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3df33f12 AK |
1 | /* |
2 | * Copyright 2015-2016, Aneesh Kumar K.V, IBM Corporation. | |
3 | * | |
4 | * This program is free software; you can redistribute it and/or | |
5 | * modify it under the terms of the GNU General Public License | |
6 | * as published by the Free Software Foundation; either version | |
7 | * 2 of the License, or (at your option) any later version. | |
8 | */ | |
9 | ||
10 | #include <linux/sched.h> | |
589ee628 | 11 | #include <linux/mm_types.h> |
59879d54 | 12 | #include <linux/memblock.h> |
fa4531f7 | 13 | #include <misc/cxl-base.h> |
589ee628 | 14 | |
3df33f12 AK |
15 | #include <asm/pgalloc.h> |
16 | #include <asm/tlb.h> | |
59879d54 AK |
17 | #include <asm/trace.h> |
18 | #include <asm/powernv.h> | |
3df33f12 | 19 | |
9d9f2ccc | 20 | #include <mm/mmu_decl.h> |
3df33f12 AK |
21 | #include <trace/events/thp.h> |
22 | ||
8a6c697b AK |
23 | unsigned long __pmd_frag_nr; |
24 | EXPORT_SYMBOL(__pmd_frag_nr); | |
25 | unsigned long __pmd_frag_size_shift; | |
26 | EXPORT_SYMBOL(__pmd_frag_size_shift); | |
27 | ||
eea8148c ME |
28 | int (*register_process_table)(unsigned long base, unsigned long page_size, |
29 | unsigned long tbl_size); | |
30 | ||
3df33f12 AK |
31 | #ifdef CONFIG_TRANSPARENT_HUGEPAGE |
32 | /* | |
33 | * This is called when relaxing access to a hugepage. It's also called in the page | |
34 | * fault path when we don't hit any of the major fault cases, ie, a minor | |
35 | * update of _PAGE_ACCESSED, _PAGE_DIRTY, etc... The generic code will have | |
36 | * handled those two for us, we additionally deal with missing execute | |
37 | * permission here on some processors | |
38 | */ | |
39 | int pmdp_set_access_flags(struct vm_area_struct *vma, unsigned long address, | |
40 | pmd_t *pmdp, pmd_t entry, int dirty) | |
41 | { | |
42 | int changed; | |
43 | #ifdef CONFIG_DEBUG_VM | |
ebd31197 | 44 | WARN_ON(!pmd_trans_huge(*pmdp) && !pmd_devmap(*pmdp)); |
af60a4cf | 45 | assert_spin_locked(pmd_lockptr(vma->vm_mm, pmdp)); |
3df33f12 AK |
46 | #endif |
47 | changed = !pmd_same(*(pmdp), entry); | |
48 | if (changed) { | |
e4c1112c AK |
49 | /* |
50 | * We can use MMU_PAGE_2M here, because only radix | |
51 | * path look at the psize. | |
52 | */ | |
53 | __ptep_set_access_flags(vma, pmdp_ptep(pmdp), | |
54 | pmd_pte(entry), address, MMU_PAGE_2M); | |
3df33f12 AK |
55 | } |
56 | return changed; | |
57 | } | |
58 | ||
59 | int pmdp_test_and_clear_young(struct vm_area_struct *vma, | |
60 | unsigned long address, pmd_t *pmdp) | |
61 | { | |
62 | return __pmdp_test_and_clear_young(vma->vm_mm, address, pmdp); | |
63 | } | |
64 | /* | |
65 | * set a new huge pmd. We should not be called for updating | |
66 | * an existing pmd entry. That should go via pmd_hugepage_update. | |
67 | */ | |
68 | void set_pmd_at(struct mm_struct *mm, unsigned long addr, | |
