Quoting Sagar Arun Kamble (2018-02-01 11:48:54)
>
>
> On 1/31/2018 11:02 PM, Michal Wajdeczko wrote:
> > Since commit 6ca9a2beb5 ("drm/i915: Unwind i915_gem_init() failure")
> > we believed that we correctly handle all errors encountered during
> > GuC initialization, including special one that indicates request to
> > run driver with disabled GPU submission (-EIO).
> >
> > Unfortunately since commit 121981fafe ("drm/i915/guc: Combine
> > enable_guc_loading|submission modparams") we stopped using that
> > error code to avoid unwanted fallback to execlist submission mode.
> >
> > In result any GuC initialization failure was treated as non-recoverable
> > error leading to driver load abort, so we could not even read related
> > GuC error log to investigate cause of the problem.
> >
> > Fix that by always returning -EIO on uC hardware related failure.
> >
> > Signed-off-by: Michal Wajdeczko <[email protected]>
> > Cc: Chris Wilson <[email protected]>
> > Cc: Michal Winiarski <[email protected]>
> > Cc: Daniele Ceraolo Spurio <[email protected]>
> > Cc: Sagar Arun Kamble <[email protected]>
> > ---
> > drivers/gpu/drm/i915/intel_uc.c | 5 +----
> > 1 file changed, 1 insertion(+), 4 deletions(-)
> >
> > diff --git a/drivers/gpu/drm/i915/intel_uc.c
> > b/drivers/gpu/drm/i915/intel_uc.c
> > index 3a13cbb..1547e16 100644
> > --- a/drivers/gpu/drm/i915/intel_uc.c
> > +++ b/drivers/gpu/drm/i915/intel_uc.c
> > @@ -432,11 +432,8 @@ int intel_uc_init_hw(struct drm_i915_private *dev_priv)
> > * Note that there is no fallback as either user explicitly asked for
> > * the GuC or driver default option was to run with the GuC enabled.
> > */
> > - if (GEM_WARN_ON(ret == -EIO))
> > - ret = -EINVAL;
> > -
> > dev_err(dev_priv->drm.dev, "GuC initialization failed %d\n", ret);
> > - return ret;
> > + return -EIO; /* We want to disable GPU submission but keep KMS alive
> > */
> > }
> We'll need to avoid uc_fini_hw/ in unload path since GPU will be marked
> wedged after this?
We should be avoiding uc_fini_hw in unload because we haven't completed
uc_init_hw. Such failure should already be handled?
-Chris
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