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99 lines
2.8 KiB
99 lines
2.8 KiB
/* |
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* Copyright (c) 2013-2015, Mellanox Technologies. All rights reserved. |
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* |
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* This software is available to you under a choice of one of two |
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* licenses. You may choose to be licensed under the terms of the GNU |
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* General Public License (GPL) Version 2, available from the file |
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* COPYING in the main directory of this source tree, or the |
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* OpenIB.org BSD license below: |
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* |
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* Redistribution and use in source and binary forms, with or |
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* without modification, are permitted provided that the following |
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* conditions are met: |
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* |
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* - Redistributions of source code must retain the above |
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* copyright notice, this list of conditions and the following |
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* disclaimer. |
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* |
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* - Redistributions in binary form must reproduce the above |
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* copyright notice, this list of conditions and the following |
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* disclaimer in the documentation and/or other materials |
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* provided with the distribution. |
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* |
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, |
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF |
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND |
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS |
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* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN |
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* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN |
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* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE |
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* SOFTWARE. |
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*/ |
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#include <linux/kref.h> |
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#include <linux/slab.h> |
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#include <rdma/ib_umem.h> |
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#include "mlx5_ib.h" |
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struct mlx5_ib_user_db_page { |
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struct list_head list; |
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struct ib_umem *umem; |
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unsigned long user_virt; |
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int refcnt; |
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}; |
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int mlx5_ib_db_map_user(struct mlx5_ib_ucontext *context, |
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struct ib_udata *udata, unsigned long virt, |
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struct mlx5_db *db) |
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{ |
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struct mlx5_ib_user_db_page *page; |
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int err = 0; |
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mutex_lock(&context->db_page_mutex); |
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list_for_each_entry(page, &context->db_page_list, list) |
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if (page->user_virt == (virt & PAGE_MASK)) |
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goto found; |
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page = kmalloc(sizeof(*page), GFP_KERNEL); |
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if (!page) { |
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err = -ENOMEM; |
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goto out; |
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} |
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page->user_virt = (virt & PAGE_MASK); |
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page->refcnt = 0; |
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page->umem = ib_umem_get(context->ibucontext.device, virt & PAGE_MASK, |
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PAGE_SIZE, 0); |
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if (IS_ERR(page->umem)) { |
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err = PTR_ERR(page->umem); |
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kfree(page); |
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goto out; |
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} |
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list_add(&page->list, &context->db_page_list); |
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found: |
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db->dma = sg_dma_address(page->umem->sg_head.sgl) + (virt & ~PAGE_MASK); |
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db->u.user_page = page; |
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++page->refcnt; |
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out: |
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mutex_unlock(&context->db_page_mutex); |
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return err; |
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} |
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void mlx5_ib_db_unmap_user(struct mlx5_ib_ucontext *context, struct mlx5_db *db) |
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{ |
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mutex_lock(&context->db_page_mutex); |
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if (!--db->u.user_page->refcnt) { |
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list_del(&db->u.user_page->list); |
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ib_umem_release(db->u.user_page->umem); |
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kfree(db->u.user_page); |
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} |
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mutex_unlock(&context->db_page_mutex); |
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}
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