475a76e3ce
copyright. When all member nations of the Buenos Aires Convention adopted the Berne Convention, the phrase "All rights reserved" became unnecessary to assert copyright. Remove it from files under my or Panasas's copyright. The files related to jedec_dimm(4) also bear avg@'s copyright; he has approved this change. Approved by: avg Sponsored by: Panasas
242 lines
6.6 KiB
Groff
242 lines
6.6 KiB
Groff
.\"
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.\" SPDX-License-Identifier: BSD-2-Clause-FreeBSD
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.\"
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.\" Copyright (c) 2016 Andriy Gapon <avg@FreeBSD.org>
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.\" Copyright (c) 2018 Ravi Pokala <rpokala@freebsd.org>
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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 ``AS IS'' AND ANY EXPRESS OR
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.\" IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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.\" OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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.\" IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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.\" INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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.\" NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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.\" DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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.\" THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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.\" (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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.\" THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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.\"
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.\" $FreeBSD$
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.\"
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.Dd July 31, 2018
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.Dt JEDEC_DIMM 4
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.Os
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.Sh NAME
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.Nm jedec_dimm
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.Nd report asset information and temperatures for JEDEC DDR3 / DDR4 DIMMs
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.Sh SYNOPSIS
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.Bd -ragged -offset indent
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.Cd "device jedec_dimm"
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.Cd "device smbus"
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.Ed
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.Pp
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Alternatively, to load the driver as a module at boot time, place the following
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line in
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.Xr loader.conf 5 :
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.Bd -literal -offset indent
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jedec_dimm_load="YES"
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.Ed
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.Pp
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Addressing information must be manually specified in
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.Pa /boot/device.hints :
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.Bd -literal -offset indent
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.Cd hint.jedec_dimm.0.at="smbus0"
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.Cd hint.jedec_dimm.0.addr="0xa0"
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.Cd hint.jedec_dimm.0.slotid="Silkscreen"
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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 reports asset information (Part Number, Serial Number) encoded in the
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.Dq Serial Presence Detect
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(SPD) data on JEDEC DDR3 and DDR4 DIMMs.
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It also calculates and reports the memory capacity of the DIMM, in megabytes.
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If the DIMM includes a
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.Dq Thermal Sensor On DIMM
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(TSOD), the temperature is also reported.
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.Pp
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The
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.Nm
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driver accesses the SPD and TSOD over the
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.Xr smbus 4 .
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.Pp
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The data is reported via a
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.Xr sysctl 8
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interface; all values are read-only:
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.Bl -tag -width "dev.jedec_dimm.X.capacity"
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.It Va dev.jedec_dimm.X.%desc
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a string description of the DIMM, including TSOD and slotid info if present.
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.It Va dev.jedec_dimm.X.capacity
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the DIMM's memory capacity, in megabytes
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.It Va dev.jedec_dimm.X.part
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the manufacturer's part number of the DIMM
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.It Va dev.jedec_dimm.X.serial
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the manufacturer's serial number of the DIMM
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.It Va dev.jedec_dimm.X.slotid
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a copy of the corresponding hint, if set
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.It Va dev.jedec_dimm.X.temp
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if a TSOD is present, the reported temperature
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.It Va dev.jedec_dimm.X.type
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the DIMM type (DDR3 or DDR4)
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.El
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.Pp
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These values are configurable for
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.Nm
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via
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.Xr device.hints 5 :
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.Bl -tag -width "hint.jedec_dimm.X.slotid"
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.It Va hint.jedec_dimm.X.at
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the
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.Xr smbus 4
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to which the DIMM is connected
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.It Va hint.jedec_dimm.X.addr
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the SMBus address of the SPD.
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JEDEC specifies that the four most-significant bits of the address are the
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.Dq Device Type Identifier
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(DTI), and that the DTI of the SPD is 0xa.
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Since the least-significant bit of an SMBus address is the read/write bit, and
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is always written as 0, that means the four least-significant bits of the
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address must be even.
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.It Va hint.jedec_dimm.X.slotid
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optional slot identifier.
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If populated with the DIMM slot name silkscreened on the motherboard, this
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provides a mapping between the DIMM slot name and the DIMM serial number.
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That mapping is useful for detailed asset tracking, and makes it easier to
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physically locate a specific DIMM when doing a replacement.
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This is useful when assembling multiple identical systems, as might be done by
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a system vendor.
