From nobody Fri Sep 19 06:58:52 2025 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 D3D6CC43217 for ; Mon, 28 Nov 2022 02:55:04 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229685AbiK1CzD (ORCPT ); Sun, 27 Nov 2022 21:55:03 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:54540 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229529AbiK1CzB (ORCPT ); Sun, 27 Nov 2022 21:55:01 -0500 Received: from foss.arm.com (foss.arm.com [217.140.110.172]) by lindbergh.monkeyblade.net (Postfix) with ESMTP id 5B01B2DFE; Sun, 27 Nov 2022 18:55:00 -0800 (PST) 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 93449D6E; Sun, 27 Nov 2022 18:55:06 -0800 (PST) Received: from a077893.blr.arm.com (unknown [10.162.40.16]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPA id 096A63F73D; Sun, 27 Nov 2022 18:54:56 -0800 (PST) From: Anshuman Khandual To: linux-arm-kernel@lists.infradead.org, will@kernel.org Cc: Anshuman Khandual , Arnaldo Carvalho de Melo , Mark Rutland , Catalin Marinas , linux-perf-users@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH] arm64/perf: Replace PMU version number '0' with ID_AA64DFR0_EL1_PMUVer_NI Date: Mon, 28 Nov 2022 08:24:49 +0530 Message-Id: <20221128025449.39085-1-anshuman.khandual@arm.com> X-Mailer: git-send-email 2.25.1 MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Type: text/plain; charset="utf-8" __armv8pmu_probe_pmu() returns if detected PMU is either not implemented or implementation defined. Extracted ID_AA64DFR0_EL1_PMUVer value, when PMU is not implemented is '0' which can be replaced with ID_AA64DFR0_EL1_PMUVer_NI defined as '0b0000'. Cc: Arnaldo Carvalho de Melo Cc: Mark Rutland Cc: Will Deacon Cc: Catalin Marinas Cc: linux-perf-users@vger.kernel.org Cc: linux-kernel@vger.kernel.org Cc: linux-arm-kernel@lists.infradead.org Signed-off-by: Anshuman Khandual Acked-by: Mark Rutland --- This applies on v6.1-rc6 arch/arm64/kernel/perf_event.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/arch/arm64/kernel/perf_event.c b/arch/arm64/kernel/perf_event.c index 85a3aaefc0fb..b638f584b4dd 100644 --- a/arch/arm64/kernel/perf_event.c +++ b/arch/arm64/kernel/perf_event.c @@ -1188,7 +1188,8 @@ static void __armv8pmu_probe_pmu(void *info) dfr0 =3D read_sysreg(id_aa64dfr0_el1); pmuver =3D cpuid_feature_extract_unsigned_field(dfr0, ID_AA64DFR0_EL1_PMUVer_SHIFT); - if (pmuver =3D=3D ID_AA64DFR0_EL1_PMUVer_IMP_DEF || pmuver =3D=3D 0) + if (pmuver =3D=3D ID_AA64DFR0_EL1_PMUVer_IMP_DEF || + pmuver =3D=3D ID_AA64DFR0_EL1_PMUVer_NI) return; =20 cpu_pmu->pmuver =3D pmuver; --=20 2.25.1