1 /* $FreeBSD: head/sys/dev/usb/usb_mbuf.c 246122 2013-01-30 15:26:04Z hselasky $ */ 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/param.h> 29 #include <sys/queue.h> 30 #include <sys/types.h> 31 #include <sys/systm.h> 32 #include <sys/kernel.h> 33 #include <sys/bus.h> 34 #include <sys/module.h> 35 #include <sys/lock.h> 36 #include <sys/condvar.h> 37 #include <sys/sysctl.h> 38 #include <sys/unistd.h> 39 #include <sys/callout.h> 40 #include <sys/malloc.h> 41 #include <sys/caps.h> 42 43 #include <bus/u4b/usb.h> 44 #include <bus/u4b/usbdi.h> 45 #include <bus/u4b/usb_dev.h> 46 #include <bus/u4b/usb_mbuf.h> 47 48 /*------------------------------------------------------------------------* 49 * usb_alloc_mbufs - allocate mbufs to an usbd interface queue 50 * 51 * Returns: 52 * A pointer that should be passed to "free()" when the buffer(s) 53 * should be released. 54 *------------------------------------------------------------------------*/ 55 void * 56 usb_alloc_mbufs(struct malloc_type *type, struct usb_ifqueue *ifq, 57 usb_size_t block_size, uint16_t nblocks) 58 { 59 struct usb_mbuf *m_ptr; 60 uint8_t *data_ptr; 61 void *free_ptr = NULL; 62 usb_size_t alloc_size; 63 64 /* align data */ 65 block_size += ((-block_size) & (USB_HOST_ALIGN - 1)); 66 67 if (nblocks && block_size) { 68 69 alloc_size = (block_size + sizeof(struct usb_mbuf)) * nblocks; 70 71 free_ptr = kmalloc(alloc_size, type, M_WAITOK | M_ZERO); 72 73 if (free_ptr == NULL) { 74 goto done; 75 } 76 m_ptr = free_ptr; 77 data_ptr = (void *)(m_ptr + nblocks); 78 79 while (nblocks--) { 80 81 m_ptr->cur_data_ptr = 82 m_ptr->min_data_ptr = data_ptr; 83 84 m_ptr->cur_data_len = 85 m_ptr->max_data_len = block_size; 86 87 USB_IF_ENQUEUE(ifq, m_ptr); 88 89 m_ptr++; 90 data_ptr += block_size; 91 } 92 } 93 done: 94 return (free_ptr); 95 } 96