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7fdc74da94
Commit 239708a3af
("ACPI: Split out ACPI PSS from ACPI Processor
driver"), moves processor thermal registration to acpi_pss_perf_init(),
which doesn't get executed if ACPI_CPU_FREQ_PSS is not enabled.
As ARM64 supports P-states using CPPC, it should be possible to also
support processor passive cooling even if PSS is not enabled. Split
out the processor thermal cooling register from ACPI PSS to support
this, and move it into a separate function in processor_thermal.c.
Signed-off-by: Riwen Lu <luriwen@kylinos.cn>
Reviewed-by: Punit Agrawal <punit.agrawal@bytedance.com>
[ rjw: Subject edits ]
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
323 lines
7.2 KiB
C
323 lines
7.2 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* processor_thermal.c - Passive cooling submodule of the ACPI processor driver
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*
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* Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com>
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* Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
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* Copyright (C) 2004 Dominik Brodowski <linux@brodo.de>
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* Copyright (C) 2004 Anil S Keshavamurthy <anil.s.keshavamurthy@intel.com>
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* - Added processor hotplug support
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/cpufreq.h>
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#include <linux/acpi.h>
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#include <acpi/processor.h>
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#include <linux/uaccess.h>
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#ifdef CONFIG_CPU_FREQ
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/* If a passive cooling situation is detected, primarily CPUfreq is used, as it
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* offers (in most cases) voltage scaling in addition to frequency scaling, and
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* thus a cubic (instead of linear) reduction of energy. Also, we allow for
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* _any_ cpufreq driver and not only the acpi-cpufreq driver.
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*/
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#define CPUFREQ_THERMAL_MIN_STEP 0
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#define CPUFREQ_THERMAL_MAX_STEP 3
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static DEFINE_PER_CPU(unsigned int, cpufreq_thermal_reduction_pctg);
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#define reduction_pctg(cpu) \
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per_cpu(cpufreq_thermal_reduction_pctg, phys_package_first_cpu(cpu))
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/*
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* Emulate "per package data" using per cpu data (which should really be
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* provided elsewhere)
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*
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* Note we can lose a CPU on cpu hotunplug, in this case we forget the state
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* temporarily. Fortunately that's not a big issue here (I hope)
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*/
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static int phys_package_first_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 (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 cpu_has_cpufreq(unsigned int cpu)
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{
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struct cpufreq_policy *policy;
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if (!acpi_processor_cpufreq_init)
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return 0;
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policy = cpufreq_cpu_get(cpu);
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if (policy) {
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cpufreq_cpu_put(policy);
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return 1;
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}
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return 0;
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}
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static int cpufreq_get_max_state(unsigned int cpu)
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{
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if (!cpu_has_cpufreq(cpu))
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return 0;
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return CPUFREQ_THERMAL_MAX_STEP;
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}
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static int cpufreq_get_cur_state(unsigned int cpu)
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{
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if (!cpu_has_cpufreq(cpu))
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return 0;
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return reduction_pctg(cpu);
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}
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static int cpufreq_set_cur_state(unsigned int cpu, int state)
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{
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struct cpufreq_policy *policy;
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struct acpi_processor *pr;
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unsigned long max_freq;
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int i, ret;
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if (!cpu_has_cpufreq(cpu))
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return 0;
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reduction_pctg(cpu) = state;
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/*
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* Update all the CPUs in the same package because they all
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* contribute to the temperature and often share the same
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* frequency.
