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ad9a8612 JF |
1 | /****************************************************************************** |
2 | * grant_table.c | |
3 | * | |
4 | * Granting foreign access to our memory reservation. | |
5 | * | |
6 | * Copyright (c) 2005-2006, Christopher Clark | |
7 | * Copyright (c) 2004-2005, K A Fraser | |
8 | * | |
9 | * This program is free software; you can redistribute it and/or | |
10 | * modify it under the terms of the GNU General Public License version 2 | |
11 | * as published by the Free Software Foundation; or, when distributed | |
12 | * separately from the Linux kernel or incorporated into other | |
13 | * software packages, subject to the following license: | |
14 | * | |
15 | * Permission is hereby granted, free of charge, to any person obtaining a copy | |
16 | * of this source file (the "Software"), to deal in the Software without | |
17 | * restriction, including without limitation the rights to use, copy, modify, | |
18 | * merge, publish, distribute, sublicense, and/or sell copies of the Software, | |
19 | * and to permit persons to whom the Software is furnished to do so, subject to | |
20 | * the following conditions: | |
21 | * | |
22 | * The above copyright notice and this permission notice shall be included in | |
23 | * all copies or substantial portions of the Software. | |
24 | * | |
25 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR | |
26 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | |
27 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE | |
28 | * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER | |
29 | * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING | |
30 | * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS | |
31 | * IN THE SOFTWARE. | |
32 | */ | |
33 | ||
283c0972 JP |
34 | #define pr_fmt(fmt) "xen:" KBUILD_MODNAME ": " fmt |
35 | ||
ad9a8612 JF |
36 | #include <linux/module.h> |
37 | #include <linux/sched.h> | |
38 | #include <linux/mm.h> | |
5a0e3ad6 | 39 | #include <linux/slab.h> |
ad9a8612 JF |
40 | #include <linux/vmalloc.h> |
41 | #include <linux/uaccess.h> | |
183d03cc | 42 | #include <linux/io.h> |
c571898f | 43 | #include <linux/delay.h> |
f62805f1 | 44 | #include <linux/hardirq.h> |
ad9a8612 | 45 | |
1ccbf534 | 46 | #include <xen/xen.h> |
ad9a8612 JF |
47 | #include <xen/interface/xen.h> |
48 | #include <xen/page.h> | |
49 | #include <xen/grant_table.h> | |
183d03cc | 50 | #include <xen/interface/memory.h> |
85ff6acb | 51 | #include <xen/hvc-console.h> |
3d24bbd7 | 52 | #include <xen/swiotlb-xen.h> |
ff4b156f | 53 | #include <xen/balloon.h> |
ecbf29cd | 54 | #include <asm/xen/hypercall.h> |
4d9310e3 | 55 | #include <asm/xen/interface.h> |
ad9a8612 JF |
56 | |
57 | #include <asm/pgtable.h> | |
58 | #include <asm/sync_bitops.h> | |
59 | ||
ad9a8612 JF |
60 | /* External tools reserve first few grant table entries. */ |
61 | #define NR_RESERVED_ENTRIES 8 | |
62 | #define GNTTAB_LIST_END 0xffffffff | |
ad9a8612 JF |
63 | |
64 | static grant_ref_t **gnttab_list; | |
65 | static unsigned int nr_grant_frames; | |
ad9a8612 JF |
66 | static int gnttab_free_count; |
67 | static grant_ref_t gnttab_free_head; | |
68 | static DEFINE_SPINLOCK(gnttab_list_lock); | |
efaf30a3 | 69 | struct grant_frames xen_auto_xlat_grant_frames; |
ad9a8612 | 70 | |
0f9f5a95 AL |
71 | static union { |
72 | struct grant_entry_v1 *v1; | |
73 | void *addr; | |
74 | } gnttab_shared; | |
75 | ||
76 | /*This is a structure of function pointers for grant table*/ | |
77 | struct gnttab_ops { | |
78 | /* | |
9dbc71d5 AL |
79 | * Mapping a list of frames for storing grant entries. Frames parameter |
80 | * is used to store grant table address when grant table being setup, | |
81 | * nr_gframes is the number of frames to map grant table. Returning | |
82 | * GNTST_okay means success and negative value means failure. | |
0f9f5a95 | 83 | */ |
ef32f892 | 84 | int (*map_frames)(xen_pfn_t *frames, unsigned int nr_gframes); |
0f9f5a95 AL |
85 | /* |
86 | * Release a list of frames which are mapped in map_frames for grant | |
87 | * entry status. | |
88 | */ | |
89 | void (*unmap_frames)(void); | |
90 | /* | |
9dbc71d5 AL |
91 | * Introducing a valid entry into the grant table, granting the frame of |
92 | * this grant entry to domain for accessing or transfering. Ref | |
93 | * parameter is reference of this introduced grant entry, domid is id of | |
94 | * granted domain, frame is the page frame to be granted, and flags is | |
95 | * status of the grant entry to be updated. | |
0f9f5a95 | 96 | */ |
9dbc71d5 AL |
97 | void (*update_entry)(grant_ref_t ref, domid_t domid, |
98 | unsigned long frame, unsigned flags); | |
0f9f5a95 | 99 | /* |
9dbc71d5 AL |
