Quoting Michel Thierry (2017-12-16 00:02:47)
> Hi,
>
> On 12/15/2017 3:52 PM, Chris Wilson wrote:
> > At the beginning of a reset, we disable the submission method and find
> > the stuck request. We expect to find a stuck request for we have
> > declared the engine stalled. However, if we find no active request, the
> > engine must have recovered from its stall before we could issue a reset,
> > so let the engine continue on without a reset. If the engine is truly
> > stuck, we will back soon enough with the next reset attempt.
> >
> > Signed-off-by: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
> > Cc: Michel Thierry <michel.thierry@xxxxxxxxx>
> > Cc: Mika Kuoppala <mika.kuoppala@xxxxxxxxxxxxxxx>
> > ---
> > drivers/gpu/drm/i915/i915_drv.c | 14 +++++++-------
> > 1 file changed, 7 insertions(+), 7 deletions(-)
> >
> > diff --git a/drivers/gpu/drm/i915/i915_drv.c b/drivers/gpu/drm/i915/i915_drv.c
> > index ca9f4b2862eb..6f24435ddffe 100644
> > --- a/drivers/gpu/drm/i915/i915_drv.c
> > +++ b/drivers/gpu/drm/i915/i915_drv.c
> > @@ -2011,19 +2011,19 @@ int i915_reset_engine(struct intel_engine_cs *engine, unsigned int flags)
> >
> > GEM_BUG_ON(!test_bit(I915_RESET_ENGINE + engine->id, &error->flags));
> >
> > - if (!(flags & I915_RESET_QUIET)) {
> > - dev_notice(engine->i915->drm.dev,
> > - "Resetting %s after gpu hang\n", engine->name);
> > - }
> > - error->reset_engine_count[engine->id]++;
> > -
> > active_request = i915_gem_reset_prepare_engine(engine);
> > - if (IS_ERR(active_request)) {
> > + if (IS_ERR_OR_NULL(active_request)) {
> > DRM_DEBUG_DRIVER("Previous reset failed, promote to full reset\n");
> > ret = PTR_ERR(active_request);
>
> Will a static checker complain about PTR_ERR(NULL)?
It shouldn't. PTR_ERR(NULL) -> 0 is one of the valid tricks of PTR_ERR.
> And the DRM_DEBUG_DRIVER isn't also correct in that case.
Bah, I was betting on those who read this would know that the full chip
reset was pardoned. If you want, we can just remove the debug.
-Chris
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