PCI MSI: Add support for multiple MSI

Add the new API pci_enable_msi_block() to allow drivers to
request multiple MSI and reimplement pci_enable_msi in terms of
pci_enable_msi_block.  Ensure that the architecture back ends don't
have to know about multiple MSI.

Signed-off-by: Matthew Wilcox <willy@linux.intel.com>
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>

1 files changed, 1 insertions, 0 deletions

diff --git a/include/linux/msi.h b/include/linux/msi.h
index 37c1bbe546e5..6991ab5b24d1 100644
--- a/include/linux/msi.h
+++ b/include/linux/msi.h
@@ -21,6 +21,7 @@ extern void write_msi_msg(unsigned int irq, struct msi_msg *msg);
 struct msi_desc {
         struct {
                 __u8    is_msix : 1;
+                __u8    multiple: 3;    /* log2 number of messages */
                 __u8    maskbit : 1;    /* mask-pending bit supported ?   */
                 __u8    is_64   : 1;    /* Address size: 0=32bit 1=64bit  */
                 __u8    pos;            /* Location of the msi capability */