365 строки
8.5 KiB
C
365 строки
8.5 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
|
|
#ifndef _LINUX_SWAPOPS_H
|
|
#define _LINUX_SWAPOPS_H
|
|
|
|
#include <linux/radix-tree.h>
|
|
#include <linux/bug.h>
|
|
#include <linux/mm_types.h>
|
|
|
|
#ifdef CONFIG_MMU
|
|
|
|
/*
|
|
* swapcache pages are stored in the swapper_space radix tree. We want to
|
|
* get good packing density in that tree, so the index should be dense in
|
|
* the low-order bits.
|
|
*
|
|
* We arrange the `type' and `offset' fields so that `type' is at the seven
|
|
* high-order bits of the swp_entry_t and `offset' is right-aligned in the
|
|
* remaining bits. Although `type' itself needs only five bits, we allow for
|
|
* shmem/tmpfs to shift it all up a further two bits: see swp_to_radix_entry().
|
|
*
|
|
* swp_entry_t's are *never* stored anywhere in their arch-dependent format.
|
|
*/
|
|
#define SWP_TYPE_SHIFT (BITS_PER_XA_VALUE - MAX_SWAPFILES_SHIFT)
|
|
#define SWP_OFFSET_MASK ((1UL << SWP_TYPE_SHIFT) - 1)
|
|
|
|
/*
|
|
* Store a type+offset into a swp_entry_t in an arch-independent format
|
|
*/
|
|
static inline swp_entry_t swp_entry(unsigned long type, pgoff_t offset)
|
|
{
|
|
swp_entry_t ret;
|
|
|
|
ret.val = (type << SWP_TYPE_SHIFT) | (offset & SWP_OFFSET_MASK);
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* Extract the `type' field from a swp_entry_t. The swp_entry_t is in
|
|
* arch-independent format
|
|
*/
|
|
static inline unsigned swp_type(swp_entry_t entry)
|
|
{
|
|
return (entry.val >> SWP_TYPE_SHIFT);
|
|
}
|
|
|
|
/*
|
|
* Extract the `offset' field from a swp_entry_t. The swp_entry_t is in
|
|
* arch-independent format
|
|
*/
|
|
static inline pgoff_t swp_offset(swp_entry_t entry)
|
|
{
|
|
return entry.val & SWP_OFFSET_MASK;
|
|
}
|
|
|
|
/* check whether a pte points to a swap entry */
|
|
static inline int is_swap_pte(pte_t pte)
|
|
{
|
|
return !pte_none(pte) && !pte_present(pte);
|
|
}
|
|
|
|
/*
|
|
* Convert the arch-dependent pte representation of a swp_entry_t into an
|
|
* arch-independent swp_entry_t.
|
|
*/
|
|
static inline swp_entry_t pte_to_swp_entry(pte_t pte)
|
|
{
|
|
swp_entry_t arch_entry;
|
|
|
|
if (pte_swp_soft_dirty(pte))
|
|
pte = pte_swp_clear_soft_dirty(pte);
|
|
arch_entry = __pte_to_swp_entry(pte);
|
|
return swp_entry(__swp_type(arch_entry), __swp_offset(arch_entry));
|
|
}
|
|
|
|
/*
|
|
* Convert the arch-independent representation of a swp_entry_t into the
|
|
* arch-dependent pte representation.
