![Linus Torvalds](/assets/img/avatar_default.png)
* 'timers-timekeeping-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip:
um: Fix read_persistent_clock fallout
kgdb: Do not access xtime directly
powerpc: Clean up obsolete code relating to decrementer and timebase
powerpc: Rework VDSO gettimeofday to prevent time going backwards
clocksource: Add __clocksource_updatefreq_hz/khz methods
x86: Convert common clocksources to use clocksource_register_hz/khz
timekeeping: Make xtime and wall_to_monotonic static
hrtimer: Cleanup direct access to wall_to_monotonic
um: Convert to use read_persistent_clock
timkeeping: Fix update_vsyscall to provide wall_to_monotonic offset
powerpc: Cleanup xtime usage
powerpc: Simplify update_vsyscall
time: Kill off CONFIG_GENERIC_TIME
time: Implement timespec_add
x86: Fix vtime/file timestamp inconsistencies
Trivial conflicts in Documentation/feature-removal-schedule.txt
Much less trivial conflicts in arch/powerpc/kernel/time.c resolved as
per Thomas' earlier merge commit 47916be4e2
("Merge branch
'powerpc.cherry-picks' into timers/clocksource")
1255 lines
31 KiB
C
1255 lines
31 KiB
C
/*
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* processor_idle - idle state submodule to 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, 2005 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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* Copyright (C) 2005 Venkatesh Pallipadi <venkatesh.pallipadi@intel.com>
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* - Added support for C3 on SMP
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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 <linux/slab.h>
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#include <linux/proc_fs.h>
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#include <linux/seq_file.h>
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#include <linux/acpi.h>
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#include <linux/dmi.h>
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#include <linux/moduleparam.h>
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#include <linux/sched.h> /* need_resched() */
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#include <linux/pm_qos_params.h>
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#include <linux/clockchips.h>
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#include <linux/cpuidle.h>
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#include <linux/irqflags.h>
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/*
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* Include the apic definitions for x86 to have the APIC timer related defines
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* available also for UP (on SMP it gets magically included via linux/smp.h).
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* asm/acpi.h is not an option, as it would require more include magic. Also
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* creating an empty asm-ia64/apic.h would just trade pest vs. cholera.
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*/
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#ifdef CONFIG_X86
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#include <asm/apic.h>
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#endif
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#include <asm/io.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 <asm/processor.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_idle");
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#define ACPI_PROCESSOR_FILE_POWER "power"
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#define PM_TIMER_TICK_NS (1000000000ULL/PM_TIMER_FREQUENCY)
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#define C2_OVERHEAD 1 /* 1us */
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#define C3_OVERHEAD 1 /* 1us */
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#define PM_TIMER_TICKS_TO_US(p) (((p) * 1000)/(PM_TIMER_FREQUENCY/1000))
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static unsigned int max_cstate __read_mostly = ACPI_PROCESSOR_MAX_POWER;
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module_param(max_cstate, uint, 0000);
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static unsigned int nocst __read_mostly;
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module_param(nocst, uint, 0000);
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static int bm_check_disable __read_mostly;
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module_param(bm_check_disable, uint, 0000);
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static unsigned int latency_factor __read_mostly = 2;
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module_param(latency_factor, uint, 0644);
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#ifdef CONFIG_ACPI_PROCFS
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static u64 us_to_pm_timer_ticks(s64 t)
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{
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return div64_u64(t * PM_TIMER_FREQUENCY, 1000000);
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}
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#endif
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/*
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* IBM ThinkPad R40e crashes mysteriously when going into C2 or C3.
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* For now disable this. Probably a bug somewhere else.
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*
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* To skip this limit, boot/load with a large max_cstate limit.
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*/
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static int set_max_cstate(const struct dmi_system_id *id)
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{
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if (max_cstate > ACPI_PROCESSOR_MAX_POWER)
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return 0;
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printk(KERN_NOTICE PREFIX "%s detected - limiting to C%ld max_cstate."
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" Override with \"processor.max_cstate=%d\"\n", id->ident,
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(long)id->driver_data, ACPI_PROCESSOR_MAX_POWER + 1);
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max_cstate = (long)id->driver_data;
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return 0;
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}
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/* Actually this shouldn't be __cpuinitdata, would be better to fix the
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callers to only run once -AK */
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static struct dmi_system_id __cpuinitdata processor_power_dmi_table[] = {
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{ set_max_cstate, "Clevo 5600D", {
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DMI_MATCH(DMI_BIOS_VENDOR,"Phoenix Technologies LTD"),
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DMI_MATCH(DMI_BIOS_VERSION,"SHE845M0.86C.0013.D.0302131307")},
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(void *)2},
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{ set_max_cstate, "Pavilion zv5000", {
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DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
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DMI_MATCH(DMI_PRODUCT_NAME,"Pavilion zv5000 (DS502A#ABA)")},
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(void *)1},
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{ set_max_cstate, "Asus L8400B", {
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DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK Computer Inc."),
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DMI_MATCH(DMI_PRODUCT_NAME,"L8400B series Notebook PC")},
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(void *)1},
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{},
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};
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/*
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* Callers should disable interrupts before the call and enable
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* interrupts after return.
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*/
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static void acpi_safe_halt(void)
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{
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current_thread_info()->status &= ~TS_POLLING;
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/*
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* TS_POLLING-cleared state must be visible before we
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* test NEED_RESCHED:
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*/
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smp_mb();
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if (!need_resched()) {
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safe_halt();
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local_irq_disable();
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}
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current_thread_info()->status |= TS_POLLING;
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}
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#ifdef ARCH_APICTIMER_STOPS_ON_C3
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/*
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* Some BIOS implementations switch to C3 in the published C2 state.
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* This seems to be a common problem on AMD boxen, but other vendors
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* are affected too. We pick the most conservative approach: we assume
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* that the local APIC stops in both C2 and C3.
