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
  19 static DEFINE_PER_CPU(struct cpuid, cpu_id);
  20
  21 /*
  22  * cpu_init - initializes state that is per-CPU.
  23  */
  24 void 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  */
  40 static 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
  76 static 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
  81 static void *c_next(struct seq_file *m, void *v, loff_t *pos)
  82 {
  83         ++*pos;
  84         return c_start(m, pos);
  85 }
  86
  87 static void c_stop(struct seq_file *m, void *v)
  88 {
  89 }
  90
  91 const struct seq_operations cpuinfo_op = {
  92         .start  = c_start,
  93         .next   = c_next,
  94         .stop   = c_stop,
  95         .show   = show_cpuinfo,
  96 };
  97