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/uaccess.h>
27 #include <linux/device.h>
28 #include <linux/types.h>
29 #include <linux/sched.h>
30 #include <linux/ctype.h>
31 #include <linux/list.h>
32 #include <linux/slab.h>
34 #include <asm/sections.h>
36 #define HASH_SIZE 1024ULL
37 #define HASH_FN_SHIFT 13
38 #define HASH_FN_MASK (HASH_SIZE - 1)
47 #define DMA_DEBUG_STACKTRACE_ENTRIES 5
49 struct dma_debug_entry {
50 struct list_head list;
59 #ifdef CONFIG_STACKTRACE
60 struct stack_trace stacktrace;
61 unsigned long st_entries[DMA_DEBUG_STACKTRACE_ENTRIES];
66 struct list_head list;
68 } ____cacheline_aligned_in_smp;
70 /* Hash list to save the allocated dma addresses */
71 static struct hash_bucket dma_entry_hash[HASH_SIZE];
72 /* List of pre-allocated dma_debug_entry's */
73 static LIST_HEAD(free_entries);
74 /* Lock for the list above */
75 static DEFINE_SPINLOCK(free_entries_lock);
77 /* Global disable flag - will be set in case of an error */
78 static bool global_disable __read_mostly;
80 /* Global error count */
81 static u32 error_count;
83 /* Global error show enable*/
84 static u32 show_all_errors __read_mostly;
85 /* Number of errors to show */
86 static u32 show_num_errors = 1;
88 static u32 num_free_entries;
89 static u32 min_free_entries;
90 static u32 nr_total_entries;
92 /* number of preallocated entries requested by kernel cmdline */
93 static u32 req_entries;
95 /* debugfs dentry's for the stuff above */
96 static struct dentry *dma_debug_dent __read_mostly;
97 static struct dentry *global_disable_dent __read_mostly;
98 static struct dentry *error_count_dent __read_mostly;
99 static struct dentry *show_all_errors_dent __read_mostly;
100 static struct dentry *show_num_errors_dent __read_mostly;
101 static struct dentry *num_free_entries_dent __read_mostly;
102 static struct dentry *min_free_entries_dent __read_mostly;
103 static struct dentry *filter_dent __read_mostly;
105 /* per-driver filter related state */
107 #define NAME_MAX_LEN 64
109 static char current_driver_name[NAME_MAX_LEN] __read_mostly;
110 static struct device_driver *current_driver __read_mostly;
112 static DEFINE_RWLOCK(driver_name_lock);
114 static const char *type2name[4] = { "single", "page",
115 "scather-gather", "coherent" };
117 static const char *dir2name[4] = { "DMA_BIDIRECTIONAL", "DMA_TO_DEVICE",
118 "DMA_FROM_DEVICE", "DMA_NONE" };
120 /* little merge helper - remove it after the merge window */
121 #ifndef BUS_NOTIFY_UNBOUND_DRIVER
122 #define BUS_NOTIFY_UNBOUND_DRIVER 0x0005
126 * The access to some variables in this macro is racy. We can't use atomic_t
127 * here because all these variables are exported to debugfs. Some of them even
128 * writeable. This is also the reason why a lock won't help much. But anyway,
129 * the races are no big deal. Here is why:
131 * error_count: the addition is racy, but the worst thing that can happen is
132 * that we don't count some errors
133 * show_num_errors: the subtraction is racy. Also no big deal because in
134 * worst case this will result in one warning more in the
135 * system log than the user configured. This variable is
136 * writeable via debugfs.
