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 #include <linux/scatterlist.h>
11 #include <linux/kernel.h>
12 #include <scsi/scsi_common.h>
13 #include <scsi/scsi_proto.h>
14
15 struct scsi_cmnd;
16
17 enum scsi_timeouts {
18 SCSI_DEFAULT_EH_TIMEOUT = 10 * HZ,
19 };
20
21 /*
22 * DIX-capable adapters effectively support infinite chaining for the
23 * protection information scatterlist
24 */
25 #define SCSI_MAX_PROT_SG_SEGMENTS 0xFFFF
26
27 /*
28 * Special value for scanning to specify scanning or rescanning of all
29 * possible channels, (target) ids, or luns on a given shost.
30 */
31 #define SCAN_WILD_CARD ~0
32
33 /** scsi_status_is_good - check the status return.
34 *
35 * @status: the status passed up from the driver (including host and
36 * driver components)
37 *
38 * This returns true for known good conditions that may be treated as
39 * command completed normally
40 */
scsi_status_is_good(int status)41 static inline int scsi_status_is_good(int status)
42 {
43 /*
44 * FIXME: bit0 is listed as reserved in SCSI-2, but is
45 * significant in SCSI-3. For now, we follow the SCSI-2
46 * behaviour and ignore reserved bits.
47 */
48 status &= 0xfe;
49 return ((status == SAM_STAT_GOOD) ||
50 (status == SAM_STAT_CONDITION_MET) ||
51 /* Next two "intermediate" statuses are obsolete in SAM-4 */
52 (status == SAM_STAT_INTERMEDIATE) ||
53 (status == SAM_STAT_INTERMEDIATE_CONDITION_MET) ||
54 /* FIXME: this is obsolete in SAM-3 */
55 (status == SAM_STAT_COMMAND_TERMINATED));
56 }
57
58
59 /*
60 * standard mode-select header prepended to all mode-select commands
61 */
62
63 struct ccs_modesel_head {
64 __u8 _r1; /* reserved */
65 __u8 medium; /* device-specific medium type */
66 __u8 _r2; /* reserved */
67 __u8 block_desc_length; /* block descriptor length */
68 __u8 density; /* device-specific density code */
69 __u8 number_blocks_hi; /* number of blocks in this block desc */
70 __u8 number_blocks_med;
71 __u8 number_blocks_lo;
72 __u8 _r3;
73 __u8 block_length_hi; /* block length for blocks in this desc */
74 __u8 block_length_med;
75 __u8 block_length_lo;
76 };
77
78 /*
79 * The Well Known LUNS (SAM-3) in our int representation of a LUN
80 */
81 #define SCSI_W_LUN_BASE 0xc100
82 #define SCSI_W_LUN_REPORT_LUNS (SCSI_W_LUN_BASE + 1)
83 #define SCSI_W_LUN_ACCESS_CONTROL (SCSI_W_LUN_BASE + 2)
84 #define SCSI_W_LUN_TARGET_LOG_PAGE (SCSI_W_LUN_BASE + 3)
85
scsi_is_wlun(u64 lun)86 static inline int scsi_is_wlun(u64 lun)
87 {
88 return (lun & 0xff00) == SCSI_W_LUN_BASE;
89 }
90
91
92 /*
93 * MESSAGE CODES
94 */
95
96 #define COMMAND_COMPLETE 0x00
97 #define EXTENDED_MESSAGE 0x01
98 #define EXTENDED_MODIFY_DATA_POINTER 0x00
99 #define EXTENDED_SDTR 0x01
100 #define EXTENDED_EXTENDED_IDENTIFY 0x02 /* SCSI-I only */
101 #define EXTENDED_WDTR 0x03
102 #define EXTENDED_PPR 0x04
103 #define EXTENDED_MODIFY_BIDI_DATA_PTR 0x05
104 #define SAVE_POINTERS 0x02
