summaryrefslogtreecommitdiff
path: root/arch/riscv/mm/hugetlbpage.c
blob: a163a3e0f0d46b92565e85318c105b9cf0891c29 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
// SPDX-License-Identifier: GPL-2.0
#include <linux/hugetlb.h>
#include <linux/err.h>

#ifdef CONFIG_RISCV_ISA_SVNAPOT
pte_t *huge_pte_alloc(struct mm_struct *mm,
		      struct vm_area_struct *vma,
		      unsigned long addr,
		      unsigned long sz)
{
	unsigned long order;
	pte_t *pte = NULL;
	pgd_t *pgd;
	p4d_t *p4d;
	pud_t *pud;
	pmd_t *pmd;

	pgd = pgd_offset(mm, addr);
	p4d = p4d_alloc(mm, pgd, addr);
	if (!p4d)
		return NULL;

	pud = pud_alloc(mm, p4d, addr);
	if (!pud)
		return NULL;

	if (sz == PUD_SIZE) {
		pte = (pte_t *)pud;
		goto out;
	}

	if (sz == PMD_SIZE) {
		if (want_pmd_share(vma, addr) && pud_none(*pud))
			pte = huge_pmd_share(mm, vma, addr, pud);
		else
			pte = (pte_t *)pmd_alloc(mm, pud, addr);
		goto out;
	}

	pmd = pmd_alloc(mm, pud, addr);
	if (!pmd)
		return NULL;

	for_each_napot_order(order) {
		if (napot_cont_size(order) == sz) {
			pte = pte_alloc_map(mm, pmd, addr & napot_cont_mask(order));
			break;
		}
	}

out:
	WARN_ON_ONCE(pte && pte_present(*pte) && !pte_huge(*pte));
	return pte;
}

pte_t *huge_pte_offset(struct mm_struct *mm,
		       unsigned long addr,
		       unsigned long sz)
{
	unsigned long order;
	pte_t *pte = NULL;
	pgd_t *pgd;
	p4d_t *p4d;
	pud_t *pud;
	pmd_t *pmd;

	pgd = pgd_offset(mm, addr);
	if (!pgd_present(*pgd))
		return NULL;

	p4d = p4d_offset(pgd, addr);
	if (!p4d_present(*p4d))
		return NULL;

	pud = pud_offset(p4d, addr);
	if (sz == PUD_SIZE)
		/* must be pud huge, non-present or none */
		return (pte_t *)pud;

	if (!pud_present(*pud))
		return NULL;

	pmd = pmd_offset(pud, addr);
	if (sz == PMD_SIZE)
		/* must be pmd huge, non-present or none */
		return (pte_t *)pmd;

	if (!pmd_present(*pmd))
		return NULL;

	for_each_napot_order(order) {
		if (napot_cont_size(order) == sz) {
			pte = pte_offset_kernel(pmd, addr & napot_cont_mask(order));
			break;
		}
	}
	return pte;
}

static pte_t get_clear_contig(struct mm_struct *mm,
			      unsigned long addr,
			      pte_t *ptep,
			      unsigned long pte_num)
{
	pte_t orig_pte = ptep_get(ptep);
	unsigned long i;

	for (i = 0; i < pte_num; i++, addr += PAGE_SIZE, ptep++) {
		pte_t pte = ptep_get_and_clear(mm, addr, ptep);

		if (pte_dirty(pte))
			orig_pte = pte_mkdirty(orig_pte);

		if (pte_young(pte))
			orig_pte = pte_mkyoung(orig_pte);
	}

	return orig_pte;
}

static pte_t get_clear_contig_flush(struct mm_struct *mm,
				    unsigned long addr,
				    pte_t *ptep,
				    unsigned long pte_num)
{
	pte_t orig_pte = get_clear_contig(mm, addr, ptep, pte_num);
	struct vm_area_struct vma = TLB_FLUSH_VMA(mm, 0);
	bool valid = !pte_none(orig_pte);

	if (valid)
		flush_tlb_range(&vma, addr, addr + (PAGE_SIZE * pte_num));

	return orig_pte;
}

pte_t arch_make_huge_pte(pte_t entry, unsigned int shift, vm_flags_t flags)
{
	unsigned long order;

	for_each_napot_order(order) {
		if (shift == napot_cont_shift(order)) {
			entry = pte_mknapot(entry, order);
			break;
		}
	}
	if (order == NAPOT_ORDER_MAX)
		entry = pte_mkhuge(entry);

	return entry;
}

void set_huge_pte_at(struct mm_struct *mm,
		     unsigned long addr,
		     pte_t *ptep,
		     pte_t pte)
{
	int i, pte_num;

	if (!pte_napot(pte)) {
		set_pte_at(mm, addr, ptep, pte);
		return;
	}

	pte_num = napot_pte_num(napot_cont_order(pte));
	for (i = 0; i < pte_num; i++, ptep++, addr += PAGE_SIZE)
		set_pte_at(mm, addr, ptep, pte);
}

