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