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1=============2Ioctl Numbers3=============4 519 October 19996 7Michael Elizabeth Chastain8<mec@shout.net>9 10If you are adding new ioctl's to the kernel, you should use the _IO11macros defined in <linux/ioctl.h>:12 13 ====== == ============================================14 _IO an ioctl with no parameters15 _IOW an ioctl with write parameters (copy_from_user)16 _IOR an ioctl with read parameters (copy_to_user)17 _IOWR an ioctl with both write and read parameters.18 ====== == ============================================19 20'Write' and 'read' are from the user's point of view, just like the21system calls 'write' and 'read'. For example, a SET_FOO ioctl would22be _IOW, although the kernel would actually read data from user space;23a GET_FOO ioctl would be _IOR, although the kernel would actually write24data to user space.25 26The first argument to _IO, _IOW, _IOR, or _IOWR is an identifying letter27or number from the table below. Because of the large number of drivers,28many drivers share a partial letter with other drivers.29 30If you are writing a driver for a new device and need a letter, pick an31unused block with enough room for expansion: 32 to 256 ioctl commands.32You can register the block by patching this file and submitting the33patch to Linus Torvalds. Or you can e-mail me at <mec@shout.net> and34I'll register one for you.35 36The second argument to _IO, _IOW, _IOR, or _IOWR is a sequence number37to distinguish ioctls from each other. The third argument to _IOW,38_IOR, or _IOWR is the type of the data going into the kernel or coming39out of the kernel (e.g. 'int' or 'struct foo'). NOTE! Do NOT use40sizeof(arg) as the third argument as this results in your ioctl thinking41it passes an argument of type size_t.42 43Some devices use their major number as the identifier; this is OK, as44long as it is unique. Some devices are irregular and don't follow any45convention at all.46 47Following this convention is good because:48 49(1) Keeping the ioctl's globally unique helps error checking:50 if a program calls an ioctl on the wrong device, it will get an51 error rather than some unexpected behaviour.52 53(2) The 'strace' build procedure automatically finds ioctl numbers54 defined with _IO, _IOW, _IOR, or _IOWR.55 56(3) 'strace' can decode numbers back into useful names when the57 numbers are unique.58 59(4) People looking for ioctls can grep for them more easily when60 this convention is used to define the ioctl numbers.61 62(5) When following the convention, the driver code can use generic63 code to copy the parameters between user and kernel space.64 65This table lists ioctls visible from user land for Linux/x86. It contains66most drivers up to 2.6.31, but I know I am missing some. There has been67no attempt to list non-X86 architectures or ioctls from drivers/staging/.68 69==== ===== ======================================================= ================================================================70Code Seq# Include File Comments71 (hex)72==== ===== ======================================================= ================================================================730x00 00-1F linux/fs.h conflict!740x00 00-1F scsi/scsi_ioctl.h conflict!750x00 00-1F linux/fb.h