1229997Sken/*- 2229997Sken * Copyright (c) 2003 Silicon Graphics International Corp. 3312840Smav * Copyright (c) 2014-2017 Alexander Motin <mav@FreeBSD.org> 4229997Sken * All rights reserved. 5229997Sken * 6229997Sken * Redistribution and use in source and binary forms, with or without 7229997Sken * modification, are permitted provided that the following conditions 8229997Sken * are met: 9229997Sken * 1. Redistributions of source code must retain the above copyright 10229997Sken * notice, this list of conditions, and the following disclaimer, 11229997Sken * without modification. 12229997Sken * 2. Redistributions in binary form must reproduce at minimum a disclaimer 13229997Sken * substantially similar to the "NO WARRANTY" disclaimer below 14229997Sken * ("Disclaimer") and any redistribution must be conditioned upon 15229997Sken * including a substantially similar Disclaimer requirement for further 16229997Sken * binary redistribution. 17229997Sken * 18229997Sken * NO WARRANTY 19229997Sken * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 20229997Sken * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 21229997Sken * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR 22229997Sken * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 23229997Sken * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24229997Sken * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25229997Sken * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26229997Sken * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, 27229997Sken * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING 28229997Sken * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 29229997Sken * POSSIBILITY OF SUCH DAMAGES. 30229997Sken * 31229997Sken * $Id: //depot/users/kenm/FreeBSD-test2/sys/cam/ctl/ctl_backend.h#2 $ 32229997Sken * $FreeBSD: stable/11/sys/cam/ctl/ctl_backend.h 361256 2020-05-19 14:42:09Z mav $ 33229997Sken */ 34229997Sken/* 35229997Sken * CTL backend driver definitions 36229997Sken * 37229997Sken * Author: Ken Merry <ken@FreeBSD.org> 38229997Sken */ 39229997Sken 40229997Sken#ifndef _CTL_BACKEND_H_ 41229997Sken#define _CTL_BACKEND_H_ 42229997Sken 43312840Smav#include <cam/ctl/ctl_ioctl.h> 44229997Sken 45229997Skentypedef enum { 46287499Smav CTL_LUN_SERSEQ_OFF, 47287499Smav CTL_LUN_SERSEQ_READ, 48287499Smav CTL_LUN_SERSEQ_ON 49287499Smav} ctl_lun_serseq; 50287499Smav 51229997Sken#ifdef _KERNEL 52229997Sken 53229997Sken#define CTL_BACKEND_DECLARE(name, driver) \ 54229997Sken static int name ## _modevent(module_t mod, int type, void *data) \ 55229997Sken { \ 56229997Sken switch (type) { \ 57229997Sken case MOD_LOAD: \ 58313368Smav return (ctl_backend_register( \ 59313368Smav (struct ctl_backend_driver *)data)); \ 60229997Sken break; \ 61229997Sken case MOD_UNLOAD: \ 62313368Smav return (ctl_backend_deregister( \ 63313368Smav (struct ctl_backend_driver *)data)); \ 64313368Smav break; \ 65229997Sken default: \ 66229997Sken return EOPNOTSUPP; \ 67229997Sken } \ 68229997Sken return 0; \ 69229997Sken } \ 70229997Sken static moduledata_t name ## _mod = { \ 71229997Sken #name, \ 72229997Sken name ## _modevent, \ 73229997Sken (void *)&driver \ 74229997Sken }; \ 75229997Sken DECLARE_MODULE(name, name ## _mod, SI_SUB_CONFIGURE, SI_ORDER_FOURTH); \ 76229997Sken MODULE_DEPEND(name, ctl, 1, 1, 1); \ 77229997Sken MODULE_DEPEND(name, cam, 1, 1, 1) 78229997Sken 79229997Sken 80229997Skentypedef void (*be_callback_t)(void *be_lun); 81229997Sken 82229997Sken/* 83229997Sken * The lun_type field is the SCSI device type of this particular LUN. In 84229997Sken * general, this should be T_DIRECT, although backends will want to create 85229997Sken * a processor LUN, typically at LUN 0. See scsi_all.h for the defines for 86229997Sken * the various SCSI device types. 87229997Sken * 88229997Sken * The flags are described above. 89229997Sken * 90229997Sken * The be_lun field is the backend driver's own context that will get 91229997Sken * passsed back so that it can tell which LUN CTL is referencing. 