[deliverable/linux.git] / arch / x86 / pci / xen.c

/*
 * 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/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 xen_hvm_register_pirq(u32 gsi, int triggering)
{
	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 (triggering == ACPI_EDGE_SENSITIVE) {
		shareable = 0;
		name = "ioapic-edge";
	} else {
		shareable = 1;
		name = "ioapic-level";
	}

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

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

	return irq;
}

static int acpi_register_gsi_xen_hvm(struct device *dev, u32 gsi,
				 int trigger, int polarity)
{
	return xen_hvm_register_pirq(gsi, trigger);
}
#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);

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 =
		MSI_DATA_TRIGGER_EDGE |
		MSI_DATA_LEVEL_ASSERT |
		/* delivery mode reserved */
		(3 << 8) |
		MSI_DATA_VECTOR(0);
}

static int xen_hvm_setup_msi_irqs(struct pci_dev *dev, int nvec, int type)
{
	int irq, pirq, ret = 0;
	struct msi_desc *msidesc;
	struct msi_msg msg;

	list_for_each_entry(msidesc, &dev->msi_list, list) {
		xen_allocate_pirq_msi((type == PCI_CAP_ID_MSIX) ?
				"msi-x" : "msi", &irq, &pirq);
		if (irq < 0 || pirq < 0)
			goto error;
		printk(KERN_DEBUG "xen: msi --> irq=%d, pirq=%d\n", irq, pirq);
		xen_msi_compose_msg(dev, pirq, &msg);
		ret = set_irq_msi(irq, msidesc);
		if (ret < 0)
			goto error_while;
		write_msi_msg(irq, &msg);
	}
	return 0;

error_while:
	unbind_from_irqhandler(irq, NULL);
error:
	if (ret == -ENODEV)
		dev_err(&dev->dev, "Xen PCI frontend has not registered" \
				" MSI/MSI-X support!\n");

	return ret;
}

/*
 * 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_allocate_pirq(v[i], 0, /* not sharable */
			(type == PCI_CAP_ID_MSIX) ?
			"pcifront-msi-x" : "pcifront-msi");
		if (irq < 0)
			return -1;

		ret = set_irq_msi(irq, msidesc);
		if (ret)
			goto error_while;
		i++;
	}
	kfree(v);
	return 0;

error_while:
	unbind_from_irqhandler(irq, NULL);
error:
	if (ret == -ENODEV)
		dev_err(&dev->dev, "Xen PCI frontend has not registered" \
			" MSI/MSI-X support!\n");

	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);
}

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

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

	list_for_each_entry(msidesc, &dev->msi_list, list) {
		irq = xen_create_msi_irq(dev, msidesc, type);
		if (irq < 0)
			return -1;

		ret = set_irq_msi(irq, msidesc);
		if (ret)
			goto error;
	}
	return 0;

error:
	xen_destroy_irq(irq);
	return ret;
}
#endif

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

	dev_info(&dev->dev, "Xen PCI enabling IRQ: %d\n", dev->irq);

	if (dev->irq < 0)
		return -EINVAL;

	if (dev->irq < NR_IRQS_LEGACY)
		share = 0;

	rc = xen_allocate_pirq(dev->irq, share, "pcifront");
	if (rc < 0) {
		dev_warn(&dev->dev, "Xen PCI IRQ: %d, failed to register:%d\n",
			 dev->irq, rc);
		return rc;
	}
	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 triggering)
{
	int rc, irq;
	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";
	}

	irq = xen_allocate_pirq(gsi, shareable, name);

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

	if (irq < 0)
		goto out;

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

	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 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, 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;

