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; 289c01e9afSVlastimil 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) }; 339c01e9afSVlastimil 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 */ 53b01af5c0SHyeonggon Yoo long units; 54b01af5c0SHyeonggon Yoo unsigned int __unused_2; 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 */ 70401fb12cSVlastimil Babka #ifndef CONFIG_SLOB 71d122019bSMatthew Wilcox (Oracle) SLAB_MATCH(rcu_head, rcu_head); 72401fb12cSVlastimil Babka #endif 73d122019bSMatthew Wilcox (Oracle) SLAB_MATCH(_refcount, __page_refcount); 74d122019bSMatthew Wilcox (Oracle) #ifdef CONFIG_MEMCG 75d122019bSMatthew Wilcox (Oracle) SLAB_MATCH(memcg_data, memcg_data); 76d122019bSMatthew Wilcox (Oracle) #endif 77d122019bSMatthew Wilcox (Oracle) #undef SLAB_MATCH 78d122019bSMatthew Wilcox (Oracle) static_assert(sizeof(struct slab) <= sizeof(struct page)); 79d122019bSMatthew Wilcox (Oracle) 80d122019bSMatthew Wilcox (Oracle) /** 81d122019bSMatthew Wilcox (Oracle) * folio_slab - Converts from folio to slab. 82d122019bSMatthew Wilcox (Oracle) * @folio: The folio. 83d122019bSMatthew Wilcox (Oracle) * 84d122019bSMatthew Wilcox (Oracle) * Currently struct slab is a different representation of a folio where 85d122019bSMatthew Wilcox (Oracle) * folio_test_slab() is true. 86d122019bSMatthew Wilcox (Oracle) * 87d122019bSMatthew Wilcox (Oracle) * Return: The slab which contains this folio. 88d122019bSMatthew Wilcox (Oracle) */ 89d122019bSMatthew Wilcox (Oracle) #define folio_slab(folio) (_Generic((folio), \ 90d122019bSMatthew Wilcox (Oracle) const struct folio *: (const struct slab *)(folio), \ 91d122019bSMatthew Wilcox (Oracle) struct folio *: (struct slab *)(folio))) 92d122019bSMatthew Wilcox (Oracle) 93d122019bSMatthew Wilcox (Oracle) /** 94d122019bSMatthew Wilcox (Oracle) * slab_folio - The folio allocated for a slab 95d122019bSMatthew Wilcox (Oracle) * @slab: The slab. 96d122019bSMatthew Wilcox (Oracle) * 97d122019bSMatthew Wilcox (Oracle) * Slabs are allocated as folios that contain the individual objects and are 98d122019bSMatthew Wilcox (Oracle) * using some fields in the first struct page of the folio - those fields are 99d122019bSMatthew Wilcox (Oracle) * now accessed by struct slab. It is occasionally necessary to convert back to 100d122019bSMatthew Wilcox (Oracle) * a folio in order to communicate with the rest of the mm. Please use this 101d122019bSMatthew Wilcox (Oracle) * helper function instead of casting yourself, as the implementation may change 102d122019bSMatthew Wilcox (Oracle) * in the future. 103d122019bSMatthew Wilcox (Oracle) */ 104d122019bSMatthew Wilcox (Oracle) #define slab_folio(s) (_Generic((s), \ 105d122019bSMatthew Wilcox (Oracle) const struct slab *: (const struct folio *)s, \ 106d122019bSMatthew Wilcox (Oracle) struct slab *: (struct folio *)s)) 107d122019bSMatthew Wilcox (Oracle) 108d122019bSMatthew Wilcox (Oracle) /** 109d122019bSMatthew Wilcox (Oracle) * page_slab - Converts from first struct page to slab. 110d122019bSMatthew Wilcox (Oracle) * @p: The first (either head of compound or single) page of slab. 111d122019bSMatthew Wilcox (Oracle) * 112d122019bSMatthew Wilcox (Oracle) * A temporary wrapper to convert struct page to struct slab in situations where 113d122019bSMatthew Wilcox (Oracle) * we know the page is the compound head, or single order-0 page. 114d122019bSMatthew Wilcox (Oracle) * 115d122019bSMatthew Wilcox (Oracle) * Long-term ideally everything would work with struct slab directly or go 116d122019bSMatthew Wilcox (Oracle) * through folio to struct slab. 117d122019bSMatthew Wilcox (Oracle) * 118d122019bSMatthew Wilcox (Oracle) * Return: The slab which contains this page 119d122019bSMatthew Wilcox (Oracle) */ 120d122019bSMatthew Wilcox (Oracle) #define page_slab(p) (_Generic((p), \ 121d122019bSMatthew Wilcox (Oracle) const struct page *: (const struct slab *)(p), \ 122d122019bSMatthew Wilcox (Oracle) struct page *: (struct slab *)(p))) 123d122019bSMatthew Wilcox (Oracle) 124d122019bSMatthew Wilcox (Oracle) /** 125d122019bSMatthew Wilcox (Oracle) * slab_page - The first struct page allocated for a slab 126d122019bSMatthew Wilcox (Oracle) * @slab: The slab. 127d122019bSMatthew Wilcox (Oracle) * 128d122019bSMatthew Wilcox (Oracle) * A convenience wrapper for converting slab to the first struct page of the 129d122019bSMatthew Wilcox (Oracle) * underlying folio, to communicate with code not yet converted to folio or 130d122019bSMatthew Wilcox (Oracle) * struct slab. 131d122019bSMatthew Wilcox (Oracle) */ 132d122019bSMatthew Wilcox (Oracle) #define slab_page(s) folio_page(slab_folio(s), 0) 133d122019bSMatthew Wilcox (Oracle) 134d122019bSMatthew Wilcox (Oracle) /* 135d122019bSMatthew Wilcox (Oracle) * If network-based swap is enabled, sl*b must keep track of whether pages 136d122019bSMatthew Wilcox (Oracle) * were allocated from pfmemalloc reserves. 