Swsusp updates, do not thrash ide disk on suspend

Swsusp updates, do not thrash ide disk on suspend

[Pavel Machek]

Hi!

This cleans up swsusp a little bit and fixes ide disk corruption on
suspend/resume. Please apply,
									Pavel
--- clean/Documentation/swsusp.txt	2002-07-09 04:54:06.000000000 +0200
+++ linux-swsusp/Documentation/swsusp.txt	2002-09-25 21:14:42.000000000 +0200
@@ -156,6 +156,23 @@
 - do IDE cdroms need some kind of support?
 - IDE CD-RW -- how to deal with that?
 
+FAQ:
+
+Q: well, suspending a server is IMHO a really stupid thing,
+but... (Diego Zuccato):
+
+A: You bought new UPS for your server. How do you install it without
+bringing machine down? Suspend to disk, rearrange power cables,
+resume.
+
+You have your server on UPS. Power died, and UPS is indicating 30
+seconds to failure. What do you do? Suspend to disk.
+
+Ethernet card in your server died. You want to replace it. Your
+server is not hotplug capable. What do you do? Suspend to disk,
+replace ethernet card, resume. If you are fast your users will not
+even see broken connections.
+
 Any other idea you might have tell me!
 
 Contacting the author
--- clean/drivers/ide/ide-disk.c	2002-09-23 00:09:13.000000000 +0200
+++ linux-swsusp/drivers/ide/ide-disk.c	2002-10-01 23:58:17.000000000 +0200
@@ -544,6 +544,7 @@
  */
 static ide_startstop_t do_rw_disk (ide_drive_t *drive, struct request *rq, unsigned long block)
 {
+	BUG_ON(drive->blocked);
 	if (!blk_fs_request(rq)) {
 		blk_dump_rq_flags(rq, "do_rw_disk - bad command");
 		ide_end_request(drive, 0, 0);
@@ -1495,8 +1496,70 @@
  	ide_add_setting(drive,	"max_failures",		SETTING_RW,					-1,			-1,			TYPE_INT,	0,	65535,				1,	1,	&drive->max_failures,		NULL);
 }
 
+static int idedisk_suspend(struct device *dev, u32 state, u32 level)
+{
+	ide_drive_t *drive = dev->driver_data;
+
+	printk("Suspending device %lx\n", dev->driver_data);
+
+	/* I hope that every freeze operation from the upper levels have
+	 * already been done...
+	 */
+
+	if (level != SUSPEND_SAVE_STATE)
+		return 0;
+	BUG_ON(in_interrupt());
+
+	printk("Waiting for commands to finish\n");
+
+	/* wait until all commands are finished */
+	/* FIXME: waiting for spinlocks should be done instead. */
+	if (!(HWGROUP(drive)))
+		printk("No hwgroup?\n");
+	while (HWGROUP(drive)->handler)
+		yield();
+
+	/* set the drive to standby */
+	printk(KERN_INFO "suspending: %s ", drive->name);
+	if (drive->driver) {
+		if (drive->driver->standby)
+			drive->driver->standby(drive);
+	}
+	drive->blocked = 1;
+
+	while (HWGROUP(drive)->handler)
+		yield();
+
+	return 0;
+}
+
+static int idedisk_resume(struct device *dev, u32 level)
+{
+	ide_drive_t *drive = dev->driver_data;
+
+	if (level != RESUME_RESTORE_STATE)
+		return 0;
+	if (!drive->blocked)
+		panic("ide: Resume but not suspended?\n");
+
+	drive->blocked = 0;
+	return 0;
+}
+
+
+/* This is just a hook for the overall driver tree.
+ */
+
+static struct device_driver idedisk_devdrv = {
+	.bus = &ide_bus_type,
+	.name = "IDE disk driver",
+
+	.suspend = idedisk_suspend,
+	.resume = idedisk_resume,
+};
+
 static int idedisk_ioctl (ide_drive_t *drive, struct inode *inode,
-		struct file *file, unsigned int cmd, unsigned long arg)
+	struct file *file, unsigned int cmd, unsigned long arg)
 {
 #if 0
 HDIO_GET_ADDRESS
@@ -1540,6 +1603,11 @@
 			drive->doorlocking = 1;
 		}
 	}
+	{
+		sprintf(drive->disk->disk_dev.name, "ide-disk");
+		drive->disk->disk_dev.driver = &idedisk_devdrv;
+		drive->disk->disk_dev.driver_data = drive;
+	}
 
