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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 | ||
57c8a661 | 36 | #include <linux/memblock.h> |
ad9a8612 JF |
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> |
3f9f1c67 | 45 | #include <linux/workqueue.h> |
29d11cfd | 46 | #include <linux/ratelimit.h> |
8dca4d96 | 47 | #include <linux/moduleparam.h> |
9bdc7304 OA |
48 | #ifdef CONFIG_XEN_GRANT_DMA_ALLOC |
49 | #include <linux/dma-mapping.h> | |
50 | #endif | |
ad9a8612 | 51 | |
1ccbf534 | 52 | #include <xen/xen.h> |
ad9a8612 JF |
53 | #include <xen/interface/xen.h> |
54 | #include <xen/page.h> | |
55 | #include <xen/grant_table.h> | |
183d03cc | 56 | #include <xen/interface/memory.h> |
85ff6acb | 57 | #include <xen/hvc-console.h> |
3d24bbd7 | 58 | #include <xen/swiotlb-xen.h> |
ff4b156f | 59 | #include <xen/balloon.h> |
8dca4d96 JG |
60 | #ifdef CONFIG_X86 |
61 | #include <asm/xen/cpuid.h> | |
62 | #endif | |
9bdc7304 | 63 | #include <xen/mem-reservation.h> |
ecbf29cd | 64 | #include <asm/xen/hypercall.h> |
4d9310e3 | 65 | #include <asm/xen/interface.h> |
ad9a8612 | 66 | |
ad9a8612 JF |
67 | #include <asm/sync_bitops.h> |
68 | ||
ad9a8612 JF |
69 | /* External tools reserve first few grant table entries. */ |
70 | #define NR_RESERVED_ENTRIES 8 | |
71 | #define GNTTAB_LIST_END 0xffffffff | |
ad9a8612 JF |
72 | |
73 | static grant_ref_t **gnttab_list; | |
74 | static unsigned int nr_grant_frames; | |
ad9a8612 JF |
75 | static int gnttab_free_count; |
76 | static grant_ref_t gnttab_free_head; | |
77 | static DEFINE_SPINLOCK(gnttab_list_lock); | |
efaf30a3 | 78 | struct grant_frames xen_auto_xlat_grant_frames; |
8dca4d96 JG |
79 | static unsigned int xen_gnttab_version; |
80 | module_param_named(version, xen_gnttab_version, uint, 0); | |
ad9a8612 | 81 | |
0f9f5a95 AL |
82 | static union { |
83 | struct grant_entry_v1 *v1; | |
b988b8ff | 84 | union grant_entry_v2 *v2; |
0f9f5a95 AL |
85 | void *addr; |
86 | } gnttab_shared; | |
87 | ||
88 | /*This is a structure of function pointers for grant table*/ | |
89 | struct gnttab_ops { | |
83c69324 JG |
90 | /* |
91 | * Version of the grant interface. | |
92 | */ | |
93 | unsigned int version; | |
94 | /* | |
95 | * Grant refs per grant frame. | |
96 | */ | |
97 | unsigned int grefs_per_grant_frame; | |
0f9f5a95 | 98 | /* |
9dbc71d5 AL |
99 | * Mapping a list of frames for storing grant entries. Frames parameter |
100 | * is used to store grant table address when grant table being setup, | |
101 | * nr_gframes is the number of frames to map grant table. Returning | |
102 | * GNTST_okay means success and negative value means failure. | |
0f9f5a95 | 103 | */ |
ef32f892 | 104 | int (*map_frames)(xen_pfn_t *frames, unsigned int nr_gframes); |
0f9f5a95 AL |
105 | /* |
106 | * Release a list of frames which are mapped in map_frames for grant | |
107 | * entry status. | |
108 | */ | |
109 | void (*unmap_frames)(void); | |
110 | /* | |
9dbc71d5 AL |
111 | * Introducing a valid entry into the grant table, granting the frame of |
112 | * this grant entry to domain for accessing or transfering. Ref | |
113 | * parameter is reference of this introduced grant entry, domid is id of | |
114 | * granted domain, frame is the page frame to be granted, and flags is | |
115 | * status of the grant entry to be updated. | |
0f9f5a95 | 116 | */ |
9dbc71d5 AL |
117 | void (*update_entry)(grant_ref_t ref, domid_t domid, |
118 | unsigned long frame, unsigned flags); | |
0f9f5a95 | 119 | /* |
9dbc71d5 AL |
120 | * Stop granting a grant entry to domain for accessing. Ref parameter is |
121 | * reference of a grant entry whose grant access will be stopped, | |
122 | * readonly is not in use in this function. If the grant entry is | |
0f9f5a95 AL |
123 | * currently mapped for reading or writing, just return failure(==0) |
124 | * directly and don't tear down the grant access. Otherwise, stop grant | |
125 | * access for this entry and return success(==1). | |
126 | */ | |
9dbc71d5 | 127 | int (*end_foreign_access_ref)(grant_ref_t ref, int readonly); |
0f9f5a95 | 128 | /* |
9dbc71d5 AL |
129 | * Stop granting a grant entry to domain for transfer. Ref parameter is |
130 | * reference of a grant entry whose grant transfer will be stopped. If | |
131 | * tranfer has not started, just reclaim the grant entry and return | |
132 | * failure(==0). Otherwise, wait for the transfer to complete and then | |
133 | * return the frame. | |
0f9f5a95 | 134 | */ |
9dbc71d5 | 135 | unsigned long (*end_foreign_transfer_ref)(grant_ref_t ref); |
42baefac JG |
136 | /* |
137 | * Read the frame number related to a given grant reference. | |
138 | */ | |
139 | unsigned long (*read_frame)(grant_ref_t ref); | |
0f9f5a95 AL |
140 | }; |
141 | ||
b44166cd BL |
142 | struct unmap_refs_callback_data { |
143 | struct completion completion; | |
144 | int result; | |
145 | }; | |
146 | ||
86fc2136 | 147 | static const struct gnttab_ops *gnttab_interface; |
0f9f5a95 | 148 | |
b988b8ff JG |
149 | /* This reflects status of grant entries, so act as a global value. */ |
150 | static grant_status_t *grstatus; | |
ad9a8612 JF |
151 | |
152 | static struct gnttab_free_callback *gnttab_free_callback_list; | |
153 | ||
154 | static int gnttab_expand(unsigned int req_entries); | |
155 | ||
156 | #define RPP (PAGE_SIZE / sizeof(grant_ref_t)) | |
b988b8ff | 157 | #define SPP (PAGE_SIZE / sizeof(grant_status_t)) |
ad9a8612 JF |
158 | |
159 | static inline grant_ref_t *__gnttab_entry(grant_ref_t entry) | |
160 | { | |
161 | return &gnttab_list[(entry) / RPP][(entry) % RPP]; | |
162 | } | |
163 | /* This can be used as an l-value */ | |
164 | #define gnttab_entry(entry) (*__gnttab_entry(entry)) | |
165 | ||
166 | static int get_free_entries(unsigned count) | |
167 | { | |
168 | unsigned long flags; | |
272800dc | 169 | int ref, rc = 0; |
ad9a8612 JF |
170 | grant_ref_t head; |
171 | ||
172 | spin_lock_irqsave(&gnttab_list_lock, flags); | |
173 | ||
174 | if ((gnttab_free_count < count) && | |
175 | ((rc = gnttab_expand(count - gnttab_free_count)) < 0)) { | |
176 | spin_unlock_irqrestore(&gnttab_list_lock, flags); | |
177 | return rc; | |
178 | } | |
179 | ||
180 | ref = head = gnttab_free_head; | |
181 | gnttab_free_count -= count; | |
182 | while (count-- > 1) | |
183 | head = gnttab_entry(head); | |
184 | gnttab_free_head = gnttab_entry(head); | |
185 | gnttab_entry(head) = GNTTAB_LIST_END; | |
186 | ||
187 | spin_unlock_irqrestore(&gnttab_list_lock, flags); | |
188 | ||
189 | return ref; | |
190 | } | |
191 | ||
192 | static void do_free_callbacks(void) | |
193 | { | |
194 | struct gnttab_free_callback *callback, *next; | |
195 | ||
196 | callback = gnttab_free_callback_list; | |
197 | gnttab_free_callback_list = NULL; | |
198 | ||
199 | while (callback != NULL) { | |
200 | next = callback->next; | |
201 | if (gnttab_free_count >= callback->count) { | |
202 | callback->next = NULL; | |
203 | callback->fn(callback->arg); | |
204 | } else { | |
205 | callback->next = gnttab_free_callback_list; | |
206 | gnttab_free_callback_list = callback; | |
207 | } | |
208 | callback = next; | |
209 | } | |
210 | } | |
211 | ||
