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PCI: derive nearby CPUs from device's instead of bus' NUMA information 

In case of AMD CPU northbridge functions this NUMA information might
differ.  Here is an example from a 4-socket system.

Currently Linux shows

  root@hagen:/sys/devices/pci0000:00/0000:00:1a.4# cat numa_node
  0
  root@hagen:/sys/devices/pci0000:00/0000:00:1a.4# cat local_cpu*
  0-3
  00000000,0000000f

which is not correct for northbridge functions as the local CPUs
are those of the same socket.

With this patch and a quirk for AMD CPU NB functions Linux can
do better and correctly show

  root@hagen:/sys/devices/pci0000:00/0000:00:1a.4# cat numa_node
  2
  root@hagen:/sys/devices/pci0000:00/0000:00:1a.4# cat local_cpu*
  8-11
  00000000,00000f00

Signed-off-by: Andreas Herrmann <andreas.herrmann3@amd.com>
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
This commit is contained in:
Andreas Herrmann 2009-04-17 12:01:55 +02:00 committed by Jesse Barnes
parent ea7f1b6ee9
commit e0cd516034
1 changed files with 8 additions and 0 deletions
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8
drivers/pci/pci-sysfs.c
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@ -74,7 +74,11 @@ static ssize_t local_cpus_show(struct device *dev,
const struct cpumask *mask;
int len;
#ifdef CONFIG_NUMA
mask = cpumask_of_node(dev_to_node(dev));
#else
mask = cpumask_of_pcibus(to_pci_dev(dev)->bus);
#endif
len = cpumask_scnprintf(buf, PAGE_SIZE-2, mask);
buf[len++] = '\n';
buf[len] = '\0';
@ -88,7 +92,11 @@ static ssize_t local_cpulist_show(struct device *dev,
const struct cpumask *mask;
int len;
#ifdef CONFIG_NUMA
mask = cpumask_of_node(dev_to_node(dev));
#else
mask = cpumask_of_pcibus(to_pci_dev(dev)->bus);
#endif
len = cpulist_scnprintf(buf, PAGE_SIZE-2, mask);
buf[len++] = '\n';
buf[len] = '\0';