xref: /openbmc/linux/arch/x86/kernel/cpu/proc.c (revision 0ee44885)
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  */
show_cpuinfo_core(struct seq_file * m,struct cpuinfo_x86 * c,unsigned int cpu)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->phys_proc_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->cpu_core_id);
27 	seq_printf(m, "cpu cores\t: %d\n", c->booted_cores);
28 	seq_printf(m, "apicid\t\t: %d\n", c->apicid);
29 	seq_printf(m, "initial apicid\t: %d\n", c->initial_apicid);
30 #endif
31 }
32 
33 #ifdef CONFIG_X86_32
show_cpuinfo_misc(struct seq_file * m,struct cpuinfo_x86 * c)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
show_cpuinfo_misc(struct seq_file * m,struct cpuinfo_x86 * c)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 
show_cpuinfo(struct seq_file * m,void * v)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 
c_start(struct seq_file * m,loff_t * pos)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 
c_next(struct seq_file * m,void * v,loff_t * pos)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 
c_stop(struct seq_file * m,void * v)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
dump_x86_features(struct seq_file * m,unsigned long features)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 
arch_proc_pid_thread_features(struct seq_file * m,struct task_struct * task)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