137d122019bSMatthew Wilcox (Oracle) */ 138d122019bSMatthew Wilcox (Oracle) static inline bool slab_test_pfmemalloc(const struct slab *slab) 139d122019bSMatthew Wilcox (Oracle) { 140d122019bSMatthew Wilcox (Oracle) return folio_test_active((struct folio *)slab_folio(slab)); 141d122019bSMatthew Wilcox (Oracle) } 142d122019bSMatthew Wilcox (Oracle) 143d122019bSMatthew Wilcox (Oracle) static inline void slab_set_pfmemalloc(struct slab *slab) 144d122019bSMatthew Wilcox (Oracle) { 145d122019bSMatthew Wilcox (Oracle) folio_set_active(slab_folio(slab)); 146d122019bSMatthew Wilcox (Oracle) } 147d122019bSMatthew Wilcox (Oracle) 148d122019bSMatthew Wilcox (Oracle) static inline void slab_clear_pfmemalloc(struct slab *slab) 149d122019bSMatthew Wilcox (Oracle) { 150d122019bSMatthew Wilcox (Oracle) folio_clear_active(slab_folio(slab)); 151d122019bSMatthew Wilcox (Oracle) } 152d122019bSMatthew Wilcox (Oracle) 153d122019bSMatthew Wilcox (Oracle) static inline void __slab_clear_pfmemalloc(struct slab *slab) 154d122019bSMatthew Wilcox (Oracle) { 155d122019bSMatthew Wilcox (Oracle) __folio_clear_active(slab_folio(slab)); 156d122019bSMatthew Wilcox (Oracle) } 157d122019bSMatthew Wilcox (Oracle) 158d122019bSMatthew Wilcox (Oracle) static inline void *slab_address(const struct slab *slab) 159d122019bSMatthew Wilcox (Oracle) { 160d122019bSMatthew Wilcox (Oracle) return folio_address(slab_folio(slab)); 161d122019bSMatthew Wilcox (Oracle) } 162d122019bSMatthew Wilcox (Oracle) 163d122019bSMatthew Wilcox (Oracle) static inline int slab_nid(const struct slab *slab) 164d122019bSMatthew Wilcox (Oracle) { 165d122019bSMatthew Wilcox (Oracle) return folio_nid(slab_folio(slab)); 166d122019bSMatthew Wilcox (Oracle) } 167d122019bSMatthew Wilcox (Oracle) 168d122019bSMatthew Wilcox (Oracle) static inline pg_data_t *slab_pgdat(const struct slab *slab) 169d122019bSMatthew Wilcox (Oracle) { 170d122019bSMatthew Wilcox (Oracle) return folio_pgdat(slab_folio(slab)); 171d122019bSMatthew Wilcox (Oracle) } 172d122019bSMatthew Wilcox (Oracle) 173d122019bSMatthew Wilcox (Oracle) static inline struct slab *virt_to_slab(const void *addr) 174d122019bSMatthew Wilcox (Oracle) { 175d122019bSMatthew Wilcox (Oracle) struct folio *folio = virt_to_folio(addr); 176d122019bSMatthew Wilcox (Oracle) 177d122019bSMatthew Wilcox (Oracle) if (!folio_test_slab(folio)) 178d122019bSMatthew Wilcox (Oracle) return NULL; 179d122019bSMatthew Wilcox (Oracle) 180d122019bSMatthew Wilcox (Oracle) return folio_slab(folio); 181d122019bSMatthew Wilcox (Oracle) } 182d122019bSMatthew Wilcox (Oracle) 183d122019bSMatthew Wilcox (Oracle) static inline int slab_order(const struct slab *slab) 184d122019bSMatthew Wilcox (Oracle) { 185d122019bSMatthew Wilcox (Oracle) return folio_order((struct folio *)slab_folio(slab)); 186d122019bSMatthew Wilcox (Oracle) } 187d122019bSMatthew Wilcox (Oracle) 188d122019bSMatthew Wilcox (Oracle) static inline size_t slab_size(const struct slab *slab) 189d122019bSMatthew Wilcox (Oracle) { 190d122019bSMatthew Wilcox (Oracle) return PAGE_SIZE << slab_order(slab); 191d122019bSMatthew Wilcox (Oracle) } 192d122019bSMatthew Wilcox (Oracle) 19307f361b2SJoonsoo Kim #ifdef CONFIG_SLOB 19407f361b2SJoonsoo Kim /* 19507f361b2SJoonsoo Kim * Common fields provided in kmem_cache by all slab allocators 19607f361b2SJoonsoo Kim * This struct is either used directly by the allocator (SLOB) 19707f361b2SJoonsoo Kim * or the allocator must include definitions for all fields 19807f361b2SJoonsoo Kim * provided in kmem_cache_common in their definition of kmem_cache. 19907f361b2SJoonsoo Kim * 20007f361b2SJoonsoo Kim * Once we can do anonymous structs (C11 standard) we could put a 20107f361b2SJoonsoo Kim * anonymous struct definition in these allocators so that the 20207f361b2SJoonsoo Kim * separate allocations in the kmem_cache structure of SLAB and 20307f361b2SJoonsoo Kim * SLUB is no longer needed. 20407f361b2SJoonsoo Kim */ 20507f361b2SJoonsoo Kim struct kmem_cache { 20607f361b2SJoonsoo Kim unsigned int object_size;/* The original size of the object */ 20707f361b2SJoonsoo Kim unsigned int size; /* The aligned/padded/added on size */ 20807f361b2SJoonsoo Kim unsigned int align; /* Alignment as calculated */ 209d50112edSAlexey Dobriyan slab_flags_t flags; /* Active flags on the slab */ 2107bbdb81eSAlexey Dobriyan unsigned int useroffset;/* Usercopy region offset */ 2117bbdb81eSAlexey Dobriyan unsigned int usersize; /* Usercopy region size */ 21207f361b2SJoonsoo Kim const char *name; /* Slab name for sysfs */ 21307f361b2SJoonsoo Kim int refcount; /* Use counter */ 21407f361b2SJoonsoo Kim void (*ctor)(void *); /* Called on object slot creation */ 21507f361b2SJoonsoo Kim struct list_head list; /* List of all slab caches on the system */ 21607f361b2SJoonsoo Kim }; 21707f361b2SJoonsoo Kim 21807f361b2SJoonsoo Kim #endif /* CONFIG_SLOB */ 21907f361b2SJoonsoo Kim 22007f361b2SJoonsoo Kim #ifdef CONFIG_SLAB 22107f361b2SJoonsoo Kim #include <linux/slab_def.h> 22207f361b2SJoonsoo Kim #endif 22307f361b2SJoonsoo Kim 22407f361b2SJoonsoo Kim #ifdef CONFIG_SLUB 22507f361b2SJoonsoo Kim #include <linux/slub_def.h> 22607f361b2SJoonsoo Kim #endif 22707f361b2SJoonsoo Kim 22807f361b2SJoonsoo Kim #include <linux/memcontrol.h> 22911c7aec2SJesper Dangaard Brouer #include <linux/fault-inject.h> 23011c7aec2SJesper Dangaard Brouer #include <linux/kasan.h> 23111c7aec2SJesper Dangaard Brouer #include <linux/kmemleak.h> 2327c00fce9SThomas Garnier #include <linux/random.h> 233d92a8cfcSPeter Zijlstra #include <linux/sched/mm.h> 23488f2ef73SMuchun Song #include <linux/list_lru.h> 23507f361b2SJoonsoo Kim 23697d06609SChristoph Lameter /* 23797d06609SChristoph Lameter * State of the slab allocator. 