* [PATCH]: In kernel hibernation, suspend to both: draft
@ 2012-05-07 8:37 Bojan Smojver
2012-05-07 20:14 ` Rafael J. Wysocki
0 siblings, 1 reply; 6+ messages in thread
From: Bojan Smojver @ 2012-05-07 8:37 UTC (permalink / raw)
To: Rafael J. Wysocki; +Cc: Linux PM list, linux-kernel
Hi Rafael,
Was just playing with it and this is what I came up with. This is just a
rough draft (I didn't even think of memory leaks and such here, to be
honest). Let me know what you think.
------------------------------
diff --git a/Documentation/power/swsusp.txt b/Documentation/power/swsusp.txt
index ac190cf..92341b8 100644
--- a/Documentation/power/swsusp.txt
+++ b/Documentation/power/swsusp.txt
@@ -33,6 +33,11 @@ echo shutdown > /sys/power/disk; echo disk > /sys/power/state
echo platform > /sys/power/disk; echo disk > /sys/power/state
+. If you would like to write hibernation image to swap and then suspend
+to RAM (provided your platform supports it), you can try
+
+echo suspend > /sys/power/disk; echo disk > /sys/power/state
+
. If you have SATA disks, you'll need recent kernels with SATA suspend
support. For suspend and resume to work, make sure your disk drivers
are built into kernel -- not modules. [There's way to make
diff --git a/kernel/power/hibernate.c b/kernel/power/hibernate.c
index e09dfbf..3b5726f 100644
--- a/kernel/power/hibernate.c
+++ b/kernel/power/hibernate.c
@@ -5,6 +5,7 @@
* Copyright (c) 2003 Open Source Development Lab
* Copyright (c) 2004 Pavel Machek <pavel@ucw.cz>
* Copyright (c) 2009 Rafael J. Wysocki, Novell Inc.
+ * Copyright (C) 2012 Bojan Smojver <bojan@rexursive.com>
*
* This file is released under the GPLv2.
*/
@@ -44,6 +45,9 @@ enum {
HIBERNATION_PLATFORM,
HIBERNATION_SHUTDOWN,
HIBERNATION_REBOOT,
+#ifdef CONFIG_SUSPEND
+ HIBERNATION_SUSPEND,
+#endif
/* keep last */
__HIBERNATION_AFTER_LAST
};
@@ -572,6 +576,10 @@ int hibernation_platform_enter(void)
*/
static void power_down(void)
{
+#ifdef CONFIG_SUSPEND
+ int error;
+#endif
+
switch (hibernation_mode) {
case HIBERNATION_REBOOT:
kernel_restart(NULL);
@@ -581,6 +589,25 @@ static void power_down(void)
case HIBERNATION_SHUTDOWN:
kernel_power_off();
break;
+#ifdef CONFIG_SUSPEND
+ case HIBERNATION_SUSPEND:
+ error = suspend_devices_and_enter(PM_SUSPEND_MEM);
+ if (error) {
+ if (hibernation_ops)
+ hibernation_mode = HIBERNATION_PLATFORM;
+ else
+ hibernation_mode = HIBERNATION_SHUTDOWN;
+ power_down();
+ }
+ /*
+ * Restore swap signature.
+ */
+ error = swsusp_unmark();
+ if (error)
+ printk(KERN_ERR "PM: Swap will be unusable! "
+ "Try swapon -a.\n");
+ return;
+#endif
}
kernel_halt();
/*
@@ -814,6 +841,9 @@ static const char * const hibernation_modes[] = {
[HIBERNATION_PLATFORM] = "platform",
[HIBERNATION_SHUTDOWN] = "shutdown",
[HIBERNATION_REBOOT] = "reboot",
+#ifdef CONFIG_SUSPEND
+ [HIBERNATION_SUSPEND] = "suspend",
+#endif
};
/*
@@ -854,6 +884,9 @@ static ssize_t disk_show(struct kobject *kobj, struct kobj_attribute *attr,
switch (i) {
case HIBERNATION_SHUTDOWN:
case HIBERNATION_REBOOT:
+#ifdef CONFIG_SUSPEND
+ case HIBERNATION_SUSPEND:
+#endif
break;
case HIBERNATION_PLATFORM:
if (hibernation_ops)
@@ -894,6 +927,9 @@ static ssize_t disk_store(struct kobject *kobj, struct kobj_attribute *attr,
switch (mode) {
case HIBERNATION_SHUTDOWN:
case HIBERNATION_REBOOT:
+#ifdef CONFIG_SUSPEND
+ case HIBERNATION_SUSPEND:
+#endif
hibernation_mode = mode;
break;
case HIBERNATION_PLATFORM:
