Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | #ifndef __LINUX_GFP_H |
| 2 | #define __LINUX_GFP_H |
| 3 | |
| 4 | #include <linux/mmzone.h> |
| 5 | #include <linux/stddef.h> |
| 6 | #include <linux/linkage.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 7 | |
| 8 | struct vm_area_struct; |
| 9 | |
| 10 | /* |
| 11 | * GFP bitmasks.. |
Christoph Lameter | e53ef38 | 2006-09-25 23:31:14 -0700 | [diff] [blame] | 12 | * |
| 13 | * Zone modifiers (see linux/mmzone.h - low three bits) |
| 14 | * |
Christoph Lameter | e53ef38 | 2006-09-25 23:31:14 -0700 | [diff] [blame] | 15 | * Do not put any conditional on these. If necessary modify the definitions |
| 16 | * without the underscores and use the consistently. The definitions here may |
| 17 | * be used in bit comparisons. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 18 | */ |
Al Viro | af4ca45 | 2005-10-21 02:55:38 -0400 | [diff] [blame] | 19 | #define __GFP_DMA ((__force gfp_t)0x01u) |
| 20 | #define __GFP_HIGHMEM ((__force gfp_t)0x02u) |
Christoph Lameter | e53ef38 | 2006-09-25 23:31:14 -0700 | [diff] [blame] | 21 | #define __GFP_DMA32 ((__force gfp_t)0x04u) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 22 | |
| 23 | /* |
| 24 | * Action modifiers - doesn't change the zoning |
| 25 | * |
| 26 | * __GFP_REPEAT: Try hard to allocate the memory, but the allocation attempt |
| 27 | * _might_ fail. This depends upon the particular VM implementation. |
| 28 | * |
| 29 | * __GFP_NOFAIL: The VM implementation _must_ retry infinitely: the caller |
| 30 | * cannot handle allocation failures. |
| 31 | * |
| 32 | * __GFP_NORETRY: The VM implementation must not retry indefinitely. |
| 33 | */ |
Al Viro | af4ca45 | 2005-10-21 02:55:38 -0400 | [diff] [blame] | 34 | #define __GFP_WAIT ((__force gfp_t)0x10u) /* Can wait and reschedule? */ |
| 35 | #define __GFP_HIGH ((__force gfp_t)0x20u) /* Should access emergency pools? */ |
| 36 | #define __GFP_IO ((__force gfp_t)0x40u) /* Can start physical IO? */ |
| 37 | #define __GFP_FS ((__force gfp_t)0x80u) /* Can call down to low-level FS? */ |
| 38 | #define __GFP_COLD ((__force gfp_t)0x100u) /* Cache-cold page required */ |
| 39 | #define __GFP_NOWARN ((__force gfp_t)0x200u) /* Suppress page allocation failure warning */ |
| 40 | #define __GFP_REPEAT ((__force gfp_t)0x400u) /* Retry the allocation. Might fail */ |
| 41 | #define __GFP_NOFAIL ((__force gfp_t)0x800u) /* Retry for ever. Cannot fail */ |
| 42 | #define __GFP_NORETRY ((__force gfp_t)0x1000u)/* Do not retry. Might fail */ |
| 43 | #define __GFP_NO_GROW ((__force gfp_t)0x2000u)/* Slab internal usage */ |
| 44 | #define __GFP_COMP ((__force gfp_t)0x4000u)/* Add compound page metadata */ |
| 45 | #define __GFP_ZERO ((__force gfp_t)0x8000u)/* Return zeroed page on success */ |
| 46 | #define __GFP_NOMEMALLOC ((__force gfp_t)0x10000u) /* Don't use emergency reserves */ |
Paul Jackson | 2d6c666 | 2005-11-13 16:06:44 -0800 | [diff] [blame] | 47 | #define __GFP_HARDWALL ((__force gfp_t)0x20000u) /* Enforce hardwall cpuset memory allocs */ |
Christoph Lameter | 9b819d2 | 2006-09-25 23:31:40 -0700 | [diff] [blame] | 48 | #define __GFP_THISNODE ((__force gfp_t)0x40000u)/* No fallback, no policies */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 49 | |
Nick Piggin | b84a35b | 2005-05-01 08:58:36 -0700 | [diff] [blame] | 50 | #define __GFP_BITS_SHIFT 20 /* Room for 20 __GFP_FOO bits */ |
Al Viro | af4ca45 | 2005-10-21 02:55:38 -0400 | [diff] [blame] | 51 | #define __GFP_BITS_MASK ((__force gfp_t)((1 << __GFP_BITS_SHIFT) - 1)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 52 | |
| 53 | /* if you forget to add the bitmask here kernel will crash, period */ |
| 54 | #define GFP_LEVEL_MASK (__GFP_WAIT|__GFP_HIGH|__GFP_IO|__GFP_FS| \ |
| 55 | __GFP_COLD|__GFP_NOWARN|__GFP_REPEAT| \ |
