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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 | ||
02a9e681 | 36 | #include <linux/bitmap.h> |
57c8a661 | 37 | #include <linux/memblock.h> |
ad9a8612 JF |
38 | #include <linux/sched.h> |
39 | #include <linux/mm.h> | |
5a0e3ad6 | 40 | #include <linux/slab.h> |
ad9a8612 JF |
41 | #include <linux/vmalloc.h> |
42 | #include <linux/uaccess.h> | |
183d03cc | 43 | #include <linux/io.h> |
c571898f | 44 | #include <linux/delay.h> |
f62805f1 | 45 | #include <linux/hardirq.h> |
3f9f1c67 | 46 | #include <linux/workqueue.h> |
29d11cfd | 47 | #include <linux/ratelimit.h> |
8dca4d96 | 48 | #include <linux/moduleparam.h> |
9bdc7304 OA |
49 | #ifdef CONFIG_XEN_GRANT_DMA_ALLOC |
50 | #include <linux/dma-mapping.h> | |
51 | #endif | |
ad9a8612 | 52 | |
1ccbf534 | 53 | #include <xen/xen.h> |
ad9a8612 JF |
54 | #include <xen/interface/xen.h> |
55 | #include <xen/page.h> | |
56 | #include <xen/grant_table.h> | |
183d03cc | 57 | #include <xen/interface/memory.h> |
85ff6acb | 58 | #include <xen/hvc-console.h> |
3d24bbd7 | 59 | #include <xen/swiotlb-xen.h> |
ff4b156f | 60 | #include <xen/balloon.h> |
8dca4d96 JG |
61 | #ifdef CONFIG_X86 |
62 | #include <asm/xen/cpuid.h> | |
63 | #endif | |
9bdc7304 | 64 | #include <xen/mem-reservation.h> |
ecbf29cd | 65 | #include <asm/xen/hypercall.h> |
4d9310e3 | 66 | #include <asm/xen/interface.h> |
ad9a8612 | 67 | |
ad9a8612 JF |
68 | #include <asm/sync_bitops.h> |
69 | ||
ad9a8612 | 70 | #define GNTTAB_LIST_END 0xffffffff |
ad9a8612 JF |
71 | |
72 | static grant_ref_t **gnttab_list; | |
73 | static unsigned int nr_grant_frames; | |
02a9e681 JG |
74 | |
75 | /* | |
76 | * Handling of free grants: | |
77 | * | |
78 | * Free grants are in a simple list anchored in gnttab_free_head. They are | |
79 | * linked by grant ref, the last element contains GNTTAB_LIST_END. The number | |
80 | * of free entries is stored in gnttab_free_count. | |
81 | * Additionally there is a bitmap of free entries anchored in | |
82 | * gnttab_free_bitmap. This is being used for simplifying allocation of | |
83 | * multiple consecutive grants, which is needed e.g. for support of virtio. | |
84 | * gnttab_last_free is used to add free entries of new frames at the end of | |
85 | * the free list. | |
86 | * gnttab_free_tail_ptr specifies the variable which references the start | |
87 | * of consecutive free grants ending with gnttab_last_free. This pointer is | |
88 | * updated in a rather defensive way, in order to avoid performance hits in | |
89 | * hot paths. | |
90 | * All those variables are protected by gnttab_list_lock. | |
91 | */ | |
ad9a8612 | 92 | static int gnttab_free_count; |
02a9e681 JG |
93 | static unsigned int gnttab_size; |
94 | static grant_ref_t gnttab_free_head = GNTTAB_LIST_END; | |
95 | static grant_ref_t gnttab_last_free = GNTTAB_LIST_END; | |
96 | static grant_ref_t *gnttab_free_tail_ptr; | |
97 | static unsigned long *gnttab_free_bitmap; | |
ad9a8612 | 98 | static DEFINE_SPINLOCK(gnttab_list_lock); |
02a9e681 | 99 | |
efaf30a3 | 100 | struct grant_frames xen_auto_xlat_grant_frames; |
8dca4d96 JG |
101 | static unsigned int xen_gnttab_version; |
102 | module_param_named(version, xen_gnttab_version, uint, 0); | |
ad9a8612 | 103 | |
0f9f5a95 AL |
104 | static union { |
105 | struct grant_entry_v1 *v1; | |
b988b8ff | 106 | union grant_entry_v2 *v2; |
0f9f5a95 AL |
107 | void *addr; |
108 | } gnttab_shared; | |
109 | ||
110 | /*This is a structure of function pointers for grant table*/ | |
111 | struct gnttab_ops { | |
83c69324 JG |
112 | /* |
113 | * Version of the grant interface. | |
114 | */ | |
115 | unsigned int version; | |
116 | /* | |
117 | * Grant refs per grant frame. | |
118 | */ | |
119 | unsigned int grefs_per_grant_frame; | |
0f9f5a95 | 120 | /* |
9dbc71d5 AL |
121 | * Mapping a list of frames for storing grant entries. Frames parameter |
122 | * is used to store grant table address when grant table being setup, | |
123 | * nr_gframes is the number of frames to map grant table. Returning | |
124 | * GNTST_okay means success and negative value means failure. | |
0f9f5a95 | 125 | */ |
ef32f892 | 126 | int (*map_frames)(xen_pfn_t *frames, unsigned int nr_gframes); |
0f9f5a95 AL |
127 | /* |
128 | * Release a list of frames which are mapped in map_frames for grant | |
129 | * entry status. | |
130 | */ | |
131 | void (*unmap_frames)(void); | |
132 | /* | |
9dbc71d5 | 133 | * Introducing a valid entry into the grant table, granting the frame of |
b0f21263 | 134 | * this grant entry to domain for accessing. Ref |
9dbc71d5 AL |
135 | * parameter is reference of this introduced grant entry, domid is id of |
136 | * granted domain, frame is the page frame to be granted, and flags is | |
137 | * status of the grant entry to be updated. | |
0f9f5a95 | 138 | */ |
9dbc71d5 AL |
139 | void (*update_entry)(grant_ref_t ref, domid_t domid, |
140 | unsigned long frame, unsigned flags); | |
0f9f5a95 | 141 | /* |
9dbc71d5 | 142 | * Stop granting a grant entry to domain for accessing. Ref parameter is |
c94b731d JG |
143 | * reference of a grant entry whose grant access will be stopped. |
144 | * If the grant entry is currently mapped for reading or writing, just | |
145 | * return failure(==0) directly and don't tear down the grant access. | |
146 | * Otherwise, stop grant access for this entry and return success(==1). | |
0f9f5a95 | 147 | */ |
c94b731d | 148 | int (*end_foreign_access_ref)(grant_ref_t ref); |
42baefac JG |
149 | /* |
150 | * Read the frame number related to a given grant reference. | |
151 | */ | |
152 | unsigned long (*read_frame)(grant_ref_t ref); | |
0f9f5a95 AL |
153 | }; |
154 | ||
b44166cd BL |
155 | struct unmap_refs_callback_data { |
156 | struct completion completion; | |
157 | int result; | |
158 | }; | |
159 | ||
86fc2136 | 160 | static const struct gnttab_ops *gnttab_interface; |
0f9f5a95 | 161 | |
b988b8ff JG |
162 | /* This reflects status of grant entries, so act as a global value. */ |
163 | static grant_status_t *grstatus; | |
ad9a8612 JF |
164 | |
165 | static struct gnttab_free_callback *gnttab_free_callback_list; | |
166 | ||
167 | static int gnttab_expand(unsigned int req_entries); | |
168 | ||
169 | #define RPP (PAGE_SIZE / sizeof(grant_ref_t)) | |
b988b8ff | 170 | #define SPP (PAGE_SIZE / sizeof(grant_status_t)) |
ad9a8612 JF |
171 | |
172 | static inline grant_ref_t *__gnttab_entry(grant_ref_t entry) | |
173 | { | |
174 | return &gnttab_list[(entry) / RPP][(entry) % RPP]; | |
175 | } | |
176 | /* This can be used as an l-value */ | |
177 | #define gnttab_entry(entry) (*__gnttab_entry(entry)) | |
178 | ||
179 | static int get_free_entries(unsigned count) | |
180 | { | |
181 | unsigned long flags; | |
272800dc | 182 | int ref, rc = 0; |
ad9a8612 JF |
183 | grant_ref_t head; |
184 | ||
185 | spin_lock_irqsave(&gnttab_list_lock, flags); | |
186 | ||
187 | if ((gnttab_free_count < count) && | |
188 | ((rc = gnttab_expand(count - gnttab_free_count)) < 0)) { | |
189 | spin_unlock_irqrestore(&gnttab_list_lock, flags); | |
190 | return rc; | |
191 | } | |
192 | ||
193 | ref = head = gnttab_free_head; | |
194 | gnttab_free_count -= count; | |
02a9e681 JG |
195 | while (count--) { |
196 | bitmap_clear(gnttab_free_bitmap, head, 1); | |
197 | if (gnttab_free_tail_ptr == __gnttab_entry(head)) | |
198 | gnttab_free_tail_ptr = &gnttab_free_head; | |
199 | if (count) | |
200 | head = gnttab_entry(head); | |
201 | } | |
ad9a8612 JF |
202 | gnttab_free_head = gnttab_entry(head); |
203 | gnttab_entry(head) = GNTTAB_LIST_END; | |
204 | ||
02a9e681 JG |
205 | if (!gnttab_free_count) { |
