From: Arnd Bergmann <arnd-r2nGTMty4D4@public.gmane.org>
To: Marek Szyprowski <m.szyprowski-Sze3O3UU22JBDgjK7y7TUQ@public.gmane.org>
Cc: 'Thierry Reding'
<thierry.reding-RM9K5IK7kjKj5M59NBduVrNAH6kLmebB@public.gmane.org>,
devicetree-discuss-uLR06cmDAlY/bJ5BZ2RsiQ@public.gmane.org,
'Daniel Vetter' <daniel-/w4YWyX8dFk@public.gmane.org>,
'Joerg Roedel' <joerg.roedel-5C7GfCeVMHo@public.gmane.org>,
dri-devel-PD4FTy7X32lNgt0PjOBp9y5qC8QIuHrW@public.gmane.org,
'Jon Mayo' <jmayo-DDmLM1+adcrQT0dZR+AlfA@public.gmane.org>,
iommu-cunTk1MwBs9QetFLy7KEm3xJsTq8ys+cHZ5vskTnxNA@public.gmane.org,
'Colin Cross' <ccross-z5hGa2qSFaRBDgjK7y7TUQ@public.gmane.org>,
linux-tegra-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
'Hiroshi Doyu' <hdoyu-DDmLM1+adcrQT0dZR+AlfA@public.gmane.org>,
Tomasz Stanislawski
<t.stanislaws-Sze3O3UU22JBDgjK7y7TUQ@public.gmane.org>
Subject: Re: [RFC 4/4] drm: Add NVIDIA Tegra support
Date: Thu, 12 Apr 2012 11:18:19 +0000 [thread overview]
Message-ID: <201204121118.19685.arnd@arndb.de> (raw)
In-Reply-To: <025f01cd1887$da56b6e0$8f0424a0$%szyprowski-Sze3O3UU22JBDgjK7y7TUQ@public.gmane.org>
On Thursday 12 April 2012, Marek Szyprowski wrote:
> Scatter lists were initially designed for the disk based block io operations,
> hence the presence of the in-page offsets and lengths for each chunk. For
> multimedia use cases providing an array of struct pages and asking dma-mapping
> to map them into contiguous memory is probably all we need. I wonder if
> introducing such new calls is a good idea. Anrd, what do think? It will
> definitely simplify the drivers and improve the code understanding. On the
> other hand it requires a significant amount of work in the dma-mapping
> framework for all architectures, but that's not a big issue for me.
My feeling is that it's too much like the existing _sg version, so I wouldn't
add yet another variant. While having a simple page array is definitely
simpler and potentially faster, I think the API is already too complex
and we need to be very careful with new additions.
Arnd
next prev parent reply other threads:[~2012-04-12 11:18 UTC|newest]
Thread overview: 65+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-04-11 12:10 [RFC 0/4] Add NVIDIA Tegra DRM support Thierry Reding
[not found] ` <1334146230-1795-1-git-send-email-thierry.reding-RM9K5IK7kjKj5M59NBduVrNAH6kLmebB@public.gmane.org>
2012-04-11 12:10 ` [RFC 1/4] iommu: tegra/gart: use correct gart_device Thierry Reding
2012-04-11 12:10 ` [RFC 2/4] iommu: tegra/gart: Add device tree support Thierry Reding
[not found] ` <1334146230-1795-3-git-send-email-thierry.reding-RM9K5IK7kjKj5M59NBduVrNAH6kLmebB@public.gmane.org>
2012-04-11 17:21 ` Stephen Warren
[not found] ` <4F85BD9D.7050409-3lzwWm7+Weoh9ZMKESR00Q@public.gmane.org>
2012-04-12 6:51 ` Thierry Reding
2012-04-11 12:10 ` [RFC 3/4] drm: fixed: Add dfixed_frac() macro Thierry Reding
[not found] ` <1334146230-1795-4-git-send-email-thierry.reding-RM9K5IK7kjKj5M59NBduVrNAH6kLmebB@public.gmane.org>
2012-04-11 17:25 ` Stephen Warren
[not found] ` <4F85BE77.7090807-3lzwWm7+Weoh9ZMKESR00Q@public.gmane.org>
