Gitiles
Code Review Sign In
review.shift-gmbh.com / SHIFTPHONES / mainline / linux / c127161865bc21a3fc6adad07b38ce8276ba2f8e / . / Documentation / userspace-api / ioctl / ioctl-number.rst
blob: 96b2ae9f277f2ed2056c2f56db9f0166f8ca3469 [file] [log] [blame]
Mauro Carvalho Chehab08536102019-04-18 11:21:26 -0300[diff] [blame]1=============
2Ioctl Numbers
3=============
4
519 October 1999
6
7Michael Elizabeth Chastain
8<mec@shout.net>
9
10If you are adding new ioctl's to the kernel, you should use the _IO
11macros defined in <linux/ioctl.h>:
12
13 ====== == ============================================
14 _IO an ioctl with no parameters
15 _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 the
21system calls 'write' and 'read'. For example, a SET_FOO ioctl would
22be _IOW, although the kernel would actually read data from user space;
23a GET_FOO ioctl would be _IOR, although the kernel would actually write
24data to user space.
25
26The first argument to _IO, _IOW, _IOR, or _IOWR is an identifying letter
27or 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 an
31unused block with enough room for expansion: 32 to 256 ioctl commands.
32You can register the block by patching this file and submitting the
33patch to Linus Torvalds. Or you can e-mail me at <mec@shout.net> and
34I'll register one for you.
35
36The second argument to _IO, _IOW, _IOR, or _IOWR is a sequence number
37to 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 coming
39out of the kernel (e.g. 'int' or 'struct foo'). NOTE! Do NOT use
40sizeof(arg) as the third argument as this results in your ioctl thinking
41it passes an argument of type size_t.
42
43Some devices use their major number as the identifier; this is OK, as
44long as it is unique. Some devices are irregular and don't follow any
45convention 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 an
51 error rather than some unexpected behaviour.
52
53(2) The 'strace' build procedure automatically finds ioctl numbers
54 defined with _IO, _IOW, _IOR, or _IOWR.
55
56(3) 'strace' can decode numbers back into useful names when the
57 numbers are unique.
58
59(4) People looking for ioctls can grep for them more easily when
60 this convention is used to define the ioctl numbers.
61
62(5) When following the convention, the driver code can use generic
63 code to copy the parameters between user and kernel space.
64
65This table lists ioctls visible from user land for Linux/x86. It contains
66most drivers up to 2.6.31, but I know I am missing some. There has been
67no attempt to list non-X86 architectures or ioctls from drivers/staging/.
68
69==== ===== ======================================================= ================================================================
70Code Seq# Include File Comments
71 (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.h
780x03 all linux/hdreg.h
790x04 D2-DC linux/umsdos_fs.h Dead since 2.6.11, but don't reuse these.
800x06 all linux/lp.h
810x09 all linux/raid/md_u.h
820x10 00-0F drivers/char/s390/vmcp.h
830x10 10-1F arch/s390/include/uapi/sclp_ctl.h
840x10 20-2F arch/s390/include/uapi/asm/hypfs.h
850x12 all linux/fs.h
86 linux/blkpg.h
870x1b all InfiniBand Subsystem
88 <http://infiniband.sourceforge.net/>
890x20 all drivers/cdrom/cm206.h
900x22 all scsi/sg.h
91'!' 00-1F uapi/linux/seccomp.h
92'#' 00-3F IEEE 1394 Subsystem
93 Block for the entire subsystem
94'$' 00-0F linux/perf_counter.h, linux/perf_event.h
95'%' 00-0F include/uapi/linux/stm.h System Trace Module subsystem
96 <mailto:alexander.shishkin@linux.intel.com>
97'&' 00-07 drivers/firewire/nosy-user.h
98'1' 00-1F linux/timepps.h PPS kit from Ulrich Windl
99 <ftp://ftp.de.kernel.org/pub/linux/daemons/ntp/PPS/>
100'2' 01-04 linux/i2o.h
101'3' 00-0F drivers/s390/char/raw3270.h conflict!
