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drm/i915: acpi/video.c fix section mismatch warning
[linux-2.6/linux-acpi-2.6.git] / lib / dma-debug.c
blob69da09a085a1943ea6a70f4871fd2df1683110fb
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
20 #include <linux/scatterlist.h>
21 #include <linux/dma-mapping.h>
22 #include <linux/stacktrace.h>
23 #include <linux/dma-debug.h>
24 #include <linux/spinlock.h>
25 #include <linux/debugfs.h>
26 #include <linux/device.h>
27 #include <linux/types.h>
28 #include <linux/sched.h>
29 #include <linux/list.h>
30 #include <linux/slab.h>
31
32 #include <asm/sections.h>
33
34 #define HASH_SIZE 1024ULL
35 #define HASH_FN_SHIFT 13
36 #define HASH_FN_MASK (HASH_SIZE - 1)
37
38 enum {
39 dma_debug_single,
40 dma_debug_page,
41 dma_debug_sg,
42 dma_debug_coherent,
43 };
44
45 #define DMA_DEBUG_STACKTRACE_ENTRIES 5
46
47 struct dma_debug_entry {
48 struct list_head list;
49 struct device *dev;
50 int type;
51 phys_addr_t paddr;
52 u64 dev_addr;
53 u64 size;
54 int direction;
55 int sg_call_ents;
56 int sg_mapped_ents;
57 #ifdef CONFIG_STACKTRACE
58 struct stack_trace stacktrace;
59 unsigned long st_entries[DMA_DEBUG_STACKTRACE_ENTRIES];
60 #endif
61 };
62
63 struct hash_bucket {
64 struct list_head list;
65 spinlock_t lock;
66 } ____cacheline_aligned_in_smp;
67
68 /* Hash list to save the allocated dma addresses */
69 static struct hash_bucket dma_entry_hash[HASH_SIZE];
70 /* List of pre-allocated dma_debug_entry's */
71 static LIST_HEAD(free_entries);
72 /* Lock for the list above */
73 static DEFINE_SPINLOCK(free_entries_lock);
74
75 /* Global disable flag - will be set in case of an error */
76 static bool global_disable __read_mostly;
77
78 /* Global error count */
79 static u32 error_count;
80
81 /* Global error show enable*/
82 static u32 show_all_errors __read_mostly;
83 /* Number of errors to show */
84 static u32 show_num_errors = 1;
85
86 static u32 num_free_entries;
87 static u32 min_free_entries;
88
89 /* number of preallocated entries requested by kernel cmdline */
90 static u32 req_entries;
91
92 /* debugfs dentry's for the stuff above */
93 static struct dentry *dma_debug_dent __read_mostly;
94 static struct dentry *global_disable_dent __read_mostly;
95 static struct dentry *error_count_dent __read_mostly;
96 static struct dentry *show_all_errors_dent __read_mostly;
97 static struct dentry *show_num_errors_dent __read_mostly;
98 static struct dentry *num_free_entries_dent __read_mostly;
99 static struct dentry *min_free_entries_dent __read_mostly;
100
101 static const char *type2name[4] = { "single", "page",
102 "scather-gather", "coherent" };
103
104 static const char *dir2name[4] = { "DMA_BIDIRECTIONAL", "DMA_TO_DEVICE",
105 "DMA_FROM_DEVICE", "DMA_NONE" };
106
107 /*
108 * The access to some variables in this macro is racy. We can't use atomic_t
109 * here because all these variables are exported to debugfs. Some of them even
110 * writeable. This is also the reason why a lock won't help much. But anyway,
111 * the races are no big deal. Here is why:
112 *
113 * error_count: the addition is racy, but the worst thing that can happen is
114 * that we don't count some errors
115 * show_num_errors: the subtraction is racy. Also no big deal because in
116 * worst case this will result in one warning more in the
117 * system log than the user configured. This variable is
118 * writeable via debugfs.
