drm/i915: Fork DG1 interrupt handler

The current interrupt handler is getting increasingly complicated and
Xe_HP changes will bring even more complexity.  Let's split off a new
interrupt handler starting with DG1 (i.e., when the master tile
interrupt register was added to the design) and use that as the basis
for the new Xe_HP changes.

Now that we track the hardware IP's release number as well as the
version number, we can also properly define DG1 has version "12.10" and
replace the has_master_unit_irq feature flag with an IP version test.

Bspec: 50875
Cc: Daniele Spurio Ceraolo <daniele.ceraolospurio@intel.com>
Cc: Stuart Summers <stuart.summers@intel.com>
Signed-off-by: Paulo Zanoni <paulo.r.zanoni@intel.com>
Signed-off-by: Lucas De Marchi <lucas.demarchi@intel.com>
Signed-off-by: Tomasz Lis <tomasz.lis@intel.com>
Signed-off-by: Matt Roper <matthew.d.roper@intel.com>
Reviewed-by: Matt Atwood <matthew.s.atwood@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20210721223043.834562-5-matthew.d.roper@intel.com

1 files changed, 92 insertions, 47 deletions

diff --git a/drivers/gpu/drm/i915/i915_irq.c b/drivers/gpu/drm/i915/i915_irq.c
index 47b484976919..3e651d4cd512 100644
--- a/drivers/gpu/drm/i915/i915_irq.c
+++ b/drivers/gpu/drm/i915/i915_irq.c
@@ -2698,11 +2698,9 @@ gen11_display_irq_handler(struct drm_i915_private *i915)
 	enable_rpm_wakeref_asserts(&i915->runtime_pm);
 }
 
-static __always_inline irqreturn_t
-__gen11_irq_handler(struct drm_i915_private * const i915,
-		    u32 (*intr_disable)(void __iomem * const regs),
-		    void (*intr_enable)(void __iomem * const regs))
+static irqreturn_t gen11_irq_handler(int irq, void *arg)
 {
+	struct drm_i915_private *i915 = arg;
 	void __iomem * const regs = i915->uncore.regs;
 	struct intel_gt *gt = &i915->gt;
 	u32 master_ctl;
@@ -2711,9 +2709,9 @@ __gen11_irq_handler(struct drm_i915_private * const i915,
 	if (!intel_irqs_enabled(i915))
 		return IRQ_NONE;
 
-	master_ctl = intr_disable(regs);
+	master_ctl = gen11_master_intr_disable(regs);
 	if (!master_ctl) {
-		intr_enable(regs);
+		gen11_master_intr_enable(regs);
 		return IRQ_NONE;
 	}
 
@@ -2726,7 +2724,7 @@ __gen11_irq_handler(struct drm_i915_private * const i915,
 
 	gu_misc_iir = gen11_gu_misc_irq_ack(gt, master_ctl);
 
-	intr_enable(regs);
+	gen11_master_intr_enable(regs);
 
 	gen11_gu_misc_irq_handler(gt, gu_misc_iir);
 
@@ -2735,51 +2733,69 @@ __gen11_irq_handler(struct drm_i915_private * const i915,
 	return IRQ_HANDLED;
 }
 
-static irqreturn_t gen11_irq_handler(int irq, void *arg)
-{
-	return __gen11_irq_handler(arg,
-				   gen11_master_intr_disable,
-				   gen11_master_intr_enable);
-}
-
-static u32 dg1_master_intr_disable_and_ack(void __iomem * const regs)
+static inline u32 dg1_master_intr_disable(void __iomem * const regs)
 {
 	u32 val;
 
 	/* First disable interrupts */
-	raw_reg_write(regs, DG1_MSTR_UNIT_INTR, 0);
+	raw_reg_write(regs, DG1_MSTR_TILE_INTR, 0);
 
 	/* Get the indication levels and ack the master unit */
-	val = raw_reg_read(regs, DG1_MSTR_UNIT_INTR);
+	val = raw_reg_read(regs, DG1_MSTR_TILE_INTR);
 	if (unlikely(!val))
 		return 0;
 
