From: "Terje Bergström" <tbergstrom-DDmLM1+adcrQT0dZR+AlfA@public.gmane.org>
To: Arto Merilainen <amerilainen-DDmLM1+adcrQT0dZR+AlfA@public.gmane.org>
Cc: Thierry Reding
<thierry.reding-RM9K5IK7kjKj5M59NBduVrNAH6kLmebB@public.gmane.org>,
"linux-tegra-u79uwXL29TY76Z2rM5mHXA@public.gmane.org"
<linux-tegra-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>
Subject: Re: [PATCH 5/6] gpu: drm: tegra: Prime support
Date: Mon, 26 Nov 2012 11:30:26 +0200 [thread overview]
Message-ID: <50B336B2.2030104@nvidia.com> (raw)
In-Reply-To: <7DC9167CA73B39468DFA1D07FF67A6A85150E61DDB-LZBqo6t42cZDw2glCA4ptUEOCMrvLtNR@public.gmane.org>
On 26.11.2012 09:33, Arto Merilainen wrote:
> AFAIK dma-mapping API is not smart enough to determine whether a
> given buffer is already mapped to some address space. It just maps
> and potentially creates duplicates (please correct me if I am wrong).
> Therefore, if the "generic case solution" is applied to our "specific
> case", there will always be duplicates and I do not think that is a
> good practice. I also considered doing a smart optimisation here, but
> dma-mapping API did not seem to support querying of the address space
> of a certain device.
This coupled with the facts that CMA helper calls dma mapping API, and
that CMA helper doesn't know if IOMMU is enabled or disabled for a
particular device, we need to keep the prime support as tegradrm
specific code for now.
Terje
next prev parent reply other threads:[~2012-11-26 9:30 UTC|newest]
Thread overview: 31+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-11-22 9:47 [PATCH 0/6] Support for Tegra 2D hardware Terje Bergstrom
[not found] ` <1353577684-7896-1-git-send-email-tbergstrom-DDmLM1+adcrQT0dZR+AlfA@public.gmane.org>
2012-11-22 9:47 ` [PATCH 1/6] video: tegra: Add nvhost driver Terje Bergstrom
[not found] ` <1353577684-7896-2-git-send-email-tbergstrom-DDmLM1+adcrQT0dZR+AlfA@public.gmane.org>
2012-11-23 23:38 ` Thierry Reding
[not found] ` <20121123233855.GD21555-RM9K5IK7kjIyiCvfTdI0JKcOhU4Rzj621B7CTYaBSLdn68oJJulU0Q@public.gmane.org>
2012-11-24 7:00 ` Terje Bergström
[not found] ` <50B07084.40707-DDmLM1+adcrQT0dZR+AlfA@public.gmane.org>
2012-11-24 19:04 ` Thierry Reding
[not found] ` <20121124190416.GC26154-RM9K5IK7kjIyiCvfTdI0JKcOhU4Rzj621B7CTYaBSLdn68oJJulU0Q@public.gmane.org>
2012-11-24 20:02 ` Terje Bergström
2012-11-26 8:21 ` Terje Bergström
[not found] ` <50B32690.7020102-DDmLM1+adcrQT0dZR+AlfA@public.gmane.org>
2012-11-26 9:25 ` Thierry Reding
[not found] ` <20121126092524.GB8602-RM9K5IK7kjIyiCvfTdI0JKcOhU4Rzj621B7CTYaBSLdn68oJJulU0Q@public.gmane.org>
2012-11-26 9:33 ` Terje Bergström
2012-11-26 13:42 ` Terje Bergström
