Commit | Line | Data |
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f8de50eb | 1 | /* |
a15a519e | 2 | * Copyright © 2006-2009, Intel Corporation. |
f8de50eb | 3 | * |
a15a519e DW |
4 | * This program is free software; you can redistribute it and/or modify it |
5 | * under the terms and conditions of the GNU General Public License, | |
6 | * version 2, as published by the Free Software Foundation. | |
7 | * | |
8 | * This program is distributed in the hope it will be useful, but WITHOUT | |
9 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
10 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for | |
11 | * more details. | |
12 | * | |
13 | * You should have received a copy of the GNU General Public License along with | |
14 | * this program; if not, write to the Free Software Foundation, Inc., 59 Temple | |
15 | * Place - Suite 330, Boston, MA 02111-1307 USA. | |
f8de50eb | 16 | * |
98bcef56 | 17 | * Author: Anil S Keshavamurthy <anil.s.keshavamurthy@intel.com> |
f8de50eb KA |
18 | */ |
19 | ||
38717946 | 20 | #include <linux/iova.h> |
15bbdec3 | 21 | #include <linux/module.h> |
85b45456 | 22 | #include <linux/slab.h> |
9257b4a2 OP |
23 | #include <linux/smp.h> |
24 | #include <linux/bitops.h> | |
aaffaa8a | 25 | #include <linux/cpu.h> |
9257b4a2 OP |
26 | |
27 | static bool iova_rcache_insert(struct iova_domain *iovad, | |
28 | unsigned long pfn, | |
29 | unsigned long size); | |
30 | static unsigned long iova_rcache_get(struct iova_domain *iovad, | |
31 | unsigned long size, | |
32 | unsigned long limit_pfn); | |
33 | static void init_iova_rcaches(struct iova_domain *iovad); | |
34 | static void free_iova_rcaches(struct iova_domain *iovad); | |
19282101 | 35 | static void fq_destroy_all_entries(struct iova_domain *iovad); |
9a005a80 | 36 | static void fq_flush_timeout(unsigned long data); |
85b45456 | 37 | |
f8de50eb | 38 | void |
0fb5fe87 | 39 | init_iova_domain(struct iova_domain *iovad, unsigned long granule, |
aa3ac946 | 40 | unsigned long start_pfn) |
f8de50eb | 41 | { |
0fb5fe87 RM |
42 | /* |
43 | * IOVA granularity will normally be equal to the smallest | |
44 | * supported IOMMU page size; both *must* be capable of | |
45 | * representing individual CPU pages exactly. | |
46 | */ | |
47 | BUG_ON((granule > PAGE_SIZE) || !is_power_of_2(granule)); | |
48 | ||
f8de50eb KA |
49 | spin_lock_init(&iovad->iova_rbtree_lock); |
50 | iovad->rbroot = RB_ROOT; | |
e60aa7b5 | 51 | iovad->cached_node = NULL; |
f8de50eb | 52 | iovad->cached32_node = NULL; |
0fb5fe87 | 53 | iovad->granule = granule; |
1b722500 | 54 | iovad->start_pfn = start_pfn; |
aa3ac946 | 55 | iovad->dma_32bit_pfn = 1UL << (32 - iova_shift(iovad)); |
42f87e71 JR |
56 | iovad->flush_cb = NULL; |
57 | iovad->fq = NULL; | |
9257b4a2 | 58 | init_iova_rcaches(iovad); |
f8de50eb | 59 | } |
9b41760b | 60 | EXPORT_SYMBOL_GPL(init_iova_domain); |
f8de50eb | 61 | |
42f87e71 JR |
62 | static void free_iova_flush_queue(struct iova_domain *iovad) |
63 | { | |
64 | if (!iovad->fq) | |
65 | return; | |
66 | ||
9a005a80 JR |
67 | if (timer_pending(&iovad->fq_timer)) |
68 | del_timer(&iovad->fq_timer); | |
69 | ||
19282101 | 70 | fq_destroy_all_entries(iovad); |
9a005a80 | 71 | |
42f87e71 JR |
72 | free_percpu(iovad->fq); |
73 | ||
74 | iovad->fq = NULL; | |
75 | iovad->flush_cb = NULL; | |
76 | iovad->entry_dtor = NULL; | |
77 | } | |
78 | ||
79 | int init_iova_flush_queue(struct iova_domain *iovad, | |
80 | iova_flush_cb flush_cb, iova_entry_dtor entry_dtor) | |
81 | { | |
82 | int cpu; | |
83 | ||
fb418dab JR |
84 | atomic64_set(&iovad->fq_flush_start_cnt, 0); |
85 | atomic64_set(&iovad->fq_flush_finish_cnt, 0); | |
86 | ||
42f87e71 JR |
87 | iovad->fq = alloc_percpu(struct iova_fq); |
88 | if (!iovad->fq) | |
89 | return -ENOMEM; | |
90 | ||
91 | iovad->flush_cb = flush_cb; | |
92 | iovad->entry_dtor = entry_dtor; | |
93 | ||
94 | for_each_possible_cpu(cpu) { | |
95 | struct iova_fq *fq; | |
96 | ||
97 | fq = per_cpu_ptr(iovad->fq, cpu); | |
98 | fq->head = 0; | |
99 | fq->tail = 0; | |
8109c2a2 JR |
100 | |
101 | spin_lock_init(&fq->lock); | |
42f87e71 JR |
102 | } |
103 | ||
9a005a80 JR |
104 | setup_timer(&iovad->fq_timer, fq_flush_timeout, (unsigned long)iovad); |
105 | atomic_set(&iovad->fq_timer_on, 0); | |
106 | ||
42f87e71 JR |
107 | return 0; |
108 | } | |
109 | EXPORT_SYMBOL_GPL(init_iova_flush_queue); | |
110 | ||
f8de50eb KA |
111 | static struct rb_node * |
112 | __get_cached_rbnode(struct iova_domain *iovad, unsigned long *limit_pfn) | |
113 | { | |
e60aa7b5 RM |
114 | struct rb_node *cached_node = NULL; |
115 | struct iova *curr_iova; | |
116 | ||
117 | if (*limit_pfn <= iovad->dma_32bit_pfn) | |
118 | cached_node = iovad->cached32_node; | |
119 | if (!cached_node) | |
120 | cached_node = iovad->cached_node; | |
