Loading...
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/pgtable.h>
18#include <asm/tlb.h>
19#include <asm/tlbflush.h>
20#include <asm/cacheflush.h>
21#include <asm/mmu_context.h>
22
23/* Slightly simplified from the non-hugepage variant because by
24 * definition we don't have to worry about any page coloring stuff
25 */
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 hstate *h = hstate_file(filp);
34 unsigned long task_size = TASK_SIZE;
35 struct vm_unmapped_area_info info;
36
37 if (test_thread_flag(TIF_32BIT))
38 task_size = STACK_TOP32;
39
40 info.flags = 0;
41 info.length = len;
42 info.low_limit = TASK_UNMAPPED_BASE;
43 info.high_limit = min(task_size, VA_EXCLUDE_START);
44 info.align_mask = PAGE_MASK & ~huge_page_mask(h);
45 info.align_offset = 0;
46 addr = vm_unmapped_area(&info);
47
48 if ((addr & ~PAGE_MASK) && task_size > VA_EXCLUDE_END) {
49 VM_BUG_ON(addr != -ENOMEM);
50 info.low_limit = VA_EXCLUDE_END;
51 info.high_limit = task_size;
52 addr = vm_unmapped_area(&info);
53 }
54
55 return addr;
56}
57
58static unsigned long
59hugetlb_get_unmapped_area_topdown(struct file *filp, const unsigned long addr0,
60 const unsigned long len,
61 const unsigned long pgoff,
62 const unsigned long flags)
63{
64 struct hstate *h = hstate_file(filp);
65 struct mm_struct *mm = current->mm;
66 unsigned long addr = addr0;
67 struct vm_unmapped_area_info info;
68
69 /* This should only ever run for 32-bit processes. */
70 BUG_ON(!test_thread_flag(TIF_32BIT));
71
72 info.flags = VM_UNMAPPED_AREA_TOPDOWN;
73 info.length = len;
74 info.low_limit = PAGE_SIZE;
75 info.high_limit = mm->mmap_base;
76 info.align_mask = PAGE_MASK & ~huge_page_mask(h);
77 info.align_offset = 0;
78 addr = vm_unmapped_area(&info);
79
80 /*
81 * A failed mmap() very likely causes application failure,
82 * so fall back to the bottom-up function here. This scenario
83 * can happen with large stack limits and large mmap()
84 * allocations.
85 */
86 if (addr & ~PAGE_MASK) {
87 VM_BUG_ON(addr != -ENOMEM);
88 info.flags = 0;
89 info.low_limit = TASK_UNMAPPED_BASE;
90 info.high_limit = STACK_TOP32;
91 addr = vm_unmapped_area(&info);
92 }
93
94 return addr;
95}
96
97unsigned long
98hugetlb_get_unmapped_area(struct file *file, unsigned long addr,
99 unsigned long len, unsigned long pgoff, unsigned long flags)
100{
101 struct hstate *h = hstate_file(file);
102 struct mm_struct *mm = current->mm;
103 struct vm_area_struct *vma;
104 unsigned long task_size = TASK_SIZE;
105
106 if (test_thread_flag(TIF_32BIT))
107 task_size = STACK_TOP32;
108
109 if (len & ~huge_page_mask(h))
110 return -EINVAL;
111 if (len > task_size)
112 return -ENOMEM;
113
114 if (flags & MAP_FIXED) {
115 if (prepare_hugepage_range(file, addr, len))
116 return -EINVAL;
117 return addr;
118 }
119
120 if (addr) {
121 addr = ALIGN(addr, huge_page_size(h));
122 vma = find_vma(mm, addr);
123 if (task_size - len >= addr &&
124 (!vma || addr + len <= vm_start_gap(vma)))
125 return addr;
126 }
127 if (mm->get_unmapped_area == arch_get_unmapped_area)
128 return hugetlb_get_unmapped_area_bottomup(file, addr, len,
129 pgoff, flags);
