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Commit | Line | Data |
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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 | ||
972aa45c | 20 | #include <linux/scatterlist.h> |
2d62ece1 | 21 | #include <linux/dma-mapping.h> |
6c132d1b | 22 | #include <linux/stacktrace.h> |
f2f45e5f | 23 | #include <linux/dma-debug.h> |
30dfa90c | 24 | #include <linux/spinlock.h> |
788dcfa6 | 25 | #include <linux/debugfs.h> |
8a6fc708 | 26 | #include <linux/uaccess.h> |
2d62ece1 | 27 | #include <linux/device.h> |
f2f45e5f | 28 | #include <linux/types.h> |
2d62ece1 | 29 | #include <linux/sched.h> |
8a6fc708 | 30 | #include <linux/ctype.h> |
f2f45e5f | 31 | #include <linux/list.h> |
6bf07871 | 32 | #include <linux/slab.h> |
f2f45e5f | 33 | |
2e34bde1 JR |
34 | #include <asm/sections.h> |
35 | ||
30dfa90c JR |
36 | #define HASH_SIZE 1024ULL |
37 | #define HASH_FN_SHIFT 13 | |
38 | #define HASH_FN_MASK (HASH_SIZE - 1) | |
39 | ||
f2f45e5f JR |
40 | enum { |
41 | dma_debug_single, | |
42 | dma_debug_page, | |
43 | dma_debug_sg, | |
44 | dma_debug_coherent, | |
45 | }; | |
46 | ||
6c132d1b DW |
47 | #define DMA_DEBUG_STACKTRACE_ENTRIES 5 |
48 | ||
f2f45e5f JR |
49 | struct dma_debug_entry { |
50 | struct list_head list; | |
51 | struct device *dev; | |
52 | int type; | |
53 | phys_addr_t paddr; | |
54 | u64 dev_addr; | |
55 | u64 size; | |
56 | int direction; | |
57 | int sg_call_ents; | |
58 | int sg_mapped_ents; | |
6c132d1b DW |
59 | #ifdef CONFIG_STACKTRACE |
60 | struct stack_trace stacktrace; | |
61 | unsigned long st_entries[DMA_DEBUG_STACKTRACE_ENTRIES]; | |
62 | #endif | |
f2f45e5f JR |
63 | }; |
64 | ||
30dfa90c JR |
65 | struct hash_bucket { |
66 | struct list_head list; | |
67 | spinlock_t lock; | |
2d62ece1 | 68 | } ____cacheline_aligned_in_smp; |
30dfa90c JR |
69 | |
70 | /* Hash list to save the allocated dma addresses */ | |
71 | static struct hash_bucket dma_entry_hash[HASH_SIZE]; | |
3b1e79ed JR |
72 | /* List of pre-allocated dma_debug_entry's */ |
73 | static LIST_HEAD(free_entries); | |
74 | /* Lock for the list above */ | |
75 | static DEFINE_SPINLOCK(free_entries_lock); | |
76 | ||
77 | /* Global disable flag - will be set in case of an error */ | |
78 | static bool global_disable __read_mostly; | |
79 | ||
788dcfa6 JR |
80 | /* Global error count */ |
81 | static u32 error_count; | |
82 | ||
83 | /* Global error show enable*/ | |
84 | static u32 show_all_errors __read_mostly; | |
85 | /* Number of errors to show */ | |
86 | static u32 show_num_errors = 1; | |
87 | ||
3b1e79ed JR |
88 | static u32 num_free_entries; |
89 | static u32 min_free_entries; | |
e6a1a89d | 90 | static u32 nr_total_entries; |
30dfa90c | 91 | |
59d3daaf JR |
92 | /* number of preallocated entries requested by kernel cmdline */ |
93 | static u32 req_entries; | |
94 | ||
788dcfa6 JR |
95 | /* debugfs dentry's for the stuff above */ |
96 | static struct dentry *dma_debug_dent __read_mostly; | |
97 | static struct dentry *global_disable_dent __read_mostly; | |
98 | static struct dentry *error_count_dent __read_mostly; | |
99 | static struct dentry *show_all_errors_dent __read_mostly; | |
100 | static struct dentry *show_num_errors_dent __read_mostly; | |
101 | static struct dentry *num_free_entries_dent __read_mostly; | |
102 | static struct dentry *min_free_entries_dent __read_mostly; | |
8a6fc708 | 103 | static struct dentry *filter_dent __read_mostly; |
788dcfa6 | 104 | |
2e507d84 JR |
105 | /* per-driver filter related state */ |
106 | ||
107 | #define NAME_MAX_LEN 64 | |
108 | ||
109 | static char current_driver_name[NAME_MAX_LEN] __read_mostly; | |
110 | static struct device_driver *current_driver __read_mostly; | |
111 | ||
112 | static DEFINE_RWLOCK(driver_name_lock); | |
788dcfa6 | 113 | |
2d62ece1 JR |
114 | static const char *type2name[4] = { "single", "page", |
115 | "scather-gather", "coherent" }; | |
116 | ||
117 | static const char *dir2name[4] = { "DMA_BIDIRECTIONAL", "DMA_TO_DEVICE", | |
118 | "DMA_FROM_DEVICE", "DMA_NONE" }; | |
119 | ||
ed888aef JR |
120 | /* little merge helper - remove it after the merge window */ |
121 | #ifndef BUS_NOTIFY_UNBOUND_DRIVER | |
122 | #define BUS_NOTIFY_UNBOUND_DRIVER 0x0005 | |
123 | #endif | |
124 | ||
2d62ece1 JR |
125 | /* |
126 | * The access to some variables in this macro is racy. We can't use atomic_t | |
127 | * here because all these variables are exported to debugfs. Some of them even | |
128 | * writeable. This is also the reason why a lock won't help much. But anyway, | |
129 | * the races are no big deal. Here is why: | |
130 | * | |
131 | * error_count: the addition is racy, but the worst thing that can happen is | |
132 | * that we don't count some errors | |
133 | * show_num_errors: the subtraction is racy. Also no big deal because in | |
134 | * worst case this will result in one warning more in the | |
135 | * system log than the user configured. This variable is | |
136 | * writeable via debugfs. | |
137 | */ | |
6c132d1b DW |
138 | static inline void dump_entry_trace(struct dma_debug_entry *entry) |
139 | { | |
140 | #ifdef CONFIG_STACKTRACE | |
141 | if (entry) { | |
142 | printk(KERN_WARNING "Mapped at:\n"); | |
143 | print_stack_trace(&entry->stacktrace, 0); | |
