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Commit | Line | Data |
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f2f45e5f JR |
1 | /* |
2 | * Copyright (C) 2008 Advanced Micro Devices, Inc. | |
3 | * | |
4 | * Author: Joerg Roedel <joerg.roedel@amd.com> | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or modify it | |
7 | * under the terms of the GNU General Public License version 2 as published | |
8 | * by the Free Software Foundation. | |
9 | * | |
10 | * This program is distributed in the hope that it will be useful, | |
11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
13 | * GNU General Public License for more details. | |
14 | * | |
15 | * You should have received a copy of the GNU General Public License | |
16 | * along with this program; if not, write to the Free Software | |
17 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
18 | */ | |
19 | ||
2d62ece1 | 20 | #include <linux/dma-mapping.h> |
f2f45e5f | 21 | #include <linux/dma-debug.h> |
30dfa90c | 22 | #include <linux/spinlock.h> |
788dcfa6 | 23 | #include <linux/debugfs.h> |
2d62ece1 | 24 | #include <linux/device.h> |
f2f45e5f | 25 | #include <linux/types.h> |
2d62ece1 | 26 | #include <linux/sched.h> |
f2f45e5f | 27 | #include <linux/list.h> |
6bf07871 | 28 | #include <linux/slab.h> |
f2f45e5f | 29 | |
30dfa90c JR |
30 | #define HASH_SIZE 1024ULL |
31 | #define HASH_FN_SHIFT 13 | |
32 | #define HASH_FN_MASK (HASH_SIZE - 1) | |
33 | ||
f2f45e5f JR |
34 | enum { |
35 | dma_debug_single, | |
36 | dma_debug_page, | |
37 | dma_debug_sg, | |
38 | dma_debug_coherent, | |
39 | }; | |
40 | ||
41 | struct dma_debug_entry { | |
42 | struct list_head list; | |
43 | struct device *dev; | |
44 | int type; | |
45 | phys_addr_t paddr; | |
46 | u64 dev_addr; | |
47 | u64 size; | |
48 | int direction; | |
49 | int sg_call_ents; | |
50 | int sg_mapped_ents; | |
51 | }; | |
52 | ||
30dfa90c JR |
53 | struct hash_bucket { |
54 | struct list_head list; | |
55 | spinlock_t lock; | |
2d62ece1 | 56 | } ____cacheline_aligned_in_smp; |
30dfa90c JR |
57 | |
58 | /* Hash list to save the allocated dma addresses */ | |
59 | static struct hash_bucket dma_entry_hash[HASH_SIZE]; | |
3b1e79ed JR |
60 | /* List of pre-allocated dma_debug_entry's */ |
61 | static LIST_HEAD(free_entries); | |
62 | /* Lock for the list above */ | |
63 | static DEFINE_SPINLOCK(free_entries_lock); | |
64 | ||
65 | /* Global disable flag - will be set in case of an error */ | |
66 | static bool global_disable __read_mostly; | |
67 | ||
788dcfa6 JR |
68 | /* Global error count */ |
69 | static u32 error_count; | |
70 | ||
71 | /* Global error show enable*/ | |
72 | static u32 show_all_errors __read_mostly; | |
73 | /* Number of errors to show */ | |
74 | static u32 show_num_errors = 1; | |
75 | ||
3b1e79ed JR |
76 | static u32 num_free_entries; |
77 | static u32 min_free_entries; | |
30dfa90c | 78 | |
59d3daaf JR |
79 | /* number of preallocated entries requested by kernel cmdline */ |
80 | static u32 req_entries; | |
81 | ||
788dcfa6 JR |
82 | /* debugfs dentry's for the stuff above */ |
83 | static struct dentry *dma_debug_dent __read_mostly; | |
84 | static struct dentry *global_disable_dent __read_mostly; | |
85 | static struct dentry *error_count_dent __read_mostly; | |
86 | static struct dentry *show_all_errors_dent __read_mostly; | |
87 | static struct dentry *show_num_errors_dent __read_mostly; | |
88 | static struct dentry *num_free_entries_dent __read_mostly; | |
89 | static struct dentry *min_free_entries_dent __read_mostly; | |