diff --git a/kernel/power/power.h b/kernel/power/power.h
index 98f3622..07b4a68 100644
--- a/kernel/power/power.h
+++ b/kernel/power/power.h
@@ -156,6 +156,9 @@ extern void swsusp_free(void);
extern int swsusp_read(unsigned int *flags_p);
extern int swsusp_write(unsigned int flags);
extern void swsusp_close(fmode_t);
+#ifdef CONFIG_SUSPEND
+extern int swsusp_unmark(void);
+#endif
/* kernel/power/block_io.c */
extern struct block_device *hib_resume_bdev;
diff --git a/kernel/power/swap.c b/kernel/power/swap.c
index eef311a..1027da8 100644
--- a/kernel/power/swap.c
+++ b/kernel/power/swap.c
@@ -1456,6 +1456,34 @@ void swsusp_close(fmode_t mode)
blkdev_put(hib_resume_bdev, mode);
}
+/**
+ * swsusp_unmark - Unmark swsusp signature in the resume device
+ */
+
+#ifdef CONFIG_SUSPEND
+int swsusp_unmark(void)
+{
+ int error;
+
+ hib_bio_read_page(swsusp_resume_block, swsusp_header, NULL);
+ if (!memcmp(HIBERNATE_SIG,swsusp_header->sig, 10)) {
+ memcpy(swsusp_header->sig,swsusp_header->orig_sig, 10);
+ error = hib_bio_write_page(swsusp_resume_block,
+ swsusp_header, NULL);
+ } else {
+ printk(KERN_ERR "PM: Cannot find swsusp signature!\n");
+ error = -ENODEV;
+ }
+
+ /*
+ * We just returned from suspend, we don't need the image any more.
+ */
+ free_all_swap_pages(root_swap);
+
+ return error;
+}
+#endif
+
static int swsusp_header_init(void)
{
swsusp_header = (struct swsusp_header*) __get_free_page(GFP_KERNEL);
------------------------------
--
Bojan
^ permalink raw reply related [flat|nested] 6+ messages in thread* Re: [PATCH]: In kernel hibernation, suspend to both: draft
2012-05-07 8:37 [PATCH]: In kernel hibernation, suspend to both: draft Bojan Smojver
@ 2012-05-07 20:14 ` Rafael J. Wysocki
2012-05-08 3:15 ` Bojan Smojver
0 siblings, 1 reply; 6+ messages in thread
From: Rafael J. Wysocki @ 2012-05-07 20:14 UTC (permalink / raw)
To: Bojan Smojver; +Cc: Linux PM list, linux-kernel
Hi,
On Monday, May 07, 2012, Bojan Smojver wrote:
> Hi Rafael,
>
> Was just playing with it and this is what I came up with. This is just a
> rough draft (I didn't even think of memory leaks and such here, to be
> honest). Let me know what you think.
Looks reasonable at first sight.
Thanks,
Rafael
> ------------------------------
> diff --git a/Documentation/power/swsusp.txt b/Documentation/power/swsusp.txt
> index ac190cf..92341b8 100644
> --- a/Documentation/power/swsusp.txt
> +++ b/Documentation/power/swsusp.txt
> @@ -33,6 +33,11 @@ echo shutdown > /sys/power/disk; echo disk > /sys/power/state
>
> echo platform > /sys/power/disk; echo disk > /sys/power/state
>
> +. If you would like to write hibernation image to swap and then suspend
> +to RAM (provided your platform supports it), you can try
> +
> +echo suspend > /sys/power/disk; echo disk > /sys/power/state
> +
> . If you have SATA disks, you'll need recent kernels with SATA suspend
> support. For suspend and resume to work, make sure your disk drivers
> are built into kernel -- not modules. [There's way to make
> diff --git a/kernel/power/hibernate.c b/kernel/power/hibernate.c
> index e09dfbf..3b5726f 100644
> --- a/kernel/power/hibernate.c
> +++ b/kernel/power/hibernate.c
> @@ -5,6 +5,7 @@
> * Copyright (c) 2003 Open Source Development Lab
> * Copyright (c) 2004 Pavel Machek <pavel@ucw.cz>
> * Copyright (c) 2009 Rafael J. Wysocki, Novell Inc.
> + * Copyright (C) 2012 Bojan Smojver <bojan@rexursive.com>
> *
> * This file is released under the GPLv2.