	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);

	gsi = xen_register_gsi(gsi, 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, 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 irq;

	pci_xen_initial_domain();

	if (0 == nr_ioapics) {
		for (irq = 0; irq < NR_IRQS_LEGACY; irq++)
			xen_allocate_pirq(irq, 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,
			trigger ? ACPI_LEVEL_SENSITIVE : ACPI_EDGE_SENSITIVE);
	}
}
#endif
Commit	Line	Data
b5401a96 AN	1	/*
	2	* Xen PCI Frontend Stub - puts some "dummy" functions in to the Linux
	3	* x86 PCI core to support the Xen PCI Frontend
	4	*
	5	* Author: Ryan Wilson <hap9@epoch.ncsc.mil>
	6	*/
	7	#include <linux/module.h>
	8	#include <linux/init.h>
	9	#include <linux/pci.h>
	10	#include <linux/acpi.h>
	11
	12	#include <linux/io.h>
	13	#include <asm/pci_x86.h>
	14
	15	#include <asm/xen/hypervisor.h>
	16
3942b740	17	#include <xen/features.h>
b5401a96 AN	18	#include <xen/events.h>
	19	#include <asm/xen/pci.h>
	20
42a1de56 SS	21	#ifdef CONFIG_ACPI
	22	static int xen_hvm_register_pirq(u32 gsi, int triggering)
	23	{
	24	int rc, irq;
	25	struct physdev_map_pirq map_irq;
	26	int shareable = 0;
	27	char *name;
	28
	29	if (!xen_hvm_domain())
	30	return -1;
	31
	32	map_irq.domid = DOMID_SELF;
	33	map_irq.type = MAP_PIRQ_TYPE_GSI;
	34	map_irq.index = gsi;
	35	map_irq.pirq = -1;
	36
	37	rc = HYPERVISOR_physdev_op(PHYSDEVOP_map_pirq, &map_irq);
	38	if (rc) {
	39	printk(KERN_WARNING "xen map irq failed %d\n", rc);
	40	return -1;
	41	}
	42
	43	if (triggering == ACPI_EDGE_SENSITIVE) {
	44	shareable = 0;
	45	name = "ioapic-edge";
	46	} else {
	47	shareable = 1;
	48	name = "ioapic-level";
	49	}
	50
	51	irq = xen_map_pirq_gsi(map_irq.pirq, gsi, shareable, name);
	52
	53	printk(KERN_DEBUG "xen: --> irq=%d, pirq=%d\n", irq, map_irq.pirq);
	54
	55	return irq;
	56	}
90f6881e JF	57
	58	static int acpi_register_gsi_xen_hvm(struct device *dev, u32 gsi,
	59	int trigger, int polarity)
	60	{
	61	return xen_hvm_register_pirq(gsi, trigger);
	62	}
42a1de56 SS	63	#endif
42a1de56 SS	64
b5401a96 AN	65	#if defined(CONFIG_PCI_MSI)
b5401a96 AN	66	#include <linux/msi.h>
809f9267	67	#include <asm/msidef.h>
b5401a96 AN	68
	69	struct xen_pci_frontend_ops *xen_pci_frontend;
	70	EXPORT_SYMBOL_GPL(xen_pci_frontend);
	71
809f9267 SS	72	static void xen_msi_compose_msg(struct pci_dev *pdev, unsigned int pirq,
	73	struct msi_msg *msg)
	74	{
	75	/* We set vector == 0 to tell the hypervisor we don't care about it,
	76	* but we want a pirq setup instead.
	77	* We use the dest_id field to pass the pirq that we want. */
	78	msg->address_hi = MSI_ADDR_BASE_HI \| MSI_ADDR_EXT_DEST_ID(pirq);
	79	msg->address_lo =
	80	MSI_ADDR_BASE_LO \|
	81	MSI_ADDR_DEST_MODE_PHYSICAL \|
	82	MSI_ADDR_REDIRECTION_CPU \|
	83	MSI_ADDR_DEST_ID(pirq);
