xen/arm: receive Xen events on ARM
Compile events.c on ARM.
Parse, map and enable the IRQ to get event notifications from the device
tree (node "/xen").
Signed-off-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
Acked-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
diff --git a/arch/arm/xen/enlighten.c b/arch/arm/xen/enlighten.c
index 036a4d8..bad67ad 100644
--- a/arch/arm/xen/enlighten.c
+++ b/arch/arm/xen/enlighten.c
@@ -1,4 +1,5 @@
#include <xen/xen.h>
+#include <xen/events.h>
#include <xen/grant_table.h>
#include <xen/hvm.h>
#include <xen/interface/xen.h>
@@ -9,6 +10,8 @@
#include <xen/xenbus.h>
#include <asm/xen/hypervisor.h>
#include <asm/xen/hypercall.h>
+#include <linux/interrupt.h>
+#include <linux/irqreturn.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/of_irq.h>
@@ -33,6 +36,8 @@
int xen_platform_pci_unplug = XEN_UNPLUG_ALL;
EXPORT_SYMBOL_GPL(xen_platform_pci_unplug);
+static __read_mostly int xen_events_irq = -1;
+
int xen_remap_domain_mfn_range(struct vm_area_struct *vma,
unsigned long addr,
unsigned long mfn, int nr,
@@ -74,6 +79,9 @@
if (of_address_to_resource(node, GRANT_TABLE_PHYSADDR, &res))
return 0;
xen_hvm_resume_frames = res.start >> PAGE_SHIFT;
+ xen_events_irq = irq_of_parse_and_map(node, 0);
+ pr_info("Xen %s support found, events_irq=%d gnttab_frame_pfn=%lx\n",
+ version, xen_events_irq, xen_hvm_resume_frames);
xen_domain_type = XEN_HVM_DOMAIN;
xen_setup_features();
@@ -115,3 +123,28 @@
return 0;
}
core_initcall(xen_guest_init);
+
+static irqreturn_t xen_arm_callback(int irq, void *arg)
+{
+ xen_hvm_evtchn_do_upcall();
+ return IRQ_HANDLED;
+}
+
+static int __init xen_init_events(void)
+{
+ if (!xen_domain() || xen_events_irq < 0)
+ return -ENODEV;
+
+ xen_init_IRQ();
+
+ if (request_percpu_irq(xen_events_irq, xen_arm_callback,
+ "events", xen_vcpu)) {
+ pr_err("Error requesting IRQ %d\n", xen_events_irq);
+ return -EINVAL;
+ }
+
+ enable_percpu_irq(xen_events_irq, 0);
+
+ return 0;
+}
+postcore_initcall(xen_init_events);