2 * @file op_model_athlon.h
3 * athlon / K7 model-specific MSR operations
5 * @remark Copyright 2002 OProfile authors
6 * @remark Read the file COPYING
9 * @author Philippe Elie
10 * @author Graydon Hoare
13 #include <linux/oprofile.h>
14 #include <asm/ptrace.h>
18 #include "op_x86_model.h"
19 #include "op_counter.h"
21 #define NUM_COUNTERS 4
22 #define NUM_CONTROLS 4
24 #define CTR_READ(l,h,msrs,c) do {rdmsr(msrs->counters[(c)].addr, (l), (h));} while (0)
25 #define CTR_WRITE(l,msrs,c) do {wrmsr(msrs->counters[(c)].addr, -(unsigned int)(l), -1);} while (0)
26 #define CTR_OVERFLOWED(n) (!((n) & (1U<<31)))
28 #define CTRL_READ(l,h,msrs,c) do {rdmsr(msrs->controls[(c)].addr, (l), (h));} while (0)
29 #define CTRL_WRITE(l,h,msrs,c) do {wrmsr(msrs->controls[(c)].addr, (l), (h));} while (0)
30 #define CTRL_SET_ACTIVE(n) (n |= (1<<22))
31 #define CTRL_SET_INACTIVE(n) (n &= ~(1<<22))
32 #define CTRL_CLEAR(x) (x &= (1<<21))
33 #define CTRL_SET_ENABLE(val) (val |= 1<<20)
34 #define CTRL_SET_USR(val,u) (val |= ((u & 1) << 16))
35 #define CTRL_SET_KERN(val,k) (val |= ((k & 1) << 17))
36 #define CTRL_SET_UM(val, m) (val |= (m << 8))
37 #define CTRL_SET_EVENT(val, e) (val |= e)
39 static unsigned long reset_value[NUM_COUNTERS];
41 static void athlon_fill_in_addresses(struct op_msrs * const msrs)
43 msrs->counters[0].addr = MSR_K7_PERFCTR0;
44 msrs->counters[1].addr = MSR_K7_PERFCTR1;
45 msrs->counters[2].addr = MSR_K7_PERFCTR2;
46 msrs->counters[3].addr = MSR_K7_PERFCTR3;
48 msrs->controls[0].addr = MSR_K7_EVNTSEL0;
49 msrs->controls[1].addr = MSR_K7_EVNTSEL1;
50 msrs->controls[2].addr = MSR_K7_EVNTSEL2;
51 msrs->controls[3].addr = MSR_K7_EVNTSEL3;
55 static void athlon_setup_ctrs(struct op_msrs const * const msrs)
57 unsigned int low, high;
60 /* clear all counters */
61 for (i = 0 ; i < NUM_CONTROLS; ++i) {
62 CTRL_READ(low, high, msrs, i);
64 CTRL_WRITE(low, high, msrs, i);
67 /* avoid a false detection of ctr overflows in NMI handler */
68 for (i = 0; i < NUM_COUNTERS; ++i) {
69 CTR_WRITE(1, msrs, i);
72 /* enable active counters */
73 for (i = 0; i < NUM_COUNTERS; ++i) {
74 if (counter_config[i].enabled) {
75 reset_value[i] = counter_config[i].count;
77 CTR_WRITE(counter_config[i].count, msrs, i);
79 CTRL_READ(low, high, msrs, i);
82 CTRL_SET_USR(low, counter_config[i].user);
83 CTRL_SET_KERN(low, counter_config[i].kernel);
84 CTRL_SET_UM(low, counter_config[i].unit_mask);
85 CTRL_SET_EVENT(low, counter_config[i].event);
86 CTRL_WRITE(low, high, msrs, i);
94 static int athlon_check_ctrs(struct pt_regs * const regs,
95 struct op_msrs const * const msrs)
97 unsigned int low, high;
100 for (i = 0 ; i < NUM_COUNTERS; ++i) {
101 CTR_READ(low, high, msrs, i);
102 if (CTR_OVERFLOWED(low)) {
103 oprofile_add_sample(regs, i);
104 CTR_WRITE(reset_value[i], msrs, i);
108 /* See op_model_ppro.c */
113 static void athlon_start(struct op_msrs const * const msrs)
115 unsigned int low, high;
117 for (i = 0 ; i < NUM_COUNTERS ; ++i) {
118 if (reset_value[i]) {
119 CTRL_READ(low, high, msrs, i);
120 CTRL_SET_ACTIVE(low);
121 CTRL_WRITE(low, high, msrs, i);
127 static void athlon_stop(struct op_msrs const * const msrs)
129 unsigned int low,high;
132 /* Subtle: stop on all counters to avoid race with
133 * setting our pm callback */
134 for (i = 0 ; i < NUM_COUNTERS ; ++i) {
135 CTRL_READ(low, high, msrs, i);
136 CTRL_SET_INACTIVE(low);
137 CTRL_WRITE(low, high, msrs, i);
142 struct op_x86_model_spec const op_athlon_spec = {
143 .num_counters = NUM_COUNTERS,
144 .num_controls = NUM_CONTROLS,
145 .fill_in_addresses = &athlon_fill_in_addresses,
146 .setup_ctrs = &athlon_setup_ctrs,
147 .check_ctrs = &athlon_check_ctrs,
148 .start = &athlon_start,