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PCI: Spread interrupt vectors in pci_alloc_irq_vectors()

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Set the affinity_mask in the PCI device before allocating vectors so that
the affinity can be propagated through the MSI descriptor structures to the
core IRQ code.  To facilitate this, new __pci_enable_msi_range() and
__pci_enable_msix_range() helpers are factored out of their not prefixed
variants which assigning the new IRQ affinity mask in the PCI device so
that the low-level interrupt code can perform the interrupt affinity
assignment and do node-local allocations.

A new PCI_IRQ_NOAFFINITY flag is added to pci_alloc_irq_vectors() so that
this function can also be used by drivers that don't wish to use the
automatic affinity assignment.

[bhelgaas: omit "else" after "return" consistently]
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Alexander Gordeev <agordeev@redhat.com>
This commit is contained in:
Christoph Hellwig 2016-07-12 18:20:18 +09:00 • committed by Bjorn Helgaas
parent aff171641d
commit 4ef33685aa
3 changed files with 96 additions and 46 deletions
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2
include/linux/pci.h
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@ -320,6 +320,7 @@ struct pci_dev {
* directly, use the values stored here. They might be different!
*/
unsigned int irq;
struct cpumask *irq_affinity;
struct resource resource[DEVICE_COUNT_RESOURCE]; /* I/O and memory regions + expansion ROMs */
bool match_driver; /* Skip attaching driver */
@ -1240,6 +1241,7 @@ int pci_set_vga_state(struct pci_dev *pdev, bool decode,
#define PCI_IRQ_NOLEGACY (1 << 0) /* don't use legacy interrupts */
#define PCI_IRQ_NOMSI (1 << 1) /* don't use MSI interrupts */
#define PCI_IRQ_NOMSIX (1 << 2) /* don't use MSI-X interrupts */
#define PCI_IRQ_NOAFFINITY (1 << 3) /* don't auto-assign affinity */
/* kmem_cache style wrapper around pci_alloc_consistent() */