1/*-
2 * SPDX-License-Identifier: BSD-2-Clause
3 *
4 * Copyright (c) 2010 Isilon Systems, Inc.
5 * Copyright (c) 2016 Matthew Macy (mmacy@mattmacy.io)
6 * Copyright (c) 2017 Mellanox Technologies, Ltd.
7 * Copyright (c) 2021 Vladimir Kondratyev <wulf@FreeBSD.org>
8 *
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions are
11 * met:
12 * 1. Redistributions of source code must retain the above copyright
13 *    notice, this list of conditions and the following disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 *    notice, this list of conditions and the following disclaimer in
16 *    the documentation and/or other materials provided with the
17 *    distribution.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 * SUCH DAMAGE.
30 */
31
32#ifndef _LINUXKPI_LINUX_HIGHMEM_H_
33#define _LINUXKPI_LINUX_HIGHMEM_H_
34
35#include <sys/types.h>
36#include <sys/lock.h>
37#include <sys/mutex.h>
38#include <sys/proc.h>
39#include <sys/sched.h>
40#include <sys/sf_buf.h>
41
42#include <vm/vm.h>
43#include <vm/vm_page.h>
44#include <vm/pmap.h>
45
46#include <linux/page.h>
47
48#define	PageHighMem(p)		(0)
49
50static inline struct page *
51kmap_to_page(void *addr)
52{
53
54	return (virt_to_page(addr));
55}
56
57static inline void *
58kmap(struct page *page)
59{
60	struct sf_buf *sf;
61
62	if (PMAP_HAS_DMAP) {
63		return ((void *)PHYS_TO_DMAP(page_to_phys(page)));
64	} else {
65		sched_pin();
66		sf = sf_buf_alloc(page, SFB_NOWAIT | SFB_CPUPRIVATE);
67		if (sf == NULL) {
68			sched_unpin();
69			return (NULL);
70		}
71		return ((void *)sf_buf_kva(sf));
72	}
73}
74
75static inline void *
76kmap_atomic_prot(struct page *page, pgprot_t prot)
77{
78	vm_memattr_t attr = pgprot2cachemode(prot);
79
80	if (attr != VM_MEMATTR_DEFAULT) {
81		vm_page_lock(page);
82		page->flags |= PG_FICTITIOUS;
83		vm_page_unlock(page);
84		pmap_page_set_memattr(page, attr);
85	}
86	return (kmap(page));
87}
88
89static inline void *
90kmap_atomic(struct page *page)
91{
92
93	return (kmap_atomic_prot(page, VM_PROT_ALL));
94}
95
96static inline void *
97kmap_local_page_prot(struct page *page, pgprot_t prot)
98{
99
100	return (kmap_atomic_prot(page, prot));
101}
102
103static inline void
104kunmap(struct page *page)
105{
106	struct sf_buf *sf;
107
108	if (!PMAP_HAS_DMAP) {
109		/* lookup SF buffer in list */
110		sf = sf_buf_alloc(page, SFB_NOWAIT | SFB_CPUPRIVATE);
111
112		/* double-free */
113		sf_buf_free(sf);
114		sf_buf_free(sf);
115
116		sched_unpin();
117	}
118}
119
120static inline void
121kunmap_atomic(void *vaddr)
122{
123
124	if (!PMAP_HAS_DMAP)
125		kunmap(virt_to_page(vaddr));
126}
127
128static inline void
129kunmap_local(void *addr)
130{
131
132	kunmap_atomic(addr);
133}
134
135#endif	/* _LINUXKPI_LINUX_HIGHMEM_H_ */
136