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

INCLUDED FROM

DEFINITIONS

1. mlx4_icm_first
2. mlx4_icm_last
3. mlx4_icm_next
4. mlx4_icm_addr
5. mlx4_icm_size

   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_buf {
  51         void                    *addr;
  52         size_t                  size;
  53         dma_addr_t              dma_addr;
  54 };
  55 
  56 struct 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 
  67 struct mlx4_icm {
  68         struct list_head        chunk_list;
  69         int                     refcount;
  70 };
  71 
  72 struct mlx4_icm_iter {
  73         struct mlx4_icm        *icm;
  74         struct mlx4_icm_chunk  *chunk;
  75         int                     page_idx;
  76 };
  77 
  78 struct mlx4_dev;
  79 
  80 struct mlx4_icm *mlx4_alloc_icm(struct mlx4_dev *dev, int npages,
  81                                 gfp_t gfp_mask, int coherent);
  82 void mlx4_free_icm(struct mlx4_dev *dev, struct mlx4_icm *icm, int coherent);
  83 
  84 int mlx4_table_get(struct mlx4_dev *dev, struct mlx4_icm_table *table, u32 obj);
  85 void mlx4_table_put(struct mlx4_dev *dev, struct mlx4_icm_table *table, u32 obj);
  86 int mlx4_table_get_range(struct mlx4_dev *dev, struct mlx4_icm_table *table,
  87                          u32 start, u32 end);
  88 void mlx4_table_put_range(struct mlx4_dev *dev, struct mlx4_icm_table *table,
  89                           u32 start, u32 end);
  90 int 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);
  93 void mlx4_cleanup_icm_table(struct mlx4_dev *dev, struct mlx4_icm_table *table);
  94 void *mlx4_table_find(struct mlx4_icm_table *table, u32 obj, dma_addr_t *dma_handle);
  95 
  96 static 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 
 106 static inline int mlx4_icm_last(struct mlx4_icm_iter *iter)
 107 {
 108         return !iter->chunk;
 109 }
 110 
 111 static 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 
 125 static 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         else
 130                 return sg_dma_address(&iter->chunk->sg[iter->page_idx]);
 131 }
 132 
 133 static 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         else
 138                 return sg_dma_len(&iter->chunk->sg[iter->page_idx]);
 139 }
 140 
 141 int mlx4_MAP_ICM_AUX(struct mlx4_dev *dev, struct mlx4_icm *icm);
 142 int mlx4_UNMAP_ICM_AUX(struct mlx4_dev *dev);
 143 
 144 #endif /* MLX4_ICM_H */