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authorChris Wilson <chris@chris-wilson.co.uk>2011-01-04 22:22:56 +0000
committerChris Wilson <chris@chris-wilson.co.uk>2011-01-11 20:43:57 +0000
commit01a03331e5fe91861937f8b8e72c259f5e9eae67 (patch)
tree04907482e03da7bafae301778104a13610a38076 /drivers
parent9862e600cef87de0e301bad7d1435b87e03ea84d (diff)
drm/i915/ringbuffer: Simplify the ring irq refcounting
... and move it under the spinlock to gain the appropriate memory barriers. Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=32752 Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Diffstat (limited to 'drivers')
-rw-r--r--drivers/gpu/drm/i915/intel_ringbuffer.c62
-rw-r--r--drivers/gpu/drm/i915/intel_ringbuffer.h2
2 files changed, 25 insertions, 39 deletions
diff --git a/drivers/gpu/drm/i915/intel_ringbuffer.c b/drivers/gpu/drm/i915/intel_ringbuffer.c
index 3bff7fb72341..13cad981713b 100644
--- a/drivers/gpu/drm/i915/intel_ringbuffer.c
+++ b/drivers/gpu/drm/i915/intel_ringbuffer.c
@@ -521,22 +521,20 @@ static bool
render_ring_get_irq(struct intel_ring_buffer *ring)
{
struct drm_device *dev = ring->dev;
+ drm_i915_private_t *dev_priv = dev->dev_private;
if (!dev->irq_enabled)
return false;
- if (atomic_inc_return(&ring->irq_refcount) == 1) {
- drm_i915_private_t *dev_priv = dev->dev_private;
- unsigned long irqflags;
-
- spin_lock_irqsave(&dev_priv->irq_lock, irqflags);
+ spin_lock(&dev_priv->irq_lock);
+ if (ring->irq_refcount++ == 0) {
if (HAS_PCH_SPLIT(dev))
ironlake_enable_irq(dev_priv,
GT_PIPE_NOTIFY | GT_USER_INTERRUPT);
else
i915_enable_irq(dev_priv, I915_USER_INTERRUPT);
- spin_unlock_irqrestore(&dev_priv->irq_lock, irqflags);
}
+ spin_unlock(&dev_priv->irq_lock);
return true;
}
@@ -545,20 +543,18 @@ static void
render_ring_put_irq(struct intel_ring_buffer *ring)
{
struct drm_device *dev = ring->dev;
+ drm_i915_private_t *dev_priv = dev->dev_private;
- if (atomic_dec_and_test(&ring->irq_refcount)) {
- drm_i915_private_t *dev_priv = dev->dev_private;
- unsigned long irqflags;
-
- spin_lock_irqsave(&dev_priv->irq_lock, irqflags);
+ spin_lock(&dev_priv->irq_lock);
+ if (--ring->irq_refcount == 0) {
if (HAS_PCH_SPLIT(dev))
ironlake_disable_irq(dev_priv,
GT_USER_INTERRUPT |
GT_PIPE_NOTIFY);
else
i915_disable_irq(dev_priv, I915_USER_INTERRUPT);
- spin_unlock_irqrestore(&dev_priv->irq_lock, irqflags);
}
+ spin_unlock(&dev_priv->irq_lock);
}
void intel_ring_setup_status_page(struct intel_ring_buffer *ring)
@@ -619,18 +615,15 @@ static bool
ring_get_irq(struct intel_ring_buffer *ring, u32 flag)
{
struct drm_device *dev = ring->dev;
+ drm_i915_private_t *dev_priv = dev->dev_private;
if (!dev->irq_enabled)
return false;
- if (atomic_inc_return(&ring->irq_refcount) == 1) {
- drm_i915_private_t *dev_priv = dev->dev_private;