conflict!760x00 00-1F linux/wavefront.h conflict!770x02 all linux/fd.h780x03 all linux/hdreg.h790x04 D2-DC linux/umsdos_fs.h Dead since 2.6.11, but don't reuse these.800x06 all linux/lp.h810x07 9F-D0 linux/vmw_vmci_defs.h, uapi/linux/vm_sockets.h820x09 all linux/raid/md_u.h830x10 00-0F drivers/char/s390/vmcp.h840x10 10-1F arch/s390/include/uapi/sclp_ctl.h850x10 20-2F arch/s390/include/uapi/asm/hypfs.h860x12 all linux/fs.h BLK* ioctls87 linux/blkpg.h880x15 all linux/fs.h FS_IOC_* ioctls890x1b all InfiniBand Subsystem90 <http://infiniband.sourceforge.net/>910x20 all drivers/cdrom/cm206.h920x22 all scsi/sg.h930x3E 00-0F linux/counter.h <mailto:linux-iio@vger.kernel.org>94'!' 00-1F uapi/linux/seccomp.h95'#' 00-3F IEEE 1394 Subsystem96 Block for the entire subsystem97'$' 00-0F linux/perf_counter.h, linux/perf_event.h98'%' 00-0F include/uapi/linux/stm.h System Trace Module subsystem99 <mailto:alexander.shishkin@linux.intel.com>100'&' 00-07 drivers/firewire/nosy-user.h101'*' 00-1F uapi/linux/user_events.h User Events Subsystem102 <mailto:linux-trace-kernel@vger.kernel.org>103'1' 00-1F linux/timepps.h PPS kit from Ulrich Windl104 <ftp://ftp.de.kernel.org/pub/linux/daemons/ntp/PPS/>105'2' 01-04 linux/i2o.h106'3' 00-0F drivers/s390/char/raw3270.h conflict!107'3' 00-1F linux/suspend_ioctls.h, conflict!108 kernel/power/user.c109'8' all SNP8023 advanced NIC card110 <mailto:mcr@solidum.com>111';' 64-7F linux/vfio.h112';' 80-FF linux/iommufd.h113'=' 00-3f uapi/linux/ptp_clock.h <mailto:richardcochran@gmail.com>114'@' 00-0F linux/radeonfb.h conflict!115'@' 00-0F drivers/video/aty/aty128fb.c conflict!116'A' 00-1F linux/apm_bios.h conflict!117'A' 00-0F linux/agpgart.h, conflict!118 drivers/char/agp/compat_ioctl.h119'A' 00-7F sound/asound.h conflict!120'B' 00-1F linux/cciss_ioctl.h conflict!121'B' 00-0F include/linux/pmu.h conflict!122'B' C0-FF advanced bbus <mailto:maassen@uni-freiburg.de>123'B' 00-0F xen/xenbus_dev.h conflict!124'C' all linux/soundcard.h conflict!125'C' 01-2F linux/capi.h conflict!126'C' F0-FF drivers/net/wan/cosa.h conflict!127'D' all arch/s390/include/asm/dasd.h128'D' 40-5F drivers/scsi/dpt/dtpi_ioctl.h Dead since 2022129'D' 05 drivers/scsi/pmcraid.h130'E' all linux/input.h conflict!131'E' 00-0F xen/evtchn.h conflict!132'F' all linux/fb.h conflict!133'F' 01-02 drivers/scsi/pmcraid.h conflict!134'F' 20 drivers/video/fsl-diu-fb.h conflict!135'F' 20 linux/ivtvfb.h conflict!136'F' 20 linux/matroxfb.h conflict!137'F' 20 drivers/video/aty/atyfb_base.c conflict!138'F' 00-0F video/da8xx-fb.h conflict!139'F' 80-8F linux/arcfb.h conflict!140'F' DD video/sstfb.h conflict!141'G' 00-3F drivers/misc/sgi-gru/grulib.h conflict!142'G' 00-0F xen/gntalloc.h, xen/gntdev.h conflict!143'H' 00-7F linux/hiddev.h conflict!144'H' 00-0F linux/hidraw.h conflict!145'H' 01 linux/mei.h conflict!146'H' 02 linux/mei.h conflict!147'H' 03 linux/mei.h conflict!148'H' 00-0F sound/asound.h conflict!149'H' 20-40 sound/asound_fm.h conflict!150'H' 80-8F sound/sfnt_info.h conflict!151'H' 10-8F sound/emu10k1.h conflict!152'H' 10-1F sound/sb16_csp.h conflict!153'H' 10-1F sound/hda_hwdep.h conflict!154'H' 40-4F sound/hdspm.h conflict!155'H' 40-4F sound/hdsp.h conflict!156'H' 90 sound/usb/usx2y/usb_stream.h157'H' 00-0F uapi/misc/habanalabs.h conflict!158'H' A0 