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

   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
  17#include <asm/elf.h>
  18#include <asm/lowcore.h>
  19#include <asm/param.h>
  20
  21void __cpuinit print_cpu_info(void)
  22{
  23        pr_info("Processor %d started, address %d, identification %06X\n",
  24                S390_lowcore.cpu_nr, S390_lowcore.cpu_addr,
  25                S390_lowcore.cpu_id.ident);
  26}
  27
  28/*
  29 * show_cpuinfo - Get information on one CPU for use by procfs.
  30 */
  31
  32static int show_cpuinfo(struct seq_file *m, void *v)
  33{
  34        static const char *hwcap_str[10] = {
  35                "esan3", "zarch", "stfle", "msa", "ldisp", "eimm", "dfp",
  36                "edat", "etf3eh", "highgprs"
  37        };
  38        struct _lowcore *lc;
  39        unsigned long n = (unsigned long) v - 1;
  40        int i;
  41
  42        s390_adjust_jiffies();
  43        preempt_disable();
  44        if (!n) {
  45                seq_printf(m, "vendor_id       : IBM/S390\n"
  46                           "# processors    : %i\n"
  47                           "bogomips per cpu: %lu.%02lu\n",
  48                           num_online_cpus(), loops_per_jiffy/(500000/HZ),
  49                           (loops_per_jiffy/(5000/HZ))%100);
  50                seq_puts(m, "features\t: ");
  51                for (i = 0; i < 10; i++)
  52                        if (hwcap_str[i] && (elf_hwcap & (1UL << i)))
  53                                seq_printf(m, "%s ", hwcap_str[i]);
  54                seq_puts(m, "\n");
  55        }
  56
  57        if (cpu_online(n)) {
  58#ifdef CONFIG_SMP
  59                lc = (smp_processor_id() == n) ?
  60                        &S390_lowcore : lowcore_ptr[n];
  61#else
  62                lc = &S390_lowcore;
  63#endif
  64                seq_printf(m, "processor %li: "
  65                           "version = %02X,  "
  66                           "identification = %06X,  "
  67                           "machine = %04X\n",
  68                           n, lc->cpu_id.version,
  69                           lc->cpu_id.ident,
  70                           lc->cpu_id.machine);
  71        }
  72        preempt_enable();
  73        return 0;
  74}
  75
  76static void *c_start(struct seq_file *m, loff_t *pos)
  77{
  78        return *pos < NR_CPUS ? (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