2 * Xen PCI Frontend Stub - puts some "dummy" functions in to the Linux
3 * x86 PCI core to support the Xen PCI Frontend
5 * Author: Ryan Wilson <hap9@epoch.ncsc.mil>
7 #include <linux/module.h>
8 #include <linux/init.h>
10 #include <linux/acpi.h>
13 #include <asm/pci_x86.h>
15 #include <asm/xen/hypervisor.h>
17 #include <xen/events.h>
18 #include <asm/xen/pci.h>
20 #if defined(CONFIG_PCI_MSI)
21 #include <linux/msi.h>
23 struct xen_pci_frontend_ops *xen_pci_frontend;
24 EXPORT_SYMBOL_GPL(xen_pci_frontend);
27 * For MSI interrupts we have to use drivers/xen/event.s functions to
28 * allocate an irq_desc and setup the right */
31 static int xen_setup_msi_irqs(struct pci_dev *dev, int nvec, int type)
34 struct msi_desc *msidesc;
37 v = kzalloc(sizeof(int) * max(1, nvec), GFP_KERNEL);
41 if (!xen_initial_domain()) {
42 if (type == PCI_CAP_ID_MSIX)
43 ret = xen_pci_frontend_enable_msix(dev, &v, nvec);
45 ret = xen_pci_frontend_enable_msi(dev, &v);
50 list_for_each_entry(msidesc, &dev->msi_list, list) {
51 irq = xen_allocate_pirq(v[i], 0, /* not sharable */
52 (type == PCI_CAP_ID_MSIX) ?
53 "pcifront-msi-x" : "pcifront-msi");
57 ret = set_irq_msi(irq, msidesc);
66 unbind_from_irqhandler(irq, NULL);
69 dev_err(&dev->dev, "Xen PCI frontend has not registered" \
70 " MSI/MSI-X support!\n");
76 static void xen_teardown_msi_irqs(struct pci_dev *dev)
78 /* Only do this when were are in non-privileged mode.*/
79 if (!xen_initial_domain()) {
80 struct msi_desc *msidesc;
82 msidesc = list_entry(dev->msi_list.next, struct msi_desc, list);
83 if (msidesc->msi_attrib.is_msix)
84 xen_pci_frontend_disable_msix(dev);
86 xen_pci_frontend_disable_msi(dev);
91 static void xen_teardown_msi_irq(unsigned int irq)
97 static int xen_pcifront_enable_irq(struct pci_dev *dev)
102 dev_info(&dev->dev, "Xen PCI enabling IRQ: %d\n", dev->irq);
107 if (dev->irq < NR_IRQS_LEGACY)
110 rc = xen_allocate_pirq(dev->irq, share, "pcifront");
112 dev_warn(&dev->dev, "Xen PCI IRQ: %d, failed to register:%d\n",
119 int __init pci_xen_init(void)
121 if (!xen_pv_domain() || xen_initial_domain())
124 printk(KERN_INFO "PCI: setting up Xen PCI frontend stub\n");
126 pcibios_set_cache_line_size();
128 pcibios_enable_irq = xen_pcifront_enable_irq;
129 pcibios_disable_irq = NULL;
132 /* Keep ACPI out of the picture */
137 /* Stop isapnp from probing */
141 #ifdef CONFIG_PCI_MSI
142 x86_msi.setup_msi_irqs = xen_setup_msi_irqs;
143 x86_msi.teardown_msi_irq = xen_teardown_msi_irq;
144 x86_msi.teardown_msi_irqs = xen_teardown_msi_irqs;