linux-toradex.git/drivers/virtio, branch v2.6.31.10

virtio: order used ring after used index read

2009-11-10T00:22:28+00:00

commit 2d61ba95034f1abbdec7729d52c740870a5eddb6 upstream.

On SMP guests, reads from the ring might bypass used index reads. This
causes guest crashes because host writes to used index to signal ring
data readiness.  Fix this by inserting rmb before used ring reads.

Signed-off-by: Michael S. Tsirkin 
Signed-off-by: Rusty Russell 
Signed-off-by: Greg Kroah-Hartman

virtio: refactor find_vqs

2009-07-30T06:33:45+00:00

This refactors find_vqs, making it more readable and robust, and fixing
two regressions from 2.6.30:
- double free_irq causing BUG_ON on device removal
- probe failure when vq can't be assigned to msi-x vector
  (reported on old host kernels)

Tested-by: Amit Shah 
Signed-off-by: Michael S. Tsirkin 
Signed-off-by: Rusty Russell

virtio: delete vq from list

2009-07-30T06:33:44+00:00

This makes delete vq the reverse of find vq.
This is required to make it possible to retry find_vqs
after a failure, otherwise the list gets corrupted.

Signed-off-by: Michael S. Tsirkin 
Signed-off-by: Rusty Russell

virtio: fix memory leak on device removal

2009-07-30T06:33:44+00:00

Make vp_free_vectors do the reverse of vq_request_vectors.

Signed-off-by: Michael S. Tsirkin 
Signed-off-by: Rusty Russell

virtio-pci: correctly unregister root device on error

2009-07-17T12:17:47+00:00

If pci_register_driver() fails we're incorrectly unregistering the root
device with device_unregister() rather than root_device_unregister().

Reported-by: Don Zickus 
Signed-off-by: Mark McLoughlin 
Signed-off-by: Rusty Russell

virtio: enhance id_matching for virtio drivers

2009-06-12T12:46:40+00:00

This patch allows a virtio driver to use VIRTIO_DEV_ANY_ID for the
device id. This will be used by a test module that can be bound to
any virtio device.

Signed-off-by: Christian Borntraeger 
Signed-off-by: Rusty Russell

virtio: fix id_matching for virtio drivers

2009-06-12T12:46:40+00:00

This bug never appeared, since all current virtio drivers use
VIRTIO_DEV_ANY_ID for the vendor field. If a real vendor would be used,
the check in virtio_id_match is wrong - it returns 0 if
id->vendor == dev->id.vendor.

Signed-off-by: Christian Borntraeger 
Signed-off-by: Rusty Russell

virtio: indirect ring entries (VIRTIO_RING_F_INDIRECT_DESC)

2009-06-12T12:46:39+00:00

Add a new feature flag for indirect ring entries. These are ring
entries which point to a table of buffer descriptors.

The idea here is to increase the ring capacity by allowing a larger
effective ring size whereby the ring size dictates the number of
requests that may be outstanding, rather than the size of those
requests.

This should be most effective in the case of block I/O where we can
potentially benefit by concurrently dispatching a large number of
large requests. Even in the simple case of single segment block
requests, this results in a threefold increase in ring capacity.

Signed-off-by: Mark McLoughlin 
Signed-off-by: Rusty Russell

virtio: expose features in sysfs

2009-06-12T12:46:38+00:00

Each device negotiates feature bits; expose these in sysfs to help
diagnostics and debugging.

Signed-off-by: Rusty Russell

virtio_pci: optional MSI-X support

2009-06-12T12:46:37+00:00

This implements optional MSI-X support in virtio_pci.
MSI-X is used whenever the host supports at least 2 MSI-X
vectors: 1 for configuration changes and 1 for virtqueues.
Per-virtqueue vectors are allocated if enough vectors
available.

Signed-off-by: Michael S. Tsirkin 
Acked-by: Anthony Liguori 
Signed-off-by: Rusty Russell  (+ whitespace, style)