144 lines
4.0 KiB
C
144 lines
4.0 KiB
C
/*
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* Copyright (c) 2004 Topspin Communications. All rights reserved.
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* Copyright (c) 2005 Open Grid Computing, 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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#include "c2.h"
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static int c2_alloc_mqsp_chunk(struct c2_dev *c2dev, gfp_t gfp_mask,
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struct sp_chunk **head)
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{
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int i;
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struct sp_chunk *new_head;
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dma_addr_t dma_addr;
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new_head = dma_alloc_coherent(&c2dev->pcidev->dev, PAGE_SIZE,
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&dma_addr, gfp_mask);
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if (new_head == NULL)
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return -ENOMEM;
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new_head->dma_addr = dma_addr;
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pci_unmap_addr_set(new_head, mapping, new_head->dma_addr);
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new_head->next = NULL;
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new_head->head = 0;
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/* build list where each index is the next free slot */
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for (i = 0;
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i < (PAGE_SIZE - sizeof(struct sp_chunk) -
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sizeof(u16)) / sizeof(u16) - 1;
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i++) {
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new_head->shared_ptr[i] = i + 1;
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}
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/* terminate list */
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new_head->shared_ptr[i] = 0xFFFF;
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*head = new_head;
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return 0;
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}
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int c2_init_mqsp_pool(struct c2_dev *c2dev, gfp_t gfp_mask,
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struct sp_chunk **root)
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{
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return c2_alloc_mqsp_chunk(c2dev, gfp_mask, root);
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}
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void c2_free_mqsp_pool(struct c2_dev *c2dev, struct sp_chunk *root)
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{
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struct sp_chunk *next;
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while (root) {
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next = root->next;
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dma_free_coherent(&c2dev->pcidev->dev, PAGE_SIZE, root,
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pci_unmap_addr(root, mapping));
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root = next;
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}
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}
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__be16 *c2_alloc_mqsp(struct c2_dev *c2dev, struct sp_chunk *head,
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dma_addr_t *dma_addr, gfp_t gfp_mask)
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{
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u16 mqsp;
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while (head) {
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mqsp = head->head;
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if (mqsp != 0xFFFF) {
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head->head = head->shared_ptr[mqsp];
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break;
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} else if (head->next == NULL) {
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if (c2_alloc_mqsp_chunk(c2dev, gfp_mask, &head->next) ==
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0) {
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head = head->next;
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mqsp = head->head;
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head->head = head->shared_ptr[mqsp];
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break;
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} else
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return NULL;
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} else
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head = head->next;
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}
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if (head) {
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*dma_addr = head->dma_addr +
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((unsigned long) &(head->shared_ptr[mqsp]) -
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(unsigned long) head);
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pr_debug("%s addr %p dma_addr %llx\n", __func__,
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&(head->shared_ptr[mqsp]), (unsigned long long) *dma_addr);
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return (__force __be16 *) &(head->shared_ptr[mqsp]);
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}
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return NULL;
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}
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void c2_free_mqsp(__be16 *mqsp)
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{
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struct sp_chunk *head;
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u16 idx;
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/* The chunk containing this ptr begins at the page boundary */
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head = (struct sp_chunk *) ((unsigned long) mqsp & PAGE_MASK);
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/* Link head to new mqsp */
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*mqsp = (__force __be16) head->head;
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/* Compute the shared_ptr index */
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idx = ((unsigned long) mqsp & ~PAGE_MASK) >> 1;
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idx -= (unsigned long) &(((struct sp_chunk *) 0)->shared_ptr[0]) >> 1;
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/* Point this index at the head */
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head->shared_ptr[idx] = head->head;
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/* Point head at this index */
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head->head = idx;
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}
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