Root/
Source at commit cdde9cf73945d547acd3e96f9508c79e84ad0bf1 created 12 years 9 months ago. By Maarten ter Huurne, MMC: JZ4740: Added support for CPU frequency changing | |
---|---|
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 | |
20 | #include <linux/scatterlist.h> |
21 | #include <linux/dma-mapping.h> |
22 | #include <linux/stacktrace.h> |
23 | #include <linux/dma-debug.h> |
24 | #include <linux/spinlock.h> |
25 | #include <linux/debugfs.h> |
26 | #include <linux/uaccess.h> |
27 | #include <linux/export.h> |
28 | #include <linux/device.h> |
29 | #include <linux/types.h> |
30 | #include <linux/sched.h> |
31 | #include <linux/ctype.h> |
32 | #include <linux/list.h> |
33 | #include <linux/slab.h> |
34 | |
35 | #include <asm/sections.h> |
36 | |
37 | #define HASH_SIZE 1024ULL |
38 | #define HASH_FN_SHIFT 13 |
39 | #define HASH_FN_MASK (HASH_SIZE - 1) |
40 | |
41 | enum { |
42 | dma_debug_single, |
43 | dma_debug_page, |
44 | dma_debug_sg, |
45 | dma_debug_coherent, |
46 | }; |
47 | |
48 | #define DMA_DEBUG_STACKTRACE_ENTRIES 5 |
49 | |
50 | struct dma_debug_entry { |
51 | struct list_head list; |
52 | struct device *dev; |
53 | int type; |
54 | phys_addr_t paddr; |
55 | u64 dev_addr; |
56 | u64 size; |
57 | int direction; |
58 | int sg_call_ents; |
59 | int sg_mapped_ents; |
60 | #ifdef CONFIG_STACKTRACE |
61 | struct stack_trace stacktrace; |
62 | unsigned long st_entries[DMA_DEBUG_STACKTRACE_ENTRIES]; |
63 | #endif |
64 | }; |
65 | |
66 | typedef bool (*match_fn)(struct dma_debug_entry *, struct dma_debug_entry *); |
67 | |
68 | struct hash_bucket { |
69 | struct list_head list; |
70 | spinlock_t lock; |
71 | } ____cacheline_aligned_in_smp; |
72 | |
73 | /* Hash list to save the allocated dma addresses */ |
74 | static struct hash_bucket dma_entry_hash[HASH_SIZE]; |
75 | /* List of pre-allocated dma_debug_entry's */ |
76 | static LIST_HEAD(free_entries); |
77 | /* Lock for the list above */ |
78 | static DEFINE_SPINLOCK(free_entries_lock); |
79 | |
80 | /* Global disable flag - will be set in case of an error */ |
81 | static u32 global_disable __read_mostly; |
82 | |
83 | /* Global error count */ |
84 | static u32 error_count; |
85 | |
86 | /* Global error show enable*/ |
87 | static u32 show_all_errors __read_mostly; |
88 | /* Number of errors to show */ |
89 | static u32 show_num_errors = 1; |
90 | |
91 | static u32 num_free_entries; |
92 | static u32 min_free_entries; |
93 | static u32 nr_total_entries; |
94 | |
95 | /* number of preallocated entries requested by kernel cmdline */ |
96 | static u32 req_entries; |
97 | |
98 | /* debugfs dentry's for the stuff above */ |
99 | static struct dentry *dma_debug_dent __read_mostly; |
100 | static struct dentry *global_disable_dent __read_mostly; |
101 | static struct dentry *error_count_dent __read_mostly; |
102 | static struct dentry *show_all_errors_dent __read_mostly; |
103 | static struct dentry *show_num_errors_dent __read_mostly; |
104 | static struct dentry *num_free_entries_dent __read_mostly; |
105 | static struct dentry *min_free_entries_dent __read_mostly; |
106 | static struct dentry *filter_dent __read_mostly; |
107 | |
108 | /* per-driver filter related state */ |
109 | |
110 | #define NAME_MAX_LEN 64 |
111 | |
112 | static char current_driver_name[NAME_MAX_LEN] __read_mostly; |
113 | static struct device_driver *current_driver __read_mostly; |
114 | |
115 | static DEFINE_RWLOCK(driver_name_lock); |
116 | |
117 | static const char *type2name[4] = { "single", "page", |
118 | "scather-gather", "coherent" }; |
119 | |
120 | static const char *dir2name[4] = { "DMA_BIDIRECTIONAL", "DMA_TO_DEVICE", |
121 | "DMA_FROM_DEVICE", "DMA_NONE" }; |
122 | |
123 | /* little merge helper - remove it after the merge window */ |
124 | #ifndef BUS_NOTIFY_UNBOUND_DRIVER |
125 | #define BUS_NOTIFY_UNBOUND_DRIVER 0x0005 |
126 | #endif |
127 | |
128 | /* |
129 | * The access to some variables in this macro is racy. We can't use atomic_t |
130 | * here because all these variables are exported to debugfs. Some of them even |
131 | * writeable. This is also the reason why a lock won't help much. But anyway, |
132 | * the races are no big deal. Here is why: |
133 | * |
134 | * error_count: the addition is racy, but the worst thing that can happen is |
135 | * that we don't count some errors |
136 | * show_num_errors: the subtraction is racy. Also no big deal because in |
137 | * worst case this will result in one warning more in the |
138 | * system log than the user configured. This variable is |
139 | * writeable via debugfs. |
140 | */ |
141 | static inline void dump_entry_trace(struct dma_debug_entry *entry) |
142 | { |
143 | #ifdef CONFIG_STACKTRACE |
144 | if (entry) { |
145 | pr_warning("Mapped at:\n"); |
146 | print_stack_trace(&entry->stacktrace, 0); |
147 | } |
148 | #endif |
149 | } |
150 | |
151 | static bool driver_filter(struct device *dev) |
152 | { |
153 | struct device_driver *drv; |
154 | unsigned long flags; |
155 | bool ret; |
156 | |
157 | /* driver filter off */ |
158 | if (likely(!current_driver_name[0])) |
159 | return true; |
160 | |
161 | /* driver filter on and initialized */ |
162 | if (current_driver && dev && dev->driver == current_driver) |
163 | return true; |
164 | |
