LXR linux/drivers/infiniband/hw/mthca/mthca

   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#include <linux/mutex.h>
  43
  44#define MTHCA_ICM_CHUNK_LEN \
  45        ((256 - sizeof (struct list_head) - 2 * sizeof (int)) /         \
  46         (sizeof (struct scatterlist)))
  47
  48enum {
  49        MTHCA_ICM_PAGE_SHIFT    = 12,
  50        MTHCA_ICM_PAGE_SIZE     = 1 << MTHCA_ICM_PAGE_SHIFT,
  51        MTHCA_DB_REC_PER_PAGE   = MTHCA_ICM_PAGE_SIZE / 8
  52};
  53
  54struct mthca_icm_chunk {
  55        struct list_head   list;
  56        int                npages;
  57        int                nsg;
  58        struct scatterlist mem[MTHCA_ICM_CHUNK_LEN];
  59};
  60
  61struct mthca_icm {
  62        struct list_head chunk_list;
  63        int              refcount;
  64};
  65
  66struct mthca_icm_table {
  67        u64               virt;
  68        int               num_icm;
  69        int               num_obj;
  70        int               obj_size;
  71        int               lowmem;
  72        struct mutex      mutex;
  73        struct mthca_icm *icm[0];
  74};
  75
  76struct mthca_icm_iter {
  77        struct mthca_icm       *icm;
  78        struct mthca_icm_chunk *chunk;
  79        int                     page_idx;
  80};
  81
  82struct mthca_dev;
  83
  84struct mthca_icm *mthca_alloc_icm(struct mthca_dev *dev, int npages,
  85                                  gfp_t gfp_mask);
  86void mthca_free_icm(struct mthca_dev *dev, struct mthca_icm *icm);
  87
  88struct mthca_icm_table *mthca_alloc_icm_table(struct mthca_dev *dev,
  89                                              u64 virt, int obj_size,
  90                                              int nobj, int reserved,
  91                                              int use_lowmem);
  92void mthca_free_icm_table(struct mthca_dev *dev, struct mthca_icm_table *table);
  93int mthca_table_get(struct mthca_dev *dev, struct mthca_icm_table *table, int obj);
  94void mthca_table_put(struct mthca_dev *dev, struct mthca_icm_table *table, int obj);
  95void *mthca_table_find(struct mthca_icm_table *table, int obj);
  96int mthca_table_get_range(struct mthca_dev *dev, struct mthca_icm_table *table,
  97                          int start, int end);
  98void mthca_table_put_range(struct mthca_dev *dev, struct mthca_icm_table *table,
  99                           int start, int end);
 100
 101static inline void mthca_icm_first(struct mthca_icm *icm,
 102                                   struct mthca_icm_iter *iter)
 103{
 104        iter->icm      = icm;
 105        iter->chunk    = list_empty(&icm->chunk_list) ?
 106                NULL : list_entry(icm->chunk_list.next,
 107                                  struct mthca_icm_chunk, list);
 108        iter->page_idx = 0;
 109}
 110
 111static inline int mthca_icm_last(struct mthca_icm_iter *iter)
 112{
 113        return !iter->chunk;
 114}
 115
 116static inline void mthca_icm_next(struct mthca_icm_iter *iter)
 117{
 118        if (++iter->page_idx >= iter->chunk->nsg) {
 119                if (iter->chunk->list.next == &iter->icm->chunk_list) {
 120                        iter->chunk = NULL;
 121                        return;
 122                }
 123
 124                iter->chunk = list_entry(iter->chunk->list.next,
 125                                         struct mthca_icm_chunk, list);
 126                iter->page_idx = 0;
 127        }
 128}
 129
 130static inline dma_addr_t mthca_icm_addr(struct mthca_icm_iter *iter)
 131{
 132        return sg_dma_address(&iter->chunk->mem[iter->page_idx]);
 133}
 134
 135static inline unsigned long mthca_icm_size(struct mthca_icm_iter *iter)
 136{
 137        return sg_dma_len(&iter->chunk->mem[iter->page_idx]);
 138}
 139
 140struct mthca_db_page {
 141        DECLARE_BITMAP(used, MTHCA_DB_REC_PER_PAGE);
 142        __be64    *db_rec;
 143        dma_addr_t mapping;
 144};
 145
 146struct mthca_db_table {
 147        int                   npages;
 148        int                   max_group1;
 149        int                   min_group2;
 150        struct mthca_db_page *page;
 151        struct mutex          mutex;
 152};
 153
 154enum mthca_db_type {
 155        MTHCA_DB_TYPE_INVALID   = 0x0,
 156        MTHCA_DB_TYPE_CQ_SET_CI = 0x1,
 157        MTHCA_DB_TYPE_CQ_ARM    = 0x2,
 158        MTHCA_DB_TYPE_SQ        = 0x3,
 159        MTHCA_DB_TYPE_RQ        = 0x4,
 160        MTHCA_DB_TYPE_SRQ       = 0x5,
 161        MTHCA_DB_TYPE_GROUP_SEP = 0x7
 162};
 163
 164struct mthca_user_db_table;
 165struct mthca_uar;
 166
 167int mthca_map_user_db(struct mthca_dev *dev, struct mthca_uar *uar,
 168                      struct mthca_user_db_table *db_tab, int index, u64 uaddr);
 169void mthca_unmap_user_db(struct mthca_dev *dev, struct mthca_uar *uar,
 170                         struct mthca_user_db_table *db_tab, int index);
 171struct mthca_user_db_table *mthca_init_user_db_tab(struct mthca_dev *dev);
 172void mthca_cleanup_user_db_tab(struct mthca_dev *dev, struct mthca_uar *uar,
 173                               struct mthca_user_db_table *db_tab);
 174
 175int mthca_init_db_tab(struct mthca_dev *dev);
 176void mthca_cleanup_db_tab(struct mthca_dev *dev);
 177int mthca_alloc_db(struct mthca_dev *dev, enum mthca_db_type type,
 178                   u32 qn, __be32 **db);
 179void mthca_free_db(struct mthca_dev *dev, int type, int db_index);
 180
 181#endif /* MTHCA_MEMFREE_H */
 182