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*/
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for_each_online_cpu(i) {
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if (topology_physical_package_id(i) !=
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topology_physical_package_id(cpu))
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continue;
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pr = per_cpu(processors, i);
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if (unlikely(!freq_qos_request_active(&pr->thermal_req)))
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continue;
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policy = cpufreq_cpu_get(i);
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if (!policy)
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return -EINVAL;
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max_freq = (policy->cpuinfo.max_freq * (100 - reduction_pctg(i) * 20)) / 100;
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cpufreq_cpu_put(policy);
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ret = freq_qos_update_request(&pr->thermal_req, max_freq);
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if (ret < 0) {
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pr_warn("Failed to update thermal freq constraint: CPU%d (%d)\n",
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pr->id, ret);
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}
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}
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return 0;
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}
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void acpi_thermal_cpufreq_init(struct cpufreq_policy *policy)
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{
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unsigned int cpu;
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for_each_cpu(cpu, policy->related_cpus) {
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struct acpi_processor *pr = per_cpu(processors, cpu);
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int ret;
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if (!pr)
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continue;
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ret = freq_qos_add_request(&policy->constraints,
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&pr->thermal_req,
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FREQ_QOS_MAX, INT_MAX);
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if (ret < 0)
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pr_err("Failed to add freq constraint for CPU%d (%d)\n",
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cpu, ret);
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}
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}
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void acpi_thermal_cpufreq_exit(struct cpufreq_policy *policy)
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{
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unsigned int cpu;
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for_each_cpu(cpu, policy->related_cpus) {
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struct acpi_processor *pr = per_cpu(processors, policy->cpu);
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if (pr)
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freq_qos_remove_request(&pr->thermal_req);
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}
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}
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#else /* ! CONFIG_CPU_FREQ */
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static int cpufreq_get_max_state(unsigned int cpu)
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{
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return 0;
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}
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static int cpufreq_get_cur_state(unsigned int cpu)
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{
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return 0;
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}
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static int cpufreq_set_cur_state(unsigned int cpu, int state)
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{
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return 0;
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}
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#endif
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/* thermal cooling device callbacks */
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static int acpi_processor_max_state(struct acpi_processor *pr)
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{
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int max_state = 0;
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/*
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* There exists four states according to
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* cpufreq_thermal_reduction_pctg. 0, 1, 2, 3
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*/
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max_state += cpufreq_get_max_state(pr->id);
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if (pr->flags.throttling)
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max_state += (pr->throttling.state_count -1);
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return max_state;
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}
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static int
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processor_get_max_state(struct thermal_cooling_device *cdev,
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unsigned long *state)
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{
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struct acpi_device *device = cdev->devdata;
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struct acpi_processor *pr;
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if (!device)
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return -EINVAL;
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pr = acpi_driver_data(device);
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if (!pr)
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return -EINVAL;
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*state = acpi_processor_max_state(pr);
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return 0;
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}
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static int
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processor_get_cur_state(struct thermal_cooling_device *cdev,
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unsigned long *cur_state)
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{
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struct acpi_device *device = cdev->devdata;
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struct acpi_processor *pr;
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if (!device)
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return -EINVAL;
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pr = acpi_driver_data(device);
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if (!pr)
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return -EINVAL;
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*cur_state = cpufreq_get_cur_state(pr->id);
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if (pr->flags.throttling)
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*cur_state += pr->throttling.state;
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return 0;
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}
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static int
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processor_set_cur_state(struct thermal_cooling_device *cdev,
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unsigned long state)
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{
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struct acpi_device *device = cdev->devdata;
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struct acpi_processor *pr;
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int result = 0;
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int max_pstate;
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if (!device)
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return -EINVAL;
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pr = acpi_driver_data(device);
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if (!pr)
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return -EINVAL;
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max_pstate = cpufreq_get_max_state(pr->id);
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if (state > acpi_processor_max_state(pr))
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return -EINVAL;
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if (state <= max_pstate) {
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if (pr->flags.throttling && pr->throttling.state)
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result = acpi_processor_set_throttling(pr, 0, false);
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cpufreq_set_cur_state(pr->id, state);
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} else {
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cpufreq_set_cur_state(pr->id, max_pstate);
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result = acpi_processor_set_throttling(pr,
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state - max_pstate, false);
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}
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return result;
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}
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const struct thermal_cooling_device_ops processor_cooling_ops = {
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.get_max_state = processor_get_max_state,
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.get_cur_state = processor_get_cur_state,
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.set_cur_state = processor_set_cur_state,
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};
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int acpi_processor_thermal_init(struct acpi_processor *pr,
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struct acpi_device *device)
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{
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int result = 0;
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pr->cdev = thermal_cooling_device_register("Processor", device,
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&processor_cooling_ops);
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if (IS_ERR(pr->cdev)) {
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result = PTR_ERR(pr->cdev);
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return result;
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}
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dev_dbg(&device->dev, "registered as cooling_device%d\n",
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pr->cdev->id);
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result = sysfs_create_link(&device->dev.kobj,
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&pr->cdev->device.kobj,
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"thermal_cooling");
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if (result) {
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dev_err(&device->dev,
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"Failed to create sysfs link 'thermal_cooling'\n");
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goto err_thermal_unregister;
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}
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result = sysfs_create_link(&pr->cdev->device.kobj,
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&device->dev.kobj,
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"device");
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if (result) {
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dev_err(&pr->cdev->device,
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"Failed to create sysfs link 'device'\n");
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goto err_remove_sysfs_thermal;
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}
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return 0;
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err_remove_sysfs_thermal:
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sysfs_remove_link(&device->dev.kobj, "thermal_cooling");
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err_thermal_unregister:
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thermal_cooling_device_unregister(pr->cdev);
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return result;
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}
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void acpi_processor_thermal_exit(struct acpi_processor *pr,
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struct acpi_device *device)
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{
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if (pr->cdev) {
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sysfs_remove_link(&device->dev.kobj, "thermal_cooling");
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sysfs_remove_link(&pr->cdev->device.kobj, "device");
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thermal_cooling_device_unregister(pr->cdev);
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pr->cdev = NULL;
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}
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}
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