2 * Copyright (C) 2008 Advanced Micro Devices, Inc.
4 * Author: Joerg Roedel <joerg.roedel@amd.com>
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.
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.
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
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>
32 #include <asm/sections.h>
34 #define HASH_SIZE 1024ULL
35 #define HASH_FN_SHIFT 13
36 #define HASH_FN_MASK (HASH_SIZE - 1)
45 #define DMA_DEBUG_STACKTRACE_ENTRIES 5
47 struct dma_debug_entry {
48 struct list_head list;
57 #ifdef CONFIG_STACKTRACE
58 struct stack_trace stacktrace;
59 unsigned long st_entries[DMA_DEBUG_STACKTRACE_ENTRIES];
64 struct list_head list;
66 } ____cacheline_aligned_in_smp;
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);
75 /* Global disable flag - will be set in case of an error */
76 static bool global_disable __read_mostly;
78 /* Global error count */
79 static u32 error_count;
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;
86 static u32 num_free_entries;
87 static u32 min_free_entries;
88 static u32 nr_total_entries;
90 /* number of preallocated entries requested by kernel cmdline */
91 static u32 req_entries;
93 /* debugfs dentry's for the stuff above */
94 static struct dentry *dma_debug_dent __read_mostly;
95 static struct dentry *global_disable_dent __read_mostly;
96 static struct dentry *error_count_dent __read_mostly;
97 static struct dentry *show_all_errors_dent __read_mostly;
98 static struct dentry *show_num_errors_dent __read_mostly;
99 static struct dentry *num_free_entries_dent __read_mostly;
100 static struct dentry *min_free_entries_dent __read_mostly;
102 static const char *type2name[4] = { "single", "page",
103 "scather-gather", "coherent" };
105 static const char *dir2name[4] = { "DMA_BIDIRECTIONAL", "DMA_TO_DEVICE",
106 "DMA_FROM_DEVICE", "DMA_NONE" };
108 /* little merge helper - remove it after the merge window */
109 #ifndef BUS_NOTIFY_UNBOUND_DRIVER
110 #define BUS_NOTIFY_UNBOUND_DRIVER 0x0005
114 * The access to some variables in this macro is racy. We can't use atomic_t
115 * here because all these variables are exported to debugfs. Some of them even
116 * writeable. This is also the reason why a lock won't help much. But anyway,
117 * the races are no big deal. Here is why:
119 * error_count: the addition is racy, but the worst thing that can happen is
120 * that we don't count some errors
121 * show_num_errors: the subtraction is racy. Also no big deal because in
122 * worst case this will result in one warning more in the
123 * system log than the user configured. This variable is
124 * writeable via debugfs.
126 static inline void dump_entry_trace(struct dma_debug_entry *entry)
128 #ifdef CONFIG_STACKTRACE
130 printk(KERN_WARNING "Mapped at:\n");
131 print_stack_trace(&entry->stacktrace, 0);
136 #define err_printk(dev, entry, format, arg...) do { \
138 if (show_all_errors || show_num_errors > 0) { \
139 WARN(1, "%s %s: " format, \
140 dev_driver_string(dev), \
141 dev_name(dev) , ## arg); \
142 dump_entry_trace(entry); \
144 if (!show_all_errors && show_num_errors > 0) \
145 show_num_errors -= 1; \
149 * Hash related functions
151 * Every DMA-API request is saved into a struct dma_debug_entry. To
152 * have quick access to these structs they are stored into a hash.
154 static int hash_fn(struct dma_debug_entry *entry)
157 * Hash function is based on the dma address.
158 * We use bits 20-27 here as the index into the hash
160 return (entry->dev_addr >> HASH_FN_SHIFT) & HASH_FN_MASK;
164 * Request exclusive access to a hash bucket for a given dma_debug_entry.