144 | } | |
145 | #endif | |
146 | } | |
147 | ||
2e507d84 JR |
148 | static bool driver_filter(struct device *dev) |
149 | { | |
150 | /* driver filter off */ | |
151 | if (likely(!current_driver_name[0])) | |
152 | return true; | |
153 | ||
154 | /* driver filter on and initialized */ | |
155 | if (current_driver && dev->driver == current_driver) | |
156 | return true; | |
157 | ||
158 | /* driver filter on but not yet initialized */ | |
159 | if (!current_driver && current_driver_name[0]) { | |
160 | struct device_driver *drv = get_driver(dev->driver); | |
161 | unsigned long flags; | |
162 | bool ret = false; | |
163 | ||
164 | if (!drv) | |
165 | return false; | |
166 | ||
167 | /* lock to protect against change of current_driver_name */ | |
168 | read_lock_irqsave(&driver_name_lock, flags); | |
169 | ||
170 | if (drv->name && | |
8a6fc708 JR |
171 | strncmp(current_driver_name, drv->name, |
172 | NAME_MAX_LEN-1) == 0) { | |
2e507d84 JR |
173 | current_driver = drv; |
174 | ret = true; | |
175 | } | |
176 | ||
177 | read_unlock_irqrestore(&driver_name_lock, flags); | |
178 | put_driver(drv); | |
179 | ||
180 | return ret; | |
181 | } | |
182 | ||
183 | return false; | |
184 | } | |
185 | ||
6c132d1b | 186 | #define err_printk(dev, entry, format, arg...) do { \ |
2d62ece1 | 187 | error_count += 1; \ |
2e507d84 JR |
188 | if (driver_filter(dev) && \ |
189 | (show_all_errors || show_num_errors > 0)) { \ | |
2d62ece1 JR |
190 | WARN(1, "%s %s: " format, \ |
191 | dev_driver_string(dev), \ | |
192 | dev_name(dev) , ## arg); \ | |
6c132d1b | 193 | dump_entry_trace(entry); \ |
2d62ece1 JR |
194 | } \ |
195 | if (!show_all_errors && show_num_errors > 0) \ | |
196 | show_num_errors -= 1; \ | |
197 | } while (0); | |
198 | ||
30dfa90c JR |
199 | /* |
200 | * Hash related functions | |
201 | * | |
202 | * Every DMA-API request is saved into a struct dma_debug_entry. To | |
203 | * have quick access to these structs they are stored into a hash. | |
204 | */ | |
205 | static int hash_fn(struct dma_debug_entry *entry) | |
206 | { | |
207 | /* | |
208 | * Hash function is based on the dma address. | |
209 | * We use bits 20-27 here as the index into the hash | |
210 | */ | |
211 | return (entry->dev_addr >> HASH_FN_SHIFT) & HASH_FN_MASK; | |
212 | } | |
213 | ||
214 | /* | |
215 | * Request exclusive access to a hash bucket for a given dma_debug_entry. | |
216 | */ | |
217 | static struct hash_bucket *get_hash_bucket(struct dma_debug_entry *entry, | |
218 | unsigned long *flags) | |
219 | { | |
220 | int idx = hash_fn(entry); | |
221 | unsigned long __flags; | |
222 | ||
223 | spin_lock_irqsave(&dma_entry_hash[idx].lock, __flags); | |
224 | *flags = __flags; | |
225 | return &dma_entry_hash[idx]; | |
226 | } | |
227 | ||
228 | /* | |
229 | * Give up exclusive access to the hash bucket | |
230 | */ | |
231 | static void put_hash_bucket(struct hash_bucket *bucket, | |
232 | unsigned long *flags) | |
233 | { | |
234 | unsigned long __flags = *flags; | |
235 | ||
236 | spin_unlock_irqrestore(&bucket->lock, __flags); | |
237 | } | |
238 | ||
239 | /* | |
240 | * Search a given entry in the hash bucket list | |
241 | */ | |
242 | static struct dma_debug_entry *hash_bucket_find(struct hash_bucket *bucket, | |
243 | struct dma_debug_entry *ref) | |
244 | { | |
7caf6a49 JR |
245 | struct dma_debug_entry *entry, *ret = NULL; |
246 | int matches = 0, match_lvl, last_lvl = 0; | |
30dfa90c JR |
247 | |
248 | list_for_each_entry(entry, &bucket->list, list) { | |
7caf6a49 JR |
249 | if ((entry->dev_addr != ref->dev_addr) || |
250 | (entry->dev != ref->dev)) | |
251 | continue; | |
252 | ||
253 | /* | |
254 | * Some drivers map the same physical address multiple | |
255 | * times. Without a hardware IOMMU this results in the | |
256 | * same device addresses being put into the dma-debug | |
257 | * hash multiple times too. This can result in false | |
258 | * positives being reported. Therfore we implement a | |
259 | * best-fit algorithm here which returns the entry from | |
260 | * the hash which fits best to the reference value | |
261 | * instead of the first-fit. | |
262 | */ | |
263 | matches += 1; | |
264 | match_lvl = 0; | |
265 | entry->size == ref->size ? ++match_lvl : match_lvl; | |
266 | entry->type == ref->type ? ++match_lvl : match_lvl; | |
267 | entry->direction == ref->direction ? ++match_lvl : match_lvl; | |
268 | ||
269 | if (match_lvl == 3) { | |
270 | /* perfect-fit - return the result */ | |
30dfa90c | 271 | return entry; |
7caf6a49 JR |
272 | } else if (match_lvl > last_lvl) { |
273 | /* | |
274 | * We found an entry that fits better then the | |
275 | * previous one | |
276 | */ | |
277 | last_lvl = match_lvl; | |
278 | ret = entry; | |
279 | } | |
30dfa90c JR |
280 | } |
281 | ||
7caf6a49 JR |
282 | /* |
283 | * If we have multiple matches but no perfect-fit, just return | |
284 | * NULL. | |
285 | */ | |
286 | ret = (matches == 1) ? ret : NULL; | |
287 | ||
288 | return ret; | |
30dfa90c JR |
289 | } |
290 | ||
291 | /* | |
292 | * Add an entry to a hash bucket | |
293 | */ | |
294 | static void hash_bucket_add(struct hash_bucket *bucket, | |
295 | struct dma_debug_entry *entry) | |
296 | { | |
297 | list_add_tail(&entry->list, &bucket->list); | |
298 | } | |
