blob: 2defd1308b045c46389a6232391999914573deb6 [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
Shuah Khan6c9c6d62012-10-08 11:08:06 -060048enum map_err_types {
49 MAP_ERR_CHECK_NOT_APPLICABLE,
50 MAP_ERR_NOT_CHECKED,
51 MAP_ERR_CHECKED,
52};
53
David Woodhouse6c132d12009-01-19 16:52:39 +010054#define DMA_DEBUG_STACKTRACE_ENTRIES 5
55
Dan Williams0abdd7a2014-01-21 15:48:12 -080056/**
57 * struct dma_debug_entry - track a dma_map* or dma_alloc_coherent mapping
58 * @list: node on pre-allocated free_entries list
59 * @dev: 'dev' argument to dma_map_{page|single|sg} or dma_alloc_coherent
60 * @type: single, page, sg, coherent
61 * @pfn: page frame of the start address
62 * @offset: offset of mapping relative to pfn
63 * @size: length of the mapping
64 * @direction: enum dma_data_direction
65 * @sg_call_ents: 'nents' from dma_map_sg
66 * @sg_mapped_ents: 'mapped_ents' from dma_map_sg
67 * @map_err_type: track whether dma_mapping_error() was checked
68 * @stacktrace: support backtraces when a violation is detected
69 */
Joerg Roedelf2f45e52009-01-09 12:19:52 +010070struct dma_debug_entry {
71 struct list_head list;
72 struct device *dev;
73 int type;
Dan Williams0abdd7a2014-01-21 15:48:12 -080074 unsigned long pfn;
75 size_t offset;
Joerg Roedelf2f45e52009-01-09 12:19:52 +010076 u64 dev_addr;
77 u64 size;
78 int direction;
79 int sg_call_ents;
80 int sg_mapped_ents;
Shuah Khan6c9c6d62012-10-08 11:08:06 -060081 enum map_err_types map_err_type;
David Woodhouse6c132d12009-01-19 16:52:39 +010082#ifdef CONFIG_STACKTRACE
83 struct stack_trace stacktrace;
84 unsigned long st_entries[DMA_DEBUG_STACKTRACE_ENTRIES];
85#endif
Joerg Roedelf2f45e52009-01-09 12:19:52 +010086};
87
Neil Hormanc6a21d02011-08-08 15:13:54 -040088typedef bool (*match_fn)(struct dma_debug_entry *, struct dma_debug_entry *);
89
Joerg Roedel30dfa902009-01-09 12:34:49 +010090struct hash_bucket {
91 struct list_head list;
92 spinlock_t lock;
Joerg Roedel2d62ece2009-01-09 14:10:26 +010093} ____cacheline_aligned_in_smp;
Joerg Roedel30dfa902009-01-09 12:34:49 +010094
95/* Hash list to save the allocated dma addresses */
96static struct hash_bucket dma_entry_hash[HASH_SIZE];
Joerg Roedel3b1e79e2009-01-09 12:42:46 +010097/* List of pre-allocated dma_debug_entry's */
98static LIST_HEAD(free_entries);
99/* Lock for the list above */
100static DEFINE_SPINLOCK(free_entries_lock);
101
102/* Global disable flag - will be set in case of an error */
Dan Carpenter68ee6d22012-06-27 12:08:55 +0300103static u32 global_disable __read_mostly;
Joerg Roedel3b1e79e2009-01-09 12:42:46 +0100104
Joerg Roedel788dcfa2009-01-09 13:13:27 +0100105/* Global error count */
106static u32 error_count;
107
108/* Global error show enable*/
109static u32 show_all_errors __read_mostly;
110/* Number of errors to show */
111static u32 show_num_errors = 1;
112
Joerg Roedel3b1e79e2009-01-09 12:42:46 +0100113static u32 num_free_entries;
114static u32 min_free_entries;
FUJITA Tomonorie6a1a892009-04-15 18:22:41 +0900115static u32 nr_total_entries;
Joerg Roedel30dfa902009-01-09 12:34:49 +0100116
Joerg Roedel59d3daa2009-01-09 13:01:56 +0100117/* number of preallocated entries requested by kernel cmdline */
118static u32 req_entries;
119
Joerg Roedel788dcfa2009-01-09 13:13:27 +0100120/* debugfs dentry's for the stuff above */
121static struct dentry *dma_debug_dent __read_mostly;
122static struct dentry *global_disable_dent __read_mostly;
123static struct dentry *error_count_dent __read_mostly;
124static struct dentry *show_all_errors_dent __read_mostly;
125static struct dentry *show_num_errors_dent __read_mostly;
126static struct dentry *num_free_entries_dent __read_mostly;
127static struct dentry *min_free_entries_dent __read_mostly;
Joerg Roedel8a6fc702009-05-22 21:23:13 +0200128static struct dentry *filter_dent __read_mostly;
Joerg Roedel788dcfa2009-01-09 13:13:27 +0100129
Joerg Roedel2e507d82009-05-22 18:24:20 +0200130/* per-driver filter related state */
131
132#define NAME_MAX_LEN 64
133
134static char current_driver_name[NAME_MAX_LEN] __read_mostly;
135static struct device_driver *current_driver __read_mostly;
136
137static DEFINE_RWLOCK(driver_name_lock);
Joerg Roedel30dfa902009-01-09 12:34:49 +0100138
Shuah Khan6c9c6d62012-10-08 11:08:06 -0600139static const char *const maperr2str[] = {
140 [MAP_ERR_CHECK_NOT_APPLICABLE] = "dma map error check not applicable",
141 [MAP_ERR_NOT_CHECKED] = "dma map error not checked",
142 [MAP_ERR_CHECKED] = "dma map error checked",
143};
144
Joerg Roedel2d62ece2009-01-09 14:10:26 +0100145static const char *type2name[4] = { "single", "page",
146 "scather-gather", "coherent" };
147
148static const char *dir2name[4] = { "DMA_BIDIRECTIONAL", "DMA_TO_DEVICE",
149 "DMA_FROM_DEVICE", "DMA_NONE" };
150
151/*
152 * The access to some variables in this macro is racy. We can't use atomic_t
153 * here because all these variables are exported to debugfs. Some of them even
154 * writeable. This is also the reason why a lock won't help much. But anyway,
155 * the races are no big deal. Here is why:
156 *
157 * error_count: the addition is racy, but the worst thing that can happen is
158 * that we don't count some errors
159 * show_num_errors: the subtraction is racy. Also no big deal because in
160 * worst case this will result in one warning more in the
161 * system log than the user configured. This variable is
162 * writeable via debugfs.
163 */
David Woodhouse6c132d12009-01-19 16:52:39 +0100164static inline void dump_entry_trace(struct dma_debug_entry *entry)
165{
166#ifdef CONFIG_STACKTRACE
167 if (entry) {
Joerg Roedele7ed70e2009-06-08 15:39:24 +0200168 pr_warning("Mapped at:\n");
David Woodhouse6c132d12009-01-19 16:52:39 +0100169 print_stack_trace(&entry->stacktrace, 0);
170 }
171#endif
172}
173
Joerg Roedel2e507d82009-05-22 18:24:20 +0200174static bool driver_filter(struct device *dev)
175{
Joerg Roedel0bf84122009-06-08 15:53:46 +0200176 struct device_driver *drv;
177 unsigned long flags;
178 bool ret;
179
Joerg Roedel2e507d82009-05-22 18:24:20 +0200180 /* driver filter off */
181 if (likely(!current_driver_name[0]))
182 return true;
183
184 /* driver filter on and initialized */
Kyle McMartinec9c96e2009-08-19 21:17:08 -0400185 if (current_driver && dev && dev->driver == current_driver)
Joerg Roedel2e507d82009-05-22 18:24:20 +0200186 return true;
187
Kyle McMartinec9c96e2009-08-19 21:17:08 -0400188 /* driver filter on, but we can't filter on a NULL device... */
189 if (!dev)
190 return false;
191
Joerg Roedel0bf84122009-06-08 15:53:46 +0200192 if (current_driver || !current_driver_name[0])
193 return false;
194
Joerg Roedel2e507d82009-05-22 18:24:20 +0200195 /* driver filter on but not yet initialized */
Alan Sternf3ff9242012-01-24 13:35:24 -0500196 drv = dev->driver;
Joerg Roedel0bf84122009-06-08 15:53:46 +0200197 if (!drv)
198 return false;
Joerg Roedel2e507d82009-05-22 18:24:20 +0200199
Joerg Roedel0bf84122009-06-08 15:53:46 +0200200 /* lock to protect against change of current_driver_name */
201 read_lock_irqsave(&driver_name_lock, flags);
Joerg Roedel2e507d82009-05-22 18:24:20 +0200202
Joerg Roedel0bf84122009-06-08 15:53:46 +0200203 ret = false;
204 if (drv->name &&
205 strncmp(current_driver_name, drv->name, NAME_MAX_LEN - 1) == 0) {
206 current_driver = drv;
207 ret = true;
Joerg Roedel2e507d82009-05-22 18:24:20 +0200208 }
209
Joerg Roedel0bf84122009-06-08 15:53:46 +0200210 read_unlock_irqrestore(&driver_name_lock, flags);
Joerg Roedel0bf84122009-06-08 15:53:46 +0200211
212 return ret;
Joerg Roedel2e507d82009-05-22 18:24:20 +0200213}
214
Kyle McMartinec9c96e2009-08-19 21:17:08 -0400215#define err_printk(dev, entry, format, arg...) do { \
216 error_count += 1; \
217 if (driver_filter(dev) && \
218 (show_all_errors || show_num_errors > 0)) { \
219 WARN(1, "%s %s: " format, \
220 dev ? dev_driver_string(dev) : "NULL", \
221 dev ? dev_name(dev) : "NULL", ## arg); \
222 dump_entry_trace(entry); \
223 } \
224 if (!show_all_errors && show_num_errors > 0) \
225 show_num_errors -= 1; \
Joerg Roedel2d62ece2009-01-09 14:10:26 +0100226 } while (0);
227
Joerg Roedel30dfa902009-01-09 12:34:49 +0100228/*
229 * Hash related functions
230 *
231 * Every DMA-API request is saved into a struct dma_debug_entry. To
232 * have quick access to these structs they are stored into a hash.
