* Re: pm: Revert swsusp to 2.6.0-test3
2003-09-28 17:40 ` Linus Torvalds
@ 2003-09-28 17:58 ` Pavel Machek
2003-09-28 20:24 ` Pavel Machek
` (2 more replies)
2003-09-28 18:48 ` Nigel Cunningham
1 sibling, 3 replies; 16+ messages in thread
From: Pavel Machek @ 2003-09-28 17:58 UTC (permalink / raw)
To: Linus Torvalds; +Cc: kernel list, Patrick Mochel
HI!
> > This should not be warring patch. Pat
> > already has variant in his tree,
> > feel free to pull from him - but it
> > would be nice to have working swsusp
> > in -test6. --p
>
> Ok. In that case, can we remove the '#if 0' blocks entirely, or at least
> add a big comment on why they are there but disabled?
Like this?
> I'd also like to have some kind of readme or similar on the different
> suspend/resume issues, and why we have two different
> approaches. Hmm?
I do not yet have details "how is patricks pmdisk different from
swsusp", so this documentation is hard to write at this point.
Pavel
Index: include/linux/suspend.h
===================================================================
RCS file: /home/pavel/sf/bitbucket/bkcvs/linux-2.5/include/linux/suspend.h,v
retrieving revision 1.18
diff -u -u -r1.18 suspend.h
--- include/linux/suspend.h 21 Aug 2003 23:44:53 -0000 1.18
+++ include/linux/suspend.h 26 Sep 2003 10:53:27 -0000
@@ -8,7 +8,11 @@
#include <linux/notifier.h>
#include <linux/config.h>
#include <linux/init.h>
-#include <linux/pm.h>
+
+extern unsigned char software_suspend_enabled;
+
+#define NORESUME 1
+#define RESUME_SPECIFIED 2
#ifdef CONFIG_SOFTWARE_SUSPEND
/* page backup entry */
@@ -45,30 +49,61 @@
/* mm/page_alloc.c */
extern void drain_local_pages(void);
+/* kernel/suspend.c */
+extern void software_suspend(void);
+extern void software_resume(void);
+
+extern int register_suspend_notifier(struct notifier_block *);
+extern int unregister_suspend_notifier(struct notifier_block *);
+
extern unsigned int nr_copy_pages __nosavedata;
extern suspend_pagedir_t *pagedir_nosave __nosavedata;
+/* Communication between kernel/suspend.c and arch/i386/suspend.c */
+
+extern void do_magic_resume_1(void);
+extern void do_magic_resume_2(void);
+extern void do_magic_suspend_1(void);
+extern void do_magic_suspend_2(void);
+
/* Communication between acpi and arch/i386/suspend.c */
extern void do_suspend_lowlevel(int resume);
extern void do_suspend_lowlevel_s4bios(int resume);
#else /* CONFIG_SOFTWARE_SUSPEND */
-static inline int software_suspend(void)
+static inline void software_suspend(void)
{
+ printk("Warning: fake suspend called\n");
return -EPERM;
}
+#define software_resume() do { } while(0)
+#define register_suspend_notifier(a) do { } while(0)
+#define unregister_suspend_notifier(a) do { } while(0)
#endif /* CONFIG_SOFTWARE_SUSPEND */
#ifdef CONFIG_PM
extern void refrigerator(unsigned long);
+extern int freeze_processes(void);
+extern void thaw_processes(void);
+
+extern int pm_prepare_console(void);
+extern void pm_restore_console(void);
#else
static inline void refrigerator(unsigned long flag)
{
}
+static inline int freeze_processes(void)
+{
+ return 0;
