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SubjectRe: [RFT][PATCH] ide-disk.c: more write cache fixes
Bartlomiej Zolnierkiewicz wrote:

>>Bart, could something like:
>>
>>if (system_state == SYSTEM_RESTART) {
>> ide_cache_flush_p(drive)
>> return;
>>}
>>
>>(as opposed to just the return in that patch and -mm3) possibly help? I
>
> Yep, this may fix it.

Oh, wonderful. Alan, first attachment is a new version of the rollup
with this incorporated (ie, again versus 2.6.6 vanilla).

Andrew, second attachment is for you. Guess it's largely a "can't hurt",
but please wait for Alan to ack. If that drive is really screwy, this
still won't do.

Rene.
diff -urN linux-2.6.6.orig/drivers/ide/ide-disk.c linux-2.6.6/drivers/ide/ide-disk.c
--- linux-2.6.6.orig/drivers/ide/ide-disk.c 2004-05-10 09:31:44.000000000 +0200
+++ linux-2.6.6/drivers/ide/ide-disk.c 2004-05-16 23:38:55.000000000 +0200
@@ -740,8 +740,6 @@
return __ide_do_rw_disk(drive, rq, block);
}

-static int do_idedisk_flushcache(ide_drive_t *drive);
-
static u8 idedisk_dump_status (ide_drive_t *drive, const char *msg, u8 stat)
{
ide_hwif_t *hwif = HWIF(drive);
@@ -1359,11 +1357,18 @@
return 0;
}

+/* check if CACHE FLUSH (EXT) command is supported (bits defined in ATA-6) */
+#define ide_id_has_flush_cache(id) ((id)->cfs_enable_2 & 0x3000)
+
+/* some Maxtor disks have bit 13 defined incorrectly so check bit 10 too */
+#define ide_id_has_flush_cache_ext(id) \
+ (((id)->cfs_enable_2 & 0x2400) == 0x2400)
+
static int write_cache (ide_drive_t *drive, int arg)
{
ide_task_t args;

- if (!(drive->id->cfs_enable_2 & 0x3000))
+ if (!ide_id_has_flush_cache(drive->id))
return 1;

memset(&args, 0, sizeof(ide_task_t));
@@ -1383,7 +1388,7 @@
ide_task_t args;

memset(&args, 0, sizeof(ide_task_t));
- if (drive->id->cfs_enable_2 & 0x2400)
+ if (ide_id_has_flush_cache_ext(drive->id))
args.tfRegister[IDE_COMMAND_OFFSET] = WIN_FLUSH_CACHE_EXT;
else
args.tfRegister[IDE_COMMAND_OFFSET] = WIN_FLUSH_CACHE;
@@ -1513,11 +1518,11 @@
switch (rq->pm->pm_step) {
case idedisk_pm_flush_cache: /* Suspend step 1 (flush cache) */
/* Not supported? Switch to next step now. */
- if (!drive->wcache) {
+ if (!drive->wcache || !ide_id_has_flush_cache(drive->id)) {
idedisk_complete_power_step(drive, rq, 0, 0);
return ide_stopped;
}
- if (drive->id->cfs_enable_2 & 0x2400)
+ if (ide_id_has_flush_cache_ext(drive->id))
args->tfRegister[IDE_COMMAND_OFFSET] = WIN_FLUSH_CACHE_EXT;
else
args->tfRegister[IDE_COMMAND_OFFSET] = WIN_FLUSH_CACHE;
@@ -1678,8 +1683,12 @@
#endif /* CONFIG_IDEDISK_MULTI_MODE */
}
drive->no_io_32bit = id->dword_io ? 1 : 0;
- if (drive->id->cfs_enable_2 & 0x3000)
- write_cache(drive, (id->cfs_enable_2 & 0x3000));
+
+ /* write cache enabled? */
+ if ((id->csfo & 1) || (id->cfs_enable_1 & (1 << 5)))
+ drive->wcache = 1;
+
+ write_cache(drive, 1);

#ifdef CONFIG_BLK_DEV_IDE_TCQ_DEFAULT
if (drive->using_dma)
@@ -1687,9 +1696,17 @@
#endif
}

+static void ide_cacheflush_p(ide_drive_t *drive)
+{
+ if (!drive->wcache || !ide_id_has_flush_cache(drive->id))
+ return;
+
+ if (do_idedisk_flushcache(drive))
+ printk(KERN_INFO "%s: wcache flush failed!\n", drive->name);
+}
+
static int idedisk_cleanup (ide_drive_t *drive)
{
- static int ide_cacheflush_p(ide_drive_t *drive);
struct gendisk *g = drive->disk;
ide_cacheflush_p(drive);
if (ide_unregister_subdriver(drive))
@@ -1706,6 +1723,11 @@
{
ide_drive_t *drive = container_of(dev, ide_drive_t, gendev);

+ if (system_state == SYSTEM_RESTART) {
+ ide_cacheflush_p(drive);
+ return;
+ }
+
printk("Shutdown: %s\n", drive->name);
dev->bus->suspend(dev, PM_SUSPEND_STANDBY);
}
@@ -1740,7 +1762,6 @@

static int idedisk_open(struct inode *inode, struct file *filp)
{
- u8 cf;
ide_drive_t *drive = inode->i_bdev->bd_disk->private_data;
drive->usage++;
if (drive->removable && drive->usage == 1) {
@@ -1758,35 +1779,6 @@
if (drive->doorlocking && ide_raw_taskfile(drive, &args, NULL))
drive->doorlocking = 0;
}
- drive->wcache = 0;
- /* Cache enabled? */
- if (drive->id->csfo & 1)
- drive->wcache = 1;
- /* Cache command set available? */
- if (drive->id->cfs_enable_1 & (1 << 5))
- drive->wcache = 1;
- /* ATA6 cache extended commands */
- cf = drive->id->command_set_2 >> 24;
- if ((cf & 0xC0) == 0x40 && (cf & 0x30) != 0)
- drive->wcache = 1;
- return 0;
-}
-
-static int ide_cacheflush_p(ide_drive_t *drive)
-{
- if (!(drive->id->cfs_enable_2 & 0x3000))
- return 0;
-
- if(drive->wcache)
- {
- if (do_idedisk_flushcache(drive))
- {
- printk (KERN_INFO "%s: Write Cache FAILED Flushing!\n",
- drive->name);
- return -EIO;
- }
- return 1;
- }
return 0;
}

