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f2f45e5f JR |
1 | /* |
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 | ||
68db0cf1 | 20 | #include <linux/sched/task_stack.h> |
972aa45c | 21 | #include <linux/scatterlist.h> |
2d62ece1 | 22 | #include <linux/dma-mapping.h> |
29930025 | 23 | #include <linux/sched/task.h> |
6c132d1b | 24 | #include <linux/stacktrace.h> |
f2f45e5f | 25 | #include <linux/dma-debug.h> |
30dfa90c | 26 | #include <linux/spinlock.h> |
b4a0f533 | 27 | #include <linux/vmalloc.h> |
788dcfa6 | 28 | #include <linux/debugfs.h> |
8a6fc708 | 29 | #include <linux/uaccess.h> |
23a7bfae | 30 | #include <linux/export.h> |
2d62ece1 | 31 | #include <linux/device.h> |
f2f45e5f | 32 | #include <linux/types.h> |
2d62ece1 | 33 | #include <linux/sched.h> |
8a6fc708 | 34 | #include <linux/ctype.h> |
f2f45e5f | 35 | #include <linux/list.h> |
6bf07871 | 36 | #include <linux/slab.h> |
f2f45e5f | 37 | |
2e34bde1 JR |
38 | #include <asm/sections.h> |
39 | ||
30dfa90c JR |
40 | #define HASH_SIZE 1024ULL |
41 | #define HASH_FN_SHIFT 13 | |
42 | #define HASH_FN_MASK (HASH_SIZE - 1) | |
43 | ||
f2f45e5f JR |
44 | enum { |
45 | dma_debug_single, | |
46 | dma_debug_page, | |
47 | dma_debug_sg, | |
48 | dma_debug_coherent, | |
0e74b34d | 49 | dma_debug_resource, |
f2f45e5f JR |
50 | }; |
51 | ||
6c9c6d63 SK |
52 | enum map_err_types { |
53 | MAP_ERR_CHECK_NOT_APPLICABLE, | |
54 | MAP_ERR_NOT_CHECKED, | |
55 | MAP_ERR_CHECKED, | |
56 | }; | |
57 | ||
6c132d1b DW |
58 | #define DMA_DEBUG_STACKTRACE_ENTRIES 5 |
59 | ||
0abdd7a8 DW |
60 | /** |
61 | * struct dma_debug_entry - track a dma_map* or dma_alloc_coherent mapping | |
62 | * @list: node on pre-allocated free_entries list | |
63 | * @dev: 'dev' argument to dma_map_{page|single|sg} or dma_alloc_coherent | |
64 | * @type: single, page, sg, coherent | |
65 | * @pfn: page frame of the start address | |
66 | * @offset: offset of mapping relative to pfn | |
67 | * @size: length of the mapping | |
68 | * @direction: enum dma_data_direction | |
69 | * @sg_call_ents: 'nents' from dma_map_sg | |
70 | * @sg_mapped_ents: 'mapped_ents' from dma_map_sg | |
71 | * @map_err_type: track whether dma_mapping_error() was checked | |
72 | * @stacktrace: support backtraces when a violation is detected | |
73 | */ | |
f2f45e5f JR |
74 | struct dma_debug_entry { |
75 | struct list_head list; | |
76 | struct device *dev; | |
77 | int type; | |
0abdd7a8 DW |
78 | unsigned long pfn; |
79 | size_t offset; | |
f2f45e5f JR |
80 | u64 dev_addr; |
81 | u64 size; | |
82 | int direction; | |
83 | int sg_call_ents; | |
84 | int sg_mapped_ents; | |
6c9c6d63 | 85 | enum map_err_types map_err_type; |
6c132d1b DW |
86 | #ifdef CONFIG_STACKTRACE |
87 | struct stack_trace stacktrace; | |
88 | unsigned long st_entries[DMA_DEBUG_STACKTRACE_ENTRIES]; | |
89 | #endif | |
f2f45e5f JR |
90 | }; |
91 | ||
c6a21d0b NH |
92 | typedef bool (*match_fn)(struct dma_debug_entry *, struct dma_debug_entry *); |
93 | ||
30dfa90c JR |
94 | struct hash_bucket { |
95 | struct list_head list; | |
96 | spinlock_t lock; | |
2d62ece1 | 97 | } ____cacheline_aligned_in_smp; |
30dfa90c JR |
98 | |
99 | /* Hash list to save the allocated dma addresses */ | |
100 | static struct hash_bucket dma_entry_hash[HASH_SIZE]; | |
3b1e79ed JR |
101 | /* List of pre-allocated dma_debug_entry's */ |
102 | static LIST_HEAD(free_entries); | |
103 | /* Lock for the list above */ | |
104 | static DEFINE_SPINLOCK(free_entries_lock); | |
105 | ||
106 | /* Global disable flag - will be set in case of an error */ | |
621a5f7a | 107 | static bool global_disable __read_mostly; |
3b1e79ed | 108 | |
2ce8e7ed FF |
109 | /* Early initialization disable flag, set at the end of dma_debug_init */ |
110 | static bool dma_debug_initialized __read_mostly; | |
111 | ||
01ce18b3 FF |
112 | static inline bool dma_debug_disabled(void) |
113 | { | |
2ce8e7ed | 114 | return global_disable || !dma_debug_initialized; |
01ce18b3 FF |
115 | } |
116 | ||
788dcfa6 JR |
117 | /* Global error count */ |
118 | static u32 error_count; | |
119 | ||
120 | /* Global error show enable*/ | |
121 | static u32 show_all_errors __read_mostly; | |
122 | /* Number of errors to show */ | |
123 | static u32 show_num_errors = 1; | |
124 | ||
3b1e79ed JR |
125 | static u32 num_free_entries; |
126 | static u32 min_free_entries; | |
e6a1a89d | 127 | static u32 nr_total_entries; |
30dfa90c | 128 | |
59d3daaf JR |
129 | /* number of preallocated entries requested by kernel cmdline */ |
130 | static u32 req_entries; | |
131 | ||
788dcfa6 JR |
132 | /* debugfs dentry's for the stuff above */ |
133 | static struct dentry *dma_debug_dent __read_mostly; | |
134 | static struct dentry *global_disable_dent __read_mostly; | |
135 | static struct dentry *error_count_dent __read_mostly; | |
136 | static struct dentry *show_all_errors_dent __read_mostly; | |
137 | static struct dentry *show_num_errors_dent __read_mostly; | |
138 | static struct dentry *num_free_entries_dent __read_mostly; | |
139 | static struct dentry *min_free_entries_dent __read_mostly; | |
8a6fc708 | 140 | static struct dentry *filter_dent __read_mostly; |
788dcfa6 | 141 | |
2e507d84 JR |
142 | /* per-driver filter related state */ |
143 | ||
144 | #define NAME_MAX_LEN 64 | |
145 | ||
146 | static char current_driver_name[NAME_MAX_LEN] __read_mostly; | |
147 | static struct device_driver *current_driver __read_mostly; | |
148 | ||
149 | static DEFINE_RWLOCK(driver_name_lock); | |
788dcfa6 | 150 | |
6c9c6d63 SK |
151 | static const char *const maperr2str[] = { |
152 | [MAP_ERR_CHECK_NOT_APPLICABLE] = "dma map error check not applicable", | |
153 | [MAP_ERR_NOT_CHECKED] = "dma map error not checked", | |
154 | [MAP_ERR_CHECKED] = "dma map error checked", | |
155 | }; | |
156 | ||
0e74b34d NS |
157 | static const char *type2name[5] = { "single", "page", |
158 | "scather-gather", "coherent", | |
159 | "resource" }; | |
2d62ece1 JR |
160 | |
161 | static const char *dir2name[4] = { "DMA_BIDIRECTIONAL", "DMA_TO_DEVICE", | |
162 | "DMA_FROM_DEVICE", "DMA_NONE" }; | |
163 | ||
164 | /* | |
165 | * The access to some variables in this macro is racy. We can't use atomic_t | |
166 | * here because all these variables are exported to debugfs. Some of them even | |
167 | * writeable. This is also the reason why a lock won't help much. But anyway, | |
168 | * the races are no big deal. Here is why: | |
169 | * | |
170 | * error_count: the addition is racy, but the worst thing that can happen is | |
171 | * that we don't count some errors | |
172 | * show_num_errors: the subtraction is racy. Also no big deal because in | |
173 | * worst case this will result in one warning more in the | |
174 | * system log than the user configured. This variable is | |
175 | * writeable via debugfs. | |
176 | */ | |
6c132d1b DW |
177 | static inline void dump_entry_trace(struct dma_debug_entry *entry) |
178 | { | |
179 | #ifdef CONFIG_STACKTRACE | |
180 | if (entry) { | |
e7ed70ee | 181 | pr_warning("Mapped at:\n"); |
6c132d1b DW |
182 | print_stack_trace(&entry->stacktrace, 0); |
183 | } | |
184 | #endif | |
185 | } | |
186 | ||
2e507d84 JR |
187 | static bool driver_filter(struct device *dev) |
188 | { | |
0bf84128 JR |
189 | struct device_driver *drv; |
190 | unsigned long flags; | |
191 | bool ret; | |
192 | ||
2e507d84 JR |
193 | /* driver filter off */ |
194 | if (likely(!current_driver_name[0])) | |
195 | return true; | |
196 | ||
197 | /* driver filter on and initialized */ | |
ec9c96ef | 198 | if (current_driver && dev && dev->driver == current_driver) |
2e507d84 JR |
199 | return true; |
200 | ||
ec9c96ef KM |
201 | /* driver filter on, but we can't filter on a NULL device... */ |
202 | if (!dev) | |
203 | return false; | |
204 | ||
0bf84128 JR |
205 | if (current_driver || !current_driver_name[0]) |
206 | return false; | |
2e507d84 | 207 | |
0bf84128 | 208 | /* driver filter on but not yet initialized */ |
f3ff9247 | 209 | drv = dev->driver; |
0bf84128 JR |
210 | if (!drv) |
211 | return false; | |
212 | ||
213 | /* lock to protect against change of current_driver_name */ | |
