gfp.h revision 278681
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 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 30#ifndef _LINUX_GFP_H_ 31#define _LINUX_GFP_H_ 32 33#include <sys/cdefs.h> 34#include <sys/types.h> 35#include <sys/systm.h> 36#include <sys/malloc.h> 37 38#include <linux/page.h> 39 40#include <vm/vm_param.h> 41#include <vm/vm_object.h> 42#include <vm/vm_extern.h> 43#include <vm/vm_kern.h> 44 45#define __GFP_NOWARN 0 46#define __GFP_HIGHMEM 0 47#define __GFP_ZERO M_ZERO 48 49#define GFP_NOWAIT M_NOWAIT 50#define GFP_ATOMIC (M_NOWAIT | M_USE_RESERVE) 51#define GFP_KERNEL M_WAITOK 52#define GFP_USER M_WAITOK 53#define GFP_HIGHUSER M_WAITOK 54#define GFP_HIGHUSER_MOVABLE M_WAITOK 55#define GFP_IOFS M_NOWAIT 56 57static inline void * 58page_address(struct page *page) 59{ 60 61 if (page->object != kmem_object && page->object != kernel_object) 62 return (NULL); 63 return ((void *)(uintptr_t)(VM_MIN_KERNEL_ADDRESS + 64 IDX_TO_OFF(page->pindex))); 65} 66 67static inline unsigned long 68_get_page(gfp_t mask) 69{ 70 71 return kmem_malloc(kmem_arena, PAGE_SIZE, mask); 72} 73 74#define get_zeroed_page(mask) _get_page((mask) | M_ZERO) 75#define alloc_page(mask) virt_to_page(_get_page((mask))) 76#define __get_free_page(mask) _get_page((mask)) 77 78static inline void 79free_page(unsigned long page) 80{ 81 82 if (page == 0) 83 return; 84 kmem_free(kmem_arena, page, PAGE_SIZE); 85} 86 87static inline void 88__free_page(struct page *m) 89{ 90 91 if (m->object != kmem_object) 92 panic("__free_page: Freed page %p not allocated via wrappers.", 93 m); 94 kmem_free(kmem_arena, (vm_offset_t)page_address(m), PAGE_SIZE); 95} 96 97static inline void 98__free_pages(struct page *m, unsigned int order) 99{ 100 size_t size; 101 102 if (m == NULL) 103 return; 104 size = PAGE_SIZE << order; 105 kmem_free(kmem_arena, (vm_offset_t)page_address(m), size); 106} 107 108static inline void free_pages(uintptr_t addr, unsigned int order) 109{ 110 if (addr == 0) 111 return; 112 __free_pages(virt_to_page((void *)addr), order); 113} 114 115/* 116 * Alloc pages allocates directly from the buddy allocator on linux so 117 * order specifies a power of two bucket of pages and the results 118 * are expected to be aligned on the size as well. 119 */ 120static inline struct page * 121alloc_pages(gfp_t gfp_mask, unsigned int order) 122{ 123 unsigned long page; 124 size_t size; 125 126 size = PAGE_SIZE << order; 127 page = kmem_alloc_contig(kmem_arena, size, gfp_mask, 0, -1, 128 size, 0, VM_MEMATTR_DEFAULT); 129 if (page == 0) 130 return (NULL); 131 return (virt_to_page(page)); 132} 133 134static inline uintptr_t __get_free_pages(gfp_t gfp_mask, unsigned int order) 135{ 136 struct page *page; 137 138 page = alloc_pages(gfp_mask, order); 139 if (page == NULL) 140 return (0); 141 return ((uintptr_t)page_address(page)); 142} 143 144#define alloc_pages_node(node, mask, order) alloc_pages(mask, order) 145 146#define kmalloc_node(chunk, mask, node) kmalloc(chunk, mask) 147 148#endif /* _LINUX_GFP_H_ */ 149