23897d06609SChristoph Lameter * 23997d06609SChristoph Lameter * This is used to describe the states of the allocator during bootup. 24097d06609SChristoph Lameter * Allocators use this to gradually bootstrap themselves. Most allocators 24197d06609SChristoph Lameter * have the problem that the structures used for managing slab caches are 24297d06609SChristoph Lameter * allocated from slab caches themselves. 24397d06609SChristoph Lameter */ 24497d06609SChristoph Lameter enum slab_state { 24597d06609SChristoph Lameter DOWN, /* No slab functionality yet */ 24697d06609SChristoph Lameter PARTIAL, /* SLUB: kmem_cache_node available */ 247ce8eb6c4SChristoph Lameter PARTIAL_NODE, /* SLAB: kmalloc size for node struct available */ 24897d06609SChristoph Lameter UP, /* Slab caches usable but not all extras yet */ 24997d06609SChristoph Lameter FULL /* Everything is working */ 25097d06609SChristoph Lameter }; 25197d06609SChristoph Lameter 25297d06609SChristoph Lameter extern enum slab_state slab_state; 25397d06609SChristoph Lameter 25418004c5dSChristoph Lameter /* The slab cache mutex protects the management structures during changes */ 25518004c5dSChristoph Lameter extern struct mutex slab_mutex; 2569b030cb8SChristoph Lameter 2579b030cb8SChristoph Lameter /* The list of all slab caches on the system */ 25818004c5dSChristoph Lameter extern struct list_head slab_caches; 25918004c5dSChristoph Lameter 2609b030cb8SChristoph Lameter /* The slab cache that manages slab cache information */ 2619b030cb8SChristoph Lameter extern struct kmem_cache *kmem_cache; 2629b030cb8SChristoph Lameter 263af3b5f87SVlastimil Babka /* A table of kmalloc cache names and sizes */ 264af3b5f87SVlastimil Babka extern const struct kmalloc_info_struct { 265cb5d9fb3SPengfei Li const char *name[NR_KMALLOC_TYPES]; 26655de8b9cSAlexey Dobriyan unsigned int size; 267af3b5f87SVlastimil Babka } kmalloc_info[]; 268af3b5f87SVlastimil Babka 269f97d5f63SChristoph Lameter #ifndef CONFIG_SLOB 270f97d5f63SChristoph Lameter /* Kmalloc array related functions */ 27134cc6990SDaniel Sanders void setup_kmalloc_cache_index_table(void); 272d50112edSAlexey Dobriyan void create_kmalloc_caches(slab_flags_t); 2732c59dd65SChristoph Lameter 2742c59dd65SChristoph Lameter /* Find the kmalloc slab corresponding for a certain size */ 2752c59dd65SChristoph Lameter struct kmem_cache *kmalloc_slab(size_t, gfp_t); 276ed4cd17eSHyeonggon Yoo 277ed4cd17eSHyeonggon Yoo void *__kmem_cache_alloc_node(struct kmem_cache *s, gfp_t gfpflags, 278ed4cd17eSHyeonggon Yoo int node, size_t orig_size, 279ed4cd17eSHyeonggon Yoo unsigned long caller); 280ed4cd17eSHyeonggon Yoo void __kmem_cache_free(struct kmem_cache *s, void *x, unsigned long caller); 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 | \ 339*6cd6d33cSFeng Tang SLAB_TEMPORARY | SLAB_ACCOUNT | \ 340*6cd6d33cSFeng Tang SLAB_NO_USER_FLAGS | SLAB_KMALLOC) 341d8843922SGlauber Costa #else 34234dbc3aaSRustam Kovhaev #define SLAB_CACHE_FLAGS (SLAB_NOLEAKTRACE) 343d8843922SGlauber Costa #endif 344d8843922SGlauber Costa 345e70954fdSThomas Garnier /* Common flags available with current configuration */ 346d8843922SGlauber Costa #define CACHE_CREATE_MASK (SLAB_CORE_FLAGS | SLAB_DEBUG_FLAGS | SLAB_CACHE_FLAGS) 347d8843922SGlauber Costa 348e70954fdSThomas Garnier /* Common flags permitted for kmem_cache_create */ 349e70954fdSThomas Garnier #define SLAB_FLAGS_PERMITTED (SLAB_CORE_FLAGS | \ 350e70954fdSThomas Garnier SLAB_RED_ZONE | \ 351e70954fdSThomas Garnier SLAB_POISON | \ 352e70954fdSThomas Garnier SLAB_STORE_USER | \ 353e70954fdSThomas Garnier SLAB_TRACE | \ 354e70954fdSThomas Garnier SLAB_CONSISTENCY_CHECKS | \ 355e70954fdSThomas Garnier SLAB_MEM_SPREAD | \ 356e70954fdSThomas Garnier SLAB_NOLEAKTRACE | \ 357e70954fdSThomas Garnier SLAB_RECLAIM_ACCOUNT | \ 358e70954fdSThomas Garnier SLAB_TEMPORARY | \ 359a285909fSHyeonggon Yoo SLAB_ACCOUNT | \ 360*6cd6d33cSFeng Tang SLAB_KMALLOC | \ 361a285909fSHyeonggon Yoo SLAB_NO_USER_FLAGS) 362e70954fdSThomas Garnier 363f9e13c0aSShakeel Butt bool __kmem_cache_empty(struct kmem_cache *); 364945cf2b6SChristoph Lameter int __kmem_cache_shutdown(struct kmem_cache *); 36552b4b950SDmitry Safonov void __kmem_cache_release(struct kmem_cache *); 366c9fc5864STejun Heo int __kmem_cache_shrink(struct kmem_cache *); 36741a21285SChristoph Lameter void slab_kmem_cache_release(struct kmem_cache *); 368945cf2b6SChristoph Lameter 369b7454ad3SGlauber Costa struct seq_file; 370b7454ad3SGlauber Costa struct file; 371b7454ad3SGlauber Costa 3720d7561c6SGlauber Costa struct slabinfo { 3730d7561c6SGlauber Costa unsigned long active_objs; 3740d7561c6SGlauber Costa unsigned long