1b2441318SGreg Kroah-Hartman /* SPDX-License-Identifier: GPL-2.0 */ 297d06609SChristoph Lameter #ifndef MM_SLAB_H 397d06609SChristoph Lameter #define MM_SLAB_H 497d06609SChristoph Lameter /* 597d06609SChristoph Lameter * Internal slab definitions 697d06609SChristoph Lameter */ 797d06609SChristoph Lameter 8d122019bSMatthew Wilcox (Oracle) /* Reuses the bits in struct page */ 9d122019bSMatthew Wilcox (Oracle) struct slab { 10d122019bSMatthew Wilcox (Oracle) unsigned long __page_flags; 11401fb12cSVlastimil Babka 12401fb12cSVlastimil Babka #if defined(CONFIG_SLAB) 13401fb12cSVlastimil Babka 14d122019bSMatthew Wilcox (Oracle) union { 15d122019bSMatthew Wilcox (Oracle) struct list_head slab_list; 16401fb12cSVlastimil Babka struct rcu_head rcu_head; 17401fb12cSVlastimil Babka }; 18401fb12cSVlastimil Babka struct kmem_cache *slab_cache; 19401fb12cSVlastimil Babka void *freelist; /* array of free object indexes */ 20401fb12cSVlastimil Babka void *s_mem; /* first object */ 21401fb12cSVlastimil Babka unsigned int active; 22401fb12cSVlastimil Babka 23401fb12cSVlastimil Babka #elif defined(CONFIG_SLUB) 24401fb12cSVlastimil Babka 25401fb12cSVlastimil Babka union { 26401fb12cSVlastimil Babka struct list_head slab_list; 27401fb12cSVlastimil Babka struct rcu_head rcu_head; 28*9c01e9afSVlastimil Babka #ifdef CONFIG_SLUB_CPU_PARTIAL 29401fb12cSVlastimil Babka struct { 30d122019bSMatthew Wilcox (Oracle) struct slab *next; 31d122019bSMatthew Wilcox (Oracle) int slabs; /* Nr of slabs left */ 32d122019bSMatthew Wilcox (Oracle) }; 33*9c01e9afSVlastimil Babka #endif 34d122019bSMatthew Wilcox (Oracle) }; 35401fb12cSVlastimil Babka struct kmem_cache *slab_cache; 36d122019bSMatthew Wilcox (Oracle) /* Double-word boundary */ 37d122019bSMatthew Wilcox (Oracle) void *freelist; /* first free object */ 38d122019bSMatthew Wilcox (Oracle) union { 39401fb12cSVlastimil Babka unsigned long counters; 40401fb12cSVlastimil Babka struct { 41d122019bSMatthew Wilcox (Oracle) unsigned inuse:16; 42d122019bSMatthew Wilcox (Oracle) unsigned objects:15; 43d122019bSMatthew Wilcox (Oracle) unsigned frozen:1; 44d122019bSMatthew Wilcox (Oracle) }; 45d122019bSMatthew Wilcox (Oracle) }; 46401fb12cSVlastimil Babka unsigned int __unused; 47d122019bSMatthew Wilcox (Oracle) 48401fb12cSVlastimil Babka #elif defined(CONFIG_SLOB) 49401fb12cSVlastimil Babka 50401fb12cSVlastimil Babka struct list_head slab_list; 51401fb12cSVlastimil Babka void *__unused_1; 52401fb12cSVlastimil Babka void *freelist; /* first free block */ 53401fb12cSVlastimil Babka void *__unused_2; 54401fb12cSVlastimil Babka int units; 55401fb12cSVlastimil Babka 56401fb12cSVlastimil Babka #else 57401fb12cSVlastimil Babka #error "Unexpected slab allocator configured" 58401fb12cSVlastimil Babka #endif 59401fb12cSVlastimil Babka 60d122019bSMatthew Wilcox (Oracle) atomic_t __page_refcount; 61d122019bSMatthew Wilcox (Oracle) #ifdef CONFIG_MEMCG 62d122019bSMatthew Wilcox (Oracle) unsigned long memcg_data; 63d122019bSMatthew Wilcox (Oracle) #endif 64d122019bSMatthew Wilcox (Oracle) }; 65d122019bSMatthew Wilcox (Oracle) 66d122019bSMatthew Wilcox (Oracle) #define SLAB_MATCH(pg, sl) \ 67d122019bSMatthew Wilcox (Oracle) static_assert(offsetof(struct page, pg) == offsetof(struct slab, sl)) 68d122019bSMatthew Wilcox (Oracle) SLAB_MATCH(flags, __page_flags); 69d122019bSMatthew Wilcox (Oracle) SLAB_MATCH(compound_head, slab_list); /* Ensure bit 0 is clear */ 70d122019bSMatthew Wilcox (Oracle) SLAB_MATCH(slab_list, slab_list); 71401fb12cSVlastimil Babka #ifndef CONFIG_SLOB 72d122019bSMatthew Wilcox (Oracle) SLAB_MATCH(rcu_head, rcu_head); 73d122019bSMatthew Wilcox (Oracle) SLAB_MATCH(slab_cache, slab_cache); 74401fb12cSVlastimil Babka #endif 75401fb12cSVlastimil Babka #ifdef CONFIG_SLAB 76d122019bSMatthew Wilcox (Oracle) SLAB_MATCH(s_mem, s_mem); 77d122019bSMatthew Wilcox (Oracle) SLAB_MATCH(active, active); 78401fb12cSVlastimil Babka #endif 79d122019bSMatthew Wilcox (Oracle) SLAB_MATCH(_refcount, __page_refcount); 80d122019bSMatthew Wilcox (Oracle) #ifdef CONFIG_MEMCG 81d122019bSMatthew Wilcox (Oracle) SLAB_MATCH(memcg_data, memcg_data); 82d122019bSMatthew Wilcox (Oracle) #endif 83d122019bSMatthew Wilcox (Oracle) #undef SLAB_MATCH 84d122019bSMatthew Wilcox (Oracle) static_assert(sizeof(struct slab) <= sizeof(struct page)); 85d122019bSMatthew Wilcox (Oracle) 86d122019bSMatthew Wilcox (Oracle) /** 87d122019bSMatthew Wilcox (Oracle) * folio_slab - Converts from folio to slab. 88d122019bSMatthew Wilcox (Oracle) * @folio: The folio. 89d122019bSMatthew Wilcox (Oracle) * 90d122019bSMatthew Wilcox (Oracle) * Currently struct slab is a different representation of a folio where 91d122019bSMatthew Wilcox (Oracle) * folio_test_slab() is true. 92d122019bSMatthew Wilcox (Oracle) * 93d122019bSMatthew Wilcox (Oracle) * Return: The slab which contains this folio. 94d122019bSMatthew Wilcox (Oracle) */ 95d122019bSMatthew Wilcox (Oracle) #define folio_slab(folio) (_Generic((folio), \ 96d122019bSMatthew Wilcox (Oracle) const struct folio *: (const struct slab *)(folio), \ 97d122019bSMatthew Wilcox (Oracle) struct folio *: (struct slab *)(folio))) 98d122019bSMatthew Wilcox (Oracle) 99d122019bSMatthew Wilcox (Oracle) /** 100d122019bSMatthew Wilcox (Oracle) * slab_folio - The folio allocated for a slab 101d122019bSMatthew Wilcox (Oracle) * @slab: The slab. 102d122019bSMatthew Wilcox (Oracle) * 103d122019bSMatthew Wilcox (Oracle) * Slabs are allocated as folios that contain the individual objects and are 104d122019bSMatthew Wilcox (Oracle) * using some fields in the first struct page of the folio - those fields are 105d122019bSMatthew Wilcox (Oracle) * now accessed by struct slab. It is occasionally necessary to convert back to 106d122019bSMatthew Wilcox (Oracle) * a folio in order to communicate with the rest of the mm. Please use this 107d122019bSMatthew Wilcox (Oracle) * helper function instead of casting yourself, as the implementation may change 108d122019bSMatthew Wilcox (Oracle) * in the future. 