677 lines
18 KiB
C
677 lines
18 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef MM_SLAB_H
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#define MM_SLAB_H
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#include <linux/reciprocal_div.h>
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#include <linux/list_lru.h>
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#include <linux/local_lock.h>
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#include <linux/random.h>
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#include <linux/kobject.h>
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#include <linux/sched/mm.h>
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#include <linux/memcontrol.h>
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#include <linux/kfence.h>
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#include <linux/kasan.h>
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/*
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* Internal slab definitions
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*/
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#ifdef CONFIG_64BIT
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# ifdef system_has_cmpxchg128
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# define system_has_freelist_aba() system_has_cmpxchg128()
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# define try_cmpxchg_freelist try_cmpxchg128
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# endif
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#define this_cpu_try_cmpxchg_freelist this_cpu_try_cmpxchg128
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typedef u128 freelist_full_t;
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#else /* CONFIG_64BIT */
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# ifdef system_has_cmpxchg64
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# define system_has_freelist_aba() system_has_cmpxchg64()
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# define try_cmpxchg_freelist try_cmpxchg64
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# endif
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#define this_cpu_try_cmpxchg_freelist this_cpu_try_cmpxchg64
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typedef u64 freelist_full_t;
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#endif /* CONFIG_64BIT */
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#if defined(system_has_freelist_aba) && !defined(CONFIG_HAVE_ALIGNED_STRUCT_PAGE)
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#undef system_has_freelist_aba
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#endif
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/*
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* Freelist pointer and counter to cmpxchg together, avoids the typical ABA
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* problems with cmpxchg of just a pointer.
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*/
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typedef union {
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struct {
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void *freelist;
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unsigned long counter;
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};
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freelist_full_t full;
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} freelist_aba_t;
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/* Reuses the bits in struct page */
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struct slab {
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unsigned long __page_flags;
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struct kmem_cache *slab_cache;
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union {
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struct {
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union {
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struct list_head slab_list;
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#ifdef CONFIG_SLUB_CPU_PARTIAL
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struct {
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struct slab *next;
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int slabs; /* Nr of slabs left */
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};
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#endif
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};
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/* Double-word boundary */
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union {
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struct {
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void *freelist; /* first free object */
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union {
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unsigned long counters;
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struct {
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unsigned inuse:16;
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unsigned objects:15;
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unsigned frozen:1;
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};
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};
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};
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#ifdef system_has_freelist_aba
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freelist_aba_t freelist_counter;
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#endif
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};
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};
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struct rcu_head rcu_head;
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};
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unsigned int __unused;
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atomic_t __page_refcount;
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#ifdef CONFIG_MEMCG
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unsigned long memcg_data;
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#endif
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};
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#define SLAB_MATCH(pg, sl) \
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static_assert(offsetof(struct page, pg) == offsetof(struct slab, sl))
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SLAB_MATCH(flags, __page_flags);
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SLAB_MATCH(compound_head, slab_cache); /* Ensure bit 0 is clear */
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SLAB_MATCH(_refcount, __page_refcount);
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#ifdef CONFIG_MEMCG
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SLAB_MATCH(memcg_data, memcg_data);
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#endif
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#undef SLAB_MATCH
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static_assert(sizeof(struct slab) <= sizeof(struct page));
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#if defined(system_has_freelist_aba)
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static_assert(IS_ALIGNED(offsetof(struct slab, freelist), sizeof(freelist_aba_t)));
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#endif
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/**
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* folio_slab - Converts from folio to slab.
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* @folio: The folio.
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*
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* Currently struct slab is a different representation of a folio where
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* folio_test_slab() is true.
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*
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* Return: The slab which contains this folio.
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*/
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#define folio_slab(folio) (_Generic((folio), \
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const struct folio *: (const struct slab *)(folio), \
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struct folio *: (struct slab *)(folio)))
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/**
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* slab_folio - The folio allocated for a slab
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* @slab: The slab.
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*
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* Slabs are allocated as folios that contain the individual objects and are
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* using some fields in the first struct page of the folio - those fields are
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* now accessed by struct slab. It is occasionally necessary to convert back to
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* a folio in order to communicate with the rest of the mm. Please use this
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* helper function instead of casting yourself, as the implementation may change
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* in the future.