92229997Sken * 93229997Sken * maxlba is the maximum accessible LBA on the LUN. Note that this is 94229997Sken * different from the capacity of the array. capacity = maxlba + 1 95229997Sken * 96229997Sken * blocksize is the size, in bytes, of each LBA on the LUN. In general 97229997Sken * this should be 512. In theory CTL should be able to handle other block 98229997Sken * sizes. Host application software may not deal with it very well, though. 99229997Sken * 100264191Smav * pblockexp is the log2() of number of LBAs on the LUN per physical sector. 101264191Smav * 102275920Smav * pblockoff is the lowest LBA on the LUN aligned to physical sector. 103264191Smav * 104275920Smav * ublockexp is the log2() of number of LBAs on the LUN per UNMAP block. 105275920Smav * 106275920Smav * ublockoff is the lowest LBA on the LUN aligned to UNMAP block. 107275920Smav * 108272734Smav * atomicblock is the number of blocks that can be written atomically. 109272734Smav * 110275920Smav * opttxferlen is the number of blocks that can be written in one operation. 111275920Smav * 112229997Sken * req_lun_id is the requested LUN ID. CTL only pays attention to this 113229997Sken * field if the CTL_LUN_FLAG_ID_REQ flag is set. If the requested LUN ID is 114229997Sken * not available, the LUN addition will fail. If a particular LUN ID isn't 115229997Sken * requested, the first available LUN ID will be allocated. 116229997Sken * 117229997Sken * serial_num is the device serial number returned in the SCSI INQUIRY VPD 118229997Sken * page 0x80. This should be a unique, per-shelf value. The data inside 119229997Sken * this field should be ASCII only, left aligned, and any unused space 120229997Sken * should be padded out with ASCII spaces. This field should NOT be NULL 121229997Sken * terminated. 122229997Sken * 123229997Sken * device_id is the T10 device identifier returned in the SCSI INQUIRY VPD 124229997Sken * page 0x83. This should be a unique, per-LUN value. The data inside 125229997Sken * this field should be ASCII only, left aligned, and any unused space 126229997Sken * should be padded with ASCII spaces. This field should NOT be NULL 127229997Sken * terminated. 128229997Sken * 129361256Smav * The lun_shutdown() method is the callback for the ctl_remove_lun() 130229997Sken * call. It is called when all outstanding I/O for that LUN has been 131229997Sken * completed and CTL has deleted the resources for that LUN. When the CTL 132229997Sken * backend gets this call, it can safely free its per-LUN resources. 133229997Sken * 134229997Sken * The be field is a pointer to the ctl_backend_driver structure, which 135229997Sken * contains the backend methods to be called by CTL. 136229997Sken * 137229997Sken * The ctl_lun field is for CTL internal use only, and should not be used 138229997Sken * by the backend. 139229997Sken * 140229997Sken * The links field is for CTL internal use only, and should not be used by 141229997Sken * the backend. 142229997Sken */ 143229997Skenstruct ctl_be_lun { 144229997Sken uint8_t lun_type; /* passed to CTL */ 145229997Sken ctl_backend_lun_flags flags; /* passed to CTL */ 146287499Smav ctl_lun_serseq serseq; /* passed to CTL */ 147229997Sken void *be_lun; /* passed to CTL */ 148229997Sken uint64_t maxlba; /* passed to CTL */ 149229997Sken uint32_t blocksize; /* passed to CTL */ 150264191Smav uint16_t pblockexp; /* passed to CTL */ 151264191Smav uint16_t pblockoff; /* passed to CTL */ 152275865Smav uint16_t ublockexp; /* passed to CTL */ 153275865Smav uint16_t ublockoff; /* passed to CTL */ 154272734Smav uint32_t atomicblock; /* passed to CTL */ 155275920Smav uint32_t opttxferlen; /* passed to CTL */ 156229997Sken uint32_t req_lun_id; /* passed to CTL */ 157229997Sken uint32_t lun_id; /* returned from CTL */ 158229997Sken uint8_t serial_num[CTL_SN_LEN]; /* passed to CTL */ 159229997Sken uint8_t device_id[CTL_DEVID_LEN];/* passed to CTL */ 160229997Sken be_callback_t