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Linus Torvalds1da177e2005-04-16 15:20:36 -07001#ifndef _LINUX_HIGHMEM_H
2#define _LINUX_HIGHMEM_H
3
Linus Torvalds1da177e2005-04-16 15:20:36 -07004#include <linux/fs.h>
Cesar Eduardo Barros597781f2010-08-09 17:18:32 -07005#include <linux/kernel.h>
Paul Gortmaker187f1882011-11-23 20:12:59 -05006#include <linux/bug.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -07007#include <linux/mm.h>
Peter Zijlstraad76fb62006-12-06 20:32:21 -08008#include <linux/uaccess.h>
Catalin Marinas43b3a0c2010-11-11 14:05:10 -08009#include <linux/hardirq.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070010
11#include <asm/cacheflush.h>
12
James Bottomley03beb072006-03-26 01:36:57 -080013#ifndef ARCH_HAS_FLUSH_ANON_PAGE
Russell Kinga6f36be2006-12-30 22:24:19 +000014static inline void flush_anon_page(struct vm_area_struct *vma, struct page *page, unsigned long vmaddr)
James Bottomley03beb072006-03-26 01:36:57 -080015{
16}
17#endif
18
James Bottomley5a3a5a92006-03-26 01:36:59 -080019#ifndef ARCH_HAS_FLUSH_KERNEL_DCACHE_PAGE
20static inline void flush_kernel_dcache_page(struct page *page)
21{
22}
James Bottomley9df5f7412010-01-25 11:42:20 -060023static inline void flush_kernel_vmap_range(void *vaddr, int size)
24{
25}
26static inline void invalidate_kernel_vmap_range(void *vaddr, int size)
27{
28}
James Bottomley5a3a5a92006-03-26 01:36:59 -080029#endif
30
Kumar Gala3688e072009-04-01 23:38:49 -050031#include <asm/kmap_types.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070032
Kumar Gala3688e072009-04-01 23:38:49 -050033#ifdef CONFIG_HIGHMEM
Linus Torvalds1da177e2005-04-16 15:20:36 -070034#include <asm/highmem.h>
35
36/* declarations for linux/mm/highmem.c */
37unsigned int nr_free_highpages(void);
Christoph Lameterc1f60a52006-09-25 23:31:11 -070038extern unsigned long totalhigh_pages;
Linus Torvalds1da177e2005-04-16 15:20:36 -070039
Jeremy Fitzhardingece6234b2007-05-02 19:27:15 +020040void kmap_flush_unused(void);
41
Mel Gorman5a178112012-07-31 16:45:02 -070042struct page *kmap_to_page(void *addr);
43
Linus Torvalds1da177e2005-04-16 15:20:36 -070044#else /* CONFIG_HIGHMEM */
45
46static inline unsigned int nr_free_highpages(void) { return 0; }
47
Mel Gorman5a178112012-07-31 16:45:02 -070048static inline struct page *kmap_to_page(void *addr)
49{
50 return virt_to_page(addr);
51}
52
Andreas Fenkart4b529402010-01-08 14:42:31 -080053#define totalhigh_pages 0UL
Christoph Lameterc1f60a52006-09-25 23:31:11 -070054
James Bottomleya6ca1b92006-09-25 23:30:55 -070055#ifndef ARCH_HAS_KMAP
Linus Torvalds1da177e2005-04-16 15:20:36 -070056static inline void *kmap(struct page *page)
57{
58 might_sleep();
59 return page_address(page);
60}
61
Matthew Wilcox31c91132009-06-16 15:32:45 -070062static inline void kunmap(struct page *page)
63{
64}
Linus Torvalds1da177e2005-04-16 15:20:36 -070065
Cong Wanga24401b2011-11-26 10:53:39 +080066static inline void *kmap_atomic(struct page *page)
Geert Uytterhoeven254f9c52007-05-01 22:33:07 +020067{
68 pagefault_disable();
69 return page_address(page);
70}
Cong Wanga24401b2011-11-26 10:53:39 +080071#define kmap_atomic_prot(page, prot) kmap_atomic(page)
Geert Uytterhoeven254f9c52007-05-01 22:33:07 +020072
Peter Zijlstra3e4d3af2010-10-26 14:21:51 -070073static inline void __kunmap_atomic(void *addr)
Andi Kleen4e60c862010-08-09 17:19:03 -070074{
75 pagefault_enable();
76}
77
Peter Zijlstra3e4d3af2010-10-26 14:21:51 -070078#define kmap_atomic_pfn(pfn) kmap_atomic(pfn_to_page(pfn))
Linus Torvalds1da177e2005-04-16 15:20:36 -070079#define kmap_atomic_to_page(ptr) virt_to_page(ptr)
