2 * This header file contains public constants and structures used by
3 * the SCSI initiator code.
8 #include <linux/types.h>
9 #include <linux/scatterlist.h>
10 #include <linux/kernel.h>
11 #include <linux/device.h>
12 #include <scsi/scsi_common.h>
13 #include <scsi/scsi_proto.h>
18 SCSI_DEFAULT_EH_TIMEOUT = 10 * HZ,
22 * The maximum number of SG segments that we will put inside a
23 * scatterlist (unless chaining is used). Should ideally fit inside a
24 * single page, to avoid a higher order allocation. We could define this
25 * to SG_MAX_SINGLE_ALLOC to pack correctly at the highest order. The
28 #define SCSI_MAX_SG_SEGMENTS 128
31 * Like SCSI_MAX_SG_SEGMENTS, but for archs that have sg chaining. This limit
32 * is totally arbitrary, a setting of 2048 will get you at least 8mb ios.
34 #ifdef CONFIG_ARCH_HAS_SG_CHAIN
35 #define SCSI_MAX_SG_CHAIN_SEGMENTS 2048
37 #define SCSI_MAX_SG_CHAIN_SEGMENTS SCSI_MAX_SG_SEGMENTS
41 * DIX-capable adapters effectively support infinite chaining for the
42 * protection information scatterlist
44 #define SCSI_MAX_PROT_SG_SEGMENTS 0xFFFF
47 * Special value for scanning to specify scanning or rescanning of all
48 * possible channels, (target) ids, or luns on a given shost.
50 #define SCAN_WILD_CARD ~0
56 scsi_register_acpi_bus_type(struct acpi_bus_type *bus);
59 scsi_unregister_acpi_bus_type(struct acpi_bus_type *bus);
62 /** scsi_status_is_good - check the status return.
64 * @status: the status passed up from the driver (including host and
67 * This returns true for known good conditions that may be treated as
68 * command completed normally
70 static inline int scsi_status_is_good(int status)
73 * FIXME: bit0 is listed as reserved in SCSI-2, but is
74 * significant in SCSI-3. For now, we follow the SCSI-2
75 * behaviour and ignore reserved bits.
78 return ((status == SAM_STAT_GOOD) ||
79 (status == SAM_STAT_INTERMEDIATE) ||
80 (status == SAM_STAT_INTERMEDIATE_CONDITION_MET) ||
81 /* FIXME: this is obsolete in SAM-3 */
82 (status == SAM_STAT_COMMAND_TERMINATED));
87 * standard mode-select header prepended to all mode-select commands
90 struct ccs_modesel_head {
91 __u8 _r1; /* reserved */
92 __u8 medium; /* device-specific medium type */
93 __u8 _r2; /* reserved */
94 __u8 block_desc_length; /* block descriptor length */
95 __u8 density; /* device-specific density code */
96 __u8 number_blocks_hi; /* number of blocks in this block desc */
97 __u8 number_blocks_med;
98 __u8 number_blocks_lo;
100 __u8 block_length_hi; /* block length for blocks in this desc */
101 __u8 block_length_med;
102 __u8 block_length_lo;
106 * The Well Known LUNS (SAM-3) in our int representation of a LUN
108 #define SCSI_W_LUN_BASE 0xc100
109 #define SCSI_W_LUN_REPORT_LUNS (SCSI_W_LUN_BASE + 1)
110 #define SCSI_W_LUN_ACCESS_CONTROL (SCSI_W_LUN_BASE + 2)
111 #define SCSI_W_LUN_TARGET_LOG_PAGE (SCSI_W_LUN_BASE + 3)
113 static inline int scsi_is_wlun(u64 lun)
115 return (lun & 0xff00) == SCSI_W_LUN_BASE;
123 #define COMMAND_COMPLETE 0x00
124 #define EXTENDED_MESSAGE 0x01
125 #define EXTENDED_MODIFY_DATA_POINTER 0x00
126 #define EXTENDED_SDTR 0x01
127 #define EXTENDED_EXTENDED_IDENTIFY 0x02 /* SCSI-I only */
128 #define EXTENDED_WDTR 0x03
129 #define EXTENDED_PPR 0x04
130 #define EXTENDED_MODIFY_BIDI_DATA_PTR 0x05
131 #define SAVE_POINTERS 0x02
132 #define RESTORE_POINTERS 0x03
133 #define DISCONNECT 0x04
134 #define INITIATOR_ERROR 0x05
135 #define ABORT_TASK_SET 0x06
136 #define MESSAGE_REJECT 0x07
138 #define MSG_PARITY_ERROR 0x09
139 #define LINKED_CMD_COMPLETE 0x0a
140 #define LINKED_FLG_CMD_COMPLETE 0x0b
141 #define TARGET_RESET 0x0c
142 #define ABORT_TASK 0x0d
143 #define CLEAR_TASK_SET 0x0e
144 #define INITIATE_RECOVERY 0x0f /* SCSI-II only */
145 #define RELEASE_RECOVERY 0x10 /* SCSI-II only */
146 #define CLEAR_ACA 0x16
147 #define LOGICAL_UNIT_RESET 0x17
148 #define SIMPLE_QUEUE_TAG 0x20
149 #define HEAD_OF_QUEUE_TAG 0x21
150 #define ORDERED_QUEUE_TAG 0x22
151 #define IGNORE_WIDE_RESIDUE 0x23
153 #define QAS_REQUEST 0x55
155 /* Old SCSI2 names, don't use in new code */
156 #define BUS_DEVICE_RESET TARGET_RESET
157 #define ABORT ABORT_TASK_SET
163 #define DID_OK 0x00 /* NO error */
