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authorQing He <qing.he@intel.com>2010-10-11 15:30:09 +0100
committerStefano Stabellini <stefano.stabellini@eu.citrix.com>2010-10-22 21:25:44 +0100
commitf731e3ef02b4744f4d7ca2f63539b900e47db31f (patch)
tree865ef6f817c372b99f0b36dc6f2638df087d51e7 /arch/x86/pci
parent38aa66fcb79e0a46c24bba96b6f2b851a6ec2037 (diff)
downloadop-kernel-dev-f731e3ef02b4744f4d7ca2f63539b900e47db31f.zip
op-kernel-dev-f731e3ef02b4744f4d7ca2f63539b900e47db31f.tar.gz
xen: remap MSIs into pirqs when running as initial domain
Implement xen_create_msi_irq to create an msi and remap it as pirq. Use xen_create_msi_irq to implement an initial domain specific version of setup_msi_irqs. Signed-off-by: Qing He <qing.he@intel.com> Signed-off-by: Yunhong Jiang <yunhong.jiang@intel.com> Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com> Signed-off-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com> Reviewed-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Diffstat (limited to 'arch/x86/pci')
-rw-r--r--arch/x86/pci/xen.c55
1 files changed, 37 insertions, 18 deletions
diff --git a/arch/x86/pci/xen.c b/arch/x86/pci/xen.c
index dd0b5fd..b3f4b30 100644
--- a/arch/x86/pci/xen.c
+++ b/arch/x86/pci/xen.c
@@ -135,14 +135,12 @@ static int xen_setup_msi_irqs(struct pci_dev *dev, int nvec, int type)
if (!v)
return -ENOMEM;
- if (!xen_initial_domain()) {
- 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;
- }
+ 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 */
@@ -172,23 +170,40 @@ error:
static void xen_teardown_msi_irqs(struct pci_dev *dev)
{
- /* Only do this when were are in non-privileged mode.*/
- if (!xen_initial_domain()) {
- 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);
- }
+ 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)
@@ -362,6 +377,10 @@ static int acpi_register_gsi_xen(struct device *dev, u32 gsi,
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;
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