drm/i915: Eliminate per-fw_domain i915 backpointer

Pass along the drm_i915_private pointer from the caller, rather than
looking it up from each fw_domain during fw_domains_get/_put. This
allows us to then eliminate the backpointer, in exchange for a more
complicated unwrapping procedure in the rare
intel_uncore_fw_release_timer().
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/20170323101944.21627-1-chris@chris-wilson.co.uk

drivers/gpu/drm/i915/i915_drv.h

@@ -736,17 +736,21 @@ struct intel_uncore_funcs {
 	void (*force_wake_put)(struct drm_i915_private *dev_priv,
 			       enum forcewake_domains domains);
 
-	uint8_t  (*mmio_readb)(struct drm_i915_private *dev_priv, i915_reg_t r, bool trace);
-	uint16_t (*mmio_readw)(struct drm_i915_private *dev_priv, i915_reg_t r, bool trace);
-	uint32_t (*mmio_readl)(struct drm_i915_private *dev_priv, i915_reg_t r, bool trace);
-	uint64_t (*mmio_readq)(struct drm_i915_private *dev_priv, i915_reg_t r, bool trace);
-
-	void (*mmio_writeb)(struct drm_i915_private *dev_priv, i915_reg_t r,
-				uint8_t val, bool trace);
-	void (*mmio_writew)(struct drm_i915_private *dev_priv, i915_reg_t r,
-				uint16_t val, bool trace);
-	void (*mmio_writel)(struct drm_i915_private *dev_priv, i915_reg_t r,
-				uint32_t val, bool trace);
+	uint8_t  (*mmio_readb)(struct drm_i915_private *dev_priv,
+			       i915_reg_t r, bool trace);
+	uint16_t (*mmio_readw)(struct drm_i915_private *dev_priv,
+			       i915_reg_t r, bool trace);
+	uint32_t (*mmio_readl)(struct drm_i915_private *dev_priv,
+			       i915_reg_t r, bool trace);
+	uint64_t (*mmio_readq)(struct drm_i915_private *dev_priv,
+			       i915_reg_t r, bool trace);
+
+	void (*mmio_writeb)(struct drm_i915_private *dev_priv,
+			    i915_reg_t r, uint8_t val, bool trace);
+	void (*mmio_writew)(struct drm_i915_private *dev_priv,
+			    i915_reg_t r, uint16_t val, bool trace);
+	void (*mmio_writel)(struct drm_i915_private *dev_priv,
+			    i915_reg_t r, uint32_t val, bool trace);
 };
 
 struct intel_forcewake_range {
@@ -771,7 +775,6 @@ struct intel_uncore {
 	enum forcewake_domains fw_domains_active;
 
 	struct intel_uncore_forcewake_domain {
-		struct drm_i915_private *i915;
 		enum forcewake_domain_id id;
 		enum forcewake_domains mask;
 		unsigned wake_count;

drivers/gpu/drm/i915/intel_uncore.c

@@ -52,10 +52,11 @@ intel_uncore_forcewake_domain_to_str(const enum forcewake_domain_id id)
 }
 
 static inline void
-fw_domain_reset(const struct intel_uncore_forcewake_domain *d)
+fw_domain_reset(struct drm_i915_private *i915,
+		const struct intel_uncore_forcewake_domain *d)
 {
 	WARN_ON(!i915_mmio_reg_valid(d->reg_set));
-	__raw_i915_write32(d->i915, d->reg_set, d->val_reset);
+	__raw_i915_write32(i915, d->reg_set, d->val_reset);
 }
 
 static inline void
@@ -69,9 +70,10 @@ fw_domain_arm_timer(struct intel_uncore_forcewake_domain *d)
 }
 
 static inline void
-fw_domain_wait_ack_clear(const struct intel_uncore_forcewake_domain *d)
+fw_domain_wait_ack_clear(struct drm_i915_private *i915,
+			 const struct intel_uncore_forcewake_domain *d)
 {
-	if (wait_for_atomic((__raw_i915_read32(d->i915, d->reg_ack) &
+	if (wait_for_atomic((__raw_i915_read32(i915, d->reg_ack) &
 			     FORCEWAKE_KERNEL) == 0,
 			    FORCEWAKE_ACK_TIMEOUT_MS))
 		DRM_ERROR("%s: timed out waiting for forcewake ack to clear.\n",
@@ -79,15 +81,17 @@ fw_domain_wait_ack_clear(const struct intel_uncore_forcewake_domain *d)
 }
 
 static inline void
-fw_domain_get(const struct intel_uncore_forcewake_domain *d)
+fw_domain_get(struct drm_i915_private *i915,
+	      const struct intel_uncore_forcewake_domain *d)
 {
-	__raw_i915_write32(d->i915, d->reg_set, d->val_set);
+	__raw_i915_write32(i915, d->reg_set, d->val_set);
 }
 
 static inline void
-fw_domain_wait_ack(const struct intel_uncore_forcewake_domain *d)
+fw_domain_wait_ack(struct drm_i915_private *i915,
+		   const struct intel_uncore_forcewake_domain *d)
 {
-	if (wait_for_atomic((__raw_i915_read32(d->i915, d->reg_ack) &
+	if (wait_for_atomic((__raw_i915_read32(i915, d->reg_ack) &
 			     FORCEWAKE_KERNEL),
 			    FORCEWAKE_ACK_TIMEOUT_MS))
 		DRM_ERROR("%s: timed out waiting for forcewake ack request.\n",
@@ -95,72 +99,75 @@ fw_domain_wait_ack(const struct intel_uncore_forcewake_domain *d)
 }
 
