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a2afe45a8a
after. Unify the paths for all Cx states. Remove cpu_idle_busy and instead do the little profiling we need before re-enabling interrupts. Use 1 quantum as estimate for C1 sleep duration since the timer interrupt is the main reason we wake. While here, change the cx_history sysctl to cx_usage and report statistics for which idle states were used in terms of percent. This seems more intuitive than counters. Remove the cx_stats structure since it's no longer used. Update the man page. Change various types which do not need explicit size.
431 lines
11 KiB
Groff
431 lines
11 KiB
Groff
.\"
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.\" Copyright (c) 2001 Michael Smith
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.\" All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.\" $FreeBSD$
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.\"
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.Dd June 4, 2004
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.Dt ACPI 4
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.Os
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.Sh NAME
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.Nm acpi
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.Nd Advanced Configuration and Power Management support
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.Sh SYNOPSIS
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.Cd "device acpi"
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.Pp
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.Cd "options ACPI_DEBUG"
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.Sh DESCRIPTION
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The
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.Nm
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driver provides support for the Intel/Microsoft/Compaq/Toshiba ACPI
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standard.
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This support includes platform hardware discovery (superseding the
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PnP and PCI BIOS), as well as power management (superseding APM) and
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other features.
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ACPI core support is provided by the ACPI CA reference implementation
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from Intel.
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.Pp
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Note that the
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.Nm
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driver is automatically loaded by the bootloader, and should not normally
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be compiled into the kernel.
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.Sh ENVIRONMENT
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This support is still experimental, and thus there are many debugging
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and tuning options which are managed via the kernel environment.
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Tunables can be set at the
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.Xr loader 8
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prompt before booting the kernel or stored in
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.Pa /boot/loader.conf .
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.Pp
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Debugging is separated between layers and levels, where a layer is
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a portion of the ACPI subsystem, and a level is a particular kind
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of debugging output.
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.Pp
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Both layers and levels are specified as a whitespace-separated list of
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tokens, with layers listed in
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.Va debug.acpi.layer
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and levels in
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.Va debug.acpi.level .
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The supported layers are:
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.Pp
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.Bl -item -offset indent -compact
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.It
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.Li ACPI_UTILITIES
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.It
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.Li ACPI_HARDWARE
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.It
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.Li ACPI_EVENTS
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.It
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.Li ACPI_TABLES
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.It
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.Li ACPI_NAMESPACE
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.It
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.Li ACPI_PARSER
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.It
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.Li ACPI_DISPATCHER
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.It
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.Li ACPI_EXECUTER
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.It
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.Li ACPI_RESOURCES
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.It
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.Li ACPI_CA_DEBUGGER
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.It
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.Li ACPI_OS_SERVICES
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.It
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.Li ACPI_CA_DISASSEMBLER
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.It
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.Li ACPI_ALL_COMPONENTS
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.It
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.Li ACPI_AC_ADAPTER
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.It
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.Li ACPI_BATTERY
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.It
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.Li ACPI_BUS
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.It
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.Li ACPI_BUTTON
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.It
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.Li ACPI_EC
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.It
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.Li ACPI_FAN
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.It
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.Li ACPI_POWER
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.It
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.Li ACPI_PROCESSOR
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.It
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.Li ACPI_THERMAL
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.It
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.Li ACPI_TIMER
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.It
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.Li ACPI_ALL_DRIVERS
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.El
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.Pp
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The supported levels are:
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.Pp
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.Bl -item -offset indent -compact
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.It
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.Li ACPI_LV_ERROR
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.It
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.Li ACPI_LV_WARN
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.It
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.Li ACPI_LV_INIT
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.It
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.Li ACPI_LV_DEBUG_OBJECT
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.It
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.Li ACPI_LV_INFO
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.It
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.Li ACPI_LV_ALL_EXCEPTIONS
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.It
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.Li ACPI_LV_INIT_NAMES
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.It
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.Li ACPI_LV_PARSE
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.It
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.Li ACPI_LV_LOAD
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.It
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.Li ACPI_LV_DISPATCH
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.It
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.Li ACPI_LV_EXEC
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.It
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.Li ACPI_LV_NAMES
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.It
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.Li ACPI_LV_OPREGION
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.It
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.Li ACPI_LV_BFIELD
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.It
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.Li ACPI_LV_TABLES
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.It
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.Li ACPI_LV_VALUES
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.It
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.Li ACPI_LV_OBJECTS
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.It
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.Li ACPI_LV_RESOURCES
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.It
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.Li ACPI_LV_USER_REQUESTS
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.It
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.Li ACPI_LV_PACKAGE
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.It
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.Li ACPI_LV_VERBOSITY1
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.It
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.Li ACPI_LV_ALLOCATIONS
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.It
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.Li ACPI_LV_FUNCTIONS
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.It
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.Li ACPI_LV_OPTIMIZATIONS
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.It
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.Li ACPI_LV_VERBOSITY2
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.It
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.Li ACPI_LV_ALL
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.It
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.Li ACPI_LV_MUTEX
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.It
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.Li ACPI_LV_THREADS
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.It
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.Li ACPI_LV_IO
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.It
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.Li ACPI_LV_INTERRUPTS
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.It
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.Li ACPI_LV_VERBOSITY3
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.It
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.Li ACPI_LV_AML_DISASSEMBLE
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.It
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.Li ACPI_LV_VERBOSE_INFO
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.It
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.Li ACPI_LV_FULL_TABLES
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.It
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.Li ACPI_LV_EVENTS
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.It
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.Li ACPI_LV_VERBOSE
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.El
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.Pp
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Selection of the appropriate layer and level values is important
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to avoid massive amounts of debugging output.
