diff options
Diffstat (limited to 'drivers/platform/x86/intel/uncore-frequency')
5 files changed, 628 insertions, 0 deletions
diff --git a/drivers/platform/x86/intel/uncore-frequency/Kconfig b/drivers/platform/x86/intel/uncore-frequency/Kconfig new file mode 100644 index 000000000..21b209124 --- /dev/null +++ b/drivers/platform/x86/intel/uncore-frequency/Kconfig @@ -0,0 +1,21 @@ +# SPDX-License-Identifier: GPL-2.0-only +# +# Uncore Frquency control drivers +# + +menu "Intel Uncore Frequency Control" + depends on X86_64 || COMPILE_TEST + +config INTEL_UNCORE_FREQ_CONTROL + tristate "Intel Uncore frequency control driver" + depends on X86_64 + help + This driver allows control of Uncore frequency limits on + supported server platforms. + + Uncore frequency controls RING/LLC (last-level cache) clocks. + + To compile this driver as a module, choose M here: the module + will be called intel-uncore-frequency. + +endmenu diff --git a/drivers/platform/x86/intel/uncore-frequency/Makefile b/drivers/platform/x86/intel/uncore-frequency/Makefile new file mode 100644 index 000000000..e0f7968e8 --- /dev/null +++ b/drivers/platform/x86/intel/uncore-frequency/Makefile @@ -0,0 +1,9 @@ +# SPDX-License-Identifier: GPL-2.0 +# +# Makefile for linux/drivers/platform/x86/intel/uncore-frequency +# + +obj-$(CONFIG_INTEL_UNCORE_FREQ_CONTROL) += intel-uncore-frequency.o +intel-uncore-frequency-y := uncore-frequency.o +obj-$(CONFIG_INTEL_UNCORE_FREQ_CONTROL) += intel-uncore-frequency-common.o +intel-uncore-frequency-common-y := uncore-frequency-common.o diff --git a/drivers/platform/x86/intel/uncore-frequency/uncore-frequency-common.c b/drivers/platform/x86/intel/uncore-frequency/uncore-frequency-common.c new file mode 100644 index 000000000..dd2e654da --- /dev/null +++ b/drivers/platform/x86/intel/uncore-frequency/uncore-frequency-common.c @@ -0,0 +1,260 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Intel Uncore Frequency Control: Common code implementation + * Copyright (c) 2022, Intel Corporation. + * All rights reserved. + * + */ +#include <linux/cpu.h> +#include <linux/module.h> +#include "uncore-frequency-common.h" + +/* Mutex to control all mutual exclusions */ +static DEFINE_MUTEX(uncore_lock); +/* Root of the all uncore sysfs kobjs */ +static struct kobject *uncore_root_kobj; +/* uncore instance count */ +static int uncore_instance_count; + +/* callbacks for actual HW read/write */ +static int (*uncore_read)(struct uncore_data *data, unsigned int *min, unsigned int *max); +static int (*uncore_write)(struct uncore_data *data, unsigned int input, unsigned int min_max); +static int (*uncore_read_freq)(struct uncore_data *data, unsigned int *freq); + +static ssize_t show_min_max_freq_khz(struct uncore_data *data, + char *buf, int min_max) +{ + unsigned int min, max; + int ret; + + mutex_lock(&uncore_lock); + ret = uncore_read(data, &min, &max); + mutex_unlock(&uncore_lock); + if (ret) + return ret; + + if (min_max) + return sprintf(buf, "%u\n", max); + + return sprintf(buf, "%u\n", min); +} + +static ssize_t store_min_max_freq_khz(struct uncore_data *data, + const char *buf, ssize_t count, + int min_max) +{ + unsigned int input; + int ret; + + if (kstrtouint(buf, 10, &input)) + return -EINVAL; + + mutex_lock(&uncore_lock); + ret = uncore_write(data, input, min_max); + mutex_unlock(&uncore_lock); + + if (ret) + return ret; + + return count; +} + +static ssize_t show_perf_status_freq_khz(struct uncore_data *data, char *buf) +{ + unsigned int freq; + int ret; + + mutex_lock(&uncore_lock); + ret = uncore_read_freq(data, &freq); + mutex_unlock(&uncore_lock); + if (ret) + return ret; + + return sprintf(buf, "%u\n", freq); +} + +#define store_uncore_min_max(name, min_max) \ + static ssize_t store_##name(struct kobject *kobj, \ + struct kobj_attribute *attr, \ + const char *buf, size_t count) \ + { \ + struct uncore_data *data = container_of(attr, struct uncore_data, name##_kobj_attr);\ + \ + return store_min_max_freq_khz(data, buf, count, \ + min_max); \ + } + +#define show_uncore_min_max(name, min_max) \ + static ssize_t show_##name(struct kobject *kobj, \ + struct kobj_attribute *attr, char *buf)\ + { \ + struct uncore_data *data = container_of(attr, struct uncore_data, name##_kobj_attr);\ + \ + return show_min_max_freq_khz(data, buf, min_max); \ + } + +#define show_uncore_perf_status(name) \ + static ssize_t show_##name(struct kobject *kobj, \ + struct kobj_attribute *attr, char *buf)\ + { \ + struct uncore_data *data = container_of(attr, struct uncore_data, name##_kobj_attr);\ + \ + return show_perf_status_freq_khz(data, buf); \ + } + +store_uncore_min_max(min_freq_khz, 0); +store_uncore_min_max(max_freq_khz, 1); + +show_uncore_min_max(min_freq_khz, 0); +show_uncore_min_max(max_freq_khz, 1); + +show_uncore_perf_status(current_freq_khz); + +#define show_uncore_data(member_name) \ + static ssize_t show_##member_name(struct kobject *kobj, \ + struct kobj_attribute *attr, char *buf)\ + { \ + struct uncore_data *data = container_of(attr, struct uncore_data,\ + member_name##_kobj_attr);\ + \ + return sysfs_emit(buf, "%u\n", \ + data->member_name); \ + } \ + +show_uncore_data(initial_min_freq_khz); +show_uncore_data(initial_max_freq_khz); + +#define init_attribute_rw(_name) \ + do { \ + sysfs_attr_init(&data->_name##_kobj_attr.attr); \ + data->_name##_kobj_attr.show = show_##_name; \ + data->_name##_kobj_attr.store = store_##_name; \ + data->_name##_kobj_attr.attr.name = #_name; \ + data->_name##_kobj_attr.attr.mode = 0644; \ + } while (0) + +#define init_attribute_ro(_name) \ + do { \ + sysfs_attr_init(&data->_name##_kobj_attr.attr); \ + data->_name##_kobj_attr.show = show_##_name; \ + data->_name##_kobj_attr.store = NULL; \ + data->_name##_kobj_attr.attr.name = #_name; \ + data->_name##_kobj_attr.attr.mode = 0444; \ + } while (0) + +#define init_attribute_root_ro(_name) \ + do { \ + sysfs_attr_init(&data->_name##_kobj_attr.attr); \ + data->_name##_kobj_attr.show = show_##_name; \ + data->_name##_kobj_attr.store = NULL; \ + data->_name##_kobj_attr.attr.name = #_name; \ + data->_name##_kobj_attr.attr.mode = 0400; \ + } while (0) + +static int create_attr_group(struct uncore_data *data, char *name) +{ + int ret, freq, index = 