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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 S |
13 | #include <linux/mman.h> |
14 | #include <linux/delay.h> | |
15 | #include <linux/init.h> | |
16 | #include <linux/module.h> | |
17 | #include <linux/slab.h> | |
18 | #include <linux/kthread.h> | |
19 | #include <linux/completion.h> | |
20 | #include <linux/memory_hotplug.h> | |
21 | #include <linux/memory.h> | |
22 | #include <linux/notifier.h> | |
9aa8b50b S |
23 | #include <linux/percpu_counter.h> |
24 | ||
25 | #include <linux/hyperv.h> | |
26 | ||
cf21be91 VK |
27 | #define CREATE_TRACE_POINTS |
28 | #include "hv_trace_balloon.h" | |
29 | ||
9aa8b50b S |
30 | /* |
31 | * We begin with definitions supporting the Dynamic Memory protocol | |
32 | * with the host. | |
33 | * | |
34 | * Begin protocol definitions. | |
35 | */ | |
36 | ||
37 | ||
38 | ||
39 | /* | |
40 | * Protocol versions. The low word is the minor version, the high word the major | |
41 | * version. | |
42 | * | |
43 | * History: | |
44 | * Initial version 1.0 | |
45 | * Changed to 0.1 on 2009/03/25 | |
46 | * Changes to 0.2 on 2009/05/14 | |
47 | * Changes to 0.3 on 2009/12/03 | |
48 | * Changed to 1.0 on 2011/04/05 | |
49 | */ | |
50 | ||
51 | #define DYNMEM_MAKE_VERSION(Major, Minor) ((__u32)(((Major) << 16) | (Minor))) | |
52 | #define DYNMEM_MAJOR_VERSION(Version) ((__u32)(Version) >> 16) | |
53 | #define DYNMEM_MINOR_VERSION(Version) ((__u32)(Version) & 0xff) | |
54 | ||
55 | enum { | |
56 | DYNMEM_PROTOCOL_VERSION_1 = DYNMEM_MAKE_VERSION(0, 3), | |
57 | DYNMEM_PROTOCOL_VERSION_2 = DYNMEM_MAKE_VERSION(1, 0), | |
b6ddeae1 | 58 | DYNMEM_PROTOCOL_VERSION_3 = DYNMEM_MAKE_VERSION(2, 0), |
9aa8b50b S |
59 | |
60 | DYNMEM_PROTOCOL_VERSION_WIN7 = DYNMEM_PROTOCOL_VERSION_1, | |
61 | DYNMEM_PROTOCOL_VERSION_WIN8 = DYNMEM_PROTOCOL_VERSION_2, | |
b6ddeae1 | 62 | DYNMEM_PROTOCOL_VERSION_WIN10 = DYNMEM_PROTOCOL_VERSION_3, |
9aa8b50b | 63 | |
b6ddeae1 | 64 | DYNMEM_PROTOCOL_VERSION_CURRENT = DYNMEM_PROTOCOL_VERSION_WIN10 |
9aa8b50b S |
65 | }; |
66 | ||
67 | ||
68 | ||
69 | /* | |
70 | * Message Types | |
71 | */ | |
72 | ||
73 | enum dm_message_type { | |
74 | /* | |
75 | * Version 0.3 | |
76 | */ | |
77 | DM_ERROR = 0, | |
78 | DM_VERSION_REQUEST = 1, | |
79 | DM_VERSION_RESPONSE = 2, | |
80 | DM_CAPABILITIES_REPORT = 3, | |
81 | DM_CAPABILITIES_RESPONSE = 4, | |
82 | DM_STATUS_REPORT = 5, | |
83 | DM_BALLOON_REQUEST = 6, | |
84 | DM_BALLOON_RESPONSE = 7, | |
85 | DM_UNBALLOON_REQUEST = 8, | |
86 | DM_UNBALLOON_RESPONSE = 9, | |
87 | DM_MEM_HOT_ADD_REQUEST = 10, | |
88 | DM_MEM_HOT_ADD_RESPONSE = 11, | |
89 | DM_VERSION_03_MAX = 11, | |
90 | /* | |
91 | * Version 1.0. | |
92 | */ | |
93 | DM_INFO_MESSAGE = 12, | |
94 | DM_VERSION_1_MAX = 12 | |
95 | }; | |
96 | ||
97 | ||
98 | /* | |
99 | * Structures defining the dynamic memory management | |
100 | * protocol. | |
101 | */ | |
102 | ||
103 | union dm_version { | |
104 | struct { | |
105 | __u16 minor_version; | |
106 | __u16 major_version; | |
107 | }; | |
108 | __u32 version; | |
109 | } __packed; | |
110 | ||
111 | ||
112 | union dm_caps { | |
113 | struct { | |
114 | __u64 balloon:1; | |
115 | __u64 hot_add:1; | |
647965a2 S |
116 | /* |
117 | * To support guests that may have alignment | |
118 | * limitations on hot-add, the guest can specify | |
119 | * its alignment requirements; a value of n | |
120 | * represents an alignment of 2^n in mega bytes. | |
121 | */ | |
122 | __u64 hot_add_alignment:4; | |
123 | __u64 reservedz:58; | |
9aa8b50b S |
124 | } cap_bits; |
125 | __u64 caps; | |
126 | } __packed; | |
127 | ||
128 | union dm_mem_page_range { | |
129 | struct { | |
130 | /* | |
131 | * The PFN number of the first page in the range. | |
132 | * 40 bits is the architectural limit of a PFN | |
133 | * number for AMD64. | |
134 | */ | |
135 | __u64 start_page:40; | |
136 | /* | |
137 | * The number of pages in the range. | |
138 | */ | |
139 | __u64 page_cnt:24; | |
140 | } finfo; | |
141 | __u64 page_range; | |
142 | } __packed; | |
143 | ||
144 | ||
145 | ||
146 | /* | |
147 | * The header for all dynamic memory messages: | |
148 | * | |
149 | * type: Type of the message. | |
150 | * size: Size of the message in bytes; including the header. | |
151 | * trans_id: The guest is responsible for manufacturing this ID. | |
152 | */ | |
153 | ||
154 | struct dm_header { | |
155 | __u16 type; | |
156 | __u16 size; | |
157 | __u32 trans_id; | |
158 | } __packed; | |
159 | ||
160 | /* | |
161 | * A generic message format for dynamic memory. | |
162 | * Specific message formats are defined later in the file. | |
163 | */ | |
164 | ||
165 | struct dm_message { | |
166 | struct dm_header hdr; | |
167 | __u8 data[]; /* enclosed message */ | |
168 | } __packed; | |
169 | ||
170 | ||
171 | /* | |
172 | * Specific message types supporting the dynamic memory protocol. | |
173 | */ | |
174 | ||
175 | /* | |
176 | * Version negotiation message. Sent from the guest to the host. | |
177 | * The guest is free to try different versions until the host | |
178 | * accepts the version. | |
179 | * | |
180 | * dm_version: The protocol version requested. | |
181 | * is_last_attempt: If TRUE, this is the last version guest will request. | |
182 | * reservedz: Reserved field, set to zero. | |
183 | */ | |
184 | ||
185 | struct dm_version_request { | |
186 | struct dm_header hdr; | |
187 | union dm_version version; | |
188 | __u32 is_last_attempt:1; | |
189 | __u32 reservedz:31; | |
190 | } __packed; | |
191 | ||
192 | /* | |
193 | * Version response message; Host to Guest and indicates | |
194 | * if the host has accepted the version sent by the guest. | |
195 | * | |
196 | * is_accepted: If TRUE, host has accepted the version and the guest | |
197 | * should proceed to the next stage of the protocol. FALSE indicates that | |
198 | * guest should re-try with a different version. | |
199 | * | |
200 | * reservedz: Reserved field, set to zero. | |
201 | */ | |
202 | ||
203 | struct dm_version_response { | |
204 | struct dm_header hdr; | |
205 | __u64 is_accepted:1; | |
206 | __u64 reservedz:63; | |
207 | } __packed; | |
208 | ||
209 | /* | |
210 | * Message reporting capabilities. This is sent from the guest to the | |
211 | * host. | |
212 | */ | |
213 | ||
214 | struct dm_capabilities { | |
215 | struct dm_header hdr; | |
216 | union dm_caps caps; | |
217 | __u64 min_page_cnt; | |
218 | __u64 max_page_number; | |
219 | } __packed; | |
220 | ||
221 | /* | |
222 | * Response to the capabilities message. This is sent from the host to the | |
223 | * guest. This message notifies if the host has accepted the guest's | |
224 | * capabilities. If the host has not accepted, the guest must shutdown | |
225 | * the service. | |
226 | * | |
227 | * is_accepted: Indicates if the host has accepted guest's capabilities. | |
228 | * reservedz: Must be 0. | |
229 | */ | |
230 | ||
231 | struct dm_capabilities_resp_msg { | |
232 | struct dm_header hdr; | |
233 | __u64 is_accepted:1; | |
234 | __u64 reservedz:63; | |
235 | } __packed; | |
236 | ||
237 | /* | |
238 | * This message is used to report memory pressure from the guest. | |
239 | * This message is not part of any transaction and there is no | |
240 | * response to this message. | |
