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 45enum { 46 MLX4_ICM_PAGE_SHIFT = 12, 47 MLX4_ICM_PAGE_SIZE = 1 << MLX4_ICM_PAGE_SHIFT, 48}; 49 50struct mlx4_icm_chunk { 51 struct list_head list; 52 int npages; 53 int nsg; 54 struct scatterlist mem[MLX4_ICM_CHUNK_LEN]; 55}; 56 57struct mlx4_icm { 58 struct list_head chunk_list; 59 int refcount; 60}; 61 62struct mlx4_icm_iter { 63 struct mlx4_icm *icm; 64 struct mlx4_icm_chunk *chunk; 65 int page_idx; 66}; 67 68struct mlx4_dev; 69 70struct mlx4_icm *mlx4_alloc_icm(struct mlx4_dev *dev, int npages, 71 gfp_t gfp_mask, int coherent); 72void mlx4_free_icm(struct mlx4_dev *dev, struct mlx4_icm *icm, int coherent); 73 74int mlx4_table_get(struct mlx4_dev *dev, struct mlx4_icm_table *table, u32 obj); 75void mlx4_table_put(struct mlx4_dev *dev, struct mlx4_icm_table *table, u32 obj); 76int mlx4_table_get_range(struct mlx4_dev *dev, struct mlx4_icm_table *table, 77 u32 start, u32 end); 78void mlx4_table_put_range(struct mlx4_dev *dev, struct mlx4_icm_table *table, 79 u32 start, u32 end); 80int 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); 83void mlx4_cleanup_icm_table(struct mlx4_dev *dev, struct mlx4_icm_table *table); 84void *mlx4_table_find(struct mlx4_icm_table *table, u32 obj, dma_addr_t *dma_handle); 85 86static 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 96static inline int mlx4_icm_last(struct mlx4_icm_iter *iter) 97{ 98 return !iter->chunk; 99} 100 101static 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 115static 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 120static inline unsigned long mlx4_icm_size(struct mlx4_icm_iter *iter) 121{ 122 return sg_dma_len(&iter->chunk->mem[iter->page_idx]); 123} 124 125 126#endif /* MLX4_ICM_H */ 127