From b778ba5c868584a960628901482978560de43fd4 Mon Sep 17 00:00:00 2001 From: Borislav Petkov Date: Thu, 7 Jan 2021 13:23:34 +0100 Subject: [PATCH 01/11] x86/mce: Get rid of mcheck_intel_therm_init() mainline inclusion from mainline-5.12 commit 4f432e8bb15b352da72525144da025a46695968f category: feature bugzilla: https://gitee.com/openeuler/intel-kernel/issues/I5DSOL Intel_SIG: commit 4f432e8bb15b x86/mce: Get rid of mcheck_intel_therm_init(). Backport for Intel HFI (Hardware Feedback Interface) support ------------------------------------- Move the APIC_LVTTHMR read which needs to happen on the BSP, to intel_init_thermal(). One less boot dependency. No functional changes. Signed-off-by: Borislav Petkov Tested-by: Srinivas Pandruvada Link: https://lkml.kernel.org/r/20210201142704.12495-2-bp@alien8.de Signed-off-by: yingbao jia Signed-off-by: Jun Tian --- arch/x86/include/asm/mce.h | 6 ------ arch/x86/kernel/cpu/mce/core.c | 1 - arch/x86/kernel/cpu/mce/therm_throt.c | 15 ++++----------- 3 files changed, 4 insertions(+), 18 deletions(-) diff --git a/arch/x86/include/asm/mce.h b/arch/x86/include/asm/mce.h index 9b5ff423e939..4feed45f0438 100644 --- a/arch/x86/include/asm/mce.h +++ b/arch/x86/include/asm/mce.h @@ -299,12 +299,6 @@ extern int (*platform_thermal_package_notify)(__u64 msr_val); * callback has rate control */ extern bool (*platform_thermal_package_rate_control)(void); -#ifdef CONFIG_X86_THERMAL_VECTOR -extern void mcheck_intel_therm_init(void); -#else -static inline void mcheck_intel_therm_init(void) { } -#endif - /* * Used by APEI to report memory error via /dev/mcelog */ diff --git a/arch/x86/kernel/cpu/mce/core.c b/arch/x86/kernel/cpu/mce/core.c index 0ced8b250090..ed49a4abd20e 100644 --- a/arch/x86/kernel/cpu/mce/core.c +++ b/arch/x86/kernel/cpu/mce/core.c @@ -2231,7 +2231,6 @@ __setup("mce", mcheck_enable); int __init mcheck_init(void) { - mcheck_intel_therm_init(); mce_register_decode_chain(&early_nb); mce_register_decode_chain(&mce_uc_nb); mce_register_decode_chain(&mce_default_nb); diff --git a/arch/x86/kernel/cpu/mce/therm_throt.c b/arch/x86/kernel/cpu/mce/therm_throt.c index a7cd2d203ced..5b15d7cef1d1 100644 --- a/arch/x86/kernel/cpu/mce/therm_throt.c +++ b/arch/x86/kernel/cpu/mce/therm_throt.c @@ -633,17 +633,6 @@ static int intel_thermal_supported(struct cpuinfo_x86 *c) return 1; } -void __init mcheck_intel_therm_init(void) -{ - /* - * This function is only called on boot CPU. Save the init thermal - * LVT value on BSP and use that value to restore APs' thermal LVT - * entry BIOS programmed later - */ - if (intel_thermal_supported(&boot_cpu_data)) - lvtthmr_init = apic_read(APIC_LVTTHMR); -} - void intel_init_thermal(struct cpuinfo_x86 *c) { unsigned int cpu = smp_processor_id(); @@ -653,6 +642,10 @@ void intel_init_thermal(struct cpuinfo_x86 *c) if (!intel_thermal_supported(c)) return; + /* On the BSP? */ + if (c == &boot_cpu_data) + lvtthmr_init = apic_read(APIC_LVTTHMR); + /* * First check if its enabled already, in which case there might * be some SMM goo which handles it, so we can't even put a handler -- Gitee From 3042f430fab61ead14942ce4a39be12834f08a78 Mon Sep 17 00:00:00 2001 From: Borislav Petkov Date: Thu, 7 Jan 2021 13:29:05 +0100 Subject: [PATCH 02/11] thermal: Move therm_throt there from x86/mce mainline inclusion from mainline-5.12 commit 9223d0dccb8f8523754122f68316dd1a4f39f7f8 category: feature bugzilla: https://gitee.com/openeuler/intel-kernel/issues/I5DSOL Intel_SIG: commit 9223d0dccb8f thermal: Move therm_throt there from x86/mce. Backport for Intel HFI (Hardware Feedback Interface) support ------------------------------------- This functionality has nothing to do with MCE, move it to the thermal framework and untangle it from MCE. Requested-by: Peter Zijlstra Signed-off-by: Borislav Petkov Reviewed-by: Srinivas Pandruvada Tested-by: Srinivas Pandruvada Link: https://lkml.kernel.org/r/20210202121003.GD18075@zn.tnic Signed-off-by: yingbao jia Signed-off-by: Jun Tian --- arch/x86/Kconfig | 4 --- arch/x86/include/asm/mce.h | 16 ---------- arch/x86/include/asm/thermal.h | 13 ++++++++ arch/x86/kernel/cpu/intel.c | 3 ++ arch/x86/kernel/cpu/mce/Makefile | 2 -- arch/x86/kernel/cpu/mce/intel.c | 1 - arch/x86/kernel/irq.c | 21 ++++++++++++ drivers/thermal/intel/Kconfig | 4 +++ drivers/thermal/intel/Makefile | 1 + .../thermal/intel}/therm_throt.c | 32 ++++++------------- drivers/thermal/intel/thermal_interrupt.h | 15 +++++++++ drivers/thermal/intel/x86_pkg_temp_thermal.c | 4 +-- 12 files changed, 68 insertions(+), 48 deletions(-) create mode 100644 arch/x86/include/asm/thermal.h rename {arch/x86/kernel/cpu/mce => drivers/thermal/intel}/therm_throt.c (97%) create mode 100644 drivers/thermal/intel/thermal_interrupt.h diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig index 040fb77366dd..16683d531a00 100644 --- a/arch/x86/Kconfig +++ b/arch/x86/Kconfig @@ -1164,10 +1164,6 @@ config X86_MCE_INJECT If you don't know what a machine check is and you don't do kernel QA it is safe to say n. -config X86_THERMAL_VECTOR - def_bool y - depends on X86_MCE_INTEL - source "arch/x86/events/Kconfig" config X86_LEGACY_VM86 diff --git a/arch/x86/include/asm/mce.h b/arch/x86/include/asm/mce.h index 4feed45f0438..28c112695e92 100644 --- a/arch/x86/include/asm/mce.h +++ b/arch/x86/include/asm/mce.h @@ -283,22 +283,6 @@ extern void (*mce_threshold_vector)(void); /* Deferred error interrupt handler */ extern void (*deferred_error_int_vector)(void); -/* - * Thermal handler - */ - -void intel_init_thermal(struct cpuinfo_x86 *c); - -/* Interrupt Handler for core thermal thresholds */ -extern int (*platform_thermal_notify)(__u64 msr_val); - -/* Interrupt Handler for package thermal thresholds */ -extern int (*platform_thermal_package_notify)(__u64 msr_val); - -/* Callback support of rate control, return true, if - * callback has rate control */ -extern bool (*platform_thermal_package_rate_control)(void); - /* * Used by APEI to report memory error via /dev/mcelog */ diff --git a/arch/x86/include/asm/thermal.h b/arch/x86/include/asm/thermal.h new file mode 100644 index 000000000000..ddbdefd5b94f --- /dev/null +++ b/arch/x86/include/asm/thermal.h @@ -0,0 +1,13 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +#ifndef _ASM_X86_THERMAL_H +#define _ASM_X86_THERMAL_H + +#ifdef CONFIG_X86_THERMAL_VECTOR +void intel_init_thermal(struct cpuinfo_x86 *c); +bool x86_thermal_enabled(void); +void intel_thermal_interrupt(void); +#else +static inline void intel_init_thermal(struct cpuinfo_x86 *c) { } +#endif + +#endif /* _ASM_X86_THERMAL_H */ diff --git a/arch/x86/kernel/cpu/intel.c b/arch/x86/kernel/cpu/intel.c index 816fdbec795a..0e422a544835 100644 --- a/arch/x86/kernel/cpu/intel.c +++ b/arch/x86/kernel/cpu/intel.c @@ -24,6 +24,7 @@ #include #include #include +#include #ifdef CONFIG_X86_64 #include @@ -719,6 +720,8 @@ static void init_intel(struct cpuinfo_x86 *c) tsx_disable(); split_lock_init(); + + intel_init_thermal(c); } #ifdef CONFIG_X86_32 diff --git a/arch/x86/kernel/cpu/mce/Makefile b/arch/x86/kernel/cpu/mce/Makefile index 9f020c994154..015856abdbb1 100644 --- a/arch/x86/kernel/cpu/mce/Makefile +++ b/arch/x86/kernel/cpu/mce/Makefile @@ -9,8 +9,6 @@ obj-$(CONFIG_X86_MCE_THRESHOLD) += threshold.o mce-inject-y := inject.o obj-$(CONFIG_X86_MCE_INJECT) += mce-inject.o -obj-$(CONFIG_X86_THERMAL_VECTOR) += therm_throt.o - obj-$(CONFIG_ACPI_APEI) += apei.o obj-$(CONFIG_X86_MCELOG_LEGACY) += dev-mcelog.o diff --git a/arch/x86/kernel/cpu/mce/intel.c b/arch/x86/kernel/cpu/mce/intel.c index 24d45a1e214c..1adf67e0fcba 100644 --- a/arch/x86/kernel/cpu/mce/intel.c +++ b/arch/x86/kernel/cpu/mce/intel.c @@ -514,7 +514,6 @@ static void intel_ppin_init(struct cpuinfo_x86 *c) void mce_intel_feature_init(struct cpuinfo_x86 *c) { - intel_init_thermal(c); intel_init_cmci(); intel_init_lmce(); intel_ppin_init(c); diff --git a/arch/x86/kernel/irq.c b/arch/x86/kernel/irq.c index ce904c89c6c7..cb23373bffa8 100644 --- a/arch/x86/kernel/irq.c +++ b/arch/x86/kernel/irq.c @@ -21,6 +21,7 @@ #include #include #include +#include #define CREATE_TRACE_POINTS #include @@ -376,3 +377,23 @@ void fixup_irqs(void) } } #endif + +#ifdef CONFIG_X86_THERMAL_VECTOR +static void smp_thermal_vector(void) +{ + if (x86_thermal_enabled()) + intel_thermal_interrupt(); + else + pr_err("CPU%d: Unexpected LVT thermal interrupt!