Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * PPC64 (POWER4) Huge TLB Page Support for Kernel. | |
3 | * | |
4 | * Copyright (C) 2003 David Gibson, IBM Corporation. | |
5 | * | |
6 | * Based on the IA-32 version: | |
7 | * Copyright (C) 2002, Rohit Seth <rohit.seth@intel.com> | |
8 | */ | |
9 | ||
1da177e4 | 10 | #include <linux/mm.h> |
883a3e52 | 11 | #include <linux/io.h> |
5a0e3ad6 | 12 | #include <linux/slab.h> |
1da177e4 | 13 | #include <linux/hugetlb.h> |
883a3e52 | 14 | #include <asm/pgtable.h> |
1da177e4 LT |
15 | #include <asm/pgalloc.h> |
16 | #include <asm/tlb.h> | |
1da177e4 | 17 | |
91224346 JT |
18 | #define PAGE_SHIFT_64K 16 |
19 | #define PAGE_SHIFT_16M 24 | |
20 | #define PAGE_SHIFT_16G 34 | |
4ec161cf | 21 | |
ec4b2c0c JT |
22 | #define MAX_NUMBER_GPAGES 1024 |
23 | ||
24 | /* Tracks the 16G pages after the device tree is scanned and before the | |
25 | * huge_boot_pages list is ready. */ | |
26 | static unsigned long gpage_freearray[MAX_NUMBER_GPAGES]; | |
27 | static unsigned nr_gpages; | |
c594adad | 28 | |
f10a04c0 DG |
29 | /* Flag to mark huge PD pointers. This means pmd_bad() and pud_bad() |
30 | * will choke on pointers to hugepte tables, which is handy for | |
31 | * catching screwups early. */ | |
f10a04c0 | 32 | |
0d9ea754 JT |
33 | static inline int shift_to_mmu_psize(unsigned int shift) |
34 | { | |
d1837cba DG |
35 | int psize; |
36 | ||
37 | for (psize = 0; psize < MMU_PAGE_COUNT; ++psize) | |
38 | if (mmu_psize_defs[psize].shift == shift) | |
39 | return psize; | |
0d9ea754 JT |
40 | return -1; |
41 | } | |
42 | ||
43 | static inline unsigned int mmu_psize_to_shift(unsigned int mmu_psize) | |
44 | { | |
45 | if (mmu_psize_defs[mmu_psize].shift) | |
46 | return mmu_psize_defs[mmu_psize].shift; | |
47 | BUG(); | |
48 | } | |
49 | ||
a4fe3ce7 DG |
50 | #define hugepd_none(hpd) ((hpd).pd == 0) |
51 | ||
f10a04c0 DG |
52 | static inline pte_t *hugepd_page(hugepd_t hpd) |
53 | { | |
a4fe3ce7 DG |
54 | BUG_ON(!hugepd_ok(hpd)); |
55 | return (pte_t *)((hpd.pd & ~HUGEPD_SHIFT_MASK) | 0xc000000000000000); | |
56 | } | |
57 | ||
58 | static inline unsigned int hugepd_shift(hugepd_t hpd) | |
59 | { | |
60 | return hpd.pd & HUGEPD_SHIFT_MASK; | |
f10a04c0 DG |
61 | } |
62 | ||
a4fe3ce7 | 63 | static inline pte_t *hugepte_offset(hugepd_t *hpdp, unsigned long addr, unsigned pdshift) |
f10a04c0 | 64 | { |
a4fe3ce7 | 65 | unsigned long idx = (addr & ((1UL << pdshift) - 1)) >> hugepd_shift(*hpdp); |
f10a04c0 DG |
66 | pte_t *dir = hugepd_page(*hpdp); |
67 | ||
68 | return dir + idx; | |
69 | } | |
70 | ||
a4fe3ce7 DG |
71 | pte_t *find_linux_pte_or_hugepte(pgd_t *pgdir, unsigned long ea, unsigned *shift) |
72 | { | |
73 | pgd_t *pg; | |
74 | pud_t *pu; | |
75 | pmd_t *pm; | |
76 | hugepd_t *hpdp = NULL; | |
77 | unsigned pdshift = PGDIR_SHIFT; | |
78 | ||
