[PATCH V2 5/6] virtio: add one field into virtio_device for recording if device uses managed irq

[Thomas Gleixner]

On Tue, Jul 06 2021 at 07:42, Christoph Hellwig wrote:
> On Fri, Jul 02, 2021 at 11:05:54PM +0800, Ming Lei wrote:
>> blk-mq needs to know if the device uses managed irq, so add one field
>> to virtio_device for recording if device uses managed irq.
>> 
>> If the driver use managed irq, this flag has to be set so it can be
>> passed to blk-mq.
>
> I don't think all this boilerplate code make a whole lot of sense.
> I think we need to record this information deep down in the irq code by
> setting a flag in struct device only if pci_alloc_irq_vectors_affinity
> atually managed to allocate multiple vectors and the PCI_IRQ_AFFINITY
> flag was set.  Then blk-mq can look at that flag, and also check that
> more than one queue is in used and work based on that.

Ack.