69 | pmd_t *pmdp, pmd_t pmd) | |
70 | { | |
71 | #ifdef CONFIG_DEBUG_VM | |
da7ad366 AK |
72 | /* |
73 | * Make sure hardware valid bit is not set. We don't do | |
74 | * tlb flush for this update. | |
75 | */ | |
dd0e144a AK |
76 | |
77 | WARN_ON(pte_hw_valid(pmd_pte(*pmdp)) && !pte_protnone(pmd_pte(*pmdp))); | |
af60a4cf | 78 | assert_spin_locked(pmd_lockptr(mm, pmdp)); |
ae28f17b | 79 | WARN_ON(!(pmd_large(pmd) || pmd_devmap(pmd))); |
3df33f12 AK |
80 | #endif |
81 | trace_hugepage_set_pmd(addr, pmd_val(pmd)); | |
82 | return set_pte_at(mm, addr, pmdp_ptep(pmdp), pmd_pte(pmd)); | |
83 | } | |
fa4531f7 AK |
84 | |
85 | static void do_nothing(void *unused) | |
86 | { | |
87 | ||
88 | } | |
89 | /* | |
90 | * Serialize against find_current_mm_pte which does lock-less | |
91 | * lookup in page tables with local interrupts disabled. For huge pages | |
92 | * it casts pmd_t to pte_t. Since format of pte_t is different from | |
93 | * pmd_t we want to prevent transit from pmd pointing to page table | |
94 | * to pmd pointing to huge page (and back) while interrupts are disabled. | |
95 | * We clear pmd to possibly replace it with page table pointer in | |
96 | * different code paths. So make sure we wait for the parallel | |
97 | * find_current_mm_pte to finish. | |
98 | */ | |
99 | void serialize_against_pte_lookup(struct mm_struct *mm) | |
100 | { | |
101 | smp_mb(); | |
0f4bc093 | 102 | smp_call_function_many(mm_cpumask(mm), do_nothing, NULL, 1); |
fa4531f7 AK |
103 | } |
104 | ||
3df33f12 AK |
105 | /* |
106 | * We use this to invalidate a pmdp entry before switching from a | |
107 | * hugepte to regular pmd entry. | |
108 | */ | |
8cc931e0 | 109 | pmd_t pmdp_invalidate(struct vm_area_struct *vma, unsigned long address, |
3df33f12 AK |
110 | pmd_t *pmdp) |
111 | { | |
8cc931e0 AK |
112 | unsigned long old_pmd; |
113 | ||
da7ad366 | 114 | old_pmd = pmd_hugepage_update(vma->vm_mm, address, pmdp, _PAGE_PRESENT, _PAGE_INVALID); |
d8e91e93 | 115 | flush_pmd_tlb_range(vma, address, address + HPAGE_PMD_SIZE); |
3df33f12 AK |
116 | /* |
117 | * This ensures that generic code that rely on IRQ disabling | |
118 | * to prevent a parallel THP split work as expected. | |
119 | */ | |
fa4531f7 | 120 | serialize_against_pte_lookup(vma->vm_mm); |
8cc931e0 | 121 | return __pmd(old_pmd); |
3df33f12 AK |
122 | } |
123 | ||
124 | static pmd_t pmd_set_protbits(pmd_t pmd, pgprot_t pgprot) | |
125 | { | |
126 | return __pmd(pmd_val(pmd) | pgprot_val(pgprot)); | |
127 | } | |
128 | ||
129 | pmd_t pfn_pmd(unsigned long pfn, pgprot_t pgprot) | |
130 | { | |
131 | unsigned long pmdv; | |
132 | ||
133 | pmdv = (pfn << PAGE_SHIFT) & PTE_RPN_MASK; | |
134 | return pmd_set_protbits(__pmd(pmdv), pgprot); | |
135 | } | |
136 | ||
137 | pmd_t mk_pmd(struct page *page, pgprot_t pgprot) | |
138 | { | |
139 | return pfn_pmd(page_to_pfn(page), pgprot); | |
