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7bed1b3caa
x86_pkg_temp receives thermal notifications via a callback from a therm_throt driver, where thermal interrupts are processed. This callback is pkg_temp_thermal_platform_thermal_notify. Here to avoid multiple interrupts from cores in a package, we disable the source and also set a variable to avoid scheduling delayed work function. This variable is protected via spin_lock_irqsave. On one buggy platform, we still receiving interrupts even if the source is disabled. This can cause deadlock/lockdep warning, when interrupt is generated while under spinlock in work function. Change spin_lock to spin_lock_irqsave and spin_unlock to spin_unlock_irqrestore as the data it is trying to protect can also be modified in a notification call called from interrupt handler. Signed-off-by: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com> Signed-off-by: Zhang Rui <rui.zhang@intel.com>
651 lines
16 KiB
C
651 lines
16 KiB
C
/*
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* x86_pkg_temp_thermal driver
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* Copyright (c) 2013, Intel Corporation.
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms and conditions of the GNU General Public License,
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* version 2, as published by the Free Software Foundation.
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*
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* This program is distributed in the hope it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*
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* You should have received a copy of the GNU General Public License along with
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* this program; if not, write to the Free Software Foundation, Inc.
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*
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*/
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/err.h>
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#include <linux/param.h>
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#include <linux/device.h>
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#include <linux/platform_device.h>
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#include <linux/cpu.h>
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#include <linux/smp.h>
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#include <linux/slab.h>
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#include <linux/pm.h>
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#include <linux/thermal.h>
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#include <linux/debugfs.h>
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#include <asm/cpu_device_id.h>
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#include <asm/mce.h>
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/*
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* Rate control delay: Idea is to introduce denounce effect
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* This should be long enough to avoid reduce events, when
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* threshold is set to a temperature, which is constantly
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* violated, but at the short enough to take any action.
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* The action can be remove threshold or change it to next
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* interesting setting. Based on experiments, in around
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* every 5 seconds under load will give us a significant
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* temperature change.
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*/
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#define PKG_TEMP_THERMAL_NOTIFY_DELAY 5000
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static int notify_delay_ms = PKG_TEMP_THERMAL_NOTIFY_DELAY;
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module_param(notify_delay_ms, int, 0644);
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MODULE_PARM_DESC(notify_delay_ms,
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"User space notification delay in milli seconds.");
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/* Number of trip points in thermal zone. Currently it can't
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* be more than 2. MSR can allow setting and getting notifications
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* for only 2 thresholds. This define enforces this, if there
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* is some wrong values returned by cpuid for number of thresholds.
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*/
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#define MAX_NUMBER_OF_TRIPS 2
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/* Limit number of package temp zones */
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#define MAX_PKG_TEMP_ZONE_IDS 256
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struct phy_dev_entry {
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struct list_head list;
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u16 phys_proc_id;
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u16 first_cpu;
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u32 tj_max;
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int ref_cnt;
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u32 start_pkg_therm_low;
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u32 start_pkg_therm_high;
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struct thermal_zone_device *tzone;
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};
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/* List maintaining number of package instances */
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static LIST_HEAD(phy_dev_list);
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static DEFINE_MUTEX(phy_dev_list_mutex);
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/* Interrupt to work function schedule queue */
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static DEFINE_PER_CPU(struct delayed_work, pkg_temp_thermal_threshold_work);
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/* To track if the work is already scheduled on a package */
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static u8 *pkg_work_scheduled;
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/* Spin lock to prevent races with pkg_work_scheduled */
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static spinlock_t pkg_work_lock;
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static u16 max_phy_id;
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/* Debug counters to show using debugfs */
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static struct dentry *debugfs;
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static unsigned int pkg_interrupt_cnt;
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static unsigned int pkg_work_cnt;
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static int pkg_temp_debugfs_init(void)
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{
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struct dentry *d;
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debugfs = debugfs_create_dir("pkg_temp_thermal", NULL);
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if (!debugfs)
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return -ENOENT;
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d = debugfs_create_u32("pkg_thres_interrupt", S_IRUGO, debugfs,
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(u32 *)&pkg_interrupt_cnt);
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if (!d)
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goto err_out;
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d = debugfs_create_u32("pkg_thres_work", S_IRUGO, debugfs,
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(u32 *)&pkg_work_cnt);
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if (!d)
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goto err_out;
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return 0;
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err_out:
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debugfs_remove_recursive(debugfs);
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return -ENOENT;
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}
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static struct phy_dev_entry
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*pkg_temp_thermal_get_phy_entry(unsigned int cpu)
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{
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u16 phys_proc_id = topology_physical_package_id(cpu);
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struct phy_dev_entry *phy_ptr;
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mutex_lock(&phy_dev_list_mutex);
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list_for_each_entry(phy_ptr, &phy_dev_list, list)
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if (phy_ptr->phys_proc_id == phys_proc_id) {
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mutex_unlock(&phy_dev_list_mutex);
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return phy_ptr;
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}
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mutex_unlock(&phy_dev_list_mutex);
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return NULL;
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}
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/*
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* tj-max is is interesting because threshold is set relative to this
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* temperature.
