From: Joerg Roedel <joro-zLv9SwRftAIdnm+yROfE0A@public.gmane.org>
To: Sohil Mehta <sohil.mehta-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>
Cc: Ravi V Shankar
<ravi.v.shankar-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>,
Ashok Raj <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: Tue, 13 Feb 2018 15:03:03 +0100 [thread overview]
Message-ID: <20180213140303.42mbzfxpypljy37l@8bytes.org> (raw)
In-Reply-To: <1517619001-148586-1-git-send-email-sohil.mehta-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>
On Fri, Feb 02, 2018 at 04:49:56PM -0800, Sohil Mehta wrote:
> This series aims to add debugfs support for Intel IOMMU. It exposes IOMMU
> registers, internal context and dumps individual table entries to help debug
> Intel IOMMUs.
>
> The first patch does the ground work for the following patches by reorganizing
> some Intel IOMMU data structures. The following patches create a new Kconfig
> option - INTEL_IOMMU_DEBUG and add debugfs support for IOMMU context internals,
> register contents, PASID internals, and Interrupt remapping in that order. The
> information can be accessed in sysfs at '/sys/kernel/debug/intel_iommu/'.
This looks like it only presents data from the iommu-hardware (register
state) or from in-memory data structures used by the hardware. Can't all
this be read out from user-space with libpci and /dev/mem access?
Things are different for kernel-defined data structures, as they might
change between releases and can be presented to user-space via debugfs
is needed, but the data structures used by the hardware should be pretty
stable.
Joerg
next prev parent reply other threads:[~2018-02-13 14:03 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 [this message]
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
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
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