diff --git a/Documentation/thermal/x86_pkg_temperature_thermal b/Documentation/thermal/x86_pkg_temperature_thermal new file mode 100644 index 000000000000..17a3a4c0a0ca --- /dev/null +++ b/Documentation/thermal/x86_pkg_temperature_thermal @@ -0,0 +1,47 @@ +Kernel driver: x86_pkg_temp_thermal +=================== + +Supported chips: +* x86: with package level thermal management +(Verify using: CPUID.06H:EAX[bit 6] =1) + +Authors: Srinivas Pandruvada + +Reference +--- +Intel® 64 and IA-32 Architectures Software Developer’s Manual (Jan, 2013): +Chapter 14.6: PACKAGE LEVEL THERMAL MANAGEMENT + +Description +--------- + +This driver register CPU digital temperature package level sensor as a thermal +zone with maximum two user mode configurable trip points. Number of trip points +depends on the capability of the package. Once the trip point is violated, +user mode can receive notification via thermal notification mechanism and can +take any action to control temperature. + + +Threshold management +-------------------- +Each package will register as a thermal zone under /sys/class/thermal. +Example: +/sys/class/thermal/thermal_zone1 + +This contains two trip points: +- trip_point_0_temp +- trip_point_1_temp + +User can set any temperature between 0 to TJ-Max temperature. Temperature units +are in milli-degree Celsius. Refer to "Documentation/thermal/sysfs-api.txt" for +thermal sys-fs details. + +Any value other than 0 in these trip points, can trigger thermal notifications. +Setting 0, stops sending thermal notifications. + +Thermal notifications: To get kobject-uevent notifications, set the thermal zone +policy to "user_space". For example: echo -n "user_space" > policy + + + + diff --git a/arch/x86/include/asm/mce.h b/arch/x86/include/asm/mce.h index fa5f71e021d5..16a214557a58 100644 --- a/arch/x86/include/asm/mce.h +++ b/arch/x86/include/asm/mce.h @@ -214,6 +214,13 @@ void mce_log_therm_throt_event(__u64 status); /* 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); + #ifdef CONFIG_X86_THERMAL_VECTOR extern void mcheck_intel_therm_init(void); #else diff --git a/arch/x86/kernel/cpu/mcheck/therm_throt.c b/arch/x86/kernel/cpu/mcheck/therm_throt.c index 47a1870279aa..4131c0393594 100644 --- a/arch/x86/kernel/cpu/mcheck/therm_throt.c +++ b/arch/x86/kernel/cpu/mcheck/therm_throt.c @@ -54,12 +54,24 @@ struct thermal_state { struct _thermal_state package_power_limit; struct _thermal_state core_thresh0; struct _thermal_state core_thresh1; + struct _thermal_state pkg_thresh0; + struct _thermal_state pkg_thresh1; }; /* Callback to handle core threshold interrupts */ int (*platform_thermal_notify)(__u64 msr_val); EXPORT_SYMBOL(platform_thermal_notify); +/* Callback to handle core package threshold_interrupts */ +int (*platform_thermal_package_notify)(__u64 msr_val); +EXPORT_SYMBOL_GPL(platform_thermal_package_notify); + +/* Callback support of rate control, return true, if + * callback has rate control */ +bool (*platform_thermal_package_rate_control)(void); +EXPORT_SYMBOL_GPL(platform_thermal_package_rate_control); + + static DEFINE_PER_CPU(struct thermal_state, thermal_state); static atomic_t therm_throt_en = ATOMIC_INIT(0); @@ -203,19 +215,25 @@ static int therm_throt_process(bool new_event, int event, int level) return 0; } -static int thresh_event_valid(int event) +static int thresh_event_valid(int level, int event) { struct _thermal_state *state; unsigned int this_cpu = smp_processor_id(); struct thermal_state *pstate = &per_cpu(thermal_state, this_cpu); u64 now = get_jiffies_64(); - state = (event == 0) ? &pstate->core_thresh0 : &pstate->core_thresh1; + if (level == PACKAGE_LEVEL) + state = (event == 0) ? &pstate->pkg_thresh0 : + &pstate->pkg_thresh1; + else + state = (event == 0) ? &pstate->core_thresh0 : + &pstate->core_thresh1; if (time_before64(now, state->next_check)) return 0; state->next_check = now + CHECK_INTERVAL; + return 1; } @@ -321,6 +339,39 @@ device_initcall(thermal_throttle_init_device); #endif /* CONFIG_SYSFS */ +static void notify_package_thresholds(__u64 msr_val) +{ + bool notify_thres_0 = false; + bool notify_thres_1 = false; + + if (!platform_thermal_package_notify) + return; + + /* lower threshold check */ + if (msr_val & THERM_LOG_THRESHOLD0) + notify_thres_0 = true; + /* higher threshold check */ + if (msr_val & THERM_LOG_THRESHOLD1) + notify_thres_1 = true; + + if (!notify_thres_0 && !notify_thres_1) + return; + + if (platform_thermal_package_rate_control && + platform_thermal_package_rate_control()) { + /* Rate control is implemented in callback */ + platform_thermal_package_notify(msr_val); + return; + } + + /* lower threshold reached */ + if (notify_thres_0 && thresh_event_valid(PACKAGE_LEVEL, 0)) + platform_thermal_package_notify(msr_val); + /* higher threshold reached */ + if (notify_thres_1 && thresh_event_valid(PACKAGE_LEVEL, 1)) + platform_thermal_package_notify(msr_val); +} + static void notify_thresholds(__u64 msr_val) { /* check whether the interrupt handler is defined; @@ -330,10 +381,12 @@ static void notify_thresholds(__u64 msr_val) return; /* lower threshold reached */ - if ((msr_val & THERM_LOG_THRESHOLD0) && thresh_event_valid(0)) + if ((msr_val & THERM_LOG_THRESHOLD0) && + thresh_event_valid(CORE_LEVEL, 0)) platform_thermal_notify(msr_val); /* higher threshold reached */ - if ((msr_val & THERM_LOG_THRESHOLD1) && thresh_event_valid(1)) + if ((msr_val & THERM_LOG_THRESHOLD1) && + thresh_event_valid(CORE_LEVEL, 1)) platform_thermal_notify(msr_val); } @@ -359,6 +412,8 @@ static void intel_thermal_interrupt(void) if (this_cpu_has(X86_FEATURE_PTS)) { rdmsrl(MSR_IA32_PACKAGE_THERM_STATUS, msr_val); + /* check violations of package thermal thresholds */ + notify_package_thresholds(msr_val); therm_throt_process(msr_val & PACKAGE_THERM_STATUS_PROCHOT, THERMAL_THROTTLING_EVENT, PACKAGE_LEVEL); diff --git a/drivers/thermal/Kconfig b/drivers/thermal/Kconfig index 7205c70a46a3..b13c2bcccb72 100644 --- a/drivers/thermal/Kconfig +++ b/drivers/thermal/Kconfig @@ -169,7 +169,20 @@ 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_PKG_TEMP_THERMAL + tristate "X86 package temperature thermal driver" + depends on THERMAL + depends on X86 + select THERMAL_GOV_USER_SPACE + default m + help + Enable this to register CPU digital sensor for package temperature as + thermal zone. Each package will have its own thermal zone. There are + two trip points which can be set by user to get notifications via thermal + notification methods. + menu "Texas Instruments thermal drivers" source "drivers/thermal/ti-soc-thermal/Kconfig" endmenu + endif diff --git a/drivers/thermal/Makefile b/drivers/thermal/Makefile index 85693941fda0..67184a293e3f 100644 --- a/drivers/thermal/Makefile +++ b/drivers/thermal/Makefile @@ -23,4 +23,5 @@ obj-$(CONFIG_DB8500_THERMAL) += db8500_thermal.o obj-$(CONFIG_ARMADA_THERMAL) += armada_thermal.o obj-$(CONFIG_DB8500_CPUFREQ_COOLING) += db8500_cpufreq_cooling.o obj-$(CONFIG_INTEL_POWERCLAMP) += intel_powerclamp.o +obj-$(CONFIG_X86_PKG_TEMP_THERMAL) += x86_pkg_temp_thermal.o obj-$(CONFIG_TI_SOC_THERMAL) += ti-soc-thermal/ diff --git a/drivers/thermal/x86_pkg_temp_thermal.c b/drivers/thermal/x86_pkg_temp_thermal.c new file mode 100644 index 000000000000..5de56f671a9d --- /dev/null +++ b/drivers/thermal/x86_pkg_temp_thermal.c @@ -0,0 +1,642 @@ +/* + * x86_pkg_temp_thermal driver + * Copyright (c) 2013, Intel Corporation. + * + * This program is free software; you can redistribute it and/or modify it + * under the terms and conditions of the GNU General Public License, + * version 2, as published by the Free Software Foundation. + * + * This program is distributed in the hope it will be useful, but WITHOUT + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for + * more details. + * + * You should have received a copy of the GNU General Public License along with + * this program; if not, write to the Free Software Foundation, Inc. + * + */ +#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +/* +* Rate control delay: Idea is to introduce denounce effect +* This should be long enough to avoid reduce events, when +* threshold is set to a temperature, which is constantly +* violated, but at the short enough to take any action. +* The action can be remove threshold or change it to next +* interesting setting. Based on experiments, in around +* every 5 seconds under load will give us a significant +* temperature change. +*/ +#define PKG_TEMP_THERMAL_NOTIFY_DELAY 5000 +static int notify_delay_ms = PKG_TEMP_THERMAL_NOTIFY_DELAY; +module_param(notify_delay_ms, int, 0644); +MODULE_PARM_DESC(notify_delay_ms, + "User space notification delay in milli seconds."); + +/* Number of trip points in thermal zone. Currently it can't +* be more than 2. MSR can allow setting and getting notifications +* for only 2 thresholds. This define enforces this, if there +* is some wrong values returned by cpuid for number of thresholds. +*/ +#define MAX_NUMBER_OF_TRIPS 2 + +struct phy_dev_entry { + struct list_head list; + u16 phys_proc_id; + u16 first_cpu; + u32 tj_max; + int ref_cnt; + u32 start_pkg_therm_low; + u32 start_pkg_therm_high; + struct thermal_zone_device *tzone; +}; + +/* List maintaining number of package instances */ +static LIST_HEAD(phy_dev_list); +static DEFINE_MUTEX(phy_dev_list_mutex); + +/* Interrupt to work function schedule queue */ +static DEFINE_PER_CPU(struct delayed_work, pkg_temp_thermal_threshold_work); + +/* To track if the work is already scheduled on a package */ +static u8 *pkg_work_scheduled; + +/* Spin lock to prevent races with pkg_work_scheduled */ +static spinlock_t pkg_work_lock; +static u16 max_phy_id; + +/* Debug counters to show using debugfs */ +static struct dentry *debugfs; +static unsigned int pkg_interrupt_cnt; +static unsigned int pkg_work_cnt; + +static int pkg_temp_debugfs_init(void) +{ + struct dentry *d; + + debugfs = debugfs_create_dir("pkg_temp_thermal", NULL); + if (!debugfs) + return -ENOENT; + + d = debugfs_create_u32("pkg_thres_interrupt", S_IRUGO, debugfs, + (u32 *)&pkg_interrupt_cnt); + if (!d) + goto err_out; + + d = debugfs_create_u32("pkg_thres_work", S_IRUGO, debugfs, + (u32 *)&pkg_work_cnt); + if (!d) + goto err_out; + + return 0; + +err_out: + debugfs_remove_recursive(debugfs); + return -ENOENT; +} + +static struct phy_dev_entry + *pkg_temp_thermal_get_phy_entry(unsigned int cpu) +{ + u16 phys_proc_id = topology_physical_package_id(cpu); + struct phy_dev_entry *phy_ptr; + + mutex_lock(&phy_dev_list_mutex); + + list_for_each_entry(phy_ptr, &phy_dev_list, list) + if (phy_ptr->phys_proc_id == phys_proc_id) { + mutex_unlock(&phy_dev_list_mutex); + return phy_ptr; + } + + mutex_unlock(&phy_dev_list_mutex); + + return NULL; +} + +/* +* tj-max is is interesting because threshold is set relative to this +* temperature. +*/ +static int get_tj_max(int cpu, u32 *tj_max) +{ + u32 eax, edx; + u32 val; + int err; + + err = rdmsr_safe_on_cpu(cpu, MSR_IA32_TEMPERATURE_TARGET, &eax, &edx); + if (err) + goto err_ret; + else { + val = (eax >> 16) & 0xff; + if (val) + *tj_max = val * 1000; + else { + err = -EINVAL; + goto err_ret; + } + } + + return 0; +err_ret: + *tj_max = 0; + return err; +} + +static int sys_get_curr_temp(struct thermal_zone_device *tzd, unsigned long *temp) +{ + u32 eax, edx; + struct phy_dev_entry *phy_dev_entry; + + phy_dev_entry = tzd->devdata; + rdmsr_on_cpu(phy_dev_entry->first_cpu, MSR_IA32_PACKAGE_THERM_STATUS, + &eax, &edx); + if (eax & 0x80000000) { + *temp = phy_dev_entry->tj_max - + ((eax >> 16) & 0x7f) * 1000; + pr_debug("sys_get_curr_temp %ld\n", *temp); + return 0; + } + + return -EINVAL; +} + +static int sys_get_trip_temp(struct thermal_zone_device *tzd, + int trip, unsigned long *temp) +{ + u32 eax, edx; + struct phy_dev_entry *phy_dev_entry; + u32 mask, shift; + unsigned long thres_reg_value; + int ret; + + if (trip >= MAX_NUMBER_OF_TRIPS) + return -EINVAL; + + phy_dev_entry = tzd->devdata; + + if (trip) { + mask = THERM_MASK_THRESHOLD1; + shift = THERM_SHIFT_THRESHOLD1; + } else { + mask = THERM_MASK_THRESHOLD0; + shift = THERM_SHIFT_THRESHOLD0; + } + + ret = rdmsr_on_cpu(phy_dev_entry->first_cpu, + MSR_IA32_PACKAGE_THERM_INTERRUPT, &eax, &edx); + if (ret < 0) + return -EINVAL; + + thres_reg_value = (eax & mask) >> shift; + if (thres_reg_value) + *temp = phy_dev_entry->tj_max - thres_reg_value * 1000; + else + *temp = 0; + pr_debug("sys_get_trip_temp %ld\n", *temp); + + return 0; +} + +int sys_set_trip_temp(struct thermal_zone_device *tzd, int trip, + unsigned long temp) +{ + u32 l, h; + struct phy_dev_entry *phy_dev_entry; + u32 mask, shift, intr; + int ret; + + phy_dev_entry = tzd->devdata; + + if (trip >= MAX_NUMBER_OF_TRIPS || temp >= phy_dev_entry->tj_max) + return -EINVAL; + + ret = rdmsr_on_cpu(phy_dev_entry->first_cpu, + MSR_IA32_PACKAGE_THERM_INTERRUPT, + &l, &h); + if (ret < 0) + return -EINVAL; + + if (trip) { + mask = THERM_MASK_THRESHOLD1; + shift = THERM_SHIFT_THRESHOLD1; + intr = THERM_INT_THRESHOLD1_ENABLE; + } else { + mask = THERM_MASK_THRESHOLD0; + shift = THERM_SHIFT_THRESHOLD0; + intr = THERM_INT_THRESHOLD0_ENABLE; + } + l &= ~mask; + /* + * When users space sets a trip temperature == 0, which is indication + * that, it is no longer interested in receiving notifications. + */ + if (!temp) + l &= ~intr; + else { + l |= (phy_dev_entry->tj_max - temp)/1000 << shift; + l |= intr; + } + + return wrmsr_on_cpu(phy_dev_entry->first_cpu, + MSR_IA32_PACKAGE_THERM_INTERRUPT, + l, h); +} + +static int sys_get_trip_type(struct thermal_zone_device *thermal, + int trip, enum