367 lines
12 KiB
C
367 lines
12 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef __LINUX_GFP_H
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#define __LINUX_GFP_H
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#include <linux/gfp_types.h>
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#include <linux/mmzone.h>
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#include <linux/topology.h>
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struct vm_area_struct;
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/* Convert GFP flags to their corresponding migrate type */
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#define GFP_MOVABLE_MASK (__GFP_RECLAIMABLE|__GFP_MOVABLE)
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#define GFP_MOVABLE_SHIFT 3
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static inline int gfp_migratetype(const gfp_t gfp_flags)
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{
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VM_WARN_ON((gfp_flags & GFP_MOVABLE_MASK) == GFP_MOVABLE_MASK);
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BUILD_BUG_ON((1UL << GFP_MOVABLE_SHIFT) != ___GFP_MOVABLE);
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BUILD_BUG_ON((___GFP_MOVABLE >> GFP_MOVABLE_SHIFT) != MIGRATE_MOVABLE);
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BUILD_BUG_ON((___GFP_RECLAIMABLE >> GFP_MOVABLE_SHIFT) != MIGRATE_RECLAIMABLE);
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BUILD_BUG_ON(((___GFP_MOVABLE | ___GFP_RECLAIMABLE) >>
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GFP_MOVABLE_SHIFT) != MIGRATE_HIGHATOMIC);
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if (unlikely(page_group_by_mobility_disabled))
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return MIGRATE_UNMOVABLE;
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/* Group based on mobility */
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return (__force unsigned long)(gfp_flags & GFP_MOVABLE_MASK) >> GFP_MOVABLE_SHIFT;
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}
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#undef GFP_MOVABLE_MASK
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#undef GFP_MOVABLE_SHIFT
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static inline bool gfpflags_allow_blocking(const gfp_t gfp_flags)
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{
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return !!(gfp_flags & __GFP_DIRECT_RECLAIM);
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}
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#ifdef CONFIG_HIGHMEM
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#define OPT_ZONE_HIGHMEM ZONE_HIGHMEM
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#else
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#define OPT_ZONE_HIGHMEM ZONE_NORMAL
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#endif
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#ifdef CONFIG_ZONE_DMA
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#define OPT_ZONE_DMA ZONE_DMA
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#else
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#define OPT_ZONE_DMA ZONE_NORMAL
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#endif
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#ifdef CONFIG_ZONE_DMA32
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#define OPT_ZONE_DMA32 ZONE_DMA32
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#else
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#define OPT_ZONE_DMA32 ZONE_NORMAL
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#endif
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/*
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* GFP_ZONE_TABLE is a word size bitstring that is used for looking up the
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* zone to use given the lowest 4 bits of gfp_t. Entries are GFP_ZONES_SHIFT
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* bits long and there are 16 of them to cover all possible combinations of
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* __GFP_DMA, __GFP_DMA32, __GFP_MOVABLE and __GFP_HIGHMEM.
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*
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* The zone fallback order is MOVABLE=>HIGHMEM=>NORMAL=>DMA32=>DMA.
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* But GFP_MOVABLE is not only a zone specifier but also an allocation
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* policy. Therefore __GFP_MOVABLE plus another zone selector is valid.
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* Only 1 bit of the lowest 3 bits (DMA,DMA32,HIGHMEM) can be set to "1".
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*
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* bit result
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* =================
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* 0x0 => NORMAL
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* 0x1 => DMA or NORMAL
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* 0x2 => HIGHMEM or NORMAL
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* 0x3 => BAD (DMA+HIGHMEM)
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* 0x4 => DMA32 or NORMAL
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* 0x5 => BAD (DMA+DMA32)
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* 0x6 => BAD (HIGHMEM+DMA32)
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* 0x7 => BAD (HIGHMEM+DMA32+DMA)
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* 0x8 => NORMAL (MOVABLE+0)
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* 0x9 => DMA or NORMAL (MOVABLE+DMA)
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* 0xa => MOVABLE (Movable is valid only if HIGHMEM is set too)
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* 0xb => BAD (MOVABLE+HIGHMEM+DMA)
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* 0xc => DMA32 or NORMAL (MOVABLE+DMA32)
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* 0xd => BAD (MOVABLE+DMA32+DMA)
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* 0xe => BAD (MOVABLE+DMA32+HIGHMEM)
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* 0xf => BAD (MOVABLE+DMA32+HIGHMEM+DMA)
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*
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* GFP_ZONES_SHIFT must be <= 2 on 32 bit platforms.
