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
, *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 printk(KERN_ERR
"DMA-API: debugging out of memory "
382 global_disable
= true;
386 entry
= __dma_entry_alloc();
388 #ifdef CONFIG_STACKTRACE
389 entry
->stacktrace
.max_entries
= DMA_DEBUG_STACKTRACE_ENTRIES
;
390 entry
->stacktrace
.entries
= entry
->st_entries
;
391 entry
->stacktrace
.skip
= 2;
392 save_stack_trace(&entry
->stacktrace
);
396 spin_unlock_irqrestore(&free_entries_lock
, flags
);
401 static void dma_entry_free(struct dma_debug_entry
*entry
)
406 * add to beginning of the list - this way the entries are
407 * more likely cache hot when they are reallocated.
409 spin_lock_irqsave(&free_entries_lock
, flags
);
410 list_add(&entry
->list
, &free_entries
);
411 num_free_entries
+= 1;
412 spin_unlock_irqrestore(&free_entries_lock
, flags
);
415 int dma_debug_resize_entries(u32 num_entries
)
417 int i
, delta
, ret
= 0;
419 struct dma_debug_entry
*entry
;
422 spin_lock_irqsave(&free_entries_lock
, flags
);
424 if (nr_total_entries
< num_entries
) {
425 delta
= num_entries
- nr_total_entries
;
427 spin_unlock_irqrestore(&free_entries_lock
, flags
);
429 for (i
= 0; i
< delta
; i
++) {
430 entry
= kzalloc(sizeof(*entry
), GFP_KERNEL
);
434 list_add_tail(&entry
->list
, &tmp
);
437 spin_lock_irqsave(&free_entries_lock
, flags
);
439 list_splice(&tmp
, &free_entries
);
440 nr_total_entries
+= i
;
441 num_free_entries
+= i
;
443 delta
= nr_total_entries
- num_entries
;
445 for (i
= 0; i
< delta
&& !list_empty(&free_entries
); i
++) {
446 entry
= __dma_entry_alloc();
450 nr_total_entries
-= i
;
453 if (nr_total_entries
!= num_entries
)
456 spin_unlock_irqrestore(&free_entries_lock
, flags
);
460 EXPORT_SYMBOL(dma_debug_resize_entries
);
463 * DMA-API debugging init code
465 * The init code does two things:
466 * 1. Initialize core data structures
467 * 2. Preallocate a given number of dma_debug_entry structs
470 static int prealloc_memory(u32 num_entries
)
472 struct dma_debug_entry
*entry
, *next_entry
;
475 for (i
= 0; i
< num_entries
; ++i
) {
476 entry
= kzalloc(sizeof(*entry
), GFP_KERNEL
);
480 list_add_tail(&entry
->list
, &free_entries
);
483 num_free_entries
= num_entries
;
484 min_free_entries
= num_entries
;
486 printk(KERN_INFO
"DMA-API: preallocated %d debug entries\n",
493 list_for_each_entry_safe(entry
, next_entry
, &free_entries
, list
) {
494 list_del(&entry
->list
);
501 static ssize_t
filter_read(struct file
*file
, char __user
*user_buf
,
502 size_t count
, loff_t
*ppos
)
505 char buf
[NAME_MAX_LEN
+ 1];
508 if (!current_driver_name
[0])
512 * We can't copy to userspace directly because current_driver_name can
513 * only be read under the driver_name_lock with irqs disabled. So
514 * create a temporary copy first.
516 read_lock_irqsave(&driver_name_lock
, flags
);
517 len
= scnprintf(buf
, NAME_MAX_LEN
+ 1, "%s\n", current_driver_name
);
518 read_unlock_irqrestore(&driver_name_lock
, flags
);
520 return simple_read_from_buffer(user_buf
, count
, ppos
, buf
, len
);
523 static ssize_t
filter_write(struct file
*file
, const char __user
*userbuf
,
524 size_t count
, loff_t
*ppos
)
527 char buf
[NAME_MAX_LEN
];
528 size_t len
= NAME_MAX_LEN
- 1;
532 * We can't copy from userspace directly. Access to
533 * current_driver_name is protected with a write_lock with irqs
534 * disabled. Since copy_from_user can fault and may sleep we
535 * need to copy to temporary buffer first
537 len
= min(count
, len
);
538 if (copy_from_user(buf
, userbuf
, len
))
543 write_lock_irqsave(&driver_name_lock
, flags
);
545 /* Now handle the string we got from userspace very carefully.
