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 pr_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, *ret = NULL;
246 int matches = 0, match_lvl, last_lvl = 0;
248 list_for_each_entry(entry, &bucket->list, list) {
249 if ((entry->dev_addr != ref->dev_addr) ||
250 (entry->dev != ref->dev))
254 * Some drivers map the same physical address multiple
255 * times. Without a hardware IOMMU this results in the
256 * same device addresses being put into the dma-debug
257 * hash multiple times too. This can result in false
258 * positives being reported. Therfore we implement a
259 * best-fit algorithm here which returns the entry from
260 * the hash which fits best to the reference value
261 * instead of the first-fit.
265 entry->size == ref->size ? ++match_lvl : match_lvl;
266 entry->type == ref->type ? ++match_lvl : match_lvl;
267 entry->direction == ref->direction ? ++match_lvl : match_lvl;
269 if (match_lvl == 3) {
270 /* perfect-fit - return the result */
272 } else if (match_lvl > last_lvl) {
274 * We found an entry that fits better then the
277 last_lvl = match_lvl;
283 * If we have multiple matches but no perfect-fit, just return
286 ret = (matches == 1) ? ret : NULL;
292 * Add an entry to a hash bucket
294 static void hash_bucket_add(struct hash_bucket *bucket,
295 struct dma_debug_entry *entry)
297 list_add_tail(&entry->list, &bucket->list);
301 * Remove entry from a hash bucket list
303 static void hash_bucket_del(struct dma_debug_entry *entry)
305 list_del(&entry->list);
309 * Dump mapping entries for debugging purposes
311 void debug_dma_dump_mappings(struct device *dev)
315 for (idx = 0; idx < HASH_SIZE; idx++) {
316 struct hash_bucket *bucket = &dma_entry_hash[idx];
317 struct dma_debug_entry *entry;
320 spin_lock_irqsave(&bucket->lock, flags);
322 list_for_each_entry(entry, &bucket->list, list) {
323 if (!dev || dev == entry->dev) {
325 "%s idx %d P=%Lx D=%Lx L=%Lx %s\n",
326 type2name[entry->type], idx,
327 (unsigned long long)entry->paddr,
328 entry->dev_addr, entry->size,
329 dir2name[entry->direction]);
333 spin_unlock_irqrestore(&bucket->lock, flags);
336 EXPORT_SYMBOL(debug_dma_dump_mappings);
339 * Wrapper function for adding an entry to the hash.
340 * This function takes care of locking itself.
342 static void add_dma_entry(struct dma_debug_entry *entry)
344 struct hash_bucket *bucket;
347 bucket = get_hash_bucket(entry, &flags);
348 hash_bucket_add(bucket, entry);
349 put_hash_bucket(bucket, &flags);
352 static struct dma_debug_entry *__dma_entry_alloc(void)
354 struct dma_debug_entry *entry;
356 entry = list_entry(free_entries.next, struct dma_debug_entry, list);
357 list_del(&entry->list);
358 memset(entry, 0, sizeof(*entry));
360 num_free_entries -= 1;
361 if (num_free_entries < min_free_entries)
362 min_free_entries = num_free_entries;
367 /* struct dma_entry allocator
369 * The next two functions implement the allocator for
370 * struct dma_debug_entries.
372 static struct dma_debug_entry *dma_entry_alloc(void)
374 struct dma_debug_entry *entry = NULL;
377 spin_lock_irqsave(&free_entries_lock, flags);
379 if (list_empty(&free_entries)) {
380 pr_err("DMA-API: debugging out of memory - disabling\n");
381 global_disable = true;
385 entry = __dma_entry_alloc();
387 #ifdef CONFIG_STACKTRACE
388 entry->stacktrace.max_entries = DMA_DEBUG_STACKTRACE_ENTRIES;
389 entry->stacktrace.entries = entry->st_entries;
390 entry->stacktrace.skip = 2;
391 save_stack_trace(&entry->stacktrace);
395 spin_unlock_irqrestore(&free_entries_lock, flags);
400 static void dma_entry_free(struct dma_debug_entry *entry)
405 * add to beginning of the list - this way the entries are
406 * more likely cache hot when they are reallocated.
