1068 lines
29 KiB
C
1068 lines
29 KiB
C
/*-
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* Copyright (c) 2004-2007 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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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/param.h>
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#include <sys/bus.h>
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#include <sys/cpu.h>
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#include <sys/eventhandler.h>
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#include <sys/kernel.h>
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#include <sys/lock.h>
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#include <sys/malloc.h>
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#include <sys/module.h>
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#include <sys/proc.h>
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#include <sys/queue.h>
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#include <sys/sbuf.h>
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#include <sys/sched.h>
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#include <sys/smp.h>
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#include <sys/sysctl.h>
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#include <sys/systm.h>
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#include <sys/sx.h>
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#include <sys/timetc.h>
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#include <sys/taskqueue.h>
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#include "cpufreq_if.h"
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/*
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* Common CPU frequency glue code. Drivers for specific hardware can
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* attach this interface to allow users to get/set the CPU frequency.
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*/
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/*
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* Number of levels we can handle. Levels are synthesized from settings
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* so for M settings and N drivers, there may be M*N levels.
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*/
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#define CF_MAX_LEVELS 64
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struct cf_saved_freq {
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struct cf_level level;
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int priority;
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SLIST_ENTRY(cf_saved_freq) link;
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};
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struct cpufreq_softc {
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struct sx lock;
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struct cf_level curr_level;
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int curr_priority;
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SLIST_HEAD(, cf_saved_freq) saved_freq;
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struct cf_level_lst all_levels;
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int all_count;
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int max_mhz;
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device_t dev;
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struct sysctl_ctx_list sysctl_ctx;
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struct task startup_task;
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struct cf_level *levels_buf;
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};
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struct cf_setting_array {
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struct cf_setting sets[MAX_SETTINGS];
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int count;
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TAILQ_ENTRY(cf_setting_array) link;
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};
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TAILQ_HEAD(cf_setting_lst, cf_setting_array);
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#define CF_MTX_INIT(x) sx_init((x), "cpufreq lock")
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#define CF_MTX_LOCK(x) sx_xlock((x))
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#define CF_MTX_UNLOCK(x) sx_xunlock((x))
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#define CF_MTX_ASSERT(x) sx_assert((x), SX_XLOCKED)
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#define CF_DEBUG(msg...) do { \
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if (cf_verbose) \
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printf("cpufreq: " msg); \
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} while (0)
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static int cpufreq_attach(device_t dev);
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static void cpufreq_startup_task(void *ctx, int pending);
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static int cpufreq_detach(device_t dev);
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static int cf_set_method(device_t dev, const struct cf_level *level,
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int priority);
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static int cf_get_method(device_t dev, struct cf_level *level);
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static int cf_levels_method(device_t dev, struct cf_level *levels,
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int *count);
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static int cpufreq_insert_abs(struct cpufreq_softc *sc,
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struct cf_setting *sets, int count);
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static int cpufreq_expand_set(struct cpufreq_softc *sc,
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struct cf_setting_array *set_arr);
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static struct cf_level *cpufreq_dup_set(struct cpufreq_softc *sc,
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struct cf_level *dup, struct cf_setting *set);
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static int cpufreq_curr_sysctl(SYSCTL_HANDLER_ARGS);
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static int cpufreq_levels_sysctl(SYSCTL_HANDLER_ARGS);
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static int cpufreq_settings_sysctl(SYSCTL_HANDLER_ARGS);
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static device_method_t cpufreq_methods[] = {
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DEVMETHOD(device_probe, bus_generic_probe),
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DEVMETHOD(device_attach, cpufreq_attach),
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DEVMETHOD(device_detach, cpufreq_detach),
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DEVMETHOD(cpufreq_set, cf_set_method),
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DEVMETHOD(cpufreq_get, cf_get_method),
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DEVMETHOD(cpufreq_levels, cf_levels_method),
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{0, 0}
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};
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static driver_t cpufreq_driver = {
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"cpufreq", cpufreq_methods, sizeof(struct cpufreq_softc)
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};
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static devclass_t cpufreq_dc;
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DRIVER_MODULE(cpufreq, cpu, cpufreq_driver, cpufreq_dc, 0, 0);
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static int cf_lowest_freq;
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static int cf_verbose;
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static SYSCTL_NODE(_debug, OID_AUTO, cpufreq, CTLFLAG_RD, NULL,
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"cpufreq debugging");
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SYSCTL_INT(_debug_cpufreq, OID_AUTO, lowest, CTLFLAG_RWTUN, &cf_lowest_freq, 1,
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"Don't provide levels below this frequency.");
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SYSCTL_INT(_debug_cpufreq, OID_AUTO, verbose, CTLFLAG_RWTUN, &cf_verbose, 1,
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"Print verbose debugging messages");
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static int
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cpufreq_attach(device_t dev)
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{
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struct cpufreq_softc *sc;
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struct pcpu *pc;
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device_t parent;
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uint64_t rate;
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int numdevs;
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CF_DEBUG("initializing %s\n", device_get_nameunit(dev));
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sc = device_get_softc(dev);
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parent = device_get_parent(dev);
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sc->dev = dev;
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sysctl_ctx_init(&sc->sysctl_ctx);
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TAILQ_INIT(&sc->all_levels);
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CF_MTX_INIT(&sc->lock);
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sc->curr_level.total_set.freq = CPUFREQ_VAL_UNKNOWN;
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SLIST_INIT(&sc->saved_freq);
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/* Try to get nominal CPU freq to use it as maximum later if needed */
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sc->max_mhz = cpu_get_nominal_mhz(dev);
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/* If that fails, try to measure the current rate */
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if (sc->max_mhz <= 0) {
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pc = cpu_get_pcpu(dev);
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if (cpu_est_clockrate(pc->pc_cpuid, &rate) == 0)
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sc->max_mhz = rate / 1000000;
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else
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sc->max_mhz = CPUFREQ_VAL_UNKNOWN;
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}
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/*
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* Only initialize one set of sysctls for all CPUs. In the future,
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* if multiple CPUs can have different settings, we can move these
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* sysctls to be under every CPU instead of just the first one.