	84
	85	msg->data =
	86	MSI_DATA_TRIGGER_EDGE \|
	87	MSI_DATA_LEVEL_ASSERT \|
	88	/* delivery mode reserved */
	89	(3 << 8) \|
	90	MSI_DATA_VECTOR(0);
	91	}
	92
	93	static int xen_hvm_setup_msi_irqs(struct pci_dev *dev, int nvec, int type)
	94	{
	95	int irq, pirq, ret = 0;
	96	struct msi_desc *msidesc;
	97	struct msi_msg msg;
	98
	99	list_for_each_entry(msidesc, &dev->msi_list, list) {
	100	xen_allocate_pirq_msi((type == PCI_CAP_ID_MSIX) ?
	101	"msi-x" : "msi", &irq, &pirq);
	102	if (irq < 0 \|\| pirq < 0)
	103	goto error;
	104	printk(KERN_DEBUG "xen: msi --> irq=%d, pirq=%d\n", irq, pirq);
	105	xen_msi_compose_msg(dev, pirq, &msg);
	106	ret = set_irq_msi(irq, msidesc);
	107	if (ret < 0)
	108	goto error_while;
	109	write_msi_msg(irq, &msg);
	110	}
	111	return 0;
	112
	113	error_while:
	114	unbind_from_irqhandler(irq, NULL);
	115	error:
	116	if (ret == -ENODEV)
	117	dev_err(&dev->dev, "Xen PCI frontend has not registered" \
	118	" MSI/MSI-X support!\n");
	119
	120	return ret;
	121	}
	122
b5401a96 AN	123	/*
	124	* For MSI interrupts we have to use drivers/xen/event.s functions to
	125	* allocate an irq_desc and setup the right */
	126
	127
	128	static int xen_setup_msi_irqs(struct pci_dev *dev, int nvec, int type)
	129	{
	130	int irq, ret, i;
	131	struct msi_desc *msidesc;
	132	int *v;
	133
	134	v = kzalloc(sizeof(int) * max(1, nvec), GFP_KERNEL);
	135	if (!v)
	136	return -ENOMEM;
	137
f731e3ef QH	138	if (type == PCI_CAP_ID_MSIX)
	139	ret = xen_pci_frontend_enable_msix(dev, &v, nvec);
	140	else
	141	ret = xen_pci_frontend_enable_msi(dev, &v);
	142	if (ret)
	143	goto error;
b5401a96 AN	144	i = 0;
	145	list_for_each_entry(msidesc, &dev->msi_list, list) {
	146	irq = xen_allocate_pirq(v[i], 0, /* not sharable */
	147	(type == PCI_CAP_ID_MSIX) ?
	148	"pcifront-msi-x" : "pcifront-msi");
	149	if (irq < 0)
	150	return -1;
	151
	152	ret = set_irq_msi(irq, msidesc);
	153	if (ret)
	154	goto error_while;
	155	i++;
	156	}
	157	kfree(v);
	158	return 0;
	159
	160	error_while:
	161	unbind_from_irqhandler(irq, NULL);
	162	error:
	163	if (ret == -ENODEV)
	164	dev_err(&dev->dev, "Xen PCI frontend has not registered" \
	165	" MSI/MSI-X support!\n");
	166
	167	kfree(v);
	168	return ret;
	169	}
	170
	171	static void xen_teardown_msi_irqs(struct pci_dev *dev)
	172	{
f731e3ef	173	struct msi_desc *msidesc;
b5401a96	174
f731e3ef QH	175	msidesc = list_entry(dev->msi_list.next, struct msi_desc, list);
	176	if (msidesc->msi_attrib.is_msix)
	177	xen_pci_frontend_disable_msix(dev);
	178	else
	179	xen_pci_frontend_disable_msi(dev);
b5401a96 AN	180	}
	181
	182	static void xen_teardown_msi_irq(unsigned int irq)
	183	{
	184	xen_destroy_irq(irq);
	185	}
f731e3ef QH	186
	187	static int xen_initdom_setup_msi_irqs(struct pci_dev *dev, int nvec, int type)
	188	{
	189	int irq, ret;
