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 | 26 | |
bb68b2fb RM |
27 | /* The anchor node sits above the top of the usable address space */ |
28 | #define IOVA_ANCHOR ~0UL | |
29 | ||
9257b4a2 OP |
30 | static bool iova_rcache_insert(struct iova_domain *iovad, |
31 | unsigned long pfn, | |
32 | unsigned long size); | |
33 | static unsigned long iova_rcache_get(struct iova_domain *iovad, | |
34 | unsigned long size, | |
35 | unsigned long limit_pfn); | |
36 | static void init_iova_rcaches(struct iova_domain *iovad); | |
37 | static void free_iova_rcaches(struct iova_domain *iovad); | |
19282101 | 38 | static void fq_destroy_all_entries(struct iova_domain *iovad); |
e99e88a9 | 39 | static void fq_flush_timeout(struct timer_list *t); |
85b45456 | 40 | |
f8de50eb | 41 | void |
0fb5fe87 | 42 | init_iova_domain(struct iova_domain *iovad, unsigned long granule, |
aa3ac946 | 43 | unsigned long start_pfn) |
f8de50eb | 44 | { |
0fb5fe87 RM |
45 | /* |
46 | * IOVA granularity will normally be equal to the smallest | |
47 | * supported IOMMU page size; both *must* be capable of | |
48 | * representing individual CPU pages exactly. | |
49 | */ | |
50 | BUG_ON((granule > PAGE_SIZE) || !is_power_of_2(granule)); | |
51 | ||
f8de50eb KA |
52 | spin_lock_init(&iovad->iova_rbtree_lock); |
53 | iovad->rbroot = RB_ROOT; | |
973f5fbe RM |
54 | iovad->cached_node = &iovad->anchor.node; |
55 | iovad->cached32_node = &iovad->anchor.node; | |
0fb5fe87 | 56 | iovad->granule = granule; |
1b722500 | 57 | iovad->start_pfn = start_pfn; |
aa3ac946 | 58 | iovad->dma_32bit_pfn = 1UL << (32 - iova_shift(iovad)); |
bee60e94 | 59 | iovad->max32_alloc_size = iovad->dma_32bit_pfn; |
42f87e71 JR |
60 | iovad->flush_cb = NULL; |
61 | iovad->fq = NULL; | |
bb68b2fb RM |
62 | iovad->anchor.pfn_lo = iovad->anchor.pfn_hi = IOVA_ANCHOR; |
63 | rb_link_node(&iovad->anchor.node, NULL, &iovad->rbroot.rb_node); | |
64 | rb_insert_color(&iovad->anchor.node, &iovad->rbroot); | |
9257b4a2 | 65 | init_iova_rcaches(iovad); |
f8de50eb | 66 | } |
9b41760b | 67 | EXPORT_SYMBOL_GPL(init_iova_domain); |
f8de50eb | 68 | |
42f87e71 JR |
69 | static void free_iova_flush_queue(struct iova_domain *iovad) |
70 | { | |
71 | if (!iovad->fq) | |
72 | return; | |
73 | ||
9a005a80 JR |
74 | if (timer_pending(&iovad->fq_timer)) |
75 | del_timer(&iovad->fq_timer); | |
76 | ||
19282101 | 77 | fq_destroy_all_entries(iovad); |
9a005a80 | 78 | |
42f87e71 JR |
79 | free_percpu(iovad->fq); |
80 | ||
81 | iovad->fq = NULL; | |
82 | iovad->flush_cb = NULL; | |
83 | iovad->entry_dtor = NULL; | |
84 | } | |
85 | ||
86 | int init_iova_flush_queue(struct iova_domain *iovad, | |
87 | iova_flush_cb flush_cb, iova_entry_dtor entry_dtor) | |
88 | { | |
89 | int cpu; | |
90 | ||
fb418dab JR |
91 | atomic64_set(&iovad->fq_flush_start_cnt, 0); |
92 | atomic64_set(&iovad->fq_flush_finish_cnt, 0); | |
93 | ||
42f87e71 JR |
94 | iovad->fq = alloc_percpu(struct iova_fq); |
95 | if (!iovad->fq) | |
96 | return -ENOMEM; | |
97 | ||
98 | iovad->flush_cb = flush_cb; | |
99 | iovad->entry_dtor = entry_dtor; | |
100 | ||
101 | for_each_possible_cpu(cpu) { | |
102 | struct iova_fq *fq; | |
103 | ||
104 | fq = per_cpu_ptr(iovad->fq, cpu); | |
105 | fq->head = 0; | |
106 | fq->tail = 0; | |
8109c2a2 JR |
107 | |
108 | spin_lock_init(&fq->lock); | |
42f87e71 JR |
109 | } |
110 | ||
e99e88a9 | 111 | timer_setup(&iovad->fq_timer, fq_flush_timeout, 0); |
9a005a80 JR |
112 | atomic_set(&iovad->fq_timer_on, 0); |
113 | ||
42f87e71 JR |
114 | return 0; |
115 | } | |
116 | EXPORT_SYMBOL_GPL(init_iova_flush_queue); | |
117 | ||
f8de50eb | 118 | static struct rb_node * |
973f5fbe | 119 | __get_cached_rbnode(struct iova_domain *iovad, unsigned long limit_pfn) |
f8de50eb | 120 | { |
973f5fbe RM |
121 | if (limit_pfn <= iovad->dma_32bit_pfn) |
122 | return iovad->cached32_node; | |
e60aa7b5 | 123 | |
973f5fbe | 124 | return iovad->cached_node; |
f8de50eb KA |
125 | } |
126 | ||
127 | static void | |
e60aa7b5 | 128 | __cached_rbnode_insert_update(struct iova_domain *iovad, struct iova *new) |
