On Tue, Nov 20, 2018 at 07:37:17PM -0500, Lyude Paul wrote: > While trying to add a chamelium test for short HPD IRQs, I ran into > issues where a hotplug storm would be triggered, but the point at which > it would be reported by the kernel would be after igt actually finished > checking i915_hpd_storm_ctl's status. So, fix this by simply > synchronizing our IRQ work, dig_port_work, and hotplug_work before > printing out the HPD storm status in i915_hpd_storm_ctl_show(). > > Signed-off-by: Lyude Paul <lyude@xxxxxxxxxx> > Cc: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx> Makes sense. Reviewed-by: Daniel Vetter <daniel.vetter@xxxxxxxx> > --- > drivers/gpu/drm/i915/i915_debugfs.c | 7 +++++++ > 1 file changed, 7 insertions(+) > > diff --git a/drivers/gpu/drm/i915/i915_debugfs.c b/drivers/gpu/drm/i915/i915_debugfs.c > index 69447c68b9af..af4268a6d2d9 100644 > --- a/drivers/gpu/drm/i915/i915_debugfs.c > +++ b/drivers/gpu/drm/i915/i915_debugfs.c > @@ -4592,6 +4592,13 @@ static int i915_hpd_storm_ctl_show(struct seq_file *m, void *data) > struct drm_i915_private *dev_priv = m->private; > struct i915_hotplug *hotplug = &dev_priv->hotplug; > > + /* Synchronize with everything first in case there's been an HPD > + * storm, but we haven't finished handling it in the kernel yet > + */ > + synchronize_irq(dev_priv->drm.irq); > + flush_work(&dev_priv->hotplug.dig_port_work); > + flush_work(&dev_priv->hotplug.hotplug_work); > + > seq_printf(m, "Threshold: %d\n", hotplug->hpd_storm_threshold); > seq_printf(m, "Detected: %s\n", > yesno(delayed_work_pending(&hotplug->reenable_work))); > -- > 2.19.1 > > _______________________________________________ > dri-devel mailing list > dri-devel@xxxxxxxxxxxxxxxxxxxxx > https://lists.freedesktop.org/mailman/listinfo/dri-devel -- Daniel Vetter Software Engineer, Intel Corporation http://blog.ffwll.ch _______________________________________________ dri-devel mailing list dri-devel@xxxxxxxxxxxxxxxxxxxxx https://lists.freedesktop.org/mailman/listinfo/dri-devel
