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/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _LINUX_PAGE_REF_H
#define _LINUX_PAGE_REF_H
#include <linux/atomic.h>
#include <linux/mm_types.h>
#include <linux/page-flags.h>
#include <linux/tracepoint-defs.h>
DECLARE_TRACEPOINT(page_ref_set);
DECLARE_TRACEPOINT(page_ref_mod);
DECLARE_TRACEPOINT(page_ref_mod_and_test);
DECLARE_TRACEPOINT(page_ref_mod_and_return);
DECLARE_TRACEPOINT(page_ref_mod_unless);
DECLARE_TRACEPOINT(page_ref_freeze);
DECLARE_TRACEPOINT(page_ref_unfreeze);
#ifdef CONFIG_DEBUG_PAGE_REF
/*
* Ideally we would want to use the trace_<tracepoint>_enabled() helper
* functions. But due to include header file issues, that is not
* feasible. Instead we have to open code the static key functions.
*
* See trace_##name##_enabled(void) in include/linux/tracepoint.h
*/
#define page_ref_tracepoint_active(t) tracepoint_enabled(t)
extern void __page_ref_set(struct page *page, int v);
extern void __page_ref_mod(struct page *page, int v);
extern void __page_ref_mod_and_test(struct page *page, int v, int ret);
extern void __page_ref_mod_and_return(struct page *page, int v, int ret);
extern void __page_ref_mod_unless(struct page *page, int v, int u);
extern void __page_ref_freeze(struct page *page, int v, int ret);
extern void __page_ref_unfreeze(struct page *page, int v);
#else
#define page_ref_tracepoint_active(t) false
static inline void __page_ref_set(struct page *page, int v)
{
}
static inline void __page_ref_mod(struct page *page, int v)
{
}
static inline void __page_ref_mod_and_test(struct page *page, int v, int ret)
{
}
static inline void __page_ref_mod_and_return(struct page *page, int v, int ret)
{
}
static inline void __page_ref_mod_unless(struct page *page, int v, int u)
{
}
static inline void __page_ref_freeze(struct page *page, int v, int ret)
{
}
static inline void __page_ref_unfreeze(struct page *page, int v)
{
}
#endif
static inline int page_ref_count(const struct page *page)
{
return atomic_read(&page->_refcount);
}
/**
* folio_ref_count - The reference count on this folio.
* @folio: The folio.
*
* The refcount is usually incremented by calls to folio_get() and
* decremented by calls to folio_put(). Some typical users of the
* folio refcount:
*
* - Each reference from a page table
* - The page cache
* - Filesystem private data
* - The LRU list
* - Pipes
* - Direct IO which references this page in the process address space
*
* Return: The number of references to this folio.
*/
static inline int folio_ref_count(const struct folio *folio)
{
return page_ref_count(&folio->page);
}
static inline int page_count(const struct page *page)
{
return folio_ref_count(page_folio(page));
}
static inline void set_page_count(struct page *page, int v)
{
atomic_set(&page->_refcount, v);
if (page_ref_tracepoint_active(page_ref_set))
__page_ref_set(page, v);
}
static inline void folio_set_count(struct folio *folio, int v)
{
set_page_count(&folio->page, v);
}
/*
* Setup the page count before being freed into the page allocator for
* the first time (boot or memory hotplug)
*/
static inline void init_page_count(struct page *page)
{
set_page_count(page, 1);
}
static inline void page_ref_add(struct page *page, int nr)
{
atomic_add(nr, &page->_refcount);
if (page_ref_tracepoint_active(page_ref_mod))
__page_ref_mod(page, nr);
}
static inline void folio_ref_add(struct folio *folio, int nr)
{
page_ref_add(&folio->page, nr);
}
static inline void page_ref_sub(struct page *page, int nr)
{
atomic_sub(nr, &page->_refcount);
if (page_ref_tracepoint_active(page_ref_mod))
__page_ref_mod(page, -nr);
}
static inline void folio_ref_sub(struct folio *folio, int nr)
{
page_ref_sub(&folio->page, nr);
}
static inline int page_ref_sub_return(struct page *page, int nr)
{
int ret = atomic_sub_return(nr, &page->_refcount);
