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

/*
 * Xen PCI - handle PCI (INTx) and MSI infrastructure calls for PV, HVM and
 * initial domain support. We also handle the DSDT _PRT callbacks for GSI's
 * used in HVM and initial domain mode (PV does not parse ACPI, so it has no
 * concept of GSIs). Under PV we hook under the pnbbios API for IRQs and
 * 0xcf8 PCI configuration read/write.
 *
 *   Author: Ryan Wilson <hap9@epoch.ncsc.mil>
 *           Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
 *           Stefano Stabellini <stefano.stabellini@eu.citrix.com>
 */
#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>

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;
	}
	/* In PV DomU the Xen PCI backend puts the PIRQ in the interrupt line.*/
	pirq = gsi;

	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;
}

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

	irq = xen_irq_from_gsi(gsi);
	if (irq > 0)
		return irq;

	if (set_pirq)
		pirq = 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;
	}

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

	if (gsi_override >= 0)
		gsi = gsi_override;

	irq = xen_bind_pirq_gsi_to_irq(gsi, map_irq.pirq, shareable, name);
	if (irq < 0)
		goto out;

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

static int acpi_register_gsi_xen_hvm(struct device *dev, u32 gsi,
				     int trigger, int polarity)
{
	if (!xen_hvm_domain())
		return -1;

	return xen_register_pirq(gsi, -1 /* no GSI override */, trigger,
				 false /* no mapping of GSI to PIRQ */);
}

#ifdef CONFIG_XEN_DOM0
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, true);

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

	if (type == PCI_CAP_ID_MSI && nvec > 1)
		return 1;

	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],
					       (type == PCI_CAP_ID_MSIX) ?
					       "pcifront-msi-x" :
					       "pcifront-msi",
						DOMID_SELF);
		if (irq < 0) {
			ret = irq;
			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;
}

#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;

	if (type == PCI_CAP_ID_MSI && nvec > 1)
		return 1;

	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) {
				irq = -ENODEV;
				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,
					       (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 irq;
}

#ifdef CONFIG_XEN_DOM0
static bool __read_mostly pci_seg_supported = true;

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

	if (type == PCI_CAP_ID_MSI && nvec > 1)
		return 1;

	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_SEG;
		map_irq.index = -1;
		map_irq.pirq = -1;
		map_irq.bus = dev->bus->number |
			      (pci_domain_nr(dev->bus) << 16);
		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_TABLE_BIR);

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

		ret = -EINVAL;
		if (pci_seg_supported)
			ret = HYPERVISOR_physdev_op(PHYSDEVOP_map_pirq,
						    &map_irq);
		if (ret == -EINVAL && !pci_domain_nr(dev->bus)) {
			map_irq.type = MAP_PIRQ_TYPE_MSI;
			map_irq.index = -1;
			map_irq.pirq = -1;
			map_irq.bus = dev->bus->number;
			ret = HYPERVISOR_physdev_op(PHYSDEVOP_map_pirq,
						    &map_irq);
			if (ret != -EINVAL)
				pci_seg_supported = false;
		}
		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,
					       (type == PCI_CAP_ID_MSIX) ?
					       "msi-x" : "msi",
						domid);
		if (ret < 0)
			goto out;
	}
	ret = 0;
out:
	return ret;
}

static void xen_initdom_restore_msi_irqs(struct pci_dev *dev, int irq)
{
	int ret = 0;

	if (pci_seg_supported) {
		struct physdev_pci_device restore_ext;

		restore_ext.seg = pci_domain_nr(dev->bus);
		restore_ext.bus = dev->bus->number;
		restore_ext.devfn = dev->devfn;
		ret = HYPERVISOR_physdev_op(PHYSDEVOP_restore_msi_ext,
					&restore_ext);
		if (ret == -ENOSYS)
			pci_seg_supported = false;
		WARN(ret && ret != -ENOSYS, "restore_msi_ext -> %d\n", ret);
	}
	if (!pci_seg_supported) {
		struct physdev_restore_msi restore;

		restore.bus = dev->bus->number;
		restore.devfn = dev->devfn;
		ret = HYPERVISOR_physdev_op(PHYSDEVOP_restore_msi, &restore);
		WARN(ret && ret != -ENOSYS, "restore_msi -> %d\n", ret);
	}
}
#endif

