LXR linux/arch/s390/kernel/processor.c

   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/smp.h>
  12#include <linux/seq_file.h>
  13#include <linux/delay.h>
  14#include <linux/cpu.h>
  15#include <asm/elf.h>
  16#include <asm/lowcore.h>
  17#include <asm/param.h>
  18
  19static DEFINE_PER_CPU(struct cpuid, cpu_id);
  20
  21/*
  22 * cpu_init - initializes state that is per-CPU.
  23 */
  24void cpu_init(void)
  25{
  26        struct s390_idle_data *idle = &__get_cpu_var(s390_idle);
  27        struct cpuid *id = &__get_cpu_var(cpu_id);
  28
  29        get_cpu_id(id);
  30        atomic_inc(&init_mm.mm_count);
  31        current->active_mm = &init_mm;
  32        BUG_ON(current->mm);
  33        enter_lazy_tlb(&init_mm, current);
  34        memset(idle, 0, sizeof(*idle));
  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[] = {
  43                "esan3", "zarch", "stfle", "msa", "ldisp", "eimm", "dfp",
  44                "edat", "etf3eh", "highgprs", "te"
  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 < ARRAY_SIZE(hwcap_str); i++)
  58                        if (hwcap_str[i] && (elf_hwcap & (1UL << i)))
  59                                seq_printf(m, "%s ", hwcap_str[i]);
  60                seq_puts(m, "\n");
  61                show_cacheinfo(m);
  62        }
  63        get_online_cpus();
  64        if (cpu_online(n)) {
  65                struct cpuid *id = &per_cpu(cpu_id, n);
  66                seq_printf(m, "processor %li: "
  67                           "version = %02X,  "
  68                           "identification = %06X,  "
  69                           "machine = %04X\n",
  70                           n, id->version, id->ident, id->machine);
  71        }
  72        put_online_cpus();
  73        return 0;
  74}
  75
  76static void *c_start(struct seq_file *m, loff_t *pos)
  77{
  78        return *pos < nr_cpu_ids ? (void *)((unsigned long) *pos + 1) : NULL;
  79}
  80
  81static void *c_next(struct seq_file *m, void *v, loff_t *pos)
  82{
  83        ++*pos;
  84        return c_start(m, pos);
  85}
  86
  87static void c_stop(struct seq_file *m, void *v)
  88{
  89}
  90
  91const struct seq_operations cpuinfo_op = {
  92        .start  = c_start,
  93        .next   = c_next,
  94        .stop   = c_stop,
  95        .show   = show_cpuinfo,
  96};
  97
  98