206 | gnttab_last_free = GNTTAB_LIST_END; | |
207 | gnttab_free_tail_ptr = NULL; | |
208 | } | |
209 | ||
ad9a8612 JF |
210 | spin_unlock_irqrestore(&gnttab_list_lock, flags); |
211 | ||
212 | return ref; | |
213 | } | |
214 | ||
02a9e681 JG |
215 | static int get_seq_entry_count(void) |
216 | { | |
217 | if (gnttab_last_free == GNTTAB_LIST_END || !gnttab_free_tail_ptr || | |
218 | *gnttab_free_tail_ptr == GNTTAB_LIST_END) | |
219 | return 0; | |
220 | ||
221 | return gnttab_last_free - *gnttab_free_tail_ptr + 1; | |
222 | } | |
223 | ||
224 | /* Rebuilds the free grant list and tries to find count consecutive entries. */ | |
225 | static int get_free_seq(unsigned int count) | |
226 | { | |
227 | int ret = -ENOSPC; | |
228 | unsigned int from, to; | |
229 | grant_ref_t *last; | |
230 | ||
231 | gnttab_free_tail_ptr = &gnttab_free_head; | |
232 | last = &gnttab_free_head; | |
233 | ||
234 | for (from = find_first_bit(gnttab_free_bitmap, gnttab_size); | |
235 | from < gnttab_size; | |
236 | from = find_next_bit(gnttab_free_bitmap, gnttab_size, to + 1)) { | |
237 | to = find_next_zero_bit(gnttab_free_bitmap, gnttab_size, | |
238 | from + 1); | |
239 | if (ret < 0 && to - from >= count) { | |
240 | ret = from; | |
241 | bitmap_clear(gnttab_free_bitmap, ret, count); | |
242 | from += count; | |
243 | gnttab_free_count -= count; | |
244 | if (from == to) | |
245 | continue; | |
246 | } | |
247 | ||
248 | /* | |
249 | * Recreate the free list in order to have it properly sorted. | |
250 | * This is needed to make sure that the free tail has the maximum | |
251 | * possible size. | |
252 | */ | |
253 | while (from < to) { | |
254 | *last = from; | |
255 | last = __gnttab_entry(from); | |
256 | gnttab_last_free = from; | |
257 | from++; | |
258 | } | |
259 | if (to < gnttab_size) | |
260 | gnttab_free_tail_ptr = __gnttab_entry(to - 1); | |
261 | } | |
262 | ||
263 | *last = GNTTAB_LIST_END; | |
264 | if (gnttab_last_free != gnttab_size - 1) | |
265 | gnttab_free_tail_ptr = NULL; | |
266 | ||
267 | return ret; | |
268 | } | |
269 | ||
270 | static int get_free_entries_seq(unsigned int count) | |
271 | { | |
272 | unsigned long flags; | |
273 | int ret = 0; | |
274 | ||
275 | spin_lock_irqsave(&gnttab_list_lock, flags); | |
276 | ||
277 | if (gnttab_free_count < count) { | |
278 | ret = gnttab_expand(count - gnttab_free_count); | |
279 | if (ret < 0) | |
280 | goto out; | |
281 | } | |
282 | ||
283 | if (get_seq_entry_count() < count) { | |
284 | ret = get_free_seq(count); | |
285 | if (ret >= 0) | |
286 | goto out; | |
287 | ret = gnttab_expand(count - get_seq_entry_count()); | |
288 | if (ret < 0) | |
289 | goto out; | |
290 | } | |
291 | ||
292 | ret = *gnttab_free_tail_ptr; | |
293 | *gnttab_free_tail_ptr = gnttab_entry(ret + count - 1); | |
294 | gnttab_free_count -= count; | |
295 | if (!gnttab_free_count) | |
296 | gnttab_free_tail_ptr = NULL; | |
297 | bitmap_clear(gnttab_free_bitmap, ret, count); | |
298 | ||
299 | out: | |
300 | spin_unlock_irqrestore(&gnttab_list_lock, flags); | |
301 | ||
302 | return ret; | |
303 | } | |
304 | ||
ad9a8612 JF |
305 | static void do_free_callbacks(void) |
306 | { | |
307 | struct gnttab_free_callback *callback, *next; | |
308 | ||
309 | callback = gnttab_free_callback_list; | |
310 | gnttab_free_callback_list = NULL; | |
311 | ||
312 | while (callback != NULL) { | |
313 | next = callback->next; | |
314 | if (gnttab_free_count >= callback->count) { | |
315 | callback->next = NULL; | |
316 | callback->fn(callback->arg); | |
317 | } else { | |
318 | callback->next = gnttab_free_callback_list; | |
319 | gnttab_free_callback_list = callback; | |
320 | } | |
321 | callback = next; | |
322 | } | |
323 | } | |
324 | ||
325 | static inline void check_free_callbacks(void) | |
326 | { | |
327 | if (unlikely(gnttab_free_callback_list)) | |
328 | do_free_callbacks(); | |
329 | } | |
330 | ||
02a9e681 | 331 | static void put_free_entry_locked(grant_ref_t ref) |
ad9a8612 | 332 | { |
8c9eb0e3 JG |
333 | if (unlikely(ref < GNTTAB_NR_RESERVED_ENTRIES)) |
334 | return; | |
335 | ||
ad9a8612 JF |
336 | gnttab_entry(ref) = gnttab_free_head; |
337 | gnttab_free_head = ref; | |
02a9e681 JG |
338 | if (!gnttab_free_count) |
339 | gnttab_last_free = ref; | |
340 | if (gnttab_free_tail_ptr == &gnttab_free_head) | |
341 | gnttab_free_tail_ptr = __gnttab_entry(ref); | |
ad9a8612 | 342 | gnttab_free_count++; |
02a9e681 JG |
343 | bitmap_set(gnttab_free_bitmap, ref, 1); |
344 | } | |
345 | ||
346 | static void put_free_entry(grant_ref_t ref) | |
347 | { | |
348 | unsigned long flags; | |
349 | ||
350 | spin_lock_irqsave(&gnttab_list_lock, flags); | |
351 | put_free_entry_locked(ref); | |
ad9a8612 JF |
352 | check_free_callbacks(); |
353 | spin_unlock_irqrestore(&gnttab_list_lock, flags); | |
354 | } | |
355 | ||
02a9e681 JG |
356 | static void gnttab_set_free(unsigned int start, unsigned int n) |
357 | { | |
358 | unsigned int i; | |
359 | ||
360 | for (i = start; i < start + n - 1; i++) | |
361 | gnttab_entry(i) = i + 1; | |
362 | ||
363 | gnttab_entry(i) = GNTTAB_LIST_END; | |
364 | if (!gnttab_free_count) { | |
365 | gnttab_free_head = start; | |
366 | gnttab_free_tail_ptr = &gnttab_free_head; | |
367 | } else { | |
368 | gnttab_entry(gnttab_last_free) = start; | |
369 | } | |
370 | gnttab_free_count += n; | |
371 | gnttab_last_free = i; | |
372 | ||
373 | bitmap_set(gnttab_free_bitmap, start, n); | |
374 | } | |
375 | ||
0f9f5a95 | 376 | /* |
b988b8ff | 377 | * Following applies to gnttab_update_entry_v1 and gnttab_update_entry_v2. |
0f9f5a95 AL |
378 | * Introducing a valid entry into the grant table: |
379 | * 1. Write ent->domid. | |
b0f21263 | 380 | * 2. Write ent->frame: Frame to which access is permitted. |
0f9f5a95 AL |
381 | * 3. Write memory barrier (WMB). |
382 | * 4. Write ent->flags, inc. valid type. | |
383 | */ | |
384 | static void gnttab_update_entry_v1(grant_ref_t ref, domid_t domid, | |
385 | unsigned long frame, unsigned flags) | |
ad9a8612 | 386 | { |
0f9f5a95 AL |
387 | gnttab_shared.v1[ref].domid = domid; |
388 | gnttab_shared.v1[ref].frame = frame; | |
ad9a8612 | 389 | wmb(); |
0f9f5a95 | 390 | gnttab_shared.v1[ref].flags = flags; |
ad9a8612 JF |
391 | } |
392 | ||
b988b8ff JG |
393 | static void gnttab_update_entry_v2(grant_ref_t ref, domid_t domid, |
394 | unsigned long frame, unsigned int flags) | |
395 | { | |
396 | gnttab_shared.v2[ref].hdr.domid = domid; | |
397 | gnttab_shared.v2[ref].full_page.frame = frame; | |
398 | wmb(); /* Hypervisor concurrent accesses. */ | |
399 | gnttab_shared.v2[ref].hdr.flags = GTF_permit_access | flags; | |
400 | } | |
401 | ||
ad9a8612 JF |
402 | /* |
403 | * Public grant-issuing interface functions | |
404 | */ | |
405 | void gnttab_grant_foreign_access_ref(grant_ref_t ref, domid_t domid, | |
406 | unsigned long frame, int readonly) | |
407 | { | |
0f9f5a95 | 408 | gnttab_interface->update_entry(ref, domid, frame, |
ad9a8612 JF |
409 | GTF_permit_access | (readonly ? GTF_readonly : 0)); |
410 | } | |
411 | EXPORT_SYMBOL_GPL(gnttab_grant_foreign_access_ref); | |
412 | ||
413 | int gnttab_grant_foreign_access(domid_t domid, unsigned long frame, | |
414 | int readonly) | |
415 | { | |
416 | int ref; | |
417 | ||
418 | ref = get_free_entries(1); | |
419 | if (unlikely(ref < 0)) | |
420 | return -ENOSPC; | |
421 | ||
422 | gnttab_grant_foreign_access_ref(ref, domid, frame, readonly); | |
423 | ||
424 | return ref; | |
425 | } | |
426 | EXPORT_SYMBOL_GPL(gnttab_grant_foreign_access); | |
427 | ||
c94b731d | 428 | static int gnttab_end_foreign_access_ref_v1(grant_ref_t ref) |
ad9a8612 JF |
429 | { |
430 | u16 flags, nflags; | |
