Blame view
lib/dma-debug.c
41.9 KB
f2f45e5f3 dma-debug: add he... |
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 |
/* * Copyright (C) 2008 Advanced Micro Devices, Inc. * * Author: Joerg Roedel <joerg.roedel@amd.com> * * This program is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License version 2 as published * by the Free Software Foundation. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */ |
972aa45ce dma-debug: add ad... |
19 |
#include <linux/scatterlist.h> |
2d62ece14 dma-debug: add co... |
20 |
#include <linux/dma-mapping.h> |
6c132d1bc dma-debug: print ... |
21 |
#include <linux/stacktrace.h> |
f2f45e5f3 dma-debug: add he... |
22 |
#include <linux/dma-debug.h> |
30dfa90cc dma-debug: add ha... |
23 |
#include <linux/spinlock.h> |
788dcfa6f dma-debug: add de... |
24 |
#include <linux/debugfs.h> |
8a6fc708b dma-debug: add de... |
25 |
#include <linux/uaccess.h> |
23a7bfae6 lib: dma-debug ne... |
26 |
#include <linux/export.h> |
2d62ece14 dma-debug: add co... |
27 |
#include <linux/device.h> |
f2f45e5f3 dma-debug: add he... |
28 |
#include <linux/types.h> |
2d62ece14 dma-debug: add co... |
29 |
#include <linux/sched.h> |
8a6fc708b dma-debug: add de... |
30 |
#include <linux/ctype.h> |
f2f45e5f3 dma-debug: add he... |
31 |
#include <linux/list.h> |
6bf078715 dma-debug: add in... |
32 |
#include <linux/slab.h> |
f2f45e5f3 dma-debug: add he... |
33 |
|
2e34bde18 dma-debug: add ch... |
34 |
#include <asm/sections.h> |
30dfa90cc dma-debug: add ha... |
35 36 37 |
#define HASH_SIZE 1024ULL #define HASH_FN_SHIFT 13 #define HASH_FN_MASK (HASH_SIZE - 1) |
f2f45e5f3 dma-debug: add he... |
38 39 40 41 42 43 |
enum { dma_debug_single, dma_debug_page, dma_debug_sg, dma_debug_coherent, }; |
6c9c6d630 dma-debug: New in... |
44 45 46 47 48 |
enum map_err_types { MAP_ERR_CHECK_NOT_APPLICABLE, MAP_ERR_NOT_CHECKED, MAP_ERR_CHECKED, }; |
6c132d1bc dma-debug: print ... |
49 |
#define DMA_DEBUG_STACKTRACE_ENTRIES 5 |
0abdd7a81 dma-debug: introd... |
50 51 52 53 54 55 56 57 58 59 60 61 62 63 |
/** * struct dma_debug_entry - track a dma_map* or dma_alloc_coherent mapping * @list: node on pre-allocated free_entries list * @dev: 'dev' argument to dma_map_{page|single|sg} or dma_alloc_coherent * @type: single, page, sg, coherent * @pfn: page frame of the start address * @offset: offset of mapping relative to pfn * @size: length of the mapping * @direction: enum dma_data_direction * @sg_call_ents: 'nents' from dma_map_sg * @sg_mapped_ents: 'mapped_ents' from dma_map_sg * @map_err_type: track whether dma_mapping_error() was checked * @stacktrace: support backtraces when a violation is detected */ |
f2f45e5f3 dma-debug: add he... |
64 65 66 67 |
struct dma_debug_entry { struct list_head list; struct device *dev; int type; |
0abdd7a81 dma-debug: introd... |
68 69 |
unsigned long pfn; size_t offset; |
f2f45e5f3 dma-debug: add he... |
70 71 72 73 74 |
u64 dev_addr; u64 size; int direction; int sg_call_ents; int sg_mapped_ents; |
6c9c6d630 dma-debug: New in... |
75 |
enum map_err_types map_err_type; |
6c132d1bc dma-debug: print ... |
76 77 78 79 |
#ifdef CONFIG_STACKTRACE struct stack_trace stacktrace; unsigned long st_entries[DMA_DEBUG_STACKTRACE_ENTRIES]; #endif |
f2f45e5f3 dma-debug: add he... |
80 |
}; |
c6a21d0b8 dma-debug: hash_b... |
81 |
typedef bool (*match_fn)(struct dma_debug_entry *, struct dma_debug_entry *); |
30dfa90cc dma-debug: add ha... |
82 83 84 |
struct hash_bucket { struct list_head list; spinlock_t lock; |
2d62ece14 dma-debug: add co... |
85 |
} ____cacheline_aligned_in_smp; |
30dfa90cc dma-debug: add ha... |
86 87 88 |
/* Hash list to save the allocated dma addresses */ static struct hash_bucket dma_entry_hash[HASH_SIZE]; |
3b1e79ed7 dma-debug: add al... |
89 90 91 92 93 94 |
/* List of pre-allocated dma_debug_entry's */ static LIST_HEAD(free_entries); /* Lock for the list above */ static DEFINE_SPINLOCK(free_entries_lock); /* Global disable flag - will be set in case of an error */ |
68ee6d223 dma-debug: debugf... |
95 |
static u32 global_disable __read_mostly; |
3b1e79ed7 dma-debug: add al... |
96 |
|
2ce8e7ed0 dma-debug: preven... |
97 98 |
/* Early initialization disable flag, set at the end of dma_debug_init */ static bool dma_debug_initialized __read_mostly; |
01ce18b31 dma-debug: introd... |
99 100 |
static inline bool dma_debug_disabled(void) { |
2ce8e7ed0 dma-debug: preven... |
101 |
return global_disable || !dma_debug_initialized; |
01ce18b31 dma-debug: introd... |
102 |
} |
788dcfa6f dma-debug: add de... |
103 104 105 106 107 108 109 |
/* Global error count */ static u32 error_count; /* Global error show enable*/ static u32 show_all_errors __read_mostly; /* Number of errors to show */ static u32 show_num_errors = 1; |
3b1e79ed7 dma-debug: add al... |
110 111 |
static u32 num_free_entries; static u32 min_free_entries; |
e6a1a89d5 dma-debug: add dm... |
112 |
static u32 nr_total_entries; |
30dfa90cc dma-debug: add ha... |
113 |
|
59d3daafa dma-debug: add ke... |
114 115 |
/* number of preallocated entries requested by kernel cmdline */ static u32 req_entries; |
788dcfa6f dma-debug: add de... |
116 117 118 119 120 121 122 123 |
/* debugfs dentry's for the stuff above */ static struct dentry *dma_debug_dent __read_mostly; static struct dentry *global_disable_dent __read_mostly; static struct dentry *error_count_dent __read_mostly; static struct dentry *show_all_errors_dent __read_mostly; static struct dentry *show_num_errors_dent __read_mostly; static struct dentry *num_free_entries_dent __read_mostly; static struct dentry *min_free_entries_dent __read_mostly; |
8a6fc708b dma-debug: add de... |
124 |
static struct dentry *filter_dent __read_mostly; |
788dcfa6f dma-debug: add de... |
125 |
|
2e507d849 dma-debug: add va... |
126 127 128 129 130 131 132 133 |
/* per-driver filter related state */ #define NAME_MAX_LEN 64 static char current_driver_name[NAME_MAX_LEN] __read_mostly; static struct device_driver *current_driver __read_mostly; static DEFINE_RWLOCK(driver_name_lock); |
788dcfa6f dma-debug: add de... |
134 |
|
6c9c6d630 dma-debug: New in... |
135 136 137 138 139 |
static const char *const maperr2str[] = { [MAP_ERR_CHECK_NOT_APPLICABLE] = "dma map error check not applicable", [MAP_ERR_NOT_CHECKED] = "dma map error not checked", [MAP_ERR_CHECKED] = "dma map error checked", }; |
2d62ece14 dma-debug: add co... |
140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 |
static const char *type2name[4] = { "single", "page", "scather-gather", "coherent" }; static const char *dir2name[4] = { "DMA_BIDIRECTIONAL", "DMA_TO_DEVICE", "DMA_FROM_DEVICE", "DMA_NONE" }; /* * The access to some variables in this macro is racy. We can't use atomic_t * here because all these variables are exported to debugfs. Some of them even * writeable. This is also the reason why a lock won't help much. But anyway, * the races are no big deal. Here is why: * * error_count: the addition is racy, but the worst thing that can happen is * that we don't count some errors * show_num_errors: the subtraction is racy. Also no big deal because in * worst case this will result in one warning more in the * system log than the user configured. This variable is * writeable via debugfs. */ |
6c132d1bc dma-debug: print ... |
159 160 161 162 |
static inline void dump_entry_trace(struct dma_debug_entry *entry) { #ifdef CONFIG_STACKTRACE if (entry) { |
e7ed70eed dma-debug: use pr... |
163 164 |
pr_warning("Mapped at: "); |
6c132d1bc dma-debug: print ... |
165 166 167 168 |
print_stack_trace(&entry->stacktrace, 0); } #endif } |
2e507d849 dma-debug: add va... |
169 170 |
static bool driver_filter(struct device *dev) { |
0bf841281 dma-debug: simpli... |
171 172 173 |
struct device_driver *drv; unsigned long flags; bool ret; |
2e507d849 dma-debug: add va... |
174 175 176 177 178 |
/* driver filter off */ if (likely(!current_driver_name[0])) return true; /* driver filter on and initialized */ |
ec9c96ef3 dma-debug: Fix ch... |
179 |
if (current_driver && dev && dev->driver == current_driver) |
