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Message-Id: <163697161857.131454.12959552034913725926.stgit@devnote2>
Date: Mon, 15 Nov 2021 19:20:18 +0900
From: Masami Hiramatsu <mhiramat@...nel.org>
To: Steven Rostedt <rostedt@...dmis.org>,
Beau Belgrave <beaub@...ux.microsoft.com>
Cc: linux-kernel@...r.kernel.org,
Masami Hiramatsu <mhiramat@...nel.org>,
Namhyung Kim <namhyung@...nel.org>,
Tom Zanussi <zanussi@...nel.org>
Subject: [PATCH 2/5] tracing: Add '__rel_loc' using trace event macros
Add '__rel_loc' using trace event macros. These macros
are usually not used in the kernel, except for testing
purpose.
Signed-off-by: Masami Hiramatsu <mhiramat@...nel.org>
---
include/trace/bpf_probe.h | 13 +++++++
include/trace/perf.h | 13 +++++++
include/trace/trace_events.h | 83 ++++++++++++++++++++++++++++++++++++++++++
kernel/trace/trace.h | 3 ++
4 files changed, 112 insertions(+)
diff --git a/include/trace/bpf_probe.h b/include/trace/bpf_probe.h
index a23be89119aa..ff40ec0c887d 100644
--- a/include/trace/bpf_probe.h
+++ b/include/trace/bpf_probe.h
@@ -18,6 +18,19 @@
#undef __get_str
#define __get_str(field) ((char *)__get_dynamic_array(field))
+#undef __get_rel_dynamic_array
+#define __get_rel_dynamic_array(field) \
+ ((void *)(&__entry->__rel_loc_##field) + \
+ sizeof(__entry->__rel_loc_##field) + \
+ (__entry->__rel_loc_##field & 0xffff))
+
+#undef __get_rel_dynamic_array_len
+#define __get_rel_dynamic_array_len(field) \
+ ((__entry->__rel_loc_##field >> 16) & 0xffff)
+
+#undef __get_rel_str
+#define __get_rel_str(field) ((char *)__get_rel_dynamic_array(field))
+
#undef __get_bitmask
#define __get_bitmask(field) (char *)__get_dynamic_array(field)
diff --git a/include/trace/perf.h b/include/trace/perf.h
index dbc6c74defc3..06cee508bdfa 100644
--- a/include/trace/perf.h
+++ b/include/trace/perf.h
@@ -18,6 +18,19 @@
#undef __get_str
#define __get_str(field) ((char *)__get_dynamic_array(field))
+#undef __get_rel_dynamic_array
+#define __get_rel_dynamic_array(field) \
+ ((void *)(&__entry->__rel_loc_##field) + \
+ sizeof(__entry->__rel_loc_##field) + \
+ (__entry->__rel_loc_##field & 0xffff))
+
+#undef __get_rel_dynamic_array_len
+#define __get_rel_dynamic_array_len(field) \
+ ((__entry->__rel_loc_##field >> 16) & 0xffff)
+
+#undef __get_rel_str
+#define __get_rel_str(field) ((char *)__get_rel_dynamic_array(field))
+
#undef __get_bitmask
#define __get_bitmask(field) (char *)__get_dynamic_array(field)
diff --git a/include/trace/trace_events.h b/include/trace/trace_events.h
index 08810a463880..6a730164479f 100644
--- a/include/trace/trace_events.h
+++ b/include/trace/trace_events.h
@@ -105,6 +105,15 @@ TRACE_MAKE_SYSTEM_STR();
#undef __string_len
#define __string_len(item, src, len) __dynamic_array(char, item, -1)
+#undef __rel_dynamic_array
+#define __rel_dynamic_array(type, item, len) u32 __rel_loc_##item;
+
+#undef __rel_string
+#define __rel_string(item, src) __rel_dynamic_array(char, item, -1)
+
+#undef __rel_string_len
+#define __rel_string_len(item, src, len) __rel_dynamic_array(char, item, -1)
+
#undef __bitmask
#define __bitmask(item, nr_bits) __dynamic_array(char, item, -1)
@@ -203,6 +212,15 @@ TRACE_MAKE_SYSTEM_STR();
#undef __string_len
#define __string_len(item, src, len) __dynamic_array(char, item, -1)
+#undef __rel_dynamic_array
+#define __rel_dynamic_array(type, item, len) u32 item;
+
+#undef __rel_string
+#define __rel_string(item, src) __rel_dynamic_array(char, item, -1)
+
+#undef __rel_string_len
+#define __rel_string_len(item, src, len) __rel_dynamic_array(char, item, -1)
+
#undef __bitmask
#define __bitmask(item, nr_bits) __dynamic_array(unsigned long, item, -1)
@@ -293,6 +311,19 @@ TRACE_MAKE_SYSTEM_STR();
#undef __get_str
