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->phys_proc_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->cpu_core_id); 27 seq_printf(m, "cpu cores\t: %d\n", c->booted_cores); 28 seq_printf(m, "apicid\t\t: %d\n", c->apicid); 29 seq_printf(m, "initial apicid\t: %d\n", c->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 */ 201