arch/x86/pci/xen.c - kernel/msm-4.9 - Gitiles

 /*
  * Xen PCI Frontend Stub - puts some "dummy" functions in to the Linux
  *			   x86 PCI core to support the Xen PCI Frontend
  *
  *   Author: Ryan Wilson <hap9@epoch.ncsc.mil>
  */
 #include <linux/module.h>
 #include <linux/init.h>
 #include <linux/pci.h>
 #include <linux/acpi.h>

 #include <linux/io.h>
 #include <asm/io_apic.h>
 #include <asm/pci_x86.h>

 #include <asm/xen/hypervisor.h>

 #include <xen/features.h>
 #include <xen/events.h>
 #include <asm/xen/pci.h>

 #ifdef CONFIG_ACPI
 static int acpi_register_gsi_xen_hvm(struct device *dev, u32 gsi,
 				 int trigger, int polarity)
 {
 	int rc, irq;
 	struct physdev_map_pirq map_irq;
 	int shareable = 0;
 	char *name;

 	if (!xen_hvm_domain())
 		return -1;

 	map_irq.domid = DOMID_SELF;
 	map_irq.type = MAP_PIRQ_TYPE_GSI;
 	map_irq.index = gsi;
 	map_irq.pirq = -1;

 	rc = HYPERVISOR_physdev_op(PHYSDEVOP_map_pirq, &map_irq);
 	if (rc) {
 		printk(KERN_WARNING "xen map irq failed %d\n", rc);
 		return -1;
 	}

 	if (trigger == ACPI_EDGE_SENSITIVE) {
 		shareable = 0;
 		name = "ioapic-edge";
 	} else {
 		shareable = 1;
 		name = "ioapic-level";
 	}

 	irq = xen_bind_pirq_gsi_to_irq(gsi, map_irq.pirq, shareable, name);

 	printk(KERN_DEBUG "xen: --> irq=%d, pirq=%d\n", irq, map_irq.pirq);

 	return irq;
 }
 #endif

 #if defined(CONFIG_PCI_MSI)
 #include <linux/msi.h>
 #include <asm/msidef.h>

 struct xen_pci_frontend_ops *xen_pci_frontend;
 EXPORT_SYMBOL_GPL(xen_pci_frontend);

 #define XEN_PIRQ_MSI_DATA  (MSI_DATA_TRIGGER_EDGE | \
 		MSI_DATA_LEVEL_ASSERT | (3 << 8) | MSI_DATA_VECTOR(0))

 static void xen_msi_compose_msg(struct pci_dev *pdev, unsigned int pirq,
 		struct msi_msg *msg)
 {
 	/* We set vector == 0 to tell the hypervisor we don't care about it,
 	 * but we want a pirq setup instead.
 	 * We use the dest_id field to pass the pirq that we want. */
 	msg->address_hi = MSI_ADDR_BASE_HI | MSI_ADDR_EXT_DEST_ID(pirq);
 	msg->address_lo =
 		MSI_ADDR_BASE_LO |
 		MSI_ADDR_DEST_MODE_PHYSICAL |
 		MSI_ADDR_REDIRECTION_CPU |
 		MSI_ADDR_DEST_ID(pirq);

 	msg->data = XEN_PIRQ_MSI_DATA;
 }

 static int xen_hvm_setup_msi_irqs(struct pci_dev *dev, int nvec, int type)
 {
 	int irq, pirq;
 	struct msi_desc *msidesc;
 	struct msi_msg msg;

 	list_for_each_entry(msidesc, &dev->msi_list, list) {
 		__read_msi_msg(msidesc, &msg);
 		pirq = MSI_ADDR_EXT_DEST_ID(msg.address_hi) |
 			((msg.address_lo >> MSI_ADDR_DEST_ID_SHIFT) & 0xff);
 		if (msg.data != XEN_PIRQ_MSI_DATA ||
 		    xen_irq_from_pirq(pirq) < 0) {
 			pirq = xen_allocate_pirq_msi(dev, msidesc);
 			if (pirq < 0)
 				goto error;
 			xen_msi_compose_msg(dev, pirq, &msg);
 			__write_msi_msg(msidesc, &msg);
 			dev_dbg(&dev->dev, "xen: msi bound to pirq=%d\n", pirq);
 		} else {
 			dev_dbg(&dev->dev,
 				"xen: msi already bound to pirq=%d\n", pirq);
 		}
 		irq = xen_bind_pirq_msi_to_irq(dev, msidesc, pirq, 0,
 					       (type == PCI_CAP_ID_MSIX) ?
 					       "msi-x" : "msi",
 					       DOMID_SELF);
 		if (irq < 0)
 			goto error;
 		dev_dbg(&dev->dev,
 			"xen: msi --> pirq=%d --> irq=%d\n", pirq, irq);
 	}
 	return 0;

 error:
 	dev_err(&dev->dev,
 		"Xen PCI frontend has not registered MSI/MSI-X support!\n");
 	return -ENODEV;
 }

