#undef DECLARE_EVENT_CLASS
#define DECLARE_EVENT_CLASS(call, proto, args, tstruct, assign, print) \
static notrace void \
-perf_trace_templ_##call(struct ftrace_event_call *event_call, \
- struct pt_regs *__regs, proto) \
+perf_trace_##call(void *__data, proto) \
{ \
+ struct ftrace_event_call *event_call = __data; \
struct ftrace_data_offsets_##call __maybe_unused __data_offsets;\
struct ftrace_raw_##call *entry; \
- struct pt_regs *__regs = &get_cpu_var(perf_trace_regs); \
++ struct pt_regs __regs; \
u64 __addr = 0, __count = 1; \
- unsigned long irq_flags; \
+ struct hlist_head *head; \
int __entry_size; \
int __data_size; \
int rctx; \
\
- perf_fetch_caller_regs(__regs, 1); \
++ perf_fetch_caller_regs(&__regs, 1); \
+ \
__data_size = ftrace_get_offsets_##call(&__data_offsets, args); \
__entry_size = ALIGN(__data_size + sizeof(*entry) + sizeof(u32),\
sizeof(u64)); \
\
if (WARN_ONCE(__entry_size > PERF_MAX_TRACE_SIZE, \
"profile buffer not large enough")) \
- goto out; \
+ return; \
+ \
entry = (struct ftrace_raw_##call *)perf_trace_buf_prepare( \
- __entry_size, event_call->event.type, &rctx, &irq_flags); \
- __entry_size, event_call->id, __regs, &rctx); \
++ __entry_size, event_call->event.type, &__regs, &rctx); \
if (!entry) \
- goto out; \
+ return; \
+ \
tstruct \
\
{ assign; } \
\
+ head = per_cpu_ptr(event_call->perf_events, smp_processor_id());\
perf_trace_buf_submit(entry, __entry_size, rctx, __addr, \
- __count, irq_flags, __regs); \
- out: \
- put_cpu_var(perf_trace_regs); \
- __count, __regs, head); \
++ __count, &__regs, head); \
}
+/*
+ * This part is compiled out, it is only here as a build time check
+ * to make sure that if the tracepoint handling changes, the
+ * perf probe will fail to compile unless it too is updated.
+ */
#undef DEFINE_EVENT
#define DEFINE_EVENT(template, call, proto, args) \
-static notrace void perf_trace_##call(proto) \
+static inline void perf_test_probe_##call(void) \
{ \
- struct ftrace_event_call *event_call = &event_##call; \
- struct pt_regs __regs; \
- \
- perf_fetch_caller_regs(&__regs, 1); \
- perf_trace_templ_##template(event_call, &__regs, args); \
+ check_trace_callback_type_##call(perf_trace_##template); \
- \
}
+
#undef DEFINE_EVENT_PRINT
#define DEFINE_EVENT_PRINT(template, name, proto, args, print) \
DEFINE_EVENT(template, name, PARAMS(proto), PARAMS(args))
/* Count the events in use (per event id, not per instance) */
static int total_ref_count;
- static int perf_trace_event_enable(struct ftrace_event_call *event)
+ static int perf_trace_event_init(struct ftrace_event_call *tp_event,
+ struct perf_event *p_event)
{
- char *buf;
+ struct hlist_head *list;
int ret = -ENOMEM;
+ int cpu;
- if (event->perf_refcount++ > 0)
+ p_event->tp_event = tp_event;
+ if (tp_event->perf_refcount++ > 0)
return 0;
- if (!total_ref_count) {
- buf = (char *)alloc_percpu(perf_trace_t);
- if (!buf)
- goto fail_buf;
+ list = alloc_percpu(struct hlist_head);
+ if (!list)
+ goto fail;
+
+ for_each_possible_cpu(cpu)
+ INIT_HLIST_HEAD(per_cpu_ptr(list, cpu));
- rcu_assign_pointer(perf_trace_buf, buf);
+ tp_event->perf_events = list;
+
+ if (!total_ref_count) {
+ char *buf;
+ int i;
- buf = (char *)alloc_percpu(perf_trace_t);
- if (!buf)
- goto fail_buf_nmi;
+ for (i = 0; i < 4; i++) {
+ buf = (char *)alloc_percpu(perf_trace_t);
+ if (!buf)
+ goto fail;
- rcu_assign_pointer(perf_trace_buf_nmi, buf);
+ perf_trace_buf[i] = buf;
+ }
}
- if (event->class->reg)
- ret = event->class->reg(event, TRACE_REG_PERF_REGISTER);
- ret = tp_event->perf_event_enable(tp_event);