138 static inline void dump_entry_trace(struct dma_debug_entry *entry)
140 #ifdef CONFIG_STACKTRACE
142 printk(KERN_WARNING "Mapped at:\n");
143 print_stack_trace(&entry->stacktrace, 0);
148 static bool driver_filter(struct device *dev)
150 /* driver filter off */
151 if (likely(!current_driver_name[0]))
154 /* driver filter on and initialized */
155 if (current_driver && dev->driver == current_driver)
158 /* driver filter on but not yet initialized */
159 if (!current_driver && current_driver_name[0]) {
160 struct device_driver *drv = get_driver(dev->driver);
167 /* lock to protect against change of current_driver_name */
168 read_lock_irqsave(&driver_name_lock, flags);
171 strncmp(current_driver_name, drv->name,
172 NAME_MAX_LEN-1) == 0) {
173 current_driver = drv;
177 read_unlock_irqrestore(&driver_name_lock, flags);
186 #define err_printk(dev, entry, format, arg...) do { \
188 if (driver_filter(dev) && \
189 (show_all_errors || show_num_errors > 0)) { \
190 WARN(1, "%s %s: " format, \
191 dev_driver_string(dev), \
192 dev_name(dev) , ## arg); \
193 dump_entry_trace(entry); \
195 if (!show_all_errors && show_num_errors > 0) \
196 show_num_errors -= 1; \
200 * Hash related functions
202 * Every DMA-API request is saved into a struct dma_debug_entry. To
203 * have quick access to these structs they are stored into a hash.
205 static int hash_fn(struct dma_debug_entry *entry)
208 * Hash function is based on the dma address.
209 * We use bits 20-27 here as the index into the hash
211 return (entry->dev_addr >> HASH_FN_SHIFT) & HASH_FN_MASK;
215 * Request exclusive access to a hash bucket for a given dma_debug_entry.
217 static struct hash_bucket *get_hash_bucket(struct dma_debug_entry *entry,
218 unsigned long *flags)
220 int idx = hash_fn(entry);
221 unsigned long __flags;
223 spin_lock_irqsave(&dma_entry_hash[idx].lock, __flags);
225 return &dma_entry_hash[idx];
229 * Give up exclusive access to the hash bucket
231 static void put_hash_bucket(struct hash_bucket *bucket,
232 unsigned long *flags)
234 unsigned long __flags = *flags;
236 spin_unlock_irqrestore(&bucket->lock, __flags);
240 * Search a given entry in the hash bucket list
242 static struct dma_debug_entry *hash_bucket_find(struct hash_bucket *bucket,
243 struct dma_debug_entry *ref)
245 struct dma_debug_entry *entry;
247 list_for_each_entry(entry, &bucket->list, list) {
248 if ((entry->dev_addr == ref->dev_addr) &&
249 (entry->dev == ref->dev))
257 * Add an entry to a hash bucket
259 static void hash_bucket_add(struct hash_bucket *bucket,
260 struct dma_debug_entry *entry)
262 list_add_tail(&entry->list, &bucket->list);
266 * Remove entry from a hash bucket list
268 static void hash_bucket_del(struct dma_debug_entry *entry)
270 list_del(&entry->list);
274 * Dump mapping entries for debugging purposes
276 void debug_dma_dump_mappings(struct device *dev)
280 for (idx = 0; idx < HASH_SIZE; idx++) {
281 struct hash_bucket *bucket = &dma_entry_hash[idx];
282 struct dma_debug_entry *entry;
285 spin_lock_irqsave(&bucket->lock, flags);
287 list_for_each_entry(entry, &bucket->list, list) {
288 if (!dev || dev == entry->dev) {
290 "%s idx %d P=%Lx D=%Lx L=%Lx %s\n",
291 type2name[entry->type], idx,
292 (unsigned long long)entry->paddr,
293 entry->dev_addr, entry->size,
294 dir2name[entry->direction]);
298 spin_unlock_irqrestore(&bucket->lock, flags);
301 EXPORT_SYMBOL(debug_dma_dump_mappings);
304 * Wrapper function for adding an entry to the hash.
305 * This function takes care of locking itself.
