From patchwork Thu Nov 7 19:08:18 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Ankur Arora X-Patchwork-Id: 13866941 Received: from mx0b-00069f02.pphosted.com (mx0b-00069f02.pphosted.com [205.220.177.32]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 00C5F21F4D9; Thu, 7 Nov 2024 19:09:47 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=fail smtp.client-ip=205.220.177.32 ARC-Seal: i=2; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1731006589; cv=fail; b=Psfac6ZbxP26XP3W+fHI32GHLrFLRfppFh8kH7F2R2PrKsTGs13wcxSmQtLNb0gQH76na2ou9nkTib15uP0PSOcG/jh1610UxVGZzwyz3TrUVkTYNTiSaQUxphJel/9HYx+gkYsNU0lwp/Wk1v6A+ggWwIWD80YaiNpuvzPFWrg= ARC-Message-Signature: i=2; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1731006589; c=relaxed/simple; bh=MY1WUyiG3MlGsF9zGtV+TOUyfeJkWNCFZTQDiZEjs58=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: Content-Type:MIME-Version; b=gGP73ZEbG+hjCBw9GcBA1o9HdRNLB7oJU6kjzPgSsXP1RrxcWB3Pm1mn3edxc2nYp8mcUunxFQFgAL73RBJ0MWMNrmbp7Vb6/34kDBXj7Gy/4aySPiCvFLgds6px22aYLrhp/OS2MBwSWpRrdNgV2C7noUxUSvGSMDYVjcEojhc= ARC-Authentication-Results: i=2; smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=oracle.com; spf=pass smtp.mailfrom=oracle.com; dkim=pass (2048-bit key) header.d=oracle.com header.i=@oracle.com header.b=ak8pQiLu; dkim=pass (1024-bit key) header.d=oracle.onmicrosoft.com header.i=@oracle.onmicrosoft.com header.b=u2Ubfc2s; arc=fail smtp.client-ip=205.220.177.32 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=oracle.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=oracle.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=oracle.com header.i=@oracle.com header.b="ak8pQiLu"; dkim=pass (1024-bit key) header.d=oracle.onmicrosoft.com header.i=@oracle.onmicrosoft.com header.b="u2Ubfc2s" Received: from pps.filterd (m0246630.ppops.net [127.0.0.1]) by mx0b-00069f02.pphosted.com (8.18.1.2/8.18.1.2) with ESMTP id 4A7HBZ9u024688; Thu, 7 Nov 2024 19:09:16 GMT DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=oracle.com; h=cc :content-transfer-encoding:content-type:date:from:in-reply-to :message-id:mime-version:references:subject:to; s= corp-2023-11-20; bh=KCpMsJmZCRizv1HK7VHHQLxW3ArzQmimptLDQTbndr0=; b= ak8pQiLuJbvexQ7OGSN7ay//bTPfi+pOQAPjXleZkndcESYLSFc6+nMyoGdZu+Tz Bq34nl46WySsQYd352MqYukJ0Mw3UFmZVVL6xIyBpfB4WW+SAvTfzFUWrTIWUGl3 wrhTO4VOA1d5AMgtX31EpWOPPkthP8TgwoDMd9brjuBT05Bz+4QowHHRFg5zsWB0 EeOKalGchOpdstxWTgzoORQ+8aK0mPGLcfsdDVfN8HDRnxSS5G76aM5Uwc8wk8T8 zvQaJp9STz+Sne3VJ9iLsEcxHnZtCQiUx2ayLzEaW3KnXiBW6ExaJVb4/7vXnzQQ bpric7OnZT+VQMD2OKeozQ== Received: from phxpaimrmta02.imrmtpd1.prodappphxaev1.oraclevcn.com (phxpaimrmta02.appoci.oracle.com [147.154.114.232]) by mx0b-00069f02.pphosted.com (PPS) with ESMTPS id 