> */
> @@ -44,6 +45,9 @@ enum {
> HIBERNATION_PLATFORM,
> HIBERNATION_SHUTDOWN,
> HIBERNATION_REBOOT,
> +#ifdef CONFIG_SUSPEND
> + HIBERNATION_SUSPEND,
> +#endif
> /* keep last */
> __HIBERNATION_AFTER_LAST
> };
> @@ -572,6 +576,10 @@ int hibernation_platform_enter(void)
> */
> static void power_down(void)
> {
> +#ifdef CONFIG_SUSPEND
> + int error;
> +#endif
> +
> switch (hibernation_mode) {
> case HIBERNATION_REBOOT:
> kernel_restart(NULL);
> @@ -581,6 +589,25 @@ static void power_down(void)
> case HIBERNATION_SHUTDOWN:
> kernel_power_off();
> break;
> +#ifdef CONFIG_SUSPEND
> + case HIBERNATION_SUSPEND:
> + error = suspend_devices_and_enter(PM_SUSPEND_MEM);
> + if (error) {
> + if (hibernation_ops)
> + hibernation_mode = HIBERNATION_PLATFORM;
> + else
> + hibernation_mode = HIBERNATION_SHUTDOWN;
> + power_down();
> + }
> + /*
> + * Restore swap signature.
> + */
> + error = swsusp_unmark();
> + if (error)
> + printk(KERN_ERR "PM: Swap will be unusable! "
> + "Try swapon -a.\n");
> + return;
> +#endif
> }
> kernel_halt();
> /*
> @@ -814,6 +841,9 @@ static const char * const hibernation_modes[] = {
> [HIBERNATION_PLATFORM] = "platform",
> [HIBERNATION_SHUTDOWN] = "shutdown",
> [HIBERNATION_REBOOT] = "reboot",
> +#ifdef CONFIG_SUSPEND
> + [HIBERNATION_SUSPEND] = "suspend",
> +#endif
> };
>
> /*
> @@ -854,6 +884,9 @@ static ssize_t disk_show(struct kobject *kobj, struct kobj_attribute *attr,
> switch (i) {
> case HIBERNATION_SHUTDOWN:
> case HIBERNATION_REBOOT:
> +#ifdef CONFIG_SUSPEND
> + case HIBERNATION_SUSPEND:
> +#endif
> break;
> case HIBERNATION_PLATFORM:
> if (hibernation_ops)
> @@ -894,6 +927,9 @@ static ssize_t disk_store(struct kobject *kobj, struct kobj_attribute *attr,
> switch (mode) {
> case HIBERNATION_SHUTDOWN:
> case HIBERNATION_REBOOT:
> +#ifdef CONFIG_SUSPEND
> + case HIBERNATION_SUSPEND:
> +#endif
> hibernation_mode = mode;
> break;
> case HIBERNATION_PLATFORM:
> diff --git a/kernel/power/power.h b/kernel/power/power.h
> index 98f3622..07b4a68 100644
> --- a/kernel/power/power.h
> +++ b/kernel/power/power.h
> @@ -156,6 +156,9 @@ extern void swsusp_free(void);
> extern int swsusp_read(unsigned int *flags_p);
> extern int swsusp_write(unsigned int flags);
> extern void swsusp_close(fmode_t);
> +#ifdef CONFIG_SUSPEND
> +extern int swsusp_unmark(void);
> +#endif
>
> /* kernel/power/block_io.c */
> extern struct block_device *hib_resume_bdev;
> diff --git a/kernel/power/swap.c b/kernel/power/swap.c
> index eef311a..1027da8 100644
> --- a/kernel/power/swap.c
> +++ b/kernel/power/swap.c
> @@ -1456,6 +1456,34 @@ void swsusp_close(fmode_t mode)
> blkdev_put(hib_resume_bdev, mode);
> }
>
> +/**
> + * swsusp_unmark - Unmark swsusp signature in the resume device
> + */
> +
> +#ifdef CONFIG_SUSPEND
> +int swsusp_unmark(void)
> +{
> + int error;
> +
> + hib_bio_read_page(swsusp_resume_block, swsusp_header, NULL);
> + if (!memcmp(HIBERNATE_SIG,swsusp_header->sig, 10)) {
> + memcpy(swsusp_header->sig,swsusp_header->orig_sig, 10);
> + error = hib_bio_write_page(swsusp_resume_block,
> + swsusp_header, NULL);
> + } else {
> + printk(KERN_ERR "PM: Cannot find swsusp signature!\n");
> + error = -ENODEV;
> + }
> +
> + /*
> + * We just returned from suspend, we don't need the image any more.
> + */
> + free_all_swap_pages(root_swap);
> +
> + return error;
> +}
> +#endif
> +
> static int swsusp_header_init(void)
> {
> swsusp_header = (struct swsusp_header*) __get_free_page(GFP_KERNEL);
> ------------------------------
>
>
^ permalink raw reply [flat|nested] 6+ messages in thread* Re: [PATCH]: In kernel hibernation, suspend to both: draft
2012-05-07 20:14 ` Rafael J. Wysocki
@ 2012-05-08 3:15 ` Bojan Smojver
2012-05-08 21:26 ` Rafael J. Wysocki
0 siblings, 1 reply; 6+ messages in thread
From: Bojan Smojver @ 2012-05-08 3:15 UTC (permalink / raw)
To: Rafael J. Wysocki; +Cc: Linux PM list, linux-kernel
On Mon, 2012-05-07 at 22:14 +0200, Rafael J. Wysocki wrote:
> Looks reasonable at first sight.