79 | if (shift) | |
80 | *shift = 0; | |
81 | ||
82 | pg = pgdir + pgd_index(ea); | |
83 | if (is_hugepd(pg)) { | |
84 | hpdp = (hugepd_t *)pg; | |
85 | } else if (!pgd_none(*pg)) { | |
86 | pdshift = PUD_SHIFT; | |
87 | pu = pud_offset(pg, ea); | |
88 | if (is_hugepd(pu)) | |
89 | hpdp = (hugepd_t *)pu; | |
90 | else if (!pud_none(*pu)) { | |
91 | pdshift = PMD_SHIFT; | |
92 | pm = pmd_offset(pu, ea); | |
93 | if (is_hugepd(pm)) | |
94 | hpdp = (hugepd_t *)pm; | |
95 | else if (!pmd_none(*pm)) { | |
96 | return pte_offset_map(pm, ea); | |
97 | } | |
98 | } | |
99 | } | |
100 | ||
101 | if (!hpdp) | |
102 | return NULL; | |
103 | ||
104 | if (shift) | |
105 | *shift = hugepd_shift(*hpdp); | |
106 | return hugepte_offset(hpdp, ea, pdshift); | |
107 | } | |
108 | ||
109 | pte_t *huge_pte_offset(struct mm_struct *mm, unsigned long addr) | |
110 | { | |
111 | return find_linux_pte_or_hugepte(mm->pgd, addr, NULL); | |
112 | } | |
113 | ||
f10a04c0 | 114 | static int __hugepte_alloc(struct mm_struct *mm, hugepd_t *hpdp, |
a4fe3ce7 | 115 | unsigned long address, unsigned pdshift, unsigned pshift) |
f10a04c0 | 116 | { |
a4fe3ce7 | 117 | pte_t *new = kmem_cache_zalloc(PGT_CACHE(pdshift - pshift), |
a0668cdc | 118 | GFP_KERNEL|__GFP_REPEAT); |
f10a04c0 | 119 | |
a4fe3ce7 DG |
120 | BUG_ON(pshift > HUGEPD_SHIFT_MASK); |
121 | BUG_ON((unsigned long)new & HUGEPD_SHIFT_MASK); | |
122 | ||
f10a04c0 DG |
123 | if (! new) |
124 | return -ENOMEM; | |
125 | ||
126 | spin_lock(&mm->page_table_lock); | |
127 | if (!hugepd_none(*hpdp)) | |
a4fe3ce7 | 128 | kmem_cache_free(PGT_CACHE(pdshift - pshift), new); |
f10a04c0 | 129 | else |
a4fe3ce7 | 130 | hpdp->pd = ((unsigned long)new & ~0x8000000000000000) | pshift; |
f10a04c0 DG |
131 | spin_unlock(&mm->page_table_lock); |
132 | return 0; | |
133 | } | |
134 | ||
a4fe3ce7 | 135 | pte_t *huge_pte_alloc(struct mm_struct *mm, unsigned long addr, unsigned long sz) |
0b26425c | 136 | { |
a4fe3ce7 DG |
137 | pgd_t *pg; |
138 | pud_t *pu; | |
139 | pmd_t *pm; | |
140 | hugepd_t *hpdp = NULL; | |
141 | unsigned pshift = __ffs(sz); | |
142 | unsigned pdshift = PGDIR_SHIFT; | |
143 | ||
144 | addr &= ~(sz-1); | |
145 | ||
146 | pg = pgd_offset(mm, addr); | |
147 | if (pshift >= PUD_SHIFT) { | |
148 | hpdp = (hugepd_t *)pg; | |
149 | } else { | |
150 | pdshift = PUD_SHIFT; | |
151 | pu = pud_alloc(mm, pg, addr); | |
152 | if (pshift >= PMD_SHIFT) { | |
153 | hpdp = (hugepd_t *)pu; | |
154 | } else { | |
155 | pdshift = PMD_SHIFT; | |
156 | pm = pmd_alloc(mm, pu, addr); | |
157 | hpdp = (hugepd_t *)pm; | |
158 | } | |
159 | } | |
160 | ||
161 | if (!hpdp) | |
162 | return NULL; | |
163 | ||
164 | BUG_ON(!hugepd_none(*hpdp) && !hugepd_ok(*hpdp)); | |
165 | ||
166 | if (hugepd_none(*hpdp) && __hugepte_alloc(mm, hpdp, addr, pdshift, pshift)) | |
167 | return NULL; | |
168 | ||