+}
+static inline void thaw_processes(void)
+{
+
+}
#endif /* CONFIG_PM */
#endif /* _LINUX_SWSUSP_H */
Index: kernel/sys.c
===================================================================
RCS file: /home/pavel/sf/bitbucket/bkcvs/linux-2.5/kernel/sys.c,v
retrieving revision 1.60
diff -u -u -r1.60 sys.c
--- kernel/sys.c 21 Sep 2003 22:37:10 -0000 1.60
+++ kernel/sys.c 26 Sep 2003 10:53:27 -0000
@@ -456,8 +456,11 @@
#ifdef CONFIG_SOFTWARE_SUSPEND
case LINUX_REBOOT_CMD_SW_SUSPEND:
- if (!pm_suspend(PM_SUSPEND_DISK))
- break;
+ if (!software_suspend_enabled) {
+ unlock_kernel();
+ return -EAGAIN;
+ }
+ software_suspend();
do_exit(0);
break;
#endif
Index: kernel/power/main.c
===================================================================
RCS file: /home/pavel/sf/bitbucket/bkcvs/linux-2.5/kernel/power/main.c,v
retrieving revision 1.3
diff -u -u -r1.3 main.c
--- kernel/power/main.c 21 Aug 2003 23:44:53 -0000 1.3
+++ kernel/power/main.c 28 Sep 2003 17:50:10 -0000
@@ -172,7 +172,7 @@
static int pm_suspend_disk(void)
{
- int error;
+ int error = -EPERM;
pr_debug("PM: Attempting to suspend to disk.\n");
if (pm_disk_mode == PM_DISK_FIRMWARE)
@@ -183,6 +183,9 @@
pr_debug("PM: snapshotting memory.\n");
in_suspend = 1;
+#if 0
+ /* Patrick is likely to s/swsusp_/pmdisk_/ in next release,
+ but #if 0 is needed so that this compiles. */
if ((error = swsusp_save()))
goto Done;
@@ -195,6 +198,7 @@
} else
pr_debug("PM: Image restored successfully.\n");
swsusp_free();
+#endif
Done:
return error;
}
@@ -356,6 +360,9 @@
pr_debug("PM: Reading swsusp image.\n");
+#if 0
+ /* Patrick is likely to s/swsusp_/pmdisk_/ in next release,
+ but #if 0 is needed so that this compiles. */
if ((error = swsusp_read()))
goto Done;
@@ -371,6 +378,7 @@
suspend_finish(PM_SUSPEND_DISK);
Free:
swsusp_free();
+#endif
Done:
pr_debug("PM: Resume from disk failed.\n");
return 0;
Index: kernel/power/swsusp.c
===================================================================
RCS file: /home/pavel/sf/bitbucket/bkcvs/linux-2.5/kernel/power/swsusp.c,v
retrieving revision 1.4
diff -u -u -r1.4 swsusp.c
--- kernel/power/swsusp.c 21 Aug 2003 23:44:53 -0000 1.4
+++ kernel/power/swsusp.c 27 Sep 2003 20:52:00 -0000
@@ -5,7 +5,8 @@
* machine suspend feature using pretty near only high-level routines
*
* Copyright (C) 1998-2001 Gabor Kuti <seasons@fornax.hu>
- * Copyright (C) 1998,2001,2002 Pavel Machek <pavel@suse.cz>
+ * Copyright (C) 1998,2001-2003 Pavel Machek <pavel@suse.cz>
+ * Copyright (C) 2003 Patrick Mochel <mochel@osdl.org>
*
* I'd like to thank the following people for their work:
*
@@ -65,7 +66,9 @@
#include "power.h"
-unsigned char software_suspend_enabled = 1;
+extern long sys_sync(void);
+
+unsigned char software_suspend_enabled = 0;
#define __ADDRESS(x) ((unsigned long) phys_to_virt(x))
#define ADDRESS(x) __ADDRESS((x) << PAGE_SHIFT)
@@ -83,11 +86,14 @@
static int pagedir_order_check;
static int nr_copy_pages_check;
-static char resume_file[256]; /* For resume= kernel option */
+static int resume_status;
+static char resume_file[256] = ""; /* For resume= kernel option */
