blob: c0da318c020e6c6d666ac8cf7cb92b2d4a47ceae [file] [log] [blame]
Joonsoo Kima2541292014-08-06 16:05:25 -07001/*
2 * Contiguous Memory Allocator
3 *
4 * Copyright (c) 2010-2011 by Samsung Electronics.
5 * Copyright IBM Corporation, 2013
6 * Copyright LG Electronics Inc., 2014
7 * Written by:
8 * Marek Szyprowski <m.szyprowski@samsung.com>
9 * Michal Nazarewicz <mina86@mina86.com>
10 * Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
11 * Joonsoo Kim <iamjoonsoo.kim@lge.com>
12 *
13 * This program is free software; you can redistribute it and/or
14 * modify it under the terms of the GNU General Public License as
15 * published by the Free Software Foundation; either version 2 of the
16 * License or (at your optional) any later version of the license.
17 */
18
19#define pr_fmt(fmt) "cma: " fmt
20
21#ifdef CONFIG_CMA_DEBUG
22#ifndef DEBUG
23# define DEBUG
24#endif
25#endif
Stefan Strogin99e8ea62015-04-15 16:14:50 -070026#define CREATE_TRACE_POINTS
Joonsoo Kima2541292014-08-06 16:05:25 -070027
28#include <linux/memblock.h>
29#include <linux/err.h>
30#include <linux/mm.h>
31#include <linux/mutex.h>
32#include <linux/sizes.h>
33#include <linux/slab.h>
34#include <linux/log2.h>
35#include <linux/cma.h>
Marek Szyprowskif7426b92014-10-09 15:26:47 -070036#include <linux/highmem.h>
Thierry Reding620951e2014-12-12 16:58:31 -080037#include <linux/io.h>
Stefan Strogin99e8ea62015-04-15 16:14:50 -070038#include <trace/events/cma.h>
Joonsoo Kima2541292014-08-06 16:05:25 -070039
Sasha Levin28b24c12015-04-14 15:44:57 -070040#include "cma.h"
Joonsoo Kima2541292014-08-06 16:05:25 -070041
Sasha Levin28b24c12015-04-14 15:44:57 -070042struct cma cma_areas[MAX_CMA_AREAS];
43unsigned cma_area_count;
Joonsoo Kima2541292014-08-06 16:05:25 -070044static DEFINE_MUTEX(cma_mutex);
45
Sasha Levinac173822015-04-14 15:47:04 -070046phys_addr_t cma_get_base(const struct cma *cma)
Joonsoo Kima2541292014-08-06 16:05:25 -070047{
48 return PFN_PHYS(cma->base_pfn);
49}
50
Sasha Levinac173822015-04-14 15:47:04 -070051unsigned long cma_get_size(const struct cma *cma)
Joonsoo Kima2541292014-08-06 16:05:25 -070052{
53 return cma->count << PAGE_SHIFT;
54}
55
Laura Abbottf318dd02017-04-18 11:27:03 -070056const char *cma_get_name(const struct cma *cma)
57{
58 return cma->name ? cma->name : "(undefined)";
59}
60
Sasha Levinac173822015-04-14 15:47:04 -070061static unsigned long cma_bitmap_aligned_mask(const struct cma *cma,
Doug Bergere048cb32017-07-10 15:49:44 -070062 unsigned int align_order)
Joonsoo Kima2541292014-08-06 16:05:25 -070063{
Weijie Yang68faed62014-10-13 15:51:03 -070064 if (align_order <= cma->order_per_bit)
65 return 0;
66 return (1UL << (align_order - cma->order_per_bit)) - 1;
Joonsoo Kima2541292014-08-06 16:05:25 -070067}
68
Danesh Petigara850fc432015-03-12 16:25:57 -070069/*
Doug Bergere048cb32017-07-10 15:49:44 -070070 * Find the offset of the base PFN from the specified align_order.
71 * The value returned is represented in order_per_bits.
