All of lore.kernel.org
 help / color / mirror / Atom feed
From: Jeff Johnson <jeff.johnson@aeoncomputing.com>
To: linux-scsi@vger.kernel.org
Subject: Is it possible to issue device reset to PMC PM8388 expander using sg3_utils or smp_utils?
Date: Thu, 09 Dec 2010 10:41:00 -0800	[thread overview]
Message-ID: <4D0122BC.8060501@aeoncomputing.com> (raw)

Greetings,

Is it possible to issue a low level device reset to a PMC-Sierra PM8388 
24x3G SAS expander using either sg3_utils or smp_utils?

I am able to enumerate and read the status of the phys on the PM8388, 
read end device information, etc. I tried sg_reset and it does a bus 
reset but not an expander reset.

Technical documentation on the PM8388 is not readily available so I do 
not know if it has a mode select bit or other special method to get the 
expander to reset itself.

I am looking for an inband method to reset the expander to clear a 
condition where some phys in a wide connection fail to link. A power 
cycle clears the condition and I am looking to mimic a power cycle by 
bouncing the expander at the lowest level possible via the SAS host 
connection.

Thank you.

--Jeff

             reply	other threads:[~2010-12-09 18:41 UTC|newest]

Thread overview: 4+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2010-12-09 18:41 Jeff Johnson [this message]
2010-12-09 18:59 ` Is it possible to issue device reset to PMC PM8388 expander using sg3_utils or smp_utils? James Bottomley
2010-12-09 19:05   ` Jeff Johnson
2010-12-09 20:53     ` Douglas Gilbert

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=4D0122BC.8060501@aeoncomputing.com \
    --to=jeff.johnson@aeoncomputing.com \
    --cc=linux-scsi@vger.kernel.org \
    /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 an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.