[mirror_spl-debian.git] / include / sys / kmem.h

/*
 *  This file is part of the SPL: Solaris Porting Layer.
 *
 *  Copyright (c) 2008 Lawrence Livermore National Security, LLC.
 *  Produced at Lawrence Livermore National Laboratory
 *  Written by:
 *          Brian Behlendorf <behlendorf1@llnl.gov>,
 *          Herb Wartens <wartens2@llnl.gov>,
 *          Jim Garlick <garlick@llnl.gov>
 *  UCRL-CODE-235197
 *
 *  This is free software; you can redistribute it and/or modify it
 *  under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2 of the License, or
 *  (at your option) any later version.
 *
 *  This is distributed in the hope that it will be useful, but WITHOUT
 *  ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 *  FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 *  for more details.
 *
 *  You should have received a copy of the GNU General Public License along
 *  with this program; if not, write to the Free Software Foundation, Inc.,
 *  51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA.
 */

#ifndef _SPL_KMEM_H
#define	_SPL_KMEM_H

#ifdef	__cplusplus
extern "C" {
#endif

#undef DEBUG_KMEM_UNIMPLEMENTED

#include <linux/module.h>
#include <linux/slab.h>
#include <linux/vmalloc.h>
#include <linux/mm_compat.h>
#include <linux/spinlock.h>
#include <linux/rwsem.h>
#include <linux/hash.h>
#include <linux/ctype.h>
#include <asm/atomic.h>
#include <sys/types.h>
#include <sys/debug.h>
#include <sys/vmsystm.h>

/*
 * Memory allocation interfaces
 */
#define KM_SLEEP                        GFP_KERNEL
#define KM_NOSLEEP                      GFP_ATOMIC
#undef  KM_PANIC                        /* No linux analog */
#define KM_PUSHPAGE                     (KM_SLEEP | __GFP_HIGH)
#define KM_VMFLAGS                      GFP_LEVEL_MASK
#define KM_FLAGS                        __GFP_BITS_MASK

/*
 * Used internally, the kernel does not need to support this flag
 */
#ifndef __GFP_ZERO
# define __GFP_ZERO                     0x8000
#endif

/*
 * __GFP_NOFAIL looks like it will be removed from the kernel perhaps as
 * early as 2.6.32.  To avoid this issue when it occurs in upstream kernels
 * we retry the allocation here as long as it is not __GFP_WAIT (GFP_ATOMIC).
 * I would prefer the caller handle the failure case cleanly but we are
 * trying to emulate Solaris and those are not the Solaris semantics.
 */
static inline void *
kmalloc_nofail(size_t size, gfp_t flags)
{
	void *ptr;

	do {
		ptr = kmalloc(size, flags);
	} while (ptr == NULL && (flags & __GFP_WAIT));

	return ptr;
}

static inline void *
kzalloc_nofail(size_t size, gfp_t flags)
{
	void *ptr;

	do {
		ptr = kzalloc(size, flags);
	} while (ptr == NULL && (flags & __GFP_WAIT));

	return ptr;
}

#ifdef HAVE_KMALLOC_NODE
static inline void *
kmalloc_node_nofail(size_t size, gfp_t flags, int node)
{
	void *ptr;

	do {
		ptr = kmalloc_node(size, flags, node);
	} while (ptr == NULL && (flags & __GFP_WAIT));

	return ptr;
}
#endif /* HAVE_KMALLOC_NODE */

#ifdef DEBUG_KMEM
# ifdef HAVE_ATOMIC64_T

extern atomic64_t kmem_alloc_used;
extern unsigned long long kmem_alloc_max;
extern atomic64_t vmem_alloc_used;
extern unsigned long long vmem_alloc_max;

# define kmem_alloc_used_add(size)      atomic64_add(size, &kmem_alloc_used)
# define kmem_alloc_used_sub(size)      atomic64_sub(size, &kmem_alloc_used)
# define kmem_alloc_used_read()         atomic64_read(&kmem_alloc_used)
# define kmem_alloc_used_set(size)      atomic64_set(&kmem_alloc_used, size)
# define vmem_alloc_used_add(size)      atomic64_add(size, &vmem_alloc_used)
# define vmem_alloc_used_sub(size)      atomic64_sub(size, &vmem_alloc_used)
# define vmem_alloc_used_read()         atomic64_read(&vmem_alloc_used)
# define vmem_alloc_used_set(size)      atomic64_set(&vmem_alloc_used, size)

# else

extern atomic_t kmem_alloc_used;
extern unsigned long long kmem_alloc_max;
extern atomic_t vmem_alloc_used;
extern unsigned long long vmem_alloc_max;

# define kmem_alloc_used_add(size)      atomic_add(size, &kmem_alloc_used)
# define kmem_alloc_used_sub(size)      atomic_sub(size, &kmem_alloc_used)
# define kmem_alloc_used_read()         atomic_read(&kmem_alloc_used)
# define kmem_alloc_used_set(size)      atomic_set(&kmem_alloc_used, size)
# define vmem_alloc_used_add(size)      atomic_add(size, &vmem_alloc_used)
# define vmem_alloc_used_sub(size)      atomic_sub(size, &vmem_alloc_used)
# define vmem_alloc_used_read()         atomic_read(&vmem_alloc_used)
# define vmem_alloc_used_set(size)      atomic_set(&vmem_alloc_used, size)

