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8607a965 | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
a254129e JK |
2 | /* |
3 | * Contiguous Memory Allocator | |
4 | * | |
5 | * Copyright (c) 2010-2011 by Samsung Electronics. | |
6 | * Copyright IBM Corporation, 2013 | |
7 | * Copyright LG Electronics Inc., 2014 | |
8 | * Written by: | |
9 | * Marek Szyprowski <m.szyprowski@samsung.com> | |
10 | * Michal Nazarewicz <mina86@mina86.com> | |
11 | * Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com> | |
12 | * Joonsoo Kim <iamjoonsoo.kim@lge.com> | |
a254129e JK |
13 | */ |
14 | ||
15 | #define pr_fmt(fmt) "cma: " fmt | |
16 | ||
17 | #ifdef CONFIG_CMA_DEBUG | |
18 | #ifndef DEBUG | |
19 | # define DEBUG | |
20 | #endif | |
21 | #endif | |
99e8ea6c | 22 | #define CREATE_TRACE_POINTS |
a254129e JK |
23 | |
24 | #include <linux/memblock.h> | |
25 | #include <linux/err.h> | |
26 | #include <linux/mm.h> | |
27 | #include <linux/mutex.h> | |
28 | #include <linux/sizes.h> | |
29 | #include <linux/slab.h> | |
30 | #include <linux/log2.h> | |
31 | #include <linux/cma.h> | |
f7426b98 | 32 | #include <linux/highmem.h> |
620951e2 | 33 | #include <linux/io.h> |
514c6032 | 34 | #include <linux/kmemleak.h> |
99e8ea6c | 35 | #include <trace/events/cma.h> |
a254129e | 36 | |
28b24c1f SL |
37 | #include "cma.h" |
38 | ||
39 | struct cma cma_areas[MAX_CMA_AREAS]; | |
40 | unsigned cma_area_count; | |
a254129e | 41 | |
ac173824 | 42 | phys_addr_t cma_get_base(const struct cma *cma) |
a254129e JK |
43 | { |
44 | return PFN_PHYS(cma->base_pfn); | |
45 | } | |
46 | ||
ac173824 | 47 | unsigned long cma_get_size(const struct cma *cma) |
a254129e JK |
48 | { |
49 | return cma->count << PAGE_SHIFT; | |
50 | } | |
51 | ||
f318dd08 LA |
52 | const char *cma_get_name(const struct cma *cma) |
53 | { | |
18e98e56 | 54 | return cma->name; |
f318dd08 LA |
55 | } |
56 | ||
ac173824 | 57 | static unsigned long cma_bitmap_aligned_mask(const struct cma *cma, |
e048cb32 | 58 | unsigned int align_order) |
a254129e | 59 | { |
68faed63 WY |
60 | if (align_order <= cma->order_per_bit) |
61 | return 0; | |
62 | return (1UL << (align_order - cma->order_per_bit)) - 1; | |
a254129e JK |
63 | } |
64 | ||
850fc430 | 65 | /* |
e048cb32 DB |
66 | * Find the offset of the base PFN from the specified align_order. |
67 | * The value returned is represented in order_per_bits. | |
850fc430 | 68 | */ |
ac173824 | 69 | static unsigned long cma_bitmap_aligned_offset(const struct cma *cma, |
e048cb32 | 70 | unsigned int align_order) |
b5be83e3 | 71 | { |
e048cb32 DB |
72 | return (cma->base_pfn & ((1UL << align_order) - 1)) |
73 | >> cma->order_per_bit; | |
b5be83e3 GF |
74 | } |
75 | ||
ac173824 SL |
76 | static unsigned long cma_bitmap_pages_to_bits(const struct cma *cma, |
77 | unsigned long pages) | |
a254129e JK |
78 | { |
79 | return ALIGN(pages, 1UL << cma->order_per_bit) >> cma->order_per_bit; | |
80 | } | |
81 | ||
ac173824 SL |
82 | static void cma_clear_bitmap(struct cma *cma, unsigned long pfn, |
83 | unsigned int count) | |
a254129e JK |
84 | { |
85 | unsigned long bitmap_no, bitmap_count; | |