109d122019bSMatthew Wilcox (Oracle) */ 110d122019bSMatthew Wilcox (Oracle) #define slab_folio(s) (_Generic((s), \ 111d122019bSMatthew Wilcox (Oracle) const struct slab *: (const struct folio *)s, \ 112d122019bSMatthew Wilcox (Oracle) struct slab *: (struct folio *)s)) 113d122019bSMatthew Wilcox (Oracle) 114d122019bSMatthew Wilcox (Oracle) /** 115d122019bSMatthew Wilcox (Oracle) * page_slab - Converts from first struct page to slab. 116d122019bSMatthew Wilcox (Oracle) * @p: The first (either head of compound or single) page of slab. 117d122019bSMatthew Wilcox (Oracle) * 118d122019bSMatthew Wilcox (Oracle) * A temporary wrapper to convert struct page to struct slab in situations where 119d122019bSMatthew Wilcox (Oracle) * we know the page is the compound head, or single order-0 page. 120d122019bSMatthew Wilcox (Oracle) * 121d122019bSMatthew Wilcox (Oracle) * Long-term ideally everything would work with struct slab directly or go 122d122019bSMatthew Wilcox (Oracle) * through folio to struct slab. 123d122019bSMatthew Wilcox (Oracle) * 124d122019bSMatthew Wilcox (Oracle) * Return: The slab which contains this page 125d122019bSMatthew Wilcox (Oracle) */ 126d122019bSMatthew Wilcox (Oracle) #define page_slab(p) (_Generic((p), \ 127d122019bSMatthew Wilcox (Oracle) const struct page *: (const struct slab *)(p), \ 128d122019bSMatthew Wilcox (Oracle) struct page *: (struct slab *)(p))) 129d122019bSMatthew Wilcox (Oracle) 130d122019bSMatthew Wilcox (Oracle) /** 131d122019bSMatthew Wilcox (Oracle) * slab_page - The first struct page allocated for a slab 132d122019bSMatthew Wilcox (Oracle) * @slab: The slab. 133d122019bSMatthew Wilcox (Oracle) * 134d122019bSMatthew Wilcox (Oracle) * A convenience wrapper for converting slab to the first struct page of the 135d122019bSMatthew Wilcox (Oracle) * underlying folio, to communicate with code not yet converted to folio or 136d122019bSMatthew Wilcox (Oracle) * struct slab. 137d122019bSMatthew Wilcox (Oracle) */ 138d122019bSMatthew Wilcox (Oracle) #define slab_page(s) folio_page(slab_folio(s), 0) 139d122019bSMatthew Wilcox (Oracle) 140d122019bSMatthew Wilcox (Oracle) /* 141d122019bSMatthew Wilcox (Oracle) * If network-based swap is enabled, sl*b must keep track of whether pages 142d122019bSMatthew Wilcox (Oracle) * were allocated from pfmemalloc reserves. 143d122019bSMatthew Wilcox (Oracle) */ 144d122019bSMatthew Wilcox (Oracle) static inline bool slab_test_pfmemalloc(const struct slab *slab) 145d122019bSMatthew Wilcox (Oracle) { 146d122019bSMatthew Wilcox (Oracle) return folio_test_active((struct folio *)slab_folio(slab)); 147d122019bSMatthew Wilcox (Oracle) } 148d122019bSMatthew Wilcox (Oracle) 149d122019bSMatthew Wilcox (Oracle) static inline void slab_set_pfmemalloc(struct slab *slab) 150d122019bSMatthew Wilcox (Oracle) { 151d122019bSMatthew Wilcox (Oracle) folio_set_active(slab_folio(slab)); 152d122019bSMatthew Wilcox (Oracle) } 153d122019bSMatthew Wilcox (Oracle) 154d122019bSMatthew Wilcox (Oracle) static inline void slab_clear_pfmemalloc(struct slab *slab) 155d122019bSMatthew Wilcox (Oracle) { 156d122019bSMatthew Wilcox (Oracle) folio_clear_active(slab_folio(slab)); 157d122019bSMatthew Wilcox (Oracle) } 158d122019bSMatthew Wilcox (Oracle) 159d122019bSMatthew Wilcox (Oracle) static inline void __slab_clear_pfmemalloc(struct slab *slab) 160d122019bSMatthew Wilcox (Oracle) { 161d122019bSMatthew Wilcox (Oracle) __folio_clear_active(slab_folio(slab)); 162d122019bSMatthew Wilcox (Oracle) } 163d122019bSMatthew Wilcox (Oracle) 164d122019bSMatthew Wilcox (Oracle) static inline void *slab_address(const struct slab *slab) 165d122019bSMatthew Wilcox (Oracle) { 166d122019bSMatthew Wilcox (Oracle) return folio_address(slab_folio(slab)); 167d122019bSMatthew Wilcox (Oracle) } 168d122019bSMatthew Wilcox (Oracle) 169d122019bSMatthew Wilcox (Oracle) static inline int slab_nid(const struct slab *slab) 170d122019bSMatthew Wilcox (Oracle) { 171d122019bSMatthew Wilcox (Oracle) return folio_nid(slab_folio(slab)); 172d122019bSMatthew Wilcox (Oracle) } 173d122019bSMatthew Wilcox (Oracle) 174d122019bSMatthew Wilcox (Oracle) static inline pg_data_t *slab_pgdat(const struct slab *slab) 175d122019bSMatthew Wilcox (Oracle) { 176d122019bSMatthew Wilcox (Oracle) return folio_pgdat(slab_folio(slab)); 177d122019bSMatthew Wilcox (Oracle) } 178d122019bSMatthew Wilcox (Oracle) 179d122019bSMatthew Wilcox (Oracle) static inline struct slab *virt_to_slab(const void *addr) 180d122019bSMatthew Wilcox (Oracle) { 181d122019bSMatthew Wilcox (Oracle) struct folio *folio = virt_to_folio(addr); 182d122019bSMatthew Wilcox (Oracle) 183d122019bSMatthew Wilcox (Oracle) if (!folio_test_slab(folio)) 184d122019bSMatthew Wilcox (Oracle) return NULL; 185d122019bSMatthew Wilcox (Oracle) 186d122019bSMatthew Wilcox (Oracle) return folio_slab(folio); 187d122019bSMatthew Wilcox (Oracle) } 188d122019bSMatthew Wilcox (Oracle) 189d122019bSMatthew Wilcox (Oracle) static inline int slab_order(const struct slab *slab) 190d122019bSMatthew Wilcox (Oracle) { 191d122019bSMatthew Wilcox (Oracle) return folio_order((struct folio *)slab_folio(slab)); 192d122019bSMatthew Wilcox (Oracle) } 193d122019bSMatthew Wilcox (Oracle) 194d122019bSMatthew Wilcox (Oracle) static inline size_t slab_size(const struct slab *slab) 195d122019bSMatthew Wilcox (Oracle) { 196d122019bSMatthew Wilcox (Oracle) return PAGE_SIZE << slab_order(slab); 197d122019bSMatthew Wilcox (Oracle) } 198d122019bSMatthew Wilcox (Oracle) 19907f361b2SJoonsoo Kim #ifdef CONFIG_SLOB 20007f361b2SJoonsoo Kim /* 20107f361b2SJoonsoo Kim * Common fields provided in kmem_cache by all slab allocators 20207f361b2SJoonsoo Kim * This struct is either used directly by the allocator (SLOB) 20307f361b2SJoonsoo Kim * or the allocator must include definitions for all fields 20407f361b2SJoonsoo Kim * provided in kmem_cache_common in their definition of kmem_cache. 20507f361b2SJoonsoo Kim * 20607f361b2SJoonsoo Kim * Once we can do anonymous structs (C11 standard) we could put a 20707f361b2SJoonsoo Kim * anonymous struct definition in these allocators so that the 20807f361b2SJoonsoo Kim * separate allocations in the kmem_cache structure of SLAB and 20907f361b2SJoonsoo Kim * SLUB is no longer needed. 