https://bugzilla.kernel.org/show_bug.cgi?id=72051
Bug ID: 72051
Summary: Failed to correctly detect device numa_node
information on AMD systems
Product: ACPI
Version: 2.5
Kernel Version: 3.14-rc4
Hardware: x86-64
OS: Linux
Tree: Mainline
Status: NEW
Severity: normal
Priority: P1
Component: Other
Assignee: [email protected]
Reporter: [email protected]
Regression: No
This bug affects AMD family 12h and newer.
The device numa_node information in the sysfs for each PCI device (e.g.
/devices/pci0000:50/0000:50:00.2/numa_node) is showing value -1.
In file arch/x86/pci/acpi.c, in function pci_acpi_scan_root(), it is
queries the node information as following:
#ifdef CONFIG_ACPI_NUMA
pxm = acpi_get_pxm(device->handle);
if (pxm >= 0)
node = pxm_to_node(pxm);
if (node != -1)
set_mp_bus_to_node(busnum, node);
else
#endif
node = get_mp_bus_to_node(busnum);
In this case, I see that the acpi_get_pxm() returns -1. Therefore, it
falls back to using the node information in mp_bus_to_node[]. For AMD systems,
the arch/x86/pci/amd_bus.c only probe the hostbridge for family10h and 11h, and
showing the correct numa_node information. For the newer systems, it does not
fill the mp_bus_to_node[], and result in the value -1.
Please refer to the following email thread for more information:
http://marc.info/?l=linux-kernel&m=139405365524526&w=2
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