307 static void add_dma_entry(struct dma_debug_entry *entry)
309 struct hash_bucket *bucket;
312 bucket = get_hash_bucket(entry, &flags);
313 hash_bucket_add(bucket, entry);
314 put_hash_bucket(bucket, &flags);
317 static struct dma_debug_entry *__dma_entry_alloc(void)
319 struct dma_debug_entry *entry;
321 entry = list_entry(free_entries.next, struct dma_debug_entry, list);
322 list_del(&entry->list);
323 memset(entry, 0, sizeof(*entry));
325 num_free_entries -= 1;
326 if (num_free_entries < min_free_entries)
327 min_free_entries = num_free_entries;
332 /* struct dma_entry allocator
334 * The next two functions implement the allocator for
335 * struct dma_debug_entries.
337 static struct dma_debug_entry *dma_entry_alloc(void)
339 struct dma_debug_entry *entry = NULL;
342 spin_lock_irqsave(&free_entries_lock, flags);
344 if (list_empty(&free_entries)) {
345 printk(KERN_ERR "DMA-API: debugging out of memory "
347 global_disable = true;
351 entry = __dma_entry_alloc();
353 #ifdef CONFIG_STACKTRACE
354 entry->stacktrace.max_entries = DMA_DEBUG_STACKTRACE_ENTRIES;
355 entry->stacktrace.entries = entry->st_entries;
356 entry->stacktrace.skip = 2;
357 save_stack_trace(&entry->stacktrace);
361 spin_unlock_irqrestore(&free_entries_lock, flags);
366 static void dma_entry_free(struct dma_debug_entry *entry)
371 * add to beginning of the list - this way the entries are
372 * more likely cache hot when they are reallocated.
374 spin_lock_irqsave(&free_entries_lock, flags);
375 list_add(&entry->list, &free_entries);
376 num_free_entries += 1;
377 spin_unlock_irqrestore(&free_entries_lock, flags);
380 int dma_debug_resize_entries(u32 num_entries)
382 int i, delta, ret = 0;
384 struct dma_debug_entry *entry;
387 spin_lock_irqsave(&free_entries_lock, flags);
389 if (nr_total_entries < num_entries) {
390 delta = num_entries - nr_total_entries;
392 spin_unlock_irqrestore(&free_entries_lock, flags);
394 for (i = 0; i < delta; i++) {
395 entry = kzalloc(sizeof(*entry), GFP_KERNEL);
399 list_add_tail(&entry->list, &tmp);
402 spin_lock_irqsave(&free_entries_lock, flags);
404 list_splice(&tmp, &free_entries);
405 nr_total_entries += i;
406 num_free_entries += i;
408 delta = nr_total_entries - num_entries;
410 for (i = 0; i < delta && !list_empty(&free_entries); i++) {
411 entry = __dma_entry_alloc();
415 nr_total_entries -= i;
418 if (nr_total_entries != num_entries)
421 spin_unlock_irqrestore(&free_entries_lock, flags);
425 EXPORT_SYMBOL(dma_debug_resize_entries);
428 * DMA-API debugging init code
430 * The init code does two things:
431 * 1. Initialize core data structures
432 * 2. Preallocate a given number of dma_debug_entry structs
435 static int prealloc_memory(u32 num_entries)
437 struct dma_debug_entry *entry, *next_entry;
440 for (i = 0; i < num_entries; ++i) {
441 entry = kzalloc(sizeof(*entry), GFP_KERNEL);
445 list_add_tail(&entry->list, &free_entries);
448 num_free_entries = num_entries;
449 min_free_entries = num_entries;
451 printk(KERN_INFO "DMA-API: preallocated %d debug entries\n",
458 list_for_each_entry_safe(entry, next_entry, &free_entries, list) {
459 list_del(&entry->list);
466 static ssize_t filter_read(struct file *file, char __user *user_buf,
467 size_t count, loff_t *ppos)
470 char buf[NAME_MAX_LEN + 1];
473 if (!current_driver_name[0])
477 * We can't copy to userspace directly because current_driver_name can
478 * only be read under the driver_name_lock with irqs disabled. So
479 * create a temporary copy first.
