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: releng/10.1/sys/cam/cam_periph.h 260626 2014-01-14 12:01:36Z mav $
   29  */
   30 
   31 #ifndef _CAM_CAM_PERIPH_H
   32 #define _CAM_CAM_PERIPH_H 1
   33 
   34 #include <sys/queue.h>
   35 #include <cam/cam_sim.h>
   36 
   37 #ifdef _KERNEL
   38 #include <sys/taskqueue.h>
   39 
   40 #include <cam/cam_xpt.h>
   41 
   42 struct devstat;
   43 
   44 extern struct cam_periph *xpt_periph;
   45 
   46 extern struct periph_driver **periph_drivers;
   47 void periphdriver_register(void *);
   48 void periphdriver_init(int level);
   49 
   50 #include <sys/module.h>
   51 #define PERIPHDRIVER_DECLARE(name, driver) \
   52         static int name ## _modevent(module_t mod, int type, void *data) \
   53         { \
   54                 switch (type) { \
   55                 case MOD_LOAD: \
   56                         periphdriver_register(data); \
   57                         break; \
   58                 case MOD_UNLOAD: \
   59                         printf(#name " module unload - not possible for this module type\n"); \
   60                         return EINVAL; \
   61                 default: \
   62                         return EOPNOTSUPP; \
   63                 } \
   64                 return 0; \
   65         } \
   66         static moduledata_t name ## _mod = { \
   67                 #name, \
   68                 name ## _modevent, \
   69                 (void *)&driver \
   70         }; \
   71         DECLARE_MODULE(name, name ## _mod, SI_SUB_DRIVERS, SI_ORDER_ANY); \
   72         MODULE_DEPEND(name, cam, 1, 1, 1)
   73 
   74 typedef void (periph_init_t)(void); /*
   75                                      * Callback informing the peripheral driver
   76                                      * it can perform it's initialization since
   77                                      * the XPT is now fully initialized.
   78                                      */
   79 typedef periph_init_t *periph_init_func_t;
   80 
   81 struct periph_driver {
   82         periph_init_func_t       init;
   83         char                     *driver_name;
   84         TAILQ_HEAD(,cam_periph)  units;
   85         u_int                    generation;
   86         u_int                    flags;
   87 #define CAM_PERIPH_DRV_EARLY            0x01
   88 };
   89 
   90 typedef enum {
   91         CAM_PERIPH_BIO
   92 } cam_periph_type;
   93 
   94 /* Generically useful offsets into the peripheral private area */
   95 #define ppriv_ptr0 periph_priv.entries[0].ptr
   96 #define ppriv_ptr1 periph_priv.entries[1].ptr
   97 #define ppriv_field0 periph_priv.entries[0].field
   98 #define ppriv_field1 periph_priv.entries[1].field
   99 
  100 typedef void            periph_start_t (struct cam_periph *periph,
  101                                         union ccb *start_ccb);
  102 typedef cam_status      periph_ctor_t (struct cam_periph *periph,
  103                                        void *arg);
  104 typedef void            periph_oninv_t (struct cam_periph *periph);
  105 typedef void            periph_dtor_t (struct cam_periph *periph);
  106 struct cam_periph {
  107         periph_start_t          *periph_start;
  108         periph_oninv_t          *periph_oninval;
  109         periph_dtor_t           *periph_dtor;
  110         char                    *periph_name;
  111         struct cam_path         *path;  /* Compiled path to device */
  112         void                    *softc;
  113         struct cam_sim          *sim;
  114         u_int32_t                unit_number;
  115         cam_periph_type          type;
  116         u_int32_t                flags;
  117 #define CAM_PERIPH_RUNNING              0x01
  118 #define CAM_PERIPH_LOCKED               0x02
  119 #define CAM_PERIPH_LOCK_WANTED          0x04
  120 #define CAM_PERIPH_INVALID              0x08
  121 #define CAM_PERIPH_NEW_DEV_FOUND        0x10
  122 #define CAM_PERIPH_RECOVERY_INPROG      0x20
  123 #define CAM_PERIPH_RUN_TASK             0x40
  124 #define CAM_PERIPH_FREE                 0x80
  125 #define CAM_PERIPH_ANNOUNCED            0x100
  126         uint32_t                 scheduled_priority;
  127         uint32_t                 immediate_priority;
  128         int                      periph_allocating;
  129         int                      periph_allocated;
  130         u_int32_t                refcount;
  131         SLIST_HEAD(, ccb_hdr)    ccb_list;      /* For "immediate" requests */
  132         SLIST_ENTRY(cam_periph)  periph_links;
  133         TAILQ_ENTRY(cam_periph)  unit_links;
  134         ac_callback_t           *deferred_callback; 
  135         ac_code                  deferred_ac;
  136         struct task              periph_run_task;
  137 };
  138 
  139 #define CAM_PERIPH_MAXMAPS      2
  140 
  141 struct cam_periph_map_info {
  142         int             num_bufs_used;
  143         struct buf      *bp[CAM_PERIPH_MAXMAPS];
  144 };
  145 
  146 cam_status cam_periph_alloc(periph_ctor_t *periph_ctor,
  147                             periph_oninv_t *periph_oninvalidate,
  148                             periph_dtor_t *periph_dtor,
  149                             periph_start_t *periph_start,
  150                             char *name, cam_periph_type type, struct cam_path *,
  151                             ac_callback_t *, ac_code, void *arg);
