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ACPI/PCI: Pay attention to device-specific _PXM node values 

The ACPI specification allows you to provide _PXM entries for devices based
on their location on a particular bus.  Let us use that if it is provided
rather than just assuming it makes sense to put the device into the
proximity domain of the root.

An example DSDT entry that will supply this is:

  Device (PCI2)
  {
    Name (_HID, "PNP0A08") // PCI Express Root Bridge
    Name (_CID, "PNP0A03") // Compatible PCI Root Bridge
    Name(_SEG, 2) // Segment of this Root complex
    Name(_BBN, 0xF8) // Base Bus Number
    Name(_CCA, 1)
    Method (_PXM, 0, NotSerialized) {
      Return(0x00)
    }

    ...
    Device (BRI0) {
      Name (_HID, "19E51610")
      Name (_ADR, 0)
      Name (_BBN, 0xF9)
      Device (CAR0) {
        Name (_HID, "97109912")
        Name (_ADR, 0)
        Method (_PXM, 0, NotSerialized) {
          Return(0x02)
        }
      }
    }
  }

Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
This commit is contained in:
Jonathan Cameron 2018-09-12 16:21:40 +01:00 committed by Bjorn Helgaas
parent d193631bfb
commit bad7dcd94f
1 changed files with 5 additions and 0 deletions
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5
drivers/pci/pci-acpi.c
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@ -751,10 +751,15 @@ static void pci_acpi_setup(struct device *dev)
{
struct pci_dev *pci_dev = to_pci_dev(dev);
struct acpi_device *adev = ACPI_COMPANION(dev);
int node;
if (!adev)
return;
node = acpi_get_node(adev->handle);
if (node != NUMA_NO_NODE)
set_dev_node(dev, node);
pci_acpi_optimize_delay(pci_dev, adev->handle);
pci_acpi_add_pm_notifier(adev, pci_dev);