diff options
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/xen/events.c | 60 |
1 files changed, 60 insertions, 0 deletions
diff --git a/drivers/xen/events.c b/drivers/xen/events.c index c649ac0..a7d9555 100644 --- a/drivers/xen/events.c +++ b/drivers/xen/events.c @@ -29,6 +29,7 @@ #include <linux/bootmem.h> #include <linux/slab.h> #include <linux/irqnr.h> +#include <linux/pci.h> #include <asm/desc.h> #include <asm/ptrace.h> @@ -656,6 +657,10 @@ out: return irq; } +#ifdef CONFIG_PCI_MSI +#include <linux/msi.h> +#include "../pci/msi.h" + void xen_allocate_pirq_msi(char *name, int *irq, int *pirq) { spin_lock(&irq_mapping_update_lock); @@ -678,6 +683,61 @@ out: spin_unlock(&irq_mapping_update_lock); } +int xen_create_msi_irq(struct pci_dev *dev, struct msi_desc *msidesc, int type) +{ + int irq = -1; + 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); + + irq_free_desc(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; |