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*/
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static void lapic_timer_check_state(int state, struct acpi_processor *pr,
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struct acpi_processor_cx *cx)
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{
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struct acpi_processor_power *pwr = &pr->power;
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u8 type = local_apic_timer_c2_ok ? ACPI_STATE_C3 : ACPI_STATE_C2;
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if (cpu_has(&cpu_data(pr->id), X86_FEATURE_ARAT))
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return;
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if (c1e_detected)
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type = ACPI_STATE_C1;
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/*
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* Check, if one of the previous states already marked the lapic
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* unstable
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*/
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if (pwr->timer_broadcast_on_state < state)
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return;
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if (cx->type >= type)
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pr->power.timer_broadcast_on_state = state;
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}
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static void __lapic_timer_propagate_broadcast(void *arg)
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{
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struct acpi_processor *pr = (struct acpi_processor *) arg;
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unsigned long reason;
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reason = pr->power.timer_broadcast_on_state < INT_MAX ?
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CLOCK_EVT_NOTIFY_BROADCAST_ON : CLOCK_EVT_NOTIFY_BROADCAST_OFF;
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clockevents_notify(reason, &pr->id);
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}
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static void lapic_timer_propagate_broadcast(struct acpi_processor *pr)
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{
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smp_call_function_single(pr->id, __lapic_timer_propagate_broadcast,
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(void *)pr, 1);
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}
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/* Power(C) State timer broadcast control */
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static void lapic_timer_state_broadcast(struct acpi_processor *pr,
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struct acpi_processor_cx *cx,
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int broadcast)
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{
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int state = cx - pr->power.states;
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if (state >= pr->power.timer_broadcast_on_state) {
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unsigned long reason;
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reason = broadcast ? CLOCK_EVT_NOTIFY_BROADCAST_ENTER :
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CLOCK_EVT_NOTIFY_BROADCAST_EXIT;
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clockevents_notify(reason, &pr->id);
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}
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}
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#else
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static void lapic_timer_check_state(int state, struct acpi_processor *pr,
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struct acpi_processor_cx *cstate) { }
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static void lapic_timer_propagate_broadcast(struct acpi_processor *pr) { }
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static void lapic_timer_state_broadcast(struct acpi_processor *pr,
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struct acpi_processor_cx *cx,
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int broadcast)
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{
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}
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#endif
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/*
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* Suspend / resume control
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*/
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static int acpi_idle_suspend;
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static u32 saved_bm_rld;
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static void acpi_idle_bm_rld_save(void)
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{
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acpi_read_bit_register(ACPI_BITREG_BUS_MASTER_RLD, &saved_bm_rld);
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}
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static void acpi_idle_bm_rld_restore(void)
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{
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u32 resumed_bm_rld;
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acpi_read_bit_register(ACPI_BITREG_BUS_MASTER_RLD, &resumed_bm_rld);
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if (resumed_bm_rld != saved_bm_rld)
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acpi_write_bit_register(ACPI_BITREG_BUS_MASTER_RLD, saved_bm_rld);
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}
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int acpi_processor_suspend(struct acpi_device * device, pm_message_t state)
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{
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if (acpi_idle_suspend == 1)
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return 0;
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acpi_idle_bm_rld_save();
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acpi_idle_suspend = 1;
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return 0;
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}
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int acpi_processor_resume(struct acpi_device * device)
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{
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if (acpi_idle_suspend == 0)
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return 0;
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acpi_idle_bm_rld_restore();
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acpi_idle_suspend = 0;
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return 0;
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}
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#if defined(CONFIG_X86)
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static void tsc_check_state(int state)
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{
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switch (boot_cpu_data.x86_vendor) {
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case X86_VENDOR_AMD:
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case X86_VENDOR_INTEL:
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/*
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* AMD Fam10h TSC will tick in all
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* C/P/S0/S1 states when this bit is set.
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*/
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if (boot_cpu_has(X86_FEATURE_NONSTOP_TSC))
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return;
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/*FALL THROUGH*/
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default:
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/* TSC could halt in idle, so notify users */
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if (state > ACPI_STATE_C1)
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mark_tsc_unstable("TSC halts in idle");
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}
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}
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#else
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static void tsc_check_state(int state) { return; }
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#endif
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static int acpi_processor_get_power_info_fadt(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->pblk)
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return -ENODEV;
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/* if info is obtained from pblk/fadt, type equals state */
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pr->power.states[ACPI_STATE_C2].type = ACPI_STATE_C2;
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pr->power.states[ACPI_STATE_C3].type = ACPI_STATE_C3;
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#ifndef CONFIG_HOTPLUG_CPU
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/*
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* Check for P_LVL2_UP flag before entering C2 and above on
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* an SMP system.
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*/
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if ((num_online_cpus() > 1) &&
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!(acpi_gbl_FADT.flags & ACPI_FADT_C2_MP_SUPPORTED))
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return -ENODEV;
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#endif
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/* determine C2 and C3 address from pblk */
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pr->power.states[ACPI_STATE_C2].address = pr->pblk + 4;
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pr->power.states[ACPI_STATE_C3].address = pr->pblk + 5;
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/* determine latencies from FADT */
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pr->power.states[ACPI_STATE_C2].latency = acpi_gbl_FADT.C2latency;
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pr->power.states[ACPI_STATE_C3].latency = acpi_gbl_FADT.C3latency;
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/*
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* FADT specified C2 latency must be less than or equal to
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* 100 microseconds.
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*/
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if (acpi_gbl_FADT.C2latency > ACPI_PROCESSOR_MAX_C2_LATENCY) {
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ACPI_DEBUG_PRINT((ACPI_DB_INFO,
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"C2 latency too large [%d]\n", acpi_gbl_FADT.C2latency));
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/* invalidate C2 */
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pr->power.states[ACPI_STATE_C2].address = 0;
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}
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/*
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* FADT supplied C3 latency must be less than or equal to
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* 1000 microseconds.