102'3' 00-1F linux/suspend_ioctls.h, conflict!
103 kernel/power/user.c
104'8' all SNP8023 advanced NIC card
105 <mailto:mcr@solidum.com>
106';' 64-7F linux/vfio.h
107'@' 00-0F linux/radeonfb.h conflict!
108'@' 00-0F drivers/video/aty/aty128fb.c conflict!
109'A' 00-1F linux/apm_bios.h conflict!
110'A' 00-0F linux/agpgart.h, conflict!
111 drivers/char/agp/compat_ioctl.h
112'A' 00-7F sound/asound.h conflict!
113'B' 00-1F linux/cciss_ioctl.h conflict!
114'B' 00-0F include/linux/pmu.h conflict!
115'B' C0-FF advanced bbus <mailto:maassen@uni-freiburg.de>
116'C' all linux/soundcard.h conflict!
117'C' 01-2F linux/capi.h conflict!
118'C' F0-FF drivers/net/wan/cosa.h conflict!
119'D' all arch/s390/include/asm/dasd.h
120'D' 40-5F drivers/scsi/dpt/dtpi_ioctl.h
121'D' 05 drivers/scsi/pmcraid.h
122'E' all linux/input.h conflict!
123'E' 00-0F xen/evtchn.h conflict!
124'F' all linux/fb.h conflict!
125'F' 01-02 drivers/scsi/pmcraid.h conflict!
126'F' 20 drivers/video/fsl-diu-fb.h conflict!
127'F' 20 drivers/video/intelfb/intelfb.h conflict!
128'F' 20 linux/ivtvfb.h conflict!
129'F' 20 linux/matroxfb.h conflict!
130'F' 20 drivers/video/aty/atyfb_base.c conflict!
131'F' 00-0F video/da8xx-fb.h conflict!
132'F' 80-8F linux/arcfb.h conflict!
133'F' DD video/sstfb.h conflict!
134'G' 00-3F drivers/misc/sgi-gru/grulib.h conflict!
Mauro Carvalho Chehab08536102019-04-18 11:21:26 -0300[diff] [blame]135'H' 00-7F linux/hiddev.h conflict!
136'H' 00-0F linux/hidraw.h conflict!
137'H' 01 linux/mei.h conflict!
138'H' 02 linux/mei.h conflict!
139'H' 03 linux/mei.h conflict!
140'H' 00-0F sound/asound.h conflict!
141'H' 20-40 sound/asound_fm.h conflict!
142'H' 80-8F sound/sfnt_info.h conflict!
143'H' 10-8F sound/emu10k1.h conflict!
144'H' 10-1F sound/sb16_csp.h conflict!
145'H' 10-1F sound/hda_hwdep.h conflict!
146'H' 40-4F sound/hdspm.h conflict!
147'H' 40-4F sound/hdsp.h conflict!
148'H' 90 sound/usb/usx2y/usb_stream.h
Oded Gabbayd8e8ff12020-04-18 20:41:32 +0300[diff] [blame]149'H' 00-0F uapi/misc/habanalabs.h conflict!
Mauro Carvalho Chehab08536102019-04-18 11:21:26 -0300[diff] [blame]150'H' A0 uapi/linux/usb/cdc-wdm.h
151'H' C0-F0 net/bluetooth/hci.h conflict!
152'H' C0-DF net/bluetooth/hidp/hidp.h conflict!
153'H' C0-DF net/bluetooth/cmtp/cmtp.h conflict!
154'H' C0-DF net/bluetooth/bnep/bnep.h conflict!
155'H' F1 linux/hid-roccat.h <mailto:erazor_de@users.sourceforge.net>
156'H' F8-FA sound/firewire.h
157'I' all linux/isdn.h conflict!
158'I' 00-0F drivers/isdn/divert/isdn_divert.h conflict!
159'I' 40-4F linux/mISDNif.h conflict!
