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Message-ID: <20111223131441.13217.21839.stgit@t3500.sdl.hitachi.co.jp>
Date: Fri, 23 Dec 2011 22:14:41 +0900
From: YOSHIDA Masanori <masanori.yoshida.tv@...achi.com>
To: Thomas Gleixner <tglx@...utronix.de>,
Ingo Molnar <mingo@...hat.com>, hpa@...or.com, x86@...nel.org,
linux-kernel@...r.kernel.org
Cc: hpa@...or.com, Andrew Morton <akpm@...ux-foundation.org>,
Andy Lutomirski <luto@....edu>,
Borislav Petkov <borislav.petkov@....com>,
Ingo Molnar <mingo@...hat.com>,
KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
Kevin Hilman <khilman@...com>,
Marcelo Tosatti <mtosatti@...hat.com>,
Michal Marek <mmarek@...e.cz>, Rik van Riel <riel@...hat.com>,
Tejun Heo <tj@...nel.org>,
Thomas Gleixner <tglx@...utronix.de>,
YOSHIDA Masanori <masanori.yoshida.tv@...achi.com>,
Yinghai Lu <yinghai@...nel.org>, linux-kernel@...r.kernel.org,
x86@...nel.org, frank.rowand@...sony.com, jan.kiszka@....de,
yrl.pp-manager.tt@...achi.com,
YOSHIDA Masanori <masanori.yoshida.tv@...achi.com>,
Thomas Gleixner <tglx@...utronix.de>,
Ingo Molnar <mingo@...hat.com>,
"H. Peter Anvin" <hpa@...or.com>, x86@...nel.org,
Andrew Morton <akpm@...ux-foundation.org>,
Michal Marek <mmarek@...e.cz>, Kevin Hilman <khilman@...com>,
Borislav Petkov <borislav.petkov@....com>,
linux-kernel@...r.kernel.org
Subject: [RFC PATCH 2/5][RESEND] livedump: Add the new misc device "livedump"
Introduces the new misc device "livedump".
The device only has open, close and empty ioctl operations.
Signed-off-by: YOSHIDA Masanori <masanori.yoshida.tv@...achi.com>
Cc: Thomas Gleixner <tglx@...utronix.de>
Cc: Ingo Molnar <mingo@...hat.com>
Cc: "H. Peter Anvin" <hpa@...or.com>
Cc: x86@...nel.org
Cc: Andrew Morton <akpm@...ux-foundation.org>
Cc: Michal Marek <mmarek@...e.cz>
Cc: Kevin Hilman <khilman@...com>
Cc: Borislav Petkov <borislav.petkov@....com>
Cc: linux-kernel@...r.kernel.org
---
arch/x86/Kconfig | 15 ++++++++++
kernel/Makefile | 1 +
kernel/livedump.c | 82 +++++++++++++++++++++++++++++++++++++++++++++++++++++
3 files changed, 98 insertions(+), 0 deletions(-)
create mode 100644 kernel/livedump.c
diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index efb4294..32bc16d 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -1702,6 +1702,21 @@ config CMDLINE_OVERRIDE
This is used to work around broken boot loaders. This should
be set to 'N' under normal conditions.
+config LIVEDUMP
+ bool "Live Dump support"
+ depends on X86_64
+ ---help---
+ Set this option to 'Y' to allow the kernel support to acquire
+ a consistent snapshot of kernel space without stopping system.
+
+ This feature regularly causes small overhead on kernel.
+
+ Once this feature is initialized by its special ioctl, it
+ allocates huge memory for itself and causes much more overhead
+ on kernel.
+
+ If in doubt, say N.
+
endmenu
config ARCH_ENABLE_MEMORY_HOTPLUG
diff --git a/kernel/Makefile b/kernel/Makefile
index e898c5b..7d858e4 100644
--- a/kernel/Makefile
+++ b/kernel/Makefile
@@ -109,6 +109,7 @@ obj-$(CONFIG_USER_RETURN_NOTIFIER) += user-return-notifier.o
obj-$(CONFIG_PADATA) += padata.o
obj-$(CONFIG_CRASH_DUMP) += crash_dump.o
obj-$(CONFIG_JUMP_LABEL) += jump_label.o
+obj-$(CONFIG_LIVEDUMP) += livedump.o
ifneq ($(CONFIG_SCHED_OMIT_FRAME_POINTER),y)
# According to Alan Modra <alan@...uxcare.com.au>, the -fno-omit-frame-pointer is
diff --git a/kernel/livedump.c b/kernel/livedump.c
new file mode 100644
index 0000000..198bda5
--- /dev/null
+++ b/kernel/livedump.c
@@ -0,0 +1,82 @@
+/* livedump.c - Live Dump's main
+ * Copyright (C) 2011 Hitachi, Ltd.
+ * Author: YOSHIDA Masanori <masanori.yoshida.tv@...achi.com>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
+ * MA 02110-1301, USA.
+ */
+
+#include <linux/module.h>
+#include <linux/fs.h>
+#include <linux/miscdevice.h>
+
+#define DEVICE_NAME "livedump"
+
+#define LIVEDUMP_IOC(x) _IO(0xff, x)
+
+static long livedump_ioctl(
+ struct file *file, unsigned int cmd, unsigned long arg)
+{
+ switch (cmd) {
+ default:
+ return -ENOIOCTLCMD;
+ }
+}
+
+static int livedump_open(struct inode *inode, struct file *file)
+{
+ if (!try_module_get(THIS_MODULE))
+ return -ENOENT;
+ return 0;
+}
+
+static int livedump_release(struct inode *inode, struct file *file)
+{
+ module_put(THIS_MODULE);
+ return 0;
+}
+
+static const struct file_operations livedump_fops = {
+ .unlocked_ioctl = livedump_ioctl,
+ .open = livedump_open,
+ .release = livedump_release,
+};
+static struct miscdevice livedump_misc = {
+ .minor = MISC_DYNAMIC_MINOR,
+ .name = DEVICE_NAME,
+ .fops = &livedump_fops,
+};
+
+static int livedump_module_init(void)
+{
+ int ret;
+
+ ret = misc_register(&livedump_misc);
+ if (WARN(ret, "livedump: "
+ "Failed to register livedump on misc device.\n"))
+ return ret;
+
+ return 0;
+}
+module_init(livedump_module_init);
+
+static void livedump_module_exit(void)
+{
+ misc_deregister(&livedump_misc);
+}
+module_exit(livedump_module_exit);
+
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("Livedump kernel module");
--
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