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*/
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#define slab_folio(s) (_Generic((s), \
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const struct slab *: (const struct folio *)s, \
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struct slab *: (struct folio *)s))
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/**
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* page_slab - Converts from first struct page to slab.
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* @p: The first (either head of compound or single) page of slab.
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*
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* A temporary wrapper to convert struct page to struct slab in situations where
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* we know the page is the compound head, or single order-0 page.
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*
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* Long-term ideally everything would work with struct slab directly or go
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* through folio to struct slab.
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*
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* Return: The slab which contains this page
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*/
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#define page_slab(p) (_Generic((p), \
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const struct page *: (const struct slab *)(p), \
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struct page *: (struct slab *)(p)))
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/**
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* slab_page - The first struct page allocated for a slab
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* @slab: The slab.
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*
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* A convenience wrapper for converting slab to the first struct page of the
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* underlying folio, to communicate with code not yet converted to folio or
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* struct slab.
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*/
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#define slab_page(s) folio_page(slab_folio(s), 0)
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/*
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* If network-based swap is enabled, sl*b must keep track of whether pages
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* were allocated from pfmemalloc reserves.
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*/
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static inline bool slab_test_pfmemalloc(const struct slab *slab)
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{
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return folio_test_active((struct folio *)slab_folio(slab));
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}
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static inline void slab_set_pfmemalloc(struct slab *slab)
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{
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folio_set_active(slab_folio(slab));
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}
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static inline void slab_clear_pfmemalloc(struct slab *slab)
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{
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folio_clear_active(slab_folio(slab));
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}
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static inline void __slab_clear_pfmemalloc(struct slab *slab)
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{
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__folio_clear_active(slab_folio(slab));
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}
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static inline void *slab_address(const struct slab *slab)
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{
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return folio_address(slab_folio(slab));
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}
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static inline int slab_nid(const struct slab *slab)
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{
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return folio_nid(slab_folio(slab));
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}
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static inline pg_data_t *slab_pgdat(const struct slab *slab)
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{
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return folio_pgdat(slab_folio(slab));
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}
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static inline struct slab *virt_to_slab(const void *addr)
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{
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struct folio *folio = virt_to_folio(addr);
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if (!folio_test_slab(folio))
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return NULL;
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return folio_slab(folio);
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}
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static inline int slab_order(const struct slab *slab)
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{
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return folio_order((struct folio *)slab_folio(slab));
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}
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static inline size_t slab_size(const struct slab *slab)
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{
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return PAGE_SIZE << slab_order(slab);
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}
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#ifdef CONFIG_SLUB_CPU_PARTIAL
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#define slub_percpu_partial(c) ((c)->partial)
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#define slub_set_percpu_partial(c, p) \
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({ \
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slub_percpu_partial(c) = (p)->next; \
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})
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#define slub_percpu_partial_read_once(c) READ_ONCE(slub_percpu_partial(c))
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#else
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#define slub_percpu_partial(c) NULL
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#define slub_set_percpu_partial(c, p)
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#define slub_percpu_partial_read_once(c) NULL
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#endif // CONFIG_SLUB_CPU_PARTIAL
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/*
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* Word size structure that can be atomically updated or read and that
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* contains both the order and the number of objects that a slab of the
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* given order would contain.
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*/
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struct kmem_cache_order_objects {
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unsigned int x;
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};
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/*
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* Slab cache management.
