tracing: Move the perf code out of trace_event.h
The trace_event.h file is for the generic trace event code. Move
the perf related code into its own trace header file perf.h
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
diff --git a/include/trace/perf.h b/include/trace/perf.h
new file mode 100644
index 0000000..5e82add
--- /dev/null
+++ b/include/trace/perf.h
@@ -0,0 +1,350 @@
+/*
+ * Stage 4 of the trace events.
+ *
+ * Override the macros in <trace/trace_events.h> to include the following:
+ *
+ * For those macros defined with TRACE_EVENT:
+ *
+ * static struct ftrace_event_call event_<call>;
+ *
+ * static void ftrace_raw_event_<call>(void *__data, proto)
+ * {
+ * struct ftrace_event_file *ftrace_file = __data;
+ * struct ftrace_event_call *event_call = ftrace_file->event_call;
+ * struct ftrace_data_offsets_<call> __maybe_unused __data_offsets;
+ * unsigned long eflags = ftrace_file->flags;
+ * enum event_trigger_type __tt = ETT_NONE;
+ * struct ring_buffer_event *event;
+ * struct ftrace_raw_<call> *entry; <-- defined in stage 1
+ * struct ring_buffer *buffer;
+ * unsigned long irq_flags;
+ * int __data_size;
+ * int pc;
+ *
+ * if (!(eflags & FTRACE_EVENT_FL_TRIGGER_COND)) {
+ * if (eflags & FTRACE_EVENT_FL_TRIGGER_MODE)
+ * event_triggers_call(ftrace_file, NULL);
+ * if (eflags & FTRACE_EVENT_FL_SOFT_DISABLED)
+ * return;
+ * }
+ *
+ * local_save_flags(irq_flags);
+ * pc = preempt_count();
+ *
+ * __data_size = ftrace_get_offsets_<call>(&__data_offsets, args);
+ *
+ * event = trace_event_buffer_lock_reserve(&buffer, ftrace_file,
+ * event_<call>->event.type,
+ * sizeof(*entry) + __data_size,
+ * irq_flags, pc);
+ * if (!event)
+ * return;
+ * entry = ring_buffer_event_data(event);
+ *
+ * { <assign>; } <-- Here we assign the entries by the __field and
+ * __array macros.
+ *
+ * if (eflags & FTRACE_EVENT_FL_TRIGGER_COND)
+ * __tt = event_triggers_call(ftrace_file, entry);
+ *
+ * if (test_bit(FTRACE_EVENT_FL_SOFT_DISABLED_BIT,
+ * &ftrace_file->flags))
+ * ring_buffer_discard_commit(buffer, event);
+ * else if (!filter_check_discard(ftrace_file, entry, buffer, event))
+ * trace_buffer_unlock_commit(buffer, event, irq_flags, pc);
+ *
+ * if (__tt)
+ * event_triggers_post_call(ftrace_file, __tt);
+ * }
+ *
+ * static struct trace_event ftrace_event_type_<call> = {
+ * .trace = ftrace_raw_output_<call>, <-- stage 2
+ * };
+ *
+ * static char print_fmt_<call>[] = <TP_printk>;
+ *
+ * static struct ftrace_event_class __used event_class_<template> = {
+ * .system = "<system>",
+ * .define_fields = ftrace_define_fields_<call>,
+ * .fields = LIST_HEAD_INIT(event_class_##call.fields),
+ * .raw_init = trace_event_raw_init,
+ * .probe = ftrace_raw_event_##call,
+ * .reg = ftrace_event_reg,
+ * };
+ *
+ * static struct ftrace_event_call event_<call> = {
+ * .class = event_class_<template>,
+ * {
+ * .tp = &__tracepoint_<call>,
+ * },
+ * .event = &ftrace_event_type_<call>,
+ * .print_fmt = print_fmt_<call>,
+ * .flags = TRACE_EVENT_FL_TRACEPOINT,
+ * };
+ * // its only safe to use pointers when doing linker tricks to
+ * // create an array.
