blob: 5809bbe360d7fb724a435309e6e693a98f9efbfb [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>
Randy Dunlap514c6032018-04-05 16:25:34 -070038#include <linux/kmemleak.h>
Stefan Strogin99e8ea62015-04-15 16:14:50 -070039#include <trace/events/cma.h>
Joonsoo Kima2541292014-08-06 16:05:25 -070040
Sasha Levin28b24c12015-04-14 15:44:57 -070041#include "cma.h"
Joonsoo Kima2541292014-08-06 16:05:25 -070042
Sasha Levin28b24c12015-04-14 15:44:57 -070043struct cma cma_areas[MAX_CMA_AREAS];
44unsigned cma_area_count;
Joonsoo Kima2541292014-08-06 16:05:25 -070045static DEFINE_MUTEX(cma_mutex);
46
Sasha Levinac173822015-04-14 15:47:04 -070047phys_addr_t cma_get_base(const struct cma *cma)
Joonsoo Kima2541292014-08-06 16:05:25 -070048{
49 return PFN_PHYS(cma->base_pfn);
50}
51
Sasha Levinac173822015-04-14 15:47:04 -070052unsigned long cma_get_size(const struct cma *cma)
Joonsoo Kima2541292014-08-06 16:05:25 -070053{
54 return cma->count << PAGE_SHIFT;
55}
56
Laura Abbottf318dd02017-04-18 11:27:03 -070057const char *cma_get_name(const struct cma *cma)
58{
59 return cma->name ? cma->name : "(undefined)";
60}
61
Sasha Levinac173822015-04-14 15:47:04 -070062static unsigned long cma_bitmap_aligned_mask(const struct cma *cma,
Doug Bergere048cb32017-07-10 15:49:44 -070063 unsigned int align_order)
Joonsoo Kima2541292014-08-06 16:05:25 -070064{
Weijie Yang68faed62014-10-13 15:51:03 -070065 if (align_order <= cma->order_per_bit)
66 return 0;
67 return (1UL << (align_order - cma->order_per_bit)) - 1;
Joonsoo Kima2541292014-08-06 16:05:25 -070068}
69
Danesh Petigara850fc432015-03-12 16:25:57 -070070/*
Doug Bergere048cb32017-07-10 15:49:44 -070071 * Find the offset of the base PFN from the specified align_order.
72 * The value returned is represented in order_per_bits.
Danesh Petigara850fc432015-03-12 16:25:57 -070073 */
Sasha Levinac173822015-04-14 15:47:04 -070074static unsigned long cma_bitmap_aligned_offset(const struct cma *cma,
Doug Bergere048cb32017-07-10 15:49:44 -070075 unsigned int align_order)
Gregory Fongb5be83e2014-12-12 16:54:48 -080076{
Doug Bergere048cb32017-07-10 15:49:44 -070077 return (cma->base_pfn & ((1UL << align_order) - 1))
78 >> cma->order_per_bit;
Gregory Fongb5be83e2014-12-12 16:54:48 -080079}
80
Sasha Levinac173822015-04-14 15:47:04 -070081static unsigned long cma_bitmap_pages_to_bits(const struct cma *cma,
82 unsigned long pages)
Joonsoo Kima2541292014-08-06 16:05:25 -070083{
84 return ALIGN(pages, 1UL << cma->order_per_bit) >> cma->order_per_bit;
85}
86
Sasha Levinac173822015-04-14 15:47:04 -070087static void cma_clear_bitmap(struct cma *cma, unsigned long pfn,
88 unsigned int count)
Joonsoo Kima2541292014-08-06 16:05:25 -070089{
90 unsigned long bitmap_no, bitmap_count;
91
92 bitmap_no = (pfn - cma->base_pfn) >> cma->order_per_bit;
93 bitmap_count = cma_bitmap_pages_to_bits(cma, count);
94
95 mutex_lock(&cma->lock);
96 bitmap_clear(cma->bitmap, bitmap_no, bitmap_count);
