[PATCH 05/11] x86 topology: export die_siblings

From: Len Brown
Date: Mon Feb 18 2019 - 22:40:56 EST

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From: Len Brown <len.brown@xxxxxxxxx>

like core_siblings, except it shows which die are in the same package.

This is needed for lscpu(1) to correctly display die topology.

Signed-off-by: Len Brown <len.brown@xxxxxxxxx>
Cc: linux-doc@xxxxxxxxxxxxxxx
Signed-off-by: Len Brown <len.brown@xxxxxxxxx>
---
Documentation/cputopology.txt | 10 ++++++++++
arch/x86/include/asm/smp.h | 1 +
arch/x86/include/asm/topology.h | 1 +
arch/x86/kernel/smpboot.c | 20 ++++++++++++++++++++
arch/x86/xen/smp_pv.c | 1 +
drivers/base/topology.c | 6 ++++++
include/linux/topology.h | 3 +++
7 files changed, 42 insertions(+)

diff --git a/Documentation/cputopology.txt b/Documentation/cputopology.txt
index 287213b4517b..7dd2ae3df233 100644
--- a/Documentation/cputopology.txt
+++ b/Documentation/cputopology.txt
@@ -56,6 +56,16 @@ core_siblings_list:
human-readable list of cpuX's hardware threads within the same
die_id.

+die_siblings:
+
+ internal kernel map of cpuX's hardware threads within the same
+ physical_package_id.
+
+die_siblings_list:
+
+ human-readable list of cpuX's hardware threads within the same
+ physical_package_id.
+
book_siblings:

internal kernel map of cpuX's hardware threads within the same
diff --git a/arch/x86/include/asm/smp.h b/arch/x86/include/asm/smp.h
index 2e95b6c1bca3..39266d193597 100644
--- a/arch/x86/include/asm/smp.h
+++ b/arch/x86/include/asm/smp.h
@@ -23,6 +23,7 @@ extern unsigned int num_processors;

DECLARE_PER_CPU_READ_MOSTLY(cpumask_var_t, cpu_sibling_map);
DECLARE_PER_CPU_READ_MOSTLY(cpumask_var_t, cpu_core_map);
+DECLARE_PER_CPU_READ_MOSTLY(cpumask_var_t, cpu_die_map);
/* cpus sharing the last level cache: */
DECLARE_PER_CPU_READ_MOSTLY(cpumask_var_t, cpu_llc_shared_map);
DECLARE_PER_CPU_READ_MOSTLY(u16, cpu_llc_id);
diff --git a/arch/x86/include/asm/topology.h b/arch/x86/include/asm/topology.h
index 281be6bbc80d..a52a572147ba 100644
--- a/arch/x86/include/asm/topology.h
+++ b/arch/x86/include/asm/topology.h
@@ -110,6 +110,7 @@ extern const struct cpumask *cpu_coregroup_mask(int cpu);
#define topology_core_id(cpu) (cpu_data(cpu).cpu_core_id)

#ifdef CONFIG_SMP
+#define topology_die_cpumask(cpu) (per_cpu(cpu_die_map, cpu))
#define topology_core_cpumask(cpu) (per_cpu(cpu_core_map, cpu))
#define topology_sibling_cpumask(cpu) (per_cpu(cpu_sibling_map, cpu))

diff --git a/arch/x86/kernel/smpboot.c b/arch/x86/kernel/smpboot.c
index 4250a87f57db..42d37e4a1918 100644
--- a/arch/x86/kernel/smpboot.c
+++ b/arch/x86/kernel/smpboot.c
@@ -90,6 +90,10 @@ EXPORT_PER_CPU_SYMBOL(cpu_sibling_map);
DEFINE_PER_CPU_READ_MOSTLY(cpumask_var_t, cpu_core_map);
EXPORT_PER_CPU_SYMBOL(cpu_core_map);

+/* representing HT and core and die siblings of each logical CPU */
+DEFINE_PER_CPU_READ_MOSTLY(cpumask_var_t, cpu_die_map);
+EXPORT_PER_CPU_SYMBOL(cpu_die_map);
+
DEFINE_PER_CPU_READ_MOSTLY(cpumask_var_t, cpu_llc_shared_map);

/* Per CPU bogomips and other parameters */
@@ -461,6 +465,12 @@ static bool match_llc(struct cpuinfo_x86 *c, struct cpuinfo_x86 *o)
* multicore group inside a NUMA node. If this happens, we will
* discard the MC level of the topology later.
*/
+static bool match_pkg(struct cpuinfo_x86 *c, struct cpuinfo_x86 *o)
+{
+ if (c->phys_proc_id == o->phys_proc_id)
+ return true;
+ return false;
+}
static bool match_die(struct cpuinfo_x86 *c, struct cpuinfo_x86 *o)
{
if (c->cpu_die_id == o->cpu_die_id)
@@ -530,6 +540,7 @@ void set_cpu_sibling_map(int cpu)
cpumask_set_cpu(cpu, topology_sibling_cpumask(cpu));
cpumask_set_cpu(cpu, cpu_llc_shared_mask(cpu));
cpumask_set_cpu(cpu, topology_core_cpumask(cpu));
+ cpumask_set_cpu(cpu, topology_die_cpumask(cpu));
c->booted_cores = 1;
return;
}
@@ -576,8 +587,12 @@ void set_cpu_sibling_map(int cpu)
} else if (i != cpu && !c->booted_cores)
c->booted_cores = cpu_data(i).booted_cores;
}
+
if (match_die(c, o) && !topology_same_node(c, o))
x86_has_numa_in_package = true;
+
+ if ((i == cpu) || (has_mp && match_pkg(c, o)))
+ link_mask(topology_die_cpumask, cpu, i);
}