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*/
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if (acpi_gbl_FADT.C3latency > ACPI_PROCESSOR_MAX_C3_LATENCY) {
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ACPI_DEBUG_PRINT((ACPI_DB_INFO,
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"C3 latency too large [%d]\n", acpi_gbl_FADT.C3latency));
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/* invalidate C3 */
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pr->power.states[ACPI_STATE_C3].address = 0;
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}
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ACPI_DEBUG_PRINT((ACPI_DB_INFO,
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"lvl2[0x%08x] lvl3[0x%08x]\n",
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pr->power.states[ACPI_STATE_C2].address,
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pr->power.states[ACPI_STATE_C3].address));
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return 0;
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}
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static int acpi_processor_get_power_info_default(struct acpi_processor *pr)
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{
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if (!pr->power.states[ACPI_STATE_C1].valid) {
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/* set the first C-State to C1 */
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/* all processors need to support C1 */
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pr->power.states[ACPI_STATE_C1].type = ACPI_STATE_C1;
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pr->power.states[ACPI_STATE_C1].valid = 1;
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pr->power.states[ACPI_STATE_C1].entry_method = ACPI_CSTATE_HALT;
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}
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/* the C0 state only exists as a filler in our array */
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pr->power.states[ACPI_STATE_C0].valid = 1;
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return 0;
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}
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static int acpi_processor_get_power_info_cst(struct acpi_processor *pr)
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{
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acpi_status status = 0;
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u64 count;
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int current_count;
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int i;
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struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
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union acpi_object *cst;
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if (nocst)
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return -ENODEV;
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current_count = 0;
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status = acpi_evaluate_object(pr->handle, "_CST", NULL, &buffer);
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if (ACPI_FAILURE(status)) {
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ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No _CST, giving up\n"));
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return -ENODEV;
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}
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cst = buffer.pointer;
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/* There must be at least 2 elements */
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if (!cst || (cst->type != ACPI_TYPE_PACKAGE) || cst->package.count < 2) {
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printk(KERN_ERR PREFIX "not enough elements in _CST\n");
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status = -EFAULT;
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goto end;
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}
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count = cst->package.elements[0].integer.value;
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/* Validate number of power states. */
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if (count < 1 || count != cst->package.count - 1) {
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printk(KERN_ERR PREFIX "count given by _CST is not valid\n");
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status = -EFAULT;
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goto end;
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}
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/* Tell driver that at least _CST is supported. */
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pr->flags.has_cst = 1;
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for (i = 1; i <= count; i++) {
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union acpi_object *element;
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union acpi_object *obj;
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struct acpi_power_register *reg;
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struct acpi_processor_cx cx;
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memset(&cx, 0, sizeof(cx));
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element = &(cst->package.elements[i]);
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if (element->type != ACPI_TYPE_PACKAGE)
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continue;
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if (element->package.count != 4)
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continue;
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obj = &(element->package.elements[0]);
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if (obj->type != ACPI_TYPE_BUFFER)
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continue;
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|
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reg = (struct acpi_power_register *)obj->buffer.pointer;
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|
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if (reg->space_id != ACPI_ADR_SPACE_SYSTEM_IO &&
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(reg->space_id != ACPI_ADR_SPACE_FIXED_HARDWARE))
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continue;
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|
|
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/* There should be an easy way to extract an integer... */
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obj = &(element->package.elements[1]);
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if (obj->type != ACPI_TYPE_INTEGER)
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continue;
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|
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cx.type = obj->integer.value;
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/*
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* Some buggy BIOSes won't list C1 in _CST -
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* Let acpi_processor_get_power_info_default() handle them later
|
|
*/
|
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if (i == 1 && cx.type != ACPI_STATE_C1)
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current_count++;
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|
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cx.address = reg->address;
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cx.index = current_count + 1;
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|
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cx.entry_method = ACPI_CSTATE_SYSTEMIO;
|
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if (reg->space_id == ACPI_ADR_SPACE_FIXED_HARDWARE) {
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if (acpi_processor_ffh_cstate_probe
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(pr->id, &cx, reg) == 0) {
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cx.entry_method = ACPI_CSTATE_FFH;
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} else if (cx.type == ACPI_STATE_C1) {
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/*
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* C1 is a special case where FIXED_HARDWARE
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* can be handled in non-MWAIT way as well.
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* In that case, save this _CST entry info.
|
|
* Otherwise, ignore this info and continue.
|
|
*/
|
|
cx.entry_method = ACPI_CSTATE_HALT;
|
|
snprintf(cx.desc, ACPI_CX_DESC_LEN, "ACPI HLT");
|
|
} else {
|
|
continue;
|
|
}
|
|
if (cx.type == ACPI_STATE_C1 &&
|
|
(idle_halt || idle_nomwait)) {
|
|
/*
|
|
* In most cases the C1 space_id obtained from
|
|
* _CST object is FIXED_HARDWARE access mode.
|
|
* But when the option of idle=halt is added,
|
|
* the entry_method type should be changed from
|
|
* CSTATE_FFH to CSTATE_HALT.
|
|
* When the option of idle=nomwait is added,
|
|
* the C1 entry_method type should be
|
|
* CSTATE_HALT.