90 | ||
2d62ece1 JR |
91 | static const char *type2name[4] = { "single", "page", |
92 | "scather-gather", "coherent" }; | |
93 | ||
94 | static const char *dir2name[4] = { "DMA_BIDIRECTIONAL", "DMA_TO_DEVICE", | |
95 | "DMA_FROM_DEVICE", "DMA_NONE" }; | |
96 | ||
97 | /* | |
98 | * The access to some variables in this macro is racy. We can't use atomic_t | |
99 | * here because all these variables are exported to debugfs. Some of them even | |
100 | * writeable. This is also the reason why a lock won't help much. But anyway, | |
101 | * the races are no big deal. Here is why: | |
102 | * | |
103 | * error_count: the addition is racy, but the worst thing that can happen is | |
104 | * that we don't count some errors | |
105 | * show_num_errors: the subtraction is racy. Also no big deal because in | |
106 | * worst case this will result in one warning more in the | |
107 | * system log than the user configured. This variable is | |
108 | * writeable via debugfs. | |
109 | */ | |
110 | #define err_printk(dev, format, arg...) do { \ | |
111 | error_count += 1; \ | |
112 | if (show_all_errors || show_num_errors > 0) { \ | |
113 | WARN(1, "%s %s: " format, \ | |
114 | dev_driver_string(dev), \ | |
115 | dev_name(dev) , ## arg); \ | |
116 | } \ | |
117 | if (!show_all_errors && show_num_errors > 0) \ | |
118 | show_num_errors -= 1; \ | |
119 | } while (0); | |
120 | ||
30dfa90c JR |
121 | /* |
122 | * Hash related functions | |
123 | * | |
124 | * Every DMA-API request is saved into a struct dma_debug_entry. To | |
125 | * have quick access to these structs they are stored into a hash. | |
126 | */ | |
127 | static int hash_fn(struct dma_debug_entry *entry) | |
128 | { | |
129 | /* | |
130 | * Hash function is based on the dma address. | |
131 | * We use bits 20-27 here as the index into the hash | |
132 | */ | |
133 | return (entry->dev_addr >> HASH_FN_SHIFT) & HASH_FN_MASK; | |
134 | } | |
135 | ||
136 | /* | |
137 | * Request exclusive access to a hash bucket for a given dma_debug_entry. | |
138 | */ | |
139 | static struct hash_bucket *get_hash_bucket(struct dma_debug_entry *entry, | |
140 | unsigned long *flags) | |
141 | { | |
142 | int idx = hash_fn(entry); | |
143 | unsigned long __flags; | |
144 | ||
145 | spin_lock_irqsave(&dma_entry_hash[idx].lock, __flags); | |
146 | *flags = __flags; | |
147 | return &dma_entry_hash[idx]; | |
148 | } | |
149 | ||
150 | /* | |
151 | * Give up exclusive access to the hash bucket | |
152 | */ | |
153 | static void put_hash_bucket(struct hash_bucket *bucket, | |
154 | unsigned long *flags) | |
155 | { | |
156 | unsigned long __flags = *flags; | |
157 | ||
158 | spin_unlock_irqrestore(&bucket->lock, __flags); | |
159 | } | |
160 | ||
161 | /* | |
162 | * Search a given entry in the hash bucket list | |
163 | */ | |
164 | static struct dma_debug_entry *hash_bucket_find(struct hash_bucket *bucket, | |
165 | struct dma_debug_entry *ref) | |
166 | { | |
167 | struct dma_debug_entry *entry; | |
168 | ||
169 | list_for_each_entry(entry, &bucket->list, list) { | |
170 | if ((entry->dev_addr == ref->dev_addr) && | |
171 | (entry->dev == ref->dev)) | |
172 | return entry; | |
173 | } | |
174 | ||
175 | return NULL; | |
176 | } | |
177 | ||
178 | /* | |
179 | * Add an entry to a hash bucket | |
180 | */ | |
181 | static void hash_bucket_add(struct hash_bucket *bucket, | |
182 | struct dma_debug_entry *entry) | |
183 | { | |
184 | list_add_tail(&entry->list, &bucket->list); | |
185 | } | |
186 | ||
187 | /* | |