Danesh Petigara850fc432015-03-12 16:25:57 -070072 */
Sasha Levinac173822015-04-14 15:47:04 -070073static unsigned long cma_bitmap_aligned_offset(const struct cma *cma,
Doug Bergere048cb32017-07-10 15:49:44 -070074 unsigned int align_order)
Gregory Fongb5be83e2014-12-12 16:54:48 -080075{
Doug Bergere048cb32017-07-10 15:49:44 -070076 return (cma->base_pfn & ((1UL << align_order) - 1))
77 >> cma->order_per_bit;
Gregory Fongb5be83e2014-12-12 16:54:48 -080078}
79
Sasha Levinac173822015-04-14 15:47:04 -070080static unsigned long cma_bitmap_pages_to_bits(const struct cma *cma,
81 unsigned long pages)
Joonsoo Kima2541292014-08-06 16:05:25 -070082{
83 return ALIGN(pages, 1UL << cma->order_per_bit) >> cma->order_per_bit;
84}
85
Sasha Levinac173822015-04-14 15:47:04 -070086static void cma_clear_bitmap(struct cma *cma, unsigned long pfn,
87 unsigned int count)
Joonsoo Kima2541292014-08-06 16:05:25 -070088{
89 unsigned long bitmap_no, bitmap_count;
90
91 bitmap_no = (pfn - cma->base_pfn) >> cma->order_per_bit;
92 bitmap_count = cma_bitmap_pages_to_bits(cma, count);
93
94 mutex_lock(&cma->lock);
95 bitmap_clear(cma->bitmap, bitmap_no, bitmap_count);
96 mutex_unlock(&cma->lock);
97}
98
99static int __init cma_activate_area(struct cma *cma)
100{
101 int bitmap_size = BITS_TO_LONGS(cma_bitmap_maxno(cma)) * sizeof(long);
102 unsigned long base_pfn = cma->base_pfn, pfn = base_pfn;
103 unsigned i = cma->count >> pageblock_order;
104 struct zone *zone;
105
106 cma->bitmap = kzalloc(bitmap_size, GFP_KERNEL);
107
108 if (!cma->bitmap)
109 return -ENOMEM;
110
111 WARN_ON_ONCE(!pfn_valid(pfn));
112 zone = page_zone(pfn_to_page(pfn));
113
114 do {
115 unsigned j;
116
117 base_pfn = pfn;
118 for (j = pageblock_nr_pages; j; --j, pfn++) {
119 WARN_ON_ONCE(!pfn_valid(pfn));
120 /*
121 * alloc_contig_range requires the pfn range
122 * specified to be in the same zone. Make this
123 * simple by forcing the entire CMA resv range
124 * to be in the same zone.
125 */
126 if (page_zone(pfn_to_page(pfn)) != zone)
Anshuman Khanduale35ef632017-07-10 15:48:12 -0700127 goto not_in_zone;
Joonsoo Kima2541292014-08-06 16:05:25 -0700128 }
129 init_cma_reserved_pageblock(pfn_to_page(base_pfn));
130 } while (--i);
131
132 mutex_init(&cma->lock);
Sasha Levin26b02a12015-04-14 15:44:59 -0700133
134#ifdef CONFIG_CMA_DEBUGFS
135 INIT_HLIST_HEAD(&cma->mem_head);
136 spin_lock_init(&cma->mem_head_lock);
137#endif
138
Joonsoo Kima2541292014-08-06 16:05:25 -0700139 return 0;
140
Anshuman Khanduale35ef632017-07-10 15:48:12 -0700141not_in_zone:
142 pr_err("CMA area %s could not be activated\n", cma->name);
Joonsoo Kima2541292014-08-06 16:05:25 -0700143 kfree(cma->bitmap);
Laurent Pinchartf022d8c2014-10-24 13:18:39 +0300144 cma->count = 0;
Joonsoo Kima2541292014-08-06 16:05:25 -0700145 return -EINVAL;
146}
147
148static int __init cma_init_reserved_areas(void)
149{
150 int i;
151
152 for (i = 0; i < cma_area_count; i++) {
153 int ret = cma_activate_area(&cma_areas[i]);
154
155 if (ret)
156 return ret;
157 }
158
159 return 0;
160}
161core_initcall(cma_init_reserved_areas);
162
163/**
Marek Szyprowskide9e14e2014-10-13 15:51:09 -0700164 * cma_init_reserved_mem() - create custom contiguous area from reserved memory
165 * @base: Base address of the reserved area
166 * @size: Size of the reserved area (in bytes),
167 * @order_per_bit: Order of pages represented by one bit on bitmap.
