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Re: [Xen-devel] [PATCH v7 5/9] PCI: Add pci_iomap_wc() variants
- To: Benjamin Herrenschmidt <benh@xxxxxxxxxxxxxxxxxxx>, Russell King <linux@xxxxxxxxxxxxxxxx>, Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>
- From: "Luis R. Rodriguez" <mcgrof@xxxxxxxx>
- Date: Fri, 26 Jun 2015 18:16:08 -0700
- Cc: linux-fbdev <linux-fbdev@xxxxxxxxxxxxxxx>, "Michael S. Tsirkin" <mst@xxxxxxxxxx>, "linux-pci@xxxxxxxxxxxxxxx" <linux-pci@xxxxxxxxxxxxxxx>, Dave Hansen <dave.hansen@xxxxxxxxxxxxxxx>, Jan Beulich <jbeulich@xxxxxxxx>, Ville SyrjÃlà <ville.syrjala@xxxxxxxxxxxxxxx>, "xen-devel@xxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxx>, Arnd Bergmann <arnd@xxxxxxxx>, Tomi Valkeinen <tomi.valkeinen@xxxxxx>, Suresh Siddha <sbsiddha@xxxxxxxxx>, Dave Airlie <airlied@xxxxxxxxxx>, Ingo Molnar <mingo@xxxxxxx>, Jean-Christophe Plagniol-Villard <plagnioj@xxxxxxxxxxxx>, Casey Leedom <leedom@xxxxxxxxxxx>, Antonino Daplas <adaplas@xxxxxxxxx>, Stefan Bader <stefan.bader@xxxxxxxxxxxxx>, Daniel Vetter <daniel.vetter@xxxxxxxx>, Bjorn Helgaas <bhelgaas@xxxxxxxxxx>, Thomas Gleixner <tglx@xxxxxxxxxxxxx>, Juergen Gross <jgross@xxxxxxxx>, Toshi Kani <toshi.kani@xxxxxx>, "linux-kernel@xxxxxxxxxxxxxxx" <linux-kernel@xxxxxxxxxxxxxxx>, Andy Lutomirski <luto@xxxxxxxxxxxxxx>, David Vrabel <david.vrabel@xxxxxxxxxx>, "venkatesh.pallipadi@xxxxxxxxx" <venkatesh.pallipadi@xxxxxxxxx>, Roger Pau Monnà <roger.pau@xxxxxxxxxx>
- Delivery-date: Sat, 27 Jun 2015 01:16:56 +0000
- List-id: Xen developer discussion <xen-devel.lists.xen.org>
On Fri, Jun 26, 2015 at 4:54 PM, Benjamin Herrenschmidt
<benh@xxxxxxxxxxxxxxxxxxx> wrote:
> On Fri, 2015-06-26 at 15:41 -0700, Luis R. Rodriguez wrote:
>
>> > It wasn't nullified for the main user at the time, the fb. And I
>> > mentioned an IB adapter or two for which the code had been hand
>> tuned.
>>
>> This still means there could be some affected drivers when used on
>> powerpc, no?
>
> Yes. In fact what about things like ARM who also have barriers in their
> writel() ? Won't they also break WC ?
Not sure if they have that write-combine notion on their CPUs /
interconnects. Russel, Stefano, does ARM have write-combining ?
Luis
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