[PATCH RFC 06/11] powerpc/pci: Enable assigning bus numbers instead of reading them from DT

[Sergey Miroshnichenko]

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.miroshniche...@yadro.com>
---
 arch/powerpc/kernel/pci_dn.c                 | 5 +++++
 arch/powerpc/platforms/powernv/eeh-powernv.c | 3 ++-
 2 files changed, 7 insertions(+), 1 deletion(-)

diff --git a/arch/powerpc/kernel/pci_dn.c b/arch/powerpc/kernel/pci_dn.c
index ad0ecf48e943..b9b7518eb2b4 100644
--- a/arch/powerpc/kernel/pci_dn.c
+++ b/arch/powerpc/kernel/pci_dn.c
@@ -559,6 +559,11 @@ 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 6bc24a47e9ef..6c126aa2a6b7 100644
--- a/arch/powerpc/platforms/powernv/eeh-powernv.c
+++ b/arch/powerpc/platforms/powernv/eeh-powernv.c
@@ -42,7 +42,8 @@ void pnv_pcibios_bus_add_device(struct pci_dev *pdev)
 {
        struct pci_dn *pdn = pci_get_pdn(pdev);
 
-       if (eeh_has_flag(EEH_FORCE_DISABLED))
+       if (eeh_has_flag(EEH_FORCE_DISABLED) ||
+           !pci_has_flag(PCI_REASSIGN_ALL_BUS))
                return;
 
        dev_dbg(&pdev->dev, "EEH: Setting up device\n");
-- 
2.23.0