blob: 13ef2338be4150d1345a80a510d67f410a7c2c73 [file] [log] [blame]
Joerg Roedelf2f45e52009-01-09 12:19:52 +01001/*
2 * Copyright (C) 2008 Advanced Micro Devices, Inc.
3 *
4 * Author: Joerg Roedel <joerg.roedel@amd.com>
5 *
6 * This program is free software; you can redistribute it and/or modify it
7 * under the terms of the GNU General Public License version 2 as published
8 * by the Free Software Foundation.
9 *
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
14 *
15 * You should have received a copy of the GNU General Public License
16 * along with this program; if not, write to the Free Software
17 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
18 */
19
Joerg Roedel972aa452009-01-09 14:19:54 +010020#include <linux/scatterlist.h>
Joerg Roedel2d62ece2009-01-09 14:10:26 +010021#include <linux/dma-mapping.h>
David Woodhouse6c132d12009-01-19 16:52:39 +010022#include <linux/stacktrace.h>
Joerg Roedelf2f45e52009-01-09 12:19:52 +010023#include <linux/dma-debug.h>
Joerg Roedel30dfa902009-01-09 12:34:49 +010024#include <linux/spinlock.h>
Joerg Roedel788dcfa2009-01-09 13:13:27 +010025#include <linux/debugfs.h>
Joerg Roedel8a6fc702009-05-22 21:23:13 +020026#include <linux/uaccess.h>
Paul Gortmaker23a7bfa2011-07-01 16:23:59 -040027#include <linux/export.h>
Joerg Roedel2d62ece2009-01-09 14:10:26 +010028#include <linux/device.h>
Joerg Roedelf2f45e52009-01-09 12:19:52 +010029#include <linux/types.h>
Joerg Roedel2d62ece2009-01-09 14:10:26 +010030#include <linux/sched.h>
Joerg Roedel8a6fc702009-05-22 21:23:13 +020031#include <linux/ctype.h>
Joerg Roedelf2f45e52009-01-09 12:19:52 +010032#include <linux/list.h>
Joerg Roedel6bf07872009-01-09 12:54:42 +010033#include <linux/slab.h>
Joerg Roedelf2f45e52009-01-09 12:19:52 +010034
Joerg Roedel2e34bde2009-03-16 16:51:55 +010035#include <asm/sections.h>
36
Joerg Roedel30dfa902009-01-09 12:34:49 +010037#define HASH_SIZE 1024ULL
38#define HASH_FN_SHIFT 13
39#define HASH_FN_MASK (HASH_SIZE - 1)
40
Joerg Roedelf2f45e52009-01-09 12:19:52 +010041enum {
42 dma_debug_single,
43 dma_debug_page,
44 dma_debug_sg,
45 dma_debug_coherent,
46};
47
David Woodhouse6c132d12009-01-19 16:52:39 +010048#define DMA_DEBUG_STACKTRACE_ENTRIES 5
49
Joerg Roedelf2f45e52009-01-09 12:19:52 +010050struct dma_debug_entry {
51 struct list_head list;
52 struct device *dev;
53 int type;
54 phys_addr_t paddr;
55 u64 dev_addr;
56 u64 size;
57 int direction;
58 int sg_call_ents;
59 int sg_mapped_ents;
David Woodhouse6c132d12009-01-19 16:52:39 +010060#ifdef CONFIG_STACKTRACE
61 struct stack_trace stacktrace;
62 unsigned long st_entries[DMA_DEBUG_STACKTRACE_ENTRIES];
63#endif
Joerg Roedelf2f45e52009-01-09 12:19:52 +010064};
65
Neil Hormanc6a21d02011-08-08 15:13:54 -040066typedef bool (*match_fn)(struct dma_debug_entry *, struct dma_debug_entry *);
67
Joerg Roedel30dfa902009-01-09 12:34:49 +010068struct hash_bucket {
69 struct list_head list;
70 spinlock_t lock;
Joerg Roedel2d62ece2009-01-09 14:10:26 +010071} ____cacheline_aligned_in_smp;
Joerg Roedel30dfa902009-01-09 12:34:49 +010072
73/* Hash list to save the allocated dma addresses */
74static struct hash_bucket dma_entry_hash[HASH_SIZE];
Joerg Roedel3b1e79e2009-01-09 12:42:46 +010075/* List of pre-allocated dma_debug_entry's */
76static LIST_HEAD(free_entries);
77/* Lock for the list above */
78static DEFINE_SPINLOCK(free_entries_lock);
79
80/* Global disable flag - will be set in case of an error */
81static bool global_disable __read_mostly;
82
Joerg Roedel788dcfa2009-01-09 13:13:27 +010083/* Global error count */
84static u32 error_count;
85
86/* Global error show enable*/
87static u32 show_all_errors __read_mostly;
88/* Number of errors to show */
89static u32 show_num_errors = 1;
90
Joerg Roedel3b1e79e2009-01-09 12:42:46 +010091static u32 num_free_entries;
92static u32 min_free_entries;
FUJITA Tomonorie6a1a892009-04-15 18:22:41 +090093static u32 nr_total_entries;
Joerg Roedel30dfa902009-01-09 12:34:49 +010094
Joerg Roedel59d3daa2009-01-09 13:01:56 +010095/* number of preallocated entries requested by kernel cmdline */
96static u32 req_entries;
97
Joerg Roedel788dcfa2009-01-09 13:13:27 +010098/* debugfs dentry's for the stuff above */
99static struct dentry *dma_debug_dent __read_mostly;
100static struct dentry *global_disable_dent __read_mostly;
101static struct dentry *error_count_dent __read_mostly;
102static struct dentry *show_all_errors_dent __read_mostly;
103static struct dentry *show_num_errors_dent __read_mostly;
104static struct dentry *num_free_entries_dent __read_mostly;
105static struct dentry *min_free_entries_dent __read_mostly;
Joerg Roedel8a6fc702009-05-22 21:23:13 +0200106static struct dentry *filter_dent __read_mostly;
Joerg Roedel788dcfa2009-01-09 13:13:27 +0100107
Joerg Roedel2e507d82009-05-22 18:24:20 +0200108/* per-driver filter related state */
109
110#define NAME_MAX_LEN 64
111
112static char current_driver_name[NAME_MAX_LEN] __read_mostly;
113static struct device_driver *current_driver __read_mostly;
114
115static DEFINE_RWLOCK(driver_name_lock);
Joerg Roedel30dfa902009-01-09 12:34:49 +0100116
Joerg Roedel2d62ece2009-01-09 14:10:26 +0100117static const char *type2name[4] = { "single", "page",
118 "scather-gather", "coherent" };
119
120static const char *dir2name[4] = { "DMA_BIDIRECTIONAL", "DMA_TO_DEVICE",
121 "DMA_FROM_DEVICE", "DMA_NONE" };
122
Joerg Roedeled888ae2009-05-22 17:16:04 +0200123/* little merge helper - remove it after the merge window */
124#ifndef BUS_NOTIFY_UNBOUND_DRIVER
125#define BUS_NOTIFY_UNBOUND_DRIVER 0x0005
126#endif
127
Joerg Roedel2d62ece2009-01-09 14:10:26 +0100128/*
129 * The access to some variables in this macro is racy. We can't use atomic_t
130 * here because all these variables are exported to debugfs. Some of them even
131 * writeable. This is also the reason why a lock won't help much. But anyway,
132 * the races are no big deal. Here is why:
133 *
134 * error_count: the addition is racy, but the worst thing that can happen is
135 * that we don't count some errors
136 * show_num_errors: the subtraction is racy. Also no big deal because in
137 * worst case this will result in one warning more in the
138 * system log than the user configured. This variable is
139 * writeable via debugfs.