@@ -1867,10 +1859,7 @@
if ((!drive->head || drive->head > 16) && !drive->select.b.lba) {
printk(KERN_ERR "%s: INVALID GEOMETRY: %d PHYSICAL HEADS?\n",
drive->name, drive->head);
- if ((drive->id->cfs_enable_2 & 0x3000) && drive->wcache)
- if (do_idedisk_flushcache(drive))
- printk (KERN_INFO "%s: Write Cache FAILED Flushing!\n",
- drive->name);
+ ide_cacheflush_p(drive);
ide_unregister_subdriver(drive);
DRIVER(drive)->busy--;
goto failed;
diff -urN linux-2.6.6.orig/include/linux/kernel.h linux-2.6.6/include/linux/kernel.h
--- linux-2.6.6.orig/include/linux/kernel.h 2004-05-10 09:31:47.000000000 +0200
+++ linux-2.6.6/include/linux/kernel.h 2004-05-16 23:35:26.000000000 +0200
@@ -109,14 +109,17 @@
extern void bust_spinlocks(int yes);
extern int oops_in_progress; /* If set, an oops, panic(), BUG() or die() is in progress */
extern int panic_on_oops;
-extern int system_state; /* See values below */
extern int tainted;
extern const char *print_tainted(void);

/* Values used for system_state */
-#define SYSTEM_BOOTING 0
-#define SYSTEM_RUNNING 1
-#define SYSTEM_SHUTDOWN 2
+extern enum system_states {
+ SYSTEM_BOOTING,
+ SYSTEM_RUNNING,
+ SYSTEM_HALT,
+ SYSTEM_POWER_OFF,
+ SYSTEM_RESTART,
+} system_state;

#define TAINT_PROPRIETARY_MODULE (1<<0)
#define TAINT_FORCED_MODULE (1<<1)
diff -urN linux-2.6.6.orig/init/main.c linux-2.6.6/init/main.c
--- linux-2.6.6.orig/init/main.c 2004-05-10 09:31:47.000000000 +0200
+++ linux-2.6.6/init/main.c 2004-05-16 23:35:26.000000000 +0200
@@ -95,7 +95,8 @@
extern void tc_init(void);
#endif

-int system_state; /* SYSTEM_BOOTING/RUNNING/SHUTDOWN */
+enum system_states system_state;
+EXPORT_SYMBOL(system_state);

/*
* Boot command-line arguments
diff -urN linux-2.6.6.orig/kernel/sys.c linux-2.6.6/kernel/sys.c
--- linux-2.6.6.orig/kernel/sys.c 2004-05-10 09:31:47.000000000 +0200
+++ linux-2.6.6/kernel/sys.c 2004-05-16 23:35:26.000000000 +0200
@@ -447,7 +447,7 @@
switch (cmd) {
case LINUX_REBOOT_CMD_RESTART:
notifier_call_chain(&reboot_notifier_list, SYS_RESTART, NULL);
- system_state = SYSTEM_SHUTDOWN;
+ system_state = SYSTEM_RESTART;
device_shutdown();
printk(KERN_EMERG "Restarting system.\n");
machine_restart(NULL);
@@ -463,7 +463,7 @@

case LINUX_REBOOT_CMD_HALT:
notifier_call_chain(&reboot_notifier_list, SYS_HALT, NULL);
- system_state = SYSTEM_SHUTDOWN;
+ system_state = SYSTEM_HALT;
device_shutdown();
printk(KERN_EMERG "System halted.\n");
machine_halt();
@@ -473,7 +473,7 @@

case LINUX_REBOOT_CMD_POWER_OFF:
notifier_call_chain(&reboot_notifier_list, SYS_POWER_OFF, NULL);
- system_state = SYSTEM_SHUTDOWN;
+ system_state = SYSTEM_POWER_OFF;
device_shutdown();
printk(KERN_EMERG "Power down.\n");
machine_power_off();
@@ -489,7 +489,7 @@
buffer[sizeof(buffer) - 1] = '\0';

notifier_call_chain(&reboot_notifier_list, SYS_RESTART, buffer);
- system_state = SYSTEM_SHUTDOWN;
+ system_state = SYSTEM_RESTART;
device_shutdown();
printk(KERN_EMERG "Restarting system with command '%s'.\n", buffer);
machine_restart(buffer);--- linux-2.6.6-mm3/drivers/ide/ide-disk.c.orig 2004-05-16 23:43:15.000000000 +0200
+++ linux-2.6.6-mm3/drivers/ide/ide-disk.c 2004-05-16 23:44:51.000000000 +0200
@@ -1723,8 +1723,10 @@
{
ide_drive_t *drive = container_of(dev, ide_drive_t, gendev);

- if (system_state == SYSTEM_RESTART)
+ if (system_state == SYSTEM_RESTART) {
+ ide_cacheflush_p(drive);
return;
+ }

printk("Shutdown: %s\n", drive->name);
dev->bus->suspend(dev, PM_SUSPEND_STANDBY);
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