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Greg Kroah-Hartmanb2441312017-11-01 15:07:57 +01001/* SPDX-License-Identifier: GPL-2.0 */
Christoph Lameter97d06602012-07-06 15:25:11 -05002#ifndef MM_SLAB_H
3#define MM_SLAB_H
4/*
5 * Internal slab definitions
6 */
7
Joonsoo Kim07f361b2014-10-09 15:26:00 -07008#ifdef CONFIG_SLOB
9/*
10 * Common fields provided in kmem_cache by all slab allocators
11 * This struct is either used directly by the allocator (SLOB)
12 * or the allocator must include definitions for all fields
13 * provided in kmem_cache_common in their definition of kmem_cache.
14 *
15 * Once we can do anonymous structs (C11 standard) we could put a
16 * anonymous struct definition in these allocators so that the
17 * separate allocations in the kmem_cache structure of SLAB and
18 * SLUB is no longer needed.
19 */
20struct kmem_cache {
21 unsigned int object_size;/* The original size of the object */
22 unsigned int size; /* The aligned/padded/added on size */
23 unsigned int align; /* Alignment as calculated */
Alexey Dobriyand50112e2017-11-15 17:32:18 -080024 slab_flags_t flags; /* Active flags on the slab */
Alexey Dobriyan7bbdb812018-04-05 16:21:31 -070025 unsigned int useroffset;/* Usercopy region offset */
26 unsigned int usersize; /* Usercopy region size */
Joonsoo Kim07f361b2014-10-09 15:26:00 -070027 const char *name; /* Slab name for sysfs */
28 int refcount; /* Use counter */
29 void (*ctor)(void *); /* Called on object slot creation */
30 struct list_head list; /* List of all slab caches on the system */
31};
32
33#endif /* CONFIG_SLOB */
34
35#ifdef CONFIG_SLAB
36#include <linux/slab_def.h>
37#endif
38
39#ifdef CONFIG_SLUB
40#include <linux/slub_def.h>
41#endif
42
43#include <linux/memcontrol.h>
Jesper Dangaard Brouer11c7aec2016-03-15 14:53:35 -070044#include <linux/fault-inject.h>
Jesper Dangaard Brouer11c7aec2016-03-15 14:53:35 -070045#include <linux/kasan.h>
46#include <linux/kmemleak.h>
Thomas Garnier7c00fce2016-07-26 15:21:56 -070047#include <linux/random.h>
Peter Zijlstrad92a8cf2017-03-03 10:13:38 +010048#include <linux/sched/mm.h>
Joonsoo Kim07f361b2014-10-09 15:26:00 -070049
Christoph Lameter97d06602012-07-06 15:25:11 -050050/*
51 * State of the slab allocator.
52 *
53 * This is used to describe the states of the allocator during bootup.
54 * Allocators use this to gradually bootstrap themselves. Most allocators
55 * have the problem that the structures used for managing slab caches are
56 * allocated from slab caches themselves.
57 */
58enum slab_state {
59 DOWN, /* No slab functionality yet */
60 PARTIAL, /* SLUB: kmem_cache_node available */
Christoph Lameterce8eb6c2013-01-10 19:14:19 +000061 PARTIAL_NODE, /* SLAB: kmalloc size for node struct available */
Christoph Lameter97d06602012-07-06 15:25:11 -050062 UP, /* Slab caches usable but not all extras yet */
63 FULL /* Everything is working */
64};
65
66extern enum slab_state slab_state;
67
Christoph Lameter18004c52012-07-06 15:25:12 -050068/* The slab cache mutex protects the management structures during changes */
69extern struct mutex slab_mutex;
Christoph Lameter9b030cb2012-09-05 00:20:33 +000070
71/* The list of all slab caches on the system */
Christoph Lameter18004c52012-07-06 15:25:12 -050072extern struct list_head slab_caches;
73
Christoph Lameter9b030cb2012-09-05 00:20:33 +000074/* The slab cache that manages slab cache information */
75extern struct kmem_cache *kmem_cache;
76
Vlastimil Babkaaf3b5f82017-02-22 15:41:05 -080077/* A table of kmalloc cache names and sizes */
78extern const struct kmalloc_info_struct {
79 const char *name;
Alexey Dobriyan55de8b92018-04-05 16:20:29 -070080 unsigned int size;