# endif /* _LP64 */

# define kmem_alloc(size, flags)             __kmem_alloc((size), (flags), 0, 0)
# define kmem_zalloc(size, flags)            __kmem_alloc((size), ((flags) |  \
                                                 __GFP_ZERO), 0, 0)

/* The node alloc functions are only used by the SPL code itself */
# ifdef HAVE_KMALLOC_NODE
#  define kmem_alloc_node(size, flags, node) __kmem_alloc((size), (flags), 1, \
                                                 node)
# else
#  define kmem_alloc_node(size, flags, node) __kmem_alloc((size), (flags), 0, 0)
# endif

# define vmem_zalloc(size, flags)            vmem_alloc((size), ((flags) |    \
                                                 __GFP_ZERO))

# ifdef DEBUG_KMEM_TRACKING

extern void *kmem_alloc_track(size_t size, int flags, const char *func,
    int line, int node_alloc, int node);
extern void kmem_free_track(void *ptr, size_t size);
extern void *vmem_alloc_track(size_t size, int flags, const char *func,
    int line);
extern void vmem_free_track(void *ptr, size_t size);

#  define __kmem_alloc(size, flags, na, node) kmem_alloc_track((size),        \
                                                  (flags), __FUNCTION__,      \
                                                  __LINE__, (na), (node))
#  define kmem_free(ptr, size)                kmem_free_track((ptr), (size))
#  define vmem_alloc(size, flags)             vmem_alloc_track((size),        \
                                                  (flags),__FUNCTION__,       \
                                                  __LINE__)
#  define vmem_free(ptr, size)                vmem_free_track((ptr), (size))

# else /* DEBUG_KMEM_TRACKING */

extern void *kmem_alloc_debug(size_t size, int flags, const char *func,
    int line, int node_alloc, int node);
extern void kmem_free_debug(void *ptr, size_t size);
extern void *vmem_alloc_debug(size_t size, int flags, const char *func,
    int line);
extern void vmem_free_debug(void *ptr, size_t size);

#  define __kmem_alloc(size, flags, na, node) kmem_alloc_debug((size),        \
                                                  (flags), __FUNCTION__,      \
                                                  __LINE__, (na), (node))
#  define kmem_free(ptr, size)                kmem_free_debug((ptr), (size))
#  define vmem_alloc(size, flags)             vmem_alloc_debug((size),        \
                                                  (flags), __FUNCTION__,      \
                                                  __LINE__)
#  define vmem_free(ptr, size)                vmem_free_debug((ptr), (size))

# endif /* DEBUG_KMEM_TRACKING */

#else /* DEBUG_KMEM */

# define kmem_alloc(size, flags)              kmalloc_nofail((size), (flags))
# define kmem_zalloc(size, flags)             kzalloc_nofail((size), (flags))
# define kmem_free(ptr, size)                 ((void)(size), kfree(ptr))

# ifdef HAVE_KMALLOC_NODE
#  define kmem_alloc_node(size, flags, node)                                  \
          kmalloc_node_nofail((size), (flags), (node))
# else
#  define kmem_alloc_node(size, flags, node)                                  \
          kmalloc_nofail((size), (flags))
# endif

# define vmem_alloc(size, flags)              __vmalloc((size), ((flags) |    \
                                                  __GFP_HIGHMEM), PAGE_KERNEL)
# define vmem_zalloc(size, flags)                                             \
({                                                                            \
        void *_ptr_ = __vmalloc((size),((flags)|__GFP_HIGHMEM),PAGE_KERNEL);  \
        if (_ptr_)                                                            \
                memset(_ptr_, 0, (size));                                     \
        _ptr_;                                                                \
})
# define vmem_free(ptr, size)           ((void)(size), vfree(ptr))

#endif /* DEBUG_KMEM */

#ifdef DEBUG_KMEM_UNIMPLEMENTED
static __inline__ void *
kmem_alloc_tryhard(size_t size, size_t *alloc_size, int kmflags)
{
#error "kmem_alloc_tryhard() not implemented"
}
#endif /* DEBUG_KMEM_UNIMPLEMENTED */

/*
 * Slab allocation interfaces
 */
enum {
	KMC_BIT_NOTOUCH		= 0,	/* Don't update ages */
	KMC_BIT_NODEBUG		= 1,	/* Default behavior */
	KMC_BIT_NOMAGAZINE	= 2,	/* XXX: Unsupported */
	KMC_BIT_NOHASH		= 3,	/* XXX: Unsupported */
	KMC_BIT_QCACHE		= 4,	/* XXX: Unsupported */
	KMC_BIT_KMEM		= 5,	/* Use kmem cache */
	KMC_BIT_VMEM		= 6,	/* Use vmem cache */
	KMC_BIT_OFFSLAB		= 7,	/* Objects not on slab */
	KMC_BIT_REAPING		= 16,	/* Reaping in progress */
	KMC_BIT_DESTROY		= 17,	/* Destroy in progress */
};

