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Date: Wed, 14 Nov 2012 18:18:16 +0200
From: Vladimir Kondratiev <qca_vkondrat@....qualcomm.com>
To: Joe Perches <joe@...ches.com>
CC: "John W . Linville" <linville@...driver.com>,
Johannes Berg <johannes@...solutions.net>,
Andrew Morton <akpm@...ux-foundation.org>,
<linux-wireless@...r.kernel.org>,
"Luis R . Rodriguez" <rodrigue@....qualcomm.com>,
Jason Baron <jbaron@...hat.com>,
Jim Cromie <jim.cromie@...il.com>,
Greg KH <gregkh@...uxfoundation.org>,
LKML <linux-kernel@...r.kernel.org>
Subject: Re: [RFC] dynamic_debug: introduce debug_hex_dump()
On Wednesday, November 14, 2012 05:41:08 AM Joe Perches wrote:
> On Wed, 2012-11-14 at 14:17 +0200, Vladimir Kondratiev wrote:
> > Introduce debug_hex_dump() that can be dynamically controlled, similar to
> > pr_debug.
>
> (added Jason Baron, Jim Cromie, GregKH and lkml to cc's)
>
> []
>
> > diff --git a/include/linux/printk.h b/include/linux/printk.h
>
> []
>
> > @@ -220,6 +220,20 @@ extern void dump_stack(void) __cold;
> >
> > no_printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__)
> >
> > #endifD
> >
> > +#if defined(CONFIG_DYNAMIC_DEBUG)
> > +#define debug_hex_dump(prefix_str, prefix_type, rowsize, \
> > + groupsize, buf, len, ascii) \
> > + dynamic_hex_dump(prefix_str, prefix_type,\
> > + rowsize, groupsize, buf,\
> > + len, ascii)
> > +#else
> > +#define debug_hex_dump(prefix_str, prefix_type, rowsize, \
> > + groupsize, buf, len, ascii) \
> > + print_hex_dump(KERN_DEBUG, prefix_str, \
> > + prefix_type, rowsize, \
> > + groupsize, buf, len, ascii)
> > +#endif
>
> These should be in a different location after print_hex_dump
> is declared. Also for #defines, the indentation doesn't
> need to be so deep.
Ups, correct.
>
> #if defined(CONFIG_DYNAMIC_DEBUG)
> #define debug_hex_dump(prefix_str, prefix_type, rowsize, \
> groupsize, buf, len, ascii) \
> dynamic_hex_dump(prefix_str, prefix_type, \
> rowsize, groupsize, buf, len, ascii)
> #else
> #define debug_hex_dump(prefix_str, prefix_type, rowsize, \
> groupsize, buf, len, ascii) \
> print_hex_dump(KERN_DEBUG, prefix_str, prefix_type, \
> rowsize, groupsize, buf, len, ascii)
> #endif
>
> A better option might be to convert print_hex_dump_bytes()
> to dynamic_debug as that's already KERN_DEBUG. That
> could be simpler overall and it makes existing calls
> become dynamic as well.
And, here it goes (can I call it PATCH?):
>From 755b74861b66435bfe4875b64a53c45bbe172495 Mon Sep 17 00:00:00 2001
From: Vladimir Kondratiev <qca_vkondrat@....qualcomm.com>
Date: Wed, 14 Nov 2012 18:14:15 +0200
Subject: [PATCH] dynamic_debug: dynamic hex dump
Introduce debug_hex_dump() that can be dynamically controlled, similar to
pr_debug.
Also, make print_hex_dump_bytes() dynamically controlled
Implement only 'p' flag (_DPRINTK_FLAGS_PRINT) to keep it simple since hex dump prints
multiple lines and long prefix would impact readability.
To provide line/file etc. information, use pr_debug or similar
before/after debug_hex_dump()
Signed-off-by: Vladimir Kondratiev <qca_vkondrat@....qualcomm.com>
---
Documentation/dynamic-debug-howto.txt | 11 +++++++++--
include/linux/dynamic_debug.h | 10 ++++++++++
include/linux/printk.h | 17 +++++++++++++++++
3 files changed, 36 insertions(+), 2 deletions(-)
diff --git a/Documentation/dynamic-debug-howto.txt b/Documentation/dynamic-debug-howto.txt
index 6e16849..cec98f8 100644
--- a/Documentation/dynamic-debug-howto.txt
+++ b/Documentation/dynamic-debug-howto.txt
@@ -6,8 +6,12 @@ This document describes how to use the dynamic debug (dyndbg) feature.