42nagcbc1a-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Thu, 07 Nov 2024 19:09:15 +0000 (GMT) Received: from pps.filterd (phxpaimrmta02.imrmtpd1.prodappphxaev1.oraclevcn.com [127.0.0.1]) by phxpaimrmta02.imrmtpd1.prodappphxaev1.oraclevcn.com (8.18.1.2/8.18.1.2) with ESMTP id 4A7I2sU6008426; Thu, 7 Nov 2024 19:09:14 GMT Received: from nam11-co1-obe.outbound.protection.outlook.com (mail-co1nam11lp2169.outbound.protection.outlook.com [104.47.56.169]) by phxpaimrmta02.imrmtpd1.prodappphxaev1.oraclevcn.com (PPS) with ESMTPS id 42nahaercn-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Thu, 07 Nov 2024 19:09:14 +0000 ARC-Seal: i=1; a=rsa-sha256; s=arcselector10001; d=microsoft.com; cv=none; b=F9rrfYFLjxt50I6Lmac5FiP8uUFY4kHBI4saKamlSIvPa4OyNkVedw7EbzGZE7SuuK8GOEd60B2jX6viduVKFKAbJxmoBPeVXppMf84UpM4FucbxmXniQ8vEUA4Xvc1VfDZvzwJXClxSSc25rdyRMoDUgyF9N8BfGwGDtyYr/fhcHcdiMtgOQNI3oPzlxAAmfRQ/aT7wSUfQ0MxQC6Rw1CuYPMMy1Q+DT1XIdKBPIBb1CQW+zAnmGimuVU50wCgAA+ur0RkCX0810BRQzQkU7xVyHuxh6WL3O9ncqZ2x7B7byDgwSCiH0LYvt/Ipa+FSRlMvOro5UkyszsCyJ6Mh6w== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=microsoft.com; s=arcselector10001; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-AntiSpam-MessageData-ChunkCount:X-MS-Exchange-AntiSpam-MessageData-0:X-MS-Exchange-AntiSpam-MessageData-1; bh=KCpMsJmZCRizv1HK7VHHQLxW3ArzQmimptLDQTbndr0=; b=hxI2a9pG9ieIjQvo84I51gv71esLa9MIzTts5dG17lQxYzrFOx8m9gPpMoi1irgjkIu/fdjbHnjqI/NaqN4yQpJ/n+xx2h/qzXOVJ1YD1erp8xpXlSyxllzhOVgu3wVatXFgR+6s5rKpizNdNLvGF+446mbFvNfqEvehreddUbxHQwhHkomM/tkNCjgrprl08mUBCKQaXO02wsdzhMB8n6GBiuhk4IufET6acQQDec0Wr7z6tM2ko8V4J4WmLGB6J6ARCGsXUyV22jCuD0ggR1GzlIckZnL6vny9Hvuydlo0WwsLX3jWOf+JUXe0hBNEeDCM/A3DXj+5jyHD2U5/Ww== ARC-Authentication-Results: i=1; mx.microsoft.com 1; spf=pass smtp.mailfrom=oracle.com; dmarc=pass action=none header.from=oracle.com; dkim=pass header.d=oracle.com; arc=none DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=oracle.onmicrosoft.com; s=selector2-oracle-onmicrosoft-com; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-SenderADCheck; bh=KCpMsJmZCRizv1HK7VHHQLxW3ArzQmimptLDQTbndr0=; b=u2Ubfc2s1wjtYcJ5MeuuDHFR31s4X925cKVvHpI4MB7xOwMuViYmCEvRos8nJ9cP3J9HTWhO+AVrm1b5Pcd9Hu4noseFP8wk5/sOHLlQ3cNb0Iei5b17B/AJi43TuNegy8D5eoHMKBl1CgzTpn7IBNTYnv2DFi7QJlqOe4Tx2tA= Received: from CO6PR10MB5409.namprd10.prod.outlook.com (2603:10b6:5:357::14) by SJ2PR10MB7037.namprd10.prod.outlook.com (2603:10b6:a03:4c5::14) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.8137.18; Thu, 7 Nov 2024 19:09:04 +0000 Received: from CO6PR10MB5409.namprd10.prod.outlook.com ([fe80::25a9:32c2:a7b0:de9e]) by CO6PR10MB5409.namprd10.prod.outlook.com ([fe80::25a9:32c2:a7b0:de9e%5]) with mapi id 15.20.8137.019; Thu, 7 Nov 2024 19:09:04 +0000 From: Ankur Arora To: linux-pm@vger.kernel.org, kvm@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, linux-arch@vger.kernel.org Cc: catalin.marinas@arm.com, will@kernel.org, tglx@linutronix.de, mingo@redhat.com, bp@alien8.de, dave.hansen@linux.intel.com, x86@kernel.org, hpa@zytor.com, pbonzini@redhat.com, vkuznets@redhat.com, rafael@kernel.org, daniel.lezcano@linaro.org, peterz@infradead.org, arnd@arndb.de, lenb@kernel.org, mark.rutland@arm.com, harisokn@amazon.com, mtosatti@redhat.com, sudeep.holla@arm.com, cl@gentwo.org, maz@kernel.org, misono.tomohiro@fujitsu.com, maobibo@loongson.cn, zhenglifeng1@huawei.com, joao.m.martins@oracle.com, boris.ostrovsky@oracle.com, konrad.wilk@oracle.com Subject: [RFC PATCH v9 15/15] arm64: support WFET in smp_cond_relaxed_timeout() Date: Thu, 7 Nov 2024 11:08:18 -0800 Message-Id: <20241107190818.522639-16-ankur.a.arora@oracle.com> X-Mailer: git-send-email 2.31.1 In-Reply-To: <20241107190818.522639-1-ankur.a.arora@oracle.com> References: <20241107190818.522639-1-ankur.a.arora@oracle.com> X-ClientProxiedBy: MW2PR2101CA0024.namprd21.prod.outlook.com (2603:10b6:302:1::37) To CO6PR10MB5409.namprd10.prod.outlook.com (2603:10b6:5:357::14) Precedence: bulk X-Mailing-List: kvm@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: CO6PR10MB5409:EE_|SJ2PR10MB7037:EE_ X-MS-Office365-Filtering-Correlation-Id: 5438fedb-214c-43a5-5b82-08dcff5fa5b5 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|366016|1800799024|376014|7416014; X-Microsoft-Antispam-Message-Info: hYAWn1pUScq8HbbTR9vmDOBVkI96IXbZtC821AOvfX3hk52tctCxEcUrHKbbJ+mky8fqdA/Mx2/o64BW47TTtzd/C9OYxQUzeUJX9Dl3q1ybNUN0ZvqVFtzpGPBHlv/YV+zwpzUAJJoJ4s2GxxIZ+83BCMl+lqZs0O1UbZUoBnnsyck7Et5Xo7I7Vm5/8QK+ImI2nAMUKYJngNXrRKGvLLZVXDhDy06IWWlJ9Vn0RNnRm783zuEI1GHVZwdSc3TiqJaaKN5JhjPPexo4VVFYOIpVJQ/CCj5MRPOFMCa38oLwGMW1tTczIjzsoM8ivdc0aMnpmR6I8FR67qbmiXZtLnsj/fEkcDWerh3VlZGGqrwe1AULySHpy6VAvOWnt5rvcACEJBlkeaYvBZipioRMnFYX+hp4m2I7R8ifRUOhhZBMRyAc6XrpPpPzZdkH/5hdh5mYw0R5XjjU/Th6Jnb+HN7mN3maHNWG3QYoo1knjcdX8Yk2gwRs0B3RiVMNXAeAkzsbKUg/ZXlQErl0+7Z1HujA7Ckz5k/UM1rGwoLsB60NQVqO1lG9dFAi6MUGtzjlvkIJNtG97s+LhZ7Go/z+O/RgAmlqEkfcxS69o78bAAJHFraq9meSPuDgQkyOdTWKzMrmlovRVW9CrvH8lRSGA8WWIjii7N0K5bIAG6rgI/6Bo0Kfc5WasYtqBAB2pOqhDxLflb7IPmruuvJ+wsAzA/fMh3ihm6orvHyraYmqJFq6OF1g5bf7TkpCDok+QDf8eF4G4Uf0zMv8wMxjiGC2JGdTo+K3EN7bZDaGQmciabDgNuW9Hia4XUQEsmuF6EF1lISsR3BqJV4h2yiN8Mo+ceKvqFflbXInuo/dWCeTh4Jvo9dFhrnWd3J0vbAhDU4sNqsCEwDWfILdMsN463JFRahfmPLEWj/bBkweud6Wezn33k0EABvWkyb8IIZlYcEe8ri6GpBJ45T20XAnkGuJdMBR8xjduEgCMxpzcx1seouWnIBpkmC+MHvigsLW+XDc17fsjKTorLZg6h0WpjWOV2QUyN1VJM+6aXNPlyetmT8Emu/OMYDhCJShpG6Gc9H5L0B3LxELQ6pNGW+rTW8zG8bxHZv28Dz8E2aVaGpMFnsxa8pWdpgPZcUNOz+kaROqvKh8tiGi8bUNPY2qBUomZbIsegga/a9bo9TtVmJK4F+84qyAQMQC3ipwmY8xRHSHPDAuJJPRinnbrrTI+4aHyj/fvn3Ju9CDTp5UJy9320rv9S75HiNuRCABQoqoNibjWk3eyR+yIR25/kLPdfi+KDRo7HcwEC++yHLzwfRqIEo= X-Forefront-Antispam-Report: CIP:255.255.255.255;CTRY:;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:CO6PR10MB5409.namprd10.prod.outlook.com;PTR:;CAT:NONE;SFS:(13230040)(366016)(1800799024)(376014)(7416014);DIR:OUT;SFP:1101; X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: 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 X-MS-Exchange-AntiSpam-ExternalHop-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-ExternalHop-MessageData-0: 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 X-OriginatorOrg: oracle.com X-MS-Exchange-CrossTenant-Network-Message-Id: 5438fedb-214c-43a5-5b82-08dcff5fa5b5 X-MS-Exchange-CrossTenant-AuthSource: CO6PR10MB5409.namprd10.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-OriginalArrivalTime: 07 Nov 2024 19:09:04.8340 (UTC) X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted X-MS-Exchange-CrossTenant-Id: 4e2c6054-71cb-48f1-bd6c-3a9705aca71b X-MS-Exchange-CrossTenant-MailboxType: HOSTED X-MS-Exchange-CrossTenant-UserPrincipalName: NbwoBMTYz20pQQaaVXIOp7NSO3VmLObnk9tiltkb7ZtHh78R2Bm6fn1exkzKAaaO/wNaSjspjB58afVmMqR3LxmaikouolYCuNR9BC5Aig0= X-MS-Exchange-Transport-CrossTenantHeadersStamped: SJ2PR10MB7037 X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1057,Hydra:6.0.680,FMLib:17.12.62.30 definitions=2024-11-07_08,2024-11-07_01,2024-09-30_01 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 mlxlogscore=999 bulkscore=0 spamscore=0 adultscore=0 phishscore=0 suspectscore=0 malwarescore=0 mlxscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2409260000 definitions=main-2411070150 X-Proofpoint-ORIG-GUID: iWoBOumy3YHu1D3dDDRF7lMFulrb7bHm X-Proofpoint-GUID: iWoBOumy3YHu1D3dDDRF7lMFulrb7bHm Support a WFET based implementation of the waited variant of smp_cond_load_relaxed_timeout(). Signed-off-by: Ankur Arora --- arch/arm64/include/asm/barrier.h | 12 ++++++++---- arch/arm64/include/asm/cmpxchg.h | 26 +++++++++++++++++--------- 2 files changed, 25 insertions(+), 13 deletions(-) diff --git a/arch/arm64/include/asm/barrier.h b/arch/arm64/include/asm/barrier.h index ab2515ecd6ca..6fcec5c12c4d 100644 --- a/arch/arm64/include/asm/barrier.h +++ b/arch/arm64/include/asm/barrier.h @@ -12,6 +12,7 @@ #include #include +#include #define __nops(n) ".rept " #n "\nnop\n.endr\n" #define nops(n) asm volatile(__nops(n)) @@ -198,7 +199,7 @@ do { \ VAL = READ_ONCE(*__PTR); \ if (cond_expr) \ break; \ - __cmpwait_relaxed(__PTR, VAL); \ + __cmpwait_relaxed(__PTR, VAL, ~0UL); \ } \ (typeof(*ptr))VAL; \ }) @@ -211,7 +212,7 @@ do { \ VAL = smp_load_acquire(__PTR); \ if (cond_expr) \ break; \ - __cmpwait_relaxed(__PTR, VAL); \ + __cmpwait_relaxed(__PTR, VAL, ~0UL); \ } \ (typeof(*ptr))VAL; \ }) @@ -241,11 +242,13 @@ do { \ ({ \ typeof(ptr) __PTR = (ptr); \ __unqual_scalar_typeof(*ptr) VAL; \ + const unsigned long __time_limit_cycles = \ + NSECS_TO_CYCLES(time_limit_ns); \ for (;;) { \ VAL = READ_ONCE(*__PTR); \ if (cond_expr) \ break; \ - __cmpwait_relaxed(__PTR, VAL); \ + __cmpwait_relaxed(__PTR, VAL, __time_limit_cycles); \ if ((time_expr_ns) >= time_limit_ns) \ break; \ } \ @@ -257,7 +260,8 @@ do { \ ({ \ __unqual_scalar_typeof(*ptr) _val; \ \ - int __wfe = arch_timer_evtstrm_available(); \ + int __wfe = arch_timer_evtstrm_available() || \ + alternative_has_cap_unlikely(ARM64_HAS_WFXT); \ if (likely(__wfe)) \ _val = __smp_cond_load_timeout_wait(ptr, cond_expr, \ time_expr_ns, \ diff --git a/arch/arm64/include/asm/cmpxchg.h b/arch/arm64/include/asm/cmpxchg.h index d7a540736741..bb842dab5d0e 100644 --- a/arch/arm64/include/asm/cmpxchg.h +++ b/arch/arm64/include/asm/cmpxchg.h @@ -210,7 +210,8 @@ __CMPXCHG_GEN(_mb) #define __CMPWAIT_CASE(w, sfx, sz) \ static inline void __cmpwait_case_##sz(volatile void *ptr, \ - unsigned long val) \ + unsigned long val, \ + unsigned long time_limit_cycles) \ { \ unsigned long tmp; \ \ @@ -220,10 +221,12 @@ static inline void __cmpwait_case_##sz(volatile void *ptr, \ " ldxr" #sfx "\t%" #w "[tmp], %[v]\n" \ " eor %" #w "[tmp], %" #w "[tmp], %" #w "[val]\n" \ " cbnz %" #w "[tmp], 1f\n" \ - " wfe\n" \ + ALTERNATIVE("wfe\n", \ + "msr s0_3_c1_c0_0, %[time_limit_cycles]\n", \ + ARM64_HAS_WFXT) \ "1:" \ : [tmp] "=&r" (tmp), [v] "+Q" (*(u##sz *)ptr) \ - : [val] "r" (val)); \ + : [val] "r" (val), [time_limit_cycles] "r" (time_limit_cycles));\ } __CMPWAIT_CASE(w, b, 8); @@ -236,17 +239,22 @@ __CMPWAIT_CASE( , , 64); #define __CMPWAIT_GEN(sfx) \ static __always_inline void __cmpwait##sfx(volatile void *ptr, \ unsigned long val, \ + unsigned long time_limit_cycles, \ int size) \ { \ switch (size) { \ case 1: \ - return __cmpwait_case##sfx##_8(ptr, (u8)val); \ + return __cmpwait_case##sfx##_8(ptr, (u8)val, \ + time_limit_cycles); \ case 2: \ - return __cmpwait_case##sfx##_16(ptr, (u16)val); \ + return __cmpwait_case##sfx##_16(ptr, (u16)val, \ + time_limit_cycles); \ case 4: \ - return __cmpwait_case##sfx##_32(ptr, val); \ + return __cmpwait_case##sfx##_32(ptr, val, \ + time_limit_cycles); \ case 8: \ - return __cmpwait_case##sfx##_64(ptr, val); \ + return __cmpwait_case##sfx##_64(ptr, val, \ + time_limit_cycles); \ default: \ BUILD_BUG(); \ } \ @@ -258,7 +266,7 @@ __CMPWAIT_GEN() #undef __CMPWAIT_GEN -#define __cmpwait_relaxed(ptr, val) \ - __cmpwait((ptr), (unsigned long)(val), sizeof(*(ptr))) +#define __cmpwait_relaxed(ptr, val, time_limit_cycles) \ + __cmpwait((ptr), (unsigned long)(val), time_limit_cycles, sizeof(*(ptr))) #endif /* __ASM_CMPXCHG_H */