299 | ||
300 | /* | |
301 | * Remove entry from a hash bucket list | |
302 | */ | |
303 | static void hash_bucket_del(struct dma_debug_entry *entry) | |
304 | { | |
305 | list_del(&entry->list); | |
306 | } | |
307 | ||
ac26c18b DW |
308 | /* |
309 | * Dump mapping entries for debugging purposes | |
310 | */ | |
311 | void debug_dma_dump_mappings(struct device *dev) | |
312 | { | |
313 | int idx; | |
314 | ||
315 | for (idx = 0; idx < HASH_SIZE; idx++) { | |
316 | struct hash_bucket *bucket = &dma_entry_hash[idx]; | |
317 | struct dma_debug_entry *entry; | |
318 | unsigned long flags; | |
319 | ||
320 | spin_lock_irqsave(&bucket->lock, flags); | |
321 | ||
322 | list_for_each_entry(entry, &bucket->list, list) { | |
323 | if (!dev || dev == entry->dev) { | |
324 | dev_info(entry->dev, | |
325 | "%s idx %d P=%Lx D=%Lx L=%Lx %s\n", | |
326 | type2name[entry->type], idx, | |
327 | (unsigned long long)entry->paddr, | |
328 | entry->dev_addr, entry->size, | |
329 | dir2name[entry->direction]); | |
330 | } | |
331 | } | |
332 | ||
333 | spin_unlock_irqrestore(&bucket->lock, flags); | |
334 | } | |
335 | } | |
336 | EXPORT_SYMBOL(debug_dma_dump_mappings); | |
337 | ||
30dfa90c JR |
338 | /* |
339 | * Wrapper function for adding an entry to the hash. | |
340 | * This function takes care of locking itself. | |
341 | */ | |
342 | static void add_dma_entry(struct dma_debug_entry *entry) | |
343 | { | |
344 | struct hash_bucket *bucket; | |
345 | unsigned long flags; | |
346 | ||
347 | bucket = get_hash_bucket(entry, &flags); | |
348 | hash_bucket_add(bucket, entry); | |
349 | put_hash_bucket(bucket, &flags); | |
350 | } | |
351 | ||
e6a1a89d FT |
352 | static struct dma_debug_entry *__dma_entry_alloc(void) |
353 | { | |
354 | struct dma_debug_entry *entry; | |
355 | ||
356 | entry = list_entry(free_entries.next, struct dma_debug_entry, list); | |
357 | list_del(&entry->list); | |
358 | memset(entry, 0, sizeof(*entry)); | |
359 | ||
360 | num_free_entries -= 1; | |
361 | if (num_free_entries < min_free_entries) | |
362 | min_free_entries = num_free_entries; | |
363 | ||
364 | return entry; | |
365 | } | |
366 | ||
3b1e79ed JR |
367 | /* struct dma_entry allocator |
368 | * | |
369 | * The next two functions implement the allocator for | |
370 | * struct dma_debug_entries. | |
371 | */ | |
372 | static struct dma_debug_entry *dma_entry_alloc(void) | |
373 | { | |
374 | struct dma_debug_entry *entry = NULL; | |
375 | unsigned long flags; | |
376 | ||
377 | spin_lock_irqsave(&free_entries_lock, flags); | |
378 | ||
379 | if (list_empty(&free_entries)) { | |
380 | printk(KERN_ERR "DMA-API: debugging out of memory " | |
381 | "- disabling\n"); | |
382 | global_disable = true; | |
383 | goto out; | |
384 | } | |
385 | ||
e6a1a89d | 386 | entry = __dma_entry_alloc(); |
3b1e79ed | 387 | |
6c132d1b DW |
388 | #ifdef CONFIG_STACKTRACE |
389 | entry->stacktrace.max_entries = DMA_DEBUG_STACKTRACE_ENTRIES; | |
390 | entry->stacktrace.entries = entry->st_entries; | |
391 | entry->stacktrace.skip = 2; | |
392 | save_stack_trace(&entry->stacktrace); | |
393 | #endif | |
3b1e79ed JR |
394 | |
395 | out: | |
396 | spin_unlock_irqrestore(&free_entries_lock, flags); | |
397 | ||
398 | return entry; | |
399 | } | |
400 | ||
401 | static void dma_entry_free(struct dma_debug_entry *entry) | |
402 | { | |
403 | unsigned long flags; | |
404 | ||
405 | /* | |
406 | * add to beginning of the list - this way the entries are | |
407 | * more likely cache hot when they are reallocated. | |
408 | */ | |
409 | spin_lock_irqsave(&free_entries_lock, flags); | |
410 | list_add(&entry->list, &free_entries); | |
411 | num_free_entries += 1; | |
412 | spin_unlock_irqrestore(&free_entries_lock, flags); | |
413 | } | |
414 | ||
e6a1a89d FT |
415 | int dma_debug_resize_entries(u32 num_entries) |
416 | { | |
417 | int i, delta, ret = 0; | |
418 | unsigned long flags; | |
419 | struct dma_debug_entry *entry; | |
420 | LIST_HEAD(tmp); | |
421 | ||
422 | spin_lock_irqsave(&free_entries_lock, flags); | |
423 | ||
424 | if (nr_total_entries < num_entries) { | |
425 | delta = num_entries - nr_total_entries; | |
426 | ||
427 | spin_unlock_irqrestore(&free_entries_lock, flags); | |
428 | ||
429 | for (i = 0; i < delta; i++) { | |
430 | entry = kzalloc(sizeof(*entry), GFP_KERNEL); | |
431 | if (!entry) | |
432 | break; | |
433 | ||
434 | list_add_tail(&entry->list, &tmp); | |
435 | } | |
436 | ||
437 | spin_lock_irqsave(&free_entries_lock, flags); | |
438 | ||
439 | list_splice(&tmp, &free_entries); | |
440 | nr_total_entries += i; | |
441 | num_free_entries += i; | |
442 | } else { | |
443 | delta = nr_total_entries - num_entries; | |
444 | ||
445 | for (i = 0; i < delta && !list_empty(&free_entries); i++) { | |
446 | entry = __dma_entry_alloc(); | |
447 | kfree(entry); | |
448 | } | |
449 | ||
450 | nr_total_entries -= i; | |
451 | } | |
452 | ||
453 | if (nr_total_entries != num_entries) | |
454 | ret = 1; | |
455 | ||
456 | spin_unlock_irqrestore(&free_entries_lock, flags); | |
457 | ||
458 | return ret; | |
459 | } | |
460 | EXPORT_SYMBOL(dma_debug_resize_entries); | |
461 | ||
6bf07871 JR |
462 | /* |
463 | * DMA-API debugging init code | |
464 | * | |
465 | * The init code does two things: | |
466 | * 1. Initialize core data structures | |
