sys/bus/cam/cam_periph.h

   1 /*
   2  * Data structures and definitions for CAM peripheral ("type") drivers.
   3  *
   4  * Copyright (c) 1997, 1998 Justin T. Gibbs.
   5  * All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions, and the following disclaimer,
  12  *    without modification, immediately at the beginning of the file.
  13  * 2. The name of the author may not be used to endorse or promote products
  14  *    derived from this software without specific prior written permission.
  15  *
  16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  17  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  18  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  19  * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR
  20  * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  21  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  22  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  23  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  24  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  25  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  26  * SUCH DAMAGE.
  27  *
  28  * $FreeBSD: src/sys/cam/cam_periph.h,v 1.6.2.1 2000/05/07 18:16:49 n_hibma Exp $
  29  * $DragonFly: src/sys/bus/cam/cam_periph.h,v 1.9 2007/11/28 22:11:02 pavalos Exp $
  30  */
  31
  32 #ifndef _CAM_CAM_PERIPH_H
  33 #define _CAM_CAM_PERIPH_H 1
  34
  35 #include <sys/queue.h>
  36
  37 #ifdef _KERNEL
  38
  39 extern struct cam_periph *xpt_periph;
  40
  41 extern struct periph_driver **periph_drivers;
  42 void periphdriver_register(void *);
  43
  44 #include <sys/module.h>
  45 #define PERIPHDRIVER_DECLARE(name, driver) \
  46         static int name ## _modevent(module_t mod, int type, void *data) \
  47         { \
  48                 switch (type) { \
  49                 case MOD_LOAD: \
  50                         periphdriver_register(data); \
  51                         break; \
  52                 case MOD_UNLOAD: \
  53                         kprintf(#name " module unload - not possible for this module type\n"); \
  54                         return EINVAL; \
  55                 default: \
  56                         return EOPNOTSUPP; \
  57                 } \
  58                 return 0; \
  59         } \
  60         static moduledata_t name ## _mod = { \
  61                 #name, \
  62                 name ## _modevent, \
  63                 (void *)&driver \
  64         }; \
  65         DECLARE_MODULE(name, name ## _mod, SI_SUB_DRIVERS, SI_ORDER_ANY); \
  66         MODULE_DEPEND(name, cam, 1, 1, 1)
  67
  68 typedef void (periph_init_t)(void); /*
  69                                      * Callback informing the peripheral driver
  70                                      * it can perform it's initialization since
  71                                      * the XPT is now fully initialized.
  72                                      */
  73 typedef periph_init_t *periph_init_func_t;
  74
  75 struct periph_driver {
  76         periph_init_func_t       init;
  77         char                     *driver_name;
  78         TAILQ_HEAD(,cam_periph)  units;
  79         u_int                    generation;
  80 };
  81
  82 typedef enum {
  83         CAM_PERIPH_BIO
  84 } cam_periph_type;
  85
  86 /* Generically usefull offsets into the peripheral private area */
  87 #define ppriv_ptr0 periph_priv.entries[0].ptr
  88 #define ppriv_ptr1 periph_priv.entries[1].ptr
  89 #define ppriv_field0 periph_priv.entries[0].field
  90 #define ppriv_field1 periph_priv.entries[1].field
  91
  92 typedef void            periph_start_t (struct cam_periph *periph,
  93                                         union ccb *start_ccb);
  94 typedef cam_status      periph_ctor_t (struct cam_periph *periph,
  95                                        void *arg);
  96 typedef void            periph_oninv_t (struct cam_periph *periph);
  97 typedef void            periph_dtor_t (struct cam_periph *periph);
  98 struct cam_periph {
  99         cam_pinfo                pinfo;
 100         periph_start_t          *periph_start;
 101         periph_oninv_t          *periph_oninval;
 102         periph_dtor_t           *periph_dtor;
 103         char                    *periph_name;
 104         struct cam_path         *path;  /* Compiled path to device */
