[Intel-gfx] [PATCH] drm/i915: Skip pxp init if gt is wedged

[Teres Alexis, Alan Previn]

On Fri, 2023-10-27 at 10:13 +0300, Jani Nikula wrote:
> On Thu, 26 Oct 2023, Zhanjun Dong <zhanjun.dong at intel.com> wrote:
> 
alan:snip
> I'll note that nobody checks intel_pxp_init() return status, so this
> silently skips PXP.
> 
> BR,
> Jani.

alan:snip
> > +	if (intel_gt_is_wedged(gt))
> > +		return -ENODEV;
> > +

alan: wondering if we can add a drm_dbg in the caller of intel_pxp_init and
use a unique return value for the case of gt_is_wedged (for example: -ENXIO.).
As we know gt being wedged at startup basically means all gt usage is dead
and therefore we cant enable PXP (along with everything else that needs submission/
guc/ etc). With a drm-debug in the caller that prints that return value, it
helps us to differentiate between gt-is-wedged vs platform config doesnt support
PXP. However, this would mean new drm-debug 'noise' for platforms that i915 just
doesn't support PXP on at all which would be okay if dont use drm_warn or drm_err
and use 'softer' message like "PXP skipped with %d".

Please treat above comment as a "nit" - i.e. existing patch is good enough for me...
(after addressing Jani's request for more commit message info). ...alan