[PATCH 24/88] drm/i915: Simplify enabling user-interrupts with L3-remapping

[Chris Wilson]

Borrow the idea from intel_lrc.c to precompute the mask of interrupts we
wish to always enable to avoid having lots of conditionals inside the
interrupt enabling.

Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
---
 drivers/gpu/drm/i915/intel_ringbuffer.c | 35 +++++++++++----------------------
 drivers/gpu/drm/i915/intel_ringbuffer.h |  4 ++--
 2 files changed, 14 insertions(+), 25 deletions(-)

diff --git a/drivers/gpu/drm/i915/intel_ringbuffer.c b/drivers/gpu/drm/i915/intel_ringbuffer.c
index 08d82df2577f..25b72bb0f915 100644
--- a/drivers/gpu/drm/i915/intel_ringbuffer.c
+++ b/drivers/gpu/drm/i915/intel_ringbuffer.c
@@ -1239,8 +1239,7 @@ static int init_render_ring(struct intel_engine_cs *engine)
 	if (INTEL_INFO(engine)->gen >= 6 && INTEL_INFO(engine)->gen < 8)
 		I915_WRITE(INSTPM, _MASKED_BIT_ENABLE(INSTPM_FORCE_ORDERING));
 
-	if (HAS_L3_DPF(engine))
-		I915_WRITE_IMR(engine, ~GT_PARITY_ERROR(engine));
+	I915_WRITE_IMR(engine, ~engine->irq_keep_mask);
 
 	return init_workarounds_ring(engine);
 }
@@ -1612,12 +1611,9 @@ gen6_ring_enable_irq(struct intel_engine_cs *engine)
 {
 	struct drm_i915_private *dev_priv = to_i915(engine);
 
-	if (HAS_L3_DPF(dev_priv) && engine->id == RCS)
-		I915_WRITE_IMR(engine,
-			       ~(engine->irq_enable_mask |
-				 GT_PARITY_ERROR(dev_priv)));
-	else
-		I915_WRITE_IMR(engine, ~engine->irq_enable_mask);
+	I915_WRITE_IMR(engine,
+		       ~(engine->irq_enable_mask |
+			 engine->irq_keep_mask));
 	gen5_enable_gt_irq(dev_priv, engine->irq_enable_mask);
 }
 
@@ -1626,10 +1622,7 @@ gen6_ring_disable_irq(struct intel_engine_cs *engine)
 {
 	struct drm_i915_private *dev_priv = to_i915(engine);
 
-	if (HAS_L3_DPF(dev_priv) && engine->id == RCS)
-		I915_WRITE_IMR(engine, ~GT_PARITY_ERROR(dev_priv));
-	else
-		I915_WRITE_IMR(engine, ~0);
+	I915_WRITE_IMR(engine, ~engine->irq_keep_mask);
 	gen5_disable_gt_irq(dev_priv, engine->irq_enable_mask);
 }
 
@@ -1656,12 +1649,9 @@ gen8_ring_enable_irq(struct intel_engine_cs *engine)
 {
 	struct drm_i915_private *dev_priv = to_i915(engine);
 
-	if (HAS_L3_DPF(dev_priv) && engine->id == RCS)
-		I915_WRITE_IMR(engine,
-			       ~(engine->irq_enable_mask |
-				 GT_RENDER_L3_PARITY_ERROR_INTERRUPT));
-	else
-		I915_WRITE_IMR(engine, ~engine->irq_enable_mask);
+	I915_WRITE_IMR(engine,
+		       ~(engine->irq_enable_mask |
+			 engine->irq_keep_mask));
 	POSTING_READ_FW(RING_IMR(engine->mmio_base));
 }
 
@@ -1670,11 +1660,7 @@ gen8_ring_disable_irq(struct intel_engine_cs *engine)
 {
 	struct drm_i915_private *dev_priv = to_i915(engine);
 
-	if (HAS_L3_DPF(dev_priv) && engine->id == RCS)
-		I915_WRITE_IMR(engine,
-			       ~GT_RENDER_L3_PARITY_ERROR_INTERRUPT);
-	else
-		I915_WRITE_IMR(engine, ~0);
+	I915_WRITE_IMR(engine, ~engine->irq_keep_mask);
 }
 
 static int
@@ -2576,6 +2562,9 @@ int intel_init_render_ring_buffer(struct drm_device *dev)
 	engine->exec_id = I915_EXEC_RENDER;
 	engine->mmio_base = RENDER_RING_BASE;
 
+	if (HAS_L3_DPF(dev_priv))
+		engine->irq_keep_mask = GT_RENDER_L3_PARITY_ERROR_INTERRUPT;
+
 	if (INTEL_INFO(dev)->gen >= 8) {
 		if (i915_semaphore_is_enabled(dev)) {
 			obj = i915_gem_alloc_object(dev, 4096);
diff --git a/drivers/gpu/drm/i915/intel_ringbuffer.h b/drivers/gpu/drm/i915/intel_ringbuffer.h
index 25037a84fc63..a121c31c5735 100644
--- a/drivers/gpu/drm/i915/intel_ringbuffer.h
+++ b/drivers/gpu/drm/i915/intel_ringbuffer.h
@@ -204,7 +204,8 @@ struct  intel_engine_cs {
 	struct i915_ctx_workarounds wa_ctx;
 
 	bool		irq_posted;
-	u32		irq_enable_mask;	/* bitmask to enable ring interrupt */
+	u32             irq_keep_mask; /* bitmask for interrupts that should not be masked */
+	u32		irq_enable_mask;/* bitmask to enable ring interrupt */
 	void		(*irq_enable)(struct intel_engine_cs *ring);
 	void		(*irq_disable)(struct intel_engine_cs *ring);
 
@@ -302,7 +303,6 @@ struct  intel_engine_cs {
 	unsigned int idle_lite_restore_wa;
 	bool disable_lite_restore_wa;
 	u32 ctx_desc_template;
-	u32             irq_keep_mask; /* bitmask for interrupts that should not be masked */
 	int		(*emit_request)(struct drm_i915_gem_request *request);
 	int		(*emit_flush)(struct drm_i915_gem_request *request,
 				      u32 invalidate_domains,
-- 
2.8.0.rc3