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43aa3132 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
9aa8b50b S |
2 | /* |
3 | * Copyright (c) 2012, Microsoft Corporation. | |
4 | * | |
5 | * Author: | |
6 | * K. Y. Srinivasan <kys@microsoft.com> | |
9aa8b50b S |
7 | */ |
8 | ||
9 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt | |
10 | ||
11 | #include <linux/kernel.h> | |
ae339336 | 12 | #include <linux/jiffies.h> |
9aa8b50b | 13 | #include <linux/mman.h> |
d180e0a1 | 14 | #include <linux/debugfs.h> |
9aa8b50b S |
15 | #include <linux/delay.h> |
16 | #include <linux/init.h> | |
17 | #include <linux/module.h> | |
18 | #include <linux/slab.h> | |
19 | #include <linux/kthread.h> | |
20 | #include <linux/completion.h> | |
b3d6dd09 | 21 | #include <linux/count_zeros.h> |
9aa8b50b S |
22 | #include <linux/memory_hotplug.h> |
23 | #include <linux/memory.h> | |
24 | #include <linux/notifier.h> | |
9aa8b50b | 25 | #include <linux/percpu_counter.h> |
6dc2a774 | 26 | #include <linux/page_reporting.h> |
9aa8b50b S |
27 | |
28 | #include <linux/hyperv.h> | |
2af5e7b7 | 29 | #include <asm/hyperv-tlfs.h> |
9aa8b50b | 30 | |
25bd2b2f DC |
31 | #include <asm/mshyperv.h> |
32 | ||
cf21be91 VK |
33 | #define CREATE_TRACE_POINTS |
34 | #include "hv_trace_balloon.h" | |
35 | ||
9aa8b50b S |
36 | /* |
37 | * We begin with definitions supporting the Dynamic Memory protocol | |
38 | * with the host. | |
39 | * | |
40 | * Begin protocol definitions. | |
41 | */ | |
42 | ||
43 | ||
44 | ||
45 | /* | |
46 | * Protocol versions. The low word is the minor version, the high word the major | |
47 | * version. | |
48 | * | |
49 | * History: | |
50 | * Initial version 1.0 | |
51 | * Changed to 0.1 on 2009/03/25 | |
52 | * Changes to 0.2 on 2009/05/14 | |
53 | * Changes to 0.3 on 2009/12/03 | |
54 | * Changed to 1.0 on 2011/04/05 | |
55 | */ | |
56 | ||
57 | #define DYNMEM_MAKE_VERSION(Major, Minor) ((__u32)(((Major) << 16) | (Minor))) | |
58 | #define DYNMEM_MAJOR_VERSION(Version) ((__u32)(Version) >> 16) | |
59 | #define DYNMEM_MINOR_VERSION(Version) ((__u32)(Version) & 0xff) | |
60 | ||
61 | enum { | |
62 | DYNMEM_PROTOCOL_VERSION_1 = DYNMEM_MAKE_VERSION(0, 3), | |
63 | DYNMEM_PROTOCOL_VERSION_2 = DYNMEM_MAKE_VERSION(1, 0), | |
b6ddeae1 | 64 | DYNMEM_PROTOCOL_VERSION_3 = DYNMEM_MAKE_VERSION(2, 0), |
9aa8b50b S |
65 | |
66 | DYNMEM_PROTOCOL_VERSION_WIN7 = DYNMEM_PROTOCOL_VERSION_1, | |
67 | DYNMEM_PROTOCOL_VERSION_WIN8 = DYNMEM_PROTOCOL_VERSION_2, | |
b6ddeae1 | 68 | DYNMEM_PROTOCOL_VERSION_WIN10 = DYNMEM_PROTOCOL_VERSION_3, |
9aa8b50b | 69 | |
b6ddeae1 | 70 | DYNMEM_PROTOCOL_VERSION_CURRENT = DYNMEM_PROTOCOL_VERSION_WIN10 |
9aa8b50b S |
71 | }; |
72 | ||
73 | ||
74 | ||
75 | /* | |
76 | * Message Types | |
77 | */ | |
78 | ||
79 | enum dm_message_type { | |
80 | /* | |
81 | * Version 0.3 | |
82 | */ | |
83 | DM_ERROR = 0, | |
84 | DM_VERSION_REQUEST = 1, | |
85 | DM_VERSION_RESPONSE = 2, | |
86 | DM_CAPABILITIES_REPORT = 3, | |
87 | DM_CAPABILITIES_RESPONSE = 4, | |
88 | DM_STATUS_REPORT = 5, | |
89 | DM_BALLOON_REQUEST = 6, | |
90 | DM_BALLOON_RESPONSE = 7, | |
91 | DM_UNBALLOON_REQUEST = 8, | |
92 | DM_UNBALLOON_RESPONSE = 9, | |
93 | DM_MEM_HOT_ADD_REQUEST = 10, | |
94 | DM_MEM_HOT_ADD_RESPONSE = 11, | |
95 | DM_VERSION_03_MAX = 11, | |
96 | /* | |
97 | * Version 1.0. | |
98 | */ | |
99 | DM_INFO_MESSAGE = 12, | |
100 | DM_VERSION_1_MAX = 12 | |
101 | }; | |
102 | ||
103 | ||
104 | /* | |
105 | * Structures defining the dynamic memory management | |
106 | * protocol. | |
107 | */ | |
108 | ||
109 | union dm_version { | |
110 | struct { | |
111 | __u16 minor_version; | |
112 | __u16 major_version; | |
113 | }; | |
114 | __u32 version; | |
115 | } __packed; | |
116 | ||
117 | ||
118 | union dm_caps { | |
119 | struct { | |
120 | __u64 balloon:1; | |
121 | __u64 hot_add:1; | |
647965a2 S |
122 | /* |
123 | * To support guests that may have alignment | |
124 | * limitations on hot-add, the guest can specify | |
125 | * its alignment requirements; a value of n | |
126 | * represents an alignment of 2^n in mega bytes. | |
127 | */ | |
128 | __u64 hot_add_alignment:4; | |
129 | __u64 reservedz:58; | |
9aa8b50b S |
130 | } cap_bits; |
131 | __u64 caps; | |
132 | } __packed; | |
133 | ||
134 | union dm_mem_page_range { | |
135 | struct { | |
136 | /* | |
137 | * The PFN number of the first page in the range. | |
138 | * 40 bits is the architectural limit of a PFN | |
139 | * number for AMD64. | |
140 | */ | |
141 | __u64 start_page:40; | |
142 | /* | |
143 | * The number of pages in the range. | |
144 | */ | |
145 | __u64 page_cnt:24; | |
146 | } finfo; | |
147 | __u64 page_range; | |
148 | } __packed; | |
149 | ||
150 | ||
151 | ||
152 | /* | |
153 | * The header for all dynamic memory messages: | |
154 | * | |
155 | * type: Type of the message. | |
156 | * size: Size of the message in bytes; including the header. | |
157 | * trans_id: The guest is responsible for manufacturing this ID. | |
158 | */ | |
159 | ||
160 | struct dm_header { | |
161 | __u16 type; | |
162 | __u16 size; | |
163 | __u32 trans_id; | |
164 | } __packed; | |
165 | ||
166 | /* | |
167 | * A generic message format for dynamic memory. | |
168 | * Specific message formats are defined later in the file. | |
169 | */ | |
170 | ||
171 | struct dm_message { | |
172 | struct dm_header hdr; | |
173 | __u8 data[]; /* enclosed message */ | |
174 | } __packed; | |
175 | ||
176 | ||
177 | /* | |
178 | * Specific message types supporting the dynamic memory protocol. | |
179 | */ | |
180 | ||
181 | /* | |
182 | * Version negotiation message. Sent from the guest to the host. | |
183 | * The guest is free to try different versions until the host | |
184 | * accepts the version. | |
185 | * | |
186 | * dm_version: The protocol version requested. | |
187 | * is_last_attempt: If TRUE, this is the last version guest will request. | |
188 | * reservedz: Reserved field, set to zero. | |
189 | */ | |
190 | ||
191 | struct dm_version_request { | |
192 | struct dm_header hdr; | |
193 | union dm_version version; | |
194 | __u32 is_last_attempt:1; | |
195 | __u32 reservedz:31; | |
196 | } __packed; | |
197 | ||
198 | /* | |
199 | * Version response message; Host to Guest and indicates | |
200 | * if the host has accepted the version sent by the guest. | |
201 | * | |
202 | * is_accepted: If TRUE, host has accepted the version and the guest | |
203 | * should proceed to the next stage of the protocol. FALSE indicates that | |
204 | * guest should re-try with a different version. | |
205 | * | |
206 | * reservedz: Reserved field, set to zero. | |
207 | */ | |
208 | ||
209 | struct dm_version_response { | |
210 | struct dm_header hdr; | |
211 | __u64 is_accepted:1; | |
212 | __u64 reservedz:63; | |
213 | } __packed; | |
214 | ||
215 | /* | |
216 | * Message reporting capabilities. This is sent from the guest to the | |
217 | * host. | |
218 | */ | |
219 | ||
220 | struct dm_capabilities { | |
221 | struct dm_header hdr; | |
222 | union dm_caps caps; | |
223 | __u64 min_page_cnt; | |
224 | __u64 max_page_number; | |
225 | } __packed; | |
226 | ||
227 | /* | |
228 | * Response to the capabilities message. This is sent from the host to the | |
229 | * guest. This message notifies if the host has accepted the guest's | |
230 | * capabilities. If the host has not accepted, the guest must shutdown | |
231 | * the service. | |
232 | * | |
233 | * is_accepted: Indicates if the host has accepted guest's capabilities. | |
234 | * reservedz: Must be 0. | |
235 | */ | |
236 | ||
237 | struct dm_capabilities_resp_msg { | |
238 | struct dm_header hdr; | |
239 | __u64 is_accepted:1; | |
240 | __u64 reservedz:63; | |
241 | } __packed; | |
242 | ||
243 | /* | |
244 | * This message is used to report memory pressure from the guest. | |
245 | * This message is not part of any transaction and there is no | |
246 | * response to this message. | |
247 | * | |
248 | * num_avail: Available memory in pages. | |
249 | * num_committed: Committed memory in pages. | |
250 | * page_file_size: The accumulated size of all page files | |
251 | * in the system in pages. | |
d180e0a1 | 252 | * zero_free: The number of zero and free pages. |
9aa8b50b S |
253 | * page_file_writes: The writes to the page file in pages. |
254 | * io_diff: An indicator of file cache efficiency or page file activity, | |
255 | * calculated as File Cache Page Fault Count - Page Read Count. | |
256 | * This value is in pages. | |
257 | * | |
258 | * Some of these metrics are Windows specific and fortunately | |
259 | * the algorithm on the host side that computes the guest memory | |
260 | * pressure only uses num_committed value. | |
261 | */ | |
262 | ||
263 | struct dm_status { | |
264 | struct dm_header hdr; | |
265 | __u64 num_avail; | |
266 | __u64 num_committed; | |
267 | __u64 page_file_size; | |
268 | __u64 zero_free; | |
269 | __u32 page_file_writes; | |
270 | __u32 io_diff; | |
271 | } __packed; | |
272 | ||
273 | ||
274 | /* | |
275 | * Message to ask the guest to allocate memory - balloon up message. | |
276 | * This message is sent from the host to the guest. The guest may not be | |
277 | * able to allocate as much memory as requested. | |
278 | * | |
279 | * num_pages: number of pages to allocate. | |
280 | */ | |
281 | ||
282 | struct dm_balloon { | |
283 | struct dm_header hdr; | |
284 | __u32 num_pages; | |
285 | __u32 reservedz; | |
286 | } __packed; | |
287 | ||
288 | ||
289 | /* | |
290 | * Balloon response message; this message is sent from the guest | |
291 | * to the host in response to the balloon message. | |
292 | * | |
293 | * reservedz: Reserved; must be set to zero. | |
294 | * more_pages: If FALSE, this is the last message of the transaction. | |
295 | * if TRUE there will atleast one more message from the guest. | |
296 | * | |
297 | * range_count: The number of ranges in the range array. | |