#define __get_str(field) ((char *)__get_dynamic_array(field))
+#undef __get_rel_dynamic_array
+#define __get_rel_dynamic_array(field) \
+ ((void *)(&__entry->__rel_loc_##field) + \
+ sizeof(__entry->__rel_loc_##field) + \
+ (__entry->__rel_loc_##field & 0xffff))
+
+#undef __get_rel_dynamic_array_len
+#define __get_rel_dynamic_array_len(field) \
+ ((__entry->__rel_loc_##field >> 16) & 0xffff)
+
+#undef __get_rel_str
+#define __get_rel_str(field) ((char *)__get_rel_dynamic_array(field))
+
#undef __get_bitmask
#define __get_bitmask(field) \
({ \
@@ -468,6 +499,18 @@ static struct trace_event_functions trace_event_type_funcs_##call = { \
#undef __string_len
#define __string_len(item, src, len) __dynamic_array(char, item, -1)
+#undef __rel_dynamic_array
+#define __rel_dynamic_array(_type, _item, _len) { \
+ .type = "__rel_loc " #_type "[]", .name = #_item, \
+ .size = 4, .align = 4, \
+ .is_signed = is_signed_type(_type), .filter_type = FILTER_OTHER },
+
+#undef __rel_string
+#define __rel_string(item, src) __rel_dynamic_array(char, item, -1)
+
+#undef __rel_string_len
+#define __rel_string_len(item, src, len) __rel_dynamic_array(char, item, -1)
+
#undef __bitmask
#define __bitmask(item, nr_bits) __dynamic_array(unsigned long, item, -1)
@@ -519,6 +562,22 @@ static struct trace_event_fields trace_event_fields_##call[] = { \
#undef __string_len
#define __string_len(item, src, len) __dynamic_array(char, item, (len) + 1)
+#undef __rel_dynamic_array
+#define __rel_dynamic_array(type, item, len) \
+ __item_length = (len) * sizeof(type); \
+ __data_offsets->item = __data_size + \
+ offsetof(typeof(*entry), __data) - \
+ offsetof(typeof(*entry), __rel_loc_##item) - \
+ sizeof(u32); \
+ __data_offsets->item |= __item_length << 16; \
+ __data_size += __item_length;
+
+#undef __rel_string
+#define __rel_string(item, src) __rel_dynamic_array(char, item, \
+ strlen((src) ? (const char *)(src) : "(null)") + 1)
+
+#undef __rel_string_len
+#define __rel_string_len(item, src, len) __rel_dynamic_array(char, item, (len) + 1)
/*
* __bitmask_size_in_bytes_raw is the number of bytes needed to hold
* num_possible_cpus().
@@ -696,6 +755,27 @@ static inline notrace int trace_event_get_offsets_##call( \
__get_str(dst)[len] = '\0'; \
} while(0)
+#undef __rel_dynamic_array
+#define __rel_dynamic_array(type, item, len) \
+ __entry->__rel_loc_##item = __data_offsets.item;
+
+#undef __rel_string
+#define __rel_string(item, src) __rel_dynamic_array(char, item, -1)
+
+#undef __rel_string_len
+#define __rel_string_len(item, src, len) __rel_dynamic_array(char, item, -1)
+
+#undef __assign_rel_str
+#define __assign_rel_str(dst, src) \
+ strcpy(__get_rel_str(dst), (src) ? (const char *)(src) : "(null)");
+
+#undef __assign_rel_str_len
+#define __assign_rel_str_len(dst, src, len) \
+ do { \
+ memcpy(__get_rel_str(dst), (src), (len)); \
+ __get_rel_str(dst)[len] = '\0'; \
+ } while (0)
+
#undef __bitmask
#define __bitmask(item, nr_bits) __dynamic_array(unsigned long, item, -1)
@@ -769,6 +849,9 @@ static inline void ftrace_test_probe_##call(void) \
#undef __get_dynamic_array
#undef __get_dynamic_array_len
#undef __get_str
+#undef __get_rel_dynamic_array
+#undef __get_rel_dynamic_array_len
+#undef __get_rel_str
#undef __get_bitmask
#undef __print_array
#undef __print_hex_dump
diff --git a/kernel/trace/trace.h b/kernel/trace/trace.h
index 4fd292c3a062..f80d5612701e 100644
--- a/kernel/trace/trace.h
+++ b/kernel/trace/trace.h
@@ -83,6 +83,9 @@ enum trace_type {
#undef __dynamic_array
#define __dynamic_array(type, item) type item[];
+#undef __rel_dynamic_array
+#define __rel_dynamic_array(type, item) type item[];
+
#undef F_STRUCT
#define F_STRUCT(args...) args
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