aboutsummaryrefslogtreecommitdiff
path: root/arch/powerpc/oprofile/common.c
blob: af2c05d20ba57aaf3c39e06da889f97ad974c403 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
/*
 * PPC 64 oprofile support:
 * Copyright (C) 2004 Anton Blanchard <anton@au.ibm.com>, IBM
 * PPC 32 oprofile support: (based on PPC 64 support)
 * Copyright (C) Freescale Semiconductor, Inc 2004
 *	Author: Andy Fleming
 *
 * Based on alpha version.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version
 * 2 of the License, or (at your option) any later version.
 */

#include <linux/oprofile.h>
#ifndef __powerpc64__
#include <linux/slab.h>
#endif /* ! __powerpc64__ */
#include <linux/init.h>
#include <linux/smp.h>
#include <linux/errno.h>
#include <asm/ptrace.h>
#include <asm/system.h>
#include <asm/pmc.h>
#include <asm/cputable.h>
#include <asm/oprofile_impl.h>

static struct op_powerpc_model *model;

static struct op_counter_config ctr[OP_MAX_COUNTER];
static struct op_system_config sys;

#ifndef __powerpc64__
static char *cpu_type;
#endif /* ! __powerpc64__ */

static void op_handle_interrupt(struct pt_regs *regs)
{
	model->handle_interrupt(regs, ctr);
}

static int op_powerpc_setup(void)
{
	int err;

	/* Grab the hardware */
	err = reserve_pmc_hardware(op_handle_interrupt);
	if (err)
		return err;

	/* Pre-compute the values to stuff in the hardware registers.  */
	model->reg_setup(ctr, &sys, model->num_counters);

	/* Configure the registers on all cpus.  */
#ifdef __powerpc64__
	on_each_cpu(model->cpu_setup, NULL, 0, 1);
#else /* __powerpc64__ */
#if 0
	/* FIXME: Make multi-cpu work */
	on_each_cpu(model->reg_setup, NULL, 0, 1);
#endif
#endif /* __powerpc64__ */

	return 0;
}

static void op_powerpc_shutdown(void)
{
	release_pmc_hardware();
}

static void op_powerpc_cpu_start(void *dummy)
{
	model->start(ctr);
}

static int op_powerpc_start(void)
{
	on_each_cpu(op_powerpc_cpu_start, NULL, 0, 1);
	return 0;
}

static inline void op_powerpc_cpu_stop(void *dummy)
{
	model->stop();
}

static void op_powerpc_stop(void)
{
	on_each_cpu(op_powerpc_cpu_stop, NULL, 0, 1);
}

static int op_powerpc_create_files(struct super_block *sb, struct dentry *root)
{
	int i;

#ifdef __powerpc64__
	/*
	 * There is one mmcr0, mmcr1 and mmcra for setting the events for
	 * all of the counters.
	 */
	oprofilefs_create_ulong(sb, root, "mmcr0", &sys.mmcr0);
	oprofilefs_create_ulong(sb, root, "mmcr1", &sys.mmcr1);
	oprofilefs_create_ulong(sb, root, "mmcra", &sys.mmcra);
#endif /* __powerpc64__ */

	for (i = 0; i < model->num_counters; ++i) {
		struct dentry *dir;
		char buf[3];

		snprintf(buf, sizeof buf, "%d", i);
		dir = oprofilefs_mkdir(sb, root, buf);

		oprofilefs_create_ulong(sb, dir, "enabled", &ctr[i].enabled);
		oprofilefs_create_ulong(sb, dir, "event", &ctr[i].event);
		oprofilefs_create_ulong(sb, dir, "count", &ctr[i].count);
#ifdef __powerpc64__
		/*
		 * We dont support per counter user/kernel selection, but
		 * we leave the entries because userspace expects them
		 */
#endif /* __powerpc64__ */
		oprofilefs_create_ulong(sb, dir, "kernel", &ctr[i].kernel);
		oprofilefs_create_ulong(sb, dir, "user", &ctr[i].user);

#ifndef __powerpc64__
		/* FIXME: Not sure if this is used */
#endif /* ! __powerpc64__ */
		oprofilefs_create_ulong(sb, dir, "unit_mask", &ctr[i].unit_mask);
	}

	oprofilefs_create_ulong(sb, root, "enable_kernel", &sys.enable_kernel);
	oprofilefs_create_ulong(sb, root, "enable_user", &sys.enable_user);
#ifdef __powerpc64__
	oprofilefs_create_ulong(sb, root, "backtrace_spinlocks",
				&sys.backtrace_spinlocks);
#endif /* __powerpc64__ */

	/* Default to tracing both kernel and user */
	sys.enable_kernel = 1;
	sys.enable_user = 1;
#ifdef __powerpc64__
	/* Turn on backtracing through spinlocks by default */
	sys.backtrace_spinlocks = 1;
#endif /* __powerpc64__ */

	return 0;
}

int __init oprofile_arch_init(struct oprofile_operations *ops)
{
#ifndef __powerpc64__
#ifdef CONFIG_FSL_BOOKE
	model = &op_model_fsl_booke;
#else
	return -ENODEV;
#endif

	cpu_type = kmalloc(32, GFP_KERNEL);
	if (NULL == cpu_type)
		return -ENOMEM;

	sprintf(cpu_type, "ppc/%s", cur_cpu_spec->cpu_name);

	model->num_counters = cur_cpu_spec->num_pmcs;

	ops->cpu_type = cpu_type;
#else /* __powerpc64__ */
	if (!cur_cpu_spec->oprofile_model || !cur_cpu_spec->oprofile_cpu_type)
		return -ENODEV;
	model = cur_cpu_spec->oprofile_model;
	model->num_counters = cur_cpu_spec->num_pmcs;

	ops->cpu_type = cur_cpu_spec->oprofile_cpu_type;
#endif /* __powerpc64__ */
	ops->create_files = op_powerpc_create_files;
	ops->setup = op_powerpc_setup;
	ops->shutdown = op_powerpc_shutdown;
	ops->start = op_powerpc_start;
	ops->stop = op_powerpc_stop;

	printk(KERN_INFO "oprofile: using %s performance monitoring.\n",
	       ops->cpu_type);

	return 0;
}

void oprofile_arch_exit(void)
{
#ifndef __powerpc64__
	kfree(cpu_type);
	cpu_type = NULL;
#endif /* ! __powerpc64__ */
}