467 | * 2. Preallocate a given number of dma_debug_entry structs | |
468 | */ | |
469 | ||
470 | static int prealloc_memory(u32 num_entries) | |
471 | { | |
472 | struct dma_debug_entry *entry, *next_entry; | |
473 | int i; | |
474 | ||
475 | for (i = 0; i < num_entries; ++i) { | |
476 | entry = kzalloc(sizeof(*entry), GFP_KERNEL); | |
477 | if (!entry) | |
478 | goto out_err; | |
479 | ||
480 | list_add_tail(&entry->list, &free_entries); | |
481 | } | |
482 | ||
483 | num_free_entries = num_entries; | |
484 | min_free_entries = num_entries; | |
485 | ||
486 | printk(KERN_INFO "DMA-API: preallocated %d debug entries\n", | |
487 | num_entries); | |
488 | ||
489 | return 0; | |
490 | ||
491 | out_err: | |
492 | ||
493 | list_for_each_entry_safe(entry, next_entry, &free_entries, list) { | |
494 | list_del(&entry->list); | |
495 | kfree(entry); | |
496 | } | |
497 | ||
498 | return -ENOMEM; | |
499 | } | |
500 | ||
8a6fc708 JR |
501 | static ssize_t filter_read(struct file *file, char __user *user_buf, |
502 | size_t count, loff_t *ppos) | |
503 | { | |
504 | unsigned long flags; | |
505 | char buf[NAME_MAX_LEN + 1]; | |
506 | int len; | |
507 | ||
508 | if (!current_driver_name[0]) | |
509 | return 0; | |
510 | ||
511 | /* | |
512 | * We can't copy to userspace directly because current_driver_name can | |
513 | * only be read under the driver_name_lock with irqs disabled. So | |
514 | * create a temporary copy first. | |
515 | */ | |
516 | read_lock_irqsave(&driver_name_lock, flags); | |
517 | len = scnprintf(buf, NAME_MAX_LEN + 1, "%s\n", current_driver_name); | |
518 | read_unlock_irqrestore(&driver_name_lock, flags); | |
519 | ||
520 | return simple_read_from_buffer(user_buf, count, ppos, buf, len); | |
521 | } | |
522 | ||
523 | static ssize_t filter_write(struct file *file, const char __user *userbuf, | |
524 | size_t count, loff_t *ppos) | |
525 | { | |
526 | unsigned long flags; | |
527 | char buf[NAME_MAX_LEN]; | |
528 | size_t len = NAME_MAX_LEN - 1; | |
529 | int i; | |
530 | ||
531 | /* | |
532 | * We can't copy from userspace directly. Access to | |
533 | * current_driver_name is protected with a write_lock with irqs | |
534 | * disabled. Since copy_from_user can fault and may sleep we | |
535 | * need to copy to temporary buffer first | |
536 | */ | |
537 | len = min(count, len); | |
538 | if (copy_from_user(buf, userbuf, len)) | |
539 | return -EFAULT; | |
540 | ||
541 | buf[len] = 0; | |
542 | ||
543 | write_lock_irqsave(&driver_name_lock, flags); | |
544 | ||
545 | /* Now handle the string we got from userspace very carefully. | |
546 | * The rules are: | |
547 | * - only use the first token we got | |
548 | * - token delimiter is everything looking like a space | |
549 | * character (' ', '\n', '\t' ...) | |
550 | * | |
551 | */ | |
552 | if (!isalnum(buf[0])) { | |
553 | /* | |
554 | If the first character userspace gave us is not | |
555 | * alphanumerical then assume the filter should be | |
556 | * switched off. | |
557 | */ | |
558 | if (current_driver_name[0]) | |
559 | printk(KERN_INFO "DMA-API: switching off dma-debug " | |
560 | "driver filter\n"); | |
561 | current_driver_name[0] = 0; | |
562 | current_driver = NULL; | |
563 | goto out_unlock; | |
564 | } | |
565 | ||
566 | /* | |
567 | * Now parse out the first token and use it as the name for the | |
568 | * driver to filter for. | |
569 | */ | |
570 | for (i = 0; i < NAME_MAX_LEN; ++i) { | |
571 | current_driver_name[i] = buf[i]; | |
572 | if (isspace(buf[i]) || buf[i] == ' ' || buf[i] == 0) | |
573 | break; | |
574 | } | |
575 | current_driver_name[i] = 0; | |
576 | current_driver = NULL; | |
577 | ||
578 | printk(KERN_INFO "DMA-API: enable driver filter for driver [%s]\n", | |
579 | current_driver_name); | |
580 | ||
581 | out_unlock: | |
582 | write_unlock_irqrestore(&driver_name_lock, flags); | |
583 | ||
584 | return count; | |
585 | } | |
586 | ||
587 | const struct file_operations filter_fops = { | |
588 | .read = filter_read, | |
589 | .write = filter_write, | |
590 | }; | |
591 | ||
788dcfa6 JR |
592 | static int dma_debug_fs_init(void) |
593 | { | |
594 | dma_debug_dent = debugfs_create_dir("dma-api", NULL); | |
595 | if (!dma_debug_dent) { | |
596 | printk(KERN_ERR "DMA-API: can not create debugfs directory\n"); | |
597 | return -ENOMEM; | |
598 | } | |
599 | ||
600 | global_disable_dent = debugfs_create_bool("disabled", 0444, | |
601 | dma_debug_dent, | |
602 | (u32 *)&global_disable); | |
603 | if (!global_disable_dent) | |
604 | goto out_err; | |
605 | ||
606 | error_count_dent = debugfs_create_u32("error_count", 0444, | |
607 | dma_debug_dent, &error_count); | |
608 | if (!error_count_dent) | |
609 | goto out_err; | |
610 | ||
611 | show_all_errors_dent = debugfs_create_u32("all_errors", 0644, | |
612 | dma_debug_dent, | |
613 | &show_all_errors); | |
614 | if (!show_all_errors_dent) | |
615 | goto out_err; | |
616 | ||
617 | show_num_errors_dent = debugfs_create_u32("num_errors", 0644, | |
618 | dma_debug_dent, | |
619 | &show_num_errors); | |
620 | if (!show_num_errors_dent) | |
621 | goto out_err; | |
622 | ||
623 | num_free_entries_dent = debugfs_create_u32("num_free_entries", 0444, | |
624 | dma_debug_dent, | |
625 | &num_free_entries); | |