21007f361b2SJoonsoo Kim */ 21107f361b2SJoonsoo Kim struct kmem_cache { 21207f361b2SJoonsoo Kim unsigned int object_size;/* The original size of the object */ 21307f361b2SJoonsoo Kim unsigned int size; /* The aligned/padded/added on size */ 21407f361b2SJoonsoo Kim unsigned int align; /* Alignment as calculated */ 215d50112edSAlexey Dobriyan slab_flags_t flags; /* Active flags on the slab */ 2167bbdb81eSAlexey Dobriyan unsigned int useroffset;/* Usercopy region offset */ 2177bbdb81eSAlexey Dobriyan unsigned int usersize; /* Usercopy region size */ 21807f361b2SJoonsoo Kim const char *name; /* Slab name for sysfs */ 21907f361b2SJoonsoo Kim int refcount; /* Use counter */ 22007f361b2SJoonsoo Kim void (*ctor)(void *); /* Called on object slot creation */ 22107f361b2SJoonsoo Kim struct list_head list; /* List of all slab caches on the system */ 22207f361b2SJoonsoo Kim }; 22307f361b2SJoonsoo Kim 22407f361b2SJoonsoo Kim #endif /* CONFIG_SLOB */ 22507f361b2SJoonsoo Kim 22607f361b2SJoonsoo Kim #ifdef CONFIG_SLAB 22707f361b2SJoonsoo Kim #include <linux/slab_def.h> 22807f361b2SJoonsoo Kim #endif 22907f361b2SJoonsoo Kim 23007f361b2SJoonsoo Kim #ifdef CONFIG_SLUB 23107f361b2SJoonsoo Kim #include <linux/slub_def.h> 23207f361b2SJoonsoo Kim #endif 23307f361b2SJoonsoo Kim 23407f361b2SJoonsoo Kim #include <linux/memcontrol.h> 23511c7aec2SJesper Dangaard Brouer #include <linux/fault-inject.h> 23611c7aec2SJesper Dangaard Brouer #include <linux/kasan.h> 23711c7aec2SJesper Dangaard Brouer #include <linux/kmemleak.h> 2387c00fce9SThomas Garnier #include <linux/random.h> 239d92a8cfcSPeter Zijlstra #include <linux/sched/mm.h> 24007f361b2SJoonsoo Kim 24197d06609SChristoph Lameter /* 24297d06609SChristoph Lameter * State of the slab allocator. 24397d06609SChristoph Lameter * 24497d06609SChristoph Lameter * This is used to describe the states of the allocator during bootup. 24597d06609SChristoph Lameter * Allocators use this to gradually bootstrap themselves. Most allocators 24697d06609SChristoph Lameter * have the problem that the structures used for managing slab caches are 24797d06609SChristoph Lameter * allocated from slab caches themselves. 24897d06609SChristoph Lameter */ 24997d06609SChristoph Lameter enum slab_state { 25097d06609SChristoph Lameter DOWN, /* No slab functionality yet */ 25197d06609SChristoph Lameter PARTIAL, /* SLUB: kmem_cache_node available */ 252ce8eb6c4SChristoph Lameter PARTIAL_NODE, /* SLAB: kmalloc size for node struct available */ 25397d06609SChristoph Lameter UP, /* Slab caches usable but not all extras yet */ 25497d06609SChristoph Lameter FULL /* Everything is working */ 25597d06609SChristoph Lameter }; 25697d06609SChristoph Lameter 25797d06609SChristoph Lameter extern enum slab_state slab_state; 25897d06609SChristoph Lameter 25918004c5dSChristoph Lameter /* The slab cache mutex protects the management structures during changes */ 26018004c5dSChristoph Lameter extern struct mutex slab_mutex; 2619b030cb8SChristoph Lameter 2629b030cb8SChristoph Lameter /* The list of all slab caches on the system */ 26318004c5dSChristoph Lameter extern struct list_head slab_caches; 26418004c5dSChristoph Lameter 2659b030cb8SChristoph Lameter /* The slab cache that manages slab cache information */ 2669b030cb8SChristoph Lameter extern struct kmem_cache *kmem_cache; 2679b030cb8SChristoph Lameter 268af3b5f87SVlastimil Babka /* A table of kmalloc cache names and sizes */ 269af3b5f87SVlastimil Babka extern const struct kmalloc_info_struct { 270cb5d9fb3SPengfei Li const char *name[NR_KMALLOC_TYPES]; 27155de8b9cSAlexey Dobriyan unsigned int size; 272af3b5f87SVlastimil Babka } kmalloc_info[]; 273af3b5f87SVlastimil Babka 274f97d5f63SChristoph Lameter #ifndef CONFIG_SLOB 275f97d5f63SChristoph Lameter /* Kmalloc array related functions */ 27634cc6990SDaniel Sanders void setup_kmalloc_cache_index_table(void); 277d50112edSAlexey Dobriyan void create_kmalloc_caches(slab_flags_t); 2782c59dd65SChristoph Lameter 2792c59dd65SChristoph Lameter /* Find the kmalloc slab corresponding for a certain size */ 2802c59dd65SChristoph Lameter struct kmem_cache *kmalloc_slab(size_t, gfp_t); 281f97d5f63SChristoph Lameter #endif 282f97d5f63SChristoph Lameter 28344405099SLong Li gfp_t kmalloc_fix_flags(gfp_t flags); 284f97d5f63SChristoph Lameter 2859b030cb8SChristoph Lameter /* Functions provided by the slab allocators */ 286d50112edSAlexey Dobriyan int __kmem_cache_create(struct kmem_cache *, slab_flags_t flags); 28797d06609SChristoph Lameter 28855de8b9cSAlexey Dobriyan struct kmem_cache *create_kmalloc_cache(const char *name, unsigned int size, 28955de8b9cSAlexey Dobriyan slab_flags_t flags, unsigned int useroffset, 29055de8b9cSAlexey Dobriyan unsigned int usersize); 29145530c44SChristoph Lameter extern void create_boot_cache(struct kmem_cache *, const char *name, 292361d575eSAlexey Dobriyan unsigned int size, slab_flags_t flags, 293361d575eSAlexey Dobriyan unsigned int useroffset, unsigned int usersize); 29445530c44SChristoph Lameter 295423c929cSJoonsoo Kim int slab_unmergeable(struct kmem_cache *s); 296f4957d5bSAlexey Dobriyan struct kmem_cache *find_mergeable(unsigned size, unsigned align, 297d50112edSAlexey Dobriyan slab_flags_t flags, const char *name, void (*ctor)(void *)); 29812220deaSJoonsoo Kim #ifndef CONFIG_SLOB 2992633d7a0SGlauber Costa struct kmem_cache * 300f4957d5bSAlexey Dobriyan __kmem_cache_alias(const char *name, unsigned int size, unsigned int align, 301d50112edSAlexey Dobriyan slab_flags_t flags, void (*ctor)(void *)); 302423c929cSJoonsoo Kim 3030293d1fdSAlexey Dobriyan slab_flags_t kmem_cache_flags(unsigned int object_size, 30437540008SNikolay Borisov slab_flags_t flags, const char *name); 305cbb79694SChristoph Lameter #else 3062633d7a0SGlauber Costa static inline struct kmem_cache * 307f4957d5bSAlexey Dobriyan __kmem_cache_alias(const char *name, unsigned int size, unsigned int align, 308d50112edSAlexey Dobriyan slab_flags_t flags, void (*ctor)(void *)) 309cbb79694SChristoph