Message-ID: <YOLFREpQgResMOHK@phenom.ffwll.local>
Date:   Mon, 5 Jul 2021 10:39:32 +0200
From:   Daniel Vetter <daniel@...ll.ch>
To:     Jani Nikula <jani.nikula@...ux.intel.com>
Cc:     Corentin Labbe <clabbe.montjoie@...il.com>, mripard@...nel.org,
        tzimmermann@...e.de, airlied@...ux.ie, daniel@...ll.ch,
        dri-devel@...ts.freedesktop.org, maarten.lankhorst@...ux.intel.com,
        linux-kernel@...r.kernel.org, Kees Cook <keescook@...omium.org>,
        Arnd Bergmann <arnd@...nel.org>,
        Daniel Vetter <daniel.vetter@...ll.ch>
Subject: Re: drm: screen stuck since commit f611b1e7624c: drm: Avoid circular
 dependencies for CONFIG_FB

On Mon, Jul 05, 2021 at 11:21:22AM +0300, Jani Nikula wrote:
> On Sat, 03 Jul 2021, Corentin Labbe <clabbe.montjoie@...il.com> wrote:
> > Hello
> >
> > On next-20210701, my screen is stuck (see attached photo).
> > I bisect the problem to:
> > git bisect start
> > # good: [62fb9874f5da54fdb243003b386128037319b219] Linux 5.13
> > git bisect good 62fb9874f5da54fdb243003b386128037319b219
> > # bad: [fb0ca446157a86b75502c1636b0d81e642fe6bf1] Add linux-next specific files for 20210701
> > git bisect bad fb0ca446157a86b75502c1636b0d81e642fe6bf1
> > # good: [f63c4fda987a19b1194cc45cb72fd5bf968d9d90] Merge remote-tracking branch 'rdma/for-next'
> > git bisect good f63c4fda987a19b1194cc45cb72fd5bf968d9d90
> > # bad: [49c8769be0b910d4134eba07cae5d9c71b861c4a] Merge remote-tracking branch 'drm/drm-next'
> > git bisect bad 49c8769be0b910d4134eba07cae5d9c71b861c4a
> > # good: [4e3db44a242a4e2afe33b59793898ecbb61d478e] Merge tag 'wireless-drivers-next-2021-06-25' of git://git.kernel.org/pub/scm/linux/kernel/git/kvalo/wireless-drivers-next
> > git bisect good 4e3db44a242a4e2afe33b59793898ecbb61d478e
> > # good: [5745d647d5563d3e9d32013ad4e5c629acff04d7] Merge tag 'amd-drm-next-5.14-2021-06-02' of https://gitlab.freedesktop.org/agd5f/linux into drm-next
> > git bisect good 5745d647d5563d3e9d32013ad4e5c629acff04d7
> > # bad: [8fe44c080a53ac0ccbe88053a2e40f9acca33091] drm/amdgpu/display: fold DRM_AMD_DC_DCN3_1 into DRM_AMD_DC_DCN
> > git bisect bad 8fe44c080a53ac0ccbe88053a2e40f9acca33091
> > # good: [2c1b1ac7084edf477309d27c02d9da7f79b33cec] drm/amdgpu/vcn: drop gfxoff control for VCN2+
> > git bisect good 2c1b1ac7084edf477309d27c02d9da7f79b33cec
> > # good: [2c1b1ac7084edf477309d27c02d9da7f79b33cec] drm/amdgpu/vcn: drop gfxoff control for VCN2+
> > git bisect good 2c1b1ac7084edf477309d27c02d9da7f79b33cec
> > # bad: [d4c9b03ff6a9914b55e4e23fcac11339a2706cc6] drm/amd/pm: Add renoir throttler translation
> > git bisect bad d4c9b03ff6a9914b55e4e23fcac11339a2706cc6
> > # bad: [691cf8cd7a531dbfcc29d09a23c509a86fd9b24f] drm/amdgpu: use correct rounding macro for 64-bit
