1PCI_ALLOC_IRQ_VECTOR(9)       Hardware Interfaces      PCI_ALLOC_IRQ_VECTOR(9)
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NAME

6       pci_alloc_irq_vectors_affinity - allocate multiple IRQs for a device
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SYNOPSIS

9       int pci_alloc_irq_vectors_affinity(struct pci_dev * dev,
10                                          unsigned int min_vecs,
11                                          unsigned int max_vecs,
12                                          unsigned int flags,
13                                          const struct irq_affinity * affd);
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ARGUMENTS

16       dev
17           PCI device to operate on
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19       min_vecs
20           minimum number of vectors required (must be >= 1)
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22       max_vecs
23           maximum (desired) number of vectors
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25       flags
26           flags or quirks for the allocation
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28       affd
29           optional description of the affinity requirements
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DESCRIPTION

32       Allocate up to max_vecs interrupt vectors for dev, using MSI-X or MSI
33       vectors if available, and fall back to a single legacy vector if
34       neither is available. Return the number of vectors allocated, (which
35       might be smaller than max_vecs) if successful, or a negative error code
36       on error. If less than min_vecs interrupt vectors are available for dev
37       the function will fail with -ENOSPC.
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39       To get the Linux IRQ number used for a vector that can be passed to
40       request_irq use the pci_irq_vector helper.
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43Kernel Hackers Manual 3.10         June 2019           PCI_ALLOC_IRQ_VECTOR(9)
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