[GitHub/mt8127/android_kernel_alcatel_ttab.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_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
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
f4d0635b	53	irq = xen_bind_pirq_gsi_to_irq(gsi, map_irq.pirq, shareable, name);
42a1de56 SS	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	{
bf480d95	89	int irq, pirq;
809f9267 SS	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);
bf480d95 IC	97	if (msg.data != XEN_PIRQ_MSI_DATA \|\|
	98	xen_irq_from_pirq(pirq) < 0) {
	99	pirq = xen_allocate_pirq_msi(dev, msidesc);
	100	if (pirq < 0)
af42b8d1	101	goto error;
bf480d95 IC	102	xen_msi_compose_msg(dev, pirq, &msg);
	103	__write_msi_msg(msidesc, &msg);
	104	dev_dbg(&dev->dev, "xen: msi bound to pirq=%d\n", pirq);
	105	} else {
	106	dev_dbg(&dev->dev,
	107	"xen: msi already bound to pirq=%d\n", pirq);
af42b8d1	108	}
ca1d8fe9	109	irq = xen_bind_pirq_msi_to_irq(dev, msidesc, pirq, 0,
bf480d95	110	(type == PCI_CAP_ID_MSIX) ?
beafbdc1 KRW	111	"msi-x" : "msi",
beafbdc1 KRW	112	DOMID_SELF);
bf480d95	113	if (irq < 0)
809f9267	114	goto error;
bf480d95 IC	115	dev_dbg(&dev->dev,
bf480d95 IC	116	"xen: msi --> pirq=%d --> irq=%d\n", pirq, irq);
809f9267 SS	117	}
	118	return 0;
	119
809f9267	120	error:
bf480d95 IC	121	dev_err(&dev->dev,
	122	"Xen PCI frontend has not registered MSI/MSI-X support!\n");
	123	return -ENODEV;
809f9267 SS	124	}
809f9267 SS	125
b5401a96 AN	126	/*
	127	* For MSI interrupts we have to use drivers/xen/event.s functions to
	128	* allocate an irq_desc and setup the right */
	129
	130
	131	static int xen_setup_msi_irqs(struct pci_dev *dev, int nvec, int type)
	132	{
	133	int irq, ret, i;
	134	struct msi_desc *msidesc;
	135	int *v;
	136
	137	v = kzalloc(sizeof(int) * max(1, nvec), GFP_KERNEL);
	138	if (!v)
	139	return -ENOMEM;
	140
f731e3ef	141	if (type == PCI_CAP_ID_MSIX)
cc0f89c4	142	ret = xen_pci_frontend_enable_msix(dev, v, nvec);
f731e3ef	143	else
cc0f89c4	144	ret = xen_pci_frontend_enable_msi(dev, v);
f731e3ef QH	145	if (ret)
f731e3ef QH	146	goto error;
b5401a96 AN	147	i = 0;
b5401a96 AN	148	list_for_each_entry(msidesc, &dev->msi_list, list) {
ca1d8fe9	149	irq = xen_bind_pirq_msi_to_irq(dev, msidesc, v[i], 0,
bf480d95 IC	150	(type == PCI_CAP_ID_MSIX) ?