97 mutex_unlock(&cma->lock);
98}
99
100static int __init cma_activate_area(struct cma *cma)
101{
102 int bitmap_size = BITS_TO_LONGS(cma_bitmap_maxno(cma)) * sizeof(long);
103 unsigned long base_pfn = cma->base_pfn, pfn = base_pfn;
104 unsigned i = cma->count >> pageblock_order;
105 struct zone *zone;
106
107 cma->bitmap = kzalloc(bitmap_size, GFP_KERNEL);
108
109 if (!cma->bitmap)
110 return -ENOMEM;
111
Joonsoo Kimd883c6c2018-05-23 10:18:21 +0900112 WARN_ON_ONCE(!pfn_valid(pfn));
113 zone = page_zone(pfn_to_page(pfn));
114
Joonsoo Kima2541292014-08-06 16:05:25 -0700115 do {
116 unsigned j;
117
118 base_pfn = pfn;
119 for (j = pageblock_nr_pages; j; --j, pfn++) {
Joonsoo Kimd883c6c2018-05-23 10:18:21 +0900120 WARN_ON_ONCE(!pfn_valid(pfn));
Joonsoo Kima2541292014-08-06 16:05:25 -0700121 /*
Joonsoo Kimd883c6c2018-05-23 10:18:21 +0900122 * alloc_contig_range requires the pfn range
123 * specified to be in the same zone. Make this
124 * simple by forcing the entire CMA resv range
125 * to be in the same zone.
Joonsoo Kima2541292014-08-06 16:05:25 -0700126 */
127 if (page_zone(pfn_to_page(pfn)) != zone)
Joonsoo Kimd883c6c2018-05-23 10:18:21 +0900128 goto not_in_zone;
Joonsoo Kima2541292014-08-06 16:05:25 -0700129 }
130 init_cma_reserved_pageblock(pfn_to_page(base_pfn));
131 } while (--i);
132
133 mutex_init(&cma->lock);
Sasha Levin26b02a12015-04-14 15:44:59 -0700134
135#ifdef CONFIG_CMA_DEBUGFS
136 INIT_HLIST_HEAD(&cma->mem_head);
137 spin_lock_init(&cma->mem_head_lock);
138#endif
139
Joonsoo Kima2541292014-08-06 16:05:25 -0700140 return 0;
141
Joonsoo Kimd883c6c2018-05-23 10:18:21 +0900142not_in_zone:
Anshuman Khanduale35ef632017-07-10 15:48:12 -0700143 pr_err("CMA area %s could not be activated\n", cma->name);
Joonsoo Kima2541292014-08-06 16:05:25 -0700144 kfree(cma->bitmap);
Laurent Pinchartf022d8c2014-10-24 13:18:39 +0300145 cma->count = 0;
Joonsoo Kima2541292014-08-06 16:05:25 -0700146 return -EINVAL;
147}
148
149static int __init cma_init_reserved_areas(void)
150{
151 int i;
152
153 for (i = 0; i < cma_area_count; i++) {
154 int ret = cma_activate_area(&cma_areas[i]);
155
156 if (ret)
157 return ret;
158 }
159
160 return 0;
161}
Joonsoo Kimd883c6c2018-05-23 10:18:21 +0900162core_initcall(cma_init_reserved_areas);
Joonsoo Kima2541292014-08-06 16:05:25 -0700163
164/**
Marek Szyprowskide9e14e2014-10-13 15:51:09 -0700165 * cma_init_reserved_mem() - create custom contiguous area from reserved memory
166 * @base: Base address of the reserved area
167 * @size: Size of the reserved area (in bytes),
168 * @order_per_bit: Order of pages represented by one bit on bitmap.
Mike Rapoporte8b098f2018-04-05 16:24:57 -0700169 * @name: The name of the area. If this parameter is NULL, the name of
170 * the area will be set to "cmaN", where N is a running counter of
171 * used areas.
Marek Szyprowskide9e14e2014-10-13 15:51:09 -0700172 * @res_cma: Pointer to store the created cma region.