168 * @res_cma: Pointer to store the created cma region.
169 *
170 * This function creates custom contiguous area from already reserved memory.
171 */
172int __init cma_init_reserved_mem(phys_addr_t base, phys_addr_t size,
Sasha Levinac173822015-04-14 15:47:04 -0700173 unsigned int order_per_bit,
Laura Abbottf318dd02017-04-18 11:27:03 -0700174 const char *name,
Sasha Levinac173822015-04-14 15:47:04 -0700175 struct cma **res_cma)
Marek Szyprowskide9e14e2014-10-13 15:51:09 -0700176{
177 struct cma *cma;
178 phys_addr_t alignment;
179
180 /* Sanity checks */
181 if (cma_area_count == ARRAY_SIZE(cma_areas)) {
182 pr_err("Not enough slots for CMA reserved regions!\n");
183 return -ENOSPC;
184 }
185
186 if (!size || !memblock_is_region_reserved(base, size))
187 return -EINVAL;
188
Shailendra Verma0f96ae22015-06-24 16:58:03 -0700189 /* ensure minimal alignment required by mm core */
Stephen Rothwellbadbda52016-05-27 14:27:41 -0700190 alignment = PAGE_SIZE <<
191 max_t(unsigned long, MAX_ORDER - 1, pageblock_order);
Marek Szyprowskide9e14e2014-10-13 15:51:09 -0700192
193 /* alignment should be aligned with order_per_bit */
194 if (!IS_ALIGNED(alignment >> PAGE_SHIFT, 1 << order_per_bit))
195 return -EINVAL;
196
197 if (ALIGN(base, alignment) != base || ALIGN(size, alignment) != size)
198 return -EINVAL;
199
200 /*
201 * Each reserved area must be initialised later, when more kernel
202 * subsystems (like slab allocator) are available.
203 */
204 cma = &cma_areas[cma_area_count];
Laura Abbottf318dd02017-04-18 11:27:03 -0700205 if (name) {
206 cma->name = name;
207 } else {
208 cma->name = kasprintf(GFP_KERNEL, "cma%d\n", cma_area_count);
209 if (!cma->name)
210 return -ENOMEM;
211 }
Marek Szyprowskide9e14e2014-10-13 15:51:09 -0700212 cma->base_pfn = PFN_DOWN(base);
213 cma->count = size >> PAGE_SHIFT;
214 cma->order_per_bit = order_per_bit;
215 *res_cma = cma;
216 cma_area_count++;
George G. Davis94737a82015-02-11 15:26:27 -0800217 totalcma_pages += (size / PAGE_SIZE);
Marek Szyprowskide9e14e2014-10-13 15:51:09 -0700218
219 return 0;
220}
221
222/**
Joonsoo Kima2541292014-08-06 16:05:25 -0700223 * cma_declare_contiguous() - reserve custom contiguous area
Joonsoo Kima2541292014-08-06 16:05:25 -0700224 * @base: Base address of the reserved area optional, use 0 for any
Joonsoo Kimc1f733a2014-08-06 16:05:32 -0700225 * @size: Size of the reserved area (in bytes),
Joonsoo Kima2541292014-08-06 16:05:25 -0700226 * @limit: End address of the reserved memory (optional, 0 for any).
227 * @alignment: Alignment for the CMA area, should be power of 2 or zero
228 * @order_per_bit: Order of pages represented by one bit on bitmap.
