linux-kernel - Re: io resources and cached mappings (was: [git pull] drm patches for 2.6.27-rc1)

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Message-Id: <1224746087-13991-1-git-send-email-keithp@keithp.com>
Date:	Thu, 23 Oct 2008 00:14:45 -0700
From:	Keith Packard <keithp@...thp.com>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	Jesse Barnes <jbarnes@...tuousgeek.org>,
	Nick Piggin <nickpiggin@...oo.com.au>,
	Dave Airlie <airlied@...ux.ie>,
	Yinghai Lu <yinghai@...nel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Keith Packard <keithp@...thp.com>
Subject: Re: io resources and cached mappings (was: [git pull] drm patches for 2.6.27-rc1)


> okay. So ... mind sending your io_mapping patch as a generic facility? 
> It looks all good to me in its present form, except that it should live 
> in include/linux/io.h, not in the drivers/gpu/drm/i915/io_reserve.h file
> :-)

The first patch in this series (assuming I'm driving git-send-email
correctly) adds the io_mapping API. I ended up creating a new
linux/io_mapping.h file as the kernel init code uses io.h and got very angry
when I tried to include linux/highmem.h from that. I'm afraid I gave up at
that point and just moved the code to a new file. 

The second patch switches the drm/i915 driver to the new API. Performance
improvements on 64-bit kernels are impressive as we were using the slow path
before and now get to take advantage of 64-bit wonderfulness.
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