Mauro Carvalho Chehab08536102019-04-18 11:21:26 -0300[diff] [blame]160'K' all linux/kd.h
161'L' 00-1F linux/loop.h conflict!
162'L' 10-1F drivers/scsi/mpt3sas/mpt3sas_ctl.h conflict!
163'L' 20-2F linux/lightnvm.h
164'L' E0-FF linux/ppdd.h encrypted disk device driver
165 <http://linux01.gwdg.de/~alatham/ppdd.html>
166'M' all linux/soundcard.h conflict!
167'M' 01-16 mtd/mtd-abi.h conflict!
168 and drivers/mtd/mtdchar.c
169'M' 01-03 drivers/scsi/megaraid/megaraid_sas.h
170'M' 00-0F drivers/video/fsl-diu-fb.h conflict!
171'N' 00-1F drivers/usb/scanner.h
172'N' 40-7F drivers/block/nvme.c
173'O' 00-06 mtd/ubi-user.h UBI
174'P' all linux/soundcard.h conflict!
175'P' 60-6F sound/sscape_ioctl.h conflict!
176'P' 00-0F drivers/usb/class/usblp.c conflict!
177'P' 01-09 drivers/misc/pci_endpoint_test.c conflict!
178'Q' all linux/soundcard.h
179'R' 00-1F linux/random.h conflict!
180'R' 01 linux/rfkill.h conflict!
181'R' C0-DF net/bluetooth/rfcomm.h
Ioana Ciornei2cf1e702021-01-14 19:07:50 +0200[diff] [blame]182'R' E0 uapi/linux/fsl_mc.h
Mauro Carvalho Chehab08536102019-04-18 11:21:26 -0300[diff] [blame]183'S' all linux/cdrom.h conflict!
184'S' 80-81 scsi/scsi_ioctl.h conflict!
185'S' 82-FF scsi/scsi.h conflict!
186'S' 00-7F sound/asequencer.h conflict!
187'T' all linux/soundcard.h conflict!
188'T' 00-AF sound/asound.h conflict!
189'T' all arch/x86/include/asm/ioctls.h conflict!
190'T' C0-DF linux/if_tun.h conflict!
191'U' all sound/asound.h conflict!
192'U' 00-CF linux/uinput.h conflict!
193'U' 00-EF linux/usbdevice_fs.h
194'U' C0-CF drivers/bluetooth/hci_uart.h
195'V' all linux/vt.h conflict!
196'V' all linux/videodev2.h conflict!
197'V' C0 linux/ivtvfb.h conflict!
198'V' C0 linux/ivtv.h conflict!
199'V' C0 media/davinci/vpfe_capture.h conflict!
200'V' C0 media/si4713.h conflict!
201'W' 00-1F linux/watchdog.h conflict!
202'W' 00-1F linux/wanrouter.h conflict! (pre 3.9)
203'W' 00-3F sound/asound.h conflict!
204'W' 40-5F drivers/pci/switch/switchtec.c
David Howellsc73be612020-01-14 17:07:11 +0000[diff] [blame]205'W' 60-61 linux/watch_queue.h
Mauro Carvalho Chehab08536102019-04-18 11:21:26 -0300[diff] [blame]206'X' all fs/xfs/xfs_fs.h, conflict!
207 fs/xfs/linux-2.6/xfs_ioctl32.h,
208 include/linux/falloc.h,
209 linux/fs.h,
210'X' all fs/ocfs2/ocfs_fs.h conflict!
211'X' 01 linux/pktcdvd.h conflict!
212'Y' all linux/cyclades.h
213'Z' 14-15 drivers/message/fusion/mptctl.h
214'[' 00-3F linux/usb/tmc.h USB Test and Measurement Devices
215 <mailto:gregkh@linuxfoundation.org>
216'a' all linux/atm*.h, linux/sonet.h ATM on linux
217 <http://lrcwww.epfl.ch/>
218'a' 00-0F drivers/crypto/qat/qat_common/adf_cfg_common.h conflict! qat driver
219'b' 00-FF conflict! bit3 vme host bridge
220 <mailto:natalia@nikhefk.nikhef.nl>
221'c' all linux/cm4000_cs.h conflict!
