233 строки
7.5 KiB
C
233 строки
7.5 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
|
|
#ifndef _LINUX_MIGRATE_H
|
|
#define _LINUX_MIGRATE_H
|
|
|
|
#include <linux/mm.h>
|
|
#include <linux/mempolicy.h>
|
|
#include <linux/migrate_mode.h>
|
|
#include <linux/hugetlb.h>
|
|
|
|
typedef struct page *new_page_t(struct page *page, unsigned long private);
|
|
typedef void free_page_t(struct page *page, unsigned long private);
|
|
|
|
struct migration_target_control;
|
|
|
|
/*
|
|
* Return values from addresss_space_operations.migratepage():
|
|
* - negative errno on page migration failure;
|
|
* - zero on page migration success;
|
|
*/
|
|
#define MIGRATEPAGE_SUCCESS 0
|
|
#define MIGRATEPAGE_UNMAP 1
|
|
|
|
/**
|
|
* struct movable_operations - Driver page migration
|
|
* @isolate_page:
|
|
* The VM calls this function to prepare the page to be moved. The page
|
|
* is locked and the driver should not unlock it. The driver should
|
|
* return ``true`` if the page is movable and ``false`` if it is not
|
|
* currently movable. After this function returns, the VM uses the
|
|
* page->lru field, so the driver must preserve any information which
|
|
* is usually stored here.
|
|
*
|
|
* @migrate_page:
|
|
* After isolation, the VM calls this function with the isolated
|
|
* @src page. The driver should copy the contents of the
|
|
* @src page to the @dst page and set up the fields of @dst page.
|
|
* Both pages are locked.
|
|
* If page migration is successful, the driver should call
|
|
* __ClearPageMovable(@src) and return MIGRATEPAGE_SUCCESS.
|
|
* If the driver cannot migrate the page at the moment, it can return
|
|
* -EAGAIN. The VM interprets this as a temporary migration failure and
|
|
* will retry it later. Any other error value is a permanent migration
|
|
* failure and migration will not be retried.
|
|
* The driver shouldn't touch the @src->lru field while in the
|
|
* migrate_page() function. It may write to @dst->lru.
|
|
*
|
|
* @putback_page:
|
|
* If migration fails on the isolated page, the VM informs the driver
|
|
* that the page is no longer a candidate for migration by calling
|
|
* this function. The driver should put the isolated page back into
|
|
* its own data structure.
|
|
*/
|
|
struct movable_operations {
|
|
bool (*isolate_page)(struct page *, isolate_mode_t);
|
|
int (*migrate_page)(struct page *dst, struct page *src,
|
|
enum migrate_mode);
|
|
void (*putback_page)(struct page *);
|
|
};
|
|
|
|
/* Defined in mm/debug.c: */
|
|
extern const char *migrate_reason_names[MR_TYPES];
|
|
|
|
#ifdef CONFIG_MIGRATION
|
|
|
|
void putback_movable_pages(struct list_head *l);
|
|
int migrate_folio_extra(struct address_space *mapping, struct folio *dst,
|
|
struct folio *src, enum migrate_mode mode, int extra_count);
|
|
int migrate_folio(struct address_space *mapping, struct folio *dst,
|
|
struct folio *src, enum migrate_mode mode);
|
|
int migrate_pages(struct list_head *l, new_page_t new, free_page_t free,
|
|
unsigned long private, enum migrate_mode mode, int reason,
|
|
unsigned int *ret_succeeded);
|
|
struct page *alloc_migration_target(struct page *page, unsigned long private);
|
|
bool isolate_movable_page(struct page *page, isolate_mode_t mode);
|
|
|
|
int migrate_huge_page_move_mapping(struct address_space *mapping,
|
|
struct folio *dst, struct folio *src);
|
|
void migration_entry_wait_on_locked(swp_entry_t entry, pte_t *ptep,
|
|
spinlock_t *ptl);
|
|
void folio_migrate_flags(struct folio *newfolio, struct folio *folio);
|
|
void folio_migrate_copy(struct folio *newfolio, struct folio *folio);
|
|
int folio_migrate_mapping(struct address_space *mapping,
|
|
struct folio *newfolio, struct folio *folio, int extra_count);
|
|
|
|
#else
|
|
|
|
static inline void putback_movable_pages(struct list_head *l) {}
|
|
static inline int migrate_pages(struct list_head *l, new_page_t new,
|
|
free_page_t free, unsigned long private, enum migrate_mode mode,
|
|
int reason, unsigned int *ret_succeeded)
|
|
{ return -ENOSYS; }
|
|
static inline struct page *alloc_migration_target(struct page *page,
|
|
unsigned long private)
|
|
{ return NULL; }
|
|
static inline bool isolate_movable_page(struct page *page, isolate_mode_t mode)
|
|
