From: Ian Campbell <Ian.Campbell@citrix.com>
To: Jan Beulich <JBeulich@suse.com>
Cc: Tim Deegan <tim@xen.org>,
Oleksandr Dmytryshyn <oleksandr.dmytryshyn@globallogic.com>,
xen-devel@lists.xen.org, Stefano.Stabellini@citrix.com,
Stefano Stabellini <stefano.stabellini@eu.citrix.com>
Subject: Re: [RFC PATCH 11/13] cpufreq: add xen-cpufreq driver
Date: Fri, 10 Oct 2014 16:19:13 +0100 [thread overview]
Message-ID: <1412954353.27111.50.camel@citrix.com> (raw)
In-Reply-To: <5437F25A020000780003DB8D@mail.emea.novell.com>
On Fri, 2014-10-10 at 13:51 +0100, Jan Beulich wrote:
> >>> On 10.10.14 at 11:59, <Ian.Campbell@citrix.com> wrote:
> > A simple i2c driver (without all the generic framework/bus
> > infrastructure which Linux has) is pretty simple.
> >
> > I think the biggest complexity would come from i2c busses with both
> > cpufreq and other devices on them and managing the potentially shared
> > accesses.
>
> And the recently added XENPF_resource_op would seem a pretty
> good candidate for this (except that it requires the Dom0 kernel
> code to stop accessing hardware directly, and instead go through
> this hypercall).
We'd need to introduce a dtb binding for a "pv i2c host controller"
which we would use to replace the actual one for dom0. That might be
doable I think, so long as we take care to preserve the relationships
with other nodes which might reference it.
Ian.
next prev parent reply other threads:[~2014-10-10 15:19 UTC|newest]
Thread overview: 69+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-10-07 14:19 [RFC PATCH 00/13] xen_cpufreq implementation in Xen hypervisor Oleksandr Dmytryshyn
2014-10-07 14:19 ` [RFC PATCH 01/13] cpufreq: move cpufreq.h file to the xen/include/cpufreq location Oleksandr Dmytryshyn
2014-10-07 14:22 ` Andrew Cooper
2014-10-07 14:27 ` Oleksandr Dmytryshyn
2014-10-07 14:35 ` Jan Beulich
2014-10-09 6:04 ` Oleksandr Dmytryshyn
2014-10-07 14:19 ` [RFC PATCH 02/13] pm: move processor_perf.h " Oleksandr Dmytryshyn
2014-10-07 14:19 ` [RFC PATCH 03/13] pmstat: move pmstat.c file to the xen/drivers/pm location Oleksandr Dmytryshyn
2014-10-07 14:38 ` Jan Beulich
2014-10-09 6:05 ` Oleksandr Dmytryshyn
2014-10-07 14:19 ` [RFC PATCH 04/13] cpufreq: use turbo settings only for x86 architecture Oleksandr Dmytryshyn
2014-10-07 14:39 ` Jan Beulich
2014-10-09 6:05 ` Oleksandr Dmytryshyn
2014-10-07 14:19 ` [RFC PATCH 05/13] pmstat: make pmstat functions more generalizable Oleksandr Dmytryshyn
2014-10-07 14:40 ` Jan Beulich
2014-10-09 6:06 ` Oleksandr Dmytryshyn
2014-10-07 14:19 ` [RFC PATCH 06/13] cpufreq: make cpufreq driver " Oleksandr Dmytryshyn
2014-10-07 14:42 ` Jan Beulich
2014-10-09 6:06 ` Oleksandr Dmytryshyn
2014-10-07 14:19 ` [RFC PATCH 07/13] xen/arm: enable cpu hotplug Oleksandr Dmytryshyn
2014-10-07 15:15 ` Julien Grall
2014-10-09 6:07 ` Oleksandr Dmytryshyn
2014-10-07 14:19 ` [RFC PATCH 08/13] xen/dts: make the dt_find_property function to be global Oleksandr Dmytryshyn
2014-10-07 15:09 ` Julien Grall
2014-10-09 6:09 ` Oleksandr Dmytryshyn
2014-10-09 11:15 ` Julien Grall
2014-10-09 11:40 ` Oleksandr Dmytryshyn
2014-10-07 14:19 ` [RFC PATCH 09/13] arch/arm: create device tree nodes for Dom0 cpufreq cpu driver Oleksandr Dmytryshyn
2014-10-07 15:26 ` Julien Grall
2014-10-09 6:10 ` Oleksandr Dmytryshyn
2014-10-07 14:19 ` [RFC PATCH 10/13] xen: arm: implement platform hypercall Oleksandr Dmytryshyn
2014-10-07 15:39 ` Julien Grall
2014-10-09 6:11 ` Oleksandr Dmytryshyn
2014-10-07 14:19 ` [RFC PATCH 11/13] cpufreq: add xen-cpufreq driver Oleksandr Dmytryshyn
2014-10-07 14:44 ` Jan Beulich
2014-10-08 13:51 ` Stefano Stabellini
2014-10-10 9:00 ` Jan Beulich
2014-10-10 9:04 ` Stefano Stabellini
2014-10-10 9:39 ` Jan Beulich
2014-10-10 9:39 ` Stefano Stabellini
2014-10-10 9:46 ` Jan Beulich
2014-10-10 9:54 ` Stefano Stabellini
2014-10-10 9:59 ` Ian Campbell
2014-10-10 12:51 ` Jan Beulich
2014-10-10 14:42 ` Stefano Stabellini
2014-10-13 8:56 ` Oleksandr Dmytryshyn
2014-10-13 9:39 ` Jan Beulich
2014-10-13 11:59 ` Oleksandr Dmytryshyn
2014-10-13 12:28 ` Jan Beulich
2014-10-13 13:38 ` Andrii Tseglytskyi
2014-10-13 14:11 ` Jan Beulich
2014-10-13 14:29 ` Andrii Tseglytskyi
2014-10-14 12:20 ` Jan Beulich
2014-10-14 12:39 ` Andrii Tseglytskyi
2014-10-14 12:51 ` Stefano Stabellini
2014-10-14 12:58 ` Andrii Tseglytskyi
2014-10-14 13:00 ` Andrii Tseglytskyi
2014-10-14 13:05 ` Ian Campbell
2014-10-14 13:07 ` Andrii Tseglytskyi
2014-10-15 10:55 ` Stefano Stabellini
2014-10-15 11:17 ` Andrii Tseglytskyi
2014-10-15 12:34 ` Ian Campbell
2014-10-15 16:26 ` Jan Beulich
2014-10-10 15:19 ` Ian Campbell [this message]
2014-10-10 10:40 ` Jan Beulich
2014-10-09 6:13 ` Oleksandr Dmytryshyn
2014-10-07 14:19 ` [RFC PATCH 12/13] xen: arm: implement XEN_SYSCTL_cpufreq_op Oleksandr Dmytryshyn
2014-10-07 14:19 ` [RFC PATCH 13/13] xen/arm: enable cpufreq functionality for ARM Oleksandr Dmytryshyn
2014-10-07 14:34 ` [RFC PATCH 00/13] xen_cpufreq implementation in Xen hypervisor Jan Beulich
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