165 | /* driver filter on, but we can't filter on a NULL device... */ |
166 | if (!dev) |
167 | return false; |
168 | |
169 | if (current_driver || !current_driver_name[0]) |
170 | return false; |
171 | |
172 | /* driver filter on but not yet initialized */ |
173 | drv = dev->driver; |
174 | if (!drv) |
175 | return false; |
176 | |
177 | /* lock to protect against change of current_driver_name */ |
178 | read_lock_irqsave(&driver_name_lock, flags); |
179 | |
180 | ret = false; |
181 | if (drv->name && |
182 | strncmp(current_driver_name, drv->name, NAME_MAX_LEN - 1) == 0) { |
183 | current_driver = drv; |
184 | ret = true; |
185 | } |
186 | |
187 | read_unlock_irqrestore(&driver_name_lock, flags); |
188 | |
189 | return ret; |
190 | } |
191 | |
192 | #define err_printk(dev, entry, format, arg...) do { \ |
193 | error_count += 1; \ |
194 | if (driver_filter(dev) && \ |
195 | (show_all_errors || show_num_errors > 0)) { \ |
196 | WARN(1, "%s %s: " format, \ |
197 | dev ? dev_driver_string(dev) : "NULL", \ |
198 | dev ? dev_name(dev) : "NULL", ## arg); \ |
199 | dump_entry_trace(entry); \ |
200 | } \ |
201 | if (!show_all_errors && show_num_errors > 0) \ |
202 | show_num_errors -= 1; \ |
203 | } while (0); |
204 | |
205 | /* |
206 | * Hash related functions |
207 | * |
208 | * Every DMA-API request is saved into a struct dma_debug_entry. To |
209 | * have quick access to these structs they are stored into a hash. |
210 | */ |
211 | static int hash_fn(struct dma_debug_entry *entry) |
212 | { |
213 | /* |
214 | * Hash function is based on the dma address. |
215 | * We use bits 20-27 here as the index into the hash |
216 | */ |
217 | return (entry->dev_addr >> HASH_FN_SHIFT) & HASH_FN_MASK; |
218 | } |
219 | |
220 | /* |
221 | * Request exclusive access to a hash bucket for a given dma_debug_entry. |
222 | */ |
223 | static struct hash_bucket *get_hash_bucket(struct dma_debug_entry *entry, |
224 | unsigned long *flags) |
225 | { |
226 | int idx = hash_fn(entry); |
227 | unsigned long __flags; |
228 | |
229 | spin_lock_irqsave(&dma_entry_hash[idx].lock, __flags); |
230 | *flags = __flags; |
231 | return &dma_entry_hash[idx]; |
232 | } |
233 | |
234 | /* |
235 | * Give up exclusive access to the hash bucket |
236 | */ |
237 | static void put_hash_bucket(struct hash_bucket *bucket, |
238 | unsigned long *flags) |
239 | { |
240 | unsigned long __flags = *flags; |
241 | |
242 | spin_unlock_irqrestore(&bucket->lock, __flags); |
243 | } |
244 | |
245 | static bool exact_match(struct dma_debug_entry *a, struct dma_debug_entry *b) |
246 | { |
247 | return ((a->dev_addr == b->dev_addr) && |
248 | (a->dev == b->dev)) ? true : false; |
249 | } |
250 | |
251 | static bool containing_match(struct dma_debug_entry *a, |
252 | struct dma_debug_entry *b) |
253 | { |
254 | if (a->dev != b->dev) |
255 | return false; |
256 | |
257 | if ((b->dev_addr <= a->dev_addr) && |
258 | ((b->dev_addr + b->size) >= (a->dev_addr + a->size))) |
259 | return true; |
260 | |
261 | return false; |
262 | } |
263 | |
264 | /* |
265 | * Search a given entry in the hash bucket list |
266 | */ |
267 | static struct dma_debug_entry *__hash_bucket_find(struct hash_bucket *bucket, |
268 | struct dma_debug_entry *ref, |
269 | match_fn match) |
270 | { |
271 | struct dma_debug_entry *entry, *ret = NULL; |
272 | int matches = 0, match_lvl, last_lvl = 0; |
273 | |
274 | list_for_each_entry(entry, &bucket->list, list) { |
275 | if (!match(ref, entry)) |
276 | continue; |
277 | |
278 | /* |
279 | * Some drivers map the same physical address multiple |
280 | * times. Without a hardware IOMMU this results in the |
281 | * same device addresses being put into the dma-debug |
282 | * hash multiple times too. This can result in false |
283 | * positives being reported. Therefore we implement a |
284 | * best-fit algorithm here which returns the entry from |
285 | * the hash which fits best to the reference value |
286 | * instead of the first-fit. |
287 | */ |
288 | matches += 1; |
289 | match_lvl = 0; |
290 | entry->size == ref->size ? ++match_lvl : 0; |
291 | entry->type == ref->type ? ++match_lvl : 0; |
292 | entry->direction == ref->direction ? ++match_lvl : 0; |
293 | entry->sg_call_ents == ref->sg_call_ents ? ++match_lvl : 0; |
294 | |
295 | if (match_lvl == 4) { |
296 | /* perfect-fit - return the result */ |
297 | return entry; |
298 | } else if (match_lvl > last_lvl) { |
299 | /* |
300 | * We found an entry that fits better then the |
301 | * previous one |
302 | */ |
303 | last_lvl = match_lvl; |
304 | ret = entry; |
305 | } |
306 | } |
307 | |
308 | /* |
309 | * If we have multiple matches but no perfect-fit, just return |
310 | * NULL. |
311 | */ |
312 | ret = (matches == 1) ? ret : NULL; |
313 | |
314 | return ret; |
315 | } |
316 | |
317 | static struct dma_debug_entry *bucket_find_exact(struct hash_bucket *bucket, |
318 | struct dma_debug_entry *ref) |
319 | { |
320 | return __hash_bucket_find(bucket, ref, exact_match); |
321 | } |
322 | |
323 | static struct dma_debug_entry *bucket_find_contain(struct hash_bucket **bucket, |
324 | struct dma_debug_entry *ref, |
325 | unsigned long *flags) |
326 | { |
327 | |
328 | unsigned int max_range = dma_get_max_seg_size(ref->dev); |
329 | struct dma_debug_entry *entry, index = *ref; |