214 | read_lock_irqsave(&driver_name_lock, flags); | |
215 | ||
216 | ret = false; | |
217 | if (drv->name && | |
218 | strncmp(current_driver_name, drv->name, NAME_MAX_LEN - 1) == 0) { | |
219 | current_driver = drv; | |
220 | ret = true; | |
2e507d84 JR |
221 | } |
222 | ||
0bf84128 | 223 | read_unlock_irqrestore(&driver_name_lock, flags); |
0bf84128 JR |
224 | |
225 | return ret; | |
2e507d84 JR |
226 | } |
227 | ||
ec9c96ef KM |
228 | #define err_printk(dev, entry, format, arg...) do { \ |
229 | error_count += 1; \ | |
230 | if (driver_filter(dev) && \ | |
231 | (show_all_errors || show_num_errors > 0)) { \ | |
232 | WARN(1, "%s %s: " format, \ | |
233 | dev ? dev_driver_string(dev) : "NULL", \ | |
234 | dev ? dev_name(dev) : "NULL", ## arg); \ | |
235 | dump_entry_trace(entry); \ | |
236 | } \ | |
237 | if (!show_all_errors && show_num_errors > 0) \ | |
238 | show_num_errors -= 1; \ | |
2d62ece1 JR |
239 | } while (0); |
240 | ||
30dfa90c JR |
241 | /* |
242 | * Hash related functions | |
243 | * | |
244 | * Every DMA-API request is saved into a struct dma_debug_entry. To | |
245 | * have quick access to these structs they are stored into a hash. | |
246 | */ | |
247 | static int hash_fn(struct dma_debug_entry *entry) | |
248 | { | |
249 | /* | |
250 | * Hash function is based on the dma address. | |
251 | * We use bits 20-27 here as the index into the hash | |
252 | */ | |
253 | return (entry->dev_addr >> HASH_FN_SHIFT) & HASH_FN_MASK; | |
254 | } | |
255 | ||
256 | /* | |
257 | * Request exclusive access to a hash bucket for a given dma_debug_entry. | |
258 | */ | |
259 | static struct hash_bucket *get_hash_bucket(struct dma_debug_entry *entry, | |
260 | unsigned long *flags) | |
d5dfc80f | 261 | __acquires(&dma_entry_hash[idx].lock) |
30dfa90c JR |
262 | { |
263 | int idx = hash_fn(entry); | |
264 | unsigned long __flags; | |
265 | ||
266 | spin_lock_irqsave(&dma_entry_hash[idx].lock, __flags); | |
267 | *flags = __flags; | |
268 | return &dma_entry_hash[idx]; | |
269 | } | |
270 | ||
271 | /* | |
272 | * Give up exclusive access to the hash bucket | |
273 | */ | |
274 | static void put_hash_bucket(struct hash_bucket *bucket, | |
275 | unsigned long *flags) | |
d5dfc80f | 276 | __releases(&bucket->lock) |
30dfa90c JR |
277 | { |
278 | unsigned long __flags = *flags; | |
279 | ||
280 | spin_unlock_irqrestore(&bucket->lock, __flags); | |
281 | } | |
282 | ||
c6a21d0b NH |
283 | static bool exact_match(struct dma_debug_entry *a, struct dma_debug_entry *b) |
284 | { | |
91ec37cc | 285 | return ((a->dev_addr == b->dev_addr) && |
c6a21d0b NH |
286 | (a->dev == b->dev)) ? true : false; |
287 | } | |
288 | ||
289 | static bool containing_match(struct dma_debug_entry *a, | |
290 | struct dma_debug_entry *b) | |
291 | { | |
292 | if (a->dev != b->dev) | |
293 | return false; | |
294 | ||
295 | if ((b->dev_addr <= a->dev_addr) && | |
296 | ((b->dev_addr + b->size) >= (a->dev_addr + a->size))) | |
297 | return true; | |
298 | ||
299 | return false; | |
300 | } | |
301 | ||
30dfa90c JR |
302 | /* |
303 | * Search a given entry in the hash bucket list | |
304 | */ | |
c6a21d0b NH |
305 | static struct dma_debug_entry *__hash_bucket_find(struct hash_bucket *bucket, |
306 | struct dma_debug_entry *ref, | |
307 | match_fn match) | |
30dfa90c | 308 | { |
7caf6a49 | 309 | struct dma_debug_entry *entry, *ret = NULL; |
fe73fbe1 | 310 | int matches = 0, match_lvl, last_lvl = -1; |
30dfa90c JR |
311 | |
312 | list_for_each_entry(entry, &bucket->list, list) { | |
c6a21d0b | 313 | if (!match(ref, entry)) |
7caf6a49 JR |
314 | continue; |
315 | ||
316 | /* | |
317 | * Some drivers map the same physical address multiple | |
318 | * times. Without a hardware IOMMU this results in the | |
319 | * same device addresses being put into the dma-debug | |
320 | * hash multiple times too. This can result in false | |
af901ca1 | 321 | * positives being reported. Therefore we implement a |
7caf6a49 JR |
322 | * best-fit algorithm here which returns the entry from |
323 | * the hash which fits best to the reference value | |
324 | * instead of the first-fit. | |
325 | */ | |
326 | matches += 1; | |
327 | match_lvl = 0; | |
e5e8c5b9 JR |
328 | entry->size == ref->size ? ++match_lvl : 0; |
329 | entry->type == ref->type ? ++match_lvl : 0; | |
330 | entry->direction == ref->direction ? ++match_lvl : 0; | |
331 | entry->sg_call_ents == ref->sg_call_ents ? ++match_lvl : 0; | |
7caf6a49 | 332 | |
e5e8c5b9 | 333 | if (match_lvl == 4) { |
7caf6a49 | 334 | /* perfect-fit - return the result */ |
30dfa90c | 335 | return entry; |
7caf6a49 JR |
336 | } else if (match_lvl > last_lvl) { |
337 | /* | |
338 | * We found an entry that fits better then the | |
fe73fbe1 | 339 | * previous one or it is the 1st match. |
7caf6a49 JR |
340 | */ |
341 | last_lvl = match_lvl; | |
342 | ret = entry; | |
343 | } | |
30dfa90c JR |
344 | } |
345 | ||
7caf6a49 JR |
346 | /* |
347 | * If we have multiple matches but no perfect-fit, just return | |
348 | * NULL. | |
349 | */ | |
350 | ret = (matches == 1) ? ret : NULL; | |
351 | ||
352 | return ret; | |
30dfa90c JR |
353 | } |
354 | ||
c6a21d0b NH |
355 | static struct dma_debug_entry *bucket_find_exact(struct hash_bucket *bucket, |
356 | struct dma_debug_entry *ref) | |
357 | { | |
358 | return __hash_bucket_find(bucket, ref, exact_match); | |
359 | } | |
360 | ||
361 | static struct dma_debug_entry *bucket_find_contain(struct hash_bucket **bucket, | |
362 | struct dma_debug_entry *ref, | |
363 | unsigned long *flags) | |
364 | { | |
365 | ||
366 | unsigned int max_range = dma_get_max_seg_size(ref->dev); | |
367 | struct dma_debug_entry *entry, index = *ref; | |
368 | unsigned int range = 0; | |
369 | ||
370 | while (range <= max_range) { | |
a7a2c02a | 371 | entry = __hash_bucket_find(*bucket, ref, containing_match); |
c6a21d0b NH |
372 | |
373 | if (entry) | |
374 | return entry; | |
375 | ||
376 | /* | |
377 | * Nothing found, go back a hash bucket | |
378 | */ | |
379 | put_hash_bucket(*bucket, flags); | |
380 | range += (1 << HASH_FN_SHIFT); | |
381 | index.dev_addr -= (1 << HASH_FN_SHIFT); | |
382 | *bucket = get_hash_bucket(&index, flags); | |
383 | } | |
384 | ||
385 | return NULL; | |
386 | } | |
387 | ||
30dfa90c JR |
388 | /* |
389 | * Add an entry to a hash bucket | |
390 | */ | |
391 | static void hash_bucket_add(struct hash_bucket *bucket, | |
392 | struct dma_debug_entry *entry) | |
393 | { | |
394 | list_add_tail(&entry->list, &bucket->list); | |
395 | } | |
396 | ||
397 | /* | |
398 | * Remove entry from a hash bucket list | |
399 | */ | |
400 | static void hash_bucket_del(struct dma_debug_entry *entry) | |
401 | { | |
402 | list_del(&entry->list); | |
403 | } | |
404 | ||
0abdd7a8 DW |
405 | static unsigned long long phys_addr(struct dma_debug_entry *entry) |
406 | { | |
0e74b34d NS |
407 | if (entry->type == dma_debug_resource) |
408 | return __pfn_to_phys(entry->pfn) + entry->offset; | |
409 | ||
0abdd7a8 DW |
410 | return page_to_phys(pfn_to_page(entry->pfn)) + entry->offset; |
411 | } | |
412 | ||
ac26c18b DW |
413 | /* |
414 | * Dump mapping entries for debugging purposes | |
415 | */ | |
416 | void debug_dma_dump_mappings(struct device *dev) | |
417 | { | |
418 | int idx; | |
419 | ||
420 | for (idx = 0; idx < HASH_SIZE; idx++) { | |
421 | struct hash_bucket *bucket = &dma_entry_hash[idx]; | |
422 | struct dma_debug_entry *entry; | |
423 | unsigned long flags; | |
424 | ||
425 | spin_lock_irqsave(&bucket->lock, flags); | |
426 | ||
427 | list_for_each_entry(entry, &bucket->list, list) { | |
428 | if (!dev || dev == entry->dev) { | |
429 | dev_info(entry->dev, | |
0abdd7a8 | 430 | "%s idx %d P=%Lx N=%lx D=%Lx L=%Lx %s %s\n", |
ac26c18b | 431 | type2name[entry->type], idx, |
0abdd7a8 | 432 | phys_addr(entry), entry->pfn, |
ac26c18b | 433 | entry->dev_addr, entry->size, |
6c9c6d63 SK |
434 | dir2name[entry->direction], |
435 | maperr2str[entry->map_err_type]); | |
ac26c18b DW |
436 | } |
437 | } | |
438 | ||
439 | spin_unlock_irqrestore(&bucket->lock, flags); | |
9eb447bb | 440 | cond_resched(); |
ac26c18b DW |
441 | } |
