arch/ppc64/kernel/iSeries_proc.c

   1 /*
   2  * iSeries_proc.c
   3  * Copyright (C) 2001  Kyle A. Lucke IBM Corporation
   4  * Copyright (C) 2001 Mike Corrigan & Dave Engebretsen IBM Corporation
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation; either version 2 of the License, or
   9  * (at your option) any later version.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * along with this program; if not, write to the Free Software
  18  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
  19  */
  20 #include <linux/init.h>
  21 #include <linux/proc_fs.h>
  22 #include <linux/seq_file.h>
  23 #include <linux/param.h>                /* for HZ */
  24 #include <asm/paca.h>
  25 #include <asm/processor.h>
  26 #include <asm/time.h>
  27 #include <asm/lppaca.h>
  28 #include <asm/iSeries/ItLpQueue.h>
  29 #include <asm/iSeries/HvCallXm.h>
  30 #include <asm/iSeries/IoHriMainStore.h>
  31 #include <asm/iSeries/IoHriProcessorVpd.h>
  32
  33 static int __init iseries_proc_create(void)
  34 {
  35         struct proc_dir_entry *e = proc_mkdir("iSeries", 0);
  36         if (!e)
  37                 return 1;
  38
  39         return 0;
  40 }
  41 core_initcall(iseries_proc_create);
  42
  43 static unsigned long startTitan = 0;
  44 static unsigned long startTb = 0;
  45
  46 static int proc_titantod_show(struct seq_file *m, void *v)
  47 {
  48         unsigned long tb0, titan_tod;
  49
  50         tb0 = get_tb();
  51         titan_tod = HvCallXm_loadTod();
  52
  53         seq_printf(m, "Titan\n" );
  54         seq_printf(m, "  time base =          %016lx\n", tb0);
  55         seq_printf(m, "  titan tod =          %016lx\n", titan_tod);
  56         seq_printf(m, "  xProcFreq =          %016x\n",
  57                    xIoHriProcessorVpd[0].xProcFreq);
  58         seq_printf(m, "  xTimeBaseFreq =      %016x\n",
  59                    xIoHriProcessorVpd[0].xTimeBaseFreq);
  60         seq_printf(m, "  tb_ticks_per_jiffy = %lu\n", tb_ticks_per_jiffy);
  61         seq_printf(m, "  tb_ticks_per_usec  = %lu\n", tb_ticks_per_usec);
  62
  63         if (!startTitan) {
  64                 startTitan = titan_tod;
  65                 startTb = tb0;
  66         } else {
  67                 unsigned long titan_usec = (titan_tod - startTitan) >> 12;
  68                 unsigned long tb_ticks = (tb0 - startTb);
  69                 unsigned long titan_jiffies = titan_usec / (1000000/HZ);
  70                 unsigned long titan_jiff_usec = titan_jiffies * (1000000/HZ);
  71                 unsigned long titan_jiff_rem_usec = titan_usec - titan_jiff_usec;
  72                 unsigned long tb_jiffies = tb_ticks / tb_ticks_per_jiffy;
  73                 unsigned long tb_jiff_ticks = tb_jiffies * tb_ticks_per_jiffy;
  74                 unsigned long tb_jiff_rem_ticks = tb_ticks - tb_jiff_ticks;
  75                 unsigned long tb_jiff_rem_usec = tb_jiff_rem_ticks / tb_ticks_per_usec;
  76                 unsigned long new_tb_ticks_per_jiffy = (tb_ticks * (1000000/HZ))/titan_usec;
  77
  78                 seq_printf(m, "  titan elapsed = %lu uSec\n", titan_usec);
  79                 seq_printf(m, "  tb elapsed    = %lu ticks\n", tb_ticks);
  80                 seq_printf(m, "  titan jiffies = %lu.%04lu \n", titan_jiffies,
  81                            titan_jiff_rem_usec);
  82                 seq_printf(m, "  tb jiffies    = %lu.%04lu\n", tb_jiffies,
  83                            tb_jiff_rem_usec);
  84                 seq_printf(m, "  new tb_ticks_per_jiffy = %lu\n",
  85                            new_tb_ticks_per_jiffy);
  86         }
  87
  88         return 0;
  89 }
  90
  91 static int proc_titantod_open(struct inode *inode, struct file *file)
  92 {
  93         return single_open(file, proc_titantod_show, NULL);
  94 }
  95
  96 static struct file_operations proc_titantod_operations = {
  97         .open           = proc_titantod_open,
  98         .read           = seq_read,
  99         .llseek         = seq_lseek,
 100         .release        = single_release,
 101 };
 102
 103 static int __init iseries_proc_init(void)
 104 {
 105         struct proc_dir_entry *e;
 106
 107         e = create_proc_entry("iSeries/titanTod", S_IFREG|S_IRUGO, NULL);
 108         if (e)
 109                 e->proc_fops = &proc_titantod_operations;
 110
 111         return 0;
 112 }
 113 __initcall(iseries_proc_init);