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virtio: allow drivers to request IRQ affinity when creating VQs

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Add a struct irq_affinity pointer to the find_vqs methods, which if set
is used to tell the PCI layer to create the MSI-X vectors for our I/O
virtqueues with the proper affinity from the start.  Compared to after
the fact affinity hints this gives us an instantly working setup and
allows to allocate the irq descritors node-local and avoid interconnect
traffic.  Last but not least this will allow blk-mq queues are created
based on the interrupt affinity for storage drivers.

Signed-off-by: Christoph Hellwig <[email protected]>
Reviewed-by: Jason Wang <[email protected]>
Signed-off-by: Michael S. Tsirkin <[email protected]>
This commit is contained in:
Christoph Hellwig 2017-02-05 18:15:22 +01:00 • committed by Michael S. Tsirkin
commit fb5e31d970
20 changed files with 48 additions and 34 deletions
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3
drivers/remoteproc/remoteproc_virtio.c
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@ -137,7 +137,8 @@ static void rproc_virtio_del_vqs(struct virtio_device *vdev)
static int rproc_virtio_find_vqs(struct virtio_device *vdev, unsigned int nvqs,
struct virtqueue *vqs[],
vq_callback_t *callbacks[],
const char * const names[])
const char * const names[],
struct irq_affinity *desc)
{
int i, ret;