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);
}

#endif

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_have_vector_callback || !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 __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).
	 */
	if (acpi_gsi_to_irq(gsi, &irq) == 0) {
		/* Use the provided value if it's valid. */
		if (irq >= 0)
			gsi_override = irq;
	}

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

	return;
}

int __init pci_xen_initial_domain(void)
{
	int irq;

#ifdef CONFIG_PCI_MSI
	x86_msi.setup_msi_irqs = xen_initdom_setup_msi_irqs;
	x86_msi.teardown_msi_irq = xen_teardown_msi_irq;
	x86_msi.restore_msi_irqs = xen_initdom_restore_msi_irqs;
#endif
	xen_setup_acpi_sci();
	__acpi_register_gsi = acpi_register_gsi_xen;
	/* 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,
			true /* Map GSI to PIRQ */);
	}
	if (0 == nr_ioapics) {
		for (irq = 0; irq < NR_IRQS_LEGACY; irq++)
			xen_bind_pirq_gsi_to_irq(irq, irq, 0, "xt-pic");
	}
	return 0;
}

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	1	/*
996c34ae KRW	2	* Xen PCI - handle PCI (INTx) and MSI infrastructure calls for PV, HVM and
	3	* initial domain support. We also handle the DSDT _PRT callbacks for GSI's
	4	* used in HVM and initial domain mode (PV does not parse ACPI, so it has no
	5	* concept of GSIs). Under PV we hook under the pnbbios API for IRQs and
	6	* 0xcf8 PCI configuration read/write.
b5401a96 AN	7	*
b5401a96 AN	8	* Author: Ryan Wilson <hap9@epoch.ncsc.mil>
996c34ae KRW	9	* Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
996c34ae KRW	10	* Stefano Stabellini <stefano.stabellini@eu.citrix.com>
b5401a96 AN	11	*/
	12	#include <linux/module.h>
	13	#include <linux/init.h>
	14	#include <linux/pci.h>
	15	#include <linux/acpi.h>
	16
	17	#include <linux/io.h>
0e058e52	18	#include <asm/io_apic.h>
b5401a96 AN	19	#include <asm/pci_x86.h>
	20
	21	#include <asm/xen/hypervisor.h>
	22
3942b740	23	#include <xen/features.h>
b5401a96 AN	24	#include <xen/events.h>
	25	#include <asm/xen/pci.h>
	26
fef6e262 KRW	27	static int xen_pcifront_enable_irq(struct pci_dev *dev)
	28	{
	29	int rc;
	30	int share = 1;
	31	int pirq;
	32	u8 gsi;
	33
	34	rc = pci_read_config_byte(dev, PCI_INTERRUPT_LINE, &gsi);
	35	if (rc < 0) {
	36	dev_warn(&dev->dev, "Xen PCI: failed to read interrupt line: %d\n",
	37	rc);
	38	return rc;
	39	}
78316ada KRW	40	/* In PV DomU the Xen PCI backend puts the PIRQ in the interrupt line.*/
78316ada KRW	41	pirq = gsi;
fef6e262 KRW	42
	43	if (gsi < NR_IRQS_LEGACY)
	44	share = 0;
	45
	46	rc = xen_bind_pirq_gsi_to_irq(gsi, pirq, share, "pcifront");
	47	if (rc < 0) {
	48	dev_warn(&dev->dev, "Xen PCI: failed to bind GSI%d (PIRQ%d) to IRQ: %d\n",
	49	gsi, pirq, rc);
	50	return rc;
	51	}
	52
	53	dev->irq = rc;
