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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> |
2d62ece1 | 26 | #include <linux/device.h> |
f2f45e5f | 27 | #include <linux/types.h> |
2d62ece1 | 28 | #include <linux/sched.h> |
f2f45e5f | 29 | #include <linux/list.h> |
6bf07871 | 30 | #include <linux/slab.h> |
f2f45e5f | 31 | |
2e34bde1 JR |
32 | #include <asm/sections.h> |
33 | ||
30dfa90c JR |
34 | #define HASH_SIZE 1024ULL |
35 | #define HASH_FN_SHIFT 13 | |
36 | #define HASH_FN_MASK (HASH_SIZE - 1) | |
37 | ||
f2f45e5f JR |
38 | enum { |
39 | dma_debug_single, | |
40 | dma_debug_page, | |
41 | dma_debug_sg, | |
42 | dma_debug_coherent, | |
43 | }; | |
44 | ||
6c132d1b DW |
45 | #define DMA_DEBUG_STACKTRACE_ENTRIES 5 |
46 | ||
f2f45e5f JR |
47 | struct dma_debug_entry { |
48 | struct list_head list; | |
49 | struct device *dev; | |
50 | int type; | |
51 | phys_addr_t paddr; | |
52 | u64 dev_addr; | |
53 | u64 size; | |
54 | int direction; | |
55 | int sg_call_ents; | |
56 | int sg_mapped_ents; | |
6c132d1b DW |
57 | #ifdef CONFIG_STACKTRACE |
58 | struct stack_trace stacktrace; | |
59 | unsigned long st_entries[DMA_DEBUG_STACKTRACE_ENTRIES]; | |
60 | #endif | |
f2f45e5f JR |
61 | }; |
62 | ||
30dfa90c JR |
63 | struct hash_bucket { |
64 | struct list_head list; | |
65 | spinlock_t lock; | |
2d62ece1 | 66 | } ____cacheline_aligned_in_smp; |
30dfa90c JR |
67 | |
68 | /* Hash list to save the allocated dma addresses */ | |
69 | static struct hash_bucket dma_entry_hash[HASH_SIZE]; | |
3b1e79ed JR |
70 | /* List of pre-allocated dma_debug_entry's */ |
71 | static LIST_HEAD(free_entries); | |
72 | /* Lock for the list above */ | |
73 | static DEFINE_SPINLOCK(free_entries_lock); | |
74 | ||
75 | /* Global disable flag - will be set in case of an error */ | |
76 | static bool global_disable __read_mostly; | |
77 | ||
788dcfa6 JR |
78 | /* Global error count */ |
79 | static u32 error_count; | |
80 | ||
81 | /* Global error show enable*/ | |
82 | static u32 show_all_errors __read_mostly; | |
83 | /* Number of errors to show */ | |
84 | static u32 show_num_errors = 1; | |
85 | ||
3b1e79ed JR |
86 | static u32 num_free_entries; |
87 | static u32 min_free_entries; | |
30dfa90c | 88 | |
59d3daaf JR |
89 | /* number of preallocated entries requested by kernel cmdline */ |
90 | static u32 req_entries; | |
91 | ||
788dcfa6 JR |
92 | /* debugfs dentry's for the stuff above */ |
93 | static struct dentry *dma_debug_dent __read_mostly; | |
94 | static struct dentry *global_disable_dent __read_mostly; | |
95 | static struct dentry *error_count_dent __read_mostly; | |
96 | static struct dentry *show_all_errors_dent __read_mostly; | |
97 | static struct dentry *show_num_errors_dent __read_mostly; | |
98 | static struct dentry *num_free_entries_dent __read_mostly; | |
99 | static struct dentry *min_free_entries_dent __read_mostly; | |
100 | ||
2d62ece1 JR |
101 | static const char *type2name[4] = { "single", "page", |
102 | "scather-gather", "coherent" }; | |
103 | ||
104 | static const char *dir2name[4] = { "DMA_BIDIRECTIONAL", "DMA_TO_DEVICE", | |
105 | "DMA_FROM_DEVICE", "DMA_NONE" }; | |
106 | ||
107 | /* | |
108 | * The access to some variables in this macro is racy. We can't use atomic_t | |
109 | * here because all these variables are exported to debugfs. Some of them even | |
110 | * writeable. This is also the reason why a lock won't help much. But anyway, | |
111 | * the races are no big deal. Here is why: | |
112 | * | |
113 | * error_count: the addition is racy, but the worst thing that can happen is | |
114 | * that we don't count some errors | |
115 | * show_num_errors: the subtraction is racy. Also no big deal because in | |
