drm/i915: add helper for checking whether IRQs are enabled

Now that we use the runtime IRQ enable/disable functions in our suspend
path, we can simply check the pm._irqs_disabled flag everywhere.  So
rename it to catch the users, and add an inline for it to make the
checks clear everywhere.

Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
Reviewed-by: Paulo Zanoni <paulo.r.zanoni@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

drivers/gpu/drm/i915/i915_debugfs.c

@@ -1996,7 +1996,7 @@ static int i915_pc8_status(struct seq_file *m, void *unused)
 
 	seq_printf(m, "GPU idle: %s\n", yesno(!dev_priv->mm.busy));
 	seq_printf(m, "IRQs disabled: %s\n",
-		   yesno(dev_priv->pm.irqs_disabled));
+		   yesno(!intel_irqs_enabled(dev_priv)));
 
 	return 0;
 }

drivers/gpu/drm/i915/i915_drv.h

@@ -1339,7 +1339,7 @@ struct ilk_wm_values {
  */
 struct i915_runtime_pm {
 	bool suspended;
-	bool irqs_disabled;
+	bool _irqs_disabled;
 };
 
 enum intel_pipe_crc_source {

drivers/gpu/drm/i915/i915_gem.c

@@ -1161,7 +1161,7 @@ static int __wait_seqno(struct intel_engine_cs *ring, u32 seqno,
 	unsigned long timeout_expire;
 	int ret;
 
-	WARN(dev_priv->pm.irqs_disabled, "IRQs disabled\n");
+	WARN(!intel_irqs_enabled(dev_priv), "IRQs disabled");
 
 	if (i915_seqno_passed(ring->get_seqno(ring, true), seqno))
 		return 0;

drivers/gpu/drm/i915/i915_irq.c

@@ -136,7 +136,7 @@ ironlake_enable_display_irq(struct drm_i915_private *dev_priv, u32 mask)
 {
 	assert_spin_locked(&dev_priv->irq_lock);
 
-	if (WARN_ON(dev_priv->pm.irqs_disabled))
+	if (WARN_ON(!intel_irqs_enabled(dev_priv)))
 		return;
 
 	if ((dev_priv->irq_mask & mask) != 0) {
@@ -151,7 +151,7 @@ ironlake_disable_display_irq(struct drm_i915_private *dev_priv, u32 mask)
 {
 	assert_spin_locked(&dev_priv->irq_lock);
 
-	if (dev_priv->pm.irqs_disabled)
+	if (!intel_irqs_enabled(dev_priv))
 		return;
 
 	if ((dev_priv->irq_mask & mask) != mask) {
@@ -173,7 +173,7 @@ static void ilk_update_gt_irq(struct drm_i915_private *dev_priv,
 {
 	assert_spin_locked(&dev_priv->irq_lock);
 
-	if (WARN_ON(dev_priv->pm.irqs_disabled))
+	if (WARN_ON(!intel_irqs_enabled(dev_priv)))
 		return;
 
 	dev_priv->gt_irq_mask &= ~interrupt_mask;
@@ -206,7 +206,7 @@ static void snb_update_pm_irq(struct drm_i915_private *dev_priv,
 
 	assert_spin_locked(&dev_priv->irq_lock);
 
-	if (WARN_ON(dev_priv->pm.irqs_disabled))
+	if (WARN_ON(!intel_irqs_enabled(dev_priv)))
 		return;
 
 	new_val = dev_priv->pm_irq_mask;
@@ -264,7 +264,7 @@ static void bdw_update_pm_irq(struct drm_i915_private *dev_priv,
 
 	assert_spin_locked(&dev_priv->irq_lock);
 
-	if (WARN_ON(dev_priv->pm.irqs_disabled))
+	if (WARN_ON(!intel_irqs_enabled(dev_priv)))
 		return;
 
 	new_val = dev_priv->pm_irq_mask;
@@ -420,7 +420,7 @@ static void ibx_display_interrupt_update(struct drm_i915_private *dev_priv,
 
 	assert_spin_locked(&dev_priv->irq_lock);
 
