2007-05-08 19:00:38 -06:00
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/*
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* Copyright (c) 2006, 2007 Cisco Systems, Inc. All rights reserved.
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*
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* This software is available to you under a choice of one of two
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* licenses. You may choose to be licensed under the terms of the GNU
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* General Public License (GPL) Version 2, available from the file
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* COPYING in the main directory of this source tree, or the
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* OpenIB.org BSD license below:
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*
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* Redistribution and use in source and binary forms, with or
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* without modification, are permitted provided that the following
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* conditions are met:
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*
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* - Redistributions of source code must retain the above
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* copyright notice, this list of conditions and the following
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* disclaimer.
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*
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* - Redistributions in binary form must reproduce the above
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* copyright notice, this list of conditions and the following
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* disclaimer in the documentation and/or other materials
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* provided with the distribution.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
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* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
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* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*/
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#include <linux/errno.h>
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#include <linux/slab.h>
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#include <linux/bitmap.h>
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2007-05-15 13:36:30 -06:00
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#include <linux/dma-mapping.h>
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2007-05-08 19:00:38 -06:00
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#include "mlx4.h"
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u32 mlx4_bitmap_alloc(struct mlx4_bitmap *bitmap)
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{
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u32 obj;
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spin_lock(&bitmap->lock);
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obj = find_next_zero_bit(bitmap->table, bitmap->max, bitmap->last);
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if (obj >= bitmap->max) {
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bitmap->top = (bitmap->top + bitmap->max) & bitmap->mask;
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obj = find_first_zero_bit(bitmap->table, bitmap->max);
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}
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if (obj < bitmap->max) {
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set_bit(obj, bitmap->table);
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2007-05-29 17:07:09 -06:00
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bitmap->last = (obj + 1) & (bitmap->max - 1);
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2007-05-08 19:00:38 -06:00
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obj |= bitmap->top;
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} else
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obj = -1;
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spin_unlock(&bitmap->lock);
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return obj;
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}
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void mlx4_bitmap_free(struct mlx4_bitmap *bitmap, u32 obj)
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{
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obj &= bitmap->max - 1;
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spin_lock(&bitmap->lock);
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clear_bit(obj, bitmap->table);
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bitmap->last = min(bitmap->last, obj);
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bitmap->top = (bitmap->top + bitmap->max) & bitmap->mask;
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spin_unlock(&bitmap->lock);
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}
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int mlx4_bitmap_init(struct mlx4_bitmap *bitmap, u32 num, u32 mask, u32 reserved)
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{
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int i;
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/* num must be a power of 2 */
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if (num != roundup_pow_of_two(num))
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return -EINVAL;
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bitmap->last = 0;
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bitmap->top = 0;
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bitmap->max = num;
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bitmap->mask = mask;
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spin_lock_init(&bitmap->lock);
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bitmap->table = kzalloc(BITS_TO_LONGS(num) * sizeof (long), GFP_KERNEL);
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if (!bitmap->table)
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return -ENOMEM;
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for (i = 0; i < reserved; ++i)
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set_bit(i, bitmap->table);
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return 0;
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}
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void mlx4_bitmap_cleanup(struct mlx4_bitmap *bitmap)
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{
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kfree(bitmap->table);
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}
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/*
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* Handling for queue buffers -- we allocate a bunch of memory and
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* register it in a memory region at HCA virtual address 0. If the
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* requested size is > max_direct, we split the allocation into
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* multiple pages, so we don't require too much contiguous memory.
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*/
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int mlx4_buf_alloc(struct mlx4_dev *dev, int size, int max_direct,
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struct mlx4_buf *buf)
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{
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dma_addr_t t;
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if (size <= max_direct) {
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buf->nbufs = 1;
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buf->npages = 1;
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buf->page_shift = get_order(size) + PAGE_SHIFT;
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buf->u.direct.buf = dma_alloc_coherent(&dev->pdev->dev,
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size, &t, GFP_KERNEL);
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if (!buf->u.direct.buf)
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return -ENOMEM;
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buf->u.direct.map = t;
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while (t & ((1 << buf->page_shift) - 1)) {
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--buf->page_shift;
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buf->npages *= 2;
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}
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memset(buf->u.direct.buf, 0, size);
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} else {
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int i;
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buf->nbufs = (size + PAGE_SIZE - 1) / PAGE_SIZE;
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buf->npages = buf->nbufs;
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buf->page_shift = PAGE_SHIFT;
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buf->u.page_list = kzalloc(buf->nbufs * sizeof *buf->u.page_list,
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GFP_KERNEL);
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if (!buf->u.page_list)
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return -ENOMEM;
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for (i = 0; i < buf->nbufs; ++i) {
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buf->u.page_list[i].buf =
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dma_alloc_coherent(&dev->pdev->dev, PAGE_SIZE,
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&t, GFP_KERNEL);
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if (!buf->u.page_list[i].buf)
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goto err_free;
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buf->u.page_list[i].map = t;
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memset(buf->u.page_list[i].buf, 0, PAGE_SIZE);
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}
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}
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return 0;
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err_free:
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mlx4_buf_free(dev, size, buf);
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return -ENOMEM;
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}
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EXPORT_SYMBOL_GPL(mlx4_buf_alloc);
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void mlx4_buf_free(struct mlx4_dev *dev, int size, struct mlx4_buf *buf)
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{
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int i;
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if (buf->nbufs == 1)
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dma_free_coherent(&dev->pdev->dev, size, buf->u.direct.buf,
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buf->u.direct.map);
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else {
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for (i = 0; i < buf->nbufs; ++i)
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2007-11-13 16:26:57 -07:00
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if (buf->u.page_list[i].buf)
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dma_free_coherent(&dev->pdev->dev, PAGE_SIZE,
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buf->u.page_list[i].buf,
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buf->u.page_list[i].map);
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2007-05-08 19:00:38 -06:00
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kfree(buf->u.page_list);
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}
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}
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EXPORT_SYMBOL_GPL(mlx4_buf_free);
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