lun_shutdown; /* passed to CTL */ 161229997Sken struct ctl_backend_driver *be; /* passed to CTL */ 162229997Sken void *ctl_lun; /* used by CTL */ 163268280Smav ctl_options_t options; /* passed to CTL */ 164229997Sken STAILQ_ENTRY(ctl_be_lun) links; /* used by CTL */ 165229997Sken}; 166229997Sken 167229997Skentypedef enum { 168229997Sken CTL_BE_FLAG_NONE = 0x00, /* no flags */ 169229997Sken CTL_BE_FLAG_HAS_CONFIG = 0x01, /* can do config reads, writes */ 170229997Sken} ctl_backend_flags; 171229997Sken 172229997Skentypedef int (*be_init_t)(void); 173313368Smavtypedef int (*be_shutdown_t)(void); 174229997Skentypedef int (*be_func_t)(union ctl_io *io); 175229997Skentypedef void (*be_vfunc_t)(union ctl_io *io); 176229997Skentypedef int (*be_ioctl_t)(struct cdev *dev, u_long cmd, caddr_t addr, int flag, 177229997Sken struct thread *td); 178229997Skentypedef int (*be_luninfo_t)(void *be_lun, struct sbuf *sb); 179274154Smavtypedef uint64_t (*be_lunattr_t)(void *be_lun, const char *attrname); 180229997Sken 181229997Skenstruct ctl_backend_driver { 182229997Sken char name[CTL_BE_NAME_LEN]; /* passed to CTL */ 183229997Sken ctl_backend_flags flags; /* passed to CTL */ 184229997Sken be_init_t init; /* passed to CTL */ 185313368Smav be_shutdown_t shutdown; /* passed to CTL */ 186229997Sken be_func_t data_submit; /* passed to CTL */ 187229997Sken be_func_t data_move_done; /* passed to CTL */ 188229997Sken be_func_t config_read; /* passed to CTL */ 189229997Sken be_func_t config_write; /* passed to CTL */ 190229997Sken be_ioctl_t ioctl; /* passed to CTL */ 191229997Sken be_luninfo_t lun_info; /* passed to CTL */ 192274154Smav be_lunattr_t lun_attr; /* passed to CTL */ 193229997Sken#ifdef CS_BE_CONFIG_MOVE_DONE_IS_NOT_USED 194229997Sken be_func_t config_move_done; /* passed to backend */ 195229997Sken#endif 196229997Sken#if 0 197229997Sken be_vfunc_t config_write_done; /* passed to backend */ 198229997Sken#endif 199229997Sken STAILQ_ENTRY(ctl_backend_driver) links; /* used by CTL */ 200229997Sken}; 201229997Sken 202229997Skenint ctl_backend_register(struct ctl_backend_driver *be); 203229997Skenint ctl_backend_deregister(struct ctl_backend_driver *be); 204229997Skenstruct ctl_backend_driver *ctl_backend_find(char *backend_name); 205229997Sken 206229997Sken/* 207361256Smav * To add a LUN, call ctl_add_lun(). 208229997Sken */ 209229997Skenint ctl_add_lun(struct ctl_be_lun *be_lun); 210229997Sken 211229997Sken/* 212361256Smav * To remove a LUN, first call ctl_remove_lun(). 213361256Smav * You will get the lun_shutdown() callback when all 214229997Sken * I/O to the LUN has completed and the LUN has been deleted. 215229997Sken */ 216361256Smavint ctl_remove_lun(struct ctl_be_lun *be_lun); 217229997Sken 218229997Sken/* 219229997Sken * To start a LUN (transition from powered off to powered on state) call 220229997Sken * ctl_start_lun(). To stop a LUN (transition from powered on to powered 221229997Sken * off state) call ctl_stop_lun(). 222229997Sken */ 223229997Skenint ctl_start_lun(struct ctl_be_lun *be_lun); 224229997Skenint ctl_stop_lun(struct ctl_be_lun *be_lun); 225229997Sken 226229997Sken/* 227288348Smav * Methods to notify about media and tray status changes. 228229997Sken */ 229288348Smavint ctl_lun_no_media(struct ctl_be_lun *be_lun); 230288348Smavint ctl_lun_has_media(struct ctl_be_lun *be_lun); 231288348Smavint ctl_lun_ejected(struct ctl_be_lun *be_lun); 232229997Sken 233229997Sken/* 234287621Smav * Called on LUN HA role change. 235287621Smav */ 236287621Smavint ctl_lun_primary(struct ctl_be_lun *be_lun); 237287621Smavint ctl_lun_secondary(struct ctl_be_lun *be_lun); 238287621Smav 239287621Smav/* 240288348Smav * Let the backend notify the initiators about changes. 241232604Strasz */ 242232604Straszvoid ctl_lun_capacity_changed(struct ctl_be_lun *be_lun); 243232604Strasz 244229997Sken#endif /* _KERNEL */ 245229997Sken#endif /* _CTL_BACKEND_H_ */ 246229997Sken 247229997Sken/* 248229997Sken * vim: ts=8 249229997Sken */ 250