130 else
131 return hugetlb_get_unmapped_area_topdown(file, addr, len,
132 pgoff, flags);
133}
134
135static pte_t sun4u_hugepage_shift_to_tte(pte_t entry, unsigned int shift)
136{
137 return entry;
138}
139
140static pte_t sun4v_hugepage_shift_to_tte(pte_t entry, unsigned int shift)
141{
142 unsigned long hugepage_size = _PAGE_SZ4MB_4V;
143
144 pte_val(entry) = pte_val(entry) & ~_PAGE_SZALL_4V;
145
146 switch (shift) {
147 case HPAGE_16GB_SHIFT:
148 hugepage_size = _PAGE_SZ16GB_4V;
149 pte_val(entry) |= _PAGE_PUD_HUGE;
150 break;
151 case HPAGE_2GB_SHIFT:
152 hugepage_size = _PAGE_SZ2GB_4V;
153 pte_val(entry) |= _PAGE_PMD_HUGE;
154 break;
155 case HPAGE_256MB_SHIFT:
156 hugepage_size = _PAGE_SZ256MB_4V;
157 pte_val(entry) |= _PAGE_PMD_HUGE;
158 break;
159 case HPAGE_SHIFT:
160 pte_val(entry) |= _PAGE_PMD_HUGE;
161 break;
162 case HPAGE_64K_SHIFT:
163 hugepage_size = _PAGE_SZ64K_4V;
164 break;
165 default:
166 WARN_ONCE(1, "unsupported hugepage shift=%u\n", shift);
167 }
168
169 pte_val(entry) = pte_val(entry) | hugepage_size;
170 return entry;
171}
172
173static pte_t hugepage_shift_to_tte(pte_t entry, unsigned int shift)
174{
175 if (tlb_type == hypervisor)
176 return sun4v_hugepage_shift_to_tte(entry, shift);
177 else
178 return sun4u_hugepage_shift_to_tte(entry, shift);
179}
180
181pte_t arch_make_huge_pte(pte_t entry, struct vm_area_struct *vma,
182 struct page *page, int writeable)
183{
184 unsigned int shift = huge_page_shift(hstate_vma(vma));
185 pte_t pte;
186
187 pte = hugepage_shift_to_tte(entry, shift);
188
189#ifdef CONFIG_SPARC64
190 /* If this vma has ADI enabled on it, turn on TTE.mcd
191 */
192 if (vma->vm_flags & VM_SPARC_ADI)
193 return pte_mkmcd(pte);
194 else
195 return pte_mknotmcd(pte);
196#else
197 return pte;
198#endif
199}
200
201static unsigned int sun4v_huge_tte_to_shift(pte_t entry)
202{
203 unsigned long tte_szbits = pte_val(entry) & _PAGE_SZALL_4V;
204 unsigned int shift;
205
206 switch (tte_szbits) {
207 case _PAGE_SZ16GB_4V:
208 shift = HPAGE_16GB_SHIFT;
209 break;
210 case _PAGE_SZ2GB_4V:
211 shift = HPAGE_2GB_SHIFT;
212 break;
213 case _PAGE_SZ256MB_4V:
214 shift = HPAGE_256MB_SHIFT;
215 break;
216 case _PAGE_SZ4MB_4V:
217 shift = REAL_HPAGE_SHIFT;
218 break;
219 case _PAGE_SZ64K_4V:
220 shift = HPAGE_64K_SHIFT;
221 break;
222 default:
223 shift = PAGE_SHIFT;
224 break;
225 }
226 return shift;
227}
228
229static unsigned int sun4u_huge_tte_to_shift(pte_t entry)
230{
231 unsigned long tte_szbits = pte_val(entry) & _PAGE_SZALL_4U;
232 unsigned int shift;
233
234 switch (tte_szbits) {
235 case _PAGE_SZ256MB_4U:
236 shift = HPAGE_256MB_SHIFT;
237 break;
238 case _PAGE_SZ4MB_4U:
239 shift = REAL_HPAGE_SHIFT;
240 break;
241 case _PAGE_SZ64K_4U:
242 shift = HPAGE_64K_SHIFT;
243 break;
244 default:
245 shift = PAGE_SHIFT;
246 break;
247 }
248 return shift;
249}
250
251static unsigned int huge_tte_to_shift(pte_t entry)
252{
253 unsigned long shift;
254
255 if (tlb_type == hypervisor)
256 shift = sun4v_huge_tte_to_shift(entry);
257 else
258 shift = sun4u_huge_tte_to_shift(entry);
259
260 if (shift == PAGE_SHIFT)