86 | ||
87 | bitmap_no = (pfn - cma->base_pfn) >> cma->order_per_bit; | |
88 | bitmap_count = cma_bitmap_pages_to_bits(cma, count); | |
89 | ||
90 | mutex_lock(&cma->lock); | |
91 | bitmap_clear(cma->bitmap, bitmap_no, bitmap_count); | |
92 | mutex_unlock(&cma->lock); | |
93 | } | |
94 | ||
3a5139f1 | 95 | static void __init cma_activate_area(struct cma *cma) |
a254129e | 96 | { |
a254129e JK |
97 | unsigned long base_pfn = cma->base_pfn, pfn = base_pfn; |
98 | unsigned i = cma->count >> pageblock_order; | |
99 | struct zone *zone; | |
100 | ||
2184f992 | 101 | cma->bitmap = bitmap_zalloc(cma_bitmap_maxno(cma), GFP_KERNEL); |
3a5139f1 MK |
102 | if (!cma->bitmap) |
103 | goto out_error; | |
a254129e | 104 | |
d883c6cf JK |
105 | WARN_ON_ONCE(!pfn_valid(pfn)); |
106 | zone = page_zone(pfn_to_page(pfn)); | |
107 | ||
a254129e JK |
108 | do { |
109 | unsigned j; | |
110 | ||
111 | base_pfn = pfn; | |
112 | for (j = pageblock_nr_pages; j; --j, pfn++) { | |
d883c6cf | 113 | WARN_ON_ONCE(!pfn_valid(pfn)); |
a254129e | 114 | /* |
d883c6cf JK |
115 | * alloc_contig_range requires the pfn range |
116 | * specified to be in the same zone. Make this | |
117 | * simple by forcing the entire CMA resv range | |
118 | * to be in the same zone. | |
a254129e JK |
119 | */ |
120 | if (page_zone(pfn_to_page(pfn)) != zone) | |
d883c6cf | 121 | goto not_in_zone; |
a254129e JK |
122 | } |
123 | init_cma_reserved_pageblock(pfn_to_page(base_pfn)); | |
124 | } while (--i); | |
125 | ||
126 | mutex_init(&cma->lock); | |
26b02a1f SL |
127 | |
128 | #ifdef CONFIG_CMA_DEBUGFS | |
129 | INIT_HLIST_HEAD(&cma->mem_head); | |
130 | spin_lock_init(&cma->mem_head_lock); | |
131 | #endif | |
132 | ||
3a5139f1 | 133 | return; |
a254129e | 134 | |
d883c6cf | 135 | not_in_zone: |
2184f992 | 136 | bitmap_free(cma->bitmap); |
3a5139f1 | 137 | out_error: |
f022d8cb | 138 | cma->count = 0; |
3a5139f1 MK |
139 | pr_err("CMA area %s could not be activated\n", cma->name); |
140 | return; | |
a254129e JK |
141 | } |
142 | ||
143 | static int __init cma_init_reserved_areas(void) | |
144 | { | |
145 | int i; | |
146 | ||
3a5139f1 MK |
147 | for (i = 0; i < cma_area_count; i++) |
148 | cma_activate_area(&cma_areas[i]); | |
a254129e JK |
149 | |
150 | return 0; | |
151 | } | |
d883c6cf | 152 | core_initcall(cma_init_reserved_areas); |
a254129e | 153 | |
de9e14ee MS |
154 | /** |
155 | * cma_init_reserved_mem() - create custom contiguous area from reserved memory | |
156 | * @base: Base address of the reserved area | |
157 | * @size: Size of the reserved area (in bytes), | |
158 | * @order_per_bit: Order of pages represented by one bit on bitmap. | |
e8b098fc MR |
159 | * @name: The name of the area. If this parameter is NULL, the name of |
160 | * the area will be set to "cmaN", where N is a running counter of | |
161 | * used areas. | |
de9e14ee MS |
162 | * @res_cma: Pointer to store the created cma region. |
163 | * | |
164 | * This function creates custom contiguous area from already reserved memory. | |
165 | */ | |
166 | int __init cma_init_reserved_mem(phys_addr_t base, phys_addr_t size, | |