b1e495b2 | 431 | u16 *pflags; |
ad9a8612 | 432 | |
b1e495b2 AL |
433 | pflags = &gnttab_shared.v1[ref].flags; |
434 | nflags = *pflags; | |
ad9a8612 JF |
435 | do { |
436 | flags = nflags; | |
569ca5b3 | 437 | if (flags & (GTF_reading|GTF_writing)) |
ad9a8612 | 438 | return 0; |
b1e495b2 | 439 | } while ((nflags = sync_cmpxchg(pflags, flags, 0)) != flags); |
ad9a8612 JF |
440 | |
441 | return 1; | |
442 | } | |
0f9f5a95 | 443 | |
c94b731d | 444 | static int gnttab_end_foreign_access_ref_v2(grant_ref_t ref) |
b988b8ff JG |
445 | { |
446 | gnttab_shared.v2[ref].hdr.flags = 0; | |
447 | mb(); /* Concurrent access by hypervisor. */ | |
448 | if (grstatus[ref] & (GTF_reading|GTF_writing)) { | |
449 | return 0; | |
450 | } else { | |
451 | /* | |
452 | * The read of grstatus needs to have acquire semantics. | |
453 | * On x86, reads already have that, and we just need to | |
454 | * protect against compiler reorderings. | |
455 | * On other architectures we may need a full barrier. | |
456 | */ | |
457 | #ifdef CONFIG_X86 | |
458 | barrier(); | |
459 | #else | |
460 | mb(); | |
461 | #endif | |
462 | } | |
463 | ||
464 | return 1; | |
465 | } | |
466 | ||
c94b731d | 467 | static inline int _gnttab_end_foreign_access_ref(grant_ref_t ref) |
0f9f5a95 | 468 | { |
c94b731d | 469 | return gnttab_interface->end_foreign_access_ref(ref); |
0f9f5a95 | 470 | } |
569ca5b3 | 471 | |
c94b731d | 472 | int gnttab_end_foreign_access_ref(grant_ref_t ref) |
569ca5b3 | 473 | { |
c94b731d | 474 | if (_gnttab_end_foreign_access_ref(ref)) |
569ca5b3 JB |
475 | return 1; |
476 | pr_warn("WARNING: g.e. %#x still in use!\n", ref); | |
477 | return 0; | |
478 | } | |
ad9a8612 JF |
479 | EXPORT_SYMBOL_GPL(gnttab_end_foreign_access_ref); |
480 | ||
42baefac JG |
481 | static unsigned long gnttab_read_frame_v1(grant_ref_t ref) |
482 | { | |
483 | return gnttab_shared.v1[ref].frame; | |
484 | } | |
485 | ||
486 | static unsigned long gnttab_read_frame_v2(grant_ref_t ref) | |
487 | { | |
488 | return gnttab_shared.v2[ref].full_page.frame; | |
489 | } | |
490 | ||
569ca5b3 JB |
491 | struct deferred_entry { |
492 | struct list_head list; | |
493 | grant_ref_t ref; | |
569ca5b3 JB |
494 | uint16_t warn_delay; |
495 | struct page *page; | |
496 | }; | |
497 | static LIST_HEAD(deferred_list); | |
24ed960a | 498 | static void gnttab_handle_deferred(struct timer_list *); |
1d27e3e2 | 499 | static DEFINE_TIMER(deferred_timer, gnttab_handle_deferred); |
569ca5b3 | 500 | |
c04e9894 DMO |
501 | static atomic64_t deferred_count; |
502 | static atomic64_t leaked_count; | |
503 | static unsigned int free_per_iteration = 10; | |
504 | module_param(free_per_iteration, uint, 0600); | |
505 | ||
24ed960a | 506 | static void gnttab_handle_deferred(struct timer_list *unused) |
569ca5b3 | 507 | { |
c04e9894 DMO |
508 | unsigned int nr = READ_ONCE(free_per_iteration); |
509 | const bool ignore_limit = nr == 0; | |
569ca5b3 JB |
510 | struct deferred_entry *first = NULL; |
511 | unsigned long flags; | |
c04e9894 | 512 | size_t freed = 0; |
569ca5b3 JB |
513 | |
514 | spin_lock_irqsave(&gnttab_list_lock, flags); | |
c04e9894 | 515 | while ((ignore_limit || nr--) && !list_empty(&deferred_list)) { |
569ca5b3 JB |
516 | struct deferred_entry *entry |
517 | = list_first_entry(&deferred_list, | |
518 | struct deferred_entry, list); | |
519 | ||
520 | if (entry == first) | |
521 | break; | |
522 | list_del(&entry->list); | |
523 | spin_unlock_irqrestore(&gnttab_list_lock, flags); | |
c94b731d | 524 | if (_gnttab_end_foreign_access_ref(entry->ref)) { |
c04e9894 DMO |
525 | uint64_t ret = atomic64_dec_return(&deferred_count); |
526 | ||
569ca5b3 | 527 | put_free_entry(entry->ref); |
c04e9894 DMO |
528 | pr_debug("freeing g.e. %#x (pfn %#lx), %llu remaining\n", |
529 | entry->ref, page_to_pfn(entry->page), | |
530 | (unsigned long long)ret); | |
42baefac | 531 | put_page(entry->page); |
c04e9894 | 532 | freed++; |
569ca5b3 JB |
533 | kfree(entry); |
534 | entry = NULL; | |
535 | } else { | |
536 | if (!--entry->warn_delay) | |
283c0972 | 537 | pr_info("g.e. %#x still pending\n", entry->ref); |
569ca5b3 JB |
538 | if (!first) |
539 | first = entry; | |
540 | } | |
541 | spin_lock_irqsave(&gnttab_list_lock, flags); | |
542 | if (entry) | |
543 | list_add_tail(&entry->list, &deferred_list); | |
569ca5b3 | 544 | } |
c04e9894 DMO |
545 | if (list_empty(&deferred_list)) |
546 | WARN_ON(atomic64_read(&deferred_count)); | |
547 | else if (!timer_pending(&deferred_timer)) { | |
569ca5b3 JB |
548 | deferred_timer.expires = jiffies + HZ; |
549 | add_timer(&deferred_timer); | |
550 | } | |
551 | spin_unlock_irqrestore(&gnttab_list_lock, flags); | |
c04e9894 | 552 | pr_debug("Freed %zu references", freed); |
569ca5b3 JB |
553 | } |
554 | ||
c94b731d | 555 | static void gnttab_add_deferred(grant_ref_t ref, struct page *page) |
569ca5b3 | 556 | { |
42baefac JG |
557 | struct deferred_entry *entry; |
558 | gfp_t gfp = (in_atomic() || irqs_disabled()) ? GFP_ATOMIC : GFP_KERNEL; | |
c04e9894 | 559 | uint64_t leaked, deferred; |
569ca5b3 | 560 | |
42baefac JG |
561 | entry = kmalloc(sizeof(*entry), gfp); |
562 | if (!page) { | |
563 | unsigned long gfn = gnttab_interface->read_frame(ref); | |
564 | ||
565 | page = pfn_to_page(gfn_to_pfn(gfn)); | |
566 | get_page(page); | |
567 | } | |
568 | ||
569ca5b3 JB |
569 | if (entry) { |
570 | unsigned long flags; | |
571 | ||
572 | entry->ref = ref; | |
569ca5b3 JB |
573 | entry->page = page; |
574 | entry->warn_delay = 60; | |
575 | spin_lock_irqsave(&gnttab_list_lock, flags); | |
576 | list_add_tail(&entry->list, &deferred_list); | |
577 | if (!timer_pending(&deferred_timer)) { | |
578 | deferred_timer.expires = jiffies + HZ; | |
579 | add_timer(&deferred_timer); | |
580 | } | |
581 | spin_unlock_irqrestore(&gnttab_list_lock, flags); | |
c04e9894 DMO |
582 | deferred = atomic64_inc_return(&deferred_count); |
583 | leaked = atomic64_read(&leaked_count); | |
584 | pr_debug("deferring g.e. %#x (pfn %#lx) (total deferred %llu, total leaked %llu)\n", | |
585 | ref, page ? page_to_pfn(page) : -1, deferred, leaked); | |
586 | } else { | |
587 | deferred = atomic64_read(&deferred_count); | |
588 | leaked = atomic64_inc_return(&leaked_count); | |
589 | pr_warn("leaking g.e. %#x (pfn %#lx) (total deferred %llu, total leaked %llu)\n", | |
590 | ref, page ? page_to_pfn(page) : -1, deferred, leaked); | |
569ca5b3 | 591 | } |
569ca5b3 JB |
592 | } |
593 | ||
6b1775f2 JG |
594 | int gnttab_try_end_foreign_access(grant_ref_t ref) |
595 | { | |
c94b731d | 596 | int ret = _gnttab_end_foreign_access_ref(ref); |
6b1775f2 JG |
597 | |
598 | if (ret) | |
599 | put_free_entry(ref); | |
600 | ||
601 | return ret; | |
602 | } | |
603 | EXPORT_SYMBOL_GPL(gnttab_try_end_foreign_access); | |
604 | ||
49f8b459 | 605 | void gnttab_end_foreign_access(grant_ref_t ref, struct page *page) |
ad9a8612 | 606 | { |
6b1775f2 | 607 | if (gnttab_try_end_foreign_access(ref)) { |
49f8b459 JG |
608 | if (page) |
609 | put_page(page); | |
569ca5b3 | 610 | } else |
49f8b459 | 611 | gnttab_add_deferred(ref, page); |
ad9a8612 JF |
612 | } |
613 | EXPORT_SYMBOL_GPL(gnttab_end_foreign_access); | |
614 | ||
ad9a8612 JF |
615 | void gnttab_free_grant_reference(grant_ref_t ref) |
616 | { | |
617 | put_free_entry(ref); | |
618 | } | |
619 | EXPORT_SYMBOL_GPL(gnttab_free_grant_reference); | |
620 | ||
621 | void gnttab_free_grant_references(grant_ref_t head) | |
622 | { | |
623 | grant_ref_t ref; | |
624 | unsigned long flags; | |
02a9e681 | 625 | |
ad9a8612 | 626 | spin_lock_irqsave(&gnttab_list_lock, flags); |
02a9e681 JG |
627 | while (head != GNTTAB_LIST_END) { |
628 | ref = gnttab_entry(head); | |
