linux/include/linux/pfn_t.h

/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _LINUX_PFN_T_H_
#define _LINUX_PFN_T_H_
#include <linux/mm.h>

/*
 * PFN_FLAGS_MASK - mask of all the possible valid pfn_t flags
 * PFN_SG_CHAIN - pfn is a pointer to the next scatterlist entry
 * PFN_SG_LAST - pfn references a page and is the last scatterlist entry
 * PFN_DEV - pfn is not covered by system memmap by default
 * PFN_MAP - pfn has a dynamic page mapping established by a device driver
 * PFN_SPECIAL - for CONFIG_FS_DAX_LIMITED builds to allow XIP, but not
 *		 get_user_pages
 */
#define PFN_FLAGS_MASK …
#define PFN_SG_CHAIN …
#define PFN_SG_LAST …
#define PFN_DEV …
#define PFN_MAP …
#define PFN_SPECIAL …

#define PFN_FLAGS_TRACE …

static inline pfn_t __pfn_to_pfn_t(unsigned long pfn, u64 flags)
{ … }

/* a default pfn to pfn_t conversion assumes that @pfn is pfn_valid() */
static inline pfn_t pfn_to_pfn_t(unsigned long pfn)
{ … }

static inline pfn_t phys_to_pfn_t(phys_addr_t addr, u64 flags)
{ … }

static inline bool pfn_t_has_page(pfn_t pfn)
{ … }

static inline unsigned long pfn_t_to_pfn(pfn_t pfn)
{ … }

static inline struct page *pfn_t_to_page(pfn_t pfn)
{ … }

static inline phys_addr_t pfn_t_to_phys(pfn_t pfn)
{ … }

static inline pfn_t page_to_pfn_t(struct page *page)
{ … }

static inline int pfn_t_valid(pfn_t pfn)
{ … }

#ifdef CONFIG_MMU
static inline pte_t pfn_t_pte(pfn_t pfn, pgprot_t pgprot)
{ … }
#endif

#ifdef CONFIG_TRANSPARENT_HUGEPAGE
static inline pmd_t pfn_t_pmd(pfn_t pfn, pgprot_t pgprot)
{ … }

#ifdef CONFIG_HAVE_ARCH_TRANSPARENT_HUGEPAGE_PUD
static inline pud_t pfn_t_pud(pfn_t pfn, pgprot_t pgprot)
{ … }
#endif
#endif

#ifdef CONFIG_ARCH_HAS_PTE_DEVMAP
static inline bool pfn_t_devmap(pfn_t pfn)
{ … }
#else
static inline bool pfn_t_devmap(pfn_t pfn)
{
	return false;
}
pte_t pte_mkdevmap(pte_t pte);
pmd_t pmd_mkdevmap(pmd_t pmd);
#if defined(CONFIG_TRANSPARENT_HUGEPAGE) && \
	defined(CONFIG_HAVE_ARCH_TRANSPARENT_HUGEPAGE_PUD)
pud_t pud_mkdevmap(pud_t pud);
#endif
#endif /* CONFIG_ARCH_HAS_PTE_DEVMAP */

#ifdef CONFIG_ARCH_HAS_PTE_SPECIAL
static inline bool pfn_t_special(pfn_t pfn)
{ … }
#else
static inline bool pfn_t_special(pfn_t pfn)
{
	return false;
}
#endif /* CONFIG_ARCH_HAS_PTE_SPECIAL */
#endif /* _LINUX_PFN_T_H_ */