• Alexander Gordeev's avatar
    PCI/MSI: Add pci_msix_vec_count() · ff1aa430
    Alexander Gordeev authored
    This creates an MSI-X counterpart for pci_msi_vec_count().  Device drivers
    can use this function to obtain maximum number of MSI-X interrupts the
    device supports and use that number in a subsequent call to
    pci_enable_msix().
    
    pci_msix_vec_count() supersedes pci_msix_table_size() and returns a
    negative errno if device does not support MSI-X interrupts.  After this
    update, callers must always check the returned value.
    
    The only user of pci_msix_table_size() was the PCI-Express port driver,
    which is also updated by this change.
    Signed-off-by: default avatarAlexander Gordeev <agordeev@redhat.com>
    Signed-off-by: default avatarBjorn Helgaas <bhelgaas@google.com>
    Reviewed-by: default avatarTejun Heo <tj@kernel.org>
    ff1aa430
MSI-HOWTO.txt 16.2 KB