drm/i915: rip out ring->irq_mask

We only ever enable/disable one interrupt (namely user_interrupts and
pipe_notify), so we don't need to track the interrupt masking state.

Also rename irq_enable to irq_enable_mask, now that it won't collide -
beforehand both a irq_mask and irq_enable_mask would have looked a bit
strange.
Reviewed-by: NEric Anholt <eric@anholt.net>
Signed-Off-by: NDaniel Vetter <daniel.vetter@ffwll.ch>

drivers/gpu/drm/i915/intel_ringbuffer.c

@@ -798,7 +798,6 @@ gen6_ring_get_irq(struct intel_ring_buffer *ring)
 {
 	struct drm_device *dev = ring->dev;
 	drm_i915_private_t *dev_priv = dev->dev_private;
-	u32 mask = ring->irq_enable;
 
 	if (!dev->irq_enabled)
 	       return false;
@@ -810,9 +809,8 @@ gen6_ring_get_irq(struct intel_ring_buffer *ring)
 
 	spin_lock(&ring->irq_lock);
 	if (ring->irq_refcount++ == 0) {
-		ring->irq_mask &= ~mask;
-		I915_WRITE_IMR(ring, ring->irq_mask);
-		ironlake_enable_irq(dev_priv, mask);
+		I915_WRITE_IMR(ring, ~ring->irq_enable_mask);
+		ironlake_enable_irq(dev_priv, ring->irq_enable_mask);
 	}
 	spin_unlock(&ring->irq_lock);
 
@@ -824,13 +822,11 @@ gen6_ring_put_irq(struct intel_ring_buffer *ring)
 {
 	struct drm_device *dev = ring->dev;
 	drm_i915_private_t *dev_priv = dev->dev_private;
-	u32 mask = ring->irq_enable;
 
 	spin_lock(&ring->irq_lock);
 	if (--ring->irq_refcount == 0) {
-		ring->irq_mask |= mask;
-		I915_WRITE_IMR(ring, ring->irq_mask);
-		ironlake_disable_irq(dev_priv, mask);
+		I915_WRITE_IMR(ring, ~0);
+		ironlake_disable_irq(dev_priv, ring->irq_enable_mask);
 	}
 	spin_unlock(&ring->irq_lock);
 
@@ -1002,7 +998,6 @@ int intel_init_ring_buffer(struct drm_device *dev,
 
 	init_waitqueue_head(&ring->irq_queue);
 	spin_lock_init(&ring->irq_lock);
-	ring->irq_mask = ~0;
 
 	if (I915_NEED_GFX_HWS(dev)) {
 		ret = init_status_page(ring);
@@ -1380,7 +1375,7 @@ static const struct intel_ring_buffer gen6_bsd_ring = {
 	.flush			= gen6_ring_flush,
 	.add_request		= gen6_add_request,
 	.get_seqno		= gen6_ring_get_seqno,
-	.irq_enable		= GEN6_BSD_USER_INTERRUPT,
+	.irq_enable_mask	= GEN6_BSD_USER_INTERRUPT,
 	.irq_get		= gen6_ring_get_irq,
 	.irq_put		= gen6_ring_put_irq,
 	.dispatch_execbuffer	= gen6_ring_dispatch_execbuffer,
@@ -1426,7 +1421,7 @@ static const struct intel_ring_buffer gen6_blt_ring = {
 	.get_seqno		= gen6_ring_get_seqno,
 	.irq_get		= gen6_ring_get_irq,
 	.irq_put		= gen6_ring_put_irq,
-	.irq_enable		= GEN6_BLITTER_USER_INTERRUPT,
+	.irq_enable_mask	= GEN6_BLITTER_USER_INTERRUPT,
 	.dispatch_execbuffer	= gen6_ring_dispatch_execbuffer,
 	.sync_to		= gen6_blt_ring_sync_to,
 	.semaphore_register	= {MI_SEMAPHORE_SYNC_BR,
@@ -1446,7 +1441,7 @@ int intel_init_render_ring_buffer(struct drm_device *dev)
 		ring->flush = gen6_render_ring_flush;
 		ring->irq_get = gen6_ring_get_irq;
 		ring->irq_put = gen6_ring_put_irq;
-		ring->irq_enable = GT_USER_INTERRUPT;
+		ring->irq_enable_mask = GT_USER_INTERRUPT;
 		ring->get_seqno = gen6_ring_get_seqno;
 	} else if (IS_GEN5(dev)) {
 		ring->add_request = pc_render_add_request;
@@ -1471,7 +1466,7 @@ int intel_render_ring_init_dri(struct drm_device *dev, u64 start, u32 size)
 		ring->add_request = gen6_add_request;
 		ring->irq_get = gen6_ring_get_irq;
 		ring->irq_put = gen6_ring_put_irq;
-		ring->irq_enable = GT_USER_INTERRUPT;
+		ring->irq_enable_mask = GT_USER_INTERRUPT;
 	} else if (IS_GEN5(dev)) {
 		ring->add_request = pc_render_add_request;
 		ring->get_seqno = pc_render_get_seqno;

drivers/gpu/drm/i915/intel_ringbuffer.h

@@ -58,8 +58,7 @@ struct  intel_ring_buffer {
 
 	spinlock_t	irq_lock;
 	u32		irq_refcount;
-	u32		irq_mask;
-	u32		irq_enable;		/* IRQs enabled for this ring */
+	u32		irq_enable_mask;	/* bitmask to enable ring interrupt */
 	u32		irq_seqno;		/* last seq seem at irq time */
 	u32		trace_irq_seqno;
 	u32		waiting_seqno;