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| -rw-r--r-- | Documentation/ioctl/botching-up-ioctls.rst (renamed from Documentation/ioctl/botching-up-ioctls.txt) | 1 | ||||
| -rw-r--r-- | Documentation/ioctl/cdrom.rst | 1233 | ||||
| -rw-r--r-- | Documentation/ioctl/cdrom.txt | 967 | ||||
| -rw-r--r-- | Documentation/ioctl/hdio.rst (renamed from Documentation/ioctl/hdio.txt) | 835 | ||||
| -rw-r--r-- | Documentation/ioctl/index.rst | 16 | ||||
| -rw-r--r-- | Documentation/ioctl/ioctl-decoding.rst (renamed from Documentation/ioctl/ioctl-decoding.txt) | 13 | ||||
| -rw-r--r-- | drivers/gpu/drm/drm_ioctl.c | 2 |
7 files changed, 1814 insertions, 1253 deletions
diff --git a/Documentation/ioctl/botching-up-ioctls.txt b/Documentation/ioctl/botching-up-ioctls.rst index 883fb034bd04..ac697fef3545 100644 --- a/Documentation/ioctl/botching-up-ioctls.txt +++ b/Documentation/ioctl/botching-up-ioctls.rst @@ -1,3 +1,4 @@ +================================= (How to avoid) Botching up ioctls ================================= diff --git a/Documentation/ioctl/cdrom.rst b/Documentation/ioctl/cdrom.rst new file mode 100644 index 000000000000..3b4c0506de46 --- /dev/null +++ b/Documentation/ioctl/cdrom.rst @@ -0,0 +1,1233 @@ +============================ +Summary of CDROM ioctl calls +============================ + +- Edward A. Falk <efalk@google.com> + +November, 2004 + +This document attempts to describe the ioctl(2) calls supported by +the CDROM layer. These are by-and-large implemented (as of Linux 2.6) +in drivers/cdrom/cdrom.c and drivers/block/scsi_ioctl.c + +ioctl values are listed in <linux/cdrom.h>. As of this writing, they +are as follows: + + ====================== =============================================== + CDROMPAUSE Pause Audio Operation + CDROMRESUME Resume paused Audio Operation + CDROMPLAYMSF Play Audio MSF (struct cdrom_msf) + CDROMPLAYTRKIND Play Audio Track/index (struct cdrom_ti) + CDROMREADTOCHDR Read TOC header (struct cdrom_tochdr) + CDROMREADTOCENTRY Read TOC entry (struct cdrom_tocentry) + CDROMSTOP Stop the cdrom drive + CDROMSTART Start the cdrom drive + CDROMEJECT Ejects the cdrom media + CDROMVOLCTRL Control output volume (struct cdrom_volctrl) + CDROMSUBCHNL Read subchannel data (struct cdrom_subchnl) + CDROMREADMODE2 Read CDROM mode 2 data (2336 Bytes) + (struct cdrom_read) + CDROMREADMODE1 Read CDROM mode 1 data (2048 Bytes) + (struct cdrom_read) + CDROMREADAUDIO (struct cdrom_read_audio) + CDROMEJECT_SW enable(1)/disable(0) auto-ejecting + CDROMMULTISESSION Obtain the start-of-last-session + address of multi session disks + (struct cdrom_multisession) + CDROM_GET_MCN Obtain the "Universal Product Code" + if available (struct cdrom_mcn) + CDROM_GET_UPC Deprecated, use CDROM_GET_MCN instead. + CDROMRESET hard-reset the drive + CDROMVOLREAD Get the drive's volume setting + (struct cdrom_volctrl) + CDROMREADRAW read data in raw mode (2352 Bytes) + (struct cdrom_read) + CDROMREADCOOKED read data in cooked mode + CDROMSEEK seek msf address + CDROMPLAYBLK scsi-cd only, (struct cdrom_blk) + CDROMREADALL read all 2646 bytes + CDROMGETSPINDOWN return 4-bit spindown value + CDROMSETSPINDOWN set 4-bit spindown value + CDROMCLOSETRAY pendant of CDROMEJECT + CDROM_SET_OPTIONS Set behavior options + CDROM_CLEAR_OPTIONS Clear behavior options + CDROM_SELECT_SPEED Set the CD-ROM speed + CDROM_SELECT_DISC Select disc (for juke-boxes) + CDROM_MEDIA_CHANGED Check is media changed + CDROM_DRIVE_STATUS Get tray position, etc. + CDROM_DISC_STATUS Get disc type, etc. + CDROM_CHANGER_NSLOTS Get number of slots + CDROM_LOCKDOOR lock or unlock door + CDROM_DEBUG Turn debug messages on/off + CDROM_GET_CAPABILITY get capabilities + CDROMAUDIOBUFSIZ set the audio buffer size + DVD_READ_STRUCT Read structure + DVD_WRITE_STRUCT Write structure + DVD_AUTH Authentication + CDROM_SEND_PACKET send a packet to the drive + CDROM_NEXT_WRITABLE get next writable block + CDROM_LAST_WRITTEN get last block written on disc + ====================== =============================================== + + +The information that follows was determined from reading kernel source +code. It is likely that some corrections will be made over time. + +------------------------------------------------------------------------------ + +General: + + Unless otherwise specified, all ioctl calls return 0 on success + and -1 with errno set to an appropriate value on error. (Some + ioctls return non-negative data values.) + + Unless otherwise specified, all ioctl calls return -1 and set + errno to EFAULT on a failed attempt to copy data to or from user + address space. + + Individual drivers may return error codes not listed here. + + Unless otherwise specified, all data structures and constants + are defined in <linux/cdrom.h> + +------------------------------------------------------------------------------ + + +CDROMPAUSE + Pause Audio Operation + + + usage:: + + ioctl(fd, CDROMPAUSE, 0); + + + inputs: + none + + + outputs: + none + + + error return: + - ENOSYS cd drive not audio-capable. + + +CDROMRESUME + Resume paused Audio Operation + + + usage:: + + ioctl(fd, CDROMRESUME, 0); + + + inputs: + none + + + outputs: + none + + + error return: + - ENOSYS cd drive not audio-capable. + + +CDROMPLAYMSF + Play Audio MSF + + (struct cdrom_msf) + + + usage:: + + struct cdrom_msf msf; + + ioctl(fd, CDROMPLAYMSF, &msf); + + inputs: + cdrom_msf structure, describing a segment of music to play + + + outputs: + none + + + error return: + - ENOSYS cd drive not audio-capable. + + notes: + - MSF stands for minutes-seconds-frames + - LBA stands for logical block address + - Segment is described as start and end times, where each time + is described as minutes:seconds:frames. + A frame is 1/75 of a second. + + +CDROMPLAYTRKIND + Play Audio Track/index + + (struct cdrom_ti) + + + usage:: + + struct cdrom_ti ti; + + ioctl(fd, CDROMPLAYTRKIND, &ti); + + inputs: + cdrom_ti structure, describing a segment of music to play + + + outputs: + none + + + error return: + - ENOSYS cd drive not audio-capable. + + notes: + - Segment is described as start and end times, where each time + is described as a track and an index. + + + +CDROMREADTOCHDR + Read TOC header + + (struct cdrom_tochdr) + + + usage:: + + cdrom_tochdr header; + + ioctl(fd, CDROMREADTOCHDR, &header); + + inputs: + cdrom_tochdr structure + + + outputs: + cdrom_tochdr structure + + + error return: + - ENOSYS cd drive not audio-capable. + + + +CDROMREADTOCENTRY + Read TOC entry + + (struct cdrom_tocentry) + + + usage:: + + struct cdrom_tocentry entry; + + ioctl(fd, CDROMREADTOCENTRY, &entry); + + inputs: + cdrom_tocentry structure + + + outputs: + cdrom_tocentry structure + + + error return: + - ENOSYS cd drive not audio-capable. + - EINVAL entry.cdte_format not CDROM_MSF or CDROM_LBA + - EINVAL requested track out of bounds + - EIO I/O error reading TOC + + notes: + - TOC stands for Table Of Contents + - MSF stands for minutes-seconds-frames + - LBA stands for logical block address + + + +CDROMSTOP + Stop the cdrom drive + + + usage:: + + ioctl(fd, CDROMSTOP, 0); + + + inputs: + none + + + outputs: + none + + + error return: + - ENOSYS cd drive not audio-capable. + + notes: + - Exact interpretation of this ioctl depends on the device, + but most seem to spin the drive down. + + +CDROMSTART + Start the cdrom drive + + + usage:: + + ioctl(fd, CDROMSTART, 0); + + + inputs: + none + + + outputs: + none + + + error return: + - ENOSYS cd drive not audio-capable. + + notes: + - Exact interpretation of this ioctl depends on the device, + but most seem to spin the drive up and/or close the tray. + Other devices ignore the ioctl completely. + + +CDROMEJECT + - Ejects the cdrom media + + + usage:: + + ioctl(fd, CDROMEJECT, 0); + + + inputs: + none + + + outputs: + none + + + error returns: + - ENOSYS cd drive not capable of ejecting + - EBUSY other processes are accessing drive, or door is locked + + notes: + - See CDROM_LOCKDOOR, below. + + + + +CDROMCLOSETRAY + pendant of CDROMEJECT + + + usage:: + + ioctl(fd, CDROMCLOSETRAY, 0); + + + inputs: + none + + + outputs: + none + + + error returns: + - ENOSYS cd drive not capable of closing the tray + - EBUSY other processes are accessing drive, or door is locked + + notes: + - See CDROM_LOCKDOOR, below. + + + + +CDROMVOLCTRL + Control output volume (struct cdrom_volctrl) + + + usage:: + + struct cdrom_volctrl volume; + + ioctl(fd, CDROMVOLCTRL, &volume); + + inputs: + cdrom_volctrl structure containing volumes for up to 4 + channels. + + outputs: + none + + + error return: + - ENOSYS cd drive not audio-capable. + + + +CDROMVOLREAD + Get the drive's volume setting + + (struct cdrom_volctrl) + + + usage:: + + struct cdrom_volctrl volume; + + ioctl(fd, CDROMVOLREAD, &volume); + + inputs: + none + + + outputs: + The current volume settings. + + + error return: + - ENOSYS cd drive not audio-capable. + + + +CDROMSUBCHNL + Read subchannel data + + (struct cdrom_subchnl) + + + usage:: + + struct cdrom_subchnl q; + + ioctl(fd, CDROMSUBCHNL, &q); + + inputs: + cdrom_subchnl structure + + + outputs: + cdrom_subchnl structure + + + error return: + - ENOSYS cd drive not audio-capable. + - EINVAL format not CDROM_MSF or CDROM_LBA + + notes: + - Format is converted to CDROM_MSF or CDROM_LBA + as per user request on return + + + +CDROMREADRAW + read data in raw mode (2352 Bytes) + + (struct cdrom_read) + + usage:: + + union { + + struct cdrom_msf msf; /* input */ + char buffer[CD_FRAMESIZE_RAW]; /* return */ + } arg; + ioctl(fd, CDROMREADRAW, &arg); + + inputs: + cdrom_msf structure indicating an address to read. + + Only the start values are significant. + + outputs: + Data written to address provided by user. + + + error return: + - EINVAL address less than 0, or msf less than 0:2:0 + - ENOMEM out of memory + + notes: + - As of 2.6.8.1, comments in <linux/cdrom.h> indicate that this + ioctl accepts a cdrom_read structure, but actual source code + reads a cdrom_msf structure and writes a buffer of data to + the same address. + + - MSF values are converted to LBA values via this formula:: + + lba = (((m * CD_SECS) + s) * CD_FRAMES + f) - CD_MSF_OFFSET; + + + + +CDROMREADMODE1 + Read CDROM mode 1 data (2048 Bytes) + + (struct cdrom_read) + + notes: + Identical to CDROMREADRAW except that block size is + CD_FRAMESIZE (2048) bytes + + + +CDROMREADMODE2 + Read CDROM mode 2 data (2336 Bytes) + + (struct cdrom_read) + + notes: + Identical to CDROMREADRAW except that block size is + CD_FRAMESIZE_RAW0 (2336) bytes + + + +CDROMREADAUDIO + (struct cdrom_read_audio) + + usage:: + + struct cdrom_read_audio ra; + + ioctl(fd, CDROMREADAUDIO, &ra); + + inputs: + cdrom_read_audio structure containing read start + point and length + + outputs: + audio data, returned to buffer indicated by ra + + + error return: + - EINVAL format not CDROM_MSF or CDROM_LBA + - EINVAL nframes not in range [1 75] + - ENXIO drive has no queue (probably means invalid fd) + - ENOMEM out of memory + + +CDROMEJECT_SW + enable(1)/disable(0) auto-ejecting + + + usage:: + + int val; + + ioctl(fd, CDROMEJECT_SW, val); + + inputs: + Flag specifying auto-eject flag. + + + outputs: + none + + + error return: + - ENOSYS Drive is not capable of ejecting. + - EBUSY Door is locked + + + + +CDROMMULTISESSION + Obtain the start-of-last-session address of multi session disks + + (struct cdrom_multisession) + + usage:: + + struct cdrom_multisession ms_info; + + ioctl(fd, CDROMMULTISESSION, &ms_info); + + inputs: + cdrom_multisession structure containing desired + + format. + + outputs: + cdrom_multisession structure is filled with last_session + information. + + error return: + - EINVAL format not CDROM_MSF or CDROM_LBA + + +CDROM_GET_MCN + Obtain the "Universal Product Code" + if available + + (struct cdrom_mcn) + + + usage:: + + struct cdrom_mcn mcn; + + ioctl(fd, CDROM_GET_MCN, &mcn); + + inputs: + none + + + outputs: + Universal Product Code + + + error return: + - ENOSYS Drive is not capable of reading MCN data. + + notes: + - Source code comments state:: + + The following function is implemented, although very few + audio discs give Universal Product Code information, which + should just be the Medium Catalog Number on the box. Note, + that the way the code is written on the CD is /not/ uniform + across all discs! + + + + +CDROM_GET_UPC + CDROM_GET_MCN (deprecated) + + + Not implemented, as of 2.6.8.1 + + + +CDROMRESET + hard-reset the drive + + + usage:: + + ioctl(fd, CDROMRESET, 0); + + + inputs: + none + + + outputs: + none + + + error return: + - EACCES Access denied: requires CAP_SYS_ADMIN + - ENOSYS Drive is not capable of resetting. + + + + +CDROMREADCOOKED + read data in cooked mode + + + usage:: + + u8 buffer[CD_FRAMESIZE] + + ioctl(fd, CDROMREADCOOKED, buffer); + + inputs: + none + + + outputs: + 2048 bytes of data, "cooked" mode. + + + notes: + Not implemented on all drives. + + + + + +CDROMREADALL + read all 2646 bytes + + + Same as CDROMREADCOOKED, but reads 2646 bytes. + + + +CDROMSEEK + seek msf address + + + usage:: + + struct cdrom_msf msf; + + ioctl(fd, CDROMSEEK, &msf); + + inputs: + MSF address to seek to. + + + outputs: + none + + + + +CDROMPLAYBLK + scsi-cd only + + (struct cdrom_blk) + + + usage:: + + struct cdrom_blk blk; + + ioctl(fd, CDROMPLAYBLK, &blk); + + inputs: + Region to play + + + outputs: + none + + + + +CDROMGETSPINDOWN + usage:: + + char spindown; + + ioctl(fd, CDROMGETSPINDOWN, &spindown); + + inputs: + none + + + outputs: + The value of the current 4-bit spindown value. + + + + + +CDROMSETSPINDOWN + usage:: + + char spindown + + ioctl(fd, CDROMSETSPINDOWN, &spindown); + + inputs: + 4-bit value used to control spindown (TODO: more detail here) + + + outputs: + none + + + + + + +CDROM_SET_OPTIONS + Set behavior options + + + usage:: + + int options; + + ioctl(fd, CDROM_SET_OPTIONS, options); + + inputs: + New values for drive options. The logical 'or' of: + + ============== ================================== + CDO_AUTO_CLOSE close tray on first open(2) + CDO_AUTO_EJECT open tray on last release + CDO_USE_FFLAGS use O_NONBLOCK information on open + CDO_LOCK lock tray on open files + CDO_CHECK_TYPE check type on open for data + ============== ================================== + + outputs: + Returns the resulting options settings in the + ioctl return value. Returns -1 on error. + + error return: + - ENOSYS selected option(s) not supported by drive. + + + + +CDROM_CLEAR_OPTIONS + Clear behavior options + + + Same as CDROM_SET_OPTIONS, except that selected options are + turned off. + + + +CDROM_SELECT_SPEED + Set the CD-ROM speed + + + usage:: + + int speed; + + ioctl(fd, CDROM_SELECT_SPEED, speed); + + inputs: + New drive speed. + + + outputs: + none + + + error return: + - ENOSYS speed selection not supported by drive. + + + +CDROM_SELECT_DISC + Select disc (for juke-boxes) + + + usage:: + + int disk; + + ioctl(fd, CDROM_SELECT_DISC, disk); + + inputs: + Disk to load into drive. + + + outputs: + none + + + error return: + - EINVAL Disk number beyond capacity of drive + + + +CDROM_MEDIA_CHANGED + Check is media changed + + + usage:: + + int slot; + + ioctl(fd, CDROM_MEDIA_CHANGED, slot); + + inputs: + Slot number to be tested, always zero except for jukeboxes. + + May also be special values CDSL_NONE or CDSL_CURRENT + + outputs: + Ioctl return value is 0 or 1 depending on whether the media + + has been changed, or -1 on error. + + error returns: + - ENOSYS Drive can't detect media change + - EINVAL Slot number beyond capacity of drive + - ENOMEM Out of memory + + + +CDROM_DRIVE_STATUS + Get tray position, etc. + + + usage:: + + int slot; + + ioctl(fd, CDROM_DRIVE_STATUS, slot); + + inputs: + Slot number to be tested, always zero except for jukeboxes. + + May also be special values CDSL_NONE or CDSL_CURRENT + + outputs: + Ioctl return value will be one of the following values + + from <linux/cdrom.h>: + + =================== ========================== + CDS_NO_INFO Information not available. + CDS_NO_DISC + CDS_TRAY_OPEN + CDS_DRIVE_NOT_READY + CDS_DISC_OK + -1 error + =================== ========================== + + error returns: + - ENOSYS Drive can't detect drive status + - EINVAL Slot number beyond capacity of drive + - ENOMEM Out of memory + + + + +CDROM_DISC_STATUS + Get disc type, etc. + + + usage:: + + ioctl(fd, CDROM_DISC_STATUS, 0); + + + inputs: + none + + + outputs: + Ioctl return value will be one of the following values + + from <linux/cdrom.h>: + + - CDS_NO_INFO + - CDS_AUDIO + - CDS_MIXED + - CDS_XA_2_2 + - CDS_XA_2_1 + - CDS_DATA_1 + + error returns: + none at present + + notes: + - Source code comments state:: + + + Ok, this is where problems start. The current interface for + the CDROM_DISC_STATUS ioctl is flawed. It makes the false + assumption that CDs are all CDS_DATA_1 or all CDS_AUDIO, etc. + Unfortunately, while this is often the case, it is also + very common for CDs to have some tracks with data, and some + tracks with audio. Just because I feel like it, I declare + the following to be the best way to cope. If the CD has + ANY data tracks on it, it will be returned as a data CD. + If it has any XA tracks, I will return it as that. Now I + could simplify this interface by combining these returns with + the above, but this more clearly demonstrates the problem + with the current interface. Too bad this wasn't designed + to use bitmasks... -Erik + + Well, now we have the option CDS_MIXED: a mixed-type CD. + User level programmers might feel the ioctl is not very + useful. + ---david + + + + +CDROM_CHANGER_NSLOTS + Get number of slots + + + usage:: + + ioctl(fd, CDROM_CHANGER_NSLOTS, 0); + + + inputs: + none + + + outputs: + The ioctl return value will be the number of slots in a + CD changer. Typically 1 for non-multi-disk devices. + + error returns: + none + + + +CDROM_LOCKDOOR + lock or unlock door + + + usage:: + + int lock; + + ioctl(fd, CDROM_LOCKDOOR, lock); + + inputs: + Door lock flag, 1=lock, 0=unlock + + + outputs: + none + + + error returns: + - EDRIVE_CANT_DO_THIS + + Door lock function not supported. + - EBUSY + + Attempt to unlock when multiple users + have the drive open and not CAP_SYS_ADMIN + + notes: + As of 2.6.8.1, the lock flag is a global lock, meaning that + all CD drives will be locked or unlocked together. This is + probably a bug. + + The EDRIVE_CANT_DO_THIS value is defined in <linux/cdrom.h> + and is currently (2.6.8.1) the same as EOPNOTSUPP + + + +CDROM_DEBUG + Turn debug messages on/off + + + usage:: + + int debug; + + ioctl(fd, CDROM_DEBUG, debug); + + inputs: + Cdrom debug flag, 0=disable, 1=enable + + + outputs: + The ioctl return value will be the new debug