222'c' 00-7F linux/comstats.h conflict!
223'c' 00-7F linux/coda.h conflict!
224'c' 00-1F linux/chio.h conflict!
225'c' 80-9F arch/s390/include/asm/chsc.h conflict!
226'c' A0-AF arch/x86/include/asm/msr.h conflict!
227'd' 00-FF linux/char/drm/drm.h conflict!
228'd' 02-40 pcmcia/ds.h conflict!
229'd' F0-FF linux/digi1.h
230'e' all linux/digi1.h conflict!
231'f' 00-1F linux/ext2_fs.h conflict!
232'f' 00-1F linux/ext3_fs.h conflict!
233'f' 00-0F fs/jfs/jfs_dinode.h conflict!
234'f' 00-0F fs/ext4/ext4.h conflict!
235'f' 00-0F linux/fs.h conflict!
236'f' 00-0F fs/ocfs2/ocfs2_fs.h conflict!
Eric Biggers065ab4c2019-10-09 16:34:18 -0700[diff] [blame]237'f' 13-27 linux/fscrypt.h
Eric Biggers085771e2019-07-22 09:26:20 -0700[diff] [blame]238'f' 81-8F linux/fsverity.h
Mauro Carvalho Chehab08536102019-04-18 11:21:26 -0300[diff] [blame]239'g' 00-0F linux/usb/gadgetfs.h
240'g' 20-2F linux/usb/g_printer.h
241'h' 00-7F conflict! Charon filesystem
242 <mailto:zapman@interlan.net>
243'h' 00-1F linux/hpet.h conflict!
244'h' 80-8F fs/hfsplus/ioctl.c
245'i' 00-3F linux/i2o-dev.h conflict!
246'i' 0B-1F linux/ipmi.h conflict!
247'i' 80-8F linux/i8k.h
Alexandru Ardeleanc1271612021-02-15 12:40:26 +0200[diff] [blame^]248'i' 90-9F `linux/iio/*.h` IIO
Mauro Carvalho Chehab08536102019-04-18 11:21:26 -0300[diff] [blame]249'j' 00-3F linux/joystick.h
250'k' 00-0F linux/spi/spidev.h conflict!
251'k' 00-05 video/kyro.h conflict!
252'k' 10-17 linux/hsi/hsi_char.h HSI character device
253'l' 00-3F linux/tcfs_fs.h transparent cryptographic file system
254 <http://web.archive.org/web/%2A/http://mikonos.dia.unisa.it/tcfs>
255'l' 40-7F linux/udf_fs_i.h in development:
256 <http://sourceforge.net/projects/linux-udf/>
257'm' 00-09 linux/mmtimer.h conflict!
258'm' all linux/mtio.h conflict!
259'm' all linux/soundcard.h conflict!
260'm' all linux/synclink.h conflict!
261'm' 00-19 drivers/message/fusion/mptctl.h conflict!
262'm' 00 drivers/scsi/megaraid/megaraid_ioctl.h conflict!
263'n' 00-7F linux/ncp_fs.h and fs/ncpfs/ioctl.c
264'n' 80-8F uapi/linux/nilfs2_api.h NILFS2
265'n' E0-FF linux/matroxfb.h matroxfb
266'o' 00-1F fs/ocfs2/ocfs2_fs.h OCFS2
267'o' 00-03 mtd/ubi-user.h conflict! (OCFS2 and UBI overlaps)
268'o' 40-41 mtd/ubi-user.h UBI
269'o' 01-A1 `linux/dvb/*.h` DVB
270'p' 00-0F linux/phantom.h conflict! (OpenHaptics needs this)
271'p' 00-1F linux/rtc.h conflict!