212 | static inline void check_free_callbacks(void) | |
213 | { | |
214 | if (unlikely(gnttab_free_callback_list)) | |
215 | do_free_callbacks(); | |
216 | } | |
217 | ||
218 | static void put_free_entry(grant_ref_t ref) | |
219 | { | |
220 | unsigned long flags; | |
221 | spin_lock_irqsave(&gnttab_list_lock, flags); | |
222 | gnttab_entry(ref) = gnttab_free_head; | |
223 | gnttab_free_head = ref; | |
224 | gnttab_free_count++; | |
225 | check_free_callbacks(); | |
226 | spin_unlock_irqrestore(&gnttab_list_lock, flags); | |
227 | } | |
228 | ||
0f9f5a95 | 229 | /* |
b988b8ff | 230 | * Following applies to gnttab_update_entry_v1 and gnttab_update_entry_v2. |
0f9f5a95 AL |
231 | * Introducing a valid entry into the grant table: |
232 | * 1. Write ent->domid. | |
233 | * 2. Write ent->frame: | |
234 | * GTF_permit_access: Frame to which access is permitted. | |
235 | * GTF_accept_transfer: Pseudo-phys frame slot being filled by new | |
236 | * frame, or zero if none. | |
237 | * 3. Write memory barrier (WMB). | |
238 | * 4. Write ent->flags, inc. valid type. | |
239 | */ | |
240 | static void gnttab_update_entry_v1(grant_ref_t ref, domid_t domid, | |
241 | unsigned long frame, unsigned flags) | |
ad9a8612 | 242 | { |
0f9f5a95 AL |
243 | gnttab_shared.v1[ref].domid = domid; |
244 | gnttab_shared.v1[ref].frame = frame; | |
ad9a8612 | 245 | wmb(); |
0f9f5a95 | 246 | gnttab_shared.v1[ref].flags = flags; |
ad9a8612 JF |
247 | } |
248 | ||
b988b8ff JG |
249 | static void gnttab_update_entry_v2(grant_ref_t ref, domid_t domid, |
250 | unsigned long frame, unsigned int flags) | |
251 | { | |
252 | gnttab_shared.v2[ref].hdr.domid = domid; | |
253 | gnttab_shared.v2[ref].full_page.frame = frame; | |
254 | wmb(); /* Hypervisor concurrent accesses. */ | |
255 | gnttab_shared.v2[ref].hdr.flags = GTF_permit_access | flags; | |
256 | } | |
257 | ||
ad9a8612 JF |
258 | /* |
259 | * Public grant-issuing interface functions | |
260 | */ | |
261 | void gnttab_grant_foreign_access_ref(grant_ref_t ref, domid_t domid, | |
262 | unsigned long frame, int readonly) | |
263 | { | |
0f9f5a95 | 264 | gnttab_interface->update_entry(ref, domid, frame, |
ad9a8612 JF |
265 | GTF_permit_access | (readonly ? GTF_readonly : 0)); |
266 | } | |
267 | EXPORT_SYMBOL_GPL(gnttab_grant_foreign_access_ref); | |
268 | ||
269 | int gnttab_grant_foreign_access(domid_t domid, unsigned long frame, | |
270 | int readonly) | |
271 | { | |
272 | int ref; | |
273 | ||
274 | ref = get_free_entries(1); | |
275 | if (unlikely(ref < 0)) | |
276 | return -ENOSPC; | |
277 | ||
278 | gnttab_grant_foreign_access_ref(ref, domid, frame, readonly); | |
279 | ||
280 | return ref; | |
281 | } | |
282 | EXPORT_SYMBOL_GPL(gnttab_grant_foreign_access); | |
283 | ||
0f9f5a95 | 284 | static int gnttab_end_foreign_access_ref_v1(grant_ref_t ref, int readonly) |
ad9a8612 JF |
285 | { |
286 | u16 flags, nflags; | |
b1e495b2 | 287 | u16 *pflags; |
ad9a8612 | 288 | |
b1e495b2 AL |
289 | pflags = &gnttab_shared.v1[ref].flags; |
290 | nflags = *pflags; | |
ad9a8612 JF |
291 | do { |
292 | flags = nflags; | |
569ca5b3 | 293 | if (flags & (GTF_reading|GTF_writing)) |
ad9a8612 | 294 | return 0; |
b1e495b2 | 295 | } while ((nflags = sync_cmpxchg(pflags, flags, 0)) != flags); |
ad9a8612 JF |
296 | |
297 | return 1; | |
298 | } | |
0f9f5a95 | 299 | |
b988b8ff JG |
300 | static int gnttab_end_foreign_access_ref_v2(grant_ref_t ref, int readonly) |
301 | { | |
302 | gnttab_shared.v2[ref].hdr.flags = 0; | |
303 | mb(); /* Concurrent access by hypervisor. */ | |
304 | if (grstatus[ref] & (GTF_reading|GTF_writing)) { | |
305 | return 0; | |
306 | } else { | |
307 | /* | |
308 | * The read of grstatus needs to have acquire semantics. | |
309 | * On x86, reads already have that, and we just need to | |
310 | * protect against compiler reorderings. | |
311 | * On other architectures we may need a full barrier. | |
312 | */ | |
313 | #ifdef CONFIG_X86 | |
314 | barrier(); | |
315 | #else | |
316 | mb(); | |
317 | #endif | |
318 | } | |
319 | ||
320 | return 1; | |
321 | } | |
322 | ||
569ca5b3 | 323 | static inline int _gnttab_end_foreign_access_ref(grant_ref_t ref, int readonly) |
0f9f5a95 AL |
324 | { |
325 | return gnttab_interface->end_foreign_access_ref(ref, readonly); | |
326 | } | |
569ca5b3 JB |
327 | |
328 | int gnttab_end_foreign_access_ref(grant_ref_t ref, int readonly) | |
329 | { | |
330 | if (_gnttab_end_foreign_access_ref(ref, readonly)) | |
331 | return 1; | |
332 | pr_warn("WARNING: g.e. %#x still in use!\n", ref); | |
333 | return 0; | |
334 | } | |
ad9a8612 JF |
335 | EXPORT_SYMBOL_GPL(gnttab_end_foreign_access_ref); |
336 | ||
42baefac JG |
337 | static unsigned long gnttab_read_frame_v1(grant_ref_t ref) |
338 | { | |
339 | return gnttab_shared.v1[ref].frame; | |
340 | } | |
341 | ||
342 | static unsigned long gnttab_read_frame_v2(grant_ref_t ref) | |
343 | { | |
344 | return gnttab_shared.v2[ref].full_page.frame; | |
345 | } | |
346 | ||
569ca5b3 JB |
347 | struct deferred_entry { |
348 | struct list_head list; | |
349 | grant_ref_t ref; | |
350 | bool ro; | |
351 | uint16_t warn_delay; | |
352 | struct page *page; | |
353 | }; | |
354 | static LIST_HEAD(deferred_list); | |
24ed960a | 355 | static void gnttab_handle_deferred(struct timer_list *); |
1d27e3e2 | 356 | static DEFINE_TIMER(deferred_timer, gnttab_handle_deferred); |
569ca5b3 | 357 | |
24ed960a | 358 | static void gnttab_handle_deferred(struct timer_list *unused) |
569ca5b3 JB |
359 | { |
360 | unsigned int nr = 10; | |
361 | struct deferred_entry *first = NULL; | |
362 | unsigned long flags; | |
363 | ||
364 | spin_lock_irqsave(&gnttab_list_lock, flags); | |
365 | while (nr--) { | |
366 | struct deferred_entry *entry | |
367 | = list_first_entry(&deferred_list, | |
368 | struct deferred_entry, list); | |
369 | ||
370 | if (entry == first) | |
371 | break; | |
372 | list_del(&entry->list); | |
373 | spin_unlock_irqrestore(&gnttab_list_lock, flags); | |
374 | if (_gnttab_end_foreign_access_ref(entry->ref, entry->ro)) { | |
375 | put_free_entry(entry->ref); | |
42baefac JG |
376 | pr_debug("freeing g.e. %#x (pfn %#lx)\n", |
377 | entry->ref, page_to_pfn(entry->page)); | |
378 | put_page(entry->page); | |
569ca5b3 JB |
379 | kfree(entry); |
380 | entry = NULL; | |
381 | } else { | |
382 | if (!--entry->warn_delay) | |
283c0972 | 383 | pr_info("g.e. %#x still pending\n", entry->ref); |
569ca5b3 JB |
384 | if (!first) |
385 | first = entry; | |
386 | } | |
387 | spin_lock_irqsave(&gnttab_list_lock, flags); | |
388 | if (entry) | |
389 | list_add_tail(&entry->list, &deferred_list); | |
390 | else if (list_empty(&deferred_list)) | |
391 | break; | |
392 | } | |
393 | if (!list_empty(&deferred_list) && !timer_pending(&deferred_timer)) { | |
394 | deferred_timer.expires = jiffies + HZ; | |
395 | add_timer(&deferred_timer); | |
396 | } | |
397 | spin_unlock_irqrestore(&gnttab_list_lock, flags); | |
398 | } | |
399 | ||
400 | static void gnttab_add_deferred(grant_ref_t ref, bool readonly, | |
401 | struct page *page) | |
402 | { | |
42baefac JG |
403 | struct deferred_entry *entry; |
404 | gfp_t gfp = (in_atomic() || irqs_disabled()) ? GFP_ATOMIC : GFP_KERNEL; | |
