linux/drivers/infiniband/hw/mthca/mthca_allocator.c

/*
 * Copyright (c) 2004 Topspin Communications.  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.
 */

#include <linux/errno.h>
#include <linux/slab.h>
#include <linux/bitmap.h>

#include "mthca_dev.h"

/* Trivial bitmap-based allocator */
u32 mthca_alloc(struct mthca_alloc *alloc)
{ … }

void mthca_free(struct mthca_alloc *alloc, u32 obj)
{ … }

int mthca_alloc_init(struct mthca_alloc *alloc, u32 num, u32 mask,
		     u32 reserved)
{ … }

void mthca_alloc_cleanup(struct mthca_alloc *alloc)
{ … }

/*
 * Array of pointers with lazy allocation of leaf pages.  Callers of
 * _get, _set and _clear methods must use a lock or otherwise
 * serialize access to the array.
 */

#define MTHCA_ARRAY_MASK …

void *mthca_array_get(struct mthca_array *array, int index)
{ … }

int mthca_array_set(struct mthca_array *array, int index, void *value)
{ … }

void mthca_array_clear(struct mthca_array *array, int index)
{ … }

int mthca_array_init(struct mthca_array *array, int nent)
{ … }

void mthca_array_cleanup(struct mthca_array *array, int nent)
{ … }

/*
 * Handling for queue buffers -- we allocate a bunch of memory and
 * register it in a memory region at HCA virtual address 0.  If the
 * requested size is > max_direct, we split the allocation into
 * multiple pages, so we don't require too much contiguous memory.
 */

int mthca_buf_alloc(struct mthca_dev *dev, int size, int max_direct,
		    union mthca_buf *buf, int *is_direct, struct mthca_pd *pd,
		    int hca_write, struct mthca_mr *mr)
{ … }

void mthca_buf_free(struct mthca_dev *dev, int size, union mthca_buf *buf,
		    int is_direct, struct mthca_mr *mr)
{ … }