629 | put_free_entry_locked(head); | |
630 | head = ref; | |
ad9a8612 | 631 | } |
ad9a8612 JF |
632 | check_free_callbacks(); |
633 | spin_unlock_irqrestore(&gnttab_list_lock, flags); | |
634 | } | |
635 | EXPORT_SYMBOL_GPL(gnttab_free_grant_references); | |
636 | ||
02a9e681 JG |
637 | void gnttab_free_grant_reference_seq(grant_ref_t head, unsigned int count) |
638 | { | |
639 | unsigned long flags; | |
640 | unsigned int i; | |
641 | ||
642 | spin_lock_irqsave(&gnttab_list_lock, flags); | |
643 | for (i = count; i > 0; i--) | |
644 | put_free_entry_locked(head + i - 1); | |
645 | check_free_callbacks(); | |
646 | spin_unlock_irqrestore(&gnttab_list_lock, flags); | |
647 | } | |
648 | EXPORT_SYMBOL_GPL(gnttab_free_grant_reference_seq); | |
649 | ||
ad9a8612 JF |
650 | int gnttab_alloc_grant_references(u16 count, grant_ref_t *head) |
651 | { | |
652 | int h = get_free_entries(count); | |
653 | ||
654 | if (h < 0) | |
655 | return -ENOSPC; | |
656 | ||
657 | *head = h; | |
658 | ||
659 | return 0; | |
660 | } | |
661 | EXPORT_SYMBOL_GPL(gnttab_alloc_grant_references); | |
662 | ||
02a9e681 JG |
663 | int gnttab_alloc_grant_reference_seq(unsigned int count, grant_ref_t *first) |
664 | { | |
665 | int h; | |
666 | ||
667 | if (count == 1) | |
668 | h = get_free_entries(1); | |
669 | else | |
670 | h = get_free_entries_seq(count); | |
671 | ||
672 | if (h < 0) | |
673 | return -ENOSPC; | |
674 | ||
675 | *first = h; | |
676 | ||
677 | return 0; | |
678 | } | |
679 | EXPORT_SYMBOL_GPL(gnttab_alloc_grant_reference_seq); | |
680 | ||
ad9a8612 JF |
681 | int gnttab_empty_grant_references(const grant_ref_t *private_head) |
682 | { | |
683 | return (*private_head == GNTTAB_LIST_END); | |
684 | } | |
685 | EXPORT_SYMBOL_GPL(gnttab_empty_grant_references); | |
686 | ||
687 | int gnttab_claim_grant_reference(grant_ref_t *private_head) | |
688 | { | |
689 | grant_ref_t g = *private_head; | |
690 | if (unlikely(g == GNTTAB_LIST_END)) | |
691 | return -ENOSPC; | |
692 | *private_head = gnttab_entry(g); | |
693 | return g; | |
694 | } | |
695 | EXPORT_SYMBOL_GPL(gnttab_claim_grant_reference); | |
696 | ||
697 | void gnttab_release_grant_reference(grant_ref_t *private_head, | |
698 | grant_ref_t release) | |
699 | { | |
700 | gnttab_entry(release) = *private_head; | |
701 | *private_head = release; | |
702 | } | |
703 | EXPORT_SYMBOL_GPL(gnttab_release_grant_reference); | |
704 | ||
705 | void gnttab_request_free_callback(struct gnttab_free_callback *callback, | |
706 | void (*fn)(void *), void *arg, u16 count) | |
707 | { | |
708 | unsigned long flags; | |
5f338d90 RPM |
709 | struct gnttab_free_callback *cb; |
710 | ||
ad9a8612 | 711 | spin_lock_irqsave(&gnttab_list_lock, flags); |
5f338d90 RPM |
712 | |
713 | /* Check if the callback is already on the list */ | |
714 | cb = gnttab_free_callback_list; | |
715 | while (cb) { | |
716 | if (cb == callback) | |
717 | goto out; | |
718 | cb = cb->next; | |
719 | } | |
720 | ||
ad9a8612 JF |
721 | callback->fn = fn; |
722 | callback->arg = arg; | |
723 | callback->count = count; | |
724 | callback->next = gnttab_free_callback_list; | |
725 | gnttab_free_callback_list = callback; | |
726 | check_free_callbacks(); | |
727 | out: | |
728 | spin_unlock_irqrestore(&gnttab_list_lock, flags); | |
729 | } | |
730 | EXPORT_SYMBOL_GPL(gnttab_request_free_callback); | |
731 | ||
732 | void gnttab_cancel_free_callback(struct gnttab_free_callback *callback) | |
733 | { | |
734 | struct gnttab_free_callback **pcb; | |
735 | unsigned long flags; | |
736 | ||
737 | spin_lock_irqsave(&gnttab_list_lock, flags); | |
738 | for (pcb = &gnttab_free_callback_list; *pcb; pcb = &(*pcb)->next) { | |
739 | if (*pcb == callback) { | |
740 | *pcb = callback->next; | |
741 | break; | |
742 | } | |
743 | } | |
744 | spin_unlock_irqrestore(&gnttab_list_lock, flags); | |
745 | } | |
746 | EXPORT_SYMBOL_GPL(gnttab_cancel_free_callback); | |
747 | ||
83c69324 JG |
748 | static unsigned int gnttab_frames(unsigned int frames, unsigned int align) |
749 | { | |
750 | return (frames * gnttab_interface->grefs_per_grant_frame + align - 1) / | |
751 | align; | |
752 | } | |
753 | ||
ad9a8612 JF |
754 | static int grow_gnttab_list(unsigned int more_frames) |
755 | { | |
756 | unsigned int new_nr_grant_frames, extra_entries, i; | |
bbc60c18 | 757 | unsigned int nr_glist_frames, new_nr_glist_frames; |
83c69324 | 758 | unsigned int grefs_per_frame; |
ad9a8612 | 759 | |
83c69324 | 760 | grefs_per_frame = gnttab_interface->grefs_per_grant_frame; |
d0b4d64a | 761 | |
ad9a8612 | 762 | new_nr_grant_frames = nr_grant_frames + more_frames; |
83c69324 | 763 | extra_entries = more_frames * grefs_per_frame; |
ad9a8612 | 764 | |
83c69324 JG |
765 | nr_glist_frames = gnttab_frames(nr_grant_frames, RPP); |
766 | new_nr_glist_frames = gnttab_frames(new_nr_grant_frames, RPP); | |
bbc60c18 | 767 | for (i = nr_glist_frames; i < new_nr_glist_frames; i++) { |
ad9a8612 JF |
768 | gnttab_list[i] = (grant_ref_t *)__get_free_page(GFP_ATOMIC); |
769 | if (!gnttab_list[i]) | |
770 | goto grow_nomem; | |
771 | } | |
772 | ||
02a9e681 | 773 | gnttab_set_free(gnttab_size, extra_entries); |
ad9a8612 | 774 | |
02a9e681 JG |
775 | if (!gnttab_free_tail_ptr) |
776 | gnttab_free_tail_ptr = __gnttab_entry(gnttab_size); | |
ad9a8612 JF |
777 | |
778 | nr_grant_frames = new_nr_grant_frames; | |
02a9e681 | 779 | gnttab_size += extra_entries; |
ad9a8612 JF |
780 | |
781 | check_free_callbacks(); | |
782 | ||
783 | return 0; | |
784 | ||
785 | grow_nomem: | |
46e3626a | 786 | while (i-- > nr_glist_frames) |
ad9a8612 JF |
787 | free_page((unsigned long) gnttab_list[i]); |
788 | return -ENOMEM; | |
789 | } | |
790 | ||
791 | static unsigned int __max_nr_grant_frames(void) | |
792 | { | |
793 | struct gnttab_query_size query; | |
794 | int rc; | |
795 | ||
796 | query.dom = DOMID_SELF; | |
797 | ||
798 | rc = HYPERVISOR_grant_table_op(GNTTABOP_query_size, &query, 1); | |
799 | if ((rc < 0) || (query.status != GNTST_okay)) | |
800 | return 4; /* Legacy max supported number of frames */ | |
801 | ||
802 | return query.max_nr_frames; | |
803 | } | |
804 | ||
183d03cc | 805 | unsigned int gnttab_max_grant_frames(void) |
ad9a8612 JF |
806 | { |
807 | unsigned int xen_max = __max_nr_grant_frames(); | |
7f256020 KRW |
808 | static unsigned int boot_max_nr_grant_frames; |
809 | ||
810 | /* First time, initialize it properly. */ | |
811 | if (!boot_max_nr_grant_frames) | |
812 | boot_max_nr_grant_frames = __max_nr_grant_frames(); | |
ad9a8612 JF |
813 | |
814 | if (xen_max > boot_max_nr_grant_frames) | |
815 | return boot_max_nr_grant_frames; | |
816 | return xen_max; | |
817 | } | |
183d03cc | 818 | EXPORT_SYMBOL_GPL(gnttab_max_grant_frames); |
ad9a8612 | 819 | |
47c54205 | 820 | int gnttab_setup_auto_xlat_frames(phys_addr_t addr) |
efaf30a3 KRW |
821 | { |
822 | xen_pfn_t *pfn; | |
823 | unsigned int max_nr_gframes = __max_nr_grant_frames(); | |
824 | unsigned int i; | |
825 | void *vaddr; | |
826 | ||
827 | if (xen_auto_xlat_grant_frames.count) | |
828 | return -EINVAL; | |
829 | ||
41925b10 | 830 | vaddr = memremap(addr, XEN_PAGE_SIZE * max_nr_gframes, MEMREMAP_WB); |
efaf30a3 | 831 | if (vaddr == NULL) { |
47c54205 JG |
832 | pr_warn("Failed to ioremap gnttab share frames (addr=%pa)!\n", |
833 | &addr); | |
efaf30a3 KRW |
834 | return -ENOMEM; |
835 | } | |
836 | pfn = kcalloc(max_nr_gframes, sizeof(pfn[0]), GFP_KERNEL); | |
837 | if (!pfn) { | |
41925b10 | 838 | memunmap(vaddr); |
efaf30a3 KRW |
839 | return -ENOMEM; |
840 | } | |
841 | for (i = 0; i < max_nr_gframes; i++) | |
5ed5451d | 842 | pfn[i] = XEN_PFN_DOWN(addr) + i; |
efaf30a3 KRW |
