1/*
2 *  Copyright IBM Corp. 2008
3 *  Author(s): Martin Schwidefsky (schwidefsky@de.ibm.com)
4 */
5
6#define KMSG_COMPONENT "cpu"
7#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
8
9#include <linux/kernel.h>
10#include <linux/init.h>
11#include <linux/seq_file.h>
12#include <linux/delay.h>
13#include <linux/cpu.h>
14#include <asm/elf.h>
15#include <asm/lowcore.h>
16#include <asm/param.h>
17#include <asm/smp.h>
18
19static DEFINE_PER_CPU(struct cpuid, cpu_id);
20
21void notrace cpu_relax(void)
22{
23	if (!smp_cpu_mtid && MACHINE_HAS_DIAG44)
24		asm volatile("diag 0,0,0x44");
25	barrier();
26}
27EXPORT_SYMBOL(cpu_relax);
28
29/*
30 * cpu_init - initializes state that is per-CPU.
31 */
32void cpu_init(void)
33{
34	struct cpuid *id = this_cpu_ptr(&cpu_id);
35
36	get_cpu_id(id);
37	atomic_inc(&init_mm.mm_count);
38	current->active_mm = &init_mm;
39	BUG_ON(current->mm);
40	enter_lazy_tlb(&init_mm, current);
41}
42
43/*
44 * show_cpuinfo - Get information on one CPU for use by procfs.
45 */
46static int show_cpuinfo(struct seq_file *m, void *v)
47{
48	static const char *hwcap_str[] = {
49		"esan3", "zarch", "stfle", "msa", "ldisp", "eimm", "dfp",
50		"edat", "etf3eh", "highgprs", "te", "vx"
51	};
52	unsigned long n = (unsigned long) v - 1;
53	int i;
54
55	if (!n) {
56		s390_adjust_jiffies();
57		seq_printf(m, "vendor_id       : IBM/S390\n"
58			   "# processors    : %i\n"
59			   "bogomips per cpu: %lu.%02lu\n",
60			   num_online_cpus(), loops_per_jiffy/(500000/HZ),
61			   (loops_per_jiffy/(5000/HZ))%100);
62		seq_puts(m, "features\t: ");
63		for (i = 0; i < ARRAY_SIZE(hwcap_str); i++)
64			if (hwcap_str[i] && (elf_hwcap & (1UL << i)))
65				seq_printf(m, "%s ", hwcap_str[i]);
66		seq_puts(m, "\n");
67		show_cacheinfo(m);
68	}
69	get_online_cpus();
70	if (cpu_online(n)) {
71		struct cpuid *id = &per_cpu(cpu_id, n);
72		seq_printf(m, "processor %li: "
73			   "version = %02X,  "
74			   "identification = %06X,  "
75			   "machine = %04X\n",
76			   n, id->version, id->ident, id->machine);
77	}
78	put_online_cpus();
79	return 0;
80}
81
82static void *c_start(struct seq_file *m, loff_t *pos)
83{
84	return *pos < nr_cpu_ids ? (void *)((unsigned long) *pos + 1) : NULL;
85}
86
87static void *c_next(struct seq_file *m, void *v, loff_t *pos)
88{
89	++*pos;
90	return c_start(m, pos);
91}
92
93static void c_stop(struct seq_file *m, void *v)
94{
95}
96
97const struct seq_operations cpuinfo_op = {
98	.start	= c_start,
99	.next	= c_next,
100	.stop	= c_stop,
101	.show	= show_cpuinfo,
102};
103
104