 /*
  * For MSI interrupts we have to use drivers/xen/event.s functions to
  * allocate an irq_desc and setup the right */


 static int xen_setup_msi_irqs(struct pci_dev *dev, int nvec, int type)
 {
 	int irq, ret, i;
 	struct msi_desc *msidesc;
 	int *v;

 	v = kzalloc(sizeof(int) * max(1, nvec), GFP_KERNEL);
 	if (!v)
 		return -ENOMEM;

 	if (type == PCI_CAP_ID_MSIX)
 		ret = xen_pci_frontend_enable_msix(dev, v, nvec);
 	else
 		ret = xen_pci_frontend_enable_msi(dev, v);
 	if (ret)
 		goto error;
 	i = 0;
 	list_for_each_entry(msidesc, &dev->msi_list, list) {
 		irq = xen_bind_pirq_msi_to_irq(dev, msidesc, v[i], 0,
 					       (type == PCI_CAP_ID_MSIX) ?
 					       "pcifront-msi-x" :
 					       "pcifront-msi",
 						DOMID_SELF);
 		if (irq < 0)
 			goto free;
 		i++;
 	}
 	kfree(v);
 	return 0;

 error:
 	dev_err(&dev->dev, "Xen PCI frontend has not registered MSI/MSI-X support!\n");
 free:
 	kfree(v);
 	return ret;
 }

 static void xen_teardown_msi_irqs(struct pci_dev *dev)
 {
 	struct msi_desc *msidesc;

 	msidesc = list_entry(dev->msi_list.next, struct msi_desc, list);
 	if (msidesc->msi_attrib.is_msix)
 		xen_pci_frontend_disable_msix(dev);
 	else
 		xen_pci_frontend_disable_msi(dev);

 	/* Free the IRQ's and the msidesc using the generic code. */
 	default_teardown_msi_irqs(dev);
 }

 static void xen_teardown_msi_irq(unsigned int irq)
 {
 	xen_destroy_irq(irq);
 }

 #ifdef CONFIG_XEN_DOM0
 static int xen_initdom_setup_msi_irqs(struct pci_dev *dev, int nvec, int type)
 {
 	int ret = 0;
 	struct msi_desc *msidesc;

 	list_for_each_entry(msidesc, &dev->msi_list, list) {
 		struct physdev_map_pirq map_irq;
 		domid_t domid;

 		domid = ret = xen_find_device_domain_owner(dev);
 		/* N.B. Casting int's -ENODEV to uint16_t results in 0xFFED,
 		 * hence check ret value for < 0. */
 		if (ret < 0)
 			domid = DOMID_SELF;

 		memset(&map_irq, 0, sizeof(map_irq));
 		map_irq.domid = domid;
 		map_irq.type = MAP_PIRQ_TYPE_MSI;
 		map_irq.index = -1;
 		map_irq.pirq = -1;
 		map_irq.bus = dev->bus->number;
 		map_irq.devfn = dev->devfn;

 		if (type == PCI_CAP_ID_MSIX) {
 			int pos;
 			u32 table_offset, bir;

 			pos = pci_find_capability(dev, PCI_CAP_ID_MSIX);

 			pci_read_config_dword(dev, pos + PCI_MSIX_TABLE,
 					      &table_offset);
 			bir = (u8)(table_offset & PCI_MSIX_FLAGS_BIRMASK);

 			map_irq.table_base = pci_resource_start(dev, bir);
 			map_irq.entry_nr = msidesc->msi_attrib.entry_nr;
 		}

 		ret = HYPERVISOR_physdev_op(PHYSDEVOP_map_pirq, &map_irq);
 		if (ret) {
 			dev_warn(&dev->dev, "xen map irq failed %d for %d domain\n",
 				 ret, domid);
 			goto out;
 		}

 		ret = xen_bind_pirq_msi_to_irq(dev, msidesc,
 					       map_irq.pirq, map_irq.index,
 					       (type == PCI_CAP_ID_MSIX) ?
 					       "msi-x" : "msi",
 						domid);
 		if (ret < 0)
 			goto out;
 	}
 	ret = 0;
 out:
 	return ret;
 }
 #endif
 #endif

 static int xen_pcifront_enable_irq(struct pci_dev *dev)
 {
 	int rc;
 	int share = 1;
 	int pirq;
 	u8 gsi;

 	rc = pci_read_config_byte(dev, PCI_INTERRUPT_LINE, &gsi);
 	if (rc < 0) {
 		dev_warn(&dev->dev, "Xen PCI: failed to read interrupt line: %d\n",
 			 rc);
 		return rc;
 	}

 	rc = xen_allocate_pirq_gsi(gsi);
 	if (rc < 0) {
 		dev_warn(&dev->dev, "Xen PCI: failed to allocate a PIRQ for GSI%d: %d\n",
 			 gsi, rc);
 		return rc;
 	}
 	pirq = rc;

 	if (gsi < NR_IRQS_LEGACY)
 		share = 0;

 	rc = xen_bind_pirq_gsi_to_irq(gsi, pirq, share, "pcifront");
 	if (rc < 0) {
 		dev_warn(&dev->dev, "Xen PCI: failed to bind GSI%d (PIRQ%d) to IRQ: %d\n",
 			 gsi, pirq, rc);
 		return rc;
 	}

 	dev->irq = rc;
 	dev_info(&dev->dev, "Xen PCI mapped GSI%d to IRQ%d\n", gsi, dev->irq);
 	return 0;
 }

 int __init pci_xen_init(void)
 {
 	if (!xen_pv_domain() || xen_initial_domain())
 		return -ENODEV;

 	printk(KERN_INFO "PCI: setting up Xen PCI frontend stub\n");

 	pcibios_set_cache_line_size();

 	pcibios_enable_irq = xen_pcifront_enable_irq;
 	pcibios_disable_irq = NULL;