843 | |
844 | xen_auto_xlat_grant_frames.vaddr = vaddr; | |
845 | xen_auto_xlat_grant_frames.pfn = pfn; | |
846 | xen_auto_xlat_grant_frames.count = max_nr_gframes; | |
847 | ||
848 | return 0; | |
849 | } | |
850 | EXPORT_SYMBOL_GPL(gnttab_setup_auto_xlat_frames); | |
851 | ||
852 | void gnttab_free_auto_xlat_frames(void) | |
853 | { | |
854 | if (!xen_auto_xlat_grant_frames.count) | |
855 | return; | |
856 | kfree(xen_auto_xlat_grant_frames.pfn); | |
41925b10 | 857 | memunmap(xen_auto_xlat_grant_frames.vaddr); |
efaf30a3 KRW |
858 | |
859 | xen_auto_xlat_grant_frames.pfn = NULL; | |
860 | xen_auto_xlat_grant_frames.count = 0; | |
861 | xen_auto_xlat_grant_frames.vaddr = NULL; | |
862 | } | |
863 | EXPORT_SYMBOL_GPL(gnttab_free_auto_xlat_frames); | |
864 | ||
8c3799ee | 865 | int gnttab_pages_set_private(int nr_pages, struct page **pages) |
ff4b156f | 866 | { |
8da7633f | 867 | int i; |
ff4b156f | 868 | |
8da7633f JH |
869 | for (i = 0; i < nr_pages; i++) { |
870 | #if BITS_PER_LONG < 64 | |
871 | struct xen_page_foreign *foreign; | |
872 | ||
873 | foreign = kzalloc(sizeof(*foreign), GFP_KERNEL); | |
8c3799ee | 874 | if (!foreign) |
8da7633f | 875 | return -ENOMEM; |
8c3799ee | 876 | |
8da7633f JH |
877 | set_page_private(pages[i], (unsigned long)foreign); |
878 | #endif | |
879 | SetPagePrivate(pages[i]); | |
880 | } | |
881 | ||
ff4b156f DV |
882 | return 0; |
883 | } | |
8c3799ee | 884 | EXPORT_SYMBOL_GPL(gnttab_pages_set_private); |
ff4b156f DV |
885 | |
886 | /** | |
8c3799ee OA |
887 | * gnttab_alloc_pages - alloc pages suitable for grant mapping into |
888 | * @nr_pages: number of pages to alloc | |
889 | * @pages: returns the pages | |
ff4b156f | 890 | */ |
8c3799ee OA |
891 | int gnttab_alloc_pages(int nr_pages, struct page **pages) |
892 | { | |
893 | int ret; | |
894 | ||
9e2369c0 | 895 | ret = xen_alloc_unpopulated_pages(nr_pages, pages); |
8c3799ee OA |
896 | if (ret < 0) |
897 | return ret; | |
898 | ||
899 | ret = gnttab_pages_set_private(nr_pages, pages); | |
900 | if (ret < 0) | |
901 | gnttab_free_pages(nr_pages, pages); | |
902 | ||
903 | return ret; | |
904 | } | |
905 | EXPORT_SYMBOL_GPL(gnttab_alloc_pages); | |
906 | ||
ee32f323 JG |
907 | #ifdef CONFIG_XEN_UNPOPULATED_ALLOC |
908 | static inline void cache_init(struct gnttab_page_cache *cache) | |
909 | { | |
910 | cache->pages = NULL; | |
911 | } | |
912 | ||
913 | static inline bool cache_empty(struct gnttab_page_cache *cache) | |
914 | { | |
915 | return !cache->pages; | |
916 | } | |
917 | ||
918 | static inline struct page *cache_deq(struct gnttab_page_cache *cache) | |
919 | { | |
920 | struct page *page; | |
921 | ||
922 | page = cache->pages; | |
923 | cache->pages = page->zone_device_data; | |
924 | ||
925 | return page; | |
926 | } | |
927 | ||
928 | static inline void cache_enq(struct gnttab_page_cache *cache, struct page *page) | |
929 | { | |
930 | page->zone_device_data = cache->pages; | |
931 | cache->pages = page; | |
932 | } | |
933 | #else | |
934 | static inline void cache_init(struct gnttab_page_cache *cache) | |
935 | { | |
936 | INIT_LIST_HEAD(&cache->pages); | |
937 | } | |
938 | ||
939 | static inline bool cache_empty(struct gnttab_page_cache *cache) | |
940 | { | |
941 | return list_empty(&cache->pages); | |
942 | } | |
943 | ||
944 | static inline struct page *cache_deq(struct gnttab_page_cache *cache) | |
945 | { | |
946 | struct page *page; | |
947 | ||
948 | page = list_first_entry(&cache->pages, struct page, lru); | |
949 | list_del(&page->lru); | |
950 | ||
951 | return page; | |
952 | } | |
953 | ||
954 | static inline void cache_enq(struct gnttab_page_cache *cache, struct page *page) | |
955 | { | |
956 | list_add(&page->lru, &cache->pages); | |
957 | } | |
958 | #endif | |
959 | ||
ca33479c JG |
960 | void gnttab_page_cache_init(struct gnttab_page_cache *cache) |
961 | { | |
962 | spin_lock_init(&cache->lock); | |
ee32f323 | 963 | cache_init(cache); |
ca33479c JG |
964 | cache->num_pages = 0; |
965 | } | |
966 | EXPORT_SYMBOL_GPL(gnttab_page_cache_init); | |
967 | ||
968 | int gnttab_page_cache_get(struct gnttab_page_cache *cache, struct page **page) | |
969 | { | |
970 | unsigned long flags; | |
971 | ||
972 | spin_lock_irqsave(&cache->lock, flags); | |
973 | ||
ee32f323 | 974 | if (cache_empty(cache)) { |
ca33479c JG |
975 | spin_unlock_irqrestore(&cache->lock, flags); |
976 | return gnttab_alloc_pages(1, page); | |
977 | } | |
978 | ||
ee32f323 | 979 | page[0] = cache_deq(cache); |
ca33479c JG |
980 | cache->num_pages--; |
981 | ||
982 | spin_unlock_irqrestore(&cache->lock, flags); | |
983 | ||
984 | return 0; | |
985 | } | |
986 | EXPORT_SYMBOL_GPL(gnttab_page_cache_get); | |
987 | ||
988 | void gnttab_page_cache_put(struct gnttab_page_cache *cache, struct page **page, | |
989 | unsigned int num) | |
990 | { | |
991 | unsigned long flags; | |
992 | unsigned int i; | |
993 | ||
994 | spin_lock_irqsave(&cache->lock, flags); | |
995 | ||
996 | for (i = 0; i < num; i++) | |
ee32f323 | 997 | cache_enq(cache, page[i]); |
ca33479c JG |
998 | cache->num_pages += num; |
999 | ||
1000 | spin_unlock_irqrestore(&cache->lock, flags); | |
1001 | } | |
1002 | EXPORT_SYMBOL_GPL(gnttab_page_cache_put); | |
1003 | ||
1004 | void gnttab_page_cache_shrink(struct gnttab_page_cache *cache, unsigned int num) | |
1005 | { | |
1006 | struct page *page[10]; | |
1007 | unsigned int i = 0; | |
1008 | unsigned long flags; | |
1009 | ||
1010 | spin_lock_irqsave(&cache->lock, flags); | |
1011 | ||
1012 | while (cache->num_pages > num) { | |
ee32f323 | 1013 | page[i] = cache_deq(cache); |
ca33479c JG |
1014 | cache->num_pages--; |
1015 | if (++i == ARRAY_SIZE(page)) { | |
1016 | spin_unlock_irqrestore(&cache->lock, flags); | |
1017 | gnttab_free_pages(i, page); | |
1018 | i = 0; | |
1019 | spin_lock_irqsave(&cache->lock, flags); | |
1020 | } | |
1021 | } | |
1022 | ||
1023 | spin_unlock_irqrestore(&cache->lock, flags); | |
1024 | ||
1025 | if (i != 0) | |
1026 | gnttab_free_pages(i, page); | |
1027 | } | |
1028 | EXPORT_SYMBOL_GPL(gnttab_page_cache_shrink); | |
1029 | ||
8c3799ee | 1030 | void gnttab_pages_clear_private(int nr_pages, struct page **pages) |
ff4b156f | 1031 | { |
8da7633f JH |
1032 | int i; |
1033 | ||
1034 | for (i = 0; i < nr_pages; i++) { | |
1035 | if (PagePrivate(pages[i])) { | |
1036 | #if BITS_PER_LONG < 64 | |
1037 | kfree((void *)page_private(pages[i])); | |
1038 | #endif | |
1039 | ClearPagePrivate(pages[i]); | |
1040 | } | |
1041 | } | |
8c3799ee OA |
1042 | } |
1043 | EXPORT_SYMBOL_GPL(gnttab_pages_clear_private); | |
1044 | ||
1045 | /** | |
1046 | * gnttab_free_pages - free pages allocated by gnttab_alloc_pages() | |
187b4c0d | 1047 | * @nr_pages: number of pages to free |
8c3799ee OA |
1048 | * @pages: the pages |
1049 | */ | |
1050 | void gnttab_free_pages(int nr_pages, struct page **pages) | |
1051 | { | |
1052 | gnttab_pages_clear_private(nr_pages, pages); | |
9e2369c0 | 1053 | xen_free_unpopulated_pages(nr_pages, pages); |
ff4b156f | 1054 | } |
6e3cc2a6 | 1055 | EXPORT_SYMBOL_GPL(gnttab_free_pages); |
ff4b156f | 1056 | |
9bdc7304 OA |
1057 | #ifdef CONFIG_XEN_GRANT_DMA_ALLOC |
1058 | /** | |
1059 | * gnttab_dma_alloc_pages - alloc DMAable pages suitable for grant mapping into | |
1060 | * @args: arguments to the function | |
1061 | */ | |
1062 | int gnttab_dma_alloc_pages(struct gnttab_dma_alloc_args *args) | |
1063 | { | |
1064 | unsigned long pfn, start_pfn; | |
1065 | size_t size; | |
1066 | int i, ret; | |
1067 | ||
e9ea0b30 DC |
1068 | if (args->nr_pages < 0 || args->nr_pages > (INT_MAX >> PAGE_SHIFT)) |
1069 | return -ENOMEM; | |
1070 | ||
9bdc7304 OA |
