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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 | |
24ed960a | 501 | static void gnttab_handle_deferred(struct timer_list *unused) |
569ca5b3 JB |
502 | { |
503 | unsigned int nr = 10; | |
504 | struct deferred_entry *first = NULL; | |
505 | unsigned long flags; | |
506 | ||
507 | spin_lock_irqsave(&gnttab_list_lock, flags); | |
508 | while (nr--) { | |
509 | struct deferred_entry *entry | |
510 | = list_first_entry(&deferred_list, | |
511 | struct deferred_entry, list); | |
512 | ||
513 | if (entry == first) | |
514 | break; | |
515 | list_del(&entry->list); | |
516 | spin_unlock_irqrestore(&gnttab_list_lock, flags); | |
c94b731d | 517 | if (_gnttab_end_foreign_access_ref(entry->ref)) { |
569ca5b3 | 518 | put_free_entry(entry->ref); |
42baefac JG |
519 | pr_debug("freeing g.e. %#x (pfn %#lx)\n", |
520 | entry->ref, page_to_pfn(entry->page)); | |
521 | put_page(entry->page); | |
569ca5b3 JB |
522 | kfree(entry); |
523 | entry = NULL; | |
524 | } else { | |
525 | if (!--entry->warn_delay) | |
283c0972 | 526 | pr_info("g.e. %#x still pending\n", entry->ref); |
569ca5b3 JB |
527 | if (!first) |
528 | first = entry; | |
529 | } | |
530 | spin_lock_irqsave(&gnttab_list_lock, flags); | |
531 | if (entry) | |
532 | list_add_tail(&entry->list, &deferred_list); | |
533 | else if (list_empty(&deferred_list)) | |
534 | break; | |
535 | } | |
536 | if (!list_empty(&deferred_list) && !timer_pending(&deferred_timer)) { | |
537 | deferred_timer.expires = jiffies + HZ; | |
538 | add_timer(&deferred_timer); | |
539 | } | |
540 | spin_unlock_irqrestore(&gnttab_list_lock, flags); | |
541 | } | |
542 | ||
c94b731d | 543 | static void gnttab_add_deferred(grant_ref_t ref, struct page *page) |
569ca5b3 | 544 | { |
42baefac JG |
545 | struct deferred_entry *entry; |
546 | gfp_t gfp = (in_atomic() || irqs_disabled()) ? GFP_ATOMIC : GFP_KERNEL; | |
569ca5b3 JB |
547 | const char *what = KERN_WARNING "leaking"; |
548 | ||
42baefac JG |
549 | entry = kmalloc(sizeof(*entry), gfp); |
550 | if (!page) { | |
551 | unsigned long gfn = gnttab_interface->read_frame(ref); | |
552 | ||
553 | page = pfn_to_page(gfn_to_pfn(gfn)); | |
554 | get_page(page); | |
555 | } | |
556 | ||
569ca5b3 JB |
557 | if (entry) { |
558 | unsigned long flags; | |
559 | ||
560 | entry->ref = ref; | |
569ca5b3 JB |
561 | entry->page = page; |
562 | entry->warn_delay = 60; | |
563 | spin_lock_irqsave(&gnttab_list_lock, flags); | |
564 | list_add_tail(&entry->list, &deferred_list); | |
565 | if (!timer_pending(&deferred_timer)) { | |
566 | deferred_timer.expires = jiffies + HZ; | |
567 | add_timer(&deferred_timer); | |
568 | } | |
569 | spin_unlock_irqrestore(&gnttab_list_lock, flags); | |
570 | what = KERN_DEBUG "deferring"; | |
571 | } | |
572 | printk("%s g.e. %#x (pfn %#lx)\n", | |
573 | what, ref, page ? page_to_pfn(page) : -1); | |
574 | } | |
575 | ||
6b1775f2 JG |
576 | int gnttab_try_end_foreign_access(grant_ref_t ref) |
577 | { | |
c94b731d | 578 | int ret = _gnttab_end_foreign_access_ref(ref); |
6b1775f2 JG |
579 | |
580 | if (ret) | |
581 | put_free_entry(ref); | |
582 | ||
583 | return ret; | |
584 | } | |
585 | EXPORT_SYMBOL_GPL(gnttab_try_end_foreign_access); | |
586 | ||
49f8b459 | 587 | void gnttab_end_foreign_access(grant_ref_t ref, struct page *page) |
ad9a8612 | 588 | { |
6b1775f2 | 589 | if (gnttab_try_end_foreign_access(ref)) { |
49f8b459 JG |
590 | if (page) |
591 | put_page(page); | |
569ca5b3 | 592 | } else |
49f8b459 | 593 | gnttab_add_deferred(ref, page); |
ad9a8612 JF |
594 | } |
595 | EXPORT_SYMBOL_GPL(gnttab_end_foreign_access); | |
596 | ||
ad9a8612 JF |
597 | void gnttab_free_grant_reference(grant_ref_t ref) |
598 | { | |
599 | put_free_entry(ref); | |
600 | } | |
601 | EXPORT_SYMBOL_GPL(gnttab_free_grant_reference); | |
602 | ||
603 | void gnttab_free_grant_references(grant_ref_t head) | |
604 | { | |
605 | grant_ref_t ref; | |
606 | unsigned long flags; | |
02a9e681 | 607 | |
ad9a8612 | 608 | spin_lock_irqsave(&gnttab_list_lock, flags); |
02a9e681 JG |
609 | while (head != GNTTAB_LIST_END) { |
610 | ref = gnttab_entry(head); | |
611 | put_free_entry_locked(head); | |
612 | head = ref; | |
ad9a8612 | 613 | } |
ad9a8612 JF |
614 | check_free_callbacks(); |
615 | spin_unlock_irqrestore(&gnttab_list_lock, flags); | |
616 | } | |
617 | EXPORT_SYMBOL_GPL(gnttab_free_grant_references); | |
618 | ||
02a9e681 JG |
619 | void gnttab_free_grant_reference_seq(grant_ref_t head, unsigned int count) |
620 | { | |
621 | unsigned long flags; | |
622 | unsigned int i; | |
623 | ||
624 | spin_lock_irqsave(&gnttab_list_lock, flags); | |
625 | for (i = count; i > 0; i--) | |
626 | put_free_entry_locked(head + i - 1); | |
627 | check_free_callbacks(); | |
628 | spin_unlock_irqrestore(&gnttab_list_lock, flags); | |
629 | } | |
630 | EXPORT_SYMBOL_GPL(gnttab_free_grant_reference_seq); | |
631 | ||
ad9a8612 JF |
632 | int gnttab_alloc_grant_references(u16 count, grant_ref_t *head) |
633 | { | |
634 | int h = get_free_entries(count); | |
635 | ||
636 | if (h < 0) | |
637 | return -ENOSPC; | |
638 | ||
639 | *head = h; | |
640 | ||
641 | return 0; | |
642 | } | |
643 | EXPORT_SYMBOL_GPL(gnttab_alloc_grant_references); | |
644 | ||
02a9e681 JG |