Mauro Carvalho Chehab08536102019-04-18 11:21:26 -0300[diff] [blame]272'p' 40-7F linux/nvram.h
273'p' 80-9F linux/ppdev.h user-space parport
274 <mailto:tim@cyberelk.net>
275'p' A1-A5 linux/pps.h LinuxPPS
276 <mailto:giometti@linux.it>
277'q' 00-1F linux/serio.h
278'q' 80-FF linux/telephony.h Internet PhoneJACK, Internet LineJACK
279 linux/ixjuser.h <http://web.archive.org/web/%2A/http://www.quicknet.net>
280'r' 00-1F linux/msdos_fs.h and fs/fat/dir.c
281's' all linux/cdk.h
282't' 00-7F linux/ppp-ioctl.h
283't' 80-8F linux/isdn_ppp.h
284't' 90-91 linux/toshiba.h toshiba and toshiba_acpi SMM
285'u' 00-1F linux/smb_fs.h gone
286'u' 20-3F linux/uvcvideo.h USB video class host driver
287'u' 40-4f linux/udmabuf.h userspace dma-buf misc device
288'v' 00-1F linux/ext2_fs.h conflict!
289'v' 00-1F linux/fs.h conflict!
290'v' 00-0F linux/sonypi.h conflict!
291'v' 00-0F media/v4l2-subdev.h conflict!
Haren Myneni45f25a72020-04-17 02:01:05 -0700[diff] [blame]292'v' 20-27 arch/powerpc/include/uapi/asm/vas-api.h VAS API
Mauro Carvalho Chehab08536102019-04-18 11:21:26 -0300[diff] [blame]293'v' C0-FF linux/meye.h conflict!
294'w' all CERN SCI driver
295'y' 00-1F packet based user level communications
296 <mailto:zapman@interlan.net>
297'z' 00-3F CAN bus card conflict!
298 <mailto:hdstich@connectu.ulm.circular.de>
299'z' 40-7F CAN bus card conflict!
300 <mailto:oe@port.de>
301'z' 10-4F drivers/s390/crypto/zcrypt_api.h conflict!
302'|' 00-7F linux/media.h
3030x80 00-1F linux/fb.h
3040x89 00-06 arch/x86/include/asm/sockios.h
3050x89 0B-DF linux/sockios.h
3060x89 E0-EF linux/sockios.h SIOCPROTOPRIVATE range
3070x89 E0-EF linux/dn.h PROTOPRIVATE range
3080x89 F0-FF linux/sockios.h SIOCDEVPRIVATE range
3090x8B all linux/wireless.h
3100x8C 00-3F WiNRADiO driver
311 <http://www.winradio.com.au/>
3120x90 00 drivers/cdrom/sbpcd.h
3130x92 00-0F drivers/usb/mon/mon_bin.c
3140x93 60-7F linux/auto_fs.h
3150x94 all fs/btrfs/ioctl.h Btrfs filesystem
316 and linux/fs.h some lifted to vfs/generic
3170x97 00-7F fs/ceph/ioctl.h Ceph file system
3180x99 00-0F 537-Addinboard driver
319 <mailto:buk@buks.ipn.de>
3200xA0 all linux/sdp/sdp.h Industrial Device Project
321 <mailto:kenji@bitgate.com>
3220xA1 0 linux/vtpm_proxy.h TPM Emulator Proxy Driver
Shuo Liu9c5137a2021-02-07 11:10:28 +0800[diff] [blame]3230xA2 all uapi/linux/acrn.h ACRN hypervisor
Mauro Carvalho Chehab08536102019-04-18 11:21:26 -0300[diff] [blame]3240xA3 80-8F Port ACL in development:
325 <mailto:tlewis@mindspring.com>
3260xA3 90-9F linux/dtlk.h
3270xA4 00-1F uapi/linux/tee.h Generic TEE subsystem
Jarkko Sakkinen888d2492020-11-13 00:01:23 +0200[diff] [blame]3280xA4 00-1F uapi/asm/sgx.h <mailto:linux-sgx@vger.kernel.org>
