gfp.h revision 293419
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 * $FreeBSD: head/sys/compat/linuxkpi/common/include/linux/gfp.h 293419 2016-01-08 10:04:19Z hselasky $ 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 50#define GFP_NOWAIT M_NOWAIT 51#define GFP_ATOMIC (M_NOWAIT | M_USE_RESERVE) 52#define GFP_KERNEL M_WAITOK 53#define GFP_USER M_WAITOK 54#define GFP_HIGHUSER M_WAITOK 55#define GFP_HIGHUSER_MOVABLE M_WAITOK 56#define GFP_IOFS M_NOWAIT 57 58static inline void * 59page_address(struct page *page) 60{ 61 62 if (page->object != kmem_object && page->object != kernel_object) 63 return (NULL); 64 return ((void *)(uintptr_t)(VM_MIN_KERNEL_ADDRESS + 65 IDX_TO_OFF(page->pindex))); 66} 67 68static inline unsigned long 69linux_get_page(gfp_t mask) 70{ 71 72 return kmem_malloc(kmem_arena, PAGE_SIZE, mask); 73} 74 75#define get_zeroed_page(mask) linux_get_page((mask) | M_ZERO) 76#define alloc_page(mask) virt_to_page(linux_get_page((mask))) 77#define __get_free_page(mask) linux_get_page((mask)) 78 79static inline void 80free_page(unsigned long page) 81{ 82 83 if (page == 0) 84 return; 85 kmem_free(kmem_arena, page, PAGE_SIZE); 86} 87 88static inline void 89__free_page(struct page *m) 90{ 91 92 if (m->object != kmem_object) 93 panic("__free_page: Freed page %p not allocated via wrappers.", 94 m); 95 kmem_free(kmem_arena, (vm_offset_t)page_address(m), PAGE_SIZE); 96} 97 98static inline void 99__free_pages(struct page *m, unsigned int order) 100{ 101 size_t size; 102 103 if (m == NULL) 104 return; 105 size = PAGE_SIZE << order; 106 kmem_free(kmem_arena, (vm_offset_t)page_address(m), size); 107} 108 109static inline void free_pages(uintptr_t addr, unsigned int order) 110{ 111 if (addr == 0) 112 return; 113 __free_pages(virt_to_page((void *)addr), order); 114} 115 116/* 117 * Alloc pages allocates directly from the buddy allocator on linux so 118 * order specifies a power of two bucket of pages and the results 119 * are expected to be aligned on the size as well. 120 */ 121static inline struct page * 122alloc_pages(gfp_t gfp_mask, unsigned int order) 123{ 124 unsigned long page; 125 size_t size; 126 127 size = PAGE_SIZE << order; 128 page = kmem_alloc_contig(kmem_arena, size, gfp_mask, 0, -1, 129 size, 0, VM_MEMATTR_DEFAULT); 130 if (page == 0) 131 return (NULL); 132 return (virt_to_page(page)); 133} 134 135static inline uintptr_t __get_free_pages(gfp_t gfp_mask, unsigned int order) 136{ 137 struct page *page; 138 139 page = alloc_pages(gfp_mask, order); 140 if (page == NULL) 141 return (0); 142 return ((uintptr_t)page_address(page)); 143} 144 145#define alloc_pages_node(node, mask, order) alloc_pages(mask, order) 146 147#define kmalloc_node(chunk, mask, node) kmalloc(chunk, mask) 148 149#endif /* _LINUX_GFP_H_ */ 150