140 | } | |
141 | ||
142 | pmd_t pmd_modify(pmd_t pmd, pgprot_t newprot) | |
143 | { | |
144 | unsigned long pmdv; | |
145 | ||
146 | pmdv = pmd_val(pmd); | |
147 | pmdv &= _HPAGE_CHG_MASK; | |
148 | return pmd_set_protbits(__pmd(pmdv), newprot); | |
149 | } | |
150 | ||
151 | /* | |
152 | * This is called at the end of handling a user page fault, when the | |
153 | * fault has been handled by updating a HUGE PMD entry in the linux page tables. | |
154 | * We use it to preload an HPTE into the hash table corresponding to | |
155 | * the updated linux HUGE PMD entry. | |
156 | */ | |
157 | void update_mmu_cache_pmd(struct vm_area_struct *vma, unsigned long addr, | |
158 | pmd_t *pmd) | |
159 | { | |
68662f85 NP |
160 | if (radix_enabled()) |
161 | prefetch((void *)addr); | |
3df33f12 AK |
162 | } |
163 | #endif /* CONFIG_TRANSPARENT_HUGEPAGE */ | |
fe036a06 BH |
164 | |
165 | /* For use by kexec */ | |
166 | void mmu_cleanup_all(void) | |
167 | { | |
168 | if (radix_enabled()) | |
169 | radix__mmu_cleanup_all(); | |
170 | else if (mmu_hash_ops.hpte_clear_all) | |
171 | mmu_hash_ops.hpte_clear_all(); | |
172 | } | |
32b53c01 RA |
173 | |
174 | #ifdef CONFIG_MEMORY_HOTPLUG | |
f437c517 | 175 | int __meminit create_section_mapping(unsigned long start, unsigned long end, int nid) |
32b53c01 RA |
176 | { |
177 | if (radix_enabled()) | |
29ab6c47 | 178 | return radix__create_section_mapping(start, end, nid); |
32b53c01 | 179 | |
29ab6c47 | 180 | return hash__create_section_mapping(start, end, nid); |
32b53c01 RA |
181 | } |
182 | ||
bde709a7 | 183 | int __meminit remove_section_mapping(unsigned long start, unsigned long end) |
32b53c01 RA |
184 | { |
185 | if (radix_enabled()) | |
4b5d62ca | 186 | return radix__remove_section_mapping(start, end); |
32b53c01 RA |
187 | |
188 | return hash__remove_section_mapping(start, end); | |
189 | } | |
190 | #endif /* CONFIG_MEMORY_HOTPLUG */ | |
59879d54 AK |
191 | |
192 | void __init mmu_partition_table_init(void) | |
193 | { | |
194 | unsigned long patb_size = 1UL << PATB_SIZE_SHIFT; | |
195 | unsigned long ptcr; | |
196 | ||
197 | BUILD_BUG_ON_MSG((PATB_SIZE_SHIFT > 36), "Partition table size too large."); | |
59879d54 | 198 | /* Initialize the Partition Table with no entries */ |
f806714f | 199 | partition_tb = memblock_alloc(patb_size, patb_size); |
8a7f97b9 MR |
200 | if (!partition_tb) |
201 | panic("%s: Failed to allocate %lu bytes align=0x%lx\n", | |
202 | __func__, patb_size, patb_size); | |
59879d54 AK |
203 | |
204 | /* | |
205 | * update partition table control register, | |
206 | * 64 K size. | |
207 | */ | |
208 | ptcr = __pa(partition_tb) | (PATB_SIZE_SHIFT - 12); | |
209 | mtspr(SPRN_PTCR, ptcr); | |
210 | powernv_set_nmmu_ptcr(ptcr); | |
211 | } | |
212 | ||
213 | void mmu_partition_table_set_entry(unsigned int lpid, unsigned long dw0, | |