ac173824 | 167 | unsigned int order_per_bit, |
f318dd08 | 168 | const char *name, |
ac173824 | 169 | struct cma **res_cma) |
de9e14ee MS |
170 | { |
171 | struct cma *cma; | |
172 | phys_addr_t alignment; | |
173 | ||
174 | /* Sanity checks */ | |
175 | if (cma_area_count == ARRAY_SIZE(cma_areas)) { | |
176 | pr_err("Not enough slots for CMA reserved regions!\n"); | |
177 | return -ENOSPC; | |
178 | } | |
179 | ||
180 | if (!size || !memblock_is_region_reserved(base, size)) | |
181 | return -EINVAL; | |
182 | ||
0f96ae29 | 183 | /* ensure minimal alignment required by mm core */ |
badbda53 SR |
184 | alignment = PAGE_SIZE << |
185 | max_t(unsigned long, MAX_ORDER - 1, pageblock_order); | |
de9e14ee MS |
186 | |
187 | /* alignment should be aligned with order_per_bit */ | |
188 | if (!IS_ALIGNED(alignment >> PAGE_SHIFT, 1 << order_per_bit)) | |
189 | return -EINVAL; | |
190 | ||
191 | if (ALIGN(base, alignment) != base || ALIGN(size, alignment) != size) | |
192 | return -EINVAL; | |
193 | ||
194 | /* | |
195 | * Each reserved area must be initialised later, when more kernel | |
196 | * subsystems (like slab allocator) are available. | |
197 | */ | |
198 | cma = &cma_areas[cma_area_count]; | |
18e98e56 BS |
199 | |
200 | if (name) | |
201 | snprintf(cma->name, CMA_MAX_NAME, name); | |
202 | else | |
203 | snprintf(cma->name, CMA_MAX_NAME, "cma%d\n", cma_area_count); | |
204 | ||
de9e14ee MS |
205 | cma->base_pfn = PFN_DOWN(base); |
206 | cma->count = size >> PAGE_SHIFT; | |
207 | cma->order_per_bit = order_per_bit; | |
208 | *res_cma = cma; | |
209 | cma_area_count++; | |
94737a85 | 210 | totalcma_pages += (size / PAGE_SIZE); |
de9e14ee MS |
211 | |
212 | return 0; | |
213 | } | |
214 | ||
a254129e | 215 | /** |
8676af1f | 216 | * cma_declare_contiguous_nid() - reserve custom contiguous area |
a254129e | 217 | * @base: Base address of the reserved area optional, use 0 for any |
c1f733aa | 218 | * @size: Size of the reserved area (in bytes), |
a254129e JK |
219 | * @limit: End address of the reserved memory (optional, 0 for any). |
220 | * @alignment: Alignment for the CMA area, should be power of 2 or zero | |
221 | * @order_per_bit: Order of pages represented by one bit on bitmap. | |
a254129e | 222 | * @fixed: hint about where to place the reserved area |
e8b098fc | 223 | * @name: The name of the area. See function cma_init_reserved_mem() |
c1f733aa | 224 | * @res_cma: Pointer to store the created cma region. |
8676af1f | 225 | * @nid: nid of the free area to find, %NUMA_NO_NODE for any node |
a254129e JK |
226 | * |
227 | * This function reserves memory from early allocator. It should be | |
228 | * called by arch specific code once the early allocator (memblock or bootmem) | |
229 | * has been activated and all other subsystems have already allocated/reserved | |
230 | * memory. This function allows to create custom reserved areas. | |
231 | * | |
232 | * If @fixed is true, reserve contiguous area at exactly @base. If false, | |
233 | * reserve in range from @base to @limit. | |
234 | */ | |
8676af1f | 235 | int __init cma_declare_contiguous_nid(phys_addr_t base, |
