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Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158159160161162163164165166167168169170171172173174175176177178179180181182183184185186187188189190191192193194195196197198199200201202203204205206207208209210211212213214215216217218219220221222223224225226227228229230231232233234235236237238239240241242243244245246247248249250251252253254255256257258259260261262263264265266267268269270271272273274275276277278279280281282283284285286287288289290291292293294295296297298299/* SPDX-License-Identifier: GPL-2.0 */#ifndef _LINUX_HIGHMEM_INTERNAL_H#define _LINUX_HIGHMEM_INTERNAL_H
/* * Outside of CONFIG_HIGHMEM to support X86 32bit iomap_atomic() cruft. */#ifdef CONFIG_KMAP_LOCALvoid *__kmap_local_pfn_prot(unsigned long pfn, pgprot_t prot);void *__kmap_local_page_prot(const struct page *page, pgprot_t prot);void kunmap_local_indexed(const void *vaddr);void kmap_local_fork(struct task_struct *tsk);void __kmap_local_sched_out(void);void __kmap_local_sched_in(void);static inline void kmap_assert_nomap(void){ DEBUG_LOCKS_WARN_ON(current->kmap_ctrl.idx);}#elsestatic inline void kmap_local_fork(struct task_struct *tsk) { }static inline void kmap_assert_nomap(void) { }#endif
#ifdef CONFIG_HIGHMEM#include <asm/highmem.h>
#ifndef ARCH_HAS_KMAP_FLUSH_TLBstatic inline void kmap_flush_tlb(unsigned long addr) { }#endif
#ifndef kmap_prot#define kmap_prot PAGE_KERNEL#endif
void *kmap_high(struct page *page);void kunmap_high(const struct page *page);void __kmap_flush_unused(void);struct page *__kmap_to_page(void *addr);
static inline void *kmap(struct page *page){ void *addr;
might_sleep(); if (!PageHighMem(page)) addr = page_address(page); else addr = kmap_high(page); kmap_flush_tlb((unsigned long)addr); return addr;}
static inline void kunmap(const struct page *page){ might_sleep(); if (!PageHighMem(page)) return; kunmap_high(page);}
static inline struct page *kmap_to_page(void *addr){ return __kmap_to_page(addr);}
static inline void kmap_flush_unused(void){ __kmap_flush_unused();}
static inline void *kmap_local_page(const struct page *page){ return __kmap_local_page_prot(page, kmap_prot);}
static inline void *kmap_local_page_try_from_panic(const struct page *page){ if (!PageHighMem(page)) return page_address(page); /* If the page is in HighMem, it's not safe to kmap it.*/ return NULL;}
static inline void *kmap_local_folio(const struct folio *folio, size_t offset){ const struct page *page = folio_page(folio, offset / PAGE_SIZE); return __kmap_local_page_prot(page, kmap_prot) + offset % PAGE_SIZE;}
static inline void *kmap_local_page_prot(const struct page *page, pgprot_t prot){ return __kmap_local_page_prot(page, prot);}
static inline void *kmap_local_pfn(unsigned long pfn){ return __kmap_local_pfn_prot(pfn, kmap_prot);}
static inline void __kunmap_local(const void *vaddr){ kunmap_local_indexed(vaddr);}
static inline void *kmap_atomic_prot(const struct page *page, pgprot_t prot){ if (IS_ENABLED(CONFIG_PREEMPT_RT)) migrate_disable(); else preempt_disable();
pagefault_disable(); return __kmap_local_page_prot(page, prot);}
static inline void *kmap_atomic(const struct page *page){ return kmap_atomic_prot(page, kmap_prot);}
static inline void *kmap_atomic_pfn(unsigned long pfn){ if (IS_ENABLED(CONFIG_PREEMPT_RT)) migrate_disable(); else preempt_disable();
pagefault_disable(); return __kmap_local_pfn_prot(pfn, kmap_prot);}
static inline void __kunmap_atomic(const void *addr){ kunmap_local_indexed(addr); pagefault_enable(); if (IS_ENABLED(CONFIG_PREEMPT_RT)) migrate_enable(); else preempt_enable();}
unsigned long __nr_free_highpages(void);unsigned long __totalhigh_pages(void);