140 */
David Woodhouse6c132d12009-01-19 16:52:39 +0100141static inline void dump_entry_trace(struct dma_debug_entry *entry)
142{
143#ifdef CONFIG_STACKTRACE
144 if (entry) {
Joerg Roedele7ed70e2009-06-08 15:39:24 +0200145 pr_warning("Mapped at:\n");
David Woodhouse6c132d12009-01-19 16:52:39 +0100146 print_stack_trace(&entry->stacktrace, 0);
147 }
148#endif
149}
150
Joerg Roedel2e507d82009-05-22 18:24:20 +0200151static bool driver_filter(struct device *dev)
152{
Joerg Roedel0bf84122009-06-08 15:53:46 +0200153 struct device_driver *drv;
154 unsigned long flags;
155 bool ret;
156
Joerg Roedel2e507d82009-05-22 18:24:20 +0200157 /* driver filter off */
158 if (likely(!current_driver_name[0]))
159 return true;
160
161 /* driver filter on and initialized */
Kyle McMartinec9c96e2009-08-19 21:17:08 -0400162 if (current_driver && dev && dev->driver == current_driver)
Joerg Roedel2e507d82009-05-22 18:24:20 +0200163 return true;
164
Kyle McMartinec9c96e2009-08-19 21:17:08 -0400165 /* driver filter on, but we can't filter on a NULL device... */
166 if (!dev)
167 return false;
168
Joerg Roedel0bf84122009-06-08 15:53:46 +0200169 if (current_driver || !current_driver_name[0])
170 return false;
171
Joerg Roedel2e507d82009-05-22 18:24:20 +0200172 /* driver filter on but not yet initialized */
Alan Sternf3ff9242012-01-24 13:35:24 -0500173 drv = dev->driver;
Joerg Roedel0bf84122009-06-08 15:53:46 +0200174 if (!drv)
175 return false;
Joerg Roedel2e507d82009-05-22 18:24:20 +0200176
Joerg Roedel0bf84122009-06-08 15:53:46 +0200177 /* lock to protect against change of current_driver_name */
178 read_lock_irqsave(&driver_name_lock, flags);
Joerg Roedel2e507d82009-05-22 18:24:20 +0200179
Joerg Roedel0bf84122009-06-08 15:53:46 +0200180 ret = false;
181 if (drv->name &&
182 strncmp(current_driver_name, drv->name, NAME_MAX_LEN - 1) == 0) {
183 current_driver = drv;
184 ret = true;
Joerg Roedel2e507d82009-05-22 18:24:20 +0200185 }
186
Joerg Roedel0bf84122009-06-08 15:53:46 +0200187 read_unlock_irqrestore(&driver_name_lock, flags);
Joerg Roedel0bf84122009-06-08 15:53:46 +0200188
189 return ret;
Joerg Roedel2e507d82009-05-22 18:24:20 +0200190}
191
Kyle McMartinec9c96e2009-08-19 21:17:08 -0400192#define err_printk(dev, entry, format, arg...) do { \
193 error_count += 1; \
194 if (driver_filter(dev) && \
195 (show_all_errors || show_num_errors > 0)) { \
196 WARN(1, "%s %s: " format, \
197 dev ? dev_driver_string(dev) : "NULL", \
198 dev ? dev_name(dev) : "NULL", ## arg); \
199 dump_entry_trace(entry); \
200 } \
201 if (!show_all_errors && show_num_errors > 0) \
202 show_num_errors -= 1; \
Joerg Roedel2d62ece2009-01-09 14:10:26 +0100203 } while (0);
204
Joerg Roedel30dfa902009-01-09 12:34:49 +0100205/*
206 * Hash related functions
207 *
208 * Every DMA-API request is saved into a struct dma_debug_entry. To
209 * have quick access to these structs they are stored into a hash.
210 */
211static int hash_fn(struct dma_debug_entry *entry)
212{
213 /*
214 * Hash function is based on the dma address.
215 * We use bits 20-27 here as the index into the hash
216 */
217 return (entry->dev_addr >> HASH_FN_SHIFT) & HASH_FN_MASK;
218}
219
220/*
221 * Request exclusive access to a hash bucket for a given dma_debug_entry.
222 */
223static struct hash_bucket *get_hash_bucket(struct dma_debug_entry *entry,
224 unsigned long *flags)
225{
226 int idx = hash_fn(entry);
227 unsigned long __flags;
228
229 spin_lock_irqsave(&dma_entry_hash[idx].lock, __flags);
230 *flags = __flags;
231 return &dma_entry_hash[idx];
232}
233
234/*
235 * Give up exclusive access to the hash bucket
236 */
237static void put_hash_bucket(struct hash_bucket *bucket,
238 unsigned long *flags)
239{
240 unsigned long __flags = *flags;
241
242 spin_unlock_irqrestore(&bucket->lock, __flags);
243}
244
Neil Hormanc6a21d02011-08-08 15:13:54 -0400245static bool exact_match(struct dma_debug_entry *a, struct dma_debug_entry *b)
246{
Thomas Jarosch91ec37c2011-11-17 20:31:02 +0100247 return ((a->dev_addr == b->dev_addr) &&
Neil Hormanc6a21d02011-08-08 15:13:54 -0400248 (a->dev == b->dev)) ? true : false;
249}
250
251static bool containing_match(struct dma_debug_entry *a,
252 struct dma_debug_entry *b)
253{
254 if (a->dev != b->dev)
255 return false;
256
257 if ((b->dev_addr <= a->dev_addr) &&
258 ((b->dev_addr + b->size) >= (a->dev_addr + a->size)))
259 return true;
260
261 return false;
262}
263
Joerg Roedel30dfa902009-01-09 12:34:49 +0100264/*
265 * Search a given entry in the hash bucket list
266 */
Neil Hormanc6a21d02011-08-08 15:13:54 -0400267static struct dma_debug_entry *__hash_bucket_find(struct hash_bucket *bucket,
268 struct dma_debug_entry *ref,
269 match_fn match)
Joerg Roedel30dfa902009-01-09 12:34:49 +0100270{
Joerg Roedel7caf6a42009-06-05 12:01:35 +0200271 struct dma_debug_entry *entry, *ret = NULL;
272 int matches = 0, match_lvl, last_lvl = 0;
Joerg Roedel30dfa902009-01-09 12:34:49 +0100273
274 list_for_each_entry(entry, &bucket->list, list) {
Neil Hormanc6a21d02011-08-08 15:13:54 -0400275 if (!match(ref, entry))
Joerg Roedel7caf6a42009-06-05 12:01:35 +0200276 continue;
277
278 /*
279 * Some drivers map the same physical address multiple
280 * times. Without a hardware IOMMU this results in the
281 * same device addresses being put into the dma-debug
282 * hash multiple times too. This can result in false
André Goddard Rosaaf901ca2009-11-14 13:09:05 -0200283 * positives being reported. Therefore we implement a
Joerg Roedel7caf6a42009-06-05 12:01:35 +0200284 * best-fit algorithm here which returns the entry from
285 * the hash which fits best to the reference value
286 * instead of the first-fit.
287 */
288 matches += 1;
289 match_lvl = 0;
Joerg Roedele5e8c5b2009-06-11 10:03:42 +0200290 entry->size == ref->size ? ++match_lvl : 0;
291 entry->type == ref->type ? ++match_lvl : 0;
292 entry->direction == ref->direction ? ++match_lvl : 0;
293 entry->sg_call_ents == ref->sg_call_ents ? ++match_lvl : 0;
Joerg Roedel7caf6a42009-06-05 12:01:35 +0200294
Joerg Roedele5e8c5b2009-06-11 10:03:42 +0200295 if (match_lvl == 4) {
Joerg Roedel7caf6a42009-06-05 12:01:35 +0200296 /* perfect-fit - return the result */
Joerg Roedel30dfa902009-01-09 12:34:49 +0100297 return entry;
Joerg Roedel7caf6a42009-06-05 12:01:35 +0200298 } else if (match_lvl > last_lvl) {
299 /*
300 * We found an entry that fits better then the
301 * previous one
302 */
303 last_lvl = match_lvl;
304 ret = entry;
305 }
Joerg Roedel30dfa902009-01-09 12:34:49 +0100306 }
307
Joerg Roedel7caf6a42009-06-05 12:01:35 +0200308 /*
309 * If we have multiple matches but no perfect-fit, just return
310 * NULL.