298 | * | |
299 | * range_array: An array of page ranges returned to the host. | |
300 | * | |
301 | */ | |
302 | ||
303 | struct dm_balloon_response { | |
304 | struct dm_header hdr; | |
305 | __u32 reservedz; | |
306 | __u32 more_pages:1; | |
307 | __u32 range_count:31; | |
308 | union dm_mem_page_range range_array[]; | |
309 | } __packed; | |
310 | ||
311 | /* | |
312 | * Un-balloon message; this message is sent from the host | |
313 | * to the guest to give guest more memory. | |
314 | * | |
315 | * more_pages: If FALSE, this is the last message of the transaction. | |
316 | * if TRUE there will atleast one more message from the guest. | |
317 | * | |
318 | * reservedz: Reserved; must be set to zero. | |
319 | * | |
320 | * range_count: The number of ranges in the range array. | |
321 | * | |
322 | * range_array: An array of page ranges returned to the host. | |
323 | * | |
324 | */ | |
325 | ||
326 | struct dm_unballoon_request { | |
327 | struct dm_header hdr; | |
328 | __u32 more_pages:1; | |
329 | __u32 reservedz:31; | |
330 | __u32 range_count; | |
331 | union dm_mem_page_range range_array[]; | |
332 | } __packed; | |
333 | ||
334 | /* | |
335 | * Un-balloon response message; this message is sent from the guest | |
336 | * to the host in response to an unballoon request. | |
337 | * | |
338 | */ | |
339 | ||
340 | struct dm_unballoon_response { | |
341 | struct dm_header hdr; | |
342 | } __packed; | |
343 | ||
344 | ||
345 | /* | |
346 | * Hot add request message. Message sent from the host to the guest. | |
347 | * | |
348 | * mem_range: Memory range to hot add. | |
349 | * | |
9aa8b50b S |
350 | */ |
351 | ||
352 | struct dm_hot_add { | |
353 | struct dm_header hdr; | |
354 | union dm_mem_page_range range; | |
355 | } __packed; | |
356 | ||
357 | /* | |
358 | * Hot add response message. | |
359 | * This message is sent by the guest to report the status of a hot add request. | |
360 | * If page_count is less than the requested page count, then the host should | |
361 | * assume all further hot add requests will fail, since this indicates that | |
362 | * the guest has hit an upper physical memory barrier. | |
363 | * | |
364 | * Hot adds may also fail due to low resources; in this case, the guest must | |
365 | * not complete this message until the hot add can succeed, and the host must | |
366 | * not send a new hot add request until the response is sent. | |
367 | * If VSC fails to hot add memory DYNMEM_NUMBER_OF_UNSUCCESSFUL_HOTADD_ATTEMPTS | |
368 | * times it fails the request. | |
369 | * | |
370 | * | |
371 | * page_count: number of pages that were successfully hot added. | |
372 | * | |
373 | * result: result of the operation 1: success, 0: failure. | |
374 | * | |
375 | */ | |
376 | ||
377 | struct dm_hot_add_response { | |
378 | struct dm_header hdr; | |
379 | __u32 page_count; | |
380 | __u32 result; | |
381 | } __packed; | |
382 | ||
383 | /* | |
384 | * Types of information sent from host to the guest. | |
385 | */ | |
386 | ||
387 | enum dm_info_type { | |
388 | INFO_TYPE_MAX_PAGE_CNT = 0, | |
389 | MAX_INFO_TYPE | |
390 | }; | |
391 | ||
392 | ||
393 | /* | |
394 | * Header for the information message. | |
395 | */ | |
396 | ||
397 | struct dm_info_header { | |
398 | enum dm_info_type type; | |
399 | __u32 data_size; | |
400 | } __packed; | |
401 | ||
402 | /* | |
403 | * This message is sent from the host to the guest to pass | |
404 | * some relevant information (win8 addition). | |
405 | * | |
406 | * reserved: no used. | |
407 | * info_size: size of the information blob. | |
408 | * info: information blob. | |
409 | */ | |
410 | ||
411 | struct dm_info_msg { | |
6427a0d7 | 412 | struct dm_header hdr; |
9aa8b50b S |
413 | __u32 reserved; |
414 | __u32 info_size; | |
415 | __u8 info[]; | |
416 | }; | |
417 | ||
418 | /* | |
419 | * End protocol definitions. | |
420 | */ | |
421 | ||
1cac8cd4 S |
422 | /* |
423 | * State to manage hot adding memory into the guest. | |
424 | * The range start_pfn : end_pfn specifies the range | |
425 | * that the host has asked us to hot add. The range | |
426 | * start_pfn : ha_end_pfn specifies the range that we have | |
427 | * currently hot added. We hot add in multiples of 128M | |
428 | * chunks; it is possible that we may not be able to bring | |
429 | * online all the pages in the region. The range | |
7cf3b79e | 430 | * covered_start_pfn:covered_end_pfn defines the pages that can |
1cac8cd4 S |
431 | * be brough online. |
432 | */ | |
433 | ||
434 | struct hv_hotadd_state { | |
435 | struct list_head list; | |
436 | unsigned long start_pfn; | |
7cf3b79e | 437 | unsigned long covered_start_pfn; |
1cac8cd4 S |
438 | unsigned long covered_end_pfn; |
439 | unsigned long ha_end_pfn; | |
440 | unsigned long end_pfn; | |
cb7a5724 VK |
441 | /* |
442 | * A list of gaps. | |
443 | */ | |
444 | struct list_head gap_list; | |
445 | }; | |
446 | ||
447 | struct hv_hotadd_gap { | |
448 | struct list_head list; | |
449 | unsigned long start_pfn; | |
450 | unsigned long end_pfn; | |
1cac8cd4 S |
451 | }; |
452 | ||
6571b2da S |
453 | struct balloon_state { |
454 | __u32 num_pages; | |
455 | struct work_struct wrk; | |
456 | }; | |
457 | ||
c51af826 S |
458 | struct hot_add_wrk { |
459 | union dm_mem_page_range ha_page_range; | |
1cac8cd4 | 460 | union dm_mem_page_range ha_region_range; |
c51af826 S |
461 | struct work_struct wrk; |
462 | }; | |
463 | ||
25bd2b2f | 464 | static bool allow_hibernation; |
1cac8cd4 | 465 | static bool hot_add = true; |
9aa8b50b | 466 | static bool do_hot_add; |
e500d158 S |
467 | /* |
468 | * Delay reporting memory pressure by | |
469 | * the specified number of seconds. | |
470 | */ | |
1cac8cd4 | 471 | static uint pressure_report_delay = 45; |
dc60f2db SG |
472 | extern unsigned int page_reporting_order; |
473 | #define HV_MAX_FAILURES 2 | |
9aa8b50b | 474 | |
ae339336 S |
475 | /* |
476 | * The last time we posted a pressure report to host. | |
477 | */ | |
478 | static unsigned long last_post_time; | |
479 | ||
dc60f2db SG |
480 | static int hv_hypercall_multi_failure; |
481 | ||
9aa8b50b S |
482 | module_param(hot_add, bool, (S_IRUGO | S_IWUSR)); |
483 | MODULE_PARM_DESC(hot_add, "If set attempt memory hot_add"); | |
484 | ||
e500d158 S |
485 | module_param(pressure_report_delay, uint, (S_IRUGO | S_IWUSR)); |
486 | MODULE_PARM_DESC(pressure_report_delay, "Delay in secs in reporting pressure"); | |
9aa8b50b S |
487 | static atomic_t trans_id = ATOMIC_INIT(0); |
488 | ||
8a7eb2d4 | 489 | static int dm_ring_size = VMBUS_RING_SIZE(16 * 1024); |
9aa8b50b S |
490 | |
491 | /* | |
492 | * Driver specific state. | |
493 | */ | |
494 | ||
495 | enum hv_dm_state { | |
496 | DM_INITIALIZING = 0, | |
497 | DM_INITIALIZED, | |
498 | DM_BALLOON_UP, | |
499 | DM_BALLOON_DOWN, | |
500 | DM_HOT_ADD, | |
501 | DM_INIT_ERROR | |
502 | }; | |
503 | ||
504 | ||
2af5e7b7 HP |
505 | static __u8 recv_buffer[HV_HYP_PAGE_SIZE]; |
506 | static __u8 balloon_up_send_buffer[HV_HYP_PAGE_SIZE]; | |
507 | #define PAGES_IN_2M (2 * 1024 * 1024 / PAGE_SIZE) | |
508 | #define HA_CHUNK (128 * 1024 * 1024 / PAGE_SIZE) | |
9aa8b50b S |
509 | |
510 | struct hv_dynmem_device { | |
511 | struct hv_device *dev; | |
512 | enum hv_dm_state state; | |
513 | struct completion host_event; | |
514 | struct completion config_event; | |
515 | ||
516 | /* | |
517 | * Number of pages we have currently ballooned out. | |
518 | */ | |
519 | unsigned int num_pages_ballooned; | |
549fd280 VK |
520 | unsigned int num_pages_onlined; |
521 | unsigned int num_pages_added; | |
9aa8b50b S |
522 | |
523 | /* | |
6571b2da S |
524 | * State to manage the ballooning (up) operation. |
525 | */ | |
526 | struct balloon_state balloon_wrk; | |
527 | ||
c51af826 S |
528 | /* |
529 | * State to execute the "hot-add" operation. | |
530 | */ | |
531 | struct hot_add_wrk ha_wrk; | |
532 | ||
1cac8cd4 S |
533 | /* |
534 | * This state tracks if the host has specified a hot-add | |
535 | * region. | |
536 | */ | |
537 | bool host_specified_ha_region; | |
538 | ||
539 | /* | |
540 | * State to synchronize hot-add. | |
541 | */ | |
542 | struct completion ol_waitevent; | |
6571b2da S |
543 | /* |
544 | * This thread handles hot-add | |
9aa8b50b S |
545 | * requests from the host as well as notifying |
546 | * the host with regards to memory pressure in | |
547 | * the guest. | |
548 | */ | |
549 | struct task_struct *thread; | |
550 | ||
eece30b9 VK |
551 | /* |
552 | * Protects ha_region_list, num_pages_onlined counter and individual | |
553 | * regions from ha_region_list. | |
554 | */ | |
555 | spinlock_t ha_lock; | |
22f88475 | 556 | |
1cac8cd4 S |
557 | /* |
558 | * A list of hot-add regions. | |
559 | */ | |
560 | struct list_head ha_region_list; | |
561 | ||
9aa8b50b S |
562 | /* |
563 | * We start with the highest version we can support | |
564 | * and downgrade based on the host; we save here the | |
565 | * next version to try. | |
566 | */ | |
567 | __u32 next_version; | |
b3bb97b8 AN |
568 | |
569 | /* | |
570 | * The negotiated version agreed by host. | |
571 | */ | |
572 | __u32 version; | |
6dc2a774 SM |
573 | |
574 | struct page_reporting_dev_info pr_dev_info; | |
d180e0a1 AA |
575 | |
576 | /* | |
577 | * Maximum number of pages that can be hot_add-ed | |
578 | */ | |
579 | __u64 max_dynamic_page_count; | |
9aa8b50b S |
580 | }; |
581 | ||
582 | static struct hv_dynmem_device dm_device; | |
583 | ||
ae339336 | 584 | static void post_status(struct hv_dynmem_device *dm); |
22f88475 | 585 | |
dc60f2db SG |
586 | static void enable_page_reporting(void); |
587 | ||
588 | static void disable_page_reporting(void); | |
589 | ||
1cac8cd4 | 590 | #ifdef CONFIG_MEMORY_HOTPLUG |
bba072d1 VK |
591 | static inline bool has_pfn_is_backed(struct hv_hotadd_state *has, |
592 | unsigned long pfn) | |
593 | { | |
594 | struct hv_hotadd_gap *gap; | |
595 | ||
