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Message-ID: <20200727185249.GA26602@in.ibm.com>
Date: Tue, 28 Jul 2020 00:22:49 +0530
From: Gautham R Shenoy <ego@...ux.vnet.ibm.com>
To: Srikar Dronamraju <srikar@...ux.vnet.ibm.com>
Cc: Michael Ellerman <mpe@...erman.id.au>,
linuxppc-dev <linuxppc-dev@...ts.ozlabs.org>,
LKML <linux-kernel@...r.kernel.org>,
Nicholas Piggin <npiggin@...il.com>,
Anton Blanchard <anton@...abs.org>,
"Oliver O'Halloran" <oohall@...il.com>,
Nathan Lynch <nathanl@...ux.ibm.com>,
Michael Neuling <mikey@...ling.org>,
Gautham R Shenoy <ego@...ux.vnet.ibm.com>,
Ingo Molnar <mingo@...nel.org>,
Peter Zijlstra <peterz@...radead.org>,
Valentin Schneider <valentin.schneider@....com>,
Jordan Niethe <jniethe5@...il.com>
Subject: Re: [PATCH v4 09/10] Powerpc/smp: Create coregroup domain
Hi Srikar,
On Mon, Jul 27, 2020 at 11:02:29AM +0530, Srikar Dronamraju wrote:
> Add percpu coregroup maps and masks to create coregroup domain.
> If a coregroup doesn't exist, the coregroup domain will be degenerated
> in favour of SMT/CACHE domain.
>
> Cc: linuxppc-dev <linuxppc-dev@...ts.ozlabs.org>
> Cc: LKML <linux-kernel@...r.kernel.org>
> Cc: Michael Ellerman <mpe@...erman.id.au>
> Cc: Nicholas Piggin <npiggin@...il.com>
> Cc: Anton Blanchard <anton@...abs.org>
> Cc: Oliver O'Halloran <oohall@...il.com>
> Cc: Nathan Lynch <nathanl@...ux.ibm.com>
> Cc: Michael Neuling <mikey@...ling.org>
> Cc: Gautham R Shenoy <ego@...ux.vnet.ibm.com>
> Cc: Ingo Molnar <mingo@...nel.org>
> Cc: Peter Zijlstra <peterz@...radead.org>
> Cc: Valentin Schneider <valentin.schneider@....com>
> Cc: Jordan Niethe <jniethe5@...il.com>
> Signed-off-by: Srikar Dronamraju <srikar@...ux.vnet.ibm.com>
This version looks good to me.
Reviewed-by: Gautham R. Shenoy <ego@...ux.vnet.ibm.com>
> ---
> Changelog v3 ->v4:
> if coregroup_support doesn't exist, update MC mask to the next
> smaller domain mask.
>
> Changelog v2 -> v3:
> Add optimization for mask updation under coregroup_support
>
> Changelog v1 -> v2:
> Moved coregroup topology fixup to fixup_topology (Gautham)
>
> arch/powerpc/include/asm/topology.h | 10 +++++++
> arch/powerpc/kernel/smp.c | 44 +++++++++++++++++++++++++++++
> arch/powerpc/mm/numa.c | 5 ++++
> 3 files changed, 59 insertions(+)
>
> diff --git a/arch/powerpc/include/asm/topology.h b/arch/powerpc/include/asm/topology.h
> index f0b6300e7dd3..6609174918ab 100644
> --- a/arch/powerpc/include/asm/topology.h
> +++ b/arch/powerpc/include/asm/topology.h
> @@ -88,12 +88,22 @@ static inline int cpu_distance(__be32 *cpu1_assoc, __be32 *cpu2_assoc)
>
> #if defined(CONFIG_NUMA) && defined(CONFIG_PPC_SPLPAR)
> extern int find_and_online_cpu_nid(int cpu);
> +extern int cpu_to_coregroup_id(int cpu);
> #else
> static inline int find_and_online_cpu_nid(int cpu)
> {
> return 0;
> }
>
> +static inline int cpu_to_coregroup_id(int cpu)
> +{
> +#ifdef CONFIG_SMP
> + return cpu_to_core_id(cpu);
> +#else
> + return 0;
> +#endif
> +}
> +
> #endif /* CONFIG_NUMA && CONFIG_PPC_SPLPAR */
>
> #include <asm-generic/topology.h>
> diff --git a/arch/powerpc/kernel/smp.c b/arch/powerpc/kernel/smp.c
> index dab96a1203ec..95f0bf72e283 100644
> --- a/arch/powerpc/kernel/smp.c
> +++ b/arch/powerpc/kernel/smp.c
> @@ -80,6 +80,7 @@ DEFINE_PER_CPU(cpumask_var_t, cpu_sibling_map);
> DEFINE_PER_CPU(cpumask_var_t, cpu_smallcore_map);
> DEFINE_PER_CPU(cpumask_var_t, cpu_l2_cache_map);
> DEFINE_PER_CPU(cpumask_var_t, cpu_core_map);
> +DEFINE_PER_CPU(cpumask_var_t, cpu_coregroup_map);
