xdma_bank.c

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    1 /*-
    2  * Copyright (c) 2018-2019 Ruslan Bukin <br@bsdpad.com>
    3  * All rights reserved.
    4  *
    5  * This software was developed by SRI International and the University of
    6  * Cambridge Computer Laboratory under DARPA/AFRL contract FA8750-10-C-0237
    7  * ("CTSRD"), as part of the DARPA CRASH research programme.
    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  *
   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
   22  * FOR 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 "opt_platform.h"
   35 #include <sys/param.h>
   36 #include <sys/conf.h>
   37 #include <sys/bus.h>
   38 #include <sys/kernel.h>
   39 #include <sys/lock.h>
   40 #include <sys/malloc.h>
   41 #include <sys/mutex.h>
   42 
   43 #include <machine/bus.h>
   44 
   45 #include <dev/xdma/xdma.h>
   46 
   47 void
   48 xchan_bank_init(xdma_channel_t *xchan)
   49 {
   50         struct xdma_request *xr;
   51         int i;
   52 
   53         KASSERT(xchan->xdma != NULL, ("xdma is NULL"));
   54 
   55         xchan->xr_mem = malloc(sizeof(struct xdma_request) * xchan->xr_num,
   56             M_XDMA, M_WAITOK | M_ZERO);
   57 
   58         for (i = 0; i < xchan->xr_num; i++) {
   59                 xr = &xchan->xr_mem[i];
   60                 TAILQ_INSERT_TAIL(&xchan->bank, xr, xr_next);
   61         }
   62 }
   63 
   64 int
   65 xchan_bank_free(xdma_channel_t *xchan)
   66 {
   67 
   68         free(xchan->xr_mem, M_XDMA);
   69 
   70         return (0);
   71 }
   72 
   73 struct xdma_request *
   74 xchan_bank_get(xdma_channel_t *xchan)
   75 {
   76         struct xdma_request *xr;
   77         struct xdma_request *xr_tmp;
   78 
   79         QUEUE_BANK_LOCK(xchan);
   80         TAILQ_FOREACH_SAFE(xr, &xchan->bank, xr_next, xr_tmp) {
   81                 TAILQ_REMOVE(&xchan->bank, xr, xr_next);
   82                 break;
   83         }
   84         QUEUE_BANK_UNLOCK(xchan);
   85 
   86         return (xr);
   87 }
   88 
   89 int
   90 xchan_bank_put(xdma_channel_t *xchan, struct xdma_request *xr)
   91 {
   92 
   93         QUEUE_BANK_LOCK(xchan);
   94         TAILQ_INSERT_TAIL(&xchan->bank, xr, xr_next);
   95         QUEUE_BANK_UNLOCK(xchan);
   96 
   97         return (0);
   98 }

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FreeBSD/Linux Kernel Cross Reference sys/dev/xdma/xdma_bank.c

FreeBSD/Linux Kernel Cross Reference
sys/dev/xdma/xdma_bank.c