1 /* 2 * Copyright (c) 2007 Cisco Systems. All rights reserved. 3 * 4 * This software is available to you under a choice of one of two 5 * licenses. You may choose to be licensed under the terms of the GNU 6 * General Public License (GPL) Version 2, available from the file 7 * COPYING in the main directory of this source tree, or the 8 * OpenIB.org BSD license below: 9 * 10 * Redistribution and use in source and binary forms, with or 11 * without modification, are permitted provided that the following 12 * conditions are met: 13 * 14 * - Redistributions of source code must retain the above 15 * copyright notice, this list of conditions and the following 16 * disclaimer. 17 * 18 * - Redistributions in binary form must reproduce the above 19 * copyright notice, this list of conditions and the following 20 * disclaimer in the documentation and/or other materials 21 * provided with the distribution. 22 * 23 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, 24 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF 25 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND 26 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS 27 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN 28 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN 29 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE 30 * SOFTWARE. 31 */ 32 33 #ifndef IB_UMEM_H 34 #define IB_UMEM_H 35 36 #include <linux/list.h> 37 #include <linux/scatterlist.h> 38 #include <linux/workqueue.h> 39 #include <linux/dma-attrs.h> 40 41 struct ib_ucontext; 42 43 struct ib_umem { 44 struct ib_ucontext *context; 45 size_t length; 46 int offset; 47 int page_size; 48 int writable; 49 int hugetlb; 50 struct list_head chunk_list; 51 #ifdef __linux__ 52 struct work_struct work; 53 struct mm_struct *mm; 54 #else 55 unsigned long start; 56 #endif 57 unsigned long diff; 58 }; 59 60 struct ib_cmem { 61 62 struct ib_ucontext *context; 63 size_t length; 64 /* Link list of contiguous blocks being part of that cmem */ 65 struct list_head ib_cmem_block; 66 67 /* Order of cmem block, 2^ block_order will equal number 68 of physical pages per block 69 */ 70 unsigned long block_order; 71 /* Refernce counter for that memory area 72 - When value became 0 pages will be returned to the kernel. 73 */ 74 struct kref refcount; 75 }; 76 77 78 struct ib_umem_chunk { 79 struct list_head list; 80 int nents; 81 int nmap; 82 struct dma_attrs attrs; 83 struct scatterlist page_list[0]; 84 }; 85 86 struct ib_umem *ib_umem_get(struct ib_ucontext *context, unsigned long addr, 87 size_t size, int access, int dmasync); 88 void ib_umem_release(struct ib_umem *umem); 89 int ib_umem_page_count(struct ib_umem *umem); 90 91 int ib_cmem_map_contiguous_pages_to_vma(struct ib_cmem *ib_cmem, 92 struct vm_area_struct *vma); 93 struct ib_cmem *ib_cmem_alloc_contiguous_pages(struct ib_ucontext *context, 94 unsigned long total_size, 95 unsigned long page_size_order); 96 void ib_cmem_release_contiguous_pages(struct ib_cmem *cmem); 97 int ib_umem_map_to_vma(struct ib_umem *umem, 98 struct vm_area_struct *vma); 99 100 101 #endif /* IB_UMEM_H */ 102