From: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To: Tomeu Vizoso <tomeu.vizoso@collabora.com>
Cc: "Rafael J. Wysocki" <rjw@rjwysocki.net>,
Linux PM list <linux-pm@vger.kernel.org>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
Alan Stern <stern@rowland.harvard.edu>,
Grant Likely <grant.likely@linaro.org>,
Mark Brown <broonie@kernel.og>, Rob Herring <robh@kernel.org>,
Thierry Reding <treding@nvidia.com>,
Dmitry Torokhov <dtor@google.com>,
Geert Uytterhoeven <geert@linux-m68k.org>,
Michael Turquette <mturquette@baylibre.com>
Subject: Re: [RFD] Functional dependencies between devices
Date: Fri, 8 Jan 2016 07:15:29 -0800 [thread overview]
Message-ID: <20160108151529.GA18036@kroah.com> (raw)
In-Reply-To: <CAAObsKDZ07i-gMiGr2t1+H2k80n+=r0mKbavt5-ZhMmqxT1WaA@mail.gmail.com>
On Fri, Jan 08, 2016 at 08:28:15AM +0100, Tomeu Vizoso wrote:
> On 7 January 2016 at 22:29, Greg Kroah-Hartman
> <gregkh@linuxfoundation.org> wrote:
> > On Thu, Jan 07, 2016 at 03:55:43PM +0100, Tomeu Vizoso wrote:
> >> On 30 October 2015 at 23:52, Greg Kroah-Hartman
> >> <gregkh@linuxfoundation.org> wrote:
> >> > On Tue, Oct 27, 2015 at 04:24:14PM +0100, Rafael J. Wysocki wrote:
> >> >> My idea is to represent a supplier-consumer dependency between devices (or
> >> >> more precisely between device+driver combos) as a "link" object containing
> >> >> pointers to the devices in question, a list node for each of them and some
> >> >> additional information related to the management of those objects, ie.
> >> >> something like:
> >> >>
> >> >> struct device_link {
> >> >> struct device *supplier;
> >> >> struct list_head supplier_node;
> >> >> struct device *consumer;
> >> >> struct list_head consumer_node;
> >> >> <flags, status etc>
> >> >> };
> >> >>
> >> >> In general, there will be two lists of those things per device, one list
> >> >> of links to consumers and one list of links to suppliers.
> >> >>
> >> >> In that picture, links will be created by calling, say:
> >> >>
> >> >> int device_add_link(struct device *me, struct device *my_supplier, unsigned int flags);
> >> >
> >> > At first glance, I like this, nice. Now to see how well it can be
> >> > implemented :)
> >>
> >> Hi Greg,
> >>
> >> what's your opinion on using this to order device probes so we don't
> >> try to probe a device that we know it has unfulfilled dependencies?
> >
> > Why would that matter, unless you can prove it's faster, I wouldn't
> > bother.
>
> I gave you the bootlog you asked in the post below, could you please
> comment there?
>
> https://lkml.kernel.org/g/562A280A.3040002@collabora.com
that made no sense at all...
next prev parent reply other threads:[~2016-01-08 15:15 UTC|newest]
Thread overview: 55+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-10-27 15:24 [RFD] Functional dependencies between devices Rafael J. Wysocki
2015-10-27 15:20 ` Tomeu Vizoso
2015-10-28 2:15 ` Rafael J. Wysocki
2015-10-28 14:26 ` Tomeu Vizoso
2015-10-28 15:54 ` Rafael J. Wysocki
2015-10-29 0:18 ` Mark Brown
2015-10-29 14:03 ` Tomeu Vizoso
2015-10-29 14:31 ` Alan Stern
2015-10-31 2:23 ` Rafael J. Wysocki
2015-10-31 15:22 ` Alan Stern
2015-10-29 0:15 ` Mark Brown
2015-10-31 2:13 ` Rafael J. Wysocki
2015-10-31 2:40 ` Mark Brown
2015-10-30 9:50 ` Linus Walleij
2015-10-30 22:52 ` Greg Kroah-Hartman
2016-01-07 14:55 ` Tomeu Vizoso
2016-01-07 21:29 ` Greg Kroah-Hartman
2016-01-08 7:28 ` Tomeu Vizoso
2016-01-08 15:15 ` Greg Kroah-Hartman [this message]
2015-11-09 12:32 ` Thierry Reding
2015-11-09 21:42 ` Rafael J. Wysocki
2015-11-17 12:44 ` Andrzej Hajda
2015-11-18 2:17 ` Rafael J. Wysocki
2015-11-19 9:08 ` Andrzej Hajda
2015-11-19 22:04 ` Rafael J. Wysocki
2015-11-20 1:11 ` Rafael J. Wysocki
2015-11-24 14:57 ` Andrzej Hajda
2015-11-24 16:28 ` Rafael J. Wysocki
2015-11-30 7:16 ` Andrzej Hajda
2015-11-17 12:49 ` Andrzej Hajda
2015-11-17 13:55 ` Mark Brown
2015-11-19 6:50 ` Andrzej Hajda
2015-11-21 14:04 ` Mark Brown
2015-11-24 13:56 ` Andrzej Hajda
2015-11-19 13:18 ` Thierry Reding
2015-11-21 13:26 ` Mark Brown
2015-11-17 20:31 ` Alan Stern
2015-11-17 22:47 ` Mark Brown
2016-01-14 1:52 ` [RFC][PATCH 0/5] " Rafael J. Wysocki
2016-01-14 1:53 ` [RFC][PATCH 1/5] driver core: Add a wrapper around __device_release_driver() Rafael J. Wysocki
2016-01-14 1:54 ` [RFC][PATCH 2/5] driver core: Functional dependencies tracking support Rafael J. Wysocki
2016-06-08 12:48 ` Mark Brown
2016-06-08 18:12 ` Rafael J. Wysocki
2016-06-08 18:35 ` Mark Brown
2016-06-08 20:48 ` Rafael J. Wysocki
2016-06-08 22:24 ` Mark Brown
2016-01-14 1:55 ` [RFC][PATCH 3/5] PM core: Make async suspend/resume of devices use device links Rafael J. Wysocki
2016-06-08 12:59 ` Mark Brown
2016-01-14 1:56 ` [RFC][PATCH 4/5] PM core: Make runtime PM " Rafael J. Wysocki
2016-01-14 1:56 ` [RFC][PATCH 5/5] PM core: Optimize the use of device links for runtime PM Rafael J. Wysocki
2016-01-14 14:19 ` [RFC][PATCH 0/5] Functional dependencies between devices Tomeu Vizoso
2016-01-15 0:44 ` Rafael J. Wysocki
2016-06-08 12:15 ` Mark Brown
2016-06-08 17:24 ` Rafael J. Wysocki
2016-06-08 17:33 ` Mark Brown
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