linux/arch/powerpc/platforms/iseries/proc.c
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   1/*
   2 * Copyright (C) 2001  Kyle A. Lucke IBM Corporation
   3 * Copyright (C) 2001 Mike Corrigan & Dave Engebretsen IBM Corporation
   4 *
   5 * This program is free software; you can redistribute it and/or modify
   6 * it under the terms of the GNU General Public License as published by
   7 * the Free Software Foundation; either version 2 of the License, or
   8 * (at your option) any later version.
   9 *
  10 * This program is distributed in the hope that it will be useful,
  11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13 * GNU General Public License for more details.
  14 *
  15 * You should have received a copy of the GNU General Public License
  16 * along with this program; if not, write to the Free Software
  17 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
  18 */
  19#include <linux/init.h>
  20#include <linux/proc_fs.h>
  21#include <linux/seq_file.h>
  22#include <linux/param.h>                /* for HZ */
  23#include <asm/paca.h>
  24#include <asm/processor.h>
  25#include <asm/time.h>
  26#include <asm/lppaca.h>
  27#include <asm/firmware.h>
  28#include <asm/iseries/hv_call_xm.h>
  29
  30#include "processor_vpd.h"
  31#include "main_store.h"
  32
  33static int __init iseries_proc_create(void)
  34{
  35        struct proc_dir_entry *e;
  36
  37        if (!firmware_has_feature(FW_FEATURE_ISERIES))
  38                return 0;
  39
  40        e = proc_mkdir("iSeries", 0);
  41        if (!e)
  42                return 1;
  43
  44        return 0;
  45}
  46core_initcall(iseries_proc_create);
  47
  48static unsigned long startTitan = 0;
  49static unsigned long startTb = 0;
  50
  51static int proc_titantod_show(struct seq_file *m, void *v)
  52{
  53        unsigned long tb0, titan_tod;
  54
  55        tb0 = get_tb();
  56        titan_tod = HvCallXm_loadTod();
  57
  58        seq_printf(m, "Titan\n" );
  59        seq_printf(m, "  time base =          %016lx\n", tb0);
  60        seq_printf(m, "  titan tod =          %016lx\n", titan_tod);
  61        seq_printf(m, "  xProcFreq =          %016x\n",
  62                   xIoHriProcessorVpd[0].xProcFreq);
  63        seq_printf(m, "  xTimeBaseFreq =      %016x\n",
  64                   xIoHriProcessorVpd[0].xTimeBaseFreq);
  65        seq_printf(m, "  tb_ticks_per_jiffy = %lu\n", tb_ticks_per_jiffy);
  66        seq_printf(m, "  tb_ticks_per_usec  = %lu\n", tb_ticks_per_usec);
  67
  68        if (!startTitan) {
  69                startTitan = titan_tod;
  70                startTb = tb0;
  71        } else {
  72                unsigned long titan_usec = (titan_tod - startTitan) >> 12;
  73                unsigned long tb_ticks = (tb0 - startTb);
  74                unsigned long titan_jiffies = titan_usec / (1000000/HZ);
  75                unsigned long titan_jiff_usec = titan_jiffies * (1000000/HZ);
  76                unsigned long titan_jiff_rem_usec =
  77                        titan_usec - titan_jiff_usec;
  78                unsigned long tb_jiffies = tb_ticks / tb_ticks_per_jiffy;
  79                unsigned long tb_jiff_ticks = tb_jiffies * tb_ticks_per_jiffy;
  80                unsigned long tb_jiff_rem_ticks = tb_ticks - tb_jiff_ticks;
  81                unsigned long tb_jiff_rem_usec =
  82                        tb_jiff_rem_ticks / tb_ticks_per_usec;
  83                unsigned long new_tb_ticks_per_jiffy =
  84                        (tb_ticks * (1000000/HZ))/titan_usec;
  85
  86                seq_printf(m, "  titan elapsed = %lu uSec\n", titan_usec);
  87                seq_printf(m, "  tb elapsed    = %lu ticks\n", tb_ticks);
  88                seq_printf(m, "  titan jiffies = %lu.%04lu\n", titan_jiffies,
  89                           titan_jiff_rem_usec);
  90                seq_printf(m, "  tb jiffies    = %lu.%04lu\n", tb_jiffies,
  91                           tb_jiff_rem_usec);
  92                seq_printf(m, "  new tb_ticks_per_jiffy = %lu\n",
  93                           new_tb_ticks_per_jiffy);
  94        }
  95
  96        return 0;
  97}
  98
  99static int proc_titantod_open(struct inode *inode, struct file *file)
 100{
 101        return single_open(file, proc_titantod_show, NULL);
 102}
 103
 104static const struct file_operations proc_titantod_operations = {
 105        .open           = proc_titantod_open,
 106        .read           = seq_read,
 107        .llseek         = seq_lseek,
 108        .release        = single_release,
 109};
 110
 111static int __init iseries_proc_init(void)
 112{
 113        if (!firmware_has_feature(FW_FEATURE_ISERIES))
 114                return 0;
 115
 116        proc_create("iSeries/titanTod", S_IFREG|S_IRUGO, NULL,
 117                    &proc_titantod_operations);
 118        return 0;
 119}
 120__initcall(iseries_proc_init);
 121