100 | * Stop granting a grant entry to domain for accessing. Ref parameter is |
101 | * reference of a grant entry whose grant access will be stopped, | |
102 | * readonly is not in use in this function. If the grant entry is | |
0f9f5a95 AL |
103 | * currently mapped for reading or writing, just return failure(==0) |
104 | * directly and don't tear down the grant access. Otherwise, stop grant | |
105 | * access for this entry and return success(==1). | |
106 | */ | |
9dbc71d5 | 107 | int (*end_foreign_access_ref)(grant_ref_t ref, int readonly); |
0f9f5a95 | 108 | /* |
9dbc71d5 AL |
109 | * Stop granting a grant entry to domain for transfer. Ref parameter is |
110 | * reference of a grant entry whose grant transfer will be stopped. If | |
111 | * tranfer has not started, just reclaim the grant entry and return | |
112 | * failure(==0). Otherwise, wait for the transfer to complete and then | |
113 | * return the frame. | |
0f9f5a95 | 114 | */ |
9dbc71d5 | 115 | unsigned long (*end_foreign_transfer_ref)(grant_ref_t ref); |
0f9f5a95 | 116 | /* |
9dbc71d5 | 117 | * Query the status of a grant entry. Ref parameter is reference of |
0f9f5a95 AL |
118 | * queried grant entry, return value is the status of queried entry. |
119 | * Detailed status(writing/reading) can be gotten from the return value | |
120 | * by bit operations. | |
121 | */ | |
9dbc71d5 | 122 | int (*query_foreign_access)(grant_ref_t ref); |
0f9f5a95 AL |
123 | }; |
124 | ||
125 | static struct gnttab_ops *gnttab_interface; | |
126 | ||
127 | static int grant_table_version; | |
d0b4d64a | 128 | static int grefs_per_grant_frame; |
ad9a8612 JF |
129 | |
130 | static struct gnttab_free_callback *gnttab_free_callback_list; | |
131 | ||
132 | static int gnttab_expand(unsigned int req_entries); | |
133 | ||
134 | #define RPP (PAGE_SIZE / sizeof(grant_ref_t)) | |
85ff6acb | 135 | #define SPP (PAGE_SIZE / sizeof(grant_status_t)) |
ad9a8612 JF |
136 | |
137 | static inline grant_ref_t *__gnttab_entry(grant_ref_t entry) | |
138 | { | |
139 | return &gnttab_list[(entry) / RPP][(entry) % RPP]; | |
140 | } | |
141 | /* This can be used as an l-value */ | |
142 | #define gnttab_entry(entry) (*__gnttab_entry(entry)) | |
143 | ||
144 | static int get_free_entries(unsigned count) | |
145 | { | |
146 | unsigned long flags; | |
272800dc | 147 | int ref, rc = 0; |
ad9a8612 JF |
148 | grant_ref_t head; |
149 | ||
150 | spin_lock_irqsave(&gnttab_list_lock, flags); | |
151 | ||
152 | if ((gnttab_free_count < count) && | |
153 | ((rc = gnttab_expand(count - gnttab_free_count)) < 0)) { | |
154 | spin_unlock_irqrestore(&gnttab_list_lock, flags); | |
155 | return rc; | |
156 | } | |
157 | ||
158 | ref = head = gnttab_free_head; | |
159 | gnttab_free_count -= count; | |
160 | while (count-- > 1) | |
161 | head = gnttab_entry(head); | |
162 | gnttab_free_head = gnttab_entry(head); | |
163 | gnttab_entry(head) = GNTTAB_LIST_END; | |
164 | ||
165 | spin_unlock_irqrestore(&gnttab_list_lock, flags); | |
166 | ||
167 | return ref; | |
168 | } | |
169 | ||
170 | static void do_free_callbacks(void) | |
171 | { | |
172 | struct gnttab_free_callback *callback, *next; | |
173 | ||
174 | callback = gnttab_free_callback_list; | |
175 | gnttab_free_callback_list = NULL; | |
176 | ||
177 | while (callback != NULL) { | |
178 | next = callback->next; | |
179 | if (gnttab_free_count >= callback->count) { | |
180 | callback->next = NULL; | |
181 | callback->fn(callback->arg); | |
182 | } else { | |
183 | callback->next = gnttab_free_callback_list; | |
184 | gnttab_free_callback_list = callback; | |
185 | } | |
186 | callback = next; | |
187 | } | |
188 | } | |
189 | ||
190 | static inline void check_free_callbacks(void) | |
191 | { | |
192 | if (unlikely(gnttab_free_callback_list)) | |
193 | do_free_callbacks(); | |
194 | } | |
195 | ||
196 | static void put_free_entry(grant_ref_t ref) | |
197 | { | |
198 | unsigned long flags; | |
199 | spin_lock_irqsave(&gnttab_list_lock, flags); | |
200 | gnttab_entry(ref) = gnttab_free_head; | |
201 | gnttab_free_head = ref; | |
202 | gnttab_free_count++; | |
203 | check_free_callbacks(); | |
204 | spin_unlock_irqrestore(&gnttab_list_lock, flags); | |
205 | } | |
206 | ||
0f9f5a95 | 207 | /* |
438b33c7 | 208 | * Following applies to gnttab_update_entry_v1. |
0f9f5a95 AL |
209 | * Introducing a valid entry into the grant table: |
210 | * 1. Write ent->domid. | |
211 | * 2. Write ent->frame: | |
212 | * GTF_permit_access: Frame to which access is permitted. | |
213 | * GTF_accept_transfer: Pseudo-phys frame slot being filled by new | |
214 | * frame, or zero if none. | |
215 | * 3. Write memory barrier (WMB). | |
216 | * 4. Write ent->flags, inc. valid type. | |
217 | */ | |
218 | static void gnttab_update_entry_v1(grant_ref_t ref, domid_t domid, | |
