linux-kernel - [PATCH V2 05/12] perf auxtrace: Add optional error flags to the itrace 'e' option

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:   Fri, 10 Jul 2020 18:10:57 +0300
From:   Adrian Hunter <adrian.hunter@...el.com>
To:     Arnaldo Carvalho de Melo <acme@...nel.org>
Cc:     Jiri Olsa <jolsa@...hat.com>, Andi Kleen <ak@...ux.intel.com>,
        linux-kernel@...r.kernel.org
Subject: [PATCH V2 05/12] perf auxtrace: Add optional error flags to the itrace 'e' option

Allow the 'e' option to be followed by flags which will affect what errors
will or will not be reported. Each flag must be preceded by either '+' or
'-'. The flags are:
	o	overflow
	l	trace data lost

Signed-off-by: Adrian Hunter <adrian.hunter@...el.com>
---
 tools/perf/Documentation/itrace.txt |  6 ++++
 tools/perf/util/auxtrace.c          | 44 +++++++++++++++++++++++++++++
 tools/perf/util/auxtrace.h          | 12 +++++++-
 3 files changed, 61 insertions(+), 1 deletion(-)

diff --git a/tools/perf/Documentation/itrace.txt b/tools/perf/Documentation/itrace.txt
index e817179c5027..114d0544d7c7 100644
--- a/tools/perf/Documentation/itrace.txt
+++ b/tools/perf/Documentation/itrace.txt
@@ -47,3 +47,9 @@
 	--itrace=i0nss1000000
 
 	skips the first million instructions.
+
+	The 'e' option may be followed by flags which affect what errors will or
+	will not be reported. Each flag must be preceded by either '+' or '-'.
+	The flags are:
+		o	overflow
+		l	trace data lost
diff --git a/tools/perf/util/auxtrace.c b/tools/perf/util/auxtrace.c
index 25c639ac4ad4..f0b0758830ee 100644
--- a/tools/perf/util/auxtrace.c
+++ b/tools/perf/util/auxtrace.c
@@ -1349,6 +1349,47 @@ void itrace_synth_opts__set_default(struct itrace_synth_opts *synth_opts,
 	synth_opts->initial_skip = 0;
 }
 
+static int get_flag(const char **ptr, unsigned int *flags)
+{
+	while (1) {
+		char c = **ptr;
+
+		if (c >= 'a' && c <= 'z') {
+			*flags |= 1 << (c - 'a');
+			++*ptr;
+			return 0;
+		} else if (c == ' ') {
+			++*ptr;
+			continue;
+		} else {
+			return -1;
+		}
+	}
+}
+
+static int get_flags(const char **ptr, unsigned int *plus_flags, unsigned int *minus_flags)
+{
+	while (1) {
+		switch (**ptr) {
+		case '+':
+			++*ptr;
+			if (get_flag(ptr, plus_flags))
+				return -1;
+			break;
+		case '-':
+			++*ptr;
+			if (get_flag(ptr, minus_flags))
+				return -1;
+			break;
+		case ' ':
+			++*ptr;
+			break;
+		default:
+			return 0;
+		}
+	}
+}
+
 /*
  * Please check tools/perf/Documentation/perf-script.txt for information
  * about the options parsed here, which is introduced after this cset,
@@ -1436,6 +1477,9 @@ int itrace_parse_synth_opts(const struct option *opt, const char *str,
 			break;
 		case 'e':
 			synth_opts->errors = true;
+			if (get_flags(&p, &synth_opts->error_plus_flags,
+				      &synth_opts->error_minus_flags))
+				goto out_err;
 			break;
 		case 'd':
 			synth_opts->log = true;
diff --git a/tools/perf/util/auxtrace.h b/tools/perf/util/auxtrace.h
index e3ce5fb03ca0..cfe6d00d8624 100644
--- a/tools/perf/util/auxtrace.h
+++ b/tools/perf/util/auxtrace.h
@@ -55,6 +55,9 @@ enum itrace_period_type {
 	PERF_ITRACE_PERIOD_NANOSECS,
 };
 
+#define AUXTRACE_ERR_FLG_OVERFLOW	(1 << ('o' - 'a'))
+#define AUXTRACE_ERR_FLG_DATA_LOST	(1 << ('l' - 'a'))
+
 /**
  * struct itrace_synth_opts - AUX area tracing synthesis options.
  * @set: indicates whether or not options have been set
@@ -91,6 +94,8 @@ enum itrace_period_type {
  * @cpu_bitmap: CPUs for which to synthesize events, or NULL for all
  * @ptime_range: time intervals to trace or NULL
  * @range_num: number of time intervals to trace
+ * @error_plus_flags: flags to affect what errors are reported
+ * @error_minus_flags: flags to affect what errors are reported
  */
 struct itrace_synth_opts {
 	bool			set;
@@ -124,6 +129,8 @@ struct itrace_synth_opts {
 	unsigned long		*cpu_bitmap;
 	struct perf_time_interval *ptime_range;
 	int			range_num;
+	unsigned int		error_plus_flags;
+	unsigned int		error_minus_flags;
 };
 
 /**
@@ -613,7 +620,10 @@ bool auxtrace__evsel_is_auxtrace(struct perf_session *session,
 "				p:	    		synthesize power events\n"			\
 "				o:			synthesize other events recorded due to the use\n" \
 "							of aux-output (refer to perf record)\n"	\
-"				e:	    		synthesize error events\n"			\
+"				e[flags]:		synthesize error events\n" \
+"							each flag must be preceded by + or -\n" \
+"							error flags are: o (overflow)\n" \
+"									 l (data lost)\n" \
 "				d:	    		create a debug log\n"			\
 "				f:	    		synthesize first level cache events\n" \
 "				m:	    		synthesize last level cache events\n" \
-- 
2.17.1