Blame view
mm/memremap.c
14 KB
5981690dd memremap: split d... |
1 2 |
/* SPDX-License-Identifier: GPL-2.0 */ /* Copyright(c) 2015 Intel Corporation. All rights reserved. */ |
7d3dcf26a devres: add devm_... |
3 |
#include <linux/device.h> |
92281dee8 arch: introduce m... |
4 |
#include <linux/io.h> |
0207df4fa kernel/memremap, ... |
5 |
#include <linux/kasan.h> |
41e94a851 add devm_memremap... |
6 |
#include <linux/memory_hotplug.h> |
bcfa4b721 memremap: Convert... |
7 8 |
#include <linux/mm.h> #include <linux/pfn_t.h> |
5042db43c mm/ZONE_DEVICE: n... |
9 |
#include <linux/swap.h> |
9ffc1d19f mm/memremap_pages... |
10 |
#include <linux/mmzone.h> |
5042db43c mm/ZONE_DEVICE: n... |
11 |
#include <linux/swapops.h> |
bcfa4b721 memremap: Convert... |
12 |
#include <linux/types.h> |
e76384884 mm: introduce MEM... |
13 |
#include <linux/wait_bit.h> |
bcfa4b721 memremap: Convert... |
14 |
#include <linux/xarray.h> |
92281dee8 arch: introduce m... |
15 |
|
bcfa4b721 memremap: Convert... |
16 |
static DEFINE_XARRAY(pgmap_array); |
9476df7d8 mm: introduce fin... |
17 |
|
9ffc1d19f mm/memremap_pages... |
18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 |
/* * The memremap() and memremap_pages() interfaces are alternately used * to map persistent memory namespaces. These interfaces place different * constraints on the alignment and size of the mapping (namespace). * memremap() can map individual PAGE_SIZE pages. memremap_pages() can * only map subsections (2MB), and at least one architecture (PowerPC) * the minimum mapping granularity of memremap_pages() is 16MB. * * The role of memremap_compat_align() is to communicate the minimum * arch supported alignment of a namespace such that it can freely * switch modes without violating the arch constraint. Namely, do not * allow a namespace to be PAGE_SIZE aligned since that namespace may be * reconfigured into a mode that requires SUBSECTION_SIZE alignment. */ #ifndef CONFIG_ARCH_HAS_MEMREMAP_COMPAT_ALIGN unsigned long memremap_compat_align(void) { return SUBSECTION_SIZE; } EXPORT_SYMBOL_GPL(memremap_compat_align); #endif |
f6a55e1a3 memremap: lift th... |
39 40 41 |
#ifdef CONFIG_DEV_PAGEMAP_OPS DEFINE_STATIC_KEY_FALSE(devmap_managed_key); EXPORT_SYMBOL(devmap_managed_key); |
f6a55e1a3 memremap: lift th... |
42 |
|
46b1ee38b mm/mremap_pages: ... |
43 |
static void devmap_managed_enable_put(struct dev_pagemap *pgmap) |
f6a55e1a3 memremap: lift th... |
44 |
{ |
46b1ee38b mm/mremap_pages: ... |
45 46 47 |
if (pgmap->type == MEMORY_DEVICE_PRIVATE || pgmap->type == MEMORY_DEVICE_FS_DAX) static_branch_dec(&devmap_managed_key); |
f6a55e1a3 memremap: lift th... |
48 |
} |
46b1ee38b mm/mremap_pages: ... |
49 |
static void devmap_managed_enable_get(struct dev_pagemap *pgmap) |
f6a55e1a3 memremap: lift th... |
50 |
{ |
46b1ee38b mm/mremap_pages: ... |
51 52 53 |
if (pgmap->type == MEMORY_DEVICE_PRIVATE || pgmap->type == MEMORY_DEVICE_FS_DAX) static_branch_inc(&devmap_managed_key); |
f6a55e1a3 memremap: lift th... |
54 55 |
} #else |
46b1ee38b mm/mremap_pages: ... |
56 |
static void devmap_managed_enable_get(struct dev_pagemap *pgmap) |
f6a55e1a3 memremap: lift th... |
57 |
{ |
f6a55e1a3 memremap: lift th... |
