Diff line number Diff line
@@ -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;