[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 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_map_pirq_gsi(map_irq.pirq, gsi, 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, ret = 0;
	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 (xen_irq_from_pirq(pirq) >= 0 && msg.data == XEN_PIRQ_MSI_DATA) {
			irq = xen_allocate_pirq_msi((type == PCI_CAP_ID_MSIX) ?
						    "msi-x" : "msi", &pirq, 0);
			if (irq < 0)
				goto error;
			ret = set_irq_msi(irq, msidesc);
			if (ret < 0)
				goto error_while;
			printk(KERN_DEBUG "xen: msi already setup: msi --> irq=%d"
					" pirq=%d\n", irq, pirq);
			return 0;
		}
		irq = xen_allocate_pirq_msi((type == PCI_CAP_ID_MSIX) ?
					    "msi-x" : "msi", &pirq, 1);
		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_msi(
			(type == PCI_CAP_ID_MSIX) ?
			"pcifront-msi-x" : "pcifront-msi",
			&v[i], 0);
		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);

	/* 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 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
#endif

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

	if (gsi < NR_IRQS_LEGACY)
		share = 0;

	rc = xen_allocate_pirq(gsi, share, "pcifront");
	if (rc < 0) {
		dev_warn(&dev->dev, "Xen PCI: failed to register GSI%d: %d\n",
			 gsi, 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 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	22	#ifdef CONFIG_ACPI
9a626612 IC	23	static int acpi_register_gsi_xen_hvm(struct device *dev, u32 gsi,
9a626612 IC	24	int trigger, int polarity)
42a1de56 SS	25	{
	26	int rc, irq;
	27	struct physdev_map_pirq map_irq;
	28	int shareable = 0;
	29	char *name;
	30
	31	if (!xen_hvm_domain())
	32	return -1;
	33
	34	map_irq.domid = DOMID_SELF;
	35	map_irq.type = MAP_PIRQ_TYPE_GSI;
	36	map_irq.index = gsi;
	37	map_irq.pirq = -1;
	38
	39	rc = HYPERVISOR_physdev_op(PHYSDEVOP_map_pirq, &map_irq);
	40	if (rc) {
	41	printk(KERN_WARNING "xen map irq failed %d\n", rc);
	42	return -1;
	43	}
	44
9a626612	45	if (trigger == ACPI_EDGE_SENSITIVE) {
42a1de56 SS	46	shareable = 0;
	47	name = "ioapic-edge";
	48	} else {
	49	shareable = 1;
	50	name = "ioapic-level";
	51	}
	52
	53	irq = xen_map_pirq_gsi(map_irq.pirq, gsi, shareable, name);
	54
	55	printk(KERN_DEBUG "xen: --> irq=%d, pirq=%d\n", irq, map_irq.pirq);
	56
	57	return irq;
	58	}
	59	#endif
	60
b5401a96 AN	61	#if defined(CONFIG_PCI_MSI)
b5401a96 AN	62	#include <linux/msi.h>
809f9267	63	#include <asm/msidef.h>
b5401a96 AN	64
	65	struct xen_pci_frontend_ops *xen_pci_frontend;
	66	EXPORT_SYMBOL_GPL(xen_pci_frontend);
	67
af42b8d1 SS	68	#define XEN_PIRQ_MSI_DATA (MSI_DATA_TRIGGER_EDGE \| \
	69	MSI_DATA_LEVEL_ASSERT \| (3 << 8) \| MSI_DATA_VECTOR(0))
	70
809f9267 SS	71	static void xen_msi_compose_msg(struct pci_dev *pdev, unsigned int pirq,
	72	struct msi_msg *msg)
	73	{
	74	/* We set vector == 0 to tell the hypervisor we don't care about it,
	75	* but we want a pirq setup instead.
	76	* We use the dest_id field to pass the pirq that we want. */
	77	msg->address_hi = MSI_ADDR_BASE_HI \| MSI_ADDR_EXT_DEST_ID(pirq);
	78	msg->address_lo =
	79	MSI_ADDR_BASE_LO \|
	80	MSI_ADDR_DEST_MODE_PHYSICAL \|
	81	MSI_ADDR_REDIRECTION_CPU \|
	82	MSI_ADDR_DEST_ID(pirq);
	83
af42b8d1	84	msg->data = XEN_PIRQ_MSI_DATA;
809f9267 SS	85	}
	86
	87	static int xen_hvm_setup_msi_irqs(struct pci_dev *dev, int nvec, int type)
	88	{
	89	int irq, pirq, ret = 0;
	90	struct msi_desc *msidesc;
	91	struct msi_msg msg;
	92
	93	list_for_each_entry(msidesc, &dev->msi_list, list) {
af42b8d1 SS	94	__read_msi_msg(msidesc, &msg);
	95	pirq = MSI_ADDR_EXT_DEST_ID(msg.address_hi) \|
	96	((msg.address_lo >> MSI_ADDR_DEST_ID_SHIFT) & 0xff);
	97	if (xen_irq_from_pirq(pirq) >= 0 && msg.data == XEN_PIRQ_MSI_DATA) {
4b41df7f IC	98	irq = xen_allocate_pirq_msi((type == PCI_CAP_ID_MSIX) ?