flag. + + + error return: + - EACCES Access denied: requires CAP_SYS_ADMIN + + + +CDROM_GET_CAPABILITY + get capabilities + + + usage:: + + ioctl(fd, CDROM_GET_CAPABILITY, 0); + + + inputs: + none + + + outputs: + The ioctl return value is the current device capability + flags. See CDC_CLOSE_TRAY, CDC_OPEN_TRAY, etc. + + + +CDROMAUDIOBUFSIZ + set the audio buffer size + + + usage:: + + int arg; + + ioctl(fd, CDROMAUDIOBUFSIZ, val); + + inputs: + New audio buffer size + + + outputs: + The ioctl return value is the new audio buffer size, or -1 + on error. + + error return: + - ENOSYS Not supported by this driver. + + notes: + Not supported by all drivers. + + + + +DVD_READ_STRUCT Read structure + + usage:: + + dvd_struct s; + + ioctl(fd, DVD_READ_STRUCT, &s); + + inputs: + dvd_struct structure, containing: + + =================== ========================================== + type specifies the information desired, one of + DVD_STRUCT_PHYSICAL, DVD_STRUCT_COPYRIGHT, + DVD_STRUCT_DISCKEY, DVD_STRUCT_BCA, + DVD_STRUCT_MANUFACT + physical.layer_num desired layer, indexed from 0 + copyright.layer_num desired layer, indexed from 0 + disckey.agid + =================== ========================================== + + outputs: + dvd_struct structure, containing: + + =================== ================================ + physical for type == DVD_STRUCT_PHYSICAL + copyright for type == DVD_STRUCT_COPYRIGHT + disckey.value for type == DVD_STRUCT_DISCKEY + bca.{len,value} for type == DVD_STRUCT_BCA + manufact.{len,valu} for type == DVD_STRUCT_MANUFACT + =================== ================================ + + error returns: + - EINVAL physical.layer_num exceeds number of layers + - EIO Received invalid response from drive + + + +DVD_WRITE_STRUCT Write structure + + Not implemented, as of 2.6.8.1 + + + +DVD_AUTH Authentication + + usage:: + + dvd_authinfo ai; + + ioctl(fd, DVD_AUTH, &ai); + + inputs: + dvd_authinfo structure. See <linux/cdrom.h> + + + outputs: + dvd_authinfo structure. + + + error return: + - ENOTTY ai.type not recognized. + + + +CDROM_SEND_PACKET + send a packet to the drive + + + usage:: + + struct cdrom_generic_command cgc; + + ioctl(fd, CDROM_SEND_PACKET, &cgc); + + inputs: + cdrom_generic_command structure containing the packet to send. + + + outputs: + none + + cdrom_generic_command structure containing results. + + error return: + - EIO + + command failed. + - EPERM + + Operation not permitted, either because a + write command was attempted on a drive which + is opened read-only, or because the command + requires CAP_SYS_RAWIO + - EINVAL + + cgc.data_direction not set + + + +CDROM_NEXT_WRITABLE + get next writable block + + + usage:: + + long next; + + ioctl(fd, CDROM_NEXT_WRITABLE, &next); + + inputs: + none + + + outputs: + The next writable block. + + + notes: + If the device does not support this ioctl directly, the + + ioctl will return CDROM_LAST_WRITTEN + 7. + + + +CDROM_LAST_WRITTEN + get last block written on disc + + + usage:: + + long last; + + ioctl(fd, CDROM_LAST_WRITTEN, &last); + + inputs: + none + + + outputs: + The last block written on disc + + + notes: + If the device does not support this ioctl directly, the + result is derived from the disc's table of contents. If the + table of contents can't be read, this ioctl returns an + error. diff --git a/Documentation/ioctl/cdrom.txt b/Documentation/ioctl/cdrom.txt deleted file mode 100644 index a4d62a9d6771..000000000000 --- a/Documentation/ioctl/cdrom.txt +++ /dev/null @@ -1,967 +0,0 @@ - Summary of CDROM ioctl calls. - ============================ - - Edward A. Falk <efalk@google.com> - - November, 2004 - -This document attempts to describe the ioctl(2) calls supported by -the CDROM layer. These are by-and-large implemented (as of Linux 2.6) -in drivers/cdrom/cdrom.c and drivers/block/scsi_ioctl.c - -ioctl values are listed in <linux/cdrom.h>. As of this writing, they -are as follows: - - CDROMPAUSE Pause Audio Operation - CDROMRESUME Resume paused Audio Operation - CDROMPLAYMSF Play Audio MSF (struct cdrom_msf) - CDROMPLAYTRKIND Play Audio Track/index (struct cdrom_ti) - CDROMREADTOCHDR Read TOC header (struct cdrom_tochdr) - CDROMREADTOCENTRY Read TOC entry (struct cdrom_tocentry) - CDROMSTOP Stop the cdrom drive - CDROMSTART Start the cdrom drive - CDROMEJECT Ejects the cdrom media - CDROMVOLCTRL Control output volume (struct cdrom_volctrl) - CDROMSUBCHNL Read subchannel data (struct cdrom_subchnl) - CDROMREADMODE2 Read CDROM mode 2 data (2336 Bytes) - (struct cdrom_read) - CDROMREADMODE1 Read CDROM mode 1 data (2048 Bytes) - (struct cdrom_read) - CDROMREADAUDIO (struct cdrom_read_audio) - CDROMEJECT_SW enable(1)/disable(0) auto-ejecting - CDROMMULTISESSION Obtain the start-of-last-session - address of multi session disks - (struct cdrom_multisession) - CDROM_GET_MCN Obtain the "Universal Product Code" - if available (struct cdrom_mcn) - CDROM_GET_UPC Deprecated, use CDROM_GET_MCN instead. - CDROMRESET hard-reset the drive - CDROMVOLREAD Get the drive's volume setting - (struct cdrom_volctrl) - CDROMREADRAW read data in raw mode (2352 Bytes) - (struct cdrom_read) - CDROMREADCOOKED read data in cooked mode - CDROMSEEK seek msf address - CDROMPLAYBLK scsi-cd only, (struct cdrom_blk) - CDROMREADALL read all 2646 bytes - CDROMGETSPINDOWN return 4-bit spindown value - CDROMSETSPINDOWN set 4-bit spindown value - CDROMCLOSETRAY pendant of CDROMEJECT - CDROM_SET_OPTIONS Set behavior options - CDROM_CLEAR_OPTIONS Clear behavior options - CDROM_SELECT_SPEED Set the CD-ROM speed - CDROM_SELECT_DISC Select disc (for juke-boxes) - CDROM_MEDIA_CHANGED Check is media changed - CDROM_DRIVE_STATUS Get tray position, etc. - CDROM_DISC_STATUS Get disc type, etc. - CDROM_CHANGER_NSLOTS Get number of slots - CDROM_LOCKDOOR lock or unlock door - CDROM_DEBUG Turn debug messages on/off - CDROM_GET_CAPABILITY get capabilities - CDROMAUDIOBUFSIZ set the audio buffer size - DVD_READ_STRUCT Read structure - DVD_WRITE_STRUCT Write structure - DVD_AUTH Authentication - CDROM_SEND_PACKET send a packet to the drive - CDROM_NEXT_WRITABLE get next writable block - CDROM_LAST_WRITTEN get last block written on disc - - -The information that follows was determined from reading kernel source -code. It is likely that some corrections will be made over time. - - - - - - - -General: - - Unless otherwise specified, all ioctl calls return 0 on success - and -1 with errno set to an appropriate value on error. (Some - ioctls return non-negative data values.) - - Unless otherwise specified, all ioctl calls return -1 and set - errno to EFAULT on a failed attempt to copy data to or from user - address space. - - Individual drivers may return error codes not listed here. - - Unless otherwise specified, all data structures and constants - are defined in <linux/cdrom.h> - - - - -CDROMPAUSE Pause Audio Operation - - usage: - - ioctl(fd, CDROMPAUSE, 0); - - inputs: none - - outputs: none - - error return: - ENOSYS cd drive not audio-capable. - - -CDROMRESUME Resume paused Audio Operation - - usage: - - ioctl(fd, CDROMRESUME, 0); - - inputs: none - - outputs: none - - error return: - ENOSYS cd drive not audio-capable. - - -CDROMPLAYMSF Play Audio MSF (struct cdrom_msf) - - usage: - - struct cdrom_msf msf; - ioctl(fd, CDROMPLAYMSF, &msf); - - inputs: - cdrom_msf structure, describing a segment of music to play - - outputs: none - - error return: - ENOSYS cd drive not audio-capable. - - notes: - MSF stands for minutes-seconds-frames - LBA stands for logical block address - - Segment is described as start and end times, where each time - is described as minutes:seconds:frames. A frame is 1/75 of - a second. - - -CDROMPLAYTRKIND Play Audio Track/index (struct cdrom_ti) - - usage: - - struct cdrom_ti ti; - ioctl(fd, CDROMPLAYTRKIND, &ti); - - inputs: - cdrom_ti structure, describing a segment of music to play - - outputs: none - - error return: - ENOSYS cd drive not audio-capable. - - notes: - Segment is described as start and end times, where each time - is described as a track and an index. - - - -CDROMREADTOCHDR Read TOC header (struct cdrom_tochdr) - - usage: - - cdrom_tochdr header; - ioctl(fd, CDROMREADTOCHDR, &header); - - inputs: - cdrom_tochdr structure - - outputs: - cdrom_tochdr structure - - error return: - ENOSYS cd drive not audio-capable. - - - -CDROMREADTOCENTRY Read TOC entry (struct cdrom_tocentry) - - usage: - - struct cdrom_tocentry entry; - ioctl(fd, CDROMREADTOCENTRY, &entry); - - inputs: - cdrom_tocentry structure - - outputs: - cdrom_tocentry structure - - error return: - ENOSYS cd drive not audio-capable. - EINVAL entry.cdte_format not CDROM_MSF or CDROM_LBA - EINVAL requested track out of bounds - EIO I/O error reading TOC - - notes: - TOC stands for Table Of Contents - MSF stands for minutes-seconds-frames - LBA stands for logical block address - - - -CDROMSTOP Stop the cdrom drive - - usage: - - ioctl(fd, CDROMSTOP, 0); - - inputs: none - - outputs: none - - error return: - ENOSYS cd drive not audio-capable. - - notes: - Exact interpretation of this ioctl depends on the device, - but most seem to spin the drive down. - - -CDROMSTART Start the cdrom drive - - usage: - - ioctl(fd, CDROMSTART, 0); - - inputs: none - - outputs: none - - error return: - ENOSYS cd drive not audio-capable. - - notes: - Exact interpretation