Gitiles
Code Review Sign In
192.168.1.100 / T103 / 1f884588077ad3476b9c91cbb0ee9ee0332bbb68 / . / src / kernel / linux / v4.14 / Documentation / ioctl / ioctl-number.txt
blob: 3e3fdae5f3ed8ae19adbb669530919c07c140ad0 [file] [log] [blame]
rjw1f884582022-01-06 17:20:42 +0800[diff] [blame^]1Ioctl Numbers
219 October 1999
3Michael Elizabeth Chastain
4<mec@shout.net>
5
6If you are adding new ioctl's to the kernel, you should use the _IO
7macros defined in <linux/ioctl.h>:
8
9 _IO an ioctl with no parameters
10 _IOW an ioctl with write parameters (copy_from_user)
11 _IOR an ioctl with read parameters (copy_to_user)
12 _IOWR an ioctl with both write and read parameters.
13
14'Write' and 'read' are from the user's point of view, just like the
15system calls 'write' and 'read'. For example, a SET_FOO ioctl would
16be _IOW, although the kernel would actually read data from user space;
17a GET_FOO ioctl would be _IOR, although the kernel would actually write
18data to user space.
19
20The first argument to _IO, _IOW, _IOR, or _IOWR is an identifying letter
21or number from the table below. Because of the large number of drivers,
22many drivers share a partial letter with other drivers.
23
24If you are writing a driver for a new device and need a letter, pick an
25unused block with enough room for expansion: 32 to 256 ioctl commands.
26You can register the block by patching this file and submitting the
27patch to Linus Torvalds. Or you can e-mail me at <mec@shout.net> and
28I'll register one for you.
29
30The second argument to _IO, _IOW, _IOR, or _IOWR is a sequence number
31to distinguish ioctls from each other. The third argument to _IOW,
32_IOR, or _IOWR is the type of the data going into the kernel or coming
33out of the kernel (e.g. 'int' or 'struct foo'). NOTE! Do NOT use
34sizeof(arg) as the third argument as this results in your ioctl thinking
35it passes an argument of type size_t.
36
37Some devices use their major number as the identifier; this is OK, as
38long as it is unique. Some devices are irregular and don't follow any
39convention at all.
40
41Following this convention is good because:
42
43(1) Keeping the ioctl's globally unique helps error checking:
44 if a program calls an ioctl on the wrong device, it will get an
45 error rather than some unexpected behaviour.
46
47(2) The 'strace' build procedure automatically finds ioctl numbers
48 defined with _IO, _IOW, _IOR, or _IOWR.
49
50(3) 'strace' can decode numbers back into useful names when the
51 numbers are unique.
52
53(4) People looking for ioctls can grep for them more easily when
54 this convention is used to define the ioctl numbers.
55
56(5) When following the convention, the driver code can use generic
57 code to copy the parameters between user and kernel space.
58
59This table lists ioctls visible from user land for Linux/x86. It contains
60most drivers up to 2.6.31, but I know I am missing some. There has been
61no attempt to list non-X86 architectures or ioctls from drivers/staging/.
62
63Code Seq#(hex) Include File Comments
64========================================================
650x00 00-1F linux/fs.h conflict!
660x00 00-1F scsi/scsi_ioctl.h conflict!
670x00 00-1F linux/fb.h conflict!
680x00 00-1F linux/wavefront.h conflict!
690x02 all linux/fd.h
700x03 all linux/hdreg.h
710x04 D2-DC linux/umsdos_fs.h Dead since 2.6.11, but don't reuse these.