Vlastimil Babkaaf3b5f82017-02-22 15:41:05 -080081} kmalloc_info[];
82
Christoph Lameterf97d5f62013-01-10 19:12:17 +000083#ifndef CONFIG_SLOB
84/* Kmalloc array related functions */
Daniel Sanders34cc6992015-06-24 16:55:57 -070085void setup_kmalloc_cache_index_table(void);
Alexey Dobriyand50112e2017-11-15 17:32:18 -080086void create_kmalloc_caches(slab_flags_t);
Christoph Lameter2c59dd62013-01-10 19:14:19 +000087
88/* Find the kmalloc slab corresponding for a certain size */
89struct kmem_cache *kmalloc_slab(size_t, gfp_t);
Christoph Lameterf97d5f62013-01-10 19:12:17 +000090#endif
91
92
Christoph Lameter9b030cb2012-09-05 00:20:33 +000093/* Functions provided by the slab allocators */
Alexey Dobriyand50112e2017-11-15 17:32:18 -080094int __kmem_cache_create(struct kmem_cache *, slab_flags_t flags);
Christoph Lameter97d06602012-07-06 15:25:11 -050095
Alexey Dobriyan55de8b92018-04-05 16:20:29 -070096struct kmem_cache *create_kmalloc_cache(const char *name, unsigned int size,
97 slab_flags_t flags, unsigned int useroffset,
98 unsigned int usersize);
Christoph Lameter45530c42012-11-28 16:23:07 +000099extern void create_boot_cache(struct kmem_cache *, const char *name,
Alexey Dobriyan361d5752018-04-05 16:20:33 -0700100 unsigned int size, slab_flags_t flags,
101 unsigned int useroffset, unsigned int usersize);
Christoph Lameter45530c42012-11-28 16:23:07 +0000102
Joonsoo Kim423c9292014-10-09 15:26:22 -0700103int slab_unmergeable(struct kmem_cache *s);
Alexey Dobriyanf4957d52018-04-05 16:20:37 -0700104struct kmem_cache *find_mergeable(unsigned size, unsigned align,
Alexey Dobriyand50112e2017-11-15 17:32:18 -0800105 slab_flags_t flags, const char *name, void (*ctor)(void *));
Joonsoo Kim12220de2014-10-09 15:26:24 -0700106#ifndef CONFIG_SLOB
Glauber Costa2633d7a2012-12-18 14:22:34 -0800107struct kmem_cache *
Alexey Dobriyanf4957d52018-04-05 16:20:37 -0700108__kmem_cache_alias(const char *name, unsigned int size, unsigned int align,
Alexey Dobriyand50112e2017-11-15 17:32:18 -0800109 slab_flags_t flags, void (*ctor)(void *));
Joonsoo Kim423c9292014-10-09 15:26:22 -0700110
Alexey Dobriyan0293d1f2018-04-05 16:21:24 -0700111slab_flags_t kmem_cache_flags(unsigned int object_size,
Alexey Dobriyand50112e2017-11-15 17:32:18 -0800112 slab_flags_t flags, const char *name,
Joonsoo Kim423c9292014-10-09 15:26:22 -0700113 void (*ctor)(void *));
Christoph Lametercbb79692012-09-05 00:18:32 +0000114#else
Glauber Costa2633d7a2012-12-18 14:22:34 -0800115static inline struct kmem_cache *
Alexey Dobriyanf4957d52018-04-05 16:20:37 -0700116__kmem_cache_alias(const char *name, unsigned int size, unsigned int align,
Alexey Dobriyand50112e2017-11-15 17:32:18 -0800117 slab_flags_t flags, void (*ctor)(void *))
Christoph Lametercbb79692012-09-05 00:18:32 +0000118{ return NULL; }
Joonsoo Kim423c9292014-10-09 15:26:22 -0700119
Alexey Dobriyan0293d1f2018-04-05 16:21:24 -0700120static inline slab_flags_t kmem_cache_flags(unsigned int object_size,
Alexey Dobriyand50112e2017-11-15 17:32:18 -0800121 slab_flags_t flags, const char *name,
Joonsoo Kim423c9292014-10-09 15:26:22 -0700122 void (*ctor)(void *))
123{
124 return flags;
125}
Christoph Lametercbb79692012-09-05 00:18:32 +0000126#endif
127
128
Glauber Costad8843922012-10-17 15:36:51 +0400129/* Legal flag mask for kmem_cache_create(), for various configurations */
Nicolas Boichat6d6ea1e2019-03-28 20:43:42 -0700130#define SLAB_CORE_FLAGS (SLAB_HWCACHE_ALIGN | SLAB_CACHE_DMA | \
131 SLAB_CACHE_DMA32 | SLAB_PANIC | \
Paul E. McKenney5f0d5a32017-01-18 02:53:44 -0800132 SLAB_TYPESAFE_BY_RCU | SLAB_DEBUG_OBJECTS )
Glauber Costad8843922012-10-17 15:36:51 +0400133
