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Subject[PATCH 15/23] x86/oprofile: replace macros to calculate control register
Date
This patch introduces op_x86_get_ctrl() to calculate the value of the
performance control register. This is generic code usable for all
models. The event and reserved masks are model specific and stored in
struct op_x86_model_spec. 64 bit MSR functions are used now. The patch
removes many hard to read macros used for ctrl calculation.

The function op_x86_get_ctrl() is common code and the first step to
further merge performance counter implementations for x86 models.

Signed-off-by: Robert Richter <robert.richter@amd.com>
---
arch/x86/oprofile/nmi_int.c | 20 ++++++++++++++++++
arch/x86/oprofile/op_model_amd.c | 41 ++++++++++++++----------------------
arch/x86/oprofile/op_model_ppro.c | 29 +++++++++++--------------
arch/x86/oprofile/op_x86_model.h | 15 ++++++++++---
4 files changed, 60 insertions(+), 45 deletions(-)
diff --git a/arch/x86/oprofile/nmi_int.c b/arch/x86/oprofile/nmi_int.c
index c31f87b..388ee15 100644
--- a/arch/x86/oprofile/nmi_int.c
+++ b/arch/x86/oprofile/nmi_int.c
@@ -31,6 +31,26 @@ static DEFINE_PER_CPU(unsigned long, saved_lvtpc);
/* 0 == registered but off, 1 == registered and on */
static int nmi_enabled = 0;

+/* common functions */
+
+u64 op_x86_get_ctrl(struct op_x86_model_spec const *model,
+ struct op_counter_config *counter_config)
+{
+ u64 val = 0;
+ u16 event = (u16)counter_config->event;
+
+ val |= ARCH_PERFMON_EVENTSEL_INT;
+ val |= counter_config->user ? ARCH_PERFMON_EVENTSEL_USR : 0;
+ val |= counter_config->kernel ? ARCH_PERFMON_EVENTSEL_OS : 0;
+ val |= (counter_config->unit_mask & 0xFF) << 8;
+ event &= model->event_mask ? model->event_mask : 0xFF;
+ val |= event & 0xFF;
+ val |= (event & 0x0F00) << 24;
+
+ return val;
+}
+
+
static int profile_exceptions_notify(struct notifier_block *self,
unsigned long val, void *data)
{
diff --git a/arch/x86/oprofile/op_model_amd.c b/arch/x86/oprofile/op_model_amd.c
index 86e0a01..2406ab8 100644
--- a/arch/x86/oprofile/op_model_amd.c
+++ b/arch/x86/oprofile/op_model_amd.c
@@ -25,12 +25,11 @@

#define NUM_COUNTERS 4
#define NUM_CONTROLS 4
+#define OP_EVENT_MASK 0x0FFF
+
+#define MSR_AMD_EVENTSEL_RESERVED ((0xFFFFFCF0ULL<<32)|(1ULL<<21))

#define CTR_OVERFLOWED(n) (!((n) & (1U<<31)))
-#define CTRL_CLEAR_LO(x) (x &= (1<<21))
-#define CTRL_CLEAR_HI(x) (x &= 0xfffffcf0)
-#define CTRL_SET_EVENT_LOW(val, e) (val |= (e & 0xff))
-#define CTRL_SET_EVENT_HIGH(val, e) (val |= ((e >> 8) & 0xf))

static unsigned long reset_value[NUM_COUNTERS];

@@ -84,21 +83,19 @@ static void op_amd_fill_in_addresses(struct op_msrs * const msrs)
}
}

-
static void op_amd_setup_ctrs(struct op_x86_model_spec const *model,
struct op_msrs const * const msrs)
{
- unsigned int low, high;
+ u64 val;
int i;

/* clear all counters */
for (i = 0 ; i < NUM_CONTROLS; ++i) {
if (unlikely(!CTRL_IS_RESERVED(msrs, i)))
continue;
- rdmsr(msrs->controls[i].addr, low, high);
- CTRL_CLEAR_LO(low);
- CTRL_CLEAR_HI(high);
- wrmsr(msrs->controls[i].addr, low, high);
+ rdmsrl(msrs->controls[i].addr, val);
+ val &= model->reserved;
+ wrmsrl(msrs->controls[i].addr, val);
}

