Re: Reuse framebuffer after a kexec (amdgpu / efifb)
From: Christian König <christian.koenig@amd.com>
Date: 2021-12-10 15:14:01
Also in:
amd-gfx, dri-devel, kexec
Am 10.12.21 um 15:25 schrieb Guilherme G. Piccoli:
On 10/12/2021 11:16, Alex Deucher wrote:> [...]quoted
Why not just reload the driver after kexec? AlexBecause 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.