|
|
*/
|
|
cx.entry_method = ACPI_CSTATE_HALT;
|
|
snprintf(cx.desc, ACPI_CX_DESC_LEN, "ACPI HLT");
|
|
}
|
|
} else {
|
|
snprintf(cx.desc, ACPI_CX_DESC_LEN, "ACPI IOPORT 0x%x",
|
|
cx.address);
|
|
}
|
|
|
|
if (cx.type == ACPI_STATE_C1) {
|
|
cx.valid = 1;
|
|
}
|
|
|
|
obj = &(element->package.elements[2]);
|
|
if (obj->type != ACPI_TYPE_INTEGER)
|
|
continue;
|
|
|
|
cx.latency = obj->integer.value;
|
|
|
|
obj = &(element->package.elements[3]);
|
|
if (obj->type != ACPI_TYPE_INTEGER)
|
|
continue;
|
|
|
|
cx.power = obj->integer.value;
|
|
|
|
current_count++;
|
|
memcpy(&(pr->power.states[current_count]), &cx, sizeof(cx));
|
|
|
|
/*
|
|
* We support total ACPI_PROCESSOR_MAX_POWER - 1
|
|
* (From 1 through ACPI_PROCESSOR_MAX_POWER - 1)
|
|
*/
|
|
if (current_count >= (ACPI_PROCESSOR_MAX_POWER - 1)) {
|
|
printk(KERN_WARNING
|
|
"Limiting number of power states to max (%d)\n",
|
|
ACPI_PROCESSOR_MAX_POWER);
|
|
printk(KERN_WARNING
|
|
"Please increase ACPI_PROCESSOR_MAX_POWER if needed.\n");
|
|
break;
|
|
}
|
|
}
|
|
|
|
ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found %d power states\n",
|
|
current_count));
|
|
|
|
/* Validate number of power states discovered */
|
|
if (current_count < 2)
|
|
status = -EFAULT;
|
|
|
|
end:
|
|
kfree(buffer.pointer);
|
|
|
|
return status;
|
|
}
|
|
|
|
static void acpi_processor_power_verify_c3(struct acpi_processor *pr,
|
|
struct acpi_processor_cx *cx)
|
|
{
|
|
static int bm_check_flag = -1;
|
|
static int bm_control_flag = -1;
|
|
|
|
|
|
if (!cx->address)
|
|
return;
|
|
|
|
/*
|
|
* PIIX4 Erratum #18: We don't support C3 when Type-F (fast)
|
|
* DMA transfers are used by any ISA device to avoid livelock.
|
|
* Note that we could disable Type-F DMA (as recommended by
|
|
* the erratum), but this is known to disrupt certain ISA
|
|
* devices thus we take the conservative approach.
|
|
*/
|
|
else if (errata.piix4.fdma) {
|
|
ACPI_DEBUG_PRINT((ACPI_DB_INFO,
|
|
"C3 not supported on PIIX4 with Type-F DMA\n"));
|
|
return;
|
|
}
|
|
|
|
/* All the logic here assumes flags.bm_check is same across all CPUs */
|
|
if (bm_check_flag == -1) {
|
|
/* Determine whether bm_check is needed based on CPU */
|
|
acpi_processor_power_init_bm_check(&(pr->flags), pr->id);
|
|
bm_check_flag = pr->flags.bm_check;
|
|
bm_control_flag = pr->flags.bm_control;
|
|
} else {
|
|
pr->flags.bm_check = bm_check_flag;
|
|
pr->flags.bm_control = bm_control_flag;
|
|
}
|
|
|
|
if (pr->flags.bm_check) {
|
|
if (!pr->flags.bm_control) {
|
|
if (pr->flags.has_cst != 1) {
|
|
/* bus mastering control is necessary */
|
|
ACPI_DEBUG_PRINT((ACPI_DB_INFO,
|
|
"C3 support requires BM control\n"));
|
|
return;
|
|
} else {
|
|
/* Here we enter C3 without bus mastering */
|
|
ACPI_DEBUG_PRINT((ACPI_DB_INFO,
|
|
"C3 support without BM control\n"));
|
|
}
|
|
}
|
|
} else {
|
|
/*
|
|
* WBINVD should be set in fadt, for C3 state to be
|
|
* supported on when bm_check is not required.
|
|
*/
|
|
if (!(acpi_gbl_FADT.flags & ACPI_FADT_WBINVD)) {
|
|
ACPI_DEBUG_PRINT((ACPI_DB_INFO,
|
|
"Cache invalidation should work properly"
|
|
" for C3 to be enabled on SMP systems\n"));
|
|
return;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Otherwise we've met all of our C3 requirements.
|
|
* Normalize the C3 latency to expidite policy. Enable
|
|
* checking of bus mastering status (bm_check) so we can
|
|
* use this in our C3 policy
|
|
*/
|
|
cx->valid = 1;
|
|
|
|
cx->latency_ticks = cx->latency;
|
|
/*
|
|
* On older chipsets, BM_RLD needs to be set
|
|
* in order for Bus Master activity to wake the
|
|
* system from C3. Newer chipsets handle DMA
|
|
* during C3 automatically and BM_RLD is a NOP.
|
|
* In either case, the proper way to
|
|
* handle BM_RLD is to set it and leave it set.
