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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 two6 * licenses. You may choose to be licensed under the terms of the GNU7 * General Public License (GPL) Version 2, available from the file8 * COPYING in the main directory of this source tree, or the9 * OpenIB.org BSD license below:10 *11 * Redistribution and use in source and binary forms, with or12 * without modification, are permitted provided that the following13 * conditions are met:14 *15 * - Redistributions of source code must retain the above16 * copyright notice, this list of conditions and the following17 * disclaimer.18 *19 * - Redistributions in binary form must reproduce the above20 * copyright notice, this list of conditions and the following21 * disclaimer in the documentation and/or other materials22 * 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 OF26 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND27 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS28 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN29 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN30 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE31 * SOFTWARE.32 */33 34#ifndef MLX4_ICM_H35#define MLX4_ICM_H36 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_buf {51 void *addr;52 size_t size;53 dma_addr_t dma_addr;54};55 56struct 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 67struct mlx4_icm {68 struct list_head chunk_list;69 int refcount;70};71 72struct mlx4_icm_iter {73 struct mlx4_icm *icm;74 struct mlx4_icm_chunk *chunk;75 int page_idx;76};77 78struct mlx4_dev;79 80struct mlx4_icm *mlx4_alloc_icm(struct mlx4_dev *dev, int npages,81 gfp_t gfp_mask, int coherent);82void mlx4_free_icm(struct mlx4_dev *dev, struct mlx4_icm *icm, int coherent);83 84int mlx4_table_get(struct mlx4_dev *dev, struct mlx4_icm_table *table, u32 obj);85void mlx4_table_put(struct mlx4_dev *dev, struct mlx4_icm_table *table, u32 obj);86int mlx4_table_get_range(struct mlx4_dev *dev, struct mlx4_icm_table *table,87 u32 start, u32 end);88void mlx4_table_put_range(struct mlx4_dev *dev, struct mlx4_icm_table *table,89 u32 start, u32 end);90int 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);93void mlx4_cleanup_icm_table(struct mlx4_dev *dev, struct mlx4_icm_table *table);94void *mlx4_table_find(struct mlx4_icm_table *table, u32 obj, dma_addr_t *dma_handle);95 96static 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 106static inline int mlx4_icm_last(struct mlx4_icm_iter *iter)107{108 return !iter->chunk;109}110 111static 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 125static 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 else130 return sg_dma_address(&iter->chunk->sg[iter->page_idx]);131}132 133static 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 else138 return sg_dma_len(&iter->chunk->sg[iter->page_idx]);139}140 141int mlx4_MAP_ICM_AUX(struct mlx4_dev *dev, struct mlx4_icm *icm);142int mlx4_UNMAP_ICM_AUX(struct mlx4_dev *dev);143 144#endif /* MLX4_ICM_H */145