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Subject[PATCH-WIP 07/13] xen/arm: receive xen events on arm
Date
Compile events.c and use IRQ 32 to receive events notifications.

Signed-off-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
---
arch/arm/include/asm/xen/events.h | 9 +++++++++
drivers/xen/events.c | 36 +++++++++++++++++++++++++++++++++++-
2 files changed, 44 insertions(+), 1 deletions(-)
diff --git a/arch/arm/include/asm/xen/events.h b/arch/arm/include/asm/xen/events.h
index efa7c61..94b4e90 100644
--- a/arch/arm/include/asm/xen/events.h
+++ b/arch/arm/include/asm/xen/events.h
@@ -1,9 +1,18 @@
#ifndef _ASM_ARM_XEN_EVENTS_H
#define _ASM_ARM_XEN_EVENTS_H

+#include <asm/ptrace.h>
+
enum ipi_vector {
+ XEN_PLACEHOLDER_VECTOR,
+
/* Xen IPIs go here */
XEN_NR_IPIS,
};

+static inline int xen_irqs_disabled(struct pt_regs *regs)
+{
+ return raw_irqs_disabled_flags(regs->ARM_cpsr);
+}
+
#endif /* _ASM_ARM_XEN_EVENTS_H */
diff --git a/drivers/xen/events.c b/drivers/xen/events.c
index 6e075cd..18139ee 100644
--- a/drivers/xen/events.c
+++ b/drivers/xen/events.c
@@ -31,13 +31,15 @@
#include <linux/irqnr.h>
#include <linux/pci.h>

+#ifdef CONFIG_X86
#include <asm/desc.h>
#include <asm/ptrace.h>
#include <asm/irq.h>
#include <asm/idle.h>
#include <asm/io_apic.h>
-#include <asm/sync_bitops.h>
#include <asm/xen/pci.h>
+#endif
+#include <asm/sync_bitops.h>
#include <asm/xen/hypercall.h>
#include <asm/xen/hypervisor.h>

@@ -49,6 +51,8 @@
#include <xen/interface/event_channel.h>
#include <xen/interface/hvm/hvm_op.h>
#include <xen/interface/hvm/params.h>
+#include <xen/interface/physdev.h>
+#include <xen/interface/sched.h>

/*
* This lock protects updates to the following mapping and reference-count
@@ -801,10 +805,12 @@ EXPORT_SYMBOL_GPL(xen_pirq_from_irq);
int bind_evtchn_to_irq(unsigned int evtchn)
{
int irq;
+ struct irq_desc *desc;

mutex_lock(&irq_mapping_update_lock);

irq = evtchn_to_irq[evtchn];
+ irq_clear_status_flags(irq, IRQ_NOREQUEST);

if (irq == -1) {
irq = xen_allocate_irq_dynamic();
@@ -813,6 +819,8 @@ int bind_evtchn_to_irq(unsigned int evtchn)

irq_set_chip_and_handler_name(irq, &xen_dynamic_chip,
handle_edge_irq, "event");
+ desc = irq_to_desc(irq);
+ irq_clear_status_flags(irq, IRQ_NOREQUEST);

xen_irq_info_evtchn_init(irq, evtchn);
}
@@ -1282,7 +1290,9 @@ void xen_evtchn_do_upcall(struct pt_regs *regs)
{
struct pt_regs *old_regs = set_irq_regs(regs);

+#ifdef CONFIG_X86
exit_idle();
+#endif
irq_enter();

__xen_evtchn_do_upcall();
@@ -1707,6 +1717,7 @@ void __init xen_init_IRQ(void)
for (i = 0; i < NR_EVENT_CHANNELS; i++)
mask_evtchn(i);

+#ifdef CONFIG_X86
if (xen_hvm_domain()) {
xen_callback_vector();
native_init_IRQ();
@@ -1718,4 +1729,27 @@ void __init xen_init_IRQ(void)
if (xen_initial_domain())
pci_xen_initial_domain();
}
+#endif
}
+#ifdef CONFIG_ARM
+#define IRQ_EVTCHN_CALLBACK 63
+irqreturn_t xen_arm_callback(int irq, void *arg)
+{
+ __xen_evtchn_do_upcall();
+ return 0;
+}
+
+int __init xen_init_IRQ_arm(void)
+{
+ int rc;
+ xen_init_IRQ();
+ rc = request_irq(IRQ_EVTCHN_CALLBACK, xen_arm_callback,
+ IRQF_DISABLED | IRQF_NOBALANCING | IRQF_TRIGGER_RISING,
+ "events", "events");
+ if (rc) {
+ printk(KERN_ERR "Error requesting IRQ %d\n", IRQ_EVTCHN_CALLBACK);
+ }
+ return rc;
+}
+core_initcall(xen_init_IRQ_arm);
+#endif
--
1.7.2.5


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