Nick Piggin | b84a35b | 2005-05-01 08:58:36 -0700 | [diff] [blame] | 56 | __GFP_NOFAIL|__GFP_NORETRY|__GFP_NO_GROW|__GFP_COMP| \ |
Christoph Lameter | 9b819d2 | 2006-09-25 23:31:40 -0700 | [diff] [blame] | 57 | __GFP_NOMEMALLOC|__GFP_HARDWALL|__GFP_THISNODE) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 58 | |
Jeff Dike | 7b04d71 | 2006-04-10 22:53:27 -0700 | [diff] [blame] | 59 | /* This equals 0, but use constants in case they ever change */ |
| 60 | #define GFP_NOWAIT (GFP_ATOMIC & ~__GFP_HIGH) |
Paul Jackson | 4eac915 | 2006-01-11 12:17:19 -0800 | [diff] [blame] | 61 | /* GFP_ATOMIC means both !wait (__GFP_WAIT not set) and use emergency pool */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 62 | #define GFP_ATOMIC (__GFP_HIGH) |
| 63 | #define GFP_NOIO (__GFP_WAIT) |
| 64 | #define GFP_NOFS (__GFP_WAIT | __GFP_IO) |
| 65 | #define GFP_KERNEL (__GFP_WAIT | __GFP_IO | __GFP_FS) |
Paul Jackson | f90b1d2 | 2005-09-06 15:18:10 -0700 | [diff] [blame] | 66 | #define GFP_USER (__GFP_WAIT | __GFP_IO | __GFP_FS | __GFP_HARDWALL) |
| 67 | #define GFP_HIGHUSER (__GFP_WAIT | __GFP_IO | __GFP_FS | __GFP_HARDWALL | \ |
| 68 | __GFP_HIGHMEM) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 69 | |
Christoph Lameter | 77f700d | 2006-09-27 01:50:07 -0700 | [diff] [blame] | 70 | #ifdef CONFIG_NUMA |
Christoph Lameter | 980128f | 2006-09-25 23:31:46 -0700 | [diff] [blame] | 71 | #define GFP_THISNODE (__GFP_THISNODE | __GFP_NOWARN | __GFP_NORETRY) |
Christoph Lameter | 77f700d | 2006-09-27 01:50:07 -0700 | [diff] [blame] | 72 | #else |
Al Viro | f2e97df | 2007-02-09 16:38:55 +0000 | [diff] [blame^] | 73 | #define GFP_THISNODE ((__force gfp_t)0) |
Christoph Lameter | 77f700d | 2006-09-27 01:50:07 -0700 | [diff] [blame] | 74 | #endif |
| 75 | |
Christoph Lameter | 980128f | 2006-09-25 23:31:46 -0700 | [diff] [blame] | 76 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 77 | /* Flag - indicates that the buffer will be suitable for DMA. Ignored on some |
| 78 | platforms, used as appropriate on others */ |
| 79 | |
| 80 | #define GFP_DMA __GFP_DMA |
| 81 | |
Andi Kleen | a2f1b42 | 2005-11-05 17:25:53 +0100 | [diff] [blame] | 82 | /* 4GB DMA on some platforms */ |
| 83 | #define GFP_DMA32 __GFP_DMA32 |
| 84 | |
| 85 | |
Christoph Lameter | 19655d3 | 2006-09-25 23:31:19 -0700 | [diff] [blame] | 86 | static inline enum zone_type gfp_zone(gfp_t flags) |
Christoph Lameter | 4e4785b | 2006-09-25 23:31:17 -0700 | [diff] [blame] | 87 | { |
| 88 | if (flags & __GFP_DMA) |
| 89 | return ZONE_DMA; |
| 90 | #ifdef CONFIG_ZONE_DMA32 |
| 91 | if (flags & __GFP_DMA32) |
| 92 | return ZONE_DMA32; |
| 93 | #endif |
| 94 | #ifdef CONFIG_HIGHMEM |
| 95 | if (flags & __GFP_HIGHMEM) |
| 96 | return ZONE_HIGHMEM; |
| 97 | #endif |
| 98 | return ZONE_NORMAL; |
| 99 | } |
| 100 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 101 | /* |
| 102 | * There is only one page-allocator function, and two main namespaces to |
| 103 | * it. The alloc_page*() variants return 'struct page *' and as such |
| 104 | * can allocate highmem pages, the *get*page*() variants return |
| 105 | * virtual kernel addresses to the allocated page(s). |
| 106 | */ |
| 107 | |
| 108 | /* |
| 109 | * We get the zone list from the current node and the gfp_mask. |
| 110 | * This zone list contains a maximum of MAXNODES*MAX_NR_ZONES zones. |
| 111 | * |
| 112 | * For the normal case of non-DISCONTIGMEM systems the NODE_DATA() gets |
| 113 | * optimized to &contig_page_data at compile-time. |
| 114 | */ |
| 115 | |
| 116 | #ifndef HAVE_ARCH_FREE_PAGE |
| 117 | static inline void arch_free_page(struct page *page, int order) { } |
| 118 | #endif |
Nick Piggin | cc10250 | 2006-12-06 20:32:00 -0800 | [diff] [blame] | 119 | #ifndef HAVE_ARCH_ALLOC_PAGE |
| 120 | static inline void arch_alloc_page(struct page *page, int order) { } |
