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1// SPDX-License-Identifier: GPL-2.0
2/*
3 * SPARC64 Huge TLB page support.
4 *
5 * Copyright (C) 2002, 2003, 2006 David S. Miller (davem@davemloft.net)
6 */
7
8#include <linux/fs.h>
9#include <linux/mm.h>
10#include <linux/sched/mm.h>
11#include <linux/hugetlb.h>
12#include <linux/pagemap.h>
13#include <linux/sysctl.h>
14
15#include <asm/mman.h>
16#include <asm/pgalloc.h>
17#include <asm/tlb.h>
18#include <asm/tlbflush.h>
19#include <asm/cacheflush.h>
20#include <asm/mmu_context.h>
21
22/* Slightly simplified from the non-hugepage variant because by
23 * definition we don't have to worry about any page coloring stuff
24 */
25
26static unsigned long hugetlb_get_unmapped_area_bottomup(struct file *filp,
27 unsigned long addr,
28 unsigned long len,
29 unsigned long pgoff,
30 unsigned long flags)
31{
32 struct hstate *h = hstate_file(filp);
33 unsigned long task_size = TASK_SIZE;
34 struct vm_unmapped_area_info info;
35
36 if (test_thread_flag(TIF_32BIT))
37 task_size = STACK_TOP32;
38
39 info.flags = 0;
40 info.length = len;
41 info.low_limit = TASK_UNMAPPED_BASE;
42 info.high_limit = min(task_size, VA_EXCLUDE_START);
43 info.align_mask = PAGE_MASK & ~huge_page_mask(h);
44 info.align_offset = 0;
45 addr = vm_unmapped_area(&info);
46
47 if ((addr & ~PAGE_MASK) && task_size > VA_EXCLUDE_END) {
48 VM_BUG_ON(addr != -ENOMEM);
49 info.low_limit = VA_EXCLUDE_END;
50 info.high_limit = task_size;
51 addr = vm_unmapped_area(&info);
52 }
53
54 return addr;
55}
56
57static unsigned long
58hugetlb_get_unmapped_area_topdown(struct file *filp, const unsigned long addr0,
59 const unsigned long len,
60 const unsigned long pgoff,
61 const unsigned long flags)
62{
63 struct hstate *h = hstate_file(filp);
64 struct mm_struct *mm = current->mm;
65 unsigned long addr = addr0;
66 struct vm_unmapped_area_info info;
67
68 /* This should only ever run for 32-bit processes. */
69 BUG_ON(!test_thread_flag(TIF_32BIT));
70
71 info.flags = VM_UNMAPPED_AREA_TOPDOWN;
72 info.length = len;
73 info.low_limit = PAGE_SIZE;
74 info.high_limit = mm->mmap_base;
75 info.align_mask = PAGE_MASK & ~huge_page_mask(h);
76 info.align_offset = 0;
77 addr = vm_unmapped_area(&info);
78
79 /*
80 * A failed mmap() very likely causes application failure,
81 * so fall back to the bottom-up function here. This scenario
82 * can happen with large stack limits and large mmap()
83 * allocations.
84 */
85 if (addr & ~PAGE_MASK) {
86 VM_BUG_ON(addr != -ENOMEM);
87 info.flags = 0;
88 info.low_limit = TASK_UNMAPPED_BASE;
89 info.high_limit = STACK_TOP32;
90 addr = vm_unmapped_area(&info);
91 }
92
93 return addr;
94}
95
96unsigned long
97hugetlb_get_unmapped_area(struct file *file, unsigned long addr,
98 unsigned long len, unsigned long pgoff, unsigned long flags)
99{
100 struct hstate *h = hstate_file(file);
101 struct mm_struct *mm = current->mm;
102 struct vm_area_struct *vma;
103 unsigned long task_size = TASK_SIZE;
104
105 if (test_thread_flag(TIF_32BIT))
106 task_size = STACK_TOP32;
107
108 if (len & ~huge_page_mask(h))
109 return -EINVAL;
110 if (len > task_size)
111 return -ENOMEM;
112
113 if (flags & MAP_FIXED) {
