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.txt 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#define SG_INTERFACE_ID_ORIG 'S' 72 73/* Use negative values to flag difference from original sg_header structure */ 74#define SG_DXFER_NONE (-1) /* e.g. a SCSI Test Unit Ready command */ 75#define SG_DXFER_TO_DEV (-2) /* e.g. a SCSI WRITE command */ 76#define SG_DXFER_FROM_DEV (-3) /* e.g. a SCSI READ command */ 77#define SG_DXFER_TO_FROM_DEV (-4) /* treated like SG_DXFER_FROM_DEV with the 78 additional property than during indirect 79 IO the user buffer is copied into the 80 kernel buffers before the transfer */ 81#define SG_DXFER_UNKNOWN (-5) /* Unknown data direction */ 82 83/* following flag values can be "or"-ed together */ 84#define SG_FLAG_DIRECT_IO 1 /* default is indirect IO */ 85#define SG_FLAG_UNUSED_LUN_INHIBIT 2 /* default is overwrite lun in SCSI */ 86 /* command block (when <= SCSI_2) */ 87#define SG_FLAG_MMAP_IO 4 /* request memory mapped IO */ 88#define SG_FLAG_NO_DXFER 0x10000 /* no transfer of kernel buffers to/from */ 89 /* user space (debug indirect IO) */ 90/* defaults:: for sg driver: Q_AT_HEAD; for block layer: Q_AT_TAIL */ 91#define SG_FLAG_Q_AT_TAIL 0x10 92#define SG_FLAG_Q_AT_HEAD 0x20 93 94/* following 'info' values are "or"-ed together */ 95#define SG_INFO_OK_MASK 0x1 96#define SG_INFO_OK 0x0 /* no sense, host nor driver "noise" */ 97#define SG_INFO_CHECK 0x1 /* something abnormal happened */ 98 99#define SG_INFO_DIRECT_IO_MASK 0x6 100#define SG_INFO_INDIRECT_IO 0x0 /* data xfer via kernel buffers (or no xfer) */ 101#define SG_INFO_DIRECT_IO 0x2 /* direct IO requested and performed */ 102#define SG_INFO_MIXED_IO 0x4 /* part direct, part indirect IO */ 103 104 105typedef struct sg_scsi_id { /* used by SG_GET_SCSI_ID ioctl() */ 106 int host_no; /* as in "scsi<n>" where 'n' is one of 0, 1, 2 etc */ 107 int channel; 108 int scsi_id; /* scsi id of target device */ 109 int lun; 110 int scsi_type; /* TYPE_... defined in scsi/scsi.h */ 111 short h_cmd_per_lun;/* host (adapter) maximum commands per lun */ 112 short d_queue_depth;/* device (or adapter) maximum queue length */ 113 int unused[2]; /* probably find a good use, set 0 for now */ 114} sg_scsi_id_t; /* 32 bytes long on i386 */ 115 116typedef struct sg_req_info { /* used by SG_GET_REQUEST_TABLE ioctl() */ 117 char req_state; /* 0 -> not used, 1 -> written, 2 -> ready to read */ 118 char orphan; /* 0 -> normal request, 1 -> from interruped SG_IO */ 119 char sg_io_owned; /* 0 -> complete with read(), 1 -> owned by SG_IO */ 120 char problem; /* 0 -> no problem detected, 1 -> error to report */ 121 int pack_id; /* pack_id associated with request */ 122 void __user *usr_ptr; /* user provided pointer (in new interface) */ 123 unsigned int duration; /* millisecs elapsed since written (req_state==1) 124 or request duration (req_state==2) */ 125 int unused; 126} sg_req_info_t; /* 20 bytes long on i386 */ 127 128 129/* IOCTLs: Those ioctls that are relevant to the SG 3.x drivers follow. 