From nobody Tue Feb 10 04:56:10 2026 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 E96BFEB64DA for ; Mon, 10 Jul 2023 06:00:59 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229968AbjGJGA6 (ORCPT ); Mon, 10 Jul 2023 02:00:58 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:53028 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229792AbjGJGAz (ORCPT ); Mon, 10 Jul 2023 02:00:55 -0400 Received: from mx0b-0031df01.pphosted.com (mx0b-0031df01.pphosted.com [205.220.180.131]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 05008FD; Sun, 9 Jul 2023 23:00:53 -0700 (PDT) Received: from pps.filterd (m0279872.ppops.net [127.0.0.1]) by mx0a-0031df01.pphosted.com (8.17.1.19/8.17.1.19) with ESMTP id 36A4LYnW008582; Mon, 10 Jul 2023 06:00:24 GMT DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=quicinc.com; h=from : to : cc : subject : date : message-id : mime-version : content-type; s=qcppdkim1; bh=nMMlfpVJ+UOeVGD2dtc8/N7imAyEaUSCV1mdaihTP0w=; b=kuf+EpJI3guDerzZxYiBLNtWJ6EV1r7ARyQK4hUBX/J4h+kuLcYVBXG/Cw0dUS/+MAX9 ERZFxgaLjKM7Cp8DpmPjfPP2VWa3FICeYbgC9mQZN6BSTiTy3wljZzms3toxyTfF2o+n p6ERbqrivHOMlz19JxfrtdAZRuOdyiQLTxLtt6o53BMVx1lDf9IPQBSVKGZPJb2bV4BB HvH9CVtcbiQreA+EaG0EiicU3znGLXtpn6c6xixulhK93w+v65mrmwxDs2X9XnIHdjYy vx1Ws2SjjIIB0xOLwyBXkZlKwatX4i78OSvvh55OQiz/4OP0ufL/JoOxcMQkMAoVO+p/ fw== Received: from nasanppmta04.qualcomm.com (i-global254.qualcomm.com [199.106.103.254]) by mx0a-0031df01.pphosted.com (PPS) with ESMTPS id 3rq06d2k7t-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Mon, 10 Jul 2023 06:00:23 +0000 Received: from nasanex01a.na.qualcomm.com (nasanex01a.na.qualcomm.com [10.52.223.231]) by NASANPPMTA04.qualcomm.com (8.17.1.5/8.17.1.5) with ESMTPS id 36A60M2D027122 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Mon, 10 Jul 2023 06:00:22 GMT Received: from aiquny2-gv.qualcomm.com (10.80.80.8) by nasanex01a.na.qualcomm.com (10.52.223.231) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.1118.30; Sun, 9 Jul 2023 23:00:19 -0700 From: Maria Yu To: , , CC: , , , , , , , , , Maria Yu Subject: [PATCH] arm64: Add the arm64.nolse_atomics command line option Date: Mon, 10 Jul 2023 13:59:55 +0800 Message-ID: <20230710055955.36551-1-quic_aiquny@quicinc.com> X-Mailer: git-send-email 2.17.1 MIME-Version: 1.0 X-Originating-IP: [10.80.80.8] X-ClientProxiedBy: nasanex01a.na.qualcomm.com (10.52.223.231) To nasanex01a.na.qualcomm.com (10.52.223.231) X-QCInternal: smtphost X-Proofpoint-Virus-Version: vendor=nai engine=6200 definitions=5800 signatures=585085 X-Proofpoint-ORIG-GUID: m3sXGeh0TbaOb70k3S1OMxS1nxYXB0t8 X-Proofpoint-GUID: m3sXGeh0TbaOb70k3S1OMxS1nxYXB0t8 X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.254,Aquarius:18.0.957,Hydra:6.0.591,FMLib:17.11.176.26 definitions=2023-07-10_04,2023-07-06_02,2023-05-22_02 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 malwarescore=0 adultscore=0 spamscore=0 lowpriorityscore=0 clxscore=1011 impostorscore=0 mlxscore=0 phishscore=0 priorityscore=1501 suspectscore=0 mlxlogscore=911 bulkscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2305260000 definitions=main-2307100054 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" In order to be able to disable lse_atomic even if cpu support it, most likely because of memory controller cannot deal with the lse atomic instructions, use a new idreg override to deal with it. Signed-off-by: Maria Yu --- Documentation/admin-guide/kernel-parameters.txt | 2 ++ arch/arm64/include/asm/cpufeature.h | 1 + arch/arm64/kernel/cpufeature.c | 4 +++- arch/arm64/kernel/idreg-override.c | 11 +++++++++++ 4 files changed, 17 insertions(+), 1 deletion(-) diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentatio= n/admin-guide/kernel-parameters.txt index 85fb0fa5d091..6ad754549f1d 100644 --- a/Documentation/admin-guide/kernel-parameters.txt +++ b/Documentation/admin-guide/kernel-parameters.txt @@ -433,6 +433,8 @@ arm64.nomops [ARM64] Unconditionally disable Memory Copy and Memory Set instructions support =20 + arm64.nolse_atomic [ARM64] Unconditionally disable LSE Atomic support + ataflop=3D [HW,M68k] =20 atarimouse=3D [HW,MOUSE] Atari Mouse diff --git a/arch/arm64/include/asm/cpufeature.h b/arch/arm64/include/asm/c= pufeature.h index 96e50227f940..9d56dea1fe62 100644 --- a/arch/arm64/include/asm/cpufeature.h +++ b/arch/arm64/include/asm/cpufeature.h @@ -916,6 +916,7 @@ extern struct arm64_ftr_override id_aa64pfr0_override; extern struct arm64_ftr_override id_aa64pfr1_override; extern struct arm64_ftr_override id_aa64zfr0_override; extern struct arm64_ftr_override id_aa64smfr0_override; +extern struct arm64_ftr_override id_aa64isar0_override; extern struct arm64_ftr_override id_aa64isar1_override; extern struct arm64_ftr_override id_aa64isar2_override; =20 diff --git a/arch/arm64/kernel/cpufeature.c b/arch/arm64/kernel/cpufeature.c index f9d456fe132d..9bd766880807 100644 --- a/arch/arm64/kernel/cpufeature.c +++ b/arch/arm64/kernel/cpufeature.c @@ -669,6 +669,7 @@ struct arm64_ftr_override __ro_after_init id_aa64pfr0_o= verride; struct arm64_ftr_override __ro_after_init id_aa64pfr1_override; struct arm64_ftr_override __ro_after_init id_aa64zfr0_override; struct arm64_ftr_override __ro_after_init id_aa64smfr0_override; +struct arm64_ftr_override __ro_after_init id_aa64isar0_override; struct arm64_ftr_override __ro_after_init id_aa64isar1_override; struct arm64_ftr_override __ro_after_init id_aa64isar2_override; =20 @@ -721,7 +722,8 @@ static const struct __ftr_reg_entry { ARM64_FTR_REG(SYS_ID_AA64DFR1_EL1, ftr_raz), =20 /* Op1 =3D 0, CRn =3D 0, CRm =3D 6 */ - ARM64_FTR_REG(SYS_ID_AA64ISAR0_EL1, ftr_id_aa64isar0), + ARM64_FTR_REG_OVERRIDE(SYS_ID_AA64ISAR0_EL1, ftr_id_aa64isar0, + &id_aa64isar0_override), ARM64_FTR_REG_OVERRIDE(SYS_ID_AA64ISAR1_EL1, ftr_id_aa64isar1, &id_aa64isar1_override), ARM64_FTR_REG_OVERRIDE(SYS_ID_AA64ISAR2_EL1, ftr_id_aa64isar2, diff --git a/arch/arm64/kernel/idreg-override.c b/arch/arm64/kernel/idreg-o= verride.c index 2fe2491b692c..af41ab4f3d94 100644 --- a/arch/arm64/kernel/idreg-override.c +++ b/arch/arm64/kernel/idreg-override.c @@ -105,6 +105,15 @@ static const struct ftr_set_desc pfr1 __initconst =3D { }, }; =20 +static const struct ftr_set_desc isar0 __initconst =3D { + .name =3D "id_aa64isar0", + .override =3D &id_aa64isar0_override, + .fields =3D { + FIELD("atomic", ID_AA64ISAR0_EL1_ATOMIC_SHIFT, NULL), + {} + }, +}; + static const struct ftr_set_desc isar1 __initconst =3D { .name =3D "id_aa64isar1", .override =3D &id_aa64isar1_override, @@ -163,6 +172,7 @@ static const struct ftr_set_desc * const regs[] __initc= onst =3D { &mmfr1, &pfr0, &pfr1, + &isar0, &isar1, &isar2, &smfr0, @@ -185,6 +195,7 @@ static const struct { { "arm64.nomops", "id_aa64isar2.mops=3D0" }, { "arm64.nomte", "id_aa64pfr1.mte=3D0" }, { "nokaslr", "arm64_sw.nokaslr=3D1" }, + { "arm64.nolse_atomic", "id_aa64isar0.atomic=3D0" }, }; =20 static int __init parse_nokaslr(char *unused) --=20 2.17.1