219 | unsigned long frame, unsigned flags) | |
ad9a8612 | 220 | { |
0f9f5a95 AL |
221 | gnttab_shared.v1[ref].domid = domid; |
222 | gnttab_shared.v1[ref].frame = frame; | |
ad9a8612 | 223 | wmb(); |
0f9f5a95 | 224 | gnttab_shared.v1[ref].flags = flags; |
ad9a8612 JF |
225 | } |
226 | ||
227 | /* | |
228 | * Public grant-issuing interface functions | |
229 | */ | |
230 | void gnttab_grant_foreign_access_ref(grant_ref_t ref, domid_t domid, | |
231 | unsigned long frame, int readonly) | |
232 | { | |
0f9f5a95 | 233 | gnttab_interface->update_entry(ref, domid, frame, |
ad9a8612 JF |
234 | GTF_permit_access | (readonly ? GTF_readonly : 0)); |
235 | } | |
236 | EXPORT_SYMBOL_GPL(gnttab_grant_foreign_access_ref); | |
237 | ||
238 | int gnttab_grant_foreign_access(domid_t domid, unsigned long frame, | |
239 | int readonly) | |
240 | { | |
241 | int ref; | |
242 | ||
243 | ref = get_free_entries(1); | |
244 | if (unlikely(ref < 0)) | |
245 | return -ENOSPC; | |
246 | ||
247 | gnttab_grant_foreign_access_ref(ref, domid, frame, readonly); | |
248 | ||
249 | return ref; | |
250 | } | |
251 | EXPORT_SYMBOL_GPL(gnttab_grant_foreign_access); | |
252 | ||
0f9f5a95 | 253 | static int gnttab_query_foreign_access_v1(grant_ref_t ref) |
ad9a8612 | 254 | { |
0f9f5a95 AL |
255 | return gnttab_shared.v1[ref].flags & (GTF_reading|GTF_writing); |
256 | } | |
ad9a8612 | 257 | |
0f9f5a95 AL |
258 | int gnttab_query_foreign_access(grant_ref_t ref) |
259 | { | |
260 | return gnttab_interface->query_foreign_access(ref); | |
ad9a8612 JF |
261 | } |
262 | EXPORT_SYMBOL_GPL(gnttab_query_foreign_access); | |
263 | ||
0f9f5a95 | 264 | static int gnttab_end_foreign_access_ref_v1(grant_ref_t ref, int readonly) |
ad9a8612 JF |
265 | { |
266 | u16 flags, nflags; | |
b1e495b2 | 267 | u16 *pflags; |
ad9a8612 | 268 | |
b1e495b2 AL |
269 | pflags = &gnttab_shared.v1[ref].flags; |
270 | nflags = *pflags; | |
ad9a8612 JF |
271 | do { |
272 | flags = nflags; | |
569ca5b3 | 273 | if (flags & (GTF_reading|GTF_writing)) |
ad9a8612 | 274 | return 0; |
b1e495b2 | 275 | } while ((nflags = sync_cmpxchg(pflags, flags, 0)) != flags); |
ad9a8612 JF |
276 | |
277 | return 1; | |
278 | } | |
0f9f5a95 | 279 | |
569ca5b3 | 280 | static inline int _gnttab_end_foreign_access_ref(grant_ref_t ref, int readonly) |
0f9f5a95 AL |
281 | { |
282 | return gnttab_interface->end_foreign_access_ref(ref, readonly); | |
283 | } | |
569ca5b3 JB |
284 | |
285 | int gnttab_end_foreign_access_ref(grant_ref_t ref, int readonly) | |
286 | { | |
287 | if (_gnttab_end_foreign_access_ref(ref, readonly)) | |
288 | return 1; | |
289 | pr_warn("WARNING: g.e. %#x still in use!\n", ref); | |
290 | return 0; | |
291 | } | |
ad9a8612 JF |
292 | EXPORT_SYMBOL_GPL(gnttab_end_foreign_access_ref); |
293 | ||
569ca5b3 JB |
294 | struct deferred_entry { |
295 | struct list_head list; | |
296 | grant_ref_t ref; | |
297 | bool ro; | |
298 | uint16_t warn_delay; | |
299 | struct page *page; | |
300 | }; | |
301 | static LIST_HEAD(deferred_list); | |
302 | static void gnttab_handle_deferred(unsigned long); | |
303 | static DEFINE_TIMER(deferred_timer, gnttab_handle_deferred, 0, 0); | |
304 | ||
305 | static void gnttab_handle_deferred(unsigned long unused) | |
306 | { | |
307 | unsigned int nr = 10; | |
308 | struct deferred_entry *first = NULL; | |
309 | unsigned long flags; | |
310 | ||
311 | spin_lock_irqsave(&gnttab_list_lock, flags); | |
312 | while (nr--) { | |
313 | struct deferred_entry *entry | |
314 | = list_first_entry(&deferred_list, | |
315 | struct deferred_entry, list); | |
316 | ||
317 | if (entry == first) | |
318 | break; | |
319 | list_del(&entry->list); | |
320 | spin_unlock_irqrestore(&gnttab_list_lock, flags); | |
321 | if (_gnttab_end_foreign_access_ref(entry->ref, entry->ro)) { | |
322 | put_free_entry(entry->ref); | |
323 | if (entry->page) { | |
324 | pr_debug("freeing g.e. %#x (pfn %#lx)\n", | |
325 | entry->ref, page_to_pfn(entry->page)); | |
326 | __free_page(entry->page); | |
327 | } else | |
328 | pr_info("freeing g.e. %#x\n", entry->ref); | |
329 | kfree(entry); | |
330 | entry = NULL; | |
331 | } else { | |
332 | if (!--entry->warn_delay) | |
283c0972 | 333 | pr_info("g.e. %#x still pending\n", entry->ref); |
569ca5b3 JB |
334 | if (!first) |
335 | first = entry; | |
336 | } | |
337 | spin_lock_irqsave(&gnttab_list_lock, flags); | |
338 | if (entry) | |
339 | list_add_tail(&entry->list, &deferred_list); | |
340 | else if (list_empty(&deferred_list)) | |
341 | break; | |
342 | } | |
343 | if (!list_empty(&deferred_list) && !timer_pending(&deferred_timer)) { | |
344 | deferred_timer.expires = jiffies + HZ; | |
345 | add_timer(&deferred_timer); | |
346 | } | |
347 | spin_unlock_irqrestore(&gnttab_list_lock, flags); | |
