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 struct vm_area_struct; 43 44 struct ib_umem { 45 struct ib_ucontext *context; 46 size_t length; 47 int offset; 48 int page_size; 49 int writable; 50 int hugetlb; 51 struct list_head chunk_list; 52 #ifdef __linux__ 53 struct work_struct work; 54 struct mm_struct *mm; 55 #else 56 unsigned long start; 57 #endif 58 unsigned long diff; 59 }; 60 61 struct ib_cmem { 62 63 struct ib_ucontext *context; 64 size_t length; 65 /* Link list of contiguous blocks being part of that cmem */ 66 struct list_head ib_cmem_block; 67 68 /* Order of cmem block, 2^ block_order will equal number 69 of physical pages per block 70 */ 71 unsigned long block_order; 72 /* Refernce counter for that memory area 73 - When value became 0 pages will be returned to the kernel. 74 */ 75 struct kref refcount; 76 }; 77 78 79 struct ib_umem_chunk { 80 struct list_head list; 81 int nents; 82 int nmap; 83 struct dma_attrs attrs; 84 struct scatterlist page_list[0]; 85 }; 86 87 struct ib_umem *ib_umem_get(struct ib_ucontext *context, unsigned long addr, 88 size_t size, int access, int dmasync); 89 void ib_umem_release(struct ib_umem *umem); 90 int ib_umem_page_count(struct ib_umem *umem); 91 92 int ib_cmem_map_contiguous_pages_to_vma(struct ib_cmem *ib_cmem, 93 struct vm_area_struct *vma); 94 struct ib_cmem *ib_cmem_alloc_contiguous_pages(struct ib_ucontext *context, 95 unsigned long total_size, 96 unsigned long page_size_order); 97 void ib_cmem_release_contiguous_pages(struct ib_cmem *cmem); 98 int ib_umem_map_to_vma(struct ib_umem *umem, 99 struct vm_area_struct *vma); 100 101 102 #endif /* IB_UMEM_H */ 103