#define KMC_NOTOUCH		(1 << KMC_BIT_NOTOUCH)
#define KMC_NODEBUG		(1 << KMC_BIT_NODEBUG)
#define KMC_NOMAGAZINE		(1 << KMC_BIT_NOMAGAZINE)
#define KMC_NOHASH		(1 << KMC_BIT_NOHASH)
#define KMC_QCACHE		(1 << KMC_BIT_QCACHE)
#define KMC_KMEM		(1 << KMC_BIT_KMEM)
#define KMC_VMEM		(1 << KMC_BIT_VMEM)
#define KMC_OFFSLAB		(1 << KMC_BIT_OFFSLAB)
#define KMC_REAPING		(1 << KMC_BIT_REAPING)
#define KMC_DESTROY		(1 << KMC_BIT_DESTROY)

#define KMC_REAP_CHUNK			INT_MAX
#define KMC_DEFAULT_SEEKS		1

#ifdef DEBUG_KMEM_UNIMPLEMENTED
static __inline__ void kmem_init(void) {
#error "kmem_init() not implemented"
}

static __inline__ void kmem_thread_init(void) {
#error "kmem_thread_init() not implemented"
}

static __inline__ void kmem_mp_init(void) {
#error "kmem_mp_init() not implemented"
}

static __inline__ void kmem_reap_idspace(void) {
#error "kmem_reap_idspace() not implemented"
}

static __inline__ size_t kmem_avail(void) {
#error "kmem_avail() not implemented"
}

static __inline__ size_t kmem_maxavail(void) {
#error "kmem_maxavail() not implemented"
}

static __inline__ uint64_t kmem_cache_stat(spl_kmem_cache_t *cache) {
#error "kmem_cache_stat() not implemented"
}
#endif /* DEBUG_KMEM_UNIMPLEMENTED */

/* XXX - Used by arc.c to adjust its memory footprint. We may want
 *       to use this hook in the future to adjust behavior based on
 *       debug levels.  For now it's safe to always return 0.
 */
static __inline__ int
kmem_debugging(void)
{
        return 0;
}

extern int kmem_set_warning(int flag);

extern struct list_head spl_kmem_cache_list;
extern struct rw_semaphore spl_kmem_cache_sem;

#define SKM_MAGIC			0x2e2e2e2e
#define SKO_MAGIC			0x20202020
#define SKS_MAGIC			0x22222222
#define SKC_MAGIC			0x2c2c2c2c

#define SPL_KMEM_CACHE_DELAY		15	/* Minimum slab release age */
#define SPL_KMEM_CACHE_REAP		0	/* Default reap everything */
#define SPL_KMEM_CACHE_OBJ_PER_SLAB	32	/* Target objects per slab */
#define SPL_KMEM_CACHE_OBJ_PER_SLAB_MIN	8	/* Minimum objects per slab */
#define SPL_KMEM_CACHE_ALIGN		8	/* Default object alignment */

typedef int (*spl_kmem_ctor_t)(void *, void *, int);
typedef void (*spl_kmem_dtor_t)(void *, void *);
typedef void (*spl_kmem_reclaim_t)(void *);

typedef struct spl_kmem_magazine {
	uint32_t		skm_magic;	/* Sanity magic */
	uint32_t		skm_avail;	/* Available objects */
	uint32_t		skm_size;	/* Magazine size */
	uint32_t		skm_refill;	/* Batch refill size */
	struct spl_kmem_cache	*skm_cache;	/* Owned by cache */
	struct delayed_work	skm_work;	/* Magazine reclaim work */
	unsigned long		skm_age;	/* Last cache access */
	void			*skm_objs[0];	/* Object pointers */
} spl_kmem_magazine_t;

typedef struct spl_kmem_obj {
        uint32_t		sko_magic;	/* Sanity magic */
	void			*sko_addr;	/* Buffer address */
	struct spl_kmem_slab	*sko_slab;	/* Owned by slab */
	struct list_head	sko_list;	/* Free object list linkage */
} spl_kmem_obj_t;

typedef struct spl_kmem_slab {
        uint32_t		sks_magic;	/* Sanity magic */
	uint32_t		sks_objs;	/* Objects per slab */
	struct spl_kmem_cache	*sks_cache;	/* Owned by cache */
	struct list_head	sks_list;	/* Slab list linkage */
	struct list_head	sks_free_list;	/* Free object list */
	unsigned long		sks_age;	/* Last modify jiffie */
	uint32_t		sks_ref;	/* Ref count used objects */
} spl_kmem_slab_t;