188 | * Remove entry from a hash bucket list | |
189 | */ | |
190 | static void hash_bucket_del(struct dma_debug_entry *entry) | |
191 | { | |
192 | list_del(&entry->list); | |
193 | } | |
194 | ||
195 | /* | |
196 | * Wrapper function for adding an entry to the hash. | |
197 | * This function takes care of locking itself. | |
198 | */ | |
199 | static void add_dma_entry(struct dma_debug_entry *entry) | |
200 | { | |
201 | struct hash_bucket *bucket; | |
202 | unsigned long flags; | |
203 | ||
204 | bucket = get_hash_bucket(entry, &flags); | |
205 | hash_bucket_add(bucket, entry); | |
206 | put_hash_bucket(bucket, &flags); | |
207 | } | |
208 | ||
3b1e79ed JR |
209 | /* struct dma_entry allocator |
210 | * | |
211 | * The next two functions implement the allocator for | |
212 | * struct dma_debug_entries. | |
213 | */ | |
214 | static struct dma_debug_entry *dma_entry_alloc(void) | |
215 | { | |
216 | struct dma_debug_entry *entry = NULL; | |
217 | unsigned long flags; | |
218 | ||
219 | spin_lock_irqsave(&free_entries_lock, flags); | |
220 | ||
221 | if (list_empty(&free_entries)) { | |
222 | printk(KERN_ERR "DMA-API: debugging out of memory " | |
223 | "- disabling\n"); | |
224 | global_disable = true; | |
225 | goto out; | |
226 | } | |
227 | ||
228 | entry = list_entry(free_entries.next, struct dma_debug_entry, list); | |
229 | list_del(&entry->list); | |
230 | memset(entry, 0, sizeof(*entry)); | |
231 | ||
232 | num_free_entries -= 1; | |
233 | if (num_free_entries < min_free_entries) | |
234 | min_free_entries = num_free_entries; | |
235 | ||
236 | out: | |
237 | spin_unlock_irqrestore(&free_entries_lock, flags); | |
238 | ||
239 | return entry; | |
240 | } | |
241 | ||
242 | static void dma_entry_free(struct dma_debug_entry *entry) | |
243 | { | |
244 | unsigned long flags; | |
245 | ||
246 | /* | |
247 | * add to beginning of the list - this way the entries are | |
248 | * more likely cache hot when they are reallocated. | |
249 | */ | |
250 | spin_lock_irqsave(&free_entries_lock, flags); | |
251 | list_add(&entry->list, &free_entries); | |
252 | num_free_entries += 1; | |
253 | spin_unlock_irqrestore(&free_entries_lock, flags); | |
254 | } | |
255 | ||
6bf07871 JR |
256 | /* |
257 | * DMA-API debugging init code | |
258 | * | |
259 | * The init code does two things: | |
260 | * 1. Initialize core data structures | |
261 | * 2. Preallocate a given number of dma_debug_entry structs | |
262 | */ | |
263 | ||
264 | static int prealloc_memory(u32 num_entries) | |
265 | { | |
266 | struct dma_debug_entry *entry, *next_entry; | |
267 | int i; | |
268 | ||
269 | for (i = 0; i < num_entries; ++i) { | |
270 | entry = kzalloc(sizeof(*entry), GFP_KERNEL); | |
271 | if (!entry) | |
272 | goto out_err; | |
273 | ||
274 | list_add_tail(&entry->list, &free_entries); | |
275 | } | |
276 | ||
277 | num_free_entries = num_entries; | |
278 | min_free_entries = num_entries; | |
279 | ||
280 | printk(KERN_INFO "DMA-API: preallocated %d debug entries\n", | |
281 | num_entries); | |
282 | ||
283 | return 0; | |
284 | ||
285 | out_err: | |
286 | ||
287 | list_for_each_entry_safe(entry, next_entry, &free_entries, list) { | |
288 | list_del(&entry->list); | |
289 | kfree(entry); | |
290 | } | |
291 | ||
292 | return -ENOMEM; | |
293 | } | |
294 | ||
788dcfa6 JR |
295 | static int dma_debug_fs_init(void) |
296 | { | |
297 | dma_debug_dent = debugfs_create_dir("dma-api", NULL); | |
298 | if (!dma_debug_dent) { | |
299 | printk(KERN_ERR "DMA-API: can not create debugfs directory\n"); | |
