linux-kernel - Re: [PATCH v3 1/4] pci: add pci_ioremap_wc

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Date:	Wed, 20 May 2015 14:06:15 -0700
From:	"Luis R. Rodriguez" <mcgrof@...not-panic.com>
To:	Bjorn Helgaas <bhelgaas@...gle.com>
Cc:	"Michael S. Tsirkin" <mst@...hat.com>,
	Jean-Christophe Plagniol-Villard <plagnioj@...osoft.com>,
	Tomi Valkeinen <tomi.valkeinen@...com>,
	linux-fbdev <linux-fbdev@...r.kernel.org>,
	Andy Lutomirski <luto@...capital.net>,
	"cocci@...teme.lip6.fr" <cocci@...teme.lip6.fr>,
	Toshi Kani <toshi.kani@...com>,
	Suresh Siddha <sbsiddha@...il.com>,
	Ingo Molnar <mingo@...e.hu>,
	Thomas Gleixner <tglx@...utronix.de>,
	Juergen Gross <jgross@...e.com>,
	Daniel Vetter <daniel.vetter@...ll.ch>,
	Dave Airlie <airlied@...hat.com>,
	Antonino Daplas <adaplas@...il.com>,
	Ville Syrjälä <syrjala@....fi>,
	Mel Gorman <mgorman@...e.de>, Vlastimil Babka <vbabka@...e.cz>,
	Borislav Petkov <bp@...e.de>, Davidlohr Bueso <dbueso@...e.de>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v3 1/4] pci: add pci_ioremap_wc_bar()

On Wed, May 20, 2015 at 2:02 PM, Bjorn Helgaas <bhelgaas@...gle.com> wrote:
> On Tue, Apr 21, 2015 at 01:20:31PM -0700, Luis R. Rodriguez wrote:
>> From: "Luis R. Rodriguez" <mcgrof@...e.com>
>>
>> This lets drivers take advantage of PAT when available. This
>> should help with the transition of converting video drivers over
>> to ioremap_wc() to help with the goal of eventually using
>> _PAGE_CACHE_UC over _PAGE_CACHE_UC_MINUS on x86 on
>> ioremap_nocache() (de33c442e titled "x86 PAT: fix performance
>> drop for glx, use UC minus for ioremap(), ioremap_nocache() and
>> pci_mmap_page_range()")
>>
>> Cc: Toshi Kani <toshi.kani@...com>
>> Cc: Bjorn Helgaas <bhelgaas@...gle.com>
>> Cc: Suresh Siddha <sbsiddha@...il.com>
>> Cc: Ingo Molnar <mingo@...e.hu>
>> Cc: Thomas Gleixner <tglx@...utronix.de>
>> Cc: Juergen Gross <jgross@...e.com>
>> Cc: Daniel Vetter <daniel.vetter@...ll.ch>
>> Cc: Andy Lutomirski <luto@...capital.net>
>> Cc: Dave Airlie <airlied@...hat.com>
>> Cc: Antonino Daplas <adaplas@...il.com>
>> Cc: Jean-Christophe Plagniol-Villard <plagnioj@...osoft.com>
>> Cc: Tomi Valkeinen <tomi.valkeinen@...com>
>> Cc: Ville Syrjälä <syrjala@....fi>
>> Cc: Mel Gorman <mgorman@...e.de>
>> Cc: Vlastimil Babka <vbabka@...e.cz>
>> Cc: Borislav Petkov <bp@...e.de>
>> Cc: Davidlohr Bueso <dbueso@...e.de>
>> Cc: linux-fbdev@...r.kernel.org
>> Cc: linux-kernel@...r.kernel.org
>> Signed-off-by: Luis R. Rodriguez <mcgrof@...e.com>
>
> I don't have any objection to this, and I can apply the follow-on patches
> as well, given the appropriate acks and prerequisite patches (ioremap_wc()
> implementation).

OK great, ioremap_wc() has been upstream for a long time. So I'll wait
for Tomi's review of the fbdev changes. Once I get those I can resend
in a series bundled together with the other pending pci / fbdev
changes we just discussed to make things clear.

 Luis
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