 #ifdef CONFIG_ACPI
 	/* Keep ACPI out of the picture */
 	acpi_noirq = 1;
 #endif

 #ifdef CONFIG_PCI_MSI
 	x86_msi.setup_msi_irqs = xen_setup_msi_irqs;
 	x86_msi.teardown_msi_irq = xen_teardown_msi_irq;
 	x86_msi.teardown_msi_irqs = xen_teardown_msi_irqs;
 #endif
 	return 0;
 }

 int __init pci_xen_hvm_init(void)
 {
 	if (!xen_feature(XENFEAT_hvm_pirqs))
 		return 0;

 #ifdef CONFIG_ACPI
 	/*
 	 * We don't want to change the actual ACPI delivery model,
 	 * just how GSIs get registered.
 	 */
 	__acpi_register_gsi = acpi_register_gsi_xen_hvm;
 #endif

 #ifdef CONFIG_PCI_MSI
 	x86_msi.setup_msi_irqs = xen_hvm_setup_msi_irqs;
 	x86_msi.teardown_msi_irq = xen_teardown_msi_irq;
 #endif
 	return 0;
 }

 #ifdef CONFIG_XEN_DOM0
 static int xen_register_pirq(u32 gsi, int gsi_override, int triggering)
 {
 	int rc, pirq, irq = -1;
 	struct physdev_map_pirq map_irq;
 	int shareable = 0;
 	char *name;

 	if (!xen_pv_domain())
 		return -1;

 	if (triggering == ACPI_EDGE_SENSITIVE) {
 		shareable = 0;
 		name = "ioapic-edge";
 	} else {
 		shareable = 1;
 		name = "ioapic-level";
 	}
 	pirq = xen_allocate_pirq_gsi(gsi);
 	if (pirq < 0)
 		goto out;

 	if (gsi_override >= 0)
 		irq = xen_bind_pirq_gsi_to_irq(gsi_override, pirq, shareable, name);
 	else
 		irq = xen_bind_pirq_gsi_to_irq(gsi, pirq, shareable, name);
 	if (irq < 0)
 		goto out;

 	printk(KERN_DEBUG "xen: --> pirq=%d -> irq=%d (gsi=%d)\n", pirq, irq, gsi);

 	map_irq.domid = DOMID_SELF;
 	map_irq.type = MAP_PIRQ_TYPE_GSI;
 	map_irq.index = gsi;
 	map_irq.pirq = pirq;

 	rc = HYPERVISOR_physdev_op(PHYSDEVOP_map_pirq, &map_irq);
 	if (rc) {
 		printk(KERN_WARNING "xen map irq failed %d\n", rc);
 		return -1;
 	}

 out:
 	return irq;
 }

 static int xen_register_gsi(u32 gsi, int gsi_override, int triggering, int polarity)
 {
 	int rc, irq;
 	struct physdev_setup_gsi setup_gsi;

 	if (!xen_pv_domain())
 		return -1;

 	printk(KERN_DEBUG "xen: registering gsi %u triggering %d polarity %d\n",
 			gsi, triggering, polarity);

 	irq = xen_register_pirq(gsi, gsi_override, triggering);

 	setup_gsi.gsi = gsi;
 	setup_gsi.triggering = (triggering == ACPI_EDGE_SENSITIVE ? 0 : 1);
 	setup_gsi.polarity = (polarity == ACPI_ACTIVE_HIGH ? 0 : 1);

 	rc = HYPERVISOR_physdev_op(PHYSDEVOP_setup_gsi, &setup_gsi);
 	if (rc == -EEXIST)
 		printk(KERN_INFO "Already setup the GSI :%d\n", gsi);
 	else if (rc) {
 		printk(KERN_ERR "Failed to setup GSI :%d, err_code:%d\n",
 				gsi, rc);
 	}

 	return irq;
 }

 static __init void xen_setup_acpi_sci(void)
 {
 	int rc;
 	int trigger, polarity;
 	int gsi = acpi_sci_override_gsi;
 	int irq = -1;
 	int gsi_override = -1;

 	if (!gsi)
 		return;

 	rc = acpi_get_override_irq(gsi, &trigger, &polarity);
 	if (rc) {
 		printk(KERN_WARNING "xen: acpi_get_override_irq failed for acpi"
 				" sci, rc=%d\n", rc);
 		return;
 	}
 	trigger = trigger ? ACPI_LEVEL_SENSITIVE : ACPI_EDGE_SENSITIVE;
 	polarity = polarity ? ACPI_ACTIVE_LOW : ACPI_ACTIVE_HIGH;

 	printk(KERN_INFO "xen: sci override: global_irq=%d trigger=%d "
 			"polarity=%d\n", gsi, trigger, polarity);