116 | * worst case this will result in one warning more in the | |
117 | * system log than the user configured. This variable is | |
118 | * writeable via debugfs. | |
119 | */ | |
6c132d1b DW |
120 | static inline void dump_entry_trace(struct dma_debug_entry *entry) |
121 | { | |
122 | #ifdef CONFIG_STACKTRACE | |
123 | if (entry) { | |
124 | printk(KERN_WARNING "Mapped at:\n"); | |
125 | print_stack_trace(&entry->stacktrace, 0); | |
126 | } | |
127 | #endif | |
128 | } | |
129 | ||
130 | #define err_printk(dev, entry, format, arg...) do { \ | |
2d62ece1 JR |
131 | error_count += 1; \ |
132 | if (show_all_errors || show_num_errors > 0) { \ | |
133 | WARN(1, "%s %s: " format, \ | |
134 | dev_driver_string(dev), \ | |
135 | dev_name(dev) , ## arg); \ | |
6c132d1b | 136 | dump_entry_trace(entry); \ |
2d62ece1 JR |
137 | } \ |
138 | if (!show_all_errors && show_num_errors > 0) \ | |
139 | show_num_errors -= 1; \ | |
140 | } while (0); | |
141 | ||
30dfa90c JR |
142 | /* |
143 | * Hash related functions | |
144 | * | |
145 | * Every DMA-API request is saved into a struct dma_debug_entry. To | |
146 | * have quick access to these structs they are stored into a hash. | |
147 | */ | |
148 | static int hash_fn(struct dma_debug_entry *entry) | |
149 | { | |
150 | /* | |
151 | * Hash function is based on the dma address. | |
152 | * We use bits 20-27 here as the index into the hash | |
153 | */ | |
154 | return (entry->dev_addr >> HASH_FN_SHIFT) & HASH_FN_MASK; | |
155 | } | |
156 | ||
157 | /* | |
158 | * Request exclusive access to a hash bucket for a given dma_debug_entry. | |
159 | */ | |
160 | static struct hash_bucket *get_hash_bucket(struct dma_debug_entry *entry, | |
161 | unsigned long *flags) | |
162 | { | |
163 | int idx = hash_fn(entry); | |
164 | unsigned long __flags; | |
165 | ||
166 | spin_lock_irqsave(&dma_entry_hash[idx].lock, __flags); | |
167 | *flags = __flags; | |
168 | return &dma_entry_hash[idx]; | |
169 | } | |
170 | ||
171 | /* | |
172 | * Give up exclusive access to the hash bucket | |
173 | */ | |
174 | static void put_hash_bucket(struct hash_bucket *bucket, | |
175 | unsigned long *flags) | |
176 | { | |
177 | unsigned long __flags = *flags; | |
178 | ||
179 | spin_unlock_irqrestore(&bucket->lock, __flags); | |
180 | } | |
181 | ||
182 | /* | |
183 | * Search a given entry in the hash bucket list | |
184 | */ | |
185 | static struct dma_debug_entry *hash_bucket_find(struct hash_bucket *bucket, | |
186 | struct dma_debug_entry *ref) | |
187 | { | |
188 | struct dma_debug_entry *entry; | |
189 | ||
190 | list_for_each_entry(entry, &bucket->list, list) { | |
191 | if ((entry->dev_addr == ref->dev_addr) && | |
192 | (entry->dev == ref->dev)) | |
193 | return entry; | |
194 | } | |
195 | ||
196 | return NULL; | |
197 | } | |
198 | ||
199 | /* | |
200 | * Add an entry to a hash bucket | |
201 | */ | |
202 | static void hash_bucket_add(struct hash_bucket *bucket, | |
203 | struct dma_debug_entry *entry) | |
204 | { | |
205 | list_add_tail(&entry->list, &bucket->list); | |
206 | } | |
207 | ||
208 | /* | |
209 | * Remove entry from a hash bucket list | |
210 | */ | |
211 | static void hash_bucket_del(struct dma_debug_entry *entry) | |
212 | { | |
213 | list_del(&entry->list); | |
214 | } | |
215 | ||
ac26c18b DW |
216 | /* |
217 | * Dump mapping entries for debugging purposes | |
218 | */ | |
219 | void debug_dma_dump_mappings(struct device *dev) | |
220 | { | |
221 | int idx; | |
222 | ||
223 | for (idx = 0; idx < HASH_SIZE; idx++) { | |
224 | struct hash_bucket *bucket = &dma_entry_hash[idx]; | |
225 | struct dma_debug_entry *entry; | |
226 | unsigned long flags; | |