of this ioctl depends on the device, - but most seem to spin the drive up and/or close the tray. - Other devices ignore the ioctl completely. - - -CDROMEJECT Ejects the cdrom media - - usage: - - ioctl(fd, CDROMEJECT, 0); - - inputs: none - - outputs: none - - error returns: - ENOSYS cd drive not capable of ejecting - EBUSY other processes are accessing drive, or door is locked - - notes: - See CDROM_LOCKDOOR, below. - - - -CDROMCLOSETRAY pendant of CDROMEJECT - - usage: - - ioctl(fd, CDROMCLOSETRAY, 0); - - inputs: none - - outputs: none - - error returns: - ENOSYS cd drive not capable of closing the tray - EBUSY other processes are accessing drive, or door is locked - - notes: - See CDROM_LOCKDOOR, below. - - - -CDROMVOLCTRL Control output volume (struct cdrom_volctrl) - - usage: - - struct cdrom_volctrl volume; - ioctl(fd, CDROMVOLCTRL, &volume); - - inputs: - cdrom_volctrl structure containing volumes for up to 4 - channels. - - outputs: none - - error return: - ENOSYS cd drive not audio-capable. - - - -CDROMVOLREAD Get the drive's volume setting - (struct cdrom_volctrl) - - usage: - - struct cdrom_volctrl volume; - ioctl(fd, CDROMVOLREAD, &volume); - - inputs: none - - outputs: - The current volume settings. - - error return: - ENOSYS cd drive not audio-capable. - - - -CDROMSUBCHNL Read subchannel data (struct cdrom_subchnl) - - usage: - - struct cdrom_subchnl q; - ioctl(fd, CDROMSUBCHNL, &q); - - inputs: - cdrom_subchnl structure - - outputs: - cdrom_subchnl structure - - error return: - ENOSYS cd drive not audio-capable. - EINVAL format not CDROM_MSF or CDROM_LBA - - notes: - Format is converted to CDROM_MSF or CDROM_LBA - as per user request on return - - - -CDROMREADRAW read data in raw mode (2352 Bytes) - (struct cdrom_read) - - usage: - - union { - struct cdrom_msf msf; /* input */ - char buffer[CD_FRAMESIZE_RAW]; /* return */ - } arg; - ioctl(fd, CDROMREADRAW, &arg); - - inputs: - cdrom_msf structure indicating an address to read. - Only the start values are significant. - - outputs: - Data written to address provided by user. - - error return: - EINVAL address less than 0, or msf less than 0:2:0 - ENOMEM out of memory - - notes: - As of 2.6.8.1, comments in <linux/cdrom.h> indicate that this - ioctl accepts a cdrom_read structure, but actual source code - reads a cdrom_msf structure and writes a buffer of data to - the same address. - - MSF values are converted to LBA values via this formula: - - lba = (((m * CD_SECS) + s) * CD_FRAMES + f) - CD_MSF_OFFSET; - - - - -CDROMREADMODE1 Read CDROM mode 1 data (2048 Bytes) - (struct cdrom_read) - - notes: - Identical to CDROMREADRAW except that block size is - CD_FRAMESIZE (2048) bytes - - - -CDROMREADMODE2 Read CDROM mode 2 data (2336 Bytes) - (struct cdrom_read) - - notes: - Identical to CDROMREADRAW except that block size is - CD_FRAMESIZE_RAW0 (2336) bytes - - - -CDROMREADAUDIO (struct cdrom_read_audio) - - usage: - - struct cdrom_read_audio ra; - ioctl(fd, CDROMREADAUDIO, &ra); - - inputs: - cdrom_read_audio structure containing read start - point and length - - outputs: - audio data, returned to buffer indicated by ra - - error return: - EINVAL format not CDROM_MSF or CDROM_LBA - EINVAL nframes not in range [1 75] - ENXIO drive has no queue (probably means invalid fd) - ENOMEM out of memory - - -CDROMEJECT_SW enable(1)/disable(0) auto-ejecting - - usage: - - int val; - ioctl(fd, CDROMEJECT_SW, val); - - inputs: - Flag specifying auto-eject flag. - - outputs: none - - error return: - ENOSYS Drive is not capable of ejecting. - EBUSY Door is locked - - - - -CDROMMULTISESSION Obtain the start-of-last-session - address of multi session disks - (struct cdrom_multisession) - usage: - - struct cdrom_multisession ms_info; - ioctl(fd, CDROMMULTISESSION, &ms_info); - - inputs: - cdrom_multisession structure containing desired - format. - - outputs: - cdrom_multisession structure is filled with last_session - information. - - error return: - EINVAL format not CDROM_MSF or CDROM_LBA - - -CDROM_GET_MCN Obtain the "Universal Product Code" - if available (struct cdrom_mcn) - - usage: - - struct cdrom_mcn mcn; - ioctl(fd, CDROM_GET_MCN, &mcn); - - inputs: none - - outputs: - Universal Product Code - - error return: - ENOSYS Drive is not capable of reading MCN data. - - notes: - Source code comments state: - - The following function is implemented, although very few - audio discs give Universal Product Code information, which - should just be the Medium Catalog Number on the box. Note, - that the way the code is written on the CD is /not/ uniform - across all discs! - - - - -CDROM_GET_UPC CDROM_GET_MCN (deprecated) - - Not implemented, as of 2.6.8.1 - - - -CDROMRESET hard-reset the drive - - usage: - - ioctl(fd, CDROMRESET, 0); - - inputs: none - - outputs: none - - error return: - EACCES Access denied: requires CAP_SYS_ADMIN - ENOSYS Drive is not capable of resetting. - - - - -CDROMREADCOOKED read data in cooked mode - - usage: - - u8 buffer[CD_FRAMESIZE] - ioctl(fd, CDROMREADCOOKED, buffer); - - inputs: none - - outputs: - 2048 bytes of data, "cooked" mode. - - notes: - Not implemented on all drives. - - - - -CDROMREADALL read all 2646 bytes - - Same as CDROMREADCOOKED, but reads 2646 bytes. - - - -CDROMSEEK seek msf address - - usage: - - struct cdrom_msf msf; - ioctl(fd, CDROMSEEK, &msf); - - inputs: - MSF address to seek to. - - outputs: none - - - -CDROMPLAYBLK scsi-cd only, (struct cdrom_blk) - - usage: - - struct cdrom_blk blk; - ioctl(fd, CDROMPLAYBLK, &blk); - - inputs: - Region to play - - outputs: none - - - -CDROMGETSPINDOWN - - usage: - - char spindown; - ioctl(fd, CDROMGETSPINDOWN, &spindown); - - inputs: none - - outputs: - The value of the current 4-bit spindown value. - - - - -CDROMSETSPINDOWN - - usage: - - char spindown - ioctl(fd, CDROMSETSPINDOWN, &spindown); - - inputs: - 4-bit value used to control spindown (TODO: more detail here) - - outputs: none - - - - - -CDROM_SET_OPTIONS Set behavior options - - usage: - - int options; - ioctl(fd, CDROM_SET_OPTIONS, options); - - inputs: - New values for drive options. The logical 'or' of: - CDO_AUTO_CLOSE close tray on first open(2) - CDO_AUTO_EJECT open tray on last release - CDO_USE_FFLAGS use O_NONBLOCK information on open - CDO_LOCK lock tray on open files - CDO_CHECK_TYPE check type on open for data - - outputs: - Returns the resulting options settings in the - ioctl return value. Returns -1 on error. - - error return: - ENOSYS selected option(s) not supported by drive. - - - - -CDROM_CLEAR_OPTIONS Clear behavior options - - Same as CDROM_SET_OPTIONS, except that selected options are - turned off. - - - -CDROM_SELECT_SPEED Set the CD-ROM speed - - usage: - - int speed; - ioctl(fd, CDROM_SELECT_SPEED, speed); - - inputs: - New drive speed. - - outputs: none - - error return: - ENOSYS speed selection not supported by drive. - - - -CDROM_SELECT_DISC Select disc (for juke-boxes) - - usage: - - int disk; - ioctl(fd, CDROM_SELECT_DISC, disk); - - inputs: - Disk to load into drive. - - outputs: none - - error return: - EINVAL Disk number beyond capacity of drive - - - -CDROM_MEDIA_CHANGED Check is media changed - - usage: - - int slot; - ioctl(fd, CDROM_MEDIA_CHANGED, slot); - - inputs: - Slot number to be tested, always zero except for jukeboxes. - May also be special values CDSL_NONE or CDSL_CURRENT - - outputs: - Ioctl return value is 0 or 1 depending on whether the media - has been changed, or -1 on error. - - error returns: - ENOSYS Drive can't detect media change - EINVAL Slot number beyond capacity of drive - ENOMEM Out of memory - - - -CDROM_DRIVE_STATUS Get tray position, etc. - - usage: - - int slot; - ioctl(fd, CDROM_DRIVE_STATUS, slot); - - inputs: - Slot number to be tested, always zero except for jukeboxes. - May also be special values CDSL_NONE or CDSL_CURRENT - - outputs: - Ioctl return value will be one of the following values - from <linux/cdrom.h>: - - CDS_NO_INFO Information not available. - CDS_NO_DISC - CDS_TRAY_OPEN - CDS_DRIVE_NOT_READY - CDS_DISC_OK - -1 error - - error returns: - ENOSYS Drive can't detect drive status - EINVAL Slot number beyond capacity of drive - ENOMEM Out of memory - - - - -CDROM_DISC_STATUS Get disc type, etc. - - usage: - - ioctl(fd, CDROM_DISC_STATUS, 0); - - inputs: none - - outputs: - Ioctl return value will be one of the following values - from <linux/cdrom.h>: - CDS_NO_INFO - CDS_AUDIO - CDS_MIXED - CDS_XA_2_2 - CDS_XA_2_1 - CDS_DATA_1 - - error returns: none at present - - notes: - Source code comments state: - - Ok, this is where problems start. The current interface for - the CDROM_DISC_STATUS ioctl is flawed. It makes the false - assumption that CDs are all CDS_DATA_1 or all CDS_AUDIO, etc. - Unfortunately, while this is often the case, it is also - very common for CDs to have some tracks with data, and some - tracks with audio. Just because I feel like it, I declare - the following to be the best way to cope. If the CD has - ANY data tracks on it, it will be returned as a data CD. - If it has any XA tracks, I will return it as that. Now I - could simplify this interface by combining these returns with - the above, but this more clearly demonstrates the problem - with the current interface. Too bad this wasn't designed - to use bitmasks... -Erik - - Well, now we have the option CDS_MIXED: a