547 * - only use the first token we got
548 * - token delimiter is everything looking like a space
549 * character (' ', '\n', '\t' ...)
552 if (!isalnum(buf
[0])) {
554 If the first character userspace gave us is not
555 * alphanumerical then assume the filter should be
558 if (current_driver_name
[0])
559 printk(KERN_INFO
"DMA-API: switching off dma-debug "
561 current_driver_name
[0] = 0;
562 current_driver
= NULL
;
567 * Now parse out the first token and use it as the name for the
568 * driver to filter for.
570 for (i
= 0; i
< NAME_MAX_LEN
; ++i
) {
571 current_driver_name
[i
] = buf
[i
];
572 if (isspace(buf
[i
]) || buf
[i
] == ' ' || buf
[i
] == 0)
575 current_driver_name
[i
] = 0;
576 current_driver
= NULL
;
578 printk(KERN_INFO
"DMA-API: enable driver filter for driver [%s]\n",
579 current_driver_name
);
582 write_unlock_irqrestore(&driver_name_lock
, flags
);
587 const struct file_operations filter_fops
= {
589 .write
= filter_write
,
592 static int dma_debug_fs_init(void)
594 dma_debug_dent
= debugfs_create_dir("dma-api", NULL
);
595 if (!dma_debug_dent
) {
596 printk(KERN_ERR
"DMA-API: can not create debugfs directory\n");
600 global_disable_dent
= debugfs_create_bool("disabled", 0444,
602 (u32
*)&global_disable
);
603 if (!global_disable_dent
)
606 error_count_dent
= debugfs_create_u32("error_count", 0444,
607 dma_debug_dent
, &error_count
);
608 if (!error_count_dent
)
611 show_all_errors_dent
= debugfs_create_u32("all_errors", 0644,
614 if (!show_all_errors_dent
)
617 show_num_errors_dent
= debugfs_create_u32("num_errors", 0644,
620 if (!show_num_errors_dent
)
623 num_free_entries_dent
= debugfs_create_u32("num_free_entries", 0444,
626 if (!num_free_entries_dent
)
629 min_free_entries_dent
= debugfs_create_u32("min_free_entries", 0444,
632 if (!min_free_entries_dent
)
635 filter_dent
= debugfs_create_file("driver_filter", 0644,
636 dma_debug_dent
, NULL
, &filter_fops
);
643 debugfs_remove_recursive(dma_debug_dent
);
648 static int device_dma_allocations(struct device
*dev
)
650 struct dma_debug_entry
*entry
;
654 for (i
= 0; i
< HASH_SIZE
; ++i
) {
655 spin_lock_irqsave(&dma_entry_hash
[i
].lock
, flags
);
656 list_for_each_entry(entry
, &dma_entry_hash
[i
].list
, list
) {
657 if (entry
->dev
== dev
)
660 spin_unlock_irqrestore(&dma_entry_hash
[i
].lock
, flags
);
666 static int dma_debug_device_change(struct notifier_block
*nb
,
667 unsigned long action
, void *data
)
669 struct device
*dev
= data
;
674 case BUS_NOTIFY_UNBOUND_DRIVER
:
675 count
= device_dma_allocations(dev
);
678 err_printk(dev
, NULL
, "DMA-API: device driver has pending "
679 "DMA allocations while released from device "
680 "[count=%d]\n", count
);
689 void dma_debug_add_bus(struct bus_type
*bus
)
691 struct notifier_block
*nb
;
693 nb
= kzalloc(sizeof(struct notifier_block
), GFP_KERNEL
);
695 printk(KERN_ERR
"dma_debug_add_bus: out of memory\n");
699 nb
->notifier_call
= dma_debug_device_change
;
701 bus_register_notifier(bus
, nb
);
705 * Let the architectures decide how many entries should be preallocated.
