[PATCH 2/2] drm/xe/guc: Support crash dump notification from GuC

[Matthew Brost]

On Fri, Nov 08, 2024 at 03:51:12PM -0800, John Harrison wrote:
> On 11/8/2024 15:35, Matthew Brost wrote:
> > On Fri, Nov 08, 2024 at 01:27:37PM -0800, John.C.Harrison at Intel.com wrote:
> > > From: John Harrison <John.C.Harrison at Intel.com>
> > > 
> > > Add support for the two crash dump notifications from GuC. Either one
> > > means GuC is toast, so just capture state trigger a reset.
> > > 
> > > Signed-off-by: John Harrison <John.C.Harrison at Intel.com>
> > > ---
> > >   drivers/gpu/drm/xe/xe_guc_ct.c | 23 +++++++++++++++++++++++
> > >   1 file changed, 23 insertions(+)
> > > 
> > > diff --git a/drivers/gpu/drm/xe/xe_guc_ct.c b/drivers/gpu/drm/xe/xe_guc_ct.c
> > > index 63bd91963eb1..7eb175a0b874 100644
> > > --- a/drivers/gpu/drm/xe/xe_guc_ct.c
> > > +++ b/drivers/gpu/drm/xe/xe_guc_ct.c
> > > @@ -54,6 +54,7 @@ enum {
> > >   	CT_DEAD_PARSE_G2H_UNKNOWN,		/* 0x1000 */
> > >   	CT_DEAD_PARSE_G2H_ORIGIN,		/* 0x2000 */
> > >   	CT_DEAD_PARSE_G2H_TYPE,			/* 0x4000 */
> > > +	CT_DEAD_CRASH,				/* 0x8000 */
> > >   };
> > >   static void ct_dead_worker_func(struct work_struct *w);
> > > @@ -1120,6 +1121,24 @@ static int parse_g2h_event(struct xe_guc_ct *ct, u32 *msg, u32 len)
> > >   	return 0;
> > >   }
> > > +static int guc_crash_process_msg(struct xe_guc_ct *ct, u32 action)
> > > +{
> > > +	struct xe_gt *gt = ct_to_gt(ct);
> > > +
> > > +	if (action == XE_GUC_ACTION_NOTIFY_CRASH_DUMP_POSTED)
> > > +		xe_gt_err(gt, "GuC Crash dump notification\n");
> > > +	else if (action == XE_GUC_ACTION_NOTIFY_EXCEPTION)
> > > +		xe_gt_err(gt, "GuC Exception notification\n");
> > > +	else
> > > +		xe_gt_err(gt, "Unknown GuC crash notification: 0x%04X\n", action);
> > > +
> > > +	CT_DEAD(ct, NULL, CRASH);
> > > +
> > > +	kick_reset(ct);
> > Side note, we may want to wire a devcoredump to a GT reset too.
> I have a work-in-progress series to allow creating a devcoredump without a
> scheduler job. I assume that would be a re-requisite to creating one from an
> arbitrary GT reset. Certainly coming in from an async event such as this,
> there is no scheduler job to use. Hoping to post that soon. Should be easy
> enough to connect it to the GT reset then.
> 

We appear to be stepping on each other feet, just posted this one...

https://patchwork.freedesktop.org/series/141110/

I had to code these locally while working on something else so threw
them on the list.

Let me know if I missed anything there or if you want me to hold up
merging as I was planning on merging once CI is clean.

Also agree it is a small rework (don't assume we have a queue) on top of
this to connect this to a GT reset.

Matt

> John.
> 
> > 
> > Anyways this patch LGTM. With that:
> > Reviewed-by: Matthew Brost <matthew.brost at intel.com>
> > 
> > > +
> > > +	return 0;
> > > +}
> > > +
> > >   static int parse_g2h_response(struct xe_guc_ct *ct, u32 *msg, u32 len)
> > >   {
> > >   	struct xe_gt *gt =  ct_to_gt(ct);
> > > @@ -1294,6 +1313,10 @@ static int process_g2h_msg(struct xe_guc_ct *ct, u32 *msg, u32 len)
> > >   	case GUC_ACTION_GUC2PF_ADVERSE_EVENT:
> > >   		ret = xe_gt_sriov_pf_monitor_process_guc2pf(gt, hxg, hxg_len);
> > >   		break;
> > > +	case XE_GUC_ACTION_NOTIFY_CRASH_DUMP_POSTED:
> > > +	case XE_GUC_ACTION_NOTIFY_EXCEPTION:
> > > +		ret = guc_crash_process_msg(ct, action);
> > > +		break;
> > >   	default:
> > >   		xe_gt_err(gt, "unexpected G2H action 0x%04x\n", action);
> > >   	}
> > > -- 
> > > 2.47.0
> > > 
>