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PCI: Warn if no host bridge NUMA node info

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In pci_call_probe(), we try to run driver probe functions on the node where
the device is attached.  If we don't know which node the device is attached
to, the driver will likely run on the wrong node.  This will still work,
but performance will not be as good as it could be.

On NUMA systems, warn if we don't know which node a PCI host bridge is
attached to.  This is likely an indication that ACPI didn't supply a _PXM
method or the DT didn't supply a "numa-node-id" property.

[bhelgaas: commit log, check bus node]
Link: https://lore.kernel.org/r/1571467543-26125-1-git-send-email-linyunsheng@huawei.com
Signed-off-by: Yunsheng Lin <linyunsheng@huawei.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
This commit is contained in:
Yunsheng Lin 2019-10-19 14:45:43 +08:00 • committed by Bjorn Helgaas
parent 54ecb8f702
commit ad5086108b
1 changed files with 3 additions and 0 deletions
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3
drivers/pci/probe.c
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@ -897,6 +897,9 @@ static int pci_register_host_bridge(struct pci_host_bridge *bridge)
else
pr_info("PCI host bridge to bus %s\n", name);
if (nr_node_ids > 1 && pcibus_to_node(bus) == NUMA_NO_NODE)
dev_warn(&bus->dev, "Unknown NUMA node; performance will be reduced\n");
/* Add initial resources to the bus */
resource_list_for_each_entry_safe(window, n, &resources) {
list_move_tail(&window->node, &bridge->windows);