static dev_t resume_device;
/* Local variables that should not be affected by save */
unsigned int nr_copy_pages __nosavedata = 0;
+static int pm_suspend_state;
+
/* Suspend pagedir is allocated before final copy, therefore it
must be freed after resume
@@ -347,10 +353,15 @@
int pfn;
struct page *page;
+#ifdef CONFIG_DISCONTIGMEM
+ panic("Discontingmem not supported");
+#else
BUG_ON (max_pfn != num_physpages);
-
+#endif
for (pfn = 0; pfn < max_pfn; pfn++) {
page = pfn_to_page(pfn);
+ if (PageHighMem(page))
+ panic("Swsusp not supported on highmem boxes. Send 1GB of RAM to <pavel@ucw.cz> and try again ;-).");
if (!PageReserved(page)) {
if (PageNosave(page))
@@ -435,6 +446,74 @@
return pagedir;
}
+static int prepare_suspend_processes(void)
+{
+ sys_sync(); /* Syncing needs pdflushd, so do it before stopping processes */
+ if (freeze_processes()) {
+ printk( KERN_ERR "Suspend failed: Not all processes stopped!\n" );
+ thaw_processes();
+ return 1;
+ }
+ return 0;
+}
+
+/*
+ * Try to free as much memory as possible, but do not OOM-kill anyone
+ *
+ * Notice: all userland should be stopped at this point, or livelock is possible.
+ */
+static void free_some_memory(void)
+{
+ printk("Freeing memory: ");
+ while (shrink_all_memory(10000))
+ printk(".");
+ printk("|\n");
+}
+
+/* Make disk drivers accept operations, again */
+static void drivers_unsuspend(void)
+{
+ device_resume();
+}
+
+/* Called from process context */
+static int drivers_suspend(void)
+{
+ device_suspend(4);
+ if(!pm_suspend_state) {
+ if(pm_send_all(PM_SUSPEND,(void *)3)) {
+ printk(KERN_WARNING "Problem while sending suspend event\n");
+ return(1);
+ }
+ pm_suspend_state=1;
+ } else
+ printk(KERN_WARNING "PM suspend state already raised\n");
+ device_power_down(4);
+ return(0);
+}
+
+#define RESUME_PHASE1 1 /* Called from interrupts disabled */
+#define RESUME_PHASE2 2 /* Called with interrupts enabled */
+#define RESUME_ALL_PHASES (RESUME_PHASE1 | RESUME_PHASE2)
+static void drivers_resume(int flags)
+{
+ if (flags & RESUME_PHASE1) {
+ dpm_power_up();
+ }
+ if (flags & RESUME_PHASE2) {
+ device_resume();
+ if(pm_suspend_state) {
+ if(pm_send_all(PM_RESUME,(void *)0))
+ printk(KERN_WARNING "Problem while sending resume event\n");
+ pm_suspend_state=0;
+ } else
+ printk(KERN_WARNING "PM suspend state wasn't raised\n");
+
+#ifdef SUSPEND_CONSOLE
+ update_screen(fg_console); /* Hmm, is this the problem? */
+#endif
+ }
+}
static int suspend_prepare_image(void)
{
@@ -488,14 +567,13 @@
return 0;
}
-static int suspend_save_image(void)
+static void suspend_save_image(void)
{
- int error;
-
- device_resume();
+ drivers_unsuspend();
lock_swapdevices();
- error = write_suspend_image();
+ write_suspend_image();
+printk("locking_swapdevices\n");
lock_swapdevices(); /* This will unlock ignored swap devices since writing is finished */
/* It is important _NOT_ to umount filesystems at this point. We want
@@ -503,7 +581,30 @@
* filesystem clean: it is not. (And it does not matter, if we resume
* correctly, we'll mark system clean, anyway.)
