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-rw-r--r--arch/Kconfig4
-rw-r--r--arch/x86/oprofile/Makefile3
-rw-r--r--arch/x86/oprofile/init.c25
-rw-r--r--arch/x86/oprofile/nmi_int.c27
-rw-r--r--arch/x86/oprofile/nmi_timer_int.c50
5 files changed, 33 insertions, 76 deletions
diff --git a/arch/Kconfig b/arch/Kconfig
index 4b0669cbb3b0..2505740b81d2 100644
--- a/arch/Kconfig
+++ b/arch/Kconfig
@@ -30,6 +30,10 @@ config OPROFILE_EVENT_MULTIPLEX
config HAVE_OPROFILE
bool
+config OPROFILE_NMI_TIMER
+ def_bool y
+ depends on PERF_EVENTS && HAVE_PERF_EVENTS_NMI
+
config KPROBES
bool "Kprobes"
depends on MODULES
diff --git a/arch/x86/oprofile/Makefile b/arch/x86/oprofile/Makefile
index 446902b2a6b6..1599f568f0e2 100644
--- a/arch/x86/oprofile/Makefile
+++ b/arch/x86/oprofile/Makefile
@@ -4,9 +4,8 @@ DRIVER_OBJS = $(addprefix ../../../drivers/oprofile/, \
oprof.o cpu_buffer.o buffer_sync.o \
event_buffer.o oprofile_files.o \
oprofilefs.o oprofile_stats.o \
- timer_int.o )
+ timer_int.o nmi_timer_int.o )
oprofile-y := $(DRIVER_OBJS) init.o backtrace.o
oprofile-$(CONFIG_X86_LOCAL_APIC) += nmi_int.o op_model_amd.o \
op_model_ppro.o op_model_p4.o
-oprofile-$(CONFIG_X86_IO_APIC) += nmi_timer_int.o
diff --git a/arch/x86/oprofile/init.c b/arch/x86/oprofile/init.c
index cdfe4c54deca..9e138d00ad36 100644
--- a/arch/x86/oprofile/init.c
+++ b/arch/x86/oprofile/init.c
@@ -16,34 +16,23 @@
* with the NMI mode driver.
*/
+#ifdef CONFIG_X86_LOCAL_APIC
extern int op_nmi_init(struct oprofile_operations *ops);
-extern int op_nmi_timer_init(struct oprofile_operations *ops);
extern void op_nmi_exit(void);
-extern void x86_backtrace(struct pt_regs * const regs, unsigned int depth);
+#else
+static int op_nmi_init(struct oprofile_operations *ops) { return -ENODEV; }
+static void op_nmi_exit(void) { }
+#endif
+extern void x86_backtrace(struct pt_regs * const regs, unsigned int depth);
int __init oprofile_arch_init(struct oprofile_operations *ops)
{
- int ret;
-
- ret = -ENODEV;
-
-#ifdef CONFIG_X86_LOCAL_APIC
- ret = op_nmi_init(ops);
-#endif
-#ifdef CONFIG_X86_IO_APIC
- if (ret < 0)
- ret = op_nmi_timer_init(ops);
-#endif
ops->backtrace = x86_backtrace;
-
- return ret;
+ return op_nmi_init(ops);
}
-
void oprofile_arch_exit(void)
{
-#ifdef CONFIG_X86_LOCAL_APIC
op_nmi_exit();
-#endif
}
diff --git a/arch/x86/oprofile/nmi_int.c b/arch/x86/oprofile/nmi_int.c
index 75f9528e0372..26b8a8514ee5 100644
--- a/arch/x86/oprofile/nmi_int.c
+++ b/arch/x86/oprofile/nmi_int.c
@@ -595,24 +595,36 @@ static int __init p4_init(char **cpu_type)
return 0;
}
-static int force_arch_perfmon;
-static int force_cpu_type(const char *str, struct kernel_param *kp)
+enum __force_cpu_type {
+ reserved = 0, /* do not force */
+ timer,
+ arch_perfmon,
+};
+
+static int force_cpu_type;
+
+static int set_cpu_type(const char *str, struct kernel_param *kp)
{
- if (!strcmp(str, "arch_perfmon")) {
- force_arch_perfmon = 1;
+ if (!strcmp(str, "timer")) {
+ force_cpu_type = timer;
+ printk(KERN_INFO "oprofile: forcing NMI timer mode\n");
+ } else if (!strcmp(str, "arch_perfmon")) {
+ force_cpu_type = arch_perfmon;
printk(KERN_INFO "oprofile: forcing architectural perfmon\n");
+ } else {
+ force_cpu_type = 0;
}
return 0;
}
-module_param_call(cpu_type, force_cpu_type, NULL, NULL, 0);
+module_param_call(cpu_type, set_cpu_type, NULL, NULL, 0);
static int __init ppro_init(char **cpu_type)
{
__u8 cpu_model = boot_cpu_data.x86_model;
struct op_x86_model_spec *spec = &op_ppro_spec; /* default */
- if (force_arch_perfmon && cpu_has_arch_perfmon)
+ if (force_cpu_type == arch_perfmon && cpu_has_arch_perfmon)
return 0;
/*
@@ -679,6 +691,9 @@ int __init op_nmi_init(struct oprofile_operations *ops)
if (!cpu_has_apic)
return -ENODEV;
+ if (force_cpu_type == timer)
+ return -ENODEV;
+
switch (vendor) {
case X86_VENDOR_AMD:
/* Needs to be at least an Athlon (or hammer in 32bit mode) */
diff --git a/arch/x86/oprofile/nmi_timer_int.c b/arch/x86/oprofile/nmi_timer_int.c
deleted file mode 100644
index 7f8052cd6620..000000000000
--- a/arch/x86/oprofile/nmi_timer_int.c
+++ /dev/null
@@ -1,50 +0,0 @@
-/**
- * @file nmi_timer_int.c
- *
- * @remark Copyright 2003 OProfile authors
- * @remark Read the file COPYING
- *
- * @author Zwane Mwaikambo <zwane@linuxpower.ca>
- */
-
-#include <linux/init.h>
-#include <linux/smp.h>
-#include <linux/errno.h>
-#include <linux/oprofile.h>
-#include <linux/rcupdate.h>
-#include <linux/kdebug.h>
-
-#include <asm/nmi.h>
-#include <asm/apic.h>
-#include <asm/ptrace.h>
-
-static int profile_timer_exceptions_notify(unsigned int val, struct pt_regs *regs)
-{
- oprofile_add_sample(regs, 0);
- return NMI_HANDLED;
-}
-
-static int timer_start(void)
-{
- if (register_nmi_handler(NMI_LOCAL, profile_timer_exceptions_notify,
- 0, "oprofile-timer"))
- return 1;
- return 0;
-}
-
-
-static void timer_stop(void)
-{
- unregister_nmi_handler(NMI_LOCAL, "oprofile-timer");
- synchronize_sched(); /* Allow already-started NMIs to complete. */
-}
-
-
-int __init op_nmi_timer_init(struct oprofile_operations *ops)
-{
- ops->start = timer_start;
- ops->stop = timer_stop;
- ops->cpu_type = "timer";
- printk(KERN_INFO "oprofile: using NMI timer interrupt.\n");
- return 0;
-}
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