 	/* Before we bind the GSI to a Linux IRQ, check whether
 	 * we need to override it with bus_irq (IRQ) value. Usually for
 	 * IRQs below IRQ_LEGACY_IRQ this holds IRQ == GSI, as so:
 	 *  ACPI: INT_SRC_OVR (bus 0 bus_irq 9 global_irq 9 low level)
 	 * but there are oddballs where the IRQ != GSI:
 	 *  ACPI: INT_SRC_OVR (bus 0 bus_irq 9 global_irq 20 low level)
 	 * which ends up being: gsi_to_irq[9] == 20
 	 * (which is what acpi_gsi_to_irq ends up calling when starting the
 	 * the ACPI interpreter and keels over since IRQ 9 has not been
 	 * setup as we had setup IRQ 20 for it).
 	 */
 	/* Check whether the GSI != IRQ */
 	if (acpi_gsi_to_irq(gsi, &irq) == 0) {
 		if (irq >= 0 && irq != gsi)
 			/* Bugger, we MUST have that IRQ. */
 			gsi_override = irq;
 	}

 	gsi = xen_register_gsi(gsi, gsi_override, trigger, polarity);
 	printk(KERN_INFO "xen: acpi sci %d\n", gsi);

 	return;
 }

 static int acpi_register_gsi_xen(struct device *dev, u32 gsi,
 				 int trigger, int polarity)
 {
 	return xen_register_gsi(gsi, -1 /* no GSI override */, trigger, polarity);
 }

 static int __init pci_xen_initial_domain(void)
 {
 #ifdef CONFIG_PCI_MSI
 	x86_msi.setup_msi_irqs = xen_initdom_setup_msi_irqs;
 	x86_msi.teardown_msi_irq = xen_teardown_msi_irq;
 #endif
 	xen_setup_acpi_sci();
 	__acpi_register_gsi = acpi_register_gsi_xen;

 	return 0;
 }

 void __init xen_setup_pirqs(void)
 {
 	int pirq, irq;

 	pci_xen_initial_domain();

 	if (0 == nr_ioapics) {
 		for (irq = 0; irq < NR_IRQS_LEGACY; irq++) {
 			pirq = xen_allocate_pirq_gsi(irq);
 			if (WARN(pirq < 0,
 				 "Could not allocate PIRQ for legacy interrupt\n"))
 				break;
 			irq = xen_bind_pirq_gsi_to_irq(irq, pirq, 0, "xt-pic");
 		}
 		return;
 	}

 	/* Pre-allocate legacy irqs */
 	for (irq = 0; irq < NR_IRQS_LEGACY; irq++) {
 		int trigger, polarity;

 		if (acpi_get_override_irq(irq, &trigger, &polarity) == -1)
 			continue;

 		xen_register_pirq(irq, -1 /* no GSI override */,
 			trigger ? ACPI_LEVEL_SENSITIVE : ACPI_EDGE_SENSITIVE);
 	}
 }
 #endif

 #ifdef CONFIG_XEN_DOM0
 struct xen_device_domain_owner {
 	domid_t domain;
 	struct pci_dev *dev;
 	struct list_head list;
 };

 static DEFINE_SPINLOCK(dev_domain_list_spinlock);
 static struct list_head dev_domain_list = LIST_HEAD_INIT(dev_domain_list);

 static struct xen_device_domain_owner *find_device(struct pci_dev *dev)
 {
 	struct xen_device_domain_owner *owner;

 	list_for_each_entry(owner, &dev_domain_list, list) {
 		if (owner->dev == dev)
 			return owner;
 	}
 	return NULL;
 }

 int xen_find_device_domain_owner(struct pci_dev *dev)
 {
 	struct xen_device_domain_owner *owner;
 	int domain = -ENODEV;

 	spin_lock(&dev_domain_list_spinlock);
 	owner = find_device(dev);
 	if (owner)
 		domain = owner->domain;
 	spin_unlock(&dev_domain_list_spinlock);
 	return domain;
 }
 EXPORT_SYMBOL_GPL(xen_find_device_domain_owner);

 int xen_register_device_domain_owner(struct pci_dev *dev, uint16_t domain)
 {
 	struct xen_device_domain_owner *owner;

 	owner = kzalloc(sizeof(struct xen_device_domain_owner), GFP_KERNEL);
 	if (!owner)
 		return -ENODEV;

 	spin_lock(&dev_domain_list_spinlock);
 	if (find_device(dev)) {
 		spin_unlock(&dev_domain_list_spinlock);
 		kfree(owner);
 		return -EEXIST;
 	}
 	owner->domain = domain;
 	owner->dev = dev;
 	list_add_tail(&owner->list, &dev_domain_list);
 	spin_unlock(&dev_domain_list_spinlock);
 	return 0;
 }
 EXPORT_SYMBOL_GPL(xen_register_device_domain_owner);