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*/
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struct kmem_cache {
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#ifndef CONFIG_SLUB_TINY
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struct kmem_cache_cpu __percpu *cpu_slab;
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#endif
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/* Used for retrieving partial slabs, etc. */
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slab_flags_t flags;
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unsigned long min_partial;
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unsigned int size; /* Object size including metadata */
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unsigned int object_size; /* Object size without metadata */
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struct reciprocal_value reciprocal_size;
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unsigned int offset; /* Free pointer offset */
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#ifdef CONFIG_SLUB_CPU_PARTIAL
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/* Number of per cpu partial objects to keep around */
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unsigned int cpu_partial;
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/* Number of per cpu partial slabs to keep around */
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unsigned int cpu_partial_slabs;
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#endif
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struct kmem_cache_order_objects oo;
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/* Allocation and freeing of slabs */
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struct kmem_cache_order_objects min;
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gfp_t allocflags; /* gfp flags to use on each alloc */
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int refcount; /* Refcount for slab cache destroy */
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void (*ctor)(void *object); /* Object constructor */
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unsigned int inuse; /* Offset to metadata */
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unsigned int align; /* Alignment */
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unsigned int red_left_pad; /* Left redzone padding size */
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const char *name; /* Name (only for display!) */
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struct list_head list; /* List of slab caches */
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#ifdef CONFIG_SYSFS
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struct kobject kobj; /* For sysfs */
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#endif
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#ifdef CONFIG_SLAB_FREELIST_HARDENED
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unsigned long random;
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#endif
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#ifdef CONFIG_NUMA
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/*
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* Defragmentation by allocating from a remote node.
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*/
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unsigned int remote_node_defrag_ratio;
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#endif
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#ifdef CONFIG_SLAB_FREELIST_RANDOM
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unsigned int *random_seq;
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#endif
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#ifdef CONFIG_KASAN_GENERIC
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struct kasan_cache kasan_info;
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#endif
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#ifdef CONFIG_HARDENED_USERCOPY
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unsigned int useroffset; /* Usercopy region offset */
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unsigned int usersize; /* Usercopy region size */
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#endif
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struct kmem_cache_node *node[MAX_NUMNODES];
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};
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#if defined(CONFIG_SYSFS) && !defined(CONFIG_SLUB_TINY)
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#define SLAB_SUPPORTS_SYSFS
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void sysfs_slab_unlink(struct kmem_cache *s);
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void sysfs_slab_release(struct kmem_cache *s);
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#else
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static inline void sysfs_slab_unlink(struct kmem_cache *s) { }
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static inline void sysfs_slab_release(struct kmem_cache *s) { }
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#endif
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void *fixup_red_left(struct kmem_cache *s, void *p);
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static inline void *nearest_obj(struct kmem_cache *cache,
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const struct slab *slab, void *x)
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{
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void *object = x - (x - slab_address(slab)) % cache->size;
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void *last_object = slab_address(slab) +
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(slab->objects - 1) * cache->size;
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void *result = (unlikely(object > last_object)) ? last_object : object;
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result = fixup_red_left(cache, result);
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return result;
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}
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/* Determine object index from a given position */
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static inline unsigned int __obj_to_index(const struct kmem_cache *cache,
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void *addr, void *obj)
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{
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return reciprocal_divide(kasan_reset_tag(obj) - addr,
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cache->reciprocal_size);
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}
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static inline unsigned int obj_to_index(const struct kmem_cache *cache,
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const struct slab *slab, void *obj)
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{
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if (is_kfence_address(obj))
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return 0;
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return __obj_to_index(cache, slab_address(slab), obj);
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}
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static inline int objs_per_slab(const struct kmem_cache *cache,
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const struct slab *slab)
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{
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return slab->objects;
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}
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/*
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* State of the slab allocator.
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*
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* This is used to describe the states of the allocator during bootup.
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* Allocators use this to gradually bootstrap themselves. Most allocators
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* have the problem that the structures used for managing slab caches are
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* allocated from slab caches themselves.
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*/
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enum slab_state {
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DOWN, /* No slab functionality yet */
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PARTIAL, /* SLUB: kmem_cache_node available */
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UP, /* Slab caches usable but not all extras yet */
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FULL /* Everything is working */
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};
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extern enum slab_state slab_state;
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/* The slab cache mutex protects the management structures during changes */
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extern struct mutex slab_mutex;
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/* The list of all slab caches on the system */
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extern struct list_head slab_caches;
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/* The slab cache that manages slab cache information */
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extern struct kmem_cache *kmem_cache;
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/* A table of kmalloc cache names and sizes */
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extern const struct kmalloc_info_struct {
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const char *name[NR_KMALLOC_TYPES];
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unsigned int size;
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} kmalloc_info[];
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/* Kmalloc array related functions */
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void setup_kmalloc_cache_index_table(void);
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void create_kmalloc_caches(void);
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extern u8 kmalloc_size_index[24];
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static inline unsigned int size_index_elem(unsigned int bytes)
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{
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return (bytes - 1) / 8;
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}
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/*
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* Find the kmem_cache structure that serves a given size of
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* allocation
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*
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* This assumes size is larger than zero and not larger than
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* KMALLOC_MAX_CACHE_SIZE and the caller must check that.