134#if defined(CONFIG_DEBUG_SLAB)
135#define SLAB_DEBUG_FLAGS (SLAB_RED_ZONE | SLAB_POISON | SLAB_STORE_USER)
136#elif defined(CONFIG_SLUB_DEBUG)
137#define SLAB_DEBUG_FLAGS (SLAB_RED_ZONE | SLAB_POISON | SLAB_STORE_USER | \
Laura Abbottbecfda62016-03-15 14:55:06 -0700138 SLAB_TRACE | SLAB_CONSISTENCY_CHECKS)
Glauber Costad8843922012-10-17 15:36:51 +0400139#else
140#define SLAB_DEBUG_FLAGS (0)
141#endif
142
143#if defined(CONFIG_SLAB)
144#define SLAB_CACHE_FLAGS (SLAB_MEM_SPREAD | SLAB_NOLEAKTRACE | \
Vladimir Davydov230e9fc2016-01-14 15:18:15 -0800145 SLAB_RECLAIM_ACCOUNT | SLAB_TEMPORARY | \
Levin, Alexander (Sasha Levin)75f296d2017-11-15 17:35:54 -0800146 SLAB_ACCOUNT)
Glauber Costad8843922012-10-17 15:36:51 +0400147#elif defined(CONFIG_SLUB)
148#define SLAB_CACHE_FLAGS (SLAB_NOLEAKTRACE | SLAB_RECLAIM_ACCOUNT | \
Levin, Alexander (Sasha Levin)75f296d2017-11-15 17:35:54 -0800149 SLAB_TEMPORARY | SLAB_ACCOUNT)
Glauber Costad8843922012-10-17 15:36:51 +0400150#else
151#define SLAB_CACHE_FLAGS (0)
152#endif
153
Thomas Garniere70954f2016-12-12 16:41:38 -0800154/* Common flags available with current configuration */
Glauber Costad8843922012-10-17 15:36:51 +0400155#define CACHE_CREATE_MASK (SLAB_CORE_FLAGS | SLAB_DEBUG_FLAGS | SLAB_CACHE_FLAGS)
156
Thomas Garniere70954f2016-12-12 16:41:38 -0800157/* Common flags permitted for kmem_cache_create */
158#define SLAB_FLAGS_PERMITTED (SLAB_CORE_FLAGS | \
159 SLAB_RED_ZONE | \
160 SLAB_POISON | \
161 SLAB_STORE_USER | \
162 SLAB_TRACE | \
163 SLAB_CONSISTENCY_CHECKS | \
164 SLAB_MEM_SPREAD | \
165 SLAB_NOLEAKTRACE | \
166 SLAB_RECLAIM_ACCOUNT | \
167 SLAB_TEMPORARY | \
Thomas Garniere70954f2016-12-12 16:41:38 -0800168 SLAB_ACCOUNT)
169
Shakeel Buttf9e13c02018-04-05 16:21:57 -0700170bool __kmem_cache_empty(struct kmem_cache *);
Christoph Lameter945cf2b2012-09-04 23:18:33 +0000171int __kmem_cache_shutdown(struct kmem_cache *);
Dmitry Safonov52b4b952016-02-17 13:11:37 -0800172void __kmem_cache_release(struct kmem_cache *);
Tejun Heoc9fc5862017-02-22 15:41:27 -0800173int __kmem_cache_shrink(struct kmem_cache *);
174void __kmemcg_cache_deactivate(struct kmem_cache *s);
Roman Gushchin43486692019-07-11 20:56:09 -0700175void __kmemcg_cache_deactivate_after_rcu(struct kmem_cache *s);
Christoph Lameter41a21282014-05-06 12:50:08 -0700176void slab_kmem_cache_release(struct kmem_cache *);
Christoph Lameter945cf2b2012-09-04 23:18:33 +0000177
Glauber Costab7454ad2012-10-19 18:20:25 +0400178struct seq_file;
179struct file;
Glauber Costab7454ad2012-10-19 18:20:25 +0400180
Glauber Costa0d7561c2012-10-19 18:20:27 +0400181struct slabinfo {
182 unsigned long active_objs;
183 unsigned long num_objs;
184 unsigned long active_slabs;
185 unsigned long num_slabs;
186 unsigned long shared_avail;
187 unsigned int limit;
188 unsigned int batchcount;
189 unsigned int shared;
190 unsigned int objects_per_slab;
191 unsigned int cache_order;
192};
193
194void get_slabinfo(struct kmem_cache *s, struct slabinfo *sinfo);
195void slabinfo_show_stats(struct seq_file *m, struct kmem_cache *s);
Glauber Costab7454ad2012-10-19 18:20:25 +0400196ssize_t slabinfo_write(struct file *file, const char __user *buffer,
197 size_t count, loff_t *ppos);
Glauber Costaba6c4962012-12-18 14:22:27 -0800198
Christoph Lameter484748f2015-09-04 15:45:34 -0700199/*
200 * Generic implementation of bulk operations
201 * These are useful for situations in which the allocator cannot
Jesper Dangaard Brouer9f706d62016-03-15 14:54:03 -0700202 * perform optimizations. In that case segments of the object listed
Christoph Lameter484748f2015-09-04 15:45:34 -0700203 * may be allocated or freed using these operations.