481 read_lock_irqsave(&driver_name_lock, flags);
482 len = scnprintf(buf, NAME_MAX_LEN + 1, "%s\n", current_driver_name);
483 read_unlock_irqrestore(&driver_name_lock, flags);
485 return simple_read_from_buffer(user_buf, count, ppos, buf, len);
488 static ssize_t filter_write(struct file *file, const char __user *userbuf,
489 size_t count, loff_t *ppos)
492 char buf[NAME_MAX_LEN];
493 size_t len = NAME_MAX_LEN - 1;
497 * We can't copy from userspace directly. Access to
498 * current_driver_name is protected with a write_lock with irqs
499 * disabled. Since copy_from_user can fault and may sleep we
500 * need to copy to temporary buffer first
502 len = min(count, len);
503 if (copy_from_user(buf, userbuf, len))
508 write_lock_irqsave(&driver_name_lock, flags);
510 /* Now handle the string we got from userspace very carefully.
512 * - only use the first token we got
513 * - token delimiter is everything looking like a space
514 * character (' ', '\n', '\t' ...)
517 if (!isalnum(buf[0])) {
519 If the first character userspace gave us is not
520 * alphanumerical then assume the filter should be
523 if (current_driver_name[0])
524 printk(KERN_INFO "DMA-API: switching off dma-debug "
526 current_driver_name[0] = 0;
527 current_driver = NULL;
532 * Now parse out the first token and use it as the name for the
533 * driver to filter for.
535 for (i = 0; i < NAME_MAX_LEN; ++i) {
536 current_driver_name[i] = buf[i];
537 if (isspace(buf[i]) || buf[i] == ' ' || buf[i] == 0)
540 current_driver_name[i] = 0;
541 current_driver = NULL;
543 printk(KERN_INFO "DMA-API: enable driver filter for driver [%s]\n",
544 current_driver_name);
547 write_unlock_irqrestore(&driver_name_lock, flags);
552 const struct file_operations filter_fops = {
554 .write = filter_write,
557 static int dma_debug_fs_init(void)
559 dma_debug_dent = debugfs_create_dir("dma-api", NULL);
560 if (!dma_debug_dent) {
561 printk(KERN_ERR "DMA-API: can not create debugfs directory\n");
565 global_disable_dent = debugfs_create_bool("disabled", 0444,
567 (u32 *)&global_disable);
568 if (!global_disable_dent)
571 error_count_dent = debugfs_create_u32("error_count", 0444,
572 dma_debug_dent, &error_count);
573 if (!error_count_dent)
576 show_all_errors_dent = debugfs_create_u32("all_errors", 0644,
579 if (!show_all_errors_dent)
582 show_num_errors_dent = debugfs_create_u32("num_errors", 0644,
585 if (!show_num_errors_dent)
588 num_free_entries_dent = debugfs_create_u32("num_free_entries", 0444,
591 if (!num_free_entries_dent)
594 min_free_entries_dent = debugfs_create_u32("min_free_entries", 0444,
597 if (!min_free_entries_dent)
600 filter_dent = debugfs_create_file("driver_filter", 0644,
601 dma_debug_dent, NULL, &filter_fops);
608 debugfs_remove_recursive(dma_debug_dent);
613 static int device_dma_allocations(struct device *dev)
615 struct dma_debug_entry *entry;
619 for (i = 0; i < HASH_SIZE; ++i) {
620 spin_lock_irqsave(&dma_entry_hash[i].lock, flags);
621 list_for_each_entry(entry, &dma_entry_hash[i].list, list) {
622 if (entry->dev == dev)
625 spin_unlock_irqrestore(&dma_entry_hash[i].lock, flags);
631 static int dma_debug_device_change(struct notifier_block *nb,
632 unsigned long action, void *data)
634 struct device *dev = data;
639 case BUS_NOTIFY_UNBOUND_DRIVER:
640 count = device_dma_allocations(dev);
643 err_printk(dev, NULL, "DMA-API: device driver has pending "
644 "DMA allocations while released from device "
645 "[count=%d]\n", count);
654 void dma_debug_add_bus(struct bus_type *bus)
656 struct notifier_block *nb;
658 nb = kzalloc(sizeof(struct notifier_block), GFP_KERNEL);
660 printk(KERN_ERR "dma_debug_add_bus: out of memory\n");
664 nb->notifier_call = dma_debug_device_change;
666 bus_register_notifier(bus, nb);
670 * Let the architectures decide how many entries should be preallocated.
