[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/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 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) {
			ret = -1;
			goto free;
		}

		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");
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);
}

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>
0e058e52	13	#include <asm/io_apic.h>
b5401a96 AN	14	#include <asm/pci_x86.h>
	15
	16	#include <asm/xen/hypervisor.h>
	17
3942b740	18	#include <xen/features.h>
b5401a96 AN	19	#include <xen/events.h>
	20	#include <asm/xen/pci.h>
	21
42a1de56 SS	22	#ifdef CONFIG_ACPI
	23	static int xen_hvm_register_pirq(u32 gsi, int triggering)
	24	{
	25	int rc, irq;
	26	struct physdev_map_pirq map_irq;
	27	int shareable = 0;
	28	char *name;
	29
	30	if (!xen_hvm_domain())
	31	return -1;
	32
	33	map_irq.domid = DOMID_SELF;
	34	map_irq.type = MAP_PIRQ_TYPE_GSI;
	35	map_irq.index = gsi;
	36	map_irq.pirq = -1;
	37
	38	rc = HYPERVISOR_physdev_op(PHYSDEVOP_map_pirq, &map_irq);
	39	if (rc) {
	40	printk(KERN_WARNING "xen map irq failed %d\n", rc);
	41	return -1;
	42	}
	43
	44	if (triggering == ACPI_EDGE_SENSITIVE) {
	45	shareable = 0;
	46	name = "ioapic-edge";
	47	} else {
	48	shareable = 1;
	49	name = "ioapic-level";
	50	}
	51
	52	irq = xen_map_pirq_gsi(map_irq.pirq, gsi, shareable, name);
	53
	54	printk(KERN_DEBUG "xen: --> irq=%d, pirq=%d\n", irq, map_irq.pirq);
	55
	56	return irq;
	57	}
90f6881e JF	58
	59	static int acpi_register_gsi_xen_hvm(struct device *dev, u32 gsi,
	60	int trigger, int polarity)
	61	{
	62	return xen_hvm_register_pirq(gsi, trigger);
	63	}
42a1de56 SS	64	#endif
42a1de56 SS	65
b5401a96 AN	66	#if defined(CONFIG_PCI_MSI)
b5401a96 AN	67	#include <linux/msi.h>
809f9267	68	#include <asm/msidef.h>
b5401a96 AN	69
	70	struct xen_pci_frontend_ops *xen_pci_frontend;
	71	EXPORT_SYMBOL_GPL(xen_pci_frontend);
	72
809f9267 SS	73	static void xen_msi_compose_msg(struct pci_dev *pdev, unsigned int pirq,
	74	struct msi_msg *msg)
	75	{
	76	/* We set vector == 0 to tell the hypervisor we don't care about it,
	77	* but we want a pirq setup instead.
	78	* We use the dest_id field to pass the pirq that we want. */
	79	msg->address_hi = MSI_ADDR_BASE_HI \| MSI_ADDR_EXT_DEST_ID(pirq);
	80	msg->address_lo =
	81	MSI_ADDR_BASE_LO \|
	82	MSI_ADDR_DEST_MODE_PHYSICAL \|
	83	MSI_ADDR_REDIRECTION_CPU \|
	84	MSI_ADDR_DEST_ID(pirq);
	85
	86	msg->data =
	87	MSI_DATA_TRIGGER_EDGE \|
	88	MSI_DATA_LEVEL_ASSERT \|
	89	/* delivery mode reserved */
	90	(3 << 8) \|
	91	MSI_DATA_VECTOR(0);
	92	}
	93
	94	static int xen_hvm_setup_msi_irqs(struct pci_dev *dev, int nvec, int type)
	95	{
	96	int irq, pirq, ret = 0;
	97	struct msi_desc *msidesc;
	98	struct msi_msg msg;
	99
	100	list_for_each_entry(msidesc, &dev->msi_list, list) {
	101	xen_allocate_pirq_msi((type == PCI_CAP_ID_MSIX) ?