173 *
174 * This function creates custom contiguous area from already reserved memory.
175 */
176int __init cma_init_reserved_mem(phys_addr_t base, phys_addr_t size,
Sasha Levinac173822015-04-14 15:47:04 -0700177 unsigned int order_per_bit,
Laura Abbottf318dd02017-04-18 11:27:03 -0700178 const char *name,
Sasha Levinac173822015-04-14 15:47:04 -0700179 struct cma **res_cma)
Marek Szyprowskide9e14e2014-10-13 15:51:09 -0700180{
181 struct cma *cma;
182 phys_addr_t alignment;
183
184 /* Sanity checks */
185 if (cma_area_count == ARRAY_SIZE(cma_areas)) {
186 pr_err("Not enough slots for CMA reserved regions!\n");
187 return -ENOSPC;
188 }
189
190 if (!size || !memblock_is_region_reserved(base, size))
191 return -EINVAL;
192
Shailendra Verma0f96ae22015-06-24 16:58:03 -0700193 /* ensure minimal alignment required by mm core */
Stephen Rothwellbadbda52016-05-27 14:27:41 -0700194 alignment = PAGE_SIZE <<
195 max_t(unsigned long, MAX_ORDER - 1, pageblock_order);
Marek Szyprowskide9e14e2014-10-13 15:51:09 -0700196
197 /* alignment should be aligned with order_per_bit */
198 if (!IS_ALIGNED(alignment >> PAGE_SHIFT, 1 << order_per_bit))
199 return -EINVAL;
200
201 if (ALIGN(base, alignment) != base || ALIGN(size, alignment) != size)
202 return -EINVAL;
203
204 /*
205 * Each reserved area must be initialised later, when more kernel
206 * subsystems (like slab allocator) are available.
207 */
208 cma = &cma_areas[cma_area_count];
Laura Abbottf318dd02017-04-18 11:27:03 -0700209 if (name) {
210 cma->name = name;
211 } else {
212 cma->name = kasprintf(GFP_KERNEL, "cma%d\n", cma_area_count);
213 if (!cma->name)
214 return -ENOMEM;
215 }
Marek Szyprowskide9e14e2014-10-13 15:51:09 -0700216 cma->base_pfn = PFN_DOWN(base);
217 cma->count = size >> PAGE_SHIFT;
218 cma->order_per_bit = order_per_bit;
219 *res_cma = cma;
220 cma_area_count++;
George G. Davis94737a82015-02-11 15:26:27 -0800221 totalcma_pages += (size / PAGE_SIZE);
Marek Szyprowskide9e14e2014-10-13 15:51:09 -0700222
223 return 0;
224}
225
226/**
Joonsoo Kima2541292014-08-06 16:05:25 -0700227 * cma_declare_contiguous() - reserve custom contiguous area
Joonsoo Kima2541292014-08-06 16:05:25 -0700228 * @base: Base address of the reserved area optional, use 0 for any
Joonsoo Kimc1f733aa2014-08-06 16:05:32 -0700229 * @size: Size of the reserved area (in bytes),
Joonsoo Kima2541292014-08-06 16:05:25 -0700230 * @limit: End address of the reserved memory (optional, 0 for any).
231 * @alignment: Alignment for the CMA area, should be power of 2 or zero
232 * @order_per_bit: Order of pages represented by one bit on bitmap.
Joonsoo Kima2541292014-08-06 16:05:25 -0700233 * @fixed: hint about where to place the reserved area
Mike Rapoporte8b098f2018-04-05 16:24:57 -0700234 * @name: The name of the area. See function cma_init_reserved_mem()
Joonsoo Kimc1f733aa2014-08-06 16:05:32 -0700235 * @res_cma: Pointer to store the created cma region.
Joonsoo Kima2541292014-08-06 16:05:25 -0700236 *
237 * This function reserves memory from early allocator. It should be
238 * called by arch specific code once the early allocator (memblock or bootmem)
239 * has been activated and all other subsystems have already allocated/reserved
240 * memory. This function allows to create custom reserved areas.
