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drm/i915: Record the position of the workarounds in the tail of the request

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Rather than blindly assuming we need to advance the tail for
resubmitting the request via the ELSP, record the position.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Mika Kuoppala <mika.kuoppala@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/20160909131201.16673-3-chris@chris-wilson.co.uk
This commit is contained in:
Chris Wilson 2016-09-09 14:11:43 +01:00
parent ba49b2f823
commit a52abd2fac
2 changed files with 11 additions and 8 deletions
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15
drivers/gpu/drm/i915/i915_gem_request.h
View File

@ -88,20 +88,23 @@ struct drm_i915_gem_request {
*/
u32 previous_seqno;
/** Position in the ringbuffer of the start of the request */
/** Position in the ring of the start of the request */
u32 head;
/**
* Position in the ringbuffer of the start of the postfix.
* This is required to calculate the maximum available ringbuffer
* space without overwriting the postfix.
* Position in the ring of the start of the postfix.
* This is required to calculate the maximum available ring space
* without overwriting the postfix.
*/
u32 postfix;
/** Position in the ringbuffer of the end of the whole request */
/** Position in the ring of the end of the whole request */
u32 tail;
/** Preallocate space in the ringbuffer for the emitting the request */
/** Position in the ring of the end of any workarounds after the tail */
u32 wa_tail;
/** Preallocate space in the ring for the emitting the request */
u32 reserved_space;
/**

4
drivers/gpu/drm/i915/intel_lrc.c
View File

@ -482,8 +482,7 @@ static void execlists_unqueue(struct intel_engine_cs *engine)
* resubmit the request. See gen8_emit_request() for where we
* prepare the padding after the end of the request.
*/
req0->tail += 8;
req0->tail &= req0->ring->size - 1;
req0->tail = req0->wa_tail;
}
execlists_elsp_submit_contexts(req0, req1);
@ -711,6 +710,7 @@ intel_logical_ring_advance(struct drm_i915_gem_request *request)
intel_ring_emit(ring, MI_NOOP);
intel_ring_emit(ring, MI_NOOP);
intel_ring_advance(ring);
request->wa_tail = ring->tail;
/* We keep the previous context alive until we retire the following
* request. This ensures that any the context object is still pinned