58 |
} |
46b1ee38b mm/mremap_pages: ... |
59 |
static void devmap_managed_enable_put(struct dev_pagemap *pgmap) |
6f42193fd memremap: don't u... |
60 61 |
{ } |
f6a55e1a3 memremap: lift th... |
62 |
#endif /* CONFIG_DEV_PAGEMAP_OPS */ |
a4574f63e mm/memremap_pages... |
63 |
static void pgmap_array_delete(struct range *range) |
ab1b597ee mm, devm_memremap... |
64 |
{ |
a4574f63e mm/memremap_pages... |
65 |
xa_store_range(&pgmap_array, PHYS_PFN(range->start), PHYS_PFN(range->end), |
bcfa4b721 memremap: Convert... |
66 |
NULL, GFP_KERNEL); |
ab1b597ee mm, devm_memremap... |
67 |
synchronize_rcu(); |
9476df7d8 mm: introduce fin... |
68 |
} |
b7b3c01b1 mm/memremap_pages... |
69 |
static unsigned long pfn_first(struct dev_pagemap *pgmap, int range_id) |
5c2c2587b mm, dax, pmem: in... |
70 |
{ |
b7b3c01b1 mm/memremap_pages... |
71 72 73 74 75 76 |
struct range *range = &pgmap->ranges[range_id]; unsigned long pfn = PHYS_PFN(range->start); if (range_id) return pfn; return pfn + vmem_altmap_offset(pgmap_altmap(pgmap)); |
5c2c2587b mm, dax, pmem: in... |
77 |
} |
b7b3c01b1 mm/memremap_pages... |
78 |
static unsigned long pfn_end(struct dev_pagemap *pgmap, int range_id) |
5c2c2587b mm, dax, pmem: in... |
79 |
{ |
b7b3c01b1 mm/memremap_pages... |
80 |
const struct range *range = &pgmap->ranges[range_id]; |
5c2c2587b mm, dax, pmem: in... |
81 |
|
a4574f63e mm/memremap_pages... |
82 |
return (range->start + range_len(range)) >> PAGE_SHIFT; |
5c2c2587b mm, dax, pmem: in... |
83 |
} |
949b93250 memremap: fix sof... |
84 85 86 87 88 89 |
static unsigned long pfn_next(unsigned long pfn) { if (pfn % 1024 == 0) cond_resched(); return pfn + 1; } |
b7b3c01b1 mm/memremap_pages... |
90 91 |
#define for_each_device_pfn(pfn, map, i) \ for (pfn = pfn_first(map, i); pfn < pfn_end(map, i); pfn = pfn_next(pfn)) |
5c2c2587b mm, dax, pmem: in... |
92 |
|
24917f6b1 memremap: provide... |
93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 |
static void dev_pagemap_kill(struct dev_pagemap *pgmap) { if (pgmap->ops && pgmap->ops->kill) pgmap->ops->kill(pgmap); else percpu_ref_kill(pgmap->ref); } static void dev_pagemap_cleanup(struct dev_pagemap *pgmap) { if (pgmap->ops && pgmap->ops->cleanup) { pgmap->ops->cleanup(pgmap); } else { wait_for_completion(&pgmap->done); percpu_ref_exit(pgmap->ref); } |
06282373f mm/memremap: Fix ... |
109 110 111 112 113 114 |
/* * Undo the pgmap ref assignment for the internal case as the * caller may re-enable the same pgmap. */ if (pgmap->ref == &pgmap->internal_ref) pgmap->ref = NULL; |
24917f6b1 memremap: provide... |
115 |
} |
b7b3c01b1 mm/memremap_pages... |
116 |
static void pageunmap_range(struct dev_pagemap *pgmap, int range_id) |
41e94a851 add devm_memremap... |
117 |
{ |
b7b3c01b1 mm/memremap_pages... |
118 |
struct range *range = &pgmap->ranges[range_id]; |
77e080e76 mm/memunmap: don'... |
119 |
struct page *first_page; |
2c2a5af6f mm, memory_hotplu... |
120 |
int nid; |
713897038 mm, zone_device: ... |
121 |
|
77e080e76 mm/memunmap: don'... |
122 |
/* make sure to access a memmap that was actually initialized */ |
b7b3c01b1 mm/memremap_pages... |
123 |
first_page = pfn_to_page(pfn_first(pgmap, range_id)); |