105 #define RESTORE_POINTERS 0x03
106 #define DISCONNECT 0x04
107 #define INITIATOR_ERROR 0x05
108 #define ABORT_TASK_SET 0x06
109 #define MESSAGE_REJECT 0x07
110 #define NOP 0x08
111 #define MSG_PARITY_ERROR 0x09
112 #define LINKED_CMD_COMPLETE 0x0a
113 #define LINKED_FLG_CMD_COMPLETE 0x0b
114 #define TARGET_RESET 0x0c
115 #define ABORT_TASK 0x0d
116 #define CLEAR_TASK_SET 0x0e
117 #define INITIATE_RECOVERY 0x0f /* SCSI-II only */
118 #define RELEASE_RECOVERY 0x10 /* SCSI-II only */
119 #define CLEAR_ACA 0x16
120 #define LOGICAL_UNIT_RESET 0x17
121 #define SIMPLE_QUEUE_TAG 0x20
122 #define HEAD_OF_QUEUE_TAG 0x21
123 #define ORDERED_QUEUE_TAG 0x22
124 #define IGNORE_WIDE_RESIDUE 0x23
125 #define ACA 0x24
126 #define QAS_REQUEST 0x55
127
128 /* Old SCSI2 names, don't use in new code */
129 #define BUS_DEVICE_RESET TARGET_RESET
130 #define ABORT ABORT_TASK_SET
131
132 /*
133 * Host byte codes
134 */
135
136 #define DID_OK 0x00 /* NO error */
137 #define DID_NO_CONNECT 0x01 /* Couldn't connect before timeout period */
138 #define DID_BUS_BUSY 0x02 /* BUS stayed busy through time out period */
139 #define DID_TIME_OUT 0x03 /* TIMED OUT for other reason */
140 #define DID_BAD_TARGET 0x04 /* BAD target. */
141 #define DID_ABORT 0x05 /* Told to abort for some other reason */
142 #define DID_PARITY 0x06 /* Parity error */
143 #define DID_ERROR 0x07 /* Internal error */
144 #define DID_RESET 0x08 /* Reset by somebody. */
145 #define DID_BAD_INTR 0x09 /* Got an interrupt we weren't expecting. */
146 #define DID_PASSTHROUGH 0x0a /* Force command past mid-layer */
147 #define DID_SOFT_ERROR 0x0b /* The low level driver just wish a retry */
148 #define DID_IMM_RETRY 0x0c /* Retry without decrementing retry count */
149 #define DID_REQUEUE 0x0d /* Requeue command (no immediate retry) also
150 * without decrementing the retry count */
151 #define DID_TRANSPORT_DISRUPTED 0x0e /* Transport error disrupted execution
152 * and the driver blocked the port to
153 * recover the link. Transport class will
154 * retry or fail IO */
155 #define DID_TRANSPORT_FAILFAST 0x0f /* Transport class fastfailed the io */
156 #define DID_TARGET_FAILURE 0x10 /* Permanent target failure, do not retry on
157 * other paths */
158 #define DID_NEXUS_FAILURE 0x11 /* Permanent nexus failure, retry on other
159 * paths might yield different results */
160 #define DID_ALLOC_FAILURE 0x12 /* Space allocation on the device failed */
161 #define DID_MEDIUM_ERROR 0x13 /* Medium error */
162 #define DRIVER_OK 0x00 /* Driver status */
163
164 /*
165 * These indicate the error that occurred, and what is available.
166 */
167
168 #define DRIVER_BUSY 0x01
169 #define DRIVER_SOFT 0x02
170 #define DRIVER_MEDIA 0x03
171 #define DRIVER_ERROR 0x04
172
173 #define DRIVER_INVALID 0x05
174 #define DRIVER_TIMEOUT 0x06
175 #define DRIVER_HARD 0x07
176 #define DRIVER_SENSE 0x08
177
178 /*
179 * Internal return values.