	54	dev_info(&dev->dev, "Xen PCI mapped GSI%d to IRQ%d\n", gsi, dev->irq);
	55	return 0;
	56	}
	57
42a1de56	58	#ifdef CONFIG_ACPI
ed89eb63	59	static int xen_register_pirq(u32 gsi, int gsi_override, int triggering,
78316ada	60	bool set_pirq)
42a1de56	61	{
ed89eb63	62	int rc, pirq = -1, irq = -1;
42a1de56 SS	63	struct physdev_map_pirq map_irq;
	64	int shareable = 0;
	65	char *name;
	66
68c2c39a SS	67	irq = xen_irq_from_gsi(gsi);
	68	if (irq > 0)
	69	return irq;
	70
78316ada KRW	71	if (set_pirq)
	72	pirq = gsi;
	73
fef6e262 KRW	74	map_irq.domid = DOMID_SELF;
	75	map_irq.type = MAP_PIRQ_TYPE_GSI;
	76	map_irq.index = gsi;
	77	map_irq.pirq = pirq;
	78
	79	rc = HYPERVISOR_physdev_op(PHYSDEVOP_map_pirq, &map_irq);
	80	if (rc) {
	81	printk(KERN_WARNING "xen map irq failed %d\n", rc);
	82	return -1;
	83	}
	84
30bd35ed KRW	85	if (triggering == ACPI_EDGE_SENSITIVE) {
	86	shareable = 0;
	87	name = "ioapic-edge";
	88	} else {
	89	shareable = 1;
	90	name = "ioapic-level";
	91	}
	92
	93	if (gsi_override >= 0)
	94	gsi = gsi_override;
	95
ed89eb63	96	irq = xen_bind_pirq_gsi_to_irq(gsi, map_irq.pirq, shareable, name);
30bd35ed KRW	97	if (irq < 0)
	98	goto out;
	99
ed89eb63	100	printk(KERN_DEBUG "xen: --> pirq=%d -> irq=%d (gsi=%d)\n", map_irq.pirq, irq, gsi);
fef6e262 KRW	101	out:
	102	return irq;
	103	}
	104
ed89eb63 KRW	105	static int acpi_register_gsi_xen_hvm(struct device *dev, u32 gsi,
	106	int trigger, int polarity)
	107	{
	108	if (!xen_hvm_domain())
	109	return -1;
	110
78316ada KRW	111	return xen_register_pirq(gsi, -1 /* no GSI override */, trigger,
78316ada KRW	112	false /* no mapping of GSI to PIRQ */);
ed89eb63 KRW	113	}
	114
	115	#ifdef CONFIG_XEN_DOM0
fef6e262 KRW	116	static int xen_register_gsi(u32 gsi, int gsi_override, int triggering, int polarity)
	117	{
	118	int rc, irq;
	119	struct physdev_setup_gsi setup_gsi;
	120
	121	if (!xen_pv_domain())
	122	return -1;
	123
	124	printk(KERN_DEBUG "xen: registering gsi %u triggering %d polarity %d\n",
	125	gsi, triggering, polarity);
	126
ed89eb63	127	irq = xen_register_pirq(gsi, gsi_override, triggering, true);
fef6e262 KRW	128
	129	setup_gsi.gsi = gsi;
	130	setup_gsi.triggering = (triggering == ACPI_EDGE_SENSITIVE ? 0 : 1);
	131	setup_gsi.polarity = (polarity == ACPI_ACTIVE_HIGH ? 0 : 1);
	132
	133	rc = HYPERVISOR_physdev_op(PHYSDEVOP_setup_gsi, &setup_gsi);
	134	if (rc == -EEXIST)
	135	printk(KERN_INFO "Already setup the GSI :%d\n", gsi);
	136	else if (rc) {
	137	printk(KERN_ERR "Failed to setup GSI :%d, err_code:%d\n",
	138	gsi, rc);
	139	}
	140
	141	return irq;
	142	}
	143
	144	static int acpi_register_gsi_xen(struct device *dev, u32 gsi,
	145	int trigger, int polarity)
	146	{
	147	return xen_register_gsi(gsi, -1 /* no GSI override */, trigger, polarity);
