Merge git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/devfs-2.6
[linux-2.6] / 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/iseries/hv_call_xm.h>
28
29 #include "processor_vpd.h"
30 #include "main_store.h"
31
32 static int __init iseries_proc_create(void)
33 {
34         struct proc_dir_entry *e = proc_mkdir("iSeries", 0);
35         if (!e)
36                 return 1;
37
38         return 0;
39 }
40 core_initcall(iseries_proc_create);
41
42 static unsigned long startTitan = 0;
43 static unsigned long startTb = 0;
44
45 static int proc_titantod_show(struct seq_file *m, void *v)
46 {
47         unsigned long tb0, titan_tod;
48
49         tb0 = get_tb();
50         titan_tod = HvCallXm_loadTod();
51
52         seq_printf(m, "Titan\n" );
53         seq_printf(m, "  time base =          %016lx\n", tb0);
54         seq_printf(m, "  titan tod =          %016lx\n", titan_tod);
55         seq_printf(m, "  xProcFreq =          %016x\n",
56                    xIoHriProcessorVpd[0].xProcFreq);
57         seq_printf(m, "  xTimeBaseFreq =      %016x\n",
58                    xIoHriProcessorVpd[0].xTimeBaseFreq);
59         seq_printf(m, "  tb_ticks_per_jiffy = %lu\n", tb_ticks_per_jiffy);
60         seq_printf(m, "  tb_ticks_per_usec  = %lu\n", tb_ticks_per_usec);
61
62         if (!startTitan) {
63                 startTitan = titan_tod;
64                 startTb = tb0;
65         } else {
66                 unsigned long titan_usec = (titan_tod - startTitan) >> 12;
67                 unsigned long tb_ticks = (tb0 - startTb);
68                 unsigned long titan_jiffies = titan_usec / (1000000/HZ);
69                 unsigned long titan_jiff_usec = titan_jiffies * (1000000/HZ);
70                 unsigned long titan_jiff_rem_usec =
71                         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 =
76                         tb_jiff_rem_ticks / tb_ticks_per_usec;
77                 unsigned long new_tb_ticks_per_jiffy =
78                         (tb_ticks * (1000000/HZ))/titan_usec;
79
80                 seq_printf(m, "  titan elapsed = %lu uSec\n", titan_usec);
81                 seq_printf(m, "  tb elapsed    = %lu ticks\n", tb_ticks);
82                 seq_printf(m, "  titan jiffies = %lu.%04lu \n", titan_jiffies,
83                            titan_jiff_rem_usec);
84                 seq_printf(m, "  tb jiffies    = %lu.%04lu\n", tb_jiffies,
85                            tb_jiff_rem_usec);
86                 seq_printf(m, "  new tb_ticks_per_jiffy = %lu\n",
87                            new_tb_ticks_per_jiffy);
88         }
89
90         return 0;
91 }
92
93 static int proc_titantod_open(struct inode *inode, struct file *file)
94 {
95         return single_open(file, proc_titantod_show, NULL);
96 }
97
98 static struct file_operations proc_titantod_operations = {
99         .open           = proc_titantod_open,
100         .read           = seq_read,
101         .llseek         = seq_lseek,
102         .release        = single_release,
103 };
104
105 static int __init iseries_proc_init(void)
106 {
107         struct proc_dir_entry *e;
108
109         e = create_proc_entry("iSeries/titanTod", S_IFREG|S_IRUGO, NULL);
110         if (e)
111                 e->proc_fops = &proc_titantod_operations;
112
113         return 0;
114 }
115 __initcall(iseries_proc_init);