From nobody Sun Feb 8 05:23:48 2026 Received: from foss.arm.com (foss.arm.com [217.140.110.172]) by smtp.subspace.kernel.org (Postfix) with ESMTP id 5BAA8156249 for ; Tue, 9 Apr 2024 17:15:22 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=217.140.110.172 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1712682924; cv=none; b=UP8tBed0rXiLpEKgM4pwZQzTWu9+gGlUn9GcSCk5AfhBxeMNy2Pv5980qulaBphOHGSQ5Be/nzfLHbilCrvm1KD+NKcvfx4uk4oRDBi1XdardfadlDYpkD9d0MNMPF2u2A6GwZXFl+O1B92JSEASyjlhF/2HYWhi6/I8vvcuvxE= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1712682924; c=relaxed/simple; bh=HPvhrtsQGYLih6FNRMxLsaieI+vQf0NxSAsCdjwProI=; h=From:To:Cc:Subject:Date:Message-Id:MIME-Version; b=c/xTXkT3wwvU0DvVzRXNqDlXAPmU6/MBfCT95B8K+X6ABEW1WXhzW+kED1uyMkMHc02JQdX8KQ85iQoBpQl8c2X2FELGpF6hdQsLHpGXIMVR6+V1eNZ2Z23QmTfQjd9OTNtPNhl0H56EDunapVg6BPdSOutgF+RVLFis6jEOYEQ= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=arm.com; spf=pass smtp.mailfrom=arm.com; arc=none smtp.client-ip=217.140.110.172 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=arm.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=arm.com 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 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" 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 =3D cpumask_local_spread(0, dev_to_node(cmn->dev)); cmn->pmu =3D (struct pmu) { .module =3D THIS_MODULE, + .parent =3D cmn->dev, .attr_groups =3D arm_cmn_attr_groups, .capabilities =3D PERF_PMU_CAP_NO_EXCLUDE, .task_ctx_nr =3D perf_invalid_context, --=20 2.39.2.101.g768bb238c484.dirty