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- Summary of HDIO_ ioctl calls.
- ============================
-
- Edward A. Falk <efalk@google.com>
-
- 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)
-in drivers/ide/ide.c and drivers/block/scsi_ioctl.c
-
-ioctl values are listed in <linux/hdreg.h>. As of this writing, they
-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
- HDIO_GET_QDMA get use-qdma flag
- HDIO_SET_XFER set transfer rate via proc
- HDIO_OBSOLETE_IDENTITY OBSOLETE, DO NOT USE
- HDIO_GET_KEEPSETTINGS get keep-settings-on-reset flag
- HDIO_GET_32BIT get current io_32bit setting
- HDIO_GET_NOWERR get ignore-write-error flag
- HDIO_GET_DMA get use-dma flag
- HDIO_GET_NICE get nice flags
- HDIO_GET_IDENTITY get IDE identification info
- HDIO_GET_WCACHE get write cache mode on|off
- HDIO_GET_ACOUSTIC get acoustic value
- HDIO_GET_ADDRESS get sector addressing mode
- HDIO_GET_BUSSTATE get the bus state of the hwif
- HDIO_TRISTATE_HWIF execute a channel tristate
- HDIO_DRIVE_RESET execute a device reset
- HDIO_DRIVE_TASKFILE execute raw taskfile
- 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
- HDIO_SET_32BIT change io_32bit flags
- HDIO_SET_NOWERR change ignore-write-error flag
- HDIO_SET_DMA change use-dma flag
- HDIO_SET_PIO_MODE reconfig interface to new speed
- HDIO_SCAN_HWIF register and (re)scan interface
- HDIO_SET_NICE set nice flags
- HDIO_UNREGISTER_HWIF unregister interface
- HDIO_SET_WCACHE change write cache enable-disable
- HDIO_SET_ACOUSTIC change acoustic behavior
- HDIO_SET_BUSSTATE set the bus state of the hwif
- HDIO_SET_QDMA change use-qdma flag
- HDIO_SET_ADDRESS change lba addressing modes
-
- 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:
-
- Unless otherwise specified, all ioctl calls return 0 on success
- and -1 with errno set to an appropriate value on error.
-
- 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.
-
- Unless otherwise specified, all data structures and constants
- are defined in <linux/hdreg.h>
-
-
-
-HDIO_GETGEO get device geometry
-
- usage:
-
- struct hd_geometry geom;
- ioctl(fd, HDIO_GETGEO, &geom);
-
-
- inputs: none
-
- outputs:
-
- 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
-
-
- 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.
-
- 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.
-
-
-
-
-HDIO_GET_UNMASKINTR get current unmask setting
-
- usage:
-
- long val;
- ioctl(fd, HDIO_GET_UNMASKINTR, &val);
-
- inputs: none
-
- outputs:
- The value of the drive's current unmask setting
-
-
-
-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
-
- 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
-
-
-
-
-HDIO_GET_MULTCOUNT get current IDE blockmode setting
-
- usage:
-
- long val;
- ioctl(fd, HDIO_GET_MULTCOUNT, &val);
-
- inputs: none
-
- outputs:
- 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
-
- 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.
-
- 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.
-
- notes:
-
- 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
-
-
-
-HDIO_GET_QDMA get use-qdma flag
-
- Not implemented, as of 2.6.8.1
-
-
-
-HDIO_SET_XFER set transfer rate via proc
-
- Not implemented, as of 2.6.8.1
-
-
-
-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
-
- usage:
-
- unsigned char identity[512];
- ioctl(fd, HDIO_GET_IDENTITY, identity);
-
- inputs: none
-
- 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
-
- 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.
-
- This information is also available from /proc/ide/hdX/identify
-
-
-
-HDIO_GET_KEEPSETTINGS get keep-settings-on-reset flag
-
- usage:
-
- long val;
- ioctl(fd, HDIO_GET_KEEPSETTINGS, &val);
-
- inputs: none
-
- outputs:
- The value of the current "keep settings" flag
-
- notes:
-
- When set, indicates that kernel should restore settings
- after a drive reset.
