usb_mbuf.c

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    1 /* $FreeBSD: releng/8.3/sys/dev/usb/usb_mbuf.c 221125 2011-04-27 18:00:46Z jhb $ */
    2 /*-
    3  * Copyright (c) 2008 Hans Petter Selasky. All rights reserved.
    4  *
    5  * Redistribution and use in source and binary forms, with or without
    6  * modification, are permitted provided that the following conditions
    7  * are met:
    8  * 1. Redistributions of source code must retain the above copyright
    9  *    notice, this list of conditions and the following disclaimer.
   10  * 2. Redistributions in binary form must reproduce the above copyright
   11  *    notice, this list of conditions and the following disclaimer in the
   12  *    documentation and/or other materials provided with the distribution.
   13  *
   14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   15  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   17  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   18  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   19  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   20  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   21  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   22  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   23  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   24  * SUCH DAMAGE.
   25  */
   26 
   27 #include <sys/stdint.h>
   28 #include <sys/stddef.h>
   29 #include <sys/param.h>
   30 #include <sys/queue.h>
   31 #include <sys/types.h>
   32 #include <sys/systm.h>
   33 #include <sys/kernel.h>
   34 #include <sys/bus.h>
   35 #include <sys/module.h>
   36 #include <sys/lock.h>
   37 #include <sys/mutex.h>
   38 #include <sys/condvar.h>
   39 #include <sys/sysctl.h>
   40 #include <sys/sx.h>
   41 #include <sys/unistd.h>
   42 #include <sys/callout.h>
   43 #include <sys/malloc.h>
   44 #include <sys/priv.h>
   45 
   46 #include <dev/usb/usb.h>
   47 #include <dev/usb/usbdi.h>
   48 #include <dev/usb/usb_dev.h>
   49 #include <dev/usb/usb_mbuf.h>
   50 
   51 /*------------------------------------------------------------------------*
   52  *      usb_alloc_mbufs - allocate mbufs to an usbd interface queue
   53  *
   54  * Returns:
   55  *   A pointer that should be passed to "free()" when the buffer(s)
   56  *   should be released.
   57  *------------------------------------------------------------------------*/
   58 void   *
   59 usb_alloc_mbufs(struct malloc_type *type, struct usb_ifqueue *ifq,
   60     usb_size_t block_size, uint16_t nblocks)
   61 {
   62         struct usb_mbuf *m_ptr;
   63         uint8_t *data_ptr;
   64         void *free_ptr = NULL;
   65         usb_size_t alloc_size;
   66 
   67         /* align data */
   68         block_size += ((-block_size) & (USB_HOST_ALIGN - 1));
   69 
   70         if (nblocks && block_size) {
   71 
   72                 alloc_size = (block_size + sizeof(struct usb_mbuf)) * nblocks;
   73 
   74                 free_ptr = malloc(alloc_size, type, M_WAITOK | M_ZERO);
   75 
   76                 if (free_ptr == NULL) {
   77                         goto done;
   78                 }
   79                 m_ptr = free_ptr;
   80                 data_ptr = (void *)(m_ptr + nblocks);
   81 
   82                 while (nblocks--) {
   83 
   84                         m_ptr->cur_data_ptr =
   85                             m_ptr->min_data_ptr = data_ptr;
   86 
   87                         m_ptr->cur_data_len =
   88                             m_ptr->max_data_len = block_size;
   89 
   90                         USB_IF_ENQUEUE(ifq, m_ptr);
   91 
   92                         m_ptr++;
   93                         data_ptr += block_size;
   94                 }
   95         }
   96 done:
   97         return (free_ptr);
   98 }

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FreeBSD/Linux Kernel Cross Reference sys/dev/usb/usb_mbuf.c

FreeBSD/Linux Kernel Cross Reference
sys/dev/usb/usb_mbuf.c