The Design and Implementation of the FreeBSD Operating System, Second Edition
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FreeBSD/Linux Kernel Cross Reference
sys/cam/cam_queue.h

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    1 /*-
    2  * CAM request queue management definitions.
    3  *
    4  * Copyright (c) 1997 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  * $FreeBSD$
   29  */
   30 
   31 #ifndef _CAM_CAM_QUEUE_H
   32 #define _CAM_CAM_QUEUE_H 1
   33 
   34 #ifdef _KERNEL
   35 
   36 #include <sys/queue.h>
   37 
   38 /*
   39  * This structure implements a heap based priority queue.  The queue
   40  * assumes that the objects stored in it begin with a cam_qentry
   41  * structure holding the priority information used to sort the objects.
   42  * This structure is opaque to clients (outside of the XPT layer) to allow
   43  * the implementation to change without affecting them.
   44  */
   45 struct camq {
   46         cam_pinfo **queue_array;
   47         int        array_size;
   48         int        entries;
   49         u_int32_t  generation;
   50         u_int32_t  qfrozen_cnt;
   51 };
   52 
   53 TAILQ_HEAD(ccb_hdr_tailq, ccb_hdr);
   54 LIST_HEAD(ccb_hdr_list, ccb_hdr);
   55 SLIST_HEAD(ccb_hdr_slist, ccb_hdr);
   56 
   57 struct cam_ccbq {
   58         struct  camq queue;
   59         int     devq_openings;
   60         int     dev_openings;   
   61         int     dev_active;
   62         int     held;
   63         struct  ccb_hdr_tailq active_ccbs;
   64 };
   65 
   66 struct cam_ed;
   67 
   68 struct cam_devq {
   69         struct  camq alloc_queue;
   70         struct  camq send_queue;
   71         struct  cam_ed *active_dev;
   72         int     alloc_openings;
   73         int     alloc_active;
   74         int     send_openings;
   75         int     send_active;
   76 };
   77 
   78 
   79 struct cam_devq *cam_devq_alloc(int devices, int openings);
   80 
   81 int              cam_devq_init(struct cam_devq *devq, int devices,
   82                                int openings);
   83 
   84 void             cam_devq_free(struct cam_devq *devq);
   85 
   86 u_int32_t        cam_devq_resize(struct cam_devq *camq, int openings);
   87         
   88 /*
   89  * Allocate a cam_ccb_queue structure and initialize it.
   90  */
   91 struct cam_ccbq *cam_ccbq_alloc(int openings);
   92 
   93 u_int32_t       cam_ccbq_resize(struct cam_ccbq *ccbq, int devices);
   94 
   95 int             cam_ccbq_init(struct cam_ccbq *ccbq, int openings);
   96 
   97 void            cam_ccbq_free(struct cam_ccbq *ccbq);
   98 
   99 void            cam_ccbq_fini(struct cam_ccbq *ccbq);
  100 
  101 /*
  102  * Allocate and initialize a cam_queue structure.
  103  */
  104 struct camq     *camq_alloc(int size);
  105 
  106 /*
  107  * Resize a cam queue
  108  */
  109 u_int32_t       camq_resize(struct camq *queue, int new_size);
  110 
  111 /* 
  112  * Initialize a camq structure.  Return 0 on success, 1 on failure.
  113  */
  114 int             camq_init(struct camq *camq, int size);
  115 
  116 /*
  117  * Free a cam_queue structure.  This should only be called if a controller
  118  * driver failes somehow during its attach routine or is unloaded and has
  119  * obtained a cam_queue structure.
  120  */
  121 void            camq_free(struct camq *queue);
  122 
  123 /*
  124  * Finialize any internal storage or state of a cam_queue.
  125  */
  126 void            camq_fini(struct camq *queue);
  127 
  128 /*
  129  * cam_queue_insert: Given a CAM queue with at least one open spot,
  130  * insert the new entry maintaining order.
  131  */
  132 void            camq_insert(struct camq *queue, cam_pinfo *new_entry);
  133 
  134 /*
  135  * camq_remove: Remove and arbitrary entry from the queue maintaining
  136  * queue order.
