@@ -6,4 +6,8 @@ DRIVER_OBJS = $(addprefix ../../../drivers/oprofile/, \
oprofilefs.o oprofile_stats.o \
timer_int.o )
+ifeq ($(CONFIG_HW_PERF_EVENTS), y)
+DRIVER_OBJS += $(addprefix ../../../drivers/oprofile/, oprofile_perf.o)
+endif
+
oprofile-y := $(DRIVER_OBJS) common.o
@@ -25,136 +25,9 @@
#include <asm/ptrace.h>
#ifdef CONFIG_HW_PERF_EVENTS
-/*
- * Per performance monitor configuration as set via oprofilefs.
- */
-struct op_counter_config {
- unsigned long count;
- unsigned long enabled;
- unsigned long event;
- unsigned long unit_mask;
- unsigned long kernel;
- unsigned long user;
- struct perf_event_attr attr;
-};
-
static int op_arm_enabled;
static DEFINE_MUTEX(op_arm_mutex);
-static struct op_counter_config *counter_config;
-static struct perf_event **perf_events[nr_cpumask_bits];
-static int perf_num_counters;
-
-/*
- * Overflow callback for oprofile.
- */
-static void op_overflow_handler(struct perf_event *event, int unused,
- struct perf_sample_data *data, struct pt_regs *regs)
-{
- int id;
- u32 cpu = smp_processor_id();
-
- for (id = 0; id < perf_num_counters; ++id)
- if (perf_events[cpu][id] == event)
- break;
-
- if (id != perf_num_counters)
- oprofile_add_sample(regs, id);
- else
- pr_warning("oprofile: ignoring spurious overflow "
- "on cpu %u\n", cpu);
-}
-
-/*
- * Called by op_arm_setup to create perf attributes to mirror the oprofile
- * settings in counter_config. Attributes are created as `pinned' events and
- * so are permanently scheduled on the PMU.
- */
-static void op_perf_setup(void)
-{
- int i;
- u32 size = sizeof(struct perf_event_attr);
- struct perf_event_attr *attr;
-
- for (i = 0; i < perf_num_counters; ++i) {
- attr = &counter_config[i].attr;
- memset(attr, 0, size);
- attr->type = PERF_TYPE_RAW;
- attr->size = size;
- attr->config = counter_config[i].event;
- attr->sample_period = counter_config[i].count;
- attr->pinned = 1;
- }
-}
-
-static int op_create_counter(int cpu, int event)
-{
- int ret = 0;
- struct perf_event *pevent;
-
- if (!counter_config[event].enabled || (perf_events[cpu][event] != NULL))
- return ret;
-
- pevent = perf_event_create_kernel_counter(&counter_config[event].attr,
- cpu, -1,
- op_overflow_handler);
-
- if (IS_ERR(pevent)) {
- ret = PTR_ERR(pevent);
- } else if (pevent->state != PERF_EVENT_STATE_ACTIVE) {
- pr_warning("oprofile: failed to enable event %d "
- "on CPU %d\n", event, cpu);
- ret = -EBUSY;
- } else {
- perf_events[cpu][event] = pevent;
- }
-
- return ret;
-}
-
-static void op_destroy_counter(int cpu, int event)
-{
- struct perf_event *pevent = perf_events[cpu][event];
-
- if (pevent) {
- perf_event_release_kernel(pevent);
- perf_events[cpu][event] = NULL;
- }
-}
-
-/*
- * Called by op_arm_start to create active perf events based on the
- * perviously configured attributes.
- */
-static int op_perf_start(void)
-{
- int cpu, event, ret = 0;
-
- for_each_online_cpu(cpu) {
- for (event = 0; event < perf_num_counters; ++event) {
- ret = op_create_counter(cpu, event);
- if (ret)
- goto out;
- }
- }
-
-out:
- return ret;
-}
-
-/*
- * Called by op_arm_stop at the end of a profiling run.
