linux-kernel - Re: [Intel-gfx] [git pull] drm fixes

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Date:	Wed, 25 Mar 2015 11:53:41 -0400
From:	Josh Boyer <jwboyer@...oraproject.org>
To:	Daniel Vetter <daniel@...ll.ch>, Dave Airlie <airlied@...ux.ie>,
	Xi Ruoyao <xry111@...look.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	"Linux-Kernel@...r. Kernel. Org" <linux-kernel@...r.kernel.org>,
	DRI mailing list <dri-devel@...ts.freedesktop.org>,
	Intel Graphics Development <intel-gfx@...ts.freedesktop.org>
Subject: Re: [Intel-gfx] [git pull] drm fixes

On Wed, Mar 25, 2015 at 11:50 AM, Daniel Vetter <daniel@...ll.ch> wrote:
> On Wed, Mar 25, 2015 at 11:37:35AM -0400, Josh Boyer wrote:
>> On Wed, Mar 25, 2015 at 10:00 AM, Daniel Vetter <daniel@...ll.ch> wrote:
>> > On Wed, Mar 25, 2015 at 09:11:17AM -0400, Josh Boyer wrote:
>> >> On Wed, Mar 25, 2015 at 4:54 AM, Daniel Vetter <daniel@...ll.ch> wrote:
>> >> >> >> commit f55548b5af87ebfc586ca75748947f1c1b1a4a52
>> >> >> >> Author: Damien Lespiau <damien.lespiau@...el.com>
>> >> >> >> Date:   Thu Feb 5 18:30:20 2015 +0000
>> >> >> >>
>> >> >> >>     drm/i915: Don't try to reference the fb in get_initial_plane_config()
>> >> >> >>
>> >> >> >> From linux-next?
>> >> >> >
>> >> >> > Yes, building now.  Will let you know as soon as I test it on both machines.
>> >> >>
>> >> >> OK, with that commit applied I no longer get the kref.h splat and the
>> >> >> NUC machine boots headless.  I still see the backtrace below on both
>> >> >> the NUC and the macbook.  I have a copy of it with drm.debug=0xff from
>> >> >> the NUC here:
>> >> >>
>> >> >> https://jwboyer.fedorapeople.org/pub/nuc-drm-debug-ff-with-fixes.txt
>> >> >>
>> >> >> Getting better at least :).
>> >> >
>> >> > On top of what you currently have please also cherry-pick
>> >> >
>> >> > commit fb9981aa675eb7b398849915364916fd98833cfa
>> >> > Author: Damien Lespiau <damien.lespiau@...el.com>
>> >> > Date:   Thu Feb 5 19:24:25 2015 +0000
>> >> >
>> >> >     drm/i915: Fix atomic state when reusing the firmware fb
>> >> >
>> >> > from -next. Let's hope this terminates eventually ;-)
>> >>
>> >> Hm.  That one doesn't apply cleanly.  I think because it needs:
>> >>
>> >> From 2d14030b1a9d0e89cfdca6f16851e2eac8cb4de0 Mon Sep 17 00:00:00 2001
>> >> From: Damien Lespiau <damien.lespiau@...el.com>
>> >> Date: Thu, 5 Feb 2015 17:22:18 +0000
>> >> Subject: drm/i915: Store the initial framebuffer in initial_plane_config
>> >>
>> >> first.  Do you want me to grab both, or should I try and figure out
>> >> how to backport fb9981aa67 without it?
>> >
>> > Oops missed that. The active ingredient is setting crtc->primary->state->crtc like this:
>> > -Daniel
>> >
>> >
>> > diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
>> > index 1c12262029fb..bfc14a6046ea 100644
>> > --- a/drivers/gpu/drm/i915/intel_display.c
>> > +++ b/drivers/gpu/drm/i915/intel_display.c
>> > @@ -2439,6 +2439,7 @@ intel_find_plane_obj(struct intel_crtc *intel_crtc,
>> >                 return;
>> >
>> >         if (intel_alloc_plane_obj(intel_crtc, plane_config)) {
>> > +               intel_crtc->base.primary->state->crtc = &intel_crtc->base;
>> >                 update_state_fb(intel_crtc->base.primary);
>> >                 return;
>> >         }
>> > @@ -2469,6 +2470,7 @@ intel_find_plane_obj(struct intel_crtc *intel_crtc,
>> >
>> >                         drm_framebuffer_reference(c->primary->fb);
>> >                         intel_crtc->base.primary->fb = c->primary->fb;
>> > +                       intel_crtc->base.primary->state->crtc = &intel_crtc->base;
>> >                         obj->frontbuffer_bits |= INTEL_FRONTBUFFER_PRIMARY(intel_crtc->pipe);
>> >                         break;
>> >                 }
>>
>> Hm.  So I used your patch above.  The macbook boots fine and all the
>> oops/WARNS are gone except the audio one that was unrelated and
>> present before all of this.
>>
>> However, the NUC is back to not booting without HDMI plugged in.  I
>> did the drm.debug=0xff+blacklist/insmod trick again and put the
>> results up here:
>>
>> https://jwboyer.fedorapeople.org/pub/vetters.txt
>>
>> The frontbuffer splat is back now.
>>
>> I confirmed multiple times that the NUC boots fine with the kernel
>> that doesn't include the above patch but has the other two included
>> (albeit with the drm_atomic WARN still).
>>
>> Not sure what to make of this one.
>
> Yeah that fail looks like we're freeing an fb that's still in use.
> Hilarity happens and since that happens under console_lock at boot-up your
> machine dies.
>
> Does that machine die the same way in drm-intel-nightly/linux-next?

I'll try that a bit later today.  Out of sheer curiosity, I folded
commit5ba76c41e55c (drm/i915: Put update_state_fb() next to the fb
update) into the patch above and kicked off a build.  The theory is
that we're picking up a bunch of other changes right in that range of
commits, why not try one more.  I'll let you know if that fixes
anything.  Otherwise, I'll try building drm-intel-nightly and/or
linux-next after that.

josh
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