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Diffstat (limited to 'arch/x86/pci/xen.c')
-rw-r--r--arch/x86/pci/xen.c35
1 files changed, 25 insertions, 10 deletions
diff --git a/arch/x86/pci/xen.c b/arch/x86/pci/xen.c
index 117f5b8daf75..25cd4a07d09f 100644
--- a/arch/x86/pci/xen.c
+++ b/arch/x86/pci/xen.c
@@ -70,6 +70,9 @@ static int acpi_register_gsi_xen_hvm(struct device *dev, u32 gsi,
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)
{
@@ -83,12 +86,7 @@ static void xen_msi_compose_msg(struct pci_dev *pdev, unsigned int pirq,
MSI_ADDR_REDIRECTION_CPU |
MSI_ADDR_DEST_ID(pirq);
- msg->data =
- MSI_DATA_TRIGGER_EDGE |
- MSI_DATA_LEVEL_ASSERT |
- /* delivery mode reserved */
- (3 << 8) |
- MSI_DATA_VECTOR(0);
+ msg->data = XEN_PIRQ_MSI_DATA;
}
static int xen_hvm_setup_msi_irqs(struct pci_dev *dev, int nvec, int type)
@@ -98,8 +96,23 @@ static int xen_hvm_setup_msi_irqs(struct pci_dev *dev, int nvec, int type)
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);
+ "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);
@@ -147,8 +160,10 @@ static int xen_setup_msi_irqs(struct pci_dev *dev, int nvec, int type)
irq = xen_allocate_pirq(v[i], 0, /* not sharable */
(type == PCI_CAP_ID_MSIX) ?
"pcifront-msi-x" : "pcifront-msi");
- if (irq < 0)
- return -1;
+ if (irq < 0) {
+ ret = -1;
+ goto free;
+ }
ret = set_irq_msi(irq, msidesc);
if (ret)
@@ -164,7 +179,7 @@ error:
if (ret == -ENODEV)
dev_err(&dev->dev, "Xen PCI frontend has not registered" \
" MSI/MSI-X support!\n");
-
+free:
kfree(v);
return ret;
}