| #ifndef __LINUX_GFP_H |
| #define __LINUX_GFP_H |
| |
| #include <linux/mmdebug.h> |
| #include <linux/mmzone.h> |
| #include <linux/stddef.h> |
| #include <linux/linkage.h> |
| #include <linux/topology.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_RECLAIMABLE 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_MEMALLOC 0x2000u |
| #define ___GFP_COMP 0x4000u |
| #define ___GFP_ZERO 0x8000u |
| #define ___GFP_NOMEMALLOC 0x10000u |
| #define ___GFP_HARDWALL 0x20000u |
| #define ___GFP_THISNODE 0x40000u |
| #define ___GFP_ATOMIC 0x80000u |
| #define ___GFP_NOACCOUNT 0x100000u |
| #define ___GFP_NOTRACK 0x200000u |
| #define ___GFP_DIRECT_RECLAIM 0x400000u |
| #define ___GFP_OTHER_NODE 0x800000u |
| #define ___GFP_WRITE 0x1000000u |
| #define ___GFP_KSWAPD_RECLAIM 0x2000000u |
| /* If the above are modified, __GFP_BITS_SHIFT may need updating */ |
| |
| /* |
| * 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. New users should be evaluated carefully |
| * (and the flag should be used only when there is no reasonable failure policy) |
| * but it is definitely preferable to use the flag rather than opencode endless |
| * loop around allocator. |
| * |
| * __GFP_NORETRY: The VM implementation must not retry indefinitely and will |
| * return NULL when direct reclaim and memory compaction have failed to allow |
| * the allocation to succeed. The OOM killer is not called with the current |
| * implementation. |
| * |
| * __GFP_MOVABLE: Flag that this page will be movable by the page migration |
| * mechanism or reclaimed |
| */ |
| #define __GFP_ATOMIC ((__force gfp_t)___GFP_ATOMIC) /* Caller cannot wait or 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_MEMALLOC ((__force gfp_t)___GFP_MEMALLOC)/* Allow access to emergency reserves */ |
| #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. |
| * This takes precedence over the |
| * __GFP_MEMALLOC flag if both are |
| * set |
| */ |
| #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_NOACCOUNT ((__force gfp_t)___GFP_NOACCOUNT) /* Don't account to kmemcg */ |
| #define __GFP_NOTRACK ((__force gfp_t)___GFP_NOTRACK) /* Don't track with kmemcheck */ |
| |
| #define __GFP_OTHER_NODE ((__force gfp_t)___GFP_OTHER_NODE) /* On behalf of other node */ |
| #define __GFP_WRITE ((__force gfp_t)___GFP_WRITE) /* Allocator intends to dirty page */ |
| |
| /* |
| * A caller that is willing to wait may enter direct reclaim and will |
| * wake kswapd to reclaim pages in the background until the high |
| * watermark is met. A caller may wish to clear __GFP_DIRECT_RECLAIM to |
| * avoid unnecessary delays when a fallback option is available but |
| * still allow kswapd to reclaim in the background. The kswapd flag |
| * can be cleared when the reclaiming of pages would cause unnecessary |
| * disruption. |
| */ |
| #define __GFP_RECLAIM ((__force gfp_t)(___GFP_DIRECT_RECLAIM|___GFP_KSWAPD_RECLAIM)) |
| #define __GFP_DIRECT_RECLAIM ((__force gfp_t)___GFP_DIRECT_RECLAIM) /* Caller can reclaim */ |
| #define __GFP_KSWAPD_RECLAIM ((__force gfp_t)___GFP_KSWAPD_RECLAIM) /* kswapd can wake */ |
| |
| /* |
| * 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 26 /* Room for N __GFP_FOO bits */ |
| #define __GFP_BITS_MASK ((__force gfp_t)((1 << __GFP_BITS_SHIFT) - 1)) |
| |
| /* |
| * GFP_ATOMIC callers can not sleep, need the allocation to succeed. |
| * A lower watermark is applied to allow access to "atomic reserves" |
| */ |
| #define GFP_ATOMIC (__GFP_HIGH|__GFP_ATOMIC|__GFP_KSWAPD_RECLAIM) |
| #define GFP_NOWAIT (__GFP_KSWAPD_RECLAIM) |
| #define GFP_NOIO (__GFP_RECLAIM) |
| #define GFP_NOFS (__GFP_RECLAIM | __GFP_IO) |
| #define GFP_KERNEL (__GFP_RECLAIM | __GFP_IO | __GFP_FS) |
| #define GFP_TEMPORARY (__GFP_RECLAIM | __GFP_IO | __GFP_FS | \ |
| __GFP_RECLAIMABLE) |
| #define GFP_USER (__GFP_RECLAIM | __GFP_IO | __GFP_FS | __GFP_HARDWALL) |
| #define GFP_HIGHUSER (GFP_USER | __GFP_HIGHMEM) |
| #define GFP_HIGHUSER_MOVABLE (GFP_HIGHUSER | __GFP_MOVABLE) |
| #define GFP_TRANSHUGE ((GFP_HIGHUSER_MOVABLE | __GFP_COMP | \ |
| __GFP_NOMEMALLOC | __GFP_NORETRY | __GFP_NOWARN) & \ |
| ~__GFP_KSWAPD_RECLAIM) |
| |
| /* This mask makes up all the page movable related flags */ |
| #define GFP_MOVABLE_MASK (__GFP_RECLAIMABLE|__GFP_MOVABLE) |
| #define GFP_MOVABLE_SHIFT 3 |
| |
| /* Control page allocator reclaim behavior */ |
| #define GFP_RECLAIM_MASK (__GFP_RECLAIM|__GFP_HIGH|__GFP_IO|__GFP_FS|\ |
| __GFP_NOWARN|__GFP_REPEAT|__GFP_NOFAIL|\ |
| __GFP_NORETRY|__GFP_MEMALLOC|__GFP_NOMEMALLOC) |
| |
| /* Control slab gfp mask during early boot */ |
