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+/* Copyright (C) 1997, 1998, 1999, 2000 Free Software Foundation, Inc.
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+ This file is part of the GNU C Library.
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+
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+ The GNU C Library is free software; you can redistribute it and/or
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+ modify it under the terms of the GNU Lesser General Public
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+ License as published by the Free Software Foundation; either
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+ version 2.1 of the License, or (at your option) any later version.
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+
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+ The GNU C Library is distributed in the hope that it will be useful,
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+ but WITHOUT ANY WARRANTY; without even the implied warranty of
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+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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+ Lesser General Public License for more details.
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+
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+ You should have received a copy of the GNU Lesser General Public
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+ License along with the GNU C Library; if not, write to the Free
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+ Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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+ 02111-1307 USA. */
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+
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+/*
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+ History:
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+ Started: Aug 9 by Lawrence Foard (entropy@world.std.com), to allow user
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+ process control of SCSI devices.
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+ Development Sponsored by Killy Corp. NY NY
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+*/
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+
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+#ifndef _SCSI_SG_H
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+#define _SCSI_SG_H 1
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+
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+#include <features.h>
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+
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+
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+/* New interface introduced in the 3.x SG drivers follows */
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+
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+/* Same structure as used by readv() Linux system call. It defines one
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+ scatter-gather element. */
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+typedef struct sg_iovec
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+{
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+ void * iov_base; /* Starting address */
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+ size_t iov_len; /* Length in bytes */
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+} sg_iovec_t;
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+
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+
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+typedef struct sg_io_hdr
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+{
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+ int interface_id; /* [i] 'S' for SCSI generic (required) */
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+ int dxfer_direction; /* [i] data transfer direction */
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+ unsigned char cmd_len; /* [i] SCSI command length ( <= 16 bytes) */
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+ unsigned char mx_sb_len; /* [i] max length to write to sbp */
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+ unsigned short int iovec_count; /* [i] 0 implies no scatter gather */
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+ unsigned int dxfer_len; /* [i] byte count of data transfer */
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+ void * dxferp; /* [i], [*io] points to data transfer memory
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+ or scatter gather list */
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+ unsigned char * cmdp; /* [i], [*i] points to command to perform */
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+ unsigned char * sbp; /* [i], [*o] points to sense_buffer memory */
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+ unsigned int timeout; /* [i] MAX_UINT->no timeout (unit: millisec) */
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+ unsigned int flags; /* [i] 0 -> default, see SG_FLAG... */
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+ int pack_id; /* [i->o] unused internally (normally) */
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+ void * usr_ptr; /* [i->o] unused internally */
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+ unsigned char status; /* [o] scsi status */
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+ unsigned char masked_status;/* [o] shifted, masked scsi status */
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+ unsigned char msg_status; /* [o] messaging level data (optional) */
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+ unsigned char sb_len_wr; /* [o] byte count actually written to sbp */
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+ unsigned short int host_status; /* [o] errors from host adapter */
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+ unsigned short int driver_status;/* [o] errors from software driver */
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+ int resid; /* [o] dxfer_len - actual_transferred */
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+ unsigned int duration; /* [o] time taken by cmd (unit: millisec) */
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+ unsigned int info; /* [o] auxiliary information */
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+} sg_io_hdr_t;
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+
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+
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+/* Use negative values to flag difference from original sg_header structure. */
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+#define SG_DXFER_NONE -1 /* e.g. a SCSI Test Unit Ready command */
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+#define SG_DXFER_TO_DEV -2 /* e.g. a SCSI WRITE command */
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+#define SG_DXFER_FROM_DEV -3 /* e.g. a SCSI READ command */
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+#define SG_DXFER_TO_FROM_DEV -4 /* treated like SG_DXFER_FROM_DEV with the
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+ additional property than during indirect
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+ IO the user buffer is copied into the
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+ kernel buffers before the transfer */
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+
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+
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+/* following flag values can be "or"-ed together */
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+#define SG_FLAG_DIRECT_IO 1 /* default is indirect IO */
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+#define SG_FLAG_LUN_INHIBIT 2 /* default is to put device's lun into */
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+ /* the 2nd byte of SCSI command */
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+#define SG_FLAG_NO_DXFER 0x10000 /* no transfer of kernel buffers to/from */
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+ /* user space (debug indirect IO) */
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+
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+/* The following 'info' values are "or"-ed together. */
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+#define SG_INFO_OK_MASK 0x1
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+#define SG_INFO_OK 0x0 /* no sense, host nor driver "noise" */
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+#define SG_INFO_CHECK 0x1 /* something abnormal happened */
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+
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+#define SG_INFO_DIRECT_IO_MASK 0x6
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+#define SG_INFO_INDIRECT_IO 0x0 /* data xfer via kernel buffers (or no xfer) */