442 | } | |
443 | EXPORT_SYMBOL(debug_dma_dump_mappings); | |
444 | ||
0abdd7a8 | 445 | /* |
3b7a6418 DW |
446 | * For each mapping (initial cacheline in the case of |
447 | * dma_alloc_coherent/dma_map_page, initial cacheline in each page of a | |
448 | * scatterlist, or the cacheline specified in dma_map_single) insert | |
449 | * into this tree using the cacheline as the key. At | |
0abdd7a8 | 450 | * dma_unmap_{single|sg|page} or dma_free_coherent delete the entry. If |
3b7a6418 | 451 | * the entry already exists at insertion time add a tag as a reference |
0abdd7a8 | 452 | * count for the overlapping mappings. For now, the overlap tracking |
3b7a6418 DW |
453 | * just ensures that 'unmaps' balance 'maps' before marking the |
454 | * cacheline idle, but we should also be flagging overlaps as an API | |
455 | * violation. | |
0abdd7a8 DW |
456 | * |
457 | * Memory usage is mostly constrained by the maximum number of available | |
458 | * dma-debug entries in that we need a free dma_debug_entry before | |
3b7a6418 DW |
459 | * inserting into the tree. In the case of dma_map_page and |
460 | * dma_alloc_coherent there is only one dma_debug_entry and one | |
461 | * dma_active_cacheline entry to track per event. dma_map_sg(), on the | |
462 | * other hand, consumes a single dma_debug_entry, but inserts 'nents' | |
463 | * entries into the tree. | |
0abdd7a8 DW |
464 | * |
465 | * At any time debug_dma_assert_idle() can be called to trigger a | |
3b7a6418 | 466 | * warning if any cachelines in the given page are in the active set. |
0abdd7a8 | 467 | */ |
3b7a6418 | 468 | static RADIX_TREE(dma_active_cacheline, GFP_NOWAIT); |
0abdd7a8 | 469 | static DEFINE_SPINLOCK(radix_lock); |
3b7a6418 DW |
470 | #define ACTIVE_CACHELINE_MAX_OVERLAP ((1 << RADIX_TREE_MAX_TAGS) - 1) |
471 | #define CACHELINE_PER_PAGE_SHIFT (PAGE_SHIFT - L1_CACHE_SHIFT) | |
472 | #define CACHELINES_PER_PAGE (1 << CACHELINE_PER_PAGE_SHIFT) | |
0abdd7a8 | 473 | |
3b7a6418 DW |
474 | static phys_addr_t to_cacheline_number(struct dma_debug_entry *entry) |
475 | { | |
476 | return (entry->pfn << CACHELINE_PER_PAGE_SHIFT) + | |
477 | (entry->offset >> L1_CACHE_SHIFT); | |
478 | } | |
479 | ||
480 | static int active_cacheline_read_overlap(phys_addr_t cln) | |
0abdd7a8 DW |
481 | { |
482 | int overlap = 0, i; | |
483 | ||
484 | for (i = RADIX_TREE_MAX_TAGS - 1; i >= 0; i--) | |
3b7a6418 | 485 | if (radix_tree_tag_get(&dma_active_cacheline, cln, i)) |
0abdd7a8 DW |
486 | overlap |= 1 << i; |
487 | return overlap; | |
488 | } | |
489 | ||
3b7a6418 | 490 | static int active_cacheline_set_overlap(phys_addr_t cln, int overlap) |
0abdd7a8 DW |
491 | { |
492 | int i; | |
493 | ||
3b7a6418 | 494 | if (overlap > ACTIVE_CACHELINE_MAX_OVERLAP || overlap < 0) |
59f2e7df | 495 | return overlap; |
0abdd7a8 DW |
496 | |
497 | for (i = RADIX_TREE_MAX_TAGS - 1; i >= 0; i--) | |
498 | if (overlap & 1 << i) | |
3b7a6418 | 499 | radix_tree_tag_set(&dma_active_cacheline, cln, i); |
0abdd7a8 | 500 | else |
3b7a6418 | 501 | radix_tree_tag_clear(&dma_active_cacheline, cln, i); |
0abdd7a8 DW |
502 | |
503 | return overlap; | |
504 | } | |
505 | ||
3b7a6418 | 506 | static void active_cacheline_inc_overlap(phys_addr_t cln) |
0abdd7a8 | 507 | { |
3b7a6418 | 508 | int overlap = active_cacheline_read_overlap(cln); |
0abdd7a8 | 509 | |
3b7a6418 | 510 | overlap = active_cacheline_set_overlap(cln, ++overlap); |
0abdd7a8 DW |
511 | |
512 | /* If we overflowed the overlap counter then we're potentially | |
513 | * leaking dma-mappings. Otherwise, if maps and unmaps are | |
514 | * balanced then this overflow may cause false negatives in | |
3b7a6418 | 515 | * debug_dma_assert_idle() as the cacheline may be marked idle |
0abdd7a8 DW |
516 | * prematurely. |
517 | */ | |
3b7a6418 DW |
518 | WARN_ONCE(overlap > ACTIVE_CACHELINE_MAX_OVERLAP, |
519 | "DMA-API: exceeded %d overlapping mappings of cacheline %pa\n", | |
520 | ACTIVE_CACHELINE_MAX_OVERLAP, &cln); | |
0abdd7a8 DW |
521 | } |
522 | ||
3b7a6418 | 523 | static int active_cacheline_dec_overlap(phys_addr_t cln) |
0abdd7a8 | 524 | { |
3b7a6418 | 525 | int overlap = active_cacheline_read_overlap(cln); |
0abdd7a8 | 526 | |
3b7a6418 | 527 | return active_cacheline_set_overlap(cln, --overlap); |
0abdd7a8 DW |
528 | } |
529 | ||
3b7a6418 | 530 | static int active_cacheline_insert(struct dma_debug_entry *entry) |
0abdd7a8 | 531 | { |
3b7a6418 | 532 | phys_addr_t cln = to_cacheline_number(entry); |
0abdd7a8 DW |
533 | unsigned long flags; |
534 | int rc; | |
535 | ||
3b7a6418 DW |
536 | /* If the device is not writing memory then we don't have any |
537 | * concerns about the cpu consuming stale data. This mitigates | |
538 | * legitimate usages of overlapping mappings. | |
539 | */ | |
540 | if (entry->direction == DMA_TO_DEVICE) | |
541 | return 0; | |
542 | ||
0abdd7a8 | 543 | spin_lock_irqsave(&radix_lock, flags); |
3b7a6418 | 544 | rc = radix_tree_insert(&dma_active_cacheline, cln, entry); |
0abdd7a8 | 545 | if (rc == -EEXIST) |
3b7a6418 | 546 | active_cacheline_inc_overlap(cln); |
0abdd7a8 DW |
547 | spin_unlock_irqrestore(&radix_lock, flags); |
548 | ||
549 | return rc; | |
550 | } | |
551 | ||
3b7a6418 | 552 | static void active_cacheline_remove(struct dma_debug_entry *entry) |
0abdd7a8 | 553 | { |
3b7a6418 | 554 | phys_addr_t cln = to_cacheline_number(entry); |
0abdd7a8 DW |
555 | unsigned long flags; |
556 | ||
3b7a6418 DW |
557 | /* ...mirror the insert case */ |
558 | if (entry->direction == DMA_TO_DEVICE) | |
559 | return; | |
560 | ||
0abdd7a8 | 561 | spin_lock_irqsave(&radix_lock, flags); |
59f2e7df | 562 | /* since we are counting overlaps the final put of the |
3b7a6418 DW |
563 | * cacheline will occur when the overlap count is 0. |
564 | * active_cacheline_dec_overlap() returns -1 in that case | |
59f2e7df | 565 | */ |
3b7a6418 DW |
566 | if (active_cacheline_dec_overlap(cln) < 0) |
567 | radix_tree_delete(&dma_active_cacheline, cln); | |
0abdd7a8 DW |
568 | spin_unlock_irqrestore(&radix_lock, flags); |
569 | } | |
570 | ||
571 | /** | |
572 | * debug_dma_assert_idle() - assert that a page is not undergoing dma | |
3b7a6418 | 573 | * @page: page to lookup in the dma_active_cacheline tree |
0abdd7a8 DW |
574 | * |
575 | * Place a call to this routine in cases where the cpu touching the page | |
576 | * before the dma completes (page is dma_unmapped) will lead to data | |
577 | * corruption. | |
578 | */ | |
579 | void debug_dma_assert_idle(struct page *page) | |
580 | { | |
3b7a6418 DW |
581 | static struct dma_debug_entry *ents[CACHELINES_PER_PAGE]; |
582 | struct dma_debug_entry *entry = NULL; | |
583 | void **results = (void **) &ents; | |
584 | unsigned int nents, i; | |
0abdd7a8 | 585 | unsigned long flags; |
3b7a6418 | 586 | phys_addr_t cln; |
0abdd7a8 | 587 | |
c9d120b0 HE |
588 | if (dma_debug_disabled()) |
589 | return; | |
590 | ||
0abdd7a8 DW |
591 | if (!page) |
592 | return; | |
593 | ||
3b7a6418 | 594 | cln = (phys_addr_t) page_to_pfn(page) << CACHELINE_PER_PAGE_SHIFT; |
0abdd7a8 | 595 | spin_lock_irqsave(&radix_lock, flags); |
3b7a6418 DW |
596 | nents = radix_tree_gang_lookup(&dma_active_cacheline, results, cln, |
597 | CACHELINES_PER_PAGE); | |
598 | for (i = 0; i < nents; i++) { | |
599 | phys_addr_t ent_cln = to_cacheline_number(ents[i]); | |
600 | ||
601 | if (ent_cln == cln) { | |
602 | entry = ents[i]; | |
603 | break; | |
604 | } else if (ent_cln >= cln + CACHELINES_PER_PAGE) | |
605 | break; | |
606 | } | |
0abdd7a8 DW |
607 | spin_unlock_irqrestore(&radix_lock, flags); |
608 | ||
609 | if (!entry) | |
610 | return; | |
611 | ||
3b7a6418 | 612 | cln = to_cacheline_number(entry); |
0abdd7a8 | 613 | err_printk(entry->dev, entry, |
3b7a6418 DW |
614 | "DMA-API: cpu touching an active dma mapped cacheline [cln=%pa]\n", |
615 | &cln); | |
0abdd7a8 DW |
616 | } |
617 | ||
30dfa90c JR |
618 | /* |
619 | * Wrapper function for adding an entry to the hash. | |
620 | * This function takes care of locking itself. | |
621 | */ | |
622 | static void add_dma_entry(struct dma_debug_entry *entry) | |
623 | { | |
624 | struct hash_bucket *bucket; | |
