ctl_backend.h revision 232604
1229997Sken/*- 2229997Sken * Copyright (c) 2003 Silicon Graphics International Corp. 3229997Sken * All rights reserved. 4229997Sken * 5229997Sken * Redistribution and use in source and binary forms, with or without 6229997Sken * modification, are permitted provided that the following conditions 7229997Sken * are met: 8229997Sken * 1. Redistributions of source code must retain the above copyright 9229997Sken * notice, this list of conditions, and the following disclaimer, 10229997Sken * without modification. 11229997Sken * 2. Redistributions in binary form must reproduce at minimum a disclaimer 12229997Sken * substantially similar to the "NO WARRANTY" disclaimer below 13229997Sken * ("Disclaimer") and any redistribution must be conditioned upon 14229997Sken * including a substantially similar Disclaimer requirement for further 15229997Sken * binary redistribution. 16229997Sken * 17229997Sken * NO WARRANTY 18229997Sken * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 19229997Sken * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 20229997Sken * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR 21229997Sken * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 22229997Sken * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 23229997Sken * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 24229997Sken * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 25229997Sken * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, 26229997Sken * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING 27229997Sken * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 28229997Sken * POSSIBILITY OF SUCH DAMAGES. 29229997Sken * 30229997Sken * $Id: //depot/users/kenm/FreeBSD-test2/sys/cam/ctl/ctl_backend.h#2 $ 31229997Sken * $FreeBSD: head/sys/cam/ctl/ctl_backend.h 232604 2012-03-06 13:43:57Z trasz $ 32229997Sken */ 33229997Sken/* 34229997Sken * CTL backend driver definitions 35229997Sken * 36229997Sken * Author: Ken Merry <ken@FreeBSD.org> 37229997Sken */ 38229997Sken 39229997Sken#ifndef _CTL_BACKEND_H_ 40229997Sken#define _CTL_BACKEND_H_ 41229997Sken 42229997Sken/* 43229997Sken * XXX KDM move this to another header file? 44229997Sken */ 45229997Sken#define CTL_BE_NAME_LEN 32 46229997Sken 47229997Sken/* 48229997Sken * The ID_REQ flag is used to say that the caller has requested a 49229997Sken * particular LUN ID in the req_lun_id field. If we cannot allocate that 50229997Sken * LUN ID, the ctl_add_lun() call will fail. 51229997Sken * 52229997Sken * The POWERED_OFF flag tells us that the LUN should default to the powered 53229997Sken * off state. It will return 0x04,0x02 until it is powered up. ("Logical 54229997Sken * unit not ready, initializing command required.") 55229997Sken * 56229997Sken * The INOPERABLE flag tells us that this LUN is not operable for whatever 57229997Sken * reason. This means that user data may have been (or has been?) lost. 58229997Sken * We will return 0x31,0x00 ("Medium format corrupted") until the host 59229997Sken * issues a FORMAT UNIT command to clear the error. 60229997Sken * 61229997Sken * The PRIMARY flag tells us that this LUN is registered as a Primary LUN 62229997Sken * which is accessible via the Master shelf controller in an HA. This flag 63229997Sken * being set indicates a Primary LUN. This flag being reset represents a 64229997Sken * Secondary LUN controlled by the Secondary controller in an HA 65229997Sken * configuration. Flag is applicable at this time to T_DIRECT types. 66229997Sken * 67229997Sken * The SERIAL_NUM flag tells us that the serial_num field is filled in and 68229997Sken * valid for use in SCSI INQUIRY VPD page 0x80. 