233 */
234static int hash_fn(struct dma_debug_entry *entry)
235{
236 /*
237 * Hash function is based on the dma address.
238 * We use bits 20-27 here as the index into the hash
239 */
240 return (entry->dev_addr >> HASH_FN_SHIFT) & HASH_FN_MASK;
241}
242
243/*
244 * Request exclusive access to a hash bucket for a given dma_debug_entry.
245 */
246static struct hash_bucket *get_hash_bucket(struct dma_debug_entry *entry,
247 unsigned long *flags)
248{
249 int idx = hash_fn(entry);
250 unsigned long __flags;
251
252 spin_lock_irqsave(&dma_entry_hash[idx].lock, __flags);
253 *flags = __flags;
254 return &dma_entry_hash[idx];
255}
256
257/*
258 * Give up exclusive access to the hash bucket
259 */
260static void put_hash_bucket(struct hash_bucket *bucket,
261 unsigned long *flags)
262{
263 unsigned long __flags = *flags;
264
265 spin_unlock_irqrestore(&bucket->lock, __flags);
266}
267
Neil Hormanc6a21d02011-08-08 15:13:54 -0400268static bool exact_match(struct dma_debug_entry *a, struct dma_debug_entry *b)
269{
Thomas Jarosch91ec37c2011-11-17 20:31:02 +0100270 return ((a->dev_addr == b->dev_addr) &&
Neil Hormanc6a21d02011-08-08 15:13:54 -0400271 (a->dev == b->dev)) ? true : false;
272}
273
274static bool containing_match(struct dma_debug_entry *a,
275 struct dma_debug_entry *b)
276{
277 if (a->dev != b->dev)
278 return false;
279
280 if ((b->dev_addr <= a->dev_addr) &&
281 ((b->dev_addr + b->size) >= (a->dev_addr + a->size)))
282 return true;
283
284 return false;
285}
286
Joerg Roedel30dfa902009-01-09 12:34:49 +0100287/*
288 * Search a given entry in the hash bucket list
289 */
Neil Hormanc6a21d02011-08-08 15:13:54 -0400290static struct dma_debug_entry *__hash_bucket_find(struct hash_bucket *bucket,
291 struct dma_debug_entry *ref,
292 match_fn match)
Joerg Roedel30dfa902009-01-09 12:34:49 +0100293{
Joerg Roedel7caf6a42009-06-05 12:01:35 +0200294 struct dma_debug_entry *entry, *ret = NULL;
Ming Leife73fbe2012-10-19 13:57:01 -0700295 int matches = 0, match_lvl, last_lvl = -1;
Joerg Roedel30dfa902009-01-09 12:34:49 +0100296
297 list_for_each_entry(entry, &bucket->list, list) {
Neil Hormanc6a21d02011-08-08 15:13:54 -0400298 if (!match(ref, entry))
Joerg Roedel7caf6a42009-06-05 12:01:35 +0200299 continue;
300
301 /*
302 * Some drivers map the same physical address multiple
303 * times. Without a hardware IOMMU this results in the
304 * same device addresses being put into the dma-debug
305 * hash multiple times too. This can result in false
André Goddard Rosaaf901ca2009-11-14 13:09:05 -0200306 * positives being reported. Therefore we implement a
Joerg Roedel7caf6a42009-06-05 12:01:35 +0200307 * best-fit algorithm here which returns the entry from
308 * the hash which fits best to the reference value
309 * instead of the first-fit.
310 */
311 matches += 1;
312 match_lvl = 0;
Joerg Roedele5e8c5b2009-06-11 10:03:42 +0200313 entry->size == ref->size ? ++match_lvl : 0;
314 entry->type == ref->type ? ++match_lvl : 0;
315 entry->direction == ref->direction ? ++match_lvl : 0;
316 entry->sg_call_ents == ref->sg_call_ents ? ++match_lvl : 0;
Joerg Roedel7caf6a42009-06-05 12:01:35 +0200317
Joerg Roedele5e8c5b2009-06-11 10:03:42 +0200318 if (match_lvl == 4) {
Joerg Roedel7caf6a42009-06-05 12:01:35 +0200319 /* perfect-fit - return the result */
Joerg Roedel30dfa902009-01-09 12:34:49 +0100320 return entry;
Joerg Roedel7caf6a42009-06-05 12:01:35 +0200321 } else if (match_lvl > last_lvl) {
322 /*
323 * We found an entry that fits better then the
Ming Leife73fbe2012-10-19 13:57:01 -0700324 * previous one or it is the 1st match.
Joerg Roedel7caf6a42009-06-05 12:01:35 +0200325 */
326 last_lvl = match_lvl;
327 ret = entry;
328 }
Joerg Roedel30dfa902009-01-09 12:34:49 +0100329 }
330
Joerg Roedel7caf6a42009-06-05 12:01:35 +0200331 /*
332 * If we have multiple matches but no perfect-fit, just return
333 * NULL.
334 */
335 ret = (matches == 1) ? ret : NULL;
336
337 return ret;
Joerg Roedel30dfa902009-01-09 12:34:49 +0100338}
339
Neil Hormanc6a21d02011-08-08 15:13:54 -0400340static struct dma_debug_entry *bucket_find_exact(struct hash_bucket *bucket,
341 struct dma_debug_entry *ref)
342{
343 return __hash_bucket_find(bucket, ref, exact_match);
344}
345
346static struct dma_debug_entry *bucket_find_contain(struct hash_bucket **bucket,
347 struct dma_debug_entry *ref,
348 unsigned long *flags)
349{
350
351 unsigned int max_range = dma_get_max_seg_size(ref->dev);
352 struct dma_debug_entry *entry, index = *ref;
353 unsigned int range = 0;
354
355 while (range <= max_range) {
356 entry = __hash_bucket_find(*bucket, &index, containing_match);
357
358 if (entry)
359 return entry;
360
361 /*
362 * Nothing found, go back a hash bucket
363 */
364 put_hash_bucket(*bucket, flags);
365 range += (1 << HASH_FN_SHIFT);
366 index.dev_addr -= (1 << HASH_FN_SHIFT);
367 *bucket = get_hash_bucket(&index, flags);
368 }
369
370 return NULL;
371}
372
Joerg Roedel30dfa902009-01-09 12:34:49 +0100373/*
374 * Add an entry to a hash bucket
375 */
376static void hash_bucket_add(struct hash_bucket *bucket,
377 struct dma_debug_entry *entry)
378{
379 list_add_tail(&entry->list, &bucket->list);
380}
381
382/*
383 * Remove entry from a hash bucket list
384 */
385static void hash_bucket_del(struct dma_debug_entry *entry)
386{
387 list_del(&entry->list);
388}
389
Dan Williams0abdd7a2014-01-21 15:48:12 -0800390static unsigned long long phys_addr(struct dma_debug_entry *entry)
391{
392 return page_to_phys(pfn_to_page(entry->pfn)) + entry->offset;
393}
394
Joerg Roedel30dfa902009-01-09 12:34:49 +0100395/*
David Woodhouseac26c182009-02-12 16:19:13 +0100396 * Dump mapping entries for debugging purposes
397 */
398void debug_dma_dump_mappings(struct device *dev)
399{
400 int idx;
401
402 for (idx = 0; idx < HASH_SIZE; idx++) {
403 struct hash_bucket *bucket = &dma_entry_hash[idx];
404 struct dma_debug_entry *entry;
405 unsigned long flags;
406
407 spin_lock_irqsave(&bucket->lock, flags);
408
409 list_for_each_entry(entry, &bucket->list, list) {
410 if (!dev || dev == entry->dev) {
411 dev_info(entry->dev,
Dan Williams0abdd7a2014-01-21 15:48:12 -0800412 "%s idx %d P=%Lx N=%lx D=%Lx L=%Lx %s %s\n",
David Woodhouseac26c182009-02-12 16:19:13 +0100413 type2name[entry->type], idx,
Dan Williams0abdd7a2014-01-21 15:48:12 -0800414 phys_addr(entry), entry->pfn,
David Woodhouseac26c182009-02-12 16:19:13 +0100415 entry->dev_addr, entry->size,
Shuah Khan6c9c6d62012-10-08 11:08:06 -0600416 dir2name[entry->direction],
417 maperr2str[entry->map_err_type]);
David Woodhouseac26c182009-02-12 16:19:13 +0100418 }
419 }
420
421 spin_unlock_irqrestore(&bucket->lock, flags);
422 }
423}
424EXPORT_SYMBOL(debug_dma_dump_mappings);
425
426/*
Dan Williams0abdd7a2014-01-21 15:48:12 -0800427 * For each page mapped (initial page in the case of
428 * dma_alloc_coherent/dma_map_{single|page}, or each page in a
429 * scatterlist) insert into this tree using the pfn as the key. At
430 * dma_unmap_{single|sg|page} or dma_free_coherent delete the entry. If
431 * the pfn already exists at insertion time add a tag as a reference
432 * count for the overlapping mappings. For now, the overlap tracking
433 * just ensures that 'unmaps' balance 'maps' before marking the pfn
434 * idle, but we should also be flagging overlaps as an API violation.