- */
-static void op_perf_stop(void)
-{
- int cpu, event;
-
- for_each_online_cpu(cpu)
- for (event = 0; event < perf_num_counters; ++event)
- op_destroy_counter(cpu, event);
-}
-
-
static char *op_name_from_perf_id(enum arm_perf_pmu_ids id)
{
switch (id) {
@@ -175,31 +48,10 @@ static char *op_name_from_perf_id(enum arm_perf_pmu_ids id)
}
}
-static int op_arm_create_files(struct super_block *sb, struct dentry *root)
-{
- unsigned int i;
-
- for (i = 0; i < perf_num_counters; i++) {
- struct dentry *dir;
- char buf[4];
-
- snprintf(buf, sizeof buf, "%d", i);
- dir = oprofilefs_mkdir(sb, root, buf);
- oprofilefs_create_ulong(sb, dir, "enabled", &counter_config[i].enabled);
- oprofilefs_create_ulong(sb, dir, "event", &counter_config[i].event);
- oprofilefs_create_ulong(sb, dir, "count", &counter_config[i].count);
- oprofilefs_create_ulong(sb, dir, "unit_mask", &counter_config[i].unit_mask);
- oprofilefs_create_ulong(sb, dir, "kernel", &counter_config[i].kernel);
- oprofilefs_create_ulong(sb, dir, "user", &counter_config[i].user);
- }
-
- return 0;
-}
-
static int op_arm_setup(void)
{
spin_lock(&oprofilefs_lock);
- op_perf_setup();
+ oprofile_perf_setup();
spin_unlock(&oprofilefs_lock);
return 0;
}
@@ -211,7 +63,7 @@ static int op_arm_start(void)
mutex_lock(&op_arm_mutex);
if (!op_arm_enabled) {
ret = 0;
- op_perf_start();
+ oprofile_perf_start();
op_arm_enabled = 1;
}
mutex_unlock(&op_arm_mutex);
@@ -222,7 +74,7 @@ static void op_arm_stop(void)
{
mutex_lock(&op_arm_mutex);
if (op_arm_enabled)
- op_perf_stop();
+ oprofile_perf_stop();
op_arm_enabled = 0;
mutex_unlock(&op_arm_mutex);
}
@@ -232,7 +84,7 @@ static int op_arm_suspend(struct platform_device *dev, pm_message_t state)
{
mutex_lock(&op_arm_mutex);
if (op_arm_enabled)
- op_perf_stop();
+ oprofile_perf_stop();
mutex_unlock(&op_arm_mutex);
return 0;
}
@@ -240,7 +92,7 @@ static int op_arm_suspend(struct platform_device *dev, pm_message_t state)
static int op_arm_resume(struct platform_device *dev)
{
mutex_lock(&op_arm_mutex);
- if (op_arm_enabled && op_perf_start())
+ if (op_arm_enabled && oprofile_perf_start())
op_arm_enabled = 0;
mutex_unlock(&op_arm_mutex);
return 0;
@@ -351,37 +203,16 @@ static void arm_backtrace(struct pt_regs * const regs, unsigned int depth)
int __init oprofile_arch_init(struct oprofile_operations *ops)
{
- int cpu, ret = 0;
-
- perf_num_counters = armpmu_get_max_events();
-
- counter_config = kcalloc(perf_num_counters,
- sizeof(struct op_counter_config), GFP_KERNEL);
-
- if (!counter_config) {
- pr_info("oprofile: failed to allocate %d "
- "counters\n", perf_num_counters);
- return -ENOMEM;
- }
+ int ret = 0;
ret = init_driverfs();
if (ret)
return ret;
- for_each_possible_cpu(cpu) {
- perf_events[cpu] = kcalloc(perf_num_counters,
- sizeof(struct perf_event *), GFP_KERNEL);
- if (!perf_events[cpu]) {
- pr_info("oprofile: failed to allocate %d perf events "
- "for cpu %d\n", perf_num_counters, cpu);
- while (--cpu >= 0)
- kfree(perf_events[cpu]);
- return -ENOMEM;
- }
- }
+ oprofile_perf_set_num_counters(armpmu_get_max_events());
ops->backtrace = arm_backtrace;
- ops->create_files = op_arm_create_files;
+ ops->create_files = oprofile_perf_create_files;
