PCI: Provide sensible IRQ vector alloc/free routines

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Add a function to allocate and free a range of interrupt vectors, using
MSI-X, MSI or legacy vectors (in that order) based on the capabilities of
the underlying device and PCIe complex.

Additionally a new helper is provided to get the Linux IRQ number for given
device-relative vector so that the drivers don't need to allocate their own
arrays to keep track of the vectors for the multi vector MSI-X case.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Alexander Gordeev <agordeev@redhat.com>

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Christoph Hellwig 2016-07-12 18:20:17 +09:00 • committed by Bjorn Helgaas

parent 3ac020e0ca

commit aff171641d

3 changed files with 192 additions and 391 deletions

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467

Documentation/PCI/MSI-HOWTO.txt

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89

drivers/pci/msi.c

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27

include/linux/pci.h

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