2 * SPDX-License-Identifier: BSD-2-Clause
4 * Copyright (c) 2003 Silicon Graphics International Corp.
5 * Copyright (c) 2014-2017 Alexander Motin <mav@FreeBSD.org>
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9 * modification, are permitted provided that the following conditions
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13 * without modification.
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17 * including a substantially similar Disclaimer requirement for further
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33 * $Id: //depot/users/kenm/FreeBSD-test2/sys/cam/ctl/ctl_backend.h#2 $
37 * CTL backend driver definitions
39 * Author: Ken Merry <ken@FreeBSD.org>
42 #ifndef _CTL_BACKEND_H_
43 #define _CTL_BACKEND_H_
45 #include <cam/ctl/ctl_ioctl.h>
57 #define CTL_BACKEND_DECLARE(name, driver) \
58 static int name ## _modevent(module_t mod, int type, void *data) \
62 return (ctl_backend_register( \
63 (struct ctl_backend_driver *)data)); \
66 return (ctl_backend_deregister( \
67 (struct ctl_backend_driver *)data)); \
74 static moduledata_t name ## _mod = { \
79 DECLARE_MODULE(name, name ## _mod, SI_SUB_CONFIGURE, SI_ORDER_FOURTH); \
80 MODULE_DEPEND(name, ctl, 1, 1, 1); \
81 MODULE_DEPEND(name, cam, 1, 1, 1)
84 typedef void (*be_callback_t)(struct ctl_be_lun *be_lun);
87 * The lun_type field is the SCSI device type of this particular LUN. In
88 * general, this should be T_DIRECT, although backends will want to create
89 * a processor LUN, typically at LUN 0. See scsi_all.h for the defines for
90 * the various SCSI device types.
92 * The flags are described above.
94 * The be_lun field is the backend driver's own context that will get
95 * passsed back so that it can tell which LUN CTL is referencing.
97 * maxlba is the maximum accessible LBA on the LUN. Note that this is
98 * different from the capacity of the array. capacity = maxlba + 1
100 * blocksize is the size, in bytes, of each LBA on the LUN. In general
101 * this should be 512. In theory CTL should be able to handle other block
102 * sizes. Host application software may not deal with it very well, though.
104 * pblockexp is the log2() of number of LBAs on the LUN per physical sector.
106 * pblockoff is the lowest LBA on the LUN aligned to physical sector.
108 * ublockexp is the log2() of number of LBAs on the LUN per UNMAP block.
110 * ublockoff is the lowest LBA on the LUN aligned to UNMAP block.
112 * atomicblock is the number of blocks that can be written atomically.
114 * opttxferlen is the number of blocks that can be written in one operation.
116 * req_lun_id is the requested LUN ID. CTL only pays attention to this
117 * field if the CTL_LUN_FLAG_ID_REQ flag is set. If the requested LUN ID is
118 * not available, the LUN addition will fail. If a particular LUN ID isn't
119 * requested, the first available LUN ID will be allocated.
121 * serial_num is the device serial number returned in the SCSI INQUIRY VPD
122 * page 0x80. This should be a unique, per-shelf value. The data inside
123 * this field should be ASCII only, left aligned, and any unused space
124 * should be padded out with ASCII spaces. This field should NOT be NULL
127 * device_id is the T10 device identifier returned in the SCSI INQUIRY VPD
128 * page 0x83. This should be a unique, per-LUN value. The data inside
129 * this field should be ASCII only, left aligned, and any unused space
130 * should be padded with ASCII spaces. This field should NOT be NULL
133 * The lun_shutdown() method is the callback for the ctl_remove_lun()
134 * call. It is called when all outstanding I/O for that LUN has been
135 * completed and CTL has deleted the resources for that LUN. When the CTL
136 * backend gets this call, it can safely free its per-LUN resources.
138 * The be field is a pointer to the ctl_backend_driver structure, which
139 * contains the backend methods to be called by CTL.