> > git bisect bad 691cf8cd7a531dbfcc29d09a23c509a86fd9b24f
> > # bad: [2fdcb55dfc86835e4845e3f422180b5596d23cb4] drm/amdkfd: use resource cursor in svm_migrate_copy_to_vram v2
> > git bisect bad 2fdcb55dfc86835e4845e3f422180b5596d23cb4
> > # bad: [6c3f953381e526a1623d4575660afae8b19ffa20] drm/sti/sti_hqvdp: Fix incorrectly named function 'sti_hqvdp_vtg_cb()'
> > git bisect bad 6c3f953381e526a1623d4575660afae8b19ffa20
> > # bad: [5ea4dba68305d9648b9dba30036cc36d4e877bca] drm/msm/a6xx: add CONFIG_QCOM_LLCC dependency
> > git bisect bad 5ea4dba68305d9648b9dba30036cc36d4e877bca
> > # good: [4a888ba03fd97d1cb0253581973533965bf348c4] drm/vgem/vgem_drv: Standard comment blocks should not use kernel-doc format
> > git bisect good 4a888ba03fd97d1cb0253581973533965bf348c4
> > # good: [c5ef15ae09637fb51ae43e1d1d98329d67dd4fd6] video: fbdev: atyfb: mach64_cursor.c: deleted the repeated word
> > git bisect good c5ef15ae09637fb51ae43e1d1d98329d67dd4fd6
> > # bad: [f611b1e7624ccdbd495c19e9805629e22265aa16] drm: Avoid circular dependencies for CONFIG_FB
> > git bisect bad f611b1e7624ccdbd495c19e9805629e22265aa16
> > # good: [ff323d6d72e1e4971c8ba9e2f3cf8afc48f22383] video: fbdev: mb862xx: use DEVICE_ATTR_RO macro
> > git bisect good ff323d6d72e1e4971c8ba9e2f3cf8afc48f22383
> > # first bad commit: [f611b1e7624ccdbd495c19e9805629e22265aa16] drm: Avoid circular dependencies for CONFIG_FB
> >
> > reverting ff323d6d72e1e4971c8ba9e2f3cf8afc48f22383 lead to a correct boot (I got a viewable login prompt).
> 
> I presume that's a copy-paste error, and you mean
> f611b1e7624ccdbd495c19e9805629e22265aa16, the first bad commit, i.e.
> 
> commit f611b1e7624ccdbd495c19e9805629e22265aa16
> Author: Kees Cook <keescook@...omium.org>
> Date:   Wed Jun 2 14:52:50 2021 -0700
> 
>     drm: Avoid circular dependencies for CONFIG_FB
> 
> > So ff323d6d72e1 cause this config change when compiling my defconfig:
> > --- config.fbok	2021-07-03 21:31:08.527260693 +0200
> > +++ config.fbko	2021-07-03 21:39:51.604275703 +0200
> > -CONFIG_VT_HW_CONSOLE_BINDING=y
> > +# CONFIG_VT_HW_CONSOLE_BINDING is not set
> > -CONFIG_DRM_FBDEV_EMULATION=y
> > -CONFIG_DRM_FBDEV_OVERALLOC=100
> > -CONFIG_FB_NOTIFY=y
> > -CONFIG_FB=y
> > -# CONFIG_FIRMWARE_EDID is not set
> > -CONFIG_FB_CFB_FILLRECT=y
> > -CONFIG_FB_CFB_COPYAREA=y
> > -CONFIG_FB_CFB_IMAGEBLIT=y
> > -CONFIG_FB_SYS_FILLRECT=y
> > -CONFIG_FB_SYS_COPYAREA=y
> > -CONFIG_FB_SYS_IMAGEBLIT=y
> > -# CONFIG_FB_FOREIGN_ENDIAN is not set
> > -CONFIG_FB_SYS_FOPS=y
> > -CONFIG_FB_DEFERRED_IO=y
> > -CONFIG_FB_MODE_HELPERS=y
> > -CONFIG_FB_TILEBLITTING=y
> > -
> > -#
> > -# Frame buffer hardware drivers