241 | * | |
242 | * num_avail: Available memory in pages. | |
243 | * num_committed: Committed memory in pages. | |
244 | * page_file_size: The accumulated size of all page files | |
245 | * in the system in pages. | |
246 | * zero_free: The nunber of zero and free pages. | |
247 | * page_file_writes: The writes to the page file in pages. | |
248 | * io_diff: An indicator of file cache efficiency or page file activity, | |
249 | * calculated as File Cache Page Fault Count - Page Read Count. | |
250 | * This value is in pages. | |
251 | * | |
252 | * Some of these metrics are Windows specific and fortunately | |
253 | * the algorithm on the host side that computes the guest memory | |
254 | * pressure only uses num_committed value. | |
255 | */ | |
256 | ||
257 | struct dm_status { | |
258 | struct dm_header hdr; | |
259 | __u64 num_avail; | |
260 | __u64 num_committed; | |
261 | __u64 page_file_size; | |
262 | __u64 zero_free; | |
263 | __u32 page_file_writes; | |
264 | __u32 io_diff; | |
265 | } __packed; | |
266 | ||
267 | ||
268 | /* | |
269 | * Message to ask the guest to allocate memory - balloon up message. | |
270 | * This message is sent from the host to the guest. The guest may not be | |
271 | * able to allocate as much memory as requested. | |
272 | * | |
273 | * num_pages: number of pages to allocate. | |
274 | */ | |
275 | ||
276 | struct dm_balloon { | |
277 | struct dm_header hdr; | |
278 | __u32 num_pages; | |
279 | __u32 reservedz; | |
280 | } __packed; | |
281 | ||
282 | ||
283 | /* | |
284 | * Balloon response message; this message is sent from the guest | |
285 | * to the host in response to the balloon message. | |
286 | * | |
287 | * reservedz: Reserved; must be set to zero. | |
288 | * more_pages: If FALSE, this is the last message of the transaction. | |
289 | * if TRUE there will atleast one more message from the guest. | |
290 | * | |
291 | * range_count: The number of ranges in the range array. | |
292 | * | |
293 | * range_array: An array of page ranges returned to the host. | |
294 | * | |
295 | */ | |
296 | ||
297 | struct dm_balloon_response { | |
298 | struct dm_header hdr; | |
299 | __u32 reservedz; | |
300 | __u32 more_pages:1; | |
301 | __u32 range_count:31; | |
302 | union dm_mem_page_range range_array[]; | |
303 | } __packed; | |
304 | ||
305 | /* | |
306 | * Un-balloon message; this message is sent from the host | |
307 | * to the guest to give guest more memory. | |
308 | * | |
309 | * more_pages: If FALSE, this is the last message of the transaction. | |
310 | * if TRUE there will atleast one more message from the guest. | |
311 | * | |
312 | * reservedz: Reserved; must be set to zero. | |
313 | * | |
314 | * range_count: The number of ranges in the range array. | |
315 | * | |
316 | * range_array: An array of page ranges returned to the host. | |
317 | * | |
318 | */ | |
319 | ||
320 | struct dm_unballoon_request { | |
321 | struct dm_header hdr; | |
322 | __u32 more_pages:1; | |
323 | __u32 reservedz:31; | |
324 | __u32 range_count; | |
325 | union dm_mem_page_range range_array[]; | |
326 | } __packed; | |
327 | ||
328 | /* | |
329 | * Un-balloon response message; this message is sent from the guest | |
330 | * to the host in response to an unballoon request. | |
331 | * | |
332 | */ | |
333 | ||
334 | struct dm_unballoon_response { | |
335 | struct dm_header hdr; | |
336 | } __packed; | |
337 | ||
338 | ||
339 | /* | |
340 | * Hot add request message. Message sent from the host to the guest. | |
341 | * | |
342 | * mem_range: Memory range to hot add. | |
343 | * | |
344 | * On Linux we currently don't support this since we cannot hot add | |
345 | * arbitrary granularity of memory. | |
346 | */ | |
347 | ||
348 | struct dm_hot_add { | |
349 | struct dm_header hdr; | |
350 | union dm_mem_page_range range; | |
351 | } __packed; | |
352 | ||
353 | /* | |
354 | * Hot add response message. | |
355 | * This message is sent by the guest to report the status of a hot add request. | |
356 | * If page_count is less than the requested page count, then the host should | |
357 | * assume all further hot add requests will fail, since this indicates that | |
358 | * the guest has hit an upper physical memory barrier. | |
359 | * | |
360 | * Hot adds may also fail due to low resources; in this case, the guest must | |
361 | * not complete this message until the hot add can succeed, and the host must | |
362 | * not send a new hot add request until the response is sent. | |
363 | * If VSC fails to hot add memory DYNMEM_NUMBER_OF_UNSUCCESSFUL_HOTADD_ATTEMPTS | |
364 | * times it fails the request. | |
365 | * | |
366 | * | |
367 | * page_count: number of pages that were successfully hot added. | |
368 | * | |
369 | * result: result of the operation 1: success, 0: failure. | |
370 | * | |
371 | */ | |
372 | ||
373 | struct dm_hot_add_response { | |
374 | struct dm_header hdr; | |
375 | __u32 page_count; | |
376 | __u32 result; | |
377 | } __packed; | |
378 | ||
379 | /* | |
380 | * Types of information sent from host to the guest. | |
381 | */ | |
382 | ||
383 | enum dm_info_type { | |
384 | INFO_TYPE_MAX_PAGE_CNT = 0, | |
385 | MAX_INFO_TYPE | |
386 | }; | |
387 | ||
388 | ||
389 | /* | |
390 | * Header for the information message. | |
391 | */ | |
392 | ||
393 | struct dm_info_header { | |
394 | enum dm_info_type type; | |
395 | __u32 data_size; | |
396 | } __packed; | |
397 | ||
398 | /* | |
399 | * This message is sent from the host to the guest to pass | |
400 | * some relevant information (win8 addition). | |
401 | * | |
402 | * reserved: no used. | |
403 | * info_size: size of the information blob. | |
404 | * info: information blob. | |
405 | */ | |
406 | ||
407 | struct dm_info_msg { | |
6427a0d7 | 408 | struct dm_header hdr; |
9aa8b50b S |
409 | __u32 reserved; |
410 | __u32 info_size; | |
411 | __u8 info[]; | |
412 | }; | |
413 | ||
414 | /* | |
415 | * End protocol definitions. | |
416 | */ | |
417 | ||
1cac8cd4 S |
418 | /* |
419 | * State to manage hot adding memory into the guest. | |
420 | * The range start_pfn : end_pfn specifies the range | |
421 | * that the host has asked us to hot add. The range | |
422 | * start_pfn : ha_end_pfn specifies the range that we have | |
423 | * currently hot added. We hot add in multiples of 128M | |
424 | * chunks; it is possible that we may not be able to bring | |
425 | * online all the pages in the region. The range | |
7cf3b79e | 426 | * covered_start_pfn:covered_end_pfn defines the pages that can |
1cac8cd4 S |
427 | * be brough online. |
428 | */ | |
429 | ||
430 | struct hv_hotadd_state { | |
431 | struct list_head list; | |
432 | unsigned long start_pfn; | |
7cf3b79e | 433 | unsigned long covered_start_pfn; |
1cac8cd4 S |
434 | unsigned long covered_end_pfn; |
435 | unsigned long ha_end_pfn; | |
436 | unsigned long end_pfn; | |
cb7a5724 VK |
437 | /* |
438 | * A list of gaps. | |
439 | */ | |
440 | struct list_head gap_list; | |
441 | }; | |
442 | ||
443 | struct hv_hotadd_gap { | |
444 | struct list_head list; | |
445 | unsigned long start_pfn; | |
446 | unsigned long end_pfn; | |
1cac8cd4 S |
447 | }; |
448 | ||
6571b2da S |
449 | struct balloon_state { |
450 | __u32 num_pages; | |
451 | struct work_struct wrk; | |
452 | }; | |
