summaryrefslogtreecommitdiff
path: root/arch/i386/oprofile/op_model_ppro.c
blob: 5c3ab4b027ade11f9a32973c5e32df85af9abeeb (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
/**
 * @file op_model_ppro.h
 * pentium pro / P6 model-specific MSR operations
 *
 * @remark Copyright 2002 OProfile authors
 * @remark Read the file COPYING
 *
 * @author John Levon
 * @author Philippe Elie
 * @author Graydon Hoare
 */

#include <linux/oprofile.h>
#include <asm/ptrace.h>
#include <asm/msr.h>
#include <asm/apic.h>
#include <asm/nmi.h>
 
#include "op_x86_model.h"
#include "op_counter.h"

#define NUM_COUNTERS 2
#define NUM_CONTROLS 2

#define CTR_READ(l,h,msrs,c) do {rdmsr(msrs->counters[(c)].addr, (l), (h));} while (0)
#define CTR_WRITE(l,msrs,c) do {wrmsr(msrs->counters[(c)].addr, -(u32)(l), -1);} while (0)
#define CTR_OVERFLOWED(n) (!((n) & (1U<<31)))

#define CTRL_READ(l,h,msrs,c) do {rdmsr((msrs->controls[(c)].addr), (l), (h));} while (0)
#define CTRL_WRITE(l,h,msrs,c) do {wrmsr((msrs->controls[(c)].addr), (l), (h));} while (0)
#define CTRL_SET_ACTIVE(n) (n |= (1<<22))
#define CTRL_SET_INACTIVE(n) (n &= ~(1<<22))
#define CTRL_CLEAR(x) (x &= (1<<21))
#define CTRL_SET_ENABLE(val) (val |= 1<<20)
#define CTRL_SET_USR(val,u) (val |= ((u & 1) << 16))
#define CTRL_SET_KERN(val,k) (val |= ((k & 1) << 17))
#define CTRL_SET_UM(val, m) (val |= (m << 8))
#define CTRL_SET_EVENT(val, e) (val |= e)

static unsigned long reset_value[NUM_COUNTERS];
 
static void ppro_fill_in_addresses(struct op_msrs * const msrs)
{
	msrs->counters[0].addr = MSR_P6_PERFCTR0;
	msrs->counters[1].addr = MSR_P6_PERFCTR1;
	
	msrs->controls[0].addr = MSR_P6_EVNTSEL0;
	msrs->controls[1].addr = MSR_P6_EVNTSEL1;
}


static void ppro_setup_ctrs(struct op_msrs const * const msrs)
{
	unsigned int low, high;
	int i;

	/* clear all counters */
	for (i = 0 ; i < NUM_CONTROLS; ++i) {
		CTRL_READ(low, high, msrs, i);
		CTRL_CLEAR(low);
		CTRL_WRITE(low, high, msrs, i);
	}
	
	/* avoid a false detection of ctr overflows in NMI handler */
	for (i = 0; i < NUM_COUNTERS; ++i) {
		CTR_WRITE(1, msrs, i);
	}

	/* enable active counters */
	for (i = 0; i < NUM_COUNTERS; ++i) {
		if (counter_config[i].enabled) {
			reset_value[i] = counter_config[i].count;

			CTR_WRITE(counter_config[i].count, msrs, i);

			CTRL_READ(low, high, msrs, i);
			CTRL_CLEAR(low);
			CTRL_SET_ENABLE(low);
			CTRL_SET_USR(low, counter_config[i].user);
			CTRL_SET_KERN(low, counter_config[i].kernel);
			CTRL_SET_UM(low, counter_config[i].unit_mask);
			CTRL_SET_EVENT(low, counter_config[i].event);
			CTRL_WRITE(low, high, msrs, i);
		}
	}
}

 
static int ppro_check_ctrs(struct pt_regs * const regs,
			   struct op_msrs const * const msrs)
{
	unsigned int low, high;
	int i;
 
	for (i = 0 ; i < NUM_COUNTERS; ++i) {
		CTR_READ(low, high, msrs, i);
		if (CTR_OVERFLOWED(low)) {
			oprofile_add_sample(regs, i);
			CTR_WRITE(reset_value[i], msrs, i);
		}
	}

	/* Only P6 based Pentium M need to re-unmask the apic vector but it
	 * doesn't hurt other P6 variant */
	apic_write(APIC_LVTPC, apic_read(APIC_LVTPC) & ~APIC_LVT_MASKED);

	/* We can't work out if we really handled an interrupt. We
	 * might have caught a *second* counter just after overflowing
	 * the interrupt for this counter then arrives
	 * and we don't find a counter that's overflowed, so we
	 * would return 0 and get dazed + confused. Instead we always
	 * assume we found an overflow. This sucks.
	 */
	return 1;
}

 
static void ppro_start(struct op_msrs const * const msrs)
{
	unsigned int low,high;
	CTRL_READ(low, high, msrs, 0);
	CTRL_SET_ACTIVE(low);
	CTRL_WRITE(low, high, msrs, 0);
}


static void ppro_stop(struct op_msrs const * const msrs)
{
	unsigned int low,high;
	CTRL_READ(low, high, msrs, 0);
	CTRL_SET_INACTIVE(low);
	CTRL_WRITE(low, high, msrs, 0);
}


struct op_x86_model_spec const op_ppro_spec = {
	.num_counters = NUM_COUNTERS,
	.num_controls = NUM_CONTROLS,
	.fill_in_addresses = &ppro_fill_in_addresses,
	.setup_ctrs = &ppro_setup_ctrs,
	.check_ctrs = &ppro_check_ctrs,
	.start = &ppro_start,
	.stop = &ppro_stop
};