2 * Copyright (c) 2003 Silicon Graphics International Corp.
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30 * $Id: //depot/users/kenm/FreeBSD-test2/sys/cam/ctl/ctl_backend.h#2 $
34 * CTL backend driver definitions
36 * Author: Ken Merry <ken@FreeBSD.org>
39 #ifndef _CTL_BACKEND_H_
40 #define _CTL_BACKEND_H_
43 * XXX KDM move this to another header file?
45 #define CTL_BE_NAME_LEN 32
48 * The ID_REQ flag is used to say that the caller has requested a
49 * particular LUN ID in the req_lun_id field. If we cannot allocate that
50 * LUN ID, the ctl_add_lun() call will fail.
52 * The POWERED_OFF flag tells us that the LUN should default to the powered
53 * off state. It will return 0x04,0x02 until it is powered up. ("Logical
54 * unit not ready, initializing command required.")
56 * The INOPERABLE flag tells us that this LUN is not operable for whatever
57 * reason. This means that user data may have been (or has been?) lost.
58 * We will return 0x31,0x00 ("Medium format corrupted") until the host
59 * issues a FORMAT UNIT command to clear the error.
61 * The PRIMARY flag tells us that this LUN is registered as a Primary LUN
62 * which is accessible via the Master shelf controller in an HA. This flag
63 * being set indicates a Primary LUN. This flag being reset represents a
64 * Secondary LUN controlled by the Secondary controller in an HA
65 * configuration. Flag is applicable at this time to T_DIRECT types.
67 * The SERIAL_NUM flag tells us that the serial_num field is filled in and
68 * valid for use in SCSI INQUIRY VPD page 0x80.
70 * The DEVID flag tells us that the device_id field is filled in and
71 * valid for use in SCSI INQUIRY VPD page 0x83.
73 * The DEV_TYPE flag tells us that the device_type field is filled in.
76 CTL_LUN_FLAG_ID_REQ = 0x01,
77 CTL_LUN_FLAG_POWERED_OFF = 0x02,
78 CTL_LUN_FLAG_INOPERABLE = 0x04,
79 CTL_LUN_FLAG_PRIMARY = 0x08,
80 CTL_LUN_FLAG_SERIAL_NUM = 0x10,
81 CTL_LUN_FLAG_DEVID = 0x20,
82 CTL_LUN_FLAG_DEV_TYPE = 0x40
83 } ctl_backend_lun_flags;
87 #define CTL_BACKEND_DECLARE(name, driver) \
88 static int name ## _modevent(module_t mod, int type, void *data) \
92 ctl_backend_register( \
93 (struct ctl_backend_driver *)data); \
96 printf(#name " module unload - not possible for this module type\n"); \
103 static moduledata_t name ## _mod = { \
108 DECLARE_MODULE(name, name ## _mod, SI_SUB_CONFIGURE, SI_ORDER_FOURTH); \
109 MODULE_DEPEND(name, ctl, 1, 1, 1); \
110 MODULE_DEPEND(name, cam, 1, 1, 1)
115 CTL_LUN_CONFIG_FAILURE
116 } ctl_lun_config_status;
118 typedef void (*be_callback_t)(void *be_lun);
119 typedef void (*be_lun_config_t)(void *be_lun,
120 ctl_lun_config_status status);
123 * The lun_type field is the SCSI device type of this particular LUN. In
124 * general, this should be T_DIRECT, although backends will want to create
125 * a processor LUN, typically at LUN 0. See scsi_all.h for the defines for
126 * the various SCSI device types.
128 * The flags are described above.
130 * The be_lun field is the backend driver's own context that will get
131 * passsed back so that it can tell which LUN CTL is referencing.
133 * maxlba is the maximum accessible LBA on the LUN. Note that this is
134 * different from the capacity of the array. capacity = maxlba + 1
136 * blocksize is the size, in bytes, of each LBA on the LUN. In general
137 * this should be 512. In theory CTL should be able to handle other block
138 * sizes. Host application software may not deal with it very well, though.
140 * req_lun_id is the requested LUN ID. CTL only pays attention to this
141 * field if the CTL_LUN_FLAG_ID_REQ flag is set. If the requested LUN ID is
142 * not available, the LUN addition will fail. If a particular LUN ID isn't
143 * requested, the first available LUN ID will be allocated.
145 * serial_num is the device serial number returned in the SCSI INQUIRY VPD
146 * page 0x80. This should be a unique, per-shelf value. The data inside
147 * this field should be ASCII only, left aligned, and any unused space
148 * should be padded out with ASCII spaces. This field should NOT be NULL
151 * device_id is the T10 device identifier returned in the SCSI INQUIRY VPD
152 * page 0x83. This should be a unique, per-LUN value. The data inside
153 * this field should be ASCII only, left aligned, and any unused space
154 * should be padded with ASCII spaces. This field should NOT be NULL
157 * The lun_shutdown() method is the callback for the ctl_invalidate_lun()
158 * call. It is called when all outstanding I/O for that LUN has been
159 * completed and CTL has deleted the resources for that LUN. When the CTL
160 * backend gets this call, it can safely free its per-LUN resources.
162 * The lun_config_status() method is the callback for the ctl_add_lun()
163 * call. It is called when the LUN is successfully added, or when LUN
164 * addition fails. If the LUN is successfully added, the backend may call
165 * the ctl_enable_lun() method to enable the LUN.
167 * The be field is a pointer to the ctl_backend_driver structure, which
168 * contains the backend methods to be called by CTL.