435 *
436 * Memory usage is mostly constrained by the maximum number of available
437 * dma-debug entries in that we need a free dma_debug_entry before
438 * inserting into the tree. In the case of dma_map_{single|page} and
439 * dma_alloc_coherent there is only one dma_debug_entry and one pfn to
440 * track per event. dma_map_sg(), on the other hand,
441 * consumes a single dma_debug_entry, but inserts 'nents' entries into
442 * the tree.
443 *
444 * At any time debug_dma_assert_idle() can be called to trigger a
445 * warning if the given page is in the active set.
446 */
447static RADIX_TREE(dma_active_pfn, GFP_NOWAIT);
448static DEFINE_SPINLOCK(radix_lock);
449#define ACTIVE_PFN_MAX_OVERLAP ((1 << RADIX_TREE_MAX_TAGS) - 1)
450
451static int active_pfn_read_overlap(unsigned long pfn)
452{
453 int overlap = 0, i;
454
455 for (i = RADIX_TREE_MAX_TAGS - 1; i >= 0; i--)
456 if (radix_tree_tag_get(&dma_active_pfn, pfn, i))
457 overlap |= 1 << i;
458 return overlap;
459}
460
461static int active_pfn_set_overlap(unsigned long pfn, int overlap)
462{
463 int i;
464
465 if (overlap > ACTIVE_PFN_MAX_OVERLAP || overlap < 0)
Dan Williams59f2e7d2014-01-29 14:05:53 -0800466 return overlap;
Dan Williams0abdd7a2014-01-21 15:48:12 -0800467
468 for (i = RADIX_TREE_MAX_TAGS - 1; i >= 0; i--)
469 if (overlap & 1 << i)
470 radix_tree_tag_set(&dma_active_pfn, pfn, i);
471 else
472 radix_tree_tag_clear(&dma_active_pfn, pfn, i);
473
474 return overlap;
475}
476
477static void active_pfn_inc_overlap(unsigned long pfn)
478{
479 int overlap = active_pfn_read_overlap(pfn);
480
481 overlap = active_pfn_set_overlap(pfn, ++overlap);
482
483 /* If we overflowed the overlap counter then we're potentially
484 * leaking dma-mappings. Otherwise, if maps and unmaps are
485 * balanced then this overflow may cause false negatives in
486 * debug_dma_assert_idle() as the pfn may be marked idle
487 * prematurely.
488 */
Dan Williams59f2e7d2014-01-29 14:05:53 -0800489 WARN_ONCE(overlap > ACTIVE_PFN_MAX_OVERLAP,
Dan Williams0abdd7a2014-01-21 15:48:12 -0800490 "DMA-API: exceeded %d overlapping mappings of pfn %lx\n",
491 ACTIVE_PFN_MAX_OVERLAP, pfn);
492}
493
494static int active_pfn_dec_overlap(unsigned long pfn)
495{
496 int overlap = active_pfn_read_overlap(pfn);
497
498 return active_pfn_set_overlap(pfn, --overlap);
499}
500
501static int active_pfn_insert(struct dma_debug_entry *entry)
502{
503 unsigned long flags;
504 int rc;
505
506 spin_lock_irqsave(&radix_lock, flags);
507 rc = radix_tree_insert(&dma_active_pfn, entry->pfn, entry);
508 if (rc == -EEXIST)
509 active_pfn_inc_overlap(entry->pfn);
510 spin_unlock_irqrestore(&radix_lock, flags);
511
512 return rc;
513}
514
515static void active_pfn_remove(struct dma_debug_entry *entry)
516{
517 unsigned long flags;
518
519 spin_lock_irqsave(&radix_lock, flags);
Dan Williams59f2e7d2014-01-29 14:05:53 -0800520 /* since we are counting overlaps the final put of the
521 * entry->pfn will occur when the overlap count is 0.
522 * active_pfn_dec_overlap() returns -1 in that case
523 */
524 if (active_pfn_dec_overlap(entry->pfn) < 0)
Dan Williams0abdd7a2014-01-21 15:48:12 -0800525 radix_tree_delete(&dma_active_pfn, entry->pfn);
526 spin_unlock_irqrestore(&radix_lock, flags);
527}
528
529/**
530 * debug_dma_assert_idle() - assert that a page is not undergoing dma
531 * @page: page to lookup in the dma_active_pfn tree
532 *
533 * Place a call to this routine in cases where the cpu touching the page
534 * before the dma completes (page is dma_unmapped) will lead to data
535 * corruption.
536 */
537void debug_dma_assert_idle(struct page *page)
538{
539 unsigned long flags;
540 struct dma_debug_entry *entry;
541
542 if (!page)
543 return;
544
545 spin_lock_irqsave(&radix_lock, flags);
546 entry = radix_tree_lookup(&dma_active_pfn, page_to_pfn(page));
547 spin_unlock_irqrestore(&radix_lock, flags);
548
549 if (!entry)
550 return;
551
552 err_printk(entry->dev, entry,
553 "DMA-API: cpu touching an active dma mapped page "
554 "[pfn=0x%lx]\n", entry->pfn);
555}
556
557/*
Joerg Roedel30dfa902009-01-09 12:34:49 +0100558 * Wrapper function for adding an entry to the hash.
559 * This function takes care of locking itself.
560 */
561static void add_dma_entry(struct dma_debug_entry *entry)
562{
563 struct hash_bucket *bucket;
564 unsigned long flags;
Dan Williams0abdd7a2014-01-21 15:48:12 -0800565 int rc;
Joerg Roedel30dfa902009-01-09 12:34:49 +0100566
567 bucket = get_hash_bucket(entry, &flags);
568 hash_bucket_add(bucket, entry);
569 put_hash_bucket(bucket, &flags);
Dan Williams0abdd7a2014-01-21 15:48:12 -0800570
571 rc = active_pfn_insert(entry);
572 if (rc == -ENOMEM) {
573 pr_err("DMA-API: pfn tracking ENOMEM, dma-debug disabled\n");
574 global_disable = true;
575 }
576
577 /* TODO: report -EEXIST errors here as overlapping mappings are
578 * not supported by the DMA API
579 */
Joerg Roedel30dfa902009-01-09 12:34:49 +0100580}
581
FUJITA Tomonorie6a1a892009-04-15 18:22:41 +0900582static struct dma_debug_entry *__dma_entry_alloc(void)
583{
584 struct dma_debug_entry *entry;
585
586 entry = list_entry(free_entries.next, struct dma_debug_entry, list);
587 list_del(&entry->list);
588 memset(entry, 0, sizeof(*entry));
589
590 num_free_entries -= 1;
591 if (num_free_entries < min_free_entries)
592 min_free_entries = num_free_entries;
593
594 return entry;
595}
596
Joerg Roedel3b1e79e2009-01-09 12:42:46 +0100597/* struct dma_entry allocator
598 *
599 * The next two functions implement the allocator for
600 * struct dma_debug_entries.
601 */
602static struct dma_debug_entry *dma_entry_alloc(void)
603{
Jakub Kicinski29cdd4e2012-04-04 03:19:10 +0200604 struct dma_debug_entry *entry;
Joerg Roedel3b1e79e2009-01-09 12:42:46 +0100605 unsigned long flags;
606
607 spin_lock_irqsave(&free_entries_lock, flags);
608
609 if (list_empty(&free_entries)) {
Joerg Roedele7ed70e2009-06-08 15:39:24 +0200610 pr_err("DMA-API: debugging out of memory - disabling\n");
Joerg Roedel3b1e79e2009-01-09 12:42:46 +0100611 global_disable = true;
Jakub Kicinski29cdd4e2012-04-04 03:19:10 +0200612 spin_unlock_irqrestore(&free_entries_lock, flags);
613 return NULL;
Joerg Roedel3b1e79e2009-01-09 12:42:46 +0100614 }
615
FUJITA Tomonorie6a1a892009-04-15 18:22:41 +0900616 entry = __dma_entry_alloc();
Joerg Roedel3b1e79e2009-01-09 12:42:46 +0100617
Jakub Kicinski29cdd4e2012-04-04 03:19:10 +0200618 spin_unlock_irqrestore(&free_entries_lock, flags);
619
David Woodhouse6c132d12009-01-19 16:52:39 +0100620#ifdef CONFIG_STACKTRACE
621 entry->stacktrace.max_entries = DMA_DEBUG_STACKTRACE_ENTRIES;
622 entry->stacktrace.entries = entry->st_entries;
623 entry->stacktrace.skip = 2;
624 save_stack_trace(&entry->stacktrace);
625#endif
Joerg Roedel3b1e79e2009-01-09 12:42:46 +0100626
Joerg Roedel3b1e79e2009-01-09 12:42:46 +0100627 return entry;
628}
629
630static void dma_entry_free(struct dma_debug_entry *entry)
631{
632 unsigned long flags;
633
Dan Williams0abdd7a2014-01-21 15:48:12 -0800634 active_pfn_remove(entry);
635
Joerg Roedel3b1e79e2009-01-09 12:42:46 +0100636 /*
637 * add to beginning of the list - this way the entries are
638 * more likely cache hot when they are reallocated.
