aboutsummaryrefslogtreecommitdiffstats
path: root/arch/arm/oprofile
diff options
context:
space:
mode:
Diffstat (limited to 'arch/arm/oprofile')
-rw-r--r--arch/arm/oprofile/Makefile4
-rw-r--r--arch/arm/oprofile/common.c319
2 files changed, 4 insertions, 319 deletions
diff --git a/arch/arm/oprofile/Makefile b/arch/arm/oprofile/Makefile
index e666eafed152..b2215c61cdf0 100644
--- a/arch/arm/oprofile/Makefile
+++ b/arch/arm/oprofile/Makefile
@@ -6,4 +6,8 @@ DRIVER_OBJS = $(addprefix ../../../drivers/oprofile/, \
6 oprofilefs.o oprofile_stats.o \ 6 oprofilefs.o oprofile_stats.o \
7 timer_int.o ) 7 timer_int.o )
8 8
9ifeq ($(CONFIG_HW_PERF_EVENTS),y)
10DRIVER_OBJS += $(addprefix ../../../drivers/oprofile/, oprofile_perf.o)
11endif
12
9oprofile-y := $(DRIVER_OBJS) common.o 13oprofile-y := $(DRIVER_OBJS) common.o
diff --git a/arch/arm/oprofile/common.c b/arch/arm/oprofile/common.c
index 8718311cb530..8aa974491dfc 100644
--- a/arch/arm/oprofile/common.c
+++ b/arch/arm/oprofile/common.c
@@ -25,136 +25,6 @@
25#include <asm/ptrace.h> 25#include <asm/ptrace.h>
26 26
27#ifdef CONFIG_HW_PERF_EVENTS 27#ifdef CONFIG_HW_PERF_EVENTS
28/*
29 * Per performance monitor configuration as set via oprofilefs.
30 */
31struct op_counter_config {
32 unsigned long count;
33 unsigned long enabled;
34 unsigned long event;
35 unsigned long unit_mask;
36 unsigned long kernel;
37 unsigned long user;
38 struct perf_event_attr attr;
39};
40
41static int oprofile_perf_enabled;
42static DEFINE_MUTEX(oprofile_perf_mutex);
43
44static struct op_counter_config *counter_config;
45static struct perf_event **perf_events[nr_cpumask_bits];
46static int num_counters;
47
48/*
49 * Overflow callback for oprofile.
50 */
51static void op_overflow_handler(struct perf_event *event, int unused,
52 struct perf_sample_data *data, struct pt_regs *regs)
53{
54 int id;
55 u32 cpu = smp_processor_id();
56
57 for (id = 0; id < num_counters; ++id)
58 if (perf_events[cpu][id] == event)
59 break;
60
61 if (id != num_counters)
62 oprofile_add_sample(regs, id);
63 else
64 pr_warning("oprofile: ignoring spurious overflow "
65 "on cpu %u\n", cpu);
66}
67
68/*
69 * Called by oprofile_perf_setup to create perf attributes to mirror the oprofile
70 * settings in counter_config. Attributes are created as `pinned' events and
71 * so are permanently scheduled on the PMU.
72 */
73static void op_perf_setup(void)
74{
75 int i;
76 u32 size = sizeof(struct perf_event_attr);
77 struct perf_event_attr *attr;
78
79 for (i = 0; i < num_counters; ++i) {
80 attr = &counter_config[i].attr;
81 memset(attr, 0, size);
82 attr->type = PERF_TYPE_RAW;
83 attr->size = size;
84 attr->config = counter_config[i].event;
85 attr->sample_period = counter_config[i].count;
86 attr->pinned = 1;
87 }
88}
89
90static int op_create_counter(int cpu, int event)
91{
92 int ret = 0;
93 struct perf_event *pevent;
94
95 if (!counter_config[event].enabled || (perf_events[cpu][event] != NULL))
96 return ret;
97
98 pevent = perf_event_create_kernel_counter(&counter_config[event].attr,
99 cpu, -1,
100 op_overflow_handler);
101
102 if (IS_ERR(pevent)) {
103 ret = PTR_ERR(pevent);
104 } else if (pevent->state != PERF_EVENT_STATE_ACTIVE) {
105 pr_warning("oprofile: failed to enable event %d "
106 "on CPU %d\n", event, cpu);
107 ret = -EBUSY;
108 } else {
109 perf_events[cpu][event] = pevent;
110 }
111
112 return ret;
113}
114
115static void op_destroy_counter(int cpu, int event)
116{
117 struct perf_event *pevent = perf_events[cpu][event];
118
119 if (pevent) {
120 perf_event_release_kernel(pevent);
121 perf_events[cpu][event] = NULL;
122 }
123}
124
125/*
126 * Called by oprofile_perf_start to create active perf events based on the
127 * perviously configured attributes.
