linux-kernel - Re: [PATCH v7 5/9] PCI: Add pci_iomap

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Message-ID: <1435272718.3822.7.camel@kernel.crashing.org>
Date:	Fri, 26 Jun 2015 08:51:58 +1000
From:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
To:	Casey Leedom <leedom@...lsio.com>
Cc:	Arnd Bergmann <arnd@...db.de>,
	"Luis R. Rodriguez" <mcgrof@...e.com>,
	"Michael S. Tsirkin" <mst@...hat.com>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	Toshi Kani <toshi.kani@...com>,
	Andy Lutomirski <luto@...capital.net>,
	Juergen Gross <jgross@...e.com>,
	Tomi Valkeinen <tomi.valkeinen@...com>,
	"linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"xen-devel@...ts.xensource.com" <xen-devel@...ts.xensource.com>,
	linux-fbdev <linux-fbdev@...r.kernel.org>,
	Suresh Siddha <sbsiddha@...il.com>,
	Ingo Molnar <mingo@...e.hu>,
	Thomas Gleixner <tglx@...utronix.de>,
	Daniel Vetter <daniel.vetter@...ll.ch>,
	Dave Airlie <airlied@...hat.com>,
	Antonino Daplas <adaplas@...il.com>,
	Jean-Christophe Plagniol-Villard <plagnioj@...osoft.com>,
	Dave Hansen <dave.hansen@...ux.intel.com>,
	"venkatesh.pallipadi@...el.com" <venkatesh.pallipadi@...el.com>,
	Stefan Bader <stefan.bader@...onical.com>,
	<ville.syrjala@...ux.intel.com>,
	David Vrabel <david.vrabel@...rix.com>,
	Jan Beulich <jbeulich@...e.com>,
	Roger Pau Monné <roger.pau@...rix.com>
Subject: Re: [PATCH v7 5/9] PCI: Add pci_iomap_wc() variants

On Thu, 2015-06-25 at 21:40 +0000, Casey Leedom wrote:
> Hhmmm, so what do PowerPC Drivers do when they want to take
> advantage of Write Combining?  Do their own Endian Swizzling
> with the __raw_*() APIs?

Yeah either, we need to fix our relaxed implementation (patch
welcome :-)

Cheers,
Ben.


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