blob: 8971370bfb1619eb9d3acd332045129542092ee0 [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>
Andy Lutomirskib4a0f532016-08-11 02:35:22 -070025#include <linux/vmalloc.h>
Joerg Roedel788dcfa2009-01-09 13:13:27 +010026#include <linux/debugfs.h>
Joerg Roedel8a6fc702009-05-22 21:23:13 +020027#include <linux/uaccess.h>
Paul Gortmaker23a7bfa2011-07-01 16:23:59 -040028#include <linux/export.h>
Joerg Roedel2d62ece2009-01-09 14:10:26 +010029#include <linux/device.h>
Joerg Roedelf2f45e52009-01-09 12:19:52 +010030#include <linux/types.h>
Joerg Roedel2d62ece2009-01-09 14:10:26 +010031#include <linux/sched.h>
Joerg Roedel8a6fc702009-05-22 21:23:13 +020032#include <linux/ctype.h>
Joerg Roedelf2f45e52009-01-09 12:19:52 +010033#include <linux/list.h>
Joerg Roedel6bf07872009-01-09 12:54:42 +010034#include <linux/slab.h>
Joerg Roedelf2f45e52009-01-09 12:19:52 +010035
Joerg Roedel2e34bde2009-03-16 16:51:55 +010036#include <asm/sections.h>
37
Joerg Roedel30dfa902009-01-09 12:34:49 +010038#define HASH_SIZE 1024ULL
39#define HASH_FN_SHIFT 13
40#define HASH_FN_MASK (HASH_SIZE - 1)
41
Joerg Roedelf2f45e52009-01-09 12:19:52 +010042enum {
43 dma_debug_single,
44 dma_debug_page,
45 dma_debug_sg,
46 dma_debug_coherent,
Niklas Söderlund0e74b342016-08-10 13:22:15 +020047 dma_debug_resource,
Joerg Roedelf2f45e52009-01-09 12:19:52 +010048};
49
Shuah Khan6c9c6d62012-10-08 11:08:06 -060050enum map_err_types {
51 MAP_ERR_CHECK_NOT_APPLICABLE,
52 MAP_ERR_NOT_CHECKED,
53 MAP_ERR_CHECKED,
54};
55
David Woodhouse6c132d12009-01-19 16:52:39 +010056#define DMA_DEBUG_STACKTRACE_ENTRIES 5
57
Dan Williams0abdd7a2014-01-21 15:48:12 -080058/**
59 * struct dma_debug_entry - track a dma_map* or dma_alloc_coherent mapping
60 * @list: node on pre-allocated free_entries list
61 * @dev: 'dev' argument to dma_map_{page|single|sg} or dma_alloc_coherent
62 * @type: single, page, sg, coherent
63 * @pfn: page frame of the start address
64 * @offset: offset of mapping relative to pfn
65 * @size: length of the mapping
66 * @direction: enum dma_data_direction
67 * @sg_call_ents: 'nents' from dma_map_sg
68 * @sg_mapped_ents: 'mapped_ents' from dma_map_sg
69 * @map_err_type: track whether dma_mapping_error() was checked
70 * @stacktrace: support backtraces when a violation is detected
71 */
Joerg Roedelf2f45e52009-01-09 12:19:52 +010072struct dma_debug_entry {
73 struct list_head list;
74 struct device *dev;
75 int type;
Dan Williams0abdd7a2014-01-21 15:48:12 -080076 unsigned long pfn;
77 size_t offset;
Joerg Roedelf2f45e52009-01-09 12:19:52 +010078 u64 dev_addr;
79 u64 size;
80 int direction;
81 int sg_call_ents;
82 int sg_mapped_ents;
Shuah Khan6c9c6d62012-10-08 11:08:06 -060083 enum map_err_types map_err_type;
David Woodhouse6c132d12009-01-19 16:52:39 +010084#ifdef CONFIG_STACKTRACE
85 struct stack_trace stacktrace;
86 unsigned long st_entries[DMA_DEBUG_STACKTRACE_ENTRIES];
87#endif
Joerg Roedelf2f45e52009-01-09 12:19:52 +010088};
89
Neil Hormanc6a21d02011-08-08 15:13:54 -040090typedef bool (*match_fn)(struct dma_debug_entry *, struct dma_debug_entry *);
91
Joerg Roedel30dfa902009-01-09 12:34:49 +010092struct hash_bucket {
93 struct list_head list;
94 spinlock_t lock;
Joerg Roedel2d62ece2009-01-09 14:10:26 +010095} ____cacheline_aligned_in_smp;
Joerg Roedel30dfa902009-01-09 12:34:49 +010096
97/* Hash list to save the allocated dma addresses */
98static struct hash_bucket dma_entry_hash[HASH_SIZE];
Joerg Roedel3b1e79e2009-01-09 12:42:46 +010099/* List of pre-allocated dma_debug_entry's */
100static LIST_HEAD(free_entries);
101/* Lock for the list above */
102static DEFINE_SPINLOCK(free_entries_lock);
103
104/* Global disable flag - will be set in case of an error */
Viresh Kumar621a5f72015-09-26 15:04:07 -0700105static bool global_disable __read_mostly;
Joerg Roedel3b1e79e2009-01-09 12:42:46 +0100106
Florian Fainelli2ce8e7e2014-12-10 15:41:25 -0800107/* Early initialization disable flag, set at the end of dma_debug_init */
108static bool dma_debug_initialized __read_mostly;
109
Florian Fainelli01ce18b2014-12-10 15:41:23 -0800110static inline bool dma_debug_disabled(void)
111{
Florian Fainelli2ce8e7e2014-12-10 15:41:25 -0800112 return global_disable || !dma_debug_initialized;
Florian Fainelli01ce18b2014-12-10 15:41:23 -0800113}
114
Joerg Roedel788dcfa2009-01-09 13:13:27 +0100115/* Global error count */
116static u32 error_count;
117
118/* Global error show enable*/
119static u32 show_all_errors __read_mostly;
120/* Number of errors to show */
121static u32 show_num_errors = 1;
122
Joerg Roedel3b1e79e2009-01-09 12:42:46 +0100123static u32 num_free_entries;
124static u32 min_free_entries;
FUJITA Tomonorie6a1a892009-04-15 18:22:41 +0900125static u32 nr_total_entries;
Joerg Roedel30dfa902009-01-09 12:34:49 +0100126
Joerg Roedel59d3daa2009-01-09 13:01:56 +0100127/* number of preallocated entries requested by kernel cmdline */
128static u32 req_entries;
129
Joerg Roedel788dcfa2009-01-09 13:13:27 +0100130/* debugfs dentry's for the stuff above */
131static struct dentry *dma_debug_dent __read_mostly;
132static struct dentry *global_disable_dent __read_mostly;
133static struct dentry *error_count_dent __read_mostly;
134static struct dentry *show_all_errors_dent __read_mostly;
135static struct dentry *show_num_errors_dent __read_mostly;
136static struct dentry *num_free_entries_dent __read_mostly;
137static struct dentry *min_free_entries_dent __read_mostly;
Joerg Roedel8a6fc702009-05-22 21:23:13 +0200138static struct dentry *filter_dent __read_mostly;
Joerg Roedel788dcfa2009-01-09 13:13:27 +0100139
Joerg Roedel2e507d82009-05-22 18:24:20 +0200140/* per-driver filter related state */
141
142#define NAME_MAX_LEN 64
143
144static char current_driver_name[NAME_MAX_LEN] __read_mostly;
145static struct device_driver *current_driver __read_mostly;
146
147static DEFINE_RWLOCK(driver_name_lock);
Joerg Roedel30dfa902009-01-09 12:34:49 +0100148
Shuah Khan6c9c6d62012-10-08 11:08:06 -0600149static const char *const maperr2str[] = {
150 [MAP_ERR_CHECK_NOT_APPLICABLE] = "dma map error check not applicable",
151 [MAP_ERR_NOT_CHECKED] = "dma map error not checked",
152 [MAP_ERR_CHECKED] = "dma map error checked",
153};
154
Niklas Söderlund0e74b342016-08-10 13:22:15 +0200155static const char *type2name[5] = { "single", "page",
156 "scather-gather", "coherent",
157 "resource" };
Joerg Roedel2d62ece2009-01-09 14:10:26 +0100158
159static const char *dir2name[4] = { "DMA_BIDIRECTIONAL", "DMA_TO_DEVICE",
160 "DMA_FROM_DEVICE", "DMA_NONE" };
161
162/*
163 * The access to some variables in this macro is racy. We can't use atomic_t
164 * here because all these variables are exported to debugfs. Some of them even
165 * writeable. This is also the reason why a lock won't help much. But anyway,
166 * the races are no big deal. Here is why:
167 *
168 * error_count: the addition is racy, but the worst thing that can happen is
169 * that we don't count some errors
170 * show_num_errors: the subtraction is racy. Also no big deal because in
171 * worst case this will result in one warning more in the
172 * system log than the user configured. This variable is
173 * writeable via debugfs.
174 */
David Woodhouse6c132d12009-01-19 16:52:39 +0100175static inline void dump_entry_trace(struct dma_debug_entry *entry)
176{
177#ifdef CONFIG_STACKTRACE
178 if (entry) {
Joerg Roedele7ed70e2009-06-08 15:39:24 +0200179 pr_warning("Mapped at:\n");
David Woodhouse6c132d12009-01-19 16:52:39 +0100180 print_stack_trace(&entry->stacktrace, 0);
181 }
182#endif
183}
184
Joerg Roedel2e507d82009-05-22 18:24:20 +0200185static bool driver_filter(struct device *dev)
186{
Joerg Roedel0bf84122009-06-08 15:53:46 +0200187 struct device_driver *drv;
188 unsigned long flags;
189 bool ret;
190
Joerg Roedel2e507d82009-05-22 18:24:20 +0200191 /* driver filter off */
192 if (likely(!current_driver_name[0]))
193 return true;
194
195 /* driver filter on and initialized */
Kyle McMartinec9c96e2009-08-19 21:17:08 -0400196 if (current_driver && dev && dev->driver == current_driver)
Joerg Roedel2e507d82009-05-22 18:24:20 +0200197 return true;
198
Kyle McMartinec9c96e2009-08-19 21:17:08 -0400199 /* driver filter on, but we can't filter on a NULL device... */
200 if (!dev)
201 return false;
202
Joerg Roedel0bf84122009-06-08 15:53:46 +0200203 if (current_driver || !current_driver_name[0])
204 return false;
205
Joerg Roedel2e507d82009-05-22 18:24:20 +0200206 /* driver filter on but not yet initialized */
Alan Sternf3ff9242012-01-24 13:35:24 -0500207 drv = dev->driver;
Joerg Roedel0bf84122009-06-08 15:53:46 +0200208 if (!drv)
209 return false;
Joerg Roedel2e507d82009-05-22 18:24:20 +0200210
Joerg Roedel0bf84122009-06-08 15:53:46 +0200211 /* lock to protect against change of current_driver_name */
212 read_lock_irqsave(&driver_name_lock, flags);
Joerg Roedel2e507d82009-05-22 18:24:20 +0200213
Joerg Roedel0bf84122009-06-08 15:53:46 +0200214 ret = false;
215 if (drv->name &&
216 strncmp(current_driver_name, drv->name, NAME_MAX_LEN - 1) == 0) {
217 current_driver = drv;
218 ret = true;
Joerg Roedel2e507d82009-05-22 18:24:20 +0200219 }
220
Joerg Roedel0bf84122009-06-08 15:53:46 +0200221 read_unlock_irqrestore(&driver_name_lock, flags);
Joerg Roedel0bf84122009-06-08 15:53:46 +0200222
223 return ret;
Joerg Roedel2e507d82009-05-22 18:24:20 +0200224}
225
Kyle McMartinec9c96e2009-08-19 21:17:08 -0400226#define err_printk(dev, entry, format, arg...) do { \
227 error_count += 1; \
228 if (driver_filter(dev) && \
229 (show_all_errors || show_num_errors > 0)) { \
230 WARN(1, "%s %s: " format, \
231 dev ? dev_driver_string(dev) : "NULL", \
232 dev ? dev_name(dev) : "NULL", ## arg); \
233 dump_entry_trace(entry); \
234 } \
235 if (!show_all_errors && show_num_errors > 0) \
236 show_num_errors -= 1; \
Joerg Roedel2d62ece2009-01-09 14:10:26 +0100237 } while (0);
238
Joerg Roedel30dfa902009-01-09 12:34:49 +0100239/*
240 * Hash related functions
241 *
242 * Every DMA-API request is saved into a struct dma_debug_entry. To
243 * have quick access to these structs they are stored into a hash.