++ if (tp_event->class->reg)
++ ret = tp_event->class->reg(tp_event, TRACE_REG_PERF_REGISTER);
+ else
- ret = tracepoint_probe_register(event->name,
- event->class->perf_probe,
- event);
- if (!ret) {
- total_ref_count++;
- return 0;
- }
++ ret = tracepoint_probe_register(tp_event->name,
++ tp_event->class->perf_probe,
++ tp_event);
++
+ if (ret)
+ goto fail;
- fail_buf_nmi:
+ total_ref_count++;
+ return 0;
+
+ fail:
if (!total_ref_count) {
- free_percpu(perf_trace_buf_nmi);
- free_percpu(perf_trace_buf);
- perf_trace_buf_nmi = NULL;
- perf_trace_buf = NULL;
+ int i;
+
+ for (i = 0; i < 4; i++) {
+ free_percpu(perf_trace_buf[i]);
+ perf_trace_buf[i] = NULL;
+ }
+ }
+
+ if (!--tp_event->perf_refcount) {
+ free_percpu(tp_event->perf_events);
+ tp_event->perf_events = NULL;
}
- fail_buf:
- event->perf_refcount--;
return ret;
}
int ret = -EINVAL;
mutex_lock(&event_mutex);
- list_for_each_entry(event, &ftrace_events, list) {
- if (event->event.type == event_id &&
- event->class && event->class->perf_probe &&
- try_module_get(event->mod)) {
- ret = perf_trace_event_enable(event);
+ list_for_each_entry(tp_event, &ftrace_events, list) {
- if (tp_event->id == event_id && tp_event->perf_event_enable &&
++ if (tp_event->event.type == event_id &&
++ tp_event->class && tp_event->class->perf_probe &&
+ try_module_get(tp_event->mod)) {
+ ret = perf_trace_event_init(tp_event, p_event);
break;
}
}
return ret;
}
- static void perf_trace_event_disable(struct ftrace_event_call *event)
+ int perf_trace_enable(struct perf_event *p_event)
{
- char *buf, *nmi_buf;
-
- if (--event->perf_refcount > 0)
- return;
-
- if (event->class->reg)
- event->class->reg(event, TRACE_REG_PERF_UNREGISTER);
- else
- tracepoint_probe_unregister(event->name, event->class->perf_probe, event);
+ struct ftrace_event_call *tp_event = p_event->tp_event;
+ struct hlist_head *list;
- if (!--total_ref_count) {
- buf = perf_trace_buf;
- rcu_assign_pointer(perf_trace_buf, NULL);
+ list = tp_event->perf_events;
+ if (WARN_ON_ONCE(!list))
+ return -EINVAL;
- nmi_buf = perf_trace_buf_nmi;
- rcu_assign_pointer(perf_trace_buf_nmi, NULL);
+ list = per_cpu_ptr(list, smp_processor_id());
+ hlist_add_head_rcu(&p_event->hlist_entry, list);
- /*
- * Ensure every events in profiling have finished before
- * releasing the buffers
- */
- synchronize_sched();
+ return 0;
+ }
- free_percpu(buf);
- free_percpu(nmi_buf);
- }
+ void perf_trace_disable(struct perf_event *p_event)
+ {
+ hlist_del_rcu(&p_event->hlist_entry);
}
- void perf_trace_disable(int event_id)
+ void perf_trace_destroy(struct perf_event *p_event)
{
- struct ftrace_event_call *event;
+ struct ftrace_event_call *tp_event = p_event->tp_event;
+ int i;
- mutex_lock(&event_mutex);
- list_for_each_entry(event, &ftrace_events, list) {
- if (event->event.type == event_id) {
- perf_trace_event_disable(event);
- module_put(event->mod);
- break;
+ if (--tp_event->perf_refcount > 0)
+ return;
+
- tp_event->perf_event_disable(tp_event);
++ if (tp_event->class->reg)
++ tp_event->class->reg(tp_event, TRACE_REG_PERF_UNREGISTER);
++ else
++ tracepoint_probe_unregister(tp_event->name,
++ tp_event->class->perf_probe,
++ tp_event);
+
+ free_percpu(tp_event->perf_events);
+ tp_event->perf_events = NULL;
+
+ if (!--total_ref_count) {
+ for (i = 0; i < 4; i++) {
+ free_percpu(perf_trace_buf[i]);
+ perf_trace_buf[i] = NULL;
}
}
- mutex_unlock(&event_mutex);
}
__kprobes void *perf_trace_buf_prepare(int size, unsigned short type,
git://ftp.safe.ca / safe / jmp / linux-2.6 / commitdiff