f8de50eb | 129 | { |
e60aa7b5 RM |
130 | if (new->pfn_hi < iovad->dma_32bit_pfn) |
131 | iovad->cached32_node = &new->node; | |
132 | else | |
133 | iovad->cached_node = &new->node; | |
f8de50eb KA |
134 | } |
135 | ||
136 | static void | |
137 | __cached_rbnode_delete_update(struct iova_domain *iovad, struct iova *free) | |
138 | { | |
139 | struct iova *cached_iova; | |
f8de50eb | 140 | |
e60aa7b5 RM |
141 | cached_iova = rb_entry(iovad->cached32_node, struct iova, node); |
142 | if (free->pfn_hi < iovad->dma_32bit_pfn && | |
bee60e94 | 143 | free->pfn_lo >= cached_iova->pfn_lo) { |
e60aa7b5 | 144 | iovad->cached32_node = rb_next(&free->node); |
bee60e94 GK |
145 | iovad->max32_alloc_size = iovad->dma_32bit_pfn; |
146 | } | |
e60aa7b5 RM |
147 | |
148 | cached_iova = rb_entry(iovad->cached_node, struct iova, node); | |
973f5fbe | 149 | if (free->pfn_lo >= cached_iova->pfn_lo) |
e60aa7b5 | 150 | iovad->cached_node = rb_next(&free->node); |
f8de50eb KA |
151 | } |
152 | ||
d751751a MS |
153 | /* Insert the iova into domain rbtree by holding writer lock */ |
154 | static void | |
155 | iova_insert_rbtree(struct rb_root *root, struct iova *iova, | |
156 | struct rb_node *start) | |
157 | { | |
158 | struct rb_node **new, *parent = NULL; | |
159 | ||
160 | new = (start) ? &start : &(root->rb_node); | |
161 | /* Figure out where to put new node */ | |
162 | while (*new) { | |
163 | struct iova *this = rb_entry(*new, struct iova, node); | |
164 | ||
165 | parent = *new; | |
166 | ||
167 | if (iova->pfn_lo < this->pfn_lo) | |
168 | new = &((*new)->rb_left); | |
169 | else if (iova->pfn_lo > this->pfn_lo) | |
170 | new = &((*new)->rb_right); | |
171 | else { | |
172 | WARN_ON(1); /* this should not happen */ | |
173 | return; | |
174 | } | |
175 | } | |
176 | /* Add new node and rebalance tree. */ | |
177 | rb_link_node(&iova->node, parent, new); | |
178 | rb_insert_color(&iova->node, root); | |
179 | } | |
180 | ||
ddf02886 | 181 | static int __alloc_and_insert_iova_range(struct iova_domain *iovad, |
182 | unsigned long size, unsigned long limit_pfn, | |
183 | struct iova *new, bool size_aligned) | |
f8de50eb | 184 | { |
973f5fbe RM |
185 | struct rb_node *curr, *prev; |
186 | struct iova *curr_iova; | |
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); | |
bee60e94 GK |
196 | if (limit_pfn <= iovad->dma_32bit_pfn && |
197 | size >= iovad->max32_alloc_size) | |
198 | goto iova32_full; | |
199 | ||
973f5fbe RM |
200 | curr = __get_cached_rbnode(iovad, limit_pfn); |
201 | curr_iova = rb_entry(curr, struct iova, node); | |
202 | do { | |
203 | limit_pfn = min(limit_pfn, curr_iova->pfn_lo); | |
204 | new_pfn = (limit_pfn - size) & align_mask; | |
ddf02886 | 205 | prev = curr; |
f8de50eb | 206 | curr = rb_prev(curr); |
973f5fbe RM |
207 | curr_iova = rb_entry(curr, struct iova, node); |
208 | } while (curr && new_pfn <= curr_iova->pfn_hi); | |
f8de50eb | 209 | |
80ef4464 RR |
210 | if (limit_pfn < size || new_pfn < iovad->start_pfn) { |
211 | iovad->max32_alloc_size = size; | |
bee60e94 | 212 | goto iova32_full; |
80ef4464 | 213 | } |
f76aec76 KA |
214 | |
215 | /* pfn_lo will point to size aligned address if size_aligned is set */ | |
086c83ac | 216 | new->pfn_lo = new_pfn; |
f76aec76 | 217 | new->pfn_hi = new->pfn_lo + size - 1; |
f8de50eb | 218 | |
d751751a MS |
219 | /* If we have 'prev', it's a valid place to start the insertion. */ |
220 | iova_insert_rbtree(&iovad->rbroot, new, prev); | |
e60aa7b5 | 221 | __cached_rbnode_insert_update(iovad, new); |
ddf02886 | 222 | |
f8de50eb KA |
223 | spin_unlock_irqrestore(&iovad->iova_rbtree_lock, flags); |
224 | return 0; | |
bee60e94 GK |
225 | |
226 | iova32_full: | |
bee60e94 GK |
227 | spin_unlock_irqrestore(&iovad->iova_rbtree_lock, flags); |
228 | return -ENOMEM; | |
f8de50eb KA |
229 | } |
230 | ||
ae1ff3d6 SA |
231 | static struct kmem_cache *iova_cache; |
232 | static unsigned int iova_cache_users; | |
233 | static DEFINE_MUTEX(iova_cache_mutex); | |
234 | ||
235 | struct iova *alloc_iova_mem(void) | |
236 | { | |
237 | return kmem_cache_alloc(iova_cache, GFP_ATOMIC); | |
238 | } | |
239 | EXPORT_SYMBOL(alloc_iova_mem); | |
240 | ||
241 | void free_iova_mem(struct iova *iova) | |
242 | { | |
bb68b2fb RM |
243 | if (iova->pfn_lo != IOVA_ANCHOR) |
244 | kmem_cache_free(iova_cache, iova); | |
ae1ff3d6 SA |
245 | } |
246 | EXPORT_SYMBOL(free_iova_mem); | |
247 | ||
248 | int iova_cache_get(void) | |
249 | { | |
250 | mutex_lock(&iova_cache_mutex); | |
251 | if (!iova_cache_users) { | |
252 | iova_cache = kmem_cache_create( | |
253 | "iommu_iova", sizeof(struct iova), 0, | |
254 | SLAB_HWCACHE_ALIGN, NULL); | |
255 | if (!iova_cache) { | |
256 | mutex_unlock(&iova_cache_mutex); | |
257 | printk(KERN_ERR "Couldn't create iova cache\n"); | |
258 | return -ENOMEM; | |
259 | } | |
260 | } | |
261 | ||
262 | iova_cache_users++; | |
263 | mutex_unlock(&iova_cache_mutex); | |
264 | ||
265 | return 0; | |
266 | } | |
9b41760b | 267 | EXPORT_SYMBOL_GPL(iova_cache_get); |
ae1ff3d6 SA |
268 | |
269 | void iova_cache_put(void) | |
270 | { | |
271 | mutex_lock(&iova_cache_mutex); | |
272 | if (WARN_ON(!iova_cache_users)) { | |
273 | mutex_unlock(&iova_cache_mutex); | |
274 | return; | |
275 | } | |
276 | iova_cache_users--; | |
277 | if (!iova_cache_users) | |
278 | kmem_cache_destroy(iova_cache); | |
279 | mutex_unlock(&iova_cache_mutex); | |
280 | } | |
9b41760b | 281 | EXPORT_SYMBOL_GPL(iova_cache_put); |
ae1ff3d6 | 282 | |
f8de50eb KA |
283 | /** |
284 | * alloc_iova - allocates an iova | |
07db0409 MI |
285 | * @iovad: - iova domain in question |
286 | * @size: - size of page frames to allocate | |
287 | * @limit_pfn: - max limit address | |
288 | * @size_aligned: - set if size_aligned address range is required | |
1b722500 RM |
289 | * This function allocates an iova in the range iovad->start_pfn to limit_pfn, |
290 | * searching top-down from limit_pfn to iovad->start_pfn. If the size_aligned | |
f76aec76 KA |
291 | * flag is set then the allocated address iova->pfn_lo will be naturally |
292 | * aligned on roundup_power_of_two(size). | |
f8de50eb KA |
293 | */ |
294 | struct iova * | |
295 | alloc_iova(struct iova_domain *iovad, unsigned long size, | |
f76aec76 KA |
296 | unsigned long limit_pfn, |
297 | bool size_aligned) | |
f8de50eb | 298 | { |
f8de50eb KA |
299 | struct iova *new_iova; |
300 | int ret; | |
301 | ||
302 | new_iova = alloc_iova_mem(); | |
303 | if (!new_iova) | |
304 | return NULL; | |
305 | ||
757c370f | 306 | ret = __alloc_and_insert_iova_range(iovad, size, limit_pfn + 1, |
ddf02886 | 307 | new_iova, size_aligned); |
f8de50eb KA |
308 | |
309 | if (ret) { | |
f8de50eb KA |
310 | free_iova_mem(new_iova); |
311 | return NULL; | |
312 | } | |
313 | ||
f8de50eb KA |
314 | return new_iova; |
315 | } | |
9b41760b | 316 | EXPORT_SYMBOL_GPL(alloc_iova); |
f8de50eb | 317 | |
9257b4a2 OP |
318 | static struct iova * |
319 | private_find_iova(struct iova_domain *iovad, unsigned long pfn) | |
f8de50eb | 320 | { |
9257b4a2 OP |
321 | struct rb_node *node = iovad->rbroot.rb_node; |
322 | ||
323 | assert_spin_locked(&iovad->iova_rbtree_lock); | |
f8de50eb | 324 | |
f8de50eb | 325 | while (node) { |
eba484b5 | 326 | struct iova *iova = rb_entry(node, struct iova, node); |
f8de50eb | 327 | |
f8de50eb KA |
328 | if (pfn < iova->pfn_lo) |
329 | node = node->rb_left; | |
2070f940 | 330 | else if (pfn > iova->pfn_hi) |
f8de50eb | 331 | node = node->rb_right; |
2070f940 ZL |
332 | else |
333 | return iova; /* pfn falls within iova's range */ | |
f8de50eb KA |
334 | } |
335 | ||
f8de50eb KA |
336 | return NULL; |
337 | } | |
9257b4a2 OP |
338 | |
339 | static void private_free_iova(struct iova_domain *iovad, struct iova *iova) | |
340 | { | |
341 | assert_spin_locked(&iovad->iova_rbtree_lock); | |
342 | __cached_rbnode_delete_update(iovad, iova); | |
343 | rb_erase(&iova->node, &iovad->rbroot); | |
344 | free_iova_mem(iova); | |
345 | } | |
346 | ||
347 | /** | |
348 | * find_iova - finds an iova for a given pfn | |