	102	"msi-x" : "msi", &irq, &pirq);
	103	if (irq < 0 \|\| pirq < 0)
	104	goto error;
	105	printk(KERN_DEBUG "xen: msi --> irq=%d, pirq=%d\n", irq, pirq);
	106	xen_msi_compose_msg(dev, pirq, &msg);
	107	ret = set_irq_msi(irq, msidesc);
	108	if (ret < 0)
	109	goto error_while;
	110	write_msi_msg(irq, &msg);
	111	}
	112	return 0;
	113
	114	error_while:
	115	unbind_from_irqhandler(irq, NULL);
	116	error:
	117	if (ret == -ENODEV)
	118	dev_err(&dev->dev, "Xen PCI frontend has not registered" \
	119	" MSI/MSI-X support!\n");
	120
	121	return ret;
	122	}
	123
b5401a96 AN	124	/*
	125	* For MSI interrupts we have to use drivers/xen/event.s functions to
	126	* allocate an irq_desc and setup the right */
	127
	128
	129	static int xen_setup_msi_irqs(struct pci_dev *dev, int nvec, int type)
	130	{
	131	int irq, ret, i;
	132	struct msi_desc *msidesc;
	133	int *v;
	134
	135	v = kzalloc(sizeof(int) * max(1, nvec), GFP_KERNEL);
	136	if (!v)
	137	return -ENOMEM;
	138
f731e3ef QH	139	if (type == PCI_CAP_ID_MSIX)
	140	ret = xen_pci_frontend_enable_msix(dev, &v, nvec);
	141	else
	142	ret = xen_pci_frontend_enable_msi(dev, &v);
	143	if (ret)
	144	goto error;
b5401a96 AN	145	i = 0;
	146	list_for_each_entry(msidesc, &dev->msi_list, list) {
	147	irq = xen_allocate_pirq(v[i], 0, /* not sharable */
	148	(type == PCI_CAP_ID_MSIX) ?
	149	"pcifront-msi-x" : "pcifront-msi");
07cf2a64 JS	150	if (irq < 0) {
	151	ret = -1;
	152	goto free;
	153	}
b5401a96 AN	154
	155	ret = set_irq_msi(irq, msidesc);
	156	if (ret)
	157	goto error_while;
	158	i++;
	159	}
	160	kfree(v);
	161	return 0;
	162
	163	error_while:
	164	unbind_from_irqhandler(irq, NULL);
	165	error:
	166	if (ret == -ENODEV)
	167	dev_err(&dev->dev, "Xen PCI frontend has not registered" \
	168	" MSI/MSI-X support!\n");
07cf2a64	169	free:
b5401a96 AN	170	kfree(v);
	171	return ret;
	172	}
	173
	174	static void xen_teardown_msi_irqs(struct pci_dev *dev)
	175	{
f731e3ef	176	struct msi_desc *msidesc;
b5401a96	177
f731e3ef QH	178	msidesc = list_entry(dev->msi_list.next, struct msi_desc, list);
	179	if (msidesc->msi_attrib.is_msix)
	180	xen_pci_frontend_disable_msix(dev);
	181	else
	182	xen_pci_frontend_disable_msi(dev);
b5401a96 AN	183	}
	184
	185	static void xen_teardown_msi_irq(unsigned int irq)
	186	{
	187	xen_destroy_irq(irq);
	188	}
f731e3ef QH	189
	190	static int xen_initdom_setup_msi_irqs(struct pci_dev *dev, int nvec, int type)
	191	{
	192	int irq, ret;
	193	struct msi_desc *msidesc;
	194
	195	list_for_each_entry(msidesc, &dev->msi_list, list) {
	196	irq = xen_create_msi_irq(dev, msidesc, type);
	197	if (irq < 0)
	198	return -1;
	199
	200	ret = set_irq_msi(irq, msidesc);
	201	if (ret)
	202	goto error;
