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Linus Torvalds1da177e2005-04-16 15:20:36 -07001#ifndef _SCSI_GENERIC_H
2#define _SCSI_GENERIC_H
3
4#include <linux/compiler.h>
5
6/*
Douglas Gilbertad6d7152014-06-03 13:18:18 -04007 * History:
8 * Started: Aug 9 by Lawrence Foard (entropy@world.std.com), to allow user
9 * process control of SCSI devices.
10 * Development Sponsored by Killy Corp. NY NY
11 *
12 * Original driver (sg.h):
13 * Copyright (C) 1992 Lawrence Foard
14 * Version 2 and 3 extensions to driver:
15 * Copyright (C) 1998 - 2014 Douglas Gilbert
16 *
17 * Version: 3.5.36 (20140603)
18 * This version is for 2.6 and 3 series kernels.
19 *
20 * Documentation
21 * =============
22 * A web site for the SG device driver can be found at:
23 * http://sg.danny.cz/sg [alternatively check the MAINTAINERS file]
24 * The documentation for the sg version 3 driver can be found at:
25 * http://sg.danny.cz/sg/p/sg_v3_ho.html
26 * Also see: <kernel_source>/Documentation/scsi/scsi-generic.txt
27 *
28 * For utility and test programs see: http://sg.danny.cz/sg/sg3_utils.html
29 */
Linus Torvalds1da177e2005-04-16 15:20:36 -070030
Dave Young15485a42010-03-10 15:24:07 -080031#ifdef __KERNEL__
32extern int sg_big_buff; /* for sysctl */
33#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -070034
Linus Torvalds1da177e2005-04-16 15:20:36 -070035
36typedef struct sg_iovec /* same structure as used by readv() Linux system */
37{ /* call. It defines one scatter-gather element. */
38 void __user *iov_base; /* Starting address */
39 size_t iov_len; /* Length in bytes */
40} sg_iovec_t;
41
42
43typedef struct sg_io_hdr
44{
45 int interface_id; /* [i] 'S' for SCSI generic (required) */
46 int dxfer_direction; /* [i] data transfer direction */
Douglas Gilbertad6d7152014-06-03 13:18:18 -040047 unsigned char cmd_len; /* [i] SCSI command length */
Linus Torvalds1da177e2005-04-16 15:20:36 -070048 unsigned char mx_sb_len; /* [i] max length to write to sbp */
49 unsigned short iovec_count; /* [i] 0 implies no scatter gather */
50 unsigned int dxfer_len; /* [i] byte count of data transfer */
51 void __user *dxferp; /* [i], [*io] points to data transfer memory
52 or scatter gather list */
53 unsigned char __user *cmdp; /* [i], [*i] points to command to perform */
54 void __user *sbp; /* [i], [*o] points to sense_buffer memory */
55 unsigned int timeout; /* [i] MAX_UINT->no timeout (unit: millisec) */
56 unsigned int flags; /* [i] 0 -> default, see SG_FLAG... */
57 int pack_id; /* [i->o] unused internally (normally) */
58 void __user * usr_ptr; /* [i->o] unused internally */
59 unsigned char status; /* [o] scsi status */
60 unsigned char masked_status;/* [o] shifted, masked scsi status */
61 unsigned char msg_status; /* [o] messaging level data (optional) */
62 unsigned char sb_len_wr; /* [o] byte count actually written to sbp */
63 unsigned short host_status; /* [o] errors from host adapter */
64 unsigned short driver_status;/* [o] errors from software driver */
65 int resid; /* [o] dxfer_len - actual_transferred */
66 unsigned int duration; /* [o] time taken by cmd (unit: millisec) */
67 unsigned int info; /* [o] auxiliary information */
68} sg_io_hdr_t; /* 64 bytes long (on i386) */
69
70#define SG_INTERFACE_ID_ORIG 'S'
71
72/* Use negative values to flag difference from original sg_header structure */
73#define SG_DXFER_NONE (-1) /* e.g. a SCSI Test Unit Ready command */
74#define SG_DXFER_TO_DEV (-2) /* e.g. a SCSI WRITE command */
75#define SG_DXFER_FROM_DEV (-3) /* e.g. a SCSI READ command */
76#define SG_DXFER_TO_FROM_DEV (-4) /* treated like SG_DXFER_FROM_DEV with the
77 additional property than during indirect
78 IO the user buffer is copied into the
79 kernel buffers before the transfer */
80#define SG_DXFER_UNKNOWN (-5) /* Unknown data direction */
81
82/* following flag values can be "or"-ed together */
83#define SG_FLAG_DIRECT_IO 1 /* default is indirect IO */
84#define SG_FLAG_UNUSED_LUN_INHIBIT 2 /* default is overwrite lun in SCSI */
85 /* command block (when <= SCSI_2) */
86#define SG_FLAG_MMAP_IO 4 /* request memory mapped IO */
87#define SG_FLAG_NO_DXFER 0x10000 /* no transfer of kernel buffers to/from */
88 /* user space (debug indirect IO) */
89
90/* following 'info' values are "or"-ed together */
91#define SG_INFO_OK_MASK 0x1
92#define SG_INFO_OK 0x0 /* no sense, host nor driver "noise" */
93#define SG_INFO_CHECK 0x1 /* something abnormal happened */
94
95#define SG_INFO_DIRECT_IO_MASK 0x6
96#define SG_INFO_INDIRECT_IO 0x0 /* data xfer via kernel buffers (or no xfer) */
