All of lore.kernel.org
 help / color / mirror / Atom feed
From: gpiccoli@linux.vnet.ibm.com (Guilherme G. Piccoli)
Subject: Linux AER reporting
Date: Mon, 22 Aug 2016 15:10:33 -0300	[thread overview]
Message-ID: <57BB4019.7050008@linux.vnet.ibm.com> (raw)
In-Reply-To: <CAG3=cOncMTcyALa=-i1jeA-z4pe22D9CrJ=Rxr2E8HWBsEMOPg@mail.gmail.com>

On 08/22/2016 12:52 PM, Nisha Miller wrote:
> Hi all,
>
> We have a PCIE SSD controller using NVME. This controller works on
> Windows and Linux. However, we are seeing a problem under Linux.
>
> In the nvme Linux driver in function nvme_kthread() the CSTS register
> is read once a second to check for controller status failure. In our
> case we see that occasionally this register is read as 0xFFFFFFFF.
> Whenever this happens, the kernel just hangs. This seems to be PCIe
> read error and we are trying to gather further information. How does
> one use Linux AER with the nvme driver?

Nisha, we once saw 0xFFFF on CSTS register after issuing a 
reset_controller, for example. The reason it was that device shutdown 
was replaced by device disable when resetting the controller, following 
the NVMe spec, but the device we were testing that time didn't cope well 
with this change.

For that, we implemented a quirk to wait a little on reading this 
register in some occasions. The commit info is:


54adc01055 ("nvme/quirk: Add a delay before checking for adapter readiness")

https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=54adc01055b75ec8769c5a36574c7a0895c0c0b2


I'm really not sure if it's related, but I guess worth a try.
Cheers,


Guilherme


>
> We are using Centos 7.2 with Kernel 3.19.8. PCIe AER has been enabled
> in the kernel and aerdriver.forceload=y is set in the command line.
>
> TIA
> Nisha Miller
>
> _______________________________________________
> Linux-nvme mailing list
> Linux-nvme at lists.infradead.org
> http://lists.infradead.org/mailman/listinfo/linux-nvme
>

  parent reply	other threads:[~2016-08-22 18:10 UTC|newest]

Thread overview: 11+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2016-08-22 15:52 Linux AER reporting Nisha Miller
2016-08-22 16:15 ` Keith Busch
2016-08-22 18:10 ` Guilherme G. Piccoli [this message]
2016-08-23 23:56   ` Nisha Miller
2016-08-24 14:02     ` Guilherme G. Piccoli
2016-08-24 14:40       ` Keith Busch
2016-08-24 17:13         ` Nisha Miller
2016-08-25 15:06           ` Keith Busch
2016-08-25 17:37             ` Nisha Miller
2016-08-25 17:49               ` Keith Busch
2016-08-25 18:08                 ` Nisha Miller

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=57BB4019.7050008@linux.vnet.ibm.com \
    --to=gpiccoli@linux.vnet.ibm.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 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.