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Subject: Re: [Intel-gfx] [git pull] drm fixes
From: Josh Boyer <jwboyer@fedoraproject.org>
To: Daniel Vetter <daniel@ffwll.ch>
Cc: Dave Airlie <airlied@linux.ie>, Xi Ruoyao <xry111@outlook.com>,
        Linus Torvalds <torvalds@linux-foundation.org>,
        "Linux-Kernel@Vger. Kernel. Org" <linux-kernel@vger.kernel.org>,
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On Tue, Mar 24, 2015 at 10:46 AM, Josh Boyer <jwboyer@fedoraproject.org> wrote:
> On Tue, Mar 24, 2015 at 10:34 AM, Daniel Vetter <daniel@ffwll.ch> wrote:
>> On Tue, Mar 24, 2015 at 10:22:30AM -0400, Josh Boyer wrote:
>>> On Tue, Mar 24, 2015 at 9:57 AM, Josh Boyer <jwboyer@fedoraproject.org> wrote:
>>> > On Tue, Mar 24, 2015 at 9:40 AM, Daniel Vetter <daniel@ffwll.ch> wrote:
>>> >> On Tue, Mar 24, 2015 at 09:15:32AM -0400, Josh Boyer wrote:
>>> >>> On Tue, Mar 24, 2015 at 3:32 AM, Daniel Vetter <daniel@ffwll.ch> wrote:
>>> >>> > On Mon, Mar 23, 2015 at 02:34:27PM -0400, Josh Boyer wrote:
>>> >>> >> On Mon, Mar 23, 2015 at 11:33 AM, Josh Boyer <jwboyer@fedoraproject.org> wrote:
>>> >>> >>
>>> >>> >> <snip>
>>> >>> >>
>>> >>> >> >> Xi Ruoyao (1):
>>> >>> >> >>       drm/i915: Ensure plane->state->fb stays in sync with plane->fb
>>> >>> >>
>>> >>> >> Turns out to be that commit.
>>> >>> >>
>>> >>> >> git bisect start 'drivers/gpu/drm/i915/'
>>> >>> >> # good: [b314acaccd7e0d55314d96be4a33b5f50d0b3344] Merge branch
>>> >>> >> 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input
>>> >>> >> git bisect good b314acaccd7e0d55314d96be4a33b5f50d0b3344
>>> >>> >> # bad: [bc465aa9d045feb0e13b4a8f32cc33c1943f62d6] Linux 4.0-rc5
>>> >>> >> git bisect bad bc465aa9d045feb0e13b4a8f32cc33c1943f62d6
>>> >>> >> # bad: [319c1d420a0b62d9dbb88104afebaabc968cdbfa] drm/i915: Ensure
>>> >>> >> plane->state->fb stays in sync with plane->fb
>>> >>> >> git bisect bad 319c1d420a0b62d9dbb88104afebaabc968cdbfa
>>> >>> >> # first bad commit: [319c1d420a0b62d9dbb88104afebaabc968cdbfa]
>>> >>> >> drm/i915: Ensure plane->state->fb stays in sync with plane->fb
>>> >>> >>
>>> >>> >> Doing a straight revert on top of 4.0-rc5 makes things work again,
>>> >>> >> albeit with the WARN_ON(obj->frontbuffer_bits) splat still being
>>> >>> >> there.
>>> >>> >
>>> >>> > Can you please test the tip of drm-fixes:
>>> >>> >
>>> >>> > commit 8218c3f4df3bb1c637c17552405039a6dd3c1ee1
>>> >>> > Author: Daniel Vetter <daniel.vetter@ffwll.ch>
>>> >>> > Date:   Fri Feb 27 12:58:13 2015 +0100
>>> >>> >
>>> >>> >     drm: Fixup racy refcounting in plane_force_disable
>>> >>> >
>>> >>> > http://cgit.freedesktop.org/~airlied/linux/commit/?h=drm-fixes&id=8218c3f4df3bb1c637c17552405039a6dd3c1ee1
>>> >>> >
>>> >>> > Because fumble that patch didn't make it to drm-fixes a while ago and
>>> >>> > instead landed in drm-next.
