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authorJan Beulich <JBeulich@suse.com>2011-09-22 09:17:57 +0100
committerKonrad Rzeszutek Wilk <konrad.wilk@oracle.com>2011-09-22 16:23:46 -0400
commit55e901fc1f03dd8437f877813c68b6014cdbeefd (patch)
tree0f3d81f7bb534a89fcc59e3109246ca5cd75935b /arch/x86/pci
parent6810df88dcfc22de267caf23eb072ffb97b3c411 (diff)
downloadlinux-55e901fc1f03dd8437f877813c68b6014cdbeefd.tar.bz2
xen/pci: support multi-segment systems
Now that the hypercall interface changes are in -unstable, make the kernel side code not ignore the segment (aka domain) number anymore (which results in pretty odd behavior on such systems). Rather, if only the old interfaces are available, don't call them for devices on non-zero segments at all. Signed-off-by: Jan Beulich <jbeulich@suse.com> [v1: Edited git description] Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Diffstat (limited to 'arch/x86/pci')
-rw-r--r--arch/x86/pci/xen.c22
1 files changed, 19 insertions, 3 deletions
diff --git a/arch/x86/pci/xen.c b/arch/x86/pci/xen.c
index f567965c0620..265fa8814ccd 100644
--- a/arch/x86/pci/xen.c
+++ b/arch/x86/pci/xen.c
@@ -185,6 +185,8 @@ static void xen_teardown_msi_irq(unsigned int 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;
@@ -202,10 +204,11 @@ static int xen_initdom_setup_msi_irqs(struct pci_dev *dev, int nvec, int type)
memset(&map_irq, 0, sizeof(map_irq));
map_irq.domid = domid;
- map_irq.type = MAP_PIRQ_TYPE_MSI;
+ map_irq.type = MAP_PIRQ_TYPE_MSI_SEG;
map_irq.index = -1;
map_irq.pirq = -1;
- map_irq.bus = dev->bus->number;
+ map_irq.bus = dev->bus->number |
+ (pci_domain_nr(dev->bus) << 16);
map_irq.devfn = dev->devfn;
if (type == PCI_CAP_ID_MSIX) {
@@ -222,7 +225,20 @@ static int xen_initdom_setup_msi_irqs(struct pci_dev *dev, int nvec, int type)
map_irq.entry_nr = msidesc->msi_attrib.entry_nr;
}
- ret = HYPERVISOR_physdev_op(PHYSDEVOP_map_pirq, &map_irq);
+ 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);