lightnvm: Support for Open-Channel SSDs
[linux-2.6-block.git] / Documentation / ioctl / ioctl-number.txt
CommitLineData
1da177e4
LT
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
cb5a8b2c
RD
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/.
1da177e4 62
cb5a8b2c 63Code Seq#(hex) Include File Comments
1da177e4
LT
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
d5298802 710x04 D2-DC linux/umsdos_fs.h Dead since 2.6.11, but don't reuse these.
1da177e4 720x06 all linux/lp.h
cb5a8b2c
RD
730x09 all linux/raid/md_u.h
740x10 00-0F drivers/char/s390/vmcp.h
d475f942 750x10 10-1F arch/s390/include/uapi/sclp_ctl.h
07be0382 760x10 20-2F arch/s390/include/uapi/asm/hypfs.h
1da177e4
LT
770x12 all linux/fs.h
78 linux/blkpg.h
0ea6e611 790x1b all InfiniBand Subsystem <http://infiniband.sourceforge.net/>
1da177e4
LT
800x20 all drivers/cdrom/cm206.h
810x22 all scsi/sg.h
82'#' 00-3F IEEE 1394 Subsystem Block for the entire subsystem
cb5a8b2c 83'$' 00-0F linux/perf_counter.h, linux/perf_event.h
aed69d2b 84'&' 00-07 drivers/firewire/nosy-user.h
1da177e4
LT
85'1' 00-1F <linux/timepps.h> PPS kit from Ulrich Windl
86 <ftp://ftp.de.kernel.org/pub/linux/daemons/ntp/PPS/>
cb5a8b2c
RD
87'2' 01-04 linux/i2o.h
88'3' 00-0F drivers/s390/char/raw3270.h conflict!
89'3' 00-1F linux/suspend_ioctls.h conflict!
90 and kernel/power/user.c
1da177e4
LT
91'8' all SNP8023 advanced NIC card
92 <mailto:mcr@solidum.com>
cba3345c 93';' 64-7F linux/vfio.h
cb5a8b2c
RD
94'@' 00-0F linux/radeonfb.h conflict!
95'@' 00-0F drivers/video/aty/aty128fb.c conflict!
96'A' 00-1F linux/apm_bios.h conflict!
97'A' 00-0F linux/agpgart.h conflict!
98 and drivers/char/agp/compat_ioctl.h
99'A' 00-7F sound/asound.h conflict!
100'B' 00-1F linux/cciss_ioctl.h conflict!
101'B' 00-0F include/linux/pmu.h conflict!
1da177e4
LT
102'B' C0-FF advanced bbus
103 <mailto:maassen@uni-freiburg.de>
cb5a8b2c
RD
104'C' all linux/soundcard.h conflict!
105'C' 01-2F linux/capi.h conflict!
106'C' F0-FF drivers/net/wan/cosa.h conflict!
07983f0e 107'D' all arch/s390/include/asm/dasd.h
cb5a8b2c
RD
108'D' 40-5F drivers/scsi/dpt/dtpi_ioctl.h
109'D' 05 drivers/scsi/pmcraid.h
110'E' all linux/input.h conflict!
111'E' 00-0F xen/evtchn.h conflict!
112'F' all linux/fb.h conflict!
113'F' 01-02 drivers/scsi/pmcraid.h conflict!
114'F' 20 drivers/video/fsl-diu-fb.h conflict!
115'F' 20 drivers/video/intelfb/intelfb.h conflict!
116'F' 20 linux/ivtvfb.h conflict!
117'F' 20 linux/matroxfb.h conflict!
118'F' 20 drivers/video/aty/atyfb_base.c conflict!
119'F' 00-0F video/da8xx-fb.h conflict!
120'F' 80-8F linux/arcfb.h conflict!
121'F' DD video/sstfb.h conflict!
122'G' 00-3F drivers/misc/sgi-gru/grulib.h conflict!
123'G' 00-0F linux/gigaset_dev.h conflict!