348 | } | |
349 | ||
350 | static void gnttab_add_deferred(grant_ref_t ref, bool readonly, | |
351 | struct page *page) | |
352 | { | |
353 | struct deferred_entry *entry = kmalloc(sizeof(*entry), GFP_ATOMIC); | |
354 | const char *what = KERN_WARNING "leaking"; | |
355 | ||
356 | if (entry) { | |
357 | unsigned long flags; | |
358 | ||
359 | entry->ref = ref; | |
360 | entry->ro = readonly; | |
361 | entry->page = page; | |
362 | entry->warn_delay = 60; | |
363 | spin_lock_irqsave(&gnttab_list_lock, flags); | |
364 | list_add_tail(&entry->list, &deferred_list); | |
365 | if (!timer_pending(&deferred_timer)) { | |
366 | deferred_timer.expires = jiffies + HZ; | |
367 | add_timer(&deferred_timer); | |
368 | } | |
369 | spin_unlock_irqrestore(&gnttab_list_lock, flags); | |
370 | what = KERN_DEBUG "deferring"; | |
371 | } | |
372 | printk("%s g.e. %#x (pfn %#lx)\n", | |
373 | what, ref, page ? page_to_pfn(page) : -1); | |
374 | } | |
375 | ||
ad9a8612 JF |
376 | void gnttab_end_foreign_access(grant_ref_t ref, int readonly, |
377 | unsigned long page) | |
378 | { | |
379 | if (gnttab_end_foreign_access_ref(ref, readonly)) { | |
380 | put_free_entry(ref); | |
381 | if (page != 0) | |
382 | free_page(page); | |
569ca5b3 JB |
383 | } else |
384 | gnttab_add_deferred(ref, readonly, | |
385 | page ? virt_to_page(page) : NULL); | |
ad9a8612 JF |
386 | } |
387 | EXPORT_SYMBOL_GPL(gnttab_end_foreign_access); | |
388 | ||
389 | int gnttab_grant_foreign_transfer(domid_t domid, unsigned long pfn) | |
390 | { | |
391 | int ref; | |
392 | ||
393 | ref = get_free_entries(1); | |
394 | if (unlikely(ref < 0)) | |
395 | return -ENOSPC; | |
396 | gnttab_grant_foreign_transfer_ref(ref, domid, pfn); | |
397 | ||
398 | return ref; | |
399 | } | |
400 | EXPORT_SYMBOL_GPL(gnttab_grant_foreign_transfer); | |
401 | ||
402 | void gnttab_grant_foreign_transfer_ref(grant_ref_t ref, domid_t domid, | |
403 | unsigned long pfn) | |
404 | { | |
0f9f5a95 | 405 | gnttab_interface->update_entry(ref, domid, pfn, GTF_accept_transfer); |
ad9a8612 JF |
406 | } |
407 | EXPORT_SYMBOL_GPL(gnttab_grant_foreign_transfer_ref); | |
408 | ||
0f9f5a95 | 409 | static unsigned long gnttab_end_foreign_transfer_ref_v1(grant_ref_t ref) |
ad9a8612 JF |
410 | { |
411 | unsigned long frame; | |
412 | u16 flags; | |
b1e495b2 AL |
413 | u16 *pflags; |
414 | ||
415 | pflags = &gnttab_shared.v1[ref].flags; | |
ad9a8612 JF |
416 | |
417 | /* | |
418 | * If a transfer is not even yet started, try to reclaim the grant | |
419 | * reference and return failure (== 0). | |
420 | */ | |
b1e495b2 AL |
421 | while (!((flags = *pflags) & GTF_transfer_committed)) { |
422 | if (sync_cmpxchg(pflags, flags, 0) == flags) | |
ad9a8612 JF |
423 | return 0; |
424 | cpu_relax(); | |
425 | } | |
426 | ||
427 | /* If a transfer is in progress then wait until it is completed. */ | |
428 | while (!(flags & GTF_transfer_completed)) { | |
b1e495b2 | 429 | flags = *pflags; |
ad9a8612 JF |
430 | cpu_relax(); |
431 | } | |
432 | ||
433 | rmb(); /* Read the frame number /after/ reading completion status. */ | |
0f9f5a95 | 434 | frame = gnttab_shared.v1[ref].frame; |
ad9a8612 JF |
435 | BUG_ON(frame == 0); |
436 | ||
437 | return frame; | |
438 | } | |
0f9f5a95 AL |
439 | |
440 | unsigned long gnttab_end_foreign_transfer_ref(grant_ref_t ref) | |
441 | { | |
442 | return gnttab_interface->end_foreign_transfer_ref(ref); | |
443 | } | |
ad9a8612 JF |
444 | EXPORT_SYMBOL_GPL(gnttab_end_foreign_transfer_ref); |
445 | ||
446 | unsigned long gnttab_end_foreign_transfer(grant_ref_t ref) | |
447 | { | |
448 | unsigned long frame = gnttab_end_foreign_transfer_ref(ref); | |
449 | put_free_entry(ref); | |
450 | return frame; | |
451 | } | |
452 | EXPORT_SYMBOL_GPL(gnttab_end_foreign_transfer); | |
453 | ||
454 | void gnttab_free_grant_reference(grant_ref_t ref) | |
455 | { | |
456 | put_free_entry(ref); | |
457 | } | |
458 | EXPORT_SYMBOL_GPL(gnttab_free_grant_reference); | |
459 | ||
460 | void gnttab_free_grant_references(grant_ref_t head) | |
461 | { | |
462 | grant_ref_t ref; | |
463 | unsigned long flags; | |
464 | int count = 1; | |
465 | if (head == GNTTAB_LIST_END) | |
466 | return; | |
467 | spin_lock_irqsave(&gnttab_list_lock, flags); | |
468 | ref = head; | |
469 | while (gnttab_entry(ref) != GNTTAB_LIST_END) { | |
470 | ref = gnttab_entry(ref); | |
471 | count++; | |
472 | } | |
473 | gnttab_entry(ref) = gnttab_free_head; | |
474 | gnttab_free_head = head; | |
475 | gnttab_free_count += count; | |
476 | check_free_callbacks(); | |
477 | spin_unlock_irqrestore(&gnttab_list_lock, flags); | |
478 | } | |
479 | EXPORT_SYMBOL_GPL(gnttab_free_grant_references); | |
480 | ||
481 | int gnttab_alloc_grant_references(u16 count, grant_ref_t *head) | |
482 | { | |