2e507d849 dma-debug: add va... |
180 |
return true; |
ec9c96ef3 dma-debug: Fix ch... |
181 182 183 |
/* driver filter on, but we can't filter on a NULL device... */ if (!dev) return false; |
0bf841281 dma-debug: simpli... |
184 185 |
if (current_driver || !current_driver_name[0]) return false; |
2e507d849 dma-debug: add va... |
186 |
|
0bf841281 dma-debug: simpli... |
187 |
/* driver filter on but not yet initialized */ |
f3ff92470 Remove useless ge... |
188 |
drv = dev->driver; |
0bf841281 dma-debug: simpli... |
189 190 191 192 193 194 195 196 197 198 199 |
if (!drv) return false; /* lock to protect against change of current_driver_name */ read_lock_irqsave(&driver_name_lock, flags); ret = false; if (drv->name && strncmp(current_driver_name, drv->name, NAME_MAX_LEN - 1) == 0) { current_driver = drv; ret = true; |
2e507d849 dma-debug: add va... |
200 |
} |
0bf841281 dma-debug: simpli... |
201 |
read_unlock_irqrestore(&driver_name_lock, flags); |
0bf841281 dma-debug: simpli... |
202 203 |
return ret; |
2e507d849 dma-debug: add va... |
204 |
} |
ec9c96ef3 dma-debug: Fix ch... |
205 206 207 208 209 210 211 212 213 214 215 |
#define err_printk(dev, entry, format, arg...) do { \ error_count += 1; \ if (driver_filter(dev) && \ (show_all_errors || show_num_errors > 0)) { \ WARN(1, "%s %s: " format, \ dev ? dev_driver_string(dev) : "NULL", \ dev ? dev_name(dev) : "NULL", ## arg); \ dump_entry_trace(entry); \ } \ if (!show_all_errors && show_num_errors > 0) \ show_num_errors -= 1; \ |
2d62ece14 dma-debug: add co... |
216 |
} while (0); |
30dfa90cc dma-debug: add ha... |
217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 |
/* * Hash related functions * * Every DMA-API request is saved into a struct dma_debug_entry. To * have quick access to these structs they are stored into a hash. */ static int hash_fn(struct dma_debug_entry *entry) { /* * Hash function is based on the dma address. * We use bits 20-27 here as the index into the hash */ return (entry->dev_addr >> HASH_FN_SHIFT) & HASH_FN_MASK; } /* * Request exclusive access to a hash bucket for a given dma_debug_entry. */ static struct hash_bucket *get_hash_bucket(struct dma_debug_entry *entry, unsigned long *flags) { int idx = hash_fn(entry); unsigned long __flags; spin_lock_irqsave(&dma_entry_hash[idx].lock, __flags); *flags = __flags; return &dma_entry_hash[idx]; } /* * Give up exclusive access to the hash bucket */ static void put_hash_bucket(struct hash_bucket *bucket, unsigned long *flags) { unsigned long __flags = *flags; spin_unlock_irqrestore(&bucket->lock, __flags); } |
c6a21d0b8 dma-debug: hash_b... |
256 257 |
static bool exact_match(struct dma_debug_entry *a, struct dma_debug_entry *b) { |
91ec37cc1 Fix comparison us... |
258 |
return ((a->dev_addr == b->dev_addr) && |
c6a21d0b8 dma-debug: hash_b... |
259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 |
(a->dev == b->dev)) ? true : false; } static bool containing_match(struct dma_debug_entry *a, struct dma_debug_entry *b) { if (a->dev != b->dev) return false; if ((b->dev_addr <= a->dev_addr) && ((b->dev_addr + b->size) >= (a->dev_addr + a->size))) return true; return false; } |
30dfa90cc dma-debug: add ha... |
274 275 276 |
/* * Search a given entry in the hash bucket list */ |
c6a21d0b8 dma-debug: hash_b... |
277 278 279 |
static struct dma_debug_entry *__hash_bucket_find(struct hash_bucket *bucket, struct dma_debug_entry *ref, match_fn match) |
30dfa90cc dma-debug: add ha... |
280 |
{ |
7caf6a49b dma-debug: change... |
281 |
struct dma_debug_entry *entry, *ret = NULL; |
fe73fbe1c lib/dma-debug.c: ... |
282 |
int matches = 0, match_lvl, last_lvl = -1; |
30dfa90cc dma-debug: add ha... |
283 284 |
list_for_each_entry(entry, &bucket->list, list) { |
c6a21d0b8 dma-debug: hash_b... |
285 |
if (!match(ref, entry)) |
7caf6a49b dma-debug: change... |
286 287 288 289 290 291 292 |
continue; /* * Some drivers map the same physical address multiple * times. Without a hardware IOMMU this results in the * same device addresses being put into the dma-debug * hash multiple times too. This can result in false |
af901ca18 tree-wide: fix as... |
293 |
* positives being reported. Therefore we implement a |
7caf6a49b dma-debug: change... |
294 295 296 297 298 299 |
* best-fit algorithm here which returns the entry from * the hash which fits best to the reference value * instead of the first-fit. */ matches += 1; match_lvl = 0; |
e5e8c5b90 dma-debug: check ... |
300 301 302 303 |
entry->size == ref->size ? ++match_lvl : 0; entry->type == ref->type ? ++match_lvl : 0; entry->direction == ref->direction ? ++match_lvl : 0; entry->sg_call_ents == ref->sg_call_ents ? ++match_lvl : 0; |
7caf6a49b dma-debug: change... |
304 |
|
e5e8c5b90 dma-debug: check ... |
305 |
if (match_lvl == 4) { |
7caf6a49b dma-debug: change... |
306 |
/* perfect-fit - return the result */ |
30dfa90cc dma-debug: add ha... |
307 |
return entry; |
7caf6a49b dma-debug: change... |
308 309 310 |
} else if (match_lvl > last_lvl) { /* * We found an entry that fits better then the |
fe73fbe1c lib/dma-debug.c: ... |
311 |
* previous one or it is the 1st match. |
7caf6a49b dma-debug: change... |
312 313 314 315 |
*/ last_lvl = match_lvl; ret = entry; } |
30dfa90cc dma-debug: add ha... |
316 |
} |
7caf6a49b dma-debug: change... |
317 318 319 320 321 322 323 |
/* * If we have multiple matches but no perfect-fit, just return * NULL. */ ret = (matches == 1) ? ret : NULL; return ret; |
30dfa90cc dma-debug: add ha... |
324 |
} |
c6a21d0b8 dma-debug: hash_b... |
325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 |
static struct dma_debug_entry *bucket_find_exact(struct hash_bucket *bucket, struct dma_debug_entry *ref) { return __hash_bucket_find(bucket, ref, exact_match); } static struct dma_debug_entry *bucket_find_contain(struct hash_bucket **bucket, struct dma_debug_entry *ref, unsigned long *flags) { unsigned int max_range = dma_get_max_seg_size(ref->dev); struct dma_debug_entry *entry, index = *ref; unsigned int range = 0; while (range <= max_range) { |
a7a2c02a4 lib/dma-debug: fi... |
341 |
entry = __hash_bucket_find(*bucket, ref, containing_match); |
c6a21d0b8 dma-debug: hash_b... |
342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 |
if (entry) return entry; /* * Nothing found, go back a hash bucket */ put_hash_bucket(*bucket, flags); range += (1 << HASH_FN_SHIFT); index.dev_addr -= (1 << HASH_FN_SHIFT); *bucket = get_hash_bucket(&index, flags); } return NULL; } |
30dfa90cc dma-debug: add ha... |
357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 |
/* * Add an entry to a hash bucket */ static void hash_bucket_add(struct hash_bucket *bucket, struct dma_debug_entry *entry) { list_add_tail(&entry->list, &bucket->list); } /* * Remove entry from a hash bucket list */ static void hash_bucket_del(struct dma_debug_entry *entry) { list_del(&entry->list); } |
0abdd7a81 dma-debug: introd... |
373 374 375 376 |
static unsigned long long phys_addr(struct dma_debug_entry *entry) { return page_to_phys(pfn_to_page(entry->pfn)) + entry->offset; } |
30dfa90cc dma-debug: add ha... |
377 |
/* |
ac26c18bd dma-debug: add fu... |
378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 |
* Dump mapping entries for debugging purposes */ void debug_dma_dump_mappings(struct device *dev) { int idx; for (idx = 0; idx < HASH_SIZE; idx++) { struct hash_bucket *bucket = &dma_entry_hash[idx]; struct dma_debug_entry *entry; unsigned long flags; spin_lock_irqsave(&bucket->lock, flags); list_for_each_entry(entry, &bucket->list, list) { if (!dev || dev == entry->dev) { dev_info(entry->dev, |
0abdd7a81 dma-debug: introd... |
394 395 |
"%s idx %d P=%Lx N=%lx D=%Lx L=%Lx %s %s ", |
ac26c18bd dma-debug: add fu... |
396 |
type2name[entry->type], idx, |
0abdd7a81 dma-debug: introd... |
397 |
phys_addr(entry), entry->pfn, |
ac26c18bd dma-debug: add fu... |
398 |
entry->dev_addr, entry->size, |
6c9c6d630 dma-debug: New in... |
399 400 |
dir2name[entry->direction], maperr2str[entry->map_err_type]); |
ac26c18bd dma-debug: add fu... |