625 | unsigned long flags; | |
0abdd7a8 | 626 | int rc; |
30dfa90c JR |
627 | |
628 | bucket = get_hash_bucket(entry, &flags); | |
629 | hash_bucket_add(bucket, entry); | |
630 | put_hash_bucket(bucket, &flags); | |
0abdd7a8 | 631 | |
3b7a6418 | 632 | rc = active_cacheline_insert(entry); |
0abdd7a8 | 633 | if (rc == -ENOMEM) { |
3b7a6418 | 634 | pr_err("DMA-API: cacheline tracking ENOMEM, dma-debug disabled\n"); |
0abdd7a8 DW |
635 | global_disable = true; |
636 | } | |
637 | ||
638 | /* TODO: report -EEXIST errors here as overlapping mappings are | |
639 | * not supported by the DMA API | |
640 | */ | |
30dfa90c JR |
641 | } |
642 | ||
e6a1a89d FT |
643 | static struct dma_debug_entry *__dma_entry_alloc(void) |
644 | { | |
645 | struct dma_debug_entry *entry; | |
646 | ||
647 | entry = list_entry(free_entries.next, struct dma_debug_entry, list); | |
648 | list_del(&entry->list); | |
649 | memset(entry, 0, sizeof(*entry)); | |
650 | ||
651 | num_free_entries -= 1; | |
652 | if (num_free_entries < min_free_entries) | |
653 | min_free_entries = num_free_entries; | |
654 | ||
655 | return entry; | |
656 | } | |
657 | ||
3b1e79ed JR |
658 | /* struct dma_entry allocator |
659 | * | |
660 | * The next two functions implement the allocator for | |
661 | * struct dma_debug_entries. | |
662 | */ | |
663 | static struct dma_debug_entry *dma_entry_alloc(void) | |
664 | { | |
29cdd4e4 | 665 | struct dma_debug_entry *entry; |
3b1e79ed JR |
666 | unsigned long flags; |
667 | ||
668 | spin_lock_irqsave(&free_entries_lock, flags); | |
669 | ||
670 | if (list_empty(&free_entries)) { | |
3b1e79ed | 671 | global_disable = true; |
29cdd4e4 | 672 | spin_unlock_irqrestore(&free_entries_lock, flags); |
3017cd63 | 673 | pr_err("DMA-API: debugging out of memory - disabling\n"); |
29cdd4e4 | 674 | return NULL; |
3b1e79ed JR |
675 | } |
676 | ||
e6a1a89d | 677 | entry = __dma_entry_alloc(); |
3b1e79ed | 678 | |
29cdd4e4 JK |
679 | spin_unlock_irqrestore(&free_entries_lock, flags); |
680 | ||
6c132d1b DW |
681 | #ifdef CONFIG_STACKTRACE |
682 | entry->stacktrace.max_entries = DMA_DEBUG_STACKTRACE_ENTRIES; | |
683 | entry->stacktrace.entries = entry->st_entries; | |
684 | entry->stacktrace.skip = 2; | |
685 | save_stack_trace(&entry->stacktrace); | |
686 | #endif | |
3b1e79ed | 687 | |
3b1e79ed JR |
688 | return entry; |
689 | } | |
690 | ||
691 | static void dma_entry_free(struct dma_debug_entry *entry) | |
692 | { | |
693 | unsigned long flags; | |
694 | ||
3b7a6418 | 695 | active_cacheline_remove(entry); |
0abdd7a8 | 696 | |
3b1e79ed JR |
697 | /* |
698 | * add to beginning of the list - this way the entries are | |
699 | * more likely cache hot when they are reallocated. | |
700 | */ | |
701 | spin_lock_irqsave(&free_entries_lock, flags); | |
702 | list_add(&entry->list, &free_entries); | |
703 | num_free_entries += 1; | |
704 | spin_unlock_irqrestore(&free_entries_lock, flags); | |
705 | } | |
706 | ||
e6a1a89d FT |
707 | int dma_debug_resize_entries(u32 num_entries) |
708 | { | |
709 | int i, delta, ret = 0; | |
710 | unsigned long flags; | |
711 | struct dma_debug_entry *entry; | |
712 | LIST_HEAD(tmp); | |
713 | ||
714 | spin_lock_irqsave(&free_entries_lock, flags); | |
715 | ||
716 | if (nr_total_entries < num_entries) { | |
717 | delta = num_entries - nr_total_entries; | |
718 | ||
719 | spin_unlock_irqrestore(&free_entries_lock, flags); | |
720 | ||
721 | for (i = 0; i < delta; i++) { | |
722 | entry = kzalloc(sizeof(*entry), GFP_KERNEL); | |
723 | if (!entry) | |
724 | break; | |
725 | ||
726 | list_add_tail(&entry->list, &tmp); | |
727 | } | |
728 | ||
729 | spin_lock_irqsave(&free_entries_lock, flags); | |
730 | ||
731 | list_splice(&tmp, &free_entries); | |
732 | nr_total_entries += i; | |
733 | num_free_entries += i; | |
734 | } else { | |
735 | delta = nr_total_entries - num_entries; | |
736 | ||
737 | for (i = 0; i < delta && !list_empty(&free_entries); i++) { | |
738 | entry = __dma_entry_alloc(); | |
739 | kfree(entry); | |
740 | } | |
741 | ||
742 | nr_total_entries -= i; | |
743 | } | |
744 | ||
745 | if (nr_total_entries != num_entries) | |
746 | ret = 1; | |
747 | ||
748 | spin_unlock_irqrestore(&free_entries_lock, flags); | |
749 | ||
750 | return ret; | |
751 | } | |
752 | EXPORT_SYMBOL(dma_debug_resize_entries); | |
753 | ||
6bf07871 JR |
754 | /* |
755 | * DMA-API debugging init code | |
756 | * | |
757 | * The init code does two things: | |
758 | * 1. Initialize core data structures | |
759 | * 2. Preallocate a given number of dma_debug_entry structs | |
760 | */ | |
761 | ||
762 | static int prealloc_memory(u32 num_entries) | |
763 | { | |
764 | struct dma_debug_entry *entry, *next_entry; | |
765 | int i; | |
766 | ||
767 | for (i = 0; i < num_entries; ++i) { | |
768 | entry = kzalloc(sizeof(*entry), GFP_KERNEL); | |
769 | if (!entry) | |
770 | goto out_err; | |
771 | ||
772 | list_add_tail(&entry->list, &free_entries); | |
773 | } | |
774 | ||
775 | num_free_entries = num_entries; | |
776 | min_free_entries = num_entries; | |
777 | ||
e7ed70ee | 778 | pr_info("DMA-API: preallocated %d debug entries\n", num_entries); |
6bf07871 JR |
779 | |
780 | return 0; | |
781 | ||
782 | out_err: | |
783 | ||
784 | list_for_each_entry_safe(entry, next_entry, &free_entries, list) { | |
785 | list_del(&entry->list); | |
786 | kfree(entry); | |
787 | } | |
788 | ||
789 | return -ENOMEM; | |
790 | } | |
791 | ||
8a6fc708 JR |
792 | static ssize_t filter_read(struct file *file, char __user *user_buf, |
793 | size_t count, loff_t *ppos) | |
794 | { | |
8a6fc708 | 795 | char buf[NAME_MAX_LEN + 1]; |
c17e2cf7 | 796 | unsigned long flags; |
8a6fc708 JR |
797 | int len; |
798 | ||
799 | if (!current_driver_name[0]) | |
800 | return 0; | |
801 | ||
802 | /* | |
803 | * We can't copy to userspace directly because current_driver_name can | |
804 | * only be read under the driver_name_lock with irqs disabled. So | |
805 | * create a temporary copy first. | |
806 | */ | |
807 | read_lock_irqsave(&driver_name_lock, flags); | |
808 | len = scnprintf(buf, NAME_MAX_LEN + 1, "%s\n", current_driver_name); | |
809 | read_unlock_irqrestore(&driver_name_lock, flags); | |
810 | ||
811 | return simple_read_from_buffer(user_buf, count, ppos, buf, len); | |
812 | } | |
813 | ||
814 | static ssize_t filter_write(struct file *file, const char __user *userbuf, | |
815 | size_t count, loff_t *ppos) | |
816 | { | |
8a6fc708 | 817 | char buf[NAME_MAX_LEN]; |
c17e2cf7 JR |
818 | unsigned long flags; |
819 | size_t len; | |
8a6fc708 JR |
820 | int i; |
821 | ||
822 | /* | |
823 | * We can't copy from userspace directly. Access to | |
824 | * current_driver_name is protected with a write_lock with irqs | |
825 | * disabled. Since copy_from_user can fault and may sleep we | |
826 | * need to copy to temporary buffer first | |
827 | */ | |
e7ed70ee | 828 | len = min(count, (size_t)(NAME_MAX_LEN - 1)); |
8a6fc708 JR |
829 | if (copy_from_user(buf, userbuf, len)) |
830 | return -EFAULT; | |
831 | ||
832 | buf[len] = 0; | |
833 | ||
834 | write_lock_irqsave(&driver_name_lock, flags); | |
835 | ||
31232509 JR |
836 | /* |
837 | * Now handle the string we got from userspace very carefully. | |
8a6fc708 JR |
838 | * The rules are: |
839 | * - only use the first token we got | |
840 | * - token delimiter is everything looking like a space | |
841 | * character (' ', '\n', '\t' ...) | |
842 | * | |
843 | */ | |
844 | if (!isalnum(buf[0])) { | |
845 | /* | |
31232509 | 846 | * If the first character userspace gave us is not |
8a6fc708 JR |
847 | * alphanumerical then assume the filter should be |
848 | * switched off. | |
849 | */ | |
850 | if (current_driver_name[0]) | |
e7ed70ee | 851 | pr_info("DMA-API: switching off dma-debug driver filter\n"); |
8a6fc708 JR |
852 | current_driver_name[0] = 0; |
853 | current_driver = NULL; | |
854 | goto out_unlock; | |
855 | } | |
856 | ||
857 | /* | |
858 | * Now parse out the first token and use it as the name for the | |
859 | * driver to filter for. | |
860 | */ | |
39a37ce1 | 861 | for (i = 0; i < NAME_MAX_LEN - 1; ++i) { |
8a6fc708 JR |
