From: Joerg Roedel <joro-zLv9SwRftAIdnm+yROfE0A@public.gmane.org>
To: Thierry Reding <thierry.reding-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
Cc: Tomasz Figa <tfiga-F7+t8E8rja9g9hUCZPvPmw@public.gmane.org>,
iommu-cunTk1MwBs9QetFLy7KEm3xJsTq8ys+cHZ5vskTnxNA@public.gmane.org,
Hiroshi Doyu <hdoyu-DDmLM1+adcrQT0dZR+AlfA@public.gmane.org>,
Stephen Warren <swarren-3lzwWm7+Weoh9ZMKESR00Q@public.gmane.org>,
Alexandre Courbot
<gnurou-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>,
Vince Hsu <vince.h-DDmLM1+adcrQT0dZR+AlfA@public.gmane.org>,
Russell King <rmk+kernel-lFZ/pmaqli7XmaaqVzeoHQ@public.gmane.org>,
Paul Walmsley <paul-DWxLp4Yu+b8AvxtiuMwx3w@public.gmane.org>,
Tomeu Vizoso
<tomeu.vizoso-ZGY8ohtN/8qB+jHODAdFcQ@public.gmane.org>,
Mikko Perttunen
<mperttunen-DDmLM1+adcrQT0dZR+AlfA@public.gmane.org>,
Will Deacon <will.deacon-5wv7dgnIgG8@public.gmane.org>,
Alex Williamson
<alex.williamson-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>,
Arnd Bergmann <arnd-r2nGTMty4D4@public.gmane.org>,
Marek Szyprowski
<m.szyprowski-Sze3O3UU22JBDgjK7y7TUQ@public.gmane.org>,
Antonios Motakis
<a.motakis-lrHrjnjw1UfHK3s98zE1ajGjJy/sRE9J@public.gmane.org>,
Olav Haugan <ohaugan-sgV2jX0FEOL9JmXXK+q4OQ@public.gmane.org>,
Nicolas Iooss <nicolas.iooss_linux-oWGTIYur0i8@public.gmane.org>,
linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
linux-tegra-u79uwXL29TY76Z2rM5mHXA@public.gmane.org
Subject: Re: [RFC PATCH 0/3] iommu: Add range flush operation
Date: Tue, 29 Sep 2015 14:22:32 +0200 [thread overview]
Message-ID: <20150929122232.GH3036@8bytes.org> (raw)
In-Reply-To: <20150929092714.GD9460-AwZRO8vwLAwmlAP/+Wk3EA@public.gmane.org>
On Tue, Sep 29, 2015 at 11:27:14AM +0200, Thierry Reding wrote:
> On Tue, Sep 29, 2015 at 02:25:23PM +0900, Tomasz Figa wrote:
> > 3) possibility of exporting the iommu_flush() operation and providing
> > unsynchronized map/unmap operations for subsystems with even higher
> > requirements for performance (e.g. drivers/gpu/drm).
>
> That would require passing in some sort of flag that the core shouldn't
> be flushing itself, right? Currently it would flush on every map/unmap.
Not necessarily. Introducing a flag would require updating all callers,
so while at it we could also just change the semantics of map/unmap to
require an explicit flush afterwards (only if it turns out that such an
iommu_flush() function is really needed).
Joerg
WARNING: multiple messages have this Message-ID (diff)
From: Joerg Roedel <joro@8bytes.org>
To: Thierry Reding <thierry.reding@gmail.com>
Cc: Tomasz Figa <tfiga@chromium.org>,
iommu@lists.linux-foundation.org, Hiroshi Doyu <hdoyu@nvidia.com>,
Stephen Warren <swarren@wwwdotorg.org>,
Alexandre Courbot <gnurou@gmail.com>,
Vince Hsu <vince.h@nvidia.com>,
Russell King <rmk+kernel@arm.linux.org.uk>,
Paul Walmsley <paul@pwsan.com>,
Tomeu Vizoso <tomeu.vizoso@collabora.com>,
Mikko Perttunen <mperttunen@nvidia.com>,
Will Deacon <will.deacon@arm.com>,
Alex Williamson <alex.williamson@redhat.com>,
Arnd Bergmann <arnd@arndb.de>,
Marek Szyprowski <m.szyprowski@samsung.com>,
Antonios Motakis <a.motakis@virtualopensystems.com>,
Olav Haugan <ohaugan@codeaurora.org>,
Nicolas Iooss <nicolas.iooss_linux@m4x.org>,
linux-kernel@vger.kernel.org, linux-tegra@vger.kernel.org
Subject: Re: [RFC PATCH 0/3] iommu: Add range flush operation
Date: Tue, 29 Sep 2015 14:22:32 +0200 [thread overview]
Message-ID: <20150929122232.GH3036@8bytes.org> (raw)
In-Reply-To: <20150929092714.GD9460@ulmo.nvidia.com>
On Tue, Sep 29, 2015 at 11:27:14AM +0200, Thierry Reding wrote:
> On Tue, Sep 29, 2015 at 02:25:23PM +0900, Tomasz Figa wrote:
> > 3) possibility of exporting the iommu_flush() operation and providing
> > unsynchronized map/unmap operations for subsystems with even higher
> > requirements for performance (e.g. drivers/gpu/drm).