707 void dma_debug_init(u32 num_entries
)
714 for (i
= 0; i
< HASH_SIZE
; ++i
) {
715 INIT_LIST_HEAD(&dma_entry_hash
[i
].list
);
716 dma_entry_hash
[i
].lock
= SPIN_LOCK_UNLOCKED
;
719 if (dma_debug_fs_init() != 0) {
720 printk(KERN_ERR
"DMA-API: error creating debugfs entries "
722 global_disable
= true;
728 num_entries
= req_entries
;
730 if (prealloc_memory(num_entries
) != 0) {
731 printk(KERN_ERR
"DMA-API: debugging out of memory error "
733 global_disable
= true;
738 nr_total_entries
= num_free_entries
;
740 printk(KERN_INFO
"DMA-API: debugging enabled by kernel config\n");
743 static __init
int dma_debug_cmdline(char *str
)
748 if (strncmp(str
, "off", 3) == 0) {
749 printk(KERN_INFO
"DMA-API: debugging disabled on kernel "
751 global_disable
= true;
757 static __init
int dma_debug_entries_cmdline(char *str
)
764 res
= get_option(&str
, &req_entries
);
772 __setup("dma_debug=", dma_debug_cmdline
);
773 __setup("dma_debug_entries=", dma_debug_entries_cmdline
);
775 static void check_unmap(struct dma_debug_entry
*ref
)
777 struct dma_debug_entry
*entry
;
778 struct hash_bucket
*bucket
;
781 if (dma_mapping_error(ref
->dev
, ref
->dev_addr
)) {
782 err_printk(ref
->dev
, NULL
, "DMA-API: device driver tries "
783 "to free an invalid DMA memory address\n");
787 bucket
= get_hash_bucket(ref
, &flags
);
788 entry
= hash_bucket_find(bucket
, ref
);
791 err_printk(ref
->dev
, NULL
, "DMA-API: device driver tries "
792 "to free DMA memory it has not allocated "
793 "[device address=0x%016llx] [size=%llu bytes]\n",
794 ref
->dev_addr
, ref
->size
);
798 if (ref
->size
!= entry
->size
) {
799 err_printk(ref
->dev
, entry
, "DMA-API: device driver frees "
800 "DMA memory with different size "
801 "[device address=0x%016llx] [map size=%llu bytes] "
802 "[unmap size=%llu bytes]\n",
803 ref
->dev_addr
, entry
->size
, ref
->size
);
806 if (ref
->type
!= entry
->type
) {
807 err_printk(ref
->dev
, entry
, "DMA-API: device driver frees "
808 "DMA memory with wrong function "
809 "[device address=0x%016llx] [size=%llu bytes] "
810 "[mapped as %s] [unmapped as %s]\n",
811 ref
->dev_addr
, ref
->size
,
812 type2name
[entry
->type
], type2name
[ref
->type
]);
813 } else if ((entry
->type
== dma_debug_coherent
) &&
814 (ref
->paddr
!= entry
->paddr
)) {
815 err_printk(ref
->dev
, entry
, "DMA-API: device driver frees "
816 "DMA memory with different CPU address "
817 "[device address=0x%016llx] [size=%llu bytes] "
818 "[cpu alloc address=%p] [cpu free address=%p]",
819 ref
->dev_addr
, ref
->size
,
820 (void *)entry
->paddr
, (void *)ref
->paddr
);
823 if (ref
->sg_call_ents
&& ref
->type
== dma_debug_sg
&&
824 ref
->sg_call_ents
!= entry
->sg_call_ents
) {
825 err_printk(ref
->dev
, entry
, "DMA-API: device driver frees "
826 "DMA sg list with different entry count "
827 "[map count=%d] [unmap count=%d]\n",
828 entry
->sg_call_ents
, ref
->sg_call_ents
);
832 * This may be no bug in reality - but most implementations of the
833 * DMA API don't handle this properly, so check for it here
835 if (ref
->direction
!= entry
->direction
) {
836 err_printk(ref
->dev
, entry