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Check the code to see which you need.
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.Pp
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Debugging output by the ACPI CA subsystem is prefixed with the
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module name in lowercase, followed by a source line number.
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Output from the
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.Fx Ns -local
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code follows the same format, but
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the module name is uppercased.
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.Pp
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To disable the
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.Nm
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driver completely, set the kernel environment variable
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.Va hint.acpi.0.disabled
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to 1.
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.Pp
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Some i386 machines totally fail to operate with some or all of ACPI disabled.
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Other i386 machines fail with ACPI enabled.
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Non-i386 platforms do not support operating systems which do not use ACPI.
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Disabling all or part of ACPI on non-i386 platforms may result in a
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non-functional system.
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.Pp
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The
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.Nm
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driver comprises a set of drivers, which may be selectively disabled
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in case of problems.
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To disable a sub-driver, list it in the kernel
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environment variable
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.Va debug.acpi.disabled .
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Multiple entries can be listed, separated by a space.
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.Pp
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ACPI sub-devices and features that can be disabled:
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.Bl -tag -width sysresource
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.It Li all
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Disable all ACPI features and devices.
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.It Li acad
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.Pq Vt device
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Supports AC adapter.
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.It Li bus
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.Pq Vt feature
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Probes and attaches subdevices.
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Disabling will avoid scanning the ACPI namespace entirely.
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.It Li children
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.Pq Vt feature
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Attaches standard ACPI sub-drivers and devices enumerated in the
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ACPI namespace.
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Disabling this has a similar effect to disabling
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.Dq Li bus ,
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except that the
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ACPI namespace will still be scanned.
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.It Li button
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.Pq Vt device
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Supports ACPI button devices (typically power and sleep buttons.)
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.It Li cmbat
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.Pq Vt device
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Control-method batteries device.
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.It Li cpu
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.Pq Vt device
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Supports CPU power-saving and speed-setting functions.
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.It Li ec
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.Pq Vt device
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Supports the ACPI Embedded Controller interface, used to communicate
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with embedded platform controllers.
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.It Li isa
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.Pq Vt device
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Supports an ISA bus bridge defined in the ACPI namespace,
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typically as a child of a PCI bus.
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.It Li lid
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.Pq Vt device
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Supports an ACPI laptop lid switch, which typically puts a
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system to sleep.
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.It Li quirks
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.Pq Vt feature
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Don't honor quirks.
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Quirks automatically disable ACPI functionality based on the XSDT table's
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OEM vendor name and revision date.
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.It Li pci
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.Pq Vt device
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Supports Host to PCI bridges.
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.It Li pci_link
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.Pq Vt feature
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Performs PCI interrupt routing.
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.It Li sysresource
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.Pq Vt device
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Pseudo-devices containing resources which ACPI claims.
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.It Li thermal
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.Pq Vt device
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Supports system cooling and heat management.
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.It Li timer
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.Pq Vt device
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Implements a timecounter using the ACPI fixed-frequency timer.
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.El
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.Pp
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It is also possible to avoid portions of the ACPI namespace which
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may be causing problems, by listing the full path of the root of
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the region to be avoided in the kernel environment variable
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.Va debug.acpi.avoid .
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The object and all of its children will be ignored during the
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bus/children scan of the namespace.
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The ACPI CA code will still
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know about the avoided region.
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.Sh OVERRIDING YOUR BIOS BYTECODE
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ACPI interprets bytecode named AML, ACPI Machine Language, provided by the BIOS
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vendor as a memory image at boot time.
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Sometimes, the AML code contains
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a problem that does not appear in the Microsoft implementation.
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So we provide a way to override it with your own AML code.
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.Pp
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In order to load your AML code,
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you must edit
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.Pa /boot/loader.conf
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and
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include the following lines.
