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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 */
Dan Carpenter68ee6d22012-06-27 12:08:55 +030081static u32 global_disable __read_mostly;
Joerg Roedel3b1e79e2009-01-09 12:42:46 +010082
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
123/*
124 * The access to some variables in this macro is racy. We can't use atomic_t
125 * here because all these variables are exported to debugfs. Some of them even
126 * writeable. This is also the reason why a lock won't help much. But anyway,
127 * the races are no big deal. Here is why:
128 *
129 * error_count: the addition is racy, but the worst thing that can happen is
130 * that we don't count some errors
131 * show_num_errors: the subtraction is racy. Also no big deal because in
132 * worst case this will result in one warning more in the
133 * system log than the user configured. This variable is
134 * writeable via debugfs.
135 */
David Woodhouse6c132d12009-01-19 16:52:39 +0100136static inline void dump_entry_trace(struct dma_debug_entry *entry)
137{
138#ifdef CONFIG_STACKTRACE
139 if (entry) {
Joerg Roedele7ed70e2009-06-08 15:39:24 +0200140 pr_warning("Mapped at:\n");
David Woodhouse6c132d12009-01-19 16:52:39 +0100141 print_stack_trace(&entry->stacktrace, 0);
142 }
143#endif
144}
145
Joerg Roedel2e507d82009-05-22 18:24:20 +0200146static bool driver_filter(struct device *dev)
147{
Joerg Roedel0bf84122009-06-08 15:53:46 +0200148 struct device_driver *drv;
149 unsigned long flags;
150 bool ret;
151
Joerg Roedel2e507d82009-05-22 18:24:20 +0200152 /* driver filter off */
153 if (likely(!current_driver_name[0]))
154 return true;
155
156 /* driver filter on and initialized */
Kyle McMartinec9c96e2009-08-19 21:17:08 -0400157 if (current_driver && dev && dev->driver == current_driver)
Joerg Roedel2e507d82009-05-22 18:24:20 +0200158 return true;
159
Kyle McMartinec9c96e2009-08-19 21:17:08 -0400160 /* driver filter on, but we can't filter on a NULL device... */
161 if (!dev)
162 return false;
163
Joerg Roedel0bf84122009-06-08 15:53:46 +0200164 if (current_driver || !current_driver_name[0])
165 return false;
166
Joerg Roedel2e507d82009-05-22 18:24:20 +0200167 /* driver filter on but not yet initialized */
Alan Sternf3ff9242012-01-24 13:35:24 -0500168 drv = dev->driver;
Joerg Roedel0bf84122009-06-08 15:53:46 +0200169 if (!drv)
170 return false;
Joerg Roedel2e507d82009-05-22 18:24:20 +0200171
Joerg Roedel0bf84122009-06-08 15:53:46 +0200172 /* lock to protect against change of current_driver_name */
173 read_lock_irqsave(&driver_name_lock, flags);
Joerg Roedel2e507d82009-05-22 18:24:20 +0200174
Joerg Roedel0bf84122009-06-08 15:53:46 +0200175 ret = false;
176 if (drv->name &&
177 strncmp(current_driver_name, drv->name, NAME_MAX_LEN - 1) == 0) {
178 current_driver = drv;
179 ret = true;
Joerg Roedel2e507d82009-05-22 18:24:20 +0200180 }
181
Joerg Roedel0bf84122009-06-08 15:53:46 +0200182 read_unlock_irqrestore(&driver_name_lock, flags);
Joerg Roedel0bf84122009-06-08 15:53:46 +0200183
184 return ret;
Joerg Roedel2e507d82009-05-22 18:24:20 +0200185}
186
Kyle McMartinec9c96e2009-08-19 21:17:08 -0400187#define err_printk(dev, entry, format, arg...) do { \
188 error_count += 1; \
189 if (driver_filter(dev) && \
190 (show_all_errors || show_num_errors > 0)) { \
191 WARN(1, "%s %s: " format, \
192 dev ? dev_driver_string(dev) : "NULL", \
193 dev ? dev_name(dev) : "NULL", ## arg); \
194 dump_entry_trace(entry); \
195 } \
196 if (!show_all_errors && show_num_errors > 0) \
197 show_num_errors -= 1; \
Joerg Roedel2d62ece2009-01-09 14:10:26 +0100198 } while (0);
199
Joerg Roedel30dfa902009-01-09 12:34:49 +0100200/*
201 * Hash related functions
202 *
203 * Every DMA-API request is saved into a struct dma_debug_entry. To
204 * have quick access to these structs they are stored into a hash.
205 */
206static int hash_fn(struct dma_debug_entry *entry)
207{
208 /*
209 * Hash function is based on the dma address.
210 * We use bits 20-27 here as the index into the hash
211 */
212 return (entry->dev_addr >> HASH_FN_SHIFT) & HASH_FN_MASK;
213}
214
215/*
216 * Request exclusive access to a hash bucket for a given dma_debug_entry.
217 */
218static struct hash_bucket *get_hash_bucket(struct dma_debug_entry *entry,
219 unsigned long *flags)
220{
221 int idx = hash_fn(entry);
222 unsigned long __flags;
223
224 spin_lock_irqsave(&dma_entry_hash[idx].lock, __flags);
225 *flags = __flags;
226 return &dma_entry_hash[idx];
227}
228
229/*
230 * Give up exclusive access to the hash bucket
231 */
232static void put_hash_bucket(struct hash_bucket *bucket,
233 unsigned long *flags)
234{
235 unsigned long __flags = *flags;
236
237 spin_unlock_irqrestore(&bucket->lock, __flags);
238}
239
Neil Hormanc6a21d02011-08-08 15:13:54 -0400240static bool exact_match(struct dma_debug_entry *a, struct dma_debug_entry *b)
241{
Thomas Jarosch91ec37c2011-11-17 20:31:02 +0100242 return ((a->dev_addr == b->dev_addr) &&
Neil Hormanc6a21d02011-08-08 15:13:54 -0400243 (a->dev == b->dev)) ? true : false;
244}
245
246static bool containing_match(struct dma_debug_entry *a,
247 struct dma_debug_entry *b)
248{
249 if (a->dev != b->dev)
250 return false;
251
252 if ((b->dev_addr <= a->dev_addr) &&
253 ((b->dev_addr + b->size) >= (a->dev_addr + a->size)))
254 return true;
255
256 return false;
257}
258
Joerg Roedel30dfa902009-01-09 12:34:49 +0100259/*
260 * Search a given entry in the hash bucket list
261 */
Neil Hormanc6a21d02011-08-08 15:13:54 -0400262static struct dma_debug_entry *__hash_bucket_find(struct hash_bucket *bucket,
263 struct dma_debug_entry *ref,
264 match_fn match)
Joerg Roedel30dfa902009-01-09 12:34:49 +0100265{
Joerg Roedel7caf6a42009-06-05 12:01:35 +0200266 struct dma_debug_entry *entry, *ret = NULL;
Ming Leife73fbe2012-10-19 13:57:01 -0700267 int matches = 0, match_lvl, last_lvl = -1;
Joerg Roedel30dfa902009-01-09 12:34:49 +0100268
269 list_for_each_entry(entry, &bucket->list, list) {
Neil Hormanc6a21d02011-08-08 15:13:54 -0400270 if (!match(ref, entry))
Joerg Roedel7caf6a42009-06-05 12:01:35 +0200271 continue;
272
273 /*
274 * Some drivers map the same physical address multiple
275 * times. Without a hardware IOMMU this results in the
276 * same device addresses being put into the dma-debug
277 * hash multiple times too. This can result in false
André Goddard Rosaaf901ca2009-11-14 13:09:05 -0200278 * positives being reported. Therefore we implement a
Joerg Roedel7caf6a42009-06-05 12:01:35 +0200279 * best-fit algorithm here which returns the entry from
280 * the hash which fits best to the reference value
281 * instead of the first-fit.
