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-rw-r--r--include/trace/trace_custom_events.h221
1 files changed, 221 insertions, 0 deletions
diff --git a/include/trace/trace_custom_events.h b/include/trace/trace_custom_events.h
new file mode 100644
index 000000000..6e492dba9
--- /dev/null
+++ b/include/trace/trace_custom_events.h
@@ -0,0 +1,221 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * This is similar to the trace_events.h file, but is to only
+ * create custom trace events to be attached to existing tracepoints.
+ * Where as the TRACE_EVENT() macro (from trace_events.h) will create
+ * both the trace event and the tracepoint it will attach the event to,
+ * TRACE_CUSTOM_EVENT() is to create only a custom version of an existing
+ * trace event (created by TRACE_EVENT() or DEFINE_EVENT()), and will
+ * be placed in the "custom" system.
+ */
+
+#include <linux/trace_events.h>
+
+/* All custom events are placed in the custom group */
+#undef TRACE_SYSTEM
+#define TRACE_SYSTEM custom
+
+#ifndef TRACE_SYSTEM_VAR
+#define TRACE_SYSTEM_VAR TRACE_SYSTEM
+#endif
+
+/* The init stage creates the system string and enum mappings */
+
+#include "stages/init.h"
+
+#undef TRACE_CUSTOM_EVENT
+#define TRACE_CUSTOM_EVENT(name, proto, args, tstruct, assign, print) \
+ DECLARE_CUSTOM_EVENT_CLASS(name, \
+ PARAMS(proto), \
+ PARAMS(args), \
+ PARAMS(tstruct), \
+ PARAMS(assign), \
+ PARAMS(print)); \
+ DEFINE_CUSTOM_EVENT(name, name, PARAMS(proto), PARAMS(args));
+
+/* Stage 1 creates the structure of the recorded event layout */
+
+#include "stages/stage1_struct_define.h"
+
+#undef DECLARE_CUSTOM_EVENT_CLASS
+#define DECLARE_CUSTOM_EVENT_CLASS(name, proto, args, tstruct, assign, print) \
+ struct trace_custom_event_raw_##name { \
+ struct trace_entry ent; \
+ tstruct \
+ char __data[]; \
+ }; \
+ \
+ static struct trace_event_class custom_event_class_##name;
+
+#undef DEFINE_CUSTOM_EVENT
+#define DEFINE_CUSTOM_EVENT(template, name, proto, args) \
+ static struct trace_event_call __used \
+ __attribute__((__aligned__(4))) custom_event_##name
+
+#include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
+
+/* Stage 2 creates the custom class */
+
+#include "stages/stage2_data_offsets.h"
+
+#undef DECLARE_CUSTOM_EVENT_CLASS
+#define DECLARE_CUSTOM_EVENT_CLASS(call, proto, args, tstruct, assign, print) \
+ struct trace_custom_event_data_offsets_##call { \
+ tstruct; \
+ };
+
+#undef DEFINE_CUSTOM_EVENT
+#define DEFINE_CUSTOM_EVENT(template, name, proto, args)
+
+#include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
+
+/* Stage 3 create the way to print the custom event */
+
+#include "stages/stage3_trace_output.h"
+
+#undef DECLARE_CUSTOM_EVENT_CLASS
+#define DECLARE_CUSTOM_EVENT_CLASS(call, proto, args, tstruct, assign, print) \
+static notrace enum print_line_t \
+trace_custom_raw_output_##call(struct trace_iterator *iter, int flags, \
+ struct trace_event *trace_event) \
+{ \
+ struct trace_seq *s = &iter->seq; \
+ struct trace_seq __maybe_unused *p = &iter->tmp_seq; \
+ struct trace_custom_event_raw_##call *field; \
+ int ret; \
+ \
+ field = (typeof(field))iter->ent; \
+ \
+ ret = trace_raw_output_prep(iter, trace_event); \
+ if (ret != TRACE_TYPE_HANDLED) \
+ return ret; \
+ \
+ trace_event_printf(iter, print); \
+ \
+ return trace_handle_return(s); \
+} \
+static struct trace_event_functions trace_custom_event_type_funcs_##call = { \
+ .trace = trace_custom_raw_output_##call, \
+};
+
+#include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
+
+/* Stage 4 creates the offset layout for the fields */
+
+#include "stages/stage4_event_fields.h"
+