typedef struct spl_kmem_cache {
	uint32_t		skc_magic;	/* Sanity magic */
	uint32_t		skc_name_size;	/* Name length */
	char			*skc_name;	/* Name string */
	spl_kmem_magazine_t	*skc_mag[NR_CPUS]; /* Per-CPU warm cache */
	uint32_t		skc_mag_size;	/* Magazine size */
	uint32_t		skc_mag_refill;	/* Magazine refill count */
	spl_kmem_ctor_t		skc_ctor;	/* Constructor */
	spl_kmem_dtor_t		skc_dtor;	/* Destructor */
	spl_kmem_reclaim_t	skc_reclaim;	/* Reclaimator */
	void			*skc_private;	/* Private data */
	void			*skc_vmp;	/* Unused */
	unsigned long		skc_flags;	/* Flags */
	uint32_t		skc_obj_size;	/* Object size */
	uint32_t		skc_obj_align;	/* Object alignment */
	uint32_t		skc_slab_objs;	/* Objects per slab */
	uint32_t		skc_slab_size;	/* Slab size */
	uint32_t		skc_delay;	/* Slab reclaim interval */
	uint32_t		skc_reap;	/* Slab reclaim count */
	atomic_t		skc_ref;	/* Ref count callers */
	struct delayed_work	skc_work;	/* Slab reclaim work */
	struct list_head	skc_list;	/* List of caches linkage */
	struct list_head	skc_complete_list;/* Completely alloc'ed */
	struct list_head	skc_partial_list; /* Partially alloc'ed */
	spinlock_t		skc_lock;	/* Cache lock */
	uint64_t		skc_slab_fail;	/* Slab alloc failures */
	uint64_t		skc_slab_create;/* Slab creates */
	uint64_t		skc_slab_destroy;/* Slab destroys */
	uint64_t		skc_slab_total;	/* Slab total current */
	uint64_t		skc_slab_alloc;	/* Slab alloc current */
	uint64_t		skc_slab_max;	/* Slab max historic  */
	uint64_t		skc_obj_total;	/* Obj total current */
	uint64_t		skc_obj_alloc;	/* Obj alloc current */
	uint64_t		skc_obj_max;	/* Obj max historic */
} spl_kmem_cache_t;
#define kmem_cache_t		spl_kmem_cache_t

extern spl_kmem_cache_t *
spl_kmem_cache_create(char *name, size_t size, size_t align,
        spl_kmem_ctor_t ctor, spl_kmem_dtor_t dtor, spl_kmem_reclaim_t reclaim,
        void *priv, void *vmp, int flags);

extern void spl_kmem_cache_destroy(spl_kmem_cache_t *skc);
extern void *spl_kmem_cache_alloc(spl_kmem_cache_t *skc, int flags);
extern void spl_kmem_cache_free(spl_kmem_cache_t *skc, void *obj);
extern void spl_kmem_cache_reap_now(spl_kmem_cache_t *skc);
extern void spl_kmem_reap(void);

int spl_kmem_init_kallsyms_lookup(void);
int spl_kmem_init(void);
void spl_kmem_fini(void);

#define kmem_cache_create(name,size,align,ctor,dtor,rclm,priv,vmp,flags) \
        spl_kmem_cache_create(name,size,align,ctor,dtor,rclm,priv,vmp,flags)
#define kmem_cache_destroy(skc)		spl_kmem_cache_destroy(skc)
#define kmem_cache_alloc(skc, flags)	spl_kmem_cache_alloc(skc, flags)
#define kmem_cache_free(skc, obj)	spl_kmem_cache_free(skc, obj)
#define kmem_cache_reap_now(skc)	spl_kmem_cache_reap_now(skc)
#define kmem_reap()			spl_kmem_reap()
#define kmem_virt(ptr)			(((ptr) >= (void *)VMALLOC_START) && \
					 ((ptr) <  (void *)VMALLOC_END))

#ifdef	__cplusplus
}
#endif

#endif	/* _SPL_KMEM_H */
Commit	Line	Data
715f6251	1	/*
	2	* This file is part of the SPL: Solaris Porting Layer.
	3	*
	4	* Copyright (c) 2008 Lawrence Livermore National Security, LLC.
	5	* Produced at Lawrence Livermore National Laboratory
	6	* Written by:
	7	* Brian Behlendorf <behlendorf1@llnl.gov>,
	8	* Herb Wartens <wartens2@llnl.gov>,
	9	* Jim Garlick <garlick@llnl.gov>
	10	* UCRL-CODE-235197
	11	*
	12	* This is free software; you can redistribute it and/or modify it
	13	* under the terms of the GNU General Public License as published by
	14	* the Free Software Foundation; either version 2 of the License, or
	15	* (at your option) any later version.
	16	*
	17	* This is distributed in the hope that it will be useful, but WITHOUT
	18	* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
	19	* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
	20	* for more details.
	21	*
	22	* You should have received a copy of the GNU General Public License along
	23	* with this program; if not, write to the Free Software Foundation, Inc.,
	24	* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
	25	*/
	26
09b414e8	27	#ifndef _SPL_KMEM_H
09b414e8	28	#define _SPL_KMEM_H
f1ca4da6	29
	30	#ifdef __cplusplus
	31	extern "C" {
	32	#endif
	33
f1ca4da6	34	#undef DEBUG_KMEM_UNIMPLEMENTED
f1ca4da6	35
f1b59d26	36	#include <linux/module.h>
f1ca4da6	37	#include <linux/slab.h>
79b31f36	38	#include <linux/vmalloc.h>
baf2979e	39	#include <linux/mm_compat.h>
f1ca4da6	40	#include <linux/spinlock.h>
d6a26c6a	41	#include <linux/rwsem.h>
	42	#include <linux/hash.h>
	43	#include <linux/ctype.h>
d04c8a56	44	#include <asm/atomic.h>
57d86234	45	#include <sys/types.h>
937879f1	46	#include <sys/debug.h>
36b313da	47	#include <sys/vmsystm.h>
550f1705	48
f1ca4da6	49	/*
	50	* Memory allocation interfaces
	51	*/
c89fdee4	52	#define KM_SLEEP GFP_KERNEL
f1ca4da6	53	#define KM_NOSLEEP GFP_ATOMIC
f1ca4da6	54	#undef KM_PANIC /* No linux analog */
a0f6da3d	55	#define KM_PUSHPAGE (KM_SLEEP \| __GFP_HIGH)
f1ca4da6	56	#define KM_VMFLAGS GFP_LEVEL_MASK
	57	#define KM_FLAGS __GFP_BITS_MASK
	58
3d061e9d	59	/*
	60	* Used internally, the kernel does not need to support this flag
	61	*/
	62	#ifndef __GFP_ZERO
a0f6da3d	63	# define __GFP_ZERO 0x8000
3d061e9d	64	#endif
3d061e9d	65
c89fdee4 BB	66	/*
	67	* __GFP_NOFAIL looks like it will be removed from the kernel perhaps as
	68	* early as 2.6.32. To avoid this issue when it occurs in upstream kernels
	69	* we retry the allocation here as long as it is not __GFP_WAIT (GFP_ATOMIC).
	70	* I would prefer the caller handle the failure case cleanly but we are
	71	* trying to emulate Solaris and those are not the Solaris semantics.
	72	*/
	73	static inline void *
	74	kmalloc_nofail(size_t size, gfp_t flags)
	75	{
	76	void *ptr;
	77
	78	do {
	79	ptr = kmalloc(size, flags);
	80	} while (ptr == NULL && (flags & __GFP_WAIT));
	81
	82	return ptr;
	83	}
	84
	85	static inline void *
	86	kzalloc_nofail(size_t size, gfp_t flags)
	87	{
	88	void *ptr;
	89
	90	do {
	91	ptr = kzalloc(size, flags);
	92	} while (ptr == NULL && (flags & __GFP_WAIT));
	93
	94	return ptr;
	95	}
	96
	97	#ifdef HAVE_KMALLOC_NODE
	98	static inline void *
	99	kmalloc_node_nofail(size_t size, gfp_t flags, int node)
	100	{
	101	void *ptr;
	102
	103	do {
	104	ptr = kmalloc_node(size, flags, node);
	105	} while (ptr == NULL && (flags & __GFP_WAIT));
	106
	107	return ptr;
	108	}
	109	#endif /* HAVE_KMALLOC_NODE */
	110
f1ca4da6	111	#ifdef DEBUG_KMEM
d04c8a56	112	# ifdef HAVE_ATOMIC64_T
a0f6da3d	113
c19c06f3	114	extern atomic64_t kmem_alloc_used;
a0f6da3d	115	extern unsigned long long kmem_alloc_max;
c19c06f3	116	extern atomic64_t vmem_alloc_used;
a0f6da3d	117	extern unsigned long long vmem_alloc_max;
a0f6da3d	118
d04c8a56 BB	119	# define kmem_alloc_used_add(size) atomic64_add(size, &kmem_alloc_used)
	120	# define kmem_alloc_used_sub(size) atomic64_sub(size, &kmem_alloc_used)
	121	# define kmem_alloc_used_read() atomic64_read(&kmem_alloc_used)
	122	# define kmem_alloc_used_set(size) atomic64_set(&kmem_alloc_used, size)
	123	# define vmem_alloc_used_add(size) atomic64_add(size, &vmem_alloc_used)
	124	# define vmem_alloc_used_sub(size) atomic64_sub(size, &vmem_alloc_used)
	125	# define vmem_alloc_used_read() atomic64_read(&vmem_alloc_used)
	126	# define vmem_alloc_used_set(size) atomic64_set(&vmem_alloc_used, size)
	127
	128	# else
	129
	130	extern atomic_t kmem_alloc_used;
	131	extern unsigned long long kmem_alloc_max;
	132	extern atomic_t vmem_alloc_used;
	133	extern unsigned long long vmem_alloc_max;
	134
	135	# define kmem_alloc_used_add(size) atomic_add(size, &kmem_alloc_used)
	136	# define kmem_alloc_used_sub(size) atomic_sub(size, &kmem_alloc_used)
	137	# define kmem_alloc_used_read() atomic_read(&kmem_alloc_used)
	138	# define kmem_alloc_used_set(size) atomic_set(&kmem_alloc_used, size)
	139	# define vmem_alloc_used_add(size) atomic_add(size, &vmem_alloc_used)
	140	# define vmem_alloc_used_sub(size) atomic_sub(size, &vmem_alloc_used)
	141	# define vmem_alloc_used_read() atomic_read(&vmem_alloc_used)
	142	# define vmem_alloc_used_set(size) atomic_set(&vmem_alloc_used, size)
	143
	144	# endif /* _LP64 */
	145
a0f6da3d	146	# define kmem_alloc(size, flags) __kmem_alloc((size), (flags), 0, 0)
	147	# define kmem_zalloc(size, flags) __kmem_alloc((size), ((flags) \| \
	148	__GFP_ZERO), 0, 0)
	149
	150	/* The node alloc functions are only used by the SPL code itself */
	151	# ifdef HAVE_KMALLOC_NODE
	152	# define kmem_alloc_node(size, flags, node) __kmem_alloc((size), (flags), 1, \
	153	node)
	154	# else
	155	# define kmem_alloc_node(size, flags, node) __kmem_alloc((size), (flags), 0, 0)
	156	# endif
	157
	158	# define vmem_zalloc(size, flags) vmem_alloc((size), ((flags) \| \
	159	__GFP_ZERO))
	160
	161	# ifdef DEBUG_KMEM_TRACKING
	162
	163	extern void kmem_alloc_track(size_t size, int flags, const char func,
	164	int line, int node_alloc, int node);
	165	extern void kmem_free_track(void *ptr, size_t size);
	166	extern void vmem_alloc_track(size_t size, int flags, const char func,
	167	int line);
	168	extern void vmem_free_track(void *ptr, size_t size);
	169
	170	# define __kmem_alloc(size, flags, na, node) kmem_alloc_track((size), \
	171	(flags), __FUNCTION__, \
	172	__LINE__, (na), (node))
	173	# define kmem_free(ptr, size) kmem_free_track((ptr), (size))
	174	# define vmem_alloc(size, flags) vmem_alloc_track((size), \
	175	(flags),__FUNCTION__, \
	176	__LINE__)
	177	# define vmem_free(ptr, size) vmem_free_track((ptr), (size))
	178
	179	# else /* DEBUG_KMEM_TRACKING */
	180
	181	extern void kmem_alloc_debug(size_t size, int flags, const char func,
	182	int line, int node_alloc, int node);
	183	extern void kmem_free_debug(void *ptr, size_t size);
	184	extern void vmem_alloc_debug(size_t size, int flags, const char func,
	185	int line);
	186	extern void vmem_free_debug(void *ptr, size_t size);
	187
	188	# define __kmem_alloc(size, flags, na, node) kmem_alloc_debug((size), \
	189	(flags), __FUNCTION__, \
	190	__LINE__, (na), (node))
	191	# define kmem_free(ptr, size) kmem_free_debug((ptr), (size))
	192	# define vmem_alloc(size, flags) vmem_alloc_debug((size), \
	193	(flags), __FUNCTION__, \
	194	__LINE__)
	195	# define vmem_free(ptr, size) vmem_free_debug((ptr), (size))
	196
	197	# endif /* DEBUG_KMEM_TRACKING */
ff449ac4	198
c6dc93d6	199	#else /* DEBUG_KMEM */
f1ca4da6	200
c89fdee4 BB	201	# define kmem_alloc(size, flags) kmalloc_nofail((size), (flags))
c89fdee4 BB	202	# define kmem_zalloc(size, flags) kzalloc_nofail((size), (flags))
a1cf80b4	203	# define kmem_free(ptr, size) ((void)(size), kfree(ptr))
a0f6da3d	204
	205	# ifdef HAVE_KMALLOC_NODE
	206	# define kmem_alloc_node(size, flags, node) \
c89fdee4	207	kmalloc_node_nofail((size), (flags), (node))
a0f6da3d	208	# else
a0f6da3d	209	# define kmem_alloc_node(size, flags, node) \
c89fdee4	210	kmalloc_nofail((size), (flags))
a0f6da3d	211	# endif
a0f6da3d	212
a1cf80b4 BB	213	# define vmem_alloc(size, flags) __vmalloc((size), ((flags) \| \
a1cf80b4 BB	214	__GFP_HIGHMEM), PAGE_KERNEL)
a0f6da3d	215	# define vmem_zalloc(size, flags) \
79b31f36	216	({ \
c6dc93d6	217	void *_ptr_ = __vmalloc((size),((flags)\|__GFP_HIGHMEM),PAGE_KERNEL); \
	218	if (_ptr_) \
	219	memset(_ptr_, 0, (size)); \
	220	_ptr_; \
79b31f36	221	})
