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-rw-r--r--arch/sh/mm/hugetlbpage.c196
1 files changed, 24 insertions, 172 deletions
diff --git a/arch/sh/mm/hugetlbpage.c b/arch/sh/mm/hugetlbpage.c
index 1f897bab2318..95bb1a6c6060 100644
--- a/arch/sh/mm/hugetlbpage.c
+++ b/arch/sh/mm/hugetlbpage.c
@@ -24,7 +24,7 @@
24#include <asm/tlbflush.h> 24#include <asm/tlbflush.h>
25#include <asm/cacheflush.h> 25#include <asm/cacheflush.h>
26 26
27static pte_t *huge_pte_alloc(struct mm_struct *mm, unsigned long addr) 27pte_t *huge_pte_alloc(struct mm_struct *mm, unsigned long addr)
28{ 28{
29 pgd_t *pgd; 29 pgd_t *pgd;
30 pmd_t *pmd; 30 pmd_t *pmd;
@@ -39,7 +39,7 @@ static pte_t *huge_pte_alloc(struct mm_struct *mm, unsigned long addr)
39 return pte; 39 return pte;
40} 40}
41 41
42static pte_t *huge_pte_offset(struct mm_struct *mm, unsigned long addr) 42pte_t *huge_pte_offset(struct mm_struct *mm, unsigned long addr)
43{ 43{
44 pgd_t *pgd; 44 pgd_t *pgd;
45 pmd_t *pmd; 45 pmd_t *pmd;
@@ -56,28 +56,34 @@ static pte_t *huge_pte_offset(struct mm_struct *mm, unsigned long addr)
56 56
57#define mk_pte_huge(entry) do { pte_val(entry) |= _PAGE_SZHUGE; } while (0) 57#define mk_pte_huge(entry) do { pte_val(entry) |= _PAGE_SZHUGE; } while (0)
58 58
59static void set_huge_pte(struct mm_struct *mm, struct vm_area_struct *vma, 59void set_huge_pte_at(struct mm_struct *mm, unsigned long addr,
60 struct page *page, pte_t * page_table, int write_access) 60 pte_t *ptep, pte_t entry)
61{ 61{
62 unsigned long i; 62 int i;
63 pte_t entry;
64 63
65 add_mm_counter(mm, rss, HPAGE_SIZE / PAGE_SIZE); 64 for (i = 0; i < (1 << HUGETLB_PAGE_ORDER); i++) {
65 set_pte_at(mm, addr, ptep, entry);
66 ptep++;
67 addr += PAGE_SIZE;
68 pte_val(entry) += PAGE_SIZE;
69 }
70}
66 71
67 if (write_access) 72pte_t huge_ptep_get_and_clear(struct mm_struct *mm, unsigned long addr,
68 entry = pte_mkwrite(pte_mkdirty(mk_pte(page, 73 pte_t *ptep)
69 vma->vm_page_prot))); 74{
70 else 75 pte_t entry;
71 entry = pte_wrprotect(mk_pte(page, vma->vm_page_prot)); 76 int i;
72 entry = pte_mkyoung(entry);
73 mk_pte_huge(entry);
74 77
75 for (i = 0; i < (1 << HUGETLB_PAGE_ORDER); i++) { 78 entry = *ptep;
76 set_pte(page_table, entry);
77 page_table++;
78 79
79 pte_val(entry) += PAGE_SIZE; 80 for (i = 0; i < (1 << HUGETLB_PAGE_ORDER); i++) {
81 pte_clear(mm, addr, ptep);
82 addr += PAGE_SIZE;
83 ptep++;
80 } 84 }
85
86 return entry;
81} 87}
82 88
83/* 89/*
@@ -92,79 +98,6 @@ int is_aligned_hugepage_range(unsigned long addr, unsigned long len)
92 return 0; 98 return 0;
93} 99}
94 100
95int copy_hugetlb_page_range(struct mm_struct *dst, struct mm_struct *src,
96 struct vm_area_struct *vma)
97{
98 pte_t *src_pte, *dst_pte, entry;
99 struct page *ptepage;
100 unsigned long addr = vma->vm_start;
101 unsigned long end = vma->vm_end;
102 int i;
103
104 while (addr < end) {
105 dst_pte = huge_pte_alloc(dst, addr);
106 if (!dst_pte)
107 goto nomem;
108 src_pte = huge_pte_offset(src, addr);
109 BUG_ON(!src_pte || pte_none(*src_pte));
110 entry = *src_pte;
111 ptepage = pte_page(entry);
112 get_page(ptepage);
113 for (i = 0; i < (1 << HUGETLB_PAGE_ORDER); i++) {
114 set_pte(dst_pte, entry);
115 pte_val(entry) += PAGE_SIZE;
116 dst_pte++;
117 }
118 add_mm_counter(dst, rss, HPAGE_SIZE / PAGE_SIZE);
119 addr += HPAGE_SIZE;
120 }
121 return 0;
