1 ============= 2 Ioctl Numbers 3 ============= 4 5 19 October 1999 6 7 Michael Elizabeth Chastain 8 <mec@shout.net> 9 10 If you are adding new ioctl's to the kernel, you should use the _IO 11 macros 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 21 system calls 'write' and 'read'. For example, a SET_FOO ioctl would 22 be _IOW, although the kernel would actually read data from user space; 23 a GET_FOO ioctl would be _IOR, although the kernel would actually write 24 data to user space. 25 26 The first argument to _IO, _IOW, _IOR, or _IOWR is an identifying letter 27 or number from the table below. Because of the large number of drivers, 28 many drivers share a partial letter with other drivers. 29 30 If you are writing a driver for a new device and need a letter, pick an 31 unused block with enough room for expansion: 32 to 256 ioctl commands. 32 You can register the block by patching this file and submitting the 33 patch to Linus Torvalds. Or you can e-mail me at <mec@shout.net> and 34 I'll register one for you. 35 36 The second argument to _IO, _IOW, _IOR, or _IOWR is a sequence number 37 to 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 39 out of the kernel (e.g. 'int' or 'struct foo'). NOTE! Do NOT use 40 sizeof(arg) as the third argument as this results in your ioctl thinking 41 it passes an argument of type size_t. 42 43 Some devices use their major number as the identifier; this is OK, as 44 long as it is unique. Some devices are irregular and don't follow any 45 convention at all. 46 47 Following 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 65 This table lists ioctls visible from user land for Linux/x86. It contains 66 most drivers up to 2.6.31, but I know I am missing some. There has been 67 no attempt to list non-X86 architectures or ioctls from drivers/staging/. 68 69 ==== ===== ======================================================= ================================================================ 70 Code Seq# Include File Comments 71 (hex) 72 ==== ===== ======================================================= ================================================================ 73 0x00 00-1F linux/fs.h conflict! 74 0x00 00-1F scsi/scsi_ioctl.h conflict! 75 0x00 00-1F linux/fb.h conflict! 76 0x00 00-1F linux/wavefront.h conflict! 77 0x02 all linux/fd.h 78 0x03 all linux/hdreg.h 79 0x04 D2-DC linux/umsdos_fs.h Dead since 2.6.11, but don't reuse these. 80 0x06 all linux/lp.h 81 0x07 9F-D0 linux/vmw_vmci_defs.h, uapi/linux/vm_sockets.h 82 0x09 all linux/raid/md_u.h 83 0x10 00-0F drivers/char/s390/vmcp.h 84 0x10 10-1F arch/s390/include/uapi/sclp_ctl.h 85 0x10 20-2F arch/s390/include/uapi/asm/hypfs.h 86 0x12 all linux/fs.h BLK* ioctls 87 linux/blkpg.h 88 0x15 all linux/fs.h FS_IOC_* ioctls 89 0x1b all InfiniBand Subsystem 90 <http://infiniband.sourceforge.net/> 91 0x20 all drivers/cdrom/cm206.h 92 0x22 all scsi/sg.h 93 0x3E 00-0F linux/counter.h <mailto:linux-iio@vger.kernel.org> 94 '!' 00-1F uapi/linux/seccomp.h 95 '#' 00-3F IEEE 1394 Subsystem 96 Block for the entire subsystem 97 '$' 00-0F linux/perf_counter.h, linux/perf_event.h 98 '%' 00-0F include/uapi/linux/stm.h System Trace Module subsystem 99 <mailto:alexander.shishkin@linux.intel.com> 100 '&' 00-07 drivers/firewire/nosy-user.h 101 '*' 00-1F uapi/linux/user_events.h User Events Subsystem 102 <mailto:linux-trace-kernel@vger.kernel.org> 103 '1' 00-1F linux/timepps.h PPS kit from Ulrich Windl 104 <ftp://ftp.de.kernel.org/pub/linux/daemons/ntp/PPS/> 105 '2' 01-04 linux/i2o.h 106 '3' 00-0F drivers/s390/char/raw3270.h conflict! 107 '3' 00-1F linux/suspend_ioctls.h, conflict! 