244 */
245static int hash_fn(struct dma_debug_entry *entry)
246{
247 /*
248 * Hash function is based on the dma address.
249 * We use bits 20-27 here as the index into the hash
250 */
251 return (entry->dev_addr >> HASH_FN_SHIFT) & HASH_FN_MASK;
252}
253
254/*
255 * Request exclusive access to a hash bucket for a given dma_debug_entry.
256 */
257static struct hash_bucket *get_hash_bucket(struct dma_debug_entry *entry,
258 unsigned long *flags)
Stephen Boydd5dfc802016-07-26 15:21:08 -0700259 __acquires(&dma_entry_hash[idx].lock)
Joerg Roedel30dfa902009-01-09 12:34:49 +0100260{
261 int idx = hash_fn(entry);
262 unsigned long __flags;
263
264 spin_lock_irqsave(&dma_entry_hash[idx].lock, __flags);
265 *flags = __flags;
266 return &dma_entry_hash[idx];
267}
268
269/*
270 * Give up exclusive access to the hash bucket
271 */
272static void put_hash_bucket(struct hash_bucket *bucket,
273 unsigned long *flags)
Stephen Boydd5dfc802016-07-26 15:21:08 -0700274 __releases(&bucket->lock)
Joerg Roedel30dfa902009-01-09 12:34:49 +0100275{
276 unsigned long __flags = *flags;
277
278 spin_unlock_irqrestore(&bucket->lock, __flags);
279}
280
Neil Hormanc6a21d02011-08-08 15:13:54 -0400281static bool exact_match(struct dma_debug_entry *a, struct dma_debug_entry *b)
282{
Thomas Jarosch91ec37c2011-11-17 20:31:02 +0100283 return ((a->dev_addr == b->dev_addr) &&
Neil Hormanc6a21d02011-08-08 15:13:54 -0400284 (a->dev == b->dev)) ? true : false;
285}
286
287static bool containing_match(struct dma_debug_entry *a,
288 struct dma_debug_entry *b)
289{
290 if (a->dev != b->dev)
291 return false;
292
293 if ((b->dev_addr <= a->dev_addr) &&
294 ((b->dev_addr + b->size) >= (a->dev_addr + a->size)))
295 return true;
296
297 return false;
298}
299
Joerg Roedel30dfa902009-01-09 12:34:49 +0100300/*
301 * Search a given entry in the hash bucket list
302 */
Neil Hormanc6a21d02011-08-08 15:13:54 -0400303static struct dma_debug_entry *__hash_bucket_find(struct hash_bucket *bucket,
304 struct dma_debug_entry *ref,
305 match_fn match)
Joerg Roedel30dfa902009-01-09 12:34:49 +0100306{
Joerg Roedel7caf6a42009-06-05 12:01:35 +0200307 struct dma_debug_entry *entry, *ret = NULL;
Ming Leife73fbe2012-10-19 13:57:01 -0700308 int matches = 0, match_lvl, last_lvl = -1;
Joerg Roedel30dfa902009-01-09 12:34:49 +0100309
310 list_for_each_entry(entry, &bucket->list, list) {
Neil Hormanc6a21d02011-08-08 15:13:54 -0400311 if (!match(ref, entry))
Joerg Roedel7caf6a42009-06-05 12:01:35 +0200312 continue;
313
314 /*
315 * Some drivers map the same physical address multiple
316 * times. Without a hardware IOMMU this results in the
317 * same device addresses being put into the dma-debug
318 * hash multiple times too. This can result in false
André Goddard Rosaaf901ca2009-11-14 13:09:05 -0200319 * positives being reported. Therefore we implement a
Joerg Roedel7caf6a42009-06-05 12:01:35 +0200320 * best-fit algorithm here which returns the entry from
321 * the hash which fits best to the reference value
322 * instead of the first-fit.
323 */
324 matches += 1;
325 match_lvl = 0;
Joerg Roedele5e8c5b2009-06-11 10:03:42 +0200326 entry->size == ref->size ? ++match_lvl : 0;
327 entry->type == ref->type ? ++match_lvl : 0;
328 entry->direction == ref->direction ? ++match_lvl : 0;
329 entry->sg_call_ents == ref->sg_call_ents ? ++match_lvl : 0;
Joerg Roedel7caf6a42009-06-05 12:01:35 +0200330
Joerg Roedele5e8c5b2009-06-11 10:03:42 +0200331 if (match_lvl == 4) {
Joerg Roedel7caf6a42009-06-05 12:01:35 +0200332 /* perfect-fit - return the result */
Joerg Roedel30dfa902009-01-09 12:34:49 +0100333 return entry;
Joerg Roedel7caf6a42009-06-05 12:01:35 +0200334 } else if (match_lvl > last_lvl) {
335 /*
336 * We found an entry that fits better then the
Ming Leife73fbe2012-10-19 13:57:01 -0700337 * previous one or it is the 1st match.
Joerg Roedel7caf6a42009-06-05 12:01:35 +0200338 */
339 last_lvl = match_lvl;
340 ret = entry;
341 }
Joerg Roedel30dfa902009-01-09 12:34:49 +0100342 }
343
Joerg Roedel7caf6a42009-06-05 12:01:35 +0200344 /*
345 * If we have multiple matches but no perfect-fit, just return
346 * NULL.
347 */
348 ret = (matches == 1) ? ret : NULL;
349
350 return ret;
Joerg Roedel30dfa902009-01-09 12:34:49 +0100351}
352
Neil Hormanc6a21d02011-08-08 15:13:54 -0400353static struct dma_debug_entry *bucket_find_exact(struct hash_bucket *bucket,
354 struct dma_debug_entry *ref)
355{
356 return __hash_bucket_find(bucket, ref, exact_match);
357}
358
359static struct dma_debug_entry *bucket_find_contain(struct hash_bucket **bucket,
360 struct dma_debug_entry *ref,
361 unsigned long *flags)
362{
363
364 unsigned int max_range = dma_get_max_seg_size(ref->dev);
365 struct dma_debug_entry *entry, index = *ref;
366 unsigned int range = 0;
367
368 while (range <= max_range) {
Sebastian Otta7a2c022015-04-16 12:43:25 -0700369 entry = __hash_bucket_find(*bucket, ref, containing_match);
Neil Hormanc6a21d02011-08-08 15:13:54 -0400370
371 if (entry)
372 return entry;
373
374 /*
375 * Nothing found, go back a hash bucket
376 */
377 put_hash_bucket(*bucket, flags);
378 range += (1 << HASH_FN_SHIFT);
379 index.dev_addr -= (1 << HASH_FN_SHIFT);
380 *bucket = get_hash_bucket(&index, flags);
381 }
382
383 return NULL;
384}
385
Joerg Roedel30dfa902009-01-09 12:34:49 +0100386/*
387 * Add an entry to a hash bucket
388 */
389static void hash_bucket_add(struct hash_bucket *bucket,
390 struct dma_debug_entry *entry)
391{
392 list_add_tail(&entry->list, &bucket->list);
393}
394
395/*
396 * Remove entry from a hash bucket list
397 */
398static void hash_bucket_del(struct dma_debug_entry *entry)
399{
400 list_del(&entry->list);
401}
402
Dan Williams0abdd7a2014-01-21 15:48:12 -0800403static unsigned long long phys_addr(struct dma_debug_entry *entry)
404{
Niklas Söderlund0e74b342016-08-10 13:22:15 +0200405 if (entry->type == dma_debug_resource)
406 return __pfn_to_phys(entry->pfn) + entry->offset;
407
Dan Williams0abdd7a2014-01-21 15:48:12 -0800408 return page_to_phys(pfn_to_page(entry->pfn)) + entry->offset;
409}
410
Joerg Roedel30dfa902009-01-09 12:34:49 +0100411/*
David Woodhouseac26c182009-02-12 16:19:13 +0100412 * Dump mapping entries for debugging purposes
413 */
414void debug_dma_dump_mappings(struct device *dev)
415{
416 int idx;
417
418 for (idx = 0; idx < HASH_SIZE; idx++) {
419 struct hash_bucket *bucket = &dma_entry_hash[idx];
420 struct dma_debug_entry *entry;
421 unsigned long flags;
422
423 spin_lock_irqsave(&bucket->lock, flags);
424
425 list_for_each_entry(entry, &bucket->list, list) {
426 if (!dev || dev == entry->dev) {
427 dev_info(entry->dev,
Dan Williams0abdd7a2014-01-21 15:48:12 -0800428 "%s idx %d P=%Lx N=%lx D=%Lx L=%Lx %s %s\n",
David Woodhouseac26c182009-02-12 16:19:13 +0100429 type2name[entry->type], idx,
Dan Williams0abdd7a2014-01-21 15:48:12 -0800430 phys_addr(entry), entry->pfn,
David Woodhouseac26c182009-02-12 16:19:13 +0100431 entry->dev_addr, entry->size,
Shuah Khan6c9c6d62012-10-08 11:08:06 -0600432 dir2name[entry->direction],
433 maperr2str[entry->map_err_type]);
David Woodhouseac26c182009-02-12 16:19:13 +0100434 }
435 }
436
437 spin_unlock_irqrestore(&bucket->lock, flags);
438 }
439}
440EXPORT_SYMBOL(debug_dma_dump_mappings);
441
442/*
Dan Williams3b7a6412014-03-03 15:38:21 -0800443 * For each mapping (initial cacheline in the case of
444 * dma_alloc_coherent/dma_map_page, initial cacheline in each page of a
445 * scatterlist, or the cacheline specified in dma_map_single) insert
446 * into this tree using the cacheline as the key. At
Dan Williams0abdd7a2014-01-21 15:48:12 -0800447 * dma_unmap_{single|sg|page} or dma_free_coherent delete the entry. If
Dan Williams3b7a6412014-03-03 15:38:21 -0800448 * the entry already exists at insertion time add a tag as a reference
Dan Williams0abdd7a2014-01-21 15:48:12 -0800449 * count for the overlapping mappings. For now, the overlap tracking
Dan Williams3b7a6412014-03-03 15:38:21 -0800450 * just ensures that 'unmaps' balance 'maps' before marking the
451 * cacheline idle, but we should also be flagging overlaps as an API
452 * violation.
Dan Williams0abdd7a2014-01-21 15:48:12 -0800453 *
454 * Memory usage is mostly constrained by the maximum number of available
455 * dma-debug entries in that we need a free dma_debug_entry before
Dan Williams3b7a6412014-03-03 15:38:21 -0800456 * inserting into the tree. In the case of dma_map_page and
457 * dma_alloc_coherent there is only one dma_debug_entry and one
458 * dma_active_cacheline entry to track per event. dma_map_sg(), on the
459 * other hand, consumes a single dma_debug_entry, but inserts 'nents'
460 * entries into the tree.