num_objs; 3750d7561c6SGlauber Costa unsigned long active_slabs; 3760d7561c6SGlauber Costa unsigned long num_slabs; 3770d7561c6SGlauber Costa unsigned long shared_avail; 3780d7561c6SGlauber Costa unsigned int limit; 3790d7561c6SGlauber Costa unsigned int batchcount; 3800d7561c6SGlauber Costa unsigned int shared; 3810d7561c6SGlauber Costa unsigned int objects_per_slab; 3820d7561c6SGlauber Costa unsigned int cache_order; 3830d7561c6SGlauber Costa }; 3840d7561c6SGlauber Costa 3850d7561c6SGlauber Costa void get_slabinfo(struct kmem_cache *s, struct slabinfo *sinfo); 3860d7561c6SGlauber Costa void slabinfo_show_stats(struct seq_file *m, struct kmem_cache *s); 387b7454ad3SGlauber Costa ssize_t slabinfo_write(struct file *file, const char __user *buffer, 388b7454ad3SGlauber Costa size_t count, loff_t *ppos); 389ba6c496eSGlauber Costa 3901a984c4eSMuchun Song static inline enum node_stat_item cache_vmstat_idx(struct kmem_cache *s) 3916cea1d56SRoman Gushchin { 3926cea1d56SRoman Gushchin return (s->flags & SLAB_RECLAIM_ACCOUNT) ? 393d42f3245SRoman Gushchin NR_SLAB_RECLAIMABLE_B : NR_SLAB_UNRECLAIMABLE_B; 3946cea1d56SRoman Gushchin } 3956cea1d56SRoman Gushchin 396e42f174eSVlastimil Babka #ifdef CONFIG_SLUB_DEBUG 397e42f174eSVlastimil Babka #ifdef CONFIG_SLUB_DEBUG_ON 398e42f174eSVlastimil Babka DECLARE_STATIC_KEY_TRUE(slub_debug_enabled); 399e42f174eSVlastimil Babka #else 400e42f174eSVlastimil Babka DECLARE_STATIC_KEY_FALSE(slub_debug_enabled); 401e42f174eSVlastimil Babka #endif 402e42f174eSVlastimil Babka extern void print_tracking(struct kmem_cache *s, void *object); 4031f9f78b1SOliver Glitta long validate_slab_cache(struct kmem_cache *s); 4040d4a062aSMarco Elver static inline bool __slub_debug_enabled(void) 4050d4a062aSMarco Elver { 4060d4a062aSMarco Elver return static_branch_unlikely(&slub_debug_enabled); 4070d4a062aSMarco Elver } 408e42f174eSVlastimil Babka #else 409e42f174eSVlastimil Babka static inline void print_tracking(struct kmem_cache *s, void *object) 410e42f174eSVlastimil Babka { 411e42f174eSVlastimil Babka } 4120d4a062aSMarco Elver static inline bool __slub_debug_enabled(void) 4130d4a062aSMarco Elver { 4140d4a062aSMarco Elver return false; 4150d4a062aSMarco Elver } 416e42f174eSVlastimil Babka #endif 417e42f174eSVlastimil Babka 418e42f174eSVlastimil Babka /* 419e42f174eSVlastimil Babka * Returns true if any of the specified slub_debug flags is enabled for the 420e42f174eSVlastimil Babka * cache. Use only for flags parsed by setup_slub_debug() as it also enables 421e42f174eSVlastimil Babka * the static key. 422e42f174eSVlastimil Babka */ 423e42f174eSVlastimil Babka static inline bool kmem_cache_debug_flags(struct kmem_cache *s, slab_flags_t flags) 424e42f174eSVlastimil Babka { 4250d4a062aSMarco Elver if (IS_ENABLED(CONFIG_SLUB_DEBUG)) 426e42f174eSVlastimil Babka VM_WARN_ON_ONCE(!(flags & SLAB_DEBUG_FLAGS)); 4270d4a062aSMarco Elver if (__slub_debug_enabled()) 428e42f174eSVlastimil Babka return s->flags & flags; 429e42f174eSVlastimil Babka return false; 430e42f174eSVlastimil Babka } 431e42f174eSVlastimil Babka 43284c07d11SKirill Tkhai #ifdef CONFIG_MEMCG_KMEM 4334b5f8d9aSVlastimil Babka /* 4344b5f8d9aSVlastimil Babka * slab_objcgs - get the object cgroups vector associated with a slab 4354b5f8d9aSVlastimil Babka * @slab: a pointer to the slab struct 4364b5f8d9aSVlastimil Babka * 4374b5f8d9aSVlastimil Babka * Returns a pointer to the object cgroups vector associated with the slab, 4384b5f8d9aSVlastimil Babka * or NULL if no such vector has been associated yet. 4394b5f8d9aSVlastimil Babka */ 4404b5f8d9aSVlastimil Babka static inline struct obj_cgroup **slab_objcgs(struct slab *slab) 4414b5f8d9aSVlastimil Babka { 4424b5f8d9aSVlastimil Babka unsigned long memcg_data = READ_ONCE(slab->memcg_data); 4434b5f8d9aSVlastimil Babka 4444b5f8d9aSVlastimil Babka VM_BUG_ON_PAGE(memcg_data && !(memcg_data & MEMCG_DATA_OBJCGS), 4454b5f8d9aSVlastimil Babka slab_page(slab)); 4464b5f8d9aSVlastimil Babka VM_BUG_ON_PAGE(memcg_data & MEMCG_DATA_KMEM, slab_page(slab)); 4474b5f8d9aSVlastimil Babka 4484b5f8d9aSVlastimil Babka return (struct obj_cgroup **)(memcg_data & ~MEMCG_DATA_FLAGS_MASK); 4494b5f8d9aSVlastimil Babka } 4504b5f8d9aSVlastimil Babka 4514b5f8d9aSVlastimil Babka int memcg_alloc_slab_cgroups(struct slab *slab, struct kmem_cache *s, 4524b5f8d9aSVlastimil Babka gfp_t gfp, bool new_slab); 453fdbcb2a6SWaiman Long void mod_objcg_state(struct obj_cgroup *objcg, struct pglist_data *pgdat, 454fdbcb2a6SWaiman Long enum node_stat_item idx, int nr); 455286e04b8SRoman Gushchin 4564b5f8d9aSVlastimil Babka static inline void memcg_free_slab_cgroups(struct slab *slab) 457286e04b8SRoman Gushchin { 4584b5f8d9aSVlastimil Babka kfree(slab_objcgs(slab)); 4594b5f8d9aSVlastimil Babka slab->memcg_data = 0; 460286e04b8SRoman Gushchin } 461286e04b8SRoman Gushchin 462f2fe7b09SRoman Gushchin static inline size_t obj_full_size(struct kmem_cache *s) 463f2fe7b09SRoman Gushchin { 464f2fe7b09SRoman Gushchin /* 465f2fe7b09SRoman Gushchin * For each accounted object there is an extra space which is used 466f2fe7b09SRoman