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Message-ID: <CABXGCsNztS8MLteq5=fcddwuQ1TCzeOM8TdVtpJ3crK=sV5PTQ@mail.gmail.com> Date: Sun, 25 Aug 2024 02:12:34 +0500 From: Mikhail Gavrilov <mikhail.v.gavrilov@...il.com> To: Leo Li <sunpeng.li@....com>, Harry Wentland <harry.wentland@....com>, zaeem.mohamed@....com, pekka.paalanen@...labora.com, "Wheeler, Daniel" <daniel.wheeler@....com>, "Deucher, Alexander" <alexander.deucher@....com>, amd-gfx list <amd-gfx@...ts.freedesktop.org>, dri-devel <dri-devel@...ts.freedesktop.org>, Linux List Kernel Mailing <linux-kernel@...r.kernel.org>, Linux regressions mailing list <regressions@...ts.linux.dev> Subject: Re: 6.11/regression/bisected - after commit 1b04dcca4fb1, launching some RenPy games causes computer hang On Mon, Aug 5, 2024 at 11:05 PM Mikhail Gavrilov <mikhail.v.gavrilov@...il.com> wrote: > > Hi, > After commit 1b04dcca4fb1, launching some RenPy games causes computer hang. > After the hang, even Alt + sysrq + REISUB can't reboot the computer! > And no trace in the kernel log! > For demonstration, I'm going to use the game "Find the Orange Narwhal" > because it is free and has 100% reproducivity for this issue. > You can find it in the Steam Store: > https://store.steampowered.com/app/2946010/Find_the_Orange_Narwhal/ > I uploaded demonstration video to youtube: https://youtu.be/yVW6rImRpXw > > Unfortunately, I can't check the revert commit 1541d63c5fe2 because of > conflicts. > > mikhail@...mary-ws ~/p/g/linux (master)> git reset v6.11-rc1 --hard > HEAD is now at 8400291e289e Linux 6.11-rc1 > > mikhail@...mary-ws ~/p/g/linux (master)> git revert -n 1b04dcca4fb1 > Auto-merging drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c > CONFLICT (content): Merge conflict in > drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c > Auto-merging drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.h > Auto-merging drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_crtc.c > Auto-merging drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_plane.c > CONFLICT (content): Merge conflict in > drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_plane.c > error: could not revert 1b04dcca4fb1... drm/amd/display: Introduce > overlay cursor mode > hint: after resolving the conflicts, mark the corrected paths > hint: with 'git add <paths>' or 'git rm <paths>' > hint: Disable this message with "git config advice.mergeConflict false" > > commit 1b04dcca4fb10dd3834893a60de74edd99f2bfaf > Author: Leo Li <sunpeng.li@....com> > Date: Thu Jan 18 16:29:49 2024 -0500 > > drm/amd/display: Introduce overlay cursor mode > > [Why] > > DCN is the display hardware for amdgpu. DRM planes are backed by DCN > hardware pipes, which carry pixel data from one end (memory), to the > other (output encoder). > > Each DCN pipe has the ability to blend in a cursor early on in the > pipeline. In other words, there are no dedicated cursor planes in DCN, > which makes cursor behavior somewhat unintuitive for compositors. > > For example, if the cursor is in RGB format, but the top-most DRM plane > is in YUV format, DCN will not be able to blend them. Because of this, > amdgpu_dm rejects all configurations where a cursor needs to be enabled > on top of a YUV formatted plane. > > From a compositor's perspective, when computing an allocation for > hardware plane offloading, this cursor-on-yuv configuration result in an > atomic test failure. Since the failure reason is not obvious at all, > compositors will likely fall back to full rendering, which is not ideal. > > Instead, amdgpu_dm can try to accommodate the cursor-on-yuv > configuration by opportunistically reserving a separate DCN pipe just > for the cursor. We can refer to this as "overlay cursor mode". It is > contrasted with "native cursor mode", where the native DCN per-pipe > cursor is used. > > [How] > > On each crtc, compute whether the cursor plane should be enabled in > overlay mode. If it is, mark the CRTC as requesting overlay cursor mode. > > Overlay cursor should be enabled whenever there exists a underlying > plane that has YUV format, or is scaled differently than the cursor. It > should also be enabled if there is no underlying plane, or if underlying > planes do not cover the entire CRTC. > > During DC validation, attempt to enable a separate DCN pipe for the > cursor if it's in overlay mode. If that fails, or if no overlay mode is > requested, then fallback to native mode. > > v2: > * Update commit message for when overlay cursor should be enabled > * Also consider scale and no-underlying-plane case (cursor on crtc bg) > * Consider all underlying planes when determinig overlay/native, not > just the plane immediately beneath the cursor, as it may not cover the > entire CRTC. > * Fix typo s/decending/descending/ > * Force native cursor on pre-DCN hardware > > Reviewed-by: Harry Wentland <harry.wentland@....com> > Acked-by: Zaeem Mohamed <zaeem.mohamed@....com> > Signed-off-by: Leo Li <sunpeng.li@....com> > Acked-by: Harry Wentland <harry.wentland@....com> > Acked-by: Pekka Paalanen <pekka.paalanen@...labora.com> > Tested-by: Daniel Wheeler <daniel.wheeler@....com> > Signed-off-by: Alex Deucher <alexander.deucher@....com> > > drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c | 490 > +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++------------------------------------------- > drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.h | 7 +++ > drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_crtc.c | 1 + > drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_plane.c | 13 ++++- > 4 files changed, 389 insertions(+), 122 deletions(-) > > > My hardware specs are: https://linux-hardware.org/?probe=61bd7390a9 > > Leo, can you look into it, please? > Hi, Is anyone trying to look into it? I continue to reproduce this issue on fresh kernel builds 6.11-rc4+. In addition to the RenPy engine, the problem also reproduces on games from Ubisoft, such as Far Cry 4. A very important note that I missed in the first message. To reproduce the problem, you need to enable scaling in Gnome for HiDPI monitors. I am using 4K resolution with 200% of fractional scaling. -- Best Regards, Mike Gavrilov.
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