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) { | |
e7ed70ee | 142 | pr_warning("Mapped at:\n"); |
6c132d1b DW |
143 | print_stack_trace(&entry->stacktrace, 0); |
144 | } | |
145 | #endif | |
146 | } | |
147 | ||
2e507d84 JR |
148 | static bool driver_filter(struct device *dev) |
149 | { | |
0bf84128 JR |
150 | struct device_driver *drv; |
151 | unsigned long flags; | |
152 | bool ret; | |
153 | ||
2e507d84 JR |
154 | /* driver filter off */ |
155 | if (likely(!current_driver_name[0])) | |
156 | return true; | |
157 | ||
158 | /* driver filter on and initialized */ | |
159 | if (current_driver && dev->driver == current_driver) | |
160 | return true; | |
161 | ||
0bf84128 JR |
162 | if (current_driver || !current_driver_name[0]) |
163 | return false; | |
2e507d84 | 164 | |
0bf84128 JR |
165 | /* driver filter on but not yet initialized */ |
166 | drv = get_driver(dev->driver); | |
167 | if (!drv) | |
168 | return false; | |
169 | ||
170 | /* lock to protect against change of current_driver_name */ | |
171 | read_lock_irqsave(&driver_name_lock, flags); | |
172 | ||
173 | ret = false; | |
174 | if (drv->name && | |
175 | strncmp(current_driver_name, drv->name, NAME_MAX_LEN - 1) == 0) { | |
176 | current_driver = drv; | |
177 | ret = true; | |
2e507d84 JR |
178 | } |
179 | ||
0bf84128 JR |
180 | read_unlock_irqrestore(&driver_name_lock, flags); |
181 | put_driver(drv); | |
182 | ||
183 | return ret; | |
2e507d84 JR |
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)) { | |
e7ed70ee | 380 | pr_err("DMA-API: debugging out of memory - disabling\n"); |
3b1e79ed JR |
381 | global_disable = true; |
382 | goto out; | |
383 | } | |
384 | ||
e6a1a89d | 385 | entry = __dma_entry_alloc(); |
3b1e79ed | 386 | |
6c132d1b DW |
387 | #ifdef CONFIG_STACKTRACE |
388 | entry->stacktrace.max_entries = DMA_DEBUG_STACKTRACE_ENTRIES; | |
389 | entry->stacktrace.entries = entry->st_entries; | |
390 | entry->stacktrace.skip = 2; | |
391 | save_stack_trace(&entry->stacktrace); | |
392 | #endif | |
3b1e79ed JR |
393 | |
394 | out: | |
395 | spin_unlock_irqrestore(&free_entries_lock, flags); | |
396 | ||
397 | return entry; | |
398 | } | |
399 | ||
400 | static void dma_entry_free(struct dma_debug_entry *entry) | |
401 | { | |
402 | unsigned long flags; | |
403 | ||
404 | /* | |
405 | * add to beginning of the list - this way the entries are | |
406 | * more likely cache hot when they are reallocated. | |
407 | */ | |
408 | spin_lock_irqsave(&free_entries_lock, flags); | |
409 | list_add(&entry->list, &free_entries); | |
410 | num_free_entries += 1; | |
411 | spin_unlock_irqrestore(&free_entries_lock, flags); | |
412 | } | |
413 | ||
e6a1a89d FT |
414 | int dma_debug_resize_entries(u32 num_entries) |
415 | { | |
416 | int i, delta, ret = 0; | |
417 | unsigned long flags; | |
418 | struct dma_debug_entry *entry; | |
419 | LIST_HEAD(tmp); | |
420 | ||
421 | spin_lock_irqsave(&free_entries_lock, flags); | |
422 | ||
423 | if (nr_total_entries < num_entries) { | |
424 | delta = num_entries - nr_total_entries; | |
425 | ||
426 | spin_unlock_irqrestore(&free_entries_lock, flags); | |