569ca5b3 JB |
405 | const char *what = KERN_WARNING "leaking"; |
406 | ||
42baefac JG |
407 | entry = kmalloc(sizeof(*entry), gfp); |
408 | if (!page) { | |
409 | unsigned long gfn = gnttab_interface->read_frame(ref); | |
410 | ||
411 | page = pfn_to_page(gfn_to_pfn(gfn)); | |
412 | get_page(page); | |
413 | } | |
414 | ||
569ca5b3 JB |
415 | if (entry) { |
416 | unsigned long flags; | |
417 | ||
418 | entry->ref = ref; | |
419 | entry->ro = readonly; | |
420 | entry->page = page; | |
421 | entry->warn_delay = 60; | |
422 | spin_lock_irqsave(&gnttab_list_lock, flags); | |
423 | list_add_tail(&entry->list, &deferred_list); | |
424 | if (!timer_pending(&deferred_timer)) { | |
425 | deferred_timer.expires = jiffies + HZ; | |
426 | add_timer(&deferred_timer); | |
427 | } | |
428 | spin_unlock_irqrestore(&gnttab_list_lock, flags); | |
429 | what = KERN_DEBUG "deferring"; | |
430 | } | |
431 | printk("%s g.e. %#x (pfn %#lx)\n", | |
432 | what, ref, page ? page_to_pfn(page) : -1); | |
433 | } | |
434 | ||
6b1775f2 JG |
435 | int gnttab_try_end_foreign_access(grant_ref_t ref) |
436 | { | |
437 | int ret = _gnttab_end_foreign_access_ref(ref, 0); | |
438 | ||
439 | if (ret) | |
440 | put_free_entry(ref); | |
441 | ||
442 | return ret; | |
443 | } | |
444 | EXPORT_SYMBOL_GPL(gnttab_try_end_foreign_access); | |
445 | ||
ad9a8612 JF |
446 | void gnttab_end_foreign_access(grant_ref_t ref, int readonly, |
447 | unsigned long page) | |
448 | { | |
6b1775f2 | 449 | if (gnttab_try_end_foreign_access(ref)) { |
ad9a8612 | 450 | if (page != 0) |
3ac7292a | 451 | put_page(virt_to_page(page)); |
569ca5b3 JB |
452 | } else |
453 | gnttab_add_deferred(ref, readonly, | |
454 | page ? virt_to_page(page) : NULL); | |
ad9a8612 JF |
455 | } |
456 | EXPORT_SYMBOL_GPL(gnttab_end_foreign_access); | |
457 | ||
458 | int gnttab_grant_foreign_transfer(domid_t domid, unsigned long pfn) | |
459 | { | |
460 | int ref; | |
461 | ||
462 | ref = get_free_entries(1); | |
463 | if (unlikely(ref < 0)) | |
464 | return -ENOSPC; | |
465 | gnttab_grant_foreign_transfer_ref(ref, domid, pfn); | |
466 | ||
467 | return ref; | |
468 | } | |
469 | EXPORT_SYMBOL_GPL(gnttab_grant_foreign_transfer); | |
470 | ||
471 | void gnttab_grant_foreign_transfer_ref(grant_ref_t ref, domid_t domid, | |
472 | unsigned long pfn) | |
473 | { | |
0f9f5a95 | 474 | gnttab_interface->update_entry(ref, domid, pfn, GTF_accept_transfer); |
ad9a8612 JF |
475 | } |
476 | EXPORT_SYMBOL_GPL(gnttab_grant_foreign_transfer_ref); | |
477 | ||
0f9f5a95 | 478 | static unsigned long gnttab_end_foreign_transfer_ref_v1(grant_ref_t ref) |
ad9a8612 JF |
479 | { |
480 | unsigned long frame; | |
481 | u16 flags; | |
b1e495b2 AL |
482 | u16 *pflags; |
483 | ||
484 | pflags = &gnttab_shared.v1[ref].flags; | |
ad9a8612 JF |
485 | |
486 | /* | |
487 | * If a transfer is not even yet started, try to reclaim the grant | |
488 | * reference and return failure (== 0). | |
489 | */ | |
b1e495b2 AL |
490 | while (!((flags = *pflags) & GTF_transfer_committed)) { |
491 | if (sync_cmpxchg(pflags, flags, 0) == flags) | |
ad9a8612 JF |
492 | return 0; |
493 | cpu_relax(); | |
494 | } | |
495 | ||
496 | /* If a transfer is in progress then wait until it is completed. */ | |
497 | while (!(flags & GTF_transfer_completed)) { | |
b1e495b2 | 498 | flags = *pflags; |
ad9a8612 JF |
499 | cpu_relax(); |
500 | } | |
501 | ||
502 | rmb(); /* Read the frame number /after/ reading completion status. */ | |
0f9f5a95 | 503 | frame = gnttab_shared.v1[ref].frame; |
ad9a8612 JF |
504 | BUG_ON(frame == 0); |
505 | ||
506 | return frame; | |
507 | } | |
0f9f5a95 | 508 | |
b988b8ff JG |
509 | static unsigned long gnttab_end_foreign_transfer_ref_v2(grant_ref_t ref) |
510 | { | |
511 | unsigned long frame; | |
512 | u16 flags; | |
513 | u16 *pflags; | |
514 | ||
515 | pflags = &gnttab_shared.v2[ref].hdr.flags; | |
516 | ||
517 | /* | |
518 | * If a transfer is not even yet started, try to reclaim the grant | |
519 | * reference and return failure (== 0). | |
520 | */ | |
521 | while (!((flags = *pflags) & GTF_transfer_committed)) { | |
522 | if (sync_cmpxchg(pflags, flags, 0) == flags) | |
523 | return 0; | |
524 | cpu_relax(); | |
525 | } | |
526 | ||
527 | /* If a transfer is in progress then wait until it is completed. */ | |
528 | while (!(flags & GTF_transfer_completed)) { | |
529 | flags = *pflags; | |
530 | cpu_relax(); | |
531 | } | |
532 | ||
533 | rmb(); /* Read the frame number /after/ reading completion status. */ | |
534 | frame = gnttab_shared.v2[ref].full_page.frame; | |
535 | BUG_ON(frame == 0); | |
536 | ||
537 | return frame; | |
538 | } | |
539 | ||
0f9f5a95 AL |
540 | unsigned long gnttab_end_foreign_transfer_ref(grant_ref_t ref) |
541 | { | |
542 | return gnttab_interface->end_foreign_transfer_ref(ref); | |
543 | } | |
ad9a8612 JF |
544 | EXPORT_SYMBOL_GPL(gnttab_end_foreign_transfer_ref); |
545 | ||
546 | unsigned long gnttab_end_foreign_transfer(grant_ref_t ref) | |
547 | { | |
548 | unsigned long frame = gnttab_end_foreign_transfer_ref(ref); | |
549 | put_free_entry(ref); | |
550 | return frame; | |
551 | } | |
552 | EXPORT_SYMBOL_GPL(gnttab_end_foreign_transfer); | |
553 | ||
554 | void gnttab_free_grant_reference(grant_ref_t ref) | |
555 | { | |
556 | put_free_entry(ref); | |
557 | } | |
558 | EXPORT_SYMBOL_GPL(gnttab_free_grant_reference); | |
559 | ||
560 | void gnttab_free_grant_references(grant_ref_t head) | |
561 | { | |
562 | grant_ref_t ref; | |
563 | unsigned long flags; | |
564 | int count = 1; | |
565 | if (head == GNTTAB_LIST_END) | |
566 | return; | |
567 | spin_lock_irqsave(&gnttab_list_lock, flags); | |
568 | ref = head; | |
569 | while (gnttab_entry(ref) != GNTTAB_LIST_END) { | |
570 | ref = gnttab_entry(ref); | |
571 | count++; | |
572 | } | |
573 | gnttab_entry(ref) = gnttab_free_head; | |
574 | gnttab_free_head = head; | |
575 | gnttab_free_count += count; | |
576 | check_free_callbacks(); | |
577 | spin_unlock_irqrestore(&gnttab_list_lock, flags); | |
578 | } | |
579 | EXPORT_SYMBOL_GPL(gnttab_free_grant_references); | |
580 | ||
581 | int gnttab_alloc_grant_references(u16 count, grant_ref_t *head) | |
582 | { | |
583 | int h = get_free_entries(count); | |
584 | ||
585 | if (h < 0) | |
586 | return -ENOSPC; | |
587 | ||
588 | *head = h; | |
589 | ||
590 | return 0; | |
591 | } | |
592 | EXPORT_SYMBOL_GPL(gnttab_alloc_grant_references); | |
593 | ||
594 | int gnttab_empty_grant_references(const grant_ref_t *private_head) | |
595 | { | |
596 | return (*private_head == GNTTAB_LIST_END); | |
597 | } | |
598 | EXPORT_SYMBOL_GPL(gnttab_empty_grant_references); | |
599 | ||
600 | int gnttab_claim_grant_reference(grant_ref_t *private_head) | |
601 | { | |
602 | grant_ref_t g = *private_head; | |
603 | if (unlikely(g == GNTTAB_LIST_END)) | |
604 | return -ENOSPC; | |
605 | *private_head = gnttab_entry(g); | |
606 | return g; | |
607 | } | |
608 | EXPORT_SYMBOL_GPL(gnttab_claim_grant_reference); | |
609 | ||
610 | void gnttab_release_grant_reference(grant_ref_t *private_head, | |
611 | grant_ref_t release) | |
612 | { | |
613 | gnttab_entry(release) = *private_head; | |
