From: "Dan Horák" <dan@danny.cz>
To: Xi Ruoyao <xry111@mengyan1223.wang>
Cc: "Christian König" <christian.koenig@amd.com>,
"Christian König" <ckoenig.leichtzumerken@gmail.com>,
"Alex Deucher" <alexander.deucher@amd.com>,
"David Airlie" <airlied@linux.ie>,
"Felix Kuehling" <Felix.Kuehling@amd.com>,
linux-kernel@vger.kernel.org, dri-devel@lists.freedesktop.org,
amd-gfx@lists.freedesktop.org, "Daniel Vetter" <daniel@ffwll.ch>,
stable@vger.kernel.org
Subject: Re: [PATCH] drm/amdgpu: fix an underflow on non-4KB-page systems
Date: Tue, 30 Mar 2021 15:23:00 +0200 [thread overview]
Message-ID: <20210330152300.b790099debcd7659e30d9bfd@danny.cz> (raw)
In-Reply-To: <63f5f6b39d22d9833a4c1503a34840eb08050f75.camel@mengyan1223.wang>
On Tue, 30 Mar 2021 21:09:12 +0800
Xi Ruoyao <xry111@mengyan1223.wang> wrote:
> On 2021-03-30 21:02 +0800, Xi Ruoyao wrote:
> > On 2021-03-30 14:55 +0200, Christian König wrote:
> > >
> > > I rather see this as a kernel bug. Can you test if this code fragment
> > > fixes your issue:
> > >
> > > diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_kms.c
> > > b/drivers/gpu/drm/amd/amdgpu/amdgpu_kms.c
> > > index 64beb3399604..e1260b517e1b 100644
> > > --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_kms.c
> > > +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_kms.c
> > > @@ -780,7 +780,7 @@ int amdgpu_info_ioctl(struct drm_device *dev, void
> > > *data, struct drm_file *filp)
> > > }
> > > dev_info->virtual_address_alignment =
> > > max((int)PAGE_SIZE, AMDGPU_GPU_PAGE_SIZE);
> > > dev_info->pte_fragment_size = (1 <<
> > > adev->vm_manager.fragment_size) * AMDGPU_GPU_PAGE_SIZE;
> > > - dev_info->gart_page_size = AMDGPU_GPU_PAGE_SIZE;
> > > + dev_info->gart_page_size =
> > > dev_info->virtual_address_alignment;
> > > dev_info->cu_active_number = adev->gfx.cu_info.number;
> > > dev_info->cu_ao_mask = adev->gfx.cu_info.ao_cu_mask;
> > > dev_info->ce_ram_size = adev->gfx.ce_ram_size;
> >
> > It works. I've seen it at
> > https://github.com/xen0n/linux/commit/84ada72983838bd7ce54bc32f5d34ac5b5aae191
> > before (with a common sub-expression, though :).
>
> Some comment: on an old version of Fedora ported by Loongson, Xorg just hangs
> without this commit. But on the system I built from source, I didn't see any
> issue before Linux 5.11. So I misbelieved that it was something already fixed.
>
> Dan: you can try it on your PPC 64 with non-4K page as well.
yup, looks good here as well, ppc64le (Power9) system with 64KB pages
Dan
next prev parent reply other threads:[~2021-03-30 13:24 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-03-29 17:53 [PATCH] drm/amdgpu: fix an underflow on non-4KB-page systems Xℹ Ruoyao
2021-03-29 18:04 ` Christian König
2021-03-29 18:08 ` Xi Ruoyao
2021-03-29 18:10 ` Christian König
2021-03-29 18:21 ` Xi Ruoyao
2021-03-29 18:30 ` Xi Ruoyao
2021-03-29 19:27 ` Xi Ruoyao
2021-03-29 19:36 ` Christian König
2021-03-29 19:40 ` Xi Ruoyao
2021-03-30 12:04 ` Xi Ruoyao
2021-03-30 12:55 ` Christian König
2021-03-30 13:00 ` Dan Horák
2021-03-30 13:02 ` Christian König
2021-03-30 13:02 ` Xi Ruoyao
2021-03-30 13:09 ` Xi Ruoyao
2021-03-30 13:23 ` Dan Horák [this message]
2021-03-30 13:24 ` Christian König
2021-03-30 15:46 ` Xi Ruoyao
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20210330152300.b790099debcd7659e30d9bfd@danny.cz \
--to=dan@danny.cz \
--cc=Felix.Kuehling@amd.com \
--cc=airlied@linux.ie \
--cc=alexander.deucher@amd.com \
--cc=amd-gfx@lists.freedesktop.org \
--cc=christian.koenig@amd.com \
--cc=ckoenig.leichtzumerken@gmail.com \
--cc=daniel@ffwll.ch \
--cc=dri-devel@lists.freedesktop.org \
--cc=linux-kernel@vger.kernel.org \
--cc=stable@vger.kernel.org \
--cc=xry111@mengyan1223.wang \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).