[PATCH] ATA disk spin-down for -current

[Michael Collette]

I was thinking my suspend mode problems on my Thinkpad T23 were behind me here 
on FreeBSD 4.8.  Been going weeks without having a glitch, then just last 
night...

Put my lappy into suspend mode.  Unplugged my cabling to take it into the 
other room to read some PDF's I had just downloaded.  Opened the lid, and it 
glitched on me.  I should note that I was going from being plugged in to 
operating on battery.

I never do see anything in any of the logs.  When it glitches I see my KDE 
desktop for about 30 seconds totally frozen.  Then this thing just does a 
hard reboot on its own.  Tons of fsck fun on the following boot.

Unfortunately this is extremely difficult to reproduce.  I don't know what 
kind of impact your patch will have on 5-CURRENT, but it would appear that 
under 4-STABLE there is still a problem here.

Later on,

Cliff L. Biffle wrote:
> Allo all.  I've ported the 4.x patch that enabled ATA disk spin-down to
> the
> 5.x kernel.  (It looks like it'd also work on recent 4.x.)  Since I got
> the original patch out of this list's archives, I thought I'd send it
> back.
> 
> Basically this just updates the ata_command calls to the new LBA format
> rather than the older C/H/S.
> 
> I'm relatively unfamiliar with the ATA subsystem, and I -think- putting
> the
> suspend call after ATA_UNLOCK_CH is correct.  If anyone knows better, let
> me know.
> 
> Anyway, I've been using this on my laptop with great success.  Suspend
> time is set (in seconds) in hw.ata.suspend; this must be done at boot in
> loader.conf, as it's read-only at runtime.
> 
> Comments?  Corrections?
> 
> -Cliff L. Biffle
> 
> --- src/sys/dev/ata/ata-disk.c.orig	Fri Apr 11 12:50:37 2003
> +++ src/sys/dev/ata/ata-disk.c	Fri Apr 11 13:05:54 2003
> @@ -70,9 +70,11 @@
>  static int ata_dma = 1;
>  static int ata_wc = 1;
>  static int ata_tags = 0;
> +static int ata_suspend = 0;
>  TUNABLE_INT("hw.ata.ata_dma", &ata_dma);
>  TUNABLE_INT("hw.ata.wc", &ata_wc);
>  TUNABLE_INT("hw.ata.tags", &ata_tags);
> +TUNABLE_INT("hw.ata.suspend", &ata_suspend);
>  static MALLOC_DEFINE(M_AD, "AD driver", "ATA disk driver");
>  
>  /* sysctl vars */
> @@ -83,6 +85,8 @@
>  "ATA disk write caching");
>  SYSCTL_INT(_hw_ata, OID_AUTO, tags, CTLFLAG_RD, &ata_tags, 0,
>  "ATA disk tagged queuing support");
> +SYSCTL_INT(_hw_ata, OID_AUTO, suspend, CTLFLAG_RD, &ata_suspend, 0,
> +	   "ATA disk suspend timer");
>  
>  void
>  ad_attach(struct ata_device *atadev)
> @@ -185,6 +189,12 @@
>  #endif
>      ATA_UNLOCK_CH(atadev->channel);
>  
> +	 if(ata_suspend > 0) {
> +		 /* attempt suspend mode.  The drive uses increments of ten seconds */
> +		 if(ata_command(atadev, 0xe2, 0, ata_suspend/10, 0, ATA_WAIT_INTR))
> +			 ata_prtdev(atadev, "suspend mode failed.");
> +	 }
> +
>      adp->disk.d_open = adopen;
>      adp->disk.d_close = adclose;
>      adp->disk.d_strategy = adstrategy;
> @@ -856,6 +866,11 @@
>      ata_command(atadev, ATA_C_SET_MULTI, 0,
>  adp->transfersize / DEV_BSIZE, 0, ATA_WAIT_READY);
>      atadev->setmode(atadev, adp->device->mode);
> +	 if(ata_suspend > 0) {
> +		 /* attempt suspend mode.  The drive uses increments of ten seconds */
> +		 if(ata_command(atadev, 0xe2, 0, ata_suspend/10, 0, ATA_WAIT_READY))
> +			 ata_prtdev(atadev, "suspend mode failed.");
> +	 }
>  }
>  
>  void
> 
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-- 
"Outside of a dog, a book is man's best friend. Inside of a dog, it's too dark 
to read."
 - Groucho Marx