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*/
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static inline struct kmem_cache *
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kmalloc_slab(size_t size, gfp_t flags, unsigned long caller)
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{
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unsigned int index;
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if (size <= 192)
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index = kmalloc_size_index[size_index_elem(size)];
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else
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index = fls(size - 1);
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return kmalloc_caches[kmalloc_type(flags, caller)][index];
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}
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gfp_t kmalloc_fix_flags(gfp_t flags);
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/* Functions provided by the slab allocators */
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int __kmem_cache_create(struct kmem_cache *, slab_flags_t flags);
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void __init kmem_cache_init(void);
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extern void create_boot_cache(struct kmem_cache *, const char *name,
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unsigned int size, slab_flags_t flags,
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unsigned int useroffset, unsigned int usersize);
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int slab_unmergeable(struct kmem_cache *s);
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struct kmem_cache *find_mergeable(unsigned size, unsigned align,
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slab_flags_t flags, const char *name, void (*ctor)(void *));
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struct kmem_cache *
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__kmem_cache_alias(const char *name, unsigned int size, unsigned int align,
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slab_flags_t flags, void (*ctor)(void *));
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slab_flags_t kmem_cache_flags(slab_flags_t flags, const char *name);
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static inline bool is_kmalloc_cache(struct kmem_cache *s)
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{
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return (s->flags & SLAB_KMALLOC);
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}
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/* Legal flag mask for kmem_cache_create(), for various configurations */
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#define SLAB_CORE_FLAGS (SLAB_HWCACHE_ALIGN | SLAB_CACHE_DMA | \
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SLAB_CACHE_DMA32 | SLAB_PANIC | \
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SLAB_TYPESAFE_BY_RCU | SLAB_DEBUG_OBJECTS )
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#ifdef CONFIG_SLUB_DEBUG
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#define SLAB_DEBUG_FLAGS (SLAB_RED_ZONE | SLAB_POISON | SLAB_STORE_USER | \
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SLAB_TRACE | SLAB_CONSISTENCY_CHECKS)
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#else
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#define SLAB_DEBUG_FLAGS (0)
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#endif
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#define SLAB_CACHE_FLAGS (SLAB_NOLEAKTRACE | SLAB_RECLAIM_ACCOUNT | \
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SLAB_TEMPORARY | SLAB_ACCOUNT | \
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SLAB_NO_USER_FLAGS | SLAB_KMALLOC | SLAB_NO_MERGE)
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/* Common flags available with current configuration */
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#define CACHE_CREATE_MASK (SLAB_CORE_FLAGS | SLAB_DEBUG_FLAGS | SLAB_CACHE_FLAGS)
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/* Common flags permitted for kmem_cache_create */
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#define SLAB_FLAGS_PERMITTED (SLAB_CORE_FLAGS | \
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SLAB_RED_ZONE | \
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SLAB_POISON | \
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SLAB_STORE_USER | \
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SLAB_TRACE | \
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SLAB_CONSISTENCY_CHECKS | \
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SLAB_NOLEAKTRACE | \
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SLAB_RECLAIM_ACCOUNT | \
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SLAB_TEMPORARY | \
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SLAB_ACCOUNT | \
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SLAB_KMALLOC | \
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SLAB_NO_MERGE | \
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SLAB_NO_USER_FLAGS)