282 */
283 matches += 1;
284 match_lvl = 0;
Joerg Roedele5e8c5b2009-06-11 10:03:42 +0200285 entry->size == ref->size ? ++match_lvl : 0;
286 entry->type == ref->type ? ++match_lvl : 0;
287 entry->direction == ref->direction ? ++match_lvl : 0;
288 entry->sg_call_ents == ref->sg_call_ents ? ++match_lvl : 0;
Joerg Roedel7caf6a42009-06-05 12:01:35 +0200289
Joerg Roedele5e8c5b2009-06-11 10:03:42 +0200290 if (match_lvl == 4) {
Joerg Roedel7caf6a42009-06-05 12:01:35 +0200291 /* perfect-fit - return the result */
Joerg Roedel30dfa902009-01-09 12:34:49 +0100292 return entry;
Joerg Roedel7caf6a42009-06-05 12:01:35 +0200293 } else if (match_lvl > last_lvl) {
294 /*
295 * We found an entry that fits better then the
Ming Leife73fbe2012-10-19 13:57:01 -0700296 * previous one or it is the 1st match.
Joerg Roedel7caf6a42009-06-05 12:01:35 +0200297 */
298 last_lvl = match_lvl;
299 ret = entry;
300 }
Joerg Roedel30dfa902009-01-09 12:34:49 +0100301 }
302
Joerg Roedel7caf6a42009-06-05 12:01:35 +0200303 /*
304 * If we have multiple matches but no perfect-fit, just return
305 * NULL.
306 */
307 ret = (matches == 1) ? ret : NULL;
308
309 return ret;
Joerg Roedel30dfa902009-01-09 12:34:49 +0100310}
311
Neil Hormanc6a21d02011-08-08 15:13:54 -0400312static struct dma_debug_entry *bucket_find_exact(struct hash_bucket *bucket,
313 struct dma_debug_entry *ref)
314{
315 return __hash_bucket_find(bucket, ref, exact_match);
316}
317
318static struct dma_debug_entry *bucket_find_contain(struct hash_bucket **bucket,
319 struct dma_debug_entry *ref,
320 unsigned long *flags)
321{
322
323 unsigned int max_range = dma_get_max_seg_size(ref->dev);
324 struct dma_debug_entry *entry, index = *ref;
325 unsigned int range = 0;
326
327 while (range <= max_range) {
328 entry = __hash_bucket_find(*bucket, &index, containing_match);
329
330 if (entry)
331 return entry;
332
333 /*
334 * Nothing found, go back a hash bucket
335 */
336 put_hash_bucket(*bucket, flags);
337 range += (1 << HASH_FN_SHIFT);
338 index.dev_addr -= (1 << HASH_FN_SHIFT);
339 *bucket = get_hash_bucket(&index, flags);
340 }
341
342 return NULL;
343}
344
Joerg Roedel30dfa902009-01-09 12:34:49 +0100345/*
346 * Add an entry to a hash bucket
347 */
348static void hash_bucket_add(struct hash_bucket *bucket,
349 struct dma_debug_entry *entry)
350{
351 list_add_tail(&entry->list, &bucket->list);
352}
353
354/*
355 * Remove entry from a hash bucket list
356 */
357static void hash_bucket_del(struct dma_debug_entry *entry)
358{
359 list_del(&entry->list);
360}
361
362/*
David Woodhouseac26c182009-02-12 16:19:13 +0100363 * Dump mapping entries for debugging purposes
364 */
365void debug_dma_dump_mappings(struct device *dev)
366{
367 int idx;
368
369 for (idx = 0; idx < HASH_SIZE; idx++) {
370 struct hash_bucket *bucket = &dma_entry_hash[idx];
371 struct dma_debug_entry *entry;
372 unsigned long flags;
373
374 spin_lock_irqsave(&bucket->lock, flags);
375
376 list_for_each_entry(entry, &bucket->list, list) {
377 if (!dev || dev == entry->dev) {
378 dev_info(entry->dev,
379 "%s idx %d P=%Lx D=%Lx L=%Lx %s\n",
380 type2name[entry->type], idx,
381 (unsigned long long)entry->paddr,
382 entry->dev_addr, entry->size,
383 dir2name[entry->direction]);
384 }
385 }
386
387 spin_unlock_irqrestore(&bucket->lock, flags);
388 }
389}
390EXPORT_SYMBOL(debug_dma_dump_mappings);
391
392/*
Joerg Roedel30dfa902009-01-09 12:34:49 +0100393 * Wrapper function for adding an entry to the hash.
394 * This function takes care of locking itself.
395 */
396static void add_dma_entry(struct dma_debug_entry *entry)
397{
398 struct hash_bucket *bucket;
399 unsigned long flags;
400
401 bucket = get_hash_bucket(entry, &flags);
402 hash_bucket_add(bucket, entry);
403 put_hash_bucket(bucket, &flags);
404}
405
FUJITA Tomonorie6a1a892009-04-15 18:22:41 +0900406static struct dma_debug_entry *__dma_entry_alloc(void)
407{
408 struct dma_debug_entry *entry;
409
410 entry = list_entry(free_entries.next, struct dma_debug_entry, list);
411 list_del(&entry->list);
412 memset(entry, 0, sizeof(*entry));
413
414 num_free_entries -= 1;
415 if (num_free_entries < min_free_entries)
416 min_free_entries = num_free_entries;
417
418 return entry;
419}
420
Joerg Roedel3b1e79e2009-01-09 12:42:46 +0100421/* struct dma_entry allocator
422 *
423 * The next two functions implement the allocator for
424 * struct dma_debug_entries.
425 */
426static struct dma_debug_entry *dma_entry_alloc(void)
427{
Jakub Kicinski29cdd4e2012-04-04 03:19:10 +0200428 struct dma_debug_entry *entry;
Joerg Roedel3b1e79e2009-01-09 12:42:46 +0100429 unsigned long flags;
430
431 spin_lock_irqsave(&free_entries_lock, flags);
432
433 if (list_empty(&free_entries)) {
Joerg Roedele7ed70e2009-06-08 15:39:24 +0200434 pr_err("DMA-API: debugging out of memory - disabling\n");
Joerg Roedel3b1e79e2009-01-09 12:42:46 +0100435 global_disable = true;
Jakub Kicinski29cdd4e2012-04-04 03:19:10 +0200436 spin_unlock_irqrestore(&free_entries_lock, flags);
437 return NULL;
Joerg Roedel3b1e79e2009-01-09 12:42:46 +0100438 }
439
FUJITA Tomonorie6a1a892009-04-15 18:22:41 +0900440 entry = __dma_entry_alloc();
Joerg Roedel3b1e79e2009-01-09 12:42:46 +0100441
Jakub Kicinski29cdd4e2012-04-04 03:19:10 +0200442 spin_unlock_irqrestore(&free_entries_lock, flags);
443
David Woodhouse6c132d12009-01-19 16:52:39 +0100444#ifdef CONFIG_STACKTRACE
445 entry->stacktrace.max_entries = DMA_DEBUG_STACKTRACE_ENTRIES;
446 entry->stacktrace.entries = entry->st_entries;
447 entry->stacktrace.skip = 2;
448 save_stack_trace(&entry->stacktrace);
449#endif
Joerg Roedel3b1e79e2009-01-09 12:42:46 +0100450
Joerg Roedel3b1e79e2009-01-09 12:42:46 +0100451 return entry;
452}
453
454static void dma_entry_free(struct dma_debug_entry *entry)
455{
456 unsigned long flags;
457
458 /*
459 * add to beginning of the list - this way the entries are
460 * more likely cache hot when they are reallocated.