164 #define DID_NO_CONNECT 0x01 /* Couldn't connect before timeout period */
165 #define DID_BUS_BUSY 0x02 /* BUS stayed busy through time out period */
166 #define DID_TIME_OUT 0x03 /* TIMED OUT for other reason */
167 #define DID_BAD_TARGET 0x04 /* BAD target. */
168 #define DID_ABORT 0x05 /* Told to abort for some other reason */
169 #define DID_PARITY 0x06 /* Parity error */
170 #define DID_ERROR 0x07 /* Internal error */
171 #define DID_RESET 0x08 /* Reset by somebody. */
172 #define DID_BAD_INTR 0x09 /* Got an interrupt we weren't expecting. */
173 #define DID_PASSTHROUGH 0x0a /* Force command past mid-layer */
174 #define DID_SOFT_ERROR 0x0b /* The low level driver just wish a retry */
175 #define DID_IMM_RETRY 0x0c /* Retry without decrementing retry count */
176 #define DID_REQUEUE 0x0d /* Requeue command (no immediate retry) also
177 * without decrementing the retry count */
178 #define DID_TRANSPORT_DISRUPTED 0x0e /* Transport error disrupted execution
179 * and the driver blocked the port to
180 * recover the link. Transport class will
181 * retry or fail IO */
182 #define DID_TRANSPORT_FAILFAST 0x0f /* Transport class fastfailed the io */
183 #define DID_TARGET_FAILURE 0x10 /* Permanent target failure, do not retry on
185 #define DID_NEXUS_FAILURE 0x11 /* Permanent nexus failure, retry on other
186 * paths might yield different results */
187 #define DID_ALLOC_FAILURE 0x12 /* Space allocation on the device failed */
188 #define DID_MEDIUM_ERROR 0x13 /* Medium error */
189 #define DRIVER_OK 0x00 /* Driver status */
192 * These indicate the error that occurred, and what is available.
195 #define DRIVER_BUSY 0x01
196 #define DRIVER_SOFT 0x02
197 #define DRIVER_MEDIA 0x03
198 #define DRIVER_ERROR 0x04
200 #define DRIVER_INVALID 0x05
201 #define DRIVER_TIMEOUT 0x06
202 #define DRIVER_HARD 0x07
203 #define DRIVER_SENSE 0x08
206 * Internal return values.
209 #define NEEDS_RETRY 0x2001
210 #define SUCCESS 0x2002
211 #define FAILED 0x2003
212 #define QUEUED 0x2004
213 #define SOFT_ERROR 0x2005
214 #define ADD_TO_MLQUEUE 0x2006
215 #define TIMEOUT_ERROR 0x2007
216 #define SCSI_RETURN_NOT_HANDLED 0x2008
217 #define FAST_IO_FAIL 0x2009
220 * Midlevel queue return values.
222 #define SCSI_MLQUEUE_HOST_BUSY 0x1055
223 #define SCSI_MLQUEUE_DEVICE_BUSY 0x1056
224 #define SCSI_MLQUEUE_EH_RETRY 0x1057
225 #define SCSI_MLQUEUE_TARGET_BUSY 0x1058
228 * Use these to separate status msg and our bytes
232 * status byte = set from target device
233 * msg_byte = return status from host adapter itself.
234 * host_byte = set by low-level driver to indicate status.
235 * driver_byte = set by mid-level.
237 #define status_byte(result) (((result) >> 1) & 0x7f)
238 #define msg_byte(result) (((result) >> 8) & 0xff)
239 #define host_byte(result) (((result) >> 16) & 0xff)
240 #define driver_byte(result) (((result) >> 24) & 0xff)
242 #define sense_class(sense) (((sense) >> 4) & 0x7)
243 #define sense_error(sense) ((sense) & 0xf)
244 #define sense_valid(sense) ((sense) & 0x80)
249 #define FORMAT_UNIT_TIMEOUT (2 * 60 * 60 * HZ)
250 #define START_STOP_TIMEOUT (60 * HZ)
251 #define MOVE_MEDIUM_TIMEOUT (5 * 60 * HZ)
252 #define READ_ELEMENT_STATUS_TIMEOUT (5 * 60 * HZ)
253 #define READ_DEFECT_DATA_TIMEOUT (60 * HZ )
256 #define IDENTIFY_BASE 0x80
257 #define IDENTIFY(can_disconnect, lun) (IDENTIFY_BASE |\
258 ((can_disconnect) ? 0x40 : 0) |\
262 * struct scsi_device::scsi_level values. For SCSI devices other than those
263 * prior to SCSI-2 (i.e. over 12 years old) this value is (resp[2] + 1)
264 * where "resp" is a byte array of the response to an INQUIRY. The scsi_level
265 * variable is visible to the user via sysfs.
268 #define SCSI_UNKNOWN 0
272 #define SCSI_3 4 /* SPC */
277 * INQ PERIPHERAL QUALIFIERS
279 #define SCSI_INQ_PQ_CON 0x00
280 #define SCSI_INQ_PQ_NOT_CON 0x01
281 #define SCSI_INQ_PQ_NOT_CAP 0x03
283 /* Pull a u32 out of a SCSI message (using BE SCSI conventions) */
284 static inline __u32 scsi_to_u32(__u8 *ptr)
286 return (ptr[0]<<24) + (ptr[1]<<16) + (ptr[2]<<8) + ptr[3];
289 struct scsi_disk *scsi_disk_get_from_dev(struct device *dev);
291 struct gendisk *scsi_gendisk_get_from_dev(struct device *dev);
292 void scsi_gendisk_put(struct device *dev);
294 #endif /* _SCSI_SCSI_H */