241 *
242 * If @fixed is true, reserve contiguous area at exactly @base. If false,
243 * reserve in range from @base to @limit.
244 */
Joonsoo Kimc1f733aa2014-08-06 16:05:32 -0700245int __init cma_declare_contiguous(phys_addr_t base,
246 phys_addr_t size, phys_addr_t limit,
Joonsoo Kima2541292014-08-06 16:05:25 -0700247 phys_addr_t alignment, unsigned int order_per_bit,
Laura Abbottf318dd02017-04-18 11:27:03 -0700248 bool fixed, const char *name, struct cma **res_cma)
Joonsoo Kima2541292014-08-06 16:05:25 -0700249{
Marek Szyprowskif7426b92014-10-09 15:26:47 -0700250 phys_addr_t memblock_end = memblock_end_of_DRAM();
Joonsoo Kim6b101e22014-12-10 15:41:12 -0800251 phys_addr_t highmem_start;
Joonsoo Kima2541292014-08-06 16:05:25 -0700252 int ret = 0;
253
Joonsoo Kim6b101e22014-12-10 15:41:12 -0800254 /*
Laura Abbott2dece442017-01-10 13:35:41 -0800255 * We can't use __pa(high_memory) directly, since high_memory
256 * isn't a valid direct map VA, and DEBUG_VIRTUAL will (validly)
257 * complain. Find the boundary by adding one to the last valid
258 * address.
Joonsoo Kim6b101e22014-12-10 15:41:12 -0800259 */
Laura Abbott2dece442017-01-10 13:35:41 -0800260 highmem_start = __pa(high_memory - 1) + 1;
Laurent Pinchart56fa4f62014-10-24 13:18:42 +0300261 pr_debug("%s(size %pa, base %pa, limit %pa alignment %pa)\n",
262 __func__, &size, &base, &limit, &alignment);
Joonsoo Kima2541292014-08-06 16:05:25 -0700263
264 if (cma_area_count == ARRAY_SIZE(cma_areas)) {
265 pr_err("Not enough slots for CMA reserved regions!\n");
266 return -ENOSPC;
267 }
268
269 if (!size)
270 return -EINVAL;
271
272 if (alignment && !is_power_of_2(alignment))
273 return -EINVAL;
274
275 /*
276 * Sanitise input arguments.
277 * Pages both ends in CMA area could be merged into adjacent unmovable
278 * migratetype page by page allocator's buddy algorithm. In the case,
279 * you couldn't get a contiguous memory, which is not what we want.
280 */
Stephen Rothwellbadbda52016-05-27 14:27:41 -0700281 alignment = max(alignment, (phys_addr_t)PAGE_SIZE <<
282 max_t(unsigned long, MAX_ORDER - 1, pageblock_order));
Joonsoo Kima2541292014-08-06 16:05:25 -0700283 base = ALIGN(base, alignment);
284 size = ALIGN(size, alignment);
285 limit &= ~(alignment - 1);
286
Laurent Pinchart800a85d2014-10-24 13:18:40 +0300287 if (!base)
288 fixed = false;
289
Joonsoo Kima2541292014-08-06 16:05:25 -0700290 /* size should be aligned with order_per_bit */
291 if (!IS_ALIGNED(size >> PAGE_SHIFT, 1 << order_per_bit))
292 return -EINVAL;
293
Marek Szyprowskif7426b92014-10-09 15:26:47 -0700294 /*
Laurent Pinchart16195dd2014-10-24 13:18:41 +0300295 * If allocating at a fixed base the request region must not cross the
296 * low/high memory boundary.
