linux/include/scsi/sg.h
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   1/* SPDX-License-Identifier: GPL-2.0 */
   2#ifndef _SCSI_GENERIC_H
   3#define _SCSI_GENERIC_H
   4
   5#include <linux/compiler.h>
   6
   7/*
   8 * History:
   9 *  Started: Aug 9 by Lawrence Foard (entropy@world.std.com), to allow user
  10 *   process control of SCSI devices.
  11 *  Development Sponsored by Killy Corp. NY NY
  12 *
  13 * Original driver (sg.h):
  14 *       Copyright (C) 1992 Lawrence Foard
  15 * Version 2 and 3 extensions to driver:
  16 *      Copyright (C) 1998 - 2014 Douglas Gilbert
  17 *
  18 *  Version: 3.5.36 (20140603)
  19 *  This version is for 2.6 and 3 series kernels.
  20 *
  21 * Documentation
  22 * =============
  23 * A web site for the SG device driver can be found at:
  24 *      http://sg.danny.cz/sg  [alternatively check the MAINTAINERS file]
  25 * The documentation for the sg version 3 driver can be found at:
  26 *      http://sg.danny.cz/sg/p/sg_v3_ho.html
  27 * Also see: <kernel_source>/Documentation/scsi/scsi-generic.rst
  28 *
  29 * For utility and test programs see: http://sg.danny.cz/sg/sg3_utils.html
  30 */
  31
  32#ifdef __KERNEL__
  33extern int sg_big_buff; /* for sysctl */
  34#endif
  35
  36
  37typedef struct sg_iovec /* same structure as used by readv() Linux system */
  38{                       /* call. It defines one scatter-gather element. */
  39    void __user *iov_base;      /* Starting address  */
  40    size_t iov_len;             /* Length in bytes  */
  41} sg_iovec_t;
  42
  43
  44typedef struct sg_io_hdr
  45{
  46    int interface_id;           /* [i] 'S' for SCSI generic (required) */
  47    int dxfer_direction;        /* [i] data transfer direction  */
  48    unsigned char cmd_len;      /* [i] SCSI command length */
  49    unsigned char mx_sb_len;    /* [i] max length to write to sbp */
  50    unsigned short iovec_count; /* [i] 0 implies no scatter gather */
  51    unsigned int dxfer_len;     /* [i] byte count of data transfer */
  52    void __user *dxferp;        /* [i], [*io] points to data transfer memory
  53                                              or scatter gather list */
  54    unsigned char __user *cmdp; /* [i], [*i] points to command to perform */
  55    void __user *sbp;           /* [i], [*o] points to sense_buffer memory */
  56    unsigned int timeout;       /* [i] MAX_UINT->no timeout (unit: millisec) */
  57    unsigned int flags;         /* [i] 0 -> default, see SG_FLAG... */
  58    int pack_id;                /* [i->o] unused internally (normally) */
  59    void __user * usr_ptr;      /* [i->o] unused internally */
  60    unsigned char status;       /* [o] scsi status */
  61    unsigned char masked_status;/* [o] shifted, masked scsi status */
  62    unsigned char msg_status;   /* [o] messaging level data (optional) */
  63    unsigned char sb_len_wr;    /* [o] byte count actually written to sbp */
  64    unsigned short host_status; /* [o] errors from host adapter */
  65    unsigned short driver_status;/* [o] errors from software driver */
  66    int resid;                  /* [o] dxfer_len - actual_transferred */
  67    unsigned int duration;      /* [o] time taken by cmd (unit: millisec) */
  68    unsigned int info;          /* [o] auxiliary information */
  69} sg_io_hdr_t;  /* 64 bytes long (on i386) */
  70
  71#if defined(__KERNEL__)
  72#include <linux/compat.h>
  73
  74struct compat_sg_io_hdr {
  75        compat_int_t interface_id;      /* [i] 'S' for SCSI generic (required) */
  76        compat_int_t dxfer_direction;   /* [i] data transfer direction  */
  77        unsigned char cmd_len;          /* [i] SCSI command length ( <= 16 bytes) */
