1072 lines
24 KiB
Plaintext
1072 lines
24 KiB
Plaintext
Summary of HDIO_ ioctl calls.
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============================
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Edward A. Falk <efalk@google.com>
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November, 2004
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This document attempts to describe the ioctl(2) calls supported by
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the HD/IDE layer. These are by-and-large implemented (as of Linux 2.6)
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in drivers/ide/ide.c and drivers/block/scsi_ioctl.c
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ioctl values are listed in <linux/hdreg.h>. As of this writing, they
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are as follows:
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ioctls that pass argument pointers to user space:
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HDIO_GETGEO get device geometry
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HDIO_GET_UNMASKINTR get current unmask setting
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HDIO_GET_MULTCOUNT get current IDE blockmode setting
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HDIO_GET_QDMA get use-qdma flag
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HDIO_SET_XFER set transfer rate via proc
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HDIO_OBSOLETE_IDENTITY OBSOLETE, DO NOT USE
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HDIO_GET_KEEPSETTINGS get keep-settings-on-reset flag
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HDIO_GET_32BIT get current io_32bit setting
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HDIO_GET_NOWERR get ignore-write-error flag
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HDIO_GET_DMA get use-dma flag
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HDIO_GET_NICE get nice flags
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HDIO_GET_IDENTITY get IDE identification info
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HDIO_GET_WCACHE get write cache mode on|off
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HDIO_GET_ACOUSTIC get acoustic value
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HDIO_GET_ADDRESS get sector addressing mode
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HDIO_GET_BUSSTATE get the bus state of the hwif
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HDIO_TRISTATE_HWIF execute a channel tristate
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HDIO_DRIVE_RESET execute a device reset
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HDIO_DRIVE_TASKFILE execute raw taskfile
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HDIO_DRIVE_TASK execute task and special drive command
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HDIO_DRIVE_CMD execute a special drive command
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HDIO_DRIVE_CMD_AEB HDIO_DRIVE_TASK
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ioctls that pass non-pointer values:
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HDIO_SET_MULTCOUNT change IDE blockmode
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HDIO_SET_UNMASKINTR permit other irqs during I/O
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HDIO_SET_KEEPSETTINGS keep ioctl settings on reset
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HDIO_SET_32BIT change io_32bit flags
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HDIO_SET_NOWERR change ignore-write-error flag
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HDIO_SET_DMA change use-dma flag
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HDIO_SET_PIO_MODE reconfig interface to new speed
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HDIO_SCAN_HWIF register and (re)scan interface
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HDIO_SET_NICE set nice flags
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HDIO_UNREGISTER_HWIF unregister interface
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HDIO_SET_WCACHE change write cache enable-disable
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HDIO_SET_ACOUSTIC change acoustic behavior
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HDIO_SET_BUSSTATE set the bus state of the hwif
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HDIO_SET_QDMA change use-qdma flag
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HDIO_SET_ADDRESS change lba addressing modes
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HDIO_SET_IDE_SCSI Set scsi emulation mode on/off
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HDIO_SET_SCSI_IDE not implemented yet
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The information that follows was determined from reading kernel source
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code. It is likely that some corrections will be made over time.
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General:
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Unless otherwise specified, all ioctl calls return 0 on success
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and -1 with errno set to an appropriate value on error.
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Unless otherwise specified, all ioctl calls return -1 and set
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errno to EFAULT on a failed attempt to copy data to or from user
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address space.
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Unless otherwise specified, all data structures and constants
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are defined in <linux/hdreg.h>
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HDIO_GETGEO get device geometry
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usage:
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struct hd_geometry geom;
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ioctl(fd, HDIO_GETGEO, &geom);
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inputs: none
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outputs:
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hd_geometry structure containing:
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heads number of heads
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sectors number of sectors/track
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cylinders number of cylinders, mod 65536
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start starting sector of this partition.
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error returns:
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EINVAL if the device is not a disk drive or floppy drive,
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or if the user passes a null pointer
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notes:
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Not particularly useful with modern disk drives, whose geometry
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is a polite fiction anyway. Modern drives are addressed
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purely by sector number nowadays (lba addressing), and the
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drive geometry is an abstraction which is actually subject
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to change. Currently (as of Nov 2004), the geometry values
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are the "bios" values -- presumably the values the drive had
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when Linux first booted.