645 | int gnttab_alloc_grant_reference_seq(unsigned int count, grant_ref_t *first) |
646 | { | |
647 | int h; | |
648 | ||
649 | if (count == 1) | |
650 | h = get_free_entries(1); | |
651 | else | |
652 | h = get_free_entries_seq(count); | |
653 | ||
654 | if (h < 0) | |
655 | return -ENOSPC; | |
656 | ||
657 | *first = h; | |
658 | ||
659 | return 0; | |
660 | } | |
661 | EXPORT_SYMBOL_GPL(gnttab_alloc_grant_reference_seq); | |
662 | ||
ad9a8612 JF |
663 | int gnttab_empty_grant_references(const grant_ref_t *private_head) |
664 | { | |
665 | return (*private_head == GNTTAB_LIST_END); | |
666 | } | |
667 | EXPORT_SYMBOL_GPL(gnttab_empty_grant_references); | |
668 | ||
669 | int gnttab_claim_grant_reference(grant_ref_t *private_head) | |
670 | { | |
671 | grant_ref_t g = *private_head; | |
672 | if (unlikely(g == GNTTAB_LIST_END)) | |
673 | return -ENOSPC; | |
674 | *private_head = gnttab_entry(g); | |
675 | return g; | |
676 | } | |
677 | EXPORT_SYMBOL_GPL(gnttab_claim_grant_reference); | |
678 | ||
679 | void gnttab_release_grant_reference(grant_ref_t *private_head, | |
680 | grant_ref_t release) | |
681 | { | |
682 | gnttab_entry(release) = *private_head; | |
683 | *private_head = release; | |
684 | } | |
685 | EXPORT_SYMBOL_GPL(gnttab_release_grant_reference); | |
686 | ||
687 | void gnttab_request_free_callback(struct gnttab_free_callback *callback, | |
688 | void (*fn)(void *), void *arg, u16 count) | |
689 | { | |
690 | unsigned long flags; | |
5f338d90 RPM |
691 | struct gnttab_free_callback *cb; |
692 | ||
ad9a8612 | 693 | spin_lock_irqsave(&gnttab_list_lock, flags); |
5f338d90 RPM |
694 | |
695 | /* Check if the callback is already on the list */ | |
696 | cb = gnttab_free_callback_list; | |
697 | while (cb) { | |
698 | if (cb == callback) | |
699 | goto out; | |
700 | cb = cb->next; | |
701 | } | |
702 | ||
ad9a8612 JF |
703 | callback->fn = fn; |
704 | callback->arg = arg; | |
705 | callback->count = count; | |
706 | callback->next = gnttab_free_callback_list; | |
707 | gnttab_free_callback_list = callback; | |
708 | check_free_callbacks(); | |
709 | out: | |
710 | spin_unlock_irqrestore(&gnttab_list_lock, flags); | |
711 | } | |
712 | EXPORT_SYMBOL_GPL(gnttab_request_free_callback); | |
713 | ||
714 | void gnttab_cancel_free_callback(struct gnttab_free_callback *callback) | |
715 | { | |
716 | struct gnttab_free_callback **pcb; | |
717 | unsigned long flags; | |
718 | ||
719 | spin_lock_irqsave(&gnttab_list_lock, flags); | |
720 | for (pcb = &gnttab_free_callback_list; *pcb; pcb = &(*pcb)->next) { | |
721 | if (*pcb == callback) { | |
722 | *pcb = callback->next; | |
723 | break; | |
724 | } | |
725 | } | |
726 | spin_unlock_irqrestore(&gnttab_list_lock, flags); | |
727 | } | |
728 | EXPORT_SYMBOL_GPL(gnttab_cancel_free_callback); | |
729 | ||
83c69324 JG |
730 | static unsigned int gnttab_frames(unsigned int frames, unsigned int align) |
731 | { | |
732 | return (frames * gnttab_interface->grefs_per_grant_frame + align - 1) / | |
733 | align; | |
734 | } | |
735 | ||
ad9a8612 JF |
736 | static int grow_gnttab_list(unsigned int more_frames) |
737 | { | |
738 | unsigned int new_nr_grant_frames, extra_entries, i; | |
bbc60c18 | 739 | unsigned int nr_glist_frames, new_nr_glist_frames; |
83c69324 | 740 | unsigned int grefs_per_frame; |
ad9a8612 | 741 | |
83c69324 | 742 | grefs_per_frame = gnttab_interface->grefs_per_grant_frame; |
d0b4d64a | 743 | |
ad9a8612 | 744 | new_nr_grant_frames = nr_grant_frames + more_frames; |
83c69324 | 745 | extra_entries = more_frames * grefs_per_frame; |
ad9a8612 | 746 | |
83c69324 JG |
747 | nr_glist_frames = gnttab_frames(nr_grant_frames, RPP); |
748 | new_nr_glist_frames = gnttab_frames(new_nr_grant_frames, RPP); | |
bbc60c18 | 749 | for (i = nr_glist_frames; i < new_nr_glist_frames; i++) { |
ad9a8612 JF |
750 | gnttab_list[i] = (grant_ref_t *)__get_free_page(GFP_ATOMIC); |
751 | if (!gnttab_list[i]) | |
752 | goto grow_nomem; | |
753 | } | |
754 | ||
02a9e681 | 755 | gnttab_set_free(gnttab_size, extra_entries); |
ad9a8612 | 756 | |
02a9e681 JG |
757 | if (!gnttab_free_tail_ptr) |
758 | gnttab_free_tail_ptr = __gnttab_entry(gnttab_size); | |
ad9a8612 JF |
759 | |
760 | nr_grant_frames = new_nr_grant_frames; | |
02a9e681 | 761 | gnttab_size += extra_entries; |
ad9a8612 JF |
762 | |
763 | check_free_callbacks(); | |
764 | ||
765 | return 0; | |
766 | ||
767 | grow_nomem: | |
46e3626a | 768 | while (i-- > nr_glist_frames) |
ad9a8612 JF |
769 | free_page((unsigned long) gnttab_list[i]); |
770 | return -ENOMEM; | |
771 | } | |
772 | ||
773 | static unsigned int __max_nr_grant_frames(void) | |
774 | { | |
775 | struct gnttab_query_size query; | |
776 | int rc; | |
777 | ||
778 | query.dom = DOMID_SELF; | |
779 | ||
780 | rc = HYPERVISOR_grant_table_op(GNTTABOP_query_size, &query, 1); | |
781 | if ((rc < 0) || (query.status != GNTST_okay)) | |
782 | return 4; /* Legacy max supported number of frames */ | |
783 | ||
784 | return query.max_nr_frames; | |
785 | } | |
786 | ||
183d03cc | 787 | unsigned int gnttab_max_grant_frames(void) |
ad9a8612 JF |
788 | { |
789 | unsigned int xen_max = __max_nr_grant_frames(); | |
7f256020 KRW |
790 | static unsigned int boot_max_nr_grant_frames; |
791 | ||
792 | /* First time, initialize it properly. */ | |
793 | if (!boot_max_nr_grant_frames) | |