300 | return -ENOMEM; | |
301 | } | |
302 | ||
303 | global_disable_dent = debugfs_create_bool("disabled", 0444, | |
304 | dma_debug_dent, | |
305 | (u32 *)&global_disable); | |
306 | if (!global_disable_dent) | |
307 | goto out_err; | |
308 | ||
309 | error_count_dent = debugfs_create_u32("error_count", 0444, | |
310 | dma_debug_dent, &error_count); | |
311 | if (!error_count_dent) | |
312 | goto out_err; | |
313 | ||
314 | show_all_errors_dent = debugfs_create_u32("all_errors", 0644, | |
315 | dma_debug_dent, | |
316 | &show_all_errors); | |
317 | if (!show_all_errors_dent) | |
318 | goto out_err; | |
319 | ||
320 | show_num_errors_dent = debugfs_create_u32("num_errors", 0644, | |
321 | dma_debug_dent, | |
322 | &show_num_errors); | |
323 | if (!show_num_errors_dent) | |
324 | goto out_err; | |
325 | ||
326 | num_free_entries_dent = debugfs_create_u32("num_free_entries", 0444, | |
327 | dma_debug_dent, | |
328 | &num_free_entries); | |
329 | if (!num_free_entries_dent) | |
330 | goto out_err; | |
331 | ||
332 | min_free_entries_dent = debugfs_create_u32("min_free_entries", 0444, | |
333 | dma_debug_dent, | |
334 | &min_free_entries); | |
335 | if (!min_free_entries_dent) | |
336 | goto out_err; | |
337 | ||
338 | return 0; | |
339 | ||
340 | out_err: | |
341 | debugfs_remove_recursive(dma_debug_dent); | |
342 | ||
343 | return -ENOMEM; | |
344 | } | |
345 | ||
346 | ||
6bf07871 JR |
347 | /* |
348 | * Let the architectures decide how many entries should be preallocated. | |
349 | */ | |
350 | void dma_debug_init(u32 num_entries) | |
351 | { | |
352 | int i; | |
353 | ||
354 | if (global_disable) | |
355 | return; | |
356 | ||
357 | for (i = 0; i < HASH_SIZE; ++i) { | |
358 | INIT_LIST_HEAD(&dma_entry_hash[i].list); | |
359 | dma_entry_hash[i].lock = SPIN_LOCK_UNLOCKED; | |
360 | } | |
361 | ||
788dcfa6 JR |
362 | if (dma_debug_fs_init() != 0) { |
363 | printk(KERN_ERR "DMA-API: error creating debugfs entries " | |
364 | "- disabling\n"); | |
365 | global_disable = true; | |
366 | ||
367 | return; | |
368 | } | |
369 | ||
59d3daaf JR |
370 | if (req_entries) |
371 | num_entries = req_entries; | |
372 | ||
6bf07871 JR |
373 | if (prealloc_memory(num_entries) != 0) { |
374 | printk(KERN_ERR "DMA-API: debugging out of memory error " | |
375 | "- disabled\n"); | |
376 | global_disable = true; | |
377 | ||
378 | return; | |
379 | } | |
380 | ||
381 | printk(KERN_INFO "DMA-API: debugging enabled by kernel config\n"); | |
382 | } | |
383 | ||
59d3daaf JR |
384 | static __init int dma_debug_cmdline(char *str) |
385 | { | |
386 | if (!str) | |
387 | return -EINVAL; | |
388 | ||
389 | if (strncmp(str, "off", 3) == 0) { | |
390 | printk(KERN_INFO "DMA-API: debugging disabled on kernel " | |
391 | "command line\n"); | |
392 | global_disable = true; | |
393 | } | |
394 | ||
395 | return 0; | |
396 | } | |
397 | ||
398 | static __init int dma_debug_entries_cmdline(char *str) | |
399 | { | |
400 | int res; | |
401 | ||
402 | if (!str) | |
403 | return -EINVAL; | |
404 | ||
405 | res = get_option(&str, &req_entries); | |
406 | ||
407 | if (!res) | |
408 | req_entries = 0; | |
409 | ||
410 | return 0; | |
411 | } | |
412 | ||
413 | __setup("dma_debug=", dma_debug_cmdline); | |
414 | __setup("dma_debug_entries=", dma_debug_entries_cmdline); | |
415 | ||
2d62ece1 JR |
416 | static void check_unmap(struct dma_debug_entry *ref) |
417 | { | |
418 | struct dma_debug_entry *entry; | |
419 | struct hash_bucket *bucket; | |
420 | unsigned long flags; | |
421 | ||
