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2024-05-10 093a6c67005148ae32a5c9e4553491b9f5c2457b 
 kernel/include/linux/migrate.h
....@@ -10,6 +10,8 @@
1010 typedef struct page *new_page_t(struct page *page, unsigned long private);
1111 typedef void free_page_t(struct page *page, unsigned long private);
1212 
13
+struct migration_target_control;
14
+
1315 /*
1416  * Return values from addresss_space_operations.migratepage():
1517  * - negative errno on page migration failure;
....@@ -29,35 +31,7 @@
2931 };
3032 
3133 /* In mm/debug.c; also keep sync with include/trace/events/migrate.h */
32
-extern char *migrate_reason_names[MR_TYPES];
33
-
34
-static inline struct page *new_page_nodemask(struct page *page,
35
-				int preferred_nid, nodemask_t *nodemask)
36
-{
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-	gfp_t gfp_mask = GFP_USER | __GFP_MOVABLE | __GFP_RETRY_MAYFAIL;
38
-	unsigned int order = 0;
39
-	struct page *new_page = NULL;
40
-
41
-	if (PageHuge(page))
42
-		return alloc_huge_page_nodemask(page_hstate(compound_head(page)),
43
-				preferred_nid, nodemask);
44
-
45
-	if (PageTransHuge(page)) {
46
-		gfp_mask |= GFP_TRANSHUGE;
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-		order = HPAGE_PMD_ORDER;
48
-	}
49
-
50
-	if (PageHighMem(page) || (zone_idx(page_zone(page)) == ZONE_MOVABLE))
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-		gfp_mask |= __GFP_HIGHMEM;
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-
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-	new_page = __alloc_pages_nodemask(gfp_mask, order,
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-				preferred_nid, nodemask);
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-
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-	if (new_page && PageTransHuge(new_page))
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-		prep_transhuge_page(new_page);
58
-
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-	return new_page;
60
-}
34
+extern const char *migrate_reason_names[MR_TYPES];
6135 
6236 #ifdef CONFIG_MIGRATION
6337 
....@@ -67,19 +41,16 @@
6741 			enum migrate_mode mode);
6842 extern int migrate_pages(struct list_head *l, new_page_t new, free_page_t free,
6943 		unsigned long private, enum migrate_mode mode, int reason);
44
+extern struct page *alloc_migration_target(struct page *page, unsigned long private);
7045 extern int isolate_movable_page(struct page *page, isolate_mode_t mode);
7146 extern void putback_movable_page(struct page *page);
7247 
73
-extern int migrate_prep(void);
74
-extern int migrate_prep_local(void);
7548 extern void migrate_page_states(struct page *newpage, struct page *page);
7649 extern void migrate_page_copy(struct page *newpage, struct page *page);
7750 extern int migrate_huge_page_move_mapping(struct address_space *mapping,
7851 				  struct page *newpage, struct page *page);
7952 extern int migrate_page_move_mapping(struct address_space *mapping,
80
-		struct page *newpage, struct page *page,
81
-		struct buffer_head *head, enum migrate_mode mode,
82
-		int extra_count);
53
+		struct page *newpage, struct page *page, int extra_count);
8354 #else
8455 
8556 static inline void putback_movable_pages(struct list_head *l) {}
....@@ -87,11 +58,11 @@
8758 		free_page_t free, unsigned long private, enum migrate_mode mode,
8859 		int reason)
8960 	{ return -ENOSYS; }
61
+static inline struct page *alloc_migration_target(struct page *page,
62
+		unsigned long private)
63
+	{ return NULL; }
9064 static inline int isolate_movable_page(struct page *page, isolate_mode_t mode)
9165 	{ return -EBUSY; }
92
-
93
-static inline int migrate_prep(void) { return -ENOSYS; }
94
-static inline int migrate_prep_local(void) { return -ENOSYS; }
9566 
9667 static inline void migrate_page_states(struct page *newpage, struct page *page)
9768 {
....@@ -126,14 +97,14 @@