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.Bd -literal -offset indent
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acpi_dsdt_load="YES"
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acpi_dsdt_name="/boot/acpi_dsdt.aml" #You may change the name.
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.Ed
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.Pp
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In order to prepare your AML code, you will need the
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.Xr acpidump 8
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and
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.Xr iasl 1
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utilities and some ACPI knowledge.
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.Sh TUNABLES
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.Bl -tag -width indent
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.It Va acpi_dsdt_load
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Enables loading of a custom ACPI DSDT.
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.It Va acpi_dsdt_name
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Name of the DSDT table to load, if loading is enabled.
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.It Va debug.acpi.disabled
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Selectively disables portions of ACPI for debugging purposes.
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.It Va hint.acpi.0.disabled
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Disables all of ACPI.
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.It Va hw.acpi.ec.poll_timeout
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Delay in milliseconds to wait for the EC to respond.
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Try increasing this number if you get the error
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.Er AE_NO_HARDWARE_RESPONSE .
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.It Va hw.acpi.reset_video
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Enables calling the VESA reset BIOS vector on the resume path.
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Some graphic chips have problems such as LCD white-out after resume.
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Try setting this to 0 if this causes problems for you.
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.It Va hw.acpi.osname
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Some systems' ASL may have problems because they look for names
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of Microsoft operating systems.
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This tunable overrides the value of the
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.Qq Li \e_OS
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object from its default of
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.Qq Li FreeBSD .
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.It Va hw.acpi.pci.link.%d.%d.%d.irq
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Override the interrupt to use.
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.It Va hw.acpi.verbose
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Turn on verbose debugging information about what ACPI is doing.
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.El
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.Sh SYSCTLS
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.Bl -tag -width indent
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.It Va hw.acpi.cpu.throttle_max
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Maximum value for CPU throttling, equal to 100% of the clock rate.
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.It Va hw.acpi.cpu.throttle_state
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Get or set the current throttling state, from 1 to
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.Va hw.acpi.cpu.throttle_max .
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This scales back the CPU clock rate and the corresponding power consumption.
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.It Va hw.acpi.cpu.cx_usage
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Debugging information listing the percent of total usage for each sleep state.
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The values are reset when
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.Va hw.acpi.cpu.cx_lowest
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is modified.
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.It Va hw.acpi.cpu.cx_lowest
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Lowest Cx state to use for idling the CPU.
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A scheduling algorithm will select states between C1 and this setting
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as system load dictates.
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To enable ACPI CPU idling control,
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.Va machdep.cpu_idle_hlt
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must be set to 1.
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.It Va hw.acpi.cpu.cx_supported
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List of supported CPU idle states and their transition latency
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in microseconds.
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Each state has a type (e.g., C2.)
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C1 is equivalent to the ia32 HLT instruction, C2 provides a deeper
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sleep with the same semantics, and C3 provides the deepest sleep
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but additionally requires bus mastering to be disabled.
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States greater than C3 provide even more power savings with the same
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semantics as the C3 state.
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Deeper sleeps provide more power savings but increased transition
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latency when an interrupt occurs.
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.El
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.Sh COMPATIBILITY
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ACPI is only found and supported on i386/ia32, ia64, and amd64.
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.Sh SEE ALSO
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.Xr kenv 1 ,
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.Xr acpi_thermal 4 ,
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.Xr device.hints 5 ,
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.Xr loader.conf 5 ,
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.Xr acpiconf 8 ,
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.Xr acpidump 8 ,
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.Xr config 8 ,
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.Xr iasl 8
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.Rs
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.%A "Compaq Computer Corporation"
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.%A "Intel Corporation"
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.%A "Microsoft Corporation"
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.%A "Phoenix Technologies Ltd."
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.%A "Toshiba Corporation"
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.%D August 25, 2003
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.%T "Advanced Configuration and Power Interface Specification"
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.%O http://acpi.info/spec.htm
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.Re
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.Sh AUTHORS
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.An -nosplit
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The ACPI CA subsystem is developed and maintained by
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Intel Architecture Labs.
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.Pp
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The following people made notable contributions to the ACPI subsystem
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in
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.Fx :
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.An Michael Smith ,
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.An Takanori Watanabe Aq takawata@jp.FreeBSD.org ,
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.An Mitsuru IWASAKI Aq iwasaki@jp.FreeBSD.org ,
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.An Munehiro Matsuda ,
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.An Nate Lawson ,
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the ACPI-jp mailing list at
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.Aq acpi-jp@jp.FreeBSD.org ,
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and many other contributors.
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.Pp
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This manual page was written by
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.An Michael Smith Aq msmith@FreeBSD.org .
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.Sh BUGS
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If the
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.Nm
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driver is loaded as a module when it is already linked as part of the
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kernel, odd things may happen.
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