166 static struct hash_bucket *get_hash_bucket(struct dma_debug_entry *entry,
167 unsigned long *flags)
169 int idx = hash_fn(entry);
170 unsigned long __flags;
172 spin_lock_irqsave(&dma_entry_hash[idx].lock, __flags);
174 return &dma_entry_hash[idx];
178 * Give up exclusive access to the hash bucket
180 static void put_hash_bucket(struct hash_bucket *bucket,
181 unsigned long *flags)
183 unsigned long __flags = *flags;
185 spin_unlock_irqrestore(&bucket->lock, __flags);
189 * Search a given entry in the hash bucket list
191 static struct dma_debug_entry *hash_bucket_find(struct hash_bucket *bucket,
192 struct dma_debug_entry *ref)
194 struct dma_debug_entry *entry;
196 list_for_each_entry(entry, &bucket->list, list) {
197 if ((entry->dev_addr == ref->dev_addr) &&
198 (entry->dev == ref->dev))
206 * Add an entry to a hash bucket
208 static void hash_bucket_add(struct hash_bucket *bucket,
209 struct dma_debug_entry *entry)
211 list_add_tail(&entry->list, &bucket->list);
215 * Remove entry from a hash bucket list
217 static void hash_bucket_del(struct dma_debug_entry *entry)
219 list_del(&entry->list);
223 * Dump mapping entries for debugging purposes
225 void debug_dma_dump_mappings(struct device *dev)
229 for (idx = 0; idx < HASH_SIZE; idx++) {
230 struct hash_bucket *bucket = &dma_entry_hash[idx];
231 struct dma_debug_entry *entry;
234 spin_lock_irqsave(&bucket->lock, flags);
236 list_for_each_entry(entry, &bucket->list, list) {
237 if (!dev || dev == entry->dev) {
239 "%s idx %d P=%Lx D=%Lx L=%Lx %s\n",
240 type2name[entry->type], idx,
241 (unsigned long long)entry->paddr,
242 entry->dev_addr, entry->size,
243 dir2name[entry->direction]);
247 spin_unlock_irqrestore(&bucket->lock, flags);
250 EXPORT_SYMBOL(debug_dma_dump_mappings);
253 * Wrapper function for adding an entry to the hash.
254 * This function takes care of locking itself.
256 static void add_dma_entry(struct dma_debug_entry *entry)
258 struct hash_bucket *bucket;
261 bucket = get_hash_bucket(entry, &flags);
262 hash_bucket_add(bucket, entry);
263 put_hash_bucket(bucket, &flags);
266 static struct dma_debug_entry *__dma_entry_alloc(void)
268 struct dma_debug_entry *entry;
270 entry = list_entry(free_entries.next, struct dma_debug_entry, list);
271 list_del(&entry->list);
272 memset(entry, 0, sizeof(*entry));
274 num_free_entries -= 1;
275 if (num_free_entries < min_free_entries)
276 min_free_entries = num_free_entries;
281 /* struct dma_entry allocator
283 * The next two functions implement the allocator for
284 * struct dma_debug_entries.
286 static struct dma_debug_entry *dma_entry_alloc(void)
288 struct dma_debug_entry *entry = NULL;
291 spin_lock_irqsave(&free_entries_lock, flags);
293 if (list_empty(&free_entries)) {
294 printk(KERN_ERR "DMA-API: debugging out of memory "
296 global_disable = true;
300 entry = __dma_entry_alloc();
302 #ifdef CONFIG_STACKTRACE
303 entry->stacktrace.max_entries = DMA_DEBUG_STACKTRACE_ENTRIES;
304 entry->stacktrace.entries = entry->st_entries;
305 entry->stacktrace.skip = 2;
306 save_stack_trace(&entry->stacktrace);
310 spin_unlock_irqrestore(&free_entries_lock, flags);
315 static void dma_entry_free(struct dma_debug_entry *entry)
320 * add to beginning of the list - this way the entries are
321 * more likely cache hot when they are reallocated.