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bool __kmem_cache_empty(struct kmem_cache *);
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int __kmem_cache_shutdown(struct kmem_cache *);
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void __kmem_cache_release(struct kmem_cache *);
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int __kmem_cache_shrink(struct kmem_cache *);
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void slab_kmem_cache_release(struct kmem_cache *);
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struct seq_file;
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struct file;
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struct slabinfo {
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unsigned long active_objs;
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unsigned long num_objs;
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unsigned long active_slabs;
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unsigned long num_slabs;
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unsigned long shared_avail;
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unsigned int limit;
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unsigned int batchcount;
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unsigned int shared;
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unsigned int objects_per_slab;
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unsigned int cache_order;
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};
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void get_slabinfo(struct kmem_cache *s, struct slabinfo *sinfo);
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void slabinfo_show_stats(struct seq_file *m, struct kmem_cache *s);
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ssize_t slabinfo_write(struct file *file, const char __user *buffer,
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size_t count, loff_t *ppos);
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#ifdef CONFIG_SLUB_DEBUG
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#ifdef CONFIG_SLUB_DEBUG_ON
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DECLARE_STATIC_KEY_TRUE(slub_debug_enabled);
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#else
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DECLARE_STATIC_KEY_FALSE(slub_debug_enabled);
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#endif
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extern void print_tracking(struct kmem_cache *s, void *object);
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long validate_slab_cache(struct kmem_cache *s);
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static inline bool __slub_debug_enabled(void)
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{
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return static_branch_unlikely(&slub_debug_enabled);
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}
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#else
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static inline void print_tracking(struct kmem_cache *s, void *object)
|
|
{
|
|
}
|
|
static inline bool __slub_debug_enabled(void)
|
|
{
|
|
return false;
|
|
}
|
|
#endif
|
|
|
|
/*
|
|
* Returns true if any of the specified slab_debug flags is enabled for the
|
|
* cache. Use only for flags parsed by setup_slub_debug() as it also enables
|
|
* the static key.
|
|
*/
|
|
static inline bool kmem_cache_debug_flags(struct kmem_cache *s, slab_flags_t flags)
|
|
{
|
|
if (IS_ENABLED(CONFIG_SLUB_DEBUG))
|
|
VM_WARN_ON_ONCE(!(flags & SLAB_DEBUG_FLAGS));
|
|
if (__slub_debug_enabled())
|
|
return s->flags & flags;
|
|
return false;
|
|
}
|
|
|
|
#ifdef CONFIG_MEMCG_KMEM
|
|
/*
|
|
* slab_objcgs - get the object cgroups vector associated with a slab
|
|
* @slab: a pointer to the slab struct
|
|
*
|
|
* Returns a pointer to the object cgroups vector associated with the slab,
|
|
* or NULL if no such vector has been associated yet.
|
|
*/
|
|
static inline struct obj_cgroup **slab_objcgs(struct slab *slab)
|
|
{
|
|
unsigned long memcg_data = READ_ONCE(slab->memcg_data);
|
|
|
|
VM_BUG_ON_PAGE(memcg_data && !(memcg_data & MEMCG_DATA_OBJCGS),
|
|
slab_page(slab));
|
|
VM_BUG_ON_PAGE(memcg_data & MEMCG_DATA_KMEM, slab_page(slab));
|
|
|
|
return (struct obj_cgroup **)(memcg_data & ~MEMCG_DATA_FLAGS_MASK);
|
|
}
|
|
|
|
int memcg_alloc_slab_cgroups(struct slab *slab, struct kmem_cache *s,
|
|
gfp_t gfp, bool new_slab);
|
|
void mod_objcg_state(struct obj_cgroup *objcg, struct pglist_data *pgdat,
|
|
enum node_stat_item idx, int nr);
|
|
#else /* CONFIG_MEMCG_KMEM */
|
|
static inline struct obj_cgroup **slab_objcgs(struct slab *slab)
|
|
{
|
|
return NULL;
|
|
}
|
|
|
|
static inline int memcg_alloc_slab_cgroups(struct slab *slab,
|
|
struct kmem_cache *s, gfp_t gfp,
|
|
bool new_slab)
|
|
{
|
|
return 0;
|
|
}
|
|
#endif /* CONFIG_MEMCG_KMEM */
|
|
|
|
size_t __ksize(const void *objp);
|
|
|
|
static inline size_t slab_ksize(const struct kmem_cache *s)
|
|
{
|
|
#ifdef CONFIG_SLUB_DEBUG
|
|
/*
|
|
* Debugging requires use of the padding between object
|
|
* and whatever may come after it.
