| #ifndef __LINUX_GFP_H |
| #define __LINUX_GFP_H |
| |
| #include <linux/mmzone.h> |
| #include <linux/stddef.h> |
| #include <linux/linkage.h> |
| #include <linux/topology.h> |
| #include <linux/mmdebug.h> |
| |
| struct vm_area_struct; |
| |
| /* |
| * GFP bitmasks.. |
| * |
| * Zone modifiers (see linux/mmzone.h - low three bits) |
| * |
| * Do not put any conditional on these. If necessary modify the definitions |
| * without the underscores and use the consistently. The definitions here may |
| * be used in bit comparisons. |
| */ |
| #define __GFP_DMA ((__force gfp_t)0x01u) |
| #define __GFP_HIGHMEM ((__force gfp_t)0x02u) |
| #define __GFP_DMA32 ((__force gfp_t)0x04u) |
| #define __GFP_MOVABLE ((__force gfp_t)0x08u) /* Page is movable */ |
| #define GFP_ZONEMASK (__GFP_DMA|__GFP_HIGHMEM|__GFP_DMA32|__GFP_MOVABLE) |
| /* |
| * Action modifiers - doesn't change the zoning |
| * |
| * __GFP_REPEAT: Try hard to allocate the memory, but the allocation attempt |
| * _might_ fail. This depends upon the particular VM implementation. |
| * |
| * __GFP_NOFAIL: The VM implementation _must_ retry infinitely: the caller |
| * cannot handle allocation failures. |
| * |
| * __GFP_NORETRY: The VM implementation must not retry indefinitely. |
| * |
| * __GFP_MOVABLE: Flag that this page will be movable by the page migration |
| * mechanism or reclaimed |
| */ |
| #define __GFP_WAIT ((__force gfp_t)0x10u) /* Can wait and reschedule? */ |
| #define __GFP_HIGH ((__force gfp_t)0x20u) /* Should access emergency pools? */ |
| #define __GFP_IO ((__force gfp_t)0x40u) /* Can start physical IO? */ |
| #define __GFP_FS ((__force gfp_t)0x80u) /* Can call down to low-level FS? */ |
| #define __GFP_COLD ((__force gfp_t)0x100u) /* Cache-cold page required */ |
| #define __GFP_NOWARN ((__force gfp_t)0x200u) /* Suppress page allocation failure warning */ |
| #define __GFP_REPEAT ((__force gfp_t)0x400u) /* See above */ |
| #define __GFP_NOFAIL ((__force gfp_t)0x800u) /* See above */ |
| #define __GFP_NORETRY ((__force gfp_t)0x1000u)/* See above */ |
| #define __GFP_COMP ((__force gfp_t)0x4000u)/* Add compound page metadata */ |
| #define __GFP_ZERO ((__force gfp_t)0x8000u)/* Return zeroed page on success */ |
| #define __GFP_NOMEMALLOC ((__force gfp_t)0x10000u) /* Don't use emergency reserves */ |
| #define __GFP_HARDWALL ((__force gfp_t)0x20000u) /* Enforce hardwall cpuset memory allocs */ |
| #define __GFP_THISNODE ((__force gfp_t)0x40000u)/* No fallback, no policies */ |
| #define __GFP_RECLAIMABLE ((__force gfp_t)0x80000u) /* Page is reclaimable */ |
| |
| #ifdef CONFIG_KMEMCHECK |
| #define __GFP_NOTRACK ((__force gfp_t)0x200000u) /* Don't track with kmemcheck */ |
| #else |
| #define __GFP_NOTRACK ((__force gfp_t)0) |
| #endif |
| |
| /* |
| * This may seem redundant, but it's a way of annotating false positives vs. |
| * allocations that simply cannot be supported (e.g. page tables). |
| */ |
| #define __GFP_NOTRACK_FALSE_POSITIVE (__GFP_NOTRACK) |
| |
| #define __GFP_BITS_SHIFT 22 /* Room for 22 __GFP_FOO bits */ |
| #define __GFP_BITS_MASK ((__force gfp_t)((1 << __GFP_BITS_SHIFT) - 1)) |
| |
| /* This equals 0, but use constants in case they ever change */ |
