summaryrefslogtreecommitdiffstats
path: root/include/scsi/scsi.h
blob: 96b3503666703dd050a1c4c4a528c2a84f9c0e1b (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
/* SPDX-License-Identifier: GPL-2.0 */
/*
 * This header file contains public constants and structures used by
 * the SCSI initiator code.
 */
#ifndef _SCSI_SCSI_H
#define _SCSI_SCSI_H

#include <linux/types.h>

#include <asm/param.h>

#include <scsi/scsi_common.h>
#include <scsi/scsi_proto.h>
#include <scsi/scsi_status.h>

struct scsi_cmnd;

enum scsi_timeouts {
	SCSI_DEFAULT_EH_TIMEOUT		= 10 * HZ,
};

/*
 * DIX-capable adapters effectively support infinite chaining for the
 * protection information scatterlist
 */
#define SCSI_MAX_PROT_SG_SEGMENTS	0xFFFF

/*
 * Special value for scanning to specify scanning or rescanning of all
 * possible channels, (target) ids, or luns on a given shost.
 */
#define SCAN_WILD_CARD	~0

/*
 * standard mode-select header prepended to all mode-select commands
 */

struct ccs_modesel_head {
	__u8 _r1;			/* reserved */
	__u8 medium;		/* device-specific medium type */
	__u8 _r2;			/* reserved */
	__u8 block_desc_length;	/* block descriptor length */
	__u8 density;		/* device-specific density code */
	__u8 number_blocks_hi;	/* number of blocks in this block desc */
	__u8 number_blocks_med;
	__u8 number_blocks_lo;
	__u8 _r3;
	__u8 block_length_hi;	/* block length for blocks in this desc */
	__u8 block_length_med;
	__u8 block_length_lo;
};

/*
 * The Well Known LUNS (SAM-3) in our int representation of a LUN
 */
#define SCSI_W_LUN_BASE 0xc100
#define SCSI_W_LUN_REPORT_LUNS (SCSI_W_LUN_BASE + 1)
#define SCSI_W_LUN_ACCESS_CONTROL (SCSI_W_LUN_BASE + 2)
#define SCSI_W_LUN_TARGET_LOG_PAGE (SCSI_W_LUN_BASE + 3)

static inline int scsi_is_wlun(u64 lun)
{
	return (lun & 0xff00) == SCSI_W_LUN_BASE;
}

/**
 * scsi_status_is_check_condition - check the status return.
 *
 * @status: the status passed up from the driver (including host and
 *          driver components)
 *
 * Returns: %true if the status code is SAM_STAT_CHECK_CONDITION.
 */
static inline int scsi_status_is_check_condition(int status)
{
	if (status < 0)
		return false;
	status &= 0xfe;
	return status == SAM_STAT_CHECK_CONDITION;
}

/*
 *  Extended message codes.
 */
#define     EXTENDED_MODIFY_DATA_POINTER    0x00
#define     EXTENDED_SDTR                   0x01
#define     EXTENDED_EXTENDED_IDENTIFY      0x02    /* SCSI-I only */
#define     EXTENDED_WDTR                   0x03
#define     EXTENDED_PPR                    0x04
#define     EXTENDED_MODIFY_BIDI_DATA_PTR   0x05

/*
 * Internal return values.
 */
enum scsi_disposition {
	NEEDS_RETRY		= 0x2001,
	SUCCESS			= 0x2002,
	FAILED			= 0x2003,
	QUEUED			= 0x2004,
	SOFT_ERROR		= 0x2005,
	ADD_TO_MLQUEUE		= 0x2006,
	TIMEOUT_ERROR		= 0x2007,
	SCSI_RETURN_NOT_HANDLED	= 0x2008,
	FAST_IO_FAIL		= 0x2009,
};

/*
 * Midlevel queue return values.
 */
#define SCSI_MLQUEUE_HOST_BUSY   0x1055
#define SCSI_MLQUEUE_DEVICE_BUSY 0x1056
#define SCSI_MLQUEUE_EH_RETRY    0x1057
#define SCSI_MLQUEUE_TARGET_BUSY 0x1058