862 | current_driver_name[i] = buf[i]; |
863 | if (isspace(buf[i]) || buf[i] == ' ' || buf[i] == 0) | |
864 | break; | |
865 | } | |
866 | current_driver_name[i] = 0; | |
867 | current_driver = NULL; | |
868 | ||
e7ed70ee JR |
869 | pr_info("DMA-API: enable driver filter for driver [%s]\n", |
870 | current_driver_name); | |
8a6fc708 JR |
871 | |
872 | out_unlock: | |
873 | write_unlock_irqrestore(&driver_name_lock, flags); | |
874 | ||
875 | return count; | |
876 | } | |
877 | ||
aeb583d0 | 878 | static const struct file_operations filter_fops = { |
8a6fc708 JR |
879 | .read = filter_read, |
880 | .write = filter_write, | |
6038f373 | 881 | .llseek = default_llseek, |
8a6fc708 JR |
882 | }; |
883 | ||
788dcfa6 JR |
884 | static int dma_debug_fs_init(void) |
885 | { | |
886 | dma_debug_dent = debugfs_create_dir("dma-api", NULL); | |
887 | if (!dma_debug_dent) { | |
e7ed70ee | 888 | pr_err("DMA-API: can not create debugfs directory\n"); |
788dcfa6 JR |
889 | return -ENOMEM; |
890 | } | |
891 | ||
892 | global_disable_dent = debugfs_create_bool("disabled", 0444, | |
893 | dma_debug_dent, | |
68ee6d22 | 894 | &global_disable); |
788dcfa6 JR |
895 | if (!global_disable_dent) |
896 | goto out_err; | |
897 | ||
898 | error_count_dent = debugfs_create_u32("error_count", 0444, | |
899 | dma_debug_dent, &error_count); | |
900 | if (!error_count_dent) | |
901 | goto out_err; | |
902 | ||
903 | show_all_errors_dent = debugfs_create_u32("all_errors", 0644, | |
904 | dma_debug_dent, | |
905 | &show_all_errors); | |
906 | if (!show_all_errors_dent) | |
907 | goto out_err; | |
908 | ||
909 | show_num_errors_dent = debugfs_create_u32("num_errors", 0644, | |
910 | dma_debug_dent, | |
911 | &show_num_errors); | |
912 | if (!show_num_errors_dent) | |
913 | goto out_err; | |
914 | ||
915 | num_free_entries_dent = debugfs_create_u32("num_free_entries", 0444, | |
916 | dma_debug_dent, | |
917 | &num_free_entries); | |
918 | if (!num_free_entries_dent) | |
919 | goto out_err; | |
920 | ||
921 | min_free_entries_dent = debugfs_create_u32("min_free_entries", 0444, | |
922 | dma_debug_dent, | |
923 | &min_free_entries); | |
924 | if (!min_free_entries_dent) | |
925 | goto out_err; | |
926 | ||
8a6fc708 JR |
927 | filter_dent = debugfs_create_file("driver_filter", 0644, |
928 | dma_debug_dent, NULL, &filter_fops); | |
929 | if (!filter_dent) | |
930 | goto out_err; | |
931 | ||
788dcfa6 JR |
932 | return 0; |
933 | ||
934 | out_err: | |
935 | debugfs_remove_recursive(dma_debug_dent); | |
936 | ||
937 | return -ENOMEM; | |
938 | } | |
939 | ||
ba4b87ad | 940 | static int device_dma_allocations(struct device *dev, struct dma_debug_entry **out_entry) |
ed888aef JR |
941 | { |
942 | struct dma_debug_entry *entry; | |
943 | unsigned long flags; | |
944 | int count = 0, i; | |
945 | ||
946 | for (i = 0; i < HASH_SIZE; ++i) { | |
6a5cd60b | 947 | spin_lock_irqsave(&dma_entry_hash[i].lock, flags); |
ed888aef | 948 | list_for_each_entry(entry, &dma_entry_hash[i].list, list) { |
ba4b87ad | 949 | if (entry->dev == dev) { |
ed888aef | 950 | count += 1; |
ba4b87ad SG |
951 | *out_entry = entry; |
952 | } | |
ed888aef | 953 | } |
6a5cd60b | 954 | spin_unlock_irqrestore(&dma_entry_hash[i].lock, flags); |
ed888aef JR |
955 | } |
956 | ||
957 | return count; | |
958 | } | |
959 | ||
a8fe9ea2 | 960 | static int dma_debug_device_change(struct notifier_block *nb, unsigned long action, void *data) |
ed888aef JR |
961 | { |
962 | struct device *dev = data; | |
ba4b87ad | 963 | struct dma_debug_entry *uninitialized_var(entry); |
ed888aef JR |
964 | int count; |
965 | ||
01ce18b3 | 966 | if (dma_debug_disabled()) |
a8fe9ea2 | 967 | return 0; |
ed888aef JR |
968 | |
969 | switch (action) { | |
970 | case BUS_NOTIFY_UNBOUND_DRIVER: | |
ba4b87ad | 971 | count = device_dma_allocations(dev, &entry); |
ed888aef JR |
972 | if (count == 0) |
973 | break; | |
ba4b87ad | 974 | err_printk(dev, entry, "DMA-API: device driver has pending " |
ed888aef | 975 | "DMA allocations while released from device " |
ba4b87ad SG |
976 | "[count=%d]\n" |
977 | "One of leaked entries details: " | |
978 | "[device address=0x%016llx] [size=%llu bytes] " | |
979 | "[mapped with %s] [mapped as %s]\n", | |
980 | count, entry->dev_addr, entry->size, | |
981 | dir2name[entry->direction], type2name[entry->type]); | |
ed888aef JR |
982 | break; |
983 | default: | |
984 | break; | |
985 | } | |
986 | ||
987 | return 0; | |
988 | } | |
989 | ||
41531c8f JR |
990 | void dma_debug_add_bus(struct bus_type *bus) |
991 | { | |
ed888aef JR |
992 | struct notifier_block *nb; |
993 | ||
01ce18b3 | 994 | if (dma_debug_disabled()) |
f797d988 SR |
995 | return; |
996 | ||
ed888aef JR |
997 | nb = kzalloc(sizeof(struct notifier_block), GFP_KERNEL); |
998 | if (nb == NULL) { | |
e7ed70ee | 999 | pr_err("dma_debug_add_bus: out of memory\n"); |
ed888aef JR |
1000 | return; |
1001 | } | |
1002 | ||
1003 | nb->notifier_call = dma_debug_device_change; | |
1004 | ||
1005 | bus_register_notifier(bus, nb); | |
41531c8f | 1006 | } |
788dcfa6 | 1007 | |
6bf07871 JR |
1008 | /* |
1009 | * Let the architectures decide how many entries should be preallocated. | |
1010 | */ | |
1011 | void dma_debug_init(u32 num_entries) | |
1012 | { | |
1013 | int i; | |
1014 | ||
2ce8e7ed FF |
1015 | /* Do not use dma_debug_initialized here, since we really want to be |
1016 | * called to set dma_debug_initialized | |
1017 | */ | |
1018 | if (global_disable) | |
6bf07871 JR |
1019 | return; |
1020 | ||
1021 | for (i = 0; i < HASH_SIZE; ++i) { | |
1022 | INIT_LIST_HEAD(&dma_entry_hash[i].list); | |
b0a5b83e | 1023 | spin_lock_init(&dma_entry_hash[i].lock); |
6bf07871 JR |
1024 | } |
1025 | ||
788dcfa6 | 1026 | if (dma_debug_fs_init() != 0) { |
e7ed70ee | 1027 | pr_err("DMA-API: error creating debugfs entries - disabling\n"); |
788dcfa6 JR |
1028 | global_disable = true; |
1029 | ||
1030 | return; | |
1031 | } | |
1032 | ||
59d3daaf JR |
1033 | if (req_entries) |
1034 | num_entries = req_entries; | |
1035 | ||
6bf07871 | 1036 | if (prealloc_memory(num_entries) != 0) { |
e7ed70ee | 1037 | pr_err("DMA-API: debugging out of memory error - disabled\n"); |
6bf07871 JR |
1038 | global_disable = true; |
1039 | ||
1040 | return; | |
1041 | } | |
1042 | ||
e6a1a89d FT |
1043 | nr_total_entries = num_free_entries; |
1044 | ||
2ce8e7ed FF |
1045 | dma_debug_initialized = true; |
1046 | ||
e7ed70ee | 1047 | pr_info("DMA-API: debugging enabled by kernel config\n"); |
6bf07871 JR |
1048 | } |
1049 | ||
59d3daaf JR |
1050 | static __init int dma_debug_cmdline(char *str) |
1051 | { | |
1052 | if (!str) | |
1053 | return -EINVAL; | |
1054 | ||
1055 | if (strncmp(str, "off", 3) == 0) { | |
e7ed70ee | 1056 | pr_info("DMA-API: debugging disabled on kernel command line\n"); |
59d3daaf JR |
1057 | global_disable = true; |
1058 | } | |
1059 | ||
1060 | return 0; | |
1061 | } | |
1062 | ||
1063 | static __init int dma_debug_entries_cmdline(char *str) | |
1064 | { | |
1065 | int res; | |
1066 | ||
1067 | if (!str) | |
1068 | return -EINVAL; | |
1069 | ||
1070 | res = get_option(&str, &req_entries); | |
1071 | ||
1072 | if (!res) | |
1073 | req_entries = 0; | |
1074 | ||
1075 | return 0; | |
1076 | } | |
1077 | ||
1078 | __setup("dma_debug=", dma_debug_cmdline); | |
1079 | __setup("dma_debug_entries=", dma_debug_entries_cmdline); | |
1080 | ||
2d62ece1 JR |
1081 | static void check_unmap(struct dma_debug_entry *ref) |
1082 | { | |
1083 | struct dma_debug_entry *entry; | |
1084 | struct hash_bucket *bucket; | |
1085 | unsigned long flags; | |
1086 | ||
2d62ece1 | 1087 | bucket = get_hash_bucket(ref, &flags); |
c6a21d0b | 1088 | entry = bucket_find_exact(bucket, ref); |
2d62ece1 JR |
1089 | |
1090 | if (!entry) { | |
8d640a51 AD |
1091 | /* must drop lock before calling dma_mapping_error */ |
1092 | put_hash_bucket(bucket, &flags); | |
1093 | ||
bfe0fb0f SK |
1094 | if (dma_mapping_error(ref->dev, ref->dev_addr)) { |
1095 | err_printk(ref->dev, NULL, | |
8d640a51 AD |
1096 | "DMA-API: device driver tries to free an " |
1097 | "invalid DMA memory address\n"); | |
1098 | } else { | |