*/
- return error;
+printk("exiting function\n");
+}
+
+static void suspend_power_down(void)
+{
+ extern int C_A_D;
+ C_A_D = 0;
+ printk(KERN_EMERG "%s%s Trying to power down.\n", name_suspend, TEST_SWSUSP ? "Disable TEST_SWSUSP. NOT ": "");
+#ifdef CONFIG_VT
+ PRINTK(KERN_EMERG "shift_state: %04x\n", shift_state);
+ mdelay(1000);
+ if (TEST_SWSUSP ^ (!!(shift_state & (1 << KG_CTRL))))
+ machine_restart(NULL);
+ else
+#endif
+ {
+ device_shutdown();
+ machine_power_off();
+ }
+
+ printk(KERN_EMERG "%sProbably not capable for powerdown. System halted.\n", name_suspend);
+ machine_halt();
+ while (1);
+ /* NOTREACHED */
}
/*
@@ -515,21 +616,32 @@
barrier();
mb();
spin_lock_irq(&suspend_pagedir_lock); /* Done to disable interrupts */
+
PRINTK( "Waiting for DMAs to settle down...\n");
- /* We do not want some readahead with DMA to corrupt our memory, right?
- Do it with disabled interrupts for best effect. That way, if some
- driver scheduled DMA, we have good chance for DMA to finish ;-). */
- mdelay(1000);
+ mdelay(1000); /* We do not want some readahead with DMA to corrupt our memory, right?
+ Do it with disabled interrupts for best effect. That way, if some
+ driver scheduled DMA, we have good chance for DMA to finish ;-). */
}
void do_magic_resume_2(void)
{
BUG_ON (nr_copy_pages_check != nr_copy_pages);
BUG_ON (pagedir_order_check != pagedir_order);
-
- /* Even mappings of "global" things (vmalloc) need to be fixed */
- __flush_tlb_global();
+
+ __flush_tlb_global(); /* Even mappings of "global" things (vmalloc) need to be fixed */
+
+ PRINTK( "Freeing prev allocated pagedir\n" );
+ free_suspend_pagedir((unsigned long) pagedir_save);
spin_unlock_irq(&suspend_pagedir_lock);
+ drivers_resume(RESUME_ALL_PHASES);
+
+ PRINTK( "Fixing swap signatures... " );
+ mark_swapfiles(((swp_entry_t) {0}), MARK_SWAP_RESUME);
+ PRINTK( "ok\n" );
+
+#ifdef SUSPEND_CONSOLE
+ update_screen(fg_console); /* Hmm, is this the problem? */
+#endif
}
/* do_magic() is implemented in arch/?/kernel/suspend_asm.S, and basically does:
@@ -554,28 +666,93 @@
{
mb();
barrier();
+ BUG_ON(in_atomic());
spin_lock_irq(&suspend_pagedir_lock);
}
-int do_magic_suspend_2(void)
+void do_magic_suspend_2(void)
{
int is_problem;
read_swapfiles();
is_problem = suspend_prepare_image();
spin_unlock_irq(&suspend_pagedir_lock);
- if (!is_problem)
- return suspend_save_image();
+ if (!is_problem) {
+ kernel_fpu_end(); /* save_processor_state() does kernel_fpu_begin, and we need to revert it in order to pass in_atomic() checks */
+ BUG_ON(in_atomic());
+ suspend_save_image();
+printk("leaving suspend_2\n");
+ suspend_power_down(); /* FIXME: if suspend_power_down is commented out, console is lost after few suspends ?! */
+ }
+
printk(KERN_EMERG "%sSuspend failed, trying to recover...\n", name_suspend);
+ MDELAY(1000); /* So user can wait and report us messages if armageddon comes :-) */
+
barrier();
mb();
+ spin_lock_irq(&suspend_pagedir_lock); /* Done to disable interrupts */
mdelay(1000);
- return -EFAULT;
+
+ free_pages((unsigned long) pagedir_nosave, pagedir_order);
+ spin_unlock_irq(&suspend_pagedir_lock);
+ mark_swapfiles(((swp_entry_t) {0}), MARK_SWAP_RESUME);
+}
+
+static void do_software_suspend(void)
+{
+ printk("Doing software_suspend()\n");
+ arch_prepare_suspend();
+ if (pm_prepare_console())
+ printk( "%sCan't allocate a console... proceeding\n", name_suspend);
+ if (!prepare_suspend_processes()) {
+
+ /* At this point, all user processes and "dangerous"
+ kernel threads are stopped. Free some memory, as we
+ need half of memory free. */
+
+ free_some_memory();
+
+ /* No need to invalidate any vfsmnt list --
+ * they will be valid after resume, anyway.
