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[v7,22/26] PCI: pciehp: Trigger a domain rescan on hp events when enabled movable BARs

Message ID 20200129152937.311162-23-s.miroshnichenko@yadro.com
State New
Headers show
Series PCI: Allow BAR movement during boot and hotplug | expand

Commit Message

Sergei Miroshnichenko Jan. 29, 2020, 3:29 p.m. UTC
With movable BARs, adding a hotplugged device is not local to its bridge
anymore, but it affects the whole RC: BARs, bridge windows and bus numbers
can be substantially rearranged. So instead of trying to fit the new
devices into preallocated reserved gaps, initiate a full domain rescan.

The pci_rescan_bus() covers all the operations of the replaced functions:
 - assigning new bus numbers, as the pci_hp_add_bridge() does it;
 - allocating BARs (pci_assign_unassigned_bridge_resources());
 - cofiguring MPS settings (pcie_bus_configure_settings());
 - binding devices to their drivers (pci_bus_add_devices()).

CC: Lukas Wunner <lukas@wunner.de>
Signed-off-by: Sergei Miroshnichenko <s.miroshnichenko@yadro.com>
 drivers/pci/hotplug/pciehp_pci.c | 5 +++++
 1 file changed, 5 insertions(+)
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diff --git a/drivers/pci/hotplug/pciehp_pci.c b/drivers/pci/hotplug/pciehp_pci.c
index d17f3bf36f70..6d4c1ef38210 100644
--- a/drivers/pci/hotplug/pciehp_pci.c
+++ b/drivers/pci/hotplug/pciehp_pci.c
@@ -58,6 +58,11 @@  int pciehp_configure_device(struct controller *ctrl)
 		goto out;
+	if (pci_can_move_bars) {
+		pci_rescan_bus(parent);
+		goto out;
+	}
 	for_each_pci_bridge(dev, parent)