|
|
*/
|
|
acpi_write_bit_register(ACPI_BITREG_BUS_MASTER_RLD, 1);
|
|
|
|
return;
|
|
}
|
|
|
|
static int acpi_processor_power_verify(struct acpi_processor *pr)
|
|
{
|
|
unsigned int i;
|
|
unsigned int working = 0;
|
|
|
|
pr->power.timer_broadcast_on_state = INT_MAX;
|
|
|
|
for (i = 1; i < ACPI_PROCESSOR_MAX_POWER && i <= max_cstate; i++) {
|
|
struct acpi_processor_cx *cx = &pr->power.states[i];
|
|
|
|
switch (cx->type) {
|
|
case ACPI_STATE_C1:
|
|
cx->valid = 1;
|
|
break;
|
|
|
|
case ACPI_STATE_C2:
|
|
if (!cx->address)
|
|
break;
|
|
cx->valid = 1;
|
|
cx->latency_ticks = cx->latency; /* Normalize latency */
|
|
break;
|
|
|
|
case ACPI_STATE_C3:
|
|
acpi_processor_power_verify_c3(pr, cx);
|
|
break;
|
|
}
|
|
if (!cx->valid)
|
|
continue;
|
|
|
|
lapic_timer_check_state(i, pr, cx);
|
|
tsc_check_state(cx->type);
|
|
working++;
|
|
}
|
|
|
|
lapic_timer_propagate_broadcast(pr);
|
|
|
|
return (working);
|
|
}
|
|
|
|
static int acpi_processor_get_power_info(struct acpi_processor *pr)
|
|
{
|
|
unsigned int i;
|
|
int result;
|
|
|
|
|
|
/* NOTE: the idle thread may not be running while calling
|
|
* this function */
|
|
|
|
/* Zero initialize all the C-states info. */
|
|
memset(pr->power.states, 0, sizeof(pr->power.states));
|
|
|
|
result = acpi_processor_get_power_info_cst(pr);
|
|
if (result == -ENODEV)
|
|
result = acpi_processor_get_power_info_fadt(pr);
|
|
|
|
if (result)
|
|
return result;
|
|
|
|
acpi_processor_get_power_info_default(pr);
|
|
|
|
pr->power.count = acpi_processor_power_verify(pr);
|
|
|
|
/*
|
|
* if one state of type C2 or C3 is available, mark this
|
|
* CPU as being "idle manageable"
|
|
*/
|
|
for (i = 1; i < ACPI_PROCESSOR_MAX_POWER; i++) {
|
|
if (pr->power.states[i].valid) {
|
|
pr->power.count = i;
|
|
if (pr->power.states[i].type >= ACPI_STATE_C2)
|
|
pr->flags.power = 1;
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
#ifdef CONFIG_ACPI_PROCFS
|
|
static int acpi_processor_power_seq_show(struct seq_file *seq, void *offset)
|
|
{
|
|
struct acpi_processor *pr = seq->private;
|
|
unsigned int i;
|
|
|
|
|
|
if (!pr)
|
|
goto end;
|
|
|
|
seq_printf(seq, "active state: C%zd\n"
|
|
"max_cstate: C%d\n"
|
|
"maximum allowed latency: %d usec\n",
|
|
pr->power.state ? pr->power.state - pr->power.states : 0,
|
|
max_cstate, pm_qos_request(PM_QOS_CPU_DMA_LATENCY));
|
|
|
|
seq_puts(seq, "states:\n");
|
|
|
|
for (i = 1; i <= pr->power.count; i++) {
|
|
seq_printf(seq, " %cC%d: ",
|
|
(&pr->power.states[i] ==
|
|
pr->power.state ? '*' : ' '), i);
|
|
|
|
if (!pr->power.states[i].valid) {
|
|
seq_puts(seq, "<not supported>\n");
|
|
continue;
|
|
}
|
|
|
|
switch (pr->power.states[i].type) {
|
|
case ACPI_STATE_C1:
|
|
seq_printf(seq, "type[C1] ");
|
|
break;
|
|
case ACPI_STATE_C2:
|
|
seq_printf(seq, "type[C2] ");
|
|
break;
|
|
case ACPI_STATE_C3:
|
|
seq_printf(seq, "type[C3] ");
|
|
break;
|
|
default:
|
|
seq_printf(seq, "type[--] ");
|
|
break;
|
|
}
|
|
|
|
seq_puts(seq, "promotion[--] ");
|
|
|
|
seq_puts(seq, "demotion[--] ");
|
|
|
|
seq_printf(seq, "latency[%03d] usage[%08d] duration[%020Lu]\n",
|
|
pr->power.states[i].latency,
|
|
pr->power.states[i].usage,
|
|
us_to_pm_timer_ticks(pr->power.states[i].time));
|
|
}
|
|
|
|
end:
|
|
return 0;
|
|
}
|
|
|
|
static int acpi_processor_power_open_fs(struct inode *inode, struct file *file)
|
|
{
|
|
return single_open(file, acpi_processor_power_seq_show,
|
|
PDE(inode)->data);
|
|
}
|
|
|
|
static const struct file_operations acpi_processor_power_fops = {
|
|
.owner = THIS_MODULE,
|
|
.open = acpi_processor_power_open_fs,
|
|
.read = seq_read,
|
|
.llseek = seq_lseek,
|
|
.release = single_release,
|
|
};
|
|
#endif
|
|
|
|
/**
|
|
* acpi_idle_bm_check - checks if bus master activity was detected
|
|
*/
|
|
static int acpi_idle_bm_check(void)
|
|
{
|
|
u32 bm_status = 0;
|
|
|
|
if (bm_check_disable)
|
|
return 0;
|
|
|
|
acpi_read_bit_register(ACPI_BITREG_BUS_MASTER_STATUS, &bm_status);
|
|
if (bm_status)
|
|
acpi_write_bit_register(ACPI_BITREG_BUS_MASTER_STATUS, 1);
|
|
/*
|
|
* PIIX4 Erratum #18: Note that BM_STS doesn't always reflect
|
|
* the true state of bus mastering activity; forcing us to
|
|
* manually check the BMIDEA bit of each IDE channel.
|
|
*/
|
|
else if (errata.piix4.bmisx) {
|
|
if ((inb_p(errata.piix4.bmisx + 0x02) & 0x01)
|
|
|| (inb_p(errata.piix4.bmisx + 0x0A) & 0x01))
|
|
bm_status = 1;
|
|
}
|
|
return bm_status;
|
|
}
|
|
|
|
/**
|
|
* acpi_idle_do_entry - a helper function that does C2 and C3 type entry
|
|
* @cx: cstate data
|
|
*
|
|
* Caller disables interrupt before call and enables interrupt after return.