mixed-type CD. - User level programmers might feel the ioctl is not very - useful. - ---david - - - - -CDROM_CHANGER_NSLOTS Get number of slots - - usage: - - ioctl(fd, CDROM_CHANGER_NSLOTS, 0); - - inputs: none - - outputs: - The ioctl return value will be the number of slots in a - CD changer. Typically 1 for non-multi-disk devices. - - error returns: none - - - -CDROM_LOCKDOOR lock or unlock door - - usage: - - int lock; - ioctl(fd, CDROM_LOCKDOOR, lock); - - inputs: - Door lock flag, 1=lock, 0=unlock - - outputs: none - - error returns: - EDRIVE_CANT_DO_THIS Door lock function not supported. - EBUSY Attempt to unlock when multiple users - have the drive open and not CAP_SYS_ADMIN - - notes: - As of 2.6.8.1, the lock flag is a global lock, meaning that - all CD drives will be locked or unlocked together. This is - probably a bug. - - The EDRIVE_CANT_DO_THIS value is defined in <linux/cdrom.h> - and is currently (2.6.8.1) the same as EOPNOTSUPP - - - -CDROM_DEBUG Turn debug messages on/off - - usage: - - int debug; - ioctl(fd, CDROM_DEBUG, debug); - - inputs: - Cdrom debug flag, 0=disable, 1=enable - - outputs: - The ioctl return value will be the new debug flag. - - error return: - EACCES Access denied: requires CAP_SYS_ADMIN - - - -CDROM_GET_CAPABILITY get capabilities - - usage: - - ioctl(fd, CDROM_GET_CAPABILITY, 0); - - inputs: none - - outputs: - The ioctl return value is the current device capability - flags. See CDC_CLOSE_TRAY, CDC_OPEN_TRAY, etc. - - - -CDROMAUDIOBUFSIZ set the audio buffer size - - usage: - - int arg; - ioctl(fd, CDROMAUDIOBUFSIZ, val); - - inputs: - New audio buffer size - - outputs: - The ioctl return value is the new audio buffer size, or -1 - on error. - - error return: - ENOSYS Not supported by this driver. - - notes: - Not supported by all drivers. - - - -DVD_READ_STRUCT Read structure - - usage: - - dvd_struct s; - ioctl(fd, DVD_READ_STRUCT, &s); - - inputs: - dvd_struct structure, containing: - type specifies the information desired, one of - DVD_STRUCT_PHYSICAL, DVD_STRUCT_COPYRIGHT, - DVD_STRUCT_DISCKEY, DVD_STRUCT_BCA, - DVD_STRUCT_MANUFACT - physical.layer_num desired layer, indexed from 0 - copyright.layer_num desired layer, indexed from 0 - disckey.agid - - outputs: - dvd_struct structure, containing: - physical for type == DVD_STRUCT_PHYSICAL - copyright for type == DVD_STRUCT_COPYRIGHT - disckey.value for type == DVD_STRUCT_DISCKEY - bca.{len,value} for type == DVD_STRUCT_BCA - manufact.{len,valu} for type == DVD_STRUCT_MANUFACT - - error returns: - EINVAL physical.layer_num exceeds number of layers - EIO Received invalid response from drive - - - -DVD_WRITE_STRUCT Write structure - - Not implemented, as of 2.6.8.1 - - - -DVD_AUTH Authentication - - usage: - - dvd_authinfo ai; - ioctl(fd, DVD_AUTH, &ai); - - inputs: - dvd_authinfo structure. See <linux/cdrom.h> - - outputs: - dvd_authinfo structure. - - error return: - ENOTTY ai.type not recognized. - - - -CDROM_SEND_PACKET send a packet to the drive - - usage: - - struct cdrom_generic_command cgc; - ioctl(fd, CDROM_SEND_PACKET, &cgc); - - inputs: - cdrom_generic_command structure containing the packet to send. - - outputs: none - cdrom_generic_command structure containing results. - - error return: - EIO command failed. - EPERM Operation not permitted, either because a - write command was attempted on a drive which - is opened read-only, or because the command - requires CAP_SYS_RAWIO - EINVAL cgc.data_direction not set - - - -CDROM_NEXT_WRITABLE get next writable block - - usage: - - long next; - ioctl(fd, CDROM_NEXT_WRITABLE, &next); - - inputs: none - - outputs: - The next writable block. - - notes: - If the device does not support this ioctl directly, the - ioctl will return CDROM_LAST_WRITTEN + 7. - - - -CDROM_LAST_WRITTEN get last block written on disc - - usage: - - long last; - ioctl(fd, CDROM_LAST_WRITTEN, &last); - - inputs: none - - outputs: - The last block written on disc - - notes: - If the device does not support this ioctl directly, the - result is derived from the disc's table of contents. If the - table of contents can't be read, this ioctl returns an - error. diff --git a/Documentation/ioctl/hdio.txt b/Documentation/ioctl/hdio.rst index 18eb98c44ffe..e822e3dff176 100644 --- a/Documentation/ioctl/hdio.txt +++ b/Documentation/ioctl/hdio.rst @@ -1,9 +1,10 @@ - Summary of HDIO_ ioctl calls. - ============================ +============================== +Summary of `HDIO_` ioctl calls +============================== - Edward A. Falk <efalk@google.com> +- Edward A. Falk <efalk@google.com> - November, 2004 +November, 2004 This document attempts to describe the ioctl(2) calls supported by the HD/IDE layer. These are by-and-large implemented (as of Linux 2.6) @@ -14,6 +15,7 @@ are as follows: ioctls that pass argument pointers to user space: + ======================= ======================================= HDIO_GETGEO get device geometry HDIO_GET_UNMASKINTR get current unmask setting HDIO_GET_MULTCOUNT get current IDE blockmode setting @@ -36,9 +38,11 @@ are as follows: HDIO_DRIVE_TASK execute task and special drive command HDIO_DRIVE_CMD execute a special drive command HDIO_DRIVE_CMD_AEB HDIO_DRIVE_TASK + ======================= ======================================= ioctls that pass non-pointer values: + ======================= ======================================= HDIO_SET_MULTCOUNT change IDE blockmode HDIO_SET_UNMASKINTR permit other irqs during I/O HDIO_SET_KEEPSETTINGS keep ioctl settings on reset @@ -57,16 +61,13 @@ are as follows: HDIO_SET_IDE_SCSI Set scsi emulation mode on/off HDIO_SET_SCSI_IDE not implemented yet + ======================= ======================================= The information that follows was determined from reading kernel source code. It is likely that some corrections will be made over time. - - - - - +------------------------------------------------------------------------------ General: @@ -80,459 +81,610 @@ General: Unless otherwise specified, all data structures and constants are defined in <linux/hdreg.h> +------------------------------------------------------------------------------ +HDIO_GETGEO + get device geometry -HDIO_GETGEO get device geometry - usage: + usage:: struct hd_geometry geom; + ioctl(fd, HDIO_GETGEO, &geom); - inputs: none + inputs: + none + + outputs: + hd_geometry structure containing: - hd_geometry structure containing: + ========= ================================== heads number of heads sectors number of sectors/track cylinders number of cylinders, mod 65536 start starting sector of this partition. + ========= ================================== error returns: - EINVAL if the device is not a disk drive or floppy drive, - or if the user passes a null pointer + - EINVAL + + if the device is not a disk drive or floppy drive, + or if the user passes a null pointer notes: + Not particularly useful with modern disk drives, whose geometry + is a polite fiction anyway. Modern drives are addressed + purely by sector number nowadays (lba addressing), and the + drive geometry is an abstraction which is actually subject + to change. Currently (as of Nov 2004), the geometry values + are the "bios" values -- presumably the values the drive had + when Linux first booted. - Not particularly useful with modern disk drives, whose geometry - is a polite fiction anyway. Modern drives are addressed - purely by sector number nowadays (lba addressing), and the - drive geometry is an abstraction which is actually subject - to change. Currently (as of Nov 2004), the geometry values - are the "bios" values -- presumably the values the drive had - when Linux first booted. + In addition, the cylinders field of the hd_geometry is an + unsigned short, meaning that on most architectures, this + ioctl will not return a meaningful value on drives with more + than 65535 tracks. - In addition, the cylinders field of the hd_geometry is an - unsigned short, meaning that on most architectures, this - ioctl will not return a meaningful value on drives with more - than 65535 tracks. + The start field is unsigned long, meaning that it will not + contain a meaningful value for disks over 219 Gb in size. - The start field is unsigned long, meaning that it will not - contain a meaningful value for disks over 219 Gb in size. +HDIO_GET_UNMASKINTR + get current unmask setting -HDIO_GET_UNMASKINTR get current unmask setting - usage: + usage:: long val; + ioctl(fd, HDIO_GET_UNMASKINTR, &val); - inputs: none + inputs: + none + + outputs: - The value of the drive's current unmask setting + The value of the drive's current unmask setting -HDIO_SET_UNMASKINTR permit other irqs during I/O - usage: + +HDIO_SET_UNMASKINTR + permit other irqs during I/O + + + usage:: unsigned long val; + ioctl(fd, HDIO_SET_UNMASKINTR, val); inputs: - New value for unmask flag + New value for unmask flag + + + + outputs: + none + - outputs: none error return: - EINVAL (bdev != bdev->bd_contains) (not sure what this means) - EACCES Access denied: requires CAP_SYS_ADMIN - EINVAL value out of range [0 1] - EBUSY Controller busy + - EINVAL (bdev != bdev->bd_contains) (not sure what this means) + - EACCES Access denied: requires CAP_SYS_ADMIN + - EINVAL value out of range [0 1] + - EBUSY Controller busy + +HDIO_GET_MULTCOUNT + get current IDE blockmode setting -HDIO_GET_MULTCOUNT