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> |
| 7 | #include <linux/config.h> |
| 8 | |
| 9 | struct vm_area_struct; |
| 10 | |
| 11 | /* |
| 12 | * GFP bitmasks.. |
| 13 | */ |
Linus Torvalds | ac3461a | 2005-11-22 19:39:30 -0800 | [diff] [blame] | 14 | /* Zone modifiers in GFP_ZONEMASK (see linux/mmzone.h - low three bits) */ |
Al Viro | af4ca45 | 2005-10-21 02:55:38 -0400 | [diff] [blame] | 15 | #define __GFP_DMA ((__force gfp_t)0x01u) |
| 16 | #define __GFP_HIGHMEM ((__force gfp_t)0x02u) |
Andi Kleen | a2f1b42 | 2005-11-05 17:25:53 +0100 | [diff] [blame] | 17 | #ifdef CONFIG_DMA_IS_DMA32 |
| 18 | #define __GFP_DMA32 ((__force gfp_t)0x01) /* ZONE_DMA is ZONE_DMA32 */ |
| 19 | #elif BITS_PER_LONG < 64 |
| 20 | #define __GFP_DMA32 ((__force gfp_t)0x00) /* ZONE_NORMAL is ZONE_DMA32 */ |
| 21 | #else |
| 22 | #define __GFP_DMA32 ((__force gfp_t)0x04) /* Has own ZONE_DMA32 */ |
| 23 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 24 | |
| 25 | /* |
| 26 | * Action modifiers - doesn't change the zoning |
| 27 | * |
| 28 | * __GFP_REPEAT: Try hard to allocate the memory, but the allocation attempt |
| 29 | * _might_ fail. This depends upon the particular VM implementation. |
| 30 | * |
| 31 | * __GFP_NOFAIL: The VM implementation _must_ retry infinitely: the caller |
| 32 | * cannot handle allocation failures. |
| 33 | * |
| 34 | * __GFP_NORETRY: The VM implementation must not retry indefinitely. |
| 35 | */ |
Al Viro | af4ca45 | 2005-10-21 02:55:38 -0400 | [diff] [blame] | 36 | #define __GFP_WAIT ((__force gfp_t)0x10u) /* Can wait and reschedule? */ |
| 37 | #define __GFP_HIGH ((__force gfp_t)0x20u) /* Should access emergency pools? */ |
| 38 | #define __GFP_IO ((__force gfp_t)0x40u) /* Can start physical IO? */ |
| 39 | #define __GFP_FS ((__force gfp_t)0x80u) /* Can call down to low-level FS? */ |
| 40 | #define __GFP_COLD ((__force gfp_t)0x100u) /* Cache-cold page required */ |
| 41 | #define __GFP_NOWARN ((__force gfp_t)0x200u) /* Suppress page allocation failure warning */ |
| 42 | #define __GFP_REPEAT ((__force gfp_t)0x400u) /* Retry the allocation. Might fail */ |
| 43 | #define __GFP_NOFAIL ((__force gfp_t)0x800u) /* Retry for ever. Cannot fail */ |
| 44 | #define __GFP_NORETRY ((__force gfp_t)0x1000u)/* Do not retry. Might fail */ |
| 45 | #define __GFP_NO_GROW ((__force gfp_t)0x2000u)/* Slab internal usage */ |
| 46 | #define __GFP_COMP ((__force gfp_t)0x4000u)/* Add compound page metadata */ |
| 47 | #define __GFP_ZERO ((__force gfp_t)0x8000u)/* Return zeroed page on success */ |
| 48 | #define __GFP_NOMEMALLOC ((__force gfp_t)0x10000u) /* Don't use emergency reserves */ |
Paul Jackson | 2d6c666 | 2005-11-13 16:06:44 -0800 | [diff] [blame] | 49 | #define __GFP_HARDWALL ((__force gfp_t)0x20000u) /* Enforce hardwall cpuset memory allocs */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 50 | |
Nick Piggin | b84a35b | 2005-05-01 08:58:36 -0700 | [diff] [blame] | 51 | #define __GFP_BITS_SHIFT 20 /* Room for 20 __GFP_FOO bits */ |
