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: releng/11.2/sys/cam/cam_sim.h 256843 2013-10-21 12:00:26Z mav $
   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 void              cam_sim_hold(struct cam_sim *sim);
   65 void              cam_sim_release(struct cam_sim *sim);
   66 
   67 /* Optional sim attributes may be set with these. */
   68 void    cam_sim_set_path(struct cam_sim *sim, u_int32_t path_id);
   69 
   70 
   71 
   72 /* Convenience routines for accessing sim attributes. */
   73 static __inline u_int32_t    cam_sim_path(struct cam_sim *sim);
   74 static __inline const char * cam_sim_name(struct cam_sim *sim);
   75 static __inline void *       cam_sim_softc(struct cam_sim *sim);
   76 static __inline u_int32_t    cam_sim_unit(struct cam_sim *sim);
   77 static __inline u_int32_t    cam_sim_bus(struct cam_sim *sim);
   78 
   79 
   80 
   81 /* Generically useful offsets into the sim private area */
   82 #define spriv_ptr0 sim_priv.entries[0].ptr
   83 #define spriv_ptr1 sim_priv.entries[1].ptr
   84 #define spriv_field0 sim_priv.entries[0].field
   85 #define spriv_field1 sim_priv.entries[1].field
   86 
   87 /*
   88  * The sim driver should not access anything directly from this
   89  * structure.
   90  */
   91 struct cam_sim {
   92         sim_action_func         sim_action;
   93         sim_poll_func           sim_poll;
   94         const char              *sim_name;
   95         void                    *softc;
   96         struct mtx              *mtx;
   97         TAILQ_HEAD(, ccb_hdr)   sim_doneq;
   98         TAILQ_ENTRY(cam_sim)    links;
   99         u_int32_t               path_id;/* The Boot device may set this to 0? */
  100         u_int32_t               unit_number;
  101         u_int32_t               bus_id;
  102         int                     max_tagged_dev_openings;
  103         int                     max_dev_openings;
  104         u_int32_t               flags;
  105 #define CAM_SIM_REL_TIMEOUT_PENDING     0x01
  106 #define CAM_SIM_MPSAFE                  0x02
  107         struct callout          callout;
  108         struct cam_devq         *devq;  /* Device Queue to use for this SIM */
  109         int                     refcount; /* References to the SIM. */
  110 };
  111 
  112 #define CAM_SIM_LOCK(sim)       mtx_lock((sim)->mtx)
  113 #define CAM_SIM_UNLOCK(sim)     mtx_unlock((sim)->mtx)
  114 
  115 static __inline u_int32_t
  116 cam_sim_path(struct cam_sim *sim)
  117 {
  118         return (sim->path_id);
  119 }
  120 
  121 static __inline const char *
  122 cam_sim_name(struct cam_sim *sim)
  123 {
  124         return (sim->sim_name);
  125 }
  126 
  127 static __inline void *
  128 cam_sim_softc(struct cam_sim *sim)
  129 {
  130         return (sim->softc);
  131 }
  132 
  133 static __inline u_int32_t
  134 cam_sim_unit(struct cam_sim *sim)
  135 {
  136         return (sim->unit_number);
  137 }
  138 
  139 static __inline u_int32_t
  140 cam_sim_bus(struct cam_sim *sim)
  141 {
  142         return (sim->bus_id);
  143 }
  144 
  145 #endif /* _KERNEL */
  146 #endif /* _CAM_CAM_SIM_H */

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