311 */
312 ret = (matches == 1) ? ret : NULL;
313
314 return ret;
Joerg Roedel30dfa902009-01-09 12:34:49 +0100315}
316
Neil Hormanc6a21d02011-08-08 15:13:54 -0400317static struct dma_debug_entry *bucket_find_exact(struct hash_bucket *bucket,
318 struct dma_debug_entry *ref)
319{
320 return __hash_bucket_find(bucket, ref, exact_match);
321}
322
323static struct dma_debug_entry *bucket_find_contain(struct hash_bucket **bucket,
324 struct dma_debug_entry *ref,
325 unsigned long *flags)
326{
327
328 unsigned int max_range = dma_get_max_seg_size(ref->dev);
329 struct dma_debug_entry *entry, index = *ref;
330 unsigned int range = 0;
331
332 while (range <= max_range) {
333 entry = __hash_bucket_find(*bucket, &index, containing_match);
334
335 if (entry)
336 return entry;
337
338 /*
339 * Nothing found, go back a hash bucket
340 */
341 put_hash_bucket(*bucket, flags);
342 range += (1 << HASH_FN_SHIFT);
343 index.dev_addr -= (1 << HASH_FN_SHIFT);
344 *bucket = get_hash_bucket(&index, flags);
345 }
346
347 return NULL;
348}
349
Joerg Roedel30dfa902009-01-09 12:34:49 +0100350/*
351 * Add an entry to a hash bucket
352 */
353static void hash_bucket_add(struct hash_bucket *bucket,
354 struct dma_debug_entry *entry)
355{
356 list_add_tail(&entry->list, &bucket->list);
357}
358
359/*
360 * Remove entry from a hash bucket list
361 */
362static void hash_bucket_del(struct dma_debug_entry *entry)
363{
364 list_del(&entry->list);
365}
366
367/*
David Woodhouseac26c182009-02-12 16:19:13 +0100368 * Dump mapping entries for debugging purposes
369 */
370void debug_dma_dump_mappings(struct device *dev)
371{
372 int idx;
373
374 for (idx = 0; idx < HASH_SIZE; idx++) {
375 struct hash_bucket *bucket = &dma_entry_hash[idx];
376 struct dma_debug_entry *entry;
377 unsigned long flags;
378
379 spin_lock_irqsave(&bucket->lock, flags);
380
381 list_for_each_entry(entry, &bucket->list, list) {
382 if (!dev || dev == entry->dev) {
383 dev_info(entry->dev,
384 "%s idx %d P=%Lx D=%Lx L=%Lx %s\n",
385 type2name[entry->type], idx,
386 (unsigned long long)entry->paddr,
387 entry->dev_addr, entry->size,
388 dir2name[entry->direction]);
389 }
390 }
391
392 spin_unlock_irqrestore(&bucket->lock, flags);
393 }
394}
395EXPORT_SYMBOL(debug_dma_dump_mappings);
396
397/*
Joerg Roedel30dfa902009-01-09 12:34:49 +0100398 * Wrapper function for adding an entry to the hash.
399 * This function takes care of locking itself.
400 */
401static void add_dma_entry(struct dma_debug_entry *entry)
402{
403 struct hash_bucket *bucket;
404 unsigned long flags;
405
406 bucket = get_hash_bucket(entry, &flags);
407 hash_bucket_add(bucket, entry);
408 put_hash_bucket(bucket, &flags);
409}
410
FUJITA Tomonorie6a1a892009-04-15 18:22:41 +0900411static struct dma_debug_entry *__dma_entry_alloc(void)
412{
413 struct dma_debug_entry *entry;
414
415 entry = list_entry(free_entries.next, struct dma_debug_entry, list);
416 list_del(&entry->list);
417 memset(entry, 0, sizeof(*entry));
418
419 num_free_entries -= 1;
420 if (num_free_entries < min_free_entries)
421 min_free_entries = num_free_entries;
422
423 return entry;
424}
425
Joerg Roedel3b1e79e2009-01-09 12:42:46 +0100426/* struct dma_entry allocator
427 *
428 * The next two functions implement the allocator for
429 * struct dma_debug_entries.
430 */
431static struct dma_debug_entry *dma_entry_alloc(void)
432{
433 struct dma_debug_entry *entry = NULL;
434 unsigned long flags;
435
436 spin_lock_irqsave(&free_entries_lock, flags);
437
438 if (list_empty(&free_entries)) {
Joerg Roedele7ed70e2009-06-08 15:39:24 +0200439 pr_err("DMA-API: debugging out of memory - disabling\n");
Joerg Roedel3b1e79e2009-01-09 12:42:46 +0100440 global_disable = true;
441 goto out;
442 }
443
FUJITA Tomonorie6a1a892009-04-15 18:22:41 +0900444 entry = __dma_entry_alloc();
Joerg Roedel3b1e79e2009-01-09 12:42:46 +0100445
David Woodhouse6c132d12009-01-19 16:52:39 +0100446#ifdef CONFIG_STACKTRACE
447 entry->stacktrace.max_entries = DMA_DEBUG_STACKTRACE_ENTRIES;
448 entry->stacktrace.entries = entry->st_entries;
449 entry->stacktrace.skip = 2;
450 save_stack_trace(&entry->stacktrace);
451#endif
Joerg Roedel3b1e79e2009-01-09 12:42:46 +0100452
453out:
454 spin_unlock_irqrestore(&free_entries_lock, flags);
455
456 return entry;
457}
458
459static void dma_entry_free(struct dma_debug_entry *entry)
460{
461 unsigned long flags;
462
463 /*
464 * add to beginning of the list - this way the entries are
465 * more likely cache hot when they are reallocated.
466 */
467 spin_lock_irqsave(&free_entries_lock, flags);
468 list_add(&entry->list, &free_entries);
469 num_free_entries += 1;
470 spin_unlock_irqrestore(&free_entries_lock, flags);
471}
472
FUJITA Tomonorie6a1a892009-04-15 18:22:41 +0900473int dma_debug_resize_entries(u32 num_entries)
474{
475 int i, delta, ret = 0;
476 unsigned long flags;
477 struct dma_debug_entry *entry;
478 LIST_HEAD(tmp);
479
480 spin_lock_irqsave(&free_entries_lock, flags);
481
482 if (nr_total_entries < num_entries) {
483 delta = num_entries - nr_total_entries;
484
485 spin_unlock_irqrestore(&free_entries_lock, flags);
486
487 for (i = 0; i < delta; i++) {
488 entry = kzalloc(sizeof(*entry), GFP_KERNEL);
489 if (!entry)
490 break;
491
492 list_add_tail(&entry->list, &tmp);
493 }
494
495 spin_lock_irqsave(&free_entries_lock, flags);
496
497 list_splice(&tmp, &free_entries);
498 nr_total_entries += i;
499 num_free_entries += i;
500 } else {
501 delta = nr_total_entries - num_entries;
502
503 for (i = 0; i < delta && !list_empty(&free_entries); i++) {
504 entry = __dma_entry_alloc();
505 kfree(entry);
506 }
507
508 nr_total_entries -= i;
509 }
510
511 if (nr_total_entries != num_entries)
512 ret = 1;
513
514 spin_unlock_irqrestore(&free_entries_lock, flags);
515
516 return ret;
517}
518EXPORT_SYMBOL(dma_debug_resize_entries);
519
Joerg Roedel6bf07872009-01-09 12:54:42 +0100520/*
521 * DMA-API debugging init code
522 *
523 * The init code does two things:
524 * 1. Initialize core data structures
525 * 2. Preallocate a given number of dma_debug_entry structs
526 */
527
528static int prealloc_memory(u32 num_entries)
529{
530 struct dma_debug_entry *entry, *next_entry;
531 int i;
532
533 for (i = 0; i < num_entries; ++i) {
534 entry = kzalloc(sizeof(*entry), GFP_KERNEL);
535 if (!entry)
536 goto out_err;
537
538 list_add_tail(&entry->list, &free_entries);
539 }
540
541 num_free_entries = num_entries;
542 min_free_entries = num_entries;
543
Joerg Roedele7ed70e2009-06-08 15:39:24 +0200544 pr_info("DMA-API: preallocated %d debug entries\n", num_entries);
Joerg Roedel6bf07872009-01-09 12:54:42 +0100545
546 return 0;
547
548out_err:
549
550 list_for_each_entry_safe(entry, next_entry, &free_entries, list) {
551 list_del(&entry->list);
552 kfree(entry);
553 }
554
555 return -ENOMEM;
556}
557
Joerg Roedel8a6fc702009-05-22 21:23:13 +0200558static ssize_t filter_read(struct file *file, char __user *user_buf,
559 size_t count, loff_t *ppos)
560{
Joerg Roedel8a6fc702009-05-22 21:23:13 +0200561 char buf[NAME_MAX_LEN + 1];
Joerg Roedelc17e2cf2009-06-08 15:19:29 +0200562 unsigned long flags;
Joerg Roedel8a6fc702009-05-22 21:23:13 +0200563 int len;
564
565 if (!current_driver_name[0])
566 return 0;
567
568 /*
569 * We can't copy to userspace directly because current_driver_name can
570 * only be read under the driver_name_lock with irqs disabled. So
571 * create a temporary copy first.