|
|
*/
|
|
static inline void acpi_idle_do_entry(struct acpi_processor_cx *cx)
|
|
{
|
|
/* Don't trace irqs off for idle */
|
|
stop_critical_timings();
|
|
if (cx->entry_method == ACPI_CSTATE_FFH) {
|
|
/* Call into architectural FFH based C-state */
|
|
acpi_processor_ffh_cstate_enter(cx);
|
|
} else if (cx->entry_method == ACPI_CSTATE_HALT) {
|
|
acpi_safe_halt();
|
|
} else {
|
|
int unused;
|
|
/* IO port based C-state */
|
|
inb(cx->address);
|
|
/* Dummy wait op - must do something useless after P_LVL2 read
|
|
because chipsets cannot guarantee that STPCLK# signal
|
|
gets asserted in time to freeze execution properly. */
|
|
unused = inl(acpi_gbl_FADT.xpm_timer_block.address);
|
|
}
|
|
start_critical_timings();
|
|
}
|
|
|
|
/**
|
|
* acpi_idle_enter_c1 - enters an ACPI C1 state-type
|
|
* @dev: the target CPU
|
|
* @state: the state data
|
|
*
|
|
* This is equivalent to the HALT instruction.
|
|
*/
|
|
static int acpi_idle_enter_c1(struct cpuidle_device *dev,
|
|
struct cpuidle_state *state)
|
|
{
|
|
ktime_t kt1, kt2;
|
|
s64 idle_time;
|
|
struct acpi_processor *pr;
|
|
struct acpi_processor_cx *cx = cpuidle_get_statedata(state);
|
|
|
|
pr = __get_cpu_var(processors);
|
|
|
|
if (unlikely(!pr))
|
|
return 0;
|
|
|
|
local_irq_disable();
|
|
|
|
/* Do not access any ACPI IO ports in suspend path */
|
|
if (acpi_idle_suspend) {
|
|
local_irq_enable();
|
|
cpu_relax();
|
|
return 0;
|
|
}
|
|
|
|
lapic_timer_state_broadcast(pr, cx, 1);
|
|
kt1 = ktime_get_real();
|
|
acpi_idle_do_entry(cx);
|
|
kt2 = ktime_get_real();
|
|
idle_time = ktime_to_us(ktime_sub(kt2, kt1));
|
|
|
|
local_irq_enable();
|
|
cx->usage++;
|
|
lapic_timer_state_broadcast(pr, cx, 0);
|
|
|
|
return idle_time;
|
|
}
|
|
|
|
/**
|
|
* acpi_idle_enter_simple - enters an ACPI state without BM handling
|
|
* @dev: the target CPU
|
|
* @state: the state data
|
|
*/
|
|
static int acpi_idle_enter_simple(struct cpuidle_device *dev,
|
|
struct cpuidle_state *state)
|
|
{
|
|
struct acpi_processor *pr;
|
|
struct acpi_processor_cx *cx = cpuidle_get_statedata(state);
|
|
ktime_t kt1, kt2;
|
|
s64 idle_time_ns;
|
|
s64 idle_time;
|
|
|
|
pr = __get_cpu_var(processors);
|
|
|
|
if (unlikely(!pr))
|
|
return 0;
|
|
|
|
if (acpi_idle_suspend)
|
|
return(acpi_idle_enter_c1(dev, state));
|
|
|
|
local_irq_disable();
|
|
|
|
if (cx->entry_method != ACPI_CSTATE_FFH) {
|
|
current_thread_info()->status &= ~TS_POLLING;
|
|
/*
|
|
* TS_POLLING-cleared state must be visible before we test
|
|
* NEED_RESCHED:
|
|
*/
|
|
smp_mb();
|
|
|
|
if (unlikely(need_resched())) {
|
|
current_thread_info()->status |= TS_POLLING;
|
|
local_irq_enable();
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Must be done before busmaster disable as we might need to
|
|
* access HPET !
|
|
*/
|
|
lapic_timer_state_broadcast(pr, cx, 1);
|
|
|
|
if (cx->type == ACPI_STATE_C3)
|
|
ACPI_FLUSH_CPU_CACHE();
|
|
|
|
kt1 = ktime_get_real();
|
|
/* Tell the scheduler that we are going deep-idle: */
|
|
sched_clock_idle_sleep_event();
|
|
acpi_idle_do_entry(cx);
|
|
kt2 = ktime_get_real();
|
|
idle_time_ns = ktime_to_ns(ktime_sub(kt2, kt1));
|
|
idle_time = idle_time_ns;
|
|
do_div(idle_time, NSEC_PER_USEC);
|
|
|
|
/* Tell the scheduler how much we idled: */
|
|
sched_clock_idle_wakeup_event(idle_time_ns);
|
|
|
|
local_irq_enable();
|
|
if (cx->entry_method != ACPI_CSTATE_FFH)
|
|
current_thread_info()->status |= TS_POLLING;
|
|
|
|
cx->usage++;
|
|
|
|
lapic_timer_state_broadcast(pr, cx, 0);
|
|
cx->time += idle_time;
|
|
return idle_time;
|
|
}
|
|
|
|
static int c3_cpu_count;
|
|
static DEFINE_SPINLOCK(c3_lock);
|
|
|
|
/**
|
|
* acpi_idle_enter_bm - enters C3 with proper BM handling
|
|
* @dev: the target CPU
|
|
* @state: the state data
|
|
*
|
|
* If BM is detected, the deepest non-C3 idle state is entered instead.