uapi/linux/usb/cdc-wdm.h159'H' C0-F0 net/bluetooth/hci.h conflict!160'H' C0-DF net/bluetooth/hidp/hidp.h conflict!161'H' C0-DF net/bluetooth/cmtp/cmtp.h conflict!162'H' C0-DF net/bluetooth/bnep/bnep.h conflict!163'H' F1 linux/hid-roccat.h <mailto:erazor_de@users.sourceforge.net>164'H' F8-FA sound/firewire.h165'I' all linux/isdn.h conflict!166'I' 00-0F drivers/isdn/divert/isdn_divert.h conflict!167'I' 40-4F linux/mISDNif.h conflict!168'K' all linux/kd.h169'L' 00-1F linux/loop.h conflict!170'L' 10-1F drivers/scsi/mpt3sas/mpt3sas_ctl.h conflict!171'L' E0-FF linux/ppdd.h encrypted disk device driver172 <http://linux01.gwdg.de/~alatham/ppdd.html>173'M' all linux/soundcard.h conflict!174'M' 01-16 mtd/mtd-abi.h conflict!175 and drivers/mtd/mtdchar.c176'M' 01-03 drivers/scsi/megaraid/megaraid_sas.h177'M' 00-0F drivers/video/fsl-diu-fb.h conflict!178'N' 00-1F drivers/usb/scanner.h179'N' 40-7F drivers/block/nvme.c180'N' 80-8F uapi/linux/ntsync.h NT synchronization primitives181 <mailto:wine-devel@winehq.org>182'O' 00-06 mtd/ubi-user.h UBI183'P' all linux/soundcard.h conflict!184'P' 60-6F sound/sscape_ioctl.h conflict!185'P' 00-0F drivers/usb/class/usblp.c conflict!186'P' 01-09 drivers/misc/pci_endpoint_test.c conflict!187'P' 00-0F xen/privcmd.h conflict!188'P' 00-05 linux/tps6594_pfsm.h conflict!189'Q' all linux/soundcard.h190'R' 00-1F linux/random.h conflict!191'R' 01 linux/rfkill.h conflict!192'R' 20-2F linux/trace_mmap.h193'R' C0-DF net/bluetooth/rfcomm.h194'R' E0 uapi/linux/fsl_mc.h195'S' all linux/cdrom.h conflict!196'S' 80-81 scsi/scsi_ioctl.h conflict!197'S' 82-FF scsi/scsi.h conflict!198'S' 00-7F sound/asequencer.h conflict!199'T' all linux/soundcard.h conflict!200'T' 00-AF sound/asound.h conflict!201'T' all arch/x86/include/asm/ioctls.h conflict!202'T' C0-DF linux/if_tun.h conflict!203'U' all sound/asound.h conflict!204'U' 00-CF linux/uinput.h conflict!205'U' 00-EF linux/usbdevice_fs.h206'U' C0-CF drivers/bluetooth/hci_uart.h207'V' all linux/vt.h conflict!208'V' all linux/videodev2.h conflict!209'V' C0 linux/ivtvfb.h conflict!210'V' C0 linux/ivtv.h conflict!211'V' C0 media/si4713.h conflict!212'W' 00-1F linux/watchdog.h conflict!213'W' 00-1F linux/wanrouter.h conflict! (pre 3.9)214'W' 00-3F sound/asound.h conflict!215'W' 40-5F drivers/pci/switch/switchtec.c216'W' 60-61 linux/watch_queue.h217'X' all fs/xfs/xfs_fs.h, conflict!218 fs/xfs/linux-2.6/xfs_ioctl32.h,219 include/linux/falloc.h,220 linux/fs.h,221'X' all fs/ocfs2/ocfs_fs.h conflict!222'X' 01 linux/pktcdvd.h conflict!223'Z' 14-15 drivers/message/fusion/mptctl.h224'[' 00-3F linux/usb/tmc.h USB Test and Measurement Devices225 <mailto:gregkh@linuxfoundation.org>226'a' all linux/atm*.h, linux/sonet.h ATM on linux227 <http://lrcwww.epfl.ch/>228'a' 00-0F drivers/crypto/qat/qat_common/adf_cfg_common.h conflict! qat driver229'b' 00-FF conflict! bit3 vme host bridge230 <mailto:natalia@nikhefk.nikhef.nl>231'b' 00-0F linux/dma-buf.h conflict!232'c' 00-7F linux/comstats.h conflict!233'c' 00-7F linux/coda.h conflict!234'c' 00-1F linux/chio.h conflict!235'c' 80-9F arch/s390/include/asm/chsc.h conflict!236'c' A0-AF arch/x86/include/asm/msr.h conflict!237'd' 00-FF linux/char/drm/drm.h conflict!238'd' 02-40 pcmcia/ds.h conflict!239'd' F0-FF linux/digi1.h240'e' all linux/digi1.h conflict!241'f' 00-1F