	148	}
	149	#endif
d92edd81	150	#endif
fef6e262	151
b5401a96 AN	152	#if defined(CONFIG_PCI_MSI)
b5401a96 AN	153	#include <linux/msi.h>
809f9267	154	#include <asm/msidef.h>
b5401a96 AN	155
	156	struct xen_pci_frontend_ops *xen_pci_frontend;
	157	EXPORT_SYMBOL_GPL(xen_pci_frontend);
	158
fef6e262 KRW	159	static int xen_setup_msi_irqs(struct pci_dev *dev, int nvec, int type)
	160	{
	161	int irq, ret, i;
	162	struct msi_desc *msidesc;
	163	int *v;
	164
884ac297 KRW	165	if (type == PCI_CAP_ID_MSI && nvec > 1)
	166	return 1;
	167
fef6e262 KRW	168	v = kzalloc(sizeof(int) * max(1, nvec), GFP_KERNEL);
	169	if (!v)
	170	return -ENOMEM;
	171
	172	if (type == PCI_CAP_ID_MSIX)
	173	ret = xen_pci_frontend_enable_msix(dev, v, nvec);
	174	else
	175	ret = xen_pci_frontend_enable_msi(dev, v);
	176	if (ret)
	177	goto error;
	178	i = 0;
	179	list_for_each_entry(msidesc, &dev->msi_list, list) {
dec02dea	180	irq = xen_bind_pirq_msi_to_irq(dev, msidesc, v[i],
fef6e262 KRW	181	(type == PCI_CAP_ID_MSIX) ?
	182	"pcifront-msi-x" :
	183	"pcifront-msi",
	184	DOMID_SELF);
e6599225 KRW	185	if (irq < 0) {
e6599225 KRW	186	ret = irq;
fef6e262	187	goto free;
e6599225	188	}
fef6e262 KRW	189	i++;
	190	}
	191	kfree(v);
	192	return 0;
	193
	194	error:
	195	dev_err(&dev->dev, "Xen PCI frontend has not registered MSI/MSI-X support!\n");
	196	free:
	197	kfree(v);
	198	return ret;
	199	}
	200
af42b8d1 SS	201	#define XEN_PIRQ_MSI_DATA (MSI_DATA_TRIGGER_EDGE \| \
	202	MSI_DATA_LEVEL_ASSERT \| (3 << 8) \| MSI_DATA_VECTOR(0))
	203
809f9267 SS	204	static void xen_msi_compose_msg(struct pci_dev *pdev, unsigned int pirq,
	205	struct msi_msg *msg)
	206	{
	207	/* We set vector == 0 to tell the hypervisor we don't care about it,
	208	* but we want a pirq setup instead.
	209	* We use the dest_id field to pass the pirq that we want. */
	210	msg->address_hi = MSI_ADDR_BASE_HI \| MSI_ADDR_EXT_DEST_ID(pirq);
	211	msg->address_lo =
	212	MSI_ADDR_BASE_LO \|
	213	MSI_ADDR_DEST_MODE_PHYSICAL \|
	214	MSI_ADDR_REDIRECTION_CPU \|
	215	MSI_ADDR_DEST_ID(pirq);
	216
af42b8d1	217	msg->data = XEN_PIRQ_MSI_DATA;
809f9267 SS	218	}
	219
	220	static int xen_hvm_setup_msi_irqs(struct pci_dev *dev, int nvec, int type)
	221	{
bf480d95	222	int irq, pirq;
809f9267 SS	223	struct msi_desc *msidesc;
	224	struct msi_msg msg;
	225
884ac297 KRW	226	if (type == PCI_CAP_ID_MSI && nvec > 1)
	227	return 1;
	228
809f9267	229	list_for_each_entry(msidesc, &dev->msi_list, list) {
af42b8d1 SS	230	__read_msi_msg(msidesc, &msg);
	231	pirq = MSI_ADDR_EXT_DEST_ID(msg.address_hi) \|
	232	((msg.address_lo >> MSI_ADDR_DEST_ID_SHIFT) & 0xff);
bf480d95 IC	233	if (msg.data != XEN_PIRQ_MSI_DATA \|\|
	234	xen_irq_from_pirq(pirq) < 0) {
	235	pirq = xen_allocate_pirq_msi(dev, msidesc);
e6599225 KRW	236	if (pirq < 0) {