-
-
-
-HDIO_SET_KEEPSETTINGS keep ioctl settings on reset
-
- usage:
-
- long val;
- ioctl(fd, HDIO_SET_KEEPSETTINGS, val);
-
- inputs:
- New value for keep_settings flag
-
- 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
-
-
-
-HDIO_GET_32BIT get current io_32bit setting
-
- usage:
-
- long val;
- ioctl(fd, HDIO_GET_32BIT, &val);
-
- inputs: none
-
- outputs:
- The value of the current io_32bit setting
-
- notes:
-
- 0=16-bit, 1=32-bit, 2,3 = 32bit+sync
-
-
-
-HDIO_GET_NOWERR get ignore-write-error flag
-
- usage:
-
- long val;
- ioctl(fd, HDIO_GET_NOWERR, &val);
-
- inputs: none
-
- outputs:
- The value of the current ignore-write-error flag
-
-
-
-HDIO_GET_DMA get use-dma flag
-
- usage:
-
- long val;
- ioctl(fd, HDIO_GET_DMA, &val);
-
- inputs: none
-
- outputs:
- The value of the current use-dma flag
-
-
-
-HDIO_GET_NICE get nice flags
-
- usage:
-
- long nice;
- ioctl(fd, HDIO_GET_NICE, &nice);
-
- inputs: none
-
- outputs:
-
- 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.
- See <linux/hdreg.h>, near symbol IDE_NICE_DSC_OVERLAP.
-
-
-
-
-HDIO_SET_NICE set nice flags
-
- usage:
-
- unsigned long nice;
- ...
- ioctl(fd, HDIO_SET_NICE, nice);
-
- inputs:
- bitmask of nice flags.
-
- 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
-
- notes:
-
- 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.
-
-
-
-
-
-HDIO_GET_WCACHE get write cache mode on|off
-
- usage:
-
- long val;
- ioctl(fd, HDIO_GET_WCACHE, &val);
-
- inputs: none
-
- outputs:
- The value of the current write cache mode
-
-
-
-HDIO_GET_ACOUSTIC get acoustic value
-
- usage:
-
- long val;
- ioctl(fd, HDIO_GET_ACOUSTIC, &val);
-
- inputs: none
-
- outputs:
- The value of the current acoustic settings
-
- notes:
-
- See HDIO_SET_ACOUSTIC
-
-
-
-HDIO_GET_ADDRESS
-
- usage:
-
- long val;
- ioctl(fd, HDIO_GET_ADDRESS, &val);
-
- 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
-
-
-
-HDIO_GET_BUSSTATE get the bus state of the hwif
-
- usage:
-
- long state;
- ioctl(fd, HDIO_SCAN_HWIF, &state);
-
- inputs: none
-
- outputs:
- 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
-
-
-
-
-HDIO_SET_BUSSTATE set the bus state of the hwif
-
- usage:
-
- int state;
- ...
- ioctl(fd, HDIO_SCAN_HWIF, state);
-
- inputs:
- Desired IDE power state. One of BUSSTATE_OFF, BUSSTATE_ON,
- or BUSSTATE_TRISTATE
-
- outputs: none
-
- error returns:
- EACCES Access denied: requires CAP_SYS_RAWIO
- EOPNOTSUPP Hardware interface does not support bus power control
-
-
-
-
-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
-
- usage:
-
- int args[3]
- ...
- ioctl(fd, HDIO_DRIVE_RESET, args);
-
- inputs: 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
-
- notes:
-
- 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.
-
-
-
-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.
-
- usage:
-
- struct {
- ide_task_request_t req_task;
- u8 outbuf[OUTPUT_SIZE];
- u8 inbuf[INPUT_SIZE];
- } task;
- memset(&task.req_task, 0, sizeof(task.req_task));
- task.req_task.out_size = sizeof(task.outbuf);
- task.req_task.in_size = sizeof(task.inbuf);
- ...
- ioctl(fd, HDIO_DRIVE_TASKFILE, &task);
- ...
-
- inputs:
-
- (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
- in_flags flags indicating which registers should be returned
- data_phase see below
- req_cmd command type to be executed
- 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.
-
- notes:
-
- [1] READ THE FOLLOWING NOTES *CAREFULLY*. THIS IOCTL IS
- FULL OF GOTCHAS. Extreme caution should be used with using
- this ioctl. A mistake can easily corrupt data or hang the
- system.
