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