422 | if (dma_mapping_error(ref->dev, ref->dev_addr)) | |
423 | return; | |
424 | ||
425 | bucket = get_hash_bucket(ref, &flags); | |
426 | entry = hash_bucket_find(bucket, ref); | |
427 | ||
428 | if (!entry) { | |
429 | err_printk(ref->dev, "DMA-API: device driver tries " | |
430 | "to free DMA memory it has not allocated " | |
431 | "[device address=0x%016llx] [size=%llu bytes]\n", | |
432 | ref->dev_addr, ref->size); | |
433 | goto out; | |
434 | } | |
435 | ||
436 | if (ref->size != entry->size) { | |
437 | err_printk(ref->dev, "DMA-API: device driver frees " | |
438 | "DMA memory with different size " | |
439 | "[device address=0x%016llx] [map size=%llu bytes] " | |
440 | "[unmap size=%llu bytes]\n", | |
441 | ref->dev_addr, entry->size, ref->size); | |
442 | } | |
443 | ||
444 | if (ref->type != entry->type) { | |
445 | err_printk(ref->dev, "DMA-API: device driver frees " | |
446 | "DMA memory with wrong function " | |
447 | "[device address=0x%016llx] [size=%llu bytes] " | |
448 | "[mapped as %s] [unmapped as %s]\n", | |
449 | ref->dev_addr, ref->size, | |
450 | type2name[entry->type], type2name[ref->type]); | |
451 | } else if ((entry->type == dma_debug_coherent) && | |
452 | (ref->paddr != entry->paddr)) { | |
453 | err_printk(ref->dev, "DMA-API: device driver frees " | |
454 | "DMA memory with different CPU address " | |
455 | "[device address=0x%016llx] [size=%llu bytes] " | |
456 | "[cpu alloc address=%p] [cpu free address=%p]", | |
457 | ref->dev_addr, ref->size, | |
458 | (void *)entry->paddr, (void *)ref->paddr); | |
459 | } | |
460 | ||
461 | if (ref->sg_call_ents && ref->type == dma_debug_sg && | |
462 | ref->sg_call_ents != entry->sg_call_ents) { | |
463 | err_printk(ref->dev, "DMA-API: device driver frees " | |
464 | "DMA sg list with different entry count " | |
465 | "[map count=%d] [unmap count=%d]\n", | |
466 | entry->sg_call_ents, ref->sg_call_ents); | |
467 | } | |
468 | ||
469 | /* | |
470 | * This may be no bug in reality - but most implementations of the | |
471 | * DMA API don't handle this properly, so check for it here | |
472 | */ | |
473 | if (ref->direction != entry->direction) { | |
474 | err_printk(ref->dev, "DMA-API: device driver frees " | |
475 | "DMA memory with different direction " | |
476 | "[device address=0x%016llx] [size=%llu bytes] " | |
477 | "[mapped with %s] [unmapped with %s]\n", | |
478 | ref->dev_addr, ref->size, | |
479 | dir2name[entry->direction], | |
480 | dir2name[ref->direction]); | |
481 | } | |
482 | ||
483 | hash_bucket_del(entry); | |
484 | dma_entry_free(entry); | |
485 | ||
486 | out: | |
487 | put_hash_bucket(bucket, &flags); | |
488 | } | |
489 | ||
490 | static void check_for_stack(struct device *dev, void *addr) | |
491 | { | |
492 | if (object_is_on_stack(addr)) | |
493 | err_printk(dev, "DMA-API: device driver maps memory from stack" | |
494 | " [addr=%p]\n", addr); | |
495 | } | |
496 | ||
497 | static void check_sync(struct device *dev, dma_addr_t addr, | |
498 | u64 size, u64 offset, int direction, bool to_cpu) | |
499 | { | |
500 | struct dma_debug_entry ref = { | |
501 | .dev = dev, | |
502 | .dev_addr = addr, | |
503 | .size = size, | |
504 | .direction = direction, | |
505 | }; | |
506 | struct dma_debug_entry *entry; | |
507 | struct hash_bucket *bucket; | |
508 | unsigned long flags; | |
509 | ||
510 | bucket = get_hash_bucket(&ref, &flags); | |
511 | ||
512 | entry = hash_bucket_find(bucket, &ref); | |
513 | ||
514 | if (!entry) { | |
515 | err_printk(dev, "DMA-API: device driver tries " | |