794 | boot_max_nr_grant_frames = __max_nr_grant_frames(); | |
ad9a8612 JF |
795 | |
796 | if (xen_max > boot_max_nr_grant_frames) | |
797 | return boot_max_nr_grant_frames; | |
798 | return xen_max; | |
799 | } | |
183d03cc | 800 | EXPORT_SYMBOL_GPL(gnttab_max_grant_frames); |
ad9a8612 | 801 | |
47c54205 | 802 | int gnttab_setup_auto_xlat_frames(phys_addr_t addr) |
efaf30a3 KRW |
803 | { |
804 | xen_pfn_t *pfn; | |
805 | unsigned int max_nr_gframes = __max_nr_grant_frames(); | |
806 | unsigned int i; | |
807 | void *vaddr; | |
808 | ||
809 | if (xen_auto_xlat_grant_frames.count) | |
810 | return -EINVAL; | |
811 | ||
41925b10 | 812 | vaddr = memremap(addr, XEN_PAGE_SIZE * max_nr_gframes, MEMREMAP_WB); |
efaf30a3 | 813 | if (vaddr == NULL) { |
47c54205 JG |
814 | pr_warn("Failed to ioremap gnttab share frames (addr=%pa)!\n", |
815 | &addr); | |
efaf30a3 KRW |
816 | return -ENOMEM; |
817 | } | |
818 | pfn = kcalloc(max_nr_gframes, sizeof(pfn[0]), GFP_KERNEL); | |
819 | if (!pfn) { | |
41925b10 | 820 | memunmap(vaddr); |
efaf30a3 KRW |
821 | return -ENOMEM; |
822 | } | |
823 | for (i = 0; i < max_nr_gframes; i++) | |
5ed5451d | 824 | pfn[i] = XEN_PFN_DOWN(addr) + i; |
efaf30a3 KRW |
825 | |
826 | xen_auto_xlat_grant_frames.vaddr = vaddr; | |
827 | xen_auto_xlat_grant_frames.pfn = pfn; | |
828 | xen_auto_xlat_grant_frames.count = max_nr_gframes; | |
829 | ||
830 | return 0; | |
831 | } | |
832 | EXPORT_SYMBOL_GPL(gnttab_setup_auto_xlat_frames); | |
833 | ||
834 | void gnttab_free_auto_xlat_frames(void) | |
835 | { | |
836 | if (!xen_auto_xlat_grant_frames.count) | |
837 | return; | |
838 | kfree(xen_auto_xlat_grant_frames.pfn); | |
41925b10 | 839 | memunmap(xen_auto_xlat_grant_frames.vaddr); |
efaf30a3 KRW |
840 | |
841 | xen_auto_xlat_grant_frames.pfn = NULL; | |
842 | xen_auto_xlat_grant_frames.count = 0; | |
843 | xen_auto_xlat_grant_frames.vaddr = NULL; | |
844 | } | |
845 | EXPORT_SYMBOL_GPL(gnttab_free_auto_xlat_frames); | |
846 | ||
8c3799ee | 847 | int gnttab_pages_set_private(int nr_pages, struct page **pages) |
ff4b156f | 848 | { |
8da7633f | 849 | int i; |
ff4b156f | 850 | |
8da7633f JH |
851 | for (i = 0; i < nr_pages; i++) { |
852 | #if BITS_PER_LONG < 64 | |
853 | struct xen_page_foreign *foreign; | |
854 | ||
855 | foreign = kzalloc(sizeof(*foreign), GFP_KERNEL); | |
8c3799ee | 856 | if (!foreign) |
8da7633f | 857 | return -ENOMEM; |
8c3799ee | 858 | |
8da7633f JH |
859 | set_page_private(pages[i], (unsigned long)foreign); |
860 | #endif | |
861 | SetPagePrivate(pages[i]); | |
862 | } | |
863 | ||
ff4b156f DV |
864 | return 0; |
865 | } | |
8c3799ee | 866 | EXPORT_SYMBOL_GPL(gnttab_pages_set_private); |
ff4b156f DV |
867 | |
868 | /** | |
8c3799ee OA |
869 | * gnttab_alloc_pages - alloc pages suitable for grant mapping into |
870 | * @nr_pages: number of pages to alloc | |
871 | * @pages: returns the pages | |
ff4b156f | 872 | */ |
8c3799ee OA |
873 | int gnttab_alloc_pages(int nr_pages, struct page **pages) |
874 | { | |
875 | int ret; | |
876 | ||
9e2369c0 | 877 | ret = xen_alloc_unpopulated_pages(nr_pages, pages); |
8c3799ee OA |
878 | if (ret < 0) |
879 | return ret; | |
880 | ||
881 | ret = gnttab_pages_set_private(nr_pages, pages); | |
882 | if (ret < 0) | |
883 | gnttab_free_pages(nr_pages, pages); | |
884 | ||
885 | return ret; | |
886 | } | |
887 | EXPORT_SYMBOL_GPL(gnttab_alloc_pages); | |
888 | ||
ee32f323 JG |
889 | #ifdef CONFIG_XEN_UNPOPULATED_ALLOC |
890 | static inline void cache_init(struct gnttab_page_cache *cache) | |
891 | { | |
892 | cache->pages = NULL; | |
893 | } | |
894 | ||
895 | static inline bool cache_empty(struct gnttab_page_cache *cache) | |
896 | { | |
897 | return !cache->pages; | |
898 | } | |
899 | ||
900 | static inline struct page *cache_deq(struct gnttab_page_cache *cache) | |
901 | { | |
902 | struct page *page; | |
903 | ||
904 | page = cache->pages; | |
905 | cache->pages = page->zone_device_data; | |
906 | ||
907 | return page; | |
908 | } | |
909 | ||
910 | static inline void cache_enq(struct gnttab_page_cache *cache, struct page *page) | |
911 | { | |
912 | page->zone_device_data = cache->pages; | |
913 | cache->pages = page; | |
914 | } | |
915 | #else | |
916 | static inline void cache_init(struct gnttab_page_cache *cache) | |
917 | { | |
918 | INIT_LIST_HEAD(&cache->pages); | |
919 | } | |
920 | ||
921 | static inline bool cache_empty(struct gnttab_page_cache *cache) | |
922 | { | |
923 | return list_empty(&cache->pages); | |
924 | } | |
925 | ||
926 | static inline struct page *cache_deq(struct gnttab_page_cache *cache) | |
927 | { | |
928 | struct page *page; | |
929 | ||
930 | page = list_first_entry(&cache->pages, struct page, lru); | |
931 | list_del(&page->lru); | |
932 | ||
933 | return page; | |
934 | } | |
935 | ||
936 | static inline void cache_enq(struct gnttab_page_cache *cache, struct page *page) | |
937 | { | |
938 | list_add(&page->lru, &cache->pages); | |
939 | } | |
940 | #endif | |
941 | ||
ca33479c JG |
942 | void gnttab_page_cache_init(struct gnttab_page_cache *cache) |
943 | { | |
944 | spin_lock_init(&cache->lock); | |
ee32f323 | 945 | cache_init(cache); |
ca33479c JG |
946 | cache->num_pages = 0; |
947 | } | |
948 | EXPORT_SYMBOL_GPL(gnttab_page_cache_init); | |
949 | ||
