mm: introduce Data Access MONitor (DAMON)

[linux-2.6-microblaze.git] / include / linux / swapops.h

diff --git a/include/linux/swapops.h b/include/linux/swapops.h
index 6430a94..d356ab4 100644 (file)
--- a/include/linux/swapops.h
+++ b/include/linux/swapops.h
@@ -107,10 +107,14 @@ static inline void *swp_to_radix_entry(swp_entry_t entry)
 }
 
 #if IS_ENABLED(CONFIG_DEVICE_PRIVATE)
-static inline swp_entry_t make_device_private_entry(struct page *page, bool write)
+static inline swp_entry_t make_readable_device_private_entry(pgoff_t offset)
 {
-       return swp_entry(write ? SWP_DEVICE_WRITE : SWP_DEVICE_READ,
-                        page_to_pfn(page));
+       return swp_entry(SWP_DEVICE_READ, offset);
+}
+
+static inline swp_entry_t make_writable_device_private_entry(pgoff_t offset)
+{
+       return swp_entry(SWP_DEVICE_WRITE, offset);
 }
 
 static inline bool is_device_private_entry(swp_entry_t entry)
@@ -119,33 +123,40 @@ static inline bool is_device_private_entry(swp_entry_t entry)
        return type == SWP_DEVICE_READ || type == SWP_DEVICE_WRITE;
 }
 
-static inline void make_device_private_entry_read(swp_entry_t *entry)
+static inline bool is_writable_device_private_entry(swp_entry_t entry)
 {
-       *entry = swp_entry(SWP_DEVICE_READ, swp_offset(*entry));
+       return unlikely(swp_type(entry) == SWP_DEVICE_WRITE);
 }
 
-static inline bool is_write_device_private_entry(swp_entry_t entry)
+static inline swp_entry_t make_readable_device_exclusive_entry(pgoff_t offset)
 {
-       return unlikely(swp_type(entry) == SWP_DEVICE_WRITE);
+       return swp_entry(SWP_DEVICE_EXCLUSIVE_READ, offset);
 }
 
-static inline unsigned long device_private_entry_to_pfn(swp_entry_t entry)
+static inline swp_entry_t make_writable_device_exclusive_entry(pgoff_t offset)
 {
-       return swp_offset(entry);
+       return swp_entry(SWP_DEVICE_EXCLUSIVE_WRITE, offset);
 }
 
-static inline struct page *device_private_entry_to_page(swp_entry_t entry)
+static inline bool is_device_exclusive_entry(swp_entry_t entry)
 {
-       return pfn_to_page(swp_offset(entry));
+       return swp_type(entry) == SWP_DEVICE_EXCLUSIVE_READ ||
+               swp_type(entry) == SWP_DEVICE_EXCLUSIVE_WRITE;
+}
+
+static inline bool is_writable_device_exclusive_entry(swp_entry_t entry)
+{
+       return unlikely(swp_type(entry) == SWP_DEVICE_EXCLUSIVE_WRITE);
 }
 #else /* CONFIG_DEVICE_PRIVATE */
-static inline swp_entry_t make_device_private_entry(struct page *page, bool write)
+static inline swp_entry_t make_readable_device_private_entry(pgoff_t offset)
 {
        return swp_entry(0, 0);
 }
 
-static inline void make_device_private_entry_read(swp_entry_t *entry)
+static inline swp_entry_t make_writable_device_private_entry(pgoff_t offset)
 {
+       return swp_entry(0, 0);
 }
 
 static inline bool is_device_private_entry(swp_entry_t entry)
@@ -153,61 +164,52 @@ 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)
+static inline bool is_writable_device_private_entry(swp_entry_t entry)
 {
        return false;
 }
 
-static inline unsigned long device_private_entry_to_pfn(swp_entry_t entry)
+static inline swp_entry_t make_readable_device_exclusive_entry(pgoff_t offset)
 {
-       return 0;
+       return swp_entry(0, 0);
 }
 