169 | return hugepte_offset(hpdp, addr, pdshift); | |
4ec161cf | 170 | } |
4ec161cf | 171 | |
658013e9 JT |
172 | /* Build list of addresses of gigantic pages. This function is used in early |
173 | * boot before the buddy or bootmem allocator is setup. | |
174 | */ | |
175 | void add_gpage(unsigned long addr, unsigned long page_size, | |
176 | unsigned long number_of_pages) | |
177 | { | |
178 | if (!addr) | |
179 | return; | |
180 | while (number_of_pages > 0) { | |
181 | gpage_freearray[nr_gpages] = addr; | |
182 | nr_gpages++; | |
183 | number_of_pages--; | |
184 | addr += page_size; | |
185 | } | |
186 | } | |
187 | ||
ec4b2c0c | 188 | /* Moves the gigantic page addresses from the temporary list to the |
0d9ea754 JT |
189 | * huge_boot_pages list. |
190 | */ | |
191 | int alloc_bootmem_huge_page(struct hstate *hstate) | |
ec4b2c0c JT |
192 | { |
193 | struct huge_bootmem_page *m; | |
194 | if (nr_gpages == 0) | |
195 | return 0; | |
196 | m = phys_to_virt(gpage_freearray[--nr_gpages]); | |
197 | gpage_freearray[nr_gpages] = 0; | |
198 | list_add(&m->list, &huge_boot_pages); | |
0d9ea754 | 199 | m->hstate = hstate; |
ec4b2c0c JT |
200 | return 1; |
201 | } | |
202 | ||
39dde65c KC |
203 | int huge_pmd_unshare(struct mm_struct *mm, unsigned long *addr, pte_t *ptep) |
204 | { | |
205 | return 0; | |
206 | } | |
207 | ||
a4fe3ce7 DG |
208 | static void free_hugepd_range(struct mmu_gather *tlb, hugepd_t *hpdp, int pdshift, |
209 | unsigned long start, unsigned long end, | |
210 | unsigned long floor, unsigned long ceiling) | |
f10a04c0 DG |
211 | { |
212 | pte_t *hugepte = hugepd_page(*hpdp); | |
a4fe3ce7 DG |
213 | unsigned shift = hugepd_shift(*hpdp); |
214 | unsigned long pdmask = ~((1UL << pdshift) - 1); | |
215 | ||
216 | start &= pdmask; | |
217 | if (start < floor) | |
218 | return; | |
219 | if (ceiling) { | |
220 | ceiling &= pdmask; | |
221 | if (! ceiling) | |
222 | return; | |
223 | } | |
224 | if (end - 1 > ceiling - 1) | |
225 | return; | |
f10a04c0 DG |
226 | |
227 | hpdp->pd = 0; | |
228 | tlb->need_flush = 1; | |
a4fe3ce7 | 229 | pgtable_free_tlb(tlb, hugepte, pdshift - shift); |
f10a04c0 DG |
230 | } |
231 | ||
f10a04c0 DG |
232 | static void hugetlb_free_pmd_range(struct mmu_gather *tlb, pud_t *pud, |
233 | unsigned long addr, unsigned long end, | |
a4fe3ce7 | 234 | unsigned long floor, unsigned long ceiling) |
f10a04c0 DG |
235 | { |
236 | pmd_t *pmd; | |
237 | unsigned long next; | |
238 | unsigned long start; | |
239 | ||
240 | start = addr; | |
241 | pmd = pmd_offset(pud, addr); | |
242 | do { | |
243 | next = pmd_addr_end(addr, end); | |
244 | if (pmd_none(*pmd)) | |
245 | continue; | |
a4fe3ce7 DG |
246 | free_hugepd_range(tlb, (hugepd_t *)pmd, PMD_SHIFT, |
247 | addr, next, floor, ceiling); | |
f10a04c0 DG |
248 | } while (pmd++, addr = next, addr != end); |
