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From: Daniel Vetter <daniel-/w4YWyX8dFk@public.gmane.org>
To: Thierry Reding
	<thierry.reding-RM9K5IK7kjKj5M59NBduVrNAH6kLmebB@public.gmane.org>
Cc: Daniel Vetter <daniel-/w4YWyX8dFk@public.gmane.org>,
	linux-tegra-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
	Stephen Warren <swarren-3lzwWm7+Weoh9ZMKESR00Q@public.gmane.org>,
	Joerg Roedel <joerg.roedel-5C7GfCeVMHo@public.gmane.org>,
	devicetree-discuss-uLR06cmDAlY/bJ5BZ2RsiQ@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>,
	Hiroshi Doyu <hdoyu-DDmLM1+adcrQT0dZR+AlfA@public.gmane.org>
Subject: Re: [RFC 4/4] drm: Add NVIDIA Tegra support
Date: Wed, 11 Apr 2012 15:35:12 +0200	[thread overview]
Message-ID: <20120411133512.GL4296@phenom.ffwll.local> (raw)
In-Reply-To: <20120411132326.GD27337-RM9K5IK7kjIyiCvfTdI0JKcOhU4Rzj621B7CTYaBSLdn68oJJulU0Q@public.gmane.org>

On Wed, Apr 11, 2012 at 03:23:26PM +0200, Thierry Reding wrote:
> * Daniel Vetter wrote:
> > On Wed, Apr 11, 2012 at 02:10:30PM +0200, Thierry Reding wrote:
> > > This commit adds a very basic DRM driver for NVIDIA Tegra SoCs. It
> > > currently has rudimentary GEM support and can run a console on the
> > > framebuffer as well as X using the xf86-video-modesetting driver.
> > > Only the RGB output is supported. Quite a lot of things still need
> > > to be worked out and there is a lot of room for cleanup.
> > 
> > Indeed, after a quick look there are tons of functions that are just stubs
> > ;-) One thing I wonder though is why you directly use the iommu api and
> > not wrap it up into dma_map? Is arm infrastructure just not there yet or
> > do you plan to tightly integrate the tegra drm with the iommu (e.g. for
> > process space switching or similarly funky stuff)?
> 
> I'm not sure I know what you are referring to. Looking for all users of
> iommu_map() doesn't turn up anything related to dma_map. Can you point me in
> the right direction?

Well, you use the iommu api to map/unmap memory into the iommu for tegra,
whereas usually device drivers just use the dma api to do that. The usual
interface is dma_map_sg/dma_unmap_sg, but there are quite a few variants
around. I'm just wondering why this you've choosen this.
-Daniel
-- 
Daniel Vetter
Mail: daniel-/w4YWyX8dFk@public.gmane.org
Mobile: +41 (0)79 365 57 48

  parent reply	other threads:[~2012-04-11 13:35 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 [this message]
     [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
     [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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