c1f733aa | 236 | phys_addr_t size, phys_addr_t limit, |
a254129e | 237 | phys_addr_t alignment, unsigned int order_per_bit, |
8676af1f AB |
238 | bool fixed, const char *name, struct cma **res_cma, |
239 | int nid) | |
a254129e | 240 | { |
f7426b98 | 241 | phys_addr_t memblock_end = memblock_end_of_DRAM(); |
6b101e2a | 242 | phys_addr_t highmem_start; |
a254129e JK |
243 | int ret = 0; |
244 | ||
6b101e2a | 245 | /* |
2dece445 LA |
246 | * We can't use __pa(high_memory) directly, since high_memory |
247 | * isn't a valid direct map VA, and DEBUG_VIRTUAL will (validly) | |
248 | * complain. Find the boundary by adding one to the last valid | |
249 | * address. | |
6b101e2a | 250 | */ |
2dece445 | 251 | highmem_start = __pa(high_memory - 1) + 1; |
56fa4f60 LP |
252 | pr_debug("%s(size %pa, base %pa, limit %pa alignment %pa)\n", |
253 | __func__, &size, &base, &limit, &alignment); | |
a254129e JK |
254 | |
255 | if (cma_area_count == ARRAY_SIZE(cma_areas)) { | |
256 | pr_err("Not enough slots for CMA reserved regions!\n"); | |
257 | return -ENOSPC; | |
258 | } | |
259 | ||
260 | if (!size) | |
261 | return -EINVAL; | |
262 | ||
263 | if (alignment && !is_power_of_2(alignment)) | |
264 | return -EINVAL; | |
265 | ||
266 | /* | |
267 | * Sanitise input arguments. | |
268 | * Pages both ends in CMA area could be merged into adjacent unmovable | |
269 | * migratetype page by page allocator's buddy algorithm. In the case, | |
270 | * you couldn't get a contiguous memory, which is not what we want. | |
271 | */ | |
badbda53 SR |
272 | alignment = max(alignment, (phys_addr_t)PAGE_SIZE << |
273 | max_t(unsigned long, MAX_ORDER - 1, pageblock_order)); | |
c633324e DB |
274 | if (fixed && base & (alignment - 1)) { |
275 | ret = -EINVAL; | |
276 | pr_err("Region at %pa must be aligned to %pa bytes\n", | |
277 | &base, &alignment); | |
278 | goto err; | |
279 | } | |
a254129e JK |
280 | base = ALIGN(base, alignment); |
281 | size = ALIGN(size, alignment); | |
282 | limit &= ~(alignment - 1); | |
283 | ||
800a85d3 LP |
284 | if (!base) |
285 | fixed = false; | |
286 | ||
a254129e JK |
287 | /* size should be aligned with order_per_bit */ |
288 | if (!IS_ALIGNED(size >> PAGE_SHIFT, 1 << order_per_bit)) | |
289 | return -EINVAL; | |
290 | ||
f7426b98 | 291 | /* |
16195ddd LP |
292 | * If allocating at a fixed base the request region must not cross the |
293 | * low/high memory boundary. | |
f7426b98 | 294 | */ |
16195ddd | 295 | if (fixed && base < highmem_start && base + size > highmem_start) { |
f7426b98 | 296 | ret = -EINVAL; |
56fa4f60 LP |
297 | pr_err("Region at %pa defined on low/high memory boundary (%pa)\n", |
298 | &base, &highmem_start); | |
f7426b98 MS |
299 | goto err; |
300 | } | |
301 | ||
16195ddd LP |
302 | /* |
303 | * If the limit is unspecified or above the memblock end, its effective | |
304 | * value will be the memblock end. Set it explicitly to simplify further | |
305 | * checks. | |
306 | */ | |
307 | if (limit == 0 || limit > memblock_end) | |
308 | limit = memblock_end; | |
309 | ||
c633324e DB |
310 | if (base + size > limit) { |
311 | ret = -EINVAL; | |