121 | if (!cached_node) | |
f8de50eb | 122 | return rb_last(&iovad->rbroot); |
e60aa7b5 RM |
123 | |
124 | curr_iova = rb_entry(cached_node, struct iova, node); | |
125 | *limit_pfn = min(*limit_pfn, curr_iova->pfn_lo); | |
126 | ||
127 | return rb_prev(cached_node); | |
f8de50eb KA |
128 | } |
129 | ||
130 | static void | |
e60aa7b5 | 131 | __cached_rbnode_insert_update(struct iova_domain *iovad, struct iova *new) |
f8de50eb | 132 | { |
e60aa7b5 RM |
133 | if (new->pfn_hi < iovad->dma_32bit_pfn) |
134 | iovad->cached32_node = &new->node; | |
135 | else | |
136 | iovad->cached_node = &new->node; | |
f8de50eb KA |
137 | } |
138 | ||
139 | static void | |
140 | __cached_rbnode_delete_update(struct iova_domain *iovad, struct iova *free) | |
141 | { | |
142 | struct iova *cached_iova; | |
f8de50eb | 143 | |
e60aa7b5 RM |
144 | cached_iova = rb_entry(iovad->cached32_node, struct iova, node); |
145 | if (free->pfn_hi < iovad->dma_32bit_pfn && | |
146 | iovad->cached32_node && free->pfn_lo >= cached_iova->pfn_lo) | |
147 | iovad->cached32_node = rb_next(&free->node); | |
148 | ||
149 | cached_iova = rb_entry(iovad->cached_node, struct iova, node); | |
150 | if (iovad->cached_node && free->pfn_lo >= cached_iova->pfn_lo) | |
151 | iovad->cached_node = rb_next(&free->node); | |
f8de50eb KA |
152 | } |
153 | ||
d751751a MS |
154 | /* Insert the iova into domain rbtree by holding writer lock */ |
155 | static void | |
156 | iova_insert_rbtree(struct rb_root *root, struct iova *iova, | |
157 | struct rb_node *start) | |
158 | { | |
159 | struct rb_node **new, *parent = NULL; | |
160 | ||
161 | new = (start) ? &start : &(root->rb_node); | |
162 | /* Figure out where to put new node */ | |
163 | while (*new) { | |
164 | struct iova *this = rb_entry(*new, struct iova, node); | |
165 | ||
166 | parent = *new; | |
167 | ||
168 | if (iova->pfn_lo < this->pfn_lo) | |
169 | new = &((*new)->rb_left); | |
170 | else if (iova->pfn_lo > this->pfn_lo) | |
171 | new = &((*new)->rb_right); | |
172 | else { | |
173 | WARN_ON(1); /* this should not happen */ | |
174 | return; | |
175 | } | |
176 | } | |
177 | /* Add new node and rebalance tree. */ | |
178 | rb_link_node(&iova->node, parent, new); | |
179 | rb_insert_color(&iova->node, root); | |
180 | } | |
181 | ||
ddf02886 | 182 | static int __alloc_and_insert_iova_range(struct iova_domain *iovad, |
183 | unsigned long size, unsigned long limit_pfn, | |
184 | struct iova *new, bool size_aligned) | |
f8de50eb | 185 | { |
ddf02886 | 186 | struct rb_node *prev, *curr = NULL; |
f8de50eb | 187 | unsigned long flags; |
e60aa7b5 | 188 | unsigned long new_pfn; |
086c83ac ZL |
189 | unsigned long align_mask = ~0UL; |
190 | ||
191 | if (size_aligned) | |
192 | align_mask <<= fls_long(size - 1); | |
f8de50eb KA |
193 | |
194 | /* Walk the tree backwards */ | |
195 | spin_lock_irqsave(&iovad->iova_rbtree_lock, flags); | |
f8de50eb | 196 | curr = __get_cached_rbnode(iovad, &limit_pfn); |
ddf02886 | 197 | prev = curr; |
f8de50eb | 198 | while (curr) { |
eba484b5 | 199 | struct iova *curr_iova = rb_entry(curr, struct iova, node); |
ddf02886 | 200 | |
086c83ac | 201 | if (limit_pfn <= curr_iova->pfn_lo) |
f8de50eb | 202 | goto move_left; |
086c83ac ZL |
203 | |
204 | if (((limit_pfn - size) & align_mask) > curr_iova->pfn_hi) | |
205 | break; /* found a free slot */ | |
206 | ||
757c370f | 207 | limit_pfn = curr_iova->pfn_lo; |
f8de50eb | 208 | move_left: |
ddf02886 | 209 | prev = curr; |
f8de50eb KA |
210 | curr = rb_prev(curr); |
211 | } | |
212 | ||
086c83ac ZL |
213 | new_pfn = (limit_pfn - size) & align_mask; |
214 | if (limit_pfn < size || new_pfn < iovad->start_pfn) { | |
215 | spin_unlock_irqrestore(&iovad->iova_rbtree_lock, flags); | |
216 | return -ENOMEM; | |
f8de50eb | 217 | } |
f76aec76 KA |
218 | |
219 | /* pfn_lo will point to size aligned address if size_aligned is set */ | |
086c83ac | 220 | new->pfn_lo = new_pfn; |
f76aec76 | 221 | new->pfn_hi = new->pfn_lo + size - 1; |
f8de50eb | 222 | |
d751751a MS |
223 | /* If we have 'prev', it's a valid place to start the insertion. */ |
224 | iova_insert_rbtree(&iovad->rbroot, new, prev); | |
e60aa7b5 | 225 | __cached_rbnode_insert_update(iovad, new); |
ddf02886 | 226 | |
f8de50eb | 227 | spin_unlock_irqrestore(&iovad->iova_rbtree_lock, flags); |
ddf02886 | 228 | |
229 | ||
f8de50eb KA |
230 | return 0; |
231 | } | |
232 | ||
ae1ff3d6 SA |
233 | static struct kmem_cache *iova_cache; |
234 | static unsigned int iova_cache_users; | |
235 | static DEFINE_MUTEX(iova_cache_mutex); | |
236 | ||
237 | struct iova *alloc_iova_mem(void) | |
238 | { | |
239 | return kmem_cache_alloc(iova_cache, GFP_ATOMIC); | |
240 | } | |
241 | EXPORT_SYMBOL(alloc_iova_mem); | |
242 | ||
243 | void free_iova_mem(struct iova *iova) | |
244 | { | |
245 | kmem_cache_free(iova_cache, iova); | |
