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/hugetlb.h>
  26 #include <linux/mman.h>
  27 #include <asm/unaligned.h>
  28 #include <asm/pgtable.h>
  29 #include <asm/processor.h>
  30 #include <asm/sections.h>
  31 #include <asm/homecache.h>
  32 #include <asm/hardwall.h>
  33 #include <arch/chip.h>
  34
  35
  36 /*
  37  * Support /proc/cpuinfo
  38  */
  39
  40 #define cpu_to_ptr(n) ((void *)((long)(n)+1))
  41 #define ptr_to_cpu(p) ((long)(p) - 1)
  42
  43 static int show_cpuinfo(struct seq_file *m, void *v)
  44 {
  45         int n = ptr_to_cpu(v);
  46
  47         if (n == 0) {
  48                 char buf[NR_CPUS*5];
  49                 cpulist_scnprintf(buf, sizeof(buf), cpu_online_mask);
  50                 seq_printf(m, "cpu count\t: %d\n", num_online_cpus());
  51                 seq_printf(m, "cpu list\t: %s\n", buf);
  52                 seq_printf(m, "model name\t: %s\n", chip_model);
  53                 seq_printf(m, "flags\t\t:\n");  /* nothing for now */
  54                 seq_printf(m, "cpu MHz\t\t: %llu.%06llu\n",
  55                            get_clock_rate() / 1000000,
  56                            (get_clock_rate() % 1000000));
  57                 seq_printf(m, "bogomips\t: %lu.%02lu\n\n",
  58                            loops_per_jiffy/(500000/HZ),
  59                            (loops_per_jiffy/(5000/HZ)) % 100);
  60         }
  61
  62 #ifdef CONFIG_SMP
  63         if (!cpu_online(n))
  64                 return 0;
  65 #endif
  66
  67         seq_printf(m, "processor\t: %d\n", n);
  68
  69         /* Print only num_online_cpus() blank lines total. */
  70         if (cpumask_next(n, cpu_online_mask) < nr_cpu_ids)
  71                 seq_printf(m, "\n");
  72
  73         return 0;
  74 }
  75
  76 static void *c_start(struct seq_file *m, loff_t *pos)
  77 {
  78         return *pos < nr_cpu_ids ? cpu_to_ptr(*pos) : NULL;
  79 }
  80 static void *c_next(struct seq_file *m, void *v, loff_t *pos)
  81 {
  82         ++*pos;
  83         return c_start(m, pos);
  84 }
  85 static void c_stop(struct seq_file *m, void *v)
  86 {
  87 }
  88 const struct seq_operations cpuinfo_op = {
  89         .start  = c_start,
  90         .next   = c_next,
  91         .stop   = c_stop,
  92         .show   = show_cpuinfo,
  93 };
  94
  95 /*
  96  * Support /proc/tile directory
  97  */
  98
  99 static int __init proc_tile_init(void)
 100 {
 101         struct proc_dir_entry *root = proc_mkdir("tile", NULL);
 102         if (root == NULL)
 103                 return 0;
 104
 105         proc_tile_hardwall_init(root);
 106
 107         return 0;
 108 }
 109
 110 arch_initcall(proc_tile_init);
 111
 112 /*
 113  * Support /proc/sys/tile directory
 114  */
 115
 116 #ifndef __tilegx__  /* FIXME: GX: no support for unaligned access yet */
 117 static ctl_table unaligned_subtable[] = {
 118         {
 119                 .procname       = "enabled",
 120                 .data           = &unaligned_fixup,
 121                 .maxlen         = sizeof(int),
 122                 .mode           = 0644,
 123                 .proc_handler   = &proc_dointvec
 124         },
 125         {
 126                 .procname       = "printk",
 127                 .data           = &unaligned_printk,
 128                 .maxlen         = sizeof(int),
 129                 .mode           = 0644,
 130                 .proc_handler   = &proc_dointvec
 131         },
 132         {
 133                 .procname       = "count",
 134                 .data           = &unaligned_fixup_count,
 135                 .maxlen         = sizeof(int),
 136                 .mode           = 0644,
 137                 .proc_handler   = &proc_dointvec
 138         },
 139         {}
 140 };
 141
 142 static ctl_table unaligned_table[] = {
 143         {
 144                 .procname       = "unaligned_fixup",
 145                 .mode           = 0555,
 146                 .child          = unaligned_subtable
 147         },
 148         {}
 149 };
 150
 151 static struct ctl_path tile_path[] = {
 152         { .procname = "tile" },
 153         { }
 154 };
 155
 156 static int __init proc_sys_tile_init(void)
 157 {
 158         register_sysctl_paths(tile_path, unaligned_table);
 159         return 0;
 160 }
 161
 162 arch_initcall(proc_sys_tile_init);
 163 #endif