git: e048d38a31 - main - Status/2025Q2/drm-drivers.adoc: Add report

The branch main has been updated by salvadore:

URL: https://cgit.FreeBSD.org/doc/commit/?id=e048d38a31d876e74264bf013b2db230f2618891

commit e048d38a31d876e74264bf013b2db230f2618891
Author:     Jean-Sébastien Pédron <[email protected]>
AuthorDate: 2025-06-29 17:54:52 +0000
Commit:     Lorenzo Salvadore <[email protected]>
CommitDate: 2025-07-05 13:45:01 +0000

    Status/2025Q2/drm-drivers.adoc: Add report
    
    Reviewed by:    status (Pau Amma <[email protected]>)
    Pull Request:   https://github.com/freebsd/freebsd-doc/pull/519
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+=== DRM drivers
+
+Links: +
+link:https://github.com/freebsd/drm-kmod/pull/361[Update to Linux 6.9 DRM drivers] URL: link:https://github.com/freebsd/drm-kmod/pull/361[]
+
+Contact: Jean-Sébastien Pédron <[email protected]>
+
+DRM drivers are **kernel drivers for integrated and discrete GPUs**.
+They are maintained in the Linux kernel and we port them to FreeBSD.
+As of this report, we take the AMD and Intel DRM drivers only (NVIDIA FreeBSD drivers are proprietary and provided by NVIDIA themselves).
+
+We port them one Linux version at a time.
+This allows us to ship updates more often and it eases porting and debugging because we have a smaller delta compared to a bigger jump skipping several versions.
+
+This quarter, we finally merged the drivers from Linux 6.7 and 6.8 that were done during the first quarter into *drm-kmod*.
+The **porting for DRM drivers from Linux 6.9 was finished** and is now ready for review and testing;
+https://github.com/freebsd/drm-kmod/pull/361[see the pull request for instructions] if you want to try them.
+The pull request also lists all the patches needed to `linuxkpi`, the Linux drivers compatibility layer in the FreeBSD kernel.
+Several patches were already reviewed but there is still work.
+
+These updates target the FreeBSD 15-CURRENT development branch for now.
+Once kernel patches are accepted and the DRM drivers updates merged, we will evaluate if/how we can backport the kernel patches to earlier release branches (namely 14-STABLE).
+
+While waiting for review, we also started to work on two features which were unsupported on FreeBSD:
+* https://github.com/freebsd/drm-kmod/pull/357[`DMA_BUF_IOCTL_EXPORT_SYNC_FILE` and `DMA_BUF_IOCTL_IMPORT_SYNC_FILE` ioctls]
+* https://github.com/freebsd/drm-kmod/pull/358[`DRM_IOCTL_SYNCOBJ_EVENTFD` ioctl]
+
+They are apparently required to allow the use of wlroots-based Wayland compositors with the Vulkan API (see link:https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=286311[]).
+wlroots will need a patch as well because it only expects these features on Linux for now.
+
+Both pull requests as well as the patches to `linuxkpi` they rely on are ready for review and testing.
+The `linuxkpi` patches are linked in the pull requests.
+
+This work is kindly sponsored by the FreeBSD Foundation as part of the Laptop and Desktop Project.
+
+Sponsor: The FreeBSD Foundation