Marek Szyprowskif7426b92014-10-09 15:26:47 -0700297 */
Laurent Pinchart16195dd2014-10-24 13:18:41 +0300298 if (fixed && base < highmem_start && base + size > highmem_start) {
Marek Szyprowskif7426b92014-10-09 15:26:47 -0700299 ret = -EINVAL;
Laurent Pinchart56fa4f62014-10-24 13:18:42 +0300300 pr_err("Region at %pa defined on low/high memory boundary (%pa)\n",
301 &base, &highmem_start);
Marek Szyprowskif7426b92014-10-09 15:26:47 -0700302 goto err;
303 }
304
Laurent Pinchart16195dd2014-10-24 13:18:41 +0300305 /*
306 * If the limit is unspecified or above the memblock end, its effective
307 * value will be the memblock end. Set it explicitly to simplify further
308 * checks.
309 */
310 if (limit == 0 || limit > memblock_end)
311 limit = memblock_end;
312
Joonsoo Kima2541292014-08-06 16:05:25 -0700313 /* Reserve memory */
Laurent Pinchart800a85d2014-10-24 13:18:40 +0300314 if (fixed) {
Joonsoo Kima2541292014-08-06 16:05:25 -0700315 if (memblock_is_region_reserved(base, size) ||
316 memblock_reserve(base, size) < 0) {
317 ret = -EBUSY;
318 goto err;
319 }
320 } else {
Laurent Pinchart16195dd2014-10-24 13:18:41 +0300321 phys_addr_t addr = 0;
322
323 /*
324 * All pages in the reserved area must come from the same zone.
325 * If the requested region crosses the low/high memory boundary,
326 * try allocating from high memory first and fall back to low
327 * memory in case of failure.
328 */
329 if (base < highmem_start && limit > highmem_start) {
330 addr = memblock_alloc_range(size, alignment,
Tony Luckfc6daaf2015-06-24 16:58:09 -0700331 highmem_start, limit,
332 MEMBLOCK_NONE);
Laurent Pinchart16195dd2014-10-24 13:18:41 +0300333 limit = highmem_start;
Joonsoo Kima2541292014-08-06 16:05:25 -0700334 }
Laurent Pinchart16195dd2014-10-24 13:18:41 +0300335
336 if (!addr) {
337 addr = memblock_alloc_range(size, alignment, base,
Tony Luckfc6daaf2015-06-24 16:58:09 -0700338 limit,
339 MEMBLOCK_NONE);
Laurent Pinchart16195dd2014-10-24 13:18:41 +0300340 if (!addr) {
341 ret = -ENOMEM;
342 goto err;
343 }
344 }
345
Thierry Reding620951e2014-12-12 16:58:31 -0800346 /*
347 * kmemleak scans/reads tracked objects for pointers to other
348 * objects but this address isn't mapped and accessible
349 */
Catalin Marinas9099dae2016-10-11 13:55:11 -0700350 kmemleak_ignore_phys(addr);
Laurent Pinchart16195dd2014-10-24 13:18:41 +0300351 base = addr;
Joonsoo Kima2541292014-08-06 16:05:25 -0700352 }
353
Laura Abbottf318dd02017-04-18 11:27:03 -0700354 ret = cma_init_reserved_mem(base, size, order_per_bit, name, res_cma);
Marek Szyprowskide9e14e2014-10-13 15:51:09 -0700355 if (ret)
356 goto err;
Joonsoo Kima2541292014-08-06 16:05:25 -0700357
Laurent Pinchart56fa4f62014-10-24 13:18:42 +0300358 pr_info("Reserved %ld MiB at %pa\n", (unsigned long)size / SZ_1M,
359 &base);
Joonsoo Kima2541292014-08-06 16:05:25 -0700360 return 0;
361
362err:
Joonsoo Kim0de9d2e2014-08-06 16:05:34 -0700363 pr_err("Failed to reserve %ld MiB\n", (unsigned long)size / SZ_1M);
Joonsoo Kima2541292014-08-06 16:05:25 -0700364 return ret;
365}
366
Jaewon Kimdbe43d42017-02-24 14:58:50 -0800367#ifdef CONFIG_CMA_DEBUG
368static void cma_debug_show_areas(struct cma *cma)
369{
370 unsigned long next_zero_bit, next_set_bit;
371 unsigned long start = 0;
372 unsigned int nr_zero, nr_total = 0;
373
374 mutex_lock(&cma->lock);
375 pr_info("number of available pages: ");
376 for (;;) {
377 next_zero_bit = find_next_zero_bit(cma->bitmap, cma->count, start);
378 if (next_zero_bit >= cma->count)
379 break;
380 next_set_bit = find_next_bit(cma->bitmap, cma->count, next_zero_bit);
381 nr_zero = next_set_bit - next_zero_bit;
382 pr_cont("%s%u@%lu", nr_total ? "+" : "", nr_zero, next_zero_bit);
383 nr_total += nr_zero;
384 start = next_zero_bit + nr_zero;
385 }
386 pr_cont("=> %u free of %lu total pages\n", nr_total, cma->count);
387 mutex_unlock(&cma->lock);
388}
389#else
390static inline void cma_debug_show_areas(struct cma *cma) { }
391#endif
392
Joonsoo Kima2541292014-08-06 16:05:25 -0700393/**
394 * cma_alloc() - allocate pages from contiguous area
395 * @cma: Contiguous memory region for which the allocation is performed.
