1 /*- 2 * Copyright (c) 2003 Silicon Graphics International Corp. 3 * Copyright (c) 2014-2015 Alexander Motin <mav@FreeBSD.org> 4 * All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions, and the following disclaimer, 11 * without modification. 12 * 2. Redistributions in binary form must reproduce at minimum a disclaimer 13 * substantially similar to the "NO WARRANTY" disclaimer below 14 * ("Disclaimer") and any redistribution must be conditioned upon 15 * including a substantially similar Disclaimer requirement for further 16 * binary redistribution. 17 * 18 * NO WARRANTY 19 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 20 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 21 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR 22 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 23 * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, 27 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING 28 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 29 * POSSIBILITY OF SUCH DAMAGES. 30 * 31 * $Id: //depot/users/kenm/FreeBSD-test2/sys/cam/ctl/ctl_backend.h#2 $ 32 * $FreeBSD$ 33 */ 34 /* 35 * CTL backend driver definitions 36 * 37 * Author: Ken Merry <ken@FreeBSD.org> 38 */ 39 40 #ifndef _CTL_BACKEND_H_ 41 #define _CTL_BACKEND_H_ 42 43 /* 44 * XXX KDM move this to another header file? 45 */ 46 #define CTL_BE_NAME_LEN 32 47 48 /* 49 * The ID_REQ flag is used to say that the caller has requested a 50 * particular LUN ID in the req_lun_id field. If we cannot allocate that 51 * LUN ID, the ctl_add_lun() call will fail. 52 * 53 * The STOPPED flag tells us that the LUN should default to the powered 54 * off state. It will return 0x04,0x02 until it is powered up. ("Logical 55 * unit not ready, initializing command required.") 56 * 57 * The NO_MEDIA flag tells us that the LUN has no media inserted. 58 * 59 * The PRIMARY flag tells us that this LUN is registered as a Primary LUN 60 * which is accessible via the Master shelf controller in an HA. This flag 61 * being set indicates a Primary LUN. This flag being reset represents a 62 * Secondary LUN controlled by the Secondary controller in an HA 63 * configuration. Flag is applicable at this time to T_DIRECT types. 64 * 65 * The SERIAL_NUM flag tells us that the serial_num field is filled in and 66 * valid for use in SCSI INQUIRY VPD page 0x80. 67 * 68 * The DEVID flag tells us that the device_id field is filled in and 69 * valid for use in SCSI INQUIRY VPD page 0x83. 70 * 71 * The DEV_TYPE flag tells us that the device_type field is filled in. 72 * 73 * The EJECTED flag tells us that the removable LUN has tray open. 74 * 75 * The UNMAP flag tells us that this LUN supports UNMAP. 76 * 77 * The OFFLINE flag tells us that this LUN can not access backing store. 78 */ 79 typedef enum { 80 CTL_LUN_FLAG_ID_REQ = 0x01, 81 CTL_LUN_FLAG_STOPPED = 0x02, 82 CTL_LUN_FLAG_NO_MEDIA = 0x04, 83 CTL_LUN_FLAG_PRIMARY = 0x08, 84 CTL_LUN_FLAG_SERIAL_NUM = 0x10, 85 CTL_LUN_FLAG_DEVID = 0x20, 86 CTL_LUN_FLAG_DEV_TYPE = 0x40, 87 CTL_LUN_FLAG_UNMAP = 0x80, 88 CTL_LUN_FLAG_EJECTED = 0x100, 89 CTL_LUN_FLAG_READONLY = 0x200 90 } ctl_backend_lun_flags; 91 92 typedef enum { 93 CTL_LUN_SERSEQ_OFF, 94 CTL_LUN_SERSEQ_READ, 95 CTL_LUN_SERSEQ_ON 96 } ctl_lun_serseq; 97 98 #ifdef _KERNEL 99 100 #define CTL_BACKEND_DECLARE(name, driver) \ 101 static int name ## _modevent(module_t mod, int type, void *data) \ 102 { \ 103 switch (type) { \ 104 case MOD_LOAD: \ 105 ctl_backend_register( \ 106 (struct ctl_backend_driver *)data); \ 107 break; \ 108 case MOD_UNLOAD: \ 109 printf(#name " module unload - not possible for this module type\n"); \ 110 return EINVAL; \ 111 default: \ 112 return EOPNOTSUPP; \ 113 } \ 114 return 0; \ 115 } \ 116 static moduledata_t name ## _mod = { \ 117 #name, \ 118 name ## _modevent, \ 119 (void *)&driver \ 120 }; \ 121 DECLARE_MODULE(name, name ## _mod, SI_SUB_CONFIGURE, SI_ORDER_FOURTH); \ 122 MODULE_DEPEND(name, ctl, 1, 1, 1); \ 123 MODULE_DEPEND(name, cam, 1, 1, 1) 124 125 126 typedef enum { 127 CTL_LUN_CONFIG_OK, 128 CTL_LUN_CONFIG_FAILURE 129 } ctl_lun_config_status; 130 131 typedef void (*be_callback_t)(void *be_lun); 132 typedef void (*be_lun_config_t)(void *be_lun, 133 ctl_lun_config_status status); 134 135 /* 136 * The lun_type field is the SCSI device type of this particular LUN. In 137 * general, this should be T_DIRECT, although backends will want to create 138 * a processor LUN, typically at LUN 0. See scsi_all.h for the defines for 139 * the various SCSI device types. 