Gushchin * to store obj_cgroup membership. Charge it too. 467f2fe7b09SRoman Gushchin */ 468f2fe7b09SRoman Gushchin return s->size + sizeof(struct obj_cgroup *); 469f2fe7b09SRoman Gushchin } 470f2fe7b09SRoman Gushchin 471becaba65SRoman Gushchin /* 472becaba65SRoman Gushchin * Returns false if the allocation should fail. 473becaba65SRoman Gushchin */ 474becaba65SRoman Gushchin static inline bool memcg_slab_pre_alloc_hook(struct kmem_cache *s, 47588f2ef73SMuchun Song struct list_lru *lru, 476becaba65SRoman Gushchin struct obj_cgroup **objcgp, 477becaba65SRoman Gushchin size_t objects, gfp_t flags) 478f2fe7b09SRoman Gushchin { 4799855609bSRoman Gushchin struct obj_cgroup *objcg; 480f2fe7b09SRoman Gushchin 481becaba65SRoman Gushchin if (!memcg_kmem_enabled()) 482becaba65SRoman Gushchin return true; 483becaba65SRoman Gushchin 484becaba65SRoman Gushchin if (!(flags & __GFP_ACCOUNT) && !(s->flags & SLAB_ACCOUNT)) 485becaba65SRoman Gushchin return true; 486becaba65SRoman Gushchin 4879855609bSRoman Gushchin objcg = get_obj_cgroup_from_current(); 4889855609bSRoman Gushchin if (!objcg) 489becaba65SRoman Gushchin return true; 4909855609bSRoman Gushchin 49188f2ef73SMuchun Song if (lru) { 49288f2ef73SMuchun Song int ret; 49388f2ef73SMuchun Song struct mem_cgroup *memcg; 49488f2ef73SMuchun Song 49588f2ef73SMuchun Song memcg = get_mem_cgroup_from_objcg(objcg); 49688f2ef73SMuchun Song ret = memcg_list_lru_alloc(memcg, lru, flags); 49788f2ef73SMuchun Song css_put(&memcg->css); 49888f2ef73SMuchun Song 49988f2ef73SMuchun Song if (ret) 50088f2ef73SMuchun Song goto out; 501f2fe7b09SRoman Gushchin } 502f2fe7b09SRoman Gushchin 50388f2ef73SMuchun Song if (obj_cgroup_charge(objcg, flags, objects * obj_full_size(s))) 50488f2ef73SMuchun Song goto out; 50588f2ef73SMuchun Song 506becaba65SRoman Gushchin *objcgp = objcg; 507becaba65SRoman Gushchin return true; 50888f2ef73SMuchun Song out: 50988f2ef73SMuchun Song obj_cgroup_put(objcg); 51088f2ef73SMuchun Song return false; 511f2fe7b09SRoman Gushchin } 512f2fe7b09SRoman Gushchin 513964d4bd3SRoman Gushchin static inline void memcg_slab_post_alloc_hook(struct kmem_cache *s, 514964d4bd3SRoman Gushchin struct obj_cgroup *objcg, 51510befea9SRoman Gushchin gfp_t flags, size_t size, 51610befea9SRoman Gushchin void **p) 517964d4bd3SRoman Gushchin { 5184b5f8d9aSVlastimil Babka struct slab *slab; 519964d4bd3SRoman Gushchin unsigned long off; 520964d4bd3SRoman Gushchin size_t i; 521964d4bd3SRoman Gushchin 522becaba65SRoman Gushchin if (!memcg_kmem_enabled() || !objcg) 52310befea9SRoman Gushchin return; 52410befea9SRoman Gushchin 525964d4bd3SRoman Gushchin for (i = 0; i < size; i++) { 526964d4bd3SRoman Gushchin if (likely(p[i])) { 5274b5f8d9aSVlastimil Babka slab = virt_to_slab(p[i]); 52810befea9SRoman Gushchin 5294b5f8d9aSVlastimil Babka if (!slab_objcgs(slab) && 5304b5f8d9aSVlastimil Babka memcg_alloc_slab_cgroups(slab, s, flags, 5312e9bd483SRoman Gushchin false)) { 53210befea9SRoman Gushchin obj_cgroup_uncharge(objcg, obj_full_size(s)); 53310befea9SRoman Gushchin continue; 53410befea9SRoman Gushchin } 53510befea9SRoman Gushchin 5364b5f8d9aSVlastimil Babka off = obj_to_index(s, slab, p[i]); 537964d4bd3SRoman Gushchin obj_cgroup_get(objcg); 5384b5f8d9aSVlastimil Babka slab_objcgs(slab)[off] = objcg; 5394b5f8d9aSVlastimil Babka mod_objcg_state(objcg, slab_pgdat(slab), 540f2fe7b09SRoman Gushchin cache_vmstat_idx(s), obj_full_size(s)); 541f2fe7b09SRoman Gushchin } else { 542f2fe7b09SRoman Gushchin obj_cgroup_uncharge(objcg, obj_full_size(s)); 543964d4bd3SRoman Gushchin } 544964d4bd3SRoman Gushchin } 545964d4bd3SRoman Gushchin obj_cgroup_put(objcg); 546964d4bd3SRoman Gushchin } 547964d4bd3SRoman Gushchin 548b77d5b1bSMuchun Song static inline void memcg_slab_free_hook(struct kmem_cache *s, struct slab *slab, 549d1b2cf6cSBharata B Rao void **p, int objects) 550964d4bd3SRoman Gushchin { 551270c6a71SRoman Gushchin struct obj_cgroup **objcgs; 552d1b2cf6cSBharata B Rao int i; 553964d4bd3SRoman Gushchin 55410befea9SRoman Gushchin if (!memcg_kmem_enabled()) 55510befea9SRoman Gushchin return; 55610befea9SRoman Gushchin 5574b5f8d9aSVlastimil Babka objcgs = slab_objcgs(slab); 558270c6a71SRoman Gushchin if (!objcgs) 559b77d5b1bSMuchun Song return; 560964d4bd3SRoman Gushchin 561b77d5b1bSMuchun Song for (i = 0; i < objects; i++) { 562b77d5b1bSMuchun Song struct obj_cgroup *objcg; 563b77d5b1bSMuchun Song unsigned int off; 564d1b2cf6cSBharata B Rao 5654b5f8d9aSVlastimil Babka off = obj_to_index(s, slab, p[i]); 566270c6a71SRoman Gushchin objcg = objcgs[off]; 56710befea9SRoman Gushchin if (!objcg) 568d1b2cf6cSBharata B Rao continue; 56910befea9SRoman Gushchin 570270c6a71SRoman Gushchin objcgs[off] = NULL; 571f2fe7b09SRoman Gushchin obj_cgroup_uncharge(objcg, obj_full_size(s)); 5724b5f8d9aSVlastimil Babka mod_objcg_state(objcg, slab_pgdat(slab), cache_vmstat_idx(s), 573f2fe7b09SRoman Gushchin -obj_full_size(s)); 574964d4bd3SRoman Gushchin obj_cgroup_put(objcg); 575964d4bd3SRoman Gushchin } 576d1b2cf6cSBharata B Rao } 577964d4bd3SRoman Gushchin 57884c07d11SKirill Tkhai #else /* CONFIG_MEMCG_KMEM */ 