Re: resend: pci: automatic interrupt affinity for MSI/MSI-X capable devices V2

From: Bjorn Helgaas
Date: Thu Jul 21 2016 - 17:02:32 EST


Hi Christoph,

This thread looks like it might be a typo. It doesn't use any of the
new PCI MSI stuff. Looks like the cover letter from the PCI MSI
patches, but the actual patches are from a different series?

On Thu, Jul 21, 2016 at 04:30:20PM +0200, Christoph Hellwig wrote:
> This series adds a new set of functions that transparently use the right
> type of interrupt (MSI-X, MSI, legacy interrupt line) for a PCI device,
> and if multiple vectors are supported automatically spreads the irq
> routing to different CPUs. This will allow the block layer (and hopefully
> other consumers in the future) to use this information for mapping
> queues to fit the interrupt affinity.
>
> For the last patche to work you need to merge the irq/for-block branch of
>
> https://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
>
> first.
>
> There also is a git tree available at:
>
> git://git.infradead.org/users/hch/block.git pci-irq-spreading
>
> Gitweb:
>
> http://git.infradead.org/users/hch/block.git/shortlog/refs/heads/pci-irq-spreading
>
> Since the previous post of V2 I've only added the Reviewed-by: tags from
> Alexander.
>
> Changes since V1
> - change return values for the minmum vector check
> - improve the documentation
>
> Changes since automatic interrupt affinity for MSI/MSI-X capable devices V3:
> - add PCI_IRQ_NOLEGACY flag
> - various error code fixes
> - reuse the pci_enable_msi(x)_range code instead of duplicating it
> - don't allocate msix_entry structures for the MSI-X case
>
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