323 spin_lock_irqsave(&free_entries_lock, flags);
324 list_add(&entry->list, &free_entries);
325 num_free_entries += 1;
326 spin_unlock_irqrestore(&free_entries_lock, flags);
329 int dma_debug_resize_entries(u32 num_entries)
331 int i, delta, ret = 0;
333 struct dma_debug_entry *entry;
336 spin_lock_irqsave(&free_entries_lock, flags);
338 if (nr_total_entries < num_entries) {
339 delta = num_entries - nr_total_entries;
341 spin_unlock_irqrestore(&free_entries_lock, flags);
343 for (i = 0; i < delta; i++) {
344 entry = kzalloc(sizeof(*entry), GFP_KERNEL);
348 list_add_tail(&entry->list, &tmp);
351 spin_lock_irqsave(&free_entries_lock, flags);
353 list_splice(&tmp, &free_entries);
354 nr_total_entries += i;
355 num_free_entries += i;
357 delta = nr_total_entries - num_entries;
359 for (i = 0; i < delta && !list_empty(&free_entries); i++) {
360 entry = __dma_entry_alloc();
364 nr_total_entries -= i;
367 if (nr_total_entries != num_entries)
370 spin_unlock_irqrestore(&free_entries_lock, flags);
374 EXPORT_SYMBOL(dma_debug_resize_entries);
377 * DMA-API debugging init code
379 * The init code does two things:
380 * 1. Initialize core data structures
381 * 2. Preallocate a given number of dma_debug_entry structs
384 static int prealloc_memory(u32 num_entries)
386 struct dma_debug_entry *entry, *next_entry;
389 for (i = 0; i < num_entries; ++i) {
390 entry = kzalloc(sizeof(*entry), GFP_KERNEL);
394 list_add_tail(&entry->list, &free_entries);
397 num_free_entries = num_entries;
398 min_free_entries = num_entries;
400 printk(KERN_INFO "DMA-API: preallocated %d debug entries\n",
407 list_for_each_entry_safe(entry, next_entry, &free_entries, list) {
408 list_del(&entry->list);
415 static int dma_debug_fs_init(void)
417 dma_debug_dent = debugfs_create_dir("dma-api", NULL);
418 if (!dma_debug_dent) {
419 printk(KERN_ERR "DMA-API: can not create debugfs directory\n");
423 global_disable_dent = debugfs_create_bool("disabled", 0444,
425 (u32 *)&global_disable);
426 if (!global_disable_dent)
429 error_count_dent = debugfs_create_u32("error_count", 0444,
430 dma_debug_dent, &error_count);
431 if (!error_count_dent)
434 show_all_errors_dent = debugfs_create_u32("all_errors", 0644,
437 if (!show_all_errors_dent)
440 show_num_errors_dent = debugfs_create_u32("num_errors", 0644,
443 if (!show_num_errors_dent)
446 num_free_entries_dent = debugfs_create_u32("num_free_entries", 0444,
449 if (!num_free_entries_dent)
452 min_free_entries_dent = debugfs_create_u32("min_free_entries", 0444,
455 if (!min_free_entries_dent)
461 debugfs_remove_recursive(dma_debug_dent);
466 static int device_dma_allocations(struct device *dev)
468 struct dma_debug_entry *entry;
472 for (i = 0; i < HASH_SIZE; ++i) {
473 spin_lock_irqsave(&dma_entry_hash[i].lock, flags);
474 list_for_each_entry(entry, &dma_entry_hash[i].list, list) {
475 if (entry->dev == dev)
478 spin_unlock_irqrestore(&dma_entry_hash[i].lock, flags);
484 static int dma_debug_device_change(struct notifier_block *nb,
485 unsigned long action, void *data)
487 struct device *dev = data;
492 case BUS_NOTIFY_UNBOUND_DRIVER:
493 count = device_dma_allocations(dev);
496 err_printk(dev, NULL, "DMA-API: device driver has pending "
497 "DMA allocations while released from device "
498 "[count=%d]\n", count);
507 void dma_debug_add_bus(struct bus_type *bus)
509 struct notifier_block *nb;
511 nb = kzalloc(sizeof(struct notifier_block), GFP_KERNEL);
513 printk(KERN_ERR "dma_debug_add_bus: out of memory\n");
517 nb->notifier_call = dma_debug_device_change;
519 bus_register_notifier(bus, nb);
523 * Let the architectures decide how many entries should be preallocated.
525 void dma_debug_init(u32 num_entries)
532 for (i = 0; i < HASH_SIZE; ++i) {
533 INIT_LIST_HEAD(&dma_entry_hash[i].list);
534 dma_entry_hash[i].lock = SPIN_LOCK_UNLOCKED;
537 if (dma_debug_fs_init() != 0) {
538 printk(KERN_ERR "DMA-API: error creating debugfs entries "
540 global_disable = true;
546 num_entries = req_entries;
548 if (prealloc_memory(num_entries) != 0) {
549 printk(KERN_ERR "DMA-API: debugging out of memory error "
551 global_disable = true;
556 nr_total_entries = num_free_entries;
558 printk(KERN_INFO "DMA-API: debugging enabled by kernel config\n");
561 static __init int dma_debug_cmdline(char *str)
566 if (strncmp(str, "off", 3) == 0) {
567 printk(KERN_INFO "DMA-API: debugging disabled on kernel "
569 global_disable = true;
575 static __init int dma_debug_entries_cmdline(char *str)
582 res = get_option(&str, &req_entries);
590 __setup("dma_debug=", dma_debug_cmdline);
591 __setup("dma_debug_entries=", dma_debug_entries_cmdline);
593 static void check_unmap(struct dma_debug_entry *ref)
595 struct dma_debug_entry *entry;
596 struct hash_bucket *bucket;
599 if (dma_mapping_error(ref->dev, ref->dev_addr)) {
600 err_printk(ref->dev, NULL, "DMA-API: device driver tries "
601 "to free an invalid DMA memory address\n");
605 bucket = get_hash_bucket(ref, &flags);
606 entry = hash_bucket_find(bucket, ref);
609 err_printk(ref->dev, NULL, "DMA-API: device driver tries "
610 "to free DMA memory it has not allocated "
611 "[device address=0x%016llx] [size=%llu bytes]\n",
612 ref->dev_addr, ref->size);
616 if (ref->size != entry->size) {
617 err_printk(ref->dev, entry, "DMA-API: device driver frees "
618 "DMA memory with different size "
619 "[device address=0x%016llx] [map size=%llu bytes] "
620 "[unmap size=%llu bytes]\n",
621 ref->dev_addr, entry->size, ref->size);
624 if (ref->type != entry->type) {
625 err_printk(ref->dev, entry, "DMA-API: device driver frees "
626 "DMA memory with wrong function "
627 "[device address=0x%016llx] [size=%llu bytes] "
628 "[mapped as %s] [unmapped as %s]\n",
629 ref->dev_addr, ref->size,
630 type2name[entry->type], type2name[ref->type]);
631 } else if ((entry->type == dma_debug_coherent) &&
632 (ref->paddr != entry->paddr)) {
633 err_printk(ref->dev, entry, "DMA-API: device driver frees "
634 "DMA memory with different CPU address "
635 "[device address=0x%016llx] [size=%llu bytes] "
636 "[cpu alloc address=%p] [cpu free address=%p]",
637 ref->dev_addr, ref->size,
638 (void *)entry->paddr, (void *)ref->paddr);
641 if (ref->sg_call_ents && ref->type == dma_debug_sg &&
642 ref->sg_call_ents != entry->sg_call_ents) {
643 err_printk(ref->dev, entry, "DMA-API: device driver frees "
644 "DMA sg list with different entry count "
645 "[map count=%d] [unmap count=%d]\n",
646 entry->sg_call_ents, ref->sg_call_ents);
650 * This may be no bug in reality - but most implementations of the
651 * DMA API don't handle this properly, so check for it here
653 if (ref->direction != entry->direction) {
654 err_printk(ref->dev, entry, "DMA-API: device driver frees "
655 "DMA memory with different direction "
656 "[device address=0x%016llx] [size=%llu bytes] "
657 "[mapped with %s] [unmapped with %s]\n",
658 ref->dev_addr, ref->size,
659 dir2name[entry->direction],
660 dir2name[ref->direction]);
663 hash_bucket_del(entry);
664 dma_entry_free(entry);
667 put_hash_bucket(bucket, &flags);
670 static void check_for_stack(struct device *dev, void *addr)
672 if (object_is_on_stack(addr))
673 err_printk(dev, NULL, "DMA-API: device driver maps memory from"
674 "stack [addr=%p]\n", addr);
677 static inline bool overlap(void *addr, u64 size, void *start, void *end)
679 void *addr2 = (char *)addr + size;