453 | ||
c51af826 S |
454 | struct hot_add_wrk { |
455 | union dm_mem_page_range ha_page_range; | |
1cac8cd4 | 456 | union dm_mem_page_range ha_region_range; |
c51af826 S |
457 | struct work_struct wrk; |
458 | }; | |
459 | ||
1cac8cd4 | 460 | static bool hot_add = true; |
9aa8b50b | 461 | static bool do_hot_add; |
e500d158 S |
462 | /* |
463 | * Delay reporting memory pressure by | |
464 | * the specified number of seconds. | |
465 | */ | |
1cac8cd4 | 466 | static uint pressure_report_delay = 45; |
9aa8b50b | 467 | |
ae339336 S |
468 | /* |
469 | * The last time we posted a pressure report to host. | |
470 | */ | |
471 | static unsigned long last_post_time; | |
472 | ||
9aa8b50b S |
473 | module_param(hot_add, bool, (S_IRUGO | S_IWUSR)); |
474 | MODULE_PARM_DESC(hot_add, "If set attempt memory hot_add"); | |
475 | ||
e500d158 S |
476 | module_param(pressure_report_delay, uint, (S_IRUGO | S_IWUSR)); |
477 | MODULE_PARM_DESC(pressure_report_delay, "Delay in secs in reporting pressure"); | |
9aa8b50b S |
478 | static atomic_t trans_id = ATOMIC_INIT(0); |
479 | ||
480 | static int dm_ring_size = (5 * PAGE_SIZE); | |
481 | ||
482 | /* | |
483 | * Driver specific state. | |
484 | */ | |
485 | ||
486 | enum hv_dm_state { | |
487 | DM_INITIALIZING = 0, | |
488 | DM_INITIALIZED, | |
489 | DM_BALLOON_UP, | |
490 | DM_BALLOON_DOWN, | |
491 | DM_HOT_ADD, | |
492 | DM_INIT_ERROR | |
493 | }; | |
494 | ||
495 | ||
496 | static __u8 recv_buffer[PAGE_SIZE]; | |
1fed17df | 497 | static __u8 balloon_up_send_buffer[PAGE_SIZE]; |
9aa8b50b | 498 | #define PAGES_IN_2M 512 |
1cac8cd4 | 499 | #define HA_CHUNK (32 * 1024) |
9aa8b50b S |
500 | |
501 | struct hv_dynmem_device { | |
502 | struct hv_device *dev; | |
503 | enum hv_dm_state state; | |
504 | struct completion host_event; | |
505 | struct completion config_event; | |
506 | ||
507 | /* | |
508 | * Number of pages we have currently ballooned out. | |
509 | */ | |
510 | unsigned int num_pages_ballooned; | |
549fd280 VK |
511 | unsigned int num_pages_onlined; |
512 | unsigned int num_pages_added; | |
9aa8b50b S |
513 | |
514 | /* | |
6571b2da S |
515 | * State to manage the ballooning (up) operation. |
516 | */ | |
517 | struct balloon_state balloon_wrk; | |
518 | ||
c51af826 S |
519 | /* |
520 | * State to execute the "hot-add" operation. | |
521 | */ | |
522 | struct hot_add_wrk ha_wrk; | |
523 | ||
1cac8cd4 S |
524 | /* |
525 | * This state tracks if the host has specified a hot-add | |
526 | * region. | |
527 | */ | |
528 | bool host_specified_ha_region; | |
529 | ||
530 | /* | |
531 | * State to synchronize hot-add. | |
532 | */ | |
533 | struct completion ol_waitevent; | |
534 | bool ha_waiting; | |
6571b2da S |
535 | /* |
536 | * This thread handles hot-add | |
9aa8b50b S |
537 | * requests from the host as well as notifying |
538 | * the host with regards to memory pressure in | |
539 | * the guest. | |
540 | */ | |
541 | struct task_struct *thread; | |
542 | ||
eece30b9 VK |
543 | /* |
544 | * Protects ha_region_list, num_pages_onlined counter and individual | |
545 | * regions from ha_region_list. | |
546 | */ | |
547 | spinlock_t ha_lock; | |
22f88475 | 548 | |
1cac8cd4 S |
549 | /* |
550 | * A list of hot-add regions. | |
551 | */ | |
552 | struct list_head ha_region_list; | |
553 | ||
9aa8b50b S |
554 | /* |
555 | * We start with the highest version we can support | |
556 | * and downgrade based on the host; we save here the | |
557 | * next version to try. | |
558 | */ | |
559 | __u32 next_version; | |
b3bb97b8 AN |
560 | |
561 | /* | |
562 | * The negotiated version agreed by host. | |
563 | */ | |
564 | __u32 version; | |
9aa8b50b S |
565 | }; |
566 | ||
567 | static struct hv_dynmem_device dm_device; | |
568 | ||
ae339336 | 569 | static void post_status(struct hv_dynmem_device *dm); |
22f88475 | 570 | |
1cac8cd4 | 571 | #ifdef CONFIG_MEMORY_HOTPLUG |
bba072d1 VK |
572 | static inline bool has_pfn_is_backed(struct hv_hotadd_state *has, |
573 | unsigned long pfn) | |
574 | { | |
575 | struct hv_hotadd_gap *gap; | |
576 | ||
577 | /* The page is not backed. */ | |
578 | if ((pfn < has->covered_start_pfn) || (pfn >= has->covered_end_pfn)) | |
579 | return false; | |
580 | ||
581 | /* Check for gaps. */ | |
582 | list_for_each_entry(gap, &has->gap_list, list) { | |
583 | if ((pfn >= gap->start_pfn) && (pfn < gap->end_pfn)) | |
584 | return false; | |
585 | } | |
586 | ||
587 | return true; | |
588 | } | |
589 | ||
590 | static unsigned long hv_page_offline_check(unsigned long start_pfn, | |
591 | unsigned long nr_pages) | |
592 | { | |
593 | unsigned long pfn = start_pfn, count = 0; | |
594 | struct hv_hotadd_state *has; | |
595 | bool found; | |
596 | ||
597 | while (pfn < start_pfn + nr_pages) { | |
598 | /* | |
599 | * Search for HAS which covers the pfn and when we find one | |
600 | * count how many consequitive PFNs are covered. | |
601 | */ | |
602 | found = false; | |
603 | list_for_each_entry(has, &dm_device.ha_region_list, list) { | |
604 | while ((pfn >= has->start_pfn) && | |
605 | (pfn < has->end_pfn) && | |
606 | (pfn < start_pfn + nr_pages)) { | |
607 | found = true; | |
608 | if (has_pfn_is_backed(has, pfn)) | |
609 | count++; | |
610 | pfn++; | |
611 | } | |
612 | } | |
613 | ||
614 | /* | |
615 | * This PFN is not in any HAS (e.g. we're offlining a region | |
616 | * which was present at boot), no need to account for it. Go | |
617 | * to the next one. | |
618 | */ | |
619 | if (!found) | |
620 | pfn++; | |
621 | } | |
622 | ||
623 | return count; | |
624 | } | |
625 | ||
22f88475 S |
626 | static int hv_memory_notifier(struct notifier_block *nb, unsigned long val, |
627 | void *v) | |
628 | { | |
549fd280 | 629 | struct memory_notify *mem = (struct memory_notify *)v; |
bba072d1 | 630 | unsigned long flags, pfn_count; |
549fd280 | 631 | |
22f88475 | 632 | switch (val) { |
22f88475 S |
633 | case MEM_ONLINE: |
634 | case MEM_CANCEL_ONLINE: | |
22f88475 S |
635 | if (dm_device.ha_waiting) { |
636 | dm_device.ha_waiting = false; | |
637 | complete(&dm_device.ol_waitevent); | |
638 | } | |
639 | break; | |
640 | ||
22f88475 | 641 | case MEM_OFFLINE: |
eece30b9 | 642 | spin_lock_irqsave(&dm_device.ha_lock, flags); |
bba072d1 VK |
643 | pfn_count = hv_page_offline_check(mem->start_pfn, |
644 | mem->nr_pages); | |
645 | if (pfn_count <= dm_device.num_pages_onlined) { | |
646 | dm_device.num_pages_onlined -= pfn_count; | |
647 | } else { | |
648 | /* | |
649 | * We're offlining more pages than we managed to online. | |
650 | * This is unexpected. In any case don't let | |
651 | * num_pages_onlined wrap around zero. | |
652 | */ | |
653 | WARN_ON_ONCE(1); | |
654 | dm_device.num_pages_onlined = 0; | |
655 | } | |
eece30b9 | 656 | spin_unlock_irqrestore(&dm_device.ha_lock, flags); |
549fd280 | 657 | break; |
eece30b9 | 658 | case MEM_GOING_ONLINE: |
549fd280 | 659 | case MEM_GOING_OFFLINE: |
22f88475 S |
660 | case MEM_CANCEL_OFFLINE: |
661 | break; | |
662 | } | |
663 | return NOTIFY_OK; | |
664 | } | |
665 | ||
666 | static struct notifier_block hv_memory_nb = { | |
667 | .notifier_call = hv_memory_notifier, | |
668 | .priority = 0 | |
669 | }; | |
670 | ||
cb7a5724 VK |
671 | /* Check if the particular page is backed and can be onlined and online it. */ |