e6599225 KRW	237	irq = -ENODEV;
af42b8d1	238	goto error;
e6599225	239	}
bf480d95 IC	240	xen_msi_compose_msg(dev, pirq, &msg);
	241	__write_msi_msg(msidesc, &msg);
	242	dev_dbg(&dev->dev, "xen: msi bound to pirq=%d\n", pirq);
	243	} else {
	244	dev_dbg(&dev->dev,
	245	"xen: msi already bound to pirq=%d\n", pirq);
af42b8d1	246	}
dec02dea	247	irq = xen_bind_pirq_msi_to_irq(dev, msidesc, pirq,
bf480d95	248	(type == PCI_CAP_ID_MSIX) ?
beafbdc1 KRW	249	"msi-x" : "msi",
beafbdc1 KRW	250	DOMID_SELF);
bf480d95	251	if (irq < 0)
809f9267	252	goto error;
bf480d95 IC	253	dev_dbg(&dev->dev,
bf480d95 IC	254	"xen: msi --> pirq=%d --> irq=%d\n", pirq, irq);
809f9267 SS	255	}
	256	return 0;
	257
809f9267	258	error:
bf480d95 IC	259	dev_err(&dev->dev,
bf480d95 IC	260	"Xen PCI frontend has not registered MSI/MSI-X support!\n");
e6599225	261	return irq;
809f9267 SS	262	}
809f9267 SS	263
260a7d4c	264	#ifdef CONFIG_XEN_DOM0
55e901fc JB	265	static bool __read_mostly pci_seg_supported = true;
55e901fc JB	266
f731e3ef QH	267	static int xen_initdom_setup_msi_irqs(struct pci_dev *dev, int nvec, int type)
f731e3ef QH	268	{
71eef7d1	269	int ret = 0;
f731e3ef QH	270	struct msi_desc *msidesc;
f731e3ef QH	271
884ac297 KRW	272	if (type == PCI_CAP_ID_MSI && nvec > 1)
	273	return 1;
	274
f731e3ef	275	list_for_each_entry(msidesc, &dev->msi_list, list) {
71eef7d1	276	struct physdev_map_pirq map_irq;
beafbdc1 KRW	277	domid_t domid;
	278
	279	domid = ret = xen_find_device_domain_owner(dev);
	280	/* N.B. Casting int's -ENODEV to uint16_t results in 0xFFED,
	281	* hence check ret value for < 0. */
	282	if (ret < 0)
	283	domid = DOMID_SELF;
71eef7d1 IC	284
71eef7d1 IC	285	memset(&map_irq, 0, sizeof(map_irq));
beafbdc1	286	map_irq.domid = domid;
55e901fc	287	map_irq.type = MAP_PIRQ_TYPE_MSI_SEG;
71eef7d1 IC	288	map_irq.index = -1;
71eef7d1 IC	289	map_irq.pirq = -1;
55e901fc JB	290	map_irq.bus = dev->bus->number \|
55e901fc JB	291	(pci_domain_nr(dev->bus) << 16);
71eef7d1 IC	292	map_irq.devfn = dev->devfn;
	293
	294	if (type == PCI_CAP_ID_MSIX) {
	295	int pos;
	296	u32 table_offset, bir;
	297
	298	pos = pci_find_capability(dev, PCI_CAP_ID_MSIX);
	299
	300	pci_read_config_dword(dev, pos + PCI_MSIX_TABLE,
	301	&table_offset);
4be6bfe2	302	bir = (u8)(table_offset & PCI_MSIX_TABLE_BIR);
71eef7d1 IC	303
	304	map_irq.table_base = pci_resource_start(dev, bir);
	305	map_irq.entry_nr = msidesc->msi_attrib.entry_nr;
	306	}
	307
55e901fc JB	308	ret = -EINVAL;
	309	if (pci_seg_supported)
	310	ret = HYPERVISOR_physdev_op(PHYSDEVOP_map_pirq,
	311	&map_irq);
	312	if (ret == -EINVAL && !pci_domain_nr(dev->bus)) {
	313	map_irq.type = MAP_PIRQ_TYPE_MSI;
	314	map_irq.index = -1;
	315	map_irq.pirq = -1;
	316	map_irq.bus = dev->bus->number;
	317	ret = HYPERVISOR_physdev_op(PHYSDEVOP_map_pirq,
