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 1.3 2003/07/19 21:14:11 dillon 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 linker_set periphdriver_set;
  42
  43 typedef void (periph_init_t)(void); /*
  44                                      * Callback informing the peripheral driver
  45                                      * it can perform it's initialization since
  46                                      * the XPT is now fully initialized.
  47                                      */
  48 typedef periph_init_t *periph_init_func_t;
  49
  50 struct periph_driver {
  51         periph_init_func_t       init;
  52         char                     *driver_name;
  53         TAILQ_HEAD(,cam_periph)  units;
  54         u_int                    generation;
  55 };
  56
  57 typedef enum {
  58         CAM_PERIPH_BIO,
  59         CAM_PERIPH_NET
  60 } cam_periph_type;
  61
  62 /* Generically usefull offsets into the peripheral private area */
  63 #define ppriv_ptr0 periph_priv.entries[0].ptr
  64 #define ppriv_ptr1 periph_priv.entries[1].ptr
  65 #define ppriv_field0 periph_priv.entries[0].field
  66 #define ppriv_field1 periph_priv.entries[1].field
  67
  68 typedef void            periph_start_t (struct cam_periph *periph,
  69                                         union ccb *start_ccb);
  70 typedef cam_status      periph_ctor_t (struct cam_periph *periph,
  71                                        void *arg);
  72 typedef void            periph_oninv_t (struct cam_periph *periph);
  73 typedef void            periph_dtor_t (struct cam_periph *periph);
  74 struct cam_periph {
  75         cam_pinfo                pinfo;
  76         periph_start_t          *periph_start;
  77         periph_oninv_t          *periph_oninval;
  78         periph_dtor_t           *periph_dtor;
  79         char                    *periph_name;
  80         struct cam_path         *path;  /* Compiled path to device */
  81         void                    *softc;
  82         u_int32_t                unit_number;
  83         cam_periph_type          type;
  84         u_int32_t                flags;
  85 #define CAM_PERIPH_RUNNING              0x01
  86 #define CAM_PERIPH_LOCKED               0x02
  87 #define CAM_PERIPH_LOCK_WANTED          0x04
  88 #define CAM_PERIPH_INVALID              0x08
  89 #define CAM_PERIPH_NEW_DEV_FOUND        0x10
  90 #define CAM_PERIPH_RECOVERY_INPROG      0x20
  91         u_int32_t                immediate_priority;
  92         u_int32_t                refcount;
  93         SLIST_HEAD(, ccb_hdr)    ccb_list;      /* For "immediate" requests */
  94         SLIST_ENTRY(cam_periph)  periph_links;
  95         TAILQ_ENTRY(cam_periph)  unit_links;
  96         ac_callback_t           *deferred_callback;
  97         ac_code                  deferred_ac;
  98 };
  99
 100 #define CAM_PERIPH_MAXMAPS      2
 101
 102 struct cam_periph_map_info {
 103         int             num_bufs_used;
 104         struct buf      *bp[CAM_PERIPH_MAXMAPS];
 105 };
 106
 107 cam_status cam_periph_alloc(periph_ctor_t *periph_ctor,
 108                             periph_oninv_t *periph_oninvalidate,
 109                             periph_dtor_t *periph_dtor,
 110                             periph_start_t *periph_start,
 111                             char *name, cam_periph_type type, struct cam_path *,
 112                             ac_callback_t *, ac_code, void *arg);
 113 struct cam_periph *cam_periph_find(struct cam_path *path, char *name);
 114 int             cam_periph_lock(struct cam_periph *periph, int flags);
 115 void            cam_periph_unlock(struct cam_periph *periph);
 116 cam_status      cam_periph_acquire(struct cam_periph *periph);
 117 void            cam_periph_release(struct cam_periph *periph);
 118 void            cam_periph_invalidate(struct cam_periph *periph);
 119 int             cam_periph_mapmem(union ccb *ccb,
 120                                   struct cam_periph_map_info *mapinfo);
 121 void            cam_periph_unmapmem(union ccb *ccb,
 122                                     struct cam_periph_map_info *mapinfo);
 123 union ccb       *cam_periph_getccb(struct cam_periph *periph,
 124                                    u_int32_t priority);
 125 void            cam_periph_ccbwait(union ccb *ccb);
 126 int             cam_periph_runccb(union ccb *ccb,
 127                                   int (*error_routine)(union ccb *ccb,
 128                                                        cam_flags camflags,
 129                                                        u_int32_t sense_flags),
 130                                   cam_flags camflags, u_int32_t sense_flags,
 131                                   struct devstat *ds);
 132 int             cam_periph_ioctl(struct cam_periph *periph, int cmd,
 133                                  caddr_t addr,
 134                                  int (*error_routine)(union ccb *ccb,
 135                                                       cam_flags camflags,
 136                                                       u_int32_t sense_flags));
 137 void            cam_freeze_devq(struct cam_path *path);
 138 u_int32_t       cam_release_devq(struct cam_path *path, u_int32_t relsim_flags,
 139                                  u_int32_t opening_reduction, u_int32_t timeout,
 140                                  int getcount_only);
 141 void            cam_periph_async(struct cam_periph *periph, u_int32_t code,
 142                                  struct cam_path *path, void *arg);
 143 void            cam_periph_bus_settle(struct cam_periph *periph,
 144                                       u_int bus_settle_ms);
 145 void            cam_periph_freeze_after_event(struct cam_periph *periph,
 146                                               struct timeval* event_time,
 147                                               u_int duration_ms);
 148 int             cam_periph_error(union ccb *ccb, cam_flags camflags,
 149                                  u_int32_t sense_flags, union ccb *save_ccb);
 150
 151 #endif /* _KERNEL */
 152 #endif /* _CAM_CAM_PERIPH_H */