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Masami Hiramatsu (Google) d157d76944 tracing/probes: Support BTF field access from $retval 
Support BTF argument on '$retval' for function return events including
kretprobe and fprobe for accessing the return value.
This also allows user to access its fields if the return value is a
pointer of a data structure.

E.g.
 # echo 'f getname_flags%return +0($retval->name):string' \
   > dynamic_events
 # echo 1 > events/fprobes/getname_flags__exit/enable
 # ls > /dev/null
 # head -n 40 trace | tail
              ls-87      [000] ...1.  8067.616101: getname_flags__exit: (vfs_fstatat+0x3c/0x70 <- getname_flags) arg1="./function_profile_enabled"
              ls-87      [000] ...1.  8067.616108: getname_flags__exit: (vfs_fstatat+0x3c/0x70 <- getname_flags) arg1="./trace_stat"
              ls-87      [000] ...1.  8067.616115: getname_flags__exit: (vfs_fstatat+0x3c/0x70 <- getname_flags) arg1="./set_graph_notrace"
              ls-87      [000] ...1.  8067.616122: getname_flags__exit: (vfs_fstatat+0x3c/0x70 <- getname_flags) arg1="./set_graph_function"
              ls-87      [000] ...1.  8067.616129: getname_flags__exit: (vfs_fstatat+0x3c/0x70 <- getname_flags) arg1="./set_ftrace_notrace"
              ls-87      [000] ...1.  8067.616135: getname_flags__exit: (vfs_fstatat+0x3c/0x70 <- getname_flags) arg1="./set_ftrace_filter"
              ls-87      [000] ...1.  8067.616143: getname_flags__exit: (vfs_fstatat+0x3c/0x70 <- getname_flags) arg1="./touched_functions"
              ls-87      [000] ...1.  8067.616237: getname_flags__exit: (vfs_fstatat+0x3c/0x70 <- getname_flags) arg1="./enabled_functions"
              ls-87      [000] ...1.  8067.616245: getname_flags__exit: (vfs_fstatat+0x3c/0x70 <- getname_flags) arg1="./available_filter_functions"
              ls-87      [000] ...1.  8067.616253: getname_flags__exit: (vfs_fstatat+0x3c/0x70 <- getname_flags) arg1="./set_ftrace_notrace_pid"


Link: https://lore.kernel.org/all/169272158234.160970.2446691104240645205.stgit@devnote2/

