Linux-2.6.12-rc2
[linux-2.6.git] / arch / mips / oprofile / common.c
1 /*
2  * This file is subject to the terms and conditions of the GNU General Public
3  * License.  See the file "COPYING" in the main directory of this archive
4  * for more details.
5  *
6  * Copyright (C) 2004 by Ralf Baechle
7  */
8 #include <linux/errno.h>
9 #include <linux/init.h>
10 #include <linux/oprofile.h>
11 #include <linux/smp.h>
12 #include <asm/cpu-info.h>
13
14 #include "op_impl.h"
15
16 extern struct op_mips_model op_model_mipsxx __attribute__((weak));
17 extern struct op_mips_model op_model_rm9000 __attribute__((weak));
18
19 static struct op_mips_model *model;
20
21 static struct op_counter_config ctr[20];
22
23 static int op_mips_setup(void)
24 {
25         /* Pre-compute the values to stuff in the hardware registers.  */
26         model->reg_setup(ctr);
27
28         /* Configure the registers on all cpus.  */
29         on_each_cpu(model->cpu_setup, 0, 0, 1);
30
31         return 0;
32 }
33
34 static int op_mips_create_files(struct super_block * sb, struct dentry * root)
35 {
36         int i;
37
38         for (i = 0; i < model->num_counters; ++i) {
39                 struct dentry *dir;
40                 char buf[3];
41
42                 snprintf(buf, sizeof buf, "%d", i);
43                 dir = oprofilefs_mkdir(sb, root, buf);
44
45                 oprofilefs_create_ulong(sb, dir, "enabled", &ctr[i].enabled);
46                 oprofilefs_create_ulong(sb, dir, "event", &ctr[i].event);
47                 oprofilefs_create_ulong(sb, dir, "count", &ctr[i].count);
48                 /* Dummies.  */
49                 oprofilefs_create_ulong(sb, dir, "kernel", &ctr[i].kernel);
50                 oprofilefs_create_ulong(sb, dir, "user", &ctr[i].user);
51                 oprofilefs_create_ulong(sb, dir, "exl", &ctr[i].exl);
52                 oprofilefs_create_ulong(sb, dir, "unit_mask", &ctr[i].unit_mask);
53         }
54
55         return 0;
56 }
57
58 static int op_mips_start(void)
59 {
60         on_each_cpu(model->cpu_start, NULL, 0, 1);
61
62         return 0;
63 }
64
65 static void op_mips_stop(void)
66 {
67         /* Disable performance monitoring for all counters.  */
68         on_each_cpu(model->cpu_stop, NULL, 0, 1);
69 }
70
71 void __init oprofile_arch_init(struct oprofile_operations *ops)
72 {
73         struct op_mips_model *lmodel = NULL;
74
75         switch (current_cpu_data.cputype) {
76         case CPU_24K:
77                 lmodel = &op_model_mipsxx;
78                 break;
79
80         case CPU_RM9000:
81                 lmodel = &op_model_rm9000;
82                 break;
83         };
84
85         if (!lmodel)
86                 return;
87
88         if (lmodel->init())
89                 return;
90
91         model = lmodel;
92
93         ops->create_files = op_mips_create_files;
94         ops->setup = op_mips_setup;
95         ops->start = op_mips_start;
96         ops->stop = op_mips_stop;
97         ops->cpu_type = lmodel->cpu_type;
98
99         printk(KERN_INFO "oprofile: using %s performance monitoring.\n",
100                lmodel->cpu_type);
101 }
102
103 void oprofile_arch_exit(void)
104 {
105         model->exit();
106 }