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In addition, the cylinders field of the hd_geometry is an
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unsigned short, meaning that on most architectures, this
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ioctl will not return a meaningful value on drives with more
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than 65535 tracks.
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The start field is unsigned long, meaning that it will not
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contain a meaningful value for disks over 219 Gb in size.
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HDIO_GET_UNMASKINTR get current unmask setting
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usage:
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long val;
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ioctl(fd, HDIO_GET_UNMASKINTR, &val);
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inputs: none
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outputs:
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The value of the drive's current unmask setting
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HDIO_SET_UNMASKINTR permit other irqs during I/O
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usage:
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unsigned long val;
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ioctl(fd, HDIO_SET_UNMASKINTR, val);
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inputs:
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New value for unmask flag
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outputs: none
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error return:
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EINVAL (bdev != bdev->bd_contains) (not sure what this means)
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EACCES Access denied: requires CAP_SYS_ADMIN
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EINVAL value out of range [0 1]
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EBUSY Controller busy
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HDIO_GET_MULTCOUNT get current IDE blockmode setting
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usage:
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long val;
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ioctl(fd, HDIO_GET_MULTCOUNT, &val);
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inputs: none
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outputs:
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The value of the current IDE block mode setting. This
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controls how many sectors the drive will transfer per
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interrupt.
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HDIO_SET_MULTCOUNT change IDE blockmode
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usage:
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int val;
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ioctl(fd, HDIO_SET_MULTCOUNT, val);
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inputs:
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New value for IDE block mode setting. This controls how many
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sectors the drive will transfer per interrupt.
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outputs: none
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error return:
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EINVAL (bdev != bdev->bd_contains) (not sure what this means)
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EACCES Access denied: requires CAP_SYS_ADMIN
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EINVAL value out of range supported by disk.
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EBUSY Controller busy or blockmode already set.
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EIO Drive did not accept new block mode.
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notes:
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Source code comments read:
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This is tightly woven into the driver->do_special cannot
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touch. DON'T do it again until a total personality rewrite
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is committed.
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If blockmode has already been set, this ioctl will fail with
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EBUSY
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HDIO_GET_QDMA get use-qdma flag
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Not implemented, as of 2.6.8.1
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HDIO_SET_XFER set transfer rate via proc
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Not implemented, as of 2.6.8.1
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HDIO_OBSOLETE_IDENTITY OBSOLETE, DO NOT USE
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Same as HDIO_GET_IDENTITY (see below), except that it only
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returns the first 142 bytes of drive identity information.
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HDIO_GET_IDENTITY get IDE identification info
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usage:
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unsigned char identity[512];
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ioctl(fd, HDIO_GET_IDENTITY, identity);
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inputs: none
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outputs:
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ATA drive identity information. For full description, see
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the IDENTIFY DEVICE and IDENTIFY PACKET DEVICE commands in
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the ATA specification.
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error returns:
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EINVAL (bdev != bdev->bd_contains) (not sure what this means)
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ENOMSG IDENTIFY DEVICE information not available
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notes:
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Returns information that was obtained when the drive was
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probed. Some of this information is subject to change, and
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this ioctl does not re-probe the drive to update the
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information.
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This information is also available from /proc/ide/hdX/identify
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HDIO_GET_KEEPSETTINGS get keep-settings-on-reset flag
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usage:
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long val;
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ioctl(fd, HDIO_GET_KEEPSETTINGS, &val);
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inputs: none
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outputs:
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The value of the current "keep settings" flag
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notes:
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When set, indicates that kernel should restore settings
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after a drive reset.
