2 * Copyright (c) 2010 Isilon Systems, Inc.
3 * Copyright (c) 2010 iX Systems, Inc.
4 * Copyright (c) 2010 Panasas, Inc.
5 * Copyright (c) 2013-2017 Mellanox Technologies, Ltd.
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
11 * 1. Redistributions of source code must retain the above copyright
12 * notice unmodified, this list of conditions, and the following
14 * 2. Redistributions in binary form must reproduce the above copyright
15 * notice, this list of conditions and the following disclaimer in the
16 * documentation and/or other materials provided with the distribution.
18 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
19 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
20 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
21 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
22 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
23 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
24 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
25 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
26 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
27 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
34 #include <sys/cdefs.h>
35 #include <sys/types.h>
36 #include <sys/systm.h>
37 #include <sys/malloc.h>
39 #include <linux/page.h>
41 #include <vm/vm_param.h>
42 #include <vm/vm_object.h>
43 #include <vm/vm_extern.h>
44 #include <vm/vm_kern.h>
46 #define __GFP_NOWARN 0
47 #define __GFP_HIGHMEM 0
48 #define __GFP_ZERO M_ZERO
49 #define __GFP_NORETRY 0
50 #define __GFP_RECLAIM 0
51 #define __GFP_RECLAIMABLE 0
54 #define __GFP_NO_KSWAPD 0
55 #define __GFP_WAIT M_WAITOK
56 #define __GFP_DMA32 (1U << 24) /* LinuxKPI only */
57 #define __GFP_BITS_SHIFT 25
58 #define __GFP_BITS_MASK ((1 << __GFP_BITS_SHIFT) - 1)
60 #define GFP_NOWAIT M_NOWAIT
61 #define GFP_ATOMIC (M_NOWAIT | M_USE_RESERVE)
62 #define GFP_KERNEL M_WAITOK
63 #define GFP_USER M_WAITOK
64 #define GFP_HIGHUSER M_WAITOK
65 #define GFP_HIGHUSER_MOVABLE M_WAITOK
66 #define GFP_IOFS M_NOWAIT
67 #define GFP_NOIO M_NOWAIT
68 #define GFP_DMA32 __GFP_DMA32
69 #define GFP_TEMPORARY M_NOWAIT
70 #define GFP_NATIVE_MASK (M_NOWAIT | M_WAITOK | M_USE_RESERVE | M_ZERO)
72 CTASSERT((__GFP_DMA32 & GFP_NATIVE_MASK) == 0);
73 CTASSERT((__GFP_BITS_MASK & GFP_NATIVE_MASK) == GFP_NATIVE_MASK);
76 * Resolve a page into a virtual address:
78 * NOTE: This function only works for pages allocated by the kernel.
80 extern void *linux_page_address(struct page *);
82 #define page_address(page) linux_page_address(page)
85 * Page management for unmapped pages:
87 extern vm_page_t linux_alloc_pages(gfp_t flags, unsigned int order);
88 extern void linux_free_pages(vm_page_t page, unsigned int order);
90 static inline struct page *
91 alloc_page(gfp_t flags)
94 return (linux_alloc_pages(flags, 0));
97 static inline struct page *
98 alloc_pages(gfp_t flags, unsigned int order)
101 return (linux_alloc_pages(flags, order));
104 static inline struct page *
105 alloc_pages_node(int node_id, gfp_t flags, unsigned int order)
108 return (linux_alloc_pages(flags, order));
112 __free_pages(struct page *page, unsigned int order)
115 linux_free_pages(page, order);
119 __free_page(struct page *page)
122 linux_free_pages(page, 0);
126 * Page management for mapped pages:
128 extern vm_offset_t linux_alloc_kmem(gfp_t flags, unsigned int order);
129 extern void linux_free_kmem(vm_offset_t, unsigned int order);
131 static inline vm_offset_t
132 get_zeroed_page(gfp_t flags)
135 return (linux_alloc_kmem(flags | __GFP_ZERO, 0));
138 static inline vm_offset_t
139 __get_free_page(gfp_t flags)
142 return (linux_alloc_kmem(flags, 0));
145 static inline vm_offset_t
146 __get_free_pages(gfp_t flags, unsigned int order)
149 return (linux_alloc_kmem(flags, order));
153 free_pages(uintptr_t addr, unsigned int order)
158 linux_free_kmem(addr, order);
162 free_page(uintptr_t addr)
167 linux_free_kmem(addr, 0);
171 gfpflags_allow_blocking(const gfp_t gfp_flags)
173 return ((gfp_flags & (M_WAITOK | M_NOWAIT)) == M_WAITOK);
176 #define SetPageReserved(page) do { } while (0) /* NOP */
177 #define ClearPageReserved(page) do { } while (0) /* NOP */
179 #endif /* _LINUX_GFP_H_ */