bf480d95 IC	151	"pcifront-msi-x" :
beafbdc1 KRW	152	"pcifront-msi",
beafbdc1 KRW	153	DOMID_SELF);
bf480d95	154	if (irq < 0)
07cf2a64	155	goto free;
b5401a96 AN	156	i++;
	157	}
	158	kfree(v);
	159	return 0;
	160
b5401a96	161	error:
bf480d95	162	dev_err(&dev->dev, "Xen PCI frontend has not registered MSI/MSI-X support!\n");
07cf2a64	163	free:
b5401a96 AN	164	kfree(v);
	165	return ret;
	166	}
	167
	168	static void xen_teardown_msi_irqs(struct pci_dev *dev)
	169	{
f731e3ef	170	struct msi_desc *msidesc;
b5401a96	171
f731e3ef QH	172	msidesc = list_entry(dev->msi_list.next, struct msi_desc, list);
	173	if (msidesc->msi_attrib.is_msix)
	174	xen_pci_frontend_disable_msix(dev);
	175	else
	176	xen_pci_frontend_disable_msi(dev);
3d74a539 KRW	177
	178	/* Free the IRQ's and the msidesc using the generic code. */
	179	default_teardown_msi_irqs(dev);
b5401a96 AN	180	}
	181
	182	static void xen_teardown_msi_irq(unsigned int irq)
	183	{
	184	xen_destroy_irq(irq);
	185	}
f731e3ef	186
260a7d4c	187	#ifdef CONFIG_XEN_DOM0
f731e3ef QH	188	static int xen_initdom_setup_msi_irqs(struct pci_dev *dev, int nvec, int type)
f731e3ef QH	189	{
71eef7d1	190	int ret = 0;
f731e3ef QH	191	struct msi_desc *msidesc;
	192
	193	list_for_each_entry(msidesc, &dev->msi_list, list) {
71eef7d1	194	struct physdev_map_pirq map_irq;
beafbdc1 KRW	195	domid_t domid;
	196
	197	domid = ret = xen_find_device_domain_owner(dev);
	198	/* N.B. Casting int's -ENODEV to uint16_t results in 0xFFED,
	199	* hence check ret value for < 0. */
	200	if (ret < 0)
	201	domid = DOMID_SELF;
71eef7d1 IC	202
71eef7d1 IC	203	memset(&map_irq, 0, sizeof(map_irq));
beafbdc1	204	map_irq.domid = domid;
71eef7d1 IC	205	map_irq.type = MAP_PIRQ_TYPE_MSI;
	206	map_irq.index = -1;
	207	map_irq.pirq = -1;
	208	map_irq.bus = dev->bus->number;
	209	map_irq.devfn = dev->devfn;
	210
	211	if (type == PCI_CAP_ID_MSIX) {
	212	int pos;
	213	u32 table_offset, bir;
	214
	215	pos = pci_find_capability(dev, PCI_CAP_ID_MSIX);
	216
	217	pci_read_config_dword(dev, pos + PCI_MSIX_TABLE,
	218	&table_offset);
	219	bir = (u8)(table_offset & PCI_MSIX_FLAGS_BIRMASK);
	220
	221	map_irq.table_base = pci_resource_start(dev, bir);
	222	map_irq.entry_nr = msidesc->msi_attrib.entry_nr;
	223	}
	224
	225	ret = HYPERVISOR_physdev_op(PHYSDEVOP_map_pirq, &map_irq);
	226	if (ret) {
beafbdc1 KRW	227	dev_warn(&dev->dev, "xen map irq failed %d for %d domain\n",
beafbdc1 KRW	228	ret, domid);
71eef7d1 IC	229	goto out;
	230	}
	231
	232	ret = xen_bind_pirq_msi_to_irq(dev, msidesc,
	233	map_irq.pirq, map_irq.index,
	234	(type == PCI_CAP_ID_MSIX) ?
beafbdc1 KRW	235	"msi-x" : "msi",
beafbdc1 KRW	236	domid);
71eef7d1 IC	237	if (ret < 0)
71eef7d1 IC	238	goto out;
f731e3ef	239	}
71eef7d1 IC	240	ret = 0;
	241	out:
	242	return ret;
f731e3ef	243	}
b5401a96	244	#endif
260a7d4c	245	#endif
b5401a96 AN	246
	247	static int xen_pcifront_enable_irq(struct pci_dev *dev)
