From: Thierry Reding <thierry.reding-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
To: Mikko Perttunen <mperttunen-DDmLM1+adcrQT0dZR+AlfA@public.gmane.org>
Cc: linux-tegra-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
dri-devel-PD4FTy7X32lNgt0PjOBp9y5qC8QIuHrW@public.gmane.org,
airlied-cv59FeDIM0c@public.gmane.org
Subject: Re: [PATCH 2/8] drm/tegra: Allocate BOs from lower 4G when without IOMMU
Date: Mon, 5 Dec 2016 19:39:55 +0100 [thread overview]
Message-ID: <20161205183955.GB22918@ulmo.ba.sec> (raw)
In-Reply-To: <20161110182345.31777-3-mperttunen-DDmLM1+adcrQT0dZR+AlfA@public.gmane.org>
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On Thu, Nov 10, 2016 at 08:23:39PM +0200, Mikko Perttunen wrote:
> On 64-bit Tegras, buffer object memory allocation may
> return memory above 4G that units behind Host1x cannot
> access. Add the GFP_DMA flag to these allocation when
> IOMMU is not enabled to ensure units can always access
> BO memory.
I don't think that's entirely true. The display controller can address
more than 32 bits. It's perhaps slightly different from other units that
are behind host1x, but maybe we need a special case here to allow frame-
buffers to reside in higher memory?
Thierry
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next prev parent reply other threads:[~2016-12-05 18:39 UTC|newest]
Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-11-10 18:23 [PATCH 0/8] Host1x IOMMU support + VIC support Mikko Perttunen
2016-11-10 18:23 ` [PATCH 1/8] drm/tegra: Add Tegra DRM allocation API Mikko Perttunen
[not found] ` <20161110182345.31777-2-mperttunen-DDmLM1+adcrQT0dZR+AlfA@public.gmane.org>
2016-12-05 18:37 ` Thierry Reding
[not found] ` <20161205183726.GA22918-EkSeR96xj6Pcmrwk2tT4+A@public.gmane.org>
2016-12-07 9:23 ` Mikko Perttunen
2016-11-10 18:23 ` [PATCH 2/8] drm/tegra: Allocate BOs from lower 4G when without IOMMU Mikko Perttunen
[not found] ` <20161110182345.31777-3-mperttunen-DDmLM1+adcrQT0dZR+AlfA@public.gmane.org>
2016-12-05 18:39 ` Thierry Reding [this message]
[not found] ` <20161205183955.GB22918-EkSeR96xj6Pcmrwk2tT4+A@public.gmane.org>
2016-12-07 9:32 ` Mikko Perttunen
[not found] ` <20161110182345.31777-1-mperttunen-DDmLM1+adcrQT0dZR+AlfA@public.gmane.org>
2016-11-10 18:23 ` [PATCH 3/8] drm/tegra: Add falcon helper library Mikko Perttunen
2016-12-05 19:13 ` Thierry Reding
[not found] ` <20161205191346.GC22918-EkSeR96xj6Pcmrwk2tT4+A@public.gmane.org>
2016-12-07 11:54 ` Mikko Perttunen
2016-11-10 18:23 ` [PATCH 4/8] drm/tegra: Add VIC support Mikko Perttunen
2016-12-05 19:35 ` Thierry Reding
[not found] ` <20161205193559.GD22918-EkSeR96xj6Pcmrwk2tT4+A@public.gmane.org>
2016-12-14 8:28 ` Mikko Perttunen
2016-11-10 18:23 ` [PATCH 7/8] arm64: tegra: Enable VIC on T210 Mikko Perttunen
2016-11-10 18:23 ` [PATCH 8/8] arm64: tegra: Enable IOMMU for Host1x on Tegra210 Mikko Perttunen
2016-12-05 13:25 ` [PATCH 0/8] Host1x IOMMU support + VIC support Mikko Perttunen
2016-11-10 18:23 ` [PATCH 5/8] gpu: host1x: Add IOMMU support Mikko Perttunen
2016-12-05 19:49 ` Thierry Reding
[not found] ` <20161205194924.GE22918-EkSeR96xj6Pcmrwk2tT4+A@public.gmane.org>
2016-12-14 8:50 ` Mikko Perttunen
2016-11-10 18:23 ` [PATCH 6/8] dt-bindings: Add bindings for the Tegra VIC Mikko Perttunen
2016-12-05 19:51 ` [PATCH 0/8] Host1x IOMMU support + VIC support Thierry Reding
[not found] ` <20161205195131.GF22918-EkSeR96xj6Pcmrwk2tT4+A@public.gmane.org>
2016-12-05 19:58 ` Mikko Perttunen
2016-12-06 7:14 ` Daniel Vetter
[not found] ` <20161206071450.uedxvvtcxbkwsoza-dv86pmgwkMBes7Z6vYuT8azUEOm+Xw19@public.gmane.org>
2016-12-06 9:33 ` Mikko Perttunen
2016-12-07 10:36 ` Daniel Vetter
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