	318	&map_irq);
	319	if (ret != -EINVAL)
	320	pci_seg_supported = false;
	321	}
71eef7d1	322	if (ret) {
beafbdc1 KRW	323	dev_warn(&dev->dev, "xen map irq failed %d for %d domain\n",
beafbdc1 KRW	324	ret, domid);
71eef7d1 IC	325	goto out;
	326	}
	327
	328	ret = xen_bind_pirq_msi_to_irq(dev, msidesc,
dec02dea	329	map_irq.pirq,
71eef7d1	330	(type == PCI_CAP_ID_MSIX) ?
beafbdc1 KRW	331	"msi-x" : "msi",
beafbdc1 KRW	332	domid);
71eef7d1 IC	333	if (ret < 0)
71eef7d1 IC	334	goto out;
f731e3ef	335	}
71eef7d1 IC	336	ret = 0;
	337	out:
	338	return ret;
f731e3ef	339	}
8605c684 TL	340
	341	static void xen_initdom_restore_msi_irqs(struct pci_dev *dev, int irq)
	342	{
	343	int ret = 0;
	344
	345	if (pci_seg_supported) {
	346	struct physdev_pci_device restore_ext;
	347
	348	restore_ext.seg = pci_domain_nr(dev->bus);
	349	restore_ext.bus = dev->bus->number;
	350	restore_ext.devfn = dev->devfn;
	351	ret = HYPERVISOR_physdev_op(PHYSDEVOP_restore_msi_ext,
	352	&restore_ext);
	353	if (ret == -ENOSYS)
	354	pci_seg_supported = false;
	355	WARN(ret && ret != -ENOSYS, "restore_msi_ext -> %d\n", ret);
	356	}
	357	if (!pci_seg_supported) {
	358	struct physdev_restore_msi restore;
	359
	360	restore.bus = dev->bus->number;
	361	restore.devfn = dev->devfn;
	362	ret = HYPERVISOR_physdev_op(PHYSDEVOP_restore_msi, &restore);
	363	WARN(ret && ret != -ENOSYS, "restore_msi -> %d\n", ret);
	364	}
	365	}
b5401a96 AN	366	#endif
b5401a96 AN	367
fef6e262	368	static void xen_teardown_msi_irqs(struct pci_dev *dev)
b5401a96	369	{
fef6e262	370	struct msi_desc *msidesc;
b5401a96	371
fef6e262 KRW	372	msidesc = list_entry(dev->msi_list.next, struct msi_desc, list);
	373	if (msidesc->msi_attrib.is_msix)
	374	xen_pci_frontend_disable_msix(dev);
	375	else
	376	xen_pci_frontend_disable_msi(dev);
b5401a96	377
fef6e262 KRW	378	/* Free the IRQ's and the msidesc using the generic code. */
	379	default_teardown_msi_irqs(dev);
	380	}
f4d0635b	381
fef6e262 KRW	382	static void xen_teardown_msi_irq(unsigned int irq)
	383	{
	384	xen_destroy_irq(irq);
	385	}
b5401a96	386
fef6e262	387	#endif
3f2a230c	388
b5401a96 AN	389	int __init pci_xen_init(void)
	390	{
	391	if (!xen_pv_domain() \|\| xen_initial_domain())
	392	return -ENODEV;
	393
	394	printk(KERN_INFO "PCI: setting up Xen PCI frontend stub\n");
	395
	396	pcibios_set_cache_line_size();
	397
	398	pcibios_enable_irq = xen_pcifront_enable_irq;
	399	pcibios_disable_irq = NULL;
	400
	401	#ifdef CONFIG_ACPI
	402	/* Keep ACPI out of the picture */
	403	acpi_noirq = 1;
	404	#endif
	405
b5401a96 AN	406	#ifdef CONFIG_PCI_MSI
	407	x86_msi.setup_msi_irqs = xen_setup_msi_irqs;
	408	x86_msi.teardown_msi_irq = xen_teardown_msi_irq;
	409	x86_msi.teardown_msi_irqs = xen_teardown_msi_irqs;
	410	#endif
	411	return 0;