170 * The ctl_lun field is for CTL internal use only, and should not be used
173 * The links field is for CTL internal use only, and should not be used by
176 struct ctl_be_lun_option {
177 STAILQ_ENTRY(ctl_be_lun_option) links;
183 uint8_t lun_type; /* passed to CTL */
184 ctl_backend_lun_flags flags; /* passed to CTL */
185 void *be_lun; /* passed to CTL */
186 uint64_t maxlba; /* passed to CTL */
187 uint32_t blocksize; /* passed to CTL */
188 uint32_t req_lun_id; /* passed to CTL */
189 uint32_t lun_id; /* returned from CTL */
190 uint8_t serial_num[CTL_SN_LEN]; /* passed to CTL */
191 uint8_t device_id[CTL_DEVID_LEN];/* passed to CTL */
192 be_callback_t lun_shutdown; /* passed to CTL */
193 be_lun_config_t lun_config_status; /* passed to CTL */
194 struct ctl_backend_driver *be; /* passed to CTL */
195 void *ctl_lun; /* used by CTL */
196 STAILQ_HEAD(, ctl_be_lun_option) options; /* passed to CTL */
197 STAILQ_ENTRY(ctl_be_lun) links; /* used by CTL */
201 CTL_BE_FLAG_NONE = 0x00, /* no flags */
202 CTL_BE_FLAG_HAS_CONFIG = 0x01, /* can do config reads, writes */
203 CTL_BE_FLAG_INTERNAL = 0x02 /* don't inc mod refcount */
206 typedef int (*be_init_t)(void);
207 typedef int (*be_func_t)(union ctl_io *io);
208 typedef void (*be_vfunc_t)(union ctl_io *io);
209 typedef int (*be_ioctl_t)(struct cdev *dev, u_long cmd, caddr_t addr, int flag,
211 typedef int (*be_luninfo_t)(void *be_lun, struct sbuf *sb);
213 struct ctl_backend_driver {
214 char name[CTL_BE_NAME_LEN]; /* passed to CTL */
215 ctl_backend_flags flags; /* passed to CTL */
216 be_init_t init; /* passed to CTL */
217 be_func_t data_submit; /* passed to CTL */
218 be_func_t data_move_done; /* passed to CTL */
219 be_func_t config_read; /* passed to CTL */
220 be_func_t config_write; /* passed to CTL */
221 be_ioctl_t ioctl; /* passed to CTL */
222 be_luninfo_t lun_info; /* passed to CTL */
223 #ifdef CS_BE_CONFIG_MOVE_DONE_IS_NOT_USED
224 be_func_t config_move_done; /* passed to backend */
227 be_vfunc_t config_write_done; /* passed to backend */
229 u_int num_luns; /* used by CTL */
230 STAILQ_ENTRY(ctl_backend_driver) links; /* used by CTL */
233 int ctl_backend_register(struct ctl_backend_driver *be);
234 int ctl_backend_deregister(struct ctl_backend_driver *be);
235 struct ctl_backend_driver *ctl_backend_find(char *backend_name);
238 * To add a LUN, first call ctl_add_lun(). You will get the lun_config_status()
239 * callback when the LUN addition has either succeeded or failed.
241 * Once you get that callback, you can then call ctl_enable_lun() to enable
244 int ctl_add_lun(struct ctl_be_lun *be_lun);
245 int ctl_enable_lun(struct ctl_be_lun *be_lun);
248 * To delete a LUN, first call ctl_disable_lun(), then
249 * ctl_invalidate_lun(). You will get the lun_shutdown() callback when all
250 * I/O to the LUN has completed and the LUN has been deleted.
252 int ctl_disable_lun(struct ctl_be_lun *be_lun);
253 int ctl_invalidate_lun(struct ctl_be_lun *be_lun);
256 * To start a LUN (transition from powered off to powered on state) call
257 * ctl_start_lun(). To stop a LUN (transition from powered on to powered
258 * off state) call ctl_stop_lun().
260 int ctl_start_lun(struct ctl_be_lun *be_lun);
261 int ctl_stop_lun(struct ctl_be_lun *be_lun);
264 * If a LUN is inoperable, call ctl_lun_inoperable(). Generally the LUN
265 * will become operable once again when the user issues the SCSI FORMAT UNIT
266 * command. (CTL will automatically clear the inoperable flag.) If we
267 * need to re-enable the LUN, we can call ctl_lun_operable() to enable it
268 * without a SCSI command.
270 int ctl_lun_inoperable(struct ctl_be_lun *be_lun);
271 int ctl_lun_operable(struct ctl_be_lun *be_lun);
274 * If a LUN is locked on or unlocked from a power/APS standpoint, call
275 * ctl_lun_power_lock() to update the current status in CTL's APS subpage.
276 * Set the lock flag to 1 to lock the LUN, set it to 0 to unlock the LUN.
278 int ctl_lun_power_lock(struct ctl_be_lun *be_lun, struct ctl_nexus *nexus,
282 * To take a LUN offline, call ctl_lun_offline(). Generally the LUN will
283 * be online again once the user sends a SCSI START STOP UNIT command with
284 * the start and on/offline bits set. The backend can bring the LUN back
285 * online via the ctl_lun_online() function, if necessary.
287 int ctl_lun_offline(struct ctl_be_lun *be_lun);
288 int ctl_lun_online(struct ctl_be_lun *be_lun);
291 * Let the backend notify the initiator about changed capacity.
293 void ctl_lun_capacity_changed(struct ctl_be_lun *be_lun);
296 #endif /* _CTL_BACKEND_H_ */