401 402 403 404 405 406 407 408 409 |
} } spin_unlock_irqrestore(&bucket->lock, flags); } } EXPORT_SYMBOL(debug_dma_dump_mappings); /* |
3b7a6418c dma debug: accoun... |
410 411 412 413 |
* For each mapping (initial cacheline in the case of * dma_alloc_coherent/dma_map_page, initial cacheline in each page of a * scatterlist, or the cacheline specified in dma_map_single) insert * into this tree using the cacheline as the key. At |
0abdd7a81 dma-debug: introd... |
414 |
* dma_unmap_{single|sg|page} or dma_free_coherent delete the entry. If |
3b7a6418c dma debug: accoun... |
415 |
* the entry already exists at insertion time add a tag as a reference |
0abdd7a81 dma-debug: introd... |
416 |
* count for the overlapping mappings. For now, the overlap tracking |
3b7a6418c dma debug: accoun... |
417 418 419 |
* just ensures that 'unmaps' balance 'maps' before marking the * cacheline idle, but we should also be flagging overlaps as an API * violation. |
0abdd7a81 dma-debug: introd... |
420 421 422 |
* * Memory usage is mostly constrained by the maximum number of available * dma-debug entries in that we need a free dma_debug_entry before |
3b7a6418c dma debug: accoun... |
423 424 425 426 427 |
* inserting into the tree. In the case of dma_map_page and * dma_alloc_coherent there is only one dma_debug_entry and one * dma_active_cacheline entry to track per event. dma_map_sg(), on the * other hand, consumes a single dma_debug_entry, but inserts 'nents' * entries into the tree. |
0abdd7a81 dma-debug: introd... |
428 429 |
* * At any time debug_dma_assert_idle() can be called to trigger a |
3b7a6418c dma debug: accoun... |
430 |
* warning if any cachelines in the given page are in the active set. |
0abdd7a81 dma-debug: introd... |
431 |
*/ |
3b7a6418c dma debug: accoun... |
432 |
static RADIX_TREE(dma_active_cacheline, GFP_NOWAIT); |
0abdd7a81 dma-debug: introd... |
433 |
static DEFINE_SPINLOCK(radix_lock); |
3b7a6418c dma debug: accoun... |
434 435 436 |
#define ACTIVE_CACHELINE_MAX_OVERLAP ((1 << RADIX_TREE_MAX_TAGS) - 1) #define CACHELINE_PER_PAGE_SHIFT (PAGE_SHIFT - L1_CACHE_SHIFT) #define CACHELINES_PER_PAGE (1 << CACHELINE_PER_PAGE_SHIFT) |
0abdd7a81 dma-debug: introd... |
437 |
|
3b7a6418c dma debug: accoun... |
438 439 440 441 442 443 444 |
static phys_addr_t to_cacheline_number(struct dma_debug_entry *entry) { return (entry->pfn << CACHELINE_PER_PAGE_SHIFT) + (entry->offset >> L1_CACHE_SHIFT); } static int active_cacheline_read_overlap(phys_addr_t cln) |
0abdd7a81 dma-debug: introd... |
445 446 447 448 |
{ int overlap = 0, i; for (i = RADIX_TREE_MAX_TAGS - 1; i >= 0; i--) |
3b7a6418c dma debug: accoun... |
449 |
if (radix_tree_tag_get(&dma_active_cacheline, cln, i)) |
0abdd7a81 dma-debug: introd... |
450 451 452 |
overlap |= 1 << i; return overlap; } |
3b7a6418c dma debug: accoun... |
453 |
static int active_cacheline_set_overlap(phys_addr_t cln, int overlap) |
0abdd7a81 dma-debug: introd... |
454 455 |
{ int i; |
3b7a6418c dma debug: accoun... |
456 |
if (overlap > ACTIVE_CACHELINE_MAX_OVERLAP || overlap < 0) |
59f2e7df5 dma-debug: fix ov... |
457 |
return overlap; |
0abdd7a81 dma-debug: introd... |
458 459 460 |
for (i = RADIX_TREE_MAX_TAGS - 1; i >= 0; i--) if (overlap & 1 << i) |
3b7a6418c dma debug: accoun... |
461 |
radix_tree_tag_set(&dma_active_cacheline, cln, i); |
0abdd7a81 dma-debug: introd... |
462 |
else |
3b7a6418c dma debug: accoun... |
463 |
radix_tree_tag_clear(&dma_active_cacheline, cln, i); |
0abdd7a81 dma-debug: introd... |
464 465 466 |
return overlap; } |
3b7a6418c dma debug: accoun... |
467 |
static void active_cacheline_inc_overlap(phys_addr_t cln) |
0abdd7a81 dma-debug: introd... |
468 |
{ |
3b7a6418c dma debug: accoun... |
469 |
int overlap = active_cacheline_read_overlap(cln); |
0abdd7a81 dma-debug: introd... |
470 |
|
3b7a6418c dma debug: accoun... |
471 |
overlap = active_cacheline_set_overlap(cln, ++overlap); |
0abdd7a81 dma-debug: introd... |
472 473 474 475 |
/* If we overflowed the overlap counter then we're potentially * leaking dma-mappings. Otherwise, if maps and unmaps are * balanced then this overflow may cause false negatives in |
3b7a6418c dma debug: accoun... |
476 |
* debug_dma_assert_idle() as the cacheline may be marked idle |
0abdd7a81 dma-debug: introd... |
477 478 |
* prematurely. */ |
3b7a6418c dma debug: accoun... |
479 480 481 482 |
WARN_ONCE(overlap > ACTIVE_CACHELINE_MAX_OVERLAP, "DMA-API: exceeded %d overlapping mappings of cacheline %pa ", ACTIVE_CACHELINE_MAX_OVERLAP, &cln); |
0abdd7a81 dma-debug: introd... |
483 |
} |
3b7a6418c dma debug: accoun... |
484 |
static int active_cacheline_dec_overlap(phys_addr_t cln) |
0abdd7a81 dma-debug: introd... |
485 |
{ |
3b7a6418c dma debug: accoun... |
486 |
int overlap = active_cacheline_read_overlap(cln); |
0abdd7a81 dma-debug: introd... |
487 |
|
3b7a6418c dma debug: accoun... |
488 |
return active_cacheline_set_overlap(cln, --overlap); |
0abdd7a81 dma-debug: introd... |
489 |
} |
3b7a6418c dma debug: accoun... |
490 |
static int active_cacheline_insert(struct dma_debug_entry *entry) |
0abdd7a81 dma-debug: introd... |
491 |
{ |
3b7a6418c dma debug: accoun... |
492 |
phys_addr_t cln = to_cacheline_number(entry); |
0abdd7a81 dma-debug: introd... |
493 494 |
unsigned long flags; int rc; |
3b7a6418c dma debug: accoun... |
495 496 497 498 499 500 |
/* If the device is not writing memory then we don't have any * concerns about the cpu consuming stale data. This mitigates * legitimate usages of overlapping mappings. */ if (entry->direction == DMA_TO_DEVICE) return 0; |
0abdd7a81 dma-debug: introd... |
501 |
spin_lock_irqsave(&radix_lock, flags); |
3b7a6418c dma debug: accoun... |
502 |
rc = radix_tree_insert(&dma_active_cacheline, cln, entry); |
0abdd7a81 dma-debug: introd... |
503 |
if (rc == -EEXIST) |
3b7a6418c dma debug: accoun... |
504 |
active_cacheline_inc_overlap(cln); |
0abdd7a81 dma-debug: introd... |
505 506 507 508 |
spin_unlock_irqrestore(&radix_lock, flags); return rc; } |
3b7a6418c dma debug: accoun... |
509 |
static void active_cacheline_remove(struct dma_debug_entry *entry) |
0abdd7a81 dma-debug: introd... |
510 |
{ |
3b7a6418c dma debug: accoun... |
511 |
phys_addr_t cln = to_cacheline_number(entry); |
0abdd7a81 dma-debug: introd... |
512 |
unsigned long flags; |
3b7a6418c dma debug: accoun... |
513 514 515 |
/* ...mirror the insert case */ if (entry->direction == DMA_TO_DEVICE) return; |
0abdd7a81 dma-debug: introd... |
516 |
spin_lock_irqsave(&radix_lock, flags); |
59f2e7df5 dma-debug: fix ov... |
517 |
/* since we are counting overlaps the final put of the |
3b7a6418c dma debug: accoun... |
518 519 |
* cacheline will occur when the overlap count is 0. * active_cacheline_dec_overlap() returns -1 in that case |
59f2e7df5 dma-debug: fix ov... |
520 |
*/ |
3b7a6418c dma debug: accoun... |
521 522 |
if (active_cacheline_dec_overlap(cln) < 0) radix_tree_delete(&dma_active_cacheline, cln); |
0abdd7a81 dma-debug: introd... |
523 524 525 526 527 |
spin_unlock_irqrestore(&radix_lock, flags); } /** * debug_dma_assert_idle() - assert that a page is not undergoing dma |
3b7a6418c dma debug: accoun... |
528 |
* @page: page to lookup in the dma_active_cacheline tree |
0abdd7a81 dma-debug: introd... |
529 530 531 532 533 534 535 |
* * Place a call to this routine in cases where the cpu touching the page * before the dma completes (page is dma_unmapped) will lead to data * corruption. */ void debug_dma_assert_idle(struct page *page) { |
3b7a6418c dma debug: accoun... |
536 537 538 539 |
static struct dma_debug_entry *ents[CACHELINES_PER_PAGE]; struct dma_debug_entry *entry = NULL; void **results = (void **) &ents; unsigned int nents, i; |
0abdd7a81 dma-debug: introd... |
540 |
unsigned long flags; |
3b7a6418c dma debug: accoun... |
541 |
phys_addr_t cln; |
0abdd7a81 dma-debug: introd... |
542 |
|
39a0ac96d dma-debug: skip d... |
543 544 |
if (dma_debug_disabled()) return; |
0abdd7a81 dma-debug: introd... |
545 546 |
if (!page) return; |
3b7a6418c dma debug: accoun... |
547 |