4b41df7f IC	99	"msi-x" : "msi", &pirq, 0);
af42b8d1 SS	100	if (irq < 0)
	101	goto error;
	102	ret = set_irq_msi(irq, msidesc);
	103	if (ret < 0)
	104	goto error_while;
	105	printk(KERN_DEBUG "xen: msi already setup: msi --> irq=%d"
	106	" pirq=%d\n", irq, pirq);
	107	return 0;
	108	}
4b41df7f IC	109	irq = xen_allocate_pirq_msi((type == PCI_CAP_ID_MSIX) ?
4b41df7f IC	110	"msi-x" : "msi", &pirq, 1);
809f9267 SS	111	if (irq < 0 \|\| pirq < 0)
	112	goto error;
	113	printk(KERN_DEBUG "xen: msi --> irq=%d, pirq=%d\n", irq, pirq);
	114	xen_msi_compose_msg(dev, pirq, &msg);
	115	ret = set_irq_msi(irq, msidesc);
	116	if (ret < 0)
	117	goto error_while;
	118	write_msi_msg(irq, &msg);
	119	}
	120	return 0;
	121
	122	error_while:
	123	unbind_from_irqhandler(irq, NULL);
	124	error:
	125	if (ret == -ENODEV)
	126	dev_err(&dev->dev, "Xen PCI frontend has not registered" \
	127	" MSI/MSI-X support!\n");
	128
	129	return ret;
	130	}
	131
b5401a96 AN	132	/*
	133	* For MSI interrupts we have to use drivers/xen/event.s functions to
	134	* allocate an irq_desc and setup the right */
	135
	136
	137	static int xen_setup_msi_irqs(struct pci_dev *dev, int nvec, int type)
	138	{
	139	int irq, ret, i;
	140	struct msi_desc *msidesc;
	141	int *v;
	142
	143	v = kzalloc(sizeof(int) * max(1, nvec), GFP_KERNEL);
	144	if (!v)
	145	return -ENOMEM;
	146
f731e3ef	147	if (type == PCI_CAP_ID_MSIX)
cc0f89c4	148	ret = xen_pci_frontend_enable_msix(dev, v, nvec);
f731e3ef	149	else
cc0f89c4	150	ret = xen_pci_frontend_enable_msi(dev, v);
f731e3ef QH	151	if (ret)
f731e3ef QH	152	goto error;
b5401a96 AN	153	i = 0;
b5401a96 AN	154	list_for_each_entry(msidesc, &dev->msi_list, list) {
4b41df7f	155	irq = xen_allocate_pirq_msi(
b5401a96	156	(type == PCI_CAP_ID_MSIX) ?
55cb8cd4	157	"pcifront-msi-x" : "pcifront-msi",
4b41df7f	158	&v[i], 0);
07cf2a64 JS	159	if (irq < 0) {
	160	ret = -1;
	161	goto free;
	162	}
b5401a96 AN	163	ret = set_irq_msi(irq, msidesc);
	164	if (ret)
	165	goto error_while;
	166	i++;
	167	}
	168	kfree(v);
	169	return 0;
	170
	171	error_while:
	172	unbind_from_irqhandler(irq, NULL);
	173	error:
	174	if (ret == -ENODEV)
	175	dev_err(&dev->dev, "Xen PCI frontend has not registered" \
	176	" MSI/MSI-X support!\n");
07cf2a64	177	free:
b5401a96 AN	178	kfree(v);
	179	return ret;
	180	}
	181
	182	static void xen_teardown_msi_irqs(struct pci_dev *dev)
	183	{
f731e3ef	184	struct msi_desc *msidesc;
b5401a96	185
f731e3ef QH	186	msidesc = list_entry(dev->msi_list.next, struct msi_desc, list);
	187	if (msidesc->msi_attrib.is_msix)
	188	xen_pci_frontend_disable_msix(dev);
	189	else
