1322810Shselasky/*- 2322810Shselasky * Copyright (c) 2013-2015, Mellanox Technologies, Ltd. All rights reserved. 3322810Shselasky * 4322810Shselasky * Redistribution and use in source and binary forms, with or without 5322810Shselasky * modification, are permitted provided that the following conditions 6322810Shselasky * are met: 7322810Shselasky * 1. Redistributions of source code must retain the above copyright 8322810Shselasky * notice, this list of conditions and the following disclaimer. 9322810Shselasky * 2. Redistributions in binary form must reproduce the above copyright 10322810Shselasky * notice, this list of conditions and the following disclaimer in the 11322810Shselasky * documentation and/or other materials provided with the distribution. 12322810Shselasky * 13322810Shselasky * THIS SOFTWARE IS PROVIDED BY AUTHOR AND CONTRIBUTORS `AS IS' AND 14322810Shselasky * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 15322810Shselasky * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 16322810Shselasky * ARE DISCLAIMED. IN NO EVENT SHALL AUTHOR OR CONTRIBUTORS BE LIABLE 17322810Shselasky * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 18322810Shselasky * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 19322810Shselasky * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 20322810Shselasky * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 21322810Shselasky * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 22322810Shselasky * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 23322810Shselasky * SUCH DAMAGE. 24322810Shselasky * 25322810Shselasky * $FreeBSD: stable/11/sys/dev/mlx5/mlx5_ib/mlx5_ib_doorbell.c 331769 2018-03-30 18:06:29Z hselasky $ 26322810Shselasky */ 27322810Shselasky 28322810Shselasky#include <linux/kref.h> 29322810Shselasky#include <linux/slab.h> 30322810Shselasky#include <rdma/ib_umem.h> 31322810Shselasky 32322810Shselasky#include "mlx5_ib.h" 33322810Shselasky 34322810Shselaskystruct mlx5_ib_user_db_page { 35322810Shselasky struct list_head list; 36322810Shselasky struct ib_umem *umem; 37331769Shselasky unsigned long user_virt; 38322810Shselasky int refcnt; 39322810Shselasky}; 40322810Shselasky 41331769Shselaskyint mlx5_ib_db_map_user(struct mlx5_ib_ucontext *context, unsigned long virt, 42322810Shselasky struct mlx5_db *db) 43322810Shselasky{ 44322810Shselasky struct mlx5_ib_user_db_page *page; 45322810Shselasky int err = 0; 46322810Shselasky 47322810Shselasky mutex_lock(&context->db_page_mutex); 48322810Shselasky 49322810Shselasky list_for_each_entry(page, &context->db_page_list, list) 50322810Shselasky if (page->user_virt == (virt & PAGE_MASK)) 51322810Shselasky goto found; 52322810Shselasky 53322810Shselasky page = kmalloc(sizeof(*page), GFP_KERNEL); 54322810Shselasky if (!page) { 55322810Shselasky err = -ENOMEM; 56322810Shselasky goto out; 57322810Shselasky } 58322810Shselasky 59322810Shselasky page->user_virt = (virt & PAGE_MASK); 60322810Shselasky page->refcnt = 0; 61322810Shselasky page->umem = ib_umem_get(&context->ibucontext, virt & PAGE_MASK, 62322810Shselasky PAGE_SIZE, 0, 0); 63322810Shselasky if (IS_ERR(page->umem)) { 64322810Shselasky err = PTR_ERR(page->umem); 65322810Shselasky kfree(page); 66322810Shselasky goto out; 67322810Shselasky } 68322810Shselasky 69322810Shselasky list_add(&page->list, &context->db_page_list); 70322810Shselasky 71322810Shselaskyfound: 72322810Shselasky db->dma = sg_dma_address(page->umem->sg_head.sgl) + (virt & ~PAGE_MASK); 73322810Shselasky db->u.user_page = page; 74322810Shselasky ++page->refcnt; 75322810Shselasky 76322810Shselaskyout: 77322810Shselasky mutex_unlock(&context->db_page_mutex); 78322810Shselasky 79322810Shselasky return err; 80322810Shselasky} 81322810Shselasky 82322810Shselaskyvoid mlx5_ib_db_unmap_user(struct mlx5_ib_ucontext *context, struct mlx5_db *db) 83322810Shselasky{ 84322810Shselasky mutex_lock(&context->db_page_mutex); 85322810Shselasky 86322810Shselasky if (!--db->u.user_page->refcnt) { 87322810Shselasky list_del(&db->u.user_page->list); 88322810Shselasky ib_umem_release(db->u.user_page->umem); 89322810Shselasky kfree(db->u.user_page); 90322810Shselasky } 91322810Shselasky 92322810Shselasky mutex_unlock(&context->db_page_mutex); 93322810Shselasky} 94