From: Jacob Pan <jacob.jun.pan-VuQAYsv1563Yd54FQh9/CA@public.gmane.org>
To: Joerg Roedel <joro-zLv9SwRftAIdnm+yROfE0A@public.gmane.org>
Cc: Ravi V Shankar
<ravi.v.shankar-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>,
"Raj, Ashok" <ashok.raj-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>,
Fenghua Yu <fenghua.yu-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>,
iommu-cunTk1MwBs9QetFLy7KEm3xJsTq8ys+cHZ5vskTnxNA@public.gmane.org,
linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
Andy Shevchenko
<andriy.shevchenko-VuQAYsv1563Yd54FQh9/CA@public.gmane.org>,
David Woodhouse <dwmw2-wEGCiKHe2LqWVfeAwA7xHQ@public.gmane.org>,
Gayatri Kammela
<gayatri.kammela-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>
Subject: Re: [PATCH v7 0/5] Add Intel IOMMU debugfs support
Date: Thu, 15 Feb 2018 08:38:11 -0800 [thread overview]
Message-ID: <20180215083811.3ec86e49@jacob-builder> (raw)
In-Reply-To: <20180215095337.fccoozdclfnbepi4-zLv9SwRftAIdnm+yROfE0A@public.gmane.org>
On Thu, 15 Feb 2018 10:53:38 +0100
Joerg Roedel <joro-zLv9SwRftAIdnm+yROfE0A@public.gmane.org> wrote:
> On Tue, Feb 13, 2018 at 02:53:32PM -0800, Jacob Pan wrote:
> > We did start out with /dev/mem but run into CONFIG_STRICT_DEVMEM
> > requirement which is turned on by default.
> > libpci is only limited to PCI config space access, right?
>
> Even if /dev/mem is not an option, I am still not convinced that this
> is a good idea. How should this be used? Will you just use it to debug
> Intel IOMMUs when you guys work on the driver or should users report
> the data back when they hit problems?
>
It is for both but mainly the latter. when we have customers/users
reporting Intel IOMMU issues, it would be extremely helpful if we can
ask them to turn debugfs on and report the state. As we move to SVA, we
may also include io page table similar to /sys/kernel/debug/page_table
for PASID etc.
Just wondering if your concern is on the implementation or the debugfs
idea in general. Perhaps have some common IOMMU debugfs?
next prev parent reply other threads:[~2018-02-15 16:38 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-02-03 0:49 [PATCH v7 0/5] Add Intel IOMMU debugfs support Sohil Mehta
[not found] ` <1517619001-148586-1-git-send-email-sohil.mehta-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>
2018-02-03 0:49 ` [PATCH v7 1/5] iommu/vt-d: Relocate struct/function declarations to its header files Sohil Mehta
2018-02-03 0:49 ` [PATCH v7 2/5] iommu/vt-d: Enable debugfs support to show context internals Sohil Mehta
2018-02-03 0:49 ` [PATCH v7 3/5] iommu/vt-d: Add debugfs support to show register contents Sohil Mehta
2018-02-03 0:50 ` [PATCH v7 4/5] iommu/vt-d: Add debugfs support to show Pasid table contents Sohil Mehta
2018-02-03 0:50 ` [PATCH v7 5/5] iommu/vt-d: Add debugfs support for Interrupt remapping Sohil Mehta
2018-02-04 14:13 ` [PATCH v7 0/5] Add Intel IOMMU debugfs support Andy Shevchenko
2018-02-13 14:03 ` Joerg Roedel
2018-02-13 21:40 ` Raj, Ashok
2018-02-13 22:53 ` Jacob Pan
2018-02-15 9:53 ` Joerg Roedel
[not found] ` <20180215095337.fccoozdclfnbepi4-zLv9SwRftAIdnm+yROfE0A@public.gmane.org>
2018-02-15 16:38 ` Jacob Pan [this message]
2018-03-15 13:18 ` Joerg Roedel
[not found] ` <20180315131854.s6xmltsvsysublcw-zLv9SwRftAIdnm+yROfE0A@public.gmane.org>
2018-03-19 16:37 ` Jacob Pan
2018-03-29 8:48 ` Joerg Roedel
[not found] ` <20180329084824.fvy7cg2wban4by4n-zLv9SwRftAIdnm+yROfE0A@public.gmane.org>
2018-03-29 15:52 ` Gary R Hook
2018-03-29 16:05 ` Jacob Pan
2018-02-18 22:15 ` Yves-Alexis Perez
[not found] ` <1518992132.2542.5.camel-8fiUuRrzOP0dnm+yROfE0A@public.gmane.org>
2018-02-20 22:25 ` Jacob Pan
2018-02-22 7:48 ` Yves-Alexis Perez
[not found] ` <1519285717.2388.11.camel-8fiUuRrzOP0dnm+yROfE0A@public.gmane.org>
2018-02-22 17:09 ` Jacob Pan
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=20180215083811.3ec86e49@jacob-builder \
--to=jacob.jun.pan-vuqaysv1563yd54fqh9/ca@public.gmane.org \
--cc=andriy.shevchenko-VuQAYsv1563Yd54FQh9/CA@public.gmane.org \
--cc=ashok.raj-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org \
--cc=dwmw2-wEGCiKHe2LqWVfeAwA7xHQ@public.gmane.org \
--cc=fenghua.yu-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org \
--cc=gayatri.kammela-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org \
--cc=iommu-cunTk1MwBs9QetFLy7KEm3xJsTq8ys+cHZ5vskTnxNA@public.gmane.org \
--cc=joro-zLv9SwRftAIdnm+yROfE0A@public.gmane.org \
--cc=linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org \
--cc=ravi.v.shankar-ral2JQCrhuEAvxtiuMwx3w@public.gmane.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 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).