639 */
640 spin_lock_irqsave(&free_entries_lock, flags);
641 list_add(&entry->list, &free_entries);
642 num_free_entries += 1;
643 spin_unlock_irqrestore(&free_entries_lock, flags);
644}
645
FUJITA Tomonorie6a1a892009-04-15 18:22:41 +0900646int dma_debug_resize_entries(u32 num_entries)
647{
648 int i, delta, ret = 0;
649 unsigned long flags;
650 struct dma_debug_entry *entry;
651 LIST_HEAD(tmp);
652
653 spin_lock_irqsave(&free_entries_lock, flags);
654
655 if (nr_total_entries < num_entries) {
656 delta = num_entries - nr_total_entries;
657
658 spin_unlock_irqrestore(&free_entries_lock, flags);
659
660 for (i = 0; i < delta; i++) {
661 entry = kzalloc(sizeof(*entry), GFP_KERNEL);
662 if (!entry)
663 break;
664
665 list_add_tail(&entry->list, &tmp);
666 }
667
668 spin_lock_irqsave(&free_entries_lock, flags);
669
670 list_splice(&tmp, &free_entries);
671 nr_total_entries += i;
672 num_free_entries += i;
673 } else {
674 delta = nr_total_entries - num_entries;
675
676 for (i = 0; i < delta && !list_empty(&free_entries); i++) {
677 entry = __dma_entry_alloc();
678 kfree(entry);
679 }
680
681 nr_total_entries -= i;
682 }
683
684 if (nr_total_entries != num_entries)
685 ret = 1;
686
687 spin_unlock_irqrestore(&free_entries_lock, flags);
688
689 return ret;
690}
691EXPORT_SYMBOL(dma_debug_resize_entries);
692
Joerg Roedel6bf07872009-01-09 12:54:42 +0100693/*
694 * DMA-API debugging init code
695 *
696 * The init code does two things:
697 * 1. Initialize core data structures
698 * 2. Preallocate a given number of dma_debug_entry structs
699 */
700
701static int prealloc_memory(u32 num_entries)
702{
703 struct dma_debug_entry *entry, *next_entry;
704 int i;
705
706 for (i = 0; i < num_entries; ++i) {
707 entry = kzalloc(sizeof(*entry), GFP_KERNEL);
708 if (!entry)
709 goto out_err;
710
711 list_add_tail(&entry->list, &free_entries);
712 }
713
714 num_free_entries = num_entries;
715 min_free_entries = num_entries;
716
Joerg Roedele7ed70e2009-06-08 15:39:24 +0200717 pr_info("DMA-API: preallocated %d debug entries\n", num_entries);
Joerg Roedel6bf07872009-01-09 12:54:42 +0100718
719 return 0;
720
721out_err:
722
723 list_for_each_entry_safe(entry, next_entry, &free_entries, list) {
724 list_del(&entry->list);
725 kfree(entry);
726 }
727
728 return -ENOMEM;
729}
730
Joerg Roedel8a6fc702009-05-22 21:23:13 +0200731static ssize_t filter_read(struct file *file, char __user *user_buf,
732 size_t count, loff_t *ppos)
733{
Joerg Roedel8a6fc702009-05-22 21:23:13 +0200734 char buf[NAME_MAX_LEN + 1];
Joerg Roedelc17e2cf2009-06-08 15:19:29 +0200735 unsigned long flags;
Joerg Roedel8a6fc702009-05-22 21:23:13 +0200736 int len;
737
738 if (!current_driver_name[0])
739 return 0;
740
741 /*
742 * We can't copy to userspace directly because current_driver_name can
743 * only be read under the driver_name_lock with irqs disabled. So
744 * create a temporary copy first.
745 */
746 read_lock_irqsave(&driver_name_lock, flags);
747 len = scnprintf(buf, NAME_MAX_LEN + 1, "%s\n", current_driver_name);
748 read_unlock_irqrestore(&driver_name_lock, flags);
749
750 return simple_read_from_buffer(user_buf, count, ppos, buf, len);
751}
752
753static ssize_t filter_write(struct file *file, const char __user *userbuf,
754 size_t count, loff_t *ppos)
755{
Joerg Roedel8a6fc702009-05-22 21:23:13 +0200756 char buf[NAME_MAX_LEN];
Joerg Roedelc17e2cf2009-06-08 15:19:29 +0200757 unsigned long flags;
758 size_t len;
Joerg Roedel8a6fc702009-05-22 21:23:13 +0200759 int i;
760
761 /*
762 * We can't copy from userspace directly. Access to
763 * current_driver_name is protected with a write_lock with irqs
764 * disabled. Since copy_from_user can fault and may sleep we
765 * need to copy to temporary buffer first
766 */
Joerg Roedele7ed70e2009-06-08 15:39:24 +0200767 len = min(count, (size_t)(NAME_MAX_LEN - 1));
Joerg Roedel8a6fc702009-05-22 21:23:13 +0200768 if (copy_from_user(buf, userbuf, len))
769 return -EFAULT;
770
771 buf[len] = 0;
772
773 write_lock_irqsave(&driver_name_lock, flags);
774
Joerg Roedel312325092009-06-08 15:07:08 +0200775 /*
776 * Now handle the string we got from userspace very carefully.
Joerg Roedel8a6fc702009-05-22 21:23:13 +0200777 * The rules are:
778 * - only use the first token we got
779 * - token delimiter is everything looking like a space
780 * character (' ', '\n', '\t' ...)
781 *
782 */
783 if (!isalnum(buf[0])) {
784 /*
Joerg Roedel312325092009-06-08 15:07:08 +0200785 * If the first character userspace gave us is not
Joerg Roedel8a6fc702009-05-22 21:23:13 +0200786 * alphanumerical then assume the filter should be
787 * switched off.
788 */
789 if (current_driver_name[0])
Joerg Roedele7ed70e2009-06-08 15:39:24 +0200790 pr_info("DMA-API: switching off dma-debug driver filter\n");
Joerg Roedel8a6fc702009-05-22 21:23:13 +0200791 current_driver_name[0] = 0;
792 current_driver = NULL;
793 goto out_unlock;
794 }
795
796 /*
797 * Now parse out the first token and use it as the name for the
798 * driver to filter for.
799 */
Dan Carpenter39a37ce2010-04-06 19:45:12 +0300800 for (i = 0; i < NAME_MAX_LEN - 1; ++i) {
Joerg Roedel8a6fc702009-05-22 21:23:13 +0200801 current_driver_name[i] = buf[i];
802 if (isspace(buf[i]) || buf[i] == ' ' || buf[i] == 0)
803 break;
804 }
805 current_driver_name[i] = 0;
806 current_driver = NULL;
807
Joerg Roedele7ed70e2009-06-08 15:39:24 +0200808 pr_info("DMA-API: enable driver filter for driver [%s]\n",
809 current_driver_name);
Joerg Roedel8a6fc702009-05-22 21:23:13 +0200810
811out_unlock:
812 write_unlock_irqrestore(&driver_name_lock, flags);
813
814 return count;
815}
816
Thiago Farinaaeb583d2010-01-18 18:57:33 -0500817static const struct file_operations filter_fops = {
Joerg Roedel8a6fc702009-05-22 21:23:13 +0200818 .read = filter_read,
819 .write = filter_write,
Arnd Bergmann6038f372010-08-15 18:52:59 +0200820 .llseek = default_llseek,
Joerg Roedel8a6fc702009-05-22 21:23:13 +0200821};
822
Joerg Roedel788dcfa2009-01-09 13:13:27 +0100823static int dma_debug_fs_init(void)
824{
825 dma_debug_dent = debugfs_create_dir("dma-api", NULL);
826 if (!dma_debug_dent) {
Joerg Roedele7ed70e2009-06-08 15:39:24 +0200827 pr_err("DMA-API: can not create debugfs directory\n");
Joerg Roedel788dcfa2009-01-09 13:13:27 +0100828 return -ENOMEM;
829 }
830
831 global_disable_dent = debugfs_create_bool("disabled", 0444,
832 dma_debug_dent,
Dan Carpenter68ee6d22012-06-27 12:08:55 +0300833 &global_disable);
Joerg Roedel788dcfa2009-01-09 13:13:27 +0100834 if (!global_disable_dent)
835 goto out_err;
836
837 error_count_dent = debugfs_create_u32("error_count", 0444,
838 dma_debug_dent, &error_count);
839 if (!error_count_dent)
840 goto out_err;
841
842 show_all_errors_dent = debugfs_create_u32("all_errors", 0644,
843 dma_debug_dent,
844 &show_all_errors);
845 if (!show_all_errors_dent)
846 goto out_err;
847
848 show_num_errors_dent = debugfs_create_u32("num_errors", 0644,
849 dma_debug_dent,
850 &show_num_errors);
851 if (!show_num_errors_dent)
852 goto out_err;
853
854 num_free_entries_dent = debugfs_create_u32("num_free_entries", 0444,
855 dma_debug_dent,
856 &num_free_entries);
857 if (!num_free_entries_dent)
858 goto out_err;
859
860 min_free_entries_dent = debugfs_create_u32("min_free_entries", 0444,
861 dma_debug_dent,
862 &min_free_entries);
863 if (!min_free_entries_dent)
864 goto out_err;
865
Joerg Roedel8a6fc702009-05-22 21:23:13 +0200866 filter_dent = debugfs_create_file("driver_filter", 0644,
