mlx4_ib_doorbell.c

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    1 /*
    2  * Copyright (c) 2007 Cisco Systems, Inc. All rights reserved.
    3  *
    4  * This software is available to you under a choice of one of two
    5  * licenses.  You may choose to be licensed under the terms of the GNU
    6  * General Public License (GPL) Version 2, available from the file
    7  * COPYING in the main directory of this source tree, or the
    8  * OpenIB.org BSD license below:
    9  *
   10  *     Redistribution and use in source and binary forms, with or
   11  *     without modification, are permitted provided that the following
   12  *     conditions are met:
   13  *
   14  *      - Redistributions of source code must retain the above
   15  *        copyright notice, this list of conditions and the following
   16  *        disclaimer.
   17  *
   18  *      - Redistributions in binary form must reproduce the above
   19  *        copyright notice, this list of conditions and the following
   20  *        disclaimer in the documentation and/or other materials
   21  *        provided with the distribution.
   22  *
   23  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
   24  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
   25  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
   26  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
   27  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
   28  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
   29  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
   30  * SOFTWARE.
   31  */
   32 
   33 #include <linux/slab.h>
   34 
   35 #include "mlx4_ib.h"
   36 
   37 struct mlx4_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 mlx4_ib_db_map_user(struct mlx4_ib_ucontext *context, unsigned long virt,
   45                         struct mlx4_db *db)
   46 {
   47         struct mlx4_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 mlx4_ib_db_unmap_user(struct mlx4_ib_ucontext *context, struct mlx4_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/mlx4/mlx4_ib/mlx4_ib_doorbell.c

FreeBSD/Linux Kernel Cross Reference
sys/dev/mlx4/mlx4_ib/mlx4_ib_doorbell.c