330 | unsigned int range = 0; |
331 | |
332 | while (range <= max_range) { |
333 | entry = __hash_bucket_find(*bucket, &index, containing_match); |
334 | |
335 | if (entry) |
336 | return entry; |
337 | |
338 | /* |
339 | * Nothing found, go back a hash bucket |
340 | */ |
341 | put_hash_bucket(*bucket, flags); |
342 | range += (1 << HASH_FN_SHIFT); |
343 | index.dev_addr -= (1 << HASH_FN_SHIFT); |
344 | *bucket = get_hash_bucket(&index, flags); |
345 | } |
346 | |
347 | return NULL; |
348 | } |
349 | |
350 | /* |
351 | * Add an entry to a hash bucket |
352 | */ |
353 | static void hash_bucket_add(struct hash_bucket *bucket, |
354 | struct dma_debug_entry *entry) |
355 | { |
356 | list_add_tail(&entry->list, &bucket->list); |
357 | } |
358 | |
359 | /* |
360 | * Remove entry from a hash bucket list |
361 | */ |
362 | static void hash_bucket_del(struct dma_debug_entry *entry) |
363 | { |
364 | list_del(&entry->list); |
365 | } |
366 | |
367 | /* |
368 | * Dump mapping entries for debugging purposes |
369 | */ |
370 | void debug_dma_dump_mappings(struct device *dev) |
371 | { |
372 | int idx; |
373 | |
374 | for (idx = 0; idx < HASH_SIZE; idx++) { |
375 | struct hash_bucket *bucket = &dma_entry_hash[idx]; |
376 | struct dma_debug_entry *entry; |
377 | unsigned long flags; |
378 | |
379 | spin_lock_irqsave(&bucket->lock, flags); |
380 | |
381 | list_for_each_entry(entry, &bucket->list, list) { |
382 | if (!dev || dev == entry->dev) { |
383 | dev_info(entry->dev, |
384 | "%s idx %d P=%Lx D=%Lx L=%Lx %s\n", |
385 | type2name[entry->type], idx, |
386 | (unsigned long long)entry->paddr, |
387 | entry->dev_addr, entry->size, |
388 | dir2name[entry->direction]); |
389 | } |
390 | } |
391 | |
392 | spin_unlock_irqrestore(&bucket->lock, flags); |
393 | } |
394 | } |
395 | EXPORT_SYMBOL(debug_dma_dump_mappings); |
396 | |
397 | /* |
398 | * Wrapper function for adding an entry to the hash. |
399 | * This function takes care of locking itself. |
400 | */ |
401 | static void add_dma_entry(struct dma_debug_entry *entry) |
402 | { |
403 | struct hash_bucket *bucket; |
404 | unsigned long flags; |
405 | |
406 | bucket = get_hash_bucket(entry, &flags); |
407 | hash_bucket_add(bucket, entry); |
408 | put_hash_bucket(bucket, &flags); |
409 | } |
410 | |
411 | static struct dma_debug_entry *__dma_entry_alloc(void) |
412 | { |
413 | struct dma_debug_entry *entry; |
414 | |
415 | entry = list_entry(free_entries.next, struct dma_debug_entry, list); |
416 | list_del(&entry->list); |
417 | memset(entry, 0, sizeof(*entry)); |
418 | |
419 | num_free_entries -= 1; |
420 | if (num_free_entries < min_free_entries) |
421 | min_free_entries = num_free_entries; |
422 | |
423 | return entry; |
424 | } |
425 | |
426 | /* struct dma_entry allocator |
427 | * |
428 | * The next two functions implement the allocator for |
429 | * struct dma_debug_entries. |
430 | */ |
431 | static struct dma_debug_entry *dma_entry_alloc(void) |
432 | { |
433 | struct dma_debug_entry *entry; |
434 | unsigned long flags; |
435 | |
436 | spin_lock_irqsave(&free_entries_lock, flags); |
437 | |
438 | if (list_empty(&free_entries)) { |
439 | pr_err("DMA-API: debugging out of memory - disabling\n"); |
440 | global_disable = true; |
441 | spin_unlock_irqrestore(&free_entries_lock, flags); |
442 | return NULL; |
443 | } |
444 | |
445 | entry = __dma_entry_alloc(); |
446 | |
447 | spin_unlock_irqrestore(&free_entries_lock, flags); |
448 | |
449 | #ifdef CONFIG_STACKTRACE |
450 | entry->stacktrace.max_entries = DMA_DEBUG_STACKTRACE_ENTRIES; |
451 | entry->stacktrace.entries = entry->st_entries; |
452 | entry->stacktrace.skip = 2; |
453 | save_stack_trace(&entry->stacktrace); |
454 | #endif |
455 | |
456 | return entry; |
457 | } |
458 | |
459 | static void dma_entry_free(struct dma_debug_entry *entry) |
460 | { |
461 | unsigned long flags; |
462 | |
463 | /* |
464 | * add to beginning of the list - this way the entries are |
465 | * more likely cache hot when they are reallocated. |
466 | */ |
467 | spin_lock_irqsave(&free_entries_lock, flags); |
468 | list_add(&entry->list, &free_entries); |
469 | num_free_entries += 1; |
470 | spin_unlock_irqrestore(&free_entries_lock, flags); |
471 | } |
472 | |
473 | int dma_debug_resize_entries(u32 num_entries) |
474 | { |
475 | int i, delta, ret = 0; |
476 | unsigned long flags; |
477 | struct dma_debug_entry *entry; |
478 | LIST_HEAD(tmp); |
479 | |
480 | spin_lock_irqsave(&free_entries_lock, flags); |
481 | |
482 | if (nr_total_entries < num_entries) { |
483 | delta = num_entries - nr_total_entries; |
484 | |
485 | spin_unlock_irqrestore(&free_entries_lock, flags); |
486 | |
487 | for (i = 0; i < delta; i++) { |
488 | entry = kzalloc(sizeof(*entry), GFP_KERNEL); |
489 | if (!entry) |
490 | break; |
491 | |
492 | list_add_tail(&entry->list, &tmp); |
493 | } |
494 | |
495 | spin_lock_irqsave(&free_entries_lock, flags); |
496 | |
497 | list_splice(&tmp, &free_entries); |
498 | nr_total_entries += i; |
499 | num_free_entries += i; |
500 | } else { |
501 | delta = nr_total_entries - num_entries; |
502 | |
503 | for (i = 0; i < delta && !list_empty(&free_entries); i++) { |
504 | entry = __dma_entry_alloc(); |
505 | kfree(entry); |
506 | } |
507 | |
508 | nr_total_entries -= i; |
509 | } |