427 | ||
428 | for (i = 0; i < delta; i++) { | |
429 | entry = kzalloc(sizeof(*entry), GFP_KERNEL); | |
430 | if (!entry) | |
431 | break; | |
432 | ||
433 | list_add_tail(&entry->list, &tmp); | |
434 | } | |
435 | ||
436 | spin_lock_irqsave(&free_entries_lock, flags); | |
437 | ||
438 | list_splice(&tmp, &free_entries); | |
439 | nr_total_entries += i; | |
440 | num_free_entries += i; | |
441 | } else { | |
442 | delta = nr_total_entries - num_entries; | |
443 | ||
444 | for (i = 0; i < delta && !list_empty(&free_entries); i++) { | |
445 | entry = __dma_entry_alloc(); | |
446 | kfree(entry); | |
447 | } | |
448 | ||
449 | nr_total_entries -= i; | |
450 | } | |
451 | ||
452 | if (nr_total_entries != num_entries) | |
453 | ret = 1; | |
454 | ||
455 | spin_unlock_irqrestore(&free_entries_lock, flags); | |
456 | ||
457 | return ret; | |
458 | } | |
459 | EXPORT_SYMBOL(dma_debug_resize_entries); | |
460 | ||
6bf07871 JR |
461 | /* |
462 | * DMA-API debugging init code | |
463 | * | |
464 | * The init code does two things: | |
465 | * 1. Initialize core data structures | |
466 | * 2. Preallocate a given number of dma_debug_entry structs | |
467 | */ | |
468 | ||
469 | static int prealloc_memory(u32 num_entries) | |
470 | { | |
471 | struct dma_debug_entry *entry, *next_entry; | |
472 | int i; | |
473 | ||
474 | for (i = 0; i < num_entries; ++i) { | |
475 | entry = kzalloc(sizeof(*entry), GFP_KERNEL); | |
476 | if (!entry) | |
477 | goto out_err; | |
478 | ||
479 | list_add_tail(&entry->list, &free_entries); | |
480 | } | |
481 | ||
482 | num_free_entries = num_entries; | |
483 | min_free_entries = num_entries; | |
484 | ||
e7ed70ee | 485 | pr_info("DMA-API: preallocated %d debug entries\n", num_entries); |
6bf07871 JR |
486 | |
487 | return 0; | |
488 | ||
489 | out_err: | |
490 | ||
491 | list_for_each_entry_safe(entry, next_entry, &free_entries, list) { | |
492 | list_del(&entry->list); | |
493 | kfree(entry); | |
494 | } | |
495 | ||
496 | return -ENOMEM; | |
497 | } | |
498 | ||
8a6fc708 JR |
499 | static ssize_t filter_read(struct file *file, char __user *user_buf, |
500 | size_t count, loff_t *ppos) | |
501 | { | |
8a6fc708 | 502 | char buf[NAME_MAX_LEN + 1]; |
c17e2cf7 | 503 | unsigned long flags; |
8a6fc708 JR |
504 | int len; |
505 | ||
506 | if (!current_driver_name[0]) | |
507 | return 0; | |
508 | ||
509 | /* | |
510 | * We can't copy to userspace directly because current_driver_name can | |
511 | * only be read under the driver_name_lock with irqs disabled. So | |
512 | * create a temporary copy first. | |
513 | */ | |
514 | read_lock_irqsave(&driver_name_lock, flags); | |
515 | len = scnprintf(buf, NAME_MAX_LEN + 1, "%s\n", current_driver_name); | |
516 | read_unlock_irqrestore(&driver_name_lock, flags); | |
517 | ||
518 | return simple_read_from_buffer(user_buf, count, ppos, buf, len); | |
519 | } | |
520 | ||
521 | static ssize_t filter_write(struct file *file, const char __user *userbuf, | |
522 | size_t count, loff_t *ppos) | |
523 | { | |
8a6fc708 | 524 | char buf[NAME_MAX_LEN]; |
c17e2cf7 JR |
525 | unsigned long flags; |