483 | int h = get_free_entries(count); | |
484 | ||
485 | if (h < 0) | |
486 | return -ENOSPC; | |
487 | ||
488 | *head = h; | |
489 | ||
490 | return 0; | |
491 | } | |
492 | EXPORT_SYMBOL_GPL(gnttab_alloc_grant_references); | |
493 | ||
494 | int gnttab_empty_grant_references(const grant_ref_t *private_head) | |
495 | { | |
496 | return (*private_head == GNTTAB_LIST_END); | |
497 | } | |
498 | EXPORT_SYMBOL_GPL(gnttab_empty_grant_references); | |
499 | ||
500 | int gnttab_claim_grant_reference(grant_ref_t *private_head) | |
501 | { | |
502 | grant_ref_t g = *private_head; | |
503 | if (unlikely(g == GNTTAB_LIST_END)) | |
504 | return -ENOSPC; | |
505 | *private_head = gnttab_entry(g); | |
506 | return g; | |
507 | } | |
508 | EXPORT_SYMBOL_GPL(gnttab_claim_grant_reference); | |
509 | ||
510 | void gnttab_release_grant_reference(grant_ref_t *private_head, | |
511 | grant_ref_t release) | |
512 | { | |
513 | gnttab_entry(release) = *private_head; | |
514 | *private_head = release; | |
515 | } | |
516 | EXPORT_SYMBOL_GPL(gnttab_release_grant_reference); | |
517 | ||
518 | void gnttab_request_free_callback(struct gnttab_free_callback *callback, | |
519 | void (*fn)(void *), void *arg, u16 count) | |
520 | { | |
521 | unsigned long flags; | |
5f338d90 RPM |
522 | struct gnttab_free_callback *cb; |
523 | ||
ad9a8612 | 524 | spin_lock_irqsave(&gnttab_list_lock, flags); |
5f338d90 RPM |
525 | |
526 | /* Check if the callback is already on the list */ | |
527 | cb = gnttab_free_callback_list; | |
528 | while (cb) { | |
529 | if (cb == callback) | |
530 | goto out; | |
531 | cb = cb->next; | |
532 | } | |
533 | ||
ad9a8612 JF |
534 | callback->fn = fn; |
535 | callback->arg = arg; | |
536 | callback->count = count; | |
537 | callback->next = gnttab_free_callback_list; | |
538 | gnttab_free_callback_list = callback; | |
539 | check_free_callbacks(); | |
540 | out: | |
541 | spin_unlock_irqrestore(&gnttab_list_lock, flags); | |
542 | } | |
543 | EXPORT_SYMBOL_GPL(gnttab_request_free_callback); | |
544 | ||
545 | void gnttab_cancel_free_callback(struct gnttab_free_callback *callback) | |
546 | { | |
547 | struct gnttab_free_callback **pcb; | |
548 | unsigned long flags; | |
549 | ||
550 | spin_lock_irqsave(&gnttab_list_lock, flags); | |
551 | for (pcb = &gnttab_free_callback_list; *pcb; pcb = &(*pcb)->next) { | |
552 | if (*pcb == callback) { | |
553 | *pcb = callback->next; | |
554 | break; | |
555 | } | |
556 | } | |
557 | spin_unlock_irqrestore(&gnttab_list_lock, flags); | |
558 | } | |
559 | EXPORT_SYMBOL_GPL(gnttab_cancel_free_callback); | |
560 | ||
561 | static int grow_gnttab_list(unsigned int more_frames) | |
562 | { | |
563 | unsigned int new_nr_grant_frames, extra_entries, i; | |
bbc60c18 | 564 | unsigned int nr_glist_frames, new_nr_glist_frames; |
ad9a8612 | 565 | |
d0b4d64a MW |
566 | BUG_ON(grefs_per_grant_frame == 0); |
567 | ||
ad9a8612 | 568 | new_nr_grant_frames = nr_grant_frames + more_frames; |
d0b4d64a | 569 | extra_entries = more_frames * grefs_per_grant_frame; |
ad9a8612 | 570 | |
d0b4d64a | 571 | nr_glist_frames = (nr_grant_frames * grefs_per_grant_frame + RPP - 1) / RPP; |
bbc60c18 | 572 | new_nr_glist_frames = |
d0b4d64a | 573 | (new_nr_grant_frames * grefs_per_grant_frame + RPP - 1) / RPP; |
bbc60c18 | 574 | for (i = nr_glist_frames; i < new_nr_glist_frames; i++) { |
ad9a8612 JF |
575 | gnttab_list[i] = (grant_ref_t *)__get_free_page(GFP_ATOMIC); |
576 | if (!gnttab_list[i]) | |
577 | goto grow_nomem; | |
578 | } | |
579 | ||
580 | ||
d0b4d64a MW |
581 | for (i = grefs_per_grant_frame * nr_grant_frames; |
582 | i < grefs_per_grant_frame * new_nr_grant_frames - 1; i++) | |
ad9a8612 JF |
583 | gnttab_entry(i) = i + 1; |
584 | ||
585 | gnttab_entry(i) = gnttab_free_head; | |
d0b4d64a | 586 | gnttab_free_head = grefs_per_grant_frame * nr_grant_frames; |
ad9a8612 JF |
587 | gnttab_free_count += extra_entries; |
588 | ||
589 | nr_grant_frames = new_nr_grant_frames; | |
590 | ||
591 | check_free_callbacks(); | |
592 | ||
593 | return 0; | |
594 | ||
595 | grow_nomem: | |
46e3626a | 596 | while (i-- > nr_glist_frames) |
ad9a8612 JF |
597 | free_page((unsigned long) gnttab_list[i]); |
598 | return -ENOMEM; | |
599 | } | |
600 | ||
601 | static unsigned int __max_nr_grant_frames(void) | |
602 | { | |
603 | struct gnttab_query_size query; | |
604 | int rc; | |
605 | ||
606 | query.dom = DOMID_SELF; | |
607 | ||
608 | rc = HYPERVISOR_grant_table_op(GNTTABOP_query_size, &query, 1); | |
609 | if ((rc < 0) || (query.status != GNTST_okay)) | |
610 | return 4; /* Legacy max supported number of frames */ | |
611 | ||
612 | return query.max_nr_frames; | |
613 | } | |
614 | ||
183d03cc | 615 | unsigned int gnttab_max_grant_frames(void) |
ad9a8612 JF |
616 | { |
