This patch adds an "enable" sysfs attribute to each PCI device. When read it
shows the "enabled-ness" of the device, but you can write a "0" into it to
disable a device, and a "1" to enable it.
This later is needed for X and other cases where userspace wants to enable
the BARs on a device (typical example: to run the video bios on a secundary
head). Right now X does all this "by hand" via bitbanging, that's just evil.
This allows X to no longer do that but to just let the kernel do this.
Signed-off-by: Arjan van de Ven <[email protected]>
CC: Peter Jones <[email protected]>
CC: Dave Airlie <[email protected]>
ACK
This would allow me to remove the issue in X where loading the DRM at X
startup acts differently than loading the DRM before X runs, due to Xs PCI
probe running in-between... with this I can just enable all VGA devices
and no worry whether they have a DRM or not..
Dave.
--
David Airlie, Software Engineer
http://www.skynet.ie/~airlied / airlied at skynet.ie
Linux kernel - DRI, VAX / pam_smb / ILUG
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