, "DMA-API: device driver frees "
837 "DMA memory with different direction "
838 "[device address=0x%016llx] [size=%llu bytes] "
839 "[mapped with %s] [unmapped with %s]\n",
840 ref
->dev_addr
, ref
->size
,
841 dir2name
[entry
->direction
],
842 dir2name
[ref
->direction
]);
845 hash_bucket_del(entry
);
846 dma_entry_free(entry
);
849 put_hash_bucket(bucket
, &flags
);
852 static void check_for_stack(struct device
*dev
, void *addr
)
854 if (object_is_on_stack(addr
))
855 err_printk(dev
, NULL
, "DMA-API: device driver maps memory from"
856 "stack [addr=%p]\n", addr
);
859 static inline bool overlap(void *addr
, u64 size
, void *start
, void *end
)
861 void *addr2
= (char *)addr
+ size
;
863 return ((addr
>= start
&& addr
< end
) ||
864 (addr2
>= start
&& addr2
< end
) ||
865 ((addr
< start
) && (addr2
>= end
)));
868 static void check_for_illegal_area(struct device
*dev
, void *addr
, u64 size
)
870 if (overlap(addr
, size
, _text
, _etext
) ||
871 overlap(addr
, size
, __start_rodata
, __end_rodata
))
872 err_printk(dev
, NULL
, "DMA-API: device driver maps "
873 "memory from kernel text or rodata "
874 "[addr=%p] [size=%llu]\n", addr
, size
);
877 static void check_sync(struct device
*dev
, dma_addr_t addr
,
878 u64 size
, u64 offset
, int direction
, bool to_cpu
)
880 struct dma_debug_entry ref
= {
884 .direction
= direction
,
886 struct dma_debug_entry
*entry
;
887 struct hash_bucket
*bucket
;
890 bucket
= get_hash_bucket(&ref
, &flags
);
892 entry
= hash_bucket_find(bucket
, &ref
);
895 err_printk(dev
, NULL
, "DMA-API: device driver tries "
896 "to sync DMA memory it has not allocated "
897 "[device address=0x%016llx] [size=%llu bytes]\n",
898 (unsigned long long)addr
, size
);
902 if ((offset
+ size
) > entry
->size
) {
903 err_printk(dev
, entry
, "DMA-API: device driver syncs"
904 " DMA memory outside allocated range "
905 "[device address=0x%016llx] "
906 "[allocation size=%llu bytes] [sync offset=%llu] "
907 "[sync size=%llu]\n", entry
->dev_addr
, entry
->size
,
911 if (direction
!= entry
->direction
) {
912 err_printk(dev
, entry
, "DMA-API: device driver syncs "
913 "DMA memory with different direction "
914 "[device address=0x%016llx] [size=%llu bytes] "
915 "[mapped with %s] [synced with %s]\n",
916 (unsigned long long)addr
, entry
->size
,
917 dir2name
[entry
->direction
],
918 dir2name
[direction
]);
921 if (entry
->direction
== DMA_BIDIRECTIONAL
)
924 if (to_cpu
&& !(entry
->direction
== DMA_FROM_DEVICE
) &&
925 !(direction
== DMA_TO_DEVICE
))
926 err_printk(dev
, entry
, "DMA-API: device driver syncs "
927 "device read-only DMA memory for cpu "
928 "[device address=0x%016llx] [size=%llu bytes] "
929 "[mapped with %s] [synced with %s]\n",
930 (unsigned long long)addr
, entry
->size
,
931 dir2name
[entry
->direction
],
932 dir2name
[direction
]);
934 if (!to_cpu
&& !(entry
->direction
== DMA_TO_DEVICE
) &&
935 !(direction
== DMA_FROM_DEVICE
))
936 err_printk(dev
, entry
, "DMA-API: device driver syncs "
937 "device write-only DMA memory to device "
938 "[device address=0x%016llx] [size=%llu bytes] "
939 "[mapped with %s] [synced with %s]\n",
940 (unsigned long long)addr