Lameter { return NULL; } 310423c929cSJoonsoo Kim 3110293d1fdSAlexey Dobriyan static inline slab_flags_t kmem_cache_flags(unsigned int object_size, 31237540008SNikolay Borisov slab_flags_t flags, const char *name) 313423c929cSJoonsoo Kim { 314423c929cSJoonsoo Kim return flags; 315423c929cSJoonsoo Kim } 316cbb79694SChristoph Lameter #endif 317cbb79694SChristoph Lameter 318cbb79694SChristoph Lameter 319d8843922SGlauber Costa /* Legal flag mask for kmem_cache_create(), for various configurations */ 3206d6ea1e9SNicolas Boichat #define SLAB_CORE_FLAGS (SLAB_HWCACHE_ALIGN | SLAB_CACHE_DMA | \ 3216d6ea1e9SNicolas Boichat SLAB_CACHE_DMA32 | SLAB_PANIC | \ 3225f0d5a3aSPaul E. McKenney SLAB_TYPESAFE_BY_RCU | SLAB_DEBUG_OBJECTS ) 323d8843922SGlauber Costa 324d8843922SGlauber Costa #if defined(CONFIG_DEBUG_SLAB) 325d8843922SGlauber Costa #define SLAB_DEBUG_FLAGS (SLAB_RED_ZONE | SLAB_POISON | SLAB_STORE_USER) 326d8843922SGlauber Costa #elif defined(CONFIG_SLUB_DEBUG) 327d8843922SGlauber Costa #define SLAB_DEBUG_FLAGS (SLAB_RED_ZONE | SLAB_POISON | SLAB_STORE_USER | \ 328becfda68SLaura Abbott SLAB_TRACE | SLAB_CONSISTENCY_CHECKS) 329d8843922SGlauber Costa #else 330d8843922SGlauber Costa #define SLAB_DEBUG_FLAGS (0) 331d8843922SGlauber Costa #endif 332d8843922SGlauber Costa 333d8843922SGlauber Costa #if defined(CONFIG_SLAB) 334d8843922SGlauber Costa #define SLAB_CACHE_FLAGS (SLAB_MEM_SPREAD | SLAB_NOLEAKTRACE | \ 335230e9fc2SVladimir Davydov SLAB_RECLAIM_ACCOUNT | SLAB_TEMPORARY | \ 33675f296d9SLevin, Alexander (Sasha Levin) SLAB_ACCOUNT) 337d8843922SGlauber Costa #elif defined(CONFIG_SLUB) 338d8843922SGlauber Costa #define SLAB_CACHE_FLAGS (SLAB_NOLEAKTRACE | SLAB_RECLAIM_ACCOUNT | \ 33975f296d9SLevin, Alexander (Sasha Levin) SLAB_TEMPORARY | SLAB_ACCOUNT) 340d8843922SGlauber Costa #else 34134dbc3aaSRustam Kovhaev #define SLAB_CACHE_FLAGS (SLAB_NOLEAKTRACE) 342d8843922SGlauber Costa #endif 343d8843922SGlauber Costa 344e70954fdSThomas Garnier /* Common flags available with current configuration */ 345d8843922SGlauber Costa #define CACHE_CREATE_MASK (SLAB_CORE_FLAGS | SLAB_DEBUG_FLAGS | SLAB_CACHE_FLAGS) 346d8843922SGlauber Costa 347e70954fdSThomas Garnier /* Common flags permitted for kmem_cache_create */ 348e70954fdSThomas Garnier #define SLAB_FLAGS_PERMITTED (SLAB_CORE_FLAGS | \ 349e70954fdSThomas Garnier SLAB_RED_ZONE | \ 350e70954fdSThomas Garnier SLAB_POISON | \ 351e70954fdSThomas Garnier SLAB_STORE_USER | \ 352e70954fdSThomas Garnier SLAB_TRACE | \ 353e70954fdSThomas Garnier SLAB_CONSISTENCY_CHECKS | \ 354e70954fdSThomas Garnier SLAB_MEM_SPREAD | \ 355e70954fdSThomas Garnier SLAB_NOLEAKTRACE | \ 356e70954fdSThomas Garnier SLAB_RECLAIM_ACCOUNT | \ 357e70954fdSThomas Garnier SLAB_TEMPORARY | \ 358e70954fdSThomas Garnier SLAB_ACCOUNT) 359e70954fdSThomas Garnier 360f9e13c0aSShakeel Butt bool __kmem_cache_empty(struct kmem_cache *); 361945cf2b6SChristoph Lameter int __kmem_cache_shutdown(struct kmem_cache *); 36252b4b950SDmitry Safonov void __kmem_cache_release(struct kmem_cache *); 363c9fc5864STejun Heo int __kmem_cache_shrink(struct kmem_cache *); 36441a21285SChristoph Lameter void slab_kmem_cache_release(struct kmem_cache *); 365945cf2b6SChristoph Lameter 366b7454ad3SGlauber Costa struct seq_file; 367b7454ad3SGlauber Costa struct file; 368b7454ad3SGlauber Costa 3690d7561c6SGlauber Costa struct slabinfo { 3700d7561c6SGlauber Costa unsigned long active_objs; 3710d7561c6SGlauber Costa unsigned long num_objs; 3720d7561c6SGlauber Costa unsigned long active_slabs; 3730d7561c6SGlauber Costa unsigned long num_slabs; 3740d7561c6SGlauber Costa unsigned long shared_avail; 3750d7561c6SGlauber Costa unsigned int limit; 3760d7561c6SGlauber Costa unsigned int batchcount; 3770d7561c6SGlauber Costa unsigned int shared; 3780d7561c6SGlauber Costa unsigned int objects_per_slab; 3790d7561c6SGlauber Costa unsigned int cache_order; 3800d7561c6SGlauber Costa }; 3810d7561c6SGlauber Costa 3820d7561c6SGlauber Costa void get_slabinfo(struct kmem_cache *s, struct slabinfo *sinfo); 3830d7561c6SGlauber Costa void slabinfo_show_stats(struct seq_file *m, struct kmem_cache *s); 384b7454ad3SGlauber Costa ssize_t slabinfo_write(struct file *file, const char __user *buffer, 385b7454ad3SGlauber Costa size_t count, loff_t *ppos); 386ba6c496eSGlauber Costa 387484748f0SChristoph Lameter /* 388484748f0SChristoph Lameter * Generic implementation of bulk operations 389484748f0SChristoph Lameter * These are useful for situations in which the allocator cannot 3909f706d68SJesper Dangaard Brouer * perform optimizations. In that case segments of the object listed 391484748f0SChristoph Lameter * may be allocated or freed using these operations. 392484748f0SChristoph Lameter */ 393484748f0SChristoph Lameter void __kmem_cache_free_bulk(struct kmem_cache *, size_t, void **); 394865762a8SJesper Dangaard Brouer int __kmem_cache_alloc_bulk(struct kmem_cache *, gfp_t, size_t, void **); 395484748f0SChristoph Lameter 3961a984c4eSMuchun Song static inline enum node_stat_item cache_vmstat_idx(struct kmem_cache *s) 3976cea1d56SRoman Gushchin { 3986cea1d56SRoman Gushchin return (s->flags & SLAB_RECLAIM_ACCOUNT) ? 399d42f3245SRoman Gushchin NR_SLAB_RECLAIMABLE_B : NR_SLAB_UNRECLAIMABLE_B; 4006cea1d56SRoman Gushchin } 4016cea1d56SRoman Gushchin 402e42f174eSVlastimil Babka #ifdef CONFIG_SLUB_DEBUG 403e42f174eSVlastimil Babka #ifdef CONFIG_SLUB_DEBUG_ON 404e42f174eSVlastimil Babka DECLARE_STATIC_KEY_TRUE(slub_debug_enabled); 405e42f174eSVlastimil Babka #else 406e42f174eSVlastimil Babka DECLARE_STATIC_KEY_FALSE(slub_debug_enabled); 407e42f174eSVlastimil Babka #endif 408e42f174eSVlastimil Babka extern void print_tracking(struct kmem_cache *s, void *object); 4091f9f78b1SOliver Glitta long validate_slab_cache(struct kmem_cache *s); 4100d4a062aSMarco Elver static inline bool __slub_debug_enabled(void) 4110d4a062aSMarco Elver { 4120d4a062aSMarco Elver return static_branch_unlikely(&slub_debug_enabled); 4130d4a062aSMarco Elver } 414e42f174eSVlastimil Babka #else 415e42f174eSVlastimil Babka static inline void print_tracking(struct kmem_cache *s, void *object) 416e42f174eSVlastimil Babka { 417e42f174eSVlastimil Babka } 4180d4a062aSMarco Elver static inline bool __slub_debug_enabled(void) 4190d4a062aSMarco Elver { 4200d4a062aSMarco Elver return false; 4210d4a062aSMarco Elver } 422e42f174eSVlastimil Babka #endif 423e42f174eSVlastimil Babka 424e42f174eSVlastimil Babka /* 425e42f174eSVlastimil Babka * Returns true if any of the specified slub_debug flags is enabled for the 426e42f174eSVlastimil Babka * cache. Use only for flags parsed by setup_slub_debug() as it also enables 427e42f174eSVlastimil Babka * the static key. 428e42f174eSVlastimil Babka */ 429e42f174eSVlastimil Babka static inline bool kmem_cache_debug_flags(struct kmem_cache *s, slab_flags_t flags) 430e42f174eSVlastimil Babka { 4310d4a062aSMarco Elver if (IS_ENABLED(CONFIG_SLUB_DEBUG)) 432e42f174eSVlastimil Babka VM_WARN_ON_ONCE(!