The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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

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    1 /*-
    2  * Data structures and definitions for SCSI Interface Modules (SIMs).
    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_SIM_H
   32 #define _CAM_CAM_SIM_H 1
   33 
   34 #ifdef _KERNEL
   35 
   36 /*
   37  * The sim driver creates a sim for each controller.  The sim device
   38  * queue is separately created in order to allow resource sharing between
   39  * sims.  For instance, a driver may create one sim for each channel of
   40  * a multi-channel controller and use the same queue for each channel.
   41  * In this way, the queue resources are shared across all the channels
   42  * of the multi-channel controller.
   43  */
   44 
   45 struct cam_sim;
   46 struct cam_devq;
   47 
   48 typedef void (*sim_action_func)(struct cam_sim *sim, union ccb *ccb);
   49 typedef void (*sim_poll_func)(struct cam_sim *sim);
   50 
   51 struct cam_devq * cam_simq_alloc(u_int32_t max_sim_transactions);
   52 void              cam_simq_free(struct cam_devq *devq);
   53 
   54 struct cam_sim *  cam_sim_alloc(sim_action_func sim_action,
   55                                 sim_poll_func sim_poll,
   56                                 const char *sim_name,
   57                                 void *softc,
   58                                 u_int32_t unit,
   59                                 struct mtx *mtx,
   60                                 int max_dev_transactions,
   61                                 int max_tagged_dev_transactions,
   62                                 struct cam_devq *queue);
   63 void              cam_sim_free(struct cam_sim *sim, int free_devq);
   64 
   65 /* Optional sim attributes may be set with these. */
   66 void    cam_sim_set_path(struct cam_sim *sim, u_int32_t path_id);
   67 
   68 
   69 
   70 /* Convenience routines for accessing sim attributes. */
   71 static __inline u_int32_t    cam_sim_path(struct cam_sim *sim);
   72 static __inline const char * cam_sim_name(struct cam_sim *sim);
   73 static __inline void *       cam_sim_softc(struct cam_sim *sim);
   74 static __inline u_int32_t    cam_sim_unit(struct cam_sim *sim);
   75 static __inline u_int32_t    cam_sim_bus(struct cam_sim *sim);
   76 
   77 
   78 
   79 /* Generically useful offsets into the sim private area */
   80 #define spriv_ptr0 sim_priv.entries[0].ptr
   81 #define spriv_ptr1 sim_priv.entries[1].ptr
   82 #define spriv_field0 sim_priv.entries[0].field
   83 #define spriv_field1 sim_priv.entries[1].field
   84 
   85 /*
   86  * The sim driver should not access anything directly from this
   87  * structure.
   88  */
   89 struct cam_sim {
   90         sim_action_func         sim_action;
   91         sim_poll_func           sim_poll;
   92         const char              *sim_name;
   93         void                    *softc;
   94         struct mtx              *mtx;
   95         TAILQ_HEAD(, ccb_hdr)   sim_doneq;
   96         TAILQ_ENTRY(cam_sim)    links;
   97         u_int32_t               path_id;/* The Boot device may set this to 0? */
   98         u_int32_t               unit_number;
   99         u_int32_t               bus_id;
  100         int                     max_tagged_dev_openings;
  101         int                     max_dev_openings;
  102         u_int32_t               flags;
  103 #define CAM_SIM_REL_TIMEOUT_PENDING     0x01
  104 #define CAM_SIM_MPSAFE                  0x02
  105 #define CAM_SIM_ON_DONEQ                0x04
  106         struct callout          callout;
  107         struct cam_devq         *devq;  /* Device Queue to use for this SIM */
  108 
  109         /* "Pool" of inactive ccbs managed by xpt_alloc_ccb and xpt_free_ccb */
  110         SLIST_HEAD(,ccb_hdr)    ccb_freeq;
  111         /*
  112          * Maximum size of ccb pool.  Modified as devices are added/removed
  113          * or have their * opening counts changed.
  114          */
  115         u_int                   max_ccbs;
  116         /* Current count of allocated ccbs */
  117         u_int                   ccb_count;
  118 
  119 };
  120 
  121 #define CAM_SIM_LOCK(sim)       mtx_lock((sim)->mtx);
  122 #define CAM_SIM_UNLOCK(sim)     mtx_unlock((sim)->mtx);
  123 
  124 static __inline u_int32_t
  125 cam_sim_path(struct cam_sim *sim)
  126 {
  127         return (sim->path_id);
  128 }
  129 
  130 static __inline const char *
  131 cam_sim_name(struct cam_sim *sim)
  132 {
  133         return (sim->sim_name);
  134 }
  135 
  136 static __inline void *
  137 cam_sim_softc(struct cam_sim *sim)
  138 {
  139         return (sim->softc);
  140 }
  141 
  142 static __inline u_int32_t
  143 cam_sim_unit(struct cam_sim *sim)
  144 {
  145         return (sim->unit_number);
  146 }
  147 
  148 static __inline u_int32_t
  149 cam_sim_bus(struct cam_sim *sim)
  150 {
  151         return (sim->bus_id);
  152 }
  153 
  154 #endif /* _KERNEL */
  155 #endif /* _CAM_CAM_SIM_H */

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