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Subject[PATCH 2/5] x86: Store CPU topology information for multi-node processors

Introduce cpu_node_map, i.e. map of CPUs on same internal node.
CPUs with matching phys_proc_id and cpu_node_id belong to the same
cpu_node.

Signed-off-by: Andreas Herrmann <andreas.herrmann3@amd.com>
---
arch/x86/include/asm/processor.h | 2 ++
arch/x86/include/asm/smp.h | 6 ++++++
arch/x86/kernel/smpboot.c | 12 ++++++++++++
3 files changed, 20 insertions(+), 0 deletions(-)
diff --git a/arch/x86/include/asm/processor.h b/arch/x86/include/asm/processor.h
index 2b03f70..0e0b363 100644
--- a/arch/x86/include/asm/processor.h
+++ b/arch/x86/include/asm/processor.h
@@ -107,6 +107,8 @@ struct cpuinfo_x86 {
u16 booted_cores;
/* Physical processor id: */
u16 phys_proc_id;
+ /* Node id in case of multi-node processor: */
+ u16 cpu_node_id;
/* Core id: */
u16 cpu_core_id;
/* Index into per_cpu list: */
diff --git a/arch/x86/include/asm/smp.h b/arch/x86/include/asm/smp.h
index 6a84ed1..aad37c6 100644
--- a/arch/x86/include/asm/smp.h
+++ b/arch/x86/include/asm/smp.h
@@ -22,6 +22,7 @@ extern int smp_num_siblings;
extern unsigned int num_processors;

DECLARE_PER_CPU(cpumask_var_t, cpu_sibling_map);
+DECLARE_PER_CPU(cpumask_var_t, cpu_node_map);
DECLARE_PER_CPU(cpumask_var_t, cpu_core_map);
DECLARE_PER_CPU(u16, cpu_llc_id);
DECLARE_PER_CPU(int, cpu_number);
@@ -31,6 +32,11 @@ static inline struct cpumask *cpu_sibling_mask(int cpu)
return per_cpu(cpu_sibling_map, cpu);
}

+static inline struct cpumask *cpu_node_mask(int cpu)
+{
+ return per_cpu(cpu_node_map, cpu);
+}
+
static inline struct cpumask *cpu_core_mask(int cpu)
{
return per_cpu(cpu_core_map, cpu);
diff --git a/arch/x86/kernel/smpboot.c b/arch/x86/kernel/smpboot.c
index 4701f90..b80b46b 100644
--- a/arch/x86/kernel/smpboot.c
+++ b/arch/x86/kernel/smpboot.c
@@ -109,6 +109,10 @@ EXPORT_PER_CPU_SYMBOL(cpu_sibling_map);
DEFINE_PER_CPU(cpumask_var_t, cpu_core_map);
EXPORT_PER_CPU_SYMBOL(cpu_core_map);

+/* representing node silbings on multi-node CPU */
+DEFINE_PER_CPU(cpumask_var_t, cpu_node_map);
+EXPORT_PER_CPU_SYMBOL(cpu_node_map);
+
/* Per CPU bogomips and other parameters */
DEFINE_PER_CPU_SHARED_ALIGNED(struct cpuinfo_x86, cpu_info);
EXPORT_PER_CPU_SYMBOL(cpu_info);
@@ -403,6 +407,11 @@ void __cpuinit set_cpu_sibling_map(int cpu)
cpumask_set_cpu(i, c->llc_shared_map);
cpumask_set_cpu(cpu, cpu_data(i).llc_shared_map);
}
+ if ((c->phys_proc_id == cpu_data(i).phys_proc_id) &&
+ (c->cpu_node_id == cpu_data(i).cpu_node_id)) {
+ cpumask_set_cpu(i, cpu_node_mask(cpu));
+ cpumask_set_cpu(cpu, cpu_node_mask(i));
+ }
if (c->phys_proc_id == cpu_data(i).phys_proc_id) {
cpumask_set_cpu(i, cpu_core_mask(cpu));
cpumask_set_cpu(cpu, cpu_core_mask(i));
@@ -1062,6 +1071,7 @@ void __init native_smp_prepare_cpus(unsigned int max_cpus)
zalloc_cpumask_var(&per_cpu(cpu_sibling_map, i), GFP_KERNEL);
zalloc_cpumask_var(&per_cpu(cpu_core_map, i), GFP_KERNEL);
zalloc_cpumask_var(&cpu_data(i).llc_shared_map, GFP_KERNEL);
+ zalloc_cpumask_var(&per_cpu(cpu_node_map, i), GFP_KERNEL);
}
set_cpu_sibling_map(0);

@@ -1221,6 +1231,7 @@ static void remove_siblinginfo(int cpu)

for_each_cpu(sibling, cpu_core_mask(cpu)) {
cpumask_clear_cpu(cpu, cpu_core_mask(sibling));
+ cpumask_clear_cpu(cpu, cpu_node_mask(sibling));
/*/
* last thread sibling in this cpu core going down
*/
@@ -1233,6 +1244,7 @@ static void remove_siblinginfo(int cpu)
cpumask_clear(cpu_sibling_mask(cpu));
cpumask_clear(cpu_core_mask(cpu));
c->phys_proc_id = 0;
+ c->cpu_node_id = 0;
c->cpu_core_id = 0;
cpumask_clear_cpu(cpu, cpu_sibling_setup_mask);
}
--
1.6.4




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