arch/tile/kernel/proc.c

   1 /*
   2  * Copyright 2010 Tilera Corporation. All Rights Reserved.
   3  *
   4  *   This program is free software; you can redistribute it and/or
   5  *   modify it under the terms of the GNU General Public License
   6  *   as published by the Free Software Foundation, version 2.
   7  *
   8  *   This program is distributed in the hope that it will be useful, but
   9  *   WITHOUT ANY WARRANTY; without even the implied warranty of
  10  *   MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
  11  *   NON INFRINGEMENT.  See the GNU General Public License for
  12  *   more details.
  13  */
  14
  15 #include <linux/smp.h>
  16 #include <linux/seq_file.h>
  17 #include <linux/threads.h>
  18 #include <linux/cpumask.h>
  19 #include <linux/timex.h>
  20 #include <linux/delay.h>
  21 #include <linux/fs.h>
  22 #include <linux/proc_fs.h>
  23 #include <linux/sysctl.h>
  24 #include <linux/hardirq.h>
  25 #include <linux/mman.h>
  26 #include <asm/pgtable.h>
  27 #include <asm/processor.h>
  28 #include <asm/sections.h>
  29 #include <asm/homecache.h>
  30 #include <arch/chip.h>
  31
  32
  33 /*
  34  * Support /proc/cpuinfo
  35  */
  36
  37 #define cpu_to_ptr(n) ((void *)((long)(n)+1))
  38 #define ptr_to_cpu(p) ((long)(p) - 1)
  39
  40 static int show_cpuinfo(struct seq_file *m, void *v)
  41 {
  42         int n = ptr_to_cpu(v);
  43
  44         if (n == 0) {
  45                 char buf[NR_CPUS*5];
  46                 cpulist_scnprintf(buf, sizeof(buf), cpu_online_mask);
  47                 seq_printf(m, "cpu count\t: %d\n", num_online_cpus());
  48                 seq_printf(m, "cpu list\t: %s\n", buf);
  49                 seq_printf(m, "model name\t: %s\n", chip_model);
  50                 seq_printf(m, "flags\t\t:\n");  /* nothing for now */
  51                 seq_printf(m, "cpu MHz\t\t: %llu.%06llu\n",
  52                            get_clock_rate() / 1000000,
  53                            (get_clock_rate() % 1000000));
  54                 seq_printf(m, "bogomips\t: %lu.%02lu\n\n",
  55                            loops_per_jiffy/(500000/HZ),
  56                            (loops_per_jiffy/(5000/HZ)) % 100);
  57         }
  58
  59 #ifdef CONFIG_SMP
  60         if (!cpu_online(n))
  61                 return 0;
  62 #endif
  63
  64         seq_printf(m, "processor\t: %d\n", n);
  65
  66         /* Print only num_online_cpus() blank lines total. */
  67         if (cpumask_next(n, cpu_online_mask) < nr_cpu_ids)
  68                 seq_printf(m, "\n");
  69
  70         return 0;
  71 }
  72
  73 static void *c_start(struct seq_file *m, loff_t *pos)
  74 {
  75         return *pos < nr_cpu_ids ? cpu_to_ptr(*pos) : NULL;
  76 }
  77 static void *c_next(struct seq_file *m, void *v, loff_t *pos)
  78 {
  79         ++*pos;
  80         return c_start(m, pos);
  81 }
  82 static void c_stop(struct seq_file *m, void *v)
  83 {
  84 }
  85 const struct seq_operations cpuinfo_op = {
  86         .start  = c_start,
  87         .next   = c_next,
  88         .stop   = c_stop,
  89         .show   = show_cpuinfo,
  90 };