threads = cpumask_weight(topology_sibling_cpumask(cpu));
@@ -1173,6 +1188,7 @@ static __init void disable_smp(void)
physid_set_mask_of_physid(0, &phys_cpu_present_map);
cpumask_set_cpu(0, topology_sibling_cpumask(0));
cpumask_set_cpu(0, topology_core_cpumask(0));
+ cpumask_set_cpu(0, topology_die_cpumask(0));
}

/*
@@ -1268,6 +1284,7 @@ void __init native_smp_prepare_cpus(unsigned int max_cpus)
for_each_possible_cpu(i) {
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(&per_cpu(cpu_die_map, i), GFP_KERNEL);
zalloc_cpumask_var(&per_cpu(cpu_llc_shared_map, i), GFP_KERNEL);
}

@@ -1488,6 +1505,8 @@ static void remove_siblinginfo(int cpu)
cpu_data(sibling).booted_cores--;
}

+ for_each_cpu(sibling, topology_die_cpumask(cpu))
+ cpumask_clear_cpu(cpu, topology_die_cpumask(sibling));
for_each_cpu(sibling, topology_sibling_cpumask(cpu))
cpumask_clear_cpu(cpu, topology_sibling_cpumask(sibling));
for_each_cpu(sibling, cpu_llc_shared_mask(cpu))
@@ -1495,6 +1514,7 @@ static void remove_siblinginfo(int cpu)
cpumask_clear(cpu_llc_shared_mask(cpu));
cpumask_clear(topology_sibling_cpumask(cpu));
cpumask_clear(topology_core_cpumask(cpu));
+ cpumask_clear(topology_die_cpumask(cpu));
c->cpu_core_id = 0;
c->booted_cores = 0;
cpumask_clear_cpu(cpu, cpu_sibling_setup_mask);
diff --git a/arch/x86/xen/smp_pv.c b/arch/x86/xen/smp_pv.c
index 145506f9fdbe..ac13b0be8448 100644
--- a/arch/x86/xen/smp_pv.c
+++ b/arch/x86/xen/smp_pv.c
@@ -251,6 +251,7 @@ static void __init xen_pv_smp_prepare_cpus(unsigned int max_cpus)
for_each_possible_cpu(i) {
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(&per_cpu(cpu_die_map, i), GFP_KERNEL);
zalloc_cpumask_var(&per_cpu(cpu_llc_shared_map, i), GFP_KERNEL);
}
set_cpu_sibling_map(0);
diff --git a/drivers/base/topology.c b/drivers/base/topology.c
index 50352cf96f85..5b1317ae3262 100644
--- a/drivers/base/topology.c
+++ b/drivers/base/topology.c
@@ -57,6 +57,10 @@ define_siblings_show_func(core_siblings, core_cpumask);
static DEVICE_ATTR_RO(core_siblings);
static DEVICE_ATTR_RO(core_siblings_list);

+define_siblings_show_func(die_siblings, die_cpumask);
+static DEVICE_ATTR_RO(die_siblings);
+static DEVICE_ATTR_RO(die_siblings_list);
+
#ifdef CONFIG_SCHED_BOOK
define_id_show_func(book_id);
static DEVICE_ATTR_RO(book_id);
@@ -81,6 +85,8 @@ static struct attribute *default_attrs[] = {
&dev_attr_thread_siblings_list.attr,
&dev_attr_core_siblings.attr,
&dev_attr_core_siblings_list.attr,
+ &dev_attr_die_siblings.attr,
+ &dev_attr_die_siblings_list.attr,
#ifdef CONFIG_SCHED_BOOK
&dev_attr_book_id.attr,
&dev_attr_book_siblings.attr,
diff --git a/include/linux/topology.h b/include/linux/topology.h
index 5cc8595dd0e4..47a3e3c08036 100644
--- a/include/linux/topology.h
+++ b/include/linux/topology.h
@@ -196,6 +196,9 @@ static inline int cpu_to_mem(int cpu)
#ifndef topology_core_cpumask
#define topology_core_cpumask(cpu) cpumask_of(cpu)
#endif
+#ifndef topology_die_cpumask
+#define topology_die_cpumask(cpu) cpumask_of(cpu)
+#endif

#ifdef CONFIG_SCHED_SMT
static inline const struct cpumask *cpu_smt_mask(int cpu)
--
2.18.0-rc0

Next message: Len Brown: "[PATCH 07/11] powercap/intel_rapl: simplify rapl_find_package()"
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Next in thread: Liang, Kan: "Re: [PATCH 05/11] x86 topology: export die_siblings"
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