395 lines
13 KiB
Plaintext
395 lines
13 KiB
Plaintext
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Linux I2O User Space Interface
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rev 0.3 - 04/20/99
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=============================================================================
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Originally written by Deepak Saxena(deepak@plexity.net)
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Currently maintained by Deepak Saxena(deepak@plexity.net)
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=============================================================================
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I. Introduction
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The Linux I2O subsystem provides a set of ioctl() commands that can be
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utilized by user space applications to communicate with IOPs and devices
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on individual IOPs. This document defines the specific ioctl() commands
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that are available to the user and provides examples of their uses.
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This document assumes the reader is familiar with or has access to the
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I2O specification as no I2O message parameters are outlined. For information
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on the specification, see http://www.i2osig.org
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This document and the I2O user space interface are currently maintained
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by Deepak Saxena. Please send all comments, errata, and bug fixes to
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deepak@csociety.purdue.edu
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II. IOP Access
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Access to the I2O subsystem is provided through the device file named
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/dev/i2o/ctl. This file is a character file with major number 10 and minor
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number 166. It can be created through the following command:
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mknod /dev/i2o/ctl c 10 166
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III. Determining the IOP Count
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SYNOPSIS
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ioctl(fd, I2OGETIOPS, int *count);
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u8 count[MAX_I2O_CONTROLLERS];
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DESCRIPTION
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This function returns the system's active IOP table. count should
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point to a buffer containing MAX_I2O_CONTROLLERS entries. Upon
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returning, each entry will contain a non-zero value if the given
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IOP unit is active, and NULL if it is inactive or non-existent.
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RETURN VALUE.
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Returns 0 if no errors occur, and -1 otherwise. If an error occurs,
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errno is set appropriately:
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EFAULT Invalid user space pointer was passed
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IV. Getting Hardware Resource Table
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SYNOPSIS
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ioctl(fd, I2OHRTGET, struct i2o_cmd_hrt *hrt);
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struct i2o_cmd_hrtlct
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{
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u32 iop; /* IOP unit number */
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void *resbuf; /* Buffer for result */
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u32 *reslen; /* Buffer length in bytes */
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};
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DESCRIPTION
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This function returns the Hardware Resource Table of the IOP specified
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by hrt->iop in the buffer pointed to by hrt->resbuf. The actual size of
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the data is written into *(hrt->reslen).
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RETURNS
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This function returns 0 if no errors occur. If an error occurs, -1
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is returned and errno is set appropriately:
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EFAULT Invalid user space pointer was passed
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ENXIO Invalid IOP number
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ENOBUFS Buffer not large enough. If this occurs, the required
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buffer length is written into *(hrt->reslen)
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V. Getting Logical Configuration Table
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SYNOPSIS
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ioctl(fd, I2OLCTGET, struct i2o_cmd_lct *lct);
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struct i2o_cmd_hrtlct
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{
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u32 iop; /* IOP unit number */
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void *resbuf; /* Buffer for result */
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u32 *reslen; /* Buffer length in bytes */
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};
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DESCRIPTION
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This function returns the Logical Configuration Table of the IOP specified
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by lct->iop in the buffer pointed to by lct->resbuf. The actual size of
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the data is written into *(lct->reslen).
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RETURNS
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This function returns 0 if no errors occur. If an error occurs, -1
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is returned and errno is set appropriately:
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EFAULT Invalid user space pointer was passed
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ENXIO Invalid IOP number
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ENOBUFS Buffer not large enough. If this occurs, the required
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buffer length is written into *(lct->reslen)
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VI. Settting Parameters
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SYNOPSIS
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ioctl(fd, I2OPARMSET, struct i2o_parm_setget *ops);
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struct i2o_cmd_psetget
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{
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u32 iop; /* IOP unit number */
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u32 tid; /* Target device TID */
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void *opbuf; /* Operation List buffer */
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u32 oplen; /* Operation List buffer length in bytes */
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void *resbuf; /* Result List buffer */
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u32 *reslen; /* Result List buffer length in bytes */
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};
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DESCRIPTION
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This function posts a UtilParamsSet message to the device identified
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by ops->iop and ops->tid. The operation list for the message is
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sent through the ops->opbuf buffer, and the result list is written
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into the buffer pointed to by ops->resbuf. The number of bytes
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written is placed into *(ops->reslen).