596 | /* The page is not backed. */ | |
597 | if ((pfn < has->covered_start_pfn) || (pfn >= has->covered_end_pfn)) | |
598 | return false; | |
599 | ||
600 | /* Check for gaps. */ | |
601 | list_for_each_entry(gap, &has->gap_list, list) { | |
602 | if ((pfn >= gap->start_pfn) && (pfn < gap->end_pfn)) | |
603 | return false; | |
604 | } | |
605 | ||
606 | return true; | |
607 | } | |
608 | ||
609 | static unsigned long hv_page_offline_check(unsigned long start_pfn, | |
610 | unsigned long nr_pages) | |
611 | { | |
612 | unsigned long pfn = start_pfn, count = 0; | |
613 | struct hv_hotadd_state *has; | |
614 | bool found; | |
615 | ||
616 | while (pfn < start_pfn + nr_pages) { | |
617 | /* | |
618 | * Search for HAS which covers the pfn and when we find one | |
619 | * count how many consequitive PFNs are covered. | |
620 | */ | |
621 | found = false; | |
622 | list_for_each_entry(has, &dm_device.ha_region_list, list) { | |
623 | while ((pfn >= has->start_pfn) && | |
624 | (pfn < has->end_pfn) && | |
625 | (pfn < start_pfn + nr_pages)) { | |
626 | found = true; | |
627 | if (has_pfn_is_backed(has, pfn)) | |
628 | count++; | |
629 | pfn++; | |
630 | } | |
631 | } | |
632 | ||
633 | /* | |
634 | * This PFN is not in any HAS (e.g. we're offlining a region | |
635 | * which was present at boot), no need to account for it. Go | |
636 | * to the next one. | |
637 | */ | |
638 | if (!found) | |
639 | pfn++; | |
640 | } | |
641 | ||
642 | return count; | |
643 | } | |
644 | ||
22f88475 S |
645 | static int hv_memory_notifier(struct notifier_block *nb, unsigned long val, |
646 | void *v) | |
647 | { | |
549fd280 | 648 | struct memory_notify *mem = (struct memory_notify *)v; |
bba072d1 | 649 | unsigned long flags, pfn_count; |
549fd280 | 650 | |
22f88475 | 651 | switch (val) { |
22f88475 S |
652 | case MEM_ONLINE: |
653 | case MEM_CANCEL_ONLINE: | |
bc58ebd5 | 654 | complete(&dm_device.ol_waitevent); |
22f88475 S |
655 | break; |
656 | ||
22f88475 | 657 | case MEM_OFFLINE: |
eece30b9 | 658 | spin_lock_irqsave(&dm_device.ha_lock, flags); |
bba072d1 VK |
659 | pfn_count = hv_page_offline_check(mem->start_pfn, |
660 | mem->nr_pages); | |
661 | if (pfn_count <= dm_device.num_pages_onlined) { | |
662 | dm_device.num_pages_onlined -= pfn_count; | |
663 | } else { | |
664 | /* | |
665 | * We're offlining more pages than we managed to online. | |
666 | * This is unexpected. In any case don't let | |
667 | * num_pages_onlined wrap around zero. | |
668 | */ | |
669 | WARN_ON_ONCE(1); | |
670 | dm_device.num_pages_onlined = 0; | |
671 | } | |
eece30b9 | 672 | spin_unlock_irqrestore(&dm_device.ha_lock, flags); |
549fd280 | 673 | break; |
eece30b9 | 674 | case MEM_GOING_ONLINE: |
549fd280 | 675 | case MEM_GOING_OFFLINE: |
22f88475 S |
676 | case MEM_CANCEL_OFFLINE: |
677 | break; | |
678 | } | |
679 | return NOTIFY_OK; | |
680 | } | |
681 | ||
682 | static struct notifier_block hv_memory_nb = { | |
683 | .notifier_call = hv_memory_notifier, | |
684 | .priority = 0 | |
685 | }; | |
686 | ||
cb7a5724 VK |
687 | /* Check if the particular page is backed and can be onlined and online it. */ |
688 | static void hv_page_online_one(struct hv_hotadd_state *has, struct page *pg) | |
689 | { | |
fae42c4d DH |
690 | if (!has_pfn_is_backed(has, page_to_pfn(pg))) { |
691 | if (!PageOffline(pg)) | |
692 | __SetPageOffline(pg); | |
cb7a5724 | 693 | return; |
fae42c4d DH |
694 | } |
695 | if (PageOffline(pg)) | |
696 | __ClearPageOffline(pg); | |
cb7a5724 | 697 | |
cb7a5724 | 698 | /* This frame is currently backed; online the page. */ |
30a9c246 | 699 | generic_online_page(pg, 0); |
6df8d9aa | 700 | |
1c87dc89 | 701 | lockdep_assert_held(&dm_device.ha_lock); |
6df8d9aa | 702 | dm_device.num_pages_onlined++; |
cb7a5724 VK |
703 | } |
704 | ||
705 | static void hv_bring_pgs_online(struct hv_hotadd_state *has, | |
706 | unsigned long start_pfn, unsigned long size) | |
9aa8b50b | 707 | { |
1cac8cd4 | 708 | int i; |
9aa8b50b | 709 | |
b3bb97b8 | 710 | pr_debug("Online %lu pages starting at pfn 0x%lx\n", size, start_pfn); |
cb7a5724 VK |
711 | for (i = 0; i < size; i++) |
712 | hv_page_online_one(has, pfn_to_page(start_pfn + i)); | |
1cac8cd4 S |
713 | } |
714 | ||
715 | static void hv_mem_hot_add(unsigned long start, unsigned long size, | |
716 | unsigned long pfn_count, | |
717 | struct hv_hotadd_state *has) | |
718 | { | |
719 | int ret = 0; | |
ed07ec93 | 720 | int i, nid; |
1cac8cd4 S |
721 | unsigned long start_pfn; |
722 | unsigned long processed_pfn; | |
723 | unsigned long total_pfn = pfn_count; | |
eece30b9 | 724 | unsigned long flags; |
1cac8cd4 S |
725 | |
726 | for (i = 0; i < (size/HA_CHUNK); i++) { | |
727 | start_pfn = start + (i * HA_CHUNK); | |
eece30b9 VK |
728 | |
729 | spin_lock_irqsave(&dm_device.ha_lock, flags); | |
1cac8cd4 S |
730 | has->ha_end_pfn += HA_CHUNK; |
731 | ||
732 | if (total_pfn > HA_CHUNK) { | |
733 | processed_pfn = HA_CHUNK; | |
734 | total_pfn -= HA_CHUNK; | |
735 | } else { | |
736 | processed_pfn = total_pfn; | |
737 | total_pfn = 0; | |
738 | } | |
739 | ||
740 | has->covered_end_pfn += processed_pfn; | |
eece30b9 | 741 | spin_unlock_irqrestore(&dm_device.ha_lock, flags); |
9aa8b50b | 742 | |
bc58ebd5 | 743 | reinit_completion(&dm_device.ol_waitevent); |
9aa8b50b | 744 | |
1cac8cd4 S |
745 | nid = memory_add_physaddr_to_nid(PFN_PHYS(start_pfn)); |
746 | ret = add_memory(nid, PFN_PHYS((start_pfn)), | |
26011267 | 747 | (HA_CHUNK << PAGE_SHIFT), MHP_MERGE_RESOURCE); |
1cac8cd4 S |
748 | |
749 | if (ret) { | |
223e1e4d | 750 | pr_err("hot_add memory failed error is %d\n", ret); |
7f4f2302 S |
751 | if (ret == -EEXIST) { |
752 | /* | |
753 | * This error indicates that the error | |
754 | * is not a transient failure. This is the | |
755 | * case where the guest's physical address map | |
756 | * precludes hot adding memory. Stop all further | |
757 | * memory hot-add. | |
758 | */ | |
759 | do_hot_add = false; | |
760 | } | |
eece30b9 | 761 | spin_lock_irqsave(&dm_device.ha_lock, flags); |
1cac8cd4 S |
762 | has->ha_end_pfn -= HA_CHUNK; |
763 | has->covered_end_pfn -= processed_pfn; | |
eece30b9 | 764 | spin_unlock_irqrestore(&dm_device.ha_lock, flags); |
1cac8cd4 S |
765 | break; |
766 | } | |
9aa8b50b S |
767 | |
768 | /* | |
bc58ebd5 DH |
769 | * Wait for memory to get onlined. If the kernel onlined the |
770 | * memory when adding it, this will return directly. Otherwise, | |
771 | * it will wait for user space to online the memory. This helps | |
772 | * to avoid adding memory faster than it is getting onlined. As | |
773 | * adding succeeded, it is ok to proceed even if the memory was | |
774 | * not onlined in time. | |
9aa8b50b | 775 | */ |
bc58ebd5 | 776 | wait_for_completion_timeout(&dm_device.ol_waitevent, 5 * HZ); |
ae339336 | 777 | post_status(&dm_device); |
9aa8b50b | 778 | } |
1cac8cd4 S |
779 | } |
780 | ||
a9cd410a | 781 | static void hv_online_page(struct page *pg, unsigned int order) |
1cac8cd4 | 782 | { |
1cac8cd4 | 783 | struct hv_hotadd_state *has; |
eece30b9 | 784 | unsigned long flags; |
4f098af5 | 785 | unsigned long pfn = page_to_pfn(pg); |
1cac8cd4 | 786 | |
eece30b9 VK |
787 | spin_lock_irqsave(&dm_device.ha_lock, flags); |
788 | list_for_each_entry(has, &dm_device.ha_region_list, list) { | |
cb7a5724 | 789 | /* The page belongs to a different HAS. */ |
a9cd410a AK |
790 | if ((pfn < has->start_pfn) || |
791 | (pfn + (1UL << order) > has->end_pfn)) | |
cb7a5724 VK |
792 | continue; |
793 | ||
a9cd410a | 794 | hv_bring_pgs_online(has, pfn, 1UL << order); |
cb7a5724 | 795 | break; |
1cac8cd4 | 796 | } |
eece30b9 | 797 | spin_unlock_irqrestore(&dm_device.ha_lock, flags); |
1cac8cd4 S |
798 | } |
799 | ||
cb7a5724 | 800 | static int pfn_covered(unsigned long start_pfn, unsigned long pfn_cnt) |
1cac8cd4 | 801 | { |
1cac8cd4 | 802 | struct hv_hotadd_state *has; |
cb7a5724 | 803 | struct hv_hotadd_gap *gap; |
1cac8cd4 | 804 | unsigned long residual, new_inc; |
eece30b9 VK |
805 | int ret = 0; |
806 | unsigned long flags; | |
1cac8cd4 | 807 | |
eece30b9 VK |
808 | spin_lock_irqsave(&dm_device.ha_lock, flags); |
809 | list_for_each_entry(has, &dm_device.ha_region_list, list) { | |
1cac8cd4 S |
810 | /* |
811 | * If the pfn range we are dealing with is not in the current | |
812 | * "hot add block", move on. | |
813 | */ | |
77c0c973 | 814 | if (start_pfn < has->start_pfn || start_pfn >= has->end_pfn) |
1cac8cd4 | 815 | continue; |
cb7a5724 VK |
816 | |
817 | /* | |
818 | * If the current start pfn is not where the covered_end | |
819 | * is, create a gap and update covered_end_pfn. | |
820 | */ | |
821 | if (has->covered_end_pfn != start_pfn) { | |
822 | gap = kzalloc(sizeof(struct hv_hotadd_gap), GFP_ATOMIC); | |
eece30b9 VK |
823 | if (!gap) { |
824 | ret = -ENOMEM; | |
825 | break; | |
826 | } | |
cb7a5724 VK |
827 | |
828 | INIT_LIST_HEAD(&gap->list); | |
829 | gap->start_pfn = has->covered_end_pfn; | |
830 | gap->end_pfn = start_pfn; | |
831 | list_add_tail(&gap->list, &has->gap_list); | |
832 | ||
833 | has->covered_end_pfn = start_pfn; | |
834 | } | |
835 | ||
1cac8cd4 S |
836 | /* |
837 | * If the current hot add-request extends beyond | |
838 | * our current limit; extend it. | |
839 | */ | |
840 | if ((start_pfn + pfn_cnt) > has->end_pfn) { | |
841 | residual = (start_pfn + pfn_cnt - has->end_pfn); | |
842 | /* | |
843 | * Extend the region by multiples of HA_CHUNK. | |
844 | */ | |
845 | new_inc = (residual / HA_CHUNK) * HA_CHUNK; | |
846 | if (residual % HA_CHUNK) | |
847 | new_inc += HA_CHUNK; | |
848 | ||
849 | has->end_pfn += new_inc; | |
850 | } | |
851 | ||
eece30b9 VK |
852 | ret = 1; |
853 | break; | |
1cac8cd4 | 854 | } |
eece30b9 | 855 | spin_unlock_irqrestore(&dm_device.ha_lock, flags); |
1cac8cd4 | 856 | |
eece30b9 | 857 | return ret; |
1cac8cd4 S |
858 | } |
859 | ||
860 | static unsigned long handle_pg_range(unsigned long pg_start, | |
861 | unsigned long pg_count) | |