if (page_ref_tracepoint_active(page_ref_mod_and_return))
__page_ref_mod_and_return(page, -nr, ret);
return ret;
}
static inline int folio_ref_sub_return(struct folio *folio, int nr)
{
return page_ref_sub_return(&folio->page, nr);
}
static inline void page_ref_inc(struct page *page)
{
atomic_inc(&page->_refcount);
if (page_ref_tracepoint_active(page_ref_mod))
__page_ref_mod(page, 1);
}
static inline void folio_ref_inc(struct folio *folio)
{
page_ref_inc(&folio->page);
}
static inline void page_ref_dec(struct page *page)
{
atomic_dec(&page->_refcount);
if (page_ref_tracepoint_active(page_ref_mod))
__page_ref_mod(page, -1);
}
static inline void folio_ref_dec(struct folio *folio)
{
page_ref_dec(&folio->page);
}
static inline int page_ref_sub_and_test(struct page *page, int nr)
{
int ret = atomic_sub_and_test(nr, &page->_refcount);
if (page_ref_tracepoint_active(page_ref_mod_and_test))
__page_ref_mod_and_test(page, -nr, ret);
return ret;
}
static inline int folio_ref_sub_and_test(struct folio *folio, int nr)
{
return page_ref_sub_and_test(&folio->page, nr);
}
static inline int page_ref_inc_return(struct page *page)
{
int ret = atomic_inc_return(&page->_refcount);
if (page_ref_tracepoint_active(page_ref_mod_and_return))
__page_ref_mod_and_return(page, 1, ret);
return ret;
}
static inline int folio_ref_inc_return(struct folio *folio)
{
return page_ref_inc_return(&folio->page);
}
static inline int page_ref_dec_and_test(struct page *page)
{
int ret = atomic_dec_and_test(&page->_refcount);
if (page_ref_tracepoint_active(page_ref_mod_and_test))
__page_ref_mod_and_test(page, -1, ret);
return ret;
}
static inline int folio_ref_dec_and_test(struct folio *folio)
{
return page_ref_dec_and_test(&folio->page);
}
static inline int page_ref_dec_return(struct page *page)
{
int ret = atomic_dec_return(&page->_refcount);
if (page_ref_tracepoint_active(page_ref_mod_and_return))
__page_ref_mod_and_return(page, -1, ret);
return ret;
}
static inline int folio_ref_dec_return(struct folio *folio)
{
return page_ref_dec_return(&folio->page);
}
static inline bool page_ref_add_unless(struct page *page, int nr, int u)
{
bool ret = atomic_add_unless(&page->_refcount, nr, u);
if (page_ref_tracepoint_active(page_ref_mod_unless))
__page_ref_mod_unless(page, nr, ret);
return ret;
}
static inline bool folio_ref_add_unless(struct folio *folio, int nr, int u)
{
return page_ref_add_unless(&folio->page, nr, u);
}
/**
* folio_try_get - Attempt to increase the refcount on a folio.
* @folio: The folio.
*
* If you do not already have a reference to a folio, you can attempt to
* get one using this function. It may fail if, for example, the folio
* has been freed since you found a pointer to it, or it is frozen for
* the purposes of splitting or migration.
*
* Return: True if the reference count was successfully incremented.
*/
static inline bool folio_try_get(struct folio *folio)
{
return folio_ref_add_unless(folio, 1, 0);
}
static inline bool folio_ref_try_add(struct folio *folio, int count)
{
return folio_ref_add_unless(folio, count, 0);
}
static inline int page_ref_freeze(struct page *page, int count)
{
int ret = likely(atomic_cmpxchg(&page->_refcount, count, 0) == count);
if (page_ref_tracepoint_active(page_ref_freeze))
__page_ref_freeze(page, count, ret);
return ret;
}
static inline int folio_ref_freeze(struct folio *folio, int count)
{
return page_ref_freeze(&folio->page, count);
}
static inline void page_ref_unfreeze(struct page *page, int count)
{
VM_BUG_ON_PAGE(page_count(page) != 0, page);
VM_BUG_ON(count == 0);
atomic_set_release(&page->_refcount, count);
if (page_ref_tracepoint_active(page_ref_unfreeze))
__page_ref_unfreeze(page, count);
}
static inline void folio_ref_unfreeze(struct folio *folio, int count)
{
page_ref_unfreeze(&folio->page, count);
}
#endif