suspend-to-{RAM,disk} for 2.5.17

@@ -44,6 +44,8 @@
 #include <asm/pgalloc.h>
 #include <asm/io_apic.h>
 #include <asm/tlbflush.h>
+#define ACPI_C
+#include <asm/suspend.h>
 
 
 #define PREFIX			"ACPI: "

@@ -621,6 +623,34 @@
 {
 	acpi_wakeup_address = (unsigned long)alloc_bootmem_low(PAGE_SIZE);
 	printk(KERN_DEBUG "ACPI: have wakeup address 0x%8.8lx\n", acpi_wakeup_address);
+}
+
+/*
+ * (KG): Since we affect stack here, we make this function as flat and easy
+ * as possible in order to not provoke gcc to use local variables on the stack.
+ * Note that on resume, all (expect nosave) variables will have the state from
+ * the time of writing (suspend_save_image) and the registers (including the
+ * stack pointer, but excluding the instruction pointer) will be loaded with 
+ * the values saved at save_processor_context() time.
+ */
+void do_suspend_magic(int resume)
+{
+	/* DANGER WILL ROBINSON!
+	 *
+	 * If this function is too difficult for gcc to optimize, it will crash and burn!
+	 * see above.
+	 *
+	 * DO NOT TOUCH.
+	 */
+	if (!resume) {
+		save_processor_context();
+		acpi_save_register_state((unsigned long)&&acpi_sleep_done);
+		acpi_enter_sleep_state(3);
+		return;
+	}
+acpi_sleep_done:
+	restore_processor_context();
+	printk("CPU context restored...\n");
 }
 
 #endif /*CONFIG_ACPI_SLEEP*/

@@ -1667,6 +1667,7 @@
 	daemonize();
 
 	strcpy(current->comm, "kapmd");
+	current->flags |= PF_IOTHREAD;
 	sigfillset(&current->blocked);
 
 	if (apm_info.connection_version == 0) {

@@ -11,6 +11,7 @@
 #include <linux/smp_lock.h>
 #include <linux/init.h>
 #include <linux/kernel_stat.h>
+#include <linux/device.h>
 
 #include <asm/atomic.h>
 #include <asm/system.h>

@@ -237,7 +238,19 @@
 	}
 }
 
-void __init init_8259A(int auto_eoi)
+static struct device device_i8259A = {
+	name:	       	"i8259A",
+	bus_id:		"0020",
+};
+
+static void __init init_8259A_devicefs(void)
+{
+	register_sys_device(&device_i8259A);
+}
+
+__initcall(init_8259A_devicefs);
+
+void init_8259A(int auto_eoi)
 {
 	unsigned long flags;
 

@@ -168,6 +168,8 @@
 static int disable_x86_serial_nr __initdata = 1;
 static int disable_x86_fxsr __initdata = 0;
 
+extern unsigned long saved_videomode;
+
 /*
  * This is set up by the setup-routine at boot-time
  */

@@ -182,6 +184,7 @@
 #define SYS_DESC_TABLE (*(struct sys_desc_table_struct*)(PARAM+0xa0))
 #define MOUNT_ROOT_RDONLY (*(unsigned short *) (PARAM+0x1F2))
 #define RAMDISK_FLAGS (*(unsigned short *) (PARAM+0x1F8))
+#define VIDEO_MODE (*(unsigned short *) (PARAM+0x1FA))
 #define ORIG_ROOT_DEV (*(unsigned short *) (PARAM+0x1FC))
 #define AUX_DEVICE_INFO (*(unsigned char *) (PARAM+0x1FF))
 #define LOADER_TYPE (*(unsigned char *) (PARAM+0x210))

@@ -681,6 +684,8 @@
  	drive_info = DRIVE_INFO;
  	screen_info = SCREEN_INFO;
 	apm_info.bios = APM_BIOS_INFO;
+	saved_videomode = VIDEO_MODE;
+	printk("Video mode to be used for restore is %lx\n", saved_videomode);
 	if( SYS_DESC_TABLE.length != 0 ) {
 		MCA_bus = SYS_DESC_TABLE.table[3] &0x2;
 		machine_id = SYS_DESC_TABLE.table[0];