+ * static struct ftrace_event_call __used
+ * __attribute__((section("_ftrace_events"))) *__event_<call> = &event_<call>;
+ *
+ */
+
+#ifdef CONFIG_PERF_EVENTS
+
+#define _TRACE_PERF_PROTO(call, proto) \
+ static notrace void \
+ perf_trace_##call(void *__data, proto);
+
+#define _TRACE_PERF_INIT(call) \
+ .perf_probe = perf_trace_##call,
+
+#else
+#define _TRACE_PERF_PROTO(call, proto)
+#define _TRACE_PERF_INIT(call)
+#endif /* CONFIG_PERF_EVENTS */
+
+#undef __entry
+#define __entry entry
+
+#undef __field
+#define __field(type, item)
+
+#undef __field_struct
+#define __field_struct(type, item)
+
+#undef __array
+#define __array(type, item, len)
+
+#undef __dynamic_array
+#define __dynamic_array(type, item, len) \
+ __entry->__data_loc_##item = __data_offsets.item;
+
+#undef __string
+#define __string(item, src) __dynamic_array(char, item, -1)
+
+#undef __assign_str
+#define __assign_str(dst, src) \
+ strcpy(__get_str(dst), (src) ? (const char *)(src) : "(null)");
+
+#undef __bitmask
+#define __bitmask(item, nr_bits) __dynamic_array(unsigned long, item, -1)
+
+#undef __get_bitmask
+#define __get_bitmask(field) (char *)__get_dynamic_array(field)
+
+#undef __assign_bitmask
+#define __assign_bitmask(dst, src, nr_bits) \
+ memcpy(__get_bitmask(dst), (src), __bitmask_size_in_bytes(nr_bits))
+
+#undef TP_fast_assign
+#define TP_fast_assign(args...) args
+
+#undef __perf_addr
+#define __perf_addr(a) (a)
+
+#undef __perf_count
+#define __perf_count(c) (c)
+
+#undef __perf_task
+#define __perf_task(t) (t)
+
+#undef DECLARE_EVENT_CLASS
+#define DECLARE_EVENT_CLASS(call, proto, args, tstruct, assign, print) \
+ \
+static notrace void \
+ftrace_raw_event_##call(void *__data, proto) \
+{ \
+ struct ftrace_event_file *ftrace_file = __data; \
+ struct ftrace_data_offsets_##call __maybe_unused __data_offsets;\
+ struct ftrace_event_buffer fbuffer; \
+ struct ftrace_raw_##call *entry; \
+ int __data_size; \
+ \
+ if (ftrace_trigger_soft_disabled(ftrace_file)) \
+ return; \
+ \
+ __data_size = ftrace_get_offsets_##call(&__data_offsets, args); \
+ \
+ entry = ftrace_event_buffer_reserve(&fbuffer, ftrace_file, \
+ sizeof(*entry) + __data_size); \
+ \
+ if (!entry) \
+ return; \
+ \
+ tstruct \
+ \
+ { assign; } \
+ \
+ ftrace_event_buffer_commit(&fbuffer); \
+}
+/*
+ * The ftrace_test_probe is compiled out, it is only here as a build time check
+ * to make sure that if the tracepoint handling changes, the ftrace probe will
+ * fail to compile unless it too is updated.
