From: Jeff Garzik <jeff@garzik.org>
To: Richard Crewe <rcrewe@plxtech.com>
Cc: linux-ide@vger.kernel.org, Shane Huang <Shane.Huang@amd.com>
Subject: Re: Soft-reset on a FIS-Based-Switching AHCI interface
Date: Wed, 14 Sep 2011 01:04:32 -0400 [thread overview]
Message-ID: <4E7035E0.3000408@garzik.org> (raw)
In-Reply-To: <4E6E1105.6060103@plxtech.com>
On 09/12/2011 10:02 AM, Richard Crewe wrote:
> The AHCI spec. seems to indicate that a soft-reset can only be performed
> if FBS is disabled.
Can you cite section numbers / specific references for this?
> Looking at the LibATA and LibAHCI code at the moment, I can't see where
> this is done. The soft-reset happens during error recovery when the port
> re-enumerates devices.
>
> Am I missing something or is this a _relatively_ less-well tested area
> of the LibATA/AHCI operation?
I cannot see where FBS is disabled for soft-reset, either.
FBS is pretty new, hasn't changed much at all since its initial
implementation on an AMD reference board, and is (obviously) only used
with PMPs. FBS is a pretty small subset of the total AHCI population,
so I doubt the code is exercised heavily except for a very few, large
storage installations.
Jeff
prev parent reply other threads:[~2011-09-14 5:12 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-09-12 14:02 Soft-reset on a FIS-Based-Switching AHCI interface Richard Crewe
2011-09-14 5:04 ` Jeff Garzik [this message]
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=4E7035E0.3000408@garzik.org \
--to=jeff@garzik.org \
--cc=Shane.Huang@amd.com \
--cc=linux-ide@vger.kernel.org \
--cc=rcrewe@plxtech.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).