  78        unsigned char mx_sb_len;        /* [i] max length to write to sbp */
  79        unsigned short iovec_count;     /* [i] 0 implies no scatter gather */
  80        compat_uint_t dxfer_len;        /* [i] byte count of data transfer */
  81        compat_uint_t dxferp;           /* [i], [*io] points to data transfer memory
  82                                                or scatter gather list */
  83        compat_uptr_t cmdp;             /* [i], [*i] points to command to perform */
  84        compat_uptr_t sbp;              /* [i], [*o] points to sense_buffer memory */
  85        compat_uint_t timeout;          /* [i] MAX_UINT->no timeout (unit: millisec) */
  86        compat_uint_t flags;            /* [i] 0 -> default, see SG_FLAG... */
  87        compat_int_t pack_id;           /* [i->o] unused internally (normally) */
  88        compat_uptr_t usr_ptr;          /* [i->o] unused internally */
  89        unsigned char status;           /* [o] scsi status */
  90        unsigned char masked_status;    /* [o] shifted, masked scsi status */
  91        unsigned char msg_status;       /* [o] messaging level data (optional) */
  92        unsigned char sb_len_wr;        /* [o] byte count actually written to sbp */
  93        unsigned short host_status;     /* [o] errors from host adapter */
  94        unsigned short driver_status;   /* [o] errors from software driver */
  95        compat_int_t resid;             /* [o] dxfer_len - actual_transferred */
  96        compat_uint_t duration;         /* [o] time taken by cmd (unit: millisec) */
  97        compat_uint_t info;             /* [o] auxiliary information */
  98};
  99#endif
 100
 101#define SG_INTERFACE_ID_ORIG 'S'
 102
 103/* Use negative values to flag difference from original sg_header structure */
 104#define SG_DXFER_NONE (-1)      /* e.g. a SCSI Test Unit Ready command */
 105#define SG_DXFER_TO_DEV (-2)    /* e.g. a SCSI WRITE command */
 106#define SG_DXFER_FROM_DEV (-3)  /* e.g. a SCSI READ command */
 107#define SG_DXFER_TO_FROM_DEV (-4) /* treated like SG_DXFER_FROM_DEV with the
 108                                   additional property than during indirect
 109                                   IO the user buffer is copied into the
 110                                   kernel buffers before the transfer */
 111#define SG_DXFER_UNKNOWN (-5)   /* Unknown data direction */
 112
 113/* following flag values can be "or"-ed together */
 114#define SG_FLAG_DIRECT_IO 1     /* default is indirect IO */
 115#define SG_FLAG_UNUSED_LUN_INHIBIT 2   /* default is overwrite lun in SCSI */
 116                                /* command block (when <= SCSI_2) */
 117#define SG_FLAG_MMAP_IO 4       /* request memory mapped IO */
 118#define SG_FLAG_NO_DXFER 0x10000 /* no transfer of kernel buffers to/from */
 119                                /* user space (debug indirect IO) */
 120/* defaults:: for sg driver: Q_AT_HEAD; for block layer: Q_AT_TAIL */
 121#define SG_FLAG_Q_AT_TAIL 0x10
 122#define SG_FLAG_Q_AT_HEAD 0x20
 123
 124/* following 'info' values are "or"-ed together */
 125#define SG_INFO_OK_MASK 0x1
 126#define SG_INFO_OK 0x0          /* no sense, host nor driver "noise" */
 127#define SG_INFO_CHECK 0x1       /* something abnormal happened */
 128
 129#define SG_INFO_DIRECT_IO_MASK 0x6
 130#define SG_INFO_INDIRECT_IO 0x0 /* data xfer via kernel buffers (or no xfer) */
 131#define SG_INFO_DIRECT_IO 0x2   /* direct IO requested and performed */
 132#define SG_INFO_MIXED_IO 0x4    /* part direct, part indirect IO */
 133
 134/*
 135 * Obsolete DRIVER_SENSE driver byte
 136 *
 137 * Originally the SCSI midlayer would set the DRIVER_SENSE driver byte when
 138 * a sense code was generated and a sense buffer was allocated.