214 | unsigned long dw1) | |
215 | { | |
216 | unsigned long old = be64_to_cpu(partition_tb[lpid].patb0); | |
217 | ||
218 | partition_tb[lpid].patb0 = cpu_to_be64(dw0); | |
219 | partition_tb[lpid].patb1 = cpu_to_be64(dw1); | |
220 | ||
221 | /* | |
222 | * Global flush of TLBs and partition table caches for this lpid. | |
223 | * The type of flush (hash or radix) depends on what the previous | |
224 | * use of this partition ID was, not the new use. | |
225 | */ | |
226 | asm volatile("ptesync" : : : "memory"); | |
227 | if (old & PATB_HR) { | |
228 | asm volatile(PPC_TLBIE_5(%0,%1,2,0,1) : : | |
229 | "r" (TLBIEL_INVAL_SET_LPID), "r" (lpid)); | |
230 | asm volatile(PPC_TLBIE_5(%0,%1,2,1,1) : : | |
231 | "r" (TLBIEL_INVAL_SET_LPID), "r" (lpid)); | |
232 | trace_tlbie(lpid, 0, TLBIEL_INVAL_SET_LPID, lpid, 2, 0, 1); | |
233 | } else { | |
234 | asm volatile(PPC_TLBIE_5(%0,%1,2,0,0) : : | |
235 | "r" (TLBIEL_INVAL_SET_LPID), "r" (lpid)); | |
236 | trace_tlbie(lpid, 0, TLBIEL_INVAL_SET_LPID, lpid, 2, 0, 0); | |
237 | } | |
238 | /* do we need fixup here ?*/ | |
239 | asm volatile("eieio; tlbsync; ptesync" : : : "memory"); | |
240 | } | |
241 | EXPORT_SYMBOL_GPL(mmu_partition_table_set_entry); | |
1c7ec8a4 | 242 | |
8a6c697b AK |
243 | static pmd_t *get_pmd_from_cache(struct mm_struct *mm) |
244 | { | |
245 | void *pmd_frag, *ret; | |
246 | ||
2a146533 CL |
247 | if (PMD_FRAG_NR == 1) |
248 | return NULL; | |
249 | ||
8a6c697b AK |
250 | spin_lock(&mm->page_table_lock); |
251 | ret = mm->context.pmd_frag; | |
252 | if (ret) { | |
253 | pmd_frag = ret + PMD_FRAG_SIZE; | |
254 | /* | |
255 | * If we have taken up all the fragments mark PTE page NULL | |
256 | */ | |
257 | if (((unsigned long)pmd_frag & ~PAGE_MASK) == 0) | |
258 | pmd_frag = NULL; | |
259 | mm->context.pmd_frag = pmd_frag; | |
260 | } | |
261 | spin_unlock(&mm->page_table_lock); | |
262 | return (pmd_t *)ret; | |
263 | } | |
264 | ||
265 | static pmd_t *__alloc_for_pmdcache(struct mm_struct *mm) | |
266 | { | |
267 | void *ret = NULL; | |
268 | struct page *page; | |
269 | gfp_t gfp = GFP_KERNEL_ACCOUNT | __GFP_ZERO; | |
270 | ||
271 | if (mm == &init_mm) | |
272 | gfp &= ~__GFP_ACCOUNT; | |
273 | page = alloc_page(gfp); | |
274 | if (!page) | |
275 | return NULL; | |
276 | if (!pgtable_pmd_page_ctor(page)) { | |
277 | __free_pages(page, 0); | |
278 | return NULL; | |
279 | } | |
280 | ||
4231aba0 NP |
281 | atomic_set(&page->pt_frag_refcount, 1); |
282 | ||
8a6c697b AK |
283 | ret = page_address(page); |
284 | /* | |
285 | * if we support only one fragment just return the | |
286 | * allocated page. | |
287 | */ | |
288 | if (PMD_FRAG_NR == 1) | |
289 | return ret; | |
290 | ||
291 | spin_lock(&mm->page_table_lock); | |
292 | /* | |
293 | * If we find pgtable_page set, we return | |
294 | * the allocated page with single fragement | |
295 | * count. | |