349 | * @iovad: - iova domain in question. | |
350 | * @pfn: - page frame number | |
351 | * This function finds and returns an iova belonging to the | |
352 | * given doamin which matches the given pfn. | |
353 | */ | |
354 | struct iova *find_iova(struct iova_domain *iovad, unsigned long pfn) | |
355 | { | |
356 | unsigned long flags; | |
357 | struct iova *iova; | |
358 | ||
359 | /* Take the lock so that no other thread is manipulating the rbtree */ | |
360 | spin_lock_irqsave(&iovad->iova_rbtree_lock, flags); | |
361 | iova = private_find_iova(iovad, pfn); | |
362 | spin_unlock_irqrestore(&iovad->iova_rbtree_lock, flags); | |
363 | return iova; | |
364 | } | |
9b41760b | 365 | EXPORT_SYMBOL_GPL(find_iova); |
f8de50eb KA |
366 | |
367 | /** | |
368 | * __free_iova - frees the given iova | |
369 | * @iovad: iova domain in question. | |
370 | * @iova: iova in question. | |
371 | * Frees the given iova belonging to the giving domain | |
372 | */ | |
373 | void | |
374 | __free_iova(struct iova_domain *iovad, struct iova *iova) | |
375 | { | |
376 | unsigned long flags; | |
377 | ||
378 | spin_lock_irqsave(&iovad->iova_rbtree_lock, flags); | |
9257b4a2 | 379 | private_free_iova(iovad, iova); |
f8de50eb | 380 | spin_unlock_irqrestore(&iovad->iova_rbtree_lock, flags); |
f8de50eb | 381 | } |
9b41760b | 382 | EXPORT_SYMBOL_GPL(__free_iova); |
f8de50eb KA |
383 | |
384 | /** | |
385 | * free_iova - finds and frees the iova for a given pfn | |
386 | * @iovad: - iova domain in question. | |
387 | * @pfn: - pfn that is allocated previously | |
388 | * This functions finds an iova for a given pfn and then | |
389 | * frees the iova from that domain. | |
390 | */ | |
391 | void | |
392 | free_iova(struct iova_domain *iovad, unsigned long pfn) | |
393 | { | |
394 | struct iova *iova = find_iova(iovad, pfn); | |
733cac2a | 395 | |
f8de50eb KA |
396 | if (iova) |
397 | __free_iova(iovad, iova); | |
398 | ||
399 | } | |
9b41760b | 400 | EXPORT_SYMBOL_GPL(free_iova); |
f8de50eb | 401 | |
9257b4a2 OP |
402 | /** |
403 | * alloc_iova_fast - allocates an iova from rcache | |
404 | * @iovad: - iova domain in question | |
405 | * @size: - size of page frames to allocate | |
406 | * @limit_pfn: - max limit address | |
538d5b33 | 407 | * @flush_rcache: - set to flush rcache on regular allocation failure |
9257b4a2 | 408 | * This function tries to satisfy an iova allocation from the rcache, |
538d5b33 TN |
409 | * and falls back to regular allocation on failure. If regular allocation |
410 | * fails too and the flush_rcache flag is set then the rcache will be flushed. | |
9257b4a2 OP |
411 | */ |
412 | unsigned long | |
413 | alloc_iova_fast(struct iova_domain *iovad, unsigned long size, | |
538d5b33 | 414 | unsigned long limit_pfn, bool flush_rcache) |
9257b4a2 | 415 | { |
9257b4a2 OP |
416 | unsigned long iova_pfn; |
417 | struct iova *new_iova; | |
418 | ||
b826ee9a | 419 | iova_pfn = iova_rcache_get(iovad, size, limit_pfn + 1); |
9257b4a2 OP |
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 | ||
538d5b33 | 428 | if (!flush_rcache) |
9257b4a2 OP |
429 | return 0; |
430 | ||
431 | /* Try replenishing IOVAs by flushing rcache. */ | |
538d5b33 | 432 | flush_rcache = false; |
9257b4a2 OP |
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 | ||
e99e88a9 | 531 | static void fq_flush_timeout(struct timer_list *t) |
9a005a80 | 532 | { |
e99e88a9 | 533 | struct iova_domain *iovad = from_timer(iovad, t, fq_timer); |
9a005a80 JR |
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 | { | |
94e2cc4d | 554 | struct iova_fq *fq = raw_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)); | |
19282101 JR |
584 | } |
585 | EXPORT_SYMBOL_GPL(queue_iova); | |
586 | ||
f8de50eb KA |
587 | /** |
588 | * put_iova_domain - destroys the iova doamin | |
589 | * @iovad: - iova domain in question. | |
590 | * All the iova's in that domain are destroyed. | |
591 | */ | |
592 | void put_iova_domain(struct iova_domain *iovad) | |
593 | { | |
7595dc58 | 594 | struct iova *iova, *tmp; |