862 | { | |
863 | unsigned long start_pfn = pg_start; | |
864 | unsigned long pfn_cnt = pg_count; | |
865 | unsigned long size; | |
1cac8cd4 S |
866 | struct hv_hotadd_state *has; |
867 | unsigned long pgs_ol = 0; | |
868 | unsigned long old_covered_state; | |
eece30b9 | 869 | unsigned long res = 0, flags; |
1cac8cd4 | 870 | |
b3bb97b8 AN |
871 | pr_debug("Hot adding %lu pages starting at pfn 0x%lx.\n", pg_count, |
872 | pg_start); | |
873 | ||
eece30b9 VK |
874 | spin_lock_irqsave(&dm_device.ha_lock, flags); |
875 | list_for_each_entry(has, &dm_device.ha_region_list, list) { | |
1cac8cd4 S |
876 | /* |
877 | * If the pfn range we are dealing with is not in the current | |
878 | * "hot add block", move on. | |
879 | */ | |
77c0c973 | 880 | if (start_pfn < has->start_pfn || start_pfn >= has->end_pfn) |
1cac8cd4 S |
881 | continue; |
882 | ||
883 | old_covered_state = has->covered_end_pfn; | |
884 | ||
885 | if (start_pfn < has->ha_end_pfn) { | |
886 | /* | |
887 | * This is the case where we are backing pages | |
888 | * in an already hot added region. Bring | |
889 | * these pages online first. | |
890 | */ | |
891 | pgs_ol = has->ha_end_pfn - start_pfn; | |
892 | if (pgs_ol > pfn_cnt) | |
893 | pgs_ol = pfn_cnt; | |
d6cbd2c3 | 894 | |
cb7a5724 VK |
895 | has->covered_end_pfn += pgs_ol; |
896 | pfn_cnt -= pgs_ol; | |
d6cbd2c3 VK |
897 | /* |
898 | * Check if the corresponding memory block is already | |
da8ced36 VK |
899 | * online. It is possible to observe struct pages still |
900 | * being uninitialized here so check section instead. | |
901 | * In case the section is online we need to bring the | |
902 | * rest of pfns (which were not backed previously) | |
903 | * online too. | |
d6cbd2c3 VK |
904 | */ |
905 | if (start_pfn > has->start_pfn && | |
da8ced36 | 906 | online_section_nr(pfn_to_section_nr(start_pfn))) |
cb7a5724 | 907 | hv_bring_pgs_online(has, start_pfn, pgs_ol); |
d6cbd2c3 | 908 | |
1cac8cd4 S |
909 | } |
910 | ||
911 | if ((has->ha_end_pfn < has->end_pfn) && (pfn_cnt > 0)) { | |
912 | /* | |
913 | * We have some residual hot add range | |
914 | * that needs to be hot added; hot add | |
915 | * it now. Hot add a multiple of | |
99632e3d | 916 | * HA_CHUNK that fully covers the pages |
1cac8cd4 S |
917 | * we have. |
918 | */ | |
919 | size = (has->end_pfn - has->ha_end_pfn); | |
920 | if (pfn_cnt <= size) { | |
921 | size = ((pfn_cnt / HA_CHUNK) * HA_CHUNK); | |
922 | if (pfn_cnt % HA_CHUNK) | |
923 | size += HA_CHUNK; | |
924 | } else { | |
925 | pfn_cnt = size; | |
926 | } | |
eece30b9 | 927 | spin_unlock_irqrestore(&dm_device.ha_lock, flags); |
1cac8cd4 | 928 | hv_mem_hot_add(has->ha_end_pfn, size, pfn_cnt, has); |
eece30b9 | 929 | spin_lock_irqsave(&dm_device.ha_lock, flags); |
1cac8cd4 S |
930 | } |
931 | /* | |
932 | * If we managed to online any pages that were given to us, | |
933 | * we declare success. | |
934 | */ | |
eece30b9 VK |
935 | res = has->covered_end_pfn - old_covered_state; |
936 | break; | |
1cac8cd4 | 937 | } |
eece30b9 | 938 | spin_unlock_irqrestore(&dm_device.ha_lock, flags); |
1cac8cd4 | 939 | |
eece30b9 | 940 | return res; |
1cac8cd4 S |
941 | } |
942 | ||
943 | static unsigned long process_hot_add(unsigned long pg_start, | |
944 | unsigned long pfn_cnt, | |
945 | unsigned long rg_start, | |
946 | unsigned long rg_size) | |
947 | { | |
948 | struct hv_hotadd_state *ha_region = NULL; | |
cb7a5724 | 949 | int covered; |
eece30b9 | 950 | unsigned long flags; |
1cac8cd4 S |
951 | |
952 | if (pfn_cnt == 0) | |
953 | return 0; | |
954 | ||
cb7a5724 VK |
955 | if (!dm_device.host_specified_ha_region) { |
956 | covered = pfn_covered(pg_start, pfn_cnt); | |
957 | if (covered < 0) | |
958 | return 0; | |
959 | ||
960 | if (covered) | |
1cac8cd4 | 961 | goto do_pg_range; |
cb7a5724 | 962 | } |
1cac8cd4 S |
963 | |
964 | /* | |
965 | * If the host has specified a hot-add range; deal with it first. | |
966 | */ | |
967 | ||
647965a2 | 968 | if (rg_size != 0) { |
1cac8cd4 S |
969 | ha_region = kzalloc(sizeof(struct hv_hotadd_state), GFP_KERNEL); |
970 | if (!ha_region) | |
971 | return 0; | |
972 | ||
973 | INIT_LIST_HEAD(&ha_region->list); | |
cb7a5724 | 974 | INIT_LIST_HEAD(&ha_region->gap_list); |
1cac8cd4 | 975 | |
1cac8cd4 S |
976 | ha_region->start_pfn = rg_start; |
977 | ha_region->ha_end_pfn = rg_start; | |
7cf3b79e | 978 | ha_region->covered_start_pfn = pg_start; |
1cac8cd4 S |
979 | ha_region->covered_end_pfn = pg_start; |
980 | ha_region->end_pfn = rg_start + rg_size; | |
eece30b9 VK |
981 | |
982 | spin_lock_irqsave(&dm_device.ha_lock, flags); | |
983 | list_add_tail(&ha_region->list, &dm_device.ha_region_list); | |
984 | spin_unlock_irqrestore(&dm_device.ha_lock, flags); | |
1cac8cd4 S |
985 | } |
986 | ||
987 | do_pg_range: | |
988 | /* | |
989 | * Process the page range specified; bringing them | |
990 | * online if possible. | |
991 | */ | |
992 | return handle_pg_range(pg_start, pfn_cnt); | |
993 | } | |
994 | ||
995 | #endif | |
996 | ||
997 | static void hot_add_req(struct work_struct *dummy) | |
998 | { | |
999 | struct dm_hot_add_response resp; | |
1000 | #ifdef CONFIG_MEMORY_HOTPLUG | |
1001 | unsigned long pg_start, pfn_cnt; | |
1002 | unsigned long rg_start, rg_sz; | |
1003 | #endif | |
1004 | struct hv_dynmem_device *dm = &dm_device; | |
1005 | ||
9aa8b50b S |
1006 | memset(&resp, 0, sizeof(struct dm_hot_add_response)); |
1007 | resp.hdr.type = DM_MEM_HOT_ADD_RESPONSE; | |
1008 | resp.hdr.size = sizeof(struct dm_hot_add_response); | |
9aa8b50b | 1009 | |
1cac8cd4 S |
1010 | #ifdef CONFIG_MEMORY_HOTPLUG |
1011 | pg_start = dm->ha_wrk.ha_page_range.finfo.start_page; | |
1012 | pfn_cnt = dm->ha_wrk.ha_page_range.finfo.page_cnt; | |
9aa8b50b | 1013 | |
1cac8cd4 S |
1014 | rg_start = dm->ha_wrk.ha_region_range.finfo.start_page; |
1015 | rg_sz = dm->ha_wrk.ha_region_range.finfo.page_cnt; | |
1016 | ||
1017 | if ((rg_start == 0) && (!dm->host_specified_ha_region)) { | |
1018 | unsigned long region_size; | |
1019 | unsigned long region_start; | |
1020 | ||
1021 | /* | |
1022 | * The host has not specified the hot-add region. | |
1023 | * Based on the hot-add page range being specified, | |
1024 | * compute a hot-add region that can cover the pages | |
1025 | * that need to be hot-added while ensuring the alignment | |
1026 | * and size requirements of Linux as it relates to hot-add. | |
1027 | */ | |
1cac8cd4 S |
1028 | region_size = (pfn_cnt / HA_CHUNK) * HA_CHUNK; |
1029 | if (pfn_cnt % HA_CHUNK) | |
1030 | region_size += HA_CHUNK; | |
1031 | ||
1032 | region_start = (pg_start / HA_CHUNK) * HA_CHUNK; | |
1033 | ||
1034 | rg_start = region_start; | |
1035 | rg_sz = region_size; | |
1036 | } | |
1037 | ||
7f4f2302 S |
1038 | if (do_hot_add) |
1039 | resp.page_count = process_hot_add(pg_start, pfn_cnt, | |
1040 | rg_start, rg_sz); | |
549fd280 VK |
1041 | |
1042 | dm->num_pages_added += resp.page_count; | |
1cac8cd4 | 1043 | #endif |
7f4f2302 S |
1044 | /* |
1045 | * The result field of the response structure has the | |
1046 | * following semantics: | |
1047 | * | |
1048 | * 1. If all or some pages hot-added: Guest should return success. | |
1049 | * | |
1050 | * 2. If no pages could be hot-added: | |
1051 | * | |
1052 | * If the guest returns success, then the host | |
1053 | * will not attempt any further hot-add operations. This | |
1054 | * signifies a permanent failure. | |
1055 | * | |
1056 | * If the guest returns failure, then this failure will be | |
1057 | * treated as a transient failure and the host may retry the | |
1058 | * hot-add operation after some delay. | |
1059 | */ | |
1cac8cd4 S |
1060 | if (resp.page_count > 0) |
1061 | resp.result = 1; | |
7f4f2302 S |
1062 | else if (!do_hot_add) |
1063 | resp.result = 1; | |
1cac8cd4 S |
1064 | else |
1065 | resp.result = 0; | |
1066 | ||
25bd2b2f DC |
1067 | if (!do_hot_add || resp.page_count == 0) { |
1068 | if (!allow_hibernation) | |
1069 | pr_err("Memory hot add failed\n"); | |
1070 | else | |
1071 | pr_info("Ignore hot-add request!\n"); | |
1072 | } | |
1cac8cd4 S |
1073 | |
1074 | dm->state = DM_INITIALIZED; | |
20138d6c | 1075 | resp.hdr.trans_id = atomic_inc_return(&trans_id); |
1cac8cd4 | 1076 | vmbus_sendpacket(dm->dev->channel, &resp, |
9aa8b50b S |
1077 | sizeof(struct dm_hot_add_response), |
1078 | (unsigned long)NULL, | |
1079 | VM_PKT_DATA_INBAND, 0); | |
9aa8b50b S |
1080 | } |
1081 | ||
1082 | static void process_info(struct hv_dynmem_device *dm, struct dm_info_msg *msg) | |
1083 | { | |
6427a0d7 S |
1084 | struct dm_info_header *info_hdr; |
1085 | ||
1086 | info_hdr = (struct dm_info_header *)msg->info; | |
1087 | ||
1088 | switch (info_hdr->type) { | |
9aa8b50b | 1089 | case INFO_TYPE_MAX_PAGE_CNT: |
85000960 AN |
1090 | if (info_hdr->data_size == sizeof(__u64)) { |
1091 | __u64 *max_page_count = (__u64 *)&info_hdr[1]; | |
1092 | ||
7b6e54b5 | 1093 | pr_info("Max. dynamic memory size: %llu MB\n", |
2af5e7b7 | 1094 | (*max_page_count) >> (20 - HV_HYP_PAGE_SHIFT)); |
d180e0a1 | 1095 | dm->max_dynamic_page_count = *max_page_count; |
85000960 AN |
1096 | } |
1097 | ||
9aa8b50b S |
1098 | break; |
1099 | default: | |
223e1e4d | 1100 | pr_warn("Received Unknown type: %d\n", info_hdr->type); |
9aa8b50b S |
1101 | } |
1102 | } | |
1103 | ||
a6025a2a | 1104 | static unsigned long compute_balloon_floor(void) |
1c7db96f S |
1105 | { |
1106 | unsigned long min_pages; | |
ca79b0c2 | 1107 | unsigned long nr_pages = totalram_pages(); |
1c7db96f S |
1108 | #define MB2PAGES(mb) ((mb) << (20 - PAGE_SHIFT)) |
1109 | /* Simple continuous piecewiese linear function: | |
1110 | * max MiB -> min MiB gradient | |
1111 | * 0 0 | |
1112 | * 16 16 | |
1113 | * 32 24 | |
1114 | * 128 72 (1/2) | |
1115 | * 512 168 (1/4) | |
1116 | * 2048 360 (1/8) | |
7fb0e1a6 VK |
1117 | * 8192 744 (1/16) |
1118 | * 32768 1512 (1/32) | |
1c7db96f | 1119 | */ |
3d6357de AK |
1120 | if (nr_pages < MB2PAGES(128)) |