>
> That would require passing in some sort of flag that the core shouldn't
> be flushing itself, right? Currently it would flush on every map/unmap.
Not necessarily. Introducing a flag would require updating all callers,
so while at it we could also just change the semantics of map/unmap to
require an explicit flush afterwards (only if it turns out that such an
iommu_flush() function is really needed).
Joerg
next prev parent reply other threads:[~2015-09-29 12:22 UTC|newest]
Thread overview: 34+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-09-29 5:25 [RFC PATCH 0/3] iommu: Add range flush operation Tomasz Figa
2015-09-29 5:25 ` Tomasz Figa
[not found] ` <1443504379-31841-1-git-send-email-tfiga-F7+t8E8rja9g9hUCZPvPmw@public.gmane.org>
2015-09-29 5:25 ` [RFC PATCH 1/3] iommu: Add support for out of band flushing Tomasz Figa
2015-09-29 5:25 ` Tomasz Figa
[not found] ` <1443504379-31841-2-git-send-email-tfiga-F7+t8E8rja9g9hUCZPvPmw@public.gmane.org>
2015-09-29 9:32 ` Thierry Reding
2015-09-29 9:32 ` Thierry Reding
[not found] ` <20150929093257.GE9460-AwZRO8vwLAwmlAP/+Wk3EA@public.gmane.org>
2015-09-29 11:56 ` Tomasz Figa
2015-09-29 11:56 ` Tomasz Figa
2015-09-29 5:25 ` [RFC PATCH 2/3] memory: tegra: add TLB cache line size Tomasz Figa
2015-09-29 5:25 ` Tomasz Figa
[not found] ` <1443504379-31841-3-git-send-email-tfiga-F7+t8E8rja9g9hUCZPvPmw@public.gmane.org>
2015-09-29 9:43 ` Thierry Reding
2015-09-29 9:43 ` Thierry Reding
[not found] ` <20150929094348.GF9460-AwZRO8vwLAwmlAP/+Wk3EA@public.gmane.org>
2015-09-29 12:11 ` Tomasz Figa
2015-09-29 12:11 ` Tomasz Figa
2015-09-29 5:25 ` [RFC PATCH 3/3] iommu/tegra-smmu: Make the driver use out of band flushing Tomasz Figa
2015-09-29 5:25 ` Tomasz Figa
2015-09-29 9:27 ` [RFC PATCH 0/3] iommu: Add range flush operation Thierry Reding
2015-09-29 9:27 ` Thierry Reding
[not found] ` <20150929092714.GD9460-AwZRO8vwLAwmlAP/+Wk3EA@public.gmane.org>
2015-09-29 11:54 ` Tomasz Figa
2015-09-29 11:54 ` Tomasz Figa
2015-09-29 12:22 ` Joerg Roedel [this message]
2015-09-29 12:22 ` Joerg Roedel
2015-09-29 12:20 ` Joerg Roedel
2015-09-29 12:20 ` Joerg Roedel
2015-09-29 14:20 ` Robin Murphy
2015-09-29 14:20 ` Robin Murphy
[not found] ` <560A9E36.9030903-5wv7dgnIgG8@public.gmane.org>
2015-09-29 14:32 ` Russell King - ARM Linux
2015-09-29 14:32 ` Russell King - ARM Linux
[not found] ` <20150929143241.GI21513-l+eeeJia6m9vn6HldHNs0ANdhmdF6hFW@public.gmane.org>
2015-09-29 16:27 ` Robin Murphy
2015-09-29 16:27 ` Robin Murphy
[not found] ` <560ABBE0.8020805-5wv7dgnIgG8@public.gmane.org>
2015-09-29 16:40 ` Russell King - ARM Linux
2015-09-29 16:40 ` Russell King - ARM Linux
[not found] ` <20150929164014.GL21513-l+eeeJia6m9vn6HldHNs0ANdhmdF6hFW@public.gmane.org>
2015-09-29 17:13 ` Robin Murphy
2015-09-29 17:13 ` Robin Murphy
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