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Date:   Thu, 6 Jun 2019 07:25:01 -0700
From:   Atish Patra <atish.patra@....com>
To:     Russell King <linux@...linux.org.uk>
Cc:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Sudeep Holla <sudeep.holla@....com>,
        Albert Ou <aou@...s.berkeley.edu>,
        Anup Patel <anup@...infault.org>,
        Catalin Marinas <catalin.marinas@....com>,
        "David S. Miller" <davem@...emloft.net>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Ingo Molnar <mingo@...nel.org>,
        Jeremy Linton <jeremy.linton@....com>,
        Linus Walleij <linus.walleij@...aro.org>,
        "linux-riscv@...ts.infradead.org" <linux-riscv@...ts.infradead.org>,
        Mark Rutland <mark.rutland@....com>,
        Mauro Carvalho Chehab <mchehab+samsung@...nel.org>,
        Morten Rasmussen <morten.rasmussen@....com>,
        Otto Sabart <ottosabart@...erm.com>,
        Palmer Dabbelt <palmer@...ive.com>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        "Peter Zijlstra (Intel)" <peterz@...radead.org>,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Will Deacon <will.deacon@....com>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH v6 4/7] arm: Use common cpu_topology structure and
 functions.

On 5/29/19 2:15 PM, Atish Patra wrote:
> Currently, ARM32 and ARM64 uses different data structures to represent
> their cpu topologies. Since, we are moving the ARM64 topology to common
> code to be used by other architectures, we can reuse that for ARM32 as
> well.
> 
> Take this opprtunity to remove the redundant functions from ARM32 and
> reuse the common code instead.
> 
> To: Russell King <linux@...linux.org.uk>
> Signed-off-by: Atish Patra <atish.patra@....com>
> Tested-by: Sudeep Holla <sudeep.holla@....com> (on TC2)
> Reviewed-by : Sudeep Holla <sudeep.holla@....com>
> 
> ---
> Hi Russell,
> Can we get a ACK for this patch ? We are hoping that the entire
> series can be merged at one go.
> ---
>   arch/arm/include/asm/topology.h | 20 -----------
>   arch/arm/kernel/topology.c      | 60 ++++-----------------------------
>   drivers/base/arch_topology.c    |  4 ++-
>   include/linux/arch_topology.h   |  6 ++--
>   4 files changed, 11 insertions(+), 79 deletions(-)
> 
> diff --git a/arch/arm/include/asm/topology.h b/arch/arm/include/asm/topology.h
> index 2a786f54d8b8..8a0fae94d45e 100644
> --- a/arch/arm/include/asm/topology.h
> +++ b/arch/arm/include/asm/topology.h
> @@ -5,26 +5,6 @@
>   #ifdef CONFIG_ARM_CPU_TOPOLOGY
>   
>   #include <linux/cpumask.h>
> -
> -struct cputopo_arm {
> -	int thread_id;
> -	int core_id;
> -	int socket_id;
> -	cpumask_t thread_sibling;
> -	cpumask_t core_sibling;
> -};
> -
> -extern struct cputopo_arm cpu_topology[NR_CPUS];
> -
> -#define topology_physical_package_id(cpu)	(cpu_topology[cpu].socket_id)
> -#define topology_core_id(cpu)		(cpu_topology[cpu].core_id)
> -#define topology_core_cpumask(cpu)	(&cpu_topology[cpu].core_sibling)
> -#define topology_sibling_cpumask(cpu)	(&cpu_topology[cpu].thread_sibling)
> -
> -void init_cpu_topology(void);
> -void store_cpu_topology(unsigned int cpuid);
> -const struct cpumask *cpu_coregroup_mask(int cpu);
> -
>   #include <linux/arch_topology.h>
>   
>   /* Replace task scheduler's default frequency-invariant accounting */
> diff --git a/arch/arm/kernel/topology.c b/arch/arm/kernel/topology.c
> index 60e375ce1ab2..238f1da0219c 100644
> --- a/arch/arm/kernel/topology.c
> +++ b/arch/arm/kernel/topology.c
> @@ -177,17 +177,6 @@ static inline void parse_dt_topology(void) {}
>   static inline void update_cpu_capacity(unsigned int cpuid) {}
>   #endif
>   
> - /*
> - * cpu topology table
> - */
> -struct cputopo_arm cpu_topology[NR_CPUS];
> -EXPORT_SYMBOL_GPL(cpu_topology);
> -
> -const struct cpumask *cpu_coregroup_mask(int cpu)
> -{
> -	return &cpu_topology[cpu].core_sibling;
> -}
> -
>   /*
>    * The current assumption is that we can power gate each core independently.
>    * This will be superseded by DT binding once available.
> @@ -197,32 +186,6 @@ const struct cpumask *cpu_corepower_mask(int cpu)
>   	return &cpu_topology[cpu].thread_sibling;
>   }
>   
> -static void update_siblings_masks(unsigned int cpuid)
> -{
> -	struct cputopo_arm *cpu_topo, *cpuid_topo = &cpu_topology[cpuid];
> -	int cpu;
> -
> -	/* update core and thread sibling masks */
> -	for_each_possible_cpu(cpu) {
> -		cpu_topo = &cpu_topology[cpu];
> -