672 | static void hv_page_online_one(struct hv_hotadd_state *has, struct page *pg) | |
673 | { | |
fae42c4d DH |
674 | if (!has_pfn_is_backed(has, page_to_pfn(pg))) { |
675 | if (!PageOffline(pg)) | |
676 | __SetPageOffline(pg); | |
cb7a5724 | 677 | return; |
fae42c4d DH |
678 | } |
679 | if (PageOffline(pg)) | |
680 | __ClearPageOffline(pg); | |
cb7a5724 | 681 | |
cb7a5724 VK |
682 | /* This frame is currently backed; online the page. */ |
683 | __online_page_set_limits(pg); | |
684 | __online_page_increment_counters(pg); | |
685 | __online_page_free(pg); | |
6df8d9aa | 686 | |
1c87dc89 | 687 | lockdep_assert_held(&dm_device.ha_lock); |
6df8d9aa | 688 | dm_device.num_pages_onlined++; |
cb7a5724 VK |
689 | } |
690 | ||
691 | static void hv_bring_pgs_online(struct hv_hotadd_state *has, | |
692 | unsigned long start_pfn, unsigned long size) | |
9aa8b50b | 693 | { |
1cac8cd4 | 694 | int i; |
9aa8b50b | 695 | |
b3bb97b8 | 696 | pr_debug("Online %lu pages starting at pfn 0x%lx\n", size, start_pfn); |
cb7a5724 VK |
697 | for (i = 0; i < size; i++) |
698 | hv_page_online_one(has, pfn_to_page(start_pfn + i)); | |
1cac8cd4 S |
699 | } |
700 | ||
701 | static void hv_mem_hot_add(unsigned long start, unsigned long size, | |
702 | unsigned long pfn_count, | |
703 | struct hv_hotadd_state *has) | |
704 | { | |
705 | int ret = 0; | |
ed07ec93 | 706 | int i, nid; |
1cac8cd4 S |
707 | unsigned long start_pfn; |
708 | unsigned long processed_pfn; | |
709 | unsigned long total_pfn = pfn_count; | |
eece30b9 | 710 | unsigned long flags; |
1cac8cd4 S |
711 | |
712 | for (i = 0; i < (size/HA_CHUNK); i++) { | |
713 | start_pfn = start + (i * HA_CHUNK); | |
eece30b9 VK |
714 | |
715 | spin_lock_irqsave(&dm_device.ha_lock, flags); | |
1cac8cd4 S |
716 | has->ha_end_pfn += HA_CHUNK; |
717 | ||
718 | if (total_pfn > HA_CHUNK) { | |
719 | processed_pfn = HA_CHUNK; | |
720 | total_pfn -= HA_CHUNK; | |
721 | } else { | |
722 | processed_pfn = total_pfn; | |
723 | total_pfn = 0; | |
724 | } | |
725 | ||
726 | has->covered_end_pfn += processed_pfn; | |
eece30b9 | 727 | spin_unlock_irqrestore(&dm_device.ha_lock, flags); |
9aa8b50b | 728 | |
1cac8cd4 | 729 | init_completion(&dm_device.ol_waitevent); |
a132c54c | 730 | dm_device.ha_waiting = !memhp_auto_online; |
9aa8b50b | 731 | |
1cac8cd4 S |
732 | nid = memory_add_physaddr_to_nid(PFN_PHYS(start_pfn)); |
733 | ret = add_memory(nid, PFN_PHYS((start_pfn)), | |
734 | (HA_CHUNK << PAGE_SHIFT)); | |
735 | ||
736 | if (ret) { | |
223e1e4d | 737 | pr_err("hot_add memory failed error is %d\n", ret); |
7f4f2302 S |
738 | if (ret == -EEXIST) { |
739 | /* | |
740 | * This error indicates that the error | |
741 | * is not a transient failure. This is the | |
742 | * case where the guest's physical address map | |
743 | * precludes hot adding memory. Stop all further | |
744 | * memory hot-add. | |
745 | */ | |
746 | do_hot_add = false; | |
747 | } | |
eece30b9 | 748 | spin_lock_irqsave(&dm_device.ha_lock, flags); |
1cac8cd4 S |
749 | has->ha_end_pfn -= HA_CHUNK; |
750 | has->covered_end_pfn -= processed_pfn; | |
eece30b9 | 751 | spin_unlock_irqrestore(&dm_device.ha_lock, flags); |
1cac8cd4 S |
752 | break; |
753 | } | |
9aa8b50b S |
754 | |
755 | /* | |
a132c54c VK |
756 | * Wait for the memory block to be onlined when memory onlining |
757 | * is done outside of kernel (memhp_auto_online). Since the hot | |
758 | * add has succeeded, it is ok to proceed even if the pages in | |
759 | * the hot added region have not been "onlined" within the | |
760 | * allowed time. | |
9aa8b50b | 761 | */ |
a132c54c VK |
762 | if (dm_device.ha_waiting) |
763 | wait_for_completion_timeout(&dm_device.ol_waitevent, | |
764 | 5*HZ); | |
ae339336 | 765 | post_status(&dm_device); |
9aa8b50b | 766 | } |
1cac8cd4 S |
767 | } |
768 | ||
a9cd410a | 769 | static void hv_online_page(struct page *pg, unsigned int order) |
1cac8cd4 | 770 | { |
1cac8cd4 | 771 | struct hv_hotadd_state *has; |
eece30b9 | 772 | unsigned long flags; |
4f098af5 | 773 | unsigned long pfn = page_to_pfn(pg); |
1cac8cd4 | 774 | |
eece30b9 VK |
775 | spin_lock_irqsave(&dm_device.ha_lock, flags); |
776 | list_for_each_entry(has, &dm_device.ha_region_list, list) { | |
cb7a5724 | 777 | /* The page belongs to a different HAS. */ |
a9cd410a AK |
778 | if ((pfn < has->start_pfn) || |
779 | (pfn + (1UL << order) > has->end_pfn)) | |
cb7a5724 VK |
780 | continue; |
781 | ||
a9cd410a | 782 | hv_bring_pgs_online(has, pfn, 1UL << order); |
cb7a5724 | 783 | break; |
1cac8cd4 | 784 | } |
eece30b9 | 785 | spin_unlock_irqrestore(&dm_device.ha_lock, flags); |
1cac8cd4 S |
786 | } |
787 | ||
cb7a5724 | 788 | static int pfn_covered(unsigned long start_pfn, unsigned long pfn_cnt) |
1cac8cd4 | 789 | { |
1cac8cd4 | 790 | struct hv_hotadd_state *has; |
cb7a5724 | 791 | struct hv_hotadd_gap *gap; |
1cac8cd4 | 792 | unsigned long residual, new_inc; |
eece30b9 VK |
793 | int ret = 0; |
794 | unsigned long flags; | |
1cac8cd4 | 795 | |
eece30b9 VK |
796 | spin_lock_irqsave(&dm_device.ha_lock, flags); |
797 | list_for_each_entry(has, &dm_device.ha_region_list, list) { | |
1cac8cd4 S |
798 | /* |
799 | * If the pfn range we are dealing with is not in the current | |
800 | * "hot add block", move on. | |
801 | */ | |
77c0c973 | 802 | if (start_pfn < has->start_pfn || start_pfn >= has->end_pfn) |
1cac8cd4 | 803 | continue; |
cb7a5724 VK |
804 | |
805 | /* | |
806 | * If the current start pfn is not where the covered_end | |
807 | * is, create a gap and update covered_end_pfn. | |
808 | */ | |
809 | if (has->covered_end_pfn != start_pfn) { | |
810 | gap = kzalloc(sizeof(struct hv_hotadd_gap), GFP_ATOMIC); | |
eece30b9 VK |
811 | if (!gap) { |
812 | ret = -ENOMEM; | |
813 | break; | |
814 | } | |
cb7a5724 VK |
815 | |
816 | INIT_LIST_HEAD(&gap->list); | |
817 | gap->start_pfn = has->covered_end_pfn; | |
818 | gap->end_pfn = start_pfn; | |
819 | list_add_tail(&gap->list, &has->gap_list); | |
820 | ||
821 | has->covered_end_pfn = start_pfn; | |
822 | } | |
823 | ||
1cac8cd4 S |
824 | /* |
825 | * If the current hot add-request extends beyond | |
826 | * our current limit; extend it. | |
827 | */ | |
828 | if ((start_pfn + pfn_cnt) > has->end_pfn) { | |
829 | residual = (start_pfn + pfn_cnt - has->end_pfn); | |
830 | /* | |
831 | * Extend the region by multiples of HA_CHUNK. | |
832 | */ | |
833 | new_inc = (residual / HA_CHUNK) * HA_CHUNK; | |
834 | if (residual % HA_CHUNK) | |
835 | new_inc += HA_CHUNK; | |
836 | ||
837 | has->end_pfn += new_inc; | |
838 | } | |
839 | ||
eece30b9 VK |
840 | ret = 1; |
841 | break; | |
1cac8cd4 | 842 | } |
eece30b9 | 843 | spin_unlock_irqrestore(&dm_device.ha_lock, flags); |
1cac8cd4 | 844 | |
eece30b9 | 845 | return ret; |
1cac8cd4 S |
846 | } |
847 | ||
848 | static unsigned long handle_pg_range(unsigned long pg_start, | |
849 | unsigned long pg_count) | |
850 | { | |
851 | unsigned long start_pfn = pg_start; | |
852 | unsigned long pfn_cnt = pg_count; | |
853 | unsigned long size; | |
1cac8cd4 S |
854 | struct hv_hotadd_state *has; |
855 | unsigned long pgs_ol = 0; | |
856 | unsigned long old_covered_state; | |
eece30b9 | 857 | unsigned long res = 0, flags; |
1cac8cd4 | 858 | |
b3bb97b8 AN |
859 | pr_debug("Hot adding %lu pages starting at pfn 0x%lx.\n", pg_count, |