-	raw_reg_write(regs, DG1_MSTR_UNIT_INTR, val);
-
-	/*
-	 * Now with master disabled, get a sample of level indications
-	 * for this interrupt and ack them right away - we keep GEN11_MASTER_IRQ
-	 * out as this bit doesn't exist anymore for DG1
-	 */
-	val = raw_reg_read(regs, GEN11_GFX_MSTR_IRQ) & ~GEN11_MASTER_IRQ;
-	if (unlikely(!val))
-		return 0;
-
-	raw_reg_write(regs, GEN11_GFX_MSTR_IRQ, val);
+	raw_reg_write(regs, DG1_MSTR_TILE_INTR, val);
 
 	return val;
 }
 
 static inline void dg1_master_intr_enable(void __iomem * const regs)
 {
-	raw_reg_write(regs, DG1_MSTR_UNIT_INTR, DG1_MSTR_IRQ);
+	raw_reg_write(regs, DG1_MSTR_TILE_INTR, DG1_MSTR_IRQ);
 }
 
 static irqreturn_t dg1_irq_handler(int irq, void *arg)
 {
-	return __gen11_irq_handler(arg,
-				   dg1_master_intr_disable_and_ack,
-				   dg1_master_intr_enable);
+	struct drm_i915_private * const i915 = arg;
+	struct intel_gt *gt = &i915->gt;
+	void __iomem * const regs = i915->uncore.regs;
+	u32 master_tile_ctl, master_ctl;
+	u32 gu_misc_iir;
+
+	if (!intel_irqs_enabled(i915))
+		return IRQ_NONE;
+
+	master_tile_ctl = dg1_master_intr_disable(regs);
+	if (!master_tile_ctl) {
+		dg1_master_intr_enable(regs);
+		return IRQ_NONE;
+	}
+
+	/* FIXME: we only support tile 0 for now. */
+	if (master_tile_ctl & DG1_MSTR_TILE(0)) {
+		master_ctl = raw_reg_read(regs, GEN11_GFX_MSTR_IRQ);
+		raw_reg_write(regs, GEN11_GFX_MSTR_IRQ, master_ctl);
+	} else {
+		DRM_ERROR("Tile not supported: 0x%08x\n", master_tile_ctl);
+		dg1_master_intr_enable(regs);
+		return IRQ_NONE;
+	}
+
+	gen11_gt_irq_handler(gt, master_ctl);
+
+	if (master_ctl & GEN11_DISPLAY_IRQ)
+		gen11_display_irq_handler(i915);
+
+	gu_misc_iir = gen11_gu_misc_irq_ack(gt, master_ctl);
+
+	dg1_master_intr_enable(regs);
+
+	gen11_gu_misc_irq_handler(gt, gu_misc_iir);
+
+	pmu_irq_stats(i915, IRQ_HANDLED);
+
+	return IRQ_HANDLED;
 }
 
 /* Called from drm generic code, passed 'crtc' which
@@ -3167,10 +3183,20 @@ static void gen11_irq_reset(struct drm_i915_private *dev_priv)
 {
 	struct intel_uncore *uncore = &dev_priv->uncore;
 
-	if (HAS_MASTER_UNIT_IRQ(dev_priv))
-		dg1_master_intr_disable_and_ack(dev_priv->uncore.regs);
-	else
-		gen11_master_intr_disable(dev_priv->uncore.regs);
+	gen11_master_intr_disable(dev_priv->uncore.regs);
+
+	gen11_gt_irq_reset(&dev_priv->gt);
+	gen11_display_irq_reset(dev_priv);
+
+	GEN3_IRQ_RESET(uncore, GEN11_GU_MISC_);
+	GEN3_IRQ_RESET(uncore, GEN8_PCU_);
+}
+
+static void dg1_irq_reset(struct drm_i915_private *dev_priv)
+{
+	struct intel_uncore *uncore = &dev_priv->uncore;
+
+	dg1_master_intr_disable(dev_priv->uncore.regs);
 
 	gen11_gt_irq_reset(&dev_priv->gt);
 	gen11_display_irq_reset(dev_priv);
@@ -3862,13 +3888,28 @@ static void gen11_irq_postinstall(struct drm_i915_private *dev_priv)
 
