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#ifndef _LINUX_JUMP_LABEL_H
#define _LINUX_JUMP_LABEL_H
/*
* Jump label support
*
* Copyright (C) 2009-2012 Jason Baron <jbaron@redhat.com>
* Copyright (C) 2011-2012 Peter Zijlstra <pzijlstr@redhat.com>
*
* Jump labels provide an interface to generate dynamic branches using
* self-modifying code. Assuming toolchain and architecture support the result
* of a "if (static_key_false(&key))" statement is a unconditional branch (which
* defaults to false - and the true block is placed out of line).
*
* However at runtime we can change the branch target using
* static_key_slow_{inc,dec}(). These function as a 'reference' count on the key
* object and for as long as there are references all branches referring to
* that particular key will point to the (out of line) true block.
*
* Since this relies on modifying code the static_key_slow_{inc,dec}() functions
* must be considered absolute slow paths (machine wide synchronization etc.).
* OTOH, since the affected branches are unconditional their runtime overhead
* will be absolutely minimal, esp. in the default (off) case where the total
* effect is a single NOP of appropriate size. The on case will patch in a jump
* to the out-of-line block.
*
* When the control is directly exposed to userspace it is prudent to delay the
* decrement to avoid high frequency code modifications which can (and do)
* cause significant performance degradation. Struct static_key_deferred and
* static_key_slow_dec_deferred() provide for this.
*
* Lacking toolchain and or architecture support, it falls back to a simple
* conditional branch.
*
* struct static_key my_key = STATIC_KEY_INIT_TRUE;
*
* if (static_key_true(&my_key)) {
* }
*
* will result in the true case being in-line and starts the key with a single
* reference. Mixing static_key_true() and static_key_false() on the same key is not
* allowed.
*
* Not initializing the key (static data is initialized to 0s anyway) is the
* same as using STATIC_KEY_INIT_FALSE.
*
*/
#if defined(CC_HAVE_ASM_GOTO) && defined(CONFIG_JUMP_LABEL)
# define HAVE_JUMP_LABEL
#endif
#ifndef __ASSEMBLY__
#include <linux/types.h>
#include <linux/compiler.h>
#include <linux/bug.h>
extern bool static_key_initialized;
#define STATIC_KEY_CHECK_USE() WARN(!static_key_initialized, \
"%s used before call to jump_label_init", \
__func__)
#ifdef HAVE_JUMP_LABEL
struct static_key {
atomic_t enabled;
/* Set lsb bit to 1 if branch is default true, 0 ot */
struct jump_entry *entries;
#ifdef CONFIG_MODULES
struct static_key_mod *next;
#endif
};
#else
struct static_key {
atomic_t enabled;
};
#endif /* HAVE_JUMP_LABEL */
#endif /* __ASSEMBLY__ */
#ifdef HAVE_JUMP_LABEL
#include <asm/jump_label.h>
#endif
#ifndef __ASSEMBLY__
enum jump_label_type {
JUMP_LABEL_DISABLE = 0,
JUMP_LABEL_ENABLE,
};
struct module;
#include <linux/atomic.h>
#ifdef HAVE_JUMP_LABEL
static inline int static_key_count(struct static_key *key)
{
/*
* -1 means the first static_key_slow_inc() is in progress.
* static_key_enabled() must return true, so return 1 here.