461 */
462 spin_lock_irqsave(&free_entries_lock, flags);
463 list_add(&entry->list, &free_entries);
464 num_free_entries += 1;
465 spin_unlock_irqrestore(&free_entries_lock, flags);
466}
467
FUJITA Tomonorie6a1a892009-04-15 18:22:41 +0900468int dma_debug_resize_entries(u32 num_entries)
469{
470 int i, delta, ret = 0;
471 unsigned long flags;
472 struct dma_debug_entry *entry;
473 LIST_HEAD(tmp);
474
475 spin_lock_irqsave(&free_entries_lock, flags);
476
477 if (nr_total_entries < num_entries) {
478 delta = num_entries - nr_total_entries;
479
480 spin_unlock_irqrestore(&free_entries_lock, flags);
481
482 for (i = 0; i < delta; i++) {
483 entry = kzalloc(sizeof(*entry), GFP_KERNEL);
484 if (!entry)
485 break;
486
487 list_add_tail(&entry->list, &tmp);
488 }
489
490 spin_lock_irqsave(&free_entries_lock, flags);
491
492 list_splice(&tmp, &free_entries);
493 nr_total_entries += i;
494 num_free_entries += i;
495 } else {
496 delta = nr_total_entries - num_entries;
497
498 for (i = 0; i < delta && !list_empty(&free_entries); i++) {
499 entry = __dma_entry_alloc();
500 kfree(entry);
501 }
502
503 nr_total_entries -= i;
504 }
505
506 if (nr_total_entries != num_entries)
507 ret = 1;
508
509 spin_unlock_irqrestore(&free_entries_lock, flags);
510
511 return ret;
512}
513EXPORT_SYMBOL(dma_debug_resize_entries);
514
Joerg Roedel6bf07872009-01-09 12:54:42 +0100515/*
516 * DMA-API debugging init code
517 *
518 * The init code does two things:
519 * 1. Initialize core data structures
520 * 2. Preallocate a given number of dma_debug_entry structs
521 */
522
523static int prealloc_memory(u32 num_entries)
524{
525 struct dma_debug_entry *entry, *next_entry;
526 int i;
527
528 for (i = 0; i < num_entries; ++i) {
529 entry = kzalloc(sizeof(*entry), GFP_KERNEL);
530 if (!entry)
531 goto out_err;
532
533 list_add_tail(&entry->list, &free_entries);
534 }
535
536 num_free_entries = num_entries;
537 min_free_entries = num_entries;
538
Joerg Roedele7ed70e2009-06-08 15:39:24 +0200539 pr_info("DMA-API: preallocated %d debug entries\n", num_entries);
Joerg Roedel6bf07872009-01-09 12:54:42 +0100540
541 return 0;
542
543out_err:
544
545 list_for_each_entry_safe(entry, next_entry, &free_entries, list) {
546 list_del(&entry->list);
547 kfree(entry);
548 }
549
550 return -ENOMEM;
551}
552
Joerg Roedel8a6fc702009-05-22 21:23:13 +0200553static ssize_t filter_read(struct file *file, char __user *user_buf,
554 size_t count, loff_t *ppos)
555{
Joerg Roedel8a6fc702009-05-22 21:23:13 +0200556 char buf[NAME_MAX_LEN + 1];
Joerg Roedelc17e2cf2009-06-08 15:19:29 +0200557 unsigned long flags;
Joerg Roedel8a6fc702009-05-22 21:23:13 +0200558 int len;
559
560 if (!current_driver_name[0])
561 return 0;
562
563 /*
564 * We can't copy to userspace directly because current_driver_name can
565 * only be read under the driver_name_lock with irqs disabled. So
566 * create a temporary copy first.
567 */
568 read_lock_irqsave(&driver_name_lock, flags);
569 len = scnprintf(buf, NAME_MAX_LEN + 1, "%s\n", current_driver_name);
570 read_unlock_irqrestore(&driver_name_lock, flags);
571
572 return simple_read_from_buffer(user_buf, count, ppos, buf, len);
573}
574
575static ssize_t filter_write(struct file *file, const char __user *userbuf,
576 size_t count, loff_t *ppos)
577{
Joerg Roedel8a6fc702009-05-22 21:23:13 +0200578 char buf[NAME_MAX_LEN];
Joerg Roedelc17e2cf2009-06-08 15:19:29 +0200579 unsigned long flags;
580 size_t len;
Joerg Roedel8a6fc702009-05-22 21:23:13 +0200581 int i;
582
583 /*
584 * We can't copy from userspace directly. Access to
585 * current_driver_name is protected with a write_lock with irqs
586 * disabled. Since copy_from_user can fault and may sleep we
587 * need to copy to temporary buffer first
588 */
Joerg Roedele7ed70e2009-06-08 15:39:24 +0200589 len = min(count, (size_t)(NAME_MAX_LEN - 1));
Joerg Roedel8a6fc702009-05-22 21:23:13 +0200590 if (copy_from_user(buf, userbuf, len))
591 return -EFAULT;
592
593 buf[len] = 0;
594
595 write_lock_irqsave(&driver_name_lock, flags);
596
Joerg Roedel312325092009-06-08 15:07:08 +0200597 /*
598 * Now handle the string we got from userspace very carefully.
Joerg Roedel8a6fc702009-05-22 21:23:13 +0200599 * The rules are:
600 * - only use the first token we got
601 * - token delimiter is everything looking like a space
602 * character (' ', '\n', '\t' ...)
603 *
604 */
605 if (!isalnum(buf[0])) {
606 /*
Joerg Roedel312325092009-06-08 15:07:08 +0200607 * If the first character userspace gave us is not
Joerg Roedel8a6fc702009-05-22 21:23:13 +0200608 * alphanumerical then assume the filter should be
609 * switched off.
610 */
611 if (current_driver_name[0])
Joerg Roedele7ed70e2009-06-08 15:39:24 +0200612 pr_info("DMA-API: switching off dma-debug driver filter\n");
Joerg Roedel8a6fc702009-05-22 21:23:13 +0200613 current_driver_name[0] = 0;
614 current_driver = NULL;
615 goto out_unlock;
616 }
617
618 /*
619 * Now parse out the first token and use it as the name for the
620 * driver to filter for.