128 */
129static int op_perf_start(void)
130{
131 int cpu, event, ret = 0;
132
133 for_each_online_cpu(cpu) {
134 for (event = 0; event < num_counters; ++event) {
135 ret = op_create_counter(cpu, event);
136 if (ret)
137 goto out;
138 }
139 }
140
141out:
142 return ret;
143}
144
145/*
146 * Called by oprofile_perf_stop at the end of a profiling run.
147 */
148static void op_perf_stop(void)
149{
150 int cpu, event;
151
152 for_each_online_cpu(cpu)
153 for (event = 0; event < num_counters; ++event)
154 op_destroy_counter(cpu, event);
155}
156
157
158char *op_name_from_perf_id(void) 28char *op_name_from_perf_id(void)
159{ 29{
160 enum arm_perf_pmu_ids id = armpmu_get_pmu_id(); 30 enum arm_perf_pmu_ids id = armpmu_get_pmu_id();
@@ -177,116 +47,6 @@ char *op_name_from_perf_id(void)
177 } 47 }
178} 48}
179 49
180static int oprofile_perf_create_files(struct super_block *sb, struct dentry *root)
181{
182 unsigned int i;
183
184 for (i = 0; i < num_counters; i++) {
185 struct dentry *dir;
186 char buf[4];
187
188 snprintf(buf, sizeof buf, "%d", i);
189 dir = oprofilefs_mkdir(sb, root, buf);
190 oprofilefs_create_ulong(sb, dir, "enabled", &counter_config[i].enabled);
191 oprofilefs_create_ulong(sb, dir, "event", &counter_config[i].event);
192 oprofilefs_create_ulong(sb, dir, "count", &counter_config[i].count);
193 oprofilefs_create_ulong(sb, dir, "unit_mask", &counter_config[i].unit_mask);
194 oprofilefs_create_ulong(sb, dir, "kernel", &counter_config[i].kernel);
195 oprofilefs_create_ulong(sb, dir, "user", &counter_config[i].user);
196 }
197
198 return 0;
199}
200
201static int oprofile_perf_setup(void)
202{
203 spin_lock(&oprofilefs_lock);
204 op_perf_setup();
205 spin_unlock(&oprofilefs_lock);
206 return 0;
207}
208
209static int oprofile_perf_start(void)
210{
211 int ret = -EBUSY;
212
213 mutex_lock(&oprofile_perf_mutex);
214 if (!oprofile_perf_enabled) {
215 ret = 0;
216 op_perf_start();
217 oprofile_perf_enabled = 1;
218 }
219 mutex_unlock(&oprofile_perf_mutex);
220 return ret;
221}
222
223static void oprofile_perf_stop(void)
224{
225 mutex_lock(&oprofile_perf_mutex);
226 if (oprofile_perf_enabled)
227 op_perf_stop();
228 oprofile_perf_enabled = 0;
229 mutex_unlock(&oprofile_perf_mutex);
230}
231
232#ifdef CONFIG_PM
233static int oprofile_perf_suspend(struct platform_device *dev, pm_message_t state)
234{
235 mutex_lock(&oprofile_perf_mutex);
236 if (oprofile_perf_enabled)
237 op_perf_stop();
238 mutex_unlock(&oprofile_perf_mutex);
239 return 0;
240}
241
242static int oprofile_perf_resume(struct platform_device *dev)
243{
244 mutex_lock(&oprofile_perf_mutex);
245 if (oprofile_perf_enabled && op_perf_start())
246 oprofile_perf_enabled = 0;
247 mutex_unlock(&oprofile_perf_mutex);
248 return 0;
249}
250
251static struct platform_driver oprofile_driver = {
252 .driver = {
253 .name = "oprofile-perf",
254 },
255 .resume = oprofile_perf_resume,
256 .suspend = oprofile_perf_suspend,
257};
258
259static struct platform_device *oprofile_pdev;
260
261static int __init init_driverfs(void)
262{
263 int ret;
264
265 ret = platform_driver_register(&oprofile_driver);
266 if (ret)
267 goto out;
268
269 oprofile_pdev = platform_device_register_simple(
270 oprofile_driver.driver.name, 0, NULL, 0);