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*/
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#if defined(CONFIG_ZONE_DEVICE) && (MAX_NR_ZONES-1) <= 4
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/* ZONE_DEVICE is not a valid GFP zone specifier */
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#define GFP_ZONES_SHIFT 2
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#else
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#define GFP_ZONES_SHIFT ZONES_SHIFT
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#endif
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#if 16 * GFP_ZONES_SHIFT > BITS_PER_LONG
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#error GFP_ZONES_SHIFT too large to create GFP_ZONE_TABLE integer
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#endif
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#define GFP_ZONE_TABLE ( \
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(ZONE_NORMAL << 0 * GFP_ZONES_SHIFT) \
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| (OPT_ZONE_DMA << ___GFP_DMA * GFP_ZONES_SHIFT) \
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| (OPT_ZONE_HIGHMEM << ___GFP_HIGHMEM * GFP_ZONES_SHIFT) \
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| (OPT_ZONE_DMA32 << ___GFP_DMA32 * GFP_ZONES_SHIFT) \
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| (ZONE_NORMAL << ___GFP_MOVABLE * GFP_ZONES_SHIFT) \
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| (OPT_ZONE_DMA << (___GFP_MOVABLE | ___GFP_DMA) * GFP_ZONES_SHIFT) \
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| (ZONE_MOVABLE << (___GFP_MOVABLE | ___GFP_HIGHMEM) * GFP_ZONES_SHIFT)\
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| (OPT_ZONE_DMA32 << (___GFP_MOVABLE | ___GFP_DMA32) * GFP_ZONES_SHIFT)\
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)
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/*
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* GFP_ZONE_BAD is a bitmap for all combinations of __GFP_DMA, __GFP_DMA32
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* __GFP_HIGHMEM and __GFP_MOVABLE that are not permitted. One flag per
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* entry starting with bit 0. Bit is set if the combination is not
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* allowed.
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*/
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#define GFP_ZONE_BAD ( \
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1 << (___GFP_DMA | ___GFP_HIGHMEM) \
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| 1 << (___GFP_DMA | ___GFP_DMA32) \
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| 1 << (___GFP_DMA32 | ___GFP_HIGHMEM) \
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| 1 << (___GFP_DMA | ___GFP_DMA32 | ___GFP_HIGHMEM) \
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| 1 << (___GFP_MOVABLE | ___GFP_HIGHMEM | ___GFP_DMA) \
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| 1 << (___GFP_MOVABLE | ___GFP_DMA32 | ___GFP_DMA) \
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| 1 << (___GFP_MOVABLE | ___GFP_DMA32 | ___GFP_HIGHMEM) \
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| 1 << (___GFP_MOVABLE | ___GFP_DMA32 | ___GFP_DMA | ___GFP_HIGHMEM) \
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)
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static inline enum zone_type gfp_zone(gfp_t flags)
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{
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enum zone_type z;
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int bit = (__force int) (flags & GFP_ZONEMASK);
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z = (GFP_ZONE_TABLE >> (bit * GFP_ZONES_SHIFT)) &
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((1 << GFP_ZONES_SHIFT) - 1);
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VM_BUG_ON((GFP_ZONE_BAD >> bit) & 1);
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return z;
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}
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/*
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* There is only one page-allocator function, and two main namespaces to
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* it. The alloc_page*() variants return 'struct page *' and as such
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* can allocate highmem pages, the *get*page*() variants return
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* virtual kernel addresses to the allocated page(s).
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*/
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static inline int gfp_zonelist(gfp_t flags)
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{
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#ifdef CONFIG_NUMA
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if (unlikely(flags & __GFP_THISNODE))
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return ZONELIST_NOFALLBACK;
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#endif
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return ZONELIST_FALLBACK;
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}
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/*
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* We get the zone list from the current node and the gfp_mask.
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* This zone list contains a maximum of MAX_NUMNODES*MAX_NR_ZONES zones.
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* There are two zonelists per node, one for all zones with memory and
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* one containing just zones from the node the zonelist belongs to.