408 spin_lock_irqsave(&free_entries_lock, flags);
409 list_add(&entry->list, &free_entries);
410 num_free_entries += 1;
411 spin_unlock_irqrestore(&free_entries_lock, flags);
414 int dma_debug_resize_entries(u32 num_entries)
416 int i, delta, ret = 0;
418 struct dma_debug_entry *entry;
421 spin_lock_irqsave(&free_entries_lock, flags);
423 if (nr_total_entries < num_entries) {
424 delta = num_entries - nr_total_entries;
426 spin_unlock_irqrestore(&free_entries_lock, flags);
428 for (i = 0; i < delta; i++) {
429 entry = kzalloc(sizeof(*entry), GFP_KERNEL);
433 list_add_tail(&entry->list, &tmp);
436 spin_lock_irqsave(&free_entries_lock, flags);
438 list_splice(&tmp, &free_entries);
439 nr_total_entries += i;
440 num_free_entries += i;
442 delta = nr_total_entries - num_entries;
444 for (i = 0; i < delta && !list_empty(&free_entries); i++) {
445 entry = __dma_entry_alloc();
449 nr_total_entries -= i;
452 if (nr_total_entries != num_entries)
455 spin_unlock_irqrestore(&free_entries_lock, flags);
459 EXPORT_SYMBOL(dma_debug_resize_entries);
462 * DMA-API debugging init code
464 * The init code does two things:
465 * 1. Initialize core data structures
466 * 2. Preallocate a given number of dma_debug_entry structs
469 static int prealloc_memory(u32 num_entries)
471 struct dma_debug_entry *entry, *next_entry;
474 for (i = 0; i < num_entries; ++i) {
475 entry = kzalloc(sizeof(*entry), GFP_KERNEL);
479 list_add_tail(&entry->list, &free_entries);
482 num_free_entries = num_entries;
483 min_free_entries = num_entries;
485 pr_info("DMA-API: preallocated %d debug entries\n", num_entries);
491 list_for_each_entry_safe(entry, next_entry, &free_entries, list) {
492 list_del(&entry->list);
499 static ssize_t filter_read(struct file *file, char __user *user_buf,
500 size_t count, loff_t *ppos)
502 char buf[NAME_MAX_LEN + 1];
506 if (!current_driver_name[0])
510 * We can't copy to userspace directly because current_driver_name can
511 * only be read under the driver_name_lock with irqs disabled. So
512 * create a temporary copy first.
514 read_lock_irqsave(&driver_name_lock, flags);
515 len = scnprintf(buf, NAME_MAX_LEN + 1, "%s\n", current_driver_name);
516 read_unlock_irqrestore(&driver_name_lock, flags);
518 return simple_read_from_buffer(user_buf, count, ppos, buf, len);
521 static ssize_t filter_write(struct file *file, const char __user *userbuf,
522 size_t count, loff_t *ppos)
524 char buf[NAME_MAX_LEN];
530 * We can't copy from userspace directly. Access to
531 * current_driver_name is protected with a write_lock with irqs
532 * disabled. Since copy_from_user can fault and may sleep we
533 * need to copy to temporary buffer first
535 len = min(count, (size_t)(NAME_MAX_LEN - 1));
536 if (copy_from_user(buf, userbuf, len))
541 write_lock_irqsave(&driver_name_lock, flags);
544 * Now handle the string we got from userspace very carefully.
546 * - only use the first token we got
547 * - token delimiter is everything looking like a space
548 * character (' ', '\n', '\t' ...)
551 if (!isalnum(buf[0])) {
553 * If the first character userspace gave us is not
554 * alphanumerical then assume the filter should be
557 if (current_driver_name[0])
558 pr_info("DMA-API: switching off dma-debug driver filter\n");
559 current_driver_name[0] = 0;
560 current_driver = NULL;
565 * Now parse out the first token and use it as the name for the
566 * driver to filter for.