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*/
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numdevs = devclass_get_count(cpufreq_dc);
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if (numdevs > 1)
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return (0);
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CF_DEBUG("initializing one-time data for %s\n",
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device_get_nameunit(dev));
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sc->levels_buf = malloc(CF_MAX_LEVELS * sizeof(*sc->levels_buf),
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M_DEVBUF, M_WAITOK);
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SYSCTL_ADD_PROC(&sc->sysctl_ctx,
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SYSCTL_CHILDREN(device_get_sysctl_tree(parent)),
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OID_AUTO, "freq", CTLTYPE_INT | CTLFLAG_RW, sc, 0,
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cpufreq_curr_sysctl, "I", "Current CPU frequency");
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SYSCTL_ADD_PROC(&sc->sysctl_ctx,
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SYSCTL_CHILDREN(device_get_sysctl_tree(parent)),
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OID_AUTO, "freq_levels", CTLTYPE_STRING | CTLFLAG_RD, sc, 0,
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cpufreq_levels_sysctl, "A", "CPU frequency levels");
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/*
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* Queue a one-shot broadcast that levels have changed.
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* It will run once the system has completed booting.
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*/
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TASK_INIT(&sc->startup_task, 0, cpufreq_startup_task, dev);
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taskqueue_enqueue(taskqueue_thread, &sc->startup_task);
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return (0);
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}
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/* Handle any work to be done for all drivers that attached during boot. */
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static void
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cpufreq_startup_task(void *ctx, int pending)
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{
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cpufreq_settings_changed((device_t)ctx);
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}
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static int
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cpufreq_detach(device_t dev)
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{
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struct cpufreq_softc *sc;
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struct cf_saved_freq *saved_freq;
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int numdevs;
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CF_DEBUG("shutdown %s\n", device_get_nameunit(dev));
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sc = device_get_softc(dev);
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sysctl_ctx_free(&sc->sysctl_ctx);
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while ((saved_freq = SLIST_FIRST(&sc->saved_freq)) != NULL) {
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SLIST_REMOVE_HEAD(&sc->saved_freq, link);
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free(saved_freq, M_TEMP);
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}
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/* Only clean up these resources when the last device is detaching. */
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numdevs = devclass_get_count(cpufreq_dc);
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if (numdevs == 1) {
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CF_DEBUG("final shutdown for %s\n", device_get_nameunit(dev));
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free(sc->levels_buf, M_DEVBUF);
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}
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return (0);
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}
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static int
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cf_set_method(device_t dev, const struct cf_level *level, int priority)
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{
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struct cpufreq_softc *sc;
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const struct cf_setting *set;
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struct cf_saved_freq *saved_freq, *curr_freq;
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struct pcpu *pc;
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int error, i;
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sc = device_get_softc(dev);
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error = 0;
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set = NULL;
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saved_freq = NULL;
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/* We are going to change levels so notify the pre-change handler. */
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EVENTHANDLER_INVOKE(cpufreq_pre_change, level, &error);
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if (error != 0) {
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EVENTHANDLER_INVOKE(cpufreq_post_change, level, error);
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return (error);
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}
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CF_MTX_LOCK(&sc->lock);
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#ifdef SMP
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#ifdef EARLY_AP_STARTUP
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MPASS(mp_ncpus == 1 || smp_started);
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#else
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/*
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* If still booting and secondary CPUs not started yet, don't allow
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* changing the frequency until they're online. This is because we
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* can't switch to them using sched_bind() and thus we'd only be
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* switching the main CPU. XXXTODO: Need to think more about how to
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* handle having different CPUs at different frequencies.
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*/
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if (mp_ncpus > 1 && !smp_started) {
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device_printf(dev, "rejecting change, SMP not started yet\n");
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error = ENXIO;
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goto out;
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}
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#endif
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#endif /* SMP */
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/*
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* If the requested level has a lower priority, don't allow
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* the new level right now.
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*/
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if (priority < sc->curr_priority) {
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CF_DEBUG("ignoring, curr prio %d less than %d\n", priority,
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sc->curr_priority);
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error = EPERM;
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goto out;
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}
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/*
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* If the caller didn't specify a level and one is saved, prepare to
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* restore the saved level. If none has been saved, return an error.