Dan Williams0abdd7a2014-01-21 15:48:12 -0800461 *
462 * At any time debug_dma_assert_idle() can be called to trigger a
Dan Williams3b7a6412014-03-03 15:38:21 -0800463 * warning if any cachelines in the given page are in the active set.
Dan Williams0abdd7a2014-01-21 15:48:12 -0800464 */
Dan Williams3b7a6412014-03-03 15:38:21 -0800465static RADIX_TREE(dma_active_cacheline, GFP_NOWAIT);
Dan Williams0abdd7a2014-01-21 15:48:12 -0800466static DEFINE_SPINLOCK(radix_lock);
Dan Williams3b7a6412014-03-03 15:38:21 -0800467#define ACTIVE_CACHELINE_MAX_OVERLAP ((1 << RADIX_TREE_MAX_TAGS) - 1)
468#define CACHELINE_PER_PAGE_SHIFT (PAGE_SHIFT - L1_CACHE_SHIFT)
469#define CACHELINES_PER_PAGE (1 << CACHELINE_PER_PAGE_SHIFT)
Dan Williams0abdd7a2014-01-21 15:48:12 -0800470
Dan Williams3b7a6412014-03-03 15:38:21 -0800471static phys_addr_t to_cacheline_number(struct dma_debug_entry *entry)
472{
473 return (entry->pfn << CACHELINE_PER_PAGE_SHIFT) +
474 (entry->offset >> L1_CACHE_SHIFT);
475}
476
477static int active_cacheline_read_overlap(phys_addr_t cln)
Dan Williams0abdd7a2014-01-21 15:48:12 -0800478{
479 int overlap = 0, i;
480
481 for (i = RADIX_TREE_MAX_TAGS - 1; i >= 0; i--)
Dan Williams3b7a6412014-03-03 15:38:21 -0800482 if (radix_tree_tag_get(&dma_active_cacheline, cln, i))
Dan Williams0abdd7a2014-01-21 15:48:12 -0800483 overlap |= 1 << i;
484 return overlap;
485}
486
Dan Williams3b7a6412014-03-03 15:38:21 -0800487static int active_cacheline_set_overlap(phys_addr_t cln, int overlap)
Dan Williams0abdd7a2014-01-21 15:48:12 -0800488{
489 int i;
490
Dan Williams3b7a6412014-03-03 15:38:21 -0800491 if (overlap > ACTIVE_CACHELINE_MAX_OVERLAP || overlap < 0)
Dan Williams59f2e7d2014-01-29 14:05:53 -0800492 return overlap;
Dan Williams0abdd7a2014-01-21 15:48:12 -0800493
494 for (i = RADIX_TREE_MAX_TAGS - 1; i >= 0; i--)
495 if (overlap & 1 << i)
Dan Williams3b7a6412014-03-03 15:38:21 -0800496 radix_tree_tag_set(&dma_active_cacheline, cln, i);
Dan Williams0abdd7a2014-01-21 15:48:12 -0800497 else
Dan Williams3b7a6412014-03-03 15:38:21 -0800498 radix_tree_tag_clear(&dma_active_cacheline, cln, i);
Dan Williams0abdd7a2014-01-21 15:48:12 -0800499
500 return overlap;
501}
502
Dan Williams3b7a6412014-03-03 15:38:21 -0800503static void active_cacheline_inc_overlap(phys_addr_t cln)
Dan Williams0abdd7a2014-01-21 15:48:12 -0800504{
Dan Williams3b7a6412014-03-03 15:38:21 -0800505 int overlap = active_cacheline_read_overlap(cln);
Dan Williams0abdd7a2014-01-21 15:48:12 -0800506
Dan Williams3b7a6412014-03-03 15:38:21 -0800507 overlap = active_cacheline_set_overlap(cln, ++overlap);
Dan Williams0abdd7a2014-01-21 15:48:12 -0800508
509 /* If we overflowed the overlap counter then we're potentially
510 * leaking dma-mappings. Otherwise, if maps and unmaps are
511 * balanced then this overflow may cause false negatives in
Dan Williams3b7a6412014-03-03 15:38:21 -0800512 * debug_dma_assert_idle() as the cacheline may be marked idle
Dan Williams0abdd7a2014-01-21 15:48:12 -0800513 * prematurely.
514 */
Dan Williams3b7a6412014-03-03 15:38:21 -0800515 WARN_ONCE(overlap > ACTIVE_CACHELINE_MAX_OVERLAP,
516 "DMA-API: exceeded %d overlapping mappings of cacheline %pa\n",
517 ACTIVE_CACHELINE_MAX_OVERLAP, &cln);
Dan Williams0abdd7a2014-01-21 15:48:12 -0800518}
519
Dan Williams3b7a6412014-03-03 15:38:21 -0800520static int active_cacheline_dec_overlap(phys_addr_t cln)
Dan Williams0abdd7a2014-01-21 15:48:12 -0800521{
Dan Williams3b7a6412014-03-03 15:38:21 -0800522 int overlap = active_cacheline_read_overlap(cln);
Dan Williams0abdd7a2014-01-21 15:48:12 -0800523
Dan Williams3b7a6412014-03-03 15:38:21 -0800524 return active_cacheline_set_overlap(cln, --overlap);
Dan Williams0abdd7a2014-01-21 15:48:12 -0800525}
526
Dan Williams3b7a6412014-03-03 15:38:21 -0800527static int active_cacheline_insert(struct dma_debug_entry *entry)
Dan Williams0abdd7a2014-01-21 15:48:12 -0800528{
Dan Williams3b7a6412014-03-03 15:38:21 -0800529 phys_addr_t cln = to_cacheline_number(entry);
Dan Williams0abdd7a2014-01-21 15:48:12 -0800530 unsigned long flags;
531 int rc;
532
Dan Williams3b7a6412014-03-03 15:38:21 -0800533 /* If the device is not writing memory then we don't have any
534 * concerns about the cpu consuming stale data. This mitigates
535 * legitimate usages of overlapping mappings.
536 */
537 if (entry->direction == DMA_TO_DEVICE)
538 return 0;
539
Dan Williams0abdd7a2014-01-21 15:48:12 -0800540 spin_lock_irqsave(&radix_lock, flags);
Dan Williams3b7a6412014-03-03 15:38:21 -0800541 rc = radix_tree_insert(&dma_active_cacheline, cln, entry);
Dan Williams0abdd7a2014-01-21 15:48:12 -0800542 if (rc == -EEXIST)
Dan Williams3b7a6412014-03-03 15:38:21 -0800543 active_cacheline_inc_overlap(cln);
Dan Williams0abdd7a2014-01-21 15:48:12 -0800544 spin_unlock_irqrestore(&radix_lock, flags);
545
546 return rc;
547}
548
Dan Williams3b7a6412014-03-03 15:38:21 -0800549static void active_cacheline_remove(struct dma_debug_entry *entry)
Dan Williams0abdd7a2014-01-21 15:48:12 -0800550{
Dan Williams3b7a6412014-03-03 15:38:21 -0800551 phys_addr_t cln = to_cacheline_number(entry);
Dan Williams0abdd7a2014-01-21 15:48:12 -0800552 unsigned long flags;
553
Dan Williams3b7a6412014-03-03 15:38:21 -0800554 /* ...mirror the insert case */
555 if (entry->direction == DMA_TO_DEVICE)
556 return;
557
Dan Williams0abdd7a2014-01-21 15:48:12 -0800558 spin_lock_irqsave(&radix_lock, flags);
Dan Williams59f2e7d2014-01-29 14:05:53 -0800559 /* since we are counting overlaps the final put of the
Dan Williams3b7a6412014-03-03 15:38:21 -0800560 * cacheline will occur when the overlap count is 0.
561 * active_cacheline_dec_overlap() returns -1 in that case
Dan Williams59f2e7d2014-01-29 14:05:53 -0800562 */
Dan Williams3b7a6412014-03-03 15:38:21 -0800563 if (active_cacheline_dec_overlap(cln) < 0)
564 radix_tree_delete(&dma_active_cacheline, cln);
Dan Williams0abdd7a2014-01-21 15:48:12 -0800565 spin_unlock_irqrestore(&radix_lock, flags);
566}
567
568/**
569 * debug_dma_assert_idle() - assert that a page is not undergoing dma
Dan Williams3b7a6412014-03-03 15:38:21 -0800570 * @page: page to lookup in the dma_active_cacheline tree
Dan Williams0abdd7a2014-01-21 15:48:12 -0800571 *
572 * Place a call to this routine in cases where the cpu touching the page
573 * before the dma completes (page is dma_unmapped) will lead to data
574 * corruption.
575 */
576void debug_dma_assert_idle(struct page *page)
577{
Dan Williams3b7a6412014-03-03 15:38:21 -0800578 static struct dma_debug_entry *ents[CACHELINES_PER_PAGE];
579 struct dma_debug_entry *entry = NULL;
580 void **results = (void **) &ents;
581 unsigned int nents, i;
Dan Williams0abdd7a2014-01-21 15:48:12 -0800582 unsigned long flags;
Dan Williams3b7a6412014-03-03 15:38:21 -0800583 phys_addr_t cln;
Dan Williams0abdd7a2014-01-21 15:48:12 -0800584
Haggai Eranc9d120b2015-07-17 16:24:06 -0700585 if (dma_debug_disabled())
586 return;
587
Dan Williams0abdd7a2014-01-21 15:48:12 -0800588 if (!page)
589 return;
590
Dan Williams3b7a6412014-03-03 15:38:21 -0800591 cln = (phys_addr_t) page_to_pfn(page) << CACHELINE_PER_PAGE_SHIFT;
Dan Williams0abdd7a2014-01-21 15:48:12 -0800592 spin_lock_irqsave(&radix_lock, flags);
Dan Williams3b7a6412014-03-03 15:38:21 -0800593 nents = radix_tree_gang_lookup(&dma_active_cacheline, results, cln,
594 CACHELINES_PER_PAGE);
595 for (i = 0; i < nents; i++) {
596 phys_addr_t ent_cln = to_cacheline_number(ents[i]);
597
598 if (ent_cln == cln) {
599 entry = ents[i];
600 break;
601 } else if (ent_cln >= cln + CACHELINES_PER_PAGE)
602 break;
603 }
Dan Williams0abdd7a2014-01-21 15:48:12 -0800604 spin_unlock_irqrestore(&radix_lock, flags);
605
606 if (!entry)
607 return;
608
Dan Williams3b7a6412014-03-03 15:38:21 -0800609 cln = to_cacheline_number(entry);
Dan Williams0abdd7a2014-01-21 15:48:12 -0800610 err_printk(entry->dev, entry,
Dan Williams3b7a6412014-03-03 15:38:21 -0800611 "DMA-API: cpu touching an active dma mapped cacheline [cln=%pa]\n",
612 &cln);
Dan Williams0abdd7a2014-01-21 15:48:12 -0800613}
614
615/*
Joerg Roedel30dfa902009-01-09 12:34:49 +0100616 * Wrapper function for adding an entry to the hash.
617 * This function takes care of locking itself.
