sys/cam/cam_xpt.h

   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  * $FreeBSD$
  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 void                    xpt_action(union ccb *new_ccb);
  67 void                    xpt_action_default(union ccb *new_ccb);
  68 union ccb               *xpt_alloc_ccb(void);
  69 union ccb               *xpt_alloc_ccb_nowait(void);
  70 void                    xpt_free_ccb(union ccb *free_ccb);
  71 void                    xpt_setup_ccb(struct ccb_hdr *ccb_h,
  72                                       struct cam_path *path,
  73                                       u_int32_t priority);
  74 void                    xpt_merge_ccb(union ccb *master_ccb,
  75                                       union ccb *slave_ccb);
  76 cam_status              xpt_create_path(struct cam_path **new_path_ptr,
  77                                         struct cam_periph *perph,
  78                                         path_id_t path_id,
  79                                         target_id_t target_id, lun_id_t lun_id);
  80 cam_status              xpt_create_path_unlocked(struct cam_path **new_path_ptr,
  81                                         struct cam_periph *perph,
  82                                         path_id_t path_id,
  83                                         target_id_t target_id, lun_id_t lun_id);
  84 int                     xpt_getattr(char *buf, size_t len, const char *attr,
  85                                     struct cam_path *path);
  86 void                    xpt_free_path(struct cam_path *path);
  87 void                    xpt_path_counts(struct cam_path *path, uint32_t *bus_ref,
  88                                         uint32_t *periph_ref, uint32_t *target_ref,
  89                                         uint32_t *device_ref);
  90 int                     xpt_path_comp(struct cam_path *path1,
  91                                       struct cam_path *path2);
  92 void                    xpt_print_path(struct cam_path *path);
  93 void                    xpt_print(struct cam_path *path, const char *fmt, ...);
  94 int                     xpt_path_string(struct cam_path *path, char *str,
  95                                         size_t str_len);
  96 path_id_t               xpt_path_path_id(struct cam_path *path);
  97 target_id_t             xpt_path_target_id(struct cam_path *path);
  98 lun_id_t                xpt_path_lun_id(struct cam_path *path);
  99 int                     xpt_path_legacy_ata_id(struct cam_path *path);
 100 struct cam_sim          *xpt_path_sim(struct cam_path *path);
 101 struct cam_periph       *xpt_path_periph(struct cam_path *path);
 102 void                    xpt_async(u_int32_t async_code, struct cam_path *path,
 103                                   void *async_arg);
 104 void                    xpt_rescan(union ccb *ccb);
 105 void                    xpt_hold_boot(void);
 106 void                    xpt_release_boot(void);
 107 void                    xpt_lock_buses(void);
 108 void                    xpt_unlock_buses(void);
 109 cam_status              xpt_register_async(int event, ac_callback_t *cbfunc,
 110                                            void *cbarg, struct cam_path *path);
 111 cam_status              xpt_compile_path(struct cam_path *new_path,
 112                                          struct cam_periph *perph,
 113                                          path_id_t path_id,
 114                                          target_id_t target_id,
 115                                          lun_id_t lun_id);
 116
 117 void                    xpt_release_path(struct cam_path *path);
 118
 119 #endif /* _KERNEL */
 120
 121 #endif /* _CAM_CAM_XPT_H */