621 */
Dan Carpenter39a37ce2010-04-06 19:45:12 +0300622 for (i = 0; i < NAME_MAX_LEN - 1; ++i) {
Joerg Roedel8a6fc702009-05-22 21:23:13 +0200623 current_driver_name[i] = buf[i];
624 if (isspace(buf[i]) || buf[i] == ' ' || buf[i] == 0)
625 break;
626 }
627 current_driver_name[i] = 0;
628 current_driver = NULL;
629
Joerg Roedele7ed70e2009-06-08 15:39:24 +0200630 pr_info("DMA-API: enable driver filter for driver [%s]\n",
631 current_driver_name);
Joerg Roedel8a6fc702009-05-22 21:23:13 +0200632
633out_unlock:
634 write_unlock_irqrestore(&driver_name_lock, flags);
635
636 return count;
637}
638
Thiago Farinaaeb583d2010-01-18 18:57:33 -0500639static const struct file_operations filter_fops = {
Joerg Roedel8a6fc702009-05-22 21:23:13 +0200640 .read = filter_read,
641 .write = filter_write,
Arnd Bergmann6038f372010-08-15 18:52:59 +0200642 .llseek = default_llseek,
Joerg Roedel8a6fc702009-05-22 21:23:13 +0200643};
644
Joerg Roedel788dcfa2009-01-09 13:13:27 +0100645static int dma_debug_fs_init(void)
646{
647 dma_debug_dent = debugfs_create_dir("dma-api", NULL);
648 if (!dma_debug_dent) {
Joerg Roedele7ed70e2009-06-08 15:39:24 +0200649 pr_err("DMA-API: can not create debugfs directory\n");
Joerg Roedel788dcfa2009-01-09 13:13:27 +0100650 return -ENOMEM;
651 }
652
653 global_disable_dent = debugfs_create_bool("disabled", 0444,
654 dma_debug_dent,
Dan Carpenter68ee6d22012-06-27 12:08:55 +0300655 &global_disable);
Joerg Roedel788dcfa2009-01-09 13:13:27 +0100656 if (!global_disable_dent)
657 goto out_err;
658
659 error_count_dent = debugfs_create_u32("error_count", 0444,
660 dma_debug_dent, &error_count);
661 if (!error_count_dent)
662 goto out_err;
663
664 show_all_errors_dent = debugfs_create_u32("all_errors", 0644,
665 dma_debug_dent,
666 &show_all_errors);
667 if (!show_all_errors_dent)
668 goto out_err;
669
670 show_num_errors_dent = debugfs_create_u32("num_errors", 0644,
671 dma_debug_dent,
672 &show_num_errors);
673 if (!show_num_errors_dent)
674 goto out_err;
675
676 num_free_entries_dent = debugfs_create_u32("num_free_entries", 0444,
677 dma_debug_dent,
678 &num_free_entries);
679 if (!num_free_entries_dent)
680 goto out_err;
681
682 min_free_entries_dent = debugfs_create_u32("min_free_entries", 0444,
683 dma_debug_dent,
684 &min_free_entries);
685 if (!min_free_entries_dent)
686 goto out_err;
687
Joerg Roedel8a6fc702009-05-22 21:23:13 +0200688 filter_dent = debugfs_create_file("driver_filter", 0644,
689 dma_debug_dent, NULL, &filter_fops);
690 if (!filter_dent)
691 goto out_err;
692
Joerg Roedel788dcfa2009-01-09 13:13:27 +0100693 return 0;
694
695out_err:
696 debugfs_remove_recursive(dma_debug_dent);
697
698 return -ENOMEM;
699}
700
Stanislaw Gruszkaba4b87ad2011-03-31 08:08:09 -0400701static int device_dma_allocations(struct device *dev, struct dma_debug_entry **out_entry)
Joerg Roedeled888ae2009-05-22 17:16:04 +0200702{
703 struct dma_debug_entry *entry;
704 unsigned long flags;
705 int count = 0, i;
706
Joerg Roedelbe81c6e2009-06-08 15:46:19 +0200707 local_irq_save(flags);
708
Joerg Roedeled888ae2009-05-22 17:16:04 +0200709 for (i = 0; i < HASH_SIZE; ++i) {
Joerg Roedelbe81c6e2009-06-08 15:46:19 +0200710 spin_lock(&dma_entry_hash[i].lock);
Joerg Roedeled888ae2009-05-22 17:16:04 +0200711 list_for_each_entry(entry, &dma_entry_hash[i].list, list) {
Stanislaw Gruszkaba4b87ad2011-03-31 08:08:09 -0400712 if (entry->dev == dev) {
Joerg Roedeled888ae2009-05-22 17:16:04 +0200713 count += 1;
Stanislaw Gruszkaba4b87ad2011-03-31 08:08:09 -0400714 *out_entry = entry;
715 }
Joerg Roedeled888ae2009-05-22 17:16:04 +0200716 }
Joerg Roedelbe81c6e2009-06-08 15:46:19 +0200717 spin_unlock(&dma_entry_hash[i].lock);
Joerg Roedeled888ae2009-05-22 17:16:04 +0200718 }
719
Joerg Roedelbe81c6e2009-06-08 15:46:19 +0200720 local_irq_restore(flags);
721
Joerg Roedeled888ae2009-05-22 17:16:04 +0200722 return count;
723}
724
Ingo Molnara8fe9ea2009-12-31 15:16:23 +0100725static int dma_debug_device_change(struct notifier_block *nb, unsigned long action, void *data)
Joerg Roedeled888ae2009-05-22 17:16:04 +0200726{
727 struct device *dev = data;
Stanislaw Gruszkaba4b87ad2011-03-31 08:08:09 -0400728 struct dma_debug_entry *uninitialized_var(entry);
Joerg Roedeled888ae2009-05-22 17:16:04 +0200729 int count;
730
Shaun Ruffellf797d982009-12-17 18:00:36 -0600731 if (global_disable)
Ingo Molnara8fe9ea2009-12-31 15:16:23 +0100732 return 0;
Joerg Roedeled888ae2009-05-22 17:16:04 +0200733
734 switch (action) {
735 case BUS_NOTIFY_UNBOUND_DRIVER:
Stanislaw Gruszkaba4b87ad2011-03-31 08:08:09 -0400736 count = device_dma_allocations(dev, &entry);
Joerg Roedeled888ae2009-05-22 17:16:04 +0200737 if (count == 0)
738 break;
Stanislaw Gruszkaba4b87ad2011-03-31 08:08:09 -0400739 err_printk(dev, entry, "DMA-API: device driver has pending "
Joerg Roedeled888ae2009-05-22 17:16:04 +0200740 "DMA allocations while released from device "
Stanislaw Gruszkaba4b87ad2011-03-31 08:08:09 -0400741 "[count=%d]\n"
742 "One of leaked entries details: "
743 "[device address=0x%016llx] [size=%llu bytes] "
744 "[mapped with %s] [mapped as %s]\n",
745 count, entry->dev_addr, entry->size,
746 dir2name[entry->direction], type2name[entry->type]);
Joerg Roedeled888ae2009-05-22 17:16:04 +0200747 break;
748 default:
749 break;
750 }
751
752 return 0;
753}
754
Joerg Roedel41531c82009-03-16 17:32:14 +0100755void dma_debug_add_bus(struct bus_type *bus)
756{
Joerg Roedeled888ae2009-05-22 17:16:04 +0200757 struct notifier_block *nb;
758
Shaun Ruffellf797d982009-12-17 18:00:36 -0600759 if (global_disable)
760 return;
761
Joerg Roedeled888ae2009-05-22 17:16:04 +0200762 nb = kzalloc(sizeof(struct notifier_block), GFP_KERNEL);
763 if (nb == NULL) {
Joerg Roedele7ed70e2009-06-08 15:39:24 +0200764 pr_err("dma_debug_add_bus: out of memory\n");
Joerg Roedeled888ae2009-05-22 17:16:04 +0200765 return;
766 }
767
768 nb->notifier_call = dma_debug_device_change;
769
770 bus_register_notifier(bus, nb);
Joerg Roedel41531c82009-03-16 17:32:14 +0100771}
Joerg Roedel788dcfa2009-01-09 13:13:27 +0100772
Joerg Roedel6bf07872009-01-09 12:54:42 +0100773/*
774 * Let the architectures decide how many entries should be preallocated.