Jeremy Fitzhardingece6234b2007-05-02 19:27:15 +020080
81#define kmap_flush_unused() do {} while(0)
James Bottomleya6ca1b92006-09-25 23:30:55 -070082#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -070083
84#endif /* CONFIG_HIGHMEM */
85
Peter Zijlstraa8e23a22010-10-27 15:32:57 -070086#if defined(CONFIG_HIGHMEM) || defined(CONFIG_X86_32)
87
88DECLARE_PER_CPU(int, __kmap_atomic_idx);
89
90static inline int kmap_atomic_idx_push(void)
91{
Christoph Lametercfb82432010-12-06 11:40:03 -060092 int idx = __this_cpu_inc_return(__kmap_atomic_idx) - 1;
93
Peter Zijlstraa8e23a22010-10-27 15:32:57 -070094#ifdef CONFIG_DEBUG_HIGHMEM
95 WARN_ON_ONCE(in_irq() && !irqs_disabled());
96 BUG_ON(idx > KM_TYPE_NR);
97#endif
98 return idx;
99}
100
Peter Zijlstra20273942010-10-27 15:32:58 -0700101static inline int kmap_atomic_idx(void)
102{
Christoph Lametercfb82432010-12-06 11:40:03 -0600103 return __this_cpu_read(__kmap_atomic_idx) - 1;
Peter Zijlstra20273942010-10-27 15:32:58 -0700104}
105
Christoph Lametercfb82432010-12-06 11:40:03 -0600106static inline void kmap_atomic_idx_pop(void)
Peter Zijlstraa8e23a22010-10-27 15:32:57 -0700107{
Peter Zijlstraa8e23a22010-10-27 15:32:57 -0700108#ifdef CONFIG_DEBUG_HIGHMEM
Christoph Lametercfb82432010-12-06 11:40:03 -0600109 int idx = __this_cpu_dec_return(__kmap_atomic_idx);
110
Peter Zijlstraa8e23a22010-10-27 15:32:57 -0700111 BUG_ON(idx < 0);
Christoph Lametercfb82432010-12-06 11:40:03 -0600112#else
113 __this_cpu_dec(__kmap_atomic_idx);
Peter Zijlstraa8e23a22010-10-27 15:32:57 -0700114#endif
Peter Zijlstraa8e23a22010-10-27 15:32:57 -0700115}
116
117#endif
118
Peter Zijlstra3e4d3af2010-10-26 14:21:51 -0700119/*
Peter Zijlstra3e4d3af2010-10-26 14:21:51 -0700120 * Prevent people trying to call kunmap_atomic() as if it were kunmap()
121 * kunmap_atomic() should get the return value of kmap_atomic, not the page.
122 */
Cong Wang1285e4c2012-06-22 23:17:53 +0800123#define kunmap_atomic(addr) \
Cong Wang980c19e2011-11-25 22:08:45 +0800124do { \
125 BUILD_BUG_ON(__same_type((addr), struct page *)); \
126 __kunmap_atomic(addr); \
127} while (0)
128
Cong Wang980c19e2011-11-25 22:08:45 +0800129
Linus Torvalds1da177e2005-04-16 15:20:36 -0700130/* when CONFIG_HIGHMEM is not set these will be plain clear/copy_page */
Russell King487ff322008-11-27 11:13:58 +0000131#ifndef clear_user_highpage
Linus Torvalds1da177e2005-04-16 15:20:36 -0700132static inline void clear_user_highpage(struct page *page, unsigned long vaddr)
133{
Cong Wang1ec9c5d2011-11-25 23:14:14 +0800134 void *addr = kmap_atomic(page);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700135 clear_user_page(addr, vaddr, page);
Cong Wang1ec9c5d2011-11-25 23:14:14 +0800136 kunmap_atomic(addr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700137}
Russell King487ff322008-11-27 11:13:58 +0000138#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700139
140#ifndef __HAVE_ARCH_ALLOC_ZEROED_USER_HIGHPAGE
Mel Gorman769848c2007-07-17 04:03:05 -0700141/**
142 * __alloc_zeroed_user_highpage - Allocate a zeroed HIGHMEM page for a VMA with caller-specified movable GFP flags
143 * @movableflags: The GFP flags related to the pages future ability to move like __GFP_MOVABLE
144 * @vma: The VMA the page is to be allocated for
145 * @vaddr: The virtual address the page will be inserted into
146 *
147 * This function will allocate a page for a VMA but the caller is expected
148 * to specify via movableflags whether the page will be movable in the
149 * future or not
150 *
151 * An architecture may override this function by defining
152 * __HAVE_ARCH_ALLOC_ZEROED_USER_HIGHPAGE and providing their own
153 * implementation.