119 */
120 static inline void dump_entry_trace(struct dma_debug_entry *entry)
121 {
122 #ifdef CONFIG_STACKTRACE
123 if (entry) {
124 printk(KERN_WARNING "Mapped at:\n");
125 print_stack_trace(&entry->stacktrace, 0);
126 }
127 #endif
128 }
129
130 #define err_printk(dev, entry, format, arg...) do { \
131 error_count += 1; \
132 if (show_all_errors || show_num_errors > 0) { \
133 WARN(1, "%s %s: " format, \
134 dev_driver_string(dev), \
135 dev_name(dev) , ## arg); \
136 dump_entry_trace(entry); \
137 } \
138 if (!show_all_errors && show_num_errors > 0) \
139 show_num_errors -= 1; \
140 } while (0);
141
142 /*
143 * Hash related functions
144 *
145 * Every DMA-API request is saved into a struct dma_debug_entry. To
146 * have quick access to these structs they are stored into a hash.
147 */
148 static int hash_fn(struct dma_debug_entry *entry)
149 {
150 /*
151 * Hash function is based on the dma address.
152 * We use bits 20-27 here as the index into the hash
153 */
154 return (entry->dev_addr >> HASH_FN_SHIFT) & HASH_FN_MASK;
155 }
156
157 /*
158 * Request exclusive access to a hash bucket for a given dma_debug_entry.
159 */
160 static struct hash_bucket *get_hash_bucket(struct dma_debug_entry *entry,
161 unsigned long *flags)
162 {
163 int idx = hash_fn(entry);
164 unsigned long __flags;
165
166 spin_lock_irqsave(&dma_entry_hash[idx].lock, __flags);
167 *flags = __flags;
168 return &dma_entry_hash[idx];
169 }
170
171 /*
172 * Give up exclusive access to the hash bucket
173 */
174 static void put_hash_bucket(struct hash_bucket *bucket,
175 unsigned long *flags)
176 {
177 unsigned long __flags = *flags;
178
179 spin_unlock_irqrestore(&bucket->lock, __flags);
180 }
181
182 /*
183 * Search a given entry in the hash bucket list
184 */
185 static struct dma_debug_entry *hash_bucket_find(struct hash_bucket *bucket,
186 struct dma_debug_entry *ref)
187 {
188 struct dma_debug_entry *entry;
189
190 list_for_each_entry(entry, &bucket->list, list) {
191 if ((entry->dev_addr == ref->dev_addr) &&
192 (entry->dev == ref->dev))
193 return entry;
194 }
195
196 return NULL;
197 }
198
199 /*
200 * Add an entry to a hash bucket
201 */
202 static void hash_bucket_add(struct hash_bucket *bucket,
203 struct dma_debug_entry *entry)
204 {
205 list_add_tail(&entry->list, &bucket->list);
206 }
207
208 /*
209 * Remove entry from a hash bucket list
210 */
211 static void hash_bucket_del(struct dma_debug_entry *entry)
212 {
213 list_del(&entry->list);
214 }
215
216 /*
217 * Dump mapping entries for debugging purposes
218 */
219 void debug_dma_dump_mappings(struct device *dev)
220 {
221 int idx;
222
223 for (idx = 0; idx < HASH_SIZE; idx++) {
224 struct hash_bucket *bucket = &dma_entry_hash[idx];
225 struct dma_debug_entry *entry;
226 unsigned long flags;
227
228 spin_lock_irqsave(&bucket->lock, flags);
229
230 list_for_each_entry(entry, &bucket->list, list) {
231 if (!dev || dev == entry->dev) {
232 dev_info(entry->dev,
233 "%s idx %d P=%Lx D=%Lx L=%Lx %s\n",
234 type2name[entry->type], idx,
235 (unsigned long long)entry->paddr,
236 entry->dev_addr, entry->size,
237 dir2name[entry->direction]);
238 }
239 }
240
241 spin_unlock_irqrestore(&bucket->lock, flags);
242 }
243 }
244 EXPORT_SYMBOL(debug_dma_dump_mappings);
245
246 /*
247 * Wrapper function for adding an entry to the hash.
248 * This function takes care of locking itself.
249 */
250 static void add_dma_entry(struct dma_debug_entry *entry)
251 {
252 struct hash_bucket *bucket;
253 unsigned long flags;
254
255 bucket = get_hash_bucket(entry, &flags);
256 hash_bucket_add(bucket, entry);
257 put_hash_bucket(bucket, &flags);
258 }
259
260 /* struct dma_entry allocator
261 *
262 * The next two functions implement the allocator for
263 * struct dma_debug_entries.