| #define GFP_NOWAIT (GFP_ATOMIC & ~__GFP_HIGH) |
| /* GFP_ATOMIC means both !wait (__GFP_WAIT not set) and use emergency pool */ |
| #define GFP_ATOMIC (__GFP_HIGH) |
| #define GFP_NOIO (__GFP_WAIT) |
| #define GFP_NOFS (__GFP_WAIT | __GFP_IO) |
| #define GFP_KERNEL (__GFP_WAIT | __GFP_IO | __GFP_FS) |
| #define GFP_TEMPORARY (__GFP_WAIT | __GFP_IO | __GFP_FS | \ |
| __GFP_RECLAIMABLE) |
| #define GFP_USER (__GFP_WAIT | __GFP_IO | __GFP_FS | __GFP_HARDWALL) |
| #define GFP_HIGHUSER (__GFP_WAIT | __GFP_IO | __GFP_FS | __GFP_HARDWALL | \ |
| __GFP_HIGHMEM) |
| #define GFP_HIGHUSER_MOVABLE (__GFP_WAIT | __GFP_IO | __GFP_FS | \ |
| __GFP_HARDWALL | __GFP_HIGHMEM | \ |
| __GFP_MOVABLE) |
| |
| #ifdef CONFIG_NUMA |
| #define GFP_THISNODE (__GFP_THISNODE | __GFP_NOWARN | __GFP_NORETRY) |
| #else |
| #define GFP_THISNODE ((__force gfp_t)0) |
| #endif |
| |
| /* This mask makes up all the page movable related flags */ |
| #define GFP_MOVABLE_MASK (__GFP_RECLAIMABLE|__GFP_MOVABLE) |
| |
| /* Control page allocator reclaim behavior */ |
| #define GFP_RECLAIM_MASK (__GFP_WAIT|__GFP_HIGH|__GFP_IO|__GFP_FS|\ |
| __GFP_NOWARN|__GFP_REPEAT|__GFP_NOFAIL|\ |
| __GFP_NORETRY|__GFP_NOMEMALLOC) |
| |
| /* Control slab gfp mask during early boot */ |
| #define GFP_BOOT_MASK __GFP_BITS_MASK & ~(__GFP_WAIT|__GFP_IO|__GFP_FS) |
| |
| /* Control allocation constraints */ |
| #define GFP_CONSTRAINT_MASK (__GFP_HARDWALL|__GFP_THISNODE) |
| |
| /* Do not use these with a slab allocator */ |
| #define GFP_SLAB_BUG_MASK (__GFP_DMA32|__GFP_HIGHMEM|~__GFP_BITS_MASK) |
| |
| /* Flag - indicates that the buffer will be suitable for DMA. Ignored on some |
| platforms, used as appropriate on others */ |
| |
| #define GFP_DMA __GFP_DMA |
| |
| /* 4GB DMA on some platforms */ |
| #define GFP_DMA32 __GFP_DMA32 |
| |
| /* Convert GFP flags to their corresponding migrate type */ |
| static inline int allocflags_to_migratetype(gfp_t gfp_flags) |
| { |
| WARN_ON((gfp_flags & GFP_MOVABLE_MASK) == GFP_MOVABLE_MASK); |
| |
| if (unlikely(page_group_by_mobility_disabled)) |
| return MIGRATE_UNMOVABLE; |
| |
| /* Group based on mobility */ |
| return (((gfp_flags & __GFP_MOVABLE) != 0) << 1) | |
| ((gfp_flags & __GFP_RECLAIMABLE) != 0); |
| } |
| |
| #ifdef CONFIG_HIGHMEM |
| #define OPT_ZONE_HIGHMEM ZONE_HIGHMEM |
| #else |
| #define OPT_ZONE_HIGHMEM ZONE_NORMAL |
| #endif |
| |
| #ifdef CONFIG_ZONE_DMA |
| #define OPT_ZONE_DMA ZONE_DMA |
| #else |
| #define OPT_ZONE_DMA ZONE_NORMAL |
| #endif |
| |
| #ifdef CONFIG_ZONE_DMA32 |
| #define OPT_ZONE_DMA32 ZONE_DMA32 |
| #else |
| #define OPT_ZONE_DMA32 ZONE_NORMAL |
| #endif |
| |
| /* |
| * GFP_ZONE_TABLE is a word size bitstring that is used for looking up the |
| * zone to use given the lowest 4 bits of gfp_t. Entries are ZONE_SHIFT long |
| * and there are 16 of them to cover all possible combinations of |
| * __GFP_DMA, __GFP_DMA32, __GFP_MOVABLE and __GFP_HIGHMEM |
| * |
| * The zone fallback order is MOVABLE=>HIGHMEM=>NORMAL=>DMA32=>DMA. |
| * But GFP_MOVABLE is not only a zone specifier but also an allocation |
| * policy. Therefore __GFP_MOVABLE plus another zone selector is valid. |
