How do I list loaded Linux module parameter values?

You can do it by using this simple one way command, which uses the /proc/modules and /sys virtual filesystems:

cat /proc/modules | cut -f 1 -d " " | while read module; do \
 echo "Module: $module"; \
 if [ -d "/sys/module/$module/parameters" ]; then \
  ls /sys/module/$module/parameters/ | while read parameter; do \
   echo -n "Parameter: $parameter --> "; \
   cat /sys/module/$module/parameters/$parameter; \
  done; \
 fi; \
 echo; \
done

You will obtain an output like this:

...
...
Module: vboxnetadp

Module: vboxnetflt

Module: vboxdrv
Parameter: force_async_tsc --> 0

Module: binfmt_misc

Module: uinput

Module: fuse
Parameter: max_user_bgreq --> 2047
Parameter: max_user_congthresh --> 2047

Module: md_mod
Parameter: new_array --> cat: /sys/module/md_mod/parameters/new_array: Permission denied
Parameter: start_dirty_degraded --> 0
Parameter: start_ro --> 0

Module: loop
Parameter: max_loop --> 0
Parameter: max_part --> 0

Module: kvm_intel
Parameter: emulate_invalid_guest_state --> N
Parameter: ept --> Y
Parameter: fasteoi --> Y
Parameter: flexpriority --> Y
Parameter: nested --> N
Parameter: ple_gap --> 0
Parameter: ple_window --> 4096
Parameter: unrestricted_guest --> Y
Parameter: vmm_exclusive --> Y
Parameter: vpid --> Y
Parameter: yield_on_hlt --> Y

Module: kvm
Parameter: allow_unsafe_assigned_interrupts --> N
Parameter: ignore_msrs --> N
Parameter: min_timer_period_us --> 500

Module: tpm_infineon

Module: joydev

Module: snd_hda_codec_hdmi
Parameter: static_hdmi_pcm --> N
...
...

Hope this helps.

You can use the command systool -vm <Module name>. It comes with the sysfsutils package on most systems.

This is what the output will look like, there is a section Parameters:

linux ~ # systool -vm btusb
Module = "btusb"

  Attributes:
    coresize            = "40960"
    initsize            = "0"
    initstate           = "live"
    refcnt              = "0"
    srcversion          = "D69A7EC073BC0145C2DE5C3"
    taint               = ""
    uevent              = <store method only>
    version             = "0.8"

  Parameters:
    disable_scofix      = "N"
    force_scofix        = "N"
    reset               = "Y"

  Sections:
    .bss                = "0xffffffffa090d800"
    .data               = "0xffffffffa090d000"
    .exit.text          = "0xffffffffa09096ff"
    .gnu.linkonce.this_module= "0xffffffffa090d4c0"
    .init.text          = "0xffffffffa0910000"
    .note.gnu.build-id  = "0xffffffffa090a000"
    .rodata             = "0xffffffffa090b060"
    .rodata.str1.1      = "0xffffffffa090a024"
    .rodata.str1.8      = "0xffffffffa090a2b0"
    .smp_locks          = "0xffffffffa090af84"
    .strtab             = "0xffffffffa0912668"
    .symtab             = "0xffffffffa0911000"
    .text               = "0xffffffffa0905000"
    __mcount_loc        = "0xffffffffa090c3d8"
    __param             = "0xffffffffa090c360"
    __verbose           = "0xffffffffa090d0f8"

grep -H '' /sys/module/ath9k*/parameters/*

/sys/module/ath9k/parameters/blink:1
/sys/module/ath9k/parameters/bt_ant_diversity:0
/sys/module/ath9k/parameters/btcoex_enable:0
/sys/module/ath9k/parameters/nohwcrypt:1
/sys/module/ath9k/parameters/ps_enable:0

grep -H '' /sys/module/acpi_cpufreq/parameters/*
/sys/module/acpi_cpufreq/parameters/acpi_pstate_strict:0

