1 /*- 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. 6 * All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice unmodified, this list of conditions, and the following 13 * disclaimer. 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. 17 * 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. 28 * 29 * $FreeBSD$ 30 */ 31 #ifndef _LINUX_GFP_H_ 32 #define _LINUX_GFP_H_ 33 34 #include <sys/cdefs.h> 35 #include <sys/types.h> 36 #include <sys/systm.h> 37 #include <sys/malloc.h> 38 39 #include <linux/page.h> 40 41 #include <vm/vm_param.h> 42 #include <vm/vm_object.h> 43 #include <vm/vm_extern.h> 44 #include <vm/vm_kern.h> 45 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 52 #define __GFP_RETRY_MAYFAIL 0 53 #define __GFP_MOVABLE 0 54 #define __GFP_COMP 0 55 56 #define __GFP_IO 0 57 #define __GFP_NO_KSWAPD 0 58 #define __GFP_WAIT M_WAITOK 59 #define __GFP_DMA32 (1U << 24) /* LinuxKPI only */ 60 #define __GFP_BITS_SHIFT 25 61 #define __GFP_BITS_MASK ((1 << __GFP_BITS_SHIFT) - 1) 62 #define __GFP_NOFAIL M_WAITOK 63 64 #define GFP_NOWAIT M_NOWAIT 65 #define GFP_ATOMIC (M_NOWAIT | M_USE_RESERVE) 66 #define GFP_KERNEL M_WAITOK 67 #define GFP_USER M_WAITOK 68 #define GFP_HIGHUSER M_WAITOK 69 #define GFP_HIGHUSER_MOVABLE M_WAITOK 70 #define GFP_IOFS M_NOWAIT 71 #define GFP_NOIO M_NOWAIT 72 #define GFP_DMA32 __GFP_DMA32 73 #define GFP_TEMPORARY M_NOWAIT 74 #define GFP_NATIVE_MASK (M_NOWAIT | M_WAITOK | M_USE_RESERVE | M_ZERO) 75 #define GFP_TRANSHUGE 0 76 77 CTASSERT((__GFP_DMA32 & GFP_NATIVE_MASK) == 0); 78 CTASSERT((__GFP_BITS_MASK & GFP_NATIVE_MASK) == GFP_NATIVE_MASK); 79 80 /* 81 * Resolve a page into a virtual address: 82 * 83 * NOTE: This function only works for pages allocated by the kernel. 84 */ 85 extern void *linux_page_address(struct page *); 86 87 #define page_address(page) linux_page_address(page) 88 89 /* 90 * Page management for unmapped pages: 91 */ 92 extern vm_page_t linux_alloc_pages(gfp_t flags, unsigned int order); 93 extern void linux_free_pages(vm_page_t page, unsigned int order); 94 95 static inline struct page * 96 alloc_page(gfp_t flags) 97 { 98 99 return (linux_alloc_pages(flags, 0)); 100 } 101 102 static inline struct page * 103 alloc_pages(gfp_t flags, unsigned int order) 104 { 105 106 return (linux_alloc_pages(flags, order)); 107 } 108 109 static inline struct page * 110 alloc_pages_node(int node_id, gfp_t flags, unsigned int order) 111 { 112 113 return (linux_alloc_pages(flags, order)); 114 } 115 116 static inline void 117 __free_pages(struct page *page, unsigned int order) 118 { 119 120 linux_free_pages(page, order); 121 } 122 123 static inline void 124 __free_page(struct page *page) 125 { 126 127 linux_free_pages(page, 0); 128 } 129 130 /* 131 * Page management for mapped pages: 132 */ 133 extern vm_offset_t linux_alloc_kmem(gfp_t flags, unsigned int order); 134 extern void linux_free_kmem(vm_offset_t, unsigned int order); 135 136 static inline vm_offset_t 137 get_zeroed_page(gfp_t flags) 138 { 139 140 return (linux_alloc_kmem(flags | __GFP_ZERO, 0)); 141 } 142 143 static inline vm_offset_t 144 __get_free_page(gfp_t flags) 145 { 146 147 return (linux_alloc_kmem(flags, 0)); 148 } 149 150 static inline vm_offset_t 151 __get_free_pages(gfp_t flags, unsigned int order) 152 { 153 154 return (linux_alloc_kmem(flags, order)); 155 } 156 157 static inline void 158 free_pages(uintptr_t addr, unsigned int order) 159 { 160 if (addr == 0) 161 return; 162 163 linux_free_kmem(addr, order); 164 } 165 166 static inline void 167 free_page(uintptr_t addr) 168 { 169 if (addr == 0) 170 return; 171 172 linux_free_kmem(addr, 0); 173 } 174 175 static inline bool 176 gfpflags_allow_blocking(const gfp_t gfp_flags) 177 { 178 return ((gfp_flags & (M_WAITOK | M_NOWAIT)) == M_WAITOK); 179 } 180 181 #define SetPageReserved(page) do { } while (0) /* NOP */ 182 #define ClearPageReserved(page) do { } while (0) /* NOP */ 183 184 #endif /* _LINUX_GFP_H_ */ 185