122
123nomem:
124 return -ENOMEM;
125}
126
127int follow_hugetlb_page(struct mm_struct *mm, struct vm_area_struct *vma,
128 struct page **pages, struct vm_area_struct **vmas,
129 unsigned long *position, int *length, int i)
130{
131 unsigned long vaddr = *position;
132 int remainder = *length;
133
134 WARN_ON(!is_vm_hugetlb_page(vma));
135
136 while (vaddr < vma->vm_end && remainder) {
137 if (pages) {
138 pte_t *pte;
139 struct page *page;
140
141 pte = huge_pte_offset(mm, vaddr);
142
143 /* hugetlb should be locked, and hence, prefaulted */
144 BUG_ON(!pte || pte_none(*pte));
145
146 page = pte_page(*pte);
147
148 WARN_ON(!PageCompound(page));
149
150 get_page(page);
151 pages[i] = page;
152 }
153
154 if (vmas)
155 vmas[i] = vma;
156
157 vaddr += PAGE_SIZE;
158 --remainder;
159 ++i;
160 }
161
162 *length = remainder;
163 *position = vaddr;
164
165 return i;
166}
167
168struct page *follow_huge_addr(struct mm_struct *mm, 101struct page *follow_huge_addr(struct mm_struct *mm,
169 unsigned long address, int write) 102 unsigned long address, int write)
170{ 103{
@@ -181,84 +114,3 @@ struct page *follow_huge_pmd(struct mm_struct *mm, unsigned long address,
181{ 114{
182 return NULL; 115 return NULL;
183} 116}
184
185void unmap_hugepage_range(struct vm_area_struct *vma,
186 unsigned long start, unsigned long end)
187{
188 struct mm_struct *mm = vma->vm_mm;
189 unsigned long address;
190 pte_t *pte;
191 struct page *page;
192 int i;
193
194 BUG_ON(start & (HPAGE_SIZE - 1));
195 BUG_ON(end & (HPAGE_SIZE - 1));
196
197 for (address = start; address < end; address += HPAGE_SIZE) {
198 pte = huge_pte_offset(mm, address);
199 BUG_ON(!pte);
200 if (pte_none(*pte))
201 continue;
202 page = pte_page(*pte);
203 put_page(page);
204 for (i = 0; i < (1 << HUGETLB_PAGE_ORDER); i++) {
205 pte_clear(mm, address+(i*PAGE_SIZE), pte);
206 pte++;
207 }
208 }
209 add_mm_counter(mm, rss, -((end - start) >> PAGE_SHIFT));
210 flush_tlb_range(vma, start, end);
211}
212
213int hugetlb_prefault(struct address_space *mapping, struct vm_area_struct *vma)
214{
215 struct mm_struct *mm = current->mm;
216 unsigned long addr;
217 int ret = 0;
218
219 BUG_ON(vma->vm_start & ~HPAGE_MASK);
220 BUG_ON(vma->vm_end & ~HPAGE_MASK);
221
222 spin_lock(&mm->page_table_lock);
223 for (addr = vma->vm_start; addr < vma->vm_end; addr += HPAGE_SIZE) {
224 unsigned long idx;
225 pte_t *pte = huge_pte_alloc(mm, addr);
226 struct page *page;
227
228 if (!pte) {
229 ret = -ENOMEM;
230 goto out;
231 }
232 if (!pte_none(*pte))
233 continue;
234
235 idx = ((addr - vma->vm_start) >> HPAGE_SHIFT)
236 + (vma->vm_pgoff >> (HPAGE_SHIFT - PAGE_SHIFT));
237 page = find_get_page(mapping, idx);
238 if (!page) {
239 /* charge the fs quota first */
240 if (hugetlb_get_quota(mapping)) {
241 ret = -ENOMEM;
242 goto out;
243 }
244 page = alloc_huge_page();
245 if (!page) {
246 hugetlb_put_quota(mapping);
247 ret = -ENOMEM;
248 goto out;
249 }
250 ret = add_to_page_cache(page, mapping, idx, GFP_ATOMIC);
251 if (! ret) {
252 unlock_page(page);
253 } else {
254 hugetlb_put_quota(mapping);
255 free_huge_page(page);
256 goto out;
257 }
258 }
259 set_huge_pte(mm, vma, page, pte, vma->vm_flags & VM_WRITE);
260 }
261out:
262 spin_unlock(&mm->page_table_lock);
263 return ret;
264}
generated by cgit v1.2.2 (git 2.25.0) at 2024-12-15 13:59:42 -0500