| 121 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 122 | |
| 123 | extern struct page * |
Al Viro | dd0fc66 | 2005-10-07 07:46:04 +0100 | [diff] [blame] | 124 | FASTCALL(__alloc_pages(gfp_t, unsigned int, struct zonelist *)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 125 | |
Al Viro | dd0fc66 | 2005-10-07 07:46:04 +0100 | [diff] [blame] | 126 | static inline struct page *alloc_pages_node(int nid, gfp_t gfp_mask, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 127 | unsigned int order) |
| 128 | { |
| 129 | if (unlikely(order >= MAX_ORDER)) |
| 130 | return NULL; |
| 131 | |
Andi Kleen | 819a692 | 2006-01-11 22:43:45 +0100 | [diff] [blame] | 132 | /* Unknown node is current node */ |
| 133 | if (nid < 0) |
| 134 | nid = numa_node_id(); |
| 135 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 136 | return __alloc_pages(gfp_mask, order, |
Al Viro | af4ca45 | 2005-10-21 02:55:38 -0400 | [diff] [blame] | 137 | NODE_DATA(nid)->node_zonelists + gfp_zone(gfp_mask)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 138 | } |
| 139 | |
| 140 | #ifdef CONFIG_NUMA |
Al Viro | dd0fc66 | 2005-10-07 07:46:04 +0100 | [diff] [blame] | 141 | extern struct page *alloc_pages_current(gfp_t gfp_mask, unsigned order); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 142 | |
| 143 | static inline struct page * |
Al Viro | dd0fc66 | 2005-10-07 07:46:04 +0100 | [diff] [blame] | 144 | alloc_pages(gfp_t gfp_mask, unsigned int order) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 145 | { |
| 146 | if (unlikely(order >= MAX_ORDER)) |
| 147 | return NULL; |
| 148 | |
| 149 | return alloc_pages_current(gfp_mask, order); |
| 150 | } |
Al Viro | dd0fc66 | 2005-10-07 07:46:04 +0100 | [diff] [blame] | 151 | extern struct page *alloc_page_vma(gfp_t gfp_mask, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 152 | struct vm_area_struct *vma, unsigned long addr); |
| 153 | #else |
| 154 | #define alloc_pages(gfp_mask, order) \ |
| 155 | alloc_pages_node(numa_node_id(), gfp_mask, order) |
| 156 | #define alloc_page_vma(gfp_mask, vma, addr) alloc_pages(gfp_mask, 0) |
| 157 | #endif |
| 158 | #define alloc_page(gfp_mask) alloc_pages(gfp_mask, 0) |
| 159 | |
Al Viro | dd0fc66 | 2005-10-07 07:46:04 +0100 | [diff] [blame] | 160 | extern unsigned long FASTCALL(__get_free_pages(gfp_t gfp_mask, unsigned int order)); |
| 161 | extern unsigned long FASTCALL(get_zeroed_page(gfp_t gfp_mask)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 162 | |
| 163 | #define __get_free_page(gfp_mask) \ |
| 164 | __get_free_pages((gfp_mask),0) |
| 165 | |
| 166 | #define __get_dma_pages(gfp_mask, order) \ |
| 167 | __get_free_pages((gfp_mask) | GFP_DMA,(order)) |
| 168 | |
| 169 | extern void FASTCALL(__free_pages(struct page *page, unsigned int order)); |
| 170 | extern void FASTCALL(free_pages(unsigned long addr, unsigned int order)); |
| 171 | extern void FASTCALL(free_hot_page(struct page *page)); |
| 172 | extern void FASTCALL(free_cold_page(struct page *page)); |
| 173 | |
| 174 | #define __free_page(page) __free_pages((page), 0) |
| 175 | #define free_page(addr) free_pages((addr),0) |
| 176 | |
| 177 | void page_alloc_init(void); |
Christoph Lameter | 4ae7c03 | 2005-06-21 17:14:57 -0700 | [diff] [blame] | 178 | #ifdef CONFIG_NUMA |
Christoph Lameter | 8fce4d8 | 2006-03-09 17:33:54 -0800 | [diff] [blame] | 179 | void drain_node_pages(int node); |
Christoph Lameter | 4ae7c03 | 2005-06-21 17:14:57 -0700 | [diff] [blame] | 180 | #else |
Christoph Lameter | 8fce4d8 | 2006-03-09 17:33:54 -0800 | [diff] [blame] | 181 | static inline void drain_node_pages(int node) { }; |
Christoph Lameter | 4ae7c03 | 2005-06-21 17:14:57 -0700 | [diff] [blame] | 182 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 183 | |
| 184 | #endif /* __LINUX_GFP_H */ |