 int xen_unregister_device_domain_owner(struct pci_dev *dev)
 {
 	struct xen_device_domain_owner *owner;

 	spin_lock(&dev_domain_list_spinlock);
 	owner = find_device(dev);
 	if (!owner) {
 		spin_unlock(&dev_domain_list_spinlock);
 		return -ENODEV;
 	}
 	list_del(&owner->list);
 	spin_unlock(&dev_domain_list_spinlock);
 	kfree(owner);
 	return 0;
 }
 EXPORT_SYMBOL_GPL(xen_unregister_device_domain_owner);
 #endif
	/*
	* Xen PCI Frontend Stub - puts some "dummy" functions in to the Linux
	* x86 PCI core to support the Xen PCI Frontend
	*
	* Author: Ryan Wilson <hap9@epoch.ncsc.mil>
	*/
	#include <linux/module.h>
	#include <linux/init.h>
	#include <linux/pci.h>
	#include <linux/acpi.h>

	#include <linux/io.h>
	#include <asm/io_apic.h>
	#include <asm/pci_x86.h>

	#include <asm/xen/hypervisor.h>

	#include <xen/features.h>
	#include <xen/events.h>
	#include <asm/xen/pci.h>

	#ifdef CONFIG_ACPI
	static int acpi_register_gsi_xen_hvm(struct device *dev, u32 gsi,
	int trigger, int polarity)
	{
	int rc, irq;
	struct physdev_map_pirq map_irq;
	int shareable = 0;
	char *name;

	if (!xen_hvm_domain())
	return -1;

	map_irq.domid = DOMID_SELF;
	map_irq.type = MAP_PIRQ_TYPE_GSI;
	map_irq.index = gsi;
	map_irq.pirq = -1;

	rc = HYPERVISOR_physdev_op(PHYSDEVOP_map_pirq, &map_irq);
	if (rc) {
	printk(KERN_WARNING "xen map irq failed %d\n", rc);
	return -1;
	}

	if (trigger == ACPI_EDGE_SENSITIVE) {
	shareable = 0;
	name = "ioapic-edge";
	} else {
	shareable = 1;
	name = "ioapic-level";
	}

	irq = xen_bind_pirq_gsi_to_irq(gsi, map_irq.pirq, shareable, name);

	printk(KERN_DEBUG "xen: --> irq=%d, pirq=%d\n", irq, map_irq.pirq);

	return irq;
	}
	#endif

	#if defined(CONFIG_PCI_MSI)
	#include <linux/msi.h>
	#include <asm/msidef.h>

	struct xen_pci_frontend_ops *xen_pci_frontend;
	EXPORT_SYMBOL_GPL(xen_pci_frontend);

	#define XEN_PIRQ_MSI_DATA (MSI_DATA_TRIGGER_EDGE \| \
	MSI_DATA_LEVEL_ASSERT \| (3 << 8) \| MSI_DATA_VECTOR(0))

	static void xen_msi_compose_msg(struct pci_dev *pdev, unsigned int pirq,
	struct msi_msg *msg)
	{
	/* We set vector == 0 to tell the hypervisor we don't care about it,
	* but we want a pirq setup instead.
	* We use the dest_id field to pass the pirq that we want. */
	msg->address_hi = MSI_ADDR_BASE_HI \| MSI_ADDR_EXT_DEST_ID(pirq);
	msg->address_lo =
	MSI_ADDR_BASE_LO \|
	MSI_ADDR_DEST_MODE_PHYSICAL \|
	MSI_ADDR_REDIRECTION_CPU \|
	MSI_ADDR_DEST_ID(pirq);

	msg->data = XEN_PIRQ_MSI_DATA;
	}

	static int xen_hvm_setup_msi_irqs(struct pci_dev *dev, int nvec, int type)
	{
	int irq, pirq;
	struct msi_desc *msidesc;
	struct msi_msg msg;

	list_for_each_entry(msidesc, &dev->msi_list, list) {
	__read_msi_msg(msidesc, &msg);
	pirq = MSI_ADDR_EXT_DEST_ID(msg.address_hi) \|
	((msg.address_lo >> MSI_ADDR_DEST_ID_SHIFT) & 0xff);
	if (msg.data != XEN_PIRQ_MSI_DATA \|\|
	xen_irq_from_pirq(pirq) < 0) {
	pirq = xen_allocate_pirq_msi(dev, msidesc);
	if (pirq < 0)
	goto error;
	xen_msi_compose_msg(dev, pirq, &msg);
	__write_msi_msg(msidesc, &msg);
	dev_dbg(&dev->dev, "xen: msi bound to pirq=%d\n", pirq);
	} else {
	dev_dbg(&dev->dev,
	"xen: msi already bound to pirq=%d\n", pirq);
	}
	irq = xen_bind_pirq_msi_to_irq(dev, msidesc, pirq, 0,
	(type == PCI_CAP_ID_MSIX) ?
	"msi-x" : "msi",
	DOMID_SELF);
	if (irq < 0)
	goto error;
	dev_dbg(&dev->dev,
	"xen: msi --> pirq=%d --> irq=%d\n", pirq, irq);
	}
	return 0;

	error:
	dev_err(&dev->dev,
	"Xen PCI frontend has not registered MSI/MSI-X support!\n");
	return -ENODEV;
	}

