On Sat, Aug 14, 2021 at 12:26:50AM +1200, Barry Song wrote: > From: Barry Song <song.bao.hua@xxxxxxxxxxxxx> > > /sys/bus/pci/devices/.../irq has been there for many years but it has never > been documented. This patch is trying to document it. Plus, irq ABI is very > confusing at this moment especially for MSI and MSI-x cases. MSI sets irq > to the first number in the vector, but MSI-X does nothing for this though > it saves default_irq in msix_setup_entries(). Weird the saved default_irq > for MSI-X is never used in pci_msix_shutdown(), which is quite different > with pci_msi_shutdown(). Thus, this patch also moves to show the first IRQ > number which is from the first msi_entry for MSI-X. Hopefully, this can > make irq ABI more clear and more consistent. > > Signed-off-by: Barry Song <song.bao.hua@xxxxxxxxxxxxx> > --- > Documentation/ABI/testing/sysfs-bus-pci | 8 ++++++++ > drivers/pci/msi.c | 6 ++++++ > 2 files changed, 14 insertions(+) Acked-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
