Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/shaggy...
[linux-2.6] / arch / powerpc / oprofile / common.c
1 /*
2  * PPC 64 oprofile support:
3  * Copyright (C) 2004 Anton Blanchard <anton@au.ibm.com>, IBM
4  * PPC 32 oprofile support: (based on PPC 64 support)
5  * Copyright (C) Freescale Semiconductor, Inc 2004
6  *      Author: Andy Fleming
7  *
8  * Based on alpha version.
9  *
10  * This program is free software; you can redistribute it and/or
11  * modify it under the terms of the GNU General Public License
12  * as published by the Free Software Foundation; either version
13  * 2 of the License, or (at your option) any later version.
14  */
15
16 #include <linux/oprofile.h>
17 #include <linux/init.h>
18 #include <linux/smp.h>
19 #include <linux/errno.h>
20 #include <asm/ptrace.h>
21 #include <asm/system.h>
22 #include <asm/pmc.h>
23 #include <asm/cputable.h>
24 #include <asm/oprofile_impl.h>
25 #include <asm/firmware.h>
26
27 static struct op_powerpc_model *model;
28
29 static struct op_counter_config ctr[OP_MAX_COUNTER];
30 static struct op_system_config sys;
31
32 static void op_handle_interrupt(struct pt_regs *regs)
33 {
34         model->handle_interrupt(regs, ctr);
35 }
36
37 static void op_powerpc_cpu_setup(void *dummy)
38 {
39         model->cpu_setup(ctr);
40 }
41
42 static int op_powerpc_setup(void)
43 {
44         int err;
45
46         /* Grab the hardware */
47         err = reserve_pmc_hardware(op_handle_interrupt);
48         if (err)
49                 return err;
50
51         /* Pre-compute the values to stuff in the hardware registers.  */
52         model->reg_setup(ctr, &sys, model->num_counters);
53
54         /* Configure the registers on all cpus.  */
55         on_each_cpu(op_powerpc_cpu_setup, NULL, 0, 1);
56
57         return 0;
58 }
59
60 static void op_powerpc_shutdown(void)
61 {
62         release_pmc_hardware();
63 }
64
65 static void op_powerpc_cpu_start(void *dummy)
66 {
67         model->start(ctr);
68 }
69
70 static int op_powerpc_start(void)
71 {
72         on_each_cpu(op_powerpc_cpu_start, NULL, 0, 1);
73         return 0;
74 }
75
76 static inline void op_powerpc_cpu_stop(void *dummy)
77 {
78         model->stop();
79 }
80
81 static void op_powerpc_stop(void)
82 {
83         on_each_cpu(op_powerpc_cpu_stop, NULL, 0, 1);
84 }
85
86 static int op_powerpc_create_files(struct super_block *sb, struct dentry *root)
87 {
88         int i;
89
90 #ifdef CONFIG_PPC64
91         /*
92          * There is one mmcr0, mmcr1 and mmcra for setting the events for
93          * all of the counters.
94          */
95         oprofilefs_create_ulong(sb, root, "mmcr0", &sys.mmcr0);
96         oprofilefs_create_ulong(sb, root, "mmcr1", &sys.mmcr1);
97         oprofilefs_create_ulong(sb, root, "mmcra", &sys.mmcra);
98 #endif
99
100         for (i = 0; i < model->num_counters; ++i) {
101                 struct dentry *dir;
102                 char buf[4];
103
104                 snprintf(buf, sizeof buf, "%d", i);
105                 dir = oprofilefs_mkdir(sb, root, buf);
106
107                 oprofilefs_create_ulong(sb, dir, "enabled", &ctr[i].enabled);
108                 oprofilefs_create_ulong(sb, dir, "event", &ctr[i].event);
109                 oprofilefs_create_ulong(sb, dir, "count", &ctr[i].count);
110
111                 /*
112                  * Classic PowerPC doesn't support per-counter
113                  * control like this, but the options are
114                  * expected, so they remain.  For Freescale
115                  * Book-E style performance monitors, we do
116                  * support them.
117                  */
118                 oprofilefs_create_ulong(sb, dir, "kernel", &ctr[i].kernel);
119                 oprofilefs_create_ulong(sb, dir, "user", &ctr[i].user);
120
121                 oprofilefs_create_ulong(sb, dir, "unit_mask", &ctr[i].unit_mask);
122         }
123
124         oprofilefs_create_ulong(sb, root, "enable_kernel", &sys.enable_kernel);
125         oprofilefs_create_ulong(sb, root, "enable_user", &sys.enable_user);
126
127         /* Default to tracing both kernel and user */
128         sys.enable_kernel = 1;
129         sys.enable_user = 1;
130
131         return 0;
132 }
133
134 int __init oprofile_arch_init(struct oprofile_operations *ops)
135 {
136         if (!cur_cpu_spec->oprofile_cpu_type)
137                 return -ENODEV;
138
139         if (firmware_has_feature(FW_FEATURE_ISERIES))
140                 return -ENODEV;
141
142         switch (cur_cpu_spec->oprofile_type) {
143 #ifdef CONFIG_PPC64
144                 case PPC_OPROFILE_RS64:
145                         model = &op_model_rs64;
146                         break;
147                 case PPC_OPROFILE_POWER4:
148                         model = &op_model_power4;
149                         break;
150 #endif
151 #ifdef CONFIG_6xx
152                 case PPC_OPROFILE_G4:
153                         model = &op_model_7450;
154                         break;
155 #endif
156 #ifdef CONFIG_FSL_BOOKE
157                 case PPC_OPROFILE_BOOKE:
158                         model = &op_model_fsl_booke;
159                         break;
160 #endif
161                 default:
162                         return -ENODEV;
163         }
164
165         model->num_counters = cur_cpu_spec->num_pmcs;
166
167         ops->cpu_type = cur_cpu_spec->oprofile_cpu_type;
168         ops->create_files = op_powerpc_create_files;
169         ops->setup = op_powerpc_setup;
170         ops->shutdown = op_powerpc_shutdown;
171         ops->start = op_powerpc_start;
172         ops->stop = op_powerpc_stop;
173         ops->backtrace = op_powerpc_backtrace;
174
175         printk(KERN_DEBUG "oprofile: using %s performance monitoring.\n",
176                ops->cpu_type);
177
178         return 0;
179 }
180
181 void oprofile_arch_exit(void)
182 {
183 }