227 | ||
228 | spin_lock_irqsave(&bucket->lock, flags); | |
229 | ||
230 | list_for_each_entry(entry, &bucket->list, list) { | |
231 | if (!dev || dev == entry->dev) { | |
232 | dev_info(entry->dev, | |
233 | "%s idx %d P=%Lx D=%Lx L=%Lx %s\n", | |
234 | type2name[entry->type], idx, | |
235 | (unsigned long long)entry->paddr, | |
236 | entry->dev_addr, entry->size, | |
237 | dir2name[entry->direction]); | |
238 | } | |
239 | } | |
240 | ||
241 | spin_unlock_irqrestore(&bucket->lock, flags); | |
242 | } | |
243 | } | |
244 | EXPORT_SYMBOL(debug_dma_dump_mappings); | |
245 | ||
30dfa90c JR |
246 | /* |
247 | * Wrapper function for adding an entry to the hash. | |
248 | * This function takes care of locking itself. | |
249 | */ | |
250 | static void add_dma_entry(struct dma_debug_entry *entry) | |
251 | { | |
252 | struct hash_bucket *bucket; | |
253 | unsigned long flags; | |
254 | ||
255 | bucket = get_hash_bucket(entry, &flags); | |
256 | hash_bucket_add(bucket, entry); | |
257 | put_hash_bucket(bucket, &flags); | |
258 | } | |
259 | ||
3b1e79ed JR |
260 | /* struct dma_entry allocator |
261 | * | |
262 | * The next two functions implement the allocator for | |
263 | * struct dma_debug_entries. | |
264 | */ | |
265 | static struct dma_debug_entry *dma_entry_alloc(void) | |
266 | { | |
267 | struct dma_debug_entry *entry = NULL; | |
268 | unsigned long flags; | |
269 | ||
270 | spin_lock_irqsave(&free_entries_lock, flags); | |
271 | ||
272 | if (list_empty(&free_entries)) { | |
273 | printk(KERN_ERR "DMA-API: debugging out of memory " | |
274 | "- disabling\n"); | |
275 | global_disable = true; | |
276 | goto out; | |
277 | } | |
278 | ||
279 | entry = list_entry(free_entries.next, struct dma_debug_entry, list); | |
280 | list_del(&entry->list); | |
281 | memset(entry, 0, sizeof(*entry)); | |
282 | ||
6c132d1b DW |
283 | #ifdef CONFIG_STACKTRACE |
284 | entry->stacktrace.max_entries = DMA_DEBUG_STACKTRACE_ENTRIES; | |
285 | entry->stacktrace.entries = entry->st_entries; | |
286 | entry->stacktrace.skip = 2; | |
287 | save_stack_trace(&entry->stacktrace); | |
288 | #endif | |
3b1e79ed JR |
289 | num_free_entries -= 1; |
290 | if (num_free_entries < min_free_entries) | |
291 | min_free_entries = num_free_entries; | |
292 | ||
293 | out: | |
294 | spin_unlock_irqrestore(&free_entries_lock, flags); | |
295 | ||
296 | return entry; | |
297 | } | |
298 | ||
299 | static void dma_entry_free(struct dma_debug_entry *entry) | |
300 | { | |
301 | unsigned long flags; | |
302 | ||
303 | /* | |
304 | * add to beginning of the list - this way the entries are | |
305 | * more likely cache hot when they are reallocated. | |
306 | */ | |
307 | spin_lock_irqsave(&free_entries_lock, flags); | |
308 | list_add(&entry->list, &free_entries); | |
309 | num_free_entries += 1; | |
310 | spin_unlock_irqrestore(&free_entries_lock, flags); | |
311 | } | |
312 | ||
6bf07871 JR |
313 | /* |
314 | * DMA-API debugging init code | |
315 | * | |
316 | * The init code does two things: | |
317 | * 1. Initialize core data structures | |
318 | * 2. Preallocate a given number of dma_debug_entry structs | |
319 | */ | |
320 | ||
321 | static int prealloc_memory(u32 num_entries) | |
322 | { | |
323 | struct dma_debug_entry *entry, *next_entry; | |
324 | int i; | |
325 | ||
326 | for (i = 0; i < num_entries; ++i) { | |
327 | entry = kzalloc(sizeof(*entry), GFP_KERNEL); | |
328 | if (!entry) | |
329 | goto out_err; | |
330 | ||
331 | list_add_tail(&entry->list, &free_entries); | |
332 | } | |
333 | ||
334 | num_free_entries = num_entries; | |
335 | min_free_entries = num_entries; | |
336 | ||
337 | printk(KERN_INFO "DMA-API: preallocated %d debug entries\n", | |