249 | ||
250 | start &= PUD_MASK; | |
251 | if (start < floor) | |
252 | return; | |
253 | if (ceiling) { | |
254 | ceiling &= PUD_MASK; | |
255 | if (!ceiling) | |
256 | return; | |
1da177e4 | 257 | } |
f10a04c0 DG |
258 | if (end - 1 > ceiling - 1) |
259 | return; | |
1da177e4 | 260 | |
f10a04c0 DG |
261 | pmd = pmd_offset(pud, start); |
262 | pud_clear(pud); | |
9e1b32ca | 263 | pmd_free_tlb(tlb, pmd, start); |
f10a04c0 | 264 | } |
f10a04c0 DG |
265 | |
266 | static void hugetlb_free_pud_range(struct mmu_gather *tlb, pgd_t *pgd, | |
267 | unsigned long addr, unsigned long end, | |
268 | unsigned long floor, unsigned long ceiling) | |
269 | { | |
270 | pud_t *pud; | |
271 | unsigned long next; | |
272 | unsigned long start; | |
273 | ||
274 | start = addr; | |
275 | pud = pud_offset(pgd, addr); | |
276 | do { | |
277 | next = pud_addr_end(addr, end); | |
a4fe3ce7 | 278 | if (!is_hugepd(pud)) { |
4ec161cf JT |
279 | if (pud_none_or_clear_bad(pud)) |
280 | continue; | |
0d9ea754 | 281 | hugetlb_free_pmd_range(tlb, pud, addr, next, floor, |
a4fe3ce7 | 282 | ceiling); |
4ec161cf | 283 | } else { |
a4fe3ce7 DG |
284 | free_hugepd_range(tlb, (hugepd_t *)pud, PUD_SHIFT, |
285 | addr, next, floor, ceiling); | |
4ec161cf | 286 | } |
f10a04c0 DG |
287 | } while (pud++, addr = next, addr != end); |
288 | ||
289 | start &= PGDIR_MASK; | |
290 | if (start < floor) | |
291 | return; | |
292 | if (ceiling) { | |
293 | ceiling &= PGDIR_MASK; | |
294 | if (!ceiling) | |
295 | return; | |
296 | } | |
297 | if (end - 1 > ceiling - 1) | |
298 | return; | |
299 | ||
300 | pud = pud_offset(pgd, start); | |
301 | pgd_clear(pgd); | |
9e1b32ca | 302 | pud_free_tlb(tlb, pud, start); |
f10a04c0 DG |
303 | } |
304 | ||
305 | /* | |
306 | * This function frees user-level page tables of a process. | |
307 | * | |
308 | * Must be called with pagetable lock held. | |
309 | */ | |
42b77728 | 310 | void hugetlb_free_pgd_range(struct mmu_gather *tlb, |
f10a04c0 DG |
311 | unsigned long addr, unsigned long end, |
312 | unsigned long floor, unsigned long ceiling) | |
313 | { | |
314 | pgd_t *pgd; | |
315 | unsigned long next; | |
f10a04c0 DG |
316 | |
317 | /* | |
a4fe3ce7 DG |
318 | * Because there are a number of different possible pagetable |
319 | * layouts for hugepage ranges, we limit knowledge of how | |
320 | * things should be laid out to the allocation path | |
321 | * (huge_pte_alloc(), above). Everything else works out the | |
322 | * structure as it goes from information in the hugepd | |
323 | * pointers. That means that we can't here use the | |
324 | * optimization used in the normal page free_pgd_range(), of | |
325 | * checking whether we're actually covering a large enough | |
326 | * range to have to do anything at the top level of the walk | |
327 | * instead of at the bottom. | |
f10a04c0 | 328 | * |