614 | *private_head = release; | |
615 | } | |
616 | EXPORT_SYMBOL_GPL(gnttab_release_grant_reference); | |
617 | ||
618 | void gnttab_request_free_callback(struct gnttab_free_callback *callback, | |
619 | void (*fn)(void *), void *arg, u16 count) | |
620 | { | |
621 | unsigned long flags; | |
5f338d90 RPM |
622 | struct gnttab_free_callback *cb; |
623 | ||
ad9a8612 | 624 | spin_lock_irqsave(&gnttab_list_lock, flags); |
5f338d90 RPM |
625 | |
626 | /* Check if the callback is already on the list */ | |
627 | cb = gnttab_free_callback_list; | |
628 | while (cb) { | |
629 | if (cb == callback) | |
630 | goto out; | |
631 | cb = cb->next; | |
632 | } | |
633 | ||
ad9a8612 JF |
634 | callback->fn = fn; |
635 | callback->arg = arg; | |
636 | callback->count = count; | |
637 | callback->next = gnttab_free_callback_list; | |
638 | gnttab_free_callback_list = callback; | |
639 | check_free_callbacks(); | |
640 | out: | |
641 | spin_unlock_irqrestore(&gnttab_list_lock, flags); | |
642 | } | |
643 | EXPORT_SYMBOL_GPL(gnttab_request_free_callback); | |
644 | ||
645 | void gnttab_cancel_free_callback(struct gnttab_free_callback *callback) | |
646 | { | |
647 | struct gnttab_free_callback **pcb; | |
648 | unsigned long flags; | |
649 | ||
650 | spin_lock_irqsave(&gnttab_list_lock, flags); | |
651 | for (pcb = &gnttab_free_callback_list; *pcb; pcb = &(*pcb)->next) { | |
652 | if (*pcb == callback) { | |
653 | *pcb = callback->next; | |
654 | break; | |
655 | } | |
656 | } | |
657 | spin_unlock_irqrestore(&gnttab_list_lock, flags); | |
658 | } | |
659 | EXPORT_SYMBOL_GPL(gnttab_cancel_free_callback); | |
660 | ||
83c69324 JG |
661 | static unsigned int gnttab_frames(unsigned int frames, unsigned int align) |
662 | { | |
663 | return (frames * gnttab_interface->grefs_per_grant_frame + align - 1) / | |
664 | align; | |
665 | } | |
666 | ||
ad9a8612 JF |
667 | static int grow_gnttab_list(unsigned int more_frames) |
668 | { | |
669 | unsigned int new_nr_grant_frames, extra_entries, i; | |
bbc60c18 | 670 | unsigned int nr_glist_frames, new_nr_glist_frames; |
83c69324 | 671 | unsigned int grefs_per_frame; |
ad9a8612 | 672 | |
83c69324 | 673 | grefs_per_frame = gnttab_interface->grefs_per_grant_frame; |
d0b4d64a | 674 | |
ad9a8612 | 675 | new_nr_grant_frames = nr_grant_frames + more_frames; |
83c69324 | 676 | extra_entries = more_frames * grefs_per_frame; |
ad9a8612 | 677 | |
83c69324 JG |
678 | nr_glist_frames = gnttab_frames(nr_grant_frames, RPP); |
679 | new_nr_glist_frames = gnttab_frames(new_nr_grant_frames, RPP); | |
bbc60c18 | 680 | for (i = nr_glist_frames; i < new_nr_glist_frames; i++) { |
ad9a8612 JF |
681 | gnttab_list[i] = (grant_ref_t *)__get_free_page(GFP_ATOMIC); |
682 | if (!gnttab_list[i]) | |
683 | goto grow_nomem; | |
684 | } | |
685 | ||
686 | ||
83c69324 JG |
687 | for (i = grefs_per_frame * nr_grant_frames; |
688 | i < grefs_per_frame * new_nr_grant_frames - 1; i++) | |
ad9a8612 JF |
689 | gnttab_entry(i) = i + 1; |
690 | ||
691 | gnttab_entry(i) = gnttab_free_head; | |
83c69324 | 692 | gnttab_free_head = grefs_per_frame * nr_grant_frames; |
ad9a8612 JF |
693 | gnttab_free_count += extra_entries; |
694 | ||
695 | nr_grant_frames = new_nr_grant_frames; | |
696 | ||
697 | check_free_callbacks(); | |
698 | ||
699 | return 0; | |
700 | ||
701 | grow_nomem: | |
46e3626a | 702 | while (i-- > nr_glist_frames) |
ad9a8612 JF |
703 | free_page((unsigned long) gnttab_list[i]); |
704 | return -ENOMEM; | |
705 | } | |
706 | ||
707 | static unsigned int __max_nr_grant_frames(void) | |
708 | { | |
709 | struct gnttab_query_size query; | |
710 | int rc; | |
711 | ||
712 | query.dom = DOMID_SELF; | |
713 | ||
714 | rc = HYPERVISOR_grant_table_op(GNTTABOP_query_size, &query, 1); | |
715 | if ((rc < 0) || (query.status != GNTST_okay)) | |
716 | return 4; /* Legacy max supported number of frames */ | |
717 | ||
718 | return query.max_nr_frames; | |
719 | } | |
720 | ||
183d03cc | 721 | unsigned int gnttab_max_grant_frames(void) |
ad9a8612 JF |
722 | { |
723 | unsigned int xen_max = __max_nr_grant_frames(); | |
7f256020 KRW |
724 | static unsigned int boot_max_nr_grant_frames; |
725 | ||
726 | /* First time, initialize it properly. */ | |
727 | if (!boot_max_nr_grant_frames) | |
728 | boot_max_nr_grant_frames = __max_nr_grant_frames(); | |
ad9a8612 JF |
729 | |
730 | if (xen_max > boot_max_nr_grant_frames) | |
731 | return boot_max_nr_grant_frames; | |
732 | return xen_max; | |
733 | } | |
183d03cc | 734 | EXPORT_SYMBOL_GPL(gnttab_max_grant_frames); |
ad9a8612 | 735 | |
47c54205 | 736 | int gnttab_setup_auto_xlat_frames(phys_addr_t addr) |
efaf30a3 KRW |
737 | { |
738 | xen_pfn_t *pfn; | |
739 | unsigned int max_nr_gframes = __max_nr_grant_frames(); | |
740 | unsigned int i; | |
741 | void *vaddr; | |
742 | ||
743 | if (xen_auto_xlat_grant_frames.count) | |
744 | return -EINVAL; | |
745 | ||
5ed5451d | 746 | vaddr = xen_remap(addr, XEN_PAGE_SIZE * max_nr_gframes); |
efaf30a3 | 747 | if (vaddr == NULL) { |
47c54205 JG |
748 | pr_warn("Failed to ioremap gnttab share frames (addr=%pa)!\n", |
749 | &addr); | |
efaf30a3 KRW |
750 | return -ENOMEM; |
751 | } | |
752 | pfn = kcalloc(max_nr_gframes, sizeof(pfn[0]), GFP_KERNEL); | |
753 | if (!pfn) { | |
754 | xen_unmap(vaddr); | |
755 | return -ENOMEM; | |
756 | } | |
757 | for (i = 0; i < max_nr_gframes; i++) | |
5ed5451d | 758 | pfn[i] = XEN_PFN_DOWN(addr) + i; |
efaf30a3 KRW |
759 | |
760 | xen_auto_xlat_grant_frames.vaddr = vaddr; | |
761 | xen_auto_xlat_grant_frames.pfn = pfn; | |
762 | xen_auto_xlat_grant_frames.count = max_nr_gframes; | |
763 | ||
764 | return 0; | |
765 | } | |
766 | EXPORT_SYMBOL_GPL(gnttab_setup_auto_xlat_frames); | |
767 | ||
768 | void gnttab_free_auto_xlat_frames(void) | |
769 | { | |
770 | if (!xen_auto_xlat_grant_frames.count) | |
771 | return; | |
772 | kfree(xen_auto_xlat_grant_frames.pfn); | |
773 | xen_unmap(xen_auto_xlat_grant_frames.vaddr); | |
774 | ||
775 | xen_auto_xlat_grant_frames.pfn = NULL; | |
776 | xen_auto_xlat_grant_frames.count = 0; | |
777 | xen_auto_xlat_grant_frames.vaddr = NULL; | |
778 | } | |
779 | EXPORT_SYMBOL_GPL(gnttab_free_auto_xlat_frames); | |
780 | ||
8c3799ee | 781 | int gnttab_pages_set_private(int nr_pages, struct page **pages) |
ff4b156f | 782 | { |
8da7633f | 783 | int i; |
ff4b156f | 784 | |
8da7633f JH |
785 | for (i = 0; i < nr_pages; i++) { |
786 | #if BITS_PER_LONG < 64 | |
787 | struct xen_page_foreign *foreign; | |
788 | ||
789 | foreign = kzalloc(sizeof(*foreign), GFP_KERNEL); | |
8c3799ee | 790 | if (!foreign) |
8da7633f | 791 | return -ENOMEM; |
8c3799ee | 792 | |
8da7633f JH |
793 | set_page_private(pages[i], (unsigned long)foreign); |
794 | #endif | |
795 | SetPagePrivate(pages[i]); | |
796 | } | |
797 | ||
ff4b156f DV |
798 | return 0; |
799 | } | |
8c3799ee | 800 | EXPORT_SYMBOL_GPL(gnttab_pages_set_private); |
ff4b156f DV |
801 | |
802 | /** | |
8c3799ee OA |
803 | * gnttab_alloc_pages - alloc pages suitable for grant mapping into |
804 | * @nr_pages: number of pages to alloc | |
805 | * @pages: returns the pages | |
ff4b156f | 806 | */ |
8c3799ee OA |
807 | int gnttab_alloc_pages(int nr_pages, struct page **pages) |
