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Diffstat (limited to 'include/linux/gfp.h')
| -rw-r--r-- | include/linux/gfp.h | 369 |
1 files changed, 369 insertions, 0 deletions
diff --git a/include/linux/gfp.h b/include/linux/gfp.h new file mode 100644 index 000000000..65a78773d --- /dev/null +++ b/include/linux/gfp.h @@ -0,0 +1,369 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +#ifndef __LINUX_GFP_H +#define __LINUX_GFP_H + +#include <linux/gfp_types.h> + +#include <linux/mmzone.h> +#include <linux/topology.h> + +struct vm_area_struct; + +/* Convert GFP flags to their corresponding migrate type */ +#define GFP_MOVABLE_MASK (__GFP_RECLAIMABLE|__GFP_MOVABLE) +#define GFP_MOVABLE_SHIFT 3 + +static inline int gfp_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); + BUILD_BUG_ON((___GFP_RECLAIMABLE >> GFP_MOVABLE_SHIFT) != MIGRATE_RECLAIMABLE); + BUILD_BUG_ON(((___GFP_MOVABLE | ___GFP_RECLAIMABLE) >> + GFP_MOVABLE_SHIFT) != MIGRATE_HIGHATOMIC); + + if (unlikely(page_group_by_mobility_disabled)) + return MIGRATE_UNMOVABLE; + + /* Group based on mobility */ + return (__force unsigned long)(gfp_flags & GFP_MOVABLE_MASK) >> GFP_MOVABLE_SHIFT; +} +#undef GFP_MOVABLE_MASK +#undef 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 GFP_ZONES_SHIFT + * bits 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 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 or NORMAL (MOVABLE+DMA32) + * 0xd => BAD (MOVABLE+DMA32+DMA) + * 0xe => BAD (MOVABLE+DMA32+HIGHMEM) + * 0xf => BAD (MOVABLE+DMA32+HIGHMEM+DMA) + * + * GFP_ZONES_SHIFT must be <= 2 on 32 bit platforms. + */ + +#if defined(CONFIG_ZONE_DEVICE) && (MAX_NR_ZONES-1) <= 4 +/* ZONE_DEVICE is not a valid GFP zone specifier */ +#define GFP_ZONES_SHIFT 2 +#else +#define GFP_ZONES_SHIFT ZONES_SHIFT +#endif + +#if 16 * GFP_ZONES_SHIFT > BITS_PER_LONG +#error GFP_ZONES_SHIFT too large to create GFP_ZONE_TABLE integer +#endif + +#define GFP_ZONE_TABLE ( \ + (ZONE_NORMAL << 0 * GFP_ZONES_SHIFT) \ + | (OPT_ZONE_DMA << ___GFP_DMA * GFP_ZONES_SHIFT) \ + | (OPT_ZONE_HIGHMEM << ___GFP_HIGHMEM * GFP_ZONES_SHIFT) \ + | (OPT_ZONE_DMA32 << ___GFP_DMA32 * GFP_ZONES_SHIFT) \ + | (ZONE_NORMAL << ___GFP_MOVABLE * GFP_ZONES_SHIFT) \ + | (OPT_ZONE_DMA << (___GFP_MOVABLE | ___GFP_DMA) * GFP_ZONES_SHIFT) \ + | (ZONE_MOVABLE << (___GFP_MOVABLE | ___GFP_HIGHMEM) * GFP_ZONES_SHIFT)\ + | (OPT_ZONE_DMA32 << (___GFP_MOVABLE | ___GFP_DMA32) * GFP_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 * GFP_ZONES_SHIFT)) & + ((1 << GFP_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) +{ +#ifdef CONFIG_NUMA + if (unlikely(flags & __GFP_THISNODE)) + return ZONELIST_NOFALLBACK; +#endif + return ZONELIST_FALLBACK; +} + +/* + * We get the zone list from the current node and the gfp_mask. + * This zone list contains a maximum of MAX_NUMNODES*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 case of non-NUMA 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(gfp_t gfp, unsigned int order, int preferred_nid, + nodemask_t *nodemask); +struct folio *__folio_alloc(gfp_t gfp, unsigned int order, int preferred_nid, + nodemask_t *nodemask); + +unsigned long __alloc_pages_bulk(gfp_t gfp, int preferred_nid, + nodemask_t *nodemask, int nr_pages, + struct list_head *page_list, + struct page **page_array); + +unsigned long alloc_pages_bulk_array_mempolicy(gfp_t gfp, + unsigned long nr_pages, + struct page **page_array); + +/* Bulk allocate order-0 pages */ +static inline unsigned long +alloc_pages_bulk_list(gfp_t gfp, unsigned long nr_pages, struct list_head *list) +{ + return __alloc_pages_bulk(gfp, numa_mem_id(), NULL, nr_pages, list, NULL); +} + +static inline unsigned long +alloc_pages_bulk_array(gfp_t gfp, unsigned long nr_pages, struct page **page_array) +{ + return __alloc_pages_bulk(gfp, numa_mem_id(), NULL, nr_pages, NULL, page_array); +} + +static inline unsigned long +alloc_pages_bulk_array_node(gfp_t gfp, int nid, unsigned long nr_pages, struct page **page_array) +{ + if (nid == NUMA_NO_NODE) + nid = numa_mem_id(); + + return __alloc_pages_bulk(gfp, nid, NULL, nr_pages, NULL, page_array); +} + +static inline void warn_if_node_offline(int this_node, gfp_t gfp_mask) +{ + gfp_t warn_gfp = gfp_mask & (__GFP_THISNODE|__GFP_NOWARN); + + if (warn_gfp != (__GFP_THISNODE|__GFP_NOWARN)) + return; + + if (node_online(this_node)) + return; + + pr_warn("%pGg allocation from offline node %d\n", &gfp_mask, this_node); + dump_stack(); +} + +/* + * 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); + warn_if_node_offline(nid, gfp_mask); + + return __alloc_pages(gfp_mask, order, nid, NULL); +} + +static inline +struct folio *__folio_alloc_node(gfp_t gfp, unsigned int order, int nid) +{ + VM_BUG_ON(nid < 0 || nid >= MAX_NUMNODES); + warn_if_node_offline(nid, gfp); + + return __folio_alloc(gfp, order, nid, NULL); +} + +/* + * 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 +struct page *alloc_pages(gfp_t gfp, unsigned int order); +struct folio *folio_alloc(gfp_t gfp, unsigned order); +struct folio *vma_alloc_folio(gfp_t gfp, int order, struct vm_area_struct *vma, + unsigned long addr, bool hugepage); +#else +static inline struct page *alloc_pages(gfp_t gfp_mask, unsigned int order) +{ + return alloc_pages_node(numa_node_id(), gfp_mask, order); +} +static inline struct folio *folio_alloc(gfp_t gfp, unsigned int order) +{ + return __folio_alloc_node(gfp, order, numa_node_id()); +} +#define vma_alloc_folio(gfp, order, vma, addr, hugepage) \ + folio_alloc(gfp, order) +#endif +#define alloc_page(gfp_mask) alloc_pages(gfp_mask, 0) +static inline struct page *alloc_page_vma(gfp_t gfp, + struct vm_area_struct *vma, unsigned long addr) +{ + struct folio *folio = vma_alloc_folio(gfp, 0, vma, addr, false); + + return &folio->page; +} + +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) __alloc_size(1); +void free_pages_exact(void *virt, size_t size); +__meminit void *alloc_pages_exact_nid(int nid, size_t size, gfp_t gfp_mask) __alloc_size(2); + +#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); + +struct page_frag_cache; +extern void __page_frag_cache_drain(struct page *page, unsigned int count); +extern void *page_frag_alloc_align(struct page_frag_cache *nc, + unsigned int fragsz, gfp_t gfp_mask, + unsigned int align_mask); + +static inline void *page_frag_alloc(struct page_frag_cache *nc, + unsigned int fragsz, gfp_t gfp_mask) +{ + return page_frag_alloc_align(nc, fragsz, gfp_mask, ~0u); +} + +extern void page_frag_free(void *addr); + +#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); + +void page_alloc_init_late(void); + +/* + * 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); + +extern gfp_t vma_thp_gfp_mask(struct vm_area_struct *vma); + +#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_CONTIG_ALLOC +/* 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, gfp_t gfp_mask); +extern struct page *alloc_contig_pages(unsigned long nr_pages, gfp_t gfp_mask, + int nid, nodemask_t *nodemask); +#endif +void free_contig_range(unsigned long pfn, unsigned long nr_pages); + +#ifdef CONFIG_CMA +/* CMA stuff */ +extern void init_cma_reserved_pageblock(struct page *page); +#endif + +#endif /* __LINUX_GFP_H */ |