xen/pciback: Have 'passthrough' option instead of XEN_PCIDEV_BACKEND_PASS and XEN_PCIDEV_BACKEND_VPCI

.. compile options. This way the user can decide during runtime whether they
want the default 'vpci' (virtual pci passthrough) or where the PCI devices
are passed in without any BDF renumbering. The option 'passthrough' allows
the user to toggle the it from 0 (vpci) to 1 (passthrough).

Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>

1 files changed, 28 insertions, 15 deletions

diff --git a/drivers/xen/xen-pciback/passthrough.c b/drivers/xen/xen-pciback/passthrough.c
index b451cb8dd2ff..1d32a9a42c01 100644
--- a/drivers/xen/xen-pciback/passthrough.c
+++ b/drivers/xen/xen-pciback/passthrough.c
@@ -16,9 +16,10 @@ struct passthrough_dev_data {
 	spinlock_t lock;
 };
 
-struct pci_dev *xen_pcibk_get_pci_dev(struct xen_pcibk_device *pdev,
-				      unsigned int domain, unsigned int bus,
-				      unsigned int devfn)
+static struct pci_dev *__xen_pcibk_get_pci_dev(struct xen_pcibk_device *pdev,
+					       unsigned int domain,
+					       unsigned int bus,
+					       unsigned int devfn)
 {
 	struct passthrough_dev_data *dev_data = pdev->pci_dev_data;
 	struct pci_dev_entry *dev_entry;
@@ -41,8 +42,9 @@ struct pci_dev *xen_pcibk_get_pci_dev(struct xen_pcibk_device *pdev,
 	return dev;
 }
 
-int xen_pcibk_add_pci_dev(struct xen_pcibk_device *pdev, struct pci_dev *dev,
-			  int devid, publish_pci_dev_cb publish_cb)
+static int __xen_pcibk_add_pci_dev(struct xen_pcibk_device *pdev,
+				   struct pci_dev *dev,
+				   int devid, publish_pci_dev_cb publish_cb)
 {
 	struct passthrough_dev_data *dev_data = pdev->pci_dev_data;
 	struct pci_dev_entry *dev_entry;
@@ -68,8 +70,8 @@ int xen_pcibk_add_pci_dev(struct xen_pcibk_device *pdev, struct pci_dev *dev,
 	return err;
 }
 
-void xen_pcibk_release_pci_dev(struct xen_pcibk_device *pdev,
-			       struct pci_dev *dev)
+static void __xen_pcibk_release_pci_dev(struct xen_pcibk_device *pdev,
+					struct pci_dev *dev)
 {
 	struct passthrough_dev_data *dev_data = pdev->pci_dev_data;
 	struct pci_dev_entry *dev_entry, *t;
@@ -92,7 +94,7 @@ void xen_pcibk_release_pci_dev(struct xen_pcibk_device *pdev,
 		pcistub_put_pci_dev(found_dev);
 }
 
-int xen_pcibk_init_devices(struct xen_pcibk_device *pdev)
+static int __xen_pcibk_init_devices(struct xen_pcibk_device *pdev)
 {
 	struct passthrough_dev_data *dev_data;
 
@@ -109,8 +111,8 @@ int xen_pcibk_init_devices(struct xen_pcibk_device *pdev)
 	return 0;
 }
 
-int xen_pcibk_publish_pci_roots(struct xen_pcibk_device *pdev,
-				publish_pci_root_cb publish_root_cb)
+static int __xen_pcibk_publish_pci_roots(struct xen_pcibk_device *pdev,
+					 publish_pci_root_cb publish_root_cb)
 {
 	int err = 0;
 	struct passthrough_dev_data *dev_data = pdev->pci_dev_data;
@@ -154,7 +156,7 @@ int xen_pcibk_publish_pci_roots(struct xen_pcibk_device *pdev,
 	return err;
 }
 
-void xen_pcibk_release_devices(struct xen_pcibk_device *pdev)
+static void __xen_pcibk_release_devices(struct xen_pcibk_device *pdev)
 {
 	struct passthrough_dev_data *dev_data = pdev->pci_dev_data;
 	struct pci_dev_entry *dev_entry, *t;
@@ -169,13 +171,24 @@ void xen_pcibk_release_devices(struct xen_pcibk_device *pdev)
 	pdev->pci_dev_data = NULL;
 }
 
-int xen_pcibk_get_pcifront_dev(struct pci_dev *pcidev,
-			       struct xen_pcibk_device *pdev,
-			       unsigned int *domain, unsigned int *bus,
-			       unsigned int *devfn)
+static int __xen_pcibk_get_pcifront_dev(struct pci_dev *pcidev,
+					struct xen_pcibk_device *pdev,
+					unsigned int *domain, unsigned int *bus,
+					unsigned int *devfn)
 {
 	*domain = pci_domain_nr(pcidev->bus);
 	*bus = pcidev->bus->number;
 	*devfn = pcidev->devfn;
 	return 1;
 }
+
+struct xen_pcibk_backend xen_pcibk_passthrough_backend = {
+	.name           = "passthrough",
+	.init           = __xen_pcibk_init_devices,
+	.free		= __xen_pcibk_release_devices,
+	.find           = __xen_pcibk_get_pcifront_dev,
+	.publish        = __xen_pcibk_publish_pci_roots,
+	.release        = __xen_pcibk_release_pci_dev,
+	.add            = __xen_pcibk_add_pci_dev,
+	.get            = __xen_pcibk_get_pci_dev,
+};