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TOMOYO Linux Cross Reference
Linux/arch/parisc/kernel/topology.c

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  1 /*
  2  * arch/parisc/kernel/topology.c
  3  *
  4  * Copyright (C) 2017 Helge Deller <deller@gmx.de>
  5  *
  6  * based on arch/arm/kernel/topology.c
  7  *
  8  * This file is subject to the terms and conditions of the GNU General Public
  9  * License.  See the file "COPYING" in the main directory of this archive
 10  * for more details.
 11  */
 12 
 13 #include <linux/percpu.h>
 14 #include <linux/sched.h>
 15 #include <linux/sched/topology.h>
 16 
 17 #include <asm/topology.h>
 18 
 19  /*
 20   * cpu topology table
 21   */
 22 struct cputopo_parisc cpu_topology[NR_CPUS] __read_mostly;
 23 EXPORT_SYMBOL_GPL(cpu_topology);
 24 
 25 const struct cpumask *cpu_coregroup_mask(int cpu)
 26 {
 27         return &cpu_topology[cpu].core_sibling;
 28 }
 29 
 30 static void update_siblings_masks(unsigned int cpuid)
 31 {
 32         struct cputopo_parisc *cpu_topo, *cpuid_topo = &cpu_topology[cpuid];
 33         int cpu;
 34 
 35         /* update core and thread sibling masks */
 36         for_each_possible_cpu(cpu) {
 37                 cpu_topo = &cpu_topology[cpu];
 38 
 39                 if (cpuid_topo->socket_id != cpu_topo->socket_id)
 40                         continue;
 41 
 42                 cpumask_set_cpu(cpuid, &cpu_topo->core_sibling);
 43                 if (cpu != cpuid)
 44                         cpumask_set_cpu(cpu, &cpuid_topo->core_sibling);
 45 
 46                 if (cpuid_topo->core_id != cpu_topo->core_id)
 47                         continue;
 48 
 49                 cpumask_set_cpu(cpuid, &cpu_topo->thread_sibling);
 50                 if (cpu != cpuid)
 51                         cpumask_set_cpu(cpu, &cpuid_topo->thread_sibling);
 52         }
 53         smp_wmb();
 54 }
 55 
 56 static int dualcores_found __initdata;
 57 
 58 /*
 59  * store_cpu_topology is called at boot when only one cpu is running
 60  * and with the mutex cpu_hotplug.lock locked, when several cpus have booted,
 61  * which prevents simultaneous write access to cpu_topology array
 62  */
 63 void __init store_cpu_topology(unsigned int cpuid)
 64 {
 65         struct cputopo_parisc *cpuid_topo = &cpu_topology[cpuid];
 66         struct cpuinfo_parisc *p;
 67         int max_socket = -1;
 68         unsigned long cpu;
 69 
 70         /* If the cpu topology has been already set, just return */
 71         if (cpuid_topo->core_id != -1)
 72                 return;
 73 
 74         /* create cpu topology mapping */
 75         cpuid_topo->thread_id = -1;
 76         cpuid_topo->core_id = 0;
 77 
 78         p = &per_cpu(cpu_data, cpuid);
 79         for_each_online_cpu(cpu) {
 80                 const struct cpuinfo_parisc *cpuinfo = &per_cpu(cpu_data, cpu);
 81 
 82                 if (cpu == cpuid) /* ignore current cpu */
 83                         continue;
 84 
 85                 if (cpuinfo->cpu_loc == p->cpu_loc) {
 86                         cpuid_topo->core_id = cpu_topology[cpu].core_id;
 87                         if (p->cpu_loc) {
 88                                 cpuid_topo->core_id++;
 89                                 cpuid_topo->socket_id = cpu_topology[cpu].socket_id;
 90                                 dualcores_found = 1;
 91                                 continue;
 92                         }
 93                 }
 94 
 95                 if (cpuid_topo->socket_id == -1)
 96                         max_socket = max(max_socket, cpu_topology[cpu].socket_id);
 97         }
 98 
 99         if (cpuid_topo->socket_id == -1)
100                 cpuid_topo->socket_id = max_socket + 1;
101 
102         update_siblings_masks(cpuid);
103 
104         pr_info("CPU%u: thread %d, cpu %d, socket %d\n",
105                 cpuid, cpu_topology[cpuid].thread_id,
106                 cpu_topology[cpuid].core_id,
107                 cpu_topology[cpuid].socket_id);
108 }
109 
110 static struct sched_domain_topology_level parisc_mc_topology[] = {
111 #ifdef CONFIG_SCHED_MC
112         { cpu_coregroup_mask, cpu_core_flags, SD_INIT_NAME(MC) },
113 #endif
114 
115         { cpu_cpu_mask, SD_INIT_NAME(DIE) },
116         { NULL, },
117 };
118 
119 /*
120  * init_cpu_topology is called at boot when only one cpu is running
121  * which prevent simultaneous write access to cpu_topology array
122  */
123 void __init init_cpu_topology(void)
124 {
125         unsigned int cpu;
126 
127         /* init core mask and capacity */
128         for_each_possible_cpu(cpu) {
129                 struct cputopo_parisc *cpu_topo = &(cpu_topology[cpu]);
130 
131                 cpu_topo->thread_id = -1;
132                 cpu_topo->core_id =  -1;
133                 cpu_topo->socket_id = -1;
134                 cpumask_clear(&cpu_topo->core_sibling);
135                 cpumask_clear(&cpu_topo->thread_sibling);
136         }
137         smp_wmb();
138 
139         /* Set scheduler topology descriptor */
140         if (dualcores_found)
141                 set_sched_topology(parisc_mc_topology);
142 }
143 

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