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 #ifdef CONFIG_X86_VMX_FEATURE_NAMES
  11 extern const char * const x86_vmx_flags[NVMXINTS*32];
  12 #endif
  13
  14 /*
  15  *      Get CPU information for use by the procfs.
  16  */
  17 static void show_cpuinfo_core(struct seq_file *m, struct cpuinfo_x86 *c,
  18                               unsigned int cpu)
  19 {
  20 #ifdef CONFIG_SMP
  21         seq_printf(m, "physical id\t: %d\n", c->phys_proc_id);
  22         seq_printf(m, "siblings\t: %d\n",
  23                    cpumask_weight(topology_core_cpumask(cpu)));
  24         seq_printf(m, "core id\t\t: %d\n", c->cpu_core_id);
  25         seq_printf(m, "cpu cores\t: %d\n", c->booted_cores);
  26         seq_printf(m, "apicid\t\t: %d\n", c->apicid);
  27         seq_printf(m, "initial apicid\t: %d\n", c->initial_apicid);
  28 #endif
  29 }
  30
  31 #ifdef CONFIG_X86_32
  32 static void show_cpuinfo_misc(struct seq_file *m, struct cpuinfo_x86 *c)
  33 {
  34         seq_printf(m,
  35                    "fdiv_bug\t: %s\n"
  36                    "f00f_bug\t: %s\n"
  37                    "coma_bug\t: %s\n"
  38                    "fpu\t\t: %s\n"
  39                    "fpu_exception\t: %s\n"
  40                    "cpuid level\t: %d\n"
  41                    "wp\t\t: yes\n",
  42                    boot_cpu_has_bug(X86_BUG_FDIV) ? "yes" : "no",
  43                    boot_cpu_has_bug(X86_BUG_F00F) ? "yes" : "no",
  44                    boot_cpu_has_bug(X86_BUG_COMA) ? "yes" : "no",
  45                    boot_cpu_has(X86_FEATURE_FPU) ? "yes" : "no",
  46                    boot_cpu_has(X86_FEATURE_FPU) ? "yes" : "no",
  47                    c->cpuid_level);
  48 }
  49 #else
  50 static void show_cpuinfo_misc(struct seq_file *m, struct cpuinfo_x86 *c)
  51 {
  52         seq_printf(m,
  53                    "fpu\t\t: yes\n"
  54                    "fpu_exception\t: yes\n"
  55                    "cpuid level\t: %d\n"
  56                    "wp\t\t: yes\n",
  57                    c->cpuid_level);
  58 }
  59 #endif
  60
  61 static int show_cpuinfo(struct seq_file *m, void *v)
  62 {
  63         struct cpuinfo_x86 *c = v;
  64         unsigned int cpu;
  65         int i;
  66
  67         cpu = c->cpu_index;
  68         seq_printf(m, "processor\t: %u\n"
  69                    "vendor_id\t: %s\n"
  70                    "cpu family\t: %d\n"
  71                    "model\t\t: %u\n"
  72                    "model name\t: %s\n",
  73                    cpu,
  74                    c->x86_vendor_id[0] ? c->x86_vendor_id : "unknown",
  75                    c->x86,
  76                    c->x86_model,
  77                    c->x86_model_id[0] ? c->x86_model_id : "unknown");
  78
  79         if (c->x86_stepping || c->cpuid_level >= 0)
  80                 seq_printf(m, "stepping\t: %d\n", c->x86_stepping);
  81         else
  82                 seq_puts(m, "stepping\t: unknown\n");
  83         if (c->microcode)
  84                 seq_printf(m, "microcode\t: 0x%x\n", c->microcode);
  85
  86         if (cpu_has(c, X86_FEATURE_TSC)) {
  87                 unsigned int freq = aperfmperf_get_khz(cpu);
  88
  89                 if (!freq)
  90                         freq = cpufreq_quick_get(cpu);
  91                 if (!freq)
  92                         freq = cpu_khz;
