> +int xen_create_msi_irq(struct pci_dev *dev, struct msi_desc *msidesc, int
> type)
> +{
> + int irq = 0;
Lets make the default one -1, as that is the value we
are checking for errors later on.
> + struct physdev_map_pirq map_irq;
> + int rc;
> + int pos;
> + u32 table_offset, bir;
> +
> + memset(&map_irq, 0, sizeof(map_irq));
> + map_irq.domid = DOMID_SELF;
> + map_irq.type = MAP_PIRQ_TYPE_MSI;
> + map_irq.index = -1;
> + map_irq.pirq = -1;
> + map_irq.bus = dev->bus->number;
> + map_irq.devfn = dev->devfn;
> +
> + if (type == PCI_CAP_ID_MSIX) {
> + pos = pci_find_capability(dev, PCI_CAP_ID_MSIX);
> +
> + pci_read_config_dword(dev, msix_table_offset_reg(pos),
> + &table_offset);
> + bir = (u8)(table_offset & PCI_MSIX_FLAGS_BIRMASK);
> +
> + map_irq.table_base = pci_resource_start(dev, bir);
> + map_irq.entry_nr = msidesc->msi_attrib.entry_nr;
> + }
> +
> + spin_lock(&irq_mapping_update_lock);
> +
> + irq = find_unbound_irq();
> +
> + if (irq == -1)
> + goto out;
> +
> + rc = HYPERVISOR_physdev_op(PHYSDEVOP_map_pirq, &map_irq);
> + if (rc) {
> + printk(KERN_WARNING "xen map irq failed %d\n", rc);
> +
> + dynamic_irq_cleanup(irq);
> +
> + irq = -1;
> + goto out;
> + }
> + irq_info[irq] = mk_pirq_info(0, map_irq.pirq, 0, map_irq.index);
> +
> + set_irq_chip_and_handler_name(irq, &xen_pirq_chip,
> + handle_level_irq,
> + (type == PCI_CAP_ID_MSIX) ? "msi-x":"msi");
> +
> +out:
> + spin_unlock(&irq_mapping_update_lock);
> + return irq;
> +}
> +#endif
> +
> int xen_destroy_irq(int irq)
> {
> struct irq_desc *desc;
> diff --git a/include/xen/events.h b/include/xen/events.h
> index 0c58db6..8fa27dc 100644
> --- a/include/xen/events.h
> +++ b/include/xen/events.h
> @@ -72,8 +72,12 @@ void xen_hvm_evtchn_do_upcall(void);
> * usual. */
> int xen_allocate_pirq(unsigned gsi, int shareable, char *name);
> int xen_map_pirq_gsi(unsigned pirq, unsigned gsi, int shareable, char *name);
> +
> +#ifdef CONFIG_PCI_MSI
> /* Allocate an irq and a pirq to be used with MSIs. */
> void xen_allocate_pirq_msi(char *name, int *irq, int *pirq);
> +int xen_create_msi_irq(struct pci_dev *dev, struct msi_desc *msidesc, int
> type);
> +#endif
>
> /* De-allocates the above mentioned physical interrupt. */
> int xen_destroy_irq(int irq);
> --
> 1.5.6.5
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