drm/i915/icl: Handle RPS interrupts correctly for Gen11

Using the new hierarchical interrupt infrastructure.

v2: Rebase
v3: Rebase
v4: use class/instance handler (Mika)

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>
Signed-off-by: Mika Kuoppala <mika.kuoppala@linux.intel.com>
Reviewed-by: Michel Thierry <michel.thierry@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20180405140052.10682-3-mika.kuoppala@linux.intel.com

1 files changed, 62 insertions, 11 deletions

diff --git a/drivers/gpu/drm/i915/i915_irq.c b/drivers/gpu/drm/i915/i915_irq.c
index 45f72a0ece04..36a635475a74 100644
--- a/drivers/gpu/drm/i915/i915_irq.c
+++ b/drivers/gpu/drm/i915/i915_irq.c
@@ -308,17 +308,29 @@ 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;
 }
 
 /**
@@ -400,6 +412,32 @@ 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 */
 }
 
+static u32
+gen11_gt_engine_identity(struct drm_i915_private * const i915,
+                         const unsigned int bank, const unsigned int bit);
+
+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_gt_engine_identity(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);
@@ -415,12 +453,12 @@ 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);
 
@@ -434,9 +472,6 @@ 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;
 
@@ -453,7 +488,10 @@ 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)
@@ -2768,6 +2806,9 @@ static void
 gen11_other_irq_handler(struct drm_i915_private * const i915,
                         const u8 instance, const u16 iir)
 {
+        if (instance == OTHER_GTPM_INSTANCE)
+                return gen6_rps_irq_handler(i915, iir);
+
         WARN_ONCE(1, "unhandled other interrupt instance=0x%x, iir=0x%x\n",
                   instance, iir);
 }
@@ -3330,6 +3371,9 @@ 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)
@@ -3868,7 +3912,14 @@ 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)