299 lines
7.4 KiB
C
299 lines
7.4 KiB
C
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/*
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* Copyright (c) 2004 Topspin Communications. 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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#include "mthca_dev.h"
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/* Trivial bitmap-based allocator */
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u32 mthca_alloc(struct mthca_alloc *alloc)
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{
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unsigned long flags;
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u32 obj;
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spin_lock_irqsave(&alloc->lock, flags);
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obj = find_next_zero_bit(alloc->table, alloc->max, alloc->last);
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if (obj >= alloc->max) {
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alloc->top = (alloc->top + alloc->max) & alloc->mask;
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obj = find_first_zero_bit(alloc->table, alloc->max);
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}
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if (obj < alloc->max) {
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__set_bit(obj, alloc->table);
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obj |= alloc->top;
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} else
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obj = -1;
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spin_unlock_irqrestore(&alloc->lock, flags);
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return obj;
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}
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void mthca_free(struct mthca_alloc *alloc, u32 obj)
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{
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unsigned long flags;
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obj &= alloc->max - 1;
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spin_lock_irqsave(&alloc->lock, flags);
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__clear_bit(obj, alloc->table);
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alloc->last = min(alloc->last, obj);
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alloc->top = (alloc->top + alloc->max) & alloc->mask;
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spin_unlock_irqrestore(&alloc->lock, flags);
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}
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int mthca_alloc_init(struct mthca_alloc *alloc, u32 num, u32 mask,
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u32 reserved)
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{
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/* num must be a power of 2 */
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if (num != 1 << (ffs(num) - 1))
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return -EINVAL;
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alloc->last = 0;
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alloc->top = 0;
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alloc->max = num;
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alloc->mask = mask;
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spin_lock_init(&alloc->lock);
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alloc->table = bitmap_zalloc(num, GFP_KERNEL);
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if (!alloc->table)
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return -ENOMEM;
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bitmap_set(alloc->table, 0, reserved);
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return 0;
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}
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void mthca_alloc_cleanup(struct mthca_alloc *alloc)
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{
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bitmap_free(alloc->table);
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}
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/*
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* Array of pointers with lazy allocation of leaf pages. Callers of
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* _get, _set and _clear methods must use a lock or otherwise
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* serialize access to the array.
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*/
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#define MTHCA_ARRAY_MASK (PAGE_SIZE / sizeof (void *) - 1)
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void *mthca_array_get(struct mthca_array *array, int index)
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{
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int p = (index * sizeof (void *)) >> PAGE_SHIFT;
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if (array->page_list[p].page)
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return array->page_list[p].page[index & MTHCA_ARRAY_MASK];
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else
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return NULL;
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}
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int mthca_array_set(struct mthca_array *array, int index, void *value)
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{
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int p = (index * sizeof (void *)) >> PAGE_SHIFT;
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/* Allocate with GFP_ATOMIC because we'll be called with locks held. */
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if (!array->page_list[p].page)
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array->page_list[p].page = (void **) get_zeroed_page(GFP_ATOMIC);
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if (!array->page_list[p].page)
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return -ENOMEM;
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array->page_list[p].page[index & MTHCA_ARRAY_MASK] = value;
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++array->page_list[p].used;
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return 0;
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}
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void mthca_array_clear(struct mthca_array *array, int index)
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{
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int p = (index * sizeof (void *)) >> PAGE_SHIFT;
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if (--array->page_list[p].used == 0) {
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free_page((unsigned long) array->page_list[p].page);
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array->page_list[p].page = NULL;
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} else
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array->page_list[p].page[index & MTHCA_ARRAY_MASK] = NULL;
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if (array->page_list[p].used < 0)
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pr_debug("Array %p index %d page %d with ref count %d < 0\n",
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array, index, p, array->page_list[p].used);
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}
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int mthca_array_init(struct mthca_array *array, int nent)
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{
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int npage = (nent * sizeof (void *) + PAGE_SIZE - 1) / PAGE_SIZE;
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int i;
