On Thu, Jun 01, 2017 at 07:05:41PM +0300, Ville Syrjälä wrote:
> On Thu, Jun 01, 2017 at 05:48:16PM +0300, Jani Nikula wrote:
> > On Thu, 01 Jun 2017, ville.syrjala@xxxxxxxxxxxxxxx wrote:
> > > From: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx>
> > >
> > > If intel_crtc_disable_noatomic() were to ever get called during resume
> > > e'd end up deadlocking since resume has its own acqcuire_ctx but
> > > intel_crtc_disable_noatomic() still tries to use the
> > > mode_config.acquire_ctx. Pass down the correct acquire ctx from the top.
> >
> > Same here, have we seen this, or "just" theoretical?
>
> Happens on my 830 after adding the pipes powerwell. Before that the
> machine resumed with both pipes off and the pipe A quirk left
> crtc->active as false so intel_crtc_disable_noatomic() didn't get
> called.
>
> Hmm. Actually, now that I think about it more, I believe this should
> happen for S4 even without the new powerwell since both pipes should
> have been enabled by the BIOS when resuming from S4. I'll have to
> run a proper to test to verify that.
Indeed. In fact it deadlocks already during the thaw phase between
creating the hibernation image and writing to it disk.
>
> >
> > BR,
> > Jani.
> >
> > >
> > > Cc: stable@xxxxxxxxxxxxxxx
> > > Cc: Maarten Lankhorst <maarten.lankhorst@xxxxxxxxxxxxxxx>
> > > Fixes: e2c8b8701e2d ("drm/i915: Use atomic helpers for suspend, v2.")
> > > Signed-off-by: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx>
> > > ---
> > > drivers/gpu/drm/i915/intel_display.c | 9 +++++----
> > > 1 file changed, 5 insertions(+), 4 deletions(-)
> > >
> > > diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
> > > index 2f76a63efe8c..4e3c64ed4131 100644
> > > --- a/drivers/gpu/drm/i915/intel_display.c
> > > +++ b/drivers/gpu/drm/i915/intel_display.c
> > > @@ -5839,7 +5839,8 @@ static void i9xx_crtc_disable(struct intel_crtc_state *old_crtc_state,
> > > intel_update_watermarks(intel_crtc);
> > > }
> > >
> > > -static void intel_crtc_disable_noatomic(struct drm_crtc *crtc)
> > > +static void intel_crtc_disable_noatomic(struct drm_crtc *crtc,
> > > + struct drm_modeset_acquire_ctx *ctx)
> > > {
> > > struct intel_encoder *encoder;
> > > struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
> > > @@ -5869,7 +5870,7 @@ static void intel_crtc_disable_noatomic(struct drm_crtc *crtc)
> > > return;
> > > }
> > >
> > > - state->acquire_ctx = crtc->dev->mode_config.acquire_ctx;
> > > + state->acquire_ctx = ctx;
> > >
> > > /* Everything's already locked, -EDEADLK can't happen. */
> > > crtc_state = intel_atomic_get_crtc_state(state, intel_crtc);
> > > @@ -15257,7 +15258,7 @@ static void intel_sanitize_crtc(struct intel_crtc *crtc,
> > > plane = crtc->plane;
> > > crtc->base.primary->state->visible = true;
> > > crtc->plane = !plane;
> > > - intel_crtc_disable_noatomic(&crtc->base);
> > > + intel_crtc_disable_noatomic(&crtc->base, ctx);
> > > crtc->plane = plane;
> > > }
> > >
> > > @@ -15273,7 +15274,7 @@ static void intel_sanitize_crtc(struct intel_crtc *crtc,
> > > /* Adjust the state of the output pipe according to whether we
> > > * have active connectors/encoders. */
> > > if (crtc->active && !intel_crtc_has_encoders(crtc))
> > > - intel_crtc_disable_noatomic(&crtc->base);
> > > + intel_crtc_disable_noatomic(&crtc->base, ctx);
> > >
> > > if (crtc->active || HAS_GMCH_DISPLAY(dev_priv)) {
> > > /*
> >
> > --
> > Jani Nikula, Intel Open Source Technology Center
>
> --
> Ville Syrjälä
> Intel OTC
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--
Ville Syrjälä
Intel OTC
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