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(const 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_folio(struct folio
*folio
, size_t offset
)
78 struct page
*page
= folio_page(folio
, offset
/ PAGE_SIZE
);
79 return __kmap_local_page_prot(page
, kmap_prot
) + offset
% PAGE_SIZE
;
82 static inline void *kmap_local_page_prot(struct page
*page
, pgprot_t prot
)
84 return __kmap_local_page_prot(page
, prot
);
87 static inline void *kmap_local_pfn(unsigned long pfn
)
89 return __kmap_local_pfn_prot(pfn
, kmap_prot
);
92 static inline void __kunmap_local(const void *vaddr
)
94 kunmap_local_indexed(vaddr
);
97 static inline void *kmap_atomic_prot(struct page
*page
, pgprot_t prot
)
99 if (IS_ENABLED(CONFIG_PREEMPT_RT
))
105 return __kmap_local_page_prot(page
, prot
);
108 static inline void *kmap_atomic(struct page
*page
)
110 return kmap_atomic_prot(page
, kmap_prot
);
113 static inline void *kmap_atomic_pfn(unsigned long pfn
)
115 if (IS_ENABLED(CONFIG_PREEMPT_RT
))
121 return __kmap_local_pfn_prot(pfn
, kmap_prot
);
124 static inline void __kunmap_atomic(const void *addr
)
126 kunmap_local_indexed(addr
);
128 if (IS_ENABLED(CONFIG_PREEMPT_RT
))
134 unsigned long __nr_free_highpages(void);
135 unsigned long __totalhigh_pages(void);
137 static inline unsigned long nr_free_highpages(void)
139 return __nr_free_highpages();
142 static inline unsigned long totalhigh_pages(void)
144 return __totalhigh_pages();
147 static inline bool is_kmap_addr(const void *x
)
149 unsigned long addr
= (unsigned long)x
;
151 return (addr
>= PKMAP_ADDR(0) && addr
< PKMAP_ADDR(LAST_PKMAP
)) ||
152 (addr
>= __fix_to_virt(FIX_KMAP_END
) &&
153 addr
< __fix_to_virt(FIX_KMAP_BEGIN
));
155 #else /* CONFIG_HIGHMEM */
157 static inline struct page
*kmap_to_page(void *addr
)
159 return virt_to_page(addr
);
162 static inline void *kmap(struct page
*page
)
165 return page_address(page
);
168 static inline void kunmap_high(struct page
*page
) { }
169 static inline void kmap_flush_unused(void) { }
171 static inline void kunmap(struct page
*page
)
173 #ifdef ARCH_HAS_FLUSH_ON_KUNMAP
174 kunmap_flush_on_unmap(page_address(page
));
178 static inline void *kmap_local_page(struct page
*page
)
180 return page_address(page
);
183 static inline void *kmap_local_folio(struct folio
*folio
, size_t offset
)
185 return page_address(&folio
->page
) + offset
;
188 static inline void *kmap_local_page_prot(struct page
*page
, pgprot_t prot
)
190 return kmap_local_page(page
);
193 static inline void *kmap_local_pfn(unsigned long pfn
)
195 return kmap_local_page(pfn_to_page(pfn
));
198 static inline void __kunmap_local(const void *addr
)
200 #ifdef ARCH_HAS_FLUSH_ON_KUNMAP
201 kunmap_flush_on_unmap(PTR_ALIGN_DOWN(addr
, PAGE_SIZE
));
205 static inline void *kmap_atomic(struct page
*page
)
207 if (IS_ENABLED(CONFIG_PREEMPT_RT
))
212 return page_address(page
);
215 static inline void *kmap_atomic_prot(struct page
*page
, pgprot_t prot
)
217 return kmap_atomic(page
);
220 static inline void *kmap_atomic_pfn(unsigned long pfn
)
222 return kmap_atomic(pfn_to_page(pfn
));
225 static inline void __kunmap_atomic(const void *addr
)
227 #ifdef ARCH_HAS_FLUSH_ON_KUNMAP
228 kunmap_flush_on_unmap(PTR_ALIGN_DOWN(addr
, PAGE_SIZE
));
231 if (IS_ENABLED(CONFIG_PREEMPT_RT
))
237 static inline unsigned long nr_free_highpages(void) { return 0; }
238 static inline unsigned long totalhigh_pages(void) { return 0; }
240 static inline bool is_kmap_addr(const void *x
)
245 #endif /* CONFIG_HIGHMEM */
248 * kunmap_atomic - Unmap the virtual address mapped by kmap_atomic() - deprecated!
249 * @__addr: Virtual address to be unmapped
251 * Unmaps an address previously mapped by kmap_atomic() and re-enables
252 * pagefaults. Depending on PREEMP_RT configuration, re-enables also
253 * migration and preemption. Users should not count on these side effects.
255 * Mappings should be unmapped in the reverse order that they were mapped.
256 * See kmap_local_page() for details on nesting.
258 * @__addr can be any address within the mapped page, so there is no need
259 * to subtract any offset that has been added. In contrast to kunmap(),
260 * this function takes the address returned from kmap_atomic(), not the
261 * page passed to it. The compiler will warn you if you pass the page.
263 #define kunmap_atomic(__addr) \
265 BUILD_BUG_ON(__same_type((__addr), struct page *)); \
266 __kunmap_atomic(__addr); \
270 * kunmap_local - Unmap a page mapped via kmap_local_page().
271 * @__addr: An address within the page mapped
273 * @__addr can be any address within the mapped page. Commonly it is the
274 * address return from kmap_local_page(), but it can also include offsets.
276 * Unmapping should be done in the reverse order of the mapping. See
277 * kmap_local_page() for details.
279 #define kunmap_local(__addr) \
281 BUILD_BUG_ON(__same_type((__addr), struct page *)); \
282 __kunmap_local(__addr); \