860 | pg_start); | |
861 | ||
eece30b9 VK |
862 | spin_lock_irqsave(&dm_device.ha_lock, flags); |
863 | list_for_each_entry(has, &dm_device.ha_region_list, list) { | |
1cac8cd4 S |
864 | /* |
865 | * If the pfn range we are dealing with is not in the current | |
866 | * "hot add block", move on. | |
867 | */ | |
77c0c973 | 868 | if (start_pfn < has->start_pfn || start_pfn >= has->end_pfn) |
1cac8cd4 S |
869 | continue; |
870 | ||
871 | old_covered_state = has->covered_end_pfn; | |
872 | ||
873 | if (start_pfn < has->ha_end_pfn) { | |
874 | /* | |
875 | * This is the case where we are backing pages | |
876 | * in an already hot added region. Bring | |
877 | * these pages online first. | |
878 | */ | |
879 | pgs_ol = has->ha_end_pfn - start_pfn; | |
880 | if (pgs_ol > pfn_cnt) | |
881 | pgs_ol = pfn_cnt; | |
d6cbd2c3 | 882 | |
cb7a5724 VK |
883 | has->covered_end_pfn += pgs_ol; |
884 | pfn_cnt -= pgs_ol; | |
d6cbd2c3 VK |
885 | /* |
886 | * Check if the corresponding memory block is already | |
da8ced36 VK |
887 | * online. It is possible to observe struct pages still |
888 | * being uninitialized here so check section instead. | |
889 | * In case the section is online we need to bring the | |
890 | * rest of pfns (which were not backed previously) | |
891 | * online too. | |
d6cbd2c3 VK |
892 | */ |
893 | if (start_pfn > has->start_pfn && | |
da8ced36 | 894 | online_section_nr(pfn_to_section_nr(start_pfn))) |
cb7a5724 | 895 | hv_bring_pgs_online(has, start_pfn, pgs_ol); |
d6cbd2c3 | 896 | |
1cac8cd4 S |
897 | } |
898 | ||
899 | if ((has->ha_end_pfn < has->end_pfn) && (pfn_cnt > 0)) { | |
900 | /* | |
901 | * We have some residual hot add range | |
902 | * that needs to be hot added; hot add | |
903 | * it now. Hot add a multiple of | |
904 | * of HA_CHUNK that fully covers the pages | |
905 | * we have. | |
906 | */ | |
907 | size = (has->end_pfn - has->ha_end_pfn); | |
908 | if (pfn_cnt <= size) { | |
909 | size = ((pfn_cnt / HA_CHUNK) * HA_CHUNK); | |
910 | if (pfn_cnt % HA_CHUNK) | |
911 | size += HA_CHUNK; | |
912 | } else { | |
913 | pfn_cnt = size; | |
914 | } | |
eece30b9 | 915 | spin_unlock_irqrestore(&dm_device.ha_lock, flags); |
1cac8cd4 | 916 | hv_mem_hot_add(has->ha_end_pfn, size, pfn_cnt, has); |
eece30b9 | 917 | spin_lock_irqsave(&dm_device.ha_lock, flags); |
1cac8cd4 S |
918 | } |
919 | /* | |
920 | * If we managed to online any pages that were given to us, | |
921 | * we declare success. | |
922 | */ | |
eece30b9 VK |
923 | res = has->covered_end_pfn - old_covered_state; |
924 | break; | |
1cac8cd4 | 925 | } |
eece30b9 | 926 | spin_unlock_irqrestore(&dm_device.ha_lock, flags); |
1cac8cd4 | 927 | |
eece30b9 | 928 | return res; |
1cac8cd4 S |
929 | } |
930 | ||
931 | static unsigned long process_hot_add(unsigned long pg_start, | |
932 | unsigned long pfn_cnt, | |
933 | unsigned long rg_start, | |
934 | unsigned long rg_size) | |
935 | { | |
936 | struct hv_hotadd_state *ha_region = NULL; | |
cb7a5724 | 937 | int covered; |
eece30b9 | 938 | unsigned long flags; |
1cac8cd4 S |
939 | |
940 | if (pfn_cnt == 0) | |
941 | return 0; | |
942 | ||
cb7a5724 VK |
943 | if (!dm_device.host_specified_ha_region) { |
944 | covered = pfn_covered(pg_start, pfn_cnt); | |
945 | if (covered < 0) | |
946 | return 0; | |
947 | ||
948 | if (covered) | |
1cac8cd4 | 949 | goto do_pg_range; |
cb7a5724 | 950 | } |
1cac8cd4 S |
951 | |
952 | /* | |
953 | * If the host has specified a hot-add range; deal with it first. | |
954 | */ | |
955 | ||
647965a2 | 956 | if (rg_size != 0) { |
1cac8cd4 S |
957 | ha_region = kzalloc(sizeof(struct hv_hotadd_state), GFP_KERNEL); |
958 | if (!ha_region) | |
959 | return 0; | |
960 | ||
961 | INIT_LIST_HEAD(&ha_region->list); | |
cb7a5724 | 962 | INIT_LIST_HEAD(&ha_region->gap_list); |
1cac8cd4 | 963 | |
1cac8cd4 S |
964 | ha_region->start_pfn = rg_start; |
965 | ha_region->ha_end_pfn = rg_start; | |
7cf3b79e | 966 | ha_region->covered_start_pfn = pg_start; |
1cac8cd4 S |
967 | ha_region->covered_end_pfn = pg_start; |
968 | ha_region->end_pfn = rg_start + rg_size; | |
eece30b9 VK |
969 | |
970 | spin_lock_irqsave(&dm_device.ha_lock, flags); | |
971 | list_add_tail(&ha_region->list, &dm_device.ha_region_list); | |
972 | spin_unlock_irqrestore(&dm_device.ha_lock, flags); | |
1cac8cd4 S |
973 | } |
974 | ||
975 | do_pg_range: | |
976 | /* | |
977 | * Process the page range specified; bringing them | |
978 | * online if possible. | |
979 | */ | |
980 | return handle_pg_range(pg_start, pfn_cnt); | |
981 | } | |
982 | ||
983 | #endif | |
984 | ||
985 | static void hot_add_req(struct work_struct *dummy) | |
986 | { | |
987 | struct dm_hot_add_response resp; | |
988 | #ifdef CONFIG_MEMORY_HOTPLUG | |
989 | unsigned long pg_start, pfn_cnt; | |
990 | unsigned long rg_start, rg_sz; | |
991 | #endif | |
992 | struct hv_dynmem_device *dm = &dm_device; | |
993 | ||
9aa8b50b S |
994 | memset(&resp, 0, sizeof(struct dm_hot_add_response)); |
995 | resp.hdr.type = DM_MEM_HOT_ADD_RESPONSE; | |
996 | resp.hdr.size = sizeof(struct dm_hot_add_response); | |
9aa8b50b | 997 | |
1cac8cd4 S |
998 | #ifdef CONFIG_MEMORY_HOTPLUG |
999 | pg_start = dm->ha_wrk.ha_page_range.finfo.start_page; | |
1000 | pfn_cnt = dm->ha_wrk.ha_page_range.finfo.page_cnt; | |
9aa8b50b | 1001 | |
1cac8cd4 S |
1002 | rg_start = dm->ha_wrk.ha_region_range.finfo.start_page; |
1003 | rg_sz = dm->ha_wrk.ha_region_range.finfo.page_cnt; | |
1004 | ||
1005 | if ((rg_start == 0) && (!dm->host_specified_ha_region)) { | |
1006 | unsigned long region_size; | |
1007 | unsigned long region_start; | |
1008 | ||
1009 | /* | |
1010 | * The host has not specified the hot-add region. | |
1011 | * Based on the hot-add page range being specified, | |
1012 | * compute a hot-add region that can cover the pages | |
1013 | * that need to be hot-added while ensuring the alignment | |
1014 | * and size requirements of Linux as it relates to hot-add. | |
1015 | */ | |
1016 | region_start = pg_start; | |
1017 | region_size = (pfn_cnt / HA_CHUNK) * HA_CHUNK; | |
1018 | if (pfn_cnt % HA_CHUNK) | |
1019 | region_size += HA_CHUNK; | |
1020 | ||
1021 | region_start = (pg_start / HA_CHUNK) * HA_CHUNK; | |
1022 | ||
1023 | rg_start = region_start; | |
1024 | rg_sz = region_size; | |
1025 | } | |
1026 | ||
7f4f2302 S |
1027 | if (do_hot_add) |
1028 | resp.page_count = process_hot_add(pg_start, pfn_cnt, | |
1029 | rg_start, rg_sz); | |
549fd280 VK |
1030 | |
1031 | dm->num_pages_added += resp.page_count; | |
1cac8cd4 | 1032 | #endif |
7f4f2302 S |
1033 | /* |
1034 | * The result field of the response structure has the | |
1035 | * following semantics: | |
1036 | * | |
1037 | * 1. If all or some pages hot-added: Guest should return success. | |
1038 | * | |
1039 | * 2. If no pages could be hot-added: | |
1040 | * | |
1041 | * If the guest returns success, then the host | |
1042 | * will not attempt any further hot-add operations. This | |
1043 | * signifies a permanent failure. | |
1044 | * | |
1045 | * If the guest returns failure, then this failure will be | |
1046 | * treated as a transient failure and the host may retry the | |
1047 | * hot-add operation after some delay. | |
1048 | */ | |
1cac8cd4 S |
1049 | if (resp.page_count > 0) |
1050 | resp.result = 1; | |
7f4f2302 S |