626 | if (!num_free_entries_dent) | |
627 | goto out_err; | |
628 | ||
629 | min_free_entries_dent = debugfs_create_u32("min_free_entries", 0444, | |
630 | dma_debug_dent, | |
631 | &min_free_entries); | |
632 | if (!min_free_entries_dent) | |
633 | goto out_err; | |
634 | ||
8a6fc708 JR |
635 | filter_dent = debugfs_create_file("driver_filter", 0644, |
636 | dma_debug_dent, NULL, &filter_fops); | |
637 | if (!filter_dent) | |
638 | goto out_err; | |
639 | ||
788dcfa6 JR |
640 | return 0; |
641 | ||
642 | out_err: | |
643 | debugfs_remove_recursive(dma_debug_dent); | |
644 | ||
645 | return -ENOMEM; | |
646 | } | |
647 | ||
ed888aef JR |
648 | static int device_dma_allocations(struct device *dev) |
649 | { | |
650 | struct dma_debug_entry *entry; | |
651 | unsigned long flags; | |
652 | int count = 0, i; | |
653 | ||
654 | for (i = 0; i < HASH_SIZE; ++i) { | |
655 | spin_lock_irqsave(&dma_entry_hash[i].lock, flags); | |
656 | list_for_each_entry(entry, &dma_entry_hash[i].list, list) { | |
657 | if (entry->dev == dev) | |
658 | count += 1; | |
659 | } | |
660 | spin_unlock_irqrestore(&dma_entry_hash[i].lock, flags); | |
661 | } | |
662 | ||
663 | return count; | |
664 | } | |
665 | ||
666 | static int dma_debug_device_change(struct notifier_block *nb, | |
667 | unsigned long action, void *data) | |
668 | { | |
669 | struct device *dev = data; | |
670 | int count; | |
671 | ||
672 | ||
673 | switch (action) { | |
674 | case BUS_NOTIFY_UNBOUND_DRIVER: | |
675 | count = device_dma_allocations(dev); | |
676 | if (count == 0) | |
677 | break; | |
678 | err_printk(dev, NULL, "DMA-API: device driver has pending " | |
679 | "DMA allocations while released from device " | |
680 | "[count=%d]\n", count); | |
681 | break; | |
682 | default: | |
683 | break; | |
684 | } | |
685 | ||
686 | return 0; | |
687 | } | |
688 | ||
41531c8f JR |
689 | void dma_debug_add_bus(struct bus_type *bus) |
690 | { | |
ed888aef JR |
691 | struct notifier_block *nb; |
692 | ||
693 | nb = kzalloc(sizeof(struct notifier_block), GFP_KERNEL); | |
694 | if (nb == NULL) { | |
695 | printk(KERN_ERR "dma_debug_add_bus: out of memory\n"); | |
696 | return; | |
697 | } | |
698 | ||
699 | nb->notifier_call = dma_debug_device_change; | |
700 | ||
701 | bus_register_notifier(bus, nb); | |
41531c8f | 702 | } |
788dcfa6 | 703 | |
6bf07871 JR |
704 | /* |
705 | * Let the architectures decide how many entries should be preallocated. | |
706 | */ | |
707 | void dma_debug_init(u32 num_entries) | |
708 | { | |
709 | int i; | |
710 | ||
711 | if (global_disable) | |
712 | return; | |
713 | ||
714 | for (i = 0; i < HASH_SIZE; ++i) { | |
715 | INIT_LIST_HEAD(&dma_entry_hash[i].list); | |
716 | dma_entry_hash[i].lock = SPIN_LOCK_UNLOCKED; | |
717 | } | |
718 | ||
788dcfa6 JR |
719 | if (dma_debug_fs_init() != 0) { |
720 | printk(KERN_ERR "DMA-API: error creating debugfs entries " | |
721 | "- disabling\n"); | |
722 | global_disable = true; | |
723 | ||
724 | return; | |
725 | } | |
726 | ||
59d3daaf JR |
727 | if (req_entries) |
728 | num_entries = req_entries; | |
729 | ||
6bf07871 JR |
730 | if (prealloc_memory(num_entries) != 0) { |
731 | printk(KERN_ERR "DMA-API: debugging out of memory error " | |
732 | "- disabled\n"); | |
733 | global_disable = true; | |
734 | ||
735 | return; | |
736 | } | |
737 | ||
e6a1a89d FT |
738 | nr_total_entries = num_free_entries; |
739 | ||
6bf07871 JR |
740 | printk(KERN_INFO "DMA-API: debugging enabled by kernel config\n"); |
741 | } | |
742 | ||
59d3daaf JR |
743 | static __init int dma_debug_cmdline(char *str) |
744 | { | |
745 | if (!str) | |
746 | return -EINVAL; | |
747 | ||
748 | if (strncmp(str, "off", 3) == 0) { | |
749 | printk(KERN_INFO "DMA-API: debugging disabled on kernel " | |
750 | "command line\n"); | |
751 | global_disable = true; | |
752 | } | |
753 | ||
754 | return 0; | |
755 | } | |
756 | ||
757 | static __init int dma_debug_entries_cmdline(char *str) | |
758 | { | |
759 | int res; | |
760 | ||
761 | if (!str) | |
762 | return -EINVAL; | |
763 | ||
764 | res = get_option(&str, &req_entries); | |
765 | ||
766 | if (!res) | |
767 | req_entries = 0; | |
768 | ||
769 | return 0; | |
770 | } | |
771 | ||
772 | __setup("dma_debug=", dma_debug_cmdline); | |
773 | __setup("dma_debug_entries=", dma_debug_entries_cmdline); | |
774 | ||
2d62ece1 JR |
775 | static void check_unmap(struct dma_debug_entry *ref) |
776 | { | |
777 | struct dma_debug_entry *entry; | |
778 | struct hash_bucket *bucket; | |
779 | unsigned long flags; | |
780 | ||
35d40952 FT |
781 | if (dma_mapping_error(ref->dev, ref->dev_addr)) { |
782 | err_printk(ref->dev, NULL, "DMA-API: device driver tries " | |
783 | "to free an invalid DMA memory address\n"); | |
2d62ece1 | 784 | return; |
35d40952 | 785 | } |
2d62ece1 JR |
786 | |
787 | bucket = get_hash_bucket(ref, &flags); | |
788 | entry = hash_bucket_find(bucket, ref); | |
789 | ||
790 | if (!entry) { | |
6c132d1b | 791 | err_printk(ref->dev, NULL, "DMA-API: device driver tries " |
2d62ece1 JR |
792 | "to free DMA memory it has not allocated " |
793 | "[device address=0x%016llx] [size=%llu bytes]\n", | |
794 | ref->dev_addr, ref->size); | |
795 | goto out; | |
796 | } | |
797 | ||
798 | if (ref->size != entry->size) { | |