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RETURNS
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The return value is the size in bytes of the data written into
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ops->resbuf if no errors occur. If an error occurs, -1 is returned
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and errno is set appropriatly:
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EFAULT Invalid user space pointer was passed
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ENXIO Invalid IOP number
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ENOBUFS Buffer not large enough. If this occurs, the required
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buffer length is written into *(ops->reslen)
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ETIMEDOUT Timeout waiting for reply message
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ENOMEM Kernel memory allocation error
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A return value of 0 does not mean that the value was actually
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changed properly on the IOP. The user should check the result
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list to determine the specific status of the transaction.
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VII. Getting Parameters
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SYNOPSIS
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ioctl(fd, I2OPARMGET, struct i2o_parm_setget *ops);
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struct i2o_parm_setget
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{
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u32 iop; /* IOP unit number */
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u32 tid; /* Target device TID */
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void *opbuf; /* Operation List buffer */
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u32 oplen; /* Operation List buffer length in bytes */
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void *resbuf; /* Result List buffer */
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u32 *reslen; /* Result List buffer length in bytes */
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};
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DESCRIPTION
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This function posts a UtilParamsGet message to the device identified
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by ops->iop and ops->tid. The operation list for the message is
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sent through the ops->opbuf buffer, and the result list is written
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into the buffer pointed to by ops->resbuf. The actual size of data
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written is placed into *(ops->reslen).
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RETURNS
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EFAULT Invalid user space pointer was passed
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ENXIO Invalid IOP number
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ENOBUFS Buffer not large enough. If this occurs, the required
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buffer length is written into *(ops->reslen)
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ETIMEDOUT Timeout waiting for reply message
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ENOMEM Kernel memory allocation error
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A return value of 0 does not mean that the value was actually
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properly retrieved. The user should check the result list
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to determine the specific status of the transaction.
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VIII. Downloading Software
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SYNOPSIS
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ioctl(fd, I2OSWDL, struct i2o_sw_xfer *sw);
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struct i2o_sw_xfer
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{
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u32 iop; /* IOP unit number */
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u8 flags; /* DownloadFlags field */
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u8 sw_type; /* Software type */
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u32 sw_id; /* Software ID */
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void *buf; /* Pointer to software buffer */
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u32 *swlen; /* Length of software buffer */
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u32 *maxfrag; /* Number of fragments */
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u32 *curfrag; /* Current fragment number */
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};
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DESCRIPTION
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This function downloads a software fragment pointed by sw->buf
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to the iop identified by sw->iop. The DownloadFlags, SwID, SwType
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and SwSize fields of the ExecSwDownload message are filled in with
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the values of sw->flags, sw->sw_id, sw->sw_type and *(sw->swlen).
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The fragments _must_ be sent in order and be 8K in size. The last
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fragment _may_ be shorter, however. The kernel will compute its
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size based on information in the sw->swlen field.
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Please note that SW transfers can take a long time.
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RETURNS
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This function returns 0 no errors occur. If an error occurs, -1
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is returned and errno is set appropriatly:
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EFAULT Invalid user space pointer was passed
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ENXIO Invalid IOP number
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ETIMEDOUT Timeout waiting for reply message
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ENOMEM Kernel memory allocation error
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IX. Uploading Software
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SYNOPSIS
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ioctl(fd, I2OSWUL, struct i2o_sw_xfer *sw);
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struct i2o_sw_xfer
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{
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u32 iop; /* IOP unit number */
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u8 flags; /* UploadFlags */
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u8 sw_type; /* Software type */
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u32 sw_id; /* Software ID */
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void *buf; /* Pointer to software buffer */
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u32 *swlen; /* Length of software buffer */
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u32 *maxfrag; /* Number of fragments */
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u32 *curfrag; /* Current fragment number */
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};
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DESCRIPTION
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This function uploads a software fragment from the IOP identified
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by sw->iop, sw->sw_type, sw->sw_id and optionally sw->swlen fields.
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The UploadFlags, SwID, SwType and SwSize fields of the ExecSwUpload
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message are filled in with the values of sw->flags, sw->sw_id,
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sw->sw_type and *(sw->swlen).
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The fragments _must_ be requested in order and be 8K in size. The
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user is responsible for allocating memory pointed by sw->buf. The
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last fragment _may_ be shorter.
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Please note that SW transfers can take a long time.