Maximilian Luz178f6ab2020-12-21 19:39:58 +0100[diff] [blame]3290xA5 01 linux/surface_aggregator/cdev.h Microsoft Surface Platform System Aggregator
330 <mailto:luzmaximilian@gmail.com>
Mauro Carvalho Chehab08536102019-04-18 11:21:26 -0300[diff] [blame]3310xAA 00-3F linux/uapi/linux/userfaultfd.h
3320xAB 00-1F linux/nbd.h
3330xAC 00-1F linux/raw.h
3340xAD 00 Netfilter device in development:
335 <mailto:rusty@rustcorp.com.au>
Andra Paraschiv15b760c2020-09-21 15:17:15 +0300[diff] [blame]3360xAE 00-1F linux/kvm.h Kernel-based Virtual Machine
Mauro Carvalho Chehab08536102019-04-18 11:21:26 -0300[diff] [blame]337 <mailto:kvm@vger.kernel.org>
Andra Paraschiv15b760c2020-09-21 15:17:15 +0300[diff] [blame]3380xAE 40-FF linux/kvm.h Kernel-based Virtual Machine
339 <mailto:kvm@vger.kernel.org>
3400xAE 20-3F linux/nitro_enclaves.h Nitro Enclaves
Mauro Carvalho Chehab08536102019-04-18 11:21:26 -0300[diff] [blame]3410xAF 00-1F linux/fsl_hypervisor.h Freescale hypervisor
3420xB0 all RATIO devices in development:
343 <mailto:vgo@ratio.de>
3440xB1 00-1F PPPoX
345 <mailto:mostrows@styx.uwaterloo.ca>
3460xB3 00 linux/mmc/ioctl.h
3470xB4 00-0F linux/gpio.h <mailto:linux-gpio@vger.kernel.org>
3480xB5 00-0F uapi/linux/rpmsg.h <mailto:linux-remoteproc@vger.kernel.org>
3490xB6 all linux/fpga-dfl.h
Siddharth Gupta44767702020-07-29 10:40:00 -0700[diff] [blame]3500xB7 all uapi/linux/remoteproc_cdev.h <mailto:linux-remoteproc@vger.kernel.org>
Mauro Carvalho Chehab08536102019-04-18 11:21:26 -0300[diff] [blame]3510xC0 00-0F linux/usb/iowarrior.h
3520xCA 00-0F uapi/misc/cxl.h
3530xCA 10-2F uapi/misc/ocxl.h
3540xCA 80-BF uapi/scsi/cxlflash_ioctl.h
3550xCB 00-1F CBM serial IEC bus in development:
356 <mailto:michael.klein@puffin.lb.shuttle.de>
3570xCC 00-0F drivers/misc/ibmvmc.h pseries VMC driver
3580xCD 01 linux/reiserfs_fs.h
Ben Widawsky583fa5e2021-02-16 20:09:53 -0800[diff] [blame]3590xCE 01-02 uapi/linux/cxl_mem.h Compute Express Link Memory Devices
Mauro Carvalho Chehab08536102019-04-18 11:21:26 -0300[diff] [blame]3600xCF 02 fs/cifs/ioctl.c
3610xDB 00-0F drivers/char/mwave/mwavepub.h
3620xDD 00-3F ZFCP device driver see drivers/s390/scsi/
363 <mailto:aherrman@de.ibm.com>
3640xE5 00-3F linux/fuse.h
3650xEC 00-01 drivers/platform/chrome/cros_ec_dev.h ChromeOS EC driver
3660xF3 00-3F drivers/usb/misc/sisusbvga/sisusb.h sisfb (in development)
367 <mailto:thomas@winischhofer.net>
Mauro Carvalho Chehab08536102019-04-18 11:21:26 -0300[diff] [blame]3680xF6 all LTTng Linux Trace Toolkit Next Generation
369 <mailto:mathieu.desnoyers@efficios.com>
3700xFD all linux/dm-ioctl.h
3710xFE all linux/isst_if.h
372==== ===== ======================================================= ================================================================