261 WARN_ONCE(1, "tto_to_shift: invalid hugepage tte=0x%lx\n",
262 pte_val(entry));
263
264 return shift;
265}
266
267static unsigned long huge_tte_to_size(pte_t pte)
268{
269 unsigned long size = 1UL << huge_tte_to_shift(pte);
270
271 if (size == REAL_HPAGE_SIZE)
272 size = HPAGE_SIZE;
273 return size;
274}
275
276pte_t *huge_pte_alloc(struct mm_struct *mm,
277 unsigned long addr, unsigned long sz)
278{
279 pgd_t *pgd;
280 pud_t *pud;
281 pmd_t *pmd;
282
283 pgd = pgd_offset(mm, addr);
284 pud = pud_alloc(mm, pgd, addr);
285 if (!pud)
286 return NULL;
287 if (sz >= PUD_SIZE)
288 return (pte_t *)pud;
289 pmd = pmd_alloc(mm, pud, addr);
290 if (!pmd)
291 return NULL;
292 if (sz >= PMD_SIZE)
293 return (pte_t *)pmd;
294 return pte_alloc_map(mm, pmd, addr);
295}
296
297pte_t *huge_pte_offset(struct mm_struct *mm,
298 unsigned long addr, unsigned long sz)
299{
300 pgd_t *pgd;
301 pud_t *pud;
302 pmd_t *pmd;
303
304 pgd = pgd_offset(mm, addr);
305 if (pgd_none(*pgd))
306 return NULL;
307 pud = pud_offset(pgd, addr);
308 if (pud_none(*pud))
309 return NULL;
310 if (is_hugetlb_pud(*pud))
311 return (pte_t *)pud;
312 pmd = pmd_offset(pud, addr);
313 if (pmd_none(*pmd))
314 return NULL;
315 if (is_hugetlb_pmd(*pmd))
316 return (pte_t *)pmd;
317 return pte_offset_map(pmd, addr);
318}
319
320void set_huge_pte_at(struct mm_struct *mm, unsigned long addr,
321 pte_t *ptep, pte_t entry)
322{
323 unsigned int nptes, orig_shift, shift;
324 unsigned long i, size;
325 pte_t orig;
326
327 size = huge_tte_to_size(entry);
328
329 shift = PAGE_SHIFT;
330 if (size >= PUD_SIZE)
331 shift = PUD_SHIFT;
332 else if (size >= PMD_SIZE)
333 shift = PMD_SHIFT;
334 else
335 shift = PAGE_SHIFT;
336
337 nptes = size >> shift;
338
339 if (!pte_present(*ptep) && pte_present(entry))
340 mm->context.hugetlb_pte_count += nptes;
341
342 addr &= ~(size - 1);
343 orig = *ptep;
344 orig_shift = pte_none(orig) ? PAGE_SHIFT : huge_tte_to_shift(orig);
345
346 for (i = 0; i < nptes; i++)
347 ptep[i] = __pte(pte_val(entry) + (i << shift));
348
349 maybe_tlb_batch_add(mm, addr, ptep, orig, 0, orig_shift);
350 /* An HPAGE_SIZE'ed page is composed of two REAL_HPAGE_SIZE'ed pages */
351 if (size == HPAGE_SIZE)
352 maybe_tlb_batch_add(mm, addr + REAL_HPAGE_SIZE, ptep, orig, 0,
353 orig_shift);
354}
355
356pte_t huge_ptep_get_and_clear(struct mm_struct *mm, unsigned long addr,
357 pte_t *ptep)
358{
359 unsigned int i, nptes, orig_shift, shift;
360 unsigned long size;
361 pte_t entry;
362
363 entry = *ptep;
364 size = huge_tte_to_size(entry);
365
366 shift = PAGE_SHIFT;
367 if (size >= PUD_SIZE)
368 shift = PUD_SHIFT;
369 else if (size >= PMD_SIZE)
370 shift = PMD_SHIFT;
371 else
372 shift = PAGE_SHIFT;
373
374 nptes = size >> shift;
375 orig_shift = pte_none(entry) ? PAGE_SHIFT : huge_tte_to_shift(entry);
376
377 if (pte_present(entry))
378 mm->context.hugetlb_pte_count -= nptes;
379
380 addr &= ~(size - 1);
381 for (i = 0; i < nptes; i++)
382 ptep[i] = __pte(0UL);
383
384 maybe_tlb_batch_add(mm, addr, ptep, entry, 0, orig_shift);
385 /* An HPAGE_SIZE'ed page is composed of two REAL_HPAGE_SIZE'ed pages */
386 if (size == HPAGE_SIZE)