>>> >>>
>>> >>> That seems to have helped with totally different issues a macbook I
>>> >>> have was seeing.  However, it still doesn't fix the issue with the
>>> >>> Celeron based NUC machine.
>>> >>>
>>> >>> I built a kernel based on Linus' latest tree as of this morning,
>>> >>> without reverting 319c1d4 and adding the commit you pointed to.  The
>>> >>> NUC still won't boot without HDMI connected.  With HDMI connected I
>>> >>> still see the trace below.  If I do the blacklist and then insmod
>>> >>> dance with HDMI unplugged it shows the same spew I reported yesterday
>>> >>> which starts with the same backtrace.
>>> >>>
>>> >>> I'll try building a kernel with 319c1d4 reverted + your patch.  I
>>> >>> suspect things will work fine with that combination because the two
>>> >>> issues are unrelated.
>>> >>
>>> >> Can you please boot with drm.debug=0xff for the below case and grab
>>> >> complete dmesg? There'll be a lot of crap in the logs, you might need to
>>> >> blow up the logbuf size massively. But that log should contain everything
>>> >> I need to figure out where that framebuffer we're blowing up on is going.
>>> >
>>> > I provided both with HDMI attached and without (via insmod).  If you
>>> > want them emailed directly let me know, but they were large.
>>> >
>>> > Boot with drm.debug=0xff and HDMI connected:
>>> >
>>> > https://jwboyer.fedorapeople.org/pub/drm-ff-dmesg.txt
>>> >
>>> > Boot with drm.debug=0xff without HDMI connected and i915 loaded via
>>> > manual insmod after boot:
>>> >
>>> > https://jwboyer.fedorapeople.org/pub/drm-ff-no-hdmi-insmod.txt
>>>
>>> Here's one more from the macbook I mentioned.  It's showing the same
>>> kref.h splat:
>>>
>>> https://jwboyer.fedorapeople.org/pub/drm-ff-macbook.txt
>>
>> Ok there's at least one fixup for which we've failed to apply when porting
>> the fb refcounting fix from -next. Can you please cherry-pick
>>
>> commit f55548b5af87ebfc586ca75748947f1c1b1a4a52
>> Author: Damien Lespiau <damien.lespiau@intel.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 :).

josh

[  +0.000372] [drm] Initialized i915 1.6.0 20150130 for 0000:00:02.0 on minor 0
[  +0.059774] [drm] GMBUS [i915 gmbus vga] timed out, falling back to
bit banging on pin 2
[  +0.012442] fbcon: inteldrmfb (fb0) is primary device
[  +0.000103] ------------[ cut here ]------------
[  +0.000024] WARNING: CPU: 1 PID: 109 at
drivers/gpu/drm/drm_atomic.c:482 drm_atomic_check_only+0x33d/0x500
[drm]()
[  +0.000006] Modules linked in: i915 i2c_algo_bit drm_kms_helper drm
sdhci_pci sdhci mmc_core video
[  +0.000004] CPU: 1 PID: 109 Comm: kworker/u16:7 Not tainted
4.0.0-0.rc5.git1.3.fc23.x86_64 #1
[  +0.000001] Hardware name: Apple Inc.