204 */
205void __kmem_cache_free_bulk(struct kmem_cache *, size_t, void **);
Jesper Dangaard Brouer865762a2015-11-20 15:57:58 -0800206int __kmem_cache_alloc_bulk(struct kmem_cache *, gfp_t, size_t, void **);
Christoph Lameter484748f2015-09-04 15:45:34 -0700207
Roman Gushchin6cea1d52019-07-11 20:56:16 -0700208static inline int cache_vmstat_idx(struct kmem_cache *s)
209{
210 return (s->flags & SLAB_RECLAIM_ACCOUNT) ?
211 NR_SLAB_RECLAIMABLE : NR_SLAB_UNRECLAIMABLE;
212}
213
Kirill Tkhai84c07d12018-08-17 15:47:25 -0700214#ifdef CONFIG_MEMCG_KMEM
Tejun Heo510ded32017-02-22 15:41:24 -0800215
216/* List of all root caches. */
217extern struct list_head slab_root_caches;
218#define root_caches_node memcg_params.__root_caches_node
219
Vladimir Davydov426589f2015-02-12 14:59:23 -0800220/*
221 * Iterate over all memcg caches of the given root cache. The caller must hold
222 * slab_mutex.
223 */
224#define for_each_memcg_cache(iter, root) \
Tejun Heo9eeadc82017-02-22 15:41:17 -0800225 list_for_each_entry(iter, &(root)->memcg_params.children, \
226 memcg_params.children_node)
Vladimir Davydov426589f2015-02-12 14:59:23 -0800227
Glauber Costaba6c4962012-12-18 14:22:27 -0800228static inline bool is_root_cache(struct kmem_cache *s)
229{
Tejun Heo9eeadc82017-02-22 15:41:17 -0800230 return !s->memcg_params.root_cache;
Glauber Costaba6c4962012-12-18 14:22:27 -0800231}
Glauber Costa2633d7a2012-12-18 14:22:34 -0800232
Glauber Costab9ce5ef2012-12-18 14:22:46 -0800233static inline bool slab_equal_or_root(struct kmem_cache *s,
Vladimir Davydovf7ce3192015-02-12 14:59:20 -0800234 struct kmem_cache *p)
Glauber Costab9ce5ef2012-12-18 14:22:46 -0800235{
Vladimir Davydovf7ce3192015-02-12 14:59:20 -0800236 return p == s || p == s->memcg_params.root_cache;
Glauber Costab9ce5ef2012-12-18 14:22:46 -0800237}
Glauber Costa749c5412012-12-18 14:23:01 -0800238
239/*
240 * We use suffixes to the name in memcg because we can't have caches
241 * created in the system with the same name. But when we print them
242 * locally, better refer to them with the base name
243 */
244static inline const char *cache_name(struct kmem_cache *s)
245{
246 if (!is_root_cache(s))
Vladimir Davydovf7ce3192015-02-12 14:59:20 -0800247 s = s->memcg_params.root_cache;
Glauber Costa749c5412012-12-18 14:23:01 -0800248 return s->name;
249}
250
Vladimir Davydovf8570262014-01-23 15:53:06 -0800251/*
252 * Note, we protect with RCU only the memcg_caches array, not per-memcg caches.
