Package: src:linux Version: 6.12.35-1 Severity: normal Tags: patch X-Debbugs-Cc: debian-arm@lists.debian.org, debian-powerpc@lists.debian.org, sjr@debian.org User: debian-arm@lists.debian.org Usertags: arm64 User: debian-powerpc@lists.debian.org Usertags: ppc64el Hi, this is a set of backported patches to make the Xe driver in the stable kernel not Oops when run on a machine with a page size that isn't 4k. This is most likely relevant on arm64 (16k) and ppc64el (64k). These should not cause any code changes when compiling with 4k page sizes, as they just replace a bunch of PAGE_SIZE with an appropriate definition that evaluates to 4096. Simon
Control: tags -1 moreinfo I see that patches on stable@, we won't take patches that can go this way usually. Bastian
Hi,
The full patchset[1] for later kernels has a bunch of extra changes, but
the stable kernel is old enough that we can get by with a number of
simple substitutions:
- replace SZ_4K with PAGE_SIZE when finding an alignment palatable to
the CPU
- replace PAGE_SIZE with SZ_4K when describing a memory layout in GPU
memory that uses 4k alignment regardless of host page size.
So on 4k, where PAGE_SIZE *is* SZ_4K, this does nothing, but it fixes
the Oops on boot for 16k (aarch64, loong64) and 64k (ppc64le) users.
Since these are derived from the proper fix, you can easily see when
they are no longer required.
Simon
[1]
https://lore.kernel.org/all/20250604-upstream-xe-non-4k-v2-v2-0-ce7905da7b08@aosc.io/
Control: Forwarded -1 https://lore.kernel.org/all/20250723074540.2660-1-Simon.Richter@hogyros.de/ You could've mentioned that ...
Hi,
They're not my fixes, all I did upstream was retrigger CI because it
showed a conflict.
But yes, these patches are already queued upstream (although they are
larger there, because some of the places near the "FIXME" actually got
fixed in the meantime). Sorry for not making that clear.
Simon
I don't see them in drm-misc. Once the corresponding patches are applied upstream, please send the backported patches here with proper headers: - "Bug-Debian" header pointing to this bug report - "Origin" header pointing to the source of the backport (Git forge or mail archive) - Include the upstream commit messages and commit hashes in the commit meesage, in addition to the current notes about backporting Ben.
This driver, for the time being, assumes that the kernel page size is 4kB, so it fails on loong64 and aarch64 with 16kB pages, and ppc64el with 64kB pages. --- drivers/gpu/drm/xe/Kconfig | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/gpu/drm/xe/Kconfig b/drivers/gpu/drm/xe/Kconfig index 2bb2bc052120..7c9f1de7b35f 100644 --- a/drivers/gpu/drm/xe/Kconfig +++ b/drivers/gpu/drm/xe/Kconfig @@ -1,7 +1,7 @@ # SPDX-License-Identifier: GPL-2.0-only config DRM_XE tristate "Intel Xe2 Graphics" - depends on DRM && PCI + depends on DRM && PCI && (PAGE_SIZE_4KB || BROKEN) depends on KUNIT || !KUNIT depends on INTEL_VSEC || !INTEL_VSEC depends on X86_PLATFORM_DEVICES || !(X86 && ACPI)
Hi, until either of - https://patchwork.freedesktop.org/series/150230/ or the (same but rebased) - https://patchwork.freedesktop.org/series/151983/ goes in, the xe module will Oops on insmod when kernel page size is not 4kB. This disables the module for the time being, and should be reverted for fixed versions. This should probably also be added to the stable kernel series which will likely not receive the fix. Simon Richter (1): Mark xe driver as BROKEN if kernel page size is not 4kB drivers/gpu/drm/xe/Kconfig | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
<formletter> This is not the correct way to submit patches for inclusion in the stable kernel tree. Please read: https://www.kernel.org/doc/html/latest/process/stable-kernel-rules.html for how to do this properly. </formletter>
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