[Intel-gfx] [PATCH] drm/i915/gt: Expand bad CS completion event debug

[Mika Kuoppala]

Chris Wilson <chris at chris-wilson.co.uk> writes:

> Show the ring/request/context state if we see what we believe is an
> early CS completion.
>
> Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>

Reviewed-by: Mika Kuoppala <mika.kuoppala at linux.intel.com>

> ---
>  drivers/gpu/drm/i915/gt/intel_context.c |  3 ++-
>  drivers/gpu/drm/i915/gt/intel_lrc.c     | 31 +++++++++++++++++++++++--
>  2 files changed, 31 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/gt/intel_context.c b/drivers/gpu/drm/i915/gt/intel_context.c
> index 57e8a051ddc2..e4f89341d17c 100644
> --- a/drivers/gpu/drm/i915/gt/intel_context.c
> +++ b/drivers/gpu/drm/i915/gt/intel_context.c
> @@ -116,7 +116,8 @@ int __intel_context_do_pin(struct intel_context *ce)
>  		if (unlikely(err))
>  			goto err_active;
>  
> -		CE_TRACE(ce, "pin ring:{head:%04x, tail:%04x}\n",
> +		CE_TRACE(ce, "pin ring:{start:%08x, head:%04x, tail:%04x}\n",
> +			 i915_ggtt_offset(ce->ring->vma),
>  			 ce->ring->head, ce->ring->tail);
>  
>  		smp_mb__before_atomic(); /* flush pin before it is visible */
> diff --git a/drivers/gpu/drm/i915/gt/intel_lrc.c b/drivers/gpu/drm/i915/gt/intel_lrc.c
> index 902d440ef07d..1e3db37dea2b 100644
> --- a/drivers/gpu/drm/i915/gt/intel_lrc.c
> +++ b/drivers/gpu/drm/i915/gt/intel_lrc.c
> @@ -2328,8 +2328,35 @@ static void process_csb(struct intel_engine_cs *engine)
>  			 * coherent (visible from the CPU) before the
>  			 * user interrupt and CSB is processed.
>  			 */
> -			GEM_BUG_ON(!i915_request_completed(*execlists->active) &&
> -				   !reset_in_progress(execlists));
> +			if (GEM_SHOW_DEBUG() &&
> +			    !i915_request_completed(*execlists->active) &&
> +			    !reset_in_progress(execlists)) {
> +				struct i915_request *rq = *execlists->active;
> +				const u32 *regs = rq->context->lrc_reg_state;
> +
> +				ENGINE_TRACE(engine,
> +					     "ring:{start:0x%08x, head:%04x, tail:%04x, ctl:%08x, mode:%08x}\n",
> +					     ENGINE_READ(engine, RING_START),
> +					     ENGINE_READ(engine, RING_HEAD) & HEAD_ADDR,
> +					     ENGINE_READ(engine, RING_TAIL) & TAIL_ADDR,
> +					     ENGINE_READ(engine, RING_CTL),
> +					     ENGINE_READ(engine, RING_MI_MODE));
> +				ENGINE_TRACE(engine,
> +					     "rq:{start:%08x, head:%04x, tail:%04x, seqno:%llx:%d, hwsp:%d}, ",
> +					     i915_ggtt_offset(rq->ring->vma),
> +					     rq->head, rq->tail,
> +					     rq->fence.context,
> +					     lower_32_bits(rq->fence.seqno),
> +					     hwsp_seqno(rq));
> +				ENGINE_TRACE(engine,
> +					     "ctx:{start:%08x, head:%04x, tail:%04x}, ",
> +					     regs[CTX_RING_START],
> +					     regs[CTX_RING_HEAD],
> +					     regs[CTX_RING_TAIL]);
> +
> +				GEM_BUG_ON("context completed before request");
> +			}
> +
>  			execlists_schedule_out(*execlists->active++);
>  
>  			GEM_BUG_ON(execlists->active - execlists->inflight >
> -- 
> 2.25.0
>
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