 #if 1
 	(void) probe_lba_addressing(drive, 1);
@@ -1623,6 +1691,8 @@
 static int idedisk_cleanup (ide_drive_t *drive)
 {
 	struct gendisk *g = drive->disk;
+
+	put_device(&drive->disk->disk_dev);
 	if ((drive->id->cfs_enable_2 & 0x3000) && drive->wcache)
 		if (do_idedisk_flushcache(drive))
 			printk (KERN_INFO "%s: Write Cache FAILED Flushing!\n",
@@ -1721,6 +1791,7 @@
 static int idedisk_init (void)
 {
 	ide_register_driver(&idedisk_driver);
+	driver_register(&idedisk_devdrv);
 	return 0;
 }
 
--- clean/drivers/ide/ide-pnp.c	2002-09-21 13:20:44.000000000 +0200
+++ linux-swsusp/drivers/ide/ide-pnp.c	2002-09-25 21:14:42.000000000 +0200
@@ -52,6 +52,7 @@
 static int __init pnpide_generic_init(struct pci_dev *dev, int enable)
 {
 	hw_regs_t hw;
+	ide_hwif_t *hwif;
 	int index;
 
 	if (!enable)
@@ -67,10 +68,11 @@
 //			generic_pnp_ide_iops,
 			DEV_IRQ(dev, 0));
 
-	index = ide_register_hw(&hw, NULL);
+	index = ide_register_hw(&hw, &hwif);
 
 	if (index != -1) {
 	    	printk(KERN_INFO "ide%d: %s IDE interface\n", index, DEV_NAME(dev));
+		hwif->pci_dev = dev;
 		return 0;
 	}
 
--- clean/drivers/ide/ide-probe.c	2002-09-23 00:09:13.000000000 +0200
+++ linux-swsusp/drivers/ide/ide-probe.c	2002-09-25 21:14:42.000000000 +0200
@@ -46,6 +46,7 @@
 #include <linux/delay.h>
 #include <linux/ide.h>
 #include <linux/spinlock.h>
+#include <linux/pci.h>
 
 #include <asm/byteorder.h>
 #include <asm/irq.h>
@@ -566,6 +567,11 @@
 	/* register with global device tree */
 	strncpy(hwif->gendev.bus_id,hwif->name,BUS_ID_SIZE);
 	snprintf(hwif->gendev.name,DEVICE_NAME_SIZE,"IDE Controller");
+	hwif->gendev.driver_data = hwif;
+	if (hwif->pci_dev)
+		hwif->gendev.parent = &hwif->pci_dev->dev;
+	else
+		hwif->gendev.parent = NULL; /* Would like to do = &device_legacy */
 	device_register(&hwif->gendev);
 
 	if (hwif->mmio == 2)
--- clean/include/linux/ide.h	2002-09-23 00:09:14.000000000 +0200
+++ linux-swsusp/include/linux/ide.h	2002-09-25 21:14:42.000000000 +0200
@@ -17,6 +17,7 @@
 #include <linux/interrupt.h>
 #include <linux/bitops.h>
 #include <linux/bio.h>
+#include <linux/device.h>
 #include <linux/pci.h>
 #include <asm/byteorder.h>
 #include <asm/system.h>
@@ -789,6 +790,7 @@
 	unsigned autotune	: 2;	/* 1=autotune, 2=noautotune, 0=default */
 	unsigned remap_0_to_1	: 2;	/* 0=remap if ezdrive, 1=remap, 2=noremap */
 	unsigned ata_flash	: 1;	/* 1=present, 0=default */
+	unsigned blocked        : 1;	/* 1=powermanagment told us not to do anything, so sleep nicely */
 	unsigned addressing;		/*      : 3;
 					 *  0=28-bit
 					 *  1=48-bit
--- clean/kernel/suspend.c	2002-09-30 20:33:52.000000000 +0200
+++ linux-swsusp/kernel/suspend.c	2002-09-30 20:36:03.000000000 +0200
@@ -470,19 +470,22 @@
 	int nr_copy_pages = 0;
 	int pfn;
 	struct page *page;
-
-#ifndef CONFIG_DISCONTIGMEM	
-	if (max_mapnr != num_physpages)
-		panic("mapnr is not expected");
+	
+#ifdef CONFIG_DISCONTIGMEM
+	panic("Discontingmem not supported");
+#else
+	BUG_ON (max_mapnr != num_physpages);
 #endif
-	for (pfn = 0; pfn < num_physpages; pfn++) {
+	for (pfn = 0; pfn < max_mapnr; 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))
 				continue;
 