526 | size_t len; | |
8a6fc708 JR |
527 | int i; |
528 | ||
529 | /* | |
530 | * We can't copy from userspace directly. Access to | |
531 | * current_driver_name is protected with a write_lock with irqs | |
532 | * disabled. Since copy_from_user can fault and may sleep we | |
533 | * need to copy to temporary buffer first | |
534 | */ | |
e7ed70ee | 535 | len = min(count, (size_t)(NAME_MAX_LEN - 1)); |
8a6fc708 JR |
536 | if (copy_from_user(buf, userbuf, len)) |
537 | return -EFAULT; | |
538 | ||
539 | buf[len] = 0; | |
540 | ||
541 | write_lock_irqsave(&driver_name_lock, flags); | |
542 | ||
31232509 JR |
543 | /* |
544 | * Now handle the string we got from userspace very carefully. | |
8a6fc708 JR |
545 | * The rules are: |
546 | * - only use the first token we got | |
547 | * - token delimiter is everything looking like a space | |
548 | * character (' ', '\n', '\t' ...) | |
549 | * | |
550 | */ | |
551 | if (!isalnum(buf[0])) { | |
552 | /* | |
31232509 | 553 | * If the first character userspace gave us is not |
8a6fc708 JR |
554 | * alphanumerical then assume the filter should be |
555 | * switched off. | |
556 | */ | |
557 | if (current_driver_name[0]) | |
e7ed70ee | 558 | pr_info("DMA-API: switching off dma-debug driver filter\n"); |
8a6fc708 JR |
559 | current_driver_name[0] = 0; |
560 | current_driver = NULL; | |
561 | goto out_unlock; | |
562 | } | |
563 | ||
564 | /* | |
565 | * Now parse out the first token and use it as the name for the | |
566 | * driver to filter for. | |
567 | */ | |
568 | for (i = 0; i < NAME_MAX_LEN; ++i) { | |
569 | current_driver_name[i] = buf[i]; | |
570 | if (isspace(buf[i]) || buf[i] == ' ' || buf[i] == 0) | |
571 | break; | |
572 | } | |
573 | current_driver_name[i] = 0; | |
574 | current_driver = NULL; | |
575 | ||
e7ed70ee JR |
576 | pr_info("DMA-API: enable driver filter for driver [%s]\n", |
577 | current_driver_name); | |
8a6fc708 JR |
578 | |
579 | out_unlock: | |
580 | write_unlock_irqrestore(&driver_name_lock, flags); | |
581 | ||
582 | return count; | |
583 | } | |
584 | ||
585 | const struct file_operations filter_fops = { | |
586 | .read = filter_read, | |
587 | .write = filter_write, | |
588 | }; | |
589 | ||
788dcfa6 JR |
590 | static int dma_debug_fs_init(void) |
591 | { | |
592 | dma_debug_dent = debugfs_create_dir("dma-api", NULL); | |
593 | if (!dma_debug_dent) { | |
e7ed70ee | 594 | pr_err("DMA-API: can not create debugfs directory\n"); |
788dcfa6 JR |
595 | return -ENOMEM; |
596 | } | |
597 | ||
598 | global_disable_dent = debugfs_create_bool("disabled", 0444, | |
599 | dma_debug_dent, | |
600 | (u32 *)&global_disable); | |
601 | if (!global_disable_dent) | |
602 | goto out_err; | |
603 | ||
604 | error_count_dent = debugfs_create_u32("error_count", 0444, | |
605 | dma_debug_dent, &error_count); | |
606 | if (!error_count_dent) | |
607 | goto out_err; | |
608 | ||
609 | show_all_errors_dent = debugfs_create_u32("all_errors", 0644, | |
610 | dma_debug_dent, | |
611 | &show_all_errors); | |
612 | if (!show_all_errors_dent) | |
613 | goto out_err; | |
614 | ||
615 | show_num_errors_dent = debugfs_create_u32("num_errors", 0644, | |
