1 /* $FreeBSD: releng/12.2/sys/dev/usb/usb_mbuf.c 363664 2020-07-29 14:30:42Z markj $ */ 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 * 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 52 alloc_size = (block_size + sizeof(struct usb_mbuf)) * nblocks; 53 54 free_ptr = zalloc(alloc_size); 55 56 if (free_ptr == NULL) { 57 goto done; 58 } 59 m_ptr = free_ptr; 60 data_ptr = (void *)(m_ptr + nblocks); 61 62 while (nblocks--) { 63 64 m_ptr->cur_data_ptr = 65 m_ptr->min_data_ptr = data_ptr; 66 67 m_ptr->cur_data_len = 68 m_ptr->max_data_len = block_size; 69 70 USB_IF_ENQUEUE(ifq, m_ptr); 71 72 m_ptr++; 73 data_ptr += block_size; 74 } 75 } 76 done: 77 return (free_ptr); 78 } 79