svn commit: r351458 - head/share/man/man4
Konstantin Belousov
kib at FreeBSD.org
Sat Aug 24 15:38:08 UTC 2019
Author: kib
Date: Sat Aug 24 15:38:07 2019
New Revision: 351458
URL: https://svnweb.freebsd.org/changeset/base/351458
Log:
Add nvdimm(4) man page.
Reviewed by: emaste
Discussed with: scottl, scottph
Sponsored by: The FreeBSD Foundation
MFC after: 3 days
Differential revision: https://reviews.freebsd.org/D21386
Added:
head/share/man/man4/nvdimm.4 (contents, props changed)
Modified:
head/share/man/man4/Makefile
Modified: head/share/man/man4/Makefile
==============================================================================
--- head/share/man/man4/Makefile Sat Aug 24 15:31:31 2019 (r351457)
+++ head/share/man/man4/Makefile Sat Aug 24 15:38:07 2019 (r351458)
@@ -379,6 +379,7 @@ MAN= aac.4 \
null.4 \
numa.4 \
${_nvd.4} \
+ ${_nvdimm.4} \
${_nvme.4} \
${_nvram.4} \
${_nvram2env.4} \
@@ -825,6 +826,7 @@ _xnb.4= xnb.4
.if ${MACHINE_CPUARCH} == "amd64"
_ioat.4= ioat.4
+_nvdimm.4= nvdimm.4
_qlxge.4= qlxge.4
_qlxgb.4= qlxgb.4
_qlxgbe.4= qlxgbe.4
Added: head/share/man/man4/nvdimm.4
==============================================================================
--- /dev/null 00:00:00 1970 (empty, because file is newly added)
+++ head/share/man/man4/nvdimm.4 Sat Aug 24 15:38:07 2019 (r351458)
@@ -0,0 +1,122 @@
+.\" Copyright (c) 2019 The FreeBSD Foundation, Inc.
+.\"
+.\" This documentation was written by
+.\" Konstantin Belousov <kib at FreeBSD.org> under sponsorship
+.\" from the FreeBSD Foundation.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\" notice, this list of conditions and the following disclaimer.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\" notice, this list of conditions and the following disclaimer in the
+.\" documentation and/or other materials provided with the distribution.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND
+.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE
+.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+.\" SUCH DAMAGE.
+.\"
+.\" $FreeBSD$
+.\"
+.Dd August 23, 2019
+.Dt NVDIMM 4
+.Os
+.Sh NAME
+.Nm nvdimm
+.Nd ACPI NVDIMM driver
+.Sh SYNOPSIS
+To load the driver as a module at boot, place the following line in
+.Xr loader.conf 5 :
+.Bd -literal -offset indent
+nvdimm_load="YES"
+.Ed
+.Sh DESCRIPTION
+.Bf -symbolic
+Note:
+The
+.Nm
+driver is under development and has some important limitations
+described below.
+.Ef
+.Pp
+The
+.Nm
+driver provides access to Non-Volatile DIMM (NVDIMM) persistent memory
+devices, which are ACPI-enumerated under the root NVDIMM device
+with a
+.Va _HID
+of
+.Dv ACPI0012
+and in the
+.Dv NFIT
+table.
+.Pp
+For each System Physical Address (SPA) Range described by NFIT, a
+device node
+.Pa /dev/nvdimm_spaNNN
+is created, where
+.Dv NNN
+is the SPA position in the table.
+The node can be used to
+.Xr read 2 ,
+.Xr write 2 ,
+or
+.Xr mmap 2
+the device.
+.Pp
+Also, for each SPA, the geom provider
+.Pa spaNNN
+is created, which can be used to create a conventional filesystem (e.g.
+by
+.Xr newfs 8 )
+and
+.Xr mount 8
+it as any storage volume.
+Content accessible by
+.Pa /dev/nvdimm_spaNNN
+and
+.Pa /dev/spaNNN
+is coherent.
+.Sh SEE ALSO
+.Xr ACPI 4 ,
+.Xr GEOM 4 ,
+.Xr geom 8 ,
+.Xr mount 8 ,
+.Xr newfs 8 ,
+.Xr disk 9
+.Sh HISTORY
+The
+.Nm
+driver first appeared in
+.Fx 12.0 .
+.Sh AUTHORS
+.An -nosplit
+The
+.Nm
+driver was originally written by
+.An Konstantin Belousov Aq Mt kib at FreeBSD.org ,
+and then updated by
+.An D. Scott Phillips Aq Mt scottph at FreeBSD.org .
+.Sh BUGS
+The
+.Nm
+driver does not utilize the Block Window interface, so if the write to
+NVDIMM was interrupted due to a system crash or power outage,
+the corresponding page might be left in partially updated state.
+.Pp
+There is no support for Device-Specific Methods (DSM), used to report and
+control the device health and wearing.
+.Pp
+The driver depends on the
+.Xr pmap_largemap 9
+pmap interface, which is currently only implemented on amd64.
+The interface can be only reasonable implemented on 64bit architectures.
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