xen: remap GSIs as pirqs when running as initial domain
Implement xen_register_gsi to setup the correct triggering and polarity
properties of a gsi.
Implement xen_register_pirq to register a particular gsi as pirq and
receive interrupts as events.
Call xen_setup_pirqs to register all the legacy ISA irqs as pirqs.
Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
Signed-off-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
Reviewed-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
diff --git a/arch/x86/pci/xen.c b/arch/x86/pci/xen.c
index b5bd642..dd0b5fd 100644
--- a/arch/x86/pci/xen.c
+++ b/arch/x86/pci/xen.c
@@ -257,3 +257,138 @@
#endif
return 0;
}
+
+#ifdef CONFIG_XEN_DOM0
+static int xen_register_pirq(u32 gsi, int triggering)
+{
+ int rc, irq;
+ struct physdev_map_pirq map_irq;
+ int shareable = 0;
+ char *name;
+
+ if (!xen_pv_domain())
+ return -1;
+
+ if (triggering == ACPI_EDGE_SENSITIVE) {
+ shareable = 0;
+ name = "ioapic-edge";
+ } else {
+ shareable = 1;
+ name = "ioapic-level";
+ }
+
+ irq = xen_allocate_pirq(gsi, shareable, name);
+
+ printk(KERN_DEBUG "xen: --> irq=%d\n", irq);
+
+ if (irq < 0)
+ goto out;
+
+ map_irq.domid = DOMID_SELF;
+ map_irq.type = MAP_PIRQ_TYPE_GSI;
+ map_irq.index = gsi;
+ map_irq.pirq = irq;
+
+ rc = HYPERVISOR_physdev_op(PHYSDEVOP_map_pirq, &map_irq);
+ if (rc) {
+ printk(KERN_WARNING "xen map irq failed %d\n", rc);
+ return -1;
+ }
+
+out:
+ return irq;
+}
+
+static int xen_register_gsi(u32 gsi, int triggering, int polarity)
+{
+ int rc, irq;
+ struct physdev_setup_gsi setup_gsi;
+
+ if (!xen_pv_domain())
+ return -1;
+
+ printk(KERN_DEBUG "xen: registering gsi %u triggering %d polarity %d\n",
+ gsi, triggering, polarity);
+
+ irq = xen_register_pirq(gsi, triggering);
+
+ setup_gsi.gsi = gsi;
+ setup_gsi.triggering = (triggering == ACPI_EDGE_SENSITIVE ? 0 : 1);
+ setup_gsi.polarity = (polarity == ACPI_ACTIVE_HIGH ? 0 : 1);
+
+ rc = HYPERVISOR_physdev_op(PHYSDEVOP_setup_gsi, &setup_gsi);
+ if (rc == -EEXIST)
+ printk(KERN_INFO "Already setup the GSI :%d\n", gsi);
+ else if (rc) {
+ printk(KERN_ERR "Failed to setup GSI :%d, err_code:%d\n",
+ gsi, rc);
+ }
+
+ return irq;
+}
+
+static __init void xen_setup_acpi_sci(void)
+{
+ int rc;
+ int trigger, polarity;
+ int gsi = acpi_sci_override_gsi;
+
+ if (!gsi)
+ return;
+
+ rc = acpi_get_override_irq(gsi, &trigger, &polarity);
+ if (rc) {
+ printk(KERN_WARNING "xen: acpi_get_override_irq failed for acpi"
+ " sci, rc=%d\n", rc);
+ return;
+ }
+ trigger = trigger ? ACPI_LEVEL_SENSITIVE : ACPI_EDGE_SENSITIVE;
+ polarity = polarity ? ACPI_ACTIVE_LOW : ACPI_ACTIVE_HIGH;
+
+ printk(KERN_INFO "xen: sci override: global_irq=%d trigger=%d "
+ "polarity=%d\n", gsi, trigger, polarity);
+
+ gsi = xen_register_gsi(gsi, trigger, polarity);
+ printk(KERN_INFO "xen: acpi sci %d\n", gsi);
+
+ return;
+}
+
+static int acpi_register_gsi_xen(struct device *dev, u32 gsi,
+ int trigger, int polarity)
+{
+ return xen_register_gsi(gsi, trigger, polarity);
+}
+
+static int __init pci_xen_initial_domain(void)
+{
+ xen_setup_acpi_sci();
+ __acpi_register_gsi = acpi_register_gsi_xen;
+
+ return 0;
+}
+
+void __init xen_setup_pirqs(void)
+{
+ int irq;
+
+ pci_xen_initial_domain();
+
+ if (0 == nr_ioapics) {
+ for (irq = 0; irq < NR_IRQS_LEGACY; irq++)
+ xen_allocate_pirq(irq, 0, "xt-pic");
+ return;
+ }
+
+ /* Pre-allocate legacy irqs */
+ for (irq = 0; irq < NR_IRQS_LEGACY; irq++) {
+ int trigger, polarity;
+
+ if (acpi_get_override_irq(irq, &trigger, &polarity) == -1)
+ continue;
+
+ xen_register_pirq(irq,
+ trigger ? ACPI_LEVEL_SENSITIVE : ACPI_EDGE_SENSITIVE);
+ }
+}
+#endif