97#define SG_INFO_DIRECT_IO 0x2 /* direct IO requested and performed */
98#define SG_INFO_MIXED_IO 0x4 /* part direct, part indirect IO */
99
100
101typedef struct sg_scsi_id { /* used by SG_GET_SCSI_ID ioctl() */
102 int host_no; /* as in "scsi<n>" where 'n' is one of 0, 1, 2 etc */
103 int channel;
104 int scsi_id; /* scsi id of target device */
105 int lun;
106 int scsi_type; /* TYPE_... defined in scsi/scsi.h */
107 short h_cmd_per_lun;/* host (adapter) maximum commands per lun */
108 short d_queue_depth;/* device (or adapter) maximum queue length */
109 int unused[2]; /* probably find a good use, set 0 for now */
110} sg_scsi_id_t; /* 32 bytes long on i386 */
111
112typedef struct sg_req_info { /* used by SG_GET_REQUEST_TABLE ioctl() */
113 char req_state; /* 0 -> not used, 1 -> written, 2 -> ready to read */
114 char orphan; /* 0 -> normal request, 1 -> from interruped SG_IO */
115 char sg_io_owned; /* 0 -> complete with read(), 1 -> owned by SG_IO */
116 char problem; /* 0 -> no problem detected, 1 -> error to report */
117 int pack_id; /* pack_id associated with request */
118 void __user *usr_ptr; /* user provided pointer (in new interface) */
119 unsigned int duration; /* millisecs elapsed since written (req_state==1)
120 or request duration (req_state==2) */
121 int unused;
122} sg_req_info_t; /* 20 bytes long on i386 */
123
124
125/* IOCTLs: Those ioctls that are relevant to the SG 3.x drivers follow.
126 [Those that only apply to the SG 2.x drivers are at the end of the file.]
127 (_GET_s yield result via 'int *' 3rd argument unless otherwise indicated) */
128
129#define SG_EMULATED_HOST 0x2203 /* true for emulated host adapter (ATAPI) */
130
131/* Used to configure SCSI command transformation layer for ATAPI devices */
132/* Only supported by the ide-scsi driver */
133#define SG_SET_TRANSFORM 0x2204 /* N.B. 3rd arg is not pointer but value: */
134 /* 3rd arg = 0 to disable transform, 1 to enable it */
135#define SG_GET_TRANSFORM 0x2205
136
137#define SG_SET_RESERVED_SIZE 0x2275 /* request a new reserved buffer size */
138#define SG_GET_RESERVED_SIZE 0x2272 /* actual size of reserved buffer */
139
140/* The following ioctl has a 'sg_scsi_id_t *' object as its 3rd argument. */
141#define SG_GET_SCSI_ID 0x2276 /* Yields fd's bus, chan, dev, lun + type */
142/* SCSI id information can also be obtained from SCSI_IOCTL_GET_IDLUN */
143
144/* Override host setting and always DMA using low memory ( <16MB on i386) */
145#define SG_SET_FORCE_LOW_DMA 0x2279 /* 0-> use adapter setting, 1-> force */
146#define SG_GET_LOW_DMA 0x227a /* 0-> use all ram for dma; 1-> low dma ram */
147
148/* When SG_SET_FORCE_PACK_ID set to 1, pack_id is input to read() which
149 tries to fetch a packet with a matching pack_id, waits, or returns EAGAIN.
150 If pack_id is -1 then read oldest waiting. When ...FORCE_PACK_ID set to 0
151 then pack_id ignored by read() and oldest readable fetched. */
152#define SG_SET_FORCE_PACK_ID 0x227b
153#define SG_GET_PACK_ID 0x227c /* Yields oldest readable pack_id (or -1) */
154
155#define SG_GET_NUM_WAITING 0x227d /* Number of commands awaiting read() */
156
157/* Yields max scatter gather tablesize allowed by current host adapter */
158#define SG_GET_SG_TABLESIZE 0x227F /* 0 implies can't do scatter gather */
159
160#define SG_GET_VERSION_NUM 0x2282 /* Example: version 2.1.34 yields 20134 */
161
162/* Returns -EBUSY if occupied. 3rd argument pointer to int (see next) */
163#define SG_SCSI_RESET 0x2284
164/* Associated values that can be given to SG_SCSI_RESET follow */
165#define SG_SCSI_RESET_NOTHING 0
166#define SG_SCSI_RESET_DEVICE 1
167#define SG_SCSI_RESET_BUS 2
168#define SG_SCSI_RESET_HOST 3
Brian King39120e12008-07-01 13:03:19 -0500169#define SG_SCSI_RESET_TARGET 4
Linus Torvalds1da177e2005-04-16 15:20:36 -0700170
171/* synchronous SCSI command ioctl, (only in version 3 interface) */
172#define SG_IO 0x2285 /* similar effect as write() followed by read() */
173
174#define SG_GET_REQUEST_TABLE 0x2286 /* yields table of active requests */
175
176/* How to treat EINTR during SG_IO ioctl(), only in SG 3.x series */
177#define SG_SET_KEEP_ORPHAN 0x2287 /* 1 -> hold for read(), 0 -> drop (def) */
178#define SG_GET_KEEP_ORPHAN 0x2288
179
180/* yields scsi midlevel's access_count for this SCSI device */
181#define SG_GET_ACCESS_COUNT 0x2289
182
183
Douglas Gilbert6460e752006-09-20 18:20:49 -0400184#define SG_SCATTER_SZ (8 * 4096)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700185/* Largest size (in bytes) a single scatter-gather list element can have.
