icm.h
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/*
* Copyright (c) 2005, 2006, 2007, 2008 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, 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]);
}
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 */