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

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    1 /*-
    2  * Data structures and definitions for dealing with the 
    3  * Common Access Method Transport (xpt) layer.
    4  *
    5  * Copyright (c) 1997 Justin T. Gibbs.
    6  * All rights reserved.
    7  *
    8  * Redistribution and use in source and binary forms, with or without
    9  * modification, are permitted provided that the following conditions
   10  * are met:
   11  * 1. Redistributions of source code must retain the above copyright
   12  *    notice, this list of conditions, and the following disclaimer,
   13  *    without modification, immediately at the beginning of the file.
   14  * 2. The name of the author may not be used to endorse or promote products
   15  *    derived from this software without specific prior written permission.
   16  *
   17  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   20  * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR
   21  * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   27  * SUCH DAMAGE.
   28  *
   29  * $FreeBSD: releng/8.1/sys/cam/cam_xpt.h 203889 2010-02-14 19:38:27Z mav $
   30  */
   31 
   32 #ifndef _CAM_CAM_XPT_H
   33 #define _CAM_CAM_XPT_H 1
   34 
   35 /* Forward Declarations */
   36 union ccb;
   37 struct cam_periph;
   38 struct cam_sim;
   39 
   40 /*
   41  * Definition of a CAM path.  Paths are created from bus, target, and lun ids
   42  * via xpt_create_path and allow for reference to devices without recurring
   43  * lookups in the edt.
   44  */
   45 struct cam_path;
   46 
   47 /* Path functions */
   48 
   49 #ifdef _KERNEL
   50 
   51 /*
   52  * Definition of an async handler callback block.  These are used to add
   53  * SIMs and peripherals to the async callback lists.
   54  */
   55 struct async_node {
   56         SLIST_ENTRY(async_node) links;
   57         u_int32_t       event_enable;   /* Async Event enables */
   58         void            (*callback)(void *arg, u_int32_t code,
   59                                     struct cam_path *path, void *args);
   60         void            *callback_arg;
   61 };
   62 
   63 SLIST_HEAD(async_list, async_node);
   64 SLIST_HEAD(periph_list, cam_periph);
   65 
   66 #if defined(CAM_DEBUG_FLAGS) && !defined(CAMDEBUG)
   67 #error "You must have options CAMDEBUG to use options CAM_DEBUG_FLAGS"
   68 #endif
   69 
   70 /*
   71  * In order to enable the CAM_DEBUG_* options, the user must have CAMDEBUG
   72  * enabled.  Also, the user must have either none, or all of CAM_DEBUG_BUS,
   73  * CAM_DEBUG_TARGET, and CAM_DEBUG_LUN specified.
   74  */
   75 #if defined(CAM_DEBUG_BUS) || defined(CAM_DEBUG_TARGET) \
   76     || defined(CAM_DEBUG_LUN)
   77 #ifdef CAMDEBUG
   78 #if !defined(CAM_DEBUG_BUS) || !defined(CAM_DEBUG_TARGET) \
   79     || !defined(CAM_DEBUG_LUN)
   80 #error "You must define all or none of CAM_DEBUG_BUS, CAM_DEBUG_TARGET \
   81         and CAM_DEBUG_LUN"
   82 #endif /* !CAM_DEBUG_BUS || !CAM_DEBUG_TARGET || !CAM_DEBUG_LUN */
   83 #else /* !CAMDEBUG */
   84 #error "You must use options CAMDEBUG if you use the CAM_DEBUG_* options"
   85 #endif /* CAMDEBUG */
   86 #endif /* CAM_DEBUG_BUS || CAM_DEBUG_TARGET || CAM_DEBUG_LUN */
   87 
   88 void                    xpt_action(union ccb *new_ccb);
   89 void                    xpt_action_default(union ccb *new_ccb);
   90 union ccb               *xpt_alloc_ccb(void);
   91 union ccb               *xpt_alloc_ccb_nowait(void);
   92 void                    xpt_free_ccb(union ccb *free_ccb);
   93 void                    xpt_setup_ccb(struct ccb_hdr *ccb_h,
   94                                       struct cam_path *path,
   95                                       u_int32_t priority);
   96 void                    xpt_merge_ccb(union ccb *master_ccb,
   97                                       union ccb *slave_ccb);
   98 cam_status              xpt_create_path(struct cam_path **new_path_ptr,
   99                                         struct cam_periph *perph,
  100                                         path_id_t path_id,
  101                                         target_id_t target_id, lun_id_t lun_id);
  102 cam_status              xpt_create_path_unlocked(struct cam_path **new_path_ptr,
  103                                         struct cam_periph *perph,
  104                                         path_id_t path_id,
  105                                         target_id_t target_id, lun_id_t lun_id);
  106 void                    xpt_free_path(struct cam_path *path);
  107 int                     xpt_path_comp(struct cam_path *path1,
  108                                       struct cam_path *path2);
  109 void                    xpt_print_path(struct cam_path *path);
  110 void                    xpt_print(struct cam_path *path, const char *fmt, ...);
  111 int                     xpt_path_string(struct cam_path *path, char *str,
  112                                         size_t str_len);
  113 path_id_t               xpt_path_path_id(struct cam_path *path);
  114 target_id_t             xpt_path_target_id(struct cam_path *path);
  115 lun_id_t                xpt_path_lun_id(struct cam_path *path);
  116 struct cam_sim          *xpt_path_sim(struct cam_path *path);
  117 struct cam_periph       *xpt_path_periph(struct cam_path *path);
  118 void                    xpt_async(u_int32_t async_code, struct cam_path *path,
  119                                   void *async_arg);
  120 void                    xpt_rescan(union ccb *ccb);
  121 void                    xpt_hold_boot(void);
  122 void                    xpt_release_boot(void);
  123 void                    xpt_lock_buses(void);
  124 void                    xpt_unlock_buses(void);
  125 cam_status              xpt_register_async(int event, ac_callback_t *cbfunc,
  126                                            void *cbarg, struct cam_path *path);
  127 cam_status              xpt_compile_path(struct cam_path *new_path,
  128                                          struct cam_periph *perph,
  129                                          path_id_t path_id,
  130                                          target_id_t target_id,
  131                                          lun_id_t lun_id);
  132 
  133 void                    xpt_release_path(struct cam_path *path);
  134 
  135 #endif /* _KERNEL */
  136 
  137 #endif /* _CAM_CAM_XPT_H */
  138 

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