Douglas Gilbert6460e752006-09-20 18:20:49 -0400186 The value used by the driver is 'max(SG_SCATTER_SZ, PAGE_SIZE)'.
187 This value should be a power of 2 (and may be rounded up internally).
188 If scatter-gather is not supported by adapter then this value is the
189 largest data block that can be read/written by a single scsi command. */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700190
191#define SG_DEFAULT_RETRIES 0
192
193/* Defaults, commented if they differ from original sg driver */
194#define SG_DEF_FORCE_LOW_DMA 0 /* was 1 -> memory below 16MB on i386 */
195#define SG_DEF_FORCE_PACK_ID 0
196#define SG_DEF_KEEP_ORPHAN 0
197#define SG_DEF_RESERVED_SIZE SG_SCATTER_SZ /* load time option */
198
199/* maximum outstanding requests, write() yields EDOM if exceeded */
200#define SG_MAX_QUEUE 16
201
202#define SG_BIG_BUFF SG_DEF_RESERVED_SIZE /* for backward compatibility */
203
204/* Alternate style type names, "..._t" variants preferred */
205typedef struct sg_io_hdr Sg_io_hdr;
206typedef struct sg_io_vec Sg_io_vec;
207typedef struct sg_scsi_id Sg_scsi_id;
208typedef struct sg_req_info Sg_req_info;
209
210
211/* vvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvv */
212/* The older SG interface based on the 'sg_header' structure follows. */
213/* ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ */
214
215#define SG_MAX_SENSE 16 /* this only applies to the sg_header interface */
216
217struct sg_header
218{
219 int pack_len; /* [o] reply_len (ie useless), ignored as input */
220 int reply_len; /* [i] max length of expected reply (inc. sg_header) */
221 int pack_id; /* [io] id number of packet (use ints >= 0) */
222 int result; /* [o] 0==ok, else (+ve) Unix errno (best ignored) */
223 unsigned int twelve_byte:1;
224 /* [i] Force 12 byte command length for group 6 & 7 commands */
225 unsigned int target_status:5; /* [o] scsi status from target */
226 unsigned int host_status:8; /* [o] host status (see "DID" codes) */
227 unsigned int driver_status:8; /* [o] driver status+suggestion */
228 unsigned int other_flags:10; /* unused */
229 unsigned char sense_buffer[SG_MAX_SENSE]; /* [o] Output in 3 cases:
230 when target_status is CHECK_CONDITION or
231 when target_status is COMMAND_TERMINATED or
232 when (driver_status & DRIVER_SENSE) is true. */
233}; /* This structure is 36 bytes long on i386 */
234
235
236/* IOCTLs: The following are not required (or ignored) when the sg_io_hdr_t
237 interface is used. They are kept for backward compatibility with
238 the original and version 2 drivers. */
239
240#define SG_SET_TIMEOUT 0x2201 /* unit: jiffies (10ms on i386) */
241#define SG_GET_TIMEOUT 0x2202 /* yield timeout as _return_ value */
242
243/* Get/set command queuing state per fd (default is SG_DEF_COMMAND_Q.
244 Each time a sg_io_hdr_t object is seen on this file descriptor, this
245 command queuing flag is set on (overriding the previous setting). */
246#define SG_GET_COMMAND_Q 0x2270 /* Yields 0 (queuing off) or 1 (on) */
247#define SG_SET_COMMAND_Q 0x2271 /* Change queuing state with 0 or 1 */
248
249/* Turn on/off error sense trace (1 and 0 respectively, default is off).
250 Try using: "# cat /proc/scsi/sg/debug" instead in the v3 driver */
251#define SG_SET_DEBUG 0x227e /* 0 -> turn off debug */
252
253#define SG_NEXT_CMD_LEN 0x2283 /* override SCSI command length with given
254 number on the next write() on this file descriptor */
255
256
257/* Defaults, commented if they differ from original sg driver */
258#ifdef __KERNEL__
259#define SG_DEFAULT_TIMEOUT_USER (60*USER_HZ) /* HZ == 'jiffies in 1 second' */
260#else
261#define SG_DEFAULT_TIMEOUT (60*HZ) /* HZ == 'jiffies in 1 second' */
262#endif
263
264#define SG_DEF_COMMAND_Q 0 /* command queuing is always on when
265 the new interface is used */
266#define SG_DEF_UNDERRUN_FLAG 0
267
268#endif