618 */
619static void add_dma_entry(struct dma_debug_entry *entry)
620{
621 struct hash_bucket *bucket;
622 unsigned long flags;
Dan Williams0abdd7a2014-01-21 15:48:12 -0800623 int rc;
Joerg Roedel30dfa902009-01-09 12:34:49 +0100624
625 bucket = get_hash_bucket(entry, &flags);
626 hash_bucket_add(bucket, entry);
627 put_hash_bucket(bucket, &flags);
Dan Williams0abdd7a2014-01-21 15:48:12 -0800628
Dan Williams3b7a6412014-03-03 15:38:21 -0800629 rc = active_cacheline_insert(entry);
Dan Williams0abdd7a2014-01-21 15:48:12 -0800630 if (rc == -ENOMEM) {
Dan Williams3b7a6412014-03-03 15:38:21 -0800631 pr_err("DMA-API: cacheline tracking ENOMEM, dma-debug disabled\n");
Dan Williams0abdd7a2014-01-21 15:48:12 -0800632 global_disable = true;
633 }
634
635 /* TODO: report -EEXIST errors here as overlapping mappings are
636 * not supported by the DMA API
637 */
Joerg Roedel30dfa902009-01-09 12:34:49 +0100638}
639
FUJITA Tomonorie6a1a892009-04-15 18:22:41 +0900640static struct dma_debug_entry *__dma_entry_alloc(void)
641{
642 struct dma_debug_entry *entry;
643
644 entry = list_entry(free_entries.next, struct dma_debug_entry, list);
645 list_del(&entry->list);
646 memset(entry, 0, sizeof(*entry));
647
648 num_free_entries -= 1;
649 if (num_free_entries < min_free_entries)
650 min_free_entries = num_free_entries;
651
652 return entry;
653}
654
Joerg Roedel3b1e79e2009-01-09 12:42:46 +0100655/* struct dma_entry allocator
656 *
657 * The next two functions implement the allocator for
658 * struct dma_debug_entries.
659 */
660static struct dma_debug_entry *dma_entry_alloc(void)
661{
Jakub Kicinski29cdd4e2012-04-04 03:19:10 +0200662 struct dma_debug_entry *entry;
Joerg Roedel3b1e79e2009-01-09 12:42:46 +0100663 unsigned long flags;
664
665 spin_lock_irqsave(&free_entries_lock, flags);
666
667 if (list_empty(&free_entries)) {
Joerg Roedel3b1e79e2009-01-09 12:42:46 +0100668 global_disable = true;
Jakub Kicinski29cdd4e2012-04-04 03:19:10 +0200669 spin_unlock_irqrestore(&free_entries_lock, flags);
Ville Syrjälä3017cd62016-05-26 15:16:25 -0700670 pr_err("DMA-API: debugging out of memory - disabling\n");
Jakub Kicinski29cdd4e2012-04-04 03:19:10 +0200671 return NULL;
Joerg Roedel3b1e79e2009-01-09 12:42:46 +0100672 }
673
FUJITA Tomonorie6a1a892009-04-15 18:22:41 +0900674 entry = __dma_entry_alloc();
Joerg Roedel3b1e79e2009-01-09 12:42:46 +0100675
Jakub Kicinski29cdd4e2012-04-04 03:19:10 +0200676 spin_unlock_irqrestore(&free_entries_lock, flags);
677
David Woodhouse6c132d12009-01-19 16:52:39 +0100678#ifdef CONFIG_STACKTRACE
679 entry->stacktrace.max_entries = DMA_DEBUG_STACKTRACE_ENTRIES;
680 entry->stacktrace.entries = entry->st_entries;
681 entry->stacktrace.skip = 2;
682 save_stack_trace(&entry->stacktrace);
683#endif
Joerg Roedel3b1e79e2009-01-09 12:42:46 +0100684
Joerg Roedel3b1e79e2009-01-09 12:42:46 +0100685 return entry;
686}
687
688static void dma_entry_free(struct dma_debug_entry *entry)
689{
690 unsigned long flags;
691
Dan Williams3b7a6412014-03-03 15:38:21 -0800692 active_cacheline_remove(entry);
Dan Williams0abdd7a2014-01-21 15:48:12 -0800693
Joerg Roedel3b1e79e2009-01-09 12:42:46 +0100694 /*
695 * add to beginning of the list - this way the entries are
696 * more likely cache hot when they are reallocated.
697 */
698 spin_lock_irqsave(&free_entries_lock, flags);
699 list_add(&entry->list, &free_entries);
700 num_free_entries += 1;
701 spin_unlock_irqrestore(&free_entries_lock, flags);
702}
703
FUJITA Tomonorie6a1a892009-04-15 18:22:41 +0900704int dma_debug_resize_entries(u32 num_entries)
705{
706 int i, delta, ret = 0;
707 unsigned long flags;
708 struct dma_debug_entry *entry;
709 LIST_HEAD(tmp);
710
711 spin_lock_irqsave(&free_entries_lock, flags);
712
713 if (nr_total_entries < num_entries) {
714 delta = num_entries - nr_total_entries;
715
716 spin_unlock_irqrestore(&free_entries_lock, flags);
717
718 for (i = 0; i < delta; i++) {
719 entry = kzalloc(sizeof(*entry), GFP_KERNEL);
720 if (!entry)
721 break;
722
723 list_add_tail(&entry->list, &tmp);
724 }
725
726 spin_lock_irqsave(&free_entries_lock, flags);
727
728 list_splice(&tmp, &free_entries);
729 nr_total_entries += i;
730 num_free_entries += i;
731 } else {
732 delta = nr_total_entries - num_entries;
733
734 for (i = 0; i < delta && !list_empty(&free_entries); i++) {
735 entry = __dma_entry_alloc();
736 kfree(entry);
737 }
738
739 nr_total_entries -= i;
740 }
741
742 if (nr_total_entries != num_entries)
743 ret = 1;
744
745 spin_unlock_irqrestore(&free_entries_lock, flags);
746
747 return ret;
748}
749EXPORT_SYMBOL(dma_debug_resize_entries);
750
Joerg Roedel6bf07872009-01-09 12:54:42 +0100751/*
752 * DMA-API debugging init code
753 *
754 * The init code does two things:
755 * 1. Initialize core data structures
756 * 2. Preallocate a given number of dma_debug_entry structs
757 */
758
759static int prealloc_memory(u32 num_entries)
760{
761 struct dma_debug_entry *entry, *next_entry;
762 int i;
763
764 for (i = 0; i < num_entries; ++i) {
765 entry = kzalloc(sizeof(*entry), GFP_KERNEL);
766 if (!entry)
767 goto out_err;
768
769 list_add_tail(&entry->list, &free_entries);
770 }
771
772 num_free_entries = num_entries;
773 min_free_entries = num_entries;
774
Joerg Roedele7ed70e2009-06-08 15:39:24 +0200775 pr_info("DMA-API: preallocated %d debug entries\n", num_entries);
Joerg Roedel6bf07872009-01-09 12:54:42 +0100776
777 return 0;
778
779out_err:
780
781 list_for_each_entry_safe(entry, next_entry, &free_entries, list) {
782 list_del(&entry->list);
783 kfree(entry);
784 }
785
786 return -ENOMEM;
787}
788
Joerg Roedel8a6fc702009-05-22 21:23:13 +0200789static ssize_t filter_read(struct file *file, char __user *user_buf,
790 size_t count, loff_t *ppos)
791{
Joerg Roedel8a6fc702009-05-22 21:23:13 +0200792 char buf[NAME_MAX_LEN + 1];
Joerg Roedelc17e2cf2009-06-08 15:19:29 +0200793 unsigned long flags;
Joerg Roedel8a6fc702009-05-22 21:23:13 +0200794 int len;
795
796 if (!current_driver_name[0])
797 return 0;
798
799 /*
800 * We can't copy to userspace directly because current_driver_name can
801 * only be read under the driver_name_lock with irqs disabled. So
802 * create a temporary copy first.
803 */
804 read_lock_irqsave(&driver_name_lock, flags);
805 len = scnprintf(buf, NAME_MAX_LEN + 1, "%s\n", current_driver_name);
806 read_unlock_irqrestore(&driver_name_lock, flags);
807
808 return simple_read_from_buffer(user_buf, count, ppos, buf, len);
809}
810
811static ssize_t filter_write(struct file *file, const char __user *userbuf,
812 size_t count, loff_t *ppos)
813{
Joerg Roedel8a6fc702009-05-22 21:23:13 +0200814 char buf[NAME_MAX_LEN];
Joerg Roedelc17e2cf2009-06-08 15:19:29 +0200815 unsigned long flags;
816 size_t len;
Joerg Roedel8a6fc702009-05-22 21:23:13 +0200817 int i;
818
819 /*
820 * We can't copy from userspace directly. Access to
821 * current_driver_name is protected with a write_lock with irqs
822 * disabled. Since copy_from_user can fault and may sleep we
823 * need to copy to temporary buffer first
824 */
Joerg Roedele7ed70e2009-06-08 15:39:24 +0200825 len = min(count, (size_t)(NAME_MAX_LEN - 1));
Joerg Roedel8a6fc702009-05-22 21:23:13 +0200826 if (copy_from_user(buf, userbuf, len))
827 return -EFAULT;
828
829 buf[len] = 0;
830
831 write_lock_irqsave(&driver_name_lock, flags);
832
Joerg Roedel312325092009-06-08 15:07:08 +0200833 /*
834 * Now handle the string we got from userspace very carefully.
Joerg Roedel8a6fc702009-05-22 21:23:13 +0200835 * The rules are:
836 * - only use the first token we got
837 * - token delimiter is everything looking like a space
838 * character (' ', '\n', '\t' ...)
839 *
840 */
841 if (!isalnum(buf[0])) {
842 /*
Joerg Roedel312325092009-06-08 15:07:08 +0200843 * If the first character userspace gave us is not
Joerg Roedel8a6fc702009-05-22 21:23:13 +0200844 * alphanumerical then assume the filter should be
845 * switched off.
846 */
847 if (current_driver_name[0])
Joerg Roedele7ed70e2009-06-08 15:39:24 +0200848 pr_info("DMA-API: switching off dma-debug driver filter\n");
Joerg Roedel8a6fc702009-05-22 21:23:13 +0200849 current_driver_name[0] = 0;
850 current_driver = NULL;
851 goto out_unlock;
852 }
853
854 /*
855 * Now parse out the first token and use it as the name for the
856 * driver to filter for.
