2 * Copyright (c) 2010 Isilon Systems, Inc.
3 * Copyright (c) 2010 iX Systems, Inc.
4 * Copyright (c) 2010 Panasas, Inc.
5 * Copyright (c) 2013, 2014 Mellanox Technologies, Ltd.
6 * Copyright (c) 2015 Matthew Dillon <dillon@backplane.com>
7 * Copyright (c) 2015-2019 François Tigeot <ftigeot@wolfpond.org>
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
13 * 1. Redistributions of source code must retain the above copyright
14 * notice unmodified, this list of conditions, and the following
16 * 2. Redistributions in binary form must reproduce the above copyright
17 * notice, this list of conditions and the following disclaimer in the
18 * documentation and/or other materials provided with the distribution.
20 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
21 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
22 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
23 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
24 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
25 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
26 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
27 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
28 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
29 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
34 #include <linux/errno.h>
36 #include <linux/mmdebug.h>
37 #include <linux/gfp.h>
38 #include <linux/bug.h>
39 #include <linux/list.h>
40 #include <linux/mmzone.h>
41 #include <linux/rbtree.h>
42 #include <linux/atomic.h>
43 #include <linux/mm_types.h>
44 #include <linux/err.h>
45 #include <linux/shrinker.h>
48 #include <asm/pgtable.h>
49 #include <asm/processor.h>
51 struct vm_operations_struct;
53 static inline struct page *
54 nth_page(struct page *page, int n)
59 #define PAGE_ALIGN(addr) round_page(addr)
62 uintptr_t virtual_address;
65 #define VM_FAULT_NOPAGE 0x0001
66 #define VM_FAULT_SIGBUS 0x0002
67 #define VM_FAULT_OOM 0x0004
69 struct vm_area_struct {
73 vm_paddr_t vm_pfn; /* PFN For mmap. */
74 vm_memattr_t vm_page_prot;
75 void *vm_private_data;
77 const struct vm_operations_struct *vm_ops;
80 #define VM_DONTDUMP 0x0001
81 #define VM_DONTEXPAND 0x0002
83 #define VM_MIXEDMAP 0x0008
85 struct vm_operations_struct {
86 int (*fault)(struct vm_area_struct *vma, struct vm_fault *vmf);
87 void (*open)(struct vm_area_struct *vma);
88 void (*close)(struct vm_area_struct *vma);
92 * Compute log2 of the power of two rounded up count of pages
93 * needed for size bytes.
96 get_order(unsigned long size)
100 size = (size - 1) >> PAGE_SHIFT;
110 * This only works via mmap ops.
113 io_remap_pfn_range(struct vm_area_struct *vma,
114 unsigned long addr, unsigned long pfn, unsigned long size,
117 vma->vm_page_prot = prot;
123 static inline unsigned long
124 vma_pages(struct vm_area_struct *vma)
128 size = vma->vm_end - vma->vm_start;
130 return size >> PAGE_SHIFT;
133 #define offset_in_page(off) ((off) & PAGE_MASK)
136 set_page_dirty(struct page *page)
138 vm_page_dirty((struct vm_page *)page);
142 * Allocate multiple contiguous pages. The DragonFly code can only do
143 * multiple allocations via the free page reserve. Linux does not appear
144 * to restrict the address space, so neither do we.
146 static inline struct vm_page *
147 alloc_pages(int flags, u_int order)
149 size_t bytes = PAGE_SIZE << order;
152 pgs = vm_page_alloc_contig(0LLU, ~0LLU, bytes, bytes, bytes,
154 kprintf("alloc_pages order %u vm_pages=%p\n", order, pgs);
159 * Free multiple contiguous pages
162 __free_pages(struct vm_page *pgs, u_int order)
164 size_t bytes = PAGE_SIZE << order;
166 vm_page_free_contig(pgs, bytes);
170 get_page(struct vm_page *page)
175 extern vm_paddr_t Realmem;
177 static inline unsigned long get_num_physpages(void)
179 return Realmem / PAGE_SIZE;
182 int is_vmalloc_addr(const void *x);
185 unmap_mapping_range(struct address_space *mapping,
186 loff_t const holebegin, loff_t const holelen, int even_cows)
190 #define VM_SHARED 0x00000008
192 #define VM_PFNMAP 0x00000400
194 #endif /* _LINUX_MM_H_ */