You could use the "modinfo(8)" command to get available load time parameters for a module. For instance:

# modinfo e100 | grep parm
parm:           debug:Debug level (0=none,...,16=all) (int)
parm:           eeprom_bad_csum_allow:Allow bad eeprom checksums (int)
parm:           use_io:Force use of i/o access mode (int)

As for getting the parameters of loaded modules, try combining the modinfo command with a simple "lsmod | awk '{ print $1 }'"

As in:

lsmod | awk '{print $1 }'combi > myfile.txt
tail -n +2 myfile.txt > myfile.txt.tmp && mv myfile.txt.tmp myfile.txt
while read -r LINE; do echo "$LINE">>results.txt;modinfo "$LINE" | grep ^desc>>results.txt;modinfo "$LINE" | grep parm>> results.txt; done < myfile.txt

Would come out ugly as a comment, but I did this check on my system..

cat /proc/modules  | cut -d " " -f1 | while read mod; do
   test -d /sys/module/$mod/parameters || echo modinfo $mod | grep parm; 
done

To check if modules without parameters in /sys show up as having parameters in modinfo but I couldnt find any.?

Does your module suggest there are parameters passable with modinfo when you check it that way but there are none in /sys for it? Certainly on my system I was unable to find any examples of this using the command provided above.

EDIT: All this is wrong given that if you do actually check what I did, you'll note that echo mod $mod | grep parm will never actually result in a answer.

If you do the following instead..

cat /proc/modules  | cut -d " " -f1 | while read mod; do
    test -d /sys/module/$mod/parameters || (modinfo $mod | grep parm && echo $mod)
done

You'll find all sorts of modules that dont contain a parameters directory in /sys/module/$mod but have parameters contained inside of their instances at run time.

Inversely, you can also do this:

for mod in $(cat /proc/modules | cut -d" " -f1; do
  if [ -d /sys/module/$mod/parameters ]; then 
    for p in /sys/module/$mod/parameters/*; do 
      p=$(basename $p)
      modinfo $mod -F parm | grep -q $p || echo $mod $p
    done;
  fi;
done

To find examples of modules that do have a parameters value in /sys/module/$mod/parameters but dont have a parameter set in modinfo.

For iwlwifi and other modules I used this:

 grep [[:alnum:]] /sys/module/iwl*/parameters/*

and I get this output:

 /sys/module/iwlmvm/parameters/init_dbg:N
 /sys/module/iwlmvm/parameters/power_scheme:2
 /sys/module/iwlmvm/parameters/tfd_q_hang_detect:Y
 /sys/module/iwlwifi/parameters/11n_disable:0
 /sys/module/iwlwifi/parameters/amsdu_size:0
 /sys/module/iwlwifi/parameters/antenna_coupling:0
 /sys/module/iwlwifi/parameters/bt_coex_active:Y
 /sys/module/iwlwifi/parameters/d0i3_disable:Y
 /sys/module/iwlwifi/parameters/d0i3_timeout:1000
 /sys/module/iwlwifi/parameters/disable_11ac:N
 /sys/module/iwlwifi/parameters/fw_monitor:N
 /sys/module/iwlwifi/parameters/fw_restart:Y
 /sys/module/iwlwifi/parameters/lar_disable:N
 /sys/module/iwlwifi/parameters/led_mode:0
 /sys/module/iwlwifi/parameters/nvm_file:(null)
 /sys/module/iwlwifi/parameters/power_level:0
 /sys/module/iwlwifi/parameters/power_save:N
 /sys/module/iwlwifi/parameters/swcrypto:0
 /sys/module/iwlwifi/parameters/uapsd_disable:3

So I guess you could try something like:

 grep [[:alnum:]] /sys/module/<module_name>/parameters/*

Let me know if this works for you.

Working off of katriel's work, you can get a (admittedly ugly) one-liner by combining the two of them in a bash loop:

for i in `lsmod | awk '{print $1}'`; do echo "$i: "; modinfo $i | grep parm; done