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/11.2/sys/cam/cam_xpt.h 291716 2015-12-03 20:54:55Z ken $
   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_ed;
   39 struct cam_sim;
   40 
   41 /*
   42  * Definition of a CAM path.  Paths are created from bus, target, and lun ids
   43  * via xpt_create_path and allow for reference to devices without recurring
   44  * lookups in the edt.
   45  */
   46 struct cam_path;
   47 
   48 /* Path functions */
   49 
   50 #ifdef _KERNEL
   51 
   52 /*
   53  * Definition of an async handler callback block.  These are used to add
   54  * SIMs and peripherals to the async callback lists.
   55  */
   56 struct async_node {
   57         SLIST_ENTRY(async_node) links;
   58         u_int32_t       event_enable;   /* Async Event enables */
   59         u_int32_t       event_lock;     /* Take SIM lock for handlers. */
   60         void            (*callback)(void *arg, u_int32_t code,
   61                                     struct cam_path *path, void *args);
   62         void            *callback_arg;
   63 };
   64 
   65 SLIST_HEAD(async_list, async_node);
   66 SLIST_HEAD(periph_list, cam_periph);
   67 
   68 void                    xpt_action(union ccb *new_ccb);
   69 void                    xpt_action_default(union ccb *new_ccb);
   70 union ccb               *xpt_alloc_ccb(void);
   71 union ccb               *xpt_alloc_ccb_nowait(void);
   72 void                    xpt_free_ccb(union ccb *free_ccb);
   73 void                    xpt_setup_ccb_flags(struct ccb_hdr *ccb_h,
   74                                             struct cam_path *path,
   75                                             u_int32_t priority,
   76                                             u_int32_t flags);
   77 void                    xpt_setup_ccb(struct ccb_hdr *ccb_h,
   78                                       struct cam_path *path,
   79                                       u_int32_t priority);
   80 void                    xpt_merge_ccb(union ccb *master_ccb,
   81                                       union ccb *slave_ccb);
   82 cam_status              xpt_create_path(struct cam_path **new_path_ptr,
   83                                         struct cam_periph *perph,
   84                                         path_id_t path_id,
   85                                         target_id_t target_id, lun_id_t lun_id);
   86 cam_status              xpt_create_path_unlocked(struct cam_path **new_path_ptr,
   87                                         struct cam_periph *perph,
   88                                         path_id_t path_id,
   89                                         target_id_t target_id, lun_id_t lun_id);
   90 int                     xpt_getattr(char *buf, size_t len, const char *attr,
   91                                     struct cam_path *path);
   92 void                    xpt_free_path(struct cam_path *path);
   93 void                    xpt_path_counts(struct cam_path *path, uint32_t *bus_ref,
   94                                         uint32_t *periph_ref, uint32_t *target_ref,
   95                                         uint32_t *device_ref);
   96 int                     xpt_path_comp(struct cam_path *path1,
   97                                       struct cam_path *path2);
   98 int                     xpt_path_comp_dev(struct cam_path *path,
   99                                           struct cam_ed *dev);
  100 void                    xpt_print_path(struct cam_path *path);
  101 void                    xpt_print_device(struct cam_ed *device);
  102 void                    xpt_print(struct cam_path *path, const char *fmt, ...);
  103 int                     xpt_path_string(struct cam_path *path, char *str,
  104                                         size_t str_len);
  105 path_id_t               xpt_path_path_id(struct cam_path *path);
  106 target_id_t             xpt_path_target_id(struct cam_path *path);
  107 lun_id_t                xpt_path_lun_id(struct cam_path *path);
  108 struct cam_sim          *xpt_path_sim(struct cam_path *path);
  109 struct cam_periph       *xpt_path_periph(struct cam_path *path);
  110 void                    xpt_async(u_int32_t async_code, struct cam_path *path,
  111                                   void *async_arg);
  112 void                    xpt_rescan(union ccb *ccb);
  113 void                    xpt_hold_boot(void);
  114 void                    xpt_release_boot(void);
  115 void                    xpt_lock_buses(void);
  116 void                    xpt_unlock_buses(void);
  117 struct mtx *            xpt_path_mtx(struct cam_path *path);
  118 #define xpt_path_lock(path)     mtx_lock(xpt_path_mtx(path))
  119 #define xpt_path_unlock(path)   mtx_unlock(xpt_path_mtx(path))
  120 #define xpt_path_assert(path, what)     mtx_assert(xpt_path_mtx(path), (what))
  121 #define xpt_path_owned(path)    mtx_owned(xpt_path_mtx(path))
  122 #define xpt_path_sleep(path, chan, priority, wmesg, timo)               \
  123     msleep((chan), xpt_path_mtx(path), (priority), (wmesg), (timo))
  124 cam_status              xpt_register_async(int event, ac_callback_t *cbfunc,
  125                                            void *cbarg, struct cam_path *path);
  126 cam_status              xpt_compile_path(struct cam_path *new_path,
  127                                          struct cam_periph *perph,
  128                                          path_id_t path_id,
  129                                          target_id_t target_id,
  130                                          lun_id_t lun_id);
  131 cam_status              xpt_clone_path(struct cam_path **new_path,
  132                                       struct cam_path *path);
  133 void                    xpt_copy_path(struct cam_path *new_path,
  134                                       struct cam_path *path);
  135 
  136 void                    xpt_release_path(struct cam_path *path);
  137 
  138 #endif /* _KERNEL */
  139 
  140 #endif /* _CAM_CAM_XPT_H */

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

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