808 | { | |
809 | int ret; | |
810 | ||
9e2369c0 | 811 | ret = xen_alloc_unpopulated_pages(nr_pages, pages); |
8c3799ee OA |
812 | if (ret < 0) |
813 | return ret; | |
814 | ||
815 | ret = gnttab_pages_set_private(nr_pages, pages); | |
816 | if (ret < 0) | |
817 | gnttab_free_pages(nr_pages, pages); | |
818 | ||
819 | return ret; | |
820 | } | |
821 | EXPORT_SYMBOL_GPL(gnttab_alloc_pages); | |
822 | ||
ee32f323 JG |
823 | #ifdef CONFIG_XEN_UNPOPULATED_ALLOC |
824 | static inline void cache_init(struct gnttab_page_cache *cache) | |
825 | { | |
826 | cache->pages = NULL; | |
827 | } | |
828 | ||
829 | static inline bool cache_empty(struct gnttab_page_cache *cache) | |
830 | { | |
831 | return !cache->pages; | |
832 | } | |
833 | ||
834 | static inline struct page *cache_deq(struct gnttab_page_cache *cache) | |
835 | { | |
836 | struct page *page; | |
837 | ||
838 | page = cache->pages; | |
839 | cache->pages = page->zone_device_data; | |
840 | ||
841 | return page; | |
842 | } | |
843 | ||
844 | static inline void cache_enq(struct gnttab_page_cache *cache, struct page *page) | |
845 | { | |
846 | page->zone_device_data = cache->pages; | |
847 | cache->pages = page; | |
848 | } | |
849 | #else | |
850 | static inline void cache_init(struct gnttab_page_cache *cache) | |
851 | { | |
852 | INIT_LIST_HEAD(&cache->pages); | |
853 | } | |
854 | ||
855 | static inline bool cache_empty(struct gnttab_page_cache *cache) | |
856 | { | |
857 | return list_empty(&cache->pages); | |
858 | } | |
859 | ||
860 | static inline struct page *cache_deq(struct gnttab_page_cache *cache) | |
861 | { | |
862 | struct page *page; | |
863 | ||
864 | page = list_first_entry(&cache->pages, struct page, lru); | |
865 | list_del(&page->lru); | |
866 | ||
867 | return page; | |
868 | } | |
869 | ||
870 | static inline void cache_enq(struct gnttab_page_cache *cache, struct page *page) | |
871 | { | |
872 | list_add(&page->lru, &cache->pages); | |
873 | } | |
874 | #endif | |
875 | ||
ca33479c JG |
876 | void gnttab_page_cache_init(struct gnttab_page_cache *cache) |
877 | { | |
878 | spin_lock_init(&cache->lock); | |
ee32f323 | 879 | cache_init(cache); |
ca33479c JG |
880 | cache->num_pages = 0; |
881 | } | |
882 | EXPORT_SYMBOL_GPL(gnttab_page_cache_init); | |
883 | ||
884 | int gnttab_page_cache_get(struct gnttab_page_cache *cache, struct page **page) | |
885 | { | |
886 | unsigned long flags; | |
887 | ||
888 | spin_lock_irqsave(&cache->lock, flags); | |
889 | ||
ee32f323 | 890 | if (cache_empty(cache)) { |
ca33479c JG |
891 | spin_unlock_irqrestore(&cache->lock, flags); |
892 | return gnttab_alloc_pages(1, page); | |
893 | } | |
894 | ||
ee32f323 | 895 | page[0] = cache_deq(cache); |
ca33479c JG |
896 | cache->num_pages--; |
897 | ||
898 | spin_unlock_irqrestore(&cache->lock, flags); | |
899 | ||
900 | return 0; | |
901 | } | |
902 | EXPORT_SYMBOL_GPL(gnttab_page_cache_get); | |
903 | ||
904 | void gnttab_page_cache_put(struct gnttab_page_cache *cache, struct page **page, | |
905 | unsigned int num) | |
906 | { | |
907 | unsigned long flags; | |
908 | unsigned int i; | |
909 | ||
910 | spin_lock_irqsave(&cache->lock, flags); | |
911 | ||
912 | for (i = 0; i < num; i++) | |
ee32f323 | 913 | cache_enq(cache, page[i]); |
ca33479c JG |
914 | cache->num_pages += num; |
915 | ||
916 | spin_unlock_irqrestore(&cache->lock, flags); | |
917 | } | |
918 | EXPORT_SYMBOL_GPL(gnttab_page_cache_put); | |
919 | ||
920 | void gnttab_page_cache_shrink(struct gnttab_page_cache *cache, unsigned int num) | |
921 | { | |
922 | struct page *page[10]; | |
923 | unsigned int i = 0; | |
924 | unsigned long flags; | |
925 | ||
926 | spin_lock_irqsave(&cache->lock, flags); | |
927 | ||
928 | while (cache->num_pages > num) { | |
ee32f323 | 929 | page[i] = cache_deq(cache); |
ca33479c JG |
930 | cache->num_pages--; |
931 | if (++i == ARRAY_SIZE(page)) { | |
932 | spin_unlock_irqrestore(&cache->lock, flags); | |
933 | gnttab_free_pages(i, page); | |
934 | i = 0; | |
935 | spin_lock_irqsave(&cache->lock, flags); | |
936 | } | |
937 | } | |
938 | ||
939 | spin_unlock_irqrestore(&cache->lock, flags); | |
940 | ||
941 | if (i != 0) | |
942 | gnttab_free_pages(i, page); | |
943 | } | |
944 | EXPORT_SYMBOL_GPL(gnttab_page_cache_shrink); | |
945 | ||
8c3799ee | 946 | void gnttab_pages_clear_private(int nr_pages, struct page **pages) |
ff4b156f | 947 | { |
8da7633f JH |
948 | int i; |
949 | ||
950 | for (i = 0; i < nr_pages; i++) { | |
951 | if (PagePrivate(pages[i])) { | |
952 | #if BITS_PER_LONG < 64 | |
953 | kfree((void *)page_private(pages[i])); | |
954 | #endif | |
955 | ClearPagePrivate(pages[i]); | |
956 | } | |
957 | } | |
8c3799ee OA |
958 | } |
959 | EXPORT_SYMBOL_GPL(gnttab_pages_clear_private); | |
960 | ||
961 | /** | |
962 | * gnttab_free_pages - free pages allocated by gnttab_alloc_pages() | |
963 | * @nr_pages; number of pages to free | |
964 | * @pages: the pages | |
965 | */ | |
966 | void gnttab_free_pages(int nr_pages, struct page **pages) | |
967 | { | |
968 | gnttab_pages_clear_private(nr_pages, pages); | |
9e2369c0 | 969 | xen_free_unpopulated_pages(nr_pages, pages); |
ff4b156f | 970 | } |
6e3cc2a6 | 971 | EXPORT_SYMBOL_GPL(gnttab_free_pages); |
ff4b156f | 972 | |
9bdc7304 OA |
973 | #ifdef CONFIG_XEN_GRANT_DMA_ALLOC |
974 | /** | |
975 | * gnttab_dma_alloc_pages - alloc DMAable pages suitable for grant mapping into | |
976 | * @args: arguments to the function | |
977 | */ | |
978 | int gnttab_dma_alloc_pages(struct gnttab_dma_alloc_args *args) | |
979 | { | |
980 | unsigned long pfn, start_pfn; | |
981 | size_t size; | |
982 | int i, ret; | |
983 | ||
984 | size = args->nr_pages << PAGE_SHIFT; | |
985 | if (args->coherent) | |
986 | args->vaddr = dma_alloc_coherent(args->dev, size, | |
987 | &args->dev_bus_addr, | |
988 | GFP_KERNEL | __GFP_NOWARN); | |
989 | else | |
990 | args->vaddr = dma_alloc_wc(args->dev, size, | |
991 | &args->dev_bus_addr, | |
992 | GFP_KERNEL | __GFP_NOWARN); | |
993 | if (!args->vaddr) { | |
994 | pr_debug("Failed to allocate DMA buffer of size %zu\n", size); | |
995 | return -ENOMEM; | |
996 | } | |
997 | ||
998 | start_pfn = __phys_to_pfn(args->dev_bus_addr); | |
999 | for (pfn = start_pfn, i = 0; pfn < start_pfn + args->nr_pages; | |
1000 | pfn++, i++) { | |
1001 | struct page *page = pfn_to_page(pfn); | |
1002 | ||
1003 | args->pages[i] = page; | |
1004 | args->frames[i] = xen_page_to_gfn(page); | |
1005 | xenmem_reservation_scrub_page(page); | |
1006 | } | |
1007 | ||
1008 | xenmem_reservation_va_mapping_reset(args->nr_pages, args->pages); | |
1009 | ||
1010 | ret = xenmem_reservation_decrease(args->nr_pages, args->frames); | |
1011 | if (ret != args->nr_pages) { | |
1012 | pr_debug("Failed to decrease reservation for DMA buffer\n"); | |
1013 | ret = -EFAULT; | |
1014 | goto fail; | |
1015 | } | |
1016 | ||
1017 | ret = gnttab_pages_set_private(args->nr_pages, args->pages); | |
1018 | if (ret < 0) | |
1019 | goto fail; | |
1020 | ||
1021 | return 0; | |
1022 | ||
1023 | fail: | |
1024 | gnttab_dma_free_pages(args); | |
1025 | return ret; | |
1026 | } | |
1027 | EXPORT_SYMBOL_GPL(gnttab_dma_alloc_pages); | |
1028 | ||
