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/* * 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. */ #include <linux/errno.h> #include <linux/slab.h> #include <linux/bitmap.h> #include <linux/dma-mapping.h> #include "mlx4.h" u32 mlx4_bitmap_alloc(struct mlx4_bitmap *bitmap) { u32 obj; spin_lock(&bitmap->lock); obj = find_next_zero_bit(bitmap->table, bitmap->max, bitmap->last); if (obj >= bitmap->max) { bitmap->top = (bitmap->top + bitmap->max) & bitmap->mask; obj = find_first_zero_bit(bitmap->table, bitmap->max); } if (obj < bitmap->max) { set_bit(obj, bitmap->table); bitmap->last = (obj + 1) & (bitmap->max - 1); obj |= bitmap->top; } else obj = -1; spin_unlock(&bitmap->lock); return obj; } void mlx4_bitmap_free(struct mlx4_bitmap *bitmap, u32 obj) { obj &= bitmap->max - 1; spin_lock(&bitmap->lock); clear_bit(obj, bitmap->table); bitmap->last = min(bitmap->last, obj); bitmap->top = (bitmap->top + bitmap->max) & bitmap->mask; spin_unlock(&bitmap->lock); } int mlx4_bitmap_init(struct mlx4_bitmap *bitmap, u32 num, u32 mask, u32 reserved) { int i; /* num must be a power of 2 */ if (num != roundup_pow_of_two(num)) return -EINVAL; bitmap->last = 0; bitmap->top = 0; bitmap->max = num; bitmap->mask = mask; spin_lock_init(&bitmap->lock); bitmap->table = kzalloc(BITS_TO_LONGS(num) * sizeof (long), GFP_KERNEL); if (!bitmap->table) return -ENOMEM; for (i = 0; i < reserved; ++i) set_bit(i, bitmap->table); return 0; } void mlx4_bitmap_cleanup(struct mlx4_bitmap *bitmap) { kfree(bitmap->table); } /* * 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 mlx4_buf_alloc(struct mlx4_dev *dev, int size, int max_direct, struct mlx4_buf *buf) { dma_addr_t t; if (size <= max_direct) { buf->nbufs = 1; buf->npages = 1; buf->page_shift = get_order(size) + PAGE_SHIFT; buf->u.direct.buf = dma_alloc_coherent(&dev->pdev->dev, size, &t, GFP_KERNEL); if (!buf->u.direct.buf) return -ENOMEM; buf->u.direct.map = t; while (t & ((1 << buf->page_shift) - 1)) { --buf->page_shift; buf->npages *= 2; } memset(buf->u.direct.buf, 0, size); } else { int i; buf->nbufs = (size + PAGE_SIZE - 1) / PAGE_SIZE; buf->npages = buf->nbufs; buf->page_shift = PAGE_SHIFT; buf->u.page_list = kzalloc(buf->nbufs * sizeof *buf->u.page_list, GFP_KERNEL); if (!buf->u.page_list) return -ENOMEM; for (i = 0; i < buf->nbufs; ++i) { buf->u.page_list[i].buf = dma_alloc_coherent(&dev->pdev->dev, PAGE_SIZE, &t, GFP_KERNEL); if (!buf->u.page_list[i].buf) goto err_free; buf->u.page_list[i].map = t; memset(buf->u.page_list[i].buf, 0, PAGE_SIZE); } if (BITS_PER_LONG == 64) { struct page **pages; pages = kmalloc(sizeof *pages * buf->nbufs, GFP_KERNEL); if (!pages) goto err_free; for (i = 0; i < buf->nbufs; ++i) pages[i] = virt_to_page(buf->u.page_list[i].buf); buf->u.direct.buf = vmap(pages, buf->nbufs, VM_MAP, PAGE_KERNEL); kfree(pages); if (!buf->u.direct.buf) goto err_free; } } return 0; err_free: mlx4_buf_free(dev, size, buf); return -ENOMEM; } EXPORT_SYMBOL_GPL(mlx4_buf_alloc); void mlx4_buf_free(struct mlx4_dev *dev, int size, struct mlx4_buf *buf) { int i; if (buf->nbufs == 1) dma_free_coherent(&dev->pdev->dev, size, buf->u.direct.buf, buf->u.direct.map); else { if (BITS_PER_LONG == 64) vunmap(buf->u.direct.buf); for (i = 0; i < buf->nbufs; ++i) if (buf->u.page_list[i].buf) dma_free_coherent(&dev->pdev->dev, PAGE_SIZE, buf->u.page_list[i].buf, buf->u.page_list[i].map); kfree(buf->u.page_list); } } EXPORT_SYMBOL_GPL(mlx4_buf_free);
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