5794b5f8d9aSVlastimil Babka static inline struct obj_cgroup **slab_objcgs(struct slab *slab) 5804b5f8d9aSVlastimil Babka { 5814b5f8d9aSVlastimil Babka return NULL; 5824b5f8d9aSVlastimil Babka } 5834b5f8d9aSVlastimil Babka 5849855609bSRoman Gushchin static inline struct mem_cgroup *memcg_from_slab_obj(void *ptr) 5854d96ba35SRoman Gushchin { 5864d96ba35SRoman Gushchin return NULL; 5874d96ba35SRoman Gushchin } 5884d96ba35SRoman Gushchin 5894b5f8d9aSVlastimil Babka static inline int memcg_alloc_slab_cgroups(struct slab *slab, 5902e9bd483SRoman Gushchin struct kmem_cache *s, gfp_t gfp, 5914b5f8d9aSVlastimil Babka bool new_slab) 592286e04b8SRoman Gushchin { 593286e04b8SRoman Gushchin return 0; 594286e04b8SRoman Gushchin } 595286e04b8SRoman Gushchin 5964b5f8d9aSVlastimil Babka static inline void memcg_free_slab_cgroups(struct slab *slab) 597286e04b8SRoman Gushchin { 598286e04b8SRoman Gushchin } 599286e04b8SRoman Gushchin 600becaba65SRoman Gushchin static inline bool memcg_slab_pre_alloc_hook(struct kmem_cache *s, 60188f2ef73SMuchun Song struct list_lru *lru, 602becaba65SRoman Gushchin struct obj_cgroup **objcgp, 603becaba65SRoman Gushchin size_t objects, gfp_t flags) 604f2fe7b09SRoman Gushchin { 605becaba65SRoman Gushchin return true; 606f2fe7b09SRoman Gushchin } 607f2fe7b09SRoman Gushchin 608964d4bd3SRoman Gushchin static inline void memcg_slab_post_alloc_hook(struct kmem_cache *s, 609964d4bd3SRoman Gushchin struct obj_cgroup *objcg, 61010befea9SRoman Gushchin gfp_t flags, size_t size, 61110befea9SRoman Gushchin void **p) 612964d4bd3SRoman Gushchin { 613964d4bd3SRoman Gushchin } 614964d4bd3SRoman Gushchin 615b77d5b1bSMuchun Song static inline void memcg_slab_free_hook(struct kmem_cache *s, struct slab *slab, 616d1b2cf6cSBharata B Rao void **p, int objects) 617964d4bd3SRoman Gushchin { 618964d4bd3SRoman Gushchin } 61984c07d11SKirill Tkhai #endif /* CONFIG_MEMCG_KMEM */ 620b9ce5ef4SGlauber Costa 621401fb12cSVlastimil Babka #ifndef CONFIG_SLOB 622a64b5378SKees Cook static inline struct kmem_cache *virt_to_cache(const void *obj) 623a64b5378SKees Cook { 62482c1775dSMatthew Wilcox (Oracle) struct slab *slab; 625a64b5378SKees Cook 62682c1775dSMatthew Wilcox (Oracle) slab = virt_to_slab(obj); 62782c1775dSMatthew Wilcox (Oracle) if (WARN_ONCE(!slab, "%s: Object is not a Slab page!\n", 628a64b5378SKees Cook __func__)) 629a64b5378SKees Cook return NULL; 63082c1775dSMatthew Wilcox (Oracle) return slab->slab_cache; 631a64b5378SKees Cook } 632a64b5378SKees Cook 633b918653bSMatthew Wilcox (Oracle) static __always_inline void account_slab(struct slab *slab, int order, 634b918653bSMatthew Wilcox (Oracle) struct kmem_cache *s, gfp_t gfp) 6356cea1d56SRoman Gushchin { 6362e9bd483SRoman Gushchin if (memcg_kmem_enabled() && (s->flags & SLAB_ACCOUNT)) 6374b5f8d9aSVlastimil Babka memcg_alloc_slab_cgroups(slab, s, gfp, true); 6382e9bd483SRoman Gushchin 639b918653bSMatthew Wilcox (Oracle) mod_node_page_state(slab_pgdat(slab), cache_vmstat_idx(s), 640f2fe7b09SRoman Gushchin PAGE_SIZE << order); 6416cea1d56SRoman Gushchin } 6426cea1d56SRoman Gushchin 643b918653bSMatthew Wilcox (Oracle) static __always_inline void unaccount_slab(struct slab *slab, int order, 6446cea1d56SRoman Gushchin struct kmem_cache *s) 6456cea1d56SRoman Gushchin { 64610befea9SRoman Gushchin if (memcg_kmem_enabled()) 6474b5f8d9aSVlastimil Babka memcg_free_slab_cgroups(slab); 6489855609bSRoman Gushchin 649b918653bSMatthew Wilcox (Oracle) mod_node_page_state(slab_pgdat(slab), cache_vmstat_idx(s), 650d42f3245SRoman Gushchin -(PAGE_SIZE << order)); 6516cea1d56SRoman Gushchin } 6526cea1d56SRoman Gushchin 653e42f174eSVlastimil Babka static inline struct kmem_cache *cache_from_obj(struct kmem_cache *s, void *x) 654e42f174eSVlastimil Babka { 655e42f174eSVlastimil Babka struct kmem_cache *cachep; 656e42f174eSVlastimil Babka 657e42f174eSVlastimil Babka if (!IS_ENABLED(CONFIG_SLAB_FREELIST_HARDENED) && 658e42f174eSVlastimil Babka !kmem_cache_debug_flags(s, SLAB_CONSISTENCY_CHECKS)) 659e42f174eSVlastimil Babka return s; 660e42f174eSVlastimil Babka 661e42f174eSVlastimil Babka cachep = virt_to_cache(x); 66210befea9SRoman Gushchin if (WARN(cachep && cachep != s, 663e42f174eSVlastimil Babka "%s: Wrong slab cache. %s but object is from %s\n", 664e42f174eSVlastimil Babka __func__, s->name, cachep->name)) 665e42f174eSVlastimil Babka print_tracking(cachep, x); 666e42f174eSVlastimil Babka return cachep; 667e42f174eSVlastimil Babka } 668d6a71648SHyeonggon Yoo 669d6a71648SHyeonggon Yoo void free_large_kmalloc(struct folio *folio, void *object); 670d6a71648SHyeonggon Yoo 671401fb12cSVlastimil Babka #endif /* CONFIG_SLOB */ 672e42f174eSVlastimil Babka 6738dfa9d55SHyeonggon Yoo size_t __ksize(const void *objp); 6748dfa9d55SHyeonggon Yoo 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, 70688f2ef73SMuchun Song struct list_lru *lru, 707964d4bd3SRoman Gushchin struct obj_cgroup **objcgp, 708964d4bd3SRoman Gushchin size_t size, gfp_t flags) 70911c7aec2SJesper Dangaard Brouer { 71011c7aec2SJesper Dangaard Brouer flags &= gfp_allowed_mask; 711d92a8cfcSPeter Zijlstra 