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Diffstat (limited to 'include/linux/gfp.h')
| -rw-r--r-- | include/linux/gfp.h | 375 |
1 files changed, 375 insertions, 0 deletions
diff --git a/include/linux/gfp.h b/include/linux/gfp.h new file mode 100644 index 00000000..cb408925 --- /dev/null +++ b/include/linux/gfp.h @@ -0,0 +1,375 @@ +#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; + +/* Plain integer GFP bitmasks. Do not use this directly. */ +#define ___GFP_DMA 0x01u +#define ___GFP_HIGHMEM 0x02u +#define ___GFP_DMA32 0x04u +#define ___GFP_MOVABLE 0x08u +#define ___GFP_WAIT 0x10u +#define ___GFP_HIGH 0x20u +#define ___GFP_IO 0x40u +#define ___GFP_FS 0x80u +#define ___GFP_COLD 0x100u +#define ___GFP_NOWARN 0x200u +#define ___GFP_REPEAT 0x400u +#define ___GFP_NOFAIL 0x800u +#define ___GFP_NORETRY 0x1000u +#define ___GFP_COMP 0x4000u +#define ___GFP_ZERO 0x8000u +#define ___GFP_NOMEMALLOC 0x10000u +#define ___GFP_HARDWALL 0x20000u +#define ___GFP_THISNODE 0x40000u +#define ___GFP_RECLAIMABLE 0x80000u +#ifdef CONFIG_KMEMCHECK +#define ___GFP_NOTRACK 0x200000u +#else +#define ___GFP_NOTRACK 0 +#endif +#define ___GFP_NO_KSWAPD 0x400000u +#define ___GFP_OTHER_NODE 0x800000u + +/* + * 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 them consistently. The definitions here may + * be used in bit comparisons. + */ +#define __GFP_DMA ((__force gfp_t)___GFP_DMA) +#define __GFP_HIGHMEM ((__force gfp_t)___GFP_HIGHMEM) +#define __GFP_DMA32 ((__force gfp_t)___GFP_DMA32) +#define __GFP_MOVABLE ((__force gfp_t)___GFP_MOVABLE) /* 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. This modifier is deprecated and no new + * users should be added. + * + * __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)___GFP_WAIT) /* Can wait and reschedule? */ +#define __GFP_HIGH ((__force gfp_t)___GFP_HIGH) /* Should access emergency pools? */ +#define __GFP_IO ((__force gfp_t)___GFP_IO) /* Can start physical IO? */ +#define __GFP_FS ((__force gfp_t)___GFP_FS) /* Can call down to low-level FS? */ +#define __GFP_COLD ((__force gfp_t)___GFP_COLD) /* Cache-cold page required */ +#define __GFP_NOWARN ((__force gfp_t)___GFP_NOWARN) /* Suppress page allocation failure warning */ +#define __GFP_REPEAT ((__force gfp_t)___GFP_REPEAT) /* See above */ +#define __GFP_NOFAIL ((__force gfp_t)___GFP_NOFAIL) /* See above */ +#define __GFP_NORETRY ((__force gfp_t)___GFP_NORETRY) /* See above */ +#define __GFP_COMP ((__force gfp_t)___GFP_COMP) /* Add compound page metadata */ +#define __GFP_ZERO ((__force gfp_t)___GFP_ZERO) /* Return zeroed page on success */ +#define __GFP_NOMEMALLOC ((__force gfp_t)___GFP_NOMEMALLOC) /* Don't use emergency reserves */ +#define __GFP_HARDWALL ((__force gfp_t)___GFP_HARDWALL) /* Enforce hardwall cpuset memory allocs */ +#define __GFP_THISNODE ((__force gfp_t)___GFP_THISNODE)/* No fallback, no policies */ +#define __GFP_RECLAIMABLE ((__force gfp_t)___GFP_RECLAIMABLE) /* Page is reclaimable */ +#define __GFP_NOTRACK ((__force gfp_t)___GFP_NOTRACK) /* Don't track with kmemcheck */ + +#define __GFP_NO_KSWAPD ((__force gfp_t)___GFP_NO_KSWAPD) +#define __GFP_OTHER_NODE ((__force gfp_t)___GFP_OTHER_NODE) /* On behalf of other node */ + +/* + * 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 23 /* Room for 23 __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) +#define GFP_IOFS (__GFP_IO | __GFP_FS) +#define GFP_TRANSHUGE (GFP_HIGHUSER_MOVABLE | __GFP_COMP | \ + __GFP_NOMEMALLOC | __GFP_NORETRY | __GFP_NOWARN | \ + __GFP_NO_KSWAPD) + +#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 1 bit of the lowest 3 bits (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 combinations 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 = (__force int) (flags & GFP_ZONEMASK); + + z = (GFP_ZONE_TABLE >> (bit * ZONES_SHIFT)) & + ((1 << ZONES_SHIFT) - 1); + VM_BUG_ON((GFP_ZONE_BAD >> bit) & 1); + 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_pages_vma(gfp_t gfp_mask, int order, + struct vm_area_struct *vma, unsigned long addr, + int node); +#else +#define alloc_pages(gfp_mask, order) \ + alloc_pages_node(numa_node_id(), gfp_mask, order) +#define alloc_pages_vma(gfp_mask, order, vma, addr, node) \ + alloc_pages(gfp_mask, order) +#endif +#define alloc_page(gfp_mask) alloc_pages(gfp_mask, 0) +#define alloc_page_vma(gfp_mask, vma, addr) \ + alloc_pages_vma(gfp_mask, 0, vma, addr, numa_node_id()) +#define alloc_page_vma_node(gfp_mask, vma, addr, node) \ + alloc_pages_vma(gfp_mask, 0, vma, addr, node) + +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); +/* This is different from alloc_pages_exact_node !!! */ +void *alloc_pages_exact_nid(int nid, size_t size, gfp_t gfp_mask); + +#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; + +extern void pm_restrict_gfp_mask(void); +extern void pm_restore_gfp_mask(void); + +#endif /* __LINUX_GFP_H */ |