396 * @count: Requested number of pages.
397 * @align: Requested alignment of pages (in PAGE_SIZE order).
Mike Rapoporte8b098f2018-04-05 16:24:57 -0700398 * @gfp_mask: GFP mask to use during compaction
Joonsoo Kima2541292014-08-06 16:05:25 -0700399 *
400 * This function allocates part of contiguous memory on specific
401 * contiguous memory area.
402 */
Lucas Stache2f466e2017-02-24 14:58:41 -0800403struct page *cma_alloc(struct cma *cma, size_t count, unsigned int align,
404 gfp_t gfp_mask)
Joonsoo Kima2541292014-08-06 16:05:25 -0700405{
Andrew Morton3acaea62015-11-05 18:50:08 -0800406 unsigned long mask, offset;
407 unsigned long pfn = -1;
408 unsigned long start = 0;
Joonsoo Kima2541292014-08-06 16:05:25 -0700409 unsigned long bitmap_maxno, bitmap_no, bitmap_count;
410 struct page *page = NULL;
Jaewon Kimdbe43d42017-02-24 14:58:50 -0800411 int ret = -ENOMEM;
Joonsoo Kima2541292014-08-06 16:05:25 -0700412
413 if (!cma || !cma->count)
414 return NULL;
415
Rohit Vaswani67a2e2132015-10-22 13:32:11 -0700416 pr_debug("%s(cma %p, count %zu, align %d)\n", __func__, (void *)cma,
Joonsoo Kima2541292014-08-06 16:05:25 -0700417 count, align);
418
419 if (!count)
420 return NULL;
421
422 mask = cma_bitmap_aligned_mask(cma, align);
Gregory Fongb5be83e2014-12-12 16:54:48 -0800423 offset = cma_bitmap_aligned_offset(cma, align);
Joonsoo Kima2541292014-08-06 16:05:25 -0700424 bitmap_maxno = cma_bitmap_maxno(cma);
425 bitmap_count = cma_bitmap_pages_to_bits(cma, count);
426
Shiraz Hashim6b36ba52016-11-10 10:46:16 -0800427 if (bitmap_count > bitmap_maxno)
428 return NULL;
429
Joonsoo Kima2541292014-08-06 16:05:25 -0700430 for (;;) {
431 mutex_lock(&cma->lock);
Gregory Fongb5be83e2014-12-12 16:54:48 -0800432 bitmap_no = bitmap_find_next_zero_area_off(cma->bitmap,
433 bitmap_maxno, start, bitmap_count, mask,
434 offset);
Joonsoo Kima2541292014-08-06 16:05:25 -0700435 if (bitmap_no >= bitmap_maxno) {
436 mutex_unlock(&cma->lock);
437 break;
438 }
439 bitmap_set(cma->bitmap, bitmap_no, bitmap_count);
440 /*
441 * It's safe to drop the lock here. We've marked this region for
442 * our exclusive use. If the migration fails we will take the
443 * lock again and unmark it.