296 | */ | |
297 | if (likely(!mm->context.pmd_frag)) { | |
4231aba0 | 298 | atomic_set(&page->pt_frag_refcount, PMD_FRAG_NR); |
8a6c697b AK |
299 | mm->context.pmd_frag = ret + PMD_FRAG_SIZE; |
300 | } | |
301 | spin_unlock(&mm->page_table_lock); | |
302 | ||
303 | return (pmd_t *)ret; | |
304 | } | |
305 | ||
306 | pmd_t *pmd_fragment_alloc(struct mm_struct *mm, unsigned long vmaddr) | |
307 | { | |
308 | pmd_t *pmd; | |
309 | ||
310 | pmd = get_pmd_from_cache(mm); | |
311 | if (pmd) | |
312 | return pmd; | |
313 | ||
314 | return __alloc_for_pmdcache(mm); | |
315 | } | |
316 | ||
317 | void pmd_fragment_free(unsigned long *pmd) | |
318 | { | |
319 | struct page *page = virt_to_page(pmd); | |
320 | ||
4231aba0 NP |
321 | BUG_ON(atomic_read(&page->pt_frag_refcount) <= 0); |
322 | if (atomic_dec_and_test(&page->pt_frag_refcount)) { | |
8a6c697b | 323 | pgtable_pmd_page_dtor(page); |
4231aba0 | 324 | __free_page(page); |
8a6c697b AK |
325 | } |
326 | } | |
327 | ||
0c4d2680 AK |
328 | static inline void pgtable_free(void *table, int index) |
329 | { | |
330 | switch (index) { | |
331 | case PTE_INDEX: | |
332 | pte_fragment_free(table, 0); | |
333 | break; | |
334 | case PMD_INDEX: | |
738f9645 | 335 | pmd_fragment_free(table); |
0c4d2680 AK |
336 | break; |
337 | case PUD_INDEX: | |
338 | kmem_cache_free(PGT_CACHE(PUD_CACHE_INDEX), table); | |
339 | break; | |
fadd03c6 AK |
340 | #if defined(CONFIG_PPC_4K_PAGES) && defined(CONFIG_HUGETLB_PAGE) |
341 | /* 16M hugepd directory at pud level */ | |
342 | case HTLB_16M_INDEX: | |
343 | BUILD_BUG_ON(H_16M_CACHE_INDEX <= 0); | |
344 | kmem_cache_free(PGT_CACHE(H_16M_CACHE_INDEX), table); | |
345 | break; | |
346 | /* 16G hugepd directory at the pgd level */ | |
347 | case HTLB_16G_INDEX: | |
348 | BUILD_BUG_ON(H_16G_CACHE_INDEX <= 0); | |
349 | kmem_cache_free(PGT_CACHE(H_16G_CACHE_INDEX), table); | |
350 | break; | |
351 | #endif | |
0c4d2680 AK |
352 | /* We don't free pgd table via RCU callback */ |
353 | default: | |
354 | BUG(); | |
355 | } | |
356 | } | |
357 | ||
70234676 | 358 | #ifdef CONFIG_SMP |
0c4d2680 | 359 | void pgtable_free_tlb(struct mmu_gather *tlb, void *table, int index) |
70234676 AK |
360 | { |
361 | unsigned long pgf = (unsigned long)table; | |
362 | ||
0c4d2680 AK |
363 | BUG_ON(index > MAX_PGTABLE_INDEX_SIZE); |
364 | pgf |= index; | |
70234676 AK |
365 | tlb_remove_table(tlb, (void *)pgf); |
366 | } | |
367 | ||
368 | void __tlb_remove_table(void *_table) | |
369 | { | |
370 | void *table = (void *)((unsigned long)_table & ~MAX_PGTABLE_INDEX_SIZE); | |
0c4d2680 | 371 | unsigned int index = (unsigned long)_table & MAX_PGTABLE_INDEX_SIZE; |
70234676 | 372 | |
0c4d2680 | 373 | return pgtable_free(table, index); |
70234676 AK |
374 | } |
375 | #else | |
0c4d2680 | 376 | void pgtable_free_tlb(struct mmu_gather *tlb, void *table, int index) |
70234676 | 377 | { |
