FreeBSD/Linux Kernel Cross Reference
sys/dev/mlx4/mlx4_core/icm.h

     /*
      * Copyright (c) 2005, 2006, 2007, 2008, 2014 Mellanox Technologies. All rights reserved.
      * Copyright (c) 2006, 2007 Cisco Systems, Inc.  All rights reserved.
      *
      * This software is available to you under a choice of one of two
      * licenses.  You may choose to be licensed under the terms of the GNU
      * General Public License (GPL) Version 2, available from the file
      * COPYING in the main directory of this source tree, or the
      * OpenIB.org BSD license below:
     *
     *     Redistribution and use in source and binary forms, with or
     *     without modification, are permitted provided that the following
     *     conditions are met:
     *
     *      - Redistributions of source code must retain the above
     *        copyright notice, this list of conditions and the following
     *        disclaimer.
     *
     *      - Redistributions in binary form must reproduce the above
     *        copyright notice, this list of conditions and the following
     *        disclaimer in the documentation and/or other materials
     *        provided with the distribution.
     *
     * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
     * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
     * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
     * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
     * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
     * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
     * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
     * SOFTWARE.
     */
    
    #ifndef MLX4_ICM_H
    #define MLX4_ICM_H
    
    #include <linux/list.h>
    #include <linux/pci.h>
    #include <linux/mutex.h>
    #include <linux/scatterlist.h>
    
    #define MLX4_ICM_CHUNK_LEN                                              \
            ((256 - sizeof (struct list_head) - 2 * sizeof (int)) /         \
             (sizeof (struct scatterlist)))
    
    #define MLX4_ICM_PAGE_SHIFT     12
    #define MLX4_ICM_PAGE_SIZE      (1 << MLX4_ICM_PAGE_SHIFT)
    
    struct mlx4_icm_chunk {
            struct list_head        list;
            int                     npages;
            int                     nsg;
            struct scatterlist      mem[MLX4_ICM_CHUNK_LEN];
    };
    
    struct mlx4_icm {
            struct list_head        chunk_list;
            int                     refcount;
    };
    
    struct mlx4_icm_iter {
            struct mlx4_icm        *icm;
            struct mlx4_icm_chunk  *chunk;
            int                     page_idx;
    };
    
    struct mlx4_dev;
    
    struct mlx4_icm *mlx4_alloc_icm(struct mlx4_dev *dev, int npages,
                                    gfp_t gfp_mask, int coherent);
    void mlx4_free_icm(struct mlx4_dev *dev, struct mlx4_icm *icm, int coherent);
    
    int mlx4_table_get(struct mlx4_dev *dev, struct mlx4_icm_table *table, u32 obj,
                       gfp_t gfp);
    void mlx4_table_put(struct mlx4_dev *dev, struct mlx4_icm_table *table, u32 obj);
    int mlx4_table_get_range(struct mlx4_dev *dev, struct mlx4_icm_table *table,
                             u32 start, u32 end);
    void mlx4_table_put_range(struct mlx4_dev *dev, struct mlx4_icm_table *table,
                              u32 start, u32 end);
    int mlx4_init_icm_table(struct mlx4_dev *dev, struct mlx4_icm_table *table,
                            u64 virt, int obj_size, u32 nobj, int reserved,
                            int use_lowmem, int use_coherent);
    void mlx4_cleanup_icm_table(struct mlx4_dev *dev, struct mlx4_icm_table *table);
    void *mlx4_table_find(struct mlx4_icm_table *table, u32 obj, dma_addr_t *dma_handle);
    
    static inline void mlx4_icm_first(struct mlx4_icm *icm,
                                      struct mlx4_icm_iter *iter)
    {
            iter->icm      = icm;
            iter->chunk    = list_empty(&icm->chunk_list) ?
                    NULL : list_entry(icm->chunk_list.next,
                                      struct mlx4_icm_chunk, list);
            iter->page_idx = 0;
    }
    
    static inline int mlx4_icm_last(struct mlx4_icm_iter *iter)
    {
            return !iter->chunk;
    }
   
   static inline void mlx4_icm_next(struct mlx4_icm_iter *iter)
   {
           if (++iter->page_idx >= iter->chunk->nsg) {
                   if (iter->chunk->list.next == &iter->icm->chunk_list) {
                           iter->chunk = NULL;
                           return;
                   }
   
                   iter->chunk = list_entry(iter->chunk->list.next,
                                            struct mlx4_icm_chunk, list);
                   iter->page_idx = 0;
           }
   }
   
   static inline dma_addr_t mlx4_icm_addr(struct mlx4_icm_iter *iter)
   {
           return sg_dma_address(&iter->chunk->mem[iter->page_idx]);
   }
   
   static inline unsigned long mlx4_icm_size(struct mlx4_icm_iter *iter)
   {
           return sg_dma_len(&iter->chunk->mem[iter->page_idx]);
   }
   
   #endif /* MLX4_ICM_H */

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