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

     /*-
      * Copyright (c) 2017-2019 Ruslan Bukin <br@bsdpad.com>
      * All rights reserved.
      *
      * This software was developed by SRI International and the University of
      * Cambridge Computer Laboratory under DARPA/AFRL contract FA8750-10-C-0237
      * ("CTSRD"), as part of the DARPA CRASH research programme.
      *
      * 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.
     *
     * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``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 THE AUTHOR OR CONTRIBUTORS 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.
     */
    
    #include <sys/cdefs.h>
    __FBSDID("$FreeBSD$");
    
    #include "opt_platform.h"
    #include <sys/param.h>
    #include <sys/conf.h>
    #include <sys/bus.h>
    #include <sys/kernel.h>
    #include <sys/lock.h>
    #include <sys/mbuf.h>
    #include <sys/mutex.h>
    
    #include <machine/bus.h>
    
    #ifdef FDT
    #include <dev/fdt/fdt_common.h>
    #include <dev/ofw/ofw_bus.h>
    #include <dev/ofw/ofw_bus_subr.h>
    #endif
    
    #include <dev/xdma/xdma.h>
    
    int
    xdma_dequeue_mbuf(xdma_channel_t *xchan, struct mbuf **mp,
        xdma_transfer_status_t *status)
    {
            struct xdma_request *xr;
            struct xdma_request *xr_tmp;
    
            QUEUE_OUT_LOCK(xchan);
            TAILQ_FOREACH_SAFE(xr, &xchan->queue_out, xr_next, xr_tmp) {
                    TAILQ_REMOVE(&xchan->queue_out, xr, xr_next);
                    break;
            }
            QUEUE_OUT_UNLOCK(xchan);
    
            if (xr == NULL)
                    return (-1);
    
            *mp = xr->m;
            status->error = xr->status.error;
            status->transferred = xr->status.transferred;
    
            xchan_bank_put(xchan, xr);
    
            return (0);
    }
    
    int
    xdma_enqueue_mbuf(xdma_channel_t *xchan, struct mbuf **mp,
        uintptr_t addr, uint8_t src_width, uint8_t dst_width,
        enum xdma_direction dir)
    {
            struct xdma_request *xr;
    
            xr = xchan_bank_get(xchan);
            if (xr == NULL)
                    return (-1); /* No space is available yet. */
    
            xr->direction = dir;
            xr->m = *mp;
            xr->req_type = XR_TYPE_MBUF;
            if (dir == XDMA_MEM_TO_DEV) {
                    xr->dst_addr = addr;
                    xr->src_addr = 0;
            } else {
                    xr->src_addr = addr;
                    xr->dst_addr = 0;
            }
           xr->src_width = src_width;
           xr->dst_width = dst_width;
   
           QUEUE_IN_LOCK(xchan);
           TAILQ_INSERT_TAIL(&xchan->queue_in, xr, xr_next);
           QUEUE_IN_UNLOCK(xchan);
   
           return (0);
   }
   
   uint32_t
   xdma_mbuf_chain_count(struct mbuf *m0)
   {
           struct mbuf *m;
           uint32_t c;
   
           c = 0;
   
           for (m = m0; m != NULL; m = m->m_next)
                   c++;
   
           return (c);
   }
   
   uint32_t
   xdma_mbuf_defrag(xdma_channel_t *xchan, struct xdma_request *xr)
   {
           xdma_controller_t *xdma;
           struct mbuf *m;
           uint32_t c;
   
           xdma = xchan->xdma;
   
           c = xdma_mbuf_chain_count(xr->m);
           if (c == 1)
                   return (c); /* Nothing to do. */
   
           if ((m = m_defrag(xr->m, M_NOWAIT)) == NULL) {
                   device_printf(xdma->dma_dev,
                       "%s: Can't defrag mbuf\n",
                       __func__);
                   return (c);
           }
   
           xr->m = m;
           c = 1;
   
           return (c);
   }

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