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*
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* For the case of non-NUMA systems the NODE_DATA() gets optimized to
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* &contig_page_data at compile-time.
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*/
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static inline struct zonelist *node_zonelist(int nid, gfp_t flags)
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{
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return NODE_DATA(nid)->node_zonelists + gfp_zonelist(flags);
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}
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#ifndef HAVE_ARCH_FREE_PAGE
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static inline void arch_free_page(struct page *page, int order) { }
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#endif
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#ifndef HAVE_ARCH_ALLOC_PAGE
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static inline void arch_alloc_page(struct page *page, int order) { }
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#endif
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struct page *__alloc_pages(gfp_t gfp, unsigned int order, int preferred_nid,
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nodemask_t *nodemask);
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struct folio *__folio_alloc(gfp_t gfp, unsigned int order, int preferred_nid,
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nodemask_t *nodemask);
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unsigned long __alloc_pages_bulk(gfp_t gfp, int preferred_nid,
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nodemask_t *nodemask, int nr_pages,
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struct list_head *page_list,
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struct page **page_array);
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unsigned long alloc_pages_bulk_array_mempolicy(gfp_t gfp,
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unsigned long nr_pages,
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struct page **page_array);
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/* Bulk allocate order-0 pages */
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static inline unsigned long
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alloc_pages_bulk_list(gfp_t gfp, unsigned long nr_pages, struct list_head *list)
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{
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return __alloc_pages_bulk(gfp, numa_mem_id(), NULL, nr_pages, list, NULL);
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}
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static inline unsigned long
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alloc_pages_bulk_array(gfp_t gfp, unsigned long nr_pages, struct page **page_array)
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{
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return __alloc_pages_bulk(gfp, numa_mem_id(), NULL, nr_pages, NULL, page_array);
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}
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static inline unsigned long
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alloc_pages_bulk_array_node(gfp_t gfp, int nid, unsigned long nr_pages, struct page **page_array)
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{
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if (nid == NUMA_NO_NODE)
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nid = numa_mem_id();
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return __alloc_pages_bulk(gfp, nid, NULL, nr_pages, NULL, page_array);
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}
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static inline void warn_if_node_offline(int this_node, gfp_t gfp_mask)
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{
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gfp_t warn_gfp = gfp_mask & (__GFP_THISNODE|__GFP_NOWARN);
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if (warn_gfp != (__GFP_THISNODE|__GFP_NOWARN))
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return;
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if (node_online(this_node))
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return;
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pr_warn("%pGg allocation from offline node %d\n", &gfp_mask, this_node);
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dump_stack();
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}
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/*
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* Allocate pages, preferring the node given as nid. The node must be valid and
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* online. For more general interface, see alloc_pages_node().
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*/
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static inline struct page *
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__alloc_pages_node(int nid, gfp_t gfp_mask, unsigned int order)
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{
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VM_BUG_ON(nid < 0 || nid >= MAX_NUMNODES);
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warn_if_node_offline(nid, gfp_mask);
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return __alloc_pages(gfp_mask, order, nid, NULL);
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}
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static inline
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struct folio *__folio_alloc_node(gfp_t gfp, unsigned int order, int nid)
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{
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VM_BUG_ON(nid < 0 || nid >= MAX_NUMNODES);
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warn_if_node_offline(nid, gfp);
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return __folio_alloc(gfp, order, nid, NULL);
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}
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/*
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* Allocate pages, preferring the node given as nid. When nid == NUMA_NO_NODE,
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* prefer the current CPU's closest node. Otherwise node must be valid and
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* online.
