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 */
201
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