powerpc/pcidn: Make VF pci_dn management CONFIG_PCI_IOV specific

The powerpc PCI code requires that a pci_dn structure exists for all
devices in the system. This is fine for real devices since at boot a pci_dn
is created for each PCI device in the DT and it's fine for hotplugged devices
since the hotplug slot driver will manage the pci_dn's devices in hotplug
slots. For SR-IOV, we need the platform / pcibios to manage the pci_dn for
virtual functions since firmware is unaware of VFs, and they aren't
"hot plugged" in the traditional sense.

Management of the pci_dn is handled by the, poorly named, functions:
add_pci_dev_data() and remove_pci_dev_data(). The entire body of these
functions is #ifdef`ed around CONFIG_PCI_IOV and they cannot be used
in any other context, so make them only available when CONFIG_PCI_IOV
is selected, and rename them to reflect their actual usage rather than
having them masquerade as generic code.
Signed-off-by: Oliver O'Halloran <oohall@gmail.com>
Reviewed-by: Sam Bobroff <sbobroff@linux.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20190821062655.19735-2-oohall@gmail.com

arch/powerpc/include/asm/pci-bridge.h

@@ -223,12 +223,15 @@ struct pci_dn {
 extern struct pci_dn *pci_get_pdn_by_devfn(struct pci_bus *bus,
 					   int devfn);
 extern struct pci_dn *pci_get_pdn(struct pci_dev *pdev);
-extern struct pci_dn *add_dev_pci_data(struct pci_dev *pdev);
-extern void remove_dev_pci_data(struct pci_dev *pdev);
 extern struct pci_dn *pci_add_device_node_info(struct pci_controller *hose,
 					       struct device_node *dn);
 extern void pci_remove_device_node_info(struct device_node *dn);
 
+#ifdef CONFIG_PCI_IOV
+struct pci_dn *add_sriov_vf_pdns(struct pci_dev *pdev);
+void remove_sriov_vf_pdns(struct pci_dev *pdev);
+#endif
+
 static inline int pci_device_from_OF_node(struct device_node *np,
 					  u8 *bus, u8 *devfn)
 {

arch/powerpc/kernel/pci_dn.c

@@ -125,7 +125,7 @@ struct pci_dn *pci_get_pdn(struct pci_dev *pdev)
 }
 
 #ifdef CONFIG_PCI_IOV
-static struct pci_dn *add_one_dev_pci_data(struct pci_dn *parent,
+static struct pci_dn *add_one_sriov_vf_pdn(struct pci_dn *parent,
 					   int vf_index,
 					   int busno, int devfn)
 {
@@ -151,11 +151,9 @@ static struct pci_dn *add_one_dev_pci_data(struct pci_dn *parent,
 
 	return pdn;
 }
-#endif
 
-struct pci_dn *add_dev_pci_data(struct pci_dev *pdev)
+struct pci_dn *add_sriov_vf_pdns(struct pci_dev *pdev)
 {
-#ifdef CONFIG_PCI_IOV
 	struct pci_dn *parent, *pdn;
 	int i;
 
@@ -176,7 +174,7 @@ struct pci_dn *add_dev_pci_data(struct pci_dev *pdev)
 	for (i = 0; i < pci_sriov_get_totalvfs(pdev); i++) {
 		struct eeh_dev *edev __maybe_unused;
 
-		pdn = add_one_dev_pci_data(parent, i,
+		pdn = add_one_sriov_vf_pdn(parent, i,
 					   pci_iov_virtfn_bus(pdev, i),
 					   pci_iov_virtfn_devfn(pdev, i));
 		if (!pdn) {
@@ -192,14 +190,11 @@ struct pci_dn *add_dev_pci_data(struct pci_dev *pdev)
 		edev->physfn = pdev;
 #endif /* CONFIG_EEH */
 	}
-#endif /* CONFIG_PCI_IOV */
-
 	return pci_get_pdn(pdev);
 }
 
-void remove_dev_pci_data(struct pci_dev *pdev)
+void remove_sriov_vf_pdns(struct pci_dev *pdev)
 {
-#ifdef CONFIG_PCI_IOV
 	struct pci_dn *parent;
 	struct pci_dn *pdn, *tmp;
 	int i;
@@ -271,8 +266,8 @@ void remove_dev_pci_data(struct pci_dev *pdev)
 			kfree(pdn);
 		}
 	}
-#endif /* CONFIG_PCI_IOV */
 }
+#endif /* CONFIG_PCI_IOV */
 
 struct pci_dn *pci_add_device_node_info(struct pci_controller *hose,
 					struct device_node *dn)

arch/powerpc/platforms/powernv/pci-ioda.c

@@ -1747,14 +1747,14 @@ int pnv_pcibios_sriov_disable(struct pci_dev *pdev)
 	pnv_pci_sriov_disable(pdev);
 
 	/* Release PCI data */
-	remove_dev_pci_data(pdev);
+	remove_sriov_vf_pdns(pdev);
 	return 0;
 }
 
 int pnv_pcibios_sriov_enable(struct pci_dev *pdev, u16 num_vfs)
 {
 	/* Allocate PCI data */
-	add_dev_pci_data(pdev);
+	add_sriov_vf_pdns(pdev);
 
 	return pnv_pci_sriov_enable(pdev, num_vfs);
 }

arch/powerpc/platforms/pseries/pci.c

@@ -192,7 +192,7 @@ int pseries_pci_sriov_enable(struct pci_dev *pdev, u16 num_vfs)
 int pseries_pcibios_sriov_enable(struct pci_dev *pdev, u16 num_vfs)
 {
 	/* Allocate PCI data */
-	add_dev_pci_data(pdev);
+	add_sriov_vf_pdns(pdev);
 	return pseries_pci_sriov_enable(pdev, num_vfs);
 }
 
@@ -204,7 +204,7 @@ int pseries_pcibios_sriov_disable(struct pci_dev *pdev)
 	/* Releasing pe_num_map */
 	kfree(pdn->pe_num_map);
 	/* Release PCI data */
-	remove_dev_pci_data(pdev);
+	remove_sriov_vf_pdns(pdev);
 	pci_vf_drivers_autoprobe(pdev, true);
 	return 0;
 }