950 | int gnttab_page_cache_get(struct gnttab_page_cache *cache, struct page **page) | |
951 | { | |
952 | unsigned long flags; | |
953 | ||
954 | spin_lock_irqsave(&cache->lock, flags); | |
955 | ||
ee32f323 | 956 | if (cache_empty(cache)) { |
ca33479c JG |
957 | spin_unlock_irqrestore(&cache->lock, flags); |
958 | return gnttab_alloc_pages(1, page); | |
959 | } | |
960 | ||
ee32f323 | 961 | page[0] = cache_deq(cache); |
ca33479c JG |
962 | cache->num_pages--; |
963 | ||
964 | spin_unlock_irqrestore(&cache->lock, flags); | |
965 | ||
966 | return 0; | |
967 | } | |
968 | EXPORT_SYMBOL_GPL(gnttab_page_cache_get); | |
969 | ||
970 | void gnttab_page_cache_put(struct gnttab_page_cache *cache, struct page **page, | |
971 | unsigned int num) | |
972 | { | |
973 | unsigned long flags; | |
974 | unsigned int i; | |
975 | ||
976 | spin_lock_irqsave(&cache->lock, flags); | |
977 | ||
978 | for (i = 0; i < num; i++) | |
ee32f323 | 979 | cache_enq(cache, page[i]); |
ca33479c JG |
980 | cache->num_pages += num; |
981 | ||
982 | spin_unlock_irqrestore(&cache->lock, flags); | |
983 | } | |
984 | EXPORT_SYMBOL_GPL(gnttab_page_cache_put); | |
985 | ||
986 | void gnttab_page_cache_shrink(struct gnttab_page_cache *cache, unsigned int num) | |
987 | { | |
988 | struct page *page[10]; | |
989 | unsigned int i = 0; | |
990 | unsigned long flags; | |
991 | ||
992 | spin_lock_irqsave(&cache->lock, flags); | |
993 | ||
994 | while (cache->num_pages > num) { | |
ee32f323 | 995 | page[i] = cache_deq(cache); |
ca33479c JG |
996 | cache->num_pages--; |
997 | if (++i == ARRAY_SIZE(page)) { | |
998 | spin_unlock_irqrestore(&cache->lock, flags); | |
999 | gnttab_free_pages(i, page); | |
1000 | i = 0; | |
1001 | spin_lock_irqsave(&cache->lock, flags); | |
1002 | } | |
1003 | } | |
1004 | ||
1005 | spin_unlock_irqrestore(&cache->lock, flags); | |
1006 | ||
1007 | if (i != 0) | |
1008 | gnttab_free_pages(i, page); | |
1009 | } | |
1010 | EXPORT_SYMBOL_GPL(gnttab_page_cache_shrink); | |
1011 | ||
8c3799ee | 1012 | void gnttab_pages_clear_private(int nr_pages, struct page **pages) |
ff4b156f | 1013 | { |
8da7633f JH |
1014 | int i; |
1015 | ||
1016 | for (i = 0; i < nr_pages; i++) { | |
1017 | if (PagePrivate(pages[i])) { | |
1018 | #if BITS_PER_LONG < 64 | |
1019 | kfree((void *)page_private(pages[i])); | |
1020 | #endif | |
1021 | ClearPagePrivate(pages[i]); | |
1022 | } | |
1023 | } | |
8c3799ee OA |
1024 | } |
1025 | EXPORT_SYMBOL_GPL(gnttab_pages_clear_private); | |
1026 | ||
1027 | /** | |
1028 | * gnttab_free_pages - free pages allocated by gnttab_alloc_pages() | |
1029 | * @nr_pages; number of pages to free | |
1030 | * @pages: the pages | |
1031 | */ | |
1032 | void gnttab_free_pages(int nr_pages, struct page **pages) | |
1033 | { | |
1034 | gnttab_pages_clear_private(nr_pages, pages); | |
9e2369c0 | 1035 | xen_free_unpopulated_pages(nr_pages, pages); |
ff4b156f | 1036 | } |
6e3cc2a6 | 1037 | EXPORT_SYMBOL_GPL(gnttab_free_pages); |
ff4b156f | 1038 | |
9bdc7304 OA |
1039 | #ifdef CONFIG_XEN_GRANT_DMA_ALLOC |
1040 | /** | |
1041 | * gnttab_dma_alloc_pages - alloc DMAable pages suitable for grant mapping into | |
1042 | * @args: arguments to the function | |
1043 | */ | |
1044 | int gnttab_dma_alloc_pages(struct gnttab_dma_alloc_args *args) | |
1045 | { | |
1046 | unsigned long pfn, start_pfn; | |
1047 | size_t size; | |
1048 | int i, ret; | |
1049 | ||
e9ea0b30 DC |
1050 | if (args->nr_pages < 0 || args->nr_pages > (INT_MAX >> PAGE_SHIFT)) |
1051 | return -ENOMEM; | |
1052 | ||
9bdc7304 OA |
1053 | size = args->nr_pages << PAGE_SHIFT; |
1054 | if (args->coherent) | |
1055 | args->vaddr = dma_alloc_coherent(args->dev, size, | |
1056 | &args->dev_bus_addr, | |
1057 | GFP_KERNEL | __GFP_NOWARN); | |
1058 | else | |
1059 | args->vaddr = dma_alloc_wc(args->dev, size, | |
1060 | &args->dev_bus_addr, | |
1061 | GFP_KERNEL | __GFP_NOWARN); | |
1062 | if (!args->vaddr) { | |
1063 | pr_debug("Failed to allocate DMA buffer of size %zu\n", size); | |
1064 | return -ENOMEM; | |
1065 | } | |
1066 | ||
1067 | start_pfn = __phys_to_pfn(args->dev_bus_addr); | |
1068 | for (pfn = start_pfn, i = 0; pfn < start_pfn + args->nr_pages; | |
1069 | pfn++, i++) { | |
1070 | struct page *page = pfn_to_page(pfn); | |
1071 | ||
1072 | args->pages[i] = page; | |
1073 | args->frames[i] = xen_page_to_gfn(page); | |
1074 | xenmem_reservation_scrub_page(page); | |
1075 | } | |
1076 | ||
1077 | xenmem_reservation_va_mapping_reset(args->nr_pages, args->pages); | |
1078 | ||
1079 | ret = xenmem_reservation_decrease(args->nr_pages, args->frames); | |
1080 | if (ret != args->nr_pages) { | |
1081 | pr_debug("Failed to decrease reservation for DMA buffer\n"); | |
1082 | ret = -EFAULT; | |
1083 | goto fail; | |
1084 | } | |
1085 | ||
1086 | ret = gnttab_pages_set_private(args->nr_pages, args->pages); | |
1087 | if (ret < 0) | |
1088 | goto fail; | |
1089 | ||
1090 | return 0; | |
1091 | ||
1092 | fail: | |
1093 | gnttab_dma_free_pages(args); | |
1094 | return ret; | |
1095 | } | |
1096 | EXPORT_SYMBOL_GPL(gnttab_dma_alloc_pages); | |
1097 | ||
1098 | /** | |
1099 | * gnttab_dma_free_pages - free DMAable pages | |
1100 | * @args: arguments to the function | |
1101 | */ | |
1102 | int gnttab_dma_free_pages(struct gnttab_dma_alloc_args *args) | |
1103 | { | |
1104 | size_t size; | |