static inline unsigned long nr_free_highpages(void){ return __nr_free_highpages();}
static inline unsigned long totalhigh_pages(void){ return __totalhigh_pages();}
static inline bool is_kmap_addr(const void *x){ unsigned long addr = (unsigned long)x;
return (addr >= PKMAP_ADDR(0) && addr < PKMAP_ADDR(LAST_PKMAP)) || (addr >= __fix_to_virt(FIX_KMAP_END) && addr < __fix_to_virt(FIX_KMAP_BEGIN));}#else /* CONFIG_HIGHMEM */
static inline struct page *kmap_to_page(void *addr){ return virt_to_page(addr);}
static inline void *kmap(struct page *page){ might_sleep(); return page_address(page);}
static inline void kunmap_high(const struct page *page) { }static inline void kmap_flush_unused(void) { }
static inline void kunmap(const struct page *page){#ifdef ARCH_HAS_FLUSH_ON_KUNMAP kunmap_flush_on_unmap(page_address(page));#endif}
static inline void *kmap_local_page(const struct page *page){ return page_address(page);}
static inline void *kmap_local_page_try_from_panic(const struct page *page){ return page_address(page);}
static inline void *kmap_local_folio(const struct folio *folio, size_t offset){ return folio_address(folio) + offset;}
static inline void *kmap_local_page_prot(const struct page *page, pgprot_t prot){ return kmap_local_page(page);}
static inline void *kmap_local_pfn(unsigned long pfn){ return kmap_local_page(pfn_to_page(pfn));}
static inline void __kunmap_local(const void *addr){#ifdef ARCH_HAS_FLUSH_ON_KUNMAP kunmap_flush_on_unmap(PTR_ALIGN_DOWN(addr, PAGE_SIZE));#endif}
static inline void *kmap_atomic(const struct page *page){ if (IS_ENABLED(CONFIG_PREEMPT_RT)) migrate_disable(); else preempt_disable(); pagefault_disable(); return page_address(page);}
static inline void *kmap_atomic_prot(const struct page *page, pgprot_t prot){ return kmap_atomic(page);}
static inline void *kmap_atomic_pfn(unsigned long pfn){ return kmap_atomic(pfn_to_page(pfn));}
static inline void __kunmap_atomic(const void *addr){#ifdef ARCH_HAS_FLUSH_ON_KUNMAP kunmap_flush_on_unmap(PTR_ALIGN_DOWN(addr, PAGE_SIZE));#endif pagefault_enable(); if (IS_ENABLED(CONFIG_PREEMPT_RT)) migrate_enable(); else preempt_enable();}
static inline unsigned long nr_free_highpages(void) { return 0; }static inline unsigned long totalhigh_pages(void) { return 0; }
static inline bool is_kmap_addr(const void *x){ return false;}
#endif /* CONFIG_HIGHMEM */
/** * kunmap_atomic - Unmap the virtual address mapped by kmap_atomic() - deprecated! * @__addr: Virtual address to be unmapped * * Unmaps an address previously mapped by kmap_atomic() and re-enables * pagefaults. Depending on PREEMPT_RT configuration, re-enables also * migration and preemption. Users should not count on these side effects. * * Mappings should be unmapped in the reverse order that they were mapped. * See kmap_local_page() for details on nesting. * * @__addr can be any address within the mapped page, so there is no need * to subtract any offset that has been added. In contrast to kunmap(), * this function takes the address returned from kmap_atomic(), not the * page passed to it. The compiler will warn you if you pass the page. */#define kunmap_atomic(__addr) \do { \ BUILD_BUG_ON(__same_type((__addr), struct page *)); \ __kunmap_atomic(__addr); \} while (0)
/** * kunmap_local - Unmap a page mapped via kmap_local_page(). * @__addr: An address within the page mapped * * @__addr can be any address within the mapped page. Commonly it is the * address return from kmap_local_page(), but it can also include offsets. * * Unmapping should be done in the reverse order of the mapping. See * kmap_local_page() for details. */#define kunmap_local(__addr) \do { \ BUILD_BUG_ON(__same_type((__addr), struct page *)); \ __kunmap_local(__addr); \} while (0)
#endif