+ */
+ blk_run_queues();
+
+ /* Save state of all device drivers, and stop them. */
+ if(drivers_suspend()==0)
+ /* If stopping device drivers worked, we proceed basically into
+ * suspend_save_image.
+ *
+ * do_magic(0) returns after system is resumed.
+ *
+ * do_magic() copies all "used" memory to "free" memory, then
+ * unsuspends all device drivers, and writes memory to disk
+ * using normal kernel mechanism.
+ */
+ do_magic(0);
+ thaw_processes();
+ }
+ software_suspend_enabled = 1;
+ MDELAY(1000);
+ pm_restore_console();
+}
+
+/*
+ * This is main interface to the outside world. It needs to be
+ * called from process context.
+ */
+void software_suspend(void)
+{
+ if(!software_suspend_enabled)
+ return;
+
+ software_suspend_enabled = 0;
+ might_sleep();
+ do_software_suspend();
}
/* More restore stuff */
/* FIXME: Why not memcpy(to, from, 1<<pagedir_order*PAGE_SIZE)? */
-static void __init copy_pagedir(suspend_pagedir_t *to, suspend_pagedir_t *from)
+static void copy_pagedir(suspend_pagedir_t *to, suspend_pagedir_t *from)
{
int i;
char *topointer=(char *)to, *frompointer=(char *)from;
@@ -592,8 +769,8 @@
/*
* Returns true if given address/order collides with any orig_address
*/
-static int __init does_collide_order(suspend_pagedir_t *pagedir,
- unsigned long addr, int order)
+static int does_collide_order(suspend_pagedir_t *pagedir, unsigned long addr,
+ int order)
{
int i;
unsigned long addre = addr + (PAGE_SIZE<<order);
@@ -610,7 +787,7 @@
* We check here that pagedir & pages it points to won't collide with pages
* where we're going to restore from the loaded pages later
*/
-static int __init check_pagedir(void)
+static int check_pagedir(void)
{
int i;
@@ -628,7 +805,7 @@
return 0;
}
-static int __init relocate_pagedir(void)
+static int relocate_pagedir(void)
{
/*
* We have to avoid recursion (not to overflow kernel stack),
@@ -678,13 +855,13 @@
* I really don't think that it's foolproof but more than nothing..
*/
-static int __init sanity_check_failed(char *reason)
+static int sanity_check_failed(char *reason)
{
printk(KERN_ERR "%s%s\n",name_resume,reason);
return -EPERM;
}
-static int __init sanity_check(struct suspend_header *sh)
+static int sanity_check(struct suspend_header *sh)
{
if(sh->version_code != LINUX_VERSION_CODE)
return sanity_check_failed("Incorrect kernel version");
@@ -701,8 +878,7 @@
return 0;
}
-static int __init bdev_read_page(struct block_device *bdev,
- long pos, void *buf)
+static int bdev_read_page(struct block_device *bdev, long pos, void *buf)
{
struct buffer_head *bh;
BUG_ON (pos%PAGE_SIZE);
@@ -716,10 +892,31 @@
return 0;
}
+static int bdev_write_page(struct block_device *bdev, long pos, void *buf)
+{
+#if 0
+ struct buffer_head *bh;
+ BUG_ON (pos%PAGE_SIZE);
+ bh = __bread(bdev, pos/PAGE_SIZE, PAGE_SIZE);
+ if (!bh || (!bh->b_data)) {
+ return -1;
+ }
+ memcpy(bh->b_data, buf, PAGE_SIZE); /* FIXME: may need kmap() */
+ BUG_ON(!buffer_uptodate(bh));
+ generic_make_request(WRITE, bh);
+ if (!buffer_uptodate(bh))
+ printk(KERN_CRIT "%sWarning %s: Fixing swap signatures unsuccessful...\n", name_resume, resume_file);
+ wait_on_buffer(bh);
+ brelse(bh);
+ return 0;
+#endif
+ printk(KERN_CRIT "%sWarning %s: Fixing swap signatures unimplemented...\n", name_resume, resume_file);
+ return 0;
+}
+
extern dev_t __init name_to_dev_t(const char *line);
-static int __init read_suspend_image(struct block_device *bdev,
- union diskpage *cur)
