346 lines
12 KiB
C
346 lines
12 KiB
C
#ifndef __LINUX_GFP_H
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#define __LINUX_GFP_H
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#include <linux/mmzone.h>
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#include <linux/stddef.h>
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#include <linux/linkage.h>
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#include <linux/topology.h>
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#include <linux/mmdebug.h>
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struct vm_area_struct;
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/*
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* GFP bitmasks..
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*
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* Zone modifiers (see linux/mmzone.h - low three bits)
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*
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* Do not put any conditional on these. If necessary modify the definitions
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* without the underscores and use the consistently. The definitions here may
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* be used in bit comparisons.
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*/
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#define __GFP_DMA ((__force gfp_t)0x01u)
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#define __GFP_HIGHMEM ((__force gfp_t)0x02u)
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#define __GFP_DMA32 ((__force gfp_t)0x04u)
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#define __GFP_MOVABLE ((__force gfp_t)0x08u) /* Page is movable */
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#define GFP_ZONEMASK (__GFP_DMA|__GFP_HIGHMEM|__GFP_DMA32|__GFP_MOVABLE)
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/*
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* Action modifiers - doesn't change the zoning
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*
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* __GFP_REPEAT: Try hard to allocate the memory, but the allocation attempt
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* _might_ fail. This depends upon the particular VM implementation.
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*
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* __GFP_NOFAIL: The VM implementation _must_ retry infinitely: the caller
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* cannot handle allocation failures.
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*
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* __GFP_NORETRY: The VM implementation must not retry indefinitely.
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*
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* __GFP_MOVABLE: Flag that this page will be movable by the page migration
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* mechanism or reclaimed
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*/
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#define __GFP_WAIT ((__force gfp_t)0x10u) /* Can wait and reschedule? */
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#define __GFP_HIGH ((__force gfp_t)0x20u) /* Should access emergency pools? */
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#define __GFP_IO ((__force gfp_t)0x40u) /* Can start physical IO? */
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#define __GFP_FS ((__force gfp_t)0x80u) /* Can call down to low-level FS? */
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#define __GFP_COLD ((__force gfp_t)0x100u) /* Cache-cold page required */
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#define __GFP_NOWARN ((__force gfp_t)0x200u) /* Suppress page allocation failure warning */
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#define __GFP_REPEAT ((__force gfp_t)0x400u) /* See above */
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#define __GFP_NOFAIL ((__force gfp_t)0x800u) /* See above */
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#define __GFP_NORETRY ((__force gfp_t)0x1000u)/* See above */
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#define __GFP_COMP ((__force gfp_t)0x4000u)/* Add compound page metadata */
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#define __GFP_ZERO ((__force gfp_t)0x8000u)/* Return zeroed page on success */
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#define __GFP_NOMEMALLOC ((__force gfp_t)0x10000u) /* Don't use emergency reserves */
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#define __GFP_HARDWALL ((__force gfp_t)0x20000u) /* Enforce hardwall cpuset memory allocs */
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#define __GFP_THISNODE ((__force gfp_t)0x40000u)/* No fallback, no policies */
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#define __GFP_RECLAIMABLE ((__force gfp_t)0x80000u) /* Page is reclaimable */
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#ifdef CONFIG_KMEMCHECK
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#define __GFP_NOTRACK ((__force gfp_t)0x200000u) /* Don't track with kmemcheck */
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#else
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#define __GFP_NOTRACK ((__force gfp_t)0)
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#endif
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/*
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* This may seem redundant, but it's a way of annotating false positives vs.
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* allocations that simply cannot be supported (e.g. page tables).
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*/
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#define __GFP_NOTRACK_FALSE_POSITIVE (__GFP_NOTRACK)
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#define __GFP_BITS_SHIFT 22 /* Room for 22 __GFP_FOO bits */
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#define __GFP_BITS_MASK ((__force gfp_t)((1 << __GFP_BITS_SHIFT) - 1))
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/* This equals 0, but use constants in case they ever change */
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#define GFP_NOWAIT (GFP_ATOMIC & ~__GFP_HIGH)
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/* GFP_ATOMIC means both !wait (__GFP_WAIT not set) and use emergency pool */
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#define GFP_ATOMIC (__GFP_HIGH)
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#define GFP_NOIO (__GFP_WAIT)
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#define GFP_NOFS (__GFP_WAIT | __GFP_IO)
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#define GFP_KERNEL (__GFP_WAIT | __GFP_IO | __GFP_FS)
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#define GFP_TEMPORARY (__GFP_WAIT | __GFP_IO | __GFP_FS | \
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__GFP_RECLAIMABLE)
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#define GFP_USER (__GFP_WAIT | __GFP_IO | __GFP_FS | __GFP_HARDWALL)
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#define GFP_HIGHUSER (__GFP_WAIT | __GFP_IO | __GFP_FS | __GFP_HARDWALL | \
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__GFP_HIGHMEM)
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#define GFP_HIGHUSER_MOVABLE (__GFP_WAIT | __GFP_IO | __GFP_FS | \
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__GFP_HARDWALL | __GFP_HIGHMEM | \
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__GFP_MOVABLE)
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#ifdef CONFIG_NUMA
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#define GFP_THISNODE (__GFP_THISNODE | __GFP_NOWARN | __GFP_NORETRY)
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#else
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#define GFP_THISNODE ((__force gfp_t)0)
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#endif
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/* This mask makes up all the page movable related flags */
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#define GFP_MOVABLE_MASK (__GFP_RECLAIMABLE|__GFP_MOVABLE)
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/* Control page allocator reclaim behavior */
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#define GFP_RECLAIM_MASK (__GFP_WAIT|__GFP_HIGH|__GFP_IO|__GFP_FS|\
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__GFP_NOWARN|__GFP_REPEAT|__GFP_NOFAIL|\
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__GFP_NORETRY|__GFP_NOMEMALLOC)
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/* Control slab gfp mask during early boot */
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#define GFP_BOOT_MASK __GFP_BITS_MASK & ~(__GFP_WAIT|__GFP_IO|__GFP_FS)
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/* Control allocation constraints */