510 | |
511 | if (nr_total_entries != num_entries) |
512 | ret = 1; |
513 | |
514 | spin_unlock_irqrestore(&free_entries_lock, flags); |
515 | |
516 | return ret; |
517 | } |
518 | EXPORT_SYMBOL(dma_debug_resize_entries); |
519 | |
520 | /* |
521 | * DMA-API debugging init code |
522 | * |
523 | * The init code does two things: |
524 | * 1. Initialize core data structures |
525 | * 2. Preallocate a given number of dma_debug_entry structs |
526 | */ |
527 | |
528 | static int prealloc_memory(u32 num_entries) |
529 | { |
530 | struct dma_debug_entry *entry, *next_entry; |
531 | int i; |
532 | |
533 | for (i = 0; i < num_entries; ++i) { |
534 | entry = kzalloc(sizeof(*entry), GFP_KERNEL); |
535 | if (!entry) |
536 | goto out_err; |
537 | |
538 | list_add_tail(&entry->list, &free_entries); |
539 | } |
540 | |
541 | num_free_entries = num_entries; |
542 | min_free_entries = num_entries; |
543 | |
544 | pr_info("DMA-API: preallocated %d debug entries\n", num_entries); |
545 | |
546 | return 0; |
547 | |
548 | out_err: |
549 | |
550 | list_for_each_entry_safe(entry, next_entry, &free_entries, list) { |
551 | list_del(&entry->list); |
552 | kfree(entry); |
553 | } |
554 | |
555 | return -ENOMEM; |
556 | } |
557 | |
558 | static ssize_t filter_read(struct file *file, char __user *user_buf, |
559 | size_t count, loff_t *ppos) |
560 | { |
561 | char buf[NAME_MAX_LEN + 1]; |
562 | unsigned long flags; |
563 | int len; |
564 | |
565 | if (!current_driver_name[0]) |
566 | return 0; |
567 | |
568 | /* |
569 | * We can't copy to userspace directly because current_driver_name can |
570 | * only be read under the driver_name_lock with irqs disabled. So |
571 | * create a temporary copy first. |
572 | */ |
573 | read_lock_irqsave(&driver_name_lock, flags); |
574 | len = scnprintf(buf, NAME_MAX_LEN + 1, "%s\n", current_driver_name); |
575 | read_unlock_irqrestore(&driver_name_lock, flags); |
576 | |
577 | return simple_read_from_buffer(user_buf, count, ppos, buf, len); |
578 | } |
579 | |
580 | static ssize_t filter_write(struct file *file, const char __user *userbuf, |
581 | size_t count, loff_t *ppos) |
582 | { |
583 | char buf[NAME_MAX_LEN]; |
584 | unsigned long flags; |
585 | size_t len; |
586 | int i; |
587 | |
588 | /* |
589 | * We can't copy from userspace directly. Access to |
590 | * current_driver_name is protected with a write_lock with irqs |
591 | * disabled. Since copy_from_user can fault and may sleep we |
592 | * need to copy to temporary buffer first |
593 | */ |
594 | len = min(count, (size_t)(NAME_MAX_LEN - 1)); |
595 | if (copy_from_user(buf, userbuf, len)) |
596 | return -EFAULT; |
597 | |
598 | buf[len] = 0; |
599 | |
600 | write_lock_irqsave(&driver_name_lock, flags); |
601 | |
602 | /* |
603 | * Now handle the string we got from userspace very carefully. |
604 | * The rules are: |
605 | * - only use the first token we got |
606 | * - token delimiter is everything looking like a space |
607 | * character (' ', '\n', '\t' ...) |
608 | * |
609 | */ |
610 | if (!isalnum(buf[0])) { |
611 | /* |
612 | * If the first character userspace gave us is not |
613 | * alphanumerical then assume the filter should be |
614 | * switched off. |
615 | */ |
616 | if (current_driver_name[0]) |
617 | pr_info("DMA-API: switching off dma-debug driver filter\n"); |
618 | current_driver_name[0] = 0; |
619 | current_driver = NULL; |
620 | goto out_unlock; |
621 | } |
622 | |
623 | /* |
624 | * Now parse out the first token and use it as the name for the |
625 | * driver to filter for. |
626 | */ |
627 | for (i = 0; i < NAME_MAX_LEN - 1; ++i) { |
628 | current_driver_name[i] = buf[i]; |
629 | if (isspace(buf[i]) || buf[i] == ' ' || buf[i] == 0) |
630 | break; |
631 | } |
632 | current_driver_name[i] = 0; |
633 | current_driver = NULL; |
634 | |
635 | pr_info("DMA-API: enable driver filter for driver [%s]\n", |
636 | current_driver_name); |
637 | |
638 | out_unlock: |
639 | write_unlock_irqrestore(&driver_name_lock, flags); |
640 | |
641 | return count; |
642 | } |
643 | |
644 | static const struct file_operations filter_fops = { |
645 | .read = filter_read, |
646 | .write = filter_write, |
647 | .llseek = default_llseek, |
648 | }; |
649 | |
650 | static int dma_debug_fs_init(void) |
651 | { |
652 | dma_debug_dent = debugfs_create_dir("dma-api", NULL); |
653 | if (!dma_debug_dent) { |
654 | pr_err("DMA-API: can not create debugfs directory\n"); |
655 | return -ENOMEM; |
656 | } |
657 | |
658 | global_disable_dent = debugfs_create_bool("disabled", 0444, |
659 | dma_debug_dent, |
660 | &global_disable); |
661 | if (!global_disable_dent) |
662 | goto out_err; |
663 | |
664 | error_count_dent = debugfs_create_u32("error_count", 0444, |
665 | dma_debug_dent, &error_count); |
666 | if (!error_count_dent) |
667 | goto out_err; |
668 | |
669 | show_all_errors_dent = debugfs_create_u32("all_errors", 0644, |
670 | dma_debug_dent, |
671 | &show_all_errors); |
672 | if (!show_all_errors_dent) |
673 | goto out_err; |
674 | |
675 | show_num_errors_dent = debugfs_create_u32("num_errors", 0644, |
676 | dma_debug_dent, |
677 | &show_num_errors); |
678 | if (!show_num_errors_dent) |
679 | goto out_err; |
680 | |
681 | num_free_entries_dent = debugfs_create_u32("num_free_entries", 0444, |
