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
  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
  45enum {
  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
  51struct mthca_icm_chunk {
  52        struct list_head   list;
  53        int                npages;
  54        int                nsg;
  55        struct scatterlist mem[MTHCA_ICM_CHUNK_LEN];
  56};
  57
  58struct mthca_icm {
  59        struct list_head chunk_list;
  60        int              refcount;
  61};
  62
  63struct 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
  74struct mthca_icm_iter {
  75        struct mthca_icm       *icm;
  76        struct mthca_icm_chunk *chunk;
  77        int                     page_idx;
  78};
  79
  80struct mthca_dev;
  81
  82struct mthca_icm *mthca_alloc_icm(struct mthca_dev *dev, int npages,
  83                                  gfp_t gfp_mask, int coherent);
  84void mthca_free_icm(struct mthca_dev *dev, struct mthca_icm *icm, int coherent);
  85
  86struct 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);
  90void mthca_free_icm_table(struct mthca_dev *dev, struct mthca_icm_table *table);
  91int mthca_table_get(struct mthca_dev *dev, struct mthca_icm_table *table, int obj);
  92void mthca_table_put(struct mthca_dev *dev, struct mthca_icm_table *table, int obj);
  93void *mthca_table_find(struct mthca_icm_table *table, int obj, dma_addr_t *dma_handle);
  94int mthca_table_get_range(struct mthca_dev *dev, struct mthca_icm_table *table,
  95                          int start, int end);
  96void mthca_table_put_range(struct mthca_dev *dev, struct mthca_icm_table *table,
  97                           int start, int end);
  98
  99static 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
 109static inline int mthca_icm_last(struct mthca_icm_iter *iter)
 110{
 111        return !iter->chunk;
 112}
 113
 114static 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
 128static 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
 133static 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
 138struct mthca_db_page {
 139        DECLARE_BITMAP(used, MTHCA_DB_REC_PER_PAGE);
 140        __be64    *db_rec;
 141        dma_addr_t mapping;
 142};
 143
 144struct 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
 152enum 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
 162struct mthca_user_db_table;
 163struct mthca_uar;
 164
 165int mthca_map_user_db(struct mthca_dev *dev, struct mthca_uar *uar,
 166                      struct mthca_user_db_table *db_tab, int index, u64 uaddr);
 167void mthca_unmap_user_db(struct mthca_dev *dev, struct mthca_uar *uar,
 168                         struct mthca_user_db_table *db_tab, int index);
 169struct mthca_user_db_table *mthca_init_user_db_tab(struct mthca_dev *dev);
 170void mthca_cleanup_user_db_tab(struct mthca_dev *dev, struct mthca_uar *uar,
 171                               struct mthca_user_db_table *db_tab);
 172
 173int mthca_init_db_tab(struct mthca_dev *dev);
 174void mthca_cleanup_db_tab(struct mthca_dev *dev);
 175int mthca_alloc_db(struct mthca_dev *dev, enum mthca_db_type type,
 176                   u32 qn, __be32 **db);
 177void mthca_free_db(struct mthca_dev *dev, int type, int db_index);
 178
 179#endif /* MTHCA_MEMFREE_H */
 180