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#define GFP_CONSTRAINT_MASK (__GFP_HARDWALL|__GFP_THISNODE)
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/* Do not use these with a slab allocator */
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#define GFP_SLAB_BUG_MASK (__GFP_DMA32|__GFP_HIGHMEM|~__GFP_BITS_MASK)
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/* Flag - indicates that the buffer will be suitable for DMA. Ignored on some
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platforms, used as appropriate on others */
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#define GFP_DMA __GFP_DMA
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/* 4GB DMA on some platforms */
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#define GFP_DMA32 __GFP_DMA32
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/* Convert GFP flags to their corresponding migrate type */
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static inline int allocflags_to_migratetype(gfp_t gfp_flags)
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{
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WARN_ON((gfp_flags & GFP_MOVABLE_MASK) == GFP_MOVABLE_MASK);
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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 (((gfp_flags & __GFP_MOVABLE) != 0) << 1) |
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((gfp_flags & __GFP_RECLAIMABLE) != 0);
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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 ZONE_SHIFT long
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* 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 1bit of the lowest 3 bit (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 DMA 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 (MOVABLE+HIGHMEM+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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* ZONES_SHIFT must be <= 2 on 32 bit platforms.
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*/
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#if 16 * ZONES_SHIFT > BITS_PER_LONG
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#error 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 * ZONES_SHIFT) \
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| (OPT_ZONE_DMA << __GFP_DMA * ZONES_SHIFT) \
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| (OPT_ZONE_HIGHMEM << __GFP_HIGHMEM * ZONES_SHIFT) \
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| (OPT_ZONE_DMA32 << __GFP_DMA32 * ZONES_SHIFT) \
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| (ZONE_NORMAL << __GFP_MOVABLE * ZONES_SHIFT) \
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| (OPT_ZONE_DMA << (__GFP_MOVABLE | __GFP_DMA) * ZONES_SHIFT) \
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| (ZONE_MOVABLE << (__GFP_MOVABLE | __GFP_HIGHMEM) * ZONES_SHIFT)\
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| (OPT_ZONE_DMA32 << (__GFP_MOVABLE | __GFP_DMA32) * ZONES_SHIFT)\
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)
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/*
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* GFP_ZONE_BAD is a bitmap for all combination 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 = flags & GFP_ZONEMASK;
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z = (GFP_ZONE_TABLE >> (bit * ZONES_SHIFT)) &
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((1 << ZONES_SHIFT) - 1);
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if (__builtin_constant_p(bit))
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MAYBE_BUILD_BUG_ON((GFP_ZONE_BAD >> bit) & 1);
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else {
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#ifdef CONFIG_DEBUG_VM
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BUG_ON((GFP_ZONE_BAD >> bit) & 1);
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#endif
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}
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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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if (NUMA_BUILD && unlikely(flags & __GFP_THISNODE))
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return 1;
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return 0;
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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 MAXNODES*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 normal case of non-DISCONTIGMEM systems the NODE_DATA() gets
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* optimized to &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 *
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__alloc_pages_nodemask(gfp_t gfp_mask, unsigned int order,
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struct zonelist *zonelist, nodemask_t *nodemask);
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static inline struct page *
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__alloc_pages(gfp_t gfp_mask, unsigned int order,
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struct zonelist *zonelist)
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{
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return __alloc_pages_nodemask(gfp_mask, order, zonelist, NULL);
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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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/* Unknown node is current node */
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if (nid < 0)
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nid = numa_node_id();
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return __alloc_pages(gfp_mask, order, node_zonelist(nid, gfp_mask));
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}
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static inline struct page *alloc_pages_exact_node(int nid, gfp_t gfp_mask,
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unsigned int order)
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{
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VM_BUG_ON(nid < 0 || nid >= MAX_NUMNODES);
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return __alloc_pages(gfp_mask, order, node_zonelist(nid, gfp_mask));
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}
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#ifdef CONFIG_NUMA
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extern struct page *alloc_pages_current(gfp_t gfp_mask, unsigned order);
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static inline struct page *
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alloc_pages(gfp_t gfp_mask, unsigned int order)
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{
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return alloc_pages_current(gfp_mask, order);
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}
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extern struct page *alloc_page_vma(gfp_t gfp_mask,
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struct vm_area_struct *vma, unsigned long addr);
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#else
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#define alloc_pages(gfp_mask, order) \
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alloc_pages_node(numa_node_id(), gfp_mask, order)
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#define alloc_page_vma(gfp_mask, vma, addr) alloc_pages(gfp_mask, 0)
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#endif
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#define alloc_page(gfp_mask) alloc_pages(gfp_mask, 0)
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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);
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void free_pages_exact(void *virt, size_t size);
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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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extern void free_hot_page(struct page *page);
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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(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(void);
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void drain_local_pages(void *dummy);
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extern gfp_t gfp_allowed_mask;
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static inline void set_gfp_allowed_mask(gfp_t mask)
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{
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gfp_allowed_mask = mask;
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}
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#endif /* __LINUX_GFP_H */
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