857 */
Dan Carpenter39a37ce2010-04-06 19:45:12 +0300858 for (i = 0; i < NAME_MAX_LEN - 1; ++i) {
Joerg Roedel8a6fc702009-05-22 21:23:13 +0200859 current_driver_name[i] = buf[i];
860 if (isspace(buf[i]) || buf[i] == ' ' || buf[i] == 0)
861 break;
862 }
863 current_driver_name[i] = 0;
864 current_driver = NULL;
865
Joerg Roedele7ed70e2009-06-08 15:39:24 +0200866 pr_info("DMA-API: enable driver filter for driver [%s]\n",
867 current_driver_name);
Joerg Roedel8a6fc702009-05-22 21:23:13 +0200868
869out_unlock:
870 write_unlock_irqrestore(&driver_name_lock, flags);
871
872 return count;
873}
874
Thiago Farinaaeb583d2010-01-18 18:57:33 -0500875static const struct file_operations filter_fops = {
Joerg Roedel8a6fc702009-05-22 21:23:13 +0200876 .read = filter_read,
877 .write = filter_write,
Arnd Bergmann6038f372010-08-15 18:52:59 +0200878 .llseek = default_llseek,
Joerg Roedel8a6fc702009-05-22 21:23:13 +0200879};
880
Joerg Roedel788dcfa2009-01-09 13:13:27 +0100881static int dma_debug_fs_init(void)
882{
883 dma_debug_dent = debugfs_create_dir("dma-api", NULL);
884 if (!dma_debug_dent) {
Joerg Roedele7ed70e2009-06-08 15:39:24 +0200885 pr_err("DMA-API: can not create debugfs directory\n");
Joerg Roedel788dcfa2009-01-09 13:13:27 +0100886 return -ENOMEM;
887 }
888
889 global_disable_dent = debugfs_create_bool("disabled", 0444,
890 dma_debug_dent,
Dan Carpenter68ee6d22012-06-27 12:08:55 +0300891 &global_disable);
Joerg Roedel788dcfa2009-01-09 13:13:27 +0100892 if (!global_disable_dent)
893 goto out_err;
894
895 error_count_dent = debugfs_create_u32("error_count", 0444,
896 dma_debug_dent, &error_count);
897 if (!error_count_dent)
898 goto out_err;
899
900 show_all_errors_dent = debugfs_create_u32("all_errors", 0644,
901 dma_debug_dent,
902 &show_all_errors);
903 if (!show_all_errors_dent)
904 goto out_err;
905
906 show_num_errors_dent = debugfs_create_u32("num_errors", 0644,
907 dma_debug_dent,
908 &show_num_errors);
909 if (!show_num_errors_dent)
910 goto out_err;
911
912 num_free_entries_dent = debugfs_create_u32("num_free_entries", 0444,
913 dma_debug_dent,
914 &num_free_entries);
915 if (!num_free_entries_dent)
916 goto out_err;
917
918 min_free_entries_dent = debugfs_create_u32("min_free_entries", 0444,
919 dma_debug_dent,
920 &min_free_entries);
921 if (!min_free_entries_dent)
922 goto out_err;
923
Joerg Roedel8a6fc702009-05-22 21:23:13 +0200924 filter_dent = debugfs_create_file("driver_filter", 0644,
925 dma_debug_dent, NULL, &filter_fops);
926 if (!filter_dent)
927 goto out_err;
928
Joerg Roedel788dcfa2009-01-09 13:13:27 +0100929 return 0;
930
931out_err:
932 debugfs_remove_recursive(dma_debug_dent);
933
934 return -ENOMEM;
935}
936
Stanislaw Gruszkaba4b87ad2011-03-31 08:08:09 -0400937static int device_dma_allocations(struct device *dev, struct dma_debug_entry **out_entry)
Joerg Roedeled888ae2009-05-22 17:16:04 +0200938{
939 struct dma_debug_entry *entry;
940 unsigned long flags;
941 int count = 0, i;
942
Joerg Roedelbe81c6e2009-06-08 15:46:19 +0200943 local_irq_save(flags);
944
Joerg Roedeled888ae2009-05-22 17:16:04 +0200945 for (i = 0; i < HASH_SIZE; ++i) {
Joerg Roedelbe81c6e2009-06-08 15:46:19 +0200946 spin_lock(&dma_entry_hash[i].lock);
Joerg Roedeled888ae2009-05-22 17:16:04 +0200947 list_for_each_entry(entry, &dma_entry_hash[i].list, list) {
Stanislaw Gruszkaba4b87ad2011-03-31 08:08:09 -0400948 if (entry->dev == dev) {
Joerg Roedeled888ae2009-05-22 17:16:04 +0200949 count += 1;
Stanislaw Gruszkaba4b87ad2011-03-31 08:08:09 -0400950 *out_entry = entry;
951 }
Joerg Roedeled888ae2009-05-22 17:16:04 +0200952 }
Joerg Roedelbe81c6e2009-06-08 15:46:19 +0200953 spin_unlock(&dma_entry_hash[i].lock);
Joerg Roedeled888ae2009-05-22 17:16:04 +0200954 }
955
Joerg Roedelbe81c6e2009-06-08 15:46:19 +0200956 local_irq_restore(flags);
957
Joerg Roedeled888ae2009-05-22 17:16:04 +0200958 return count;
959}
960
Ingo Molnara8fe9ea2009-12-31 15:16:23 +0100961static int dma_debug_device_change(struct notifier_block *nb, unsigned long action, void *data)
Joerg Roedeled888ae2009-05-22 17:16:04 +0200962{
963 struct device *dev = data;
Stanislaw Gruszkaba4b87ad2011-03-31 08:08:09 -0400964 struct dma_debug_entry *uninitialized_var(entry);
Joerg Roedeled888ae2009-05-22 17:16:04 +0200965 int count;
966
Florian Fainelli01ce18b2014-12-10 15:41:23 -0800967 if (dma_debug_disabled())
Ingo Molnara8fe9ea2009-12-31 15:16:23 +0100968 return 0;
Joerg Roedeled888ae2009-05-22 17:16:04 +0200969
970 switch (action) {
971 case BUS_NOTIFY_UNBOUND_DRIVER:
Stanislaw Gruszkaba4b87ad2011-03-31 08:08:09 -0400972 count = device_dma_allocations(dev, &entry);
Joerg Roedeled888ae2009-05-22 17:16:04 +0200973 if (count == 0)
974 break;
Stanislaw Gruszkaba4b87ad2011-03-31 08:08:09 -0400975 err_printk(dev, entry, "DMA-API: device driver has pending "
Joerg Roedeled888ae2009-05-22 17:16:04 +0200976 "DMA allocations while released from device "
Stanislaw Gruszkaba4b87ad2011-03-31 08:08:09 -0400977 "[count=%d]\n"
978 "One of leaked entries details: "
979 "[device address=0x%016llx] [size=%llu bytes] "
980 "[mapped with %s] [mapped as %s]\n",
981 count, entry->dev_addr, entry->size,
982 dir2name[entry->direction], type2name[entry->type]);
Joerg Roedeled888ae2009-05-22 17:16:04 +0200983 break;
984 default:
985 break;
986 }
987
988 return 0;
989}
990
Joerg Roedel41531c82009-03-16 17:32:14 +0100991void dma_debug_add_bus(struct bus_type *bus)
992{
Joerg Roedeled888ae2009-05-22 17:16:04 +0200993 struct notifier_block *nb;
994
Florian Fainelli01ce18b2014-12-10 15:41:23 -0800995 if (dma_debug_disabled())
Shaun Ruffellf797d982009-12-17 18:00:36 -0600996 return;
997
Joerg Roedeled888ae2009-05-22 17:16:04 +0200998 nb = kzalloc(sizeof(struct notifier_block), GFP_KERNEL);
999 if (nb == NULL) {
Joerg Roedele7ed70e2009-06-08 15:39:24 +02001000 pr_err("dma_debug_add_bus: out of memory\n");
Joerg Roedeled888ae2009-05-22 17:16:04 +02001001 return;
1002 }
1003
1004 nb->notifier_call = dma_debug_device_change;
1005
1006 bus_register_notifier(bus, nb);
Joerg Roedel41531c82009-03-16 17:32:14 +01001007}
Joerg Roedel788dcfa2009-01-09 13:13:27 +01001008
Joerg Roedel6bf07872009-01-09 12:54:42 +01001009/*
1010 * Let the architectures decide how many entries should be preallocated.
1011 */
1012void dma_debug_init(u32 num_entries)
1013{
1014 int i;
1015
Florian Fainelli2ce8e7e2014-12-10 15:41:25 -08001016 /* Do not use dma_debug_initialized here, since we really want to be
1017 * called to set dma_debug_initialized
1018 */
1019 if (global_disable)
Joerg Roedel6bf07872009-01-09 12:54:42 +01001020 return;
1021
1022 for (i = 0; i < HASH_SIZE; ++i) {
1023 INIT_LIST_HEAD(&dma_entry_hash[i].list);
Ingo Molnarb0a5b832009-06-16 16:11:14 +02001024 spin_lock_init(&dma_entry_hash[i].lock);
Joerg Roedel6bf07872009-01-09 12:54:42 +01001025 }
1026
Joerg Roedel788dcfa2009-01-09 13:13:27 +01001027 if (dma_debug_fs_init() != 0) {
Joerg Roedele7ed70e2009-06-08 15:39:24 +02001028 pr_err("DMA-API: error creating debugfs entries - disabling\n");
Joerg Roedel788dcfa2009-01-09 13:13:27 +01001029 global_disable = true;
1030
1031 return;
1032 }
1033
Joerg Roedel59d3daa2009-01-09 13:01:56 +01001034 if (req_entries)
1035 num_entries = req_entries;
1036
Joerg Roedel6bf07872009-01-09 12:54:42 +01001037 if (prealloc_memory(num_entries) != 0) {
Joerg Roedele7ed70e2009-06-08 15:39:24 +02001038 pr_err("DMA-API: debugging out of memory error - disabled\n");
Joerg Roedel6bf07872009-01-09 12:54:42 +01001039 global_disable = true;
1040
1041 return;
1042 }
1043
FUJITA Tomonorie6a1a892009-04-15 18:22:41 +09001044 nr_total_entries = num_free_entries;
1045
Florian Fainelli2ce8e7e2014-12-10 15:41:25 -08001046 dma_debug_initialized = true;
1047
Joerg Roedele7ed70e2009-06-08 15:39:24 +02001048 pr_info("DMA-API: debugging enabled by kernel config\n");
Joerg Roedel6bf07872009-01-09 12:54:42 +01001049}
1050
Joerg Roedel59d3daa2009-01-09 13:01:56 +01001051static __init int dma_debug_cmdline(char *str)
1052{
1053 if (!str)
1054 return -EINVAL;
1055
1056 if (strncmp(str, "off", 3) == 0) {
Joerg Roedele7ed70e2009-06-08 15:39:24 +02001057 pr_info("DMA-API: debugging disabled on kernel command line\n");
Joerg Roedel59d3daa2009-01-09 13:01:56 +01001058 global_disable = true;
1059 }
1060
1061 return 0;
1062}
1063
1064static __init int dma_debug_entries_cmdline(char *str)
1065{
1066 int res;
1067
1068 if (!str)
1069 return -EINVAL;
1070
1071 res = get_option(&str, &req_entries);
1072
1073 if (!res)
1074 req_entries = 0;
1075
1076 return 0;
1077}
1078
1079__setup("dma_debug=", dma_debug_cmdline);
1080__setup("dma_debug_entries=", dma_debug_entries_cmdline);
1081
Joerg Roedel2d62ece2009-01-09 14:10:26 +01001082static void check_unmap(struct dma_debug_entry *ref)
1083{
1084 struct dma_debug_entry *entry;
1085 struct hash_bucket *bucket;
1086 unsigned long flags;
1087
Joerg Roedel2d62ece2009-01-09 14:10:26 +01001088 bucket = get_hash_bucket(ref, &flags);
Neil Hormanc6a21d02011-08-08 15:13:54 -04001089 entry = bucket_find_exact(bucket, ref);
Joerg Roedel2d62ece2009-01-09 14:10:26 +01001090
1091 if (!entry) {