444 */
445 mutex_unlock(&cma->lock);
446
447 pfn = cma->base_pfn + (bitmap_no << cma->order_per_bit);
448 mutex_lock(&cma_mutex);
Lucas Stachca96b622017-02-24 14:58:37 -0800449 ret = alloc_contig_range(pfn, pfn + count, MIGRATE_CMA,
Lucas Stache2f466e2017-02-24 14:58:41 -0800450 gfp_mask);
Joonsoo Kima2541292014-08-06 16:05:25 -0700451 mutex_unlock(&cma_mutex);
452 if (ret == 0) {
453 page = pfn_to_page(pfn);
454 break;
Joonsoo Kima2541292014-08-06 16:05:25 -0700455 }
Joonsoo Kimb7155e72014-08-06 16:05:30 -0700456
Joonsoo Kima2541292014-08-06 16:05:25 -0700457 cma_clear_bitmap(cma, pfn, count);
Joonsoo Kimb7155e72014-08-06 16:05:30 -0700458 if (ret != -EBUSY)
459 break;
460
Joonsoo Kima2541292014-08-06 16:05:25 -0700461 pr_debug("%s(): memory range at %p is busy, retrying\n",
462 __func__, pfn_to_page(pfn));
463 /* try again with a bit different memory target */
464 start = bitmap_no + mask + 1;
465 }
466
Andrew Morton3acaea62015-11-05 18:50:08 -0800467 trace_cma_alloc(pfn, page, count, align);
Stefan Strogin99e8ea62015-04-15 16:14:50 -0700468
Boris Brezillonef465012017-10-13 15:58:01 -0700469 if (ret && !(gfp_mask & __GFP_NOWARN)) {
Pintu Agarwal5984af1082017-11-15 17:34:26 -0800470 pr_err("%s: alloc failed, req-size: %zu pages, ret: %d\n",
Jaewon Kimdbe43d42017-02-24 14:58:50 -0800471 __func__, count, ret);
472 cma_debug_show_areas(cma);
473 }
474
Joonsoo Kima2541292014-08-06 16:05:25 -0700475 pr_debug("%s(): returned %p\n", __func__, page);
476 return page;
477}
478
479/**
480 * cma_release() - release allocated pages
481 * @cma: Contiguous memory region for which the allocation is performed.
482 * @pages: Allocated pages.
483 * @count: Number of allocated pages.
484 *
485 * This function releases memory allocated by alloc_cma().
486 * It returns false when provided pages do not belong to contiguous area and
487 * true otherwise.
488 */
Sasha Levinac173822015-04-14 15:47:04 -0700489bool cma_release(struct cma *cma, const struct page *pages, unsigned int count)
Joonsoo Kima2541292014-08-06 16:05:25 -0700490{
491 unsigned long pfn;
492
493 if (!cma || !pages)
494 return false;
495
496 pr_debug("%s(page %p)\n", __func__, (void *)pages);
497
498 pfn = page_to_pfn(pages);
499
500 if (pfn < cma->base_pfn || pfn >= cma->base_pfn + cma->count)
501 return false;
502
503 VM_BUG_ON(pfn + count > cma->base_pfn + cma->count);
504
505 free_contig_range(pfn, count);
506 cma_clear_bitmap(cma, pfn, count);
Stefan Strogin99e8ea62015-04-15 16:14:50 -0700507 trace_cma_release(pfn, pages, count);
Joonsoo Kima2541292014-08-06 16:05:25 -0700508
509 return true;
510}
Laura Abbotte4231bc2017-04-18 11:27:04 -0700511
512int cma_for_each_area(int (*it)(struct cma *cma, void *data), void *data)
513{
514 int i;
515
516 for (i = 0; i < cma_area_count; i++) {
517 int ret = it(&cma_areas[i], data);
518
519 if (ret)
520 return ret;
521 }
522
523 return 0;
524}