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