775 */
776void dma_debug_init(u32 num_entries)
777{
778 int i;
779
780 if (global_disable)
781 return;
782
783 for (i = 0; i < HASH_SIZE; ++i) {
784 INIT_LIST_HEAD(&dma_entry_hash[i].list);
Ingo Molnarb0a5b832009-06-16 16:11:14 +0200785 spin_lock_init(&dma_entry_hash[i].lock);
Joerg Roedel6bf07872009-01-09 12:54:42 +0100786 }
787
Joerg Roedel788dcfa2009-01-09 13:13:27 +0100788 if (dma_debug_fs_init() != 0) {
Joerg Roedele7ed70e2009-06-08 15:39:24 +0200789 pr_err("DMA-API: error creating debugfs entries - disabling\n");
Joerg Roedel788dcfa2009-01-09 13:13:27 +0100790 global_disable = true;
791
792 return;
793 }
794
Joerg Roedel59d3daa2009-01-09 13:01:56 +0100795 if (req_entries)
796 num_entries = req_entries;
797
Joerg Roedel6bf07872009-01-09 12:54:42 +0100798 if (prealloc_memory(num_entries) != 0) {
Joerg Roedele7ed70e2009-06-08 15:39:24 +0200799 pr_err("DMA-API: debugging out of memory error - disabled\n");
Joerg Roedel6bf07872009-01-09 12:54:42 +0100800 global_disable = true;
801
802 return;
803 }
804
FUJITA Tomonorie6a1a892009-04-15 18:22:41 +0900805 nr_total_entries = num_free_entries;
806
Joerg Roedele7ed70e2009-06-08 15:39:24 +0200807 pr_info("DMA-API: debugging enabled by kernel config\n");
Joerg Roedel6bf07872009-01-09 12:54:42 +0100808}
809
Joerg Roedel59d3daa2009-01-09 13:01:56 +0100810static __init int dma_debug_cmdline(char *str)
811{
812 if (!str)
813 return -EINVAL;
814
815 if (strncmp(str, "off", 3) == 0) {
Joerg Roedele7ed70e2009-06-08 15:39:24 +0200816 pr_info("DMA-API: debugging disabled on kernel command line\n");
Joerg Roedel59d3daa2009-01-09 13:01:56 +0100817 global_disable = true;
818 }
819
820 return 0;
821}
822
823static __init int dma_debug_entries_cmdline(char *str)
824{
825 int res;
826
827 if (!str)
828 return -EINVAL;
829
830 res = get_option(&str, &req_entries);
831
832 if (!res)
833 req_entries = 0;
834
835 return 0;
836}
837
838__setup("dma_debug=", dma_debug_cmdline);
839__setup("dma_debug_entries=", dma_debug_entries_cmdline);
840
Joerg Roedel2d62ece2009-01-09 14:10:26 +0100841static void check_unmap(struct dma_debug_entry *ref)
842{
843 struct dma_debug_entry *entry;
844 struct hash_bucket *bucket;
845 unsigned long flags;
846
FUJITA Tomonori35d40952009-03-19 10:39:31 +0900847 if (dma_mapping_error(ref->dev, ref->dev_addr)) {
848 err_printk(ref->dev, NULL, "DMA-API: device driver tries "
849 "to free an invalid DMA memory address\n");
Joerg Roedel2d62ece2009-01-09 14:10:26 +0100850 return;
FUJITA Tomonori35d40952009-03-19 10:39:31 +0900851 }
Joerg Roedel2d62ece2009-01-09 14:10:26 +0100852
853 bucket = get_hash_bucket(ref, &flags);
Neil Hormanc6a21d02011-08-08 15:13:54 -0400854 entry = bucket_find_exact(bucket, ref);
Joerg Roedel2d62ece2009-01-09 14:10:26 +0100855
856 if (!entry) {
David Woodhouse6c132d12009-01-19 16:52:39 +0100857 err_printk(ref->dev, NULL, "DMA-API: device driver tries "
Joerg Roedel2d62ece2009-01-09 14:10:26 +0100858 "to free DMA memory it has not allocated "
859 "[device address=0x%016llx] [size=%llu bytes]\n",
860 ref->dev_addr, ref->size);
861 goto out;
862 }
863
864 if (ref->size != entry->size) {
David Woodhouse6c132d12009-01-19 16:52:39 +0100865 err_printk(ref->dev, entry, "DMA-API: device driver frees "
Joerg Roedel2d62ece2009-01-09 14:10:26 +0100866 "DMA memory with different size "
867 "[device address=0x%016llx] [map size=%llu bytes] "
868 "[unmap size=%llu bytes]\n",
869 ref->dev_addr, entry->size, ref->size);
870 }
871
872 if (ref->type != entry->type) {
David Woodhouse6c132d12009-01-19 16:52:39 +0100873 err_printk(ref->dev, entry, "DMA-API: device driver frees "
Joerg Roedel2d62ece2009-01-09 14:10:26 +0100874 "DMA memory with wrong function "
875 "[device address=0x%016llx] [size=%llu bytes] "
876 "[mapped as %s] [unmapped as %s]\n",
877 ref->dev_addr, ref->size,
878 type2name[entry->type], type2name[ref->type]);
879 } else if ((entry->type == dma_debug_coherent) &&
880 (ref->paddr != entry->paddr)) {
David Woodhouse6c132d12009-01-19 16:52:39 +0100881 err_printk(ref->dev, entry, "DMA-API: device driver frees "
Joerg Roedel2d62ece2009-01-09 14:10:26 +0100882 "DMA memory with different CPU address "
883 "[device address=0x%016llx] [size=%llu bytes] "
Joerg Roedel59a40e702009-10-29 16:25:50 +0100884 "[cpu alloc address=0x%016llx] "
885 "[cpu free address=0x%016llx]",
Joerg Roedel2d62ece2009-01-09 14:10:26 +0100886 ref->dev_addr, ref->size,
Joerg Roedel59a40e702009-10-29 16:25:50 +0100887 (unsigned long long)entry->paddr,
888 (unsigned long long)ref->paddr);
Joerg Roedel2d62ece2009-01-09 14:10:26 +0100889 }
890
891 if (ref->sg_call_ents && ref->type == dma_debug_sg &&
892 ref->sg_call_ents != entry->sg_call_ents) {
David Woodhouse6c132d12009-01-19 16:52:39 +0100893 err_printk(ref->dev, entry, "DMA-API: device driver frees "
Joerg Roedel2d62ece2009-01-09 14:10:26 +0100894 "DMA sg list with different entry count "
895 "[map count=%d] [unmap count=%d]\n",
896 entry->sg_call_ents, ref->sg_call_ents);
897 }
898
899 /*
900 * This may be no bug in reality - but most implementations of the
901 * DMA API don't handle this properly, so check for it here
902 */
903 if (ref->direction != entry->direction) {
David Woodhouse6c132d12009-01-19 16:52:39 +0100904 err_printk(ref->dev, entry, "DMA-API: device driver frees "
Joerg Roedel2d62ece2009-01-09 14:10:26 +0100905 "DMA memory with different direction "
906 "[device address=0x%016llx] [size=%llu bytes] "
907 "[mapped with %s] [unmapped with %s]\n",
908 ref->dev_addr, ref->size,
909 dir2name[entry->direction],
910 dir2name[ref->direction]);
911 }
912
913 hash_bucket_del(entry);
914 dma_entry_free(entry);
915
916out:
917 put_hash_bucket(bucket, &flags);
918}
919