1099 | err_printk(ref->dev, NULL, | |
1100 | "DMA-API: device driver tries to free DMA " | |
1101 | "memory it has not allocated [device " | |
1102 | "address=0x%016llx] [size=%llu bytes]\n", | |
1103 | ref->dev_addr, ref->size); | |
bfe0fb0f | 1104 | } |
8d640a51 | 1105 | return; |
2d62ece1 JR |
1106 | } |
1107 | ||
1108 | if (ref->size != entry->size) { | |
6c132d1b | 1109 | err_printk(ref->dev, entry, "DMA-API: device driver frees " |
2d62ece1 JR |
1110 | "DMA memory with different size " |
1111 | "[device address=0x%016llx] [map size=%llu bytes] " | |
1112 | "[unmap size=%llu bytes]\n", | |
1113 | ref->dev_addr, entry->size, ref->size); | |
1114 | } | |
1115 | ||
1116 | if (ref->type != entry->type) { | |
6c132d1b | 1117 | err_printk(ref->dev, entry, "DMA-API: device driver frees " |
2d62ece1 JR |
1118 | "DMA memory with wrong function " |
1119 | "[device address=0x%016llx] [size=%llu bytes] " | |
1120 | "[mapped as %s] [unmapped as %s]\n", | |
1121 | ref->dev_addr, ref->size, | |
1122 | type2name[entry->type], type2name[ref->type]); | |
1123 | } else if ((entry->type == dma_debug_coherent) && | |
0abdd7a8 | 1124 | (phys_addr(ref) != phys_addr(entry))) { |
6c132d1b | 1125 | err_printk(ref->dev, entry, "DMA-API: device driver frees " |
2d62ece1 JR |
1126 | "DMA memory with different CPU address " |
1127 | "[device address=0x%016llx] [size=%llu bytes] " | |
59a40e70 JR |
1128 | "[cpu alloc address=0x%016llx] " |
1129 | "[cpu free address=0x%016llx]", | |
2d62ece1 | 1130 | ref->dev_addr, ref->size, |
0abdd7a8 DW |
1131 | phys_addr(entry), |
1132 | phys_addr(ref)); | |
2d62ece1 JR |
1133 | } |
1134 | ||
1135 | if (ref->sg_call_ents && ref->type == dma_debug_sg && | |
1136 | ref->sg_call_ents != entry->sg_call_ents) { | |
6c132d1b | 1137 | err_printk(ref->dev, entry, "DMA-API: device driver frees " |
2d62ece1 JR |
1138 | "DMA sg list with different entry count " |
1139 | "[map count=%d] [unmap count=%d]\n", | |
1140 | entry->sg_call_ents, ref->sg_call_ents); | |
1141 | } | |
1142 | ||
1143 | /* | |
1144 | * This may be no bug in reality - but most implementations of the | |
1145 | * DMA API don't handle this properly, so check for it here | |
1146 | */ | |
1147 | if (ref->direction != entry->direction) { | |
6c132d1b | 1148 | err_printk(ref->dev, entry, "DMA-API: device driver frees " |
2d62ece1 JR |
1149 | "DMA memory with different direction " |
1150 | "[device address=0x%016llx] [size=%llu bytes] " | |
1151 | "[mapped with %s] [unmapped with %s]\n", | |
1152 | ref->dev_addr, ref->size, | |
1153 | dir2name[entry->direction], | |
1154 | dir2name[ref->direction]); | |
1155 | } | |
1156 | ||
a5759b2b MC |
1157 | /* |
1158 | * Drivers should use dma_mapping_error() to check the returned | |
1159 | * addresses of dma_map_single() and dma_map_page(). | |
1160 | * If not, print this warning message. See Documentation/DMA-API.txt. | |
1161 | */ | |
6c9c6d63 SK |
1162 | if (entry->map_err_type == MAP_ERR_NOT_CHECKED) { |
1163 | err_printk(ref->dev, entry, | |
1164 | "DMA-API: device driver failed to check map error" | |
1165 | "[device address=0x%016llx] [size=%llu bytes] " | |
1166 | "[mapped as %s]", | |
1167 | ref->dev_addr, ref->size, | |
1168 | type2name[entry->type]); | |
1169 | } | |
1170 | ||
2d62ece1 JR |
1171 | hash_bucket_del(entry); |
1172 | dma_entry_free(entry); | |
1173 | ||
2d62ece1 JR |
1174 | put_hash_bucket(bucket, &flags); |
1175 | } | |
1176 | ||
b4a0f533 AL |
1177 | static void check_for_stack(struct device *dev, |
1178 | struct page *page, size_t offset) | |
2d62ece1 | 1179 | { |
b4a0f533 AL |
1180 | void *addr; |
1181 | struct vm_struct *stack_vm_area = task_stack_vm_area(current); | |
1182 | ||
1183 | if (!stack_vm_area) { | |
1184 | /* Stack is direct-mapped. */ | |
1185 | if (PageHighMem(page)) | |
1186 | return; | |
1187 | addr = page_address(page) + offset; | |
1188 | if (object_is_on_stack(addr)) | |
1189 | err_printk(dev, NULL, "DMA-API: device driver maps memory from stack [addr=%p]\n", addr); | |
1190 | } else { | |
1191 | /* Stack is vmalloced. */ | |
1192 | int i; | |
1193 | ||
1194 | for (i = 0; i < stack_vm_area->nr_pages; i++) { | |
1195 | if (page != stack_vm_area->pages[i]) | |
1196 | continue; | |
1197 | ||
1198 | addr = (u8 *)current->stack + i * PAGE_SIZE + offset; | |
1199 | err_printk(dev, NULL, "DMA-API: device driver maps memory from stack [probable addr=%p]\n", addr); | |
1200 | break; | |
1201 | } | |
1202 | } | |
2d62ece1 JR |
1203 | } |
1204 | ||
f39d1b97 | 1205 | static inline bool overlap(void *addr, unsigned long len, void *start, void *end) |
2e34bde1 | 1206 | { |
f39d1b97 IM |
1207 | unsigned long a1 = (unsigned long)addr; |
1208 | unsigned long b1 = a1 + len; | |
1209 | unsigned long a2 = (unsigned long)start; | |
1210 | unsigned long b2 = (unsigned long)end; | |
2e34bde1 | 1211 | |
f39d1b97 | 1212 | return !(b1 <= a2 || a1 >= b2); |
2e34bde1 JR |
1213 | } |
1214 | ||
f39d1b97 | 1215 | static void check_for_illegal_area(struct device *dev, void *addr, unsigned long len) |
2e34bde1 | 1216 | { |
ea535e41 | 1217 | if (overlap(addr, len, _stext, _etext) || |
f39d1b97 IM |
1218 | overlap(addr, len, __start_rodata, __end_rodata)) |
1219 | err_printk(dev, NULL, "DMA-API: device driver maps memory from kernel text or rodata [addr=%p] [len=%lu]\n", addr, len); | |
2e34bde1 JR |
1220 | } |
1221 | ||
aa010efb JR |
1222 | static void check_sync(struct device *dev, |
1223 | struct dma_debug_entry *ref, | |
1224 | bool to_cpu) | |
2d62ece1 | 1225 | { |
2d62ece1 JR |
1226 | struct dma_debug_entry *entry; |
1227 | struct hash_bucket *bucket; | |
1228 | unsigned long flags; | |
1229 | ||
aa010efb | 1230 | bucket = get_hash_bucket(ref, &flags); |
2d62ece1 | 1231 | |
c6a21d0b | 1232 | entry = bucket_find_contain(&bucket, ref, &flags); |
2d62ece1 JR |
1233 | |
1234 | if (!entry) { | |
6c132d1b | 1235 | err_printk(dev, NULL, "DMA-API: device driver tries " |
2d62ece1 JR |
1236 | "to sync DMA memory it has not allocated " |
1237 | "[device address=0x%016llx] [size=%llu bytes]\n", | |
aa010efb | 1238 | (unsigned long long)ref->dev_addr, ref->size); |
2d62ece1 JR |
1239 | goto out; |
1240 | } | |
1241 | ||
aa010efb | 1242 | if (ref->size > entry->size) { |
6c132d1b | 1243 | err_printk(dev, entry, "DMA-API: device driver syncs" |
2d62ece1 JR |
1244 | " DMA memory outside allocated range " |
1245 | "[device address=0x%016llx] " | |
aa010efb JR |
1246 | "[allocation size=%llu bytes] " |
1247 | "[sync offset+size=%llu]\n", | |
1248 | entry->dev_addr, entry->size, | |
1249 | ref->size); | |
2d62ece1 JR |
1250 | } |
1251 | ||
42d53b4f KH |
1252 | if (entry->direction == DMA_BIDIRECTIONAL) |
1253 | goto out; | |
1254 | ||
aa010efb | 1255 | if (ref->direction != entry->direction) { |
6c132d1b | 1256 | err_printk(dev, entry, "DMA-API: device driver syncs " |
2d62ece1 JR |
1257 | "DMA memory with different direction " |
1258 | "[device address=0x%016llx] [size=%llu bytes] " | |
1259 | "[mapped with %s] [synced with %s]\n", | |
aa010efb | 1260 | (unsigned long long)ref->dev_addr, entry->size, |
2d62ece1 | 1261 | dir2name[entry->direction], |
aa010efb | 1262 | dir2name[ref->direction]); |
2d62ece1 JR |
1263 | } |
1264 | ||
2d62ece1 | 1265 | if (to_cpu && !(entry->direction == DMA_FROM_DEVICE) && |
aa010efb | 1266 | !(ref->direction == DMA_TO_DEVICE)) |
6c132d1b | 1267 | err_printk(dev, entry, "DMA-API: device driver syncs " |
2d62ece1 JR |
1268 | "device read-only DMA memory for cpu " |
1269 | "[device address=0x%016llx] [size=%llu bytes] " | |
1270 | "[mapped with %s] [synced with %s]\n", | |
aa010efb | 1271 | (unsigned long long)ref->dev_addr, entry->size, |
2d62ece1 | 1272 | dir2name[entry->direction], |
aa010efb | 1273 | dir2name[ref->direction]); |
2d62ece1 JR |
1274 | |
1275 | if (!to_cpu && !(entry->direction == DMA_TO_DEVICE) && | |
aa010efb | 1276 | !(ref->direction == DMA_FROM_DEVICE)) |
6c132d1b | 1277 | err_printk(dev, entry, "DMA-API: device driver syncs " |
2d62ece1 JR |
1278 | "device write-only DMA memory to device " |
1279 | "[device address=0x%016llx] [size=%llu bytes] " | |
1280 | "[mapped with %s] [synced with %s]\n", | |