Alexander Duyck8d640a52013-03-22 15:04:48 -07001092 /* must drop lock before calling dma_mapping_error */
1093 put_hash_bucket(bucket, &flags);
1094
Shuah Khanbfe0fb02012-11-03 17:00:07 -06001095 if (dma_mapping_error(ref->dev, ref->dev_addr)) {
1096 err_printk(ref->dev, NULL,
Alexander Duyck8d640a52013-03-22 15:04:48 -07001097 "DMA-API: device driver tries to free an "
1098 "invalid DMA memory address\n");
1099 } else {
1100 err_printk(ref->dev, NULL,
1101 "DMA-API: device driver tries to free DMA "
1102 "memory it has not allocated [device "
1103 "address=0x%016llx] [size=%llu bytes]\n",
1104 ref->dev_addr, ref->size);
Shuah Khanbfe0fb02012-11-03 17:00:07 -06001105 }
Alexander Duyck8d640a52013-03-22 15:04:48 -07001106 return;
Joerg Roedel2d62ece2009-01-09 14:10:26 +01001107 }
1108
1109 if (ref->size != entry->size) {
David Woodhouse6c132d12009-01-19 16:52:39 +01001110 err_printk(ref->dev, entry, "DMA-API: device driver frees "
Joerg Roedel2d62ece2009-01-09 14:10:26 +01001111 "DMA memory with different size "
1112 "[device address=0x%016llx] [map size=%llu bytes] "
1113 "[unmap size=%llu bytes]\n",
1114 ref->dev_addr, entry->size, ref->size);
1115 }
1116
1117 if (ref->type != entry->type) {
David Woodhouse6c132d12009-01-19 16:52:39 +01001118 err_printk(ref->dev, entry, "DMA-API: device driver frees "
Joerg Roedel2d62ece2009-01-09 14:10:26 +01001119 "DMA memory with wrong function "
1120 "[device address=0x%016llx] [size=%llu bytes] "
1121 "[mapped as %s] [unmapped as %s]\n",
1122 ref->dev_addr, ref->size,
1123 type2name[entry->type], type2name[ref->type]);
1124 } else if ((entry->type == dma_debug_coherent) &&
Dan Williams0abdd7a2014-01-21 15:48:12 -08001125 (phys_addr(ref) != phys_addr(entry))) {
David Woodhouse6c132d12009-01-19 16:52:39 +01001126 err_printk(ref->dev, entry, "DMA-API: device driver frees "
Joerg Roedel2d62ece2009-01-09 14:10:26 +01001127 "DMA memory with different CPU address "
1128 "[device address=0x%016llx] [size=%llu bytes] "
Joerg Roedel59a40e702009-10-29 16:25:50 +01001129 "[cpu alloc address=0x%016llx] "
1130 "[cpu free address=0x%016llx]",
Joerg Roedel2d62ece2009-01-09 14:10:26 +01001131 ref->dev_addr, ref->size,
Dan Williams0abdd7a2014-01-21 15:48:12 -08001132 phys_addr(entry),
1133 phys_addr(ref));
Joerg Roedel2d62ece2009-01-09 14:10:26 +01001134 }
1135
1136 if (ref->sg_call_ents && ref->type == dma_debug_sg &&
1137 ref->sg_call_ents != entry->sg_call_ents) {
David Woodhouse6c132d12009-01-19 16:52:39 +01001138 err_printk(ref->dev, entry, "DMA-API: device driver frees "
Joerg Roedel2d62ece2009-01-09 14:10:26 +01001139 "DMA sg list with different entry count "
1140 "[map count=%d] [unmap count=%d]\n",
1141 entry->sg_call_ents, ref->sg_call_ents);
1142 }
1143
1144 /*
1145 * This may be no bug in reality - but most implementations of the
1146 * DMA API don't handle this properly, so check for it here
1147 */
1148 if (ref->direction != entry->direction) {
David Woodhouse6c132d12009-01-19 16:52:39 +01001149 err_printk(ref->dev, entry, "DMA-API: device driver frees "
Joerg Roedel2d62ece2009-01-09 14:10:26 +01001150 "DMA memory with different direction "
1151 "[device address=0x%016llx] [size=%llu bytes] "
1152 "[mapped with %s] [unmapped with %s]\n",
1153 ref->dev_addr, ref->size,
1154 dir2name[entry->direction],
1155 dir2name[ref->direction]);
1156 }
1157
Shuah Khan6c9c6d62012-10-08 11:08:06 -06001158 if (entry->map_err_type == MAP_ERR_NOT_CHECKED) {
1159 err_printk(ref->dev, entry,
1160 "DMA-API: device driver failed to check map error"
1161 "[device address=0x%016llx] [size=%llu bytes] "
1162 "[mapped as %s]",
1163 ref->dev_addr, ref->size,
1164 type2name[entry->type]);
1165 }
1166
Joerg Roedel2d62ece2009-01-09 14:10:26 +01001167 hash_bucket_del(entry);
1168 dma_entry_free(entry);
1169
Joerg Roedel2d62ece2009-01-09 14:10:26 +01001170 put_hash_bucket(bucket, &flags);
1171}
1172
Andy Lutomirskib4a0f532016-08-11 02:35:22 -07001173static void check_for_stack(struct device *dev,
1174 struct page *page, size_t offset)
Joerg Roedel2d62ece2009-01-09 14:10:26 +01001175{
Andy Lutomirskib4a0f532016-08-11 02:35:22 -07001176 void *addr;
1177 struct vm_struct *stack_vm_area = task_stack_vm_area(current);
1178
1179 if (!stack_vm_area) {
1180 /* Stack is direct-mapped. */
1181 if (PageHighMem(page))
1182 return;
1183 addr = page_address(page) + offset;
1184 if (object_is_on_stack(addr))
1185 err_printk(dev, NULL, "DMA-API: device driver maps memory from stack [addr=%p]\n", addr);
1186 } else {
1187 /* Stack is vmalloced. */
1188 int i;
1189
1190 for (i = 0; i < stack_vm_area->nr_pages; i++) {
1191 if (page != stack_vm_area->pages[i])
1192 continue;
1193
1194 addr = (u8 *)current->stack + i * PAGE_SIZE + offset;
1195 err_printk(dev, NULL, "DMA-API: device driver maps memory from stack [probable addr=%p]\n", addr);
1196 break;
1197 }
1198 }
Joerg Roedel2d62ece2009-01-09 14:10:26 +01001199}
1200
Ingo Molnarf39d1b92009-07-10 21:38:02 +02001201static inline bool overlap(void *addr, unsigned long len, void *start, void *end)
Joerg Roedel2e34bde2009-03-16 16:51:55 +01001202{
Ingo Molnarf39d1b92009-07-10 21:38:02 +02001203 unsigned long a1 = (unsigned long)addr;
1204 unsigned long b1 = a1 + len;
1205 unsigned long a2 = (unsigned long)start;
1206 unsigned long b2 = (unsigned long)end;
Joerg Roedel2e34bde2009-03-16 16:51:55 +01001207
Ingo Molnarf39d1b92009-07-10 21:38:02 +02001208 return !(b1 <= a2 || a1 >= b2);
Joerg Roedel2e34bde2009-03-16 16:51:55 +01001209}
1210
Ingo Molnarf39d1b92009-07-10 21:38:02 +02001211static void check_for_illegal_area(struct device *dev, void *addr, unsigned long len)
Joerg Roedel2e34bde2009-03-16 16:51:55 +01001212{
Laura Abbottea535e42016-01-14 15:16:50 -08001213 if (overlap(addr, len, _stext, _etext) ||
Ingo Molnarf39d1b92009-07-10 21:38:02 +02001214 overlap(addr, len, __start_rodata, __end_rodata))
1215 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 +01001216}
1217
Joerg Roedelaa010ef2009-06-12 15:25:06 +02001218static void check_sync(struct device *dev,
1219 struct dma_debug_entry *ref,
1220 bool to_cpu)
Joerg Roedel2d62ece2009-01-09 14:10:26 +01001221{
Joerg Roedel2d62ece2009-01-09 14:10:26 +01001222 struct dma_debug_entry *entry;
1223 struct hash_bucket *bucket;
1224 unsigned long flags;
1225
Joerg Roedelaa010ef2009-06-12 15:25:06 +02001226 bucket = get_hash_bucket(ref, &flags);
Joerg Roedel2d62ece2009-01-09 14:10:26 +01001227
Neil Hormanc6a21d02011-08-08 15:13:54 -04001228 entry = bucket_find_contain(&bucket, ref, &flags);
Joerg Roedel2d62ece2009-01-09 14:10:26 +01001229
1230 if (!entry) {
David Woodhouse6c132d12009-01-19 16:52:39 +01001231 err_printk(dev, NULL, "DMA-API: device driver tries "
Joerg Roedel2d62ece2009-01-09 14:10:26 +01001232 "to sync DMA memory it has not allocated "
1233 "[device address=0x%016llx] [size=%llu bytes]\n",
Joerg Roedelaa010ef2009-06-12 15:25:06 +02001234 (unsigned long long)ref->dev_addr, ref->size);
Joerg Roedel2d62ece2009-01-09 14:10:26 +01001235 goto out;
1236 }
1237
Joerg Roedelaa010ef2009-06-12 15:25:06 +02001238 if (ref->size > entry->size) {
David Woodhouse6c132d12009-01-19 16:52:39 +01001239 err_printk(dev, entry, "DMA-API: device driver syncs"
Joerg Roedel2d62ece2009-01-09 14:10:26 +01001240 " DMA memory outside allocated range "
1241 "[device address=0x%016llx] "
Joerg Roedelaa010ef2009-06-12 15:25:06 +02001242 "[allocation size=%llu bytes] "
1243 "[sync offset+size=%llu]\n",
1244 entry->dev_addr, entry->size,
1245 ref->size);
Joerg Roedel2d62ece2009-01-09 14:10:26 +01001246 }
1247
Krzysztof Halasa42d53b42010-01-08 14:42:36 -08001248 if (entry->direction == DMA_BIDIRECTIONAL)
1249 goto out;
1250
Joerg Roedelaa010ef2009-06-12 15:25:06 +02001251 if (ref->direction != entry->direction) {
David Woodhouse6c132d12009-01-19 16:52:39 +01001252 err_printk(dev, entry, "DMA-API: device driver syncs "
Joerg Roedel2d62ece2009-01-09 14:10:26 +01001253 "DMA memory with different direction "
1254 "[device address=0x%016llx] [size=%llu bytes] "
1255 "[mapped with %s] [synced with %s]\n",
Joerg Roedelaa010ef2009-06-12 15:25:06 +02001256 (unsigned long long)ref->dev_addr, entry->size,
Joerg Roedel2d62ece2009-01-09 14:10:26 +01001257 dir2name[entry->direction],
Joerg Roedelaa010ef2009-06-12 15:25:06 +02001258 dir2name[ref->direction]);
Joerg Roedel2d62ece2009-01-09 14:10:26 +01001259 }
1260
Joerg Roedel2d62ece2009-01-09 14:10:26 +01001261 if (to_cpu && !(entry->direction == DMA_FROM_DEVICE) &&
Joerg Roedelaa010ef2009-06-12 15:25:06 +02001262 !(ref->direction == DMA_TO_DEVICE))
David Woodhouse6c132d12009-01-19 16:52:39 +01001263 err_printk(dev, entry, "DMA-API: device driver syncs "
Joerg Roedel2d62ece2009-01-09 14:10:26 +01001264 "device read-only DMA memory for cpu "
1265 "[device address=0x%016llx] [size=%llu bytes] "
1266 "[mapped with %s] [synced with %s]\n",
Joerg Roedelaa010ef2009-06-12 15:25:06 +02001267 (unsigned long long)ref->dev_addr, entry->size,
Joerg Roedel2d62ece2009-01-09 14:10:26 +01001268 dir2name[entry->direction],
Joerg Roedelaa010ef2009-06-12 15:25:06 +02001269 dir2name[ref->direction]);
Joerg Roedel2d62ece2009-01-09 14:10:26 +01001270