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HDIO_SET_KEEPSETTINGS keep ioctl settings on reset
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usage:
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long val;
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ioctl(fd, HDIO_SET_KEEPSETTINGS, val);
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inputs:
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New value for keep_settings flag
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outputs: none
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error return:
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EINVAL (bdev != bdev->bd_contains) (not sure what this means)
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EACCES Access denied: requires CAP_SYS_ADMIN
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EINVAL value out of range [0 1]
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EBUSY Controller busy
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HDIO_GET_32BIT get current io_32bit setting
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usage:
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long val;
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ioctl(fd, HDIO_GET_32BIT, &val);
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inputs: none
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outputs:
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The value of the current io_32bit setting
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notes:
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0=16-bit, 1=32-bit, 2,3 = 32bit+sync
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HDIO_GET_NOWERR get ignore-write-error flag
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usage:
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long val;
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ioctl(fd, HDIO_GET_NOWERR, &val);
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inputs: none
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outputs:
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The value of the current ignore-write-error flag
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HDIO_GET_DMA get use-dma flag
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usage:
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long val;
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ioctl(fd, HDIO_GET_DMA, &val);
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inputs: none
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outputs:
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The value of the current use-dma flag
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HDIO_GET_NICE get nice flags
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usage:
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long nice;
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ioctl(fd, HDIO_GET_NICE, &nice);
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inputs: none
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outputs:
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The drive's "nice" values.
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notes:
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Per-drive flags which determine when the system will give more
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bandwidth to other devices sharing the same IDE bus.
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See <linux/hdreg.h>, near symbol IDE_NICE_DSC_OVERLAP.
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HDIO_SET_NICE set nice flags
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usage:
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unsigned long nice;
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...
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ioctl(fd, HDIO_SET_NICE, nice);
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inputs:
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bitmask of nice flags.
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outputs: none
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error returns:
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EACCES Access denied: requires CAP_SYS_ADMIN
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EPERM Flags other than DSC_OVERLAP and NICE_1 set.
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EPERM DSC_OVERLAP specified but not supported by drive
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notes:
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This ioctl sets the DSC_OVERLAP and NICE_1 flags from values
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provided by the user.
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Nice flags are listed in <linux/hdreg.h>, starting with
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IDE_NICE_DSC_OVERLAP. These values represent shifts.
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HDIO_GET_WCACHE get write cache mode on|off
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usage:
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long val;
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ioctl(fd, HDIO_GET_WCACHE, &val);
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inputs: none
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outputs:
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The value of the current write cache mode
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HDIO_GET_ACOUSTIC get acoustic value
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usage:
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long val;
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ioctl(fd, HDIO_GET_ACOUSTIC, &val);
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inputs: none
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outputs:
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The value of the current acoustic settings
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notes:
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See HDIO_SET_ACOUSTIC
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HDIO_GET_ADDRESS
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usage:
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long val;
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ioctl(fd, HDIO_GET_ADDRESS, &val);
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inputs: none
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outputs:
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The value of the current addressing mode:
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0 = 28-bit
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1 = 48-bit
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2 = 48-bit doing 28-bit
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3 = 64-bit
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HDIO_GET_BUSSTATE get the bus state of the hwif
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usage:
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long state;
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ioctl(fd, HDIO_SCAN_HWIF, &state);
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inputs: none
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outputs:
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Current power state of the IDE bus. One of BUSSTATE_OFF,
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BUSSTATE_ON, or BUSSTATE_TRISTATE
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error returns:
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EACCES Access denied: requires CAP_SYS_ADMIN
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HDIO_SET_BUSSTATE set the bus state of the hwif
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usage:
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int state;
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...
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ioctl(fd, HDIO_SCAN_HWIF, state);
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inputs:
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Desired IDE power state. One of BUSSTATE_OFF, BUSSTATE_ON,
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or BUSSTATE_TRISTATE
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outputs: none
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error returns:
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EACCES Access denied: requires CAP_SYS_RAWIO
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EOPNOTSUPP Hardware interface does not support bus power control
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HDIO_TRISTATE_HWIF execute a channel tristate
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Not implemented, as of 2.6.8.1. See HDIO_SET_BUSSTATE
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HDIO_DRIVE_RESET execute a device reset
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usage:
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int args[3]
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...