1105 | int i, ret; | |
1106 | ||
1107 | gnttab_pages_clear_private(args->nr_pages, args->pages); | |
1108 | ||
1109 | for (i = 0; i < args->nr_pages; i++) | |
1110 | args->frames[i] = page_to_xen_pfn(args->pages[i]); | |
1111 | ||
1112 | ret = xenmem_reservation_increase(args->nr_pages, args->frames); | |
1113 | if (ret != args->nr_pages) { | |
d9cccfa7 | 1114 | pr_debug("Failed to increase reservation for DMA buffer\n"); |
9bdc7304 OA |
1115 | ret = -EFAULT; |
1116 | } else { | |
1117 | ret = 0; | |
1118 | } | |
1119 | ||
1120 | xenmem_reservation_va_mapping_update(args->nr_pages, args->pages, | |
1121 | args->frames); | |
1122 | ||
1123 | size = args->nr_pages << PAGE_SHIFT; | |
1124 | if (args->coherent) | |
1125 | dma_free_coherent(args->dev, size, | |
1126 | args->vaddr, args->dev_bus_addr); | |
1127 | else | |
1128 | dma_free_wc(args->dev, size, | |
1129 | args->vaddr, args->dev_bus_addr); | |
1130 | return ret; | |
1131 | } | |
1132 | EXPORT_SYMBOL_GPL(gnttab_dma_free_pages); | |
1133 | #endif | |
1134 | ||
c571898f ALC |
1135 | /* Handling of paged out grant targets (GNTST_eagain) */ |
1136 | #define MAX_DELAY 256 | |
1137 | static inline void | |
1138 | gnttab_retry_eagain_gop(unsigned int cmd, void *gop, int16_t *status, | |
1139 | const char *func) | |
1140 | { | |
1141 | unsigned delay = 1; | |
1142 | ||
1143 | do { | |
1144 | BUG_ON(HYPERVISOR_grant_table_op(cmd, gop, 1)); | |
1145 | if (*status == GNTST_eagain) | |
1146 | msleep(delay++); | |
1147 | } while ((*status == GNTST_eagain) && (delay < MAX_DELAY)); | |
1148 | ||
1149 | if (delay >= MAX_DELAY) { | |
283c0972 | 1150 | pr_err("%s: %s eagain grant\n", func, current->comm); |
c571898f ALC |
1151 | *status = GNTST_bad_page; |
1152 | } | |
1153 | } | |
1154 | ||
1155 | void gnttab_batch_map(struct gnttab_map_grant_ref *batch, unsigned count) | |
1156 | { | |
1157 | struct gnttab_map_grant_ref *op; | |
1158 | ||
1159 | if (HYPERVISOR_grant_table_op(GNTTABOP_map_grant_ref, batch, count)) | |
1160 | BUG(); | |
1161 | for (op = batch; op < batch + count; op++) | |
1162 | if (op->status == GNTST_eagain) | |
1163 | gnttab_retry_eagain_gop(GNTTABOP_map_grant_ref, op, | |
1164 | &op->status, __func__); | |
1165 | } | |
1166 | EXPORT_SYMBOL_GPL(gnttab_batch_map); | |
1167 | ||
1168 | void gnttab_batch_copy(struct gnttab_copy *batch, unsigned count) | |
1169 | { | |
1170 | struct gnttab_copy *op; | |
1171 | ||
1172 | if (HYPERVISOR_grant_table_op(GNTTABOP_copy, batch, count)) | |
1173 | BUG(); | |
1174 | for (op = batch; op < batch + count; op++) | |
1175 | if (op->status == GNTST_eagain) | |
1176 | gnttab_retry_eagain_gop(GNTTABOP_copy, op, | |
1177 | &op->status, __func__); | |
1178 | } | |
1179 | EXPORT_SYMBOL_GPL(gnttab_batch_copy); | |
1180 | ||
008c320a JG |
1181 | void gnttab_foreach_grant_in_range(struct page *page, |
1182 | unsigned int offset, | |
1183 | unsigned int len, | |
1184 | xen_grant_fn_t fn, | |
1185 | void *data) | |
1186 | { | |
1187 | unsigned int goffset; | |
1188 | unsigned int glen; | |
1189 | unsigned long xen_pfn; | |
1190 | ||
1191 | len = min_t(unsigned int, PAGE_SIZE - offset, len); | |
1192 | goffset = xen_offset_in_page(offset); | |
1193 | ||
1194 | xen_pfn = page_to_xen_pfn(page) + XEN_PFN_DOWN(offset); | |
1195 | ||
1196 | while (len) { | |
1197 | glen = min_t(unsigned int, XEN_PAGE_SIZE - goffset, len); | |
1198 | fn(pfn_to_gfn(xen_pfn), goffset, glen, data); | |
1199 | ||
1200 | goffset = 0; | |
1201 | xen_pfn++; | |
1202 | len -= glen; | |
1203 | } | |
1204 | } | |
1205 | EXPORT_SYMBOL_GPL(gnttab_foreach_grant_in_range); | |
1206 | ||
f73314b2 JG |
1207 | void gnttab_foreach_grant(struct page **pages, |
1208 | unsigned int nr_grefs, | |
1209 | xen_grant_fn_t fn, | |
1210 | void *data) | |
1211 | { | |
1212 | unsigned int goffset = 0; | |
1213 | unsigned long xen_pfn = 0; | |
1214 | unsigned int i; | |
1215 | ||
1216 | for (i = 0; i < nr_grefs; i++) { | |
1217 | if ((i % XEN_PFN_PER_PAGE) == 0) { | |
1218 | xen_pfn = page_to_xen_pfn(pages[i / XEN_PFN_PER_PAGE]); | |
1219 | goffset = 0; | |
1220 | } | |
1221 | ||
1222 | fn(pfn_to_gfn(xen_pfn), goffset, XEN_PAGE_SIZE, data); | |
1223 | ||
1224 | goffset += XEN_PAGE_SIZE; | |
1225 | xen_pfn++; | |
1226 | } | |
1227 | } | |
1228 | ||
e85fc980 | 1229 | int gnttab_map_refs(struct gnttab_map_grant_ref *map_ops, |
c123799a | 1230 | struct gnttab_map_grant_ref *kmap_ops, |
e85fc980 | 1231 | struct page **pages, unsigned int count) |
289b777e SS |
1232 | { |
1233 | int i, ret; | |
289b777e SS |
1234 | |
1235 | ret = HYPERVISOR_grant_table_op(GNTTABOP_map_grant_ref, map_ops, count); | |
87f1d40a JF |
1236 | if (ret) |
1237 | return ret; | |
289b777e | 1238 | |
8da7633f | 1239 | for (i = 0; i < count; i++) { |
d59f5324 JG |
1240 | switch (map_ops[i].status) { |
1241 | case GNTST_okay: | |
1242 | { | |
8da7633f JH |
1243 | struct xen_page_foreign *foreign; |
1244 | ||
1245 | SetPageForeign(pages[i]); | |
1246 | foreign = xen_page_foreign(pages[i]); | |
1247 | foreign->domid = map_ops[i].dom; | |
1248 | foreign->gref = map_ops[i].ref; | |
d59f5324 JG |
1249 | break; |
1250 | } | |
1251 | ||
1252 | case GNTST_no_device_space: | |
1253 | pr_warn_ratelimited("maptrack limit reached, can't map all guest pages\n"); | |
1254 | break; | |
1255 | ||