246 | } | |
247 | EXPORT_SYMBOL(free_iova_mem); | |
248 | ||
249 | int iova_cache_get(void) | |
250 | { | |
251 | mutex_lock(&iova_cache_mutex); | |
252 | if (!iova_cache_users) { | |
253 | iova_cache = kmem_cache_create( | |
254 | "iommu_iova", sizeof(struct iova), 0, | |
255 | SLAB_HWCACHE_ALIGN, NULL); | |
256 | if (!iova_cache) { | |
257 | mutex_unlock(&iova_cache_mutex); | |
258 | printk(KERN_ERR "Couldn't create iova cache\n"); | |
259 | return -ENOMEM; | |
260 | } | |
261 | } | |
262 | ||
263 | iova_cache_users++; | |
264 | mutex_unlock(&iova_cache_mutex); | |
265 | ||
266 | return 0; | |
267 | } | |
9b41760b | 268 | EXPORT_SYMBOL_GPL(iova_cache_get); |
ae1ff3d6 SA |
269 | |
270 | void iova_cache_put(void) | |
271 | { | |
272 | mutex_lock(&iova_cache_mutex); | |
273 | if (WARN_ON(!iova_cache_users)) { | |
274 | mutex_unlock(&iova_cache_mutex); | |
275 | return; | |
276 | } | |
277 | iova_cache_users--; | |
278 | if (!iova_cache_users) | |
279 | kmem_cache_destroy(iova_cache); | |
280 | mutex_unlock(&iova_cache_mutex); | |
281 | } | |
9b41760b | 282 | EXPORT_SYMBOL_GPL(iova_cache_put); |
ae1ff3d6 | 283 | |
f8de50eb KA |
284 | /** |
285 | * alloc_iova - allocates an iova | |
07db0409 MI |
286 | * @iovad: - iova domain in question |
287 | * @size: - size of page frames to allocate | |
288 | * @limit_pfn: - max limit address | |
289 | * @size_aligned: - set if size_aligned address range is required | |
1b722500 RM |
290 | * This function allocates an iova in the range iovad->start_pfn to limit_pfn, |
291 | * searching top-down from limit_pfn to iovad->start_pfn. If the size_aligned | |
f76aec76 KA |
292 | * flag is set then the allocated address iova->pfn_lo will be naturally |
293 | * aligned on roundup_power_of_two(size). | |
f8de50eb KA |
294 | */ |
295 | struct iova * | |
296 | alloc_iova(struct iova_domain *iovad, unsigned long size, | |
f76aec76 KA |
297 | unsigned long limit_pfn, |
298 | bool size_aligned) | |
f8de50eb | 299 | { |
f8de50eb KA |
300 | struct iova *new_iova; |
301 | int ret; | |
302 | ||
303 | new_iova = alloc_iova_mem(); | |
304 | if (!new_iova) | |
305 | return NULL; | |
306 | ||
757c370f | 307 | ret = __alloc_and_insert_iova_range(iovad, size, limit_pfn + 1, |
ddf02886 | 308 | new_iova, size_aligned); |
f8de50eb KA |
309 | |
310 | if (ret) { | |
f8de50eb KA |
311 | free_iova_mem(new_iova); |
312 | return NULL; | |
313 | } | |
314 | ||
f8de50eb KA |
315 | return new_iova; |
316 | } | |
9b41760b | 317 | EXPORT_SYMBOL_GPL(alloc_iova); |
f8de50eb | 318 | |
9257b4a2 OP |
319 | static struct iova * |
320 | private_find_iova(struct iova_domain *iovad, unsigned long pfn) | |
f8de50eb | 321 | { |
9257b4a2 OP |
322 | struct rb_node *node = iovad->rbroot.rb_node; |
323 | ||
324 | assert_spin_locked(&iovad->iova_rbtree_lock); | |
f8de50eb | 325 | |
f8de50eb | 326 | while (node) { |
eba484b5 | 327 | struct iova *iova = rb_entry(node, struct iova, node); |
f8de50eb | 328 | |
f8de50eb KA |
329 | if (pfn < iova->pfn_lo) |
330 | node = node->rb_left; | |
2070f940 | 331 | else if (pfn > iova->pfn_hi) |
f8de50eb | 332 | node = node->rb_right; |
2070f940 ZL |
333 | else |
334 | return iova; /* pfn falls within iova's range */ | |
f8de50eb KA |
335 | } |
336 | ||
f8de50eb KA |
337 | return NULL; |
338 | } | |
9257b4a2 OP |
339 | |
340 | static void private_free_iova(struct iova_domain *iovad, struct iova *iova) | |
341 | { | |
342 | assert_spin_locked(&iovad->iova_rbtree_lock); | |
343 | __cached_rbnode_delete_update(iovad, iova); | |
344 | rb_erase(&iova->node, &iovad->rbroot); | |
345 | free_iova_mem(iova); | |
346 | } | |
347 | ||
348 | /** | |
349 | * find_iova - finds an iova for a given pfn | |
350 | * @iovad: - iova domain in question. | |
351 | * @pfn: - page frame number | |
352 | * This function finds and returns an iova belonging to the | |
353 | * given doamin which matches the given pfn. | |
354 | */ | |
355 | struct iova *find_iova(struct iova_domain *iovad, unsigned long pfn) | |
356 | { | |
357 | unsigned long flags; | |
358 | struct iova *iova; | |
359 | ||
360 | /* Take the lock so that no other thread is manipulating the rbtree */ | |
361 | spin_lock_irqsave(&iovad->iova_rbtree_lock, flags); | |
362 | iova = private_find_iova(iovad, pfn); | |
363 | spin_unlock_irqrestore(&iovad->iova_rbtree_lock, flags); | |
364 | return iova; | |
365 | } | |
9b41760b | 366 | EXPORT_SYMBOL_GPL(find_iova); |
f8de50eb KA |
367 | |
368 | /** | |
369 | * __free_iova - frees the given iova | |
370 | * @iovad: iova domain in question. | |
371 | * @iova: iova in question. | |
372 | * Frees the given iova belonging to the giving domain | |
373 | */ | |
374 | void | |
375 | __free_iova(struct iova_domain *iovad, struct iova *iova) | |
376 | { | |
377 | unsigned long flags; | |
378 | ||