682 | dma_debug_dent, |
683 | &num_free_entries); |
684 | if (!num_free_entries_dent) |
685 | goto out_err; |
686 | |
687 | min_free_entries_dent = debugfs_create_u32("min_free_entries", 0444, |
688 | dma_debug_dent, |
689 | &min_free_entries); |
690 | if (!min_free_entries_dent) |
691 | goto out_err; |
692 | |
693 | filter_dent = debugfs_create_file("driver_filter", 0644, |
694 | dma_debug_dent, NULL, &filter_fops); |
695 | if (!filter_dent) |
696 | goto out_err; |
697 | |
698 | return 0; |
699 | |
700 | out_err: |
701 | debugfs_remove_recursive(dma_debug_dent); |
702 | |
703 | return -ENOMEM; |
704 | } |
705 | |
706 | static int device_dma_allocations(struct device *dev, struct dma_debug_entry **out_entry) |
707 | { |
708 | struct dma_debug_entry *entry; |
709 | unsigned long flags; |
710 | int count = 0, i; |
711 | |
712 | local_irq_save(flags); |
713 | |
714 | for (i = 0; i < HASH_SIZE; ++i) { |
715 | spin_lock(&dma_entry_hash[i].lock); |
716 | list_for_each_entry(entry, &dma_entry_hash[i].list, list) { |
717 | if (entry->dev == dev) { |
718 | count += 1; |
719 | *out_entry = entry; |
720 | } |
721 | } |
722 | spin_unlock(&dma_entry_hash[i].lock); |
723 | } |
724 | |
725 | local_irq_restore(flags); |
726 | |
727 | return count; |
728 | } |
729 | |
730 | static int dma_debug_device_change(struct notifier_block *nb, unsigned long action, void *data) |
731 | { |
732 | struct device *dev = data; |
733 | struct dma_debug_entry *uninitialized_var(entry); |
734 | int count; |
735 | |
736 | if (global_disable) |
737 | return 0; |
738 | |
739 | switch (action) { |
740 | case BUS_NOTIFY_UNBOUND_DRIVER: |
741 | count = device_dma_allocations(dev, &entry); |
742 | if (count == 0) |
743 | break; |
744 | err_printk(dev, entry, "DMA-API: device driver has pending " |
745 | "DMA allocations while released from device " |
746 | "[count=%d]\n" |
747 | "One of leaked entries details: " |
748 | "[device address=0x%016llx] [size=%llu bytes] " |
749 | "[mapped with %s] [mapped as %s]\n", |
750 | count, entry->dev_addr, entry->size, |
751 | dir2name[entry->direction], type2name[entry->type]); |
752 | break; |
753 | default: |
754 | break; |
755 | } |
756 | |
757 | return 0; |
758 | } |
759 | |
760 | void dma_debug_add_bus(struct bus_type *bus) |
761 | { |
762 | struct notifier_block *nb; |
763 | |
764 | if (global_disable) |
765 | return; |
766 | |
767 | nb = kzalloc(sizeof(struct notifier_block), GFP_KERNEL); |
768 | if (nb == NULL) { |
769 | pr_err("dma_debug_add_bus: out of memory\n"); |
770 | return; |
771 | } |
772 | |
773 | nb->notifier_call = dma_debug_device_change; |
774 | |
775 | bus_register_notifier(bus, nb); |
776 | } |
777 | |
778 | /* |
779 | * Let the architectures decide how many entries should be preallocated. |
780 | */ |
781 | void dma_debug_init(u32 num_entries) |
782 | { |
783 | int i; |
784 | |
785 | if (global_disable) |
786 | return; |
787 | |
788 | for (i = 0; i < HASH_SIZE; ++i) { |
789 | INIT_LIST_HEAD(&dma_entry_hash[i].list); |
790 | spin_lock_init(&dma_entry_hash[i].lock); |
791 | } |
792 | |
793 | if (dma_debug_fs_init() != 0) { |
794 | pr_err("DMA-API: error creating debugfs entries - disabling\n"); |
795 | global_disable = true; |
796 | |
797 | return; |
798 | } |
799 | |
800 | if (req_entries) |
801 | num_entries = req_entries; |
802 | |
803 | if (prealloc_memory(num_entries) != 0) { |
804 | pr_err("DMA-API: debugging out of memory error - disabled\n"); |
805 | global_disable = true; |
806 | |
807 | return; |
808 | } |
809 | |
810 | nr_total_entries = num_free_entries; |
811 | |
812 | pr_info("DMA-API: debugging enabled by kernel config\n"); |
813 | } |
814 | |
815 | static __init int dma_debug_cmdline(char *str) |
816 | { |
817 | if (!str) |
818 | return -EINVAL; |
819 | |
820 | if (strncmp(str, "off", 3) == 0) { |
821 | pr_info("DMA-API: debugging disabled on kernel command line\n"); |
822 | global_disable = true; |
823 | } |
824 | |
825 | return 0; |
826 | } |
827 | |
828 | static __init int dma_debug_entries_cmdline(char *str) |
829 | { |
830 | int res; |
831 | |
832 | if (!str) |
833 | return -EINVAL; |
834 | |
835 | res = get_option(&str, &req_entries); |
836 | |
837 | if (!res) |
838 | req_entries = 0; |
839 | |
840 | return 0; |
841 | } |
842 | |
843 | __setup("dma_debug=", dma_debug_cmdline); |
844 | __setup("dma_debug_entries=", dma_debug_entries_cmdline); |
845 | |
846 | static void check_unmap(struct dma_debug_entry *ref) |
847 | { |
848 | struct dma_debug_entry *entry; |
849 | struct hash_bucket *bucket; |
850 | unsigned long flags; |
851 | |
852 | if (dma_mapping_error(ref->dev, ref->dev_addr)) { |
853 | err_printk(ref->dev, NULL, "DMA-API: device driver tries " |
854 | "to free an invalid DMA memory address\n"); |
855 | return; |
856 | } |
857 | |
858 | bucket = get_hash_bucket(ref, &flags); |
859 | entry = bucket_find_exact(bucket, ref); |
860 | |
861 | if (!entry) { |
862 | err_printk(ref->dev, NULL, "DMA-API: device driver tries " |
863 | "to free DMA memory it has not allocated " |
864 | "[device address=0x%016llx] [size=%llu bytes]\n", |
865 | ref->dev_addr, ref->size); |
866 | goto out; |
867 | } |
868 | |
869 | if (ref->size != entry->size) { |
870 | err_printk(ref->dev, entry, "DMA-API: device driver frees " |