\n", + smp_processor_id()); +} + +DEFINE_IDTENTRY_SYSVEC(sysvec_thermal) +{ + trace_thermal_apic_entry(THERMAL_APIC_VECTOR); + inc_irq_stat(irq_thermal_count); + smp_thermal_vector(); + trace_thermal_apic_exit(THERMAL_APIC_VECTOR); + ack_APIC_irq(); +} +#endif diff --git a/drivers/thermal/intel/Kconfig b/drivers/thermal/intel/Kconfig index 8025b21f43fa..ce4f59213c7a 100644 --- a/drivers/thermal/intel/Kconfig +++ b/drivers/thermal/intel/Kconfig @@ -8,6 +8,10 @@ config INTEL_POWERCLAMP enforce idle time which results in more package C-state residency. The user interface is exposed via generic thermal framework. +config X86_THERMAL_VECTOR + def_bool y + depends on X86 && CPU_SUP_INTEL && X86_LOCAL_APIC + config X86_PKG_TEMP_THERMAL tristate "X86 package temperature thermal driver" depends on X86_THERMAL_VECTOR diff --git a/drivers/thermal/intel/Makefile b/drivers/thermal/intel/Makefile index 0d9736ced5d4..ff2ad30ef397 100644 --- a/drivers/thermal/intel/Makefile +++ b/drivers/thermal/intel/Makefile @@ -10,3 +10,4 @@ obj-$(CONFIG_INTEL_QUARK_DTS_THERMAL) += intel_quark_dts_thermal.o obj-$(CONFIG_INT340X_THERMAL) += int340x_thermal/ obj-$(CONFIG_INTEL_BXT_PMIC_THERMAL) += intel_bxt_pmic_thermal.o obj-$(CONFIG_INTEL_PCH_THERMAL) += intel_pch_thermal.o +obj-$(CONFIG_X86_THERMAL_VECTOR) += therm_throt.o diff --git a/arch/x86/kernel/cpu/mce/therm_throt.c b/drivers/thermal/intel/therm_throt.c similarity index 97% rename from arch/x86/kernel/cpu/mce/therm_throt.c rename to drivers/thermal/intel/therm_throt.c index 5b15d7cef1d1..f8e882592ba5 100644 --- a/arch/x86/kernel/cpu/mce/therm_throt.c +++ b/drivers/thermal/intel/therm_throt.c @@ -26,13 +26,13 @@ #include #include +#include #include #include -#include +#include #include -#include -#include "internal.h" +#include "thermal_interrupt.h" /* How long to wait between reporting thermal events */ #define CHECK_INTERVAL (300 * HZ) @@ -570,7 +570,7 @@ static void notify_thresholds(__u64 msr_val) } /* Thermal transition interrupt handler */ -static void intel_thermal_interrupt(void) +void intel_thermal_interrupt(void) { __u64 msr_val; @@ -606,23 +606,6 @@ static void intel_thermal_interrupt(void) } } -static void unexpected_thermal_interrupt(void) -{ - pr_err("CPU%d: Unexpected LVT thermal interrupt!\n", - smp_processor_id()); -} - -static void (*smp_thermal_vector)(void) = unexpected_thermal_interrupt; - -DEFINE_IDTENTRY_SYSVEC(sysvec_thermal) -{ - trace_thermal_apic_entry(THERMAL_APIC_VECTOR); - inc_irq_stat(irq_thermal_count); - smp_thermal_vector(); - trace_thermal_apic_exit(THERMAL_APIC_VECTOR); - ack_APIC_irq(); -} - /* Thermal monitoring depends on APIC, ACPI and clock modulation */ static int intel_thermal_supported(struct cpuinfo_x86 *c) { @@ -633,6 +616,11 @@ static int intel_thermal_supported(struct cpuinfo_x86 *c) return 1; } +bool x86_thermal_enabled(void) +{ + return atomic_read(&therm_throt_en); +} + void intel_init_thermal(struct cpuinfo_x86 *c) { unsigned int cpu = smp_processor_id(); @@ -719,8 +707,6 @@ void intel_init_thermal(struct cpuinfo_x86 *c) | PACKAGE_THERM_INT_HIGH_ENABLE), h); } - smp_thermal_vector = intel_thermal_interrupt; - rdmsr(MSR_IA32_MISC_ENABLE, l, h); wrmsr(MSR_IA32_MISC_ENABLE, l | MSR_IA32_MISC_ENABLE_TM1, h); diff --git a/drivers/thermal/intel/thermal_interrupt.h b/drivers/thermal/intel/thermal_interrupt.h new file mode 100644 index 000000000000..53f427bb58dc --- /dev/null +++ b/drivers/thermal/intel/thermal_interrupt.h @@ -0,0 +1,15 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +#ifndef _INTEL_THERMAL_INTERRUPT_H +#define _INTEL_THERMAL_INTERRUPT_H + +/* Interrupt Handler for package thermal thresholds */ +extern int (*platform_thermal_package_notify)(__u64 msr_val); + +/* Interrupt Handler for core thermal thresholds */ +extern int (*platform_thermal_notify)(__u64 msr_val); + +/* Callback support of rate control, return true, if + * callback has rate control */ +extern bool (*platform_thermal_package_rate_control)(void); + +#endif /* _INTEL_THERMAL_INTERRUPT_H */ diff --git a/drivers/thermal/intel/x86_pkg_temp_thermal.c b/drivers/thermal/intel/x86_pkg_temp_thermal.c index 4f5d97329ee3..e734929b2cd0 100644 --- a/drivers/thermal/intel/x86_pkg_temp_thermal.c +++ b/drivers/thermal/intel/x86_pkg_temp_thermal.c @@ -17,9 +17,9 @@ #include #include #include -#include -#include +#include +#include "thermal_interrupt.h" /* * Rate control delay: Idea is to introduce denounce effect * This should be long enough to avoid reduce events, when -- Gitee From 967320d3fae4cafac795c7b457eff40953eb6d94 Mon Sep 17 00:00:00 2001 From: Ricardo Neri Date: Thu, 27 Jan 2022 11:34:49 -0800 Subject: [PATCH 03/11] x86/cpu: Add definitions for the Intel Hardware Feedback Interface mainline inclusion from mainline-5.18 commit 7b8f40b3de75c971a4e5f9308b06deb59118dbac category: feature bugzilla: https://gitee.com/openeuler/intel-kernel/issues/I5DSOL Intel_SIG: commit 7b8f40b3de75 x86/cpu: Add definitions for the Intel Hardware Feedback Interface. Backport for Intel HFI (Hardware Feedback Interface) support ------------------------------------- Add the CPUID feature bit and the model-specific registers needed to identify and configure the Intel Hardware Feedback Interface. Acked-by: Borislav Petkov Signed-off-by: Ricardo Neri Signed-off-by: Rafael J. Wysocki Signed-off-by: yingbao jia Signed-off-by: Jun Tian --- arch/x86/include/asm/cpufeatures.h | 1 + arch/x86/include/asm/msr-index.h | 6 ++++++ 2 files changed, 7 insertions(+) diff --git a/arch/x86/include/asm/cpufeatures.h b/arch/x86/include/asm/cpufeatures.h index 4da419226377..9e61ccbac3c0 100644 --- a/arch/x86/include/asm/cpufeatures.h +++ b/arch/x86/include/asm/cpufeatures.h @@ -321,6 +321,7 @@ #define X86_FEATURE_HWP_ACT_WINDOW (14*32+ 9) /* HWP Activity Window */ #define X86_FEATURE_HWP_EPP (14*32+10) /* HWP Energy Perf. Preference */ #define X86_FEATURE_HWP_PKG_REQ (14*32+11) /* HWP Package Level Request */ +#define X86_FEATURE_HFI (14*32+19) /* Hardware Feedback Interface */ /* AMD SVM Feature Identification, CPUID level 0x8000000a (EDX), word 15 */ #define X86_FEATURE_NPT (15*32+ 0) /* Nested Page Table support */ diff --git a/arch/x86/include/asm/msr-index.h b/arch/x86/include/asm/msr-index.h index 2b0af5eb5131..2f0ca77d24bc 100644 --- a/arch/x86/include/asm/msr-index.h +++ b/arch/x86/include/asm/msr-index.h @@ -706,12 +706,14 @@ #define PACKAGE_THERM_STATUS_PROCHOT (1 << 0) #define PACKAGE_THERM_STATUS_POWER_LIMIT (1 << 10) +#define PACKAGE_THERM_STATUS_HFI_UPDATED (1 << 26) #define MSR_IA32_PACKAGE_THERM_INTERRUPT 0x000001b2 #define PACKAGE_THERM_INT_HIGH_ENABLE (1 << 0) #define PACKAGE_THERM_INT_LOW_ENABLE (1 << 1) #define PACKAGE_THERM_INT_PLN_ENABLE (1 << 24) +#define PACKAGE_THERM_INT_HFI_ENABLE (1 << 25) /* Thermal Thresholds Support */ #define THERM_INT_THRESHOLD0_ENABLE (1 << 15) @@ -956,4 +958,8 @@ #define MSR_VM_IGNNE 0xc0010115 #define MSR_VM_HSAVE_PA 0xc0010117 +/* Hardware Feedback Interface */ +#define MSR_IA32_HW_FEEDBACK_PTR 0x17d0 +#define MSR_IA32_HW_FEEDBACK_CONFIG 0x17d1 + #endif /* _ASM_X86_MSR_INDEX_H */ -- Gitee From cd073e4711bf1e7a723c5d951c65395b44bde852 Mon Sep 17 00:00:00 2001 From: Ricardo Neri Date: Thu, 27 Jan 2022 11:34:50 -0800 Subject: [PATCH 04/11] thermal: intel: hfi: Minimally initialize the Hardware Feedback Interface mainline inclusion from mainline-5.18 commit 1cb19cabeb0e187b6c244d0da73d27f7432c40dc category: feature bugzilla: https://gitee.com/openeuler/intel-kernel/issues/I5DSOL Intel_SIG: commit 1cb19cabeb0e thermal: intel: hfi: Minimally initialize the Hardware Feedback Interface. Backport for Intel HFI (Hardware Feedback Interface) support ------------------------------------- The Intel Hardware Feedback Interface provides guidance to the operating system about the performance and energy efficiency capabilities of each CPU in the system. Capabilities are numbers between 0 and 255 where a higher number represents a higher capability. For each CPU, energy efficiency and performance are reported as separate capabilities. Hardware computes these capabilities based on the operating conditions of the system such as power and thermal limits. These capabilities are shared with the operating system in a table resident in memory. Each package in the system has its own HFI instance. Every logical CPU in the package is represented in the table. More than one logical CPUs may be represented in a single table entry. When the hardware updates the table, it generates a package-level thermal interrupt. The size and format of the HFI table depend on the supported features and can only be determined at runtime. To minimally initialize the HFI, parse its features and allocate one instance per package of a data structure with the necessary parameters to read and navigate a local copy (i.e., owned by the driver) of individual HFI tables. A subsequent changeset will provide per-CPU initialization and interrupt handling. Reviewed-by: Len Brown Co-developed by: Aubrey Li Signed-off-by: Aubrey Li Signed-off-by: Ricardo Neri Signed-off-by: Rafael J. Wysocki Signed-off-by: yingbao jia Signed-off-by: Jun Tian --- drivers/thermal/intel/Kconfig | 12 ++ drivers/thermal/intel/Makefile | 1 + drivers/thermal/intel/intel_hfi.c | 180 ++++++++++++++++++++++++++++ drivers/thermal/intel/intel_hfi.h | 11 ++ drivers/thermal/intel/therm_throt.c | 3 + 5 files changed, 207 insertions(+) create mode 100644 drivers/thermal/intel/intel_hfi.c create mode 100644 drivers/thermal/intel/intel_hfi.h diff --git a/drivers/thermal/intel/Kconfig b/drivers/thermal/intel/Kconfig index ce4f59213c7a..26aea864aaca 100644 --- a/drivers/thermal/intel/Kconfig +++ b/drivers/thermal/intel/Kconfig @@ -79,3 +79,15 @@ config INTEL_PCH_THERMAL Enable this to support thermal reporting on certain intel PCHs. Thermal reporting device will provide temperature reading, programmable trip points and other information. + +config INTEL_HFI_THERMAL + bool "Intel Hardware Feedback Interface" + depends on CPU_SUP_INTEL + depends on X86_THERMAL_VECTOR + help + Select this option to enable the Hardware Feedback Interface. If + selected, hardware provides guidance to the operating system on + the performance and energy efficiency capabilities of each CPU. + These capabilities may change as a result of changes in the operating + conditions of the system such power and thermal limits. If selected, + the kernel relays updates in CPUs' capabilities to userspace. diff --git a/drivers/thermal/intel/Makefile b/drivers/thermal/intel/Makefile index ff2ad30ef397..ece3888f30af 100644 --- a/drivers/thermal/intel/Makefile +++ b/drivers/thermal/intel/Makefile @@ -11,3 +11,4 @@ obj-$(CONFIG_INT340X_THERMAL) += int340x_thermal/ obj-$(CONFIG_INTEL_BXT_PMIC_THERMAL) += intel_bxt_pmic_thermal.o obj-$(CONFIG_INTEL_PCH_THERMAL) += intel_pch_thermal.o obj-$(CONFIG_X86_THERMAL_VECTOR) += therm_throt.o +obj-$(CONFIG_INTEL_HFI_THERMAL) += intel_hfi.o diff --git a/drivers/thermal/intel/intel_hfi.c b/drivers/thermal/intel/intel_hfi.c new file mode 100644 index 000000000000..9ea8256cf9ae --- /dev/null +++ b/drivers/thermal/intel/intel_hfi.c @@ -0,0 +1,180 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Hardware Feedback Interface Driver + * + * Copyright (c) 2021, Intel Corporation. + * + * Authors: Aubrey Li + * Ricardo Neri + * + * + * The Hardware Feedback Interface provides a performance and energy efficiency + * capability information for each CPU in the system. Depending on the processor + * model, hardware may periodically update these capabilities as a result of + * changes in the operating conditions (e.g., power limits or thermal + * constraints). On other processor models, there is a single HFI update + * at boot. + * + * This file provides functionality to process HFI updates and relay these + * updates to userspace. + */ + +#define pr_fmt(fmt) "intel-hfi: " fmt + +#include +#include +#include +#include +#include +#include + +#include "intel_hfi.h" + +/* CPUID detection and enumeration definitions for HFI */ + +#define CPUID_HFI_LEAF 6 + +union hfi_capabilities { + struct { + u8 performance:1; + u8 energy_efficiency:1; + u8 __reserved:6; + } split; + u8 bits; +}; + +union cpuid6_edx { + struct { + union hfi_capabilities capabilities; + u32 table_pages:4; + u32 __reserved:4; + s32 index:16; + } split; + u32 full; +}; + +/** + * struct hfi_cpu_data - HFI capabilities per CPU + * @perf_cap: Performance capability + * @ee_cap: Energy efficiency capability + * + * Capabilities of a logical processor in the HFI table. These capabilities are + * unitless. + */ +struct hfi_cpu_data { + u8 perf_cap; + u8 ee_cap; +} __packed; + +/** + * struct hfi_hdr - Header of the HFI table + * @perf_updated: Hardware updated performance capabilities + * @ee_updated: Hardware updated energy efficiency capabilities + * + * Properties of the data in an HFI table. + */ +struct hfi_hdr { + u8 perf_updated; + u8 ee_updated; +} __packed; + +/** + * struct hfi_instance - Representation of an HFI instance (i.e., a table) + * @local_table: Base of the local copy of the HFI table + * @timestamp: Timestamp of the last update of the local table. + * Located at the base of the local table. + * @hdr: Base address of the header of the local table + * @data: Base address of the data of the local table + * + * A set of parameters to parse and navigate a specific HFI table. + */ +struct hfi_instance { + union { + void *local_table; + u64 *timestamp; + }; + void *hdr; + void *data; +}; + +/** + * struct hfi_features - Supported HFI features + * @nr_table_pages: Size of the HFI table in 4KB pages + * @cpu_stride: Stride size to locate the capability data of a logical + * processor within the table (i.e., row stride) + * @hdr_size: Size of the table header + * + * Parameters and supported features that are common to all HFI instances + */ +struct hfi_features { + unsigned int nr_table_pages; + unsigned int cpu_stride; + unsigned int hdr_size; +}; + +static int max_hfi_instances; +static struct hfi_instance *hfi_instances; + +static struct hfi_features hfi_features; + +static __init int hfi_parse_features(void) +{ + unsigned int nr_capabilities; + union cpuid6_edx edx; + + if (!boot_cpu_has(X86_FEATURE_HFI)) + return -ENODEV; + + /* + * If we are here we know that CPUID_HFI_LEAF exists. Parse the + * supported capabilities and the size of the HFI table. + */ + edx.full = cpuid_edx(CPUID_HFI_LEAF); + + if (!edx.split.capabilities.split.performance) { + pr_debug("Performance reporting not supported! Not using HFI\n"); + return -ENODEV; + } + + /* + * The number of supported capabilities determines the number of + * columns in the HFI table. Exclude the reserved bits. + */ + edx.split.capabilities.split.__reserved = 0; + nr_capabilities = hweight8(edx.split.capabilities.bits); + + /* The number of 4KB pages required by the table */ + hfi_features.nr_table_pages = edx.split.table_pages + 1; + + /* + * The header contains change indications for each supported feature. + * The size of the table header is rounded up to be a multiple of 8 + * bytes. + */ + hfi_features.hdr_size = DIV_ROUND_UP(nr_capabilities, 8) * 8; + + /* + * Data of each logical processor is also rounded up to be a multiple + * of 8 bytes. + */ + hfi_features.cpu_stride = DIV_ROUND_UP(nr_capabilities, 8) * 8; + + return 0; +} + +void __init intel_hfi_init(void) +{ + if (hfi_parse_features()) + return; + + /* There is one HFI instance per die/package. */ + max_hfi_instances = topology_max_packages() * + topology_max_die_per_package(); + + /* + * This allocation may fail. CPU hotplug callbacks must check + * for a null pointer. + */ + hfi_instances = kcalloc(max_hfi_instances, sizeof(*hfi_instances), + GFP_KERNEL); +} diff --git a/drivers/thermal/intel/intel_hfi.h b/drivers/thermal/intel/intel_hfi.h new file mode 100644 index 000000000000..05f748b48a4e --- /dev/null +++ b/drivers/thermal/intel/intel_hfi.h @@ -0,0 +1,11 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +#ifndef _INTEL_HFI_H +#define _INTEL_HFI_H + +#if defined(CONFIG_INTEL_HFI_THERMAL) +void __init intel_hfi_init(void); +#else +static inline void intel_hfi_init(void) { } +#endif /* CONFIG_INTEL_HFI_THERMAL */ + +#endif /* _INTEL_HFI_H */ diff --git a/drivers/thermal/intel/therm_throt.c b/drivers/thermal/intel/therm_throt.c index f8e882592ba5..9d26e35106a7 100644 --- a/drivers/thermal/intel/therm_throt.c +++ b/drivers/thermal/intel/therm_throt.c @@ -32,6 +32,7 @@ #include #include +#include "intel_hfi.h" #include "thermal_interrupt.h" /* How long to wait between reporting thermal events */ @@ -509,6 +510,8 @@ static __init int thermal_throttle_init_device(void) if (!atomic_read(&therm_throt_en)) return 0; + intel_hfi_init(); + ret = cpuhp_setup_state(CPUHP_AP_ONLINE_DYN, "x86/therm:online", thermal_throttle_online, thermal_throttle_offline); -- Gitee From 55affa7a8345f4b8d74407b00c0223bf7183f62a Mon Sep 17 00:00:00 2001 From: Ricardo Neri Date: Thu, 27 Jan 2022 11:34:51 -0800 Subject: [PATCH 05/11] thermal: intel: hfi: Handle CPU hotplug events mainline inclusion from mainline-5.18 commit 2d74e6319abe278981e79166b6c2d0c3ed39b1ae category: feature bugzilla: https://gitee.com/openeuler/intel-kernel/issues/I5DSOL Intel_SIG: commit 2d74e6319abe thermal: intel: hfi: Handle CPU hotplug events. Backport for Intel HFI (Hardware Feedback Interface) support ------------------------------------- All CPUs in a package are represented in an HFI table. There exists an HFI table per package. Thus, CPUs in a package need to coordinate to initialize and access the table. Do such coordination during CPU hotplug. Use the first CPU to come online in a package to initialize the HFI instance and the data structure representing it. Other CPUs in the same package need only to register or unregister themselves in that data structure. The HFI depends on both the package-level thermal management and the local APIC thermal local vector. Thus, to ensure that a CPU coming online has an associated HFI instance when the hardware issues an HFI event, enable the HFI only after having enabled the local APIC thermal vector. The thermal throttle driver takes care of the needed package-level initialization. Reviewed-by: Len Brown Signed-off-by: Ricardo Neri Signed-off-by: Rafael J. Wysocki Signed-off-by: yingbao jia Signed-off-by: Jun Tian --- drivers/thermal/intel/intel_hfi.c | 205 ++++++++++++++++++++++++++++ drivers/thermal/intel/intel_hfi.h | 4 + drivers/thermal/intel/therm_throt.c | 9 ++ 3 files changed, 218 insertions(+) diff --git a/drivers/thermal/intel/intel_hfi.c b/drivers/thermal/intel/intel_hfi.c index 9ea8256cf9ae..8cac7ee6a20f 100644 --- a/drivers/thermal/intel/intel_hfi.c +++ b/drivers/thermal/intel/intel_hfi.c @@ -23,13 +23,23 @@ #include #include +#include +#include +#include +#include +#include #include #include #include #include +#include + #include "intel_hfi.h" +/* Hardware Feedback Interface MSR configuration bits */ +#define HW_FEEDBACK_PTR_VALID_BIT BIT(0) + /* CPUID detection and enumeration definitions for HFI */ #define CPUID_HFI_LEAF 6 @@ -85,6 +95,8 @@ struct hfi_hdr { * Located at the base of the local table. * @hdr: Base address of the header of the local table * @data: Base address of the data of the local table + * @cpus: CPUs represented in this HFI table instance + * @hw_table: Pointer to the HFI table of this instance * * A set of parameters to parse and navigate a specific HFI table. */ @@ -95,6 +107,8 @@ struct hfi_instance { }; void *hdr; void *data; + cpumask_var_t cpus; + void *hw_table; }; /** @@ -112,10 +126,179 @@ struct hfi_features { unsigned int hdr_size; }; +/** + * struct hfi_cpu_info - Per-CPU attributes to consume HFI data + * @index: Row of this CPU in its HFI table + * @hfi_instance: Attributes of the HFI table to which this CPU belongs + * + * Parameters to link a logical processor to an HFI table and a row within it. + */ +struct hfi_cpu_info { + s16 index; + struct hfi_instance *hfi_instance; +}; + +static DEFINE_PER_CPU(struct hfi_cpu_info, hfi_cpu_info) = { .index = -1 }; + static int max_hfi_instances; static struct hfi_instance *hfi_instances; static struct hfi_features hfi_features; +static DEFINE_MUTEX(hfi_instance_lock); + +static void init_hfi_cpu_index(struct hfi_cpu_info *info) +{ + union cpuid6_edx edx; + + /* Do not re-read @cpu's index if it has already been initialized. */ + if (info->index > -1) + return; + + edx.full = cpuid_edx(CPUID_HFI_LEAF); + info->index = edx.split.index; +} + +/* + * The format of the HFI table depends on the number of capabilities that the + * hardware supports. Keep a data structure to navigate the table. + */ +static void init_hfi_instance(struct hfi_instance *hfi_instance) +{ + /* The HFI header is below the time-stamp. */ + hfi_instance->hdr = hfi_instance->local_table + + sizeof(*hfi_instance->timestamp); + + /* The HFI data starts below the header. */ + hfi_instance->data = hfi_instance->hdr + hfi_features.hdr_size; +} + +/** + * intel_hfi_online() - Enable HFI on @cpu + * @cpu: CPU in which the HFI will be enabled + * + * Enable the HFI to be used in @cpu. The HFI is enabled at the die/package + * level. The first CPU in the die/package to come online does the full HFI + * initialization. Subsequent CPUs will just link themselves to the HFI + * instance of their die/package. + * + * This function is called before enabling the thermal vector in the local APIC + * in order to ensure that @cpu has an associated HFI instance when it receives + * an HFI event. + */ +void intel_hfi_online(unsigned int cpu) +{ + struct hfi_instance *hfi_instance; + struct hfi_cpu_info *info; + phys_addr_t hw_table_pa; + u64 msr_val; + u16 die_id; + + /* Nothing to do if hfi_instances are missing. */ + if (!hfi_instances) + return; + + /* + * Link @cpu to the HFI instance of its package/die. It does not + * matter whether the instance has been initialized. + */ + info = &per_cpu(hfi_cpu_info, cpu); + die_id = topology_logical_die_id(cpu); + hfi_instance = info->hfi_instance; + if (!hfi_instance) { + if (die_id < 0 || die_id >= max_hfi_instances) + return; + + hfi_instance = &hfi_instances[die_id]; + info->hfi_instance = hfi_instance; + } + + init_hfi_cpu_index(info); + + /* + * Now check if the HFI instance of the package/die of @cpu has been + * initialized (by checking its header). In such case, all we have to + * do is to add @cpu to this instance's cpumask. + */ + mutex_lock(&hfi_instance_lock); + if (hfi_instance->hdr) { + cpumask_set_cpu(cpu, hfi_instance->cpus); + goto unlock; + } + + /* + * Hardware is programmed with the physical address of the first page + * frame of the table. Hence, the allocated memory must be page-aligned. + */ + hfi_instance->hw_table = alloc_pages_exact(hfi_features.nr_table_pages, + GFP_KERNEL | __GFP_ZERO); + if (!hfi_instance->hw_table) + goto unlock; + + hw_table_pa = virt_to_phys(hfi_instance->hw_table); + + /* + * Allocate memory to keep a local copy of the table that + * hardware generates. + */ + hfi_instance->local_table = kzalloc(hfi_features.nr_table_pages << PAGE_SHIFT, + GFP_KERNEL); + if (!hfi_instance->local_table) + goto free_hw_table; + + /* + * Program the address of the feedback table of this die/package. On + * some processors, hardware remembers the old address of the HFI table + * even after having been reprogrammed and re-enabled. Thus, do not free + * the pages allocated for the table or reprogram the hardware with a + * new base address. Namely, program the hardware only once. + */ + msr_val = hw_table_pa | HW_FEEDBACK_PTR_VALID_BIT; + wrmsrl(MSR_IA32_HW_FEEDBACK_PTR, msr_val); + + init_hfi_instance(hfi_instance); + + cpumask_set_cpu(cpu, hfi_instance->cpus); + +unlock: + mutex_unlock(&hfi_instance_lock); + return; + +free_hw_table: + free_pages_exact(hfi_instance->hw_table, hfi_features.nr_table_pages); + goto unlock; +} + +/** + * intel_hfi_offline() - Disable HFI on @cpu + * @cpu: CPU in which the HFI will be disabled + * + * Remove @cpu from those covered by its HFI instance. + * + * On some processors, hardware remembers previous programming settings even + * after being reprogrammed. Thus, keep HFI enabled even if all CPUs in the + * die/package of @cpu are offline. See note in intel_hfi_online(). + */ +void intel_hfi_offline(unsigned int cpu) +{ + struct hfi_cpu_info *info = &per_cpu(hfi_cpu_info, cpu); + struct hfi_instance *hfi_instance; + + /* + * Check if @cpu as an associated, initialized (i.e., with a non-NULL + * header). Also, HFI instances are only initialized if X86_FEATURE_HFI + * is present. + */ + hfi_instance = info->hfi_instance; + if (!hfi_instance) + return; + + if (!hfi_instance->hdr) + return; + + mutex_lock(&hfi_instance_lock); + cpumask_clear_cpu(cpu, hfi_instance->cpus); + mutex_unlock(&hfi_instance_lock); +} static __init int hfi_parse_features(void) { @@ -164,6 +347,9 @@ static __init int hfi_parse_features(void) void __init intel_hfi_init(void) { + struct hfi_instance *hfi_instance; + int i, j; + if (hfi_parse_features()) return; @@ -177,4 +363,23 @@ void __init intel_hfi_init(void) */ hfi_instances = kcalloc(max_hfi_instances, sizeof(*hfi_instances), GFP_KERNEL); + if (!hfi_instances) + return; + + for (i = 0; i < max_hfi_instances; i++) { + hfi_instance = &hfi_instances[i]; + if (!zalloc_cpumask_var(&hfi_instance->cpus, GFP_KERNEL)) + goto err_nomem; + } + + return; + +err_nomem: + for (j = 0; j < i; ++j) { + hfi_instance = &hfi_instances[j]; + free_cpumask_var(hfi_instance->cpus); + } + + kfree(hfi_instances); + hfi_instances = NULL; } diff --git a/drivers/thermal/intel/intel_hfi.h b/drivers/thermal/intel/intel_hfi.h index 05f748b48a4e..56c6b2d75202 100644 --- a/drivers/thermal/intel/intel_hfi.h +++ b/drivers/thermal/intel/intel_hfi.h @@ -4,8 +4,12 @@ #if defined(CONFIG_INTEL_HFI_THERMAL) void __init intel_hfi_init(void); +void intel_hfi_online(unsigned int cpu); +void intel_hfi_offline(unsigned int cpu); #else static inline void intel_hfi_init(void) { } +static inline void intel_hfi_online(unsigned int cpu) { } +static inline void intel_hfi_offline(unsigned int cpu) { } #endif /* CONFIG_INTEL_HFI_THERMAL */ #endif /* _INTEL_HFI_H */ diff --git a/drivers/thermal/intel/therm_throt.c b/drivers/thermal/intel/therm_throt.c index 9d26e35106a7..e4f95cf06b82 100644 --- a/drivers/thermal/intel/therm_throt.c +++ b/drivers/thermal/intel/therm_throt.c @@ -476,6 +476,13 @@ static int thermal_throttle_online(unsigned int cpu) INIT_DELAYED_WORK(&state->package_throttle.therm_work, throttle_active_work); INIT_DELAYED_WORK(&state->core_throttle.therm_work, throttle_active_work); + /* + * The first CPU coming online will enable the HFI. Usually this causes + * hardware to issue an HFI thermal interrupt. Such interrupt will reach + * the CPU once we enable the thermal vector in the local APIC. + */ + intel_hfi_online(cpu); + /* Unmask the thermal vector after the above workqueues are initialized. */ l = apic_read(APIC_LVTTHMR); apic_write(APIC_LVTTHMR, l & ~APIC_LVT_MASKED); @@ -493,6 +500,8 @@ static int thermal_throttle_offline(unsigned int cpu) l = apic_read(APIC_LVTTHMR); apic_write(APIC_LVTTHMR, l | APIC_LVT_MASKED); + intel_hfi_offline(cpu); + cancel_delayed_work_sync(&state->package_throttle.therm_work); cancel_delayed_work_sync(&state->core_throttle.therm_work); -- Gitee From 02091d14394d14819544c301e8ec0c6103efad89 Mon Sep 17 00:00:00 2001 From: Ricardo Neri Date: Thu, 27 Jan 2022 11:34:48 -0800 Subject: [PATCH 06/11] x86/Documentation: Describe the Intel Hardware Feedback Interface mainline inclusion from mainline-5.18 commit 4a960e8941bd59fe20f8f774de371f40f222a0c7 category: feature bugzilla: https://gitee.com/openeuler/intel-kernel/issues/I5DSOL Intel_SIG: commit 4a960e8941bd x86/Documentation: Describe the Intel Hardware Feedback Interface. Backport for Intel HFI (Hardware Feedback Interface) support ------------------------------------- Start a documentation file to describe the purpose and operation of Intel's Hardware Feedback Interface. Describe how this interface is used in Linux to relay performance and energy efficiency updates to userspace. Reviewed-by: Len Brown Suggested-by: Srinivas Pandruvada Signed-off-by: Ricardo Neri Signed-off-by: Rafael J. Wysocki Signed-off-by: yingbao jia Signed-off-by: Jun Tian --- Documentation/x86/index.rst | 1 + Documentation/x86/intel-hfi.rst | 72 +++++++++++++++++++++++++++++++++ 2 files changed, 73 insertions(+) create mode 100644 Documentation/x86/intel-hfi.rst diff --git a/Documentation/x86/index.rst b/Documentation/x86/index.rst index 647a570d4931..6832df92f084 100644 --- a/Documentation/x86/index.rst +++ b/Documentation/x86/index.rst @@ -21,6 +21,7 @@ x86-specific Documentation tlb mtrr pat + intel-hfi intel-iommu intel_txt amd-memory-encryption diff --git a/Documentation/x86/intel-hfi.rst b/Documentation/x86/intel-hfi.rst new file mode 100644 index 000000000000..49dea58ea4fb --- /dev/null +++ b/Documentation/x86/intel-hfi.rst @@ -0,0 +1,72 @@ +.. SPDX-License-Identifier: GPL-2.0 + +============================================================ +Hardware-Feedback Interface for scheduling on Intel Hardware +============================================================ + +Overview +-------- + +Intel has described the Hardware Feedback Interface (HFI) in the Intel 64 and +IA-32 Architectures Software Developer's Manual (Intel SDM) Volume 3 Section +14.6 [1]_. + +The HFI gives the operating system a performance and energy efficiency +capability data for each CPU in the system. Linux can use the information from +the HFI to influence task placement decisions. + +The Hardware Feedback Interface +------------------------------- + +The Hardware Feedback Interface provides to the operating system information +about the performance and energy efficiency of each CPU in the system. Each +capability is given as a unit-less quantity in the range [0-255]. Higher values +indicate higher capability. Energy efficiency and performance are reported in +separate capabilities. Even though on some systems these two metrics may be +related, they are specified as independent capabilities in the Intel SDM. + +These capabilities may change at runtime as a result of changes in the +operating conditions of the system or the action of external factors. The rate +at which these capabilities are updated is specific to each processor model. On +some models, capabilities are set at boot time and never change. On others, +capabilities may change every tens of milliseconds. For instance, a remote +mechanism may be used to lower Thermal Design Power. Such change can be +reflected in the HFI. Likewise, if the system needs to be throttled due to +excessive heat, the HFI may reflect reduced performance on specific CPUs. + +The kernel or a userspace policy daemon can use these capabilities to modify +task placement decisions. For instance, if either the performance or energy +capabilities of a given logical processor becomes zero, it is an indication that +the hardware recommends to the operating system to not schedule any tasks on +that processor for performance or energy efficiency reasons, respectively. + +Implementation details for Linux +-------------------------------- + +The infrastructure to handle thermal event interrupts has two parts. In the +Local Vector Table of a CPU's local APIC, there exists a register for the +Thermal Monitor Register. This register controls how interrupts are delivered +to a CPU when the thermal monitor generates and interrupt. Further details +can be found in the Intel SDM Vol. 3 Section 10.5 [1]_. + +The thermal monitor may generate interrupts per CPU or per package. The HFI +generates package-level interrupts. This monitor is configured and initialized +via a set of machine-specific registers. Specifically, the HFI interrupt and +status are controlled via designated bits in the IA32_PACKAGE_THERM_INTERRUPT +and IA32_PACKAGE_THERM_STATUS registers, respectively. There exists one HFI +table per package. Further details can be found in the Intel SDM Vol. 3 +Section 14.9 [1]_. + +The hardware issues an HFI interrupt after updating the HFI table and is ready +for the operating system to consume it. CPUs receive such interrupt via the +thermal entry in the Local APIC's Local Vector Table. + +When servicing such interrupt, the HFI driver parses the updated table and +relays the update to userspace using the thermal notification framework. Given +that there may be many HFI updates every second, the updates relayed to +userspace are throttled at a rate of CONFIG_HZ jiffies. + +References +---------- + +.. [1] https://www.intel.com/sdm -- Gitee From 07dc6e0b04d8eca2963e138452d5b24af8f82b28 Mon Sep 17 00:00:00 2001 From: Ricardo Neri Date: Thu, 27 Jan 2022 11:34:52 -0800 Subject: [PATCH 07/11] thermal: intel: hfi: Enable notification interrupt mainline inclusion from mainline-5.18 commit ab09b0744a9944cbdc0ac9a5cb00bef72adf79d5 category: feature bugzilla: https://gitee.com/openeuler/intel-kernel/issues/I5DSOL Intel_SIG: commit ab09b0744a99 thermal: intel: hfi: Enable notification interrupt. Backport for Intel HFI (Hardware Feedback Interface) support ------------------------------------- When hardware wants to inform the operating system about updates in the HFI table, it issues a package-level thermal event interrupt. For this, hardware has new interrupt and status bits in the IA32_PACKAGE_THERM_ INTERRUPT and IA32_PACKAGE_THERM_STATUS registers. The existing thermal throttle driver already handles thermal event interrupts: it initializes the thermal vector of the local APIC as well as per-CPU and package-level interrupt reporting. It also provides routines to service such interrupts. Extend its functionality to also handle HFI interrupts. The frequency of the thermal HFI interrupt is specific to each processor model. On some processors, a single interrupt happens as soon as the HFI is enabled and hardware will never update HFI capabilities afterwards. On other processors, thermal and power constraints may cause thermal HFI interrupts every tens of milliseconds. To not overwhelm consumers of the HFI data, use delayed work to throttle the rate at which HFI updates are processed. Use a dedicated workqueue to not overload system_wq if hardware issues many HFI updates. Reviewed-by: Len Brown Signed-off-by: Ricardo Neri Signed-off-by: Rafael J. Wysocki Signed-off-by: yingbao jia Signed-off-by: Jun Tian --- drivers/thermal/intel/intel_hfi.c | 110 ++++++++++++++++++++++++++++ drivers/thermal/intel/intel_hfi.h | 2 + drivers/thermal/intel/therm_throt.c | 10 +++ 3 files changed, 122 insertions(+) diff --git a/drivers/thermal/intel/intel_hfi.c b/drivers/thermal/intel/intel_hfi.c index 8cac7ee6a20f..ebaf767bc83d 100644 --- a/drivers/thermal/intel/intel_hfi.c +++ b/drivers/thermal/intel/intel_hfi.c @@ -26,19 +26,27 @@ #include #include #include +#include #include #include #include #include #include +#include +#include #include +#include #include #include "intel_hfi.h" +#define THERM_STATUS_CLEAR_PKG_MASK (BIT(1) | BIT(3) | BIT(5) | BIT(7) | \ + BIT(9) | BIT(11) | BIT(26)) + /* Hardware Feedback Interface MSR configuration bits */ #define HW_FEEDBACK_PTR_VALID_BIT BIT(0) +#define HW_FEEDBACK_CONFIG_HFI_ENABLE_BIT BIT(0) /* CPUID detection and enumeration definitions for HFI */ @@ -97,6 +105,9 @@ struct hfi_hdr { * @data: Base address of the data of the local table * @cpus: CPUs represented in this HFI table instance * @hw_table: Pointer to the HFI table of this instance + * @update_work: Delayed work to process HFI updates + * @table_lock: Lock to protect acceses to the table of this instance + * @event_lock: Lock to process HFI interrupts * * A set of parameters to parse and navigate a specific HFI table. */ @@ -109,6 +120,9 @@ struct hfi_instance { void *data; cpumask_var_t cpus; void *hw_table; + struct delayed_work update_work; + raw_spinlock_t table_lock; + raw_spinlock_t event_lock; }; /** @@ -146,6 +160,86 @@ static struct hfi_instance *hfi_instances; static struct hfi_features hfi_features; static DEFINE_MUTEX(hfi_instance_lock); +static struct workqueue_struct *hfi_updates_wq; +#define HFI_UPDATE_INTERVAL HZ + +static void hfi_update_work_fn(struct work_struct *work) +{ + struct hfi_instance *hfi_instance; + + hfi_instance = container_of(to_delayed_work(work), struct hfi_instance, + update_work); + if (!hfi_instance) + return; + + /* TODO: Consume update here. */ +} + +void intel_hfi_process_event(__u64 pkg_therm_status_msr_val) +{ + struct hfi_instance *hfi_instance; + int cpu = smp_processor_id(); + struct hfi_cpu_info *info; + u64 new_timestamp; + + if (!pkg_therm_status_msr_val) + return; + + info = &per_cpu(hfi_cpu_info, cpu); + if (!info) + return; + + /* + * A CPU is linked to its HFI instance before the thermal vector in the + * local APIC is unmasked. Hence, info->hfi_instance cannot be NULL + * when receiving an HFI event. + */ + hfi_instance = info->hfi_instance; + if (unlikely(!hfi_instance)) { + pr_debug("Received event on CPU %d but instance was null", cpu); + return; + } + + /* + * On most systems, all CPUs in the package receive a package-level + * thermal interrupt when there is an HFI update. It is sufficient to + * let a single CPU to acknowledge the update and queue work to + * process it. The remaining CPUs can resume their work. + */ + if (!raw_spin_trylock(&hfi_instance->event_lock)) + return; + + /* Skip duplicated updates. */ + new_timestamp = *(u64 *)hfi_instance->hw_table; + if (*hfi_instance->timestamp == new_timestamp) { + raw_spin_unlock(&hfi_instance->event_lock); + return; + } + + raw_spin_lock(&hfi_instance->table_lock); + + /* + * Copy the updated table into our local copy. This includes the new + * timestamp. + */ + memcpy(hfi_instance->local_table, hfi_instance->hw_table, + hfi_features.nr_table_pages << PAGE_SHIFT); + + raw_spin_unlock(&hfi_instance->table_lock); + raw_spin_unlock(&hfi_instance->event_lock); + + /* + * Let hardware know that we are done reading the HFI table and it is + * free to update it again. + */ + pkg_therm_status_msr_val &= THERM_STATUS_CLEAR_PKG_MASK & + ~PACKAGE_THERM_STATUS_HFI_UPDATED; + wrmsrl(MSR_IA32_PACKAGE_THERM_STATUS, pkg_therm_status_msr_val); + + queue_delayed_work(hfi_updates_wq, &hfi_instance->update_work, + HFI_UPDATE_INTERVAL); +} + static void init_hfi_cpu_index(struct hfi_cpu_info *info) { union cpuid6_edx edx; @@ -257,8 +351,20 @@ void intel_hfi_online(unsigned int cpu) init_hfi_instance(hfi_instance); + INIT_DELAYED_WORK(&hfi_instance->update_work, hfi_update_work_fn); + raw_spin_lock_init(&hfi_instance->table_lock); + raw_spin_lock_init(&hfi_instance->event_lock); + cpumask_set_cpu(cpu, hfi_instance->cpus); + /* + * Enable the hardware feedback interface and never disable it. See + * comment on programming the address of the table. + */ + rdmsrl(MSR_IA32_HW_FEEDBACK_CONFIG, msr_val); + msr_val |= HW_FEEDBACK_CONFIG_HFI_ENABLE_BIT; + wrmsrl(MSR_IA32_HW_FEEDBACK_CONFIG, msr_val); + unlock: mutex_unlock(&hfi_instance_lock); return; @@ -372,6 +478,10 @@ void __init intel_hfi_init(void) goto err_nomem; } + hfi_updates_wq = create_singlethread_workqueue("hfi-updates"); + if (!hfi_updates_wq) + goto err_nomem; + return; err_nomem: diff --git a/drivers/thermal/intel/intel_hfi.h b/drivers/thermal/intel/intel_hfi.h index 56c6b2d75202..325aa78b745c 100644 --- a/drivers/thermal/intel/intel_hfi.h +++ b/drivers/thermal/intel/intel_hfi.h @@ -6,10 +6,12 @@ void __init intel_hfi_init(void); void intel_hfi_online(unsigned int cpu); void intel_hfi_offline(unsigned int cpu); +void intel_hfi_process_event(__u64 pkg_therm_status_msr_val); #else static inline void intel_hfi_init(void) { } static inline void intel_hfi_online(unsigned int cpu) { } static inline void intel_hfi_offline(unsigned int cpu) { } +static inline void intel_hfi_process_event(__u64 pkg_therm_status_msr_val) { } #endif /* CONFIG_INTEL_HFI_THERMAL */ #endif /* _INTEL_HFI_H */ diff --git a/drivers/thermal/intel/therm_throt.c b/drivers/thermal/intel/therm_throt.c index e4f95cf06b82..8cc35a9f3862 100644 --- a/drivers/thermal/intel/therm_throt.c +++ b/drivers/thermal/intel/therm_throt.c @@ -615,6 +615,10 @@ void intel_thermal_interrupt(void) PACKAGE_THERM_STATUS_POWER_LIMIT, POWER_LIMIT_EVENT, PACKAGE_LEVEL); + + if (this_cpu_has(X86_FEATURE_HFI)) + intel_hfi_process_event(msr_val & + PACKAGE_THERM_STATUS_HFI_UPDATED); } } @@ -717,6 +721,12 @@ void intel_init_thermal(struct cpuinfo_x86 *c) wrmsr(MSR_IA32_PACKAGE_THERM_INTERRUPT, l | (PACKAGE_THERM_INT_LOW_ENABLE | PACKAGE_THERM_INT_HIGH_ENABLE), h); + + if (cpu_has(c, X86_FEATURE_HFI)) { + rdmsr(MSR_IA32_PACKAGE_THERM_INTERRUPT, l, h); + wrmsr(MSR_IA32_PACKAGE_THERM_INTERRUPT, + l | PACKAGE_THERM_INT_HFI_ENABLE, h); + } } rdmsr(MSR_IA32_MISC_ENABLE, l, h); -- Gitee From b0b8a4822c7764d153f1fc03ba3b7d37c0cba077 Mon Sep 17 00:00:00 2001 From: Srinivas Pandruvada Date: Thu, 27 Jan 2022 11:34:54 -0800 Subject: [PATCH 08/11] thermal: intel: hfi: Notify user space for HFI events mainline inclusion from mainline-5.18 commit bd30cdfd9bd73b68e4977ce7c5540aa7b14c25cd category: feature bugzilla: https://gitee.com/openeuler/intel-kernel/issues/I5DSOL Intel_SIG: commit bd30cdfd9bd7 thermal: intel: hfi: Notify user space for HFI events. Backport for Intel HFI (Hardware Feedback Interface) support ------------------------------------- When the hardware issues an HFI event, relay a notification to user space. This allows user space to respond by reading performance and efficiency of each CPU and take appropriate action. For example, when the performance and efficiency of a CPU is 0, user space can either offline the CPU or inject idle. Also, if user space notices a downward trend in performance, it may proactively adjust power limits to avoid future situations in which performance drops to 0. To avoid excessive notifications, the rate is limited by one HZ per event. To limit the netlink message size, send parameters for up to 16 CPUs in a single message. If there are more than 16 CPUs, issue as many messages as needed to notify the status of all CPUs. In the HFI specification, both performance and efficiency capabilities are defined in the [0, 255] range. The existing implementations of HFI hardware do not scale the maximum values to 255. Since userspace cares about capability values that are either 0 or show a downward/upward trend, this fact does not matter much. Relative changes in capabilities are enough. To comply with the thermal netlink ABI, scale both performance and efficiency capabilities to the [0, 1023] interval. Reviewed-by: Len Brown Signed-off-by: Srinivas Pandruvada Signed-off-by: Rafael J. Wysocki Signed-off-by: yingbao jia Signed-off-by: Jun Tian --- drivers/thermal/intel/Kconfig | 1 + drivers/thermal/intel/intel_hfi.c | 75 ++++++++++++++++++++++++++++++- 2 files changed, 75 insertions(+), 1 deletion(-) diff --git a/drivers/thermal/intel/Kconfig b/drivers/thermal/intel/Kconfig index 26aea864aaca..510d36326dfd 100644 --- a/drivers/thermal/intel/Kconfig +++ b/drivers/thermal/intel/Kconfig @@ -84,6 +84,7 @@ config INTEL_HFI_THERMAL bool "Intel Hardware Feedback Interface" depends on CPU_SUP_INTEL depends on X86_THERMAL_VECTOR + select THERMAL_NETLINK help Select this option to enable the Hardware Feedback Interface. If selected, hardware provides guidance to the operating system on diff --git a/drivers/thermal/intel/intel_hfi.c b/drivers/thermal/intel/intel_hfi.c index ebaf767bc83d..158a2b7c6b6f 100644 --- a/drivers/thermal/intel/intel_hfi.c +++ b/drivers/thermal/intel/intel_hfi.c @@ -39,6 +39,7 @@ #include +#include "../thermal_core.h" #include "intel_hfi.h" #define THERM_STATUS_CLEAR_PKG_MASK (BIT(1) | BIT(3) | BIT(5) | BIT(7) | \ @@ -162,6 +163,78 @@ static DEFINE_MUTEX(hfi_instance_lock); static struct workqueue_struct *hfi_updates_wq; #define HFI_UPDATE_INTERVAL HZ +#define HFI_MAX_THERM_NOTIFY_COUNT 16 + +static void get_hfi_caps(struct hfi_instance *hfi_instance, + struct thermal_genl_cpu_caps *cpu_caps) +{ + int cpu, i = 0; + + raw_spin_lock_irq(&hfi_instance->table_lock); + for_each_cpu(cpu, hfi_instance->cpus) { + struct hfi_cpu_data *caps; + s16 index; + + index = per_cpu(hfi_cpu_info, cpu).index; + caps = hfi_instance->data + index * hfi_features.cpu_stride; + cpu_caps[i].cpu = cpu; + + /* + * Scale performance and energy efficiency to + * the [0, 1023] interval that thermal netlink uses. + */ + cpu_caps[i].performance = caps->perf_cap << 2; + cpu_caps[i].efficiency = caps->ee_cap << 2; + + ++i; + } + raw_spin_unlock_irq(&hfi_instance->table_lock); +} + +/* + * Call update_capabilities() when there are changes in the HFI table. + */ +static void update_capabilities(struct hfi_instance *hfi_instance) +{ + struct thermal_genl_cpu_caps *cpu_caps; + int i = 0, cpu_count; + + /* CPUs may come online/offline while processing an HFI update. */ + mutex_lock(&hfi_instance_lock); + + cpu_count = cpumask_weight(hfi_instance->cpus); + + /* No CPUs to report in this hfi_instance. */ + if (!cpu_count) + goto out; + + cpu_caps = kcalloc(cpu_count, sizeof(*cpu_caps), GFP_KERNEL); + if (!cpu_caps) + goto out; + + get_hfi_caps(hfi_instance, cpu_caps); + + if (cpu_count < HFI_MAX_THERM_NOTIFY_COUNT) + goto last_cmd; + + /* Process complete chunks of HFI_MAX_THERM_NOTIFY_COUNT capabilities. */ + for (i = 0; + (i + HFI_MAX_THERM_NOTIFY_COUNT) <= cpu_count; + i += HFI_MAX_THERM_NOTIFY_COUNT) + thermal_genl_cpu_capability_event(HFI_MAX_THERM_NOTIFY_COUNT, + &cpu_caps[i]); + + cpu_count = cpu_count - i; + +last_cmd: + /* Process the remaining capabilities if any. */ + if (cpu_count) + thermal_genl_cpu_capability_event(cpu_count, &cpu_caps[i]); + + kfree(cpu_caps); +out: + mutex_unlock(&hfi_instance_lock); +} static void hfi_update_work_fn(struct work_struct *work) { @@ -172,7 +245,7 @@ static void hfi_update_work_fn(struct work_struct *work) if (!hfi_instance) return; - /* TODO: Consume update here. */ + update_capabilities(hfi_instance); } void intel_hfi_process_event(__u64 pkg_therm_status_msr_val) -- Gitee From 9c1fe5896c82aa7193bdfe10b45845bcb11210bb Mon Sep 17 00:00:00 2001 From: Randy Dunlap Date: Tue, 8 Feb 2022 16:15:46 -0800 Subject: [PATCH 09/11] thermal: intel: hfi: INTEL_HFI_THERMAL depends on NET mainline inclusion from mainline-5.18 commit c95aa2bab974394809edea28690f6504a15791b6 category: feature bugzilla: https://gitee.com/openeuler/intel-kernel/issues/I5DSOL Intel_SIG: commit c95aa2bab974 thermal: intel: hfi: INTEL_HFI_THERMAL depends on NET. Backport for Intel HFI (Hardware Feedback Interface) support ------------------------------------- THERMAL_NETLINK depends on NET and since 'select' does not follow any dependency chain, INTEL_HFI_THERMAL also should depend on NET. Fix one Kconfig warning and 48 subsequent build errors: WARNING: unmet direct dependencies detected for THERMAL_NETLINK Depends on [n]: THERMAL [=y] && NET [=n] Selected by [y]: - INTEL_HFI_THERMAL [=y] && THERMAL [=y] && (X86 [=y] || X86_INTEL_QUARK [=n] || COMPILE_TEST [=y]) && CPU_SUP_INTEL [=y] && X86_THERMAL_VECTOR [=y] Fixes: bd30cdfd9bd7 ("thermal: intel: hfi: Notify user space for HFI events") Signed-off-by: Randy Dunlap Reviewed-by: Srinivas Pandruvada Signed-off-by: Rafael J. Wysocki Signed-off-by: yingbao jia Signed-off-by: Jun Tian --- drivers/thermal/intel/Kconfig | 1 + 1 file changed, 1 insertion(+) diff --git a/drivers/thermal/intel/Kconfig b/drivers/thermal/intel/Kconfig index 510d36326dfd..876869d57313 100644 --- a/drivers/thermal/intel/Kconfig +++ b/drivers/thermal/intel/Kconfig @@ -82,6 +82,7 @@ config INTEL_PCH_THERMAL config INTEL_HFI_THERMAL bool "Intel Hardware Feedback Interface" + depends on NET depends on CPU_SUP_INTEL depends on X86_THERMAL_VECTOR select THERMAL_NETLINK -- Gitee From d1b287f6c142193c6dc5a5abfe2fe59e2f03cee6 Mon Sep 17 00:00:00 2001 From: Srinivas Pandruvada Date: Thu, 27 Jan 2022 11:34:53 -0800 Subject: [PATCH 10/11] thermal: netlink: Add a new event to notify CPU capabilities change mainline inclusion from mainline-5.18 commit e4b1eb24ce5a696ef7229f9926ff34d7502f0582 category: feature bugzilla: https://gitee.com/openeuler/intel-kernel/issues/I5DSOL Intel_SIG: commit e4b1eb24ce5a thermal: netlink: Add a new event to notify CPU capabilities change. Backport for Intel HFI (Hardware Feedback Interface) support ------------------------------------- Add a new netlink event to notify change in CPU capabilities in terms of performance and efficiency. Firmware may change CPU capabilities as a result of thermal events in the system or to account for