-
Notifications
You must be signed in to change notification settings - Fork 0
Commit
This commit does not belong to any branch on this repository, and may belong to a fork outside of the repository.
ARM: 8256/1: driver coamba: add device binding path 'driver_override'
As already demonstrated with PCI [1] and the platform bus [2], a driver_override property in sysfs can be used to bypass the id matching of a device to a AMBA driver. This can be used by VFIO to bind to any AMBA device requested by the user. [1] http://lists-archives.com/linux-kernel/28030441-pci-introduce-new-device-binding-path-using-pci_dev-driver_override.html [2] https://www.redhat.com/archives/libvir-list/2014-April/msg00382.html Signed-off-by: Antonios Motakis <a.motakis@virtualopensystems.com> Reviewed-by: Kim Phillips <kim.phillips@freescale.com> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
- Loading branch information
Antonios Motakis
authored and
Russell King
committed
Feb 10, 2015
1 parent
8684014
commit 3cf3857
Showing
3 changed files
with
68 additions
and
0 deletions.
There are no files selected for viewing
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
Original file line number | Diff line number | Diff line change |
---|---|---|
@@ -0,0 +1,20 @@ | ||
What: /sys/bus/amba/devices/.../driver_override | ||
Date: September 2014 | ||
Contact: Antonios Motakis <a.motakis@virtualopensystems.com> | ||
Description: | ||
This file allows the driver for a device to be specified which | ||
will override standard OF, ACPI, ID table, and name matching. | ||
When specified, only a driver with a name matching the value | ||
written to driver_override will have an opportunity to bind to | ||
the device. The override is specified by writing a string to the | ||
driver_override file (echo vfio-amba > driver_override) and may | ||
be cleared with an empty string (echo > driver_override). | ||
This returns the device to standard matching rules binding. | ||
Writing to driver_override does not automatically unbind the | ||
device from its current driver or make any attempt to | ||
automatically load the specified driver. If no driver with a | ||
matching name is currently loaded in the kernel, the device will | ||
not bind to any driver. This also allows devices to opt-out of | ||
driver binding using a driver_override name such as "none". | ||
Only a single driver may be specified in the override, there is | ||
no support for parsing delimiters. |
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters