mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-26 02:39:48 +00:00
![FUJITA Tomonori](/assets/img/avatar_default.png)
Now each architecture has the own dma_get_cache_alignment implementation. dma_get_cache_alignment returns the minimum DMA alignment. Architectures define it as ARCH_KMALLOC_MINALIGN (it's used to make sure that malloc'ed buffer is DMA-safe; the buffer doesn't share a cache with the others). So we can unify dma_get_cache_alignment implementations. This patch: dma_get_cache_alignment() needs to know if an architecture defines ARCH_KMALLOC_MINALIGN or not (needs to know if architecture has DMA alignment restriction). However, slab.h define ARCH_KMALLOC_MINALIGN if architectures doesn't define it. Let's rename ARCH_KMALLOC_MINALIGN to ARCH_DMA_MINALIGN. ARCH_KMALLOC_MINALIGN is used only in the internals of slab/slob/slub (except for crypto). Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp> Cc: <linux-arch@vger.kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
250 lines
6.1 KiB
C
250 lines
6.1 KiB
C
#ifndef _LINUX_SLAB_DEF_H
|
|
#define _LINUX_SLAB_DEF_H
|
|
|
|
/*
|
|
* Definitions unique to the original Linux SLAB allocator.
|
|
*
|
|
* What we provide here is a way to optimize the frequent kmalloc
|
|
* calls in the kernel by selecting the appropriate general cache
|
|
* if kmalloc was called with a size that can be established at
|
|
* compile time.
|
|
*/
|
|
|
|
#include <linux/init.h>
|
|
#include <asm/page.h> /* kmalloc_sizes.h needs PAGE_SIZE */
|
|
#include <asm/cache.h> /* kmalloc_sizes.h needs L1_CACHE_BYTES */
|
|
#include <linux/compiler.h>
|
|
|
|
#include <trace/events/kmem.h>
|
|
|
|
/*
|
|
* Enforce a minimum alignment for the kmalloc caches.
|
|
* Usually, the kmalloc caches are cache_line_size() aligned, except when
|
|
* DEBUG and FORCED_DEBUG are enabled, then they are BYTES_PER_WORD aligned.
|
|
* Some archs want to perform DMA into kmalloc caches and need a guaranteed
|
|
* alignment larger than the alignment of a 64-bit integer.
|
|
* ARCH_KMALLOC_MINALIGN allows that.
|
|
* Note that increasing this value may disable some debug features.
|
|
*/
|
|
#ifdef ARCH_DMA_MINALIGN
|
|
#define ARCH_KMALLOC_MINALIGN ARCH_DMA_MINALIGN
|
|
#else
|
|
#define ARCH_KMALLOC_MINALIGN __alignof__(unsigned long long)
|
|
#endif
|
|
|
|
#ifndef ARCH_SLAB_MINALIGN
|
|
/*
|
|
* Enforce a minimum alignment for all caches.
|
|
* Intended for archs that get misalignment faults even for BYTES_PER_WORD
|
|
* aligned buffers. Includes ARCH_KMALLOC_MINALIGN.
|
|
* If possible: Do not enable this flag for CONFIG_DEBUG_SLAB, it disables
|
|
* some debug features.
|
|
*/
|
|
#define ARCH_SLAB_MINALIGN 0
|
|
#endif
|
|
|
|
/*
|
|
* struct kmem_cache
|
|
*
|
|
* manages a cache.
|
|
*/
|
|
|
|
struct kmem_cache {
|
|
/* 1) per-cpu data, touched during every alloc/free */
|
|
struct array_cache *array[NR_CPUS];
|
|
/* 2) Cache tunables. Protected by cache_chain_mutex */
|
|
unsigned int batchcount;
|
|
unsigned int limit;
|
|
unsigned int shared;
|
|
|
|
unsigned int buffer_size;
|
|
u32 reciprocal_buffer_size;
|
|
/* 3) touched by every alloc & free from the backend */
|
|
|
|
unsigned int flags; /* constant flags */
|
|
unsigned int num; /* # of objs per slab */
|
|
|
|
/* 4) cache_grow/shrink */
|
|
/* order of pgs per slab (2^n) */
|
|
unsigned int gfporder;
|
|
|
|
/* force GFP flags, e.g. GFP_DMA */
|
|
gfp_t gfpflags;
|
|
|
|
size_t colour; /* cache colouring range */
|
|
unsigned int colour_off; /* colour offset */
|
|
struct kmem_cache *slabp_cache;
|
|
unsigned int slab_size;
|
|
unsigned int dflags; /* dynamic flags */
|
|
|
|
/* constructor func */
|
|
void (*ctor)(void *obj);
|
|
|
|
/* 5) cache creation/removal */
|
|
const char *name;
|
|
struct list_head next;
|
|
|
|
/* 6) statistics */
|
|
#ifdef CONFIG_DEBUG_SLAB
|
|
unsigned long num_active;
|
|
unsigned long num_allocations;
|
|
unsigned long high_mark;
|
|
unsigned long grown;
|
|
unsigned long reaped;
|
|
unsigned long errors;
|
|
unsigned long max_freeable;
|
|
unsigned long node_allocs;
|
|
unsigned long node_frees;
|
|
unsigned long node_overflow;
|
|
atomic_t allochit;
|
|
atomic_t allocmiss;
|
|
atomic_t freehit;
|
|
atomic_t freemiss;
|
|
|
|
/*
|
|
* If debugging is enabled, then the allocator can add additional
|
|
* fields and/or padding to every object. buffer_size contains the total
|
|
* object size including these internal fields, the following two
|
|
* variables contain the offset to the user object and its size.