>
> EXPORT_PER_CPU_SYMBOL(cpu_sibling_map);
> EXPORT_PER_CPU_SYMBOL(cpu_l2_cache_map);
> @@ -91,6 +92,7 @@ enum {
> smt_idx,
> #endif
> bigcore_idx,
> + mc_idx,
> die_idx,
> };
>
> @@ -869,6 +871,21 @@ static const struct cpumask *smallcore_smt_mask(int cpu)
> }
> #endif
>
> +static struct cpumask *cpu_coregroup_mask(int cpu)
> +{
> + return per_cpu(cpu_coregroup_map, cpu);
> +}
> +
> +static bool has_coregroup_support(void)
> +{
> + return coregroup_enabled;
> +}
> +
> +static const struct cpumask *cpu_mc_mask(int cpu)
> +{
> + return cpu_coregroup_mask(cpu);
> +}
> +
> static const struct cpumask *cpu_bigcore_mask(int cpu)
> {
> return per_cpu(cpu_sibling_map, cpu);
> @@ -879,6 +896,7 @@ static struct sched_domain_topology_level powerpc_topology[] = {
> { cpu_smt_mask, powerpc_smt_flags, SD_INIT_NAME(SMT) },
> #endif
> { cpu_bigcore_mask, SD_INIT_NAME(BIGCORE) },
> + { cpu_mc_mask, SD_INIT_NAME(MC) },
> { cpu_cpu_mask, SD_INIT_NAME(DIE) },
> { NULL, },
> };
> @@ -925,6 +943,10 @@ void __init smp_prepare_cpus(unsigned int max_cpus)
> GFP_KERNEL, cpu_to_node(cpu));
> zalloc_cpumask_var_node(&per_cpu(cpu_core_map, cpu),
> GFP_KERNEL, cpu_to_node(cpu));
> + if (has_coregroup_support())
> + zalloc_cpumask_var_node(&per_cpu(cpu_coregroup_map, cpu),
> + GFP_KERNEL, cpu_to_node(cpu));
> +
> #ifdef CONFIG_NEED_MULTIPLE_NODES
> /*
> * numa_node_id() works after this.
> @@ -942,6 +964,9 @@ void __init smp_prepare_cpus(unsigned int max_cpus)
> cpumask_set_cpu(boot_cpuid, cpu_l2_cache_mask(boot_cpuid));
> cpumask_set_cpu(boot_cpuid, cpu_core_mask(boot_cpuid));
>
> + if (has_coregroup_support())
> + cpumask_set_cpu(boot_cpuid, cpu_coregroup_mask(boot_cpuid));
> +
> init_big_cores();
> if (has_big_cores) {
> cpumask_set_cpu(boot_cpuid,
> @@ -1233,6 +1258,8 @@ static void remove_cpu_from_masks(int cpu)
> set_cpus_unrelated(cpu, i, cpu_sibling_mask);
> if (has_big_cores)
> set_cpus_unrelated(cpu, i, cpu_smallcore_mask);
> + if (has_coregroup_support())
> + set_cpus_unrelated(cpu, i, cpu_coregroup_mask);
> }
> }
> #endif
> @@ -1293,6 +1320,20 @@ static void add_cpu_to_masks(int cpu)
> add_cpu_to_smallcore_masks(cpu);
> update_mask_by_l2(cpu, cpu_l2_cache_mask);
>
> + if (has_coregroup_support()) {
> + int coregroup_id = cpu_to_coregroup_id(cpu);
> +
> + cpumask_set_cpu(cpu, cpu_coregroup_mask(cpu));
> + for_each_cpu_and(i, cpu_online_mask, cpu_cpu_mask(cpu)) {
> + int fcpu = cpu_first_thread_sibling(i);
> +
> + if (fcpu == first_thread)
> + set_cpus_related(cpu, i, cpu_coregroup_mask);
> + else if (coregroup_id == cpu_to_coregroup_id(i))
> + set_cpus_related(cpu, i, cpu_coregroup_mask);
> + }
> + }
> +
> if (pkg_id == -1) {
> struct cpumask *(*mask)(int) = cpu_sibling_mask;
>
> @@ -1398,6 +1439,9 @@ static void fixup_topology(void)
> powerpc_topology[bigcore_idx].name = "CACHE";
> #endif
> }
> +
> + if (!has_coregroup_support())
> + powerpc_topology[mc_idx].mask = powerpc_topology[bigcore_idx].mask;
> }
>
> void __init smp_cpus_done(unsigned int max_cpus)
> diff --git a/arch/powerpc/mm/numa.c b/arch/powerpc/mm/numa.c
> index 51cb672f113b..0d57779e7942 100644
> --- a/arch/powerpc/mm/numa.c
> +++ b/arch/powerpc/mm/numa.c
> @@ -1216,6 +1216,11 @@ int find_and_online_cpu_nid(int cpu)
> return new_nid;
> }
>
> +int cpu_to_coregroup_id(int cpu)
> +{
> + return cpu_to_core_id(cpu);
> +}
> +
> static int topology_update_init(void)
> {
> topology_inited = 1;
> --
> 2.17.1
>
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