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xen: implement xen_hvm_register_pirq

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xen_hvm_register_pirq allows the kernel to map a GSI into a Xen pirq and
receive the interrupt as an event channel from that point on.

Signed-off-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
Reviewed-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
This commit is contained in:
Stefano Stabellini
2010-06-24 16:42:04 +01:00
parent 01557baff6
commit 42a1de56f3
3 changed files with 71 additions and 1 deletions
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38
arch/x86/pci/xen.c
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@@ -17,6 +17,44 @@
#include <xen/events.h>
#include <asm/xen/pci.h>
#ifdef CONFIG_ACPI
static int xen_hvm_register_pirq(u32 gsi, int triggering)
{
int rc, irq;
struct physdev_map_pirq map_irq;
int shareable = 0;
char *name;
if (!xen_hvm_domain())
return -1;
map_irq.domid = DOMID_SELF;
map_irq.type = MAP_PIRQ_TYPE_GSI;
map_irq.index = gsi;
map_irq.pirq = -1;
rc = HYPERVISOR_physdev_op(PHYSDEVOP_map_pirq, &map_irq);
if (rc) {
printk(KERN_WARNING "xen map irq failed %d\n", rc);
return -1;
}
if (triggering == ACPI_EDGE_SENSITIVE) {
shareable = 0;
name = "ioapic-edge";
} else {
shareable = 1;
name = "ioapic-level";
}
irq = xen_map_pirq_gsi(map_irq.pirq, gsi, shareable, name);
printk(KERN_DEBUG "xen: --> irq=%d, pirq=%d\n", irq, map_irq.pirq);
return irq;
}
#endif
#if defined(CONFIG_PCI_MSI)
#include <linux/msi.h>