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RETURNS
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This function returns 0 if no errors occur. If an error occurs, -1
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is returned and errno is set appropriatly:
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EFAULT Invalid user space pointer was passed
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ENXIO Invalid IOP number
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ETIMEDOUT Timeout waiting for reply message
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ENOMEM Kernel memory allocation error
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X. Removing Software
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SYNOPSIS
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ioctl(fd, I2OSWDEL, struct i2o_sw_xfer *sw);
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struct i2o_sw_xfer
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{
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u32 iop; /* IOP unit number */
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u8 flags; /* RemoveFlags */
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u8 sw_type; /* Software type */
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u32 sw_id; /* Software ID */
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void *buf; /* Unused */
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u32 *swlen; /* Length of the software data */
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u32 *maxfrag; /* Unused */
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u32 *curfrag; /* Unused */
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};
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DESCRIPTION
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This function removes software from the IOP identified by sw->iop.
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The RemoveFlags, SwID, SwType and SwSize fields of the ExecSwRemove message
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are filled in with the values of sw->flags, sw->sw_id, sw->sw_type and
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*(sw->swlen). Give zero in *(sw->len) if the value is unknown. IOP uses
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*(sw->swlen) value to verify correct identication of the module to remove.
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The actual size of the module is written into *(sw->swlen).
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RETURNS
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This function returns 0 if no errors occur. If an error occurs, -1
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is returned and errno is set appropriatly:
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EFAULT Invalid user space pointer was passed
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ENXIO Invalid IOP number
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ETIMEDOUT Timeout waiting for reply message
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ENOMEM Kernel memory allocation error
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X. Validating Configuration
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SYNOPSIS
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ioctl(fd, I2OVALIDATE, int *iop);
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u32 iop;
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DESCRIPTION
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This function posts an ExecConfigValidate message to the controller
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identified by iop. This message indicates that the current
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configuration is accepted. The iop changes the status of suspect drivers
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to valid and may delete old drivers from its store.
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RETURNS
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This function returns 0 if no erro occur. If an error occurs, -1 is
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returned and errno is set appropriatly:
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ETIMEDOUT Timeout waiting for reply message
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ENXIO Invalid IOP number
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XI. Configuration Dialog
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SYNOPSIS
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ioctl(fd, I2OHTML, struct i2o_html *htquery);
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struct i2o_html
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{
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u32 iop; /* IOP unit number */
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u32 tid; /* Target device ID */
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u32 page; /* HTML page */
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void *resbuf; /* Buffer for reply HTML page */
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u32 *reslen; /* Length in bytes of reply buffer */
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void *qbuf; /* Pointer to HTTP query string */
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u32 qlen; /* Length in bytes of query string buffer */
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};
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DESCRIPTION
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This function posts an UtilConfigDialog message to the device identified
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by htquery->iop and htquery->tid. The requested HTML page number is
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provided by the htquery->page field, and the resultant data is stored
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in the buffer pointed to by htquery->resbuf. If there is an HTTP query
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string that is to be sent to the device, it should be sent in the buffer
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pointed to by htquery->qbuf. If there is no query string, this field
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should be set to NULL. The actual size of the reply received is written
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into *(htquery->reslen).
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RETURNS
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This function returns 0 if no error occur. If an error occurs, -1
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is returned and errno is set appropriatly:
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EFAULT Invalid user space pointer was passed
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ENXIO Invalid IOP number
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ENOBUFS Buffer not large enough. If this occurs, the required
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buffer length is written into *(ops->reslen)
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ETIMEDOUT Timeout waiting for reply message
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ENOMEM Kernel memory allocation error
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XII. Events
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In the process of determining this. Current idea is to have use
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the select() interface to allow user apps to periodically poll
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the /dev/i2o/ctl device for events. When select() notifies the user
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that an event is available, the user would call read() to retrieve
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a list of all the events that are pending for the specific device.
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=============================================================================
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Revision History
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=============================================================================
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Rev 0.1 - 04/01/99
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- Initial revision
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Rev 0.2 - 04/06/99
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- Changed return values to match UNIX ioctl() standard. Only return values
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are 0 and -1. All errors are reported through errno.
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- Added summary of proposed possible event interfaces
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Rev 0.3 - 04/20/99
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- Changed all ioctls() to use pointers to user data instead of actual data
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- Updated error values to match the code
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