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 }; 166