linux-kernel - Re: PAGE_CACHE

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Message-ID: <21d7e9970903312018l1a74cfadoc6540dcda7fdeb53@mail.gmail.com>
Date:	Wed, 1 Apr 2009 13:18:30 +1000
From:	Dave Airlie <airlied@...il.com>
To:	Jesse Barnes <jbarnes@...tuousgeek.org>
Cc:	suresh.b.siddha@...el.com,
	"Pallipadi, Venkatesh" <venkatesh.pallipadi@...el.com>,
	Eric Anholt <eric@...olt.net>,
	lkml <linux-kernel@...r.kernel.org>
Subject: Re: PAGE_CACHE_WC strikes again

On Wed, Apr 1, 2009 at 11:57 AM, Jesse Barnes <jbarnes@...tuousgeek.org> wrote:
> On Tue, 31 Mar 2009 17:30:24 -0800
> Suresh Siddha <suresh.b.siddha@...el.com> wrote:
>
>> On Tue, 2009-03-31 at 18:12 -0700, Jesse Barnes wrote:
>> > Right, the drm driver code went in before we had
>> > pgprot_writecombine. Now that it's available we should definitely
>> > use it.  I'm not sure about the set_memory_* routines though; we
>> > create io mappings in i915_dma.c at init time, and I thought we
>> > took care of things in i915_gem.c but we may need updates there.
>>
>> Jesse, yes i915_gem.c seems to be doing the right thing.
>>
>> What about various fault handlers in drm_vm.c like
>> drm_do_vm_shm_fault() etc. None of these fault handlers require
>> special attributes like wc/uc etc?
>
> Those are legacy.  I don't think they need anything changed...  Dave
> could correct me though.

Yeah just don't look at the top of drm_vm.c:drm_io_prot.

the attribute handling in there is one of the bits of the drm I hide away from.

and I think we can just move away from that with memory managed
drivers doing it properly.

Dave.
>
> --
> Jesse Barnes, Intel Open Source Technology Center
>
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