1 /* 2 * Copyright (c) 2005, 2006, 2007, 2008 Mellanox Technologies. All rights reserved. 3 * Copyright (c) 2006, 2007 Cisco Systems, Inc. All rights reserved. 4 * 5 * This software is available to you under a choice of one of two 6 * licenses. You may choose to be licensed under the terms of the GNU 7 * General Public License (GPL) Version 2, available from the file 8 * COPYING in the main directory of this source tree, or the 9 * OpenIB.org BSD license below: 10 * 11 * Redistribution and use in source and binary forms, with or 12 * without modification, are permitted provided that the following 13 * conditions are met: 14 * 15 * - Redistributions of source code must retain the above 16 * copyright notice, this list of conditions and the following 17 * disclaimer. 18 * 19 * - Redistributions in binary form must reproduce the above 20 * copyright notice, this list of conditions and the following 21 * disclaimer in the documentation and/or other materials 22 * provided with the distribution. 23 * 24 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, 25 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF 26 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND 27 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS 28 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN 29 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN 30 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE 31 * SOFTWARE. 32 */ 33 34 #ifndef MLX4_ICM_H 35 #define MLX4_ICM_H 36 37 #include <linux/list.h> 38 #include <linux/pci.h> 39 #include <linux/mutex.h> 40 41 #define MLX4_ICM_CHUNK_LEN \ 42 ((256 - sizeof(struct list_head) - 2 * sizeof(int)) / \ 43 (sizeof(struct scatterlist))) 44 45 enum { 46 MLX4_ICM_PAGE_SHIFT = 12, 47 MLX4_ICM_PAGE_SIZE = 1 << MLX4_ICM_PAGE_SHIFT, 48 }; 49 50 struct mlx4_icm_buf { 51 void *addr; 52 size_t size; 53 dma_addr_t dma_addr; 54 }; 55 56 struct mlx4_icm_chunk { 57 struct list_head list; 58 int npages; 59 int nsg; 60 bool coherent; 61 union { 62 struct scatterlist sg[MLX4_ICM_CHUNK_LEN]; 63 struct mlx4_icm_buf buf[MLX4_ICM_CHUNK_LEN]; 64 }; 65 }; 66 67 struct mlx4_icm { 68 struct list_head chunk_list; 69 int refcount; 70 }; 71 72 struct mlx4_icm_iter { 73 struct mlx4_icm *icm; 74 struct mlx4_icm_chunk *chunk; 75 int page_idx; 76 }; 77 78 struct mlx4_dev; 79 80 struct mlx4_icm *mlx4_alloc_icm(struct mlx4_dev *dev, int npages, 81 gfp_t gfp_mask, int coherent); 82 void mlx4_free_icm(struct mlx4_dev *dev, struct mlx4_icm *icm, int coherent); 83 84 int mlx4_table_get(struct mlx4_dev *dev, struct mlx4_icm_table *table, u32 obj); 85 void mlx4_table_put(struct mlx4_dev *dev, struct mlx4_icm_table *table, u32 obj); 86 int mlx4_table_get_range(struct mlx4_dev *dev, struct mlx4_icm_table *table, 87 u32 start, u32 end); 88 void mlx4_table_put_range(struct mlx4_dev *dev, struct mlx4_icm_table *table, 89 u32 start, u32 end); 90 int mlx4_init_icm_table(struct mlx4_dev *dev, struct mlx4_icm_table *table, 91 u64 virt, int obj_size, u32 nobj, int reserved, 92 int use_lowmem, int use_coherent); 93 void mlx4_cleanup_icm_table(struct mlx4_dev *dev, struct mlx4_icm_table *table); 94 void *mlx4_table_find(struct mlx4_icm_table *table, u32 obj, dma_addr_t *dma_handle); 95 96 static inline void mlx4_icm_first(struct mlx4_icm *icm, 97 struct mlx4_icm_iter *iter) 98 { 99 iter->icm = icm; 100 iter->chunk = list_empty(&icm->chunk_list) ? 101 NULL : list_entry(icm->chunk_list.next, 102 struct mlx4_icm_chunk, list); 103 iter->page_idx = 0; 104 } 105 106 static inline int mlx4_icm_last(struct mlx4_icm_iter *iter) 107 { 108 return !iter->chunk; 109 } 110 111 static inline void mlx4_icm_next(struct mlx4_icm_iter *iter) 112 { 113 if (++iter->page_idx >= iter->chunk->nsg) { 114 if (iter->chunk->list.next == &iter->icm->chunk_list) { 115 iter->chunk = NULL; 116 return; 117 } 118 119 iter->chunk = list_entry(iter->chunk->list.next, 120 struct mlx4_icm_chunk, list); 121 iter->page_idx = 0; 122 } 123 } 124 125 static inline dma_addr_t mlx4_icm_addr(struct mlx4_icm_iter *iter) 126 { 127 if (iter->chunk->coherent) 128 return iter->chunk->buf[iter->page_idx].dma_addr; 129 else 130 return sg_dma_address(&iter->chunk->sg[iter->page_idx]); 131 } 132 133 static inline unsigned long mlx4_icm_size(struct mlx4_icm_iter *iter) 134 { 135 if (iter->chunk->coherent) 136 return iter->chunk->buf[iter->page_idx].size; 137 else 138 return sg_dma_len(&iter->chunk->sg[iter->page_idx]); 139 } 140 141 int mlx4_MAP_ICM_AUX(struct mlx4_dev *dev, struct mlx4_icm *icm); 142 int mlx4_UNMAP_ICM_AUX(struct mlx4_dev *dev); 143 144 #endif /* MLX4_ICM_H */ 145