@@ -21,6 +21,7 @@
 #include <linux/tty.h>
 #include <linux/personality.h>
 #include <linux/binfmts.h>
+#include <linux/suspend.h>
 #include <asm/ucontext.h>
 #include <asm/uaccess.h>
 #include <asm/i387.h>

@@ -594,6 +595,11 @@
 	if ((regs->xcs & 3) != 3)
 		return 1;
 
+	if (current->flags & PF_FREEZE) {
+		refrigerator(0);
+		goto no_signal;
+	}
+
 	if (!oldset)
 		oldset = &current->blocked;
 

@@ -701,6 +707,7 @@
 		return 1;
 	}
 
+ no_signal:
 	/* Did we come from a system call? */
 	if (regs->orig_eax >= 0) {
 		/* Restart the system call - no handlers present */

diff -ur -x .dep* -x .hdep* -x *.[oas] -x *~ -x #* -x *CVS* -x *.orig -x *.rej -x *.old -x .menu* -x asm -x local.h -x System.map -x autoconf.h -x compile.h -x version.h -x .version -x defkeymap.c -x uni_hash.tbl -x zImage -x vmlinux -x vmlinuz -x TAGS -x bootsect -x *RCS* -x conmakehash -x map -x build -x build -x configure -x *target* -x *.flags -x *.bak clean/arch/i386/kernel/time.c linux-swsusp/arch/i386/kernel/time.c
@@ -42,6 +42,7 @@
 #include <linux/init.h>
 #include <linux/smp.h>
 #include <linux/module.h>
+#include <linux/device.h>
 
 #include <asm/io.h>
 #include <asm/smp.h>

@@ -635,6 +636,17 @@
 bad_ctc:
 	return 0;
 }
+
+static struct device device_i8253;
+
+static void time_init_driverfs(void)
+{
+	strcpy(device_i8253.name, "i8253");
+	strcpy(device_i8253.bus_id, "0040");
+	register_sys_device(&device_i8253);
+}
+
+__initcall(time_init_driverfs);
 
 void __init time_init(void)
 {

@@ -33,6 +33,7 @@
 #include <linux/delay.h>
 #include <linux/sysrq.h>
 #include <linux/pm.h>
+#include <linux/device.h>
 #include <asm/uaccess.h>
 #include <asm/acpi.h>
 #include "acpi_bus.h"

@@ -128,6 +129,12 @@
 	/* restore device context */
 	device_resume(RESUME_RESTORE_STATE);
 #endif
+
+	if (dmi_broken & BROKEN_INIT_AFTER_S1) {
+		printk("Broken toshiba laptop -> kicking interrupts\n");
+		init_8259A(0);
+	}
+
 	return AE_OK;
 }
 

@@ -254,23 +261,21 @@
 	switch (state)
 	{
 	case ACPI_STATE_S1:
-		/* do nothing */
+		barrier();
+		status = acpi_enter_sleep_state(state);
 		break;
 
 	case ACPI_STATE_S2:
 	case ACPI_STATE_S3:
-		acpi_save_register_state((unsigned long)&&acpi_sleep_done);
+		do_suspend_magic(0);
 		break;
 	}
 
-	barrier();
-	status = acpi_enter_sleep_state(state);
-
-acpi_sleep_done:
-
+	printk("acpi_restore_register_state...");
 	acpi_restore_register_state();
 	restore_flags(flags);
 
+	printk("acpi returning...");
 	return status;
 }
 

@@ -290,6 +295,8 @@
 	if (state < ACPI_STATE_S1 || state > ACPI_STATE_S5)
 		return AE_ERROR;
 
+	freeze_processes();
+
 	/* do we have a wakeup address for S2 and S3? */
 	if (state == ACPI_STATE_S2 || state == ACPI_STATE_S3) {
 		if (!acpi_wakeup_address)