 105         void                    *softc;
 106         u_int32_t                unit_number;
 107         cam_periph_type          type;
 108         u_int32_t                flags;
 109 #define CAM_PERIPH_RUNNING              0x01
 110 #define CAM_PERIPH_LOCKED               0x02
 111 #define CAM_PERIPH_LOCK_WANTED          0x04
 112 #define CAM_PERIPH_INVALID              0x08
 113 #define CAM_PERIPH_NEW_DEV_FOUND        0x10
 114 #define CAM_PERIPH_RECOVERY_INPROG      0x20
 115         u_int32_t                immediate_priority;
 116         u_int32_t                refcount;
 117         SLIST_HEAD(, ccb_hdr)    ccb_list;      /* For "immediate" requests */
 118         SLIST_ENTRY(cam_periph)  periph_links;
 119         TAILQ_ENTRY(cam_periph)  unit_links;
 120         ac_callback_t           *deferred_callback;
 121         ac_code                  deferred_ac;
 122 };
 123
 124 #define CAM_PERIPH_MAXMAPS      2
 125
 126 struct devstat;
 127
 128 struct cam_periph_map_info {
 129         int             num_bufs_used;
 130         struct buf      *bp[CAM_PERIPH_MAXMAPS];
 131         caddr_t         saved_ptrs[CAM_PERIPH_MAXMAPS];
 132 };
 133
 134 cam_status cam_periph_alloc(periph_ctor_t *periph_ctor,
 135                             periph_oninv_t *periph_oninvalidate,
 136                             periph_dtor_t *periph_dtor,
 137                             periph_start_t *periph_start,
 138                             char *name, cam_periph_type type, struct cam_path *,
 139                             ac_callback_t *, ac_code, void *arg);
 140 struct cam_periph *cam_periph_find(struct cam_path *path, char *name);
 141 int             cam_periph_lock(struct cam_periph *periph, int flags);
 142 void            cam_periph_unlock(struct cam_periph *periph);
 143 cam_status      cam_periph_acquire(struct cam_periph *periph);
 144 void            cam_periph_release(struct cam_periph *periph);
 145 void            cam_periph_invalidate(struct cam_periph *periph);
 146 int             cam_periph_mapmem(union ccb *ccb,
 147                                   struct cam_periph_map_info *mapinfo);
 148 void            cam_periph_unmapmem(union ccb *ccb,
 149                                     struct cam_periph_map_info *mapinfo);
 150 union ccb       *cam_periph_getccb(struct cam_periph *periph,
 151                                    u_int32_t priority);
 152 void            cam_periph_ccbwait(union ccb *ccb);
 153 int             cam_periph_runccb(union ccb *ccb,
 154                                   int (*error_routine)(union ccb *ccb,
 155                                                        cam_flags camflags,
 156                                                        u_int32_t sense_flags),
 157                                   cam_flags camflags, u_int32_t sense_flags,
 158                                   struct devstat *ds);
 159 int             cam_periph_ioctl(struct cam_periph *periph, int cmd,
 160                                  caddr_t addr,
 161                                  int (*error_routine)(union ccb *ccb,
 162                                                       cam_flags camflags,
 163                                                       u_int32_t sense_flags));
 164 void            cam_freeze_devq(struct cam_path *path);
 165 u_int32_t       cam_release_devq(struct cam_path *path, u_int32_t relsim_flags,
 166                                  u_int32_t opening_reduction, u_int32_t timeout,
 167                                  int getcount_only);
 168 void            cam_periph_async(struct cam_periph *periph, u_int32_t code,
 169                                  struct cam_path *path, void *arg);
 170 void            cam_periph_bus_settle(struct cam_periph *periph,
 171                                       u_int bus_settle_ms);
 172 void            cam_periph_freeze_after_event(struct cam_periph *periph,
 173                                               struct timeval* event_time,
 174                                               u_int duration_ms);
 175 int             cam_periph_error(union ccb *ccb, cam_flags camflags,
 176                                  u_int32_t sense_flags, union ccb *save_ccb);
 177
 178 #endif /* _KERNEL */
 179 #endif /* _CAM_CAM_PERIPH_H */