/*
 *  Use these to separate status msg and our bytes
 *
 *  These are set by:
 *
 *      status byte = set from target device
 *      msg_byte    (unused)
 *      host_byte   = set by low-level driver to indicate status.
 */
#define status_byte(result) (result & 0xff)
#define host_byte(result)   (((result) >> 16) & 0xff)

#define sense_class(sense)  (((sense) >> 4) & 0x7)
#define sense_error(sense)  ((sense) & 0xf)
#define sense_valid(sense)  ((sense) & 0x80)

/*
 * default timeouts
*/
#define FORMAT_UNIT_TIMEOUT		(2 * 60 * 60 * HZ)
#define START_STOP_TIMEOUT		(60 * HZ)
#define MOVE_MEDIUM_TIMEOUT		(5 * 60 * HZ)
#define READ_ELEMENT_STATUS_TIMEOUT	(5 * 60 * HZ)
#define READ_DEFECT_DATA_TIMEOUT	(60 * HZ )


#define IDENTIFY_BASE       0x80
#define IDENTIFY(can_disconnect, lun)   (IDENTIFY_BASE |\
		     ((can_disconnect) ?  0x40 : 0) |\
		     ((lun) & 0x07))

/*
 *  struct scsi_device::scsi_level values. For SCSI devices other than those
 *  prior to SCSI-2 (i.e. over 12 years old) this value is (resp[2] + 1)
 *  where "resp" is a byte array of the response to an INQUIRY. The scsi_level
 *  variable is visible to the user via sysfs.
 */

#define SCSI_UNKNOWN    0
#define SCSI_1          1
#define SCSI_1_CCS      2
#define SCSI_2          3
#define SCSI_3          4        /* SPC */
#define SCSI_SPC_2      5
#define SCSI_SPC_3      6
#define SCSI_SPC_4	7
#define SCSI_SPC_5	8
#define SCSI_SPC_6	14

/*
 * INQ PERIPHERAL QUALIFIERS
 */
#define SCSI_INQ_PQ_CON         0x00
#define SCSI_INQ_PQ_NOT_CON     0x01
#define SCSI_INQ_PQ_NOT_CAP     0x03


/*
 * Here are some scsi specific ioctl commands which are sometimes useful.
 *
 * Note that include/linux/cdrom.h also defines IOCTL 0x5300 - 0x5395
 */

/* Used to obtain PUN and LUN info.  Conflicts with CDROMAUDIOBUFSIZ */
#define SCSI_IOCTL_GET_IDLUN		0x5382

/* 0x5383 and 0x5384 were used for SCSI_IOCTL_TAGGED_{ENABLE,DISABLE} */

/* Used to obtain the host number of a device. */
#define SCSI_IOCTL_PROBE_HOST		0x5385

/* Used to obtain the bus number for a device */
#define SCSI_IOCTL_GET_BUS_NUMBER	0x5386

/* Used to obtain the PCI location of a device */
#define SCSI_IOCTL_GET_PCI		0x5387

/**
 * scsi_status_is_good - check the status return.
 *
 * @status: the status passed up from the driver (including host and
 *          driver components)
 *
 * Returns: %true for known good conditions that may be treated as
 * command completed normally
 */
static inline bool scsi_status_is_good(int status)
{
	if (status < 0)
		return false;

	if (host_byte(status) == DID_NO_CONNECT)
		return false;

	/*
	 * FIXME: bit0 is listed as reserved in SCSI-2, but is
	 * significant in SCSI-3.  For now, we follow the SCSI-2
	 * behaviour and ignore reserved bits.
	 */
	status &= 0xfe;
	return ((status == SAM_STAT_GOOD) ||
		(status == SAM_STAT_CONDITION_MET) ||
		/* Next two "intermediate" statuses are obsolete in SAM-4 */
		(status == SAM_STAT_INTERMEDIATE) ||
		(status == SAM_STAT_INTERMEDIATE_CONDITION_MET) ||
		/* FIXME: this is obsolete in SAM-3 */
		(status == SAM_STAT_COMMAND_TERMINATED));
}

#endif /* _SCSI_SCSI_H */