71295d6c701SDaniel Vetter might_alloc(flags); 71311c7aec2SJesper Dangaard Brouer 714fab9963aSJesper Dangaard Brouer if (should_failslab(s, flags)) 71511c7aec2SJesper Dangaard Brouer return NULL; 71611c7aec2SJesper Dangaard Brouer 71788f2ef73SMuchun Song if (!memcg_slab_pre_alloc_hook(s, lru, objcgp, size, flags)) 718becaba65SRoman Gushchin return NULL; 71945264778SVladimir Davydov 72045264778SVladimir Davydov return s; 72111c7aec2SJesper Dangaard Brouer } 72211c7aec2SJesper Dangaard Brouer 723964d4bd3SRoman Gushchin static inline void slab_post_alloc_hook(struct kmem_cache *s, 724da844b78SAndrey Konovalov struct obj_cgroup *objcg, gfp_t flags, 7259ce67395SFeng Tang size_t size, void **p, bool init, 7269ce67395SFeng Tang unsigned int orig_size) 72711c7aec2SJesper Dangaard Brouer { 7289ce67395SFeng Tang unsigned int zero_size = s->object_size; 72911c7aec2SJesper Dangaard Brouer size_t i; 73011c7aec2SJesper Dangaard Brouer 73111c7aec2SJesper Dangaard Brouer flags &= gfp_allowed_mask; 732da844b78SAndrey Konovalov 733da844b78SAndrey Konovalov /* 7349ce67395SFeng Tang * For kmalloc object, the allocated memory size(object_size) is likely 7359ce67395SFeng Tang * larger than the requested size(orig_size). If redzone check is 7369ce67395SFeng Tang * enabled for the extra space, don't zero it, as it will be redzoned 7379ce67395SFeng Tang * soon. The redzone operation for this extra space could be seen as a 7389ce67395SFeng Tang * replacement of current poisoning under certain debug option, and 7399ce67395SFeng Tang * won't break other sanity checks. 7409ce67395SFeng Tang */ 7419ce67395SFeng Tang if (kmem_cache_debug_flags(s, SLAB_STORE_USER | SLAB_RED_ZONE) && 7429ce67395SFeng Tang (s->flags & SLAB_KMALLOC)) 7439ce67395SFeng Tang zero_size = orig_size; 7449ce67395SFeng Tang 7459ce67395SFeng Tang /* 746da844b78SAndrey Konovalov * As memory initialization might be integrated into KASAN, 747da844b78SAndrey Konovalov * kasan_slab_alloc and initialization memset must be 748da844b78SAndrey Konovalov * kept together to avoid discrepancies in behavior. 749da844b78SAndrey Konovalov * 750da844b78SAndrey Konovalov * As p[i] might get tagged, memset and kmemleak hook come after KASAN. 751da844b78SAndrey Konovalov */ 75211c7aec2SJesper Dangaard Brouer for (i = 0; i < size; i++) { 753da844b78SAndrey Konovalov p[i] = kasan_slab_alloc(s, p[i], flags, init); 754da844b78SAndrey Konovalov if (p[i] && init && !kasan_has_integrated_init()) 7559ce67395SFeng Tang memset(p[i], 0, zero_size); 75653128245SAndrey Konovalov kmemleak_alloc_recursive(p[i], s->object_size, 1, 75711c7aec2SJesper Dangaard Brouer s->flags, flags); 75868ef169aSAlexander Potapenko kmsan_slab_alloc(s, p[i], flags); 75911c7aec2SJesper Dangaard Brouer } 76045264778SVladimir Davydov 76110befea9SRoman Gushchin memcg_slab_post_alloc_hook(s, objcg, flags, size, p); 76211c7aec2SJesper Dangaard Brouer } 76311c7aec2SJesper Dangaard Brouer 76444c5356fSChristoph Lameter #ifndef CONFIG_SLOB 765ca34956bSChristoph Lameter /* 766ca34956bSChristoph Lameter * The slab lists for all objects. 767ca34956bSChristoph Lameter */ 768ca34956bSChristoph Lameter struct kmem_cache_node { 769ca34956bSChristoph Lameter spinlock_t list_lock; 770ca34956bSChristoph Lameter 771ca34956bSChristoph Lameter #ifdef CONFIG_SLAB 772ca34956bSChristoph Lameter struct list_head slabs_partial; /* partial list first, better asm code */ 773ca34956bSChristoph Lameter struct list_head slabs_full; 774ca34956bSChristoph Lameter struct list_head slabs_free; 775bf00bd34SDavid Rientjes unsigned long total_slabs; /* length of all slab lists */ 776bf00bd34SDavid Rientjes unsigned long free_slabs; /* length of free slab list only */ 777ca34956bSChristoph Lameter unsigned long free_objects; 778ca34956bSChristoph Lameter unsigned int free_limit; 779ca34956bSChristoph Lameter unsigned int colour_next; /* Per-node cache coloring */ 780ca34956bSChristoph Lameter struct array_cache *shared; /* shared per node */ 781c8522a3aSJoonsoo Kim struct alien_cache **alien; /* on other nodes */ 782ca34956bSChristoph Lameter unsigned long next_reap; /* updated without locking */ 783ca34956bSChristoph Lameter int free_touched; /* updated without locking */ 784ca34956bSChristoph Lameter #endif 785ca34956bSChristoph Lameter 786ca34956bSChristoph Lameter #ifdef CONFIG_SLUB 787ca34956bSChristoph Lameter unsigned long nr_partial; 788ca34956bSChristoph Lameter struct list_head partial; 789ca34956bSChristoph Lameter #ifdef CONFIG_SLUB_DEBUG 790ca34956bSChristoph Lameter atomic_long_t nr_slabs; 791ca34956bSChristoph Lameter atomic_long_t total_objects; 792ca34956bSChristoph Lameter struct list_head full; 793ca34956bSChristoph Lameter #endif 794ca34956bSChristoph Lameter #endif 795ca34956bSChristoph Lameter 796ca34956bSChristoph Lameter }; 797e25839f6SWanpeng Li 79844c5356fSChristoph Lameter static inline struct kmem_cache_node *get_node(struct kmem_cache *s, int node) 79944c5356fSChristoph Lameter { 80044c5356fSChristoph Lameter return s->node[node]; 80144c5356fSChristoph Lameter } 80244c5356fSChristoph Lameter 80344c5356fSChristoph