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 #ifndef _LINUXKPI_LINUX_GFP_H_ 30 #define _LINUXKPI_LINUX_GFP_H_ 31 32 #include <sys/types.h> 33 #include <sys/systm.h> 34 #include <sys/malloc.h> 35 36 #include <linux/page.h> 37 38 #include <vm/vm_param.h> 39 #include <vm/vm_object.h> 40 #include <vm/vm_extern.h> 41 #include <vm/vm_kern.h> 42 43 #define __GFP_NOWARN 0 44 #define __GFP_HIGHMEM 0 45 #define __GFP_ZERO M_ZERO 46 #define __GFP_NORETRY 0 47 #define __GFP_NOMEMALLOC 0 48 #define __GFP_RECLAIM 0 49 #define __GFP_RECLAIMABLE 0 50 #define __GFP_RETRY_MAYFAIL 0 51 #define __GFP_MOVABLE 0 52 #define __GFP_COMP 0 53 #define __GFP_KSWAPD_RECLAIM 0 54 55 #define __GFP_IO 0 56 #define __GFP_NO_KSWAPD 0 57 #define __GFP_KSWAPD_RECLAIM 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_NOFS M_NOWAIT 73 #define GFP_DMA32 __GFP_DMA32 74 #define GFP_TEMPORARY M_NOWAIT 75 #define GFP_NATIVE_MASK (M_NOWAIT | M_WAITOK | M_USE_RESERVE | M_ZERO) 76 #define GFP_TRANSHUGE 0 77 #define GFP_TRANSHUGE_LIGHT 0 78 79 CTASSERT((__GFP_DMA32 & GFP_NATIVE_MASK) == 0); 80 CTASSERT((__GFP_BITS_MASK & GFP_NATIVE_MASK) == GFP_NATIVE_MASK); 81 82 struct page_frag_cache { 83 void *va; 84 int pagecnt_bias; 85 }; 86 87 /* 88 * Resolve a page into a virtual address: 89 * 90 * NOTE: This function only works for pages allocated by the kernel. 91 */ 92 extern void *linux_page_address(struct page *); 93 94 #define page_address(page) linux_page_address(page) 95 96 /* 97 * Page management for unmapped pages: 98 */ 99 extern struct page *linux_alloc_pages(gfp_t flags, unsigned int order); 100 extern void linux_free_pages(struct page *page, unsigned int order); 101 void *linuxkpi_page_frag_alloc(struct page_frag_cache *, size_t, gfp_t); 102 void linuxkpi_page_frag_free(void *); 103 void linuxkpi__page_frag_cache_drain(struct page *, size_t); 104 105 static inline struct page * 106 alloc_page(gfp_t flags) 107 { 108 109 return (linux_alloc_pages(flags, 0)); 110 } 111 112 static inline struct page * 113 alloc_pages(gfp_t flags, unsigned int order) 114 { 115 116 return (linux_alloc_pages(flags, order)); 117 } 118 119 static inline struct page * 120 alloc_pages_node(int node_id, gfp_t flags, unsigned int order) 121 { 122 123 return (linux_alloc_pages(flags, order)); 124 } 125 126 static inline void 127 __free_pages(struct page *page, unsigned int order) 128 { 129 130 linux_free_pages(page, order); 131 } 132 133 static inline void 134 __free_page(struct page *page) 135 { 136 137 linux_free_pages(page, 0); 138 } 139 140 static inline struct page * 141 dev_alloc_pages(unsigned int order) 142 { 143 return (linux_alloc_pages(GFP_ATOMIC, order)); 144 } 145 146 /* 147 * Page management for mapped pages: 148 */ 149 extern vm_offset_t linux_alloc_kmem(gfp_t flags, unsigned int order); 150 extern void linux_free_kmem(vm_offset_t, unsigned int order); 151 152 static inline vm_offset_t 153 get_zeroed_page(gfp_t flags) 154 { 155 156 return (linux_alloc_kmem(flags | __GFP_ZERO, 0)); 157 } 158 159 static inline vm_offset_t 160 __get_free_page(gfp_t flags) 161 { 162 163 return (linux_alloc_kmem(flags, 0)); 164 } 165 166 static inline vm_offset_t 167 __get_free_pages(gfp_t flags, unsigned int order) 168 { 169 170 return (linux_alloc_kmem(flags, order)); 171 } 172 173 static inline void 174 free_pages(uintptr_t addr, unsigned int order) 175 { 176 if (addr == 0) 177 return; 178 179 linux_free_kmem(addr, order); 180 } 181 182 static inline void 183 free_page(uintptr_t addr) 184 { 185 if (addr == 0) 186 return; 187 188 linux_free_kmem(addr, 0); 189 } 190 191 static inline void * 192 page_frag_alloc(struct page_frag_cache *pfc, size_t fragsz, gfp_t gfp) 193 { 194 195 return (linuxkpi_page_frag_alloc(pfc, fragsz, gfp)); 196 } 197 198 static inline void 199 page_frag_free(void *addr) 200 { 201 202 linuxkpi_page_frag_free(addr); 203 } 204 205 static inline void 206 __page_frag_cache_drain(struct page *page, size_t count) 207 { 208 209 linuxkpi__page_frag_cache_drain(page, count); 210 } 211 212 static inline bool 213 gfpflags_allow_blocking(const gfp_t gfp_flags) 214 { 215 return ((gfp_flags & (M_WAITOK | M_NOWAIT)) == M_WAITOK); 216 } 217 218 #define SetPageReserved(page) do { } while (0) /* NOP */ 219 #define ClearPageReserved(page) do { } while (0) /* NOP */ 220 221 #endif /* _LINUXKPI_LINUX_GFP_H_ */ 222