 139 * However, as nowadays every scsi command has a sense code allocated this
 140 * distinction became moot as one could check the sense buffer directly.
 141 * Consequently this byte is not set anymore from the midlayer, but SG will
 142 * keep setting this byte to be compatible with previous releases.
 143 */
 144#define DRIVER_SENSE 0x08
 145/* Obsolete driver_byte() declaration */
 146#define driver_byte(result) (((result) >> 24) & 0xff)
 147
 148/*
 149 *  Original linux SCSI Status codes. They are shifted 1 bit right
 150 *  from those found in the SCSI standards.
 151 */
 152
 153#define GOOD                 0x00
 154#define CHECK_CONDITION      0x01
 155#define CONDITION_GOOD       0x02
 156#define BUSY                 0x04
 157#define INTERMEDIATE_GOOD    0x08
 158#define INTERMEDIATE_C_GOOD  0x0a
 159#define RESERVATION_CONFLICT 0x0c
 160#define COMMAND_TERMINATED   0x11
 161#define QUEUE_FULL           0x14
 162#define ACA_ACTIVE           0x18
 163#define TASK_ABORTED         0x20
 164
 165/* Obsolete status_byte() declaration */
 166#define status_byte(result) (((result) >> 1) & 0x7f)
 167
 168typedef struct sg_scsi_id { /* used by SG_GET_SCSI_ID ioctl() */
 169    int host_no;        /* as in "scsi<n>" where 'n' is one of 0, 1, 2 etc */
 170    int channel;
 171    int scsi_id;        /* scsi id of target device */
 172    int lun;
 173    int scsi_type;      /* TYPE_... defined in scsi/scsi.h */
 174    short h_cmd_per_lun;/* host (adapter) maximum commands per lun */
 175    short d_queue_depth;/* device (or adapter) maximum queue length */
 176    int unused[2];      /* probably find a good use, set 0 for now */
 177} sg_scsi_id_t; /* 32 bytes long on i386 */
 178
 179typedef struct sg_req_info { /* used by SG_GET_REQUEST_TABLE ioctl() */
 180    char req_state;     /* 0 -> not used, 1 -> written, 2 -> ready to read */
 181    char orphan;        /* 0 -> normal request, 1 -> from interrupted SG_IO */
 182    char sg_io_owned;   /* 0 -> complete with read(), 1 -> owned by SG_IO */
 183    char problem;       /* 0 -> no problem detected, 1 -> error to report */
 184    int pack_id;        /* pack_id associated with request */
 185    void __user *usr_ptr;     /* user provided pointer (in new interface) */
 186    unsigned int duration; /* millisecs elapsed since written (req_state==1)
 187                              or request duration (req_state==2) */
 188    int unused;
 189} sg_req_info_t; /* 20 bytes long on i386 */
 190
 191
 192/* IOCTLs: Those ioctls that are relevant to the SG 3.x drivers follow.
 193 [Those that only apply to the SG 2.x drivers are at the end of the file.]
