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client-ip=165.204.84.17; helo=satlexmb07.amd.com; pr=C Received: from satlexmb07.amd.com (165.204.84.17) by MWH0EPF000C6188.mail.protection.outlook.com (10.167.249.120) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.21.139.8 via Frontend Transport; Sat, 13 Jun 2026 19:18:21 +0000 Received: from dcsm-trdripper1.amd.com (10.180.168.240) by satlexmb07.amd.com (10.181.42.216) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.2562.41; Sat, 13 Jun 2026 14:18:11 -0500 From: Muralidhara M K To: CC: , , Muralidhara M K Subject: [PATCH 0/3] platform/x86/amd/hsmp: Harden ACPI probe, metric DRAM, and socket teardown Date: Sun, 14 Jun 2026 00:47:52 +0530 Message-ID: <20260613191755.2358969-1-muralidhara.mk@amd.com> X-Mailer: git-send-email 2.34.1 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Content-Type: text/plain X-ClientProxiedBy: satlexmb08.amd.com (10.181.42.217) To satlexmb07.amd.com (10.181.42.216) X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: MWH0EPF000C6188:EE_|DS7PR12MB5912:EE_ X-MS-Office365-Filtering-Correlation-Id: cb01455c-641f-4f65-da48-08dec9808858 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|1800799024|376014|36860700016|23010399003|82310400026|56012099006|11063799006|18002099003; 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X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: xiM5WCizNZcnd4PjHEgHHL/6n8NHPFhBQdrfaf6FooJWp2nrdySMGfhJA9L715TcWLl2C11WHhuV3UjG9OqNozsloGyi+6GtKIPPpqaEFLpbvz+MpqRJF82KtopRmdg8SqEYOmTx/7qu5gm+4OCSiLJG0sWrh15G48lXVkhYpUwh9BkcSH3+GrrulCKpoHw4OuycqY2ifDsWVGHvYZ+mRmt4/KnXDEbpHENNoI9IyFjQkCD0G1aQIqSOtilYUtFTC4u/PrTTkop/Dk+MWfjbOnSs2bxLMrkBfSh9noIKzotSNUQbKArJCPKCTBSzSvrS2MCYVpXfxhc3auRfIviA3jP3zkTu18EPimwnW4oWwrHhni/VVczCJd94DDb3ccPu/KFKdYnIs0AEZ8q3aNmAqzKBYhhHpNPUs9kzWru6G45wHa7OWDpI9OWg6W2s16Z6 X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 13 Jun 2026 19:18:21.2930 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: cb01455c-641f-4f65-da48-08dec9808858 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=[satlexmb07.amd.com] X-MS-Exchange-CrossTenant-AuthSource: MWH0EPF000C6188.namprd02.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: DS7PR12MB5912 This series tightens concurrency and lifetime management in the ACPI-backed AMD HSMP platform path so probe/remove races cannot corrupt global probe state, leak metric-table DRAM mappings, or tear down shared resources while readers might still be active. Patch 1 introduces a dedicated probe mutex around ACPI probe, remove, and init_acpi(), replacing ad-hoc synchronization on the global is_probed handshake. lockdep_assert_held() documents the locking contract for init_acpi(). Patch 2 switches metric table DRAM from devm_ioremap() to ioremap() with explicit init/teardown helpers, and embeds a per-socket mutex for metric reads. The legacy platform driver wires the same helpers so non-ACPI builds stay consistent. Patch 3 replaces the global is_probed flag with miscdevice registration state, refcounts ACPI socket platform devices with kref, and runs coordinated release on the final put: misc deregistration when appropriate, metric unmap, and socket array free. Socket storage uses kcalloc() with careful failure cleanup before any kref is published. Muralidhara M K (3): platform/x86/amd/hsmp: Serialize ACPI HSMP is_probed with a probe mutex platform/x86/amd/hsmp: Add explicit metric DRAM mapping and per-socket mutexes platform/x86/amd/hsmp: ACPI HSMP refcounted sockets and coordinated release drivers/platform/x86/amd/hsmp/acpi.c | 87 +++++++++++++++++++++++----- drivers/platform/x86/amd/hsmp/hsmp.c | 38 +++++++++++- drivers/platform/x86/amd/hsmp/hsmp.h | 9 ++- drivers/platform/x86/amd/hsmp/plat.c | 3 + 4 files changed, 119 insertions(+), 18 deletions(-) -- 2.34.1