Signed-off-by: Masami Hiramatsu (Google) <mhiramat@kernel.org>
Acked-by: Steven Rostedt (Google) <rostedt@goodmis.org>
2023-08-23 09:40:51 +09:00
..
rv
tracing/tools: Updates for 6.4
2023-04-28 16:11:26 -07:00
blktrace.c
block: remove more NULL checks after bdev_get_queue()
2023-02-21 09:23:22 -07:00
bpf_trace.c
bpf: Disable preemption in bpf_event_output
2023-07-25 17:06:37 -07:00
bpf_trace.h
…
error_report-traces.c
…
fgraph.c
tracing: arm64: Avoid missing-prototype warnings
2023-07-12 12:06:04 -04:00
fprobe.c
Probe fixes for 6.5-rc1, the 2nd set:
2023-07-16 12:13:51 -07:00
ftrace_internal.h
tracing: arm64: Avoid missing-prototype warnings
2023-07-12 12:06:04 -04:00
ftrace.c
ftrace: Fix possible warning on checking all pages used in ftrace_process_locs()
2023-07-12 17:47:37 -04:00
Kconfig
Probes updates for v6.5:
2023-06-30 10:44:53 -07:00
kprobe_event_gen_test.c
tracing: Fix wrong return in kprobe_event_gen_test.c
2023-03-19 12:20:48 -04:00
Makefile
tracing/probes: Move finding func-proto API and getting func-param API to trace_btf
2023-08-23 09:39:45 +09:00
pid_list.c
…
pid_list.h
…
power-traces.c
…
preemptirq_delay_test.c
…
rethook.c
Probes fixes and clean ups for v6.5-rc1:
2023-07-12 12:01:16 -07:00
ring_buffer_benchmark.c
ring_buffer: Remove unused "event" parameter
2022-11-23 19:08:30 -05:00
ring_buffer.c
ring-buffer: Fix kernel-doc warnings in ring_buffer.c
2023-07-28 19:59:03 -04:00
rpm-traces.c
…
synth_event_gen_test.c
tracing: Always use canonical ftrace path
2023-02-18 14:34:09 -05:00
trace_benchmark.c
tracing: Add numeric delta time to the trace event benchmark
2022-09-26 13:01:09 -04:00
trace_benchmark.h
tracing: Add numeric delta time to the trace event benchmark
2022-09-26 13:01:09 -04:00
trace_boot.c
tracing/boot: Test strscpy() against less than zero for error
2023-07-05 10:30:49 -04:00
trace_branch.c
…
trace_btf.c
tracing/probes: Add a function to search a member of a struct/union
2023-08-23 09:40:16 +09:00
trace_btf.h
tracing/probes: Add a function to search a member of a struct/union
2023-08-23 09:40:16 +09:00
trace_clock.c
…
trace_dynevent.c
tracing: Free buffers when a used dynamic event is removed
2022-11-23 19:07:12 -05:00
trace_dynevent.h
…
trace_entries.h
function_graph: Support recording and printing the return value of function
2023-06-20 18:38:37 -04:00
trace_eprobe.c
tracing/probes: Support BTF argument on module functions
2023-08-23 09:39:15 +09:00
trace_event_perf.c
tracing/perf: Use strndup_user instead of kzalloc/strncpy_from_user
2022-11-23 19:08:31 -05:00
trace_events_filter_test.h
…
trace_events_filter.c
tracing: Add a way to filter function addresses to function names
2023-01-25 10:31:11 -05:00
trace_events_hist.c
tracing/histograms: Return an error if we fail to add histogram to hist_vars list
2023-07-23 11:18:52 -04:00
trace_events_inject.c
tracing: Replace all non-returning strlcpy with strscpy
2023-05-26 13:52:19 -07:00
trace_events_synth.c
tracing/synthetic: Fix kernel-doc warnings in trace_events_synth.c
2023-07-28 19:59:03 -04:00
trace_events_trigger.c
tracing: Fix kernel-doc warnings in trace_events_trigger.c
2023-07-28 19:59:03 -04:00
trace_events_user.c
tracing/user_events: Fix struct arg size match check
2023-07-10 21:38:13 -04:00
trace_events.c
tracing: Fix warning in trace_buffered_event_disable()
2023-07-28 20:29:51 -04:00
trace_export.c
tracing: Fix TASK_COMM_LEN in trace event format file
2023-02-12 10:23:39 -05:00
trace_fprobe.c
tracing/probes: Support BTF argument on module functions
2023-08-23 09:39:15 +09:00
trace_functions_graph.c
function_graph: Support recording and printing the return value of function
2023-06-20 18:38:37 -04:00
trace_functions.c
…
trace_hwlat.c
tracing/hwlat: Replace sched_setaffinity with set_cpus_allowed_ptr
2023-03-19 13:23:22 -04:00
trace_irqsoff.c
…
trace_kdb.c
…
trace_kprobe_selftest.c
tracing: arm64: Avoid missing-prototype warnings
2023-07-12 12:06:04 -04:00
trace_kprobe_selftest.h
…
trace_kprobe.c
tracing/probes: Support BTF argument on module functions
2023-08-23 09:39:15 +09:00
trace_mmiotrace.c
…
trace_nop.c
…
trace_osnoise.c
tracing/timerlat: Add user-space interface
2023-06-22 10:39:56 -04:00
trace_output.c
Tracing updates for 6.5:
2023-06-30 10:33:17 -07:00
trace_output.h
tracing: Add "fields" option to show raw trace event fields
2023-03-29 06:52:08 -04:00
trace_preemptirq.c
cpuidle: tracing, preempt: Squash _rcuidle tracing
2023-01-31 15:01:46 +01:00
trace_printk.c
…
trace_probe_kernel.h
tracing/probes: Fix to record 0-length data_loc in fetch_store_string*() if fails
2023-07-14 17:04:58 +09:00
trace_probe_tmpl.h
tracing/probes: Fix to record 0-length data_loc in fetch_store_string*() if fails
2023-07-14 17:04:58 +09:00
trace_probe.c
tracing/probes: Support BTF field access from $retval
2023-08-23 09:40:51 +09:00
trace_probe.h
tracing/probes: Support BTF field access from $retval
2023-08-23 09:40:51 +09:00
trace_recursion_record.c
tracing: Use trace_create_file() to simplify creation of tracefs entries
2022-05-26 21:12:52 -04:00
trace_sched_switch.c
…
trace_sched_wakeup.c
…
trace_selftest_dynamic.c
…
trace_selftest.c
tracing: Have function_graph selftest call cond_resched()
2023-05-28 21:15:46 -04:00
trace_seq.c
tracing: Fix kernel-doc warnings in trace_seq.c
2023-07-28 19:59:04 -04:00
trace_stack.c
…
trace_stat.c
…
trace_stat.h
…
trace_synth.h
tracing: Allow synthetic events to pass around stacktraces
2023-01-25 10:31:24 -05:00
trace_syscalls.c
tracing: Remove unused __bad_type_size() method
2022-11-17 20:21:06 -05:00
trace_uprobe.c
tracing/probes: Support BTF argument on module functions
2023-08-23 09:39:15 +09:00
trace.c
tracing/probes: Support BTF based data structure field access
2023-08-23 09:40:28 +09:00
trace.h
Probe fixes for 6.5-rc1, the 2nd set:
2023-07-16 12:13:51 -07:00
tracing_map.c
tracing: Remove unused variable 'dups'
2022-10-03 12:20:31 -04:00
tracing_map.h
tracing: Remove unused extern declaration tracing_map_set_field_descr()
2023-07-23 11:08:14 -04:00