(flags & SLAB_DEBUG_FLAGS)); 4330d4a062aSMarco Elver if (__slub_debug_enabled()) 434e42f174eSVlastimil Babka return s->flags & flags; 435e42f174eSVlastimil Babka return false; 436e42f174eSVlastimil Babka } 437e42f174eSVlastimil Babka 43884c07d11SKirill Tkhai #ifdef CONFIG_MEMCG_KMEM 4394b5f8d9aSVlastimil Babka /* 4404b5f8d9aSVlastimil Babka * slab_objcgs - get the object cgroups vector associated with a slab 4414b5f8d9aSVlastimil Babka * @slab: a pointer to the slab struct 4424b5f8d9aSVlastimil Babka * 4434b5f8d9aSVlastimil Babka * Returns a pointer to the object cgroups vector associated with the slab, 4444b5f8d9aSVlastimil Babka * or NULL if no such vector has been associated yet. 4454b5f8d9aSVlastimil Babka */ 4464b5f8d9aSVlastimil Babka static inline struct obj_cgroup **slab_objcgs(struct slab *slab) 4474b5f8d9aSVlastimil Babka { 4484b5f8d9aSVlastimil Babka unsigned long memcg_data = READ_ONCE(slab->memcg_data); 4494b5f8d9aSVlastimil Babka 4504b5f8d9aSVlastimil Babka VM_BUG_ON_PAGE(memcg_data && !(memcg_data & MEMCG_DATA_OBJCGS), 4514b5f8d9aSVlastimil Babka slab_page(slab)); 4524b5f8d9aSVlastimil Babka VM_BUG_ON_PAGE(memcg_data & MEMCG_DATA_KMEM, slab_page(slab)); 4534b5f8d9aSVlastimil Babka 4544b5f8d9aSVlastimil Babka return (struct obj_cgroup **)(memcg_data & ~MEMCG_DATA_FLAGS_MASK); 4554b5f8d9aSVlastimil Babka } 4564b5f8d9aSVlastimil Babka 4574b5f8d9aSVlastimil Babka int memcg_alloc_slab_cgroups(struct slab *slab, struct kmem_cache *s, 4584b5f8d9aSVlastimil Babka gfp_t gfp, bool new_slab); 459fdbcb2a6SWaiman Long void mod_objcg_state(struct obj_cgroup *objcg, struct pglist_data *pgdat, 460fdbcb2a6SWaiman Long enum node_stat_item idx, int nr); 461286e04b8SRoman Gushchin 4624b5f8d9aSVlastimil Babka static inline void memcg_free_slab_cgroups(struct slab *slab) 463286e04b8SRoman Gushchin { 4644b5f8d9aSVlastimil Babka kfree(slab_objcgs(slab)); 4654b5f8d9aSVlastimil Babka slab->memcg_data = 0; 466286e04b8SRoman Gushchin } 467286e04b8SRoman Gushchin 468f2fe7b09SRoman Gushchin static inline size_t obj_full_size(struct kmem_cache *s) 469f2fe7b09SRoman Gushchin { 470f2fe7b09SRoman Gushchin /* 471f2fe7b09SRoman Gushchin * For each accounted object there is an extra space which is used 472f2fe7b09SRoman Gushchin * to store obj_cgroup membership. Charge it too. 473f2fe7b09SRoman Gushchin */ 474f2fe7b09SRoman Gushchin return s->size + sizeof(struct obj_cgroup *); 475f2fe7b09SRoman Gushchin } 476f2fe7b09SRoman Gushchin 477becaba65SRoman Gushchin /* 478becaba65SRoman Gushchin * Returns false if the allocation should fail. 479becaba65SRoman Gushchin */ 480becaba65SRoman Gushchin static inline bool memcg_slab_pre_alloc_hook(struct kmem_cache *s, 481becaba65SRoman Gushchin struct obj_cgroup **objcgp, 482becaba65SRoman Gushchin size_t objects, gfp_t flags) 483f2fe7b09SRoman Gushchin { 4849855609bSRoman Gushchin struct obj_cgroup *objcg; 485f2fe7b09SRoman Gushchin 486becaba65SRoman Gushchin if (!memcg_kmem_enabled()) 487becaba65SRoman Gushchin return true; 488becaba65SRoman Gushchin 489becaba65SRoman Gushchin if (!(flags & __GFP_ACCOUNT) && !(s->flags & SLAB_ACCOUNT)) 490becaba65SRoman Gushchin return true; 491becaba65SRoman Gushchin 4929855609bSRoman Gushchin objcg = get_obj_cgroup_from_current(); 4939855609bSRoman Gushchin if (!objcg) 494becaba65SRoman Gushchin return true; 4959855609bSRoman Gushchin 4969855609bSRoman Gushchin if (obj_cgroup_charge(objcg, flags, objects * obj_full_size(s))) { 4979855609bSRoman Gushchin obj_cgroup_put(objcg); 498becaba65SRoman Gushchin return false; 499f2fe7b09SRoman Gushchin } 500f2fe7b09SRoman Gushchin 501becaba65SRoman Gushchin *objcgp = objcg; 502becaba65SRoman Gushchin return true; 503f2fe7b09SRoman Gushchin } 504f2fe7b09SRoman Gushchin 505964d4bd3SRoman Gushchin static inline void memcg_slab_post_alloc_hook(struct kmem_cache *s, 506964d4bd3SRoman Gushchin struct obj_cgroup *objcg, 50710befea9SRoman Gushchin gfp_t flags, size_t size, 50810befea9SRoman Gushchin void **p) 509964d4bd3SRoman Gushchin { 5104b5f8d9aSVlastimil Babka struct slab *slab; 511964d4bd3SRoman Gushchin unsigned long off; 512964d4bd3SRoman Gushchin size_t i; 513964d4bd3SRoman Gushchin 514becaba65SRoman Gushchin if (!memcg_kmem_enabled() || !objcg) 51510befea9SRoman Gushchin return; 51610befea9SRoman Gushchin 517964d4bd3SRoman Gushchin for (i = 0; i < size; i++) { 518964d4bd3SRoman Gushchin if (likely(p[i])) { 5194b5f8d9aSVlastimil Babka slab = virt_to_slab(p[i]); 52010befea9SRoman Gushchin 5214b5f8d9aSVlastimil Babka if (!slab_objcgs(slab) && 5224b5f8d9aSVlastimil Babka memcg_alloc_slab_cgroups(slab, s, flags, 5232e9bd483SRoman Gushchin false)) { 52410befea9SRoman Gushchin obj_cgroup_uncharge(objcg, obj_full_size(s)); 52510befea9SRoman Gushchin continue; 52610befea9SRoman Gushchin } 52710befea9SRoman Gushchin 5284b5f8d9aSVlastimil Babka off = obj_to_index(s, slab, p[i]); 529964d4bd3SRoman Gushchin obj_cgroup_get(objcg); 5304b5f8d9aSVlastimil Babka slab_objcgs(slab)[off] = objcg; 5314b5f8d9aSVlastimil Babka mod_objcg_state(objcg, slab_pgdat(slab), 532f2fe7b09SRoman Gushchin cache_vmstat_idx(s), obj_full_size(s)); 533f2fe7b09SRoman Gushchin } else { 534f2fe7b09SRoman