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1/*
2 * arch/s390/kernel/processor.c
3 *
4 * Copyright IBM Corp. 2008
5 * Author(s): Martin Schwidefsky (schwidefsky@de.ibm.com)
6 */
7
8#define KMSG_COMPONENT "cpu"
9#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
10
11#include <linux/kernel.h>
12#include <linux/init.h>
13#include <linux/smp.h>
14#include <linux/seq_file.h>
15#include <linux/delay.h>
16#include <linux/cpu.h>
17#include <asm/elf.h>
18#include <asm/lowcore.h>
19#include <asm/param.h>
20
21static DEFINE_PER_CPU(struct cpuid, cpu_id);
22
23/*
24 * cpu_init - initializes state that is per-CPU.
25 */
26void __cpuinit cpu_init(void)
27{
28 struct cpuid *id = &per_cpu(cpu_id, smp_processor_id());
29
30 get_cpu_id(id);
31 atomic_inc(&init_mm.mm_count);
32 current->active_mm = &init_mm;
33 BUG_ON(current->mm);
34 enter_lazy_tlb(&init_mm, current);
35}
36
37/*
38 * show_cpuinfo - Get information on one CPU for use by procfs.
39 */
40static int show_cpuinfo(struct seq_file *m, void *v)
41{
42 static const char *hwcap_str[10] = {
43 "esan3", "zarch", "stfle", "msa", "ldisp", "eimm", "dfp",
44 "edat", "etf3eh", "highgprs"
45 };
46 unsigned long n = (unsigned long) v - 1;
47 int i;
48
49 if (!n) {
50 s390_adjust_jiffies();
51 seq_printf(m, "vendor_id : IBM/S390\n"
52 "# processors : %i\n"
53 "bogomips per cpu: %lu.%02lu\n",
54 num_online_cpus(), loops_per_jiffy/(500000/HZ),
55 (loops_per_jiffy/(5000/HZ))%100);
56 seq_puts(m, "features\t: ");
57 for (i = 0; i < 10; i++)
58 if (hwcap_str[i] && (elf_hwcap & (1UL << i)))
59 seq_printf(m, "%s ", hwcap_str[i]);
60 seq_puts(m, "\n");
61 }
62 get_online_cpus();
63 if (cpu_online(n)) {
64 struct cpuid *id = &per_cpu(cpu_id, n);
65 seq_printf(m, "processor %li: "
66 "version = %02X, "
67 "identification = %06X, "
68 "machine = %04X\n",
69 n, id->version, id->ident, id->machine);
70 }
71 put_online_cpus();
72 return 0;
73}
74
75static void *c_start(struct seq_file *m, loff_t *pos)
76{
77 return *pos < NR_CPUS ? (void *)((unsigned long) *pos + 1) : NULL;
78}
79
80static void *c_next(struct seq_file *m, void *v, loff_t *pos)
81{
82 ++*pos;
83 return c_start(m, pos);
84}
85
86static void c_stop(struct seq_file *m, void *v)
87{
88}
89
90const struct seq_operations cpuinfo_op = {
91 .start = c_start,
92 .next = c_next,
93 .stop = c_stop,
94 .show = show_cpuinfo,
95};
96
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/diag.h>
15#include <asm/elf.h>
16#include <asm/lowcore.h>
17#include <asm/param.h>
18#include <asm/smp.h>
19
20static DEFINE_PER_CPU(struct cpuid, cpu_id);
21
22void notrace cpu_relax(void)
23{
24 if (!smp_cpu_mtid && MACHINE_HAS_DIAG44) {
25 diag_stat_inc(DIAG_STAT_X044);
26 asm volatile("diag 0,0,0x44");
27 }
28 barrier();
29}
30EXPORT_SYMBOL(cpu_relax);
31
32/*
33 * cpu_init - initializes state that is per-CPU.
34 */
35void cpu_init(void)
36{
37 struct cpuid *id = this_cpu_ptr(&cpu_id);
38
39 get_cpu_id(id);
40 atomic_inc(&init_mm.mm_count);
41 current->active_mm = &init_mm;
42 BUG_ON(current->mm);
43 enter_lazy_tlb(&init_mm, current);
44}
45
46/*
47 * cpu_have_feature - Test CPU features on module initialization
48 */
49int cpu_have_feature(unsigned int num)
50{
51 return elf_hwcap & (1UL << num);
52}
53EXPORT_SYMBOL(cpu_have_feature);
54
55/*
56 * show_cpuinfo - Get information on one CPU for use by procfs.
57 */
58static int show_cpuinfo(struct seq_file *m, void *v)
59{
60 static const char *hwcap_str[] = {
61 "esan3", "zarch", "stfle", "msa", "ldisp", "eimm", "dfp",
62 "edat", "etf3eh", "highgprs", "te", "vx"
63 };
64 static const char * const int_hwcap_str[] = {
65 "sie"
66 };
67 unsigned long n = (unsigned long) v - 1;
68 int i;
69
70 if (!n) {
71 s390_adjust_jiffies();
72 seq_printf(m, "vendor_id : IBM/S390\n"
73 "# processors : %i\n"
74 "bogomips per cpu: %lu.%02lu\n",
75 num_online_cpus(), loops_per_jiffy/(500000/HZ),
76 (loops_per_jiffy/(5000/HZ))%100);
77 seq_puts(m, "features\t: ");
78 for (i = 0; i < ARRAY_SIZE(hwcap_str); i++)
79 if (hwcap_str[i] && (elf_hwcap & (1UL << i)))
80 seq_printf(m, "%s ", hwcap_str[i]);
81 for (i = 0; i < ARRAY_SIZE(int_hwcap_str); i++)
82 if (int_hwcap_str[i] && (int_hwcap & (1UL << i)))
83 seq_printf(m, "%s ", int_hwcap_str[i]);
84 seq_puts(m, "\n");
85 show_cacheinfo(m);
86 }
87 get_online_cpus();
88 if (cpu_online(n)) {
89 struct cpuid *id = &per_cpu(cpu_id, n);
90 seq_printf(m, "processor %li: "
91 "version = %02X, "
92 "identification = %06X, "
93 "machine = %04X\n",
94 n, id->version, id->ident, id->machine);
95 }
96 put_online_cpus();
97 return 0;
98}
99
100static void *c_start(struct seq_file *m, loff_t *pos)
101{
102 return *pos < nr_cpu_ids ? (void *)((unsigned long) *pos + 1) : NULL;
103}
104
105static void *c_next(struct seq_file *m, void *v, loff_t *pos)
106{
107 ++*pos;
108 return c_start(m, pos);
109}
110
111static void c_stop(struct seq_file *m, void *v)
112{
113}
114
115const struct seq_operations cpuinfo_op = {
116 .start = c_start,
117 .next = c_next,
118 .stop = c_stop,
119 .show = show_cpuinfo,
120};
121