1121 | min_pages = MB2PAGES(8) + (nr_pages >> 1); | |
1122 | else if (nr_pages < MB2PAGES(512)) | |
1123 | min_pages = MB2PAGES(40) + (nr_pages >> 2); | |
1124 | else if (nr_pages < MB2PAGES(2048)) | |
1125 | min_pages = MB2PAGES(104) + (nr_pages >> 3); | |
1126 | else if (nr_pages < MB2PAGES(8192)) | |
1127 | min_pages = MB2PAGES(232) + (nr_pages >> 4); | |
1c7db96f | 1128 | else |
3d6357de | 1129 | min_pages = MB2PAGES(488) + (nr_pages >> 5); |
1c7db96f S |
1130 | #undef MB2PAGES |
1131 | return min_pages; | |
1132 | } | |
1133 | ||
d180e0a1 AA |
1134 | /* |
1135 | * Compute total committed memory pages | |
1136 | */ | |
1137 | ||
1138 | static unsigned long get_pages_committed(struct hv_dynmem_device *dm) | |
1139 | { | |
1140 | return vm_memory_committed() + | |
1141 | dm->num_pages_ballooned + | |
1142 | (dm->num_pages_added > dm->num_pages_onlined ? | |
1143 | dm->num_pages_added - dm->num_pages_onlined : 0) + | |
1144 | compute_balloon_floor(); | |
1145 | } | |
1146 | ||
9aa8b50b S |
1147 | /* |
1148 | * Post our status as it relates memory pressure to the | |
1149 | * host. Host expects the guests to post this status | |
1150 | * periodically at 1 second intervals. | |
1151 | * | |
1152 | * The metrics specified in this protocol are very Windows | |
1153 | * specific and so we cook up numbers here to convey our memory | |
1154 | * pressure. | |
1155 | */ | |
1156 | ||
1157 | static void post_status(struct hv_dynmem_device *dm) | |
1158 | { | |
1159 | struct dm_status status; | |
ae339336 S |
1160 | unsigned long now = jiffies; |
1161 | unsigned long last_post = last_post_time; | |
b3d6dd09 | 1162 | unsigned long num_pages_avail, num_pages_committed; |
9aa8b50b | 1163 | |
e500d158 S |
1164 | if (pressure_report_delay > 0) { |
1165 | --pressure_report_delay; | |
1166 | return; | |
1167 | } | |
ae339336 S |
1168 | |
1169 | if (!time_after(now, (last_post_time + HZ))) | |
1170 | return; | |
1171 | ||
9aa8b50b S |
1172 | memset(&status, 0, sizeof(struct dm_status)); |
1173 | status.hdr.type = DM_STATUS_REPORT; | |
1174 | status.hdr.size = sizeof(struct dm_status); | |
1175 | status.hdr.trans_id = atomic_inc_return(&trans_id); | |
1176 | ||
0731572b | 1177 | /* |
549fd280 VK |
1178 | * The host expects the guest to report free and committed memory. |
1179 | * Furthermore, the host expects the pressure information to include | |
1180 | * the ballooned out pages. For a given amount of memory that we are | |
1181 | * managing we need to compute a floor below which we should not | |
1182 | * balloon. Compute this and add it to the pressure report. | |
1183 | * We also need to report all offline pages (num_pages_added - | |
1184 | * num_pages_onlined) as committed to the host, otherwise it can try | |
1185 | * asking us to balloon them out. | |
0731572b | 1186 | */ |
b3d6dd09 | 1187 | num_pages_avail = si_mem_available(); |
d180e0a1 | 1188 | num_pages_committed = get_pages_committed(dm); |
9aa8b50b | 1189 | |
b3d6dd09 | 1190 | trace_balloon_status(num_pages_avail, num_pages_committed, |
cf21be91 VK |
1191 | vm_memory_committed(), dm->num_pages_ballooned, |
1192 | dm->num_pages_added, dm->num_pages_onlined); | |
b3d6dd09 BF |
1193 | |
1194 | /* Convert numbers of pages into numbers of HV_HYP_PAGEs. */ | |
1195 | status.num_avail = num_pages_avail * NR_HV_HYP_PAGES_IN_PAGE; | |
1196 | status.num_committed = num_pages_committed * NR_HV_HYP_PAGES_IN_PAGE; | |
1197 | ||
c5e2254f S |
1198 | /* |
1199 | * If our transaction ID is no longer current, just don't | |
1200 | * send the status. This can happen if we were interrupted | |
1201 | * after we picked our transaction ID. | |
1202 | */ | |
1203 | if (status.hdr.trans_id != atomic_read(&trans_id)) | |
1204 | return; | |
1205 | ||
ae339336 S |
1206 | /* |
1207 | * If the last post time that we sampled has changed, | |
1208 | * we have raced, don't post the status. | |
1209 | */ | |
1210 | if (last_post != last_post_time) | |
1211 | return; | |
1212 | ||
1213 | last_post_time = jiffies; | |
9aa8b50b S |
1214 | vmbus_sendpacket(dm->dev->channel, &status, |
1215 | sizeof(struct dm_status), | |
1216 | (unsigned long)NULL, | |
1217 | VM_PKT_DATA_INBAND, 0); | |
1218 | ||
1219 | } | |
1220 | ||
989623c7 | 1221 | static void free_balloon_pages(struct hv_dynmem_device *dm, |
9aa8b50b S |
1222 | union dm_mem_page_range *range_array) |
1223 | { | |
1224 | int num_pages = range_array->finfo.page_cnt; | |
1225 | __u64 start_frame = range_array->finfo.start_page; | |
1226 | struct page *pg; | |
1227 | int i; | |
1228 | ||
1229 | for (i = 0; i < num_pages; i++) { | |
1230 | pg = pfn_to_page(i + start_frame); | |
fae42c4d | 1231 | __ClearPageOffline(pg); |
9aa8b50b S |
1232 | __free_page(pg); |
1233 | dm->num_pages_ballooned--; | |
d1df458c | 1234 | adjust_managed_page_count(pg, 1); |
9aa8b50b S |
1235 | } |
1236 | } | |
1237 | ||
1238 | ||
1239 | ||
797f88c9 VK |
1240 | static unsigned int alloc_balloon_pages(struct hv_dynmem_device *dm, |
1241 | unsigned int num_pages, | |
1242 | struct dm_balloon_response *bl_resp, | |
1243 | int alloc_unit) | |
9aa8b50b | 1244 | { |
fae42c4d | 1245 | unsigned int i, j; |
9aa8b50b S |
1246 | struct page *pg; |
1247 | ||
d33c240d | 1248 | for (i = 0; i < num_pages / alloc_unit; i++) { |
9aa8b50b | 1249 | if (bl_resp->hdr.size + sizeof(union dm_mem_page_range) > |
2af5e7b7 | 1250 | HV_HYP_PAGE_SIZE) |
9aa8b50b S |
1251 | return i * alloc_unit; |
1252 | ||
1253 | /* | |
1254 | * We execute this code in a thread context. Furthermore, | |
1255 | * we don't want the kernel to try too hard. | |
1256 | */ | |
1257 | pg = alloc_pages(GFP_HIGHUSER | __GFP_NORETRY | | |
1258 | __GFP_NOMEMALLOC | __GFP_NOWARN, | |
1259 | get_order(alloc_unit << PAGE_SHIFT)); | |
1260 | ||
0a1a86ac | 1261 | if (!pg) |
9aa8b50b | 1262 | return i * alloc_unit; |
9aa8b50b S |
1263 | |
1264 | dm->num_pages_ballooned += alloc_unit; | |
1265 | ||
f766dc1e S |
1266 | /* |
1267 | * If we allocatted 2M pages; split them so we | |
1268 | * can free them in any order we get. | |
1269 | */ | |
1270 | ||
1271 | if (alloc_unit != 1) | |
1272 | split_page(pg, get_order(alloc_unit << PAGE_SHIFT)); | |
1273 | ||
fae42c4d | 1274 | /* mark all pages offline */ |
d1df458c | 1275 | for (j = 0; j < alloc_unit; j++) { |
fae42c4d | 1276 | __SetPageOffline(pg + j); |
d1df458c VK |
1277 | adjust_managed_page_count(pg + j, -1); |
1278 | } | |
fae42c4d | 1279 | |
9aa8b50b S |
1280 | bl_resp->range_count++; |
1281 | bl_resp->range_array[i].finfo.start_page = | |
1282 | page_to_pfn(pg); | |
1283 | bl_resp->range_array[i].finfo.page_cnt = alloc_unit; | |
1284 | bl_resp->hdr.size += sizeof(union dm_mem_page_range); | |
1285 | ||
1286 | } | |
1287 | ||
d33c240d | 1288 | return i * alloc_unit; |
9aa8b50b S |
1289 | } |
1290 | ||
6571b2da | 1291 | static void balloon_up(struct work_struct *dummy) |
9aa8b50b | 1292 | { |
797f88c9 VK |
1293 | unsigned int num_pages = dm_device.balloon_wrk.num_pages; |
1294 | unsigned int num_ballooned = 0; | |
9aa8b50b S |
1295 | struct dm_balloon_response *bl_resp; |
1296 | int alloc_unit; | |
1297 | int ret; | |
9aa8b50b S |
1298 | bool done = false; |
1299 | int i; | |
b605c2d9 | 1300 | long avail_pages; |
530d15b9 | 1301 | unsigned long floor; |
9aa8b50b | 1302 | |
9aa8b50b | 1303 | /* |
f766dc1e | 1304 | * We will attempt 2M allocations. However, if we fail to |
2af5e7b7 | 1305 | * allocate 2M chunks, we will go back to PAGE_SIZE allocations. |
9aa8b50b | 1306 | */ |
2af5e7b7 | 1307 | alloc_unit = PAGES_IN_2M; |
9aa8b50b | 1308 | |
b605c2d9 | 1309 | avail_pages = si_mem_available(); |
530d15b9 VK |
1310 | floor = compute_balloon_floor(); |
1311 | ||
d33c240d | 1312 | /* Refuse to balloon below the floor. */ |
b605c2d9 | 1313 | if (avail_pages < num_pages || avail_pages - num_pages < floor) { |
2c3bd2a5 | 1314 | pr_info("Balloon request will be partially fulfilled. %s\n", |
b3bb97b8 AN |
1315 | avail_pages < num_pages ? "Not enough memory." : |
1316 | "Balloon floor reached."); | |
1317 | ||
b605c2d9 | 1318 | num_pages = avail_pages > floor ? (avail_pages - floor) : 0; |
530d15b9 VK |
1319 | } |
1320 | ||
9aa8b50b | 1321 | while (!done) { |
2af5e7b7 | 1322 | memset(balloon_up_send_buffer, 0, HV_HYP_PAGE_SIZE); |
1fed17df | 1323 | bl_resp = (struct dm_balloon_response *)balloon_up_send_buffer; |
9aa8b50b | 1324 | bl_resp->hdr.type = DM_BALLOON_RESPONSE; |
9aa8b50b S |
1325 | bl_resp->hdr.size = sizeof(struct dm_balloon_response); |
1326 | bl_resp->more_pages = 1; | |
1327 | ||
9aa8b50b | 1328 | num_pages -= num_ballooned; |
6571b2da | 1329 | num_ballooned = alloc_balloon_pages(&dm_device, num_pages, |
0a1a86ac | 1330 | bl_resp, alloc_unit); |
9aa8b50b | 1331 | |
f6712238 | 1332 | if (alloc_unit != 1 && num_ballooned == 0) { |
f766dc1e S |
1333 | alloc_unit = 1; |
1334 | continue; | |
1335 | } | |
1336 | ||
0a1a86ac | 1337 | if (num_ballooned == 0 || num_ballooned == num_pages) { |
b3bb97b8 AN |
1338 | pr_debug("Ballooned %u out of %u requested pages.\n", |
1339 | num_pages, dm_device.balloon_wrk.num_pages); | |
1340 | ||
9aa8b50b S |
1341 | bl_resp->more_pages = 0; |
1342 | done = true; | |
6571b2da | 1343 | dm_device.state = DM_INITIALIZED; |
9aa8b50b S |
1344 | } |
1345 | ||
1346 | /* | |
1347 | * We are pushing a lot of data through the channel; | |
1348 | * deal with transient failures caused because of the | |
1349 | * lack of space in the ring buffer. | |
1350 | */ | |
1351 | ||
1352 | do { | |
20138d6c | 1353 | bl_resp->hdr.trans_id = atomic_inc_return(&trans_id); |
9aa8b50b S |
1354 | ret = vmbus_sendpacket(dm_device.dev->channel, |
1355 | bl_resp, | |
1356 | bl_resp->hdr.size, | |
1357 | (unsigned long)NULL, | |
1358 | VM_PKT_DATA_INBAND, 0); | |
1359 | ||
1360 | if (ret == -EAGAIN) | |
1361 | msleep(20); | |
ae339336 | 1362 | post_status(&dm_device); |
9aa8b50b S |
1363 | } while (ret == -EAGAIN); |
1364 | ||
1365 | if (ret) { | |