867 dma_debug_dent, NULL, &filter_fops);
868 if (!filter_dent)
869 goto out_err;
870
Joerg Roedel788dcfa2009-01-09 13:13:27 +0100871 return 0;
872
873out_err:
874 debugfs_remove_recursive(dma_debug_dent);
875
876 return -ENOMEM;
877}
878
Stanislaw Gruszkaba4b87ad2011-03-31 08:08:09 -0400879static int device_dma_allocations(struct device *dev, struct dma_debug_entry **out_entry)
Joerg Roedeled888ae2009-05-22 17:16:04 +0200880{
881 struct dma_debug_entry *entry;
882 unsigned long flags;
883 int count = 0, i;
884
Joerg Roedelbe81c6e2009-06-08 15:46:19 +0200885 local_irq_save(flags);
886
Joerg Roedeled888ae2009-05-22 17:16:04 +0200887 for (i = 0; i < HASH_SIZE; ++i) {
Joerg Roedelbe81c6e2009-06-08 15:46:19 +0200888 spin_lock(&dma_entry_hash[i].lock);
Joerg Roedeled888ae2009-05-22 17:16:04 +0200889 list_for_each_entry(entry, &dma_entry_hash[i].list, list) {
Stanislaw Gruszkaba4b87ad2011-03-31 08:08:09 -0400890 if (entry->dev == dev) {
Joerg Roedeled888ae2009-05-22 17:16:04 +0200891 count += 1;
Stanislaw Gruszkaba4b87ad2011-03-31 08:08:09 -0400892 *out_entry = entry;
893 }
Joerg Roedeled888ae2009-05-22 17:16:04 +0200894 }
Joerg Roedelbe81c6e2009-06-08 15:46:19 +0200895 spin_unlock(&dma_entry_hash[i].lock);
Joerg Roedeled888ae2009-05-22 17:16:04 +0200896 }
897
Joerg Roedelbe81c6e2009-06-08 15:46:19 +0200898 local_irq_restore(flags);
899
Joerg Roedeled888ae2009-05-22 17:16:04 +0200900 return count;
901}
902
Ingo Molnara8fe9ea2009-12-31 15:16:23 +0100903static int dma_debug_device_change(struct notifier_block *nb, unsigned long action, void *data)
Joerg Roedeled888ae2009-05-22 17:16:04 +0200904{
905 struct device *dev = data;
Stanislaw Gruszkaba4b87ad2011-03-31 08:08:09 -0400906 struct dma_debug_entry *uninitialized_var(entry);
Joerg Roedeled888ae2009-05-22 17:16:04 +0200907 int count;
908
Shaun Ruffellf797d982009-12-17 18:00:36 -0600909 if (global_disable)
Ingo Molnara8fe9ea2009-12-31 15:16:23 +0100910 return 0;
Joerg Roedeled888ae2009-05-22 17:16:04 +0200911
912 switch (action) {
913 case BUS_NOTIFY_UNBOUND_DRIVER:
Stanislaw Gruszkaba4b87ad2011-03-31 08:08:09 -0400914 count = device_dma_allocations(dev, &entry);
Joerg Roedeled888ae2009-05-22 17:16:04 +0200915 if (count == 0)
916 break;
Stanislaw Gruszkaba4b87ad2011-03-31 08:08:09 -0400917 err_printk(dev, entry, "DMA-API: device driver has pending "
Joerg Roedeled888ae2009-05-22 17:16:04 +0200918 "DMA allocations while released from device "
Stanislaw Gruszkaba4b87ad2011-03-31 08:08:09 -0400919 "[count=%d]\n"
920 "One of leaked entries details: "
921 "[device address=0x%016llx] [size=%llu bytes] "
922 "[mapped with %s] [mapped as %s]\n",
923 count, entry->dev_addr, entry->size,
924 dir2name[entry->direction], type2name[entry->type]);
Joerg Roedeled888ae2009-05-22 17:16:04 +0200925 break;
926 default:
927 break;
928 }
929
930 return 0;
931}
932
Joerg Roedel41531c82009-03-16 17:32:14 +0100933void dma_debug_add_bus(struct bus_type *bus)
934{
Joerg Roedeled888ae2009-05-22 17:16:04 +0200935 struct notifier_block *nb;
936
Shaun Ruffellf797d982009-12-17 18:00:36 -0600937 if (global_disable)
938 return;
939
Joerg Roedeled888ae2009-05-22 17:16:04 +0200940 nb = kzalloc(sizeof(struct notifier_block), GFP_KERNEL);
941 if (nb == NULL) {
Joerg Roedele7ed70e2009-06-08 15:39:24 +0200942 pr_err("dma_debug_add_bus: out of memory\n");
Joerg Roedeled888ae2009-05-22 17:16:04 +0200943 return;
944 }
945
946 nb->notifier_call = dma_debug_device_change;
947
948 bus_register_notifier(bus, nb);
Joerg Roedel41531c82009-03-16 17:32:14 +0100949}
Joerg Roedel788dcfa2009-01-09 13:13:27 +0100950
Joerg Roedel6bf07872009-01-09 12:54:42 +0100951/*
952 * Let the architectures decide how many entries should be preallocated.
953 */
954void dma_debug_init(u32 num_entries)
955{
956 int i;
957
958 if (global_disable)
959 return;
960
961 for (i = 0; i < HASH_SIZE; ++i) {
962 INIT_LIST_HEAD(&dma_entry_hash[i].list);
Ingo Molnarb0a5b832009-06-16 16:11:14 +0200963 spin_lock_init(&dma_entry_hash[i].lock);
Joerg Roedel6bf07872009-01-09 12:54:42 +0100964 }
965
Joerg Roedel788dcfa2009-01-09 13:13:27 +0100966 if (dma_debug_fs_init() != 0) {
Joerg Roedele7ed70e2009-06-08 15:39:24 +0200967 pr_err("DMA-API: error creating debugfs entries - disabling\n");
Joerg Roedel788dcfa2009-01-09 13:13:27 +0100968 global_disable = true;
969
970 return;
971 }
972
Joerg Roedel59d3daa2009-01-09 13:01:56 +0100973 if (req_entries)
974 num_entries = req_entries;
975
Joerg Roedel6bf07872009-01-09 12:54:42 +0100976 if (prealloc_memory(num_entries) != 0) {
Joerg Roedele7ed70e2009-06-08 15:39:24 +0200977 pr_err("DMA-API: debugging out of memory error - disabled\n");
Joerg Roedel6bf07872009-01-09 12:54:42 +0100978 global_disable = true;
979
980 return;
981 }
982
FUJITA Tomonorie6a1a892009-04-15 18:22:41 +0900983 nr_total_entries = num_free_entries;
984
Joerg Roedele7ed70e2009-06-08 15:39:24 +0200985 pr_info("DMA-API: debugging enabled by kernel config\n");
Joerg Roedel6bf07872009-01-09 12:54:42 +0100986}
987
Joerg Roedel59d3daa2009-01-09 13:01:56 +0100988static __init int dma_debug_cmdline(char *str)
989{
990 if (!str)
991 return -EINVAL;
992
993 if (strncmp(str, "off", 3) == 0) {
Joerg Roedele7ed70e2009-06-08 15:39:24 +0200994 pr_info("DMA-API: debugging disabled on kernel command line\n");
Joerg Roedel59d3daa2009-01-09 13:01:56 +0100995 global_disable = true;
996 }
997
998 return 0;
999}
1000
1001static __init int dma_debug_entries_cmdline(char *str)
1002{
1003 int res;
1004
1005 if (!str)
1006 return -EINVAL;
1007
1008 res = get_option(&str, &req_entries);
1009
1010 if (!res)
1011 req_entries = 0;
1012
1013 return 0;
1014}
1015
1016__setup("dma_debug=", dma_debug_cmdline);
1017__setup("dma_debug_entries=", dma_debug_entries_cmdline);
1018
Joerg Roedel2d62ece2009-01-09 14:10:26 +01001019static void check_unmap(struct dma_debug_entry *ref)
1020{
1021 struct dma_debug_entry *entry;
1022 struct hash_bucket *bucket;
1023 unsigned long flags;
1024
Joerg Roedel2d62ece2009-01-09 14:10:26 +01001025 bucket = get_hash_bucket(ref, &flags);
Neil Hormanc6a21d02011-08-08 15:13:54 -04001026 entry = bucket_find_exact(bucket, ref);
Joerg Roedel2d62ece2009-01-09 14:10:26 +01001027
1028 if (!entry) {
Alexander Duyck8d640a52013-03-22 15:04:48 -07001029 /* must drop lock before calling dma_mapping_error */
1030 put_hash_bucket(bucket, &flags);
1031
Shuah Khanbfe0fb02012-11-03 17:00:07 -06001032 if (dma_mapping_error(ref->dev, ref->dev_addr)) {
1033 err_printk(ref->dev, NULL,
Alexander Duyck8d640a52013-03-22 15:04:48 -07001034 "DMA-API: device driver tries to free an "
1035 "invalid DMA memory address\n");
1036 } else {
1037 err_printk(ref->dev, NULL,
1038 "DMA-API: device driver tries to free DMA "
1039 "memory it has not allocated [device "
1040 "address=0x%016llx] [size=%llu bytes]\n",
1041 ref->dev_addr, ref->size);
Shuah Khanbfe0fb02012-11-03 17:00:07 -06001042 }
Alexander Duyck8d640a52013-03-22 15:04:48 -07001043 return;
Joerg Roedel2d62ece2009-01-09 14:10:26 +01001044 }
1045
1046 if (ref->size != entry->size) {
David Woodhouse6c132d12009-01-19 16:52:39 +01001047 err_printk(ref->dev, entry, "DMA-API: device driver frees "
Joerg Roedel2d62ece2009-01-09 14:10:26 +01001048 "DMA memory with different size "
1049 "[device address=0x%016llx] [map size=%llu bytes] "
1050 "[unmap size=%llu bytes]\n",
1051 ref->dev_addr, entry->size, ref->size);
1052 }
1053
1054 if (ref->type != entry->type) {
David Woodhouse6c132d12009-01-19 16:52:39 +01001055 err_printk(ref->dev, entry, "DMA-API: device driver frees "
Joerg Roedel2d62ece2009-01-09 14:10:26 +01001056 "DMA memory with wrong function "
1057 "[device address=0x%016llx] [size=%llu bytes] "
1058 "[mapped as %s] [unmapped as %s]\n",
1059 ref->dev_addr, ref->size,
1060 type2name[entry->type], type2name[ref->type]);
1061 } else if ((entry->type == dma_debug_coherent) &&
Dan Williams0abdd7a2014-01-21 15:48:12 -08001062 (phys_addr(ref) != phys_addr(entry))) {
David Woodhouse6c132d12009-01-19 16:52:39 +01001063 err_printk(ref->dev, entry, "DMA-API: device driver frees "
Joerg Roedel2d62ece2009-01-09 14:10:26 +01001064 "DMA memory with different CPU address "
1065 "[device address=0x%016llx] [size=%llu bytes] "
Joerg Roedel59a40e702009-10-29 16:25:50 +01001066 "[cpu alloc address=0x%016llx] "
1067 "[cpu free address=0x%016llx]",
Joerg Roedel2d62ece2009-01-09 14:10:26 +01001068 ref->dev_addr, ref->size,
Dan Williams0abdd7a2014-01-21 15:48:12 -08001069 phys_addr(entry),
1070 phys_addr(ref));
Joerg Roedel2d62ece2009-01-09 14:10:26 +01001071 }
1072
1073 if (ref->sg_call_ents && ref->type == dma_debug_sg &&
1074 ref->sg_call_ents != entry->sg_call_ents) {
David Woodhouse6c132d12009-01-19 16:52:39 +01001075 err_printk(ref->dev, entry, "DMA-API: device driver frees "
Joerg Roedel2d62ece2009-01-09 14:10:26 +01001076 "DMA sg list with different entry count "
1077 "[map count=%d] [unmap count=%d]\n",
1078 entry->sg_call_ents, ref->sg_call_ents);
1079 }
1080
1081 /*
1082 * This may be no bug in reality - but most implementations of the
1083 * DMA API don't handle this properly, so check for it here
1084 */
1085 if (ref->direction != entry->direction) {
David Woodhouse6c132d12009-01-19 16:52:39 +01001086 err_printk(ref->dev, entry, "DMA-API: device driver frees "
Joerg Roedel2d62ece2009-01-09 14:10:26 +01001087 "DMA memory with different direction "
1088 "[device address=0x%016llx] [size=%llu bytes] "
1089 "[mapped with %s] [unmapped with %s]\n",
1090 ref->dev_addr, ref->size,
1091 dir2name[entry->direction],
1092 dir2name[ref->direction]);
1093 }
1094
Shuah Khan6c9c6d62012-10-08 11:08:06 -06001095 if (entry->map_err_type == MAP_ERR_NOT_CHECKED) {
1096 err_printk(ref->dev, entry,
1097 "DMA-API: device driver failed to check map error"
1098 "[device address=0x%016llx] [size=%llu bytes] "
1099 "[mapped as %s]",
1100 ref->dev_addr, ref->size,
1101 type2name[entry->type]);
1102 }
1103
Joerg Roedel2d62ece2009-01-09 14:10:26 +01001104 hash_bucket_del(entry);
1105 dma_entry_free(entry);
1106
Joerg Roedel2d62ece2009-01-09 14:10:26 +01001107 put_hash_bucket(bucket, &flags);
1108}
1109
1110static void check_for_stack(struct device *dev, void *addr)
1111{
1112 if (object_is_on_stack(addr))
David Woodhouse6c132d12009-01-19 16:52:39 +01001113 err_printk(dev, NULL, "DMA-API: device driver maps memory from"
1114 "stack [addr=%p]\n", addr);
Joerg Roedel2d62ece2009-01-09 14:10:26 +01001115}
1116
Ingo Molnarf39d1b92009-07-10 21:38:02 +02001117static inline bool overlap(void *addr, unsigned long len, void *start, void *end)
Joerg Roedel2e34bde2009-03-16 16:51:55 +01001118{
Ingo Molnarf39d1b92009-07-10 21:38:02 +02001119 unsigned long a1 = (unsigned long)addr;
1120 unsigned long b1 = a1 + len;
1121 unsigned long a2 = (unsigned long)start;
1122 unsigned long b2 = (unsigned long)end;
Joerg Roedel2e34bde2009-03-16 16:51:55 +01001123
Ingo Molnarf39d1b92009-07-10 21:38:02 +02001124 return !(b1 <= a2 || a1 >= b2);
Joerg Roedel2e34bde2009-03-16 16:51:55 +01001125}
1126
Ingo Molnarf39d1b92009-07-10 21:38:02 +02001127static void check_for_illegal_area(struct device *dev, void *addr, unsigned long len)
Joerg Roedel2e34bde2009-03-16 16:51:55 +01001128{
Ingo Molnarf39d1b92009-07-10 21:38:02 +02001129 if (overlap(addr, len, _text, _etext) ||
1130 overlap(addr, len, __start_rodata, __end_rodata))
1131 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 +01001132}
1133
Joerg Roedelaa010ef2009-06-12 15:25:06 +02001134static void check_sync(struct device *dev,
1135 struct dma_debug_entry *ref,
1136 bool to_cpu)
Joerg Roedel2d62ece2009-01-09 14:10:26 +01001137{
Joerg Roedel2d62ece2009-01-09 14:10:26 +01001138 struct dma_debug_entry *entry;
1139 struct hash_bucket *bucket;
1140 unsigned long flags;
1141
Joerg Roedelaa010ef2009-06-12 15:25:06 +02001142 bucket = get_hash_bucket(ref, &flags);
Joerg Roedel2d62ece2009-01-09 14:10:26 +01001143
Neil Hormanc6a21d02011-08-08 15:13:54 -04001144 entry = bucket_find_contain(&bucket, ref, &flags);
Joerg Roedel2d62ece2009-01-09 14:10:26 +01001145
1146 if (!entry) {
David Woodhouse6c132d12009-01-19 16:52:39 +01001147 err_printk(dev, NULL, "DMA-API: device driver tries "
Joerg Roedel2d62ece2009-01-09 14:10:26 +01001148 "to sync DMA memory it has not allocated "
1149 "[device address=0x%016llx] [size=%llu bytes]\n",
Joerg Roedelaa010ef2009-06-12 15:25:06 +02001150 (unsigned long long)ref->dev_addr, ref->size);
Joerg Roedel2d62ece2009-01-09 14:10:26 +01001151 goto out;
1152 }
1153
Joerg Roedelaa010ef2009-06-12 15:25:06 +02001154 if (ref->size > entry->size) {
David Woodhouse6c132d12009-01-19 16:52:39 +01001155 err_printk(dev, entry, "DMA-API: device driver syncs"
Joerg Roedel2d62ece2009-01-09 14:10:26 +01001156 " DMA memory outside allocated range "
1157 "[device address=0x%016llx] "
Joerg Roedelaa010ef2009-06-12 15:25:06 +02001158 "[allocation size=%llu bytes] "
1159 "[sync offset+size=%llu]\n",
1160 entry->dev_addr, entry->size,
1161 ref->size);
Joerg Roedel2d62ece2009-01-09 14:10:26 +01001162 }
1163
Krzysztof Halasa42d53b42010-01-08 14:42:36 -08001164 if (entry->direction == DMA_BIDIRECTIONAL)
1165 goto out;
1166
Joerg Roedelaa010ef2009-06-12 15:25:06 +02001167 if (ref->direction != entry->direction) {
David Woodhouse6c132d12009-01-19 16:52:39 +01001168 err_printk(dev, entry, "DMA-API: device driver syncs "
Joerg Roedel2d62ece2009-01-09 14:10:26 +01001169 "DMA memory with different direction "
1170 "[device address=0x%016llx] [size=%llu bytes] "
1171 "[mapped with %s] [synced with %s]\n",
Joerg Roedelaa010ef2009-06-12 15:25:06 +02001172 (unsigned long long)ref->dev_addr, entry->size,
Joerg Roedel2d62ece2009-01-09 14:10:26 +01001173 dir2name[entry->direction],
Joerg Roedelaa010ef2009-06-12 15:25:06 +02001174 dir2name[ref->direction]);
Joerg Roedel2d62ece2009-01-09 14:10:26 +01001175 }
1176
Joerg Roedel2d62ece2009-01-09 14:10:26 +01001177 if (to_cpu && !(entry->direction == DMA_FROM_DEVICE) &&
Joerg Roedelaa010ef2009-06-12 15:25:06 +02001178 !(ref->direction == DMA_TO_DEVICE))
David Woodhouse6c132d12009-01-19 16:52:39 +01001179 err_printk(dev, entry, "DMA-API: device driver syncs "
Joerg Roedel2d62ece2009-01-09 14:10:26 +01001180 "device read-only DMA memory for cpu "
1181 "[device address=0x%016llx] [size=%llu bytes] "
1182 "[mapped with %s] [synced with %s]\n",
Joerg Roedelaa010ef2009-06-12 15:25:06 +02001183 (unsigned long long)ref->dev_addr, entry->size,
Joerg Roedel2d62ece2009-01-09 14:10:26 +01001184 dir2name[entry->direction],
Joerg Roedelaa010ef2009-06-12 15:25:06 +02001185 dir2name[ref->direction]);
Joerg Roedel2d62ece2009-01-09 14:10:26 +01001186
1187 if (!to_cpu && !(entry->direction == DMA_TO_DEVICE) &&
Joerg Roedelaa010ef2009-06-12 15:25:06 +02001188 !(ref->direction == DMA_FROM_DEVICE))
David Woodhouse6c132d12009-01-19 16:52:39 +01001189 err_printk(dev, entry, "DMA-API: device driver syncs "
Joerg Roedel2d62ece2009-01-09 14:10:26 +01001190 "device write-only DMA memory to device "