6c132d1b | 799 | err_printk(ref->dev, entry, "DMA-API: device driver frees " |
2d62ece1 JR |
800 | "DMA memory with different size " |
801 | "[device address=0x%016llx] [map size=%llu bytes] " | |
802 | "[unmap size=%llu bytes]\n", | |
803 | ref->dev_addr, entry->size, ref->size); | |
804 | } | |
805 | ||
806 | if (ref->type != entry->type) { | |
6c132d1b | 807 | err_printk(ref->dev, entry, "DMA-API: device driver frees " |
2d62ece1 JR |
808 | "DMA memory with wrong function " |
809 | "[device address=0x%016llx] [size=%llu bytes] " | |
810 | "[mapped as %s] [unmapped as %s]\n", | |
811 | ref->dev_addr, ref->size, | |
812 | type2name[entry->type], type2name[ref->type]); | |
813 | } else if ((entry->type == dma_debug_coherent) && | |
814 | (ref->paddr != entry->paddr)) { | |
6c132d1b | 815 | err_printk(ref->dev, entry, "DMA-API: device driver frees " |
2d62ece1 JR |
816 | "DMA memory with different CPU address " |
817 | "[device address=0x%016llx] [size=%llu bytes] " | |
818 | "[cpu alloc address=%p] [cpu free address=%p]", | |
819 | ref->dev_addr, ref->size, | |
820 | (void *)entry->paddr, (void *)ref->paddr); | |
821 | } | |
822 | ||
823 | if (ref->sg_call_ents && ref->type == dma_debug_sg && | |
824 | ref->sg_call_ents != entry->sg_call_ents) { | |
6c132d1b | 825 | err_printk(ref->dev, entry, "DMA-API: device driver frees " |
2d62ece1 JR |
826 | "DMA sg list with different entry count " |
827 | "[map count=%d] [unmap count=%d]\n", | |
828 | entry->sg_call_ents, ref->sg_call_ents); | |
829 | } | |
830 | ||
831 | /* | |
832 | * This may be no bug in reality - but most implementations of the | |
833 | * DMA API don't handle this properly, so check for it here | |
834 | */ | |
835 | if (ref->direction != entry->direction) { | |
6c132d1b | 836 | err_printk(ref->dev, entry, "DMA-API: device driver frees " |
2d62ece1 JR |
837 | "DMA memory with different direction " |
838 | "[device address=0x%016llx] [size=%llu bytes] " | |
839 | "[mapped with %s] [unmapped with %s]\n", | |
840 | ref->dev_addr, ref->size, | |
841 | dir2name[entry->direction], | |
842 | dir2name[ref->direction]); | |
843 | } | |
844 | ||
845 | hash_bucket_del(entry); | |
846 | dma_entry_free(entry); | |
847 | ||
848 | out: | |
849 | put_hash_bucket(bucket, &flags); | |
850 | } | |
851 | ||
852 | static void check_for_stack(struct device *dev, void *addr) | |
853 | { | |
854 | if (object_is_on_stack(addr)) | |
6c132d1b DW |
855 | err_printk(dev, NULL, "DMA-API: device driver maps memory from" |
856 | "stack [addr=%p]\n", addr); | |
2d62ece1 JR |
857 | } |
858 | ||
2e34bde1 JR |
859 | static inline bool overlap(void *addr, u64 size, void *start, void *end) |
860 | { | |
861 | void *addr2 = (char *)addr + size; | |
862 | ||
863 | return ((addr >= start && addr < end) || | |
864 | (addr2 >= start && addr2 < end) || | |
865 | ((addr < start) && (addr2 >= end))); | |
866 | } | |
867 | ||
868 | static void check_for_illegal_area(struct device *dev, void *addr, u64 size) | |
869 | { | |
870 | if (overlap(addr, size, _text, _etext) || | |
871 | overlap(addr, size, __start_rodata, __end_rodata)) | |
872 | err_printk(dev, NULL, "DMA-API: device driver maps " | |
873 | "memory from kernel text or rodata " | |
874 | "[addr=%p] [size=%llu]\n", addr, size); | |
875 | } | |
876 | ||
2d62ece1 JR |
877 | static void check_sync(struct device *dev, dma_addr_t addr, |
878 | u64 size, u64 offset, int direction, bool to_cpu) | |
879 | { | |
880 | struct dma_debug_entry ref = { | |
881 | .dev = dev, | |
882 | .dev_addr = addr, | |
883 | .size = size, | |
884 | .direction = direction, | |
885 | }; | |
886 | struct dma_debug_entry *entry; | |
887 | struct hash_bucket *bucket; | |
888 | unsigned long flags; | |
889 | ||
890 | bucket = get_hash_bucket(&ref, &flags); | |
891 | ||
892 | entry = hash_bucket_find(bucket, &ref); | |
893 | ||
894 | if (!entry) { | |
6c132d1b | 895 | err_printk(dev, NULL, "DMA-API: device driver tries " |
2d62ece1 JR |
896 | "to sync DMA memory it has not allocated " |
897 | "[device address=0x%016llx] [size=%llu bytes]\n", | |
93c36ed8 | 898 | (unsigned long long)addr, size); |
2d62ece1 JR |
899 | goto out; |
900 | } | |
901 | ||
902 | if ((offset + size) > entry->size) { | |
6c132d1b | 903 | err_printk(dev, entry, "DMA-API: device driver syncs" |
2d62ece1 JR |
904 | " DMA memory outside allocated range " |
905 | "[device address=0x%016llx] " | |
906 | "[allocation size=%llu bytes] [sync offset=%llu] " | |
907 | "[sync size=%llu]\n", entry->dev_addr, entry->size, | |
908 | offset, size); | |
909 | } | |
910 | ||
911 | if (direction != entry->direction) { | |
6c132d1b | 912 | err_printk(dev, entry, "DMA-API: device driver syncs " |
2d62ece1 JR |
913 | "DMA memory with different direction " |
914 | "[device address=0x%016llx] [size=%llu bytes] " | |
915 | "[mapped with %s] [synced with %s]\n", | |
93c36ed8 | 916 | (unsigned long long)addr, entry->size, |
2d62ece1 JR |
917 | dir2name[entry->direction], |
918 | dir2name[direction]); | |
919 | } | |
920 | ||
921 | if (entry->direction == DMA_BIDIRECTIONAL) | |
922 | goto out; | |
923 | ||
924 | if (to_cpu && !(entry->direction == DMA_FROM_DEVICE) && | |
925 | !(direction == DMA_TO_DEVICE)) | |
6c132d1b | 926 | err_printk(dev, entry, "DMA-API: device driver syncs " |
2d62ece1 JR |
