[Intel-gfx] [PATCH] drm/i915: fix user irq miss in BSD ring on g4x

[Feng, Boqun]

On g4x, user interrupt in BSD ring is missed.
g4x and ironlake share the same bsd_ring, but their interrupt control
interfaces are different. On g4x i915_enable_irq and i915_disable_irq
are used to enable/disable irq,and user interrupt flag in BSD ring on
g4x is I915_BSD_USER_INTERRUPT.
The ring_get_irq and ring_put_irq use ironlake style interrupt control
interface. So rather than use them, expand their code and add an if-else
statement about the device version.


Signed-off-by: Feng, Boqun <boqun.feng at intel.com>
Reviewed-by: Xiang, Haihao <haihao.xiang at intel.com>
Cc: stable at kernel.org
---
 drivers/gpu/drm/i915/intel_ringbuffer.c |   29 +++++++++++++++++++++++++++--
 1 files changed, 27 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/i915/intel_ringbuffer.c b/drivers/gpu/drm/i915/intel_ringbuffer.c
index e9e6f71..c4504a2 100644
--- a/drivers/gpu/drm/i915/intel_ringbuffer.c
+++ b/drivers/gpu/drm/i915/intel_ringbuffer.c
@@ -666,12 +666,37 @@ gen6_ring_put_irq(struct intel_ring_buffer *ring, u32 gflag, u32 rflag)
 static bool
 bsd_ring_get_irq(struct intel_ring_buffer *ring)
 {
-	return ring_get_irq(ring, GT_BSD_USER_INTERRUPT);
+	struct drm_device *dev = ring->dev;
+	drm_i915_private_t *dev_priv = dev->dev_private;
+
+	if (!dev->irq_enabled)
+		return false;
+
+	spin_lock(&ring->irq_lock);
+	if (ring->irq_refcount++ == 0) {
+		if (IS_G4X(dev))
+			i915_enable_irq(dev_priv, I915_BSD_USER_INTERRUPT);
+		else
+			ironlake_enable_irq(dev_priv, GT_BSD_USER_INTERRUPT);
+	}
+	spin_unlock(&ring->irq_lock);
+
+	return true;
 }
 static void
 bsd_ring_put_irq(struct intel_ring_buffer *ring)
 {
-	ring_put_irq(ring, GT_BSD_USER_INTERRUPT);
+	struct drm_device *dev = ring->dev;
+	drm_i915_private_t *dev_priv = dev->dev_private;
+
+	spin_lock(&ring->irq_lock);
+	if (--ring->irq_refcount == 0) {
+		if (IS_G4X(dev))
+			i915_disable_irq(dev_priv, I915_BSD_USER_INTERRUPT);
+		else
+			ironlake_disable_irq(dev_priv, GT_BSD_USER_INTERRUPT);
+	}
+	spin_unlock(&ring->irq_lock);
 }
 
 static int
-- 
1.7.4.4