int huge_ptep_set_access_flags(struct vm_area_struct *vma,
			       unsigned long addr,
			       pte_t *ptep,
			       pte_t pte,
			       int dirty)
{
	struct mm_struct *mm = vma->vm_mm;
	unsigned long order;
	pte_t orig_pte;
	int i, pte_num;

	if (!pte_napot(pte))
		return ptep_set_access_flags(vma, addr, ptep, pte, dirty);

	order = napot_cont_order(pte);
	pte_num = napot_pte_num(order);
	ptep = huge_pte_offset(mm, addr, napot_cont_size(order));
	orig_pte = get_clear_contig_flush(mm, addr, ptep, pte_num);

	if (pte_dirty(orig_pte))
		pte = pte_mkdirty(pte);

	if (pte_young(orig_pte))
		pte = pte_mkyoung(pte);

	for (i = 0; i < pte_num; i++, addr += PAGE_SIZE, ptep++)
		set_pte_at(mm, addr, ptep, pte);

	return true;
}

pte_t huge_ptep_get_and_clear(struct mm_struct *mm,
			      unsigned long addr,
			      pte_t *ptep)
{
	pte_t orig_pte = ptep_get(ptep);
	int pte_num;

	if (!pte_napot(orig_pte))
		return ptep_get_and_clear(mm, addr, ptep);

	pte_num = napot_pte_num(napot_cont_order(orig_pte));

	return get_clear_contig(mm, addr, ptep, pte_num);
}

void huge_ptep_set_wrprotect(struct mm_struct *mm,
			     unsigned long addr,
			     pte_t *ptep)
{
	pte_t pte = ptep_get(ptep);
	unsigned long order;
	int i, pte_num;

	if (!pte_napot(pte)) {
		ptep_set_wrprotect(mm, addr, ptep);
		return;
	}

	order = napot_cont_order(pte);
	pte_num = napot_pte_num(order);
	ptep = huge_pte_offset(mm, addr, napot_cont_size(order));

	for (i = 0; i < pte_num; i++, addr += PAGE_SIZE, ptep++)
		ptep_set_wrprotect(mm, addr, ptep);
}

pte_t huge_ptep_clear_flush(struct vm_area_struct *vma,
			    unsigned long addr,
			    pte_t *ptep)
{
	pte_t pte = ptep_get(ptep);
	int pte_num;

	if (!pte_napot(pte))
		return ptep_clear_flush(vma, addr, ptep);

	pte_num = napot_pte_num(napot_cont_order(pte));

	return get_clear_contig_flush(vma->vm_mm, addr, ptep, pte_num);
}

void huge_pte_clear(struct mm_struct *mm,
		    unsigned long addr,
		    pte_t *ptep,
		    unsigned long sz)
{
	pte_t pte = READ_ONCE(*ptep);
	int i, pte_num;

	if (!pte_napot(pte)) {
		pte_clear(mm, addr, ptep);
		return;
	}

	pte_num = napot_pte_num(napot_cont_order(pte));
	for (i = 0; i < pte_num; i++, addr += PAGE_SIZE, ptep++)
		pte_clear(mm, addr, ptep);
}

static __init bool is_napot_size(unsigned long size)
{
	unsigned long order;

	if (!has_svnapot())
		return false;

	for_each_napot_order(order) {
		if (size == napot_cont_size(order))
			return true;
	}
	return false;
}

static __init int napot_hugetlbpages_init(void)
{
	if (has_svnapot()) {
		unsigned long order;

		for_each_napot_order(order)
			hugetlb_add_hstate(order);
	}
	return 0;
}
arch_initcall(napot_hugetlbpages_init);

#else

static __init bool is_napot_size(unsigned long size)
{
	return false;
}

#endif /*CONFIG_RISCV_ISA_SVNAPOT*/

int pud_huge(pud_t pud)
{
	return pud_leaf(pud);
}

int pmd_huge(pmd_t pmd)
{
	return pmd_leaf(pmd);
}

bool __init arch_hugetlb_valid_size(unsigned long size)
{
	if (size == HPAGE_SIZE)
		return true;
	else if (IS_ENABLED(CONFIG_64BIT) && size == PUD_SIZE)
		return true;
	else if (is_napot_size(size))
		return true;
	else
		return false;
}

#ifdef CONFIG_CONTIG_ALLOC
static __init int gigantic_pages_init(void)
{
	/* With CONTIG_ALLOC, we can allocate gigantic pages at runtime */
	if (IS_ENABLED(CONFIG_64BIT))
		hugetlb_add_hstate(PUD_SHIFT - PAGE_SHIFT);
	return 0;
}
arch_initcall(gigantic_pages_init);
#endif