140 * 141 * The flags are described above. 142 * 143 * The be_lun field is the backend driver's own context that will get 144 * passsed back so that it can tell which LUN CTL is referencing. 145 * 146 * maxlba is the maximum accessible LBA on the LUN. Note that this is 147 * different from the capacity of the array. capacity = maxlba + 1 148 * 149 * blocksize is the size, in bytes, of each LBA on the LUN. In general 150 * this should be 512. In theory CTL should be able to handle other block 151 * sizes. Host application software may not deal with it very well, though. 152 * 153 * pblockexp is the log2() of number of LBAs on the LUN per physical sector. 154 * 155 * pblockoff is the lowest LBA on the LUN aligned to physical sector. 156 * 157 * ublockexp is the log2() of number of LBAs on the LUN per UNMAP block. 158 * 159 * ublockoff is the lowest LBA on the LUN aligned to UNMAP block. 160 * 161 * atomicblock is the number of blocks that can be written atomically. 162 * 163 * opttxferlen is the number of blocks that can be written in one operation. 164 * 165 * req_lun_id is the requested LUN ID. CTL only pays attention to this 166 * field if the CTL_LUN_FLAG_ID_REQ flag is set. If the requested LUN ID is 167 * not available, the LUN addition will fail. If a particular LUN ID isn't 168 * requested, the first available LUN ID will be allocated. 169 * 170 * serial_num is the device serial number returned in the SCSI INQUIRY VPD 171 * page 0x80. This should be a unique, per-shelf value. The data inside 172 * this field should be ASCII only, left aligned, and any unused space 173 * should be padded out with ASCII spaces. This field should NOT be NULL 174 * terminated. 175 * 176 * device_id is the T10 device identifier returned in the SCSI INQUIRY VPD 177 * page 0x83. This should be a unique, per-LUN value. The data inside 178 * this field should be ASCII only, left aligned, and any unused space 179 * should be padded with ASCII spaces. This field should NOT be NULL 180 * terminated. 181 * 182 * The lun_shutdown() method is the callback for the ctl_invalidate_lun() 183 * call. It is called when all outstanding I/O for that LUN has been 184 * completed and CTL has deleted the resources for that LUN. When the CTL 185 * backend gets this call, it can safely free its per-LUN resources. 186 * 187 * The lun_config_status() method is the callback for the ctl_add_lun() 188 * call. It is called when the LUN is successfully added, or when LUN 189 * addition fails. If the LUN is successfully added, the backend may call 190 * the ctl_enable_lun() method to enable the LUN. 191 * 192 * The be field is a pointer to the ctl_backend_driver structure, which 193 * contains the backend methods to be called by CTL. 194 * 195 * The ctl_lun field is for CTL internal use only, and should not be used 196 * by the backend. 197 * 198 * The links field is for CTL internal use only, and should not be used by 199 * the backend. 