MacBookPro10,2/Mac-AFD8A9D944EA4843, BIOS
MBP102.88Z.0106.B03.1211161133 11/16/2012
[  +0.000005] Workqueue: events_unbound async_run_entry_fn
[  +0.000003]  0000000000000000 00000000cbdcc84e ffff8802628bb868
ffffffff8177ada9
[  +0.000002]  0000000000000000 0000000000000000 ffff8802628bb8a8
ffffffff8109c78a
[  +0.000002]  ffff88026154c940 0000000000000048 ffff880262b1e600
ffff88026229e2a0
[  +0.000001] Call Trace:
[  +0.000007]  [<ffffffff8177ada9>] dump_stack+0x45/0x57
[  +0.000003]  [<ffffffff8109c78a>] warn_slowpath_common+0x8a/0xc0
[  +0.000003]  [<ffffffff8109c8ba>] warn_slowpath_null+0x1a/0x20
[  +0.000014]  [<ffffffffa00700ed>] drm_atomic_check_only+0x33d/0x500 [drm]
[  +0.000005]  [<ffffffff811bc0a6>] ? kmemdup+0x36/0x50
[  +0.000013]  [<ffffffffa00702c7>] drm_atomic_commit+0x17/0x60 [drm]
[  +0.000008]  [<ffffffffa00c371d>]
drm_atomic_helper_plane_set_property+0x8d/0xd0 [drm_kms_helper]
[  +0.000013]  [<ffffffffa005e89d>] drm_mode_plane_set_obj_prop+0x2d/0x90 [drm]
[  +0.000006]  [<ffffffffa00c550b>] restore_fbdev_mode+0x6b/0xf0
[drm_kms_helper]
[  +0.000006]  [<ffffffffa00c75c9>]
drm_fb_helper_restore_fbdev_mode_unlocked+0x29/0x80 [drm_kms_helper]
[  +0.000006]  [<ffffffffa00c7642>] drm_fb_helper_set_par+0x22/0x50
[drm_kms_helper]
[  +0.000042]  [<ffffffffa016959a>] intel_fbdev_set_par+0x1a/0x60 [i915]
[  +0.000005]  [<ffffffff8140c328>] fbcon_init+0x578/0x600
[  +0.000005]  [<ffffffff8148ceac>] visual_init+0xbc/0x120
[  +0.000004]  [<ffffffff8148f84e>] do_bind_con_driver+0x17e/0x3b0
[  +0.000007]  [<ffffffff8148ffd4>] do_take_over_console+0xb4/0x1b0
[  +0.000013]  [<ffffffff81407163>] do_fbcon_takeover+0x63/0xd0
[  +0.000003]  [<ffffffff8140ce4d>] fbcon_event_notify+0x6cd/0x7d0
[  +0.000005]  [<ffffffff810bc18f>] notifier_call_chain+0x4f/0x80
[  +0.000003]  [<ffffffff810bc50b>] __blocking_notifier_call_chain+0x4b/0x70
[  +0.000002]  [<ffffffff810bc546>] blocking_notifier_call_chain+0x16/0x20
[  +0.000003]  [<ffffffff81412dbb>] fb_notifier_call_chain+0x1b/0x20
[  +0.000013]  [<ffffffff81415184>] register_framebuffer+0x214/0x360
[  +0.000007]  [<ffffffffa00c78d4>]
drm_fb_helper_initial_config+0x264/0x3c0 [drm_kms_helper]
[  +0.000004]  [<ffffffff810d8401>] ? pick_next_task_fair+0x121/0x8b0
[  +0.000034]  [<ffffffffa016a89b>] intel_fbdev_initial_config+0x1b/0x20 [i915]
[  +0.000002]  [<ffffffff810bdd1a>] async_run_entry_fn+0x4a/0x150
[  +0.000002]  [<ffffffff810b552c>] process_one_work+0x14c/0x400
[  +0.000002]  [<ffffffff810b5fb3>] worker_thread+0x53/0x470
[  +0.000003]  [<ffffffff810b5f60>] ? rescuer_thread+0x300/0x300
[  +0.000002]  [<ffffffff810b5f60>] ? rescuer_thread+0x300/0x300
[  +0.000002]  [<ffffffff810bb1f8>] kthread+0xd8/0xf0
[  +0.000004]  [<ffffffff810bb120>] ? kthread_create_on_node+0x1b0/0x1b0
[  +0.000004]  [<ffffffff81781458>] ret_from_fork+0x58/0x90
[  +0.000003]  [<ffffffff810bb120>] ? kthread_create_on_node+0x1b0/0x1b0
[  +0.000002] ---[ end trace a73ba186968c6ec8 ]---

From mboxrd@z Thu Jan  1 00:00:00 1970
From: Josh Boyer <jwboyer@fedoraproject.org>
Subject: Re: [git pull] drm fixes
Date: Tue, 24 Mar 2015 12:10:28 -0400
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