Chris Wilson <chris@xxxxxxxxxxxxxxxxxx> writes:
> In the future, we will want to unwind requests following a preemption
> point. This requires the same steps as for unwinding upon a reset, so
> extract the existing code to a separate function for later use.
>
> Signed-off-by: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
> ---
> drivers/gpu/drm/i915/intel_lrc.c | 53 +++++++++++++++++++++++++---------------
> 1 file changed, 33 insertions(+), 20 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/intel_lrc.c b/drivers/gpu/drm/i915/intel_lrc.c
> index 2c07f3c08bd3..c84831c7ea4a 100644
> --- a/drivers/gpu/drm/i915/intel_lrc.c
> +++ b/drivers/gpu/drm/i915/intel_lrc.c
> @@ -348,6 +348,37 @@ lookup_priolist(struct intel_engine_cs *engine,
> return ptr_pack_bits(p, first, 1);
> }
>
> +static void unwind_wa_tail(struct drm_i915_gem_request *rq)
> +{
> + rq->tail = intel_ring_wrap(rq->ring,
> + rq->wa_tail - WA_TAIL_DWORDS*sizeof(u32));
> + assert_ring_tail_valid(rq->ring, rq->tail);
> +}
> +
> +static void unwind_incomplete_requests(struct intel_engine_cs *engine)
> +{
> + struct drm_i915_gem_request *rq, *rn;
> +
> + lockdep_assert_held(&engine->timeline->lock);
> + list_for_each_entry_safe_reverse(rq, rn,
> + &engine->timeline->requests,
> + link) {
> + struct i915_priolist *p;
> +
> + if (i915_gem_request_completed(rq))
> + return;
> +
> + __i915_gem_request_unsubmit(rq);
> + unwind_wa_tail(rq);
This here raised my attention. Why do you want
to do this for all requests now?
-Mika
> +
> + p = lookup_priolist(engine,
> + &rq->priotree,
> + rq->priotree.priority);
> + list_add(&rq->priotree.link,
> + &ptr_mask_bits(p, 1)->requests);
> + }
> +}
> +
> static inline void
> execlists_context_status_change(struct drm_i915_gem_request *rq,
> unsigned long status)
> @@ -1378,7 +1409,6 @@ static void reset_common_ring(struct intel_engine_cs *engine,
> struct drm_i915_gem_request *request)
> {
> struct intel_engine_execlists * const execlists = &engine->execlists;
> - struct drm_i915_gem_request *rq, *rn;
> struct intel_context *ce;
> unsigned long flags;
>
> @@ -1396,21 +1426,7 @@ static void reset_common_ring(struct intel_engine_cs *engine,
> execlist_cancel_port_requests(execlists);
>
> /* Push back any incomplete requests for replay after the reset. */
> - list_for_each_entry_safe_reverse(rq, rn,
> - &engine->timeline->requests, link) {
> - struct i915_priolist *p;
> -
> - if (i915_gem_request_completed(rq))
> - break;
> -
> - __i915_gem_request_unsubmit(rq);
> -
> - p = lookup_priolist(engine,
> - &rq->priotree,
> - rq->priotree.priority);
> - list_add(&rq->priotree.link,
> - &ptr_mask_bits(p, 1)->requests);
> - }
> + unwind_incomplete_requests(engine);
>
> spin_unlock_irqrestore(&engine->timeline->lock, flags);
>
> @@ -1447,10 +1463,7 @@ static void reset_common_ring(struct intel_engine_cs *engine,
> intel_ring_update_space(request->ring);
>
> /* Reset WaIdleLiteRestore:bdw,skl as well */
> - request->tail =
> - intel_ring_wrap(request->ring,
> - request->wa_tail - WA_TAIL_DWORDS*sizeof(u32));
> - assert_ring_tail_valid(request->ring, request->tail);
> + unwind_wa_tail(request);
> }
>
> static int intel_logical_ring_emit_pdps(struct drm_i915_gem_request *req)
> --
> 2.14.1
>
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> Intel-gfx@xxxxxxxxxxxxxxxxxxxxx
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