cln = (phys_addr_t) page_to_pfn(page) << CACHELINE_PER_PAGE_SHIFT; |
0abdd7a81 dma-debug: introd... |
548 |
spin_lock_irqsave(&radix_lock, flags); |
3b7a6418c dma debug: accoun... |
549 550 551 552 553 554 555 556 557 558 559 |
nents = radix_tree_gang_lookup(&dma_active_cacheline, results, cln, CACHELINES_PER_PAGE); for (i = 0; i < nents; i++) { phys_addr_t ent_cln = to_cacheline_number(ents[i]); if (ent_cln == cln) { entry = ents[i]; break; } else if (ent_cln >= cln + CACHELINES_PER_PAGE) break; } |
0abdd7a81 dma-debug: introd... |
560 561 562 563 |
spin_unlock_irqrestore(&radix_lock, flags); if (!entry) return; |
3b7a6418c dma debug: accoun... |
564 |
cln = to_cacheline_number(entry); |
0abdd7a81 dma-debug: introd... |
565 |
err_printk(entry->dev, entry, |
3b7a6418c dma debug: accoun... |
566 567 568 |
"DMA-API: cpu touching an active dma mapped cacheline [cln=%pa] ", &cln); |
0abdd7a81 dma-debug: introd... |
569 570 571 |
} /* |
30dfa90cc dma-debug: add ha... |
572 573 574 575 576 577 578 |
* Wrapper function for adding an entry to the hash. * This function takes care of locking itself. */ static void add_dma_entry(struct dma_debug_entry *entry) { struct hash_bucket *bucket; unsigned long flags; |
0abdd7a81 dma-debug: introd... |
579 |
int rc; |
30dfa90cc dma-debug: add ha... |
580 581 582 583 |
bucket = get_hash_bucket(entry, &flags); hash_bucket_add(bucket, entry); put_hash_bucket(bucket, &flags); |
0abdd7a81 dma-debug: introd... |
584 |
|
3b7a6418c dma debug: accoun... |
585 |
rc = active_cacheline_insert(entry); |
0abdd7a81 dma-debug: introd... |
586 |
if (rc == -ENOMEM) { |
3b7a6418c dma debug: accoun... |
587 588 |
pr_err("DMA-API: cacheline tracking ENOMEM, dma-debug disabled "); |
0abdd7a81 dma-debug: introd... |
589 590 591 592 593 594 |
global_disable = true; } /* TODO: report -EEXIST errors here as overlapping mappings are * not supported by the DMA API */ |
30dfa90cc dma-debug: add ha... |
595 |
} |
e6a1a89d5 dma-debug: add dm... |
596 597 598 599 600 601 602 603 604 605 606 607 608 609 |
static struct dma_debug_entry *__dma_entry_alloc(void) { struct dma_debug_entry *entry; entry = list_entry(free_entries.next, struct dma_debug_entry, list); list_del(&entry->list); memset(entry, 0, sizeof(*entry)); num_free_entries -= 1; if (num_free_entries < min_free_entries) min_free_entries = num_free_entries; return entry; } |
3b1e79ed7 dma-debug: add al... |
610 611 612 613 614 615 616 |
/* struct dma_entry allocator * * The next two functions implement the allocator for * struct dma_debug_entries. */ static struct dma_debug_entry *dma_entry_alloc(void) { |
29cdd4e4e dma-debug: releas... |
617 |
struct dma_debug_entry *entry; |
3b1e79ed7 dma-debug: add al... |
618 619 620 621 622 |
unsigned long flags; spin_lock_irqsave(&free_entries_lock, flags); if (list_empty(&free_entries)) { |
e7ed70eed dma-debug: use pr... |
623 624 |
pr_err("DMA-API: debugging out of memory - disabling "); |
3b1e79ed7 dma-debug: add al... |
625 |
global_disable = true; |
29cdd4e4e dma-debug: releas... |
626 627 |
spin_unlock_irqrestore(&free_entries_lock, flags); return NULL; |
3b1e79ed7 dma-debug: add al... |
628 |
} |
e6a1a89d5 dma-debug: add dm... |
629 |
entry = __dma_entry_alloc(); |
3b1e79ed7 dma-debug: add al... |
630 |
|
29cdd4e4e dma-debug: releas... |
631 |
spin_unlock_irqrestore(&free_entries_lock, flags); |
6c132d1bc dma-debug: print ... |
632 633 634 635 636 637 |
#ifdef CONFIG_STACKTRACE entry->stacktrace.max_entries = DMA_DEBUG_STACKTRACE_ENTRIES; entry->stacktrace.entries = entry->st_entries; entry->stacktrace.skip = 2; save_stack_trace(&entry->stacktrace); #endif |
3b1e79ed7 dma-debug: add al... |
638 |
|
3b1e79ed7 dma-debug: add al... |
639 640 641 642 643 644 |
return entry; } static void dma_entry_free(struct dma_debug_entry *entry) { unsigned long flags; |
3b7a6418c dma debug: accoun... |
645 |
active_cacheline_remove(entry); |
0abdd7a81 dma-debug: introd... |
646 |
|
3b1e79ed7 dma-debug: add al... |
647 648 649 650 651 652 653 654 655 |
/* * add to beginning of the list - this way the entries are * more likely cache hot when they are reallocated. */ spin_lock_irqsave(&free_entries_lock, flags); list_add(&entry->list, &free_entries); num_free_entries += 1; spin_unlock_irqrestore(&free_entries_lock, flags); } |
e6a1a89d5 dma-debug: add dm... |
656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 |
int dma_debug_resize_entries(u32 num_entries) { int i, delta, ret = 0; unsigned long flags; struct dma_debug_entry *entry; LIST_HEAD(tmp); spin_lock_irqsave(&free_entries_lock, flags); if (nr_total_entries < num_entries) { delta = num_entries - nr_total_entries; spin_unlock_irqrestore(&free_entries_lock, flags); for (i = 0; i < delta; i++) { entry = kzalloc(sizeof(*entry), GFP_KERNEL); if (!entry) break; list_add_tail(&entry->list, &tmp); } spin_lock_irqsave(&free_entries_lock, flags); list_splice(&tmp, &free_entries); nr_total_entries += i; num_free_entries += i; } else { delta = nr_total_entries - num_entries; for (i = 0; i < delta && !list_empty(&free_entries); i++) { entry = __dma_entry_alloc(); kfree(entry); } nr_total_entries -= i; } if (nr_total_entries != num_entries) ret = 1; spin_unlock_irqrestore(&free_entries_lock, flags); return ret; } EXPORT_SYMBOL(dma_debug_resize_entries); |
6bf078715 dma-debug: add in... |
702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 |
/* * DMA-API debugging init code * * The init code does two things: * 1. Initialize core data structures * 2. Preallocate a given number of dma_debug_entry structs */ static int prealloc_memory(u32 num_entries) { struct dma_debug_entry *entry, *next_entry; int i; for (i = 0; i < num_entries; ++i) { entry = kzalloc(sizeof(*entry), GFP_KERNEL); if (!entry) goto out_err; list_add_tail(&entry->list, &free_entries); } num_free_entries = num_entries; min_free_entries = num_entries; |
e7ed70eed dma-debug: use pr... |
725 726 |
pr_info("DMA-API: preallocated %d debug entries ", num_entries); |
6bf078715 dma-debug: add in... |
727 728 729 730 731 732 733 734 735 736 737 738 |
return 0; out_err: list_for_each_entry_safe(entry, next_entry, &free_entries, list) { list_del(&entry->list); kfree(entry); } return -ENOMEM; } |
8a6fc708b dma-debug: add de... |
739 740 741 |
static ssize_t filter_read(struct file *file, char __user *user_buf, size_t count, loff_t *ppos) { |
8a6fc708b dma-debug: add de... |
742 |
char buf[NAME_MAX_LEN + 1]; |
c17e2cf73 dma-debug: code s... |
743 |
unsigned long flags; |
8a6fc708b dma-debug: add de... |
744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 |
int len; if (!current_driver_name[0]) return 0; /* * We can't copy to userspace directly because current_driver_name can * only be read under the driver_name_lock with irqs disabled. So * create a temporary copy first. */ read_lock_irqsave(&driver_name_lock, flags); len = scnprintf(buf, NAME_MAX_LEN + 1, "%s ", current_driver_name); read_unlock_irqrestore(&driver_name_lock, flags); return simple_read_from_buffer(user_buf, count, ppos, buf, len); } static ssize_t filter_write(struct file *file, const char __user *userbuf, size_t count, loff_t *ppos) { |
8a6fc708b dma-debug: add de... |
765 |
char buf[NAME_MAX_LEN]; |
c17e2cf73 dma-debug: code s... |
766 767 |
unsigned long flags; size_t len; |
8a6fc708b dma-debug: add de... |
768 769 770 771 772 773 774 775 |
int i; /* * We can't copy from userspace directly. Access to * current_driver_name is protected with a write_lock with irqs * disabled. Since copy_from_user can fault and may sleep we * need to copy to temporary buffer first */ |
e7ed70eed dma-debug: use pr... |
776 |
len = min(count, (size_t)(NAME_MAX_LEN - 1)); |
8a6fc708b dma-debug: add de... |
777 778 779 780 781 782 |
if (copy_from_user(buf, userbuf, len)) return -EFAULT; buf[len] = 0; write_lock_irqsave(&driver_name_lock, flags); |
312325094 dma-debug: commen... |
783 784 |
/* * Now handle the string we got from userspace very carefully. |
8a6fc708b dma-debug: add de... |
785 786 787 788 789 790 791 792 793 |