681 return ((addr >= start && addr < end) ||
682 (addr2 >= start && addr2 < end) ||
683 ((addr < start) && (addr2 >= end)));
686 static void check_for_illegal_area(struct device *dev, void *addr, u64 size)
688 if (overlap(addr, size, _text, _etext) ||
689 overlap(addr, size, __start_rodata, __end_rodata))
690 err_printk(dev, NULL, "DMA-API: device driver maps "
691 "memory from kernel text or rodata "
692 "[addr=%p] [size=%llu]\n", addr, size);
695 static void check_sync(struct device *dev, dma_addr_t addr,
696 u64 size, u64 offset, int direction, bool to_cpu)
698 struct dma_debug_entry ref = {
702 .direction = direction,
704 struct dma_debug_entry *entry;
705 struct hash_bucket *bucket;
708 bucket = get_hash_bucket(&ref, &flags);
710 entry = hash_bucket_find(bucket, &ref);
713 err_printk(dev, NULL, "DMA-API: device driver tries "
714 "to sync DMA memory it has not allocated "
715 "[device address=0x%016llx] [size=%llu bytes]\n",
716 (unsigned long long)addr, size);
720 if ((offset + size) > entry->size) {
721 err_printk(dev, entry, "DMA-API: device driver syncs"
722 " DMA memory outside allocated range "
723 "[device address=0x%016llx] "
724 "[allocation size=%llu bytes] [sync offset=%llu] "
725 "[sync size=%llu]\n", entry->dev_addr, entry->size,
729 if (direction != entry->direction) {
730 err_printk(dev, entry, "DMA-API: device driver syncs "
731 "DMA memory with different direction "
732 "[device address=0x%016llx] [size=%llu bytes] "
733 "[mapped with %s] [synced with %s]\n",
734 (unsigned long long)addr, entry->size,
735 dir2name[entry->direction],
736 dir2name[direction]);
739 if (entry->direction == DMA_BIDIRECTIONAL)
742 if (to_cpu && !(entry->direction == DMA_FROM_DEVICE) &&
743 !(direction == DMA_TO_DEVICE))
744 err_printk(dev, entry, "DMA-API: device driver syncs "
745 "device read-only DMA memory for cpu "
746 "[device address=0x%016llx] [size=%llu bytes] "
747 "[mapped with %s] [synced with %s]\n",
748 (unsigned long long)addr, entry->size,
749 dir2name[entry->direction],
750 dir2name[direction]);
752 if (!to_cpu && !(entry->direction == DMA_TO_DEVICE) &&
753 !(direction == DMA_FROM_DEVICE))
754 err_printk(dev, entry, "DMA-API: device driver syncs "
755 "device write-only DMA memory to device "
756 "[device address=0x%016llx] [size=%llu bytes] "
757 "[mapped with %s] [synced with %s]\n",
758 (unsigned long long)addr, entry->size,
759 dir2name[entry->direction],
760 dir2name[direction]);
763 put_hash_bucket(bucket, &flags);
767 void debug_dma_map_page(struct device *dev, struct page *page, size_t offset,
768 size_t size, int direction, dma_addr_t dma_addr,
771 struct dma_debug_entry *entry;
773 if (unlikely(global_disable))
776 if (unlikely(dma_mapping_error(dev, dma_addr)))
779 entry = dma_entry_alloc();
784 entry->type = dma_debug_page;
785 entry->paddr = page_to_phys(page) + offset;
786 entry->dev_addr = dma_addr;
788 entry->direction = direction;
791 entry->type = dma_debug_single;
793 if (!PageHighMem(page)) {
794 void *addr = ((char *)page_address(page)) + offset;
795 check_for_stack(dev, addr);
796 check_for_illegal_area(dev, addr, size);
799 add_dma_entry(entry);
801 EXPORT_SYMBOL(debug_dma_map_page);
803 void debug_dma_unmap_page(struct device *dev, dma_addr_t addr,
804 size_t size, int direction, bool map_single)
806 struct dma_debug_entry ref = {
807 .type = dma_debug_page,
811 .direction = direction,
814 if (unlikely(global_disable))
818 ref.type = dma_debug_single;
822 EXPORT_SYMBOL(debug_dma_unmap_page);
824 void debug_dma_map_sg(struct device *dev, struct scatterlist *sg,
825 int nents, int mapped_ents, int direction)
827 struct dma_debug_entry *entry;
828 struct scatterlist *s;
831 if (unlikely(global_disable))
