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Diffstat (limited to 'arch/x86/pci/xen.c')
-rw-r--r--arch/x86/pci/xen.c26
1 files changed, 24 insertions, 2 deletions
diff --git a/arch/x86/pci/xen.c b/arch/x86/pci/xen.c
index 8214724ce54d..fe008309ffec 100644
--- a/arch/x86/pci/xen.c
+++ b/arch/x86/pci/xen.c
@@ -333,6 +333,7 @@ static int xen_register_pirq(u32 gsi, int triggering)
struct physdev_map_pirq map_irq;
int shareable = 0;
char *name;
+ bool gsi_override = false;
if (!xen_pv_domain())
return -1;
@@ -349,11 +350,32 @@ static int xen_register_pirq(u32 gsi, int triggering)
if (pirq < 0)
goto out;
- irq = xen_bind_pirq_gsi_to_irq(gsi, pirq, shareable, name);
+ /* Before we bind the GSI to a Linux IRQ, check whether
+ * we need to override it with bus_irq (IRQ) value. Usually for
+ * IRQs below IRQ_LEGACY_IRQ this holds IRQ == GSI, as so:
+ * ACPI: INT_SRC_OVR (bus 0 bus_irq 9 global_irq 9 low level)
+ * but there are oddballs where the IRQ != GSI:
+ * ACPI: INT_SRC_OVR (bus 0 bus_irq 9 global_irq 20 low level)
+ * which ends up being: gsi_to_irq[9] == 20
+ * (which is what acpi_gsi_to_irq ends up calling when starting the
+ * the ACPI interpreter and keels over since IRQ 9 has not been
+ * setup as we had setup IRQ 20 for it).
+ */
+ if (gsi == acpi_sci_override_gsi) {
+ /* Check whether the GSI != IRQ */
+ acpi_gsi_to_irq(gsi, &irq);
+ if (irq != gsi)
+ /* Bugger, we MUST have that IRQ. */
+ gsi_override = true;
+ }
+ if (gsi_override)
+ irq = xen_bind_pirq_gsi_to_irq(irq, pirq, shareable, name);
+ else
+ irq = xen_bind_pirq_gsi_to_irq(gsi, pirq, shareable, name);
if (irq < 0)
goto out;
- printk(KERN_DEBUG "xen: --> pirq=%d -> irq=%d\n", pirq, irq);
+ printk(KERN_DEBUG "xen: --> pirq=%d -> irq=%d (gsi=%d)\n", pirq, irq, gsi);
map_irq.domid = DOMID_SELF;
map_irq.type = MAP_PIRQ_TYPE_GSI;