114 if (prepare_hugepage_range(file, addr, len))
115 return -EINVAL;
116 return addr;
117 }
118
119 if (addr) {
120 addr = ALIGN(addr, huge_page_size(h));
121 vma = find_vma(mm, addr);
122 if (task_size - len >= addr &&
123 (!vma || addr + len <= vm_start_gap(vma)))
124 return addr;
125 }
126 if (mm->get_unmapped_area == arch_get_unmapped_area)
127 return hugetlb_get_unmapped_area_bottomup(file, addr, len,
128 pgoff, flags);
129 else
130 return hugetlb_get_unmapped_area_topdown(file, addr, len,
131 pgoff, flags);
132}
133
134static pte_t sun4u_hugepage_shift_to_tte(pte_t entry, unsigned int shift)
135{
136 return entry;
137}
138
139static pte_t sun4v_hugepage_shift_to_tte(pte_t entry, unsigned int shift)
140{
141 unsigned long hugepage_size = _PAGE_SZ4MB_4V;
142
143 pte_val(entry) = pte_val(entry) & ~_PAGE_SZALL_4V;
144
145 switch (shift) {
146 case HPAGE_16GB_SHIFT:
147 hugepage_size = _PAGE_SZ16GB_4V;
148 pte_val(entry) |= _PAGE_PUD_HUGE;
149 break;
150 case HPAGE_2GB_SHIFT:
151 hugepage_size = _PAGE_SZ2GB_4V;
152 pte_val(entry) |= _PAGE_PMD_HUGE;
153 break;
154 case HPAGE_256MB_SHIFT:
155 hugepage_size = _PAGE_SZ256MB_4V;
156 pte_val(entry) |= _PAGE_PMD_HUGE;
157 break;
158 case HPAGE_SHIFT:
159 pte_val(entry) |= _PAGE_PMD_HUGE;
160 break;
161 case HPAGE_64K_SHIFT:
162 hugepage_size = _PAGE_SZ64K_4V;
163 break;
164 default:
165 WARN_ONCE(1, "unsupported hugepage shift=%u\n", shift);
166 }
167
168 pte_val(entry) = pte_val(entry) | hugepage_size;
169 return entry;
170}
171
172static pte_t hugepage_shift_to_tte(pte_t entry, unsigned int shift)
173{
174 if (tlb_type == hypervisor)
175 return sun4v_hugepage_shift_to_tte(entry, shift);
176 else
177 return sun4u_hugepage_shift_to_tte(entry, shift);
178}
179
180pte_t arch_make_huge_pte(pte_t entry, unsigned int shift, vm_flags_t flags)
181{
182 pte_t pte;
183
184 entry = pte_mkhuge(entry);
185 pte = hugepage_shift_to_tte(entry, shift);
186
187#ifdef CONFIG_SPARC64
188 /* If this vma has ADI enabled on it, turn on TTE.mcd
189 */
190 if (flags & VM_SPARC_ADI)
191 return pte_mkmcd(pte);
192 else
193 return pte_mknotmcd(pte);
194#else
195 return pte;
196#endif
197}
198
199static unsigned int sun4v_huge_tte_to_shift(pte_t entry)
200{
201 unsigned long tte_szbits = pte_val(entry) & _PAGE_SZALL_4V;
202 unsigned int shift;
203
204 switch (tte_szbits) {
205 case _PAGE_SZ16GB_4V:
206 shift = HPAGE_16GB_SHIFT;
207 break;
208 case _PAGE_SZ2GB_4V:
209 shift = HPAGE_2GB_SHIFT;
210 break;
211 case _PAGE_SZ256MB_4V:
212 shift = HPAGE_256MB_SHIFT;
213 break;
214 case _PAGE_SZ4MB_4V:
215 shift = REAL_HPAGE_SHIFT;
216 break;
217 case _PAGE_SZ64K_4V:
218 shift = HPAGE_64K_SHIFT;
219 break;
220 default:
221 shift = PAGE_SHIFT;
222 break;
223 }
224 return shift;
225}
226
227static unsigned int sun4u_huge_tte_to_shift(pte_t entry)
228{
229 unsigned long tte_szbits = pte_val(entry) & _PAGE_SZALL_4U;
230 unsigned int shift;
231
232 switch (tte_szbits) {
233 case _PAGE_SZ256MB_4U:
234 shift = HPAGE_256MB_SHIFT;
235 break;
236 case _PAGE_SZ4MB_4U:
237 shift = REAL_HPAGE_SHIFT;
238 break;
239 case _PAGE_SZ64K_4U:
240 shift = HPAGE_64K_SHIFT;
241 break;
242 default:
243 shift = PAGE_SHIFT;
244 break;
245 }
246 return shift;
247}
248
249static unsigned long tte_to_shift(pte_t entry)
250{
251 if (tlb_type == hypervisor)
252 return sun4v_huge_tte_to_shift(entry);
253
254 return sun4u_huge_tte_to_shift(entry);
255}
256
257static unsigned int huge_tte_to_shift(pte_t entry)
258{
259 unsigned long shift = tte_to_shift(entry);
260
261 if (shift == PAGE_SHIFT)
262 WARN_ONCE(1, "tto_to_shift: invalid hugepage tte=0x%lx\n",
263 pte_val(entry));
264
265 return shift;
266}
267
268static unsigned long huge_tte_to_size(pte_t pte)
269{
270 unsigned long size = 1UL << huge_tte_to_shift(pte);
271
272 if (size == REAL_HPAGE_SIZE)
273 size = HPAGE_SIZE;
274 return size;
275}
276
277unsigned long pud_leaf_size(pud_t pud) { return 1UL << tte_to_shift(*(pte_t *)&pud); }
278unsigned long pmd_leaf_size(pmd_t pmd) { return 1UL << tte_to_shift(*(pte_t *)&pmd); }
279unsigned long pte_leaf_size(pte_t pte) { return 1UL << tte_to_shift(pte); }
280
281pte_t *huge_pte_alloc(struct mm_struct *mm, struct vm_area_struct *vma,
282 unsigned long addr, unsigned long sz)
283{
284 pgd_t *pgd;
285 p4d_t *p4d;
286 pud_t *pud;
287 pmd_t *pmd;
288
289 pgd = pgd_offset(mm, addr);
290 p4d = p4d_offset(pgd, addr);
291 pud = pud_alloc(mm, p4d, addr);
292 if (!pud)
293 return NULL;
294 if (sz >= PUD_SIZE)
295 return (pte_t *)pud;
296 pmd = pmd_alloc(mm, pud, addr);
297 if (!pmd)
298 return NULL;
299 if (sz >= PMD_SIZE)
300 return (pte_t *)pmd;
301 return pte_alloc_map(mm, pmd, addr);
302}
303
304pte_t *huge_pte_offset(struct mm_struct *mm,
305 unsigned long addr, unsigned long sz)
306{
307 pgd_t *pgd;
308 p4d_t *p4d;
309 pud_t *pud;
310 pmd_t *pmd;
311
312 pgd = pgd_offset(mm, addr);
313 if (pgd_none(*pgd))
314 return NULL;
315 p4d = p4d_offset(pgd, addr);
316 if (p4d_none(*p4d))
317 return NULL;
318 pud = pud_offset(p4d, addr);
319 if (pud_none(*pud))
320 return NULL;
321 if (is_hugetlb_pud(*pud))
322 return (pte_t *)pud;
323 pmd = pmd_offset(pud, addr);
324 if (pmd_none(*pmd))
325 return NULL;
326 if (is_hugetlb_pmd(*pmd))
327 return (pte_t *)pmd;
328 return pte_offset_map(pmd, addr);
329}
330
331void set_huge_pte_at(struct mm_struct *mm, unsigned long addr,
332 pte_t *ptep, pte_t entry)
333{
334 unsigned int nptes, orig_shift, shift;
335 unsigned long i, size;
336 pte_t orig;
337
338 size = huge_tte_to_size(entry);
339
340 shift = PAGE_SHIFT;
341 if (size >= PUD_SIZE)
342 shift = PUD_SHIFT;
343 else if (size >= PMD_SIZE)
344 shift = PMD_SHIFT;
345 else
346 shift = PAGE_SHIFT;
347
348 nptes = size >> shift;
349
350 if (!pte_present(*ptep) && pte_present(entry))
351 mm->context.hugetlb_pte_count += nptes;
352
353 addr &= ~(size - 1);
354 orig = *ptep;
355 orig_shift = pte_none(orig) ? PAGE_SHIFT : huge_tte_to_shift(orig);
356
357 for (i = 0; i < nptes; i++)
358 ptep[i] = __pte(pte_val(entry) + (i << shift));
359
360 maybe_tlb_batch_add(mm, addr, ptep, orig, 0, orig_shift);
361 /* An HPAGE_SIZE'ed page is composed of two REAL_HPAGE_SIZE'ed pages */
362 if (size == HPAGE_SIZE)
363 maybe_tlb_batch_add(mm, addr + REAL_HPAGE_SIZE, ptep, orig, 0,
364 orig_shift);
365}
366
367pte_t huge_ptep_get_and_clear(struct mm_struct *mm, unsigned long addr,
368 pte_t *ptep)
369{
370 unsigned int i, nptes, orig_shift, shift;
371 unsigned long size;
372 pte_t entry;
373
374 entry = *ptep;
375 size = huge_tte_to_size(entry);
376
377 shift = PAGE_SHIFT;
378 if (size >= PUD_SIZE)
379 shift = PUD_SHIFT;
380 else if (size >= PMD_SIZE)
381 shift = PMD_SHIFT;
382 else
383 shift = PAGE_SHIFT;
384
385 nptes = size >> shift;
386 orig_shift = pte_none(entry) ? PAGE_SHIFT : huge_tte_to_shift(entry);
387
388 if (pte_present(entry))
389 mm->context.hugetlb_pte_count -= nptes;
390
391 addr &= ~(size - 1);
392 for (i = 0; i < nptes; i++)
393 ptep[i] = __pte(0UL);
394
395 maybe_tlb_batch_add(mm, addr, ptep, entry, 0, orig_shift);
396 /* An HPAGE_SIZE'ed page is composed of two REAL_HPAGE_SIZE'ed pages */
397 if (size == HPAGE_SIZE)
398 maybe_tlb_batch_add(mm, addr + REAL_HPAGE_SIZE, ptep, entry, 0,
399 orig_shift);
400
401 return entry;
402}
403
404int pmd_huge(pmd_t pmd)
405{
406 return !pmd_none(pmd) &&
407 (pmd_val(pmd) & (_PAGE_VALID|_PAGE_PMD_HUGE)) != _PAGE_VALID;
408}
409
410int pud_huge(pud_t pud)
411{
412 return !pud_none(pud) &&
413 (pud_val(pud) & (_PAGE_VALID|_PAGE_PUD_HUGE)) != _PAGE_VALID;
414}
415
416static void hugetlb_free_pte_range(struct mmu_gather *tlb, pmd_t *pmd,
417 unsigned long addr)
418{
419 pgtable_t token = pmd_pgtable(*pmd);
420
421 pmd_clear(pmd);
422 pte_free_tlb(tlb, token, addr);
423 mm_dec_nr_ptes(tlb->mm);
424}
425
426static void hugetlb_free_pmd_range(struct mmu_gather *tlb, pud_t *pud,
427 unsigned long addr, unsigned long end,
428 unsigned long floor, unsigned long ceiling)
429{
430 pmd_t *pmd;
431 unsigned long next;
432 unsigned long start;
433
434 start = addr;
435 pmd = pmd_offset(pud, addr);
436 do {
437 next = pmd_addr_end(addr, end);
438 if (pmd_none(*pmd))
439 continue;
440 if (is_hugetlb_pmd(*pmd))
441 pmd_clear(pmd);
442 else
443 hugetlb_free_pte_range(tlb, pmd, addr);
444 } while (pmd++, addr = next, addr != end);
445
446 start &= PUD_MASK;
447 if (start < floor)
448 return;
449 if (ceiling) {
450 ceiling &= PUD_MASK;
451 if (!ceiling)
452 return;
453 }
454 if (end - 1 > ceiling - 1)
455 return;
456
457 pmd = pmd_offset(pud, start);
458 pud_clear(pud);
459 pmd_free_tlb(tlb, pmd, start);
460 mm_dec_nr_pmds(tlb->mm);
461}
462
463static void hugetlb_free_pud_range(struct mmu_gather *tlb, p4d_t *p4d,
464 unsigned long addr, unsigned long end,
465 unsigned long floor, unsigned long ceiling)
466{
467 pud_t *pud;
468 unsigned long next;
469 unsigned long start;
470
471 start = addr;
472 pud = pud_offset(p4d, addr);
473 do {
474 next = pud_addr_end(addr, end);
475 if (pud_none_or_clear_bad(pud))
476 continue;
477 if (is_hugetlb_pud(*pud))
478 pud_clear(pud);
479 else
480 hugetlb_free_pmd_range(tlb, pud, addr, next, floor,
481 ceiling);
482 } while (pud++, addr = next, addr != end);
483
484 start &= PGDIR_MASK;
485 if (start < floor)
486 return;
487 if (ceiling) {
488 ceiling &= PGDIR_MASK;
489 if (!ceiling)
490 return;
491 }
492 if (end - 1 > ceiling - 1)
493 return;
494
495 pud = pud_offset(p4d, start);
496 p4d_clear(p4d);
497 pud_free_tlb(tlb, pud, start);
498 mm_dec_nr_puds(tlb->mm);
499}
500
501void hugetlb_free_pgd_range(struct mmu_gather *tlb,
502 unsigned long addr, unsigned long end,
503 unsigned long floor, unsigned long ceiling)
504{
505 pgd_t *pgd;
506 p4d_t *p4d;
507 unsigned long next;
508
509 addr &= PMD_MASK;
510 if (addr < floor) {
511 addr += PMD_SIZE;
512 if (!addr)
513 return;
514 }
515 if (ceiling) {
516 ceiling &= PMD_MASK;
517 if (!ceiling)
518 return;
519 }
520 if (end - 1 > ceiling - 1)
521 end -= PMD_SIZE;
522 if (addr > end - 1)
523 return;
524
525 pgd = pgd_offset(tlb->mm, addr);
526 p4d = p4d_offset(pgd, addr);
527 do {
528 next = p4d_addr_end(addr, end);
529 if (p4d_none_or_clear_bad(p4d))
530 continue;
531 hugetlb_free_pud_range(tlb, p4d, addr, next, floor, ceiling);
532 } while (p4d++, addr = next, addr != end);
533}
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/init.h>
8#include <linux/fs.h>
9#include <linux/mm.h>
10#include <linux/hugetlb.h>
11#include <linux/pagemap.h>
12#include <linux/sysctl.h>
13
14#include <asm/mman.h>
15#include <asm/pgalloc.h>
16#include <asm/tlb.h>
17#include <asm/tlbflush.h>
18#include <asm/cacheflush.h>
19#include <asm/mmu_context.h>
20
21/* Slightly simplified from the non-hugepage variant because by
22 * definition we don't have to worry about any page coloring stuff
23 */
24#define VA_EXCLUDE_START (0x0000080000000000UL - (1UL << 32UL))
25#define VA_EXCLUDE_END (0xfffff80000000000UL + (1UL << 32UL))
26
27static unsigned long hugetlb_get_unmapped_area_bottomup(struct file *filp,
28 unsigned long addr,
29 unsigned long len,
30 unsigned long pgoff,
31 unsigned long flags)
32{
33 struct mm_struct *mm = current->mm;
34 struct vm_area_struct * vma;
35 unsigned long task_size = TASK_SIZE;
36 unsigned long start_addr;
37
38 if (test_thread_flag(TIF_32BIT))
39 task_size = STACK_TOP32;
40 if (unlikely(len >= VA_EXCLUDE_START))
41 return -ENOMEM;
42
43 if (len > mm->cached_hole_size) {
44 start_addr = addr = mm->free_area_cache;
45 } else {
46 start_addr = addr = TASK_UNMAPPED_BASE;
47 mm->cached_hole_size = 0;
48 }
49
50 task_size -= len;
51
52full_search:
53 addr = ALIGN(addr, HPAGE_SIZE);
54
55 for (vma = find_vma(mm, addr); ; vma = vma->vm_next) {
56 /* At this point: (!vma || addr < vma->vm_end). */
57 if (addr < VA_EXCLUDE_START &&
58 (addr + len) >= VA_EXCLUDE_START) {
59 addr = VA_EXCLUDE_END;
60 vma = find_vma(mm, VA_EXCLUDE_END);
61 }
62 if (unlikely(task_size < addr)) {
63 if (start_addr != TASK_UNMAPPED_BASE) {
64 start_addr = addr = TASK_UNMAPPED_BASE;
65 mm->cached_hole_size = 0;
66 goto full_search;
67 }
68 return -ENOMEM;
69 }
70 if (likely(!vma || addr + len <= vma->vm_start)) {
71 /*
72 * Remember the place where we stopped the search:
73 */
74 mm->free_area_cache = addr + len;
75 return addr;
76 }
77 if (addr + mm->cached_hole_size < vma->vm_start)
78 mm->cached_hole_size = vma->vm_start - addr;
79
80 addr = ALIGN(vma->vm_end, HPAGE_SIZE);
81 }
82}
83
84static unsigned long
85hugetlb_get_unmapped_area_topdown(struct file *filp, const unsigned long addr0,
86 const unsigned long len,
87 const unsigned long pgoff,
88 const unsigned long flags)
89{
90 struct vm_area_struct *vma;
91 struct mm_struct *mm = current->mm;
92 unsigned long addr = addr0;
93
94 /* This should only ever run for 32-bit processes. */
95 BUG_ON(!test_thread_flag(TIF_32BIT));
96
97 /* check if free_area_cache is useful for us */