920static void check_for_stack(struct device *dev, void *addr)
921{
922 if (object_is_on_stack(addr))
David Woodhouse6c132d12009-01-19 16:52:39 +0100923 err_printk(dev, NULL, "DMA-API: device driver maps memory from"
924 "stack [addr=%p]\n", addr);
Joerg Roedel2d62ece2009-01-09 14:10:26 +0100925}
926
Ingo Molnarf39d1b92009-07-10 21:38:02 +0200927static inline bool overlap(void *addr, unsigned long len, void *start, void *end)
Joerg Roedel2e34bde2009-03-16 16:51:55 +0100928{
Ingo Molnarf39d1b92009-07-10 21:38:02 +0200929 unsigned long a1 = (unsigned long)addr;
930 unsigned long b1 = a1 + len;
931 unsigned long a2 = (unsigned long)start;
932 unsigned long b2 = (unsigned long)end;
Joerg Roedel2e34bde2009-03-16 16:51:55 +0100933
Ingo Molnarf39d1b92009-07-10 21:38:02 +0200934 return !(b1 <= a2 || a1 >= b2);
Joerg Roedel2e34bde2009-03-16 16:51:55 +0100935}
936
Ingo Molnarf39d1b92009-07-10 21:38:02 +0200937static void check_for_illegal_area(struct device *dev, void *addr, unsigned long len)
Joerg Roedel2e34bde2009-03-16 16:51:55 +0100938{
Ingo Molnarf39d1b92009-07-10 21:38:02 +0200939 if (overlap(addr, len, _text, _etext) ||
940 overlap(addr, len, __start_rodata, __end_rodata))
941 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 +0100942}
943
Joerg Roedelaa010ef2009-06-12 15:25:06 +0200944static void check_sync(struct device *dev,
945 struct dma_debug_entry *ref,
946 bool to_cpu)
Joerg Roedel2d62ece2009-01-09 14:10:26 +0100947{
Joerg Roedel2d62ece2009-01-09 14:10:26 +0100948 struct dma_debug_entry *entry;
949 struct hash_bucket *bucket;
950 unsigned long flags;
951
Joerg Roedelaa010ef2009-06-12 15:25:06 +0200952 bucket = get_hash_bucket(ref, &flags);
Joerg Roedel2d62ece2009-01-09 14:10:26 +0100953
Neil Hormanc6a21d02011-08-08 15:13:54 -0400954 entry = bucket_find_contain(&bucket, ref, &flags);
Joerg Roedel2d62ece2009-01-09 14:10:26 +0100955
956 if (!entry) {
David Woodhouse6c132d12009-01-19 16:52:39 +0100957 err_printk(dev, NULL, "DMA-API: device driver tries "
Joerg Roedel2d62ece2009-01-09 14:10:26 +0100958 "to sync DMA memory it has not allocated "
959 "[device address=0x%016llx] [size=%llu bytes]\n",
Joerg Roedelaa010ef2009-06-12 15:25:06 +0200960 (unsigned long long)ref->dev_addr, ref->size);
Joerg Roedel2d62ece2009-01-09 14:10:26 +0100961 goto out;
962 }
963
Joerg Roedelaa010ef2009-06-12 15:25:06 +0200964 if (ref->size > entry->size) {
David Woodhouse6c132d12009-01-19 16:52:39 +0100965 err_printk(dev, entry, "DMA-API: device driver syncs"
Joerg Roedel2d62ece2009-01-09 14:10:26 +0100966 " DMA memory outside allocated range "
967 "[device address=0x%016llx] "
Joerg Roedelaa010ef2009-06-12 15:25:06 +0200968 "[allocation size=%llu bytes] "
969 "[sync offset+size=%llu]\n",
970 entry->dev_addr, entry->size,
971 ref->size);
Joerg Roedel2d62ece2009-01-09 14:10:26 +0100972 }
973
Krzysztof Halasa42d53b42010-01-08 14:42:36 -0800974 if (entry->direction == DMA_BIDIRECTIONAL)
975 goto out;
976
Joerg Roedelaa010ef2009-06-12 15:25:06 +0200977 if (ref->direction != entry->direction) {
David Woodhouse6c132d12009-01-19 16:52:39 +0100978 err_printk(dev, entry, "DMA-API: device driver syncs "
Joerg Roedel2d62ece2009-01-09 14:10:26 +0100979 "DMA memory with different direction "
980 "[device address=0x%016llx] [size=%llu bytes] "
981 "[mapped with %s] [synced with %s]\n",
Joerg Roedelaa010ef2009-06-12 15:25:06 +0200982 (unsigned long long)ref->dev_addr, entry->size,
Joerg Roedel2d62ece2009-01-09 14:10:26 +0100983 dir2name[entry->direction],
Joerg Roedelaa010ef2009-06-12 15:25:06 +0200984 dir2name[ref->direction]);
Joerg Roedel2d62ece2009-01-09 14:10:26 +0100985 }
986
Joerg Roedel2d62ece2009-01-09 14:10:26 +0100987 if (to_cpu && !(entry->direction == DMA_FROM_DEVICE) &&
Joerg Roedelaa010ef2009-06-12 15:25:06 +0200988 !(ref->direction == DMA_TO_DEVICE))
David Woodhouse6c132d12009-01-19 16:52:39 +0100989 err_printk(dev, entry, "DMA-API: device driver syncs "
Joerg Roedel2d62ece2009-01-09 14:10:26 +0100990 "device read-only DMA memory for cpu "
991 "[device address=0x%016llx] [size=%llu bytes] "
992 "[mapped with %s] [synced with %s]\n",
Joerg Roedelaa010ef2009-06-12 15:25:06 +0200993 (unsigned long long)ref->dev_addr, entry->size,
Joerg Roedel2d62ece2009-01-09 14:10:26 +0100994 dir2name[entry->direction],
Joerg Roedelaa010ef2009-06-12 15:25:06 +0200995 dir2name[ref->direction]);
Joerg Roedel2d62ece2009-01-09 14:10:26 +0100996
997 if (!to_cpu && !(entry->direction == DMA_TO_DEVICE) &&
Joerg Roedelaa010ef2009-06-12 15:25:06 +0200998 !(ref->direction == DMA_FROM_DEVICE))
David Woodhouse6c132d12009-01-19 16:52:39 +0100999 err_printk(dev, entry, "DMA-API: device driver syncs "
Joerg Roedel2d62ece2009-01-09 14:10:26 +01001000 "device write-only DMA memory to device "
1001 "[device address=0x%016llx] [size=%llu bytes] "
1002 "[mapped with %s] [synced with %s]\n",
Joerg Roedelaa010ef2009-06-12 15:25:06 +02001003 (unsigned long long)ref->dev_addr, entry->size,
Joerg Roedel2d62ece2009-01-09 14:10:26 +01001004 dir2name[entry->direction],
Joerg Roedelaa010ef2009-06-12 15:25:06 +02001005 dir2name[ref->direction]);
Joerg Roedel2d62ece2009-01-09 14:10:26 +01001006
1007out:
1008 put_hash_bucket(bucket, &flags);
Joerg Roedel2d62ece2009-01-09 14:10:26 +01001009}
1010
Joerg Roedelf62bc982009-01-09 14:14:49 +01001011void debug_dma_map_page(struct device *dev, struct page *page, size_t offset,
1012 size_t size, int direction, dma_addr_t dma_addr,
1013 bool map_single)
1014{
1015 struct dma_debug_entry *entry;
1016
1017 if (unlikely(global_disable))
1018 return;
1019
1020 if (unlikely(dma_mapping_error(dev, dma_addr)))
1021 return;
1022
1023 entry = dma_entry_alloc();
1024 if (!entry)
1025 return;
1026
