[PATCH v2 4/4] drm/xe/xe2: Add performance tuning for L3 cache flushing

[Gustavo Sousa]

A recommended performance tuning for LNL related to L3 cache flushing
was recently introduced in Bspec. Implement it.

v2:
  - Fix reference to Bspec. (Sai Teja, Tejas)
  - Use correct register name for "Tuning: L3 RW flush all Cache". (Sai
    Teja)
  - Use SCRATCH3_LBCF (with the underscore) for better readability.

Bspec: 72161
Cc: Sai Teja Pottumuttu <sai.teja.pottumuttu at intel.com>
Cc: Tejas Upadhyay <tejas.upadhyay at intel.com>
Signed-off-by: Gustavo Sousa <gustavo.sousa at intel.com>
---
 drivers/gpu/drm/xe/regs/xe_gt_regs.h | 5 +++++
 drivers/gpu/drm/xe/xe_tuning.c       | 8 ++++++++
 2 files changed, 13 insertions(+)

diff --git a/drivers/gpu/drm/xe/regs/xe_gt_regs.h b/drivers/gpu/drm/xe/regs/xe_gt_regs.h
index 07315eb72eff..8d8f6a113a86 100644
--- a/drivers/gpu/drm/xe/regs/xe_gt_regs.h
+++ b/drivers/gpu/drm/xe/regs/xe_gt_regs.h
@@ -388,6 +388,9 @@
 #define L3SQCREG3				XE_REG_MCR(0xb108)
 #define   COMPPWOVERFETCHEN			REG_BIT(28)
 
+#define SCRATCH3_LBCF				XE_REG_MCR(0xb154)
+#define   RWFLUSHALLEN				REG_BIT(17)
+
 #define XEHP_L3SQCREG5				XE_REG_MCR(0xb158)
 #define   L3_PWM_TIMER_INIT_VAL_MASK		REG_GENMASK(9, 0)
 
@@ -405,6 +408,8 @@
 
 #define XE2LPM_L3SQCREG3			XE_REG_MCR(0xb608)
 
+#define XE2LPM_SCRATCH3_LBCF			XE_REG_MCR(0xb654)
+
 #define XE2LPM_L3SQCREG5			XE_REG_MCR(0xb658)
 
 #define XE2_TDF_CTRL				XE_REG(0xb418)
diff --git a/drivers/gpu/drm/xe/xe_tuning.c b/drivers/gpu/drm/xe/xe_tuning.c
index 230369f108ab..39f50b6f94ce 100644
--- a/drivers/gpu/drm/xe/xe_tuning.c
+++ b/drivers/gpu/drm/xe/xe_tuning.c
@@ -75,6 +75,14 @@ static const struct xe_rtp_entry_sr gt_tunings[] = {
 	  XE_RTP_ACTIONS(FIELD_SET(STATELESS_COMPRESSION_CTRL, UNIFIED_COMPRESSION_FORMAT,
 				   REG_FIELD_PREP(UNIFIED_COMPRESSION_FORMAT, 0)))
 	},
+	{ XE_RTP_NAME("Tuning: L3 RW flush all Cache"),
+	  XE_RTP_RULES(GRAPHICS_VERSION_RANGE(2004, XE_RTP_END_VERSION_UNDEFINED)),
+	  XE_RTP_ACTIONS(SET(SCRATCH3_LBCF, RWFLUSHALLEN))
+	},
+	{ XE_RTP_NAME("Tuning: L3 RW flush all cache - media"),
+	  XE_RTP_RULES(MEDIA_VERSION_RANGE(2000, XE_RTP_END_VERSION_UNDEFINED)),
+	  XE_RTP_ACTIONS(SET(XE2LPM_SCRATCH3_LBCF, RWFLUSHALLEN))
+	},
 
 	{}
 };
-- 
2.46.1