usb_mbuf.c revision 188942
1184610Salfred/* $FreeBSD: head/sys/dev/usb/usb_mbuf.c 188942 2009-02-23 18:31:00Z thompsa $ */ 2184610Salfred/*- 3184610Salfred * Copyright (c) 2008 Hans Petter Selasky. All rights reserved. 4184610Salfred * 5184610Salfred * Redistribution and use in source and binary forms, with or without 6184610Salfred * modification, are permitted provided that the following conditions 7184610Salfred * are met: 8184610Salfred * 1. Redistributions of source code must retain the above copyright 9184610Salfred * notice, this list of conditions and the following disclaimer. 10184610Salfred * 2. Redistributions in binary form must reproduce the above copyright 11184610Salfred * notice, this list of conditions and the following disclaimer in the 12184610Salfred * documentation and/or other materials provided with the distribution. 13184610Salfred * 14184610Salfred * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 15184610Salfred * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16184610Salfred * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17184610Salfred * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 18184610Salfred * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19184610Salfred * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20184610Salfred * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21184610Salfred * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22184610Salfred * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23184610Salfred * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24184610Salfred * SUCH DAMAGE. 25184610Salfred */ 26184610Salfred 27188942Sthompsa#include <dev/usb/usb_core.h> 28188942Sthompsa#include <dev/usb/usb_mbuf.h> 29184610Salfred 30184610Salfred/*------------------------------------------------------------------------* 31184610Salfred * usb2_alloc_mbufs - allocate mbufs to an usbd interface queue 32184610Salfred * 33184610Salfred * Returns: 34184610Salfred * A pointer that should be passed to "free()" when the buffer(s) 35184610Salfred * should be released. 36184610Salfred *------------------------------------------------------------------------*/ 37184610Salfredvoid * 38184610Salfredusb2_alloc_mbufs(struct malloc_type *type, struct usb2_ifqueue *ifq, 39184610Salfred uint32_t block_size, uint16_t nblocks) 40184610Salfred{ 41184610Salfred struct usb2_mbuf *m_ptr; 42184610Salfred uint8_t *data_ptr; 43184610Salfred void *free_ptr = NULL; 44184610Salfred uint32_t alloc_size; 45184610Salfred 46184610Salfred /* align data */ 47184610Salfred block_size += ((-block_size) & (USB_HOST_ALIGN - 1)); 48184610Salfred 49184610Salfred if (nblocks && block_size) { 50184610Salfred 51184610Salfred alloc_size = (block_size + sizeof(struct usb2_mbuf)) * nblocks; 52184610Salfred 53184610Salfred free_ptr = malloc(alloc_size, type, M_WAITOK | M_ZERO); 54184610Salfred 55184610Salfred if (free_ptr == NULL) { 56184610Salfred goto done; 57184610Salfred } 58184610Salfred m_ptr = free_ptr; 59184610Salfred data_ptr = (void *)(m_ptr + nblocks); 60184610Salfred 61184610Salfred while (nblocks--) { 62184610Salfred 63184610Salfred m_ptr->cur_data_ptr = 64184610Salfred m_ptr->min_data_ptr = data_ptr; 65184610Salfred 66184610Salfred m_ptr->cur_data_len = 67184610Salfred m_ptr->max_data_len = block_size; 68184610Salfred 69184610Salfred USB_IF_ENQUEUE(ifq, m_ptr); 70184610Salfred 71184610Salfred m_ptr++; 72184610Salfred data_ptr += block_size; 73184610Salfred } 74184610Salfred } 75184610Salfreddone: 76184610Salfred return (free_ptr); 77184610Salfred} 78