linux-kernel - Re: [RFC] How implement Secure Data Path ?

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Message-ID: <CA+M3ks6fddVwvwiUSBkMccV7utVVuB=iBqGonURimavM=sSWUw@mail.gmail.com>
Date:	Tue, 12 May 2015 10:46:26 +0200
From:	Benjamin Gaignard <benjamin.gaignard@...aro.org>
To:	One Thousand Gnomes <gnomes@...rguk.ukuu.org.uk>
Cc:	Daniel Vetter <daniel@...ll.ch>,
	Thierry Reding <treding@...dia.com>,
	"linux-media@...r.kernel.org" <linux-media@...r.kernel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	"dri-devel@...ts.freedesktop.org" <dri-devel@...ts.freedesktop.org>,
	Hans Verkuil <hverkuil@...all.nl>,
	Laurent Pinchart <laurent.pinchart@...asonboard.com>,
	Rob Clark <robdclark@...il.com>,
	Dave Airlie <airlied@...hat.com>,
	Sumit Semwal <sumit.semwal@...aro.org>,
	Tom Gall <tom.gall@...aro.org>
Subject: Re: [RFC] How implement Secure Data Path ?

I think now I have an answer to my question.

I will back come in a couple of weeks with a generic dmabuf allocator.
The feature set of this should be:
- allow to have per device specificone  allocator
- ioctl for buffer allocation and exporting dmabuf file descriptor on /dev/foo
- generic API to be able to call buffer securing module which is
platform specific.
- ioctl and kernel API to set/get dmabuf secure status

Sumit had already done a draft of this kind of dmabuf allocator with
his cenalloc [1]
I think I will start from that.

Benjamin

[1] http://git.linaro.org/people/sumit.semwal/linux-3.x.git on
cenalloc_wip branch.
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