0d4ac62a35
cpufreq_pre_change is called before the change, giving each driver a chance to revoke the change. cpufreq_post_change provides the results of the change (success or failure). cpufreq_levels_changed gives the unit number of the cpufreq device whose number of available levels has changed. Hook in all the drivers I could find that needed it. * TSC: update TSC frequency value. When the available levels change, take the highest possible level and notify the timecounter set_cputicker() of that freq. This gets rid of the "calcru: runtime went backwards" messages. * identcpu: updates the sysctl hw.clockrate value * Profiling: if profiling is active when the clock changes, let the user know the results may be inaccurate. Reviewed by: bde, phk MFC after: 1 month
164 lines
6.1 KiB
C
164 lines
6.1 KiB
C
/*-
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* Copyright (c) 2005-2007 Nate Lawson (SDG)
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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#ifndef _SYS_CPU_H_
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#define _SYS_CPU_H_
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#include <sys/eventhandler.h>
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/*
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* CPU device support.
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*/
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#define CPU_IVAR_PCPU 1
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static __inline struct pcpu *cpu_get_pcpu(device_t dev)
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{
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uintptr_t v = 0;
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BUS_READ_IVAR(device_get_parent(dev), dev, CPU_IVAR_PCPU, &v);
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return ((struct pcpu *)v);
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}
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/*
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* CPU frequency control interface.
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*/
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/* Each driver's CPU frequency setting is exported in this format. */
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struct cf_setting {
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int freq; /* CPU clock in Mhz or 100ths of a percent. */
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int volts; /* Voltage in mV. */
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int power; /* Power consumed in mW. */
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int lat; /* Transition latency in us. */
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device_t dev; /* Driver providing this setting. */
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int spec[4];/* Driver-specific storage for non-standard info. */
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};
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/* Maximum number of settings a given driver can have. */
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#define MAX_SETTINGS 24
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/* A combination of settings is a level. */
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struct cf_level {
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struct cf_setting total_set;
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struct cf_setting abs_set;
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struct cf_setting rel_set[MAX_SETTINGS];
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int rel_count;
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TAILQ_ENTRY(cf_level) link;
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};
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TAILQ_HEAD(cf_level_lst, cf_level);
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/* Drivers should set all unknown values to this. */
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#define CPUFREQ_VAL_UNKNOWN (-1)
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/*
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* Every driver offers a type of CPU control. Absolute levels are mutually
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* exclusive while relative levels modify the current absolute level. There
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* may be multiple absolute and relative drivers available on a given
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* system.
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*
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* For example, consider a system with two absolute drivers that provide
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* frequency settings of 100, 200 and 300, 400 and a relative driver that
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* provides settings of 50%, 100%. The cpufreq core would export frequency
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* levels of 50, 100, 150, 200, 300, 400.
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*
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* The "info only" flag signifies that settings returned by
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* CPUFREQ_DRV_SETTINGS cannot be passed to the CPUFREQ_DRV_SET method and
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* are only informational. This is for some drivers that can return
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* information about settings but rely on another machine-dependent driver
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* for actually performing the frequency transition (e.g., ACPI performance
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* states of type "functional fixed hardware.")
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*/
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#define CPUFREQ_TYPE_MASK 0xffff
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#define CPUFREQ_TYPE_RELATIVE (1<<0)
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#define CPUFREQ_TYPE_ABSOLUTE (1<<1)
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#define CPUFREQ_FLAG_INFO_ONLY (1<<16)
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/*
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* When setting a level, the caller indicates the priority of this request.
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* Priorities determine, among other things, whether a level can be
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* overridden by other callers. For example, if the user sets a level but
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* the system thermal driver needs to override it for emergency cooling,
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* the driver would use a higher priority. Once the event has passed, the
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* driver would call cpufreq to resume any previous level.
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*/
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#define CPUFREQ_PRIO_HIGHEST 1000000
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#define CPUFREQ_PRIO_KERN 1000
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#define CPUFREQ_PRIO_USER 100
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#define CPUFREQ_PRIO_LOWEST 0
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/*
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* Register and unregister a driver with the cpufreq core. Once a driver
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* is registered, it must support calls to its CPUFREQ_GET, CPUFREQ_GET_LEVEL,
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* and CPUFREQ_SET methods. It must also unregister before returning from
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* its DEVICE_DETACH method.
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*/
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int cpufreq_register(device_t dev);
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int cpufreq_unregister(device_t dev);
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/*
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* Notify the cpufreq core that the number of or values for settings have
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* changed.
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*/
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int cpufreq_settings_changed(device_t dev);
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/*
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* Eventhandlers that are called before and after a change in frequency.
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* The new level and the result of the change (0 is success) is passed in.
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* If the driver wishes to revoke the change from cpufreq_pre_change, it
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* stores a non-zero error code in the result parameter and the change will
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* not be made. If the post-change eventhandler gets a non-zero result,
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* no change was made and the previous level remains in effect. If a change
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* is revoked, the post-change eventhandler is still called with the error
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* value supplied by the revoking driver. This gives listeners who cached
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* some data in preparation for a level change a chance to clean up.
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*/
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typedef void (*cpufreq_pre_notify_fn)(void *, const struct cf_level *, int *);
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typedef void (*cpufreq_post_notify_fn)(void *, const struct cf_level *, int);
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EVENTHANDLER_DECLARE(cpufreq_pre_change, cpufreq_pre_notify_fn);
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EVENTHANDLER_DECLARE(cpufreq_post_change, cpufreq_post_notify_fn);
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/*
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* Eventhandler called when the available list of levels changed.
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* The unit number of the device (i.e. "cpufreq0") whose levels changed
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* is provided so the listener can retrieve the new list of levels.
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*/
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typedef void (*cpufreq_levels_notify_fn)(void *, int);
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EVENTHANDLER_DECLARE(cpufreq_levels_changed, cpufreq_levels_notify_fn);
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/* Allow values to be +/- a bit since sometimes we have to estimate. */
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#define CPUFREQ_CMP(x, y) (abs((x) - (y)) < 25)
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/*
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* Machine-dependent functions.
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*/
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/* Estimate the current clock rate for the given CPU id. */
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int cpu_est_clockrate(int cpu_id, uint64_t *rate);
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#endif /* !_SYS_CPU_H_ */
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