2012-11-22 9:48 ` [PATCH 2/6] ARM: tegra: Add auxiliary data for nvhost Terje Bergstrom
[not found] ` <1353577684-7896-3-git-send-email-tbergstrom-DDmLM1+adcrQT0dZR+AlfA@public.gmane.org>
2012-11-23 23:45 ` Thierry Reding
[not found] ` <20121123234527.GE21555-RM9K5IK7kjIyiCvfTdI0JKcOhU4Rzj621B7CTYaBSLdn68oJJulU0Q@public.gmane.org>
2012-11-24 7:09 ` Terje Bergström
[not found] ` <50B07297.3090001-DDmLM1+adcrQT0dZR+AlfA@public.gmane.org>
2012-11-24 19:11 ` Thierry Reding
[not found] ` <20121124191103.GD26154-RM9K5IK7kjIyiCvfTdI0JKcOhU4Rzj621B7CTYaBSLdn68oJJulU0Q@public.gmane.org>
2012-11-26 9:40 ` Terje Bergström
[not found] ` <50B338F2.5060501-DDmLM1+adcrQT0dZR+AlfA@public.gmane.org>
2012-11-26 22:53 ` Stephen Warren
2012-11-26 13:56 ` Terje Bergström
2012-11-22 9:48 ` [PATCH 3/6] gpu: drm: tegra: Remove redundant host1x Terje Bergstrom
[not found] ` <1353577684-7896-4-git-send-email-tbergstrom-DDmLM1+adcrQT0dZR+AlfA@public.gmane.org>
2012-11-23 23:19 ` Thierry Reding
2012-11-22 9:48 ` [PATCH 4/6] gpu: drm: tegra: Free platform data on remove Terje Bergstrom
[not found] ` <1353577684-7896-5-git-send-email-tbergstrom-DDmLM1+adcrQT0dZR+AlfA@public.gmane.org>
2012-11-23 21:53 ` Thierry Reding
[not found] ` <20121123215305.GA21555-RM9K5IK7kjIyiCvfTdI0JKcOhU4Rzj621B7CTYaBSLdn68oJJulU0Q@public.gmane.org>
2012-11-26 7:33 ` Arto Merilainen
2012-11-22 9:48 ` [PATCH 5/6] gpu: drm: tegra: Prime support Terje Bergstrom
[not found] ` <1353577684-7896-6-git-send-email-tbergstrom-DDmLM1+adcrQT0dZR+AlfA@public.gmane.org>
2012-11-23 21:55 ` Thierry Reding
[not found] ` <20121123215528.GB21555-RM9K5IK7kjIyiCvfTdI0JKcOhU4Rzj621B7CTYaBSLdn68oJJulU0Q@public.gmane.org>
2012-11-24 7:11 ` Terje Bergström
[not found] ` <50B0733D.4040002-DDmLM1+adcrQT0dZR+AlfA@public.gmane.org>
2012-11-24 19:14 ` Thierry Reding
[not found] ` <20121124191445.GE26154-RM9K5IK7kjIyiCvfTdI0JKcOhU4Rzj621B7CTYaBSLdn68oJJulU0Q@public.gmane.org>
2012-11-24 19:59 ` Terje Bergström
[not found] ` <50B12724.7020503-DDmLM1+adcrQT0dZR+AlfA@public.gmane.org>
2012-11-26 7:33 ` Arto Merilainen
[not found] ` <7DC9167CA73B39468DFA1D07FF67A6A85150E61DDB-LZBqo6t42cZDw2glCA4ptUEOCMrvLtNR@public.gmane.org>
2012-11-26 9:30 ` Terje Bergström [this message]
2012-11-22 9:48 ` [PATCH 6/6] drm: tegra: Add gr2d device Terje Bergstrom
-- strict thread matches above, loose matches on Subject: below --
2012-11-22 12:16 [PATCH 0/6] Support for Tegra 2D hardware Terje Bergstrom
[not found] ` <1353586614-7308-1-git-send-email-tbergstrom-DDmLM1+adcrQT0dZR+AlfA@public.gmane.org>
2012-11-22 12:16 ` [PATCH 5/6] gpu: drm: tegra: Prime support Terje Bergstrom
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