616 | dma_debug_dent, | |
617 | &show_num_errors); | |
618 | if (!show_num_errors_dent) | |
619 | goto out_err; | |
620 | ||
621 | num_free_entries_dent = debugfs_create_u32("num_free_entries", 0444, | |
622 | dma_debug_dent, | |
623 | &num_free_entries); | |
624 | if (!num_free_entries_dent) | |
625 | goto out_err; | |
626 | ||
627 | min_free_entries_dent = debugfs_create_u32("min_free_entries", 0444, | |
628 | dma_debug_dent, | |
629 | &min_free_entries); | |
630 | if (!min_free_entries_dent) | |
631 | goto out_err; | |
632 | ||
8a6fc708 JR |
633 | filter_dent = debugfs_create_file("driver_filter", 0644, |
634 | dma_debug_dent, NULL, &filter_fops); | |
635 | if (!filter_dent) | |
636 | goto out_err; | |
637 | ||
788dcfa6 JR |
638 | return 0; |
639 | ||
640 | out_err: | |
641 | debugfs_remove_recursive(dma_debug_dent); | |
642 | ||
643 | return -ENOMEM; | |
644 | } | |
645 | ||
ed888aef JR |
646 | static int device_dma_allocations(struct device *dev) |
647 | { | |
648 | struct dma_debug_entry *entry; | |
649 | unsigned long flags; | |
650 | int count = 0, i; | |
651 | ||
be81c6ea JR |
652 | local_irq_save(flags); |
653 | ||
ed888aef | 654 | for (i = 0; i < HASH_SIZE; ++i) { |
be81c6ea | 655 | spin_lock(&dma_entry_hash[i].lock); |
ed888aef JR |
656 | list_for_each_entry(entry, &dma_entry_hash[i].list, list) { |
657 | if (entry->dev == dev) | |
658 | count += 1; | |
659 | } | |
be81c6ea | 660 | spin_unlock(&dma_entry_hash[i].lock); |
ed888aef JR |
661 | } |
662 | ||
be81c6ea JR |
663 | local_irq_restore(flags); |
664 | ||
ed888aef JR |
665 | return count; |
666 | } | |
667 | ||
668 | static int dma_debug_device_change(struct notifier_block *nb, | |
669 | unsigned long action, void *data) | |
670 | { | |
671 | struct device *dev = data; | |
672 | int count; | |
673 | ||
674 | ||
675 | switch (action) { | |
676 | case BUS_NOTIFY_UNBOUND_DRIVER: | |
677 | count = device_dma_allocations(dev); | |
678 | if (count == 0) | |
679 | break; | |
680 | err_printk(dev, NULL, "DMA-API: device driver has pending " | |
681 | "DMA allocations while released from device " | |
682 | "[count=%d]\n", count); | |
683 | break; | |
684 | default: | |
685 | break; | |
686 | } | |
687 | ||
688 | return 0; | |
689 | } | |
690 | ||
41531c8f JR |
691 | void dma_debug_add_bus(struct bus_type *bus) |
692 | { | |
ed888aef JR |
693 | struct notifier_block *nb; |
694 | ||
695 | nb = kzalloc(sizeof(struct notifier_block), GFP_KERNEL); | |
696 | if (nb == NULL) { | |
e7ed70ee | 697 | pr_err("dma_debug_add_bus: out of memory\n"); |
ed888aef JR |
698 | return; |
699 | } | |
700 | ||
701 | nb->notifier_call = dma_debug_device_change; | |
702 | ||
703 | bus_register_notifier(bus, nb); | |
41531c8f | 704 | } |
788dcfa6 | 705 | |
6bf07871 JR |
706 | /* |
707 | * Let the architectures decide how many entries should be preallocated. | |
708 | */ | |
709 | void dma_debug_init(u32 num_entries) | |
710 | { | |
711 | int i; | |
712 | ||
713 | if (global_disable) | |
714 | return; | |
715 | ||
716 | for (i = 0; i < HASH_SIZE; ++i) { | |
717 | INIT_LIST_HEAD(&dma_entry_hash[i].list); | |