Vladimir Davydovf7ce3192015-02-12 14:59:20 -0800253 * That said the caller must assure the memcg's cache won't go away by either
254 * taking a css reference to the owner cgroup, or holding the slab_mutex.
Vladimir Davydovf8570262014-01-23 15:53:06 -0800255 */
Qiang Huang2ade4de2013-11-12 15:08:23 -0800256static inline struct kmem_cache *
257cache_from_memcg_idx(struct kmem_cache *s, int idx)
Glauber Costa749c5412012-12-18 14:23:01 -0800258{
Vladimir Davydov959c8962014-01-23 15:52:59 -0800259 struct kmem_cache *cachep;
Vladimir Davydovf7ce3192015-02-12 14:59:20 -0800260 struct memcg_cache_array *arr;
Vladimir Davydovf8570262014-01-23 15:53:06 -0800261
262 rcu_read_lock();
Vladimir Davydovf7ce3192015-02-12 14:59:20 -0800263 arr = rcu_dereference(s->memcg_params.memcg_caches);
Vladimir Davydov959c8962014-01-23 15:52:59 -0800264
265 /*
266 * Make sure we will access the up-to-date value. The code updating
267 * memcg_caches issues a write barrier to match this (see
Vladimir Davydovf7ce3192015-02-12 14:59:20 -0800268 * memcg_create_kmem_cache()).
Vladimir Davydov959c8962014-01-23 15:52:59 -0800269 */
Will Deacon506458e2017-10-24 11:22:48 +0100270 cachep = READ_ONCE(arr->entries[idx]);
Pranith Kumar8df0c2d2014-12-10 15:42:28 -0800271 rcu_read_unlock();
272
Vladimir Davydov959c8962014-01-23 15:52:59 -0800273 return cachep;
Glauber Costa749c5412012-12-18 14:23:01 -0800274}
Glauber Costa943a4512012-12-18 14:23:03 -0800275
276static inline struct kmem_cache *memcg_root_cache(struct kmem_cache *s)
277{
278 if (is_root_cache(s))
279 return s;
Vladimir Davydovf7ce3192015-02-12 14:59:20 -0800280 return s->memcg_params.root_cache;
Glauber Costa943a4512012-12-18 14:23:03 -0800281}
Vladimir Davydov5dfb4172014-06-04 16:06:38 -0700282
Vladimir Davydovf3ccb2c42015-11-05 18:49:01 -0800283static __always_inline int memcg_charge_slab(struct page *page,
284 gfp_t gfp, int order,
285 struct kmem_cache *s)
Vladimir Davydov5dfb4172014-06-04 16:06:38 -0700286{
Vladimir Davydov5dfb4172014-06-04 16:06:38 -0700287 if (is_root_cache(s))
288 return 0;
Johannes Weiner7779f212017-07-06 15:40:55 -0700289 return memcg_kmem_charge_memcg(page, gfp, order, s->memcg_params.memcg);
Vladimir Davydov27ee57c2016-03-17 14:17:35 -0700290}
291
292static __always_inline void memcg_uncharge_slab(struct page *page, int order,
293 struct kmem_cache *s)
294{
Vladimir Davydov27ee57c2016-03-17 14:17:35 -0700295 memcg_kmem_uncharge(page, order);
Vladimir Davydov5dfb4172014-06-04 16:06:38 -0700296}
Vladimir Davydovf7ce3192015-02-12 14:59:20 -0800297
298extern void slab_init_memcg_params(struct kmem_cache *);
Roman Gushchinc03914b2019-07-11 20:56:02 -0700299extern void memcg_link_cache(struct kmem_cache *s, struct mem_cgroup *memcg);
Vladimir Davydovf7ce3192015-02-12 14:59:20 -0800300
Kirill Tkhai84c07d12018-08-17 15:47:25 -0700301#else /* CONFIG_MEMCG_KMEM */
Vladimir Davydovf7ce3192015-02-12 14:59:20 -0800302
Tejun Heo510ded32017-02-22 15:41:24 -0800303/* If !memcg, all caches are root. */
304#define slab_root_caches slab_caches
305#define root_caches_node list
306
Vladimir Davydov426589f2015-02-12 14:59:23 -0800307#define for_each_memcg_cache(iter, root) \
308 for ((void)(iter), (void)(root); 0; )
Vladimir Davydov426589f2015-02-12 14:59:23 -0800309