264 */
265 static struct dma_debug_entry *dma_entry_alloc(void)
266 {
267 struct dma_debug_entry *entry = NULL;
268 unsigned long flags;
269
270 spin_lock_irqsave(&free_entries_lock, flags);
271
272 if (list_empty(&free_entries)) {
273 printk(KERN_ERR "DMA-API: debugging out of memory "
274 "- disabling\n");
275 global_disable = true;
276 goto out;
277 }
278
279 entry = list_entry(free_entries.next, struct dma_debug_entry, list);
280 list_del(&entry->list);
281 memset(entry, 0, sizeof(*entry));
282
283 #ifdef CONFIG_STACKTRACE
284 entry->stacktrace.max_entries = DMA_DEBUG_STACKTRACE_ENTRIES;
285 entry->stacktrace.entries = entry->st_entries;
286 entry->stacktrace.skip = 2;
287 save_stack_trace(&entry->stacktrace);
288 #endif
289 num_free_entries -= 1;
290 if (num_free_entries < min_free_entries)
291 min_free_entries = num_free_entries;
292
293 out:
294 spin_unlock_irqrestore(&free_entries_lock, flags);
295
296 return entry;
297 }
298
299 static void dma_entry_free(struct dma_debug_entry *entry)
300 {
301 unsigned long flags;
302
303 /*
304 * add to beginning of the list - this way the entries are
305 * more likely cache hot when they are reallocated.
306 */
307 spin_lock_irqsave(&free_entries_lock, flags);
308 list_add(&entry->list, &free_entries);
309 num_free_entries += 1;
310 spin_unlock_irqrestore(&free_entries_lock, flags);
311 }
312
313 /*
314 * DMA-API debugging init code
315 *
316 * The init code does two things:
317 * 1. Initialize core data structures
318 * 2. Preallocate a given number of dma_debug_entry structs
319 */
320
321 static int prealloc_memory(u32 num_entries)
322 {
323 struct dma_debug_entry *entry, *next_entry;
324 int i;
325
326 for (i = 0; i < num_entries; ++i) {
327 entry = kzalloc(sizeof(*entry), GFP_KERNEL);
328 if (!entry)
329 goto out_err;
330
331 list_add_tail(&entry->list, &free_entries);
332 }
333
334 num_free_entries = num_entries;
335 min_free_entries = num_entries;
336
337 printk(KERN_INFO "DMA-API: preallocated %d debug entries\n",
338 num_entries);
339
340 return 0;
341
342 out_err:
343
344 list_for_each_entry_safe(entry, next_entry, &free_entries, list) {
345 list_del(&entry->list);
346 kfree(entry);
347 }
348
349 return -ENOMEM;
350 }
351
352 static int dma_debug_fs_init(void)
353 {
354 dma_debug_dent = debugfs_create_dir("dma-api", NULL);
355 if (!dma_debug_dent) {
356 printk(KERN_ERR "DMA-API: can not create debugfs directory\n");
357 return -ENOMEM;
358 }
359
360 global_disable_dent = debugfs_create_bool("disabled", 0444,
361 dma_debug_dent,
362 (u32 *)&global_disable);
363 if (!global_disable_dent)
364 goto out_err;
365
366 error_count_dent = debugfs_create_u32("error_count", 0444,
367 dma_debug_dent, &error_count);
368 if (!error_count_dent)
369 goto out_err;
370
371 show_all_errors_dent = debugfs_create_u32("all_errors", 0644,
372 dma_debug_dent,
373 &show_all_errors);
374 if (!show_all_errors_dent)
375 goto out_err;
376
377 show_num_errors_dent = debugfs_create_u32("num_errors", 0644,
378 dma_debug_dent,
379 &show_num_errors);
380 if (!show_num_errors_dent)
381 goto out_err;
382
383 num_free_entries_dent = debugfs_create_u32("num_free_entries", 0444,
384 dma_debug_dent,
385 &num_free_entries);
386 if (!num_free_entries_dent)
387 goto out_err;
388
389 min_free_entries_dent = debugfs_create_u32("min_free_entries", 0444,
390 dma_debug_dent,
391 &min_free_entries);
392 if (!min_free_entries_dent)
393 goto out_err;
394
395 return 0;
396
397 out_err:
398 debugfs_remove_recursive(dma_debug_dent);
399
400 return -ENOMEM;
401 }
402
403 void dma_debug_add_bus(struct bus_type *bus)
404 {
405 /* FIXME: register notifier */
406 }
407
408 /*
409 * Let the architectures decide how many entries should be preallocated.