12697 #ifdef CONFIG_NUMA_BALANCING
12798 extern bool pmd_trans_migrating(pmd_t pmd);
12899 extern int migrate_misplaced_page(struct page *page,
129
-				  struct vm_area_struct *vma, int node);
100
+				  struct vm_fault *vmf, int node);
130101 #else
131102 static inline bool pmd_trans_migrating(pmd_t pmd)
132103 {
133104 	return false;
134105 }
135106 static inline int migrate_misplaced_page(struct page *page,
136
-					 struct vm_area_struct *vma, int node)
107
+					 struct vm_fault *vmf, int node)
137108 {
138109 	return -EAGAIN; /* can't migrate now */
139110 }
....@@ -168,8 +139,6 @@
168139 #define MIGRATE_PFN_MIGRATE	(1UL << 1)
169140 #define MIGRATE_PFN_LOCKED	(1UL << 2)
170141 #define MIGRATE_PFN_WRITE	(1UL << 3)
171
-#define MIGRATE_PFN_DEVICE	(1UL << 4)
172
-#define MIGRATE_PFN_ERROR	(1UL << 5)
173142 #define MIGRATE_PFN_SHIFT	6
174143 
175144 static inline struct page *migrate_pfn_to_page(unsigned long mpfn)
....@@ -184,107 +153,43 @@
184153 	return (pfn << MIGRATE_PFN_SHIFT) | MIGRATE_PFN_VALID;
185154 }
186155 
187
-/*
188
- * struct migrate_vma_ops - migrate operation callback
189
- *
190
- * @alloc_and_copy: alloc destination memory and copy source memory to it
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- * @finalize_and_map: allow caller to map the successfully migrated pages
192
- *
193
- *
194
- * The alloc_and_copy() callback happens once all source pages have been locked,
195
- * unmapped and checked (checked whether pinned or not). All pages that can be
196
- * migrated will have an entry in the src array set with the pfn value of the
197
- * page and with the MIGRATE_PFN_VALID and MIGRATE_PFN_MIGRATE flag set (other
198
- * flags might be set but should be ignored by the callback).
199
- *
200
- * The alloc_and_copy() callback can then allocate destination memory and copy
201
- * source memory to it for all those entries (ie with MIGRATE_PFN_VALID and
202
- * MIGRATE_PFN_MIGRATE flag set). Once these are allocated and copied, the
203
- * callback must update each corresponding entry in the dst array with the pfn
204
- * value of the destination page and with the MIGRATE_PFN_VALID and
205
- * MIGRATE_PFN_LOCKED flags set (destination pages must have their struct pages
206
- * locked, via lock_page()).
207
- *
208
- * At this point the alloc_and_copy() callback is done and returns.
209
- *
210
- * Note that the callback does not have to migrate all the pages that are
211
- * marked with MIGRATE_PFN_MIGRATE flag in src array unless this is a migration
212
- * from device memory to system memory (ie the MIGRATE_PFN_DEVICE flag is also
213
- * set in the src array entry). If the device driver cannot migrate a device
214
- * page back to system memory, then it must set the corresponding dst array
215
- * entry to MIGRATE_PFN_ERROR. This will trigger a SIGBUS if CPU tries to
216
- * access any of the virtual addresses originally backed by this page. Because
217
- * a SIGBUS is such a severe result for the userspace process, the device
218
- * driver should avoid setting MIGRATE_PFN_ERROR unless it is really in an
219
- * unrecoverable state.
220
- *
221
- * For empty entry inside CPU page table (pte_none() or pmd_none() is true) we
222
- * do set MIGRATE_PFN_MIGRATE flag inside the corresponding source array thus
223
- * allowing device driver to allocate device memory for those unback virtual
224
- * address. For this the device driver simply have to allocate device memory
225
- * and properly set the destination entry like for regular migration. Note that
226
- * this can still fails and thus inside the device driver must check if the
227
- * migration was successful for those entry inside the finalize_and_map()
228
- * callback just like for regular migration.
229
- *
230
- * THE alloc_and_copy() CALLBACK MUST NOT CHANGE ANY OF THE SRC ARRAY ENTRIES
231
- * OR BAD THINGS WILL HAPPEN !