* The rules are: * - only use the first token we got * - token delimiter is everything looking like a space * character (' ', ' ', '\t' ...) * */ if (!isalnum(buf[0])) { /* |
312325094 dma-debug: commen... |
794 |
* If the first character userspace gave us is not |
8a6fc708b dma-debug: add de... |
795 796 797 798 |
* alphanumerical then assume the filter should be * switched off. */ if (current_driver_name[0]) |
e7ed70eed dma-debug: use pr... |
799 800 |
pr_info("DMA-API: switching off dma-debug driver filter "); |
8a6fc708b dma-debug: add de... |
801 802 803 804 805 806 807 808 809 |
current_driver_name[0] = 0; current_driver = NULL; goto out_unlock; } /* * Now parse out the first token and use it as the name for the * driver to filter for. */ |
39a37ce1c dma-debug: Cleanu... |
810 |
for (i = 0; i < NAME_MAX_LEN - 1; ++i) { |
8a6fc708b dma-debug: add de... |
811 812 813 814 815 816 |
current_driver_name[i] = buf[i]; if (isspace(buf[i]) || buf[i] == ' ' || buf[i] == 0) break; } current_driver_name[i] = 0; current_driver = NULL; |
e7ed70eed dma-debug: use pr... |
817 818 819 |
pr_info("DMA-API: enable driver filter for driver [%s] ", current_driver_name); |
8a6fc708b dma-debug: add de... |
820 821 822 823 824 825 |
out_unlock: write_unlock_irqrestore(&driver_name_lock, flags); return count; } |
aeb583d08 lib/dma-debug.c: ... |
826 |
static const struct file_operations filter_fops = { |
8a6fc708b dma-debug: add de... |
827 828 |
.read = filter_read, .write = filter_write, |
6038f373a llseek: automatic... |
829 |
.llseek = default_llseek, |
8a6fc708b dma-debug: add de... |
830 |
}; |
788dcfa6f dma-debug: add de... |
831 832 833 834 |
static int dma_debug_fs_init(void) { dma_debug_dent = debugfs_create_dir("dma-api", NULL); if (!dma_debug_dent) { |
e7ed70eed dma-debug: use pr... |
835 836 |
pr_err("DMA-API: can not create debugfs directory "); |
788dcfa6f dma-debug: add de... |
837 838 839 840 841 |
return -ENOMEM; } global_disable_dent = debugfs_create_bool("disabled", 0444, dma_debug_dent, |
68ee6d223 dma-debug: debugf... |
842 |
&global_disable); |
788dcfa6f dma-debug: add de... |
843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 |
if (!global_disable_dent) goto out_err; error_count_dent = debugfs_create_u32("error_count", 0444, dma_debug_dent, &error_count); if (!error_count_dent) goto out_err; show_all_errors_dent = debugfs_create_u32("all_errors", 0644, dma_debug_dent, &show_all_errors); if (!show_all_errors_dent) goto out_err; show_num_errors_dent = debugfs_create_u32("num_errors", 0644, dma_debug_dent, &show_num_errors); if (!show_num_errors_dent) goto out_err; num_free_entries_dent = debugfs_create_u32("num_free_entries", 0444, dma_debug_dent, &num_free_entries); if (!num_free_entries_dent) goto out_err; min_free_entries_dent = debugfs_create_u32("min_free_entries", 0444, dma_debug_dent, &min_free_entries); if (!min_free_entries_dent) goto out_err; |
8a6fc708b dma-debug: add de... |
874 875 876 877 |
filter_dent = debugfs_create_file("driver_filter", 0644, dma_debug_dent, NULL, &filter_fops); if (!filter_dent) goto out_err; |
788dcfa6f dma-debug: add de... |
878 879 880 881 882 883 884 |
return 0; out_err: debugfs_remove_recursive(dma_debug_dent); return -ENOMEM; } |
ba4b87ad5 dma-debug: print ... |
885 |
static int device_dma_allocations(struct device *dev, struct dma_debug_entry **out_entry) |
ed888aef4 dma-debug: re-add... |
886 887 888 889 |
{ struct dma_debug_entry *entry; unsigned long flags; int count = 0, i; |
be81c6ea2 dma-debug: disabl... |
890 |
local_irq_save(flags); |
ed888aef4 dma-debug: re-add... |
891 |
for (i = 0; i < HASH_SIZE; ++i) { |
be81c6ea2 dma-debug: disabl... |
892 |
spin_lock(&dma_entry_hash[i].lock); |
ed888aef4 dma-debug: re-add... |
893 |
list_for_each_entry(entry, &dma_entry_hash[i].list, list) { |
ba4b87ad5 dma-debug: print ... |
894 |
if (entry->dev == dev) { |
ed888aef4 dma-debug: re-add... |
895 |
count += 1; |
ba4b87ad5 dma-debug: print ... |
896 897 |
*out_entry = entry; } |
ed888aef4 dma-debug: re-add... |
898 |
} |
be81c6ea2 dma-debug: disabl... |
899 |
spin_unlock(&dma_entry_hash[i].lock); |
ed888aef4 dma-debug: re-add... |
900 |
} |
be81c6ea2 dma-debug: disabl... |
901 |
local_irq_restore(flags); |
ed888aef4 dma-debug: re-add... |
902 903 |
return count; } |
a8fe9ea20 dma-debug: Fix bu... |
904 |
static int dma_debug_device_change(struct notifier_block *nb, unsigned long action, void *data) |
ed888aef4 dma-debug: re-add... |
905 906 |
{ struct device *dev = data; |
ba4b87ad5 dma-debug: print ... |
907 |
struct dma_debug_entry *uninitialized_var(entry); |
ed888aef4 dma-debug: re-add... |
908 |
int count; |
01ce18b31 dma-debug: introd... |
909 |
if (dma_debug_disabled()) |
a8fe9ea20 dma-debug: Fix bu... |
910 |
return 0; |
ed888aef4 dma-debug: re-add... |
911 912 913 |
switch (action) { case BUS_NOTIFY_UNBOUND_DRIVER: |
ba4b87ad5 dma-debug: print ... |
914 |
count = device_dma_allocations(dev, &entry); |
ed888aef4 dma-debug: re-add... |
915 916 |
if (count == 0) break; |
ba4b87ad5 dma-debug: print ... |
917 |
err_printk(dev, entry, "DMA-API: device driver has pending " |
ed888aef4 dma-debug: re-add... |
918 |
"DMA allocations while released from device " |
ba4b87ad5 dma-debug: print ... |
919 920 921 922 923 924 925 926 |
"[count=%d] " "One of leaked entries details: " "[device address=0x%016llx] [size=%llu bytes] " "[mapped with %s] [mapped as %s] ", count, entry->dev_addr, entry->size, dir2name[entry->direction], type2name[entry->type]); |
ed888aef4 dma-debug: re-add... |
927 928 929 930 931 932 933 |
break; default: break; } return 0; } |
41531c8f5 dma-debug: add a ... |
934 935 |
void dma_debug_add_bus(struct bus_type *bus) { |
ed888aef4 dma-debug: re-add... |
936 |
struct notifier_block *nb; |
01ce18b31 dma-debug: introd... |
937 |
if (dma_debug_disabled()) |
f797d9881 dma-debug: Do not... |
938 |
return; |
ed888aef4 dma-debug: re-add... |
939 940 |
nb = kzalloc(sizeof(struct notifier_block), GFP_KERNEL); if (nb == NULL) { |
e7ed70eed dma-debug: use pr... |
941 942 |
pr_err("dma_debug_add_bus: out of memory "); |
ed888aef4 dma-debug: re-add... |
943 944 945 946 947 948 |
return; } nb->notifier_call = dma_debug_device_change; bus_register_notifier(bus, nb); |
41531c8f5 dma-debug: add a ... |
949 |
} |
788dcfa6f dma-debug: add de... |
950 |
|
6bf078715 dma-debug: add in... |
951 952 953 954 955 956 |
/* * Let the architectures decide how many entries should be preallocated. */ void dma_debug_init(u32 num_entries) { int i; |
2ce8e7ed0 dma-debug: preven... |
957 958 959 960 |
/* Do not use dma_debug_initialized here, since we really want to be * called to set dma_debug_initialized */ if (global_disable) |
6bf078715 dma-debug: add in... |
961 962 963 964 |
return; for (i = 0; i < HASH_SIZE; ++i) { INIT_LIST_HEAD(&dma_entry_hash[i].list); |
b0a5b83ee dma-debug: Put al... |
965 |
spin_lock_init(&dma_entry_hash[i].lock); |
6bf078715 dma-debug: add in... |
966 |
} |
788dcfa6f dma-debug: add de... |
967 |
if (dma_debug_fs_init() != 0) { |
e7ed70eed dma-debug: use pr... |
968 969 |
pr_err("DMA-API: error creating debugfs entries - disabling "); |
788dcfa6f dma-debug: add de... |
970 971 972 973 |
global_disable = true; return; } |
59d3daafa dma-debug: add ke... |
974 975 |
if (req_entries) num_entries = req_entries; |
6bf078715 dma-debug: add in... |
976 |
if (prealloc_memory(num_entries) != 0) { |
e7ed70eed dma-debug: use pr... |
977 978 |
pr_err("DMA-API: debugging out of memory error - disabled "); |
6bf078715 dma-debug: add in... |
979 980 981 982 |
global_disable = true; return; } |
e6a1a89d5 dma-debug: add dm... |
983 |
nr_total_entries = num_free_entries; |
2ce8e7ed0 dma-debug: preven... |
984 |
dma_debug_initialized = true; |
e7ed70eed dma-debug: use pr... |
985 986 |
pr_info("DMA-API: debugging enabled by kernel config "); |
6bf078715 dma-debug: add in... |
987 |
} |
59d3daafa dma-debug: add ke... |
988 989 990 991 992 993 |
static __init int dma_debug_cmdline(char *str) { if (!str) return -EINVAL; if (strncmp(str, "off", 3) == 0) { |
e7ed70eed dma-debug: use pr... |
