sys/dev/drm/include/linux/mm.h

   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, 2014 Mellanox Technologies, Ltd.
   6  * Copyright (c) 2015 François Tigeot
   7  * Copyright (c) 2015 Matthew Dillon <dillon@backplane.com>
   8  * All rights reserved.
   9  *
  10  * Redistribution and use in source and binary forms, with or without
  11  * modification, are permitted provided that the following conditions
  12  * are met:
  13  * 1. Redistributions of source code must retain the above copyright
  14  *    notice unmodified, this list of conditions, and the following
  15  *    disclaimer.
  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.
  19  *
  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.
  30  */
  31 #ifndef _LINUX_MM_H_
  32 #define _LINUX_MM_H_
  33
  34 #include <linux/errno.h>
  35 #include <linux/kernel.h>
  36
  37 #include <asm/page.h>
  38 #include <asm/pgtable.h>
  39
  40 #define PAGE_ALIGN(addr) round_page(addr)
  41
  42 struct vm_area_struct {
  43         vm_offset_t     vm_start;
  44         vm_offset_t     vm_end;
  45         vm_offset_t     vm_pgoff;
  46         vm_paddr_t      vm_pfn;         /* PFN For mmap. */
  47         vm_memattr_t    vm_page_prot;
  48 };
  49
  50 /*
  51  * Compute log2 of the power of two rounded up count of pages
  52  * needed for size bytes.
  53  */
  54 static inline int
  55 get_order(unsigned long size)
  56 {
  57         int order;
  58
  59         size = (size - 1) >> PAGE_SHIFT;
  60         order = 0;
  61         while (size) {
  62                 order++;
  63                 size >>= 1;
  64         }
  65         return (order);
  66 }
  67
  68 /*
  69  * This only works via mmap ops.
  70  */
  71 static inline int
  72 io_remap_pfn_range(struct vm_area_struct *vma,
  73     unsigned long addr, unsigned long pfn, unsigned long size,
  74     vm_memattr_t prot)
  75 {
  76         vma->vm_page_prot = prot;
  77         vma->vm_pfn = pfn;
  78
  79         return (0);
  80 }
  81
  82 static inline unsigned long
  83 vma_pages(struct vm_area_struct *vma)
  84 {
  85         unsigned long size;
  86
  87         size = vma->vm_end - vma->vm_start;
  88
  89         return size >> PAGE_SHIFT;
  90 }
  91
  92 #define offset_in_page(off)     ((off) & PAGE_MASK)
  93
  94 static inline void
  95 set_page_dirty(struct vm_page *page)
  96 {
  97         vm_page_dirty(page);
  98 }
  99
 100 /*
 101  * Allocate multiple contiguous pages.  The DragonFly code can only do
 102  * multiple allocations via the free page reserve.  Linux does not appear
 103  * to restrict the address space, so neither do we.
 104  */
 105 static inline struct vm_page *
 106 alloc_pages(int flags, u_int order)
 107 {
 108         size_t bytes = PAGE_SIZE << order;
 109         struct vm_page *pgs;
 110
 111         pgs = vm_page_alloc_contig(0LLU, ~0LLU, bytes, bytes, bytes,
 112                                    VM_MEMATTR_DEFAULT);
 113         kprintf("alloc_pages order %u vm_pages=%p\n", order, pgs);
 114         return pgs;
 115 }
 116
 117 /*
 118  * Free multiple contiguous pages
 119  */
 120 static inline void
 121 __free_pages(struct vm_page *pgs, u_int order)
 122 {
 123         size_t bytes = PAGE_SIZE << order;
 124
 125         vm_page_free_contig(pgs, bytes);
 126 }
 127
 128 #endif  /* _LINUX_MM_H_ */