drm/i915: Remove identical write mmmio functions

We notice two identical copies of the shadow register table and
following from that removal can also unify CHV and Gen9 write
mmio functions and macros into a single implementation.

v2: Name fwtable consistently and use HAS_FWTABLE. (Joonas Lahtinen)

Signed-off-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>

drivers/gpu/drm/i915/intel_uncore.c

@@ -713,7 +713,7 @@ static const struct intel_forcewake_range __chv_fw_ranges[] = {
 	GEN_FW_RANGE(0x30000, 0x37fff, FORCEWAKE_MEDIA),
 };
 
-#define __chv_reg_write_fw_domains(offset) \
+#define __fwtable_reg_write_fw_domains(offset) \
 ({ \
 	enum forcewake_domains __fwd = 0; \
 	if (NEEDS_FORCE_WAKE((offset)) && !is_gen8_shadowed(offset)) \
@@ -757,34 +757,6 @@ static const struct intel_forcewake_range __gen9_fw_ranges[] = {
 	GEN_FW_RANGE(0x30000, 0x3ffff, FORCEWAKE_MEDIA),
 };
 
-static const i915_reg_t gen9_shadowed_regs[] = {
-	RING_TAIL(RENDER_RING_BASE),
-	RING_TAIL(GEN6_BSD_RING_BASE),
-	RING_TAIL(VEBOX_RING_BASE),
-	RING_TAIL(BLT_RING_BASE),
-	GEN6_RPNSWREQ,
-	GEN6_RC_VIDEO_FREQ,
-	/* TODO: Other registers are not yet used */
-};
-
-static bool is_gen9_shadowed(u32 offset)
-{
-	int i;
-	for (i = 0; i < ARRAY_SIZE(gen9_shadowed_regs); i++)
-		if (offset == gen9_shadowed_regs[i].reg)
-			return true;
-
-	return false;
-}
-
-#define __gen9_reg_write_fw_domains(offset) \
-({ \
-	enum forcewake_domains __fwd = 0; \
-	if (NEEDS_FORCE_WAKE((offset)) && !is_gen9_shadowed(offset)) \
-		__fwd = find_fw_domain(dev_priv, offset); \
-	__fwd; \
-})
-
 static void
 ilk_dummy_write(struct drm_i915_private *dev_priv)
 {
@@ -1040,37 +1012,21 @@ gen8_write##x(struct drm_i915_private *dev_priv, i915_reg_t reg, u##x val, bool
 	GEN6_WRITE_FOOTER; \
 }
 
-#define __chv_write(x) \
+#define __fwtable_write(x) \
 static void \
-chv_write##x(struct drm_i915_private *dev_priv, i915_reg_t reg, u##x val, bool trace) { \
+fwtable_write##x(struct drm_i915_private *dev_priv, i915_reg_t reg, u##x val, bool trace) { \
 	enum forcewake_domains fw_engine; \
 	GEN6_WRITE_HEADER; \
-	fw_engine = __chv_reg_write_fw_domains(offset); \
+	fw_engine = __fwtable_reg_write_fw_domains(offset); \
 	if (fw_engine) \
 		__force_wake_auto(dev_priv, fw_engine); \
 	__raw_i915_write##x(dev_priv, reg, val); \
 	GEN6_WRITE_FOOTER; \
 }
 
-#define __gen9_write(x) \
-static void \
-gen9_write##x(struct drm_i915_private *dev_priv, i915_reg_t reg, u##x val, \
-		bool trace) { \
-	enum forcewake_domains fw_engine; \
-	GEN6_WRITE_HEADER; \
-	fw_engine = __gen9_reg_write_fw_domains(offset); \
-	if (fw_engine) \
-		__force_wake_auto(dev_priv, fw_engine); \
-	__raw_i915_write##x(dev_priv, reg, val); \
-	GEN6_WRITE_FOOTER; \
-}
-
-__gen9_write(8)
-__gen9_write(16)
-__gen9_write(32)
-__chv_write(8)
-__chv_write(16)
-__chv_write(32)
+__fwtable_write(8)
+__fwtable_write(16)
+__fwtable_write(32)
 __gen8_write(8)
 __gen8_write(16)
 __gen8_write(32)
@@ -1078,8 +1034,7 @@ __gen6_write(8)
 __gen6_write(16)
 __gen6_write(32)
 
-#undef __gen9_write
-#undef __chv_write
+#undef __fwtable_write
 #undef __gen8_write
 #undef __gen6_write
 #undef GEN6_WRITE_FOOTER
@@ -1290,13 +1245,13 @@ void intel_uncore_init(struct drm_i915_private *dev_priv)
 	default:
 	case 9:
 		ASSIGN_FW_DOMAINS_TABLE(__gen9_fw_ranges);
-		ASSIGN_WRITE_MMIO_VFUNCS(gen9);
+		ASSIGN_WRITE_MMIO_VFUNCS(fwtable);
 		ASSIGN_READ_MMIO_VFUNCS(fwtable);
 		break;
 	case 8:
 		if (IS_CHERRYVIEW(dev_priv)) {
 			ASSIGN_FW_DOMAINS_TABLE(__chv_fw_ranges);
-			ASSIGN_WRITE_MMIO_VFUNCS(chv);
+			ASSIGN_WRITE_MMIO_VFUNCS(fwtable);
 			ASSIGN_READ_MMIO_VFUNCS(fwtable);
 
 		} else {
@@ -1799,29 +1754,18 @@ static enum forcewake_domains
 intel_uncore_forcewake_for_write(struct drm_i915_private *dev_priv,
 				 i915_reg_t reg)
 {
+	u32 offset = i915_mmio_reg_offset(reg);
 	enum forcewake_domains fw_domains;
 
-	switch (INTEL_GEN(dev_priv)) {
-	case 9:
-		fw_domains = __gen9_reg_write_fw_domains(i915_mmio_reg_offset(reg));
-		break;
-	case 8:
-		if (IS_CHERRYVIEW(dev_priv))
-			fw_domains = __chv_reg_write_fw_domains(i915_mmio_reg_offset(reg));
-		else
-			fw_domains = __gen8_reg_write_fw_domains(i915_mmio_reg_offset(reg));
-		break;
-	case 7:
-	case 6:
+	if (HAS_FWTABLE(dev_priv) && !IS_VALLEYVIEW(dev_priv)) {
+		fw_domains = __fwtable_reg_write_fw_domains(offset);
+	} else if (IS_GEN8(dev_priv)) {
+		fw_domains = __gen8_reg_write_fw_domains(offset);
+	} else if (IS_GEN(dev_priv, 6, 7)) {
 		fw_domains = FORCEWAKE_RENDER;
-		break;
-	default:
-		MISSING_CASE(INTEL_INFO(dev_priv)->gen);
-	case 5:
-	case 4:
-	case 3:
-	case 2:
-		return 0;
+	} else {
+		WARN_ON(!IS_GEN(dev_priv, 2, 5));
+		fw_domains = 0;
 	}
 
 	WARN_ON(fw_domains & ~dev_priv->uncore.fw_domains);