124'H' 00-7F linux/hiddev.h conflict!
125'H' 00-0F linux/hidraw.h conflict!
4cd7a7e7 126'H' 01 linux/mei.h conflict!
3c7c8468
TW
127'H' 02 linux/mei.h conflict!
128'H' 03 linux/mei.h conflict!
cb5a8b2c
RD
129'H' 00-0F sound/asound.h conflict!
130'H' 20-40 sound/asound_fm.h conflict!
131'H' 80-8F sound/sfnt_info.h conflict!
132'H' 10-8F sound/emu10k1.h conflict!
133'H' 10-1F sound/sb16_csp.h conflict!
134'H' 10-1F sound/hda_hwdep.h conflict!
135'H' 40-4F sound/hdspm.h conflict!
136'H' 40-4F sound/hdsp.h conflict!
137'H' 90 sound/usb/usx2y/usb_stream.h
3edce1cf 138'H' A0 uapi/linux/usb/cdc-wdm.h
cb5a8b2c
RD
139'H' C0-F0 net/bluetooth/hci.h conflict!
140'H' C0-DF net/bluetooth/hidp/hidp.h conflict!
141'H' C0-DF net/bluetooth/cmtp/cmtp.h conflict!
142'H' C0-DF net/bluetooth/bnep/bnep.h conflict!
5dc0c983 143'H' F1 linux/hid-roccat.h <mailto:erazor_de@users.sourceforge.net>
82fbb4f7 144'H' F8-FA sound/firewire.h
cb5a8b2c
RD
145'I' all linux/isdn.h conflict!
146'I' 00-0F drivers/isdn/divert/isdn_divert.h conflict!
147'I' 40-4F linux/mISDNif.h conflict!
1da177e4
LT
148'J' 00-1F drivers/scsi/gdth_ioctl.h
149'K' all linux/kd.h
cb5a8b2c
RD
150'L' 00-1F linux/loop.h conflict!
151'L' 10-1F drivers/scsi/mpt2sas/mpt2sas_ctl.h conflict!
cd9e9808 152'L' 20-2F linux/lightnvm.h
1da177e4
LT
153'L' E0-FF linux/ppdd.h encrypted disk device driver
154 <http://linux01.gwdg.de/~alatham/ppdd.html>
cb5a8b2c
RD
155'M' all linux/soundcard.h conflict!
156'M' 01-16 mtd/mtd-abi.h conflict!
157 and drivers/mtd/mtdchar.c
158'M' 01-03 drivers/scsi/megaraid/megaraid_sas.h
159'M' 00-0F drivers/video/fsl-diu-fb.h conflict!
1da177e4 160'N' 00-1F drivers/usb/scanner.h
b60503ba 161'N' 40-7F drivers/block/nvme.c
cb5a8b2c
RD
162'O' 00-06 mtd/ubi-user.h UBI
163'P' all linux/soundcard.h conflict!
164'P' 60-6F sound/sscape_ioctl.h conflict!
165'P' 00-0F drivers/usb/class/usblp.c conflict!
1da177e4 166'Q' all linux/soundcard.h
cb5a8b2c
RD
167'R' 00-1F linux/random.h conflict!
168'R' 01 linux/rfkill.h conflict!
cb5a8b2c 169'R' C0-DF net/bluetooth/rfcomm.h
1da177e4
LT
170'S' all linux/cdrom.h conflict!
171'S' 80-81 scsi/scsi_ioctl.h conflict!
172'S' 82-FF scsi/scsi.h conflict!
cb5a8b2c 173'S' 00-7F sound/asequencer.h conflict!
1da177e4 174'T' all linux/soundcard.h conflict!
cb5a8b2c 175'T' 00-AF sound/asound.h conflict!
07983f0e 176'T' all arch/x86/include/asm/ioctls.h conflict!
cb5a8b2c
RD
177'T' C0-DF linux/if_tun.h conflict!