927 | "device read-only DMA memory for cpu " |
928 | "[device address=0x%016llx] [size=%llu bytes] " | |
929 | "[mapped with %s] [synced with %s]\n", | |
93c36ed8 | 930 | (unsigned long long)addr, entry->size, |
2d62ece1 JR |
931 | dir2name[entry->direction], |
932 | dir2name[direction]); | |
933 | ||
934 | if (!to_cpu && !(entry->direction == DMA_TO_DEVICE) && | |
935 | !(direction == DMA_FROM_DEVICE)) | |
6c132d1b | 936 | err_printk(dev, entry, "DMA-API: device driver syncs " |
2d62ece1 JR |
937 | "device write-only DMA memory to device " |
938 | "[device address=0x%016llx] [size=%llu bytes] " | |
939 | "[mapped with %s] [synced with %s]\n", | |
93c36ed8 | 940 | (unsigned long long)addr, entry->size, |
2d62ece1 JR |
941 | dir2name[entry->direction], |
942 | dir2name[direction]); | |
943 | ||
944 | out: | |
945 | put_hash_bucket(bucket, &flags); | |
946 | ||
947 | } | |
948 | ||
f62bc980 JR |
949 | void debug_dma_map_page(struct device *dev, struct page *page, size_t offset, |
950 | size_t size, int direction, dma_addr_t dma_addr, | |
951 | bool map_single) | |
952 | { | |
953 | struct dma_debug_entry *entry; | |
954 | ||
955 | if (unlikely(global_disable)) | |
956 | return; | |
957 | ||
958 | if (unlikely(dma_mapping_error(dev, dma_addr))) | |
959 | return; | |
960 | ||
961 | entry = dma_entry_alloc(); | |
962 | if (!entry) | |
963 | return; | |
964 | ||
965 | entry->dev = dev; | |
966 | entry->type = dma_debug_page; | |
967 | entry->paddr = page_to_phys(page) + offset; | |
968 | entry->dev_addr = dma_addr; | |
969 | entry->size = size; | |
970 | entry->direction = direction; | |
971 | ||
9537a48e | 972 | if (map_single) |
f62bc980 | 973 | entry->type = dma_debug_single; |
9537a48e JR |
974 | |
975 | if (!PageHighMem(page)) { | |
976 | void *addr = ((char *)page_address(page)) + offset; | |
2e34bde1 JR |
977 | check_for_stack(dev, addr); |
978 | check_for_illegal_area(dev, addr, size); | |
f62bc980 JR |
979 | } |
980 | ||
981 | add_dma_entry(entry); | |
982 | } | |
983 | EXPORT_SYMBOL(debug_dma_map_page); | |
984 | ||
985 | void debug_dma_unmap_page(struct device *dev, dma_addr_t addr, | |
986 | size_t size, int direction, bool map_single) | |
987 | { | |
988 | struct dma_debug_entry ref = { | |
989 | .type = dma_debug_page, | |
990 | .dev = dev, | |
991 | .dev_addr = addr, | |
992 | .size = size, | |
993 | .direction = direction, | |
994 | }; | |
995 | ||
996 | if (unlikely(global_disable)) | |
997 | return; | |
998 | ||
999 | if (map_single) | |
1000 | ref.type = dma_debug_single; | |
1001 | ||
1002 | check_unmap(&ref); | |
1003 | } | |
1004 | EXPORT_SYMBOL(debug_dma_unmap_page); | |
1005 | ||
972aa45c JR |
1006 | void debug_dma_map_sg(struct device *dev, struct scatterlist *sg, |
1007 | int nents, int mapped_ents, int direction) | |
1008 | { | |
1009 | struct dma_debug_entry *entry; | |
1010 | struct scatterlist *s; | |
1011 | int i; | |
1012 | ||
1013 | if (unlikely(global_disable)) | |
1014 | return; | |
1015 | ||
1016 | for_each_sg(sg, s, mapped_ents, i) { | |
1017 | entry = dma_entry_alloc(); | |
1018 | if (!entry) | |
1019 | return; | |
1020 | ||
1021 | entry->type = dma_debug_sg; | |
1022 | entry->dev = dev; | |
1023 | entry->paddr = sg_phys(s); | |
884d0597 | 1024 | entry->size = sg_dma_len(s); |
15aedea4 | 1025 | entry->dev_addr = sg_dma_address(s); |
972aa45c JR |
1026 | entry->direction = direction; |
1027 | entry->sg_call_ents = nents; | |
1028 | entry->sg_mapped_ents = mapped_ents; | |
1029 | ||
9537a48e JR |
1030 | if (!PageHighMem(sg_page(s))) { |
1031 | check_for_stack(dev, sg_virt(s)); | |
884d0597 | 1032 | check_for_illegal_area(dev, sg_virt(s), sg_dma_len(s)); |
9537a48e | 1033 | } |
972aa45c JR |
1034 | |
1035 | add_dma_entry(entry); | |
1036 | } | |
1037 | } | |
1038 | EXPORT_SYMBOL(debug_dma_map_sg); | |
1039 | ||
88f3907f FT |
1040 | static int get_nr_mapped_entries(struct device *dev, struct scatterlist *s) |
1041 | { | |
1042 | struct dma_debug_entry *entry; | |
1043 | struct hash_bucket *bucket; | |
1044 | unsigned long flags; | |
1045 | int mapped_ents = 0; | |
1046 | struct dma_debug_entry ref; | |
1047 | ||
1048 | ref.dev = dev; | |
1049 | ref.dev_addr = sg_dma_address(s); | |
1050 | ref.size = sg_dma_len(s), | |
1051 | ||
1052 | bucket = get_hash_bucket(&ref, &flags); | |
1053 | entry = hash_bucket_find(bucket, &ref); | |
1054 | if (entry) | |
1055 | mapped_ents = entry->sg_mapped_ents; | |
1056 | put_hash_bucket(bucket, &flags); | |
1057 | ||
1058 | return mapped_ents; | |
1059 | } | |
1060 | ||
972aa45c JR |
1061 | void debug_dma_unmap_sg(struct device *dev, struct scatterlist *sglist, |
1062 | int nelems, int dir) | |
1063 | { | |
972aa45c JR |
1064 | struct scatterlist *s; |
1065 | int mapped_ents = 0, i; | |
972aa45c JR |
1066 | |
1067 | if (unlikely(global_disable)) | |
1068 | return; | |
1069 | ||
1070 | for_each_sg(sglist, s, nelems, i) { | |
1071 | ||
1072 | struct dma_debug_entry ref = { | |
1073 | .type = dma_debug_sg, | |
1074 | .dev = dev, | |
1075 | .paddr = sg_phys(s), | |
15aedea4 | 1076 | .dev_addr = sg_dma_address(s), |
884d0597 | 1077 | .size = sg_dma_len(s), |
972aa45c JR |
1078 | .direction = dir, |
1079 | .sg_call_ents = 0, | |
1080 | }; | |
1081 | ||
1082 | if (mapped_ents && i >= mapped_ents) | |
1083 | break; | |
