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      1 /*	$NetBSD: dmover_request.c,v 1.8 2011/05/14 18:24:47 jakllsch Exp $	*/
      2 
      3 /*
      4  * Copyright (c) 2002 Wasabi Systems, Inc.
      5  * All rights reserved.
      6  *
      7  * Written by Jason R. Thorpe for Wasabi Systems, Inc.
      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  * 2. Redistributions in binary form must reproduce the above copyright
     15  *    notice, this list of conditions and the following disclaimer in the
     16  *    documentation and/or other materials provided with the distribution.
     17  * 3. All advertising materials mentioning features or use of this software
     18  *    must display the following acknowledgement:
     19  *	This product includes software developed for the NetBSD Project by
     20  *	Wasabi Systems, Inc.
     21  * 4. The name of Wasabi Systems, Inc. may not be used to endorse
     22  *    or promote products derived from this software without specific prior
     23  *    written permission.
     24  *
     25  * THIS SOFTWARE IS PROVIDED BY WASABI SYSTEMS, INC. ``AS IS'' AND
     26  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     27  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     28  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL WASABI SYSTEMS, INC
     29  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     30  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     31  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     32  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     33  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     34  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     35  * POSSIBILITY OF SUCH DAMAGE.
     36  */
     37 
     38 /*
     39  * dmover_request.c: Request management functions for dmover-api.
     40  */
     41 
     42 #include <sys/cdefs.h>
     43 __KERNEL_RCSID(0, "$NetBSD: dmover_request.c,v 1.8 2011/05/14 18:24:47 jakllsch Exp $");
     44 
     45 #include <sys/param.h>
     46 #include <sys/pool.h>
     47 #include <sys/systm.h>
     48 #include <sys/malloc.h>
     49 
     50 #include <dev/dmover/dmovervar.h>
     51 
     52 pool_cache_t dmover_request_cache;
     53 
     54 static bool initialized;
     55 
     56 void
     57 dmover_request_initialize(void)
     58 {
     59 
     60 	KASSERT(initialized == false);
     61 
     62 	dmover_request_cache = pool_cache_init(sizeof(struct dmover_request),
     63 		0, 0, 0, "dmreq", NULL, IPL_BIO, NULL, NULL, NULL);
     64 
     65 	initialized = true;
     66 }
     67 
     68 /*
     69  * dmover_request_alloc:	[client interface function]
     70  *
     71  *	Allocate a transform request for the specified session.
     72  */
     73 struct dmover_request *
     74 dmover_request_alloc(struct dmover_session *dses, dmover_buffer *inbuf)
     75 {
     76 	struct dmover_request *dreq;
     77 	int inputs = dses->dses_ninputs;
     78 
     79 	if (__predict_false(initialized == false))
     80 		return (NULL);
     81 
     82 	dreq = pool_cache_get(dmover_request_cache, PR_NOWAIT);
     83 	if (dreq == NULL)
     84 		return (NULL);
     85 
     86 	memset(dreq, 0, sizeof(*dreq));
     87 
     88 	if (inputs != 0) {
     89 		if (inbuf == NULL) {
     90 			inbuf = malloc(sizeof(dmover_buffer) * inputs,
     91 			    M_DEVBUF, M_NOWAIT);
     92 			if (inbuf == NULL) {
     93 				pool_cache_put(dmover_request_cache, dreq);
     94 				return (NULL);
     95 			}
     96 		}
     97 		dreq->dreq_flags |= __DMOVER_REQ_INBUF_FREE;
     98 		dreq->dreq_inbuf = inbuf;
     99 	}
    100 
    101 	dreq->dreq_session = dses;
    102 
    103 	return (dreq);
    104 }
    105 
    106 /*
    107  * dmover_request_free:		[client interface function]
    108  *
    109  *	Free a dmover request.
    110  */
    111 void
    112 dmover_request_free(struct dmover_request *dreq)
    113 {
    114 
    115 	KASSERT(initialized == true);
    116 
    117 	if (dreq->dreq_flags & __DMOVER_REQ_INBUF_FREE)
    118 		free(dreq->dreq_inbuf, M_DEVBUF);
    119 
    120 	pool_cache_put(dmover_request_cache, dreq);
    121 }
    122