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+#define SG_INFO_DIRECT_IO 0x2 /* direct IO requested and performed */
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+#define SG_INFO_MIXED_IO 0x4 /* part direct, part indirect IO */
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+
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+
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+/* Request information about a specific SG device, used by
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+ SG_GET_SCSI_ID ioctl (). */
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+struct sg_scsi_id {
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+ /* Host number as in "scsi<n>" where 'n' is one of 0, 1, 2 etc. */
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+ int host_no;
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+ int channel;
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+ /* SCSI id of target device. */
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+ int scsi_id;
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+ int lun;
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+ /* TYPE_... defined in <scsi/scsi.h>. */
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+ int scsi_type;
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+ /* Host (adapter) maximum commands per lun. */
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+ short int h_cmd_per_lun;
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+ /* Device (or adapter) maximum queue length. */
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+ short int d_queue_depth;
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+ /* Unused, set to 0 for now. */
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+ int unused[2];
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+};
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+
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+/* Used by SG_GET_REQUEST_TABLE ioctl(). */
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+typedef struct sg_req_info {
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+ char req_state; /* 0 -> not used, 1 -> written, 2 -> ready to read */
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+ char orphan; /* 0 -> normal request, 1 -> from interruped SG_IO */
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+ char sg_io_owned; /* 0 -> complete with read(), 1 -> owned by SG_IO */
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+ char problem; /* 0 -> no problem detected, 1 -> error to report */
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+ int pack_id; /* pack_id associated with request */
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+ void * usr_ptr; /* user provided pointer (in new interface) */
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+ unsigned int duration; /* millisecs elapsed since written (req_state==1)
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+ or request duration (req_state==2) */
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+ int unused;
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+} sg_req_info_t;
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+
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+
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+/* IOCTLs: Those ioctls that are relevant to the SG 3.x drivers follow.
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+ [Those that only apply to the SG 2.x drivers are at the end of the file.]
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+ (_GET_s yield result via 'int *' 3rd argument unless otherwise indicated) */
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+
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+#define SG_EMULATED_HOST 0x2203 /* true for emulated host adapter (ATAPI) */
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+
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+/* Used to configure SCSI command transformation layer for ATAPI devices */
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+/* Only supported by the ide-scsi driver */
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+#define SG_SET_TRANSFORM 0x2204 /* N.B. 3rd arg is not pointer but value: */
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+ /* 3rd arg = 0 to disable transform, 1 to enable it */
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+#define SG_GET_TRANSFORM 0x2205
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+
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+#define SG_SET_RESERVED_SIZE 0x2275 /* request a new reserved buffer size */
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+#define SG_GET_RESERVED_SIZE 0x2272 /* actual size of reserved buffer */
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+
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+/* The following ioctl has a 'sg_scsi_id_t *' object as its 3rd argument. */
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+#define SG_GET_SCSI_ID 0x2276 /* Yields fd's bus, chan, dev, lun + type */
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+/* SCSI id information can also be obtained from SCSI_IOCTL_GET_IDLUN */
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+
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+/* Override host setting and always DMA using low memory ( <16MB on i386) */
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+#define SG_SET_FORCE_LOW_DMA 0x2279 /* 0-> use adapter setting, 1-> force */
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+#define SG_GET_LOW_DMA 0x227a /* 0-> use all ram for dma; 1-> low dma ram */
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+
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+/* When SG_SET_FORCE_PACK_ID set to 1, pack_id is input to read() which
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+ tries to fetch a packet with a matching pack_id, waits, or returns EAGAIN.
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+ If pack_id is -1 then read oldest waiting. When ...FORCE_PACK_ID set to 0
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+ then pack_id ignored by read() and oldest readable fetched. */
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+#define SG_SET_FORCE_PACK_ID 0x227b
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+#define SG_GET_PACK_ID 0x227c /* Yields oldest readable pack_id (or -1) */
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+
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+#define SG_GET_NUM_WAITING 0x227d /* Number of commands awaiting read() */
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+
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+/* Yields max scatter gather tablesize allowed by current host adapter */
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+#define SG_GET_SG_TABLESIZE 0x227F /* 0 implies can't do scatter gather */
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+
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+#define SG_GET_VERSION_NUM 0x2282 /* Example: version 2.1.34 yields 20134 */
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+
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+/* Returns -EBUSY if occupied. 3rd argument pointer to int (see next) */
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+#define SG_SCSI_RESET 0x2284
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+/* Associated values that can be given to SG_SCSI_RESET follow */
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+#define SG_SCSI_RESET_NOTHING 0
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+#define SG_SCSI_RESET_DEVICE 1
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+#define SG_SCSI_RESET_BUS 2
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+#define SG_SCSI_RESET_HOST 3
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+
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+/* synchronous SCSI command ioctl, (only in version 3 interface) */
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+#define SG_IO 0x2285 /* similar effect as write() followed by read() */
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+
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+#define SG_GET_REQUEST_TABLE 0x2286 /* yields table of active requests */
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+
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+/* How to treat EINTR during SG_IO ioctl(), only in SG 3.x series */
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+#define SG_SET_KEEP_ORPHAN 0x2287 /* 1 -> hold for read(), 0 -> drop (def) */
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+#define SG_GET_KEEP_ORPHAN 0x2288
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+
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+
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+#define SG_SCATTER_SZ (8 * 4096) /* PAGE_SIZE not available to user */
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+/* Largest size (in bytes) a single scatter-gather list element can have.
