aboutsummaryrefslogtreecommitdiff
path: root/arch/powerpc/oprofile/op_model_fsl_booke.c
blob: e29dede31423e0275b4aaa6818bf53b2aa831c11 (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
/*
 * arch/powerpc/oprofile/op_model_fsl_booke.c
 *
 * Freescale Book-E oprofile support, based on ppc64 oprofile support
 * Copyright (C) 2004 Anton Blanchard <anton@au.ibm.com>, IBM
 *
 * Copyright (c) 2004 Freescale Semiconductor, Inc
 *
 * Author: Andy Fleming
 * Maintainer: Kumar Gala <galak@kernel.crashing.org>
 *
 * 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>
#include <linux/init.h>
#include <linux/smp.h>
#include <asm/ptrace.h>
#include <asm/system.h>
#include <asm/processor.h>
#include <asm/cputable.h>
#include <asm/reg_booke.h>
#include <asm/page.h>
#include <asm/pmc.h>
#include <asm/oprofile_impl.h>

static unsigned long reset_value[OP_MAX_COUNTER];

static int num_counters;
static int oprofile_running;

static inline unsigned int ctr_read(unsigned int i)
{
	switch(i) {
		case 0:
			return mfpmr(PMRN_PMC0);
		case 1:
			return mfpmr(PMRN_PMC1);
		case 2:
			return mfpmr(PMRN_PMC2);
		case 3:
			return mfpmr(PMRN_PMC3);
		default:
			return 0;
	}
}

static inline void ctr_write(unsigned int i, unsigned int val)
{
	switch(i) {
		case 0:
			mtpmr(PMRN_PMC0, val);
			break;
		case 1:
			mtpmr(PMRN_PMC1, val);
			break;
		case 2:
			mtpmr(PMRN_PMC2, val);
			break;
		case 3:
			mtpmr(PMRN_PMC3, val);
			break;
		default:
			break;
	}
}


static void fsl_booke_reg_setup(struct op_counter_config *ctr,
			     struct op_system_config *sys,
			     int num_ctrs)
{
	int i;

	num_counters = num_ctrs;

	/* freeze all counters */
	pmc_stop_ctrs();

	/* Our counters count up, and "count" refers to
	 * how much before the next interrupt, and we interrupt
	 * on overflow.  So we calculate the starting value
	 * which will give us "count" until overflow.
	 * Then we set the events on the enabled counters */
	for (i = 0; i < num_counters; ++i) {
		reset_value[i] = 0x80000000UL - ctr[i].count;

		init_pmc_stop(i);

		set_pmc_event(i, ctr[i].event);

		set_pmc_user_kernel(i, ctr[i].user, ctr[i].kernel);
	}
}

static void fsl_booke_start(struct op_counter_config *ctr)
{
	int i;

	mtmsr(mfmsr() | MSR_PMM);

	for (i = 0; i < num_counters; ++i) {
		if (ctr[i].enabled) {
			ctr_write(i, reset_value[i]);
			/* Set Each enabled counterd to only
			 * count when the Mark bit is not set */
			set_pmc_marked(i, 1, 0);
			pmc_start_ctr(i, 1);
		} else {
			ctr_write(i, 0);

			/* Set the ctr to be stopped */
			pmc_start_ctr(i, 0);
		}
	}

	/* Clear the freeze bit, and enable the interrupt.
	 * The counters won't actually start until the rfi clears
	 * the PMM bit */
	pmc_start_ctrs(1);

	oprofile_running = 1;

	pr_debug("start on cpu %d, pmgc0 %x\n", smp_processor_id(),
			mfpmr(PMRN_PMGC0));
}

static void fsl_booke_stop(void)
{
	/* freeze counters */
	pmc_stop_ctrs();

	oprofile_running = 0;

	pr_debug("stop on cpu %d, pmgc0 %x\n", smp_processor_id(),
			mfpmr(PMRN_PMGC0));

	mb();
}


static void fsl_booke_handle_interrupt(struct pt_regs *regs,
				    struct op_counter_config *ctr)
{
	unsigned long pc;
	int is_kernel;
	int val;
	int i;

	/* set the PMM bit (see comment below) */
	mtmsr(mfmsr() | MSR_PMM);

	pc = regs->nip;
	is_kernel = is_kernel_addr(pc);

	for (i = 0; i < num_counters; ++i) {
		val = ctr_read(i);
		if (val < 0) {
			if (oprofile_running && ctr[i].enabled) {
				oprofile_add_ext_sample(pc, regs, i, is_kernel);
				ctr_write(i, reset_value[i]);
			} else {
				ctr_write(i, 0);
			}
		}
	}

	/* The freeze bit was set by the interrupt. */
	/* Clear the freeze bit, and reenable the interrupt.
	 * The counters won't actually start until the rfi clears
	 * the PMM bit */
	pmc_start_ctrs(1);
}

struct op_powerpc_model op_model_fsl_booke = {
	.reg_setup		= fsl_booke_reg_setup,
	.start			= fsl_booke_start,
	.stop			= fsl_booke_stop,
	.handle_interrupt	= fsl_booke_handle_interrupt,
};