linux-kernel - Re: [PATCHv3 0/7] Support for Tegra 2D hardware

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:	Thu, 13 Dec 2012 17:33:39 +0200
From:	Terje Bergström <tbergstrom@...dia.com>
To:	Lucas Stach <dev@...xeye.de>
CC:	"thierry.reding@...onic-design.de" <thierry.reding@...onic-design.de>,
	"linux-tegra@...r.kernel.org" <linux-tegra@...r.kernel.org>,
	"dri-devel@...ts.freedesktop.org" <dri-devel@...ts.freedesktop.org>,
	Arto Merilainen <amerilainen@...dia.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCHv3 0/7] Support for Tegra 2D hardware

On 13.12.2012 17:03, Lucas Stach wrote:
> You are still doing the allocation the IMHO wrong way around. I thought
> we agreed to do all the allocations in host1x, which obviously means not
> using the cma_gem_helpers anymore, but introducing a new native host1x
> object to back GEM/V4L/whatever objects. IMHO the current approach is a
> clear layering violation and makes proper IOMMU support a lot harder. It
> would also allow to get rid of all the indirections and ifdefs in host1x
> memmgr, as host1x would only have to deal with it's native objects.
> 
> All the complexity of converting host1x to GEM objects should be located
> in tegradrm and not be scattered between different modules.
> 
> Did you leave this out on purpose in this version of the patchset?

Forgot to mention that, as IOMMU and consequently the "proper"
allocation support was planned as a follow-up. I wanted to keep the
scope of this set as small as possible.

The plan we agreed on still holds.

Terje

>>  * tegradrm has a global variable. Plan was to hide that behind a
>>    virtual device, and use that as DRM root device. That plan went
>>    bad once the FB CMA helper used the device for trying to allocate
>>    memory.
> See above, we should get rid of the helpers and do all allocations
> within host1x.

I noticed that IOMMU and not using the CMA FB helper is now exynos
managed to do this.

Terje
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/