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drm/i915/ringbuffer: Use the HEAD auto-reporting mechanism 

My Sandybridge only reports 0 for the ring buffer registers, causing it
to hang as soon as we exhaust the available ring. As a workaround, take
advantage of our huge ring buffers and use the auto-reporting mechanism
to update the status page with the HEAD location every 64 KiB.

Cherry-picked from 6aa56062ea.

Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=31404
Tested-by: Zhao Jian <jian.j.zhao@intel.com>
Cc: stable@kernel.org
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
hifive-unleashed-5.1
Chris Wilson 2010-11-05 08:56:38 +00:00
parent b47b30ccda
commit 08deebf987
1 changed files with 12 additions and 1 deletions
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13
drivers/gpu/drm/i915/intel_ringbuffer.c
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@ -177,7 +177,7 @@ static int init_ring_common(struct drm_device *dev,
I915_WRITE_CTL(ring,
((ring->gem_object->size - PAGE_SIZE) & RING_NR_PAGES)
| RING_NO_REPORT | RING_VALID);
| RING_REPORT_64K | RING_VALID);
head = I915_READ_HEAD(ring) & HEAD_ADDR;
/* If the head is still not zero, the ring is dead */
@ -692,6 +692,17 @@ int intel_wait_ring_buffer(struct drm_device *dev,
{
unsigned long end;
drm_i915_private_t *dev_priv = dev->dev_private;
u32 head;
head = intel_read_status_page(ring, 4);
if (head) {
ring->head = head & HEAD_ADDR;
ring->space = ring->head - (ring->tail + 8);
if (ring->space < 0)
ring->space += ring->size;
if (ring->space >= n)
return 0;
}
trace_i915_ring_wait_begin (dev);
end = jiffies + 3 * HZ;