OK, thanks for having a look! I'll check to see whether memory for
hibernation is been released properly and then I may submit this for
real. BTW, the patch actually worked on my ThinkPad T510. The miracles
never stop. :-)
Just to be sure - I should prepare a patch against your linux-next
branch, correct? This patch was against mainline, which is still
somewhat behind.
--
Bojan
^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: [PATCH]: In kernel hibernation, suspend to both: draft
2012-05-08 3:15 ` Bojan Smojver
@ 2012-05-08 21:26 ` Rafael J. Wysocki
2012-05-09 7:24 ` Borislav Petkov
0 siblings, 1 reply; 6+ messages in thread
From: Rafael J. Wysocki @ 2012-05-08 21:26 UTC (permalink / raw)
To: Bojan Smojver; +Cc: Linux PM list, linux-kernel
On Tuesday, May 08, 2012, Bojan Smojver wrote:
> On Mon, 2012-05-07 at 22:14 +0200, Rafael J. Wysocki wrote:
> > Looks reasonable at first sight.
>
> OK, thanks for having a look! I'll check to see whether memory for
> hibernation is been released properly and then I may submit this for
> real. BTW, the patch actually worked on my ThinkPad T510. The miracles
> never stop. :-)
>
> Just to be sure - I should prepare a patch against your linux-next
> branch, correct?
Yup.
^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: [PATCH]: In kernel hibernation, suspend to both: draft
2012-05-08 21:26 ` Rafael J. Wysocki
@ 2012-05-09 7:24 ` Borislav Petkov
2012-05-09 7:41 ` Bojan Smojver
0 siblings, 1 reply; 6+ messages in thread
From: Borislav Petkov @ 2012-05-09 7:24 UTC (permalink / raw)
To: Rafael J. Wysocki; +Cc: Bojan Smojver, Linux PM list, linux-kernel
On Tue, May 08, 2012 at 11:26:42PM +0200, Rafael J. Wysocki wrote:
> On Tuesday, May 08, 2012, Bojan Smojver wrote:
> > On Mon, 2012-05-07 at 22:14 +0200, Rafael J. Wysocki wrote:
> > > Looks reasonable at first sight.
> >
> > OK, thanks for having a look! I'll check to see whether memory for
> > hibernation is been released properly and then I may submit this for
> > real. BTW, the patch actually worked on my ThinkPad T510. The miracles
> > never stop. :-)
> >
> > Just to be sure - I should prepare a patch against your linux-next
> > branch, correct?
>
> Yup.
Oh goody, that's what the apples do - suspend to ram and disk. When you
have the patch ready, you'll have another tester, just send it on my way
too pls :-).
Thanks.
--
Regards/Gruss,
Boris.
^ permalink raw reply [flat|nested] 6+ messages in thread* Re: [PATCH]: In kernel hibernation, suspend to both: draft
2012-05-09 7:24 ` Borislav Petkov
@ 2012-05-09 7:41 ` Bojan Smojver
0 siblings, 0 replies; 6+ messages in thread
From: Bojan Smojver @ 2012-05-09 7:41 UTC (permalink / raw)
To: Borislav Petkov; +Cc: Rafael J. Wysocki, Linux PM list, linux-kernel
On Wed, 2012-05-09 at 09:24 +0200, Borislav Petkov wrote:
> Oh goody, that's what the apples do - suspend to ram and disk. When
> you have the patch ready, you'll have another tester, just send it on
> my way too pls :-).
Pretty much the same thing submitted to Rafael here:
http://marc.info/?l=linux-kernel&m=133651588229850&w=2
It worked on my ThinkPad, but YMMV. :-)
--
Bojan
^ permalink raw reply [flat|nested] 6+ messages in thread
end of thread, other threads:[~2012-05-09 7:41 UTC | newest]
Thread overview: 6+ messages (download: mbox.gz follow: Atom feed
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2012-05-07 8:37 [PATCH]: In kernel hibernation, suspend to both: draft Bojan Smojver
2012-05-07 20:14 ` Rafael J. Wysocki
2012-05-08 3:15 ` Bojan Smojver
2012-05-08 21:26 ` Rafael J. Wysocki
2012-05-09 7:24 ` Borislav Petkov
2012-05-09 7:41 ` Bojan Smojver
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