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  * $Id$
  35  */
  36
  37 #ifndef MTHCA_MEMFREE_H
  38 #define MTHCA_MEMFREE_H
  39
  40 #include <linux/list.h>
  41 #include <linux/pci.h>
  42
  43 #include <asm/semaphore.h>
  44
  45 #define MTHCA_ICM_CHUNK_LEN \
  46         ((256 - sizeof (struct list_head) - 2 * sizeof (int)) /         \
  47          (sizeof (struct scatterlist)))
  48
  49 struct mthca_icm_chunk {
  50         struct list_head   list;
  51         int                npages;
  52         int                nsg;
  53         struct scatterlist mem[MTHCA_ICM_CHUNK_LEN];
  54 };
  55
  56 struct mthca_icm {
  57         struct list_head chunk_list;
  58         int              refcount;
  59 };
  60
  61 struct mthca_icm_table {
  62         u64               virt;
  63         int               num_icm;
  64         int               num_obj;
  65         int               obj_size;
  66         int               lowmem;
  67         struct semaphore  mutex;
  68         struct mthca_icm *icm[0];
  69 };
  70
  71 struct mthca_icm_iter {
  72         struct mthca_icm       *icm;
  73         struct mthca_icm_chunk *chunk;
  74         int                     page_idx;
  75 };
  76
  77 struct mthca_dev;
  78
  79 struct mthca_icm *mthca_alloc_icm(struct mthca_dev *dev, int npages,
  80                                   gfp_t gfp_mask);
  81 void mthca_free_icm(struct mthca_dev *dev, struct mthca_icm *icm);
  82
  83 struct mthca_icm_table *mthca_alloc_icm_table(struct mthca_dev *dev,
  84                                               u64 virt, int obj_size,
  85                                               int nobj, int reserved,
  86                                               int use_lowmem);
  87 void mthca_free_icm_table(struct mthca_dev *dev, struct mthca_icm_table *table);
  88 int mthca_table_get(struct mthca_dev *dev, struct mthca_icm_table *table, int obj);
  89 void mthca_table_put(struct mthca_dev *dev, struct mthca_icm_table *table, int obj);
  90 void *mthca_table_find(struct mthca_icm_table *table, int obj);
  91 int mthca_table_get_range(struct mthca_dev *dev, struct mthca_icm_table *table,
  92                           int start, int end);
  93 void mthca_table_put_range(struct mthca_dev *dev, struct mthca_icm_table *table,
  94                            int start, int end);
  95
  96 static inline void mthca_icm_first(struct mthca_icm *icm,
  97                                    struct mthca_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 mthca_icm_chunk, list);
 103         iter->page_idx = 0;
 104 }
 105
 106 static inline int mthca_icm_last(struct mthca_icm_iter *iter)
 107 {
 108         return !iter->chunk;
 109 }
 110
 111 static inline void mthca_icm_next(struct mthca_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 mthca_icm_chunk, list);
 121                 iter->page_idx = 0;
 122         }
 123 }
 124
 125 static inline dma_addr_t mthca_icm_addr(struct mthca_icm_iter *iter)
 126 {
 127         return sg_dma_address(&iter->chunk->mem[iter->page_idx]);
 128 }
 129
 130 static inline unsigned long mthca_icm_size(struct mthca_icm_iter *iter)
 131 {
 132         return sg_dma_len(&iter->chunk->mem[iter->page_idx]);
 133 }
 134
 135 enum {
 136         MTHCA_DB_REC_PER_PAGE = 4096 / 8
 137 };
 138
 139 struct mthca_db_page {
 140         DECLARE_BITMAP(used, MTHCA_DB_REC_PER_PAGE);
 141         __be64    *db_rec;
 142         dma_addr_t mapping;
 143 };
 144
 145 struct mthca_db_table {
 146         int                   npages;
 147         int                   max_group1;
 148         int                   min_group2;
 149         struct mthca_db_page *page;
 150         struct semaphore      mutex;
 151 };
 152
 153 enum mthca_db_type {
 154         MTHCA_DB_TYPE_INVALID   = 0x0,
 155         MTHCA_DB_TYPE_CQ_SET_CI = 0x1,
 156         MTHCA_DB_TYPE_CQ_ARM    = 0x2,
 157         MTHCA_DB_TYPE_SQ        = 0x3,
 158         MTHCA_DB_TYPE_RQ        = 0x4,
 159         MTHCA_DB_TYPE_SRQ       = 0x5,
 160         MTHCA_DB_TYPE_GROUP_SEP = 0x7
 161 };
 162
 163 struct mthca_user_db_table;
 164 struct mthca_uar;
 165
 166 int mthca_map_user_db(struct mthca_dev *dev, struct mthca_uar *uar,
 167                       struct mthca_user_db_table *db_tab, int index, u64 uaddr);
 168 void mthca_unmap_user_db(struct mthca_dev *dev, struct mthca_uar *uar,
 169                          struct mthca_user_db_table *db_tab, int index);
 170 struct mthca_user_db_table *mthca_init_user_db_tab(struct mthca_dev *dev);
 171 void mthca_cleanup_user_db_tab(struct mthca_dev *dev, struct mthca_uar *uar,
 172                                struct mthca_user_db_table *db_tab);
 173
 174 int mthca_init_db_tab(struct mthca_dev *dev);
 175 void mthca_cleanup_db_tab(struct mthca_dev *dev);
 176 int mthca_alloc_db(struct mthca_dev *dev, enum mthca_db_type type,
 177                    u32 qn, __be32 **db);
 178 void mthca_free_db(struct mthca_dev *dev, int type, int db_index);
 179
 180 #endif /* MTHCA_MEMFREE_H */