1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef _LINUX_HIGHMEM_INTERNAL_H
3 #define _LINUX_HIGHMEM_INTERNAL_H
6 * Outside of CONFIG_HIGHMEM to support X86 32bit iomap_atomic() cruft.
8 #ifdef CONFIG_KMAP_LOCAL
9 void *__kmap_local_pfn_prot(unsigned long pfn, pgprot_t prot);
10 void *__kmap_local_page_prot(struct page *page, pgprot_t prot);
11 void kunmap_local_indexed(void *vaddr);
12 void kmap_local_fork(struct task_struct *tsk);
13 void __kmap_local_sched_out(void);
14 void __kmap_local_sched_in(void);
15 static inline void kmap_assert_nomap(void)
17 DEBUG_LOCKS_WARN_ON(current->kmap_ctrl.idx);
20 static inline void kmap_local_fork(struct task_struct *tsk) { }
21 static inline void kmap_assert_nomap(void) { }
25 #include <asm/highmem.h>
27 #ifndef ARCH_HAS_KMAP_FLUSH_TLB
28 static inline void kmap_flush_tlb(unsigned long addr) { }
32 #define kmap_prot PAGE_KERNEL
35 void *kmap_high(struct page *page);
36 void kunmap_high(struct page *page);
37 void __kmap_flush_unused(void);
38 struct page *__kmap_to_page(void *addr);
40 static inline void *kmap(struct page *page)
45 if (!PageHighMem(page))
46 addr = page_address(page);
48 addr = kmap_high(page);
49 kmap_flush_tlb((unsigned long)addr);
53 static inline void kunmap(struct page *page)
56 if (!PageHighMem(page))
61 static inline struct page *kmap_to_page(void *addr)
63 return __kmap_to_page(addr);
66 static inline void kmap_flush_unused(void)
68 __kmap_flush_unused();
71 static inline void *kmap_local_page(struct page *page)
73 return __kmap_local_page_prot(page, kmap_prot);
76 static inline void *kmap_local_page_prot(struct page *page, pgprot_t prot)
78 return __kmap_local_page_prot(page, prot);
81 static inline void *kmap_local_pfn(unsigned long pfn)
83 return __kmap_local_pfn_prot(pfn, kmap_prot);
86 static inline void __kunmap_local(void *vaddr)
88 kunmap_local_indexed(vaddr);
91 static inline void *kmap_atomic_prot(struct page *page, pgprot_t prot)
93 if (IS_ENABLED(CONFIG_PREEMPT_RT))
99 return __kmap_local_page_prot(page, prot);
102 static inline void *kmap_atomic(struct page *page)
104 return kmap_atomic_prot(page, kmap_prot);
107 static inline void *kmap_atomic_pfn(unsigned long pfn)
109 if (IS_ENABLED(CONFIG_PREEMPT_RT))
115 return __kmap_local_pfn_prot(pfn, kmap_prot);
118 static inline void __kunmap_atomic(void *addr)
120 kunmap_local_indexed(addr);
122 if (IS_ENABLED(CONFIG_PREEMPT_RT))
128 unsigned int __nr_free_highpages(void);
129 extern atomic_long_t _totalhigh_pages;
131 static inline unsigned int nr_free_highpages(void)
133 return __nr_free_highpages();
136 static inline unsigned long totalhigh_pages(void)
138 return (unsigned long)atomic_long_read(&_totalhigh_pages);
141 static inline void totalhigh_pages_add(long count)
143 atomic_long_add(count, &_totalhigh_pages);
146 #else /* CONFIG_HIGHMEM */
148 static inline struct page *kmap_to_page(void *addr)
150 return virt_to_page(addr);
153 static inline void *kmap(struct page *page)
156 return page_address(page);
159 static inline void kunmap_high(struct page *page) { }
160 static inline void kmap_flush_unused(void) { }
162 static inline void kunmap(struct page *page)
164 #ifdef ARCH_HAS_FLUSH_ON_KUNMAP
165 kunmap_flush_on_unmap(page_address(page));
169 static inline void *kmap_local_page(struct page *page)
171 return page_address(page);
174 static inline void *kmap_local_page_prot(struct page *page, pgprot_t prot)
176 return kmap_local_page(page);
179 static inline void *kmap_local_pfn(unsigned long pfn)
181 return kmap_local_page(pfn_to_page(pfn));
184 static inline void __kunmap_local(void *addr)
186 #ifdef ARCH_HAS_FLUSH_ON_KUNMAP
187 kunmap_flush_on_unmap(addr);
191 static inline void *kmap_atomic(struct page *page)
193 if (IS_ENABLED(CONFIG_PREEMPT_RT))
198 return page_address(page);
201 static inline void *kmap_atomic_prot(struct page *page, pgprot_t prot)
203 return kmap_atomic(page);
206 static inline void *kmap_atomic_pfn(unsigned long pfn)
208 return kmap_atomic(pfn_to_page(pfn));
211 static inline void __kunmap_atomic(void *addr)
213 #ifdef ARCH_HAS_FLUSH_ON_KUNMAP
214 kunmap_flush_on_unmap(addr);
217 if (IS_ENABLED(CONFIG_PREEMPT_RT))
223 static inline unsigned int nr_free_highpages(void) { return 0; }
224 static inline unsigned long totalhigh_pages(void) { return 0UL; }
226 #endif /* CONFIG_HIGHMEM */
229 * Prevent people trying to call kunmap_atomic() as if it were kunmap()
230 * kunmap_atomic() should get the return value of kmap_atomic, not the page.
232 #define kunmap_atomic(__addr) \
234 BUILD_BUG_ON(__same_type((__addr), struct page *)); \
235 __kunmap_atomic(__addr); \
238 #define kunmap_local(__addr) \
240 BUILD_BUG_ON(__same_type((__addr), struct page *)); \
241 __kunmap_local(__addr); \