1071 | size = args->nr_pages << PAGE_SHIFT; |
1072 | if (args->coherent) | |
1073 | args->vaddr = dma_alloc_coherent(args->dev, size, | |
1074 | &args->dev_bus_addr, | |
1075 | GFP_KERNEL | __GFP_NOWARN); | |
1076 | else | |
1077 | args->vaddr = dma_alloc_wc(args->dev, size, | |
1078 | &args->dev_bus_addr, | |
1079 | GFP_KERNEL | __GFP_NOWARN); | |
1080 | if (!args->vaddr) { | |
1081 | pr_debug("Failed to allocate DMA buffer of size %zu\n", size); | |
1082 | return -ENOMEM; | |
1083 | } | |
1084 | ||
1085 | start_pfn = __phys_to_pfn(args->dev_bus_addr); | |
1086 | for (pfn = start_pfn, i = 0; pfn < start_pfn + args->nr_pages; | |
1087 | pfn++, i++) { | |
1088 | struct page *page = pfn_to_page(pfn); | |
1089 | ||
1090 | args->pages[i] = page; | |
1091 | args->frames[i] = xen_page_to_gfn(page); | |
1092 | xenmem_reservation_scrub_page(page); | |
1093 | } | |
1094 | ||
1095 | xenmem_reservation_va_mapping_reset(args->nr_pages, args->pages); | |
1096 | ||
1097 | ret = xenmem_reservation_decrease(args->nr_pages, args->frames); | |
1098 | if (ret != args->nr_pages) { | |
1099 | pr_debug("Failed to decrease reservation for DMA buffer\n"); | |
1100 | ret = -EFAULT; | |
1101 | goto fail; | |
1102 | } | |
1103 | ||
1104 | ret = gnttab_pages_set_private(args->nr_pages, args->pages); | |
1105 | if (ret < 0) | |
1106 | goto fail; | |
1107 | ||
1108 | return 0; | |
1109 | ||
1110 | fail: | |
1111 | gnttab_dma_free_pages(args); | |
1112 | return ret; | |
1113 | } | |
1114 | EXPORT_SYMBOL_GPL(gnttab_dma_alloc_pages); | |
1115 | ||
1116 | /** | |
1117 | * gnttab_dma_free_pages - free DMAable pages | |
1118 | * @args: arguments to the function | |
1119 | */ | |
1120 | int gnttab_dma_free_pages(struct gnttab_dma_alloc_args *args) | |
1121 | { | |
1122 | size_t size; | |
1123 | int i, ret; | |
1124 | ||
1125 | gnttab_pages_clear_private(args->nr_pages, args->pages); | |
1126 | ||
1127 | for (i = 0; i < args->nr_pages; i++) | |
1128 | args->frames[i] = page_to_xen_pfn(args->pages[i]); | |
1129 | ||
1130 | ret = xenmem_reservation_increase(args->nr_pages, args->frames); | |
1131 | if (ret != args->nr_pages) { | |
d9cccfa7 | 1132 | pr_debug("Failed to increase reservation for DMA buffer\n"); |
9bdc7304 OA |
1133 | ret = -EFAULT; |
1134 | } else { | |
1135 | ret = 0; | |
1136 | } | |
1137 | ||
1138 | xenmem_reservation_va_mapping_update(args->nr_pages, args->pages, | |
1139 | args->frames); | |
1140 | ||
1141 | size = args->nr_pages << PAGE_SHIFT; | |
1142 | if (args->coherent) | |
1143 | dma_free_coherent(args->dev, size, | |
1144 | args->vaddr, args->dev_bus_addr); | |
1145 | else | |
1146 | dma_free_wc(args->dev, size, | |
1147 | args->vaddr, args->dev_bus_addr); | |
1148 | return ret; | |
1149 | } | |
1150 | EXPORT_SYMBOL_GPL(gnttab_dma_free_pages); | |
1151 | #endif | |
1152 | ||
c571898f ALC |
1153 | /* Handling of paged out grant targets (GNTST_eagain) */ |
1154 | #define MAX_DELAY 256 | |
1155 | static inline void | |
1156 | gnttab_retry_eagain_gop(unsigned int cmd, void *gop, int16_t *status, | |
1157 | const char *func) | |
1158 | { | |
1159 | unsigned delay = 1; | |
1160 | ||
1161 | do { | |
1162 | BUG_ON(HYPERVISOR_grant_table_op(cmd, gop, 1)); | |
1163 | if (*status == GNTST_eagain) | |
1164 | msleep(delay++); | |
1165 | } while ((*status == GNTST_eagain) && (delay < MAX_DELAY)); | |
1166 | ||
1167 | if (delay >= MAX_DELAY) { | |
283c0972 | 1168 | pr_err("%s: %s eagain grant\n", func, current->comm); |
c571898f ALC |
1169 | *status = GNTST_bad_page; |
1170 | } | |
1171 | } | |
1172 | ||
1173 | void gnttab_batch_map(struct gnttab_map_grant_ref *batch, unsigned count) | |
1174 | { | |
1175 | struct gnttab_map_grant_ref *op; | |
1176 | ||
1177 | if (HYPERVISOR_grant_table_op(GNTTABOP_map_grant_ref, batch, count)) | |
1178 | BUG(); | |
1179 | for (op = batch; op < batch + count; op++) | |
1180 | if (op->status == GNTST_eagain) | |
1181 | gnttab_retry_eagain_gop(GNTTABOP_map_grant_ref, op, | |
1182 | &op->status, __func__); | |
1183 | } | |
1184 | EXPORT_SYMBOL_GPL(gnttab_batch_map); | |
1185 | ||
1186 | void gnttab_batch_copy(struct gnttab_copy *batch, unsigned count) | |
1187 | { | |
1188 | struct gnttab_copy *op; | |
1189 | ||
1190 | if (HYPERVISOR_grant_table_op(GNTTABOP_copy, batch, count)) | |
1191 | BUG(); | |
1192 | for (op = batch; op < batch + count; op++) | |
1193 | if (op->status == GNTST_eagain) | |
1194 | gnttab_retry_eagain_gop(GNTTABOP_copy, op, | |
1195 | &op->status, __func__); | |
1196 | } | |
1197 | EXPORT_SYMBOL_GPL(gnttab_batch_copy); | |
1198 | ||
008c320a JG |
1199 | void gnttab_foreach_grant_in_range(struct page *page, |
1200 | unsigned int offset, | |
1201 | unsigned int len, | |
1202 | xen_grant_fn_t fn, | |
1203 | void *data) | |
1204 | { | |
1205 | unsigned int goffset; | |
1206 | unsigned int glen; | |
1207 | unsigned long xen_pfn; | |
1208 | ||
1209 | len = min_t(unsigned int, PAGE_SIZE - offset, len); | |
1210 | goffset = xen_offset_in_page(offset); | |
1211 | ||
1212 | xen_pfn = page_to_xen_pfn(page) + XEN_PFN_DOWN(offset); | |
1213 | ||
1214 | while (len) { | |
1215 | glen = min_t(unsigned int, XEN_PAGE_SIZE - goffset, len); | |
1216 | fn(pfn_to_gfn(xen_pfn), goffset, glen, data); | |
1217 | ||
1218 | goffset = 0; | |
1219 | xen_pfn++; | |
1220 | len -= glen; | |
1221 | } | |
1222 | } | |
1223 | EXPORT_SYMBOL_GPL(gnttab_foreach_grant_in_range); | |
1224 | ||
f73314b2 JG |
1225 | void gnttab_foreach_grant(struct page **pages, |
1226 | unsigned int nr_grefs, | |
1227 | xen_grant_fn_t fn, | |
1228 | void *data) | |
1229 | { | |
1230 | unsigned int goffset = 0; | |
1231 | unsigned long xen_pfn = 0; | |
1232 | unsigned int i; | |
1233 | ||
1234 | for (i = 0; i < nr_grefs; i++) { | |
1235 | if ((i % XEN_PFN_PER_PAGE) == 0) { | |
1236 | xen_pfn = page_to_xen_pfn(pages[i / XEN_PFN_PER_PAGE]); | |
1237 | goffset = 0; | |
1238 | } | |
1239 | ||
1240 | fn(pfn_to_gfn(xen_pfn), goffset, XEN_PAGE_SIZE, data); | |
1241 | ||
1242 | goffset += XEN_PAGE_SIZE; | |
1243 | xen_pfn++; | |
1244 | } | |
1245 | } | |
1246 | ||
e85fc980 | 1247 | int gnttab_map_refs(struct gnttab_map_grant_ref *map_ops, |
c123799a | 1248 | struct gnttab_map_grant_ref *kmap_ops, |
e85fc980 | 1249 | struct page **pages, unsigned int count) |
289b777e SS |
1250 | { |
1251 | int i, ret; | |
289b777e SS |
1252 | |
1253 | ret = HYPERVISOR_grant_table_op(GNTTABOP_map_grant_ref, map_ops, count); | |
87f1d40a JF |
1254 | if (ret) |
1255 | return ret; | |
289b777e | 1256 | |
8da7633f | 1257 | for (i = 0; i < count; i++) { |
d59f5324 JG |
1258 | switch (map_ops[i].status) { |
1259 | case GNTST_okay: | |
1260 | { | |
8da7633f JH |
1261 | struct xen_page_foreign *foreign; |
1262 | ||
1263 | SetPageForeign(pages[i]); | |
1264 | foreign = xen_page_foreign(pages[i]); | |
1265 | foreign->domid = map_ops[i].dom; | |
1266 | foreign->gref = map_ops[i].ref; | |
d59f5324 JG |
1267 | break; |
1268 | } | |
1269 | ||
1270 | case GNTST_no_device_space: | |
1271 | pr_warn_ratelimited("maptrack limit reached, can't map all guest pages\n"); | |
1272 | break; | |
1273 | ||
1274 | case GNTST_eagain: | |
1275 | /* Retry eagain maps */ | |
1276 | gnttab_retry_eagain_gop(GNTTABOP_map_grant_ref, | |
1277 | map_ops + i, | |
1278 | &map_ops[i].status, __func__); | |
1279 | /* Test status in next loop iteration. */ | |
1280 | i--; | |
1281 | break; | |
1282 | ||
1283 | default: | |
1284 | break; | |
8da7633f JH |
1285 | } |
1286 | } | |
1287 | ||
1429d46d | 1288 | return set_foreign_p2m_mapping(map_ops, kmap_ops, pages, count); |
289b777e SS |
1289 | } |
1290 | EXPORT_SYMBOL_GPL(gnttab_map_refs); | |
1291 | ||
e85fc980 | 1292 | int gnttab_unmap_refs(struct gnttab_unmap_grant_ref *unmap_ops, |