| * Only 1bit of the lowest 3 bit (DMA,DMA32,HIGHMEM) can be set to "1". |
| * |
| * bit result |
| * ================= |
| * 0x0 => NORMAL |
| * 0x1 => DMA or NORMAL |
| * 0x2 => HIGHMEM or NORMAL |
| * 0x3 => BAD (DMA+HIGHMEM) |
| * 0x4 => DMA32 or DMA or NORMAL |
| * 0x5 => BAD (DMA+DMA32) |
| * 0x6 => BAD (HIGHMEM+DMA32) |
| * 0x7 => BAD (HIGHMEM+DMA32+DMA) |
| * 0x8 => NORMAL (MOVABLE+0) |
| * 0x9 => DMA or NORMAL (MOVABLE+DMA) |
| * 0xa => MOVABLE (Movable is valid only if HIGHMEM is set too) |
| * 0xb => BAD (MOVABLE+HIGHMEM+DMA) |
| * 0xc => DMA32 (MOVABLE+HIGHMEM+DMA32) |
| * 0xd => BAD (MOVABLE+DMA32+DMA) |
| * 0xe => BAD (MOVABLE+DMA32+HIGHMEM) |
| * 0xf => BAD (MOVABLE+DMA32+HIGHMEM+DMA) |
| * |
| * ZONES_SHIFT must be <= 2 on 32 bit platforms. |
| */ |
| |
| #if 16 * ZONES_SHIFT > BITS_PER_LONG |
| #error ZONES_SHIFT too large to create GFP_ZONE_TABLE integer |
| #endif |
| |
| #define GFP_ZONE_TABLE ( \ |
| (ZONE_NORMAL << 0 * ZONES_SHIFT) \ |
| | (OPT_ZONE_DMA << __GFP_DMA * ZONES_SHIFT) \ |
| | (OPT_ZONE_HIGHMEM << __GFP_HIGHMEM * ZONES_SHIFT) \ |
| | (OPT_ZONE_DMA32 << __GFP_DMA32 * ZONES_SHIFT) \ |
| | (ZONE_NORMAL << __GFP_MOVABLE * ZONES_SHIFT) \ |
| | (OPT_ZONE_DMA << (__GFP_MOVABLE | __GFP_DMA) * ZONES_SHIFT) \ |
| | (ZONE_MOVABLE << (__GFP_MOVABLE | __GFP_HIGHMEM) * ZONES_SHIFT)\ |
| | (OPT_ZONE_DMA32 << (__GFP_MOVABLE | __GFP_DMA32) * ZONES_SHIFT)\ |
| ) |
| |
| /* |
| * GFP_ZONE_BAD is a bitmap for all combination of __GFP_DMA, __GFP_DMA32 |
| * __GFP_HIGHMEM and __GFP_MOVABLE that are not permitted. One flag per |
| * entry starting with bit 0. Bit is set if the combination is not |
| * allowed. |
| */ |
| #define GFP_ZONE_BAD ( \ |
| 1 << (__GFP_DMA | __GFP_HIGHMEM) \ |
| | 1 << (__GFP_DMA | __GFP_DMA32) \ |
| | 1 << (__GFP_DMA32 | __GFP_HIGHMEM) \ |
| | 1 << (__GFP_DMA | __GFP_DMA32 | __GFP_HIGHMEM) \ |
| | 1 << (__GFP_MOVABLE | __GFP_HIGHMEM | __GFP_DMA) \ |
| | 1 << (__GFP_MOVABLE | __GFP_DMA32 | __GFP_DMA) \ |
| | 1 << (__GFP_MOVABLE | __GFP_DMA32 | __GFP_HIGHMEM) \ |
| | 1 << (__GFP_MOVABLE | __GFP_DMA32 | __GFP_DMA | __GFP_HIGHMEM)\ |
| ) |
| |
| static inline enum zone_type gfp_zone(gfp_t flags) |
| { |
| enum zone_type z; |
| int bit = flags & GFP_ZONEMASK; |
| |
| z = (GFP_ZONE_TABLE >> (bit * ZONES_SHIFT)) & |
| ((1 << ZONES_SHIFT) - 1); |
| |
| if (__builtin_constant_p(bit)) |
| MAYBE_BUILD_BUG_ON((GFP_ZONE_BAD >> bit) & 1); |
| else { |
| #ifdef CONFIG_DEBUG_VM |
| BUG_ON((GFP_ZONE_BAD >> bit) & 1); |
| #endif |
| } |
| return z; |
| } |
| |
| /* |
| * There is only one page-allocator function, and two main namespaces to |
| * it. The alloc_page*() variants return 'struct page *' and as such |
| * can allocate highmem pages, the *get*page*() variants return |
| * virtual kernel addresses to the allocated page(s). |
| */ |
| |
| static inline int gfp_zonelist(gfp_t flags) |
| { |
| if (NUMA_BUILD && unlikely(flags & __GFP_THISNODE)) |
| return 1; |
| |
| return 0; |
| } |
| |
| /* |
| * We get the zone list from the current node and the gfp_mask. |
| * This zone list contains a maximum of MAXNODES*MAX_NR_ZONES zones. |
| * There are two zonelists per node, one for all zones with memory and |
