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__ 33 extern int sg_big_buff; /* for sysctl */ 34 #endif 35 36 37 typedef 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 44 typedef 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 74 struct 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 typedef struct sg_scsi_id { /* used by SG_GET_SCSI_ID ioctl() */ 136 int host_no; /* as in "scsi<n>" where 'n' is one of 0, 1, 2 etc */ 137 int channel; 138 int scsi_id; /* scsi id of target device */ 139 int lun; 140 int scsi_type; /* TYPE_... defined in scsi/scsi.h */ 141 short h_cmd_per_lun;/* host (adapter) maximum commands per lun */ 142 short d_queue_depth;/* device (or adapter) maximum queue length */ 143 int unused[2]; /* probably find a good use, set 0 for now */ 144 } sg_scsi_id_t; /* 32 bytes long on i386 */ 145 146 typedef struct sg_req_info { /* used by SG_GET_REQUEST_TABLE ioctl() */ 147 char req_state; /* 0 -> not used, 1 -> written, 2 -> ready to read */ 148 char orphan; /* 0 -> normal request, 1 -> from interruped SG_IO */ 149 char sg_io_owned; /* 0 -> complete with read(), 1 -> owned by SG_IO */ 150 char problem; /* 0 -> no problem detected, 1 -> error to report */ 151 int pack_id; /* pack_id associated with request */ 152 void __user *usr_ptr; /* user provided pointer (in new interface) */ 153 unsigned int duration; /* millisecs elapsed since written (req_state==1) 154 or request duration (req_state==2) */ 155 int unused; 156 } sg_req_info_t; /* 20 bytes long on i386 */ 157 158 159 /* IOCTLs: Those ioctls that are relevant to the SG 3.x drivers follow. 160 [Those that only apply to the SG 2.x drivers are at the end of the file.] 161 (_GET_s yield result via 'int *' 3rd argument unless otherwise indicated) */ 162 163 #define SG_EMULATED_HOST 0x2203 /* true for emulated host adapter (ATAPI) */ 164 165 /* Used to configure SCSI command transformation layer for ATAPI devices */ 166 /* Only supported by the ide-scsi driver */ 167 #define SG_SET_TRANSFORM 0x2204 /* N.B. 3rd arg is not pointer but value: */ 168 /* 3rd arg = 0 to disable transform, 1 to enable it */ 169 #define SG_GET_TRANSFORM 0x2205 170 171 #define SG_SET_RESERVED_SIZE 0x2275 /* request a new reserved buffer size */ 172 #define SG_GET_RESERVED_SIZE 0x2272 /* actual size of reserved buffer */ 173 174 /* The following ioctl has a 'sg_scsi_id_t *' object as its 3rd argument. */ 175 #define SG_GET_SCSI_ID 0x2276 /* Yields fd's bus, chan, dev, lun + type */ 176 /* SCSI id information can also be obtained from SCSI_IOCTL_GET_IDLUN */ 177 178 /* Override host setting and always DMA using low memory ( <16MB on i386) */ 179 #define SG_SET_FORCE_LOW_DMA 0x2279 /* 0-> use adapter setting, 1-> force */ 180 #define SG_GET_LOW_DMA 0x227a /* 0-> use all ram for dma; 1-> low dma ram */ 181 182 /* When SG_SET_FORCE_PACK_ID set to 1, pack_id is input to read() which 183 tries to fetch a packet with a matching pack_id, waits, or returns EAGAIN. 184 If pack_id is -1 then read oldest waiting. When ...FORCE_PACK_ID set to 0 185 then pack_id ignored by read() and oldest readable fetched. */ 186 #define SG_SET_FORCE_PACK_ID 0x227b 187 #define SG_GET_PACK_ID 0x227c /* Yields oldest readable pack_id (or -1) */ 188 189 #define SG_GET_NUM_WAITING 0x227d /* Number of commands awaiting read() */ 190 191 /* Yields max scatter gather tablesize allowed by current host adapter */ 192 #define SG_GET_SG_TABLESIZE 0x227F /* 0 implies can't do scatter gather */ 193 194 #define SG_GET_VERSION_NUM 0x2282 /* Example: version 2.1.34 yields 20134 */ 195 196 /* Returns -EBUSY if occupied. 3rd argument pointer to int (see next) */ 197 #define SG_SCSI_RESET 0x2284 198 /* Associated values that can be given to SG_SCSI_RESET follow. 