Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753346AbaJTJl2 (ORCPT ); Mon, 20 Oct 2014 05:41:28 -0400 Received: from mail-lb0-f182.google.com ([209.85.217.182]:35033 "EHLO mail-lb0-f182.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752959AbaJTJlY (ORCPT ); Mon, 20 Oct 2014 05:41:24 -0400 MIME-Version: 1.0 In-Reply-To: <20141020092005.GD4370@arm.com> References: <6106CAF835F351419ADA79E4836E6EC71B6A53C826@SC-VEXCH4.marvell.com> <9034CBD80F070943B59700D7F8149ED9A0875730@SC-VEXCH4.marvell.com> <20140513184503.GF16388@arm.com> <9034CBD80F070943B59700D7F8149ED9A087573F@SC-VEXCH4.marvell.com> <537337F3.4080300@arm.com> <9034CBD80F070943B59700D7F8149ED9A0875776@SC-VEXCH4.marvell.com> <9034CBD80F070943B59700D7F8149ED90182308172@SC-VEXCH4.marvell.com> <20140703175706.GI17372@arm.com> <9034CBD80F070943B59700D7F8149ED9024EB81CD8@SC-VEXCH4.marvell.com> <5444D2E0.9070205@arm.com> <20141020092005.GD4370@arm.com> Date: Mon, 20 Oct 2014 11:41:22 +0200 X-Google-Sender-Auth: z3rwWcPDdI7TXl1oWlUnc6kXq-Y Message-ID: Subject: Re: [PATCH v4] ARM: perf: save/restore pmu registers in pm notifier From: Geert Uytterhoeven To: Will Deacon Cc: Sudeep Holla , Neil Zhang , "linux@arm.linux.org.uk" , "linux-arm-kernel@lists.infradead.org" , "linux-kernel@vger.kernel.org" , "devicetree@vger.kernel.org" , Mathieu Poirier Content-Type: text/plain; charset=UTF-8 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Mon, Oct 20, 2014 at 11:20 AM, Will Deacon wrote: > On Mon, Oct 20, 2014 at 10:16:16AM +0100, Sudeep Holla wrote: >> On 20/10/14 09:46, Neil Zhang wrote: >> > Will, I prefer to check always-on field under PMU node to check >> > whether we need Save/restore them. >> > >> But how do you handle it for different idle states. e.g. if CPU is in >> retention, PMU's *might be* retained. Also I don't think PMUs will be >> placed in "always-on" power domain like timers. So using "always-on" >> sounds incorrect to me. > > Adding Mathieu to CC, since I spoke to him at LPC about this and he was > talking about implementing proper PM domain descriptions for coresight > components. Good to hear that! Gr{oetje,eeting}s, Geert (who skipped LPC) -- Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org In personal conversations with technical people, I call myself a hacker. But when I'm talking to journalists I just say "programmer" or something like that. -- Linus Torvalds -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/