	/*
	* For MSI interrupts we have to use drivers/xen/event.s functions to
	* allocate an irq_desc and setup the right */


	static int xen_setup_msi_irqs(struct pci_dev *dev, int nvec, int type)
	{
	int irq, ret, i;
	struct msi_desc *msidesc;
	int *v;

	v = kzalloc(sizeof(int) * max(1, nvec), GFP_KERNEL);
	if (!v)
	return -ENOMEM;

	if (type == PCI_CAP_ID_MSIX)
	ret = xen_pci_frontend_enable_msix(dev, v, nvec);
	else
	ret = xen_pci_frontend_enable_msi(dev, v);
	if (ret)
	goto error;
	i = 0;
	list_for_each_entry(msidesc, &dev->msi_list, list) {
	irq = xen_bind_pirq_msi_to_irq(dev, msidesc, v[i], 0,
	(type == PCI_CAP_ID_MSIX) ?
	"pcifront-msi-x" :
	"pcifront-msi",
	DOMID_SELF);
	if (irq < 0)
	goto free;
	i++;
	}
	kfree(v);
	return 0;

	error:
	dev_err(&dev->dev, "Xen PCI frontend has not registered MSI/MSI-X support!\n");
	free:
	kfree(v);
	return ret;
	}

	static void xen_teardown_msi_irqs(struct pci_dev *dev)
	{
	struct msi_desc *msidesc;

	msidesc = list_entry(dev->msi_list.next, struct msi_desc, list);
	if (msidesc->msi_attrib.is_msix)
	xen_pci_frontend_disable_msix(dev);
	else
	xen_pci_frontend_disable_msi(dev);

	/* Free the IRQ's and the msidesc using the generic code. */
	default_teardown_msi_irqs(dev);
	}

	static void xen_teardown_msi_irq(unsigned int irq)
	{
	xen_destroy_irq(irq);
	}

	#ifdef CONFIG_XEN_DOM0
	static int xen_initdom_setup_msi_irqs(struct pci_dev *dev, int nvec, int type)
	{
	int ret = 0;
	struct msi_desc *msidesc;

	list_for_each_entry(msidesc, &dev->msi_list, list) {
	struct physdev_map_pirq map_irq;
	domid_t domid;

	domid = ret = xen_find_device_domain_owner(dev);
	/* N.B. Casting int's -ENODEV to uint16_t results in 0xFFED,
	* hence check ret value for < 0. */
	if (ret < 0)
	domid = DOMID_SELF;

	memset(&map_irq, 0, sizeof(map_irq));
	map_irq.domid = domid;
	map_irq.type = MAP_PIRQ_TYPE_MSI;
	map_irq.index = -1;
	map_irq.pirq = -1;
	map_irq.bus = dev->bus->number;
	map_irq.devfn = dev->devfn;

	if (type == PCI_CAP_ID_MSIX) {
	int pos;
	u32 table_offset, bir;

	pos = pci_find_capability(dev, PCI_CAP_ID_MSIX);

	pci_read_config_dword(dev, pos + PCI_MSIX_TABLE,
	&table_offset);
	bir = (u8)(table_offset & PCI_MSIX_FLAGS_BIRMASK);

	map_irq.table_base = pci_resource_start(dev, bir);
	map_irq.entry_nr = msidesc->msi_attrib.entry_nr;
	}

	ret = HYPERVISOR_physdev_op(PHYSDEVOP_map_pirq, &map_irq);
	if (ret) {
	dev_warn(&dev->dev, "xen map irq failed %d for %d domain\n",
	ret, domid);
	goto out;
	}

	ret = xen_bind_pirq_msi_to_irq(dev, msidesc,
	map_irq.pirq, map_irq.index,
	(type == PCI_CAP_ID_MSIX) ?
	"msi-x" : "msi",
	domid);
	if (ret < 0)
	goto out;
	}
	ret = 0;
	out:
	return ret;
	}
	#endif
	#endif

	static int xen_pcifront_enable_irq(struct pci_dev *dev)
	{
	int rc;
	int share = 1;
	int pirq;
	u8 gsi;

	rc = pci_read_config_byte(dev, PCI_INTERRUPT_LINE, &gsi);
	if (rc < 0) {
	dev_warn(&dev->dev, "Xen PCI: failed to read interrupt line: %d\n",
	rc);
	return rc;
	}

	rc = xen_allocate_pirq_gsi(gsi);
	if (rc < 0) {
	dev_warn(&dev->dev, "Xen PCI: failed to allocate a PIRQ for GSI%d: %d\n",
	gsi, rc);
	return rc;
	}
	pirq = rc;

	if (gsi < NR_IRQS_LEGACY)
	share = 0;

	rc = xen_bind_pirq_gsi_to_irq(gsi, pirq, share, "pcifront");
	if (rc < 0) {
	dev_warn(&dev->dev, "Xen PCI: failed to bind GSI%d (PIRQ%d) to IRQ: %d\n",
	gsi, pirq, rc);
	return rc;
	}

	dev->irq = rc;
	dev_info(&dev->dev, "Xen PCI mapped GSI%d to IRQ%d\n", gsi, dev->irq);
	return 0;
	}

	int __init pci_xen_init(void)
	{
	if (!xen_pv_domain() \|\| xen_initial_domain())
	return -ENODEV;

	printk(KERN_INFO "PCI: setting up Xen PCI frontend stub\n");

	pcibios_set_cache_line_size();

	pcibios_enable_irq = xen_pcifront_enable_irq;
	pcibios_disable_irq = NULL;

