xref: /freebsd/sys/dev/usb/usb_mbuf.c (revision 39beb93c3f8bdbf72a61fda42300b5ebed7390c8)
1 /* $FreeBSD$ */
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 <dev/usb/usb_core.h>
28 #include <dev/usb/usb_mbuf.h>
29 
30 /*------------------------------------------------------------------------*
31  *      usb2_alloc_mbufs - allocate mbufs to an usbd interface queue
32  *
33  * Returns:
34  *   A pointer that should be passed to "free()" when the buffer(s)
35  *   should be released.
36  *------------------------------------------------------------------------*/
37 void   *
38 usb2_alloc_mbufs(struct malloc_type *type, struct usb2_ifqueue *ifq,
39     uint32_t block_size, uint16_t nblocks)
40 {
41 	struct usb2_mbuf *m_ptr;
42 	uint8_t *data_ptr;
43 	void *free_ptr = NULL;
44 	uint32_t alloc_size;
45 
46 	/* align data */
47 	block_size += ((-block_size) & (USB_HOST_ALIGN - 1));
48 
49 	if (nblocks && block_size) {
50 
51 		alloc_size = (block_size + sizeof(struct usb2_mbuf)) * nblocks;
52 
53 		free_ptr = malloc(alloc_size, type, M_WAITOK | M_ZERO);
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