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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
13extern const char * const x86_vmx_flags[NVMXINTS*32];
14#endif
15
16/*
17 * Get CPU information for use by the procfs.
18 */
19static 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
34static 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
52static 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
63static 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
159static 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
167static void *c_next(struct seq_file *m, void *v, loff_t *pos)
168{
169 (*pos)++;
170 return c_start(m, pos);
171}
172
173static void c_stop(struct seq_file *m, void *v)
174{
175}
176
177const 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
185static 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
193void 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 */