-
- [2] Both the input and output buffers are copied from the
- user and written back to the user, even when not used.
-
- [3] If one or more bits are set in out_flags and in_flags is
- zero, the following values are used for in_flags.all and
- written back into in_flags on completion.
-
- * IDE_TASKFILE_STD_IN_FLAGS | (IDE_HOB_STD_IN_FLAGS << 8)
- if LBA48 addressing is enabled for the drive
- * IDE_TASKFILE_STD_IN_FLAGS
- if CHS/LBA28
-
- The association between in_flags.all and each enable
- bitfield flips depending on endianness; fortunately, TASKFILE
- only uses inflags.b.data bit and ignores all other bits.
- The end result is that, on any endian machines, it has no
- effect other than modifying in_flags on completion.
-
- [4] The default value of SELECT is (0xa0|DEV_bit|LBA_bit)
- except for four drives per port chipsets. For four drives
- per port chipsets, it's (0xa0|DEV_bit|LBA_bit) for the first
- pair and (0x80|DEV_bit|LBA_bit) for the second pair.
-
- [5] The argument to the ioctl is a pointer to a region of
- memory containing a ide_task_request_t structure, followed
- by an optional buffer of data to be transmitted to the
- drive, followed by an optional buffer to receive data from
- the drive.
-
- 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
- contain valid values. Type ide_reg_valid_t.
- in_flags flags indicating which entries in the
- 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
- HOB_LCYL If the drive supports LBA48
- HOB_HCYL If the drive supports LBA48
- FEATURE
- NSECTOR
- SECTOR
- LCYL
- HCYL
- 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.
- DATA If out_flags.b.data is set. DATA will
- travel on DD0-DD7 on little endian machines
- and on DD8-DD15 on big endian machines.
- HOB_NSECTOR If out_flags.b.nsector_hob is set
- HOB_SECTOR If out_flags.b.sector_hob is set
- HOB_LCYL If out_flags.b.lcyl_hob is set
- HOB_HCYL If out_flags.b.hcyl_hob is set
- FEATURE If out_flags.b.feature is set
- NSECTOR If out_flags.b.nsector is set
- SECTOR If out_flags.b.sector is set
- LCYL If out_flags.b.lcyl is set
- 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
- following conditions is met; otherwise, the original values
- will be written back, unchanged.
-
- 1. The drive fails the command (EIO).
- 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.
- DATA If in_flags.b.data is set. It will contain
- DD0-DD7 on little endian machines and
- DD8-DD15 on big endian machines.
- HOB_FEATURE If the drive supports LBA48
- HOB_NSECTOR If the drive supports LBA48
- HOB_SECTOR If the drive supports LBA48
- HOB_LCYL If the drive supports LBA48
- HOB_HCYL If the drive supports LBA48
- NSECTOR
- 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
- TASKFILE_MULTI_OUT
- TASKFILE_IN_OUT
- TASKFILE_IN_DMA
- TASKFILE_IN_DMAQ == IN_DMA (queueing not supported)
- TASKFILE_OUT_DMA
- TASKFILE_OUT_DMAQ == OUT_DMA (queueing not supported)
- TASKFILE_P_IN unimplemented
- TASKFILE_P_IN_DMA unimplemented
- TASKFILE_P_IN_DMAQ unimplemented
- 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
- value will flip depending on endianness. For the same
- reason, do not use IDE_{TASKFILE|HOB}_STD_{OUT|IN}_FLAGS
- constants defined in hdreg.h.
-
-
-
-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:
-
- u8 args[4+XFER_SIZE];
- ...
- ioctl(fd, HDIO_DRIVE_CMD, args);
-
- inputs:
-
- Commands other than WIN_SMART
- args[0] COMMAND
- args[1] NSECTOR
- args[2] FEATURE
- args[3] NSECTOR
-
- 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
- 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
-
- notes:
-
- [1] For commands other than WIN_SMART, args[1] should equal
- args[3]. SECTOR, LCYL and HCYL are undefined. For
- WIN_SMART, 0x4f and 0xc2 are loaded into LCYL and HCYL
- respectively. In both cases SELECT will contain the default
- value for the drive. Please refer to HDIO_DRIVE_TASKFILE
- notes for the default value of SELECT.