199 * SG_SCSI_RESET_NO_ESCALATE may be OR-ed to the _DEVICE, _TARGET, _BUS 200 * or _HOST reset value so only that action is attempted. */ 201 #define SG_SCSI_RESET_NOTHING 0 202 #define SG_SCSI_RESET_DEVICE 1 203 #define SG_SCSI_RESET_BUS 2 204 #define SG_SCSI_RESET_HOST 3 205 #define SG_SCSI_RESET_TARGET 4 206 #define SG_SCSI_RESET_NO_ESCALATE 0x100 207 208 /* synchronous SCSI command ioctl, (only in version 3 interface) */ 209 #define SG_IO 0x2285 /* similar effect as write() followed by read() */ 210 211 #define SG_GET_REQUEST_TABLE 0x2286 /* yields table of active requests */ 212 213 /* How to treat EINTR during SG_IO ioctl(), only in SG 3.x series */ 214 #define SG_SET_KEEP_ORPHAN 0x2287 /* 1 -> hold for read(), 0 -> drop (def) */ 215 #define SG_GET_KEEP_ORPHAN 0x2288 216 217 /* yields scsi midlevel's access_count for this SCSI device */ 218 #define SG_GET_ACCESS_COUNT 0x2289 219 220 221 #define SG_SCATTER_SZ (8 * 4096) 222 /* Largest size (in bytes) a single scatter-gather list element can have. 223 The value used by the driver is 'max(SG_SCATTER_SZ, PAGE_SIZE)'. 224 This value should be a power of 2 (and may be rounded up internally). 225 If scatter-gather is not supported by adapter then this value is the 226 largest data block that can be read/written by a single scsi command. */ 227 228 #define SG_DEFAULT_RETRIES 0 229 230 /* Defaults, commented if they differ from original sg driver */ 231 #define SG_DEF_FORCE_PACK_ID 0 232 #define SG_DEF_KEEP_ORPHAN 0 233 #define SG_DEF_RESERVED_SIZE SG_SCATTER_SZ /* load time option */ 234 235 /* maximum outstanding requests, write() yields EDOM if exceeded */ 236 #define SG_MAX_QUEUE 16 237 238 #define SG_BIG_BUFF SG_DEF_RESERVED_SIZE /* for backward compatibility */ 239 240 /* Alternate style type names, "..._t" variants preferred */ 241 typedef struct sg_io_hdr Sg_io_hdr; 242 typedef struct sg_io_vec Sg_io_vec; 243 typedef struct sg_scsi_id Sg_scsi_id; 244 typedef struct sg_req_info Sg_req_info; 245 246 247 /* vvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvv */ 248 /* The older SG interface based on the 'sg_header' structure follows. */ 249 /* ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ */ 250 251 #define SG_MAX_SENSE 16 /* this only applies to the sg_header interface */ 252 253 struct sg_header 254 { 255 int pack_len; /* [o] reply_len (ie useless), ignored as input */ 256 int reply_len; /* [i] max length of expected reply (inc. sg_header) */ 257 int pack_id; /* [io] id number of packet (use ints >= 0) */ 258 int result; /* [o] 0==ok, else (+ve) Unix errno (best ignored) */ 259 unsigned int twelve_byte:1; 260 /* [i] Force 12 byte command length for group 6 & 7 commands */ 261 unsigned int target_status:5; /* [o] scsi status from target */ 262 unsigned int host_status:8; /* [o] host status (see "DID" codes) */ 263 unsigned int driver_status:8; /* [o] driver status+suggestion */ 264 unsigned int other_flags:10; /* unused */ 265 unsigned char sense_buffer[SG_MAX_SENSE]; /* [o] Output in 3 cases: 266 when target_status is CHECK_CONDITION or 267 when target_status is COMMAND_TERMINATED or 268 when (driver_status & DRIVER_SENSE) is true. */ 269 }; /* This structure is 36 bytes long on i386 */ 270 271 272 /* IOCTLs: The following are not required (or ignored) when the sg_io_hdr_t 273 interface is used. They are kept for backward compatibility with 274 the original and version 2 drivers. */ 275 276 #define SG_SET_TIMEOUT 0x2201 /* unit: jiffies (10ms on i386) */ 277 #define SG_GET_TIMEOUT 0x2202 /* yield timeout as _return_ value */ 278 279 /* Get/set command queuing state per fd (default is SG_DEF_COMMAND_Q. 280 Each time a sg_io_hdr_t object is seen on this file descriptor, this 281 command queuing flag is set on (overriding the previous setting). */ 282 #define SG_GET_COMMAND_Q 0x2270 /* Yields 0 (queuing off) or 1 (on) */ 283 #define SG_SET_COMMAND_Q 0x2271 /* Change queuing state with 0 or 1 */ 284 285 /* Turn on/off error sense trace (1 and 0 respectively, default is off). 286 Try using: "# cat /proc/scsi/sg/debug" instead in the v3 driver */ 287 #define SG_SET_DEBUG 0x227e /* 0 -> turn off debug */ 288 289 #define SG_NEXT_CMD_LEN 0x2283 /* override SCSI command length with given 290 number on the next write() on this file descriptor */ 291 292 293 /* Defaults, commented if they differ from original sg driver */ 294 #ifdef __KERNEL__ 295 #define SG_DEFAULT_TIMEOUT_USER (60*USER_HZ) /* HZ == 'jiffies in 1 second' */ 296 #else 297 #define SG_DEFAULT_TIMEOUT (60*HZ) /* HZ == 'jiffies in 1 second' */ 298 #endif 299 300 #define SG_DEF_COMMAND_Q 0 /* command queuing is always on when 301 the new interface is used */ 302 #define SG_DEF_UNDERRUN_FLAG 0 303 304 #endif 305
