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| author | Andreas Herrmann <andreas.herrmann3@amd.com> | 2009-04-17 12:01:55 +0200 |
|---|---|---|
| committer | Jesse Barnes <jbarnes@virtuousgeek.org> | 2009-11-06 14:09:15 -0800 |
| commit | e0cd5160346f5b88fe536f529066f102518f8acd (patch) | |
| tree | d6c2ffc944c9ee0d4215287d3b416f2e9712dc10 /drivers/pci/pci-sysfs.c | |
| parent | ea7f1b6ee9dc96c5827b06ba21d7769d553efb7d (diff) | |
| download | lwn-e0cd5160346f5b88fe536f529066f102518f8acd.tar.gz lwn-e0cd5160346f5b88fe536f529066f102518f8acd.zip | |
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>
Diffstat (limited to 'drivers/pci/pci-sysfs.c')
| -rw-r--r-- | drivers/pci/pci-sysfs.c | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/drivers/pci/pci-sysfs.c b/drivers/pci/pci-sysfs.c index 0f6382f090ee..0fa707e2a0f8 100644 --- a/drivers/pci/pci-sysfs.c +++ b/drivers/pci/pci-sysfs.c @@ -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'; |