drm/i915: take a ref to the rpm in the uncore structure

Remove a bit of pointer dancing in the reg access path.
Signed-off-by: Daniele Ceraolo Spurio <daniele.ceraolospurio@intel.com>
Cc: Paulo Zanoni <paulo.r.zanoni@intel.com>
Cc: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Link: https://patchwork.freedesktop.org/patch/msgid/20190325214940.23632-5-daniele.ceraolospurio@intel.com

drivers/gpu/drm/i915/intel_drv.h

@@ -2269,20 +2269,26 @@ void icl_dbuf_slices_update(struct drm_i915_private *dev_priv,
 			    u8 req_slices);
 
 static inline void
-assert_rpm_device_not_suspended(struct drm_i915_private *i915)
+assert_rpm_device_not_suspended(struct i915_runtime_pm *rpm)
 {
-	WARN_ONCE(i915->runtime_pm.suspended,
+	WARN_ONCE(rpm->suspended,
 		  "Device suspended during HW access\n");
 }
 
 static inline void
-assert_rpm_wakelock_held(struct drm_i915_private *i915)
+__assert_rpm_wakelock_held(struct i915_runtime_pm *rpm)
 {
-	assert_rpm_device_not_suspended(i915);
-	WARN_ONCE(!atomic_read(&i915->runtime_pm.wakeref_count),
+	assert_rpm_device_not_suspended(rpm);
+	WARN_ONCE(!atomic_read(&rpm->wakeref_count),
 		  "RPM wakelock ref not held during HW access");
 }
 
+static inline void
+assert_rpm_wakelock_held(struct drm_i915_private *i915)
+{
+	__assert_rpm_wakelock_held(&i915->runtime_pm);
+}
+
 /**
  * disable_rpm_wakeref_asserts - disable the RPM assert checks
  * @i915: i915 device instance

drivers/gpu/drm/i915/intel_uncore.c

@@ -342,7 +342,7 @@ intel_uncore_fw_release_timer(struct hrtimer *timer)
 	struct intel_uncore *uncore = forcewake_domain_to_uncore(domain);
 	unsigned long irqflags;
 
-	assert_rpm_device_not_suspended(uncore_to_i915(uncore));
+	assert_rpm_device_not_suspended(uncore->rpm);
 
 	if (xchg(&domain->active, false))
 		return HRTIMER_RESTART;
@@ -623,7 +623,7 @@ void intel_uncore_forcewake_get(struct intel_uncore *uncore,
 	if (!uncore->funcs.force_wake_get)
 		return;
 
-	assert_rpm_wakelock_held(uncore_to_i915(uncore));
+	__assert_rpm_wakelock_held(uncore->rpm);
 
 	spin_lock_irqsave(&uncore->lock, irqflags);
 	__intel_uncore_forcewake_get(uncore, fw_domains);
@@ -777,7 +777,7 @@ void assert_forcewakes_active(struct intel_uncore *uncore,
 	if (!uncore->funcs.force_wake_get)
 		return;
 
-	assert_rpm_wakelock_held(uncore_to_i915(uncore));
+	__assert_rpm_wakelock_held(uncore->rpm);
 
 	fw_domains &= uncore->fw_domains;
 	WARN(fw_domains & ~uncore->fw_domains_active,
@@ -1095,7 +1095,7 @@ unclaimed_reg_debug(struct intel_uncore *uncore,
 #define GEN2_READ_HEADER(x) \
 	struct intel_uncore *uncore = &dev_priv->uncore; \
 	u##x val = 0; \
-	assert_rpm_wakelock_held(dev_priv);
+	__assert_rpm_wakelock_held(uncore->rpm);
 
 #define GEN2_READ_FOOTER \
 	trace_i915_reg_rw(false, reg, val, sizeof(val), trace); \
@@ -1138,7 +1138,7 @@ __gen2_read(64)
 	u32 offset = i915_mmio_reg_offset(reg); \
 	unsigned long irqflags; \
 	u##x val = 0; \
-	assert_rpm_wakelock_held(dev_priv); \
+	__assert_rpm_wakelock_held(uncore->rpm); \
 	spin_lock_irqsave(&uncore->lock, irqflags); \
 	unclaimed_reg_debug(uncore, reg, true, true)
 
@@ -1213,7 +1213,7 @@ __gen6_read(64)
 #define GEN2_WRITE_HEADER \
 	struct intel_uncore *uncore = &dev_priv->uncore; \
 	trace_i915_reg_rw(true, reg, val, sizeof(val), trace); \
-	assert_rpm_wakelock_held(dev_priv); \
+	__assert_rpm_wakelock_held(uncore->rpm); \
 
 #define GEN2_WRITE_FOOTER
 
@@ -1252,7 +1252,7 @@ __gen2_write(32)
 	u32 offset = i915_mmio_reg_offset(reg); \
 	unsigned long irqflags; \
 	trace_i915_reg_rw(true, reg, val, sizeof(val), trace); \
-	assert_rpm_wakelock_held(dev_priv); \
+	__assert_rpm_wakelock_held(uncore->rpm); \
 	spin_lock_irqsave(&uncore->lock, irqflags); \
 	unclaimed_reg_debug(uncore, reg, false, true)
 
@@ -1596,6 +1596,8 @@ int intel_uncore_init(struct intel_uncore *uncore)
 	uncore->pmic_bus_access_nb.notifier_call =
 		i915_pmic_bus_access_notifier;
 
+	uncore->rpm = &i915->runtime_pm;
+
 	if (!intel_uncore_has_forcewake(uncore)) {
 		if (IS_GEN(i915, 5)) {
 			ASSIGN_WRITE_MMIO_VFUNCS(uncore, gen5);

drivers/gpu/drm/i915/intel_uncore.h

@@ -32,6 +32,7 @@
 #include "i915_reg.h"
 
 struct drm_i915_private;
+struct i915_runtime_pm;
 struct intel_uncore;
 
 enum forcewake_domain_id {
@@ -95,6 +96,8 @@ struct intel_forcewake_range {
 struct intel_uncore {
 	void __iomem *regs;
 
+	struct i915_runtime_pm *rpm;
+
 	spinlock_t lock; /** lock is also taken in irq contexts. */
 
 	unsigned int flags;