1366 | /* | |
1367 | * Free up the memory we allocatted. | |
1368 | */ | |
223e1e4d | 1369 | pr_err("Balloon response failed\n"); |
9aa8b50b S |
1370 | |
1371 | for (i = 0; i < bl_resp->range_count; i++) | |
6571b2da | 1372 | free_balloon_pages(&dm_device, |
9aa8b50b S |
1373 | &bl_resp->range_array[i]); |
1374 | ||
1375 | done = true; | |
1376 | } | |
1377 | } | |
1378 | ||
1379 | } | |
1380 | ||
1381 | static void balloon_down(struct hv_dynmem_device *dm, | |
1382 | struct dm_unballoon_request *req) | |
1383 | { | |
1384 | union dm_mem_page_range *range_array = req->range_array; | |
1385 | int range_count = req->range_count; | |
1386 | struct dm_unballoon_response resp; | |
1387 | int i; | |
b3bb97b8 | 1388 | unsigned int prev_pages_ballooned = dm->num_pages_ballooned; |
9aa8b50b | 1389 | |
ae339336 | 1390 | for (i = 0; i < range_count; i++) { |
9aa8b50b | 1391 | free_balloon_pages(dm, &range_array[i]); |
ab3de22b | 1392 | complete(&dm_device.config_event); |
ae339336 | 1393 | } |
9aa8b50b | 1394 | |
b3bb97b8 AN |
1395 | pr_debug("Freed %u ballooned pages.\n", |
1396 | prev_pages_ballooned - dm->num_pages_ballooned); | |
1397 | ||
9aa8b50b S |
1398 | if (req->more_pages == 1) |
1399 | return; | |
1400 | ||
1401 | memset(&resp, 0, sizeof(struct dm_unballoon_response)); | |
1402 | resp.hdr.type = DM_UNBALLOON_RESPONSE; | |
1403 | resp.hdr.trans_id = atomic_inc_return(&trans_id); | |
1404 | resp.hdr.size = sizeof(struct dm_unballoon_response); | |
1405 | ||
1406 | vmbus_sendpacket(dm_device.dev->channel, &resp, | |
1407 | sizeof(struct dm_unballoon_response), | |
1408 | (unsigned long)NULL, | |
1409 | VM_PKT_DATA_INBAND, 0); | |
1410 | ||
1411 | dm->state = DM_INITIALIZED; | |
1412 | } | |
1413 | ||
1414 | static void balloon_onchannelcallback(void *context); | |
1415 | ||
1416 | static int dm_thread_func(void *dm_dev) | |
1417 | { | |
1418 | struct hv_dynmem_device *dm = dm_dev; | |
9aa8b50b S |
1419 | |
1420 | while (!kthread_should_stop()) { | |
ab3de22b | 1421 | wait_for_completion_interruptible_timeout( |
5dba4c56 | 1422 | &dm_device.config_event, 1*HZ); |
9aa8b50b S |
1423 | /* |
1424 | * The host expects us to post information on the memory | |
1425 | * pressure every second. | |
1426 | */ | |
ab3de22b S |
1427 | reinit_completion(&dm_device.config_event); |
1428 | post_status(dm); | |
dc60f2db SG |
1429 | /* |
1430 | * disable free page reporting if multiple hypercall | |
1431 | * failure flag set. It is not done in the page_reporting | |
1432 | * callback context as that causes a deadlock between | |
1433 | * page_reporting_process() and page_reporting_unregister() | |
1434 | */ | |
1435 | if (hv_hypercall_multi_failure >= HV_MAX_FAILURES) { | |
1436 | pr_err("Multiple failures in cold memory discard hypercall, disabling page reporting\n"); | |
1437 | disable_page_reporting(); | |
1438 | /* Reset the flag after disabling reporting */ | |
1439 | hv_hypercall_multi_failure = 0; | |
1440 | } | |
9aa8b50b S |
1441 | } |
1442 | ||
1443 | return 0; | |
1444 | } | |
1445 | ||
1446 | ||
1447 | static void version_resp(struct hv_dynmem_device *dm, | |
1448 | struct dm_version_response *vresp) | |
1449 | { | |
1450 | struct dm_version_request version_req; | |
1451 | int ret; | |
1452 | ||
1453 | if (vresp->is_accepted) { | |
1454 | /* | |
1455 | * We are done; wakeup the | |
1456 | * context waiting for version | |
1457 | * negotiation. | |
1458 | */ | |
1459 | complete(&dm->host_event); | |
1460 | return; | |
1461 | } | |
1462 | /* | |
1463 | * If there are more versions to try, continue | |
1464 | * with negotiations; if not | |
1465 | * shutdown the service since we are not able | |
1466 | * to negotiate a suitable version number | |
1467 | * with the host. | |
1468 | */ | |
1469 | if (dm->next_version == 0) | |
1470 | goto version_error; | |
1471 | ||
9aa8b50b S |
1472 | memset(&version_req, 0, sizeof(struct dm_version_request)); |
1473 | version_req.hdr.type = DM_VERSION_REQUEST; | |
1474 | version_req.hdr.size = sizeof(struct dm_version_request); | |
1475 | version_req.hdr.trans_id = atomic_inc_return(&trans_id); | |
b6ddeae1 | 1476 | version_req.version.version = dm->next_version; |
b3bb97b8 | 1477 | dm->version = version_req.version.version; |
b6ddeae1 AN |
1478 | |
1479 | /* | |
1480 | * Set the next version to try in case current version fails. | |
1481 | * Win7 protocol ought to be the last one to try. | |
1482 | */ | |
1483 | switch (version_req.version.version) { | |
1484 | case DYNMEM_PROTOCOL_VERSION_WIN8: | |
1485 | dm->next_version = DYNMEM_PROTOCOL_VERSION_WIN7; | |
1486 | version_req.is_last_attempt = 0; | |
1487 | break; | |
1488 | default: | |
1489 | dm->next_version = 0; | |
1490 | version_req.is_last_attempt = 1; | |
1491 | } | |
9aa8b50b S |
1492 | |
1493 | ret = vmbus_sendpacket(dm->dev->channel, &version_req, | |
1494 | sizeof(struct dm_version_request), | |
1495 | (unsigned long)NULL, | |
1496 | VM_PKT_DATA_INBAND, 0); | |
1497 | ||
1498 | if (ret) | |
1499 | goto version_error; | |
1500 | ||
1501 | return; | |
1502 | ||
1503 | version_error: | |
1504 | dm->state = DM_INIT_ERROR; | |
1505 | complete(&dm->host_event); | |
1506 | } | |
1507 | ||
1508 | static void cap_resp(struct hv_dynmem_device *dm, | |
1509 | struct dm_capabilities_resp_msg *cap_resp) | |
1510 | { | |
1511 | if (!cap_resp->is_accepted) { | |
223e1e4d | 1512 | pr_err("Capabilities not accepted by host\n"); |
9aa8b50b S |
1513 | dm->state = DM_INIT_ERROR; |
1514 | } | |
1515 | complete(&dm->host_event); | |
1516 | } | |
1517 | ||
1518 | static void balloon_onchannelcallback(void *context) | |
1519 | { | |
1520 | struct hv_device *dev = context; | |
1521 | u32 recvlen; | |
1522 | u64 requestid; | |
1523 | struct dm_message *dm_msg; | |
1524 | struct dm_header *dm_hdr; | |
1525 | struct hv_dynmem_device *dm = hv_get_drvdata(dev); | |
6571b2da | 1526 | struct dm_balloon *bal_msg; |
c51af826 S |
1527 | struct dm_hot_add *ha_msg; |
1528 | union dm_mem_page_range *ha_pg_range; | |
1cac8cd4 | 1529 | union dm_mem_page_range *ha_region; |
9aa8b50b S |
1530 | |
1531 | memset(recv_buffer, 0, sizeof(recv_buffer)); | |
1532 | vmbus_recvpacket(dev->channel, recv_buffer, | |
2af5e7b7 | 1533 | HV_HYP_PAGE_SIZE, &recvlen, &requestid); |
9aa8b50b S |
1534 | |
1535 | if (recvlen > 0) { | |
1536 | dm_msg = (struct dm_message *)recv_buffer; | |
1537 | dm_hdr = &dm_msg->hdr; | |
1538 | ||
1539 | switch (dm_hdr->type) { | |
1540 | case DM_VERSION_RESPONSE: | |
1541 | version_resp(dm, | |
1542 | (struct dm_version_response *)dm_msg); | |
1543 | break; | |
1544 | ||
1545 | case DM_CAPABILITIES_RESPONSE: | |
1546 | cap_resp(dm, | |
1547 | (struct dm_capabilities_resp_msg *)dm_msg); | |
1548 | break; | |
1549 | ||
1550 | case DM_BALLOON_REQUEST: | |
25bd2b2f DC |
1551 | if (allow_hibernation) { |
1552 | pr_info("Ignore balloon-up request!\n"); | |
1553 | break; | |
1554 | } | |
1555 | ||
6571b2da S |
1556 | if (dm->state == DM_BALLOON_UP) |
1557 | pr_warn("Currently ballooning\n"); | |
1558 | bal_msg = (struct dm_balloon *)recv_buffer; | |
9aa8b50b | 1559 | dm->state = DM_BALLOON_UP; |
6571b2da S |
1560 | dm_device.balloon_wrk.num_pages = bal_msg->num_pages; |
1561 | schedule_work(&dm_device.balloon_wrk.wrk); | |
9aa8b50b S |
1562 | break; |
1563 | ||
1564 | case DM_UNBALLOON_REQUEST: | |
25bd2b2f DC |
1565 | if (allow_hibernation) { |
1566 | pr_info("Ignore balloon-down request!\n"); | |
1567 | break; | |
1568 | } | |
1569 | ||
9aa8b50b S |
1570 | dm->state = DM_BALLOON_DOWN; |
1571 | balloon_down(dm, | |
1572 | (struct dm_unballoon_request *)recv_buffer); | |
1573 | break; | |
1574 | ||
1575 | case DM_MEM_HOT_ADD_REQUEST: | |
c51af826 S |
1576 | if (dm->state == DM_HOT_ADD) |
1577 | pr_warn("Currently hot-adding\n"); | |
9aa8b50b | 1578 | dm->state = DM_HOT_ADD; |
c51af826 | 1579 | ha_msg = (struct dm_hot_add *)recv_buffer; |
1cac8cd4 S |
1580 | if (ha_msg->hdr.size == sizeof(struct dm_hot_add)) { |
1581 | /* | |
1582 | * This is a normal hot-add request specifying | |
1583 | * hot-add memory. | |
1584 | */ | |
d19a55d6 | 1585 | dm->host_specified_ha_region = false; |
1cac8cd4 S |
1586 | ha_pg_range = &ha_msg->range; |
1587 | dm->ha_wrk.ha_page_range = *ha_pg_range; | |
1588 | dm->ha_wrk.ha_region_range.page_range = 0; | |
1589 | } else { | |
1590 | /* | |
1591 | * Host is specifying that we first hot-add | |
1592 | * a region and then partially populate this | |
1593 | * region. | |
1594 | */ | |
1595 | dm->host_specified_ha_region = true; | |
1596 | ha_pg_range = &ha_msg->range; | |
1597 | ha_region = &ha_pg_range[1]; | |
1598 | dm->ha_wrk.ha_page_range = *ha_pg_range; | |
1599 | dm->ha_wrk.ha_region_range = *ha_region; | |
1600 | } | |
c51af826 | 1601 | schedule_work(&dm_device.ha_wrk.wrk); |
9aa8b50b S |
1602 | break; |
1603 | ||
1604 | case DM_INFO_MESSAGE: | |
1605 | process_info(dm, (struct dm_info_msg *)dm_msg); | |
1606 | break; | |
1607 | ||
1608 | default: | |
1d728672 | 1609 | pr_warn_ratelimited("Unhandled message: type: %d\n", dm_hdr->type); |
9aa8b50b S |
1610 | |
1611 | } | |
1612 | } | |
1613 | ||
1614 | } | |
1615 | ||
dc60f2db SG |
1616 | #define HV_LARGE_REPORTING_ORDER 9 |
1617 | #define HV_LARGE_REPORTING_LEN (HV_HYP_PAGE_SIZE << \ | |
1618 | HV_LARGE_REPORTING_ORDER) | |
6dc2a774 SM |
1619 | static int hv_free_page_report(struct page_reporting_dev_info *pr_dev_info, |
1620 | struct scatterlist *sgl, unsigned int nents) | |
1621 | { | |
1622 | unsigned long flags; | |
1623 | struct hv_memory_hint *hint; | |
dc60f2db | 1624 | int i, order; |
6dc2a774 SM |
1625 | u64 status; |
1626 | struct scatterlist *sg; | |
1627 | ||
1628 | WARN_ON_ONCE(nents > HV_MEMORY_HINT_MAX_GPA_PAGE_RANGES); | |
dc60f2db | 1629 | WARN_ON_ONCE(sgl->length < (HV_HYP_PAGE_SIZE << page_reporting_order)); |
6dc2a774 | 1630 | local_irq_save(flags); |
55e544e1 | 1631 | hint = *this_cpu_ptr(hyperv_pcpu_input_arg); |
6dc2a774 SM |