180 */
181
182 #define NEEDS_RETRY 0x2001
183 #define SUCCESS 0x2002
184 #define FAILED 0x2003
185 #define QUEUED 0x2004
186 #define SOFT_ERROR 0x2005
187 #define ADD_TO_MLQUEUE 0x2006
188 #define TIMEOUT_ERROR 0x2007
189 #define SCSI_RETURN_NOT_HANDLED 0x2008
190 #define FAST_IO_FAIL 0x2009
191
192 /*
193 * Midlevel queue return values.
194 */
195 #define SCSI_MLQUEUE_HOST_BUSY 0x1055
196 #define SCSI_MLQUEUE_DEVICE_BUSY 0x1056
197 #define SCSI_MLQUEUE_EH_RETRY 0x1057
198 #define SCSI_MLQUEUE_TARGET_BUSY 0x1058
199
200 /*
201 * Use these to separate status msg and our bytes
202 *
203 * These are set by:
204 *
205 * status byte = set from target device
206 * msg_byte = return status from host adapter itself.
207 * host_byte = set by low-level driver to indicate status.
208 * driver_byte = set by mid-level.
209 */
210 #define status_byte(result) (((result) >> 1) & 0x7f)
211 #define msg_byte(result) (((result) >> 8) & 0xff)
212 #define host_byte(result) (((result) >> 16) & 0xff)
213 #define driver_byte(result) (((result) >> 24) & 0xff)
214
215 #define sense_class(sense) (((sense) >> 4) & 0x7)
216 #define sense_error(sense) ((sense) & 0xf)
217 #define sense_valid(sense) ((sense) & 0x80)
218
219 /*
220 * default timeouts
221 */
222 #define FORMAT_UNIT_TIMEOUT (2 * 60 * 60 * HZ)
223 #define START_STOP_TIMEOUT (60 * HZ)
224 #define MOVE_MEDIUM_TIMEOUT (5 * 60 * HZ)
225 #define READ_ELEMENT_STATUS_TIMEOUT (5 * 60 * HZ)
226 #define READ_DEFECT_DATA_TIMEOUT (60 * HZ )
227
228
229 #define IDENTIFY_BASE 0x80
230 #define IDENTIFY(can_disconnect, lun) (IDENTIFY_BASE |\
231 ((can_disconnect) ? 0x40 : 0) |\
232 ((lun) & 0x07))
233
234 /*
235 * struct scsi_device::scsi_level values. For SCSI devices other than those
236 * prior to SCSI-2 (i.e. over 12 years old) this value is (resp[2] + 1)
237 * where "resp" is a byte array of the response to an INQUIRY. The scsi_level
238 * variable is visible to the user via sysfs.
239 */
240
241 #define SCSI_UNKNOWN 0
242 #define SCSI_1 1
243 #define SCSI_1_CCS 2
244 #define SCSI_2 3
245 #define SCSI_3 4 /* SPC */
246 #define SCSI_SPC_2 5
247 #define SCSI_SPC_3 6
248
249 /*
250 * INQ PERIPHERAL QUALIFIERS
251 */
252 #define SCSI_INQ_PQ_CON 0x00
253 #define SCSI_INQ_PQ_NOT_CON 0x01
254 #define SCSI_INQ_PQ_NOT_CAP 0x03
255
256
257 /*
258 * Here are some scsi specific ioctl commands which are sometimes useful.
259 *
260 * Note that include/linux/cdrom.h also defines IOCTL 0x5300 - 0x5395
261 */
262
263 /* Used to obtain PUN and LUN info. Conflicts with CDROMAUDIOBUFSIZ */
264 #define SCSI_IOCTL_GET_IDLUN 0x5382
265
266 /* 0x5383 and 0x5384 were used for SCSI_IOCTL_TAGGED_{ENABLE,DISABLE} */
267
268 /* Used to obtain the host number of a device. */
269 #define SCSI_IOCTL_PROBE_HOST 0x5385
270
271 /* Used to obtain the bus number for a device */
272 #define SCSI_IOCTL_GET_BUS_NUMBER 0x5386
273
274 /* Used to obtain the PCI location of a device */
275 #define SCSI_IOCTL_GET_PCI 0x5387
276
277 #endif /* _SCSI_SCSI_H */
278