1191 "[device address=0x%016llx] [size=%llu bytes] "
1192 "[mapped with %s] [synced with %s]\n",
Joerg Roedelaa010ef2009-06-12 15:25:06 +02001193 (unsigned long long)ref->dev_addr, entry->size,
Joerg Roedel2d62ece2009-01-09 14:10:26 +01001194 dir2name[entry->direction],
Joerg Roedelaa010ef2009-06-12 15:25:06 +02001195 dir2name[ref->direction]);
Joerg Roedel2d62ece2009-01-09 14:10:26 +01001196
1197out:
1198 put_hash_bucket(bucket, &flags);
Joerg Roedel2d62ece2009-01-09 14:10:26 +01001199}
1200
Joerg Roedelf62bc982009-01-09 14:14:49 +01001201void debug_dma_map_page(struct device *dev, struct page *page, size_t offset,
1202 size_t size, int direction, dma_addr_t dma_addr,
1203 bool map_single)
1204{
1205 struct dma_debug_entry *entry;
1206
1207 if (unlikely(global_disable))
1208 return;
1209
Shuah Khanbfe0fb02012-11-03 17:00:07 -06001210 if (dma_mapping_error(dev, dma_addr))
Joerg Roedelf62bc982009-01-09 14:14:49 +01001211 return;
1212
1213 entry = dma_entry_alloc();
1214 if (!entry)
1215 return;
1216
1217 entry->dev = dev;
1218 entry->type = dma_debug_page;
Dan Williams0abdd7a2014-01-21 15:48:12 -08001219 entry->pfn = page_to_pfn(page);
1220 entry->offset = offset,
Joerg Roedelf62bc982009-01-09 14:14:49 +01001221 entry->dev_addr = dma_addr;
1222 entry->size = size;
1223 entry->direction = direction;
Shuah Khan6c9c6d62012-10-08 11:08:06 -06001224 entry->map_err_type = MAP_ERR_NOT_CHECKED;
Joerg Roedelf62bc982009-01-09 14:14:49 +01001225
Joerg Roedel9537a482009-03-23 15:35:08 +01001226 if (map_single)
Joerg Roedelf62bc982009-01-09 14:14:49 +01001227 entry->type = dma_debug_single;
Joerg Roedel9537a482009-03-23 15:35:08 +01001228
1229 if (!PageHighMem(page)) {
Ingo Molnarf39d1b92009-07-10 21:38:02 +02001230 void *addr = page_address(page) + offset;
1231
Joerg Roedel2e34bde2009-03-16 16:51:55 +01001232 check_for_stack(dev, addr);
1233 check_for_illegal_area(dev, addr, size);
Joerg Roedelf62bc982009-01-09 14:14:49 +01001234 }
1235
1236 add_dma_entry(entry);
1237}
1238EXPORT_SYMBOL(debug_dma_map_page);
1239
Shuah Khan6c9c6d62012-10-08 11:08:06 -06001240void debug_dma_mapping_error(struct device *dev, dma_addr_t dma_addr)
1241{
1242 struct dma_debug_entry ref;
1243 struct dma_debug_entry *entry;
1244 struct hash_bucket *bucket;
1245 unsigned long flags;
1246
1247 if (unlikely(global_disable))
1248 return;
1249
1250 ref.dev = dev;
1251 ref.dev_addr = dma_addr;
1252 bucket = get_hash_bucket(&ref, &flags);
Shuah Khan6c9c6d62012-10-08 11:08:06 -06001253
Alexander Duyck96e7d7a2013-03-22 15:04:49 -07001254 list_for_each_entry(entry, &bucket->list, list) {
1255 if (!exact_match(&ref, entry))
1256 continue;
Shuah Khan6c9c6d62012-10-08 11:08:06 -06001257
Alexander Duyck96e7d7a2013-03-22 15:04:49 -07001258 /*
1259 * The same physical address can be mapped multiple
1260 * times. Without a hardware IOMMU this results in the
1261 * same device addresses being put into the dma-debug
1262 * hash multiple times too. This can result in false
1263 * positives being reported. Therefore we implement a
1264 * best-fit algorithm here which updates the first entry
1265 * from the hash which fits the reference value and is
1266 * not currently listed as being checked.
1267 */
1268 if (entry->map_err_type == MAP_ERR_NOT_CHECKED) {
1269 entry->map_err_type = MAP_ERR_CHECKED;
1270 break;
1271 }
1272 }
1273
Shuah Khan6c9c6d62012-10-08 11:08:06 -06001274 put_hash_bucket(bucket, &flags);
1275}
1276EXPORT_SYMBOL(debug_dma_mapping_error);
1277
Joerg Roedelf62bc982009-01-09 14:14:49 +01001278void debug_dma_unmap_page(struct device *dev, dma_addr_t addr,
1279 size_t size, int direction, bool map_single)
1280{
1281 struct dma_debug_entry ref = {
1282 .type = dma_debug_page,
1283 .dev = dev,
1284 .dev_addr = addr,
1285 .size = size,
1286 .direction = direction,
1287 };
1288
1289 if (unlikely(global_disable))
1290 return;
1291
1292 if (map_single)
1293 ref.type = dma_debug_single;
1294
1295 check_unmap(&ref);
1296}
1297EXPORT_SYMBOL(debug_dma_unmap_page);
1298
Joerg Roedel972aa452009-01-09 14:19:54 +01001299void debug_dma_map_sg(struct device *dev, struct scatterlist *sg,
1300 int nents, int mapped_ents, int direction)
1301{
1302 struct dma_debug_entry *entry;
1303 struct scatterlist *s;
1304 int i;
1305
1306 if (unlikely(global_disable))
1307 return;
1308
1309 for_each_sg(sg, s, mapped_ents, i) {
1310 entry = dma_entry_alloc();
1311 if (!entry)
1312 return;
1313
1314 entry->type = dma_debug_sg;
1315 entry->dev = dev;
Dan Williams0abdd7a2014-01-21 15:48:12 -08001316 entry->pfn = page_to_pfn(sg_page(s));
1317 entry->offset = s->offset,
FUJITA Tomonori884d0592009-05-27 09:43:02 +09001318 entry->size = sg_dma_len(s);
FUJITA Tomonori15aedea2009-05-27 09:43:01 +09001319 entry->dev_addr = sg_dma_address(s);
Joerg Roedel972aa452009-01-09 14:19:54 +01001320 entry->direction = direction;
1321 entry->sg_call_ents = nents;
1322 entry->sg_mapped_ents = mapped_ents;
1323
Joerg Roedel9537a482009-03-23 15:35:08 +01001324 if (!PageHighMem(sg_page(s))) {
1325 check_for_stack(dev, sg_virt(s));
FUJITA Tomonori884d0592009-05-27 09:43:02 +09001326 check_for_illegal_area(dev, sg_virt(s), sg_dma_len(s));
Joerg Roedel9537a482009-03-23 15:35:08 +01001327 }
Joerg Roedel972aa452009-01-09 14:19:54 +01001328
1329 add_dma_entry(entry);
1330 }
1331}
1332EXPORT_SYMBOL(debug_dma_map_sg);
1333
Joerg Roedelaa010ef2009-06-12 15:25:06 +02001334static int get_nr_mapped_entries(struct device *dev,
1335 struct dma_debug_entry *ref)
FUJITA Tomonori88f39072009-05-27 09:43:03 +09001336{
Joerg Roedelaa010ef2009-06-12 15:25:06 +02001337 struct dma_debug_entry *entry;
FUJITA Tomonori88f39072009-05-27 09:43:03 +09001338 struct hash_bucket *bucket;
1339 unsigned long flags;
Joerg Roedelc17e2cf2009-06-08 15:19:29 +02001340 int mapped_ents;
FUJITA Tomonori88f39072009-05-27 09:43:03 +09001341
Joerg Roedelaa010ef2009-06-12 15:25:06 +02001342 bucket = get_hash_bucket(ref, &flags);
Neil Hormanc6a21d02011-08-08 15:13:54 -04001343 entry = bucket_find_exact(bucket, ref);
Joerg Roedelc17e2cf2009-06-08 15:19:29 +02001344 mapped_ents = 0;
1345
FUJITA Tomonori88f39072009-05-27 09:43:03 +09001346 if (entry)
1347 mapped_ents = entry->sg_mapped_ents;
1348 put_hash_bucket(bucket, &flags);
1349
1350 return mapped_ents;
1351}
1352
Joerg Roedel972aa452009-01-09 14:19:54 +01001353void debug_dma_unmap_sg(struct device *dev, struct scatterlist *sglist,
1354 int nelems, int dir)
1355{
Joerg Roedel972aa452009-01-09 14:19:54 +01001356 struct scatterlist *s;
1357 int mapped_ents = 0, i;
Joerg Roedel972aa452009-01-09 14:19:54 +01001358
1359 if (unlikely(global_disable))
1360 return;
1361
1362 for_each_sg(sglist, s, nelems, i) {
1363
1364 struct dma_debug_entry ref = {
1365 .type = dma_debug_sg,
1366 .dev = dev,
Dan Williams0abdd7a2014-01-21 15:48:12 -08001367 .pfn = page_to_pfn(sg_page(s)),
1368 .offset = s->offset,
FUJITA Tomonori15aedea2009-05-27 09:43:01 +09001369 .dev_addr = sg_dma_address(s),
FUJITA Tomonori884d0592009-05-27 09:43:02 +09001370 .size = sg_dma_len(s),
Joerg Roedel972aa452009-01-09 14:19:54 +01001371 .direction = dir,
Joerg Roedele5e8c5b2009-06-11 10:03:42 +02001372 .sg_call_ents = nelems,
Joerg Roedel972aa452009-01-09 14:19:54 +01001373 };
1374
1375 if (mapped_ents && i >= mapped_ents)
1376 break;
1377
Joerg Roedele5e8c5b2009-06-11 10:03:42 +02001378 if (!i)
Joerg Roedelaa010ef2009-06-12 15:25:06 +02001379 mapped_ents = get_nr_mapped_entries(dev, &ref);
