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Tue, 28 Mar 2023 20:51:54 -0500 From: Wenyou Yang To: , , , , , , , , , CC: , , , , , , , Wenyou Yang Subject: [PATCH v3 1/2] cpu/smt: add a notifier to notify the SMT changes Date: Wed, 29 Mar 2023 09:51:48 +0800 Message-ID: <20230329015149.870132-2-WenYou.Yang@amd.com> X-Mailer: git-send-email 2.39.2 In-Reply-To: <20230329015149.870132-1-WenYou.Yang@amd.com> References: <20230329015149.870132-1-WenYou.Yang@amd.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: BN8NAM11FT106:EE_|CY8PR12MB7434:EE_ X-MS-Office365-Filtering-Correlation-Id: e5581fd5-11a5-47fd-72d9-08db2ff82f81 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; X-Microsoft-Antispam-Message-Info: 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 X-Forefront-Antispam-Report: CIP:165.204.84.17;CTRY:US;LANG:en;SCL:1;SRV:;IPV:CAL;SFV:NSPM;H:SATLEXMB04.amd.com;PTR:InfoDomainNonexistent;CAT:NONE;SFS:(13230028)(4636009)(136003)(396003)(346002)(376002)(39860400002)(451199021)(36840700001)(46966006)(40470700004)(83380400001)(336012)(36860700001)(70586007)(2906002)(921005)(40480700001)(356005)(54906003)(1076003)(316002)(4326008)(86362001)(41300700001)(5660300002)(110136005)(6666004)(81166007)(8936002)(40460700003)(47076005)(426003)(8676002)(7696005)(82310400005)(70206006)(82740400003)(478600001)(26005)(2616005)(36756003)(186003)(36900700001);DIR:OUT;SFP:1101; X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 29 Mar 2023 01:51:59.7683 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: e5581fd5-11a5-47fd-72d9-08db2ff82f81 X-MS-Exchange-CrossTenant-Id: 3dd8961f-e488-4e60-8e11-a82d994e183d X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=3dd8961f-e488-4e60-8e11-a82d994e183d;Ip=[165.204.84.17];Helo=[SATLEXMB04.amd.com] X-MS-Exchange-CrossTenant-AuthSource: BN8NAM11FT106.eop-nam11.prod.protection.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: CY8PR12MB7434 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Type: text/plain; charset="utf-8" Add the notifier chain to notify the cpu SMT status changes Signed-off-by: Wenyou Yang --- include/linux/cpu.h | 5 +++++ kernel/cpu.c | 10 +++++++++- 2 files changed, 14 insertions(+), 1 deletion(-) diff --git a/include/linux/cpu.h b/include/linux/cpu.h index 314802f98b9d..9a842317fe2d 100644 --- a/include/linux/cpu.h +++ b/include/linux/cpu.h @@ -213,6 +213,11 @@ enum cpuhp_smt_control { CPU_SMT_NOT_IMPLEMENTED, }; =20 +enum cpuhp_smt_status { + SMT_ENABLED, + SMT_DISABLED, +}; + #if defined(CONFIG_SMP) && defined(CONFIG_HOTPLUG_SMT) extern enum cpuhp_smt_control cpu_smt_control; extern void cpu_smt_disable(bool force); diff --git a/kernel/cpu.c b/kernel/cpu.c index 6c0a92ca6bb5..1af66a3ffd99 100644 --- a/kernel/cpu.c +++ b/kernel/cpu.c @@ -89,6 +89,9 @@ static DEFINE_PER_CPU(struct cpuhp_cpu_state, cpuhp_state= ) =3D { cpumask_t cpus_booted_once_mask; #endif =20 +RAW_NOTIFIER_HEAD(smt_notifier_head); +EXPORT_SYMBOL(smt_notifier_head); + #if defined(CONFIG_LOCKDEP) && defined(CONFIG_SMP) static struct lockdep_map cpuhp_state_up_map =3D STATIC_LOCKDEP_MAP_INIT("cpuhp_state-up", &cpuhp_state_up_map); @@ -2281,8 +2284,10 @@ int cpuhp_smt_disable(enum cpuhp_smt_control ctrlval) */ cpuhp_offline_cpu_device(cpu); } - if (!ret) + if (!ret) { cpu_smt_control =3D ctrlval; + raw_notifier_call_chain(&smt_notifier_head, SMT_DISABLED, NULL); + } cpu_maps_update_done(); return ret; } @@ -2303,6 +2308,9 @@ int cpuhp_smt_enable(void) /* See comment in cpuhp_smt_disable() */ cpuhp_online_cpu_device(cpu); } + if (!ret) + raw_notifier_call_chain(&smt_notifier_head, SMT_ENABLED, NULL); + cpu_maps_update_done(); return ret; } --=20 2.39.2