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__
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 #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
105 typedef 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
116 typedef 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 */
211 typedef struct sg_io_hdr Sg_io_hdr;
212 typedef struct sg_io_vec Sg_io_vec;
213 typedef struct sg_scsi_id Sg_scsi_id;
214 typedef 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
223 struct 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