	#ifdef CONFIG_ACPI
	/* Keep ACPI out of the picture */
	acpi_noirq = 1;
	#endif

	#ifdef CONFIG_PCI_MSI
	x86_msi.setup_msi_irqs = xen_setup_msi_irqs;
	x86_msi.teardown_msi_irq = xen_teardown_msi_irq;
	x86_msi.teardown_msi_irqs = xen_teardown_msi_irqs;
	#endif
	return 0;
	}

	int __init pci_xen_hvm_init(void)
	{
	if (!xen_feature(XENFEAT_hvm_pirqs))
	return 0;

	#ifdef CONFIG_ACPI
	/*
	* We don't want to change the actual ACPI delivery model,
	* just how GSIs get registered.
	*/
	__acpi_register_gsi = acpi_register_gsi_xen_hvm;
	#endif

	#ifdef CONFIG_PCI_MSI
	x86_msi.setup_msi_irqs = xen_hvm_setup_msi_irqs;
	x86_msi.teardown_msi_irq = xen_teardown_msi_irq;
	#endif
	return 0;
	}

	#ifdef CONFIG_XEN_DOM0
	static int xen_register_pirq(u32 gsi, int gsi_override, int triggering)
	{
	int rc, pirq, irq = -1;
	struct physdev_map_pirq map_irq;
	int shareable = 0;
	char *name;

	if (!xen_pv_domain())
	return -1;

	if (triggering == ACPI_EDGE_SENSITIVE) {
	shareable = 0;
	name = "ioapic-edge";
	} else {
	shareable = 1;
	name = "ioapic-level";
	}
	pirq = xen_allocate_pirq_gsi(gsi);
	if (pirq < 0)
	goto out;

	if (gsi_override >= 0)
	irq = xen_bind_pirq_gsi_to_irq(gsi_override, pirq, shareable, name);
	else
	irq = xen_bind_pirq_gsi_to_irq(gsi, pirq, shareable, name);
	if (irq < 0)
	goto out;

	printk(KERN_DEBUG "xen: --> pirq=%d -> irq=%d (gsi=%d)\n", pirq, irq, gsi);

	map_irq.domid = DOMID_SELF;
	map_irq.type = MAP_PIRQ_TYPE_GSI;
	map_irq.index = gsi;
	map_irq.pirq = pirq;

	rc = HYPERVISOR_physdev_op(PHYSDEVOP_map_pirq, &map_irq);
	if (rc) {
	printk(KERN_WARNING "xen map irq failed %d\n", rc);
	return -1;
	}

	out:
	return irq;
	}

	static int xen_register_gsi(u32 gsi, int gsi_override, int triggering, int polarity)
	{
	int rc, irq;
	struct physdev_setup_gsi setup_gsi;

	if (!xen_pv_domain())
	return -1;

	printk(KERN_DEBUG "xen: registering gsi %u triggering %d polarity %d\n",
	gsi, triggering, polarity);

	irq = xen_register_pirq(gsi, gsi_override, triggering);

	setup_gsi.gsi = gsi;
	setup_gsi.triggering = (triggering == ACPI_EDGE_SENSITIVE ? 0 : 1);
	setup_gsi.polarity = (polarity == ACPI_ACTIVE_HIGH ? 0 : 1);

	rc = HYPERVISOR_physdev_op(PHYSDEVOP_setup_gsi, &setup_gsi);
	if (rc == -EEXIST)
	printk(KERN_INFO "Already setup the GSI :%d\n", gsi);
	else if (rc) {
	printk(KERN_ERR "Failed to setup GSI :%d, err_code:%d\n",
	gsi, rc);
	}

	return irq;
	}

	static __init void xen_setup_acpi_sci(void)
	{
	int rc;
	int trigger, polarity;
	int gsi = acpi_sci_override_gsi;
	int irq = -1;
	int gsi_override = -1;

	if (!gsi)
	return;

	rc = acpi_get_override_irq(gsi, &trigger, &polarity);
	if (rc) {
	printk(KERN_WARNING "xen: acpi_get_override_irq failed for acpi"
	" sci, rc=%d\n", rc);
	return;
	}
	trigger = trigger ? ACPI_LEVEL_SENSITIVE : ACPI_EDGE_SENSITIVE;
	polarity = polarity ? ACPI_ACTIVE_LOW : ACPI_ACTIVE_HIGH;

	printk(KERN_INFO "xen: sci override: global_irq=%d trigger=%d "
	"polarity=%d\n", gsi, trigger, polarity);

