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arm64: PCI: Allow resource reallocation if necessary

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Call pci_assign_unassigned_root_bus_resources() instead of the simpler:

  pci_bus_size_bridges(bus);
  pci_bus_assign_resources(bus);

pci_assign_unassigned_root_bus_resources() calls:

  __pci_bus_size_bridges(bus, add_list);
  __pci_bus_assign_resources(bus, add_list, &fail_head);

so this should be equivalent as long as we're able to assign everything.
If we were unable to assign something, previously we did nothing and left
it unassigned, but after this patch, we will attempt to do some
reallocation.

Once we start honoring FW resource allocations, this will bring up the
"reallocation" feature which can help making room for SR-IOV when
necessary.

Link: https://lore.kernel.org/r/20190615002359.29577-1-benh@kernel.crashing.org
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
[bhelgaas: commit log]
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Acked-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
This commit is contained in:
Benjamin Herrenschmidt 2019-06-15 10:23:56 +10:00 committed by Bjorn Helgaas
parent 7ac0d094fb
commit 3e8ba96866
1 changed files with 1 additions and 2 deletions
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3
arch/arm64/kernel/pci.c
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@ -193,8 +193,7 @@ struct pci_bus *pci_acpi_scan_root(struct acpi_pci_root *root)
if (!bus)
return NULL;
pci_bus_size_bridges(bus);
pci_bus_assign_resources(bus);
pci_assign_unassigned_root_bus_resources(bus);
list_for_each_entry(child, &bus->children, node)
pcie_bus_configure_settings(child);