672 void dma_debug_init(u32 num_entries)
679 for (i = 0; i < HASH_SIZE; ++i) {
680 INIT_LIST_HEAD(&dma_entry_hash[i].list);
681 dma_entry_hash[i].lock = SPIN_LOCK_UNLOCKED;
684 if (dma_debug_fs_init() != 0) {
685 printk(KERN_ERR "DMA-API: error creating debugfs entries "
687 global_disable = true;
693 num_entries = req_entries;
695 if (prealloc_memory(num_entries) != 0) {
696 printk(KERN_ERR "DMA-API: debugging out of memory error "
698 global_disable = true;
703 nr_total_entries = num_free_entries;
705 printk(KERN_INFO "DMA-API: debugging enabled by kernel config\n");
708 static __init int dma_debug_cmdline(char *str)
713 if (strncmp(str, "off", 3) == 0) {
714 printk(KERN_INFO "DMA-API: debugging disabled on kernel "
716 global_disable = true;
722 static __init int dma_debug_entries_cmdline(char *str)
729 res = get_option(&str, &req_entries);
737 __setup("dma_debug=", dma_debug_cmdline);
738 __setup("dma_debug_entries=", dma_debug_entries_cmdline);
740 static void check_unmap(struct dma_debug_entry *ref)
742 struct dma_debug_entry *entry;
743 struct hash_bucket *bucket;
746 if (dma_mapping_error(ref->dev, ref->dev_addr)) {
747 err_printk(ref->dev, NULL, "DMA-API: device driver tries "
748 "to free an invalid DMA memory address\n");
752 bucket = get_hash_bucket(ref, &flags);
753 entry = hash_bucket_find(bucket, ref);
756 err_printk(ref->dev, NULL, "DMA-API: device driver tries "
757 "to free DMA memory it has not allocated "
758 "[device address=0x%016llx] [size=%llu bytes]\n",
759 ref->dev_addr, ref->size);
763 if (ref->size != entry->size) {
764 err_printk(ref->dev, entry, "DMA-API: device driver frees "
765 "DMA memory with different size "
766 "[device address=0x%016llx] [map size=%llu bytes] "
767 "[unmap size=%llu bytes]\n",
768 ref->dev_addr, entry->size, ref->size);
771 if (ref->type != entry->type) {
772 err_printk(ref->dev, entry, "DMA-API: device driver frees "
773 "DMA memory with wrong function "
774 "[device address=0x%016llx] [size=%llu bytes] "
775 "[mapped as %s] [unmapped as %s]\n",
776 ref->dev_addr, ref->size,
777 type2name[entry->type], type2name[ref->type]);
778 } else if ((entry->type == dma_debug_coherent) &&
779 (ref->paddr != entry->paddr)) {
780 err_printk(ref->dev, entry, "DMA-API: device driver frees "
781 "DMA memory with different CPU address "
782 "[device address=0x%016llx] [size=%llu bytes] "
783 "[cpu alloc address=%p] [cpu free address=%p]",
784 ref->dev_addr, ref->size,
785 (void *)entry->paddr, (void *)ref->paddr);
788 if (ref->sg_call_ents && ref->type == dma_debug_sg &&
789 ref->sg_call_ents != entry->sg_call_ents) {
790 err_printk(ref->dev, entry, "DMA-API: device driver frees "
791 "DMA sg list with different entry count "
792 "[map count=%d] [unmap count=%d]\n",
793 entry->sg_call_ents, ref->sg_call_ents);
797 * This may be no bug in reality - but most implementations of the
798 * DMA API don't handle this properly, so check for it here
800 if (ref->direction != entry->direction) {
801 err_printk(ref->dev, entry, "DMA-API: device driver frees "
