/*****************************************************************************\ * Copyright (C) 2007-2010 Lawrence Livermore National Security, LLC. * Copyright (C) 2007 The Regents of the University of California. * Produced at Lawrence Livermore National Laboratory (cf, DISCLAIMER). * Written by Brian Behlendorf . * UCRL-CODE-235197 * * This file is part of the SPL, Solaris Porting Layer. * For details, see . * * The SPL 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. * * The SPL 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 the SPL. If not, see . \*****************************************************************************/ #ifndef _SPL_KMEM_H #define _SPL_KMEM_H #include #include #include #include #include #include #include #include #include #include #include #include /* * 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 #define KM_NODEBUG __GFP_NOWARN /* * 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 */ /* * 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 extern int kmem_debugging(void); extern char *kmem_asprintf(const char *fmt, ...); #define strfree(str) kfree(str) #define strdup(str) kstrdup(str, GFP_KERNEL) 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)) #endif /* _SPL_KMEM_H */