Gushchin obj_cgroup_uncharge(objcg, obj_full_size(s)); 535964d4bd3SRoman Gushchin } 536964d4bd3SRoman Gushchin } 537964d4bd3SRoman Gushchin obj_cgroup_put(objcg); 538964d4bd3SRoman Gushchin } 539964d4bd3SRoman Gushchin 540d1b2cf6cSBharata B Rao static inline void memcg_slab_free_hook(struct kmem_cache *s_orig, 541d1b2cf6cSBharata B Rao void **p, int objects) 542964d4bd3SRoman Gushchin { 543d1b2cf6cSBharata B Rao struct kmem_cache *s; 544270c6a71SRoman Gushchin struct obj_cgroup **objcgs; 545964d4bd3SRoman Gushchin struct obj_cgroup *objcg; 5464b5f8d9aSVlastimil Babka struct slab *slab; 547964d4bd3SRoman Gushchin unsigned int off; 548d1b2cf6cSBharata B Rao int i; 549964d4bd3SRoman Gushchin 55010befea9SRoman Gushchin if (!memcg_kmem_enabled()) 55110befea9SRoman Gushchin return; 55210befea9SRoman Gushchin 553d1b2cf6cSBharata B Rao for (i = 0; i < objects; i++) { 554d1b2cf6cSBharata B Rao if (unlikely(!p[i])) 555d1b2cf6cSBharata B Rao continue; 556d1b2cf6cSBharata B Rao 5574b5f8d9aSVlastimil Babka slab = virt_to_slab(p[i]); 5584b5f8d9aSVlastimil Babka /* we could be given a kmalloc_large() object, skip those */ 5594b5f8d9aSVlastimil Babka if (!slab) 5604b5f8d9aSVlastimil Babka continue; 5614b5f8d9aSVlastimil Babka 5624b5f8d9aSVlastimil Babka objcgs = slab_objcgs(slab); 563270c6a71SRoman Gushchin if (!objcgs) 564d1b2cf6cSBharata B Rao continue; 565964d4bd3SRoman Gushchin 566d1b2cf6cSBharata B Rao if (!s_orig) 5674b5f8d9aSVlastimil Babka s = slab->slab_cache; 568d1b2cf6cSBharata B Rao else 569d1b2cf6cSBharata B Rao s = s_orig; 570d1b2cf6cSBharata B Rao 5714b5f8d9aSVlastimil Babka off = obj_to_index(s, slab, p[i]); 572270c6a71SRoman Gushchin objcg = objcgs[off]; 57310befea9SRoman Gushchin if (!objcg) 574d1b2cf6cSBharata B Rao continue; 57510befea9SRoman Gushchin 576270c6a71SRoman Gushchin objcgs[off] = NULL; 577f2fe7b09SRoman Gushchin obj_cgroup_uncharge(objcg, obj_full_size(s)); 5784b5f8d9aSVlastimil Babka mod_objcg_state(objcg, slab_pgdat(slab), cache_vmstat_idx(s), 579f2fe7b09SRoman Gushchin -obj_full_size(s)); 580964d4bd3SRoman Gushchin obj_cgroup_put(objcg); 581964d4bd3SRoman Gushchin } 582d1b2cf6cSBharata B Rao } 583964d4bd3SRoman Gushchin 58484c07d11SKirill Tkhai #else /* CONFIG_MEMCG_KMEM */ 5854b5f8d9aSVlastimil Babka static inline struct obj_cgroup **slab_objcgs(struct slab *slab) 5864b5f8d9aSVlastimil Babka { 5874b5f8d9aSVlastimil Babka return NULL; 5884b5f8d9aSVlastimil Babka } 5894b5f8d9aSVlastimil Babka 5909855609bSRoman Gushchin static inline struct mem_cgroup *memcg_from_slab_obj(void *ptr) 5914d96ba35SRoman Gushchin { 5924d96ba35SRoman Gushchin return NULL; 5934d96ba35SRoman Gushchin } 5944d96ba35SRoman Gushchin 5954b5f8d9aSVlastimil Babka static inline int memcg_alloc_slab_cgroups(struct slab *slab, 5962e9bd483SRoman Gushchin struct kmem_cache *s, gfp_t gfp, 5974b5f8d9aSVlastimil Babka bool new_slab) 598286e04b8SRoman Gushchin { 599286e04b8SRoman Gushchin return 0; 600286e04b8SRoman Gushchin } 601286e04b8SRoman Gushchin 6024b5f8d9aSVlastimil Babka static inline void memcg_free_slab_cgroups(struct slab *slab) 603286e04b8SRoman Gushchin { 604286e04b8SRoman Gushchin } 605286e04b8SRoman Gushchin 606becaba65SRoman Gushchin static inline bool memcg_slab_pre_alloc_hook(struct kmem_cache *s, 607becaba65SRoman Gushchin struct obj_cgroup **objcgp, 608becaba65SRoman Gushchin size_t objects, gfp_t flags) 609f2fe7b09SRoman Gushchin { 610becaba65SRoman Gushchin return true; 611f2fe7b09SRoman Gushchin } 612f2fe7b09SRoman Gushchin 613964d4bd3SRoman Gushchin static inline void memcg_slab_post_alloc_hook(struct kmem_cache *s, 614964d4bd3SRoman Gushchin struct obj_cgroup *objcg, 61510befea9SRoman Gushchin gfp_t flags, size_t size, 61610befea9SRoman Gushchin void **p) 617964d4bd3SRoman Gushchin { 618964d4bd3SRoman Gushchin } 619964d4bd3SRoman Gushchin 620d1b2cf6cSBharata B Rao static inline void memcg_slab_free_hook(struct kmem_cache *s, 621d1b2cf6cSBharata B Rao void **p, int objects) 622964d4bd3SRoman Gushchin { 623964d4bd3SRoman Gushchin } 62484c07d11SKirill Tkhai #endif /* CONFIG_MEMCG_KMEM */ 625b9ce5ef4SGlauber Costa 626401fb12cSVlastimil Babka #ifndef CONFIG_SLOB 627a64b5378SKees Cook static inline struct kmem_cache *virt_to_cache(const void *obj) 628a64b5378SKees Cook { 62982c1775dSMatthew Wilcox (Oracle) struct slab *slab; 630a64b5378SKees Cook 63182c1775dSMatthew Wilcox (Oracle) slab = virt_to_slab(obj); 63282c1775dSMatthew Wilcox (Oracle) if (WARN_ONCE(!slab, "%s: Object is not a Slab page!\n", 633a64b5378SKees Cook __func__)) 634a64b5378SKees Cook return NULL; 63582c1775dSMatthew Wilcox (Oracle) return slab->slab_cache; 636a64b5378SKees Cook } 637a64b5378SKees Cook 638b918653bSMatthew Wilcox (Oracle) static __always_inline void account_slab(struct slab *slab, int order, 639b918653bSMatthew Wilcox (Oracle) struct kmem_cache *s, gfp_t gfp) 6406cea1d56SRoman Gushchin { 6412e9bd483SRoman Gushchin if (memcg_kmem_enabled() && (s->flags & SLAB_ACCOUNT)) 6424b5f8d9aSVlastimil Babka memcg_alloc_slab_cgroups(slab, s, gfp, true); 6432e9bd483SRoman Gushchin 644b918653bSMatthew Wilcox (Oracle) mod_node_page_state(slab_pgdat(slab), cache_vmstat_idx(s), 645f2fe7b09SRoman Gushchin PAGE_SIZE << order); 6466cea1d56SRoman Gushchin } 6476cea1d56SRoman Gushchin 648b918653bSMatthew Wilcox (Oracle) static __always_inline void unaccount_slab(struct slab *slab, int order, 6496cea1d56SRoman Gushchin struct kmem_cache *s) 6506cea1d56SRoman Gushchin { 65110befea9SRoman Gushchin if (memcg_kmem_enabled()) 6524b5f8d9aSVlastimil Babka memcg_free_slab_cgroups(slab); 6539855609bSRoman Gushchin 654b918653bSMatthew Wilcox (Oracle) mod_node_page_state(slab_pgdat(slab), cache_vmstat_idx(s), 655d42f3245SRoman Gushchin -(PAGE_SIZE << order)); 6566cea1d56SRoman Gushchin } 6576cea1d56SRoman Gushchin 658e42f174eSVlastimil Babka static inline struct kmem_cache *cache_from_obj(struct kmem_cache *s, void *x) 659e42f174eSVlastimil Babka { 660e42f174eSVlastimil Babka struct kmem_cache *cachep; 661e42f174eSVlastimil Babka 662e42f174eSVlastimil Babka if (!IS_ENABLED(CONFIG_SLAB_FREELIST_HARDENED) && 