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Re: [RFC PATCH] pci: add pci_irq_get_affinity_vector()

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On Tue, Nov 08, 2016 at 04:08:51PM +0100, Hannes Reinecke wrote:
> The use-case here is that one needs to feed the MSI-X index into the driver 
> command structure. While we can extract that number trivially with scsi-mq, 
> but for scsi-sq we don't have such means.

> The main impetus of this RFC is to figure out if such a function would have 
> a chance of getting upstream, or if I have to continue use cpumaps in the 
> drivers.

There should be no need for a cpumap, nor should there be any need
for a lookup.  Driver will need the vector index for some admin ops,
but it can store it in it's driver-private queue structure (e.g. take
a look at the cq_vector field in NVMe).  Drivers really should not need
this during I/O, but if for some weird reason they do that driver specific
field is trivially reachable through the hw_ctx which gets passed to
->queue_rq.

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Thread

[RFC PATCH] pci: add pci_irq_get_affinity_vector() Hannes Reinecke <hare@suse.de> - 2016-11-08 08:50 +0100
  Re: [RFC PATCH] pci: add pci_irq_get_affinity_vector() Christoph Hellwig <hch@lst.de> - 2016-11-08 16:00 +0100
    Re: [RFC PATCH] pci: add pci_irq_get_affinity_vector() Hannes Reinecke <hare@suse.de> - 2016-11-08 16:10 +0100
      Re: [RFC PATCH] pci: add pci_irq_get_affinity_vector() Christoph Hellwig <hch@lst.de> - 2016-11-08 16:20 +0100
        Re: [RFC PATCH] pci: add pci_irq_get_affinity_vector() Christoph Hellwig <hch@lst.de> - 2016-11-08 16:30 +0100
        Re: [RFC PATCH] pci: add pci_irq_get_affinity_vector() Hannes Reinecke <hare@suse.de> - 2016-11-08 16:30 +0100
  Re: [RFC PATCH] pci: add pci_irq_get_affinity_vector() Thomas Gleixner <tglx@linutronix.de> - 2016-11-08 16:00 +0100

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