thermal_trip_type *type) +{ + + *type = THERMAL_TRIP_PASSIVE; + + return 0; +} + +/* Thermal zone callback registry */ +static struct thermal_zone_device_ops tzone_ops = { + .get_temp = sys_get_curr_temp, + .get_trip_temp = sys_get_trip_temp, + .get_trip_type = sys_get_trip_type, + .set_trip_temp = sys_set_trip_temp, +}; + +static bool pkg_temp_thermal_platform_thermal_rate_control(void) +{ + return true; +} + +/* Enable threshold interrupt on local package/cpu */ +static inline void enable_pkg_thres_interrupt(void) +{ + u32 l, h; + u8 thres_0, thres_1; + + rdmsr(MSR_IA32_PACKAGE_THERM_INTERRUPT, l, h); + /* only enable/disable if it had valid threshold value */ + thres_0 = (l & THERM_MASK_THRESHOLD0) >> THERM_SHIFT_THRESHOLD0; + thres_1 = (l & THERM_MASK_THRESHOLD1) >> THERM_SHIFT_THRESHOLD1; + if (thres_0) + l |= THERM_INT_THRESHOLD0_ENABLE; + if (thres_1) + l |= THERM_INT_THRESHOLD1_ENABLE; + wrmsr(MSR_IA32_PACKAGE_THERM_INTERRUPT, l, h); +} + +/* Disable threshold interrupt on local package/cpu */ +static inline void disable_pkg_thres_interrupt(void) +{ + u32 l, h; + rdmsr(MSR_IA32_PACKAGE_THERM_INTERRUPT, l, h); + wrmsr(MSR_IA32_PACKAGE_THERM_INTERRUPT, + l & (~THERM_INT_THRESHOLD0_ENABLE) & + (~THERM_INT_THRESHOLD1_ENABLE), h); +} + +static void pkg_temp_thermal_threshold_work_fn(struct work_struct *work) +{ + __u64 msr_val; + int cpu = smp_processor_id(); + int phy_id = topology_physical_package_id(cpu); + struct phy_dev_entry *phdev = pkg_temp_thermal_get_phy_entry(cpu); + bool notify = false; + + if (!phdev) + return; + + spin_lock(&pkg_work_lock); + ++pkg_work_cnt; + if (unlikely(phy_id > max_phy_id)) { + spin_unlock(&pkg_work_lock); + return; + } + pkg_work_scheduled[phy_id] = 0; + spin_unlock(&pkg_work_lock); + + enable_pkg_thres_interrupt(); + rdmsrl(MSR_IA32_PACKAGE_THERM_STATUS, msr_val); + if (msr_val & THERM_LOG_THRESHOLD0) { + wrmsrl(MSR_IA32_PACKAGE_THERM_STATUS, + msr_val & ~THERM_LOG_THRESHOLD0); + notify = true; + } + if (msr_val & THERM_LOG_THRESHOLD1) { + wrmsrl(MSR_IA32_PACKAGE_THERM_STATUS, + msr_val & ~THERM_LOG_THRESHOLD1); + notify = true; + } + if (notify) { + pr_debug("thermal_zone_device_update\n"); + thermal_zone_device_update(phdev->tzone); + } +} + +static int pkg_temp_thermal_platform_thermal_notify(__u64 msr_val) +{ + unsigned long flags; + int cpu = smp_processor_id(); + int phy_id = topology_physical_package_id(cpu); + + /* + * When a package is in interrupted state, all CPU's in that package + * are in the same interrupt state. So scheduling on any one CPU in + * the package is enough and simply return for others. + */ + spin_lock_irqsave(&pkg_work_lock, flags); + ++pkg_interrupt_cnt; + if (unlikely(phy_id > max_phy_id) || unlikely(!pkg_work_scheduled) || + pkg_work_scheduled[phy_id]) { + disable_pkg_thres_interrupt(); + spin_unlock_irqrestore(&pkg_work_lock, flags); + return -EINVAL; + } + pkg_work_scheduled[phy_id] = 1; + spin_unlock_irqrestore(&pkg_work_lock, flags); + + disable_pkg_thres_interrupt(); + schedule_delayed_work_on(cpu, + &per_cpu(pkg_temp_thermal_threshold_work, cpu), + msecs_to_jiffies(notify_delay_ms)); + return 0; +} + +static int find_siblings_cpu(int cpu) +{ + int i; + int id = topology_physical_package_id(cpu); + + for_each_online_cpu(i) + if (i != cpu && topology_physical_package_id(i) == id) + return i; + + return 0; +} + +static int pkg_temp_thermal_device_add(unsigned