1271 if (!to_cpu && !(entry->direction == DMA_TO_DEVICE) &&
Joerg Roedelaa010ef2009-06-12 15:25:06 +02001272 !(ref->direction == DMA_FROM_DEVICE))
David Woodhouse6c132d12009-01-19 16:52:39 +01001273 err_printk(dev, entry, "DMA-API: device driver syncs "
Joerg Roedel2d62ece2009-01-09 14:10:26 +01001274 "device write-only DMA memory to device "
1275 "[device address=0x%016llx] [size=%llu bytes] "
1276 "[mapped with %s] [synced with %s]\n",
Joerg Roedelaa010ef2009-06-12 15:25:06 +02001277 (unsigned long long)ref->dev_addr, entry->size,
Joerg Roedel2d62ece2009-01-09 14:10:26 +01001278 dir2name[entry->direction],
Joerg Roedelaa010ef2009-06-12 15:25:06 +02001279 dir2name[ref->direction]);
Joerg Roedel2d62ece2009-01-09 14:10:26 +01001280
Robin Murphy7f830642015-11-06 16:32:55 -08001281 if (ref->sg_call_ents && ref->type == dma_debug_sg &&
1282 ref->sg_call_ents != entry->sg_call_ents) {
1283 err_printk(ref->dev, entry, "DMA-API: device driver syncs "
1284 "DMA sg list with different entry count "
1285 "[map count=%d] [sync count=%d]\n",
1286 entry->sg_call_ents, ref->sg_call_ents);
1287 }
1288
Joerg Roedel2d62ece2009-01-09 14:10:26 +01001289out:
1290 put_hash_bucket(bucket, &flags);
Joerg Roedel2d62ece2009-01-09 14:10:26 +01001291}
1292
Joerg Roedelf62bc982009-01-09 14:14:49 +01001293void debug_dma_map_page(struct device *dev, struct page *page, size_t offset,
1294 size_t size, int direction, dma_addr_t dma_addr,
1295 bool map_single)
1296{
1297 struct dma_debug_entry *entry;
1298
Florian Fainelli01ce18b2014-12-10 15:41:23 -08001299 if (unlikely(dma_debug_disabled()))
Joerg Roedelf62bc982009-01-09 14:14:49 +01001300 return;
1301
Shuah Khanbfe0fb02012-11-03 17:00:07 -06001302 if (dma_mapping_error(dev, dma_addr))
Joerg Roedelf62bc982009-01-09 14:14:49 +01001303 return;
1304
1305 entry = dma_entry_alloc();
1306 if (!entry)
1307 return;
1308
1309 entry->dev = dev;
1310 entry->type = dma_debug_page;
Dan Williams0abdd7a2014-01-21 15:48:12 -08001311 entry->pfn = page_to_pfn(page);
1312 entry->offset = offset,
Joerg Roedelf62bc982009-01-09 14:14:49 +01001313 entry->dev_addr = dma_addr;
1314 entry->size = size;
1315 entry->direction = direction;
Shuah Khan6c9c6d62012-10-08 11:08:06 -06001316 entry->map_err_type = MAP_ERR_NOT_CHECKED;
Joerg Roedelf62bc982009-01-09 14:14:49 +01001317
Joerg Roedel9537a482009-03-23 15:35:08 +01001318 if (map_single)
Joerg Roedelf62bc982009-01-09 14:14:49 +01001319 entry->type = dma_debug_single;
Joerg Roedel9537a482009-03-23 15:35:08 +01001320
Andy Lutomirskib4a0f532016-08-11 02:35:22 -07001321 check_for_stack(dev, page, offset);
1322
Joerg Roedel9537a482009-03-23 15:35:08 +01001323 if (!PageHighMem(page)) {
Ingo Molnarf39d1b92009-07-10 21:38:02 +02001324 void *addr = page_address(page) + offset;
1325
Joerg Roedel2e34bde2009-03-16 16:51:55 +01001326 check_for_illegal_area(dev, addr, size);
Joerg Roedelf62bc982009-01-09 14:14:49 +01001327 }
1328
1329 add_dma_entry(entry);
1330}
1331EXPORT_SYMBOL(debug_dma_map_page);
1332
Shuah Khan6c9c6d62012-10-08 11:08:06 -06001333void debug_dma_mapping_error(struct device *dev, dma_addr_t dma_addr)
1334{
1335 struct dma_debug_entry ref;
1336 struct dma_debug_entry *entry;
1337 struct hash_bucket *bucket;
1338 unsigned long flags;
1339
Florian Fainelli01ce18b2014-12-10 15:41:23 -08001340 if (unlikely(dma_debug_disabled()))
Shuah Khan6c9c6d62012-10-08 11:08:06 -06001341 return;
1342
1343 ref.dev = dev;
1344 ref.dev_addr = dma_addr;
1345 bucket = get_hash_bucket(&ref, &flags);
Shuah Khan6c9c6d62012-10-08 11:08:06 -06001346
Alexander Duyck96e7d7a2013-03-22 15:04:49 -07001347 list_for_each_entry(entry, &bucket->list, list) {
1348 if (!exact_match(&ref, entry))
1349 continue;
Shuah Khan6c9c6d62012-10-08 11:08:06 -06001350
Alexander Duyck96e7d7a2013-03-22 15:04:49 -07001351 /*
1352 * The same physical address can be mapped multiple
1353 * times. Without a hardware IOMMU this results in the
1354 * same device addresses being put into the dma-debug
1355 * hash multiple times too. This can result in false
1356 * positives being reported. Therefore we implement a
1357 * best-fit algorithm here which updates the first entry
1358 * from the hash which fits the reference value and is
1359 * not currently listed as being checked.
1360 */
1361 if (entry->map_err_type == MAP_ERR_NOT_CHECKED) {
1362 entry->map_err_type = MAP_ERR_CHECKED;
1363 break;
1364 }
1365 }
1366
Shuah Khan6c9c6d62012-10-08 11:08:06 -06001367 put_hash_bucket(bucket, &flags);
1368}
1369EXPORT_SYMBOL(debug_dma_mapping_error);
1370
Joerg Roedelf62bc982009-01-09 14:14:49 +01001371void debug_dma_unmap_page(struct device *dev, dma_addr_t addr,
1372 size_t size, int direction, bool map_single)
1373{
1374 struct dma_debug_entry ref = {
1375 .type = dma_debug_page,
1376 .dev = dev,
1377 .dev_addr = addr,
1378 .size = size,
1379 .direction = direction,
1380 };
1381
Florian Fainelli01ce18b2014-12-10 15:41:23 -08001382 if (unlikely(dma_debug_disabled()))
Joerg Roedelf62bc982009-01-09 14:14:49 +01001383 return;
1384
1385 if (map_single)
1386 ref.type = dma_debug_single;
1387
1388 check_unmap(&ref);
1389}
1390EXPORT_SYMBOL(debug_dma_unmap_page);
1391
Joerg Roedel972aa452009-01-09 14:19:54 +01001392void debug_dma_map_sg(struct device *dev, struct scatterlist *sg,
1393 int nents, int mapped_ents, int direction)
1394{
1395 struct dma_debug_entry *entry;
1396 struct scatterlist *s;
1397 int i;
1398
Florian Fainelli01ce18b2014-12-10 15:41:23 -08001399 if (unlikely(dma_debug_disabled()))
Joerg Roedel972aa452009-01-09 14:19:54 +01001400 return;
1401
1402 for_each_sg(sg, s, mapped_ents, i) {
1403 entry = dma_entry_alloc();
1404 if (!entry)
1405 return;
1406
1407 entry->type = dma_debug_sg;
1408 entry->dev = dev;
Dan Williams0abdd7a2014-01-21 15:48:12 -08001409 entry->pfn = page_to_pfn(sg_page(s));
1410 entry->offset = s->offset,
FUJITA Tomonori884d0592009-05-27 09:43:02 +09001411 entry->size = sg_dma_len(s);
FUJITA Tomonori15aedea42009-05-27 09:43:01 +09001412 entry->dev_addr = sg_dma_address(s);
Joerg Roedel972aa452009-01-09 14:19:54 +01001413 entry->direction = direction;
1414 entry->sg_call_ents = nents;
1415 entry->sg_mapped_ents = mapped_ents;
1416
Andy Lutomirskib4a0f532016-08-11 02:35:22 -07001417 check_for_stack(dev, sg_page(s), s->offset);
1418
Joerg Roedel9537a482009-03-23 15:35:08 +01001419 if (!PageHighMem(sg_page(s))) {
FUJITA Tomonori884d0592009-05-27 09:43:02 +09001420 check_for_illegal_area(dev, sg_virt(s), sg_dma_len(s));
Joerg Roedel9537a482009-03-23 15:35:08 +01001421 }
Joerg Roedel972aa452009-01-09 14:19:54 +01001422
1423 add_dma_entry(entry);
1424 }
1425}
1426EXPORT_SYMBOL(debug_dma_map_sg);
1427
Joerg Roedelaa010ef2009-06-12 15:25:06 +02001428static int get_nr_mapped_entries(struct device *dev,
1429 struct dma_debug_entry *ref)
FUJITA Tomonori88f39072009-05-27 09:43:03 +09001430{
Joerg Roedelaa010ef2009-06-12 15:25:06 +02001431 struct dma_debug_entry *entry;
FUJITA Tomonori88f39072009-05-27 09:43:03 +09001432 struct hash_bucket *bucket;
1433 unsigned long flags;
Joerg Roedelc17e2cf2009-06-08 15:19:29 +02001434 int mapped_ents;
FUJITA Tomonori88f39072009-05-27 09:43:03 +09001435
Joerg Roedelaa010ef2009-06-12 15:25:06 +02001436 bucket = get_hash_bucket(ref, &flags);
Neil Hormanc6a21d02011-08-08 15:13:54 -04001437 entry = bucket_find_exact(bucket, ref);
Joerg Roedelc17e2cf2009-06-08 15:19:29 +02001438 mapped_ents = 0;
1439
FUJITA Tomonori88f39072009-05-27 09:43:03 +09001440 if (entry)
1441 mapped_ents = entry->sg_mapped_ents;
1442 put_hash_bucket(bucket, &flags);
1443
1444 return mapped_ents;
1445}
1446
Joerg Roedel972aa452009-01-09 14:19:54 +01001447void debug_dma_unmap_sg(struct device *dev, struct scatterlist *sglist,
1448 int nelems, int dir)
1449{
Joerg Roedel972aa452009-01-09 14:19:54 +01001450 struct scatterlist *s;
1451 int mapped_ents = 0, i;
Joerg Roedel972aa452009-01-09 14:19:54 +01001452
Florian Fainelli01ce18b2014-12-10 15:41:23 -08001453 if (unlikely(dma_debug_disabled()))
Joerg Roedel972aa452009-01-09 14:19:54 +01001454 return;
1455
1456 for_each_sg(sglist, s, nelems, i) {
1457
1458 struct dma_debug_entry ref = {
1459 .type = dma_debug_sg,
1460 .dev = dev,
Dan Williams0abdd7a2014-01-21 15:48:12 -08001461 .pfn = page_to_pfn(sg_page(s)),
1462 .offset = s->offset,
FUJITA Tomonori15aedea42009-05-27 09:43:01 +09001463 .dev_addr = sg_dma_address(s),
FUJITA Tomonori884d0592009-05-27 09:43:02 +09001464 .size = sg_dma_len(s),
Joerg Roedel972aa452009-01-09 14:19:54 +01001465 .direction = dir,
Joerg Roedele5e8c5b2009-06-11 10:03:42 +02001466 .sg_call_ents = nelems,
Joerg Roedel972aa452009-01-09 14:19:54 +01001467 };
1468
1469 if (mapped_ents && i >= mapped_ents)
1470 break;
1471
Joerg Roedele5e8c5b2009-06-11 10:03:42 +02001472 if (!i)
Joerg Roedelaa010ef2009-06-12 15:25:06 +02001473 mapped_ents = get_nr_mapped_entries(dev, &ref);
Joerg Roedel972aa452009-01-09 14:19:54 +01001474
1475 check_unmap(&ref);
1476 }
1477}
1478EXPORT_SYMBOL(debug_dma_unmap_sg);
1479
Joerg Roedel6bfd4492009-01-09 14:38:50 +01001480void debug_dma_alloc_coherent(struct device *dev, size_t size,