718 | dma_entry_hash[i].lock = SPIN_LOCK_UNLOCKED; | |
719 | } | |
720 | ||
788dcfa6 | 721 | if (dma_debug_fs_init() != 0) { |
e7ed70ee | 722 | pr_err("DMA-API: error creating debugfs entries - disabling\n"); |
788dcfa6 JR |
723 | global_disable = true; |
724 | ||
725 | return; | |
726 | } | |
727 | ||
59d3daaf JR |
728 | if (req_entries) |
729 | num_entries = req_entries; | |
730 | ||
6bf07871 | 731 | if (prealloc_memory(num_entries) != 0) { |
e7ed70ee | 732 | pr_err("DMA-API: debugging out of memory error - disabled\n"); |
6bf07871 JR |
733 | global_disable = true; |
734 | ||
735 | return; | |
736 | } | |
737 | ||
e6a1a89d FT |
738 | nr_total_entries = num_free_entries; |
739 | ||
e7ed70ee | 740 | pr_info("DMA-API: debugging enabled by kernel config\n"); |
6bf07871 JR |
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) { | |
e7ed70ee | 749 | pr_info("DMA-API: debugging disabled on kernel command line\n"); |
59d3daaf JR |
750 | global_disable = true; |
751 | } | |
752 | ||
753 | return 0; | |
754 | } | |
755 | ||
756 | static __init int dma_debug_entries_cmdline(char *str) | |
757 | { | |
758 | int res; | |
759 | ||
760 | if (!str) | |
761 | return -EINVAL; | |
762 | ||
763 | res = get_option(&str, &req_entries); | |
764 | ||
765 | if (!res) | |
766 | req_entries = 0; | |
767 | ||
768 | return 0; | |
769 | } | |
770 | ||
771 | __setup("dma_debug=", dma_debug_cmdline); | |
772 | __setup("dma_debug_entries=", dma_debug_entries_cmdline); | |
773 | ||
2d62ece1 JR |
774 | static void check_unmap(struct dma_debug_entry *ref) |
775 | { | |
776 | struct dma_debug_entry *entry; | |
777 | struct hash_bucket *bucket; | |
778 | unsigned long flags; | |
779 | ||
35d40952 FT |
780 | if (dma_mapping_error(ref->dev, ref->dev_addr)) { |
781 | err_printk(ref->dev, NULL, "DMA-API: device driver tries " | |
782 | "to free an invalid DMA memory address\n"); | |
2d62ece1 | 783 | return; |
35d40952 | 784 | } |
2d62ece1 JR |
785 | |
786 | bucket = get_hash_bucket(ref, &flags); | |
787 | entry = hash_bucket_find(bucket, ref); | |
788 | ||
789 | if (!entry) { | |
6c132d1b | 790 | err_printk(ref->dev, NULL, "DMA-API: device driver tries " |
2d62ece1 JR |
791 | "to free DMA memory it has not allocated " |
792 | "[device address=0x%016llx] [size=%llu bytes]\n", | |
793 | ref->dev_addr, ref->size); | |
794 | goto out; | |
795 | } | |
796 | ||
797 | if (ref->size != entry->size) { | |
6c132d1b | 798 | err_printk(ref->dev, entry, "DMA-API: device driver frees " |
2d62ece1 JR |
799 | "DMA memory with different size " |
800 | "[device address=0x%016llx] [map size=%llu bytes] " | |
801 | "[unmap size=%llu bytes]\n", | |
802 | ref->dev_addr, entry->size, ref->size); | |
803 | } | |
804 | ||
805 | if (ref->type != entry->type) { | |
6c132d1b | 806 | err_printk(ref->dev, entry, "DMA-API: device driver frees " |
2d62ece1 JR |
807 | "DMA memory with wrong function " |
808 | "[device address=0x%016llx] [size=%llu bytes] " | |
809 | "[mapped as %s] [unmapped as %s]\n", | |
810 | ref->dev_addr, ref->size, | |
811 | type2name[entry->type], type2name[ref->type]); | |