1632 | if (!hint) { |
1633 | local_irq_restore(flags); | |
1634 | return -ENOSPC; | |
1635 | } | |
1636 | ||
1637 | hint->type = HV_EXT_MEMORY_HEAT_HINT_TYPE_COLD_DISCARD; | |
1638 | hint->reserved = 0; | |
1639 | for_each_sg(sgl, sg, nents, i) { | |
1640 | union hv_gpa_page_range *range; | |
1641 | ||
1642 | range = &hint->ranges[i]; | |
1643 | range->address_space = 0; | |
dc60f2db SG |
1644 | order = get_order(sg->length); |
1645 | /* | |
1646 | * Hyper-V expects the additional_pages field in the units | |
1647 | * of one of these 3 sizes, 4Kbytes, 2Mbytes or 1Gbytes. | |
1648 | * This is dictated by the values of the fields page.largesize | |
1649 | * and page_size. | |
1650 | * This code however, only uses 4Kbytes and 2Mbytes units | |
1651 | * and not 1Gbytes unit. | |
1652 | */ | |
1653 | ||
1654 | /* page reporting for pages 2MB or higher */ | |
1655 | if (order >= HV_LARGE_REPORTING_ORDER ) { | |
1656 | range->page.largepage = 1; | |
1657 | range->page_size = HV_GPA_PAGE_RANGE_PAGE_SIZE_2MB; | |
1658 | range->base_large_pfn = page_to_hvpfn( | |
1659 | sg_page(sg)) >> HV_LARGE_REPORTING_ORDER; | |
1660 | range->page.additional_pages = | |
1661 | (sg->length / HV_LARGE_REPORTING_LEN) - 1; | |
1662 | } else { | |
1663 | /* Page reporting for pages below 2MB */ | |
1664 | range->page.basepfn = page_to_hvpfn(sg_page(sg)); | |
1665 | range->page.largepage = false; | |
1666 | range->page.additional_pages = | |
1667 | (sg->length / HV_HYP_PAGE_SIZE) - 1; | |
1668 | } | |
1669 | ||
6dc2a774 SM |
1670 | } |
1671 | ||
1672 | status = hv_do_rep_hypercall(HV_EXT_CALL_MEMORY_HEAT_HINT, nents, 0, | |
1673 | hint, NULL); | |
1674 | local_irq_restore(flags); | |
dc60f2db SG |
1675 | if (!hv_result_success(status)) { |
1676 | ||
6dc2a774 | 1677 | pr_err("Cold memory discard hypercall failed with status %llx\n", |
dc60f2db SG |
1678 | status); |
1679 | if (hv_hypercall_multi_failure > 0) | |
1680 | hv_hypercall_multi_failure++; | |
1681 | ||
1682 | if (hv_result(status) == HV_STATUS_INVALID_PARAMETER) { | |
1683 | pr_err("Underlying Hyper-V does not support order less than 9. Hypercall failed\n"); | |
1684 | pr_err("Defaulting to page_reporting_order %d\n", | |
1685 | pageblock_order); | |
1686 | page_reporting_order = pageblock_order; | |
1687 | hv_hypercall_multi_failure++; | |
1688 | return -EINVAL; | |
1689 | } | |
1690 | ||
6dc2a774 SM |
1691 | return -EINVAL; |
1692 | } | |
1693 | ||
1694 | return 0; | |
1695 | } | |
1696 | ||
1697 | static void enable_page_reporting(void) | |
1698 | { | |
1699 | int ret; | |
1700 | ||
6dc2a774 SM |
1701 | if (!hv_query_ext_cap(HV_EXT_CAPABILITY_MEMORY_COLD_DISCARD_HINT)) { |
1702 | pr_debug("Cold memory discard hint not supported by Hyper-V\n"); | |
1703 | return; | |
1704 | } | |
1705 | ||
1706 | BUILD_BUG_ON(PAGE_REPORTING_CAPACITY > HV_MEMORY_HINT_MAX_GPA_PAGE_RANGES); | |
1707 | dm_device.pr_dev_info.report = hv_free_page_report; | |
dc60f2db SG |
1708 | /* |
1709 | * We let the page_reporting_order parameter decide the order | |
1710 | * in the page_reporting code | |
1711 | */ | |
1712 | dm_device.pr_dev_info.order = 0; | |
6dc2a774 SM |
1713 | ret = page_reporting_register(&dm_device.pr_dev_info); |
1714 | if (ret < 0) { | |
1715 | dm_device.pr_dev_info.report = NULL; | |
1716 | pr_err("Failed to enable cold memory discard: %d\n", ret); | |
1717 | } else { | |
dc60f2db SG |
1718 | pr_info("Cold memory discard hint enabled with order %d\n", |
1719 | page_reporting_order); | |
6dc2a774 SM |
1720 | } |
1721 | } | |
1722 | ||
1723 | static void disable_page_reporting(void) | |
1724 | { | |
1725 | if (dm_device.pr_dev_info.report) { | |
1726 | page_reporting_unregister(&dm_device.pr_dev_info); | |
1727 | dm_device.pr_dev_info.report = NULL; | |
1728 | } | |
1729 | } | |
1730 | ||
be580279 BF |
1731 | static int ballooning_enabled(void) |
1732 | { | |
1733 | /* | |
1734 | * Disable ballooning if the page size is not 4k (HV_HYP_PAGE_SIZE), | |
1735 | * since currently it's unclear to us whether an unballoon request can | |
1736 | * make sure all page ranges are guest page size aligned. | |
1737 | */ | |
1738 | if (PAGE_SIZE != HV_HYP_PAGE_SIZE) { | |
1739 | pr_info("Ballooning disabled because page size is not 4096 bytes\n"); | |
1740 | return 0; | |
1741 | } | |
1742 | ||
1743 | return 1; | |
1744 | } | |
1745 | ||
1746 | static int hot_add_enabled(void) | |
1747 | { | |
1748 | /* | |
1749 | * Disable hot add on ARM64, because we currently rely on | |
1750 | * memory_add_physaddr_to_nid() to get a node id of a hot add range, | |
1751 | * however ARM64's memory_add_physaddr_to_nid() always return 0 and | |
1752 | * DM_MEM_HOT_ADD_REQUEST doesn't have the NUMA node information for | |
1753 | * add_memory(). | |
1754 | */ | |
1755 | if (IS_ENABLED(CONFIG_ARM64)) { | |
1756 | pr_info("Memory hot add disabled on ARM64\n"); | |
1757 | return 0; | |
1758 | } | |
1759 | ||
1760 | return 1; | |
1761 | } | |
1762 | ||
221f6df0 | 1763 | static int balloon_connect_vsp(struct hv_device *dev) |
9aa8b50b | 1764 | { |
9aa8b50b S |
1765 | struct dm_version_request version_req; |
1766 | struct dm_capabilities cap_msg; | |
221f6df0 DC |
1767 | unsigned long t; |
1768 | int ret; | |
9aa8b50b | 1769 | |
96d9d1fa YL |
1770 | /* |
1771 | * max_pkt_size should be large enough for one vmbus packet header plus | |
1772 | * our receive buffer size. Hyper-V sends messages up to | |
1773 | * HV_HYP_PAGE_SIZE bytes long on balloon channel. | |
1774 | */ | |
1775 | dev->channel->max_pkt_size = HV_HYP_PAGE_SIZE * 2; | |
1776 | ||
9aa8b50b | 1777 | ret = vmbus_open(dev->channel, dm_ring_size, dm_ring_size, NULL, 0, |
221f6df0 | 1778 | balloon_onchannelcallback, dev); |
9aa8b50b | 1779 | if (ret) |
1fed17df | 1780 | return ret; |
9aa8b50b | 1781 | |
9aa8b50b S |
1782 | /* |
1783 | * Initiate the hand shake with the host and negotiate | |
1784 | * a version that the host can support. We start with the | |
1785 | * highest version number and go down if the host cannot | |
1786 | * support it. | |
1787 | */ | |
1788 | memset(&version_req, 0, sizeof(struct dm_version_request)); | |
1789 | version_req.hdr.type = DM_VERSION_REQUEST; | |
1790 | version_req.hdr.size = sizeof(struct dm_version_request); | |
1791 | version_req.hdr.trans_id = atomic_inc_return(&trans_id); | |
b6ddeae1 | 1792 | version_req.version.version = DYNMEM_PROTOCOL_VERSION_WIN10; |
9aa8b50b | 1793 | version_req.is_last_attempt = 0; |
b3bb97b8 | 1794 | dm_device.version = version_req.version.version; |
9aa8b50b S |
1795 | |
1796 | ret = vmbus_sendpacket(dev->channel, &version_req, | |
221f6df0 DC |
1797 | sizeof(struct dm_version_request), |
1798 | (unsigned long)NULL, VM_PKT_DATA_INBAND, 0); | |
9aa8b50b | 1799 | if (ret) |
221f6df0 | 1800 | goto out; |
9aa8b50b S |
1801 | |
1802 | t = wait_for_completion_timeout(&dm_device.host_event, 5*HZ); | |
1803 | if (t == 0) { | |
1804 | ret = -ETIMEDOUT; | |
221f6df0 | 1805 | goto out; |
9aa8b50b S |
1806 | } |
1807 | ||
1808 | /* | |
1809 | * If we could not negotiate a compatible version with the host | |
1810 | * fail the probe function. | |
1811 | */ | |
1812 | if (dm_device.state == DM_INIT_ERROR) { | |
221f6df0 DC |
1813 | ret = -EPROTO; |
1814 | goto out; | |
9aa8b50b | 1815 | } |
b3bb97b8 AN |
1816 | |
1817 | pr_info("Using Dynamic Memory protocol version %u.%u\n", | |
1818 | DYNMEM_MAJOR_VERSION(dm_device.version), | |
1819 | DYNMEM_MINOR_VERSION(dm_device.version)); | |
1820 | ||
9aa8b50b S |
1821 | /* |
1822 | * Now submit our capabilities to the host. | |
1823 | */ | |
1824 | memset(&cap_msg, 0, sizeof(struct dm_capabilities)); | |
1825 | cap_msg.hdr.type = DM_CAPABILITIES_REPORT; | |
1826 | cap_msg.hdr.size = sizeof(struct dm_capabilities); | |
1827 | cap_msg.hdr.trans_id = atomic_inc_return(&trans_id); | |
1828 | ||
25bd2b2f DC |
1829 | /* |
1830 | * When hibernation (i.e. virtual ACPI S4 state) is enabled, the host | |
1831 | * currently still requires the bits to be set, so we have to add code | |
1832 | * to fail the host's hot-add and balloon up/down requests, if any. | |
1833 | */ | |
be580279 BF |
1834 | cap_msg.caps.cap_bits.balloon = ballooning_enabled(); |
1835 | cap_msg.caps.cap_bits.hot_add = hot_add_enabled(); | |
9aa8b50b | 1836 | |
647965a2 S |
1837 | /* |
1838 | * Specify our alignment requirements as it relates | |
1839 | * memory hot-add. Specify 128MB alignment. | |
1840 | */ | |
1841 | cap_msg.caps.cap_bits.hot_add_alignment = 7; | |
1842 | ||
9aa8b50b S |
1843 | /* |
1844 | * Currently the host does not use these | |
1845 | * values and we set them to what is done in the | |
1846 | * Windows driver. | |
1847 | */ | |
1848 | cap_msg.min_page_cnt = 0; | |
1849 | cap_msg.max_page_number = -1; | |
1850 | ||
1851 | ret = vmbus_sendpacket(dev->channel, &cap_msg, | |
221f6df0 DC |
1852 | sizeof(struct dm_capabilities), |
1853 | (unsigned long)NULL, VM_PKT_DATA_INBAND, 0); | |
9aa8b50b | 1854 | if (ret) |
221f6df0 | 1855 | goto out; |
9aa8b50b S |
1856 | |
1857 | t = wait_for_completion_timeout(&dm_device.host_event, 5*HZ); | |
1858 | if (t == 0) { | |
1859 | ret = -ETIMEDOUT; | |
221f6df0 | 1860 | goto out; |
9aa8b50b S |
1861 | } |
1862 | ||
1863 | /* | |
1864 | * If the host does not like our capabilities, | |
1865 | * fail the probe function. | |
1866 | */ | |
1867 | if (dm_device.state == DM_INIT_ERROR) { | |
221f6df0 DC |
1868 | ret = -EPROTO; |
1869 | goto out; | |
9aa8b50b S |
1870 | } |
1871 | ||
221f6df0 DC |
1872 | return 0; |
1873 | out: | |
1874 | vmbus_close(dev->channel); | |
1875 | return ret; | |
1876 | } | |
1877 | ||
d180e0a1 AA |
1878 | /* |
1879 | * DEBUGFS Interface | |
1880 | */ | |
1881 | #ifdef CONFIG_DEBUG_FS | |
1882 | ||
1883 | /** | |
1884 | * hv_balloon_debug_show - shows statistics of balloon operations. | |
1885 | * @f: pointer to the &struct seq_file. | |
1886 | * @offset: ignored. | |
1887 | * | |