410 */
411 void dma_debug_init(u32 num_entries)
412 {
413 int i;
414
415 if (global_disable)
416 return;
417
418 for (i = 0; i < HASH_SIZE; ++i) {
419 INIT_LIST_HEAD(&dma_entry_hash[i].list);
420 dma_entry_hash[i].lock = SPIN_LOCK_UNLOCKED;
421 }
422
423 if (dma_debug_fs_init() != 0) {
424 printk(KERN_ERR "DMA-API: error creating debugfs entries "
425 "- disabling\n");
426 global_disable = true;
427
428 return;
429 }
430
431 if (req_entries)
432 num_entries = req_entries;
433
434 if (prealloc_memory(num_entries) != 0) {
435 printk(KERN_ERR "DMA-API: debugging out of memory error "
436 "- disabled\n");
437 global_disable = true;
438
439 return;
440 }
441
442 printk(KERN_INFO "DMA-API: debugging enabled by kernel config\n");
443 }
444
445 static __init int dma_debug_cmdline(char *str)
446 {
447 if (!str)
448 return -EINVAL;
449
450 if (strncmp(str, "off", 3) == 0) {
451 printk(KERN_INFO "DMA-API: debugging disabled on kernel "
452 "command line\n");
453 global_disable = true;
454 }
455
456 return 0;
457 }
458
459 static __init int dma_debug_entries_cmdline(char *str)
460 {
461 int res;
462
463 if (!str)
464 return -EINVAL;
465
466 res = get_option(&str, &req_entries);
467
468 if (!res)
469 req_entries = 0;
470
471 return 0;
472 }
473
474 __setup("dma_debug=", dma_debug_cmdline);
475 __setup("dma_debug_entries=", dma_debug_entries_cmdline);
476
477 static void check_unmap(struct dma_debug_entry *ref)
478 {
479 struct dma_debug_entry *entry;
480 struct hash_bucket *bucket;
481 unsigned long flags;
482
483 if (dma_mapping_error(ref->dev, ref->dev_addr)) {
484 err_printk(ref->dev, NULL, "DMA-API: device driver tries "
485 "to free an invalid DMA memory address\n");
486 return;
487 }
488
489 bucket = get_hash_bucket(ref, &flags);
490 entry = hash_bucket_find(bucket, ref);
491
492 if (!entry) {
493 err_printk(ref->dev, NULL, "DMA-API: device driver tries "
494 "to free DMA memory it has not allocated "
495 "[device address=0x%016llx] [size=%llu bytes]\n",
496 ref->dev_addr, ref->size);
497 goto out;
498 }
499
500 if (ref->size != entry->size) {
501 err_printk(ref->dev, entry, "DMA-API: device driver frees "
502 "DMA memory with different size "
503 "[device address=0x%016llx] [map size=%llu bytes] "
504 "[unmap size=%llu bytes]\n",
505 ref->dev_addr, entry->size, ref->size);
506 }
507
508 if (ref->type != entry->type) {
509 err_printk(ref->dev, entry, "DMA-API: device driver frees "
510 "DMA memory with wrong function "
511 "[device address=0x%016llx] [size=%llu bytes] "
512 "[mapped as %s] [unmapped as %s]\n",
513 ref->dev_addr, ref->size,
514 type2name[entry->type], type2name[ref->type]);
515 } else if ((entry->type == dma_debug_coherent) &&
516 (ref->paddr != entry->paddr)) {
517 err_printk(ref->dev, entry, "DMA-API: device driver frees "
518 "DMA memory with different CPU address "
519 "[device address=0x%016llx] [size=%llu bytes] "
520 "[cpu alloc address=%p] [cpu free address=%p]",
521 ref->dev_addr, ref->size,
522 (void *)entry->paddr, (void *)ref->paddr);
523 }
524
525 if (ref->sg_call_ents && ref->type == dma_debug_sg &&
526 ref->sg_call_ents != entry->sg_call_ents) {
527 err_printk(ref->dev, entry, "DMA-API: device driver frees "
528 "DMA sg list with different entry count "
529 "[map count=%d] [unmap count=%d]\n",
530 entry->sg_call_ents, ref->sg_call_ents);
