drm/xe/xe3p_lpg: Disable reporting of context switch status to GHWSP

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>
Link: https://patch.msgid.link/20260206-nvl-p-upstreaming-v3-7-636e1ad32688@intel.com
Signed-off-by: Gustavo Sousa <gustavo.sousa@intel.com>

diff --git a/drivers/gpu/drm/xe/xe_tuning.c b/drivers/gpu/drm/xe/xe_tuning.c
index 5766fa7742d313bd26e0b43eaa657d68c31b69cd..a97872b3214b10894d5ec85ab4b3e603ef234bed 100644 (file)
--- 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[] = {