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 <scsi/scsi_proto.h>
16 SCSI_DEFAULT_EH_TIMEOUT = 10 * HZ,
20 * The maximum number of SG segments that we will put inside a
21 * scatterlist (unless chaining is used). Should ideally fit inside a
22 * single page, to avoid a higher order allocation. We could define this
23 * to SG_MAX_SINGLE_ALLOC to pack correctly at the highest order. The
26 #define SCSI_MAX_SG_SEGMENTS 128
29 * Like SCSI_MAX_SG_SEGMENTS, but for archs that have sg chaining. This limit
30 * is totally arbitrary, a setting of 2048 will get you at least 8mb ios.
32 #ifdef CONFIG_ARCH_HAS_SG_CHAIN
33 #define SCSI_MAX_SG_CHAIN_SEGMENTS 2048
35 #define SCSI_MAX_SG_CHAIN_SEGMENTS SCSI_MAX_SG_SEGMENTS
39 * DIX-capable adapters effectively support infinite chaining for the
40 * protection information scatterlist
42 #define SCSI_MAX_PROT_SG_SEGMENTS 0xFFFF
45 * Special value for scanning to specify scanning or rescanning of all
46 * possible channels, (target) ids, or luns on a given shost.
48 #define SCAN_WILD_CARD ~0
50 static inline unsigned
51 scsi_varlen_cdb_length(const void *hdr)
53 return ((struct scsi_varlen_cdb_hdr *)hdr)->additional_cdb_length + 8;
56 extern const unsigned char scsi_command_size_tbl[8];
57 #define COMMAND_SIZE(opcode) scsi_command_size_tbl[((opcode) >> 5) & 7]
59 static inline unsigned
60 scsi_command_size(const unsigned char *cmnd)
62 return (cmnd[0] == VARIABLE_LENGTH_CMD) ?
63 scsi_varlen_cdb_length(cmnd) : COMMAND_SIZE(cmnd[0]);
70 scsi_register_acpi_bus_type(struct acpi_bus_type *bus);
73 scsi_unregister_acpi_bus_type(struct acpi_bus_type *bus);
76 /** scsi_status_is_good - check the status return.
78 * @status: the status passed up from the driver (including host and
81 * This returns true for known good conditions that may be treated as
82 * command completed normally
84 static inline int scsi_status_is_good(int status)
87 * FIXME: bit0 is listed as reserved in SCSI-2, but is
88 * significant in SCSI-3. For now, we follow the SCSI-2
89 * behaviour and ignore reserved bits.
92 return ((status == SAM_STAT_GOOD) ||
93 (status == SAM_STAT_INTERMEDIATE) ||
94 (status == SAM_STAT_INTERMEDIATE_CONDITION_MET) ||
95 /* FIXME: this is obsolete in SAM-3 */
96 (status == SAM_STAT_COMMAND_TERMINATED));
99 /* Returns a human-readable name for the device */
100 extern const char * scsi_device_type(unsigned type);
103 * standard mode-select header prepended to all mode-select commands
106 struct ccs_modesel_head {
107 __u8 _r1; /* reserved */
108 __u8 medium; /* device-specific medium type */
109 __u8 _r2; /* reserved */
110 __u8 block_desc_length; /* block descriptor length */
111 __u8 density; /* device-specific density code */
112 __u8 number_blocks_hi; /* number of blocks in this block desc */
113 __u8 number_blocks_med;
114 __u8 number_blocks_lo;
116 __u8 block_length_hi; /* block length for blocks in this desc */
117 __u8 block_length_med;
118 __u8 block_length_lo;
122 * The Well Known LUNS (SAM-3) in our int representation of a LUN
124 #define SCSI_W_LUN_BASE 0xc100
125 #define SCSI_W_LUN_REPORT_LUNS (SCSI_W_LUN_BASE + 1)
126 #define SCSI_W_LUN_ACCESS_CONTROL (SCSI_W_LUN_BASE + 2)
127 #define SCSI_W_LUN_TARGET_LOG_PAGE (SCSI_W_LUN_BASE + 3)
