[PATCH 19/20] drm/i915/icl: Handle RPS interrupts correctly for Gen11

[Mika Kuoppala <mika.kuoppala@linux.intel.com>]

From: Oscar Mateo <oscar.mateo@intel.com>

Using the new hierarchical interrupt infrastructure.

Cc: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Cc: Daniele Ceraolo Spurio <daniele.ceraolospurio@intel.com>
Cc: Sagar Arun Kamble <sagar.a.kamble@intel.com>
Cc: Paulo Zanoni <paulo.r.zanoni@intel.com>
Signed-off-by: Oscar Mateo <oscar.mateo@intel.com>
---
 drivers/gpu/drm/i915/i915_irq.c  | 68 +++++++++++++++++++++++++++++++++-------
 drivers/gpu/drm/i915/intel_drv.h |  1 +
 drivers/gpu/drm/i915/intel_pm.c  |  6 ++--
 3 files changed, 60 insertions(+), 15 deletions(-)

diff --git a/drivers/gpu/drm/i915/i915_irq.c b/drivers/gpu/drm/i915/i915_irq.c
index 0318c560c74b..cd7b0bf5bd78 100644
--- a/drivers/gpu/drm/i915/i915_irq.c
+++ b/drivers/gpu/drm/i915/i915_irq.c
@@ -339,17 +339,29 @@ void gen5_disable_gt_irq(struct drm_i915_private *dev_priv, uint32_t mask)
 
 static i915_reg_t gen6_pm_iir(struct drm_i915_private *dev_priv)
 {
+	WARN_ON_ONCE(INTEL_GEN(dev_priv) >= 11);
+
 	return INTEL_GEN(dev_priv) >= 8 ? GEN8_GT_IIR(2) : GEN6_PMIIR;
 }
 
 static i915_reg_t gen6_pm_imr(struct drm_i915_private *dev_priv)
 {
-	return INTEL_GEN(dev_priv) >= 8 ? GEN8_GT_IMR(2) : GEN6_PMIMR;
+	if (INTEL_GEN(dev_priv) >= 11)
+		return GEN11_GPM_WGBOXPERF_INTR_MASK;
+	else if (INTEL_GEN(dev_priv) >= 8)
+		return GEN8_GT_IMR(2);
+	else
+		return GEN6_PMIMR;
 }
 
 static i915_reg_t gen6_pm_ier(struct drm_i915_private *dev_priv)
 {
-	return INTEL_GEN(dev_priv) >= 8 ? GEN8_GT_IER(2) : GEN6_PMIER;
+	if (INTEL_GEN(dev_priv) >= 11)
+		return GEN11_GPM_WGBOXPERF_INTR_ENABLE;
+	else if (INTEL_GEN(dev_priv) >= 8)
+		return GEN8_GT_IER(2);
+	else
+		return GEN6_PMIER;
 }
 
 /**
@@ -431,6 +443,28 @@ static void gen6_disable_pm_irq(struct drm_i915_private *dev_priv, u32 disable_m
 	/* though a barrier is missing here, but don't really need a one */
 }
 
+void gen11_reset_rps_interrupts(struct drm_i915_private *dev_priv)
+{
+	u32 dw;
+
+	spin_lock_irq(&dev_priv->irq_lock);
+
+	/*
+	 * According to the BSpec, DW_IIR bits cannot be cleared without
+	 * first servicing the Selector & Shared IIR registers.
+	 */
+	dw = I915_READ_FW(GEN11_GT_INTR_DW0);
+	while (dw & BIT(GEN11_GTPM)) {
+		gen11_service_shared_iir(dev_priv, 0, GEN11_GTPM);
+		I915_WRITE_FW(GEN11_GT_INTR_DW0, BIT(GEN11_GTPM));
+		dw = I915_READ_FW(GEN11_GT_INTR_DW0);
+	}
+
+	dev_priv->gt_pm.rps.pm_iir = 0;
+
+	spin_unlock_irq(&dev_priv->irq_lock);
+}
+
 void gen6_reset_rps_interrupts(struct drm_i915_private *dev_priv)
 {
 	spin_lock_irq(&dev_priv->irq_lock);
@@ -446,12 +480,12 @@ void gen6_enable_rps_interrupts(struct drm_i915_private *dev_priv)
 	if (READ_ONCE(rps->interrupts_enabled))
 		return;
 
-	if (WARN_ON_ONCE(IS_GEN11(dev_priv)))
-		return;
-
 	spin_lock_irq(&dev_priv->irq_lock);
 	WARN_ON_ONCE(rps->pm_iir);
-	WARN_ON_ONCE(I915_READ(gen6_pm_iir(dev_priv)) & dev_priv->pm_rps_events);
+	if (INTEL_GEN(dev_priv) >= 11)
+		WARN_ON_ONCE(I915_READ_FW(GEN11_GT_INTR_DW0) & BIT(GEN11_GTPM));
+	else
+		WARN_ON_ONCE(I915_READ(gen6_pm_iir(dev_priv)) & dev_priv->pm_rps_events);
 	rps->interrupts_enabled = true;
 	gen6_enable_pm_irq(dev_priv, dev_priv->pm_rps_events);
 