98 if (len <= mm->cached_hole_size) {
99 mm->cached_hole_size = 0;
100 mm->free_area_cache = mm->mmap_base;
101 }
102
103 /* either no address requested or can't fit in requested address hole */
104 addr = mm->free_area_cache & HPAGE_MASK;
105
106 /* make sure it can fit in the remaining address space */
107 if (likely(addr > len)) {
108 vma = find_vma(mm, addr-len);
109 if (!vma || addr <= vma->vm_start) {
110 /* remember the address as a hint for next time */
111 return (mm->free_area_cache = addr-len);
112 }
113 }
114
115 if (unlikely(mm->mmap_base < len))
116 goto bottomup;
117
118 addr = (mm->mmap_base-len) & HPAGE_MASK;
119
120 do {
121 /*
122 * Lookup failure means no vma is above this address,
123 * else if new region fits below vma->vm_start,
124 * return with success:
125 */
126 vma = find_vma(mm, addr);
127 if (likely(!vma || addr+len <= vma->vm_start)) {
128 /* remember the address as a hint for next time */
129 return (mm->free_area_cache = addr);
130 }
131
132 /* remember the largest hole we saw so far */
133 if (addr + mm->cached_hole_size < vma->vm_start)
134 mm->cached_hole_size = vma->vm_start - addr;
135
136 /* try just below the current vma->vm_start */
137 addr = (vma->vm_start-len) & HPAGE_MASK;
138 } while (likely(len < vma->vm_start));
139
140bottomup:
141 /*
142 * A failed mmap() very likely causes application failure,
143 * so fall back to the bottom-up function here. This scenario
144 * can happen with large stack limits and large mmap()
145 * allocations.
146 */
147 mm->cached_hole_size = ~0UL;
148 mm->free_area_cache = TASK_UNMAPPED_BASE;
149 addr = arch_get_unmapped_area(filp, addr0, len, pgoff, flags);
150 /*
151 * Restore the topdown base:
152 */
153 mm->free_area_cache = mm->mmap_base;
154 mm->cached_hole_size = ~0UL;
155
156 return addr;
157}
158
159unsigned long
160hugetlb_get_unmapped_area(struct file *file, unsigned long addr,
161 unsigned long len, unsigned long pgoff, unsigned long flags)
162{
163 struct mm_struct *mm = current->mm;
164 struct vm_area_struct *vma;
165 unsigned long task_size = TASK_SIZE;
166
167 if (test_thread_flag(TIF_32BIT))
168 task_size = STACK_TOP32;
169
170 if (len & ~HPAGE_MASK)
171 return -EINVAL;
172 if (len > task_size)
173 return -ENOMEM;
174
175 if (flags & MAP_FIXED) {
176 if (prepare_hugepage_range(file, addr, len))
177 return -EINVAL;
178 return addr;
179 }
180
181 if (addr) {
182 addr = ALIGN(addr, HPAGE_SIZE);
183 vma = find_vma(mm, addr);
184 if (task_size - len >= addr &&
185 (!vma || addr + len <= vma->vm_start))
186 return addr;
187 }
188 if (mm->get_unmapped_area == arch_get_unmapped_area)
189 return hugetlb_get_unmapped_area_bottomup(file, addr, len,
190 pgoff, flags);
191 else
192 return hugetlb_get_unmapped_area_topdown(file, addr, len,
193 pgoff, flags);
194}
195
196pte_t *huge_pte_alloc(struct mm_struct *mm,
197 unsigned long addr, unsigned long sz)
198{
199 pgd_t *pgd;
200 pud_t *pud;
201 pmd_t *pmd;
202 pte_t *pte = NULL;
203
204 /* We must align the address, because our caller will run
205 * set_huge_pte_at() on whatever we return, which writes out
206 * all of the sub-ptes for the hugepage range. So we have
207 * to give it the first such sub-pte.
