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[v9,09/26] PCI: Movable BARs: Make just a single attempt to assign bridge resources

Message ID 20201218174011.340514-10-s.miroshnichenko@yadro.com
State New
Headers show
Series PCI: Allow BAR movement during boot and hotplug | expand

Commit Message

Sergei Miroshnichenko Dec. 18, 2020, 5:39 p.m. UTC 
With enabled BAR movement, all BARs and bridge windows are released at the
beginning of a reassign procedure, not just part of them. In this case only
one pass is enough, no need for several traverses.

In case of failures the pci_reassign_root_bus_resources() disables BARs for
one of the hot-added devices and retries the single-step assignment.

Signed-off-by: Sergei Miroshnichenko <s.miroshnichenko@yadro.com>
---
 drivers/pci/setup-bus.c | 7 +++++++
 1 file changed, 7 insertions(+)
diff mbox series

Patch

diff --git a/drivers/pci/setup-bus.c b/drivers/pci/setup-bus.c
index a69415348684..640090046ffd 100644
--- a/drivers/pci/setup-bus.c
+++ b/drivers/pci/setup-bus.c
@@ -1826,6 +1826,13 @@  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)) {