531 }
532
533 /*
534 * This may be no bug in reality - but most implementations of the
535 * DMA API don't handle this properly, so check for it here
536 */
537 if (ref->direction != entry->direction) {
538 err_printk(ref->dev, entry, "DMA-API: device driver frees "
539 "DMA memory with different direction "
540 "[device address=0x%016llx] [size=%llu bytes] "
541 "[mapped with %s] [unmapped with %s]\n",
542 ref->dev_addr, ref->size,
543 dir2name[entry->direction],
544 dir2name[ref->direction]);
545 }
546
547 hash_bucket_del(entry);
548 dma_entry_free(entry);
549
550 out:
551 put_hash_bucket(bucket, &flags);
552 }
553
554 static void check_for_stack(struct device *dev, void *addr)
555 {
556 if (object_is_on_stack(addr))
557 err_printk(dev, NULL, "DMA-API: device driver maps memory from"
558 "stack [addr=%p]\n", addr);
559 }
560
561 static inline bool overlap(void *addr, u64 size, void *start, void *end)
562 {
563 void *addr2 = (char *)addr + size;
564
565 return ((addr >= start && addr < end) ||
566 (addr2 >= start && addr2 < end) ||
567 ((addr < start) && (addr2 >= end)));
568 }
569
570 static void check_for_illegal_area(struct device *dev, void *addr, u64 size)
571 {
572 if (overlap(addr, size, _text, _etext) ||
573 overlap(addr, size, __start_rodata, __end_rodata))
574 err_printk(dev, NULL, "DMA-API: device driver maps "
575 "memory from kernel text or rodata "
576 "[addr=%p] [size=%llu]\n", addr, size);
577 }
578
579 static void check_sync(struct device *dev, dma_addr_t addr,
580 u64 size, u64 offset, int direction, bool to_cpu)
581 {
582 struct dma_debug_entry ref = {
583 .dev = dev,
584 .dev_addr = addr,
585 .size = size,
586 .direction = direction,
587 };
588 struct dma_debug_entry *entry;
589 struct hash_bucket *bucket;
590 unsigned long flags;
591
592 bucket = get_hash_bucket(&ref, &flags);
593
594 entry = hash_bucket_find(bucket, &ref);
595
596 if (!entry) {
597 err_printk(dev, NULL, "DMA-API: device driver tries "
598 "to sync DMA memory it has not allocated "
599 "[device address=0x%016llx] [size=%llu bytes]\n",
600 (unsigned long long)addr, size);
601 goto out;
602 }
603
604 if ((offset + size) > entry->size) {
605 err_printk(dev, entry, "DMA-API: device driver syncs"
606 " DMA memory outside allocated range "
607 "[device address=0x%016llx] "
608 "[allocation size=%llu bytes] [sync offset=%llu] "
609 "[sync size=%llu]\n", entry->dev_addr, entry->size,
610 offset, size);
611 }
612
613 if (direction != entry->direction) {
614 err_printk(dev, entry, "DMA-API: device driver syncs "
615 "DMA memory with different direction "
616 "[device address=0x%016llx] [size=%llu bytes] "
617 "[mapped with %s] [synced with %s]\n",
618 (unsigned long long)addr, entry->size,
619 dir2name[entry->direction],
620 dir2name[direction]);
621 }
622
623 if (entry->direction == DMA_BIDIRECTIONAL)
624 goto out;
625
626 if (to_cpu && !(entry->direction == DMA_FROM_DEVICE) &&
627 !(direction == DMA_TO_DEVICE))
628 err_printk(dev, entry, "DMA-API: device driver syncs "
629 "device read-only DMA memory for cpu "
630 "[device address=0x%016llx] [size=%llu bytes] "
631 "[mapped with %s] [synced with %s]\n",
632 (unsigned long long)addr, entry->size,
633 dir2name[entry->direction],
634 dir2name[direction]);
635
636 if (!to_cpu && !(entry->direction == DMA_TO_DEVICE) &&