+ */
+
+#undef DEFINE_EVENT
+#define DEFINE_EVENT(template, call, proto, args) \
+static inline void ftrace_test_probe_##call(void) \
+{ \
+ check_trace_callback_type_##call(ftrace_raw_event_##template); \
+}
+
+#undef DEFINE_EVENT_PRINT
+#define DEFINE_EVENT_PRINT(template, name, proto, args, print)
+
+#include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
+
+#undef __entry
+#define __entry REC
+
+#undef __print_flags
+#undef __print_symbolic
+#undef __print_hex
+#undef __get_dynamic_array
+#undef __get_dynamic_array_len
+#undef __get_str
+#undef __get_bitmask
+#undef __print_array
+
+#undef TP_printk
+#define TP_printk(fmt, args...) "\"" fmt "\", " __stringify(args)
+
+#undef DECLARE_EVENT_CLASS
+#define DECLARE_EVENT_CLASS(call, proto, args, tstruct, assign, print) \
+_TRACE_PERF_PROTO(call, PARAMS(proto)); \
+static char print_fmt_##call[] = print; \
+static struct ftrace_event_class __used __refdata event_class_##call = { \
+ .system = TRACE_SYSTEM_STRING, \
+ .define_fields = ftrace_define_fields_##call, \
+ .fields = LIST_HEAD_INIT(event_class_##call.fields),\
+ .raw_init = trace_event_raw_init, \
+ .probe = ftrace_raw_event_##call, \
+ .reg = ftrace_event_reg, \
+ _TRACE_PERF_INIT(call) \
+};
+
+#undef DEFINE_EVENT
+#define DEFINE_EVENT(template, call, proto, args) \
+ \
+static struct ftrace_event_call __used event_##call = { \
+ .class = &event_class_##template, \
+ { \
+ .tp = &__tracepoint_##call, \
+ }, \
+ .event.funcs = &ftrace_event_type_funcs_##template, \
+ .print_fmt = print_fmt_##template, \
+ .flags = TRACE_EVENT_FL_TRACEPOINT, \
+}; \
+static struct ftrace_event_call __used \
+__attribute__((section("_ftrace_events"))) *__event_##call = &event_##call
+
+#undef DEFINE_EVENT_PRINT
+#define DEFINE_EVENT_PRINT(template, call, proto, args, print) \
+ \
+static char print_fmt_##call[] = print; \
+ \
+static struct ftrace_event_call __used event_##call = { \
+ .class = &event_class_##template, \
+ { \
+ .tp = &__tracepoint_##call, \
+ }, \
+ .event.funcs = &ftrace_event_type_funcs_##call, \
+ .print_fmt = print_fmt_##call, \
+ .flags = TRACE_EVENT_FL_TRACEPOINT, \
+}; \
+static struct ftrace_event_call __used \
+__attribute__((section("_ftrace_events"))) *__event_##call = &event_##call
+
+#include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
+
+#undef TRACE_SYSTEM_VAR
+
+#ifdef CONFIG_PERF_EVENTS
+
+#undef __entry
+#define __entry entry
+
+#undef __get_dynamic_array
+#define __get_dynamic_array(field) \
+ ((void *)__entry + (__entry->__data_loc_##field & 0xffff))
+
+#undef __get_dynamic_array_len
+#define __get_dynamic_array_len(field) \
+ ((__entry->__data_loc_##field >> 16) & 0xffff)
+
+#undef __get_str
+#define __get_str(field) (char *)__get_dynamic_array(field)
+
+#undef __get_bitmask
+#define __get_bitmask(field) (char *)__get_dynamic_array(field)
+
+#undef __perf_addr
+#define __perf_addr(a) (__addr = (a))
+
+#undef __perf_count
+#define __perf_count(c) (__count = (c))
+
+#undef __perf_task
+#define __perf_task(t) (__task = (t))
+
+#undef DECLARE_EVENT_CLASS
+#define DECLARE_EVENT_CLASS(call, proto, args, tstruct, assign, print) \
+static notrace void \
+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; \
+ u64 __addr = 0, __count = 1; \
+ struct task_struct *__task = NULL; \
+ struct hlist_head *head; \
+ int __entry_size; \
+ int __data_size; \
+ int rctx; \
+ \
+ __data_size = ftrace_get_offsets_##call(&__data_offsets, args); \
+ \
+ head = this_cpu_ptr(event_call->perf_events); \
+ if (__builtin_constant_p(!__task) && !__task && \
+ hlist_empty(head)) \
+ return; \
+ \
+ __entry_size = ALIGN(__data_size + sizeof(*entry) + sizeof(u32),\
+ sizeof(u64)); \
+ __entry_size -= sizeof(u32); \
+ \
+ entry = perf_trace_buf_prepare(__entry_size, \
+ event_call->event.type, &__regs, &rctx); \
+ if (!entry) \
+ return; \
+ \
+ perf_fetch_caller_regs(__regs); \
+ \
+ tstruct \
+ \
+ { assign; } \
+ \
+ perf_trace_buf_submit(entry, __entry_size, rctx, __addr, \
+ __count, __regs, head, __task); \
+}
+
+/*
+ * 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 inline void perf_test_probe_##call(void) \
+{ \
+ 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))
+
+#include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
+#endif /* CONFIG_PERF_EVENTS */