Glauber Costaba6c4962012-12-18 14:22:27 -0800310static inline bool is_root_cache(struct kmem_cache *s)
311{
312 return true;
313}
314
Glauber Costab9ce5ef2012-12-18 14:22:46 -0800315static inline bool slab_equal_or_root(struct kmem_cache *s,
316 struct kmem_cache *p)
317{
Kees Cook598a0712019-07-11 20:53:23 -0700318 return s == p;
Glauber Costab9ce5ef2012-12-18 14:22:46 -0800319}
Glauber Costa749c5412012-12-18 14:23:01 -0800320
321static inline const char *cache_name(struct kmem_cache *s)
322{
323 return s->name;
324}
325
Qiang Huang2ade4de2013-11-12 15:08:23 -0800326static inline struct kmem_cache *
327cache_from_memcg_idx(struct kmem_cache *s, int idx)
Glauber Costa749c5412012-12-18 14:23:01 -0800328{
329 return NULL;
330}
Glauber Costa943a4512012-12-18 14:23:03 -0800331
332static inline struct kmem_cache *memcg_root_cache(struct kmem_cache *s)
333{
334 return s;
335}
Vladimir Davydov5dfb4172014-06-04 16:06:38 -0700336
Vladimir Davydovf3ccb2c42015-11-05 18:49:01 -0800337static inline int memcg_charge_slab(struct page *page, gfp_t gfp, int order,
338 struct kmem_cache *s)
Vladimir Davydov5dfb4172014-06-04 16:06:38 -0700339{
340 return 0;
341}
342
Vladimir Davydov27ee57c2016-03-17 14:17:35 -0700343static inline void memcg_uncharge_slab(struct page *page, int order,
344 struct kmem_cache *s)
345{
346}
347
Vladimir Davydovf7ce3192015-02-12 14:59:20 -0800348static inline void slab_init_memcg_params(struct kmem_cache *s)
349{
350}
Tejun Heo510ded32017-02-22 15:41:24 -0800351
Roman Gushchinc03914b2019-07-11 20:56:02 -0700352static inline void memcg_link_cache(struct kmem_cache *s,
353 struct mem_cgroup *memcg)
Tejun Heo510ded32017-02-22 15:41:24 -0800354{
355}
356
Kirill Tkhai84c07d12018-08-17 15:47:25 -0700357#endif /* CONFIG_MEMCG_KMEM */
Glauber Costab9ce5ef2012-12-18 14:22:46 -0800358
Kees Cooka64b5372019-07-11 20:53:26 -0700359static inline struct kmem_cache *virt_to_cache(const void *obj)
360{
361 struct page *page;
362
363 page = virt_to_head_page(obj);
364 if (WARN_ONCE(!PageSlab(page), "%s: Object is not a Slab page!\n",
365 __func__))
366 return NULL;
367 return page->slab_cache;
368}
369
Roman Gushchin6cea1d52019-07-11 20:56:16 -0700370static __always_inline int charge_slab_page(struct page *page,
371 gfp_t gfp, int order,
372 struct kmem_cache *s)
373{
374 int ret = memcg_charge_slab(page, gfp, order, s);
375
376 if (!ret)
377 mod_lruvec_page_state(page, cache_vmstat_idx(s), 1 << order);
378
379 return ret;
380}
381
382static __always_inline void uncharge_slab_page(struct page *page, int order,
383 struct kmem_cache *s)
384{
385 mod_lruvec_page_state(page, cache_vmstat_idx(s), -(1 << order));
386 memcg_uncharge_slab(page, order, s);
387}
388
Glauber Costab9ce5ef2012-12-18 14:22:46 -0800389static inline struct kmem_cache *cache_from_obj(struct kmem_cache *s, void *x)
390{
391 struct kmem_cache *cachep;
Glauber Costab9ce5ef2012-12-18 14:22:46 -0800392
393 /*
394 * When kmemcg is not being used, both assignments should return the
395 * same value. but we don't want to pay the assignment price in that
396 * case. If it is not compiled in, the compiler should be smart enough
397 * to not do even the assignment. In that case, slab_equal_or_root
398 * will also be a constant.