> > -#
> > -# CONFIG_FB_CIRRUS is not set
> > -# CONFIG_FB_PM2 is not set
> > -# CONFIG_FB_CYBER2000 is not set
> > -# CONFIG_FB_ARC is not set
> > -# CONFIG_FB_ASILIANT is not set
> > -# CONFIG_FB_IMSTT is not set
> > -# CONFIG_FB_VGA16 is not set
> > -# CONFIG_FB_UVESA is not set
> > -# CONFIG_FB_VESA is not set
> > -CONFIG_FB_EFI=y
> > -# CONFIG_FB_N411 is not set
> > -# CONFIG_FB_HGA is not set
> > -# CONFIG_FB_OPENCORES is not set
> > -# CONFIG_FB_S1D13XXX is not set
> > -# CONFIG_FB_NVIDIA is not set
> > -# CONFIG_FB_RIVA is not set
> > -# CONFIG_FB_I740 is not set
> > -# CONFIG_FB_LE80578 is not set
> > -# CONFIG_FB_MATROX is not set
> > -# CONFIG_FB_RADEON is not set
> > -# CONFIG_FB_ATY128 is not set
> > -# CONFIG_FB_ATY is not set
> > -# CONFIG_FB_S3 is not set
> > -# CONFIG_FB_SAVAGE is not set
> > -# CONFIG_FB_SIS is not set
> > -# CONFIG_FB_NEOMAGIC is not set
> > -# CONFIG_FB_KYRO is not set
> > -# CONFIG_FB_3DFX is not set
> > -# CONFIG_FB_VOODOO1 is not set
> > -# CONFIG_FB_VT8623 is not set
> > -# CONFIG_FB_TRIDENT is not set
> > -# CONFIG_FB_ARK is not set
> > -# CONFIG_FB_PM3 is not set
> > -# CONFIG_FB_CARMINE is not set
> > -# CONFIG_FB_SMSCUFX is not set
> > -# CONFIG_FB_UDL is not set
> > -# CONFIG_FB_IBM_GXT4500 is not set
> > -# CONFIG_FB_VIRTUAL is not set
> > -# CONFIG_FB_METRONOME is not set
> > -# CONFIG_FB_MB862XX is not set
> > -# CONFIG_FB_SIMPLE is not set
> > -# CONFIG_FB_SM712 is not set
> > +# CONFIG_FB is not set
> > -CONFIG_FRAMEBUFFER_CONSOLE=y
> > -CONFIG_FRAMEBUFFER_CONSOLE_DETECT_PRIMARY=y
> > -# CONFIG_FRAMEBUFFER_CONSOLE_ROTATION is not set
> > -# CONFIG_FRAMEBUFFER_CONSOLE_DEFERRED_TAKEOVER is not set
> > -
> > -CONFIG_LOGO=y
> > -# CONFIG_LOGO_LINUX_MONO is not set
> > -# CONFIG_LOGO_LINUX_VGA16 is not set
> > -CONFIG_LOGO_LINUX_CLUT224=y
> > -# CONFIG_FB_SM750 is not set
> > -# CONFIG_FONTS is not set
> > -CONFIG_FONT_8x8=y
> > +CONFIG_FONT_AUTOSELECT=y
> >
> > Adding CONFIG_FB to my defconfig fix also my boot.
> 
> Then you should do that. It's not like kconfig is UABI.
> 
> > But I still dont understand why the absence of CONFIG_FB led my screen stuck like this.
> 
> That's another question, and one uncovered, not caused, by the kconfig
> change.

There have also been reports on old radeon that somehow the fbcon
programming (just CONFIG_FB isn't enough) magically gets the gpu unstuck
on boot/resume. If this is nv50+ it's less likely, because with atomic
those different paths are gone.

Maybe to a bug report here about this: https://gitlab.freedesktop.org/drm/nouveau/-/issues
-Daniel
-- 
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch

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