663e42f174eSVlastimil Babka !kmem_cache_debug_flags(s, SLAB_CONSISTENCY_CHECKS)) 664e42f174eSVlastimil Babka return s; 665e42f174eSVlastimil Babka 666e42f174eSVlastimil Babka cachep = virt_to_cache(x); 66710befea9SRoman Gushchin if (WARN(cachep && cachep != s, 668e42f174eSVlastimil Babka "%s: Wrong slab cache. %s but object is from %s\n", 669e42f174eSVlastimil Babka __func__, s->name, cachep->name)) 670e42f174eSVlastimil Babka print_tracking(cachep, x); 671e42f174eSVlastimil Babka return cachep; 672e42f174eSVlastimil Babka } 673401fb12cSVlastimil Babka #endif /* CONFIG_SLOB */ 674e42f174eSVlastimil Babka 67511c7aec2SJesper Dangaard Brouer static inline size_t slab_ksize(const struct kmem_cache *s) 67611c7aec2SJesper Dangaard Brouer { 67711c7aec2SJesper Dangaard Brouer #ifndef CONFIG_SLUB 67811c7aec2SJesper Dangaard Brouer return s->object_size; 67911c7aec2SJesper Dangaard Brouer 68011c7aec2SJesper Dangaard Brouer #else /* CONFIG_SLUB */ 68111c7aec2SJesper Dangaard Brouer # ifdef CONFIG_SLUB_DEBUG 68211c7aec2SJesper Dangaard Brouer /* 68311c7aec2SJesper Dangaard Brouer * Debugging requires use of the padding between object 68411c7aec2SJesper Dangaard Brouer * and whatever may come after it. 68511c7aec2SJesper Dangaard Brouer */ 68611c7aec2SJesper Dangaard Brouer if (s->flags & (SLAB_RED_ZONE | SLAB_POISON)) 68711c7aec2SJesper Dangaard Brouer return s->object_size; 68811c7aec2SJesper Dangaard Brouer # endif 68980a9201aSAlexander Potapenko if (s->flags & SLAB_KASAN) 69080a9201aSAlexander Potapenko return s->object_size; 69111c7aec2SJesper Dangaard Brouer /* 69211c7aec2SJesper Dangaard Brouer * If we have the need to store the freelist pointer 69311c7aec2SJesper Dangaard Brouer * back there or track user information then we can 69411c7aec2SJesper Dangaard Brouer * only use the space before that information. 69511c7aec2SJesper Dangaard Brouer */ 6965f0d5a3aSPaul E. McKenney if (s->flags & (SLAB_TYPESAFE_BY_RCU | SLAB_STORE_USER)) 69711c7aec2SJesper Dangaard Brouer return s->inuse; 69811c7aec2SJesper Dangaard Brouer /* 69911c7aec2SJesper Dangaard Brouer * Else we can use all the padding etc for the allocation 70011c7aec2SJesper Dangaard Brouer */ 70111c7aec2SJesper Dangaard Brouer return s->size; 70211c7aec2SJesper Dangaard Brouer #endif 70311c7aec2SJesper Dangaard Brouer } 70411c7aec2SJesper Dangaard Brouer 70511c7aec2SJesper Dangaard Brouer static inline struct kmem_cache *slab_pre_alloc_hook(struct kmem_cache *s, 706964d4bd3SRoman Gushchin struct obj_cgroup **objcgp, 707964d4bd3SRoman Gushchin size_t size, gfp_t flags) 70811c7aec2SJesper Dangaard Brouer { 70911c7aec2SJesper Dangaard Brouer flags &= gfp_allowed_mask; 710d92a8cfcSPeter Zijlstra 71195d6c701SDaniel Vetter might_alloc(flags); 71211c7aec2SJesper Dangaard Brouer 713fab9963aSJesper Dangaard Brouer if (should_failslab(s, flags)) 71411c7aec2SJesper Dangaard Brouer return NULL; 71511c7aec2SJesper Dangaard Brouer 716becaba65SRoman Gushchin if (!memcg_slab_pre_alloc_hook(s, objcgp, size, flags)) 717becaba65SRoman Gushchin return NULL; 71845264778SVladimir Davydov 71945264778SVladimir Davydov return s; 72011c7aec2SJesper Dangaard Brouer } 72111c7aec2SJesper Dangaard Brouer 722964d4bd3SRoman Gushchin static inline void slab_post_alloc_hook(struct kmem_cache *s, 723da844b78SAndrey Konovalov struct obj_cgroup *objcg, gfp_t flags, 724da844b78SAndrey Konovalov size_t size, void **p, bool init) 72511c7aec2SJesper Dangaard Brouer { 72611c7aec2SJesper Dangaard Brouer size_t i; 72711c7aec2SJesper Dangaard Brouer 72811c7aec2SJesper Dangaard Brouer flags &= gfp_allowed_mask; 729da844b78SAndrey Konovalov 730da844b78SAndrey Konovalov /* 731da844b78SAndrey Konovalov * As memory initialization might be integrated into KASAN, 732da844b78SAndrey Konovalov * kasan_slab_alloc and initialization memset must be 733da844b78SAndrey Konovalov * kept together to avoid discrepancies in behavior. 734da844b78SAndrey Konovalov * 735da844b78SAndrey Konovalov * As p[i] might get tagged, memset and kmemleak hook come after KASAN. 736da844b78SAndrey Konovalov */ 73711c7aec2SJesper Dangaard Brouer for (i = 0; i < size; i++) { 738da844b78SAndrey Konovalov p[i] = kasan_slab_alloc(s, p[i], flags, init); 739da844b78SAndrey Konovalov if (p[i] && init && !kasan_has_integrated_init()) 740da844b78SAndrey Konovalov memset(p[i], 0, s->object_size); 74153128245SAndrey Konovalov kmemleak_alloc_recursive(p[i], s->object_size, 1, 74211c7aec2SJesper Dangaard Brouer s->flags, flags); 74311c7aec2SJesper Dangaard Brouer } 74445264778SVladimir Davydov 74510befea9SRoman Gushchin memcg_slab_post_alloc_hook(s, objcg, flags, size, p); 74611c7aec2SJesper Dangaard Brouer } 74711c7aec2SJesper Dangaard Brouer 74844c5356fSChristoph Lameter #ifndef CONFIG_SLOB 749ca34956bSChristoph Lameter /* 750ca34956bSChristoph Lameter * The slab lists for all objects. 751ca34956bSChristoph Lameter */ 752ca34956bSChristoph Lameter struct kmem_cache_node { 753ca34956bSChristoph Lameter spinlock_t list_lock; 754ca34956bSChristoph Lameter 755ca34956bSChristoph Lameter #ifdef CONFIG_SLAB 756ca34956bSChristoph Lameter struct list_head slabs_partial; /* partial list first, better asm code */ 757ca34956bSChristoph Lameter struct list_head slabs_full; 758ca34956bSChristoph Lameter struct list_head slabs_free; 759bf00bd34SDavid Rientjes unsigned long total_slabs; /* length of all slab lists */ 760bf00bd34SDavid Rientjes unsigned long free_slabs; /* length of free slab list only */ 761ca34956bSChristoph Lameter unsigned long free_objects; 762ca34956bSChristoph Lameter unsigned int free_limit; 763ca34956bSChristoph Lameter unsigned int colour_next; /* Per-node cache coloring */ 764ca34956bSChristoph Lameter struct array_cache *shared; /* shared per node */ 765c8522a3aSJoonsoo Kim struct alien_cache **alien; /* on other nodes */ 766ca34956bSChristoph Lameter unsigned long next_reap; /* updated without locking */ 767ca34956bSChristoph Lameter int free_touched; /* updated without locking */ 768ca34956bSChristoph Lameter #endif 769ca34956bSChristoph Lameter 