399 */
Laura Abbottbecfda62016-03-15 14:55:06 -0700400 if (!memcg_kmem_enabled() &&
Kees Cook598a0712019-07-11 20:53:23 -0700401 !IS_ENABLED(CONFIG_SLAB_FREELIST_HARDENED) &&
Laura Abbottbecfda62016-03-15 14:55:06 -0700402 !unlikely(s->flags & SLAB_CONSISTENCY_CHECKS))
Glauber Costab9ce5ef2012-12-18 14:22:46 -0800403 return s;
404
Kees Cooka64b5372019-07-11 20:53:26 -0700405 cachep = virt_to_cache(x);
406 WARN_ONCE(cachep && !slab_equal_or_root(cachep, s),
Kees Cook598a0712019-07-11 20:53:23 -0700407 "%s: Wrong slab cache. %s but object is from %s\n",
408 __func__, s->name, cachep->name);
409 return cachep;
Glauber Costab9ce5ef2012-12-18 14:22:46 -0800410}
Christoph Lameterca349562013-01-10 19:14:19 +0000411
Jesper Dangaard Brouer11c7aec2016-03-15 14:53:35 -0700412static inline size_t slab_ksize(const struct kmem_cache *s)
413{
414#ifndef CONFIG_SLUB
415 return s->object_size;
416
417#else /* CONFIG_SLUB */
418# ifdef CONFIG_SLUB_DEBUG
419 /*
420 * Debugging requires use of the padding between object
421 * and whatever may come after it.
422 */
423 if (s->flags & (SLAB_RED_ZONE | SLAB_POISON))
424 return s->object_size;
425# endif
Alexander Potapenko80a92012016-07-28 15:49:07 -0700426 if (s->flags & SLAB_KASAN)
427 return s->object_size;
Jesper Dangaard Brouer11c7aec2016-03-15 14:53:35 -0700428 /*
429 * If we have the need to store the freelist pointer
430 * back there or track user information then we can
431 * only use the space before that information.
432 */
Paul E. McKenney5f0d5a32017-01-18 02:53:44 -0800433 if (s->flags & (SLAB_TYPESAFE_BY_RCU | SLAB_STORE_USER))
Jesper Dangaard Brouer11c7aec2016-03-15 14:53:35 -0700434 return s->inuse;
435 /*
436 * Else we can use all the padding etc for the allocation
437 */
438 return s->size;
439#endif
440}
441
442static inline struct kmem_cache *slab_pre_alloc_hook(struct kmem_cache *s,
443 gfp_t flags)
444{
445 flags &= gfp_allowed_mask;
Peter Zijlstrad92a8cf2017-03-03 10:13:38 +0100446
447 fs_reclaim_acquire(flags);
448 fs_reclaim_release(flags);
449
Jesper Dangaard Brouer11c7aec2016-03-15 14:53:35 -0700450 might_sleep_if(gfpflags_allow_blocking(flags));
451
Jesper Dangaard Brouerfab99632016-03-15 14:53:38 -0700452 if (should_failslab(s, flags))
Jesper Dangaard Brouer11c7aec2016-03-15 14:53:35 -0700453 return NULL;
454
Vladimir Davydov45264772016-07-26 15:24:21 -0700455 if (memcg_kmem_enabled() &&
456 ((flags & __GFP_ACCOUNT) || (s->flags & SLAB_ACCOUNT)))
457 return memcg_kmem_get_cache(s);
458
459 return s;
Jesper Dangaard Brouer11c7aec2016-03-15 14:53:35 -0700460}
461
462static inline void slab_post_alloc_hook(struct kmem_cache *s, gfp_t flags,
463 size_t size, void **p)
464{
465 size_t i;
466
467 flags &= gfp_allowed_mask;
468 for (i = 0; i < size; i++) {
Andrey Konovalov53128242019-02-20 22:19:11 -0800469 p[i] = kasan_slab_alloc(s, p[i], flags);
Andrey Konovalova2f77572019-02-20 22:19:16 -0800470 /* As p[i] might get tagged, call kmemleak hook after KASAN. */
Andrey Konovalov53128242019-02-20 22:19:11 -0800471 kmemleak_alloc_recursive(p[i], s->object_size, 1,
Jesper Dangaard Brouer11c7aec2016-03-15 14:53:35 -0700472 s->flags, flags);
Jesper Dangaard Brouer11c7aec2016-03-15 14:53:35 -0700473 }
Vladimir Davydov45264772016-07-26 15:24:21 -0700474
475 if (memcg_kmem_enabled())
476 memcg_kmem_put_cache(s);
Jesper Dangaard Brouer11c7aec2016-03-15 14:53:35 -0700477}
478
Christoph Lameter44c53562014-08-06 16:04:07 -0700479#ifndef CONFIG_SLOB
Christoph Lameterca349562013-01-10 19:14:19 +0000480/*
481 * The slab lists for all objects.
