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drm/i915/ringbuffer: Simplify the ring irq refcounting

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... 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>
This commit is contained in:
Chris Wilson 2011-01-04 22:22:56 +00:00
parent 9862e600ce
commit 01a03331e5
2 changed files with 25 additions and 39 deletions
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62
drivers/gpu/drm/i915/intel_ringbuffer.c
View file

@ -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

2
drivers/gpu/drm/i915/intel_ringbuffer.h
View file

@ -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);