. and also to find the domain owner based on the PCI device and
to unregister a domain owner of a PCI device.
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>
---
arch/x86/include/asm/xen/pci.h | 18 +++++++++
arch/x86/xen/pci.c | 81 ++++++++++++++++++++++++++++++++++++++++
2 files changed, 99 insertions(+), 0 deletions(-)
diff --git a/arch/x86/include/asm/xen/pci.h b/arch/x86/include/asm/xen/pci.h
index cb84abe..d335c90 100644
--- a/arch/x86/include/asm/xen/pci.h
+++ b/arch/x86/include/asm/xen/pci.h
@@ -7,6 +7,11 @@ int xen_create_msi_irq(struct pci_dev *dev,
struct msi_desc *msidesc,
int type);
int xen_destroy_irq(int irq);
+
+int xen_find_device_domain_owner(struct pci_dev *dev);
+int xen_register_device_domain_owner(struct pci_dev *dev, domid_t domain);
+int xen_unregister_device_domain_owner(struct pci_dev *dev);
+
#else
static inline int xen_register_gsi(u32 gsi, int triggering, int polarity)
{
@@ -23,6 +28,19 @@ static inline int xen_destroy_irq(int irq)
{
return -1;
}
+static inline int xen_find_device_domain_owner(struct pci_dev *dev)
+{
+ return -1;
+}
+static inline int xen_register_device_domain_owner(struct pci_dev *dev,
+ domid_t domain)
+{
+ return -1;
+}
+static inline int xen_unregister_device_domain_owner(struct pci_dev *dev)
+{
+ return -1;
+}
#endif
#if defined(CONFIG_PCI_MSI) && defined(CONFIG_XEN_DOM0_PCI)
diff --git a/arch/x86/xen/pci.c b/arch/x86/xen/pci.c
index 44d91ad..6948d20 100644
--- a/arch/x86/xen/pci.c
+++ b/arch/x86/xen/pci.c
@@ -2,6 +2,7 @@
#include <linux/acpi.h>
#include <linux/pci.h>
#include <linux/msi.h>
+#include <linux/slab.h>
#include <asm/mpspec.h>
#include <asm/io_apic.h>
@@ -109,3 +110,83 @@ error:
return ret;
}
#endif
+
+struct xen_device_domain_owner {
+ domid_t domain;
+ struct pci_dev *dev;
+ struct list_head list;
+};
+
+static DEFINE_SPINLOCK(dev_domain_list_spinlock);
+static struct list_head dev_domain_list = LIST_HEAD_INIT(dev_domain_list);
+
+static struct xen_device_domain_owner *find_device(struct pci_dev *dev)
+{
+ struct xen_device_domain_owner *owner;
+
+ list_for_each_entry(owner, &dev_domain_list, list) {
+ if (owner->dev == dev)
+ return owner;
+ }
+ return NULL;
+}
+
+int xen_find_device_domain_owner(struct pci_dev *dev)
+{
+ struct xen_device_domain_owner *owner;
+ unsigned long flags;
+ int domain = -ENODEV;
+
+ spin_lock_irqsave(&dev_domain_list_spinlock, flags);
+ owner = find_device(dev);
+ if (owner)
+ domain = owner->domain;
+ spin_unlock_irqrestore(&dev_domain_list_spinlock, flags);
+ return domain;
+}
+EXPORT_SYMBOL(xen_find_device_domain_owner);
+
+int xen_register_device_domain_owner(struct pci_dev *dev, domid_t domain)
+{
+ struct xen_device_domain_owner *owner;
+ unsigned long flags;
+ int rc = 0;
+
+ spin_lock_irqsave(&dev_domain_list_spinlock, flags);
+ if (find_device(dev)) {
+ rc = -EEXIST;
+ goto out;
+ }
+ owner = kzalloc(sizeof(struct xen_device_domain_owner), GFP_KERNEL);
+ if (!owner) {
+ rc = -ENOMEM;
+ goto out;
+ }
+ owner->domain = domain;
+ owner->dev = dev;
+ list_add_tail(&owner->list, &dev_domain_list);
+out:
+ spin_unlock_irqrestore(&dev_domain_list_spinlock, flags);
+ return rc;
+}
+EXPORT_SYMBOL(xen_register_device_domain_owner);
+
+int xen_unregister_device_domain_owner(struct pci_dev *dev)
+{
+ struct xen_device_domain_owner *owner;
+ unsigned long flags;
+ int rc = 0;
+
+ spin_lock_irqsave(&dev_domain_list_spinlock, flags);
+ owner = find_device(dev);
+ if (!owner) {
+ rc = -ENODEV;
+ goto out;
+ }
+ list_del(&owner->list);
+ kfree(owner);
+out:
+ spin_unlock_irqrestore(&dev_domain_list_spinlock, flags);
+ return rc;
+}
+EXPORT_SYMBOL(xen_unregister_device_domain_owner);
--
1.6.2.2
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