 static inline void
-fw_domain_put(const struct intel_uncore_forcewake_domain *d)
+fw_domain_put(struct drm_i915_private *i915,
+	      const struct intel_uncore_forcewake_domain *d)
 {
-	__raw_i915_write32(d->i915, d->reg_set, d->val_clear);
+	__raw_i915_write32(i915, d->reg_set, d->val_clear);
 }
 
 static inline void
-fw_domain_posting_read(const struct intel_uncore_forcewake_domain *d)
+fw_domain_posting_read(struct drm_i915_private *i915,
+		       const struct intel_uncore_forcewake_domain *d)
 {
 	/* something from same cacheline, but not from the set register */
 	if (i915_mmio_reg_valid(d->reg_post))
-		__raw_posting_read(d->i915, d->reg_post);
+		__raw_posting_read(i915, d->reg_post);
 }
 
 static void
-fw_domains_get(struct drm_i915_private *dev_priv, enum forcewake_domains fw_domains)
+fw_domains_get(struct drm_i915_private *i915, enum forcewake_domains fw_domains)
 {
 	struct intel_uncore_forcewake_domain *d;
 
-	for_each_fw_domain_masked(d, fw_domains, dev_priv) {
-		fw_domain_wait_ack_clear(d);
-		fw_domain_get(d);
+	for_each_fw_domain_masked(d, fw_domains, i915) {
+		fw_domain_wait_ack_clear(i915, d);
+		fw_domain_get(i915, d);
 	}
 
-	for_each_fw_domain_masked(d, fw_domains, dev_priv)
-		fw_domain_wait_ack(d);
+	for_each_fw_domain_masked(d, fw_domains, i915)
+		fw_domain_wait_ack(i915, d);
 
-	dev_priv->uncore.fw_domains_active |= fw_domains;
+	i915->uncore.fw_domains_active |= fw_domains;
 }
 
 static void
-fw_domains_put(struct drm_i915_private *dev_priv, enum forcewake_domains fw_domains)
+fw_domains_put(struct drm_i915_private *i915, enum forcewake_domains fw_domains)
 {
 	struct intel_uncore_forcewake_domain *d;
 
-	for_each_fw_domain_masked(d, fw_domains, dev_priv) {
-		fw_domain_put(d);
-		fw_domain_posting_read(d);
+	for_each_fw_domain_masked(d, fw_domains, i915) {
+		fw_domain_put(i915, d);
+		fw_domain_posting_read(i915, d);
 	}
 
-	dev_priv->uncore.fw_domains_active &= ~fw_domains;
+	i915->uncore.fw_domains_active &= ~fw_domains;
 }
 
 static void
-fw_domains_posting_read(struct drm_i915_private *dev_priv)
+fw_domains_posting_read(struct drm_i915_private *i915)
 {
 	struct intel_uncore_forcewake_domain *d;
 
 	/* No need to do for all, just do for first found */
-	for_each_fw_domain(d, dev_priv) {
-		fw_domain_posting_read(d);
+	for_each_fw_domain(d, i915) {
+		fw_domain_posting_read(i915, d);
 		break;
 	}
 }
 
 static void
-fw_domains_reset(struct drm_i915_private *dev_priv, enum forcewake_domains fw_domains)
+fw_domains_reset(struct drm_i915_private *i915,
+		 enum forcewake_domains fw_domains)
 {
 	struct intel_uncore_forcewake_domain *d;
 
-	if (dev_priv->uncore.fw_domains == 0)
+	if (i915->uncore.fw_domains == 0)
 		return;
 
-	for_each_fw_domain_masked(d, fw_domains, dev_priv)
-		fw_domain_reset(d);
+	for_each_fw_domain_masked(d, fw_domains, i915)
+		fw_domain_reset(i915, d);
 
-	fw_domains_posting_read(dev_priv);
+	fw_domains_posting_read(i915);
 }
 
 static void __gen6_gt_wait_for_thread_c0(struct drm_i915_private *dev_priv)
@@ -236,7 +243,8 @@ intel_uncore_fw_release_timer(struct hrtimer *timer)
 {
 	struct intel_uncore_forcewake_domain *domain =
 	       container_of(timer, struct intel_uncore_forcewake_domain, timer);
-	struct drm_i915_private *dev_priv = domain->i915;
+	struct drm_i915_private *dev_priv =
+		container_of(domain, struct drm_i915_private, uncore.fw_domain[domain->id]);
 	unsigned long irqflags;
 
 	assert_rpm_device_not_suspended(dev_priv);
@@ -1161,7 +1169,6 @@ static void fw_domain_init(struct drm_i915_private *dev_priv,
 	else if (IS_GEN6(dev_priv) || IS_GEN7(dev_priv) || IS_GEN8(dev_priv))
 		d->reg_post = ECOBUS;
 
-	d->i915 = dev_priv;
 	d->id = domain_id;
 
 	BUILD_BUG_ON(FORCEWAKE_RENDER != (1 << FW_DOMAIN_ID_RENDER));
@@ -1175,7 +1182,7 @@ static void fw_domain_init(struct drm_i915_private *dev_priv,
 
 	dev_priv->uncore.fw_domains |= (1 << domain_id);
 
-	fw_domain_reset(d);
+	fw_domain_reset(dev_priv, d);
 }
 
 static void intel_uncore_fw_domains_init(struct drm_i915_private *dev_priv)