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*/
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static inline struct page *alloc_pages_node(int nid, gfp_t gfp_mask,
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unsigned int order)
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{
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if (nid == NUMA_NO_NODE)
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nid = numa_mem_id();
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return __alloc_pages_node(nid, gfp_mask, order);
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}
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#ifdef CONFIG_NUMA
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struct page *alloc_pages(gfp_t gfp, unsigned int order);
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struct folio *folio_alloc(gfp_t gfp, unsigned order);
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struct folio *vma_alloc_folio(gfp_t gfp, int order, struct vm_area_struct *vma,
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unsigned long addr, bool hugepage);
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#else
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static inline struct page *alloc_pages(gfp_t gfp_mask, unsigned int order)
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{
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return alloc_pages_node(numa_node_id(), gfp_mask, order);
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}
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static inline struct folio *folio_alloc(gfp_t gfp, unsigned int order)
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{
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return __folio_alloc_node(gfp, order, numa_node_id());
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}
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#define vma_alloc_folio(gfp, order, vma, addr, hugepage) \
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folio_alloc(gfp, order)
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#endif
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#define alloc_page(gfp_mask) alloc_pages(gfp_mask, 0)
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static inline struct page *alloc_page_vma(gfp_t gfp,
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struct vm_area_struct *vma, unsigned long addr)
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{
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struct folio *folio = vma_alloc_folio(gfp, 0, vma, addr, false);
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return &folio->page;
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}
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extern unsigned long __get_free_pages(gfp_t gfp_mask, unsigned int order);
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extern unsigned long get_zeroed_page(gfp_t gfp_mask);
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void *alloc_pages_exact(size_t size, gfp_t gfp_mask) __alloc_size(1);
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void free_pages_exact(void *virt, size_t size);
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__meminit void *alloc_pages_exact_nid(int nid, size_t size, gfp_t gfp_mask) __alloc_size(2);
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#define __get_free_page(gfp_mask) \
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__get_free_pages((gfp_mask), 0)
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#define __get_dma_pages(gfp_mask, order) \
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__get_free_pages((gfp_mask) | GFP_DMA, (order))
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extern void __free_pages(struct page *page, unsigned int order);
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extern void free_pages(unsigned long addr, unsigned int order);
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struct page_frag_cache;
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extern void __page_frag_cache_drain(struct page *page, unsigned int count);
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extern void *page_frag_alloc_align(struct page_frag_cache *nc,
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unsigned int fragsz, gfp_t gfp_mask,
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unsigned int align_mask);
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static inline void *page_frag_alloc(struct page_frag_cache *nc,
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unsigned int fragsz, gfp_t gfp_mask)
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{
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return page_frag_alloc_align(nc, fragsz, gfp_mask, ~0u);
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}
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extern void page_frag_free(void *addr);
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#define __free_page(page) __free_pages((page), 0)
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#define free_page(addr) free_pages((addr), 0)
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void page_alloc_init_cpuhp(void);
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void drain_zone_pages(struct zone *zone, struct per_cpu_pages *pcp);
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void drain_all_pages(struct zone *zone);
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void drain_local_pages(struct zone *zone);
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void page_alloc_init_late(void);
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/*
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* gfp_allowed_mask is set to GFP_BOOT_MASK during early boot to restrict what
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* GFP flags are used before interrupts are enabled. Once interrupts are
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* enabled, it is set to __GFP_BITS_MASK while the system is running. During
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* hibernation, it is used by PM to avoid I/O during memory allocation while
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* devices are suspended.
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*/
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extern gfp_t gfp_allowed_mask;
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/* Returns true if the gfp_mask allows use of ALLOC_NO_WATERMARK */
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bool gfp_pfmemalloc_allowed(gfp_t gfp_mask);
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static inline bool gfp_has_io_fs(gfp_t gfp)
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{
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return (gfp & (__GFP_IO | __GFP_FS)) == (__GFP_IO | __GFP_FS);
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}
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/*
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* Check if the gfp flags allow compaction - GFP_NOIO is a really
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* tricky context because the migration might require IO.
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*/
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static inline bool gfp_compaction_allowed(gfp_t gfp_mask)
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{
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return IS_ENABLED(CONFIG_COMPACTION) && (gfp_mask & __GFP_IO);
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}
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extern gfp_t vma_thp_gfp_mask(struct vm_area_struct *vma);
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#ifdef CONFIG_CONTIG_ALLOC
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/* The below functions must be run on a range from a single zone. */
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extern int alloc_contig_range(unsigned long start, unsigned long end,
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unsigned migratetype, gfp_t gfp_mask);
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extern struct page *alloc_contig_pages(unsigned long nr_pages, gfp_t gfp_mask,
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int nid, nodemask_t *nodemask);
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#endif
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void free_contig_range(unsigned long pfn, unsigned long nr_pages);
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#endif /* __LINUX_GFP_H */
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