802 "DMA memory with different direction "
803 "[device address=0x%016llx] [size=%llu bytes] "
804 "[mapped with %s] [unmapped with %s]\n",
805 ref->dev_addr, ref->size,
806 dir2name[entry->direction],
807 dir2name[ref->direction]);
810 hash_bucket_del(entry);
811 dma_entry_free(entry);
814 put_hash_bucket(bucket, &flags);
817 static void check_for_stack(struct device *dev, void *addr)
819 if (object_is_on_stack(addr))
820 err_printk(dev, NULL, "DMA-API: device driver maps memory from"
821 "stack [addr=%p]\n", addr);
824 static inline bool overlap(void *addr, u64 size, void *start, void *end)
826 void *addr2 = (char *)addr + size;
828 return ((addr >= start && addr < end) ||
829 (addr2 >= start && addr2 < end) ||
830 ((addr < start) && (addr2 >= end)));
833 static void check_for_illegal_area(struct device *dev, void *addr, u64 size)
835 if (overlap(addr, size, _text, _etext) ||
836 overlap(addr, size, __start_rodata, __end_rodata))
837 err_printk(dev, NULL, "DMA-API: device driver maps "
838 "memory from kernel text or rodata "
839 "[addr=%p] [size=%llu]\n", addr, size);
842 static void check_sync(struct device *dev, dma_addr_t addr,
843 u64 size, u64 offset, int direction, bool to_cpu)
845 struct dma_debug_entry ref = {
849 .direction = direction,
851 struct dma_debug_entry *entry;
852 struct hash_bucket *bucket;
855 bucket = get_hash_bucket(&ref, &flags);
857 entry = hash_bucket_find(bucket, &ref);
860 err_printk(dev, NULL, "DMA-API: device driver tries "
861 "to sync DMA memory it has not allocated "
862 "[device address=0x%016llx] [size=%llu bytes]\n",
863 (unsigned long long)addr, size);
867 if ((offset + size) > entry->size) {
868 err_printk(dev, entry, "DMA-API: device driver syncs"
869 " DMA memory outside allocated range "
870 "[device address=0x%016llx] "
871 "[allocation size=%llu bytes] [sync offset=%llu] "
872 "[sync size=%llu]\n", entry->dev_addr, entry->size,
876 if (direction != entry->direction) {
877 err_printk(dev, entry, "DMA-API: device driver syncs "
878 "DMA memory with different direction "
879 "[device address=0x%016llx] [size=%llu bytes] "
880 "[mapped with %s] [synced with %s]\n",
881 (unsigned long long)addr, entry->size,
882 dir2name[entry->direction],
883 dir2name[direction]);
886 if (entry->direction == DMA_BIDIRECTIONAL)
889 if (to_cpu && !(entry->direction == DMA_FROM_DEVICE) &&
890 !(direction == DMA_TO_DEVICE))
891 err_printk(dev, entry, "DMA-API: device driver syncs "
892 "device read-only DMA memory for cpu "
893 "[device address=0x%016llx] [size=%llu bytes] "
894 "[mapped with %s] [synced with %s]\n",
895 (unsigned long long)addr, entry->size,
896 dir2name[entry->direction],
897 dir2name[direction]);
899 if (!to_cpu && !(entry->direction == DMA_TO_DEVICE) &&
900 !(direction == DMA_FROM_DEVICE))
901 err_printk(dev, entry, "DMA-API: device driver syncs "
902 "device write-only DMA memory to device "
903 "[device address=0x%016llx] [size=%llu bytes] "
904 "[mapped with %s] [synced with %s]\n",
