diff options
Diffstat (limited to 'include')
-rw-r--r-- | include/linux/mmu_notifier.h | 6 | ||||
-rw-r--r-- | include/linux/rmap.h | 4 | ||||
-rw-r--r-- | include/linux/swap.h | 9 | ||||
-rw-r--r-- | include/linux/swapops.h | 44 |
4 files changed, 60 insertions, 3 deletions
diff --git a/include/linux/mmu_notifier.h b/include/linux/mmu_notifier.h index 8e428eb813b8..6692da8d121d 100644 --- a/include/linux/mmu_notifier.h +++ b/include/linux/mmu_notifier.h @@ -42,6 +42,11 @@ struct mmu_interval_notifier; * @MMU_NOTIFY_MIGRATE: used during migrate_vma_collect() invalidate to signal * a device driver to possibly ignore the invalidation if the * owner field matches the driver's device private pgmap owner. + * + * @MMU_NOTIFY_EXCLUSIVE: to signal a device driver that the device will no + * longer have exclusive access to the page. When sent during creation of an + * exclusive range the owner will be initialised to the value provided by the + * caller of make_device_exclusive_range(), otherwise the owner will be NULL. */ enum mmu_notifier_event { MMU_NOTIFY_UNMAP = 0, @@ -51,6 +56,7 @@ enum mmu_notifier_event { MMU_NOTIFY_SOFT_DIRTY, MMU_NOTIFY_RELEASE, MMU_NOTIFY_MIGRATE, + MMU_NOTIFY_EXCLUSIVE, }; #define MMU_NOTIFIER_RANGE_BLOCKABLE (1 << 0) diff --git a/include/linux/rmap.h b/include/linux/rmap.h index b0ea9d98302f..83fb86133fe1 100644 --- a/include/linux/rmap.h +++ b/include/linux/rmap.h @@ -194,6 +194,10 @@ int page_referenced(struct page *, int is_locked, void try_to_migrate(struct page *page, enum ttu_flags flags); void try_to_unmap(struct page *, enum ttu_flags flags); +int make_device_exclusive_range(struct mm_struct *mm, unsigned long start, + unsigned long end, struct page **pages, + void *arg); + /* Avoid racy checks */ #define PVMW_SYNC (1 << 0) /* Look for migarion entries rather than present PTEs */ diff --git a/include/linux/swap.h b/include/linux/swap.h index df7cbb6b3d3e..6f5a43251593 100644 --- a/include/linux/swap.h +++ b/include/linux/swap.h @@ -62,12 +62,17 @@ static inline int current_is_kswapd(void) * migrate part of a process memory to device memory. * * When a page is migrated from CPU to device, we set the CPU page table entry - * to a special SWP_DEVICE_* entry. + * to a special SWP_DEVICE_{READ|WRITE} entry. + * + * When a page is mapped by the device for exclusive access we set the CPU page + * table entries to special SWP_DEVICE_EXCLUSIVE_* entries. */ #ifdef CONFIG_DEVICE_PRIVATE -#define SWP_DEVICE_NUM 2 +#define SWP_DEVICE_NUM 4 #define SWP_DEVICE_WRITE (MAX_SWAPFILES+SWP_HWPOISON_NUM+SWP_MIGRATION_NUM) #define SWP_DEVICE_READ (MAX_SWAPFILES+SWP_HWPOISON_NUM+SWP_MIGRATION_NUM+1) +#define SWP_DEVICE_EXCLUSIVE_WRITE (MAX_SWAPFILES+SWP_HWPOISON_NUM+SWP_MIGRATION_NUM+2) +#define SWP_DEVICE_EXCLUSIVE_READ (MAX_SWAPFILES+SWP_HWPOISON_NUM+SWP_MIGRATION_NUM+3) #else #define SWP_DEVICE_NUM 0 #endif diff --git a/include/linux/swapops.h b/include/linux/swapops.h index 04d76357aa0c..d356ab4047f7 100644 --- a/include/linux/swapops.h +++ b/include/linux/swapops.h @@ -127,6 +127,27 @@ static inline bool is_writable_device_private_entry(swp_entry_t entry) { return unlikely(swp_type(entry) == SWP_DEVICE_WRITE); } + +static inline swp_entry_t make_readable_device_exclusive_entry(pgoff_t offset) +{ + return swp_entry(SWP_DEVICE_EXCLUSIVE_READ, offset); +} + +static inline swp_entry_t make_writable_device_exclusive_entry(pgoff_t offset) +{ + return swp_entry(SWP_DEVICE_EXCLUSIVE_WRITE, offset); +} + +static inline bool is_device_exclusive_entry(swp_entry_t 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_readable_device_private_entry(pgoff_t offset) { @@ -147,6 +168,26 @@ static inline bool is_writable_device_private_entry(swp_entry_t entry) { return false; } + +static inline swp_entry_t make_readable_device_exclusive_entry(pgoff_t offset) +{ + return swp_entry(0, 0); +} + +static inline swp_entry_t make_writable_device_exclusive_entry(pgoff_t offset) +{ + return swp_entry(0, 0); +} + +static inline bool is_device_exclusive_entry(swp_entry_t entry) +{ + return false; +} + +static inline bool is_writable_device_exclusive_entry(swp_entry_t entry) +{ + return false; +} #endif /* CONFIG_DEVICE_PRIVATE */ #ifdef CONFIG_MIGRATION @@ -226,7 +267,8 @@ static inline struct page *pfn_swap_entry_to_page(swp_entry_t entry) */ static inline bool is_pfn_swap_entry(swp_entry_t entry) { - return is_migration_entry(entry) || is_device_private_entry(entry); + return is_migration_entry(entry) || is_device_private_entry(entry) || + is_device_exclusive_entry(entry); } struct page_vma_mapped_walk; |