From patchwork Tue Apr 9 17:15:17 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Robin Murphy X-Patchwork-Id: 13622983 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 F312AC67861 for ; Tue, 9 Apr 2024 17:15:35 +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:MIME-Version:Message-Id:Date:Subject:Cc :To:From:Reply-To:Content-ID:Content-Description:Resent-Date:Resent-From: Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:In-Reply-To:References: List-Owner; bh=I44lV8l2OER4UxmrQcxGZov24wWsUMD/wRV1cqpZ3pA=; b=Wv6oLs8zdf1+BL pTDXtoo1YRVNwJl4vP/gj6odcz5LDLrv9xkn6DYUWVm2rUJxYxR6ZiK7Lbzaj4qIcjhR7DlBGSl0V HAKXdridslbRvPihSh14ry9dfmFDVUIhDkeZonN1RqajwbePzDdnCVRinGrfCzJ6WcldB/uHQk4z9 g3+VgdRnfNlSuIywzKTZMO1sH7jHKzhws/251Lguf1VGUe8huYGGm9aKmAkakkj41iRN4nmIC8/zn lzA0HIUxCmPGOB1qlEsbu4dB8DsqaOMcItsRooqX2Q6frdJ2K31EMA1Cj57iCDbMngfmPm0S1Ga1I NyLVaS6CvWh1kH1iwA4A==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.97.1 #2 (Red Hat Linux)) id 1ruF4A-000000036xy-3G3h; Tue, 09 Apr 2024 17:15:26 +0000 Received: from foss.arm.com ([217.140.110.172]) by bombadil.infradead.org with esmtp (Exim 4.97.1 #2 (Red Hat Linux)) id 1ruF46-000000036vQ-2Avo for linux-arm-kernel@lists.infradead.org; Tue, 09 Apr 2024 17:15:24 +0000 Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.121.207.14]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id CC9F0139F; Tue, 9 Apr 2024 10:15:51 -0700 (PDT) Received: from e121345-lin.cambridge.arm.com (e121345-lin.cambridge.arm.com [10.1.196.40]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPA id 0A74B3F6C4; Tue, 9 Apr 2024 10:15:20 -0700 (PDT) From: Robin Murphy To: will@kernel.org, mark.rutland@arm.com Cc: linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org Subject: [PATCH] perf/arm-cmn: Set PMU device parent Date: Tue, 9 Apr 2024 18:15:17 +0100 Message-Id: <25d4428df1ddad966c74a3ed60171cd3ca6c8b66.1712682917.git.robin.murphy@arm.com> X-Mailer: git-send-email 2.39.2.101.g768bb238c484.dirty MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20240409_101522_811585_A94BB55C X-CRM114-Status: UNSURE ( 9.32 ) X-CRM114-Notice: Please train this message. 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: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org Now that perf supports giving the PMU device a parent, we can use our platform device to make the relationship between CMN instances and PMU IDs trivially discoverable, from either nominal direction: root@crazy-taxi:~# ls /sys/devices/platform/ARMHC600:00 | grep cmn arm_cmn_0 root@crazy-taxi:~# realpath /sys/bus/event_source/devices/arm_cmn_0/.. /sys/devices/platform/ARMHC600:00 Signed-off-by: Robin Murphy --- drivers/perf/arm-cmn.c | 1 + 1 file changed, 1 insertion(+) diff --git a/drivers/perf/arm-cmn.c b/drivers/perf/arm-cmn.c index 7ef9c7e4836b..b2c607cf3ad7 100644 --- a/drivers/perf/arm-cmn.c +++ b/drivers/perf/arm-cmn.c @@ -2482,6 +2482,7 @@ static int arm_cmn_probe(struct platform_device *pdev) cmn->cpu = cpumask_local_spread(0, dev_to_node(cmn->dev)); cmn->pmu = (struct pmu) { .module = THIS_MODULE, + .parent = cmn->dev, .attr_groups = arm_cmn_attr_groups, .capabilities = PERF_PMU_CAP_NO_EXCLUDE, .task_ctx_nr = perf_invalid_context,