77e080e76 mm/memunmap: don'... |
124 |
|
41e94a851 add devm_memremap... |
125 |
/* pages are dead and unused, undo the arch mapping */ |
77e080e76 mm/memunmap: don'... |
126 |
nid = page_to_nid(first_page); |
2c2a5af6f mm, memory_hotplu... |
127 |
|
f931ab479 mm: fix devm_memr... |
128 |
mem_hotplug_begin(); |
a4574f63e mm/memremap_pages... |
129 130 |
remove_pfn_range_from_zone(page_zone(first_page), PHYS_PFN(range->start), PHYS_PFN(range_len(range))); |
69324b8f4 mm, devm_memremap... |
131 |
if (pgmap->type == MEMORY_DEVICE_PRIVATE) { |
a4574f63e mm/memremap_pages... |
132 133 |
__remove_pages(PHYS_PFN(range->start), PHYS_PFN(range_len(range)), NULL); |
69324b8f4 mm, devm_memremap... |
134 |
} else { |
a4574f63e mm/memremap_pages... |
135 |
arch_remove_memory(nid, range->start, range_len(range), |
514caf23a memremap: replace... |
136 |
pgmap_altmap(pgmap)); |
a4574f63e mm/memremap_pages... |
137 |
kasan_remove_zero_shadow(__va(range->start), range_len(range)); |
69324b8f4 mm, devm_memremap... |
138 |
} |
f931ab479 mm: fix devm_memr... |
139 |
mem_hotplug_done(); |
b5d24fda9 mm, devm_memremap... |
140 |
|
a4574f63e mm/memremap_pages... |
141 142 |
untrack_pfn(NULL, PHYS_PFN(range->start), range_len(range)); pgmap_array_delete(range); |
b7b3c01b1 mm/memremap_pages... |
143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 |
} void memunmap_pages(struct dev_pagemap *pgmap) { unsigned long pfn; int i; dev_pagemap_kill(pgmap); for (i = 0; i < pgmap->nr_range; i++) for_each_device_pfn(pfn, pgmap, i) put_page(pfn_to_page(pfn)); dev_pagemap_cleanup(pgmap); for (i = 0; i < pgmap->nr_range; i++) pageunmap_range(pgmap, i); |
fdc029b19 memremap: remove ... |
158 159 |
WARN_ONCE(pgmap->altmap.alloc, "failed to free all reserved pages "); |
46b1ee38b mm/mremap_pages: ... |
160 |
devmap_managed_enable_put(pgmap); |
9476df7d8 mm: introduce fin... |
161 |
} |
6869b7b20 memremap: provide... |
162 163 164 165 166 167 |
EXPORT_SYMBOL_GPL(memunmap_pages); static void devm_memremap_pages_release(void *data) { memunmap_pages(data); } |
9476df7d8 mm: introduce fin... |
168 |
|
24917f6b1 memremap: provide... |
169 170 171 172 173 174 175 |
static void dev_pagemap_percpu_release(struct percpu_ref *ref) { struct dev_pagemap *pgmap = container_of(ref, struct dev_pagemap, internal_ref); complete(&pgmap->done); } |
b7b3c01b1 mm/memremap_pages... |
176 177 |
static int pagemap_range(struct dev_pagemap *pgmap, struct mhp_params *params, int range_id, int nid) |
41e94a851 add devm_memremap... |
178 |
{ |
b7b3c01b1 mm/memremap_pages... |
179 |
struct range *range = &pgmap->ranges[range_id]; |
966cf44f6 mm: defer ZONE_DE... |
180 |
struct dev_pagemap *conflict_pgmap; |
6869b7b20 memremap: provide... |
181 |
int error, is_ram; |
5f29a77cd mm: fix mixed zon... |
182 |
|
b7b3c01b1 mm/memremap_pages... |
183 184 185 186 |
if (WARN_ONCE(pgmap_altmap(pgmap) && range_id > 0, "altmap not supported for multiple ranges ")) return -EINVAL; |
f6a55e1a3 memremap: lift th... |
187 |
|
a4574f63e mm/memremap_pages... |
188 |
conflict_pgmap = get_dev_pagemap(PHYS_PFN(range->start), NULL); |
15d36fecd mm: disallow mapp... |
189 |
if (conflict_pgmap) { |
6869b7b20 memremap: provide... |