Lameter /* 80444c5356fSChristoph Lameter * Iterator over all nodes. The body will be executed for each node that has 80544c5356fSChristoph Lameter * a kmem_cache_node structure allocated (which is true for all online nodes) 80644c5356fSChristoph Lameter */ 80744c5356fSChristoph Lameter #define for_each_kmem_cache_node(__s, __node, __n) \ 8089163582cSMikulas Patocka for (__node = 0; __node < nr_node_ids; __node++) \ 8099163582cSMikulas Patocka if ((__n = get_node(__s, __node))) 81044c5356fSChristoph Lameter 81144c5356fSChristoph Lameter #endif 81244c5356fSChristoph Lameter 813852d8be0SYang Shi #if defined(CONFIG_SLAB) || defined(CONFIG_SLUB_DEBUG) 814852d8be0SYang Shi void dump_unreclaimable_slab(void); 815852d8be0SYang Shi #else 816852d8be0SYang Shi static inline void dump_unreclaimable_slab(void) 817852d8be0SYang Shi { 818852d8be0SYang Shi } 819852d8be0SYang Shi #endif 820852d8be0SYang Shi 82155834c59SAlexander Potapenko void ___cache_free(struct kmem_cache *cache, void *x, unsigned long addr); 82255834c59SAlexander Potapenko 8237c00fce9SThomas Garnier #ifdef CONFIG_SLAB_FREELIST_RANDOM 8247c00fce9SThomas Garnier int cache_random_seq_create(struct kmem_cache *cachep, unsigned int count, 8257c00fce9SThomas Garnier gfp_t gfp); 8267c00fce9SThomas Garnier void cache_random_seq_destroy(struct kmem_cache *cachep); 8277c00fce9SThomas Garnier #else 8287c00fce9SThomas Garnier static inline int cache_random_seq_create(struct kmem_cache *cachep, 8297c00fce9SThomas Garnier unsigned int count, gfp_t gfp) 8307c00fce9SThomas Garnier { 8317c00fce9SThomas Garnier return 0; 8327c00fce9SThomas Garnier } 8337c00fce9SThomas Garnier static inline void cache_random_seq_destroy(struct kmem_cache *cachep) { } 8347c00fce9SThomas Garnier #endif /* CONFIG_SLAB_FREELIST_RANDOM */ 8357c00fce9SThomas Garnier 8366471384aSAlexander Potapenko static inline bool slab_want_init_on_alloc(gfp_t flags, struct kmem_cache *c) 8376471384aSAlexander Potapenko { 83851cba1ebSKees Cook if (static_branch_maybe(CONFIG_INIT_ON_ALLOC_DEFAULT_ON, 83951cba1ebSKees Cook &init_on_alloc)) { 8406471384aSAlexander Potapenko if (c->ctor) 8416471384aSAlexander Potapenko return false; 8426471384aSAlexander Potapenko if (c->flags & (SLAB_TYPESAFE_BY_RCU | SLAB_POISON)) 8436471384aSAlexander Potapenko return flags & __GFP_ZERO; 8446471384aSAlexander Potapenko return true; 8456471384aSAlexander Potapenko } 8466471384aSAlexander Potapenko return flags & __GFP_ZERO; 8476471384aSAlexander Potapenko } 8486471384aSAlexander Potapenko 8496471384aSAlexander Potapenko static inline bool slab_want_init_on_free(struct kmem_cache *c) 8506471384aSAlexander Potapenko { 85151cba1ebSKees Cook if (static_branch_maybe(CONFIG_INIT_ON_FREE_DEFAULT_ON, 85251cba1ebSKees Cook &init_on_free)) 8536471384aSAlexander Potapenko return !(c->ctor || 8546471384aSAlexander Potapenko (c->flags & (SLAB_TYPESAFE_BY_RCU | SLAB_POISON))); 8556471384aSAlexander Potapenko return false; 8566471384aSAlexander Potapenko } 8576471384aSAlexander Potapenko 85864dd6849SFaiyaz Mohammed #if defined(CONFIG_DEBUG_FS) && defined(CONFIG_SLUB_DEBUG) 85964dd6849SFaiyaz Mohammed void debugfs_slab_release(struct kmem_cache *); 86064dd6849SFaiyaz Mohammed #else 86164dd6849SFaiyaz Mohammed static inline void debugfs_slab_release(struct kmem_cache *s) { } 86264dd6849SFaiyaz Mohammed #endif 86364dd6849SFaiyaz Mohammed 8645bb1bb35SPaul E. McKenney #ifdef CONFIG_PRINTK 8658e7f37f2SPaul E. McKenney #define KS_ADDRS_COUNT 16 8668e7f37f2SPaul E. McKenney struct kmem_obj_info { 8678e7f37f2SPaul E. McKenney void *kp_ptr; 8687213230aSMatthew Wilcox (Oracle) struct slab *kp_slab; 8698e7f37f2SPaul E. McKenney void *kp_objp; 8708e7f37f2SPaul E. McKenney unsigned long kp_data_offset; 8718e7f37f2SPaul E. McKenney struct kmem_cache *kp_slab_cache; 8728e7f37f2SPaul E. McKenney void *kp_ret; 8738e7f37f2SPaul E. McKenney void *kp_stack[KS_ADDRS_COUNT]; 874e548eaa1SManinder Singh void *kp_free_stack[KS_ADDRS_COUNT]; 8758e7f37f2SPaul E. McKenney }; 8762dfe63e6SMarco Elver void __kmem_obj_info(struct kmem_obj_info *kpp, void *object, struct slab *slab); 8775bb1bb35SPaul E. McKenney #endif 8788e7f37f2SPaul E. McKenney 8790b3eb091SMatthew Wilcox (Oracle) #ifdef CONFIG_HAVE_HARDENED_USERCOPY_ALLOCATOR 8800b3eb091SMatthew Wilcox (Oracle) void __check_heap_object(const void *ptr, unsigned long n, 8810b3eb091SMatthew Wilcox (Oracle) const struct slab *slab, bool to_user); 8820b3eb091SMatthew Wilcox (Oracle) #else 8830b3eb091SMatthew Wilcox (Oracle) static inline 8840b3eb091SMatthew Wilcox (Oracle) void __check_heap_object(const void *ptr, unsigned long n, 8850b3eb091SMatthew Wilcox (Oracle) const struct slab *slab, bool to_user) 8860b3eb091SMatthew Wilcox (Oracle) { 8870b3eb091SMatthew Wilcox (Oracle) } 8880b3eb091SMatthew Wilcox (Oracle) #endif 8890b3eb091SMatthew Wilcox (Oracle) 890946fa0dbSFeng Tang #ifdef CONFIG_SLUB_DEBUG 891946fa0dbSFeng Tang void skip_orig_size_check(struct kmem_cache *s, const void *object); 892946fa0dbSFeng Tang #endif 893946fa0dbSFeng Tang 8945240ab40SAndrey Ryabinin #endif /* MM_SLAB_H */ 895