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ioctl(fd, HDIO_DRIVE_RESET, args);
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inputs: none
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outputs: none
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error returns:
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EACCES Access denied: requires CAP_SYS_ADMIN
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ENXIO No such device: phy dead or ctl_addr == 0
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EIO I/O error: reset timed out or hardware error
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notes:
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Execute a reset on the device as soon as the current IO
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operation has completed.
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Executes an ATAPI soft reset if applicable, otherwise
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executes an ATA soft reset on the controller.
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HDIO_DRIVE_TASKFILE execute raw taskfile
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Note: If you don't have a copy of the ANSI ATA specification
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handy, you should probably ignore this ioctl.
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Execute an ATA disk command directly by writing the "taskfile"
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registers of the drive. Requires ADMIN and RAWIO access
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privileges.
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usage:
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struct {
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ide_task_request_t req_task;
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u8 outbuf[OUTPUT_SIZE];
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u8 inbuf[INPUT_SIZE];
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} task;
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memset(&task.req_task, 0, sizeof(task.req_task));
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task.req_task.out_size = sizeof(task.outbuf);
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task.req_task.in_size = sizeof(task.inbuf);
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...
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ioctl(fd, HDIO_DRIVE_TASKFILE, &task);
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...
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inputs:
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(See below for details on memory area passed to ioctl.)
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io_ports[8] values to be written to taskfile registers
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hob_ports[8] high-order bytes, for extended commands.
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out_flags flags indicating which registers are valid
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in_flags flags indicating which registers should be returned
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data_phase see below
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req_cmd command type to be executed
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out_size size of output buffer
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outbuf buffer of data to be transmitted to disk
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inbuf buffer of data to be received from disk (see [1])
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outputs:
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io_ports[] values returned in the taskfile registers
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hob_ports[] high-order bytes, for extended commands.
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out_flags flags indicating which registers are valid (see [2])
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in_flags flags indicating which registers should be returned
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outbuf buffer of data to be transmitted to disk (see [1])
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inbuf buffer of data to be received from disk
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error returns:
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EACCES CAP_SYS_ADMIN or CAP_SYS_RAWIO privilege not set.
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ENOMSG Device is not a disk drive.
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ENOMEM Unable to allocate memory for task
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EFAULT req_cmd == TASKFILE_IN_OUT (not implemented as of 2.6.8)
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EPERM req_cmd == TASKFILE_MULTI_OUT and drive
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multi-count not yet set.
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EIO Drive failed the command.
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notes:
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[1] READ THE FOLLOWING NOTES *CAREFULLY*. THIS IOCTL IS
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FULL OF GOTCHAS. Extreme caution should be used with using
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this ioctl. A mistake can easily corrupt data or hang the
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system.
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[2] Both the input and output buffers are copied from the
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user and written back to the user, even when not used.
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[3] If one or more bits are set in out_flags and in_flags is
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zero, the following values are used for in_flags.all and
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written back into in_flags on completion.
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* IDE_TASKFILE_STD_IN_FLAGS | (IDE_HOB_STD_IN_FLAGS << 8)
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if LBA48 addressing is enabled for the drive
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* IDE_TASKFILE_STD_IN_FLAGS
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if CHS/LBA28
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The association between in_flags.all and each enable
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bitfield flips depending on endianness; fortunately, TASKFILE
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only uses inflags.b.data bit and ignores all other bits.
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The end result is that, on any endian machines, it has no
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effect other than modifying in_flags on completion.
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[4] The default value of SELECT is (0xa0|DEV_bit|LBA_bit)
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except for four drives per port chipsets. For four drives
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per port chipsets, it's (0xa0|DEV_bit|LBA_bit) for the first
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pair and (0x80|DEV_bit|LBA_bit) for the second pair.
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[5] The argument to the ioctl is a pointer to a region of
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memory containing a ide_task_request_t structure, followed
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by an optional buffer of data to be transmitted to the
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drive, followed by an optional buffer to receive data from
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the drive.
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Command is passed to the disk drive via the ide_task_request_t
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structure, which contains these fields:
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io_ports[8] values for the taskfile registers
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hob_ports[8] high-order bytes, for extended commands
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out_flags flags indicating which entries in the
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io_ports[] and hob_ports[] arrays
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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
|
|
|
|
|