+
 			if ((chunk_size=is_head_of_free_region(page))!=0) {
 				pfn += chunk_size - 1;
 				continue;
@@ -776,9 +789,10 @@
 	BUG_ON (nr_copy_pages_check != nr_copy_pages);
 	BUG_ON (pagedir_order_check != pagedir_order);
 
+	__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);
-	__flush_tlb_global();		/* Even mappings of "global" things (vmalloc) need to be fixed */
 	drivers_resume(RESUME_ALL_PHASES);
 	spin_unlock_irq(&suspend_pagedir_lock);
 
@@ -809,12 +823,10 @@
 
 	barrier();
 	mb();
-	drivers_resume(RESUME_PHASE2);
 	spin_lock_irq(&suspend_pagedir_lock);	/* Done to disable interrupts */ 
 	mdelay(1000);
 
 	free_pages((unsigned long) pagedir_nosave, pagedir_order);
-	drivers_resume(RESUME_PHASE1);
 	spin_unlock_irq(&suspend_pagedir_lock);
 	mark_swapfiles(((swp_entry_t) {0}), MARK_SWAP_RESUME);
 	PRINTK(KERN_WARNING "%sLeaving do_magic_suspend_2...\n", name_suspend);	
@@ -1037,6 +1049,7 @@
 	return 0;
 #endif
 	printk(KERN_CRIT "%sWarning %s: Fixing swap signatures unimplemented...\n", name_resume, resume_file);
+	return 0;
 }
 
 extern kdev_t __init name_to_kdev_t(const char *line);

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Re: Swsusp updates, do not thrash ide disk on suspend

[Linus Torvalds]

On Wed, 2 Oct 2002, Pavel Machek wrote:
> 
> This cleans up swsusp a little bit and fixes ide disk corruption on
> suspend/resume. Please apply,

It also seems to be doing things with the device manager. Mind explaining 
those changes too?

		Linus

Re: Swsusp updates, do not thrash ide disk on suspend

[Pavel Machek]

Hi!

> > This cleans up swsusp a little bit and fixes ide disk corruption on
> > suspend/resume. Please apply,
> 
> It also seems to be doing things with the device manager. Mind explaining 
> those changes too?

Those are forward port of what we had there already. I make IDE child
of PCI device with the controller (in cases its on PCI). That seems
logical place for it and we had it like that in 2.5.30 or
so. ide-disk.c is there to make disk sleep before we go
suspend. Without that, data corruption happens.
									Pavel
-- 
Casualities in World Trade Center: ~3k dead inside the building,
cryptography in U.S.A. and free speech in Czech Republic.

Re: Swsusp updates, do not thrash ide disk on suspend

[Andre Hedrick]

On Wed, 2 Oct 2002, Pavel Machek wrote:

> Hi!
> 
> > > This cleans up swsusp a little bit and fixes ide disk corruption on
> > > suspend/resume. Please apply,
> > 
> > It also seems to be doing things with the device manager. Mind explaining 
> > those changes too?
> 
> Those are forward port of what we had there already. I make IDE child
> of PCI device with the controller (in cases its on PCI). That seems
> logical place for it and we had it like that in 2.5.30 or
> so. ide-disk.c is there to make disk sleep before we go
> suspend. Without that, data corruption happens.

Pavel,

I pointed out to you various other device other than disk support DMA, and
moving the suspend point up to the mainloop away from the subdrivers.
This would insure the entire sub-system is out.  Why are we block after
the request has been sent to the sub-driver?  Why do you see this the
preferred location and not before it enters the system?  Given that you
have stated it does not parse the difference between S3 v/s S4, I am
graveful concerned.  However, if this is how you and Linus have decide to
impliment this project, I shall attempt to sustain interoperablity.

Sigh ...

