drivers/infiniband/hw/mthca/mthca_memfree.h

   1 /*
   2  * Copyright (c) 2004, 2005 Topspin Communications.  All rights reserved.
   3  *
   4  * This software is available to you under a choice of one of two
   5  * licenses.  You may choose to be licensed under the terms of the GNU
   6  * General Public License (GPL) Version 2, available from the file
   7  * COPYING in the main directory of this source tree, or the
   8  * OpenIB.org BSD license below:
   9  *
  10  *     Redistribution and use in source and binary forms, with or
  11  *     without modification, are permitted provided that the following
  12  *     conditions are met:
  13  *
  14  *      - Redistributions of source code must retain the above
  15  *        copyright notice, this list of conditions and the following
  16  *        disclaimer.
  17  *
  18  *      - Redistributions in binary form must reproduce the above
  19  *        copyright notice, this list of conditions and the following
  20  *        disclaimer in the documentation and/or other materials
  21  *        provided with the distribution.
  22  *
  23  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  24  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  25  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  26  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
  27  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
  28  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  29  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  30  * SOFTWARE.
  31  *
  32  * $Id$
  33  */
  34
  35 #ifndef MTHCA_MEMFREE_H
  36 #define MTHCA_MEMFREE_H
  37
  38 #include <linux/list.h>
  39 #include <linux/pci.h>
  40
  41 #include <asm/semaphore.h>
  42
  43 #define MTHCA_ICM_CHUNK_LEN \
  44         ((256 - sizeof (struct list_head) - 2 * sizeof (int)) /         \
  45          (sizeof (struct scatterlist)))
  46
  47 struct mthca_icm_chunk {
  48         struct list_head   list;
  49         int                npages;
  50         int                nsg;
  51         struct scatterlist mem[MTHCA_ICM_CHUNK_LEN];
  52 };
  53
  54 struct mthca_icm {
  55         struct list_head chunk_list;
  56         int              refcount;
  57 };
  58
  59 struct mthca_icm_table {
  60         u64               virt;
  61         int               num_icm;
  62         int               num_obj;
  63         int               obj_size;
  64         int               lowmem;
  65         struct semaphore  mutex;
  66         struct mthca_icm *icm[0];
  67 };
  68
  69 struct mthca_icm_iter {
  70         struct mthca_icm       *icm;
  71         struct mthca_icm_chunk *chunk;
  72         int                     page_idx;
  73 };
  74
  75 struct mthca_dev;
  76
  77 struct mthca_icm *mthca_alloc_icm(struct mthca_dev *dev, int npages,
  78                                   unsigned int gfp_mask);
  79 void mthca_free_icm(struct mthca_dev *dev, struct mthca_icm *icm);
  80
  81 struct mthca_icm_table *mthca_alloc_icm_table(struct mthca_dev *dev,
  82                                               u64 virt, int obj_size,
  83                                               int nobj, int reserved,
  84                                               int use_lowmem);
  85 void mthca_free_icm_table(struct mthca_dev *dev, struct mthca_icm_table *table);
  86 int mthca_table_get(struct mthca_dev *dev, struct mthca_icm_table *table, int obj);
  87 void mthca_table_put(struct mthca_dev *dev, struct mthca_icm_table *table, int obj);
  88
  89 static inline void mthca_icm_first(struct mthca_icm *icm,
  90                                    struct mthca_icm_iter *iter)
  91 {
  92         iter->icm      = icm;
  93         iter->chunk    = list_empty(&icm->chunk_list) ?
  94                 NULL : list_entry(icm->chunk_list.next,
  95                                   struct mthca_icm_chunk, list);
  96         iter->page_idx = 0;
  97 }
  98
  99 static inline int mthca_icm_last(struct mthca_icm_iter *iter)
 100 {
 101         return !iter->chunk;
 102 }
 103
 104 static inline void mthca_icm_next(struct mthca_icm_iter *iter)
 105 {
 106         if (++iter->page_idx >= iter->chunk->nsg) {
 107                 if (iter->chunk->list.next == &iter->icm->chunk_list) {
 108                         iter->chunk = NULL;
 109                         return;
 110                 }
 111
 112                 iter->chunk = list_entry(iter->chunk->list.next,
 113                                          struct mthca_icm_chunk, list);
 114                 iter->page_idx = 0;
 115         }
 116 }
 117
 118 static inline dma_addr_t mthca_icm_addr(struct mthca_icm_iter *iter)
 119 {
 120         return sg_dma_address(&iter->chunk->mem[iter->page_idx]);
 121 }
 122
 123 static inline unsigned long mthca_icm_size(struct mthca_icm_iter *iter)
 124 {
 125         return sg_dma_len(&iter->chunk->mem[iter->page_idx]);
 126 }
 127
 128 enum {
 129         MTHCA_DB_REC_PER_PAGE = 4096 / 8
 130 };
 131
 132 struct mthca_db_page {
 133         DECLARE_BITMAP(used, MTHCA_DB_REC_PER_PAGE);
 134         u64       *db_rec;
 135         dma_addr_t mapping;
 136 };
 137
 138 struct mthca_db_table {
 139         int                   npages;
 140         int                   max_group1;
 141         int                   min_group2;
 142         struct mthca_db_page *page;
 143         struct semaphore      mutex;
 144 };
 145
 146 enum {
 147         MTHCA_DB_TYPE_INVALID   = 0x0,
 148         MTHCA_DB_TYPE_CQ_SET_CI = 0x1,
 149         MTHCA_DB_TYPE_CQ_ARM    = 0x2,
 150         MTHCA_DB_TYPE_SQ        = 0x3,
 151         MTHCA_DB_TYPE_RQ        = 0x4,
 152         MTHCA_DB_TYPE_SRQ       = 0x5,
 153         MTHCA_DB_TYPE_GROUP_SEP = 0x7
 154 };
 155
 156 int mthca_init_db_tab(struct mthca_dev *dev);
 157 void mthca_cleanup_db_tab(struct mthca_dev *dev);
 158 int mthca_alloc_db(struct mthca_dev *dev, int type, u32 qn, u32 **db);
 159 void mthca_free_db(struct mthca_dev *dev, int type, int db_index);
 160
 161 #endif /* MTHCA_MEMFREE_H */