@@ -315,7 +322,9 @@
 	 * no matter what.
 	 */
 	acpi_system_restore_state(state);
+	printk("acpi_leave_sleep_state...");
 	acpi_leave_sleep_state(state);
+	printk("ook\n");
 
 	/* make sure interrupts are enabled */
 	ACPI_ENABLE_IRQS();

@@ -323,6 +332,8 @@
 	/* reset firmware waking vector */
 	acpi_set_firmware_waking_vector((ACPI_PHYSICAL_ADDRESS) 0);
 
+	thaw_processes();
+
 	return status;
 }
 

@@ -700,8 +773,17 @@
 	
 	if (!system->states[state])
 		return_VALUE(-ENODEV);
+
 	
+#ifdef CONFIG_SOFTWARE_SUSPEND
+	if (state == 4) {
+		/* We are working from process context, that's why we may call it directly. */ 
+		do_software_suspend();
+		return_VALUE(count);
+	}
+#endif
 	status = acpi_suspend(state);
+
 	if (ACPI_FAILURE(status))
 		return_VALUE(-ENODEV);
 	

@@ -1180,6 +1262,10 @@
 		}
 	}
 	printk(")\n");
+#ifdef CONFIG_SOFTWARE_SUSPEND
+	printk(KERN_INFO "Software suspend => we can do S4.");
+	system->states[4] = 1;
+#endif
 
 #ifdef CONFIG_PM
 	/* Install the soft-off (S5) handler. */

@@ -173,6 +173,7 @@
 #include <linux/interrupt.h>
 #include <linux/init.h>
 #include <linux/devfs_fs_kernel.h>
+#include <linux/device.h>
 
 /*
  * PS/2 floppies have much slower step rates than regular floppies.

@@ -4178,11 +4179,15 @@
 
 static int have_no_fdc= -ENODEV;
 
+static struct device device_floppy;
 
 int __init floppy_init(void)
 {
 	int i,unit,drive;
 
+	strcpy(device_floppy.name, "floppy");
+	strcpy(device_floppy.bus_id, "03?0");
+	register_sys_device(&device_floppy);
 
 	raw_cmd = NULL;
 

@@ -1418,7 +1419,9 @@
 	req->buffer = bio_data(bio);	/* see ->buffer comment above */
 	req->waiting = NULL;
 	req->bio = req->biotail = bio;
-	req->rq_dev = to_kdev_t(bio->bi_bdev->bd_dev);
+	if (bio->bi_bdev)
+		req->rq_dev = to_kdev_t(bio->bi_bdev->bd_dev);
+	else	req->rq_dev = NODEV;
 	add_request(q, req, insert_here);
 out:
 	if (freereq)

@@ -71,11 +71,11 @@
 #include <linux/smp_lock.h>
 #include <linux/swap.h>
 #include <linux/slab.h>
+#include <linux/loop.h>
+#include <linux/suspend.h>
 
 #include <asm/uaccess.h>
 
-#include <linux/loop.h>		
-
 #define MAJOR_NR LOOP_MAJOR
 
 static int max_loop = 8;

@@ -534,6 +534,7 @@
 	daemonize();
 
 	sprintf(current->comm, "loop%d", lo->lo_number);
+	current->flags |= PF_IOTHREAD;
 
 	spin_lock_irq(&current->sigmask_lock);
 	sigfillset(&current->blocked);

@@ -27,6 +27,7 @@
 #include <linux/quotaops.h>
 #include <linux/smp_lock.h>
 #include <linux/module.h>
+#include <linux/suspend.h>
 
 #include <linux/spinlock.h>
 

@@ -317,6 +318,22 @@
 	action_msg:	"Kill All Tasks",
 };
 
+#ifdef CONFIG_SOFTWARE_SUSPEND
+static void sysrq_handle_swsusp(int key, struct pt_regs *pt_regs,
+		struct kbd_struct *kbd, struct tty_struct *tty) {
+        if(!software_suspend_enabled) {
+		printk("Software Suspend is not possible now\n");
+		return;
+	}
+	software_suspend();
+}
+static struct sysrq_key_op sysrq_swsusp_op = {
+	handler:	sysrq_handle_swsusp,
+	help_msg:	"suspenD",
+	action_msg:	"Software suspend\n",
+};
+#endif
+
 /* END SIGNAL SYSRQ HANDLERS BLOCK */
 