812 | } else if ((entry->type == dma_debug_coherent) && | |
813 | (ref->paddr != entry->paddr)) { | |
6c132d1b | 814 | err_printk(ref->dev, entry, "DMA-API: device driver frees " |
2d62ece1 JR |
815 | "DMA memory with different CPU address " |
816 | "[device address=0x%016llx] [size=%llu bytes] " | |
817 | "[cpu alloc address=%p] [cpu free address=%p]", | |
818 | ref->dev_addr, ref->size, | |
819 | (void *)entry->paddr, (void *)ref->paddr); | |
820 | } | |
821 | ||
822 | if (ref->sg_call_ents && ref->type == dma_debug_sg && | |
823 | ref->sg_call_ents != entry->sg_call_ents) { | |
6c132d1b | 824 | err_printk(ref->dev, entry, "DMA-API: device driver frees " |
2d62ece1 JR |
825 | "DMA sg list with different entry count " |
826 | "[map count=%d] [unmap count=%d]\n", | |
827 | entry->sg_call_ents, ref->sg_call_ents); | |
828 | } | |
829 | ||
830 | /* | |
831 | * This may be no bug in reality - but most implementations of the | |
832 | * DMA API don't handle this properly, so check for it here | |
833 | */ | |
834 | if (ref->direction != entry->direction) { | |
6c132d1b | 835 | err_printk(ref->dev, entry, "DMA-API: device driver frees " |
2d62ece1 JR |
836 | "DMA memory with different direction " |
837 | "[device address=0x%016llx] [size=%llu bytes] " | |
838 | "[mapped with %s] [unmapped with %s]\n", | |
839 | ref->dev_addr, ref->size, | |
840 | dir2name[entry->direction], | |
841 | dir2name[ref->direction]); | |
842 | } | |
843 | ||
844 | hash_bucket_del(entry); | |
845 | dma_entry_free(entry); | |
846 | ||
847 | out: | |
848 | put_hash_bucket(bucket, &flags); | |
849 | } | |
850 | ||
851 | static void check_for_stack(struct device *dev, void *addr) | |
852 | { | |
853 | if (object_is_on_stack(addr)) | |
6c132d1b DW |
854 | err_printk(dev, NULL, "DMA-API: device driver maps memory from" |
855 | "stack [addr=%p]\n", addr); | |
2d62ece1 JR |
856 | } |
857 | ||
2e34bde1 JR |
858 | static inline bool overlap(void *addr, u64 size, void *start, void *end) |
859 | { | |
860 | void *addr2 = (char *)addr + size; | |
861 | ||
862 | return ((addr >= start && addr < end) || | |
863 | (addr2 >= start && addr2 < end) || | |
864 | ((addr < start) && (addr2 >= end))); | |
865 | } | |
866 | ||
867 | static void check_for_illegal_area(struct device *dev, void *addr, u64 size) | |
868 | { | |
869 | if (overlap(addr, size, _text, _etext) || | |
870 | overlap(addr, size, __start_rodata, __end_rodata)) | |
871 | err_printk(dev, NULL, "DMA-API: device driver maps " | |
872 | "memory from kernel text or rodata " | |
873 | "[addr=%p] [size=%llu]\n", addr, size); | |
874 | } | |
875 | ||
2d62ece1 JR |
876 | static void check_sync(struct device *dev, dma_addr_t addr, |
877 | u64 size, u64 offset, int direction, bool to_cpu) | |
878 | { | |
879 | struct dma_debug_entry ref = { | |
880 | .dev = dev, | |
881 | .dev_addr = addr, | |
882 | .size = size, | |
883 | .direction = direction, | |
884 | }; | |
885 | struct dma_debug_entry *entry; | |
886 | struct hash_bucket *bucket; | |
887 | unsigned long flags; | |
888 | ||
889 | bucket = get_hash_bucket(&ref, &flags); | |
890 | ||
