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

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