> -		if (cpuid_topo->socket_id != cpu_topo->socket_id)
> -			continue;
> -
> -		cpumask_set_cpu(cpuid, &cpu_topo->core_sibling);
> -		if (cpu != cpuid)
> -			cpumask_set_cpu(cpu, &cpuid_topo->core_sibling);
> -
> -		if (cpuid_topo->core_id != cpu_topo->core_id)
> -			continue;
> -
> -		cpumask_set_cpu(cpuid, &cpu_topo->thread_sibling);
> -		if (cpu != cpuid)
> -			cpumask_set_cpu(cpu, &cpuid_topo->thread_sibling);
> -	}
> -	smp_wmb();
> -}
> -
>   /*
>    * store_cpu_topology is called at boot when only one cpu is running
>    * and with the mutex cpu_hotplug.lock locked, when several cpus have booted,
> @@ -230,7 +193,7 @@ static void update_siblings_masks(unsigned int cpuid)
>    */
>   void store_cpu_topology(unsigned int cpuid)
>   {
> -	struct cputopo_arm *cpuid_topo = &cpu_topology[cpuid];
> +	struct cpu_topology *cpuid_topo = &cpu_topology[cpuid];
>   	unsigned int mpidr;
>   
>   	/* If the cpu topology has been already set, just return */
> @@ -250,12 +213,12 @@ void store_cpu_topology(unsigned int cpuid)
>   			/* core performance interdependency */
>   			cpuid_topo->thread_id = MPIDR_AFFINITY_LEVEL(mpidr, 0);
>   			cpuid_topo->core_id = MPIDR_AFFINITY_LEVEL(mpidr, 1);
> -			cpuid_topo->socket_id = MPIDR_AFFINITY_LEVEL(mpidr, 2);
> +			cpuid_topo->package_id = MPIDR_AFFINITY_LEVEL(mpidr, 2);
>   		} else {
>   			/* largely independent cores */
>   			cpuid_topo->thread_id = -1;
>   			cpuid_topo->core_id = MPIDR_AFFINITY_LEVEL(mpidr, 0);
> -			cpuid_topo->socket_id = MPIDR_AFFINITY_LEVEL(mpidr, 1);
> +			cpuid_topo->package_id = MPIDR_AFFINITY_LEVEL(mpidr, 1);
>   		}
>   	} else {
>   		/*
> @@ -265,7 +228,7 @@ void store_cpu_topology(unsigned int cpuid)
>   		 */
>   		cpuid_topo->thread_id = -1;
>   		cpuid_topo->core_id = 0;
> -		cpuid_topo->socket_id = -1;
> +		cpuid_topo->package_id = -1;
>   	}
>   
>   	update_siblings_masks(cpuid);
> @@ -275,7 +238,7 @@ void store_cpu_topology(unsigned int cpuid)
>   	pr_info("CPU%u: thread %d, cpu %d, socket %d, mpidr %x\n",
>   		cpuid, cpu_topology[cpuid].thread_id,
>   		cpu_topology[cpuid].core_id,
> -		cpu_topology[cpuid].socket_id, mpidr);
> +		cpu_topology[cpuid].package_id, mpidr);
>   }
>   
>   static inline int cpu_corepower_flags(void)
> @@ -298,18 +261,7 @@ static struct sched_domain_topology_level arm_topology[] = {
>    */
>   void __init init_cpu_topology(void)
>   {
> -	unsigned int cpu;
> -
> -	/* init core mask and capacity */
> -	for_each_possible_cpu(cpu) {
> -		struct cputopo_arm *cpu_topo = &(cpu_topology[cpu]);
> -
> -		cpu_topo->thread_id = -1;
> -		cpu_topo->core_id =  -1;
> -		cpu_topo->socket_id = -1;
> -		cpumask_clear(&cpu_topo->core_sibling);
> -		cpumask_clear(&cpu_topo->thread_sibling);
> -	}
> +	reset_cpu_topology();
>   	smp_wmb();
>   
>   	parse_dt_topology();
> diff --git a/drivers/base/arch_topology.c b/drivers/base/arch_topology.c
> index 5781bb4c457c..797e3cd71bea 100644
> --- a/drivers/base/arch_topology.c
> +++ b/drivers/base/arch_topology.c
> @@ -426,6 +426,7 @@ static int __init parse_dt_topology(void)
>   	of_node_put(cn);
>   	return ret;
>   }
> +#endif
>   
>   /*
>    * cpu topology table
> @@ -491,7 +492,7 @@ static void clear_cpu_topology(int cpu)
>   	cpumask_set_cpu(cpu, &cpu_topo->thread_sibling);
>   }
>   
> -static void __init reset_cpu_topology(void)
> +void __init reset_cpu_topology(void)
>   {
>   	unsigned int cpu;
>   
> @@ -526,6 +527,7 @@ __weak int __init parse_acpi_topology(void)
>   	return 0;
>   }
>   
> +#if defined(CONFIG_ARM64) || defined(CONFIG_RISCV)
>   void __init init_cpu_topology(void)
>   {
>   	reset_cpu_topology();
> diff --git a/include/linux/arch_topology.h b/include/linux/arch_topology.h
> index d4e76e0a283f..d4311127970d 100644
> --- a/include/linux/arch_topology.h
> +++ b/include/linux/arch_topology.h
> @@ -54,11 +54,9 @@ extern struct cpu_topology cpu_topology[NR_CPUS];
>   void init_cpu_topology(void);
>   void store_cpu_topology(unsigned int cpuid);
>   const struct cpumask *cpu_coregroup_mask(int cpu);
> -#endif
> -
> -#if defined(CONFIG_ARM64) || defined(CONFIG_RISCV)
>   void update_siblings_masks(unsigned int cpu);
> -#endif
>   void remove_cpu_topology(unsigned int cpuid);
> +void reset_cpu_topology(void);
> +#endif
>   
>   #endif /* _LINUX_ARCH_TOPOLOGY_H_ */
> 
Hi Russell,
Can we get an ACK for ARM if you don't have any objection to the series ?

-- 
Regards,
Atish

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