568 for (i = 0; i < NAME_MAX_LEN; ++i) {
569 current_driver_name[i] = buf[i];
570 if (isspace(buf[i]) || buf[i] == ' ' || buf[i] == 0)
573 current_driver_name[i] = 0;
574 current_driver = NULL;
576 pr_info("DMA-API: enable driver filter for driver [%s]\n",
577 current_driver_name);
580 write_unlock_irqrestore(&driver_name_lock, flags);
585 const struct file_operations filter_fops = {
587 .write = filter_write,
590 static int dma_debug_fs_init(void)
592 dma_debug_dent = debugfs_create_dir("dma-api", NULL);
593 if (!dma_debug_dent) {
594 pr_err("DMA-API: can not create debugfs directory\n");
598 global_disable_dent = debugfs_create_bool("disabled", 0444,
600 (u32 *)&global_disable);
601 if (!global_disable_dent)
604 error_count_dent = debugfs_create_u32("error_count", 0444,
605 dma_debug_dent, &error_count);
606 if (!error_count_dent)
609 show_all_errors_dent = debugfs_create_u32("all_errors", 0644,
612 if (!show_all_errors_dent)
615 show_num_errors_dent = debugfs_create_u32("num_errors", 0644,
618 if (!show_num_errors_dent)
621 num_free_entries_dent = debugfs_create_u32("num_free_entries", 0444,
624 if (!num_free_entries_dent)
627 min_free_entries_dent = debugfs_create_u32("min_free_entries", 0444,
630 if (!min_free_entries_dent)
633 filter_dent = debugfs_create_file("driver_filter", 0644,
634 dma_debug_dent, NULL, &filter_fops);
641 debugfs_remove_recursive(dma_debug_dent);
646 static int device_dma_allocations(struct device *dev)
648 struct dma_debug_entry *entry;
652 for (i = 0; i < HASH_SIZE; ++i) {
653 spin_lock_irqsave(&dma_entry_hash[i].lock, flags);
654 list_for_each_entry(entry, &dma_entry_hash[i].list, list) {
655 if (entry->dev == dev)
658 spin_unlock_irqrestore(&dma_entry_hash[i].lock, flags);
664 static int dma_debug_device_change(struct notifier_block *nb,
665 unsigned long action, void *data)
667 struct device *dev = data;
672 case BUS_NOTIFY_UNBOUND_DRIVER:
673 count = device_dma_allocations(dev);
676 err_printk(dev, NULL, "DMA-API: device driver has pending "
677 "DMA allocations while released from device "
678 "[count=%d]\n", count);
687 void dma_debug_add_bus(struct bus_type *bus)
689 struct notifier_block *nb;
691 nb = kzalloc(sizeof(struct notifier_block), GFP_KERNEL);
693 pr_err("dma_debug_add_bus: out of memory\n");
697 nb->notifier_call = dma_debug_device_change;
699 bus_register_notifier(bus, nb);
703 * Let the architectures decide how many entries should be preallocated.
705 void dma_debug_init(u32 num_entries)
712 for (i = 0; i < HASH_SIZE; ++i) {
713 INIT_LIST_HEAD(&dma_entry_hash[i].list);
714 dma_entry_hash[i].lock = SPIN_LOCK_UNLOCKED;
717 if (dma_debug_fs_init() != 0) {
718 pr_err("DMA-API: error creating debugfs entries - disabling\n");
719 global_disable = true;
725 num_entries = req_entries;
727 if (prealloc_memory(num_entries) != 0) {
728 pr_err("DMA-API: debugging out of memory error - disabled\n");
729 global_disable = true;
734 nr_total_entries = num_free_entries;
736 pr_info("DMA-API: debugging enabled by kernel config\n");
739 static __init int dma_debug_cmdline(char *str)
744 if (strncmp(str, "off", 3) == 0) {
745 pr_info("DMA-API: debugging disabled on kernel command line\n");
746 global_disable = true;
752 static __init int dma_debug_entries_cmdline(char *str)
759 res = get_option(&str, &req_entries);
767 __setup("dma_debug=", dma_debug_cmdline);
768 __setup("dma_debug_entries=", dma_debug_entries_cmdline);
770 static void check_unmap(struct dma_debug_entry *ref)
772 struct dma_debug_entry *entry;
773 struct hash_bucket *bucket;
776 if (dma_mapping_error(ref->dev, ref->dev_addr)) {
