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client-ip=165.204.84.17; helo=SATLEXMB04.amd.com; pr=C Received: from SATLEXMB04.amd.com (165.204.84.17) by CY4PEPF0000E9CE.mail.protection.outlook.com (10.167.241.133) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.20.8093.14 via Frontend Transport; Wed, 23 Oct 2024 17:44:43 +0000 Received: from AUS-P9-MLIMONCI.amd.com (10.180.168.240) by SATLEXMB04.amd.com (10.181.40.145) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2507.39; Wed, 23 Oct 2024 12:44:40 -0500 From: Mario Limonciello To: Borislav Petkov CC: Thomas Gleixner , Ingo Molnar , "Dave Hansen" , "maintainer:X86 ARCHITECTURE (32-BIT AND 64-BIT)" , "H . Peter Anvin" , "Rafael J . Wysocki" , "Gautham R . Shenoy" , Mario Limonciello , Perry Yuan , Brijesh Singh , Peter Zijlstra , Li RongQing , "open list:X86 ARCHITECTURE (32-BIT AND 64-BIT)" , "open list:ACPI" , "open list:AMD PSTATE DRIVER" , Pawan Gupta Subject: [PATCH v3 4/5] x86/cpu: Add CPU type to struct cpuinfo_topology Date: Wed, 23 Oct 2024 12:43:56 -0500 Message-ID: <20241023174357.34338-5-mario.limonciello@amd.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20241023174357.34338-1-mario.limonciello@amd.com> References: <20241023174357.34338-1-mario.limonciello@amd.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-ClientProxiedBy: SATLEXMB03.amd.com (10.181.40.144) To SATLEXMB04.amd.com (10.181.40.145) X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: CY4PEPF0000E9CE:EE_|SJ2PR12MB8181:EE_ X-MS-Office365-Filtering-Correlation-Id: 49bcdb5f-a964-47c2-8533-08dcf38a60bc X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|7416014|36860700013|376014|82310400026|1800799024; X-Microsoft-Antispam-Message-Info: =?us-ascii?Q?VCTEEN8OXFj+wubX+2AfM5o+1Vr0hsfRBnhska8h5TRaKhho9O6j/WttTQ3C?= =?us-ascii?Q?lLV6Bl61+iM9en4zuFaFQxVvKTnoxw/FMPpRjGHxyrkjd6fVX9VP9rrRQj7P?= =?us-ascii?Q?ygLf/atasbgBddGD8/tEENVuuJRjdGFzvHg7uSFyDw0lP07bQrXZXD6/DCxX?= =?us-ascii?Q?jU9gvyKPAb4ch+iY9AbVeWI5MQmZZylrsfKlM5DW7rWvOisg96dqynjeQusa?= =?us-ascii?Q?b43FejykngDh8KjMrlM6SMIXgLFkSO2wIYFwQZw4+YMeGktnj0XUwfqd4VC3?= =?us-ascii?Q?H3XzBs+//MY27h/cp+rcSkAdYo6NZtSvC/OeCXyZV4TA5QDVYW2QrhihT5pO?= =?us-ascii?Q?0Vc7B8N+r37NH51SLRW/pOc8lr7I2wNP8dyTD18dB5SzzlnOpMZOPaI/xOkG?= =?us-ascii?Q?0jQ2Iep78FTcIoaiuxCPvf6VENbsS7Sh9Cl1L3QBeiclAWmdOOT0Q2I/w+Mm?= =?us-ascii?Q?CnE36hnmmJXLeA+vwXyvGSUgUW/yUJk4nL1IZz0Tm2cpn3ER50tEitcFJYsy?= =?us-ascii?Q?Y/M30wzW3f0Lq2qoQ1huxUx+pUmvesNUA7LRK9l51eF61/hf6Jkm4QDdz6Jq?= =?us-ascii?Q?/y0gcMOJWJ64Z86oKstouVSNvSycE75GSJx5/KVZ6svmkUYzZWEToX+WMpf7?= =?us-ascii?Q?CvEhrmBdtukjGWE2tmIW3SQeZAA4eYaSQrMOcqnw85pY+fojqV+5lMJD1IIN?= =?us-ascii?Q?JvnmJ3PDDSNBZ/+1JJ06axDdoDrysTV8qEkgnj1+7fRelzDh2zw/1vlZPUOp?