f8de50eb | 595 | |
42f87e71 | 596 | free_iova_flush_queue(iovad); |
9257b4a2 | 597 | free_iova_rcaches(iovad); |
7595dc58 | 598 | rbtree_postorder_for_each_entry_safe(iova, tmp, &iovad->rbroot, node) |
f8de50eb | 599 | free_iova_mem(iova); |
f8de50eb | 600 | } |
9b41760b | 601 | EXPORT_SYMBOL_GPL(put_iova_domain); |
f8de50eb KA |
602 | |
603 | static int | |
604 | __is_range_overlap(struct rb_node *node, | |
605 | unsigned long pfn_lo, unsigned long pfn_hi) | |
606 | { | |
eba484b5 | 607 | struct iova *iova = rb_entry(node, struct iova, node); |
f8de50eb KA |
608 | |
609 | if ((pfn_lo <= iova->pfn_hi) && (pfn_hi >= iova->pfn_lo)) | |
610 | return 1; | |
611 | return 0; | |
612 | } | |
613 | ||
75f05569 JL |
614 | static inline struct iova * |
615 | alloc_and_init_iova(unsigned long pfn_lo, unsigned long pfn_hi) | |
616 | { | |
617 | struct iova *iova; | |
618 | ||
619 | iova = alloc_iova_mem(); | |
620 | if (iova) { | |
621 | iova->pfn_lo = pfn_lo; | |
622 | iova->pfn_hi = pfn_hi; | |
623 | } | |
624 | ||
625 | return iova; | |
626 | } | |
627 | ||
f8de50eb KA |
628 | static struct iova * |
629 | __insert_new_range(struct iova_domain *iovad, | |
630 | unsigned long pfn_lo, unsigned long pfn_hi) | |
631 | { | |
632 | struct iova *iova; | |
633 | ||
75f05569 JL |
634 | iova = alloc_and_init_iova(pfn_lo, pfn_hi); |
635 | if (iova) | |
d751751a | 636 | iova_insert_rbtree(&iovad->rbroot, iova, NULL); |
f8de50eb | 637 | |
f8de50eb KA |
638 | return iova; |
639 | } | |
640 | ||
641 | static void | |
642 | __adjust_overlap_range(struct iova *iova, | |
643 | unsigned long *pfn_lo, unsigned long *pfn_hi) | |
644 | { | |
645 | if (*pfn_lo < iova->pfn_lo) | |
646 | iova->pfn_lo = *pfn_lo; | |
647 | if (*pfn_hi > iova->pfn_hi) | |
648 | *pfn_lo = iova->pfn_hi + 1; | |
649 | } | |
650 | ||
651 | /** | |
652 | * reserve_iova - reserves an iova in the given range | |
653 | * @iovad: - iova domain pointer | |
654 | * @pfn_lo: - lower page frame address | |
655 | * @pfn_hi:- higher pfn adderss | |
656 | * This function allocates reserves the address range from pfn_lo to pfn_hi so | |
657 | * that this address is not dished out as part of alloc_iova. | |
658 | */ | |
659 | struct iova * | |
660 | reserve_iova(struct iova_domain *iovad, | |
661 | unsigned long pfn_lo, unsigned long pfn_hi) | |
662 | { | |
663 | struct rb_node *node; | |
664 | unsigned long flags; | |
665 | struct iova *iova; | |
666 | unsigned int overlap = 0; | |
667 | ||
bb68b2fb RM |
668 | /* Don't allow nonsensical pfns */ |
669 | if (WARN_ON((pfn_hi | pfn_lo) > (ULLONG_MAX >> iova_shift(iovad)))) | |
670 | return NULL; | |
671 | ||
3d39cecc | 672 | spin_lock_irqsave(&iovad->iova_rbtree_lock, flags); |
f8de50eb KA |
673 | for (node = rb_first(&iovad->rbroot); node; node = rb_next(node)) { |
674 | if (__is_range_overlap(node, pfn_lo, pfn_hi)) { | |
eba484b5 | 675 | iova = rb_entry(node, struct iova, node); |
f8de50eb KA |
676 | __adjust_overlap_range(iova, &pfn_lo, &pfn_hi); |
677 | if ((pfn_lo >= iova->pfn_lo) && | |
678 | (pfn_hi <= iova->pfn_hi)) | |
679 | goto finish; | |
680 | overlap = 1; | |
681 | ||
682 | } else if (overlap) | |
683 | break; | |
684 | } | |
685 | ||
25985edc | 686 | /* We are here either because this is the first reserver node |
f8de50eb KA |
687 | * or need to insert remaining non overlap addr range |
688 | */ | |
689 | iova = __insert_new_range(iovad, pfn_lo, pfn_hi); | |
690 | finish: | |
691 | ||
3d39cecc | 692 | spin_unlock_irqrestore(&iovad->iova_rbtree_lock, flags); |
f8de50eb KA |
693 | return iova; |
694 | } | |
9b41760b | 695 | EXPORT_SYMBOL_GPL(reserve_iova); |
f8de50eb KA |
696 | |
697 | /** | |
698 | * copy_reserved_iova - copies the reserved between domains | |
699 | * @from: - source doamin from where to copy | |
700 | * @to: - destination domin where to copy | |
701 | * This function copies reserved iova's from one doamin to | |
702 | * other. | |
703 | */ | |
704 | void | |
705 | copy_reserved_iova(struct iova_domain *from, struct iova_domain *to) | |