1051 | else if (!do_hot_add) |
1052 | resp.result = 1; | |
1cac8cd4 S |
1053 | else |
1054 | resp.result = 0; | |
1055 | ||
1056 | if (!do_hot_add || (resp.page_count == 0)) | |
223e1e4d | 1057 | pr_err("Memory hot add failed\n"); |
1cac8cd4 S |
1058 | |
1059 | dm->state = DM_INITIALIZED; | |
20138d6c | 1060 | resp.hdr.trans_id = atomic_inc_return(&trans_id); |
1cac8cd4 | 1061 | vmbus_sendpacket(dm->dev->channel, &resp, |
9aa8b50b S |
1062 | sizeof(struct dm_hot_add_response), |
1063 | (unsigned long)NULL, | |
1064 | VM_PKT_DATA_INBAND, 0); | |
9aa8b50b S |
1065 | } |
1066 | ||
1067 | static void process_info(struct hv_dynmem_device *dm, struct dm_info_msg *msg) | |
1068 | { | |
6427a0d7 S |
1069 | struct dm_info_header *info_hdr; |
1070 | ||
1071 | info_hdr = (struct dm_info_header *)msg->info; | |
1072 | ||
1073 | switch (info_hdr->type) { | |
9aa8b50b | 1074 | case INFO_TYPE_MAX_PAGE_CNT: |
85000960 AN |
1075 | if (info_hdr->data_size == sizeof(__u64)) { |
1076 | __u64 *max_page_count = (__u64 *)&info_hdr[1]; | |
1077 | ||
7b6e54b5 AN |
1078 | pr_info("Max. dynamic memory size: %llu MB\n", |
1079 | (*max_page_count) >> (20 - PAGE_SHIFT)); | |
85000960 AN |
1080 | } |
1081 | ||
9aa8b50b S |
1082 | break; |
1083 | default: | |
223e1e4d | 1084 | pr_warn("Received Unknown type: %d\n", info_hdr->type); |
9aa8b50b S |
1085 | } |
1086 | } | |
1087 | ||
a6025a2a | 1088 | static unsigned long compute_balloon_floor(void) |
1c7db96f S |
1089 | { |
1090 | unsigned long min_pages; | |
ca79b0c2 | 1091 | unsigned long nr_pages = totalram_pages(); |
1c7db96f S |
1092 | #define MB2PAGES(mb) ((mb) << (20 - PAGE_SHIFT)) |
1093 | /* Simple continuous piecewiese linear function: | |
1094 | * max MiB -> min MiB gradient | |
1095 | * 0 0 | |
1096 | * 16 16 | |
1097 | * 32 24 | |
1098 | * 128 72 (1/2) | |
1099 | * 512 168 (1/4) | |
1100 | * 2048 360 (1/8) | |
7fb0e1a6 VK |
1101 | * 8192 744 (1/16) |
1102 | * 32768 1512 (1/32) | |
1c7db96f | 1103 | */ |
3d6357de AK |
1104 | if (nr_pages < MB2PAGES(128)) |
1105 | min_pages = MB2PAGES(8) + (nr_pages >> 1); | |
1106 | else if (nr_pages < MB2PAGES(512)) | |
1107 | min_pages = MB2PAGES(40) + (nr_pages >> 2); | |
1108 | else if (nr_pages < MB2PAGES(2048)) | |
1109 | min_pages = MB2PAGES(104) + (nr_pages >> 3); | |
1110 | else if (nr_pages < MB2PAGES(8192)) | |
1111 | min_pages = MB2PAGES(232) + (nr_pages >> 4); | |
1c7db96f | 1112 | else |
3d6357de | 1113 | min_pages = MB2PAGES(488) + (nr_pages >> 5); |
1c7db96f S |
1114 | #undef MB2PAGES |
1115 | return min_pages; | |
1116 | } | |
1117 | ||
9aa8b50b S |
1118 | /* |
1119 | * Post our status as it relates memory pressure to the | |
1120 | * host. Host expects the guests to post this status | |
1121 | * periodically at 1 second intervals. | |
1122 | * | |
1123 | * The metrics specified in this protocol are very Windows | |
1124 | * specific and so we cook up numbers here to convey our memory | |
1125 | * pressure. | |
1126 | */ | |
1127 | ||
1128 | static void post_status(struct hv_dynmem_device *dm) | |
1129 | { | |
1130 | struct dm_status status; | |
ae339336 S |
1131 | unsigned long now = jiffies; |
1132 | unsigned long last_post = last_post_time; | |
9aa8b50b | 1133 | |
e500d158 S |
1134 | if (pressure_report_delay > 0) { |
1135 | --pressure_report_delay; | |
1136 | return; | |
1137 | } | |
ae339336 S |
1138 | |
1139 | if (!time_after(now, (last_post_time + HZ))) | |
1140 | return; | |
1141 | ||
9aa8b50b S |
1142 | memset(&status, 0, sizeof(struct dm_status)); |
1143 | status.hdr.type = DM_STATUS_REPORT; | |
1144 | status.hdr.size = sizeof(struct dm_status); | |
1145 | status.hdr.trans_id = atomic_inc_return(&trans_id); | |
1146 | ||
0731572b | 1147 | /* |
549fd280 VK |
1148 | * The host expects the guest to report free and committed memory. |
1149 | * Furthermore, the host expects the pressure information to include | |
1150 | * the ballooned out pages. For a given amount of memory that we are | |
1151 | * managing we need to compute a floor below which we should not | |
1152 | * balloon. Compute this and add it to the pressure report. | |
1153 | * We also need to report all offline pages (num_pages_added - | |
1154 | * num_pages_onlined) as committed to the host, otherwise it can try | |
1155 | * asking us to balloon them out. | |
0731572b | 1156 | */ |
b605c2d9 | 1157 | status.num_avail = si_mem_available(); |
1c7db96f | 1158 | status.num_committed = vm_memory_committed() + |
549fd280 VK |
1159 | dm->num_pages_ballooned + |
1160 | (dm->num_pages_added > dm->num_pages_onlined ? | |
1161 | dm->num_pages_added - dm->num_pages_onlined : 0) + | |
1162 | compute_balloon_floor(); | |
9aa8b50b | 1163 | |
cf21be91 VK |
1164 | trace_balloon_status(status.num_avail, status.num_committed, |
1165 | vm_memory_committed(), dm->num_pages_ballooned, | |
1166 | dm->num_pages_added, dm->num_pages_onlined); | |
c5e2254f S |
1167 | /* |
1168 | * If our transaction ID is no longer current, just don't | |
1169 | * send the status. This can happen if we were interrupted | |
1170 | * after we picked our transaction ID. | |
1171 | */ | |
1172 | if (status.hdr.trans_id != atomic_read(&trans_id)) | |
1173 | return; | |
1174 | ||
ae339336 S |
1175 | /* |
1176 | * If the last post time that we sampled has changed, | |
1177 | * we have raced, don't post the status. | |
1178 | */ | |
1179 | if (last_post != last_post_time) | |
1180 | return; | |
1181 | ||
1182 | last_post_time = jiffies; | |
9aa8b50b S |
1183 | vmbus_sendpacket(dm->dev->channel, &status, |
1184 | sizeof(struct dm_status), | |
1185 | (unsigned long)NULL, | |
1186 | VM_PKT_DATA_INBAND, 0); | |
1187 | ||
1188 | } | |
1189 | ||
989623c7 | 1190 | static void free_balloon_pages(struct hv_dynmem_device *dm, |
9aa8b50b S |
1191 | union dm_mem_page_range *range_array) |
1192 | { | |
1193 | int num_pages = range_array->finfo.page_cnt; | |
1194 | __u64 start_frame = range_array->finfo.start_page; | |
1195 | struct page *pg; | |
1196 | int i; | |
1197 | ||
1198 | for (i = 0; i < num_pages; i++) { | |
1199 | pg = pfn_to_page(i + start_frame); | |
fae42c4d | 1200 | __ClearPageOffline(pg); |
9aa8b50b S |
1201 | __free_page(pg); |
1202 | dm->num_pages_ballooned--; | |
1203 | } | |
1204 | } | |
1205 | ||
1206 | ||
1207 | ||
797f88c9 VK |
1208 | static unsigned int alloc_balloon_pages(struct hv_dynmem_device *dm, |
1209 | unsigned int num_pages, | |
1210 | struct dm_balloon_response *bl_resp, | |
1211 | int alloc_unit) | |
9aa8b50b | 1212 | { |
fae42c4d | 1213 | unsigned int i, j; |
9aa8b50b S |
1214 | struct page *pg; |
1215 | ||
1216 | if (num_pages < alloc_unit) | |
1217 | return 0; | |
1218 | ||
1219 | for (i = 0; (i * alloc_unit) < num_pages; i++) { | |
1220 | if (bl_resp->hdr.size + sizeof(union dm_mem_page_range) > | |
1221 | PAGE_SIZE) | |
1222 | return i * alloc_unit; | |
1223 | ||
1224 | /* | |
1225 | * We execute this code in a thread context. Furthermore, | |
1226 | * we don't want the kernel to try too hard. | |
1227 | */ | |
1228 | pg = alloc_pages(GFP_HIGHUSER | __GFP_NORETRY | | |
1229 | __GFP_NOMEMALLOC | __GFP_NOWARN, | |
1230 | get_order(alloc_unit << PAGE_SHIFT)); | |
1231 | ||
0a1a86ac | 1232 | if (!pg) |
9aa8b50b | 1233 | return i * alloc_unit; |
9aa8b50b S |
1234 | |
1235 | dm->num_pages_ballooned += alloc_unit; | |
