99 lines
2.8 KiB
C
99 lines
2.8 KiB
C
/*
|
|
* Copyright (c) 2013-2015, Mellanox Technologies. 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/kref.h>
|
|
#include <linux/slab.h>
|
|
#include <rdma/ib_umem.h>
|
|
|
|
#include "mlx5_ib.h"
|
|
|
|
struct mlx5_ib_user_db_page {
|
|
struct list_head list;
|
|
struct ib_umem *umem;
|
|
unsigned long user_virt;
|
|
int refcnt;
|
|
};
|
|
|
|
int mlx5_ib_db_map_user(struct mlx5_ib_ucontext *context, unsigned long virt,
|
|
struct mlx5_db *db)
|
|
{
|
|
struct mlx5_ib_user_db_page *page;
|
|
int err = 0;
|
|
|
|
mutex_lock(&context->db_page_mutex);
|
|
|
|
list_for_each_entry(page, &context->db_page_list, list)
|
|
if (page->user_virt == (virt & PAGE_MASK))
|
|
goto found;
|
|
|
|
page = kmalloc(sizeof(*page), GFP_KERNEL);
|
|
if (!page) {
|
|
err = -ENOMEM;
|
|
goto out;
|
|
}
|
|
|
|
page->user_virt = (virt & PAGE_MASK);
|
|
page->refcnt = 0;
|
|
page->umem = ib_umem_get(&context->ibucontext, virt & PAGE_MASK,
|
|
PAGE_SIZE, 0, 0);
|
|
if (IS_ERR(page->umem)) {
|
|
err = PTR_ERR(page->umem);
|
|
kfree(page);
|
|
goto out;
|
|
}
|
|
|
|
list_add(&page->list, &context->db_page_list);
|
|
|
|
found:
|
|
db->dma = sg_dma_address(page->umem->sg_head.sgl) + (virt & ~PAGE_MASK);
|
|
db->u.user_page = page;
|
|
++page->refcnt;
|
|
|
|
out:
|
|
mutex_unlock(&context->db_page_mutex);
|
|
|
|
return err;
|
|
}
|
|
|
|
void mlx5_ib_db_unmap_user(struct mlx5_ib_ucontext *context, struct mlx5_db *db)
|
|
{
|
|
mutex_lock(&context->db_page_mutex);
|
|
|
|
if (!--db->u.user_page->refcnt) {
|
|
list_del(&db->u.user_page->list);
|
|
ib_umem_release(db->u.user_page->umem);
|
|
kfree(db->u.user_page);
|
|
}
|
|
|
|
mutex_unlock(&context->db_page_mutex);
|
|
}
|