271 if (IS_ERR(oprofile_pdev)) {
272 ret = PTR_ERR(oprofile_pdev);
273 platform_driver_unregister(&oprofile_driver);
274 }
275
276out:
277 return ret;
278}
279
280static void __exit exit_driverfs(void)
281{
282 platform_device_unregister(oprofile_pdev);
283 platform_driver_unregister(&oprofile_driver);
284}
285#else
286static int __init init_driverfs(void) { return 0; }
287#define exit_driverfs() do { } while (0)
288#endif /* CONFIG_PM */
289
290static int report_trace(struct stackframe *frame, void *d) 50static int report_trace(struct stackframe *frame, void *d)
291{ 51{
292 unsigned int *depth = d; 52 unsigned int *depth = d;
@@ -349,66 +109,6 @@ static void arm_backtrace(struct pt_regs * const regs, unsigned int depth)
349 tail = user_backtrace(tail); 109 tail = user_backtrace(tail);
350} 110}
351 111
352int __init oprofile_perf_init(struct oprofile_operations *ops)
353{
354 int cpu, ret = 0;
355
356 memset(&perf_events, 0, sizeof(perf_events));
357
358 num_counters = perf_num_counters();
359 if (num_counters <= 0) {
360 pr_info("oprofile: no performance counters\n");
361 ret = -ENODEV;
362 goto out;
363 }
364
365 counter_config = kcalloc(num_counters,
366 sizeof(struct op_counter_config), GFP_KERNEL);
367
368 if (!counter_config) {
369 pr_info("oprofile: failed to allocate %d "
370 "counters\n", num_counters);
371 ret = -ENOMEM;
372 goto out;
373 }
374
375 ret = init_driverfs();
376 if (ret)
377 goto out;
378
379 for_each_possible_cpu(cpu) {
380 perf_events[cpu] = kcalloc(num_counters,
381 sizeof(struct perf_event *), GFP_KERNEL);
382 if (!perf_events[cpu]) {
383 pr_info("oprofile: failed to allocate %d perf events "
384 "for cpu %d\n", num_counters, cpu);
385 ret = -ENOMEM;
386 goto out;
387 }
388 }
389
390 ops->create_files = oprofile_perf_create_files;
391 ops->setup = oprofile_perf_setup;
392 ops->start = oprofile_perf_start;
393 ops->stop = oprofile_perf_stop;
394 ops->shutdown = oprofile_perf_stop;
395 ops->cpu_type = op_name_from_perf_id();
396
397 if (!ops->cpu_type)
398 ret = -ENODEV;
399 else
400 pr_info("oprofile: using %s\n", ops->cpu_type);
401
402out:
403 if (ret) {
404 for_each_possible_cpu(cpu)
405 kfree(perf_events[cpu]);
406 kfree(counter_config);
407 }
408
409 return ret;
410}
411
412int __init oprofile_arch_init(struct oprofile_operations *ops) 112int __init oprofile_arch_init(struct oprofile_operations *ops)
413{ 113{
414 ops->backtrace = arm_backtrace; 114 ops->backtrace = arm_backtrace;
@@ -416,25 +116,6 @@ int __init oprofile_arch_init(struct oprofile_operations *ops)
416 return oprofile_perf_init(ops); 116 return oprofile_perf_init(ops);
417} 117}
418 118
419void __exit oprofile_perf_exit(void)
420{
421 int cpu, id;
422 struct perf_event *event;
423
424 for_each_possible_cpu(cpu) {
425 for (id = 0; id < num_counters; ++id) {
426 event = perf_events[cpu][id];
427 if (event)
428 perf_event_release_kernel(event);
429 }
430
431 kfree(perf_events[cpu]);
432 }
433
434 kfree(counter_config);
435 exit_driverfs();
436}
437
438void __exit oprofile_arch_exit(void) 119void __exit oprofile_arch_exit(void)
439{ 120{
440 oprofile_perf_exit(); 121 oprofile_perf_exit();
generated by cgit v1.2.2 (git 2.25.0) at 2024-12-20 09:34:15 -0500