 

@@ -339,7 +356,11 @@
 		 and will never arive */
 /* b */	&sysrq_reboot_op,
 /* c */	NULL,
+#ifdef CONFIG_SOFTWARE_SUSPEND
+/* d */	&sysrq_swsusp_op,
+#else
 /* d */	NULL,
+#endif
 /* e */	&sysrq_term_op,
 /* f */	NULL,
 /* g */	NULL,

@@ -27,6 +27,7 @@
 #include <linux/slab.h>
 #include <linux/delay.h>
 #include <linux/ide.h>
+#include <linux/suspend.h>
 
 #include <asm/byteorder.h>
 #include <asm/irq.h>

@@ -561,6 +562,8 @@
 	/* I hope that every freeze operations from the upper levels have
 	 * already been done...
 	 */
+
+	BUG_ON(in_interrupt());
 
 	if (level != SUSPEND_SAVE_STATE)
 		return 0;

@@ -110,7 +110,7 @@
 	return error;
 }
 
-static int pci_pm_suspend(u32 state)
+int pci_pm_suspend(u32 state)
 {
 	struct list_head *list;
 	struct pci_bus *bus;

@@ -123,7 +123,7 @@
 	return 0;
 }
 
-static int pci_pm_resume(void)
+int pci_pm_resume(void)
 {
 	struct list_head *list;
 	struct pci_bus *bus;

@@ -323,6 +323,7 @@
 	/* avoid getting signals */
 	spin_lock_irq(&current->sigmask_lock);
 	flush_signals(current);
+	current->flags |= PF_IOTHREAD;
 	sigfillset(&current->blocked);
 	recalc_sigpending();
 	spin_unlock_irq(&current->sigmask_lock);

@@ -32,6 +32,7 @@
 #include <linux/writeback.h>
 #include <linux/mempool.h>
 #include <linux/hash.h>
+#include <linux/suspend.h>
 #include <asm/bitops.h>
 
 #define BH_ENTRY(list) list_entry((list), struct buffer_head, b_assoc_buffers)

@@ -122,6 +123,8 @@
 	smp_mb__after_clear_bit();
 	wake_up_buffer(bh);
 }
+
+DECLARE_TASK_QUEUE(tq_bdflush);
 
 /*
  * Block until a buffer comes unlocked.  This doesn't stop it

@@ -32,6 +32,7 @@
 #include <linux/init.h>
 #include <linux/mm.h>
 #include <linux/slab.h>
+#include <linux/suspend.h>
 #include <linux/pagemap.h>
 #include <asm/uaccess.h>
 #include <linux/proc_fs.h>

@@ -225,6 +226,7 @@
 			journal->j_commit_interval / HZ);
 	list_add(&journal->j_all_journals, &all_journals);
 
+	current->flags |= PF_KERNTHREAD;
 	/* And now, wait forever for commit wakeup events. */
 	while (1) {
 		if (journal->j_flags & JFS_UNMOUNT)

@@ -245,7 +247,15 @@
 		}
 
 		wake_up(&journal->j_wait_done_commit);
-		interruptible_sleep_on(&journal->j_wait_commit);
+		if (current->flags & PF_FREEZE) { /* The simpler the better. Flushing journal isn't a
+						     good idea, because that depends on threads that
+						     may be already stopped. */
+			jbd_debug(1, "Now suspending kjournald\n");
+			refrigerator(PF_IOTHREAD);
+			jbd_debug(1, "Resuming kjournald\n");						
+		} else		/* we assume on resume that commits are already there,
+				   so we don't sleep */
+			interruptible_sleep_on(&journal->j_wait_commit);
 
 		jbd_debug(1, "kjournald wakes\n");
 