-static inline struct page *device_private_entry_to_page(swp_entry_t entry)
+static inline swp_entry_t make_writable_device_exclusive_entry(pgoff_t offset)
 {
-       return NULL;
+       return swp_entry(0, 0);
 }
-#endif /* CONFIG_DEVICE_PRIVATE */
 
-#ifdef CONFIG_MIGRATION
-static inline swp_entry_t make_migration_entry(struct page *page, int write)
+static inline bool is_device_exclusive_entry(swp_entry_t entry)
 {
-       BUG_ON(!PageLocked(compound_head(page)));
+       return false;
+}
 
-       return swp_entry(write ? SWP_MIGRATION_WRITE : SWP_MIGRATION_READ,
-                       page_to_pfn(page));
+static inline bool is_writable_device_exclusive_entry(swp_entry_t entry)
+{
+       return false;
 }
+#endif /* CONFIG_DEVICE_PRIVATE */
 
+#ifdef CONFIG_MIGRATION
 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)
+static inline int is_writable_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)
+static inline swp_entry_t make_readable_migration_entry(pgoff_t offset)
 {
-       return swp_offset(entry);
+       return swp_entry(SWP_MIGRATION_READ, offset);
 }
 
-static inline struct page *migration_entry_to_page(swp_entry_t entry)
+static inline swp_entry_t make_writable_migration_entry(pgoff_t offset)
 {
-       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));
+       return swp_entry(SWP_MIGRATION_WRITE, offset);
 }
 
 extern void __migration_entry_wait(struct mm_struct *mm, pte_t *ptep,
@@ -217,37 +219,58 @@ extern void migration_entry_wait(struct mm_struct *mm, pmd_t *pmd,
 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)
+static inline swp_entry_t make_readable_migration_entry(pgoff_t offset)
 {
-       return 0;
+       return swp_entry(0, 0);
 }
 
-static inline unsigned long migration_entry_to_pfn(swp_entry_t entry)
+static inline swp_entry_t make_writable_migration_entry(pgoff_t offset)
 {
-       return 0;
+       return swp_entry(0, 0);
 }
 
-static inline struct page *migration_entry_to_page(swp_entry_t entry)
+static inline int is_migration_entry(swp_entry_t swp)
 {
-       return NULL;
+       return 0;
 }
 
-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)
+static inline int is_writable_migration_entry(swp_entry_t entry)
 {
        return 0;
 }
 
 #endif
 
+static inline struct page *pfn_swap_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(is_migration_entry(entry) && !PageLocked(p));
+
+       return p;
+}
+
+/*
+ * A pfn swap entry is a special type of swap entry that always has a pfn stored
+ * in the swap offset. They are used to represent unaddressable device memory
+ * and to restrict access to a page undergoing migration.
+ */
+static inline bool is_pfn_swap_entry(swp_entry_t entry)
+{
+       return is_migration_entry(entry) || is_device_private_entry(entry) ||
+              is_device_exclusive_entry(entry);
+}
+
 struct page_vma_mapped_walk;
 
 #ifdef CONFIG_ARCH_ENABLE_THP_MIGRATION
@@ -265,6 +288,8 @@ static inline swp_entry_t pmd_to_swp_entry(pmd_t pmd)
 
        if (pmd_swp_soft_dirty(pmd))
                pmd = pmd_swp_clear_soft_dirty(pmd);
+       if (pmd_swp_uffd_wp(pmd))
+               pmd = pmd_swp_clear_uffd_wp(pmd);
        arch_entry = __pmd_to_swp_entry(pmd);
        return swp_entry(__swp_type(arch_entry), __swp_offset(arch_entry));
 }
@@ -330,6 +355,11 @@ static inline int is_hwpoison_entry(swp_entry_t entry)
        return swp_type(entry) == SWP_HWPOISON;
 }
 
+static inline unsigned long hwpoison_entry_to_pfn(swp_entry_t entry)
+{
+       return swp_offset(entry);
+}
+
 static inline void num_poisoned_pages_inc(void)
 {
        atomic_long_inc(&num_poisoned_pages);