Al Viro | af4ca45 | 2005-10-21 02:55:38 -0400 | [diff] [blame] | 52 | #define __GFP_BITS_MASK ((__force gfp_t)((1 << __GFP_BITS_SHIFT) - 1)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 53 | |
| 54 | /* if you forget to add the bitmask here kernel will crash, period */ |
| 55 | #define GFP_LEVEL_MASK (__GFP_WAIT|__GFP_HIGH|__GFP_IO|__GFP_FS| \ |
| 56 | __GFP_COLD|__GFP_NOWARN|__GFP_REPEAT| \ |
Nick Piggin | b84a35b | 2005-05-01 08:58:36 -0700 | [diff] [blame] | 57 | __GFP_NOFAIL|__GFP_NORETRY|__GFP_NO_GROW|__GFP_COMP| \ |
Paul Jackson | 2d6c666 | 2005-11-13 16:06:44 -0800 | [diff] [blame] | 58 | __GFP_NOMEMALLOC|__GFP_HARDWALL) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 59 | |
| 60 | #define GFP_ATOMIC (__GFP_HIGH) |
| 61 | #define GFP_NOIO (__GFP_WAIT) |
| 62 | #define GFP_NOFS (__GFP_WAIT | __GFP_IO) |
| 63 | #define GFP_KERNEL (__GFP_WAIT | __GFP_IO | __GFP_FS) |
Paul Jackson | f90b1d2 | 2005-09-06 15:18:10 -0700 | [diff] [blame] | 64 | #define GFP_USER (__GFP_WAIT | __GFP_IO | __GFP_FS | __GFP_HARDWALL) |
| 65 | #define GFP_HIGHUSER (__GFP_WAIT | __GFP_IO | __GFP_FS | __GFP_HARDWALL | \ |
| 66 | __GFP_HIGHMEM) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 67 | |
| 68 | /* Flag - indicates that the buffer will be suitable for DMA. Ignored on some |
| 69 | platforms, used as appropriate on others */ |
| 70 | |
| 71 | #define GFP_DMA __GFP_DMA |
| 72 | |
Andi Kleen | a2f1b42 | 2005-11-05 17:25:53 +0100 | [diff] [blame] | 73 | /* 4GB DMA on some platforms */ |
| 74 | #define GFP_DMA32 __GFP_DMA32 |
| 75 | |
| 76 | |
Linus Torvalds | ac3461a | 2005-11-22 19:39:30 -0800 | [diff] [blame] | 77 | static inline int gfp_zone(gfp_t gfp) |
| 78 | { |
| 79 | int zone = GFP_ZONEMASK & (__force int) gfp; |
| 80 | BUG_ON(zone >= GFP_ZONETYPES); |
| 81 | return zone; |
| 82 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 83 | |
| 84 | /* |
| 85 | * There is only one page-allocator function, and two main namespaces to |
| 86 | * it. The alloc_page*() variants return 'struct page *' and as such |
| 87 | * can allocate highmem pages, the *get*page*() variants return |
| 88 | * virtual kernel addresses to the allocated page(s). |
| 89 | */ |
| 90 | |
| 91 | /* |
| 92 | * We get the zone list from the current node and the gfp_mask. |
| 93 | * This zone list contains a maximum of MAXNODES*MAX_NR_ZONES zones. |
| 94 | * |
| 95 | * For the normal case of non-DISCONTIGMEM systems the NODE_DATA() gets |
| 96 | * optimized to &contig_page_data at compile-time. |
| 97 | */ |
| 98 | |
| 99 | #ifndef HAVE_ARCH_FREE_PAGE |
| 100 | static inline void arch_free_page(struct page *page, int order) { } |
| 101 | #endif |
| 102 | |
| 103 | extern struct page * |
Al Viro | dd0fc66 | 2005-10-07 07:46:04 +0100 | [diff] [blame] | 104 | FASTCALL(__alloc_pages(gfp_t, unsigned int, struct zonelist *)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 105 | |