178'U' all sound/asound.h conflict!
cb5a8b2c
RD
179'U' 00-CF linux/uinput.h conflict!
180'U' 00-EF linux/usbdevice_fs.h
181'U' C0-CF drivers/bluetooth/hci_uart.h
182'V' all linux/vt.h conflict!
183'V' all linux/videodev2.h conflict!
184'V' C0 linux/ivtvfb.h conflict!
185'V' C0 linux/ivtv.h conflict!
186'V' C0 media/davinci/vpfe_capture.h conflict!
187'V' C0 media/si4713.h conflict!
1da177e4 188'W' 00-1F linux/watchdog.h conflict!
a786a7c0 189'W' 00-1F linux/wanrouter.h conflict! (pre 3.9)
cb5a8b2c
RD
190'W' 00-3F sound/asound.h conflict!
191'X' all fs/xfs/xfs_fs.h conflict!
192 and fs/xfs/linux-2.6/xfs_ioctl32.h
193 and include/linux/falloc.h
194 and linux/fs.h
195'X' all fs/ocfs2/ocfs_fs.h conflict!
196'X' 01 linux/pktcdvd.h conflict!
1da177e4 197'Y' all linux/cyclades.h
cb5a8b2c
RD
198'Z' 14-15 drivers/message/fusion/mptctl.h
199'[' 00-07 linux/usb/tmc.h USB Test and Measurement Devices
bc5bca53 200 <mailto:gregkh@linuxfoundation.org>
cb5a8b2c 201'a' all linux/atm*.h, linux/sonet.h ATM on linux
0ea6e611 202 <http://lrcwww.epfl.ch/>
cea4001a 203'a' 00-0F drivers/crypto/qat/qat_common/adf_cfg_common.h conflict! qat driver
cb5a8b2c 204'b' 00-FF conflict! bit3 vme host bridge
1da177e4 205 <mailto:natalia@nikhefk.nikhef.nl>
cb5a8b2c 206'c' all linux/cm4000_cs.h conflict!
1da177e4
LT
207'c' 00-7F linux/comstats.h conflict!
208'c' 00-7F linux/coda.h conflict!
cb5a8b2c
RD
209'c' 00-1F linux/chio.h conflict!
210'c' 80-9F arch/s390/include/asm/chsc.h conflict!
211'c' A0-AF arch/x86/include/asm/msr.h conflict!
1da177e4 212'd' 00-FF linux/char/drm/drm/h conflict!
cb5a8b2c 213'd' 02-40 pcmcia/ds.h conflict!
1da177e4
LT
214'd' F0-FF linux/digi1.h
215'e' all linux/digi1.h conflict!
cb5a8b2c
RD
216'e' 00-1F drivers/net/irda/irtty-sir.h conflict!
217'f' 00-1F linux/ext2_fs.h conflict!
218'f' 00-1F linux/ext3_fs.h conflict!
219'f' 00-0F fs/jfs/jfs_dinode.h conflict!
220'f' 00-0F fs/ext4/ext4.h conflict!
221'f' 00-0F linux/fs.h conflict!
222'f' 00-0F fs/ocfs2/ocfs2_fs.h conflict!
223'g' 00-0F linux/usb/gadgetfs.h
224'g' 20-2F linux/usb/g_printer.h
225'h' 00-7F conflict! Charon filesystem
1da177e4 226 <mailto:zapman@interlan.net>
cb5a8b2c 227'h' 00-1F linux/hpet.h conflict!
a051f71c 228'h' 80-8F fs/hfsplus/ioctl.c
cb5a8b2c
RD
229'i' 00-3F linux/i2o-dev.h conflict!
230'i' 0B-1F linux/ipmi.h conflict!
231'i' 80-8F linux/i8k.h
1da177e4 232'j' 00-3F linux/joystick.h
cb5a8b2c
RD
233'k' 00-0F linux/spi/spidev.h conflict!
234'k' 00-05 video/kyro.h conflict!