1236 | ||
f766dc1e S |
1237 | /* |
1238 | * If we allocatted 2M pages; split them so we | |
1239 | * can free them in any order we get. | |
1240 | */ | |
1241 | ||
1242 | if (alloc_unit != 1) | |
1243 | split_page(pg, get_order(alloc_unit << PAGE_SHIFT)); | |
1244 | ||
fae42c4d DH |
1245 | /* mark all pages offline */ |
1246 | for (j = 0; j < (1 << get_order(alloc_unit << PAGE_SHIFT)); j++) | |
1247 | __SetPageOffline(pg + j); | |
1248 | ||
9aa8b50b S |
1249 | bl_resp->range_count++; |
1250 | bl_resp->range_array[i].finfo.start_page = | |
1251 | page_to_pfn(pg); | |
1252 | bl_resp->range_array[i].finfo.page_cnt = alloc_unit; | |
1253 | bl_resp->hdr.size += sizeof(union dm_mem_page_range); | |
1254 | ||
1255 | } | |
1256 | ||
1257 | return num_pages; | |
1258 | } | |
1259 | ||
6571b2da | 1260 | static void balloon_up(struct work_struct *dummy) |
9aa8b50b | 1261 | { |
797f88c9 VK |
1262 | unsigned int num_pages = dm_device.balloon_wrk.num_pages; |
1263 | unsigned int num_ballooned = 0; | |
9aa8b50b S |
1264 | struct dm_balloon_response *bl_resp; |
1265 | int alloc_unit; | |
1266 | int ret; | |
9aa8b50b S |
1267 | bool done = false; |
1268 | int i; | |
b605c2d9 | 1269 | long avail_pages; |
530d15b9 | 1270 | unsigned long floor; |
9aa8b50b | 1271 | |
f6712238 DC |
1272 | /* The host balloons pages in 2M granularity. */ |
1273 | WARN_ON_ONCE(num_pages % PAGES_IN_2M != 0); | |
9aa8b50b S |
1274 | |
1275 | /* | |
f766dc1e S |
1276 | * We will attempt 2M allocations. However, if we fail to |
1277 | * allocate 2M chunks, we will go back to 4k allocations. | |
9aa8b50b | 1278 | */ |
f766dc1e | 1279 | alloc_unit = 512; |
9aa8b50b | 1280 | |
b605c2d9 | 1281 | avail_pages = si_mem_available(); |
530d15b9 VK |
1282 | floor = compute_balloon_floor(); |
1283 | ||
1284 | /* Refuse to balloon below the floor, keep the 2M granularity. */ | |
b605c2d9 | 1285 | if (avail_pages < num_pages || avail_pages - num_pages < floor) { |
b3bb97b8 AN |
1286 | pr_warn("Balloon request will be partially fulfilled. %s\n", |
1287 | avail_pages < num_pages ? "Not enough memory." : | |
1288 | "Balloon floor reached."); | |
1289 | ||
b605c2d9 | 1290 | num_pages = avail_pages > floor ? (avail_pages - floor) : 0; |
530d15b9 VK |
1291 | num_pages -= num_pages % PAGES_IN_2M; |
1292 | } | |
1293 | ||
9aa8b50b | 1294 | while (!done) { |
1fed17df DC |
1295 | memset(balloon_up_send_buffer, 0, PAGE_SIZE); |
1296 | bl_resp = (struct dm_balloon_response *)balloon_up_send_buffer; | |
9aa8b50b | 1297 | bl_resp->hdr.type = DM_BALLOON_RESPONSE; |
9aa8b50b S |
1298 | bl_resp->hdr.size = sizeof(struct dm_balloon_response); |
1299 | bl_resp->more_pages = 1; | |
1300 | ||
9aa8b50b | 1301 | num_pages -= num_ballooned; |
6571b2da | 1302 | num_ballooned = alloc_balloon_pages(&dm_device, num_pages, |
0a1a86ac | 1303 | bl_resp, alloc_unit); |
9aa8b50b | 1304 | |
f6712238 | 1305 | if (alloc_unit != 1 && num_ballooned == 0) { |
f766dc1e S |
1306 | alloc_unit = 1; |
1307 | continue; | |
1308 | } | |
1309 | ||
0a1a86ac | 1310 | if (num_ballooned == 0 || num_ballooned == num_pages) { |
b3bb97b8 AN |
1311 | pr_debug("Ballooned %u out of %u requested pages.\n", |
1312 | num_pages, dm_device.balloon_wrk.num_pages); | |
1313 | ||
9aa8b50b S |
1314 | bl_resp->more_pages = 0; |
1315 | done = true; | |
6571b2da | 1316 | dm_device.state = DM_INITIALIZED; |
9aa8b50b S |
1317 | } |
1318 | ||
1319 | /* | |
1320 | * We are pushing a lot of data through the channel; | |
1321 | * deal with transient failures caused because of the | |
1322 | * lack of space in the ring buffer. | |
1323 | */ | |
1324 | ||
1325 | do { | |
20138d6c | 1326 | bl_resp->hdr.trans_id = atomic_inc_return(&trans_id); |
9aa8b50b S |
1327 | ret = vmbus_sendpacket(dm_device.dev->channel, |
1328 | bl_resp, | |
1329 | bl_resp->hdr.size, | |
1330 | (unsigned long)NULL, | |
1331 | VM_PKT_DATA_INBAND, 0); | |
1332 | ||
1333 | if (ret == -EAGAIN) | |
1334 | msleep(20); | |
ae339336 | 1335 | post_status(&dm_device); |
9aa8b50b S |
1336 | } while (ret == -EAGAIN); |
1337 | ||
1338 | if (ret) { | |
1339 | /* | |
1340 | * Free up the memory we allocatted. | |
1341 | */ | |
223e1e4d | 1342 | pr_err("Balloon response failed\n"); |
9aa8b50b S |
1343 | |
1344 | for (i = 0; i < bl_resp->range_count; i++) | |
6571b2da | 1345 | free_balloon_pages(&dm_device, |
9aa8b50b S |
1346 | &bl_resp->range_array[i]); |
1347 | ||
1348 | done = true; | |
1349 | } | |
1350 | } | |
1351 | ||
1352 | } | |
1353 | ||
1354 | static void balloon_down(struct hv_dynmem_device *dm, | |
1355 | struct dm_unballoon_request *req) | |
1356 | { | |
1357 | union dm_mem_page_range *range_array = req->range_array; | |
1358 | int range_count = req->range_count; | |
1359 | struct dm_unballoon_response resp; | |
1360 | int i; | |
b3bb97b8 | 1361 | unsigned int prev_pages_ballooned = dm->num_pages_ballooned; |
9aa8b50b | 1362 | |
ae339336 | 1363 | for (i = 0; i < range_count; i++) { |
9aa8b50b | 1364 | free_balloon_pages(dm, &range_array[i]); |
ab3de22b | 1365 | complete(&dm_device.config_event); |
ae339336 | 1366 | } |
9aa8b50b | 1367 | |
b3bb97b8 AN |
1368 | pr_debug("Freed %u ballooned pages.\n", |
1369 | prev_pages_ballooned - dm->num_pages_ballooned); | |
1370 | ||
9aa8b50b S |
1371 | if (req->more_pages == 1) |
1372 | return; | |
1373 | ||
1374 | memset(&resp, 0, sizeof(struct dm_unballoon_response)); | |
1375 | resp.hdr.type = DM_UNBALLOON_RESPONSE; | |
1376 | resp.hdr.trans_id = atomic_inc_return(&trans_id); | |
1377 | resp.hdr.size = sizeof(struct dm_unballoon_response); | |
1378 | ||
1379 | vmbus_sendpacket(dm_device.dev->channel, &resp, | |
1380 | sizeof(struct dm_unballoon_response), | |
1381 | (unsigned long)NULL, | |
1382 | VM_PKT_DATA_INBAND, 0); | |
1383 | ||
1384 | dm->state = DM_INITIALIZED; | |
1385 | } | |
1386 | ||
1387 | static void balloon_onchannelcallback(void *context); | |
1388 | ||
1389 | static int dm_thread_func(void *dm_dev) | |
1390 | { | |
1391 | struct hv_dynmem_device *dm = dm_dev; | |
9aa8b50b S |
1392 | |
1393 | while (!kthread_should_stop()) { | |
ab3de22b | 1394 | wait_for_completion_interruptible_timeout( |
5dba4c56 | 1395 | &dm_device.config_event, 1*HZ); |
9aa8b50b S |
1396 | /* |
1397 | * The host expects us to post information on the memory | |
1398 | * pressure every second. | |
1399 | */ | |
ab3de22b S |
1400 | reinit_completion(&dm_device.config_event); |
1401 | post_status(dm); | |
9aa8b50b S |
1402 | } |
1403 | ||
1404 | return 0; | |
1405 | } | |
1406 | ||
1407 | ||
1408 | static void version_resp(struct hv_dynmem_device *dm, | |
1409 | struct dm_version_response *vresp) | |
1410 | { | |
1411 | struct dm_version_request version_req; | |
1412 | int ret; | |
1413 | ||
1414 | if (vresp->is_accepted) { | |
1415 | /* | |
1416 | * We are done; wakeup the | |
1417 | * context waiting for version | |
1418 | * negotiation. | |
1419 | */ | |
1420 | complete(&dm->host_event); | |
1421 | return; | |
1422 | } | |
1423 | /* | |
1424 | * If there are more versions to try, continue | |
1425 | * with negotiations; if not | |
1426 | * shutdown the service since we are not able | |
1427 | * to negotiate a suitable version number | |
1428 | * with the host. | |
1429 | */ | |
1430 | if (dm->next_version == 0) | |
1431 | goto version_error; | |
1432 | ||
