usb_mbuf.c revision 194677 
1/* $FreeBSD: head/sys/dev/usb/usb_mbuf.c 194677 2009-06-23 02:19:59Z thompsa $ */
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/linker_set.h>
36#include <sys/module.h>
37#include <sys/lock.h>
38#include <sys/mutex.h>
39#include <sys/condvar.h>
40#include <sys/sysctl.h>
41#include <sys/sx.h>
42#include <sys/unistd.h>
43#include <sys/callout.h>
44#include <sys/malloc.h>
45#include <sys/priv.h>
46
47#include <dev/usb/usb.h>
48#include <dev/usb/usbdi.h>
49#include <dev/usb/usb_dev.h>
50#include <dev/usb/usb_mbuf.h>
51
52/*------------------------------------------------------------------------*
53 *      usb_alloc_mbufs - allocate mbufs to an usbd interface queue
54 *
55 * Returns:
56 *   A pointer that should be passed to "free()" when the buffer(s)
57 *   should be released.
58 *------------------------------------------------------------------------*/
59void   *
60usb_alloc_mbufs(struct malloc_type *type, struct usb_ifqueue *ifq,
61    usb_size_t block_size, uint16_t nblocks)
62{
63	struct usb_mbuf *m_ptr;
64	uint8_t *data_ptr;
65	void *free_ptr = NULL;
66	usb_size_t alloc_size;
67
68	/* align data */
69	block_size += ((-block_size) & (USB_HOST_ALIGN - 1));
70
71	if (nblocks && block_size) {
72
73		alloc_size = (block_size + sizeof(struct usb_mbuf)) * nblocks;
74
75		free_ptr = malloc(alloc_size, type, M_WAITOK | M_ZERO);
76
77		if (free_ptr == NULL) {
78			goto done;
79		}
80		m_ptr = free_ptr;
81		data_ptr = (void *)(m_ptr + nblocks);
82
83		while (nblocks--) {
84
85			m_ptr->cur_data_ptr =
86			    m_ptr->min_data_ptr = data_ptr;
87
88			m_ptr->cur_data_len =
89			    m_ptr->max_data_len = block_size;
90
91			USB_IF_ENQUEUE(ifq, m_ptr);
92
93			m_ptr++;
94			data_ptr += block_size;
95		}
96	}
97done:
98	return (free_ptr);
99}
100