43139a61 235'k' 10-17 linux/hsi/hsi_char.h HSI character device
1da177e4 236'l' 00-3F linux/tcfs_fs.h transparent cryptographic file system
0ea6e611 237 <http://web.archive.org/web/*/http://mikonos.dia.unisa.it/tcfs>
1da177e4 238'l' 40-7F linux/udf_fs_i.h in development:
98766fbe 239 <http://sourceforge.net/projects/linux-udf/>
cb5a8b2c 240'm' 00-09 linux/mmtimer.h conflict!
1da177e4
LT
241'm' all linux/mtio.h conflict!
242'm' all linux/soundcard.h conflict!
243'm' all linux/synclink.h conflict!
cb5a8b2c
RD
244'm' 00-19 drivers/message/fusion/mptctl.h conflict!
245'm' 00 drivers/scsi/megaraid/megaraid_ioctl.h conflict!
1da177e4 246'm' 00-1F net/irda/irmod.h conflict!
cb5a8b2c 247'n' 00-7F linux/ncp_fs.h and fs/ncpfs/ioctl.c
1392e3b3 248'n' 80-8F linux/nilfs2_fs.h NILFS2
cb5a8b2c 249'n' E0-FF linux/matroxfb.h matroxfb
7f68fc28 250'o' 00-1F fs/ocfs2/ocfs2_fs.h OCFS2
cb5a8b2c
RD
251'o' 00-03 mtd/ubi-user.h conflict! (OCFS2 and UBI overlaps)
252'o' 40-41 mtd/ubi-user.h UBI
253'o' 01-A1 linux/dvb/*.h DVB
cef2cf07 254'p' 00-0F linux/phantom.h conflict! (OpenHaptics needs this)
cb5a8b2c 255'p' 00-1F linux/rtc.h conflict!
cef2cf07 256'p' 00-3F linux/mc146818rtc.h conflict!
1da177e4 257'p' 40-7F linux/nvram.h
cb5a8b2c 258'p' 80-9F linux/ppdev.h user-space parport
1da177e4 259 <mailto:tim@cyberelk.net>
717c0336 260'p' A1-A5 linux/pps.h LinuxPPS
eae9d2ba 261 <mailto:giometti@linux.it>
1da177e4 262'q' 00-1F linux/serio.h
cb5a8b2c 263'q' 80-FF linux/telephony.h Internet PhoneJACK, Internet LineJACK
0ea6e611 264 linux/ixjuser.h <http://web.archive.org/web/*/http://www.quicknet.net>
cb5a8b2c 265'r' 00-1F linux/msdos_fs.h and fs/fat/dir.c
1da177e4 266's' all linux/cdk.h
bf7daebb 267't' 00-7F linux/ppp-ioctl.h
1da177e4 268't' 80-8F linux/isdn_ppp.h
fc5462f8 269't' 90-91 linux/toshiba.h toshiba and toshiba_acpi SMM
2116b7a4 270'u' 00-1F linux/smb_fs.h gone
5f708812 271'u' 20-3F linux/uvcvideo.h USB video class host driver
cb5a8b2c
RD
272'v' 00-1F linux/ext2_fs.h conflict!
273'v' 00-1F linux/fs.h conflict!
274'v' 00-0F linux/sonypi.h conflict!
cb5a8b2c 275'v' C0-FF linux/meye.h conflict!
1da177e4
LT
276'w' all CERN SCI driver
277'y' 00-1F packet based user level communications
278 <mailto:zapman@interlan.net>
cb5a8b2c 279'z' 00-3F CAN bus card conflict!
1da177e4 280 <mailto:hdstich@connectu.ulm.circular.de>
cb5a8b2c 281'z' 40-7F CAN bus card conflict!
1da177e4 282 <mailto:oe@port.de>
cb5a8b2c 283'z' 10-4F drivers/s390/crypto/zcrypt_api.h conflict!
