linux-kernel - Re: [RFC v2 1/8] video: tegra: Add nvhost driver

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Message-ID: <50BA3ACD.9080104@nvidia.com>
Date:	Sat, 1 Dec 2012 19:13:49 +0200
From:	Terje Bergström <tbergstrom@...dia.com>
To:	Thierry Reding <thierry.reding@...onic-design.de>
CC:	"linux-tegra@...r.kernel.org" <linux-tegra@...r.kernel.org>,
	"dri-devel@...ts.freedesktop.org" <dri-devel@...ts.freedesktop.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [RFC v2 1/8] video: tegra: Add nvhost driver

On 01.12.2012 16:58, Thierry Reding wrote:
> I don't know where you see politics in what I said. All I'm saying is
> that we shouldn't be making things needlessly complex. In my experience
> the technically cleanest solution is usually the one with the least
> complexity.

Let me come up with a proposal and let's then see where to go next.

> But you already have extra code in the kernel to patch out expired sync-
> points. Is it really worth the added effort to burden userspace with
> this? If so I still think some kind of generic IOCTL to retrieve
> information about a syncpoint would be better than a sysfs interface.

That's exactly why I mentioned that it's not useful to upstream. There
are some cases where user space might want to check if a fence has
passed without waiting for it, but that's marginal and could be handled
even with waits with zero timeout.

Terje
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