617 | unsigned int xen_max = __max_nr_grant_frames(); | |
7f256020 KRW |
618 | static unsigned int boot_max_nr_grant_frames; |
619 | ||
620 | /* First time, initialize it properly. */ | |
621 | if (!boot_max_nr_grant_frames) | |
622 | boot_max_nr_grant_frames = __max_nr_grant_frames(); | |
ad9a8612 JF |
623 | |
624 | if (xen_max > boot_max_nr_grant_frames) | |
625 | return boot_max_nr_grant_frames; | |
626 | return xen_max; | |
627 | } | |
183d03cc | 628 | EXPORT_SYMBOL_GPL(gnttab_max_grant_frames); |
ad9a8612 | 629 | |
47c54205 | 630 | int gnttab_setup_auto_xlat_frames(phys_addr_t addr) |
efaf30a3 KRW |
631 | { |
632 | xen_pfn_t *pfn; | |
633 | unsigned int max_nr_gframes = __max_nr_grant_frames(); | |
634 | unsigned int i; | |
635 | void *vaddr; | |
636 | ||
637 | if (xen_auto_xlat_grant_frames.count) | |
638 | return -EINVAL; | |
639 | ||
640 | vaddr = xen_remap(addr, PAGE_SIZE * max_nr_gframes); | |
641 | if (vaddr == NULL) { | |
47c54205 JG |
642 | pr_warn("Failed to ioremap gnttab share frames (addr=%pa)!\n", |
643 | &addr); | |
efaf30a3 KRW |
644 | return -ENOMEM; |
645 | } | |
646 | pfn = kcalloc(max_nr_gframes, sizeof(pfn[0]), GFP_KERNEL); | |
647 | if (!pfn) { | |
648 | xen_unmap(vaddr); | |
649 | return -ENOMEM; | |
650 | } | |
651 | for (i = 0; i < max_nr_gframes; i++) | |
652 | pfn[i] = PFN_DOWN(addr) + i; | |
653 | ||
654 | xen_auto_xlat_grant_frames.vaddr = vaddr; | |
655 | xen_auto_xlat_grant_frames.pfn = pfn; | |
656 | xen_auto_xlat_grant_frames.count = max_nr_gframes; | |
657 | ||
658 | return 0; | |
659 | } | |
660 | EXPORT_SYMBOL_GPL(gnttab_setup_auto_xlat_frames); | |
661 | ||
662 | void gnttab_free_auto_xlat_frames(void) | |
663 | { | |
664 | if (!xen_auto_xlat_grant_frames.count) | |
665 | return; | |
666 | kfree(xen_auto_xlat_grant_frames.pfn); | |
667 | xen_unmap(xen_auto_xlat_grant_frames.vaddr); | |
668 | ||
669 | xen_auto_xlat_grant_frames.pfn = NULL; | |
670 | xen_auto_xlat_grant_frames.count = 0; | |
671 | xen_auto_xlat_grant_frames.vaddr = NULL; | |
672 | } | |
673 | EXPORT_SYMBOL_GPL(gnttab_free_auto_xlat_frames); | |
674 | ||
ff4b156f DV |
675 | /** |
676 | * gnttab_alloc_pages - alloc pages suitable for grant mapping into | |
677 | * @nr_pages: number of pages to alloc | |
678 | * @pages: returns the pages | |
679 | */ | |
680 | int gnttab_alloc_pages(int nr_pages, struct page **pages) | |
681 | { | |
682 | int ret; | |
683 | ||
684 | ret = alloc_xenballooned_pages(nr_pages, pages, false); | |
685 | if (ret < 0) | |
686 | return ret; | |
687 | ||
688 | return 0; | |
689 | } | |
690 | EXPORT_SYMBOL(gnttab_alloc_pages); | |
691 | ||
692 | /** | |
693 | * gnttab_free_pages - free pages allocated by gnttab_alloc_pages() | |
694 | * @nr_pages; number of pages to free | |
695 | * @pages: the pages | |
696 | */ | |
697 | void gnttab_free_pages(int nr_pages, struct page **pages) | |
698 | { | |
699 | free_xenballooned_pages(nr_pages, pages); | |
700 | } | |
701 | EXPORT_SYMBOL(gnttab_free_pages); | |
702 | ||
c571898f ALC |
703 | /* Handling of paged out grant targets (GNTST_eagain) */ |
704 | #define MAX_DELAY 256 | |
705 | static inline void | |
706 | gnttab_retry_eagain_gop(unsigned int cmd, void *gop, int16_t *status, | |
707 | const char *func) | |
708 | { | |
709 | unsigned delay = 1; | |
710 | ||
711 | do { | |
712 | BUG_ON(HYPERVISOR_grant_table_op(cmd, gop, 1)); | |
713 | if (*status == GNTST_eagain) | |
714 | msleep(delay++); | |
715 | } while ((*status == GNTST_eagain) && (delay < MAX_DELAY)); | |
716 | ||
717 | if (delay >= MAX_DELAY) { | |
283c0972 | 718 | pr_err("%s: %s eagain grant\n", func, current->comm); |
c571898f ALC |
719 | *status = GNTST_bad_page; |
720 | } | |
721 | } | |
722 | ||
723 | void gnttab_batch_map(struct gnttab_map_grant_ref *batch, unsigned count) | |
724 | { | |
725 | struct gnttab_map_grant_ref *op; | |
726 | ||
727 | if (HYPERVISOR_grant_table_op(GNTTABOP_map_grant_ref, batch, count)) | |
728 | BUG(); | |
729 | for (op = batch; op < batch + count; op++) | |
730 | if (op->status == GNTST_eagain) | |
731 | gnttab_retry_eagain_gop(GNTTABOP_map_grant_ref, op, | |
732 | &op->status, __func__); | |
733 | } | |
734 | EXPORT_SYMBOL_GPL(gnttab_batch_map); | |
735 | ||
736 | void gnttab_batch_copy(struct gnttab_copy *batch, unsigned count) | |
737 | { | |
738 | struct gnttab_copy *op; | |
739 | ||
740 | if (HYPERVISOR_grant_table_op(GNTTABOP_copy, batch, count)) | |
741 | BUG(); | |
742 | for (op = batch; op < batch + count; op++) | |
743 | if (op->status == GNTST_eagain) | |
744 | gnttab_retry_eagain_gop(GNTTABOP_copy, op, | |
745 | &op->status, __func__); | |
746 | } | |
747 | EXPORT_SYMBOL_GPL(gnttab_batch_copy); | |
748 | ||
e85fc980 | 749 | int gnttab_map_refs(struct gnttab_map_grant_ref *map_ops, |