Joonsoo Kima2541292014-08-06 16:05:25 -0700229 * @fixed: hint about where to place the reserved area
Joonsoo Kimc1f733a2014-08-06 16:05:32 -0700230 * @res_cma: Pointer to store the created cma region.
Joonsoo Kima2541292014-08-06 16:05:25 -0700231 *
232 * This function reserves memory from early allocator. It should be
233 * called by arch specific code once the early allocator (memblock or bootmem)
234 * has been activated and all other subsystems have already allocated/reserved
235 * memory. This function allows to create custom reserved areas.
236 *
237 * If @fixed is true, reserve contiguous area at exactly @base. If false,
238 * reserve in range from @base to @limit.
239 */
Joonsoo Kimc1f733a2014-08-06 16:05:32 -0700240int __init cma_declare_contiguous(phys_addr_t base,
241 phys_addr_t size, phys_addr_t limit,
Joonsoo Kima2541292014-08-06 16:05:25 -0700242 phys_addr_t alignment, unsigned int order_per_bit,
Laura Abbottf318dd02017-04-18 11:27:03 -0700243 bool fixed, const char *name, struct cma **res_cma)
Joonsoo Kima2541292014-08-06 16:05:25 -0700244{
Marek Szyprowskif7426b92014-10-09 15:26:47 -0700245 phys_addr_t memblock_end = memblock_end_of_DRAM();
Joonsoo Kim6b101e22014-12-10 15:41:12 -0800246 phys_addr_t highmem_start;
Joonsoo Kima2541292014-08-06 16:05:25 -0700247 int ret = 0;
248
Joonsoo Kim6b101e22014-12-10 15:41:12 -0800249 /*
Laura Abbott2dece442017-01-10 13:35:41 -0800250 * We can't use __pa(high_memory) directly, since high_memory
251 * isn't a valid direct map VA, and DEBUG_VIRTUAL will (validly)
252 * complain. Find the boundary by adding one to the last valid
253 * address.
Joonsoo Kim6b101e22014-12-10 15:41:12 -0800254 */
Laura Abbott2dece442017-01-10 13:35:41 -0800255 highmem_start = __pa(high_memory - 1) + 1;
Laurent Pinchart56fa4f62014-10-24 13:18:42 +0300256 pr_debug("%s(size %pa, base %pa, limit %pa alignment %pa)\n",
257 __func__, &size, &base, &limit, &alignment);
Joonsoo Kima2541292014-08-06 16:05:25 -0700258
259 if (cma_area_count == ARRAY_SIZE(cma_areas)) {
260 pr_err("Not enough slots for CMA reserved regions!\n");
261 return -ENOSPC;
262 }
263
264 if (!size)
265 return -EINVAL;
266
267 if (alignment && !is_power_of_2(alignment))
268 return -EINVAL;
269
270 /*
271 * Sanitise input arguments.
272 * Pages both ends in CMA area could be merged into adjacent unmovable
273 * migratetype page by page allocator's buddy algorithm. In the case,
274 * you couldn't get a contiguous memory, which is not what we want.
275 */
Stephen Rothwellbadbda52016-05-27 14:27:41 -0700276 alignment = max(alignment, (phys_addr_t)PAGE_SIZE <<
277 max_t(unsigned long, MAX_ORDER - 1, pageblock_order));
Joonsoo Kima2541292014-08-06 16:05:25 -0700278 base = ALIGN(base, alignment);
279 size = ALIGN(size, alignment);
280 limit &= ~(alignment - 1);
281
Laurent Pinchart800a85d2014-10-24 13:18:40 +0300282 if (!base)
283 fixed = false;
284
Joonsoo Kima2541292014-08-06 16:05:25 -0700285 /* size should be aligned with order_per_bit */
286 if (!IS_ALIGNED(size >> PAGE_SHIFT, 1 << order_per_bit))
287 return -EINVAL;
288
Marek Szyprowskif7426b92014-10-09 15:26:47 -0700289 /*
Laurent Pinchart16195dd2014-10-24 13:18:41 +0300290 * If allocating at a fixed base the request region must not cross the
291 * low/high memory boundary.
