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drm/1915: ringbuffer wait for idle function

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Added a new function which waits for the ringbuffer space to be equal to
(total - 8). This is the empty condition of the ringbuffer, and
equivalent to head==tail.

Also modified two users of this functionality elsewhere in the code.

Signed-off-by: Ben Widawsky <ben@bwidawsk.net>
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
This commit is contained in:
Ben Widawsky 2011-03-19 18:14:27 -07:00 committed by Keith Packard
parent 2c34b850ee
commit 96f298aa9c
3 changed files with 8 additions and 2 deletions
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2
drivers/gpu/drm/i915/i915_dma.c
View File

@ -571,7 +571,7 @@ static int i915_quiescent(struct drm_device *dev)
struct intel_ring_buffer *ring = LP_RING(dev->dev_private);
i915_kernel_lost_context(dev);
return intel_wait_ring_buffer(ring, ring->size - 8);
return intel_wait_ring_idle(ring);
}
static int i915_flush_ioctl(struct drm_device *dev, void *data,

2
drivers/gpu/drm/i915/intel_ringbuffer.c
View File

@ -873,7 +873,7 @@ void intel_cleanup_ring_buffer(struct intel_ring_buffer *ring)
/* Disable the ring buffer. The ring must be idle at this point */
dev_priv = ring->dev->dev_private;
ret = intel_wait_ring_buffer(ring, ring->size - 8);
ret = intel_wait_ring_idle(ring);
if (ret)
DRM_ERROR("failed to quiesce %s whilst cleaning up: %d\n",
ring->name, ret);

6
drivers/gpu/drm/i915/intel_ringbuffer.h
View File

@ -164,7 +164,13 @@ intel_read_status_page(struct intel_ring_buffer *ring,
#define I915_BREADCRUMB_INDEX 0x21
void intel_cleanup_ring_buffer(struct intel_ring_buffer *ring);
int __must_check intel_wait_ring_buffer(struct intel_ring_buffer *ring, int n);
static inline int intel_wait_ring_idle(struct intel_ring_buffer *ring)
{
return intel_wait_ring_buffer(ring, ring->space - 8);
}
int __must_check intel_ring_begin(struct intel_ring_buffer *ring, int n);
static inline void intel_ring_emit(struct intel_ring_buffer *ring,