cam_sim.c

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    1 /*-
    2  * Common functions for SCSI Interface Modules (SIMs).
    3  *
    4  * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
    5  *
    6  * Copyright (c) 1997 Justin T. Gibbs.
    7  * All rights reserved.
    8  *
    9  * Redistribution and use in source and binary forms, with or without
   10  * modification, are permitted provided that the following conditions
   11  * are met:
   12  * 1. Redistributions of source code must retain the above copyright
   13  *    notice, this list of conditions, and the following disclaimer,
   14  *    without modification, immediately at the beginning of the file.
   15  * 2. The name of the author may not be used to endorse or promote products
   16  *    derived from this software without specific prior written permission.
   17  *
   18  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   19  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   20  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   21  * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR
   22  * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   23  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   24  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   25  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   26  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   27  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   28  * SUCH DAMAGE.
   29  */
   30 
   31 #include <sys/cdefs.h>
   32 __FBSDID("$FreeBSD$");
   33 
   34 #include <sys/param.h>
   35 #include <sys/systm.h>
   36 #include <sys/malloc.h>
   37 #include <sys/kernel.h>
   38 #include <sys/lock.h>
   39 #include <sys/mutex.h>
   40 #include <sys/bus.h>
   41 
   42 #include <cam/cam.h>
   43 #include <cam/cam_ccb.h>
   44 #include <cam/cam_sim.h>
   45 #include <cam/cam_queue.h>
   46 #include <cam/cam_xpt.h>
   47 
   48 #define CAM_PATH_ANY (u_int32_t)-1
   49 
   50 static MALLOC_DEFINE(M_CAMSIM, "CAM SIM", "CAM SIM buffers");
   51 
   52 static struct mtx cam_sim_free_mtx;
   53 MTX_SYSINIT(cam_sim_free_init, &cam_sim_free_mtx, "CAM SIM free lock", MTX_DEF);
   54 
   55 struct cam_devq *
   56 cam_simq_alloc(u_int32_t max_sim_transactions)
   57 {
   58         return (cam_devq_alloc(/*size*/0, max_sim_transactions));
   59 }
   60 
   61 void
   62 cam_simq_free(struct cam_devq *devq)
   63 {
   64         cam_devq_free(devq);
   65 }
   66 
   67 struct cam_sim *
   68 cam_sim_alloc(sim_action_func sim_action, sim_poll_func sim_poll,
   69               const char *sim_name, void *softc, u_int32_t unit,
   70               struct mtx *mtx, int max_dev_transactions,
   71               int max_tagged_dev_transactions, struct cam_devq *queue)
   72 {
   73         struct cam_sim *sim;
   74 
   75         sim = malloc(sizeof(struct cam_sim), M_CAMSIM, M_ZERO | M_NOWAIT);
   76         if (sim == NULL)
   77                 return (NULL);
   78 
   79         sim->sim_action = sim_action;
   80         sim->sim_poll = sim_poll;
   81         sim->sim_name = sim_name;
   82         sim->softc = softc;
   83         sim->path_id = CAM_PATH_ANY;
   84         sim->sim_dev = NULL;    /* set only by cam_sim_alloc_dev */
   85         sim->unit_number = unit;
   86         sim->bus_id = 0;        /* set in xpt_bus_register */
   87         sim->max_tagged_dev_openings = max_tagged_dev_transactions;
   88         sim->max_dev_openings = max_dev_transactions;
   89         sim->flags = 0;
   90         sim->refcount = 1;
   91         sim->devq = queue;
   92         sim->mtx = mtx;
   93         callout_init(&sim->callout, 1);
   94         return (sim);
   95 }
   96 
   97 struct cam_sim *
   98 cam_sim_alloc_dev(sim_action_func sim_action, sim_poll_func sim_poll,
   99               const char *sim_name, void *softc, device_t dev,
  100               struct mtx *mtx, int max_dev_transactions,
  101               int max_tagged_dev_transactions, struct cam_devq *queue)
  102 {
  103         struct cam_sim *sim;
  104 
  105         KASSERT(dev != NULL, ("%s: dev is null for sim_name %s softc %p\n",
  106             __func__, sim_name, softc));
  107 
  108         sim = cam_sim_alloc(sim_action, sim_poll, sim_name, softc,
  109             device_get_unit(dev), mtx, max_dev_transactions,
  110             max_tagged_dev_transactions, queue);
  111         if (sim != NULL)
  112                 sim->sim_dev = dev;
  113         return (sim);
  114 }
  115 
  116 void
  117 cam_sim_free(struct cam_sim *sim, int free_devq)
  118 {
  119         struct mtx *mtx;
  120         int error;
  121 
  122         if (sim->mtx == NULL) {
  123                 mtx = &cam_sim_free_mtx;
  124                 mtx_lock(mtx);
  125         } else {
  126                 mtx = sim->mtx;
  127                 mtx_assert(mtx, MA_OWNED);
  128         }
  129         KASSERT(sim->refcount >= 1, ("sim->refcount >= 1"));
  130         sim->refcount--;
  131         if (sim->refcount > 0) {
  132                 error = msleep(sim, mtx, PRIBIO, "simfree", 0);
  133                 KASSERT(error == 0, ("invalid error value for msleep(9)"));
  134         }
  135         KASSERT(sim->refcount == 0, ("sim->refcount == 0"));
  136         if (mtx == &cam_sim_free_mtx)   /* sim->mtx == NULL */
  137                 mtx_unlock(mtx);
  138 
  139         if (free_devq)
  140                 cam_simq_free(sim->devq);
  141         free(sim, M_CAMSIM);
  142 }
  143 
  144 void
  145 cam_sim_release(struct cam_sim *sim)
  146 {
  147         struct mtx *mtx;
  148 
  149         if (sim->mtx == NULL)
  150                 mtx = &cam_sim_free_mtx;
  151         else if (!mtx_owned(sim->mtx))
  152                 mtx = sim->mtx;
  153         else
  154                 mtx = NULL;     /* We hold the lock. */
  155         if (mtx)
  156                 mtx_lock(mtx);
  157         KASSERT(sim->refcount >= 1, ("sim->refcount >= 1"));
  158         sim->refcount--;
  159         if (sim->refcount == 0)
  160                 wakeup(sim);
  161         if (mtx)
  162                 mtx_unlock(mtx);
  163 }
  164 
  165 void
  166 cam_sim_hold(struct cam_sim *sim)
  167 {
  168         struct mtx *mtx;
  169 
  170         if (sim->mtx == NULL)
  171                 mtx = &cam_sim_free_mtx;
  172         else if (!mtx_owned(sim->mtx))
  173                 mtx = sim->mtx;
  174         else
  175                 mtx = NULL;     /* We hold the lock. */
  176         if (mtx)
  177                 mtx_lock(mtx);
  178         KASSERT(sim->refcount >= 1, ("sim->refcount >= 1"));
  179         sim->refcount++;
  180         if (mtx)
  181                 mtx_unlock(mtx);
  182 }
  183 
  184 void
  185 cam_sim_set_path(struct cam_sim *sim, u_int32_t path_id)
  186 {
  187         sim->path_id = path_id;
  188 }

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

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