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