Merge tag 'stable/for-linus-3.4-tag' of git://git.kernel.org/pub/scm/linux/kernel...

[firefly-linux-kernel-4.4.55.git] / arch / x86 / pci / xen.c

diff --git a/arch/x86/pci/xen.c b/arch/x86/pci/xen.c
index d99346ea8fdb4317b74fded709c6bd971b3a066c..7415aa927913eee72a424377636c02cf0f46c518 100644 (file)
--- a/arch/x86/pci/xen.c
+++ b/arch/x86/pci/xen.c
@@ -324,6 +324,32 @@ static int xen_initdom_setup_msi_irqs(struct pci_dev *dev, int nvec, int type)
 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)
@@ -446,6 +472,7 @@ 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;
+       x86_msi.restore_msi_irqs = xen_initdom_restore_msi_irqs;
 #endif
        xen_setup_acpi_sci();
        __acpi_register_gsi = acpi_register_gsi_xen;