-
- [2] If NSECTOR value is greater than zero and the drive sets
- DRQ when interrupting for the command, NSECTOR * 512 bytes
- are read from the device into the area following NSECTOR.
- In the above example, the area would be
- args[4..4+XFER_SIZE]. 16bit PIO is used regardless of
- HDIO_SET_32BIT setting.
-
- [3] If COMMAND == WIN_SETFEATURES && FEATURE == SETFEATURES_XFER
- && NSECTOR >= XFER_SW_DMA_0 && the drive supports any DMA
- mode, IDE driver will try to tune the transfer mode of the
- drive accordingly.
-
-
-
-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:
-
- u8 args[7];
- ...
- ioctl(fd, HDIO_DRIVE_TASK, args);
-
- inputs:
-
- Taskfile register values:
- args[0] COMMAND
- args[1] FEATURE
- args[2] NSECTOR
- args[3] SECTOR
- args[4] LCYL
- args[5] HCYL
- args[6] SELECT
-
- outputs:
-
- Taskfile register values:
- args[0] status
- args[1] error
- args[2] NSECTOR
- args[3] SECTOR
- 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.
-
- notes:
-
- [1] DEV bit (0x10) of SELECT register is ignored and the
- appropriate value for the drive is used. All other bits
- are used unaltered.
-
-
-
-HDIO_DRIVE_CMD_AEB HDIO_DRIVE_TASK
-
- Not implemented, as of 2.6.8.1
-
-
-
-HDIO_SET_32BIT change io_32bit flags
-
- usage:
-
- int val;
- ioctl(fd, HDIO_SET_32BIT, val);
-
- inputs:
- New value for io_32bit flag
-
- 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
-
-
-
-
-HDIO_SET_NOWERR change ignore-write-error flag
-
- usage:
-
- int val;
- ioctl(fd, HDIO_SET_NOWERR, val);
-
- inputs:
- New value for ignore-write-error flag. Used for ignoring
- WRERR_STAT
-
- 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
-
-
-
-HDIO_SET_DMA change use-dma flag
-
- usage:
-
- long val;
- ioctl(fd, HDIO_SET_DMA, val);
-
- inputs:
- New value for use-dma flag
-
- 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
-
-
-
-HDIO_SET_PIO_MODE reconfig interface to new speed
-
- usage:
-
- long val;
- ioctl(fd, HDIO_SET_PIO_MODE, val);
-
- inputs:
- New interface speed.
-
- 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
-
-
-
-HDIO_SCAN_HWIF register and (re)scan interface
-
- 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
-
- error returns:
- 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.
-
-
-
-HDIO_UNREGISTER_HWIF unregister interface
-
- usage:
-
- int index;
- ioctl(fd, HDIO_UNREGISTER_HWIF, index);
-
- inputs:
- index index of hardware interface to unregister
-
- outputs: none
-
- error returns:
- EACCES Access denied: requires CAP_SYS_RAWIO
-
- notes:
-
- 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.
-
-
-
-HDIO_SET_WCACHE change write cache enable-disable
-
- usage:
-
- int val;
- ioctl(fd, HDIO_SET_WCACHE, val);
-
- inputs:
- New value for write cache enable
-
- 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
-
-
-
-HDIO_SET_ACOUSTIC change acoustic behavior
-
- usage:
-
- int val;
- ioctl(fd, HDIO_SET_ACOUSTIC, val);
-
- inputs:
- New value for drive acoustic settings
-
- 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
-
-
-
-HDIO_SET_QDMA change use-qdma flag
-
- Not implemented, as of 2.6.8.1
-
-
-
-HDIO_SET_ADDRESS change lba addressing modes
-
- 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
-
- 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.
-
-
-HDIO_SET_IDE_SCSI
-
- usage:
-
- long val;
- ioctl(fd, HDIO_SET_IDE_SCSI, val);
-
- inputs:
- 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
-
-
-
-HDIO_SET_SCSI_IDE
-
- Not implemented, as of 2.6.8.1
-
-