arch/x86/kernel/cpu/proc.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 #include <linux/smp.h>
   3 #include <linux/timex.h>
   4 #include <linux/string.h>
   5 #include <linux/seq_file.h>
   6 #include <linux/cpufreq.h>
   7
   8 #include "cpu.h"
   9
  10 /*
  11  *      Get CPU information for use by the procfs.
  12  */
  13 static void show_cpuinfo_core(struct seq_file *m, struct cpuinfo_x86 *c,
  14                               unsigned int cpu)
  15 {
  16 #ifdef CONFIG_SMP
  17         seq_printf(m, "physical id\t: %d\n", c->phys_proc_id);
  18         seq_printf(m, "siblings\t: %d\n",
  19                    cpumask_weight(topology_core_cpumask(cpu)));
  20         seq_printf(m, "core id\t\t: %d\n", c->cpu_core_id);
  21         seq_printf(m, "cpu cores\t: %d\n", c->booted_cores);
  22         seq_printf(m, "apicid\t\t: %d\n", c->apicid);
  23         seq_printf(m, "initial apicid\t: %d\n", c->initial_apicid);
  24 #endif
  25 }
  26
  27 #ifdef CONFIG_X86_32
  28 static void show_cpuinfo_misc(struct seq_file *m, struct cpuinfo_x86 *c)
  29 {
  30         seq_printf(m,
  31                    "fdiv_bug\t: %s\n"
  32                    "f00f_bug\t: %s\n"
  33                    "coma_bug\t: %s\n"
  34                    "fpu\t\t: %s\n"
  35                    "fpu_exception\t: %s\n"
  36                    "cpuid level\t: %d\n"
  37                    "wp\t\t: yes\n",
  38                    static_cpu_has_bug(X86_BUG_FDIV) ? "yes" : "no",
  39                    static_cpu_has_bug(X86_BUG_F00F) ? "yes" : "no",
  40                    static_cpu_has_bug(X86_BUG_COMA) ? "yes" : "no",
  41                    static_cpu_has(X86_FEATURE_FPU) ? "yes" : "no",
  42                    static_cpu_has(X86_FEATURE_FPU) ? "yes" : "no",
  43                    c->cpuid_level);
  44 }
  45 #else
  46 static void show_cpuinfo_misc(struct seq_file *m, struct cpuinfo_x86 *c)
  47 {
  48         seq_printf(m,
  49                    "fpu\t\t: yes\n"
  50                    "fpu_exception\t: yes\n"
  51                    "cpuid level\t: %d\n"
  52                    "wp\t\t: yes\n",
  53                    c->cpuid_level);
  54 }
  55 #endif
  56
  57 static int show_cpuinfo(struct seq_file *m, void *v)
  58 {
  59         struct cpuinfo_x86 *c = v;
  60         unsigned int cpu;
  61         int i;
  62
  63         cpu = c->cpu_index;
  64         seq_printf(m, "processor\t: %u\n"
  65                    "vendor_id\t: %s\n"
  66                    "cpu family\t: %d\n"
  67                    "model\t\t: %u\n"
  68                    "model name\t: %s\n",
  69                    cpu,
  70                    c->x86_vendor_id[0] ? c->x86_vendor_id : "unknown",
  71                    c->x86,
  72                    c->x86_model,
  73                    c->x86_model_id[0] ? c->x86_model_id : "unknown");
  74
  75         if (c->x86_stepping || c->cpuid_level >= 0)
  76                 seq_printf(m, "stepping\t: %d\n", c->x86_stepping);
  77         else
  78                 seq_puts(m, "stepping\t: unknown\n");
  79         if (c->microcode)
  80                 seq_printf(m, "microcode\t: 0x%x\n", c->microcode);
  81
  82         if (cpu_has(c, X86_FEATURE_TSC)) {
  83                 unsigned int freq = aperfmperf_get_khz(cpu);
  84
  85                 if (!freq)
  86                         freq = cpufreq_quick_get(cpu);
  87                 if (!freq)
  88                         freq = cpu_khz;
  89                 seq_printf(m, "cpu MHz\t\t: %u.%03u\n",
  90                            freq / 1000, (freq % 1000));
  91         }
  92
  93         /* Cache size */
  94         if (c->x86_cache_size >= 0)
  95                 seq_printf(m, "cache size\t: %d KB\n", c->x86_cache_size);
  96
  97         show_cpuinfo_core(m, c, cpu);
  98         show_cpuinfo_misc(m, c);
  99
 100         seq_puts(m, "flags\t\t:");
 101         for (i = 0; i < 32*NCAPINTS; i++)
 102                 if (cpu_has(c, i) && x86_cap_flags[i] != NULL)
 103                         seq_printf(m, " %s", x86_cap_flags[i]);
 104
 105         seq_puts(m, "\nbugs\t\t:");
 106         for (i = 0; i < 32*NBUGINTS; i++) {
 107                 unsigned int bug_bit = 32*NCAPINTS + i;
 108
 109                 if (cpu_has_bug(c, bug_bit) && x86_bug_flags[i])
 110                         seq_printf(m, " %s", x86_bug_flags[i]);
 111         }
 112
 113         seq_printf(m, "\nbogomips\t: %lu.%02lu\n",
 114                    c->loops_per_jiffy/(500000/HZ),
 115                    (c->loops_per_jiffy/(5000/HZ)) % 100);
 116
 117 #ifdef CONFIG_X86_64
 118         if (c->x86_tlbsize > 0)
 119                 seq_printf(m, "TLB size\t: %d 4K pages\n", c->x86_tlbsize);
 120 #endif
 121         seq_printf(m, "clflush size\t: %u\n", c->x86_clflush_size);
 122         seq_printf(m, "cache_alignment\t: %d\n", c->x86_cache_alignment);
 123         seq_printf(m, "address sizes\t: %u bits physical, %u bits virtual\n",
 124                    c->x86_phys_bits, c->x86_virt_bits);
 125
 126         seq_puts(m, "power management:");
 127         for (i = 0; i < 32; i++) {
 128                 if (c->x86_power & (1 << i)) {
 129                         if (i < ARRAY_SIZE(x86_power_flags) &&
 130                             x86_power_flags[i])
 131                                 seq_printf(m, "%s%s",
 132                                            x86_power_flags[i][0] ? " " : "",
 133                                            x86_power_flags[i]);
 134                         else
 135                                 seq_printf(m, " [%d]", i);
 136                 }
 137         }
 138
 139         seq_puts(m, "\n\n");
 140
 141         return 0;
 142 }
 143
 144 static void *c_start(struct seq_file *m, loff_t *pos)
 145 {
 146         *pos = cpumask_next(*pos - 1, cpu_online_mask);
 147         if ((*pos) < nr_cpu_ids)
 148                 return &cpu_data(*pos);
 149         return NULL;
 150 }
 151
 152 static void *c_next(struct seq_file *m, void *v, loff_t *pos)
 153 {
 154         (*pos)++;
 155         return c_start(m, pos);
 156 }
 157
 158 static void c_stop(struct seq_file *m, void *v)
 159 {
 160 }
 161
 162 const struct seq_operations cpuinfo_op = {
 163         .start  = c_start,
 164         .next   = c_next,
 165         .stop   = c_stop,
 166         .show   = show_cpuinfo,
 167 };