int cpu) +{ + int err; + u32 tj_max; + struct phy_dev_entry *phy_dev_entry; + char buffer[30]; + int thres_count; + u32 eax, ebx, ecx, edx; + + cpuid(6, &eax, &ebx, &ecx, &edx); + thres_count = ebx & 0x07; + if (!thres_count) + return -ENODEV; + + thres_count = clamp_val(thres_count, 0, MAX_NUMBER_OF_TRIPS); + + err = get_tj_max(cpu, &tj_max); + if (err) + goto err_ret; + + mutex_lock(&phy_dev_list_mutex); + + phy_dev_entry = kzalloc(sizeof(*phy_dev_entry), GFP_KERNEL); + if (!phy_dev_entry) { + err = -ENOMEM; + goto err_ret_unlock; + } + + spin_lock(&pkg_work_lock); + if (topology_physical_package_id(cpu) > max_phy_id) + max_phy_id = topology_physical_package_id(cpu); + pkg_work_scheduled = krealloc(pkg_work_scheduled, + (max_phy_id+1) * sizeof(u8), GFP_ATOMIC); + if (!pkg_work_scheduled) { + spin_unlock(&pkg_work_lock); + err = -ENOMEM; + goto err_ret_free; + } + pkg_work_scheduled[topology_physical_package_id(cpu)] = 0; + spin_unlock(&pkg_work_lock); + + phy_dev_entry->phys_proc_id = topology_physical_package_id(cpu); + phy_dev_entry->first_cpu = cpu; + phy_dev_entry->tj_max = tj_max; + phy_dev_entry->ref_cnt = 1; + snprintf(buffer, sizeof(buffer), "pkg-temp-%d\n", + phy_dev_entry->phys_proc_id); + phy_dev_entry->tzone = thermal_zone_device_register(buffer, + thres_count, + (thres_count == MAX_NUMBER_OF_TRIPS) ? + 0x03 : 0x01, + phy_dev_entry, &tzone_ops, NULL, 0, 0); + if (IS_ERR(phy_dev_entry->tzone)) { + err = PTR_ERR(phy_dev_entry->tzone); + goto err_ret_free; + } + /* Store MSR value for package thermal interrupt, to restore at exit */ + rdmsr_on_cpu(cpu, MSR_IA32_PACKAGE_THERM_INTERRUPT, + &phy_dev_entry->start_pkg_therm_low, + &phy_dev_entry->start_pkg_therm_high); + + list_add_tail(&phy_dev_entry->list, &phy_dev_list); + pr_debug("pkg_temp_thermal_device_add :phy_id %d cpu %d\n", + phy_dev_entry->phys_proc_id, cpu); + + mutex_unlock(&phy_dev_list_mutex); + + return 0; + +err_ret_free: + kfree(phy_dev_entry); +err_ret_unlock: + mutex_unlock(&phy_dev_list_mutex); + +err_ret: + return err; +} + +static int pkg_temp_thermal_device_remove(unsigned int cpu) +{ + struct phy_dev_entry *n; + u16 phys_proc_id = topology_physical_package_id(cpu); + struct phy_dev_entry *phdev = + pkg_temp_thermal_get_phy_entry(cpu); + + if (!phdev) + return -ENODEV; + + mutex_lock(&phy_dev_list_mutex); + /* If we are loosing the first cpu for this package, we need change */ + if (phdev->first_cpu == cpu) { + phdev->first_cpu = find_siblings_cpu(cpu); + pr_debug("thermal_device_remove: first cpu switched %d\n", + phdev->first_cpu); + } + /* + * It is possible that no siblings left as this was the last cpu + * going offline. We don't need to worry about this assignment + * as the phydev entry will be removed in this case and + * thermal zone is removed. + */ + --phdev->ref_cnt; + pr_debug("thermal_device_remove: pkg: %d cpu %d ref_cnt %d\n", + phys_proc_id, cpu, phdev->ref_cnt); + if (!phdev->ref_cnt) + list_for_each_entry_safe(phdev, n, &phy_dev_list, list) { + if (phdev->phys_proc_id == phys_proc_id) { + thermal_zone_device_unregister(phdev->tzone); + list_del(&phdev->list); + kfree(phdev); + break; + } + } + mutex_unlock(&phy_dev_list_mutex); + + return 0; +} + +static int get_core_online(unsigned int cpu) +{ + struct cpuinfo_x86 *c = &cpu_data(cpu); + struct phy_dev_entry *phdev = pkg_temp_thermal_get_phy_entry(cpu); + + /* Check