706 | { | |
707 | unsigned long flags; | |
708 | struct rb_node *node; | |
709 | ||
3d39cecc | 710 | spin_lock_irqsave(&from->iova_rbtree_lock, flags); |
f8de50eb | 711 | for (node = rb_first(&from->rbroot); node; node = rb_next(node)) { |
eba484b5 | 712 | struct iova *iova = rb_entry(node, struct iova, node); |
f8de50eb | 713 | struct iova *new_iova; |
733cac2a | 714 | |
abbb8a09 RM |
715 | if (iova->pfn_lo == IOVA_ANCHOR) |
716 | continue; | |
717 | ||
f8de50eb KA |
718 | new_iova = reserve_iova(to, iova->pfn_lo, iova->pfn_hi); |
719 | if (!new_iova) | |
720 | printk(KERN_ERR "Reserve iova range %lx@%lx failed\n", | |
721 | iova->pfn_lo, iova->pfn_lo); | |
722 | } | |
3d39cecc | 723 | spin_unlock_irqrestore(&from->iova_rbtree_lock, flags); |
f8de50eb | 724 | } |
9b41760b | 725 | EXPORT_SYMBOL_GPL(copy_reserved_iova); |
75f05569 JL |
726 | |
727 | struct iova * | |
728 | split_and_remove_iova(struct iova_domain *iovad, struct iova *iova, | |
729 | unsigned long pfn_lo, unsigned long pfn_hi) | |
730 | { | |
731 | unsigned long flags; | |
732 | struct iova *prev = NULL, *next = NULL; | |
733 | ||
734 | spin_lock_irqsave(&iovad->iova_rbtree_lock, flags); | |
735 | if (iova->pfn_lo < pfn_lo) { | |
736 | prev = alloc_and_init_iova(iova->pfn_lo, pfn_lo - 1); | |
737 | if (prev == NULL) | |
738 | goto error; | |
739 | } | |
740 | if (iova->pfn_hi > pfn_hi) { | |
741 | next = alloc_and_init_iova(pfn_hi + 1, iova->pfn_hi); | |
742 | if (next == NULL) | |
743 | goto error; | |
744 | } | |
745 | ||
746 | __cached_rbnode_delete_update(iovad, iova); | |
747 | rb_erase(&iova->node, &iovad->rbroot); | |
748 | ||
749 | if (prev) { | |
d751751a | 750 | iova_insert_rbtree(&iovad->rbroot, prev, NULL); |
75f05569 JL |
751 | iova->pfn_lo = pfn_lo; |
752 | } | |
753 | if (next) { | |
d751751a | 754 | iova_insert_rbtree(&iovad->rbroot, next, NULL); |
75f05569 JL |
755 | iova->pfn_hi = pfn_hi; |
756 | } | |
757 | spin_unlock_irqrestore(&iovad->iova_rbtree_lock, flags); | |
758 | ||
759 | return iova; | |
760 | ||
761 | error: | |
762 | spin_unlock_irqrestore(&iovad->iova_rbtree_lock, flags); | |
763 | if (prev) | |
764 | free_iova_mem(prev); | |
765 | return NULL; | |
766 | } | |
15bbdec3 | 767 | |
9257b4a2 OP |
768 | /* |
769 | * Magazine caches for IOVA ranges. For an introduction to magazines, | |
770 | * see the USENIX 2001 paper "Magazines and Vmem: Extending the Slab | |
771 | * Allocator to Many CPUs and Arbitrary Resources" by Bonwick and Adams. | |
772 | * For simplicity, we use a static magazine size and don't implement the | |
773 | * dynamic size tuning described in the paper. | |
774 | */ | |
775 | ||
776 | #define IOVA_MAG_SIZE 128 | |
777 | ||
778 | struct iova_magazine { | |
779 | unsigned long size; | |
780 | unsigned long pfns[IOVA_MAG_SIZE]; | |
781 | }; | |
782 | ||
783 | struct iova_cpu_rcache { | |
784 | spinlock_t lock; | |
785 | struct iova_magazine *loaded; | |
786 | struct iova_magazine *prev; | |
787 | }; | |
788 | ||
789 | static struct iova_magazine *iova_magazine_alloc(gfp_t flags) | |
790 | { | |
791 | return kzalloc(sizeof(struct iova_magazine), flags); | |
792 | } | |
793 | ||
794 | static void iova_magazine_free(struct iova_magazine *mag) | |
795 | { | |
796 | kfree(mag); | |
797 | } | |
798 | ||
799 | static void | |
800 | iova_magazine_free_pfns(struct iova_magazine *mag, struct iova_domain *iovad) | |
801 | { | |
802 | unsigned long flags; | |
803 | int i; | |
804 | ||
805 | if (!mag) | |
806 | return; | |
807 | ||
808 | spin_lock_irqsave(&iovad->iova_rbtree_lock, flags); | |
809 | ||
810 | for (i = 0 ; i < mag->size; ++i) { | |
811 | struct iova *iova = private_find_iova(iovad, mag->pfns[i]); | |
812 | ||
813 | BUG_ON(!iova); | |
814 | private_free_iova(iovad, iova); | |
815 | } | |
816 | ||
817 | spin_unlock_irqrestore(&iovad->iova_rbtree_lock, flags); | |
818 | ||
819 | mag->size = 0; | |
820 | } | |
821 | ||
822 | static bool iova_magazine_full(struct iova_magazine *mag) | |
823 | { | |