@@ -57,6 +57,7 @@
 #include <linux/stat.h>
 #include <linux/string.h>
 #include <linux/smp_lock.h>
+#include <linux/suspend.h> 
 
 /* the number of mounted filesystems.  This is used to decide when to
 ** start and kill the commit thread

@@ -1886,6 +1887,7 @@
   spin_unlock_irq(&current->sigmask_lock);
 
   sprintf(current->comm, "kreiserfsd") ;
+  current->flags |= PF_KERNTHREAD;
   lock_kernel() ;
   while(1) {
 

@@ -1899,7 +1901,12 @@
       break ;
     }
     wake_up(&reiserfs_commit_thread_done) ;
-    interruptible_sleep_on_timeout(&reiserfs_commit_thread_wait, 5 * HZ) ;
+#ifdef CONFIG_SOFTWARE_SUSPEND
+    if (current->flags & PF_FREEZE) {
+	    refrigerator(PF_IOTHREAD);
+    } else
+#endif
+	    interruptible_sleep_on_timeout(&reiserfs_commit_thread_wait, 5 * HZ) ;
   }
   unlock_kernel() ;
   wake_up(&reiserfs_commit_thread_done) ;

@@ -51,6 +51,12 @@
 	return ((mask & *addr) != 0);
 }
 
+/*
+ * fls: find last bit set.
+ */
+
+#define fls(x) generic_fls(x)
+
 #ifdef __KERNEL__
 
 /*

@@ -414,6 +414,12 @@
 	return word;
 }
 
+/*
+ * fls: find last bit set.
+ */
+
+#define fls(x) generic_fls(x)
+
 #ifdef __KERNEL__
 
 /*

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@@ -169,6 +169,9 @@
 
 #endif
 
+/* Data marked not to be saved by software_suspend() */
+#define __nosavedata __attribute__ ((__section__ (".data.nosave")))
+
 #ifdef CONFIG_HOTPLUG
 #define __devinit
 #define __devinitdata

@@ -64,6 +64,7 @@
 
 #define PG_private		12	/* Has something at ->private */
 #define PG_writeback		13	/* Page is under writeback */
+#define PG_nosave		15	/* Used for system suspend/resume */
 
 /*
  * Global page accounting.  One instance per CPU.

@@ -206,6 +207,12 @@
 			dec_page_state(nr_writeback);			\
 		ret;							\
 	})
+
+#define PageNosave(page)	test_bit(PG_nosave, &(page)->flags)
+#define SetPageNosave(page)	set_bit(PG_nosave, &(page)->flags)
+#define TestSetPageNosave(page)	test_and_set_bit(PG_nosave, &(page)->flags)
+#define ClearPageNosave(page)		clear_bit(PG_nosave, &(page)->flags)
+#define TestClearPageNosave(page)	test_and_clear_bit(PG_nosave, &(page)->flags)
 
 /*
  * The PageSwapCache predicate doesn't use a PG_flag at this time,

@@ -20,6 +20,7 @@
  * CAD_OFF     Ctrl-Alt-Del sequence sends SIGINT to init task.
  * POWER_OFF   Stop OS and remove all power from system, if possible.
  * RESTART2    Restart system using given command string.
+ * SW_SUSPEND  Suspend system using Software Suspend if compiled in
  */
 
 #define	LINUX_REBOOT_CMD_RESTART	0x01234567

@@ -28,6 +29,7 @@
 #define	LINUX_REBOOT_CMD_CAD_OFF	0x00000000
 #define	LINUX_REBOOT_CMD_POWER_OFF	0x4321FEDC
 #define	LINUX_REBOOT_CMD_RESTART2	0xA1B2C3D4
+#define	LINUX_REBOOT_CMD_SW_SUSPEND	0xD000FCE2
 
 
 #ifdef __KERNEL__

@@ -45,6 +47,13 @@
 extern void machine_restart(char *cmd);
 extern void machine_halt(void);
 extern void machine_power_off(void);
+
+/*
+ * Architecture-independent suspend facility
+ */
+
+extern void software_suspend(void);
+extern unsigned char software_suspend_enabled;
 