, entry
->size
,
941 dir2name
[entry
->direction
],
942 dir2name
[direction
]);
945 put_hash_bucket(bucket
, &flags
);
949 void debug_dma_map_page(struct device
*dev
, struct page
*page
, size_t offset
,
950 size_t size
, int direction
, dma_addr_t dma_addr
,
953 struct dma_debug_entry
*entry
;
955 if (unlikely(global_disable
))
958 if (unlikely(dma_mapping_error(dev
, dma_addr
)))
961 entry
= dma_entry_alloc();
966 entry
->type
= dma_debug_page
;
967 entry
->paddr
= page_to_phys(page
) + offset
;
968 entry
->dev_addr
= dma_addr
;
970 entry
->direction
= direction
;
973 entry
->type
= dma_debug_single
;
975 if (!PageHighMem(page
)) {
976 void *addr
= ((char *)page_address(page
)) + offset
;
977 check_for_stack(dev
, addr
);
978 check_for_illegal_area(dev
, addr
, size
);
981 add_dma_entry(entry
);
983 EXPORT_SYMBOL(debug_dma_map_page
);
985 void debug_dma_unmap_page(struct device
*dev
, dma_addr_t addr
,
986 size_t size
, int direction
, bool map_single
)
988 struct dma_debug_entry ref
= {
989 .type
= dma_debug_page
,
993 .direction
= direction
,
996 if (unlikely(global_disable
))
1000 ref
.type
= dma_debug_single
;
1004 EXPORT_SYMBOL(debug_dma_unmap_page
);
1006 void debug_dma_map_sg(struct device
*dev
, struct scatterlist
*sg
,
1007 int nents
, int mapped_ents
, int direction
)
1009 struct dma_debug_entry
*entry
;
1010 struct scatterlist
*s
;
1013 if (unlikely(global_disable
))
1016 for_each_sg(sg
, s
, mapped_ents
, i
) {
1017 entry
= dma_entry_alloc();
1021 entry
->type
= dma_debug_sg
;
1023 entry
->paddr
= sg_phys(s
);
1024 entry
->size
= sg_dma_len(s
);
1025 entry
->dev_addr
= sg_dma_address(s
);
1026 entry
->direction
= direction
;
1027 entry
->sg_call_ents
= nents
;
1028 entry
->sg_mapped_ents
= mapped_ents
;
1030 if (!PageHighMem(sg_page(s
))) {
1031 check_for_stack(dev
, sg_virt(s
));
1032 check_for_illegal_area(dev
, sg_virt(s
), sg_dma_len(s
));
1035 add_dma_entry(entry
);
1038 EXPORT_SYMBOL(debug_dma_map_sg
);
1040 static int get_nr_mapped_entries(struct device
*dev
, struct scatterlist
*s
)
1042 struct dma_debug_entry
*entry
;
1043 struct hash_bucket
*bucket
;
1044 unsigned long flags
;
1045 int mapped_ents
= 0;
1046 struct dma_debug_entry ref
;
1049 ref
.dev_addr
= sg_dma_address(s
);
1050 ref
.size
= sg_dma_len(s
),
1052 bucket
= get_hash_bucket(&ref
, &flags
);
1053 entry
= hash_bucket_find(bucket
, &ref
);
1055 mapped_ents
= entry
->sg_mapped_ents
;
1056 put_hash_bucket(bucket
, &flags
);
1061 void debug_dma_unmap_sg(struct device
*dev
, struct scatterlist
*sglist
,
1062 int nelems
, int dir
)
1064 struct scatterlist
*s
;
1065 int mapped_ents
= 0, i
;
1067 if (unlikely(global_disable
))
1070 for_each_sg(sglist
, s
, nelems
, i
) {
1072 struct dma_debug_entry ref
= {
1073 .type
= dma_debug_sg
,
1075 .paddr
= sg_phys(s
),
1076 .dev_addr
= sg_dma_address(s
),
1077 .size
= sg_dma_len(s
),
1082 if (mapped_ents
&& i
>= mapped_ents
)
1086 ref
.sg_call_ents
= nelems
;
1087 mapped_ents
= get_nr_mapped_entries(dev
, s
);
1093 EXPORT_SYMBOL(debug_dma_unmap_sg
);
1095 void debug_dma_alloc_coherent(struct device
*dev
, size_t size
,
1096 dma_addr_t dma_addr