/* avoid a false detection of ctr overflows in NMI handler */
@@ -112,19 +109,11 @@ static void op_amd_setup_ctrs(struct op_x86_model_spec const *model,
for (i = 0; i < NUM_COUNTERS; ++i) {
if ((counter_config[i].enabled) && (CTR_IS_RESERVED(msrs, i))) {
reset_value[i] = counter_config[i].count;
-
wrmsr(msrs->counters[i].addr, -(unsigned int)counter_config[i].count, -1);
-
- rdmsr(msrs->controls[i].addr, low, high);
- CTRL_CLEAR_LO(low);
- CTRL_CLEAR_HI(high);
- 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(low, counter_config[i].event);
- CTRL_SET_EVENT_HIGH(high, counter_config[i].event);
- wrmsr(msrs->controls[i].addr, low, high);
+ rdmsrl(msrs->controls[i].addr, val);
+ val &= model->reserved;
+ val |= op_x86_get_ctrl(model, &counter_config[i]);
+ wrmsrl(msrs->controls[i].addr, val);
} else {
reset_value[i] = 0;
}
@@ -486,14 +475,16 @@ static void op_amd_exit(void) {}
#endif /* CONFIG_OPROFILE_IBS */

struct op_x86_model_spec const op_amd_spec = {
- .init = op_amd_init,
- .exit = op_amd_exit,
.num_counters = NUM_COUNTERS,
.num_controls = NUM_CONTROLS,
+ .reserved = MSR_AMD_EVENTSEL_RESERVED,
+ .event_mask = OP_EVENT_MASK,
+ .init = op_amd_init,
+ .exit = op_amd_exit,
.fill_in_addresses = &op_amd_fill_in_addresses,
.setup_ctrs = &op_amd_setup_ctrs,
.check_ctrs = &op_amd_check_ctrs,
.start = &op_amd_start,
.stop = &op_amd_stop,
- .shutdown = &op_amd_shutdown
+ .shutdown = &op_amd_shutdown,
};
diff --git a/arch/x86/oprofile/op_model_ppro.c b/arch/x86/oprofile/op_model_ppro.c
index 40b44ee..3092f99 100644
--- a/arch/x86/oprofile/op_model_ppro.c
+++ b/arch/x86/oprofile/op_model_ppro.c
@@ -10,6 +10,7 @@
* @author Philippe Elie
* @author Graydon Hoare
* @author Andi Kleen
+ * @author Robert Richter <robert.richter@amd.com>
*/

#include <linux/oprofile.h>
@@ -26,8 +27,8 @@ static int num_counters = 2;
static int counter_width = 32;

#define CTR_OVERFLOWED(n) (!((n) & (1ULL<<(counter_width-1))))
-#define CTRL_CLEAR(x) (x &= (1<<21))
-#define CTRL_SET_EVENT(val, e) (val |= e)
+
+#define MSR_PPRO_EVENTSEL_RESERVED ((0xFFFFFFFFULL<<32)|(1ULL<<21))

static u64 *reset_value;

@@ -54,7 +55,7 @@ static void ppro_fill_in_addresses(struct op_msrs * const msrs)
static void ppro_setup_ctrs(struct op_x86_model_spec const *model,
struct op_msrs const * const msrs)
{
- unsigned int low, high;
+ u64 val;
int i;

if (!reset_value) {
@@ -85,9 +86,9 @@ static void ppro_setup_ctrs(struct op_x86_model_spec const *model,
for (i = 0 ; i < num_counters; ++i) {
if (unlikely(!CTRL_IS_RESERVED(msrs, i)))
continue;
- rdmsr(msrs->controls[i].addr, low, high);
- CTRL_CLEAR(low);
- wrmsr(msrs->controls[i].addr, low, high);
+ rdmsrl(msrs->controls[i].addr, val);
+ val &= model->reserved;
+ wrmsrl(msrs->controls[i].addr, val);
}

