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: releng/11.2/sys/cam/cam_sim.c 316498 2017-04-04 17:59:10Z mav $");
   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 static struct mtx cam_sim_free_mtx;
   50 MTX_SYSINIT(cam_sim_free_init, &cam_sim_free_mtx, "CAM SIM free lock", MTX_DEF);
   51 
   52 struct cam_devq *
   53 cam_simq_alloc(u_int32_t max_sim_transactions)
   54 {
   55         return (cam_devq_alloc(/*size*/0, max_sim_transactions));
   56 }
   57 
   58 void
   59 cam_simq_free(struct cam_devq *devq)
   60 {
   61         cam_devq_free(devq);
   62 }
   63 
   64 struct cam_sim *
   65 cam_sim_alloc(sim_action_func sim_action, sim_poll_func sim_poll,
   66               const char *sim_name, void *softc, u_int32_t unit,
   67               struct mtx *mtx, int max_dev_transactions,
   68               int max_tagged_dev_transactions, struct cam_devq *queue)
   69 {
   70         struct cam_sim *sim;
   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->mtx = mtx;
   91         if (mtx == &Giant) {
   92                 sim->flags |= 0;
   93                 callout_init(&sim->callout, 0);
   94         } else {
   95                 sim->flags |= CAM_SIM_MPSAFE;
   96                 callout_init(&sim->callout, 1);
   97         }
   98         return (sim);
   99 }
  100 
  101 void
  102 cam_sim_free(struct cam_sim *sim, int free_devq)
  103 {
  104         struct mtx *mtx = sim->mtx;
  105         int error;
  106 
  107         if (mtx) {
  108                 mtx_assert(mtx, MA_OWNED);
  109         } else {
  110                 mtx = &cam_sim_free_mtx;
  111                 mtx_lock(mtx);
  112         }
  113         sim->refcount--;
  114         if (sim->refcount > 0) {
  115                 error = msleep(sim, mtx, PRIBIO, "simfree", 0);
  116                 KASSERT(error == 0, ("invalid error value for msleep(9)"));
  117         }
  118         KASSERT(sim->refcount == 0, ("sim->refcount == 0"));
  119         if (sim->mtx == NULL)
  120                 mtx_unlock(mtx);
  121 
  122         if (free_devq)
  123                 cam_simq_free(sim->devq);
  124         free(sim, M_CAMSIM);
  125 }
  126 
  127 void
  128 cam_sim_release(struct cam_sim *sim)
  129 {
  130         struct mtx *mtx = sim->mtx;
  131 
  132         if (mtx) {
  133                 if (!mtx_owned(mtx))
  134                         mtx_lock(mtx);
  135                 else
  136                         mtx = NULL;
  137         } else {
  138                 mtx = &cam_sim_free_mtx;
  139                 mtx_lock(mtx);
  140         }
  141         KASSERT(sim->refcount >= 1, ("sim->refcount >= 1"));
  142         sim->refcount--;
  143         if (sim->refcount == 0)
  144                 wakeup(sim);
  145         if (mtx)
  146                 mtx_unlock(mtx);
  147 }
  148 
  149 void
  150 cam_sim_hold(struct cam_sim *sim)
  151 {
  152         struct mtx *mtx = sim->mtx;
  153 
  154         if (mtx) {
  155                 if (!mtx_owned(mtx))
  156                         mtx_lock(mtx);
  157                 else
  158                         mtx = NULL;
  159         } else {
  160                 mtx = &cam_sim_free_mtx;
  161                 mtx_lock(mtx);
  162         }
  163         KASSERT(sim->refcount >= 1, ("sim->refcount >= 1"));
  164         sim->refcount++;
  165         if (mtx)
  166                 mtx_unlock(mtx);
  167 }
  168 
  169 void
  170 cam_sim_set_path(struct cam_sim *sim, u_int32_t path_id)
  171 {
  172         sim->path_id = path_id;
  173 }

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