312 | pr_err("Size (%pa) of region at %pa exceeds limit (%pa)\n", | |
313 | &size, &base, &limit); | |
314 | goto err; | |
315 | } | |
316 | ||
a254129e | 317 | /* Reserve memory */ |
800a85d3 | 318 | if (fixed) { |
a254129e JK |
319 | if (memblock_is_region_reserved(base, size) || |
320 | memblock_reserve(base, size) < 0) { | |
321 | ret = -EBUSY; | |
322 | goto err; | |
323 | } | |
324 | } else { | |
16195ddd LP |
325 | phys_addr_t addr = 0; |
326 | ||
327 | /* | |
328 | * All pages in the reserved area must come from the same zone. | |
329 | * If the requested region crosses the low/high memory boundary, | |
330 | * try allocating from high memory first and fall back to low | |
331 | * memory in case of failure. | |
332 | */ | |
333 | if (base < highmem_start && limit > highmem_start) { | |
8676af1f | 334 | addr = memblock_alloc_range_nid(size, alignment, |
40366bd7 | 335 | highmem_start, limit, nid, true); |
16195ddd LP |
336 | limit = highmem_start; |
337 | } | |
338 | ||
df2ff39e RG |
339 | /* |
340 | * If there is enough memory, try a bottom-up allocation first. | |
341 | * It will place the new cma area close to the start of the node | |
342 | * and guarantee that the compaction is moving pages out of the | |
343 | * cma area and not into it. | |
344 | * Avoid using first 4GB to not interfere with constrained zones | |
345 | * like DMA/DMA32. | |
346 | */ | |
347 | #ifdef CONFIG_PHYS_ADDR_T_64BIT | |
348 | if (!memblock_bottom_up() && memblock_end >= SZ_4G + size) { | |
349 | memblock_set_bottom_up(true); | |
350 | addr = memblock_alloc_range_nid(size, alignment, SZ_4G, | |
351 | limit, nid, true); | |
352 | memblock_set_bottom_up(false); | |
353 | } | |
354 | #endif | |
355 | ||
a254129e | 356 | if (!addr) { |
8676af1f | 357 | addr = memblock_alloc_range_nid(size, alignment, base, |
40366bd7 | 358 | limit, nid, true); |
16195ddd LP |
359 | if (!addr) { |
360 | ret = -ENOMEM; | |
361 | goto err; | |
362 | } | |
a254129e | 363 | } |
16195ddd | 364 | |
620951e2 TR |
365 | /* |
366 | * kmemleak scans/reads tracked objects for pointers to other | |
367 | * objects but this address isn't mapped and accessible | |
368 | */ | |
9099daed | 369 | kmemleak_ignore_phys(addr); |
16195ddd | 370 | base = addr; |
a254129e JK |
371 | } |
372 | ||
f318dd08 | 373 | ret = cma_init_reserved_mem(base, size, order_per_bit, name, res_cma); |
de9e14ee | 374 | if (ret) |
0d3bd18a | 375 | goto free_mem; |
a254129e | 376 | |
56fa4f60 LP |
377 | pr_info("Reserved %ld MiB at %pa\n", (unsigned long)size / SZ_1M, |
378 | &base); | |
a254129e JK |
379 | return 0; |
380 | ||
0d3bd18a PF |
381 | free_mem: |
382 | memblock_free(base, size); | |
a254129e | 383 | err: |
0de9d2eb | 384 | pr_err("Failed to reserve %ld MiB\n", (unsigned long)size / SZ_1M); |
a254129e JK |
385 | return ret; |
386 | } | |
387 | ||
dbe43d4d JK |
388 | #ifdef CONFIG_CMA_DEBUG |
389 | static void cma_debug_show_areas(struct cma *cma) | |
390 | { | |
2b59e01a | 391 | unsigned long next_zero_bit, next_set_bit, nr_zero; |
dbe43d4d | 392 | unsigned long start = 0; |
2b59e01a YH |
393 | unsigned long nr_part, nr_total = 0; |
394 | unsigned long nbits = cma_bitmap_maxno(cma); | |
dbe43d4d JK |
395 | |
396 | mutex_lock(&cma->lock); | |
397 | pr_info("number of available pages: "); | |
398 | for (;;) { | |
2b59e01a YH |
399 | next_zero_bit = find_next_zero_bit(cma->bitmap, nbits, start); |
400 | if (next_zero_bit >= nbits) | |
dbe43d4d | 401 | break; |
2b59e01a | 402 | next_set_bit = find_next_bit(cma->bitmap, nbits, next_zero_bit); |
dbe43d4d | 403 | nr_zero = next_set_bit - next_zero_bit; |
2b59e01a YH |
404 | nr_part = nr_zero << cma->order_per_bit; |
405 | pr_cont("%s%lu@%lu", nr_total ? "+" : "", nr_part, | |
406 | next_zero_bit); | |
407 | nr_total += nr_part; | |
dbe43d4d JK |
408 | start = next_zero_bit + nr_zero; |
409 | } | |
2b59e01a | 410 | pr_cont("=> %lu free of %lu total pages\n", nr_total, cma->count); |
dbe43d4d JK |
411 | mutex_unlock(&cma->lock); |
412 | } | |
413 | #else | |
414 | static inline void cma_debug_show_areas(struct cma *cma) { } | |
415 | #endif | |
416 | ||
a254129e JK |
417 | /** |
418 | * cma_alloc() - allocate pages from contiguous area | |
419 | * @cma: Contiguous memory region for which the allocation is performed. | |
420 | * @count: Requested number of pages. | |
421 | * @align: Requested alignment of pages (in PAGE_SIZE order). | |
65182029 | 422 | * @no_warn: Avoid printing message about failed allocation |
a254129e JK |
423 | * |
424 | * This function allocates part of contiguous memory on specific | |
425 | * contiguous memory area. | |
426 | */ | |
e2f466e3 | 427 | struct page *cma_alloc(struct cma *cma, size_t count, unsigned int align, |
65182029 | 428 | bool no_warn) |
a254129e | 429 | { |
3acaea68 AM |
430 | unsigned long mask, offset; |
431 | unsigned long pfn = -1; | |
432 | unsigned long start = 0; | |
a254129e | 433 | unsigned long bitmap_maxno, bitmap_no, bitmap_count; |
2813b9c0 | 434 | size_t i; |
a254129e | 435 | struct page *page = NULL; |
dbe43d4d | 436 | int ret = -ENOMEM; |
a254129e | 437 | |
835832ba | 438 | if (!cma || !cma->count || !cma->bitmap) |
a254129e JK |
439 | return NULL; |
440 | ||
67a2e213 | 441 | pr_debug("%s(cma %p, count %zu, align %d)\n", __func__, (void *)cma, |
a254129e JK |
442 | count, align); |
443 | ||
444 | if (!count) | |
445 | return NULL; | |
446 | ||
447 | mask = cma_bitmap_aligned_mask(cma, align); | |
b5be83e3 | 448 | offset = cma_bitmap_aligned_offset(cma, align); |
a254129e JK |
449 | bitmap_maxno = cma_bitmap_maxno(cma); |
450 | bitmap_count = cma_bitmap_pages_to_bits(cma, count); | |
451 | ||
6b36ba59 SH |
452 | if (bitmap_count > bitmap_maxno) |
453 | return NULL; | |
454 | ||
a254129e JK |
455 | for (;;) { |
456 | mutex_lock(&cma->lock); | |
b5be83e3 GF |
457 | bitmap_no = bitmap_find_next_zero_area_off(cma->bitmap, |
458 | bitmap_maxno, start, bitmap_count, mask, | |
459 | offset); | |
a254129e JK |
460 | if (bitmap_no >= bitmap_maxno) { |
461 | mutex_unlock(&cma->lock); | |
462 | break; | |
463 | } | |
464 | bitmap_set(cma->bitmap, bitmap_no, bitmap_count); | |
465 | /* | |
466 | * It's safe to drop the lock here. We've marked this region for | |
467 | * our exclusive use. If the migration fails we will take the | |