338 | num_entries); | |
339 | ||
340 | return 0; | |
341 | ||
342 | out_err: | |
343 | ||
344 | list_for_each_entry_safe(entry, next_entry, &free_entries, list) { | |
345 | list_del(&entry->list); | |
346 | kfree(entry); | |
347 | } | |
348 | ||
349 | return -ENOMEM; | |
350 | } | |
351 | ||
788dcfa6 JR |
352 | static int dma_debug_fs_init(void) |
353 | { | |
354 | dma_debug_dent = debugfs_create_dir("dma-api", NULL); | |
355 | if (!dma_debug_dent) { | |
356 | printk(KERN_ERR "DMA-API: can not create debugfs directory\n"); | |
357 | return -ENOMEM; | |
358 | } | |
359 | ||
360 | global_disable_dent = debugfs_create_bool("disabled", 0444, | |
361 | dma_debug_dent, | |
362 | (u32 *)&global_disable); | |
363 | if (!global_disable_dent) | |
364 | goto out_err; | |
365 | ||
366 | error_count_dent = debugfs_create_u32("error_count", 0444, | |
367 | dma_debug_dent, &error_count); | |
368 | if (!error_count_dent) | |
369 | goto out_err; | |
370 | ||
371 | show_all_errors_dent = debugfs_create_u32("all_errors", 0644, | |
372 | dma_debug_dent, | |
373 | &show_all_errors); | |
374 | if (!show_all_errors_dent) | |
375 | goto out_err; | |
376 | ||
377 | show_num_errors_dent = debugfs_create_u32("num_errors", 0644, | |
378 | dma_debug_dent, | |
379 | &show_num_errors); | |
380 | if (!show_num_errors_dent) | |
381 | goto out_err; | |
382 | ||
383 | num_free_entries_dent = debugfs_create_u32("num_free_entries", 0444, | |
384 | dma_debug_dent, | |
385 | &num_free_entries); | |
386 | if (!num_free_entries_dent) | |
387 | goto out_err; | |
388 | ||
389 | min_free_entries_dent = debugfs_create_u32("min_free_entries", 0444, | |
390 | dma_debug_dent, | |
391 | &min_free_entries); | |
392 | if (!min_free_entries_dent) | |
393 | goto out_err; | |
394 | ||
395 | return 0; | |
396 | ||
397 | out_err: | |
398 | debugfs_remove_recursive(dma_debug_dent); | |
399 | ||
400 | return -ENOMEM; | |
401 | } | |
402 | ||
403 | ||
6bf07871 JR |
404 | /* |
405 | * Let the architectures decide how many entries should be preallocated. | |
406 | */ | |
407 | void dma_debug_init(u32 num_entries) | |
408 | { | |
409 | int i; | |
410 | ||
411 | if (global_disable) | |
412 | return; | |
413 | ||
414 | for (i = 0; i < HASH_SIZE; ++i) { | |
415 | INIT_LIST_HEAD(&dma_entry_hash[i].list); | |
416 | dma_entry_hash[i].lock = SPIN_LOCK_UNLOCKED; | |
417 | } | |
418 | ||
788dcfa6 JR |
419 | if (dma_debug_fs_init() != 0) { |
420 | printk(KERN_ERR "DMA-API: error creating debugfs entries " | |
421 | "- disabling\n"); | |
422 | global_disable = true; | |
423 | ||
424 | return; | |
425 | } | |
426 | ||
59d3daaf JR |
427 | if (req_entries) |
428 | num_entries = req_entries; | |
429 | ||
6bf07871 JR |
430 | if (prealloc_memory(num_entries) != 0) { |
431 | printk(KERN_ERR "DMA-API: debugging out of memory error " | |
432 | "- disabled\n"); | |
433 | global_disable = true; | |
434 | ||
435 | return; | |
436 | } | |
437 | ||
438 | printk(KERN_INFO "DMA-API: debugging enabled by kernel config\n"); | |
439 | } | |
440 | ||
59d3daaf JR |
441 | static __init int dma_debug_cmdline(char *str) |
442 | { | |
443 | if (!str) | |
444 | return -EINVAL; | |
445 | ||
446 | if (strncmp(str, "off", 3) == 0) { | |
447 | printk(KERN_INFO "DMA-API: debugging disabled on kernel " | |
448 | "command line\n"); | |
449 | global_disable = true; | |
450 | } | |
451 | ||
452 | return 0; | |
453 | } | |
454 | ||
455 | static __init int dma_debug_entries_cmdline(char *str) | |
456 | { | |
457 | int res; | |
458 | ||
459 | if (!str) | |
460 | return -EINVAL; | |
461 | ||
462 | res = get_option(&str, &req_entries); | |
463 | ||
464 | if (!res) | |
465 | req_entries = 0; | |