+#undef DECLARE_CUSTOM_EVENT_CLASS
+#define DECLARE_CUSTOM_EVENT_CLASS(call, proto, args, tstruct, func, print) \
+static struct trace_event_fields trace_custom_event_fields_##call[] = { \
+ tstruct \
+ {} };
+
+#include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
+
+/* Stage 5 creates the helper function for dynamic fields */
+
+#include "stages/stage5_get_offsets.h"
+
+#undef DECLARE_CUSTOM_EVENT_CLASS
+#define DECLARE_CUSTOM_EVENT_CLASS(call, proto, args, tstruct, assign, print) \
+static inline notrace int trace_custom_event_get_offsets_##call( \
+ struct trace_custom_event_data_offsets_##call *__data_offsets, proto) \
+{ \
+ int __data_size = 0; \
+ int __maybe_unused __item_length; \
+ struct trace_custom_event_raw_##call __maybe_unused *entry; \
+ \
+ tstruct; \
+ \
+ return __data_size; \
+}
+
+#include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
+
+/* Stage 6 creates the probe function that records the event */
+
+#include "stages/stage6_event_callback.h"
+
+#undef DECLARE_CUSTOM_EVENT_CLASS
+#define DECLARE_CUSTOM_EVENT_CLASS(call, proto, args, tstruct, assign, print) \
+ \
+static notrace void \
+trace_custom_event_raw_event_##call(void *__data, proto) \
+{ \
+ struct trace_event_file *trace_file = __data; \
+ struct trace_custom_event_data_offsets_##call __maybe_unused __data_offsets; \
+ struct trace_event_buffer fbuffer; \
+ struct trace_custom_event_raw_##call *entry; \
+ int __data_size; \
+ \
+ if (trace_trigger_soft_disabled(trace_file)) \
+ return; \
+ \
+ __data_size = trace_custom_event_get_offsets_##call(&__data_offsets, args); \
+ \
+ entry = trace_event_buffer_reserve(&fbuffer, trace_file, \
+ sizeof(*entry) + __data_size); \
+ \
+ if (!entry) \
+ return; \
+ \
+ tstruct \
+ \
+ { assign; } \
+ \
+ trace_event_buffer_commit(&fbuffer); \
+}
+/*
+ * The ftrace_test_custom_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_CUSTOM_EVENT
+#define DEFINE_CUSTOM_EVENT(template, call, proto, args) \
+static inline void ftrace_test_custom_probe_##call(void) \
+{ \
+ check_trace_callback_type_##call(trace_custom_event_raw_event_##template); \
+}
+
+#include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
+
+/* Stage 7 creates the actual class and event structure for the custom event */
+
+#include "stages/stage7_class_define.h"
+
+#undef DECLARE_CUSTOM_EVENT_CLASS
+#define DECLARE_CUSTOM_EVENT_CLASS(call, proto, args, tstruct, assign, print) \
+static char custom_print_fmt_##call[] = print; \
+static struct trace_event_class __used __refdata custom_event_class_##call = { \
+ .system = TRACE_SYSTEM_STRING, \
+ .fields_array = trace_custom_event_fields_##call, \
+ .fields = LIST_HEAD_INIT(custom_event_class_##call.fields),\
+ .raw_init = trace_event_raw_init, \
+ .probe = trace_custom_event_raw_event_##call, \
+ .reg = trace_event_reg, \
+};
+
+#undef DEFINE_CUSTOM_EVENT
+#define DEFINE_CUSTOM_EVENT(template, call, proto, args) \
+ \
+static struct trace_event_call __used custom_event_##call = { \
+ .name = #call, \
+ .class = &custom_event_class_##template, \
+ .event.funcs = &trace_custom_event_type_funcs_##template, \
+ .print_fmt = custom_print_fmt_##template, \
+ .flags = TRACE_EVENT_FL_CUSTOM, \
+}; \
+static inline int trace_custom_event_##call##_update(struct tracepoint *tp) \
+{ \
+ if (tp->name && strcmp(tp->name, #call) == 0) { \
+ custom_event_##call.tp = tp; \
+ custom_event_##call.flags = TRACE_EVENT_FL_TRACEPOINT; \
+ return 1; \
+ } \
+ return 0; \
+} \
+static struct trace_event_call __used \
+__section("_ftrace_events") *__custom_event_##call = &custom_event_##call
+
+#include TRACE_INCLUDE(TRACE_INCLUDE_FILE)