720x06 all linux/lp.h
730x09 all linux/raid/md_u.h
740x10 00-0F drivers/char/s390/vmcp.h
750x10 10-1F arch/s390/include/uapi/sclp_ctl.h
760x10 20-2F arch/s390/include/uapi/asm/hypfs.h
770x12 all linux/fs.h
78 linux/blkpg.h
790x1b all InfiniBand Subsystem <http://infiniband.sourceforge.net/>
800x20 all drivers/cdrom/cm206.h
810x22 all scsi/sg.h
82'#' 00-3F IEEE 1394 Subsystem Block for the entire subsystem
83'$' 00-0F linux/perf_counter.h, linux/perf_event.h
84'%' 00-0F include/uapi/linux/stm.h
85 System Trace Module subsystem
86 <mailto:alexander.shishkin@linux.intel.com>
87'&' 00-07 drivers/firewire/nosy-user.h
88'1' 00-1F <linux/timepps.h> PPS kit from Ulrich Windl
89 <ftp://ftp.de.kernel.org/pub/linux/daemons/ntp/PPS/>
90'2' 01-04 linux/i2o.h
91'3' 00-0F drivers/s390/char/raw3270.h conflict!
92'3' 00-1F linux/suspend_ioctls.h conflict!
93 and kernel/power/user.c
94'8' all SNP8023 advanced NIC card
95 <mailto:mcr@solidum.com>
96';' 64-7F linux/vfio.h
97'@' 00-0F linux/radeonfb.h conflict!
98'@' 00-0F drivers/video/aty/aty128fb.c conflict!
99'A' 00-1F linux/apm_bios.h conflict!
100'A' 00-0F linux/agpgart.h conflict!
101 and drivers/char/agp/compat_ioctl.h
102'A' 00-7F sound/asound.h conflict!
103'B' 00-1F linux/cciss_ioctl.h conflict!
104'B' 00-0F include/linux/pmu.h conflict!
105'B' C0-FF advanced bbus
106 <mailto:maassen@uni-freiburg.de>
107'C' all linux/soundcard.h conflict!
108'C' 01-2F linux/capi.h conflict!
109'C' F0-FF drivers/net/wan/cosa.h conflict!
110'D' all arch/s390/include/asm/dasd.h
111'D' 40-5F drivers/scsi/dpt/dtpi_ioctl.h
112'D' 05 drivers/scsi/pmcraid.h
113'E' all linux/input.h conflict!
114'E' 00-0F xen/evtchn.h conflict!
115'F' all linux/fb.h conflict!
116'F' 01-02 drivers/scsi/pmcraid.h conflict!
117'F' 20 drivers/video/fsl-diu-fb.h conflict!
118'F' 20 drivers/video/intelfb/intelfb.h conflict!
119'F' 20 linux/ivtvfb.h conflict!
120'F' 20 linux/matroxfb.h conflict!
121'F' 20 drivers/video/aty/atyfb_base.c conflict!
122'F' 00-0F video/da8xx-fb.h conflict!
123'F' 80-8F linux/arcfb.h conflict!
124'F' DD video/sstfb.h conflict!
125'G' 00-3F drivers/misc/sgi-gru/grulib.h conflict!
126'G' 00-0F linux/gigaset_dev.h conflict!
127'H' 00-7F linux/hiddev.h conflict!
128'H' 00-0F linux/hidraw.h conflict!
129'H' 01 linux/mei.h conflict!
130'H' 02 linux/mei.h conflict!
131'H' 03 linux/mei.h conflict!
132'H' 00-0F sound/asound.h conflict!
133'H' 20-40 sound/asound_fm.h conflict!
134'H' 80-8F sound/sfnt_info.h conflict!
135'H' 10-8F sound/emu10k1.h conflict!
136'H' 10-1F sound/sb16_csp.h conflict!
137'H' 10-1F sound/hda_hwdep.h conflict!
138'H' 40-4F sound/hdspm.h conflict!
139'H' 40-4F sound/hdsp.h conflict!
140'H' 90 sound/usb/usx2y/usb_stream.h
141'H' A0 uapi/linux/usb/cdc-wdm.h
142'H' C0-F0 net/bluetooth/hci.h conflict!
143'H' C0-DF net/bluetooth/hidp/hidp.h conflict!
144'H' C0-DF net/bluetooth/cmtp/cmtp.h conflict!
145'H' C0-DF net/bluetooth/bnep/bnep.h conflict!
146'H' F1 linux/hid-roccat.h <mailto:erazor_de@users.sourceforge.net>
147'H' F8-FA sound/firewire.h
148'I' all linux/isdn.h conflict!