130 [Those that only apply to the SG 2.x drivers are at the end of the file.] 131 (_GET_s yield result via 'int *' 3rd argument unless otherwise indicated) */ 132 133#define SG_EMULATED_HOST 0x2203 /* true for emulated host adapter (ATAPI) */ 134 135/* Used to configure SCSI command transformation layer for ATAPI devices */ 136/* Only supported by the ide-scsi driver */ 137#define SG_SET_TRANSFORM 0x2204 /* N.B. 3rd arg is not pointer but value: */ 138 /* 3rd arg = 0 to disable transform, 1 to enable it */ 139#define SG_GET_TRANSFORM 0x2205 140 141#define SG_SET_RESERVED_SIZE 0x2275 /* request a new reserved buffer size */ 142#define SG_GET_RESERVED_SIZE 0x2272 /* actual size of reserved buffer */ 143 144/* The following ioctl has a 'sg_scsi_id_t *' object as its 3rd argument. */ 145#define SG_GET_SCSI_ID 0x2276 /* Yields fd's bus, chan, dev, lun + type */ 146/* SCSI id information can also be obtained from SCSI_IOCTL_GET_IDLUN */ 147 148/* Override host setting and always DMA using low memory ( <16MB on i386) */ 149#define SG_SET_FORCE_LOW_DMA 0x2279 /* 0-> use adapter setting, 1-> force */ 150#define SG_GET_LOW_DMA 0x227a /* 0-> use all ram for dma; 1-> low dma ram */ 151 152/* When SG_SET_FORCE_PACK_ID set to 1, pack_id is input to read() which 153 tries to fetch a packet with a matching pack_id, waits, or returns EAGAIN. 154 If pack_id is -1 then read oldest waiting. When ...FORCE_PACK_ID set to 0 155 then pack_id ignored by read() and oldest readable fetched. */ 156#define SG_SET_FORCE_PACK_ID 0x227b 157#define SG_GET_PACK_ID 0x227c /* Yields oldest readable pack_id (or -1) */ 158 159#define SG_GET_NUM_WAITING 0x227d /* Number of commands awaiting read() */ 160 161/* Yields max scatter gather tablesize allowed by current host adapter */ 162#define SG_GET_SG_TABLESIZE 0x227F /* 0 implies can't do scatter gather */ 163 164#define SG_GET_VERSION_NUM 0x2282 /* Example: version 2.1.34 yields 20134 */ 165 166/* Returns -EBUSY if occupied. 3rd argument pointer to int (see next) */ 167#define SG_SCSI_RESET 0x2284 168/* Associated values that can be given to SG_SCSI_RESET follow. 169 * SG_SCSI_RESET_NO_ESCALATE may be OR-ed to the _DEVICE, _TARGET, _BUS 170 * or _HOST reset value so only that action is attempted. */ 171#define SG_SCSI_RESET_NOTHING 0 172#define SG_SCSI_RESET_DEVICE 1 173#define SG_SCSI_RESET_BUS 2 174#define SG_SCSI_RESET_HOST 3 175#define SG_SCSI_RESET_TARGET 4 176#define SG_SCSI_RESET_NO_ESCALATE 0x100 177 178/* synchronous SCSI command ioctl, (only in version 3 interface) */ 179#define SG_IO 0x2285 /* similar effect as write() followed by read() */ 180 181#define SG_GET_REQUEST_TABLE 0x2286 /* yields table of active requests */ 182 183/* How to treat EINTR during SG_IO ioctl(), only in SG 3.x series */ 184#define SG_SET_KEEP_ORPHAN 0x2287 /* 1 -> hold for read(), 0 -> drop (def) */ 185#define SG_GET_KEEP_ORPHAN 0x2288 186 187/* yields scsi midlevel's access_count for this SCSI device */ 188#define SG_GET_ACCESS_COUNT 0x2289 189 190 191#define SG_SCATTER_SZ (8 * 4096) 192/* Largest size (in bytes) a single scatter-gather list element can have. 193 The value used by the driver is 'max(SG_SCATTER_SZ, PAGE_SIZE)'. 194 This value should be a power of 2 (and may be rounded up internally). 