/* avoid a false detection of ctr overflows in NMI handler */
@@ -101,17 +102,11 @@ static void ppro_setup_ctrs(struct op_x86_model_spec const *model,
for (i = 0; i < num_counters; ++i) {
if ((counter_config[i].enabled) && (CTR_IS_RESERVED(msrs, i))) {
reset_value[i] = counter_config[i].count;
-
wrmsrl(msrs->counters[i].addr, -reset_value[i]);
-
- rdmsr(msrs->controls[i].addr, low, high);
- 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);
- wrmsr(msrs->controls[i].addr, low, high);
+ rdmsrl(msrs->controls[i].addr, val);
+ val &= model->reserved;
+ val |= op_x86_get_ctrl(model, &counter_config[i]);
+ wrmsrl(msrs->controls[i].addr, val);
} else {
reset_value[i] = 0;
}
@@ -205,6 +200,7 @@ static void ppro_shutdown(struct op_msrs const * const msrs)
struct op_x86_model_spec const op_ppro_spec = {
.num_counters = 2,
.num_controls = 2,
+ .reserved = MSR_PPRO_EVENTSEL_RESERVED,
.fill_in_addresses = &ppro_fill_in_addresses,
.setup_ctrs = &ppro_setup_ctrs,
.check_ctrs = &ppro_check_ctrs,
@@ -249,6 +245,7 @@ static int arch_perfmon_init(struct oprofile_operations *ignore)
}

struct op_x86_model_spec op_arch_perfmon_spec = {
+ .reserved = MSR_PPRO_EVENTSEL_RESERVED,
.init = &arch_perfmon_init,
/* num_counters/num_controls filled in at runtime */
.fill_in_addresses = &ppro_fill_in_addresses,
diff --git a/arch/x86/oprofile/op_x86_model.h b/arch/x86/oprofile/op_x86_model.h
index 6161c7f..3220d4c 100644
--- a/arch/x86/oprofile/op_x86_model.h
+++ b/arch/x86/oprofile/op_x86_model.h
@@ -6,21 +6,19 @@
* @remark Read the file COPYING
*
* @author Graydon Hoare
+ * @author Robert Richter <robert.richter@amd.com>
*/

#ifndef OP_X86_MODEL_H
#define OP_X86_MODEL_H

+#include <asm/types.h>
#include <asm/intel_arch_perfmon.h>

#define CTR_IS_RESERVED(msrs, c) ((msrs)->counters[(c)].addr ? 1 : 0)
#define CTRL_IS_RESERVED(msrs, c) ((msrs)->controls[(c)].addr ? 1 : 0)
#define CTRL_SET_ACTIVE(val) ((val) |= ARCH_PERFMON_EVENTSEL0_ENABLE)
-#define CTRL_SET_ENABLE(val) ((val) |= ARCH_PERFMON_EVENTSEL_INT)
#define CTRL_SET_INACTIVE(val) ((val) &= ~ARCH_PERFMON_EVENTSEL0_ENABLE)
-#define CTRL_SET_KERN(val, k) ((val) |= ((k) ? ARCH_PERFMON_EVENTSEL_OS : 0))
-#define CTRL_SET_USR(val, u) ((val) |= ((u) ? ARCH_PERFMON_EVENTSEL_USR : 0))
-#define CTRL_SET_UM(val, m) ((val) |= ((m) << 8))

struct op_saved_msr {
unsigned int high;
@@ -39,12 +37,16 @@ struct op_msrs {

struct pt_regs;

+struct oprofile_operations;
+
/* The model vtable abstracts the differences between
* various x86 CPU models' perfctr support.
*/
struct op_x86_model_spec {
unsigned int num_counters;
unsigned int num_controls;
+ u64 reserved;
+ u16 event_mask;
int (*init)(struct oprofile_operations *ops);
void (*exit)(void);
void (*fill_in_addresses)(struct op_msrs * const msrs);
@@ -57,6 +59,11 @@ struct op_x86_model_spec {
void (*shutdown)(struct op_msrs const * const msrs);
};

+struct op_counter_config;
+
+extern u64 op_x86_get_ctrl(struct op_x86_model_spec const *model,
+ struct op_counter_config *counter_config);
+
extern struct op_x86_model_spec const op_ppro_spec;
extern struct op_x86_model_spec const op_p4_spec;
extern struct op_x86_model_spec const op_p4_ht2_spec;
--
1.6.3.1



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