 194 (_GET_s yield result via 'int *' 3rd argument unless otherwise indicated) */
 195
 196#define SG_EMULATED_HOST 0x2203 /* true for emulated host adapter (ATAPI) */
 197
 198/* Used to configure SCSI command transformation layer for ATAPI devices */
 199/* Only supported by the ide-scsi driver */
 200#define SG_SET_TRANSFORM 0x2204 /* N.B. 3rd arg is not pointer but value: */
 201                      /* 3rd arg = 0 to disable transform, 1 to enable it */
 202#define SG_GET_TRANSFORM 0x2205
 203
 204#define SG_SET_RESERVED_SIZE 0x2275  /* request a new reserved buffer size */
 205#define SG_GET_RESERVED_SIZE 0x2272  /* actual size of reserved buffer */
 206
 207/* The following ioctl has a 'sg_scsi_id_t *' object as its 3rd argument. */
 208#define SG_GET_SCSI_ID 0x2276   /* Yields fd's bus, chan, dev, lun + type */
 209/* SCSI id information can also be obtained from SCSI_IOCTL_GET_IDLUN */
 210
 211/* Override host setting and always DMA using low memory ( <16MB on i386) */
 212#define SG_SET_FORCE_LOW_DMA 0x2279  /* 0-> use adapter setting, 1-> force */
 213#define SG_GET_LOW_DMA 0x227a   /* 0-> use all ram for dma; 1-> low dma ram */
 214
 215/* When SG_SET_FORCE_PACK_ID set to 1, pack_id is input to read() which
 216   tries to fetch a packet with a matching pack_id, waits, or returns EAGAIN.
 217   If pack_id is -1 then read oldest waiting. When ...FORCE_PACK_ID set to 0
 218   then pack_id ignored by read() and oldest readable fetched. */
 219#define SG_SET_FORCE_PACK_ID 0x227b
 220#define SG_GET_PACK_ID 0x227c /* Yields oldest readable pack_id (or -1) */
 221
 222#define SG_GET_NUM_WAITING 0x227d /* Number of commands awaiting read() */
 223
 224/* Yields max scatter gather tablesize allowed by current host adapter */
 225#define SG_GET_SG_TABLESIZE 0x227F  /* 0 implies can't do scatter gather */
 226
 227#define SG_GET_VERSION_NUM 0x2282 /* Example: version 2.1.34 yields 20134 */
 228
 229/* Returns -EBUSY if occupied. 3rd argument pointer to int (see next) */
 230#define SG_SCSI_RESET 0x2284
 231/* Associated values that can be given to SG_SCSI_RESET follow.
 232 * SG_SCSI_RESET_NO_ESCALATE may be OR-ed to the _DEVICE, _TARGET, _BUS
 233 * or _HOST reset value so only that action is attempted. */
 234#define         SG_SCSI_RESET_NOTHING   0
 235#define         SG_SCSI_RESET_DEVICE    1
 236#define         SG_SCSI_RESET_BUS       2
 237#define         SG_SCSI_RESET_HOST      3
 238#define         SG_SCSI_RESET_TARGET    4
 239#define         SG_SCSI_RESET_NO_ESCALATE       0x100
 240
 241/* synchronous SCSI command ioctl, (only in version 3 interface) */
 242#define SG_IO 0x2285   /* similar effect as write() followed by read() */
 243
 244#define SG_GET_REQUEST_TABLE 0x2286   /* yields table of active requests */
 245
 246/* How to treat EINTR during SG_IO ioctl(), only in SG 3.x series */
 247#define SG_SET_KEEP_ORPHAN 0x2287 /* 1 -> hold for read(), 0 -> drop (def) */
 248#define SG_GET_KEEP_ORPHAN 0x2288
 249
 250/* yields scsi midlevel's access_count for this SCSI device */
 251#define SG_GET_ACCESS_COUNT 0x2289  
 252
 253
 254#define SG_SCATTER_SZ (8 * 4096)
 255/* Largest size (in bytes) a single scatter-gather list element can have.