  93                 seq_printf(m, "cpu MHz\t\t: %u.%03u\n",
  94                            freq / 1000, (freq % 1000));
  95         }
  96
  97         /* Cache size */
  98         if (c->x86_cache_size)
  99                 seq_printf(m, "cache size\t: %u KB\n", c->x86_cache_size);
 100
 101         show_cpuinfo_core(m, c, cpu);
 102         show_cpuinfo_misc(m, c);
 103
 104         seq_puts(m, "flags\t\t:");
 105         for (i = 0; i < 32*NCAPINTS; i++)
 106                 if (cpu_has(c, i) && x86_cap_flags[i] != NULL)
 107                         seq_printf(m, " %s", x86_cap_flags[i]);
 108
 109 #ifdef CONFIG_X86_VMX_FEATURE_NAMES
 110         if (cpu_has(c, X86_FEATURE_VMX) && c->vmx_capability[0]) {
 111                 seq_puts(m, "\nvmx flags\t:");
 112                 for (i = 0; i < 32*NVMXINTS; i++) {
 113                         if (test_bit(i, (unsigned long *)c->vmx_capability) &&
 114                             x86_vmx_flags[i] != NULL)
 115                                 seq_printf(m, " %s", x86_vmx_flags[i]);
 116                 }
 117         }
 118 #endif
 119
 120         seq_puts(m, "\nbugs\t\t:");
 121         for (i = 0; i < 32*NBUGINTS; i++) {
 122                 unsigned int bug_bit = 32*NCAPINTS + i;
 123
 124                 if (cpu_has_bug(c, bug_bit) && x86_bug_flags[i])
 125                         seq_printf(m, " %s", x86_bug_flags[i]);
 126         }
 127
 128         seq_printf(m, "\nbogomips\t: %lu.%02lu\n",
 129                    c->loops_per_jiffy/(500000/HZ),
 130                    (c->loops_per_jiffy/(5000/HZ)) % 100);
 131
 132 #ifdef CONFIG_X86_64
 133         if (c->x86_tlbsize > 0)
 134                 seq_printf(m, "TLB size\t: %d 4K pages\n", c->x86_tlbsize);
 135 #endif
 136         seq_printf(m, "clflush size\t: %u\n", c->x86_clflush_size);
 137         seq_printf(m, "cache_alignment\t: %d\n", c->x86_cache_alignment);
 138         seq_printf(m, "address sizes\t: %u bits physical, %u bits virtual\n",
 139                    c->x86_phys_bits, c->x86_virt_bits);
 140
 141         seq_puts(m, "power management:");
 142         for (i = 0; i < 32; i++) {
 143                 if (c->x86_power & (1 << i)) {
 144                         if (i < ARRAY_SIZE(x86_power_flags) &&
 145                             x86_power_flags[i])
 146                                 seq_printf(m, "%s%s",
 147                                            x86_power_flags[i][0] ? " " : "",
 148                                            x86_power_flags[i]);
 149                         else
 150                                 seq_printf(m, " [%d]", i);
 151                 }
 152         }
 153
 154         seq_puts(m, "\n\n");
 155
 156         return 0;
 157 }
 158
 159 static void *c_start(struct seq_file *m, loff_t *pos)
 160 {
 161         *pos = cpumask_next(*pos - 1, cpu_online_mask);
 162         if ((*pos) < nr_cpu_ids)
 163                 return &cpu_data(*pos);
 164         return NULL;
 165 }
 166
 167 static void *c_next(struct seq_file *m, void *v, loff_t *pos)
 168 {
 169         (*pos)++;
 170         return c_start(m, pos);
 171 }
 172
 173 static void c_stop(struct seq_file *m, void *v)
 174 {
 175 }
 176
 177 const struct seq_operations cpuinfo_op = {
 178         .start  = c_start,
 179         .next   = c_next,
 180         .stop   = c_stop,
 181         .show   = show_cpuinfo,
 182 };