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

   1 /*
   2  * Copyright (c) 2015-2020 François Tigeot <ftigeot@wolfpond.org>
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice unmodified, this list of conditions, and the following
  10  *    disclaimer.
  11  * 2. Redistributions in binary form must reproduce the above copyright
  12  *    notice, this list of conditions and the following disclaimer in the
  13  *    documentation and/or other materials provided with the distribution.
  14  *
  15  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  16  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  17  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  18  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  19  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  20  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  21  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  22  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  23  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  24  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  25  */
  26
  27 #ifndef _LINUX_GFP_H_
  28 #define _LINUX_GFP_H_
  29
  30 #include <linux/mmdebug.h>
  31 #include <linux/mmzone.h>
  32 #include <linux/stddef.h>
  33
  34 #include <sys/malloc.h>
  35 #include <vm/vm_page.h>
  36 #include <machine/bus_dma.h>
  37
  38 #define GFP_NOWAIT      (M_NOWAIT | M_CACHEALIGN)
  39 #define GFP_ATOMIC      (M_NOWAIT | M_CACHEALIGN)
  40 #define GFP_KERNEL      (M_WAITOK | M_CACHEALIGN)
  41 #define GFP_TEMPORARY   GFP_KERNEL
  42 #define GFP_USER        GFP_KERNEL
  43 #define GFP_HIGHUSER    GFP_KERNEL
  44
  45 #define __GFP_ZERO              M_ZERO
  46 #define __GFP_NORETRY           M_NULLOK
  47 #define __GFP_RETRY_MAYFAIL     M_NULLOK
  48
  49 #define __GFP_HIGHMEM           0u      /* No particular meaning on DragonFly */
  50 #define __GFP_IO                0u      /* No particular meaning on DragonFly */
  51 #define __GFP_RECLAIM           0u
  52 #define __GFP_RECLAIMABLE       0u
  53 #define __GFP_NOWARN            0u
  54 #define __GFP_NOFAIL            0u
  55
  56 #define __GFP_DMA32     0x10000u        /* XXX: MUST NOT collide with the M_XXX definitions */
  57 #define GFP_DMA32       __GFP_DMA32
  58
  59 static inline void __free_page(struct page *page)
  60 {
  61         vm_page_free_contig((struct vm_page *)page, PAGE_SIZE);
  62 }
  63
  64 static inline struct page * alloc_page(int flags)
  65 {
  66         vm_paddr_t high = ~0LLU;
  67
  68         if (flags & GFP_DMA32)
  69                 high = BUS_SPACE_MAXADDR_32BIT;
  70
  71         return (struct page *)vm_page_alloc_contig(0LLU, ~0LLU,
  72                         PAGE_SIZE, PAGE_SIZE, PAGE_SIZE,
  73                         VM_MEMATTR_DEFAULT);
  74 }
  75
  76 static inline bool
  77 gfpflags_allow_blocking(const gfp_t flags)
  78 {
  79         return (flags & M_WAITOK);
  80 }
  81
  82 /*
  83  * Allocate multiple contiguous pages. The DragonFly code can only do
  84  * multiple allocations via the free page reserve.  Linux does not appear
  85  * to restrict the address space, so neither do we.
  86  */
  87 static inline struct page *
  88 alloc_pages(gfp_t gfp_mask, unsigned int order)
  89 {
  90         size_t bytes = PAGE_SIZE << order;
  91         struct vm_page *pgs;
  92
  93         pgs = vm_page_alloc_contig(0LLU, ~0LLU, bytes, bytes, bytes,
  94                                    VM_MEMATTR_DEFAULT);
  95
  96         return (struct page*)pgs;
  97 }
  98
  99 /*
 100  * Free multiple contiguous pages
 101  */
 102 static inline void
 103 __free_pages(struct page *pgs, unsigned int order)
 104 {
 105         size_t bytes = PAGE_SIZE << order;
 106
 107         vm_page_free_contig((struct vm_page *)pgs, bytes);
 108 }
 109
 110 #endif  /* _LINUX_GFP_H_ */