	248	{
	249	int rc;
	250	int share = 1;
f4d0635b	251	int pirq;
3f2a230c	252	u8 gsi;
b5401a96	253
3f2a230c IC	254	rc = pci_read_config_byte(dev, PCI_INTERRUPT_LINE, &gsi);
	255	if (rc < 0) {
	256	dev_warn(&dev->dev, "Xen PCI: failed to read interrupt line: %d\n",
	257	rc);
	258	return rc;
	259	}
b5401a96	260
f4d0635b IC	261	rc = xen_allocate_pirq_gsi(gsi);
	262	if (rc < 0) {
	263	dev_warn(&dev->dev, "Xen PCI: failed to allocate a PIRQ for GSI%d: %d\n",
	264	gsi, rc);
	265	return rc;
	266	}
	267	pirq = rc;
	268
3f2a230c	269	if (gsi < NR_IRQS_LEGACY)
b5401a96 AN	270	share = 0;
b5401a96 AN	271
f4d0635b	272	rc = xen_bind_pirq_gsi_to_irq(gsi, pirq, share, "pcifront");
b5401a96	273	if (rc < 0) {
f4d0635b IC	274	dev_warn(&dev->dev, "Xen PCI: failed to bind GSI%d (PIRQ%d) to IRQ: %d\n",
f4d0635b IC	275	gsi, pirq, rc);
b5401a96 AN	276	return rc;
b5401a96 AN	277	}
3f2a230c IC	278
	279	dev->irq = rc;
	280	dev_info(&dev->dev, "Xen PCI mapped GSI%d to IRQ%d\n", gsi, dev->irq);
b5401a96 AN	281	return 0;
	282	}
	283
	284	int __init pci_xen_init(void)
	285	{
	286	if (!xen_pv_domain() \|\| xen_initial_domain())
	287	return -ENODEV;
	288
	289	printk(KERN_INFO "PCI: setting up Xen PCI frontend stub\n");
	290
	291	pcibios_set_cache_line_size();
	292
	293	pcibios_enable_irq = xen_pcifront_enable_irq;
	294	pcibios_disable_irq = NULL;
	295
	296	#ifdef CONFIG_ACPI
	297	/* Keep ACPI out of the picture */
	298	acpi_noirq = 1;
	299	#endif
	300
b5401a96 AN	301	#ifdef CONFIG_PCI_MSI
	302	x86_msi.setup_msi_irqs = xen_setup_msi_irqs;
	303	x86_msi.teardown_msi_irq = xen_teardown_msi_irq;
	304	x86_msi.teardown_msi_irqs = xen_teardown_msi_irqs;
	305	#endif
	306	return 0;
	307	}
3942b740 SS	308
	309	int __init pci_xen_hvm_init(void)
	310	{
	311	if (!xen_feature(XENFEAT_hvm_pirqs))
	312	return 0;
	313
	314	#ifdef CONFIG_ACPI
	315	/*
	316	* We don't want to change the actual ACPI delivery model,
	317	* just how GSIs get registered.
	318	*/
	319	__acpi_register_gsi = acpi_register_gsi_xen_hvm;
	320	#endif
809f9267 SS	321
	322	#ifdef CONFIG_PCI_MSI
	323	x86_msi.setup_msi_irqs = xen_hvm_setup_msi_irqs;
	324	x86_msi.teardown_msi_irq = xen_teardown_msi_irq;
	325	#endif
3942b740 SS	326	return 0;
3942b740 SS	327	}
38aa66fc JF	328
38aa66fc JF	329	#ifdef CONFIG_XEN_DOM0
ee339fe6	330	static int xen_register_pirq(u32 gsi, int gsi_override, int triggering)
38aa66fc	331	{
f4d0635b	332	int rc, pirq, irq = -1;
38aa66fc JF	333	struct physdev_map_pirq map_irq;
	334	int shareable = 0;
	335	char *name;
	336
	337	if (!xen_pv_domain())
	338	return -1;
	339
	340	if (triggering == ACPI_EDGE_SENSITIVE) {
	341	shareable = 0;
	342	name = "ioapic-edge";
	343	} else {
	344	shareable = 1;
	345	name = "ioapic-level";
	346	}
f4d0635b IC	347	pirq = xen_allocate_pirq_gsi(gsi);
	348	if (pirq < 0)
	349	goto out;
38aa66fc	350
ee339fe6 KRW	351	if (gsi_override >= 0)