Al Viro | dd0fc66 | 2005-10-07 07:46:04 +0100 | [diff] [blame] | 106 | 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] | 107 | unsigned int order) |
| 108 | { |
| 109 | if (unlikely(order >= MAX_ORDER)) |
| 110 | return NULL; |
| 111 | |
| 112 | return __alloc_pages(gfp_mask, order, |
Al Viro | af4ca45 | 2005-10-21 02:55:38 -0400 | [diff] [blame] | 113 | NODE_DATA(nid)->node_zonelists + gfp_zone(gfp_mask)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 114 | } |
| 115 | |
| 116 | #ifdef CONFIG_NUMA |
Al Viro | dd0fc66 | 2005-10-07 07:46:04 +0100 | [diff] [blame] | 117 | extern struct page *alloc_pages_current(gfp_t gfp_mask, unsigned order); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 118 | |
| 119 | static inline struct page * |
Al Viro | dd0fc66 | 2005-10-07 07:46:04 +0100 | [diff] [blame] | 120 | alloc_pages(gfp_t gfp_mask, unsigned int order) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 121 | { |
| 122 | if (unlikely(order >= MAX_ORDER)) |
| 123 | return NULL; |
| 124 | |
| 125 | return alloc_pages_current(gfp_mask, order); |
| 126 | } |
Al Viro | dd0fc66 | 2005-10-07 07:46:04 +0100 | [diff] [blame] | 127 | extern struct page *alloc_page_vma(gfp_t gfp_mask, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 128 | struct vm_area_struct *vma, unsigned long addr); |
| 129 | #else |
| 130 | #define alloc_pages(gfp_mask, order) \ |
| 131 | alloc_pages_node(numa_node_id(), gfp_mask, order) |
| 132 | #define alloc_page_vma(gfp_mask, vma, addr) alloc_pages(gfp_mask, 0) |
| 133 | #endif |
| 134 | #define alloc_page(gfp_mask) alloc_pages(gfp_mask, 0) |
| 135 | |
Al Viro | dd0fc66 | 2005-10-07 07:46:04 +0100 | [diff] [blame] | 136 | extern unsigned long FASTCALL(__get_free_pages(gfp_t gfp_mask, unsigned int order)); |
| 137 | extern unsigned long FASTCALL(get_zeroed_page(gfp_t gfp_mask)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 138 | |
| 139 | #define __get_free_page(gfp_mask) \ |
| 140 | __get_free_pages((gfp_mask),0) |
| 141 | |
| 142 | #define __get_dma_pages(gfp_mask, order) \ |
| 143 | __get_free_pages((gfp_mask) | GFP_DMA,(order)) |
| 144 | |
| 145 | extern void FASTCALL(__free_pages(struct page *page, unsigned int order)); |
| 146 | extern void FASTCALL(free_pages(unsigned long addr, unsigned int order)); |
| 147 | extern void FASTCALL(free_hot_page(struct page *page)); |
| 148 | extern void FASTCALL(free_cold_page(struct page *page)); |
| 149 | |
| 150 | #define __free_page(page) __free_pages((page), 0) |
| 151 | #define free_page(addr) free_pages((addr),0) |
| 152 | |
| 153 | void page_alloc_init(void); |
Christoph Lameter | 4ae7c03 | 2005-06-21 17:14:57 -0700 | [diff] [blame] | 154 | #ifdef CONFIG_NUMA |
| 155 | void drain_remote_pages(void); |
| 156 | #else |
| 157 | static inline void drain_remote_pages(void) { }; |
| 158 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 159 | |
| 160 | #endif /* __LINUX_GFP_H */ |