MIPS: Loongson: Add oprofile support
[kernel.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, 2005 Ralf Baechle
7  * Copyright (C) 2005 MIPS Technologies, Inc.
8  */
9 #include <linux/errno.h>
10 #include <linux/init.h>
11 #include <linux/oprofile.h>
12 #include <linux/smp.h>
13 #include <asm/cpu-info.h>
14
15 #include "op_impl.h"
16
17 extern struct op_mips_model op_model_mipsxx_ops __attribute__((weak));
18 extern struct op_mips_model op_model_rm9000_ops __attribute__((weak));
19 extern struct op_mips_model op_model_loongson2_ops __attribute__((weak));
20
21 static struct op_mips_model *model;
22
23 static struct op_counter_config ctr[20];
24
25 static int op_mips_setup(void)
26 {
27         /* Pre-compute the values to stuff in the hardware registers.  */
28         model->reg_setup(ctr);
29
30         /* Configure the registers on all cpus.  */
31         on_each_cpu(model->cpu_setup, NULL, 1);
32
33         return 0;
34 }
35
36 static int op_mips_create_files(struct super_block *sb, struct dentry *root)
37 {
38         int i;
39
40         for (i = 0; i < model->num_counters; ++i) {
41                 struct dentry *dir;
42                 char buf[4];
43
44                 snprintf(buf, sizeof buf, "%d", i);
45                 dir = oprofilefs_mkdir(sb, root, buf);
46
47                 oprofilefs_create_ulong(sb, dir, "enabled", &ctr[i].enabled);
48                 oprofilefs_create_ulong(sb, dir, "event", &ctr[i].event);
49                 oprofilefs_create_ulong(sb, dir, "count", &ctr[i].count);
50                 oprofilefs_create_ulong(sb, dir, "kernel", &ctr[i].kernel);
51                 oprofilefs_create_ulong(sb, dir, "user", &ctr[i].user);
52                 oprofilefs_create_ulong(sb, dir, "exl", &ctr[i].exl);
53                 /* Dummy.  */
54                 oprofilefs_create_ulong(sb, dir, "unit_mask", &ctr[i].unit_mask);
55         }
56
57         return 0;
58 }
59
60 static int op_mips_start(void)
61 {
62         on_each_cpu(model->cpu_start, NULL, 1);
63
64         return 0;
65 }
66
67 static void op_mips_stop(void)
68 {
69         /* Disable performance monitoring for all counters.  */
70         on_each_cpu(model->cpu_stop, NULL, 1);
71 }
72
73 int __init oprofile_arch_init(struct oprofile_operations *ops)
74 {
75         struct op_mips_model *lmodel = NULL;
76         int res;
77
78         switch (current_cpu_type()) {
79         case CPU_5KC:
80         case CPU_20KC:
81         case CPU_24K:
82         case CPU_25KF:
83         case CPU_34K:
84         case CPU_1004K:
85         case CPU_74K:
86         case CPU_SB1:
87         case CPU_SB1A:
88         case CPU_R10000:
89         case CPU_R12000:
90         case CPU_R14000:
91                 lmodel = &op_model_mipsxx_ops;
92                 break;
93
94         case CPU_RM9000:
95                 lmodel = &op_model_rm9000_ops;
96                 break;
97         case CPU_LOONGSON2:
98                 lmodel = &op_model_loongson2_ops;
99                 break;
100         };
101
102         if (!lmodel)
103                 return -ENODEV;
104
105         res = lmodel->init();
106         if (res)
107                 return res;
108
109         model = lmodel;
110
111         ops->create_files       = op_mips_create_files;
112         ops->setup              = op_mips_setup;
113         //ops->shutdown         = op_mips_shutdown;
114         ops->start              = op_mips_start;
115         ops->stop               = op_mips_stop;
116         ops->cpu_type           = lmodel->cpu_type;
117
118         printk(KERN_INFO "oprofile: using %s performance monitoring.\n",
119                lmodel->cpu_type);
120
121         return 0;
122 }
123
124 void oprofile_arch_exit(void)
125 {
126         if (model)
127                 model->exit();
128 }