Dynamic debug is designed to allow you to dynamically enable/disable
kernel code to obtain additional kernel information. Currently, if
-CONFIG_DYNAMIC_DEBUG is set, then all pr_debug()/dev_dbg() calls can
-be dynamically enabled per-callsite.
+CONFIG_DYNAMIC_DEBUG is set, then all pr_debug()/dev_dbg() and
+debug_hex_dump()/print_hex_dump_bytes() calls can be dynamically
+enabled per-callsite.
+
+If CONFIG_DYNAMIC_DEBUG is not set, debug_hex_dump() is just shortcut
+for print_hex_dump(KERN_DEBUG).
Dynamic debug has even more useful features:
@@ -202,6 +206,9 @@ The flags are:
t Include thread ID in messages not generated from interrupt context
_ No flags are set. (Or'd with others on input)
+For debug_hex_dump() and print_hex_dump_bytes(), only 'p' flag have meaning,
+other flags ignored.
+
For display, the flags are preceded by '='
(mnemonic: what the flags are currently equal to).
diff --git a/include/linux/dynamic_debug.h b/include/linux/dynamic_debug.h
index 6dd4787..17565ab 100644
--- a/include/linux/dynamic_debug.h
+++ b/include/linux/dynamic_debug.h
@@ -95,6 +95,16 @@ do { \
##__VA_ARGS__); \
} while (0)
+#define dynamic_hex_dump(prefix_str, prefix_type, rowsize, \
+ groupsize, buf, len, ascii) \
+do { \
+ DEFINE_DYNAMIC_DEBUG_METADATA(descriptor, prefix_str); \
+ if (unlikely(descriptor.flags & _DPRINTK_FLAGS_PRINT)) \
+ print_hex_dump(KERN_DEBUG, prefix_str, \
+ prefix_type, rowsize, groupsize, \
+ buf, len, ascii); \
+} while (0)
+
#else
#include <linux/string.h>
diff --git a/include/linux/printk.h b/include/linux/printk.h
index 9afc01e..82dc610 100644
--- a/include/linux/printk.h
+++ b/include/linux/printk.h
@@ -321,8 +321,13 @@ extern void hex_dump_to_buffer(const void *buf, size_t len,
extern void print_hex_dump(const char *level, const char *prefix_str,
int prefix_type, int rowsize, int groupsize,
const void *buf, size_t len, bool ascii);
+#if defined(CONFIG_DYNAMIC_DEBUG)
+#define print_hex_dump_bytes(prefix_str, prefix_type, buf, len) \
+ dynamic_hex_dump(prefix_str, prefix_type, 16, 1, buf, len, true)
+#else
extern void print_hex_dump_bytes(const char *prefix_str, int prefix_type,
const void *buf, size_t len);
+#endif /* defined(CONFIG_DYNAMIC_DEBUG) */
#else
static inline void print_hex_dump(const char *level, const char *prefix_str,
int prefix_type, int rowsize, int groupsize,
@@ -336,4 +341,16 @@ static inline void print_hex_dump_bytes(const char *prefix_str, int prefix_type,
#endif
+#if defined(CONFIG_DYNAMIC_DEBUG)
+#define debug_hex_dump(prefix_str, prefix_type, rowsize, \
+ groupsize, buf, len, ascii) \
+ dynamic_hex_dump(prefix_str, prefix_type, rowsize, \
+ groupsize, buf, len, ascii)
+#else
+#define debug_hex_dump(prefix_str, prefix_type, rowsize, \
+ groupsize, buf, len, ascii) \
+ print_hex_dump(KERN_DEBUG, prefix_str, prefix_type, rowsize, \
+ groupsize, buf, len, ascii)
+#endif /* defined(CONFIG_DYNAMIC_DEBUG) */
+
#endif
--
1.7.10.4
--
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