linux/ext2_fs.h conflict!242'f' 00-1F linux/ext3_fs.h conflict!243'f' 00-0F fs/jfs/jfs_dinode.h conflict!244'f' 00-0F fs/ext4/ext4.h conflict!245'f' 00-0F linux/fs.h conflict!246'f' 00-0F fs/ocfs2/ocfs2_fs.h conflict!247'f' 13-27 linux/fscrypt.h248'f' 81-8F linux/fsverity.h249'g' 00-0F linux/usb/gadgetfs.h250'g' 20-2F linux/usb/g_printer.h251'h' 00-7F conflict! Charon filesystem252 <mailto:zapman@interlan.net>253'h' 00-1F linux/hpet.h conflict!254'h' 80-8F fs/hfsplus/ioctl.c255'i' 00-3F linux/i2o-dev.h conflict!256'i' 0B-1F linux/ipmi.h conflict!257'i' 80-8F linux/i8k.h258'i' 90-9F `linux/iio/*.h` IIO259'j' 00-3F linux/joystick.h260'k' 00-0F linux/spi/spidev.h conflict!261'k' 00-05 video/kyro.h conflict!262'k' 10-17 linux/hsi/hsi_char.h HSI character device263'l' 00-3F linux/tcfs_fs.h transparent cryptographic file system264 <http://web.archive.org/web/%2A/http://mikonos.dia.unisa.it/tcfs>265'l' 40-7F linux/udf_fs_i.h in development:266 <https://github.com/pali/udftools>267'm' 00-09 linux/mmtimer.h conflict!268'm' all linux/mtio.h conflict!269'm' all linux/soundcard.h conflict!270'm' all linux/synclink.h conflict!271'm' 00-19 drivers/message/fusion/mptctl.h conflict!272'm' 00 drivers/scsi/megaraid/megaraid_ioctl.h conflict!273'n' 00-7F linux/ncp_fs.h and fs/ncpfs/ioctl.c274'n' 80-8F uapi/linux/nilfs2_api.h NILFS2275'n' E0-FF linux/matroxfb.h matroxfb276'o' 00-1F fs/ocfs2/ocfs2_fs.h OCFS2277'o' 00-03 mtd/ubi-user.h conflict! (OCFS2 and UBI overlaps)278'o' 40-41 mtd/ubi-user.h UBI279'o' 01-A1 `linux/dvb/*.h` DVB280'p' 00-0F linux/phantom.h conflict! (OpenHaptics needs this)281'p' 00-1F linux/rtc.h conflict!282'p' 40-7F linux/nvram.h283'p' 80-9F linux/ppdev.h user-space parport284 <mailto:tim@cyberelk.net>285'p' A1-A5 linux/pps.h LinuxPPS286 <mailto:giometti@linux.it>287'q' 00-1F linux/serio.h288'q' 80-FF linux/telephony.h Internet PhoneJACK, Internet LineJACK289 linux/ixjuser.h <http://web.archive.org/web/%2A/http://www.quicknet.net>290'r' 00-1F linux/msdos_fs.h and fs/fat/dir.c291's' all linux/cdk.h292't' 00-7F linux/ppp-ioctl.h293't' 80-8F linux/isdn_ppp.h294't' 90-91 linux/toshiba.h toshiba and toshiba_acpi SMM295'u' 00-1F linux/smb_fs.h gone296'u' 00-2F linux/ublk_cmd.h conflict!297'u' 20-3F linux/uvcvideo.h USB video class host driver298'u' 40-4f linux/udmabuf.h userspace dma-buf misc device299'v' 00-1F linux/ext2_fs.h conflict!300'v' 00-1F linux/fs.h conflict!301'v' 00-0F linux/sonypi.h conflict!302'v' 00-0F media/v4l2-subdev.h conflict!303'v' 20-27 arch/powerpc/include/uapi/asm/vas-api.h VAS API304'v' C0-FF linux/meye.h conflict!305'w' all CERN SCI driver306'y' 00-1F packet based user level communications307 <mailto:zapman@interlan.net>308'z' 00-3F CAN bus card conflict!309 <mailto:hdstich@connectu.ulm.circular.de>310'z' 40-7F CAN bus card conflict!311 <mailto:oe@port.de>312'z' 10-4F drivers/s390/crypto/zcrypt_api.h conflict!313'|' 00-7F linux/media.h3140x80 00-1F linux/fb.h3150x81 00-1F linux/vduse.h3160x89 00-06 arch/x86/include/asm/sockios.h3170x89 0B-DF linux/sockios.h3180x89 E0-EF linux/sockios.h SIOCPROTOPRIVATE range3190x89 F0-FF linux/sockios.h SIOCDEVPRIVATE range3200x8A 00-1F linux/eventpoll.h3210x8B all linux/wireless.h3220x8C 00-3F WiNRADiO driver323 <http://www.winradio.com.au/>3240x90 00 drivers/cdrom/sbpcd.h3250x92 