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@@ -506,3 +506,261 @@ static inline notrace int trace_event_get_offsets_##call( \
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#include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
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+/*
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+ * Stage 4 of the trace events.
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+ *
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+ * Override the macros in <trace/trace_events.h> to include the following:
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+ *
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+ * For those macros defined with TRACE_EVENT:
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+ *
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+ * static struct trace_event_call event_<call>;
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+ *
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+ * static void trace_event_raw_event_<call>(void *__data, proto)
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+ * {
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+ * struct trace_event_file *trace_file = __data;
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+ * struct trace_event_call *event_call = trace_file->event_call;
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+ * struct trace_event_data_offsets_<call> __maybe_unused __data_offsets;
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+ * unsigned long eflags = trace_file->flags;
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+ * enum event_trigger_type __tt = ETT_NONE;
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+ * struct ring_buffer_event *event;
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+ * struct trace_event_raw_<call> *entry; <-- defined in stage 1
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+ * struct ring_buffer *buffer;
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+ * unsigned long irq_flags;
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+ * int __data_size;
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+ * int pc;
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+ *
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+ * if (!(eflags & EVENT_FILE_FL_TRIGGER_COND)) {
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+ * if (eflags & EVENT_FILE_FL_TRIGGER_MODE)
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+ * event_triggers_call(trace_file, NULL);
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+ * if (eflags & EVENT_FILE_FL_SOFT_DISABLED)
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+ * return;
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+ * }
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+ *
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+ * local_save_flags(irq_flags);
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+ * pc = preempt_count();
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+ *
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+ * __data_size = trace_event_get_offsets_<call>(&__data_offsets, args);
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+ *
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+ * event = trace_event_buffer_lock_reserve(&buffer, trace_file,
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+ * event_<call>->event.type,
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+ * sizeof(*entry) + __data_size,
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+ * irq_flags, pc);
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+ * if (!event)
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+ * return;
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+ * entry = ring_buffer_event_data(event);
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+ *
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+ * { <assign>; } <-- Here we assign the entries by the __field and
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+ * __array macros.
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+ *
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+ * if (eflags & EVENT_FILE_FL_TRIGGER_COND)
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+ * __tt = event_triggers_call(trace_file, entry);
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+ *
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+ * if (test_bit(EVENT_FILE_FL_SOFT_DISABLED_BIT,
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+ * &trace_file->flags))
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+ * ring_buffer_discard_commit(buffer, event);
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+ * else if (!filter_check_discard(trace_file, entry, buffer, event))
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+ * trace_buffer_unlock_commit(buffer, event, irq_flags, pc);
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+ *
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+ * if (__tt)
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+ * event_triggers_post_call(trace_file, __tt);
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+ * }
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+ *
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+ * static struct trace_event ftrace_event_type_<call> = {
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+ * .trace = trace_raw_output_<call>, <-- stage 2
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+ * };
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+ *
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+ * static char print_fmt_<call>[] = <TP_printk>;
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+ *
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+ * static struct trace_event_class __used event_class_<template> = {
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+ * .system = "<system>",
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+ * .define_fields = trace_event_define_fields_<call>,
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+ * .fields = LIST_HEAD_INIT(event_class_##call.fields),
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+ * .raw_init = trace_event_raw_init,
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+ * .probe = trace_event_raw_event_##call,
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+ * .reg = trace_event_reg,
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+ * };
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+ *
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+ * static struct trace_event_call event_<call> = {
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+ * .class = event_class_<template>,
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+ * {
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+ * .tp = &__tracepoint_<call>,
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+ * },
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+ * .event = &ftrace_event_type_<call>,
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+ * .print_fmt = print_fmt_<call>,
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+ * .flags = TRACE_EVENT_FL_TRACEPOINT,
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+ * };
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+ * // its only safe to use pointers when doing linker tricks to
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+ * // create an array.