466 | ||
467 | return 0; | |
468 | } | |
469 | ||
470 | __setup("dma_debug=", dma_debug_cmdline); | |
471 | __setup("dma_debug_entries=", dma_debug_entries_cmdline); | |
472 | ||
2d62ece1 JR |
473 | static void check_unmap(struct dma_debug_entry *ref) |
474 | { | |
475 | struct dma_debug_entry *entry; | |
476 | struct hash_bucket *bucket; | |
477 | unsigned long flags; | |
478 | ||
479 | if (dma_mapping_error(ref->dev, ref->dev_addr)) | |
480 | return; | |
481 | ||
482 | bucket = get_hash_bucket(ref, &flags); | |
483 | entry = hash_bucket_find(bucket, ref); | |
484 | ||
485 | if (!entry) { | |
6c132d1b | 486 | err_printk(ref->dev, NULL, "DMA-API: device driver tries " |
2d62ece1 JR |
487 | "to free DMA memory it has not allocated " |
488 | "[device address=0x%016llx] [size=%llu bytes]\n", | |
489 | ref->dev_addr, ref->size); | |
490 | goto out; | |
491 | } | |
492 | ||
493 | if (ref->size != entry->size) { | |
6c132d1b | 494 | err_printk(ref->dev, entry, "DMA-API: device driver frees " |
2d62ece1 JR |
495 | "DMA memory with different size " |
496 | "[device address=0x%016llx] [map size=%llu bytes] " | |
497 | "[unmap size=%llu bytes]\n", | |
498 | ref->dev_addr, entry->size, ref->size); | |
499 | } | |
500 | ||
501 | if (ref->type != entry->type) { | |
6c132d1b | 502 | err_printk(ref->dev, entry, "DMA-API: device driver frees " |
2d62ece1 JR |
503 | "DMA memory with wrong function " |
504 | "[device address=0x%016llx] [size=%llu bytes] " | |
505 | "[mapped as %s] [unmapped as %s]\n", | |
506 | ref->dev_addr, ref->size, | |
507 | type2name[entry->type], type2name[ref->type]); | |
508 | } else if ((entry->type == dma_debug_coherent) && | |
509 | (ref->paddr != entry->paddr)) { | |
6c132d1b | 510 | err_printk(ref->dev, entry, "DMA-API: device driver frees " |
2d62ece1 JR |
511 | "DMA memory with different CPU address " |
512 | "[device address=0x%016llx] [size=%llu bytes] " | |
513 | "[cpu alloc address=%p] [cpu free address=%p]", | |
514 | ref->dev_addr, ref->size, | |
515 | (void *)entry->paddr, (void *)ref->paddr); | |
516 | } | |
517 | ||
518 | if (ref->sg_call_ents && ref->type == dma_debug_sg && | |
519 | ref->sg_call_ents != entry->sg_call_ents) { | |
6c132d1b | 520 | err_printk(ref->dev, entry, "DMA-API: device driver frees " |
2d62ece1 JR |
521 | "DMA sg list with different entry count " |
522 | "[map count=%d] [unmap count=%d]\n", | |
523 | entry->sg_call_ents, ref->sg_call_ents); | |
524 | } | |
525 | ||
526 | /* | |
527 | * This may be no bug in reality - but most implementations of the | |
528 | * DMA API don't handle this properly, so check for it here | |
529 | */ | |
530 | if (ref->direction != entry->direction) { | |
6c132d1b | 531 | err_printk(ref->dev, entry, "DMA-API: device driver frees " |
2d62ece1 JR |
532 | "DMA memory with different direction " |
533 | "[device address=0x%016llx] [size=%llu bytes] " | |
534 | "[mapped with %s] [unmapped with %s]\n", | |
535 | ref->dev_addr, ref->size, | |
536 | dir2name[entry->direction], | |
537 | dir2name[ref->direction]); | |
538 | } | |
539 | ||
540 | hash_bucket_del(entry); | |
541 | dma_entry_free(entry); | |
542 | ||
543 | out: | |
544 | put_hash_bucket(bucket, &flags); | |
545 | } | |
546 | ||
547 | static void check_for_stack(struct device *dev, void *addr) | |
548 | { | |
549 | if (object_is_on_stack(addr)) | |
6c132d1b DW |
550 | err_printk(dev, NULL, "DMA-API: device driver maps memory from" |
551 | "stack [addr=%p]\n", addr); | |
2d62ece1 JR |
552 | } |
553 | ||
2e34bde1 JR |
554 | static inline bool overlap(void *addr, u64 size, void *start, void *end) |
555 | { | |
556 | void *addr2 = (char *)addr + size; | |
557 | ||