get current IDE blockmode setting - usage: + usage:: long val; + ioctl(fd, HDIO_GET_MULTCOUNT, &val); - inputs: none + inputs: + none + + outputs: - The value of the current IDE block mode setting. This - controls how many sectors the drive will transfer per - interrupt. + The value of the current IDE block mode setting. This + controls how many sectors the drive will transfer per + interrupt. + +HDIO_SET_MULTCOUNT + change IDE blockmode -HDIO_SET_MULTCOUNT change IDE blockmode - usage: + usage:: int val; + ioctl(fd, HDIO_SET_MULTCOUNT, val); inputs: - New value for IDE block mode setting. This controls how many - sectors the drive will transfer per interrupt. + New value for IDE block mode setting. This controls how many + sectors the drive will transfer per interrupt. + + outputs: + none + - outputs: none error return: - EINVAL (bdev != bdev->bd_contains) (not sure what this means) - EACCES Access denied: requires CAP_SYS_ADMIN - EINVAL value out of range supported by disk. - EBUSY Controller busy or blockmode already set. - EIO Drive did not accept new block mode. + - EINVAL (bdev != bdev->bd_contains) (not sure what this means) + - EACCES Access denied: requires CAP_SYS_ADMIN + - EINVAL value out of range supported by disk. + - EBUSY Controller busy or blockmode already set. + - EIO Drive did not accept new block mode. notes: - - Source code comments read: + Source code comments read:: This is tightly woven into the driver->do_special cannot touch. DON'T do it again until a total personality rewrite is committed. If blockmode has already been set, this ioctl will fail with - EBUSY + -EBUSY -HDIO_GET_QDMA get use-qdma flag +HDIO_GET_QDMA + get use-qdma flag + Not implemented, as of 2.6.8.1 -HDIO_SET_XFER set transfer rate via proc +HDIO_SET_XFER + set transfer rate via proc + Not implemented, as of 2.6.8.1 -HDIO_OBSOLETE_IDENTITY OBSOLETE, DO NOT USE +HDIO_OBSOLETE_IDENTITY + OBSOLETE, DO NOT USE + Same as HDIO_GET_IDENTITY (see below), except that it only returns the first 142 bytes of drive identity information. -HDIO_GET_IDENTITY get IDE identification info +HDIO_GET_IDENTITY + get IDE identification info + - usage: + usage:: unsigned char identity[512]; + ioctl(fd, HDIO_GET_IDENTITY, identity); - inputs: none + inputs: + none - outputs: - ATA drive identity information. For full description, see - the IDENTIFY DEVICE and IDENTIFY PACKET DEVICE commands in - the ATA specification. + + outputs: + ATA drive identity information. For full description, see + the IDENTIFY DEVICE and IDENTIFY PACKET DEVICE commands in + the ATA specification. error returns: - EINVAL (bdev != bdev->bd_contains) (not sure what this means) - ENOMSG IDENTIFY DEVICE information not available + - EINVAL (bdev != bdev->bd_contains) (not sure what this means) + - ENOMSG IDENTIFY DEVICE information not available notes: + Returns information that was obtained when the drive was + probed. Some of this information is subject to change, and + this ioctl does not re-probe the drive to update the + information. - Returns information that was obtained when the drive was - probed. Some of this information is subject to change, and - this ioctl does not re-probe the drive to update the - information. + This information is also available from /proc/ide/hdX/identify - This information is also available from /proc/ide/hdX/identify +HDIO_GET_KEEPSETTINGS + get keep-settings-on-reset flag -HDIO_GET_KEEPSETTINGS get keep-settings-on-reset flag - usage: + usage:: long val; + ioctl(fd, HDIO_GET_KEEPSETTINGS, &val); - inputs: none + inputs: + none + + outputs: - The value of the current "keep settings" flag + The value of the current "keep settings" flag + + notes: + When set, indicates that kernel should restore settings + after a drive reset. - When set, indicates that kernel should restore settings - after a drive reset. +HDIO_SET_KEEPSETTINGS + keep ioctl settings on reset -HDIO_SET_KEEPSETTINGS keep ioctl settings on reset - usage: + usage:: long val; + ioctl(fd, HDIO_SET_KEEPSETTINGS, val); inputs: - New value for keep_settings flag + New value for keep_settings flag + + + + outputs: + none + - outputs: none error return: - EINVAL (bdev != bdev->bd_contains) (not sure what this means) - EACCES Access denied: requires CAP_SYS_ADMIN - EINVAL value out of range [0 1] - EBUSY Controller busy + - EINVAL (bdev != bdev->bd_contains) (not sure what this means) + - EACCES Access denied: requires CAP_SYS_ADMIN + - EINVAL value out of range [0 1] + - EBUSY Controller busy + +HDIO_GET_32BIT + get current io_32bit setting -HDIO_GET_32BIT get current io_32bit setting - usage: + usage:: long val; + ioctl(fd, HDIO_GET_32BIT, &val); - inputs: none + inputs: + none + + outputs: - The value of the current io_32bit setting + The value of the current io_32bit setting + + notes: + 0=16-bit, 1=32-bit, 2,3 = 32bit+sync + - 0=16-bit, 1=32-bit, 2,3 = 32bit+sync -HDIO_GET_NOWERR get ignore-write-error flag +HDIO_GET_NOWERR + get ignore-write-error flag - usage: + + usage:: long val; + ioctl(fd, HDIO_GET_NOWERR, &val); - inputs: none + inputs: + none + + outputs: - The value of the current ignore-write-error flag + The value of the current ignore-write-error flag -HDIO_GET_DMA get use-dma flag - usage: + +HDIO_GET_DMA + get use-dma flag + + + usage:: long val; + ioctl(fd, HDIO_GET_DMA, &val); - inputs: none + inputs: + none + + outputs: - The value of the current use-dma flag + The value of the current use-dma flag -HDIO_GET_NICE get nice flags - usage: + +HDIO_GET_NICE + get nice flags + + + usage:: long nice; + ioctl(fd, HDIO_GET_NICE, &nice); - inputs: none + inputs: + none + + outputs: + The drive's "nice" values. + - The drive's "nice" values. notes: + Per-drive flags which determine when the system will give more + bandwidth to other devices sharing the same IDE bus. - Per-drive flags which determine when the system will give more - bandwidth to other devices sharing the same IDE bus. - See <linux/hdreg.h>, near symbol IDE_NICE_DSC_OVERLAP. + See <linux/hdreg.h>, near symbol IDE_NICE_DSC_OVERLAP. -HDIO_SET_NICE set nice flags +HDIO_SET_NICE + set nice flags - usage: + + usage:: unsigned long nice; + ... ioctl(fd, HDIO_SET_NICE, nice); inputs: - bitmask of nice flags. + bitmask of nice flags. + + + + outputs: + none + - outputs: none error returns: - EACCES Access denied: requires CAP_SYS_ADMIN - EPERM Flags other than DSC_OVERLAP and NICE_1 set. - EPERM DSC_OVERLAP specified but not supported by drive + - EACCES Access denied: requires CAP_SYS_ADMIN + - EPERM Flags other than DSC_OVERLAP and NICE_1 set. + - EPERM DSC_OVERLAP specified but not supported by drive notes: + This ioctl sets the DSC_OVERLAP and NICE_1 flags from values + provided by the user. - This ioctl sets the DSC_OVERLAP and NICE_1 flags from values - provided by the user. + Nice flags are listed in <linux/hdreg.h>, starting with + IDE_NICE_DSC_OVERLAP. These values represent shifts. - Nice flags are listed in <linux/hdreg.h>, starting with - IDE_NICE_DSC_OVERLAP. These values represent shifts. +HDIO_GET_WCACHE + get write cache mode on|off -HDIO_GET_WCACHE get write cache mode on|off - usage: + usage:: long val; + ioctl(fd, HDIO_GET_WCACHE, &val); - inputs: none + inputs: + none + + outputs: - The value of the current write cache mode + The value of the current write cache mode -HDIO_GET_ACOUSTIC get acoustic value - usage: + +HDIO_GET_ACOUSTIC + get acoustic value + + + usage:: long val; + ioctl(fd, HDIO_GET_ACOUSTIC, &val); - inputs: none + inputs: + none + + outputs: - The value of the current acoustic settings + The value of the current acoustic settings + + notes: + See HDIO_SET_ACOUSTIC + - See HDIO_SET_ACOUSTIC HDIO_GET_ADDRESS + usage:: - usage: long val; + ioctl(fd, HDIO_GET_ADDRESS, &val); - inputs: none + inputs: + none + + outputs: - The value of the current addressing mode: - 0 = 28-bit - 1 = 48-bit - 2 = 48-bit doing 28-bit - 3 = 64-bit + The value of the current addressing mode: + + = =================== + 0 28-bit + 1 48-bit + 2 48-bit doing 28-bit + 3 64-bit + = =================== -HDIO_GET_BUSSTATE get the bus state of the hwif +HDIO_GET_BUSSTATE + get the bus state of the hwif - usage: + + usage:: long state; + ioctl(fd, HDIO_SCAN_HWIF, &state); - inputs: none + inputs: + none + + outputs: - Current power state of the IDE bus. One of BUSSTATE_OFF, - BUSSTATE_ON, or BUSSTATE_TRISTATE + Current power state of the IDE bus. One of BUSSTATE_OFF, + BUSSTATE_ON, or BUSSTATE_TRISTATE error returns: - EACCES Access denied: requires CAP_SYS_ADMIN + - EACCES Access denied: requires CAP_SYS_ADMIN -HDIO_SET_BUSSTATE set the bus state of the hwif +HDIO_SET_BUSSTATE + set the bus state of the hwif - usage: + + usage:: int state; + ... ioctl(fd, HDIO_SCAN_HWIF, state); inputs: - Desired IDE power state. One of BUSSTATE_OFF, BUSSTATE_ON, - or BUSSTATE_TRISTATE + Desired IDE power state. One of BUSSTATE_OFF, BUSSTATE_ON, + or BUSSTATE_TRISTATE + + outputs: + none + - outputs: none error returns: - EACCES Access denied: requires CAP_SYS_RAWIO - EOPNOTSUPP Hardware interface does not support bus power control + - EACCES Access denied: requires CAP_SYS_RAWIO + - EOPNOTSUPP Hardware interface does not support bus power control + +HDIO_TRISTATE_HWIF + execute a channel tristate -HDIO_TRISTATE_HWIF execute a channel tristate Not implemented, as of 