190 191 |
WARN(1, "Conflicting mapping in same section "); |
15d36fecd mm: disallow mapp... |
192 |
put_dev_pagemap(conflict_pgmap); |
b7b3c01b1 mm/memremap_pages... |
193 |
return -ENOMEM; |
15d36fecd mm: disallow mapp... |
194 |
} |
a4574f63e mm/memremap_pages... |
195 |
conflict_pgmap = get_dev_pagemap(PHYS_PFN(range->end), NULL); |
15d36fecd mm: disallow mapp... |
196 |
if (conflict_pgmap) { |
6869b7b20 memremap: provide... |
197 198 |
WARN(1, "Conflicting mapping in same section "); |
15d36fecd mm: disallow mapp... |
199 |
put_dev_pagemap(conflict_pgmap); |
b7b3c01b1 mm/memremap_pages... |
200 |
return -ENOMEM; |
15d36fecd mm: disallow mapp... |
201 |
} |
a4574f63e mm/memremap_pages... |
202 |
is_ram = region_intersects(range->start, range_len(range), |
d37a14bb5 Merge branch 'cor... |
203 |
IORESOURCE_SYSTEM_RAM, IORES_DESC_NONE); |
41e94a851 add devm_memremap... |
204 |
|
06489cfbd mm, devm_memremap... |
205 |
if (is_ram != REGION_DISJOINT) { |
a4574f63e mm/memremap_pages... |
206 207 208 209 |
WARN_ONCE(1, "attempted on %s region %#llx-%#llx ", is_ram == REGION_MIXED ? "mixed" : "ram", range->start, range->end); |
b7b3c01b1 mm/memremap_pages... |
210 |
return -ENXIO; |
41e94a851 add devm_memremap... |
211 |
} |
a4574f63e mm/memremap_pages... |
212 213 |
error = xa_err(xa_store_range(&pgmap_array, PHYS_PFN(range->start), PHYS_PFN(range->end), pgmap, GFP_KERNEL)); |
9476df7d8 mm: introduce fin... |
214 |
if (error) |
b7b3c01b1 mm/memremap_pages... |
215 |
return error; |
9476df7d8 mm: introduce fin... |
216 |
|
41e94a851 add devm_memremap... |
217 |
if (nid < 0) |
7eff93b7c devm_memremap_pag... |
218 |
nid = numa_mem_id(); |
41e94a851 add devm_memremap... |
219 |
|
b7b3c01b1 mm/memremap_pages... |
220 |
error = track_pfn_remap(NULL, ¶ms->pgprot, PHYS_PFN(range->start), 0, |
a4574f63e mm/memremap_pages... |
221 |
range_len(range)); |
9049771f7 mm: fix cache mod... |
222 223 |
if (error) goto err_pfn_remap; |
f931ab479 mm: fix devm_memr... |
224 |
mem_hotplug_begin(); |
69324b8f4 mm, devm_memremap... |
225 226 227 228 229 230 231 232 233 234 235 236 237 |
/* * For device private memory we call add_pages() as we only need to * allocate and initialize struct page for the device memory. More- * over the device memory is un-accessible thus we do not want to * create a linear mapping for the memory like arch_add_memory() * would do. * * For all other device memory types, which are accessible by * the CPU, we do want the linear mapping and thus use * arch_add_memory(). */ if (pgmap->type == MEMORY_DEVICE_PRIVATE) { |
a4574f63e mm/memremap_pages... |
238 |
error = add_pages(nid, PHYS_PFN(range->start), |
b7b3c01b1 mm/memremap_pages... |
239 |
PHYS_PFN(range_len(range)), params); |
69324b8f4 mm, devm_memremap... |
240 |
} else { |
a4574f63e mm/memremap_pages... |
241 |
error = kasan_add_zero_shadow(__va(range->start), range_len(range)); |
69324b8f4 mm, devm_memremap... |
242 243 244 245 |
if (error) { mem_hotplug_done(); goto err_kasan; } |
a4574f63e mm/memremap_pages... |
246 |
error = arch_add_memory(nid, range->start, range_len(range), |
b7b3c01b1 mm/memremap_pages... |
247 |
params); |
69324b8f4 mm, devm_memremap... |
248 249 250 251 252 253 |