 	GEN3_IRQ_INIT(uncore, GEN11_GU_MISC_, ~gu_misc_masked, gu_misc_masked);
 
-	if (HAS_MASTER_UNIT_IRQ(dev_priv)) {
-		dg1_master_intr_enable(uncore->regs);
-		intel_uncore_posting_read(&dev_priv->uncore, DG1_MSTR_UNIT_INTR);
-	} else {
-		gen11_master_intr_enable(uncore->regs);
-		intel_uncore_posting_read(&dev_priv->uncore, GEN11_GFX_MSTR_IRQ);
+	gen11_master_intr_enable(uncore->regs);
+	intel_uncore_posting_read(&dev_priv->uncore, GEN11_GFX_MSTR_IRQ);
+}
+
+static void dg1_irq_postinstall(struct drm_i915_private *dev_priv)
+{
+	struct intel_uncore *uncore = &dev_priv->uncore;
+	u32 gu_misc_masked = GEN11_GU_MISC_GSE;
+
+	gen11_gt_irq_postinstall(&dev_priv->gt);
+
+	GEN3_IRQ_INIT(uncore, GEN11_GU_MISC_, ~gu_misc_masked, gu_misc_masked);
+
+	if (HAS_DISPLAY(dev_priv)) {
+		icp_irq_postinstall(dev_priv);
+		gen8_de_irq_postinstall(dev_priv);
+		intel_uncore_write(&dev_priv->uncore, GEN11_DISPLAY_INT_CTL,
+				   GEN11_DISPLAY_IRQ_ENABLE);
 	}
+
+	dg1_master_intr_enable(dev_priv->uncore.regs);
+	intel_uncore_posting_read(&dev_priv->uncore, DG1_MSTR_TILE_INTR);
 }
 
 static void cherryview_irq_postinstall(struct drm_i915_private *dev_priv)
@@ -4407,9 +4448,9 @@ static irq_handler_t intel_irq_handler(struct drm_i915_private *dev_priv)
 		else
 			return i8xx_irq_handler;
 	} else {
-		if (HAS_MASTER_UNIT_IRQ(dev_priv))
+		if (GRAPHICS_VER_FULL(dev_priv) >= IP_VER(12, 10))
 			return dg1_irq_handler;
-		if (GRAPHICS_VER(dev_priv) >= 11)
+		else if (GRAPHICS_VER(dev_priv) >= 11)
 			return gen11_irq_handler;
 		else if (GRAPHICS_VER(dev_priv) >= 8)
 			return gen8_irq_handler;
@@ -4432,7 +4473,9 @@ static void intel_irq_reset(struct drm_i915_private *dev_priv)
 		else
 			i8xx_irq_reset(dev_priv);
 	} else {
-		if (GRAPHICS_VER(dev_priv) >= 11)
+		if (GRAPHICS_VER_FULL(dev_priv) >= IP_VER(12, 10))
+			dg1_irq_reset(dev_priv);
+		else if (GRAPHICS_VER(dev_priv) >= 11)
 			gen11_irq_reset(dev_priv);
 		else if (GRAPHICS_VER(dev_priv) >= 8)
 			gen8_irq_reset(dev_priv);
@@ -4455,7 +4498,9 @@ static void intel_irq_postinstall(struct drm_i915_private *dev_priv)
 		else
 			i8xx_irq_postinstall(dev_priv);
 	} else {
-		if (GRAPHICS_VER(dev_priv) >= 11)
+		if (GRAPHICS_VER_FULL(dev_priv) >= IP_VER(12, 10))
+			dg1_irq_postinstall(dev_priv);
+		else if (GRAPHICS_VER(dev_priv) >= 11)
 			gen11_irq_postinstall(dev_priv);
 		else if (GRAPHICS_VER(dev_priv) >= 8)
 			gen8_irq_postinstall(dev_priv);