0c4d2680 | 378 | return pgtable_free(table, index); |
70234676 AK |
379 | } |
380 | #endif | |
a2dc009a AK |
381 | |
382 | #ifdef CONFIG_PROC_FS | |
383 | atomic_long_t direct_pages_count[MMU_PAGE_COUNT]; | |
384 | ||
385 | void arch_report_meminfo(struct seq_file *m) | |
386 | { | |
387 | /* | |
388 | * Hash maps the memory with one size mmu_linear_psize. | |
389 | * So don't bother to print these on hash | |
390 | */ | |
391 | if (!radix_enabled()) | |
392 | return; | |
393 | seq_printf(m, "DirectMap4k: %8lu kB\n", | |
394 | atomic_long_read(&direct_pages_count[MMU_PAGE_4K]) << 2); | |
395 | seq_printf(m, "DirectMap64k: %8lu kB\n", | |
396 | atomic_long_read(&direct_pages_count[MMU_PAGE_64K]) << 6); | |
397 | seq_printf(m, "DirectMap2M: %8lu kB\n", | |
398 | atomic_long_read(&direct_pages_count[MMU_PAGE_2M]) << 11); | |
399 | seq_printf(m, "DirectMap1G: %8lu kB\n", | |
400 | atomic_long_read(&direct_pages_count[MMU_PAGE_1G]) << 20); | |
401 | } | |
402 | #endif /* CONFIG_PROC_FS */ | |
579b9239 | 403 | |
5b323367 AK |
404 | pte_t ptep_modify_prot_start(struct vm_area_struct *vma, unsigned long addr, |
405 | pte_t *ptep) | |
406 | { | |
407 | unsigned long pte_val; | |
408 | ||
409 | /* | |
410 | * Clear the _PAGE_PRESENT so that no hardware parallel update is | |
411 | * possible. Also keep the pte_present true so that we don't take | |
412 | * wrong fault. | |
413 | */ | |
414 | pte_val = pte_update(vma->vm_mm, addr, ptep, _PAGE_PRESENT, _PAGE_INVALID, 0); | |
415 | ||
416 | return __pte(pte_val); | |
417 | ||
418 | } | |
419 | ||
420 | void ptep_modify_prot_commit(struct vm_area_struct *vma, unsigned long addr, | |
421 | pte_t *ptep, pte_t old_pte, pte_t pte) | |
422 | { | |
423 | if (radix_enabled()) | |
424 | return radix__ptep_modify_prot_commit(vma, addr, | |
425 | ptep, old_pte, pte); | |
426 | set_pte_at(vma->vm_mm, addr, ptep, pte); | |
427 | } | |
428 | ||
579b9239 AK |
429 | /* |
430 | * For hash translation mode, we use the deposited table to store hash slot | |
431 | * information and they are stored at PTRS_PER_PMD offset from related pmd | |
432 | * location. Hence a pmd move requires deposit and withdraw. | |
433 | * | |
434 | * For radix translation with split pmd ptl, we store the deposited table in the | |
435 | * pmd page. Hence if we have different pmd page we need to withdraw during pmd | |
436 | * move. | |
437 | * | |
438 | * With hash we use deposited table always irrespective of anon or not. | |
439 | * With radix we use deposited table only for anonymous mapping. | |
440 | */ | |
441 | int pmd_move_must_withdraw(struct spinlock *new_pmd_ptl, | |
442 | struct spinlock *old_pmd_ptl, | |
443 | struct vm_area_struct *vma) | |
444 | { | |
445 | if (radix_enabled()) | |
446 | return (new_pmd_ptl != old_pmd_ptl) && vma_is_anonymous(vma); | |
447 | ||
448 | return true; | |
449 | } |