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*/
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if (level == NULL) {
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saved_freq = SLIST_FIRST(&sc->saved_freq);
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if (saved_freq == NULL) {
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CF_DEBUG("NULL level, no saved level\n");
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error = ENXIO;
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goto out;
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}
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level = &saved_freq->level;
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priority = saved_freq->priority;
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CF_DEBUG("restoring saved level, freq %d prio %d\n",
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level->total_set.freq, priority);
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}
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/* Reject levels that are below our specified threshold. */
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if (level->total_set.freq < cf_lowest_freq) {
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CF_DEBUG("rejecting freq %d, less than %d limit\n",
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level->total_set.freq, cf_lowest_freq);
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error = EINVAL;
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goto out;
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}
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/* If already at this level, just return. */
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if (sc->curr_level.total_set.freq == level->total_set.freq) {
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CF_DEBUG("skipping freq %d, same as current level %d\n",
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level->total_set.freq, sc->curr_level.total_set.freq);
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goto skip;
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}
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/* First, set the absolute frequency via its driver. */
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set = &level->abs_set;
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if (set->dev) {
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if (!device_is_attached(set->dev)) {
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error = ENXIO;
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goto out;
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}
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/* Bind to the target CPU before switching. */
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pc = cpu_get_pcpu(set->dev);
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thread_lock(curthread);
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sched_bind(curthread, pc->pc_cpuid);
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thread_unlock(curthread);
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CF_DEBUG("setting abs freq %d on %s (cpu %d)\n", set->freq,
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device_get_nameunit(set->dev), PCPU_GET(cpuid));
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error = CPUFREQ_DRV_SET(set->dev, set);
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thread_lock(curthread);
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sched_unbind(curthread);
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thread_unlock(curthread);
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if (error) {
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goto out;
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}
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}
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/* Next, set any/all relative frequencies via their drivers. */
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for (i = 0; i < level->rel_count; i++) {
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set = &level->rel_set[i];
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if (!device_is_attached(set->dev)) {
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error = ENXIO;
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goto out;
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}
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/* Bind to the target CPU before switching. */
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pc = cpu_get_pcpu(set->dev);
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thread_lock(curthread);
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sched_bind(curthread, pc->pc_cpuid);
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thread_unlock(curthread);
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CF_DEBUG("setting rel freq %d on %s (cpu %d)\n", set->freq,
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device_get_nameunit(set->dev), PCPU_GET(cpuid));
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error = CPUFREQ_DRV_SET(set->dev, set);
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thread_lock(curthread);
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sched_unbind(curthread);
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thread_unlock(curthread);
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if (error) {
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/* XXX Back out any successful setting? */
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goto out;
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}
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}
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skip:
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/*
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* Before recording the current level, check if we're going to a
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* higher priority. If so, save the previous level and priority.
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*/
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if (sc->curr_level.total_set.freq != CPUFREQ_VAL_UNKNOWN &&
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priority > sc->curr_priority) {
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CF_DEBUG("saving level, freq %d prio %d\n",
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sc->curr_level.total_set.freq, sc->curr_priority);
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curr_freq = malloc(sizeof(*curr_freq), M_TEMP, M_NOWAIT);
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if (curr_freq == NULL) {
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error = ENOMEM;
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goto out;
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}
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curr_freq->level = sc->curr_level;
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curr_freq->priority = sc->curr_priority;
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SLIST_INSERT_HEAD(&sc->saved_freq, curr_freq, link);
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}
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sc->curr_level = *level;
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sc->curr_priority = priority;
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/* If we were restoring a saved state, reset it to "unused". */
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if (saved_freq != NULL) {
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CF_DEBUG("resetting saved level\n");
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sc->curr_level.total_set.freq = CPUFREQ_VAL_UNKNOWN;
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SLIST_REMOVE_HEAD(&sc->saved_freq, link);
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free(saved_freq, M_TEMP);
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}
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out:
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CF_MTX_UNLOCK(&sc->lock);
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/*
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* We changed levels (or attempted to) so notify the post-change
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* handler of new frequency or error.
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*/
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EVENTHANDLER_INVOKE(cpufreq_post_change, level, error);
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if (error && set)
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device_printf(set->dev, "set freq failed, err %d\n", error);
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return (error);
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}
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|
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static int
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cf_get_method(device_t dev, struct cf_level *level)
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{
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struct cpufreq_softc *sc;
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struct cf_level *levels;
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struct cf_setting *curr_set, set;
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struct pcpu *pc;
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device_t *devs;
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int bdiff, count, diff, error, i, n, numdevs;
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uint64_t rate;
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sc = device_get_softc(dev);
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error = 0;
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levels = NULL;
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|
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/* If we already know the current frequency, we're done. */
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CF_MTX_LOCK(&sc->lock);
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curr_set = &sc->curr_level.total_set;
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if (curr_set->freq != CPUFREQ_VAL_UNKNOWN) {
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CF_DEBUG("get returning known freq %d\n", curr_set->freq);
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goto out;
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}
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CF_MTX_UNLOCK(&sc->lock);
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|
|
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/*
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* We need to figure out the current level. Loop through every
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* driver, getting the current setting. Then, attempt to get a best
|
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* match of settings against each level.