853d0289 | 1293 | struct gnttab_unmap_grant_ref *kunmap_ops, |
e85fc980 | 1294 | struct page **pages, unsigned int count) |
289b777e | 1295 | { |
8da7633f | 1296 | unsigned int i; |
1429d46d | 1297 | int ret; |
289b777e SS |
1298 | |
1299 | ret = HYPERVISOR_grant_table_op(GNTTABOP_unmap_grant_ref, unmap_ops, count); | |
87f1d40a JF |
1300 | if (ret) |
1301 | return ret; | |
1302 | ||
8da7633f JH |
1303 | for (i = 0; i < count; i++) |
1304 | ClearPageForeign(pages[i]); | |
1305 | ||
853d0289 | 1306 | return clear_foreign_p2m_mapping(unmap_ops, kunmap_ops, pages, count); |
289b777e SS |
1307 | } |
1308 | EXPORT_SYMBOL_GPL(gnttab_unmap_refs); | |
1309 | ||
3f9f1c67 JH |
1310 | #define GNTTAB_UNMAP_REFS_DELAY 5 |
1311 | ||
1312 | static void __gnttab_unmap_refs_async(struct gntab_unmap_queue_data* item); | |
1313 | ||
1314 | static void gnttab_unmap_work(struct work_struct *work) | |
1315 | { | |
1316 | struct gntab_unmap_queue_data | |
1317 | *unmap_data = container_of(work, | |
1318 | struct gntab_unmap_queue_data, | |
1319 | gnttab_work.work); | |
1320 | if (unmap_data->age != UINT_MAX) | |
1321 | unmap_data->age++; | |
1322 | __gnttab_unmap_refs_async(unmap_data); | |
1323 | } | |
1324 | ||
1325 | static void __gnttab_unmap_refs_async(struct gntab_unmap_queue_data* item) | |
1326 | { | |
1327 | int ret; | |
1328 | int pc; | |
1329 | ||
1330 | for (pc = 0; pc < item->count; pc++) { | |
1331 | if (page_count(item->pages[pc]) > 1) { | |
1332 | unsigned long delay = GNTTAB_UNMAP_REFS_DELAY * (item->age + 1); | |
1333 | schedule_delayed_work(&item->gnttab_work, | |
1334 | msecs_to_jiffies(delay)); | |
1335 | return; | |
1336 | } | |
1337 | } | |
1338 | ||
1339 | ret = gnttab_unmap_refs(item->unmap_ops, item->kunmap_ops, | |
1340 | item->pages, item->count); | |
1341 | item->done(ret, item); | |
1342 | } | |
1343 | ||
1344 | void gnttab_unmap_refs_async(struct gntab_unmap_queue_data* item) | |
1345 | { | |
1346 | INIT_DELAYED_WORK(&item->gnttab_work, gnttab_unmap_work); | |
1347 | item->age = 0; | |
1348 | ||
1349 | __gnttab_unmap_refs_async(item); | |
1350 | } | |
1351 | EXPORT_SYMBOL_GPL(gnttab_unmap_refs_async); | |
1352 | ||
b44166cd BL |
1353 | static void unmap_refs_callback(int result, |
1354 | struct gntab_unmap_queue_data *data) | |
1355 | { | |
1356 | struct unmap_refs_callback_data *d = data->data; | |
1357 | ||
1358 | d->result = result; | |
1359 | complete(&d->completion); | |
1360 | } | |
1361 | ||
1362 | int gnttab_unmap_refs_sync(struct gntab_unmap_queue_data *item) | |
1363 | { | |
1364 | struct unmap_refs_callback_data data; | |
1365 | ||
1366 | init_completion(&data.completion); | |
1367 | item->data = &data; | |
1368 | item->done = &unmap_refs_callback; | |
1369 | gnttab_unmap_refs_async(item); | |
1370 | wait_for_completion(&data.completion); | |
1371 | ||
1372 | return data.result; | |
1373 | } | |
1374 | EXPORT_SYMBOL_GPL(gnttab_unmap_refs_sync); | |
1375 | ||
b988b8ff JG |
1376 | static unsigned int nr_status_frames(unsigned int nr_grant_frames) |
1377 | { | |
83c69324 | 1378 | return gnttab_frames(nr_grant_frames, SPP); |
b988b8ff JG |
1379 | } |
1380 | ||
ef32f892 | 1381 | static int gnttab_map_frames_v1(xen_pfn_t *frames, unsigned int nr_gframes) |
0f9f5a95 AL |
1382 | { |
1383 | int rc; | |
1384 | ||
1385 | rc = arch_gnttab_map_shared(frames, nr_gframes, | |
1386 | gnttab_max_grant_frames(), | |
1387 | &gnttab_shared.addr); | |
1388 | BUG_ON(rc); | |
1389 | ||
1390 | return 0; | |
1391 | } | |
1392 | ||
1393 | static void gnttab_unmap_frames_v1(void) | |
1394 | { | |
85ff6acb AL |
1395 | arch_gnttab_unmap(gnttab_shared.addr, nr_grant_frames); |
1396 | } | |
1397 | ||
b988b8ff JG |
1398 | static int gnttab_map_frames_v2(xen_pfn_t *frames, unsigned int nr_gframes) |
1399 | { | |
1400 | uint64_t *sframes; | |
1401 | unsigned int nr_sframes; | |
1402 | struct gnttab_get_status_frames getframes; | |
1403 | int rc; | |
1404 | ||
1405 | nr_sframes = nr_status_frames(nr_gframes); | |
1406 | ||
1407 | /* No need for kzalloc as it is initialized in following hypercall | |
1408 | * GNTTABOP_get_status_frames. | |
1409 | */ | |
1410 | sframes = kmalloc_array(nr_sframes, sizeof(uint64_t), GFP_ATOMIC); | |
1411 | if (!sframes) | |
1412 | return -ENOMEM; | |
1413 | ||
1414 | getframes.dom = DOMID_SELF; | |
1415 | getframes.nr_frames = nr_sframes; | |
1416 | set_xen_guest_handle(getframes.frame_list, sframes); | |
1417 | ||
1418 | rc = HYPERVISOR_grant_table_op(GNTTABOP_get_status_frames, | |
1419 | &getframes, 1); | |
1420 | if (rc == -ENOSYS) { | |
1421 | kfree(sframes); | |
1422 | return -ENOSYS; | |
1423 | } | |
1424 | ||
1425 | BUG_ON(rc || getframes.status); | |
1426 | ||
1427 | rc = arch_gnttab_map_status(sframes, nr_sframes, | |
1428 | nr_status_frames(gnttab_max_grant_frames()), | |
1429 | &grstatus); | |
1430 | BUG_ON(rc); | |
1431 | kfree(sframes); | |
1432 | ||
1433 | rc = arch_gnttab_map_shared(frames, nr_gframes, | |
1434 | gnttab_max_grant_frames(), | |
1435 | &gnttab_shared.addr); | |
1436 | BUG_ON(rc); | |
1437 | ||
1438 | return 0; | |
1439 | } | |
1440 | ||
1441 | static void gnttab_unmap_frames_v2(void) | |
1442 | { | |
1443 | arch_gnttab_unmap(gnttab_shared.addr, nr_grant_frames); | |
1444 | arch_gnttab_unmap(grstatus, nr_status_frames(nr_grant_frames)); | |
1445 | } | |
1446 | ||
ad9a8612 JF |
1447 | static int gnttab_map(unsigned int start_idx, unsigned int end_idx) |
1448 | { | |
1449 | struct gnttab_setup_table setup; | |
ef32f892 | 1450 | xen_pfn_t *frames; |
ad9a8612 JF |
1451 | unsigned int nr_gframes = end_idx + 1; |
1452 | int rc; | |
1453 | ||
6926f6d6 | 1454 | if (xen_feature(XENFEAT_auto_translated_physmap)) { |
183d03cc SS |
1455 | struct xen_add_to_physmap xatp; |
1456 | unsigned int i = end_idx; | |
1457 | rc = 0; | |
efaf30a3 | 1458 | BUG_ON(xen_auto_xlat_grant_frames.count < nr_gframes); |
183d03cc SS |
1459 | /* |
1460 | * Loop backwards, so that the first hypercall has the largest | |
1461 | * index, ensuring that the table will grow only once. | |
1462 | */ | |
1463 | do { | |
1464 | xatp.domid = DOMID_SELF; | |
1465 | xatp.idx = i; | |
1466 | xatp.space = XENMAPSPACE_grant_table; | |
efaf30a3 | 1467 | xatp.gpfn = xen_auto_xlat_grant_frames.pfn[i]; |
183d03cc SS |
1468 | rc = HYPERVISOR_memory_op(XENMEM_add_to_physmap, &xatp); |
1469 | if (rc != 0) { | |
283c0972 JP |
1470 | pr_warn("grant table add_to_physmap failed, err=%d\n", |
1471 | rc); | |
183d03cc SS |
1472 | break; |
1473 | } | |
1474 | } while (i-- > start_idx); | |
1475 | ||
1476 | return rc; | |
1477 | } | |
1478 | ||
85ff6acb AL |
1479 | /* No need for kzalloc as it is initialized in following hypercall |
1480 | * GNTTABOP_setup_table. | |
1481 | */ | |
6da2ec56 | 1482 | frames = kmalloc_array(nr_gframes, sizeof(unsigned long), GFP_ATOMIC); |
ad9a8612 JF |
1483 | if (!frames) |
1484 | return -ENOMEM; | |
1485 | ||
1486 | setup.dom = DOMID_SELF; | |
1487 | setup.nr_frames = nr_gframes; | |
87e27cf6 | 1488 | set_xen_guest_handle(setup.frame_list, frames); |
ad9a8612 JF |
1489 | |
1490 | rc = HYPERVISOR_grant_table_op(GNTTABOP_setup_table, &setup, 1); | |
1491 | if (rc == -ENOSYS) { | |
1492 | kfree(frames); | |
1493 | return -ENOSYS; | |
1494 | } | |
1495 | ||
1496 | BUG_ON(rc || setup.status); | |
1497 | ||
0f9f5a95 | 1498 | rc = gnttab_interface->map_frames(frames, nr_gframes); |
ad9a8612 JF |
1499 | |
1500 | kfree(frames); | |
1501 | ||
0f9f5a95 AL |
1502 | return rc; |
1503 | } | |
1504 | ||
86fc2136 | 1505 | static const struct gnttab_ops gnttab_v1_ops = { |
83c69324 JG |
1506 | .version = 1, |
1507 | .grefs_per_grant_frame = XEN_PAGE_SIZE / | |
