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/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
 122