1 /*
2 * Copyright (c) 2015-2020 François Tigeot <ftigeot@wolfpond.org>
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice unmodified, this list of conditions, and the following
10 * disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
16 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
17 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
18 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
19 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
20 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
21 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
22 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
23 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
24 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
25 */
26
27 #ifndef _LINUX_GFP_H_
28 #define _LINUX_GFP_H_
29
30 #include <linux/mmdebug.h>
31 #include <linux/mmzone.h>
32 #include <linux/stddef.h>
33
34 #include <sys/malloc.h>
35 #include <vm/vm_page.h>
36 #include <machine/bus_dma.h>
37
38 #define GFP_NOWAIT (M_NOWAIT | M_CACHEALIGN)
39 #define GFP_ATOMIC (M_NOWAIT | M_CACHEALIGN)
40 #define GFP_KERNEL (M_WAITOK | M_CACHEALIGN)
41 #define GFP_TEMPORARY GFP_KERNEL
42 #define GFP_USER GFP_KERNEL
43 #define GFP_HIGHUSER GFP_KERNEL
44
45 #define __GFP_ZERO M_ZERO
46 #define __GFP_NORETRY M_NULLOK
47 #define __GFP_RETRY_MAYFAIL M_NULLOK
48
49 #define __GFP_HIGHMEM 0u /* No particular meaning on DragonFly */
50 #define __GFP_IO 0u /* No particular meaning on DragonFly */
51 #define __GFP_RECLAIM 0u
52 #define __GFP_RECLAIMABLE 0u
53 #define __GFP_NOWARN 0u
54 #define __GFP_NOFAIL 0u
55
56 #define __GFP_DMA32 0x10000u /* XXX: MUST NOT collide with the M_XXX definitions */
57 #define GFP_DMA32 __GFP_DMA32
58
__free_page(struct page * page)59 static inline void __free_page(struct page *page)
60 {
61 vm_page_free_contig((struct vm_page *)page, PAGE_SIZE);
62 }
63
alloc_page(int flags)64 static inline struct page * alloc_page(int flags)
65 {
66 vm_paddr_t high = ~0LLU;
67
68 if (flags & GFP_DMA32)
69 high = BUS_SPACE_MAXADDR_32BIT;
70
71 return (struct page *)vm_page_alloc_contig(0LLU, ~0LLU,
72 PAGE_SIZE, PAGE_SIZE, PAGE_SIZE,
73 VM_MEMATTR_DEFAULT);
74 }
75
76 static inline bool
gfpflags_allow_blocking(const gfp_t flags)77 gfpflags_allow_blocking(const gfp_t flags)
78 {
79 return (flags & M_WAITOK);
80 }
81
82 /*
83 * Allocate multiple contiguous pages. The DragonFly code can only do
84 * multiple allocations via the free page reserve. Linux does not appear
85 * to restrict the address space, so neither do we.
86 */
87 static inline struct page *
alloc_pages(gfp_t gfp_mask,unsigned int order)88 alloc_pages(gfp_t gfp_mask, unsigned int order)
89 {
90 size_t bytes = PAGE_SIZE << order;
91 struct vm_page *pgs;
92
93 pgs = vm_page_alloc_contig(0LLU, ~0LLU, bytes, bytes, bytes,
94 VM_MEMATTR_DEFAULT);
95
96 return (struct page*)pgs;
97 }
98
99 /*
100 * Free multiple contiguous pages
101 */
102 static inline void
__free_pages(struct page * pgs,unsigned int order)103 __free_pages(struct page *pgs, unsigned int order)
104 {
105 size_t bytes = PAGE_SIZE << order;
106
107 vm_page_free_contig((struct vm_page *)pgs, bytes);
108 }
109
110 #endif /* _LINUX_GFP_H_ */
111