1084 | ||
88f3907f | 1085 | if (!i) { |
972aa45c | 1086 | ref.sg_call_ents = nelems; |
88f3907f | 1087 | mapped_ents = get_nr_mapped_entries(dev, s); |
972aa45c JR |
1088 | } |
1089 | ||
1090 | check_unmap(&ref); | |
1091 | } | |
1092 | } | |
1093 | EXPORT_SYMBOL(debug_dma_unmap_sg); | |
1094 | ||
6bfd4498 JR |
1095 | void debug_dma_alloc_coherent(struct device *dev, size_t size, |
1096 | dma_addr_t dma_addr, void *virt) | |
1097 | { | |
1098 | struct dma_debug_entry *entry; | |
1099 | ||
1100 | if (unlikely(global_disable)) | |
1101 | return; | |
1102 | ||
1103 | if (unlikely(virt == NULL)) | |
1104 | return; | |
1105 | ||
1106 | entry = dma_entry_alloc(); | |
1107 | if (!entry) | |
1108 | return; | |
1109 | ||
1110 | entry->type = dma_debug_coherent; | |
1111 | entry->dev = dev; | |
1112 | entry->paddr = virt_to_phys(virt); | |
1113 | entry->size = size; | |
1114 | entry->dev_addr = dma_addr; | |
1115 | entry->direction = DMA_BIDIRECTIONAL; | |
1116 | ||
1117 | add_dma_entry(entry); | |
1118 | } | |
1119 | EXPORT_SYMBOL(debug_dma_alloc_coherent); | |
1120 | ||
1121 | void debug_dma_free_coherent(struct device *dev, size_t size, | |
1122 | void *virt, dma_addr_t addr) | |
1123 | { | |
1124 | struct dma_debug_entry ref = { | |
1125 | .type = dma_debug_coherent, | |
1126 | .dev = dev, | |
1127 | .paddr = virt_to_phys(virt), | |
1128 | .dev_addr = addr, | |
1129 | .size = size, | |
1130 | .direction = DMA_BIDIRECTIONAL, | |
1131 | }; | |
1132 | ||
1133 | if (unlikely(global_disable)) | |
1134 | return; | |
1135 | ||
1136 | check_unmap(&ref); | |
1137 | } | |
1138 | EXPORT_SYMBOL(debug_dma_free_coherent); | |
1139 | ||
b9d2317e JR |
1140 | void debug_dma_sync_single_for_cpu(struct device *dev, dma_addr_t dma_handle, |
1141 | size_t size, int direction) | |
1142 | { | |
1143 | if (unlikely(global_disable)) | |
1144 | return; | |
1145 | ||
1146 | check_sync(dev, dma_handle, size, 0, direction, true); | |
1147 | } | |
1148 | EXPORT_SYMBOL(debug_dma_sync_single_for_cpu); | |
1149 | ||
1150 | void debug_dma_sync_single_for_device(struct device *dev, | |
1151 | dma_addr_t dma_handle, size_t size, | |
1152 | int direction) | |
1153 | { | |
1154 | if (unlikely(global_disable)) | |
1155 | return; | |
1156 | ||
1157 | check_sync(dev, dma_handle, size, 0, direction, false); | |
1158 | } | |
1159 | EXPORT_SYMBOL(debug_dma_sync_single_for_device); | |
1160 | ||
948408ba JR |
1161 | void debug_dma_sync_single_range_for_cpu(struct device *dev, |
1162 | dma_addr_t dma_handle, | |
1163 | unsigned long offset, size_t size, | |
1164 | int direction) | |
1165 | { | |
1166 | if (unlikely(global_disable)) | |
1167 | return; | |
1168 | ||
1169 | check_sync(dev, dma_handle, size, offset, direction, true); | |
1170 | } | |
1171 | EXPORT_SYMBOL(debug_dma_sync_single_range_for_cpu); | |
1172 | ||
1173 | void debug_dma_sync_single_range_for_device(struct device *dev, | |
1174 | dma_addr_t dma_handle, | |
1175 | unsigned long offset, | |
1176 | size_t size, int direction) | |
1177 | { | |
1178 | if (unlikely(global_disable)) | |
1179 | return; | |
1180 | ||
1181 | check_sync(dev, dma_handle, size, offset, direction, false); | |
1182 | } | |
1183 | EXPORT_SYMBOL(debug_dma_sync_single_range_for_device); | |
1184 | ||
a31fba5d JR |
1185 | void debug_dma_sync_sg_for_cpu(struct device *dev, struct scatterlist *sg, |
1186 | int nelems, int direction) | |
1187 | { | |
1188 | struct scatterlist *s; | |
88f3907f | 1189 | int mapped_ents = 0, i; |
a31fba5d JR |
1190 | |
1191 | if (unlikely(global_disable)) | |
1192 | return; | |
1193 | ||
1194 | for_each_sg(sg, s, nelems, i) { | |
88f3907f FT |
1195 | if (!i) |
1196 | mapped_ents = get_nr_mapped_entries(dev, s); | |
1197 | ||
1198 | if (i >= mapped_ents) | |
1199 | break; | |
1200 | ||
884d0597 | 1201 | check_sync(dev, sg_dma_address(s), sg_dma_len(s), 0, |
15aedea4 | 1202 | direction, true); |
a31fba5d JR |
1203 | } |
1204 | } | |
1205 | EXPORT_SYMBOL(debug_dma_sync_sg_for_cpu); | |
1206 | ||
1207 | void debug_dma_sync_sg_for_device(struct device *dev, struct scatterlist *sg, | |
1208 | int nelems, int direction) | |
1209 | { | |
1210 | struct scatterlist *s; | |
88f3907f | 1211 | int mapped_ents = 0, i; |
a31fba5d JR |
1212 | |
1213 | if (unlikely(global_disable)) | |
1214 | return; | |
1215 | ||
1216 | for_each_sg(sg, s, nelems, i) { | |
88f3907f FT |
1217 | if (!i) |
1218 | mapped_ents = get_nr_mapped_entries(dev, s); | |
1219 | ||
1220 | if (i >= mapped_ents) | |
1221 | break; | |
1222 | ||
884d0597 | 1223 | check_sync(dev, sg_dma_address(s), sg_dma_len(s), 0, |
15aedea4 | 1224 | direction, false); |
a31fba5d JR |
1225 | } |
1226 | } | |
1227 | EXPORT_SYMBOL(debug_dma_sync_sg_for_device); | |
1228 | ||
1745de5e JR |
1229 | static int __init dma_debug_driver_setup(char *str) |
1230 | { | |
1231 | int i; | |
1232 | ||
1233 | for (i = 0; i < NAME_MAX_LEN - 1; ++i, ++str) { | |
1234 | current_driver_name[i] = *str; | |
1235 | if (*str == 0) | |
1236 | break; | |
1237 | } | |
1238 | ||
1239 | if (current_driver_name[0]) | |
1240 | printk(KERN_INFO "DMA-API: enable driver filter for " | |
1241 | "driver [%s]\n", current_driver_name); | |
1242 | ||
1243 | ||
1244 | return 1; | |
1245 | } | |
1246 | __setup("dma_debug_driver=", dma_debug_driver_setup); |