|
|
*/
|
|
static int acpi_idle_enter_bm(struct cpuidle_device *dev,
|
|
struct cpuidle_state *state)
|
|
{
|
|
struct acpi_processor *pr;
|
|
struct acpi_processor_cx *cx = cpuidle_get_statedata(state);
|
|
ktime_t kt1, kt2;
|
|
s64 idle_time_ns;
|
|
s64 idle_time;
|
|
|
|
|
|
pr = __get_cpu_var(processors);
|
|
|
|
if (unlikely(!pr))
|
|
return 0;
|
|
|
|
if (acpi_idle_suspend)
|
|
return(acpi_idle_enter_c1(dev, state));
|
|
|
|
if (!cx->bm_sts_skip && acpi_idle_bm_check()) {
|
|
if (dev->safe_state) {
|
|
dev->last_state = dev->safe_state;
|
|
return dev->safe_state->enter(dev, dev->safe_state);
|
|
} else {
|
|
local_irq_disable();
|
|
acpi_safe_halt();
|
|
local_irq_enable();
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
local_irq_disable();
|
|
|
|
if (cx->entry_method != ACPI_CSTATE_FFH) {
|
|
current_thread_info()->status &= ~TS_POLLING;
|
|
/*
|
|
* TS_POLLING-cleared state must be visible before we test
|
|
* NEED_RESCHED:
|
|
*/
|
|
smp_mb();
|
|
|
|
if (unlikely(need_resched())) {
|
|
current_thread_info()->status |= TS_POLLING;
|
|
local_irq_enable();
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
acpi_unlazy_tlb(smp_processor_id());
|
|
|
|
/* Tell the scheduler that we are going deep-idle: */
|
|
sched_clock_idle_sleep_event();
|
|
/*
|
|
* Must be done before busmaster disable as we might need to
|
|
* access HPET !
|
|
*/
|
|
lapic_timer_state_broadcast(pr, cx, 1);
|
|
|
|
kt1 = ktime_get_real();
|
|
/*
|
|
* disable bus master
|
|
* bm_check implies we need ARB_DIS
|
|
* !bm_check implies we need cache flush
|
|
* bm_control implies whether we can do ARB_DIS
|
|
*
|
|
* That leaves a case where bm_check is set and bm_control is
|
|
* not set. In that case we cannot do much, we enter C3
|
|
* without doing anything.
|
|
*/
|
|
if (pr->flags.bm_check && pr->flags.bm_control) {
|
|
spin_lock(&c3_lock);
|
|
c3_cpu_count++;
|
|
/* Disable bus master arbitration when all CPUs are in C3 */
|
|
if (c3_cpu_count == num_online_cpus())
|
|
acpi_write_bit_register(ACPI_BITREG_ARB_DISABLE, 1);
|
|
spin_unlock(&c3_lock);
|
|
} else if (!pr->flags.bm_check) {
|
|
ACPI_FLUSH_CPU_CACHE();
|
|
}
|
|
|
|
acpi_idle_do_entry(cx);
|
|
|
|
/* Re-enable bus master arbitration */
|
|
if (pr->flags.bm_check && pr->flags.bm_control) {
|
|
spin_lock(&c3_lock);
|
|
acpi_write_bit_register(ACPI_BITREG_ARB_DISABLE, 0);
|
|
c3_cpu_count--;
|
|
spin_unlock(&c3_lock);
|
|
}
|
|
kt2 = ktime_get_real();
|
|
idle_time_ns = ktime_to_ns(ktime_sub(kt2, kt1));
|
|
idle_time = idle_time_ns;
|
|
do_div(idle_time, NSEC_PER_USEC);
|
|
|
|
/* Tell the scheduler how much we idled: */
|
|
sched_clock_idle_wakeup_event(idle_time_ns);
|
|
|
|
local_irq_enable();
|
|
if (cx->entry_method != ACPI_CSTATE_FFH)
|
|
current_thread_info()->status |= TS_POLLING;
|
|
|
|
cx->usage++;
|
|
|
|
lapic_timer_state_broadcast(pr, cx, 0);
|
|
cx->time += idle_time;
|
|
return idle_time;
|
|
}
|
|
|
|
struct cpuidle_driver acpi_idle_driver = {
|
|
.name = "acpi_idle",
|
|
.owner = THIS_MODULE,
|
|
};
|
|
|
|
/**
|
|
* acpi_processor_setup_cpuidle - prepares and configures CPUIDLE
|
|
* @pr: the ACPI processor
|
|
*/
|
|
static int acpi_processor_setup_cpuidle(struct acpi_processor *pr)
|
|
{
|
|
int i, count = CPUIDLE_DRIVER_STATE_START;
|
|
struct acpi_processor_cx *cx;
|
|
struct cpuidle_state *state;
|
|
struct cpuidle_device *dev = &pr->power.dev;
|
|
|
|
if (!pr->flags.power_setup_done)
|
|
return -EINVAL;
|
|
|
|
if (pr->flags.power == 0) {
|
|
return -EINVAL;
|
|
}
|
|
|
|
dev->cpu = pr->id;
|
|
for (i = 0; i < CPUIDLE_STATE_MAX; i++) {
|
|
dev->states[i].name[0] = '\0';
|
|
dev->states[i].desc[0] = '\0';
|
|
}
|
|
|
|
if (max_cstate == 0)
|
|
max_cstate = 1;
|
|
|
|
for (i = 1; i < ACPI_PROCESSOR_MAX_POWER && i <= max_cstate; i++) {
|
|
cx = &pr->power.states[i];
|
|
state = &dev->states[count];
|
|
|
|
if (!cx->valid)
|
|
continue;
|
|
|
|
#ifdef CONFIG_HOTPLUG_CPU
|
|
if ((cx->type != ACPI_STATE_C1) && (num_online_cpus() > 1) &&
|
|
!pr->flags.has_cst &&
|
|
!(acpi_gbl_FADT.flags & ACPI_FADT_C2_MP_SUPPORTED))
|
|
continue;
|
|
#endif
|
|
cpuidle_set_statedata(state, cx);
|
|
|
|
snprintf(state->name, CPUIDLE_NAME_LEN, "C%d", i);
|
|
strncpy(state->desc, cx->desc, CPUIDLE_DESC_LEN);
|
|
state->exit_latency = cx->latency;
|
|
state->target_residency = cx->latency * latency_factor;
|
|
state->power_usage = cx->power;
|
|
|
|
state->flags = 0;
|
|
switch (cx->type) {
|
|
case ACPI_STATE_C1:
|
|
state->flags |= CPUIDLE_FLAG_SHALLOW;
|
|
if (cx->entry_method == ACPI_CSTATE_FFH)
|
|
state->flags |= CPUIDLE_FLAG_TIME_VALID;
|
|
|
|
state->enter = acpi_idle_enter_c1;
|
|
dev->safe_state = state;
|
|
break;
|
|
|
|
case ACPI_STATE_C2:
|
|
state->flags |= CPUIDLE_FLAG_BALANCED;
|
|
state->flags |= CPUIDLE_FLAG_TIME_VALID;
|
|
state->enter = acpi_idle_enter_simple;
|
|
dev->safe_state = state;
|
|
break;
|
|
|
|
case ACPI_STATE_C3:
|
|
state->flags |= CPUIDLE_FLAG_DEEP;
|
|
state->flags |= CPUIDLE_FLAG_TIME_VALID;
|
|
state->flags |= CPUIDLE_FLAG_CHECK_BM;
|
|
state->enter = pr->flags.bm_check ?