1256 | case GNTST_eagain: | |
1257 | /* Retry eagain maps */ | |
1258 | gnttab_retry_eagain_gop(GNTTABOP_map_grant_ref, | |
1259 | map_ops + i, | |
1260 | &map_ops[i].status, __func__); | |
1261 | /* Test status in next loop iteration. */ | |
1262 | i--; | |
1263 | break; | |
1264 | ||
1265 | default: | |
1266 | break; | |
8da7633f JH |
1267 | } |
1268 | } | |
1269 | ||
1429d46d | 1270 | return set_foreign_p2m_mapping(map_ops, kmap_ops, pages, count); |
289b777e SS |
1271 | } |
1272 | EXPORT_SYMBOL_GPL(gnttab_map_refs); | |
1273 | ||
e85fc980 | 1274 | int gnttab_unmap_refs(struct gnttab_unmap_grant_ref *unmap_ops, |
853d0289 | 1275 | struct gnttab_unmap_grant_ref *kunmap_ops, |
e85fc980 | 1276 | struct page **pages, unsigned int count) |
289b777e | 1277 | { |
8da7633f | 1278 | unsigned int i; |
1429d46d | 1279 | int ret; |
289b777e SS |
1280 | |
1281 | ret = HYPERVISOR_grant_table_op(GNTTABOP_unmap_grant_ref, unmap_ops, count); | |
87f1d40a JF |
1282 | if (ret) |
1283 | return ret; | |
1284 | ||
8da7633f JH |
1285 | for (i = 0; i < count; i++) |
1286 | ClearPageForeign(pages[i]); | |
1287 | ||
853d0289 | 1288 | return clear_foreign_p2m_mapping(unmap_ops, kunmap_ops, pages, count); |
289b777e SS |
1289 | } |
1290 | EXPORT_SYMBOL_GPL(gnttab_unmap_refs); | |
1291 | ||
3f9f1c67 JH |
1292 | #define GNTTAB_UNMAP_REFS_DELAY 5 |
1293 | ||
1294 | static void __gnttab_unmap_refs_async(struct gntab_unmap_queue_data* item); | |
1295 | ||
1296 | static void gnttab_unmap_work(struct work_struct *work) | |
1297 | { | |
1298 | struct gntab_unmap_queue_data | |
1299 | *unmap_data = container_of(work, | |
1300 | struct gntab_unmap_queue_data, | |
1301 | gnttab_work.work); | |
1302 | if (unmap_data->age != UINT_MAX) | |
1303 | unmap_data->age++; | |
1304 | __gnttab_unmap_refs_async(unmap_data); | |
1305 | } | |
1306 | ||
1307 | static void __gnttab_unmap_refs_async(struct gntab_unmap_queue_data* item) | |
1308 | { | |
1309 | int ret; | |
1310 | int pc; | |
1311 | ||
1312 | for (pc = 0; pc < item->count; pc++) { | |
1313 | if (page_count(item->pages[pc]) > 1) { | |
1314 | unsigned long delay = GNTTAB_UNMAP_REFS_DELAY * (item->age + 1); | |
1315 | schedule_delayed_work(&item->gnttab_work, | |
1316 | msecs_to_jiffies(delay)); | |
1317 | return; | |
1318 | } | |
1319 | } | |
1320 | ||
1321 | ret = gnttab_unmap_refs(item->unmap_ops, item->kunmap_ops, | |
1322 | item->pages, item->count); | |
1323 | item->done(ret, item); | |
1324 | } | |
1325 | ||
1326 | void gnttab_unmap_refs_async(struct gntab_unmap_queue_data* item) | |
1327 | { | |
1328 | INIT_DELAYED_WORK(&item->gnttab_work, gnttab_unmap_work); | |
1329 | item->age = 0; | |
1330 | ||
1331 | __gnttab_unmap_refs_async(item); | |
1332 | } | |
1333 | EXPORT_SYMBOL_GPL(gnttab_unmap_refs_async); | |
1334 | ||
b44166cd BL |
1335 | static void unmap_refs_callback(int result, |
1336 | struct gntab_unmap_queue_data *data) | |
1337 | { | |
1338 | struct unmap_refs_callback_data *d = data->data; | |
1339 | ||
1340 | d->result = result; | |
1341 | complete(&d->completion); | |
1342 | } | |
1343 | ||
1344 | int gnttab_unmap_refs_sync(struct gntab_unmap_queue_data *item) | |
1345 | { | |
1346 | struct unmap_refs_callback_data data; | |
1347 | ||
1348 | init_completion(&data.completion); | |
1349 | item->data = &data; | |
1350 | item->done = &unmap_refs_callback; | |
1351 | gnttab_unmap_refs_async(item); | |
1352 | wait_for_completion(&data.completion); | |
1353 | ||
1354 | return data.result; | |
1355 | } | |
1356 | EXPORT_SYMBOL_GPL(gnttab_unmap_refs_sync); | |
1357 | ||
b988b8ff JG |
1358 | static unsigned int nr_status_frames(unsigned int nr_grant_frames) |
1359 | { | |
83c69324 | 1360 | return gnttab_frames(nr_grant_frames, SPP); |
b988b8ff JG |
1361 | } |
1362 | ||
ef32f892 | 1363 | static int gnttab_map_frames_v1(xen_pfn_t *frames, unsigned int nr_gframes) |
0f9f5a95 AL |
1364 | { |
1365 | int rc; | |
1366 | ||
1367 | rc = arch_gnttab_map_shared(frames, nr_gframes, | |
1368 | gnttab_max_grant_frames(), | |
1369 | &gnttab_shared.addr); | |
1370 | BUG_ON(rc); | |
1371 | ||
1372 | return 0; | |
1373 | } | |
1374 | ||
1375 | static void gnttab_unmap_frames_v1(void) | |
1376 | { | |
85ff6acb AL |
1377 | arch_gnttab_unmap(gnttab_shared.addr, nr_grant_frames); |
1378 | } | |
1379 | ||
b988b8ff JG |
1380 | static int gnttab_map_frames_v2(xen_pfn_t *frames, unsigned int nr_gframes) |
1381 | { | |
1382 | uint64_t *sframes; | |
1383 | unsigned int nr_sframes; | |
1384 | struct gnttab_get_status_frames getframes; | |
1385 | int rc; | |
1386 | ||
1387 | nr_sframes = nr_status_frames(nr_gframes); | |
1388 | ||
1389 | /* No need for kzalloc as it is initialized in following hypercall | |
1390 | * GNTTABOP_get_status_frames. | |
1391 | */ | |
1392 | sframes = kmalloc_array(nr_sframes, sizeof(uint64_t), GFP_ATOMIC); | |
1393 | if (!sframes) | |
1394 | return -ENOMEM; | |
1395 | ||
1396 | getframes.dom = DOMID_SELF; | |
1397 | getframes.nr_frames = nr_sframes; | |
1398 | set_xen_guest_handle(getframes.frame_list, sframes); | |
1399 | ||
1400 | rc = HYPERVISOR_grant_table_op(GNTTABOP_get_status_frames, | |
1401 | &getframes, 1); | |
1402 | if (rc == -ENOSYS) { | |
1403 | kfree(sframes); | |
1404 | return -ENOSYS; | |
1405 | } | |
1406 | ||
1407 | BUG_ON(rc || getframes.status); | |
