Re: F42 Change Proposal: Enable Drm Panic (system-wide)

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On Tue, Jul 16, 2024 at 8:35 AM Jocelyn Falempe <jfalempe@xxxxxxxxxx> wrote:
>
>
>
> On 16/07/2024 14:05, Neal Gompa wrote:
> > On Tue, Jul 16, 2024 at 7:49 AM Jocelyn Falempe <jfalempe@xxxxxxxxxx> wrote:
> >>
> >> I've made a test kernel build with drm_panic enabled (and VT_CONSOLE
> >> disabled):
> >>
> >> https://koji.fedoraproject.org/koji/taskinfo?taskID=120544794
> >>
> >> I've backported a few patches, that are not in v6.10, like:
> >> short panic description:
> >> https://patchwork.freedesktop.org/series/135356/
> >> kmsg panic_screen:
> >> https://patchwork.freedesktop.org/series/134286/
> >> draft nouveau support (tested on 1650X, might be garbage on other GPU):
> >> https://patchwork.freedesktop.org/series/133963/
> >> And also virtio-gpu support, so you can test it easily on a VM.
> >>
> >> To install the test kernel, download the rpms kernel, kernel-core,
> >> kernel-modules, kernel-modules-core, kernel-modules-extra, and install
> >> them with dnf.
> >> It's a Fedora rawhide kernel, but can be installed on F40.
> >>
> >> i915, amdgpu, and nvidia are not yet supported, so you need to blacklist
> >> them, in order to use simpledrm, if you want to see the panic screen.
> >>
> >
> > Do you expect to see the rest of the drivers supported by the time
> > Fedora 42 rolls around? Because if it only works with nouveau, it's
> > probably not worth enabling.
> >
>
> I think it's a bit of a chicken and egg problem. If no distro enables
> it, there will be little incentive for the drivers to add support.
>
> Also, on all hardware, simpledrm is used at boot, so common kernel panic
> like "unable to mount /", or "failed to execute /init", will use drm_panic.
>
> FYI, I opened an issue for amdgpu here:
> https://gitlab.freedesktop.org/drm/amd/-/issues/3340
>
> And for i915 here:
> https://gitlab.freedesktop.org/drm/i915/kernel/-/issues/10954
>

Forgive me for the potentially dumb question, but why does every
driver have to individually implement support for it? DRM is a
framework, right? So how come it's not implemented in a way such that
all DRM drivers get it "for free"?



-- 
真実はいつも一つ!/ Always, there's only one truth!
-- 
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