777 err_printk(ref->dev, NULL, "DMA-API: device driver tries "
778 "to free an invalid DMA memory address\n");
782 bucket = get_hash_bucket(ref, &flags);
783 entry = hash_bucket_find(bucket, ref);
786 err_printk(ref->dev, NULL, "DMA-API: device driver tries "
787 "to free DMA memory it has not allocated "
788 "[device address=0x%016llx] [size=%llu bytes]\n",
789 ref->dev_addr, ref->size);
793 if (ref->size != entry->size) {
794 err_printk(ref->dev, entry, "DMA-API: device driver frees "
795 "DMA memory with different size "
796 "[device address=0x%016llx] [map size=%llu bytes] "
797 "[unmap size=%llu bytes]\n",
798 ref->dev_addr, entry->size, ref->size);
801 if (ref->type != entry->type) {
802 err_printk(ref->dev, entry, "DMA-API: device driver frees "
803 "DMA memory with wrong function "
804 "[device address=0x%016llx] [size=%llu bytes] "
805 "[mapped as %s] [unmapped as %s]\n",
806 ref->dev_addr, ref->size,
807 type2name[entry->type], type2name[ref->type]);
808 } else if ((entry->type == dma_debug_coherent) &&
809 (ref->paddr != entry->paddr)) {
810 err_printk(ref->dev, entry, "DMA-API: device driver frees "
811 "DMA memory with different CPU address "
812 "[device address=0x%016llx] [size=%llu bytes] "
813 "[cpu alloc address=%p] [cpu free address=%p]",
814 ref->dev_addr, ref->size,
815 (void *)entry->paddr, (void *)ref->paddr);
818 if (ref->sg_call_ents && ref->type == dma_debug_sg &&
819 ref->sg_call_ents != entry->sg_call_ents) {
820 err_printk(ref->dev, entry, "DMA-API: device driver frees "
821 "DMA sg list with different entry count "
822 "[map count=%d] [unmap count=%d]\n",
823 entry->sg_call_ents, ref->sg_call_ents);
827 * This may be no bug in reality - but most implementations of the
828 * DMA API don't handle this properly, so check for it here
830 if (ref->direction != entry->direction) {
831 err_printk(ref->dev, entry, "DMA-API: device driver frees "
832 "DMA memory with different direction "
833 "[device address=0x%016llx] [size=%llu bytes] "
834 "[mapped with %s] [unmapped with %s]\n",
835 ref->dev_addr, ref->size,
836 dir2name[entry->direction],
837 dir2name[ref->direction]);
840 hash_bucket_del(entry);
841 dma_entry_free(entry);
844 put_hash_bucket(bucket, &flags);
847 static void check_for_stack(struct device *dev, void *addr)
849 if (object_is_on_stack(addr))
850 err_printk(dev, NULL, "DMA-API: device driver maps memory from"
851 "stack [addr=%p]\n", addr);
854 static inline bool overlap(void *addr, u64 size, void *start, void *end)
856 void *addr2 = (char *)addr + size;
858 return ((addr >= start && addr < end) ||
859 (addr2 >= start && addr2 < end) ||
860 ((addr < start) && (addr2 >= end)));
863 static void check_for_illegal_area(struct device *dev, void *addr, u64 size)
865 if (overlap(addr, size, _text, _etext) ||
866 overlap(addr, size, __start_rodata, __end_rodata))
867 err_printk(dev, NULL, "DMA-API: device driver maps "
868 "memory from kernel text or rodata "
869 "[addr=%p] [size=%llu]\n", addr, size);
872 static void check_sync(struct device *dev, dma_addr_t addr,
873 u64 size, u64 offset, int direction, bool to_cpu)
875 struct dma_debug_entry ref = {
879 .direction = direction,
881 struct dma_debug_entry *entry;
882 struct hash_bucket *bucket;
885 bucket = get_hash_bucket(&ref, &flags);
887 entry = hash_bucket_find(bucket, &ref);
890 err_printk(dev, NULL, "DMA-API: device driver tries "
891 "to sync DMA memory it has not allocated "
892 "[device address=0x%016llx] [size=%llu bytes]\n",
893 (unsigned long long)addr, size);
897 if ((offset + size) > entry->size) {
898 err_printk(dev, entry, "DMA-API: device driver syncs"