1027 entry->dev = dev;
1028 entry->type = dma_debug_page;
1029 entry->paddr = page_to_phys(page) + offset;
1030 entry->dev_addr = dma_addr;
1031 entry->size = size;
1032 entry->direction = direction;
1033
Joerg Roedel9537a482009-03-23 15:35:08 +01001034 if (map_single)
Joerg Roedelf62bc982009-01-09 14:14:49 +01001035 entry->type = dma_debug_single;
Joerg Roedel9537a482009-03-23 15:35:08 +01001036
1037 if (!PageHighMem(page)) {
Ingo Molnarf39d1b92009-07-10 21:38:02 +02001038 void *addr = page_address(page) + offset;
1039
Joerg Roedel2e34bde2009-03-16 16:51:55 +01001040 check_for_stack(dev, addr);
1041 check_for_illegal_area(dev, addr, size);
Joerg Roedelf62bc982009-01-09 14:14:49 +01001042 }
1043
1044 add_dma_entry(entry);
1045}
1046EXPORT_SYMBOL(debug_dma_map_page);
1047
1048void debug_dma_unmap_page(struct device *dev, dma_addr_t addr,
1049 size_t size, int direction, bool map_single)
1050{
1051 struct dma_debug_entry ref = {
1052 .type = dma_debug_page,
1053 .dev = dev,
1054 .dev_addr = addr,
1055 .size = size,
1056 .direction = direction,
1057 };
1058
1059 if (unlikely(global_disable))
1060 return;
1061
1062 if (map_single)
1063 ref.type = dma_debug_single;
1064
1065 check_unmap(&ref);
1066}
1067EXPORT_SYMBOL(debug_dma_unmap_page);
1068
Joerg Roedel972aa452009-01-09 14:19:54 +01001069void debug_dma_map_sg(struct device *dev, struct scatterlist *sg,
1070 int nents, int mapped_ents, int direction)
1071{
1072 struct dma_debug_entry *entry;
1073 struct scatterlist *s;
1074 int i;
1075
1076 if (unlikely(global_disable))
1077 return;
1078
1079 for_each_sg(sg, s, mapped_ents, i) {
1080 entry = dma_entry_alloc();
1081 if (!entry)
1082 return;
1083
1084 entry->type = dma_debug_sg;
1085 entry->dev = dev;
1086 entry->paddr = sg_phys(s);
FUJITA Tomonori884d0592009-05-27 09:43:02 +09001087 entry->size = sg_dma_len(s);
FUJITA Tomonori15aedea42009-05-27 09:43:01 +09001088 entry->dev_addr = sg_dma_address(s);
Joerg Roedel972aa452009-01-09 14:19:54 +01001089 entry->direction = direction;
1090 entry->sg_call_ents = nents;
1091 entry->sg_mapped_ents = mapped_ents;
1092
Joerg Roedel9537a482009-03-23 15:35:08 +01001093 if (!PageHighMem(sg_page(s))) {
1094 check_for_stack(dev, sg_virt(s));
FUJITA Tomonori884d0592009-05-27 09:43:02 +09001095 check_for_illegal_area(dev, sg_virt(s), sg_dma_len(s));
Joerg Roedel9537a482009-03-23 15:35:08 +01001096 }
Joerg Roedel972aa452009-01-09 14:19:54 +01001097
1098 add_dma_entry(entry);
1099 }
1100}
1101EXPORT_SYMBOL(debug_dma_map_sg);
1102
Joerg Roedelaa010ef2009-06-12 15:25:06 +02001103static int get_nr_mapped_entries(struct device *dev,
1104 struct dma_debug_entry *ref)
FUJITA Tomonori88f39072009-05-27 09:43:03 +09001105{
Joerg Roedelaa010ef2009-06-12 15:25:06 +02001106 struct dma_debug_entry *entry;
FUJITA Tomonori88f39072009-05-27 09:43:03 +09001107 struct hash_bucket *bucket;
1108 unsigned long flags;
Joerg Roedelc17e2cf2009-06-08 15:19:29 +02001109 int mapped_ents;
FUJITA Tomonori88f39072009-05-27 09:43:03 +09001110
Joerg Roedelaa010ef2009-06-12 15:25:06 +02001111 bucket = get_hash_bucket(ref, &flags);
Neil Hormanc6a21d02011-08-08 15:13:54 -04001112 entry = bucket_find_exact(bucket, ref);
Joerg Roedelc17e2cf2009-06-08 15:19:29 +02001113 mapped_ents = 0;
1114
FUJITA Tomonori88f39072009-05-27 09:43:03 +09001115 if (entry)
1116 mapped_ents = entry->sg_mapped_ents;
1117 put_hash_bucket(bucket, &flags);
1118
1119 return mapped_ents;
1120}
1121
Joerg Roedel972aa452009-01-09 14:19:54 +01001122void debug_dma_unmap_sg(struct device *dev, struct scatterlist *sglist,
1123 int nelems, int dir)
1124{
Joerg Roedel972aa452009-01-09 14:19:54 +01001125 struct scatterlist *s;
1126 int mapped_ents = 0, i;
Joerg Roedel972aa452009-01-09 14:19:54 +01001127
1128 if (unlikely(global_disable))
1129 return;
1130
1131 for_each_sg(sglist, s, nelems, i) {
1132
1133 struct dma_debug_entry ref = {
1134 .type = dma_debug_sg,
1135 .dev = dev,
1136 .paddr = sg_phys(s),
FUJITA Tomonori15aedea42009-05-27 09:43:01 +09001137 .dev_addr = sg_dma_address(s),
FUJITA Tomonori884d0592009-05-27 09:43:02 +09001138 .size = sg_dma_len(s),
Joerg Roedel972aa452009-01-09 14:19:54 +01001139 .direction = dir,
Joerg Roedele5e8c5b2009-06-11 10:03:42 +02001140 .sg_call_ents = nelems,
Joerg Roedel972aa452009-01-09 14:19:54 +01001141 };
1142
1143 if (mapped_ents && i >= mapped_ents)
1144 break;
1145
Joerg Roedele5e8c5b2009-06-11 10:03:42 +02001146 if (!i)
Joerg Roedelaa010ef2009-06-12 15:25:06 +02001147 mapped_ents = get_nr_mapped_entries(dev, &ref);
Joerg Roedel972aa452009-01-09 14:19:54 +01001148
1149 check_unmap(&ref);
1150 }
1151}
1152EXPORT_SYMBOL(debug_dma_unmap_sg);
1153
Joerg Roedel6bfd4492009-01-09 14:38:50 +01001154void debug_dma_alloc_coherent(struct device *dev, size_t size,
1155 dma_addr_t dma_addr, void *virt)
1156{
1157 struct dma_debug_entry *entry;
1158
1159 if (unlikely(global_disable))
1160 return;
1161
1162 if (unlikely(virt == NULL))
1163 return;
1164
1165 entry = dma_entry_alloc();
1166 if (!entry)
1167 return;
1168
1169 entry->type = dma_debug_coherent;
1170 entry->dev = dev;
1171 entry->paddr = virt_to_phys(virt);
1172 entry->size = size;
1173 entry->dev_addr = dma_addr;
1174 entry->direction = DMA_BIDIRECTIONAL;
1175
1176 add_dma_entry(entry);
1177}
1178EXPORT_SYMBOL(debug_dma_alloc_coherent);
1179
1180void debug_dma_free_coherent(struct device *dev, size_t size,
1181 void *virt, dma_addr_t addr)
1182{
1183 struct dma_debug_entry ref = {
1184 .type = dma_debug_coherent,
1185 .dev = dev,
1186 .paddr = virt_to_phys(virt),
1187 .dev_addr = addr,
1188 .size = size,
1189 .direction = DMA_BIDIRECTIONAL,
1190 };
1191
1192 if (unlikely(global_disable))
1193 return;
1194
1195 check_unmap(&ref);
