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.c

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    1 /*-
    2  * Common functions 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 
   29 #include <sys/cdefs.h>
   30 __FBSDID("$FreeBSD$");
   31 
   32 #include <sys/param.h>
   33 #include <sys/systm.h>
   34 #include <sys/malloc.h>
   35 #include <sys/kernel.h>
   36 #include <sys/lock.h>
   37 #include <sys/mutex.h>
   38 
   39 #include <cam/cam.h>
   40 #include <cam/cam_ccb.h>
   41 #include <cam/cam_sim.h>
   42 #include <cam/cam_queue.h>
   43 
   44 #define CAM_PATH_ANY (u_int32_t)-1
   45 
   46 MALLOC_DEFINE(M_CAMSIM, "CAM SIM", "CAM SIM buffers");
   47 
   48 struct cam_devq *
   49 cam_simq_alloc(u_int32_t max_sim_transactions)
   50 {
   51         return (cam_devq_alloc(/*size*/0, max_sim_transactions));
   52 }
   53 
   54 void
   55 cam_simq_free(struct cam_devq *devq)
   56 {
   57         cam_devq_free(devq);
   58 }
   59 
   60 struct cam_sim *
   61 cam_sim_alloc(sim_action_func sim_action, sim_poll_func sim_poll,
   62               const char *sim_name, void *softc, u_int32_t unit,
   63               struct mtx *mtx, int max_dev_transactions,
   64               int max_tagged_dev_transactions, struct cam_devq *queue)
   65 {
   66         struct cam_sim *sim;
   67 
   68         if (mtx == NULL)
   69                 return (NULL);
   70 
   71         sim = (struct cam_sim *)malloc(sizeof(struct cam_sim),
   72             M_CAMSIM, M_NOWAIT);
   73 
   74         if (sim == NULL)
   75                 return (NULL);
   76 
   77         sim->sim_action = sim_action;
   78         sim->sim_poll = sim_poll;
   79         sim->sim_name = sim_name;
   80         sim->softc = softc;
   81         sim->path_id = CAM_PATH_ANY;
   82         sim->unit_number = unit;
   83         sim->bus_id = 0;        /* set in xpt_bus_register */
   84         sim->max_tagged_dev_openings = max_tagged_dev_transactions;
   85         sim->max_dev_openings = max_dev_transactions;
   86         sim->flags = 0;
   87         sim->devq = queue;
   88         sim->mtx = mtx;
   89         if (mtx == &Giant) {
   90                 sim->flags |= 0;
   91                 callout_init(&sim->callout, 0);
   92         } else {
   93                 sim->flags |= CAM_SIM_MPSAFE;
   94                 callout_init(&sim->callout, 1);
   95         }
   96 
   97         SLIST_INIT(&sim->ccb_freeq);
   98         TAILQ_INIT(&sim->sim_doneq);
   99 
  100         return (sim);
  101 }
  102 
  103 void
  104 cam_sim_free(struct cam_sim *sim, int free_devq)
  105 {
  106         if (free_devq)
  107                 cam_simq_free(sim->devq);
  108         free(sim, M_CAMSIM);
  109 }
  110 
  111 void
  112 cam_sim_set_path(struct cam_sim *sim, u_int32_t path_id)
  113 {
  114         sim->path_id = path_id;
  115 }

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