572 */
573 read_lock_irqsave(&driver_name_lock, flags);
574 len = scnprintf(buf, NAME_MAX_LEN + 1, "%s\n", current_driver_name);
575 read_unlock_irqrestore(&driver_name_lock, flags);
576
577 return simple_read_from_buffer(user_buf, count, ppos, buf, len);
578}
579
580static ssize_t filter_write(struct file *file, const char __user *userbuf,
581 size_t count, loff_t *ppos)
582{
Joerg Roedel8a6fc702009-05-22 21:23:13 +0200583 char buf[NAME_MAX_LEN];
Joerg Roedelc17e2cf2009-06-08 15:19:29 +0200584 unsigned long flags;
585 size_t len;
Joerg Roedel8a6fc702009-05-22 21:23:13 +0200586 int i;
587
588 /*
589 * We can't copy from userspace directly. Access to
590 * current_driver_name is protected with a write_lock with irqs
591 * disabled. Since copy_from_user can fault and may sleep we
592 * need to copy to temporary buffer first
593 */
Joerg Roedele7ed70e2009-06-08 15:39:24 +0200594 len = min(count, (size_t)(NAME_MAX_LEN - 1));
Joerg Roedel8a6fc702009-05-22 21:23:13 +0200595 if (copy_from_user(buf, userbuf, len))
596 return -EFAULT;
597
598 buf[len] = 0;
599
600 write_lock_irqsave(&driver_name_lock, flags);
601
Joerg Roedel312325092009-06-08 15:07:08 +0200602 /*
603 * Now handle the string we got from userspace very carefully.
Joerg Roedel8a6fc702009-05-22 21:23:13 +0200604 * The rules are:
605 * - only use the first token we got
606 * - token delimiter is everything looking like a space
607 * character (' ', '\n', '\t' ...)
608 *
609 */
610 if (!isalnum(buf[0])) {
611 /*
Joerg Roedel312325092009-06-08 15:07:08 +0200612 * If the first character userspace gave us is not
Joerg Roedel8a6fc702009-05-22 21:23:13 +0200613 * alphanumerical then assume the filter should be
614 * switched off.
615 */
616 if (current_driver_name[0])
Joerg Roedele7ed70e2009-06-08 15:39:24 +0200617 pr_info("DMA-API: switching off dma-debug driver filter\n");
Joerg Roedel8a6fc702009-05-22 21:23:13 +0200618 current_driver_name[0] = 0;
619 current_driver = NULL;
620 goto out_unlock;
621 }
622
623 /*
624 * Now parse out the first token and use it as the name for the
625 * driver to filter for.
626 */
Dan Carpenter39a37ce2010-04-06 19:45:12 +0300627 for (i = 0; i < NAME_MAX_LEN - 1; ++i) {
Joerg Roedel8a6fc702009-05-22 21:23:13 +0200628 current_driver_name[i] = buf[i];
629 if (isspace(buf[i]) || buf[i] == ' ' || buf[i] == 0)
630 break;
631 }
632 current_driver_name[i] = 0;
633 current_driver = NULL;
634
Joerg Roedele7ed70e2009-06-08 15:39:24 +0200635 pr_info("DMA-API: enable driver filter for driver [%s]\n",
636 current_driver_name);
Joerg Roedel8a6fc702009-05-22 21:23:13 +0200637
638out_unlock:
639 write_unlock_irqrestore(&driver_name_lock, flags);
640
641 return count;
642}
643
Thiago Farinaaeb583d2010-01-18 18:57:33 -0500644static const struct file_operations filter_fops = {
Joerg Roedel8a6fc702009-05-22 21:23:13 +0200645 .read = filter_read,
646 .write = filter_write,
Arnd Bergmann6038f372010-08-15 18:52:59 +0200647 .llseek = default_llseek,
Joerg Roedel8a6fc702009-05-22 21:23:13 +0200648};
649
Joerg Roedel788dcfa2009-01-09 13:13:27 +0100650static int dma_debug_fs_init(void)
651{
652 dma_debug_dent = debugfs_create_dir("dma-api", NULL);
653 if (!dma_debug_dent) {
Joerg Roedele7ed70e2009-06-08 15:39:24 +0200654 pr_err("DMA-API: can not create debugfs directory\n");
Joerg Roedel788dcfa2009-01-09 13:13:27 +0100655 return -ENOMEM;
656 }
657
658 global_disable_dent = debugfs_create_bool("disabled", 0444,
659 dma_debug_dent,
660 (u32 *)&global_disable);
661 if (!global_disable_dent)
662 goto out_err;
663
664 error_count_dent = debugfs_create_u32("error_count", 0444,
665 dma_debug_dent, &error_count);
666 if (!error_count_dent)
667 goto out_err;
668
669 show_all_errors_dent = debugfs_create_u32("all_errors", 0644,
670 dma_debug_dent,
671 &show_all_errors);
672 if (!show_all_errors_dent)
673 goto out_err;
674
675 show_num_errors_dent = debugfs_create_u32("num_errors", 0644,
676 dma_debug_dent,
677 &show_num_errors);
678 if (!show_num_errors_dent)
679 goto out_err;
680
681 num_free_entries_dent = debugfs_create_u32("num_free_entries", 0444,
682 dma_debug_dent,
683 &num_free_entries);
684 if (!num_free_entries_dent)
685 goto out_err;
686
687 min_free_entries_dent = debugfs_create_u32("min_free_entries", 0444,
688 dma_debug_dent,
689 &min_free_entries);
690 if (!min_free_entries_dent)
691 goto out_err;
692
Joerg Roedel8a6fc702009-05-22 21:23:13 +0200693 filter_dent = debugfs_create_file("driver_filter", 0644,
694 dma_debug_dent, NULL, &filter_fops);
695 if (!filter_dent)
696 goto out_err;
697
Joerg Roedel788dcfa2009-01-09 13:13:27 +0100698 return 0;
699
700out_err:
701 debugfs_remove_recursive(dma_debug_dent);
702
703 return -ENOMEM;
704}
705
Stanislaw Gruszkaba4b87ad2011-03-31 08:08:09 -0400706static int device_dma_allocations(struct device *dev, struct dma_debug_entry **out_entry)
Joerg Roedeled888ae2009-05-22 17:16:04 +0200707{
708 struct dma_debug_entry *entry;
709 unsigned long flags;
710 int count = 0, i;
711
Joerg Roedelbe81c6e2009-06-08 15:46:19 +0200712 local_irq_save(flags);
713
Joerg Roedeled888ae2009-05-22 17:16:04 +0200714 for (i = 0; i < HASH_SIZE; ++i) {
Joerg Roedelbe81c6e2009-06-08 15:46:19 +0200715 spin_lock(&dma_entry_hash[i].lock);
Joerg Roedeled888ae2009-05-22 17:16:04 +0200716 list_for_each_entry(entry, &dma_entry_hash[i].list, list) {
Stanislaw Gruszkaba4b87ad2011-03-31 08:08:09 -0400717 if (entry->dev == dev) {
Joerg Roedeled888ae2009-05-22 17:16:04 +0200718 count += 1;
Stanislaw Gruszkaba4b87ad2011-03-31 08:08:09 -0400719 *out_entry = entry;
720 }
Joerg Roedeled888ae2009-05-22 17:16:04 +0200721 }
Joerg Roedelbe81c6e2009-06-08 15:46:19 +0200722 spin_unlock(&dma_entry_hash[i].lock);
Joerg Roedeled888ae2009-05-22 17:16:04 +0200723 }
724
Joerg Roedelbe81c6e2009-06-08 15:46:19 +0200725 local_irq_restore(flags);
726
Joerg Roedeled888ae2009-05-22 17:16:04 +0200727 return count;
728}
729
Ingo Molnara8fe9ea2009-12-31 15:16:23 +0100730static int dma_debug_device_change(struct notifier_block *nb, unsigned long action, void *data)
Joerg Roedeled888ae2009-05-22 17:16:04 +0200731{
732 struct device *dev = data;
Stanislaw Gruszkaba4b87ad2011-03-31 08:08:09 -0400733 struct dma_debug_entry *uninitialized_var(entry);
Joerg Roedeled888ae2009-05-22 17:16:04 +0200734 int count;
735
Shaun Ruffellf797d982009-12-17 18:00:36 -0600736 if (global_disable)
Ingo Molnara8fe9ea2009-12-31 15:16:23 +0100737 return 0;
Joerg Roedeled888ae2009-05-22 17:16:04 +0200738
739 switch (action) {
740 case BUS_NOTIFY_UNBOUND_DRIVER:
Stanislaw Gruszkaba4b87ad2011-03-31 08:08:09 -0400741 count = device_dma_allocations(dev, &entry);
Joerg Roedeled888ae2009-05-22 17:16:04 +0200742 if (count == 0)
743 break;
Stanislaw Gruszkaba4b87ad2011-03-31 08:08:09 -0400744 err_printk(dev, entry, "DMA-API: device driver has pending "
Joerg Roedeled888ae2009-05-22 17:16:04 +0200745 "DMA allocations while released from device "
Stanislaw Gruszkaba4b87ad2011-03-31 08:08:09 -0400746 "[count=%d]\n"
747 "One of leaked entries details: "
748 "[device address=0x%016llx] [size=%llu bytes] "
749 "[mapped with %s] [mapped as %s]\n",
750 count, entry->dev_addr, entry->size,
751 dir2name[entry->direction], type2name[entry->type]);
Joerg Roedeled888ae2009-05-22 17:16:04 +0200752 break;
753 default:
754 break;
755 }
756
757 return 0;
758}
759
Joerg Roedel41531c82009-03-16 17:32:14 +0100760void dma_debug_add_bus(struct bus_type *bus)
761{
Joerg Roedeled888ae2009-05-22 17:16:04 +0200762 struct notifier_block *nb;
763
Shaun Ruffellf797d982009-12-17 18:00:36 -0600764 if (global_disable)
765 return;
766
Joerg Roedeled888ae2009-05-22 17:16:04 +0200767 nb = kzalloc(sizeof(struct notifier_block), GFP_KERNEL);
768 if (nb == NULL) {
Joerg Roedele7ed70e2009-06-08 15:39:24 +0200769 pr_err("dma_debug_add_bus: out of memory\n");
Joerg Roedeled888ae2009-05-22 17:16:04 +0200770 return;
771 }
772
773 nb->notifier_call = dma_debug_device_change;
774
775 bus_register_notifier(bus, nb);
Joerg Roedel41531c82009-03-16 17:32:14 +0100776}
Joerg Roedel788dcfa2009-01-09 13:13:27 +0100777
Joerg Roedel6bf07872009-01-09 12:54:42 +0100778/*
779 * Let the architectures decide how many entries should be preallocated.
780 */
781void dma_debug_init(u32 num_entries)
782{
783 int i;
784
785 if (global_disable)
786 return;
787
788 for (i = 0; i < HASH_SIZE; ++i) {
789 INIT_LIST_HEAD(&dma_entry_hash[i].list);
Ingo Molnarb0a5b832009-06-16 16:11:14 +0200790 spin_lock_init(&dma_entry_hash[i].lock);
Joerg Roedel6bf07872009-01-09 12:54:42 +0100791 }
792
Joerg Roedel788dcfa2009-01-09 13:13:27 +0100793 if (dma_debug_fs_init() != 0) {
Joerg Roedele7ed70e2009-06-08 15:39:24 +0200794 pr_err("DMA-API: error creating debugfs entries - disabling\n");
Joerg Roedel788dcfa2009-01-09 13:13:27 +0100795 global_disable = true;
796
797 return;
798 }
799
Joerg Roedel59d3daa2009-01-09 13:01:56 +0100800 if (req_entries)
801 num_entries = req_entries;
802
Joerg Roedel6bf07872009-01-09 12:54:42 +0100803 if (prealloc_memory(num_entries) != 0) {
Joerg Roedele7ed70e2009-06-08 15:39:24 +0200804 pr_err("DMA-API: debugging out of memory error - disabled\n");
Joerg Roedel6bf07872009-01-09 12:54:42 +0100805 global_disable = true;
806
807 return;
808 }
809
FUJITA Tomonorie6a1a892009-04-15 18:22:41 +0900810 nr_total_entries = num_free_entries;
811
Joerg Roedele7ed70e2009-06-08 15:39:24 +0200812 pr_info("DMA-API: debugging enabled by kernel config\n");
Joerg Roedel6bf07872009-01-09 12:54:42 +0100813}
814
Joerg Roedel59d3daa2009-01-09 13:01:56 +0100815static __init int dma_debug_cmdline(char *str)
816{
817 if (!str)
818 return -EINVAL;
819
820 if (strncmp(str, "off", 3) == 0) {
Joerg Roedele7ed70e2009-06-08 15:39:24 +0200821 pr_info("DMA-API: debugging disabled on kernel command line\n");
Joerg Roedel59d3daa2009-01-09 13:01:56 +0100822 global_disable = true;
823 }
824
825 return 0;
826}
827
828static __init int dma_debug_entries_cmdline(char *str)
829{
830 int res;
831
832 if (!str)
833 return -EINVAL;
834
835 res = get_option(&str, &req_entries);
836
837 if (!res)
838 req_entries = 0;
839
840 return 0;
841}
842
843__setup("dma_debug=", dma_debug_cmdline);
844__setup("dma_debug_entries=", dma_debug_entries_cmdline);
845
Joerg Roedel2d62ece2009-01-09 14:10:26 +0100846static void check_unmap(struct dma_debug_entry *ref)
847{
848 struct dma_debug_entry *entry;
849 struct hash_bucket *bucket;
850 unsigned long flags;
851
FUJITA Tomonori35d40952009-03-19 10:39:31 +0900852 if (dma_mapping_error(ref->dev, ref->dev_addr)) {
853 err_printk(ref->dev, NULL, "DMA-API: device driver tries "
854 "to free an invalid DMA memory address\n");
Joerg Roedel2d62ece2009-01-09 14:10:26 +0100855 return;
FUJITA Tomonori35d40952009-03-19 10:39:31 +0900856 }
Joerg Roedel2d62ece2009-01-09 14:10:26 +0100857
858 bucket = get_hash_bucket(ref, &flags);
Neil Hormanc6a21d02011-08-08 15:13:54 -0400859 entry = bucket_find_exact(bucket, ref);
Joerg Roedel2d62ece2009-01-09 14:10:26 +0100860
861 if (!entry) {
David Woodhouse6c132d12009-01-19 16:52:39 +0100862 err_printk(ref->dev, NULL, "DMA-API: device driver tries "
Joerg Roedel2d62ece2009-01-09 14:10:26 +0100863 "to free DMA memory it has not allocated "
864 "[device address=0x%016llx] [size=%llu bytes]\n",
865 ref->dev_addr, ref->size);
866 goto out;
867 }
868
869 if (ref->size != entry->size) {
David Woodhouse6c132d12009-01-19 16:52:39 +0100870 err_printk(ref->dev, entry, "DMA-API: device driver frees "
Joerg Roedel2d62ece2009-01-09 14:10:26 +0100871 "DMA memory with different size "
872 "[device address=0x%016llx] [map size=%llu bytes] "
873 "[unmap size=%llu bytes]\n",
874 ref->dev_addr, entry->size, ref->size);
875 }
876
877 if (ref->type != entry->type) {
David Woodhouse6c132d12009-01-19 16:52:39 +0100878 err_printk(ref->dev, entry, "DMA-API: device driver frees "
Joerg Roedel2d62ece2009-01-09 14:10:26 +0100879 "DMA memory with wrong function "
880 "[device address=0x%016llx] [size=%llu bytes] "
881 "[mapped as %s] [unmapped as %s]\n",
882 ref->dev_addr, ref->size,
883 type2name[entry->type], type2name[ref->type]);
884 } else if ((entry->type == dma_debug_coherent) &&
885 (ref->paddr != entry->paddr)) {
David Woodhouse6c132d12009-01-19 16:52:39 +0100886 err_printk(ref->dev, entry, "DMA-API: device driver frees "
Joerg Roedel2d62ece2009-01-09 14:10:26 +0100887 "DMA memory with different CPU address "
888 "[device address=0x%016llx] [size=%llu bytes] "
Joerg Roedel59a40e702009-10-29 16:25:50 +0100889 "[cpu alloc address=0x%016llx] "
890 "[cpu free address=0x%016llx]",
Joerg Roedel2d62ece2009-01-09 14:10:26 +0100891 ref->dev_addr, ref->size,
Joerg Roedel59a40e702009-10-29 16:25:50 +0100892 (unsigned long long)entry->paddr,
893 (unsigned long long)ref->paddr);
Joerg Roedel2d62ece2009-01-09 14:10:26 +0100894 }
895
896 if (ref->sg_call_ents && ref->type == dma_debug_sg &&
897 ref->sg_call_ents != entry->sg_call_ents) {
David Woodhouse6c132d12009-01-19 16:52:39 +0100898 err_printk(ref->dev, entry, "DMA-API: device driver frees "
Joerg Roedel2d62ece2009-01-09 14:10:26 +0100899 "DMA sg list with different entry count "
900 "[map count=%d] [unmap count=%d]\n",
901 entry->sg_call_ents, ref->sg_call_ents);
902 }
903
904 /*
905 * This may be no bug in reality - but most implementations of the
906 * DMA API don't handle this properly, so check for it here
907 */
908 if (ref->direction != entry->direction) {
David Woodhouse6c132d12009-01-19 16:52:39 +0100909 err_printk(ref->dev, entry, "DMA-API: device driver frees "
Joerg Roedel2d62ece2009-01-09 14:10:26 +0100910 "DMA memory with different direction "
911 "[device address=0x%016llx] [size=%llu bytes] "
912 "[mapped with %s] [unmapped with %s]\n",
913 ref->dev_addr, ref->size,
914 dir2name[entry->direction],
915 dir2name[ref->direction]);
916 }
917
918 hash_bucket_del(entry);
919 dma_entry_free(entry);
920
921out:
922 put_hash_bucket(bucket, &flags);
923}
924
925static void check_for_stack(struct device *dev, void *addr)
926{
927 if (object_is_on_stack(addr))
David Woodhouse6c132d12009-01-19 16:52:39 +0100928 err_printk(dev, NULL, "DMA-API: device driver maps memory from"
929 "stack [addr=%p]\n", addr);
Joerg Roedel2d62ece2009-01-09 14:10:26 +0100930}
931
Ingo Molnarf39d1b92009-07-10 21:38:02 +0200932static inline bool overlap(void *addr, unsigned long len, void *start, void *end)
Joerg Roedel2e34bde2009-03-16 16:51:55 +0100933{
Ingo Molnarf39d1b92009-07-10 21:38:02 +0200934 unsigned long a1 = (unsigned long)addr;
935 unsigned long b1 = a1 + len;
936 unsigned long a2 = (unsigned long)start;
937 unsigned long b2 = (unsigned long)end;
Joerg Roedel2e34bde2009-03-16 16:51:55 +0100938
Ingo Molnarf39d1b92009-07-10 21:38:02 +0200939 return !(b1 <= a2 || a1 >= b2);
Joerg Roedel2e34bde2009-03-16 16:51:55 +0100940}
941
Ingo Molnarf39d1b92009-07-10 21:38:02 +0200942static void check_for_illegal_area(struct device *dev, void *addr, unsigned long len)
Joerg Roedel2e34bde2009-03-16 16:51:55 +0100943{
Ingo Molnarf39d1b92009-07-10 21:38:02 +0200944 if (overlap(addr, len, _text, _etext) ||
945 overlap(addr, len, __start_rodata, __end_rodata))
946 err_printk(dev, NULL, "DMA-API: device driver maps memory from kernel text or rodata [addr=%p] [len=%lu]\n", addr, len);
Joerg Roedel2e34bde2009-03-16 16:51:55 +0100947}
948
Joerg Roedelaa010ef2009-06-12 15:25:06 +0200949static void check_sync(struct device *dev,
950 struct dma_debug_entry *ref,
951 bool to_cpu)
Joerg Roedel2d62ece2009-01-09 14:10:26 +0100952{
Joerg Roedel2d62ece2009-01-09 14:10:26 +0100953 struct dma_debug_entry *entry;
954 struct hash_bucket *bucket;
955 unsigned long flags;
956
Joerg Roedelaa010ef2009-06-12 15:25:06 +0200957 bucket = get_hash_bucket(ref, &flags);
Joerg Roedel2d62ece2009-01-09 14:10:26 +0100958
Neil Hormanc6a21d02011-08-08 15:13:54 -0400959 entry = bucket_find_contain(&bucket, ref, &flags);
Joerg Roedel2d62ece2009-01-09 14:10:26 +0100960
961 if (!entry) {
David Woodhouse6c132d12009-01-19 16:52:39 +0100962 err_printk(dev, NULL, "DMA-API: device driver tries "
Joerg Roedel2d62ece2009-01-09 14:10:26 +0100963 "to sync DMA memory it has not allocated "
964 "[device address=0x%016llx] [size=%llu bytes]\n",
Joerg Roedelaa010ef2009-06-12 15:25:06 +0200965 (unsigned long long)ref->dev_addr, ref->size);
Joerg Roedel2d62ece2009-01-09 14:10:26 +0100966 goto out;
967 }
968
Joerg Roedelaa010ef2009-06-12 15:25:06 +0200969 if (ref->size > entry->size) {
David Woodhouse6c132d12009-01-19 16:52:39 +0100970 err_printk(dev, entry, "DMA-API: device driver syncs"
Joerg Roedel2d62ece2009-01-09 14:10:26 +0100971 " DMA memory outside allocated range "
972 "[device address=0x%016llx] "
Joerg Roedelaa010ef2009-06-12 15:25:06 +0200973 "[allocation size=%llu bytes] "
974 "[sync offset+size=%llu]\n",
975 entry->dev_addr, entry->size,
976 ref->size);
Joerg Roedel2d62ece2009-01-09 14:10:26 +0100977 }
978
Krzysztof Halasa42d53b42010-01-08 14:42:36 -0800979 if (entry->direction == DMA_BIDIRECTIONAL)
980 goto out;
981
Joerg Roedelaa010ef2009-06-12 15:25:06 +0200982 if (ref->direction != entry->direction) {
David Woodhouse6c132d12009-01-19 16:52:39 +0100983 err_printk(dev, entry, "DMA-API: device driver syncs "
Joerg Roedel2d62ece2009-01-09 14:10:26 +0100984 "DMA memory with different direction "
985 "[device address=0x%016llx] [size=%llu bytes] "
986 "[mapped with %s] [synced with %s]\n",
Joerg Roedelaa010ef2009-06-12 15:25:06 +0200987 (unsigned long long)ref->dev_addr, entry->size,
Joerg Roedel2d62ece2009-01-09 14:10:26 +0100988 dir2name[entry->direction],
Joerg Roedelaa010ef2009-06-12 15:25:06 +0200989 dir2name[ref->direction]);
Joerg Roedel2d62ece2009-01-09 14:10:26 +0100990 }
991
Joerg Roedel2d62ece2009-01-09 14:10:26 +0100992 if (to_cpu && !(entry->direction == DMA_FROM_DEVICE) &&
Joerg Roedelaa010ef2009-06-12 15:25:06 +0200993 !(ref->direction == DMA_TO_DEVICE))
David Woodhouse6c132d12009-01-19 16:52:39 +0100994 err_printk(dev, entry, "DMA-API: device driver syncs "
Joerg Roedel2d62ece2009-01-09 14:10:26 +0100995 "device read-only DMA memory for cpu "
996 "[device address=0x%016llx] [size=%llu bytes] "
997 "[mapped with %s] [synced with %s]\n",
Joerg Roedelaa010ef2009-06-12 15:25:06 +0200998 (unsigned long long)ref->dev_addr, entry->size,
Joerg Roedel2d62ece2009-01-09 14:10:26 +0100999 dir2name[entry->direction],
Joerg Roedelaa010ef2009-06-12 15:25:06 +02001000 dir2name[ref->direction]);
Joerg Roedel2d62ece2009-01-09 14:10:26 +01001001
1002 if (!to_cpu && !(entry->direction == DMA_TO_DEVICE) &&
Joerg Roedelaa010ef2009-06-12 15:25:06 +02001003 !(ref->direction == DMA_FROM_DEVICE))
David Woodhouse6c132d12009-01-19 16:52:39 +01001004 err_printk(dev, entry, "DMA-API: device driver syncs "
Joerg Roedel2d62ece2009-01-09 14:10:26 +01001005 "device write-only DMA memory to device "
1006 "[device address=0x%016llx] [size=%llu bytes] "
1007 "[mapped with %s] [synced with %s]\n",
Joerg Roedelaa010ef2009-06-12 15:25:06 +02001008 (unsigned long long)ref->dev_addr, entry->size,
Joerg Roedel2d62ece2009-01-09 14:10:26 +01001009 dir2name[entry->direction],
Joerg Roedelaa010ef2009-06-12 15:25:06 +02001010 dir2name[ref->direction]);
Joerg Roedel2d62ece2009-01-09 14:10:26 +01001011
1012out:
1013 put_hash_bucket(bucket, &flags);
Joerg Roedel2d62ece2009-01-09 14:10:26 +01001014}
1015
Joerg Roedelf62bc982009-01-09 14:14:49 +01001016void debug_dma_map_page(struct device *dev, struct page *page, size_t offset,
1017 size_t size, int direction, dma_addr_t dma_addr,
1018 bool map_single)
1019{
1020 struct dma_debug_entry *entry;
1021
1022 if (unlikely(global_disable))
1023 return;
1024
1025 if (unlikely(dma_mapping_error(dev, dma_addr)))
1026 return;
1027
1028 entry = dma_entry_alloc();
