1 /*- 2 * Data structures and definitions for CAM peripheral ("type") drivers. 3 * 4 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD 5 * 6 * Copyright (c) 1997, 1998 Justin T. Gibbs. 7 * All rights reserved. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions, and the following disclaimer, 14 * without modification, immediately at the beginning of the file. 15 * 2. The name of the author may not be used to endorse or promote products 16 * derived from this software without specific prior written permission. 17 * 18 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 19 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 21 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR 22 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 24 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 25 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 26 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 27 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 28 * SUCH DAMAGE. 29 * 30 * $FreeBSD$ 31 */ 32 33 #ifndef _CAM_CAM_PERIPH_H 34 #define _CAM_CAM_PERIPH_H 1 35 36 #include <sys/queue.h> 37 #include <cam/cam_sim.h> 38 39 #ifdef _KERNEL 40 #include <sys/sysctl.h> 41 #include <sys/taskqueue.h> 42 43 #include <cam/cam_xpt.h> 44 45 struct devstat; 46 47 extern struct cam_periph *xpt_periph; 48 49 extern struct periph_driver **periph_drivers; 50 void periphdriver_register(void *); 51 int periphdriver_unregister(void *); 52 void periphdriver_init(int level); 53 54 #include <sys/module.h> 55 #define PERIPHDRIVER_DECLARE(name, driver) \ 56 static int name ## _modevent(module_t mod, int type, void *data) \ 57 { \ 58 switch (type) { \ 59 case MOD_LOAD: \ 60 periphdriver_register(data); \ 61 break; \ 62 case MOD_UNLOAD: \ 63 return (periphdriver_unregister(data)); \ 64 default: \ 65 return EOPNOTSUPP; \ 66 } \ 67 return 0; \ 68 } \ 69 static moduledata_t name ## _mod = { \ 70 #name, \ 71 name ## _modevent, \ 72 (void *)&driver \ 73 }; \ 74 DECLARE_MODULE(name, name ## _mod, SI_SUB_DRIVERS, SI_ORDER_ANY); \ 75 MODULE_DEPEND(name, cam, 1, 1, 1) 76 77 /* 78 * Callback informing the peripheral driver it can perform it's 79 * initialization since the XPT is now fully initialized. 80 */ 81 typedef void (periph_init_t)(void); 82 83 /* 84 * Callback requesting the peripheral driver to remove its instances 85 * and shutdown, if possible. 86 */ 87 typedef int (periph_deinit_t)(void); 88 89 struct periph_driver { 90 periph_init_t *init; 91 char *driver_name; 92 TAILQ_HEAD(,cam_periph) units; 93 u_int generation; 94 u_int flags; 95 #define CAM_PERIPH_DRV_EARLY 0x01 96 periph_deinit_t *deinit; 97 }; 98 99 typedef enum { 100 CAM_PERIPH_BIO 101 } cam_periph_type; 102 103 /* Generically useful offsets into the peripheral private area */ 104 #define ppriv_ptr0 periph_priv.entries[0].ptr 105 #define ppriv_ptr1 periph_priv.entries[1].ptr 106 #define ppriv_field0 periph_priv.entries[0].field 107 #define ppriv_field1 periph_priv.entries[1].field 108 109 typedef void periph_start_t (struct cam_periph *periph, 110 union ccb *start_ccb); 111 typedef cam_status periph_ctor_t (struct cam_periph *periph, 112 void *arg); 113 typedef void periph_oninv_t (struct cam_periph *periph); 114 typedef void periph_dtor_t (struct cam_periph *periph); 115 struct cam_periph { 116 periph_start_t *periph_start; 117 periph_oninv_t *periph_oninval; 118 periph_dtor_t *periph_dtor; 119 char *periph_name; 120 struct cam_path *path; /* Compiled path to device */ 121 void *softc; 122 struct cam_sim *sim; 123 u_int32_t unit_number; 124 cam_periph_type type; 125 u_int32_t flags; 126 #define CAM_PERIPH_RUNNING 0x01 127 #define CAM_PERIPH_LOCKED 0x02 128 #define CAM_PERIPH_LOCK_WANTED 0x04 129 #define CAM_PERIPH_INVALID 0x08 130 #define CAM_PERIPH_NEW_DEV_FOUND 0x10 131 #define CAM_PERIPH_RECOVERY_INPROG 0x20 132 #define CAM_PERIPH_RUN_TASK 0x40 133 #define CAM_PERIPH_FREE 0x80 134 #define CAM_PERIPH_ANNOUNCED 0x100 135 uint32_t scheduled_priority; 136 uint32_t immediate_priority; 137 int periph_allocating; 138 int periph_allocated; 139 u_int32_t refcount; 140 SLIST_HEAD(, ccb_hdr) ccb_list; /* For "immediate" requests */ 141 SLIST_ENTRY(cam_periph) periph_links; 142 TAILQ_ENTRY(cam_periph) unit_links; 143 ac_callback_t *deferred_callback; 144 ac_code deferred_ac; 145 struct task periph_run_task; 146 }; 147 148 #define CAM_PERIPH_MAXMAPS 2 149 150 struct cam_periph_map_info { 151 int num_bufs_used; 152 struct buf *bp[CAM_PERIPH_MAXMAPS]; 153 }; 154 155 cam_status cam_periph_alloc(periph_ctor_t *periph_ctor, 156 periph_oninv_t *periph_oninvalidate, 157 periph_dtor_t *periph_dtor, 158 periph_start_t *periph_start, 159 char *name, cam_periph_type type, struct cam_path *, 160 ac_callback_t *, ac_code, void *arg); 161 struct cam_periph *cam_periph_find(struct cam_path *path, char *name); 162 int cam_periph_list(struct cam_path *, struct sbuf *); 163 int cam_periph_acquire(struct cam_periph *periph); 164 void cam_periph_doacquire(struct cam_periph *periph); 165 void cam_periph_release(struct cam_periph *periph); 166 void cam_periph_release_locked(struct cam_periph *periph); 167 void cam_periph_release_locked_buses(struct cam_periph *periph); 168 int cam_periph_hold(struct cam_periph *periph, int priority); 169 void cam_periph_unhold(struct cam_periph *periph); 170 void cam_periph_invalidate(struct cam_periph *periph); 171 int cam_periph_mapmem(union ccb *ccb, 172 struct cam_periph_map_info *mapinfo, 173 u_int maxmap); 174 void cam_periph_unmapmem(union ccb *ccb, 175 struct cam_periph_map_info *mapinfo); 176 union ccb *cam_periph_getccb(struct cam_periph *periph, 177 u_int32_t priority); 178 int cam_periph_runccb(union ccb *ccb, 179 int (*error_routine)(union ccb *ccb, 180 cam_flags camflags, 181 u_int32_t sense_flags), 182 cam_flags camflags, u_int32_t sense_flags, 183 struct devstat *ds); 184 int cam_periph_ioctl(struct cam_periph *periph, u_long cmd, 185 caddr_t addr, 186 int (*error_routine)(union ccb *ccb, 187 cam_flags camflags, 188 u_int32_t sense_flags)); 189 void cam_freeze_devq(struct cam_path *path); 190 u_int32_t cam_release_devq(struct cam_path *path, u_int32_t relsim_flags, 191 u_int32_t opening_reduction, u_int32_t arg, 192 int getcount_only); 193 void cam_periph_async(struct cam_periph *periph, u_int32_t code, 194 struct cam_path *path, void *arg); 195 void cam_periph_bus_settle(struct cam_periph *periph, 196 u_int bus_settle_ms); 197 void cam_periph_freeze_after_event(struct cam_periph *periph, 198 struct timeval* event_time, 199 u_int duration_ms); 200 int cam_periph_error(union ccb *ccb, cam_flags camflags, 201 u_int32_t sense_flags); 202 int cam_periph_invalidate_sysctl(SYSCTL_HANDLER_ARGS); 203 204 static __inline struct mtx * 205 cam_periph_mtx(struct cam_periph *periph) 206 { 207 if (periph != NULL) 208 return (xpt_path_mtx(periph->path)); 209 else 210 return (NULL); 211 } 212 213 #define cam_periph_owned(periph) \ 214 mtx_owned(xpt_path_mtx((periph)->path)) 215 216 #define cam_periph_lock(periph) \ 217 mtx_lock(xpt_path_mtx((periph)->path)) 218 219 #define cam_periph_unlock(periph) \ 220 mtx_unlock(xpt_path_mtx((periph)->path)) 221 222 #define cam_periph_assert(periph, what) \ 223 mtx_assert(xpt_path_mtx((periph)->path), (what)) 224 225 #define cam_periph_sleep(periph, chan, priority, wmesg, timo) \ 226 xpt_path_sleep((periph)->path, (chan), (priority), (wmesg), (timo)) 227 228 static inline struct cam_periph * 229 cam_periph_acquire_first(struct periph_driver *driver) 230 { 231 struct cam_periph *periph; 232 233 xpt_lock_buses(); 234 periph = TAILQ_FIRST(&driver->units); 235 while (periph != NULL && (periph->flags & CAM_PERIPH_INVALID) != 0) 236 periph = TAILQ_NEXT(periph, unit_links); 237 if (periph != NULL) 238 periph->refcount++; 239 xpt_unlock_buses(); 240 return (periph); 241 } 242 243 static inline struct cam_periph * 244 cam_periph_acquire_next(struct cam_periph *pperiph) 245 { 246 struct cam_periph *periph = pperiph; 247 248 cam_periph_assert(pperiph, MA_NOTOWNED); 249 xpt_lock_buses(); 250 do { 251 periph = TAILQ_NEXT(periph, unit_links); 252 } while (periph != NULL && (periph->flags & CAM_PERIPH_INVALID) != 0); 253 if (periph != NULL) 254 periph->refcount++; 255 xpt_unlock_buses(); 256 cam_periph_release(pperiph); 257 return (periph); 258 } 259 260 #define CAM_PERIPH_FOREACH(periph, driver) \ 261 for ((periph) = cam_periph_acquire_first(driver); \ 262 (periph) != NULL; \ 263 (periph) = cam_periph_acquire_next(periph)) 264 265 #define CAM_PERIPH_PRINT(p, msg, args...) \ 266 printf("%s%d:" msg, (periph)->periph_name, (periph)->unit_number, ##args) 267 268 #endif /* _KERNEL */ 269 #endif /* _CAM_CAM_PERIPH_H */ 270