bb01879e	222	# define vmem_free(ptr, size) ((void)(size), vfree(ptr))
79b31f36	223
f1ca4da6	224	#endif /* DEBUG_KMEM */
f1ca4da6	225
f1ca4da6	226	#ifdef DEBUG_KMEM_UNIMPLEMENTED
	227	static __inline__ void *
	228	kmem_alloc_tryhard(size_t size, size_t *alloc_size, int kmflags)
	229	{
	230	#error "kmem_alloc_tryhard() not implemented"
	231	}
	232	#endif /* DEBUG_KMEM_UNIMPLEMENTED */
	233
	234	/*
	235	* Slab allocation interfaces
	236	*/
ea3e6ca9 BB	237	enum {
	238	KMC_BIT_NOTOUCH = 0, /* Don't update ages */
	239	KMC_BIT_NODEBUG = 1, /* Default behavior */
	240	KMC_BIT_NOMAGAZINE = 2, /* XXX: Unsupported */
	241	KMC_BIT_NOHASH = 3, /* XXX: Unsupported */
	242	KMC_BIT_QCACHE = 4, /* XXX: Unsupported */
	243	KMC_BIT_KMEM = 5, /* Use kmem cache */
	244	KMC_BIT_VMEM = 6, /* Use vmem cache */
	245	KMC_BIT_OFFSLAB = 7, /* Objects not on slab */
	246	KMC_BIT_REAPING = 16, /* Reaping in progress */
	247	KMC_BIT_DESTROY = 17, /* Destroy in progress */
	248	};
	249
	250	#define KMC_NOTOUCH (1 << KMC_BIT_NOTOUCH)
	251	#define KMC_NODEBUG (1 << KMC_BIT_NODEBUG)
	252	#define KMC_NOMAGAZINE (1 << KMC_BIT_NOMAGAZINE)
	253	#define KMC_NOHASH (1 << KMC_BIT_NOHASH)
	254	#define KMC_QCACHE (1 << KMC_BIT_QCACHE)
	255	#define KMC_KMEM (1 << KMC_BIT_KMEM)
	256	#define KMC_VMEM (1 << KMC_BIT_VMEM)
	257	#define KMC_OFFSLAB (1 << KMC_BIT_OFFSLAB)
	258	#define KMC_REAPING (1 << KMC_BIT_REAPING)
	259	#define KMC_DESTROY (1 << KMC_BIT_DESTROY)
	260
	261	#define KMC_REAP_CHUNK INT_MAX
	262	#define KMC_DEFAULT_SEEKS 1
f1ca4da6	263
f1ca4da6	264	#ifdef DEBUG_KMEM_UNIMPLEMENTED
	265	static __inline__ void kmem_init(void) {
	266	#error "kmem_init() not implemented"
	267	}
	268
	269	static __inline__ void kmem_thread_init(void) {
	270	#error "kmem_thread_init() not implemented"
	271	}
	272
	273	static __inline__ void kmem_mp_init(void) {
	274	#error "kmem_mp_init() not implemented"
	275	}
	276
	277	static __inline__ void kmem_reap_idspace(void) {
	278	#error "kmem_reap_idspace() not implemented"
	279	}
	280
	281	static __inline__ size_t kmem_avail(void) {
	282	#error "kmem_avail() not implemented"
	283	}
	284
	285	static __inline__ size_t kmem_maxavail(void) {
	286	#error "kmem_maxavail() not implemented"
	287	}
	288
2fb9b26a	289	static __inline__ uint64_t kmem_cache_stat(spl_kmem_cache_t *cache) {
f1ca4da6	290	#error "kmem_cache_stat() not implemented"
	291	}
	292	#endif /* DEBUG_KMEM_UNIMPLEMENTED */
	293
	294	/* XXX - Used by arc.c to adjust its memory footprint. We may want
	295	* to use this hook in the future to adjust behavior based on
	296	* debug levels. For now it's safe to always return 0.
	297	*/
	298	static __inline__ int
	299	kmem_debugging(void)
	300	{
	301	return 0;
	302	}
	303
c19c06f3	304	extern int kmem_set_warning(int flag);
c19c06f3	305
ff449ac4	306	extern struct list_head spl_kmem_cache_list;
ff449ac4	307	extern struct rw_semaphore spl_kmem_cache_sem;
2fb9b26a	308
4afaaefa	309	#define SKM_MAGIC 0x2e2e2e2e
2fb9b26a	310	#define SKO_MAGIC 0x20202020
	311	#define SKS_MAGIC 0x22222222
	312	#define SKC_MAGIC 0x2c2c2c2c
	313
37db7d8c BB	314	#define SPL_KMEM_CACHE_DELAY 15 /* Minimum slab release age */
37db7d8c BB	315	#define SPL_KMEM_CACHE_REAP 0 /* Default reap everything */
ea3e6ca9 BB	316	#define SPL_KMEM_CACHE_OBJ_PER_SLAB 32 /* Target objects per slab */
	317	#define SPL_KMEM_CACHE_OBJ_PER_SLAB_MIN 8 /* Minimum objects per slab */
	318	#define SPL_KMEM_CACHE_ALIGN 8 /* Default object alignment */
2fb9b26a	319
	320	typedef int (spl_kmem_ctor_t)(void , void *, int);
	321	typedef void (spl_kmem_dtor_t)(void , void *);
	322	typedef void (spl_kmem_reclaim_t)(void );
	323
4afaaefa	324	typedef struct spl_kmem_magazine {
9b1b8e4c	325	uint32_t skm_magic; /* Sanity magic */
4afaaefa	326	uint32_t skm_avail; /* Available objects */
	327	uint32_t skm_size; /* Magazine size */
	328	uint32_t skm_refill; /* Batch refill size */
9b1b8e4c BB	329	struct spl_kmem_cache skm_cache; / Owned by cache */
9b1b8e4c BB	330	struct delayed_work skm_work; /* Magazine reclaim work */
4afaaefa	331	unsigned long skm_age; /* Last cache access */
	332	void skm_objs[0]; / Object pointers */
	333	} spl_kmem_magazine_t;
	334
2fb9b26a	335	typedef struct spl_kmem_obj {
2fb9b26a	336	uint32_t sko_magic; /* Sanity magic */
2fb9b26a	337	void sko_addr; / Buffer address */
	338	struct spl_kmem_slab sko_slab; / Owned by slab */
	339	struct list_head sko_list; /* Free object list linkage */
2fb9b26a	340	} spl_kmem_obj_t;
	341
	342	typedef struct spl_kmem_slab {
	343	uint32_t sks_magic; /* Sanity magic */
	344	uint32_t sks_objs; /* Objects per slab */
	345	struct spl_kmem_cache sks_cache; / Owned by cache */
	346	struct list_head sks_list; /* Slab list linkage */
	347	struct list_head sks_free_list; /* Free object list */
	348	unsigned long sks_age; /* Last modify jiffie */
4afaaefa	349	uint32_t sks_ref; /* Ref count used objects */
2fb9b26a	350	} spl_kmem_slab_t;
	351
	352	typedef struct spl_kmem_cache {
ea3e6ca9 BB	353	uint32_t skc_magic; /* Sanity magic */
	354	uint32_t skc_name_size; /* Name length */
	355	char skc_name; / Name string */
4afaaefa	356	spl_kmem_magazine_t skc_mag[NR_CPUS]; / Per-CPU warm cache */
	357	uint32_t skc_mag_size; /* Magazine size */
	358	uint32_t skc_mag_refill; /* Magazine refill count */
ea3e6ca9 BB	359	spl_kmem_ctor_t skc_ctor; /* Constructor */
	360	spl_kmem_dtor_t skc_dtor; /* Destructor */
	361	spl_kmem_reclaim_t skc_reclaim; /* Reclaimator */
	362	void skc_private; / Private data */
	363	void skc_vmp; / Unused */
31a033ec	364	unsigned long skc_flags; /* Flags */
2fb9b26a	365	uint32_t skc_obj_size; /* Object size */
48e0606a	366	uint32_t skc_obj_align; /* Object alignment */
a1502d76	367	uint32_t skc_slab_objs; /* Objects per slab */
ea3e6ca9 BB	368	uint32_t skc_slab_size; /* Slab size */
ea3e6ca9 BB	369	uint32_t skc_delay; /* Slab reclaim interval */
37db7d8c	370	uint32_t skc_reap; /* Slab reclaim count */
ea3e6ca9 BB	371	atomic_t skc_ref; /* Ref count callers */
ea3e6ca9 BB	372	struct delayed_work skc_work; /* Slab reclaim work */
ea3e6ca9	373	struct list_head skc_list; /* List of caches linkage */
2fb9b26a	374	struct list_head skc_complete_list;/* Completely alloc'ed */
2fb9b26a	375	struct list_head skc_partial_list; /* Partially alloc'ed */
d46630e0	376	spinlock_t skc_lock; /* Cache lock */
2fb9b26a	377	uint64_t skc_slab_fail; /* Slab alloc failures */
	378	uint64_t skc_slab_create;/* Slab creates */
	379	uint64_t skc_slab_destroy;/* Slab destroys */
d46630e0	380	uint64_t skc_slab_total; /* Slab total current */
ea3e6ca9	381	uint64_t skc_slab_alloc; /* Slab alloc current */
d46630e0	382	uint64_t skc_slab_max; /* Slab max historic */
	383	uint64_t skc_obj_total; /* Obj total current */
	384	uint64_t skc_obj_alloc; /* Obj alloc current */
	385	uint64_t skc_obj_max; /* Obj max historic */
2fb9b26a	386	} spl_kmem_cache_t;
7afde631	387	#define kmem_cache_t spl_kmem_cache_t
2fb9b26a	388
	389	extern spl_kmem_cache_t *
	390	spl_kmem_cache_create(char *name, size_t size, size_t align,
	391	spl_kmem_ctor_t ctor, spl_kmem_dtor_t dtor, spl_kmem_reclaim_t reclaim,
f1ca4da6	392	void priv, void vmp, int flags);
f1ca4da6	393
2fb9b26a	394	extern void spl_kmem_cache_destroy(spl_kmem_cache_t *skc);
	395	extern void spl_kmem_cache_alloc(spl_kmem_cache_t skc, int flags);
	396	extern void spl_kmem_cache_free(spl_kmem_cache_t skc, void obj);
	397	extern void spl_kmem_cache_reap_now(spl_kmem_cache_t *skc);
	398	extern void spl_kmem_reap(void);
f1ca4da6	399
d1ff2312	400	int spl_kmem_init_kallsyms_lookup(void);
2fb9b26a	401	int spl_kmem_init(void);
2fb9b26a	402	void spl_kmem_fini(void);
5d86345d	403
f1ca4da6	404	#define kmem_cache_create(name,size,align,ctor,dtor,rclm,priv,vmp,flags) \
2fb9b26a	405	spl_kmem_cache_create(name,size,align,ctor,dtor,rclm,priv,vmp,flags)
	406	#define kmem_cache_destroy(skc) spl_kmem_cache_destroy(skc)
	407	#define kmem_cache_alloc(skc, flags) spl_kmem_cache_alloc(skc, flags)
	408	#define kmem_cache_free(skc, obj) spl_kmem_cache_free(skc, obj)
	409	#define kmem_cache_reap_now(skc) spl_kmem_cache_reap_now(skc)
	410	#define kmem_reap() spl_kmem_reap()
a1502d76	411	#define kmem_virt(ptr) (((ptr) >= (void *)VMALLOC_START) && \
a1502d76	412	((ptr) < (void *)VMALLOC_END))
f1ca4da6	413
	414	#ifdef __cplusplus
	415	}
	416	#endif
	417
09b414e8	418	#endif /* _SPL_KMEM_H */