637 !(direction == DMA_FROM_DEVICE))
638 err_printk(dev, entry, "DMA-API: device driver syncs "
639 "device write-only DMA memory to device "
640 "[device address=0x%016llx] [size=%llu bytes] "
641 "[mapped with %s] [synced with %s]\n",
642 (unsigned long long)addr, entry->size,
643 dir2name[entry->direction],
644 dir2name[direction]);
645
646 out:
647 put_hash_bucket(bucket, &flags);
648
649 }
650
651 void debug_dma_map_page(struct device *dev, struct page *page, size_t offset,
652 size_t size, int direction, dma_addr_t dma_addr,
653 bool map_single)
654 {
655 struct dma_debug_entry *entry;
656
657 if (unlikely(global_disable))
658 return;
659
660 if (unlikely(dma_mapping_error(dev, dma_addr)))
661 return;
662
663 entry = dma_entry_alloc();
664 if (!entry)
665 return;
666
667 entry->dev = dev;
668 entry->type = dma_debug_page;
669 entry->paddr = page_to_phys(page) + offset;
670 entry->dev_addr = dma_addr;
671 entry->size = size;
672 entry->direction = direction;
673
674 if (map_single)
675 entry->type = dma_debug_single;
676
677 if (!PageHighMem(page)) {
678 void *addr = ((char *)page_address(page)) + offset;
679 check_for_stack(dev, addr);
680 check_for_illegal_area(dev, addr, size);
681 }
682
683 add_dma_entry(entry);
684 }
685 EXPORT_SYMBOL(debug_dma_map_page);
686
687 void debug_dma_unmap_page(struct device *dev, dma_addr_t addr,
688 size_t size, int direction, bool map_single)
689 {
690 struct dma_debug_entry ref = {
691 .type = dma_debug_page,
692 .dev = dev,
693 .dev_addr = addr,
694 .size = size,
695 .direction = direction,
696 };
697
698 if (unlikely(global_disable))
699 return;
700
701 if (map_single)
702 ref.type = dma_debug_single;
703
704 check_unmap(&ref);
705 }
706 EXPORT_SYMBOL(debug_dma_unmap_page);
707
708 void debug_dma_map_sg(struct device *dev, struct scatterlist *sg,
709 int nents, int mapped_ents, int direction)
710 {
711 struct dma_debug_entry *entry;
712 struct scatterlist *s;
713 int i;
714
715 if (unlikely(global_disable))
716 return;
717
718 for_each_sg(sg, s, mapped_ents, i) {
719 entry = dma_entry_alloc();
720 if (!entry)
721 return;
722
723 entry->type = dma_debug_sg;
724 entry->dev = dev;
725 entry->paddr = sg_phys(s);
726 entry->size = s->length;
727 entry->dev_addr = s->dma_address;
728 entry->direction = direction;
729 entry->sg_call_ents = nents;
730 entry->sg_mapped_ents = mapped_ents;
731
732 if (!PageHighMem(sg_page(s))) {
733 check_for_stack(dev, sg_virt(s));
734 check_for_illegal_area(dev, sg_virt(s), s->length);
735 }
736
737 add_dma_entry(entry);
738 }
739 }
740 EXPORT_SYMBOL(debug_dma_map_sg);
741
742 void debug_dma_unmap_sg(struct device *dev, struct scatterlist *sglist,
743 int nelems, int dir)
744 {
745 struct dma_debug_entry *entry;
746 struct scatterlist *s;
747 int mapped_ents = 0, i;
748 unsigned long flags;
749
750 if (unlikely(global_disable))
751 return;
752
753 for_each_sg(sglist, s, nelems, i) {
754
755 struct dma_debug_entry ref = {
756 .type = dma_debug_sg,
757 .dev = dev,
758 .paddr = sg_phys(s),
759 .dev_addr = s->dma_address,
760 .size = s->length,
761 .direction = dir,
762 .sg_call_ents = 0,
763 };
764
765 if (mapped_ents && i >= mapped_ents)
766 break;
767
768 if (mapped_ents == 0) {
769 struct hash_bucket *bucket;
770 ref.sg_call_ents = nelems;
771 bucket = get_hash_bucket(&ref, &flags);
772 entry = hash_bucket_find(bucket, &ref);
