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Re: [Xen-devel] [PATCH v1 05/47] pci: add pci_iomap_wc() variants
- To: Bjorn Helgaas <bhelgaas@xxxxxxxxxx>
- From: Toshi Kani <toshi.kani@xxxxxx>
- Date: Fri, 27 Mar 2015 13:18:36 -0600
- Cc: linux-fbdev@xxxxxxxxxxxxxxx, "Michael S. Tsirkin" <mst@xxxxxxxxxx>, Daniel Vetter <daniel.vetter@xxxxxxxx>, Dave Hansen <dave.hansen@xxxxxxxxxxxxxxx>, Jan Beulich <JBeulich@xxxxxxxx>, "H. Peter Anvin" <hpa@xxxxxxxxx>, Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx>, xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxx>, Suresh Siddha <suresh.b.siddha@xxxxxxxxx>, Tomi Valkeinen <tomi.valkeinen@xxxxxx>, "x86@xxxxxxxxxx" <x86@xxxxxxxxxx>, Ingo Molnar <mingo@xxxxxxxxxx>, "xen-devel@xxxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxxx>, Ingo Molnar <mingo@xxxxxxx>, Borislav Petkov <bp@xxxxxxx>, Jean-Christophe Plagniol-Villard <plagnioj@xxxxxxxxxxxx>, Antonino Daplas <adaplas@xxxxxxxxx>, "Luis R. Rodriguez" <mcgrof@xxxxxxxx>, Stefan Bader <stefan.bader@xxxxxxxxxxxxx>, Dave Airlie <airlied@xxxxxxxxxx>, Thomas Gleixner <tglx@xxxxxxxxxxxxx>, jgross@xxxxxxxx, "Luis R. Rodriguez" <mcgrof@xxxxxxxxxxxxxxxx>, "linux-kernel@xxxxxxxxxxxxxxx" <linux-kernel@xxxxxxxxxxxxxxx>, Andy Lutomirski <luto@xxxxxxxxxxxxxx>, Arnd Bergmann <arnd@xxxxxxxx>, David Vrabel <david.vrabel@xxxxxxxxxx>, venkatesh.pallipadi@xxxxxxxxx, Roger Pau Monné <roger.pau@xxxxxxxxxx>
- Delivery-date: Fri, 27 Mar 2015 19:37:12 +0000
- List-id: Xen developer discussion <xen-devel.lists.xen.org>
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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