 #endif
 

@@ -388,6 +388,11 @@
 #define PF_FLUSHER	0x00004000	/* responsible for disk writeback */
 #define PF_RADIX_TREE	0x00008000	/* debug: performing radix tree alloc */
 
+#define PF_FREEZE	0x00010000	/* this task should be frozen for suspend */
+#define PF_IOTHREAD	0x00020000	/* this thread is needed for doing I/O to swap */
+#define PF_KERNTHREAD	0x00040000	/* this thread is a kernel thread that cannot be sent signals to */
+#define PF_FROZEN	0x00080000	/* frozen for system suspend */
+
 /*
  * Ptrace flags
  */

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@@ -66,7 +66,7 @@
 #define DECLARE_TASK_QUEUE(q)	LIST_HEAD(q)
 #define TQ_ACTIVE(q)		(!list_empty(&q))
 
-extern task_queue tq_timer, tq_immediate, tq_disk;
+extern task_queue tq_timer, tq_immediate, tq_disk, tq_bdflush;
 
 /*
  * To implement your own list of active bottom halfs, use the following

@@ -10,6 +10,7 @@
 #include <linux/fd.h>
 #include <linux/tty.h>
 #include <linux/init.h>
+#include <linux/suspend.h>
 
 #include <linux/nfs_fs.h>
 #include <linux/nfs_fs_sb.h>

@@ -825,6 +826,11 @@
 #endif
 
 	create_dev("/dev/root", ROOT_DEV, NULL);
+
+	/* This has to be before mounting root, because even readonly mount of reiserfs would replay
+	   log corrupting stuff */
+	software_resume();
+
 	if (mount_initrd) {
 		if (initrd_load() && !kdev_same(ROOT_DEV, mk_kdev(RAMDISK_MAJOR, 0))) {
 			handle_initrd();

@@ -72,6 +72,7 @@
 
 	daemonize();
 	strcpy(curtask->comm, "keventd");
+	current->flags |= PF_IOTHREAD;
 	keventd_running = 1;
 	keventd_task = curtask;
 

@@ -493,7 +493,7 @@
  * No need to set need_resched since signal event passing
  * goes through ->blocked
  */
-static inline void signal_wake_up(struct task_struct *t)
+inline void signal_wake_up(struct task_struct *t)
 {
 	set_tsk_thread_flag(t,TIF_SIGPENDING);
 

@@ -365,6 +365,7 @@
 
 	daemonize();
 	set_user_nice(current, 19);
+	current->flags |= PF_IOTHREAD;
 	sigfillset(&current->blocked);
 
 	/* Migrate to the right CPU */

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@@ -4,6 +4,7 @@
  *  Copyright (C) 1991, 1992  Linus Torvalds
  */
 
+#include <linux/config.h>
 #include <linux/module.h>
 #include <linux/mm.h>
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@@ -86,15 +86,11 @@
  *  - it's marked as being swap-cache
  *  - it's associated with the swap inode
  */
-extern long suspend_device;
 void rw_swap_page(int rw, struct page *page)
 {
 	swp_entry_t entry;
 
 	entry.val = page->index;
-
-	if (suspend_device)
-		panic("I refuse to corrupt memory/swap.");
 
 	if (!PageLocked(page))
 		PAGE_BUG(page);

@@ -34,6 +34,7 @@
 #include <linux/sysrq.h>
 #include <linux/pm.h>
 #include <linux/device.h>
+#include <linux/suspend.h>
 #include <asm/uaccess.h>
 #include <asm/acpi.h>
 #include "acpi_bus.h"

@@ -60,6 +60,8 @@
 #define register_suspend_notifier(a)	do { } while(0)
 #define unregister_suspend_notifier(a)	do { } while(0)
 #define refrigerator(a)			do { BUG(); } while(0)
+#define freeze_processes()		do { panic("You need CONFIG_SOFTWARE_SUSPEND to do sleeps."); } while(0)
+#define thaw_processes()		do { } while(0)
 #endif
 
 #endif /* _LINUX_SWSUSP_H */