mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-10-01 06:33:07 +00:00
539fec78ed
`driver_override` allows to control which of the vDPA bus drivers
binds to a vDPA device.
If `driver_override` is not set, the previous behaviour is followed:
devices use the first vDPA bus driver loaded (unless auto binding
is disabled).
Tested on Fedora 34 with driverctl(8):
$ modprobe virtio-vdpa
$ modprobe vhost-vdpa
$ modprobe vdpa-sim-net
$ vdpa dev add mgmtdev vdpasim_net name dev1
# dev1 is attached to the first vDPA bus driver loaded
$ driverctl -b vdpa list-devices
dev1 virtio_vdpa
$ driverctl -b vdpa set-override dev1 vhost_vdpa
$ driverctl -b vdpa list-devices
dev1 vhost_vdpa [*]
Note: driverctl(8) integrates with udev so the binding is
preserved.
Suggested-by: Jason Wang <jasowang@redhat.com>
Acked-by: Jason Wang <jasowang@redhat.com>
Signed-off-by: Stefano Garzarella <sgarzare@redhat.com>
Link: https://lore.kernel.org/r/20211126164753.181829-3-sgarzare@redhat.com
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
57 lines
2.3 KiB
Text
57 lines
2.3 KiB
Text
What: /sys/bus/vdpa/driver_autoprobe
|
|
Date: March 2020
|
|
Contact: virtualization@lists.linux-foundation.org
|
|
Description:
|
|
This file determines whether new devices are immediately bound
|
|
to a driver after the creation. It initially contains 1, which
|
|
means the kernel automatically binds devices to a compatible
|
|
driver immediately after they are created.
|
|
|
|
Writing "0" to this file disable this feature, any other string
|
|
enable it.
|
|
|
|
What: /sys/bus/vdpa/driver_probe
|
|
Date: March 2020
|
|
Contact: virtualization@lists.linux-foundation.org
|
|
Description:
|
|
Writing a device name to this file will cause the kernel binds
|
|
devices to a compatible driver.
|
|
|
|
This can be useful when /sys/bus/vdpa/driver_autoprobe is
|
|
disabled.
|
|
|
|
What: /sys/bus/vdpa/drivers/.../bind
|
|
Date: March 2020
|
|
Contact: virtualization@lists.linux-foundation.org
|
|
Description:
|
|
Writing a device name to this file will cause the driver to
|
|
attempt to bind to the device. This is useful for overriding
|
|
default bindings.
|
|
|
|
What: /sys/bus/vdpa/drivers/.../unbind
|
|
Date: March 2020
|
|
Contact: virtualization@lists.linux-foundation.org
|
|
Description:
|
|
Writing a device name to this file will cause the driver to
|
|
attempt to unbind from the device. This may be useful when
|
|
overriding default bindings.
|
|
|
|
What: /sys/bus/vdpa/devices/.../driver_override
|
|
Date: November 2021
|
|
Contact: virtualization@lists.linux-foundation.org
|
|
Description:
|
|
This file allows the driver for a device to be specified.
|
|
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 vhost-vdpa > 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.
|