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 40 struct ib_ucontext; 41 struct ib_umem_odp; 42 43 struct ib_umem { 44 struct ib_ucontext *context; 45 size_t length; 46 unsigned long address; 47 int page_shift; 48 int writable; 49 int hugetlb; 50 struct work_struct work; 51 struct pid *pid; 52 struct mm_struct *mm; 53 unsigned long diff; 54 struct ib_umem_odp *odp_data; 55 struct sg_table sg_head; 56 int nmap; 57 int npages; 58 }; 59 60 /* Returns the offset of the umem start relative to the first page. */ 61 static inline int ib_umem_offset(struct ib_umem *umem) 62 { 63 return umem->address & (BIT(umem->page_shift) - 1); 64 } 65 66 /* Returns the first page of an ODP umem. */ 67 static inline unsigned long ib_umem_start(struct ib_umem *umem) 68 { 69 return umem->address - ib_umem_offset(umem); 70 } 71 72 /* Returns the address of the page after the last one of an ODP umem. */ 73 static inline unsigned long ib_umem_end(struct ib_umem *umem) 74 { 75 return ALIGN(umem->address + umem->length, BIT(umem->page_shift)); 76 } 77 78 static inline size_t ib_umem_num_pages(struct ib_umem *umem) 79 { 80 return (ib_umem_end(umem) - ib_umem_start(umem)) >> umem->page_shift; 81 } 82 83 #ifdef CONFIG_INFINIBAND_USER_MEM 84 85 struct ib_umem *ib_umem_get(struct ib_ucontext *context, unsigned long addr, 86 size_t size, int access, int dmasync); 87 void ib_umem_release(struct ib_umem *umem); 88 int ib_umem_page_count(struct ib_umem *umem); 89 int ib_umem_copy_from(void *dst, struct ib_umem *umem, size_t offset, 90 size_t length); 91 92 #else /* CONFIG_INFINIBAND_USER_MEM */ 93 94 #include <linux/err.h> 95 96 static inline struct ib_umem *ib_umem_get(struct ib_ucontext *context, 97 unsigned long addr, size_t size, 98 int access, int dmasync) { 99 return ERR_PTR(-EINVAL); 100 } 101 static inline void ib_umem_release(struct ib_umem *umem) { } 102 static inline int ib_umem_page_count(struct ib_umem *umem) { return 0; } 103 static inline int ib_umem_copy_from(void *dst, struct ib_umem *umem, size_t offset, 104 size_t length) { 105 return -EINVAL; 106 } 107 #endif /* CONFIG_INFINIBAND_USER_MEM */ 108 109 #endif /* IB_UMEM_H */ 110