From patchwork Thu Mar 30 16:45:53 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jonathan Cameron X-Patchwork-Id: 13194589 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 vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id EF1D6C77B73 for ; Thu, 30 Mar 2023 16:47:50 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232391AbjC3QrW (ORCPT ); Thu, 30 Mar 2023 12:47:22 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:53146 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232274AbjC3Qqx (ORCPT ); Thu, 30 Mar 2023 12:46:53 -0400 Received: from frasgout.his.huawei.com (frasgout.his.huawei.com [185.176.79.56]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 7F5A3CC3E; Thu, 30 Mar 2023 09:46:52 -0700 (PDT) Received: from lhrpeml500005.china.huawei.com (unknown [172.18.147.201]) by frasgout.his.huawei.com (SkyGuard) with ESMTP id 4PnTnv3bXnz6J7n2; Fri, 31 Mar 2023 00:46:11 +0800 (CST) Received: from SecurePC-101-06.china.huawei.com (10.122.247.231) by lhrpeml500005.china.huawei.com (7.191.163.240) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2507.21; Thu, 30 Mar 2023 17:46:49 +0100 From: Jonathan Cameron To: Liang Kan , , CC: , , , , , , , , Davidlohr Bueso , Dave Jiang Subject: [PATCH v4 2/5] perf: Allow a PMU to have a parent Date: Thu, 30 Mar 2023 17:45:53 +0100 Message-ID: <20230330164556.31533-3-Jonathan.Cameron@huawei.com> X-Mailer: git-send-email 2.37.2 In-Reply-To: <20230330164556.31533-1-Jonathan.Cameron@huawei.com> References: <20230330164556.31533-1-Jonathan.Cameron@huawei.com> MIME-Version: 1.0 X-Originating-IP: [10.122.247.231] X-ClientProxiedBy: lhrpeml100001.china.huawei.com (7.191.160.183) To lhrpeml500005.china.huawei.com (7.191.163.240) X-CFilter-Loop: Reflected Precedence: bulk List-ID: X-Mailing-List: linux-cxl@vger.kernel.org Some PMUs have well defined parents such as PCI devices. As the device_initialize() and device_add() are all within pmu_dev_alloc() which is called from perf_pmu_register() there is no opportunity to set the parent from within a driver. Add a struct device *parent field to struct pmu and use that to set the parent. Signed-off-by: Jonathan Cameron Reviewed-by: Dan Williams --- v4: No change Note that this may first merge as part of a larger series I plan to post next week that adds parents for many of the of the other struct pmu instances. If so please drop this patch whilst applying. --- include/linux/perf_event.h | 1 + kernel/events/core.c | 1 + 2 files changed, 2 insertions(+) diff --git a/include/linux/perf_event.h b/include/linux/perf_event.h index d5628a7b5eaa..b99db1eda72c 100644 --- a/include/linux/perf_event.h +++ b/include/linux/perf_event.h @@ -303,6 +303,7 @@ struct pmu { struct module *module; struct device *dev; + struct device *parent; const struct attribute_group **attr_groups; const struct attribute_group **attr_update; const char *name; diff --git a/kernel/events/core.c b/kernel/events/core.c index fb3e436bcd4a..a84c282221f2 100644 --- a/kernel/events/core.c +++ b/kernel/events/core.c @@ -11367,6 +11367,7 @@ static int pmu_dev_alloc(struct pmu *pmu) dev_set_drvdata(pmu->dev, pmu); pmu->dev->bus = &pmu_bus; + pmu->dev->parent = pmu->parent; pmu->dev->release = pmu_dev_release; ret = dev_set_name(pmu->dev, "%s", pmu->name);