558 | return ((addr >= start && addr < end) || | |
559 | (addr2 >= start && addr2 < end) || | |
560 | ((addr < start) && (addr2 >= end))); | |
561 | } | |
562 | ||
563 | static void check_for_illegal_area(struct device *dev, void *addr, u64 size) | |
564 | { | |
565 | if (overlap(addr, size, _text, _etext) || | |
566 | overlap(addr, size, __start_rodata, __end_rodata)) | |
567 | err_printk(dev, NULL, "DMA-API: device driver maps " | |
568 | "memory from kernel text or rodata " | |
569 | "[addr=%p] [size=%llu]\n", addr, size); | |
570 | } | |
571 | ||
2d62ece1 JR |
572 | static void check_sync(struct device *dev, dma_addr_t addr, |
573 | u64 size, u64 offset, int direction, bool to_cpu) | |
574 | { | |
575 | struct dma_debug_entry ref = { | |
576 | .dev = dev, | |
577 | .dev_addr = addr, | |
578 | .size = size, | |
579 | .direction = direction, | |
580 | }; | |
581 | struct dma_debug_entry *entry; | |
582 | struct hash_bucket *bucket; | |
583 | unsigned long flags; | |
584 | ||
585 | bucket = get_hash_bucket(&ref, &flags); | |
586 | ||
587 | entry = hash_bucket_find(bucket, &ref); | |
588 | ||
589 | if (!entry) { | |
6c132d1b | 590 | err_printk(dev, NULL, "DMA-API: device driver tries " |
2d62ece1 JR |
591 | "to sync DMA memory it has not allocated " |
592 | "[device address=0x%016llx] [size=%llu bytes]\n", | |
593 | addr, size); | |
594 | goto out; | |
595 | } | |
596 | ||
597 | if ((offset + size) > entry->size) { | |
6c132d1b | 598 | err_printk(dev, entry, "DMA-API: device driver syncs" |
2d62ece1 JR |
599 | " DMA memory outside allocated range " |
600 | "[device address=0x%016llx] " | |
601 | "[allocation size=%llu bytes] [sync offset=%llu] " | |
602 | "[sync size=%llu]\n", entry->dev_addr, entry->size, | |
603 | offset, size); | |
604 | } | |
605 | ||
606 | if (direction != entry->direction) { | |
6c132d1b | 607 | err_printk(dev, entry, "DMA-API: device driver syncs " |
2d62ece1 JR |
608 | "DMA memory with different direction " |
609 | "[device address=0x%016llx] [size=%llu bytes] " | |
610 | "[mapped with %s] [synced with %s]\n", | |
611 | addr, entry->size, | |
612 | dir2name[entry->direction], | |
613 | dir2name[direction]); | |
614 | } | |
615 | ||
616 | if (entry->direction == DMA_BIDIRECTIONAL) | |
617 | goto out; | |
618 | ||
619 | if (to_cpu && !(entry->direction == DMA_FROM_DEVICE) && | |
620 | !(direction == DMA_TO_DEVICE)) | |
6c132d1b | 621 | err_printk(dev, entry, "DMA-API: device driver syncs " |
2d62ece1 JR |
622 | "device read-only DMA memory for cpu " |
623 | "[device address=0x%016llx] [size=%llu bytes] " | |
624 | "[mapped with %s] [synced with %s]\n", | |
625 | addr, entry->size, | |
626 | dir2name[entry->direction], | |
627 | dir2name[direction]); | |
628 | ||
629 | if (!to_cpu && !(entry->direction == DMA_TO_DEVICE) && | |
630 | !(direction == DMA_FROM_DEVICE)) | |
6c132d1b | 631 | err_printk(dev, entry, "DMA-API: device driver syncs " |
2d62ece1 JR |
632 | "device write-only DMA memory to device " |
633 | "[device address=0x%016llx] [size=%llu bytes] " | |
634 | "[mapped with %s] [synced with %s]\n", | |
635 | addr, entry->size, | |
636 | dir2name[entry->direction], | |
637 | dir2name[direction]); | |
638 | ||
639 | out: | |
640 | put_hash_bucket(bucket, &flags); | |
641 | ||
642 | } | |
643 | ||
f62bc980 JR |
644 | void debug_dma_map_page(struct device *dev, struct page *page, size_t offset, |
645 | size_t size, int direction, dma_addr_t dma_addr, | |
646 | bool map_single) | |
647 | { | |
648 | struct dma_debug_entry *entry; | |
649 | ||
650 | if (unlikely(global_disable)) | |
651 | return; | |
652 | ||
653 | if (unlikely(dma_mapping_error(dev, dma_addr))) | |
654 | return; | |