|
|
*/
|
|
static inline pte_t swp_entry_to_pte(swp_entry_t entry)
|
|
{
|
|
swp_entry_t arch_entry;
|
|
|
|
arch_entry = __swp_entry(swp_type(entry), swp_offset(entry));
|
|
return __swp_entry_to_pte(arch_entry);
|
|
}
|
|
|
|
static inline swp_entry_t radix_to_swp_entry(void *arg)
|
|
{
|
|
swp_entry_t entry;
|
|
|
|
entry.val = xa_to_value(arg);
|
|
return entry;
|
|
}
|
|
|
|
static inline void *swp_to_radix_entry(swp_entry_t entry)
|
|
{
|
|
return xa_mk_value(entry.val);
|
|
}
|
|
|
|
#if IS_ENABLED(CONFIG_DEVICE_PRIVATE)
|
|
static inline swp_entry_t make_device_private_entry(struct page *page, bool write)
|
|
{
|
|
return swp_entry(write ? SWP_DEVICE_WRITE : SWP_DEVICE_READ,
|
|
page_to_pfn(page));
|
|
}
|
|
|
|
static inline bool is_device_private_entry(swp_entry_t entry)
|
|
{
|
|
int type = swp_type(entry);
|
|
return type == SWP_DEVICE_READ || type == SWP_DEVICE_WRITE;
|
|
}
|
|
|
|
static inline void make_device_private_entry_read(swp_entry_t *entry)
|
|
{
|
|
*entry = swp_entry(SWP_DEVICE_READ, swp_offset(*entry));
|
|
}
|
|
|
|
static inline bool is_write_device_private_entry(swp_entry_t entry)
|
|
{
|
|
return unlikely(swp_type(entry) == SWP_DEVICE_WRITE);
|
|
}
|
|
|
|
static inline unsigned long device_private_entry_to_pfn(swp_entry_t entry)
|
|
{
|
|
return swp_offset(entry);
|
|
}
|
|
|
|
static inline struct page *device_private_entry_to_page(swp_entry_t entry)
|
|
{
|
|
return pfn_to_page(swp_offset(entry));
|
|
}
|
|
#else /* CONFIG_DEVICE_PRIVATE */
|
|
static inline swp_entry_t make_device_private_entry(struct page *page, bool write)
|
|
{
|
|
return swp_entry(0, 0);
|
|
}
|
|
|
|
static inline void make_device_private_entry_read(swp_entry_t *entry)
|
|
{
|
|
}
|
|
|
|
static inline bool is_device_private_entry(swp_entry_t entry)
|
|
{
|
|
return false;
|
|
}
|
|
|
|
static inline bool is_write_device_private_entry(swp_entry_t entry)
|
|
{
|
|
return false;
|
|
}
|
|
|
|
static inline unsigned long device_private_entry_to_pfn(swp_entry_t entry)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
static inline struct page *device_private_entry_to_page(swp_entry_t entry)
|
|
{
|
|
return NULL;
|
|
}
|
|
#endif /* CONFIG_DEVICE_PRIVATE */
|
|
|
|
#ifdef CONFIG_MIGRATION
|
|
static inline swp_entry_t make_migration_entry(struct page *page, int write)
|
|
{
|
|
BUG_ON(!PageLocked(compound_head(page)));
|
|
|
|
return swp_entry(write ? SWP_MIGRATION_WRITE : SWP_MIGRATION_READ,
|
|
page_to_pfn(page));
|
|
}
|
|
|
|
static inline int is_migration_entry(swp_entry_t entry)
|
|
{
|
|
return unlikely(swp_type(entry) == SWP_MIGRATION_READ ||
|
|
swp_type(entry) == SWP_MIGRATION_WRITE);
|
|
}
|
|
|
|
static inline int is_write_migration_entry(swp_entry_t entry)
|
|
{
|
|
return unlikely(swp_type(entry) == SWP_MIGRATION_WRITE);
|
|
}
|
|
|
|
static inline unsigned long migration_entry_to_pfn(swp_entry_t entry)
|
|
{
|
|
return swp_offset(entry);
|
|
}
|
|
|
|
static inline struct page *migration_entry_to_page(swp_entry_t entry)
|
|
{
|
|
struct page *p = pfn_to_page(swp_offset(entry));
|
|
/*
|
|
* Any use of migration entries may only occur while the
|
|
* corresponding page is locked
|
|
*/
|
|
BUG_ON(!PageLocked(compound_head(p)));
|
|
return p;
|
|
}
|
|
|
|
static inline void make_migration_entry_read(swp_entry_t *entry)
|
|
{
|
|
*entry = swp_entry(SWP_MIGRATION_READ, swp_offset(*entry));
|
|
}
|
|
|
|
extern void __migration_entry_wait(struct mm_struct *mm, pte_t *ptep,
|
|
spinlock_t *ptl);
|
|
extern void migration_entry_wait(struct mm_struct *mm, pmd_t *pmd,
|
|
unsigned long address);
|
|
extern void migration_entry_wait_huge(struct vm_area_struct *vma,
|
|
struct mm_struct *mm, pte_t *pte);
|
|
#else
|
|
|
|
#define make_migration_entry(page, write) swp_entry(0, 0)
|
|
static inline int is_migration_entry(swp_entry_t swp)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