379 | spin_lock_irqsave(&iovad->iova_rbtree_lock, flags); | |
9257b4a2 | 380 | private_free_iova(iovad, iova); |
f8de50eb | 381 | spin_unlock_irqrestore(&iovad->iova_rbtree_lock, flags); |
f8de50eb | 382 | } |
9b41760b | 383 | EXPORT_SYMBOL_GPL(__free_iova); |
f8de50eb KA |
384 | |
385 | /** | |
386 | * free_iova - finds and frees the iova for a given pfn | |
387 | * @iovad: - iova domain in question. | |
388 | * @pfn: - pfn that is allocated previously | |
389 | * This functions finds an iova for a given pfn and then | |
390 | * frees the iova from that domain. | |
391 | */ | |
392 | void | |
393 | free_iova(struct iova_domain *iovad, unsigned long pfn) | |
394 | { | |
395 | struct iova *iova = find_iova(iovad, pfn); | |
733cac2a | 396 | |
f8de50eb KA |
397 | if (iova) |
398 | __free_iova(iovad, iova); | |
399 | ||
400 | } | |
9b41760b | 401 | EXPORT_SYMBOL_GPL(free_iova); |
f8de50eb | 402 | |
9257b4a2 OP |
403 | /** |
404 | * alloc_iova_fast - allocates an iova from rcache | |
405 | * @iovad: - iova domain in question | |
406 | * @size: - size of page frames to allocate | |
407 | * @limit_pfn: - max limit address | |
408 | * This function tries to satisfy an iova allocation from the rcache, | |
409 | * and falls back to regular allocation on failure. | |
410 | */ | |
411 | unsigned long | |
412 | alloc_iova_fast(struct iova_domain *iovad, unsigned long size, | |
413 | unsigned long limit_pfn) | |
414 | { | |
415 | bool flushed_rcache = false; | |
416 | unsigned long iova_pfn; | |
417 | struct iova *new_iova; | |
418 | ||
419 | iova_pfn = iova_rcache_get(iovad, size, limit_pfn); | |
420 | if (iova_pfn) | |
421 | return iova_pfn; | |
422 | ||
423 | retry: | |
424 | new_iova = alloc_iova(iovad, size, limit_pfn, true); | |
425 | if (!new_iova) { | |
426 | unsigned int cpu; | |
427 | ||
428 | if (flushed_rcache) | |
429 | return 0; | |
430 | ||
431 | /* Try replenishing IOVAs by flushing rcache. */ | |
432 | flushed_rcache = true; | |
433 | for_each_online_cpu(cpu) | |
434 | free_cpu_cached_iovas(cpu, iovad); | |
435 | goto retry; | |
436 | } | |
437 | ||
438 | return new_iova->pfn_lo; | |
439 | } | |
440 | EXPORT_SYMBOL_GPL(alloc_iova_fast); | |
441 | ||
442 | /** | |
443 | * free_iova_fast - free iova pfn range into rcache | |
444 | * @iovad: - iova domain in question. | |
445 | * @pfn: - pfn that is allocated previously | |
446 | * @size: - # of pages in range | |
447 | * This functions frees an iova range by trying to put it into the rcache, | |
448 | * falling back to regular iova deallocation via free_iova() if this fails. | |
449 | */ | |
450 | void | |
451 | free_iova_fast(struct iova_domain *iovad, unsigned long pfn, unsigned long size) | |
452 | { | |
453 | if (iova_rcache_insert(iovad, pfn, size)) | |
454 | return; | |
455 | ||
456 | free_iova(iovad, pfn); | |
457 | } | |
458 | EXPORT_SYMBOL_GPL(free_iova_fast); | |
459 | ||
19282101 JR |
460 | #define fq_ring_for_each(i, fq) \ |
461 | for ((i) = (fq)->head; (i) != (fq)->tail; (i) = ((i) + 1) % IOVA_FQ_SIZE) | |
462 | ||
463 | static inline bool fq_full(struct iova_fq *fq) | |
464 | { | |
8109c2a2 | 465 | assert_spin_locked(&fq->lock); |
19282101 JR |
466 | return (((fq->tail + 1) % IOVA_FQ_SIZE) == fq->head); |
467 | } | |
468 | ||
469 | static inline unsigned fq_ring_add(struct iova_fq *fq) | |
470 | { | |
471 | unsigned idx = fq->tail; | |
472 | ||
8109c2a2 JR |
473 | assert_spin_locked(&fq->lock); |
474 | ||
19282101 JR |
475 | fq->tail = (idx + 1) % IOVA_FQ_SIZE; |
476 | ||
477 | return idx; | |
478 | } | |
479 | ||
480 | static void fq_ring_free(struct iova_domain *iovad, struct iova_fq *fq) | |
481 | { | |
fb418dab | 482 | u64 counter = atomic64_read(&iovad->fq_flush_finish_cnt); |
19282101 JR |
483 | unsigned idx; |
484 | ||
8109c2a2 JR |
485 | assert_spin_locked(&fq->lock); |
486 | ||
19282101 JR |
487 | fq_ring_for_each(idx, fq) { |
488 | ||
fb418dab JR |
489 | if (fq->entries[idx].counter >= counter) |
490 | break; | |
491 | ||
19282101 JR |
492 | if (iovad->entry_dtor) |
493 | iovad->entry_dtor(fq->entries[idx].data); | |
494 | ||
495 | free_iova_fast(iovad, | |
496 | fq->entries[idx].iova_pfn, | |
497 | fq->entries[idx].pages); | |
fb418dab JR |
498 | |
499 | fq->head = (fq->head + 1) % IOVA_FQ_SIZE; | |
19282101 | 500 | } |
fb418dab | 501 | } |
19282101 | 502 | |
fb418dab JR |
503 | static void iova_domain_flush(struct iova_domain *iovad) |
504 | { | |
505 | atomic64_inc(&iovad->fq_flush_start_cnt); | |
506 | iovad->flush_cb(iovad); | |
507 | atomic64_inc(&iovad->fq_flush_finish_cnt); | |
19282101 JR |
508 | } |
509 | ||
510 | static void fq_destroy_all_entries(struct iova_domain *iovad) | |
511 | { | |
512 | int cpu; | |
513 | ||
514 | /* | |
515 | * This code runs when the iova_domain is being detroyed, so don't | |