|
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*/
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count = CF_MAX_LEVELS;
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levels = malloc(count * sizeof(*levels), M_TEMP, M_NOWAIT);
|
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if (levels == NULL)
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return (ENOMEM);
|
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error = CPUFREQ_LEVELS(sc->dev, levels, &count);
|
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if (error) {
|
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if (error == E2BIG)
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printf("cpufreq: need to increase CF_MAX_LEVELS\n");
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free(levels, M_TEMP);
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return (error);
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}
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error = device_get_children(device_get_parent(dev), &devs, &numdevs);
|
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if (error) {
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free(levels, M_TEMP);
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return (error);
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}
|
|
|
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/*
|
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* Reacquire the lock and search for the given level.
|
|
*
|
|
* XXX Note: this is not quite right since we really need to go
|
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* through each level and compare both absolute and relative
|
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* settings for each driver in the system before making a match.
|
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* The estimation code below catches this case though.
|
|
*/
|
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CF_MTX_LOCK(&sc->lock);
|
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for (n = 0; n < numdevs && curr_set->freq == CPUFREQ_VAL_UNKNOWN; n++) {
|
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if (!device_is_attached(devs[n]))
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continue;
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if (CPUFREQ_DRV_GET(devs[n], &set) != 0)
|
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continue;
|
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for (i = 0; i < count; i++) {
|
|
if (set.freq == levels[i].total_set.freq) {
|
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sc->curr_level = levels[i];
|
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break;
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}
|
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}
|
|
}
|
|
free(devs, M_TEMP);
|
|
if (curr_set->freq != CPUFREQ_VAL_UNKNOWN) {
|
|
CF_DEBUG("get matched freq %d from drivers\n", curr_set->freq);
|
|
goto out;
|
|
}
|
|
|
|
/*
|
|
* We couldn't find an exact match, so attempt to estimate and then
|
|
* match against a level.
|
|
*/
|
|
pc = cpu_get_pcpu(dev);
|
|
if (pc == NULL) {
|
|
error = ENXIO;
|
|
goto out;
|
|
}
|
|
cpu_est_clockrate(pc->pc_cpuid, &rate);
|
|
rate /= 1000000;
|
|
bdiff = 1 << 30;
|
|
for (i = 0; i < count; i++) {
|
|
diff = abs(levels[i].total_set.freq - rate);
|
|
if (diff < bdiff) {
|
|
bdiff = diff;
|
|
sc->curr_level = levels[i];
|
|
}
|
|
}
|
|
CF_DEBUG("get estimated freq %d\n", curr_set->freq);
|
|
|
|
out:
|
|
if (error == 0)
|
|
*level = sc->curr_level;
|
|
|
|
CF_MTX_UNLOCK(&sc->lock);
|
|
if (levels)
|
|
free(levels, M_TEMP);
|
|
return (error);
|
|
}
|
|
|
|
static int
|
|
cf_levels_method(device_t dev, struct cf_level *levels, int *count)
|
|
{
|
|
struct cf_setting_array *set_arr;
|
|
struct cf_setting_lst rel_sets;
|
|
struct cpufreq_softc *sc;
|
|
struct cf_level *lev;
|
|
struct cf_setting *sets;
|
|
struct pcpu *pc;
|
|
device_t *devs;
|
|
int error, i, numdevs, set_count, type;
|
|
uint64_t rate;
|
|
|
|
if (levels == NULL || count == NULL)
|
|
return (EINVAL);
|
|
|
|
TAILQ_INIT(&rel_sets);
|
|
sc = device_get_softc(dev);
|
|
error = device_get_children(device_get_parent(dev), &devs, &numdevs);
|
|
if (error)
|
|
return (error);
|
|
sets = malloc(MAX_SETTINGS * sizeof(*sets), M_TEMP, M_NOWAIT);
|
|
if (sets == NULL) {
|
|
free(devs, M_TEMP);
|
|
return (ENOMEM);
|
|
}
|
|
|
|
/* Get settings from all cpufreq drivers. */
|
|
CF_MTX_LOCK(&sc->lock);
|
|
for (i = 0; i < numdevs; i++) {
|
|
/* Skip devices that aren't ready. */
|
|
if (!device_is_attached(devs[i]))
|
|
continue;
|
|
|
|
/*
|
|
* Get settings, skipping drivers that offer no settings or
|
|
* provide settings for informational purposes only.