69229997Sken * 70229997Sken * The DEVID flag tells us that the device_id field is filled in and 71229997Sken * valid for use in SCSI INQUIRY VPD page 0x83. 72229997Sken * 73229997Sken * The DEV_TYPE flag tells us that the device_type field is filled in. 74229997Sken */ 75229997Skentypedef enum { 76229997Sken CTL_LUN_FLAG_ID_REQ = 0x01, 77229997Sken CTL_LUN_FLAG_POWERED_OFF = 0x02, 78229997Sken CTL_LUN_FLAG_INOPERABLE = 0x04, 79229997Sken CTL_LUN_FLAG_PRIMARY = 0x08, 80229997Sken CTL_LUN_FLAG_SERIAL_NUM = 0x10, 81229997Sken CTL_LUN_FLAG_DEVID = 0x20, 82229997Sken CTL_LUN_FLAG_DEV_TYPE = 0x40 83229997Sken} ctl_backend_lun_flags; 84229997Sken 85229997Sken#ifdef _KERNEL 86229997Sken 87229997Sken#define CTL_BACKEND_DECLARE(name, driver) \ 88229997Sken static int name ## _modevent(module_t mod, int type, void *data) \ 89229997Sken { \ 90229997Sken switch (type) { \ 91229997Sken case MOD_LOAD: \ 92229997Sken ctl_backend_register( \ 93229997Sken (struct ctl_backend_driver *)data); \ 94229997Sken break; \ 95229997Sken case MOD_UNLOAD: \ 96229997Sken printf(#name " module unload - not possible for this module type\n"); \ 97229997Sken return EINVAL; \ 98229997Sken default: \ 99229997Sken return EOPNOTSUPP; \ 100229997Sken } \ 101229997Sken return 0; \ 102229997Sken } \ 103229997Sken static moduledata_t name ## _mod = { \ 104229997Sken #name, \ 105229997Sken name ## _modevent, \ 106229997Sken (void *)&driver \ 107229997Sken }; \ 108229997Sken DECLARE_MODULE(name, name ## _mod, SI_SUB_CONFIGURE, SI_ORDER_FOURTH); \ 109229997Sken MODULE_DEPEND(name, ctl, 1, 1, 1); \ 110229997Sken MODULE_DEPEND(name, cam, 1, 1, 1) 111229997Sken 112229997Sken 113229997Skentypedef enum { 114229997Sken CTL_LUN_CONFIG_OK, 115229997Sken CTL_LUN_CONFIG_FAILURE 116229997Sken} ctl_lun_config_status; 117229997Sken 118229997Skentypedef void (*be_callback_t)(void *be_lun); 119229997Skentypedef void (*be_lun_config_t)(void *be_lun, 120229997Sken ctl_lun_config_status status); 121229997Sken 122229997Sken/* 123229997Sken * The lun_type field is the SCSI device type of this particular LUN. In 124229997Sken * general, this should be T_DIRECT, although backends will want to create 125229997Sken * a processor LUN, typically at LUN 0. See scsi_all.h for the defines for 126229997Sken * the various SCSI device types. 127229997Sken * 128229997Sken * The flags are described above. 129229997Sken * 130229997Sken * The be_lun field is the backend driver's own context that will get 131229997Sken * passsed back so that it can tell which LUN CTL is referencing. 132229997Sken * 133229997Sken * maxlba is the maximum accessible LBA on the LUN. Note that this is 134229997Sken * different from the capacity of the array. capacity = maxlba + 1 135229997Sken * 136229997Sken * blocksize is the size, in bytes, of each LBA on the LUN. In general 137229997Sken * this should be 512. In theory CTL should be able to handle other block 138229997Sken * sizes. Host application software may not deal with it very well, though. 139229997Sken * 140229997Sken * req_lun_id is the requested LUN ID. CTL only pays attention to this 141229997Sken * field if the CTL_LUN_FLAG_ID_REQ flag is set. If the requested LUN ID is 142229997Sken * not available, the LUN addition will fail. If a particular LUN ID isn't 143229997Sken * requested, the first available LUN ID will be allocated. 144229997Sken * 145229997Sken * serial_num is the device serial number returned in the SCSI INQUIRY VPD 146229997Sken * page 0x80. This should be a unique, per-shelf value. The data inside 147229997Sken * this field should be ASCII only, left aligned, and any unused space 148229997Sken * should be padded out with ASCII spaces. This field should NOT be NULL 149229997Sken * terminated. 