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authorChris Wilson <chris@chris-wilson.co.uk>2010-12-09 12:56:37 +0000
committerChris Wilson <chris@chris-wilson.co.uk>2010-12-09 12:53:19 +0000
commit8c0a6bfef165ccdbf5d73afb9dd660107b0c98d5 (patch)
tree09455156e4e46ac5137ddab9ec3aed65bc6a8c59 /drivers/gpu/drm/i915/intel_ringbuffer.h
parent8316f33766a82907c694267ff911e45e256f09f9 (diff)
drm/i915/ringbuffer: Handle wrapping of the autoreported HEAD
If the tail advances beyond the autoreport HEAD value, then we need to fallback to an uncached read of the HEAD register in order to ascertain the correct amount of remaining space in the ringbuffer. Reported-by: Fang, Xun <xunx.fang@intel.com> Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=32259 Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Diffstat (limited to 'drivers/gpu/drm/i915/intel_ringbuffer.h')
-rw-r--r--drivers/gpu/drm/i915/intel_ringbuffer.h5
1 files changed, 3 insertions, 2 deletions
diff --git a/drivers/gpu/drm/i915/intel_ringbuffer.h b/drivers/gpu/drm/i915/intel_ringbuffer.h
index 3126c2681983..d2cd0f1efeed 100644
--- a/drivers/gpu/drm/i915/intel_ringbuffer.h
+++ b/drivers/gpu/drm/i915/intel_ringbuffer.h
@@ -30,8 +30,9 @@ struct intel_ring_buffer {
struct drm_device *dev;
struct drm_gem_object *gem_object;
- unsigned int head;
- unsigned int tail;
+ u32 actual_head;
+ u32 head;
+ u32 tail;
int space;
struct intel_hw_status_page status_page;