linux-kernel - No NCQ support on X61s Ultrabay? (Intel ICH8 SATA controller question)

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Date:	Wed, 29 Apr 2009 22:07:14 -0400
From:	"Theodore Ts'o" <tytso@....edu>
To:	linux-kernel@...r.kernel.org
cc:	Matthew Wilcox <willy@...ux.intel.com>
Subject: No NCQ support on X61s Ultrabay?  (Intel ICH8 SATA controller question)

I was taking a look at why I can't get NCQ working on the Ultrabay drive
on the X61s Thinkpad (which is a big deal if you're using the X25-M
SSD):

[ 4563.614247] ata4.00: 390721968 sectors, multi 16: LBA48 NCQ (depth 0/32)
                                                                ^^^^^^^

which as near as I can tell is because ATA_FLAG_NCQ isn't set in struct
ata_port->flag.  This looks like it should be set to ata_piix.c if the
controller supports NCQ --- but ata_piix.c doesn't set ATA_FLAG_NCQ at
all.  However, this web page:

	http://www.intel.com/support/chipsets/imst/sb/CS-012304.htm

Seems to imply the 82801HBM/HEM SATA controller from the ICH8M/ICHM8-E
supports AHCI and NCQ, and this is the controller which is in the X61s
laptop.

So I wonder if it's safe to simply add ATA_FLAG_NCQ to ata_piix.c or
not?  Can someone who's more familiar with Intel's ICH8 SATA controller
comment on whether this would be a safe thing to do?

Thanks,

						- Ted
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