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 str_yes_no(boot_cpu_has_bug(X86_BUG_FDIV)), 45 str_yes_no(boot_cpu_has_bug(X86_BUG_F00F)), 46 str_yes_no(boot_cpu_has_bug(X86_BUG_COMA)), 47 str_yes_no(boot_cpu_has(X86_FEATURE_FPU)), 48 str_yes_no(boot_cpu_has(X86_FEATURE_FPU)), 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 int freq = arch_freq_get_on_cpu(cpu); 90 91 if (freq < 0) 92 seq_puts(m, "cpu MHz\t\t: Unknown\n"); 93 else 94 seq_printf(m, "cpu MHz\t\t: %u.%03u\n", 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 }; 183 184 #ifdef CONFIG_X86_USER_SHADOW_STACK 185 static void dump_x86_features(struct seq_file *m, unsigned long features) 186 { 187 if (features & ARCH_SHSTK_SHSTK) 188 seq_puts(m, "shstk "); 189 if (features & ARCH_SHSTK_WRSS) 190 seq_puts(m, "wrss "); 191 } 192 193 void arch_proc_pid_thread_features(struct seq_file *m, struct task_struct *task) 194 { 195 seq_puts(m, "x86_Thread_features:\t"); 196 dump_x86_features(m, task->thread.features); 197 seq_putc(m, '\n'); 198 199 seq_puts(m, "x86_Thread_features_locked:\t"); 200 dump_x86_features(m, task->thread.features_locked); 201 seq_putc(m, '\n'); 202 } 203 #endif /* CONFIG_X86_USER_SHADOW_STACK */ 204