871 | "DMA memory with different size " |
872 | "[device address=0x%016llx] [map size=%llu bytes] " |
873 | "[unmap size=%llu bytes]\n", |
874 | ref->dev_addr, entry->size, ref->size); |
875 | } |
876 | |
877 | if (ref->type != entry->type) { |
878 | err_printk(ref->dev, entry, "DMA-API: device driver frees " |
879 | "DMA memory with wrong function " |
880 | "[device address=0x%016llx] [size=%llu bytes] " |
881 | "[mapped as %s] [unmapped as %s]\n", |
882 | ref->dev_addr, ref->size, |
883 | type2name[entry->type], type2name[ref->type]); |
884 | } else if ((entry->type == dma_debug_coherent) && |
885 | (ref->paddr != entry->paddr)) { |
886 | err_printk(ref->dev, entry, "DMA-API: device driver frees " |
887 | "DMA memory with different CPU address " |
888 | "[device address=0x%016llx] [size=%llu bytes] " |
889 | "[cpu alloc address=0x%016llx] " |
890 | "[cpu free address=0x%016llx]", |
891 | ref->dev_addr, ref->size, |
892 | (unsigned long long)entry->paddr, |
893 | (unsigned long long)ref->paddr); |
894 | } |
895 | |
896 | if (ref->sg_call_ents && ref->type == dma_debug_sg && |
897 | ref->sg_call_ents != entry->sg_call_ents) { |
898 | err_printk(ref->dev, entry, "DMA-API: device driver frees " |
899 | "DMA sg list with different entry count " |
900 | "[map count=%d] [unmap count=%d]\n", |
901 | entry->sg_call_ents, ref->sg_call_ents); |
902 | } |
903 | |
904 | /* |
905 | * This may be no bug in reality - but most implementations of the |
906 | * DMA API don't handle this properly, so check for it here |
907 | */ |
908 | if (ref->direction != entry->direction) { |
909 | err_printk(ref->dev, entry, "DMA-API: device driver frees " |
910 | "DMA memory with different direction " |
911 | "[device address=0x%016llx] [size=%llu bytes] " |
912 | "[mapped with %s] [unmapped with %s]\n", |
913 | ref->dev_addr, ref->size, |
914 | dir2name[entry->direction], |
915 | dir2name[ref->direction]); |
916 | } |
917 | |
918 | hash_bucket_del(entry); |
919 | dma_entry_free(entry); |
920 | |
921 | out: |
922 | put_hash_bucket(bucket, &flags); |
923 | } |
924 | |
925 | static void check_for_stack(struct device *dev, void *addr) |
926 | { |
927 | if (object_is_on_stack(addr)) |
928 | err_printk(dev, NULL, "DMA-API: device driver maps memory from" |
929 | "stack [addr=%p]\n", addr); |
930 | } |
931 | |
932 | static inline bool overlap(void *addr, unsigned long len, void *start, void *end) |
933 | { |
934 | unsigned long a1 = (unsigned long)addr; |
935 | unsigned long b1 = a1 + len; |
936 | unsigned long a2 = (unsigned long)start; |
937 | unsigned long b2 = (unsigned long)end; |
938 | |
939 | return !(b1 <= a2 || a1 >= b2); |
940 | } |
941 | |
942 | static void check_for_illegal_area(struct device *dev, void *addr, unsigned long len) |
943 | { |
944 | if (overlap(addr, len, _text, _etext) || |
945 | overlap(addr, len, __start_rodata, __end_rodata)) |
946 | err_printk(dev, NULL, "DMA-API: device driver maps memory from kernel text or rodata [addr=%p] [len=%lu]\n", addr, len); |
947 | } |
948 | |
949 | static void check_sync(struct device *dev, |
950 | struct dma_debug_entry *ref, |
951 | bool to_cpu) |
952 | { |
953 | struct dma_debug_entry *entry; |
954 | struct hash_bucket *bucket; |
955 | unsigned long flags; |
956 | |
957 | bucket = get_hash_bucket(ref, &flags); |
958 | |
959 | entry = bucket_find_contain(&bucket, ref, &flags); |
960 | |
961 | if (!entry) { |
962 | err_printk(dev, NULL, "DMA-API: device driver tries " |
963 | "to sync DMA memory it has not allocated " |
964 | "[device address=0x%016llx] [size=%llu bytes]\n", |
965 | (unsigned long long)ref->dev_addr, ref->size); |
966 | goto out; |
967 | } |
968 | |
969 | if (ref->size > entry->size) { |
970 | err_printk(dev, entry, "DMA-API: device driver syncs" |
971 | " DMA memory outside allocated range " |
972 | "[device address=0x%016llx] " |
973 | "[allocation size=%llu bytes] " |
974 | "[sync offset+size=%llu]\n", |
975 | entry->dev_addr, entry->size, |
976 | ref->size); |
977 | } |
978 | |
979 | if (entry->direction == DMA_BIDIRECTIONAL) |
980 | goto out; |
981 | |
982 | if (ref->direction != entry->direction) { |
983 | err_printk(dev, entry, "DMA-API: device driver syncs " |
984 | "DMA memory with different direction " |
985 | "[device address=0x%016llx] [size=%llu bytes] " |
986 | "[mapped with %s] [synced with %s]\n", |
987 | (unsigned long long)ref->dev_addr, entry->size, |
988 | dir2name[entry->direction], |
989 | dir2name[ref->direction]); |
990 | } |
991 | |
992 | if (to_cpu && !(entry->direction == DMA_FROM_DEVICE) && |
993 | !(ref->direction == DMA_TO_DEVICE)) |
994 | err_printk(dev, entry, "DMA-API: device driver syncs " |
995 | "device read-only DMA memory for cpu " |
996 | "[device address=0x%016llx] [size=%llu bytes] " |
997 | "[mapped with %s] [synced with %s]\n", |
998 | (unsigned long long)ref->dev_addr, entry->size, |
999 | dir2name[entry->direction], |
1000 | dir2name[ref->direction]); |
1001 | |
1002 | if (!to_cpu && !(entry->direction == DMA_TO_DEVICE) && |
1003 | !(ref->direction == DMA_FROM_DEVICE)) |
1004 | err_printk(dev, entry, "DMA-API: device driver syncs " |
1005 | "device write-only DMA memory to device " |
1006 | "[device address=0x%016llx] [size=%llu bytes] " |
1007 | "[mapped with %s] [synced with %s]\n", |