108 kernel/power/user.c 109 '8' all SNP8023 advanced NIC card 110 <mailto:mcr@solidum.com> 111 ';' 64-7F linux/vfio.h 112 ';' 80-FF linux/iommufd.h 113 '=' 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.h 119 '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.h 128 'D' 40-5F drivers/scsi/dpt/dtpi_ioctl.h Dead since 2022 129 'D' 05 drivers/scsi/pmcraid.h 130 '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.h 157 'H' 00-0F uapi/misc/habanalabs.h conflict! 158 'H' A0 uapi/linux/usb/cdc-wdm.h 159 '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.h 165 '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.h 169 '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 driver 172 <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.c 176 'M' 01-03 drivers/scsi/megaraid/megaraid_sas.h 177 'M' 00-0F drivers/video/fsl-diu-fb.h conflict! 178 'N' 00-1F drivers/usb/scanner.h 179 'N' 40-7F drivers/block/nvme.c 180 'N' 80-8F uapi/linux/ntsync.h NT synchronization primitives 181 <mailto:wine-devel@winehq.org> 182 'O' 00-06 mtd/ubi-user.h UBI 183 '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.h 190 'R' 00-1F linux/random.h conflict! 191 'R' 01 linux/rfkill.h conflict! 192 'R' 20-2F linux/trace_mmap.h 193 'R' C0-DF net/bluetooth/rfcomm.h 194 'R' E0 uapi/linux/fsl_mc.h 195 '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.h 206 'U' C0-CF drivers/bluetooth/hci_uart.h 207 '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.c 216 'W' 60-61 linux/watch_queue.h 217 '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.h 224 '[' 00-3F linux/usb/tmc.h USB Test and Measurement Devices 225 <mailto:gregkh@linuxfoundation.org> 226 'a' all linux/atm*.h, linux/sonet.h ATM on linux 227 <http://lrcwww.epfl.ch/> 228 'a' 00-0F drivers/crypto/qat/qat_common/adf_cfg_common.h conflict! qat driver 229 'b' 00-FF conflict! bit3 vme host bridge 230 <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.h 240 '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.h 248 'f' 81-8F linux/fsverity.h 249 'g' 00-0F linux/usb/gadgetfs.h 250 'g' 20-2F linux/usb/g_printer.h 251 'h' 00-7F conflict! Charon filesystem 252 <mailto:zapman@interlan.net> 253 'h' 00-1F linux/hpet.h conflict! 254 'h' 80-8F fs/hfsplus/ioctl.c 255 'i' 00-3F linux/i2o-dev.h conflict! 256 'i' 0B-1F linux/ipmi.h conflict! 257 'i' 80-8F linux/i8k.h 258 'i' 90-9F `linux/iio/*.h` IIO 259 'j' 00-3F linux/joystick.h 260 '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 device 263 'l' 00-3F linux/tcfs_fs.h transparent cryptographic file system 264 <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.c 274 'n' 80-8F uapi/linux/nilfs2_api.h NILFS2 275 'n' E0-FF linux/matroxfb.h matroxfb 276 'o' 00-1F fs/ocfs2/ocfs2_fs.h OCFS2 277 'o' 00-03 mtd/ubi-user.h conflict! (OCFS2 and UBI overlaps) 278 'o' 40-41 mtd/ubi-user.h UBI 279 'o' 01-A1 `linux/dvb/*.h` DVB 280 'p' 00-0F linux/phantom.h conflict! (OpenHaptics needs this) 281 'p' 00-1F linux/rtc.h conflict! 282 'p' 40-7F linux/nvram.h 283 'p' 80-9F linux/ppdev.h user-space parport 284 <mailto:tim@cyberelk.net> 285 'p' A1-A5 linux/pps.h LinuxPPS 286 <mailto:giometti@linux.it> 287 'q' 00-1F linux/serio.h 288 'q' 80-FF linux/telephony.h Internet PhoneJACK, Internet LineJACK 289 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.c 291 's' all linux/cdk.h 292 't' 00-7F linux/ppp-ioctl.h 293 't' 80-8F linux/isdn_ppp.h 294 't' 90-91 linux/toshiba.h toshiba and toshiba_acpi SMM 295 'u' 00-1F linux/smb_fs.h gone 296 'u' 00-2F linux/ublk_cmd.h conflict! 297 'u' 20-3F linux/uvcvideo.h USB video class host driver 298 'u' 40-4f linux/udmabuf.h userspace dma-buf misc device 299 '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 API 304 'v' C0-FF linux/meye.h conflict! 