1029 | /** | |
1030 | * gnttab_dma_free_pages - free DMAable pages | |
1031 | * @args: arguments to the function | |
1032 | */ | |
1033 | int gnttab_dma_free_pages(struct gnttab_dma_alloc_args *args) | |
1034 | { | |
1035 | size_t size; | |
1036 | int i, ret; | |
1037 | ||
1038 | gnttab_pages_clear_private(args->nr_pages, args->pages); | |
1039 | ||
1040 | for (i = 0; i < args->nr_pages; i++) | |
1041 | args->frames[i] = page_to_xen_pfn(args->pages[i]); | |
1042 | ||
1043 | ret = xenmem_reservation_increase(args->nr_pages, args->frames); | |
1044 | if (ret != args->nr_pages) { | |
d9cccfa7 | 1045 | pr_debug("Failed to increase reservation for DMA buffer\n"); |
9bdc7304 OA |
1046 | ret = -EFAULT; |
1047 | } else { | |
1048 | ret = 0; | |
1049 | } | |
1050 | ||
1051 | xenmem_reservation_va_mapping_update(args->nr_pages, args->pages, | |
1052 | args->frames); | |
1053 | ||
1054 | size = args->nr_pages << PAGE_SHIFT; | |
1055 | if (args->coherent) | |
1056 | dma_free_coherent(args->dev, size, | |
1057 | args->vaddr, args->dev_bus_addr); | |
1058 | else | |
1059 | dma_free_wc(args->dev, size, | |
1060 | args->vaddr, args->dev_bus_addr); | |
1061 | return ret; | |
1062 | } | |
1063 | EXPORT_SYMBOL_GPL(gnttab_dma_free_pages); | |
1064 | #endif | |
1065 | ||
c571898f ALC |
1066 | /* Handling of paged out grant targets (GNTST_eagain) */ |
1067 | #define MAX_DELAY 256 | |
1068 | static inline void | |
1069 | gnttab_retry_eagain_gop(unsigned int cmd, void *gop, int16_t *status, | |
1070 | const char *func) | |
1071 | { | |
1072 | unsigned delay = 1; | |
1073 | ||
1074 | do { | |
1075 | BUG_ON(HYPERVISOR_grant_table_op(cmd, gop, 1)); | |
1076 | if (*status == GNTST_eagain) | |
1077 | msleep(delay++); | |
1078 | } while ((*status == GNTST_eagain) && (delay < MAX_DELAY)); | |
1079 | ||
1080 | if (delay >= MAX_DELAY) { | |
283c0972 | 1081 | pr_err("%s: %s eagain grant\n", func, current->comm); |
c571898f ALC |
1082 | *status = GNTST_bad_page; |
1083 | } | |
1084 | } | |
1085 | ||
1086 | void gnttab_batch_map(struct gnttab_map_grant_ref *batch, unsigned count) | |
1087 | { | |
1088 | struct gnttab_map_grant_ref *op; | |
1089 | ||
1090 | if (HYPERVISOR_grant_table_op(GNTTABOP_map_grant_ref, batch, count)) | |
1091 | BUG(); | |
1092 | for (op = batch; op < batch + count; op++) | |
1093 | if (op->status == GNTST_eagain) | |
1094 | gnttab_retry_eagain_gop(GNTTABOP_map_grant_ref, op, | |
1095 | &op->status, __func__); | |
1096 | } | |
1097 | EXPORT_SYMBOL_GPL(gnttab_batch_map); | |
1098 | ||
1099 | void gnttab_batch_copy(struct gnttab_copy *batch, unsigned count) | |
1100 | { | |
1101 | struct gnttab_copy *op; | |
1102 | ||
1103 | if (HYPERVISOR_grant_table_op(GNTTABOP_copy, batch, count)) | |
1104 | BUG(); | |
1105 | for (op = batch; op < batch + count; op++) | |
1106 | if (op->status == GNTST_eagain) | |
1107 | gnttab_retry_eagain_gop(GNTTABOP_copy, op, | |
1108 | &op->status, __func__); | |
1109 | } | |
1110 | EXPORT_SYMBOL_GPL(gnttab_batch_copy); | |
1111 | ||
008c320a JG |
1112 | void gnttab_foreach_grant_in_range(struct page *page, |
1113 | unsigned int offset, | |
1114 | unsigned int len, | |
1115 | xen_grant_fn_t fn, | |
1116 | void *data) | |
1117 | { | |
1118 | unsigned int goffset; | |
1119 | unsigned int glen; | |
1120 | unsigned long xen_pfn; | |
1121 | ||
1122 | len = min_t(unsigned int, PAGE_SIZE - offset, len); | |
1123 | goffset = xen_offset_in_page(offset); | |
1124 | ||
1125 | xen_pfn = page_to_xen_pfn(page) + XEN_PFN_DOWN(offset); | |
1126 | ||
1127 | while (len) { | |
1128 | glen = min_t(unsigned int, XEN_PAGE_SIZE - goffset, len); | |
1129 | fn(pfn_to_gfn(xen_pfn), goffset, glen, data); | |
1130 | ||
1131 | goffset = 0; | |
1132 | xen_pfn++; | |
1133 | len -= glen; | |
1134 | } | |
1135 | } | |
1136 | EXPORT_SYMBOL_GPL(gnttab_foreach_grant_in_range); | |
1137 | ||
f73314b2 JG |
1138 | void gnttab_foreach_grant(struct page **pages, |
1139 | unsigned int nr_grefs, | |
1140 | xen_grant_fn_t fn, | |
1141 | void *data) | |
1142 | { | |
1143 | unsigned int goffset = 0; | |
1144 | unsigned long xen_pfn = 0; | |
1145 | unsigned int i; | |
1146 | ||
1147 | for (i = 0; i < nr_grefs; i++) { | |
1148 | if ((i % XEN_PFN_PER_PAGE) == 0) { | |
1149 | xen_pfn = page_to_xen_pfn(pages[i / XEN_PFN_PER_PAGE]); | |
1150 | goffset = 0; | |
1151 | } | |
1152 | ||
1153 | fn(pfn_to_gfn(xen_pfn), goffset, XEN_PAGE_SIZE, data); | |
1154 | ||
1155 | goffset += XEN_PAGE_SIZE; | |
1156 | xen_pfn++; | |
1157 | } | |
1158 | } | |
1159 | ||
e85fc980 | 1160 | int gnttab_map_refs(struct gnttab_map_grant_ref *map_ops, |
c123799a | 1161 | struct gnttab_map_grant_ref *kmap_ops, |
e85fc980 | 1162 | struct page **pages, unsigned int count) |
289b777e SS |
1163 | { |
1164 | int i, ret; | |
289b777e SS |
1165 | |
1166 | ret = HYPERVISOR_grant_table_op(GNTTABOP_map_grant_ref, map_ops, count); | |
87f1d40a JF |
1167 | if (ret) |
1168 | return ret; | |
289b777e | 1169 | |
8da7633f | 1170 | for (i = 0; i < count; i++) { |
d59f5324 JG |
1171 | switch (map_ops[i].status) { |
1172 | case GNTST_okay: | |
1173 | { | |
8da7633f JH |
1174 | struct xen_page_foreign *foreign; |
1175 | ||
1176 | SetPageForeign(pages[i]); | |
1177 | foreign = xen_page_foreign(pages[i]); | |
1178 | foreign->domid = map_ops[i].dom; | |
1179 | foreign->gref = map_ops[i].ref; | |
d59f5324 JG |
1180 | break; |
1181 | } | |
1182 | ||
1183 | case GNTST_no_device_space: | |
1184 | pr_warn_ratelimited("maptrack limit reached, can't map all guest pages\n"); | |
1185 | break; | |
1186 | ||
1187 | case GNTST_eagain: | |
1188 | /* Retry eagain maps */ | |
1189 | gnttab_retry_eagain_gop(GNTTABOP_map_grant_ref, | |
1190 | map_ops + i, | |
1191 | &map_ops[i].status, __func__); | |
1192 | /* Test status in next loop iteration. */ | |
1193 | i--; | |
1194 | break; | |
1195 | ||
1196 | default: | |
1197 | break; | |
8da7633f JH |
1198 | } |
1199 | } | |
1200 | ||
1429d46d | 1201 | return set_foreign_p2m_mapping(map_ops, kmap_ops, pages, count); |
289b777e SS |
1202 | } |
1203 | EXPORT_SYMBOL_GPL(gnttab_map_refs); | |
1204 | ||
e85fc980 | 1205 | int gnttab_unmap_refs(struct gnttab_unmap_grant_ref *unmap_ops, |
853d0289 | 1206 | struct gnttab_unmap_grant_ref *kunmap_ops, |
e85fc980 | 1207 | struct page **pages, unsigned int count) |
289b777e | 1208 | { |
8da7633f | 1209 | unsigned int i; |
1429d46d | 1210 | int ret; |
289b777e SS |
1211 | |
1212 | ret = HYPERVISOR_grant_table_op(GNTTABOP_unmap_grant_ref, unmap_ops, count); | |
87f1d40a JF |
1213 | if (ret) |
1214 | return ret; | |
1215 | ||
8da7633f JH |
1216 | for (i = 0; i < count; i++) |
1217 | ClearPageForeign(pages[i]); | |
1218 | ||
853d0289 | 1219 | return clear_foreign_p2m_mapping(unmap_ops, kunmap_ops, pages, count); |
289b777e SS |
1220 | } |
1221 | EXPORT_SYMBOL_GPL(gnttab_unmap_refs); | |
1222 | ||
3f9f1c67 JH |
1223 | #define GNTTAB_UNMAP_REFS_DELAY 5 |
1224 | ||
1225 | static void __gnttab_unmap_refs_async(struct gntab_unmap_queue_data* item); | |
1226 | ||
1227 | static void gnttab_unmap_work(struct work_struct *work) | |
1228 | { | |
1229 | struct gntab_unmap_queue_data | |
1230 | *unmap_data = container_of(work, | |