899 " DMA memory outside allocated range "
900 "[device address=0x%016llx] "
901 "[allocation size=%llu bytes] [sync offset=%llu] "
902 "[sync size=%llu]\n", entry->dev_addr, entry->size,
906 if (direction != entry->direction) {
907 err_printk(dev, entry, "DMA-API: device driver syncs "
908 "DMA memory with different direction "
909 "[device address=0x%016llx] [size=%llu bytes] "
910 "[mapped with %s] [synced with %s]\n",
911 (unsigned long long)addr, entry->size,
912 dir2name[entry->direction],
913 dir2name[direction]);
916 if (entry->direction == DMA_BIDIRECTIONAL)
919 if (to_cpu && !(entry->direction == DMA_FROM_DEVICE) &&
920 !(direction == DMA_TO_DEVICE))
921 err_printk(dev, entry, "DMA-API: device driver syncs "
922 "device read-only DMA memory for cpu "
923 "[device address=0x%016llx] [size=%llu bytes] "
924 "[mapped with %s] [synced with %s]\n",
925 (unsigned long long)addr, entry->size,
926 dir2name[entry->direction],
927 dir2name[direction]);
929 if (!to_cpu && !(entry->direction == DMA_TO_DEVICE) &&
930 !(direction == DMA_FROM_DEVICE))
931 err_printk(dev, entry, "DMA-API: device driver syncs "
932 "device write-only DMA memory to device "
933 "[device address=0x%016llx] [size=%llu bytes] "
934 "[mapped with %s] [synced with %s]\n",
935 (unsigned long long)addr, entry->size,
936 dir2name[entry->direction],
937 dir2name[direction]);
940 put_hash_bucket(bucket, &flags);
944 void debug_dma_map_page(struct device *dev, struct page *page, size_t offset,
945 size_t size, int direction, dma_addr_t dma_addr,
948 struct dma_debug_entry *entry;
950 if (unlikely(global_disable))
953 if (unlikely(dma_mapping_error(dev, dma_addr)))
956 entry = dma_entry_alloc();
961 entry->type = dma_debug_page;
962 entry->paddr = page_to_phys(page) + offset;
963 entry->dev_addr = dma_addr;
965 entry->direction = direction;
968 entry->type = dma_debug_single;
970 if (!PageHighMem(page)) {
971 void *addr = ((char *)page_address(page)) + offset;
972 check_for_stack(dev, addr);
973 check_for_illegal_area(dev, addr, size);
976 add_dma_entry(entry);
978 EXPORT_SYMBOL(debug_dma_map_page);
980 void debug_dma_unmap_page(struct device *dev, dma_addr_t addr,
981 size_t size, int direction, bool map_single)
983 struct dma_debug_entry ref = {
984 .type = dma_debug_page,
988 .direction = direction,
991 if (unlikely(global_disable))
995 ref.type = dma_debug_single;
999 EXPORT_SYMBOL(debug_dma_unmap_page);
1001 void debug_dma_map_sg(struct device *dev, struct scatterlist *sg,
1002 int nents, int mapped_ents, int direction)
1004 struct dma_debug_entry *entry;
1005 struct scatterlist *s;
1008 if (unlikely(global_disable))
1011 for_each_sg(sg, s, mapped_ents, i) {
1012 entry = dma_entry_alloc();
1016 entry->type = dma_debug_sg;
1018 entry->paddr = sg_phys(s);
1019 entry->size = sg_dma_len(s);
1020 entry->dev_addr = sg_dma_address(s);
1021 entry->direction = direction;
1022 entry->sg_call_ents = nents;
1023 entry->sg_mapped_ents = mapped_ents;
1025 if (!PageHighMem(sg_page(s))) {
1026 check_for_stack(dev, sg_virt(s));
1027 check_for_illegal_area(dev, sg_virt(s), sg_dma_len(s));
1030 add_dma_entry(entry);
1033 EXPORT_SYMBOL(debug_dma_map_sg);
1035 static int get_nr_mapped_entries(struct device *dev, struct scatterlist *s)
1037 struct dma_debug_entry *entry, ref;
1038 struct hash_bucket *bucket;
1039 unsigned long flags;
1043 ref.dev_addr = sg_dma_address(s);
1044 ref.size = sg_dma_len(s),
1046 bucket = get_hash_bucket(&ref, &flags);
1047 entry = hash_bucket_find(bucket, &ref);
1051 mapped_ents = entry->sg_mapped_ents;
1052 put_hash_bucket(bucket, &flags);
1057 void debug_dma_unmap_sg(struct device *dev, struct scatterlist *sglist,