516 | * bother to free iovas, just call the entry_dtor on all remaining | |
517 | * entries. | |
518 | */ | |
519 | if (!iovad->entry_dtor) | |
520 | return; | |
521 | ||
522 | for_each_possible_cpu(cpu) { | |
523 | struct iova_fq *fq = per_cpu_ptr(iovad->fq, cpu); | |
524 | int idx; | |
525 | ||
526 | fq_ring_for_each(idx, fq) | |
527 | iovad->entry_dtor(fq->entries[idx].data); | |
528 | } | |
529 | } | |
530 | ||
9a005a80 JR |
531 | static void fq_flush_timeout(unsigned long data) |
532 | { | |
533 | struct iova_domain *iovad = (struct iova_domain *)data; | |
534 | int cpu; | |
535 | ||
536 | atomic_set(&iovad->fq_timer_on, 0); | |
537 | iova_domain_flush(iovad); | |
538 | ||
539 | for_each_possible_cpu(cpu) { | |
540 | unsigned long flags; | |
541 | struct iova_fq *fq; | |
542 | ||
543 | fq = per_cpu_ptr(iovad->fq, cpu); | |
544 | spin_lock_irqsave(&fq->lock, flags); | |
545 | fq_ring_free(iovad, fq); | |
546 | spin_unlock_irqrestore(&fq->lock, flags); | |
547 | } | |
548 | } | |
549 | ||
19282101 JR |
550 | void queue_iova(struct iova_domain *iovad, |
551 | unsigned long pfn, unsigned long pages, | |
552 | unsigned long data) | |
553 | { | |
554 | struct iova_fq *fq = get_cpu_ptr(iovad->fq); | |
8109c2a2 | 555 | unsigned long flags; |
19282101 JR |
556 | unsigned idx; |
557 | ||
8109c2a2 JR |
558 | spin_lock_irqsave(&fq->lock, flags); |
559 | ||
fb418dab JR |
560 | /* |
561 | * First remove all entries from the flush queue that have already been | |
562 | * flushed out on another CPU. This makes the fq_full() check below less | |
563 | * likely to be true. | |
564 | */ | |
565 | fq_ring_free(iovad, fq); | |
566 | ||
19282101 | 567 | if (fq_full(fq)) { |
fb418dab | 568 | iova_domain_flush(iovad); |
19282101 JR |
569 | fq_ring_free(iovad, fq); |
570 | } | |
571 | ||
572 | idx = fq_ring_add(fq); | |
573 | ||
574 | fq->entries[idx].iova_pfn = pfn; | |
575 | fq->entries[idx].pages = pages; | |
576 | fq->entries[idx].data = data; | |
fb418dab | 577 | fq->entries[idx].counter = atomic64_read(&iovad->fq_flush_start_cnt); |
19282101 | 578 | |
8109c2a2 | 579 | spin_unlock_irqrestore(&fq->lock, flags); |
9a005a80 JR |
580 | |
581 | if (atomic_cmpxchg(&iovad->fq_timer_on, 0, 1) == 0) | |
582 | mod_timer(&iovad->fq_timer, | |
583 | jiffies + msecs_to_jiffies(IOVA_FQ_TIMEOUT)); | |
584 | ||
19282101 JR |
585 | put_cpu_ptr(iovad->fq); |
586 | } | |
587 | EXPORT_SYMBOL_GPL(queue_iova); | |
588 | ||
f8de50eb KA |
589 | /** |
590 | * put_iova_domain - destroys the iova doamin | |
591 | * @iovad: - iova domain in question. | |
592 | * All the iova's in that domain are destroyed. | |
593 | */ | |
594 | void put_iova_domain(struct iova_domain *iovad) | |
595 | { | |
596 | struct rb_node *node; | |
597 | unsigned long flags; | |
598 | ||
42f87e71 | 599 | free_iova_flush_queue(iovad); |
9257b4a2 | 600 | free_iova_rcaches(iovad); |
f8de50eb KA |
601 | spin_lock_irqsave(&iovad->iova_rbtree_lock, flags); |
602 | node = rb_first(&iovad->rbroot); | |
603 | while (node) { | |
eba484b5 | 604 | struct iova *iova = rb_entry(node, struct iova, node); |
733cac2a | 605 | |
f8de50eb KA |
606 | rb_erase(node, &iovad->rbroot); |
607 | free_iova_mem(iova); | |
608 | node = rb_first(&iovad->rbroot); | |
609 | } | |
610 | spin_unlock_irqrestore(&iovad->iova_rbtree_lock, flags); | |
611 | } | |
9b41760b | 612 | EXPORT_SYMBOL_GPL(put_iova_domain); |
f8de50eb KA |
613 | |
614 | static int | |
615 | __is_range_overlap(struct rb_node *node, | |
616 | unsigned long pfn_lo, unsigned long pfn_hi) | |
617 | { | |
eba484b5 | 618 | struct iova *iova = rb_entry(node, struct iova, node); |
f8de50eb KA |
619 | |
620 | if ((pfn_lo <= iova->pfn_hi) && (pfn_hi >= iova->pfn_lo)) | |
621 | return 1; | |
622 | return 0; | |
623 | } | |
624 | ||
75f05569 JL |
625 | static inline struct iova * |
626 | alloc_and_init_iova(unsigned long pfn_lo, unsigned long pfn_hi) | |
627 | { | |
628 | struct iova *iova; | |
629 | ||
630 | iova = alloc_iova_mem(); | |
631 | if (iova) { | |
632 | iova->pfn_lo = pfn_lo; | |
633 | iova->pfn_hi = pfn_hi; | |
634 | } | |
635 | ||
636 | return iova; | |
637 | } | |
638 | ||
f8de50eb KA |
639 | static struct iova * |
640 | __insert_new_range(struct iova_domain *iovad, | |
641 | unsigned long pfn_lo, unsigned long pfn_hi) | |
642 | { | |
643 | struct iova *iova; | |
644 | ||
75f05569 JL |
645 | iova = alloc_and_init_iova(pfn_lo, pfn_hi); |
646 | if (iova) | |
d751751a | 647 | iova_insert_rbtree(&iovad->rbroot, iova, NULL); |
f8de50eb | 648 | |
f8de50eb KA |
649 | return iova; |
650 | } | |
651 | ||
652 | static void | |
653 | __adjust_overlap_range(struct iova *iova, | |
654 | unsigned long *pfn_lo, unsigned long *pfn_hi) | |
655 | { | |
656 | if (*pfn_lo < iova->pfn_lo) | |
657 | iova->pfn_lo = *pfn_lo; | |
658 | if (*pfn_hi > iova->pfn_hi) | |