1231 | struct gntab_unmap_queue_data, | |
1232 | gnttab_work.work); | |
1233 | if (unmap_data->age != UINT_MAX) | |
1234 | unmap_data->age++; | |
1235 | __gnttab_unmap_refs_async(unmap_data); | |
1236 | } | |
1237 | ||
1238 | static void __gnttab_unmap_refs_async(struct gntab_unmap_queue_data* item) | |
1239 | { | |
1240 | int ret; | |
1241 | int pc; | |
1242 | ||
1243 | for (pc = 0; pc < item->count; pc++) { | |
1244 | if (page_count(item->pages[pc]) > 1) { | |
1245 | unsigned long delay = GNTTAB_UNMAP_REFS_DELAY * (item->age + 1); | |
1246 | schedule_delayed_work(&item->gnttab_work, | |
1247 | msecs_to_jiffies(delay)); | |
1248 | return; | |
1249 | } | |
1250 | } | |
1251 | ||
1252 | ret = gnttab_unmap_refs(item->unmap_ops, item->kunmap_ops, | |
1253 | item->pages, item->count); | |
1254 | item->done(ret, item); | |
1255 | } | |
1256 | ||
1257 | void gnttab_unmap_refs_async(struct gntab_unmap_queue_data* item) | |
1258 | { | |
1259 | INIT_DELAYED_WORK(&item->gnttab_work, gnttab_unmap_work); | |
1260 | item->age = 0; | |
1261 | ||
1262 | __gnttab_unmap_refs_async(item); | |
1263 | } | |
1264 | EXPORT_SYMBOL_GPL(gnttab_unmap_refs_async); | |
1265 | ||
b44166cd BL |
1266 | static void unmap_refs_callback(int result, |
1267 | struct gntab_unmap_queue_data *data) | |
1268 | { | |
1269 | struct unmap_refs_callback_data *d = data->data; | |
1270 | ||
1271 | d->result = result; | |
1272 | complete(&d->completion); | |
1273 | } | |
1274 | ||
1275 | int gnttab_unmap_refs_sync(struct gntab_unmap_queue_data *item) | |
1276 | { | |
1277 | struct unmap_refs_callback_data data; | |
1278 | ||
1279 | init_completion(&data.completion); | |
1280 | item->data = &data; | |
1281 | item->done = &unmap_refs_callback; | |
1282 | gnttab_unmap_refs_async(item); | |
1283 | wait_for_completion(&data.completion); | |
1284 | ||
1285 | return data.result; | |
1286 | } | |
1287 | EXPORT_SYMBOL_GPL(gnttab_unmap_refs_sync); | |
1288 | ||
b988b8ff JG |
1289 | static unsigned int nr_status_frames(unsigned int nr_grant_frames) |
1290 | { | |
83c69324 | 1291 | return gnttab_frames(nr_grant_frames, SPP); |
b988b8ff JG |
1292 | } |
1293 | ||
ef32f892 | 1294 | static int gnttab_map_frames_v1(xen_pfn_t *frames, unsigned int nr_gframes) |
0f9f5a95 AL |
1295 | { |
1296 | int rc; | |
1297 | ||
1298 | rc = arch_gnttab_map_shared(frames, nr_gframes, | |
1299 | gnttab_max_grant_frames(), | |
1300 | &gnttab_shared.addr); | |
1301 | BUG_ON(rc); | |
1302 | ||
1303 | return 0; | |
1304 | } | |
1305 | ||
1306 | static void gnttab_unmap_frames_v1(void) | |
1307 | { | |
85ff6acb AL |
1308 | arch_gnttab_unmap(gnttab_shared.addr, nr_grant_frames); |
1309 | } | |
1310 | ||
b988b8ff JG |
1311 | static int gnttab_map_frames_v2(xen_pfn_t *frames, unsigned int nr_gframes) |
1312 | { | |
1313 | uint64_t *sframes; | |
1314 | unsigned int nr_sframes; | |
1315 | struct gnttab_get_status_frames getframes; | |
1316 | int rc; | |
1317 | ||
1318 | nr_sframes = nr_status_frames(nr_gframes); | |
1319 | ||
1320 | /* No need for kzalloc as it is initialized in following hypercall | |
1321 | * GNTTABOP_get_status_frames. | |
1322 | */ | |
1323 | sframes = kmalloc_array(nr_sframes, sizeof(uint64_t), GFP_ATOMIC); | |
1324 | if (!sframes) | |
1325 | return -ENOMEM; | |
1326 | ||
1327 | getframes.dom = DOMID_SELF; | |
1328 | getframes.nr_frames = nr_sframes; | |
1329 | set_xen_guest_handle(getframes.frame_list, sframes); | |
1330 | ||
1331 | rc = HYPERVISOR_grant_table_op(GNTTABOP_get_status_frames, | |
1332 | &getframes, 1); | |
1333 | if (rc == -ENOSYS) { | |
1334 | kfree(sframes); | |
1335 | return -ENOSYS; | |
1336 | } | |
1337 | ||
1338 | BUG_ON(rc || getframes.status); | |
1339 | ||
1340 | rc = arch_gnttab_map_status(sframes, nr_sframes, | |
1341 | nr_status_frames(gnttab_max_grant_frames()), | |
1342 | &grstatus); | |
1343 | BUG_ON(rc); | |
1344 | kfree(sframes); | |
1345 | ||
1346 | rc = arch_gnttab_map_shared(frames, nr_gframes, | |
1347 | gnttab_max_grant_frames(), | |
1348 | &gnttab_shared.addr); | |
1349 | BUG_ON(rc); | |
1350 | ||
1351 | return 0; | |
1352 | } | |
1353 | ||
1354 | static void gnttab_unmap_frames_v2(void) | |
1355 | { | |
1356 | arch_gnttab_unmap(gnttab_shared.addr, nr_grant_frames); | |
1357 | arch_gnttab_unmap(grstatus, nr_status_frames(nr_grant_frames)); | |
1358 | } | |
1359 | ||
ad9a8612 JF |
1360 | static int gnttab_map(unsigned int start_idx, unsigned int end_idx) |
1361 | { | |
1362 | struct gnttab_setup_table setup; | |
ef32f892 | 1363 | xen_pfn_t *frames; |
ad9a8612 JF |
1364 | unsigned int nr_gframes = end_idx + 1; |
1365 | int rc; | |
1366 | ||
6926f6d6 | 1367 | if (xen_feature(XENFEAT_auto_translated_physmap)) { |
183d03cc SS |
1368 | struct xen_add_to_physmap xatp; |
1369 | unsigned int i = end_idx; | |
1370 | rc = 0; | |
efaf30a3 | 1371 | BUG_ON(xen_auto_xlat_grant_frames.count < nr_gframes); |
183d03cc SS |
1372 | /* |
1373 | * Loop backwards, so that the first hypercall has the largest | |
1374 | * index, ensuring that the table will grow only once. | |
1375 | */ | |
1376 | do { | |
1377 | xatp.domid = DOMID_SELF; | |
1378 | xatp.idx = i; | |
1379 | xatp.space = XENMAPSPACE_grant_table; | |
efaf30a3 | 1380 | xatp.gpfn = xen_auto_xlat_grant_frames.pfn[i]; |
183d03cc SS |
1381 | rc = HYPERVISOR_memory_op(XENMEM_add_to_physmap, &xatp); |
1382 | if (rc != 0) { | |
283c0972 JP |
1383 | pr_warn("grant table add_to_physmap failed, err=%d\n", |
1384 | rc); | |
183d03cc SS |
1385 | break; |
1386 | } | |
1387 | } while (i-- > start_idx); | |
1388 | ||
1389 | return rc; | |
1390 | } | |
1391 | ||
85ff6acb AL |
1392 | /* No need for kzalloc as it is initialized in following hypercall |
1393 | * GNTTABOP_setup_table. | |
1394 | */ | |
6da2ec56 | 1395 | frames = kmalloc_array(nr_gframes, sizeof(unsigned long), GFP_ATOMIC); |
ad9a8612 JF |
1396 | if (!frames) |
1397 | return -ENOMEM; | |
1398 | ||
1399 | setup.dom = DOMID_SELF; | |
1400 | setup.nr_frames = nr_gframes; | |
87e27cf6 | 1401 | set_xen_guest_handle(setup.frame_list, frames); |
ad9a8612 JF |
1402 | |
1403 | rc = HYPERVISOR_grant_table_op(GNTTABOP_setup_table, &setup, 1); | |
1404 | if (rc == -ENOSYS) { | |
1405 | kfree(frames); | |
1406 | return -ENOSYS; | |
1407 | } | |
1408 | ||
1409 | BUG_ON(rc || setup.status); | |
1410 | ||
0f9f5a95 | 1411 | rc = gnttab_interface->map_frames(frames, nr_gframes); |
ad9a8612 JF |
1412 | |
1413 | kfree(frames); | |
1414 | ||
0f9f5a95 AL |
1415 | return rc; |
1416 | } | |
1417 | ||
86fc2136 | 1418 | static const struct gnttab_ops gnttab_v1_ops = { |
83c69324 JG |
1419 | .version = 1, |
1420 | .grefs_per_grant_frame = XEN_PAGE_SIZE / | |
1421 | sizeof(struct grant_entry_v1), | |
0f9f5a95 AL |
1422 | .map_frames = gnttab_map_frames_v1, |
1423 | .unmap_frames = gnttab_unmap_frames_v1, | |
1424 | .update_entry = gnttab_update_entry_v1, | |
1425 | .end_foreign_access_ref = gnttab_end_foreign_access_ref_v1, | |
1426 | .end_foreign_transfer_ref = gnttab_end_foreign_transfer_ref_v1, | |
42baefac | 1427 | .read_frame = gnttab_read_frame_v1, |
0f9f5a95 AL |
1428 | }; |
1429 | ||
b988b8ff | 1430 | static const struct gnttab_ops gnttab_v2_ops = { |
83c69324 JG |
1431 | .version = 2, |
