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2024-01-31 f9004dbfff8a3fbbd7e2a88c8a4327c7f2f8e5b2 
 kernel/arch/arm/include/asm/tlb.h
....@@ -1,11 +1,8 @@
1
+/* SPDX-License-Identifier: GPL-2.0-only */
12 /*
23  *  arch/arm/include/asm/tlb.h
34  *
45  *  Copyright (C) 2002 Russell King
5
- *
6
- * This program is free software; you can redistribute it and/or modify
7
- * it under the terms of the GNU General Public License version 2 as
8
- * published by the Free Software Foundation.
96  *
107  *  Experimentation shows that on a StrongARM, it appears to be faster
118  *  to use the "invalidate whole tlb" rather than "invalidate single
....@@ -30,282 +27,41 @@
3027 #else /* !CONFIG_MMU */
3128 
3229 #include <linux/swap.h>
33
-#include <asm/pgalloc.h>
3430 #include <asm/tlbflush.h>
3531 
36
-#define MMU_GATHER_BUNDLE	8
37
-
38
-#ifdef CONFIG_HAVE_RCU_TABLE_FREE
3932 static inline void __tlb_remove_table(void *_table)
4033 {
4134 	free_page_and_swap_cache((struct page *)_table);
4235 }
4336 
44
-struct mmu_table_batch {
45
-	struct rcu_head		rcu;
46
-	unsigned int		nr;
47
-	void			*tables[0];
48
-};
49
-
50
-#define MAX_TABLE_BATCH		\
51
-	((PAGE_SIZE - sizeof(struct mmu_table_batch)) / sizeof(void *))
52
-
53
-extern void tlb_table_flush(struct mmu_gather *tlb);
54
-extern void tlb_remove_table(struct mmu_gather *tlb, void *table);
55
-
56
-#define tlb_remove_entry(tlb, entry)	tlb_remove_table(tlb, entry)
57
-#else
58
-#define tlb_remove_entry(tlb, entry)	tlb_remove_page(tlb, entry)
59
-#endif /* CONFIG_HAVE_RCU_TABLE_FREE */
60
-
61
-/*
62
- * TLB handling.  This allows us to remove pages from the page
63
- * tables, and efficiently handle the TLB issues.
64
- */
65
-struct mmu_gather {
66
-	struct mm_struct	*mm;
67
-#ifdef CONFIG_HAVE_RCU_TABLE_FREE
68
-	struct mmu_table_batch	*batch;
69
-	unsigned int		need_flush;
70
-#endif
71
-	unsigned int		fullmm;
72
-	struct vm_area_struct	*vma;
73
-	unsigned long		start, end;
74
-	unsigned long		range_start;
75
-	unsigned long		range_end;
76
-	unsigned int		nr;
77
-	unsigned int		max;
78
-	struct page		**pages;
79
-	struct page		*local[MMU_GATHER_BUNDLE];
80
-};
81
-
82
-DECLARE_PER_CPU(struct mmu_gather, mmu_gathers);
83
-
84
-/*
85
- * This is unnecessarily complex.  There's three ways the TLB shootdown
86
- * code is used:
87
- *  1. Unmapping a range of vmas.  See zap_page_range(), unmap_region().
88
- *     tlb->fullmm = 0, and tlb_start_vma/tlb_end_vma will be called.
89
- *     tlb->vma will be non-NULL.
90
- *  2. Unmapping all vmas.  See exit_mmap().
91
- *     tlb->fullmm = 1, and tlb_start_vma/tlb_end_vma will be called.
92
- *     tlb->vma will be non-NULL.  Additionally, page tables will be freed.
93
- *  3. Unmapping argument pages.  See shift_arg_pages().
94
- *     tlb->fullmm = 0, but tlb_start_vma/tlb_end_vma will not be called.
95
- *     tlb->vma will be NULL.