129 static inline int scsi_is_wlun(u64 lun)
131 return (lun & 0xff00) == SCSI_W_LUN_BASE;
139 #define COMMAND_COMPLETE 0x00
140 #define EXTENDED_MESSAGE 0x01
141 #define EXTENDED_MODIFY_DATA_POINTER 0x00
142 #define EXTENDED_SDTR 0x01
143 #define EXTENDED_EXTENDED_IDENTIFY 0x02 /* SCSI-I only */
144 #define EXTENDED_WDTR 0x03
145 #define EXTENDED_PPR 0x04
146 #define EXTENDED_MODIFY_BIDI_DATA_PTR 0x05
147 #define SAVE_POINTERS 0x02
148 #define RESTORE_POINTERS 0x03
149 #define DISCONNECT 0x04
150 #define INITIATOR_ERROR 0x05
151 #define ABORT_TASK_SET 0x06
152 #define MESSAGE_REJECT 0x07
154 #define MSG_PARITY_ERROR 0x09
155 #define LINKED_CMD_COMPLETE 0x0a
156 #define LINKED_FLG_CMD_COMPLETE 0x0b
157 #define TARGET_RESET 0x0c
158 #define ABORT_TASK 0x0d
159 #define CLEAR_TASK_SET 0x0e
160 #define INITIATE_RECOVERY 0x0f /* SCSI-II only */
161 #define RELEASE_RECOVERY 0x10 /* SCSI-II only */
162 #define CLEAR_ACA 0x16
163 #define LOGICAL_UNIT_RESET 0x17
164 #define SIMPLE_QUEUE_TAG 0x20
165 #define HEAD_OF_QUEUE_TAG 0x21
166 #define ORDERED_QUEUE_TAG 0x22
167 #define IGNORE_WIDE_RESIDUE 0x23
169 #define QAS_REQUEST 0x55
171 /* Old SCSI2 names, don't use in new code */
172 #define BUS_DEVICE_RESET TARGET_RESET
173 #define ABORT ABORT_TASK_SET
179 #define DID_OK 0x00 /* NO error */
180 #define DID_NO_CONNECT 0x01 /* Couldn't connect before timeout period */
181 #define DID_BUS_BUSY 0x02 /* BUS stayed busy through time out period */
182 #define DID_TIME_OUT 0x03 /* TIMED OUT for other reason */
183 #define DID_BAD_TARGET 0x04 /* BAD target. */
184 #define DID_ABORT 0x05 /* Told to abort for some other reason */
185 #define DID_PARITY 0x06 /* Parity error */
186 #define DID_ERROR 0x07 /* Internal error */
187 #define DID_RESET 0x08 /* Reset by somebody. */
188 #define DID_BAD_INTR 0x09 /* Got an interrupt we weren't expecting. */
189 #define DID_PASSTHROUGH 0x0a /* Force command past mid-layer */
190 #define DID_SOFT_ERROR 0x0b /* The low level driver just wish a retry */
191 #define DID_IMM_RETRY 0x0c /* Retry without decrementing retry count */
192 #define DID_REQUEUE 0x0d /* Requeue command (no immediate retry) also
193 * without decrementing the retry count */
194 #define DID_TRANSPORT_DISRUPTED 0x0e /* Transport error disrupted execution
195 * and the driver blocked the port to
196 * recover the link. Transport class will
197 * retry or fail IO */
198 #define DID_TRANSPORT_FAILFAST 0x0f /* Transport class fastfailed the io */
199 #define DID_TARGET_FAILURE 0x10 /* Permanent target failure, do not retry on
201 #define DID_NEXUS_FAILURE 0x11 /* Permanent nexus failure, retry on other
202 * paths might yield different results */
203 #define DID_ALLOC_FAILURE 0x12 /* Space allocation on the device failed */
204 #define DID_MEDIUM_ERROR 0x13 /* Medium error */
205 #define DRIVER_OK 0x00 /* Driver status */
208 * These indicate the error that occurred, and what is available.
211 #define DRIVER_BUSY 0x01
212 #define DRIVER_SOFT 0x02
213 #define DRIVER_MEDIA 0x03
214 #define DRIVER_ERROR 0x04
216 #define DRIVER_INVALID 0x05
217 #define DRIVER_TIMEOUT 0x06
218 #define DRIVER_HARD 0x07
219 #define DRIVER_SENSE 0x08
222 * Internal return values.
