[PATCH v3 1/1] drm/i915: Update GEN6_PMINTRMSK setup with GuC enabled

[Sagar Arun Kamble <sagar.a.kamble@intel.com>]

On Loading, GuC sets PM interrupts routing (bit 31) and clears ARAT
expired interrupt (bit 9). Host turbo also updates this register
in RPS flows. This patch ensures bit 31 and bit 9 setup by GuC persists.
ARAT timer interrupt is needed in GuC for various features. It also
facilitates halting GuC and hence achieving RC6. PM interrupt routing
will not impact RPS interrupt reception by host as GuC will redirect
them.
This patch fixes igt test pm_rc6_residency that was failing with guc
load/submission enabled. Tested with SKL GuC v6.1 and BXT GuC v5.1 and v8.7.

v2: i915_irq/i915_pm decoupling from intel_guc. (ChrisW)

v3: restructuring the mask update and rebase w.r.t Ville's patch. (ChrisW)

Cc: Chris Harris <chris.harris@intel.com>
Cc: Zhe Wang <zhe1.wang@intel.com>
Cc: Deepak S <deepak.s@intel.com>
Cc: Satyanantha, Rama Gopal M <rama.gopal.m.satyanantha@intel.com>
Cc: Akash Goel <akash.goel@intel.com>
Signed-off-by: Sagar Arun Kamble <sagar.a.kamble@intel.com>
---
 drivers/gpu/drm/i915/i915_drv.h         |  2 ++
 drivers/gpu/drm/i915/i915_irq.c         | 36 +++++++++++++++++++++------------
 drivers/gpu/drm/i915/i915_reg.h         |  3 ++-
 drivers/gpu/drm/i915/intel_guc_loader.c |  5 +++++
 4 files changed, 32 insertions(+), 14 deletions(-)

diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index 72f0b02..6a69ed9 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -1132,6 +1132,8 @@ struct intel_gen6_power_mgmt {
 	bool interrupts_enabled;
 	u32 pm_iir;
 
+	u32 pm_intr_keep;
+
 	/* Frequencies are stored in potentially platform dependent multiples.
 	 * In other words, *_freq needs to be multiplied by X to be interesting.
 	 * Soft limits are those which are used for the dynamic reclocking done
diff --git a/drivers/gpu/drm/i915/i915_irq.c b/drivers/gpu/drm/i915/i915_irq.c
index f0d9414..96849f2 100644
--- a/drivers/gpu/drm/i915/i915_irq.c
+++ b/drivers/gpu/drm/i915/i915_irq.c
@@ -364,19 +364,7 @@ void gen6_enable_rps_interrupts(struct drm_i915_private *dev_priv)
 
 u32 gen6_sanitize_rps_pm_mask(struct drm_i915_private *dev_priv, u32 mask)
 {
-	/*
-	 * SNB,IVB can while VLV,CHV may hard hang on looping batchbuffer
-	 * if GEN6_PM_UP_EI_EXPIRED is masked.
-	 *
-	 * TODO: verify if this can be reproduced on VLV,CHV.
-	 */
-	if (INTEL_INFO(dev_priv)->gen <= 7 && !IS_HASWELL(dev_priv))
-		mask &= ~GEN6_PM_RP_UP_EI_EXPIRED;
-
-	if (INTEL_INFO(dev_priv)->gen >= 8)
-		mask &= ~GEN8_PMINTR_REDIRECT_TO_NON_DISP;
-
-	return mask;
+	return (mask & ~dev_priv->rps.pm_intr_keep);
 }
 
 void gen6_disable_rps_interrupts(struct drm_i915_private *dev_priv)
@@ -4580,6 +4568,28 @@ void intel_irq_init(struct drm_i915_private *dev_priv)
 	else
 		dev_priv->pm_rps_events = GEN6_PM_RPS_EVENTS;
 
+	dev_priv->rps.pm_intr_keep = 0;
+
+	/*
+	 * SNB,IVB can while VLV,CHV may hard hang on looping batchbuffer
+	 * if GEN6_PM_UP_EI_EXPIRED is masked.
+	 *
+	 * TODO: verify if this can be reproduced on VLV,CHV.
+	 */
+	if (INTEL_INFO(dev_priv)->gen <= 7 && !IS_HASWELL(dev_priv))
+		dev_priv->rps.pm_intr_keep |= GEN6_PM_RP_UP_EI_EXPIRED;
+
+	/*
+	 * If GuC submission is enabled keep PM interrupts routed to GuC
+	 * and unmask ARAT Expired interrupt as it is needed by GuC.
+	*/
+	if (INTEL_INFO(dev_priv)->gen >= 8) {
+		if (i915.enable_guc_submission)
+			dev_priv->rps.pm_intr_keep |= GEN8_ARAT_EXPIRED_INT_MASK;
+		else
+			dev_priv->rps.pm_intr_keep |= GEN8_PMINTR_REDIRECT_TO_NON_DISP;
+	}
+
 	INIT_DELAYED_WORK(&dev_priv->gpu_error.hangcheck_work,
 			  i915_hangcheck_elapsed);
 
diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
index 86fbf72..98c20d7 100644
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -7030,7 +7030,8 @@ enum skl_disp_power_wells {
 #define VLV_RCEDATA				_MMIO(0xA0BC)
 #define GEN6_RC6pp_THRESHOLD			_MMIO(0xA0C0)
 #define GEN6_PMINTRMSK				_MMIO(0xA168)
-#define GEN8_PMINTR_REDIRECT_TO_NON_DISP	(1<<31)
+#define   GEN8_PMINTR_REDIRECT_TO_NON_DISP	(1<<31)
+#define   GEN8_ARAT_EXPIRED_INT_MASK		(1<<9)
 #define VLV_PWRDWNUPCTL				_MMIO(0xA294)
 #define GEN9_MEDIA_PG_IDLE_HYSTERESIS		_MMIO(0xA0C4)
 #define GEN9_RENDER_PG_IDLE_HYSTERESIS		_MMIO(0xA0C8)
diff --git a/drivers/gpu/drm/i915/intel_guc_loader.c b/drivers/gpu/drm/i915/intel_guc_loader.c
index 23345e1..51a3939 100644
--- a/drivers/gpu/drm/i915/intel_guc_loader.c
+++ b/drivers/gpu/drm/i915/intel_guc_loader.c
@@ -476,6 +476,11 @@ int intel_guc_ucode_load(struct drm_device *dev)
 		/* The execbuf_client will be recreated. Release it first. */
 		i915_guc_submission_disable(dev);
 
+		WARN_ON(!(I915_READ(GEN6_PMINTRMSK) |
+				GEN8_PMINTR_REDIRECT_TO_NON_DISP));
+		WARN_ON(I915_READ(GEN6_PMINTRMSK) |
+				GEN8_ARAT_EXPIRED_INT_MASK);
+
 		err = i915_guc_submission_enable(dev);
 		if (err)
 			goto fail;
-- 
1.9.1

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