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yaml
---
r: 211919
b: refs/heads/master
c: 3d90a00
h: refs/heads/master
i:
  211917: f10e5de
  211915: 62588df
  211911: 2010597
  211903: b561b79
v: v3
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Matt Fleming authored and Robert Richter committed Oct 11, 2010
1 parent 1ce27fa commit 030a684
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Showing 5 changed files with 334 additions and 320 deletions.
2 changes: 1 addition & 1 deletion [refs]
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@@ -1,2 +1,2 @@
---
refs/heads/master: 58850e210cd207399cf6461326e322541b2ec81c
refs/heads/master: 3d90a00763b51e1db344a7430c966be723b67a29
4 changes: 4 additions & 0 deletions trunk/arch/arm/oprofile/Makefile
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Expand Up @@ -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
319 changes: 0 additions & 319 deletions trunk/arch/arm/oprofile/common.c
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Original file line number Diff line number Diff line change
Expand Up @@ -25,136 +25,6 @@
#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 oprofile_perf_enabled;
static DEFINE_MUTEX(oprofile_perf_mutex);

static struct op_counter_config *counter_config;
static struct perf_event **perf_events[nr_cpumask_bits];
static int 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 < num_counters; ++id)
if (perf_events[cpu][id] == event)
break;

if (id != num_counters)
oprofile_add_sample(regs, id);
else
pr_warning("oprofile: ignoring spurious overflow "
"on cpu %u\n", cpu);
}

/*
* Called by oprofile_perf_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 < 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 oprofile_perf_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 < num_counters; ++event) {
ret = op_create_counter(cpu, event);
if (ret)
goto out;
}
}

out:
return ret;
}

/*
* Called by oprofile_perf_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 < num_counters; ++event)
op_destroy_counter(cpu, event);
}


char *op_name_from_perf_id(void)
{
enum arm_perf_pmu_ids id = armpmu_get_pmu_id();
Expand All @@ -177,116 +47,6 @@ char *op_name_from_perf_id(void)
}
}

static int oprofile_perf_create_files(struct super_block *sb, struct dentry *root)
{
unsigned int i;

for (i = 0; i < 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 oprofile_perf_setup(void)
{
spin_lock(&oprofilefs_lock);
op_perf_setup();
spin_unlock(&oprofilefs_lock);
return 0;
}

static int oprofile_perf_start(void)
{
int ret = -EBUSY;

mutex_lock(&oprofile_perf_mutex);
if (!oprofile_perf_enabled) {
ret = 0;
op_perf_start();
oprofile_perf_enabled = 1;
}
mutex_unlock(&oprofile_perf_mutex);
return ret;
}

static void oprofile_perf_stop(void)
{
mutex_lock(&oprofile_perf_mutex);
if (oprofile_perf_enabled)
op_perf_stop();
oprofile_perf_enabled = 0;
mutex_unlock(&oprofile_perf_mutex);
}

#ifdef CONFIG_PM
static int oprofile_perf_suspend(struct platform_device *dev, pm_message_t state)
{
mutex_lock(&oprofile_perf_mutex);
if (oprofile_perf_enabled)
op_perf_stop();
mutex_unlock(&oprofile_perf_mutex);
return 0;
}

static int oprofile_perf_resume(struct platform_device *dev)
{
mutex_lock(&oprofile_perf_mutex);
if (oprofile_perf_enabled && op_perf_start())
oprofile_perf_enabled = 0;
mutex_unlock(&oprofile_perf_mutex);
return 0;
}

static struct platform_driver oprofile_driver = {
.driver = {
.name = "oprofile-perf",
},
.resume = oprofile_perf_resume,
.suspend = oprofile_perf_suspend,
};

static struct platform_device *oprofile_pdev;

static int __init init_driverfs(void)
{
int ret;

ret = platform_driver_register(&oprofile_driver);
if (ret)
goto out;

oprofile_pdev = platform_device_register_simple(
oprofile_driver.driver.name, 0, NULL, 0);
if (IS_ERR(oprofile_pdev)) {
ret = PTR_ERR(oprofile_pdev);
platform_driver_unregister(&oprofile_driver);
}

out:
return ret;
}

static void __exit exit_driverfs(void)
{
platform_device_unregister(oprofile_pdev);
platform_driver_unregister(&oprofile_driver);
}
#else
static int __init init_driverfs(void) { return 0; }
#define exit_driverfs() do { } while (0)
#endif /* CONFIG_PM */

static int report_trace(struct stackframe *frame, void *d)
{
unsigned int *depth = d;
Expand Down Expand Up @@ -349,92 +109,13 @@ static void arm_backtrace(struct pt_regs * const regs, unsigned int depth)
tail = user_backtrace(tail);
}

int __init oprofile_perf_init(struct oprofile_operations *ops)
{
int cpu, ret = 0;

memset(&perf_events, 0, sizeof(perf_events));

num_counters = perf_num_counters();
if (num_counters <= 0) {
pr_info("oprofile: no performance counters\n");
ret = -ENODEV;
goto out;
}

counter_config = kcalloc(num_counters,
sizeof(struct op_counter_config), GFP_KERNEL);

if (!counter_config) {
pr_info("oprofile: failed to allocate %d "
"counters\n", num_counters);
ret = -ENOMEM;
goto out;
}

ret = init_driverfs();
if (ret)
goto out;

for_each_possible_cpu(cpu) {
perf_events[cpu] = kcalloc(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", num_counters, cpu);
ret = -ENOMEM;
goto out;
}
}

ops->create_files = oprofile_perf_create_files;
ops->setup = oprofile_perf_setup;
ops->start = oprofile_perf_start;
ops->stop = oprofile_perf_stop;
ops->shutdown = oprofile_perf_stop;
ops->cpu_type = op_name_from_perf_id();

if (!ops->cpu_type)
ret = -ENODEV;
else
pr_info("oprofile: using %s\n", ops->cpu_type);

out:
if (ret) {
for_each_possible_cpu(cpu)
kfree(perf_events[cpu]);
kfree(counter_config);
}

return ret;
}

int __init oprofile_arch_init(struct oprofile_operations *ops)
{
ops->backtrace = arm_backtrace;

return oprofile_perf_init(ops);
}

void __exit oprofile_perf_exit(void)
{
int cpu, id;
struct perf_event *event;

for_each_possible_cpu(cpu) {
for (id = 0; id < num_counters; ++id) {
event = perf_events[cpu][id];
if (event)
perf_event_release_kernel(event);
}

kfree(perf_events[cpu]);
}

kfree(counter_config);
exit_driverfs();
}

void __exit oprofile_arch_exit(void)
{
oprofile_perf_exit();
Expand Down
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