659 | *pfn_lo = iova->pfn_hi + 1; | |
660 | } | |
661 | ||
662 | /** | |
663 | * reserve_iova - reserves an iova in the given range | |
664 | * @iovad: - iova domain pointer | |
665 | * @pfn_lo: - lower page frame address | |
666 | * @pfn_hi:- higher pfn adderss | |
667 | * This function allocates reserves the address range from pfn_lo to pfn_hi so | |
668 | * that this address is not dished out as part of alloc_iova. | |
669 | */ | |
670 | struct iova * | |
671 | reserve_iova(struct iova_domain *iovad, | |
672 | unsigned long pfn_lo, unsigned long pfn_hi) | |
673 | { | |
674 | struct rb_node *node; | |
675 | unsigned long flags; | |
676 | struct iova *iova; | |
677 | unsigned int overlap = 0; | |
678 | ||
3d39cecc | 679 | spin_lock_irqsave(&iovad->iova_rbtree_lock, flags); |
f8de50eb KA |
680 | for (node = rb_first(&iovad->rbroot); node; node = rb_next(node)) { |
681 | if (__is_range_overlap(node, pfn_lo, pfn_hi)) { | |
eba484b5 | 682 | iova = rb_entry(node, struct iova, node); |
f8de50eb KA |
683 | __adjust_overlap_range(iova, &pfn_lo, &pfn_hi); |
684 | if ((pfn_lo >= iova->pfn_lo) && | |
685 | (pfn_hi <= iova->pfn_hi)) | |
686 | goto finish; | |
687 | overlap = 1; | |
688 | ||
689 | } else if (overlap) | |
690 | break; | |
691 | } | |
692 | ||
25985edc | 693 | /* We are here either because this is the first reserver node |
f8de50eb KA |
694 | * or need to insert remaining non overlap addr range |
695 | */ | |
696 | iova = __insert_new_range(iovad, pfn_lo, pfn_hi); | |
697 | finish: | |
698 | ||
3d39cecc | 699 | spin_unlock_irqrestore(&iovad->iova_rbtree_lock, flags); |
f8de50eb KA |
700 | return iova; |
701 | } | |
9b41760b | 702 | EXPORT_SYMBOL_GPL(reserve_iova); |
f8de50eb KA |
703 | |
704 | /** | |
705 | * copy_reserved_iova - copies the reserved between domains | |
706 | * @from: - source doamin from where to copy | |
707 | * @to: - destination domin where to copy | |
708 | * This function copies reserved iova's from one doamin to | |
709 | * other. | |
710 | */ | |
711 | void | |
712 | copy_reserved_iova(struct iova_domain *from, struct iova_domain *to) | |
713 | { | |
714 | unsigned long flags; | |
715 | struct rb_node *node; | |
716 | ||
3d39cecc | 717 | spin_lock_irqsave(&from->iova_rbtree_lock, flags); |
f8de50eb | 718 | for (node = rb_first(&from->rbroot); node; node = rb_next(node)) { |
eba484b5 | 719 | struct iova *iova = rb_entry(node, struct iova, node); |
f8de50eb | 720 | struct iova *new_iova; |
733cac2a | 721 | |
f8de50eb KA |
722 | new_iova = reserve_iova(to, iova->pfn_lo, iova->pfn_hi); |
723 | if (!new_iova) | |
724 | printk(KERN_ERR "Reserve iova range %lx@%lx failed\n", | |
725 | iova->pfn_lo, iova->pfn_lo); | |
726 | } | |
3d39cecc | 727 | spin_unlock_irqrestore(&from->iova_rbtree_lock, flags); |
f8de50eb | 728 | } |
9b41760b | 729 | EXPORT_SYMBOL_GPL(copy_reserved_iova); |
75f05569 JL |
730 | |
731 | struct iova * | |
732 | split_and_remove_iova(struct iova_domain *iovad, struct iova *iova, | |
733 | unsigned long pfn_lo, unsigned long pfn_hi) | |
734 | { | |
735 | unsigned long flags; | |
736 | struct iova *prev = NULL, *next = NULL; | |
737 | ||
738 | spin_lock_irqsave(&iovad->iova_rbtree_lock, flags); | |
739 | if (iova->pfn_lo < pfn_lo) { | |
740 | prev = alloc_and_init_iova(iova->pfn_lo, pfn_lo - 1); | |
741 | if (prev == NULL) | |
742 | goto error; | |
743 | } | |
744 | if (iova->pfn_hi > pfn_hi) { | |
745 | next = alloc_and_init_iova(pfn_hi + 1, iova->pfn_hi); | |
746 | if (next == NULL) | |
747 | goto error; | |
748 | } | |
749 | ||
750 | __cached_rbnode_delete_update(iovad, iova); | |
751 | rb_erase(&iova->node, &iovad->rbroot); | |
752 | ||
753 | if (prev) { | |
d751751a | 754 | iova_insert_rbtree(&iovad->rbroot, prev, NULL); |
75f05569 JL |
755 | iova->pfn_lo = pfn_lo; |
756 | } | |
757 | if (next) { | |
d751751a | 758 | iova_insert_rbtree(&iovad->rbroot, next, NULL); |
75f05569 JL |
759 | iova->pfn_hi = pfn_hi; |
760 | } | |
761 | spin_unlock_irqrestore(&iovad->iova_rbtree_lock, flags); | |
762 | ||
763 | return iova; | |
764 | ||
765 | error: | |
766 | spin_unlock_irqrestore(&iovad->iova_rbtree_lock, flags); | |
767 | if (prev) | |
768 | free_iova_mem(prev); | |
769 | return NULL; | |
770 | } | |
15bbdec3 | 771 | |
9257b4a2 OP |
772 | /* |
773 | * Magazine caches for IOVA ranges. For an introduction to magazines, | |
774 | * see the USENIX 2001 paper "Magazines and Vmem: Extending the Slab | |
775 | * Allocator to Many CPUs and Arbitrary Resources" by Bonwick and Adams. | |
776 | * For simplicity, we use a static magazine size and don't implement the | |
777 | * dynamic size tuning described in the paper. | |
778 | */ | |
779 | ||
780 | #define IOVA_MAG_SIZE 128 | |
781 | ||
782 | struct iova_magazine { | |
783 | unsigned long size; | |
784 | unsigned long pfns[IOVA_MAG_SIZE]; | |
