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 #include <asm/prctl.h>
   8 #include <linux/proc_fs.h>
   9
  10 #include "cpu.h"
  11
  12 #ifdef CONFIG_X86_VMX_FEATURE_NAMES
  13 extern const char * const x86_vmx_flags[NVMXINTS*32];
  14 #endif
  15
  16 /*
  17  *      Get CPU information for use by the procfs.
  18  */
  19 static void show_cpuinfo_core(struct seq_file *m, struct cpuinfo_x86 *c,
  20                               unsigned int cpu)
  21 {
  22 #ifdef CONFIG_SMP
  23         seq_printf(m, "physical id\t: %d\n", c->topo.pkg_id);
  24         seq_printf(m, "siblings\t: %d\n",
  25                    cpumask_weight(topology_core_cpumask(cpu)));
  26         seq_printf(m, "core id\t\t: %d\n", c->topo.core_id);
  27         seq_printf(m, "cpu cores\t: %d\n", c->booted_cores);
  28         seq_printf(m, "apicid\t\t: %d\n", c->topo.apicid);
  29         seq_printf(m, "initial apicid\t: %d\n", c->topo.initial_apicid);
  30 #endif
  31 }
  32
  33 #ifdef CONFIG_X86_32
  34 static void show_cpuinfo_misc(struct seq_file *m, struct cpuinfo_x86 *c)
  35 {
  36         seq_printf(m,
  37                    "fdiv_bug\t: %s\n"
  38                    "f00f_bug\t: %s\n"
  39                    "coma_bug\t: %s\n"
  40                    "fpu\t\t: %s\n"
  41                    "fpu_exception\t: %s\n"
  42                    "cpuid level\t: %d\n"
  43                    "wp\t\t: yes\n",
  44                    boot_cpu_has_bug(X86_BUG_FDIV) ? "yes" : "no",
  45                    boot_cpu_has_bug(X86_BUG_F00F) ? "yes" : "no",
  46                    boot_cpu_has_bug(X86_BUG_COMA) ? "yes" : "no",
  47                    boot_cpu_has(X86_FEATURE_FPU) ? "yes" : "no",
  48                    boot_cpu_has(X86_FEATURE_FPU) ? "yes" : "no",
  49                    c->cpuid_level);
  50 }
  51 #else
  52 static void show_cpuinfo_misc(struct seq_file *m, struct cpuinfo_x86 *c)
  53 {
  54         seq_printf(m,
  55                    "fpu\t\t: yes\n"
  56                    "fpu_exception\t: yes\n"
  57                    "cpuid level\t: %d\n"
  58                    "wp\t\t: yes\n",
  59                    c->cpuid_level);
  60 }
  61 #endif
  62
  63 static int show_cpuinfo(struct seq_file *m, void *v)
  64 {
  65         struct cpuinfo_x86 *c = v;
  66         unsigned int cpu;
  67         int i;
  68
  69         cpu = c->cpu_index;
  70         seq_printf(m, "processor\t: %u\n"
  71                    "vendor_id\t: %s\n"
  72                    "cpu family\t: %d\n"
  73                    "model\t\t: %u\n"
  74                    "model name\t: %s\n",
  75                    cpu,
  76                    c->x86_vendor_id[0] ? c->x86_vendor_id : "unknown",
  77                    c->x86,
  78                    c->x86_model,
  79                    c->x86_model_id[0] ? c->x86_model_id : "unknown");
  80
  81         if (c->x86_stepping || c->cpuid_level >= 0)
  82                 seq_printf(m, "stepping\t: %d\n", c->x86_stepping);
  83         else
  84                 seq_puts(m, "stepping\t: unknown\n");
  85         if (c->microcode)
  86                 seq_printf(m, "microcode\t: 0x%x\n", c->microcode);
  87
  88         if (cpu_has(c, X86_FEATURE_TSC)) {
  89                 unsigned int freq = arch_freq_get_on_cpu(cpu);
  90
  91                 seq_printf(m, "cpu MHz\t\t: %u.%03u\n", freq / 1000, (freq % 1000));
  92         }
  93
  94         /* Cache size */
  95         if (c->x86_cache_size)
  96                 seq_printf(m, "cache size\t: %u KB\n", c->x86_cache_size);
  97
  98         show_cpuinfo_core(m, c, cpu);
  99         show_cpuinfo_misc(m, c);
 100
 101         seq_puts(m, "flags\t\t:");
 102         for (i = 0; i < 32*NCAPINTS; i++)
