[PATCH 4/5] drm/xe/xelp: L3 recommended hashing mask

[Tvrtko Ursulin]

According to the i915 codebase xe missed to set the recommended
performance tuning for L3 hashing which is applicable to all legacy XeLP
platforms. Lets add it.

v2:
 * Rename prefixes to XELP_.
 * Tweak version end point.

v3:
 * Add bspec tag.
 * Tweak version range.

v4:
 * Move from LRC to engine tunings list.

Bspec: 31870
Signed-off-by: Tvrtko Ursulin <tvrtko.ursulin at igalia.com>
References: c46c5fb725be ("drm/i915/gen12: Apply recommended L3 hashing mask")
Cc: Lucas De Marchi <lucas.demarchi at intel.com>
Cc: Matt Roper <matthew.d.roper at intel.com>
---
 drivers/gpu/drm/xe/regs/xe_gt_regs.h | 5 ++++-
 drivers/gpu/drm/xe/xe_tuning.c       | 5 +++++
 2 files changed, 9 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/xe/regs/xe_gt_regs.h b/drivers/gpu/drm/xe/regs/xe_gt_regs.h
index 282afd22b68b..da833a147c0c 100644
--- a/drivers/gpu/drm/xe/regs/xe_gt_regs.h
+++ b/drivers/gpu/drm/xe/regs/xe_gt_regs.h
@@ -365,10 +365,13 @@
 #define FORCEWAKE_MEDIA_VEBOX(n)		XE_REG(0xa560 + (n) * 4)
 #define FORCEWAKE_GSC				XE_REG(0xa618)
 
+/* L3 Cache Control */
+#define XELP_GARBCNTL				XE_REG(0xb004)
+#define   XELP_BUS_HASH_CTL_BIT_EXC		REG_BIT(7)
+
 #define XEHPC_LNCFMISCCFGREG0			XE_REG_MCR(0xb01c, XE_REG_OPTION_MASKED)
 #define   XEHPC_OVRLSCCC			REG_BIT(0)
 
-/* L3 Cache Control */
 #define LNCFCMOCS_REG_COUNT			32
 #define XELP_LNCFCMOCS(i)			XE_REG(0xb020 + (i) * 4)
 #define XEHP_LNCFCMOCS(i)			XE_REG_MCR(0xb020 + (i) * 4)
diff --git a/drivers/gpu/drm/xe/xe_tuning.c b/drivers/gpu/drm/xe/xe_tuning.c
index 3c78f3d71559..551c2f308e1c 100644
--- a/drivers/gpu/drm/xe/xe_tuning.c
+++ b/drivers/gpu/drm/xe/xe_tuning.c
@@ -88,6 +88,11 @@ static const struct xe_rtp_entry_sr gt_tunings[] = {
 };
 
 static const struct xe_rtp_entry_sr engine_tunings[] = {
+	{ XE_RTP_NAME("Tuning: L3 Hashing Mask"),
+	  XE_RTP_RULES(GRAPHICS_VERSION_RANGE(1200, 1210),
+		       FUNC(xe_rtp_match_first_render_or_compute)),
+	  XE_RTP_ACTIONS(CLR(XELP_GARBCNTL, XELP_BUS_HASH_CTL_BIT_EXC))
+	},
 	{ XE_RTP_NAME("Tuning: Set Indirect State Override"),
 	  XE_RTP_RULES(GRAPHICS_VERSION_RANGE(1200, 1274),
 		       ENGINE_CLASS(RENDER)),
-- 
2.48.0