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drm/i915/ringbuffer: Make IRQ refcnting atomic

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In order to enforce the correct memory barriers for irq get/put, we need
to perform the actual counting using atomic operations.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
This commit is contained in:
Chris Wilson
2010-12-13 16:54:50 +00:00
parent 8d5203ca62
commit b13c2b96bf
4 changed files with 56 additions and 46 deletions
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4
drivers/gpu/drm/i915/intel_ringbuffer.h
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@@ -54,8 +54,8 @@ struct intel_ring_buffer {
u32 irq_seqno; /* last seq seem at irq time */
u32 waiting_seqno;
u32 sync_seqno[I915_NUM_RINGS-1];
u32 irq_refcount;
void (*irq_get)(struct intel_ring_buffer *ring);
atomic_t irq_refcount;
bool __must_check (*irq_get)(struct intel_ring_buffer *ring);
void (*irq_put)(struct intel_ring_buffer *ring);
int (*init)(struct intel_ring_buffer *ring);