770ca34956bSChristoph Lameter #ifdef CONFIG_SLUB 771ca34956bSChristoph Lameter unsigned long nr_partial; 772ca34956bSChristoph Lameter struct list_head partial; 773ca34956bSChristoph Lameter #ifdef CONFIG_SLUB_DEBUG 774ca34956bSChristoph Lameter atomic_long_t nr_slabs; 775ca34956bSChristoph Lameter atomic_long_t total_objects; 776ca34956bSChristoph Lameter struct list_head full; 777ca34956bSChristoph Lameter #endif 778ca34956bSChristoph Lameter #endif 779ca34956bSChristoph Lameter 780ca34956bSChristoph Lameter }; 781e25839f6SWanpeng Li 78244c5356fSChristoph Lameter static inline struct kmem_cache_node *get_node(struct kmem_cache *s, int node) 78344c5356fSChristoph Lameter { 78444c5356fSChristoph Lameter return s->node[node]; 78544c5356fSChristoph Lameter } 78644c5356fSChristoph Lameter 78744c5356fSChristoph Lameter /* 78844c5356fSChristoph Lameter * Iterator over all nodes. The body will be executed for each node that has 78944c5356fSChristoph Lameter * a kmem_cache_node structure allocated (which is true for all online nodes) 79044c5356fSChristoph Lameter */ 79144c5356fSChristoph Lameter #define for_each_kmem_cache_node(__s, __node, __n) \ 7929163582cSMikulas Patocka for (__node = 0; __node < nr_node_ids; __node++) \ 7939163582cSMikulas Patocka if ((__n = get_node(__s, __node))) 79444c5356fSChristoph Lameter 79544c5356fSChristoph Lameter #endif 79644c5356fSChristoph Lameter 7971df3b26fSVladimir Davydov void *slab_start(struct seq_file *m, loff_t *pos); 798276a2439SWanpeng Li void *slab_next(struct seq_file *m, void *p, loff_t *pos); 799276a2439SWanpeng Li void slab_stop(struct seq_file *m, void *p); 800b047501cSVladimir Davydov int memcg_slab_show(struct seq_file *m, void *p); 8015240ab40SAndrey Ryabinin 802852d8be0SYang Shi #if defined(CONFIG_SLAB) || defined(CONFIG_SLUB_DEBUG) 803852d8be0SYang Shi void dump_unreclaimable_slab(void); 804852d8be0SYang Shi #else 805852d8be0SYang Shi static inline void dump_unreclaimable_slab(void) 806852d8be0SYang Shi { 807852d8be0SYang Shi } 808852d8be0SYang Shi #endif 809852d8be0SYang Shi 81055834c59SAlexander Potapenko void ___cache_free(struct kmem_cache *cache, void *x, unsigned long addr); 81155834c59SAlexander Potapenko 8127c00fce9SThomas Garnier #ifdef CONFIG_SLAB_FREELIST_RANDOM 8137c00fce9SThomas Garnier int cache_random_seq_create(struct kmem_cache *cachep, unsigned int count, 8147c00fce9SThomas Garnier gfp_t gfp); 8157c00fce9SThomas Garnier void cache_random_seq_destroy(struct kmem_cache *cachep); 8167c00fce9SThomas Garnier #else 8177c00fce9SThomas Garnier static inline int cache_random_seq_create(struct kmem_cache *cachep, 8187c00fce9SThomas Garnier unsigned int count, gfp_t gfp) 8197c00fce9SThomas Garnier { 8207c00fce9SThomas Garnier return 0; 8217c00fce9SThomas Garnier } 8227c00fce9SThomas Garnier static inline void cache_random_seq_destroy(struct kmem_cache *cachep) { } 8237c00fce9SThomas Garnier #endif /* CONFIG_SLAB_FREELIST_RANDOM */ 8247c00fce9SThomas Garnier 8256471384aSAlexander Potapenko static inline bool slab_want_init_on_alloc(gfp_t flags, struct kmem_cache *c) 8266471384aSAlexander Potapenko { 82751cba1ebSKees Cook if (static_branch_maybe(CONFIG_INIT_ON_ALLOC_DEFAULT_ON, 82851cba1ebSKees Cook &init_on_alloc)) { 8296471384aSAlexander Potapenko if (c->ctor) 8306471384aSAlexander Potapenko return false; 8316471384aSAlexander Potapenko if (c->flags & (SLAB_TYPESAFE_BY_RCU | SLAB_POISON)) 8326471384aSAlexander Potapenko return flags & __GFP_ZERO; 8336471384aSAlexander Potapenko return true; 8346471384aSAlexander Potapenko } 8356471384aSAlexander Potapenko return flags & __GFP_ZERO; 8366471384aSAlexander Potapenko } 8376471384aSAlexander Potapenko 8386471384aSAlexander Potapenko static inline bool slab_want_init_on_free(struct kmem_cache *c) 8396471384aSAlexander Potapenko { 84051cba1ebSKees Cook if (static_branch_maybe(CONFIG_INIT_ON_FREE_DEFAULT_ON, 84151cba1ebSKees Cook &init_on_free)) 8426471384aSAlexander Potapenko return !(c->ctor || 8436471384aSAlexander Potapenko (c->flags & (SLAB_TYPESAFE_BY_RCU | SLAB_POISON))); 8446471384aSAlexander Potapenko return false; 8456471384aSAlexander Potapenko } 8466471384aSAlexander Potapenko 84764dd6849SFaiyaz Mohammed #if defined(CONFIG_DEBUG_FS) && defined(CONFIG_SLUB_DEBUG) 84864dd6849SFaiyaz Mohammed void debugfs_slab_release(struct kmem_cache *); 84964dd6849SFaiyaz Mohammed #else 85064dd6849SFaiyaz Mohammed static inline void debugfs_slab_release(struct kmem_cache *s) { } 85164dd6849SFaiyaz Mohammed #endif 85264dd6849SFaiyaz Mohammed 8535bb1bb35SPaul E. McKenney #ifdef CONFIG_PRINTK 8548e7f37f2SPaul E. McKenney #define KS_ADDRS_COUNT 16 8558e7f37f2SPaul E. McKenney struct kmem_obj_info { 8568e7f37f2SPaul E. McKenney void *kp_ptr; 8577213230aSMatthew Wilcox (Oracle) struct slab *kp_slab; 8588e7f37f2SPaul E. McKenney void *kp_objp; 8598e7f37f2SPaul E. McKenney unsigned long kp_data_offset; 8608e7f37f2SPaul E. McKenney struct kmem_cache *kp_slab_cache; 8618e7f37f2SPaul E. McKenney void *kp_ret; 8628e7f37f2SPaul E. McKenney void *kp_stack[KS_ADDRS_COUNT]; 863e548eaa1SManinder Singh void *kp_free_stack[KS_ADDRS_COUNT]; 8648e7f37f2SPaul E. McKenney }; 8657213230aSMatthew Wilcox (Oracle) void kmem_obj_info(struct kmem_obj_info *kpp, void *object, struct slab *slab); 8665bb1bb35SPaul E. McKenney #endif 8678e7f37f2SPaul E. McKenney 8680b3eb091SMatthew Wilcox (Oracle) #ifdef CONFIG_HAVE_HARDENED_USERCOPY_ALLOCATOR 8690b3eb091SMatthew Wilcox (Oracle) void __check_heap_object(const void *ptr, unsigned long n, 8700b3eb091SMatthew Wilcox (Oracle) const struct slab *slab, bool to_user); 8710b3eb091SMatthew Wilcox (Oracle) #else 8720b3eb091SMatthew Wilcox (Oracle) static inline 8730b3eb091SMatthew Wilcox (Oracle) void __check_heap_object(const void *ptr, unsigned long n, 8740b3eb091SMatthew Wilcox (Oracle) const struct slab *slab, bool to_user) 8750b3eb091SMatthew Wilcox (Oracle) { 8760b3eb091SMatthew Wilcox (Oracle) } 8770b3eb091SMatthew Wilcox (Oracle) #endif 8780b3eb091SMatthew Wilcox (Oracle) 8795240ab40SAndrey Ryabinin #endif /* MM_SLAB_H */ 880