linux-kernel - Re: [RFC PATCH 08/12] PAT 64b: coherent mmap and sysfs bin ioctl

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Message-Id: <200712131654.08669.jesse.barnes@intel.com>
Date:	Thu, 13 Dec 2007 16:54:08 -0800
From:	Jesse Barnes <jesse.barnes@...el.com>
To:	venkatesh.pallipadi@...el.com
Cc:	ak@....de, ebiederm@...ssion.com, rdreier@...co.com,
	torvalds@...ux-foundation.org, gregkh@...e.de, airlied@...net.ie,
	davej@...hat.com, mingo@...e.hu, tglx@...utronix.de, hpa@...or.com,
	akpm@...ux-foundation.org, arjan@...radead.org,
	linux-kernel@...r.kernel.org,
	Suresh Siddha <suresh.b.siddha@...el.com>
Subject: Re: [RFC PATCH 08/12] PAT 64b: coherent mmap and sysfs bin ioctl

On Thursday, December 13, 2007 3:55 pm venkatesh.pallipadi@...el.com wrote:
> Forward port of coherent-mmap.patch and sysfs-bin-ioctl.patch to x86 tree.
>
> TBD: Do we need the ioctl interface to sysfs or get the type attribute
> through a different sysfs file. And then actually specify the attribute
> while doing pci_mmap_page_range ;-)
>
> And when this interface is in place, X server has to use this interface for
> WC mapping.

I remember talking with people about using madvise and/or mmap flags to set 
the attributes correctly, but I don't remember whether it was a good idea or 
not...

The advantage of a specific post-mmap call is that it would make setting the 
attribute types a little easier, so either ioctl or madvise seems preferable 
to mmapping over and over with different flags until you get the mapping.

Jesse
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