1008 | (unsigned long long)ref->dev_addr, entry->size, |
1009 | dir2name[entry->direction], |
1010 | dir2name[ref->direction]); |
1011 | |
1012 | out: |
1013 | put_hash_bucket(bucket, &flags); |
1014 | } |
1015 | |
1016 | void debug_dma_map_page(struct device *dev, struct page *page, size_t offset, |
1017 | size_t size, int direction, dma_addr_t dma_addr, |
1018 | bool map_single) |
1019 | { |
1020 | struct dma_debug_entry *entry; |
1021 | |
1022 | if (unlikely(global_disable)) |
1023 | return; |
1024 | |
1025 | if (unlikely(dma_mapping_error(dev, dma_addr))) |
1026 | return; |
1027 | |
1028 | entry = dma_entry_alloc(); |
1029 | if (!entry) |
1030 | return; |
1031 | |
1032 | entry->dev = dev; |
1033 | entry->type = dma_debug_page; |
1034 | entry->paddr = page_to_phys(page) + offset; |
1035 | entry->dev_addr = dma_addr; |
1036 | entry->size = size; |
1037 | entry->direction = direction; |
1038 | |
1039 | if (map_single) |
1040 | entry->type = dma_debug_single; |
1041 | |
1042 | if (!PageHighMem(page)) { |
1043 | void *addr = page_address(page) + offset; |
1044 | |
1045 | check_for_stack(dev, addr); |
1046 | check_for_illegal_area(dev, addr, size); |
1047 | } |
1048 | |
1049 | add_dma_entry(entry); |
1050 | } |
1051 | EXPORT_SYMBOL(debug_dma_map_page); |
1052 | |
1053 | void debug_dma_unmap_page(struct device *dev, dma_addr_t addr, |
1054 | size_t size, int direction, bool map_single) |
1055 | { |
1056 | struct dma_debug_entry ref = { |
1057 | .type = dma_debug_page, |
1058 | .dev = dev, |
1059 | .dev_addr = addr, |
1060 | .size = size, |
1061 | .direction = direction, |
1062 | }; |
1063 | |
1064 | if (unlikely(global_disable)) |
1065 | return; |
1066 | |
1067 | if (map_single) |
1068 | ref.type = dma_debug_single; |
1069 | |
1070 | check_unmap(&ref); |
1071 | } |
1072 | EXPORT_SYMBOL(debug_dma_unmap_page); |
1073 | |
1074 | void debug_dma_map_sg(struct device *dev, struct scatterlist *sg, |
1075 | int nents, int mapped_ents, int direction) |
1076 | { |
1077 | struct dma_debug_entry *entry; |
1078 | struct scatterlist *s; |
1079 | int i; |
1080 | |
1081 | if (unlikely(global_disable)) |
1082 | return; |
1083 | |
1084 | for_each_sg(sg, s, mapped_ents, i) { |
1085 | entry = dma_entry_alloc(); |
1086 | if (!entry) |
1087 | return; |
1088 | |
1089 | entry->type = dma_debug_sg; |
1090 | entry->dev = dev; |
1091 | entry->paddr = sg_phys(s); |
1092 | entry->size = sg_dma_len(s); |
1093 | entry->dev_addr = sg_dma_address(s); |
1094 | entry->direction = direction; |
1095 | entry->sg_call_ents = nents; |
1096 | entry->sg_mapped_ents = mapped_ents; |
1097 | |
1098 | if (!PageHighMem(sg_page(s))) { |
1099 | check_for_stack(dev, sg_virt(s)); |
1100 | check_for_illegal_area(dev, sg_virt(s), sg_dma_len(s)); |
1101 | } |
1102 | |
1103 | add_dma_entry(entry); |
1104 | } |
1105 | } |
1106 | EXPORT_SYMBOL(debug_dma_map_sg); |
1107 | |
1108 | static int get_nr_mapped_entries(struct device *dev, |
1109 | struct dma_debug_entry *ref) |
1110 | { |
1111 | struct dma_debug_entry *entry; |
1112 | struct hash_bucket *bucket; |
1113 | unsigned long flags; |
1114 | int mapped_ents; |
1115 | |
1116 | bucket = get_hash_bucket(ref, &flags); |
1117 | entry = bucket_find_exact(bucket, ref); |
1118 | mapped_ents = 0; |
1119 | |
1120 | if (entry) |
1121 | mapped_ents = entry->sg_mapped_ents; |
1122 | put_hash_bucket(bucket, &flags); |
1123 | |
1124 | return mapped_ents; |
1125 | } |
1126 | |
1127 | void debug_dma_unmap_sg(struct device *dev, struct scatterlist *sglist, |
1128 | int nelems, int dir) |
1129 | { |
1130 | struct scatterlist *s; |
1131 | int mapped_ents = 0, i; |
1132 | |
1133 | if (unlikely(global_disable)) |
1134 | return; |
1135 | |
1136 | for_each_sg(sglist, s, nelems, i) { |
1137 | |
1138 | struct dma_debug_entry ref = { |
1139 | .type = dma_debug_sg, |
1140 | .dev = dev, |
1141 | .paddr = sg_phys(s), |
1142 | .dev_addr = sg_dma_address(s), |
1143 | .size = sg_dma_len(s), |
1144 | .direction = dir, |
1145 | .sg_call_ents = nelems, |
1146 | }; |
1147 | |
1148 | if (mapped_ents && i >= mapped_ents) |
1149 | break; |
1150 | |
1151 | if (!i) |
1152 | mapped_ents = get_nr_mapped_entries(dev, &ref); |
1153 | |
1154 | check_unmap(&ref); |
1155 | } |
1156 | } |
1157 | EXPORT_SYMBOL(debug_dma_unmap_sg); |
1158 | |
1159 | void debug_dma_alloc_coherent(struct device *dev, size_t size, |
1160 | dma_addr_t dma_addr, void *virt) |
1161 | { |
1162 | struct dma_debug_entry *entry; |
1163 | |
1164 | if (unlikely(global_disable)) |
1165 | return; |
1166 | |
1167 | if (unlikely(virt == NULL)) |
1168 | return; |
1169 | |
1170 | entry = dma_entry_alloc(); |
1171 | if (!entry) |
1172 | return; |
1173 | |
1174 | entry->type = dma_debug_coherent; |
1175 | entry->dev = dev; |
1176 | entry->paddr = virt_to_phys(virt); |
1177 | entry->size = size; |
1178 | entry->dev_addr = dma_addr; |
1179 | entry->direction = DMA_BIDIRECTIONAL; |
1180 | |
1181 | add_dma_entry(entry); |
1182 | } |
1183 | EXPORT_SYMBOL(debug_dma_alloc_coherent); |
1184 | |
1185 | void debug_dma_free_coherent(struct device *dev, size_t size, |
1186 | void *virt, dma_addr_t addr) |
1187 | { |
1188 | struct dma_debug_entry ref = { |
1189 | .type = dma_debug_coherent, |
1190 | .dev = dev, |
1191 | .paddr = virt_to_phys(virt), |
1192 | .dev_addr = addr, |