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+ * static struct trace_event_call __used
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+ * __attribute__((section("_ftrace_events"))) *__event_<call> = &event_<call>;
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+ *
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+ */
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+
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+#ifdef CONFIG_PERF_EVENTS
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+
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+#define _TRACE_PERF_PROTO(call, proto) \
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+ static notrace void \
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+ perf_trace_##call(void *__data, proto);
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+
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+#define _TRACE_PERF_INIT(call) \
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+ .perf_probe = perf_trace_##call,
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+
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+#else
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+#define _TRACE_PERF_PROTO(call, proto)
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+#define _TRACE_PERF_INIT(call)
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+#endif /* CONFIG_PERF_EVENTS */
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+
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+#undef __entry
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+#define __entry entry
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+
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+#undef __field
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+#define __field(type, item)
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+
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+#undef __field_struct
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+#define __field_struct(type, item)
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+
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+#undef __array
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+#define __array(type, item, len)
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+
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+#undef __dynamic_array
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+#define __dynamic_array(type, item, len) \
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+ __entry->__data_loc_##item = __data_offsets.item;
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+
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+#undef __string
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+#define __string(item, src) __dynamic_array(char, item, -1)
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+
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+#undef __assign_str
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+#define __assign_str(dst, src) \
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+ strcpy(__get_str(dst), (src) ? (const char *)(src) : "(null)");
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+
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+#undef __bitmask
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+#define __bitmask(item, nr_bits) __dynamic_array(unsigned long, item, -1)
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+
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+#undef __get_bitmask
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+#define __get_bitmask(field) (char *)__get_dynamic_array(field)
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+
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+#undef __assign_bitmask
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+#define __assign_bitmask(dst, src, nr_bits) \
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+ memcpy(__get_bitmask(dst), (src), __bitmask_size_in_bytes(nr_bits))
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+
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+#undef TP_fast_assign
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+#define TP_fast_assign(args...) args
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+
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+#undef __perf_addr
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+#define __perf_addr(a) (a)
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+
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+#undef __perf_count
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+#define __perf_count(c) (c)
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+
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+#undef __perf_task
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+#define __perf_task(t) (t)
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+
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+#undef DECLARE_EVENT_CLASS
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+#define DECLARE_EVENT_CLASS(call, proto, args, tstruct, assign, print) \
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+ \
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+static notrace void \
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+trace_event_raw_event_##call(void *__data, proto) \
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+{ \
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+ struct trace_event_file *trace_file = __data; \
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+ struct trace_event_data_offsets_##call __maybe_unused __data_offsets;\
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+ struct trace_event_buffer fbuffer; \
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+ struct trace_event_raw_##call *entry; \
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+ int __data_size; \
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+ \
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+ if (trace_trigger_soft_disabled(trace_file)) \
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+ return; \
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+ \
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+ __data_size = trace_event_get_offsets_##call(&__data_offsets, args); \
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+ \
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+ entry = trace_event_buffer_reserve(&fbuffer, trace_file, \
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+ sizeof(*entry) + __data_size); \
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+ \
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+ if (!entry) \
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+ return; \
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+ \
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+ tstruct \
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+ \
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+ { assign; } \
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+ \
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+ trace_event_buffer_commit(&fbuffer); \
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+}
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+/*
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+ * The ftrace_test_probe is compiled out, it is only here as a build time check
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+ * to make sure that if the tracepoint handling changes, the ftrace probe will
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+ * fail to compile unless it too is updated.
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+ */
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+
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+#undef DEFINE_EVENT
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+#define DEFINE_EVENT(template, call, proto, args) \
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+static inline void ftrace_test_probe_##call(void) \
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+{ \
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+ check_trace_callback_type_##call(trace_event_raw_event_##template); \
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+}
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+
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+#undef DEFINE_EVENT_PRINT
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+#define DEFINE_EVENT_PRINT(template, name, proto, args, print)
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+
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+#include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
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+
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+#undef __entry
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+#define __entry REC
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+
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+#undef __print_flags
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+#undef __print_symbolic
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+#undef __print_hex
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+#undef __get_dynamic_array
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+#undef __get_dynamic_array_len
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+#undef __get_str
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+#undef __get_bitmask
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+#undef __print_array
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+
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+#undef TP_printk
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+#define TP_printk(fmt, args...) "\"" fmt "\", " __stringify(args)
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+
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+#undef DECLARE_EVENT_CLASS
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+#define DECLARE_EVENT_CLASS(call, proto, args, tstruct, assign, print) \
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+_TRACE_PERF_PROTO(call, PARAMS(proto)); \
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+static char print_fmt_##call[] = print; \
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+static struct trace_event_class __used __refdata event_class_##call = { \
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+ .system = TRACE_SYSTEM_STRING, \
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+ .define_fields = trace_event_define_fields_##call, \
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+ .fields = LIST_HEAD_INIT(event_class_##call.fields),\
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+ .raw_init = trace_event_raw_init, \
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+ .probe = trace_event_raw_event_##call, \
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+ .reg = trace_event_reg, \
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+ _TRACE_PERF_INIT(call) \
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+};
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+
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+#undef DEFINE_EVENT
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+#define DEFINE_EVENT(template, call, proto, args) \
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+ \
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+static struct trace_event_call __used event_##call = { \
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+ .class = &event_class_##template, \
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+ { \
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+ .tp = &__tracepoint_##call, \
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+ }, \
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+ .event.funcs = &trace_event_type_funcs_##template, \
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+ .print_fmt = print_fmt_##template, \
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+ .flags = TRACE_EVENT_FL_TRACEPOINT, \
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+}; \
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+static struct trace_event_call __used \
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+__attribute__((section("_ftrace_events"))) *__event_##call = &event_##call
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+
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+#undef DEFINE_EVENT_PRINT
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+#define DEFINE_EVENT_PRINT(template, call, proto, args, print) \
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+ \
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+static char print_fmt_##call[] = print; \
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+ \
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+static struct trace_event_call __used event_##call = { \
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+ .class = &event_class_##template, \
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+ { \
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+ .tp = &__tracepoint_##call, \
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+ }, \
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+ .event.funcs = &trace_event_type_funcs_##call, \
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+ .print_fmt = print_fmt_##call, \
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+ .flags = TRACE_EVENT_FL_TRACEPOINT, \
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+}; \
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+static struct trace_event_call __used \
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+__attribute__((section("_ftrace_events"))) *__event_##call = &event_##call
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+
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+#include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
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Steven Rostedt (Red Hat)