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_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(struct ccb_hdr *ccb_h,
  74                                       struct cam_path *path,
  75                                       u_int32_t priority);
  76 void                    xpt_merge_ccb(union ccb *master_ccb,
  77                                       union ccb *slave_ccb);
  78 cam_status              xpt_create_path(struct cam_path **new_path_ptr,
  79                                         struct cam_periph *perph,
  80                                         path_id_t path_id,
  81                                         target_id_t target_id, lun_id_t lun_id);
  82 cam_status              xpt_create_path_unlocked(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 int                     xpt_getattr(char *buf, size_t len, const char *attr,
  87                                     struct cam_path *path);
  88 void                    xpt_free_path(struct cam_path *path);
  89 void                    xpt_path_counts(struct cam_path *path, uint32_t *bus_ref,
  90                                         uint32_t *periph_ref, uint32_t *target_ref,
  91                                         uint32_t *device_ref);
  92 int                     xpt_path_comp(struct cam_path *path1,
  93                                       struct cam_path *path2);
  94 int                     xpt_path_comp_dev(struct cam_path *path,
  95                                           struct cam_ed *dev);
  96 void                    xpt_print_path(struct cam_path *path);
  97 void                    xpt_print_device(struct cam_ed *device);
  98 void                    xpt_print(struct cam_path *path, const char *fmt, ...);
  99 int                     xpt_path_string(struct cam_path *path, char *str,
 100                                         size_t str_len);
 101 path_id_t               xpt_path_path_id(struct cam_path *path);
 102 target_id_t             xpt_path_target_id(struct cam_path *path);
 103 lun_id_t                xpt_path_lun_id(struct cam_path *path);
 104 int                     xpt_path_legacy_ata_id(struct cam_path *path);
 105 struct cam_sim          *xpt_path_sim(struct cam_path *path);
 106 struct cam_periph       *xpt_path_periph(struct cam_path *path);
 107 void                    xpt_async(u_int32_t async_code, struct cam_path *path,
 108                                   void *async_arg);
 109 void                    xpt_rescan(union ccb *ccb);
 110 void                    xpt_hold_boot(void);
 111 void                    xpt_release_boot(void);
 112 void                    xpt_lock_buses(void);
 113 void                    xpt_unlock_buses(void);
 114 struct mtx *            xpt_path_mtx(struct cam_path *path);
 115 #define xpt_path_lock(path)     mtx_lock(xpt_path_mtx(path))
 116 #define xpt_path_unlock(path)   mtx_unlock(xpt_path_mtx(path))
 117 #define xpt_path_assert(path, what)     mtx_assert(xpt_path_mtx(path), (what))
 118 #define xpt_path_owned(path)    mtx_owned(xpt_path_mtx(path))
 119 #define xpt_path_sleep(path, chan, priority, wmesg, timo)               \
 120     msleep((chan), xpt_path_mtx(path), (priority), (wmesg), (timo))
 121 cam_status              xpt_register_async(int event, ac_callback_t *cbfunc,
 122                                            void *cbarg, struct cam_path *path);
 123 cam_status              xpt_compile_path(struct cam_path *new_path,
 124                                          struct cam_periph *perph,
 125                                          path_id_t path_id,
 126                                          target_id_t target_id,
 127                                          lun_id_t lun_id);
 128 cam_status              xpt_clone_path(struct cam_path **new_path,
 129                                       struct cam_path *path);
 130 void                    xpt_copy_path(struct cam_path *new_path,
 131                                       struct cam_path *path);
 132
 133 void                    xpt_release_path(struct cam_path *path);
 134
 135 #endif /* _KERNEL */
 136
 137 #endif /* _CAM_CAM_XPT_H */