Joerg Roedel972aa452009-01-09 14:19:54 +01001380
1381 check_unmap(&ref);
1382 }
1383}
1384EXPORT_SYMBOL(debug_dma_unmap_sg);
1385
Joerg Roedel6bfd4492009-01-09 14:38:50 +01001386void debug_dma_alloc_coherent(struct device *dev, size_t size,
1387 dma_addr_t dma_addr, void *virt)
1388{
1389 struct dma_debug_entry *entry;
1390
1391 if (unlikely(global_disable))
1392 return;
1393
1394 if (unlikely(virt == NULL))
1395 return;
1396
1397 entry = dma_entry_alloc();
1398 if (!entry)
1399 return;
1400
1401 entry->type = dma_debug_coherent;
1402 entry->dev = dev;
Dan Williams0abdd7a2014-01-21 15:48:12 -08001403 entry->pfn = page_to_pfn(virt_to_page(virt));
1404 entry->offset = (size_t) virt & PAGE_MASK;
Joerg Roedel6bfd4492009-01-09 14:38:50 +01001405 entry->size = size;
1406 entry->dev_addr = dma_addr;
1407 entry->direction = DMA_BIDIRECTIONAL;
1408
1409 add_dma_entry(entry);
1410}
1411EXPORT_SYMBOL(debug_dma_alloc_coherent);
1412
1413void debug_dma_free_coherent(struct device *dev, size_t size,
1414 void *virt, dma_addr_t addr)
1415{
1416 struct dma_debug_entry ref = {
1417 .type = dma_debug_coherent,
1418 .dev = dev,
Dan Williams0abdd7a2014-01-21 15:48:12 -08001419 .pfn = page_to_pfn(virt_to_page(virt)),
1420 .offset = (size_t) virt & PAGE_MASK,
Joerg Roedel6bfd4492009-01-09 14:38:50 +01001421 .dev_addr = addr,
1422 .size = size,
1423 .direction = DMA_BIDIRECTIONAL,
1424 };
1425
1426 if (unlikely(global_disable))
1427 return;
1428
1429 check_unmap(&ref);
1430}
1431EXPORT_SYMBOL(debug_dma_free_coherent);
1432
Joerg Roedelb9d23172009-01-09 14:43:04 +01001433void debug_dma_sync_single_for_cpu(struct device *dev, dma_addr_t dma_handle,
1434 size_t size, int direction)
1435{
Joerg Roedelaa010ef2009-06-12 15:25:06 +02001436 struct dma_debug_entry ref;
1437
Joerg Roedelb9d23172009-01-09 14:43:04 +01001438 if (unlikely(global_disable))
1439 return;
1440
Joerg Roedelaa010ef2009-06-12 15:25:06 +02001441 ref.type = dma_debug_single;
1442 ref.dev = dev;
1443 ref.dev_addr = dma_handle;
1444 ref.size = size;
1445 ref.direction = direction;
1446 ref.sg_call_ents = 0;
1447
1448 check_sync(dev, &ref, true);
Joerg Roedelb9d23172009-01-09 14:43:04 +01001449}
1450EXPORT_SYMBOL(debug_dma_sync_single_for_cpu);
1451
1452void debug_dma_sync_single_for_device(struct device *dev,
1453 dma_addr_t dma_handle, size_t size,
1454 int direction)
1455{
Joerg Roedelaa010ef2009-06-12 15:25:06 +02001456 struct dma_debug_entry ref;
1457
Joerg Roedelb9d23172009-01-09 14:43:04 +01001458 if (unlikely(global_disable))
1459 return;
1460
Joerg Roedelaa010ef2009-06-12 15:25:06 +02001461 ref.type = dma_debug_single;
1462 ref.dev = dev;
1463 ref.dev_addr = dma_handle;
1464 ref.size = size;
1465 ref.direction = direction;
1466 ref.sg_call_ents = 0;
1467
1468 check_sync(dev, &ref, false);
Joerg Roedelb9d23172009-01-09 14:43:04 +01001469}
1470EXPORT_SYMBOL(debug_dma_sync_single_for_device);
1471
Joerg Roedel948408b2009-01-09 14:55:38 +01001472void debug_dma_sync_single_range_for_cpu(struct device *dev,
1473 dma_addr_t dma_handle,
1474 unsigned long offset, size_t size,
1475 int direction)
1476{
Joerg Roedelaa010ef2009-06-12 15:25:06 +02001477 struct dma_debug_entry ref;
1478
Joerg Roedel948408b2009-01-09 14:55:38 +01001479 if (unlikely(global_disable))
1480 return;
1481
Joerg Roedelaa010ef2009-06-12 15:25:06 +02001482 ref.type = dma_debug_single;
1483 ref.dev = dev;
1484 ref.dev_addr = dma_handle;
1485 ref.size = offset + size;
1486 ref.direction = direction;
1487 ref.sg_call_ents = 0;
1488
1489 check_sync(dev, &ref, true);
Joerg Roedel948408b2009-01-09 14:55:38 +01001490}
1491EXPORT_SYMBOL(debug_dma_sync_single_range_for_cpu);
1492
1493void debug_dma_sync_single_range_for_device(struct device *dev,
1494 dma_addr_t dma_handle,
1495 unsigned long offset,
1496 size_t size, int direction)
1497{
Joerg Roedelaa010ef2009-06-12 15:25:06 +02001498 struct dma_debug_entry ref;
1499
Joerg Roedel948408b2009-01-09 14:55:38 +01001500 if (unlikely(global_disable))
1501 return;
1502
Joerg Roedelaa010ef2009-06-12 15:25:06 +02001503 ref.type = dma_debug_single;
1504 ref.dev = dev;
1505 ref.dev_addr = dma_handle;
1506 ref.size = offset + size;
1507 ref.direction = direction;
1508 ref.sg_call_ents = 0;
1509
1510 check_sync(dev, &ref, false);
Joerg Roedel948408b2009-01-09 14:55:38 +01001511}
1512EXPORT_SYMBOL(debug_dma_sync_single_range_for_device);
1513
Joerg Roedela31fba52009-01-09 15:01:12 +01001514void debug_dma_sync_sg_for_cpu(struct device *dev, struct scatterlist *sg,
1515 int nelems, int direction)
1516{
1517 struct scatterlist *s;
FUJITA Tomonori88f39072009-05-27 09:43:03 +09001518 int mapped_ents = 0, i;
Joerg Roedela31fba52009-01-09 15:01:12 +01001519
1520 if (unlikely(global_disable))
1521 return;
1522
1523 for_each_sg(sg, s, nelems, i) {
Joerg Roedelaa010ef2009-06-12 15:25:06 +02001524
1525 struct dma_debug_entry ref = {
1526 .type = dma_debug_sg,
1527 .dev = dev,
Dan Williams0abdd7a2014-01-21 15:48:12 -08001528 .pfn = page_to_pfn(sg_page(s)),
1529 .offset = s->offset,
Joerg Roedelaa010ef2009-06-12 15:25:06 +02001530 .dev_addr = sg_dma_address(s),
1531 .size = sg_dma_len(s),
1532 .direction = direction,
1533 .sg_call_ents = nelems,
1534 };
1535
FUJITA Tomonori88f39072009-05-27 09:43:03 +09001536 if (!i)
Joerg Roedelaa010ef2009-06-12 15:25:06 +02001537 mapped_ents = get_nr_mapped_entries(dev, &ref);
FUJITA Tomonori88f39072009-05-27 09:43:03 +09001538
1539 if (i >= mapped_ents)
1540 break;
1541
Joerg Roedelaa010ef2009-06-12 15:25:06 +02001542 check_sync(dev, &ref, true);
Joerg Roedela31fba52009-01-09 15:01:12 +01001543 }
1544}
1545EXPORT_SYMBOL(debug_dma_sync_sg_for_cpu);
1546
1547void debug_dma_sync_sg_for_device(struct device *dev, struct scatterlist *sg,
1548 int nelems, int direction)
1549{
1550 struct scatterlist *s;
FUJITA Tomonori88f39072009-05-27 09:43:03 +09001551 int mapped_ents = 0, i;
Joerg Roedela31fba52009-01-09 15:01:12 +01001552
1553 if (unlikely(global_disable))
1554 return;
1555
1556 for_each_sg(sg, s, nelems, i) {
Joerg Roedelaa010ef2009-06-12 15:25:06 +02001557
1558 struct dma_debug_entry ref = {
1559 .type = dma_debug_sg,
1560 .dev = dev,
Dan Williams0abdd7a2014-01-21 15:48:12 -08001561 .pfn = page_to_pfn(sg_page(s)),
1562 .offset = s->offset,
Joerg Roedelaa010ef2009-06-12 15:25:06 +02001563 .dev_addr = sg_dma_address(s),
1564 .size = sg_dma_len(s),
1565 .direction = direction,
1566 .sg_call_ents = nelems,
1567 };
FUJITA Tomonori88f39072009-05-27 09:43:03 +09001568 if (!i)
Joerg Roedelaa010ef2009-06-12 15:25:06 +02001569 mapped_ents = get_nr_mapped_entries(dev, &ref);
FUJITA Tomonori88f39072009-05-27 09:43:03 +09001570
1571 if (i >= mapped_ents)
1572 break;
1573
Joerg Roedelaa010ef2009-06-12 15:25:06 +02001574 check_sync(dev, &ref, false);
Joerg Roedela31fba52009-01-09 15:01:12 +01001575 }
1576}
1577EXPORT_SYMBOL(debug_dma_sync_sg_for_device);
1578
Joerg Roedel1745de52009-05-22 21:49:51 +02001579static int __init dma_debug_driver_setup(char *str)
1580{
1581 int i;
1582
1583 for (i = 0; i < NAME_MAX_LEN - 1; ++i, ++str) {
1584 current_driver_name[i] = *str;
1585 if (*str == 0)
1586 break;
1587 }
1588
1589 if (current_driver_name[0])
Joerg Roedele7ed70e2009-06-08 15:39:24 +02001590 pr_info("DMA-API: enable driver filter for driver [%s]\n",
1591 current_driver_name);
Joerg Roedel1745de52009-05-22 21:49:51 +02001592
1593
1594 return 1;
1595}
1596__setup("dma_debug_driver=", dma_debug_driver_setup);