	412	}
3942b740 SS	413
	414	int __init pci_xen_hvm_init(void)
	415	{
207d543f	416	if (!xen_have_vector_callback \|\| !xen_feature(XENFEAT_hvm_pirqs))
3942b740 SS	417	return 0;
	418
	419	#ifdef CONFIG_ACPI
	420	/*
	421	* We don't want to change the actual ACPI delivery model,
	422	* just how GSIs get registered.
	423	*/
	424	__acpi_register_gsi = acpi_register_gsi_xen_hvm;
	425	#endif
809f9267 SS	426
	427	#ifdef CONFIG_PCI_MSI
	428	x86_msi.setup_msi_irqs = xen_hvm_setup_msi_irqs;
	429	x86_msi.teardown_msi_irq = xen_teardown_msi_irq;
	430	#endif
3942b740 SS	431	return 0;
3942b740 SS	432	}
38aa66fc JF	433
38aa66fc JF	434	#ifdef CONFIG_XEN_DOM0
38aa66fc JF	435	static __init void xen_setup_acpi_sci(void)
	436	{
	437	int rc;
	438	int trigger, polarity;
	439	int gsi = acpi_sci_override_gsi;
ee339fe6 KRW	440	int irq = -1;
ee339fe6 KRW	441	int gsi_override = -1;
38aa66fc JF	442
	443	if (!gsi)
	444	return;
	445
	446	rc = acpi_get_override_irq(gsi, &trigger, &polarity);
	447	if (rc) {
	448	printk(KERN_WARNING "xen: acpi_get_override_irq failed for acpi"
	449	" sci, rc=%d\n", rc);
	450	return;
	451	}
	452	trigger = trigger ? ACPI_LEVEL_SENSITIVE : ACPI_EDGE_SENSITIVE;
	453	polarity = polarity ? ACPI_ACTIVE_LOW : ACPI_ACTIVE_HIGH;
996c34ae	454
38aa66fc JF	455	printk(KERN_INFO "xen: sci override: global_irq=%d trigger=%d "
	456	"polarity=%d\n", gsi, trigger, polarity);
	457
ee339fe6 KRW	458	/* Before we bind the GSI to a Linux IRQ, check whether
	459	* we need to override it with bus_irq (IRQ) value. Usually for
	460	* IRQs below IRQ_LEGACY_IRQ this holds IRQ == GSI, as so:
	461	* ACPI: INT_SRC_OVR (bus 0 bus_irq 9 global_irq 9 low level)
	462	* but there are oddballs where the IRQ != GSI:
	463	* ACPI: INT_SRC_OVR (bus 0 bus_irq 9 global_irq 20 low level)
	464	* which ends up being: gsi_to_irq[9] == 20
	465	* (which is what acpi_gsi_to_irq ends up calling when starting the
	466	* the ACPI interpreter and keels over since IRQ 9 has not been
	467	* setup as we had setup IRQ 20 for it).
	468	*/
ee339fe6	469	if (acpi_gsi_to_irq(gsi, &irq) == 0) {
97ffab1f KRW	470	/* Use the provided value if it's valid. */
97ffab1f KRW	471	if (irq >= 0)
ee339fe6 KRW	472	gsi_override = irq;
	473	}
	474
	475	gsi = xen_register_gsi(gsi, gsi_override, trigger, polarity);
38aa66fc JF	476	printk(KERN_INFO "xen: acpi sci %d\n", gsi);
	477
	478	return;
	479	}
a0ee0567 KRW	480
a0ee0567 KRW	481	int __init pci_xen_initial_domain(void)
38aa66fc	482	{
78316ada	483	int irq;
a0ee0567	484
f731e3ef QH	485	#ifdef CONFIG_PCI_MSI
	486	x86_msi.setup_msi_irqs = xen_initdom_setup_msi_irqs;
	487	x86_msi.teardown_msi_irq = xen_teardown_msi_irq;
8605c684	488	x86_msi.restore_msi_irqs = xen_initdom_restore_msi_irqs;
f731e3ef	489	#endif
38aa66fc JF	490	xen_setup_acpi_sci();