905 (unsigned long long)addr, entry->size,
906 dir2name[entry->direction],
907 dir2name[direction]);
910 put_hash_bucket(bucket, &flags);
914 void debug_dma_map_page(struct device *dev, struct page *page, size_t offset,
915 size_t size, int direction, dma_addr_t dma_addr,
918 struct dma_debug_entry *entry;
920 if (unlikely(global_disable))
923 if (unlikely(dma_mapping_error(dev, dma_addr)))
926 entry = dma_entry_alloc();
931 entry->type = dma_debug_page;
932 entry->paddr = page_to_phys(page) + offset;
933 entry->dev_addr = dma_addr;
935 entry->direction = direction;
938 entry->type = dma_debug_single;
940 if (!PageHighMem(page)) {
941 void *addr = ((char *)page_address(page)) + offset;
942 check_for_stack(dev, addr);
943 check_for_illegal_area(dev, addr, size);
946 add_dma_entry(entry);
948 EXPORT_SYMBOL(debug_dma_map_page);
950 void debug_dma_unmap_page(struct device *dev, dma_addr_t addr,
951 size_t size, int direction, bool map_single)
953 struct dma_debug_entry ref = {
954 .type = dma_debug_page,
958 .direction = direction,
961 if (unlikely(global_disable))
965 ref.type = dma_debug_single;
969 EXPORT_SYMBOL(debug_dma_unmap_page);
971 void debug_dma_map_sg(struct device *dev, struct scatterlist *sg,
972 int nents, int mapped_ents, int direction)
974 struct dma_debug_entry *entry;
975 struct scatterlist *s;
978 if (unlikely(global_disable))
981 for_each_sg(sg, s, mapped_ents, i) {
982 entry = dma_entry_alloc();
986 entry->type = dma_debug_sg;
988 entry->paddr = sg_phys(s);
989 entry->size = sg_dma_len(s);
990 entry->dev_addr = sg_dma_address(s);
991 entry->direction = direction;
992 entry->sg_call_ents = nents;
993 entry->sg_mapped_ents = mapped_ents;
995 if (!PageHighMem(sg_page(s))) {
996 check_for_stack(dev, sg_virt(s));
997 check_for_illegal_area(dev, sg_virt(s), sg_dma_len(s));
1000 add_dma_entry(entry);
1003 EXPORT_SYMBOL(debug_dma_map_sg);
1005 static int get_nr_mapped_entries(struct device *dev, struct scatterlist *s)
1007 struct dma_debug_entry *entry;
1008 struct hash_bucket *bucket;
1009 unsigned long flags;
1010 int mapped_ents = 0;
1011 struct dma_debug_entry ref;
1014 ref.dev_addr = sg_dma_address(s);
1015 ref.size = sg_dma_len(s),
1017 bucket = get_hash_bucket(&ref, &flags);
1018 entry = hash_bucket_find(bucket, &ref);
1020 mapped_ents = entry->sg_mapped_ents;
1021 put_hash_bucket(bucket, &flags);
1026 void debug_dma_unmap_sg(struct device *dev, struct scatterlist *sglist,
1027 int nelems, int dir)
1029 struct scatterlist *s;
1030 int mapped_ents = 0, i;
1032 if (unlikely(global_disable))
1035 for_each_sg(sglist, s, nelems, i) {
1037 struct dma_debug_entry ref = {
1038 .type = dma_debug_sg,
1040 .paddr = sg_phys(s),
1041 .dev_addr = sg_dma_address(s),
1042 .size = sg_dma_len(s),
1047 if (mapped_ents && i >= mapped_ents)
1051 ref.sg_call_ents = nelems;
1052 mapped_ents = get_nr_mapped_entries(dev, s);
1058 EXPORT_SYMBOL(debug_dma_unmap_sg);
1060 void debug_dma_alloc_coherent(struct device *dev, size_t size,
1061 dma_addr_t dma_addr, void *virt)
