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 */ 14 /* Zone modifiers in GFP_ZONEMASK (see linux/mmzone.h - low three bits) */ 15 #define __GFP_DMA ((__force gfp_t)0x01u) 16 #define __GFP_HIGHMEM ((__force gfp_t)0x02u) 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 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 */ 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 */ 49 #define __GFP_HARDWALL ((__force gfp_t)0x20000u) /* Enforce hardwall cpuset memory allocs */ 50 51 #define __GFP_BITS_SHIFT 20 /* Room for 20 __GFP_FOO bits */ 52 #define __GFP_BITS_MASK ((__force gfp_t)((1 << __GFP_BITS_SHIFT) - 1)) 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| \ 57 __GFP_NOFAIL|__GFP_NORETRY|__GFP_NO_GROW|__GFP_COMP| \ 58 __GFP_NOMEMALLOC|__GFP_HARDWALL) 59 60 /* GFP_ATOMIC means both !wait (__GFP_WAIT not set) and use emergency pool */ 61 #define GFP_ATOMIC (__GFP_HIGH) 62 #define GFP_NOIO (__GFP_WAIT) 63 #define GFP_NOFS (__GFP_WAIT | __GFP_IO) 64 #define GFP_KERNEL (__GFP_WAIT | __GFP_IO | __GFP_FS) 65 #define GFP_USER (__GFP_WAIT | __GFP_IO | __GFP_FS | __GFP_HARDWALL) 66 #define GFP_HIGHUSER (__GFP_WAIT | __GFP_IO | __GFP_FS | __GFP_HARDWALL | \ 67 __GFP_HIGHMEM) 68 69 /* Flag - indicates that the buffer will be suitable for DMA. Ignored on some 70 platforms, used as appropriate on others */ 71 72 #define GFP_DMA __GFP_DMA 73 74 /* 4GB DMA on some platforms */ 75 #define GFP_DMA32 __GFP_DMA32 76 77 78 static inline int gfp_zone(gfp_t gfp) 79 { 80 int zone = GFP_ZONEMASK & (__force int) gfp; 81 BUG_ON(zone >= GFP_ZONETYPES); 82 return zone; 83 } 84 85 /* 86 * There is only one page-allocator function, and two main namespaces to 87 * it. The alloc_page*() variants return 'struct page *' and as such 88 * can allocate highmem pages, the *get*page*() variants return 89 * virtual kernel addresses to the allocated page(s). 90 */ 91 92 /* 93 * We get the zone list from the current node and the gfp_mask. 94 * This zone list contains a maximum of MAXNODES*MAX_NR_ZONES zones. 95 * 96 * For the normal case of non-DISCONTIGMEM systems the NODE_DATA() gets 97 * optimized to &contig_page_data at compile-time. 98 */ 99 100 #ifndef HAVE_ARCH_FREE_PAGE 101 static inline void arch_free_page(struct page *page, int order) { } 102 #endif 103 104 extern struct page * 105 FASTCALL(__alloc_pages(gfp_t, unsigned int, struct zonelist *)); 106 107 static inline struct page *alloc_pages_node(int nid, gfp_t gfp_mask, 108 unsigned int order) 109 { 110 if (unlikely(order >= MAX_ORDER)) 111 return NULL; 112 113 /* Unknown node is current node */ 114 if (nid < 0) 115 nid = numa_node_id(); 116 117 return __alloc_pages(gfp_mask, order, 118 NODE_DATA(nid)->node_zonelists + gfp_zone(gfp_mask)); 119 } 120 121 #ifdef CONFIG_NUMA 122 extern struct page *alloc_pages_current(gfp_t gfp_mask, unsigned order); 123 124 static inline struct page * 125 alloc_pages(gfp_t gfp_mask, unsigned int order) 126 { 127 if (unlikely(order >= MAX_ORDER)) 128 return NULL; 129 130 return alloc_pages_current(gfp_mask, order); 131 } 132 extern struct page *alloc_page_vma(gfp_t gfp_mask, 133 struct vm_area_struct *vma, unsigned long addr); 134 #else 135 #define alloc_pages(gfp_mask, order) \ 136 alloc_pages_node(numa_node_id(), gfp_mask, order) 137 #define alloc_page_vma(gfp_mask, vma, addr) alloc_pages(gfp_mask, 0) 138 #endif 139 #define alloc_page(gfp_mask) alloc_pages(gfp_mask, 0) 140 141 extern unsigned long FASTCALL(__get_free_pages(gfp_t gfp_mask, unsigned int order)); 142 extern unsigned long FASTCALL(get_zeroed_page(gfp_t gfp_mask)); 143 144 #define __get_free_page(gfp_mask) \ 145 __get_free_pages((gfp_mask),0) 146 147 #define __get_dma_pages(gfp_mask, order) \ 148 __get_free_pages((gfp_mask) | GFP_DMA,(order)) 149 150 extern void FASTCALL(__free_pages(struct page *page, unsigned int order)); 151 extern void FASTCALL(free_pages(unsigned long addr, unsigned int order)); 152 extern void FASTCALL(free_hot_page(struct page *page)); 153 extern void FASTCALL(free_cold_page(struct page *page)); 154 155 #define __free_page(page) __free_pages((page), 0) 156 #define free_page(addr) free_pages((addr),0) 157 158 void page_alloc_init(void); 159 #ifdef CONFIG_NUMA 160 void drain_remote_pages(void); 161 #else 162 static inline void drain_remote_pages(void) { }; 163 #endif 164 165 #endif /* __LINUX_GFP_H */ 166