a4fe3ce7 DG |
329 | * To make sense of this, you should probably go read the big |
330 | * block comment at the top of the normal free_pgd_range(), | |
331 | * too. | |
f10a04c0 | 332 | */ |
f10a04c0 | 333 | |
42b77728 | 334 | pgd = pgd_offset(tlb->mm, addr); |
f10a04c0 | 335 | do { |
f10a04c0 | 336 | next = pgd_addr_end(addr, end); |
a4fe3ce7 | 337 | if (!is_hugepd(pgd)) { |
0b26425c DG |
338 | if (pgd_none_or_clear_bad(pgd)) |
339 | continue; | |
340 | hugetlb_free_pud_range(tlb, pgd, addr, next, floor, ceiling); | |
341 | } else { | |
a4fe3ce7 DG |
342 | free_hugepd_range(tlb, (hugepd_t *)pgd, PGDIR_SHIFT, |
343 | addr, next, floor, ceiling); | |
0b26425c | 344 | } |
f10a04c0 | 345 | } while (pgd++, addr = next, addr != end); |
1da177e4 LT |
346 | } |
347 | ||
1da177e4 LT |
348 | struct page * |
349 | follow_huge_addr(struct mm_struct *mm, unsigned long address, int write) | |
350 | { | |
351 | pte_t *ptep; | |
352 | struct page *page; | |
a4fe3ce7 DG |
353 | unsigned shift; |
354 | unsigned long mask; | |
355 | ||
356 | ptep = find_linux_pte_or_hugepte(mm->pgd, address, &shift); | |
1da177e4 | 357 | |
0d9ea754 | 358 | /* Verify it is a huge page else bail. */ |
a4fe3ce7 | 359 | if (!ptep || !shift) |
1da177e4 LT |
360 | return ERR_PTR(-EINVAL); |
361 | ||
a4fe3ce7 | 362 | mask = (1UL << shift) - 1; |
1da177e4 | 363 | page = pte_page(*ptep); |
a4fe3ce7 DG |
364 | if (page) |
365 | page += (address & mask) / PAGE_SIZE; | |
1da177e4 LT |
366 | |
367 | return page; | |
368 | } | |
369 | ||
370 | int pmd_huge(pmd_t pmd) | |
371 | { | |
372 | return 0; | |
373 | } | |
374 | ||
ceb86879 AK |
375 | int pud_huge(pud_t pud) |
376 | { | |
377 | return 0; | |
378 | } | |
379 | ||
1da177e4 LT |
380 | struct page * |
381 | follow_huge_pmd(struct mm_struct *mm, unsigned long address, | |
382 | pmd_t *pmd, int write) | |
383 | { | |
384 | BUG(); | |
385 | return NULL; | |
386 | } | |
387 | ||
a4fe3ce7 DG |
388 | static noinline int gup_hugepte(pte_t *ptep, unsigned long sz, unsigned long addr, |
389 | unsigned long end, int write, struct page **pages, int *nr) | |
390 | { | |
391 | unsigned long mask; | |
392 | unsigned long pte_end; | |
393 | struct page *head, *page; | |
394 | pte_t pte; | |
395 | int refs; | |
396 | ||
397 | pte_end = (addr + sz) & ~(sz-1); | |
398 | if (pte_end < end) | |
399 | end = pte_end; | |
400 | ||
401 | pte = *ptep; | |
402 | mask = _PAGE_PRESENT | _PAGE_USER; | |
403 | if (write) | |
404 | mask |= _PAGE_RW; | |
405 | ||
406 | if ((pte_val(pte) & mask) != mask) | |
407 | return 0; | |
408 | ||
409 | /* hugepages are never "special" */ | |
410 | VM_BUG_ON(!pfn_valid(pte_pfn(pte))); | |
411 | ||
412 | refs = 0; | |
413 | head = pte_page(pte); | |
414 | ||
415 | page = head + ((addr & (sz-1)) >> PAGE_SHIFT); | |
416 | do { | |
417 | VM_BUG_ON(compound_head(page) != head); | |