1029 if (!entry)
1030 return;
1031
1032 entry->dev = dev;
1033 entry->type = dma_debug_page;
1034 entry->paddr = page_to_phys(page) + offset;
1035 entry->dev_addr = dma_addr;
1036 entry->size = size;
1037 entry->direction = direction;
1038
Joerg Roedel9537a482009-03-23 15:35:08 +01001039 if (map_single)
Joerg Roedelf62bc982009-01-09 14:14:49 +01001040 entry->type = dma_debug_single;
Joerg Roedel9537a482009-03-23 15:35:08 +01001041
1042 if (!PageHighMem(page)) {
Ingo Molnarf39d1b92009-07-10 21:38:02 +02001043 void *addr = page_address(page) + offset;
1044
Joerg Roedel2e34bde2009-03-16 16:51:55 +01001045 check_for_stack(dev, addr);
1046 check_for_illegal_area(dev, addr, size);
Joerg Roedelf62bc982009-01-09 14:14:49 +01001047 }
1048
1049 add_dma_entry(entry);
1050}
1051EXPORT_SYMBOL(debug_dma_map_page);
1052
1053void debug_dma_unmap_page(struct device *dev, dma_addr_t addr,
1054 size_t size, int direction, bool map_single)
1055{
1056 struct dma_debug_entry ref = {
1057 .type = dma_debug_page,
1058 .dev = dev,
1059 .dev_addr = addr,
1060 .size = size,
1061 .direction = direction,
1062 };
1063
1064 if (unlikely(global_disable))
1065 return;
1066
1067 if (map_single)
1068 ref.type = dma_debug_single;
1069
1070 check_unmap(&ref);
1071}
1072EXPORT_SYMBOL(debug_dma_unmap_page);
1073
Joerg Roedel972aa452009-01-09 14:19:54 +01001074void debug_dma_map_sg(struct device *dev, struct scatterlist *sg,
1075 int nents, int mapped_ents, int direction)
1076{
1077 struct dma_debug_entry *entry;
1078 struct scatterlist *s;
1079 int i;
1080
1081 if (unlikely(global_disable))
1082 return;
1083
1084 for_each_sg(sg, s, mapped_ents, i) {
1085 entry = dma_entry_alloc();
1086 if (!entry)
1087 return;
1088
1089 entry->type = dma_debug_sg;
1090 entry->dev = dev;
1091 entry->paddr = sg_phys(s);
FUJITA Tomonori884d0592009-05-27 09:43:02 +09001092 entry->size = sg_dma_len(s);
FUJITA Tomonori15aedea2009-05-27 09:43:01 +09001093 entry->dev_addr = sg_dma_address(s);
Joerg Roedel972aa452009-01-09 14:19:54 +01001094 entry->direction = direction;
1095 entry->sg_call_ents = nents;
1096 entry->sg_mapped_ents = mapped_ents;
1097
Joerg Roedel9537a482009-03-23 15:35:08 +01001098 if (!PageHighMem(sg_page(s))) {
1099 check_for_stack(dev, sg_virt(s));
FUJITA Tomonori884d0592009-05-27 09:43:02 +09001100 check_for_illegal_area(dev, sg_virt(s), sg_dma_len(s));
Joerg Roedel9537a482009-03-23 15:35:08 +01001101 }
Joerg Roedel972aa452009-01-09 14:19:54 +01001102
1103 add_dma_entry(entry);
1104 }
1105}
1106EXPORT_SYMBOL(debug_dma_map_sg);
1107
Joerg Roedelaa010ef2009-06-12 15:25:06 +02001108static int get_nr_mapped_entries(struct device *dev,
1109 struct dma_debug_entry *ref)
FUJITA Tomonori88f39072009-05-27 09:43:03 +09001110{
Joerg Roedelaa010ef2009-06-12 15:25:06 +02001111 struct dma_debug_entry *entry;
FUJITA Tomonori88f39072009-05-27 09:43:03 +09001112 struct hash_bucket *bucket;
1113 unsigned long flags;
Joerg Roedelc17e2cf2009-06-08 15:19:29 +02001114 int mapped_ents;
FUJITA Tomonori88f39072009-05-27 09:43:03 +09001115
Joerg Roedelaa010ef2009-06-12 15:25:06 +02001116 bucket = get_hash_bucket(ref, &flags);
Neil Hormanc6a21d02011-08-08 15:13:54 -04001117 entry = bucket_find_exact(bucket, ref);
Joerg Roedelc17e2cf2009-06-08 15:19:29 +02001118 mapped_ents = 0;
1119
FUJITA Tomonori88f39072009-05-27 09:43:03 +09001120 if (entry)
1121 mapped_ents = entry->sg_mapped_ents;
1122 put_hash_bucket(bucket, &flags);
1123
1124 return mapped_ents;
1125}
1126
Joerg Roedel972aa452009-01-09 14:19:54 +01001127void debug_dma_unmap_sg(struct device *dev, struct scatterlist *sglist,
1128 int nelems, int dir)
1129{
Joerg Roedel972aa452009-01-09 14:19:54 +01001130 struct scatterlist *s;
1131 int mapped_ents = 0, i;
Joerg Roedel972aa452009-01-09 14:19:54 +01001132
1133 if (unlikely(global_disable))
1134 return;
1135
1136 for_each_sg(sglist, s, nelems, i) {
1137
1138 struct dma_debug_entry ref = {
1139 .type = dma_debug_sg,
1140 .dev = dev,
1141 .paddr = sg_phys(s),
FUJITA Tomonori15aedea2009-05-27 09:43:01 +09001142 .dev_addr = sg_dma_address(s),
FUJITA Tomonori884d0592009-05-27 09:43:02 +09001143 .size = sg_dma_len(s),
Joerg Roedel972aa452009-01-09 14:19:54 +01001144 .direction = dir,
Joerg Roedele5e8c5b2009-06-11 10:03:42 +02001145 .sg_call_ents = nelems,
Joerg Roedel972aa452009-01-09 14:19:54 +01001146 };
1147
1148 if (mapped_ents && i >= mapped_ents)
1149 break;
1150
Joerg Roedele5e8c5b2009-06-11 10:03:42 +02001151 if (!i)
Joerg Roedelaa010ef2009-06-12 15:25:06 +02001152 mapped_ents = get_nr_mapped_entries(dev, &ref);
Joerg Roedel972aa452009-01-09 14:19:54 +01001153
1154 check_unmap(&ref);
1155 }
1156}
1157EXPORT_SYMBOL(debug_dma_unmap_sg);
1158
Joerg Roedel6bfd4492009-01-09 14:38:50 +01001159void debug_dma_alloc_coherent(struct device *dev, size_t size,
1160 dma_addr_t dma_addr, void *virt)
1161{
1162 struct dma_debug_entry *entry;
1163
1164 if (unlikely(global_disable))
1165 return;
1166
1167 if (unlikely(virt == NULL))
1168 return;
1169
1170 entry = dma_entry_alloc();
1171 if (!entry)
1172 return;
1173
1174 entry->type = dma_debug_coherent;
1175 entry->dev = dev;
1176 entry->paddr = virt_to_phys(virt);
1177 entry->size = size;
1178 entry->dev_addr = dma_addr;
1179 entry->direction = DMA_BIDIRECTIONAL;
1180
1181 add_dma_entry(entry);
1182}
1183EXPORT_SYMBOL(debug_dma_alloc_coherent);
1184
1185void debug_dma_free_coherent(struct device *dev, size_t size,
1186 void *virt, dma_addr_t addr)
1187{
1188 struct dma_debug_entry ref = {
1189 .type = dma_debug_coherent,
1190 .dev = dev,
1191 .paddr = virt_to_phys(virt),
1192 .dev_addr = addr,
1193 .size = size,
1194 .direction = DMA_BIDIRECTIONAL,
1195 };
1196
1197 if (unlikely(global_disable))
1198 return;