| * one containing just zones from the node the zonelist belongs to. |
| * |
| * For the normal case of non-DISCONTIGMEM systems the NODE_DATA() gets |
| * optimized to &contig_page_data at compile-time. |
| */ |
| static inline struct zonelist *node_zonelist(int nid, gfp_t flags) |
| { |
| return NODE_DATA(nid)->node_zonelists + gfp_zonelist(flags); |
| } |
| |
| #ifndef HAVE_ARCH_FREE_PAGE |
| static inline void arch_free_page(struct page *page, int order) { } |
| #endif |
| #ifndef HAVE_ARCH_ALLOC_PAGE |
| static inline void arch_alloc_page(struct page *page, int order) { } |
| #endif |
| |
| struct page * |
| __alloc_pages_nodemask(gfp_t gfp_mask, unsigned int order, |
| struct zonelist *zonelist, nodemask_t *nodemask); |
| |
| static inline struct page * |
| __alloc_pages(gfp_t gfp_mask, unsigned int order, |
| struct zonelist *zonelist) |
| { |
| return __alloc_pages_nodemask(gfp_mask, order, zonelist, NULL); |
| } |
| |
| static inline struct page *alloc_pages_node(int nid, gfp_t gfp_mask, |
| unsigned int order) |
| { |
| /* Unknown node is current node */ |
| if (nid < 0) |
| nid = numa_node_id(); |
| |
| return __alloc_pages(gfp_mask, order, node_zonelist(nid, gfp_mask)); |
| } |
| |
| static inline struct page *alloc_pages_exact_node(int nid, gfp_t gfp_mask, |
| unsigned int order) |
| { |
| VM_BUG_ON(nid < 0 || nid >= MAX_NUMNODES); |
| |
| return __alloc_pages(gfp_mask, order, node_zonelist(nid, gfp_mask)); |
| } |
| |
| #ifdef CONFIG_NUMA |
| extern struct page *alloc_pages_current(gfp_t gfp_mask, unsigned order); |
| |
| static inline struct page * |
| alloc_pages(gfp_t gfp_mask, unsigned int order) |
| { |
| return alloc_pages_current(gfp_mask, order); |
| } |
| extern struct page *alloc_page_vma(gfp_t gfp_mask, |
| struct vm_area_struct *vma, unsigned long addr); |
| #else |
| #define alloc_pages(gfp_mask, order) \ |
| alloc_pages_node(numa_node_id(), gfp_mask, order) |
| #define alloc_page_vma(gfp_mask, vma, addr) alloc_pages(gfp_mask, 0) |
| #endif |
| #define alloc_page(gfp_mask) alloc_pages(gfp_mask, 0) |
| |
| extern unsigned long __get_free_pages(gfp_t gfp_mask, unsigned int order); |
| extern unsigned long get_zeroed_page(gfp_t gfp_mask); |
| |
| void *alloc_pages_exact(size_t size, gfp_t gfp_mask); |
| void free_pages_exact(void *virt, size_t size); |
| |
| #define __get_free_page(gfp_mask) \ |
| __get_free_pages((gfp_mask),0) |
| |
| #define __get_dma_pages(gfp_mask, order) \ |
| __get_free_pages((gfp_mask) | GFP_DMA,(order)) |
| |
| extern void __free_pages(struct page *page, unsigned int order); |
| extern void free_pages(unsigned long addr, unsigned int order); |
| extern void free_hot_cold_page(struct page *page, int cold); |
| |
| #define __free_page(page) __free_pages((page), 0) |
| #define free_page(addr) free_pages((addr),0) |
| |
| void page_alloc_init(void); |
| void drain_zone_pages(struct zone *zone, struct per_cpu_pages *pcp); |
| void drain_all_pages(void); |
| void drain_local_pages(void *dummy); |
| |
| extern gfp_t gfp_allowed_mask; |
| |
| static inline void set_gfp_allowed_mask(gfp_t mask) |
| { |
| gfp_allowed_mask = mask; |
| } |
| |
| #endif /* __LINUX_GFP_H */ |