kernel/linux.git/drivers/virtio/virtio.c, branch v5.6.17

treewide: Add SPDX license identifier for more missed files

2019-05-21T08:50:45+00:00

Add SPDX license identifiers to all files which: - Have no license information of any form - Have MODULE_LICENCE("GPL*") inside which was used in the initial scan/conversion to ignore the file These files fall under the project license, GPL v2 only. The resulting SPDX license identifier is: GPL-2.0-only Signed-off-by: Thomas Gleixner Signed-off-by: Greg Kroah-Hartman

virtio: hint if callbacks surprisingly might sleep

2019-03-06T16:19:57+00:00

A virtio transport is free to implement some of the callbacks in virtio_config_ops in a matter that they cannot be called from atomic context (e.g. virtio-ccw, which maps a lot of the callbacks to channel I/O, which is an inherently asynchronous mechanism). This can be very surprising for developers using the much more common virtio-pci transport, just to find out that things break when used on s390. The documentation for virtio_config_ops now contains a comment explaining this, but it makes sense to add a might_sleep() annotation to various wrapper functions in the virtio core to avoid surprises later. Note that annotations are NOT added to two classes of calls: - direct calls from device drivers (all current callers should be fine, however) - calls which clearly won't be made from atomic context (such as those ultimately coming in via the driver core) Signed-off-by: Cornelia Huck Signed-off-by: Michael S. Tsirkin

virtio: split device_register into device_initialize and device_add

2018-02-01T14:26:45+00:00

In order to make caller do a simple cleanup, we split device_register into device_initialize and device_add. device_initialize always succeeds, so the caller can always use put_device when register_virtio_device faild. Signed-off-by: weiping zhang Suggested-by: Cornelia Huck Signed-off-by: Michael S. Tsirkin Reviewed-by: Cornelia Huck

virtio: release virtio index when fail to device_register

2017-12-01T14:55:32+00:00

index can be reused by other virtio device. Cc: stable@vger.kernel.org Signed-off-by: weiping zhang Reviewed-by: Cornelia Huck Signed-off-by: Michael S. Tsirkin

virtio: allow drivers to validate features

2017-04-07T13:38:59+00:00

Some drivers can't support all features in all configurations. At the moment we blindly set FEATURES_OK and later FAILED. Support this better by adding a callback drivers can use to do some early checks. Signed-off-by: Michael S. Tsirkin

virtio_net: refactor freeze/restore logic into virtnet reset logic

2017-02-07T15:05:12+00:00

For XDP we will need to reset the queues to allow for buffer headroom to be configured. In order to do this we need to essentially run the freeze()/restore() code path. Unfortunately the locking requirements between the freeze/restore and reset paths are different however so we can not simply reuse the code. This patch refactors the code path and adds a reset helper routine. Signed-off-by: John Fastabend Acked-by: Jason Wang Signed-off-by: David S. Miller

virtio: fix memory leak of virtio ida cache layers

2015-12-07T15:28:01+00:00

The virtio core uses a static ida named virtio_index_ida for assigning index numbers to virtio devices during registration. The ida core may allocate some internal idr cache layers and an ida bitmap upon any ida allocation, and all these layers are truely freed only upon the ida destruction. The virtio_index_ida is not destroyed at present, leading to a memory leak when using the virtio core as a module and atleast one virtio device is registered and unregistered. Fix this by invoking ida_destroy() in the virtio core module exit. Cc: stable@vger.kernel.org Signed-off-by: Suman Anna Signed-off-by: Michael S. Tsirkin

virtio: drop virtio_device_is_legacy_only

2015-04-15T03:11:14+00:00

virtio_device_is_legacy_only is now unused, drop it from core. Signed-off-by: Michael S. Tsirkin Reviewed-by: Cornelia Huck Signed-off-by: Rusty Russell

virtio: balloon might not be a legacy device

2015-04-15T03:11:11+00:00

We added transitional device support to balloon driver, so we don't need to black-list it in core anymore. Signed-off-by: Michael S. Tsirkin Reviewed-by: Cornelia Huck Signed-off-by: Rusty Russell

virtio: don't set VIRTIO_CONFIG_S_DRIVER_OK twice.

2015-02-17T05:49:29+00:00

I noticed this with the console device. It's not *wrong*, just a bit weird. Signed-off-by: Rusty Russell