2012-04-12 6:52 ` Thierry Reding
2012-04-11 12:10 ` [RFC 4/4] drm: Add NVIDIA Tegra support Thierry Reding
[not found] ` <1334146230-1795-5-git-send-email-thierry.reding-RM9K5IK7kjKj5M59NBduVrNAH6kLmebB@public.gmane.org>
2012-04-11 12:48 ` Daniel Vetter
[not found] ` <20120411124810.GK4296-dv86pmgwkMBes7Z6vYuT8azUEOm+Xw19@public.gmane.org>
2012-04-11 13:23 ` Thierry Reding
[not found] ` <20120411132326.GD27337-RM9K5IK7kjIyiCvfTdI0JKcOhU4Rzj621B7CTYaBSLdn68oJJulU0Q@public.gmane.org>
2012-04-11 13:35 ` Daniel Vetter
[not found] ` <20120411133512.GL4296-dv86pmgwkMBes7Z6vYuT8azUEOm+Xw19@public.gmane.org>
2012-04-11 14:11 ` Thierry Reding
[not found] ` <20120411141108.GI27337-RM9K5IK7kjIyiCvfTdI0JKcOhU4Rzj621B7CTYaBSLdn68oJJulU0Q@public.gmane.org>
2012-04-11 14:34 ` Daniel Vetter
[not found] ` <20120411143456.GM4296-dv86pmgwkMBes7Z6vYuT8azUEOm+Xw19@public.gmane.org>
2012-04-11 14:43 ` Alan Cox
[not found] ` <20120411154309.1f04fb80-38n7/U1jhRXW96NNrWNlrekiAK3p4hvP@public.gmane.org>
2012-04-11 14:49 ` Daniel Vetter
2012-04-11 15:00 ` Thierry Reding
2012-04-11 14:52 ` Alan Cox
[not found] ` <20120411155237.24233afc-38n7/U1jhRXW96NNrWNlrekiAK3p4hvP@public.gmane.org>
2012-04-11 15:06 ` Thierry Reding
[not found] ` <20120411150603.GC20811-RM9K5IK7kjIyiCvfTdI0JKcOhU4Rzj621B7CTYaBSLdn68oJJulU0Q@public.gmane.org>
2012-04-11 15:11 ` Alan Cox
2012-04-11 15:18 ` Arnd Bergmann
[not found] ` <201204111518.41968.arnd-r2nGTMty4D4@public.gmane.org>
2012-04-12 7:18 ` Thierry Reding
[not found] ` <20120412071816.GA18252-RM9K5IK7kjIQXX3q8xo1gnVAuStQJXxyR5q1nwbD4aMs9pC9oP6+/A@public.gmane.org>
2012-04-12 8:40 ` Marek Szyprowski
[not found] ` <025f01cd1887$da56b6e0$8f0424a0$%szyprowski-Sze3O3UU22JBDgjK7y7TUQ@public.gmane.org>
2012-04-12 11:18 ` Arnd Bergmann [this message]
[not found] ` <201204121118.19685.arnd-r2nGTMty4D4@public.gmane.org>
2012-04-12 13:30 ` Marek Szyprowski
[not found] ` <02aa01cd18b0$7b2586a0$717093e0$%szyprowski-Sze3O3UU22JBDgjK7y7TUQ@public.gmane.org>
2012-04-12 13:34 ` Thierry Reding
2012-04-12 14:23 ` Daniel Vetter
2012-04-12 13:42 ` Thierry Reding
[not found] ` <20120412134216.GB15701-RM9K5IK7kjIyiCvfTdI0JKcOhU4Rzj621B7CTYaBSLdn68oJJulU0Q@public.gmane.org>
2012-04-12 14:20 ` Marek Szyprowski
2012-04-12 23:10 ` Lucas Stach
[not found] ` <CAPM=9tztW_xLkOQ1qGjJdaPat_c5ivKPhik5-K8nD58SmF1Qrg@mail.gmail.com>
[not found] ` <1334347952.1625.12.camel@antimon>
2012-04-14 12:51 ` Lucas Stach
2012-04-12 18:56 ` Jon Mayo
2012-04-11 18:12 ` Stephen Warren
[not found] ` <4F85C97E.50203-3lzwWm7+Weoh9ZMKESR00Q@public.gmane.org>
2012-04-12 6:50 ` Thierry Reding
[not found] ` <20120412065038.GB4162-RM9K5IK7kjIyiCvfTdI0JKcOhU4Rzj621B7CTYaBSLdn68oJJulU0Q@public.gmane.org>
2012-04-12 15:49 ` Stephen Warren
[not found] ` <4F86F97C.8010508-3lzwWm7+Weoh9ZMKESR00Q@public.gmane.org>
2012-04-12 17:44 ` Thierry Reding
[not found] ` <20120412174429.GB10042-RM9K5IK7kjIyiCvfTdI0JKcOhU4Rzj621B7CTYaBSLdn68oJJulU0Q@public.gmane.org>
2012-04-12 22:13 ` Stephen Warren
[not found] ` <4F8753A0.6040907-3lzwWm7+Weoh9ZMKESR00Q@public.gmane.org>
2012-04-13 9:14 ` Thierry Reding