| #define GFP_BOOT_MASK (__GFP_BITS_MASK & ~(__GFP_RECLAIM|__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 gfpflags_to_migratetype(const gfp_t gfp_flags) |
| { |
| VM_WARN_ON((gfp_flags & GFP_MOVABLE_MASK) == GFP_MOVABLE_MASK); |
| BUILD_BUG_ON((1UL << GFP_MOVABLE_SHIFT) != ___GFP_MOVABLE); |
| BUILD_BUG_ON((___GFP_MOVABLE >> GFP_MOVABLE_SHIFT) != MIGRATE_MOVABLE); |
| |
| if (unlikely(page_group_by_mobility_disabled)) |
| return MIGRATE_UNMOVABLE; |
| |
| /* Group based on mobility */ |
| return (gfp_flags & GFP_MOVABLE_MASK) >> GFP_MOVABLE_SHIFT; |
| } |
| |
| static inline bool gfpflags_allow_blocking(const gfp_t gfp_flags) |
| { |
| return gfp_flags & __GFP_DIRECT_RECLAIM; |
| } |
| |
| #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+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 (IS_ENABLED(CONFIG_NUMA) && 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); |
| } |
| |
| /* |
| * Allocate pages, preferring the node given as nid. The node must be valid and |
| * online. For more general interface, see alloc_pages_node(). |
| */ |
| static inline struct page * |
| __alloc_pages_node(int nid, gfp_t gfp_mask, unsigned int order) |
| { |
| VM_BUG_ON(nid < 0 || nid >= MAX_NUMNODES); |
| VM_WARN_ON(!node_online(nid)); |
| |
| return __alloc_pages(gfp_mask, order, node_zonelist(nid, gfp_mask)); |
| } |
| |
| /* |
| * Allocate pages, preferring the node given as nid. When nid == NUMA_NO_NODE, |
| * prefer the current CPU's closest node. Otherwise node must be valid and |
| * online. |
| */ |
| static inline struct page *alloc_pages_node(int nid, gfp_t gfp_mask, |
| unsigned int order) |
| { |
| if (nid == NUMA_NO_NODE) |
| nid = numa_mem_id(); |
| |
| return __alloc_pages_node(nid, gfp_mask, order); |
| } |
| |
| #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, bool hugepage); |
| #define alloc_hugepage_vma(gfp_mask, vma, addr, order) \ |
| alloc_pages_vma(gfp_mask, order, vma, addr, numa_node_id(), true) |
| #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, false)\ |
| alloc_pages(gfp_mask, order) |
| #define alloc_hugepage_vma(gfp_mask, vma, addr, order) \ |
| 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(), false) |
| #define alloc_page_vma_node(gfp_mask, vma, addr, node) \ |
| alloc_pages_vma(gfp_mask, 0, vma, addr, node, false) |
| |
| extern struct page *alloc_kmem_pages(gfp_t gfp_mask, unsigned int order); |
| extern struct page *alloc_kmem_pages_node(int nid, gfp_t gfp_mask, |
| unsigned int order); |
| |
| 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); |
| void * __meminit 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, bool cold); |
| extern void free_hot_cold_page_list(struct list_head *list, bool cold); |
| |
| struct page_frag_cache; |
| extern void *__alloc_page_frag(struct page_frag_cache *nc, |
| unsigned int fragsz, gfp_t gfp_mask); |
| extern void __free_page_frag(void *addr); |
| |
| extern void __free_kmem_pages(struct page *page, unsigned int order); |
| extern void free_kmem_pages(unsigned long addr, unsigned int order); |
| |
| #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(struct zone *zone); |
| void drain_local_pages(struct zone *zone); |
| |
| #ifdef CONFIG_DEFERRED_STRUCT_PAGE_INIT |
| void page_alloc_init_late(void); |
| #else |
| static inline void page_alloc_init_late(void) |
| { |
| } |
| #endif |
| |
| /* |
| * gfp_allowed_mask is set to GFP_BOOT_MASK during early boot to restrict what |
| * GFP flags are used before interrupts are enabled. Once interrupts are |
| * enabled, it is set to __GFP_BITS_MASK while the system is running. During |
| * hibernation, it is used by PM to avoid I/O during memory allocation while |
| * devices are suspended. |
| */ |
| extern gfp_t gfp_allowed_mask; |
| |
| /* Returns true if the gfp_mask allows use of ALLOC_NO_WATERMARK */ |
| bool gfp_pfmemalloc_allowed(gfp_t gfp_mask); |
| |
| extern void pm_restrict_gfp_mask(void); |
| extern void pm_restore_gfp_mask(void); |
| |
| #ifdef CONFIG_PM_SLEEP |
| extern bool pm_suspended_storage(void); |
| #else |
| static inline bool pm_suspended_storage(void) |
| { |
| return false; |
| } |
| #endif /* CONFIG_PM_SLEEP */ |
| |
| #ifdef CONFIG_CMA |
| |
| /* The below functions must be run on a range from a single zone. */ |
| extern int alloc_contig_range(unsigned long start, unsigned long end, |
| unsigned migratetype); |
| extern void free_contig_range(unsigned long pfn, unsigned nr_pages); |
| |
| /* CMA stuff */ |
| extern void init_cma_reserved_pageblock(struct page *page); |
| |
| #endif |
| |
| #endif /* __LINUX_GFP_H */ |