#include <linux/module.h>
#include <linux/kthread.h>
#include <linux/pagemap.h>
#include <linux/init.h>
#include <xen/xen.h>
#include <xen/page.h>
#include <asm/xen/hypervisor.h>
#include <xen/features.h>
#include <xen/events.h>

MODULE_AUTHOR("Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>");
MODULE_DESCRIPTION("alloc_and_unmap");
MODULE_LICENSE("GPL");
MODULE_VERSION("0.1");

static int do_it(void)
{
	int rc;
	struct physdev_get_free_pirq op_get_free_pirq;
	struct physdev_unmap_pirq unmap_irq;
	int pirq;

	op_get_free_pirq.type = MAP_PIRQ_TYPE_MSI;
 	rc = HYPERVISOR_physdev_op(PHYSDEVOP_get_free_pirq, &op_get_free_pirq);
	if (rc) {
		printk(KERN_WARNING "%s:%d rc:%d\n", __func__, __LINE__, rc);
		return rc;
	}
	pirq = op_get_free_pirq.pirq;
	unmap_irq.pirq = pirq;
	unmap_irq.domid = DOMID_SELF;
	rc = HYPERVISOR_physdev_op(PHYSDEVOP_unmap_pirq, &unmap_irq);
	if (rc) {
		printk(KERN_WARNING "unmap irq failed %d\n", rc);
		return rc;
	}
	printk("PIRQ: %d\n", pirq);
	return 0;
}
static int __init alloc_and_unmap_init(void)
{
	int i;

	for (i = 0; i < 10; i++)
		if (do_it())
			break;
	return 0;
}
static void __exit alloc_and_unmap_exit(void)
{
}
module_init(alloc_and_unmap_init);
module_exit(alloc_and_unmap_exit);