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 <ch...@chris-wilson.co.uk>
Reviewed-by: Mika Kuoppala <mika.kuopp...@intel.com>
---
drivers/gpu/drm/i915/i915_gem_request.h | 15 +++++++++------
drivers/gpu/drm/i915/intel_lrc.c | 4 ++--
2 files changed, 11 insertions(+), 8 deletions(-)
diff --git a/drivers/gpu/drm/i915/i915_gem_request.h
b/drivers/gpu/drm/i915/i915_gem_request.h
index 91014de8bfbc..2faa3bb4c39b 100644
--- a/drivers/gpu/drm/i915/i915_gem_request.h
+++ b/drivers/gpu/drm/i915/i915_gem_request.h
@@ -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;
/**
diff --git a/drivers/gpu/drm/i915/intel_lrc.c b/drivers/gpu/drm/i915/intel_lrc.c
index 9bfe304c5256..d7fa9b3a55c3 100644
--- a/drivers/gpu/drm/i915/intel_lrc.c
+++ b/drivers/gpu/drm/i915/intel_lrc.c
@@ -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
--
2.9.3
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