Andre Hedrick
LAD Storage Consulting Group

Re: Swsusp updates, do not thrash ide disk on suspend

[Adrian Bunk]

On Wed, 2 Oct 2002, Pavel Machek wrote:

>...
> --- clean/Documentation/swsusp.txt	2002-07-09 04:54:06.000000000 +0200
> +++ linux-swsusp/Documentation/swsusp.txt	2002-09-25 21:14:42.000000000 +0200
> @@ -156,6 +156,23 @@
>  - do IDE cdroms need some kind of support?
>  - IDE CD-RW -- how to deal with that?
>
> +FAQ:
> +
> +Q: well, suspending a server is IMHO a really stupid thing,
> +but... (Diego Zuccato):
>...
> +Ethernet card in your server died. You want to replace it. Your
> +server is not hotplug capable. What do you do? Suspend to disk,
> +replace ethernet card, resume. If you are fast your users will not
> +even see broken connections.
>...

This sounds as if it might makes even ISA cards hot-pluggable with the
implication that the drivers might need __devinit/__devexit etc.?

cu
Adrian

-- 

You only think this is a free country. Like the US the UK spends a lot of
time explaining its a free country because its a police state.
								Alan Cox

Re: Swsusp updates, do not thrash ide disk on suspend

[Pavel Machek]

Hi!

> > --- clean/Documentation/swsusp.txt	2002-07-09 04:54:06.000000000 +0200
> > +++ linux-swsusp/Documentation/swsusp.txt	2002-09-25 21:14:42.000000000 +0200
> > @@ -156,6 +156,23 @@
> >  - do IDE cdroms need some kind of support?
> >  - IDE CD-RW -- how to deal with that?
> >
> > +FAQ:
> > +
> > +Q: well, suspending a server is IMHO a really stupid thing,
> > +but... (Diego Zuccato):
> >...
> > +Ethernet card in your server died. You want to replace it. Your
> > +server is not hotplug capable. What do you do? Suspend to disk,
> > +replace ethernet card, resume. If you are fast your users will not
> > +even see broken connections.
> >...
> 
> This sounds as if it might makes even ISA cards hot-pluggable with the
> implication that the drivers might need __devinit/__devexit etc.?

Yes. I'm just not sure if it is worth the effort.
								Pavel
-- 
Casualities in World Trade Center: ~3k dead inside the building,
cryptography in U.S.A. and free speech in Czech Republic.

Re: Swsusp updates, do not thrash ide disk on suspend

[Pavel Machek]

Hi!

> > > > This cleans up swsusp a little bit and fixes ide disk corruption on
> > > > suspend/resume. Please apply,
> > > 
> > > It also seems to be doing things with the device manager. Mind explaining 
> > > those changes too?
> > 
> > Those are forward port of what we had there already. I make IDE child
> > of PCI device with the controller (in cases its on PCI). That seems
> > logical place for it and we had it like that in 2.5.30 or
> > so. ide-disk.c is there to make disk sleep before we go
> > suspend. Without that, data corruption happens.
> 
> I pointed out to you various other device other than disk support
> DMA, and

Well, if even this patch is hard to push through, how hard would it be
to push patch that touches also cdroms etc?

> moving the suspend point up to the mainloop away from the
> subdrivers.

Are you trying to say that you believe that idedisk_suspend could be
same as idecdrom_suspend and idefloppy_suspend?

> This would insure the entire sub-system is out.  Why are we block
             ~~~~~~ do you mean ensure?
> after
> the request has been sent to the sub-driver?  

We are not block. Certainly *I* am not block ;-). Do you mean "why do
we block"? Which "block" do you have in mind?

> Why do you see this the
> preferred location and not before it enters the system?  Given that you
> have stated it does not parse the difference between S3 v/s S4, I am
> graveful concerned.  

What problem do you have with no difference between S3 and S4?
								Pavel
-- 
Casualities in World Trade Center: ~3k dead inside the building,
cryptography in U.S.A. and free speech in Czech Republic.

Re: Swsusp updates, do not thrash ide disk on suspend

[Alan Cox]

On Wed, 2002-10-02 at 12:49, Adrian Bunk wrote:
> This sounds as if it might makes even ISA cards hot-pluggable with the
> implication that the drivers might need __devinit/__devexit etc.?

This is already true anyway. My IBM thinkpad docking station effectively
has hot pluggable ISA