208 */
209 addr &= HPAGE_MASK;
210
211 pgd = pgd_offset(mm, addr);
212 pud = pud_alloc(mm, pgd, addr);
213 if (pud) {
214 pmd = pmd_alloc(mm, pud, addr);
215 if (pmd)
216 pte = pte_alloc_map(mm, NULL, pmd, addr);
217 }
218 return pte;
219}
220
221pte_t *huge_pte_offset(struct mm_struct *mm, unsigned long addr)
222{
223 pgd_t *pgd;
224 pud_t *pud;
225 pmd_t *pmd;
226 pte_t *pte = NULL;
227
228 addr &= HPAGE_MASK;
229
230 pgd = pgd_offset(mm, addr);
231 if (!pgd_none(*pgd)) {
232 pud = pud_offset(pgd, addr);
233 if (!pud_none(*pud)) {
234 pmd = pmd_offset(pud, addr);
235 if (!pmd_none(*pmd))
236 pte = pte_offset_map(pmd, addr);
237 }
238 }
239 return pte;
240}
241
242int huge_pmd_unshare(struct mm_struct *mm, unsigned long *addr, pte_t *ptep)
243{
244 return 0;
245}
246
247void set_huge_pte_at(struct mm_struct *mm, unsigned long addr,
248 pte_t *ptep, pte_t entry)
249{
250 int i;
251
252 if (!pte_present(*ptep) && pte_present(entry))
253 mm->context.huge_pte_count++;
254
255 addr &= HPAGE_MASK;
256 for (i = 0; i < (1 << HUGETLB_PAGE_ORDER); i++) {
257 set_pte_at(mm, addr, ptep, entry);
258 ptep++;
259 addr += PAGE_SIZE;
260 pte_val(entry) += PAGE_SIZE;
261 }
262}
263
264pte_t huge_ptep_get_and_clear(struct mm_struct *mm, unsigned long addr,
265 pte_t *ptep)
266{
267 pte_t entry;
268 int i;
269
270 entry = *ptep;
271 if (pte_present(entry))
272 mm->context.huge_pte_count--;
273
274 addr &= HPAGE_MASK;
275
276 for (i = 0; i < (1 << HUGETLB_PAGE_ORDER); i++) {
277 pte_clear(mm, addr, ptep);
278 addr += PAGE_SIZE;
279 ptep++;
280 }
281
282 return entry;
283}
284
285struct page *follow_huge_addr(struct mm_struct *mm,
286 unsigned long address, int write)
287{
288 return ERR_PTR(-EINVAL);
289}
290
291int pmd_huge(pmd_t pmd)
292{
293 return 0;
294}
295
296int pud_huge(pud_t pud)
297{
298 return 0;
299}
300
301struct page *follow_huge_pmd(struct mm_struct *mm, unsigned long address,
302 pmd_t *pmd, int write)
303{
304 return NULL;
305}
306
307static void context_reload(void *__data)
308{
309 struct mm_struct *mm = __data;
310
311 if (mm == current->mm)
312 load_secondary_context(mm);
313}
314
315void hugetlb_prefault_arch_hook(struct mm_struct *mm)
316{
317 struct tsb_config *tp = &mm->context.tsb_block[MM_TSB_HUGE];
318
319 if (likely(tp->tsb != NULL))
320 return;
321
322 tsb_grow(mm, MM_TSB_HUGE, 0);
323 tsb_context_switch(mm);
324 smp_tsb_sync(mm);
325
326 /* On UltraSPARC-III+ and later, configure the second half of
327 * the Data-TLB for huge pages.
328 */
329 if (tlb_type == cheetah_plus) {
330 unsigned long ctx;
331
332 spin_lock(&ctx_alloc_lock);
333 ctx = mm->context.sparc64_ctx_val;
334 ctx &= ~CTX_PGSZ_MASK;
335 ctx |= CTX_PGSZ_BASE << CTX_PGSZ0_SHIFT;
336 ctx |= CTX_PGSZ_HUGE << CTX_PGSZ1_SHIFT;
337
338 if (ctx != mm->context.sparc64_ctx_val) {
339 /* When changing the page size fields, we
340 * must perform a context flush so that no
341 * stale entries match. This flush must
342 * occur with the original context register
343 * settings.
344 */
345 do_flush_tlb_mm(mm);
346
347 /* Reload the context register of all processors
348 * also executing in this address space.
349 */
350 mm->context.sparc64_ctx_val = ctx;
351 on_each_cpu(context_reload, mm, 0);
352 }
353 spin_unlock(&ctx_alloc_lock);
354 }
355}