  152 struct cam_periph *cam_periph_find(struct cam_path *path, char *name);
  153 int             cam_periph_list(struct cam_path *, struct sbuf *);
  154 cam_status      cam_periph_acquire(struct cam_periph *periph);
  155 void            cam_periph_doacquire(struct cam_periph *periph);
  156 void            cam_periph_release(struct cam_periph *periph);
  157 void            cam_periph_release_locked(struct cam_periph *periph);
  158 void            cam_periph_release_locked_buses(struct cam_periph *periph);
  159 int             cam_periph_hold(struct cam_periph *periph, int priority);
  160 void            cam_periph_unhold(struct cam_periph *periph);
  161 void            cam_periph_invalidate(struct cam_periph *periph);
  162 int             cam_periph_mapmem(union ccb *ccb,
  163                                   struct cam_periph_map_info *mapinfo);
  164 void            cam_periph_unmapmem(union ccb *ccb,
  165                                     struct cam_periph_map_info *mapinfo);
  166 union ccb       *cam_periph_getccb(struct cam_periph *periph,
  167                                    u_int32_t priority);
  168 void            cam_periph_ccbwait(union ccb *ccb);
  169 int             cam_periph_runccb(union ccb *ccb,
  170                                   int (*error_routine)(union ccb *ccb,
  171                                                        cam_flags camflags,
  172                                                        u_int32_t sense_flags),
  173                                   cam_flags camflags, u_int32_t sense_flags,
  174                                   struct devstat *ds);
  175 int             cam_periph_ioctl(struct cam_periph *periph, u_long cmd, 
  176                                  caddr_t addr,
  177                                  int (*error_routine)(union ccb *ccb,
  178                                                       cam_flags camflags,
  179                                                       u_int32_t sense_flags));
  180 void            cam_freeze_devq(struct cam_path *path);
  181 u_int32_t       cam_release_devq(struct cam_path *path, u_int32_t relsim_flags,
  182                                  u_int32_t opening_reduction, u_int32_t arg,
  183                                  int getcount_only);
  184 void            cam_periph_async(struct cam_periph *periph, u_int32_t code,
  185                                  struct cam_path *path, void *arg);
  186 void            cam_periph_bus_settle(struct cam_periph *periph,
  187                                       u_int bus_settle_ms);
  188 void            cam_periph_freeze_after_event(struct cam_periph *periph,
  189                                               struct timeval* event_time,
  190                                               u_int duration_ms);
  191 int             cam_periph_error(union ccb *ccb, cam_flags camflags,
  192                                  u_int32_t sense_flags, union ccb *save_ccb);
  193 
  194 static __inline struct mtx *
  195 cam_periph_mtx(struct cam_periph *periph)
  196 {
  197         return (xpt_path_mtx(periph->path));
  198 }
  199 
  200 #define cam_periph_owned(periph)                                        \
  201         mtx_owned(xpt_path_mtx((periph)->path))
  202 
  203 #define cam_periph_lock(periph)                                         \
  204         mtx_lock(xpt_path_mtx((periph)->path))
  205 
  206 #define cam_periph_unlock(periph)                                       \
  207         mtx_unlock(xpt_path_mtx((periph)->path))
  208 
  209 #define cam_periph_assert(periph, what)                                 \
  210         mtx_assert(xpt_path_mtx((periph)->path), (what))
  211 
  212 #define cam_periph_sleep(periph, chan, priority, wmesg, timo)           \
  213         xpt_path_sleep((periph)->path, (chan), (priority), (wmesg), (timo))
  214 
  215 static inline struct cam_periph *
  216 cam_periph_acquire_first(struct periph_driver *driver)
  217 {
  218         struct cam_periph *periph;
  219 
  220         xpt_lock_buses();
  221         periph = TAILQ_FIRST(&driver->units);
  222         while (periph != NULL && (periph->flags & CAM_PERIPH_INVALID) != 0)
  223                 periph = TAILQ_NEXT(periph, unit_links);
  224         if (periph != NULL)
  225                 periph->refcount++;
  226         xpt_unlock_buses();
  227         return (periph);
  228 }
  229 
  230 static inline struct cam_periph *
  231 cam_periph_acquire_next(struct cam_periph *pperiph)
  232 {
  233         struct cam_periph *periph = pperiph;
  234 
  235         cam_periph_assert(pperiph, MA_NOTOWNED);
  236         xpt_lock_buses();
  237         do {
  238                 periph = TAILQ_NEXT(periph, unit_links);
  239         } while (periph != NULL && (periph->flags & CAM_PERIPH_INVALID) != 0);
  240         if (periph != NULL)
  241                 periph->refcount++;
  242         xpt_unlock_buses();
  243         cam_periph_release(pperiph);
  244         return (periph);
  245 }
  246 
  247 #define CAM_PERIPH_FOREACH(periph, driver)                              \
  248         for ((periph) = cam_periph_acquire_first(driver);               \
  249             (periph) != NULL;                                           \
  250             (periph) = cam_periph_acquire_next(periph))
  251 
  252 #endif /* _KERNEL */
  253 #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
