arch/powerpc/platforms/iseries/proc.c

   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
  33 static 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 }
  46 core_initcall(iseries_proc_create);
  47
  48 static unsigned long startTitan = 0;
  49 static unsigned long startTb = 0;
  50
  51 static 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
  99 static int proc_titantod_open(struct inode *inode, struct file *file)
 100 {
 101         return single_open(file, proc_titantod_show, NULL);
 102 }
 103
 104 static 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
 111 static int __init iseries_proc_init(void)
 112 {
 113         struct proc_dir_entry *e;
 114
 115         if (!firmware_has_feature(FW_FEATURE_ISERIES))
 116                 return 0;
 117
 118         e = create_proc_entry("iSeries/titanTod", S_IFREG|S_IRUGO, NULL);
 119         if (e)
 120                 e->proc_fops = &proc_titantod_operations;
 121
 122         return 0;
 123 }
 124 __initcall(iseries_proc_init);