linux-kernel - Re: [PATCH v1 05/47] pci: add pci_iomap

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Date:	Fri, 27 Mar 2015 13:18:36 -0600
From:	Toshi Kani <toshi.kani@...com>
To:	Bjorn Helgaas <bhelgaas@...gle.com>
Cc:	"Luis R. Rodriguez" <mcgrof@...not-panic.com>,
	Andy Lutomirski <luto@...capital.net>,
	Ingo Molnar <mingo@...hat.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...or.com>, jgross@...e.com,
	Jan Beulich <JBeulich@...e.com>, Borislav Petkov <bp@...e.de>,
	Suresh Siddha <suresh.b.siddha@...el.com>,
	venkatesh.pallipadi@...el.com, Dave Airlie <airlied@...hat.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	linux-fbdev@...r.kernel.org, "x86@...nel.org" <x86@...nel.org>,
	"xen-devel@...ts.xenproject.org" <xen-devel@...ts.xenproject.org>,
	"Luis R. Rodriguez" <mcgrof@...e.com>, Ingo Molnar <mingo@...e.hu>,
	Daniel Vetter <daniel.vetter@...ll.ch>,
	Antonino Daplas <adaplas@...il.com>,
	Jean-Christophe Plagniol-Villard <plagnioj@...osoft.com>,
	Tomi Valkeinen <tomi.valkeinen@...com>,
	Dave Hansen <dave.hansen@...ux.intel.com>,
	Arnd Bergmann <arnd@...db.de>,
	"Michael S. Tsirkin" <mst@...hat.com>,
	Stefan Bader <stefan.bader@...onical.com>,
	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
	Ville Syrjälä 
	<ville.syrjala@...ux.intel.com>,
	David Vrabel <david.vrabel@...rix.com>,
	Roger Pau Monné <roger.pau@...rix.com>,
	xen-devel <xen-devel@...ts.xensource.com>
Subject: Re: [PATCH v1 05/47] pci: add pci_iomap_wc() variants

On Mon, 2015-03-23 at 12:20 -0500, Bjorn Helgaas wrote:
 :
> pci_iomap_range() already makes a cacheable mapping if
> IORESOURCE_CACHEABLE; I'm guessing that you would like it to
> automatically use WC if the BAR if IORESOURCE_PREFETCH, e.g.,
> 
>   if (flags & IORESOURCE_CACHEABLE)
>     return ioremap(start, len);

Is this supposed to be ioremap_cache()?  ioremap() is the same as
ioremap_nocache() at least on x86 per arch/x86/include/asm/io.h.

>   if (flags & IORESOURCE_PREFETCH)
>     return ioremap_wc(start, len);
>   return ioremap_nocache(start, len);
> 

-Toshi


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