static inline unsigned long migration_entry_to_pfn(swp_entry_t entry)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
static inline struct page *migration_entry_to_page(swp_entry_t entry)
|
|
{
|
|
return NULL;
|
|
}
|
|
|
|
static inline void make_migration_entry_read(swp_entry_t *entryp) { }
|
|
static inline void __migration_entry_wait(struct mm_struct *mm, pte_t *ptep,
|
|
spinlock_t *ptl) { }
|
|
static inline void migration_entry_wait(struct mm_struct *mm, pmd_t *pmd,
|
|
unsigned long address) { }
|
|
static inline void migration_entry_wait_huge(struct vm_area_struct *vma,
|
|
struct mm_struct *mm, pte_t *pte) { }
|
|
static inline int is_write_migration_entry(swp_entry_t entry)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
#endif
|
|
|
|
struct page_vma_mapped_walk;
|
|
|
|
#ifdef CONFIG_ARCH_ENABLE_THP_MIGRATION
|
|
extern void set_pmd_migration_entry(struct page_vma_mapped_walk *pvmw,
|
|
struct page *page);
|
|
|
|
extern void remove_migration_pmd(struct page_vma_mapped_walk *pvmw,
|
|
struct page *new);
|
|
|
|
extern void pmd_migration_entry_wait(struct mm_struct *mm, pmd_t *pmd);
|
|
|
|
static inline swp_entry_t pmd_to_swp_entry(pmd_t pmd)
|
|
{
|
|
swp_entry_t arch_entry;
|
|
|
|
if (pmd_swp_soft_dirty(pmd))
|
|
pmd = pmd_swp_clear_soft_dirty(pmd);
|
|
arch_entry = __pmd_to_swp_entry(pmd);
|
|
return swp_entry(__swp_type(arch_entry), __swp_offset(arch_entry));
|
|
}
|
|
|
|
static inline pmd_t swp_entry_to_pmd(swp_entry_t entry)
|
|
{
|
|
swp_entry_t arch_entry;
|
|
|
|
arch_entry = __swp_entry(swp_type(entry), swp_offset(entry));
|
|
return __swp_entry_to_pmd(arch_entry);
|
|
}
|
|
|
|
static inline int is_pmd_migration_entry(pmd_t pmd)
|
|
{
|
|
return !pmd_present(pmd) && is_migration_entry(pmd_to_swp_entry(pmd));
|
|
}
|
|
#else
|
|
static inline void set_pmd_migration_entry(struct page_vma_mapped_walk *pvmw,
|
|
struct page *page)
|
|
{
|
|
BUILD_BUG();
|
|
}
|
|
|
|
static inline void remove_migration_pmd(struct page_vma_mapped_walk *pvmw,
|
|
struct page *new)
|
|
{
|
|
BUILD_BUG();
|
|
}
|
|
|
|
static inline void pmd_migration_entry_wait(struct mm_struct *m, pmd_t *p) { }
|
|
|
|
static inline swp_entry_t pmd_to_swp_entry(pmd_t pmd)
|
|
{
|
|
return swp_entry(0, 0);
|
|
}
|
|
|
|
static inline pmd_t swp_entry_to_pmd(swp_entry_t entry)
|
|
{
|
|
return __pmd(0);
|
|
}
|
|
|
|
static inline int is_pmd_migration_entry(pmd_t pmd)
|
|
{
|
|
return 0;
|
|
}
|
|
#endif
|
|
|
|
#ifdef CONFIG_MEMORY_FAILURE
|
|
|
|
extern atomic_long_t num_poisoned_pages __read_mostly;
|
|
|
|
/*
|
|
* Support for hardware poisoned pages
|
|
*/
|
|
static inline swp_entry_t make_hwpoison_entry(struct page *page)
|
|
{
|
|
BUG_ON(!PageLocked(page));
|
|
return swp_entry(SWP_HWPOISON, page_to_pfn(page));
|
|
}
|
|
|
|
static inline int is_hwpoison_entry(swp_entry_t entry)
|
|
{
|
|
return swp_type(entry) == SWP_HWPOISON;
|
|
}
|
|
|
|
static inline void num_poisoned_pages_inc(void)
|
|
{
|
|
atomic_long_inc(&num_poisoned_pages);
|
|
}
|
|
|
|
static inline void num_poisoned_pages_dec(void)
|
|
{
|
|
atomic_long_dec(&num_poisoned_pages);
|
|
}
|
|
|
|
#else
|
|
|
|
static inline swp_entry_t make_hwpoison_entry(struct page *page)
|
|
{
|
|
return swp_entry(0, 0);
|
|
}
|
|
|
|
static inline int is_hwpoison_entry(swp_entry_t swp)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
static inline void num_poisoned_pages_inc(void)
|
|
{
|
|
}
|
|
#endif
|
|
|
|
#if defined(CONFIG_MEMORY_FAILURE) || defined(CONFIG_MIGRATION)
|
|
static inline int non_swap_entry(swp_entry_t entry)
|
|
{
|
|
return swp_type(entry) >= MAX_SWAPFILES;
|
|
}
|
|
#else
|
|
static inline int non_swap_entry(swp_entry_t entry)
|
|
{
|
|
return 0;
|
|
}
|
|
#endif
|
|
|
|
#endif /* CONFIG_MMU */
|
|
#endif /* _LINUX_SWAPOPS_H */
|