aa010efb | 1281 | (unsigned long long)ref->dev_addr, entry->size, |
2d62ece1 | 1282 | dir2name[entry->direction], |
aa010efb | 1283 | dir2name[ref->direction]); |
2d62ece1 | 1284 | |
7f830642 RM |
1285 | if (ref->sg_call_ents && ref->type == dma_debug_sg && |
1286 | ref->sg_call_ents != entry->sg_call_ents) { | |
1287 | err_printk(ref->dev, entry, "DMA-API: device driver syncs " | |
1288 | "DMA sg list with different entry count " | |
1289 | "[map count=%d] [sync count=%d]\n", | |
1290 | entry->sg_call_ents, ref->sg_call_ents); | |
1291 | } | |
1292 | ||
2d62ece1 JR |
1293 | out: |
1294 | put_hash_bucket(bucket, &flags); | |
2d62ece1 JR |
1295 | } |
1296 | ||
f62bc980 JR |
1297 | void debug_dma_map_page(struct device *dev, struct page *page, size_t offset, |
1298 | size_t size, int direction, dma_addr_t dma_addr, | |
1299 | bool map_single) | |
1300 | { | |
1301 | struct dma_debug_entry *entry; | |
1302 | ||
01ce18b3 | 1303 | if (unlikely(dma_debug_disabled())) |
f62bc980 JR |
1304 | return; |
1305 | ||
bfe0fb0f | 1306 | if (dma_mapping_error(dev, dma_addr)) |
f62bc980 JR |
1307 | return; |
1308 | ||
1309 | entry = dma_entry_alloc(); | |
1310 | if (!entry) | |
1311 | return; | |
1312 | ||
1313 | entry->dev = dev; | |
1314 | entry->type = dma_debug_page; | |
0abdd7a8 DW |
1315 | entry->pfn = page_to_pfn(page); |
1316 | entry->offset = offset, | |
f62bc980 JR |
1317 | entry->dev_addr = dma_addr; |
1318 | entry->size = size; | |
1319 | entry->direction = direction; | |
6c9c6d63 | 1320 | entry->map_err_type = MAP_ERR_NOT_CHECKED; |
f62bc980 | 1321 | |
9537a48e | 1322 | if (map_single) |
f62bc980 | 1323 | entry->type = dma_debug_single; |
9537a48e | 1324 | |
b4a0f533 AL |
1325 | check_for_stack(dev, page, offset); |
1326 | ||
9537a48e | 1327 | if (!PageHighMem(page)) { |
f39d1b97 IM |
1328 | void *addr = page_address(page) + offset; |
1329 | ||
2e34bde1 | 1330 | check_for_illegal_area(dev, addr, size); |
f62bc980 JR |
1331 | } |
1332 | ||
1333 | add_dma_entry(entry); | |
1334 | } | |
1335 | EXPORT_SYMBOL(debug_dma_map_page); | |
1336 | ||
6c9c6d63 SK |
1337 | void debug_dma_mapping_error(struct device *dev, dma_addr_t dma_addr) |
1338 | { | |
1339 | struct dma_debug_entry ref; | |
1340 | struct dma_debug_entry *entry; | |
1341 | struct hash_bucket *bucket; | |
1342 | unsigned long flags; | |
1343 | ||
01ce18b3 | 1344 | if (unlikely(dma_debug_disabled())) |
6c9c6d63 SK |
1345 | return; |
1346 | ||
1347 | ref.dev = dev; | |
1348 | ref.dev_addr = dma_addr; | |
1349 | bucket = get_hash_bucket(&ref, &flags); | |
6c9c6d63 | 1350 | |
96e7d7a1 AD |
1351 | list_for_each_entry(entry, &bucket->list, list) { |
1352 | if (!exact_match(&ref, entry)) | |
1353 | continue; | |
1354 | ||
1355 | /* | |
1356 | * The same physical address can be mapped multiple | |
1357 | * times. Without a hardware IOMMU this results in the | |
1358 | * same device addresses being put into the dma-debug | |
1359 | * hash multiple times too. This can result in false | |
1360 | * positives being reported. Therefore we implement a | |
1361 | * best-fit algorithm here which updates the first entry | |
1362 | * from the hash which fits the reference value and is | |
1363 | * not currently listed as being checked. | |
1364 | */ | |
1365 | if (entry->map_err_type == MAP_ERR_NOT_CHECKED) { | |
1366 | entry->map_err_type = MAP_ERR_CHECKED; | |
1367 | break; | |
1368 | } | |
1369 | } | |
6c9c6d63 | 1370 | |
6c9c6d63 SK |
1371 | put_hash_bucket(bucket, &flags); |
1372 | } | |
1373 | EXPORT_SYMBOL(debug_dma_mapping_error); | |
1374 | ||
f62bc980 JR |
1375 | void debug_dma_unmap_page(struct device *dev, dma_addr_t addr, |
1376 | size_t size, int direction, bool map_single) | |
1377 | { | |
1378 | struct dma_debug_entry ref = { | |
1379 | .type = dma_debug_page, | |
1380 | .dev = dev, | |
1381 | .dev_addr = addr, | |
1382 | .size = size, | |
1383 | .direction = direction, | |
1384 | }; | |
1385 | ||
01ce18b3 | 1386 | if (unlikely(dma_debug_disabled())) |
f62bc980 JR |
1387 | return; |
1388 | ||
1389 | if (map_single) | |
1390 | ref.type = dma_debug_single; | |
1391 | ||
1392 | check_unmap(&ref); | |
1393 | } | |
1394 | EXPORT_SYMBOL(debug_dma_unmap_page); | |
1395 | ||
972aa45c JR |
1396 | void debug_dma_map_sg(struct device *dev, struct scatterlist *sg, |
1397 | int nents, int mapped_ents, int direction) | |
1398 | { | |
1399 | struct dma_debug_entry *entry; | |
1400 | struct scatterlist *s; | |
1401 | int i; | |
1402 | ||
01ce18b3 | 1403 | if (unlikely(dma_debug_disabled())) |
972aa45c JR |
1404 | return; |
1405 | ||
1406 | for_each_sg(sg, s, mapped_ents, i) { | |
1407 | entry = dma_entry_alloc(); | |
1408 | if (!entry) | |
1409 | return; | |
1410 | ||
1411 | entry->type = dma_debug_sg; | |
1412 | entry->dev = dev; | |
0abdd7a8 DW |
1413 | entry->pfn = page_to_pfn(sg_page(s)); |
1414 | entry->offset = s->offset, | |
884d0597 | 1415 | entry->size = sg_dma_len(s); |
15aedea4 | 1416 | entry->dev_addr = sg_dma_address(s); |
972aa45c JR |
1417 | entry->direction = direction; |
1418 | entry->sg_call_ents = nents; | |
1419 | entry->sg_mapped_ents = mapped_ents; | |
1420 | ||
b4a0f533 AL |
1421 | check_for_stack(dev, sg_page(s), s->offset); |
1422 | ||
9537a48e | 1423 | if (!PageHighMem(sg_page(s))) { |
884d0597 | 1424 | check_for_illegal_area(dev, sg_virt(s), sg_dma_len(s)); |
9537a48e | 1425 | } |
972aa45c JR |
1426 | |
1427 | add_dma_entry(entry); | |
1428 | } | |
1429 | } | |
1430 | EXPORT_SYMBOL(debug_dma_map_sg); | |
1431 | ||
aa010efb JR |
1432 | static int get_nr_mapped_entries(struct device *dev, |
1433 | struct dma_debug_entry *ref) | |
88f3907f | 1434 | { |
aa010efb | 1435 | struct dma_debug_entry *entry; |
88f3907f FT |
1436 | struct hash_bucket *bucket; |
1437 | unsigned long flags; | |
c17e2cf7 | 1438 | int mapped_ents; |
88f3907f | 1439 | |
aa010efb | 1440 | bucket = get_hash_bucket(ref, &flags); |
c6a21d0b | 1441 | entry = bucket_find_exact(bucket, ref); |
c17e2cf7 | 1442 | mapped_ents = 0; |
88f3907f | 1443 | |
88f3907f FT |
1444 | if (entry) |
1445 | mapped_ents = entry->sg_mapped_ents; | |
1446 | put_hash_bucket(bucket, &flags); | |
1447 | ||
1448 | return mapped_ents; | |
1449 | } | |
1450 | ||
972aa45c JR |
1451 | void debug_dma_unmap_sg(struct device *dev, struct scatterlist *sglist, |
1452 | int nelems, int dir) | |
1453 | { | |
972aa45c JR |
1454 | struct scatterlist *s; |
1455 | int mapped_ents = 0, i; | |
972aa45c | 1456 | |
01ce18b3 | 1457 | if (unlikely(dma_debug_disabled())) |
972aa45c JR |
1458 | return; |
1459 | ||
1460 | for_each_sg(sglist, s, nelems, i) { | |
1461 | ||
1462 | struct dma_debug_entry ref = { | |
1463 | .type = dma_debug_sg, | |
1464 | .dev = dev, | |
0abdd7a8 DW |
1465 | .pfn = page_to_pfn(sg_page(s)), |
1466 | .offset = s->offset, | |
15aedea4 | 1467 | .dev_addr = sg_dma_address(s), |
884d0597 | 1468 | .size = sg_dma_len(s), |
972aa45c | 1469 | .direction = dir, |
e5e8c5b9 | 1470 | .sg_call_ents = nelems, |
972aa45c JR |
1471 | }; |
1472 | ||
1473 | if (mapped_ents && i >= mapped_ents) | |
1474 | break; | |
1475 | ||
e5e8c5b9 | 1476 | if (!i) |
aa010efb | 1477 | mapped_ents = get_nr_mapped_entries(dev, &ref); |
972aa45c JR |
1478 | |
1479 | check_unmap(&ref); | |
1480 | } | |
1481 | } | |
1482 | EXPORT_SYMBOL(debug_dma_unmap_sg); | |
1483 | ||
6bfd4498 JR |
1484 | void debug_dma_alloc_coherent(struct device *dev, size_t size, |
1485 | dma_addr_t dma_addr, void *virt) | |
1486 | { | |
1487 | struct dma_debug_entry *entry; | |
1488 | ||
01ce18b3 | 1489 | if (unlikely(dma_debug_disabled())) |
6bfd4498 JR |
1490 | return; |
1491 | ||
1492 | if (unlikely(virt == NULL)) | |
1493 | return; | |
1494 | ||
1495 | entry = dma_entry_alloc(); | |
1496 | if (!entry) | |
1497 | return; | |
1498 | ||
3aaabbf1 MC |
1499 | /* handle vmalloc and linear addresses */ |
1500 | if (!is_vmalloc_addr(virt) && !virt_to_page(virt)) | |
1501 | return; | |
1502 | ||
6bfd4498 JR |
1503 | entry->type = dma_debug_coherent; |
1504 | entry->dev = dev; | |
e57d0552 | 1505 | entry->offset = offset_in_page(virt); |
6bfd4498 JR |
1506 | entry->size = size; |