|
|
*/
|
|
error = CPUFREQ_DRV_TYPE(devs[i], &type);
|
|
if (error || (type & CPUFREQ_FLAG_INFO_ONLY)) {
|
|
if (error == 0) {
|
|
CF_DEBUG("skipping info-only driver %s\n",
|
|
device_get_nameunit(devs[i]));
|
|
}
|
|
continue;
|
|
}
|
|
set_count = MAX_SETTINGS;
|
|
error = CPUFREQ_DRV_SETTINGS(devs[i], sets, &set_count);
|
|
if (error || set_count == 0)
|
|
continue;
|
|
|
|
/* Add the settings to our absolute/relative lists. */
|
|
switch (type & CPUFREQ_TYPE_MASK) {
|
|
case CPUFREQ_TYPE_ABSOLUTE:
|
|
error = cpufreq_insert_abs(sc, sets, set_count);
|
|
break;
|
|
case CPUFREQ_TYPE_RELATIVE:
|
|
CF_DEBUG("adding %d relative settings\n", set_count);
|
|
set_arr = malloc(sizeof(*set_arr), M_TEMP, M_NOWAIT);
|
|
if (set_arr == NULL) {
|
|
error = ENOMEM;
|
|
goto out;
|
|
}
|
|
bcopy(sets, set_arr->sets, set_count * sizeof(*sets));
|
|
set_arr->count = set_count;
|
|
TAILQ_INSERT_TAIL(&rel_sets, set_arr, link);
|
|
break;
|
|
default:
|
|
error = EINVAL;
|
|
}
|
|
if (error)
|
|
goto out;
|
|
}
|
|
|
|
/*
|
|
* If there are no absolute levels, create a fake one at 100%. We
|
|
* then cache the clockrate for later use as our base frequency.
|
|
*/
|
|
if (TAILQ_EMPTY(&sc->all_levels)) {
|
|
if (sc->max_mhz == CPUFREQ_VAL_UNKNOWN) {
|
|
sc->max_mhz = cpu_get_nominal_mhz(dev);
|
|
/*
|
|
* If the CPU can't report a rate for 100%, hope
|
|
* the CPU is running at its nominal rate right now,
|
|
* and use that instead.
|
|
*/
|
|
if (sc->max_mhz <= 0) {
|
|
pc = cpu_get_pcpu(dev);
|
|
cpu_est_clockrate(pc->pc_cpuid, &rate);
|
|
sc->max_mhz = rate / 1000000;
|
|
}
|
|
}
|
|
memset(&sets[0], CPUFREQ_VAL_UNKNOWN, sizeof(*sets));
|
|
sets[0].freq = sc->max_mhz;
|
|
sets[0].dev = NULL;
|
|
error = cpufreq_insert_abs(sc, sets, 1);
|
|
if (error)
|
|
goto out;
|
|
}
|
|
|
|
/* Create a combined list of absolute + relative levels. */
|
|
TAILQ_FOREACH(set_arr, &rel_sets, link)
|
|
cpufreq_expand_set(sc, set_arr);
|
|
|
|
/* If the caller doesn't have enough space, return the actual count. */
|
|
if (sc->all_count > *count) {
|
|
*count = sc->all_count;
|
|
error = E2BIG;
|
|
goto out;
|
|
}
|
|
|
|
/* Finally, output the list of levels. */
|
|
i = 0;
|
|
TAILQ_FOREACH(lev, &sc->all_levels, link) {
|
|
|
|
/* Skip levels that have a frequency that is too low. */
|
|
if (lev->total_set.freq < cf_lowest_freq) {
|
|
sc->all_count--;
|
|
continue;
|
|
}
|
|
|
|
levels[i] = *lev;
|
|
i++;
|
|
}
|
|
*count = sc->all_count;
|
|
error = 0;
|
|
|
|
out:
|
|
/* Clear all levels since we regenerate them each time. */
|
|
while ((lev = TAILQ_FIRST(&sc->all_levels)) != NULL) {
|
|
TAILQ_REMOVE(&sc->all_levels, lev, link);
|
|
free(lev, M_TEMP);
|
|
}
|
|
sc->all_count = 0;
|
|
|
|
CF_MTX_UNLOCK(&sc->lock);
|
|
while ((set_arr = TAILQ_FIRST(&rel_sets)) != NULL) {
|
|
TAILQ_REMOVE(&rel_sets, set_arr, link);
|
|
free(set_arr, M_TEMP);
|
|
}
|
|
free(devs, M_TEMP);
|
|
free(sets, M_TEMP);
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* Create levels for an array of absolute settings and insert them in
|
|
* sorted order in the specified list.
|
|
*/
|
|
static int
|
|
cpufreq_insert_abs(struct cpufreq_softc *sc, struct cf_setting *sets,
|
|
int count)
|
|
{
|
|
struct cf_level_lst *list;
|
|
struct cf_level *level, *search;
|
|
int i;
|
|
|
|
CF_MTX_ASSERT(&sc->lock);
|
|
|
|
list = &sc->all_levels;
|
|
for (i = 0; i < count; i++) {
|
|
level = malloc(sizeof(*level), M_TEMP, M_NOWAIT | M_ZERO);
|
|
if (level == NULL)
|
|
return (ENOMEM);
|
|
level->abs_set = sets[i];
|
|
level->total_set = sets[i];
|
|
level->total_set.dev = NULL;
|
|
sc->all_count++;
|
|
|
|
if (TAILQ_EMPTY(list)) {
|
|
CF_DEBUG("adding abs setting %d at head\n",
|
|
sets[i].freq);
|
|
TAILQ_INSERT_HEAD(list, level, link);
|
|
continue;
|
|
}
|
|
|
|
TAILQ_FOREACH_REVERSE(search, list, cf_level_lst, link) {
|
|
if (sets[i].freq <= search->total_set.freq) {
|
|
CF_DEBUG("adding abs setting %d after %d\n",
|
|
sets[i].freq, search->total_set.freq);
|
|
TAILQ_INSERT_AFTER(list, search, level, link);
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Expand a group of relative settings, creating derived levels from them.