200 */ 201 struct ctl_be_lun { 202 uint8_t lun_type; /* passed to CTL */ 203 ctl_backend_lun_flags flags; /* passed to CTL */ 204 ctl_lun_serseq serseq; /* passed to CTL */ 205 void *be_lun; /* passed to CTL */ 206 uint64_t maxlba; /* passed to CTL */ 207 uint32_t blocksize; /* passed to CTL */ 208 uint16_t pblockexp; /* passed to CTL */ 209 uint16_t pblockoff; /* passed to CTL */ 210 uint16_t ublockexp; /* passed to CTL */ 211 uint16_t ublockoff; /* passed to CTL */ 212 uint32_t atomicblock; /* passed to CTL */ 213 uint32_t opttxferlen; /* passed to CTL */ 214 uint32_t req_lun_id; /* passed to CTL */ 215 uint32_t lun_id; /* returned from CTL */ 216 uint8_t serial_num[CTL_SN_LEN]; /* passed to CTL */ 217 uint8_t device_id[CTL_DEVID_LEN];/* passed to CTL */ 218 be_callback_t lun_shutdown; /* passed to CTL */ 219 be_lun_config_t lun_config_status; /* passed to CTL */ 220 struct ctl_backend_driver *be; /* passed to CTL */ 221 void *ctl_lun; /* used by CTL */ 222 ctl_options_t options; /* passed to CTL */ 223 STAILQ_ENTRY(ctl_be_lun) links; /* used by CTL */ 224 }; 225 226 typedef enum { 227 CTL_BE_FLAG_NONE = 0x00, /* no flags */ 228 CTL_BE_FLAG_HAS_CONFIG = 0x01, /* can do config reads, writes */ 229 CTL_BE_FLAG_INTERNAL = 0x02 /* don't inc mod refcount */ 230 } ctl_backend_flags; 231 232 typedef int (*be_init_t)(void); 233 typedef int (*be_func_t)(union ctl_io *io); 234 typedef void (*be_vfunc_t)(union ctl_io *io); 235 typedef int (*be_ioctl_t)(struct cdev *dev, u_long cmd, caddr_t addr, int flag, 236 struct thread *td); 237 typedef int (*be_luninfo_t)(void *be_lun, struct sbuf *sb); 238 typedef uint64_t (*be_lunattr_t)(void *be_lun, const char *attrname); 239 240 struct ctl_backend_driver { 241 char name[CTL_BE_NAME_LEN]; /* passed to CTL */ 242 ctl_backend_flags flags; /* passed to CTL */ 243 be_init_t init; /* passed to CTL */ 244 be_func_t data_submit; /* passed to CTL */ 245 be_func_t data_move_done; /* passed to CTL */ 246 be_func_t config_read; /* passed to CTL */ 247 be_func_t config_write; /* passed to CTL */ 248 be_ioctl_t ioctl; /* passed to CTL */ 249 be_luninfo_t lun_info; /* passed to CTL */ 250 be_lunattr_t lun_attr; /* passed to CTL */ 251 #ifdef CS_BE_CONFIG_MOVE_DONE_IS_NOT_USED 252 be_func_t config_move_done; /* passed to backend */ 253 #endif 254 #if 0 255 be_vfunc_t config_write_done; /* passed to backend */ 256 #endif 257 u_int num_luns; /* used by CTL */ 258 STAILQ_ENTRY(ctl_backend_driver) links; /* used by CTL */ 259 }; 260 261 int ctl_backend_register(struct ctl_backend_driver *be); 262 int ctl_backend_deregister(struct ctl_backend_driver *be); 263 struct ctl_backend_driver *ctl_backend_find(char *backend_name); 264 265 /* 266 * To add a LUN, first call ctl_add_lun(). You will get the lun_config_status() 267 * callback when the LUN addition has either succeeded or failed. 268 * 269 * Once you get that callback, you can then call ctl_enable_lun() to enable 270 * the LUN. 271 */ 272 int ctl_add_lun(struct ctl_be_lun *be_lun); 273 int ctl_enable_lun(struct ctl_be_lun *be_lun); 274 275 /* 276 * To delete a LUN, first call ctl_disable_lun(), then 277 * ctl_invalidate_lun(). You will get the lun_shutdown() callback when all 278 * I/O to the LUN has completed and the LUN has been deleted. 279 */ 280 int ctl_disable_lun(struct ctl_be_lun *be_lun); 281 int ctl_invalidate_lun(struct ctl_be_lun *be_lun); 282 283 /* 284 * To start a LUN (transition from powered off to powered on state) call 285 * ctl_start_lun(). To stop a LUN (transition from powered on to powered 286 * off state) call ctl_stop_lun(). 287 */ 288 int ctl_start_lun(struct ctl_be_lun *be_lun); 289 int ctl_stop_lun(struct ctl_be_lun *be_lun); 290 291 /* 292 * Methods to notify about media and tray status changes. 293 */ 294 int ctl_lun_no_media(struct ctl_be_lun *be_lun); 295 int ctl_lun_has_media(struct ctl_be_lun *be_lun); 296 int ctl_lun_ejected(struct ctl_be_lun *be_lun); 297 298 /* 299 * Called on LUN HA role change. 300 */ 301 int ctl_lun_primary(struct ctl_be_lun *be_lun); 302 int ctl_lun_secondary(struct ctl_be_lun *be_lun); 303 304 /* 305 * Let the backend notify the initiators about changes. 306 */ 307 void ctl_lun_capacity_changed(struct ctl_be_lun *be_lun); 308 309 #endif /* _KERNEL */ 310 #endif /* _CTL_BACKEND_H_ */ 311 312 /* 313 * vim: ts=8 314 */ 315