195 If scatter-gather is not supported by adapter then this value is the 196 largest data block that can be read/written by a single scsi command. */ 197 198#define SG_DEFAULT_RETRIES 0 199 200/* Defaults, commented if they differ from original sg driver */ 201#define SG_DEF_FORCE_PACK_ID 0 202#define SG_DEF_KEEP_ORPHAN 0 203#define SG_DEF_RESERVED_SIZE SG_SCATTER_SZ /* load time option */ 204 205/* maximum outstanding requests, write() yields EDOM if exceeded */ 206#define SG_MAX_QUEUE 16 207 208#define SG_BIG_BUFF SG_DEF_RESERVED_SIZE /* for backward compatibility */ 209 210/* Alternate style type names, "..._t" variants preferred */ 211typedef struct sg_io_hdr Sg_io_hdr; 212typedef struct sg_io_vec Sg_io_vec; 213typedef struct sg_scsi_id Sg_scsi_id; 214typedef struct sg_req_info Sg_req_info; 215 216 217/* vvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvv */ 218/* The older SG interface based on the 'sg_header' structure follows. */ 219/* ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ */ 220 221#define SG_MAX_SENSE 16 /* this only applies to the sg_header interface */ 222 223struct sg_header 224{ 225 int pack_len; /* [o] reply_len (ie useless), ignored as input */ 226 int reply_len; /* [i] max length of expected reply (inc. sg_header) */ 227 int pack_id; /* [io] id number of packet (use ints >= 0) */ 228 int result; /* [o] 0==ok, else (+ve) Unix errno (best ignored) */ 229 unsigned int twelve_byte:1; 230 /* [i] Force 12 byte command length for group 6 & 7 commands */ 231 unsigned int target_status:5; /* [o] scsi status from target */ 232 unsigned int host_status:8; /* [o] host status (see "DID" codes) */ 233 unsigned int driver_status:8; /* [o] driver status+suggestion */ 234 unsigned int other_flags:10; /* unused */ 235 unsigned char sense_buffer[SG_MAX_SENSE]; /* [o] Output in 3 cases: 236 when target_status is CHECK_CONDITION or 237 when target_status is COMMAND_TERMINATED or 238 when (driver_status & DRIVER_SENSE) is true. */ 239}; /* This structure is 36 bytes long on i386 */ 240 241 242/* IOCTLs: The following are not required (or ignored) when the sg_io_hdr_t 243 interface is used. They are kept for backward compatibility with 244 the original and version 2 drivers. */ 245 246#define SG_SET_TIMEOUT 0x2201 /* unit: jiffies (10ms on i386) */ 247#define SG_GET_TIMEOUT 0x2202 /* yield timeout as _return_ value */ 248 249/* Get/set command queuing state per fd (default is SG_DEF_COMMAND_Q. 250 Each time a sg_io_hdr_t object is seen on this file descriptor, this 251 command queuing flag is set on (overriding the previous setting). */ 252#define SG_GET_COMMAND_Q 0x2270 /* Yields 0 (queuing off) or 1 (on) */ 253#define SG_SET_COMMAND_Q 0x2271 /* Change queuing state with 0 or 1 */ 254 255/* Turn on/off error sense trace (1 and 0 respectively, default is off). 256 Try using: "# cat /proc/scsi/sg/debug" instead in the v3 driver */ 257#define SG_SET_DEBUG 0x227e /* 0 -> turn off debug */ 258 259#define SG_NEXT_CMD_LEN 0x2283 /* override SCSI command length with given 260 number on the next write() on this file descriptor */ 261 262 263/* Defaults, commented if they differ from original sg driver */ 264#ifdef __KERNEL__ 265#define SG_DEFAULT_TIMEOUT_USER (60*USER_HZ) /* HZ == 'jiffies in 1 second' */ 266#else 267#define SG_DEFAULT_TIMEOUT (60*HZ) /* HZ == 'jiffies in 1 second' */ 268#endif 269 270#define SG_DEF_COMMAND_Q 0 /* command queuing is always on when 271 the new interface is used */ 272#define SG_DEF_UNDERRUN_FLAG 0 273 274#endif 275