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MIPS: Support CPU topology files in sysfs

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This patch is prepared for Loongson's NUMA support, it offer meaningful
sysfs files such as physical_package_id, core_id, core_siblings and
thread_siblings in /sys/devices/system/cpu/cpu?/topology.

Signed-off-by: Huacai Chen <chenhc@lemote.com>
Reviewed-by: Andreas Herrmann <andreas.herrmann@caviumnetworks.com>
Cc: John Crispin <john@phrozen.org>
Cc: Steven J. Hill <Steven.Hill@imgtec.com>
Cc: Aurelien Jarno <aurelien@aurel32.net>
Cc: linux-mips@linux-mips.org
Cc: Fuxin Zhang <zhangfx@lemote.com>
Cc: Zhangjin Wu <wuzhangjin@gmail.com>
Patchwork: https://patchwork.linux-mips.org/patch/7184/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
This commit is contained in:
Huacai Chen
2014-06-26 11:41:26 +08:00
committed by Ralf Baechle
parent 0f3f506b27
commit bda4584cd9
4 changed files with 33 additions and 1 deletions
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26
arch/mips/kernel/smp.c
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@@ -59,9 +59,16 @@ EXPORT_SYMBOL(smp_num_siblings);
cpumask_t cpu_sibling_map[NR_CPUS] __read_mostly;
EXPORT_SYMBOL(cpu_sibling_map);
/* representing the core map of multi-core chips of each logical CPU */
cpumask_t cpu_core_map[NR_CPUS] __read_mostly;
EXPORT_SYMBOL(cpu_core_map);
/* representing cpus for which sibling maps can be computed */
static cpumask_t cpu_sibling_setup_map;
/* representing cpus for which core maps can be computed */
static cpumask_t cpu_core_setup_map;
cpumask_t cpu_coherent_mask;
static inline void set_cpu_sibling_map(int cpu)
@@ -72,7 +79,8 @@ static inline void set_cpu_sibling_map(int cpu)
if (smp_num_siblings > 1) {
for_each_cpu_mask(i, cpu_sibling_setup_map) {
if (cpu_data[cpu].core == cpu_data[i].core) {
if (cpu_data[cpu].package == cpu_data[i].package &&
cpu_data[cpu].core == cpu_data[i].core) {
cpu_set(i, cpu_sibling_map[cpu]);
cpu_set(cpu, cpu_sibling_map[i]);
}
@@ -81,6 +89,20 @@ static inline void set_cpu_sibling_map(int cpu)
cpu_set(cpu, cpu_sibling_map[cpu]);
}
static inline void set_cpu_core_map(int cpu)
{
int i;
cpu_set(cpu, cpu_core_setup_map);
for_each_cpu_mask(i, cpu_core_setup_map) {
if (cpu_data[cpu].package == cpu_data[i].package) {
cpu_set(i, cpu_core_map[cpu]);
cpu_set(cpu, cpu_core_map[i]);
}
}
}
struct plat_smp_ops *mp_ops;
EXPORT_SYMBOL(mp_ops);
@@ -122,6 +144,7 @@ asmlinkage void start_secondary(void)
set_cpu_online(cpu, true);
set_cpu_sibling_map(cpu);
set_cpu_core_map(cpu);
cpu_set(cpu, cpu_callin_map);
@@ -175,6 +198,7 @@ void __init smp_prepare_cpus(unsigned int max_cpus)
current_thread_info()->cpu = 0;
mp_ops->prepare_cpus(max_cpus);
set_cpu_sibling_map(0);
set_cpu_core_map(0);
#ifndef CONFIG_HOTPLUG_CPU
init_cpu_present(cpu_possible_mask);
#endif