655 | ||
656 | entry = dma_entry_alloc(); | |
657 | if (!entry) | |
658 | return; | |
659 | ||
660 | entry->dev = dev; | |
661 | entry->type = dma_debug_page; | |
662 | entry->paddr = page_to_phys(page) + offset; | |
663 | entry->dev_addr = dma_addr; | |
664 | entry->size = size; | |
665 | entry->direction = direction; | |
666 | ||
667 | if (map_single) { | |
2e34bde1 JR |
668 | void *addr = ((char *)page_address(page)) + offset; |
669 | ||
f62bc980 | 670 | entry->type = dma_debug_single; |
2e34bde1 JR |
671 | check_for_stack(dev, addr); |
672 | check_for_illegal_area(dev, addr, size); | |
f62bc980 JR |
673 | } |
674 | ||
675 | add_dma_entry(entry); | |
676 | } | |
677 | EXPORT_SYMBOL(debug_dma_map_page); | |
678 | ||
679 | void debug_dma_unmap_page(struct device *dev, dma_addr_t addr, | |
680 | size_t size, int direction, bool map_single) | |
681 | { | |
682 | struct dma_debug_entry ref = { | |
683 | .type = dma_debug_page, | |
684 | .dev = dev, | |
685 | .dev_addr = addr, | |
686 | .size = size, | |
687 | .direction = direction, | |
688 | }; | |
689 | ||
690 | if (unlikely(global_disable)) | |
691 | return; | |
692 | ||
693 | if (map_single) | |
694 | ref.type = dma_debug_single; | |
695 | ||
696 | check_unmap(&ref); | |
697 | } | |
698 | EXPORT_SYMBOL(debug_dma_unmap_page); | |
699 | ||
972aa45c JR |
700 | void debug_dma_map_sg(struct device *dev, struct scatterlist *sg, |
701 | int nents, int mapped_ents, int direction) | |
702 | { | |
703 | struct dma_debug_entry *entry; | |
704 | struct scatterlist *s; | |
705 | int i; | |
706 | ||
707 | if (unlikely(global_disable)) | |
708 | return; | |
709 | ||
710 | for_each_sg(sg, s, mapped_ents, i) { | |
711 | entry = dma_entry_alloc(); | |
712 | if (!entry) | |
713 | return; | |
714 | ||
715 | entry->type = dma_debug_sg; | |
716 | entry->dev = dev; | |
717 | entry->paddr = sg_phys(s); | |
718 | entry->size = s->length; | |
719 | entry->dev_addr = s->dma_address; | |
720 | entry->direction = direction; | |
721 | entry->sg_call_ents = nents; | |
722 | entry->sg_mapped_ents = mapped_ents; | |
723 | ||
724 | check_for_stack(dev, sg_virt(s)); | |
2e34bde1 | 725 | check_for_illegal_area(dev, sg_virt(s), s->length); |
972aa45c JR |
726 | |
727 | add_dma_entry(entry); | |
728 | } | |
729 | } | |
730 | EXPORT_SYMBOL(debug_dma_map_sg); | |
731 | ||
732 | void debug_dma_unmap_sg(struct device *dev, struct scatterlist *sglist, | |
733 | int nelems, int dir) | |
734 | { | |
735 | struct dma_debug_entry *entry; | |
736 | struct scatterlist *s; | |
737 | int mapped_ents = 0, i; | |
738 | unsigned long flags; | |
739 | ||
740 | if (unlikely(global_disable)) | |
741 | return; | |
742 | ||
743 | for_each_sg(sglist, s, nelems, i) { | |
744 | ||
745 | struct dma_debug_entry ref = { | |
746 | .type = dma_debug_sg, | |
747 | .dev = dev, | |
748 | .paddr = sg_phys(s), | |
749 | .dev_addr = s->dma_address, | |
750 | .size = s->length, | |
751 | .direction = dir, | |
752 | .sg_call_ents = 0, | |
753 | }; | |
754 | ||
755 | if (mapped_ents && i >= mapped_ents) | |
756 | break; | |
757 | ||
758 | if (mapped_ents == 0) { | |
759 | struct hash_bucket *bucket; | |
760 | ref.sg_call_ents = nelems; | |
761 | bucket = get_hash_bucket(&ref, &flags); | |
762 | entry = hash_bucket_find(bucket, &ref); | |
763 | if (entry) | |
764 | mapped_ents = entry->sg_mapped_ents; | |
765 | put_hash_bucket(bucket, &flags); | |
766 | } | |
767 | ||
768 | check_unmap(&ref); | |
769 | } | |
770 | } | |
771 | EXPORT_SYMBOL(debug_dma_unmap_sg); | |
772 | ||
6bfd4498 JR |
773 | void debug_dma_alloc_coherent(struct device *dev, size_t size, |
774 | dma_addr_t dma_addr, void *virt) | |
775 | { | |
