1 /* SPDX-License-Identifier: GPL-2.0 */
2 /*
3 * This header file contains public constants and structures used by
4 * the SCSI initiator code.
5 */
6 #ifndef _SCSI_SCSI_H
7 #define _SCSI_SCSI_H
8
9 #include <linux/types.h>
10
11 #include <asm/param.h>
12
13 #include <scsi/scsi_common.h>
14 #include <scsi/scsi_proto.h>
15 #include <scsi/scsi_status.h>
16
17 struct scsi_cmnd;
18
19 enum scsi_timeouts {
20 SCSI_DEFAULT_EH_TIMEOUT = 10 * HZ,
21 };
22
23 /*
24 * DIX-capable adapters effectively support infinite chaining for the
25 * protection information scatterlist
26 */
27 #define SCSI_MAX_PROT_SG_SEGMENTS 0xFFFF
28
29 /*
30 * Special value for scanning to specify scanning or rescanning of all
31 * possible channels, (target) ids, or luns on a given shost.
32 */
33 #define SCAN_WILD_CARD ~0
34
35 /*
36 * standard mode-select header prepended to all mode-select commands
37 */
38
39 struct ccs_modesel_head {
40 __u8 _r1; /* reserved */
41 __u8 medium; /* device-specific medium type */
42 __u8 _r2; /* reserved */
43 __u8 block_desc_length; /* block descriptor length */
44 __u8 density; /* device-specific density code */
45 __u8 number_blocks_hi; /* number of blocks in this block desc */
46 __u8 number_blocks_med;
47 __u8 number_blocks_lo;
48 __u8 _r3;
49 __u8 block_length_hi; /* block length for blocks in this desc */
50 __u8 block_length_med;
51 __u8 block_length_lo;
52 };
53
54 /*
55 * The Well Known LUNS (SAM-3) in our int representation of a LUN
56 */
57 #define SCSI_W_LUN_BASE 0xc100
58 #define SCSI_W_LUN_REPORT_LUNS (SCSI_W_LUN_BASE + 1)
59 #define SCSI_W_LUN_ACCESS_CONTROL (SCSI_W_LUN_BASE + 2)
60 #define SCSI_W_LUN_TARGET_LOG_PAGE (SCSI_W_LUN_BASE + 3)
61
62 static inline int scsi_is_wlun(u64 lun)
63 {
64 return (lun & 0xff00) == SCSI_W_LUN_BASE;
65 }
66
67 /**
68 * scsi_status_is_check_condition - check the status return.
69 *
70 * @status: the status passed up from the driver (including host and
71 * driver components)
72 *
73 * Returns: %true if the status code is SAM_STAT_CHECK_CONDITION.
74 */
75 static inline int scsi_status_is_check_condition(int status)
76 {
77 if (status < 0)
78 return false;
79 status &= 0xfe;
80 return status == SAM_STAT_CHECK_CONDITION;
81 }
82
83 /*
84 * Extended message codes.
85 */
86 #define EXTENDED_MODIFY_DATA_POINTER 0x00
87 #define EXTENDED_SDTR 0x01
88 #define EXTENDED_EXTENDED_IDENTIFY 0x02 /* SCSI-I only */
89 #define EXTENDED_WDTR 0x03
90 #define EXTENDED_PPR 0x04
91 #define EXTENDED_MODIFY_BIDI_DATA_PTR 0x05
92
93 /*
94 * Internal return values.
95 */
96 enum scsi_disposition {
97 NEEDS_RETRY = 0x2001,
98 SUCCESS = 0x2002,
99 FAILED = 0x2003,
100 QUEUED = 0x2004,
101 SOFT_ERROR = 0x2005,
102 ADD_TO_MLQUEUE = 0x2006,
103 TIMEOUT_ERROR = 0x2007,
104 SCSI_RETURN_NOT_HANDLED = 0x2008,
105 FAST_IO_FAIL = 0x2009,
106 };
107
108 /*
109 * Midlevel queue return values.
110 */
111 #define SCSI_MLQUEUE_HOST_BUSY 0x1055
112 #define SCSI_MLQUEUE_DEVICE_BUSY 0x1056
113 #define SCSI_MLQUEUE_EH_RETRY 0x1057
114 #define SCSI_MLQUEUE_TARGET_BUSY 0x1058
115
116 /*
117 * Use these to separate status msg and our bytes
118 *
119 * These are set by:
120 *
121 * status byte = set from target device
122 * msg_byte (unused)
123 * host_byte = set by low-level driver to indicate status.
