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
50 static inline struct page *
kmap_to_page(void * addr)51 kmap_to_page(void *addr)
52 {
53
54 return (virt_to_page(addr));
55 }
56
57 static inline void *
kmap(struct page * page)58 kmap(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
75 static inline void *
kmap_atomic_prot(struct page * page,pgprot_t prot)76 kmap_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
89 static inline void *
kmap_atomic(struct page * page)90 kmap_atomic(struct page *page)
91 {
92
93 return (kmap_atomic_prot(page, VM_PROT_ALL));
94 }
95
96 static inline void *
kmap_local_page_prot(struct page * page,pgprot_t prot)97 kmap_local_page_prot(struct page *page, pgprot_t prot)
98 {
99
100 return (kmap_atomic_prot(page, prot));
101 }
102
103 static inline void
kunmap(struct page * page)104 kunmap(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
120 static inline void
kunmap_atomic(void * vaddr)121 kunmap_atomic(void *vaddr)
122 {
123
124 if (!PMAP_HAS_DMAP)
125 kunmap(virt_to_page(vaddr));
126 }
127
128 static inline void
kunmap_local(void * addr)129 kunmap_local(void *addr)
130 {
131
132 kunmap_atomic(addr);
133 }
134
135 #endif /* _LINUXKPI_LINUX_HIGHMEM_H_ */
136