1196}
1197EXPORT_SYMBOL(debug_dma_free_coherent);
1198
Joerg Roedelb9d23172009-01-09 14:43:04 +01001199void debug_dma_sync_single_for_cpu(struct device *dev, dma_addr_t dma_handle,
1200 size_t size, int direction)
1201{
Joerg Roedelaa010ef2009-06-12 15:25:06 +02001202 struct dma_debug_entry ref;
1203
Joerg Roedelb9d23172009-01-09 14:43:04 +01001204 if (unlikely(global_disable))
1205 return;
1206
Joerg Roedelaa010ef2009-06-12 15:25:06 +02001207 ref.type = dma_debug_single;
1208 ref.dev = dev;
1209 ref.dev_addr = dma_handle;
1210 ref.size = size;
1211 ref.direction = direction;
1212 ref.sg_call_ents = 0;
1213
1214 check_sync(dev, &ref, true);
Joerg Roedelb9d23172009-01-09 14:43:04 +01001215}
1216EXPORT_SYMBOL(debug_dma_sync_single_for_cpu);
1217
1218void debug_dma_sync_single_for_device(struct device *dev,
1219 dma_addr_t dma_handle, size_t size,
1220 int direction)
1221{
Joerg Roedelaa010ef2009-06-12 15:25:06 +02001222 struct dma_debug_entry ref;
1223
Joerg Roedelb9d23172009-01-09 14:43:04 +01001224 if (unlikely(global_disable))
1225 return;
1226
Joerg Roedelaa010ef2009-06-12 15:25:06 +02001227 ref.type = dma_debug_single;
1228 ref.dev = dev;
1229 ref.dev_addr = dma_handle;
1230 ref.size = size;
1231 ref.direction = direction;
1232 ref.sg_call_ents = 0;
1233
1234 check_sync(dev, &ref, false);
Joerg Roedelb9d23172009-01-09 14:43:04 +01001235}
1236EXPORT_SYMBOL(debug_dma_sync_single_for_device);
1237
Joerg Roedel948408b2009-01-09 14:55:38 +01001238void debug_dma_sync_single_range_for_cpu(struct device *dev,
1239 dma_addr_t dma_handle,
1240 unsigned long offset, size_t size,
1241 int direction)
1242{
Joerg Roedelaa010ef2009-06-12 15:25:06 +02001243 struct dma_debug_entry ref;
1244
Joerg Roedel948408b2009-01-09 14:55:38 +01001245 if (unlikely(global_disable))
1246 return;
1247
Joerg Roedelaa010ef2009-06-12 15:25:06 +02001248 ref.type = dma_debug_single;
1249 ref.dev = dev;
1250 ref.dev_addr = dma_handle;
1251 ref.size = offset + size;
1252 ref.direction = direction;
1253 ref.sg_call_ents = 0;
1254
1255 check_sync(dev, &ref, true);
Joerg Roedel948408b2009-01-09 14:55:38 +01001256}
1257EXPORT_SYMBOL(debug_dma_sync_single_range_for_cpu);
1258
1259void debug_dma_sync_single_range_for_device(struct device *dev,
1260 dma_addr_t dma_handle,
1261 unsigned long offset,
1262 size_t size, int direction)
1263{
Joerg Roedelaa010ef2009-06-12 15:25:06 +02001264 struct dma_debug_entry ref;
1265
Joerg Roedel948408b2009-01-09 14:55:38 +01001266 if (unlikely(global_disable))
1267 return;
1268
Joerg Roedelaa010ef2009-06-12 15:25:06 +02001269 ref.type = dma_debug_single;
1270 ref.dev = dev;
1271 ref.dev_addr = dma_handle;
1272 ref.size = offset + size;
1273 ref.direction = direction;
1274 ref.sg_call_ents = 0;
1275
1276 check_sync(dev, &ref, false);
Joerg Roedel948408b2009-01-09 14:55:38 +01001277}
1278EXPORT_SYMBOL(debug_dma_sync_single_range_for_device);
1279
Joerg Roedela31fba52009-01-09 15:01:12 +01001280void debug_dma_sync_sg_for_cpu(struct device *dev, struct scatterlist *sg,
1281 int nelems, int direction)
1282{
1283 struct scatterlist *s;
FUJITA Tomonori88f39072009-05-27 09:43:03 +09001284 int mapped_ents = 0, i;
Joerg Roedela31fba52009-01-09 15:01:12 +01001285
1286 if (unlikely(global_disable))
1287 return;
1288
1289 for_each_sg(sg, s, nelems, i) {
Joerg Roedelaa010ef2009-06-12 15:25:06 +02001290
1291 struct dma_debug_entry ref = {
1292 .type = dma_debug_sg,
1293 .dev = dev,
1294 .paddr = sg_phys(s),
1295 .dev_addr = sg_dma_address(s),
1296 .size = sg_dma_len(s),
1297 .direction = direction,
1298 .sg_call_ents = nelems,
1299 };
1300
FUJITA Tomonori88f39072009-05-27 09:43:03 +09001301 if (!i)
Joerg Roedelaa010ef2009-06-12 15:25:06 +02001302 mapped_ents = get_nr_mapped_entries(dev, &ref);
FUJITA Tomonori88f39072009-05-27 09:43:03 +09001303
1304 if (i >= mapped_ents)
1305 break;
1306
Joerg Roedelaa010ef2009-06-12 15:25:06 +02001307 check_sync(dev, &ref, true);
Joerg Roedela31fba52009-01-09 15:01:12 +01001308 }
1309}
1310EXPORT_SYMBOL(debug_dma_sync_sg_for_cpu);
1311
1312void debug_dma_sync_sg_for_device(struct device *dev, struct scatterlist *sg,
1313 int nelems, int direction)
1314{
1315 struct scatterlist *s;
FUJITA Tomonori88f39072009-05-27 09:43:03 +09001316 int mapped_ents = 0, i;
Joerg Roedela31fba52009-01-09 15:01:12 +01001317
1318 if (unlikely(global_disable))
1319 return;
1320
1321 for_each_sg(sg, s, nelems, i) {
Joerg Roedelaa010ef2009-06-12 15:25:06 +02001322
1323 struct dma_debug_entry ref = {
1324 .type = dma_debug_sg,
1325 .dev = dev,
1326 .paddr = sg_phys(s),
1327 .dev_addr = sg_dma_address(s),
1328 .size = sg_dma_len(s),
1329 .direction = direction,
1330 .sg_call_ents = nelems,
1331 };
FUJITA Tomonori88f39072009-05-27 09:43:03 +09001332 if (!i)
Joerg Roedelaa010ef2009-06-12 15:25:06 +02001333 mapped_ents = get_nr_mapped_entries(dev, &ref);
FUJITA Tomonori88f39072009-05-27 09:43:03 +09001334
1335 if (i >= mapped_ents)
1336 break;
1337
Joerg Roedelaa010ef2009-06-12 15:25:06 +02001338 check_sync(dev, &ref, false);
Joerg Roedela31fba52009-01-09 15:01:12 +01001339 }
1340}
1341EXPORT_SYMBOL(debug_dma_sync_sg_for_device);
1342
Joerg Roedel1745de52009-05-22 21:49:51 +02001343static int __init dma_debug_driver_setup(char *str)
1344{
1345 int i;
1346
1347 for (i = 0; i < NAME_MAX_LEN - 1; ++i, ++str) {
1348 current_driver_name[i] = *str;
1349 if (*str == 0)
1350 break;
1351 }
1352
1353 if (current_driver_name[0])
Joerg Roedele7ed70e2009-06-08 15:39:24 +02001354 pr_info("DMA-API: enable driver filter for driver [%s]\n",
1355 current_driver_name);
Joerg Roedel1745de52009-05-22 21:49:51 +02001356
1357
1358 return 1;
1359}
1360__setup("dma_debug_driver=", dma_debug_driver_setup);