|
|
*/
|
|
static int
|
|
cpufreq_expand_set(struct cpufreq_softc *sc, struct cf_setting_array *set_arr)
|
|
{
|
|
struct cf_level *fill, *search;
|
|
struct cf_setting *set;
|
|
int i;
|
|
|
|
CF_MTX_ASSERT(&sc->lock);
|
|
|
|
/*
|
|
* Walk the set of all existing levels in reverse. This is so we
|
|
* create derived states from the lowest absolute settings first
|
|
* and discard duplicates created from higher absolute settings.
|
|
* For instance, a level of 50 Mhz derived from 100 Mhz + 50% is
|
|
* preferable to 200 Mhz + 25% because absolute settings are more
|
|
* efficient since they often change the voltage as well.
|
|
*/
|
|
TAILQ_FOREACH_REVERSE(search, &sc->all_levels, cf_level_lst, link) {
|
|
/* Add each setting to the level, duplicating if necessary. */
|
|
for (i = 0; i < set_arr->count; i++) {
|
|
set = &set_arr->sets[i];
|
|
|
|
/*
|
|
* If this setting is less than 100%, split the level
|
|
* into two and add this setting to the new level.
|
|
*/
|
|
fill = search;
|
|
if (set->freq < 10000) {
|
|
fill = cpufreq_dup_set(sc, search, set);
|
|
|
|
/*
|
|
* The new level was a duplicate of an existing
|
|
* level or its absolute setting is too high
|
|
* so we freed it. For example, we discard a
|
|
* derived level of 1000 MHz/25% if a level
|
|
* of 500 MHz/100% already exists.
|
|
*/
|
|
if (fill == NULL)
|
|
break;
|
|
}
|
|
|
|
/* Add this setting to the existing or new level. */
|
|
KASSERT(fill->rel_count < MAX_SETTINGS,
|
|
("cpufreq: too many relative drivers (%d)",
|
|
MAX_SETTINGS));
|
|
fill->rel_set[fill->rel_count] = *set;
|
|
fill->rel_count++;
|
|
CF_DEBUG(
|
|
"expand set added rel setting %d%% to %d level\n",
|
|
set->freq / 100, fill->total_set.freq);
|
|
}
|
|
}
|
|
|
|
return (0);
|
|
}
|
|
|
|
static struct cf_level *
|
|
cpufreq_dup_set(struct cpufreq_softc *sc, struct cf_level *dup,
|
|
struct cf_setting *set)
|
|
{
|
|
struct cf_level_lst *list;
|
|
struct cf_level *fill, *itr;
|
|
struct cf_setting *fill_set, *itr_set;
|
|
int i;
|
|
|
|
CF_MTX_ASSERT(&sc->lock);
|
|
|
|
/*
|
|
* Create a new level, copy it from the old one, and update the
|
|
* total frequency and power by the percentage specified in the
|
|
* relative setting.
|
|
*/
|
|
fill = malloc(sizeof(*fill), M_TEMP, M_NOWAIT);
|
|
if (fill == NULL)
|
|
return (NULL);
|
|
*fill = *dup;
|
|
fill_set = &fill->total_set;
|
|
fill_set->freq =
|
|
((uint64_t)fill_set->freq * set->freq) / 10000;
|
|
if (fill_set->power != CPUFREQ_VAL_UNKNOWN) {
|
|
fill_set->power = ((uint64_t)fill_set->power * set->freq)
|
|
/ 10000;
|
|
}
|
|
if (set->lat != CPUFREQ_VAL_UNKNOWN) {
|
|
if (fill_set->lat != CPUFREQ_VAL_UNKNOWN)
|
|
fill_set->lat += set->lat;
|
|
else
|
|
fill_set->lat = set->lat;
|
|
}
|
|
CF_DEBUG("dup set considering derived setting %d\n", fill_set->freq);
|
|
|
|
/*
|
|
* If we copied an old level that we already modified (say, at 100%),
|
|
* we need to remove that setting before adding this one. Since we
|
|
* process each setting array in order, we know any settings for this
|
|
* driver will be found at the end.
|
|
*/
|
|
for (i = fill->rel_count; i != 0; i--) {
|
|
if (fill->rel_set[i - 1].dev != set->dev)
|
|
break;
|
|
CF_DEBUG("removed last relative driver: %s\n",
|
|
device_get_nameunit(set->dev));
|
|
fill->rel_count--;
|
|
}
|
|
|
|
/*
|
|
* Insert the new level in sorted order. If it is a duplicate of an
|
|
* existing level (1) or has an absolute setting higher than the
|
|
* existing level (2), do not add it. We can do this since any such
|
|
* level is guaranteed use less power. For example (1), a level with
|
|
* one absolute setting of 800 Mhz uses less power than one composed
|
|
* of an absolute setting of 1600 Mhz and a relative setting at 50%.