ops->setup = op_arm_setup;
ops->start = op_arm_start;
ops->stop = op_arm_stop;
@@ -389,33 +220,21 @@ int __init oprofile_arch_init(struct oprofile_operations *ops)
ops->cpu_type = op_name_from_perf_id(armpmu_get_pmu_id());
if (!ops->cpu_type)
- ret = -ENODEV;
- else
- pr_info("oprofile: using %s\n", ops->cpu_type);
+ return -ENODEV;
- return ret;
+ ret = oprofile_perf_init();
+ if (ret != 0)
+ return ret;
+
+ pr_info("oprofile: using %s\n", ops->cpu_type);
+
+ return 0;
}
void oprofile_arch_exit(void)
{
- int cpu, id;
- struct perf_event *event;
-
+ oprofile_perf_exit();
exit_driverfs();
-
- if (*perf_events) {
- for_each_possible_cpu(cpu) {
- for (id = 0; id < perf_num_counters; ++id) {
- event = perf_events[cpu][id];
- if (event != NULL)
- perf_event_release_kernel(event);
- }
- kfree(perf_events[cpu]);
- }
- }
-
- if (counter_config)
- kfree(counter_config);
}
#else
int __init oprofile_arch_init(struct oprofile_operations *ops)
new file mode 100644
@@ -0,0 +1,209 @@
+/*
+ * Copyright 2010 ARM Ltd.
+ *
+ * Perf-events backend for OProfile.
+ */
+#include <linux/slab.h>
+#include <linux/oprofile.h>
+#include <linux/perf_event.h>
+
+/* Per-counter configuration as set via oprofilefs. */
+struct op_counter_config {
+ unsigned long enabled;
+ unsigned long event;
+
+ unsigned long count;
+
+ /* Dummy values for userspace tool compliance */
+ unsigned long kernel;
+ unsigned long user;
+ unsigned long unit_mask;
+
+ struct perf_event_attr attr;
+};
+
+static struct op_counter_config *counter_config;
+static struct perf_event **perf_events[nr_cpumask_bits];
+static int perf_num_counters;
+
+/*
+ * Overflow callback for oprofile.
+ */
+static void op_overflow_handler(struct perf_event *event, int unused,
+ struct perf_sample_data *data,
+ struct pt_regs *regs)
+{
+ int id;
+ u32 cpu = smp_processor_id();
+
+ for (id = 0; id < perf_num_counters; ++id)
+ if (perf_events[cpu][id] == event)
+ break;
+
+ if (id != perf_num_counters)
+ oprofile_add_sample(regs, id);
+ else
+ pr_warning("oprofile: ignoring spurious overflow "
+ "on cpu %u\n", cpu);
+}
+
+/*
+ * Create perf attributes to mirror the oprofile settings in
+ * counter_config. Attributes are created as `pinned' events and so are
+ * permanently scheduled on the PMU.
+ */
+int oprofile_perf_setup(void)
+{
+ int i;
+ u32 attr_size = sizeof(struct perf_event_attr);
+ struct perf_event_attr *attr;
+
+ for (i = 0; i < perf_num_counters; ++i) {
+ attr = &counter_config[i].attr;
+ memset(attr, 0, attr_size);
+ attr->type = PERF_TYPE_RAW;
+ attr->size = attr_size;
+ attr->config = counter_config[i].event;
+ attr->sample_period = counter_config[i].count;
+ attr->pinned = 1;
+ }
+
+ return 0;
+}
+
+int oprofile_create_counter(int cpu, int event)
+{
+ int ret = 0;
+ struct perf_event *pevent;
+
+ if (!counter_config[event].enabled || (perf_events[cpu][event] != NULL))
+ return ret;
+
+ pevent = perf_event_create_kernel_counter(&counter_config[event].attr,
+ cpu, -1,
+ op_overflow_handler);
+
+ if (IS_ERR(pevent)) {
+ ret = PTR_ERR(pevent);
+ } else if (pevent->state != PERF_EVENT_STATE_ACTIVE) {
+ pr_warning("oprofile: failed to enable event %d "
+ "on CPU %d\n", event, cpu);
+ ret = -EBUSY;