773 if (entry)
774 mapped_ents = entry->sg_mapped_ents;
775 put_hash_bucket(bucket, &flags);
776 }
777
778 check_unmap(&ref);
779 }
780 }
781 EXPORT_SYMBOL(debug_dma_unmap_sg);
782
783 void debug_dma_alloc_coherent(struct device *dev, size_t size,
784 dma_addr_t dma_addr, void *virt)
785 {
786 struct dma_debug_entry *entry;
787
788 if (unlikely(global_disable))
789 return;
790
791 if (unlikely(virt == NULL))
792 return;
793
794 entry = dma_entry_alloc();
795 if (!entry)
796 return;
797
798 entry->type = dma_debug_coherent;
799 entry->dev = dev;
800 entry->paddr = virt_to_phys(virt);
801 entry->size = size;
802 entry->dev_addr = dma_addr;
803 entry->direction = DMA_BIDIRECTIONAL;
804
805 add_dma_entry(entry);
806 }
807 EXPORT_SYMBOL(debug_dma_alloc_coherent);
808
809 void debug_dma_free_coherent(struct device *dev, size_t size,
810 void *virt, dma_addr_t addr)
811 {
812 struct dma_debug_entry ref = {
813 .type = dma_debug_coherent,
814 .dev = dev,
815 .paddr = virt_to_phys(virt),
816 .dev_addr = addr,
817 .size = size,
818 .direction = DMA_BIDIRECTIONAL,
819 };
820
821 if (unlikely(global_disable))
822 return;
823
824 check_unmap(&ref);
825 }
826 EXPORT_SYMBOL(debug_dma_free_coherent);
827
828 void debug_dma_sync_single_for_cpu(struct device *dev, dma_addr_t dma_handle,
829 size_t size, int direction)
830 {
831 if (unlikely(global_disable))
832 return;
833
834 check_sync(dev, dma_handle, size, 0, direction, true);
835 }
836 EXPORT_SYMBOL(debug_dma_sync_single_for_cpu);
837
838 void debug_dma_sync_single_for_device(struct device *dev,
839 dma_addr_t dma_handle, size_t size,
840 int direction)
841 {
842 if (unlikely(global_disable))
843 return;
844
845 check_sync(dev, dma_handle, size, 0, direction, false);
846 }
847 EXPORT_SYMBOL(debug_dma_sync_single_for_device);
848
849 void debug_dma_sync_single_range_for_cpu(struct device *dev,
850 dma_addr_t dma_handle,
851 unsigned long offset, size_t size,
852 int direction)
853 {
854 if (unlikely(global_disable))
855 return;
856
857 check_sync(dev, dma_handle, size, offset, direction, true);
858 }
859 EXPORT_SYMBOL(debug_dma_sync_single_range_for_cpu);
860
861 void debug_dma_sync_single_range_for_device(struct device *dev,
862 dma_addr_t dma_handle,
863 unsigned long offset,
864 size_t size, int direction)
865 {
866 if (unlikely(global_disable))
867 return;
868
869 check_sync(dev, dma_handle, size, offset, direction, false);
870 }
871 EXPORT_SYMBOL(debug_dma_sync_single_range_for_device);
872
873 void debug_dma_sync_sg_for_cpu(struct device *dev, struct scatterlist *sg,
874 int nelems, int direction)
875 {
876 struct scatterlist *s;
877 int i;
878
879 if (unlikely(global_disable))
880 return;
881
882 for_each_sg(sg, s, nelems, i) {
883 check_sync(dev, s->dma_address, s->dma_length, 0,
884 direction, true);
885 }
886 }
887 EXPORT_SYMBOL(debug_dma_sync_sg_for_cpu);
888
889 void debug_dma_sync_sg_for_device(struct device *dev, struct scatterlist *sg,
890 int nelems, int direction)
891 {
892 struct scatterlist *s;
893 int i;
894
895 if (unlikely(global_disable))
896 return;
897
898 for_each_sg(sg, s, nelems, i) {
899 check_sync(dev, s->dma_address, s->dma_length, 0,
900 direction, false);
901 }
902 }
903 EXPORT_SYMBOL(debug_dma_sync_sg_for_device);
904
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