468 | * lock again and unmark it. | |
469 | */ | |
470 | mutex_unlock(&cma->lock); | |
471 | ||
472 | pfn = cma->base_pfn + (bitmap_no << cma->order_per_bit); | |
ca96b625 | 473 | ret = alloc_contig_range(pfn, pfn + count, MIGRATE_CMA, |
65182029 | 474 | GFP_KERNEL | (no_warn ? __GFP_NOWARN : 0)); |
a4efc174 | 475 | |
a254129e JK |
476 | if (ret == 0) { |
477 | page = pfn_to_page(pfn); | |
478 | break; | |
a254129e | 479 | } |
b7155e76 | 480 | |
a254129e | 481 | cma_clear_bitmap(cma, pfn, count); |
b7155e76 JK |
482 | if (ret != -EBUSY) |
483 | break; | |
484 | ||
a254129e JK |
485 | pr_debug("%s(): memory range at %p is busy, retrying\n", |
486 | __func__, pfn_to_page(pfn)); | |
487 | /* try again with a bit different memory target */ | |
488 | start = bitmap_no + mask + 1; | |
489 | } | |
490 | ||
3acaea68 | 491 | trace_cma_alloc(pfn, page, count, align); |
99e8ea6c | 492 | |
2813b9c0 AK |
493 | /* |
494 | * CMA can allocate multiple page blocks, which results in different | |
495 | * blocks being marked with different tags. Reset the tags to ignore | |
496 | * those page blocks. | |
497 | */ | |
498 | if (page) { | |
499 | for (i = 0; i < count; i++) | |
500 | page_kasan_tag_reset(page + i); | |
501 | } | |
502 | ||
65182029 | 503 | if (ret && !no_warn) { |
5984af10 | 504 | pr_err("%s: alloc failed, req-size: %zu pages, ret: %d\n", |
dbe43d4d JK |
505 | __func__, count, ret); |
506 | cma_debug_show_areas(cma); | |
507 | } | |
508 | ||
a254129e JK |
509 | pr_debug("%s(): returned %p\n", __func__, page); |
510 | return page; | |
511 | } | |
512 | ||
513 | /** | |
514 | * cma_release() - release allocated pages | |
515 | * @cma: Contiguous memory region for which the allocation is performed. | |
516 | * @pages: Allocated pages. | |
517 | * @count: Number of allocated pages. | |
518 | * | |
929f92f7 | 519 | * This function releases memory allocated by cma_alloc(). |
a254129e JK |
520 | * It returns false when provided pages do not belong to contiguous area and |
521 | * true otherwise. | |
522 | */ | |
ac173824 | 523 | bool cma_release(struct cma *cma, const struct page *pages, unsigned int count) |
a254129e JK |
524 | { |
525 | unsigned long pfn; | |
526 | ||
527 | if (!cma || !pages) | |
528 | return false; | |
529 | ||
b8ca396f | 530 | pr_debug("%s(page %p, count %u)\n", __func__, (void *)pages, count); |
a254129e JK |
531 | |
532 | pfn = page_to_pfn(pages); | |
533 | ||
534 | if (pfn < cma->base_pfn || pfn >= cma->base_pfn + cma->count) | |
535 | return false; | |
536 | ||
537 | VM_BUG_ON(pfn + count > cma->base_pfn + cma->count); | |
538 | ||
539 | free_contig_range(pfn, count); | |
540 | cma_clear_bitmap(cma, pfn, count); | |
99e8ea6c | 541 | trace_cma_release(pfn, pages, count); |
a254129e JK |
542 | |
543 | return true; | |
544 | } | |
e4231bcd LA |
545 | |
546 | int cma_for_each_area(int (*it)(struct cma *cma, void *data), void *data) | |
547 | { | |
548 | int i; | |
549 | ||
550 | for (i = 0; i < cma_area_count; i++) { | |
551 | int ret = it(&cma_areas[i], data); | |
552 | ||
553 | if (ret) | |
554 | return ret; | |
555 | } | |
556 | ||
557 | return 0; | |
558 | } |