xen: add the Xen implementation of pci_child_added method

Add the Xen specific implementation of pci_child_added to the Xen PCI
bus. This is needed so FreeBSD can register the devices it finds with
the hypervisor.

Sponsored by: Citrix Systems R&D

x86/xen/xen_pci.c:
 - Add the Xen pci_child_added method.

1 files changed, 24 insertions, 0 deletions

diff --git a/sys/x86/xen/xen_pci.c b/sys/x86/xen/xen_pci.c
index 5a186c5..d4a427d 100644
--- a/sys/x86/xen/xen_pci.c
+++ b/sys/x86/xen/xen_pci.c
@@ -40,6 +40,7 @@ __FBSDID("$FreeBSD$");
 #include <dev/pci/pci_private.h>
 
 #include <xen/xen-os.h>
+#include <xen/hypervisor.h>
 
 #include "pcib_if.h"
 #include "pci_if.h"
@@ -49,6 +50,7 @@ static int xen_pci_probe(device_t dev);
 static void xen_pci_enable_msi_method(device_t dev, device_t child,
     uint64_t address, uint16_t data);
 static void xen_pci_disable_msi_method(device_t dev, device_t child);
+static void xen_pci_child_added_method(device_t dev, device_t child);
 
 static device_method_t xen_pci_methods[] = {
 	/* Device interface */
@@ -57,6 +59,7 @@ static device_method_t xen_pci_methods[] = {
 	/* PCI interface overwrites */
 	DEVMETHOD(pci_enable_msi,	xen_pci_enable_msi_method),
 	DEVMETHOD(pci_disable_msi,	xen_pci_disable_msi_method),
+	DEVMETHOD(pci_child_added,	xen_pci_child_added_method),
 
 	DEVMETHOD_END
 };
@@ -106,3 +109,24 @@ xen_pci_disable_msi_method(device_t dev, device_t child)
 	pci_write_config(child, msi->msi_location + PCIR_MSI_CTRL,
 	    msi->msi_ctrl, 2);
 }
+
+static void
+xen_pci_child_added_method(device_t dev, device_t child)
+{
+	struct pci_devinfo *dinfo;
+	struct physdev_pci_device_add add_pci;
+	int error;
+
+	dinfo = device_get_ivars(child);
+	KASSERT((dinfo != NULL),
+	    ("xen_pci_add_child_method called with NULL dinfo"));
+
+	bzero(&add_pci, sizeof(add_pci));
+	add_pci.seg = dinfo->cfg.domain;
+	add_pci.bus = dinfo->cfg.bus;
+	add_pci.devfn = (dinfo->cfg.slot << 3) | dinfo->cfg.func;
+	error = HYPERVISOR_physdev_op(PHYSDEVOP_pci_device_add, &add_pci);
+	if (error)
+		panic("unable to add device bus %u devfn %u error: %d\n",
+		    add_pci.bus, add_pci.devfn, error);
+}