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
21 static DEFINE_PER_CPU(struct cpuid, cpu_id);
22
23 /*
24 * cpu_init - initializes state that is per-CPU.
25 */
cpu_init(void)26 void __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 */
show_cpuinfo(struct seq_file * m,void * v)40 static 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
c_start(struct seq_file * m,loff_t * pos)75 static void *c_start(struct seq_file *m, loff_t *pos)
76 {
77 return *pos < nr_cpu_ids ? (void *)((unsigned long) *pos + 1) : NULL;
78 }
79
c_next(struct seq_file * m,void * v,loff_t * pos)80 static void *c_next(struct seq_file *m, void *v, loff_t *pos)
81 {
82 ++*pos;
83 return c_start(m, pos);
84 }
85
c_stop(struct seq_file * m,void * v)86 static void c_stop(struct seq_file *m, void *v)
87 {
88 }
89
90 const struct seq_operations cpuinfo_op = {
91 .start = c_start,
92 .next = c_next,
93 .stop = c_stop,
94 .show = show_cpuinfo,
95 };
96
97