1#ifndef _HFI1_USER_EXP_RCV_H
2#define _HFI1_USER_EXP_RCV_H
3/*
4 * Copyright(c) 2020 - Cornelis Networks, Inc.
5 * Copyright(c) 2015 - 2017 Intel Corporation.
6 *
7 * This file is provided under a dual BSD/GPLv2 license.  When using or
8 * redistributing this file, you may do so under either license.
9 *
10 * GPL LICENSE SUMMARY
11 *
12 * This program is free software; you can redistribute it and/or modify
13 * it under the terms of version 2 of the GNU General Public License as
14 * published by the Free Software Foundation.
15 *
16 * This program is distributed in the hope that it will be useful, but
17 * WITHOUT ANY WARRANTY; without even the implied warranty of
18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
19 * General Public License for more details.
20 *
21 * BSD LICENSE
22 *
23 * Redistribution and use in source and binary forms, with or without
24 * modification, are permitted provided that the following conditions
25 * are met:
26 *
27 *  - Redistributions of source code must retain the above copyright
28 *    notice, this list of conditions and the following disclaimer.
29 *  - Redistributions in binary form must reproduce the above copyright
30 *    notice, this list of conditions and the following disclaimer in
31 *    the documentation and/or other materials provided with the
32 *    distribution.
33 *  - Neither the name of Intel Corporation nor the names of its
34 *    contributors may be used to endorse or promote products derived
35 *    from this software without specific prior written permission.
36 *
37 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
38 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
39 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
40 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
41 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
42 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
43 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
44 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
45 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
46 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
47 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
48 *
49 */
50
51#include "hfi.h"
52#include "exp_rcv.h"
53
54struct tid_pageset {
55	u16 idx;
56	u16 count;
57};
58
59struct tid_user_buf {
60	struct mmu_interval_notifier notifier;
61	struct mutex cover_mutex;
62	unsigned long vaddr;
63	unsigned long length;
64	unsigned int npages;
65	struct page **pages;
66	struct tid_pageset *psets;
67	unsigned int n_psets;
68};
69
70struct tid_rb_node {
71	struct mmu_interval_notifier notifier;
72	struct hfi1_filedata *fdata;
73	struct mutex invalidate_mutex; /* covers hw removal */
74	unsigned long phys;
75	struct tid_group *grp;
76	u32 rcventry;
77	dma_addr_t dma_addr;
78	bool freed;
79	unsigned int npages;
80	struct page *pages[];
81};
82
83static inline int num_user_pages(unsigned long addr,
84				 unsigned long len)
85{
86	const unsigned long spage = addr & PAGE_MASK;
87	const unsigned long epage = (addr + len - 1) & PAGE_MASK;
88
89	return 1 + ((epage - spage) >> PAGE_SHIFT);
90}
91
92int hfi1_user_exp_rcv_init(struct hfi1_filedata *fd,
93			   struct hfi1_ctxtdata *uctxt);
94void hfi1_user_exp_rcv_free(struct hfi1_filedata *fd);
95int hfi1_user_exp_rcv_setup(struct hfi1_filedata *fd,
96			    struct hfi1_tid_info *tinfo);
97int hfi1_user_exp_rcv_clear(struct hfi1_filedata *fd,
98			    struct hfi1_tid_info *tinfo);
99int hfi1_user_exp_rcv_invalid(struct hfi1_filedata *fd,
100			      struct hfi1_tid_info *tinfo);
101
102static inline struct mm_struct *mm_from_tid_node(struct tid_rb_node *node)
103{
104	return node->notifier.mm;
105}
106
107#endif /* _HFI1_USER_EXP_RCV_H */
108