516 | "to sync DMA memory it has not allocated " | |
517 | "[device address=0x%016llx] [size=%llu bytes]\n", | |
518 | addr, size); | |
519 | goto out; | |
520 | } | |
521 | ||
522 | if ((offset + size) > entry->size) { | |
523 | err_printk(dev, "DMA-API: device driver syncs" | |
524 | " DMA memory outside allocated range " | |
525 | "[device address=0x%016llx] " | |
526 | "[allocation size=%llu bytes] [sync offset=%llu] " | |
527 | "[sync size=%llu]\n", entry->dev_addr, entry->size, | |
528 | offset, size); | |
529 | } | |
530 | ||
531 | if (direction != entry->direction) { | |
532 | err_printk(dev, "DMA-API: device driver syncs " | |
533 | "DMA memory with different direction " | |
534 | "[device address=0x%016llx] [size=%llu bytes] " | |
535 | "[mapped with %s] [synced with %s]\n", | |
536 | addr, entry->size, | |
537 | dir2name[entry->direction], | |
538 | dir2name[direction]); | |
539 | } | |
540 | ||
541 | if (entry->direction == DMA_BIDIRECTIONAL) | |
542 | goto out; | |
543 | ||
544 | if (to_cpu && !(entry->direction == DMA_FROM_DEVICE) && | |
545 | !(direction == DMA_TO_DEVICE)) | |
546 | err_printk(dev, "DMA-API: device driver syncs " | |
547 | "device read-only DMA memory for cpu " | |
548 | "[device address=0x%016llx] [size=%llu bytes] " | |
549 | "[mapped with %s] [synced with %s]\n", | |
550 | addr, entry->size, | |
551 | dir2name[entry->direction], | |
552 | dir2name[direction]); | |
553 | ||
554 | if (!to_cpu && !(entry->direction == DMA_TO_DEVICE) && | |
555 | !(direction == DMA_FROM_DEVICE)) | |
556 | err_printk(dev, "DMA-API: device driver syncs " | |
557 | "device write-only DMA memory to device " | |
558 | "[device address=0x%016llx] [size=%llu bytes] " | |
559 | "[mapped with %s] [synced with %s]\n", | |
560 | addr, entry->size, | |
561 | dir2name[entry->direction], | |
562 | dir2name[direction]); | |
563 | ||
564 | out: | |
565 | put_hash_bucket(bucket, &flags); | |
566 | ||
567 | } | |
568 | ||
f62bc980 JR |
569 | void debug_dma_map_page(struct device *dev, struct page *page, size_t offset, |
570 | size_t size, int direction, dma_addr_t dma_addr, | |
571 | bool map_single) | |
572 | { | |
573 | struct dma_debug_entry *entry; | |
574 | ||
575 | if (unlikely(global_disable)) | |
576 | return; | |
577 | ||
578 | if (unlikely(dma_mapping_error(dev, dma_addr))) | |
579 | return; | |
580 | ||
581 | entry = dma_entry_alloc(); | |
582 | if (!entry) | |
583 | return; | |
584 | ||
585 | entry->dev = dev; | |
586 | entry->type = dma_debug_page; | |
587 | entry->paddr = page_to_phys(page) + offset; | |
588 | entry->dev_addr = dma_addr; | |
589 | entry->size = size; | |
590 | entry->direction = direction; | |
591 | ||
592 | if (map_single) { | |
593 | entry->type = dma_debug_single; | |
594 | check_for_stack(dev, page_address(page) + offset); | |
595 | } | |
596 | ||
597 | add_dma_entry(entry); | |
598 | } | |
599 | EXPORT_SYMBOL(debug_dma_map_page); | |
600 | ||
601 | void debug_dma_unmap_page(struct device *dev, dma_addr_t addr, | |
602 | size_t size, int direction, bool map_single) | |
603 | { | |
604 | struct dma_debug_entry ref = { | |
605 | .type = dma_debug_page, | |
606 | .dev = dev, | |
607 | .dev_addr = addr, | |
608 | .size = size, | |
609 | .direction = direction, | |
610 | }; | |
611 | ||
612 | if (unlikely(global_disable)) | |
613 | return; | |
614 | ||
615 | if (map_single) | |
616 | ref.type = dma_debug_single; | |
617 | ||
618 | check_unmap(&ref); | |
619 | } | |
620 | EXPORT_SYMBOL(debug_dma_unmap_page); | |
621 |