776 | struct dma_debug_entry *entry; | |
777 | ||
778 | if (unlikely(global_disable)) | |
779 | return; | |
780 | ||
781 | if (unlikely(virt == NULL)) | |
782 | return; | |
783 | ||
784 | entry = dma_entry_alloc(); | |
785 | if (!entry) | |
786 | return; | |
787 | ||
788 | entry->type = dma_debug_coherent; | |
789 | entry->dev = dev; | |
790 | entry->paddr = virt_to_phys(virt); | |
791 | entry->size = size; | |
792 | entry->dev_addr = dma_addr; | |
793 | entry->direction = DMA_BIDIRECTIONAL; | |
794 | ||
795 | add_dma_entry(entry); | |
796 | } | |
797 | EXPORT_SYMBOL(debug_dma_alloc_coherent); | |
798 | ||
799 | void debug_dma_free_coherent(struct device *dev, size_t size, | |
800 | void *virt, dma_addr_t addr) | |
801 | { | |
802 | struct dma_debug_entry ref = { | |
803 | .type = dma_debug_coherent, | |
804 | .dev = dev, | |
805 | .paddr = virt_to_phys(virt), | |
806 | .dev_addr = addr, | |
807 | .size = size, | |
808 | .direction = DMA_BIDIRECTIONAL, | |
809 | }; | |
810 | ||
811 | if (unlikely(global_disable)) | |
812 | return; | |
813 | ||
814 | check_unmap(&ref); | |
815 | } | |
816 | EXPORT_SYMBOL(debug_dma_free_coherent); | |
817 | ||
b9d2317e JR |
818 | void debug_dma_sync_single_for_cpu(struct device *dev, dma_addr_t dma_handle, |
819 | size_t size, int direction) | |
820 | { | |
821 | if (unlikely(global_disable)) | |
822 | return; | |
823 | ||
824 | check_sync(dev, dma_handle, size, 0, direction, true); | |
825 | } | |
826 | EXPORT_SYMBOL(debug_dma_sync_single_for_cpu); | |
827 | ||
828 | void debug_dma_sync_single_for_device(struct device *dev, | |
829 | dma_addr_t dma_handle, size_t size, | |
830 | int direction) | |
831 | { | |
832 | if (unlikely(global_disable)) | |
833 | return; | |
834 | ||
835 | check_sync(dev, dma_handle, size, 0, direction, false); | |
836 | } | |
837 | EXPORT_SYMBOL(debug_dma_sync_single_for_device); | |
838 | ||
948408ba JR |
839 | void debug_dma_sync_single_range_for_cpu(struct device *dev, |
840 | dma_addr_t dma_handle, | |
841 | unsigned long offset, size_t size, | |
842 | int direction) | |
843 | { | |
844 | if (unlikely(global_disable)) | |
845 | return; | |
846 | ||
847 | check_sync(dev, dma_handle, size, offset, direction, true); | |
848 | } | |
849 | EXPORT_SYMBOL(debug_dma_sync_single_range_for_cpu); | |
850 | ||
851 | void debug_dma_sync_single_range_for_device(struct device *dev, | |
852 | dma_addr_t dma_handle, | |
853 | unsigned long offset, | |
854 | size_t size, int direction) | |
855 | { | |
856 | if (unlikely(global_disable)) | |
857 | return; | |
858 | ||
859 | check_sync(dev, dma_handle, size, offset, direction, false); | |
860 | } | |
861 | EXPORT_SYMBOL(debug_dma_sync_single_range_for_device); | |
862 | ||
a31fba5d JR |
863 | void debug_dma_sync_sg_for_cpu(struct device *dev, struct scatterlist *sg, |
864 | int nelems, int direction) | |
865 | { | |
866 | struct scatterlist *s; | |
867 | int i; | |
868 | ||
869 | if (unlikely(global_disable)) | |
870 | return; | |
871 | ||
872 | for_each_sg(sg, s, nelems, i) { | |
873 | check_sync(dev, s->dma_address, s->dma_length, 0, | |
874 | direction, true); | |
875 | } | |
876 | } | |
877 | EXPORT_SYMBOL(debug_dma_sync_sg_for_cpu); | |
878 | ||
879 | void debug_dma_sync_sg_for_device(struct device *dev, struct scatterlist *sg, | |
880 | int nelems, int direction) | |
881 | { | |
882 | struct scatterlist *s; | |
883 | int i; | |
884 | ||
885 | if (unlikely(global_disable)) | |
886 | return; | |
887 | ||
888 | for_each_sg(sg, s, nelems, i) { | |
889 | check_sync(dev, s->dma_address, s->dma_length, 0, | |
890 | direction, false); | |
891 | } | |
892 | } | |
893 | EXPORT_SYMBOL(debug_dma_sync_sg_for_device); | |
894 |