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PM: fast power off - core

PATCH In review akuster 2 participants 3 messages Jan 27, 2007 – Jan 29, 2007

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akuster

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#0 lore raw

PATCH 1/2 PM: fast power off - core

My apologies, I cc'd the wrong list the first time around.

- Armin

---

Fastpoweroff allows a user to power down the system without using rc kill scripts. This is used in the advent of a battery operated device about to lose power. The user interface is vis sysfs /sys/power/fastpoweroff. A simple cat of the fastpoweroff will list any registered profiles. To invoke
the profile sequence, echo {profile name} > /sys/power/fastpoweroff.

This is the core code for fastpoweroff profile support, it includes a register/unregister and default profile callbacks.

Signed-off-by Armin Kuster <[email protected]>
---
 fs/super.c                    |    6 +
 kernel/power/Kconfig          |    2 
 kernel/power/Makefile         |    2 
 kernel/power/fastoff/Kconfig  |   13 +++
 kernel/power/fastoff/Makefile |    8 ++
 kernel/power/fastoff/fpo.c    |  155 ++++++++++++++++++++++++++++++++++++++++++
 kernel/power/fastoff/fpo.h    |   27 +++++++
 7 files changed, 213 insertions(+)
kernel/power/Kconfig +2 -0
Index: linux-2.6_dev/kernel/power/Kconfig
===================================================================
@@ -131,3 +131,5 @@ config SUSPEND_SMP
 	bool
 	depends on HOTPLUG_CPU && X86 && PM
 	default y
+
+source "kernel/power/fastoff/Kconfig"
kernel/power/Makefile +2 -0
Index: linux-2.6_dev/kernel/power/Makefile
===================================================================
@@ -8,3 +8,5 @@ obj-$(CONFIG_PM_LEGACY)		+= pm.o
 obj-$(CONFIG_SOFTWARE_SUSPEND)	+= swsusp.o disk.o snapshot.o swap.o user.o
 
 obj-$(CONFIG_MAGIC_SYSRQ)	+= poweroff.o
+
+obj-$(CONFIG_FAST_POWER_OFF)	+= fastoff/
kernel/power/fastoff/Kconfig new file +13 -0
Index: linux-2.6_dev/kernel/power/fastoff/Kconfig
===================================================================
@@ -0,0 +1,13 @@
+#
+# Fast power off configuration
+#
+menu "Fast Power off"
+
+config FAST_POWER_OFF
+	bool "Fast power off support"
+	default y
+	depends on PM && SYSFS
+	---help---
+	  Say yes if you want core support for sysfs/power/fastoff
+
+endmenu
kernel/power/fastoff/Makefile new file +8 -0
Index: linux-2.6_dev/kernel/power/fastoff/Makefile
===================================================================
@@ -0,0 +1,8 @@
+#
+# Makefile for Fast Power off
+#
+# 15 Jan. 2007 Armin Kuster <[email protected]>
+#
+
+obj-$(CONFIG_FAST_POWER_OFF)	:= fpo.o
+
kernel/power/fastoff/fpo.h new file +27 -0
Index: linux-2.6_dev/kernel/power/fastoff/fpo.h
===================================================================
@@ -0,0 +1,27 @@
+#ifndef __FASTOFF_H__
+#define __FASTOFF_H__
+/*
+ * kernel/power/fastoff/fpo.h
+ *
+ * Author: Armin Kuster <[email protected], or [email protected]>
+ *
+ * 2006, 2007  (c) MontaVista Software, Inc. This file is licensed under
+ * the terms of the GNU General Public License version 2. This program
+ * is licensed "as is" without any warranty of any kind, whether express
+ * or implied.
+ */
+
+#define FPO_NAME_LEN 16
+
+struct fpo_driver {
+	char name[FPO_NAME_LEN];
+	int (*policy) (void);
+	struct list_head fpo_list;
+};
+
+extern int fastpoweroff_register(struct fpo_driver *fpo);
+extern void fastpoweroff_unregister(struct fpo_driver *fpo);
+extern void fastpoweroff_prepare(void);
+extern void fastpoweroff(void);
+extern void fastpoweroff_standby(void);
+#endif	/* __FASTOFF_H__ */
kernel/power/fastoff/fpo.c new file +155 -0

155 lines not on this page · raw message

fs/super.c +6 -0
Index: linux-2.6_dev/fs/super.c
===================================================================
@@ -649,6 +649,12 @@ void emergency_remount(void)
 	pdflush_operation(do_emergency_remount, 0);
 }
 
+#ifdef CONFIG_FAST_POWER_OFF
+void suspend_emergency_remount(void)
+{
+	do_emergency_remount(0);
+}
+#endif
 /*
  * Unnamed block devices are dummy devices used by virtual
  * filesystems which don't use real block-devices.  -- jrs
#1 lore raw
Quoted 1 line · On Sat, 27 Jan 2007 10:05:43 -1000 akuster wrote:

My apologies, I cc'd the wrong list the first time around.

{argh, attachments}

kernel/power/Kconfig +2 -0
@@ -131,3 +131,5 @@ config SUSPEND_SMP
 	bool
 	depends on HOTPLUG_CPU && X86 && PM
 	default y
+
+source "kernel/power/fastoff/Kconfig"

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Why a separate, new Kconfig file?
We shouldn't add a new Kconfig file for every new 1-2 kconfig symbols.

---
~Randy

author
#2 lore raw
Quoted 5 lines · Randy Dunlap
Quoted 1 line · On Sat, 27 Jan 2007 10:05:43 -1000 akuster wrote:

My apologies, I cc'd the wrong list the first time around.

{argh, attachments}

my bad

Quoted 11 lines
kernel/power/Kconfig +2 -0
@@ -131,3 +131,5 @@ config SUSPEND_SMP
 	bool
 	depends on HOTPLUG_CPU && X86 && PM
 	default y
+
+source "kernel/power/fastoff/Kconfig"

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Quoted 1 line

Why a separate, new Kconfig file?

Thought it would be cleaner.

Quoted 1 line

We shouldn't add a new Kconfig file for every new 1-2 kconfig symbols.

OK

Quoted 4 lines

---
~Randy