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*/
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static int get_tj_max(int cpu, u32 *tj_max)
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{
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u32 eax, edx;
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u32 val;
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int err;
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err = rdmsr_safe_on_cpu(cpu, MSR_IA32_TEMPERATURE_TARGET, &eax, &edx);
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if (err)
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goto err_ret;
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else {
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val = (eax >> 16) & 0xff;
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if (val)
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*tj_max = val * 1000;
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else {
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err = -EINVAL;
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goto err_ret;
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}
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}
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return 0;
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err_ret:
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*tj_max = 0;
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return err;
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}
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static int sys_get_curr_temp(struct thermal_zone_device *tzd, unsigned long *temp)
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{
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u32 eax, edx;
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struct phy_dev_entry *phy_dev_entry;
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phy_dev_entry = tzd->devdata;
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rdmsr_on_cpu(phy_dev_entry->first_cpu, MSR_IA32_PACKAGE_THERM_STATUS,
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&eax, &edx);
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if (eax & 0x80000000) {
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*temp = phy_dev_entry->tj_max -
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((eax >> 16) & 0x7f) * 1000;
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pr_debug("sys_get_curr_temp %ld\n", *temp);
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return 0;
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}
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return -EINVAL;
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}
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static int sys_get_trip_temp(struct thermal_zone_device *tzd,
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int trip, unsigned long *temp)
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{
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u32 eax, edx;
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struct phy_dev_entry *phy_dev_entry;
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u32 mask, shift;
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unsigned long thres_reg_value;
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int ret;
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if (trip >= MAX_NUMBER_OF_TRIPS)
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return -EINVAL;
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phy_dev_entry = tzd->devdata;
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if (trip) {
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mask = THERM_MASK_THRESHOLD1;
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shift = THERM_SHIFT_THRESHOLD1;
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} else {
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mask = THERM_MASK_THRESHOLD0;
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shift = THERM_SHIFT_THRESHOLD0;
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}
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ret = rdmsr_on_cpu(phy_dev_entry->first_cpu,
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MSR_IA32_PACKAGE_THERM_INTERRUPT, &eax, &edx);
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if (ret < 0)
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return -EINVAL;
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thres_reg_value = (eax & mask) >> shift;
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if (thres_reg_value)
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*temp = phy_dev_entry->tj_max - thres_reg_value * 1000;
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else
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*temp = 0;
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pr_debug("sys_get_trip_temp %ld\n", *temp);
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return 0;
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}
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int sys_set_trip_temp(struct thermal_zone_device *tzd, int trip,
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unsigned long temp)
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{
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u32 l, h;
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struct phy_dev_entry *phy_dev_entry;
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u32 mask, shift, intr;
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int ret;
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phy_dev_entry = tzd->devdata;
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if (trip >= MAX_NUMBER_OF_TRIPS || temp >= phy_dev_entry->tj_max)
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return -EINVAL;
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ret = rdmsr_on_cpu(phy_dev_entry->first_cpu,
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MSR_IA32_PACKAGE_THERM_INTERRUPT,
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&l, &h);
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if (ret < 0)
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return -EINVAL;
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if (trip) {
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mask = THERM_MASK_THRESHOLD1;
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shift = THERM_SHIFT_THRESHOLD1;
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intr = THERM_INT_THRESHOLD1_ENABLE;
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} else {
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mask = THERM_MASK_THRESHOLD0;
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shift = THERM_SHIFT_THRESHOLD0;
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intr = THERM_INT_THRESHOLD0_ENABLE;
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}
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l &= ~mask;
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/*
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* When users space sets a trip temperature == 0, which is indication
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* that, it is no longer interested in receiving notifications.