891 | entry = hash_bucket_find(bucket, &ref); | |
892 | ||
893 | if (!entry) { | |
6c132d1b | 894 | err_printk(dev, NULL, "DMA-API: device driver tries " |
2d62ece1 JR |
895 | "to sync DMA memory it has not allocated " |
896 | "[device address=0x%016llx] [size=%llu bytes]\n", | |
93c36ed8 | 897 | (unsigned long long)addr, size); |
2d62ece1 JR |
898 | goto out; |
899 | } | |
900 | ||
901 | if ((offset + size) > entry->size) { | |
6c132d1b | 902 | err_printk(dev, entry, "DMA-API: device driver syncs" |
2d62ece1 JR |
903 | " DMA memory outside allocated range " |
904 | "[device address=0x%016llx] " | |
905 | "[allocation size=%llu bytes] [sync offset=%llu] " | |
906 | "[sync size=%llu]\n", entry->dev_addr, entry->size, | |
907 | offset, size); | |
908 | } | |
909 | ||
910 | if (direction != entry->direction) { | |
6c132d1b | 911 | err_printk(dev, entry, "DMA-API: device driver syncs " |
2d62ece1 JR |
912 | "DMA memory with different direction " |
913 | "[device address=0x%016llx] [size=%llu bytes] " | |
914 | "[mapped with %s] [synced with %s]\n", | |
93c36ed8 | 915 | (unsigned long long)addr, entry->size, |
2d62ece1 JR |
916 | dir2name[entry->direction], |
917 | dir2name[direction]); | |
918 | } | |
919 | ||
920 | if (entry->direction == DMA_BIDIRECTIONAL) | |
921 | goto out; | |
922 | ||
923 | if (to_cpu && !(entry->direction == DMA_FROM_DEVICE) && | |
924 | !(direction == DMA_TO_DEVICE)) | |
6c132d1b | 925 | err_printk(dev, entry, "DMA-API: device driver syncs " |
2d62ece1 JR |
926 | "device read-only DMA memory for cpu " |
927 | "[device address=0x%016llx] [size=%llu bytes] " | |
928 | "[mapped with %s] [synced with %s]\n", | |
93c36ed8 | 929 | (unsigned long long)addr, entry->size, |
2d62ece1 JR |
930 | dir2name[entry->direction], |
931 | dir2name[direction]); | |
932 | ||
933 | if (!to_cpu && !(entry->direction == DMA_TO_DEVICE) && | |
934 | !(direction == DMA_FROM_DEVICE)) | |
6c132d1b | 935 | err_printk(dev, entry, "DMA-API: device driver syncs " |
2d62ece1 JR |
936 | "device write-only DMA memory to device " |
937 | "[device address=0x%016llx] [size=%llu bytes] " | |
938 | "[mapped with %s] [synced with %s]\n", | |
93c36ed8 | 939 | (unsigned long long)addr, entry->size, |
2d62ece1 JR |
940 | dir2name[entry->direction], |
941 | dir2name[direction]); | |
942 | ||
943 | out: | |
944 | put_hash_bucket(bucket, &flags); | |
945 | ||
946 | } | |
947 | ||
f62bc980 JR |
948 | void debug_dma_map_page(struct device *dev, struct page *page, size_t offset, |
949 | size_t size, int direction, dma_addr_t dma_addr, | |
950 | bool map_single) | |
951 | { | |
952 | struct dma_debug_entry *entry; | |
953 | ||
954 | if (unlikely(global_disable)) | |
955 | return; | |
956 | ||
957 | if (unlikely(dma_mapping_error(dev, dma_addr))) | |
958 | return; | |
959 | ||
960 | entry = dma_entry_alloc(); | |
961 | if (!entry) | |
962 | return; | |
963 | ||
964 | entry->dev = dev; | |
965 | entry->type = dma_debug_page; | |
966 | entry->paddr = page_to_phys(page) + offset; | |
967 | entry->dev_addr = dma_addr; | |
968 | entry->size = size; | |
969 | entry->direction = direction; | |
970 | ||