0; + + init_attribute_rw(max_freq_khz); + init_attribute_rw(min_freq_khz); + init_attribute_ro(initial_min_freq_khz); + init_attribute_ro(initial_max_freq_khz); + init_attribute_root_ro(current_freq_khz); + + data->uncore_attrs[index++] = &data->max_freq_khz_kobj_attr.attr; + data->uncore_attrs[index++] = &data->min_freq_khz_kobj_attr.attr; + data->uncore_attrs[index++] = &data->initial_min_freq_khz_kobj_attr.attr; + data->uncore_attrs[index++] = &data->initial_max_freq_khz_kobj_attr.attr; + + ret = uncore_read_freq(data, &freq); + if (!ret) + data->uncore_attrs[index++] = &data->current_freq_khz_kobj_attr.attr; + + data->uncore_attrs[index] = NULL; + + data->uncore_attr_group.name = name; + data->uncore_attr_group.attrs = data->uncore_attrs; + ret = sysfs_create_group(uncore_root_kobj, &data->uncore_attr_group); + + return ret; +} + +static void delete_attr_group(struct uncore_data *data, char *name) +{ + sysfs_remove_group(uncore_root_kobj, &data->uncore_attr_group); +} + +int uncore_freq_add_entry(struct uncore_data *data, int cpu) +{ + int ret = 0; + + mutex_lock(&uncore_lock); + if (data->valid) { + /* control cpu changed */ + data->control_cpu = cpu; + goto uncore_unlock; + } + + sprintf(data->name, "package_%02d_die_%02d", data->package_id, data->die_id); + + uncore_read(data, &data->initial_min_freq_khz, &data->initial_max_freq_khz); + + ret = create_attr_group(data, data->name); + if (!ret) { + data->control_cpu = cpu; + data->valid = true; + } + +uncore_unlock: + mutex_unlock(&uncore_lock); + + return ret; +} +EXPORT_SYMBOL_NS_GPL(uncore_freq_add_entry, INTEL_UNCORE_FREQUENCY); + +void uncore_freq_remove_die_entry(struct uncore_data *data) +{ + mutex_lock(&uncore_lock); + delete_attr_group(data, data->name); + data->control_cpu = -1; + data->valid = false; + mutex_unlock(&uncore_lock); +} +EXPORT_SYMBOL_NS_GPL(uncore_freq_remove_die_entry, INTEL_UNCORE_FREQUENCY); + +int uncore_freq_common_init(int (*read_control_freq)(struct uncore_data *data, unsigned int *min, unsigned int *max), + int (*write_control_freq)(struct uncore_data *data, unsigned int input, unsigned int set_max), + int (*read_freq)(struct uncore_data *data, unsigned int *freq)) +{ + mutex_lock(&uncore_lock); + + uncore_read = read_control_freq; + uncore_write = write_control_freq; + uncore_read_freq = read_freq; + + if (!uncore_root_kobj) + uncore_root_kobj = kobject_create_and_add("intel_uncore_frequency", + &cpu_subsys.dev_root->kobj); + if (uncore_root_kobj) + ++uncore_instance_count; + mutex_unlock(&uncore_lock); + + return uncore_root_kobj ? 0 : -ENOMEM; +} +EXPORT_SYMBOL_NS_GPL(uncore_freq_common_init, INTEL_UNCORE_FREQUENCY); + +void uncore_freq_common_exit(void) +{ + mutex_lock(&uncore_lock); + --uncore_instance_count; + if (!uncore_instance_count) { + kobject_put(uncore_root_kobj); + uncore_root_kobj = NULL; + } + mutex_unlock(&uncore_lock); +} +EXPORT_SYMBOL_NS_GPL(uncore_freq_common_exit, INTEL_UNCORE_FREQUENCY); + + +MODULE_LICENSE("GPL v2"); +MODULE_DESCRIPTION("Intel Uncore Frequency Common Module"); diff --git a/drivers/platform/x86/intel/uncore-frequency/uncore-frequency-common.h b/drivers/platform/x86/intel/uncore-frequency/uncore-frequency-common.h new file mode 100644 index 000000000..2d9dc3151 --- /dev/null +++ b/drivers/platform/x86/intel/uncore-frequency/uncore-frequency-common.h @@ -0,0 +1,62 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* + * Intel Uncore Frequency Control: Common defines and prototypes + * Copyright (c) 2022, Intel Corporation. + * All rights reserved. + * + */ + +#ifndef __INTEL_UNCORE_FREQ_COMMON_H +#define __INTEL_UNCORE_FREQ_COMMON_H + +#include <linux/device.h> + +/** + * struct uncore_data - Encapsulate all uncore data + * @stored_uncore_data: Last user changed MSR 620 value, which will be restored + * on system resume. + * @initial_min_freq_khz: Sampled minimum uncore frequency at driver init + * @initial_max_freq_khz: Sampled maximum uncore frequency at driver init + * @control_cpu: Designated CPU for a die to read/write + * @valid: Mark the data valid/invalid + * @package_id: Package id for this instance + * @die_id: Die id for this instance + * @name: Sysfs entry name for this instance + * @uncore_attr_group: Attribute group storage + * @max_freq_khz_dev_attr: Storage for kobject attribute max_freq_khz + * @mix_freq_khz_dev_attr: Storage for kobject attribute min_freq_khz + * @initial_max_freq_khz_dev_attr: Storage for kobject attribute initial_max_freq_khz + * @initial_min_freq_khz_dev_attr: Storage for kobject attribute initial_min_freq_khz + * @current_freq_khz_dev_attr: Storage for kobject attribute current_freq_khz + * @uncore_attrs: Attribute storage for group creation + * + * This structure is used to encapsulate all data related to uncore sysfs + * settings for a die/package. + */ +struct uncore_data { + u64 stored_uncore_data; + u32 initial_min_freq_khz; + u32 initial_max_freq_khz; + int control_cpu; + bool valid; + int package_id; + int die_id; + char name[32]; + + struct attribute_group uncore_attr_group; + struct kobj_attribute max_freq_khz_kobj_attr; + struct kobj_attribute min_freq_khz_kobj_attr; + struct kobj_attribute initial_max_freq_khz_kobj_attr; + struct kobj_attribute initial_min_freq_khz_kobj_attr; + struct kobj_attribute current_freq_khz_kobj_attr; + struct attribute *uncore_attrs[6]; +}; + +int uncore_freq_common_init(int (*read_control_freq)(struct uncore_data *data, unsigned int *min, unsigned int *max), + int (*write_control_freq)(struct uncore_data *data, unsigned int input, unsigned int min_max), + int (*uncore_read_freq)(struct uncore_data *data, unsigned int *freq)); +void uncore_freq_common_exit(void); +int uncore_freq_add_entry(struct uncore_data *data, int cpu); +void uncore_freq_remove_die_entry(struct uncore_data *data); + +#endif diff --git a/drivers/platform/x86/intel/uncore-frequency/uncore-frequency.c b/drivers/platform/x86/intel/uncore-frequency/uncore-frequency.c new file mode 100644 index 000000000..00ac7e381 --- /dev/null +++ b/drivers/platform/x86/intel/uncore-frequency/uncore-frequency.c @@ -0,0 +1,276 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Intel Uncore Frequency Setting + * Copyright (c) 2022, Intel Corporation. + * All rights reserved. + * + * Provide interface to set MSR 620 at a granularity of per die. On CPU online, + * one control CPU is identified per die to read/write limit. This control CPU + * is changed, if the CPU state is changed to offline. When the last CPU is + * offline in a die then remove the sysfs object