149'I' 00-0F drivers/isdn/divert/isdn_divert.h conflict!
150'I' 40-4F linux/mISDNif.h conflict!
151'J' 00-1F drivers/scsi/gdth_ioctl.h
152'K' all linux/kd.h
153'L' 00-1F linux/loop.h conflict!
154'L' 10-1F drivers/scsi/mpt2sas/mpt2sas_ctl.h conflict!
155'L' 20-2F linux/lightnvm.h
156'L' E0-FF linux/ppdd.h encrypted disk device driver
157 <http://linux01.gwdg.de/~alatham/ppdd.html>
158'M' all linux/soundcard.h conflict!
159'M' 01-16 mtd/mtd-abi.h conflict!
160 and drivers/mtd/mtdchar.c
161'M' 01-03 drivers/scsi/megaraid/megaraid_sas.h
162'M' 00-0F drivers/video/fsl-diu-fb.h conflict!
163'N' 00-1F drivers/usb/scanner.h
164'N' 40-7F drivers/block/nvme.c
165'O' 00-06 mtd/ubi-user.h UBI
166'P' all linux/soundcard.h conflict!
167'P' 60-6F sound/sscape_ioctl.h conflict!
168'P' 00-0F drivers/usb/class/usblp.c conflict!
169'Q' all linux/soundcard.h
170'R' 00-1F linux/random.h conflict!
171'R' 01 linux/rfkill.h conflict!
172'R' C0-DF net/bluetooth/rfcomm.h
173'S' all linux/cdrom.h conflict!
174'S' 80-81 scsi/scsi_ioctl.h conflict!
175'S' 82-FF scsi/scsi.h conflict!
176'S' 00-7F sound/asequencer.h conflict!
177'T' all linux/soundcard.h conflict!
178'T' 00-AF sound/asound.h conflict!
179'T' all arch/x86/include/asm/ioctls.h conflict!
180'T' C0-DF linux/if_tun.h conflict!
181'U' all sound/asound.h conflict!
182'U' 00-CF linux/uinput.h conflict!
183'U' 00-EF linux/usbdevice_fs.h
184'U' C0-CF drivers/bluetooth/hci_uart.h
185'V' all linux/vt.h conflict!
186'V' all linux/videodev2.h conflict!
187'V' C0 linux/ivtvfb.h conflict!
188'V' C0 linux/ivtv.h conflict!
189'V' C0 media/davinci/vpfe_capture.h conflict!
190'V' C0 media/si4713.h conflict!
191'W' 00-1F linux/watchdog.h conflict!
192'W' 00-1F linux/wanrouter.h conflict! (pre 3.9)
193'W' 00-3F sound/asound.h conflict!
194'W' 40-5F drivers/pci/switch/switchtec.c
195'X' all fs/xfs/xfs_fs.h conflict!
196 and fs/xfs/linux-2.6/xfs_ioctl32.h
197 and include/linux/falloc.h
198 and linux/fs.h
199'X' all fs/ocfs2/ocfs_fs.h conflict!
200'X' 01 linux/pktcdvd.h conflict!
201'Y' all linux/cyclades.h
202'Z' 14-15 drivers/message/fusion/mptctl.h
203'[' 00-07 linux/usb/tmc.h USB Test and Measurement Devices
204 <mailto:gregkh@linuxfoundation.org>
205'a' all linux/atm*.h, linux/sonet.h ATM on linux
206 <http://lrcwww.epfl.ch/>
207'a' 00-0F drivers/crypto/qat/qat_common/adf_cfg_common.h conflict! qat driver
208'b' 00-FF conflict! bit3 vme host bridge
209 <mailto:natalia@nikhefk.nikhef.nl>
210'c' all linux/cm4000_cs.h conflict!
211'c' 00-7F linux/comstats.h conflict!
212'c' 00-7F linux/coda.h conflict!
213'c' 00-1F linux/chio.h conflict!
214'c' 80-9F arch/s390/include/asm/chsc.h conflict!
215'c' A0-AF arch/x86/include/asm/msr.h conflict!