96
- */
97
-static inline void tlb_flush(struct mmu_gather *tlb)
98
-{
99
-	if (tlb->fullmm || !tlb->vma)
100
-		flush_tlb_mm(tlb->mm);
101
-	else if (tlb->range_end > 0) {
102
-		flush_tlb_range(tlb->vma, tlb->range_start, tlb->range_end);
103
-		tlb->range_start = TASK_SIZE;
104
-		tlb->range_end = 0;
105
-	}
106
-}
107
-
108
-static inline void tlb_add_flush(struct mmu_gather *tlb, unsigned long addr)
109
-{
110
-	if (!tlb->fullmm) {
111
-		if (addr < tlb->range_start)
112
-			tlb->range_start = addr;
113
-		if (addr + PAGE_SIZE > tlb->range_end)
114
-			tlb->range_end = addr + PAGE_SIZE;
115
-	}
116
-}
117
-
118
-static inline void __tlb_alloc_page(struct mmu_gather *tlb)
119
-{
120
-	unsigned long addr = __get_free_pages(GFP_NOWAIT | __GFP_NOWARN, 0);
121
-
122
-	if (addr) {
123
-		tlb->pages = (void *)addr;
124
-		tlb->max = PAGE_SIZE / sizeof(struct page *);
125
-	}
126
-}
127
-
128
-static inline void tlb_flush_mmu_tlbonly(struct mmu_gather *tlb)
129
-{
130
-	tlb_flush(tlb);
131
-#ifdef CONFIG_HAVE_RCU_TABLE_FREE
132
-	tlb_table_flush(tlb);
133
-#endif
134
-}
135
-
136
-static inline void tlb_flush_mmu_free(struct mmu_gather *tlb)
137
-{
138
-	free_pages_and_swap_cache(tlb->pages, tlb->nr);
139
-	tlb->nr = 0;
140
-	if (tlb->pages == tlb->local)
141
-		__tlb_alloc_page(tlb);
142
-}
143
-
144
-static inline void tlb_flush_mmu(struct mmu_gather *tlb)
145
-{
146
-	tlb_flush_mmu_tlbonly(tlb);
147
-	tlb_flush_mmu_free(tlb);
148
-}
37
+#include <asm-generic/tlb.h>
14938 
15039 static inline void
151
-arch_tlb_gather_mmu(struct mmu_gather *tlb, struct mm_struct *mm,
152
-			unsigned long start, unsigned long end)
40
+__pte_free_tlb(struct mmu_gather *tlb, pgtable_t pte, unsigned long addr)
15341 {
154
-	tlb->mm = mm;
155
-	tlb->fullmm = !(start | (end+1));
156
-	tlb->start = start;
157
-	tlb->end = end;
158
-	tlb->vma = NULL;
159
-	tlb->max = ARRAY_SIZE(tlb->local);
160
-	tlb->pages = tlb->local;
161
-	tlb->nr = 0;
162
-	__tlb_alloc_page(tlb);
42
+	pgtable_pte_page_dtor(pte);
16343 
164
-#ifdef CONFIG_HAVE_RCU_TABLE_FREE
165
-	tlb->batch = NULL;
166
-#endif
167
-}
168
-
169
-static inline void
170
-arch_tlb_finish_mmu(struct mmu_gather *tlb,
171
-			unsigned long start, unsigned long end, bool force)
172
-{
173
-	if (force) {
174
-		tlb->range_start = start;
175
-		tlb->range_end = end;
176
-	}
177
-
178
-	tlb_flush_mmu(tlb);
179
-
180
-	/* keep the page table cache within bounds */
181
-	check_pgt_cache();
182
-
183
-	if (tlb->pages != tlb->local)
184
-		free_pages((unsigned long)tlb->pages, 0);
185
-}
186
-
187
-/*
188
- * Memorize the range for the TLB flush.
189
- */
190
-static inline void
191
-tlb_remove_tlb_entry(struct mmu_gather *tlb, pte_t *ptep, unsigned long addr)
192
-{
193
-	tlb_add_flush(tlb, addr);
194
-}
195
-
196
-#define tlb_remove_huge_tlb_entry(h, tlb, ptep, address)	\
197
-	tlb_remove_tlb_entry(tlb, ptep, address)
198
-/*
199
- * In the case of tlb vma handling, we can optimise these away in the
200
- * case where we're doing a full MM flush.  When we're doing a munmap,
201
- * the vmas are adjusted to only cover the region to be torn down.
