linux-kernel - [PATCH 2/4] panic: use the aural error reporting framework to report panics

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Message-Id: <20190401102456.11162-3-mcroce@redhat.com>
Date:   Mon,  1 Apr 2019 12:24:53 +0200
From:   Matteo Croce <mcroce@...hat.com>
To:     x86@...nel.org, LKML <linux-kernel@...r.kernel.org>,
        linux-sound@...r.kernel.org, platform-driver-x86@...r.kernel.org
Subject: [PATCH 2/4] panic: use the aural error reporting framework to report panics

Use the new aural error reporting framework to signal kernel panic. The
error sound is emitted between the stack dump and the kexec jump.

Signed-off-by: Matteo Croce <mcroce@...hat.com>
---
 kernel/panic.c    | 25 +++++++++++++++++++++++++
 lib/Kconfig.debug | 10 ++++++++++
 2 files changed, 35 insertions(+)

diff --git a/kernel/panic.c b/kernel/panic.c
index 0ae0d7332f12..360578e092e7 100644
--- a/kernel/panic.c
+++ b/kernel/panic.c
@@ -29,6 +29,7 @@
 #include <linux/bug.h>
 #include <linux/ratelimit.h>
 #include <linux/debugfs.h>
+#include <linux/play.h>
 #include <asm/sections.h>
 
 #define PANIC_TIMER_STEP 100
@@ -57,6 +58,29 @@ ATOMIC_NOTIFIER_HEAD(panic_notifier_list);
 
 EXPORT_SYMBOL(panic_notifier_list);
 
+#ifdef CONFIG_AUDIBLE_PANIC
+static struct note panic_sound[] = {
+	{ 784, 400 },
+	{ 784, 400 },
+	{ 784, 400 },
+	{ 622, 300 },
+	{ 932, 100 },
+	{ 784, 400 },
+	{ 622, 300 },
+	{ 932, 100 },
+	{ 784, 800 },
+	{ 1174, 400 },
+	{ 1174, 400 },
+	{ 1174, 400 },
+	{ 1244, 300 },
+	{ 932, 100 },
+	{ 740, 400 },
+	{ 622, 300 },
+	{ 932, 100 },
+	{ 784, 800 },
+};
+#endif
+
 static long no_blink(int state)
 {
 	return 0;
@@ -213,6 +237,7 @@ void panic(const char *fmt, ...)
 	if (!test_taint(TAINT_DIE) && oops_in_progress <= 1)
 		dump_stack();
 #endif
+	play(panic_sound, ARRAY_SIZE(panic_sound));
 
 	/*
 	 * If we have crashed and we have a crash kernel loaded let it handle
diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug
index 10d04b266aef..e5d187dfc74a 100644
--- a/lib/Kconfig.debug
+++ b/lib/Kconfig.debug
@@ -997,6 +997,16 @@ config PLAY_LIB
 	depends on HAVE_PCSPKR_PLATFORM
 	default n
 
+config AUDIBLE_PANIC
+	bool "Aural panic"
+	select PLAY_LIB
+	default n
+	help
+	  If you say Y here, kernel panics will play a sound just
+	  after the stacktrace and registers dump. The sound is played via
+	  the system buzzer and not via any soundcard.
+	  Not available on all platforms.
+
 config SCHED_DEBUG
 	bool "Collect scheduler debugging info"
 	depends on DEBUG_KERNEL && PROC_FS
-- 
2.20.1