	203	}
	204	return 0;
	205
	206	error:
	207	xen_destroy_irq(irq);
	208	return ret;
	209	}
b5401a96 AN	210	#endif
	211
	212	static int xen_pcifront_enable_irq(struct pci_dev *dev)
	213	{
	214	int rc;
	215	int share = 1;
	216
	217	dev_info(&dev->dev, "Xen PCI enabling IRQ: %d\n", dev->irq);
	218
	219	if (dev->irq < 0)
	220	return -EINVAL;
	221
	222	if (dev->irq < NR_IRQS_LEGACY)
	223	share = 0;
	224
	225	rc = xen_allocate_pirq(dev->irq, share, "pcifront");
	226	if (rc < 0) {
	227	dev_warn(&dev->dev, "Xen PCI IRQ: %d, failed to register:%d\n",
	228	dev->irq, rc);
	229	return rc;
	230	}
	231	return 0;
	232	}
	233
	234	int __init pci_xen_init(void)
	235	{
	236	if (!xen_pv_domain() \|\| xen_initial_domain())
	237	return -ENODEV;
	238
	239	printk(KERN_INFO "PCI: setting up Xen PCI frontend stub\n");
	240
	241	pcibios_set_cache_line_size();
	242
	243	pcibios_enable_irq = xen_pcifront_enable_irq;
	244	pcibios_disable_irq = NULL;
	245
	246	#ifdef CONFIG_ACPI
	247	/* Keep ACPI out of the picture */
	248	acpi_noirq = 1;
	249	#endif
	250
b5401a96 AN	251	#ifdef CONFIG_PCI_MSI
	252	x86_msi.setup_msi_irqs = xen_setup_msi_irqs;
	253	x86_msi.teardown_msi_irq = xen_teardown_msi_irq;
	254	x86_msi.teardown_msi_irqs = xen_teardown_msi_irqs;
	255	#endif
	256	return 0;
	257	}
3942b740 SS	258
	259	int __init pci_xen_hvm_init(void)
	260	{
	261	if (!xen_feature(XENFEAT_hvm_pirqs))
	262	return 0;
	263
	264	#ifdef CONFIG_ACPI
	265	/*
	266	* We don't want to change the actual ACPI delivery model,
	267	* just how GSIs get registered.
	268	*/
	269	__acpi_register_gsi = acpi_register_gsi_xen_hvm;
	270	#endif
809f9267 SS	271
	272	#ifdef CONFIG_PCI_MSI
	273	x86_msi.setup_msi_irqs = xen_hvm_setup_msi_irqs;
	274	x86_msi.teardown_msi_irq = xen_teardown_msi_irq;
	275	#endif
3942b740 SS	276	return 0;
3942b740 SS	277	}
38aa66fc JF	278
	279	#ifdef CONFIG_XEN_DOM0
	280	static int xen_register_pirq(u32 gsi, int triggering)
	281	{
	282	int rc, irq;
	283	struct physdev_map_pirq map_irq;
	284	int shareable = 0;
	285	char *name;
	286
	287	if (!xen_pv_domain())
	288	return -1;
	289
	290	if (triggering == ACPI_EDGE_SENSITIVE) {
	291	shareable = 0;
	292	name = "ioapic-edge";
	293	} else {
	294	shareable = 1;
	295	name = "ioapic-level";
	296	}
	297
	298	irq = xen_allocate_pirq(gsi, shareable, name);
	299
	300	printk(KERN_DEBUG "xen: --> irq=%d\n", irq);
	301
	302	if (irq < 0)
	303	goto out;
	304
	305	map_irq.domid = DOMID_SELF;
	306	map_irq.type = MAP_PIRQ_TYPE_GSI;
	307	map_irq.index = gsi;
	308	map_irq.pirq = irq;
	309
	310	rc = HYPERVISOR_physdev_op(PHYSDEVOP_map_pirq, &map_irq);
	311	if (rc) {
	312	printk(KERN_WARNING "xen map irq failed %d\n", rc);
