cam_periph.h

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    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  * $FreeBSD$
   29  */
   30 
   31 #ifndef _CAM_CAM_PERIPH_H
   32 #define _CAM_CAM_PERIPH_H 1
   33 
   34 #include <sys/queue.h>
   35 
   36 #ifdef _KERNEL
   37 
   38 extern struct cam_periph *xpt_periph;
   39 
   40 extern struct linker_set periphdriver_set;
   41 
   42 typedef void (periph_init_t)(void); /*
   43                                      * Callback informing the peripheral driver
   44                                      * it can perform it's initialization since
   45                                      * the XPT is now fully initialized.
   46                                      */
   47 typedef periph_init_t *periph_init_func_t;
   48 
   49 struct periph_driver {
   50         periph_init_func_t       init;
   51         char                     *driver_name;
   52         TAILQ_HEAD(,cam_periph)  units;
   53         u_int                    generation;
   54 };
   55 
   56 typedef enum {
   57         CAM_PERIPH_BIO,
   58         CAM_PERIPH_NET
   59 } cam_periph_type;
   60 
   61 /* Generically usefull offsets into the peripheral private area */
   62 #define ppriv_ptr0 periph_priv.entries[0].ptr
   63 #define ppriv_ptr1 periph_priv.entries[1].ptr
   64 #define ppriv_field0 periph_priv.entries[0].field
   65 #define ppriv_field1 periph_priv.entries[1].field
   66 
   67 typedef void            periph_start_t (struct cam_periph *periph,
   68                                         union ccb *start_ccb);
   69 typedef cam_status      periph_ctor_t (struct cam_periph *periph,
   70                                        void *arg);
   71 typedef void            periph_oninv_t (struct cam_periph *periph);
   72 typedef void            periph_dtor_t (struct cam_periph *periph);
   73 struct cam_periph {
   74         cam_pinfo                pinfo;
   75         periph_start_t          *periph_start;
   76         periph_oninv_t          *periph_oninval;
   77         periph_dtor_t           *periph_dtor;
   78         char                    *periph_name;
   79         struct cam_path         *path;  /* Compiled path to device */
   80         void                    *softc;
   81         u_int32_t                unit_number;
   82         cam_periph_type          type;
   83         u_int32_t                flags;
   84 #define CAM_PERIPH_RUNNING              0x01
   85 #define CAM_PERIPH_LOCKED               0x02
   86 #define CAM_PERIPH_LOCK_WANTED          0x04
   87 #define CAM_PERIPH_INVALID              0x08
   88 #define CAM_PERIPH_NEW_DEV_FOUND        0x10
   89 #define CAM_PERIPH_RECOVERY_INPROG      0x20
   90         u_int32_t                immediate_priority;
   91         u_int32_t                refcount;
   92         SLIST_HEAD(, ccb_hdr)    ccb_list;      /* For "immediate" requests */
   93         SLIST_ENTRY(cam_periph)  periph_links;
   94         TAILQ_ENTRY(cam_periph)  unit_links;
   95         ac_callback_t           *deferred_callback; 
   96         ac_code                  deferred_ac;
   97 };
   98 
   99 #define CAM_PERIPH_MAXMAPS      2
  100 
  101 struct cam_periph_map_info {
  102         int             num_bufs_used;
  103         struct buf      *bp[CAM_PERIPH_MAXMAPS];
  104 };
  105 
  106 cam_status cam_periph_alloc(periph_ctor_t *periph_ctor,
  107                             periph_oninv_t *periph_oninvalidate,
  108                             periph_dtor_t *periph_dtor,
  109                             periph_start_t *periph_start,
  110                             char *name, cam_periph_type type, struct cam_path *,
  111                             ac_callback_t *, ac_code, void *arg);
  112 struct cam_periph *cam_periph_find(struct cam_path *path, char *name);
  113 int             cam_periph_lock(struct cam_periph *periph, int priority);
  114 void            cam_periph_unlock(struct cam_periph *periph);
  115 cam_status      cam_periph_acquire(struct cam_periph *periph);
  116 void            cam_periph_release(struct cam_periph *periph);
  117 void            cam_periph_invalidate(struct cam_periph *periph);
  118 int             cam_periph_mapmem(union ccb *ccb,
  119                                   struct cam_periph_map_info *mapinfo);
  120 void            cam_periph_unmapmem(union ccb *ccb,
  121                                     struct cam_periph_map_info *mapinfo);
  122 union ccb       *cam_periph_getccb(struct cam_periph *periph,
  123                                    u_int32_t priority);
  124 void            cam_periph_ccbwait(union ccb *ccb);
  125 int             cam_periph_runccb(union ccb *ccb,
  126                                   int (*error_routine)(union ccb *ccb,
  127                                                        cam_flags camflags,
  128                                                        u_int32_t sense_flags),
  129                                   cam_flags camflags, u_int32_t sense_flags,
  130                                   struct devstat *ds);
  131 int             cam_periph_ioctl(struct cam_periph *periph, int cmd, 
  132                                  caddr_t addr,
  133                                  int (*error_routine)(union ccb *ccb,
  134                                                       cam_flags camflags,
  135                                                       u_int32_t sense_flags));
  136 void            cam_freeze_devq(struct cam_path *path);
  137 u_int32_t       cam_release_devq(struct cam_path *path, u_int32_t relsim_flags,
  138                                  u_int32_t opening_reduction, u_int32_t timeout,
  139                                  int getcount_only);
  140 void            cam_periph_async(struct cam_periph *periph, u_int32_t code,
  141                                  struct cam_path *path, void *arg);
  142 void            cam_periph_bus_settle(struct cam_periph *periph,
  143                                       u_int bus_settle_ms);
  144 void            cam_periph_freeze_after_event(struct cam_periph *periph,
  145                                               struct timeval* event_time,
  146                                               u_int duration_ms);
  147 int             cam_periph_error(union ccb *ccb, cam_flags camflags,
  148                                  u_int32_t sense_flags, union ccb *save_ccb);
  149 
  150 #endif /* _KERNEL */
  151 #endif /* _CAM_CAM_PERIPH_H */

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FreeBSD/Linux Kernel Cross Reference sys/cam/cam_periph.h

FreeBSD/Linux Kernel Cross Reference
sys/cam/cam_periph.h