*/
int n = atomic_read(&key->enabled);
return n >= 0 ? n : 1;
}
#define JUMP_LABEL_TRUE_BRANCH 1UL
static
inline struct jump_entry *jump_label_get_entries(struct static_key *key)
{
return (struct jump_entry *)((unsigned long)key->entries
& ~JUMP_LABEL_TRUE_BRANCH);
}
static inline bool jump_label_get_branch_default(struct static_key *key)
{
if ((unsigned long)key->entries & JUMP_LABEL_TRUE_BRANCH)
return true;
return false;
}
static __always_inline bool static_key_false(struct static_key *key)
{
return arch_static_branch(key);
}
static __always_inline bool static_key_true(struct static_key *key)
{
return !static_key_false(key);
}
extern struct jump_entry __start___jump_table[];
extern struct jump_entry __stop___jump_table[];
extern void jump_label_init(void);
extern void jump_label_lock(void);
extern void jump_label_unlock(void);
extern void arch_jump_label_transform(struct jump_entry *entry,
enum jump_label_type type);
extern void arch_jump_label_transform_static(struct jump_entry *entry,
enum jump_label_type type);
extern int jump_label_text_reserved(void *start, void *end);
extern void static_key_slow_inc(struct static_key *key);
extern void static_key_slow_dec(struct static_key *key);
extern void jump_label_apply_nops(struct module *mod);
#define STATIC_KEY_INIT_TRUE ((struct static_key) \
{ .enabled = ATOMIC_INIT(1), .entries = (void *)1 })
#define STATIC_KEY_INIT_FALSE ((struct static_key) \
{ .enabled = ATOMIC_INIT(0), .entries = (void *)0 })
#else /* !HAVE_JUMP_LABEL */
static inline int static_key_count(struct static_key *key)
{
return atomic_read(&key->enabled);
}
static __always_inline void jump_label_init(void)
{
static_key_initialized = true;
}
static __always_inline bool static_key_false(struct static_key *key)
{
if (unlikely(static_key_count(key) > 0))
return true;
return false;
}
static __always_inline bool static_key_true(struct static_key *key)
{
if (likely(static_key_count(key) > 0))
return true;
return false;
}
static inline void static_key_slow_inc(struct static_key *key)
{
STATIC_KEY_CHECK_USE();
atomic_inc(&key->enabled);
}
static inline void static_key_slow_dec(struct static_key *key)
{
STATIC_KEY_CHECK_USE();
atomic_dec(&key->enabled);
}
static inline int jump_label_text_reserved(void *start, void *end)
{
return 0;
}
static inline void jump_label_lock(void) {}
static inline void jump_label_unlock(void) {}
static inline int jump_label_apply_nops(struct module *mod)
{
return 0;
}
#define STATIC_KEY_INIT_TRUE ((struct static_key) \
{ .enabled = ATOMIC_INIT(1) })
#define STATIC_KEY_INIT_FALSE ((struct static_key) \
{ .enabled = ATOMIC_INIT(0) })
#endif /* HAVE_JUMP_LABEL */
#define STATIC_KEY_INIT STATIC_KEY_INIT_FALSE
#define jump_label_enabled static_key_enabled
static inline bool static_key_enabled(struct static_key *key)
{
return static_key_count(key) > 0;
}
static inline void static_key_enable(struct static_key *key)
{
int count = static_key_count(key);
WARN_ON_ONCE(count < 0 || count > 1);
if (!count)
static_key_slow_inc(key);
}
static inline void static_key_disable(struct static_key *key)
{
int count = static_key_count(key);
WARN_ON_ONCE(count < 0 || count > 1);
if (count)
static_key_slow_dec(key);
}
#define DEFINE_STATIC_KEY_TRUE(name) \
struct static_key name = STATIC_KEY_INIT_TRUE
#define DECLARE_STATIC_KEY_TRUE(name) \
extern struct static_key name
#define DEFINE_STATIC_KEY_FALSE(name) \
struct static_key name = STATIC_KEY_INIT_FALSE
#define DECLARE_STATIC_KEY_FALSE(name) \
extern struct static_key name
#ifdef HAVE_JUMP_LABEL
/*
* juergh: Helper #defines to (hopefully) prevent mistakes when using the
* convoluted static key API. The current API only allows for the two
* combinations below which execute without taking an uncoditional branch.
* Note, that a new API was introduced later with commit 11276d5306b8
* ("locking/static_keys: Add a new static_key interface").
*/
#define static_branch_unlikely_init_false(x) static_key_false(x)
#define static_branch_likely_init_true(x) static_key_true(x)
/*
* juergh: Add more helper #defines to work around the static key API.
* Note, that the following are 'unoptimized' #defines due to the limitation
* of the current/old static key API.
*/
#define static_branch_likely_init_false(x) likely(static_key_enabled(x))
#define static_branch_unlikely_init_true(x) unlikely(static_key_enabled(x))
#else /* !HAVE_JUMP_LABEL */
#define static_branch_likely_init_false(x) likely(static_key_enabled(x))
#define static_branch_likely_init_true(x) likely(static_key_enabled(x))
#define static_branch_unlikely_init_false(x) unlikely(static_key_enabled(x))
#define static_branch_unlikely_init_true(x) unlikely(static_key_enabled(x))
#endif
/*
* Advanced usage; refcount, branch is enabled when: count != 0
*/
#define static_branch_inc(x) static_key_slow_inc(x)
#define static_branch_dec(x) static_key_slow_dec(x)
/*
* Normal usage; boolean enable/disable.
*/
#define static_branch_enable(x) static_key_enable(x)
#define static_branch_disable(x) static_key_disable(x)
/*
* Advanced usage; refcount, branch is enabled when: count != 0
*/
#define static_branch_inc(x) static_key_slow_inc(x)
#define static_branch_dec(x) static_key_slow_dec(x)
#endif /* _LINUX_JUMP_LABEL_H */
#endif /* __ASSEMBLY__ */