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*/
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if (!temp)
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l &= ~intr;
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else {
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l |= (phy_dev_entry->tj_max - temp)/1000 << shift;
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l |= intr;
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}
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return wrmsr_on_cpu(phy_dev_entry->first_cpu,
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MSR_IA32_PACKAGE_THERM_INTERRUPT,
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l, h);
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}
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static int sys_get_trip_type(struct thermal_zone_device *thermal,
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int trip, enum thermal_trip_type *type)
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{
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*type = THERMAL_TRIP_PASSIVE;
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return 0;
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}
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/* Thermal zone callback registry */
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static struct thermal_zone_device_ops tzone_ops = {
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.get_temp = sys_get_curr_temp,
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.get_trip_temp = sys_get_trip_temp,
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.get_trip_type = sys_get_trip_type,
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.set_trip_temp = sys_set_trip_temp,
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};
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static bool pkg_temp_thermal_platform_thermal_rate_control(void)
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{
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return true;
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}
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/* Enable threshold interrupt on local package/cpu */
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static inline void enable_pkg_thres_interrupt(void)
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{
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u32 l, h;
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u8 thres_0, thres_1;
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rdmsr(MSR_IA32_PACKAGE_THERM_INTERRUPT, l, h);
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/* only enable/disable if it had valid threshold value */
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thres_0 = (l & THERM_MASK_THRESHOLD0) >> THERM_SHIFT_THRESHOLD0;
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thres_1 = (l & THERM_MASK_THRESHOLD1) >> THERM_SHIFT_THRESHOLD1;
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if (thres_0)
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l |= THERM_INT_THRESHOLD0_ENABLE;
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if (thres_1)
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l |= THERM_INT_THRESHOLD1_ENABLE;
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wrmsr(MSR_IA32_PACKAGE_THERM_INTERRUPT, l, h);
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}
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/* Disable threshold interrupt on local package/cpu */
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static inline void disable_pkg_thres_interrupt(void)
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{
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u32 l, h;
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rdmsr(MSR_IA32_PACKAGE_THERM_INTERRUPT, l, h);
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wrmsr(MSR_IA32_PACKAGE_THERM_INTERRUPT,
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l & (~THERM_INT_THRESHOLD0_ENABLE) &
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(~THERM_INT_THRESHOLD1_ENABLE), h);
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}
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static void pkg_temp_thermal_threshold_work_fn(struct work_struct *work)
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{
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__u64 msr_val;
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int cpu = smp_processor_id();
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int phy_id = topology_physical_package_id(cpu);
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struct phy_dev_entry *phdev = pkg_temp_thermal_get_phy_entry(cpu);
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bool notify = false;
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unsigned long flags;
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if (!phdev)
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return;
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spin_lock_irqsave(&pkg_work_lock, flags);
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++pkg_work_cnt;
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if (unlikely(phy_id > max_phy_id)) {
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spin_unlock_irqrestore(&pkg_work_lock, flags);
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return;
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}
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pkg_work_scheduled[phy_id] = 0;
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spin_unlock_irqrestore(&pkg_work_lock, flags);
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enable_pkg_thres_interrupt();
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rdmsrl(MSR_IA32_PACKAGE_THERM_STATUS, msr_val);
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if (msr_val & THERM_LOG_THRESHOLD0) {
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wrmsrl(MSR_IA32_PACKAGE_THERM_STATUS,
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msr_val & ~THERM_LOG_THRESHOLD0);
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notify = true;
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}
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if (msr_val & THERM_LOG_THRESHOLD1) {
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wrmsrl(MSR_IA32_PACKAGE_THERM_STATUS,
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msr_val & ~THERM_LOG_THRESHOLD1);
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notify = true;
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}
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if (notify) {
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pr_debug("thermal_zone_device_update\n");
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thermal_zone_device_update(phdev->tzone);
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}
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}
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static int pkg_temp_thermal_platform_thermal_notify(__u64 msr_val)
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{
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unsigned long flags;
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int cpu = smp_processor_id();
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int phy_id = topology_physical_package_id(cpu);
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/*
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* When a package is in interrupted state, all CPU's in that package
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* are in the same interrupt state. So scheduling on any one CPU in
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* the package is enough and simply return for others.
