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![Kay Sievers](/assets/img/avatar_default.png)
This moves the 'cpu sysdev_class' over to a regular 'cpu' subsystem and converts the devices to regular devices. The sysdev drivers are implemented as subsystem interfaces now. After all sysdev classes are ported to regular driver core entities, the sysdev implementation will be entirely removed from the kernel. Userspace relies on events and generic sysfs subsystem infrastructure from sysdev devices, which are made available with this conversion. Cc: Haavard Skinnemoen <hskinnemoen@gmail.com> Cc: Hans-Christian Egtvedt <egtvedt@samfundet.no> Cc: Tony Luck <tony.luck@intel.com> Cc: Fenghua Yu <fenghua.yu@intel.com> Cc: Arnd Bergmann <arnd@arndb.de> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Cc: Paul Mackerras <paulus@samba.org> Cc: Martin Schwidefsky <schwidefsky@de.ibm.com> Cc: Heiko Carstens <heiko.carstens@de.ibm.com> Cc: Paul Mundt <lethal@linux-sh.org> Cc: "David S. Miller" <davem@davemloft.net> Cc: Chris Metcalf <cmetcalf@tilera.com> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Ingo Molnar <mingo@redhat.com> Cc: "H. Peter Anvin" <hpa@zytor.com> Cc: Borislav Petkov <bp@amd64.org> Cc: Tigran Aivazian <tigran@aivazian.fsnet.co.uk> Cc: Len Brown <lenb@kernel.org> Cc: Zhang Rui <rui.zhang@intel.com> Cc: Dave Jones <davej@redhat.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Russell King <rmk+kernel@arm.linux.org.uk> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: Arjan van de Ven <arjan@linux.intel.com> Cc: "Rafael J. Wysocki" <rjw@sisk.pl> Cc: "Srivatsa S. Bhat" <srivatsa.bhat@linux.vnet.ibm.com> Signed-off-by: Kay Sievers <kay.sievers@vrfy.org> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
250 lines
6.2 KiB
C
250 lines
6.2 KiB
C
/*
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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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* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or (at
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* your option) any later version.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
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*
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* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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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 <asm/uaccess.h>
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#include <acpi/acpi_bus.h>
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#include <acpi/processor.h>
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#include <acpi/acpi_drivers.h>
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#define PREFIX "ACPI: "
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#define ACPI_PROCESSOR_CLASS "processor"
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#define _COMPONENT ACPI_PROCESSOR_COMPONENT
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ACPI_MODULE_NAME("processor_thermal");
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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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static unsigned int acpi_thermal_cpufreq_is_init = 0;
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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_thermal_cpufreq_is_init || cpufreq_get_policy(&policy, cpu))
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return 0;
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return 1;
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}
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static int acpi_thermal_cpufreq_notifier(struct notifier_block *nb,
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unsigned long event, void *data)
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{
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struct cpufreq_policy *policy = data;
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unsigned long max_freq = 0;
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if (event != CPUFREQ_ADJUST)
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goto out;
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max_freq = (
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policy->cpuinfo.max_freq *
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(100 - per_cpu(cpufreq_thermal_reduction_pctg, policy->cpu) * 20)
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) / 100;
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cpufreq_verify_within_limits(policy, 0, max_freq);
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out:
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return 0;
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}
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static struct notifier_block acpi_thermal_cpufreq_notifier_block = {
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.notifier_call = acpi_thermal_cpufreq_notifier,
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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 per_cpu(cpufreq_thermal_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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if (!cpu_has_cpufreq(cpu))
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return 0;
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per_cpu(cpufreq_thermal_reduction_pctg, cpu) = state;
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cpufreq_update_policy(cpu);
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return 0;
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}
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void acpi_thermal_cpufreq_init(void)
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{
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int i;
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for (i = 0; i < nr_cpu_ids; i++)
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if (cpu_present(i))
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per_cpu(cpufreq_thermal_reduction_pctg, i) = 0;
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i = cpufreq_register_notifier(&acpi_thermal_cpufreq_notifier_block,
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CPUFREQ_POLICY_NOTIFIER);
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if (!i)
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acpi_thermal_cpufreq_is_init = 1;
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}
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void acpi_thermal_cpufreq_exit(void)
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{
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if (acpi_thermal_cpufreq_is_init)
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cpufreq_unregister_notifier
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(&acpi_thermal_cpufreq_notifier_block,
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CPUFREQ_POLICY_NOTIFIER);
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acpi_thermal_cpufreq_is_init = 0;
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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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int acpi_processor_get_limit_info(struct acpi_processor *pr)
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{
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if (!pr)
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return -EINVAL;
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if (pr->flags.throttling)
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pr->flags.limit = 1;
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return 0;
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}
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/* thermal coolign 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_ptg. 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 = acpi_driver_data(device);
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if (!device || !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 = acpi_driver_data(device);
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if (!device || !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 = acpi_driver_data(device);
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int result = 0;
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int max_pstate;
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if (!device || !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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