udev: Extract RAM properties from DMI information

Add memory_id program to set properties about the physical memory
devices in the system. This is useful on machines with removable memory
modules to show how the machine can be upgraded, and on all devices to
detect the actual RAM size, without relying on the OS accessible amount.

Closes: #16651

.gitattributes

@@ -1 +1,2 @@
 *.[ch] whitespace=tab-in-indent,trailing-space
+test/dmidecode-dumps/*.bin binary

rules.d/70-memory.rules

@@ -0,0 +1,8 @@
+# do not edit this file, it will be overwritten on update
+
+ACTION=="remove", GOTO="memory_end"
+SUBSYSTEM!="dmi", GOTO="memory_end"
+
+IMPORT{program}="dmi_memory_id"
+
+LABEL="memory_end"

rules.d/meson.build

@@ -17,6 +17,7 @@ rules = files('''
         60-serial.rules
         70-joystick.rules
         70-mouse.rules
+        70-memory.rules
         70-touchpad.rules
         75-net-description.rules
         75-probe_mtd.rules

src/udev/meson.build

@@ -174,6 +174,7 @@ foreach prog : [['ata_id/ata_id.c'],
                  'scsi_id/scsi_serial.c',
                  'scsi_id/scsi.h'],
                 ['v4l_id/v4l_id.c'],
+                ['dmi_memory_id/dmi_memory_id.c'],
                 ['mtd_probe/mtd_probe.c',
                  'mtd_probe/mtd_probe.h',
                  'mtd_probe/probe_smartmedia.c']]

test/dmidecode-dumps/Lenovo-ThinkPad-X280-dmidecode-dump.bin.txt

@@ -0,0 +1,33 @@
+MEMORY_ARRAY_LOCATION=System Board Or Motherboard
+MEMORY_ARRAY_MAX_CAPACITY=34359738368
+MEMORY_ARRAY_NUM_DEVICES=2
+MEMORY_DEVICE_0_TOTAL_WIDTH=64
+MEMORY_DEVICE_0_DATA_WIDTH=64
+MEMORY_DEVICE_0_SIZE=4294967296
+MEMORY_DEVICE_0_FORM_FACTOR=SODIMM
+MEMORY_DEVICE_0_LOCATOR=ChannelA-DIMM0
+MEMORY_DEVICE_0_BANK_LOCATOR=BANK 0
+MEMORY_DEVICE_0_TYPE=DDR4
+MEMORY_DEVICE_0_TYPE_DETAIL=Synchronous Unbuffered (Unregistered)
+MEMORY_DEVICE_0_SPEED_MTS=2400
+MEMORY_DEVICE_0_MANUFACTURER=0000
+MEMORY_DEVICE_0_SERIAL_NUMBER=00000000
+MEMORY_DEVICE_0_ASSET_TAG=None
+MEMORY_DEVICE_0_RANK=1
+MEMORY_DEVICE_0_CONFIGURED_SPEED_MTS=2400
+MEMORY_DEVICE_0_CONFIGURED_VOLTAGE=1
+MEMORY_DEVICE_1_TOTAL_WIDTH=64
+MEMORY_DEVICE_1_DATA_WIDTH=64
+MEMORY_DEVICE_1_SIZE=4294967296
+MEMORY_DEVICE_1_FORM_FACTOR=SODIMM
+MEMORY_DEVICE_1_LOCATOR=ChannelB-DIMM0
+MEMORY_DEVICE_1_BANK_LOCATOR=BANK 2
+MEMORY_DEVICE_1_TYPE=DDR4
+MEMORY_DEVICE_1_TYPE_DETAIL=Synchronous Unbuffered (Unregistered)
+MEMORY_DEVICE_1_SPEED_MTS=2400
+MEMORY_DEVICE_1_MANUFACTURER=0000
+MEMORY_DEVICE_1_SERIAL_NUMBER=00000000
+MEMORY_DEVICE_1_ASSET_TAG=None
+MEMORY_DEVICE_1_RANK=1
+MEMORY_DEVICE_1_CONFIGURED_SPEED_MTS=2400
+MEMORY_DEVICE_1_CONFIGURED_VOLTAGE=1