150229997Sken * 151229997Sken * device_id is the T10 device identifier returned in the SCSI INQUIRY VPD 152229997Sken * page 0x83. This should be a unique, per-LUN value. The data inside 153229997Sken * this field should be ASCII only, left aligned, and any unused space 154229997Sken * should be padded with ASCII spaces. This field should NOT be NULL 155229997Sken * terminated. 156229997Sken * 157229997Sken * The lun_shutdown() method is the callback for the ctl_invalidate_lun() 158229997Sken * call. It is called when all outstanding I/O for that LUN has been 159229997Sken * completed and CTL has deleted the resources for that LUN. When the CTL 160229997Sken * backend gets this call, it can safely free its per-LUN resources. 161229997Sken * 162229997Sken * The lun_config_status() method is the callback for the ctl_add_lun() 163229997Sken * call. It is called when the LUN is successfully added, or when LUN 164229997Sken * addition fails. If the LUN is successfully added, the backend may call 165229997Sken * the ctl_enable_lun() method to enable the LUN. 166229997Sken * 167229997Sken * The be field is a pointer to the ctl_backend_driver structure, which 168229997Sken * contains the backend methods to be called by CTL. 169229997Sken * 170229997Sken * The ctl_lun field is for CTL internal use only, and should not be used 171229997Sken * by the backend. 172229997Sken * 173229997Sken * The links field is for CTL internal use only, and should not be used by 174229997Sken * the backend. 175229997Sken */ 176229997Skenstruct ctl_be_lun { 177229997Sken uint8_t lun_type; /* passed to CTL */ 178229997Sken ctl_backend_lun_flags flags; /* passed to CTL */ 179229997Sken void *be_lun; /* passed to CTL */ 180229997Sken uint64_t maxlba; /* passed to CTL */ 181229997Sken uint32_t blocksize; /* passed to CTL */ 182229997Sken uint32_t req_lun_id; /* passed to CTL */ 183229997Sken uint32_t lun_id; /* returned from CTL */ 184229997Sken uint8_t serial_num[CTL_SN_LEN]; /* passed to CTL */ 185229997Sken uint8_t device_id[CTL_DEVID_LEN];/* passed to CTL */ 186229997Sken be_callback_t lun_shutdown; /* passed to CTL */ 187229997Sken be_lun_config_t lun_config_status; /* passed to CTL */ 188229997Sken struct ctl_backend_driver *be; /* passed to CTL */ 189229997Sken void *ctl_lun; /* used by CTL */ 190229997Sken STAILQ_ENTRY(ctl_be_lun) links; /* used by CTL */ 191229997Sken}; 192229997Sken 193229997Skentypedef enum { 194229997Sken CTL_BE_FLAG_NONE = 0x00, /* no flags */ 195229997Sken CTL_BE_FLAG_HAS_CONFIG = 0x01, /* can do config reads, writes */ 196229997Sken CTL_BE_FLAG_INTERNAL = 0x02 /* don't inc mod refcount */ 197229997Sken} ctl_backend_flags; 198229997Sken 199229997Skentypedef int (*be_init_t)(void); 200229997Skentypedef int (*be_func_t)(union ctl_io *io); 201229997Skentypedef void (*be_vfunc_t)(union ctl_io *io); 202229997Skentypedef int (*be_ioctl_t)(struct cdev *dev, u_long cmd, caddr_t addr, int flag, 203229997Sken struct thread *td); 204229997Skentypedef int (*be_luninfo_t)(void *be_lun, struct sbuf *sb); 205229997Sken 206229997Skenstruct ctl_backend_driver { 207229997Sken char name[CTL_BE_NAME_LEN]; /* passed to CTL */ 208229997Sken ctl_backend_flags flags; /* passed to CTL */ 209229997Sken be_init_t init; /* passed to CTL */ 210229997Sken be_func_t data_submit; /* passed to CTL */ 211229997Sken be_func_t data_move_done; /* passed to CTL */ 212229997Sken be_func_t config_read; /* passed to CTL */ 213229997Sken be_func_t config_write; /* passed to CTL */ 214229997Sken be_ioctl_t ioctl; /* passed to CTL */ 215229997Sken be_luninfo_t lun_info; /* passed to CTL */ 216229997Sken#ifdef