-	if (WARN_ON(dev_priv->pm.irqs_disabled))
+	if (WARN_ON(!intel_irqs_enabled(dev_priv)))
 		return;
 
 	I915_WRITE(SDEIMR, sdeimr);
@@ -4774,15 +4774,15 @@ void intel_runtime_pm_disable_interrupts(struct drm_device *dev)
 	struct drm_i915_private *dev_priv = dev->dev_private;
 
 	dev->driver->irq_uninstall(dev);
-	dev_priv->pm.irqs_disabled = true;
+	dev_priv->pm._irqs_disabled = true;
 }
 
 /* Restore interrupts so we can recover from runtime PM. */
 void intel_runtime_pm_restore_interrupts(struct drm_device *dev)
 {
 	struct drm_i915_private *dev_priv = dev->dev_private;
 
-	dev_priv->pm.irqs_disabled = false;
+	dev_priv->pm._irqs_disabled = false;
 	dev->driver->irq_preinstall(dev);
 	dev->driver->irq_postinstall(dev);
 }

drivers/gpu/drm/i915/intel_display.c

@@ -7341,7 +7341,7 @@ static void assert_can_disable_lcpll(struct drm_i915_private *dev_priv)
 	 * gen-specific and since we only disable LCPLL after we fully disable
 	 * the interrupts, the check below should be enough.
 	 */
-	WARN(!dev_priv->pm.irqs_disabled, "IRQs enabled\n");
+	WARN(intel_irqs_enabled(dev_priv), "IRQs enabled\n");
 }
 
 static uint32_t hsw_read_dcomp(struct drm_i915_private *dev_priv)

drivers/gpu/drm/i915/intel_drv.h

@@ -691,11 +691,19 @@ void gen8_enable_pm_irq(struct drm_i915_private *dev_priv, uint32_t mask);
 void gen8_disable_pm_irq(struct drm_i915_private *dev_priv, uint32_t mask);
 void intel_runtime_pm_disable_interrupts(struct drm_device *dev);
 void intel_runtime_pm_restore_interrupts(struct drm_device *dev);
+static inline bool intel_irqs_enabled(struct drm_i915_private *dev_priv)
+{
+	/*
+	 * We only use drm_irq_uninstall() at unload and VT switch, so
+	 * this is the only thing we need to check.
+	 */
+	return !dev_priv->pm._irqs_disabled;
+}
+
 int intel_get_crtc_scanline(struct intel_crtc *crtc);
 void i9xx_check_fifo_underruns(struct drm_device *dev);
 void gen8_irq_power_well_post_enable(struct drm_i915_private *dev_priv);
 
-
 /* intel_crt.c */
 void intel_crt_init(struct drm_device *dev);
 

drivers/gpu/drm/i915/intel_pm.c

@@ -4976,7 +4976,7 @@ void intel_suspend_gt_powersave(struct drm_device *dev)
 	struct drm_i915_private *dev_priv = dev->dev_private;
 
 	/* Interrupts should be disabled already to avoid re-arming. */
-	WARN_ON(dev->irq_enabled && !dev_priv->pm.irqs_disabled);
+	WARN_ON(intel_irqs_enabled(dev_priv));
 
 	flush_delayed_work(&dev_priv->rps.delayed_resume_work);
 
@@ -4991,7 +4991,7 @@ void intel_disable_gt_powersave(struct drm_device *dev)
 	struct drm_i915_private *dev_priv = dev->dev_private;
 
 	/* Interrupts should be disabled already to avoid re-arming. */
-	WARN_ON(dev->irq_enabled && !dev_priv->pm.irqs_disabled);
+	WARN_ON(intel_irqs_enabled(dev_priv));
 
 	if (IS_IRONLAKE_M(dev)) {
 		ironlake_disable_drps(dev);
@@ -7069,5 +7069,5 @@ void intel_pm_setup(struct drm_device *dev)
 			  intel_gen6_powersave_work);
 
 	dev_priv->pm.suspended = false;
-	dev_priv->pm.irqs_disabled = false;
+	dev_priv->pm._irqs_disabled = false;
 }