c123799a | 750 | struct gnttab_map_grant_ref *kmap_ops, |
e85fc980 | 751 | struct page **pages, unsigned int count) |
289b777e SS |
752 | { |
753 | int i, ret; | |
289b777e SS |
754 | |
755 | ret = HYPERVISOR_grant_table_op(GNTTABOP_map_grant_ref, map_ops, count); | |
87f1d40a JF |
756 | if (ret) |
757 | return ret; | |
289b777e | 758 | |
c571898f ALC |
759 | /* Retry eagain maps */ |
760 | for (i = 0; i < count; i++) | |
761 | if (map_ops[i].status == GNTST_eagain) | |
762 | gnttab_retry_eagain_gop(GNTTABOP_map_grant_ref, map_ops + i, | |
763 | &map_ops[i].status, __func__); | |
764 | ||
1429d46d | 765 | return set_foreign_p2m_mapping(map_ops, kmap_ops, pages, count); |
289b777e SS |
766 | } |
767 | EXPORT_SYMBOL_GPL(gnttab_map_refs); | |
768 | ||
e85fc980 | 769 | int gnttab_unmap_refs(struct gnttab_unmap_grant_ref *unmap_ops, |
853d0289 | 770 | struct gnttab_unmap_grant_ref *kunmap_ops, |
e85fc980 | 771 | struct page **pages, unsigned int count) |
289b777e | 772 | { |
1429d46d | 773 | int ret; |
289b777e SS |
774 | |
775 | ret = HYPERVISOR_grant_table_op(GNTTABOP_unmap_grant_ref, unmap_ops, count); | |
87f1d40a JF |
776 | if (ret) |
777 | return ret; | |
778 | ||
853d0289 | 779 | return clear_foreign_p2m_mapping(unmap_ops, kunmap_ops, pages, count); |
289b777e SS |
780 | } |
781 | EXPORT_SYMBOL_GPL(gnttab_unmap_refs); | |
782 | ||
ef32f892 | 783 | static int gnttab_map_frames_v1(xen_pfn_t *frames, unsigned int nr_gframes) |
0f9f5a95 AL |
784 | { |
785 | int rc; | |
786 | ||
787 | rc = arch_gnttab_map_shared(frames, nr_gframes, | |
788 | gnttab_max_grant_frames(), | |
789 | &gnttab_shared.addr); | |
790 | BUG_ON(rc); | |
791 | ||
792 | return 0; | |
793 | } | |
794 | ||
795 | static void gnttab_unmap_frames_v1(void) | |
796 | { | |
85ff6acb AL |
797 | arch_gnttab_unmap(gnttab_shared.addr, nr_grant_frames); |
798 | } | |
799 | ||
ad9a8612 JF |
800 | static int gnttab_map(unsigned int start_idx, unsigned int end_idx) |
801 | { | |
802 | struct gnttab_setup_table setup; | |
ef32f892 | 803 | xen_pfn_t *frames; |
ad9a8612 JF |
804 | unsigned int nr_gframes = end_idx + 1; |
805 | int rc; | |
806 | ||
6926f6d6 | 807 | if (xen_feature(XENFEAT_auto_translated_physmap)) { |
183d03cc SS |
808 | struct xen_add_to_physmap xatp; |
809 | unsigned int i = end_idx; | |
810 | rc = 0; | |
efaf30a3 | 811 | BUG_ON(xen_auto_xlat_grant_frames.count < nr_gframes); |
183d03cc SS |
812 | /* |
813 | * Loop backwards, so that the first hypercall has the largest | |
814 | * index, ensuring that the table will grow only once. | |
815 | */ | |
816 | do { | |
817 | xatp.domid = DOMID_SELF; | |
818 | xatp.idx = i; | |
819 | xatp.space = XENMAPSPACE_grant_table; | |
efaf30a3 | 820 | xatp.gpfn = xen_auto_xlat_grant_frames.pfn[i]; |
183d03cc SS |
821 | rc = HYPERVISOR_memory_op(XENMEM_add_to_physmap, &xatp); |
822 | if (rc != 0) { | |
283c0972 JP |
823 | pr_warn("grant table add_to_physmap failed, err=%d\n", |
824 | rc); | |
183d03cc SS |
825 | break; |
826 | } | |
827 | } while (i-- > start_idx); | |
828 | ||
829 | return rc; | |
830 | } | |
831 | ||
85ff6acb AL |
832 | /* No need for kzalloc as it is initialized in following hypercall |
833 | * GNTTABOP_setup_table. | |
834 | */ | |
ad9a8612 JF |
835 | frames = kmalloc(nr_gframes * sizeof(unsigned long), GFP_ATOMIC); |
836 | if (!frames) | |
837 | return -ENOMEM; | |
838 | ||
839 | setup.dom = DOMID_SELF; | |
840 | setup.nr_frames = nr_gframes; | |
87e27cf6 | 841 | set_xen_guest_handle(setup.frame_list, frames); |
ad9a8612 JF |
842 | |
843 | rc = HYPERVISOR_grant_table_op(GNTTABOP_setup_table, &setup, 1); | |
844 | if (rc == -ENOSYS) { | |
845 | kfree(frames); | |
846 | return -ENOSYS; | |
847 | } | |
848 | ||
849 | BUG_ON(rc || setup.status); | |
850 | ||
0f9f5a95 | 851 | rc = gnttab_interface->map_frames(frames, nr_gframes); |
ad9a8612 JF |
852 | |
853 | kfree(frames); | |
854 | ||
0f9f5a95 AL |
855 | return rc; |
856 | } | |
857 | ||
858 | static struct gnttab_ops gnttab_v1_ops = { | |
859 | .map_frames = gnttab_map_frames_v1, | |
860 | .unmap_frames = gnttab_unmap_frames_v1, | |
861 | .update_entry = gnttab_update_entry_v1, | |
862 | .end_foreign_access_ref = gnttab_end_foreign_access_ref_v1, | |
863 | .end_foreign_transfer_ref = gnttab_end_foreign_transfer_ref_v1, | |
864 | .query_foreign_access = gnttab_query_foreign_access_v1, | |
865 | }; | |
866 | ||
867 | static void gnttab_request_version(void) | |
868 | { | |
438b33c7 DV |
869 | /* Only version 1 is used, which will always be available. */ |
870 | grant_table_version = 1; | |
871 | grefs_per_grant_frame = PAGE_SIZE / sizeof(struct grant_entry_v1); | |
872 | gnttab_interface = &gnttab_v1_ops; | |
85ff6acb | 873 | |
283c0972 | 874 | pr_info("Grant tables using version %d layout\n", grant_table_version); |