for that die. + * The majority of actual code is related to sysfs create and read/write + * attributes. + * + * Author: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com> + */ + +#include <linux/cpu.h> +#include <linux/module.h> +#include <linux/slab.h> +#include <linux/suspend.h> +#include <asm/cpu_device_id.h> +#include <asm/intel-family.h> + +#include "uncore-frequency-common.h" + +/* Max instances for uncore data, one for each die */ +static int uncore_max_entries __read_mostly; +/* Storage for uncore data for all instances */ +static struct uncore_data *uncore_instances; +/* Stores the CPU mask of the target CPUs to use during uncore read/write */ +static cpumask_t uncore_cpu_mask; +/* CPU online callback register instance */ +static enum cpuhp_state uncore_hp_state __read_mostly; + +#define MSR_UNCORE_RATIO_LIMIT 0x620 +#define MSR_UNCORE_PERF_STATUS 0x621 +#define UNCORE_FREQ_KHZ_MULTIPLIER 100000 + +static int uncore_read_control_freq(struct uncore_data *data, unsigned int *min, + unsigned int *max) +{ + u64 cap; + int ret; + + if (data->control_cpu < 0) + return -ENXIO; + + ret = rdmsrl_on_cpu(data->control_cpu, MSR_UNCORE_RATIO_LIMIT, &cap); + if (ret) + return ret; + + *max = (cap & 0x7F) * UNCORE_FREQ_KHZ_MULTIPLIER; + *min = ((cap & GENMASK(14, 8)) >> 8) * UNCORE_FREQ_KHZ_MULTIPLIER; + + return 0; +} + +static int uncore_write_control_freq(struct uncore_data *data, unsigned int input, + unsigned int min_max) +{ + int ret; + u64 cap; + + input /= UNCORE_FREQ_KHZ_MULTIPLIER; + if (!input || input > 0x7F) + return -EINVAL; + + if (data->control_cpu < 0) + return -ENXIO; + + ret = rdmsrl_on_cpu(data->control_cpu, MSR_UNCORE_RATIO_LIMIT, &cap); + if (ret) + return ret; + + if (min_max) { + cap &= ~0x7F; + cap |= input; + } else { + cap &= ~GENMASK(14, 8); + cap |= (input << 8); + } + + ret = wrmsrl_on_cpu(data->control_cpu, MSR_UNCORE_RATIO_LIMIT, cap); + if (ret) + return ret; + + data->stored_uncore_data = cap; + + return 0; +} + +static int uncore_read_freq(struct uncore_data *data, unsigned int *freq) +{ + u64 ratio; + int ret; + + if (data->control_cpu < 0) + return -ENXIO; + + ret = rdmsrl_on_cpu(data->control_cpu, MSR_UNCORE_PERF_STATUS, &ratio); + if (ret) + return ret; + + *freq = (ratio & 0x7F) * UNCORE_FREQ_KHZ_MULTIPLIER; + + return 0; +} + +/* Caller provides protection */ +static struct uncore_data *uncore_get_instance(unsigned int cpu) +{ + int id = topology_logical_die_id(cpu); + + if (id >= 0 && id < uncore_max_entries) + return &uncore_instances[id]; + + return NULL; +} + +static int uncore_event_cpu_online(unsigned int cpu) +{ + struct uncore_data *data; + int target; + + /* Check if there is an online cpu in the package for uncore MSR */ + target = cpumask_any_and(&uncore_cpu_mask, topology_die_cpumask(cpu)); + if (target < nr_cpu_ids) + return 0; + + /* Use this CPU on this die as a control CPU */ + cpumask_set_cpu(cpu, &uncore_cpu_mask); + + data = uncore_get_instance(cpu); + if (!data) + return 0; + + data->package_id = topology_physical_package_id(cpu); + data->die_id = topology_die_id(cpu); + + return uncore_freq_add_entry(data, cpu); +} + +static int uncore_event_cpu_offline(unsigned int