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/5.2/sys/cam/cam_sim.c 116161 2003-06-10 17:50:20Z obrien $");
   31 
   32 #include <sys/param.h>
   33 #include <sys/systm.h>
   34 #include <sys/malloc.h>
   35 
   36 #include <cam/cam.h>
   37 #include <cam/cam_ccb.h>
   38 #include <cam/cam_sim.h>
   39 #include <cam/cam_queue.h>
   40 
   41 #define CAM_PATH_ANY (u_int32_t)-1
   42 
   43 struct cam_devq *
   44 cam_simq_alloc(u_int32_t max_sim_transactions)
   45 {
   46         return (cam_devq_alloc(/*size*/0, max_sim_transactions));
   47 }
   48 
   49 void
   50 cam_simq_free(struct cam_devq *devq)
   51 {
   52         cam_devq_free(devq);
   53 }
   54 
   55 struct cam_sim *
   56 cam_sim_alloc(sim_action_func sim_action, sim_poll_func sim_poll,
   57               const char *sim_name, void *softc, u_int32_t unit,
   58               int max_dev_transactions,
   59               int max_tagged_dev_transactions, struct cam_devq *queue)
   60 {
   61         struct cam_sim *sim;
   62 
   63         /*
   64          * If this is the xpt layer creating a sim, then it's OK
   65          * to wait for an allocation.
   66          *
   67          * XXX Should we pass in a flag to indicate that wait is OK?
   68          */
   69         if (strcmp(sim_name, "xpt") == 0)
   70                 sim = (struct cam_sim *)malloc(sizeof(struct cam_sim),
   71                                                M_DEVBUF, M_WAITOK);
   72         else
   73                 sim = (struct cam_sim *)malloc(sizeof(struct cam_sim),
   74                                                M_DEVBUF, M_NOWAIT);
   75 
   76         if (sim != NULL) {
   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                 callout_handle_init(&sim->c_handle);
   88                 sim->devq = queue;
   89         }
   90 
   91         return (sim);
   92 }
   93 
   94 void
   95 cam_sim_free(struct cam_sim *sim, int free_devq)
   96 {
   97         if (free_devq)
   98                 cam_simq_free(sim->devq);
   99         free(sim, M_DEVBUF);
  100 }
  101 
  102 void
  103 cam_sim_set_path(struct cam_sim *sim, u_int32_t path_id)
  104 {
  105         sim->path_id = path_id;
  106 }

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