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Commit bda4584c authored by Huacai Chen's avatar Huacai Chen Committed by Ralf Baechle
Browse files

MIPS: Support CPU topology files in sysfs 



This patch is prepared for Loongson's NUMA support, it offer meaningful
sysfs files such as physical_package_id, core_id, core_siblings and
thread_siblings in /sys/devices/system/cpu/cpu?/topology.

Signed-off-by: default avatarHuacai Chen <chenhc@lemote.com>
Reviewed-by: default avatarAndreas Herrmann <andreas.herrmann@caviumnetworks.com>
Cc: John Crispin <john@phrozen.org>
Cc: Steven J. Hill <Steven.Hill@imgtec.com>
Cc: Aurelien Jarno <aurelien@aurel32.net>
Cc: linux-mips@linux-mips.org
Cc: Fuxin Zhang <zhangfx@lemote.com>
Cc: Zhangjin Wu <wuzhangjin@gmail.com>
Patchwork: https://patchwork.linux-mips.org/patch/7184/


Signed-off-by: default avatarRalf Baechle <ralf@linux-mips.org>
parent 0f3f506b

arch/mips/include/asm/cpu-info.h

+1 −0
Original line number Diff line number Diff line
@@ -61,6 +61,7 @@ struct cpuinfo_mips { 
	struct cache_desc	scache; /* Secondary cache */

	struct cache_desc	tcache; /* Tertiary/split secondary cache */

	int			srsets; /* Shadow register sets */

	int			package;/* physical package number */

	int			core;	/* physical core number */

#ifdef CONFIG_64BIT

	int			vmbits; /* Virtual memory size in bits */

arch/mips/include/asm/smp.h

+6 −0
Original line number Diff line number Diff line
@@ -22,6 +22,7 @@ 


extern int smp_num_siblings;

extern cpumask_t cpu_sibling_map[];

extern cpumask_t cpu_core_map[];



#define raw_smp_processor_id() (current_thread_info()->cpu)
@@ -36,6 +37,11 @@ extern int __cpu_logical_map[NR_CPUS]; 


#define NO_PROC_ID	(-1)



#define topology_physical_package_id(cpu)	(cpu_data[cpu].package)

#define topology_core_id(cpu)			(cpu_data[cpu].core)

#define topology_core_cpumask(cpu)		(&cpu_core_map[cpu])

#define topology_thread_cpumask(cpu)		(&cpu_sibling_map[cpu])



#define SMP_RESCHEDULE_YOURSELF 0x1	/* XXX braindead */

#define SMP_CALL_FUNCTION	0x2

/* Octeon - Tell another core to flush its icache */

arch/mips/kernel/proc.c

+1 −0
Original line number Diff line number Diff line
@@ -123,6 +123,7 @@ static int show_cpuinfo(struct seq_file *m, void *v) 
		      cpu_data[n].srsets);

	seq_printf(m, "kscratch registers\t: %d\n",

		      hweight8(cpu_data[n].kscratch_mask));

	seq_printf(m, "package\t\t\t: %d\n", cpu_data[n].package);

	seq_printf(m, "core\t\t\t: %d\n", cpu_data[n].core);



	sprintf(fmt, "VCE%%c exceptions\t\t: %s\n",

arch/mips/kernel/smp.c

+25 −1
Original line number Diff line number Diff line
@@ -59,9 +59,16 @@ EXPORT_SYMBOL(smp_num_siblings); 
cpumask_t cpu_sibling_map[NR_CPUS] __read_mostly;

EXPORT_SYMBOL(cpu_sibling_map);



/* representing the core map of multi-core chips of each logical CPU */

cpumask_t cpu_core_map[NR_CPUS] __read_mostly;

EXPORT_SYMBOL(cpu_core_map);



/* representing cpus for which sibling maps can be computed */

static cpumask_t cpu_sibling_setup_map;



/* representing cpus for which core maps can be computed */

static cpumask_t cpu_core_setup_map;



cpumask_t cpu_coherent_mask;



static inline void set_cpu_sibling_map(int cpu)
@@ -72,7 +79,8 @@ static inline void set_cpu_sibling_map(int cpu) 


	if (smp_num_siblings > 1) {

		for_each_cpu_mask(i, cpu_sibling_setup_map) {

			if (cpu_data[cpu].core == cpu_data[i].core) {

			if (cpu_data[cpu].package == cpu_data[i].package &&

				    cpu_data[cpu].core == cpu_data[i].core) {

				cpu_set(i, cpu_sibling_map[cpu]);

				cpu_set(cpu, cpu_sibling_map[i]);

			}
@@ -81,6 +89,20 @@ static inline void set_cpu_sibling_map(int cpu) 
		cpu_set(cpu, cpu_sibling_map[cpu]);

}



static inline void set_cpu_core_map(int cpu)

{

	int i;



	cpu_set(cpu, cpu_core_setup_map);



	for_each_cpu_mask(i, cpu_core_setup_map) {

		if (cpu_data[cpu].package == cpu_data[i].package) {

			cpu_set(i, cpu_core_map[cpu]);

			cpu_set(cpu, cpu_core_map[i]);

		}

	}

}



struct plat_smp_ops *mp_ops;

EXPORT_SYMBOL(mp_ops);
@@ -122,6 +144,7 @@ asmlinkage void start_secondary(void) 
	set_cpu_online(cpu, true);



	set_cpu_sibling_map(cpu);

	set_cpu_core_map(cpu);



	cpu_set(cpu, cpu_callin_map);
@@ -175,6 +198,7 @@ void __init smp_prepare_cpus(unsigned int max_cpus) 
	current_thread_info()->cpu = 0;

	mp_ops->prepare_cpus(max_cpus);

	set_cpu_sibling_map(0);

	set_cpu_core_map(0);

#ifndef CONFIG_HOTPLUG_CPU

	init_cpu_present(cpu_possible_mask);

#endif