994 995 |
pr_info("DMA-API: debugging disabled on kernel command line "); |
59d3daafa dma-debug: add ke... |
996 997 998 999 1000 1001 1002 1003 1004 1005 1006 1007 1008 1009 1010 1011 1012 1013 1014 1015 1016 1017 1018 |
global_disable = true; } return 0; } static __init int dma_debug_entries_cmdline(char *str) { int res; if (!str) return -EINVAL; res = get_option(&str, &req_entries); if (!res) req_entries = 0; return 0; } __setup("dma_debug=", dma_debug_cmdline); __setup("dma_debug_entries=", dma_debug_entries_cmdline); |
2d62ece14 dma-debug: add co... |
1019 1020 1021 1022 1023 |
static void check_unmap(struct dma_debug_entry *ref) { struct dma_debug_entry *entry; struct hash_bucket *bucket; unsigned long flags; |
2d62ece14 dma-debug: add co... |
1024 |
bucket = get_hash_bucket(ref, &flags); |
c6a21d0b8 dma-debug: hash_b... |
1025 |
entry = bucket_find_exact(bucket, ref); |
2d62ece14 dma-debug: add co... |
1026 1027 |
if (!entry) { |
8d640a51e dma-debug: fix lo... |
1028 1029 |
/* must drop lock before calling dma_mapping_error */ put_hash_bucket(bucket, &flags); |
bfe0fb0f1 dma-debug: fix to... |
1030 1031 |
if (dma_mapping_error(ref->dev, ref->dev_addr)) { err_printk(ref->dev, NULL, |
8d640a51e dma-debug: fix lo... |
1032 1033 1034 1035 1036 1037 1038 1039 1040 1041 |
"DMA-API: device driver tries to free an " "invalid DMA memory address "); } else { err_printk(ref->dev, NULL, "DMA-API: device driver tries to free DMA " "memory it has not allocated [device " "address=0x%016llx] [size=%llu bytes] ", ref->dev_addr, ref->size); |
bfe0fb0f1 dma-debug: fix to... |
1042 |
} |
8d640a51e dma-debug: fix lo... |
1043 |
return; |
2d62ece14 dma-debug: add co... |
1044 1045 1046 |
} if (ref->size != entry->size) { |
6c132d1bc dma-debug: print ... |
1047 |
err_printk(ref->dev, entry, "DMA-API: device driver frees " |
2d62ece14 dma-debug: add co... |
1048 1049 1050 1051 1052 1053 1054 1055 |
"DMA memory with different size " "[device address=0x%016llx] [map size=%llu bytes] " "[unmap size=%llu bytes] ", ref->dev_addr, entry->size, ref->size); } if (ref->type != entry->type) { |
6c132d1bc dma-debug: print ... |
1056 |
err_printk(ref->dev, entry, "DMA-API: device driver frees " |
2d62ece14 dma-debug: add co... |
1057 1058 1059 1060 1061 1062 1063 |
"DMA memory with wrong function " "[device address=0x%016llx] [size=%llu bytes] " "[mapped as %s] [unmapped as %s] ", ref->dev_addr, ref->size, type2name[entry->type], type2name[ref->type]); } else if ((entry->type == dma_debug_coherent) && |
0abdd7a81 dma-debug: introd... |
1064 |
(phys_addr(ref) != phys_addr(entry))) { |
6c132d1bc dma-debug: print ... |
1065 |
err_printk(ref->dev, entry, "DMA-API: device driver frees " |
2d62ece14 dma-debug: add co... |
1066 1067 |
"DMA memory with different CPU address " "[device address=0x%016llx] [size=%llu bytes] " |
59a40e704 dma-debug: Fix co... |
1068 1069 |
"[cpu alloc address=0x%016llx] " "[cpu free address=0x%016llx]", |
2d62ece14 dma-debug: add co... |
1070 |
ref->dev_addr, ref->size, |
0abdd7a81 dma-debug: introd... |
1071 1072 |
phys_addr(entry), phys_addr(ref)); |
2d62ece14 dma-debug: add co... |
1073 1074 1075 1076 |
} if (ref->sg_call_ents && ref->type == dma_debug_sg && ref->sg_call_ents != entry->sg_call_ents) { |
6c132d1bc dma-debug: print ... |
1077 |
err_printk(ref->dev, entry, "DMA-API: device driver frees " |
2d62ece14 dma-debug: add co... |
1078 1079 1080 1081 1082 1083 1084 1085 1086 1087 1088 |
"DMA sg list with different entry count " "[map count=%d] [unmap count=%d] ", entry->sg_call_ents, ref->sg_call_ents); } /* * This may be no bug in reality - but most implementations of the * DMA API don't handle this properly, so check for it here */ if (ref->direction != entry->direction) { |
6c132d1bc dma-debug: print ... |
1089 |
err_printk(ref->dev, entry, "DMA-API: device driver frees " |
2d62ece14 dma-debug: add co... |
1090 1091 1092 1093 1094 1095 1096 1097 |
"DMA memory with different direction " "[device address=0x%016llx] [size=%llu bytes] " "[mapped with %s] [unmapped with %s] ", ref->dev_addr, ref->size, dir2name[entry->direction], dir2name[ref->direction]); } |
6c9c6d630 dma-debug: New in... |
1098 1099 1100 1101 1102 1103 1104 1105 |
if (entry->map_err_type == MAP_ERR_NOT_CHECKED) { err_printk(ref->dev, entry, "DMA-API: device driver failed to check map error" "[device address=0x%016llx] [size=%llu bytes] " "[mapped as %s]", ref->dev_addr, ref->size, type2name[entry->type]); } |
2d62ece14 dma-debug: add co... |
1106 1107 |
hash_bucket_del(entry); dma_entry_free(entry); |
2d62ece14 dma-debug: add co... |
1108 1109 1110 1111 1112 1113 |
put_hash_bucket(bucket, &flags); } static void check_for_stack(struct device *dev, void *addr) { if (object_is_on_stack(addr)) |
f9134be49 dma-debug: modify... |
1114 |
err_printk(dev, NULL, "DMA-API: device driver maps memory from " |
6c132d1bc dma-debug: print ... |
1115 1116 |
"stack [addr=%p] ", addr); |
2d62ece14 dma-debug: add co... |
1117 |
} |
f39d1b979 dma-debug: Fix th... |
1118 |
static inline bool overlap(void *addr, unsigned long len, void *start, void *end) |
2e34bde18 dma-debug: add ch... |
1119 |
{ |
f39d1b979 dma-debug: Fix th... |
1120 1121 1122 1123 |
unsigned long a1 = (unsigned long)addr; unsigned long b1 = a1 + len; unsigned long a2 = (unsigned long)start; unsigned long b2 = (unsigned long)end; |
2e34bde18 dma-debug: add ch... |
1124 |
|
f39d1b979 dma-debug: Fix th... |
1125 |
return !(b1 <= a2 || a1 >= b2); |
2e34bde18 dma-debug: add ch... |
1126 |
} |
f39d1b979 dma-debug: Fix th... |
1127 |
static void check_for_illegal_area(struct device *dev, void *addr, unsigned long len) |
2e34bde18 dma-debug: add ch... |
1128 |
{ |
f39d1b979 dma-debug: Fix th... |
1129 1130 1131 1132 |
if (overlap(addr, len, _text, _etext) || overlap(addr, len, __start_rodata, __end_rodata)) err_printk(dev, NULL, "DMA-API: device driver maps memory from kernel text or rodata [addr=%p] [len=%lu] ", addr, len); |
2e34bde18 dma-debug: add ch... |
1133 |
} |
aa010efb7 dma-debug: be mor... |
1134 1135 1136 |
static void check_sync(struct device *dev, struct dma_debug_entry *ref, bool to_cpu) |
2d62ece14 dma-debug: add co... |
1137 |
{ |
2d62ece14 dma-debug: add co... |
1138 1139 1140 |
struct dma_debug_entry *entry; struct hash_bucket *bucket; unsigned long flags; |
aa010efb7 dma-debug: be mor... |
1141 |
bucket = get_hash_bucket(ref, &flags); |
2d62ece14 dma-debug: add co... |
1142 |
|
c6a21d0b8 dma-debug: hash_b... |
1143 |
entry = bucket_find_contain(&bucket, ref, &flags); |
2d62ece14 dma-debug: add co... |
1144 1145 |
if (!entry) { |
6c132d1bc dma-debug: print ... |
1146 |
err_printk(dev, NULL, "DMA-API: device driver tries " |
2d62ece14 dma-debug: add co... |
1147 1148 1149 |
"to sync DMA memory it has not allocated " "[device address=0x%016llx] [size=%llu bytes] ", |
aa010efb7 dma-debug: be mor... |
1150 |
(unsigned long long)ref->dev_addr, ref->size); |
2d62ece14 dma-debug: add co... |
1151 1152 |
goto out; } |
aa010efb7 dma-debug: be mor... |
1153 |
if (ref->size > entry->size) { |
6c132d1bc dma-debug: print ... |
1154 |
err_printk(dev, entry, "DMA-API: device driver syncs" |
2d62ece14 dma-debug: add co... |
1155 1156 |
" DMA memory outside allocated range " "[device address=0x%016llx] " |
aa010efb7 dma-debug: be mor... |
1157 1158 1159 1160 1161 |
"[allocation size=%llu bytes] " "[sync offset+size=%llu] ", entry->dev_addr, entry->size, ref->size); |
2d62ece14 dma-debug: add co... |
1162 |
} |
42d53b4ff dma-debug: allow ... |
1163 1164 |
if (entry->direction == DMA_BIDIRECTIONAL) goto out; |
aa010efb7 dma-debug: be mor... |
1165 |
if (ref->direction != entry->direction) { |
6c132d1bc dma-debug: print ... |
1166 |
err_printk(dev, entry, "DMA-API: device driver syncs " |
2d62ece14 dma-debug: add co... |
1167 1168 1169 1170 |
"DMA memory with different direction " "[device address=0x%016llx] [size=%llu bytes] " "[mapped with %s] [synced with %s] ", |
aa010efb7 dma-debug: be mor... |
1171 |
(unsigned long long)ref->dev_addr, entry->size, |
