llseek: automatically add .llseek fop
[linux-2.6.git] / 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         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);