 103                 if (cpu_has(c, i) && x86_cap_flags[i] != NULL)
 104                         seq_printf(m, " %s", x86_cap_flags[i]);
 105
 106 #ifdef CONFIG_X86_VMX_FEATURE_NAMES
 107         if (cpu_has(c, X86_FEATURE_VMX) && c->vmx_capability[0]) {
 108                 seq_puts(m, "\nvmx flags\t:");
 109                 for (i = 0; i < 32*NVMXINTS; i++) {
 110                         if (test_bit(i, (unsigned long *)c->vmx_capability) &&
 111                             x86_vmx_flags[i] != NULL)
 112                                 seq_printf(m, " %s", x86_vmx_flags[i]);
 113                 }
 114         }
 115 #endif
 116
 117         seq_puts(m, "\nbugs\t\t:");
 118         for (i = 0; i < 32*NBUGINTS; i++) {
 119                 unsigned int bug_bit = 32*NCAPINTS + i;
 120
 121                 if (cpu_has_bug(c, bug_bit) && x86_bug_flags[i])
 122                         seq_printf(m, " %s", x86_bug_flags[i]);
 123         }
 124
 125         seq_printf(m, "\nbogomips\t: %lu.%02lu\n",
 126                    c->loops_per_jiffy/(500000/HZ),
 127                    (c->loops_per_jiffy/(5000/HZ)) % 100);
 128
 129 #ifdef CONFIG_X86_64
 130         if (c->x86_tlbsize > 0)
 131                 seq_printf(m, "TLB size\t: %d 4K pages\n", c->x86_tlbsize);
 132 #endif
 133         seq_printf(m, "clflush size\t: %u\n", c->x86_clflush_size);
 134         seq_printf(m, "cache_alignment\t: %d\n", c->x86_cache_alignment);
 135         seq_printf(m, "address sizes\t: %u bits physical, %u bits virtual\n",
 136                    c->x86_phys_bits, c->x86_virt_bits);
 137
 138         seq_puts(m, "power management:");
 139         for (i = 0; i < 32; i++) {
 140                 if (c->x86_power & (1 << i)) {
 141                         if (i < ARRAY_SIZE(x86_power_flags) &&
 142                             x86_power_flags[i])
 143                                 seq_printf(m, "%s%s",
 144                                            x86_power_flags[i][0] ? " " : "",
 145                                            x86_power_flags[i]);
 146                         else
 147                                 seq_printf(m, " [%d]", i);
 148                 }
 149         }
 150
 151         seq_puts(m, "\n\n");
 152
 153         return 0;
 154 }
 155
 156 static void *c_start(struct seq_file *m, loff_t *pos)
 157 {
 158         *pos = cpumask_next(*pos - 1, cpu_online_mask);
 159         if ((*pos) < nr_cpu_ids)
 160                 return &cpu_data(*pos);
 161         return NULL;
 162 }
 163
 164 static void *c_next(struct seq_file *m, void *v, loff_t *pos)
 165 {
 166         (*pos)++;
 167         return c_start(m, pos);
 168 }
 169
 170 static void c_stop(struct seq_file *m, void *v)
 171 {
 172 }
 173
 174 const struct seq_operations cpuinfo_op = {
 175         .start  = c_start,
 176         .next   = c_next,
 177         .stop   = c_stop,
 178         .show   = show_cpuinfo,
 179 };
 180
 181 #ifdef CONFIG_X86_USER_SHADOW_STACK
 182 static void dump_x86_features(struct seq_file *m, unsigned long features)
 183 {
 184         if (features & ARCH_SHSTK_SHSTK)
 185                 seq_puts(m, "shstk ");
 186         if (features & ARCH_SHSTK_WRSS)
 187                 seq_puts(m, "wrss ");
 188 }
 189
 190 void arch_proc_pid_thread_features(struct seq_file *m, struct task_struct *task)
 191 {
 192         seq_puts(m, "x86_Thread_features:\t");
 193         dump_x86_features(m, task->thread.features);
 194         seq_putc(m, '\n');
 195
 196         seq_puts(m, "x86_Thread_features_locked:\t");
 197         dump_x86_features(m, task->thread.features_locked);
 198         seq_putc(m, '\n');
 199 }
 200 #endif /* CONFIG_X86_USER_SHADOW_STACK */