2d62ece14 dma-debug: add co... |
1172 |
dir2name[entry->direction], |
aa010efb7 dma-debug: be mor... |
1173 |
dir2name[ref->direction]); |
2d62ece14 dma-debug: add co... |
1174 |
} |
2d62ece14 dma-debug: add co... |
1175 |
if (to_cpu && !(entry->direction == DMA_FROM_DEVICE) && |
aa010efb7 dma-debug: be mor... |
1176 |
!(ref->direction == DMA_TO_DEVICE)) |
6c132d1bc dma-debug: print ... |
1177 |
err_printk(dev, entry, "DMA-API: device driver syncs " |
2d62ece14 dma-debug: add co... |
1178 1179 1180 1181 |
"device read-only DMA memory for cpu " "[device address=0x%016llx] [size=%llu bytes] " "[mapped with %s] [synced with %s] ", |
aa010efb7 dma-debug: be mor... |
1182 |
(unsigned long long)ref->dev_addr, entry->size, |
2d62ece14 dma-debug: add co... |
1183 |
dir2name[entry->direction], |
aa010efb7 dma-debug: be mor... |
1184 |
dir2name[ref->direction]); |
2d62ece14 dma-debug: add co... |
1185 1186 |
if (!to_cpu && !(entry->direction == DMA_TO_DEVICE) && |
aa010efb7 dma-debug: be mor... |
1187 |
!(ref->direction == DMA_FROM_DEVICE)) |
6c132d1bc dma-debug: print ... |
1188 |
err_printk(dev, entry, "DMA-API: device driver syncs " |
2d62ece14 dma-debug: add co... |
1189 1190 1191 1192 |
"device write-only DMA memory to device " "[device address=0x%016llx] [size=%llu bytes] " "[mapped with %s] [synced with %s] ", |
aa010efb7 dma-debug: be mor... |
1193 |
(unsigned long long)ref->dev_addr, entry->size, |
2d62ece14 dma-debug: add co... |
1194 |
dir2name[entry->direction], |
aa010efb7 dma-debug: be mor... |
1195 |
dir2name[ref->direction]); |
2d62ece14 dma-debug: add co... |
1196 1197 1198 |
out: put_hash_bucket(bucket, &flags); |
2d62ece14 dma-debug: add co... |
1199 |
} |
f62bc980e dma-debug: add ch... |
1200 1201 1202 1203 1204 |
void debug_dma_map_page(struct device *dev, struct page *page, size_t offset, size_t size, int direction, dma_addr_t dma_addr, bool map_single) { struct dma_debug_entry *entry; |
01ce18b31 dma-debug: introd... |
1205 |
if (unlikely(dma_debug_disabled())) |
f62bc980e dma-debug: add ch... |
1206 |
return; |
bfe0fb0f1 dma-debug: fix to... |
1207 |
if (dma_mapping_error(dev, dma_addr)) |
f62bc980e dma-debug: add ch... |
1208 1209 1210 1211 1212 1213 1214 1215 |
return; entry = dma_entry_alloc(); if (!entry) return; entry->dev = dev; entry->type = dma_debug_page; |
0abdd7a81 dma-debug: introd... |
1216 1217 |
entry->pfn = page_to_pfn(page); entry->offset = offset, |
f62bc980e dma-debug: add ch... |
1218 1219 1220 |
entry->dev_addr = dma_addr; entry->size = size; entry->direction = direction; |
6c9c6d630 dma-debug: New in... |
1221 |
entry->map_err_type = MAP_ERR_NOT_CHECKED; |
f62bc980e dma-debug: add ch... |
1222 |
|
9537a48ed dma-debug: make m... |
1223 |
if (map_single) |
f62bc980e dma-debug: add ch... |
1224 |
entry->type = dma_debug_single; |
9537a48ed dma-debug: make m... |
1225 1226 |
if (!PageHighMem(page)) { |
f39d1b979 dma-debug: Fix th... |
1227 |
void *addr = page_address(page) + offset; |
2e34bde18 dma-debug: add ch... |
1228 1229 |
check_for_stack(dev, addr); check_for_illegal_area(dev, addr, size); |
f62bc980e dma-debug: add ch... |
1230 1231 1232 1233 1234 |
} add_dma_entry(entry); } EXPORT_SYMBOL(debug_dma_map_page); |
6c9c6d630 dma-debug: New in... |
1235 1236 1237 1238 1239 1240 |
void debug_dma_mapping_error(struct device *dev, dma_addr_t dma_addr) { struct dma_debug_entry ref; struct dma_debug_entry *entry; struct hash_bucket *bucket; unsigned long flags; |
01ce18b31 dma-debug: introd... |
1241 |
if (unlikely(dma_debug_disabled())) |
6c9c6d630 dma-debug: New in... |
1242 1243 1244 1245 1246 |
return; ref.dev = dev; ref.dev_addr = dma_addr; bucket = get_hash_bucket(&ref, &flags); |
6c9c6d630 dma-debug: New in... |
1247 |
|
96e7d7a1e dma-debug: update... |
1248 1249 1250 1251 1252 1253 1254 1255 1256 1257 1258 1259 1260 1261 1262 1263 1264 1265 1266 |
list_for_each_entry(entry, &bucket->list, list) { if (!exact_match(&ref, entry)) continue; /* * The same physical address can be mapped multiple * times. Without a hardware IOMMU this results in the * same device addresses being put into the dma-debug * hash multiple times too. This can result in false * positives being reported. Therefore we implement a * best-fit algorithm here which updates the first entry * from the hash which fits the reference value and is * not currently listed as being checked. */ if (entry->map_err_type == MAP_ERR_NOT_CHECKED) { entry->map_err_type = MAP_ERR_CHECKED; break; } } |
6c9c6d630 dma-debug: New in... |
1267 |
|
6c9c6d630 dma-debug: New in... |
1268 1269 1270 |
put_hash_bucket(bucket, &flags); } EXPORT_SYMBOL(debug_dma_mapping_error); |
f62bc980e dma-debug: add ch... |
1271 1272 1273 1274 1275 1276 1277 1278 1279 1280 |
void debug_dma_unmap_page(struct device *dev, dma_addr_t addr, size_t size, int direction, bool map_single) { struct dma_debug_entry ref = { .type = dma_debug_page, .dev = dev, .dev_addr = addr, .size = size, .direction = direction, }; |
01ce18b31 dma-debug: introd... |
1281 |
if (unlikely(dma_debug_disabled())) |
f62bc980e dma-debug: add ch... |
1282 1283 1284 1285 1286 1287 1288 1289 |
return; if (map_single) ref.type = dma_debug_single; check_unmap(&ref); } EXPORT_SYMBOL(debug_dma_unmap_page); |
972aa45ce dma-debug: add ad... |
1290 1291 1292 1293 1294 1295 |
void debug_dma_map_sg(struct device *dev, struct scatterlist *sg, int nents, int mapped_ents, int direction) { struct dma_debug_entry *entry; struct scatterlist *s; int i; |
01ce18b31 dma-debug: introd... |
1296 |
if (unlikely(dma_debug_disabled())) |
972aa45ce dma-debug: add ad... |
1297 1298 1299 1300 1301 1302 1303 1304 1305 |
return; for_each_sg(sg, s, mapped_ents, i) { entry = dma_entry_alloc(); if (!entry) return; entry->type = dma_debug_sg; entry->dev = dev; |
0abdd7a81 dma-debug: introd... |
1306 1307 |
entry->pfn = page_to_pfn(sg_page(s)); entry->offset = s->offset, |
884d05970 dma-debug: use sg... |
1308 |
entry->size = sg_dma_len(s); |
15aedea43 dma-debug: use sg... |
1309 |
entry->dev_addr = sg_dma_address(s); |
972aa45ce dma-debug: add ad... |
1310 1311 1312 |
entry->direction = direction; entry->sg_call_ents = nents; entry->sg_mapped_ents = mapped_ents; |
9537a48ed dma-debug: make m... |
1313 1314 |
if (!PageHighMem(sg_page(s))) { check_for_stack(dev, sg_virt(s)); |
884d05970 dma-debug: use sg... |
1315 |
check_for_illegal_area(dev, sg_virt(s), sg_dma_len(s)); |
9537a48ed dma-debug: make m... |
1316 |
} |
972aa45ce dma-debug: add ad... |
1317 1318 1319 1320 1321 |
add_dma_entry(entry); } } EXPORT_SYMBOL(debug_dma_map_sg); |
aa010efb7 dma-debug: be mor... |
1322 1323 |
static int get_nr_mapped_entries(struct device *dev, struct dma_debug_entry *ref) |
88f3907f6 dma-debug: fix de... |
1324 |
{ |
aa010efb7 dma-debug: be mor... |
1325 |
struct dma_debug_entry *entry; |
88f3907f6 dma-debug: fix de... |
1326 1327 |
struct hash_bucket *bucket; unsigned long flags; |
c17e2cf73 dma-debug: code s... |
1328 |
int mapped_ents; |
88f3907f6 dma-debug: fix de... |
1329 |
|
aa010efb7 dma-debug: be mor... |
1330 |
bucket = get_hash_bucket(ref, &flags); |
c6a21d0b8 dma-debug: hash_b... |
1331 |
entry = bucket_find_exact(bucket, ref); |
c17e2cf73 dma-debug: code s... |
1332 |
mapped_ents = 0; |
88f3907f6 dma-debug: fix de... |
1333 |
|
88f3907f6 dma-debug: fix de... |
1334 1335 1336 1337 1338 1339 |
if (entry) mapped_ents = entry->sg_mapped_ents; put_hash_bucket(bucket, &flags); return mapped_ents; } |
972aa45ce dma-debug: add ad... |
1340 1341 1342 |
void debug_dma_unmap_sg(struct device *dev, struct scatterlist *sglist, int nelems, int dir) { |
972aa45ce dma-debug: add ad... |
1343 1344 |
struct scatterlist *s; int mapped_ents = 0, i; |
972aa45ce dma-debug: add ad... |
1345 |
|
01ce18b31 dma-debug: introd... |
1346 |
if (unlikely(dma_debug_disabled())) |
972aa45ce dma-debug: add ad... |
1347 1348 1349 1350 1351 1352 1353 |
return; for_each_sg(sglist, s, nelems, i) { struct dma_debug_entry ref = { .type = dma_debug_sg, .dev = dev, |
0abdd7a81 dma-debug: introd... |
1354 1355 |