- unsigned long irqflags;
-
- spin_lock_irqsave(&dev_priv->irq_lock, irqflags);
+ spin_lock(&dev_priv->irq_lock);
+ if (ring->irq_refcount++ == 0)
ironlake_enable_irq(dev_priv, flag);
- spin_unlock_irqrestore(&dev_priv->irq_lock, irqflags);
- }
+ spin_unlock(&dev_priv->irq_lock);
return true;
}
@@ -639,35 +632,30 @@ static void
ring_put_irq(struct intel_ring_buffer *ring, u32 flag)
{
struct drm_device *dev = ring->dev;
+ drm_i915_private_t *dev_priv = dev->dev_private;
- if (atomic_dec_and_test(&ring->irq_refcount)) {
- drm_i915_private_t *dev_priv = dev->dev_private;
- unsigned long irqflags;
-
- spin_lock_irqsave(&dev_priv->irq_lock, irqflags);
+ spin_lock(&dev_priv->irq_lock);
+ if (--ring->irq_refcount == 0)
ironlake_disable_irq(dev_priv, flag);
- spin_unlock_irqrestore(&dev_priv->irq_lock, irqflags);
- }
+ spin_unlock(&dev_priv->irq_lock);
}
static bool
gen6_ring_get_irq(struct intel_ring_buffer *ring, u32 gflag, u32 rflag)
{
struct drm_device *dev = ring->dev;
+ drm_i915_private_t *dev_priv = dev->dev_private;
if (!dev->irq_enabled)
return false;
- if (atomic_inc_return(&ring->irq_refcount) == 1) {
- drm_i915_private_t *dev_priv = dev->dev_private;
- unsigned long irqflags;
-
- spin_lock_irqsave(&dev_priv->irq_lock, irqflags);
+ spin_lock(&dev_priv->irq_lock);
+ if (ring->irq_refcount++ == 0) {
ring->irq_mask &= ~rflag;
I915_WRITE_IMR(ring, ring->irq_mask);
ironlake_enable_irq(dev_priv, gflag);
- spin_unlock_irqrestore(&dev_priv->irq_lock, irqflags);
}
+ spin_unlock(&dev_priv->irq_lock);
return true;
}
@@ -676,17 +664,15 @@ static void
gen6_ring_put_irq(struct intel_ring_buffer *ring, u32 gflag, u32 rflag)
{
struct drm_device *dev = ring->dev;
+ drm_i915_private_t *dev_priv = dev->dev_private;
- if (atomic_dec_and_test(&ring->irq_refcount)) {
- drm_i915_private_t *dev_priv = dev->dev_private;
- unsigned long irqflags;
-
- spin_lock_irqsave(&dev_priv->irq_lock, irqflags);
+ spin_lock(&dev_priv->irq_lock);
+ if (--ring->irq_refcount == 0) {
ring->irq_mask |= rflag;
I915_WRITE_IMR(ring, ring->irq_mask);
ironlake_disable_irq(dev_priv, gflag);
- spin_unlock_irqrestore(&dev_priv->irq_lock, irqflags);
}
+ spin_unlock(&dev_priv->irq_lock);
}
static bool
diff --git a/drivers/gpu/drm/i915/intel_ringbuffer.h b/drivers/gpu/drm/i915/intel_ringbuffer.h
index 9b134b8643cb..6b1d9a5a7d07 100644
--- a/drivers/gpu/drm/i915/intel_ringbuffer.h
+++ b/drivers/gpu/drm/i915/intel_ringbuffer.h
@@ -55,11 +55,11 @@ struct intel_ring_buffer {
int effective_size;
struct intel_hw_status_page status_page;
+ u32 irq_refcount;
u32 irq_mask;
u32 irq_seqno; /* last seq seem at irq time */
u32 waiting_seqno;
u32 sync_seqno[I915_NUM_RINGS-1];
- atomic_t irq_refcount;
bool __must_check (*irq_get)(struct intel_ring_buffer *ring);
void (*irq_put)(struct intel_ring_buffer *ring);