linux-kernel - Re: [PATCH v2 25/27] ia64: Use generic pci_mmap_resource

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Date:   Thu, 13 Apr 2017 09:39:06 +0100
From:   David Woodhouse <dwmw2@...radead.org>
To:     Tony Luck <tony.luck@...il.com>
Cc:     "linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
        "linux-arch@...r.kernel.org" <linux-arch@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 25/27] ia64: Use generic pci_mmap_resource_range()

On Wed, 2017-04-12 at 14:47 -0700, Tony Luck wrote:
> On Wed, Apr 12, 2017 at 5:26 AM, David Woodhouse <dwmw2@...radead.org> wrote:
> > 
> > From: David Woodhouse <dwmw@...zon.co.uk>
> > 
> > Now that we eliminated the different behaviour in separately-reviewable
> > commits, we can switch IA64 to the generic implementation.
> > 
> > Signed-off-by: David Woodhouse <dwmw@...zon.co.uk>
>
> Well it builds and boots on my last remaining ia64 machine. No warnings
> or weird stuff in the console log.  So you can mark the three ia64 patches

Thanks. The interesting test is whether you can correctly map PCI BARs
through /proc/bus/pci and /sys/bus/pci?

And if you find a prefetchable BAR you can scribble on, does the box
explode if you do it both WC and UC at the same time?

http://david.woodhou.se/pcimmap_copy.c should validate WC mappings and
look something like this...

[fedora@...172-31-55-194 ~]$ sudo ./pcimmap_copy /sys/bus/pci/devices/0000\:00\:1e.0/resource4 0
Copied 1000 loops in 0.354437301s
[fedora@...172-31-55-194 ~]$ sudo ./pcimmap_copy /sys/bus/pci/devices/0000\:00\:1e.0/resource4_wc 0
Copied 1000 loops in 0.057309254s

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