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>
This commit is contained in:
Stefano Stabellini 2012-09-14 13:37:32 +00:00
parent b3b52fd87e
commit 0ec53ecf38
7 changed files with 69 additions and 4 deletions

View file

@ -0,0 +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 */

View file

@ -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 @@ EXPORT_SYMBOL_GPL(xen_have_vector_callback);
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 @@ static int __init xen_guest_init(void)
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 @@ static int __init xen_guest_init(void)
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);

View file

@ -33,6 +33,7 @@
#include <linux/memblock.h>
#include <xen/xen.h>
#include <xen/events.h>
#include <xen/interface/xen.h>
#include <xen/interface/version.h>
#include <xen/interface/physdev.h>

View file

@ -5,6 +5,7 @@
#include <xen/interface/xen.h>
#include <xen/interface/sched.h>
#include <xen/interface/vcpu.h>
#include <xen/events.h>
#include <asm/xen/hypercall.h>
#include <asm/xen/hypervisor.h>

View file

@ -35,7 +35,6 @@ void xen_set_pat(u64);
char * __init xen_memory_setup(void);
void __init xen_arch_setup(void);
void __init xen_init_IRQ(void);
void xen_enable_sysenter(void);
void xen_enable_syscall(void);
void xen_vcpu_restore(void);

View file

@ -31,14 +31,16 @@
#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/page.h>
#include <asm/xen/pci.h>
#endif
#include <asm/sync_bitops.h>
#include <asm/xen/hypercall.h>
#include <asm/xen/hypervisor.h>
@ -50,6 +52,9 @@
#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>
#include <asm/hw_irq.h>
/*
* This lock protects updates to the following mapping and reference-count
@ -1386,7 +1391,9 @@ 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();
@ -1795,9 +1802,9 @@ void xen_callback_vector(void)
void xen_callback_vector(void) {}
#endif
void __init xen_init_IRQ(void)
void xen_init_IRQ(void)
{
int i, rc;
int i;
evtchn_to_irq = kcalloc(NR_EVENT_CHANNELS, sizeof(*evtchn_to_irq),
GFP_KERNEL);
@ -1813,6 +1820,7 @@ void __init xen_init_IRQ(void)
pirq_needs_eoi = pirq_needs_eoi_flag;
#ifdef CONFIG_X86
if (xen_hvm_domain()) {
xen_callback_vector();
native_init_IRQ();
@ -1820,6 +1828,7 @@ void __init xen_init_IRQ(void)
* __acpi_register_gsi can point at the right function */
pci_xen_hvm_init();
} else {
int rc;
struct physdev_pirq_eoi_gmfn eoi_gmfn;
irq_ctx_init(smp_processor_id());
@ -1835,4 +1844,6 @@ void __init xen_init_IRQ(void)
} else
pirq_needs_eoi = pirq_check_eoi_map;
}
#endif
}
EXPORT_SYMBOL_GPL(xen_init_IRQ);

View file

@ -109,4 +109,6 @@ int xen_irq_from_gsi(unsigned gsi);
/* Determine whether to ignore this IRQ if it is passed to a guest. */
int xen_test_irq_shared(int irq);
/* initialize Xen IRQ subsystem */
void xen_init_IRQ(void);
#endif /* _XEN_EVENTS_H */