Shachar Raindel | 8ada2c1 | 2014-12-11 17:04:17 +0200 | [diff] [blame^] | 1 | /* |
| 2 | * Copyright (c) 2014 Mellanox Technologies. 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_ODP_H |
| 34 | #define IB_UMEM_ODP_H |
| 35 | |
| 36 | #include <rdma/ib_umem.h> |
| 37 | |
| 38 | struct ib_umem_odp { |
| 39 | /* |
| 40 | * An array of the pages included in the on-demand paging umem. |
| 41 | * Indices of pages that are currently not mapped into the device will |
| 42 | * contain NULL. |
| 43 | */ |
| 44 | struct page **page_list; |
| 45 | /* |
| 46 | * An array of the same size as page_list, with DMA addresses mapped |
| 47 | * for pages the pages in page_list. The lower two bits designate |
| 48 | * access permissions. See ODP_READ_ALLOWED_BIT and |
| 49 | * ODP_WRITE_ALLOWED_BIT. |
| 50 | */ |
| 51 | dma_addr_t *dma_list; |
| 52 | /* |
| 53 | * The umem_mutex protects the page_list and dma_list fields of an ODP |
| 54 | * umem, allowing only a single thread to map/unmap pages. |
| 55 | */ |
| 56 | struct mutex umem_mutex; |
| 57 | void *private; /* for the HW driver to use. */ |
| 58 | }; |
| 59 | |
| 60 | #ifdef CONFIG_INFINIBAND_ON_DEMAND_PAGING |
| 61 | |
| 62 | int ib_umem_odp_get(struct ib_ucontext *context, struct ib_umem *umem); |
| 63 | |
| 64 | void ib_umem_odp_release(struct ib_umem *umem); |
| 65 | |
| 66 | /* |
| 67 | * The lower 2 bits of the DMA address signal the R/W permissions for |
| 68 | * the entry. To upgrade the permissions, provide the appropriate |
| 69 | * bitmask to the map_dma_pages function. |
| 70 | * |
| 71 | * Be aware that upgrading a mapped address might result in change of |
| 72 | * the DMA address for the page. |
| 73 | */ |
| 74 | #define ODP_READ_ALLOWED_BIT (1<<0ULL) |
| 75 | #define ODP_WRITE_ALLOWED_BIT (1<<1ULL) |
| 76 | |
| 77 | #define ODP_DMA_ADDR_MASK (~(ODP_READ_ALLOWED_BIT | ODP_WRITE_ALLOWED_BIT)) |
| 78 | |
| 79 | int ib_umem_odp_map_dma_pages(struct ib_umem *umem, u64 start_offset, u64 bcnt, |
| 80 | u64 access_mask, unsigned long current_seq); |
| 81 | |
| 82 | void ib_umem_odp_unmap_dma_pages(struct ib_umem *umem, u64 start_offset, |
| 83 | u64 bound); |
| 84 | |
| 85 | #else /* CONFIG_INFINIBAND_ON_DEMAND_PAGING */ |
| 86 | |
| 87 | static inline int ib_umem_odp_get(struct ib_ucontext *context, |
| 88 | struct ib_umem *umem) |
| 89 | { |
| 90 | return -EINVAL; |
| 91 | } |
| 92 | |
| 93 | static inline void ib_umem_odp_release(struct ib_umem *umem) {} |
| 94 | |
| 95 | #endif /* CONFIG_INFINIBAND_ON_DEMAND_PAGING */ |
| 96 | |
| 97 | #endif /* IB_UMEM_ODP_H */ |