, void *virt
)
1098 struct dma_debug_entry
*entry
;
1100 if (unlikely(global_disable
))
1103 if (unlikely(virt
== NULL
))
1106 entry
= dma_entry_alloc();
1110 entry
->type
= dma_debug_coherent
;
1112 entry
->paddr
= virt_to_phys(virt
);
1114 entry
->dev_addr
= dma_addr
;
1115 entry
->direction
= DMA_BIDIRECTIONAL
;
1117 add_dma_entry(entry
);
1119 EXPORT_SYMBOL(debug_dma_alloc_coherent
);
1121 void debug_dma_free_coherent(struct device
*dev
, size_t size
,
1122 void *virt
, dma_addr_t addr
)
1124 struct dma_debug_entry ref
= {
1125 .type
= dma_debug_coherent
,
1127 .paddr
= virt_to_phys(virt
),
1130 .direction
= DMA_BIDIRECTIONAL
,
1133 if (unlikely(global_disable
))
1138 EXPORT_SYMBOL(debug_dma_free_coherent
);
1140 void debug_dma_sync_single_for_cpu(struct device
*dev
, dma_addr_t dma_handle
,
1141 size_t size
, int direction
)
1143 if (unlikely(global_disable
))
1146 check_sync(dev
, dma_handle
, size
, 0, direction
, true);
1148 EXPORT_SYMBOL(debug_dma_sync_single_for_cpu
);
1150 void debug_dma_sync_single_for_device(struct device
*dev
,
1151 dma_addr_t dma_handle
, size_t size
,
1154 if (unlikely(global_disable
))
1157 check_sync(dev
, dma_handle
, size
, 0, direction
, false);
1159 EXPORT_SYMBOL(debug_dma_sync_single_for_device
);
1161 void debug_dma_sync_single_range_for_cpu(struct device
*dev
,
1162 dma_addr_t dma_handle
,
1163 unsigned long offset
, size_t size
,
1166 if (unlikely(global_disable
))
1169 check_sync(dev
, dma_handle
, size
, offset
, direction
, true);
1171 EXPORT_SYMBOL(debug_dma_sync_single_range_for_cpu
);
1173 void debug_dma_sync_single_range_for_device(struct device
*dev
,
1174 dma_addr_t dma_handle
,
1175 unsigned long offset
,
1176 size_t size
, int direction
)
1178 if (unlikely(global_disable
))
1181 check_sync(dev
, dma_handle
, size
, offset
, direction
, false);
1183 EXPORT_SYMBOL(debug_dma_sync_single_range_for_device
);
1185 void debug_dma_sync_sg_for_cpu(struct device
*dev
, struct scatterlist
*sg
,
1186 int nelems
, int direction
)
1188 struct scatterlist
*s
;
1189 int mapped_ents
= 0, i
;
1191 if (unlikely(global_disable
))
1194 for_each_sg(sg
, s
, nelems
, i
) {
1196 mapped_ents
= get_nr_mapped_entries(dev
, s
);
1198 if (i
>= mapped_ents
)
1201 check_sync(dev
, sg_dma_address(s
), sg_dma_len(s
), 0,
1205 EXPORT_SYMBOL(debug_dma_sync_sg_for_cpu
);
1207 void debug_dma_sync_sg_for_device(struct device
*dev
, struct scatterlist
*sg
,
1208 int nelems
, int direction
)
1210 struct scatterlist
*s
;
1211 int mapped_ents
= 0, i
;
1213 if (unlikely(global_disable
))
1216 for_each_sg(sg
, s
, nelems
, i
) {
1218 mapped_ents
= get_nr_mapped_entries(dev
, s
);
1220 if (i
>= mapped_ents
)
1223 check_sync(dev
, sg_dma_address(s
), sg_dma_len(s
), 0,
1227 EXPORT_SYMBOL(debug_dma_sync_sg_for_device
);
1229 static int __init
dma_debug_driver_setup(char *str
)
1233 for (i
= 0; i
< NAME_MAX_LEN
- 1; ++i
, ++str
) {
1234 current_driver_name
[i
] = *str
;
1239 if (current_driver_name
[0])
1240 printk(KERN_INFO
"DMA-API: enable driver filter for "
1241 "driver [%s]\n", current_driver_name
);
1246 __setup("dma_debug_driver=", dma_debug_driver_setup
);