418 | pages[*nr] = page; | |
419 | (*nr)++; | |
420 | page++; | |
421 | refs++; | |
422 | } while (addr += PAGE_SIZE, addr != end); | |
423 | ||
424 | if (!page_cache_add_speculative(head, refs)) { | |
425 | *nr -= refs; | |
426 | return 0; | |
427 | } | |
428 | ||
429 | if (unlikely(pte_val(pte) != pte_val(*ptep))) { | |
430 | /* Could be optimized better */ | |
431 | while (*nr) { | |
432 | put_page(page); | |
433 | (*nr)--; | |
434 | } | |
435 | } | |
436 | ||
437 | return 1; | |
438 | } | |
439 | ||
39adfa54 DG |
440 | static unsigned long hugepte_addr_end(unsigned long addr, unsigned long end, |
441 | unsigned long sz) | |
442 | { | |
443 | unsigned long __boundary = (addr + sz) & ~(sz-1); | |
444 | return (__boundary - 1 < end - 1) ? __boundary : end; | |
445 | } | |
446 | ||
a4fe3ce7 DG |
447 | int gup_hugepd(hugepd_t *hugepd, unsigned pdshift, |
448 | unsigned long addr, unsigned long end, | |
449 | int write, struct page **pages, int *nr) | |
450 | { | |
451 | pte_t *ptep; | |
452 | unsigned long sz = 1UL << hugepd_shift(*hugepd); | |
39adfa54 | 453 | unsigned long next; |
a4fe3ce7 DG |
454 | |
455 | ptep = hugepte_offset(hugepd, addr, pdshift); | |
456 | do { | |
39adfa54 | 457 | next = hugepte_addr_end(addr, end, sz); |
a4fe3ce7 DG |
458 | if (!gup_hugepte(ptep, sz, addr, end, write, pages, nr)) |
459 | return 0; | |
39adfa54 | 460 | } while (ptep++, addr = next, addr != end); |
a4fe3ce7 DG |
461 | |
462 | return 1; | |
463 | } | |
1da177e4 LT |
464 | |
465 | unsigned long hugetlb_get_unmapped_area(struct file *file, unsigned long addr, | |
466 | unsigned long len, unsigned long pgoff, | |
467 | unsigned long flags) | |
468 | { | |
0d9ea754 JT |
469 | struct hstate *hstate = hstate_file(file); |
470 | int mmu_psize = shift_to_mmu_psize(huge_page_shift(hstate)); | |
48f797de | 471 | |
0d9ea754 | 472 | return slice_get_unmapped_area(addr, len, flags, mmu_psize, 1, 0); |
1da177e4 LT |
473 | } |
474 | ||
3340289d MG |
475 | unsigned long vma_mmu_pagesize(struct vm_area_struct *vma) |
476 | { | |
477 | unsigned int psize = get_slice_psize(vma->vm_mm, vma->vm_start); | |
478 | ||
479 | return 1UL << mmu_psize_to_shift(psize); | |
480 | } | |
481 | ||
d1837cba | 482 | static int __init add_huge_page_size(unsigned long long size) |
4ec161cf | 483 | { |
d1837cba DG |
484 | int shift = __ffs(size); |
485 | int mmu_psize; | |
a4fe3ce7 | 486 | |
4ec161cf | 487 | /* Check that it is a page size supported by the hardware and |
d1837cba DG |
488 | * that it fits within pagetable and slice limits. */ |
489 | if (!is_power_of_2(size) | |
490 | || (shift > SLICE_HIGH_SHIFT) || (shift <= PAGE_SHIFT)) | |
491 | return -EINVAL; | |
91224346 | 492 | |
d1837cba DG |
493 | if ((mmu_psize = shift_to_mmu_psize(shift)) < 0) |
494 | return -EINVAL; | |
495 | ||
496 | #ifdef CONFIG_SPU_FS_64K_LS | |