2.6.8.1. See HDIO_SET_BUSSTATE -HDIO_DRIVE_RESET execute a device reset +HDIO_DRIVE_RESET + execute a device reset + - usage: + usage:: int args[3] + ... ioctl(fd, HDIO_DRIVE_RESET, args); - inputs: none + inputs: + none + + + + outputs: + none + - outputs: none error returns: - EACCES Access denied: requires CAP_SYS_ADMIN - ENXIO No such device: phy dead or ctl_addr == 0 - EIO I/O error: reset timed out or hardware error + - EACCES Access denied: requires CAP_SYS_ADMIN + - ENXIO No such device: phy dead or ctl_addr == 0 + - EIO I/O error: reset timed out or hardware error notes: - Execute a reset on the device as soon as the current IO - operation has completed. + - Execute a reset on the device as soon as the current IO + operation has completed. - Executes an ATAPI soft reset if applicable, otherwise - executes an ATA soft reset on the controller. + - Executes an ATAPI soft reset if applicable, otherwise + executes an ATA soft reset on the controller. -HDIO_DRIVE_TASKFILE execute raw taskfile +HDIO_DRIVE_TASKFILE + execute raw taskfile - Note: If you don't have a copy of the ANSI ATA specification - handy, you should probably ignore this ioctl. - Execute an ATA disk command directly by writing the "taskfile" - registers of the drive. Requires ADMIN and RAWIO access - privileges. + Note: + If you don't have a copy of the ANSI ATA specification + handy, you should probably ignore this ioctl. + + - Execute an ATA disk command directly by writing the "taskfile" + registers of the drive. Requires ADMIN and RAWIO access + privileges. - usage: + usage:: struct { + ide_task_request_t req_task; u8 outbuf[OUTPUT_SIZE]; u8 inbuf[INPUT_SIZE]; @@ -548,6 +700,7 @@ HDIO_DRIVE_TASKFILE execute raw taskfile (See below for details on memory area passed to ioctl.) + ============ =================================================== io_ports[8] values to be written to taskfile registers hob_ports[8] high-order bytes, for extended commands. out_flags flags indicating which registers are valid @@ -557,24 +710,29 @@ HDIO_DRIVE_TASKFILE execute raw taskfile out_size size of output buffer outbuf buffer of data to be transmitted to disk inbuf buffer of data to be received from disk (see [1]) + ============ =================================================== outputs: + =========== ==================================================== io_ports[] values returned in the taskfile registers hob_ports[] high-order bytes, for extended commands. out_flags flags indicating which registers are valid (see [2]) in_flags flags indicating which registers should be returned outbuf buffer of data to be transmitted to disk (see [1]) inbuf buffer of data to be received from disk + =========== ==================================================== error returns: - EACCES CAP_SYS_ADMIN or CAP_SYS_RAWIO privilege not set. - ENOMSG Device is not a disk drive. - ENOMEM Unable to allocate memory for task - EFAULT req_cmd == TASKFILE_IN_OUT (not implemented as of 2.6.8) - EPERM req_cmd == TASKFILE_MULTI_OUT and drive - multi-count not yet set. - EIO Drive failed the command. + - EACCES CAP_SYS_ADMIN or CAP_SYS_RAWIO privilege not set. + - ENOMSG Device is not a disk drive. + - ENOMEM Unable to allocate memory for task + - EFAULT req_cmd == TASKFILE_IN_OUT (not implemented as of 2.6.8) + - EPERM + + req_cmd == TASKFILE_MULTI_OUT and drive + multi-count not yet set. + - EIO Drive failed the command. notes: @@ -615,22 +773,25 @@ HDIO_DRIVE_TASKFILE execute raw taskfile Command is passed to the disk drive via the ide_task_request_t structure, which contains these fields: + ============ =============================================== io_ports[8] values for the taskfile registers hob_ports[8] high-order bytes, for extended commands out_flags flags indicating which entries in the - io_ports[] and hob_ports[] arrays + io_ports[] and hob_ports[] arrays contain valid values. Type ide_reg_valid_t. in_flags flags indicating which entries in the - io_ports[] and hob_ports[] arrays + io_ports[] and hob_ports[] arrays are expected to contain valid values on return. data_phase See below req_cmd Command type, see below out_size output (user->drive) buffer size, bytes in_size input (drive->user) buffer size, bytes + ============ =============================================== When out_flags is zero, the following registers are loaded. + ============ =============================================== HOB_FEATURE If the drive supports LBA48 HOB_NSECTOR If the drive supports LBA48 HOB_SECTOR If the drive supports LBA48 @@ -644,9 +805,11 @@ HDIO_DRIVE_TASKFILE execute raw taskfile SELECT First, masked with 0xE0 if LBA48, 0xEF otherwise; then, or'ed with the default value of SELECT. + ============ =============================================== If any bit in out_flags is set, the following registers are loaded. + ============ =============================================== HOB_DATA If out_flags.b.data is set. HOB_DATA will travel on DD8-DD15 on little endian machines and on DD0-DD7 on big endian machines. @@ -664,6 +827,7 @@ HDIO_DRIVE_TASKFILE execute raw taskfile HCYL If out_flags.b.hcyl is set SELECT Or'ed with the default value of SELECT and loaded regardless of out_flags.b.select. + ============ =============================================== Taskfile registers are read back from the drive into {io|hob}_ports[] after the command completes iff one of the @@ -674,6 +838,7 @@ HDIO_DRIVE_TASKFILE execute raw taskfile 2. One or more than one bits are set in out_flags. 3. The requested data_phase is TASKFILE_NO_DATA. + ============ =============================================== HOB_DATA If in_flags.b.data is set. It will contain DD8-DD15 on little endian machines and DD0-DD7 on big endian machines. @@ -689,10 +854,12 @@ HDIO_DRIVE_TASKFILE execute raw taskfile SECTOR LCYL HCYL + ============ =============================================== The data_phase field describes the data transfer to be performed. Value is one of: + =================== ======================================== TASKFILE_IN TASKFILE_MULTI_IN TASKFILE_OUT @@ -708,15 +875,18 @@ HDIO_DRIVE_TASKFILE execute raw taskfile TASKFILE_P_OUT unimplemented TASKFILE_P_OUT_DMA unimplemented TASKFILE_P_OUT_DMAQ unimplemented + =================== ======================================== The req_cmd field classifies the command type. It may be one of: + ======================== ======================================= IDE_DRIVE_TASK_NO_DATA IDE_DRIVE_TASK_SET_XFER unimplemented IDE_DRIVE_TASK_IN IDE_DRIVE_TASK_OUT unimplemented IDE_DRIVE_TASK_RAW_WRITE + ======================== ======================================= [6] Do not access {in|out}_flags->all except for resetting all the bits. Always access individual bit fields. ->all @@ -726,45 +896,57 @@ HDIO_DRIVE_TASKFILE execute raw taskfile -HDIO_DRIVE_CMD execute a special drive command +HDIO_DRIVE_CMD + execute a special drive command + Note: If you don't have a copy of the ANSI ATA specification handy, you should probably ignore this ioctl. - usage: + usage:: u8 args[4+XFER_SIZE]; + ... ioctl(fd, HDIO_DRIVE_CMD, args); inputs: + Commands other than WIN_SMART: - Commands other than WIN_SMART + ======= ======= args[0] COMMAND args[1] NSECTOR args[2] FEATURE args[3] NSECTOR + ======= ======= + + WIN_SMART: - WIN_SMART + ======= ======= args[0] COMMAND args[1] SECTOR args[2] FEATURE args[3] NSECTOR + ======= ======= outputs: + args[] buffer is filled with register values followed by any + - args[] buffer is filled with register values followed by any data returned by the disk. + + ======== ==================================================== args[0] status args[1] error args[2] NSECTOR args[3] undefined args[4+] NSECTOR * 512 bytes of data returned by the command. + ======== ==================================================== error returns: - EACCES Access denied: requires CAP_SYS_RAWIO - ENOMEM Unable to allocate memory for task - EIO Drive reports error + - EACCES Access denied: requires CAP_SYS_RAWIO + - ENOMEM Unable to allocate memory for task + - EIO Drive reports error notes: @@ -789,20 +971,24 @@ HDIO_DRIVE_CMD execute a special drive command -HDIO_DRIVE_TASK execute task and special drive command +HDIO_DRIVE_TASK + execute task and special drive command + Note: If you don't have a copy of the ANSI ATA specification handy, you should probably ignore this ioctl. - usage: + usage:: u8 args[7]; + ... ioctl(fd, HDIO_DRIVE_TASK, args); inputs: + Taskfile register values: - Taskfile register values: + ======= ======= args[0] COMMAND args[1] FEATURE args[2] NSECTOR @@ -810,10 +996,13 @@ HDIO_DRIVE_TASK execute task and special drive command args[4] LCYL args[5] HCYL args[6] SELECT + ======= ======= outputs: + Taskfile register values: + - Taskfile register values: + ======= ======= args[0] status args[1] error args[2] NSECTOR @@ -821,12 +1010,13 @@ HDIO_DRIVE_TASK execute task and special drive command args[4] LCYL args[5] HCYL args[6] SELECT + ======= ======= error returns: - EACCES Access denied: requires CAP_SYS_RAWIO - ENOMEM Unable to allocate memory for task - ENOMSG Device is not a disk drive. - EIO Drive failed the command. + - EACCES Access denied: requires CAP_SYS_RAWIO + - ENOMEM Unable to allocate memory for task + - ENOMSG Device is not a disk drive. + - EIO Drive failed the command. notes: @@ -836,236 +1026,317 @@ HDIO_DRIVE_TASK