141 * The ctl_lun field is for CTL internal use only, and should not be used
144 * The links field is for CTL internal use only, and should not be used by
148 uint8_t lun_type; /* passed to CTL */
149 ctl_backend_lun_flags flags; /* passed to CTL */
150 ctl_lun_serseq serseq; /* passed to CTL */
151 uint64_t maxlba; /* passed to CTL */
152 uint32_t blocksize; /* passed to CTL */
153 uint16_t pblockexp; /* passed to CTL */
154 uint16_t pblockoff; /* passed to CTL */
155 uint16_t ublockexp; /* passed to CTL */
156 uint16_t ublockoff; /* passed to CTL */
157 uint32_t atomicblock; /* passed to CTL */
158 uint32_t opttxferlen; /* passed to CTL */
159 uint32_t req_lun_id; /* passed to CTL */
160 uint32_t lun_id; /* returned from CTL */
161 uint8_t serial_num[CTL_SN_LEN]; /* passed to CTL */
162 uint8_t device_id[CTL_DEVID_LEN];/* passed to CTL */
163 be_callback_t lun_shutdown; /* passed to CTL */
164 struct ctl_backend_driver *be; /* passed to CTL */
165 void *ctl_lun; /* used by CTL */
166 nvlist_t *options; /* passed to CTL */
167 STAILQ_ENTRY(ctl_be_lun) links; /* used by CTL */
171 CTL_BE_FLAG_NONE = 0x00, /* no flags */
172 CTL_BE_FLAG_HAS_CONFIG = 0x01, /* can do config reads, writes */
175 typedef int (*be_init_t)(void);
176 typedef int (*be_shutdown_t)(void);
177 typedef int (*be_func_t)(union ctl_io *io);
178 typedef void (*be_vfunc_t)(union ctl_io *io);
179 typedef int (*be_ioctl_t)(struct cdev *dev, u_long cmd, caddr_t addr, int flag,
181 typedef int (*be_luninfo_t)(struct ctl_be_lun *be_lun, struct sbuf *sb);
182 typedef uint64_t (*be_lunattr_t)(struct ctl_be_lun *be_lun, const char *attrname);
184 struct ctl_backend_driver {
185 char name[CTL_BE_NAME_LEN]; /* passed to CTL */
186 ctl_backend_flags flags; /* passed to CTL */
187 be_init_t init; /* passed to CTL */
188 be_shutdown_t shutdown; /* passed to CTL */
189 be_func_t data_submit; /* passed to CTL */
190 be_func_t config_read; /* passed to CTL */
191 be_func_t config_write; /* passed to CTL */
192 be_ioctl_t ioctl; /* passed to CTL */
193 be_luninfo_t lun_info; /* passed to CTL */
194 be_lunattr_t lun_attr; /* passed to CTL */
195 #ifdef CS_BE_CONFIG_MOVE_DONE_IS_NOT_USED
196 be_func_t config_move_done; /* passed to backend */
199 be_vfunc_t config_write_done; /* passed to backend */
201 STAILQ_ENTRY(ctl_backend_driver) links; /* used by CTL */
204 int ctl_backend_register(struct ctl_backend_driver *be);
205 int ctl_backend_deregister(struct ctl_backend_driver *be);
206 struct ctl_backend_driver *ctl_backend_find(char *backend_name);
209 * To add a LUN, call ctl_add_lun().
211 int ctl_add_lun(struct ctl_be_lun *be_lun);
214 * To remove a LUN, first call ctl_remove_lun().
215 * You will get the lun_shutdown() callback when all
216 * I/O to the LUN has completed and the LUN has been deleted.
218 int ctl_remove_lun(struct ctl_be_lun *be_lun);
221 * To start a LUN (transition from powered off to powered on state) call
222 * ctl_start_lun(). To stop a LUN (transition from powered on to powered
223 * off state) call ctl_stop_lun().
225 int ctl_start_lun(struct ctl_be_lun *be_lun);
226 int ctl_stop_lun(struct ctl_be_lun *be_lun);
229 * Methods to notify about media and tray status changes.
231 int ctl_lun_no_media(struct ctl_be_lun *be_lun);
232 int ctl_lun_has_media(struct ctl_be_lun *be_lun);
233 int ctl_lun_ejected(struct ctl_be_lun *be_lun);
236 * Called on LUN HA role change.
238 int ctl_lun_primary(struct ctl_be_lun *be_lun);
239 int ctl_lun_secondary(struct ctl_be_lun *be_lun);
242 * Let the backend notify the initiators about changes.
244 void ctl_lun_capacity_changed(struct ctl_be_lun *be_lun);
247 #endif /* _CTL_BACKEND_H_ */