} if (!error) { struct zone *zone; zone = &NODE_DATA(nid)->node_zones[ZONE_DEVICE]; |
a4574f63e mm/memremap_pages... |
254 |
move_pfn_range_to_zone(zone, PHYS_PFN(range->start), |
d882c0067 mm: pass migratet... |
255 256 |
PHYS_PFN(range_len(range)), params->altmap, MIGRATE_MOVABLE); |
0207df4fa kernel/memremap, ... |
257 |
} |
f931ab479 mm: fix devm_memr... |
258 |
mem_hotplug_done(); |
9476df7d8 mm: introduce fin... |
259 260 |
if (error) goto err_add_memory; |
41e94a851 add devm_memremap... |
261 |
|
966cf44f6 mm: defer ZONE_DE... |
262 263 264 265 266 |
/* * Initialization of the pages has been deferred until now in order * to allow us to do the work while not holding the hotplug lock. */ memmap_init_zone_device(&NODE_DATA(nid)->node_zones[ZONE_DEVICE], |
a4574f63e mm/memremap_pages... |
267 268 |
PHYS_PFN(range->start), PHYS_PFN(range_len(range)), pgmap); |
b7b3c01b1 mm/memremap_pages... |
269 270 271 |
percpu_ref_get_many(pgmap->ref, pfn_end(pgmap, range_id) - pfn_first(pgmap, range_id)); return 0; |
9476df7d8 mm: introduce fin... |
272 |
|
b7b3c01b1 mm/memremap_pages... |
273 |
err_add_memory: |
a4574f63e mm/memremap_pages... |
274 |
kasan_remove_zero_shadow(__va(range->start), range_len(range)); |
b7b3c01b1 mm/memremap_pages... |
275 |
err_kasan: |
a4574f63e mm/memremap_pages... |
276 |
untrack_pfn(NULL, PHYS_PFN(range->start), range_len(range)); |
b7b3c01b1 mm/memremap_pages... |
277 |
err_pfn_remap: |
a4574f63e mm/memremap_pages... |
278 |
pgmap_array_delete(range); |
b7b3c01b1 mm/memremap_pages... |
279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 |
return error; } /* * Not device managed version of dev_memremap_pages, undone by * memunmap_pages(). Please use dev_memremap_pages if you have a struct * device available. */ void *memremap_pages(struct dev_pagemap *pgmap, int nid) { struct mhp_params params = { .altmap = pgmap_altmap(pgmap), .pgprot = PAGE_KERNEL, }; const int nr_range = pgmap->nr_range; |
b7b3c01b1 mm/memremap_pages... |
295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 |
int error, i; if (WARN_ONCE(!nr_range, "nr_range must be specified ")) return ERR_PTR(-EINVAL); switch (pgmap->type) { case MEMORY_DEVICE_PRIVATE: if (!IS_ENABLED(CONFIG_DEVICE_PRIVATE)) { WARN(1, "Device private memory not supported "); return ERR_PTR(-EINVAL); } if (!pgmap->ops || !pgmap->ops->migrate_to_ram) { WARN(1, "Missing migrate_to_ram method "); return ERR_PTR(-EINVAL); } |
46b1ee38b mm/mremap_pages: ... |
313 314 315 316 317 |
if (!pgmap->ops->page_free) { WARN(1, "Missing page_free method "); return ERR_PTR(-EINVAL); } |
b7b3c01b1 mm/memremap_pages... |
318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 |
if (!pgmap->owner) { WARN(1, "Missing owner "); return ERR_PTR(-EINVAL); } break; case MEMORY_DEVICE_FS_DAX: if (!IS_ENABLED(CONFIG_ZONE_DEVICE) || IS_ENABLED(CONFIG_FS_DAX_LIMITED)) { WARN(1, "File system DAX not supported "); return ERR_PTR(-EINVAL); } break; case MEMORY_DEVICE_GENERIC: |
b7b3c01b1 mm/memremap_pages... |
333 334 335 |
break; case MEMORY_DEVICE_PCI_P2PDMA: params.pgprot = pgprot_noncached(params.pgprot); |
b7b3c01b1 mm/memremap_pages... |
336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 |