	/* Before we bind the GSI to a Linux IRQ, check whether
	* we need to override it with bus_irq (IRQ) value. Usually for
	* IRQs below IRQ_LEGACY_IRQ this holds IRQ == GSI, as so:
	* ACPI: INT_SRC_OVR (bus 0 bus_irq 9 global_irq 9 low level)
	* but there are oddballs where the IRQ != GSI:
	* ACPI: INT_SRC_OVR (bus 0 bus_irq 9 global_irq 20 low level)
	* which ends up being: gsi_to_irq[9] == 20
	* (which is what acpi_gsi_to_irq ends up calling when starting the
	* the ACPI interpreter and keels over since IRQ 9 has not been
	* setup as we had setup IRQ 20 for it).
	*/
	/* Check whether the GSI != IRQ */
	if (acpi_gsi_to_irq(gsi, &irq) == 0) {
	if (irq >= 0 && irq != gsi)
	/* Bugger, we MUST have that IRQ. */
	gsi_override = irq;
	}

	gsi = xen_register_gsi(gsi, gsi_override, trigger, polarity);
	printk(KERN_INFO "xen: acpi sci %d\n", gsi);

	return;
	}

	static int acpi_register_gsi_xen(struct device *dev, u32 gsi,
	int trigger, int polarity)
	{
	return xen_register_gsi(gsi, -1 /* no GSI override */, trigger, polarity);
	}

	static int __init pci_xen_initial_domain(void)
	{
	#ifdef CONFIG_PCI_MSI
	x86_msi.setup_msi_irqs = xen_initdom_setup_msi_irqs;
	x86_msi.teardown_msi_irq = xen_teardown_msi_irq;
	#endif
	xen_setup_acpi_sci();
	__acpi_register_gsi = acpi_register_gsi_xen;

	return 0;
	}

	void __init xen_setup_pirqs(void)
	{
	int pirq, irq;

	pci_xen_initial_domain();

	if (0 == nr_ioapics) {
	for (irq = 0; irq < NR_IRQS_LEGACY; irq++) {
	pirq = xen_allocate_pirq_gsi(irq);
	if (WARN(pirq < 0,
	"Could not allocate PIRQ for legacy interrupt\n"))
	break;
	irq = xen_bind_pirq_gsi_to_irq(irq, pirq, 0, "xt-pic");
	}
	return;
	}

	/* Pre-allocate legacy irqs */
	for (irq = 0; irq < NR_IRQS_LEGACY; irq++) {
	int trigger, polarity;

	if (acpi_get_override_irq(irq, &trigger, &polarity) == -1)
	continue;

	xen_register_pirq(irq, -1 /* no GSI override */,
	trigger ? ACPI_LEVEL_SENSITIVE : ACPI_EDGE_SENSITIVE);
	}
	}
	#endif

	#ifdef CONFIG_XEN_DOM0
	struct xen_device_domain_owner {
	domid_t domain;
	struct pci_dev *dev;
	struct list_head list;
	};

	static DEFINE_SPINLOCK(dev_domain_list_spinlock);
	static struct list_head dev_domain_list = LIST_HEAD_INIT(dev_domain_list);

	static struct xen_device_domain_owner find_device(struct pci_dev dev)
	{
	struct xen_device_domain_owner *owner;

	list_for_each_entry(owner, &dev_domain_list, list) {
	if (owner->dev == dev)
	return owner;
	}
	return NULL;
	}

	int xen_find_device_domain_owner(struct pci_dev *dev)
	{
	struct xen_device_domain_owner *owner;
	int domain = -ENODEV;

	spin_lock(&dev_domain_list_spinlock);
	owner = find_device(dev);
	if (owner)
	domain = owner->domain;
	spin_unlock(&dev_domain_list_spinlock);
	return domain;
	}
	EXPORT_SYMBOL_GPL(xen_find_device_domain_owner);

	int xen_register_device_domain_owner(struct pci_dev *dev, uint16_t domain)
	{
	struct xen_device_domain_owner *owner;

	owner = kzalloc(sizeof(struct xen_device_domain_owner), GFP_KERNEL);
	if (!owner)
	return -ENODEV;

	spin_lock(&dev_domain_list_spinlock);
	if (find_device(dev)) {
	spin_unlock(&dev_domain_list_spinlock);
	kfree(owner);
	return -EEXIST;
	}
	owner->domain = domain;
	owner->dev = dev;
	list_add_tail(&owner->list, &dev_domain_list);
	spin_unlock(&dev_domain_list_spinlock);
	return 0;
	}
	EXPORT_SYMBOL_GPL(xen_register_device_domain_owner);

	int xen_unregister_device_domain_owner(struct pci_dev *dev)
	{
	struct xen_device_domain_owner *owner;

	spin_lock(&dev_domain_list_spinlock);
	owner = find_device(dev);
	if (!owner) {
	spin_unlock(&dev_domain_list_spinlock);
	return -ENODEV;
	}
	list_del(&owner->list);
	spin_unlock(&dev_domain_list_spinlock);
	kfree(owner);
	return 0;
	}
	EXPORT_SYMBOL_GPL(xen_unregister_device_domain_owner);
	#endif