+static int __read_suspend_image(struct block_device *bdev, union diskpage *cur, int noresume)
{
swp_entry_t next;
int i, nr_pgdir_pages;
@@ -744,9 +941,18 @@
else if (!memcmp("S2",cur->swh.magic.magic,2))
memcpy(cur->swh.magic.magic,"SWAPSPACE2",10);
else {
- printk("swsusp: %s: Unable to find suspended-data signature (%.10s - misspelled?\n",
+ if (noresume)
+ return -EINVAL;
+ panic("%sUnable to find suspended-data signature (%.10s - misspelled?\n",
name_resume, cur->swh.magic.magic);
- return -EFAULT;
+ }
+ if (noresume) {
+ /* We don't do a sanity check here: we want to restore the swap
+ whatever version of kernel made the suspend image;
+ We need to write swap, but swap is *not* enabled so
+ we must write the device directly */
+ printk("%s: Fixing swap signatures %s...\n", name_resume, resume_file);
+ bdev_write_page(bdev, 0, cur);
}
printk( "%sSignature found, resuming\n", name_resume );
@@ -796,115 +1002,125 @@
return 0;
}
-/**
- * swsusp_save - Snapshot memory
- */
-
-int swsusp_save(void)
-{
-#if defined (CONFIG_HIGHMEM) || defined (COFNIG_DISCONTIGMEM)
- printk("swsusp is not supported with high- or discontig-mem.\n");
- return -EPERM;
-#endif
- return 0;
-}
-
-
-/**
- * swsusp_write - Write saved memory image to swap.
- *
- * do_magic(0) returns after system is resumed.
- *
- * do_magic() copies all "used" memory to "free" memory, then
- * unsuspends all device drivers, and writes memory to disk
- * using normal kernel mechanism.
- */
-
-int swsusp_write(void)
-{
- arch_prepare_suspend();
- return do_magic(0);
-}
-
-
-/**
- * swsusp_read - Read saved image from swap.
- */
-
-int __init swsusp_read(void)
+static int read_suspend_image(const char * specialfile, int noresume)
{
union diskpage *cur;
+ unsigned long scratch_page = 0;
int error;
char b[BDEVNAME_SIZE];
- if (!strlen(resume_file))
- return -ENOENT;
-
- resume_device = name_to_dev_t(resume_file);
- printk("swsusp: Resume From Partition: %s, Device: %s\n",
- resume_file, __bdevname(resume_device, b));
-
- cur = (union diskpage *)get_zeroed_page(GFP_ATOMIC);
+ resume_device = name_to_dev_t(specialfile);
+ scratch_page = get_zeroed_page(GFP_ATOMIC);
+ cur = (void *) scratch_page;
if (cur) {
struct block_device *bdev;
+ printk("Resuming from device %s\n",
+ __bdevname(resume_device, b));
bdev = open_by_devnum(resume_device, FMODE_READ, BDEV_RAW);
- if (!IS_ERR(bdev)) {
+ if (IS_ERR(bdev)) {
+ error = PTR_ERR(bdev);
+ } else {
set_blocksize(bdev, PAGE_SIZE);
- error = read_suspend_image(bdev, cur);
+ error = __read_suspend_image(bdev, cur, noresume);
blkdev_put(bdev, BDEV_RAW);
- } else
- error = PTR_ERR(bdev);
- free_page((unsigned long)cur);
- } else
- error = -ENOMEM;
+ }
+ } else error = -ENOMEM;
- if (!error)
- PRINTK("Reading resume file was successful\n");
- else
- printk( "%sError %d resuming\n", name_resume, error );
+ if (scratch_page)
+ free_page(scratch_page);
+ switch (error) {
+ case 0:
+ PRINTK("Reading resume file was successful\n");
+ break;
+ case -EINVAL:
+ break;
+ case -EIO:
+ printk( "%sI/O error\n", name_resume);
+ break;
+ case -ENOENT:
+ printk( "%s%s: No such file or directory\n", name_resume, specialfile);
+ break;
+ case -ENOMEM:
+ printk( "%sNot enough memory\n", name_resume);
+ break;
+ default:
+ printk( "%sError %d resuming\n", name_resume, error );
+ }
MDELAY(1000);
return error;
}
-
/**
- * swsusp_restore - Replace running kernel with saved image.