ee339fe6 KRW	352	irq = xen_bind_pirq_gsi_to_irq(gsi_override, pirq, shareable, name);
155a16f2 KRW	353	else
155a16f2 KRW	354	irq = xen_bind_pirq_gsi_to_irq(gsi, pirq, shareable, name);
38aa66fc JF	355	if (irq < 0)
	356	goto out;
	357
155a16f2	358	printk(KERN_DEBUG "xen: --> pirq=%d -> irq=%d (gsi=%d)\n", pirq, irq, gsi);
f4d0635b	359
38aa66fc JF	360	map_irq.domid = DOMID_SELF;
	361	map_irq.type = MAP_PIRQ_TYPE_GSI;
	362	map_irq.index = gsi;
f4d0635b	363	map_irq.pirq = pirq;
38aa66fc JF	364
	365	rc = HYPERVISOR_physdev_op(PHYSDEVOP_map_pirq, &map_irq);
	366	if (rc) {
	367	printk(KERN_WARNING "xen map irq failed %d\n", rc);
	368	return -1;
	369	}
	370
	371	out:
	372	return irq;
	373	}
	374
ee339fe6	375	static int xen_register_gsi(u32 gsi, int gsi_override, int triggering, int polarity)
38aa66fc JF	376	{
	377	int rc, irq;
	378	struct physdev_setup_gsi setup_gsi;
	379
	380	if (!xen_pv_domain())
	381	return -1;
	382
	383	printk(KERN_DEBUG "xen: registering gsi %u triggering %d polarity %d\n",
	384	gsi, triggering, polarity);
	385
ee339fe6	386	irq = xen_register_pirq(gsi, gsi_override, triggering);
38aa66fc JF	387
	388	setup_gsi.gsi = gsi;
	389	setup_gsi.triggering = (triggering == ACPI_EDGE_SENSITIVE ? 0 : 1);
	390	setup_gsi.polarity = (polarity == ACPI_ACTIVE_HIGH ? 0 : 1);
	391
	392	rc = HYPERVISOR_physdev_op(PHYSDEVOP_setup_gsi, &setup_gsi);
	393	if (rc == -EEXIST)
	394	printk(KERN_INFO "Already setup the GSI :%d\n", gsi);
	395	else if (rc) {
	396	printk(KERN_ERR "Failed to setup GSI :%d, err_code:%d\n",
	397	gsi, rc);
	398	}
	399
	400	return irq;
	401	}
	402
	403	static __init void xen_setup_acpi_sci(void)
	404	{
	405	int rc;
	406	int trigger, polarity;
	407	int gsi = acpi_sci_override_gsi;
ee339fe6 KRW	408	int irq = -1;
ee339fe6 KRW	409	int gsi_override = -1;
38aa66fc JF	410
	411	if (!gsi)
	412	return;
	413
	414	rc = acpi_get_override_irq(gsi, &trigger, &polarity);
	415	if (rc) {
	416	printk(KERN_WARNING "xen: acpi_get_override_irq failed for acpi"
	417	" sci, rc=%d\n", rc);
	418	return;
	419	}
	420	trigger = trigger ? ACPI_LEVEL_SENSITIVE : ACPI_EDGE_SENSITIVE;
	421	polarity = polarity ? ACPI_ACTIVE_LOW : ACPI_ACTIVE_HIGH;
	422
	423	printk(KERN_INFO "xen: sci override: global_irq=%d trigger=%d "
	424	"polarity=%d\n", gsi, trigger, polarity);
	425
ee339fe6 KRW	426	/* Before we bind the GSI to a Linux IRQ, check whether
	427	* we need to override it with bus_irq (IRQ) value. Usually for
	428	* IRQs below IRQ_LEGACY_IRQ this holds IRQ == GSI, as so:
	429	* ACPI: INT_SRC_OVR (bus 0 bus_irq 9 global_irq 9 low level)
	430	* but there are oddballs where the IRQ != GSI:
	431	* ACPI: INT_SRC_OVR (bus 0 bus_irq 9 global_irq 20 low level)
	432	* which ends up being: gsi_to_irq[9] == 20
	433	* (which is what acpi_gsi_to_irq ends up calling when starting the
	434	* the ACPI interpreter and keels over since IRQ 9 has not been
	435	* setup as we had setup IRQ 20 for it).
