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X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: U3o2u95Na7oRXi0A7s7zqnYyJAAvMG9hrtYj7GrFh2KohL5UyiYJHmURVFIjc+vSYzYOXQWB0JNiNYoXKuGziTW/jnA1O1u3f4vr1fHjXPqDahwMrv4Y0yjLYllI/6ex2nxpB411uSsxmPiRss5hygab5ifpmj3C1IjTX07IR8D/cZXHOoqlM7Y0areD8IskT4o7DeZFzFntePfL3hAUUtMltw9DZzRFkbyAv/ax0F1aa2i090YFKdoL7AXaPuft3u0jfN9/Y053uTQOzHt9bYRCmK0gldshac3DknhgifXRRC9C5Gl6NpFkzMvpPHoxzp4+GSUDCPg4+0WY0k0sgwmLJYbt3VVGu/tBkVkOExnAsSSLEH2Se/5gsT7ISj45ltY5JveD5X0mJX99DfP5FUEgQAT60vpPsbgVF08VyOj0DW0uosJGwGJ0zLpr7Aow X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 29 Jun 2026 09:45:07.6499 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 7d0d0db6-4f66-4ad7-c761-08ded5c31abb 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: CH2PEPF0000009E.namprd02.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: CH2PR12MB4069 This series extends the x86 topology cpu_type classification to support a Low Power core type, in addition to the existing Performance and Efficiency types. AMD heterogeneous parts report the core type via CPUID Fn0x80000026 EBX[31:28] (Extended CPU Topology, Core Type). Value 2 identifies a low-power core designed for minimal power consumption during background or idle workloads. Distinguishing it from a regular efficiency core matters for: - user space exposure via /sys/kernel/debug/x86/topo/cpus/*, which today reports cpu_type "unknown" for low-power cores - amd_get_boost_ratio_numerator(): on every X86_FEATURE_AMD_HTR_CORES-capable AMD/Hygon part, low-power cores must scale by amd_get_highest_perf() rather than the fixed CPPC_HIGHEST_PERF_PERFORMANCE ceiling, matching the existing efficiency-core path The series is structured as: 1/2 Pre-patch: replace the bare 0/1 in get_topology_cpu_type() with named enum amd_cpu_type constants, mirroring the existing Intel side. No functional change. 2/2 Add TOPO_CPU_TYPE_LOW_POWER, wire it through get_topology_cpu_type(), get_topology_cpu_type_name() and the switch in amd_get_boost_ratio_numerator() so allmodconfig builds cleanly under -Werror=switch. Vishal Badole (2): x86/topology: Name the AMD core-type values x86/topology: Add TOPO_CPU_TYPE_LOW_POWER arch/x86/include/asm/topology.h | 7 +++++++ arch/x86/kernel/acpi/cppc.c | 3 ++- arch/x86/kernel/cpu/topology_common.c | 7 +++++-- 3 files changed, 14 insertions(+), 3 deletions(-) -- 2.34.1