From: "Christian König" <christian.koenig@amd.com>
To: "Guilherme G. Piccoli" <gpiccoli@igalia.com>,
Alex Deucher <alexdeucher@gmail.com>
Cc: "open list:EFIFB FRAMEBUFFER DRIVER"
<linux-fbdev@vger.kernel.org>, "xinhui pan" <Xinhui.Pan@amd.com>,
"Maling list - DRI developers" <dri-devel@lists.freedesktop.org>,
"Baoquan He" <bhe@redhat.com>,
"Samuel Iglesias Gonsálvez" <siglesias@igalia.com>,
kernel@gpiccoli.net, kexec@lists.infradead.org,
"amd-gfx list" <amd-gfx@lists.freedesktop.org>,
pjones@redhat.com, "Gerd Hoffmann" <kraxel@redhat.com>,
"Thomas Zimmermann" <tzimmermann@suse.de>,
"Deucher, Alexander" <alexander.deucher@amd.com>,
"Dave Young" <dyoung@redhat.com>,
"Vivek Goyal" <vgoyal@redhat.com>
Subject: Re: Reuse framebuffer after a kexec (amdgpu / efifb)
Date: Fri, 10 Dec 2021 16:13:48 +0100 [thread overview]
Message-ID: <d1de6ca3-11ae-af9e-a2fb-7bcb6fae01d6@amd.com> (raw)
In-Reply-To: <56dfb915-036b-0584-f0ef-83c786970d6e@igalia.com>
Am 10.12.21 um 15:25 schrieb Guilherme G. Piccoli:
> On 10/12/2021 11:16, Alex Deucher wrote:> [...]
>> Why not just reload the driver after kexec?
>>
>> Alex
> Because the original issue is the kdump case, and we want a very very
> tiny kernel - also, the crash originally could have been caused by
> amdgpu itself, so if it's a GPU issue, we don't want to mess with that
> in kdump. And I confess I tried modprobe amdgpu after a kdump, no
> success - kdump won't call shutdown handlers, so GPU will be in a
> "rogue" state...
>
> My question was about regular kexec because it's much simpler usually,
> we can do whatever we want there. My line of thought was: if I make it
> work in regular kexec with a simple framebuffer, I might be able to get
> it working on kdump heheh
How about issuing a PCIe reset and re-initializing the ASIC with just
the VBIOS?
That should be pretty straightforward I think.
Christian.
next prev parent reply other threads:[~2021-12-10 15:14 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-12-09 16:00 Reuse framebuffer after a kexec (amdgpu / efifb) Guilherme G. Piccoli
2021-12-09 16:09 ` Christian König
2021-12-09 17:31 ` Alex Deucher
2021-12-09 17:59 ` Guilherme G. Piccoli
2021-12-09 18:06 ` Alex Deucher
2021-12-09 18:17 ` Guilherme G. Piccoli
2021-12-09 19:20 ` Alex Deucher
2021-12-10 7:19 ` Gerd Hoffmann
2021-12-10 8:24 ` Thomas Zimmermann
2021-12-10 14:08 ` Guilherme G. Piccoli
2021-12-10 14:16 ` Alex Deucher
2021-12-10 14:25 ` Guilherme G. Piccoli
2021-12-10 15:13 ` Christian König [this message]
2021-12-10 15:24 ` Guilherme G. Piccoli
2021-12-10 15:32 ` Christian König
2021-12-10 19:11 ` Alex Deucher
2021-12-11 0:54 ` Felix Kuehling
2021-12-11 9:20 ` Gerd Hoffmann
2021-12-10 19:05 ` Alex Deucher
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