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Date: Tue, 19 Feb 2019 11:56:55 -0500
From: "Liang, Kan" <kan.liang@...ux.intel.com>
To: Len Brown <lenb@...nel.org>, x86@...nel.org
Cc: linux-kernel@...r.kernel.org, Len Brown <len.brown@...el.com>,
linux-doc@...r.kernel.org
Subject: Re: [PATCH 05/11] x86 topology: export die_siblings
On 2/18/2019 10:40 PM, Len Brown wrote:
> From: Len Brown <len.brown@...el.com>
>
> 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@...el.com>
> Cc: linux-doc@...r.kernel.org
> Signed-off-by: Len Brown <len.brown@...el.com>
> ---
> 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))
Could you please update the document regarding to topology_die_cpumask
and topology_core_cpumask in Documentation/x86/topology.txt
Thanks,
Kan
> #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)
>
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