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 /*
   9  *      Get CPU information for use by the procfs.
  10  */
  11 static void show_cpuinfo_core(struct seq_file *m, struct cpuinfo_x86 *c,
  12                               unsigned int cpu)
  13 {
  14 #ifdef CONFIG_SMP
  15         seq_printf(m, "physical id\t: %d\n", c->phys_proc_id);
  16         seq_printf(m, "siblings\t: %d\n",
  17                    cpumask_weight(topology_core_cpumask(cpu)));
  18         seq_printf(m, "core id\t\t: %d\n", c->cpu_core_id);
  19         seq_printf(m, "cpu cores\t: %d\n", c->booted_cores);
  20         seq_printf(m, "apicid\t\t: %d\n", c->apicid);
  21         seq_printf(m, "initial apicid\t: %d\n", c->initial_apicid);
  22 #endif
  23 }
  24
  25 #ifdef CONFIG_X86_32
  26 static void show_cpuinfo_misc(struct seq_file *m, struct cpuinfo_x86 *c)
  27 {
  28         seq_printf(m,
  29                    "fdiv_bug\t: %s\n"
  30                    "f00f_bug\t: %s\n"
  31                    "coma_bug\t: %s\n"
  32                    "fpu\t\t: %s\n"
  33                    "fpu_exception\t: %s\n"
  34                    "cpuid level\t: %d\n"
  35                    "wp\t\t: yes\n",
  36                    static_cpu_has_bug(X86_BUG_FDIV) ? "yes" : "no",
  37                    static_cpu_has_bug(X86_BUG_F00F) ? "yes" : "no",
  38                    static_cpu_has_bug(X86_BUG_COMA) ? "yes" : "no",
  39                    static_cpu_has(X86_FEATURE_FPU) ? "yes" : "no",
  40                    static_cpu_has(X86_FEATURE_FPU) ? "yes" : "no",
  41                    c->cpuid_level);
  42 }
  43 #else
  44 static void show_cpuinfo_misc(struct seq_file *m, struct cpuinfo_x86 *c)
  45 {
  46         seq_printf(m,
  47                    "fpu\t\t: yes\n"
  48                    "fpu_exception\t: yes\n"
  49                    "cpuid level\t: %d\n"
  50                    "wp\t\t: yes\n",
  51                    c->cpuid_level);
  52 }
  53 #endif
  54
  55 static int show_cpuinfo(struct seq_file *m, void *v)
  56 {
  57         struct cpuinfo_x86 *c = v;
  58         unsigned int cpu;
  59         int i;
  60
  61         cpu = c->cpu_index;
  62         seq_printf(m, "processor\t: %u\n"
  63                    "vendor_id\t: %s\n"
  64                    "cpu family\t: %d\n"
  65                    "model\t\t: %u\n"
  66                    "model name\t: %s\n",
  67                    cpu,
  68                    c->x86_vendor_id[0] ? c->x86_vendor_id : "unknown",
  69                    c->x86,
  70                    c->x86_model,
  71                    c->x86_model_id[0] ? c->x86_model_id : "unknown");
  72
  73         if (c->x86_mask || c->cpuid_level >= 0)
  74                 seq_printf(m, "stepping\t: %d\n", c->x86_mask);
  75         else
  76                 seq_puts(m, "stepping\t: unknown\n");
  77         if (c->microcode)
  78                 seq_printf(m, "microcode\t: 0x%x\n", c->microcode);
  79
  80         if (cpu_has(c, X86_FEATURE_TSC)) {
  81                 unsigned int freq = arch_freq_get_on_cpu(cpu);
  82
  83                 if (!freq)
  84                         freq = cpufreq_quick_get(cpu);
  85                 if (!freq)
  86                         freq = cpu_khz;
  87                 seq_printf(m, "cpu MHz\t\t: %u.%03u\n",
  88                            freq / 1000, (freq % 1000));
  89         }
  90
  91         /* Cache size */
  92         if (c->x86_cache_size >= 0)
  93                 seq_printf(m, "cache size\t: %d KB\n", c->x86_cache_size);
  94
  95         show_cpuinfo_core(m, c, cpu);
  96         show_cpuinfo_misc(m, c);
  97
  98         seq_puts(m, "flags\t\t:");
  99         for (i = 0; i < 32*NCAPINTS; i++)
 100                 if (cpu_has(c, i) && x86_cap_flags[i] != NULL)
 101                         seq_printf(m, " %s", x86_cap_flags[i]);
 102
 103         seq_puts(m, "\nbugs\t\t:");
 104         for (i = 0; i < 32*NBUGINTS; i++) {
 105                 unsigned int bug_bit = 32*NCAPINTS + i;
 106
 107                 if (cpu_has_bug(c, bug_bit) && x86_bug_flags[i])
 108                         seq_printf(m, " %s", x86_bug_flags[i]);
 109         }
 110
 111         seq_printf(m, "\nbogomips\t: %lu.%02lu\n",
 112                    c->loops_per_jiffy/(500000/HZ),
 113                    (c->loops_per_jiffy/(5000/HZ)) % 100);
 114
 115 #ifdef CONFIG_X86_64
 116         if (c->x86_tlbsize > 0)
 117                 seq_printf(m, "TLB size\t: %d 4K pages\n", c->x86_tlbsize);
 118 #endif
 119         seq_printf(m, "clflush size\t: %u\n", c->x86_clflush_size);
 120         seq_printf(m, "cache_alignment\t: %d\n", c->x86_cache_alignment);
 121         seq_printf(m, "address sizes\t: %u bits physical, %u bits virtual\n",
 122                    c->x86_phys_bits, c->x86_virt_bits);
 123
 124         seq_puts(m, "power management:");
 125         for (i = 0; i < 32; i++) {
 126                 if (c->x86_power & (1 << i)) {
 127                         if (i < ARRAY_SIZE(x86_power_flags) &&
 128                             x86_power_flags[i])
 129                                 seq_printf(m, "%s%s",
 130                                            x86_power_flags[i][0] ? " " : "",
 131                                            x86_power_flags[i]);
 132                         else
 133                                 seq_printf(m, " [%d]", i);
 134                 }
 135         }
 136
 137         seq_puts(m, "\n\n");
 138
 139         return 0;
 140 }
 141
 142 static void *c_start(struct seq_file *m, loff_t *pos)
 143 {
 144         *pos = cpumask_next(*pos - 1, cpu_online_mask);
 145         if ((*pos) < nr_cpu_ids)
 146                 return &cpu_data(*pos);
 147         return NULL;
 148 }
 149
 150 static void *c_next(struct seq_file *m, void *v, loff_t *pos)
 151 {
 152         (*pos)++;
 153         return c_start(m, pos);
 154 }
 155
 156 static void c_stop(struct seq_file *m, void *v)
 157 {
 158 }
 159
 160 const struct seq_operations cpuinfo_op = {
 161         .start  = c_start,
 162         .next   = c_next,
 163         .stop   = c_stop,
 164         .show   = show_cpuinfo,
 165 };