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- Remove all attempts to guess physical temperature using DiodeOffset. There are too many reports that it varies wildly depending on motherboard. Instead, if it is known to scale well and its offset is known from other temperature sensors on board, the user may set "dev.amdtemp.0.sensor_offset" tunable to compensate the difference. Document the caveats in amdtemp(4). - Add a quirk for Socket AM2 Revision G processors. These processors are known to have a different offset according to Linux k8temp driver. - Warn about Family 10h Erratum 319. These processors have broken sensors. - Report temperature in more logical orders under dev.amdtemp node. For example, "dev.amdtemp.0.sensor0.core0" is now "dev.amdtemp.0.core0.sensor0". - Replace K8, K10 and K11 with official processor names in amdtemp(4).
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3.7 KiB
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111 lines
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.\"-
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.\" Copyright (c) 2008 Rui Paulo
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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 February 23, 2012
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.Dt AMDTEMP 4
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.Os
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.Sh NAME
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.Nm amdtemp
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.Nd device driver for
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.Tn AMD
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processor on-die digital thermal sensor
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.Sh SYNOPSIS
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To compile this driver into the kernel,
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place the following line in your
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kernel configuration file:
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.Bd -ragged -offset indent
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.Cd "device amdtemp"
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.Ed
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.Pp
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Alternatively, to load the driver as a
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module at boot time, place the following line in
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.Xr loader.conf 5 :
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.Bd -literal -offset indent
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amdtemp_load="YES"
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.Ed
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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 on-die digital thermal sensor present
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in
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.Tn AMD
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Family 0Fh, 10h, 11h, 12h, 14h, and 15h processors.
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.Pp
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For Family 0Fh processors, the
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.Nm
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driver reports each core's temperature through sysctl nodes, named
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.Va dev.amdtemp.%d.core{0,1}.sensor{0,1} .
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The driver also creates
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.Va dev.cpu.%d.temperature
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in the corresponding CPU device's sysctl tree, displaying the maximum
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temperature of the two sensors located in each CPU core.
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.Pp
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For Family 10h, 11h, 12h, 14h, and 15h processors, the driver reports each
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package's temperature through a sysctl node, named
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.Va dev.amdtemp.%d.core0.sensor0 .
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The driver also creates
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.Va dev.cpu.%d.temperature
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in the corresponding CPU device's sysctl tree, displaying the temperature
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of the shared sensor located in each CPU package.
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.Sh SYSCTL VARIABLES
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The following variable is available as both
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.Xr sysctl 8
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variable and
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.Xr loader 8
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tunable:
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.Bl -tag -width indent
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.It Va dev.amdtemp.%d.sensor_offset
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.El
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Add the given offset to the temperature of the sensor. Default is 0.
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.Sh SEE ALSO
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.Xr loader 8 ,
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.Xr sysctl 8
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.Sh HISTORY
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The
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.Nm
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driver first appeared in
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.Fx 7.1 .
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.Sh AUTHORS
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.An Rui Paulo Aq rpaulo@FreeBSD.org
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.An Norikatsu Shigemura Aq nork@FreeBSD.org
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.An Jung-uk Kim Aq jkim@FreeBSD.org
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.Sh CAVEATS
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For Family 10h and later processors,
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.Do
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(the reported temperature) is a non-physical temperature measured on
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an arbitrary scale and it does not represent an actual physical
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temperature like die or case temperature. Instead, it specifies
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the processor temperature relative to the point at which the system
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must supply the maximum cooling for the processor's specified maximum
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case temperature and maximum thermal power dissipation
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.Dc
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according to
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.Rs
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.%T BIOS and Kernel Developer's Guide (BKDG) for AMD Processors
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.%U http://developer.amd.com/documentation/guides/Pages/default.aspx
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.Re
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