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 #include <cam/cam_xpt.h>
   44 
   45 #define CAM_PATH_ANY (u_int32_t)-1
   46 
   47 static MALLOC_DEFINE(M_CAMSIM, "CAM SIM", "CAM SIM buffers");
   48 
   49 struct cam_devq *
   50 cam_simq_alloc(u_int32_t max_sim_transactions)
   51 {
   52         return (cam_devq_alloc(/*size*/0, max_sim_transactions));
   53 }
   54 
   55 void
   56 cam_simq_free(struct cam_devq *devq)
   57 {
   58         cam_devq_free(devq);
   59 }
   60 
   61 struct cam_sim *
   62 cam_sim_alloc(sim_action_func sim_action, sim_poll_func sim_poll,
   63               const char *sim_name, void *softc, u_int32_t unit,
   64               struct mtx *mtx, int max_dev_transactions,
   65               int max_tagged_dev_transactions, struct cam_devq *queue)
   66 {
   67         struct cam_sim *sim;
   68 
   69         if (mtx == NULL)
   70                 return (NULL);
   71 
   72         sim = (struct cam_sim *)malloc(sizeof(struct cam_sim),
   73             M_CAMSIM, M_ZERO | M_NOWAIT);
   74 
   75         if (sim == NULL)
   76                 return (NULL);
   77 
   78         sim->sim_action = sim_action;
   79         sim->sim_poll = sim_poll;
   80         sim->sim_name = sim_name;
   81         sim->softc = softc;
   82         sim->path_id = CAM_PATH_ANY;
   83         sim->unit_number = unit;
   84         sim->bus_id = 0;        /* set in xpt_bus_register */
   85         sim->max_tagged_dev_openings = max_tagged_dev_transactions;
   86         sim->max_dev_openings = max_dev_transactions;
   87         sim->flags = 0;
   88         sim->refcount = 1;
   89         sim->devq = queue;
   90         sim->max_ccbs = 8;      /* Reserve for management purposes. */
   91         sim->mtx = mtx;
   92         if (mtx == &Giant) {
   93                 sim->flags |= 0;
   94                 callout_init(&sim->callout, 0);
   95         } else {
   96                 sim->flags |= CAM_SIM_MPSAFE;
   97                 callout_init(&sim->callout, 1);
   98         }
   99 
  100         SLIST_INIT(&sim->ccb_freeq);
  101         TAILQ_INIT(&sim->sim_doneq);
  102 
  103         return (sim);
  104 }
  105 
  106 void
  107 cam_sim_free(struct cam_sim *sim, int free_devq)
  108 {
  109         union ccb *ccb;
  110         int error;
  111 
  112         mtx_assert(sim->mtx, MA_OWNED);
  113         sim->refcount--;
  114         if (sim->refcount > 0) {
  115                 error = msleep(sim, sim->mtx, PRIBIO, "simfree", 0);
  116                 KASSERT(error == 0, ("invalid error value for msleep(9)"));
  117         }
  118 
  119         KASSERT(sim->refcount == 0, ("sim->refcount == 0"));
  120 
  121         while ((ccb = (union ccb *)SLIST_FIRST(&sim->ccb_freeq)) != NULL) {
  122                 SLIST_REMOVE_HEAD(&sim->ccb_freeq, xpt_links.sle);
  123                 xpt_free_ccb(ccb);
  124         }
  125         if (free_devq)
  126                 cam_simq_free(sim->devq);
  127         free(sim, M_CAMSIM);
  128 }
  129 
  130 void
  131 cam_sim_release(struct cam_sim *sim)
  132 {
  133         KASSERT(sim->refcount >= 1, ("sim->refcount >= 1"));
  134         mtx_assert(sim->mtx, MA_OWNED);
  135 
  136         sim->refcount--;
  137         if (sim->refcount == 0)
  138                 wakeup(sim);
  139 }
  140 
  141 void
  142 cam_sim_hold(struct cam_sim *sim)
  143 {
  144         KASSERT(sim->refcount >= 1, ("sim->refcount >= 1"));
  145         mtx_assert(sim->mtx, MA_OWNED);
  146 
  147         sim->refcount++;
  148 }
  149 
  150 void
  151 cam_sim_set_path(struct cam_sim *sim, u_int32_t path_id)
  152 {
  153         sim->path_id = path_id;
  154 }

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