Marek Szyprowskif7426b92014-10-09 15:26:47 -0700292 */
Laurent Pinchart16195dd2014-10-24 13:18:41 +0300293 if (fixed && base < highmem_start && base + size > highmem_start) {
Marek Szyprowskif7426b92014-10-09 15:26:47 -0700294 ret = -EINVAL;
Laurent Pinchart56fa4f62014-10-24 13:18:42 +0300295 pr_err("Region at %pa defined on low/high memory boundary (%pa)\n",
296 &base, &highmem_start);
Marek Szyprowskif7426b92014-10-09 15:26:47 -0700297 goto err;
298 }
299
Laurent Pinchart16195dd2014-10-24 13:18:41 +0300300 /*
301 * If the limit is unspecified or above the memblock end, its effective
302 * value will be the memblock end. Set it explicitly to simplify further
303 * checks.
304 */
305 if (limit == 0 || limit > memblock_end)
306 limit = memblock_end;
307
Joonsoo Kima2541292014-08-06 16:05:25 -0700308 /* Reserve memory */
Laurent Pinchart800a85d2014-10-24 13:18:40 +0300309 if (fixed) {
Joonsoo Kima2541292014-08-06 16:05:25 -0700310 if (memblock_is_region_reserved(base, size) ||
311 memblock_reserve(base, size) < 0) {
312 ret = -EBUSY;
313 goto err;
314 }
315 } else {
Laurent Pinchart16195dd2014-10-24 13:18:41 +0300316 phys_addr_t addr = 0;
317
318 /*
319 * All pages in the reserved area must come from the same zone.
320 * If the requested region crosses the low/high memory boundary,
321 * try allocating from high memory first and fall back to low
322 * memory in case of failure.
323 */
324 if (base < highmem_start && limit > highmem_start) {
325 addr = memblock_alloc_range(size, alignment,
Tony Luckfc6daaf2015-06-24 16:58:09 -0700326 highmem_start, limit,
327 MEMBLOCK_NONE);
Laurent Pinchart16195dd2014-10-24 13:18:41 +0300328 limit = highmem_start;
Joonsoo Kima2541292014-08-06 16:05:25 -0700329 }
Laurent Pinchart16195dd2014-10-24 13:18:41 +0300330
331 if (!addr) {
332 addr = memblock_alloc_range(size, alignment, base,
Tony Luckfc6daaf2015-06-24 16:58:09 -0700333 limit,
334 MEMBLOCK_NONE);
Laurent Pinchart16195dd2014-10-24 13:18:41 +0300335 if (!addr) {
336 ret = -ENOMEM;
337 goto err;
338 }
339 }
340
Thierry Reding620951e2014-12-12 16:58:31 -0800341 /*
342 * kmemleak scans/reads tracked objects for pointers to other
343 * objects but this address isn't mapped and accessible
344 */
Catalin Marinas9099dae2016-10-11 13:55:11 -0700345 kmemleak_ignore_phys(addr);
Laurent Pinchart16195dd2014-10-24 13:18:41 +0300346 base = addr;
Joonsoo Kima2541292014-08-06 16:05:25 -0700347 }
348
Laura Abbottf318dd02017-04-18 11:27:03 -0700349 ret = cma_init_reserved_mem(base, size, order_per_bit, name, res_cma);
Marek Szyprowskide9e14e2014-10-13 15:51:09 -0700350 if (ret)
351 goto err;
Joonsoo Kima2541292014-08-06 16:05:25 -0700352
Laurent Pinchart56fa4f62014-10-24 13:18:42 +0300353 pr_info("Reserved %ld MiB at %pa\n", (unsigned long)size / SZ_1M,
354 &base);
Joonsoo Kima2541292014-08-06 16:05:25 -0700355 return 0;
356
357err:
Joonsoo Kim0de9d2e2014-08-06 16:05:34 -0700358 pr_err("Failed to reserve %ld MiB\n", (unsigned long)size / SZ_1M);
Joonsoo Kima2541292014-08-06 16:05:25 -0700359 return ret;
360}
361
Jaewon Kimdbe43d42017-02-24 14:58:50 -0800362#ifdef CONFIG_CMA_DEBUG