497 | /* Disable support for 64K huge pages when 64K SPU local store | |
498 | * support is enabled as the current implementation conflicts. | |
499 | */ | |
500 | if (shift == PAGE_SHIFT_64K) | |
501 | return -EINVAL; | |
502 | #endif /* CONFIG_SPU_FS_64K_LS */ | |
503 | ||
504 | BUG_ON(mmu_psize_defs[mmu_psize].shift != shift); | |
505 | ||
506 | /* Return if huge page size has already been setup */ | |
507 | if (size_to_hstate(size)) | |
508 | return 0; | |
509 | ||
510 | hugetlb_add_hstate(shift - PAGE_SHIFT); | |
511 | ||
512 | return 0; | |
4ec161cf JT |
513 | } |
514 | ||
515 | static int __init hugepage_setup_sz(char *str) | |
516 | { | |
517 | unsigned long long size; | |
4ec161cf JT |
518 | |
519 | size = memparse(str, &str); | |
520 | ||
d1837cba | 521 | if (add_huge_page_size(size) != 0) |
4ec161cf JT |
522 | printk(KERN_WARNING "Invalid huge page size specified(%llu)\n", size); |
523 | ||
524 | return 1; | |
525 | } | |
526 | __setup("hugepagesz=", hugepage_setup_sz); | |
527 | ||
f10a04c0 DG |
528 | static int __init hugetlbpage_init(void) |
529 | { | |
a4fe3ce7 | 530 | int psize; |
0d9ea754 | 531 | |
f10a04c0 DG |
532 | if (!cpu_has_feature(CPU_FTR_16M_PAGE)) |
533 | return -ENODEV; | |
00df438e | 534 | |
d1837cba DG |
535 | for (psize = 0; psize < MMU_PAGE_COUNT; ++psize) { |
536 | unsigned shift; | |
537 | unsigned pdshift; | |
0d9ea754 | 538 | |
d1837cba DG |
539 | if (!mmu_psize_defs[psize].shift) |
540 | continue; | |
00df438e | 541 | |
d1837cba DG |
542 | shift = mmu_psize_to_shift(psize); |
543 | ||
544 | if (add_huge_page_size(1ULL << shift) < 0) | |
545 | continue; | |
546 | ||
547 | if (shift < PMD_SHIFT) | |
548 | pdshift = PMD_SHIFT; | |
549 | else if (shift < PUD_SHIFT) | |
550 | pdshift = PUD_SHIFT; | |
551 | else | |
552 | pdshift = PGDIR_SHIFT; | |
553 | ||
554 | pgtable_cache_add(pdshift - shift, NULL); | |
555 | if (!PGT_CACHE(pdshift - shift)) | |
556 | panic("hugetlbpage_init(): could not create " | |
557 | "pgtable cache for %d bit pagesize\n", shift); | |
0d9ea754 | 558 | } |
f10a04c0 | 559 | |
d1837cba DG |
560 | /* Set default large page size. Currently, we pick 16M or 1M |
561 | * depending on what is available | |
562 | */ | |
563 | if (mmu_psize_defs[MMU_PAGE_16M].shift) | |
564 | HPAGE_SHIFT = mmu_psize_defs[MMU_PAGE_16M].shift; | |
565 | else if (mmu_psize_defs[MMU_PAGE_1M].shift) | |
566 | HPAGE_SHIFT = mmu_psize_defs[MMU_PAGE_1M].shift; | |
567 | ||
f10a04c0 DG |
568 | return 0; |
569 | } | |
570 | ||
571 | module_init(hugetlbpage_init); | |
0895ecda DG |
572 | |
573 | void flush_dcache_icache_hugepage(struct page *page) | |
574 | { | |
575 | int i; | |
576 | ||
577 | BUG_ON(!PageCompound(page)); | |
578 | ||
579 | for (i = 0; i < (1UL << compound_order(page)); i++) | |
580 | __flush_dcache_icache(page_address(page+i)); | |
581 | } |