x86: CPU: Fix up "cpu MHz" in /proc/cpuinfo
[sfrench/cifs-2.6.git] / arch / x86 / kernel / cpu / proc.c
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 };