release/src-rt-6.x.4708/linux/linux-2.6.36/drivers/infiniband/hw/mthca/mthca_memfree.h

   1 /*
   2  * Copyright (c) 2004, 2005 Topspin Communications.  All rights reserved.
   3  * Copyright (c) 2005 Cisco Systems.  All rights reserved.
   4  * Copyright (c) 2005 Mellanox Technologies. All rights reserved.
   5  *
   6  * This software is available to you under a choice of one of two
   7  * licenses.  You may choose to be licensed under the terms of the GNU
   8  * General Public License (GPL) Version 2, available from the file
   9  * COPYING in the main directory of this source tree, or the
  10  * OpenIB.org BSD license below:
  11  *
  12  *     Redistribution and use in source and binary forms, with or
  13  *     without modification, are permitted provided that the following
  14  *     conditions are met:
  15  *
  16  *      - Redistributions of source code must retain the above
  17  *        copyright notice, this list of conditions and the following
  18  *        disclaimer.
  19  *
  20  *      - Redistributions in binary form must reproduce the above
  21  *        copyright notice, this list of conditions and the following
  22  *        disclaimer in the documentation and/or other materials
  23  *        provided with the distribution.
  24  *
  25  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  26  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  27  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  28  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
  29  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
  30  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  31  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  32  * SOFTWARE.
  33  */
  34
  35 #ifndef MTHCA_MEMFREE_H
  36 #define MTHCA_MEMFREE_H
  37
  38 #include <linux/list.h>
  39 #include <linux/mutex.h>
  40
  41 #define MTHCA_ICM_CHUNK_LEN \
  42         ((256 - sizeof (struct list_head) - 2 * sizeof (int)) /         \
  43          (sizeof (struct scatterlist)))
  44
  45 enum {
  46         MTHCA_ICM_PAGE_SHIFT    = 12,
  47         MTHCA_ICM_PAGE_SIZE     = 1 << MTHCA_ICM_PAGE_SHIFT,
  48         MTHCA_DB_REC_PER_PAGE   = MTHCA_ICM_PAGE_SIZE / 8
  49 };
  50
  51 struct mthca_icm_chunk {
  52         struct list_head   list;
  53         int                npages;
  54         int                nsg;
  55         struct scatterlist mem[MTHCA_ICM_CHUNK_LEN];
  56 };
  57
  58 struct mthca_icm {
  59         struct list_head chunk_list;
  60         int              refcount;
  61 };
  62
  63 struct mthca_icm_table {
  64         u64               virt;
  65         int               num_icm;
  66         int               num_obj;
  67         int               obj_size;
  68         int               lowmem;
  69         int               coherent;
  70         struct mutex      mutex;
  71         struct mthca_icm *icm[0];
  72 };
  73
  74 struct mthca_icm_iter {
  75         struct mthca_icm       *icm;
  76         struct mthca_icm_chunk *chunk;
  77         int                     page_idx;
  78 };
  79
  80 struct mthca_dev;
  81
  82 struct mthca_icm *mthca_alloc_icm(struct mthca_dev *dev, int npages,
  83                                   gfp_t gfp_mask, int coherent);
  84 void mthca_free_icm(struct mthca_dev *dev, struct mthca_icm *icm, int coherent);
  85
  86 struct mthca_icm_table *mthca_alloc_icm_table(struct mthca_dev *dev,
  87                                               u64 virt, int obj_size,
  88                                               int nobj, int reserved,
  89                                               int use_lowmem, int use_coherent);
  90 void mthca_free_icm_table(struct mthca_dev *dev, struct mthca_icm_table *table);
  91 int mthca_table_get(struct mthca_dev *dev, struct mthca_icm_table *table, int obj);
  92 void mthca_table_put(struct mthca_dev *dev, struct mthca_icm_table *table, int obj);
  93 void *mthca_table_find(struct mthca_icm_table *table, int obj, dma_addr_t *dma_handle);
  94 int mthca_table_get_range(struct mthca_dev *dev, struct mthca_icm_table *table,
  95                           int start, int end);
  96 void mthca_table_put_range(struct mthca_dev *dev, struct mthca_icm_table *table,
  97                            int start, int end);
  98
  99 static inline void mthca_icm_first(struct mthca_icm *icm,
 100                                    struct mthca_icm_iter *iter)
 101 {
 102         iter->icm      = icm;
 103         iter->chunk    = list_empty(&icm->chunk_list) ?