@@ -465,9 +499,6 @@ void gen6_disable_rps_interrupts(struct drm_i915_private *dev_priv)
 	if (!READ_ONCE(rps->interrupts_enabled))
 		return;
 
-	if (WARN_ON_ONCE(IS_GEN11(dev_priv)))
-		return;
-
 	spin_lock_irq(&dev_priv->irq_lock);
 	rps->interrupts_enabled = false;
 
@@ -484,7 +515,10 @@ void gen6_disable_rps_interrupts(struct drm_i915_private *dev_priv)
 	 * state of the worker can be discarded.
 	 */
 	cancel_work_sync(&rps->work);
-	gen6_reset_rps_interrupts(dev_priv);
+	if (INTEL_GEN(dev_priv) >= 11)
+		gen11_reset_rps_interrupts(dev_priv);
+	else
+		gen6_reset_rps_interrupts(dev_priv);
 }
 
 void gen9_reset_guc_interrupts(struct drm_i915_private *dev_priv)
@@ -2842,8 +2876,8 @@ gen11_gt_irq_handler(struct drm_i915_private *dev_priv, u32 master_ctl)
 	}
 
 	if (irq[0][GEN11_GTPM] & dev_priv->pm_rps_events) {
+		gen6_rps_irq_handler(dev_priv, (u32)irq[0][GEN11_GTPM]);
 		ret = IRQ_HANDLED;
-		gen6_rps_irq_handler(dev_priv, tmp);
 	}
 
 	return ret;
@@ -3314,6 +3348,9 @@ static void gen11_gt_irq_reset(struct drm_i915_private *dev_priv)
 	I915_WRITE(GEN11_VCS0_VCS1_INTR_MASK,	~0);
 	I915_WRITE(GEN11_VCS2_VCS3_INTR_MASK,	~0);
 	I915_WRITE(GEN11_VECS0_VECS1_INTR_MASK,	~0);
+
+	I915_WRITE(GEN11_GPM_WGBOXPERF_INTR_ENABLE, 0);
+	I915_WRITE(GEN11_GPM_WGBOXPERF_INTR_MASK,  ~0);
 }
 
 static void gen11_irq_reset(struct drm_device *dev)
@@ -3852,7 +3889,14 @@ static void gen11_gt_irq_postinstall(struct drm_i915_private *dev_priv)
 	I915_WRITE(GEN11_VCS2_VCS3_INTR_MASK,	~(irqs | irqs << 16));
 	I915_WRITE(GEN11_VECS0_VECS1_INTR_MASK,	~(irqs | irqs << 16));
 
-	dev_priv->pm_imr = 0xffffffff; /* TODO */
+	/*
+	 * RPS interrupts will get enabled/disabled on demand when RPS itself
+	 * is enabled/disabled.
+	 */
+	dev_priv->pm_ier = 0x0;
+	dev_priv->pm_imr = ~dev_priv->pm_ier;
+	I915_WRITE(GEN11_GPM_WGBOXPERF_INTR_ENABLE, 0);
+	I915_WRITE(GEN11_GPM_WGBOXPERF_INTR_MASK,  ~0);
 }
 
 static int gen11_irq_postinstall(struct drm_device *dev)
diff --git a/drivers/gpu/drm/i915/intel_drv.h b/drivers/gpu/drm/i915/intel_drv.h
index 898064e8bea7..cafed39ca986 100644
--- a/drivers/gpu/drm/i915/intel_drv.h
+++ b/drivers/gpu/drm/i915/intel_drv.h
@@ -1318,6 +1318,7 @@ void gen5_enable_gt_irq(struct drm_i915_private *dev_priv, uint32_t mask);
 void gen5_disable_gt_irq(struct drm_i915_private *dev_priv, uint32_t mask);
 void gen6_mask_pm_irq(struct drm_i915_private *dev_priv, u32 mask);
 void gen6_unmask_pm_irq(struct drm_i915_private *dev_priv, u32 mask);
+void gen11_reset_rps_interrupts(struct drm_i915_private *dev_priv);
 void gen6_reset_rps_interrupts(struct drm_i915_private *dev_priv);
 void gen6_enable_rps_interrupts(struct drm_i915_private *dev_priv);
 void gen6_disable_rps_interrupts(struct drm_i915_private *dev_priv);
diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c
index 087f981461e7..9218aeb783fb 100644
--- a/drivers/gpu/drm/i915/intel_pm.c
+++ b/drivers/gpu/drm/i915/intel_pm.c
@@ -8027,10 +8027,10 @@ void intel_sanitize_gt_powersave(struct drm_i915_private *dev_priv)
 	dev_priv->gt_pm.rc6.enabled = true; /* force RC6 disabling */
 	intel_disable_gt_powersave(dev_priv);
 
-	if (INTEL_GEN(dev_priv) < 11)
-		gen6_reset_rps_interrupts(dev_priv);
+	if (INTEL_GEN(dev_priv) >= 11)
+		gen11_reset_rps_interrupts(dev_priv);
 	else
-		WARN_ON_ONCE(1);
+		gen6_reset_rps_interrupts(dev_priv);
 }
 
 static inline void intel_disable_llc_pstate(struct drm_i915_private *i915)
-- 
2.14.1

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