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The mapping between bus/address and DIMM slot must first be determined, either
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through motherboard documentation or trial-and-error.
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.El
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.Pp
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If the DIMMs are on an I2C bus behind an
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.Xr iicbus 4
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controller, then the
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.Xr iicsmb 4
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bridge driver can be used to attach the
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.Xr smbus 4 .
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.Sh EXAMPLES
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Consider two DDR4 DIMMs with the following hints:
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.Bd -literal -offset indent
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hint.jedec_dimm.0.at="smbus0"
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hint.jedec_dimm.0.addr="0xa0"
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hint.jedec_dimm.0.slotid="A1"
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hint.jedec_dimm.6.at="smbus1"
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hint.jedec_dimm.6.addr="0xa8"
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.Ed
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.Pp
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Their
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.Xr sysctl 8
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output (sorted):
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.Bd -literal -offset indent
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dev.jedec_dimm.0.%desc: DDR4 DIMM w/ Atmel TSOD (A1)
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dev.jedec_dimm.0.%driver: jedec_dimm
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dev.jedec_dimm.0.%location: addr=0xa0
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dev.jedec_dimm.0.%parent: smbus0
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dev.jedec_dimm.0.%pnpinfo:
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dev.jedec_dimm.0.capacity: 16384
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dev.jedec_dimm.0.part: 36ASF2G72PZ-2G1A2
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dev.jedec_dimm.0.serial: 0ea815de
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dev.jedec_dimm.0.slotid: A1
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dev.jedec_dimm.0.temp: 32.7C
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dev.jedec_dimm.0.type: DDR4
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dev.jedec_dimm.6.%desc: DDR4 DIMM w/ TSE2004av compliant TSOD
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dev.jedec_dimm.6.%driver: jedec_dimm
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dev.jedec_dimm.6.%location: addr=0xa8
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dev.jedec_dimm.6.%parent: smbus1
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dev.jedec_dimm.6.%pnpinfo:
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dev.jedec_dimm.6.capacity: 8192
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dev.jedec_dimm.6.part: VRA9MR8B2H1603
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dev.jedec_dimm.6.serial: 0c4c46ad
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dev.jedec_dimm.6.temp: 43.1C
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dev.jedec_dimm.6.type: DDR4
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.Ed
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.Sh COMPATIBILITY
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.Nm
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implements a superset of the functionality of the now-deleted
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.Xr jedec_ts 4 .
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Hints for
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.Xr jedec_ts 4
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can be mechanically converted for use with
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.Nm .
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Two changes are required:
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.Bl -enum
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.It
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In all
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.Xr jedec_ts 4
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hints, replace
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.Dq jedec_ts
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with
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.Dq jedec_dimm
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.It
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In
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.Xr jedec_ts 4
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.Dq addr
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hints, replace the TSOD DTI
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.Dq 0x3
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with the SPD DTI
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.Dq 0xa
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.El
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.Pp
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The following
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.Xr sed 1
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script will perform the necessary changes:
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.Bd -literal -offset indent
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sed -i ".old" -e 's/jedec_ts/jedec_dimm/' \\
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-e '/jedec_dimm/s/addr="0x3/addr="0xa/' /boot/device.hints
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.Ed
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.Sh SEE ALSO
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.Xr iicbus 4 ,
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.Xr iicsmb 4 ,
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.Xr smbus 4 ,
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.Xr sysctl 8
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.Sh STANDARDS
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.Rs
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(DDR3 SPD)
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.%A JEDEC
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.%T Standard 21-C, Annex K
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.Re
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.Pp
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.Rs
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(DDR3 TSOD)
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.%A JEDEC
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.%T Standard 21-C, TSE2002av
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.Re
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.Pp
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.Rs
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(DDR4 SPD)
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.%A JEDEC
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.%T Standard 21-C, Annex L
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.Re
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.Pp
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.Rs
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(DDR4 TSOD)
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.%A JEDEC
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.%T Standard 21-C, TSE2004av
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.Re
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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 12.0 .
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.Sh AUTHORS
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.An -nosplit
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The
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.Nm
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driver and this manual page were written by
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.An Ravi Pokala Aq Mt rpokala@freebsd.org .
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They are both based in part on the now-deleted
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.Xr jedec_ts 4
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driver and manual page, written by
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.An Andriy Gapon Aq Mt avg@FreeBSD.org .
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