cpu) +{ + struct uncore_data *data; + int target; + + data = uncore_get_instance(cpu); + if (!data) + return 0; + + /* Check if existing cpu is used for uncore MSRs */ + if (!cpumask_test_and_clear_cpu(cpu, &uncore_cpu_mask)) + return 0; + + /* Find a new cpu to set uncore MSR */ + target = cpumask_any_but(topology_die_cpumask(cpu), cpu); + + if (target < nr_cpu_ids) { + cpumask_set_cpu(target, &uncore_cpu_mask); + uncore_freq_add_entry(data, target); + } else { + uncore_freq_remove_die_entry(data); + } + + return 0; +} + +static int uncore_pm_notify(struct notifier_block *nb, unsigned long mode, + void *_unused) +{ + int i; + + switch (mode) { + case PM_POST_HIBERNATION: + case PM_POST_RESTORE: + case PM_POST_SUSPEND: + for (i = 0; i < uncore_max_entries; ++i) { + struct uncore_data *data = &uncore_instances[i]; + + if (!data || !data->valid || !data->stored_uncore_data) + return 0; + + wrmsrl_on_cpu(data->control_cpu, MSR_UNCORE_RATIO_LIMIT, + data->stored_uncore_data); + } + break; + default: + break; + } + return 0; +} + +static struct notifier_block uncore_pm_nb = { + .notifier_call = uncore_pm_notify, +}; + +static const struct x86_cpu_id intel_uncore_cpu_ids[] = { + X86_MATCH_INTEL_FAM6_MODEL(BROADWELL_G, NULL), + X86_MATCH_INTEL_FAM6_MODEL(BROADWELL_X, NULL), + X86_MATCH_INTEL_FAM6_MODEL(BROADWELL_D, NULL), + X86_MATCH_INTEL_FAM6_MODEL(SKYLAKE_X, NULL), + X86_MATCH_INTEL_FAM6_MODEL(ICELAKE_X, NULL), + X86_MATCH_INTEL_FAM6_MODEL(ICELAKE_D, NULL), + X86_MATCH_INTEL_FAM6_MODEL(SAPPHIRERAPIDS_X, NULL), + X86_MATCH_INTEL_FAM6_MODEL(EMERALDRAPIDS_X, NULL), + {} +}; +MODULE_DEVICE_TABLE(x86cpu, intel_uncore_cpu_ids); + +static int __init intel_uncore_init(void) +{ + const struct x86_cpu_id *id; + int ret; + + if (cpu_feature_enabled(X86_FEATURE_HYPERVISOR)) + return -ENODEV; + + id = x86_match_cpu(intel_uncore_cpu_ids); + if (!id) + return -ENODEV; + + uncore_max_entries = topology_max_packages() * + topology_max_die_per_package(); + uncore_instances = kcalloc(uncore_max_entries, + sizeof(*uncore_instances), GFP_KERNEL); + if (!uncore_instances) + return -ENOMEM; + + ret = uncore_freq_common_init(uncore_read_control_freq, uncore_write_control_freq, + uncore_read_freq); + if (ret) + goto err_free; + + ret = cpuhp_setup_state(CPUHP_AP_ONLINE_DYN, + "platform/x86/uncore-freq:online", + uncore_event_cpu_online, + uncore_event_cpu_offline); + if (ret < 0) + goto err_rem_kobj; + + uncore_hp_state = ret; + + ret = register_pm_notifier(&uncore_pm_nb); + if (ret) + goto err_rem_state; + + return 0; + +err_rem_state: + cpuhp_remove_state(uncore_hp_state); +err_rem_kobj: + uncore_freq_common_exit(); +err_free: + kfree(uncore_instances); + + return ret; +} +module_init(intel_uncore_init) + +static void __exit intel_uncore_exit(void) +{ + int i; + + unregister_pm_notifier(&uncore_pm_nb); + cpuhp_remove_state(uncore_hp_state); + for (i = 0; i < uncore_max_entries; ++i) + uncore_freq_remove_die_entry(&uncore_instances[i]); + uncore_freq_common_exit(); + kfree(uncore_instances); +} +module_exit(intel_uncore_exit) + +MODULE_IMPORT_NS(INTEL_UNCORE_FREQUENCY); +MODULE_LICENSE("GPL v2"); +MODULE_DESCRIPTION("Intel Uncore Frequency Limits Driver"); |