1 /*- 2 * Data structures and definitions for dealing with the 3 * Common Access Method Transport (xpt) layer. 4 * 5 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD 6 * 7 * Copyright (c) 1997 Justin T. Gibbs. 8 * All rights reserved. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions, and the following disclaimer, 15 * without modification, immediately at the beginning of the file. 16 * 2. The name of the author may not be used to endorse or promote products 17 * derived from this software without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR 23 * ANY DIRECT, INDIRECT, INCIDENTAL, 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, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 * 31 * $FreeBSD$ 32 */ 33 34 #ifndef _CAM_CAM_XPT_H 35 #define _CAM_CAM_XPT_H 1 36 37 #ifdef _KERNEL 38 #include <sys/cdefs.h> 39 #include <cam/cam_ccb.h> 40 #endif 41 42 43 /* Forward Declarations */ 44 union ccb; 45 struct cam_periph; 46 struct cam_ed; 47 struct cam_sim; 48 struct sbuf; 49 50 /* 51 * Definition of a CAM path. Paths are created from bus, target, and lun ids 52 * via xpt_create_path and allow for reference to devices without recurring 53 * lookups in the edt. 54 */ 55 struct cam_path; 56 57 /* Path functions */ 58 59 #ifdef _KERNEL 60 61 /* 62 * Definition of an async handler callback block. These are used to add 63 * SIMs and peripherals to the async callback lists. 64 */ 65 struct async_node { 66 SLIST_ENTRY(async_node) links; 67 u_int32_t event_enable; /* Async Event enables */ 68 u_int32_t event_lock; /* Take SIM lock for handlers. */ 69 void (*callback)(void *arg, u_int32_t code, 70 struct cam_path *path, void *args); 71 void *callback_arg; 72 }; 73 74 SLIST_HEAD(async_list, async_node); 75 SLIST_HEAD(periph_list, cam_periph); 76 77 void xpt_action(union ccb *new_ccb); 78 void xpt_action_default(union ccb *new_ccb); 79 union ccb *xpt_alloc_ccb(void); 80 union ccb *xpt_alloc_ccb_nowait(void); 81 void xpt_free_ccb(union ccb *free_ccb); 82 void xpt_setup_ccb_flags(struct ccb_hdr *ccb_h, 83 struct cam_path *path, 84 u_int32_t priority, 85 u_int32_t flags); 86 void xpt_setup_ccb(struct ccb_hdr *ccb_h, 87 struct cam_path *path, 88 u_int32_t priority); 89 void xpt_merge_ccb(union ccb *master_ccb, 90 union ccb *slave_ccb); 91 cam_status xpt_create_path(struct cam_path **new_path_ptr, 92 struct cam_periph *perph, 93 path_id_t path_id, 94 target_id_t target_id, lun_id_t lun_id); 95 cam_status xpt_create_path_unlocked(struct cam_path **new_path_ptr, 96 struct cam_periph *perph, 97 path_id_t path_id, 98 target_id_t target_id, lun_id_t lun_id); 99 int xpt_getattr(char *buf, size_t len, const char *attr, 100 struct cam_path *path); 101 void xpt_free_path(struct cam_path *path); 102 void xpt_path_counts(struct cam_path *path, uint32_t *bus_ref, 103 uint32_t *periph_ref, uint32_t *target_ref, 104 uint32_t *device_ref); 105 int xpt_path_comp(struct cam_path *path1, 106 struct cam_path *path2); 107 int xpt_path_comp_dev(struct cam_path *path, 108 struct cam_ed *dev); 109 void xpt_print_path(struct cam_path *path); 110 void xpt_print_device(struct cam_ed *device); 111 void xpt_print(struct cam_path *path, const char *fmt, ...); 112 int xpt_path_string(struct cam_path *path, char *str, 113 size_t str_len); 114 int xpt_path_sbuf(struct cam_path *path, struct sbuf *sb); 115 path_id_t xpt_path_path_id(struct cam_path *path); 116 target_id_t xpt_path_target_id(struct cam_path *path); 117 lun_id_t xpt_path_lun_id(struct cam_path *path); 118 struct cam_sim *xpt_path_sim(struct cam_path *path); 119 struct cam_periph *xpt_path_periph(struct cam_path *path); 120 void xpt_async(u_int32_t async_code, struct cam_path *path, 121 void *async_arg); 122 void xpt_rescan(union ccb *ccb); 123 void xpt_hold_boot(void); 124 void xpt_release_boot(void); 125 void xpt_lock_buses(void); 126 void xpt_unlock_buses(void); 127 struct mtx * xpt_path_mtx(struct cam_path *path); 128 #define xpt_path_lock(path) mtx_lock(xpt_path_mtx(path)) 129 #define xpt_path_unlock(path) mtx_unlock(xpt_path_mtx(path)) 130 #define xpt_path_assert(path, what) mtx_assert(xpt_path_mtx(path), (what)) 131 #define xpt_path_owned(path) mtx_owned(xpt_path_mtx(path)) 132 #define xpt_path_sleep(path, chan, priority, wmesg, timo) \ 133 msleep((chan), xpt_path_mtx(path), (priority), (wmesg), (timo)) 134 cam_status xpt_register_async(int event, ac_callback_t *cbfunc, 135 void *cbarg, struct cam_path *path); 136 cam_status xpt_compile_path(struct cam_path *new_path, 137 struct cam_periph *perph, 138 path_id_t path_id, 139 target_id_t target_id, 140 lun_id_t lun_id); 141 cam_status xpt_clone_path(struct cam_path **new_path, 142 struct cam_path *path); 143 void xpt_copy_path(struct cam_path *new_path, 144 struct cam_path *path); 145 146 void xpt_release_path(struct cam_path *path); 147 148 const char * xpt_action_name(uint32_t action); 149 void xpt_pollwait(union ccb *start_ccb, uint32_t timeout); 150 uint32_t xpt_poll_setup(union ccb *start_ccb); 151 void xpt_sim_poll(struct cam_sim *sim); 152 153 /* 154 * Perform a path inquiry at the request priority. The bzero may be 155 * unnecessary. 156 */ 157 static inline void 158 xpt_path_inq(struct ccb_pathinq *cpi, struct cam_path *path) 159 { 160 161 bzero(cpi, sizeof(*cpi)); 162 xpt_setup_ccb(&cpi->ccb_h, path, CAM_PRIORITY_NORMAL); 163 cpi->ccb_h.func_code = XPT_PATH_INQ; 164 xpt_action((union ccb *)cpi); 165 } 166 167 #endif /* _KERNEL */ 168 169 #endif /* _CAM_CAM_XPT_H */ 170