  137  */
  138 cam_pinfo       *camq_remove(struct camq *queue, int index);
  139 #define CAMQ_HEAD 1     /* Head of queue index */
  140 
  141 /* Index the first element in the heap */
  142 #define CAMQ_GET_HEAD(camq) ((camq)->queue_array[CAMQ_HEAD])
  143 
  144 /*
  145  * camq_change_priority: Raise or lower the priority of an entry
  146  * maintaining queue order.
  147  */
  148 void            camq_change_priority(struct camq *queue, int index,
  149                                      u_int32_t new_priority);
  150 
  151 static __inline int
  152 cam_ccbq_pending_ccb_count(struct cam_ccbq *ccbq);
  153 
  154 static __inline void
  155 cam_ccbq_take_opening(struct cam_ccbq *ccbq);
  156 
  157 static __inline void
  158 cam_ccbq_insert_ccb(struct cam_ccbq *ccbq, union ccb *new_ccb);
  159 
  160 static __inline void
  161 cam_ccbq_remove_ccb(struct cam_ccbq *ccbq, union ccb *ccb);
  162 
  163 static __inline union ccb *
  164 cam_ccbq_peek_ccb(struct cam_ccbq *ccbq, int index);
  165 
  166 static __inline void
  167 cam_ccbq_send_ccb(struct cam_ccbq *queue, union ccb *send_ccb);
  168 
  169 static __inline void
  170 cam_ccbq_ccb_done(struct cam_ccbq *ccbq, union ccb *done_ccb);
  171 
  172 static __inline void
  173 cam_ccbq_release_opening(struct cam_ccbq *ccbq);
  174 
  175 
  176 static __inline int
  177 cam_ccbq_pending_ccb_count(struct cam_ccbq *ccbq)
  178 {
  179         return (ccbq->queue.entries);
  180 }
  181 
  182 static __inline void
  183 cam_ccbq_take_opening(struct cam_ccbq *ccbq)
  184 {
  185         ccbq->devq_openings--;
  186         ccbq->held++;
  187 }
  188 
  189 static __inline void
  190 cam_ccbq_insert_ccb(struct cam_ccbq *ccbq, union ccb *new_ccb)
  191 {
  192         ccbq->held--;
  193         camq_insert(&ccbq->queue, &new_ccb->ccb_h.pinfo);
  194 }
  195 
  196 static __inline void
  197 cam_ccbq_remove_ccb(struct cam_ccbq *ccbq, union ccb *ccb)
  198 {
  199         camq_remove(&ccbq->queue, ccb->ccb_h.pinfo.index);
  200 }
  201 
  202 static __inline union ccb *
  203 cam_ccbq_peek_ccb(struct cam_ccbq *ccbq, int index)
  204 {
  205         return((union ccb *)ccbq->queue.queue_array[index]);
  206 }
  207 
  208 static __inline void
  209 cam_ccbq_send_ccb(struct cam_ccbq *ccbq, union ccb *send_ccb)
  210 {
  211 
  212         TAILQ_INSERT_TAIL(&ccbq->active_ccbs,
  213                           &(send_ccb->ccb_h),
  214                           xpt_links.tqe);
  215         send_ccb->ccb_h.pinfo.index = CAM_ACTIVE_INDEX;
  216         ccbq->dev_active++;
  217         ccbq->dev_openings--;           
  218 }
  219 
  220 static __inline void
  221 cam_ccbq_ccb_done(struct cam_ccbq *ccbq, union ccb *done_ccb)
  222 {
  223         TAILQ_REMOVE(&ccbq->active_ccbs, &done_ccb->ccb_h,
  224                      xpt_links.tqe);
  225         ccbq->dev_active--;
  226         ccbq->dev_openings++;   
  227         ccbq->held++;
  228 }
  229 
  230 static __inline void
  231 cam_ccbq_release_opening(struct cam_ccbq *ccbq)
  232 {
  233         ccbq->held--;
  234         ccbq->devq_openings++;
  235 }
  236 
  237 #endif /* _KERNEL */
  238 #endif  /* _CAM_CAM_QUEUE_H */

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