PCI: Move domain assignment from arm64 to generic code

The current logic in arm64 pci_bus_assign_domain_nr() is flawed in that
depending on the host controller configuration for a platform and the
initialization sequence, core code may end up allocating PCI domain numbers
from both DT and the generic domain counter, which would result in PCI
domain allocation aliases/errors.

Fix the logic behind the PCI domain number assignment and move the
resulting code to the PCI core so the same domain allocation logic is used
on all platforms that select CONFIG_PCI_DOMAINS_GENERIC.

[bhelgaas: tidy changelog]
Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Acked-by: Liviu Dudau <Liviu.Dudau@arm.com>
Acked-by: Arnd Bergmann <arnd@arndb.de>
CC: Rob Herring <robh+dt@kernel.org>
CC: Catalin Marinas <catalin.marinas@arm.com>

1 files changed, 0 insertions, 22 deletions

diff --git a/arch/arm64/kernel/pci.c b/arch/arm64/kernel/pci.c
index ce5836c14ec1..6f93c24ca801 100644
--- a/arch/arm64/kernel/pci.c
+++ b/arch/arm64/kernel/pci.c
@@ -46,25 +46,3 @@ int pcibios_add_device(struct pci_dev *dev)
 
 	return 0;
 }
-
-
-#ifdef CONFIG_PCI_DOMAINS_GENERIC
-static bool dt_domain_found = false;
-
-void pci_bus_assign_domain_nr(struct pci_bus *bus, struct device *parent)
-{
-	int domain = of_get_pci_domain_nr(parent->of_node);
-
-	if (domain >= 0) {
-		dt_domain_found = true;
-	} else if (dt_domain_found == true) {
-		dev_err(parent, "Node %s is missing \"linux,pci-domain\" property in DT\n",
-			parent->of_node->full_name);
-		return;
-	} else {
-		domain = pci_get_new_domain_nr();
-	}
-
-	bus->domain_nr = domain;
-}
-#endif