9537a48e | 971 | if (map_single) |
f62bc980 | 972 | entry->type = dma_debug_single; |
9537a48e JR |
973 | |
974 | if (!PageHighMem(page)) { | |
975 | void *addr = ((char *)page_address(page)) + offset; | |
2e34bde1 JR |
976 | check_for_stack(dev, addr); |
977 | check_for_illegal_area(dev, addr, size); | |
f62bc980 JR |
978 | } |
979 | ||
980 | add_dma_entry(entry); | |
981 | } | |
982 | EXPORT_SYMBOL(debug_dma_map_page); | |
983 | ||
984 | void debug_dma_unmap_page(struct device *dev, dma_addr_t addr, | |
985 | size_t size, int direction, bool map_single) | |
986 | { | |
987 | struct dma_debug_entry ref = { | |
988 | .type = dma_debug_page, | |
989 | .dev = dev, | |
990 | .dev_addr = addr, | |
991 | .size = size, | |
992 | .direction = direction, | |
993 | }; | |
994 | ||
995 | if (unlikely(global_disable)) | |
996 | return; | |
997 | ||
998 | if (map_single) | |
999 | ref.type = dma_debug_single; | |
1000 | ||
1001 | check_unmap(&ref); | |
1002 | } | |
1003 | EXPORT_SYMBOL(debug_dma_unmap_page); | |
1004 | ||
972aa45c JR |
1005 | void debug_dma_map_sg(struct device *dev, struct scatterlist *sg, |
1006 | int nents, int mapped_ents, int direction) | |
1007 | { | |
1008 | struct dma_debug_entry *entry; | |
1009 | struct scatterlist *s; | |
1010 | int i; | |
1011 | ||
1012 | if (unlikely(global_disable)) | |
1013 | return; | |
1014 | ||
1015 | for_each_sg(sg, s, mapped_ents, i) { | |
1016 | entry = dma_entry_alloc(); | |
1017 | if (!entry) | |
1018 | return; | |
1019 | ||
1020 | entry->type = dma_debug_sg; | |
1021 | entry->dev = dev; | |
1022 | entry->paddr = sg_phys(s); | |
884d0597 | 1023 | entry->size = sg_dma_len(s); |
15aedea4 | 1024 | entry->dev_addr = sg_dma_address(s); |
972aa45c JR |
1025 | entry->direction = direction; |
1026 | entry->sg_call_ents = nents; | |
1027 | entry->sg_mapped_ents = mapped_ents; | |
1028 | ||
9537a48e JR |
1029 | if (!PageHighMem(sg_page(s))) { |
1030 | check_for_stack(dev, sg_virt(s)); | |
884d0597 | 1031 | check_for_illegal_area(dev, sg_virt(s), sg_dma_len(s)); |
9537a48e | 1032 | } |
972aa45c JR |
1033 | |
1034 | add_dma_entry(entry); | |
1035 | } | |
1036 | } | |
1037 | EXPORT_SYMBOL(debug_dma_map_sg); | |
1038 | ||
88f3907f FT |
1039 | static int get_nr_mapped_entries(struct device *dev, struct scatterlist *s) |
1040 | { | |
c17e2cf7 | 1041 | struct dma_debug_entry *entry, ref; |
88f3907f FT |
1042 | struct hash_bucket *bucket; |
1043 | unsigned long flags; | |
c17e2cf7 | 1044 | int mapped_ents; |
88f3907f | 1045 | |
c17e2cf7 | 1046 | ref.dev = dev; |
88f3907f | 1047 | ref.dev_addr = sg_dma_address(s); |
c17e2cf7 JR |
1048 | ref.size = sg_dma_len(s), |
1049 | ||
1050 | bucket = get_hash_bucket(&ref, &flags); | |
1051 | entry = hash_bucket_find(bucket, &ref); | |
1052 | mapped_ents = 0; | |
88f3907f | 1053 | |
88f3907f FT |
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]) | |
e7ed70ee JR |
1240 | pr_info("DMA-API: enable driver filter for driver [%s]\n", |
1241 | current_driver_name); | |
1745de5e JR |
1242 | |
1243 | ||
1244 | return 1; | |
1245 | } | |
1246 | __setup("dma_debug_driver=", dma_debug_driver_setup); |