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Merge branch 'oprofile/x86-oprofile-for-tip' into oprofile/oprofile-for-tip

Browse source 
Conflicts:
	arch/x86/oprofile/op_model_ppro.c
This commit is contained in:
Robert Richter 2008-10-15 22:19:41 +02:00
commit 5a289395bf
3 changed files with 108 additions and 35 deletions
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26
arch/x86/oprofile/nmi_int.c
View file

@ -415,9 +415,6 @@ static int __init ppro_init(char **cpu_type)
case 15: case 23:
*cpu_type = "i386/core_2";
break;
case 26:
*cpu_type = "i386/core_2";
break;
default:
/* Unknown */
return 0;
@ -427,6 +424,16 @@ static int __init ppro_init(char **cpu_type)
return 1;
}
static int __init arch_perfmon_init(char **cpu_type)
{
if (!cpu_has_arch_perfmon)
return 0;
*cpu_type = "i386/arch_perfmon";
model = &op_arch_perfmon_spec;
arch_perfmon_setup_counters();
return 1;
}
/* in order to get sysfs right */
static int using_nmi;
@ -434,7 +441,7 @@ int __init op_nmi_init(struct oprofile_operations *ops)
{
__u8 vendor = boot_cpu_data.x86_vendor;
__u8 family = boot_cpu_data.x86;
char *cpu_type;
char *cpu_type = NULL;
int ret = 0;
if (!cpu_has_apic)
@ -472,19 +479,20 @@ int __init op_nmi_init(struct oprofile_operations *ops)
switch (family) {
/* Pentium IV */
case 0xf:
if (!p4_init(&cpu_type))
return -ENODEV;
p4_init(&cpu_type);
break;
/* A P6-class processor */
case 6:
if (!ppro_init(&cpu_type))
return -ENODEV;
ppro_init(&cpu_type);
break;
default:
return -ENODEV;
break;
}
if (!cpu_type && !arch_perfmon_init(&cpu_type))
return -ENODEV;
break;
default:

108
arch/x86/oprofile/op_model_ppro.c
View file

@ -1,32 +1,34 @@
/*
* @file op_model_ppro.h
* pentium pro / P6 model-specific MSR operations
* Family 6 perfmon and architectural perfmon MSR operations
*
* @remark Copyright 2002 OProfile authors
* @remark Copyright 2008 Intel Corporation
* @remark Read the file COPYING
*
* @author John Levon
* @author Philippe Elie
* @author Graydon Hoare
* @author Andi Kleen
*/
#include <linux/oprofile.h>
#include <linux/slab.h>
#include <asm/ptrace.h>
#include <asm/msr.h>
#include <asm/apic.h>
#include <asm/nmi.h>
#include <asm/intel_arch_perfmon.h>
#include "op_x86_model.h"
#include "op_counter.h"
#define NUM_COUNTERS 2
#define NUM_CONTROLS 2
static int num_counters = 2;
static int counter_width = 32;
#define CTR_IS_RESERVED(msrs, c) (msrs->counters[(c)].addr ? 1 : 0)
#define CTR_READ(l, h, msrs, c) do {rdmsr(msrs->counters[(c)].addr, (l), (h)); } while (0)
#define CTR_32BIT_WRITE(l, msrs, c) \
do {wrmsr(msrs->counters[(c)].addr, -(u32)(l), 0); } while (0)
#define CTR_OVERFLOWED(n) (!((n) & (1U<<31)))
#define CTR_OVERFLOWED(n) (!((n) & (1U<<(counter_width-1))))
#define CTRL_IS_RESERVED(msrs, c) (msrs->controls[(c)].addr ? 1 : 0)
#define CTRL_READ(l, h, msrs, c) do {rdmsr((msrs->controls[(c)].addr), (l), (h)); } while (0)
@ -40,20 +42,20 @@
#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 u64 *reset_value;
static void ppro_fill_in_addresses(struct op_msrs * const msrs)
{
int i;
for (i = 0; i < NUM_COUNTERS; i++) {
for (i = 0; i < num_counters; i++) {
if (reserve_perfctr_nmi(MSR_P6_PERFCTR0 + i))
msrs->counters[i].addr = MSR_P6_PERFCTR0 + i;
else
msrs->counters[i].addr = 0;
}
for (i = 0; i < NUM_CONTROLS; i++) {
for (i = 0; i < num_counters; i++) {
if (reserve_evntsel_nmi(MSR_P6_EVNTSEL0 + i))
msrs->controls[i].addr = MSR_P6_EVNTSEL0 + i;
else
@ -67,8 +69,22 @@ static void ppro_setup_ctrs(struct op_msrs const * const msrs)
unsigned int low, high;
int i;
if (!reset_value) {
reset_value = kmalloc(sizeof(unsigned) * num_counters,
GFP_ATOMIC);
if (!reset_value)
return;
}
if (cpu_has_arch_perfmon) {
union cpuid10_eax eax;
eax.full = cpuid_eax(0xa);
if (counter_width < eax.split.bit_width)
counter_width = eax.split.bit_width;
}
/* clear all counters */
for (i = 0 ; i < NUM_CONTROLS; ++i) {
for (i = 0 ; i < num_counters; ++i) {
if (unlikely(!CTRL_IS_RESERVED(msrs, i)))
continue;
CTRL_READ(low, high, msrs, i);
@ -77,18 +93,18 @@ static void ppro_setup_ctrs(struct op_msrs const * const msrs)
}
/* avoid a false detection of ctr overflows in NMI handler */
for (i = 0; i < NUM_COUNTERS; ++i) {
for (i = 0; i < num_counters; ++i) {
if (unlikely(!CTR_IS_RESERVED(msrs, i)))
continue;
CTR_32BIT_WRITE(1, msrs, i);
wrmsrl(msrs->counters[i].addr, -1LL);
}
/* enable active counters */
for (i = 0; i < NUM_COUNTERS; ++i) {
for (i = 0; i < num_counters; ++i) {
if ((counter_config[i].enabled) && (CTR_IS_RESERVED(msrs, i))) {
reset_value[i] = counter_config[i].count;
CTR_32BIT_WRITE(counter_config[i].count, msrs, i);
wrmsrl(msrs->counters[i].addr, -reset_value[i]);
CTRL_READ(low, high, msrs, i);
CTRL_CLEAR(low);
@ -111,13 +127,13 @@ static int ppro_check_ctrs(struct pt_regs * const regs,
unsigned int low, high;
int i;
for (i = 0 ; i < NUM_COUNTERS; ++i) {
for (i = 0 ; i < num_counters; ++i) {
if (!reset_value[i])
continue;
CTR_READ(low, high, msrs, i);
if (CTR_OVERFLOWED(low)) {
oprofile_add_sample(regs, i);
CTR_32BIT_WRITE(reset_value[i], msrs, i);
wrmsrl(msrs->counters[i].addr, -reset_value[i]);
}
}
@ -141,7 +157,7 @@ static void ppro_start(struct op_msrs const * const msrs)
unsigned int low, high;
int i;
for (i = 0; i < NUM_COUNTERS; ++i) {
for (i = 0; i < num_counters; ++i) {
if (reset_value[i]) {
CTRL_READ(low, high, msrs, i);
CTRL_SET_ACTIVE(low);
@ -156,7 +172,7 @@ static void ppro_stop(struct op_msrs const * const msrs)
unsigned int low, high;
int i;
for (i = 0; i < NUM_COUNTERS; ++i) {
for (i = 0; i < num_counters; ++i) {
if (!reset_value[i])
continue;
CTRL_READ(low, high, msrs, i);
@ -169,20 +185,24 @@ static void ppro_shutdown(struct op_msrs const * const msrs)
{
int i;
for (i = 0 ; i < NUM_COUNTERS ; ++i) {
for (i = 0 ; i < num_counters ; ++i) {
if (CTR_IS_RESERVED(msrs, i))
release_perfctr_nmi(MSR_P6_PERFCTR0 + i);
}
for (i = 0 ; i < NUM_CONTROLS ; ++i) {
for (i = 0 ; i < num_counters ; ++i) {
if (CTRL_IS_RESERVED(msrs, i))
release_evntsel_nmi(MSR_P6_EVNTSEL0 + i);
}
if (reset_value) {
kfree(reset_value);
reset_value = NULL;
}
}
struct op_x86_model_spec const op_ppro_spec = {
.num_counters = NUM_COUNTERS,
.num_controls = NUM_CONTROLS,
struct op_x86_model_spec op_ppro_spec = {
.num_counters = 2, /* can be overriden */
.num_controls = 2, /* dito */
.fill_in_addresses = &ppro_fill_in_addresses,
.setup_ctrs = &ppro_setup_ctrs,
.check_ctrs = &ppro_check_ctrs,
@ -190,3 +210,45 @@ struct op_x86_model_spec const op_ppro_spec = {
.stop = &ppro_stop,
.shutdown = &ppro_shutdown
};
/*
* Architectural performance monitoring.
*
* Newer Intel CPUs (Core1+) have support for architectural
* events described in CPUID 0xA. See the IA32 SDM Vol3b.18 for details.
* The advantage of this is that it can be done without knowing about
* the specific CPU.
*/
void arch_perfmon_setup_counters(void)
{
union cpuid10_eax eax;
eax.full = cpuid_eax(0xa);
/* Workaround for BIOS bugs in 6/15. Taken from perfmon2 */
if (eax.split.version_id == 0 && current_cpu_data.x86 == 6 &&
current_cpu_data.x86_model == 15) {
eax.split.version_id = 2;
eax.split.num_counters = 2;
eax.split.bit_width = 40;
}
num_counters = eax.split.num_counters;
op_arch_perfmon_spec.num_counters = num_counters;
op_arch_perfmon_spec.num_controls = num_counters;
op_ppro_spec.num_counters = num_counters;
op_ppro_spec.num_controls = num_counters;
}
struct op_x86_model_spec op_arch_perfmon_spec = {
/* num_counters/num_controls filled in at runtime */
.fill_in_addresses = &ppro_fill_in_addresses,
/* user space does the cpuid check for available events */
.setup_ctrs = &ppro_setup_ctrs,
.check_ctrs = &ppro_check_ctrs,
.start = &ppro_start,
.stop = &ppro_stop,
.shutdown = &ppro_shutdown
};

9
arch/x86/oprofile/op_x86_model.h
View file

@ -34,8 +34,8 @@ struct pt_regs;
struct op_x86_model_spec {
int (*init)(struct oprofile_operations *ops);
void (*exit)(void);
unsigned int const num_counters;
unsigned int const num_controls;
unsigned int num_counters;
unsigned int num_controls;
void (*fill_in_addresses)(struct op_msrs * const msrs);
void (*setup_ctrs)(struct op_msrs const * const msrs);
int (*check_ctrs)(struct pt_regs * const regs,
@ -45,9 +45,12 @@ struct op_x86_model_spec {
void (*shutdown)(struct op_msrs const * const msrs);
};
extern struct op_x86_model_spec const op_ppro_spec;
extern struct op_x86_model_spec op_ppro_spec;
extern struct op_x86_model_spec const op_p4_spec;
extern struct op_x86_model_spec const op_p4_ht2_spec;
extern struct op_x86_model_spec const op_amd_spec;
extern struct op_x86_model_spec op_arch_perfmon_spec;
extern void arch_perfmon_setup_counters(void);
#endif /* OP_X86_MODEL_H */