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