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

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Message-ID: <20150325194014.GA24556@vader>
Date:	Wed, 25 Mar 2015 15:40:14 -0400
From:	Josh Boyer <jwboyer@...oraproject.org>
To:	Daniel Vetter <daniel@...ll.ch>
Cc:	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 01:37:41PM -0400, Josh Boyer wrote:
>>> >> 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.
>>>
>>> The drm-intel-nightly build finished first.  It boots without HDMI
>>> plugged in, but it has pretty much the same splats as the previous
>>> kernel.  Confused.  Full log here:
>>>
>>> https://jwboyer.fedorapeople.org/pub/intel-nightly.txt
>>>
>>> I don't have much hope for my other build.
>>
>> Yeah that's at least good news for the theory I've been cooking meanwhile.
>> Can you try the below diff (on top of next/nightly)? For the current
>> cherry-pick pile on top of 4.0-rc you'd need to prepend intel_crtc->base.
>> to primary->...
>>
>> Thanks, Daniel
>>
>> diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
>> index ceb2e61b4c91..cb508542c6ab 100644
>> --- a/drivers/gpu/drm/i915/intel_display.c
>> +++ b/drivers/gpu/drm/i915/intel_display.c
>> @@ -2594,6 +2594,7 @@ intel_find_plane_obj(struct intel_crtc *intel_crtc,
>>
>>                 primary->fb = &plane_config->fb->base;
>>                 primary->state->crtc = &intel_crtc->base;
>> +               primary->crtc = &intel_crtc->base;
>>                 update_state_fb(primary);
>>
>>                 return;
>> @@ -2627,6 +2628,7 @@ intel_find_plane_obj(struct intel_crtc *intel_crtc,
>>                         drm_framebuffer_reference(c->primary->fb);
>>                         primary->fb = c->primary->fb;
>>                         primary->state->crtc = &intel_crtc->base;
>> +                       primary->crtc = &intel_crtc->base;
>>                         update_state_fb(intel_crtc->base.primary);
>>                         obj->frontbuffer_bits |= INTEL_FRONTBUFFER_PRIMARY(intel_crtc->pipe);
>>                         break;
>
>Hey, that seems to do the trick on the NUC machine.  Boots without
>HDMI connected and there are no backtraces.  Nice!
>
>Let me go and munge it around for a backport on top of -rc5 with the
>rest of the pile and see if both the macbook and NUC machines work
>then.  Will be a bit for it to build.

OK, that helped on all my machines I have.  No backtraces and they all
boot again as I would expect.  For the record, here is what I have on
top of -rc5:

drm-Fixup-racy-refcounting-in-plane_force_disable.patch
drm-i915-Don-t-try-to-reference-the-fb-in-get_initia.patch

and this patch:

diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index 177714a9d778..778e7fa41c17 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -2439,6 +2439,8 @@ 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;
+		intel_crtc->base.primary->crtc = &intel_crtc->base;
 		update_state_fb(intel_crtc->base.primary);
 		return;
 	}
@@ -2469,6 +2471,8 @@ 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;
+			intel_crtc->base.primary->crtc = &intel_crtc->base;
 			obj->frontbuffer_bits |= INTEL_FRONTBUFFER_PRIMARY(intel_crtc->pipe);
 			break;
 		}

which is a mash-up of:

"drm/i915: Fix atomic state when reusing the firmware fb"

and

"drm/i915: Fixup legacy plane->crtc link for initial fb config"

which you just sent out.

I think that covers everything.

josh
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