execute task and special drive command -HDIO_DRIVE_CMD_AEB HDIO_DRIVE_TASK +HDIO_DRIVE_CMD_AEB + HDIO_DRIVE_TASK + Not implemented, as of 2.6.8.1 -HDIO_SET_32BIT change io_32bit flags +HDIO_SET_32BIT + change io_32bit flags + - usage: + usage:: int val; + ioctl(fd, HDIO_SET_32BIT, val); inputs: - New value for io_32bit flag + New value for io_32bit flag + + + + outputs: + none + - outputs: none error return: - EINVAL (bdev != bdev->bd_contains) (not sure what this means) - EACCES Access denied: requires CAP_SYS_ADMIN - EINVAL value out of range [0 3] - EBUSY Controller busy + - EINVAL (bdev != bdev->bd_contains) (not sure what this means) + - EACCES Access denied: requires CAP_SYS_ADMIN + - EINVAL value out of range [0 3] + - EBUSY Controller busy -HDIO_SET_NOWERR change ignore-write-error flag +HDIO_SET_NOWERR + change ignore-write-error flag - usage: + + usage:: int val; + ioctl(fd, HDIO_SET_NOWERR, val); inputs: - New value for ignore-write-error flag. Used for ignoring + New value for ignore-write-error flag. Used for ignoring + + WRERR_STAT - outputs: none + outputs: + none + + error return: - EINVAL (bdev != bdev->bd_contains) (not sure what this means) - EACCES Access denied: requires CAP_SYS_ADMIN - EINVAL value out of range [0 1] - EBUSY Controller busy + - EINVAL (bdev != bdev->bd_contains) (not sure what this means) + - EACCES Access denied: requires CAP_SYS_ADMIN + - EINVAL value out of range [0 1] + - EBUSY Controller busy + +HDIO_SET_DMA + change use-dma flag -HDIO_SET_DMA change use-dma flag - usage: + usage:: long val; + ioctl(fd, HDIO_SET_DMA, val); inputs: - New value for use-dma flag + New value for use-dma flag + + + + outputs: + none + - outputs: none error return: - EINVAL (bdev != bdev->bd_contains) (not sure what this means) - EACCES Access denied: requires CAP_SYS_ADMIN - EINVAL value out of range [0 1] - EBUSY Controller busy + - EINVAL (bdev != bdev->bd_contains) (not sure what this means) + - EACCES Access denied: requires CAP_SYS_ADMIN + - EINVAL value out of range [0 1] + - EBUSY Controller busy + +HDIO_SET_PIO_MODE + reconfig interface to new speed -HDIO_SET_PIO_MODE reconfig interface to new speed - usage: + usage:: long val; + ioctl(fd, HDIO_SET_PIO_MODE, val); inputs: - New interface speed. + New interface speed. + + + + outputs: + none + - outputs: none error return: - EINVAL (bdev != bdev->bd_contains) (not sure what this means) - EACCES Access denied: requires CAP_SYS_ADMIN - EINVAL value out of range [0 255] - EBUSY Controller busy + - EINVAL (bdev != bdev->bd_contains) (not sure what this means) + - EACCES Access denied: requires CAP_SYS_ADMIN + - EINVAL value out of range [0 255] + - EBUSY Controller busy + +HDIO_SCAN_HWIF + register and (re)scan interface -HDIO_SCAN_HWIF register and (re)scan interface - usage: + usage:: int args[3] + ... ioctl(fd, HDIO_SCAN_HWIF, args); inputs: + + ======= ========================= args[0] io address to probe + + args[1] control address to probe args[2] irq number + ======= ========================= + + outputs: + none + - outputs: none error returns: - EACCES Access denied: requires CAP_SYS_RAWIO - EIO Probe failed. + - EACCES Access denied: requires CAP_SYS_RAWIO + - EIO Probe failed. notes: + This ioctl initializes the addresses and irq for a disk + controller, probes for drives, and creates /proc/ide + interfaces as appropriate. - This ioctl initializes the addresses and irq for a disk - controller, probes for drives, and creates /proc/ide - interfaces as appropriate. +HDIO_UNREGISTER_HWIF + unregister interface -HDIO_UNREGISTER_HWIF unregister interface - usage: + usage:: int index; + ioctl(fd, HDIO_UNREGISTER_HWIF, index); inputs: - index index of hardware interface to unregister + index index of hardware interface to unregister + + + + outputs: + none + - outputs: none error returns: - EACCES Access denied: requires CAP_SYS_RAWIO + - EACCES Access denied: requires CAP_SYS_RAWIO notes: + This ioctl removes a hardware interface from the kernel. - This ioctl removes a hardware interface from the kernel. + Currently (2.6.8) this ioctl silently fails if any drive on + the interface is busy. - Currently (2.6.8) this ioctl silently fails if any drive on - the interface is busy. +HDIO_SET_WCACHE + change write cache enable-disable -HDIO_SET_WCACHE change write cache enable-disable - usage: + usage:: int val; + ioctl(fd, HDIO_SET_WCACHE, val); inputs: - New value for write cache enable + New value for write cache enable + + + + outputs: + none + - outputs: none error return: - EINVAL (bdev != bdev->bd_contains) (not sure what this means) - EACCES Access denied: requires CAP_SYS_ADMIN - EINVAL value out of range [0 1] - EBUSY Controller busy + - EINVAL (bdev != bdev->bd_contains) (not sure what this means) + - EACCES Access denied: requires CAP_SYS_ADMIN + - EINVAL value out of range [0 1] + - EBUSY Controller busy + +HDIO_SET_ACOUSTIC + change acoustic behavior -HDIO_SET_ACOUSTIC change acoustic behavior - usage: + usage:: int val; + ioctl(fd, HDIO_SET_ACOUSTIC, val); inputs: - New value for drive acoustic settings + New value for drive acoustic settings + + + + outputs: + none + - outputs: none error return: - EINVAL (bdev != bdev->bd_contains) (not sure what this means) - EACCES Access denied: requires CAP_SYS_ADMIN - EINVAL value out of range [0 254] - EBUSY Controller busy + - EINVAL (bdev != bdev->bd_contains) (not sure what this means) + - EACCES Access denied: requires CAP_SYS_ADMIN + - EINVAL value out of range [0 254] + - EBUSY Controller busy -HDIO_SET_QDMA change use-qdma flag +HDIO_SET_QDMA + change use-qdma flag + Not implemented, as of 2.6.8.1 -HDIO_SET_ADDRESS change lba addressing modes +HDIO_SET_ADDRESS + change lba addressing modes + - usage: + usage:: int val; + ioctl(fd, HDIO_SET_ADDRESS, val); inputs: - New value for addressing mode - 0 = 28-bit - 1 = 48-bit - 2 = 48-bit doing 28-bit + New value for addressing mode + + = =================== + 0 28-bit + 1 48-bit + 2 48-bit doing 28-bit + = =================== + + outputs: + none + - outputs: none error return: - EINVAL (bdev != bdev->bd_contains) (not sure what this means) - EACCES Access denied: requires CAP_SYS_ADMIN - EINVAL value out of range [0 2] - EBUSY Controller busy - EIO Drive does not support lba48 mode. + - EINVAL (bdev != bdev->bd_contains) (not sure what this means) + - EACCES Access denied: requires CAP_SYS_ADMIN + - EINVAL value out of range [0 2] + - EBUSY Controller busy + - EIO Drive does not support lba48 mode. HDIO_SET_IDE_SCSI + usage:: - usage: long val; + ioctl(fd, HDIO_SET_IDE_SCSI, val); inputs: - New value for scsi emulation mode (?) + New value for scsi emulation mode (?) - outputs: none - error return: - EINVAL (bdev != bdev->bd_contains) (not sure what this means) - EACCES Access denied: requires CAP_SYS_ADMIN - EINVAL value out of range [0 1] - EBUSY Controller busy + outputs: + none -HDIO_SET_SCSI_IDE - Not implemented, as of 2.6.8.1 + error return: + - EINVAL (bdev != bdev->bd_contains) (not sure what this means) + - EACCES Access denied: requires CAP_SYS_ADMIN + - EINVAL value out of range [0 1] + - EBUSY Controller busy + +HDIO_SET_SCSI_IDE + Not implemented, as of 2.6.8.1 diff --git a/Documentation/ioctl/index.rst b/Documentation/ioctl/index.rst new file mode 100644 index 000000000000..1a6f437566e3 --- /dev/null +++ b/Documentation/ioctl/index.rst @@ -0,0 +1,16 @@ +:orphan: + +====== +IOCTLs +====== + +.. toctree:: + :maxdepth: 1 + + ioctl-number + + botching-up-ioctls + ioctl-decoding + + cdrom + hdio diff --git a/Documentation/ioctl/ioctl-decoding.txt b/Documentation/ioctl/ioctl-decoding.rst index e35efb0cec2e..380d6bb3e3ea 100644 --- a/Documentation/ioctl/ioctl-decoding.txt +++ b/Documentation/ioctl/ioctl-decoding.rst @@ -1,10 +1,16 @@ +============================== +Decoding an IOCTL Magic Number +============================== + To decode a hex IOCTL code: Most architectures use this generic format, but check include/ARCH/ioctl.h for specifics, e.g. powerpc uses 3 bits to encode read/write and 13 bits for size. - bits meaning + ====== ================================== + bits meaning + ====== ================================== 31-30 00 - no parameters: uses _IO macro 10 - read: _IOR 01 - write: _IOW @@ -16,9 +22,10 @@ uses 3 bits to encode read/write and 13 bits for size. unique to each driver 7-0 function # + ====== ================================== So for example 0x82187201 is a read with arg length of 0x218, -character 'r' function 1. Grepping the source reveals this is: +character 'r' function 1. Grepping the source reveals this is:: -#define VFAT_IOCTL_READDIR_BOTH _IOR('r', 1, struct dirent [2]) + #define VFAT_IOCTL_READDIR_BOTH _IOR('r', 1, struct dirent [2]) diff --git a/drivers/gpu/drm/drm_ioctl.c b/drivers/gpu/drm/drm_ioctl.c index 2263e3ddd822..42fb0d6d6034 100644 --- a/drivers/gpu/drm/drm_ioctl.c +++ b/drivers/gpu/drm/drm_ioctl.c @@ -730,7 +730,7 @@ static const struct drm_ioctl_desc drm_ioctls[] = { * }; * * Please make sure that you follow all the best practices from - * ``Documentation/ioctl/botching-up-ioctls.txt``. Note that drm_ioctl() + * ``Documentation/ioctl/botching-up-ioctls.rst``. Note that drm_ioctl() * automatically zero-extends structures, hence make sure you can add more stuff * at the end, i.e. don't put a variable sized array there. * |