 256   The value used by the driver is 'max(SG_SCATTER_SZ, PAGE_SIZE)'.
 257   This value should be a power of 2 (and may be rounded up internally).
 258   If scatter-gather is not supported by adapter then this value is the
 259   largest data block that can be read/written by a single scsi command. */
 260
 261#define SG_DEFAULT_RETRIES 0
 262
 263/* Defaults, commented if they differ from original sg driver */
 264#define SG_DEF_FORCE_PACK_ID 0
 265#define SG_DEF_KEEP_ORPHAN 0
 266#define SG_DEF_RESERVED_SIZE SG_SCATTER_SZ /* load time option */
 267
 268/* maximum outstanding requests, write() yields EDOM if exceeded */
 269#define SG_MAX_QUEUE 16
 270
 271#define SG_BIG_BUFF SG_DEF_RESERVED_SIZE    /* for backward compatibility */
 272
 273/* Alternate style type names, "..._t" variants preferred */
 274typedef struct sg_io_hdr Sg_io_hdr;
 275typedef struct sg_io_vec Sg_io_vec;
 276typedef struct sg_scsi_id Sg_scsi_id;
 277typedef struct sg_req_info Sg_req_info;
 278
 279
 280/* vvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvv */
 281/*   The older SG interface based on the 'sg_header' structure follows.   */
 282/* ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ */
 283
 284#define SG_MAX_SENSE 16   /* this only applies to the sg_header interface */
 285
 286struct sg_header
 287{
 288    int pack_len;    /* [o] reply_len (ie useless), ignored as input */
 289    int reply_len;   /* [i] max length of expected reply (inc. sg_header) */
 290    int pack_id;     /* [io] id number of packet (use ints >= 0) */
 291    int result;      /* [o] 0==ok, else (+ve) Unix errno (best ignored) */
 292    unsigned int twelve_byte:1;
 293        /* [i] Force 12 byte command length for group 6 & 7 commands  */
 294    unsigned int target_status:5;   /* [o] scsi status from target */
 295    unsigned int host_status:8;     /* [o] host status (see "DID" codes) */
 296    unsigned int driver_status:8;   /* [o] driver status+suggestion */
 297    unsigned int other_flags:10;    /* unused */
 298    unsigned char sense_buffer[SG_MAX_SENSE]; /* [o] Output in 3 cases:
 299           when target_status is CHECK_CONDITION or
 300           when target_status is COMMAND_TERMINATED or
 301           when (driver_status & DRIVER_SENSE) is true. */
 302};      /* This structure is 36 bytes long on i386 */
 303
 304
 305/* IOCTLs: The following are not required (or ignored) when the sg_io_hdr_t
 306           interface is used. They are kept for backward compatibility with
 307           the original and version 2 drivers. */
 308
 309#define SG_SET_TIMEOUT 0x2201  /* unit: jiffies (10ms on i386) */
 310#define SG_GET_TIMEOUT 0x2202  /* yield timeout as _return_ value */
 311
 312/* Get/set command queuing state per fd (default is SG_DEF_COMMAND_Q.
 313   Each time a sg_io_hdr_t object is seen on this file descriptor, this
 314   command queuing flag is set on (overriding the previous setting). */
 315#define SG_GET_COMMAND_Q 0x2270   /* Yields 0 (queuing off) or 1 (on) */
 316#define SG_SET_COMMAND_Q 0x2271   /* Change queuing state with 0 or 1 */
 317
 318/* Turn on/off error sense trace (1 and 0 respectively, default is off).
 319   Try using: "# cat /proc/scsi/sg/debug" instead in the v3 driver */
 320#define SG_SET_DEBUG 0x227e    /* 0 -> turn off debug */
 321
 322#define SG_NEXT_CMD_LEN 0x2283  /* override SCSI command length with given
 323                   number on the next write() on this file descriptor */
 324
 325
 326/* Defaults, commented if they differ from original sg driver */
 327#ifdef __KERNEL__
 328#define SG_DEFAULT_TIMEOUT_USER (60*USER_HZ) /* HZ == 'jiffies in 1 second' */
 329#else
 330#define SG_DEFAULT_TIMEOUT      (60*HZ)      /* HZ == 'jiffies in 1 second' */
 331#endif
 332
 333#define SG_DEF_COMMAND_Q 0     /* command queuing is always on when
 334                                  the new interface is used */
 335#define SG_DEF_UNDERRUN_FLAG 0
 336
 337#endif
 338