305 'w' all CERN SCI driver 306 'y' 00-1F packet based user level communications 307 <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.h 314 0x80 00-1F linux/fb.h 315 0x81 00-1F linux/vduse.h 316 0x89 00-06 arch/x86/include/asm/sockios.h 317 0x89 0B-DF linux/sockios.h 318 0x89 E0-EF linux/sockios.h SIOCPROTOPRIVATE range 319 0x89 F0-FF linux/sockios.h SIOCDEVPRIVATE range 320 0x8A 00-1F linux/eventpoll.h 321 0x8B all linux/wireless.h 322 0x8C 00-3F WiNRADiO driver 323 <http://www.winradio.com.au/> 324 0x90 00 drivers/cdrom/sbpcd.h 325 0x92 00-0F drivers/usb/mon/mon_bin.c 326 0x93 60-7F linux/auto_fs.h 327 0x94 all fs/btrfs/ioctl.h Btrfs filesystem 328 and linux/fs.h some lifted to vfs/generic 329 0x97 00-7F fs/ceph/ioctl.h Ceph file system 330 0x99 00-0F 537-Addinboard driver 331 <mailto:buk@buks.ipn.de> 332 0xA0 all linux/sdp/sdp.h Industrial Device Project 333 <mailto:kenji@bitgate.com> 334 0xA1 0 linux/vtpm_proxy.h TPM Emulator Proxy Driver 335 0xA2 all uapi/linux/acrn.h ACRN hypervisor 336 0xA3 80-8F Port ACL in development: 337 <mailto:tlewis@mindspring.com> 338 0xA3 90-9F linux/dtlk.h 339 0xA4 00-1F uapi/linux/tee.h Generic TEE subsystem 340 0xA4 00-1F uapi/asm/sgx.h <mailto:linux-sgx@vger.kernel.org> 341 0xA5 01-05 linux/surface_aggregator/cdev.h Microsoft Surface Platform System Aggregator 342 <mailto:luzmaximilian@gmail.com> 343 0xA5 20-2F linux/surface_aggregator/dtx.h Microsoft Surface DTX driver 344 <mailto:luzmaximilian@gmail.com> 345 0xAA 00-3F linux/uapi/linux/userfaultfd.h 346 0xAB 00-1F linux/nbd.h 347 0xAC 00-1F linux/raw.h 348 0xAD 00 Netfilter device in development: 349 <mailto:rusty@rustcorp.com.au> 350 0xAE 00-1F linux/kvm.h Kernel-based Virtual Machine 351 <mailto:kvm@vger.kernel.org> 352 0xAE 40-FF linux/kvm.h Kernel-based Virtual Machine 353 <mailto:kvm@vger.kernel.org> 354 0xAE 20-3F linux/nitro_enclaves.h Nitro Enclaves 355 0xAF 00-1F linux/fsl_hypervisor.h Freescale hypervisor 356 0xB0 all RATIO devices in development: 357 <mailto:vgo@ratio.de> 358 0xB1 00-1F PPPoX 359 <mailto:mostrows@styx.uwaterloo.ca> 360 0xB2 00 arch/powerpc/include/uapi/asm/papr-vpd.h powerpc/pseries VPD API 361 <mailto:linuxppc-dev> 362 0xB2 01-02 arch/powerpc/include/uapi/asm/papr-sysparm.h powerpc/pseries system parameter API 363 <mailto:linuxppc-dev> 364 0xB3 00 linux/mmc/ioctl.h 365 0xB4 00-0F linux/gpio.h <mailto:linux-gpio@vger.kernel.org> 366 0xB5 00-0F uapi/linux/rpmsg.h <mailto:linux-remoteproc@vger.kernel.org> 367 0xB6 all linux/fpga-dfl.h 368 0xB7 all uapi/linux/remoteproc_cdev.h <mailto:linux-remoteproc@vger.kernel.org> 369 0xB7 all uapi/linux/nsfs.h <mailto:Andrei Vagin <avagin@openvz.org>> 370 0xB8 01-02 uapi/misc/mrvl_cn10k_dpi.h Marvell CN10K DPI driver 371 0xC0 00-0F linux/usb/iowarrior.h 372 0xCA 00-0F uapi/misc/cxl.h 373 0xCA 10-2F uapi/misc/ocxl.h 374 0xCA 80-BF uapi/scsi/cxlflash_ioctl.h 375 0xCB 00-1F CBM serial IEC bus in development: 376 <mailto:michael.klein@puffin.lb.shuttle.de> 377 0xCC 00-0F drivers/misc/ibmvmc.h pseries VMC driver 378 0xCD 01 linux/reiserfs_fs.h 379 0xCE 01-02 uapi/linux/cxl_mem.h Compute Express Link Memory Devices 380 0xCF 02 fs/smb/client/cifs_ioctl.h 381 0xDB 00-0F drivers/char/mwave/mwavepub.h 382 0xDD 00-3F ZFCP device driver see drivers/s390/scsi/ 383 <mailto:aherrman@de.ibm.com> 384 0xE5 00-3F linux/fuse.h 385 0xEC 00-01 drivers/platform/chrome/cros_ec_dev.h ChromeOS EC driver 386 0xEE 00-09 uapi/linux/pfrut.h Platform Firmware Runtime Update and Telemetry 387 0xF3 00-3F drivers/usb/misc/sisusbvga/sisusb.h sisfb (in development) 388 <mailto:thomas@winischhofer.net> 389 0xF6 all LTTng Linux Trace Toolkit Next Generation 390 <mailto:mathieu.desnoyers@efficios.com> 391 0xF8 all arch/x86/include/uapi/asm/amd_hsmp.h AMD HSMP EPYC system management interface driver 392 <mailto:nchatrad@amd.com> 393 0xFD all linux/dm-ioctl.h 394 0xFE all linux/isst_if.h 395 ==== ===== ======================================================= ================================================================
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