blog/data/2011-01-23-hardware-info.txt

   1 Title: Which module is loaded for a given PCI and USB device?
   2 Tags: english, debian
   3 Date: 2011-01-23 00:20
   4
   5 <p>In the
   6 <a href="http://packages.qa.debian.org/discover-data">discover-data</a>
   7 package in Debian, there is a script to report useful information
   8 about the running hardware for use when people report missing
   9 information.  One part of this script that I find very useful when
  10 debugging hardware problems, is the part mapping loaded kernel module
  11 to the PCI device it claims.  It allow me to quickly see if the kernel
  12 module I expect is driving the hardware I am struggling with.  To see
  13 the output, make sure discover-data is installed and run
  14 <tt>/usr/share/bug/discover-data 3>&1</tt>.  The relevant output on
  15 one of my machines like this:</p>
  16
  17 <pre>
  18 loaded modules:
  19 10de:03eb i2c_nforce2
  20 10de:03f1 ohci_hcd
  21 10de:03f2 ehci_hcd
  22 10de:03f0 snd_hda_intel
  23 10de:03ec pata_amd
  24 10de:03f6 sata_nv
  25 1022:1103 k8temp
  26 109e:036e bttv
  27 109e:0878 snd_bt87x
  28 11ab:4364 sky2
  29 </pre>
  30
  31 <p>The code in question look like this, slightly modified for
  32 readability and to drop the output to file descriptor 3:</p>
  33
  34 <pre>
  35 if [ -d /sys/bus/pci/devices/ ] ; then
  36     echo loaded pci modules:
  37     (
  38         cd /sys/bus/pci/devices/
  39         for address in * ; do
  40             if [ -d "$address/driver/module" ] ; then
  41                 module=`cd $address/driver/module ; pwd -P | xargs basename`
  42                 if grep -q "^$module " /proc/modules ; then
  43                     address=$(echo $address |sed s/0000://)
  44                     id=`lspci -n -s $address | tail -n 1 | awk '{print $3}'`
  45                     echo "$id $module"
  46                 fi
  47             fi
  48         done
  49     )
  50     echo
  51 fi
  52 </pre>
  53
  54 <p>Similar code could be used to extract USB device module
  55 mappings:</p>
  56
  57 <pre>
  58 if [ -d /sys/bus/usb/devices/ ] ; then
  59     echo loaded usb modules:
  60     (
  61         cd /sys/bus/usb/devices/
  62         for address in * ; do
  63             if [ -d "$address/driver/module" ] ; then
  64                 module=`cd $address/driver/module ; pwd -P | xargs basename`
  65                 if grep -q "^$module " /proc/modules ; then
  66                     address=$(echo $address |sed s/0000://)
  67                     id=$(lsusb -s $address | tail -n 1 | awk '{print $6}')
  68                     if [ "$id" ] ; then
  69                         echo "$id $module"
  70                     fi
  71                 fi
  72             fi
  73         done
  74     )
  75     echo
  76 fi
  77 </pre>
  78
  79 <p>This might perhaps be something to include in other tools as
  80 well.</p>