|
|
*/
|
|
int obj_offset;
|
|
int obj_size;
|
|
#endif /* CONFIG_DEBUG_SLAB */
|
|
|
|
/*
|
|
* We put nodelists[] at the end of kmem_cache, because we want to size
|
|
* this array to nr_node_ids slots instead of MAX_NUMNODES
|
|
* (see kmem_cache_init())
|
|
* We still use [MAX_NUMNODES] and not [1] or [0] because cache_cache
|
|
* is statically defined, so we reserve the max number of nodes.
|
|
*/
|
|
struct kmem_list3 *nodelists[MAX_NUMNODES];
|
|
/*
|
|
* Do not add fields after nodelists[]
|
|
*/
|
|
};
|
|
|
|
/* Size description struct for general caches. */
|
|
struct cache_sizes {
|
|
size_t cs_size;
|
|
struct kmem_cache *cs_cachep;
|
|
#ifdef CONFIG_ZONE_DMA
|
|
struct kmem_cache *cs_dmacachep;
|
|
#endif
|
|
};
|
|
extern struct cache_sizes malloc_sizes[];
|
|
|
|
void *kmem_cache_alloc(struct kmem_cache *, gfp_t);
|
|
void *__kmalloc(size_t size, gfp_t flags);
|
|
|
|
#ifdef CONFIG_TRACING
|
|
extern void *kmem_cache_alloc_notrace(struct kmem_cache *cachep, gfp_t flags);
|
|
extern size_t slab_buffer_size(struct kmem_cache *cachep);
|
|
#else
|
|
static __always_inline void *
|
|
kmem_cache_alloc_notrace(struct kmem_cache *cachep, gfp_t flags)
|
|
{
|
|
return kmem_cache_alloc(cachep, flags);
|
|
}
|
|
static inline size_t slab_buffer_size(struct kmem_cache *cachep)
|
|
{
|
|
return 0;
|
|
}
|
|
#endif
|
|
|
|
static __always_inline void *kmalloc(size_t size, gfp_t flags)
|
|
{
|
|
struct kmem_cache *cachep;
|
|
void *ret;
|
|
|
|
if (__builtin_constant_p(size)) {
|
|
int i = 0;
|
|
|
|
if (!size)
|
|
return ZERO_SIZE_PTR;
|
|
|
|
#define CACHE(x) \
|
|
if (size <= x) \
|
|
goto found; \
|
|
else \
|
|
i++;
|
|
#include <linux/kmalloc_sizes.h>
|
|
#undef CACHE
|
|
return NULL;
|
|
found:
|
|
#ifdef CONFIG_ZONE_DMA
|
|
if (flags & GFP_DMA)
|
|
cachep = malloc_sizes[i].cs_dmacachep;
|
|
else
|
|
#endif
|
|
cachep = malloc_sizes[i].cs_cachep;
|
|
|
|
ret = kmem_cache_alloc_notrace(cachep, flags);
|
|
|
|
trace_kmalloc(_THIS_IP_, ret,
|
|
size, slab_buffer_size(cachep), flags);
|
|
|
|
return ret;
|
|
}
|
|
return __kmalloc(size, flags);
|
|
}
|
|
|
|
#ifdef CONFIG_NUMA
|
|
extern void *__kmalloc_node(size_t size, gfp_t flags, int node);
|
|
extern void *kmem_cache_alloc_node(struct kmem_cache *, gfp_t flags, int node);
|
|
|
|
#ifdef CONFIG_TRACING
|
|
extern void *kmem_cache_alloc_node_notrace(struct kmem_cache *cachep,
|
|
gfp_t flags,
|
|
int nodeid);
|
|
#else
|
|
static __always_inline void *
|
|
kmem_cache_alloc_node_notrace(struct kmem_cache *cachep,
|
|
gfp_t flags,
|
|
int nodeid)
|
|
{
|
|
return kmem_cache_alloc_node(cachep, flags, nodeid);
|
|
}
|
|
#endif
|
|
|
|
static __always_inline void *kmalloc_node(size_t size, gfp_t flags, int node)
|
|
{
|
|
struct kmem_cache *cachep;
|
|
void *ret;
|
|
|
|
if (__builtin_constant_p(size)) {
|
|
int i = 0;
|
|
|
|
if (!size)
|
|
return ZERO_SIZE_PTR;
|
|
|
|
#define CACHE(x) \
|
|
if (size <= x) \
|
|
goto found; \
|
|
else \
|
|
i++;
|
|
#include <linux/kmalloc_sizes.h>
|
|
#undef CACHE
|
|
return NULL;
|
|
found:
|
|
#ifdef CONFIG_ZONE_DMA
|
|
if (flags & GFP_DMA)
|
|
cachep = malloc_sizes[i].cs_dmacachep;
|
|
else
|
|
#endif
|
|
cachep = malloc_sizes[i].cs_cachep;
|
|
|
|
ret = kmem_cache_alloc_node_notrace(cachep, flags, node);
|
|
|
|
trace_kmalloc_node(_THIS_IP_, ret,
|
|
size, slab_buffer_size(cachep),
|
|
flags, node);
|
|
|
|
return ret;
|
|
}
|
|
return __kmalloc_node(size, flags, node);
|
|
}
|
|
|
|
#endif /* CONFIG_NUMA */
|
|
|
|
#endif /* _LINUX_SLAB_DEF_H */
|