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array->page_list = kmalloc_array(npage, sizeof(*array->page_list),
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GFP_KERNEL);
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if (!array->page_list)
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return -ENOMEM;
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for (i = 0; i < npage; ++i) {
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array->page_list[i].page = NULL;
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array->page_list[i].used = 0;
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}
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return 0;
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}
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void mthca_array_cleanup(struct mthca_array *array, int nent)
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{
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int i;
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for (i = 0; i < (nent * sizeof (void *) + PAGE_SIZE - 1) / PAGE_SIZE; ++i)
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free_page((unsigned long) array->page_list[i].page);
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kfree(array->page_list);
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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 mthca_buf_alloc(struct mthca_dev *dev, int size, int max_direct,
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union mthca_buf *buf, int *is_direct, struct mthca_pd *pd,
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int hca_write, struct mthca_mr *mr)
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{
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int err = -ENOMEM;
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int npages, shift;
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u64 *dma_list = NULL;
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dma_addr_t t;
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int i;
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if (size <= max_direct) {
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*is_direct = 1;
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npages = 1;
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shift = get_order(size) + PAGE_SHIFT;
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buf->direct.buf = dma_alloc_coherent(&dev->pdev->dev,
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size, &t, GFP_KERNEL);
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if (!buf->direct.buf)
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return -ENOMEM;
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dma_unmap_addr_set(&buf->direct, mapping, t);
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while (t & ((1 << shift) - 1)) {
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--shift;
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npages *= 2;
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}
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dma_list = kmalloc_array(npages, sizeof(*dma_list),
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GFP_KERNEL);
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if (!dma_list)
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goto err_free;
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for (i = 0; i < npages; ++i)
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dma_list[i] = t + i * (1 << shift);
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} else {
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*is_direct = 0;
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npages = (size + PAGE_SIZE - 1) / PAGE_SIZE;
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shift = PAGE_SHIFT;
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dma_list = kmalloc_array(npages, sizeof(*dma_list),
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GFP_KERNEL);
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if (!dma_list)
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return -ENOMEM;
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buf->page_list = kmalloc_array(npages,
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sizeof(*buf->page_list),
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GFP_KERNEL);
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if (!buf->page_list)
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goto err_out;
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for (i = 0; i < npages; ++i)
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buf->page_list[i].buf = NULL;
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for (i = 0; i < npages; ++i) {
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buf->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->page_list[i].buf)
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goto err_free;
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dma_list[i] = t;
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dma_unmap_addr_set(&buf->page_list[i], mapping, t);
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clear_page(buf->page_list[i].buf);
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}
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}
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err = mthca_mr_alloc_phys(dev, pd->pd_num,
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dma_list, shift, npages,
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0, size,
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MTHCA_MPT_FLAG_LOCAL_READ |
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(hca_write ? MTHCA_MPT_FLAG_LOCAL_WRITE : 0),
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mr);
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if (err)
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goto err_free;
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kfree(dma_list);
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return 0;
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err_free:
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mthca_buf_free(dev, size, buf, *is_direct, NULL);
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err_out:
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kfree(dma_list);
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return err;
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}
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void mthca_buf_free(struct mthca_dev *dev, int size, union mthca_buf *buf,
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int is_direct, struct mthca_mr *mr)
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{
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int i;
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if (mr)
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mthca_free_mr(dev, mr);
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if (is_direct)
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dma_free_coherent(&dev->pdev->dev, size, buf->direct.buf,
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dma_unmap_addr(&buf->direct, mapping));
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else {
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for (i = 0; i < (size + PAGE_SIZE - 1) / PAGE_SIZE; ++i)
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dma_free_coherent(&dev->pdev->dev, PAGE_SIZE,
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buf->page_list[i].buf,
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dma_unmap_addr(&buf->page_list[i],
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mapping));
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kfree(buf->page_list);
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}
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}
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