232
- *
233
- *
234
- * The finalize_and_map() callback happens after struct page migration from
235
- * source to destination (destination struct pages are the struct pages for the
236
- * memory allocated by the alloc_and_copy() callback).  Migration can fail, and
237
- * thus the finalize_and_map() allows the driver to inspect which pages were
238
- * successfully migrated, and which were not. Successfully migrated pages will
239
- * have the MIGRATE_PFN_MIGRATE flag set for their src array entry.
240
- *
241
- * It is safe to update device page table from within the finalize_and_map()
242
- * callback because both destination and source page are still locked, and the
243
- * mmap_sem is held in read mode (hence no one can unmap the range being
244
- * migrated).
245
- *
246
- * Once callback is done cleaning up things and updating its page table (if it
247
- * chose to do so, this is not an obligation) then it returns. At this point,
248
- * the HMM core will finish up the final steps, and the migration is complete.
249
- *
250
- * THE finalize_and_map() CALLBACK MUST NOT CHANGE ANY OF THE SRC OR DST ARRAY
251
- * ENTRIES OR BAD THINGS WILL HAPPEN !
252
- */
253
-struct migrate_vma_ops {
254
-	void (*alloc_and_copy)(struct vm_area_struct *vma,
255
-			       const unsigned long *src,
256
-			       unsigned long *dst,
257
-			       unsigned long start,
258
-			       unsigned long end,
259
-			       void *private);
260
-	void (*finalize_and_map)(struct vm_area_struct *vma,
261
-				 const unsigned long *src,
262
-				 const unsigned long *dst,
263
-				 unsigned long start,
264
-				 unsigned long end,
265
-				 void *private);
156
+enum migrate_vma_direction {
157
+	MIGRATE_VMA_SELECT_SYSTEM = 1 << 0,
158
+	MIGRATE_VMA_SELECT_DEVICE_PRIVATE = 1 << 1,
266159 };
267160 
268
-#if defined(CONFIG_MIGRATE_VMA_HELPER)
269
-int migrate_vma(const struct migrate_vma_ops *ops,
270
-		struct vm_area_struct *vma,
271
-		unsigned long start,
272
-		unsigned long end,
273
-		unsigned long *src,
274
-		unsigned long *dst,
275
-		void *private);
276
-#else
277
-static inline int migrate_vma(const struct migrate_vma_ops *ops,
278
-			      struct vm_area_struct *vma,
279
-			      unsigned long start,
280
-			      unsigned long end,
281
-			      unsigned long *src,
282
-			      unsigned long *dst,
283
-			      void *private)
284
-{
285
-	return -EINVAL;
286
-}
287
-#endif /* IS_ENABLED(CONFIG_MIGRATE_VMA_HELPER) */
161
+struct migrate_vma {
162
+	struct vm_area_struct	*vma;
163
+	/*
164
+	 * Both src and dst array must be big enough for
165
+	 * (end - start) >> PAGE_SHIFT entries.
166
+	 *
167
+	 * The src array must not be modified by the caller after
168
+	 * migrate_vma_setup(), and must not change the dst array after
169
+	 * migrate_vma_pages() returns.
170
+	 */
171
+	unsigned long		*dst;
172
+	unsigned long		*src;
173
+	unsigned long		cpages;
174
+	unsigned long		npages;
175
+	unsigned long		start;
176
+	unsigned long		end;
177
+
178
+	/*
179
+	 * Set to the owner value also stored in page->pgmap->owner for
180
+	 * migrating out of device private memory. The flags also need to
181
+	 * be set to MIGRATE_VMA_SELECT_DEVICE_PRIVATE.
182
+	 * The caller should always set this field when using mmu notifier
183
+	 * callbacks to avoid device MMU invalidations for device private
184
+	 * pages that are not being migrated.
185
+	 */
186
+	void			*pgmap_owner;
187
+	unsigned long		flags;
188
+};
189
+
190
+int migrate_vma_setup(struct migrate_vma *args);
191
+void migrate_vma_pages(struct migrate_vma *migrate);
192
+void migrate_vma_finalize(struct migrate_vma *migrate);
288193 
289194 #endif /* CONFIG_MIGRATION */
290195