1193 | .size = size, |
1194 | .direction = DMA_BIDIRECTIONAL, |
1195 | }; |
1196 | |
1197 | if (unlikely(global_disable)) |
1198 | return; |
1199 | |
1200 | check_unmap(&ref); |
1201 | } |
1202 | EXPORT_SYMBOL(debug_dma_free_coherent); |
1203 | |
1204 | void debug_dma_sync_single_for_cpu(struct device *dev, dma_addr_t dma_handle, |
1205 | size_t size, int direction) |
1206 | { |
1207 | struct dma_debug_entry ref; |
1208 | |
1209 | if (unlikely(global_disable)) |
1210 | return; |
1211 | |
1212 | ref.type = dma_debug_single; |
1213 | ref.dev = dev; |
1214 | ref.dev_addr = dma_handle; |
1215 | ref.size = size; |
1216 | ref.direction = direction; |
1217 | ref.sg_call_ents = 0; |
1218 | |
1219 | check_sync(dev, &ref, true); |
1220 | } |
1221 | EXPORT_SYMBOL(debug_dma_sync_single_for_cpu); |
1222 | |
1223 | void debug_dma_sync_single_for_device(struct device *dev, |
1224 | dma_addr_t dma_handle, size_t size, |
1225 | int direction) |
1226 | { |
1227 | struct dma_debug_entry ref; |
1228 | |
1229 | if (unlikely(global_disable)) |
1230 | return; |
1231 | |
1232 | ref.type = dma_debug_single; |
1233 | ref.dev = dev; |
1234 | ref.dev_addr = dma_handle; |
1235 | ref.size = size; |
1236 | ref.direction = direction; |
1237 | ref.sg_call_ents = 0; |
1238 | |
1239 | check_sync(dev, &ref, false); |
1240 | } |
1241 | EXPORT_SYMBOL(debug_dma_sync_single_for_device); |
1242 | |
1243 | void debug_dma_sync_single_range_for_cpu(struct device *dev, |
1244 | dma_addr_t dma_handle, |
1245 | unsigned long offset, size_t size, |
1246 | int direction) |
1247 | { |
1248 | struct dma_debug_entry ref; |
1249 | |
1250 | if (unlikely(global_disable)) |
1251 | return; |
1252 | |
1253 | ref.type = dma_debug_single; |
1254 | ref.dev = dev; |
1255 | ref.dev_addr = dma_handle; |
1256 | ref.size = offset + size; |
1257 | ref.direction = direction; |
1258 | ref.sg_call_ents = 0; |
1259 | |
1260 | check_sync(dev, &ref, true); |
1261 | } |
1262 | EXPORT_SYMBOL(debug_dma_sync_single_range_for_cpu); |
1263 | |
1264 | void debug_dma_sync_single_range_for_device(struct device *dev, |
1265 | dma_addr_t dma_handle, |
1266 | unsigned long offset, |
1267 | size_t size, int direction) |
1268 | { |
1269 | struct dma_debug_entry ref; |
1270 | |
1271 | if (unlikely(global_disable)) |
1272 | return; |
1273 | |
1274 | ref.type = dma_debug_single; |
1275 | ref.dev = dev; |
1276 | ref.dev_addr = dma_handle; |
1277 | ref.size = offset + size; |
1278 | ref.direction = direction; |
1279 | ref.sg_call_ents = 0; |
1280 | |
1281 | check_sync(dev, &ref, false); |
1282 | } |
1283 | EXPORT_SYMBOL(debug_dma_sync_single_range_for_device); |
1284 | |
1285 | void debug_dma_sync_sg_for_cpu(struct device *dev, struct scatterlist *sg, |
1286 | int nelems, int direction) |
1287 | { |
1288 | struct scatterlist *s; |
1289 | int mapped_ents = 0, i; |
1290 | |
1291 | if (unlikely(global_disable)) |
1292 | return; |
1293 | |
1294 | for_each_sg(sg, s, nelems, i) { |
1295 | |
1296 | struct dma_debug_entry ref = { |
1297 | .type = dma_debug_sg, |
1298 | .dev = dev, |
1299 | .paddr = sg_phys(s), |
1300 | .dev_addr = sg_dma_address(s), |
1301 | .size = sg_dma_len(s), |
1302 | .direction = direction, |
1303 | .sg_call_ents = nelems, |
1304 | }; |
1305 | |
1306 | if (!i) |
1307 | mapped_ents = get_nr_mapped_entries(dev, &ref); |
1308 | |
1309 | if (i >= mapped_ents) |
1310 | break; |
1311 | |
1312 | check_sync(dev, &ref, true); |
1313 | } |
1314 | } |
1315 | EXPORT_SYMBOL(debug_dma_sync_sg_for_cpu); |
1316 | |
1317 | void debug_dma_sync_sg_for_device(struct device *dev, struct scatterlist *sg, |
1318 | int nelems, int direction) |
1319 | { |
1320 | struct scatterlist *s; |
1321 | int mapped_ents = 0, i; |
1322 | |
1323 | if (unlikely(global_disable)) |
1324 | return; |
1325 | |
1326 | for_each_sg(sg, s, nelems, i) { |
1327 | |
1328 | struct dma_debug_entry ref = { |
1329 | .type = dma_debug_sg, |
1330 | .dev = dev, |
1331 | .paddr = sg_phys(s), |
1332 | .dev_addr = sg_dma_address(s), |
1333 | .size = sg_dma_len(s), |
1334 | .direction = direction, |
1335 | .sg_call_ents = nelems, |
1336 | }; |
1337 | if (!i) |
1338 | mapped_ents = get_nr_mapped_entries(dev, &ref); |
1339 | |
1340 | if (i >= mapped_ents) |
1341 | break; |
1342 | |
1343 | check_sync(dev, &ref, false); |
1344 | } |
1345 | } |
1346 | EXPORT_SYMBOL(debug_dma_sync_sg_for_device); |
1347 | |
1348 | static int __init dma_debug_driver_setup(char *str) |
1349 | { |
1350 | int i; |
1351 | |
1352 | for (i = 0; i < NAME_MAX_LEN - 1; ++i, ++str) { |
1353 | current_driver_name[i] = *str; |
1354 | if (*str == 0) |
1355 | break; |
1356 | } |
1357 | |
1358 | if (current_driver_name[0]) |
1359 | pr_info("DMA-API: enable driver filter for driver [%s]\n", |
1360 | current_driver_name); |
1361 | |
1362 | |
1363 | return 1; |
1364 | } |
1365 | __setup("dma_debug_driver=", dma_debug_driver_setup); |
1366 |
Branches:
ben-wpan
ben-wpan-stefan
javiroman/ks7010
jz-2.6.34
jz-2.6.34-rc5
jz-2.6.34-rc6
jz-2.6.34-rc7
jz-2.6.35
jz-2.6.36
jz-2.6.37
jz-2.6.38
jz-2.6.39
jz-3.0
jz-3.1
jz-3.11
jz-3.12
jz-3.13
jz-3.15
jz-3.16
jz-3.18-dt
jz-3.2
jz-3.3
jz-3.4
jz-3.5
jz-3.6
jz-3.6-rc2-pwm
jz-3.9
jz-3.9-clk
jz-3.9-rc8
jz47xx
jz47xx-2.6.38
master
Tags:
od-2011-09-04
od-2011-09-18
v2.6.34-rc5
v2.6.34-rc6
v2.6.34-rc7
v3.9