hugetlbpage.c (f26e8817b235d8764363bffcc9cbfc61867371f2) hugetlbpage.c (c7d9f77d33a779ad582d8b2284ba007931ebd894)
1/*
2 * SPARC64 Huge TLB page support.
3 *
4 * Copyright (C) 2002, 2003, 2006 David S. Miller (davem@davemloft.net)
5 */
6
7#include <linux/fs.h>
8#include <linux/mm.h>

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23 */
24
25static unsigned long hugetlb_get_unmapped_area_bottomup(struct file *filp,
26 unsigned long addr,
27 unsigned long len,
28 unsigned long pgoff,
29 unsigned long flags)
30{
1/*
2 * SPARC64 Huge TLB page support.
3 *
4 * Copyright (C) 2002, 2003, 2006 David S. Miller (davem@davemloft.net)
5 */
6
7#include <linux/fs.h>
8#include <linux/mm.h>

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23 */
24
25static unsigned long hugetlb_get_unmapped_area_bottomup(struct file *filp,
26 unsigned long addr,
27 unsigned long len,
28 unsigned long pgoff,
29 unsigned long flags)
30{
31 struct hstate *h = hstate_file(filp);
31 unsigned long task_size = TASK_SIZE;
32 struct vm_unmapped_area_info info;
33
34 if (test_thread_flag(TIF_32BIT))
35 task_size = STACK_TOP32;
36
37 info.flags = 0;
38 info.length = len;
39 info.low_limit = TASK_UNMAPPED_BASE;
40 info.high_limit = min(task_size, VA_EXCLUDE_START);
32 unsigned long task_size = TASK_SIZE;
33 struct vm_unmapped_area_info info;
34
35 if (test_thread_flag(TIF_32BIT))
36 task_size = STACK_TOP32;
37
38 info.flags = 0;
39 info.length = len;
40 info.low_limit = TASK_UNMAPPED_BASE;
41 info.high_limit = min(task_size, VA_EXCLUDE_START);
41 info.align_mask = PAGE_MASK & ~HPAGE_MASK;
42 info.align_mask = PAGE_MASK & ~huge_page_mask(h);
42 info.align_offset = 0;
43 addr = vm_unmapped_area(&info);
44
45 if ((addr & ~PAGE_MASK) && task_size > VA_EXCLUDE_END) {
46 VM_BUG_ON(addr != -ENOMEM);
47 info.low_limit = VA_EXCLUDE_END;
48 info.high_limit = task_size;
49 addr = vm_unmapped_area(&info);
50 }
51
52 return addr;
53}
54
55static unsigned long
56hugetlb_get_unmapped_area_topdown(struct file *filp, const unsigned long addr0,
57 const unsigned long len,
58 const unsigned long pgoff,
59 const unsigned long flags)
60{
43 info.align_offset = 0;
44 addr = vm_unmapped_area(&info);
45
46 if ((addr & ~PAGE_MASK) && task_size > VA_EXCLUDE_END) {
47 VM_BUG_ON(addr != -ENOMEM);
48 info.low_limit = VA_EXCLUDE_END;
49 info.high_limit = task_size;
50 addr = vm_unmapped_area(&info);
51 }
52
53 return addr;
54}
55
56static unsigned long
57hugetlb_get_unmapped_area_topdown(struct file *filp, const unsigned long addr0,
58 const unsigned long len,
59 const unsigned long pgoff,
60 const unsigned long flags)
61{
62 struct hstate *h = hstate_file(filp);
61 struct mm_struct *mm = current->mm;
62 unsigned long addr = addr0;
63 struct vm_unmapped_area_info info;
64
65 /* This should only ever run for 32-bit processes. */
66 BUG_ON(!test_thread_flag(TIF_32BIT));
67
68 info.flags = VM_UNMAPPED_AREA_TOPDOWN;
69 info.length = len;
70 info.low_limit = PAGE_SIZE;
71 info.high_limit = mm->mmap_base;
63 struct mm_struct *mm = current->mm;
64 unsigned long addr = addr0;
65 struct vm_unmapped_area_info info;
66
67 /* This should only ever run for 32-bit processes. */
68 BUG_ON(!test_thread_flag(TIF_32BIT));
69
70 info.flags = VM_UNMAPPED_AREA_TOPDOWN;
71 info.length = len;
72 info.low_limit = PAGE_SIZE;
73 info.high_limit = mm->mmap_base;
72 info.align_mask = PAGE_MASK & ~HPAGE_MASK;
74 info.align_mask = PAGE_MASK & ~huge_page_mask(h);
73 info.align_offset = 0;
74 addr = vm_unmapped_area(&info);
75
76 /*
77 * A failed mmap() very likely causes application failure,
78 * so fall back to the bottom-up function here. This scenario
79 * can happen with large stack limits and large mmap()
80 * allocations.

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89
90 return addr;
91}
92
93unsigned long
94hugetlb_get_unmapped_area(struct file *file, unsigned long addr,
95 unsigned long len, unsigned long pgoff, unsigned long flags)
96{
75 info.align_offset = 0;
76 addr = vm_unmapped_area(&info);
77
78 /*
79 * A failed mmap() very likely causes application failure,
80 * so fall back to the bottom-up function here. This scenario
81 * can happen with large stack limits and large mmap()
82 * allocations.

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91
92 return addr;
93}
94
95unsigned long
96hugetlb_get_unmapped_area(struct file *file, unsigned long addr,
97 unsigned long len, unsigned long pgoff, unsigned long flags)
98{
99 struct hstate *h = hstate_file(file);
97 struct mm_struct *mm = current->mm;
98 struct vm_area_struct *vma;
99 unsigned long task_size = TASK_SIZE;
100
101 if (test_thread_flag(TIF_32BIT))
102 task_size = STACK_TOP32;
103
100 struct mm_struct *mm = current->mm;
101 struct vm_area_struct *vma;
102 unsigned long task_size = TASK_SIZE;
103
104 if (test_thread_flag(TIF_32BIT))
105 task_size = STACK_TOP32;
106
104 if (len & ~HPAGE_MASK)
107 if (len & ~huge_page_mask(h))
105 return -EINVAL;
106 if (len > task_size)
107 return -ENOMEM;
108
109 if (flags & MAP_FIXED) {
110 if (prepare_hugepage_range(file, addr, len))
111 return -EINVAL;
112 return addr;
113 }
114
115 if (addr) {
108 return -EINVAL;
109 if (len > task_size)
110 return -ENOMEM;
111
112 if (flags & MAP_FIXED) {
113 if (prepare_hugepage_range(file, addr, len))
114 return -EINVAL;
115 return addr;
116 }
117
118 if (addr) {
116 addr = ALIGN(addr, HPAGE_SIZE);
119 addr = ALIGN(addr, huge_page_size(h));
117 vma = find_vma(mm, addr);
118 if (task_size - len >= addr &&
119 (!vma || addr + len <= vma->vm_start))
120 return addr;
121 }
122 if (mm->get_unmapped_area == arch_get_unmapped_area)
123 return hugetlb_get_unmapped_area_bottomup(file, addr, len,
124 pgoff, flags);
125 else
126 return hugetlb_get_unmapped_area_topdown(file, addr, len,
127 pgoff, flags);
128}
129
120 vma = find_vma(mm, addr);
121 if (task_size - len >= addr &&
122 (!vma || addr + len <= vma->vm_start))
123 return addr;
124 }
125 if (mm->get_unmapped_area == arch_get_unmapped_area)
126 return hugetlb_get_unmapped_area_bottomup(file, addr, len,
127 pgoff, flags);
128 else
129 return hugetlb_get_unmapped_area_topdown(file, addr, len,
130 pgoff, flags);
131}
132
133static pte_t sun4u_hugepage_shift_to_tte(pte_t entry, unsigned int shift)
134{
135 return entry;
136}
137
138static pte_t sun4v_hugepage_shift_to_tte(pte_t entry, unsigned int shift)
139{
140 unsigned long hugepage_size = _PAGE_SZ4MB_4V;
141
142 pte_val(entry) = pte_val(entry) & ~_PAGE_SZALL_4V;
143
144 switch (shift) {
145 case HPAGE_256MB_SHIFT:
146 hugepage_size = _PAGE_SZ256MB_4V;
147 pte_val(entry) |= _PAGE_PMD_HUGE;
148 break;
149 case HPAGE_SHIFT:
150 pte_val(entry) |= _PAGE_PMD_HUGE;
151 break;
152 default:
153 WARN_ONCE(1, "unsupported hugepage shift=%u\n", shift);
154 }
155
156 pte_val(entry) = pte_val(entry) | hugepage_size;
157 return entry;
158}
159
160static pte_t hugepage_shift_to_tte(pte_t entry, unsigned int shift)
161{
162 if (tlb_type == hypervisor)
163 return sun4v_hugepage_shift_to_tte(entry, shift);
164 else
165 return sun4u_hugepage_shift_to_tte(entry, shift);
166}
167
168pte_t arch_make_huge_pte(pte_t entry, struct vm_area_struct *vma,
169 struct page *page, int writeable)
170{
171 unsigned int shift = huge_page_shift(hstate_vma(vma));
172
173 return hugepage_shift_to_tte(entry, shift);
174}
175
176static unsigned int sun4v_huge_tte_to_shift(pte_t entry)
177{
178 unsigned long tte_szbits = pte_val(entry) & _PAGE_SZALL_4V;
179 unsigned int shift;
180
181 switch (tte_szbits) {
182 case _PAGE_SZ256MB_4V:
183 shift = HPAGE_256MB_SHIFT;
184 break;
185 case _PAGE_SZ4MB_4V:
186 shift = REAL_HPAGE_SHIFT;
187 break;
188 default:
189 shift = PAGE_SHIFT;
190 break;
191 }
192 return shift;
193}
194
195static unsigned int sun4u_huge_tte_to_shift(pte_t entry)
196{
197 unsigned long tte_szbits = pte_val(entry) & _PAGE_SZALL_4U;
198 unsigned int shift;
199
200 switch (tte_szbits) {
201 case _PAGE_SZ256MB_4U:
202 shift = HPAGE_256MB_SHIFT;
203 break;
204 case _PAGE_SZ4MB_4U:
205 shift = REAL_HPAGE_SHIFT;
206 break;
207 default:
208 shift = PAGE_SHIFT;
209 break;
210 }
211 return shift;
212}
213
214static unsigned int huge_tte_to_shift(pte_t entry)
215{
216 unsigned long shift;
217
218 if (tlb_type == hypervisor)
219 shift = sun4v_huge_tte_to_shift(entry);
220 else
221 shift = sun4u_huge_tte_to_shift(entry);
222
223 if (shift == PAGE_SHIFT)
224 WARN_ONCE(1, "tto_to_shift: invalid hugepage tte=0x%lx\n",
225 pte_val(entry));
226
227 return shift;
228}
229
230static unsigned long huge_tte_to_size(pte_t pte)
231{
232 unsigned long size = 1UL << huge_tte_to_shift(pte);
233
234 if (size == REAL_HPAGE_SIZE)
235 size = HPAGE_SIZE;
236 return size;
237}
238
130pte_t *huge_pte_alloc(struct mm_struct *mm,
131 unsigned long addr, unsigned long sz)
132{
133 pgd_t *pgd;
134 pud_t *pud;
135 pte_t *pte = NULL;
136
137 pgd = pgd_offset(mm, addr);

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155 pte = (pte_t *)pmd_offset(pud, addr);
156 }
157 return pte;
158}
159
160void set_huge_pte_at(struct mm_struct *mm, unsigned long addr,
161 pte_t *ptep, pte_t entry)
162{
239pte_t *huge_pte_alloc(struct mm_struct *mm,
240 unsigned long addr, unsigned long sz)
241{
242 pgd_t *pgd;
243 pud_t *pud;
244 pte_t *pte = NULL;
245
246 pgd = pgd_offset(mm, addr);

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264 pte = (pte_t *)pmd_offset(pud, addr);
265 }
266 return pte;
267}
268
269void set_huge_pte_at(struct mm_struct *mm, unsigned long addr,
270 pte_t *ptep, pte_t entry)
271{
272 unsigned int i, nptes, hugepage_shift;
273 unsigned long size;
163 pte_t orig;
164
274 pte_t orig;
275
276 size = huge_tte_to_size(entry);
277 nptes = size >> PMD_SHIFT;
278
165 if (!pte_present(*ptep) && pte_present(entry))
279 if (!pte_present(*ptep) && pte_present(entry))
166 mm->context.hugetlb_pte_count++;
280 mm->context.hugetlb_pte_count += nptes;
167
281
168 addr &= HPAGE_MASK;
282 addr &= ~(size - 1);
169 orig = *ptep;
283 orig = *ptep;
170 *ptep = entry;
284 hugepage_shift = pte_none(orig) ? PAGE_SIZE : huge_tte_to_shift(orig);
171
285
172 /* Issue TLB flush at REAL_HPAGE_SIZE boundaries */
173 maybe_tlb_batch_add(mm, addr, ptep, orig, 0);
174 maybe_tlb_batch_add(mm, addr + REAL_HPAGE_SIZE, ptep, orig, 0);
286 for (i = 0; i < nptes; i++)
287 ptep[i] = __pte(pte_val(entry) + (i << PMD_SHIFT));
288
289 maybe_tlb_batch_add(mm, addr, ptep, orig, 0, hugepage_shift);
290 /* An HPAGE_SIZE'ed page is composed of two REAL_HPAGE_SIZE'ed pages */
291 if (size == HPAGE_SIZE)
292 maybe_tlb_batch_add(mm, addr + REAL_HPAGE_SIZE, ptep, orig, 0,
293 hugepage_shift);
175}
176
177pte_t huge_ptep_get_and_clear(struct mm_struct *mm, unsigned long addr,
178 pte_t *ptep)
179{
294}
295
296pte_t huge_ptep_get_and_clear(struct mm_struct *mm, unsigned long addr,
297 pte_t *ptep)
298{
299 unsigned int i, nptes, hugepage_shift;
300 unsigned long size;
180 pte_t entry;
181
182 entry = *ptep;
301 pte_t entry;
302
303 entry = *ptep;
304 size = huge_tte_to_size(entry);
305 nptes = size >> PMD_SHIFT;
306 hugepage_shift = pte_none(entry) ? PAGE_SIZE : huge_tte_to_shift(entry);
307
183 if (pte_present(entry))
308 if (pte_present(entry))
184 mm->context.hugetlb_pte_count--;
309 mm->context.hugetlb_pte_count -= nptes;
185
310
186 addr &= HPAGE_MASK;
187 *ptep = __pte(0UL);
311 addr &= ~(size - 1);
312 for (i = 0; i < nptes; i++)
313 ptep[i] = __pte(0UL);
188
314
189 /* Issue TLB flush at REAL_HPAGE_SIZE boundaries */
190 maybe_tlb_batch_add(mm, addr, ptep, entry, 0);
191 maybe_tlb_batch_add(mm, addr + REAL_HPAGE_SIZE, ptep, entry, 0);
315 maybe_tlb_batch_add(mm, addr, ptep, entry, 0, hugepage_shift);
316 /* An HPAGE_SIZE'ed page is composed of two REAL_HPAGE_SIZE'ed pages */
317 if (size == HPAGE_SIZE)
318 maybe_tlb_batch_add(mm, addr + REAL_HPAGE_SIZE, ptep, entry, 0,
319 hugepage_shift);
192
193 return entry;
194}
195
196int pmd_huge(pmd_t pmd)
197{
198 return !pmd_none(pmd) &&
199 (pmd_val(pmd) & (_PAGE_VALID|_PAGE_PMD_HUGE)) != _PAGE_VALID;

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321 return entry;
322}
323
324int pmd_huge(pmd_t pmd)
325{
326 return !pmd_none(pmd) &&
327 (pmd_val(pmd) & (_PAGE_VALID|_PAGE_PMD_HUGE)) != _PAGE_VALID;

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