--- /dev/null
+/*
+ * 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);
+
+#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) {
+ xen_allocate_pirq_msi((type == PCI_CAP_ID_MSIX) ?
+ "msi-x" : "msi", &irq, &pirq, XEN_ALLOC_IRQ);
+ 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;
+ }
+ xen_allocate_pirq_msi((type == PCI_CAP_ID_MSIX) ?
+ "msi-x" : "msi", &irq, &pirq, (XEN_ALLOC_IRQ | XEN_ALLOC_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
projects / mv-sheeva.git / blobdiff