From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 81955C433EF for ; Tue, 10 May 2022 11:15:12 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:In-Reply-To:MIME-Version:References: Message-ID:Subject:Cc:To:From:Date:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=UZgWeg63Y3Xoqi6JrzP9y9ypUIzF5WrBEMC2ulwcgE0=; b=qD/bvP1NVNAh2y L9z7GR9rhu0jKwAQ8tepSVhLSkmd0hToc0F7y9OQpR0vGblSnfJ3vaICjfdOX+r18qdlWm6xDQmss hd3smY6WQiPKpO5ywTDg3hu610OloSINlmZxkGhRARaP3o/J86VFfL9f01gOxklZxuiHjIF6FEpVf ejqHPokTD4ODHY6KxgiJ1/7+mo4Rfi+gKYRgVIIavuz/lYclhfAfabDMKPuQq4HbYDiPfBD7o9JTO 4ythW5xsEOARQBhCzGaj06ciWtHG4rYhwF1Er5sj8so5EPoMDvVNhQ1JkLA1UEOv+vneGJoRUsACb YuSjJHA//qGkzBBqWxng==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.94.2 #2 (Red Hat Linux)) id 1noNob-001SQ6-2A; Tue, 10 May 2022 11:14:05 +0000 Received: from ams.source.kernel.org ([145.40.68.75]) by bombadil.infradead.org with esmtps (Exim 4.94.2 #2 (Red Hat Linux)) id 1noNo2-001SCI-Jo for linux-arm-kernel@lists.infradead.org; Tue, 10 May 2022 11:13:32 +0000 Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ams.source.kernel.org (Postfix) with ESMTPS id 55F58B81CBC; Tue, 10 May 2022 11:13:27 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 3CB68C385C2; Tue, 10 May 2022 11:13:23 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1652181205; bh=WNU4ksjN/LVTrVzbET1InUKC36Ei8bhbRLGGDvnxB/4=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=eKuwKInN6cyg3p8dTsDyoNtNUIAwmO24ivvGGZ0aZ5d+HUIhatW76h6J/wOrLIaA6 zmHRyIkMg8GIzh2IF05y8JetF0nEHbT6y4it+zGUrRjfsOC8nKvC0MaEeNJtjXuTLv suErUe8cBgwAmPH23mzDcO1w5nUumSj7FNUzajxecqbmGZzv1FB6cYi+TQBSh7pVkQ ifnw+3pNGC4dXmtlirlECzCy7L7cLWiwFhvSnaLaE8tZnDItFrFOgiPBdHyyqM+/ds zpJmcQ5iMmtdY+Id2qwqbF/fcKTXRpDUjmjM3VlORmglIBCLcoSSqBKRKWtddJw2wC QLKl1nqC6JZBw== Date: Tue, 10 May 2022 12:13:19 +0100 From: Will Deacon To: Sudeep Holla Cc: Suzuki K Poulose , Besar Wicaksono , catalin.marinas@arm.com, mark.rutland@arm.com, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, linux-tegra@vger.kernel.org, thanu.rangarajan@arm.com, Michael.Williams@arm.com, treding@nvidia.com, jonathanh@nvidia.com, vsethi@nvidia.com, Mathieu Poirier Subject: Re: [PATCH 0/2] perf: ARM CoreSight PMU support Message-ID: <20220510111318.GD27557@willie-the-truck> References: <20220509002810.12412-1-bwicaksono@nvidia.com> <20220509092843.GB26264@willie-the-truck> <2e5e09f9-b71b-d936-e291-db8f94554b18@arm.com> <20220510110742.ievkihggndpms3fn@bogus> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <20220510110742.ievkihggndpms3fn@bogus> User-Agent: Mutt/1.10.1 (2018-07-13) X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20220510_041331_015625_38E8C683 X-CRM114-Status: GOOD ( 26.68 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On Tue, May 10, 2022 at 12:07:42PM +0100, Sudeep Holla wrote: > On Mon, May 09, 2022 at 11:02:23AM +0100, Suzuki K Poulose wrote: > > Cc: Mike Williams, Mathieu Poirier > > On 09/05/2022 10:28, Will Deacon wrote: > > > On Sun, May 08, 2022 at 07:28:08PM -0500, Besar Wicaksono wrote: > > > > arch/arm64/configs/defconfig | 1 + > > > > drivers/perf/Kconfig | 2 + > > > > drivers/perf/Makefile | 1 + > > > > drivers/perf/coresight_pmu/Kconfig | 10 + > > > > drivers/perf/coresight_pmu/Makefile | 7 + > > > > .../perf/coresight_pmu/arm_coresight_pmu.c | 1317 +++++++++++++++++ > > > > .../perf/coresight_pmu/arm_coresight_pmu.h | 147 ++ > > > > .../coresight_pmu/arm_coresight_pmu_nvidia.c | 300 ++++ > > > > .../coresight_pmu/arm_coresight_pmu_nvidia.h | 17 + > > > > 9 files changed, 1802 insertions(+) > > > > > > How does this interact with all the stuff we have under > > > drivers/hwtracing/coresight/? > > > > Absolutely zero, except for the name. The standard > > is named "CoreSight PMU" which is a bit unfortunate, > > given the only link, AFAIU, with the "CoreSight" architecture > > is the Lock Access Register(LAR). For reference, the > > drivers/hwtracing/coresight/ is purely "CoreSight" self-hosted > > tracing and the PMU is called "cs_etm" (expands to coresight etm). > > Otherwise the standard doesn't have anything to do with what > > exists already in the kernel. That's... a poor naming choice! But good, if it's entirely separate then I don't have to worry about that. Just wanted to make sure we're not going to get tangled up in things like ROM tables and Coresight power domains for these things. > > One potential recommendation for the name is, "Arm PMU" (The ACPI table is > > named Arm PMU Table). But then that could be clashing with the armv8_pmu > > :-(. > > > > Some of the other options are : > > > > "Arm Generic PMU" > > "Arm Uncore PMU" > > I wasn't sure on this if there is any restriction on usage of this on Arm > and hence didn't make the suggestion. But if allowed, this would be my > choice too. We'd taken to calling them "System" PMUS in the past, so maybe just stick with that? I think "Uncore" is Intel terminology so it's probably best to avoid it for non-Intel parts. Will _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel