// SPDX-License-Identifier: GPL-2.0-only /* * uncore-frquency-tpmi: Uncore frequency scaling using TPMI * * Copyright (c) 2023, Intel Corporation. * All Rights Reserved. * * The hardware interface to read/write is basically substitution of * MSR 0x620 and 0x621. * There are specific MMIO offset and bits to get/set minimum and * maximum uncore ratio, similar to MSRs. * The scope of the uncore MSRs was package scope. But TPMI allows * new gen CPUs to have multiple uncore controls at uncore-cluster * level. Each package can have multiple power domains which further * can have multiple clusters. * Here number of power domains = number of resources in this aux * device. There are offsets and bits to discover number of clusters * and offset for each cluster level controls. * */ #include <linux/auxiliary_bus.h> #include <linux/bitfield.h> #include <linux/bits.h> #include <linux/io.h> #include <linux/module.h> #include <linux/intel_tpmi.h> #include "uncore-frequency-common.h" #define UNCORE_MAJOR_VERSION … #define UNCORE_MINOR_VERSION … #define UNCORE_HEADER_INDEX … #define UNCORE_FABRIC_CLUSTER_OFFSET … /* status + control + adv_ctl1 + adv_ctl2 */ #define UNCORE_FABRIC_CLUSTER_SIZE … #define UNCORE_STATUS_INDEX … #define UNCORE_CONTROL_INDEX … #define UNCORE_FREQ_KHZ_MULTIPLIER … struct tpmi_uncore_struct; /* Information for each cluster */ struct tpmi_uncore_cluster_info { … }; /* Information for each power domain */ struct tpmi_uncore_power_domain_info { … }; /* Information for all power domains in a package */ struct tpmi_uncore_struct { … }; /* Bit definitions for STATUS register */ #define UNCORE_CURRENT_RATIO_MASK … /* Bit definitions for CONTROL register */ #define UNCORE_MAX_RATIO_MASK … #define UNCORE_MIN_RATIO_MASK … /* Helper function to read MMIO offset for max/min control frequency */ static void read_control_freq(struct tpmi_uncore_cluster_info *cluster_info, unsigned int *value, enum uncore_index index) { … } #define UNCORE_MAX_RATIO … /* Helper for sysfs read for max/min frequencies. Called under mutex locks */ static int uncore_read_control_freq(struct uncore_data *data, unsigned int *value, enum uncore_index index) { … } /* Helper function to write MMIO offset for max/min control frequency */ static void write_control_freq(struct tpmi_uncore_cluster_info *cluster_info, unsigned int input, unsigned int index) { … } /* Callback for sysfs write for max/min frequencies. Called under mutex locks */ static int uncore_write_control_freq(struct uncore_data *data, unsigned int input, enum uncore_index index) { … } /* Helper for sysfs read for the current uncore frequency. Called under mutex locks */ static int uncore_read_freq(struct uncore_data *data, unsigned int *freq) { … } /* Callback for sysfs read for TPMI uncore values. Called under mutex locks. */ static int uncore_read(struct uncore_data *data, unsigned int *value, enum uncore_index index) { … } static void remove_cluster_entries(struct tpmi_uncore_struct *tpmi_uncore) { … } #define UNCORE_VERSION_MASK … #define UNCORE_LOCAL_FABRIC_CLUSTER_ID_MASK … #define UNCORE_CLUSTER_OFF_MASK … #define UNCORE_MAX_CLUSTER_PER_DOMAIN … static int uncore_probe(struct auxiliary_device *auxdev, const struct auxiliary_device_id *id) { … } static void uncore_remove(struct auxiliary_device *auxdev) { … } static const struct auxiliary_device_id intel_uncore_id_table[] = …; MODULE_DEVICE_TABLE(auxiliary, intel_uncore_id_table); static struct auxiliary_driver intel_uncore_aux_driver = …; module_auxiliary_driver(…) …; MODULE_IMPORT_NS(…); MODULE_IMPORT_NS(…); MODULE_DESCRIPTION(…) …; MODULE_LICENSE(…) …;
Codebase Browser
linux