824 | return (mag && mag->size == IOVA_MAG_SIZE); | |
825 | } | |
826 | ||
827 | static bool iova_magazine_empty(struct iova_magazine *mag) | |
828 | { | |
829 | return (!mag || mag->size == 0); | |
830 | } | |
831 | ||
832 | static unsigned long iova_magazine_pop(struct iova_magazine *mag, | |
833 | unsigned long limit_pfn) | |
834 | { | |
e8b19840 RM |
835 | int i; |
836 | unsigned long pfn; | |
837 | ||
9257b4a2 OP |
838 | BUG_ON(iova_magazine_empty(mag)); |
839 | ||
e8b19840 RM |
840 | /* Only fall back to the rbtree if we have no suitable pfns at all */ |
841 | for (i = mag->size - 1; mag->pfns[i] > limit_pfn; i--) | |
842 | if (i == 0) | |
843 | return 0; | |
844 | ||
845 | /* Swap it to pop it */ | |
846 | pfn = mag->pfns[i]; | |
847 | mag->pfns[i] = mag->pfns[--mag->size]; | |
9257b4a2 | 848 | |
e8b19840 | 849 | return pfn; |
9257b4a2 OP |
850 | } |
851 | ||
852 | static void iova_magazine_push(struct iova_magazine *mag, unsigned long pfn) | |
853 | { | |
854 | BUG_ON(iova_magazine_full(mag)); | |
855 | ||
856 | mag->pfns[mag->size++] = pfn; | |
857 | } | |
858 | ||
859 | static void init_iova_rcaches(struct iova_domain *iovad) | |
860 | { | |
861 | struct iova_cpu_rcache *cpu_rcache; | |
862 | struct iova_rcache *rcache; | |
863 | unsigned int cpu; | |
864 | int i; | |
865 | ||
866 | for (i = 0; i < IOVA_RANGE_CACHE_MAX_SIZE; ++i) { | |
867 | rcache = &iovad->rcaches[i]; | |
868 | spin_lock_init(&rcache->lock); | |
869 | rcache->depot_size = 0; | |
870 | rcache->cpu_rcaches = __alloc_percpu(sizeof(*cpu_rcache), cache_line_size()); | |
871 | if (WARN_ON(!rcache->cpu_rcaches)) | |
872 | continue; | |
873 | for_each_possible_cpu(cpu) { | |
874 | cpu_rcache = per_cpu_ptr(rcache->cpu_rcaches, cpu); | |
875 | spin_lock_init(&cpu_rcache->lock); | |
876 | cpu_rcache->loaded = iova_magazine_alloc(GFP_KERNEL); | |
877 | cpu_rcache->prev = iova_magazine_alloc(GFP_KERNEL); | |
878 | } | |
879 | } | |
880 | } | |
881 | ||
882 | /* | |
883 | * Try inserting IOVA range starting with 'iova_pfn' into 'rcache', and | |
884 | * return true on success. Can fail if rcache is full and we can't free | |
885 | * space, and free_iova() (our only caller) will then return the IOVA | |
886 | * range to the rbtree instead. | |
887 | */ | |
888 | static bool __iova_rcache_insert(struct iova_domain *iovad, | |
889 | struct iova_rcache *rcache, | |
890 | unsigned long iova_pfn) | |
891 | { | |
892 | struct iova_magazine *mag_to_free = NULL; | |
893 | struct iova_cpu_rcache *cpu_rcache; | |
894 | bool can_insert = false; | |
895 | unsigned long flags; | |
896 | ||
aaffaa8a | 897 | cpu_rcache = raw_cpu_ptr(rcache->cpu_rcaches); |
9257b4a2 OP |
898 | spin_lock_irqsave(&cpu_rcache->lock, flags); |
899 | ||
900 | if (!iova_magazine_full(cpu_rcache->loaded)) { | |
901 | can_insert = true; | |
902 | } else if (!iova_magazine_full(cpu_rcache->prev)) { | |
903 | swap(cpu_rcache->prev, cpu_rcache->loaded); | |
904 | can_insert = true; | |
905 | } else { | |
906 | struct iova_magazine *new_mag = iova_magazine_alloc(GFP_ATOMIC); | |
907 | ||
908 | if (new_mag) { | |
909 | spin_lock(&rcache->lock); | |
910 | if (rcache->depot_size < MAX_GLOBAL_MAGS) { | |
911 | rcache->depot[rcache->depot_size++] = | |
912 | cpu_rcache->loaded; | |
913 | } else { | |
914 | mag_to_free = cpu_rcache->loaded; | |
915 | } | |
916 | spin_unlock(&rcache->lock); | |
917 | ||
918 | cpu_rcache->loaded = new_mag; | |
919 | can_insert = true; | |
920 | } | |
921 | } | |
922 | ||
923 | if (can_insert) | |
924 | iova_magazine_push(cpu_rcache->loaded, iova_pfn); | |
925 | ||
926 | spin_unlock_irqrestore(&cpu_rcache->lock, flags); | |
927 | ||
928 | if (mag_to_free) { | |
929 | iova_magazine_free_pfns(mag_to_free, iovad); | |
930 | iova_magazine_free(mag_to_free); | |
931 | } | |
932 | ||
933 | return can_insert; | |
934 | } | |
935 | ||
936 | static bool iova_rcache_insert(struct iova_domain *iovad, unsigned long pfn, | |
937 | unsigned long size) | |
938 | { | |
939 | unsigned int log_size = order_base_2(size); | |
940 | ||
