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proc.c

/*
 * Copyright (C) 2001  Kyle A. Lucke IBM Corporation
 * Copyright (C) 2001 Mike Corrigan & Dave Engebretsen IBM Corporation
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
 */
#include <linux/init.h>
#include <linux/proc_fs.h>
#include <linux/seq_file.h>
#include <linux/param.h>            /* for HZ */
#include <asm/paca.h>
#include <asm/processor.h>
#include <asm/time.h>
#include <asm/lppaca.h>
#include <asm/firmware.h>
#include <asm/iseries/hv_call_xm.h>

#include "processor_vpd.h"
#include "main_store.h"

static int __init iseries_proc_create(void)
{
      struct proc_dir_entry *e;

      if (!firmware_has_feature(FW_FEATURE_ISERIES))
            return 0;

      e = proc_mkdir("iSeries", 0);
      if (!e)
            return 1;

      return 0;
}
core_initcall(iseries_proc_create);

static unsigned long startTitan = 0;
static unsigned long startTb = 0;

static int proc_titantod_show(struct seq_file *m, void *v)
{
      unsigned long tb0, titan_tod;

      tb0 = get_tb();
      titan_tod = HvCallXm_loadTod();

      seq_printf(m, "Titan\n" );
      seq_printf(m, "  time base =          %016lx\n", tb0);
      seq_printf(m, "  titan tod =          %016lx\n", titan_tod);
      seq_printf(m, "  xProcFreq =          %016x\n",
               xIoHriProcessorVpd[0].xProcFreq);
      seq_printf(m, "  xTimeBaseFreq =      %016x\n",
               xIoHriProcessorVpd[0].xTimeBaseFreq);
      seq_printf(m, "  tb_ticks_per_jiffy = %lu\n", tb_ticks_per_jiffy);
      seq_printf(m, "  tb_ticks_per_usec  = %lu\n", tb_ticks_per_usec);

      if (!startTitan) {
            startTitan = titan_tod;
            startTb = tb0;
      } else {
            unsigned long titan_usec = (titan_tod - startTitan) >> 12;
            unsigned long tb_ticks = (tb0 - startTb);
            unsigned long titan_jiffies = titan_usec / (1000000/HZ);
            unsigned long titan_jiff_usec = titan_jiffies * (1000000/HZ);
            unsigned long titan_jiff_rem_usec =
                  titan_usec - titan_jiff_usec;
            unsigned long tb_jiffies = tb_ticks / tb_ticks_per_jiffy;
            unsigned long tb_jiff_ticks = tb_jiffies * tb_ticks_per_jiffy;
            unsigned long tb_jiff_rem_ticks = tb_ticks - tb_jiff_ticks;
            unsigned long tb_jiff_rem_usec =
                  tb_jiff_rem_ticks / tb_ticks_per_usec;
            unsigned long new_tb_ticks_per_jiffy =
                  (tb_ticks * (1000000/HZ))/titan_usec;

            seq_printf(m, "  titan elapsed = %lu uSec\n", titan_usec);
            seq_printf(m, "  tb elapsed    = %lu ticks\n", tb_ticks);
            seq_printf(m, "  titan jiffies = %lu.%04lu \n", titan_jiffies,
                     titan_jiff_rem_usec);
            seq_printf(m, "  tb jiffies    = %lu.%04lu\n", tb_jiffies,
                     tb_jiff_rem_usec);
            seq_printf(m, "  new tb_ticks_per_jiffy = %lu\n",
                     new_tb_ticks_per_jiffy);
      }

      return 0;
}

static int proc_titantod_open(struct inode *inode, struct file *file)
{
      return single_open(file, proc_titantod_show, NULL);
}

static const struct file_operations proc_titantod_operations = {
      .open       = proc_titantod_open,
      .read       = seq_read,
      .llseek           = seq_lseek,
      .release    = single_release,
};

static int __init iseries_proc_init(void)
{
      if (!firmware_has_feature(FW_FEATURE_ISERIES))
            return 0;

      proc_create("iSeries/titanTod", S_IFREG|S_IRUGO, NULL,
                &proc_titantod_operations);
      return 0;
}
__initcall(iseries_proc_init);

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