785 | }; | |
786 | ||
787 | struct iova_cpu_rcache { | |
788 | spinlock_t lock; | |
789 | struct iova_magazine *loaded; | |
790 | struct iova_magazine *prev; | |
791 | }; | |
792 | ||
793 | static struct iova_magazine *iova_magazine_alloc(gfp_t flags) | |
794 | { | |
795 | return kzalloc(sizeof(struct iova_magazine), flags); | |
796 | } | |
797 | ||
798 | static void iova_magazine_free(struct iova_magazine *mag) | |
799 | { | |
800 | kfree(mag); | |
801 | } | |
802 | ||
803 | static void | |
804 | iova_magazine_free_pfns(struct iova_magazine *mag, struct iova_domain *iovad) | |
805 | { | |
806 | unsigned long flags; | |
807 | int i; | |
808 | ||
809 | if (!mag) | |
810 | return; | |
811 | ||
812 | spin_lock_irqsave(&iovad->iova_rbtree_lock, flags); | |
813 | ||
814 | for (i = 0 ; i < mag->size; ++i) { | |
815 | struct iova *iova = private_find_iova(iovad, mag->pfns[i]); | |
816 | ||
817 | BUG_ON(!iova); | |
818 | private_free_iova(iovad, iova); | |
819 | } | |
820 | ||
821 | spin_unlock_irqrestore(&iovad->iova_rbtree_lock, flags); | |
822 | ||
823 | mag->size = 0; | |
824 | } | |
825 | ||
826 | static bool iova_magazine_full(struct iova_magazine *mag) | |
827 | { | |
828 | return (mag && mag->size == IOVA_MAG_SIZE); | |
829 | } | |
830 | ||
831 | static bool iova_magazine_empty(struct iova_magazine *mag) | |
832 | { | |
833 | return (!mag || mag->size == 0); | |
834 | } | |
835 | ||
836 | static unsigned long iova_magazine_pop(struct iova_magazine *mag, | |
837 | unsigned long limit_pfn) | |
838 | { | |
839 | BUG_ON(iova_magazine_empty(mag)); | |
840 | ||
841 | if (mag->pfns[mag->size - 1] >= limit_pfn) | |
842 | return 0; | |
843 | ||
844 | return mag->pfns[--mag->size]; | |
845 | } | |
846 | ||
847 | static void iova_magazine_push(struct iova_magazine *mag, unsigned long pfn) | |
848 | { | |
849 | BUG_ON(iova_magazine_full(mag)); | |
850 | ||
851 | mag->pfns[mag->size++] = pfn; | |
852 | } | |
853 | ||
854 | static void init_iova_rcaches(struct iova_domain *iovad) | |
855 | { | |
856 | struct iova_cpu_rcache *cpu_rcache; | |
857 | struct iova_rcache *rcache; | |
858 | unsigned int cpu; | |
859 | int i; | |
860 | ||
861 | for (i = 0; i < IOVA_RANGE_CACHE_MAX_SIZE; ++i) { | |
862 | rcache = &iovad->rcaches[i]; | |
863 | spin_lock_init(&rcache->lock); | |
864 | rcache->depot_size = 0; | |
865 | rcache->cpu_rcaches = __alloc_percpu(sizeof(*cpu_rcache), cache_line_size()); | |
866 | if (WARN_ON(!rcache->cpu_rcaches)) | |
867 | continue; | |
868 | for_each_possible_cpu(cpu) { | |
869 | cpu_rcache = per_cpu_ptr(rcache->cpu_rcaches, cpu); | |
870 | spin_lock_init(&cpu_rcache->lock); | |
871 | cpu_rcache->loaded = iova_magazine_alloc(GFP_KERNEL); | |
872 | cpu_rcache->prev = iova_magazine_alloc(GFP_KERNEL); | |
873 | } | |
874 | } | |
875 | } | |
876 | ||
877 | /* | |
878 | * Try inserting IOVA range starting with 'iova_pfn' into 'rcache', and | |
879 | * return true on success. Can fail if rcache is full and we can't free | |
880 | * space, and free_iova() (our only caller) will then return the IOVA | |
881 | * range to the rbtree instead. | |
882 | */ | |
883 | static bool __iova_rcache_insert(struct iova_domain *iovad, | |
884 | struct iova_rcache *rcache, | |
885 | unsigned long iova_pfn) | |
886 | { | |
887 | struct iova_magazine *mag_to_free = NULL; | |
888 | struct iova_cpu_rcache *cpu_rcache; | |
889 | bool can_insert = false; | |
890 | unsigned long flags; | |
891 | ||
aaffaa8a | 892 | cpu_rcache = raw_cpu_ptr(rcache->cpu_rcaches); |
9257b4a2 OP |
893 | spin_lock_irqsave(&cpu_rcache->lock, flags); |
894 | ||
895 | if (!iova_magazine_full(cpu_rcache->loaded)) { | |
896 | can_insert = true; | |
897 | } else if (!iova_magazine_full(cpu_rcache->prev)) { | |
898 | swap(cpu_rcache->prev, cpu_rcache->loaded); | |
899 | can_insert = true; | |
900 | } else { | |
901 | struct iova_magazine *new_mag = iova_magazine_alloc(GFP_ATOMIC); | |
902 | ||
903 | if (new_mag) { | |
904 | spin_lock(&rcache->lock); | |
905 | if (rcache->depot_size < MAX_GLOBAL_MAGS) { | |
906 | rcache->depot[rcache->depot_size++] = | |
907 | cpu_rcache->loaded; | |
908 | } else { | |
909 | mag_to_free = cpu_rcache->loaded; | |
910 | } | |
911 | spin_unlock(&rcache->lock); | |
912 | ||
913 | cpu_rcache->loaded = new_mag; | |
914 | can_insert = true; | |
915 | } | |
916 | } | |
917 | ||
918 | if (can_insert) | |
919 | iova_magazine_push(cpu_rcache->loaded, iova_pfn); | |
920 | ||
921 | spin_unlock_irqrestore(&cpu_rcache->lock, flags); | |
922 | ||
923 | if (mag_to_free) { | |
924 | iova_magazine_free_pfns(mag_to_free, iovad); | |
925 | iova_magazine_free(mag_to_free); | |
926 | } | |
927 | ||
928 | return can_insert; | |
929 | } | |
930 | ||
931 | static bool iova_rcache_insert(struct iova_domain *iovad, unsigned long pfn, | |
