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Subject[PATCH 17/19] TuxOnIce: Support for replacing swsusp.
Date
Provide support for activating TuxOnIce via

echo disk > /sys/power/state

together with a compile time option to control the default and a sysfs
entry in TuxOnIce's directories to toggle it at run time. Since at
resume time we don't know whether we wrote a TuxOnIce image, always
check for TuxOnIce images when checking for swsusp images (TuxOnIce
recognises swsusp signatures and won't complain about them).

Signed-off-by: Nigel Cunningham <nigel@tuxonice.net>
---
kernel/power/Kconfig | 14 ++++++++++++++
kernel/power/disk.c | 10 ++++++++++
kernel/power/tuxonice.h | 1 +
kernel/power/tuxonice_builtin.c | 3 +++
kernel/power/tuxonice_highlevel.c | 2 ++
5 files changed, 30 insertions(+), 0 deletions(-)

diff --git a/kernel/power/Kconfig b/kernel/power/Kconfig
index f669cdd..dfe0328 100644
--- a/kernel/power/Kconfig
+++ b/kernel/power/Kconfig
@@ -259,6 +259,20 @@ menuconfig TOI_CORE
bit. Keep image mode is a little less user friendly on purpose - it
should not be used without thought!

+ config TOI_REPLACE_SWSUSP
+ bool "Replace swsusp by default"
+ default y
+ depends on TOI_CORE
+ ---help---
+ TuxOnIce can replace swsusp. This option makes that the default state,
+ requiring you to echo 0 > /sys/power/tuxonice/replace_swsusp if you want
+ to use the vanilla kernel functionality. Note that your initrd/ramfs will
+ need to do this before trying to resume, too.
+ With overriding swsusp enabled, echoing disk to /sys/power/state will
+ start a TuxOnIce cycle. If resume= doesn't specify an allocator and both
+ the swap and file allocators are compiled in, the swap allocator will be
+ used by default.
+
config TOI_IGNORE_LATE_INITCALL
bool "Wait for initrd/ramfs to run, by default"
default n
diff --git a/kernel/power/disk.c b/kernel/power/disk.c
index 9a1174c..510730a 100644
--- a/kernel/power/disk.c
+++ b/kernel/power/disk.c
@@ -556,6 +556,9 @@ int hibernate(void)
{
int error;

+ if (test_action_state(TOI_REPLACE_SWSUSP))
+ return try_tuxonice_hibernate();
+
mutex_lock(&pm_mutex);
/* The snapshot device should not be opened while we're running */
if (!atomic_add_unless(&snapshot_device_available, -1, 0)) {
@@ -637,6 +640,13 @@ int software_resume(void)
{
int error;
unsigned int flags;
+ resume_attempted = 1;
+
+ /*
+ * We can't know (until an image header - if any - is loaded), whether
+ * we did override swsusp. We therefore ensure that both are tried.
+ */
+ try_tuxonice_resume();

/*
* If the user said "noresume".. bail out early.
diff --git a/kernel/power/tuxonice.h b/kernel/power/tuxonice.h
index 2262973..1d6349d 100644
--- a/kernel/power/tuxonice.h
+++ b/kernel/power/tuxonice.h
@@ -55,6 +55,7 @@ enum {
TOI_TEST_BIO,
TOI_NO_PAGESET2,
TOI_IGNORE_ROOTFS,
+ TOI_REPLACE_SWSUSP,
TOI_PAGESET2_FULL,
TOI_ABORT_ON_RESAVE_NEEDED,
TOI_NO_MULTITHREADED_IO,
diff --git a/kernel/power/tuxonice_builtin.c b/kernel/power/tuxonice_builtin.c
index dab9de2..da7680e 100644
--- a/kernel/power/tuxonice_builtin.c
+++ b/kernel/power/tuxonice_builtin.c
@@ -165,6 +165,9 @@ struct toi_boot_kernel_data toi_bkd __nosavedata
__attribute__((aligned(PAGE_SIZE))) = {
MY_BOOT_KERNEL_DATA_VERSION,
0,
+#ifdef CONFIG_TOI_REPLACE_SWSUSP
+ (1 << TOI_REPLACE_SWSUSP) |
+#endif
(1 << TOI_NO_FLUSHER_THREAD) |
(1 << TOI_PAGESET2_FULL) | (1 << TOI_LATE_CPU_HOTPLUG),
};
diff --git a/kernel/power/tuxonice_highlevel.c b/kernel/power/tuxonice_highlevel.c
index 06f97e7..9bd5b34 100644
--- a/kernel/power/tuxonice_highlevel.c
+++ b/kernel/power/tuxonice_highlevel.c
@@ -1190,6 +1190,8 @@ static struct toi_sysfs_data sysfs_params[] = {
SYSFS_BIT("full_pageset2", SYSFS_RW, &toi_bkd.toi_action,
TOI_PAGESET2_FULL, 0),
SYSFS_BIT("reboot", SYSFS_RW, &toi_bkd.toi_action, TOI_REBOOT, 0),
+ SYSFS_BIT("replace_swsusp", SYSFS_RW, &toi_bkd.toi_action,
+ TOI_REPLACE_SWSUSP, 0),
SYSFS_STRING("resume_commandline", SYSFS_RW,
toi_bkd.toi_nosave_commandline, COMMAND_LINE_SIZE, 0,
NULL),
--
1.5.6.3


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