= =?us-ascii?Q?HRnh27tHE2DVSTl0kyR2qmTDEv4WU+v1DvO7Kqm2s80rsGFou6MC25JLnO36?= =?us-ascii?Q?Ob/tkwZvgtVozoDVBvI9XtTyXC4Cs5wf5dE1xMojjdNBCPQWtU9KnnBgIX+f?= =?us-ascii?Q?vvbJy6b6vGPYAcl35pKfK7sa261duWwHbskcGvsQd5lbTVz2/Vx5p+++NSaW?= =?us-ascii?Q?pqG9EAPW3dgipfvyH5/YZasU4Vwvn3zMdv62VaurfqaMNGIl2xsOdn2Sgf++?= =?us-ascii?Q?xAMqOmDvYYqc5D6aXbs770SBPiGlbpLsk7ONlvshhh6NaT7eY0IWvvctgI2d?= =?us-ascii?Q?xvgnqAIbaoMi5WIn21fnduh2aYNgYvlPi/AVa2FLwTRaQ4ncQ5j00YDGkwEN?= =?us-ascii?Q?6UdTYmNB2g4yHG3Vjv7v97IOtmxVH8NUxC4lNi6AIVkX74m75rbegQkrPs1w?= =?us-ascii?Q?w22+40uo6CVzISq44G+TBmxSqzeMe+rJSFQx+atf4Yna6NsNsl1iuw4/+FIq?= =?us-ascii?Q?N6lWM+TZcT+VbguUp6m/5qTqBGUPO6STY5Dei85QJJc/jsQKRlYVQCVLo04v?= =?us-ascii?Q?m5WE3dvYtCtC0qOXQPDd+XuY5PlE5943GxaQRq8wm+OZVOTBaAe08npLgcyT?= =?us-ascii?Q?a11Ejc5j6SHd9ZTc8RweHawZnY6qFFerIWifgTGFSkK4BZSg8g=3D=3D?= 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:(13230040)(7416014)(36860700013)(376014)(82310400026)(1800799024);DIR:OUT;SFP:1101; X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 23 Oct 2024 17:44:43.2209 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 49bcdb5f-a964-47c2-8533-08dcf38a60bc 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: CY4PEPF0000E9CE.namprd03.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: SJ2PR12MB8181 Content-Type: text/plain; charset="utf-8" From: Pawan Gupta Sometimes it is required to take actions based on if a CPU is a performance or efficiency core. As an example, intel_pstate driver uses the Intel core-type to determine CPU scaling. Also, some CPU vulnerabilities only affect a specific CPU type, like RFDS only affects Intel Atom. Hybrid systems that have variants P+E, P-only(Core) and E-only(Atom), it is not straightforward to identify which variant is affected by a type specific vulnerability. Such processors do have CPUID field that can uniquely identify them. Like, P+E, P-only and E-only enumerates CPUID.1A.CORE_TYPE identification, while P+E additionally enumerates CPUID.7.HYBRID. Based on this information, it is possible for boot CPU to identify if a system has mixed CPU types. Add a new field hw_cpu_type to struct cpuinfo_topology that stores the hardware specific CPU type. This saves the overhead of IPIs to get the CPU type of a different CPU. CPU type is populated early in the boot process, before vulnerabilities are enumerated. Signed-off-by: Pawan Gupta Co-developed-by: Mario Limonciello Signed-off-by: Mario Limonciello Acked-by: Dave Hansen --- v2->v3: * Remove a bunch of boilerplate code * Convert to showing string in debugfs * Rename to get_topology_generic_cpu_type/get_topology_cpu_type_name * Add Intel definitions to intel-family.h --- arch/x86/include/asm/intel-family.h | 6 +++++ arch/x86/include/asm/processor.h | 18 ++++++++++++++ arch/x86/include/asm/topology.h | 9 +++++++ arch/x86/kernel/cpu/debugfs.c | 1 + arch/x86/kernel/cpu/topology_amd.c | 3 +++ arch/x86/kernel/cpu/topology_common.c | 34 +++++++++++++++++++++++++++ 6 files changed, 71 insertions(+) diff --git a/arch/x86/include/asm/intel-family.h b/arch/x86/include/asm/int= el-family.h index 1a42f829667a3..7367644720484 100644 --- a/arch/x86/include/asm/intel-family.h +++ b/arch/x86/include/asm/intel-family.h @@ -183,4 +183,10 @@ /* Family 19 */ #define INTEL_PANTHERCOVE_X IFM(19, 0x01) /* Diamond Rapids */ =20 +/* CPU core types */ +enum intel_cpu_type { + INTEL_CPU_TYPE_ATOM =3D 0x20, + INTEL_CPU_TYPE_CORE =3D 0x40, +}; + #endif /* _ASM_X86_INTEL_FAMILY_H */ diff --git a/arch/x86/include/asm/processor.h b/arch/x86/include/asm/proces= sor.h index 4a686f0e5dbf6..c0975815980c8 100644 --- a/arch/x86/include/asm/processor.h +++ b/arch/x86/include/asm/processor.h @@ -105,6 +105,24 @@ struct cpuinfo_topology { // Cache level topology IDs u32 llc_id; u32 l2c_id; + + // Hardware defined CPU-type + union { + u32 cpu_type; + struct { + // CPUID.1A.EAX[23-0] + u32 intel_native_model_id :24; + // CPUID.1A.EAX[31-24] + u32 intel_type :8; + }; + struct { + // CPUID 0x80000026.EBX + u32 amd_num_processors :16, + amd_power_eff_ranking :8, + amd_native_model_id :4, + amd_type :4; + }; + }; }; =20 struct cpuinfo_x86 { diff --git a/arch/x86/include/asm/topology.h b/arch/x86/include/asm/topolog= y.h index aef70336d6247..795619ea13346 100644 --- a/arch/x86/include/asm/topology.h +++ b/arch/x86/include/asm/topology.h @@ -114,6 +114,12 @@ enum x86_topology_domains { TOPO_MAX_DOMAIN, }; =20 +enum x86_topology_cpu_type { + TOPO_CPU_TYPE_PERFORMANCE, + TOPO_CPU_TYPE_EFFICIENCY, + TOPO_CPU_TYPE_UNKNOWN, +}; + struct x86_topology_system { unsigned int dom_shifts[TOPO_MAX_DOMAIN]; unsigned int dom_size[TOPO_MAX_DOMAIN]; @@ -149,6 +155,9 @@ extern unsigned int __max_threads_per_core; extern unsigned int __num_threads_per_package; extern unsigned int __num_cores_per_package; =20 +const char *get_topology_cpu_type_name(struct cpuinfo_x86 *c); +enum x86_topology_cpu_type get_topology_generic_cpu_type(struct cpuinfo_x8= 6 *c); + static inline unsigned int topology_max_packages(void) { return __max_logical_packages; diff --git a/arch/x86/kernel/cpu/debugfs.c b/arch/x86/kernel/cpu/debugfs.c index 3baf3e4358347..10719aba62768 100644 --- a/arch/x86/kernel/cpu/debugfs.c +++ b/arch/x86/kernel/cpu/debugfs.c @@ -22,6 +22,7 @@ static int cpu_debug_show(struct seq_file *m, void *p) seq_printf(m, "die_id: %u\n", c->topo.die_id); seq_printf(m, "cu_id: %u\n", c->topo.cu_id); seq_printf(m, "core_id: %u\n", c->topo.core_id); + seq_printf(m, "cpu_type: %s\n", get_topology_cpu_type_name(c)); seq_printf(m, "logical_pkg_id: %u\n", c->topo.logical_pkg_id); seq_printf(m, "logical_die_id: %u\n", c->topo.logical_die_id); seq_printf(m, "llc_id: %u\n", c->topo.llc_id); diff --git a/arch/x86/kernel/cpu/topology_amd.c b/arch/x86/kernel/cpu/topol= ogy_amd.c index 7d476fa697ca5..03b3c9c3a45e2 100644 --- a/arch/x86/kernel/cpu/topology_amd.c +++ b/arch/x86/kernel/cpu/topology_amd.c @@ -182,6 +182,9 @@ static void parse_topology_amd(struct topo_scan *tscan) if (cpu_feature_enabled(X86_FEATURE_TOPOEXT)) has_topoext =3D cpu_parse_topology_ext(tscan); =20 + if (cpu_feature_enabled(X86_FEATURE_AMD_HETEROGENEOUS_CORES)) + tscan->c->topo.cpu_type =3D cpuid_ebx(0x80000026); + if (!has_topoext && !parse_8000_0008(tscan)) return; =20 diff --git a/arch/x86/kernel/cpu/topology_common.c b/arch/x86/kernel/cpu/to= pology_common.c index 9a6069e7133c9..60d5d74189a30 100644 --- a/arch/x86/kernel/cpu/topology_common.c +++ b/arch/x86/kernel/cpu/topology_common.c @@ -3,6 +3,7 @@ =20 #include =20 +#include #include #include #include @@ -27,6 +28,36 @@ void topology_set_dom(struct topo_scan *tscan, enum x86_= topology_domains dom, } } =20 +enum x86_topology_cpu_type get_topology_generic_cpu_type(struct cpuinfo_x8= 6 *c) +{ + if (c->x86_vendor =3D=3D X86_VENDOR_INTEL) { + switch (c->topo.intel_type) { + case INTEL_CPU_TYPE_ATOM: return TOPO_CPU_TYPE_EFFICIENCY; + case INTEL_CPU_TYPE_CORE: return TOPO_CPU_TYPE_PERFORMANCE; + } + } + if (c->x86_vendor =3D=3D X86_VENDOR_AMD) { + switch (c->topo.amd_type) { + case 0: return TOPO_CPU_TYPE_PERFORMANCE; + case 1: return TOPO_CPU_TYPE_EFFICIENCY; + } + } + + return TOPO_CPU_TYPE_UNKNOWN; +} + +const char *get_topology_cpu_type_name(struct cpuinfo_x86 *c) +{ + switch (get_topology_generic_cpu_type(c)) { + case TOPO_CPU_TYPE_PERFORMANCE: + return "performance"; + case TOPO_CPU_TYPE_EFFICIENCY: + return "efficiency"; + default: + return "unknown"; + } +} + static unsigned int __maybe_unused parse_num_cores_legacy(struct cpuinfo_x= 86 *c) { struct { @@ -87,6 +118,7 @@ static void parse_topology(struct topo_scan *tscan, bool= early) .cu_id =3D 0xff, .llc_id =3D BAD_APICID, .l2c_id =3D BAD_APICID, + .cpu_type =3D TOPO_CPU_TYPE_UNKNOWN, }; struct cpuinfo_x86 *c =3D tscan->c; struct { @@ -132,6 +164,8 @@ static void parse_topology(struct topo_scan *tscan, boo= l early) case X86_VENDOR_INTEL: if (!IS_ENABLED(CONFIG_CPU_SUP_INTEL) || !cpu_parse_topology_ext(tscan)) parse_legacy(tscan); + if (c->cpuid_level >=3D 0x1a) + c->topo.cpu_type =3D cpuid_eax(0x1a); break; case X86_VENDOR_HYGON: if (IS_ENABLED(CONFIG_CPU_SUP_HYGON)) --=20 2.43.0