[Intel-gfx] [PATCH 03/14] drm/i915/icl: WaModifyGamTlbPartitioning

[Oscar Mateo]

Adjust default GAM TLB partitioning for performance reasons.

v2: Only touch the bits that we really need

Cc: Mika Kuoppala <mika.kuoppala at linux.intel.com>
Signed-off-by: Oscar Mateo <oscar.mateo at intel.com>
---
 drivers/gpu/drm/i915/i915_reg.h | 5 +++++
 drivers/gpu/drm/i915/intel_pm.c | 5 +++++
 2 files changed, 10 insertions(+)

diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
index cd5da2b..78abb49 100644
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -8200,6 +8200,11 @@ enum {
 #define   GEN9_GAPS_TSV_CREDIT_DISABLE		(1 << 7)
 #define   GEN11_ARBITRATION_PRIO_ORDER_MASK	(0x3f << 22)
 
+#define GEN11_GACB_PERF_CTRL			_MMIO(0x4B80)
+#define   GEN11_HASH_CTRL_MASK			(0x3 << 12 | 0xf << 0)
+#define   GEN11_HASH_CTRL_BIT0			(1 << 0)
+#define   GEN11_HASH_CTRL_BIT4			(1 << 12)
+
 /* IVYBRIDGE DPF */
 #define GEN7_L3CDERRST1(slice)		_MMIO(0xB008 + (slice) * 0x200) /* L3CD Error Status 1 */
 #define   GEN7_L3CDERRST1_ROW_MASK	(0x7ff<<14)
diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c
index d1b98ae..03c5de3 100644
--- a/drivers/gpu/drm/i915/intel_pm.c
+++ b/drivers/gpu/drm/i915/intel_pm.c
@@ -8518,6 +8518,11 @@ static void icl_init_clock_gating(struct drm_i915_private *dev_priv)
 	 */
 	I915_WRITE(GEN8_GARBCNTL, (I915_READ(GEN8_GARBCNTL) |
 				   GEN11_ARBITRATION_PRIO_ORDER_MASK));
+
+	/* WaModifyGamTlbPartitioning:icl */
+	I915_WRITE(GEN11_GACB_PERF_CTRL,
+		   ((I915_READ(GEN11_GACB_PERF_CTRL) & ~GEN11_HASH_CTRL_MASK) |
+		    GEN11_HASH_CTRL_BIT0 | GEN11_HASH_CTRL_BIT4));
 }
 
 static void cnl_init_clock_gating(struct drm_i915_private *dev_priv)
-- 
1.9.1