drivers/net/ethernet/mellanox/mlx4/icm.h

   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
  45 enum {
  46         MLX4_ICM_PAGE_SHIFT     = 12,
  47         MLX4_ICM_PAGE_SIZE      = 1 << MLX4_ICM_PAGE_SHIFT,
  48 };
  49
  50 struct mlx4_icm_chunk {
  51         struct list_head        list;
  52         int                     npages;
  53         int                     nsg;
  54         struct scatterlist      mem[MLX4_ICM_CHUNK_LEN];
  55 };
  56
  57 struct mlx4_icm {
  58         struct list_head        chunk_list;
  59         int                     refcount;
  60 };
  61
  62 struct mlx4_icm_iter {
  63         struct mlx4_icm        *icm;
  64         struct mlx4_icm_chunk  *chunk;
  65         int                     page_idx;
  66 };
  67
  68 struct mlx4_dev;
  69
  70 struct mlx4_icm *mlx4_alloc_icm(struct mlx4_dev *dev, int npages,
  71                                 gfp_t gfp_mask, int coherent);
  72 void mlx4_free_icm(struct mlx4_dev *dev, struct mlx4_icm *icm, int coherent);
  73
  74 int mlx4_table_get(struct mlx4_dev *dev, struct mlx4_icm_table *table, u32 obj,
  75                    gfp_t gfp);
  76 void mlx4_table_put(struct mlx4_dev *dev, struct mlx4_icm_table *table, u32 obj);
  77 int mlx4_table_get_range(struct mlx4_dev *dev, struct mlx4_icm_table *table,
  78                          u32 start, u32 end);
  79 void mlx4_table_put_range(struct mlx4_dev *dev, struct mlx4_icm_table *table,
  80                           u32 start, u32 end);
  81 int mlx4_init_icm_table(struct mlx4_dev *dev, struct mlx4_icm_table *table,
  82                         u64 virt, int obj_size, u32 nobj, int reserved,
  83                         int use_lowmem, int use_coherent);
  84 void mlx4_cleanup_icm_table(struct mlx4_dev *dev, struct mlx4_icm_table *table);
  85 void *mlx4_table_find(struct mlx4_icm_table *table, u32 obj, dma_addr_t *dma_handle);
  86
  87 static 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
  97 static inline int mlx4_icm_last(struct mlx4_icm_iter *iter)
  98 {
  99         return !iter->chunk;
 100 }
 101
 102 static 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
 116 static 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
 121 static 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
 126 int mlx4_MAP_ICM_AUX(struct mlx4_dev *dev, struct mlx4_icm *icm);
 127 int mlx4_UNMAP_ICM_AUX(struct mlx4_dev *dev);
 128
 129 #endif /* MLX4_ICM_H */