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 16:32:02 +0100 [thread overview]
Message-ID: <81a250d2-5469-6985-b9ed-62ee6a7b4326@amd.com> (raw)
In-Reply-To: <0847ff12-8b1c-a046-eb05-f0011f81e172@igalia.com>
Am 10.12.21 um 16:24 schrieb Guilherme G. Piccoli:
> On 10/12/2021 12:13, Christian König wrote:
>> [...]
>> How about issuing a PCIe reset and re-initializing the ASIC with just
>> the VBIOS?
>>
>> That should be pretty straightforward I think.
>>
>> Christian.
>
> Thanks Christian, that'd be perfect! Is it feasible? Per Alex comment,
> we'd need to run atombios commands to reprogram the timings, display
> info, etc...like a small driver would do, a full init.
>
> Also, what kind of PCIe reset is recommended for this adapter? Like a
> hot reset, powering-off/re-power, FLR or that MODE2 reset present in
> amdgpu code? Remembering this is an APU device.
Well, Alex is the expert on that.
APU makes the whole thing pretty tricky since the VBIOS is part of the
system BIOS there and I'm not sure you can only re-initialize the GPU
without a complete reset.
On dGPUs just making sure the ROM is mapped and calling the VESA modeset
BIOS functions might already do the trick.
Christian.
>
> Thanks a lot!
>
WARNING: multiple messages have this Message-ID (diff)
From: "Christian König" <christian.koenig@amd.com>
To: "Guilherme G. Piccoli" <gpiccoli@igalia.com>,
Alex Deucher <alexdeucher@gmail.com>
Cc: "Thomas Zimmermann" <tzimmermann@suse.de>,
"Gerd Hoffmann" <kraxel@redhat.com>,
"open list:EFIFB FRAMEBUFFER DRIVER"
<linux-fbdev@vger.kernel.org>,
kexec@lists.infradead.org,
"amd-gfx list" <amd-gfx@lists.freedesktop.org>,
kernel@gpiccoli.net, "Baoquan He" <bhe@redhat.com>,
"Samuel Iglesias Gonsálvez" <siglesias@igalia.com>,
"xinhui pan" <Xinhui.Pan@amd.com>,
"Maling list - DRI developers" <dri-devel@lists.freedesktop.org>,
pjones@redhat.com, "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 16:32:02 +0100 [thread overview]
Message-ID: <81a250d2-5469-6985-b9ed-62ee6a7b4326@amd.com> (raw)
In-Reply-To: <0847ff12-8b1c-a046-eb05-f0011f81e172@igalia.com>
Am 10.12.21 um 16:24 schrieb Guilherme G. Piccoli:
> On 10/12/2021 12:13, Christian König wrote:
>> [...]
>> How about issuing a PCIe reset and re-initializing the ASIC with just
>> the VBIOS?
>>
>> That should be pretty straightforward I think.
>>
>> Christian.
>
> Thanks Christian, that'd be perfect! Is it feasible? Per Alex comment,
> we'd need to run atombios commands to reprogram the timings, display
> info, etc...like a small driver would do, a full init.
>
> Also, what kind of PCIe reset is recommended for this adapter? Like a
> hot reset, powering-off/re-power, FLR or that MODE2 reset present in
> amdgpu code? Remembering this is an APU device.
Well, Alex is the expert on that.
APU makes the whole thing pretty tricky since the VBIOS is part of the
system BIOS there and I'm not sure you can only re-initialize the GPU
without a complete reset.
On dGPUs just making sure the ROM is mapped and calling the VESA modeset
BIOS functions might already do the trick.
Christian.
>
> Thanks a lot!
>
WARNING: multiple messages have this Message-ID (diff)
From: "Christian König" <christian.koenig@amd.com>
To: "Guilherme G. Piccoli" <gpiccoli@igalia.com>,
Alex Deucher <alexdeucher@gmail.com>
Cc: "Thomas Zimmermann" <tzimmermann@suse.de>,
"Gerd Hoffmann" <kraxel@redhat.com>,
"open list:EFIFB FRAMEBUFFER DRIVER"
<linux-fbdev@vger.kernel.org>,
kexec@lists.infradead.org,
"amd-gfx list" <amd-gfx@lists.freedesktop.org>,
kernel@gpiccoli.net, "Baoquan He" <bhe@redhat.com>,
"Samuel Iglesias Gonsálvez" <siglesias@igalia.com>,
"xinhui pan" <Xinhui.Pan@amd.com>,
"Maling list - DRI developers" <dri-devel@lists.freedesktop.org>,
pjones@redhat.com, "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 16:32:02 +0100 [thread overview]
Message-ID: <81a250d2-5469-6985-b9ed-62ee6a7b4326@amd.com> (raw)
In-Reply-To: <0847ff12-8b1c-a046-eb05-f0011f81e172@igalia.com>
Am 10.12.21 um 16:24 schrieb Guilherme G. Piccoli:
> On 10/12/2021 12:13, Christian König wrote:
>> [...]