if there is already an instance for this package */ + if (!phdev) { + if (!cpu_has(c, X86_FEATURE_DTHERM) && + !cpu_has(c, X86_FEATURE_PTS)) + return -ENODEV; + if (pkg_temp_thermal_device_add(cpu)) + return -ENODEV; + } else { + mutex_lock(&phy_dev_list_mutex); + ++phdev->ref_cnt; + pr_debug("get_core_online: cpu %d ref_cnt %d\n", + cpu, phdev->ref_cnt); + mutex_unlock(&phy_dev_list_mutex); + } + INIT_DELAYED_WORK(&per_cpu(pkg_temp_thermal_threshold_work, cpu), + pkg_temp_thermal_threshold_work_fn); + + pr_debug("get_core_online: cpu %d successful\n", cpu); + + return 0; +} + +static void put_core_offline(unsigned int cpu) +{ + if (!pkg_temp_thermal_device_remove(cpu)) + cancel_delayed_work_sync( + &per_cpu(pkg_temp_thermal_threshold_work, cpu)); + + pr_debug("put_core_offline: cpu %d\n", cpu); +} + +static int pkg_temp_thermal_cpu_callback(struct notifier_block *nfb, + unsigned long action, void *hcpu) +{ + unsigned int cpu = (unsigned long) hcpu; + + switch (action) { + case CPU_ONLINE: + case CPU_DOWN_FAILED: + get_core_online(cpu); + break; + case CPU_DOWN_PREPARE: + put_core_offline(cpu); + break; + } + return NOTIFY_OK; +} + +static struct notifier_block pkg_temp_thermal_notifier __refdata = { + .notifier_call = pkg_temp_thermal_cpu_callback, +}; + +static const struct x86_cpu_id __initconst pkg_temp_thermal_ids[] = { + { X86_VENDOR_INTEL, X86_FAMILY_ANY, X86_MODEL_ANY, X86_FEATURE_DTHERM }, + {} +}; +MODULE_DEVICE_TABLE(x86cpu, pkg_temp_thermal_ids); + +static int __init pkg_temp_thermal_init(void) +{ + int i; + + if (!x86_match_cpu(pkg_temp_thermal_ids)) + return -ENODEV; + + spin_lock_init(&pkg_work_lock); + platform_thermal_package_notify = + pkg_temp_thermal_platform_thermal_notify; + platform_thermal_package_rate_control = + pkg_temp_thermal_platform_thermal_rate_control; + + get_online_cpus(); + for_each_online_cpu(i) + if (get_core_online(i)) + goto err_ret; + register_hotcpu_notifier(&pkg_temp_thermal_notifier); + put_online_cpus(); + + pkg_temp_debugfs_init(); /* Don't care if fails */ + + return 0; + +err_ret: + get_online_cpus(); + for_each_online_cpu(i) + put_core_offline(i); + put_online_cpus(); + kfree(pkg_work_scheduled); + platform_thermal_package_notify = NULL; + platform_thermal_package_rate_control = NULL; + + return -ENODEV; +} + +static void __exit pkg_temp_thermal_exit(void) +{ + struct phy_dev_entry *phdev, *n; + int i; + + get_online_cpus(); + unregister_hotcpu_notifier(&pkg_temp_thermal_notifier); + mutex_lock(&phy_dev_list_mutex); + list_for_each_entry_safe(phdev, n, &phy_dev_list, list) { + /* Retore old MSR value for package thermal interrupt */ + wrmsr_on_cpu(phdev->first_cpu, + MSR_IA32_PACKAGE_THERM_INTERRUPT, + phdev->start_pkg_therm_low, + phdev->start_pkg_therm_high); + thermal_zone_device_unregister(phdev->tzone); + list_del(&phdev->list); + kfree(phdev); + } + mutex_unlock(&phy_dev_list_mutex); + platform_thermal_package_notify = NULL; + platform_thermal_package_rate_control = NULL; + for_each_online_cpu(i) + cancel_delayed_work_sync( + &per_cpu(pkg_temp_thermal_threshold_work, i)); + put_online_cpus(); + + kfree(pkg_work_scheduled); + + debugfs_remove_recursive(debugfs); +} + +module_init(pkg_temp_thermal_init) +module_exit(pkg_temp_thermal_exit) + +MODULE_DESCRIPTION("X86 PKG TEMP Thermal Driver"); +MODULE_AUTHOR("Srinivas Pandruvada "); +MODULE_LICENSE("GPL v2");