	190	struct msi_desc *msidesc;
	191
	192	list_for_each_entry(msidesc, &dev->msi_list, list) {
	193	irq = xen_create_msi_irq(dev, msidesc, type);
	194	if (irq < 0)
	195	return -1;
	196
	197	ret = set_irq_msi(irq, msidesc);
	198	if (ret)
	199	goto error;
	200	}
	201	return 0;
	202
	203	error:
	204	xen_destroy_irq(irq);
	205	return ret;
	206	}
b5401a96 AN	207	#endif
	208
	209	static int xen_pcifront_enable_irq(struct pci_dev *dev)
	210	{
	211	int rc;
	212	int share = 1;
	213
	214	dev_info(&dev->dev, "Xen PCI enabling IRQ: %d\n", dev->irq);
	215
	216	if (dev->irq < 0)
	217	return -EINVAL;
	218
	219	if (dev->irq < NR_IRQS_LEGACY)
	220	share = 0;
	221
	222	rc = xen_allocate_pirq(dev->irq, share, "pcifront");
	223	if (rc < 0) {
	224	dev_warn(&dev->dev, "Xen PCI IRQ: %d, failed to register:%d\n",
	225	dev->irq, rc);
	226	return rc;
	227	}
	228	return 0;
	229	}
	230
	231	int __init pci_xen_init(void)
	232	{
	233	if (!xen_pv_domain() \|\| xen_initial_domain())
	234	return -ENODEV;
	235
	236	printk(KERN_INFO "PCI: setting up Xen PCI frontend stub\n");
	237
	238	pcibios_set_cache_line_size();
	239
	240	pcibios_enable_irq = xen_pcifront_enable_irq;
	241	pcibios_disable_irq = NULL;
	242
	243	#ifdef CONFIG_ACPI
	244	/* Keep ACPI out of the picture */
	245	acpi_noirq = 1;
	246	#endif
	247
b5401a96 AN	248	#ifdef CONFIG_PCI_MSI
	249	x86_msi.setup_msi_irqs = xen_setup_msi_irqs;
	250	x86_msi.teardown_msi_irq = xen_teardown_msi_irq;
	251	x86_msi.teardown_msi_irqs = xen_teardown_msi_irqs;
	252	#endif
	253	return 0;
	254	}
3942b740 SS	255
	256	int __init pci_xen_hvm_init(void)
	257	{
	258	if (!xen_feature(XENFEAT_hvm_pirqs))
	259	return 0;
	260
	261	#ifdef CONFIG_ACPI
	262	/*
	263	* We don't want to change the actual ACPI delivery model,
	264	* just how GSIs get registered.
	265	*/
	266	__acpi_register_gsi = acpi_register_gsi_xen_hvm;
	267	#endif
809f9267 SS	268
	269	#ifdef CONFIG_PCI_MSI
	270	x86_msi.setup_msi_irqs = xen_hvm_setup_msi_irqs;
	271	x86_msi.teardown_msi_irq = xen_teardown_msi_irq;
	272	#endif
3942b740 SS	273	return 0;
3942b740 SS	274	}
38aa66fc JF	275
	276	#ifdef CONFIG_XEN_DOM0
	277	static int xen_register_pirq(u32 gsi, int triggering)
	278	{
	279	int rc, irq;
	280	struct physdev_map_pirq map_irq;
	281	int shareable = 0;
	282	char *name;
	283
	284	if (!xen_pv_domain())
	285	return -1;
	286
	287	if (triggering == ACPI_EDGE_SENSITIVE) {
	288	shareable = 0;
	289	name = "ioapic-edge";
	290	} else {
	291	shareable = 1;
	292	name = "ioapic-level";
	293	}
	294
	295	irq = xen_allocate_pirq(gsi, shareable, name);
	296
	297	printk(KERN_DEBUG "xen: --> irq=%d\n", irq);
	298
	299	if (irq < 0)
	300	goto out;
	301
	302	map_irq.domid = DOMID_SELF;
	303	map_irq.type = MAP_PIRQ_TYPE_GSI;
	304	map_irq.index = gsi;
	305	map_irq.pirq = irq;
	306