1507 | entry->dev_addr = dma_addr; | |
1508 | entry->direction = DMA_BIDIRECTIONAL; | |
1509 | ||
3aaabbf1 MC |
1510 | if (is_vmalloc_addr(virt)) |
1511 | entry->pfn = vmalloc_to_pfn(virt); | |
1512 | else | |
1513 | entry->pfn = page_to_pfn(virt_to_page(virt)); | |
1514 | ||
6bfd4498 JR |
1515 | add_dma_entry(entry); |
1516 | } | |
1517 | EXPORT_SYMBOL(debug_dma_alloc_coherent); | |
1518 | ||
1519 | void debug_dma_free_coherent(struct device *dev, size_t size, | |
1520 | void *virt, dma_addr_t addr) | |
1521 | { | |
1522 | struct dma_debug_entry ref = { | |
1523 | .type = dma_debug_coherent, | |
1524 | .dev = dev, | |
e57d0552 | 1525 | .offset = offset_in_page(virt), |
6bfd4498 JR |
1526 | .dev_addr = addr, |
1527 | .size = size, | |
1528 | .direction = DMA_BIDIRECTIONAL, | |
1529 | }; | |
1530 | ||
3aaabbf1 MC |
1531 | /* handle vmalloc and linear addresses */ |
1532 | if (!is_vmalloc_addr(virt) && !virt_to_page(virt)) | |
1533 | return; | |
1534 | ||
1535 | if (is_vmalloc_addr(virt)) | |
1536 | ref.pfn = vmalloc_to_pfn(virt); | |
1537 | else | |
1538 | ref.pfn = page_to_pfn(virt_to_page(virt)); | |
1539 | ||
01ce18b3 | 1540 | if (unlikely(dma_debug_disabled())) |
6bfd4498 JR |
1541 | return; |
1542 | ||
1543 | check_unmap(&ref); | |
1544 | } | |
1545 | EXPORT_SYMBOL(debug_dma_free_coherent); | |
1546 | ||
0e74b34d NS |
1547 | void debug_dma_map_resource(struct device *dev, phys_addr_t addr, size_t size, |
1548 | int direction, dma_addr_t dma_addr) | |
1549 | { | |
1550 | struct dma_debug_entry *entry; | |
1551 | ||
1552 | if (unlikely(dma_debug_disabled())) | |
1553 | return; | |
1554 | ||
1555 | entry = dma_entry_alloc(); | |
1556 | if (!entry) | |
1557 | return; | |
1558 | ||
1559 | entry->type = dma_debug_resource; | |
1560 | entry->dev = dev; | |
2e0cc304 | 1561 | entry->pfn = PHYS_PFN(addr); |
0e74b34d NS |
1562 | entry->offset = offset_in_page(addr); |
1563 | entry->size = size; | |
1564 | entry->dev_addr = dma_addr; | |
1565 | entry->direction = direction; | |
1566 | entry->map_err_type = MAP_ERR_NOT_CHECKED; | |
1567 | ||
1568 | add_dma_entry(entry); | |
1569 | } | |
1570 | EXPORT_SYMBOL(debug_dma_map_resource); | |
1571 | ||
1572 | void debug_dma_unmap_resource(struct device *dev, dma_addr_t dma_addr, | |
1573 | size_t size, int direction) | |
1574 | { | |
1575 | struct dma_debug_entry ref = { | |
1576 | .type = dma_debug_resource, | |
1577 | .dev = dev, | |
1578 | .dev_addr = dma_addr, | |
1579 | .size = size, | |
1580 | .direction = direction, | |
1581 | }; | |
1582 | ||
1583 | if (unlikely(dma_debug_disabled())) | |
1584 | return; | |
1585 | ||
1586 | check_unmap(&ref); | |
1587 | } | |
1588 | EXPORT_SYMBOL(debug_dma_unmap_resource); | |
1589 | ||
b9d2317e JR |
1590 | void debug_dma_sync_single_for_cpu(struct device *dev, dma_addr_t dma_handle, |
1591 | size_t size, int direction) | |
1592 | { | |
aa010efb JR |
1593 | struct dma_debug_entry ref; |
1594 | ||
01ce18b3 | 1595 | if (unlikely(dma_debug_disabled())) |
b9d2317e JR |
1596 | return; |
1597 | ||
aa010efb JR |
1598 | 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, true); | |
b9d2317e JR |
1606 | } |
1607 | EXPORT_SYMBOL(debug_dma_sync_single_for_cpu); | |
1608 | ||
1609 | void debug_dma_sync_single_for_device(struct device *dev, | |
1610 | dma_addr_t dma_handle, size_t size, | |
1611 | int direction) | |
1612 | { | |
aa010efb JR |
1613 | struct dma_debug_entry ref; |
1614 | ||
01ce18b3 | 1615 | if (unlikely(dma_debug_disabled())) |
b9d2317e JR |
1616 | return; |
1617 | ||
aa010efb JR |
1618 | ref.type = dma_debug_single; |
1619 | ref.dev = dev; | |
1620 | ref.dev_addr = dma_handle; | |
1621 | ref.size = size; | |
1622 | ref.direction = direction; | |
1623 | ref.sg_call_ents = 0; | |
1624 | ||
1625 | check_sync(dev, &ref, false); | |
b9d2317e JR |
1626 | } |
1627 | EXPORT_SYMBOL(debug_dma_sync_single_for_device); | |
1628 | ||
948408ba JR |
1629 | void debug_dma_sync_single_range_for_cpu(struct device *dev, |
1630 | dma_addr_t dma_handle, | |
1631 | unsigned long offset, size_t size, | |
1632 | int direction) | |
1633 | { | |
aa010efb JR |
1634 | struct dma_debug_entry ref; |
1635 | ||
01ce18b3 | 1636 | if (unlikely(dma_debug_disabled())) |
948408ba JR |
1637 | return; |
1638 | ||
aa010efb JR |
1639 | ref.type = dma_debug_single; |
1640 | ref.dev = dev; | |
1641 | ref.dev_addr = dma_handle; | |
1642 | ref.size = offset + size; | |
1643 | ref.direction = direction; | |
1644 | ref.sg_call_ents = 0; | |
1645 | ||
1646 | check_sync(dev, &ref, true); | |
948408ba JR |
1647 | } |
1648 | EXPORT_SYMBOL(debug_dma_sync_single_range_for_cpu); | |
1649 | ||
1650 | void debug_dma_sync_single_range_for_device(struct device *dev, | |
1651 | dma_addr_t dma_handle, | |
1652 | unsigned long offset, | |
1653 | size_t size, int direction) | |
1654 | { | |
aa010efb JR |
1655 | struct dma_debug_entry ref; |
1656 | ||
01ce18b3 | 1657 | if (unlikely(dma_debug_disabled())) |
948408ba JR |
1658 | return; |
1659 | ||
aa010efb JR |
1660 | ref.type = dma_debug_single; |
1661 | ref.dev = dev; | |
1662 | ref.dev_addr = dma_handle; | |
1663 | ref.size = offset + size; | |
1664 | ref.direction = direction; | |
1665 | ref.sg_call_ents = 0; | |
1666 | ||
1667 | check_sync(dev, &ref, false); | |
948408ba JR |
1668 | } |
1669 | EXPORT_SYMBOL(debug_dma_sync_single_range_for_device); | |
1670 | ||
a31fba5d JR |
1671 | void debug_dma_sync_sg_for_cpu(struct device *dev, struct scatterlist *sg, |
1672 | int nelems, int direction) | |
1673 | { | |
1674 | struct scatterlist *s; | |
88f3907f | 1675 | int mapped_ents = 0, i; |
a31fba5d | 1676 | |
01ce18b3 | 1677 | if (unlikely(dma_debug_disabled())) |
a31fba5d JR |
1678 | return; |
1679 | ||
1680 | for_each_sg(sg, s, nelems, i) { | |
aa010efb JR |
1681 | |
1682 | struct dma_debug_entry ref = { | |
1683 | .type = dma_debug_sg, | |
1684 | .dev = dev, | |
0abdd7a8 DW |
1685 | .pfn = page_to_pfn(sg_page(s)), |
1686 | .offset = s->offset, | |
aa010efb JR |
1687 | .dev_addr = sg_dma_address(s), |
1688 | .size = sg_dma_len(s), | |
1689 | .direction = direction, | |
1690 | .sg_call_ents = nelems, | |
1691 | }; | |
1692 | ||
88f3907f | 1693 | if (!i) |
aa010efb | 1694 | mapped_ents = get_nr_mapped_entries(dev, &ref); |
88f3907f FT |
1695 | |
1696 | if (i >= mapped_ents) | |
1697 | break; | |
1698 | ||
aa010efb | 1699 | check_sync(dev, &ref, true); |
a31fba5d JR |
1700 | } |
1701 | } | |
1702 | EXPORT_SYMBOL(debug_dma_sync_sg_for_cpu); | |
1703 | ||
1704 | void debug_dma_sync_sg_for_device(struct device *dev, struct scatterlist *sg, | |
1705 | int nelems, int direction) | |
1706 | { | |
1707 | struct scatterlist *s; | |
88f3907f | 1708 | int mapped_ents = 0, i; |
a31fba5d | 1709 | |
01ce18b3 | 1710 | if (unlikely(dma_debug_disabled())) |
a31fba5d JR |
1711 | return; |
1712 | ||
1713 | for_each_sg(sg, s, nelems, i) { | |
aa010efb JR |
1714 | |
1715 | struct dma_debug_entry ref = { | |
1716 | .type = dma_debug_sg, | |
1717 | .dev = dev, | |
0abdd7a8 DW |
1718 | .pfn = page_to_pfn(sg_page(s)), |
1719 | .offset = s->offset, | |
aa010efb JR |
1720 | .dev_addr = sg_dma_address(s), |
1721 | .size = sg_dma_len(s), | |
1722 | .direction = direction, | |
1723 | .sg_call_ents = nelems, | |
1724 | }; | |
88f3907f | 1725 | if (!i) |
aa010efb | 1726 | mapped_ents = get_nr_mapped_entries(dev, &ref); |
88f3907f FT |
1727 | |
1728 | if (i >= mapped_ents) | |
1729 | break; | |
1730 | ||
aa010efb | 1731 | check_sync(dev, &ref, false); |
a31fba5d JR |
1732 | } |
1733 | } | |
1734 | EXPORT_SYMBOL(debug_dma_sync_sg_for_device); | |
1735 | ||
1745de5e JR |
1736 | static int __init dma_debug_driver_setup(char *str) |
1737 | { | |
1738 | int i; | |
1739 | ||
1740 | for (i = 0; i < NAME_MAX_LEN - 1; ++i, ++str) { | |
1741 | current_driver_name[i] = *str; | |
1742 | if (*str == 0) | |
1743 | break; | |
1744 | } | |
1745 | ||
1746 | if (current_driver_name[0]) | |
e7ed70ee JR |
1747 | pr_info("DMA-API: enable driver filter for driver [%s]\n", |
1748 | current_driver_name); | |
1745de5e JR |
1749 | |
1750 | ||
1751 | return 1; | |
1752 | } | |
1753 | __setup("dma_debug_driver=", dma_debug_driver_setup); |