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SubjectSwsusp updates, do not thrash ide disk on suspend
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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