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Commit 0ec53ecf authored by Stefano Stabellini's avatar Stefano Stabellini
Browse files

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: default avatarStefano Stabellini <stefano.stabellini@eu.citrix.com>
Acked-by: default avatarKonrad Rzeszutek Wilk <konrad.wilk@oracle.com>
parent b3b52fd8

arch/arm/include/asm/xen/events.h

0 → 100644
+18 −0
Original line number Diff line number Diff line 
#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 */

arch/arm/xen/enlighten.c

+33 −0
Original line number Diff line number Diff line 
#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);

arch/x86/xen/enlighten.c

+1 −0
Original line number Diff line number Diff line
@@ -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>

arch/x86/xen/irq.c

+1 −0
Original line number Diff line number Diff line
@@ -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>

arch/x86/xen/xen-ops.h

+0 −1
Original line number Diff line number Diff line
@@ -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);