xref: /freebsd/sys/dev/usb/usb_mbuf.c (revision 7aa383846770374466b1dcb2cefd71bde9acf463)
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 <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  *------------------------------------------------------------------------*/
59 void   *
60 usb_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 	}
97 done:
98 	return (free_ptr);
99 }
100