linux-kernel - Re: [Intel-gfx] Ugly patches for stolen reservation

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Message-ID: <CAKMK7uE_NCBG-2KqA0WTx1neDaiyvsNeF8CbGx16FArNde50RQ@mail.gmail.com>
Date:	Fri, 26 Jul 2013 22:45:31 +0200
From:	Daniel Vetter <daniel@...ll.ch>
To:	"H. Peter Anvin" <hpa@...or.com>
Cc:	Ingo Molnar <mingo@...nel.org>,
	intel-gfx <intel-gfx@...ts.freedesktop.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Ingo Molnar <mingo@...e.hu>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [Intel-gfx] Ugly patches for stolen reservation

On Fri, Jul 26, 2013 at 10:28 PM, H. Peter Anvin <hpa@...or.com> wrote:
> On 07/26/2013 01:24 PM, Ingo Molnar wrote:
>>
>> Am I being too pedantic in expecting that we still mark it
>> e820-reserved?
>>
>> This area really isnt an ordinary PCI resource such as a
>> BAR or an MMIO region. It's truly system RAM (which cannot
>> be moved/reallocated), used by graphics hardware, and the
>> firmware should have marked it reserved.
>>
>> (The end result should be the same in any case, so this is
>> a detail.)
>>
>
> I, too, would prefer to see it marked as reserved.

Yeah, current patches mark it as reserved. But since we don't want to
duplicate the detection code we want to switch to a more unique name
when mapping the e820 region into a iomem reservation so that when
i915.ko loads we can dig it out again.
-Daniel
--
Daniel Vetter
Software Engineer, Intel Corporation
+41 (0) 79 365 57 48 - http://blog.ffwll.ch
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