	313	return -1;
	314	}
	315
	316	out:
	317	return irq;
	318	}
	319
	320	static int xen_register_gsi(u32 gsi, int triggering, int polarity)
	321	{
	322	int rc, irq;
	323	struct physdev_setup_gsi setup_gsi;
	324
	325	if (!xen_pv_domain())
	326	return -1;
	327
	328	printk(KERN_DEBUG "xen: registering gsi %u triggering %d polarity %d\n",
	329	gsi, triggering, polarity);
	330
	331	irq = xen_register_pirq(gsi, triggering);
	332
	333	setup_gsi.gsi = gsi;
	334	setup_gsi.triggering = (triggering == ACPI_EDGE_SENSITIVE ? 0 : 1);
	335	setup_gsi.polarity = (polarity == ACPI_ACTIVE_HIGH ? 0 : 1);
	336
	337	rc = HYPERVISOR_physdev_op(PHYSDEVOP_setup_gsi, &setup_gsi);
	338	if (rc == -EEXIST)
	339	printk(KERN_INFO "Already setup the GSI :%d\n", gsi);
	340	else if (rc) {
	341	printk(KERN_ERR "Failed to setup GSI :%d, err_code:%d\n",
342	gsi, rc);
343	}
344
345	return irq;
346	}
347
348	static __init void xen_setup_acpi_sci(void)
349	{
350	int rc;
351	int trigger, polarity;
352	int gsi = acpi_sci_override_gsi;
353
354	if (!gsi)
355	return;
356
357	rc = acpi_get_override_irq(gsi, &trigger, &polarity);
358	if (rc) {
359	printk(KERN_WARNING "xen: acpi_get_override_irq failed for acpi"
360	" sci, rc=%d\n", rc);
361	return;
362	}
363	trigger = trigger ? ACPI_LEVEL_SENSITIVE : ACPI_EDGE_SENSITIVE;
364	polarity = polarity ? ACPI_ACTIVE_LOW : ACPI_ACTIVE_HIGH;
365
366	printk(KERN_INFO "xen: sci override: global_irq=%d trigger=%d "
367	"polarity=%d\n", gsi, trigger, polarity);
368
369	gsi = xen_register_gsi(gsi, trigger, polarity);
370	printk(KERN_INFO "xen: acpi sci %d\n", gsi);
371
372	return;
373	}
374
375	static int acpi_register_gsi_xen(struct device *dev, u32 gsi,
376	int trigger, int polarity)
377	{
378	return xen_register_gsi(gsi, trigger, polarity);
379	}
380
381	static int __init pci_xen_initial_domain(void)
382	{
f731e3ef QH	383	#ifdef CONFIG_PCI_MSI
	384	x86_msi.setup_msi_irqs = xen_initdom_setup_msi_irqs;
	385	x86_msi.teardown_msi_irq = xen_teardown_msi_irq;
	386	#endif
38aa66fc JF	387	xen_setup_acpi_sci();
	388	__acpi_register_gsi = acpi_register_gsi_xen;
	389
	390	return 0;
	391	}
	392
	393	void __init xen_setup_pirqs(void)
	394	{
	395	int irq;
	396
	397	pci_xen_initial_domain();
	398
	399	if (0 == nr_ioapics) {
	400	for (irq = 0; irq < NR_IRQS_LEGACY; irq++)
	401	xen_allocate_pirq(irq, 0, "xt-pic");
	402	return;
	403	}
	404
	405	/* Pre-allocate legacy irqs */
	406	for (irq = 0; irq < NR_IRQS_LEGACY; irq++) {
	407	int trigger, polarity;
	408
	409	if (acpi_get_override_irq(irq, &trigger, &polarity) == -1)
	410	continue;
	411
	412	xen_register_pirq(irq,
	413	trigger ? ACPI_LEVEL_SENSITIVE : ACPI_EDGE_SENSITIVE);
	414	}
	415	}
	416	#endif