drm/i915/kbl: Add WaDisableLSQCROPERFforOCL

Extend the scope of this workaround, already used in skl,
to also take effect in kbl.

v2: Fix KBL_REVID_E0 (Matthew)

References: HSD#2132677
Cc: Matthew Auld <matthew.william.auld@gmail.com>
Signed-off-by: Mika Kuoppala <mika.kuoppala@intel.com>
Reviewed-by: Matthew Auld <matthew.auld@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1465309159-30531-12-git-send-email-mika.kuoppala@intel.com

drivers/gpu/drm/i915/i915_drv.h

@@ -2719,6 +2719,9 @@ struct drm_i915_cmd_table {
 
 #define KBL_REVID_A0		0x0
 #define KBL_REVID_B0		0x1
+#define KBL_REVID_C0		0x2
+#define KBL_REVID_D0		0x3
+#define KBL_REVID_E0		0x4
 
 #define IS_KBL_REVID(p, since, until) \
 	(IS_KABYLAKE(p) && IS_REVID(p, since, until))

drivers/gpu/drm/i915/intel_lrc.c

@@ -1075,12 +1075,13 @@ static inline int gen8_emit_flush_coherentl3_wa(struct intel_engine_cs *engine,
 	uint32_t l3sqc4_flush = (0x40400000 | GEN8_LQSC_FLUSH_COHERENT_LINES);
 
 	/*
-	 * WaDisableLSQCROPERFforOCL:skl
+	 * WaDisableLSQCROPERFforOCL:skl,kbl
 	 * This WA is implemented in skl_init_clock_gating() but since
 	 * this batch updates GEN8_L3SQCREG4 with default value we need to
 	 * set this bit here to retain the WA during flush.
 	 */
-	if (IS_SKL_REVID(engine->i915, 0, SKL_REVID_E0))
+	if (IS_SKL_REVID(engine->i915, 0, SKL_REVID_E0) ||
+	    IS_KBL_REVID(engine->i915, 0, KBL_REVID_E0))
 		l3sqc4_flush |= GEN8_LQSC_RO_PERF_DIS;
 
 	wa_ctx_emit(batch, index, (MI_STORE_REGISTER_MEM_GEN8 |

drivers/gpu/drm/i915/intel_ringbuffer.c

@@ -1204,6 +1204,19 @@ static int kbl_init_workarounds(struct intel_engine_cs *engine)
 		WA_SET_BIT_MASKED(HDC_CHICKEN0,
 				  HDC_FENCE_DEST_SLM_DISABLE);
 
+	/* GEN8_L3SQCREG4 has a dependency with WA batch so any new changes
+	 * involving this register should also be added to WA batch as required.
+	 */
+	if (IS_KBL_REVID(dev_priv, 0, KBL_REVID_E0))
+		/* WaDisableLSQCROPERFforOCL:kbl */
+		I915_WRITE(GEN8_L3SQCREG4, I915_READ(GEN8_L3SQCREG4) |
+			   GEN8_LQSC_RO_PERF_DIS);
+
+	/* WaDisableLSQCROPERFforOCL:kbl */
+	ret = wa_ring_whitelist_reg(engine, GEN8_L3SQCREG4);
+	if (ret)
+		return ret;
+
 	return 0;
 }