216'd' 00-FF linux/char/drm/drm.h conflict!
217'd' 02-40 pcmcia/ds.h conflict!
218'd' F0-FF linux/digi1.h
219'e' all linux/digi1.h conflict!
220'e' 00-1F drivers/net/irda/irtty-sir.h conflict!
221'f' 00-1F linux/ext2_fs.h conflict!
222'f' 00-1F linux/ext3_fs.h conflict!
223'f' 00-0F fs/jfs/jfs_dinode.h conflict!
224'f' 00-0F fs/ext4/ext4.h conflict!
225'f' 00-0F linux/fs.h conflict!
226'f' 00-0F fs/ocfs2/ocfs2_fs.h conflict!
227'g' 00-0F linux/usb/gadgetfs.h
228'g' 20-2F linux/usb/g_printer.h
229'h' 00-7F conflict! Charon filesystem
230 <mailto:zapman@interlan.net>
231'h' 00-1F linux/hpet.h conflict!
232'h' 80-8F fs/hfsplus/ioctl.c
233'i' 00-3F linux/i2o-dev.h conflict!
234'i' 0B-1F linux/ipmi.h conflict!
235'i' 80-8F linux/i8k.h
236'j' 00-3F linux/joystick.h
237'k' 00-0F linux/spi/spidev.h conflict!
238'k' 00-05 video/kyro.h conflict!
239'k' 10-17 linux/hsi/hsi_char.h HSI character device
240'l' 00-3F linux/tcfs_fs.h transparent cryptographic file system
241 <http://web.archive.org/web/*/http://mikonos.dia.unisa.it/tcfs>
242'l' 40-7F linux/udf_fs_i.h in development:
243 <http://sourceforge.net/projects/linux-udf/>
244'm' 00-09 linux/mmtimer.h conflict!
245'm' all linux/mtio.h conflict!
246'm' all linux/soundcard.h conflict!
247'm' all linux/synclink.h conflict!
248'm' 00-19 drivers/message/fusion/mptctl.h conflict!
249'm' 00 drivers/scsi/megaraid/megaraid_ioctl.h conflict!
250'm' 00-1F net/irda/irmod.h conflict!
251'n' 00-7F linux/ncp_fs.h and fs/ncpfs/ioctl.c
252'n' 80-8F uapi/linux/nilfs2_api.h NILFS2
253'n' E0-FF linux/matroxfb.h matroxfb
254'o' 00-1F fs/ocfs2/ocfs2_fs.h OCFS2
255'o' 00-03 mtd/ubi-user.h conflict! (OCFS2 and UBI overlaps)
256'o' 40-41 mtd/ubi-user.h UBI
257'o' 01-A1 linux/dvb/*.h DVB
258'p' 00-0F linux/phantom.h conflict! (OpenHaptics needs this)
259'p' 00-1F linux/rtc.h conflict!
260'p' 00-3F linux/mc146818rtc.h conflict!
261'p' 40-7F linux/nvram.h
262'p' 80-9F linux/ppdev.h user-space parport
263 <mailto:tim@cyberelk.net>
264'p' A1-A5 linux/pps.h LinuxPPS
265 <mailto:giometti@linux.it>
266'q' 00-1F linux/serio.h
267'q' 80-FF linux/telephony.h Internet PhoneJACK, Internet LineJACK
268 linux/ixjuser.h <http://web.archive.org/web/*/http://www.quicknet.net>
269'r' 00-1F linux/msdos_fs.h and fs/fat/dir.c
270's' all linux/cdk.h
271't' 00-7F linux/ppp-ioctl.h
272't' 80-8F linux/isdn_ppp.h
273't' 90-91 linux/toshiba.h toshiba and toshiba_acpi SMM
274'u' 00-1F linux/smb_fs.h gone
275'u' 20-3F linux/uvcvideo.h USB video class host driver
276'v' 00-1F linux/ext2_fs.h conflict!
277'v' 00-1F linux/fs.h conflict!
278'v' 00-0F linux/sonypi.h conflict!
279'v' C0-FF linux/meye.h conflict!