38aa66fc JF	491	__acpi_register_gsi = acpi_register_gsi_xen;
38aa66fc JF	492	/* Pre-allocate legacy irqs */
	493	for (irq = 0; irq < NR_IRQS_LEGACY; irq++) {
	494	int trigger, polarity;
	495
	496	if (acpi_get_override_irq(irq, &trigger, &polarity) == -1)
	497	continue;
	498
ee339fe6	499	xen_register_pirq(irq, -1 /* no GSI override */,
ed89eb63	500	trigger ? ACPI_LEVEL_SENSITIVE : ACPI_EDGE_SENSITIVE,
78316ada	501	true /* Map GSI to PIRQ */);
38aa66fc	502	}
9b6519db	503	if (0 == nr_ioapics) {
78316ada KRW	504	for (irq = 0; irq < NR_IRQS_LEGACY; irq++)
78316ada KRW	505	xen_bind_pirq_gsi_to_irq(irq, irq, 0, "xt-pic");
9b6519db	506	}
a0ee0567	507	return 0;
38aa66fc	508	}
c55fa78b KRW	509
	510	struct xen_device_domain_owner {
	511	domid_t domain;
	512	struct pci_dev *dev;
	513	struct list_head list;
	514	};
	515
	516	static DEFINE_SPINLOCK(dev_domain_list_spinlock);
	517	static struct list_head dev_domain_list = LIST_HEAD_INIT(dev_domain_list);
	518
	519	static struct xen_device_domain_owner find_device(struct pci_dev dev)
	520	{
	521	struct xen_device_domain_owner *owner;
	522
	523	list_for_each_entry(owner, &dev_domain_list, list) {
	524	if (owner->dev == dev)
	525	return owner;
	526	}
	527	return NULL;
	528	}
	529
	530	int xen_find_device_domain_owner(struct pci_dev *dev)
	531	{
	532	struct xen_device_domain_owner *owner;
	533	int domain = -ENODEV;
	534
	535	spin_lock(&dev_domain_list_spinlock);
	536	owner = find_device(dev);
	537	if (owner)
	538	domain = owner->domain;
	539	spin_unlock(&dev_domain_list_spinlock);
	540	return domain;
	541	}
	542	EXPORT_SYMBOL_GPL(xen_find_device_domain_owner);
	543
	544	int xen_register_device_domain_owner(struct pci_dev *dev, uint16_t domain)
	545	{
	546	struct xen_device_domain_owner *owner;
	547
	548	owner = kzalloc(sizeof(struct xen_device_domain_owner), GFP_KERNEL);
	549	if (!owner)
	550	return -ENODEV;
	551
	552	spin_lock(&dev_domain_list_spinlock);
	553	if (find_device(dev)) {
	554	spin_unlock(&dev_domain_list_spinlock);
	555	kfree(owner);
	556	return -EEXIST;
	557	}
	558	owner->domain = domain;
	559	owner->dev = dev;
	560	list_add_tail(&owner->list, &dev_domain_list);
	561	spin_unlock(&dev_domain_list_spinlock);
	562	return 0;
	563	}
	564	EXPORT_SYMBOL_GPL(xen_register_device_domain_owner);
	565
	566	int xen_unregister_device_domain_owner(struct pci_dev *dev)
	567	{
	568	struct xen_device_domain_owner *owner;
	569
	570	spin_lock(&dev_domain_list_spinlock);
	571	owner = find_device(dev);
	572	if (!owner) {
573	spin_unlock(&dev_domain_list_spinlock);
574	return -ENODEV;
575	}
576	list_del(&owner->list);
577	spin_unlock(&dev_domain_list_spinlock);
578	kfree(owner);
579	return 0;
580	}
581	EXPORT_SYMBOL_GPL(xen_unregister_device_domain_owner);
7c1bfd68	582	#endif