ad9a8612 JF |
875 | } |
876 | ||
d0b4d64a | 877 | static int gnttab_setup(void) |
ad9a8612 | 878 | { |
183d03cc SS |
879 | unsigned int max_nr_gframes; |
880 | ||
881 | max_nr_gframes = gnttab_max_grant_frames(); | |
882 | if (max_nr_gframes < nr_grant_frames) | |
ad9a8612 | 883 | return -ENOSYS; |
183d03cc | 884 | |
45684753 | 885 | if (xen_feature(XENFEAT_auto_translated_physmap) && gnttab_shared.addr == NULL) { |
efaf30a3 | 886 | gnttab_shared.addr = xen_auto_xlat_grant_frames.vaddr; |
0f9f5a95 | 887 | if (gnttab_shared.addr == NULL) { |
efaf30a3 KRW |
888 | pr_warn("gnttab share frames (addr=0x%08lx) is not mapped!\n", |
889 | (unsigned long)xen_auto_xlat_grant_frames.vaddr); | |
183d03cc SS |
890 | return -ENOMEM; |
891 | } | |
892 | } | |
45684753 | 893 | return gnttab_map(0, nr_grant_frames - 1); |
ad9a8612 JF |
894 | } |
895 | ||
d0b4d64a MW |
896 | int gnttab_resume(void) |
897 | { | |
898 | gnttab_request_version(); | |
899 | return gnttab_setup(); | |
900 | } | |
901 | ||
0e91398f | 902 | int gnttab_suspend(void) |
ad9a8612 | 903 | { |
13cd36a3 DV |
904 | if (!xen_feature(XENFEAT_auto_translated_physmap)) |
905 | gnttab_interface->unmap_frames(); | |
ad9a8612 JF |
906 | return 0; |
907 | } | |
908 | ||
909 | static int gnttab_expand(unsigned int req_entries) | |
910 | { | |
911 | int rc; | |
912 | unsigned int cur, extra; | |
913 | ||
d0b4d64a | 914 | BUG_ON(grefs_per_grant_frame == 0); |
ad9a8612 | 915 | cur = nr_grant_frames; |
d0b4d64a MW |
916 | extra = ((req_entries + (grefs_per_grant_frame-1)) / |
917 | grefs_per_grant_frame); | |
183d03cc | 918 | if (cur + extra > gnttab_max_grant_frames()) |
ad9a8612 JF |
919 | return -ENOSPC; |
920 | ||
921 | rc = gnttab_map(cur, cur + extra - 1); | |
922 | if (rc == 0) | |
923 | rc = grow_gnttab_list(extra); | |
924 | ||
925 | return rc; | |
926 | } | |
927 | ||
183d03cc | 928 | int gnttab_init(void) |
ad9a8612 JF |
929 | { |
930 | int i; | |
162e3717 | 931 | unsigned long max_nr_grant_frames; |
bbc60c18 | 932 | unsigned int max_nr_glist_frames, nr_glist_frames; |
ad9a8612 | 933 | unsigned int nr_init_grefs; |
6b5e7d9e | 934 | int ret; |
ad9a8612 | 935 | |
d0b4d64a | 936 | gnttab_request_version(); |
162e3717 | 937 | max_nr_grant_frames = gnttab_max_grant_frames(); |
ad9a8612 | 938 | nr_grant_frames = 1; |
ad9a8612 JF |
939 | |
940 | /* Determine the maximum number of frames required for the | |
941 | * grant reference free list on the current hypervisor. | |
942 | */ | |
d0b4d64a | 943 | BUG_ON(grefs_per_grant_frame == 0); |
162e3717 | 944 | max_nr_glist_frames = (max_nr_grant_frames * |
d0b4d64a | 945 | grefs_per_grant_frame / RPP); |
ad9a8612 JF |
946 | |
947 | gnttab_list = kmalloc(max_nr_glist_frames * sizeof(grant_ref_t *), | |
948 | GFP_KERNEL); | |
949 | if (gnttab_list == NULL) | |
950 | return -ENOMEM; | |
951 | ||
d0b4d64a | 952 | nr_glist_frames = (nr_grant_frames * grefs_per_grant_frame + RPP - 1) / RPP; |
bbc60c18 | 953 | for (i = 0; i < nr_glist_frames; i++) { |
ad9a8612 | 954 | gnttab_list[i] = (grant_ref_t *)__get_free_page(GFP_KERNEL); |
6b5e7d9e JL |
955 | if (gnttab_list[i] == NULL) { |
956 | ret = -ENOMEM; | |
ad9a8612 | 957 | goto ini_nomem; |
6b5e7d9e | 958 | } |
ad9a8612 JF |
959 | } |
960 | ||
438b33c7 | 961 | ret = arch_gnttab_init(max_nr_grant_frames); |
162e3717 DV |
962 | if (ret < 0) |
963 | goto ini_nomem; | |
964 | ||
d0b4d64a | 965 | if (gnttab_setup() < 0) { |
6b5e7d9e JL |
966 | ret = -ENODEV; |
967 | goto ini_nomem; | |
968 | } | |
ad9a8612 | 969 | |
d0b4d64a | 970 | nr_init_grefs = nr_grant_frames * grefs_per_grant_frame; |
ad9a8612 JF |
971 | |
972 | for (i = NR_RESERVED_ENTRIES; i < nr_init_grefs - 1; i++) | |
973 | gnttab_entry(i) = i + 1; | |
974 | ||
975 | gnttab_entry(nr_init_grefs - 1) = GNTTAB_LIST_END; | |
976 | gnttab_free_count = nr_init_grefs - NR_RESERVED_ENTRIES; | |
977 | gnttab_free_head = NR_RESERVED_ENTRIES; | |
978 | ||
979 | printk("Grant table initialized\n"); | |
980 | return 0; | |
981 | ||
982 | ini_nomem: | |
983 | for (i--; i >= 0; i--) | |
984 | free_page((unsigned long)gnttab_list[i]); | |
985 | kfree(gnttab_list); | |
6b5e7d9e | 986 | return ret; |
ad9a8612 | 987 | } |
183d03cc SS |
988 | EXPORT_SYMBOL_GPL(gnttab_init); |
989 | ||
345a5255 | 990 | static int __gnttab_init(void) |
183d03cc SS |
991 | { |
992 | /* Delay grant-table initialization in the PV on HVM case */ | |
993 | if (xen_hvm_domain()) | |
994 | return 0; | |
995 | ||
996 | if (!xen_pv_domain()) | |
997 | return -ENODEV; | |
998 | ||
999 | return gnttab_init(); | |
1000 | } | |
6926f6d6 KRW |
1001 | /* Starts after core_initcall so that xen_pvh_gnttab_setup can be called |
1002 | * beforehand to initialize xen_auto_xlat_grant_frames. */ | |
1003 | core_initcall_sync(__gnttab_init); |