	307	rc = HYPERVISOR_physdev_op(PHYSDEVOP_map_pirq, &map_irq);
	308	if (rc) {
	309	printk(KERN_WARNING "xen map irq failed %d\n", rc);
	310	return -1;
	311	}
	312
	313	out:
	314	return irq;
	315	}
	316
	317	static int xen_register_gsi(u32 gsi, int triggering, int polarity)
	318	{
	319	int rc, irq;
	320	struct physdev_setup_gsi setup_gsi;
	321
	322	if (!xen_pv_domain())
	323	return -1;
	324
	325	printk(KERN_DEBUG "xen: registering gsi %u triggering %d polarity %d\n",
	326	gsi, triggering, polarity);
	327
	328	irq = xen_register_pirq(gsi, triggering);
	329
	330	setup_gsi.gsi = gsi;
	331	setup_gsi.triggering = (triggering == ACPI_EDGE_SENSITIVE ? 0 : 1);
	332	setup_gsi.polarity = (polarity == ACPI_ACTIVE_HIGH ? 0 : 1);
	333
	334	rc = HYPERVISOR_physdev_op(PHYSDEVOP_setup_gsi, &setup_gsi);
	335	if (rc == -EEXIST)
	336	printk(KERN_INFO "Already setup the GSI :%d\n", gsi);
	337	else if (rc) {
	338	printk(KERN_ERR "Failed to setup GSI :%d, err_code:%d\n",
339	gsi, rc);
340	}
341
342	return irq;
343	}
344
345	static __init void xen_setup_acpi_sci(void)
346	{
347	int rc;
348	int trigger, polarity;
349	int gsi = acpi_sci_override_gsi;
350
351	if (!gsi)
352	return;
353
354	rc = acpi_get_override_irq(gsi, &trigger, &polarity);
355	if (rc) {
356	printk(KERN_WARNING "xen: acpi_get_override_irq failed for acpi"
357	" sci, rc=%d\n", rc);
358	return;
359	}
360	trigger = trigger ? ACPI_LEVEL_SENSITIVE : ACPI_EDGE_SENSITIVE;
361	polarity = polarity ? ACPI_ACTIVE_LOW : ACPI_ACTIVE_HIGH;
362
363	printk(KERN_INFO "xen: sci override: global_irq=%d trigger=%d "
364	"polarity=%d\n", gsi, trigger, polarity);
365
366	gsi = xen_register_gsi(gsi, trigger, polarity);
367	printk(KERN_INFO "xen: acpi sci %d\n", gsi);
368
369	return;
370	}
371
372	static int acpi_register_gsi_xen(struct device *dev, u32 gsi,
373	int trigger, int polarity)
374	{
375	return xen_register_gsi(gsi, trigger, polarity);
376	}
377
378	static int __init pci_xen_initial_domain(void)
379	{
f731e3ef QH	380	#ifdef CONFIG_PCI_MSI
	381	x86_msi.setup_msi_irqs = xen_initdom_setup_msi_irqs;
	382	x86_msi.teardown_msi_irq = xen_teardown_msi_irq;
	383	#endif
38aa66fc JF	384	xen_setup_acpi_sci();
	385	__acpi_register_gsi = acpi_register_gsi_xen;
	386
	387	return 0;
	388	}
	389
	390	void __init xen_setup_pirqs(void)
	391	{
	392	int irq;
	393
	394	pci_xen_initial_domain();
	395
	396	if (0 == nr_ioapics) {
	397	for (irq = 0; irq < NR_IRQS_LEGACY; irq++)
	398	xen_allocate_pirq(irq, 0, "xt-pic");
	399	return;
	400	}
	401
	402	/* Pre-allocate legacy irqs */
	403	for (irq = 0; irq < NR_IRQS_LEGACY; irq++) {
	404	int trigger, polarity;
	405
	406	if (acpi_get_override_irq(irq, &trigger, &polarity) == -1)
	407	continue;
	408
	409	xen_register_pirq(irq,
	410	trigger ? ACPI_LEVEL_SENSITIVE : ACPI_EDGE_SENSITIVE);
	411	}
	412	}
	413	#endif