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 const 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 const 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);
130