[PATCH RFC v4 6/9] powerpc/pci/IOV: Add support for runtime enabling the VFs

[Sergey Miroshnichenko]

When called within pcibios_sriov_enable(), the pci_sriov_get_totalvfs(pdev)
returns zero, because the device is yet preparing to enable the VFs.

With this patch it becomes possible to enable VFs via sysfs "sriov_numvfs"
on PowerNV.

Signed-off-by: Sergey Miroshnichenko <s.miroshnichenko at yadro.com>
---
 arch/powerpc/include/asm/pci-bridge.h     |  2 +-
 arch/powerpc/kernel/pci_dn.c              | 27 ++++++++++++++---------
 arch/powerpc/platforms/powernv/pci-ioda.c |  2 +-
 arch/powerpc/platforms/pseries/pci.c      |  2 +-
 4 files changed, 20 insertions(+), 13 deletions(-)

diff --git a/arch/powerpc/include/asm/pci-bridge.h b/arch/powerpc/include/asm/pci-bridge.h
index aee4fcc24990..8a30c48caa3e 100644
--- a/arch/powerpc/include/asm/pci-bridge.h
+++ b/arch/powerpc/include/asm/pci-bridge.h
@@ -225,7 +225,7 @@ 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 struct pci_dn *add_dev_pci_data(struct pci_dev *pdev, int num_vfs);
 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);
diff --git a/arch/powerpc/kernel/pci_dn.c b/arch/powerpc/kernel/pci_dn.c
index ed1aab424e91..1b1a6198eb28 100644
--- a/arch/powerpc/kernel/pci_dn.c
+++ b/arch/powerpc/kernel/pci_dn.c
@@ -229,18 +229,19 @@ static struct pci_dn *create_pdn(struct pci_dev *pdev, struct pci_dn *parent)
 	return pdn;
 }
 
-struct pci_dn *add_dev_pci_data(struct pci_dev *pdev)
+struct pci_dn *add_dev_pci_data(struct pci_dev *pdev, int num_vfs)
 {
 #ifdef CONFIG_PCI_IOV
 	struct pci_dn *parent, *pdn;
 	int i;
 
+	pdn = pci_get_pdn(pdev);
+
 	/* Only support IOV for now */
 	if (!pdev->is_physfn)
-		return pci_get_pdn(pdev);
+		return pdn;
 
 	/* Check if VFs have been populated */
-	pdn = pci_get_pdn(pdev);
 	if (!pdn || (pdn->flags & PCI_DN_FLAG_IOV_VF))
 		return NULL;
 
@@ -249,28 +250,34 @@ struct pci_dn *add_dev_pci_data(struct pci_dev *pdev)
 	if (!parent)
 		return NULL;
 
-	for (i = 0; i < pci_sriov_get_totalvfs(pdev); i++) {
+	for (i = 0; i < num_vfs; i++) {
 		struct eeh_dev *edev __maybe_unused;
+		struct pci_dn *vpdn;
 
-		pdn = add_one_dev_pci_data(parent, i,
-					   pci_iov_virtfn_bus(pdev, i),
-					   pci_iov_virtfn_devfn(pdev, i));
-		if (!pdn) {
+		vpdn = add_one_dev_pci_data(parent, i,
+					    pci_iov_virtfn_bus(pdev, i),
+					    pci_iov_virtfn_devfn(pdev, i));
+		if (!vpdn) {
 			dev_warn(&pdev->dev, "%s: Cannot create firmware data for VF#%d\n",
 				 __func__, i);
 			return NULL;
 		}
 
+		vpdn->vendor_id = pdn->vendor_id;
+		vpdn->device_id = pdn->device_id;
+		vpdn->class_code = pdn->class_code;
+		vpdn->pci_ext_config_space = 0;
+
 #ifdef CONFIG_EEH
 		/* Create the EEH device for the VF */
-		edev = eeh_dev_init(pdn);
+		edev = eeh_dev_init(vpdn);
 		BUG_ON(!edev);
 		edev->physfn = pdev;
 #endif /* CONFIG_EEH */
 	}
 #endif /* CONFIG_PCI_IOV */
 
-	return pci_get_pdn(pdev);
+	return pdn;
 }
 
 void remove_dev_pci_data(struct pci_dev *pdev)
diff --git a/arch/powerpc/platforms/powernv/pci-ioda.c b/arch/powerpc/platforms/powernv/pci-ioda.c
index 0631e8196dad..371e60c824d7 100644
--- a/arch/powerpc/platforms/powernv/pci-ioda.c
+++ b/arch/powerpc/platforms/powernv/pci-ioda.c
@@ -1728,7 +1728,7 @@ int pnv_pcibios_sriov_disable(struct pci_dev *pdev)
 int pnv_pcibios_sriov_enable(struct pci_dev *pdev, u16 num_vfs)
 {
 	/* Allocate PCI data */
-	add_dev_pci_data(pdev);
+	add_dev_pci_data(pdev, num_vfs);
 
 	return pnv_pci_sriov_enable(pdev, num_vfs);
 }
diff --git a/arch/powerpc/platforms/pseries/pci.c b/arch/powerpc/platforms/pseries/pci.c
index 37a77e57893e..054e8bf5d5d3 100644
--- a/arch/powerpc/platforms/pseries/pci.c
+++ b/arch/powerpc/platforms/pseries/pci.c
@@ -205,7 +205,7 @@ 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_dev_pci_data(pdev, num_vfs);
 	return pseries_pci_sriov_enable(pdev, num_vfs);
 }
 
-- 
2.20.1