This patch series attempts to enable the use of xe DRM driver on non-4KiB kernel page platforms. This involves fixing the ttm/bo interface, as well as parts of the userspace API to make use of kernel `PAGE_SIZE' for alignment instead of the assumed `SZ_4K', it also fixes incorrect usage of `PAGE_SIZE' in the GuC and ring buffer interface code to make sure all instructions/commands were aligned to 4KiB barriers (per the Programmer's Manual for the GPUs covered by this DRM driver).
This issue was first discovered and reported by members of the LoongArch user communities, whose hardware commonly ran on 16KiB-page kernels. The patch series began on an unassuming branch of a downstream kernel tree maintained by Shang Yatsen.[^1]
It worked well but remained sparsely documented, a lot of the work done here relied on Shang Yatsen's original patch.
AOSC OS then picked it up[^2] to provide Intel Xe/Arc support for users of its LoongArch port, for which I worked extensively on. After months of positive user feedback and from encouragement from Kexy Biscuit, my colleague at the community, I decided to examine its potential for upstreaming, cross-reference kernel and Intel documentation to better document and revise this patch.
Now that this series has been tested good (for boot up, OpenGL, and playback of a standardised set of video samples[^3]... with the exception of the Intel Arc B580, which seems to segfault at intel-media-driver - iHD_drv_video.so, but strangely, hardware accelerated video playback works well with Firefox?) on the following platforms (motherboard + GPU model):
- x86-64, 4KiB kernel page: - MS-7D42 + Intel Arc A580 - LoongArch, 16KiB kernel page: - XA61200 + GUNNIR DG1 Blue Halberd (Intel DG1) - XA61200 + ASRock Arc A380 Challenger ITX OC (Intel Arc 380) - XA61200 + Intel Arc 580 - XA61200 + GUNNIR Intel Arc A750 Photon 8G OC (Intel Arc A750) - ASUS XC-LS3A6M + GUNNIR Intel Arc B580 INDEX 12G (Intel Arc B580)
On these platforms, basic functionalities tested good but the driver was unstable with occasional resets (I do suspect however, that this platform suffers from PCIe coherence issues, as instability only occurs under heavy VRAM I/O load):
- AArch64, 4KiB/64KiB kernel pages: - ERUN-FD3000 (Phytium D3000) + GUNNIR Intel Arc A750 Photon 8G OC (Intel Arc A750)
I think that this patch series is now ready for your comment and review. Please forgive me if I made any simple mistake or used wrong terminologies, but I have never worked on a patch for the DRM subsystem and my experience is still quite thin.
But anyway, just letting you all know that Intel Xe/Arc works on non-4KiB kernel page platforms (and honestly, it's great to use, especially for games and media playback)!
[^1]: https://github.com/FanFansfan/loongson-linux/tree/loongarch-xe [^2]: We maintained Shang Yatsen's patch until our v6.13.3 tree, until we decided to test and send this series upstream, https://github.com/AOSC-Tracking/linux/tree/aosc/v6.13.3 [^3]: Delicious hot pot! https://repo.aosc.io/ahvl/sample-videos-20250223.tar.zst
Suggested-by: Kexy Biscuit kexybiscuit@aosc.io Co-developed-by: Shang Yatsen 429839446@qq.com Signed-off-by: Shang Yatsen 429839446@qq.com Signed-off-by: Mingcong Bai jeffbai@aosc.io --- Mingcong Bai (5): drm/xe/bo: fix alignment with non-4K kernel page sizes drm/xe/guc: use SZ_4K for alignment drm/xe/regs: fix RING_CTL_SIZE(size) calculation drm/xe: use 4K alignment for cursor jumps drm/xe/query: use PAGE_SIZE as the minimum page alignment
drivers/gpu/drm/xe/regs/xe_engine_regs.h | 3 +-- drivers/gpu/drm/xe/xe_bo.c | 8 ++++---- drivers/gpu/drm/xe/xe_guc.c | 4 ++-- drivers/gpu/drm/xe/xe_guc_ads.c | 32 ++++++++++++++++---------------- drivers/gpu/drm/xe/xe_guc_capture.c | 8 ++++---- drivers/gpu/drm/xe/xe_guc_ct.c | 2 +- drivers/gpu/drm/xe/xe_guc_log.c | 4 ++-- drivers/gpu/drm/xe/xe_guc_pc.c | 4 ++-- drivers/gpu/drm/xe/xe_migrate.c | 4 ++-- drivers/gpu/drm/xe/xe_query.c | 2 +- include/uapi/drm/xe_drm.h | 2 +- 11 files changed, 36 insertions(+), 37 deletions(-) --- base-commit: d082ecbc71e9e0bf49883ee4afd435a77a5101b6 change-id: 20250226-xe-non-4k-fix-6b2eded0a564
Best regards,