1408 | ||
1409 | rc = arch_gnttab_map_status(sframes, nr_sframes, | |
1410 | nr_status_frames(gnttab_max_grant_frames()), | |
1411 | &grstatus); | |
1412 | BUG_ON(rc); | |
1413 | kfree(sframes); | |
1414 | ||
1415 | rc = arch_gnttab_map_shared(frames, nr_gframes, | |
1416 | gnttab_max_grant_frames(), | |
1417 | &gnttab_shared.addr); | |
1418 | BUG_ON(rc); | |
1419 | ||
1420 | return 0; | |
1421 | } | |
1422 | ||
1423 | static void gnttab_unmap_frames_v2(void) | |
1424 | { | |
1425 | arch_gnttab_unmap(gnttab_shared.addr, nr_grant_frames); | |
1426 | arch_gnttab_unmap(grstatus, nr_status_frames(nr_grant_frames)); | |
1427 | } | |
1428 | ||
ad9a8612 JF |
1429 | static int gnttab_map(unsigned int start_idx, unsigned int end_idx) |
1430 | { | |
1431 | struct gnttab_setup_table setup; | |
ef32f892 | 1432 | xen_pfn_t *frames; |
ad9a8612 JF |
1433 | unsigned int nr_gframes = end_idx + 1; |
1434 | int rc; | |
1435 | ||
6926f6d6 | 1436 | if (xen_feature(XENFEAT_auto_translated_physmap)) { |
183d03cc SS |
1437 | struct xen_add_to_physmap xatp; |
1438 | unsigned int i = end_idx; | |
1439 | rc = 0; | |
efaf30a3 | 1440 | BUG_ON(xen_auto_xlat_grant_frames.count < nr_gframes); |
183d03cc SS |
1441 | /* |
1442 | * Loop backwards, so that the first hypercall has the largest | |
1443 | * index, ensuring that the table will grow only once. | |
1444 | */ | |
1445 | do { | |
1446 | xatp.domid = DOMID_SELF; | |
1447 | xatp.idx = i; | |
1448 | xatp.space = XENMAPSPACE_grant_table; | |
efaf30a3 | 1449 | xatp.gpfn = xen_auto_xlat_grant_frames.pfn[i]; |
183d03cc SS |
1450 | rc = HYPERVISOR_memory_op(XENMEM_add_to_physmap, &xatp); |
1451 | if (rc != 0) { | |
283c0972 JP |
1452 | pr_warn("grant table add_to_physmap failed, err=%d\n", |
1453 | rc); | |
183d03cc SS |
1454 | break; |
1455 | } | |
1456 | } while (i-- > start_idx); | |
1457 | ||
1458 | return rc; | |
1459 | } | |
1460 | ||
85ff6acb AL |
1461 | /* No need for kzalloc as it is initialized in following hypercall |
1462 | * GNTTABOP_setup_table. | |
1463 | */ | |
6da2ec56 | 1464 | frames = kmalloc_array(nr_gframes, sizeof(unsigned long), GFP_ATOMIC); |
ad9a8612 JF |
1465 | if (!frames) |
1466 | return -ENOMEM; | |
1467 | ||
1468 | setup.dom = DOMID_SELF; | |
1469 | setup.nr_frames = nr_gframes; | |
87e27cf6 | 1470 | set_xen_guest_handle(setup.frame_list, frames); |
ad9a8612 JF |
1471 | |
1472 | rc = HYPERVISOR_grant_table_op(GNTTABOP_setup_table, &setup, 1); | |
1473 | if (rc == -ENOSYS) { | |
1474 | kfree(frames); | |
1475 | return -ENOSYS; | |
1476 | } | |
1477 | ||
1478 | BUG_ON(rc || setup.status); | |
1479 | ||
0f9f5a95 | 1480 | rc = gnttab_interface->map_frames(frames, nr_gframes); |
ad9a8612 JF |
1481 | |
1482 | kfree(frames); | |
1483 | ||
0f9f5a95 AL |
1484 | return rc; |
1485 | } | |
1486 | ||
86fc2136 | 1487 | static const struct gnttab_ops gnttab_v1_ops = { |
83c69324 JG |
1488 | .version = 1, |
1489 | .grefs_per_grant_frame = XEN_PAGE_SIZE / | |
1490 | sizeof(struct grant_entry_v1), | |
0f9f5a95 AL |
1491 | .map_frames = gnttab_map_frames_v1, |
1492 | .unmap_frames = gnttab_unmap_frames_v1, | |
1493 | .update_entry = gnttab_update_entry_v1, | |
1494 | .end_foreign_access_ref = gnttab_end_foreign_access_ref_v1, | |
42baefac | 1495 | .read_frame = gnttab_read_frame_v1, |
0f9f5a95 AL |
1496 | }; |
1497 | ||
b988b8ff | 1498 | static const struct gnttab_ops gnttab_v2_ops = { |
83c69324 JG |
1499 | .version = 2, |
1500 | .grefs_per_grant_frame = XEN_PAGE_SIZE / | |
1501 | sizeof(union grant_entry_v2), | |
b988b8ff JG |
1502 | .map_frames = gnttab_map_frames_v2, |
1503 | .unmap_frames = gnttab_unmap_frames_v2, | |
1504 | .update_entry = gnttab_update_entry_v2, | |
1505 | .end_foreign_access_ref = gnttab_end_foreign_access_ref_v2, | |
42baefac | 1506 | .read_frame = gnttab_read_frame_v2, |
b988b8ff JG |
1507 | }; |
1508 | ||
8dca4d96 | 1509 | static bool gnttab_need_v2(void) |
0f9f5a95 | 1510 | { |
8dca4d96 JG |
1511 | #ifdef CONFIG_X86 |
1512 | uint32_t base, width; | |
1513 | ||
1514 | if (xen_pv_domain()) { | |
1515 | base = xen_cpuid_base(); | |
1516 | if (cpuid_eax(base) < 5) | |
1517 | return false; /* Information not available, use V1. */ | |
1518 | width = cpuid_ebx(base + 5) & | |
1519 | XEN_CPUID_MACHINE_ADDRESS_WIDTH_MASK; | |
1520 | return width > 32 + PAGE_SHIFT; | |
1521 | } | |
1522 | #endif | |
1523 | return !!(max_possible_pfn >> 32); | |
1524 | } | |
85ff6acb | 1525 | |
0f9f5a95 AL |
1526 | static void gnttab_request_version(void) |
1527 | { | |
8dca4d96 | 1528 | long rc; |
b988b8ff | 1529 | struct gnttab_set_version gsv; |
85ff6acb | 1530 | |
8dca4d96 JG |
1531 | if (gnttab_need_v2()) |
1532 | gsv.version = 2; | |
1533 | else | |
1534 | gsv.version = 1; | |
1535 | ||
1536 | /* Boot parameter overrides automatic selection. */ | |
1537 | if (xen_gnttab_version >= 1 && xen_gnttab_version <= 2) | |
1538 | gsv.version = xen_gnttab_version; | |
b988b8ff JG |
1539 | |
1540 | rc = HYPERVISOR_grant_table_op(GNTTABOP_set_version, &gsv, 1); | |
83c69324 | 1541 | if (rc == 0 && gsv.version == 2) |
b988b8ff | 1542 | gnttab_interface = &gnttab_v2_ops; |
83c69324 | 1543 | else |
b988b8ff | 1544 | gnttab_interface = &gnttab_v1_ops; |
83c69324 JG |
1545 | pr_info("Grant tables using version %d layout\n", |
1546 | gnttab_interface->version); | |
