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		   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
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		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
156static 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
164static void *c_next(struct seq_file *m, void *v, loff_t *pos)
165{
166	(*pos)++;
167	return c_start(m, pos);
168}
169
170static void c_stop(struct seq_file *m, void *v)
171{
172}
173
174const 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
182static 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
190void 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