mlx5_ib_doorbell.c

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    1 /*-
    2  * Copyright (c) 2013-2015, Mellanox Technologies, Ltd.  All rights reserved.
    3  *
    4  * Redistribution and use in source and binary forms, with or without
    5  * modification, are permitted provided that the following conditions
    6  * are met:
    7  * 1. Redistributions of source code must retain the above copyright
    8  *    notice, this list of conditions and the following disclaimer.
    9  * 2. Redistributions in binary form must reproduce the above copyright
   10  *    notice, this list of conditions and the following disclaimer in the
   11  *    documentation and/or other materials provided with the distribution.
   12  *
   13  * THIS SOFTWARE IS PROVIDED BY AUTHOR AND CONTRIBUTORS `AS IS' AND
   14  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   15  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   16  * ARE DISCLAIMED.  IN NO EVENT SHALL AUTHOR OR CONTRIBUTORS BE LIABLE
   17  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   18  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   19  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   20  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   21  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   22  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   23  * SUCH DAMAGE.
   24  *
   25  * $FreeBSD$
   26  */
   27 
   28 #include "opt_rss.h"
   29 #include "opt_ratelimit.h"
   30 
   31 #include <linux/kref.h>
   32 #include <linux/slab.h>
   33 #include <rdma/ib_umem.h>
   34 
   35 #include <dev/mlx5/mlx5_ib/mlx5_ib.h>
   36 
   37 struct mlx5_ib_user_db_page {
   38         struct list_head        list;
   39         struct ib_umem         *umem;
   40         unsigned long           user_virt;
   41         int                     refcnt;
   42 };
   43 
   44 int mlx5_ib_db_map_user(struct mlx5_ib_ucontext *context, unsigned long virt,
   45                         struct mlx5_db *db)
   46 {
   47         struct mlx5_ib_user_db_page *page;
   48         int err = 0;
   49 
   50         mutex_lock(&context->db_page_mutex);
   51 
   52         list_for_each_entry(page, &context->db_page_list, list)
   53                 if (page->user_virt == (virt & PAGE_MASK))
   54                         goto found;
   55 
   56         page = kmalloc(sizeof(*page), GFP_KERNEL);
   57         if (!page) {
   58                 err = -ENOMEM;
   59                 goto out;
   60         }
   61 
   62         page->user_virt = (virt & PAGE_MASK);
   63         page->refcnt    = 0;
   64         page->umem      = ib_umem_get(&context->ibucontext, virt & PAGE_MASK,
   65                                       PAGE_SIZE, 0, 0);
   66         if (IS_ERR(page->umem)) {
   67                 err = PTR_ERR(page->umem);
   68                 kfree(page);
   69                 goto out;
   70         }
   71 
   72         list_add(&page->list, &context->db_page_list);
   73 
   74 found:
   75         db->dma = sg_dma_address(page->umem->sg_head.sgl) + (virt & ~PAGE_MASK);
   76         db->u.user_page = page;
   77         ++page->refcnt;
   78 
   79 out:
   80         mutex_unlock(&context->db_page_mutex);
   81 
   82         return err;
   83 }
   84 
   85 void mlx5_ib_db_unmap_user(struct mlx5_ib_ucontext *context, struct mlx5_db *db)
   86 {
   87         mutex_lock(&context->db_page_mutex);
   88 
   89         if (!--db->u.user_page->refcnt) {
   90                 list_del(&db->u.user_page->list);
   91                 ib_umem_release(db->u.user_page->umem);
   92                 kfree(db->u.user_page);
   93         }
   94 
   95         mutex_unlock(&context->db_page_mutex);
   96 }

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FreeBSD/Linux Kernel Cross Reference sys/dev/mlx5/mlx5_ib/mlx5_ib_doorbell.c

FreeBSD/Linux Kernel Cross Reference
sys/dev/mlx5/mlx5_ib/mlx5_ib_doorbell.c