break; default: WARN(1, "Invalid pgmap type %d ", pgmap->type); break; } if (!pgmap->ref) { if (pgmap->ops && (pgmap->ops->kill || pgmap->ops->cleanup)) return ERR_PTR(-EINVAL); init_completion(&pgmap->done); error = percpu_ref_init(&pgmap->internal_ref, dev_pagemap_percpu_release, 0, GFP_KERNEL); if (error) return ERR_PTR(error); pgmap->ref = &pgmap->internal_ref; } else { if (!pgmap->ops || !pgmap->ops->kill || !pgmap->ops->cleanup) { WARN(1, "Missing reference count teardown definition "); return ERR_PTR(-EINVAL); } } |
46b1ee38b mm/mremap_pages: ... |
360 |
devmap_managed_enable_get(pgmap); |
b7b3c01b1 mm/memremap_pages... |
361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 |
/* * Clear the pgmap nr_range as it will be incremented for each * successfully processed range. This communicates how many * regions to unwind in the abort case. */ pgmap->nr_range = 0; error = 0; for (i = 0; i < nr_range; i++) { error = pagemap_range(pgmap, ¶ms, i, nid); if (error) break; pgmap->nr_range++; } if (i < nr_range) { memunmap_pages(pgmap); pgmap->nr_range = nr_range; return ERR_PTR(error); } return __va(pgmap->ranges[0].start); |
41e94a851 add devm_memremap... |
383 |
} |
6869b7b20 memremap: provide... |
384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 |
EXPORT_SYMBOL_GPL(memremap_pages); /** * devm_memremap_pages - remap and provide memmap backing for the given resource * @dev: hosting device for @res * @pgmap: pointer to a struct dev_pagemap * * Notes: * 1/ At a minimum the res and type members of @pgmap must be initialized * by the caller before passing it to this function * * 2/ The altmap field may optionally be initialized, in which case * PGMAP_ALTMAP_VALID must be set in pgmap->flags. * * 3/ The ref field may optionally be provided, in which pgmap->ref must be * 'live' on entry and will be killed and reaped at * devm_memremap_pages_release() time, or if this routine fails. * |
a4574f63e mm/memremap_pages... |
402 |
* 4/ range is expected to be a host memory range that could feasibly be |
6869b7b20 memremap: provide... |
403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 |
* treated as a "System RAM" range, i.e. not a device mmio range, but * this is not enforced. */ void *devm_memremap_pages(struct device *dev, struct dev_pagemap *pgmap) { int error; void *ret; ret = memremap_pages(pgmap, dev_to_node(dev)); if (IS_ERR(ret)) return ret; error = devm_add_action_or_reset(dev, devm_memremap_pages_release, pgmap); if (error) return ERR_PTR(error); return ret; } |
808153e11 mm, devm_memremap... |
421 |
EXPORT_SYMBOL_GPL(devm_memremap_pages); |
4b94ffdc4 x86, mm: introduc... |
422 |
|
2e3f139e8 mm/devm_memremap_... |
423 424 425 426 427 |
void devm_memunmap_pages(struct device *dev, struct dev_pagemap *pgmap) { devm_release_action(dev, devm_memremap_pages_release, pgmap); } EXPORT_SYMBOL_GPL(devm_memunmap_pages); |
4b94ffdc4 x86, mm: introduc... |
428 429 430 |
unsigned long vmem_altmap_offset(struct vmem_altmap *altmap) { /* number of pfns from base where pfn_to_page() is valid */ |
514caf23a memremap: replace... |
431 432 433 |
if (altmap) return altmap->reserve + altmap->free; return 0; |