154 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700155static inline struct page *
Mel Gorman769848c2007-07-17 04:03:05 -0700156__alloc_zeroed_user_highpage(gfp_t movableflags,
157 struct vm_area_struct *vma,
158 unsigned long vaddr)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700159{
Mel Gorman769848c2007-07-17 04:03:05 -0700160 struct page *page = alloc_page_vma(GFP_HIGHUSER | movableflags,
161 vma, vaddr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700162
163 if (page)
164 clear_user_highpage(page, vaddr);
165
166 return page;
167}
168#endif
169
Mel Gorman769848c2007-07-17 04:03:05 -0700170/**
Mel Gorman769848c2007-07-17 04:03:05 -0700171 * alloc_zeroed_user_highpage_movable - Allocate a zeroed HIGHMEM page for a VMA that the caller knows can move
172 * @vma: The VMA the page is to be allocated for
173 * @vaddr: The virtual address the page will be inserted into
174 *
175 * This function will allocate a page for a VMA that the caller knows will
176 * be able to migrate in the future using move_pages() or reclaimed
177 */
178static inline struct page *
179alloc_zeroed_user_highpage_movable(struct vm_area_struct *vma,
180 unsigned long vaddr)
181{
182 return __alloc_zeroed_user_highpage(__GFP_MOVABLE, vma, vaddr);
183}
184
Linus Torvalds1da177e2005-04-16 15:20:36 -0700185static inline void clear_highpage(struct page *page)
186{
Cong Wang1ec9c5d2011-11-25 23:14:14 +0800187 void *kaddr = kmap_atomic(page);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700188 clear_page(kaddr);
Cong Wang1ec9c5d2011-11-25 23:14:14 +0800189 kunmap_atomic(kaddr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700190}
191
Christoph Lametereebd2aa2008-02-04 22:28:29 -0800192static inline void zero_user_segments(struct page *page,
193 unsigned start1, unsigned end1,
194 unsigned start2, unsigned end2)
195{
Cong Wang1ec9c5d2011-11-25 23:14:14 +0800196 void *kaddr = kmap_atomic(page);
Christoph Lametereebd2aa2008-02-04 22:28:29 -0800197
198 BUG_ON(end1 > PAGE_SIZE || end2 > PAGE_SIZE);
199
200 if (end1 > start1)
201 memset(kaddr + start1, 0, end1 - start1);
202
203 if (end2 > start2)
204 memset(kaddr + start2, 0, end2 - start2);
205
Cong Wang1ec9c5d2011-11-25 23:14:14 +0800206 kunmap_atomic(kaddr);
Christoph Lametereebd2aa2008-02-04 22:28:29 -0800207 flush_dcache_page(page);
208}
209
210static inline void zero_user_segment(struct page *page,
211 unsigned start, unsigned end)
212{
213 zero_user_segments(page, start, end, 0, 0);
214}
215
216static inline void zero_user(struct page *page,
217 unsigned start, unsigned size)
218{
219 zero_user_segments(page, start, start + size, 0, 0);
220}
Nate Diller01f27052007-05-09 02:35:07 -0700221
Atsushi Nemoto77fff4a2006-12-12 17:14:54 +0000222#ifndef __HAVE_ARCH_COPY_USER_HIGHPAGE
223
Atsushi Nemoto9de455b2006-12-12 17:14:55 +0000224static inline void copy_user_highpage(struct page *to, struct page *from,
225 unsigned long vaddr, struct vm_area_struct *vma)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700226{
227 char *vfrom, *vto;
228
Cong Wang1ec9c5d2011-11-25 23:14:14 +0800229 vfrom = kmap_atomic(from);
230 vto = kmap_atomic(to);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700231 copy_user_page(vto, vfrom, vaddr, to);
Cong Wang1ec9c5d2011-11-25 23:14:14 +0800232 kunmap_atomic(vto);
233 kunmap_atomic(vfrom);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700234}
235
Atsushi Nemoto77fff4a2006-12-12 17:14:54 +0000236#endif
237
Linus Torvalds1da177e2005-04-16 15:20:36 -0700238static inline void copy_highpage(struct page *to, struct page *from)
239{
240 char *vfrom, *vto;
241
Cong Wang1ec9c5d2011-11-25 23:14:14 +0800242 vfrom = kmap_atomic(from);
243 vto = kmap_atomic(to);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700244 copy_page(vto, vfrom);
Cong Wang1ec9c5d2011-11-25 23:14:14 +0800245 kunmap_atomic(vto);
246 kunmap_atomic(vfrom);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700247}
248
Linus Torvalds1da177e2005-04-16 15:20:36 -0700249#endif /* _LINUX_HIGHMEM_H */