1199
1200 check_unmap(&ref);
1201}
1202EXPORT_SYMBOL(debug_dma_free_coherent);
1203
Joerg Roedelb9d23172009-01-09 14:43:04 +01001204void debug_dma_sync_single_for_cpu(struct device *dev, dma_addr_t dma_handle,
1205 size_t size, int direction)
1206{
Joerg Roedelaa010ef2009-06-12 15:25:06 +02001207 struct dma_debug_entry ref;
1208
Joerg Roedelb9d23172009-01-09 14:43:04 +01001209 if (unlikely(global_disable))
1210 return;
1211
Joerg Roedelaa010ef2009-06-12 15:25:06 +02001212 ref.type = dma_debug_single;
1213 ref.dev = dev;
1214 ref.dev_addr = dma_handle;
1215 ref.size = size;
1216 ref.direction = direction;
1217 ref.sg_call_ents = 0;
1218
1219 check_sync(dev, &ref, true);
Joerg Roedelb9d23172009-01-09 14:43:04 +01001220}
1221EXPORT_SYMBOL(debug_dma_sync_single_for_cpu);
1222
1223void debug_dma_sync_single_for_device(struct device *dev,
1224 dma_addr_t dma_handle, size_t size,
1225 int direction)
1226{
Joerg Roedelaa010ef2009-06-12 15:25:06 +02001227 struct dma_debug_entry ref;
1228
Joerg Roedelb9d23172009-01-09 14:43:04 +01001229 if (unlikely(global_disable))
1230 return;
1231
Joerg Roedelaa010ef2009-06-12 15:25:06 +02001232 ref.type = dma_debug_single;
1233 ref.dev = dev;
1234 ref.dev_addr = dma_handle;
1235 ref.size = size;
1236 ref.direction = direction;
1237 ref.sg_call_ents = 0;
1238
1239 check_sync(dev, &ref, false);
Joerg Roedelb9d23172009-01-09 14:43:04 +01001240}
1241EXPORT_SYMBOL(debug_dma_sync_single_for_device);
1242
Joerg Roedel948408b2009-01-09 14:55:38 +01001243void debug_dma_sync_single_range_for_cpu(struct device *dev,
1244 dma_addr_t dma_handle,
1245 unsigned long offset, size_t size,
1246 int direction)
1247{
Joerg Roedelaa010ef2009-06-12 15:25:06 +02001248 struct dma_debug_entry ref;
1249
Joerg Roedel948408b2009-01-09 14:55:38 +01001250 if (unlikely(global_disable))
1251 return;
1252
Joerg Roedelaa010ef2009-06-12 15:25:06 +02001253 ref.type = dma_debug_single;
1254 ref.dev = dev;
1255 ref.dev_addr = dma_handle;
1256 ref.size = offset + size;
1257 ref.direction = direction;
1258 ref.sg_call_ents = 0;
1259
1260 check_sync(dev, &ref, true);
Joerg Roedel948408b2009-01-09 14:55:38 +01001261}
1262EXPORT_SYMBOL(debug_dma_sync_single_range_for_cpu);
1263
1264void debug_dma_sync_single_range_for_device(struct device *dev,
1265 dma_addr_t dma_handle,
1266 unsigned long offset,
1267 size_t size, int direction)
1268{
Joerg Roedelaa010ef2009-06-12 15:25:06 +02001269 struct dma_debug_entry ref;
1270
Joerg Roedel948408b2009-01-09 14:55:38 +01001271 if (unlikely(global_disable))
1272 return;
1273
Joerg Roedelaa010ef2009-06-12 15:25:06 +02001274 ref.type = dma_debug_single;
1275 ref.dev = dev;
1276 ref.dev_addr = dma_handle;
1277 ref.size = offset + size;
1278 ref.direction = direction;
1279 ref.sg_call_ents = 0;
1280
1281 check_sync(dev, &ref, false);
Joerg Roedel948408b2009-01-09 14:55:38 +01001282}
1283EXPORT_SYMBOL(debug_dma_sync_single_range_for_device);
1284
Joerg Roedela31fba52009-01-09 15:01:12 +01001285void debug_dma_sync_sg_for_cpu(struct device *dev, struct scatterlist *sg,
1286 int nelems, int direction)
1287{
1288 struct scatterlist *s;
FUJITA Tomonori88f39072009-05-27 09:43:03 +09001289 int mapped_ents = 0, i;
Joerg Roedela31fba52009-01-09 15:01:12 +01001290
1291 if (unlikely(global_disable))
1292 return;
1293
1294 for_each_sg(sg, s, nelems, i) {
Joerg Roedelaa010ef2009-06-12 15:25:06 +02001295
1296 struct dma_debug_entry ref = {
1297 .type = dma_debug_sg,
1298 .dev = dev,
1299 .paddr = sg_phys(s),
1300 .dev_addr = sg_dma_address(s),
1301 .size = sg_dma_len(s),
1302 .direction = direction,
1303 .sg_call_ents = nelems,
1304 };
1305
FUJITA Tomonori88f39072009-05-27 09:43:03 +09001306 if (!i)
Joerg Roedelaa010ef2009-06-12 15:25:06 +02001307 mapped_ents = get_nr_mapped_entries(dev, &ref);
FUJITA Tomonori88f39072009-05-27 09:43:03 +09001308
1309 if (i >= mapped_ents)
1310 break;
1311
Joerg Roedelaa010ef2009-06-12 15:25:06 +02001312 check_sync(dev, &ref, true);
Joerg Roedela31fba52009-01-09 15:01:12 +01001313 }
1314}
1315EXPORT_SYMBOL(debug_dma_sync_sg_for_cpu);
1316
1317void debug_dma_sync_sg_for_device(struct device *dev, struct scatterlist *sg,
1318 int nelems, int direction)
1319{
1320 struct scatterlist *s;
FUJITA Tomonori88f39072009-05-27 09:43:03 +09001321 int mapped_ents = 0, i;
Joerg Roedela31fba52009-01-09 15:01:12 +01001322
1323 if (unlikely(global_disable))
1324 return;
1325
1326 for_each_sg(sg, s, nelems, i) {
Joerg Roedelaa010ef2009-06-12 15:25:06 +02001327
1328 struct dma_debug_entry ref = {
1329 .type = dma_debug_sg,
1330 .dev = dev,
1331 .paddr = sg_phys(s),
1332 .dev_addr = sg_dma_address(s),
1333 .size = sg_dma_len(s),
1334 .direction = direction,
1335 .sg_call_ents = nelems,
1336 };
FUJITA Tomonori88f39072009-05-27 09:43:03 +09001337 if (!i)
Joerg Roedelaa010ef2009-06-12 15:25:06 +02001338 mapped_ents = get_nr_mapped_entries(dev, &ref);
FUJITA Tomonori88f39072009-05-27 09:43:03 +09001339
1340 if (i >= mapped_ents)
1341 break;
1342
Joerg Roedelaa010ef2009-06-12 15:25:06 +02001343 check_sync(dev, &ref, false);
Joerg Roedela31fba52009-01-09 15:01:12 +01001344 }
1345}
1346EXPORT_SYMBOL(debug_dma_sync_sg_for_device);
1347
Joerg Roedel1745de52009-05-22 21:49:51 +02001348static int __init dma_debug_driver_setup(char *str)
1349{
1350 int i;
1351
1352 for (i = 0; i < NAME_MAX_LEN - 1; ++i, ++str) {
1353 current_driver_name[i] = *str;
1354 if (*str == 0)
1355 break;
1356 }
1357
1358 if (current_driver_name[0])
Joerg Roedele7ed70e2009-06-08 15:39:24 +02001359 pr_info("DMA-API: enable driver filter for driver [%s]\n",
1360 current_driver_name);
Joerg Roedel1745de52009-05-22 21:49:51 +02001361
1362
1363 return 1;
1364}
1365__setup("dma_debug_driver=", dma_debug_driver_setup);