474966ee 284'|' 00-7F linux/media.h
1da177e4 2850x80 00-1F linux/fb.h
07983f0e 2860x89 00-06 arch/x86/include/asm/sockios.h
1da177e4
LT
2870x89 0B-DF linux/sockios.h
2880x89 E0-EF linux/sockios.h SIOCPROTOPRIVATE range
cb5a8b2c 2890x89 E0-EF linux/dn.h PROTOPRIVATE range
1da177e4
LT
2900x89 F0-FF linux/sockios.h SIOCDEVPRIVATE range
2910x8B all linux/wireless.h
2920x8C 00-3F WiNRADiO driver
0ea6e611 293 <http://www.winradio.com.au/>
1da177e4 2940x90 00 drivers/cdrom/sbpcd.h
cb5a8b2c 2950x92 00-0F drivers/usb/mon/mon_bin.c
1da177e4 2960x93 60-7F linux/auto_fs.h
cb5a8b2c 2970x94 all fs/btrfs/ioctl.h
fc7f99cf 2980x97 00-7F fs/ceph/ioctl.h Ceph file system
1da177e4
LT
2990x99 00-0F 537-Addinboard driver
300 <mailto:buk@buks.ipn.de>
3010xA0 all linux/sdp/sdp.h Industrial Device Project
302 <mailto:kenji@bitgate.com>
ea41b1e5 3030xA2 00-0F arch/tile/include/asm/hardwall.h
1da177e4
LT
3040xA3 80-8F Port ACL in development:
305 <mailto:tlewis@mindspring.com>
3060xA3 90-9F linux/dtlk.h
1038628d 3070xAA 00-3F linux/uapi/linux/userfaultfd.h
1da177e4
LT
3080xAB 00-1F linux/nbd.h
3090xAC 00-1F linux/raw.h
3100xAD 00 Netfilter device in development:
cb5a8b2c 311 <mailto:rusty@rustcorp.com.au>
258ac8e0 3120xAE all linux/kvm.h Kernel-based Virtual Machine
0aaeb3b1 313 <mailto:kvm@vger.kernel.org>
6db71994 3140xAF 00-1F linux/fsl_hypervisor.h Freescale hypervisor
1da177e4
LT
3150xB0 all RATIO devices in development:
316 <mailto:vgo@ratio.de>
3170xB1 00-1F PPPoX <mailto:mostrows@styx.uwaterloo.ca>
cb87ea28 3180xB3 00 linux/mmc/ioctl.h
cb5a8b2c 3190xC0 00-0F linux/usb/iowarrior.h
a9282d01 3200xCA 00-0F uapi/misc/cxl.h
65be2c79 3210xCA 80-8F uapi/scsi/cxlflash_ioctl.h
1da177e4
LT
3220xCB 00-1F CBM serial IEC bus in development:
323 <mailto:michael.klein@puffin.lb.shuttle.de>
cb5a8b2c
RD
3240xCD 01 linux/reiserfs_fs.h
3250xCF 02 fs/cifs/ioctl.c
3260xDB 00-0F drivers/char/mwave/mwavepub.h
1da177e4
LT
3270xDD 00-3F ZFCP device driver see drivers/s390/scsi/
328 <mailto:aherrman@de.ibm.com>
00c570f4 3290xE5 00-3F linux/fuse.h
e7c256fb 3300xEC 00-01 drivers/platform/chrome/cros_ec_dev.h ChromeOS EC driver
cb5a8b2c 3310xF3 00-3F drivers/usb/misc/sisusbvga/sisusb.h sisfb (in development)
1da177e4 332 <mailto:thomas@winischhofer.net>
1ce4d390
RA
3330xF4 00-1F video/mbxfb.h mbxfb
334 <mailto:raph@8d.com>
14d01ff5
MD
3350xF6 all LTTng Linux Trace Toolkit Next Generation
336 <mailto:mathieu.desnoyers@efficios.com>
cb5a8b2c 3370xFD all linux/dm-ioctl.h