linux-kernel - Re: [patch 3/3] Enable Aggressive Link Power management for AHCI controllers.

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:	Tue, 12 Jun 2007 16:56:29 +0100
From:	Matthew Garrett <mjg59@...f.ucam.org>
To:	Tejun Heo <htejun@...il.com>
Cc:	Henrique de Moraes Holschuh <hmh@....eng.br>,
	Arjan van de Ven <arjan@...ux.intel.com>,
	Jeff Garzik <jeff@...zik.org>,
	Dagfinn Ilmari Mannsåker <ilmari@...ari.org>,
	Kristen Carlson Accardi <kristen.c.accardi@...el.com>,
	james.bottomley@...eleye.com, linux-ide@...r.kernel.org,
	linux-scsi@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [patch 3/3] Enable Aggressive Link Power management for AHCI controllers.

On Wed, Jun 13, 2007 at 12:45:21AM +0900, Tejun Heo wrote:
> Matthew Garrett wrote:
> > Yes, but they'll also send an ACPI interrupt even if the SATA host 
> > controller doesn't - it's part of the spec for bays.
> 
> Does the spec mandate that the ACPI interrupt shouldn't depend on SATA
> phy status?  I don't think vendors are likely to implement separate
> mechanism when SATA phy status can do the job fine.

I suspect that the spec allows them to do that, but think that it's 
unlikely to actually happen in most cases. Bear in mind that Windows 
doesn't tend to drive the hardware in AHCI mode, and that their 
implementation is likely to be very similar to the implementation they 
used for PATA devices.

-- 
Matthew Garrett | mjg59@...f.ucam.org
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/