1432 | .grefs_per_grant_frame = XEN_PAGE_SIZE / | |
1433 | sizeof(union grant_entry_v2), | |
b988b8ff JG |
1434 | .map_frames = gnttab_map_frames_v2, |
1435 | .unmap_frames = gnttab_unmap_frames_v2, | |
1436 | .update_entry = gnttab_update_entry_v2, | |
1437 | .end_foreign_access_ref = gnttab_end_foreign_access_ref_v2, | |
1438 | .end_foreign_transfer_ref = gnttab_end_foreign_transfer_ref_v2, | |
42baefac | 1439 | .read_frame = gnttab_read_frame_v2, |
b988b8ff JG |
1440 | }; |
1441 | ||
8dca4d96 | 1442 | static bool gnttab_need_v2(void) |
0f9f5a95 | 1443 | { |
8dca4d96 JG |
1444 | #ifdef CONFIG_X86 |
1445 | uint32_t base, width; | |
1446 | ||
1447 | if (xen_pv_domain()) { | |
1448 | base = xen_cpuid_base(); | |
1449 | if (cpuid_eax(base) < 5) | |
1450 | return false; /* Information not available, use V1. */ | |
1451 | width = cpuid_ebx(base + 5) & | |
1452 | XEN_CPUID_MACHINE_ADDRESS_WIDTH_MASK; | |
1453 | return width > 32 + PAGE_SHIFT; | |
1454 | } | |
1455 | #endif | |
1456 | return !!(max_possible_pfn >> 32); | |
1457 | } | |
85ff6acb | 1458 | |
0f9f5a95 AL |
1459 | static void gnttab_request_version(void) |
1460 | { | |
8dca4d96 | 1461 | long rc; |
b988b8ff | 1462 | struct gnttab_set_version gsv; |
85ff6acb | 1463 | |
8dca4d96 JG |
1464 | if (gnttab_need_v2()) |
1465 | gsv.version = 2; | |
1466 | else | |
1467 | gsv.version = 1; | |
1468 | ||
1469 | /* Boot parameter overrides automatic selection. */ | |
1470 | if (xen_gnttab_version >= 1 && xen_gnttab_version <= 2) | |
1471 | gsv.version = xen_gnttab_version; | |
b988b8ff JG |
1472 | |
1473 | rc = HYPERVISOR_grant_table_op(GNTTABOP_set_version, &gsv, 1); | |
83c69324 | 1474 | if (rc == 0 && gsv.version == 2) |
b988b8ff | 1475 | gnttab_interface = &gnttab_v2_ops; |
83c69324 | 1476 | else |
b988b8ff | 1477 | gnttab_interface = &gnttab_v1_ops; |
83c69324 JG |
1478 | pr_info("Grant tables using version %d layout\n", |
1479 | gnttab_interface->version); | |
ad9a8612 JF |
1480 | } |
1481 | ||
d0b4d64a | 1482 | static int gnttab_setup(void) |
ad9a8612 | 1483 | { |
183d03cc SS |
1484 | unsigned int max_nr_gframes; |
1485 | ||
1486 | max_nr_gframes = gnttab_max_grant_frames(); | |
1487 | if (max_nr_gframes < nr_grant_frames) | |
ad9a8612 | 1488 | return -ENOSYS; |
183d03cc | 1489 | |
45684753 | 1490 | if (xen_feature(XENFEAT_auto_translated_physmap) && gnttab_shared.addr == NULL) { |
efaf30a3 | 1491 | gnttab_shared.addr = xen_auto_xlat_grant_frames.vaddr; |
0f9f5a95 | 1492 | if (gnttab_shared.addr == NULL) { |
574878f9 | 1493 | pr_warn("gnttab share frames is not mapped!\n"); |
183d03cc SS |
1494 | return -ENOMEM; |
1495 | } | |
1496 | } | |
45684753 | 1497 | return gnttab_map(0, nr_grant_frames - 1); |
ad9a8612 JF |
1498 | } |
1499 | ||
d0b4d64a MW |
1500 | int gnttab_resume(void) |
1501 | { | |
1502 | gnttab_request_version(); | |
1503 | return gnttab_setup(); | |
1504 | } | |
1505 | ||
0e91398f | 1506 | int gnttab_suspend(void) |
ad9a8612 | 1507 | { |
13cd36a3 DV |
1508 | if (!xen_feature(XENFEAT_auto_translated_physmap)) |
1509 | gnttab_interface->unmap_frames(); | |
ad9a8612 JF |
1510 | return 0; |
1511 | } | |
1512 | ||
1513 | static int gnttab_expand(unsigned int req_entries) | |
1514 | { | |
1515 | int rc; | |
1516 | unsigned int cur, extra; | |
1517 | ||
1518 | cur = nr_grant_frames; | |
83c69324 JG |
1519 | extra = ((req_entries + gnttab_interface->grefs_per_grant_frame - 1) / |
1520 | gnttab_interface->grefs_per_grant_frame); | |
29d11cfd WW |
1521 | if (cur + extra > gnttab_max_grant_frames()) { |
1522 | pr_warn_ratelimited("xen/grant-table: max_grant_frames reached" | |
1523 | " cur=%u extra=%u limit=%u" | |
1524 | " gnttab_free_count=%u req_entries=%u\n", | |
1525 | cur, extra, gnttab_max_grant_frames(), | |
1526 | gnttab_free_count, req_entries); | |
ad9a8612 | 1527 | return -ENOSPC; |
29d11cfd | 1528 | } |
ad9a8612 JF |
1529 | |
1530 | rc = gnttab_map(cur, cur + extra - 1); | |
1531 | if (rc == 0) | |
1532 | rc = grow_gnttab_list(extra); | |
1533 | ||
1534 | return rc; | |
1535 | } | |
1536 | ||
183d03cc | 1537 | int gnttab_init(void) |
ad9a8612 JF |
1538 | { |
1539 | int i; | |
162e3717 | 1540 | unsigned long max_nr_grant_frames; |
bbc60c18 | 1541 | unsigned int max_nr_glist_frames, nr_glist_frames; |
ad9a8612 | 1542 | unsigned int nr_init_grefs; |
6b5e7d9e | 1543 | int ret; |
ad9a8612 | 1544 | |
d0b4d64a | 1545 | gnttab_request_version(); |
162e3717 | 1546 | max_nr_grant_frames = gnttab_max_grant_frames(); |
ad9a8612 | 1547 | nr_grant_frames = 1; |
ad9a8612 JF |
1548 | |
1549 | /* Determine the maximum number of frames required for the | |
1550 | * grant reference free list on the current hypervisor. | |
1551 | */ | |
162e3717 | 1552 | max_nr_glist_frames = (max_nr_grant_frames * |
83c69324 | 1553 | gnttab_interface->grefs_per_grant_frame / RPP); |
ad9a8612 | 1554 | |
6da2ec56 KC |
1555 | gnttab_list = kmalloc_array(max_nr_glist_frames, |
1556 | sizeof(grant_ref_t *), | |
1557 | GFP_KERNEL); | |
ad9a8612 JF |
1558 | if (gnttab_list == NULL) |
1559 | return -ENOMEM; | |
1560 | ||
83c69324 | 1561 | nr_glist_frames = gnttab_frames(nr_grant_frames, RPP); |
bbc60c18 | 1562 | for (i = 0; i < nr_glist_frames; i++) { |
ad9a8612 | 1563 | gnttab_list[i] = (grant_ref_t *)__get_free_page(GFP_KERNEL); |
6b5e7d9e JL |
1564 | if (gnttab_list[i] == NULL) { |
1565 | ret = -ENOMEM; | |
ad9a8612 | 1566 | goto ini_nomem; |
6b5e7d9e | 1567 | } |
ad9a8612 JF |
1568 | } |
1569 | ||
b988b8ff JG |
1570 | ret = arch_gnttab_init(max_nr_grant_frames, |
1571 | nr_status_frames(max_nr_grant_frames)); | |
162e3717 DV |
1572 | if (ret < 0) |
1573 | goto ini_nomem; | |
1574 | ||
d0b4d64a | 1575 | if (gnttab_setup() < 0) { |
6b5e7d9e JL |
1576 | ret = -ENODEV; |
1577 | goto ini_nomem; | |
1578 | } | |
ad9a8612 | 1579 | |
83c69324 JG |
1580 | nr_init_grefs = nr_grant_frames * |
1581 | gnttab_interface->grefs_per_grant_frame; | |
ad9a8612 JF |
1582 | |
1583 | for (i = NR_RESERVED_ENTRIES; i < nr_init_grefs - 1; i++) | |
1584 | gnttab_entry(i) = i + 1; | |
1585 | ||
1586 | gnttab_entry(nr_init_grefs - 1) = GNTTAB_LIST_END; | |
1587 | gnttab_free_count = nr_init_grefs - NR_RESERVED_ENTRIES; | |
1588 | gnttab_free_head = NR_RESERVED_ENTRIES; | |
1589 | ||
1590 | printk("Grant table initialized\n"); | |
1591 | return 0; | |
1592 | ||
1593 | ini_nomem: | |
1594 | for (i--; i >= 0; i--) | |
1595 | free_page((unsigned long)gnttab_list[i]); | |
1596 | kfree(gnttab_list); | |
6b5e7d9e | 1597 | return ret; |
ad9a8612 | 1598 | } |
183d03cc SS |
1599 | EXPORT_SYMBOL_GPL(gnttab_init); |
1600 | ||
345a5255 | 1601 | static int __gnttab_init(void) |
183d03cc | 1602 | { |
8613d78a BO |
1603 | if (!xen_domain()) |
1604 | return -ENODEV; | |
1605 | ||
183d03cc | 1606 | /* Delay grant-table initialization in the PV on HVM case */ |
8613d78a | 1607 | if (xen_hvm_domain() && !xen_pvh_domain()) |
183d03cc SS |
1608 | return 0; |
1609 | ||
183d03cc SS |
1610 | return gnttab_init(); |
1611 | } | |
6926f6d6 KRW |
1612 | /* Starts after core_initcall so that xen_pvh_gnttab_setup can be called |
1613 | * beforehand to initialize xen_auto_xlat_grant_frames. */ | |
1614 | core_initcall_sync(__gnttab_init); |