test/dmidecode-dumps/Lenovo-Thinkcentre-m720s-dmidecode-dump.bin.txt

@@ -0,0 +1,67 @@
+MEMORY_ARRAY_LOCATION=System Board Or Motherboard
+MEMORY_ARRAY_MAX_CAPACITY=68719476736
+MEMORY_ARRAY_NUM_DEVICES=4
+MEMORY_DEVICE_0_TOTAL_WIDTH=64
+MEMORY_DEVICE_0_DATA_WIDTH=64
+MEMORY_DEVICE_0_SIZE=8589934592
+MEMORY_DEVICE_0_FORM_FACTOR=DIMM
+MEMORY_DEVICE_0_LOCATOR=ChannelA-DIMM0
+MEMORY_DEVICE_0_BANK_LOCATOR=BANK 0
+MEMORY_DEVICE_0_TYPE=DDR4
+MEMORY_DEVICE_0_TYPE_DETAIL=Synchronous
+MEMORY_DEVICE_0_SPEED_MTS=2667
+MEMORY_DEVICE_0_MANUFACTURER=Samsung
+MEMORY_DEVICE_0_SERIAL_NUMBER=416433E9
+MEMORY_DEVICE_0_ASSET_TAG=9876543210
+MEMORY_DEVICE_0_PART_NUMBER=M378A1K43CB2-CTD
+MEMORY_DEVICE_0_RANK=1
+MEMORY_DEVICE_0_CONFIGURED_SPEED_MTS=2400
+MEMORY_DEVICE_0_MINIMUM_VOLTAGE=1
+MEMORY_DEVICE_0_MAXIMUM_VOLTAGE=1
+MEMORY_DEVICE_0_CONFIGURED_VOLTAGE=1
+MEMORY_DEVICE_1_TOTAL_WIDTH=64
+MEMORY_DEVICE_1_DATA_WIDTH=64
+MEMORY_DEVICE_1_SIZE=8589934592
+MEMORY_DEVICE_1_FORM_FACTOR=DIMM
+MEMORY_DEVICE_1_LOCATOR=ChannelA-DIMM1
+MEMORY_DEVICE_1_BANK_LOCATOR=BANK 1
+MEMORY_DEVICE_1_TYPE=DDR4
+MEMORY_DEVICE_1_TYPE_DETAIL=Synchronous
+MEMORY_DEVICE_1_SPEED_MTS=2400
+MEMORY_DEVICE_1_MANUFACTURER=859B
+MEMORY_DEVICE_1_SERIAL_NUMBER=A02550A6
+MEMORY_DEVICE_1_ASSET_TAG=9876543210
+MEMORY_DEVICE_1_PART_NUMBER=BLT8G4D26AFTA.16FBD
+MEMORY_DEVICE_1_RANK=2
+MEMORY_DEVICE_1_CONFIGURED_SPEED_MTS=2400
+MEMORY_DEVICE_1_MINIMUM_VOLTAGE=1
+MEMORY_DEVICE_1_MAXIMUM_VOLTAGE=1
+MEMORY_DEVICE_1_CONFIGURED_VOLTAGE=1
+MEMORY_DEVICE_2_PRESENT=0
+MEMORY_DEVICE_2_FORM_FACTOR=Unknown
+MEMORY_DEVICE_2_LOCATOR=ChannelB-DIMM0
+MEMORY_DEVICE_2_BANK_LOCATOR=BANK 2
+MEMORY_DEVICE_2_TYPE=Unknown
+MEMORY_DEVICE_2_TYPE_DETAIL=None
+MEMORY_DEVICE_2_MANUFACTURER=Not Specified
+MEMORY_DEVICE_2_SERIAL_NUMBER=Not Specified
+MEMORY_DEVICE_2_ASSET_TAG=Not Specified
+MEMORY_DEVICE_2_PART_NUMBER=Not Specified
+MEMORY_DEVICE_3_TOTAL_WIDTH=64
+MEMORY_DEVICE_3_DATA_WIDTH=64
+MEMORY_DEVICE_3_SIZE=8589934592
+MEMORY_DEVICE_3_FORM_FACTOR=DIMM
+MEMORY_DEVICE_3_LOCATOR=ChannelB-DIMM1
+MEMORY_DEVICE_3_BANK_LOCATOR=BANK 3
+MEMORY_DEVICE_3_TYPE=DDR4
+MEMORY_DEVICE_3_TYPE_DETAIL=Synchronous
+MEMORY_DEVICE_3_SPEED_MTS=2400
+MEMORY_DEVICE_3_MANUFACTURER=859B
+MEMORY_DEVICE_3_SERIAL_NUMBER=A0254F38
+MEMORY_DEVICE_3_ASSET_TAG=9876543210
+MEMORY_DEVICE_3_PART_NUMBER=BLT8G4D26AFTA.16FBD
+MEMORY_DEVICE_3_RANK=2
+MEMORY_DEVICE_3_CONFIGURED_SPEED_MTS=2400
+MEMORY_DEVICE_3_MINIMUM_VOLTAGE=1
+MEMORY_DEVICE_3_MAXIMUM_VOLTAGE=1
+MEMORY_DEVICE_3_CONFIGURED_VOLTAGE=1

test/meson.build

@@ -133,4 +133,11 @@ if conf.get('ENABLE_HWDB') == 1
         endif
 endif
 
+if want_tests != false
+        udev_dmi_memory_id_test = find_program('udev-dmi-memory-id-test.sh')
+        test('udev-dmi-memory-id-test',
+                udev_dmi_memory_id_test,
+                timeout : 90)
+endif
+
 subdir('fuzz')

test/udev-dmi-memory-id-test.sh

@@ -0,0 +1,31 @@
+#!/bin/sh
+# SPDX-License-Identifier: LGPL-2.1-or-later
+#
+
+set -e
+
+export SYSTEMD_LOG_LEVEL=info
+ROOTDIR=$(dirname $(dirname $(readlink -f $0)))
+UDEV_DMI_MEMORY_ID=./src/udev/dmi_memory_id
+
+if [ ! -x "$UDEV_DMI_MEMORY_ID" ]; then
+    echo "$UDEV_DMI_MEMORY_ID does not exist, please build first"
+    exit 1
+fi
+
+D=$(mktemp --tmpdir --directory "udev-dmi-memory-id.XXXXXXXXXX")
+trap "rm -rf '$D'" EXIT INT QUIT PIPE
+
+for i in $ROOTDIR/test/dmidecode-dumps/*.bin ; do
+    $("$UDEV_DMI_MEMORY_ID" -F "$i" 2>&1 > "$D"/out.txt) && rc= || rc=$?
+    if [ -n "$rc" ]; then
+        echo "$UDEV_DMI_MEMORY_ID returned $rc"
+        exit $rc
+    fi
+    err=$(diff -u "$D"/out.txt "$i.txt" 2>&1) && rc= || rc=$?
+    if [ -n "$rc" ]; then
+        echo "Parsing DMI memory information from \"$i\" didn't match expected:"
+        echo "$err"
+        exit $rc
+    fi
+done