linux-kernel - [PATCH v1 12/12] dyndbg: add trace support for hexdump

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Message-Id: <20231103131011.1316396-13-lb@semihalf.com>
Date:   Fri,  3 Nov 2023 14:10:11 +0100
From:   Łukasz Bartosik <lb@...ihalf.com>
To:     Jason Baron <jbaron@...mai.com>, Jim Cromie <jim.cromie@...il.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Kees Cook <keescook@...omium.org>,
        Douglas Anderson <dianders@...omium.org>
Cc:     Guenter Roeck <groeck@...gle.com>,
        Yaniv Tzoreff <yanivt@...gle.com>,
        Benson Leung <bleung@...gle.com>,
        Steven Rostedt <rostedt@...dmis.org>,
        Vincent Whitchurch <vincent.whitchurch@...s.com>,
        Pekka Paalanen <ppaalanen@...il.com>,
        Sean Paul <seanpaul@...omium.org>,
        Daniel Vetter <daniel@...ll.ch>, linux-kernel@...r.kernel.org,
        upstream@...ihalf.com
Subject: [PATCH v1 12/12] dyndbg: add trace support for hexdump

Add support for writing hexdump debug logs to trace.

Signed-off-by: Łukasz Bartosik <lb@...ihalf.com>
---
 include/linux/dynamic_debug.h | 16 ++++++++++------
 lib/dynamic_debug.c           | 35 +++++++++++++++++++++++++++++++++++
 2 files changed, 45 insertions(+), 6 deletions(-)

diff --git a/include/linux/dynamic_debug.h b/include/linux/dynamic_debug.h
index 3084302876b4..e01b529dcd09 100644
--- a/include/linux/dynamic_debug.h
+++ b/include/linux/dynamic_debug.h
@@ -298,12 +298,16 @@ void __dynamic_ibdev_dbg(struct _ddebug *descriptor,
 	_dynamic_func_call(fmt, __dynamic_ibdev_dbg,		\
 			   dev, fmt, ##__VA_ARGS__)
 
-#define dynamic_hex_dump(prefix_str, prefix_type, rowsize,		\
-			 groupsize, buf, len, ascii)			\
-	_dynamic_func_call_no_desc(__builtin_constant_p(prefix_str) ? prefix_str : "hexdump", \
-				   print_hex_dump,			\
-				   KERN_DEBUG, prefix_str, prefix_type,	\
-				   rowsize, groupsize, buf, len, ascii)
+void _print_hex_dump(struct _ddebug *descriptor, const char *level,
+		     const char *prefix_str, int prefix_type, int rowsize,
+		     int groupsize, const void *buf, size_t len, bool ascii);
+
+#define dynamic_hex_dump(prefix_str, prefix_type, rowsize,				\
+			 groupsize, buf, len, ascii)					\
+	_dynamic_func_call(__builtin_constant_p(prefix_str) ? prefix_str : "hexdump",	\
+			   _print_hex_dump,						\
+			   KERN_DEBUG, prefix_str, prefix_type,				\
+			   rowsize, groupsize, buf, len, ascii)
 
 /* for test only, generally expect drm.debug style macro wrappers */
 #define __pr_debug_cls(cls, fmt, ...) do {			\
diff --git a/lib/dynamic_debug.c b/lib/dynamic_debug.c
index 541d9d522b3b..fb2c6e2909bb 100644
--- a/lib/dynamic_debug.c
+++ b/lib/dynamic_debug.c
@@ -1128,6 +1128,41 @@ static void ddebug_dev_printk(struct _ddebug *desc, const struct device *dev,
 	}
 }
 
+void _print_hex_dump(struct _ddebug *descriptor, const char *level,
+		     const char *prefix_str, int prefix_type, int rowsize,
+		     int groupsize, const void *buf, size_t len, bool ascii)
+{
+	const u8 *ptr = buf;
+	int i, linelen, remaining = len;
+	unsigned char linebuf[32 * 3 + 2 + 32 + 1];
+
+	if (rowsize != 16 && rowsize != 32)
+		rowsize = 16;
+
+	for (i = 0; i < len; i += rowsize) {
+		linelen = min(remaining, rowsize);
+		remaining -= rowsize;
+
+		hex_dump_to_buffer(ptr + i, linelen, rowsize, groupsize,
+				   linebuf, sizeof(linebuf), ascii);
+
+		switch (prefix_type) {
+		case DUMP_PREFIX_ADDRESS:
+			ddebug_printk(descriptor, "%s%s%p: %s\n",
+				      level, prefix_str, ptr + i, linebuf);
+			break;
+		case DUMP_PREFIX_OFFSET:
+			ddebug_printk(descriptor, "%s%s%.8x: %s\n",
+				      level, prefix_str, i, linebuf);
+			break;
+		default:
+			ddebug_printk(descriptor, "%s%s%s\n",
+				      level, prefix_str, linebuf);
+			break;
+		}
+	}
+}
+
 void __dynamic_pr_debug(struct _ddebug *descriptor, const char *fmt, ...)
 {
 	va_list args;
-- 
2.42.0.869.gea05f2083d-goog