[Intel-gfx] [RFC PATCH 68/97] drm/i915/guc: Handle context reset notification

[Daniel Vetter]

On Thu, May 06, 2021 at 12:14:22PM -0700, Matthew Brost wrote:
> GuC will issue a reset on detecting an engine hang and will notify
> the driver via a G2H message. The driver will service the notification
> by resetting the guilty context to a simple state or banning it
> completely.
> 
> Cc: Matthew Brost <matthew.brost at intel.com>
> Cc: John Harrison <John.C.Harrison at Intel.com>
> Signed-off-by: Matthew Brost <matthew.brost at intel.com>

Entirely aside, but I wonder whether we shouldn't just make
non-recoverable contexts the only thing we support. But probably a too big
can of worms.
-Daniel

> ---
>  drivers/gpu/drm/i915/gt/uc/intel_guc.h        |  2 ++
>  drivers/gpu/drm/i915/gt/uc/intel_guc_ct.c     |  6 ++++
>  .../gpu/drm/i915/gt/uc/intel_guc_submission.c | 35 +++++++++++++++++++
>  drivers/gpu/drm/i915/i915_trace.h             | 10 ++++++
>  4 files changed, 53 insertions(+)
> 
> diff --git a/drivers/gpu/drm/i915/gt/uc/intel_guc.h b/drivers/gpu/drm/i915/gt/uc/intel_guc.h
> index 277b4496a20e..a2abe1c422e3 100644
> --- a/drivers/gpu/drm/i915/gt/uc/intel_guc.h
> +++ b/drivers/gpu/drm/i915/gt/uc/intel_guc.h
> @@ -263,6 +263,8 @@ int intel_guc_deregister_done_process_msg(struct intel_guc *guc,
>  					  const u32 *msg, u32 len);
>  int intel_guc_sched_done_process_msg(struct intel_guc *guc,
>  				     const u32 *msg, u32 len);
> +int intel_guc_context_reset_process_msg(struct intel_guc *guc,
> +					const u32 *msg, u32 len);
>  
>  void intel_guc_submission_reset_prepare(struct intel_guc *guc);
>  void intel_guc_submission_reset(struct intel_guc *guc, bool stalled);
> diff --git a/drivers/gpu/drm/i915/gt/uc/intel_guc_ct.c b/drivers/gpu/drm/i915/gt/uc/intel_guc_ct.c
> index b3194d753b13..9c84b2ba63a8 100644
> --- a/drivers/gpu/drm/i915/gt/uc/intel_guc_ct.c
> +++ b/drivers/gpu/drm/i915/gt/uc/intel_guc_ct.c
> @@ -941,6 +941,12 @@ static int ct_process_request(struct intel_guc_ct *ct, struct ct_incoming_msg *r
>  			CT_ERROR(ct, "schedule context failed %x %*ph\n",
>  				  action, 4 * len, payload);
>  		break;
> +	case INTEL_GUC_ACTION_CONTEXT_RESET_NOTIFICATION:
> +		ret = intel_guc_context_reset_process_msg(guc, payload, len);
> +		if (unlikely(ret))
> +			CT_ERROR(ct, "context reset notification failed %x %*ph\n",
> +				  action, 4 * len, payload);
> +		break;
>  	default:
>  		ret = -EOPNOTSUPP;
>  		break;
> diff --git a/drivers/gpu/drm/i915/gt/uc/intel_guc_submission.c b/drivers/gpu/drm/i915/gt/uc/intel_guc_submission.c
> index 2c3791fc24b7..940017495731 100644
> --- a/drivers/gpu/drm/i915/gt/uc/intel_guc_submission.c
> +++ b/drivers/gpu/drm/i915/gt/uc/intel_guc_submission.c
> @@ -2192,6 +2192,41 @@ int intel_guc_sched_done_process_msg(struct intel_guc *guc,
>  	return 0;
>  }
>  
> +static void guc_context_replay(struct intel_context *ce)
> +{
> +	struct i915_sched_engine *sched_engine = ce->engine->sched_engine;
> +
> +	__guc_reset_context(ce, true);
> +	i915_sched_engine_hi_kick(sched_engine);
> +}
> +
> +static void guc_handle_context_reset(struct intel_guc *guc,
> +				     struct intel_context *ce)
> +{
> +	trace_intel_context_reset(ce);
> +	guc_context_replay(ce);
> +}
> +
> +int intel_guc_context_reset_process_msg(struct intel_guc *guc,
> +					const u32 *msg, u32 len)
> +{
> +	struct intel_context *ce;
> +	int desc_idx = msg[0];
> +
> +	if (unlikely(len != 1)) {
> +		drm_dbg(&guc_to_gt(guc)->i915->drm, "Invalid length %u", len);
> +		return -EPROTO;
> +	}
> +
> +	ce = g2h_context_lookup(guc, desc_idx);
> +	if (unlikely(!ce))
> +		return -EPROTO;
> +
> +	guc_handle_context_reset(guc, ce);
> +
> +	return 0;
> +}
> +
>  void intel_guc_log_submission_info(struct intel_guc *guc,
>  				   struct drm_printer *p)
>  {
> diff --git a/drivers/gpu/drm/i915/i915_trace.h b/drivers/gpu/drm/i915/i915_trace.h
> index 97c2e83984ed..c095c4d39456 100644
> --- a/drivers/gpu/drm/i915/i915_trace.h
> +++ b/drivers/gpu/drm/i915/i915_trace.h
> @@ -929,6 +929,11 @@ DECLARE_EVENT_CLASS(intel_context,
>  		      __entry->guc_sched_state_no_lock)
>  );
>  
> +DEFINE_EVENT(intel_context, intel_context_reset,
> +	     TP_PROTO(struct intel_context *ce),
> +	     TP_ARGS(ce)
> +);
> +
>  DEFINE_EVENT(intel_context, intel_context_register,
>  	     TP_PROTO(struct intel_context *ce),
>  	     TP_ARGS(ce)
> @@ -1026,6 +1031,11 @@ trace_i915_request_out(struct i915_request *rq)
>  {
>  }
>  
> +static inline void
> +trace_intel_context_reset(struct intel_context *ce)
> +{
> +}
> +
>  static inline void
>  trace_intel_context_register(struct intel_context *ce)
>  {
> -- 
> 2.28.0
> 
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-- 
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch