FreeBSD/Linux Kernel Cross Reference
sys/dev/dmover/dmover_request.c

     /*      $NetBSD: dmover_request.c,v 1.7 2008/01/04 21:17:52 ad Exp $    */
     
     /*
      * Copyright (c) 2002 Wasabi Systems, Inc.
      * All rights reserved.
      *
      * Written by Jason R. Thorpe for Wasabi Systems, Inc.
      *
      * Redistribution and use in source and binary forms, with or without
     * modification, are permitted provided that the following conditions
     * are met:
     * 1. Redistributions of source code must retain the above copyright
     *    notice, this list of conditions and the following disclaimer.
     * 2. Redistributions in binary form must reproduce the above copyright
     *    notice, this list of conditions and the following disclaimer in the
     *    documentation and/or other materials provided with the distribution.
     * 3. All advertising materials mentioning features or use of this software
     *    must display the following acknowledgement:
     *      This product includes software developed for the NetBSD Project by
     *      Wasabi Systems, Inc.
     * 4. The name of Wasabi Systems, Inc. may not be used to endorse
     *    or promote products derived from this software without specific prior
     *    written permission.
     *
     * THIS SOFTWARE IS PROVIDED BY WASABI SYSTEMS, INC. ``AS IS'' AND
     * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL WASABI SYSTEMS, INC
     * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     * POSSIBILITY OF SUCH DAMAGE.
     */
    
    /*
     * dmover_request.c: Request management functions for dmover-api.
     */
    
    #include <sys/cdefs.h>
    __KERNEL_RCSID(0, "$NetBSD: dmover_request.c,v 1.7 2008/01/04 21:17:52 ad Exp $");
    
    #include <sys/param.h>
    #include <sys/simplelock.h>
    #include <sys/pool.h>
    #include <sys/systm.h>
    #include <sys/malloc.h>
    
    #include <dev/dmover/dmovervar.h>
    
    pool_cache_t dmover_request_cache;
    
    static int initialized;
    static struct simplelock initialized_slock = SIMPLELOCK_INITIALIZER;
    
    void
    dmover_request_initialize(void)
    {
            pool_cache_t pc;
            int s;
    
            if (initialized == 0) {
                    pc = pool_cache_init(sizeof(struct dmover_request), 0, 0, 0,
                            "dmreq", NULL, IPL_BIO, NULL, NULL, NULL);
            } else {
                    pc = NULL;
            }
    
            s = splbio();
            simple_lock(&initialized_slock);
            if (__predict_true(initialized == 0)) {
                    dmover_request_cache = pc;
                    pc = NULL;
                    initialized = 1;
            }
            simple_unlock(&initialized_slock);
            splx(s);
    
            if (pc != NULL)
                    pool_cache_destroy(pc);
    }
    
    /*
     * dmover_request_alloc:        [client interface function]
     *
     *      Allocate a tranform request for the specified session.
     */
    struct dmover_request *
    dmover_request_alloc(struct dmover_session *dses, dmover_buffer *inbuf)
    {
            struct dmover_request *dreq;
            int inputs = dses->dses_ninputs;
    
            if (__predict_false(initialized == 0))
                    return (NULL);
    
            dreq = pool_cache_get(dmover_request_cache, PR_NOWAIT);
           if (dreq == NULL)
                   return (NULL);
   
           memset(dreq, 0, sizeof(*dreq));
   
           if (inputs != 0) {
                   if (inbuf == NULL) {
                           inbuf = malloc(sizeof(dmover_buffer) * inputs,
                               M_DEVBUF, M_NOWAIT);
                           if (inbuf == NULL) {
                                   pool_cache_put(dmover_request_cache, dreq);
                                   return (NULL);
                           }
                   }
                   dreq->dreq_flags |= __DMOVER_REQ_INBUF_FREE;
                   dreq->dreq_inbuf = inbuf;
           }
   
           dreq->dreq_session = dses;
   
           return (dreq);
   }
   
   /*
    * dmover_request_free:         [client interface function]
    *
    *      Free a dmover request.
    */
   void
   dmover_request_free(struct dmover_request *dreq)
   {
   
           if (dreq->dreq_flags & __DMOVER_REQ_INBUF_FREE)
                   free(dreq->dreq_inbuf, M_DEVBUF);
   
           pool_cache_put(dmover_request_cache, dreq);
   }

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