482 */
483struct kmem_cache_node {
484 spinlock_t list_lock;
485
486#ifdef CONFIG_SLAB
487 struct list_head slabs_partial; /* partial list first, better asm code */
488 struct list_head slabs_full;
489 struct list_head slabs_free;
David Rientjesbf00bd32016-12-12 16:41:44 -0800490 unsigned long total_slabs; /* length of all slab lists */
491 unsigned long free_slabs; /* length of free slab list only */
Christoph Lameterca349562013-01-10 19:14:19 +0000492 unsigned long free_objects;
493 unsigned int free_limit;
494 unsigned int colour_next; /* Per-node cache coloring */
495 struct array_cache *shared; /* shared per node */
Joonsoo Kimc8522a32014-08-06 16:04:29 -0700496 struct alien_cache **alien; /* on other nodes */
Christoph Lameterca349562013-01-10 19:14:19 +0000497 unsigned long next_reap; /* updated without locking */
498 int free_touched; /* updated without locking */
499#endif
500
501#ifdef CONFIG_SLUB
502 unsigned long nr_partial;
503 struct list_head partial;
504#ifdef CONFIG_SLUB_DEBUG
505 atomic_long_t nr_slabs;
506 atomic_long_t total_objects;
507 struct list_head full;
508#endif
509#endif
510
511};
Wanpeng Lie25839f2013-07-04 08:33:23 +0800512
Christoph Lameter44c53562014-08-06 16:04:07 -0700513static inline struct kmem_cache_node *get_node(struct kmem_cache *s, int node)
514{
515 return s->node[node];
516}
517
518/*
519 * Iterator over all nodes. The body will be executed for each node that has
520 * a kmem_cache_node structure allocated (which is true for all online nodes)
521 */
522#define for_each_kmem_cache_node(__s, __node, __n) \
Mikulas Patocka91635822014-10-09 15:26:20 -0700523 for (__node = 0; __node < nr_node_ids; __node++) \
524 if ((__n = get_node(__s, __node)))
Christoph Lameter44c53562014-08-06 16:04:07 -0700525
526#endif
527
Vladimir Davydov1df3b262014-12-10 15:42:16 -0800528void *slab_start(struct seq_file *m, loff_t *pos);
Wanpeng Li276a2432013-07-08 08:08:28 +0800529void *slab_next(struct seq_file *m, void *p, loff_t *pos);
530void slab_stop(struct seq_file *m, void *p);
Tejun Heobc2791f2017-02-22 15:41:21 -0800531void *memcg_slab_start(struct seq_file *m, loff_t *pos);
532void *memcg_slab_next(struct seq_file *m, void *p, loff_t *pos);
533void memcg_slab_stop(struct seq_file *m, void *p);
Vladimir Davydovb0475012014-12-10 15:44:19 -0800534int memcg_slab_show(struct seq_file *m, void *p);
Andrey Ryabinin5240ab42014-08-06 16:04:14 -0700535
Yang Shi852d8be2017-11-15 17:32:07 -0800536#if defined(CONFIG_SLAB) || defined(CONFIG_SLUB_DEBUG)
537void dump_unreclaimable_slab(void);
538#else
539static inline void dump_unreclaimable_slab(void)
540{
541}
542#endif
543
Alexander Potapenko55834c52016-05-20 16:59:11 -0700544void ___cache_free(struct kmem_cache *cache, void *x, unsigned long addr);
545
Thomas Garnier7c00fce2016-07-26 15:21:56 -0700546#ifdef CONFIG_SLAB_FREELIST_RANDOM
547int cache_random_seq_create(struct kmem_cache *cachep, unsigned int count,
548 gfp_t gfp);
549void cache_random_seq_destroy(struct kmem_cache *cachep);
550#else
551static inline int cache_random_seq_create(struct kmem_cache *cachep,
552 unsigned int count, gfp_t gfp)
553{
554 return 0;
555}
556static inline void cache_random_seq_destroy(struct kmem_cache *cachep) { }
557#endif /* CONFIG_SLAB_FREELIST_RANDOM */
558
Andrey Ryabinin5240ab42014-08-06 16:04:14 -0700559#endif /* MM_SLAB_H */