4b94ffdc4 x86, mm: introduc... |
434 435 436 437 438 439 |
} void vmem_altmap_free(struct vmem_altmap *altmap, unsigned long nr_pfns) { altmap->alloc -= nr_pfns; } |
0822acb86 mm: move get_dev_... |
440 441 442 443 444 |
/** * get_dev_pagemap() - take a new live reference on the dev_pagemap for @pfn * @pfn: page frame number to lookup page_map * @pgmap: optional known pgmap that already has a reference * |
832d7aa05 mm: optimize dev_... |
445 446 |
* If @pgmap is non-NULL and covers @pfn it will be returned as-is. If @pgmap * is non-NULL but does not cover @pfn the reference to it will be released. |
0822acb86 mm: move get_dev_... |
447 448 449 450 |
*/ struct dev_pagemap *get_dev_pagemap(unsigned long pfn, struct dev_pagemap *pgmap) { |
0822acb86 mm: move get_dev_... |
451 452 453 |
resource_size_t phys = PFN_PHYS(pfn); /* |
832d7aa05 mm: optimize dev_... |
454 |
* In the cached case we're already holding a live reference. |
0822acb86 mm: move get_dev_... |
455 |
*/ |
832d7aa05 mm: optimize dev_... |
456 |
if (pgmap) { |
a4574f63e mm/memremap_pages... |
457 |
if (phys >= pgmap->range.start && phys <= pgmap->range.end) |
832d7aa05 mm: optimize dev_... |
458 459 |
return pgmap; put_dev_pagemap(pgmap); |
0822acb86 mm: move get_dev_... |
460 461 462 463 |
} /* fall back to slow path lookup */ rcu_read_lock(); |
bcfa4b721 memremap: Convert... |
464 |
pgmap = xa_load(&pgmap_array, PHYS_PFN(phys)); |
0822acb86 mm: move get_dev_... |
465 466 467 468 469 470 |
if (pgmap && !percpu_ref_tryget_live(pgmap->ref)) pgmap = NULL; rcu_read_unlock(); return pgmap; } |
e76384884 mm: introduce MEM... |
471 |
EXPORT_SYMBOL_GPL(get_dev_pagemap); |
7b2d55d2c mm/ZONE_DEVICE: s... |
472 |
|
e76384884 mm: introduce MEM... |
473 |
#ifdef CONFIG_DEV_PAGEMAP_OPS |
07d802699 mm: devmap: refac... |
474 |
void free_devmap_managed_page(struct page *page) |
7b2d55d2c mm/ZONE_DEVICE: s... |
475 |
{ |
429589d64 mm: Cleanup __put... |
476 477 478 479 480 |
/* notify page idle for dax */ if (!is_device_private_page(page)) { wake_up_var(&page->_refcount); return; } |
7ab0ad0e7 mm/hmm: fix ZONE_... |
481 |
|
429589d64 mm: Cleanup __put... |
482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 |
__ClearPageWaiters(page); mem_cgroup_uncharge(page); /* * When a device_private page is freed, the page->mapping field * may still contain a (stale) mapping value. For example, the * lower bits of page->mapping may still identify the page as an * anonymous page. Ultimately, this entire field is just stale * and wrong, and it will cause errors if not cleared. One * example is: * * migrate_vma_pages() * migrate_vma_insert_page() * page_add_new_anon_rmap() * __page_set_anon_rmap() * ...checks page->mapping, via PageAnon(page) call, * and incorrectly concludes that the page is an * anonymous page. Therefore, it incorrectly, * silently fails to set up the new anon rmap. * * For other types of ZONE_DEVICE pages, migration is either * handled differently or not done at all, so there is no need * to clear page->mapping. */ page->mapping = NULL; page->pgmap->ops->page_free(page); |
7b2d55d2c mm/ZONE_DEVICE: s... |
509 |
} |
e76384884 mm: introduce MEM... |
510 |
#endif /* CONFIG_DEV_PAGEMAP_OPS */ |