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 46enum { 47 MLX4_ICM_PAGE_SHIFT = 12, 48 MLX4_ICM_PAGE_SIZE = 1 << MLX4_ICM_PAGE_SHIFT, 49}; 50 51struct mlx4_icm_chunk { 52 struct list_head list; 53 int npages; 54 int nsg; 55 struct scatterlist mem[MLX4_ICM_CHUNK_LEN]; 56}; 57 58struct mlx4_icm { 59 struct list_head chunk_list; 60 int refcount; 61}; 62 63struct mlx4_icm_iter { 64 struct mlx4_icm *icm; 65 struct mlx4_icm_chunk *chunk; 66 int page_idx; 67}; 68 69struct mlx4_dev; 70 71struct mlx4_icm *mlx4_alloc_icm(struct mlx4_dev *dev, int npages, 72 gfp_t gfp_mask, int coherent); 73void mlx4_free_icm(struct mlx4_dev *dev, struct mlx4_icm *icm, int coherent); 74 75int mlx4_table_get(struct mlx4_dev *dev, struct mlx4_icm_table *table, u32 obj); 76void mlx4_table_put(struct mlx4_dev *dev, struct mlx4_icm_table *table, u32 obj); 77int mlx4_table_get_range(struct mlx4_dev *dev, struct mlx4_icm_table *table, 78 u32 start, u32 end); 79void mlx4_table_put_range(struct mlx4_dev *dev, struct mlx4_icm_table *table, 80 u32 start, u32 end); 81int mlx4_init_icm_table(struct mlx4_dev *dev, struct mlx4_icm_table *table, 82 u64 virt, int obj_size, u64 nobj, int reserved, 83 int use_lowmem, int use_coherent); 84void mlx4_cleanup_icm_table(struct mlx4_dev *dev, struct mlx4_icm_table *table); 85void *mlx4_table_find(struct mlx4_icm_table *table, u32 obj, dma_addr_t *dma_handle); 86 87static inline void mlx4_icm_first(struct mlx4_icm *icm, 88 struct mlx4_icm_iter *iter) 89{ 90 iter->icm = icm; 91 iter->chunk = list_empty(&icm->chunk_list) ? 92 NULL : list_entry(icm->chunk_list.next, 93 struct mlx4_icm_chunk, list); 94 iter->page_idx = 0; 95} 96 97static inline int mlx4_icm_last(struct mlx4_icm_iter *iter) 98{ 99 return !iter->chunk; 100} 101 102static inline void mlx4_icm_next(struct mlx4_icm_iter *iter) 103{ 104 if (++iter->page_idx >= iter->chunk->nsg) { 105 if (iter->chunk->list.next == &iter->icm->chunk_list) { 106 iter->chunk = NULL; 107 return; 108 } 109 110 iter->chunk = list_entry(iter->chunk->list.next, 111 struct mlx4_icm_chunk, list); 112 iter->page_idx = 0; 113 } 114} 115 116static inline dma_addr_t mlx4_icm_addr(struct mlx4_icm_iter *iter) 117{ 118 return sg_dma_address(&iter->chunk->mem[iter->page_idx]); 119} 120 121static inline unsigned long mlx4_icm_size(struct mlx4_icm_iter *iter) 122{ 123 return sg_dma_len(&iter->chunk->mem[iter->page_idx]); 124} 125 126int mlx4_MAP_ICM_AUX(struct mlx4_dev *dev, struct mlx4_icm *icm); 127int mlx4_UNMAP_ICM_AUX(struct mlx4_dev *dev); 128 129#endif /* MLX4_ICM_H */ 130