+ } else {
+ perf_events[cpu][event] = pevent;
+ }
+
+ return ret;
+}
+
+void oprofile_destroy_counter(int cpu, int event)
+{
+ struct perf_event *pevent = perf_events[cpu][event];
+
+ if (pevent) {
+ perf_event_release_kernel(pevent);
+ perf_events[cpu][event] = NULL;
+ }
+}
+
+int oprofile_perf_init(void)
+{
+ u32 counter_size = sizeof(struct op_counter_config);
+ int cpu;
+
+ counter_config = kcalloc(perf_num_counters, counter_size, GFP_KERNEL);
+
+ if (!counter_config) {
+ pr_info("oprofile: failed to allocate %d "
+ "counters\n", perf_num_counters);
+ return -ENOMEM;
+ }
+
+ for_each_possible_cpu(cpu) {
+ perf_events[cpu] = kcalloc(perf_num_counters,
+ sizeof(struct perf_event *), GFP_KERNEL);
+ if (!perf_events[cpu]) {
+ pr_info("oprofile: failed to allocate %d perf events "
+ "for cpu %d\n", perf_num_counters, cpu);
+ while (--cpu >= 0)
+ kfree(perf_events[cpu]);
+ kfree(counter_config);
+ return -ENOMEM;
+ }
+ }
+
+ return 0;
+}
+
+void oprofile_perf_exit(void)
+{
+ int id, cpu;
+
+ for_each_possible_cpu(cpu) {
+ for (id = 0; id < perf_num_counters; ++id)
+ oprofile_destroy_counter(cpu, id);
+
+ kfree(perf_events[cpu]);
+ }
+
+ kfree(counter_config);
+}
+
+/*
+ * Create active perf events based on the perviously configured
+ * attributes.
+ */
+int oprofile_perf_start(void)
+{
+ int cpu, event, ret = 0;
+
+ for_each_online_cpu(cpu) {
+ for (event = 0; event < perf_num_counters; ++event) {
+ ret = oprofile_create_counter(cpu, event);
+ if (ret)
+ goto out;
+ }
+ }
+
+out:
+ return ret;
+}
+
+/*
+ * Called at the end of a profiling run.
+ */
+void oprofile_perf_stop(void)
+{
+ int cpu, event;
+
+ for_each_online_cpu(cpu)
+ for (event = 0; event < perf_num_counters; ++event)
+ oprofile_destroy_counter(cpu, event);
+}
+
+
+int oprofile_perf_create_files(struct super_block *sb, struct dentry *root)
+{
+ int i;
+
+ for (i = 0; i < perf_num_counters; i++) {
+ struct dentry *dir;
+ char buf[4];
+
+ snprintf(buf, sizeof buf, "%d", i);
+ dir = oprofilefs_mkdir(sb, root, buf);
+ oprofilefs_create_ulong(sb, dir, "enabled", &counter_config[i].enabled);
+ oprofilefs_create_ulong(sb, dir, "event", &counter_config[i].event);
+ oprofilefs_create_ulong(sb, dir, "count", &counter_config[i].count);
+ oprofilefs_create_ulong(sb, dir, "unit_mask", &counter_config[i].unit_mask);
+ oprofilefs_create_ulong(sb, dir, "kernel", &counter_config[i].kernel);
+ oprofilefs_create_ulong(sb, dir, "user", &counter_config[i].user);
+ }
+
+ return 0;
+}
+
+void oprofile_perf_set_num_counters(int num_counters)
+{
+ perf_num_counters = num_counters;
+}
@@ -185,4 +185,16 @@ int oprofile_add_data(struct op_entry *entry, unsigned long val);
int oprofile_add_data64(struct op_entry *entry, u64 val);
int oprofile_write_commit(struct op_entry *entry);
+/* Oprofile perf wrapper functions. */
+
+#ifdef CONFIG_PERF_EVENTS
+int oprofile_perf_init(void);
+void oprofile_perf_exit(void);
+int oprofile_perf_setup(void);
+int oprofile_perf_start(void);
+void oprofile_perf_stop(void);
+int oprofile_perf_create_files(struct super_block *sb, struct dentry *root);
+void oprofile_perf_set_num_counters(int num_counters);
+#endif /* CONFIG_PERF_EVENTS */
+
#endif /* OPROFILE_H */