418 строки
15 KiB
C
418 строки
15 KiB
C
#ifndef __LINUX_GFP_H
|
|
#define __LINUX_GFP_H
|
|
|
|
#include <linux/mmzone.h>
|
|
#include <linux/stddef.h>
|
|
#include <linux/linkage.h>
|
|
#include <linux/topology.h>
|
|
#include <linux/mmdebug.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_WAIT 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_RECLAIMABLE 0x80000u
|
|
#define ___GFP_KMEMCG 0x100000u
|
|
#define ___GFP_NOTRACK 0x200000u
|
|
#define ___GFP_NO_KSWAPD 0x400000u
|
|
#define ___GFP_OTHER_NODE 0x800000u
|
|
#define ___GFP_WRITE 0x1000000u
|
|
/* 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. This modifier is deprecated and no new
|
|
* users should be added.
|
|
*
|
|
* __GFP_NORETRY: The VM implementation must not retry indefinitely.
|
|
*
|
|
* __GFP_MOVABLE: Flag that this page will be movable by the page migration
|
|
* mechanism or reclaimed
|
|
*/
|
|
#define __GFP_WAIT ((__force gfp_t)___GFP_WAIT) /* Can wait and 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_NOTRACK ((__force gfp_t)___GFP_NOTRACK) /* Don't track with kmemcheck */
|
|
|
|
#define __GFP_NO_KSWAPD ((__force gfp_t)___GFP_NO_KSWAPD)
|
|
#define __GFP_OTHER_NODE ((__force gfp_t)___GFP_OTHER_NODE) /* On behalf of other node */
|
|
#define __GFP_KMEMCG ((__force gfp_t)___GFP_KMEMCG) /* Allocation comes from a memcg-accounted resource */
|
|
#define __GFP_WRITE ((__force gfp_t)___GFP_WRITE) /* Allocator intends to dirty page */
|
|
|
|
/*
|
|
* 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 25 /* Room for N __GFP_FOO bits */
|
|
#define __GFP_BITS_MASK ((__force gfp_t)((1 << __GFP_BITS_SHIFT) - 1))
|
|
|
|
/* This equals 0, but use constants in case they ever change */
|
|
#define GFP_NOWAIT (GFP_ATOMIC & ~__GFP_HIGH)
|
|
/* GFP_ATOMIC means both !wait (__GFP_WAIT not set) and use emergency pool */
|
|
#define GFP_ATOMIC (__GFP_HIGH)
|
|
#define GFP_NOIO (__GFP_WAIT)
|
|
#define GFP_NOFS (__GFP_WAIT | __GFP_IO)
|
|
#define GFP_KERNEL (__GFP_WAIT | __GFP_IO | __GFP_FS)
|
|
#define GFP_TEMPORARY (__GFP_WAIT | __GFP_IO | __GFP_FS | \
|
|
__GFP_RECLAIMABLE)
|
|
#define GFP_USER (__GFP_WAIT | __GFP_IO | __GFP_FS | __GFP_HARDWALL)
|
|
#define GFP_HIGHUSER (__GFP_WAIT | __GFP_IO | __GFP_FS | __GFP_HARDWALL | \
|
|
__GFP_HIGHMEM)
|
|
#define GFP_HIGHUSER_MOVABLE (__GFP_WAIT | __GFP_IO | __GFP_FS | \
|
|
__GFP_HARDWALL | __GFP_HIGHMEM | \
|
|
__GFP_MOVABLE)
|
|
#define GFP_IOFS (__GFP_IO | __GFP_FS)
|
|
#define GFP_TRANSHUGE (GFP_HIGHUSER_MOVABLE | __GFP_COMP | \
|
|
__GFP_NOMEMALLOC | __GFP_NORETRY | __GFP_NOWARN | \
|
|
__GFP_NO_KSWAPD)
|
|
|
|
#ifdef CONFIG_NUMA
|
|
#define GFP_THISNODE (__GFP_THISNODE | __GFP_NOWARN | __GFP_NORETRY)
|
|
#else
|
|
#define GFP_THISNODE ((__force gfp_t)0)
|
|
#endif
|
|
|
|
/* This mask makes up all the page movable related flags */
|
|
#define GFP_MOVABLE_MASK (__GFP_RECLAIMABLE|__GFP_MOVABLE)
|
|
|
|
/* Control page allocator reclaim behavior */
|
|
#define GFP_RECLAIM_MASK (__GFP_WAIT|__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_WAIT|__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 allocflags_to_migratetype(gfp_t gfp_flags)
|
|
{
|
|
WARN_ON((gfp_flags & GFP_MOVABLE_MASK) == GFP_MOVABLE_MASK);
|
|
|
|
if (unlikely(page_group_by_mobility_disabled))
|
|
return MIGRATE_UNMOVABLE;
|
|
|
|
/* Group based on mobility */
|
|
return (((gfp_flags & __GFP_MOVABLE) != 0) << 1) |
|
|
((gfp_flags & __GFP_RECLAIMABLE) != 0);
|
|
}
|
|
|
|
#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+HIGHMEM+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);
|
|
}
|
|
|
|
static inline struct page *alloc_pages_node(int nid, gfp_t gfp_mask,
|
|
unsigned int order)
|
|
{
|
|
/* Unknown node is current node */
|
|
if (nid < 0)
|
|
nid = numa_node_id();
|
|
|
|
return __alloc_pages(gfp_mask, order, node_zonelist(nid, gfp_mask));
|
|
}
|
|
|
|
static inline struct page *alloc_pages_exact_node(int nid, gfp_t gfp_mask,
|
|
unsigned int order)
|
|
{
|
|
VM_BUG_ON(nid < 0 || nid >= MAX_NUMNODES || !node_online(nid));
|
|
|
|
return __alloc_pages(gfp_mask, order, node_zonelist(nid, gfp_mask));
|
|
}
|
|
|
|
#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);
|
|
#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) \
|
|
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())
|
|
#define alloc_page_vma_node(gfp_mask, vma, addr, node) \
|
|
alloc_pages_vma(gfp_mask, 0, vma, addr, node)
|
|
|
|
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);
|
|
/* This is different from alloc_pages_exact_node !!! */
|
|
void *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, int cold);
|
|
extern void free_hot_cold_page_list(struct list_head *list, int cold);
|
|
|
|
extern void __free_memcg_kmem_pages(struct page *page, unsigned int order);
|
|
extern void free_memcg_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(void);
|
|
void drain_local_pages(void *dummy);
|
|
|
|
/*
|
|
* 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 */
|