[PATCH v3 07/15] drm/xe/xe3p_lpg: Disable reporting of context switch status to GHWSP

Gustavo Sousa
2026-02-06T18:36:40Z

From: Matt Roper <matthew.d.roper@intel.com>

By default the hardware reports context switch status into the global
hardware status page. The Xe driver doesn't use this information for
anything, and as of Xe3p, leaving this setting enabled will prevent
other hardware optimizations from being enabled. Disable this reporting
as suggested by the tuning guide.

Bspec: 72161
Signed-off-by: Matt Roper <matthew.d.roper@intel.com>
Reviewed-by: Matt Atwood <matthew.s.atwood@intel.com>
Signed-off-by: Gustavo Sousa <gustavo.sousa@intel.com>
---
drivers/gpu/drm/xe/xe_tuning.c | 7 +++++++
1 file changed, 7 insertions(+)

diff --git a/drivers/gpu/drm/xe/xe_tuning.c b/drivers/gpu/drm/xe/xe_tuning.c
index 5766fa7742d3..a97872b3214b 100644
--- a/drivers/gpu/drm/xe/xe_tuning.c
+++ b/drivers/gpu/drm/xe/xe_tuning.c
@@ -10,6 +10,7 @@
#include <drm/drm_managed.h>
#include <drm/drm_print.h>

+#include "regs/xe_engine_regs.h"
#include "regs/xe_gt_regs.h"
#include "xe_gt_types.h"
#include "xe_platform_types.h"
@@ -107,6 +108,12 @@ static const struct xe_rtp_entry_sr engine_tunings[] = {
FUNC(xe_rtp_match_first_render_or_compute)),
XE_RTP_ACTIONS(SET(RT_CTRL, DIS_NULL_QUERY))
},
+ { XE_RTP_NAME("Tuning: disable HW reporting of ctx switch to GHWSP"),
+ XE_RTP_RULES(GRAPHICS_VERSION_RANGE(3500, XE_RTP_END_VERSION_UNDEFINED)),
+ XE_RTP_ACTIONS(SET(CSFE_CHICKEN1(0),
+ GHWSP_CSB_REPORT_DIS,
+ XE_RTP_ACTION_FLAG(ENGINE_BASE)))
+ },
};

static const struct xe_rtp_entry_sr lrc_tunings[] = {

--
2.52.0