932 | unsigned long size) | |
933 | { | |
934 | unsigned int log_size = order_base_2(size); | |
935 | ||
936 | if (log_size >= IOVA_RANGE_CACHE_MAX_SIZE) | |
937 | return false; | |
938 | ||
939 | return __iova_rcache_insert(iovad, &iovad->rcaches[log_size], pfn); | |
940 | } | |
941 | ||
942 | /* | |
943 | * Caller wants to allocate a new IOVA range from 'rcache'. If we can | |
944 | * satisfy the request, return a matching non-NULL range and remove | |
945 | * it from the 'rcache'. | |
946 | */ | |
947 | static unsigned long __iova_rcache_get(struct iova_rcache *rcache, | |
948 | unsigned long limit_pfn) | |
949 | { | |
950 | struct iova_cpu_rcache *cpu_rcache; | |
951 | unsigned long iova_pfn = 0; | |
952 | bool has_pfn = false; | |
953 | unsigned long flags; | |
954 | ||
aaffaa8a | 955 | cpu_rcache = raw_cpu_ptr(rcache->cpu_rcaches); |
9257b4a2 OP |
956 | spin_lock_irqsave(&cpu_rcache->lock, flags); |
957 | ||
958 | if (!iova_magazine_empty(cpu_rcache->loaded)) { | |
959 | has_pfn = true; | |
960 | } else if (!iova_magazine_empty(cpu_rcache->prev)) { | |
961 | swap(cpu_rcache->prev, cpu_rcache->loaded); | |
962 | has_pfn = true; | |
963 | } else { | |
964 | spin_lock(&rcache->lock); | |
965 | if (rcache->depot_size > 0) { | |
966 | iova_magazine_free(cpu_rcache->loaded); | |
967 | cpu_rcache->loaded = rcache->depot[--rcache->depot_size]; | |
968 | has_pfn = true; | |
969 | } | |
970 | spin_unlock(&rcache->lock); | |
971 | } | |
972 | ||
973 | if (has_pfn) | |
974 | iova_pfn = iova_magazine_pop(cpu_rcache->loaded, limit_pfn); | |
975 | ||
976 | spin_unlock_irqrestore(&cpu_rcache->lock, flags); | |
977 | ||
978 | return iova_pfn; | |
979 | } | |
980 | ||
981 | /* | |
982 | * Try to satisfy IOVA allocation range from rcache. Fail if requested | |
983 | * size is too big or the DMA limit we are given isn't satisfied by the | |
984 | * top element in the magazine. | |
985 | */ | |
986 | static unsigned long iova_rcache_get(struct iova_domain *iovad, | |
987 | unsigned long size, | |
988 | unsigned long limit_pfn) | |
989 | { | |
990 | unsigned int log_size = order_base_2(size); | |
991 | ||
992 | if (log_size >= IOVA_RANGE_CACHE_MAX_SIZE) | |
993 | return 0; | |
994 | ||
995 | return __iova_rcache_get(&iovad->rcaches[log_size], limit_pfn); | |
996 | } | |
997 | ||
998 | /* | |
999 | * Free a cpu's rcache. | |
1000 | */ | |
1001 | static void free_cpu_iova_rcache(unsigned int cpu, struct iova_domain *iovad, | |
1002 | struct iova_rcache *rcache) | |
1003 | { | |
1004 | struct iova_cpu_rcache *cpu_rcache = per_cpu_ptr(rcache->cpu_rcaches, cpu); | |
1005 | unsigned long flags; | |
1006 | ||
1007 | spin_lock_irqsave(&cpu_rcache->lock, flags); | |
1008 | ||
1009 | iova_magazine_free_pfns(cpu_rcache->loaded, iovad); | |
1010 | iova_magazine_free(cpu_rcache->loaded); | |
1011 | ||
1012 | iova_magazine_free_pfns(cpu_rcache->prev, iovad); | |
1013 | iova_magazine_free(cpu_rcache->prev); | |
1014 | ||
1015 | spin_unlock_irqrestore(&cpu_rcache->lock, flags); | |
1016 | } | |
1017 | ||
1018 | /* | |
1019 | * free rcache data structures. | |
1020 | */ | |
1021 | static void free_iova_rcaches(struct iova_domain *iovad) | |
1022 | { | |
1023 | struct iova_rcache *rcache; | |
1024 | unsigned long flags; | |
1025 | unsigned int cpu; | |
1026 | int i, j; | |
1027 | ||
1028 | for (i = 0; i < IOVA_RANGE_CACHE_MAX_SIZE; ++i) { | |
1029 | rcache = &iovad->rcaches[i]; | |
1030 | for_each_possible_cpu(cpu) | |
1031 | free_cpu_iova_rcache(cpu, iovad, rcache); | |
1032 | spin_lock_irqsave(&rcache->lock, flags); | |
1033 | free_percpu(rcache->cpu_rcaches); | |
1034 | for (j = 0; j < rcache->depot_size; ++j) { | |
1035 | iova_magazine_free_pfns(rcache->depot[j], iovad); | |
1036 | iova_magazine_free(rcache->depot[j]); | |
1037 | } | |
1038 | spin_unlock_irqrestore(&rcache->lock, flags); | |
1039 | } | |
1040 | } | |
1041 | ||
1042 | /* | |
1043 | * free all the IOVA ranges cached by a cpu (used when cpu is unplugged) | |
1044 | */ | |
1045 | void free_cpu_cached_iovas(unsigned int cpu, struct iova_domain *iovad) | |
1046 | { | |
1047 | struct iova_cpu_rcache *cpu_rcache; | |
1048 | struct iova_rcache *rcache; | |
1049 | unsigned long flags; | |
1050 | int i; | |
1051 | ||
1052 | for (i = 0; i < IOVA_RANGE_CACHE_MAX_SIZE; ++i) { | |
1053 | rcache = &iovad->rcaches[i]; | |
1054 | cpu_rcache = per_cpu_ptr(rcache->cpu_rcaches, cpu); | |
1055 | spin_lock_irqsave(&cpu_rcache->lock, flags); | |
1056 | iova_magazine_free_pfns(cpu_rcache->loaded, iovad); | |
1057 | iova_magazine_free_pfns(cpu_rcache->prev, iovad); | |
1058 | spin_unlock_irqrestore(&cpu_rcache->lock, flags); | |
1059 | } | |
1060 | } | |
1061 | ||
15bbdec3 SA |
1062 | MODULE_AUTHOR("Anil S Keshavamurthy <anil.s.keshavamurthy@intel.com>"); |
1063 | MODULE_LICENSE("GPL"); |