|
|
acpi_idle_enter_bm :
|
|
acpi_idle_enter_simple;
|
|
break;
|
|
}
|
|
|
|
count++;
|
|
if (count == CPUIDLE_STATE_MAX)
|
|
break;
|
|
}
|
|
|
|
dev->state_count = count;
|
|
|
|
if (!count)
|
|
return -EINVAL;
|
|
|
|
return 0;
|
|
}
|
|
|
|
int acpi_processor_cst_has_changed(struct acpi_processor *pr)
|
|
{
|
|
int ret = 0;
|
|
|
|
if (boot_option_idle_override)
|
|
return 0;
|
|
|
|
if (!pr)
|
|
return -EINVAL;
|
|
|
|
if (nocst) {
|
|
return -ENODEV;
|
|
}
|
|
|
|
if (!pr->flags.power_setup_done)
|
|
return -ENODEV;
|
|
|
|
cpuidle_pause_and_lock();
|
|
cpuidle_disable_device(&pr->power.dev);
|
|
acpi_processor_get_power_info(pr);
|
|
if (pr->flags.power) {
|
|
acpi_processor_setup_cpuidle(pr);
|
|
ret = cpuidle_enable_device(&pr->power.dev);
|
|
}
|
|
cpuidle_resume_and_unlock();
|
|
|
|
return ret;
|
|
}
|
|
|
|
int __cpuinit acpi_processor_power_init(struct acpi_processor *pr,
|
|
struct acpi_device *device)
|
|
{
|
|
acpi_status status = 0;
|
|
static int first_run;
|
|
#ifdef CONFIG_ACPI_PROCFS
|
|
struct proc_dir_entry *entry = NULL;
|
|
#endif
|
|
|
|
if (boot_option_idle_override)
|
|
return 0;
|
|
|
|
if (!first_run) {
|
|
if (idle_halt) {
|
|
/*
|
|
* When the boot option of "idle=halt" is added, halt
|
|
* is used for CPU IDLE.
|
|
* In such case C2/C3 is meaningless. So the max_cstate
|
|
* is set to one.
|
|
*/
|
|
max_cstate = 1;
|
|
}
|
|
dmi_check_system(processor_power_dmi_table);
|
|
max_cstate = acpi_processor_cstate_check(max_cstate);
|
|
if (max_cstate < ACPI_C_STATES_MAX)
|
|
printk(KERN_NOTICE
|
|
"ACPI: processor limited to max C-state %d\n",
|
|
max_cstate);
|
|
first_run++;
|
|
}
|
|
|
|
if (!pr)
|
|
return -EINVAL;
|
|
|
|
if (acpi_gbl_FADT.cst_control && !nocst) {
|
|
status =
|
|
acpi_os_write_port(acpi_gbl_FADT.smi_command, acpi_gbl_FADT.cst_control, 8);
|
|
if (ACPI_FAILURE(status)) {
|
|
ACPI_EXCEPTION((AE_INFO, status,
|
|
"Notifying BIOS of _CST ability failed"));
|
|
}
|
|
}
|
|
|
|
acpi_processor_get_power_info(pr);
|
|
pr->flags.power_setup_done = 1;
|
|
|
|
/*
|
|
* Install the idle handler if processor power management is supported.
|
|
* Note that we use previously set idle handler will be used on
|
|
* platforms that only support C1.
|
|
*/
|
|
if (pr->flags.power) {
|
|
acpi_processor_setup_cpuidle(pr);
|
|
if (cpuidle_register_device(&pr->power.dev))
|
|
return -EIO;
|
|
}
|
|
#ifdef CONFIG_ACPI_PROCFS
|
|
/* 'power' [R] */
|
|
entry = proc_create_data(ACPI_PROCESSOR_FILE_POWER,
|
|
S_IRUGO, acpi_device_dir(device),
|
|
&acpi_processor_power_fops,
|
|
acpi_driver_data(device));
|
|
if (!entry)
|
|
return -EIO;
|
|
#endif
|
|
return 0;
|
|
}
|
|
|
|
int acpi_processor_power_exit(struct acpi_processor *pr,
|
|
struct acpi_device *device)
|
|
{
|
|
if (boot_option_idle_override)
|
|
return 0;
|
|
|
|
cpuidle_unregister_device(&pr->power.dev);
|
|
pr->flags.power_setup_done = 0;
|
|
|
|
#ifdef CONFIG_ACPI_PROCFS
|
|
if (acpi_device_dir(device))
|
|
remove_proc_entry(ACPI_PROCESSOR_FILE_POWER,
|
|
acpi_device_dir(device));
|
|
#endif
|
|
|
|
return 0;
|
|
}
|