124 */
125 #define status_byte(result) (result & 0xff)
126 #define host_byte(result) (((result) >> 16) & 0xff)
127
128 #define sense_class(sense) (((sense) >> 4) & 0x7)
129 #define sense_error(sense) ((sense) & 0xf)
130 #define sense_valid(sense) ((sense) & 0x80)
131
132 /*
133 * default timeouts
134 */
135 #define FORMAT_UNIT_TIMEOUT (2 * 60 * 60 * HZ)
136 #define START_STOP_TIMEOUT (60 * HZ)
137 #define MOVE_MEDIUM_TIMEOUT (5 * 60 * HZ)
138 #define READ_ELEMENT_STATUS_TIMEOUT (5 * 60 * HZ)
139 #define READ_DEFECT_DATA_TIMEOUT (60 * HZ )
140
141
142 #define IDENTIFY_BASE 0x80
143 #define IDENTIFY(can_disconnect, lun) (IDENTIFY_BASE |\
144 ((can_disconnect) ? 0x40 : 0) |\
145 ((lun) & 0x07))
146
147 /*
148 * struct scsi_device::scsi_level values. For SCSI devices other than those
149 * prior to SCSI-2 (i.e. over 12 years old) this value is (resp[2] + 1)
150 * where "resp" is a byte array of the response to an INQUIRY. The scsi_level
151 * variable is visible to the user via sysfs.
152 */
153
154 #define SCSI_UNKNOWN 0
155 #define SCSI_1 1
156 #define SCSI_1_CCS 2
157 #define SCSI_2 3
158 #define SCSI_3 4 /* SPC */
159 #define SCSI_SPC_2 5
160 #define SCSI_SPC_3 6
161 #define SCSI_SPC_4 7
162 #define SCSI_SPC_5 8
163 #define SCSI_SPC_6 14
164
165 /*
166 * INQ PERIPHERAL QUALIFIERS
167 */
168 #define SCSI_INQ_PQ_CON 0x00
169 #define SCSI_INQ_PQ_NOT_CON 0x01
170 #define SCSI_INQ_PQ_NOT_CAP 0x03
171
172
173 /*
174 * Here are some scsi specific ioctl commands which are sometimes useful.
175 *
176 * Note that include/linux/cdrom.h also defines IOCTL 0x5300 - 0x5395
177 */
178
179 /* Used to obtain PUN and LUN info. Conflicts with CDROMAUDIOBUFSIZ */
180 #define SCSI_IOCTL_GET_IDLUN 0x5382
181
182 /* 0x5383 and 0x5384 were used for SCSI_IOCTL_TAGGED_{ENABLE,DISABLE} */
183
184 /* Used to obtain the host number of a device. */
185 #define SCSI_IOCTL_PROBE_HOST 0x5385
186
187 /* Used to obtain the bus number for a device */
188 #define SCSI_IOCTL_GET_BUS_NUMBER 0x5386
189
190 /* Used to obtain the PCI location of a device */
191 #define SCSI_IOCTL_GET_PCI 0x5387
192
193 /**
194 * scsi_status_is_good - check the status return.
195 *
196 * @status: the status passed up from the driver (including host and
197 * driver components)
198 *
199 * Returns: %true for known good conditions that may be treated as
200 * command completed normally
201 */
202 static inline bool scsi_status_is_good(int status)
203 {
204 if (status < 0)
205 return false;
206
207 if (host_byte(status) == DID_NO_CONNECT)
208 return false;
209
210 /*
211 * FIXME: bit0 is listed as reserved in SCSI-2, but is
212 * significant in SCSI-3. For now, we follow the SCSI-2
213 * behaviour and ignore reserved bits.
214 */
215 status &= 0xfe;
216 return ((status == SAM_STAT_GOOD) ||
217 (status == SAM_STAT_CONDITION_MET) ||
218 /* Next two "intermediate" statuses are obsolete in SAM-4 */
219 (status == SAM_STAT_INTERMEDIATE) ||
220 (status == SAM_STAT_INTERMEDIATE_CONDITION_MET) ||
221 /* FIXME: this is obsolete in SAM-3 */
222 (status == SAM_STAT_COMMAND_TERMINATED));
223 }
224
225 #endif /* _SCSI_SCSI_H */
226
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