941 | if (log_size >= IOVA_RANGE_CACHE_MAX_SIZE) | |
942 | return false; | |
943 | ||
944 | return __iova_rcache_insert(iovad, &iovad->rcaches[log_size], pfn); | |
945 | } | |
946 | ||
947 | /* | |
948 | * Caller wants to allocate a new IOVA range from 'rcache'. If we can | |
949 | * satisfy the request, return a matching non-NULL range and remove | |
950 | * it from the 'rcache'. | |
951 | */ | |
952 | static unsigned long __iova_rcache_get(struct iova_rcache *rcache, | |
953 | unsigned long limit_pfn) | |
954 | { | |
955 | struct iova_cpu_rcache *cpu_rcache; | |
956 | unsigned long iova_pfn = 0; | |
957 | bool has_pfn = false; | |
958 | unsigned long flags; | |
959 | ||
aaffaa8a | 960 | cpu_rcache = raw_cpu_ptr(rcache->cpu_rcaches); |
9257b4a2 OP |
961 | spin_lock_irqsave(&cpu_rcache->lock, flags); |
962 | ||
963 | if (!iova_magazine_empty(cpu_rcache->loaded)) { | |
964 | has_pfn = true; | |
965 | } else if (!iova_magazine_empty(cpu_rcache->prev)) { | |
966 | swap(cpu_rcache->prev, cpu_rcache->loaded); | |
967 | has_pfn = true; | |
968 | } else { | |
969 | spin_lock(&rcache->lock); | |
970 | if (rcache->depot_size > 0) { | |
971 | iova_magazine_free(cpu_rcache->loaded); | |
972 | cpu_rcache->loaded = rcache->depot[--rcache->depot_size]; | |
973 | has_pfn = true; | |
974 | } | |
975 | spin_unlock(&rcache->lock); | |
976 | } | |
977 | ||
978 | if (has_pfn) | |
979 | iova_pfn = iova_magazine_pop(cpu_rcache->loaded, limit_pfn); | |
980 | ||
981 | spin_unlock_irqrestore(&cpu_rcache->lock, flags); | |
982 | ||
983 | return iova_pfn; | |
984 | } | |
985 | ||
986 | /* | |
987 | * Try to satisfy IOVA allocation range from rcache. Fail if requested | |
988 | * size is too big or the DMA limit we are given isn't satisfied by the | |
989 | * top element in the magazine. | |
990 | */ | |
991 | static unsigned long iova_rcache_get(struct iova_domain *iovad, | |
992 | unsigned long size, | |
993 | unsigned long limit_pfn) | |
994 | { | |
995 | unsigned int log_size = order_base_2(size); | |
996 | ||
997 | if (log_size >= IOVA_RANGE_CACHE_MAX_SIZE) | |
998 | return 0; | |
999 | ||
b826ee9a | 1000 | return __iova_rcache_get(&iovad->rcaches[log_size], limit_pfn - size); |
9257b4a2 OP |
1001 | } |
1002 | ||
9257b4a2 OP |
1003 | /* |
1004 | * free rcache data structures. | |
1005 | */ | |
1006 | static void free_iova_rcaches(struct iova_domain *iovad) | |
1007 | { | |
1008 | struct iova_rcache *rcache; | |
7595dc58 | 1009 | struct iova_cpu_rcache *cpu_rcache; |
9257b4a2 OP |
1010 | unsigned int cpu; |
1011 | int i, j; | |
1012 | ||
1013 | for (i = 0; i < IOVA_RANGE_CACHE_MAX_SIZE; ++i) { | |
1014 | rcache = &iovad->rcaches[i]; | |
7595dc58 RM |
1015 | for_each_possible_cpu(cpu) { |
1016 | cpu_rcache = per_cpu_ptr(rcache->cpu_rcaches, cpu); | |
1017 | iova_magazine_free(cpu_rcache->loaded); | |
1018 | iova_magazine_free(cpu_rcache->prev); | |
1019 | } | |
9257b4a2 | 1020 | free_percpu(rcache->cpu_rcaches); |
7595dc58 | 1021 | for (j = 0; j < rcache->depot_size; ++j) |
9257b4a2 | 1022 | iova_magazine_free(rcache->depot[j]); |
9257b4a2 OP |
1023 | } |
1024 | } | |
1025 | ||
1026 | /* | |
1027 | * free all the IOVA ranges cached by a cpu (used when cpu is unplugged) | |
1028 | */ | |
1029 | void free_cpu_cached_iovas(unsigned int cpu, struct iova_domain *iovad) | |
1030 | { | |
1031 | struct iova_cpu_rcache *cpu_rcache; | |
1032 | struct iova_rcache *rcache; | |
1033 | unsigned long flags; | |
1034 | int i; | |
1035 | ||
1036 | for (i = 0; i < IOVA_RANGE_CACHE_MAX_SIZE; ++i) { | |
1037 | rcache = &iovad->rcaches[i]; | |
1038 | cpu_rcache = per_cpu_ptr(rcache->cpu_rcaches, cpu); | |
1039 | spin_lock_irqsave(&cpu_rcache->lock, flags); | |
1040 | iova_magazine_free_pfns(cpu_rcache->loaded, iovad); | |
1041 | iova_magazine_free_pfns(cpu_rcache->prev, iovad); | |
1042 | spin_unlock_irqrestore(&cpu_rcache->lock, flags); | |
1043 | } | |
1044 | } | |
1045 | ||
15bbdec3 SA |
1046 | MODULE_AUTHOR("Anil S Keshavamurthy <anil.s.keshavamurthy@intel.com>"); |
1047 | MODULE_LICENSE("GPL"); |