+ * software_resume - Resume from a saved image.
+ *
+ * Called as a late_initcall (so all devices are discovered and
+ * initialized), we call swsusp to see if we have a saved image or not.
+ * If so, we quiesce devices, the restore the saved image. We will
+ * return above (in pm_suspend_disk() ) if everything goes well.
+ * Otherwise, we fail gracefully and return to the normally
+ * scheduled program.
+ *
*/
-
-int __init swsusp_restore(void)
+static void software_resume(void)
{
- return do_magic(1);
-}
+ if (num_online_cpus() > 1) {
+ printk(KERN_WARNING "Software Suspend has malfunctioning SMP support. Disabled :(\n");
+ return;
+ }
+ /* We enable the possibility of machine suspend */
+ software_suspend_enabled = 1;
+ if (!resume_status)
+ return;
+ printk( "%s", name_resume );
+ if (resume_status == NORESUME) {
+ if(resume_file[0])
+ read_suspend_image(resume_file, 1);
+ printk( "disabled\n" );
+ return;
+ }
+ MDELAY(1000);
-/**
- * swsusp_free - Free memory allocated to hold snapshot.
- */
+ if (pm_prepare_console())
+ printk("swsusp: Can't allocate a console... proceeding\n");
-int swsusp_free(void)
-{
- PRINTK( "Freeing prev allocated pagedir\n" );
- free_suspend_pagedir((unsigned long) pagedir_save);
+ if (!resume_file[0] && resume_status == RESUME_SPECIFIED) {
+ printk( "suspension device unspecified\n" );
+ return;
+ }
- PRINTK( "Fixing swap signatures... " );
- mark_swapfiles(((swp_entry_t) {0}), MARK_SWAP_RESUME);
- PRINTK( "ok\n" );
- return 0;
+ printk( "resuming from %s\n", resume_file);
+ if (read_suspend_image(resume_file, 0))
+ goto read_failure;
+ do_magic(1);
+ panic("This never returns");
+
+read_failure:
+ pm_restore_console();
+ return;
}
+late_initcall(software_resume);
+
static int __init resume_setup(char *str)
{
- if (strlen(str))
- strncpy(resume_file, str, 255);
+ if (resume_status == NORESUME)
+ return 1;
+
+ strncpy( resume_file, str, 255 );
+ resume_status = RESUME_SPECIFIED;
+
return 1;
}
static int __init noresume_setup(char *str)
{
- resume_file[0] = '\0';
+ resume_status = NORESUME;
return 1;
}
__setup("noresume", noresume_setup);
__setup("resume=", resume_setup);
+EXPORT_SYMBOL(software_suspend);
+EXPORT_SYMBOL(software_suspend_enabled);
--
When do you have a heart between your knees?
[Johanka's followup: and *two* hearts?]
^ permalink raw reply [flat|nested] 16+ messages in thread