	190	xen_pci_frontend_disable_msi(dev);
3d74a539 KRW	191
	192	/* Free the IRQ's and the msidesc using the generic code. */
	193	default_teardown_msi_irqs(dev);
b5401a96 AN	194	}
	195
	196	static void xen_teardown_msi_irq(unsigned int irq)
	197	{
	198	xen_destroy_irq(irq);
	199	}
f731e3ef	200
260a7d4c	201	#ifdef CONFIG_XEN_DOM0
f731e3ef QH	202	static int xen_initdom_setup_msi_irqs(struct pci_dev *dev, int nvec, int type)
	203	{
	204	int irq, ret;
	205	struct msi_desc *msidesc;
	206
	207	list_for_each_entry(msidesc, &dev->msi_list, list) {
	208	irq = xen_create_msi_irq(dev, msidesc, type);
	209	if (irq < 0)
	210	return -1;
	211
	212	ret = set_irq_msi(irq, msidesc);
	213	if (ret)
	214	goto error;
	215	}
	216	return 0;
	217
	218	error:
	219	xen_destroy_irq(irq);
	220	return ret;
	221	}
b5401a96	222	#endif
260a7d4c	223	#endif
b5401a96 AN	224
	225	static int xen_pcifront_enable_irq(struct pci_dev *dev)
	226	{
	227	int rc;
	228	int share = 1;
3f2a230c	229	u8 gsi;
b5401a96	230
3f2a230c IC	231	rc = pci_read_config_byte(dev, PCI_INTERRUPT_LINE, &gsi);
	232	if (rc < 0) {
	233	dev_warn(&dev->dev, "Xen PCI: failed to read interrupt line: %d\n",
	234	rc);
	235	return rc;
	236	}
b5401a96	237
3f2a230c	238	if (gsi < NR_IRQS_LEGACY)
b5401a96 AN	239	share = 0;
b5401a96 AN	240
3f2a230c	241	rc = xen_allocate_pirq(gsi, share, "pcifront");
b5401a96	242	if (rc < 0) {
3f2a230c IC	243	dev_warn(&dev->dev, "Xen PCI: failed to register GSI%d: %d\n",
3f2a230c IC	244	gsi, rc);
b5401a96 AN	245	return rc;
b5401a96 AN	246	}
3f2a230c IC	247
	248	dev->irq = rc;
	249	dev_info(&dev->dev, "Xen PCI mapped GSI%d to IRQ%d\n", gsi, dev->irq);
b5401a96 AN	250	return 0;
	251	}
	252
	253	int __init pci_xen_init(void)
	254	{
	255	if (!xen_pv_domain() \|\| xen_initial_domain())
	256	return -ENODEV;
	257
	258	printk(KERN_INFO "PCI: setting up Xen PCI frontend stub\n");
	259
	260	pcibios_set_cache_line_size();
	261
	262	pcibios_enable_irq = xen_pcifront_enable_irq;
	263	pcibios_disable_irq = NULL;
	264
	265	#ifdef CONFIG_ACPI
	266	/* Keep ACPI out of the picture */
	267	acpi_noirq = 1;
	268	#endif
	269
b5401a96 AN	270	#ifdef CONFIG_PCI_MSI
	271	x86_msi.setup_msi_irqs = xen_setup_msi_irqs;
	272	x86_msi.teardown_msi_irq = xen_teardown_msi_irq;
	273	x86_msi.teardown_msi_irqs = xen_teardown_msi_irqs;
	274	#endif
	275	return 0;
	276	}
3942b740 SS	277
	278	int __init pci_xen_hvm_init(void)
	279	{
	280	if (!xen_feature(XENFEAT_hvm_pirqs))
	281	return 0;
	282
	283	#ifdef CONFIG_ACPI
	284	/*
	285	* We don't want to change the actual ACPI delivery model,
	286	* just how GSIs get registered.