.pfn = page_to_pfn(sg_page(s)), .offset = s->offset, |
15aedea43 dma-debug: use sg... |
1356 |
.dev_addr = sg_dma_address(s), |
884d05970 dma-debug: use sg... |
1357 |
.size = sg_dma_len(s), |
972aa45ce dma-debug: add ad... |
1358 |
.direction = dir, |
e5e8c5b90 dma-debug: check ... |
1359 |
.sg_call_ents = nelems, |
972aa45ce dma-debug: add ad... |
1360 1361 1362 1363 |
}; if (mapped_ents && i >= mapped_ents) break; |
e5e8c5b90 dma-debug: check ... |
1364 |
if (!i) |
aa010efb7 dma-debug: be mor... |
1365 |
mapped_ents = get_nr_mapped_entries(dev, &ref); |
972aa45ce dma-debug: add ad... |
1366 1367 1368 1369 1370 |
check_unmap(&ref); } } EXPORT_SYMBOL(debug_dma_unmap_sg); |
6bfd44987 dma-debug: add ch... |
1371 1372 1373 1374 |
void debug_dma_alloc_coherent(struct device *dev, size_t size, dma_addr_t dma_addr, void *virt) { struct dma_debug_entry *entry; |
01ce18b31 dma-debug: introd... |
1375 |
if (unlikely(dma_debug_disabled())) |
6bfd44987 dma-debug: add ch... |
1376 1377 1378 1379 1380 1381 1382 1383 1384 1385 1386 |
return; if (unlikely(virt == NULL)) return; entry = dma_entry_alloc(); if (!entry) return; entry->type = dma_debug_coherent; entry->dev = dev; |
0abdd7a81 dma-debug: introd... |
1387 1388 |
entry->pfn = page_to_pfn(virt_to_page(virt)); entry->offset = (size_t) virt & PAGE_MASK; |
6bfd44987 dma-debug: add ch... |
1389 1390 1391 1392 1393 1394 1395 1396 1397 1398 1399 1400 1401 1402 |
entry->size = size; entry->dev_addr = dma_addr; entry->direction = DMA_BIDIRECTIONAL; add_dma_entry(entry); } EXPORT_SYMBOL(debug_dma_alloc_coherent); void debug_dma_free_coherent(struct device *dev, size_t size, void *virt, dma_addr_t addr) { struct dma_debug_entry ref = { .type = dma_debug_coherent, .dev = dev, |
0abdd7a81 dma-debug: introd... |
1403 1404 |
.pfn = page_to_pfn(virt_to_page(virt)), .offset = (size_t) virt & PAGE_MASK, |
6bfd44987 dma-debug: add ch... |
1405 1406 1407 1408 |
.dev_addr = addr, .size = size, .direction = DMA_BIDIRECTIONAL, }; |
01ce18b31 dma-debug: introd... |
1409 |
if (unlikely(dma_debug_disabled())) |
6bfd44987 dma-debug: add ch... |
1410 1411 1412 1413 1414 |
return; check_unmap(&ref); } EXPORT_SYMBOL(debug_dma_free_coherent); |
b9d2317e0 dma-debug: add ch... |
1415 1416 1417 |
void debug_dma_sync_single_for_cpu(struct device *dev, dma_addr_t dma_handle, size_t size, int direction) { |
aa010efb7 dma-debug: be mor... |
1418 |
struct dma_debug_entry ref; |
01ce18b31 dma-debug: introd... |
1419 |
if (unlikely(dma_debug_disabled())) |
b9d2317e0 dma-debug: add ch... |
1420 |
return; |
aa010efb7 dma-debug: be mor... |
1421 1422 1423 1424 1425 1426 1427 1428 |
ref.type = dma_debug_single; ref.dev = dev; ref.dev_addr = dma_handle; ref.size = size; ref.direction = direction; ref.sg_call_ents = 0; check_sync(dev, &ref, true); |
b9d2317e0 dma-debug: add ch... |
1429 1430 1431 1432 1433 1434 1435 |
} EXPORT_SYMBOL(debug_dma_sync_single_for_cpu); void debug_dma_sync_single_for_device(struct device *dev, dma_addr_t dma_handle, size_t size, int direction) { |
aa010efb7 dma-debug: be mor... |
1436 |
struct dma_debug_entry ref; |
01ce18b31 dma-debug: introd... |
1437 |
if (unlikely(dma_debug_disabled())) |
b9d2317e0 dma-debug: add ch... |
1438 |
return; |
aa010efb7 dma-debug: be mor... |
1439 1440 1441 1442 1443 1444 1445 1446 |
ref.type = dma_debug_single; ref.dev = dev; ref.dev_addr = dma_handle; ref.size = size; ref.direction = direction; ref.sg_call_ents = 0; check_sync(dev, &ref, false); |
b9d2317e0 dma-debug: add ch... |
1447 1448 |
} EXPORT_SYMBOL(debug_dma_sync_single_for_device); |
948408ba3 dma-debug: add ch... |
1449 1450 1451 1452 1453 |
void debug_dma_sync_single_range_for_cpu(struct device *dev, dma_addr_t dma_handle, unsigned long offset, size_t size, int direction) { |
aa010efb7 dma-debug: be mor... |
1454 |
struct dma_debug_entry ref; |
01ce18b31 dma-debug: introd... |
1455 |
if (unlikely(dma_debug_disabled())) |
948408ba3 dma-debug: add ch... |
1456 |
return; |
aa010efb7 dma-debug: be mor... |
1457 1458 1459 1460 1461 1462 1463 1464 |
ref.type = dma_debug_single; ref.dev = dev; ref.dev_addr = dma_handle; ref.size = offset + size; ref.direction = direction; ref.sg_call_ents = 0; check_sync(dev, &ref, true); |
948408ba3 dma-debug: add ch... |
1465 1466 1467 1468 1469 1470 1471 1472 |
} EXPORT_SYMBOL(debug_dma_sync_single_range_for_cpu); void debug_dma_sync_single_range_for_device(struct device *dev, dma_addr_t dma_handle, unsigned long offset, size_t size, int direction) { |
aa010efb7 dma-debug: be mor... |
1473 |
struct dma_debug_entry ref; |
01ce18b31 dma-debug: introd... |
1474 |
if (unlikely(dma_debug_disabled())) |
948408ba3 dma-debug: add ch... |
1475 |
return; |
aa010efb7 dma-debug: be mor... |
1476 1477 1478 1479 1480 1481 1482 1483 |
ref.type = dma_debug_single; ref.dev = dev; ref.dev_addr = dma_handle; ref.size = offset + size; ref.direction = direction; ref.sg_call_ents = 0; check_sync(dev, &ref, false); |
948408ba3 dma-debug: add ch... |
1484 1485 |
} EXPORT_SYMBOL(debug_dma_sync_single_range_for_device); |
a31fba5d6 dma-debug: add ch... |
1486 1487 1488 1489 |
void debug_dma_sync_sg_for_cpu(struct device *dev, struct scatterlist *sg, int nelems, int direction) { struct scatterlist *s; |
88f3907f6 dma-debug: fix de... |
1490 |
int mapped_ents = 0, i; |
a31fba5d6 dma-debug: add ch... |
1491 |
|
01ce18b31 dma-debug: introd... |
1492 |
if (unlikely(dma_debug_disabled())) |
a31fba5d6 dma-debug: add ch... |
1493 1494 1495 |
return; for_each_sg(sg, s, nelems, i) { |
aa010efb7 dma-debug: be mor... |
1496 1497 1498 1499 |
struct dma_debug_entry ref = { .type = dma_debug_sg, .dev = dev, |
0abdd7a81 dma-debug: introd... |
1500 1501 |
.pfn = page_to_pfn(sg_page(s)), .offset = s->offset, |
aa010efb7 dma-debug: be mor... |
1502 1503 1504 1505 1506 |
.dev_addr = sg_dma_address(s), .size = sg_dma_len(s), .direction = direction, .sg_call_ents = nelems, }; |
88f3907f6 dma-debug: fix de... |
1507 |
if (!i) |
aa010efb7 dma-debug: be mor... |
1508 |
mapped_ents = get_nr_mapped_entries(dev, &ref); |
88f3907f6 dma-debug: fix de... |
1509 1510 1511 |
if (i >= mapped_ents) break; |
aa010efb7 dma-debug: be mor... |
1512 |
check_sync(dev, &ref, true); |
a31fba5d6 dma-debug: add ch... |
1513 1514 1515 1516 1517 1518 1519 1520 |
} } EXPORT_SYMBOL(debug_dma_sync_sg_for_cpu); void debug_dma_sync_sg_for_device(struct device *dev, struct scatterlist *sg, int nelems, int direction) { struct scatterlist *s; |
88f3907f6 dma-debug: fix de... |
1521 |
int mapped_ents = 0, i; |
a31fba5d6 dma-debug: add ch... |
1522 |
|
01ce18b31 dma-debug: introd... |
1523 |
if (unlikely(dma_debug_disabled())) |
a31fba5d6 dma-debug: add ch... |
1524 1525 1526 |
return; for_each_sg(sg, s, nelems, i) { |
aa010efb7 dma-debug: be mor... |
1527 1528 1529 1530 |
struct dma_debug_entry ref = { .type = dma_debug_sg, .dev = dev, |
0abdd7a81 dma-debug: introd... |
1531 1532 |
.pfn = page_to_pfn(sg_page(s)), .offset = s->offset, |
aa010efb7 dma-debug: be mor... |
1533 1534 1535 1536 1537 |
.dev_addr = sg_dma_address(s), .size = sg_dma_len(s), .direction = direction, .sg_call_ents = nelems, }; |
88f3907f6 dma-debug: fix de... |
1538 |
if (!i) |
aa010efb7 dma-debug: be mor... |
1539 |
mapped_ents = get_nr_mapped_entries(dev, &ref); |
88f3907f6 dma-debug: fix de... |
1540 1541 1542 |
if (i >= mapped_ents) break; |
aa010efb7 dma-debug: be mor... |
1543 |
check_sync(dev, &ref, false); |
a31fba5d6 dma-debug: add ch... |
1544 1545 1546 |
} } EXPORT_SYMBOL(debug_dma_sync_sg_for_device); |
1745de5e5 dma-debug: add dm... |
1547 1548 1549 1550 1551 1552 1553 1554 1555 1556 1557 |
static int __init dma_debug_driver_setup(char *str) { int i; for (i = 0; i < NAME_MAX_LEN - 1; ++i, ++str) { current_driver_name[i] = *str; if (*str == 0) break; } if (current_driver_name[0]) |
e7ed70eed dma-debug: use pr... |
1558 1559 1560 |
pr_info("DMA-API: enable driver filter for driver [%s] ", current_driver_name); |
1745de5e5 dma-debug: add dm... |
1561 1562 1563 1564 1565 |
return 1; } __setup("dma_debug_driver=", dma_debug_driver_setup); |