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drm/i915: Recover all available ringbuffer space following reset

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Having flushed all requests from all queues, we know that all
ringbuffers must now be empty. However, since we do not reclaim
all space when retiring the request (to prevent HEADs colliding
with rapid ringbuffer wraparound) the amount of available space
on each ringbuffer upon reset is less than when we start. Do one
more pass over all the ringbuffers to reset the available space

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Mika Kuoppala <mika.kuoppala@intel.com>
Cc: Arun Siluvery <arun.siluvery@linux.intel.com>
Cc: Mika Kuoppala <mika.kuoppala@intel.com>
Cc: Dave Gordon <david.s.gordon@intel.com>
This commit is contained in:
Chris Wilson
2015-09-03 13:01:40 +01:00
committed by Tvrtko Ursulin
parent 01403de3c0
commit 608c1a526c
4 changed files with 27 additions and 3 deletions
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2
drivers/gpu/drm/i915/intel_ringbuffer.h
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@@ -100,6 +100,7 @@ struct intel_ringbuffer {
void __iomem *virtual_start;
struct intel_engine_cs *ring;
struct list_head link;
u32 head;
u32 tail;
@@ -157,6 +158,7 @@ struct intel_engine_cs {
u32 mmio_base;
struct drm_device *dev;
struct intel_ringbuffer *buffer;
struct list_head buffers;
/*
* A pool of objects to use as shadow copies of client batch buffers