1058 int nelems, int dir)
1060 struct scatterlist *s;
1061 int mapped_ents = 0, i;
1063 if (unlikely(global_disable))
1066 for_each_sg(sglist, s, nelems, i) {
1068 struct dma_debug_entry ref = {
1069 .type = dma_debug_sg,
1071 .paddr = sg_phys(s),
1072 .dev_addr = sg_dma_address(s),
1073 .size = sg_dma_len(s),
1078 if (mapped_ents && i >= mapped_ents)
1082 ref.sg_call_ents = nelems;
1083 mapped_ents = get_nr_mapped_entries(dev, s);
1089 EXPORT_SYMBOL(debug_dma_unmap_sg);
1091 void debug_dma_alloc_coherent(struct device *dev, size_t size,
1092 dma_addr_t dma_addr, void *virt)
1094 struct dma_debug_entry *entry;
1096 if (unlikely(global_disable))
1099 if (unlikely(virt == NULL))
1102 entry = dma_entry_alloc();
1106 entry->type = dma_debug_coherent;
1108 entry->paddr = virt_to_phys(virt);
1110 entry->dev_addr = dma_addr;
1111 entry->direction = DMA_BIDIRECTIONAL;
1113 add_dma_entry(entry);
1115 EXPORT_SYMBOL(debug_dma_alloc_coherent);
1117 void debug_dma_free_coherent(struct device *dev, size_t size,
1118 void *virt, dma_addr_t addr)
1120 struct dma_debug_entry ref = {
1121 .type = dma_debug_coherent,
1123 .paddr = virt_to_phys(virt),
1126 .direction = DMA_BIDIRECTIONAL,
1129 if (unlikely(global_disable))
1134 EXPORT_SYMBOL(debug_dma_free_coherent);
1136 void debug_dma_sync_single_for_cpu(struct device *dev, dma_addr_t dma_handle,
1137 size_t size, int direction)
1139 if (unlikely(global_disable))
1142 check_sync(dev, dma_handle, size, 0, direction, true);
1144 EXPORT_SYMBOL(debug_dma_sync_single_for_cpu);
1146 void debug_dma_sync_single_for_device(struct device *dev,
1147 dma_addr_t dma_handle, size_t size,
1150 if (unlikely(global_disable))
1153 check_sync(dev, dma_handle, size, 0, direction, false);
1155 EXPORT_SYMBOL(debug_dma_sync_single_for_device);
1157 void debug_dma_sync_single_range_for_cpu(struct device *dev,
1158 dma_addr_t dma_handle,
1159 unsigned long offset, size_t size,
1162 if (unlikely(global_disable))
1165 check_sync(dev, dma_handle, size, offset, direction, true);
1167 EXPORT_SYMBOL(debug_dma_sync_single_range_for_cpu);
1169 void debug_dma_sync_single_range_for_device(struct device *dev,
1170 dma_addr_t dma_handle,
1171 unsigned long offset,
1172 size_t size, int direction)
1174 if (unlikely(global_disable))
1177 check_sync(dev, dma_handle, size, offset, direction, false);
1179 EXPORT_SYMBOL(debug_dma_sync_single_range_for_device);
1181 void debug_dma_sync_sg_for_cpu(struct device *dev, struct scatterlist *sg,
1182 int nelems, int direction)
1184 struct scatterlist *s;
1185 int mapped_ents = 0, i;
1187 if (unlikely(global_disable))
1190 for_each_sg(sg, s, nelems, i) {
1192 mapped_ents = get_nr_mapped_entries(dev, s);
1194 if (i >= mapped_ents)
1197 check_sync(dev, sg_dma_address(s), sg_dma_len(s), 0,
1201 EXPORT_SYMBOL(debug_dma_sync_sg_for_cpu);
1203 void debug_dma_sync_sg_for_device(struct device *dev, struct scatterlist *sg,
1204 int nelems, int direction)
1206 struct scatterlist *s;
1207 int mapped_ents = 0, i;
1209 if (unlikely(global_disable))
1212 for_each_sg(sg, s, nelems, i) {
1214 mapped_ents = get_nr_mapped_entries(dev, s);
1216 if (i >= mapped_ents)
1219 check_sync(dev, sg_dma_address(s), sg_dma_len(s), 0,
1223 EXPORT_SYMBOL(debug_dma_sync_sg_for_device);
1225 static int __init dma_debug_driver_setup(char *str)
1229 for (i = 0; i < NAME_MAX_LEN - 1; ++i, ++str) {
1230 current_driver_name[i] = *str;
1235 if (current_driver_name[0])
1236 pr_info("DMA-API: enable driver filter for driver [%s]\n",
1237 current_driver_name);
1242 __setup("dma_debug_driver=", dma_debug_driver_setup);