| 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 */ |