1481 dma_addr_t dma_addr, void *virt)
1482{
1483 struct dma_debug_entry *entry;
1484
Florian Fainelli01ce18b2014-12-10 15:41:23 -08001485 if (unlikely(dma_debug_disabled()))
Joerg Roedel6bfd4492009-01-09 14:38:50 +01001486 return;
1487
1488 if (unlikely(virt == NULL))
1489 return;
1490
1491 entry = dma_entry_alloc();
1492 if (!entry)
1493 return;
1494
1495 entry->type = dma_debug_coherent;
1496 entry->dev = dev;
Dan Williams0abdd7a2014-01-21 15:48:12 -08001497 entry->pfn = page_to_pfn(virt_to_page(virt));
Daniel Mentz0354aec2015-12-15 17:38:48 -08001498 entry->offset = (size_t) virt & ~PAGE_MASK;
Joerg Roedel6bfd4492009-01-09 14:38:50 +01001499 entry->size = size;
1500 entry->dev_addr = dma_addr;
1501 entry->direction = DMA_BIDIRECTIONAL;
1502
1503 add_dma_entry(entry);
1504}
1505EXPORT_SYMBOL(debug_dma_alloc_coherent);
1506
1507void debug_dma_free_coherent(struct device *dev, size_t size,
1508 void *virt, dma_addr_t addr)
1509{
1510 struct dma_debug_entry ref = {
1511 .type = dma_debug_coherent,
1512 .dev = dev,
Dan Williams0abdd7a2014-01-21 15:48:12 -08001513 .pfn = page_to_pfn(virt_to_page(virt)),
Daniel Mentz0354aec2015-12-15 17:38:48 -08001514 .offset = (size_t) virt & ~PAGE_MASK,
Joerg Roedel6bfd4492009-01-09 14:38:50 +01001515 .dev_addr = addr,
1516 .size = size,
1517 .direction = DMA_BIDIRECTIONAL,
1518 };
1519
Florian Fainelli01ce18b2014-12-10 15:41:23 -08001520 if (unlikely(dma_debug_disabled()))
Joerg Roedel6bfd4492009-01-09 14:38:50 +01001521 return;
1522
1523 check_unmap(&ref);
1524}
1525EXPORT_SYMBOL(debug_dma_free_coherent);
1526
Niklas Söderlund0e74b342016-08-10 13:22:15 +02001527void debug_dma_map_resource(struct device *dev, phys_addr_t addr, size_t size,
1528 int direction, dma_addr_t dma_addr)
1529{
1530 struct dma_debug_entry *entry;
1531
1532 if (unlikely(dma_debug_disabled()))
1533 return;
1534
1535 entry = dma_entry_alloc();
1536 if (!entry)
1537 return;
1538
1539 entry->type = dma_debug_resource;
1540 entry->dev = dev;
Niklas Söderlund2e0cc302016-09-29 21:59:15 +02001541 entry->pfn = PHYS_PFN(addr);
Niklas Söderlund0e74b342016-08-10 13:22:15 +02001542 entry->offset = offset_in_page(addr);
1543 entry->size = size;
1544 entry->dev_addr = dma_addr;
1545 entry->direction = direction;
1546 entry->map_err_type = MAP_ERR_NOT_CHECKED;
1547
1548 add_dma_entry(entry);
1549}
1550EXPORT_SYMBOL(debug_dma_map_resource);
1551
1552void debug_dma_unmap_resource(struct device *dev, dma_addr_t dma_addr,
1553 size_t size, int direction)
1554{
1555 struct dma_debug_entry ref = {
1556 .type = dma_debug_resource,
1557 .dev = dev,
1558 .dev_addr = dma_addr,
1559 .size = size,
1560 .direction = direction,
1561 };
1562
1563 if (unlikely(dma_debug_disabled()))
1564 return;
1565
1566 check_unmap(&ref);
1567}
1568EXPORT_SYMBOL(debug_dma_unmap_resource);
1569
Joerg Roedelb9d23172009-01-09 14:43:04 +01001570void debug_dma_sync_single_for_cpu(struct device *dev, dma_addr_t dma_handle,
1571 size_t size, int direction)
1572{
Joerg Roedelaa010ef2009-06-12 15:25:06 +02001573 struct dma_debug_entry ref;
1574
Florian Fainelli01ce18b2014-12-10 15:41:23 -08001575 if (unlikely(dma_debug_disabled()))
Joerg Roedelb9d23172009-01-09 14:43:04 +01001576 return;
1577
Joerg Roedelaa010ef2009-06-12 15:25:06 +02001578 ref.type = dma_debug_single;
1579 ref.dev = dev;
1580 ref.dev_addr = dma_handle;
1581 ref.size = size;
1582 ref.direction = direction;
1583 ref.sg_call_ents = 0;
1584
1585 check_sync(dev, &ref, true);
Joerg Roedelb9d23172009-01-09 14:43:04 +01001586}
1587EXPORT_SYMBOL(debug_dma_sync_single_for_cpu);
1588
1589void debug_dma_sync_single_for_device(struct device *dev,
1590 dma_addr_t dma_handle, size_t size,
1591 int direction)
1592{
Joerg Roedelaa010ef2009-06-12 15:25:06 +02001593 struct dma_debug_entry ref;
1594
Florian Fainelli01ce18b2014-12-10 15:41:23 -08001595 if (unlikely(dma_debug_disabled()))
Joerg Roedelb9d23172009-01-09 14:43:04 +01001596 return;
1597
Joerg Roedelaa010ef2009-06-12 15:25:06 +02001598 ref.type = dma_debug_single;
1599 ref.dev = dev;
1600 ref.dev_addr = dma_handle;
1601 ref.size = size;
1602 ref.direction = direction;
1603 ref.sg_call_ents = 0;
1604
1605 check_sync(dev, &ref, false);
Joerg Roedelb9d23172009-01-09 14:43:04 +01001606}
1607EXPORT_SYMBOL(debug_dma_sync_single_for_device);
1608
Joerg Roedel948408b2009-01-09 14:55:38 +01001609void debug_dma_sync_single_range_for_cpu(struct device *dev,
1610 dma_addr_t dma_handle,
1611 unsigned long offset, size_t size,
1612 int direction)
1613{
Joerg Roedelaa010ef2009-06-12 15:25:06 +02001614 struct dma_debug_entry ref;
1615
Florian Fainelli01ce18b2014-12-10 15:41:23 -08001616 if (unlikely(dma_debug_disabled()))
Joerg Roedel948408b2009-01-09 14:55:38 +01001617 return;
1618
Joerg Roedelaa010ef2009-06-12 15:25:06 +02001619 ref.type = dma_debug_single;
1620 ref.dev = dev;
1621 ref.dev_addr = dma_handle;
1622 ref.size = offset + size;
1623 ref.direction = direction;
1624 ref.sg_call_ents = 0;
1625
1626 check_sync(dev, &ref, true);
Joerg Roedel948408b2009-01-09 14:55:38 +01001627}
1628EXPORT_SYMBOL(debug_dma_sync_single_range_for_cpu);
1629
1630void debug_dma_sync_single_range_for_device(struct device *dev,
1631 dma_addr_t dma_handle,
1632 unsigned long offset,
1633 size_t size, int direction)
1634{
Joerg Roedelaa010ef2009-06-12 15:25:06 +02001635 struct dma_debug_entry ref;
1636
Florian Fainelli01ce18b2014-12-10 15:41:23 -08001637 if (unlikely(dma_debug_disabled()))
Joerg Roedel948408b2009-01-09 14:55:38 +01001638 return;
1639
Joerg Roedelaa010ef2009-06-12 15:25:06 +02001640 ref.type = dma_debug_single;
1641 ref.dev = dev;
1642 ref.dev_addr = dma_handle;
1643 ref.size = offset + size;
1644 ref.direction = direction;
1645 ref.sg_call_ents = 0;
1646
1647 check_sync(dev, &ref, false);
Joerg Roedel948408b2009-01-09 14:55:38 +01001648}
1649EXPORT_SYMBOL(debug_dma_sync_single_range_for_device);
1650
Joerg Roedela31fba52009-01-09 15:01:12 +01001651void debug_dma_sync_sg_for_cpu(struct device *dev, struct scatterlist *sg,
1652 int nelems, int direction)
1653{
1654 struct scatterlist *s;
FUJITA Tomonori88f39072009-05-27 09:43:03 +09001655 int mapped_ents = 0, i;
Joerg Roedela31fba52009-01-09 15:01:12 +01001656
Florian Fainelli01ce18b2014-12-10 15:41:23 -08001657 if (unlikely(dma_debug_disabled()))
Joerg Roedela31fba52009-01-09 15:01:12 +01001658 return;
1659
1660 for_each_sg(sg, s, nelems, i) {
Joerg Roedelaa010ef2009-06-12 15:25:06 +02001661
1662 struct dma_debug_entry ref = {
1663 .type = dma_debug_sg,
1664 .dev = dev,
Dan Williams0abdd7a2014-01-21 15:48:12 -08001665 .pfn = page_to_pfn(sg_page(s)),
1666 .offset = s->offset,
Joerg Roedelaa010ef2009-06-12 15:25:06 +02001667 .dev_addr = sg_dma_address(s),
1668 .size = sg_dma_len(s),
1669 .direction = direction,
1670 .sg_call_ents = nelems,
1671 };
1672
FUJITA Tomonori88f39072009-05-27 09:43:03 +09001673 if (!i)
Joerg Roedelaa010ef2009-06-12 15:25:06 +02001674 mapped_ents = get_nr_mapped_entries(dev, &ref);
FUJITA Tomonori88f39072009-05-27 09:43:03 +09001675
1676 if (i >= mapped_ents)
1677 break;
1678
Joerg Roedelaa010ef2009-06-12 15:25:06 +02001679 check_sync(dev, &ref, true);
Joerg Roedela31fba52009-01-09 15:01:12 +01001680 }
1681}
1682EXPORT_SYMBOL(debug_dma_sync_sg_for_cpu);
1683
1684void debug_dma_sync_sg_for_device(struct device *dev, struct scatterlist *sg,
1685 int nelems, int direction)
1686{
1687 struct scatterlist *s;
FUJITA Tomonori88f39072009-05-27 09:43:03 +09001688 int mapped_ents = 0, i;
Joerg Roedela31fba52009-01-09 15:01:12 +01001689
Florian Fainelli01ce18b2014-12-10 15:41:23 -08001690 if (unlikely(dma_debug_disabled()))
Joerg Roedela31fba52009-01-09 15:01:12 +01001691 return;
1692
1693 for_each_sg(sg, s, nelems, i) {
Joerg Roedelaa010ef2009-06-12 15:25:06 +02001694
1695 struct dma_debug_entry ref = {
1696 .type = dma_debug_sg,
1697 .dev = dev,
Dan Williams0abdd7a2014-01-21 15:48:12 -08001698 .pfn = page_to_pfn(sg_page(s)),
1699 .offset = s->offset,
Joerg Roedelaa010ef2009-06-12 15:25:06 +02001700 .dev_addr = sg_dma_address(s),
1701 .size = sg_dma_len(s),
1702 .direction = direction,
1703 .sg_call_ents = nelems,
1704 };
FUJITA Tomonori88f39072009-05-27 09:43:03 +09001705 if (!i)
Joerg Roedelaa010ef2009-06-12 15:25:06 +02001706 mapped_ents = get_nr_mapped_entries(dev, &ref);
FUJITA Tomonori88f39072009-05-27 09:43:03 +09001707
1708 if (i >= mapped_ents)
1709 break;
1710
Joerg Roedelaa010ef2009-06-12 15:25:06 +02001711 check_sync(dev, &ref, false);
Joerg Roedela31fba52009-01-09 15:01:12 +01001712 }
1713}
1714EXPORT_SYMBOL(debug_dma_sync_sg_for_device);
1715
Joerg Roedel1745de52009-05-22 21:49:51 +02001716static int __init dma_debug_driver_setup(char *str)
1717{
1718 int i;
1719
1720 for (i = 0; i < NAME_MAX_LEN - 1; ++i, ++str) {
1721 current_driver_name[i] = *str;
1722 if (*str == 0)
1723 break;
1724 }
1725
1726 if (current_driver_name[0])
Joerg Roedele7ed70e2009-06-08 15:39:24 +02001727 pr_info("DMA-API: enable driver filter for driver [%s]\n",
1728 current_driver_name);
Joerg Roedel1745de52009-05-22 21:49:51 +02001729
1730
1731 return 1;
1732}
1733__setup("dma_debug_driver=", dma_debug_driver_setup);