363static void cma_debug_show_areas(struct cma *cma)
364{
365 unsigned long next_zero_bit, next_set_bit;
366 unsigned long start = 0;
367 unsigned int nr_zero, nr_total = 0;
368
369 mutex_lock(&cma->lock);
370 pr_info("number of available pages: ");
371 for (;;) {
372 next_zero_bit = find_next_zero_bit(cma->bitmap, cma->count, start);
373 if (next_zero_bit >= cma->count)
374 break;
375 next_set_bit = find_next_bit(cma->bitmap, cma->count, next_zero_bit);
376 nr_zero = next_set_bit - next_zero_bit;
377 pr_cont("%s%u@%lu", nr_total ? "+" : "", nr_zero, next_zero_bit);
378 nr_total += nr_zero;
379 start = next_zero_bit + nr_zero;
380 }
381 pr_cont("=> %u free of %lu total pages\n", nr_total, cma->count);
382 mutex_unlock(&cma->lock);
383}
384#else
385static inline void cma_debug_show_areas(struct cma *cma) { }
386#endif
387
Joonsoo Kima2541292014-08-06 16:05:25 -0700388/**
389 * cma_alloc() - allocate pages from contiguous area
390 * @cma: Contiguous memory region for which the allocation is performed.
391 * @count: Requested number of pages.
392 * @align: Requested alignment of pages (in PAGE_SIZE order).
393 *
394 * This function allocates part of contiguous memory on specific
395 * contiguous memory area.
396 */
Lucas Stache2f466e2017-02-24 14:58:41 -0800397struct page *cma_alloc(struct cma *cma, size_t count, unsigned int align,
398 gfp_t gfp_mask)
Joonsoo Kima2541292014-08-06 16:05:25 -0700399{
Andrew Morton3acaea62015-11-05 18:50:08 -0800400 unsigned long mask, offset;
401 unsigned long pfn = -1;
402 unsigned long start = 0;
Joonsoo Kima2541292014-08-06 16:05:25 -0700403 unsigned long bitmap_maxno, bitmap_no, bitmap_count;
404 struct page *page = NULL;
Jaewon Kimdbe43d42017-02-24 14:58:50 -0800405 int ret = -ENOMEM;
Joonsoo Kima2541292014-08-06 16:05:25 -0700406
407 if (!cma || !cma->count)
408 return NULL;
409
Rohit Vaswani67a2e2132015-10-22 13:32:11 -0700410 pr_debug("%s(cma %p, count %zu, align %d)\n", __func__, (void *)cma,
Joonsoo Kima2541292014-08-06 16:05:25 -0700411 count, align);
412
413 if (!count)
414 return NULL;
415
416 mask = cma_bitmap_aligned_mask(cma, align);
Gregory Fongb5be83e2014-12-12 16:54:48 -0800417 offset = cma_bitmap_aligned_offset(cma, align);
Joonsoo Kima2541292014-08-06 16:05:25 -0700418 bitmap_maxno = cma_bitmap_maxno(cma);
419 bitmap_count = cma_bitmap_pages_to_bits(cma, count);
420
Shiraz Hashim6b36ba52016-11-10 10:46:16 -0800421 if (bitmap_count > bitmap_maxno)
422 return NULL;
423
Joonsoo Kima2541292014-08-06 16:05:25 -0700424 for (;;) {
425 mutex_lock(&cma->lock);
Gregory Fongb5be83e2014-12-12 16:54:48 -0800426 bitmap_no = bitmap_find_next_zero_area_off(cma->bitmap,
427 bitmap_maxno, start, bitmap_count, mask,
428 offset);
Joonsoo Kima2541292014-08-06 16:05:25 -0700429 if (bitmap_no >= bitmap_maxno) {
430 mutex_unlock(&cma->lock);
431 break;
432 }
433 bitmap_set(cma->bitmap, bitmap_no, bitmap_count);
434 /*
435 * It's safe to drop the lock here. We've marked this region for
436 * our exclusive use. If the migration fails we will take the
437 * lock again and unmark it.