>> How about issuing a PCIe reset and re-initializing the ASIC with just
>> the VBIOS?
>>
>> That should be pretty straightforward I think.
>>
>> Christian.
>
> Thanks Christian, that'd be perfect! Is it feasible? Per Alex comment,
> we'd need to run atombios commands to reprogram the timings, display
> info, etc...like a small driver would do, a full init.
>
> Also, what kind of PCIe reset is recommended for this adapter? Like a
> hot reset, powering-off/re-power, FLR or that MODE2 reset present in
> amdgpu code? Remembering this is an APU device.
Well, Alex is the expert on that.
APU makes the whole thing pretty tricky since the VBIOS is part of the
system BIOS there and I'm not sure you can only re-initialize the GPU
without a complete reset.
On dGPUs just making sure the ROM is mapped and calling the VESA modeset
BIOS functions might already do the trick.
Christian.
>
> Thanks a lot!
>
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next prev parent reply other threads:[~2021-12-10 15:32 UTC|newest]
Thread overview: 58+ 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 16:00 ` Guilherme G. Piccoli
2021-12-09 16:00 ` Guilherme G. Piccoli
2021-12-09 16:09 ` Christian König
2021-12-09 16:09 ` Christian König
2021-12-09 16:09 ` Christian König
2021-12-09 17:31 ` Alex Deucher
2021-12-09 17:31 ` Alex Deucher
2021-12-09 17:31 ` Alex Deucher
2021-12-09 17:59 ` Guilherme G. Piccoli
2021-12-09 17:59 ` Guilherme G. Piccoli
2021-12-09 17:59 ` Guilherme G. Piccoli
2021-12-09 18:06 ` Alex Deucher
2021-12-09 18:06 ` Alex Deucher
2021-12-09 18:06 ` Alex Deucher
2021-12-09 18:17 ` Guilherme G. Piccoli
2021-12-09 18:17 ` Guilherme G. Piccoli
2021-12-09 18:17 ` Guilherme G. Piccoli
2021-12-09 19:20 ` Alex Deucher
2021-12-09 19:20 ` Alex Deucher
2021-12-09 19:20 ` Alex Deucher
2021-12-10 7:19 ` Gerd Hoffmann
2021-12-10 7:19 ` Gerd Hoffmann
2021-12-10 7:19 ` Gerd Hoffmann
2021-12-10 7:19 ` Gerd Hoffmann
2021-12-10 8:24 ` Thomas Zimmermann
2021-12-10 8:24 ` Thomas Zimmermann
2021-12-10 14:08 ` Guilherme G. Piccoli
2021-12-10 14:08 ` Guilherme G. Piccoli
2021-12-10 14:08 ` Guilherme G. Piccoli
2021-12-10 14:16 ` Alex Deucher
2021-12-10 14:16 ` Alex Deucher
2021-12-10 14:16 ` Alex Deucher
2021-12-10 14:25 ` Guilherme G. Piccoli
2021-12-10 14:25 ` Guilherme G. Piccoli
2021-12-10 14:25 ` Guilherme G. Piccoli
2021-12-10 15:13 ` Christian König
2021-12-10 15:13 ` Christian König
2021-12-10 15:13 ` Christian König
2021-12-10 15:24 ` Guilherme G. Piccoli
2021-12-10 15:24 ` Guilherme G. Piccoli
2021-12-10 15:24 ` Guilherme G. Piccoli
2021-12-10 15:32 ` Christian König [this message]
2021-12-10 15:32 ` Christian König
2021-12-10 15:32 ` Christian König
2021-12-10 19:11 ` Alex Deucher
2021-12-10 19:11 ` Alex Deucher
2021-12-10 19:11 ` Alex Deucher
2021-12-11 0:54 ` Felix Kuehling
2021-12-11 0:54 ` Felix Kuehling
2021-12-11 0:54 ` Felix Kuehling
2021-12-11 9:20 ` Gerd Hoffmann
2021-12-11 9:20 ` Gerd Hoffmann
2021-12-11 9:20 ` Gerd Hoffmann
2021-12-11 9:20 ` Gerd Hoffmann
2021-12-10 19:05 ` Alex Deucher
2021-12-10 19:05 ` Alex Deucher
2021-12-10 19:05 ` Alex Deucher
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