387 maybe_tlb_batch_add(mm, addr + REAL_HPAGE_SIZE, ptep, entry, 0,
388 orig_shift);
389
390 return entry;
391}
392
393int pmd_huge(pmd_t pmd)
394{
395 return !pmd_none(pmd) &&
396 (pmd_val(pmd) & (_PAGE_VALID|_PAGE_PMD_HUGE)) != _PAGE_VALID;
397}
398
399int pud_huge(pud_t pud)
400{
401 return !pud_none(pud) &&
402 (pud_val(pud) & (_PAGE_VALID|_PAGE_PUD_HUGE)) != _PAGE_VALID;
403}
404
405static void hugetlb_free_pte_range(struct mmu_gather *tlb, pmd_t *pmd,
406 unsigned long addr)
407{
408 pgtable_t token = pmd_pgtable(*pmd);
409
410 pmd_clear(pmd);
411 pte_free_tlb(tlb, token, addr);
412 mm_dec_nr_ptes(tlb->mm);
413}
414
415static void hugetlb_free_pmd_range(struct mmu_gather *tlb, pud_t *pud,
416 unsigned long addr, unsigned long end,
417 unsigned long floor, unsigned long ceiling)
418{
419 pmd_t *pmd;
420 unsigned long next;
421 unsigned long start;
422
423 start = addr;
424 pmd = pmd_offset(pud, addr);
425 do {
426 next = pmd_addr_end(addr, end);
427 if (pmd_none(*pmd))
428 continue;
429 if (is_hugetlb_pmd(*pmd))
430 pmd_clear(pmd);
431 else
432 hugetlb_free_pte_range(tlb, pmd, addr);
433 } while (pmd++, addr = next, addr != end);
434
435 start &= PUD_MASK;
436 if (start < floor)
437 return;
438 if (ceiling) {
439 ceiling &= PUD_MASK;
440 if (!ceiling)
441 return;
442 }
443 if (end - 1 > ceiling - 1)
444 return;
445
446 pmd = pmd_offset(pud, start);
447 pud_clear(pud);
448 pmd_free_tlb(tlb, pmd, start);
449 mm_dec_nr_pmds(tlb->mm);
450}
451
452static void hugetlb_free_pud_range(struct mmu_gather *tlb, pgd_t *pgd,
453 unsigned long addr, unsigned long end,
454 unsigned long floor, unsigned long ceiling)
455{
456 pud_t *pud;
457 unsigned long next;
458 unsigned long start;
459
460 start = addr;
461 pud = pud_offset(pgd, addr);
462 do {
463 next = pud_addr_end(addr, end);
464 if (pud_none_or_clear_bad(pud))
465 continue;
466 if (is_hugetlb_pud(*pud))
467 pud_clear(pud);
468 else
469 hugetlb_free_pmd_range(tlb, pud, addr, next, floor,
470 ceiling);
471 } while (pud++, addr = next, addr != end);
472
473 start &= PGDIR_MASK;
474 if (start < floor)
475 return;
476 if (ceiling) {
477 ceiling &= PGDIR_MASK;
478 if (!ceiling)
479 return;
480 }
481 if (end - 1 > ceiling - 1)
482 return;
483
484 pud = pud_offset(pgd, start);
485 pgd_clear(pgd);
486 pud_free_tlb(tlb, pud, start);
487 mm_dec_nr_puds(tlb->mm);
488}
489
490void hugetlb_free_pgd_range(struct mmu_gather *tlb,
491 unsigned long addr, unsigned long end,
492 unsigned long floor, unsigned long ceiling)
493{
494 pgd_t *pgd;
495 unsigned long next;
496
497 addr &= PMD_MASK;
498 if (addr < floor) {
499 addr += PMD_SIZE;
500 if (!addr)
501 return;
502 }
503 if (ceiling) {
504 ceiling &= PMD_MASK;
505 if (!ceiling)
506 return;
507 }
508 if (end - 1 > ceiling - 1)
509 end -= PMD_SIZE;
510 if (addr > end - 1)
511 return;
512
513 pgd = pgd_offset(tlb->mm, addr);
514 do {
515 next = pgd_addr_end(addr, end);
516 if (pgd_none_or_clear_bad(pgd))
517 continue;
518 hugetlb_free_pud_range(tlb, pgd, addr, next, floor, ceiling);
519 } while (pgd++, addr = next, addr != end);
520}
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}