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
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
|
/*
* arch/powerpc/oprofile/op_model_7450.c
*
* Freescale 745x/744x oprofile support, based on fsl_booke 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/processor.h>
#include <asm/cputable.h>
#include <asm/page.h>
#include <asm/pmc.h>
#include <asm/oprofile_impl.h>
static unsigned long reset_value[OP_MAX_COUNTER];
static int oprofile_running;
static u32 mmcr0_val, mmcr1_val, mmcr2_val, num_pmcs;
#define MMCR0_PMC1_SHIFT 6
#define MMCR0_PMC2_SHIFT 0
#define MMCR1_PMC3_SHIFT 27
#define MMCR1_PMC4_SHIFT 22
#define MMCR1_PMC5_SHIFT 17
#define MMCR1_PMC6_SHIFT 11
#define mmcr0_event1(event) \
((event << MMCR0_PMC1_SHIFT) & MMCR0_PMC1SEL)
#define mmcr0_event2(event) \
((event << MMCR0_PMC2_SHIFT) & MMCR0_PMC2SEL)
#define mmcr1_event3(event) \
((event << MMCR1_PMC3_SHIFT) & MMCR1_PMC3SEL)
#define mmcr1_event4(event) \
((event << MMCR1_PMC4_SHIFT) & MMCR1_PMC4SEL)
#define mmcr1_event5(event) \
((event << MMCR1_PMC5_SHIFT) & MMCR1_PMC5SEL)
#define mmcr1_event6(event) \
((event << MMCR1_PMC6_SHIFT) & MMCR1_PMC6SEL)
#define MMCR0_INIT (MMCR0_FC | MMCR0_FCS | MMCR0_FCP | MMCR0_FCM1 | MMCR0_FCM0)
/* Unfreezes the counters on this CPU, enables the interrupt,
* enables the counters to trigger the interrupt, and sets the
* counters to only count when the mark bit is not set.
*/
static void pmc_start_ctrs(void)
{
u32 mmcr0 = mfspr(SPRN_MMCR0);
mmcr0 &= ~(MMCR0_FC | MMCR0_FCM0);
mmcr0 |= (MMCR0_FCECE | MMCR0_PMC1CE | MMCR0_PMCnCE | MMCR0_PMXE);
mtspr(SPRN_MMCR0, mmcr0);
}
/* Disables the counters on this CPU, and freezes them */
static void pmc_stop_ctrs(void)
{
u32 mmcr0 = mfspr(SPRN_MMCR0);
mmcr0 |= MMCR0_FC;
mmcr0 &= ~(MMCR0_FCECE | MMCR0_PMC1CE | MMCR0_PMCnCE | MMCR0_PMXE);
mtspr(SPRN_MMCR0, mmcr0);
}
/* Configures the counters on this CPU based on the global
* settings */
static int fsl7450_cpu_setup(struct op_counter_config *ctr)
{
/* freeze all counters */
pmc_stop_ctrs();
mtspr(SPRN_MMCR0, mmcr0_val);
mtspr(SPRN_MMCR1, mmcr1_val);
if (num_pmcs > 4)
mtspr(SPRN_MMCR2, mmcr2_val);
return 0;
}
/* Configures the global settings for the countes on all CPUs. */
static int fsl7450_reg_setup(struct op_counter_config *ctr,
struct op_system_config *sys,
int num_ctrs)
{
int i;
num_pmcs = num_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_ctrs; ++i)
reset_value[i] = 0x80000000UL - ctr[i].count;
/* Set events for Counters 1 & 2 */
mmcr0_val = MMCR0_INIT | mmcr0_event1(ctr[0].event)
| mmcr0_event2(ctr[1].event);
/* Setup user/kernel bits */
if (sys->enable_kernel)
mmcr0_val &= ~(MMCR0_FCS);
if (sys->enable_user)
mmcr0_val &= ~(MMCR0_FCP);
/* Set events for Counters 3-6 */
mmcr1_val = mmcr1_event3(ctr[2].event)
| mmcr1_event4(ctr[3].event);
if (num_ctrs > 4)
mmcr1_val |= mmcr1_event5(ctr[4].event)
| mmcr1_event6(ctr[5].event);
mmcr2_val = 0;
return 0;
}
/* Sets the counters on this CPU to the chosen values, and starts them */
static int fsl7450_start(struct op_counter_config *ctr)
{
int i;
mtmsr(mfmsr() | MSR_PMM);
for (i = 0; i < num_pmcs; ++i) {
if (ctr[i].enabled)
classic_ctr_write(i, reset_value[i]);
else
classic_ctr_write(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();
oprofile_running = 1;
return 0;
}
/* Stop the counters on this CPU */
static void fsl7450_stop(void)
{
/* freeze counters */
pmc_stop_ctrs();
oprofile_running = 0;
mb();
}
/* Handle the interrupt on this CPU, and log a sample for each
* event that triggered the interrupt */
static void fsl7450_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 = mfspr(SPRN_SIAR);
is_kernel = is_kernel_addr(pc);
for (i = 0; i < num_pmcs; ++i) {
val = classic_ctr_read(i);
if (val < 0) {
if (oprofile_running && ctr[i].enabled) {
oprofile_add_ext_sample(pc, regs, i, is_kernel);
classic_ctr_write(i, reset_value[i]);
} else {
classic_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 PM/M bit */
pmc_start_ctrs();
}
struct op_powerpc_model op_model_7450= {
.reg_setup = fsl7450_reg_setup,
.cpu_setup = fsl7450_cpu_setup,
.start = fsl7450_start,
.stop = fsl7450_stop,
.handle_interrupt = fsl7450_handle_interrupt,
};
|
