Merge branch 'upstream-linus' of master.kernel.org:/pub/scm/linux/kernel/git/jgarzik...
[linux-2.6] / arch / powerpc / platforms / pseries / hvCall_inst.c
1 /*
2  * Copyright (C) 2006 Mike Kravetz IBM Corporation
3  *
4  * Hypervisor Call Instrumentation
5  *
6  * This program is free software; you can redistribute it and/or modify
7  * it under the terms of the GNU General Public License as published by
8  * the Free Software Foundation; either version 2 of the License, or
9  * (at your option) any later version.
10  *
11  * This program is distributed in the hope that it will be useful,
12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
14  * GNU General Public License for more details.
15  *
16  * You should have received a copy of the GNU General Public License
17  * along with this program; if not, write to the Free Software
18  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
19  */
20
21 #include <linux/kernel.h>
22 #include <linux/percpu.h>
23 #include <linux/debugfs.h>
24 #include <linux/seq_file.h>
25 #include <linux/cpumask.h>
26 #include <asm/hvcall.h>
27 #include <asm/firmware.h>
28 #include <asm/cputable.h>
29
30 DEFINE_PER_CPU(struct hcall_stats[HCALL_STAT_ARRAY_SIZE], hcall_stats);
31
32 /*
33  * Routines for displaying the statistics in debugfs
34  */
35 static void *hc_start(struct seq_file *m, loff_t *pos)
36 {
37         if ((int)*pos < (HCALL_STAT_ARRAY_SIZE-1))
38                 return (void *)(unsigned long)(*pos + 1);
39
40         return NULL;
41 }
42
43 static void *hc_next(struct seq_file *m, void *p, loff_t * pos)
44 {
45         ++*pos;
46
47         return hc_start(m, pos);
48 }
49
50 static void hc_stop(struct seq_file *m, void *p)
51 {
52 }
53
54 static int hc_show(struct seq_file *m, void *p)
55 {
56         unsigned long h_num = (unsigned long)p;
57         struct hcall_stats *hs = (struct hcall_stats *)m->private;
58
59         if (hs[h_num].num_calls) {
60                 if (cpu_has_feature(CPU_FTR_PURR))
61                         seq_printf(m, "%lu %lu %lu %lu\n", h_num<<2,
62                                    hs[h_num].num_calls,
63                                    hs[h_num].tb_total,
64                                    hs[h_num].purr_total);
65                 else
66                         seq_printf(m, "%lu %lu %lu\n", h_num<<2,
67                                    hs[h_num].num_calls,
68                                    hs[h_num].tb_total);
69         }
70
71         return 0;
72 }
73
74 static struct seq_operations hcall_inst_seq_ops = {
75         .start = hc_start,
76         .next  = hc_next,
77         .stop  = hc_stop,
78         .show  = hc_show
79 };
80
81 static int hcall_inst_seq_open(struct inode *inode, struct file *file)
82 {
83         int rc;
84         struct seq_file *seq;
85
86         rc = seq_open(file, &hcall_inst_seq_ops);
87         seq = file->private_data;
88         seq->private = file->f_path.dentry->d_inode->i_private;
89
90         return rc;
91 }
92
93 static struct file_operations hcall_inst_seq_fops = {
94         .open = hcall_inst_seq_open,
95         .read = seq_read,
96         .llseek = seq_lseek,
97         .release = seq_release,
98 };
99
100 #define HCALL_ROOT_DIR          "hcall_inst"
101 #define CPU_NAME_BUF_SIZE       32
102
103 static int __init hcall_inst_init(void)
104 {
105         struct dentry *hcall_root;
106         struct dentry *hcall_file;
107         char cpu_name_buf[CPU_NAME_BUF_SIZE];
108         int cpu;
109
110         if (!firmware_has_feature(FW_FEATURE_LPAR))
111                 return 0;
112
113         hcall_root = debugfs_create_dir(HCALL_ROOT_DIR, NULL);
114         if (!hcall_root)
115                 return -ENOMEM;
116
117         for_each_possible_cpu(cpu) {
118                 snprintf(cpu_name_buf, CPU_NAME_BUF_SIZE, "cpu%d", cpu);
119                 hcall_file = debugfs_create_file(cpu_name_buf, S_IRUGO,
120                                                  hcall_root,
121                                                  per_cpu(hcall_stats, cpu),
122                                                  &hcall_inst_seq_fops);
123                 if (!hcall_file)
124                         return -ENOMEM;
125         }
126
127         return 0;
128 }
129 __initcall(hcall_inst_init);