 104                 NULL : list_entry(icm->chunk_list.next,
 105                                   struct mthca_icm_chunk, list);
 106         iter->page_idx = 0;
 107 }
 108
 109 static inline int mthca_icm_last(struct mthca_icm_iter *iter)
 110 {
 111         return !iter->chunk;
 112 }
 113
 114 static inline void mthca_icm_next(struct mthca_icm_iter *iter)
 115 {
 116         if (++iter->page_idx >= iter->chunk->nsg) {
 117                 if (iter->chunk->list.next == &iter->icm->chunk_list) {
 118                         iter->chunk = NULL;
 119                         return;
 120                 }
 121
 122                 iter->chunk = list_entry(iter->chunk->list.next,
 123                                          struct mthca_icm_chunk, list);
 124                 iter->page_idx = 0;
 125         }
 126 }
 127
 128 static inline dma_addr_t mthca_icm_addr(struct mthca_icm_iter *iter)
 129 {
 130         return sg_dma_address(&iter->chunk->mem[iter->page_idx]);
 131 }
 132
 133 static inline unsigned long mthca_icm_size(struct mthca_icm_iter *iter)
 134 {
 135         return sg_dma_len(&iter->chunk->mem[iter->page_idx]);
 136 }
 137
 138 struct mthca_db_page {
 139         DECLARE_BITMAP(used, MTHCA_DB_REC_PER_PAGE);
 140         __be64    *db_rec;
 141         dma_addr_t mapping;
 142 };
 143
 144 struct mthca_db_table {
 145         int                   npages;
 146         int                   max_group1;
 147         int                   min_group2;
 148         struct mthca_db_page *page;
 149         struct mutex          mutex;
 150 };
 151
 152 enum mthca_db_type {
 153         MTHCA_DB_TYPE_INVALID   = 0x0,
 154         MTHCA_DB_TYPE_CQ_SET_CI = 0x1,
 155         MTHCA_DB_TYPE_CQ_ARM    = 0x2,
 156         MTHCA_DB_TYPE_SQ        = 0x3,
 157         MTHCA_DB_TYPE_RQ        = 0x4,
 158         MTHCA_DB_TYPE_SRQ       = 0x5,
 159         MTHCA_DB_TYPE_GROUP_SEP = 0x7
 160 };
 161
 162 struct mthca_user_db_table;
 163 struct mthca_uar;
 164
 165 int mthca_map_user_db(struct mthca_dev *dev, struct mthca_uar *uar,
 166                       struct mthca_user_db_table *db_tab, int index, u64 uaddr);
 167 void mthca_unmap_user_db(struct mthca_dev *dev, struct mthca_uar *uar,
 168                          struct mthca_user_db_table *db_tab, int index);
 169 struct mthca_user_db_table *mthca_init_user_db_tab(struct mthca_dev *dev);
 170 void mthca_cleanup_user_db_tab(struct mthca_dev *dev, struct mthca_uar *uar,
 171                                struct mthca_user_db_table *db_tab);
 172
 173 int mthca_init_db_tab(struct mthca_dev *dev);
 174 void mthca_cleanup_db_tab(struct mthca_dev *dev);
 175 int mthca_alloc_db(struct mthca_dev *dev, enum mthca_db_type type,
 176                    u32 qn, __be32 **db);
 177 void mthca_free_db(struct mthca_dev *dev, int type, int db_index);
 178
 179 #endif /* MTHCA_MEMFREE_H */