1888 | * Provides the statistics that can be accessed in hv-balloon in the debugfs. | |
1889 | * | |
1890 | * Return: zero on success or an error code. | |
1891 | */ | |
1892 | static int hv_balloon_debug_show(struct seq_file *f, void *offset) | |
1893 | { | |
1894 | struct hv_dynmem_device *dm = f->private; | |
1895 | char *sname; | |
1896 | ||
1897 | seq_printf(f, "%-22s: %u.%u\n", "host_version", | |
1898 | DYNMEM_MAJOR_VERSION(dm->version), | |
1899 | DYNMEM_MINOR_VERSION(dm->version)); | |
1900 | ||
1901 | seq_printf(f, "%-22s:", "capabilities"); | |
1902 | if (ballooning_enabled()) | |
1903 | seq_puts(f, " enabled"); | |
1904 | ||
1905 | if (hot_add_enabled()) | |
1906 | seq_puts(f, " hot_add"); | |
1907 | ||
1908 | seq_puts(f, "\n"); | |
1909 | ||
1910 | seq_printf(f, "%-22s: %u", "state", dm->state); | |
1911 | switch (dm->state) { | |
1912 | case DM_INITIALIZING: | |
1913 | sname = "Initializing"; | |
1914 | break; | |
1915 | case DM_INITIALIZED: | |
1916 | sname = "Initialized"; | |
1917 | break; | |
1918 | case DM_BALLOON_UP: | |
1919 | sname = "Balloon Up"; | |
1920 | break; | |
1921 | case DM_BALLOON_DOWN: | |
1922 | sname = "Balloon Down"; | |
1923 | break; | |
1924 | case DM_HOT_ADD: | |
1925 | sname = "Hot Add"; | |
1926 | break; | |
1927 | case DM_INIT_ERROR: | |
1928 | sname = "Error"; | |
1929 | break; | |
1930 | default: | |
1931 | sname = "Unknown"; | |
1932 | } | |
1933 | seq_printf(f, " (%s)\n", sname); | |
1934 | ||
1935 | /* HV Page Size */ | |
1936 | seq_printf(f, "%-22s: %ld\n", "page_size", HV_HYP_PAGE_SIZE); | |
1937 | ||
1938 | /* Pages added with hot_add */ | |
1939 | seq_printf(f, "%-22s: %u\n", "pages_added", dm->num_pages_added); | |
1940 | ||
1941 | /* pages that are "onlined"/used from pages_added */ | |
1942 | seq_printf(f, "%-22s: %u\n", "pages_onlined", dm->num_pages_onlined); | |
1943 | ||
1944 | /* pages we have given back to host */ | |
1945 | seq_printf(f, "%-22s: %u\n", "pages_ballooned", dm->num_pages_ballooned); | |
1946 | ||
1947 | seq_printf(f, "%-22s: %lu\n", "total_pages_committed", | |
1948 | get_pages_committed(dm)); | |
1949 | ||
1950 | seq_printf(f, "%-22s: %llu\n", "max_dynamic_page_count", | |
1951 | dm->max_dynamic_page_count); | |
1952 | ||
1953 | return 0; | |
1954 | } | |
1955 | ||
1956 | DEFINE_SHOW_ATTRIBUTE(hv_balloon_debug); | |
1957 | ||
1958 | static void hv_balloon_debugfs_init(struct hv_dynmem_device *b) | |
1959 | { | |
1960 | debugfs_create_file("hv-balloon", 0444, NULL, b, | |
1961 | &hv_balloon_debug_fops); | |
1962 | } | |
1963 | ||
1964 | static void hv_balloon_debugfs_exit(struct hv_dynmem_device *b) | |
1965 | { | |
6dfb0771 | 1966 | debugfs_lookup_and_remove("hv-balloon", NULL); |
d180e0a1 AA |
1967 | } |
1968 | ||
1969 | #else | |
1970 | ||
1971 | static inline void hv_balloon_debugfs_init(struct hv_dynmem_device *b) | |
1972 | { | |
1973 | } | |
1974 | ||
1975 | static inline void hv_balloon_debugfs_exit(struct hv_dynmem_device *b) | |
1976 | { | |
1977 | } | |
1978 | ||
1979 | #endif /* CONFIG_DEBUG_FS */ | |
1980 | ||
221f6df0 DC |
1981 | static int balloon_probe(struct hv_device *dev, |
1982 | const struct hv_vmbus_device_id *dev_id) | |
1983 | { | |
1984 | int ret; | |
1985 | ||
25bd2b2f DC |
1986 | allow_hibernation = hv_is_hibernation_supported(); |
1987 | if (allow_hibernation) | |
1988 | hot_add = false; | |
1989 | ||
221f6df0 DC |
1990 | #ifdef CONFIG_MEMORY_HOTPLUG |
1991 | do_hot_add = hot_add; | |
1992 | #else | |
1993 | do_hot_add = false; | |
1994 | #endif | |
1995 | dm_device.dev = dev; | |
1996 | dm_device.state = DM_INITIALIZING; | |
1997 | dm_device.next_version = DYNMEM_PROTOCOL_VERSION_WIN8; | |
1998 | init_completion(&dm_device.host_event); | |
1999 | init_completion(&dm_device.config_event); | |
2000 | INIT_LIST_HEAD(&dm_device.ha_region_list); | |
2001 | spin_lock_init(&dm_device.ha_lock); | |
2002 | INIT_WORK(&dm_device.balloon_wrk.wrk, balloon_up); | |
2003 | INIT_WORK(&dm_device.ha_wrk.wrk, hot_add_req); | |
2004 | dm_device.host_specified_ha_region = false; | |
2005 | ||
2006 | #ifdef CONFIG_MEMORY_HOTPLUG | |
2007 | set_online_page_callback(&hv_online_page); | |
bc58ebd5 | 2008 | init_completion(&dm_device.ol_waitevent); |
221f6df0 DC |
2009 | register_memory_notifier(&hv_memory_nb); |
2010 | #endif | |
2011 | ||
2012 | hv_set_drvdata(dev, &dm_device); | |
2013 | ||
2014 | ret = balloon_connect_vsp(dev); | |
2015 | if (ret != 0) | |
d27423bf | 2016 | goto connect_error; |
221f6df0 | 2017 | |
6dc2a774 | 2018 | enable_page_reporting(); |
9aa8b50b | 2019 | dm_device.state = DM_INITIALIZED; |
221f6df0 DC |
2020 | |
2021 | dm_device.thread = | |
2022 | kthread_run(dm_thread_func, &dm_device, "hv_balloon"); | |
2023 | if (IS_ERR(dm_device.thread)) { | |
2024 | ret = PTR_ERR(dm_device.thread); | |
2025 | goto probe_error; | |
2026 | } | |
9aa8b50b | 2027 | |
d180e0a1 AA |
2028 | hv_balloon_debugfs_init(&dm_device); |
2029 | ||
9aa8b50b S |
2030 | return 0; |
2031 | ||
221f6df0 | 2032 | probe_error: |
25bd2b2f DC |
2033 | dm_device.state = DM_INIT_ERROR; |
2034 | dm_device.thread = NULL; | |
6dc2a774 | 2035 | disable_page_reporting(); |
221f6df0 | 2036 | vmbus_close(dev->channel); |
d27423bf | 2037 | connect_error: |
1cac8cd4 | 2038 | #ifdef CONFIG_MEMORY_HOTPLUG |
221f6df0 | 2039 | unregister_memory_notifier(&hv_memory_nb); |
1cac8cd4 S |
2040 | restore_online_page_callback(&hv_online_page); |
2041 | #endif | |
9aa8b50b S |
2042 | return ret; |
2043 | } | |
2044 | ||
96ec2939 | 2045 | static void balloon_remove(struct hv_device *dev) |
9aa8b50b S |
2046 | { |
2047 | struct hv_dynmem_device *dm = hv_get_drvdata(dev); | |
eece30b9 | 2048 | struct hv_hotadd_state *has, *tmp; |
cb7a5724 | 2049 | struct hv_hotadd_gap *gap, *tmp_gap; |
eece30b9 | 2050 | unsigned long flags; |
9aa8b50b S |
2051 | |
2052 | if (dm->num_pages_ballooned != 0) | |
2053 | pr_warn("Ballooned pages: %d\n", dm->num_pages_ballooned); | |
2054 | ||
d180e0a1 AA |
2055 | hv_balloon_debugfs_exit(dm); |
2056 | ||
6571b2da | 2057 | cancel_work_sync(&dm->balloon_wrk.wrk); |
c51af826 | 2058 | cancel_work_sync(&dm->ha_wrk.wrk); |
1cac8cd4 | 2059 | |
9aa8b50b | 2060 | kthread_stop(dm->thread); |
d27423bf SG |
2061 | |
2062 | /* | |
2063 | * This is to handle the case when balloon_resume() | |
2064 | * call has failed and some cleanup has been done as | |
2065 | * a part of the error handling. | |
2066 | */ | |
2067 | if (dm_device.state != DM_INIT_ERROR) { | |
2068 | disable_page_reporting(); | |
2069 | vmbus_close(dev->channel); | |
1cac8cd4 | 2070 | #ifdef CONFIG_MEMORY_HOTPLUG |
d27423bf SG |
2071 | unregister_memory_notifier(&hv_memory_nb); |
2072 | restore_online_page_callback(&hv_online_page); | |
1cac8cd4 | 2073 | #endif |
d27423bf SG |
2074 | } |
2075 | ||
eece30b9 VK |
2076 | spin_lock_irqsave(&dm_device.ha_lock, flags); |
2077 | list_for_each_entry_safe(has, tmp, &dm->ha_region_list, list) { | |
cb7a5724 VK |
2078 | list_for_each_entry_safe(gap, tmp_gap, &has->gap_list, list) { |
2079 | list_del(&gap->list); | |
2080 | kfree(gap); | |
2081 | } | |
1cac8cd4 S |
2082 | list_del(&has->list); |
2083 | kfree(has); | |
2084 | } | |
eece30b9 | 2085 | spin_unlock_irqrestore(&dm_device.ha_lock, flags); |
9aa8b50b S |
2086 | } |
2087 | ||
25bd2b2f DC |
2088 | static int balloon_suspend(struct hv_device *hv_dev) |
2089 | { | |
2090 | struct hv_dynmem_device *dm = hv_get_drvdata(hv_dev); | |
2091 | ||
2092 | tasklet_disable(&hv_dev->channel->callback_event); | |
2093 | ||
2094 | cancel_work_sync(&dm->balloon_wrk.wrk); | |
2095 | cancel_work_sync(&dm->ha_wrk.wrk); | |
2096 | ||
2097 | if (dm->thread) { | |
2098 | kthread_stop(dm->thread); | |
2099 | dm->thread = NULL; | |
2100 | vmbus_close(hv_dev->channel); | |
2101 | } | |
2102 | ||
2103 | tasklet_enable(&hv_dev->channel->callback_event); | |
2104 | ||
2105 | return 0; | |
2106 | ||
2107 | } | |
2108 | ||
2109 | static int balloon_resume(struct hv_device *dev) | |
2110 | { | |
2111 | int ret; | |
2112 | ||
2113 | dm_device.state = DM_INITIALIZING; | |
2114 | ||
2115 | ret = balloon_connect_vsp(dev); | |
2116 | ||
2117 | if (ret != 0) | |
2118 | goto out; | |
2119 | ||
2120 | dm_device.thread = | |
2121 | kthread_run(dm_thread_func, &dm_device, "hv_balloon"); | |
2122 | if (IS_ERR(dm_device.thread)) { | |
2123 | ret = PTR_ERR(dm_device.thread); | |
2124 | dm_device.thread = NULL; | |
2125 | goto close_channel; | |
2126 | } | |
2127 | ||
2128 | dm_device.state = DM_INITIALIZED; | |
2129 | return 0; | |
2130 | close_channel: | |
2131 | vmbus_close(dev->channel); | |
2132 | out: | |
2133 | dm_device.state = DM_INIT_ERROR; | |
d27423bf | 2134 | disable_page_reporting(); |
25bd2b2f DC |
2135 | #ifdef CONFIG_MEMORY_HOTPLUG |
2136 | unregister_memory_notifier(&hv_memory_nb); | |
2137 | restore_online_page_callback(&hv_online_page); | |
2138 | #endif | |
2139 | return ret; | |
2140 | } | |
2141 | ||
9aa8b50b S |
2142 | static const struct hv_vmbus_device_id id_table[] = { |
2143 | /* Dynamic Memory Class ID */ | |
2144 | /* 525074DC-8985-46e2-8057-A307DC18A502 */ | |
d13984e5 | 2145 | { HV_DM_GUID, }, |
9aa8b50b S |
2146 | { }, |
2147 | }; | |
2148 | ||
2149 | MODULE_DEVICE_TABLE(vmbus, id_table); | |
2150 | ||
2151 | static struct hv_driver balloon_drv = { | |
2152 | .name = "hv_balloon", | |
2153 | .id_table = id_table, | |
2154 | .probe = balloon_probe, | |
2155 | .remove = balloon_remove, | |
25bd2b2f DC |
2156 | .suspend = balloon_suspend, |
2157 | .resume = balloon_resume, | |
af0a5646 AV |
2158 | .driver = { |
2159 | .probe_type = PROBE_PREFER_ASYNCHRONOUS, | |
2160 | }, | |
9aa8b50b S |
2161 | }; |
2162 | ||
2163 | static int __init init_balloon_drv(void) | |
2164 | { | |
2165 | ||
2166 | return vmbus_driver_register(&balloon_drv); | |
2167 | } | |
2168 | ||
9aa8b50b | 2169 | module_init(init_balloon_drv); |
9aa8b50b S |
2170 | |
2171 | MODULE_DESCRIPTION("Hyper-V Balloon"); | |
9aa8b50b | 2172 | MODULE_LICENSE("GPL"); |