diff options
Diffstat (limited to 'include/linux/memremap.h')
| -rw-r--r-- | include/linux/memremap.h | 27 |
1 files changed, 24 insertions, 3 deletions
diff --git a/include/linux/memremap.h b/include/linux/memremap.h index 1fafcc38acba..8af304f6b504 100644 --- a/include/linux/memremap.h +++ b/include/linux/memremap.h @@ -1,6 +1,8 @@ /* SPDX-License-Identifier: GPL-2.0 */ #ifndef _LINUX_MEMREMAP_H_ #define _LINUX_MEMREMAP_H_ + +#include <linux/mm.h> #include <linux/range.h> #include <linux/ioport.h> #include <linux/percpu-refcount.h> @@ -66,9 +68,9 @@ enum memory_type { struct dev_pagemap_ops { /* - * Called once the page refcount reaches 1. (ZONE_DEVICE pages never - * reach 0 refcount unless there is a refcount bug. This allows the - * device driver to implement its own memory management.) + * Called once the page refcount reaches 0. The reference count will be + * reset to one by the core code after the method is called to prepare + * for handing out the page again. */ void (*page_free)(struct page *page); @@ -129,6 +131,25 @@ static inline unsigned long pgmap_vmemmap_nr(struct dev_pagemap *pgmap) return 1 << pgmap->vmemmap_shift; } +static inline bool is_device_private_page(const struct page *page) +{ + return IS_ENABLED(CONFIG_DEVICE_PRIVATE) && + is_zone_device_page(page) && + page->pgmap->type == MEMORY_DEVICE_PRIVATE; +} + +static inline bool folio_is_device_private(const struct folio *folio) +{ + return is_device_private_page(&folio->page); +} + +static inline bool is_pci_p2pdma_page(const struct page *page) +{ + return IS_ENABLED(CONFIG_PCI_P2PDMA) && + is_zone_device_page(page) && + page->pgmap->type == MEMORY_DEVICE_PCI_P2PDMA; +} + #ifdef CONFIG_ZONE_DEVICE void *memremap_pages(struct dev_pagemap *pgmap, int nid); void memunmap_pages(struct dev_pagemap *pgmap); |