[PATCH v6 5/5] powerpc/pci: Enable assigning bus numbers instead of reading them from DT

[Sergey Miroshnichenko <s.miroshnichenko@yadro.com>]

If the firmware indicates support of reassigning bus numbers via the PHB's
"ibm,supported-movable-bdfs" property in DT, PowerNV will not depend on PCI
topology info from DT anymore.

This makes possible to re-enumerate the fabric, assign the new bus numbers
and switch from the pnv_php module to the standard pciehp driver for PCI
hotplug functionality.

Signed-off-by: Sergey Miroshnichenko <s.miroshnichenko@yadro.com>
---
 arch/powerpc/kernel/pci_dn.c                 | 5 +++++
 arch/powerpc/platforms/powernv/eeh-powernv.c | 2 +-
 2 files changed, 6 insertions(+), 1 deletion(-)

diff --git a/arch/powerpc/kernel/pci_dn.c b/arch/powerpc/kernel/pci_dn.c
index 261d61460eac..90f8d46550df 100644
--- a/arch/powerpc/kernel/pci_dn.c
+++ b/arch/powerpc/kernel/pci_dn.c
@@ -542,6 +542,11 @@ void pci_devs_phb_init_dynamic(struct pci_controller *phb)
 		phb->pci_data = pdn;
 	}
 
+	if (of_get_property(dn, "ibm,supported-movable-bdfs", NULL)) {
+		pci_add_flags(PCI_REASSIGN_ALL_BUS);
+		return;
+	}
+
 	/* Update dn->phb ptrs for new phb and children devices */
 	pci_traverse_device_nodes(dn, add_pdn, phb);
 }
diff --git a/arch/powerpc/platforms/powernv/eeh-powernv.c b/arch/powerpc/platforms/powernv/eeh-powernv.c
index 620a986209f5..eb01f16c4e60 100644
--- a/arch/powerpc/platforms/powernv/eeh-powernv.c
+++ b/arch/powerpc/platforms/powernv/eeh-powernv.c
@@ -41,7 +41,7 @@ void pnv_pcibios_bus_add_device(struct pci_dev *pdev)
 {
 	struct pci_dn *pdn = pci_get_pdn(pdev);
 
-	if (!pdev->is_virtfn)
+	if (!pdev->is_virtfn && !pci_has_flag(PCI_REASSIGN_ALL_BUS))
 		return;
 
 	/*
-- 
2.21.0