225 #define NEEDS_RETRY 0x2001
226 #define SUCCESS 0x2002
227 #define FAILED 0x2003
228 #define QUEUED 0x2004
229 #define SOFT_ERROR 0x2005
230 #define ADD_TO_MLQUEUE 0x2006
231 #define TIMEOUT_ERROR 0x2007
232 #define SCSI_RETURN_NOT_HANDLED 0x2008
233 #define FAST_IO_FAIL 0x2009
236 * Midlevel queue return values.
238 #define SCSI_MLQUEUE_HOST_BUSY 0x1055
239 #define SCSI_MLQUEUE_DEVICE_BUSY 0x1056
240 #define SCSI_MLQUEUE_EH_RETRY 0x1057
241 #define SCSI_MLQUEUE_TARGET_BUSY 0x1058
244 * Use these to separate status msg and our bytes
248 * status byte = set from target device
249 * msg_byte = return status from host adapter itself.
250 * host_byte = set by low-level driver to indicate status.
251 * driver_byte = set by mid-level.
253 #define status_byte(result) (((result) >> 1) & 0x7f)
254 #define msg_byte(result) (((result) >> 8) & 0xff)
255 #define host_byte(result) (((result) >> 16) & 0xff)
256 #define driver_byte(result) (((result) >> 24) & 0xff)
258 #define sense_class(sense) (((sense) >> 4) & 0x7)
259 #define sense_error(sense) ((sense) & 0xf)
260 #define sense_valid(sense) ((sense) & 0x80)
265 #define FORMAT_UNIT_TIMEOUT (2 * 60 * 60 * HZ)
266 #define START_STOP_TIMEOUT (60 * HZ)
267 #define MOVE_MEDIUM_TIMEOUT (5 * 60 * HZ)
268 #define READ_ELEMENT_STATUS_TIMEOUT (5 * 60 * HZ)
269 #define READ_DEFECT_DATA_TIMEOUT (60 * HZ )
272 #define IDENTIFY_BASE 0x80
273 #define IDENTIFY(can_disconnect, lun) (IDENTIFY_BASE |\
274 ((can_disconnect) ? 0x40 : 0) |\
278 * struct scsi_device::scsi_level values. For SCSI devices other than those
279 * prior to SCSI-2 (i.e. over 12 years old) this value is (resp[2] + 1)
280 * where "resp" is a byte array of the response to an INQUIRY. The scsi_level
281 * variable is visible to the user via sysfs.
284 #define SCSI_UNKNOWN 0
288 #define SCSI_3 4 /* SPC */
293 * INQ PERIPHERAL QUALIFIERS
295 #define SCSI_INQ_PQ_CON 0x00
296 #define SCSI_INQ_PQ_NOT_CON 0x01
297 #define SCSI_INQ_PQ_NOT_CAP 0x03
301 * Here are some scsi specific ioctl commands which are sometimes useful.
303 * Note that include/linux/cdrom.h also defines IOCTL 0x5300 - 0x5395
306 /* Used to obtain PUN and LUN info. Conflicts with CDROMAUDIOBUFSIZ */
307 #define SCSI_IOCTL_GET_IDLUN 0x5382
309 /* 0x5383 and 0x5384 were used for SCSI_IOCTL_TAGGED_{ENABLE,DISABLE} */
311 /* Used to obtain the host number of a device. */
312 #define SCSI_IOCTL_PROBE_HOST 0x5385
314 /* Used to obtain the bus number for a device */
315 #define SCSI_IOCTL_GET_BUS_NUMBER 0x5386
317 /* Used to obtain the PCI location of a device */
318 #define SCSI_IOCTL_GET_PCI 0x5387
320 /* Pull a u32 out of a SCSI message (using BE SCSI conventions) */
321 static inline __u32 scsi_to_u32(__u8 *ptr)
323 return (ptr[0]<<24) + (ptr[1]<<16) + (ptr[2]<<8) + ptr[3];
326 #endif /* _SCSI_SCSI_H */