834 for_each_sg(sg, s, mapped_ents, i) {
835 entry = dma_entry_alloc();
839 entry->type = dma_debug_sg;
841 entry->paddr = sg_phys(s);
842 entry->size = s->length;
843 entry->dev_addr = sg_dma_address(s);
844 entry->direction = direction;
845 entry->sg_call_ents = nents;
846 entry->sg_mapped_ents = mapped_ents;
848 if (!PageHighMem(sg_page(s))) {
849 check_for_stack(dev, sg_virt(s));
850 check_for_illegal_area(dev, sg_virt(s), s->length);
853 add_dma_entry(entry);
856 EXPORT_SYMBOL(debug_dma_map_sg);
858 void debug_dma_unmap_sg(struct device *dev, struct scatterlist *sglist,
861 struct dma_debug_entry *entry;
862 struct scatterlist *s;
863 int mapped_ents = 0, i;
866 if (unlikely(global_disable))
869 for_each_sg(sglist, s, nelems, i) {
871 struct dma_debug_entry ref = {
872 .type = dma_debug_sg,
875 .dev_addr = sg_dma_address(s),
881 if (mapped_ents && i >= mapped_ents)
884 if (mapped_ents == 0) {
885 struct hash_bucket *bucket;
886 ref.sg_call_ents = nelems;
887 bucket = get_hash_bucket(&ref, &flags);
888 entry = hash_bucket_find(bucket, &ref);
890 mapped_ents = entry->sg_mapped_ents;
891 put_hash_bucket(bucket, &flags);
897 EXPORT_SYMBOL(debug_dma_unmap_sg);
899 void debug_dma_alloc_coherent(struct device *dev, size_t size,
900 dma_addr_t dma_addr, void *virt)
902 struct dma_debug_entry *entry;
904 if (unlikely(global_disable))
907 if (unlikely(virt == NULL))
910 entry = dma_entry_alloc();
914 entry->type = dma_debug_coherent;
916 entry->paddr = virt_to_phys(virt);
918 entry->dev_addr = dma_addr;
919 entry->direction = DMA_BIDIRECTIONAL;
921 add_dma_entry(entry);
923 EXPORT_SYMBOL(debug_dma_alloc_coherent);
925 void debug_dma_free_coherent(struct device *dev, size_t size,
926 void *virt, dma_addr_t addr)
928 struct dma_debug_entry ref = {
929 .type = dma_debug_coherent,
931 .paddr = virt_to_phys(virt),
934 .direction = DMA_BIDIRECTIONAL,
937 if (unlikely(global_disable))
942 EXPORT_SYMBOL(debug_dma_free_coherent);
944 void debug_dma_sync_single_for_cpu(struct device *dev, dma_addr_t dma_handle,
945 size_t size, int direction)
947 if (unlikely(global_disable))
950 check_sync(dev, dma_handle, size, 0, direction, true);
952 EXPORT_SYMBOL(debug_dma_sync_single_for_cpu);
954 void debug_dma_sync_single_for_device(struct device *dev,
955 dma_addr_t dma_handle, size_t size,
958 if (unlikely(global_disable))
961 check_sync(dev, dma_handle, size, 0, direction, false);
963 EXPORT_SYMBOL(debug_dma_sync_single_for_device);
965 void debug_dma_sync_single_range_for_cpu(struct device *dev,
966 dma_addr_t dma_handle,
967 unsigned long offset, size_t size,
970 if (unlikely(global_disable))
973 check_sync(dev, dma_handle, size, offset, direction, true);
975 EXPORT_SYMBOL(debug_dma_sync_single_range_for_cpu);
977 void debug_dma_sync_single_range_for_device(struct device *dev,
978 dma_addr_t dma_handle,
979 unsigned long offset,
980 size_t size, int direction)
982 if (unlikely(global_disable))
985 check_sync(dev, dma_handle, size, offset, direction, false);
987 EXPORT_SYMBOL(debug_dma_sync_single_range_for_device);
989 void debug_dma_sync_sg_for_cpu(struct device *dev, struct scatterlist *sg,
990 int nelems, int direction)
992 struct scatterlist *s;
995 if (unlikely(global_disable))
998 for_each_sg(sg, s, nelems, i) {
999 check_sync(dev, sg_dma_address(s), s->dma_length, 0,
1003 EXPORT_SYMBOL(debug_dma_sync_sg_for_cpu);
1005 void debug_dma_sync_sg_for_device(struct device *dev, struct scatterlist *sg,
1006 int nelems, int direction)
1008 struct scatterlist *s;
1011 if (unlikely(global_disable))
1014 for_each_sg(sg, s, nelems, i) {
1015 check_sync(dev, sg_dma_address(s), s->dma_length, 0,
1019 EXPORT_SYMBOL(debug_dma_sync_sg_for_device);