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+ The value must be a power of 2 and <= (PAGE_SIZE * 32) [131072 bytes on
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+ i386]. The minimum value is PAGE_SIZE. If scatter-gather not supported
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+ by adapter then this value is the largest data block that can be
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+ read/written by a single scsi command. The user can find the value of
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+ PAGE_SIZE by calling getpagesize() defined in unistd.h . */
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+
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+#define SG_DEFAULT_RETRIES 1
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+
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+/* Defaults, commented if they differ from original sg driver */
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+#define SG_DEF_FORCE_LOW_DMA 0 /* was 1 -> memory below 16MB on i386 */
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+#define SG_DEF_FORCE_PACK_ID 0
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+#define SG_DEF_KEEP_ORPHAN 0
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+#define SG_DEF_RESERVED_SIZE SG_SCATTER_SZ /* load time option */
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+
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+/* maximum outstanding requests, write() yields EDOM if exceeded */
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+#define SG_MAX_QUEUE 16
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+
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+#define SG_BIG_BUFF SG_DEF_RESERVED_SIZE /* for backward compatibility */
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+
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+/* Alternate style type names, "..._t" variants preferred */
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+typedef struct sg_io_hdr Sg_io_hdr;
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+typedef struct sg_io_vec Sg_io_vec;
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+typedef struct sg_scsi_id Sg_scsi_id;
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+typedef struct sg_req_info Sg_req_info;
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+
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+
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+/* vvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvv */
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+/* The older SG interface based on the 'sg_header' structure follows. */
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+/* ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ */
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+
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+#define SG_MAX_SENSE 16 /* this only applies to the sg_header interface */
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+
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+struct sg_header
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+ {
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+ /* Length of incoming packet (including header). */
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+ int pack_len;
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+ /* Maximal length of expected reply. */
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+ int reply_len;
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+ /* Id number of packet. */
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+ int pack_id;
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+ /* 0==ok, otherwise error number. */
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+ int result;
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+ /* Force 12 byte command length for group 6 & 7 commands. */
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+ unsigned int twelve_byte:1;
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+ /* SCSI status from target. */
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+ unsigned int target_status:5;
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+ /* Host status (see "DID" codes). */
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+ unsigned int host_status:8;
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+ /* Driver status+suggestion. */
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+ unsigned int driver_status:8;
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+ /* Unused. */
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+ unsigned int other_flags:10;
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+ /* Output in 3 cases:
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+ when target_status is CHECK_CONDITION or
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+ when target_status is COMMAND_TERMINATED or
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+ when (driver_status & DRIVER_SENSE) is true. */
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+ unsigned char sense_buffer[SG_MAX_SENSE];
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+ };
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+
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+
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+/* IOCTLs: The following are not required (or ignored) when the sg_io_hdr_t
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+ interface is used. They are kept for backward compatibility with
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+ the original and version 2 drivers. */
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+
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+#define SG_SET_TIMEOUT 0x2201 /* Set timeout; *(int *)arg==timeout. */
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+#define SG_GET_TIMEOUT 0x2202 /* Get timeout; return timeout. */
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+
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+/* Get/set command queuing state per fd (default is SG_DEF_COMMAND_Q). */
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+#define SG_GET_COMMAND_Q 0x2270 /* Yields 0 (queuing off) or 1 (on). */
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+#define SG_SET_COMMAND_Q 0x2271 /* Change queuing state with 0 or 1. */
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+
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+/* Turn on error sense trace (1..8), dump this device to log/console (9)
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+ or dump all sg device states ( >9 ) to log/console. */
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+#define SG_SET_DEBUG 0x227e /* 0 -> turn off debug */
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+
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+#define SG_NEXT_CMD_LEN 0x2283 /* Override SCSI command length with given
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+ number on the next write() on this file
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+ descriptor. */
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+
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+/* Defaults, commented if they differ from original sg driver */
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+#define SG_DEFAULT_TIMEOUT (60*HZ) /* HZ == 'jiffies in 1 second' */
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+#define SG_DEF_COMMAND_Q 0 /* command queuing is always on when
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+ the new interface is used */
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+#define SG_DEF_UNDERRUN_FLAG 0
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+
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+
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+#endif /* scsi/sg.h */
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Eric Andersen