|
|
* Also for example (2), a level of 800 Mhz/75% is preferable to
|
|
* 1600 Mhz/25% even though the latter has a lower total frequency.
|
|
*/
|
|
list = &sc->all_levels;
|
|
KASSERT(!TAILQ_EMPTY(list), ("all levels list empty in dup set"));
|
|
TAILQ_FOREACH_REVERSE(itr, list, cf_level_lst, link) {
|
|
itr_set = &itr->total_set;
|
|
if (CPUFREQ_CMP(fill_set->freq, itr_set->freq)) {
|
|
CF_DEBUG("dup set rejecting %d (dupe)\n",
|
|
fill_set->freq);
|
|
itr = NULL;
|
|
break;
|
|
} else if (fill_set->freq < itr_set->freq) {
|
|
if (fill->abs_set.freq <= itr->abs_set.freq) {
|
|
CF_DEBUG(
|
|
"dup done, inserting new level %d after %d\n",
|
|
fill_set->freq, itr_set->freq);
|
|
TAILQ_INSERT_AFTER(list, itr, fill, link);
|
|
sc->all_count++;
|
|
} else {
|
|
CF_DEBUG("dup set rejecting %d (abs too big)\n",
|
|
fill_set->freq);
|
|
itr = NULL;
|
|
}
|
|
break;
|
|
}
|
|
}
|
|
|
|
/* We didn't find a good place for this new level so free it. */
|
|
if (itr == NULL) {
|
|
CF_DEBUG("dup set freeing new level %d (not optimal)\n",
|
|
fill_set->freq);
|
|
free(fill, M_TEMP);
|
|
fill = NULL;
|
|
}
|
|
|
|
return (fill);
|
|
}
|
|
|
|
static int
|
|
cpufreq_curr_sysctl(SYSCTL_HANDLER_ARGS)
|
|
{
|
|
struct cpufreq_softc *sc;
|
|
struct cf_level *levels;
|
|
int best, count, diff, bdiff, devcount, error, freq, i, n;
|
|
device_t *devs;
|
|
|
|
devs = NULL;
|
|
sc = oidp->oid_arg1;
|
|
levels = sc->levels_buf;
|
|
|
|
error = CPUFREQ_GET(sc->dev, &levels[0]);
|
|
if (error)
|
|
goto out;
|
|
freq = levels[0].total_set.freq;
|
|
error = sysctl_handle_int(oidp, &freq, 0, req);
|
|
if (error != 0 || req->newptr == NULL)
|
|
goto out;
|
|
|
|
/*
|
|
* While we only call cpufreq_get() on one device (assuming all
|
|
* CPUs have equal levels), we call cpufreq_set() on all CPUs.
|
|
* This is needed for some MP systems.
|
|
*/
|
|
error = devclass_get_devices(cpufreq_dc, &devs, &devcount);
|
|
if (error)
|
|
goto out;
|
|
for (n = 0; n < devcount; n++) {
|
|
count = CF_MAX_LEVELS;
|
|
error = CPUFREQ_LEVELS(devs[n], levels, &count);
|
|
if (error) {
|
|
if (error == E2BIG)
|
|
printf(
|
|
"cpufreq: need to increase CF_MAX_LEVELS\n");
|
|
break;
|
|
}
|
|
best = 0;
|
|
bdiff = 1 << 30;
|
|
for (i = 0; i < count; i++) {
|
|
diff = abs(levels[i].total_set.freq - freq);
|
|
if (diff < bdiff) {
|
|
bdiff = diff;
|
|
best = i;
|
|
}
|
|
}
|
|
error = CPUFREQ_SET(devs[n], &levels[best], CPUFREQ_PRIO_USER);
|
|
}
|
|
|
|
out:
|
|
if (devs)
|
|
free(devs, M_TEMP);
|
|
return (error);
|
|
}
|
|
|
|
static int
|
|
cpufreq_levels_sysctl(SYSCTL_HANDLER_ARGS)
|
|
{
|
|
struct cpufreq_softc *sc;
|
|
struct cf_level *levels;
|
|
struct cf_setting *set;
|
|
struct sbuf sb;
|
|
int count, error, i;
|
|
|
|
sc = oidp->oid_arg1;
|
|
sbuf_new(&sb, NULL, 128, SBUF_AUTOEXTEND);
|
|
|
|
/* Get settings from the device and generate the output string. */
|
|
count = CF_MAX_LEVELS;
|
|
levels = sc->levels_buf;
|
|
if (levels == NULL) {
|
|
sbuf_delete(&sb);
|
|
return (ENOMEM);
|
|
}
|
|
error = CPUFREQ_LEVELS(sc->dev, levels, &count);
|
|
if (error) {
|
|
if (error == E2BIG)
|
|
printf("cpufreq: need to increase CF_MAX_LEVELS\n");
|
|
goto out;
|
|
}
|
|
if (count) {
|
|
for (i = 0; i < count; i++) {
|
|
set = &levels[i].total_set;
|
|
sbuf_printf(&sb, "%d/%d ", set->freq, set->power);