280'w' all CERN SCI driver
281'y' 00-1F packet based user level communications
282 <mailto:zapman@interlan.net>
283'z' 00-3F CAN bus card conflict!
284 <mailto:hdstich@connectu.ulm.circular.de>
285'z' 40-7F CAN bus card conflict!
286 <mailto:oe@port.de>
287'z' 10-4F drivers/s390/crypto/zcrypt_api.h conflict!
288'|' 00-7F linux/media.h
2890x80 00-1F linux/fb.h
2900x89 00-06 arch/x86/include/asm/sockios.h
2910x89 0B-DF linux/sockios.h
2920x89 E0-EF linux/sockios.h SIOCPROTOPRIVATE range
2930x89 E0-EF linux/dn.h PROTOPRIVATE range
2940x89 F0-FF linux/sockios.h SIOCDEVPRIVATE range
2950x8B all linux/wireless.h
2960x8C 00-3F WiNRADiO driver
297 <http://www.winradio.com.au/>
2980x90 00 drivers/cdrom/sbpcd.h
2990x92 00-0F drivers/usb/mon/mon_bin.c
3000x93 60-7F linux/auto_fs.h
3010x94 all fs/btrfs/ioctl.h
3020x97 00-7F fs/ceph/ioctl.h Ceph file system
3030x99 00-0F 537-Addinboard driver
304 <mailto:buk@buks.ipn.de>
3050xA0 all linux/sdp/sdp.h Industrial Device Project
306 <mailto:kenji@bitgate.com>
3070xA1 0 linux/vtpm_proxy.h TPM Emulator Proxy Driver
3080xA2 00-0F arch/tile/include/asm/hardwall.h
3090xA3 80-8F Port ACL in development:
310 <mailto:tlewis@mindspring.com>
3110xA3 90-9F linux/dtlk.h
3120xA4 00-1F uapi/linux/tee.h Generic TEE subsystem
3130xAA 00-3F linux/uapi/linux/userfaultfd.h
3140xAB 00-1F linux/nbd.h
3150xAC 00-1F linux/raw.h
3160xAD 00 Netfilter device in development:
317 <mailto:rusty@rustcorp.com.au>
3180xAE all linux/kvm.h Kernel-based Virtual Machine
319 <mailto:kvm@vger.kernel.org>
3200xAF 00-1F linux/fsl_hypervisor.h Freescale hypervisor
3210xB0 all RATIO devices in development:
322 <mailto:vgo@ratio.de>
3230xB1 00-1F PPPoX <mailto:mostrows@styx.uwaterloo.ca>
3240xB3 00 linux/mmc/ioctl.h
3250xB4 00-0F linux/gpio.h <mailto:linux-gpio@vger.kernel.org>
3260xB5 00-0F uapi/linux/rpmsg.h <mailto:linux-remoteproc@vger.kernel.org>
3270xC0 00-0F linux/usb/iowarrior.h
3280xCA 00-0F uapi/misc/cxl.h
3290xCA 80-BF uapi/scsi/cxlflash_ioctl.h
3300xCB 00-1F CBM serial IEC bus in development:
331 <mailto:michael.klein@puffin.lb.shuttle.de>
3320xCD 01 linux/reiserfs_fs.h
3330xCF 02 fs/cifs/ioctl.c
3340xDB 00-0F drivers/char/mwave/mwavepub.h
3350xDD 00-3F ZFCP device driver see drivers/s390/scsi/
336 <mailto:aherrman@de.ibm.com>
3370xE5 00-3F linux/fuse.h
3380xEC 00-01 drivers/platform/chrome/cros_ec_dev.h ChromeOS EC driver
3390xF3 00-3F drivers/usb/misc/sisusbvga/sisusb.h sisfb (in development)
340 <mailto:thomas@winischhofer.net>
3410xF4 00-1F video/mbxfb.h mbxfb
342 <mailto:raph@8d.com>
3430xF6 all LTTng Linux Trace Toolkit Next Generation
344 <mailto:mathieu.desnoyers@efficios.com>
3450xFD all linux/dm-ioctl.h