From: Andreas Herrmann Date: Fri, 17 Apr 2009 10:01:55 +0000 (+0200) Subject: PCI: derive nearby CPUs from device's instead of bus' NUMA information X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=e0cd516;p=GitHub%2FLineageOS%2Fandroid_kernel_motorola_exynos9610.git 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 Signed-off-by: Jesse Barnes --- 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';