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   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
  21 void __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
  32 static int show_cpuinfo(struct seq_file *m, void *v)
  33 {
  34         static const char *hwcap_str[9] = {
  35                 "esan3", "zarch", "stfle", "msa", "ldisp", "eimm", "dfp",
  36                 "edat", "etf3eh"
  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 < 9; 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
  76 static void *c_start(struct seq_file *m, loff_t *pos)
  77 {
  78         return *pos < NR_CPUS ? (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