|
|
}
|
|
} else
|
|
sbuf_cpy(&sb, "0");
|
|
sbuf_trim(&sb);
|
|
sbuf_finish(&sb);
|
|
error = sysctl_handle_string(oidp, sbuf_data(&sb), sbuf_len(&sb), req);
|
|
|
|
out:
|
|
sbuf_delete(&sb);
|
|
return (error);
|
|
}
|
|
|
|
static int
|
|
cpufreq_settings_sysctl(SYSCTL_HANDLER_ARGS)
|
|
{
|
|
device_t dev;
|
|
struct cf_setting *sets;
|
|
struct sbuf sb;
|
|
int error, i, set_count;
|
|
|
|
dev = oidp->oid_arg1;
|
|
sbuf_new(&sb, NULL, 128, SBUF_AUTOEXTEND);
|
|
|
|
/* Get settings from the device and generate the output string. */
|
|
set_count = MAX_SETTINGS;
|
|
sets = malloc(set_count * sizeof(*sets), M_TEMP, M_NOWAIT);
|
|
if (sets == NULL) {
|
|
sbuf_delete(&sb);
|
|
return (ENOMEM);
|
|
}
|
|
error = CPUFREQ_DRV_SETTINGS(dev, sets, &set_count);
|
|
if (error)
|
|
goto out;
|
|
if (set_count) {
|
|
for (i = 0; i < set_count; i++)
|
|
sbuf_printf(&sb, "%d/%d ", sets[i].freq, sets[i].power);
|
|
} else
|
|
sbuf_cpy(&sb, "0");
|
|
sbuf_trim(&sb);
|
|
sbuf_finish(&sb);
|
|
error = sysctl_handle_string(oidp, sbuf_data(&sb), sbuf_len(&sb), req);
|
|
|
|
out:
|
|
free(sets, M_TEMP);
|
|
sbuf_delete(&sb);
|
|
return (error);
|
|
}
|
|
|
|
int
|
|
cpufreq_register(device_t dev)
|
|
{
|
|
struct cpufreq_softc *sc;
|
|
device_t cf_dev, cpu_dev;
|
|
|
|
/* Add a sysctl to get each driver's settings separately. */
|
|
SYSCTL_ADD_PROC(device_get_sysctl_ctx(dev),
|
|
SYSCTL_CHILDREN(device_get_sysctl_tree(dev)),
|
|
OID_AUTO, "freq_settings", CTLTYPE_STRING | CTLFLAG_RD, dev, 0,
|
|
cpufreq_settings_sysctl, "A", "CPU frequency driver settings");
|
|
|
|
/*
|
|
* Add only one cpufreq device to each CPU. Currently, all CPUs
|
|
* must offer the same levels and be switched at the same time.
|
|
*/
|
|
cpu_dev = device_get_parent(dev);
|
|
if ((cf_dev = device_find_child(cpu_dev, "cpufreq", -1))) {
|
|
sc = device_get_softc(cf_dev);
|
|
sc->max_mhz = CPUFREQ_VAL_UNKNOWN;
|
|
return (0);
|
|
}
|
|
|
|
/* Add the child device and possibly sysctls. */
|
|
cf_dev = BUS_ADD_CHILD(cpu_dev, 0, "cpufreq", -1);
|
|
if (cf_dev == NULL)
|
|
return (ENOMEM);
|
|
device_quiet(cf_dev);
|
|
|
|
return (device_probe_and_attach(cf_dev));
|
|
}
|
|
|
|
int
|
|
cpufreq_unregister(device_t dev)
|
|
{
|
|
device_t cf_dev, *devs;
|
|
int cfcount, devcount, error, i, type;
|
|
|
|
/*
|
|
* If this is the last cpufreq child device, remove the control
|
|
* device as well. We identify cpufreq children by calling a method
|
|
* they support.
|
|
*/
|
|
error = device_get_children(device_get_parent(dev), &devs, &devcount);
|
|
if (error)
|
|
return (error);
|
|
cf_dev = device_find_child(device_get_parent(dev), "cpufreq", -1);
|
|
if (cf_dev == NULL) {
|
|
device_printf(dev,
|
|
"warning: cpufreq_unregister called with no cpufreq device active\n");
|
|
free(devs, M_TEMP);
|
|
return (0);
|
|
}
|
|
cfcount = 0;
|
|
for (i = 0; i < devcount; i++) {
|
|
if (!device_is_attached(devs[i]))
|
|
continue;
|
|
if (CPUFREQ_DRV_TYPE(devs[i], &type) == 0)
|
|
cfcount++;
|
|
}
|
|
if (cfcount <= 1)
|
|
device_delete_child(device_get_parent(cf_dev), cf_dev);
|
|
free(devs, M_TEMP);
|
|
|
|
return (0);
|
|
}
|
|
|
|
int
|
|
cpufreq_settings_changed(device_t dev)
|
|
{
|
|
|
|
EVENTHANDLER_INVOKE(cpufreq_levels_changed,
|
|
device_get_unit(device_get_parent(dev)));
|
|
return (0);
|
|
}
|