1508 | sizeof(struct grant_entry_v1), | |
0f9f5a95 AL |
1509 | .map_frames = gnttab_map_frames_v1, |
1510 | .unmap_frames = gnttab_unmap_frames_v1, | |
1511 | .update_entry = gnttab_update_entry_v1, | |
1512 | .end_foreign_access_ref = gnttab_end_foreign_access_ref_v1, | |
42baefac | 1513 | .read_frame = gnttab_read_frame_v1, |
0f9f5a95 AL |
1514 | }; |
1515 | ||
b988b8ff | 1516 | static const struct gnttab_ops gnttab_v2_ops = { |
83c69324 JG |
1517 | .version = 2, |
1518 | .grefs_per_grant_frame = XEN_PAGE_SIZE / | |
1519 | sizeof(union grant_entry_v2), | |
b988b8ff JG |
1520 | .map_frames = gnttab_map_frames_v2, |
1521 | .unmap_frames = gnttab_unmap_frames_v2, | |
1522 | .update_entry = gnttab_update_entry_v2, | |
1523 | .end_foreign_access_ref = gnttab_end_foreign_access_ref_v2, | |
42baefac | 1524 | .read_frame = gnttab_read_frame_v2, |
b988b8ff JG |
1525 | }; |
1526 | ||
8dca4d96 | 1527 | static bool gnttab_need_v2(void) |
0f9f5a95 | 1528 | { |
8dca4d96 JG |
1529 | #ifdef CONFIG_X86 |
1530 | uint32_t base, width; | |
1531 | ||
1532 | if (xen_pv_domain()) { | |
1533 | base = xen_cpuid_base(); | |
1534 | if (cpuid_eax(base) < 5) | |
1535 | return false; /* Information not available, use V1. */ | |
1536 | width = cpuid_ebx(base + 5) & | |
1537 | XEN_CPUID_MACHINE_ADDRESS_WIDTH_MASK; | |
1538 | return width > 32 + PAGE_SHIFT; | |
1539 | } | |
1540 | #endif | |
1541 | return !!(max_possible_pfn >> 32); | |
1542 | } | |
85ff6acb | 1543 | |
0f9f5a95 AL |
1544 | static void gnttab_request_version(void) |
1545 | { | |
8dca4d96 | 1546 | long rc; |
b988b8ff | 1547 | struct gnttab_set_version gsv; |
85ff6acb | 1548 | |
8dca4d96 JG |
1549 | if (gnttab_need_v2()) |
1550 | gsv.version = 2; | |
1551 | else | |
1552 | gsv.version = 1; | |
1553 | ||
1554 | /* Boot parameter overrides automatic selection. */ | |
1555 | if (xen_gnttab_version >= 1 && xen_gnttab_version <= 2) | |
1556 | gsv.version = xen_gnttab_version; | |
b988b8ff JG |
1557 | |
1558 | rc = HYPERVISOR_grant_table_op(GNTTABOP_set_version, &gsv, 1); | |
83c69324 | 1559 | if (rc == 0 && gsv.version == 2) |
b988b8ff | 1560 | gnttab_interface = &gnttab_v2_ops; |
83c69324 | 1561 | else |
b988b8ff | 1562 | gnttab_interface = &gnttab_v1_ops; |
83c69324 JG |
1563 | pr_info("Grant tables using version %d layout\n", |
1564 | gnttab_interface->version); | |
ad9a8612 JF |
1565 | } |
1566 | ||
d0b4d64a | 1567 | static int gnttab_setup(void) |
ad9a8612 | 1568 | { |
183d03cc SS |
1569 | unsigned int max_nr_gframes; |
1570 | ||
1571 | max_nr_gframes = gnttab_max_grant_frames(); | |
1572 | if (max_nr_gframes < nr_grant_frames) | |
ad9a8612 | 1573 | return -ENOSYS; |
183d03cc | 1574 | |
45684753 | 1575 | if (xen_feature(XENFEAT_auto_translated_physmap) && gnttab_shared.addr == NULL) { |
efaf30a3 | 1576 | gnttab_shared.addr = xen_auto_xlat_grant_frames.vaddr; |
0f9f5a95 | 1577 | if (gnttab_shared.addr == NULL) { |
574878f9 | 1578 | pr_warn("gnttab share frames is not mapped!\n"); |
183d03cc SS |
1579 | return -ENOMEM; |
1580 | } | |
1581 | } | |
45684753 | 1582 | return gnttab_map(0, nr_grant_frames - 1); |
ad9a8612 JF |
1583 | } |
1584 | ||
d0b4d64a MW |
1585 | int gnttab_resume(void) |
1586 | { | |
1587 | gnttab_request_version(); | |
1588 | return gnttab_setup(); | |
1589 | } | |
1590 | ||
0e91398f | 1591 | int gnttab_suspend(void) |
ad9a8612 | 1592 | { |
13cd36a3 DV |
1593 | if (!xen_feature(XENFEAT_auto_translated_physmap)) |
1594 | gnttab_interface->unmap_frames(); | |
ad9a8612 JF |
1595 | return 0; |
1596 | } | |
1597 | ||
1598 | static int gnttab_expand(unsigned int req_entries) | |
1599 | { | |
1600 | int rc; | |
1601 | unsigned int cur, extra; | |
1602 | ||
1603 | cur = nr_grant_frames; | |
83c69324 JG |
1604 | extra = ((req_entries + gnttab_interface->grefs_per_grant_frame - 1) / |
1605 | gnttab_interface->grefs_per_grant_frame); | |
29d11cfd WW |
1606 | if (cur + extra > gnttab_max_grant_frames()) { |
1607 | pr_warn_ratelimited("xen/grant-table: max_grant_frames reached" | |
1608 | " cur=%u extra=%u limit=%u" | |
1609 | " gnttab_free_count=%u req_entries=%u\n", | |
1610 | cur, extra, gnttab_max_grant_frames(), | |
1611 | gnttab_free_count, req_entries); | |
ad9a8612 | 1612 | return -ENOSPC; |
29d11cfd | 1613 | } |
ad9a8612 JF |
1614 | |
1615 | rc = gnttab_map(cur, cur + extra - 1); | |
1616 | if (rc == 0) | |
1617 | rc = grow_gnttab_list(extra); | |
1618 | ||
1619 | return rc; | |
1620 | } | |
1621 | ||
183d03cc | 1622 | int gnttab_init(void) |
ad9a8612 JF |
1623 | { |
1624 | int i; | |
02a9e681 | 1625 | unsigned long max_nr_grant_frames, max_nr_grefs; |
bbc60c18 | 1626 | unsigned int max_nr_glist_frames, nr_glist_frames; |
6b5e7d9e | 1627 | int ret; |
ad9a8612 | 1628 | |
d0b4d64a | 1629 | gnttab_request_version(); |
162e3717 | 1630 | max_nr_grant_frames = gnttab_max_grant_frames(); |
02a9e681 JG |
1631 | max_nr_grefs = max_nr_grant_frames * |
1632 | gnttab_interface->grefs_per_grant_frame; | |
ad9a8612 | 1633 | nr_grant_frames = 1; |
ad9a8612 JF |
1634 | |
1635 | /* Determine the maximum number of frames required for the | |
1636 | * grant reference free list on the current hypervisor. | |
1637 | */ | |
02a9e681 | 1638 | max_nr_glist_frames = max_nr_grefs / RPP; |
ad9a8612 | 1639 | |
6da2ec56 KC |
1640 | gnttab_list = kmalloc_array(max_nr_glist_frames, |
1641 | sizeof(grant_ref_t *), | |
1642 | GFP_KERNEL); | |
ad9a8612 JF |
1643 | if (gnttab_list == NULL) |
1644 | return -ENOMEM; | |
1645 | ||
83c69324 | 1646 | nr_glist_frames = gnttab_frames(nr_grant_frames, RPP); |
bbc60c18 | 1647 | for (i = 0; i < nr_glist_frames; i++) { |
ad9a8612 | 1648 | gnttab_list[i] = (grant_ref_t *)__get_free_page(GFP_KERNEL); |
6b5e7d9e JL |
1649 | if (gnttab_list[i] == NULL) { |
1650 | ret = -ENOMEM; | |
ad9a8612 | 1651 | goto ini_nomem; |
6b5e7d9e | 1652 | } |
ad9a8612 JF |
1653 | } |
1654 | ||
02a9e681 JG |
1655 | gnttab_free_bitmap = bitmap_zalloc(max_nr_grefs, GFP_KERNEL); |
1656 | if (!gnttab_free_bitmap) { | |
1657 | ret = -ENOMEM; | |
1658 | goto ini_nomem; | |
1659 | } | |
1660 | ||
b988b8ff JG |
1661 | ret = arch_gnttab_init(max_nr_grant_frames, |
1662 | nr_status_frames(max_nr_grant_frames)); | |
162e3717 DV |
1663 | if (ret < 0) |
1664 | goto ini_nomem; | |
1665 | ||
d0b4d64a | 1666 | if (gnttab_setup() < 0) { |
6b5e7d9e JL |
1667 | ret = -ENODEV; |
1668 | goto ini_nomem; | |
1669 | } | |
ad9a8612 | 1670 | |
02a9e681 | 1671 | gnttab_size = nr_grant_frames * gnttab_interface->grefs_per_grant_frame; |
ad9a8612 | 1672 | |
02a9e681 JG |
1673 | gnttab_set_free(GNTTAB_NR_RESERVED_ENTRIES, |
1674 | gnttab_size - GNTTAB_NR_RESERVED_ENTRIES); | |
ad9a8612 JF |
1675 | |
1676 | printk("Grant table initialized\n"); | |
1677 | return 0; | |
1678 | ||
1679 | ini_nomem: | |
1680 | for (i--; i >= 0; i--) | |
1681 | free_page((unsigned long)gnttab_list[i]); | |
1682 | kfree(gnttab_list); | |
02a9e681 | 1683 | bitmap_free(gnttab_free_bitmap); |
6b5e7d9e | 1684 | return ret; |
ad9a8612 | 1685 | } |
183d03cc SS |
1686 | EXPORT_SYMBOL_GPL(gnttab_init); |
1687 | ||
345a5255 | 1688 | static int __gnttab_init(void) |
183d03cc | 1689 | { |
8613d78a BO |
1690 | if (!xen_domain()) |
1691 | return -ENODEV; | |
1692 | ||
183d03cc | 1693 | /* Delay grant-table initialization in the PV on HVM case */ |
8613d78a | 1694 | if (xen_hvm_domain() && !xen_pvh_domain()) |
183d03cc SS |
1695 | return 0; |
1696 | ||
183d03cc SS |
1697 | return gnttab_init(); |
1698 | } | |
6926f6d6 KRW |
1699 | /* Starts after core_initcall so that xen_pvh_gnttab_setup can be called |
1700 | * beforehand to initialize xen_auto_xlat_grant_frames. */ | |
1701 | core_initcall_sync(__gnttab_init); |