202
- */
203
-static inline void
204
-tlb_start_vma(struct mmu_gather *tlb, struct vm_area_struct *vma)
205
-{
206
-	if (!tlb->fullmm) {
207
-		flush_cache_range(vma, vma->vm_start, vma->vm_end);
208
-		tlb->vma = vma;
209
-		tlb->range_start = TASK_SIZE;
210
-		tlb->range_end = 0;
211
-	}
212
-}
213
-
214
-static inline void
215
-tlb_end_vma(struct mmu_gather *tlb, struct vm_area_struct *vma)
216
-{
217
-	if (!tlb->fullmm)
218
-		tlb_flush(tlb);
219
-}
220
-
221
-static inline bool __tlb_remove_page(struct mmu_gather *tlb, struct page *page)
222
-{
223
-	tlb->pages[tlb->nr++] = page;
224
-	VM_WARN_ON(tlb->nr > tlb->max);
225
-	if (tlb->nr == tlb->max)
226
-		return true;
227
-	return false;
228
-}
229
-
230
-static inline void tlb_remove_page(struct mmu_gather *tlb, struct page *page)
231
-{
232
-	if (__tlb_remove_page(tlb, page))
233
-		tlb_flush_mmu(tlb);
234
-}
235
-
236
-static inline bool __tlb_remove_page_size(struct mmu_gather *tlb,
237
-					  struct page *page, int page_size)
238
-{
239
-	return __tlb_remove_page(tlb, page);
240
-}
241
-
242
-static inline void tlb_remove_page_size(struct mmu_gather *tlb,
243
-					struct page *page, int page_size)
244
-{
245
-	return tlb_remove_page(tlb, page);
246
-}
247
-
248
-static inline void __pte_free_tlb(struct mmu_gather *tlb, pgtable_t pte,
249
-	unsigned long addr)
250
-{
251
-	pgtable_page_dtor(pte);
252
-
253
-#ifdef CONFIG_ARM_LPAE
254
-	tlb_add_flush(tlb, addr);
255
-#else
44
+#ifndef CONFIG_ARM_LPAE
25645 	/*
25746 	 * With the classic ARM MMU, a pte page has two corresponding pmd
25847 	 * entries, each covering 1MB.
25948 	 */
260
-	addr &= PMD_MASK;
261
-	tlb_add_flush(tlb, addr + SZ_1M - PAGE_SIZE);
262
-	tlb_add_flush(tlb, addr + SZ_1M);
49
+	addr = (addr & PMD_MASK) + SZ_1M;
50
+	__tlb_adjust_range(tlb, addr - PAGE_SIZE, 2 * PAGE_SIZE);
26351 #endif
26452 
265
-	tlb_remove_entry(tlb, pte);
53
+	tlb_remove_table(tlb, pte);
26654 }
26755 
268
-static inline void __pmd_free_tlb(struct mmu_gather *tlb, pmd_t *pmdp,
269
-				  unsigned long addr)
56
+static inline void
57
+__pmd_free_tlb(struct mmu_gather *tlb, pmd_t *pmdp, unsigned long addr)
27058 {
27159 #ifdef CONFIG_ARM_LPAE
272
-	tlb_add_flush(tlb, addr);
273
-	tlb_remove_entry(tlb, virt_to_page(pmdp));
60
+	struct page *page = virt_to_page(pmdp);
61
+
62
+	pgtable_pmd_page_dtor(page);
63
+	tlb_remove_table(tlb, page);
27464 #endif
275
-}
276
-
277
-static inline void
278
-tlb_remove_pmd_tlb_entry(struct mmu_gather *tlb, pmd_t *pmdp, unsigned long addr)
279
-{
280
-	tlb_add_flush(tlb, addr);
281
-}
282
-
283
-static inline void
284
-tlb_flush_pmd_range(struct mmu_gather *tlb, unsigned long address,
285
-		    unsigned long size)
286
-{
287
-	tlb_add_flush(tlb, address);
288
-	tlb_add_flush(tlb, address + size - PMD_SIZE);
289
-}
290
-
291
-#define pte_free_tlb(tlb, ptep, addr)	__pte_free_tlb(tlb, ptep, addr)
292
-#define pmd_free_tlb(tlb, pmdp, addr)	__pmd_free_tlb(tlb, pmdp, addr)
293
-#define pud_free_tlb(tlb, pudp, addr)	pud_free((tlb)->mm, pudp)
294
-
295
-#define tlb_migrate_finish(mm)		do { } while (0)
296
-
297
-#define tlb_remove_check_page_size_change tlb_remove_check_page_size_change
298
-static inline void tlb_remove_check_page_size_change(struct mmu_gather *tlb,
299
-						     unsigned int page_size)
300
-{
301
-}
302
-
303
-static inline void tlb_flush_remove_tables(struct mm_struct *mm)
304
-{
305
-}
306
-
307
-static inline void tlb_flush_remove_tables_local(void *arg)
308
-{
30965 }
31066 
31167 #endif /* CONFIG_MMU */