Hi Mario, On Mon, Jul 14, 2025 at 04:21:46PM -0500, Mario Limonciello wrote: > From: Mario Limonciello <mario.limoncie...@amd.com> > > On systems with multiple GPUs there can be uncertainty which GPU is the > primary one used to drive the display at bootup. In order to disambiguate > this add a new sysfs attribute 'boot_display' that uses the output of > video_is_primary_device() to populate whether a PCI device was used for > driving the display. > > Reviewed-by: Thomas Zimmermann <tzimmerm...@suse.de> > Signed-off-by: Mario Limonciello <mario.limoncie...@amd.com> > --- > v7: > * fix lkp failure > * Add tag > v6: > * Only show for the device that is boot display > * Only create after PCI device sysfs files are initialized to ensure > that resources are ready. > v4: > * new patch > --- > Documentation/ABI/testing/sysfs-bus-pci | 8 +++++ > drivers/pci/pci-sysfs.c | 46 +++++++++++++++++++++++++ > 2 files changed, 54 insertions(+) > > diff --git a/Documentation/ABI/testing/sysfs-bus-pci > b/Documentation/ABI/testing/sysfs-bus-pci > index 69f952fffec72..8b455b1a58852 100644 > --- a/Documentation/ABI/testing/sysfs-bus-pci > +++ b/Documentation/ABI/testing/sysfs-bus-pci > @@ -612,3 +612,11 @@ Description: > > # ls doe_features > 0001:01 0001:02 doe_discovery > + > +What: /sys/bus/pci/devices/.../boot_display > +Date: October 2025 > +Contact: Linux PCI developers <linux-...@vger.kernel.org> > +Description: > + This file indicates the device was used as a boot > + display. If the device was used as the boot display, the file > + will be present and contain "1".
It would probably be a good idea to define what a "boot display" here is. I get what you mean, but it's pretty vague and could easily be misunderstood. Maxime
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