1 /* 2 * Copyright (c) 2005, 2006, 2007, 2008, 2014 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 #include <linux/scatterlist.h> 41 42 #define MLX4_ICM_CHUNK_LEN \ 43 ((256 - sizeof (struct list_head) - 2 * sizeof (int)) / \ 44 (sizeof (struct scatterlist))) 45 46 enum { 47 MLX4_ICM_PAGE_SHIFT = 12, 48 MLX4_ICM_PAGE_SIZE = 1 << MLX4_ICM_PAGE_SHIFT, 49 }; 50 51 struct mlx4_icm_chunk { 52 struct list_head list; 53 int npages; 54 int nsg; 55 struct scatterlist mem[MLX4_ICM_CHUNK_LEN]; 56 }; 57 58 struct mlx4_icm { 59 struct list_head chunk_list; 60 int refcount; 61 }; 62 63 struct mlx4_icm_iter { 64 struct mlx4_icm *icm; 65 struct mlx4_icm_chunk *chunk; 66 int page_idx; 67 }; 68 69 struct mlx4_dev; 70 71 struct mlx4_icm *mlx4_alloc_icm(struct mlx4_dev *dev, int npages, 72 gfp_t gfp_mask, int coherent); 73 void mlx4_free_icm(struct mlx4_dev *dev, struct mlx4_icm *icm, int coherent); 74 75 int mlx4_table_get(struct mlx4_dev *dev, struct mlx4_icm_table *table, u32 obj, 76 gfp_t gfp); 77 void mlx4_table_put(struct mlx4_dev *dev, struct mlx4_icm_table *table, u32 obj); 78 int mlx4_table_get_range(struct mlx4_dev *dev, struct mlx4_icm_table *table, 79 u32 start, u32 end); 80 void mlx4_table_put_range(struct mlx4_dev *dev, struct mlx4_icm_table *table, 81 u32 start, u32 end); 82 int mlx4_init_icm_table(struct mlx4_dev *dev, struct mlx4_icm_table *table, 83 u64 virt, int obj_size, u32 nobj, int reserved, 84 int use_lowmem, int use_coherent); 85 void mlx4_cleanup_icm_table(struct mlx4_dev *dev, struct mlx4_icm_table *table); 86 void *mlx4_table_find(struct mlx4_icm_table *table, u32 obj, dma_addr_t *dma_handle); 87 88 static inline void mlx4_icm_first(struct mlx4_icm *icm, 89 struct mlx4_icm_iter *iter) 90 { 91 iter->icm = icm; 92 iter->chunk = list_empty(&icm->chunk_list) ? 93 NULL : list_entry(icm->chunk_list.next, 94 struct mlx4_icm_chunk, list); 95 iter->page_idx = 0; 96 } 97 98 static inline int mlx4_icm_last(struct mlx4_icm_iter *iter) 99 { 100 return !iter->chunk; 101 } 102 103 static inline void mlx4_icm_next(struct mlx4_icm_iter *iter) 104 { 105 if (++iter->page_idx >= iter->chunk->nsg) { 106 if (iter->chunk->list.next == &iter->icm->chunk_list) { 107 iter->chunk = NULL; 108 return; 109 } 110 111 iter->chunk = list_entry(iter->chunk->list.next, 112 struct mlx4_icm_chunk, list); 113 iter->page_idx = 0; 114 } 115 } 116 117 static inline dma_addr_t mlx4_icm_addr(struct mlx4_icm_iter *iter) 118 { 119 return sg_dma_address(&iter->chunk->mem[iter->page_idx]); 120 } 121 122 static inline unsigned long mlx4_icm_size(struct mlx4_icm_iter *iter) 123 { 124 return sg_dma_len(&iter->chunk->mem[iter->page_idx]); 125 } 126 127 #endif /* MLX4_ICM_H */ 128