CS_BE_CONFIG_MOVE_DONE_IS_NOT_USED 217229997Sken be_func_t config_move_done; /* passed to backend */ 218229997Sken#endif 219229997Sken#if 0 220229997Sken be_vfunc_t config_write_done; /* passed to backend */ 221229997Sken#endif 222229997Sken u_int num_luns; /* used by CTL */ 223229997Sken STAILQ_ENTRY(ctl_backend_driver) links; /* used by CTL */ 224229997Sken}; 225229997Sken 226229997Skenint ctl_backend_register(struct ctl_backend_driver *be); 227229997Skenint ctl_backend_deregister(struct ctl_backend_driver *be); 228229997Skenstruct ctl_backend_driver *ctl_backend_find(char *backend_name); 229229997Sken 230229997Sken/* 231229997Sken * To add a LUN, first call ctl_add_lun(). You will get the lun_config_status() 232229997Sken * callback when the LUN addition has either succeeded or failed. 233229997Sken * 234229997Sken * Once you get that callback, you can then call ctl_enable_lun() to enable 235229997Sken * the LUN. 236229997Sken */ 237229997Skenint ctl_add_lun(struct ctl_be_lun *be_lun); 238229997Skenint ctl_enable_lun(struct ctl_be_lun *be_lun); 239229997Sken 240229997Sken/* 241229997Sken * To delete a LUN, first call ctl_disable_lun(), then 242229997Sken * ctl_invalidate_lun(). You will get the lun_shutdown() callback when all 243229997Sken * I/O to the LUN has completed and the LUN has been deleted. 244229997Sken */ 245229997Skenint ctl_disable_lun(struct ctl_be_lun *be_lun); 246229997Skenint ctl_invalidate_lun(struct ctl_be_lun *be_lun); 247229997Sken 248229997Sken/* 249229997Sken * To start a LUN (transition from powered off to powered on state) call 250229997Sken * ctl_start_lun(). To stop a LUN (transition from powered on to powered 251229997Sken * off state) call ctl_stop_lun(). 252229997Sken */ 253229997Skenint ctl_start_lun(struct ctl_be_lun *be_lun); 254229997Skenint ctl_stop_lun(struct ctl_be_lun *be_lun); 255229997Sken 256229997Sken/* 257229997Sken * If a LUN is inoperable, call ctl_lun_inoperable(). Generally the LUN 258229997Sken * will become operable once again when the user issues the SCSI FORMAT UNIT 259229997Sken * command. (CTL will automatically clear the inoperable flag.) If we 260229997Sken * need to re-enable the LUN, we can call ctl_lun_operable() to enable it 261229997Sken * without a SCSI command. 262229997Sken */ 263229997Skenint ctl_lun_inoperable(struct ctl_be_lun *be_lun); 264229997Skenint ctl_lun_operable(struct ctl_be_lun *be_lun); 265229997Sken 266229997Sken/* 267229997Sken * If a LUN is locked on or unlocked from a power/APS standpoint, call 268229997Sken * ctl_lun_power_lock() to update the current status in CTL's APS subpage. 269229997Sken * Set the lock flag to 1 to lock the LUN, set it to 0 to unlock the LUN. 270229997Sken */ 271229997Skenint ctl_lun_power_lock(struct ctl_be_lun *be_lun, struct ctl_nexus *nexus, 272229997Sken int lock); 273229997Sken 274229997Sken/* 275229997Sken * To take a LUN offline, call ctl_lun_offline(). Generally the LUN will 276229997Sken * be online again once the user sends a SCSI START STOP UNIT command with 277229997Sken * the start and on/offline bits set. The backend can bring the LUN back 278229997Sken * online via the ctl_lun_online() function, if necessary. 279229997Sken */ 280229997Skenint ctl_lun_offline(struct ctl_be_lun *be_lun); 281229997Skenint ctl_lun_online(struct ctl_be_lun *be_lun); 282229997Sken 283232604Strasz/* 284232604Strasz * Let the backend notify the initiator about changed capacity. 285232604Strasz */ 286232604Straszvoid ctl_lun_capacity_changed(struct ctl_be_lun *be_lun); 287232604Strasz 288229997Sken#endif /* _KERNEL */ 289229997Sken#endif /* _CTL_BACKEND_H_ */ 290229997Sken 291229997Sken/* 292229997Sken * vim: ts=8 293229997Sken */ 294