From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755484AbcGHPUT (ORCPT ); Fri, 8 Jul 2016 11:20:19 -0400 Received: from foss.arm.com ([217.140.101.70]:43638 "EHLO foss.arm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754831AbcGHPUN (ORCPT ); Fri, 8 Jul 2016 11:20:13 -0400 Subject: Re: [PATCH v8 0/6] ACPI / processor_idle: Add ACPI v6.0 LPI support To: Lorenzo Pieralisi References: <1467911451-24731-1-git-send-email-sudeep.holla@arm.com> <577F88C8.8010209@arm.com> <20160708144307.GH3784@red-moon> Cc: Sudeep Holla , "Rafael J. Wysocki" , ACPI List , "Rafael J . Wysocki" , Vikas Sajjan , Sunil , PrashanthPrakash , Al Stone , Ashwin Chaugule , Daniel Lezcano , LKML , ALKML From: Sudeep Holla Organization: ARM Message-ID: <577FC47D.4090801@arm.com> Date: Fri, 8 Jul 2016 16:19:25 +0100 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:38.0) Gecko/20100101 Thunderbird/38.8.0 MIME-Version: 1.0 In-Reply-To: <20160708144307.GH3784@red-moon> Content-Type: text/plain; charset=windows-1252; format=flowed Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 08/07/16 15:43, Lorenzo Pieralisi wrote: > On Fri, Jul 08, 2016 at 12:04:40PM +0100, Sudeep Holla wrote: >> >> >> On 07/07/16 22:02, Rafael J. Wysocki wrote: >>> On Thu, Jul 7, 2016 at 7:10 PM, Sudeep Holla wrote: >>>> ACPI 6.0 introduced LPI(Low Power Idle) states that provides an alternate >>>> method to describe processor idle states. It extends the specification >>>> to allow the expression of idle states like C-states selectable by the >>>> OSPM when a processor goes idle, but may affect more than one processor, >>>> and may affect other system components. >>>> >>>> LPI extensions leverages the processor container device(again introduced >>>> in ACPI 6.0) allowing to express which parts of the system are affected >>>> by a given LPI state. It defines the local power states for each node >>>> in a hierarchical processor topology. The OSPM can use _LPI object to >>>> select a local power state for each level of processor hierarchy in the >>>> system. They used to produce a composite power state request that is >>>> presented to the platform by the OSPM. >>>> >>>> Since multiple processors affect the idle state for any non-leaf hierarchy >>>> node, coordination of idle state requests between the processors is >>>> required. ACPI supports two different coordination schemes: Platform >>>> coordinated and OS initiated. >>>> >>>> This series aims at providing basic and initial support for platform >>>> coordinated LPI states. >>>> >>>> v7[7]->v8: >>>> - Replaced HAVE_GENERIC_CPUIDLE_ENTER with CPU_IDLE_ENTER_WRAPPED >>>> macro, which is more cleaner and definately less confusing :) >>>> (Thanks to Rafael for the suggestion) >>> >>> Patches [3-6/6] definitely look a lot cleaner to me now. :-) >>> >>> That said, the name of the macro I suggested was just an example, so >>> if people don't like this one, it'd be fine to change it as far as I'm >>> concerned. >>> >> >> I can think of addition to indicate it's pm notifiers wrapper. >> i.e. CPU_IDLE_ENTER_PM_NOTIFIERS_WRAPPED. Is it too long ? I am happy >> with the way it is too. > > CPU_PM_CPU_IDLE_ENTER() ? Anyway, that's really not a problem IMO, > it makes sense to at least mention CPU PM in it given that's what > the CPUIDLE enter function is wrapped within. > Looks even better IMO, Rafael if you have no objection, I will change to CPU_PM_CPU_IDLE_ENTER ? -- Regards, Sudeep