[not found] ` <20120413091457.GB617-RM9K5IK7kjIQXX3q8xo1gnVAuStQJXxyR5q1nwbD4aMs9pC9oP6+/A@public.gmane.org>
2012-04-13 19:19 ` Stephen Warren
[not found] ` <4F887C54.6030306-3lzwWm7+Weoh9ZMKESR00Q@public.gmane.org>
2012-04-15 8:39 ` Thierry Reding
[not found] ` <20120415083905.GA15207-RM9K5IK7kjIQXX3q8xo1gnVAuStQJXxyR5q1nwbD4aMs9pC9oP6+/A@public.gmane.org>
2012-04-16 16:00 ` Stephen Warren
[not found] ` <4F8C423B.8050609-3lzwWm7+Weoh9ZMKESR00Q@public.gmane.org>
2012-04-16 18:48 ` Thierry Reding
[not found] ` <20120416184819.GA21043-RM9K5IK7kjIQXX3q8xo1gnVAuStQJXxyR5q1nwbD4aMs9pC9oP6+/A@public.gmane.org>
2012-04-16 18:57 ` Stephen Warren
[not found] ` <4F8C6B80.4000001-3lzwWm7+Weoh9ZMKESR00Q@public.gmane.org>
2012-04-16 19:03 ` Thierry Reding
[not found] ` <20120416190320.GA21233-RM9K5IK7kjIQXX3q8xo1gnVAuStQJXxyR5q1nwbD4aMs9pC9oP6+/A@public.gmane.org>
2012-04-16 20:37 ` Stephen Warren
2012-04-12 9:21 ` Sascha Hauer
[not found] ` <20120412092106.GU3852-bIcnvbaLZ9MEGnE8C9+IrQ@public.gmane.org>
2012-04-12 9:33 ` Thierry Reding
[not found] ` <20120412093301.GB23336-RM9K5IK7kjIQXX3q8xo1gnVAuStQJXxyR5q1nwbD4aMs9pC9oP6+/A@public.gmane.org>
2012-04-12 13:16 ` Alex Deucher
[not found] ` <CADnq5_Oiez8zAHqFw-_qXk=3PnnEqgm3ir9M3KsWaQr-dLS5pw-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2012-04-12 13:25 ` Thierry Reding
[not found] ` <20120412132531.GC5353-RM9K5IK7kjIyiCvfTdI0JKcOhU4Rzj621B7CTYaBSLdn68oJJulU0Q@public.gmane.org>
2012-04-12 14:09 ` Alex Deucher
[not found] ` <CADnq5_P-iGtCxtW+1Y2N34Q6WA5dUUC7ZxZNT29BXTAV0+VfpQ-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2012-04-12 14:12 ` Alex Deucher
[not found] ` <CADnq5_OLaKPLktd8DkQvwrmZPpaQP4zA1a4+742mQCGvRXfD7g-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2012-04-12 16:32 ` Thierry Reding
2012-04-11 12:25 ` [RFC 0/4] Add NVIDIA Tegra DRM support Alan Cox
[not found] ` <20120411132548.7d738b42-38n7/U1jhRXW96NNrWNlrekiAK3p4hvP@public.gmane.org>
2012-04-11 13:35 ` Thierry Reding
2012-04-11 12:46 ` Hiroshi Doyu
[not found] ` <20120411.154642.1389197434468515943.hdoyu-DDmLM1+adcrQT0dZR+AlfA@public.gmane.org>
2012-04-11 13:24 ` Thierry Reding
2012-04-19 17:35 ` Thierry Reding
[not found] ` <20120419173537.GA7692-RM9K5IK7kjIyiCvfTdI0JKcOhU4Rzj621B7CTYaBSLdn68oJJulU0Q@public.gmane.org>
2012-04-19 19:28 ` Dave Airlie
[not found] ` <CAPM=9tzK83yYS33eNruvFDwb62ycZxJMC31davVRN=yaZD53YA-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2012-04-19 20:40 ` Thierry Reding
[not found] ` <20120419204016.GA8954-RM9K5IK7kjIQXX3q8xo1gnVAuStQJXxyR5q1nwbD4aMs9pC9oP6+/A@public.gmane.org>
2012-04-19 20:59 ` Jon Mayo
[not found] ` <4F907CBB.4080705-DDmLM1+adcrQT0dZR+AlfA@public.gmane.org>
2012-04-20 5:02 ` Thierry Reding
[not found] ` <20120420050231.GA15313-RM9K5IK7kjIyiCvfTdI0JKcOhU4Rzj621B7CTYaBSLdn68oJJulU0Q@public.gmane.org>
2012-04-20 6:05 ` Lucas Stach
2012-04-20 19:54 ` Jon Mayo
2012-04-19 22:21 ` Jerome Glisse
[not found] ` <CAH3drwZhTzuOVfybB_KBgk22csK47xXv5G4aMOuqPy+ibKd21A-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2012-04-20 5:05 ` Thierry Reding
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