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*/
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spin_lock_irqsave(&pkg_work_lock, flags);
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++pkg_interrupt_cnt;
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if (unlikely(phy_id > max_phy_id) || unlikely(!pkg_work_scheduled) ||
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pkg_work_scheduled[phy_id]) {
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disable_pkg_thres_interrupt();
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spin_unlock_irqrestore(&pkg_work_lock, flags);
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return -EINVAL;
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}
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pkg_work_scheduled[phy_id] = 1;
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spin_unlock_irqrestore(&pkg_work_lock, flags);
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disable_pkg_thres_interrupt();
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schedule_delayed_work_on(cpu,
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&per_cpu(pkg_temp_thermal_threshold_work, cpu),
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msecs_to_jiffies(notify_delay_ms));
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return 0;
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}
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static int find_siblings_cpu(int cpu)
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{
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int i;
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int id = topology_physical_package_id(cpu);
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for_each_online_cpu(i)
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if (i != cpu && topology_physical_package_id(i) == id)
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return i;
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return 0;
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}
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static int pkg_temp_thermal_device_add(unsigned int cpu)
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{
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int err;
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u32 tj_max;
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struct phy_dev_entry *phy_dev_entry;
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char buffer[30];
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int thres_count;
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u32 eax, ebx, ecx, edx;
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u8 *temp;
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unsigned long flags;
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cpuid(6, &eax, &ebx, &ecx, &edx);
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thres_count = ebx & 0x07;
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if (!thres_count)
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return -ENODEV;
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if (topology_physical_package_id(cpu) > MAX_PKG_TEMP_ZONE_IDS)
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return -ENODEV;
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thres_count = clamp_val(thres_count, 0, MAX_NUMBER_OF_TRIPS);
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err = get_tj_max(cpu, &tj_max);
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if (err)
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goto err_ret;
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mutex_lock(&phy_dev_list_mutex);
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phy_dev_entry = kzalloc(sizeof(*phy_dev_entry), GFP_KERNEL);
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if (!phy_dev_entry) {
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err = -ENOMEM;
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goto err_ret_unlock;
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}
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spin_lock_irqsave(&pkg_work_lock, flags);
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if (topology_physical_package_id(cpu) > max_phy_id)
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max_phy_id = topology_physical_package_id(cpu);
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temp = krealloc(pkg_work_scheduled,
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(max_phy_id+1) * sizeof(u8), GFP_ATOMIC);
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if (!temp) {
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spin_unlock_irqrestore(&pkg_work_lock, flags);
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err = -ENOMEM;
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goto err_ret_free;
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}
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pkg_work_scheduled = temp;
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pkg_work_scheduled[topology_physical_package_id(cpu)] = 0;
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spin_unlock_irqrestore(&pkg_work_lock, flags);
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phy_dev_entry->phys_proc_id = topology_physical_package_id(cpu);
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phy_dev_entry->first_cpu = cpu;
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phy_dev_entry->tj_max = tj_max;
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phy_dev_entry->ref_cnt = 1;
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snprintf(buffer, sizeof(buffer), "pkg-temp-%d\n",
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phy_dev_entry->phys_proc_id);
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phy_dev_entry->tzone = thermal_zone_device_register(buffer,
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thres_count,
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(thres_count == MAX_NUMBER_OF_TRIPS) ?
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0x03 : 0x01,
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phy_dev_entry, &tzone_ops, NULL, 0, 0);
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if (IS_ERR(phy_dev_entry->tzone)) {
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err = PTR_ERR(phy_dev_entry->tzone);
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goto err_ret_free;
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}
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/* Store MSR value for package thermal interrupt, to restore at exit */
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rdmsr_on_cpu(cpu, MSR_IA32_PACKAGE_THERM_INTERRUPT,
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&phy_dev_entry->start_pkg_therm_low,
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&phy_dev_entry->start_pkg_therm_high);
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list_add_tail(&phy_dev_entry->list, &phy_dev_list);
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pr_debug("pkg_temp_thermal_device_add :phy_id %d cpu %d\n",
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phy_dev_entry->phys_proc_id, cpu);
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mutex_unlock(&phy_dev_list_mutex);
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return 0;
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err_ret_free:
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kfree(phy_dev_entry);
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err_ret_unlock:
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mutex_unlock(&phy_dev_list_mutex);
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err_ret:
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return err;
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}
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static int pkg_temp_thermal_device_remove(unsigned int cpu)
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{
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struct phy_dev_entry *n;
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u16 phys_proc_id = topology_physical_package_id(cpu);
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struct phy_dev_entry *phdev =
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pkg_temp_thermal_get_phy_entry(cpu);
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if (!phdev)
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return -ENODEV;
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mutex_lock(&phy_dev_list_mutex);
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/* 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_PTS },
|
|
{}
|
|
};
|
|
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:
|
|
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 <srinivas.pandruvada@linux.intel.com>");
|
|
MODULE_LICENSE("GPL v2");
|