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[v8,09/24] PCI: hotplug: Try to reassign movable BARs only once

Message ID 20200427182358.2067702-10-s.miroshnichenko@yadro.com
State New, archived
Delegated to: Bjorn Helgaas
Headers show
Series PCI: Allow BAR movement during boot and hotplug | expand

Commit Message

Sergei Miroshnichenko April 27, 2020, 6:23 p.m. UTC
With enabled BAR movement, BARs and bridge windows can only be assigned to
their direct parents, so there can be only one variant of resource tree,
thus every retry within the pci_assign_unassigned_root_bus_resources() will
result in the same tree, and it is enough to try just once.

In case of failures the pci_reassign_root_bus_resources() disables BARs for
one of the hot-added devices and tries the assignment again.

Signed-off-by: Sergei Miroshnichenko <s.miroshnichenko@yadro.com>
 drivers/pci/setup-bus.c | 7 +++++++
 1 file changed, 7 insertions(+)
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diff --git a/drivers/pci/setup-bus.c b/drivers/pci/setup-bus.c
index d265db4c746d..92517275fc06 100644
--- a/drivers/pci/setup-bus.c
+++ b/drivers/pci/setup-bus.c
@@ -1816,6 +1816,13 @@  void pci_assign_unassigned_root_bus_resources(struct pci_bus *bus)
 	int pci_try_num = 1;
 	enum enable_type enable_local;
+	if (pci_can_move_bars) {
+		__pci_bus_size_bridges(bus, NULL);
+		__pci_bus_assign_resources(bus, NULL, NULL);
+		goto dump;
+	}
 	/* Don't realloc if asked to do so */
 	enable_local = pci_realloc_detect(bus, pci_realloc_enable);
 	if (pci_realloc_enabled(enable_local)) {