{ return false; }
|
|
|
|
static inline int migrate_huge_page_move_mapping(struct address_space *mapping,
|
|
struct folio *dst, struct folio *src)
|
|
{
|
|
return -ENOSYS;
|
|
}
|
|
|
|
#endif /* CONFIG_MIGRATION */
|
|
|
|
#ifdef CONFIG_COMPACTION
|
|
bool PageMovable(struct page *page);
|
|
void __SetPageMovable(struct page *page, const struct movable_operations *ops);
|
|
void __ClearPageMovable(struct page *page);
|
|
#else
|
|
static inline bool PageMovable(struct page *page) { return false; }
|
|
static inline void __SetPageMovable(struct page *page,
|
|
const struct movable_operations *ops)
|
|
{
|
|
}
|
|
static inline void __ClearPageMovable(struct page *page)
|
|
{
|
|
}
|
|
#endif
|
|
|
|
static inline bool folio_test_movable(struct folio *folio)
|
|
{
|
|
return PageMovable(&folio->page);
|
|
}
|
|
|
|
static inline
|
|
const struct movable_operations *folio_movable_ops(struct folio *folio)
|
|
{
|
|
VM_BUG_ON(!__folio_test_movable(folio));
|
|
|
|
return (const struct movable_operations *)
|
|
((unsigned long)folio->mapping - PAGE_MAPPING_MOVABLE);
|
|
}
|
|
|
|
static inline
|
|
const struct movable_operations *page_movable_ops(struct page *page)
|
|
{
|
|
VM_BUG_ON(!__PageMovable(page));
|
|
|
|
return (const struct movable_operations *)
|
|
((unsigned long)page->mapping - PAGE_MAPPING_MOVABLE);
|
|
}
|
|
|
|
#ifdef CONFIG_NUMA_BALANCING
|
|
int migrate_misplaced_page(struct page *page, struct vm_area_struct *vma,
|
|
int node);
|
|
#else
|
|
static inline int migrate_misplaced_page(struct page *page,
|
|
struct vm_area_struct *vma, int node)
|
|
{
|
|
return -EAGAIN; /* can't migrate now */
|
|
}
|
|
#endif /* CONFIG_NUMA_BALANCING */
|
|
|
|
#ifdef CONFIG_MIGRATION
|
|
|
|
/*
|
|
* Watch out for PAE architecture, which has an unsigned long, and might not
|
|
* have enough bits to store all physical address and flags. So far we have
|
|
* enough room for all our flags.
|
|
*/
|
|
#define MIGRATE_PFN_VALID (1UL << 0)
|
|
#define MIGRATE_PFN_MIGRATE (1UL << 1)
|
|
#define MIGRATE_PFN_WRITE (1UL << 3)
|
|
#define MIGRATE_PFN_SHIFT 6
|
|
|
|
static inline struct page *migrate_pfn_to_page(unsigned long mpfn)
|
|
{
|
|
if (!(mpfn & MIGRATE_PFN_VALID))
|
|
return NULL;
|
|
return pfn_to_page(mpfn >> MIGRATE_PFN_SHIFT);
|
|
}
|
|
|
|
static inline unsigned long migrate_pfn(unsigned long pfn)
|
|
{
|
|
return (pfn << MIGRATE_PFN_SHIFT) | MIGRATE_PFN_VALID;
|
|
}
|
|
|
|
enum migrate_vma_direction {
|
|
MIGRATE_VMA_SELECT_SYSTEM = 1 << 0,
|
|
MIGRATE_VMA_SELECT_DEVICE_PRIVATE = 1 << 1,
|
|
MIGRATE_VMA_SELECT_DEVICE_COHERENT = 1 << 2,
|
|
};
|
|
|
|
struct migrate_vma {
|
|
struct vm_area_struct *vma;
|
|
/*
|
|
* Both src and dst array must be big enough for
|
|
* (end - start) >> PAGE_SHIFT entries.
|
|
*
|
|
* The src array must not be modified by the caller after
|
|
* migrate_vma_setup(), and must not change the dst array after
|
|
* migrate_vma_pages() returns.
|
|
*/
|
|
unsigned long *dst;
|
|
unsigned long *src;
|
|
unsigned long cpages;
|
|
unsigned long npages;
|
|
unsigned long start;
|
|
unsigned long end;
|
|
|
|
/*
|
|
* Set to the owner value also stored in page->pgmap->owner for
|
|
* migrating out of device private memory. The flags also need to
|
|
* be set to MIGRATE_VMA_SELECT_DEVICE_PRIVATE.
|
|
* The caller should always set this field when using mmu notifier
|
|
* callbacks to avoid device MMU invalidations for device private
|
|
* pages that are not being migrated.
|
|
*/
|
|
void *pgmap_owner;
|
|
unsigned long flags;
|
|
|
|
/*
|
|
* Set to vmf->page if this is being called to migrate a page as part of
|
|
* a migrate_to_ram() callback.
|
|
*/
|
|
struct page *fault_page;
|
|
};
|
|
|
|
int migrate_vma_setup(struct migrate_vma *args);
|
|
void migrate_vma_pages(struct migrate_vma *migrate);
|
|
void migrate_vma_finalize(struct migrate_vma *migrate);
|
|
int migrate_device_range(unsigned long *src_pfns, unsigned long start,
|
|
unsigned long npages);
|
|
void migrate_device_pages(unsigned long *src_pfns, unsigned long *dst_pfns,
|
|
unsigned long npages);
|
|
void migrate_device_finalize(unsigned long *src_pfns,
|
|
unsigned long *dst_pfns, unsigned long npages);
|
|
|
|
#endif /* CONFIG_MIGRATION */
|
|
|
|
#endif /* _LINUX_MIGRATE_H */
|