1063 struct dma_debug_entry *entry;
1065 if (unlikely(global_disable))
1068 if (unlikely(virt == NULL))
1071 entry = dma_entry_alloc();
1075 entry->type = dma_debug_coherent;
1077 entry->paddr = virt_to_phys(virt);
1079 entry->dev_addr = dma_addr;
1080 entry->direction = DMA_BIDIRECTIONAL;
1082 add_dma_entry(entry);
1084 EXPORT_SYMBOL(debug_dma_alloc_coherent);
1086 void debug_dma_free_coherent(struct device *dev, size_t size,
1087 void *virt, dma_addr_t addr)
1089 struct dma_debug_entry ref = {
1090 .type = dma_debug_coherent,
1092 .paddr = virt_to_phys(virt),
1095 .direction = DMA_BIDIRECTIONAL,
1098 if (unlikely(global_disable))
1103 EXPORT_SYMBOL(debug_dma_free_coherent);
1105 void debug_dma_sync_single_for_cpu(struct device *dev, dma_addr_t dma_handle,
1106 size_t size, int direction)
1108 if (unlikely(global_disable))
1111 check_sync(dev, dma_handle, size, 0, direction, true);
1113 EXPORT_SYMBOL(debug_dma_sync_single_for_cpu);
1115 void debug_dma_sync_single_for_device(struct device *dev,
1116 dma_addr_t dma_handle, size_t size,
1119 if (unlikely(global_disable))
1122 check_sync(dev, dma_handle, size, 0, direction, false);
1124 EXPORT_SYMBOL(debug_dma_sync_single_for_device);
1126 void debug_dma_sync_single_range_for_cpu(struct device *dev,
1127 dma_addr_t dma_handle,
1128 unsigned long offset, size_t size,
1131 if (unlikely(global_disable))
1134 check_sync(dev, dma_handle, size, offset, direction, true);
1136 EXPORT_SYMBOL(debug_dma_sync_single_range_for_cpu);
1138 void debug_dma_sync_single_range_for_device(struct device *dev,
1139 dma_addr_t dma_handle,
1140 unsigned long offset,
1141 size_t size, int direction)
1143 if (unlikely(global_disable))
1146 check_sync(dev, dma_handle, size, offset, direction, false);
1148 EXPORT_SYMBOL(debug_dma_sync_single_range_for_device);
1150 void debug_dma_sync_sg_for_cpu(struct device *dev, struct scatterlist *sg,
1151 int nelems, int direction)
1153 struct scatterlist *s;
1154 int mapped_ents = 0, i;
1156 if (unlikely(global_disable))
1159 for_each_sg(sg, s, nelems, i) {
1161 mapped_ents = get_nr_mapped_entries(dev, s);
1163 if (i >= mapped_ents)
1166 check_sync(dev, sg_dma_address(s), sg_dma_len(s), 0,
1170 EXPORT_SYMBOL(debug_dma_sync_sg_for_cpu);
1172 void debug_dma_sync_sg_for_device(struct device *dev, struct scatterlist *sg,
1173 int nelems, int direction)
1175 struct scatterlist *s;
1176 int mapped_ents = 0, i;
1178 if (unlikely(global_disable))
1181 for_each_sg(sg, s, nelems, i) {
1183 mapped_ents = get_nr_mapped_entries(dev, s);
1185 if (i >= mapped_ents)
1188 check_sync(dev, sg_dma_address(s), sg_dma_len(s), 0,
1192 EXPORT_SYMBOL(debug_dma_sync_sg_for_device);
1194 static int __init dma_debug_driver_setup(char *str)
1198 for (i = 0; i < NAME_MAX_LEN - 1; ++i, ++str) {
1199 current_driver_name[i] = *str;
1204 if (current_driver_name[0])
1205 printk(KERN_INFO "DMA-API: enable driver filter for "
1206 "driver [%s]\n", current_driver_name);
1211 __setup("dma_debug_driver=", dma_debug_driver_setup);