	287	*/
	288	__acpi_register_gsi = acpi_register_gsi_xen_hvm;
	289	#endif
809f9267 SS	290
	291	#ifdef CONFIG_PCI_MSI
	292	x86_msi.setup_msi_irqs = xen_hvm_setup_msi_irqs;
	293	x86_msi.teardown_msi_irq = xen_teardown_msi_irq;
	294	#endif
3942b740 SS	295	return 0;
3942b740 SS	296	}
38aa66fc JF	297
	298	#ifdef CONFIG_XEN_DOM0
	299	static int xen_register_pirq(u32 gsi, int triggering)
	300	{
	301	int rc, irq;
	302	struct physdev_map_pirq map_irq;
	303	int shareable = 0;
	304	char *name;
	305
	306	if (!xen_pv_domain())
	307	return -1;
	308
	309	if (triggering == ACPI_EDGE_SENSITIVE) {
	310	shareable = 0;
	311	name = "ioapic-edge";
	312	} else {
	313	shareable = 1;
	314	name = "ioapic-level";
	315	}
	316
	317	irq = xen_allocate_pirq(gsi, shareable, name);
	318
	319	printk(KERN_DEBUG "xen: --> irq=%d\n", irq);
	320
	321	if (irq < 0)
	322	goto out;
	323
	324	map_irq.domid = DOMID_SELF;
	325	map_irq.type = MAP_PIRQ_TYPE_GSI;
	326	map_irq.index = gsi;
	327	map_irq.pirq = irq;
	328
	329	rc = HYPERVISOR_physdev_op(PHYSDEVOP_map_pirq, &map_irq);
	330	if (rc) {
	331	printk(KERN_WARNING "xen map irq failed %d\n", rc);
	332	return -1;
	333	}
	334
	335	out:
	336	return irq;
	337	}
	338
	339	static int xen_register_gsi(u32 gsi, int triggering, int polarity)
	340	{
	341	int rc, irq;
	342	struct physdev_setup_gsi setup_gsi;
	343
	344	if (!xen_pv_domain())
	345	return -1;
	346
	347	printk(KERN_DEBUG "xen: registering gsi %u triggering %d polarity %d\n",
	348	gsi, triggering, polarity);
	349
	350	irq = xen_register_pirq(gsi, triggering);
	351
	352	setup_gsi.gsi = gsi;
	353	setup_gsi.triggering = (triggering == ACPI_EDGE_SENSITIVE ? 0 : 1);
	354	setup_gsi.polarity = (polarity == ACPI_ACTIVE_HIGH ? 0 : 1);
	355
	356	rc = HYPERVISOR_physdev_op(PHYSDEVOP_setup_gsi, &setup_gsi);
	357	if (rc == -EEXIST)
	358	printk(KERN_INFO "Already setup the GSI :%d\n", gsi);
	359	else if (rc) {
	360	printk(KERN_ERR "Failed to setup GSI :%d, err_code:%d\n",
361	gsi, rc);
362	}
363
364	return irq;
365	}
366
367	static __init void xen_setup_acpi_sci(void)
368	{
369	int rc;
370	int trigger, polarity;
371	int gsi = acpi_sci_override_gsi;
372
373	if (!gsi)
374	return;
375
376	rc = acpi_get_override_irq(gsi, &trigger, &polarity);
377	if (rc) {
378	printk(KERN_WARNING "xen: acpi_get_override_irq failed for acpi"
379	" sci, rc=%d\n", rc);
380	return;
381	}
382	trigger = trigger ? ACPI_LEVEL_SENSITIVE : ACPI_EDGE_SENSITIVE;
383	polarity = polarity ? ACPI_ACTIVE_LOW : ACPI_ACTIVE_HIGH;
384
385	printk(KERN_INFO "xen: sci override: global_irq=%d trigger=%d "
386	"polarity=%d\n", gsi, trigger, polarity);
387
388	gsi = xen_register_gsi(gsi, trigger, polarity);
389	printk(KERN_INFO "xen: acpi sci %d\n", gsi);
390
391	return;
392	}
393
394	static int acpi_register_gsi_xen(struct device *dev, u32 gsi,
395	int trigger, int polarity)
396	{
397	return xen_register_gsi(gsi, trigger, polarity);
398	}
399
400	static int __init pci_xen_initial_domain(void)
401	{
f731e3ef QH	402	#ifdef CONFIG_PCI_MSI
	403	x86_msi.setup_msi_irqs = xen_initdom_setup_msi_irqs;
	404	x86_msi.teardown_msi_irq = xen_teardown_msi_irq;
	405	#endif
38aa66fc JF	406	xen_setup_acpi_sci();
	407	__acpi_register_gsi = acpi_register_gsi_xen;
	408
	409	return 0;
	410	}
	411
	412	void __init xen_setup_pirqs(void)
	413	{
	414	int irq;
	415
	416	pci_xen_initial_domain();
	417
	418	if (0 == nr_ioapics) {
	419	for (irq = 0; irq < NR_IRQS_LEGACY; irq++)
	420	xen_allocate_pirq(irq, 0, "xt-pic");
	421	return;
	422	}
	423
	424	/* Pre-allocate legacy irqs */
	425	for (irq = 0; irq < NR_IRQS_LEGACY; irq++) {
	426	int trigger, polarity;
	427
	428	if (acpi_get_override_irq(irq, &trigger, &polarity) == -1)
	429	continue;
	430
	431	xen_register_pirq(irq,
	432	trigger ? ACPI_LEVEL_SENSITIVE : ACPI_EDGE_SENSITIVE);
	433	}
	434	}
	435	#endif