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b=PlAiH1hy2H90QZyh5tauZ7RTbumI1HKkUK8EJM3bfs48aSnLJZovffBJKMTH0RFrH4e92jqELcQ6AchzRFPIkY/zer8/PyD2odbdn+TrytNzfIj/d3YDmnORFjAwILDwhRiS7QL+wBAtsnAA6AHZtY7nG38/+OaOiK1/qQTIhww/AskMVC7g4OdQonfDwRSV1fBekpCSUWa0lQ/iRpVX9w6uqSOCq6+ErhtXMox5zz/hwgT3eIFavGjoDcAW/hJTuwsqiMF2TGx5UZngxLW3IkxWsP98xmrY0ufHwH8h7FLFZWpAxLr8NG2PECj301yYEd8W4pNlPtnTjOMZ6vilJw== Authentication-Results: mx.microsoft.com 1; dkim=none (message not signed) header.d=none;dmarc=none action=none header.from=nvidia.com; Received: from DM4PR12MB5230.namprd12.prod.outlook.com (2603:10b6:5:399::11) by CH3PR12MB8880.namprd12.prod.outlook.com (2603:10b6:610:17b::18) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.21.592.13; Mon, 9 Nov 2026 21:29:45 +0000 Received: from DM4PR12MB5230.namprd12.prod.outlook.com ([fe80::6e87:1bde:1853:3b73]) by DM4PR12MB5230.namprd12.prod.outlook.com ([fe80::6e87:1bde:1853:3b73%4]) with mapi id 15.21.0569.011; Mon, 9 Nov 2026 21:29:45 +0000 From: Fenghua Yu To: Reinette Chatre , Tony Luck , Ben Horgan , James Morse , Will Deacon , Dave Martin , Catalin Marinas , Shaopeng Tan , Chen Yu , Babu Moger , Drew Fustini , Vikram Sethi , Shanker Donthineni , Newton Liu , Richard Cheng Cc: linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, Fenghua Yu Subject: [PATCH RFC v1 2/6] arm_mpam: resctrl: probe MPAMF_MBW_IDR MAX_LIM and hardlim_rw Date: Mon, 9 Nov 2026 13:29:33 -0800 Message-ID: <20261109212937.1409570-3-fenghuay@nvidia.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20261109212937.1409570-1-fenghuay@nvidia.com> References: <20261109212937.1409570-1-fenghuay@nvidia.com> Content-Transfer-Encoding: 8bit Content-Type: text/plain X-ClientProxiedBy: BY1P220CA0010.NAMP220.PROD.OUTLOOK.COM (2603:10b6:a03:59d::12) To DM4PR12MB5230.namprd12.prod.outlook.com (2603:10b6:5:399::11) X-Archived-By: MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: DM4PR12MB5230:EE_|CH3PR12MB8880:EE_ X-MS-Office365-Filtering-Correlation-Id: 152181d2-fdfb-4e6f-9b54-08df3ea8931f X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|23010399003|376014|7416014|1800799024|366016|921020|11063799006|56012099006|261026121527099003|261021121427099003|261021123027099003|261009223027099003|261102123227099003|10067099003|22082099003|18002099003|6133799003; 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MSCs on the same system may differ; inconsistent merge would expose controls on hardware that cannot honour them. Read mbw_max_lim from MPAMF_MBW_IDR when MBW_MAX is present, derive mpam_feat_mbw_max_hardlim_rw when soft and hard limiting are both supported, merge capability across MSCs, and keep the merged view in sync via mpam_props_sync_mbw_max_hardlim_rw(). Signed-off-by: Fenghua Yu --- drivers/resctrl/mpam_devices.c | 40 ++++++++++++++++++++++++++++++++- drivers/resctrl/mpam_internal.h | 7 ++++++ 2 files changed, 46 insertions(+), 1 deletion(-) diff --git a/drivers/resctrl/mpam_devices.c b/drivers/resctrl/mpam_devices.c index cb6096e9d2cf..1e56e8f3858e 100644 --- a/drivers/resctrl/mpam_devices.c +++ b/drivers/resctrl/mpam_devices.c @@ -830,6 +830,19 @@ static bool mpam_ris_hw_probe_csu_nrdy(struct mpam_msc_ris *ris) return (!can_set || !can_clear); } +/* Align mpam_feat_mbw_max_hardlim_rw with MPAMF_MBW_IDR.MAX_LIM and mbw_max. */ +static void mpam_props_sync_mbw_max_hardlim_rw(struct mpam_props *props) +{ + if (!mpam_has_feature(mpam_feat_mbw_max, props)) { + mpam_clear_feature(mpam_feat_mbw_max_hardlim_rw, props); + return; + } + if (props->mbw_max_lim == 0) + mpam_set_feature(mpam_feat_mbw_max_hardlim_rw, props); + else + mpam_clear_feature(mpam_feat_mbw_max_hardlim_rw, props); +} + static void mpam_ris_hw_probe(struct mpam_msc_ris *ris) { int err; @@ -877,6 +890,8 @@ static void mpam_ris_hw_probe(struct mpam_msc_ris *ris) if (FIELD_GET(MPAMF_IDR_HAS_MBW_PART, ris->idr)) { u32 mbw_features = mpam_read_partsel_reg(msc, MBW_IDR); + props->mbw_max_lim = 0; + /* portion bitmap resolution */ props->mbw_pbm_bits = FIELD_GET(MPAMF_MBW_IDR_BWPBM_WD, mbw_features); if (props->mbw_pbm_bits && @@ -891,14 +906,18 @@ static void mpam_ris_hw_probe(struct mpam_msc_ris *ris) */ props->bwa_wd = min(props->bwa_wd, 16); - if (props->bwa_wd && FIELD_GET(MPAMF_MBW_IDR_HAS_MAX, mbw_features)) + if (props->bwa_wd && FIELD_GET(MPAMF_MBW_IDR_HAS_MAX, mbw_features)) { mpam_set_feature(mpam_feat_mbw_max, props); + props->mbw_max_lim = FIELD_GET(MPAMF_MBW_IDR_MAX_LIM, mbw_features); + } if (props->bwa_wd && FIELD_GET(MPAMF_MBW_IDR_HAS_MIN, mbw_features)) mpam_set_feature(mpam_feat_mbw_min, props); if (props->bwa_wd && FIELD_GET(MPAMF_MBW_IDR_HAS_PROP, mbw_features)) mpam_set_feature(mpam_feat_mbw_prop, props); + + mpam_props_sync_mbw_max_hardlim_rw(props); } /* Priority partitioning */ @@ -2252,12 +2271,31 @@ static void __props_mismatch(struct mpam_props *parent, if (alias && !mpam_has_bwa_wd_feature(parent) && mpam_has_bwa_wd_feature(child)) { parent->bwa_wd = child->bwa_wd; + parent->mbw_max_lim = child->mbw_max_lim; + if (mpam_has_feature(mpam_feat_mbw_max_hardlim_rw, child)) + mpam_set_feature(mpam_feat_mbw_max_hardlim_rw, parent); + else + mpam_clear_feature(mpam_feat_mbw_max_hardlim_rw, parent); } else if (MISMATCHED_HELPER(parent, child, mpam_has_bwa_wd_feature, bwa_wd, alias)) { pr_debug("took the min bwa_wd\n"); parent->bwa_wd = min(parent->bwa_wd, child->bwa_wd); } + if (CAN_MERGE_FEAT(parent, child, mpam_feat_mbw_max, alias)) { + parent->mbw_max_lim = child->mbw_max_lim; + if (mpam_has_feature(mpam_feat_mbw_max_hardlim_rw, child)) + mpam_set_feature(mpam_feat_mbw_max_hardlim_rw, parent); + else + mpam_clear_feature(mpam_feat_mbw_max_hardlim_rw, parent); + } else if (MISMATCHED_FEAT(parent, child, mpam_feat_mbw_max, + mbw_max_lim, alias)) { + pr_debug("%s mbw_max_lim mismatch, clearing mbw_max\n", __func__); + mpam_clear_feature(mpam_feat_mbw_max, parent); + parent->mbw_max_lim = 0; + mpam_props_sync_mbw_max_hardlim_rw(parent); + } + if (alias && !mpam_has_cmax_wd_feature(parent) && mpam_has_cmax_wd_feature(child)) { parent->cmax_wd = child->cmax_wd; } else if (MISMATCHED_HELPER(parent, child, mpam_has_cmax_wd_feature, diff --git a/drivers/resctrl/mpam_internal.h b/drivers/resctrl/mpam_internal.h index 1c9e0e8b78a9..6be32b2cb0ab 100644 --- a/drivers/resctrl/mpam_internal.h +++ b/drivers/resctrl/mpam_internal.h @@ -172,6 +172,7 @@ enum mpam_device_features { mpam_feat_mbw_part, mpam_feat_mbw_min, mpam_feat_mbw_max, + mpam_feat_mbw_max_hardlim_rw, mpam_feat_mbw_prop, mpam_feat_intpri_part, mpam_feat_intpri_part_0_low, @@ -203,6 +204,11 @@ struct mpam_props { u16 dspri_wd; u16 num_csu_mon; u16 num_mbwu_mon; + /* + * MPAMF_MBW_IDR.MAX_LIM [1:0] when mpam_feat_mbw_max; else 0. + * 0 = soft+hard, 1 = soft only, 2 = hard only, 3 = reserved. + */ + u8 mbw_max_lim; /* * Kunit tests use memset() to set up feature combinations that should be @@ -585,6 +591,7 @@ static inline void mpam_resctrl_teardown_class(struct mpam_class *class) { } /* MPAMF_MBW_IDR - MPAM features memory bandwidth partitioning ID register */ #define MPAMF_MBW_IDR_BWA_WD GENMASK(5, 0) +#define MPAMF_MBW_IDR_MAX_LIM GENMASK(9, 8) #define MPAMF_MBW_IDR_HAS_MIN BIT(10) #define MPAMF_MBW_IDR_HAS_MAX BIT(11) #define MPAMF_MBW_IDR_HAS_PBM BIT(12) -- 2.53.0