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 X-Spam-Level: X-Spam-Status: No, score=-18.8 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER,INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, URIBL_BLOCKED,USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 449BCC4332E for ; Tue, 2 Mar 2021 04:43:57 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 07FD360200 for ; Tue, 2 Mar 2021 04:43:56 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1443182AbhCBCTZ (ORCPT ); Mon, 1 Mar 2021 21:19:25 -0500 Received: from mail.kernel.org ([198.145.29.99]:55186 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S235786AbhCATpa (ORCPT ); Mon, 1 Mar 2021 14:45:30 -0500 Received: by mail.kernel.org (Postfix) with ESMTPSA id 5ED9D650D3; Mon, 1 Mar 2021 17:46:02 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1614620763; bh=ELZikx7g3N74HYqa74de0f9j+RRsCSv1vYuRnXBIa+U=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=M+HTizxLMkX5Z6MfIYufmRXegaRruk2zTZIrIjxbxEmjZs2vIWUiSb0KtsXk8G2hI HWtbnoyvskmVTGtp3wFde6yJOuuw6BVuNUzoIi9epReYE/LjP5lD8XmuaHHhIf+ecF PoVJ3Uca/SnN8mD9LfMhvAJEJk5HcMMk6DsupWw0= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Robin Murphy , Will Deacon , Sasha Levin Subject: [PATCH 5.11 240/775] perf/arm-cmn: Fix PMU instance naming Date: Mon, 1 Mar 2021 17:06:48 +0100 Message-Id: <20210301161213.491982586@linuxfoundation.org> X-Mailer: git-send-email 2.30.1 In-Reply-To: <20210301161201.679371205@linuxfoundation.org> References: <20210301161201.679371205@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Robin Murphy [ Upstream commit 79d7c3dca99fa96033695ddf5d495b775a3a137b ] Although it's neat to avoid the suffix for the typical case of a single PMU, it means systems with multiple CMN instances end up with inconsistent naming. I think it also breaks perf tool's "uncore alias" logic if the common instance prefix is also the full name of one. Avoid any surprises by not trying to be clever and simply numbering every instance, even when it might technically prove redundant. Fixes: 0ba64770a2f2 ("perf: Add Arm CMN-600 PMU driver") Signed-off-by: Robin Murphy Link: https://lore.kernel.org/r/649a2281233f193d59240b13ed91b57337c77b32.1611839564.git.robin.murphy@arm.com Signed-off-by: Will Deacon Signed-off-by: Sasha Levin --- Documentation/admin-guide/perf/arm-cmn.rst | 2 +- drivers/perf/arm-cmn.c | 13 ++++--------- 2 files changed, 5 insertions(+), 10 deletions(-) diff --git a/Documentation/admin-guide/perf/arm-cmn.rst b/Documentation/admin-guide/perf/arm-cmn.rst index 0e48093460140..796e25b7027b2 100644 --- a/Documentation/admin-guide/perf/arm-cmn.rst +++ b/Documentation/admin-guide/perf/arm-cmn.rst @@ -17,7 +17,7 @@ PMU events ---------- The PMU driver registers a single PMU device for the whole interconnect, -see /sys/bus/event_source/devices/arm_cmn. Multi-chip systems may link +see /sys/bus/event_source/devices/arm_cmn_0. Multi-chip systems may link more than one CMN together via external CCIX links - in this situation, each mesh counts its own events entirely independently, and additional PMU devices will be named arm_cmn_{1..n}. diff --git a/drivers/perf/arm-cmn.c b/drivers/perf/arm-cmn.c index a76ff594f3ca4..f3071b5ddaaef 100644 --- a/drivers/perf/arm-cmn.c +++ b/drivers/perf/arm-cmn.c @@ -1502,7 +1502,7 @@ static int arm_cmn_probe(struct platform_device *pdev) struct arm_cmn *cmn; const char *name; static atomic_t id; - int err, rootnode, this_id; + int err, rootnode; cmn = devm_kzalloc(&pdev->dev, sizeof(*cmn), GFP_KERNEL); if (!cmn) @@ -1549,14 +1549,9 @@ static int arm_cmn_probe(struct platform_device *pdev) .cancel_txn = arm_cmn_end_txn, }; - this_id = atomic_fetch_inc(&id); - if (this_id == 0) { - name = "arm_cmn"; - } else { - name = devm_kasprintf(cmn->dev, GFP_KERNEL, "arm_cmn_%d", this_id); - if (!name) - return -ENOMEM; - } + name = devm_kasprintf(cmn->dev, GFP_KERNEL, "arm_cmn_%d", atomic_fetch_inc(&id)); + if (!name) + return -ENOMEM; err = cpuhp_state_add_instance(arm_cmn_hp_state, &cmn->cpuhp_node); if (err) -- 2.27.0