drm/i915/icl: WaModifyGamTlbPartitioning

Adjust default GAM TLB partitioning for performance reasons.

v2: Only touch the bits that we really need
v3: Rebased on top of the WA refactoring
v4:
  - Added References (Mika)
  - Rebased
v5:
  - Rebased
  - C, not lisp (Chris)
  - Correct reference number (Mika)

References: HSDES#220160670
Signed-off-by: Oscar Mateo <oscar.mateo@intel.com>
Reviewed-by: Mika Kuoppala <mika.kuoppala@linux.intel.com>
Signed-off-by: Mika Kuoppala <mika.kuoppala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/1525814984-20039-6-git-send-email-oscar.mateo@intel.com

2 files changed, 10 insertions, 0 deletions

diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
index 81f1a8c7c0f5..7fe505ce5888 100644
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -8263,6 +8263,11 @@ enum {
 #define GEN10_DFR_RATIO_EN_AND_CHICKEN  _MMIO(0x9550)
 #define   DFR_DISABLE                   (1 << 9)
 
+#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_workarounds.c b/drivers/gpu/drm/i915/intel_workarounds.c
index 3b037298ff99..2561c55043c5 100644
--- a/drivers/gpu/drm/i915/intel_workarounds.c
+++ b/drivers/gpu/drm/i915/intel_workarounds.c
@@ -715,6 +715,11 @@ static void icl_gt_workarounds_apply(struct drm_i915_private *dev_priv)
         I915_WRITE(GEN11_GLBLINVL,
                    (I915_READ(GEN11_GLBLINVL) & ~GEN11_BANK_HASH_ADDR_EXCL_MASK) |
                    GEN11_BANK_HASH_ADDR_EXCL_BIT0);
+
+        /* 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);
 }
 
 void intel_gt_workarounds_apply(struct drm_i915_private *dev_priv)