	436	*/
	437	/* Check whether the GSI != IRQ */
	438	if (acpi_gsi_to_irq(gsi, &irq) == 0) {
	439	if (irq >= 0 && irq != gsi)
	440	/* Bugger, we MUST have that IRQ. */
	441	gsi_override = irq;
	442	}
	443
	444	gsi = xen_register_gsi(gsi, gsi_override, trigger, polarity);
38aa66fc JF	445	printk(KERN_INFO "xen: acpi sci %d\n", gsi);
	446
	447	return;
	448	}
	449
	450	static int acpi_register_gsi_xen(struct device *dev, u32 gsi,
	451	int trigger, int polarity)
	452	{
ee339fe6	453	return xen_register_gsi(gsi, -1 /* no GSI override */, trigger, polarity);
38aa66fc JF	454	}
	455
	456	static int __init pci_xen_initial_domain(void)
	457	{
f731e3ef QH	458	#ifdef CONFIG_PCI_MSI
	459	x86_msi.setup_msi_irqs = xen_initdom_setup_msi_irqs;
	460	x86_msi.teardown_msi_irq = xen_teardown_msi_irq;
	461	#endif
38aa66fc JF	462	xen_setup_acpi_sci();
	463	__acpi_register_gsi = acpi_register_gsi_xen;
	464
	465	return 0;
	466	}
	467
	468	void __init xen_setup_pirqs(void)
	469	{
f4d0635b	470	int pirq, irq;
38aa66fc JF	471
	472	pci_xen_initial_domain();
	473
	474	if (0 == nr_ioapics) {
f4d0635b IC	475	for (irq = 0; irq < NR_IRQS_LEGACY; irq++) {
	476	pirq = xen_allocate_pirq_gsi(irq);
	477	if (WARN(pirq < 0,
	478	"Could not allocate PIRQ for legacy interrupt\n"))
	479	break;
	480	irq = xen_bind_pirq_gsi_to_irq(irq, pirq, 0, "xt-pic");
	481	}
38aa66fc JF	482	return;
	483	}
	484
	485	/* Pre-allocate legacy irqs */
	486	for (irq = 0; irq < NR_IRQS_LEGACY; irq++) {
	487	int trigger, polarity;
	488
	489	if (acpi_get_override_irq(irq, &trigger, &polarity) == -1)
	490	continue;
	491
ee339fe6	492	xen_register_pirq(irq, -1 /* no GSI override */,
38aa66fc JF	493	trigger ? ACPI_LEVEL_SENSITIVE : ACPI_EDGE_SENSITIVE);
	494	}
	495	}
	496	#endif
c55fa78b	497
7c1bfd68	498	#ifdef CONFIG_XEN_DOM0
c55fa78b KRW	499	struct xen_device_domain_owner {
	500	domid_t domain;
	501	struct pci_dev *dev;
	502	struct list_head list;
	503	};
	504
	505	static DEFINE_SPINLOCK(dev_domain_list_spinlock);
	506	static struct list_head dev_domain_list = LIST_HEAD_INIT(dev_domain_list);
	507
	508	static struct xen_device_domain_owner find_device(struct pci_dev dev)
	509	{
	510	struct xen_device_domain_owner *owner;
	511
	512	list_for_each_entry(owner, &dev_domain_list, list) {
	513	if (owner->dev == dev)
	514	return owner;
	515	}
	516	return NULL;
	517	}
	518
	519	int xen_find_device_domain_owner(struct pci_dev *dev)
	520	{
	521	struct xen_device_domain_owner *owner;
	522	int domain = -ENODEV;
	523
	524	spin_lock(&dev_domain_list_spinlock);
	525	owner = find_device(dev);
	526	if (owner)
	527	domain = owner->domain;
	528	spin_unlock(&dev_domain_list_spinlock);
	529	return domain;
	530	}
	531	EXPORT_SYMBOL_GPL(xen_find_device_domain_owner);
	532
	533	int xen_register_device_domain_owner(struct pci_dev *dev, uint16_t domain)
	534	{
	535	struct xen_device_domain_owner *owner;
	536
	537	owner = kzalloc(sizeof(struct xen_device_domain_owner), GFP_KERNEL);
	538	if (!owner)
	539	return -ENODEV;
	540
	541	spin_lock(&dev_domain_list_spinlock);
	542	if (find_device(dev)) {
	543	spin_unlock(&dev_domain_list_spinlock);
	544	kfree(owner);
	545	return -EEXIST;
	546	}
	547	owner->domain = domain;
	548	owner->dev = dev;
	549	list_add_tail(&owner->list, &dev_domain_list);
	550	spin_unlock(&dev_domain_list_spinlock);
	551	return 0;
	552	}
	553	EXPORT_SYMBOL_GPL(xen_register_device_domain_owner);
	554
	555	int xen_unregister_device_domain_owner(struct pci_dev *dev)
	556	{
	557	struct xen_device_domain_owner *owner;
	558
	559	spin_lock(&dev_domain_list_spinlock);
	560	owner = find_device(dev);
	561	if (!owner) {
	562	spin_unlock(&dev_domain_list_spinlock);
563	return -ENODEV;
564	}
565	list_del(&owner->list);
566	spin_unlock(&dev_domain_list_spinlock);
567	kfree(owner);
568	return 0;
569	}
570	EXPORT_SYMBOL_GPL(xen_unregister_device_domain_owner);
7c1bfd68	571	#endif