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/*

 * Copyright (c) 2005 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>

#define MLX4_ICM_CHUNK_LEN                                              \

        ((256 - sizeof (struct list_head) - 2 * sizeof (int)) /         \

         (sizeof (struct scatterlist)))

enum {

        MLX4_ICM_PAGE_SHIFT     = 12,

        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, int obj);

void mlx4_table_put(struct mlx4_dev *dev, struct mlx4_icm_table *table, int obj);

int mlx4_table_get_range(struct mlx4_dev *dev, struct mlx4_icm_table *table,

                         int start, int end);

void mlx4_table_put_range(struct mlx4_dev *dev, struct mlx4_icm_table *table,

                          int start, int end);

int mlx4_init_icm_table(struct mlx4_dev *dev, struct mlx4_icm_table *table,

                        u64 virt, int obj_size, int nobj, int reserved,

                        int use_lowmem, int use_coherent);

void mlx4_cleanup_icm_table(struct mlx4_dev *dev, struct mlx4_icm_table *table);

int mlx4_table_get(struct mlx4_dev *dev, struct mlx4_icm_table *table, int obj);

void mlx4_table_put(struct mlx4_dev *dev, struct mlx4_icm_table *table, int obj);

void *mlx4_table_find(struct mlx4_icm_table *table, int obj, dma_addr_t *dma_handle);

int mlx4_table_get_range(struct mlx4_dev *dev, struct mlx4_icm_table *table,

                         int start, int end);

void mlx4_table_put_range(struct mlx4_dev *dev, struct mlx4_icm_table *table,

                          int start, int end);

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]);

}

int mlx4_UNMAP_ICM(struct mlx4_dev *dev, u64 virt, u32 page_count);

int mlx4_MAP_ICM_page(struct mlx4_dev *dev, u64 dma_addr, u64 virt);

int mlx4_MAP_ICM_AUX(struct mlx4_dev *dev, struct mlx4_icm *icm);

int mlx4_UNMAP_ICM_AUX(struct mlx4_dev *dev);

#endif /* MLX4_ICM_H */