linux-kernel - Re: linux-next: Tree for Jun 15 (drivers/gpu/drm/amd/amdgpu/../display/amdgpu_dm/amdgpu

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Date:   Wed, 15 Jun 2022 16:13:28 -0400
From:   Alex Deucher <alexdeucher@...il.com>
To:     Randy Dunlap <rdunlap@...radead.org>
Cc:     Stephen Rothwell <sfr@...b.auug.org.au>,
        Linux Next Mailing List <linux-next@...r.kernel.org>,
        "Pan, Xinhui" <Xinhui.Pan@....com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        "dri-devel@...ts.freedesktop.org" <dri-devel@...ts.freedesktop.org>,
        amd-gfx list <amd-gfx@...ts.freedesktop.org>,
        Alex Deucher <alexander.deucher@....com>,
        Christian König <christian.koenig@....com>
Subject: Re: linux-next: Tree for Jun 15 (drivers/gpu/drm/amd/amdgpu/../display/amdgpu_dm/amdgpu_dm.c)

On Wed, Jun 15, 2022 at 3:44 PM Randy Dunlap <rdunlap@...radead.org> wrote:
>
>
>
> On 6/15/22 12:28, Alex Deucher wrote:
> > On Wed, Jun 15, 2022 at 3:01 PM Randy Dunlap <rdunlap@...radead.org> wrote:
> >>
> >>
> >>
> >> On 6/14/22 23:01, Stephen Rothwell wrote:
> >>> Hi all,
> >>>
> >>> Changes since 20220614:
> >>>
> >>
> >> on i386:
> >> # CONFIG_DEBUG_FS is not set
> >>
> >>
> >> ../drivers/gpu/drm/amd/amdgpu/../display/amdgpu_dm/amdgpu_dm.c: In function ‘amdgpu_dm_crtc_late_register’:
> >> ../drivers/gpu/drm/amd/amdgpu/../display/amdgpu_dm/amdgpu_dm.c:6599:2: error: implicit declaration of function ‘crtc_debugfs_init’; did you mean ‘amdgpu_debugfs_init’? [-Werror=implicit-function-declaration]
> >>   crtc_debugfs_init(crtc);
> >>   ^~~~~~~~~~~~~~~~~
> >>   amdgpu_debugfs_init
> >>
> >>
> >> Full randconfig file is attached.
> >
> > I tried building with your config and I can't repro this.  As Harry
> > noted, that function and the whole secure display feature depend on
> > debugfs.  It should never be built without CONFIG_DEBUG_FS.  See
> > drivers/gpu/drm/amd/display/Kconfig:
>
> Did you try building with today's linux-next tree?
> (whatever is in it)
>
> I have seen this build error multiple times so it shouldn't
> be so difficult to repro it.
>
>
> >> config DRM_AMD_SECURE_DISPLAY
> >>         bool "Enable secure display support"
> >>         default n
> >>         depends on DEBUG_FS
> >>         depends on DRM_AMD_DC_DCN
> >>         help
> >>             Choose this option if you want to
> >>             support secure display
> >>
> >>             This option enables the calculation
> >>             of crc of specific region via debugfs.
> >>             Cooperate with specific DMCU FW.
> >
> > amdgpu_dm_crtc_late_register is guarded by
> > CONIG_DRM_AMD_SECURE_DISPLAY.  It's not clear to me how we could hit
> > this.

I was able to repro it.  In linux-next the
CONFIG_DRM_AMD_SECURE_DISPLAY ifdefs in
drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c seem to be missing.
I guess they were lost when the amdgpu branch was merged into
linux-next.  The attached patch restores the
CONFIG_DRM_AMD_SECURE_DISPLAY protections.

Thanks,

Alex

>
>
> --
> ~Randy

View attachment "0001-drm-amdgpu-fix-merge-of-amdgpu-next-branch.patch" of type "text/x-patch" (1434 bytes)