00-0F drivers/usb/mon/mon_bin.c3260x93 60-7F linux/auto_fs.h3270x94 all fs/btrfs/ioctl.h Btrfs filesystem328 and linux/fs.h some lifted to vfs/generic3290x97 00-7F fs/ceph/ioctl.h Ceph file system3300x99 00-0F 537-Addinboard driver331 <mailto:buk@buks.ipn.de>3320xA0 all linux/sdp/sdp.h Industrial Device Project333 <mailto:kenji@bitgate.com>3340xA1 0 linux/vtpm_proxy.h TPM Emulator Proxy Driver3350xA2 all uapi/linux/acrn.h ACRN hypervisor3360xA3 80-8F Port ACL in development:337 <mailto:tlewis@mindspring.com>3380xA3 90-9F linux/dtlk.h3390xA4 00-1F uapi/linux/tee.h Generic TEE subsystem3400xA4 00-1F uapi/asm/sgx.h <mailto:linux-sgx@vger.kernel.org>3410xA5 01-05 linux/surface_aggregator/cdev.h Microsoft Surface Platform System Aggregator342 <mailto:luzmaximilian@gmail.com>3430xA5 20-2F linux/surface_aggregator/dtx.h Microsoft Surface DTX driver344 <mailto:luzmaximilian@gmail.com>3450xAA 00-3F linux/uapi/linux/userfaultfd.h3460xAB 00-1F linux/nbd.h3470xAC 00-1F linux/raw.h3480xAD 00 Netfilter device in development:349 <mailto:rusty@rustcorp.com.au>3500xAE 00-1F linux/kvm.h Kernel-based Virtual Machine351 <mailto:kvm@vger.kernel.org>3520xAE 40-FF linux/kvm.h Kernel-based Virtual Machine353 <mailto:kvm@vger.kernel.org>3540xAE 20-3F linux/nitro_enclaves.h Nitro Enclaves3550xAF 00-1F linux/fsl_hypervisor.h Freescale hypervisor3560xB0 all RATIO devices in development:357 <mailto:vgo@ratio.de>3580xB1 00-1F PPPoX359 <mailto:mostrows@styx.uwaterloo.ca>3600xB2 00 arch/powerpc/include/uapi/asm/papr-vpd.h powerpc/pseries VPD API361 <mailto:linuxppc-dev>3620xB2 01-02 arch/powerpc/include/uapi/asm/papr-sysparm.h powerpc/pseries system parameter API363 <mailto:linuxppc-dev>3640xB3 00 linux/mmc/ioctl.h3650xB4 00-0F linux/gpio.h <mailto:linux-gpio@vger.kernel.org>3660xB5 00-0F uapi/linux/rpmsg.h <mailto:linux-remoteproc@vger.kernel.org>3670xB6 all linux/fpga-dfl.h3680xB7 all uapi/linux/remoteproc_cdev.h <mailto:linux-remoteproc@vger.kernel.org>3690xB7 all uapi/linux/nsfs.h <mailto:Andrei Vagin <avagin@openvz.org>>3700xB8 01-02 uapi/misc/mrvl_cn10k_dpi.h Marvell CN10K DPI driver3710xC0 00-0F linux/usb/iowarrior.h3720xCA 00-0F uapi/misc/cxl.h3730xCA 10-2F uapi/misc/ocxl.h3740xCA 80-BF uapi/scsi/cxlflash_ioctl.h3750xCB 00-1F CBM serial IEC bus in development:376 <mailto:michael.klein@puffin.lb.shuttle.de>3770xCC 00-0F drivers/misc/ibmvmc.h pseries VMC driver3780xCD 01 linux/reiserfs_fs.h3790xCE 01-02 uapi/linux/cxl_mem.h Compute Express Link Memory Devices3800xCF 02 fs/smb/client/cifs_ioctl.h3810xDB 00-0F drivers/char/mwave/mwavepub.h3820xDD 00-3F ZFCP device driver see drivers/s390/scsi/383 <mailto:aherrman@de.ibm.com>3840xE5 00-3F linux/fuse.h3850xEC 00-01 drivers/platform/chrome/cros_ec_dev.h ChromeOS EC driver3860xEE 00-09 uapi/linux/pfrut.h Platform Firmware Runtime Update and Telemetry3870xF3 00-3F drivers/usb/misc/sisusbvga/sisusb.h sisfb (in development)388 <mailto:thomas@winischhofer.net>3890xF6 all LTTng Linux Trace Toolkit Next Generation390 <mailto:mathieu.desnoyers@efficios.com>3910xF8 all arch/x86/include/uapi/asm/amd_hsmp.h AMD HSMP EPYC system management interface driver392 <mailto:nchatrad@amd.com>3930xFD all linux/dm-ioctl.h3940xFE all linux/isst_if.h395==== ===== 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