changes in the TDP (thermal design power) level. This notification type will allow user space to avoid running workloads on certain CPUs or proactively adjust power limits to avoid future events. The netlink message consists of a nested attribute (THERMAL_GENL_ATTR_CPU_CAPABILITY) with three attributes: * THERMAL_GENL_ATTR_CPU_CAPABILITY_ID (type u32): -- logical CPU number * THERMAL_GENL_ATTR_CPU_CAPABILITY_PERFORMANCE (type u32): -- Scaled performance from 0-1023 * THERMAL_GENL_ATTR_CPU_CAPABILITY_EFFICIENCY (type u32): -- Scaled efficiency from 0-1023 Reviewed-by: Len Brown Signed-off-by: Srinivas Pandruvada Signed-off-by: Rafael J. Wysocki Signed-off-by: yingbao jia Signed-off-by: Jun Tian --- drivers/thermal/thermal_netlink.c | 53 +++++++++++++++++++++++++++++++ drivers/thermal/thermal_netlink.h | 14 ++++++++ include/uapi/linux/thermal.h | 6 +++- 3 files changed, 72 insertions(+), 1 deletion(-) diff --git a/drivers/thermal/thermal_netlink.c b/drivers/thermal/thermal_netlink.c index 41c8d47805c4..dc535831b660 100644 --- a/drivers/thermal/thermal_netlink.c +++ b/drivers/thermal/thermal_netlink.c @@ -43,6 +43,11 @@ static const struct nla_policy thermal_genl_policy[THERMAL_GENL_ATTR_MAX + 1] = [THERMAL_GENL_ATTR_CDEV_MAX_STATE] = { .type = NLA_U32 }, [THERMAL_GENL_ATTR_CDEV_NAME] = { .type = NLA_STRING, .len = THERMAL_NAME_LENGTH }, + /* CPU capabilities */ + [THERMAL_GENL_ATTR_CPU_CAPABILITY] = { .type = NLA_NESTED }, + [THERMAL_GENL_ATTR_CPU_CAPABILITY_ID] = { .type = NLA_U32 }, + [THERMAL_GENL_ATTR_CPU_CAPABILITY_PERFORMANCE] = { .type = NLA_U32 }, + [THERMAL_GENL_ATTR_CPU_CAPABILITY_EFFICIENCY] = { .type = NLA_U32 }, }; struct param { @@ -58,6 +63,8 @@ struct param { int temp; int cdev_state; int cdev_max_state; + struct thermal_genl_cpu_caps *cpu_capabilities; + int cpu_capabilities_count; }; typedef int (*cb_t)(struct param *); @@ -189,6 +196,42 @@ static int thermal_genl_event_gov_change(struct param *p) return 0; } +static int thermal_genl_event_cpu_capability_change(struct param *p) +{ + struct thermal_genl_cpu_caps *cpu_cap = p->cpu_capabilities; + struct sk_buff *msg = p->msg; + struct nlattr *start_cap; + int i; + + start_cap = nla_nest_start(msg, THERMAL_GENL_ATTR_CPU_CAPABILITY); + if (!start_cap) + return -EMSGSIZE; + + for (i = 0; i < p->cpu_capabilities_count; ++i) { + if (nla_put_u32(msg, THERMAL_GENL_ATTR_CPU_CAPABILITY_ID, + cpu_cap->cpu)) + goto out_cancel_nest; + + if (nla_put_u32(msg, THERMAL_GENL_ATTR_CPU_CAPABILITY_PERFORMANCE, + cpu_cap->performance)) + goto out_cancel_nest; + + if (nla_put_u32(msg, THERMAL_GENL_ATTR_CPU_CAPABILITY_EFFICIENCY, + cpu_cap->efficiency)) + goto out_cancel_nest; + + ++cpu_cap; + } + + nla_nest_end(msg, start_cap); + + return 0; +out_cancel_nest: + nla_nest_cancel(msg, start_cap); + + return -EMSGSIZE; +} + int thermal_genl_event_tz_delete(struct param *p) __attribute__((alias("thermal_genl_event_tz"))); @@ -218,6 +261,7 @@ static cb_t event_cb[] = { [THERMAL_GENL_EVENT_CDEV_DELETE] = thermal_genl_event_cdev_delete, [THERMAL_GENL_EVENT_CDEV_STATE_UPDATE] = thermal_genl_event_cdev_state_update, [THERMAL_GENL_EVENT_TZ_GOV_CHANGE] = thermal_genl_event_gov_change, + [THERMAL_GENL_EVENT_CPU_CAPABILITY_CHANGE] = thermal_genl_event_cpu_capability_change, }; /* @@ -355,6 +399,15 @@ int thermal_notify_tz_gov_change(int tz_id, const char *name) return thermal_genl_send_event(THERMAL_GENL_EVENT_TZ_GOV_CHANGE, &p); } +int thermal_genl_cpu_capability_event(int count, + struct thermal_genl_cpu_caps *caps) +{ + struct param p = { .cpu_capabilities_count = count, .cpu_capabilities = caps }; + + return thermal_genl_send_event(THERMAL_GENL_EVENT_CPU_CAPABILITY_CHANGE, &p); +} +EXPORT_SYMBOL_GPL(thermal_genl_cpu_capability_event); + /*************************** Command encoding ********************************/ static int __thermal_genl_cmd_tz_get_id(struct thermal_zone_device *tz, diff --git a/drivers/thermal/thermal_netlink.h b/drivers/thermal/thermal_netlink.h index 828d1dddfa98..7439b245e41e 100644 --- a/drivers/thermal/thermal_netlink.h +++ b/drivers/thermal/thermal_netlink.h @@ -4,6 +4,12 @@ * Author: Daniel Lezcano */ +struct thermal_genl_cpu_caps { + int cpu; + int performance; + int efficiency; +}; + /* Netlink notification function */ #ifdef CONFIG_THERMAL_NETLINK int __init thermal_netlink_init(void); @@ -23,6 +29,8 @@ int thermal_notify_cdev_add(int cdev_id, const char *name, int max_state); int thermal_notify_cdev_delete(int cdev_id); int thermal_notify_tz_gov_change(int tz_id, const char *name); int thermal_genl_sampling_temp(int id, int temp); +int thermal_genl_cpu_capability_event(int count, + struct thermal_genl_cpu_caps *caps); #else static inline int thermal_netlink_init(void) { @@ -101,4 +109,10 @@ static inline int thermal_genl_sampling_temp(int id, int temp) { return 0; } + +static inline int thermal_genl_cpu_capability_event(int count, struct cpu_capability *caps) +{ + return 0; +} + #endif /* CONFIG_THERMAL_NETLINK */ diff --git a/include/uapi/linux/thermal.h b/include/uapi/linux/thermal.h index c105054cbb57..06a8cea36fe3 100644 --- a/include/uapi/linux/thermal.h +++ b/include/uapi/linux/thermal.h @@ -44,7 +44,10 @@ enum thermal_genl_attr { THERMAL_GENL_ATTR_CDEV_MAX_STATE, THERMAL_GENL_ATTR_CDEV_NAME, THERMAL_GENL_ATTR_GOV_NAME, - + THERMAL_GENL_ATTR_CPU_CAPABILITY, + THERMAL_GENL_ATTR_CPU_CAPABILITY_ID, + THERMAL_GENL_ATTR_CPU_CAPABILITY_PERFORMANCE, + THERMAL_GENL_ATTR_CPU_CAPABILITY_EFFICIENCY, __THERMAL_GENL_ATTR_MAX, }; #define THERMAL_GENL_ATTR_MAX (__THERMAL_GENL_ATTR_MAX - 1) @@ -71,6 +74,7 @@ enum thermal_genl_event { THERMAL_GENL_EVENT_CDEV_DELETE, /* Cdev unbound */ THERMAL_GENL_EVENT_CDEV_STATE_UPDATE, /* Cdev state updated */ THERMAL_GENL_EVENT_TZ_GOV_CHANGE, /* Governor policy changed */ + THERMAL_GENL_EVENT_CPU_CAPABILITY_CHANGE, /* CPU capability changed */ __THERMAL_GENL_EVENT_MAX, }; #define THERMAL_GENL_EVENT_MAX (__THERMAL_GENL_EVENT_MAX - 1) -- Gitee From ddbef6c0c3a2bd531aa7bfe545d6eb0ad6b23f76 Mon Sep 17 00:00:00 2001 From: Nathan Chancellor Date: Mon, 7 Feb 2022 09:38:29 -0700 Subject: [PATCH 11/11] thermal: netlink: Fix parameter type of thermal_genl_cpu_capability_event() stub mainline inclusion mainline-5.18 commit 345be4275cad454ae7e25884369a9c6c25e56279 category: feature bugzilla: https://gitee.com/openeuler/intel-kernel/issues/I5DSOL Intel_SIG: commit 345be4275cad thermal: netlink: Fix parameter type of thermal_genl_cpu_capability_event() stub. Backport for Intel HFI (Hardware Feedback Interface) support ------------------------------------- When building with CONFIG_THERMAL_NETLINK=n, there is a spew of warnings along the lines of: In file included from drivers/thermal/thermal_core.c:27: In file included from drivers/thermal/thermal_core.h:15: drivers/thermal/thermal_netlink.h:113:71: warning: declaration of 'struct cpu_capability' will not be visible outside of this function [-Wvisibility] static inline int thermal_genl_cpu_capability_event(int count, struct cpu_capability *caps) ^ 1 warning generated. 'struct cpu_capability' is not forward declared anywhere in the header. As it turns out, this should really be 'struct thermal_genl_cpu_caps', which silences the warning and makes the parameter types of the stub match the full function. Fixes: e4b1eb24ce5a ("thermal: netlink: Add a new event to notify CPU capabilities change") Reported-by: Stephen Rothwell Signed-off-by: Nathan Chancellor Reviewed-by: Srinivas Pandruvada Signed-off-by: Rafael J. Wysocki Signed-off-by: yingbao jia Signed-off-by: Jun Tian --- drivers/thermal/thermal_netlink.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/thermal/thermal_netlink.h b/drivers/thermal/thermal_netlink.h index 7439b245e41e..fd4188470d3f 100644 --- a/drivers/thermal/thermal_netlink.h +++ b/drivers/thermal/thermal_netlink.h @@ -110,7 +110,7 @@ static inline int thermal_genl_sampling_temp(int id, int temp) return 0; } -static inline int thermal_genl_cpu_capability_event(int count, struct cpu_capability *caps) +static inline int thermal_genl_cpu_capability_event(int count, struct thermal_genl_cpu_caps *caps) { return 0; } -- Gitee