|
|
*/
|
|
if (s->flags & (SLAB_RED_ZONE | SLAB_POISON))
|
|
return s->object_size;
|
|
#endif
|
|
if (s->flags & SLAB_KASAN)
|
|
return s->object_size;
|
|
/*
|
|
* If we have the need to store the freelist pointer
|
|
* back there or track user information then we can
|
|
* only use the space before that information.
|
|
*/
|
|
if (s->flags & (SLAB_TYPESAFE_BY_RCU | SLAB_STORE_USER))
|
|
return s->inuse;
|
|
/*
|
|
* Else we can use all the padding etc for the allocation
|
|
*/
|
|
return s->size;
|
|
}
|
|
|
|
#ifdef CONFIG_SLUB_DEBUG
|
|
void dump_unreclaimable_slab(void);
|
|
#else
|
|
static inline void dump_unreclaimable_slab(void)
|
|
{
|
|
}
|
|
#endif
|
|
|
|
void ___cache_free(struct kmem_cache *cache, void *x, unsigned long addr);
|
|
|
|
#ifdef CONFIG_SLAB_FREELIST_RANDOM
|
|
int cache_random_seq_create(struct kmem_cache *cachep, unsigned int count,
|
|
gfp_t gfp);
|
|
void cache_random_seq_destroy(struct kmem_cache *cachep);
|
|
#else
|
|
static inline int cache_random_seq_create(struct kmem_cache *cachep,
|
|
unsigned int count, gfp_t gfp)
|
|
{
|
|
return 0;
|
|
}
|
|
static inline void cache_random_seq_destroy(struct kmem_cache *cachep) { }
|
|
#endif /* CONFIG_SLAB_FREELIST_RANDOM */
|
|
|
|
static inline bool slab_want_init_on_alloc(gfp_t flags, struct kmem_cache *c)
|
|
{
|
|
if (static_branch_maybe(CONFIG_INIT_ON_ALLOC_DEFAULT_ON,
|
|
&init_on_alloc)) {
|
|
if (c->ctor)
|
|
return false;
|
|
if (c->flags & (SLAB_TYPESAFE_BY_RCU | SLAB_POISON))
|
|
return flags & __GFP_ZERO;
|
|
return true;
|
|
}
|
|
return flags & __GFP_ZERO;
|
|
}
|
|
|
|
static inline bool slab_want_init_on_free(struct kmem_cache *c)
|
|
{
|
|
if (static_branch_maybe(CONFIG_INIT_ON_FREE_DEFAULT_ON,
|
|
&init_on_free))
|
|
return !(c->ctor ||
|
|
(c->flags & (SLAB_TYPESAFE_BY_RCU | SLAB_POISON)));
|
|
return false;
|
|
}
|
|
|
|
#if defined(CONFIG_DEBUG_FS) && defined(CONFIG_SLUB_DEBUG)
|
|
void debugfs_slab_release(struct kmem_cache *);
|
|
#else
|
|
static inline void debugfs_slab_release(struct kmem_cache *s) { }
|
|
#endif
|
|
|
|
#ifdef CONFIG_PRINTK
|
|
#define KS_ADDRS_COUNT 16
|
|
struct kmem_obj_info {
|
|
void *kp_ptr;
|
|
struct slab *kp_slab;
|
|
void *kp_objp;
|
|
unsigned long kp_data_offset;
|
|
struct kmem_cache *kp_slab_cache;
|
|
void *kp_ret;
|
|
void *kp_stack[KS_ADDRS_COUNT];
|
|
void *kp_free_stack[KS_ADDRS_COUNT];
|
|
};
|
|
void __kmem_obj_info(struct kmem_obj_info *kpp, void *object, struct slab *slab);
|
|
#endif
|
|
|
|
void __check_heap_object(const void *ptr, unsigned long n,
|
|
const struct slab *slab, bool to_user);
|
|
|
|
#ifdef CONFIG_SLUB_DEBUG
|
|
void skip_orig_size_check(struct kmem_cache *s, const void *object);
|
|
#endif
|
|
|
|
#endif /* MM_SLAB_H */
|