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 7 /* 8 * Get CPU information for use by the procfs. 9 */ 10 static void show_cpuinfo_core(struct seq_file *m, struct cpuinfo_x86 *c, 11 unsigned int cpu) 12 { 13 #ifdef CONFIG_SMP 14 seq_printf(m, "physical id\t: %d\n", c->phys_proc_id); 15 seq_printf(m, "siblings\t: %d\n", 16 cpumask_weight(topology_core_cpumask(cpu))); 17 seq_printf(m, "core id\t\t: %d\n", c->cpu_core_id); 18 seq_printf(m, "cpu cores\t: %d\n", c->booted_cores); 19 seq_printf(m, "apicid\t\t: %d\n", c->apicid); 20 seq_printf(m, "initial apicid\t: %d\n", c->initial_apicid); 21 #endif 22 } 23 24 #ifdef CONFIG_X86_32 25 static void show_cpuinfo_misc(struct seq_file *m, struct cpuinfo_x86 *c) 26 { 27 seq_printf(m, 28 "fdiv_bug\t: %s\n" 29 "f00f_bug\t: %s\n" 30 "coma_bug\t: %s\n" 31 "fpu\t\t: %s\n" 32 "fpu_exception\t: %s\n" 33 "cpuid level\t: %d\n" 34 "wp\t\t: yes\n", 35 static_cpu_has_bug(X86_BUG_FDIV) ? "yes" : "no", 36 static_cpu_has_bug(X86_BUG_F00F) ? "yes" : "no", 37 static_cpu_has_bug(X86_BUG_COMA) ? "yes" : "no", 38 static_cpu_has(X86_FEATURE_FPU) ? "yes" : "no", 39 static_cpu_has(X86_FEATURE_FPU) ? "yes" : "no", 40 c->cpuid_level); 41 } 42 #else 43 static void show_cpuinfo_misc(struct seq_file *m, struct cpuinfo_x86 *c) 44 { 45 seq_printf(m, 46 "fpu\t\t: yes\n" 47 "fpu_exception\t: yes\n" 48 "cpuid level\t: %d\n" 49 "wp\t\t: yes\n", 50 c->cpuid_level); 51 } 52 #endif 53 54 static int show_cpuinfo(struct seq_file *m, void *v) 55 { 56 struct cpuinfo_x86 *c = v; 57 unsigned int cpu; 58 int i; 59 60 cpu = c->cpu_index; 61 seq_printf(m, "processor\t: %u\n" 62 "vendor_id\t: %s\n" 63 "cpu family\t: %d\n" 64 "model\t\t: %u\n" 65 "model name\t: %s\n", 66 cpu, 67 c->x86_vendor_id[0] ? c->x86_vendor_id : "unknown", 68 c->x86, 69 c->x86_model, 70 c->x86_model_id[0] ? c->x86_model_id : "unknown"); 71 72 if (c->x86_mask || c->cpuid_level >= 0) 73 seq_printf(m, "stepping\t: %d\n", c->x86_mask); 74 else 75 seq_puts(m, "stepping\t: unknown\n"); 76 if (c->microcode) 77 seq_printf(m, "microcode\t: 0x%x\n", c->microcode); 78 79 if (cpu_has(c, X86_FEATURE_TSC)) 80 seq_printf(m, "cpu MHz\t\t: %u.%03u\n", 81 cpu_khz / 1000, (cpu_khz % 1000)); 82 83 /* Cache size */ 84 if (c->x86_cache_size >= 0) 85 seq_printf(m, "cache size\t: %d KB\n", c->x86_cache_size); 86 87 show_cpuinfo_core(m, c, cpu); 88 show_cpuinfo_misc(m, c); 89 90 seq_puts(m, "flags\t\t:"); 91 for (i = 0; i < 32*NCAPINTS; i++) 92 if (cpu_has(c, i) && x86_cap_flags[i] != NULL) 93 seq_printf(m, " %s", x86_cap_flags[i]); 94 95 seq_puts(m, "\nbugs\t\t:"); 96 for (i = 0; i < 32*NBUGINTS; i++) { 97 unsigned int bug_bit = 32*NCAPINTS + i; 98 99 if (cpu_has_bug(c, bug_bit) && x86_bug_flags[i]) 100 seq_printf(m, " %s", x86_bug_flags[i]); 101 } 102 103 seq_printf(m, "\nbogomips\t: %lu.%02lu\n", 104 c->loops_per_jiffy/(500000/HZ), 105 (c->loops_per_jiffy/(5000/HZ)) % 100); 106 107 #ifdef CONFIG_X86_64 108 if (c->x86_tlbsize > 0) 109 seq_printf(m, "TLB size\t: %d 4K pages\n", c->x86_tlbsize); 110 #endif 111 seq_printf(m, "clflush size\t: %u\n", c->x86_clflush_size); 112 seq_printf(m, "cache_alignment\t: %d\n", c->x86_cache_alignment); 113 seq_printf(m, "address sizes\t: %u bits physical, %u bits virtual\n", 114 c->x86_phys_bits, c->x86_virt_bits); 115 116 seq_puts(m, "power management:"); 117 for (i = 0; i < 32; i++) { 118 if (c->x86_power & (1 << i)) { 119 if (i < ARRAY_SIZE(x86_power_flags) && 120 x86_power_flags[i]) 121 seq_printf(m, "%s%s", 122 x86_power_flags[i][0] ? " " : "", 123 x86_power_flags[i]); 124 else 125 seq_printf(m, " [%d]", i); 126 } 127 } 128 129 seq_puts(m, "\n\n"); 130 131 return 0; 132 } 133 134 static void *c_start(struct seq_file *m, loff_t *pos) 135 { 136 *pos = cpumask_next(*pos - 1, cpu_online_mask); 137 if ((*pos) < nr_cpu_ids) 138 return &cpu_data(*pos); 139 return NULL; 140 } 141 142 static void *c_next(struct seq_file *m, void *v, loff_t *pos) 143 { 144 (*pos)++; 145 return c_start(m, pos); 146 } 147 148 static void c_stop(struct seq_file *m, void *v) 149 { 150 } 151 152 const struct seq_operations cpuinfo_op = { 153 .start = c_start, 154 .next = c_next, 155 .stop = c_stop, 156 .show = show_cpuinfo, 157 }; 158