ad9a8612 JF |
1547 | } |
1548 | ||
d0b4d64a | 1549 | static int gnttab_setup(void) |
ad9a8612 | 1550 | { |
183d03cc SS |
1551 | unsigned int max_nr_gframes; |
1552 | ||
1553 | max_nr_gframes = gnttab_max_grant_frames(); | |
1554 | if (max_nr_gframes < nr_grant_frames) | |
ad9a8612 | 1555 | return -ENOSYS; |
183d03cc | 1556 | |
45684753 | 1557 | if (xen_feature(XENFEAT_auto_translated_physmap) && gnttab_shared.addr == NULL) { |
efaf30a3 | 1558 | gnttab_shared.addr = xen_auto_xlat_grant_frames.vaddr; |
0f9f5a95 | 1559 | if (gnttab_shared.addr == NULL) { |
574878f9 | 1560 | pr_warn("gnttab share frames is not mapped!\n"); |
183d03cc SS |
1561 | return -ENOMEM; |
1562 | } | |
1563 | } | |
45684753 | 1564 | return gnttab_map(0, nr_grant_frames - 1); |
ad9a8612 JF |
1565 | } |
1566 | ||
d0b4d64a MW |
1567 | int gnttab_resume(void) |
1568 | { | |
1569 | gnttab_request_version(); | |
1570 | return gnttab_setup(); | |
1571 | } | |
1572 | ||
0e91398f | 1573 | int gnttab_suspend(void) |
ad9a8612 | 1574 | { |
13cd36a3 DV |
1575 | if (!xen_feature(XENFEAT_auto_translated_physmap)) |
1576 | gnttab_interface->unmap_frames(); | |
ad9a8612 JF |
1577 | return 0; |
1578 | } | |
1579 | ||
1580 | static int gnttab_expand(unsigned int req_entries) | |
1581 | { | |
1582 | int rc; | |
1583 | unsigned int cur, extra; | |
1584 | ||
1585 | cur = nr_grant_frames; | |
83c69324 JG |
1586 | extra = ((req_entries + gnttab_interface->grefs_per_grant_frame - 1) / |
1587 | gnttab_interface->grefs_per_grant_frame); | |
29d11cfd WW |
1588 | if (cur + extra > gnttab_max_grant_frames()) { |
1589 | pr_warn_ratelimited("xen/grant-table: max_grant_frames reached" | |
1590 | " cur=%u extra=%u limit=%u" | |
1591 | " gnttab_free_count=%u req_entries=%u\n", | |
1592 | cur, extra, gnttab_max_grant_frames(), | |
1593 | gnttab_free_count, req_entries); | |
ad9a8612 | 1594 | return -ENOSPC; |
29d11cfd | 1595 | } |
ad9a8612 JF |
1596 | |
1597 | rc = gnttab_map(cur, cur + extra - 1); | |
1598 | if (rc == 0) | |
1599 | rc = grow_gnttab_list(extra); | |
1600 | ||
1601 | return rc; | |
1602 | } | |
1603 | ||
183d03cc | 1604 | int gnttab_init(void) |
ad9a8612 JF |
1605 | { |
1606 | int i; | |
02a9e681 | 1607 | unsigned long max_nr_grant_frames, max_nr_grefs; |
bbc60c18 | 1608 | unsigned int max_nr_glist_frames, nr_glist_frames; |
6b5e7d9e | 1609 | int ret; |
ad9a8612 | 1610 | |
d0b4d64a | 1611 | gnttab_request_version(); |
162e3717 | 1612 | max_nr_grant_frames = gnttab_max_grant_frames(); |
02a9e681 JG |
1613 | max_nr_grefs = max_nr_grant_frames * |
1614 | gnttab_interface->grefs_per_grant_frame; | |
ad9a8612 | 1615 | nr_grant_frames = 1; |
ad9a8612 JF |
1616 | |
1617 | /* Determine the maximum number of frames required for the | |
1618 | * grant reference free list on the current hypervisor. | |
1619 | */ | |
02a9e681 | 1620 | max_nr_glist_frames = max_nr_grefs / RPP; |
ad9a8612 | 1621 | |
6da2ec56 KC |
1622 | gnttab_list = kmalloc_array(max_nr_glist_frames, |
1623 | sizeof(grant_ref_t *), | |
1624 | GFP_KERNEL); | |
ad9a8612 JF |
1625 | if (gnttab_list == NULL) |
1626 | return -ENOMEM; | |
1627 | ||
83c69324 | 1628 | nr_glist_frames = gnttab_frames(nr_grant_frames, RPP); |
bbc60c18 | 1629 | for (i = 0; i < nr_glist_frames; i++) { |
ad9a8612 | 1630 | gnttab_list[i] = (grant_ref_t *)__get_free_page(GFP_KERNEL); |
6b5e7d9e JL |
1631 | if (gnttab_list[i] == NULL) { |
1632 | ret = -ENOMEM; | |
ad9a8612 | 1633 | goto ini_nomem; |
6b5e7d9e | 1634 | } |
ad9a8612 JF |
1635 | } |
1636 | ||
02a9e681 JG |
1637 | gnttab_free_bitmap = bitmap_zalloc(max_nr_grefs, GFP_KERNEL); |
1638 | if (!gnttab_free_bitmap) { | |
1639 | ret = -ENOMEM; | |
1640 | goto ini_nomem; | |
1641 | } | |
1642 | ||
b988b8ff JG |
1643 | ret = arch_gnttab_init(max_nr_grant_frames, |
1644 | nr_status_frames(max_nr_grant_frames)); | |
162e3717 DV |
1645 | if (ret < 0) |
1646 | goto ini_nomem; | |
1647 | ||
d0b4d64a | 1648 | if (gnttab_setup() < 0) { |
6b5e7d9e JL |
1649 | ret = -ENODEV; |
1650 | goto ini_nomem; | |
1651 | } | |
ad9a8612 | 1652 | |
02a9e681 | 1653 | gnttab_size = nr_grant_frames * gnttab_interface->grefs_per_grant_frame; |
ad9a8612 | 1654 | |
02a9e681 JG |
1655 | gnttab_set_free(GNTTAB_NR_RESERVED_ENTRIES, |
1656 | gnttab_size - GNTTAB_NR_RESERVED_ENTRIES); | |
ad9a8612 JF |
1657 | |
1658 | printk("Grant table initialized\n"); | |
1659 | return 0; | |
1660 | ||
1661 | ini_nomem: | |
1662 | for (i--; i >= 0; i--) | |
1663 | free_page((unsigned long)gnttab_list[i]); | |
1664 | kfree(gnttab_list); | |
02a9e681 | 1665 | bitmap_free(gnttab_free_bitmap); |
6b5e7d9e | 1666 | return ret; |
ad9a8612 | 1667 | } |
183d03cc SS |
1668 | EXPORT_SYMBOL_GPL(gnttab_init); |
1669 | ||
345a5255 | 1670 | static int __gnttab_init(void) |
183d03cc | 1671 | { |
8613d78a BO |
1672 | if (!xen_domain()) |
1673 | return -ENODEV; | |
1674 | ||
183d03cc | 1675 | /* Delay grant-table initialization in the PV on HVM case */ |
8613d78a | 1676 | if (xen_hvm_domain() && !xen_pvh_domain()) |
183d03cc SS |
1677 | return 0; |
1678 | ||
183d03cc SS |
1679 | return gnttab_init(); |
1680 | } | |
6926f6d6 KRW |
1681 | /* Starts after core_initcall so that xen_pvh_gnttab_setup can be called |
1682 | * beforehand to initialize xen_auto_xlat_grant_frames. */ | |
1683 | core_initcall_sync(__gnttab_init); |