438 */
439 mutex_unlock(&cma->lock);
440
441 pfn = cma->base_pfn + (bitmap_no << cma->order_per_bit);
442 mutex_lock(&cma_mutex);
Lucas Stachca96b622017-02-24 14:58:37 -0800443 ret = alloc_contig_range(pfn, pfn + count, MIGRATE_CMA,
Lucas Stache2f466e2017-02-24 14:58:41 -0800444 gfp_mask);
Joonsoo Kima2541292014-08-06 16:05:25 -0700445 mutex_unlock(&cma_mutex);
446 if (ret == 0) {
447 page = pfn_to_page(pfn);
448 break;
Joonsoo Kima2541292014-08-06 16:05:25 -0700449 }
Joonsoo Kimb7155e72014-08-06 16:05:30 -0700450
Joonsoo Kima2541292014-08-06 16:05:25 -0700451 cma_clear_bitmap(cma, pfn, count);
Joonsoo Kimb7155e72014-08-06 16:05:30 -0700452 if (ret != -EBUSY)
453 break;
454
Joonsoo Kima2541292014-08-06 16:05:25 -0700455 pr_debug("%s(): memory range at %p is busy, retrying\n",
456 __func__, pfn_to_page(pfn));
457 /* try again with a bit different memory target */
458 start = bitmap_no + mask + 1;
459 }
460
Andrew Morton3acaea62015-11-05 18:50:08 -0800461 trace_cma_alloc(pfn, page, count, align);
Stefan Strogin99e8ea62015-04-15 16:14:50 -0700462
Jaewon Kimdbe43d42017-02-24 14:58:50 -0800463 if (ret) {
464 pr_info("%s: alloc failed, req-size: %zu pages, ret: %d\n",
465 __func__, count, ret);
466 cma_debug_show_areas(cma);
467 }
468
Joonsoo Kima2541292014-08-06 16:05:25 -0700469 pr_debug("%s(): returned %p\n", __func__, page);
470 return page;
471}
472
473/**
474 * cma_release() - release allocated pages
475 * @cma: Contiguous memory region for which the allocation is performed.
476 * @pages: Allocated pages.
477 * @count: Number of allocated pages.
478 *
479 * This function releases memory allocated by alloc_cma().
480 * It returns false when provided pages do not belong to contiguous area and
481 * true otherwise.
482 */
Sasha Levinac173822015-04-14 15:47:04 -0700483bool cma_release(struct cma *cma, const struct page *pages, unsigned int count)
Joonsoo Kima2541292014-08-06 16:05:25 -0700484{
485 unsigned long pfn;
486
487 if (!cma || !pages)
488 return false;
489
490 pr_debug("%s(page %p)\n", __func__, (void *)pages);
491
492 pfn = page_to_pfn(pages);
493
494 if (pfn < cma->base_pfn || pfn >= cma->base_pfn + cma->count)
495 return false;
496
497 VM_BUG_ON(pfn + count > cma->base_pfn + cma->count);
498
499 free_contig_range(pfn, count);
500 cma_clear_bitmap(cma, pfn, count);
Stefan Strogin99e8ea62015-04-15 16:14:50 -0700501 trace_cma_release(pfn, pages, count);
Joonsoo Kima2541292014-08-06 16:05:25 -0700502
503 return true;
504}
Laura Abbotte4231bc2017-04-18 11:27:04 -0700505
506int cma_for_each_area(int (*it)(struct cma *cma, void *data), void *data)
507{
508 int i;
509
510 for (i = 0; i < cma_area_count; i++) {
511 int ret = it(&cma_areas[i], data);
512
513 if (ret)
514 return ret;
515 }
516
517 return 0;
518}