240 lines
9.1 KiB
C
240 lines
9.1 KiB
C
#ifndef __LINUX_GFP_H
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#define __LINUX_GFP_H
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#include <linux/mmdebug.h>
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#include <linux/types.h>
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#include <linux/stddef.h>
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#include <linux/linkage.h>
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struct vm_area_struct;
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/* Plain integer GFP bitmasks. Do not use this directly. */
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#define ___GFP_DMA 0x01u
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#define ___GFP_HIGHMEM 0x02u
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#define ___GFP_DMA32 0x04u
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#define ___GFP_MOVABLE 0x08u
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#define ___GFP_WAIT 0x10u
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#define ___GFP_HIGH 0x20u
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#define ___GFP_IO 0x40u
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#define ___GFP_FS 0x80u
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#define ___GFP_COLD 0x100u
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#define ___GFP_NOWARN 0x200u
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#define ___GFP_REPEAT 0x400u
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#define ___GFP_NOFAIL 0x800u
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#define ___GFP_NORETRY 0x1000u
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#define ___GFP_MEMALLOC 0x2000u
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#define ___GFP_COMP 0x4000u
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#define ___GFP_ZERO 0x8000u
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#define ___GFP_NOMEMALLOC 0x10000u
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#define ___GFP_HARDWALL 0x20000u
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#define ___GFP_THISNODE 0x40000u
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#define ___GFP_RECLAIMABLE 0x80000u
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#define ___GFP_NOTRACK 0x200000u
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#define ___GFP_NO_KSWAPD 0x400000u
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#define ___GFP_OTHER_NODE 0x800000u
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#define ___GFP_WRITE 0x1000000u
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/* If the above are modified, __GFP_BITS_SHIFT may need updating */
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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 them 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)___GFP_DMA)
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#define __GFP_HIGHMEM ((__force gfp_t)___GFP_HIGHMEM)
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#define __GFP_DMA32 ((__force gfp_t)___GFP_DMA32)
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#define __GFP_MOVABLE ((__force gfp_t)___GFP_MOVABLE) /* 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. This modifier is deprecated and no new
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* users should be added.
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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)___GFP_WAIT) /* Can wait and reschedule? */
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#define __GFP_HIGH ((__force gfp_t)___GFP_HIGH) /* Should access emergency pools? */
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#define __GFP_IO ((__force gfp_t)___GFP_IO) /* Can start physical IO? */
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#define __GFP_FS ((__force gfp_t)___GFP_FS) /* Can call down to low-level FS? */
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#define __GFP_COLD ((__force gfp_t)___GFP_COLD) /* Cache-cold page required */
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#define __GFP_NOWARN ((__force gfp_t)___GFP_NOWARN) /* Suppress page allocation failure warning */
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#define __GFP_REPEAT ((__force gfp_t)___GFP_REPEAT) /* See above */
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#define __GFP_NOFAIL ((__force gfp_t)___GFP_NOFAIL) /* See above */
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#define __GFP_NORETRY ((__force gfp_t)___GFP_NORETRY) /* See above */
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#define __GFP_MEMALLOC ((__force gfp_t)___GFP_MEMALLOC)/* Allow access to emergency reserves */
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#define __GFP_COMP ((__force gfp_t)___GFP_COMP) /* Add compound page metadata */
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#define __GFP_ZERO ((__force gfp_t)___GFP_ZERO) /* Return zeroed page on success */
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#define __GFP_NOMEMALLOC ((__force gfp_t)___GFP_NOMEMALLOC) /* Don't use emergency reserves.
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* This takes precedence over the
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* __GFP_MEMALLOC flag if both are
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* set
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*/
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#define __GFP_HARDWALL ((__force gfp_t)___GFP_HARDWALL) /* Enforce hardwall cpuset memory allocs */
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#define __GFP_THISNODE ((__force gfp_t)___GFP_THISNODE)/* No fallback, no policies */
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#define __GFP_RECLAIMABLE ((__force gfp_t)___GFP_RECLAIMABLE) /* Page is reclaimable */
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#define __GFP_NOTRACK ((__force gfp_t)___GFP_NOTRACK) /* Don't track with kmemcheck */
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#define __GFP_NO_KSWAPD ((__force gfp_t)___GFP_NO_KSWAPD)
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#define __GFP_OTHER_NODE ((__force gfp_t)___GFP_OTHER_NODE) /* On behalf of other node */
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#define __GFP_WRITE ((__force gfp_t)___GFP_WRITE) /* Allocator intends to dirty page */
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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 25 /* Room for N __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_USER | __GFP_HIGHMEM)
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#define GFP_HIGHUSER_MOVABLE (GFP_HIGHUSER | __GFP_MOVABLE)
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#define GFP_IOFS (__GFP_IO | __GFP_FS)
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#define GFP_TRANSHUGE (GFP_HIGHUSER_MOVABLE | __GFP_COMP | \
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__GFP_NOMEMALLOC | __GFP_NORETRY | __GFP_NOWARN | \
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__GFP_NO_KSWAPD)
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/*
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* GFP_THISNODE does not perform any reclaim, you most likely want to
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* use __GFP_THISNODE to allocate from a given node without fallback!
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*/
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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_MEMALLOC|__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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#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 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 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+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 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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#endif /* __LINUX_GFP_H */
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