9aa8b50b S |
1433 | memset(&version_req, 0, sizeof(struct dm_version_request)); |
1434 | version_req.hdr.type = DM_VERSION_REQUEST; | |
1435 | version_req.hdr.size = sizeof(struct dm_version_request); | |
1436 | version_req.hdr.trans_id = atomic_inc_return(&trans_id); | |
b6ddeae1 | 1437 | version_req.version.version = dm->next_version; |
b3bb97b8 | 1438 | dm->version = version_req.version.version; |
b6ddeae1 AN |
1439 | |
1440 | /* | |
1441 | * Set the next version to try in case current version fails. | |
1442 | * Win7 protocol ought to be the last one to try. | |
1443 | */ | |
1444 | switch (version_req.version.version) { | |
1445 | case DYNMEM_PROTOCOL_VERSION_WIN8: | |
1446 | dm->next_version = DYNMEM_PROTOCOL_VERSION_WIN7; | |
1447 | version_req.is_last_attempt = 0; | |
1448 | break; | |
1449 | default: | |
1450 | dm->next_version = 0; | |
1451 | version_req.is_last_attempt = 1; | |
1452 | } | |
9aa8b50b S |
1453 | |
1454 | ret = vmbus_sendpacket(dm->dev->channel, &version_req, | |
1455 | sizeof(struct dm_version_request), | |
1456 | (unsigned long)NULL, | |
1457 | VM_PKT_DATA_INBAND, 0); | |
1458 | ||
1459 | if (ret) | |
1460 | goto version_error; | |
1461 | ||
1462 | return; | |
1463 | ||
1464 | version_error: | |
1465 | dm->state = DM_INIT_ERROR; | |
1466 | complete(&dm->host_event); | |
1467 | } | |
1468 | ||
1469 | static void cap_resp(struct hv_dynmem_device *dm, | |
1470 | struct dm_capabilities_resp_msg *cap_resp) | |
1471 | { | |
1472 | if (!cap_resp->is_accepted) { | |
223e1e4d | 1473 | pr_err("Capabilities not accepted by host\n"); |
9aa8b50b S |
1474 | dm->state = DM_INIT_ERROR; |
1475 | } | |
1476 | complete(&dm->host_event); | |
1477 | } | |
1478 | ||
1479 | static void balloon_onchannelcallback(void *context) | |
1480 | { | |
1481 | struct hv_device *dev = context; | |
1482 | u32 recvlen; | |
1483 | u64 requestid; | |
1484 | struct dm_message *dm_msg; | |
1485 | struct dm_header *dm_hdr; | |
1486 | struct hv_dynmem_device *dm = hv_get_drvdata(dev); | |
6571b2da | 1487 | struct dm_balloon *bal_msg; |
c51af826 S |
1488 | struct dm_hot_add *ha_msg; |
1489 | union dm_mem_page_range *ha_pg_range; | |
1cac8cd4 | 1490 | union dm_mem_page_range *ha_region; |
9aa8b50b S |
1491 | |
1492 | memset(recv_buffer, 0, sizeof(recv_buffer)); | |
1493 | vmbus_recvpacket(dev->channel, recv_buffer, | |
1494 | PAGE_SIZE, &recvlen, &requestid); | |
1495 | ||
1496 | if (recvlen > 0) { | |
1497 | dm_msg = (struct dm_message *)recv_buffer; | |
1498 | dm_hdr = &dm_msg->hdr; | |
1499 | ||
1500 | switch (dm_hdr->type) { | |
1501 | case DM_VERSION_RESPONSE: | |
1502 | version_resp(dm, | |
1503 | (struct dm_version_response *)dm_msg); | |
1504 | break; | |
1505 | ||
1506 | case DM_CAPABILITIES_RESPONSE: | |
1507 | cap_resp(dm, | |
1508 | (struct dm_capabilities_resp_msg *)dm_msg); | |
1509 | break; | |
1510 | ||
1511 | case DM_BALLOON_REQUEST: | |
6571b2da S |
1512 | if (dm->state == DM_BALLOON_UP) |
1513 | pr_warn("Currently ballooning\n"); | |
1514 | bal_msg = (struct dm_balloon *)recv_buffer; | |
9aa8b50b | 1515 | dm->state = DM_BALLOON_UP; |
6571b2da S |
1516 | dm_device.balloon_wrk.num_pages = bal_msg->num_pages; |
1517 | schedule_work(&dm_device.balloon_wrk.wrk); | |
9aa8b50b S |
1518 | break; |
1519 | ||
1520 | case DM_UNBALLOON_REQUEST: | |
1521 | dm->state = DM_BALLOON_DOWN; | |
1522 | balloon_down(dm, | |
1523 | (struct dm_unballoon_request *)recv_buffer); | |
1524 | break; | |
1525 | ||
1526 | case DM_MEM_HOT_ADD_REQUEST: | |
c51af826 S |
1527 | if (dm->state == DM_HOT_ADD) |
1528 | pr_warn("Currently hot-adding\n"); | |
9aa8b50b | 1529 | dm->state = DM_HOT_ADD; |
c51af826 | 1530 | ha_msg = (struct dm_hot_add *)recv_buffer; |
1cac8cd4 S |
1531 | if (ha_msg->hdr.size == sizeof(struct dm_hot_add)) { |
1532 | /* | |
1533 | * This is a normal hot-add request specifying | |
1534 | * hot-add memory. | |
1535 | */ | |
d19a55d6 | 1536 | dm->host_specified_ha_region = false; |
1cac8cd4 S |
1537 | ha_pg_range = &ha_msg->range; |
1538 | dm->ha_wrk.ha_page_range = *ha_pg_range; | |
1539 | dm->ha_wrk.ha_region_range.page_range = 0; | |
1540 | } else { | |
1541 | /* | |
1542 | * Host is specifying that we first hot-add | |
1543 | * a region and then partially populate this | |
1544 | * region. | |
1545 | */ | |
1546 | dm->host_specified_ha_region = true; | |
1547 | ha_pg_range = &ha_msg->range; | |
1548 | ha_region = &ha_pg_range[1]; | |
1549 | dm->ha_wrk.ha_page_range = *ha_pg_range; | |
1550 | dm->ha_wrk.ha_region_range = *ha_region; | |
1551 | } | |
c51af826 | 1552 | schedule_work(&dm_device.ha_wrk.wrk); |
9aa8b50b S |
1553 | break; |
1554 | ||
1555 | case DM_INFO_MESSAGE: | |
1556 | process_info(dm, (struct dm_info_msg *)dm_msg); | |
1557 | break; | |
1558 | ||
1559 | default: | |
223e1e4d | 1560 | pr_warn("Unhandled message: type: %d\n", dm_hdr->type); |
9aa8b50b S |
1561 | |
1562 | } | |
1563 | } | |
1564 | ||
1565 | } | |
1566 | ||
221f6df0 | 1567 | static int balloon_connect_vsp(struct hv_device *dev) |
9aa8b50b | 1568 | { |
9aa8b50b S |
1569 | struct dm_version_request version_req; |
1570 | struct dm_capabilities cap_msg; | |
221f6df0 DC |
1571 | unsigned long t; |
1572 | int ret; | |
9aa8b50b | 1573 | |
9aa8b50b | 1574 | ret = vmbus_open(dev->channel, dm_ring_size, dm_ring_size, NULL, 0, |
221f6df0 | 1575 | balloon_onchannelcallback, dev); |
9aa8b50b | 1576 | if (ret) |
1fed17df | 1577 | return ret; |
9aa8b50b | 1578 | |
9aa8b50b S |
1579 | /* |
1580 | * Initiate the hand shake with the host and negotiate | |
1581 | * a version that the host can support. We start with the | |
1582 | * highest version number and go down if the host cannot | |
1583 | * support it. | |
1584 | */ | |
1585 | memset(&version_req, 0, sizeof(struct dm_version_request)); | |
1586 | version_req.hdr.type = DM_VERSION_REQUEST; | |
1587 | version_req.hdr.size = sizeof(struct dm_version_request); | |
1588 | version_req.hdr.trans_id = atomic_inc_return(&trans_id); | |
b6ddeae1 | 1589 | version_req.version.version = DYNMEM_PROTOCOL_VERSION_WIN10; |
9aa8b50b | 1590 | version_req.is_last_attempt = 0; |
b3bb97b8 | 1591 | dm_device.version = version_req.version.version; |
9aa8b50b S |
1592 | |
1593 | ret = vmbus_sendpacket(dev->channel, &version_req, | |
221f6df0 DC |
1594 | sizeof(struct dm_version_request), |
1595 | (unsigned long)NULL, VM_PKT_DATA_INBAND, 0); | |
9aa8b50b | 1596 | if (ret) |
221f6df0 | 1597 | goto out; |
9aa8b50b S |
1598 | |
1599 | t = wait_for_completion_timeout(&dm_device.host_event, 5*HZ); | |
1600 | if (t == 0) { | |
1601 | ret = -ETIMEDOUT; | |
221f6df0 | 1602 | goto out; |
9aa8b50b S |
1603 | } |
1604 | ||
1605 | /* | |
1606 | * If we could not negotiate a compatible version with the host | |
1607 | * fail the probe function. | |
1608 | */ | |
1609 | if (dm_device.state == DM_INIT_ERROR) { | |
221f6df0 DC |
1610 | ret = -EPROTO; |
1611 | goto out; | |
9aa8b50b | 1612 | } |
b3bb97b8 AN |
1613 | |
1614 | pr_info("Using Dynamic Memory protocol version %u.%u\n", | |
1615 | DYNMEM_MAJOR_VERSION(dm_device.version), | |
1616 | DYNMEM_MINOR_VERSION(dm_device.version)); | |
1617 | ||
9aa8b50b S |
1618 | /* |
1619 | * Now submit our capabilities to the host. | |
1620 | */ | |
1621 | memset(&cap_msg, 0, sizeof(struct dm_capabilities)); | |
1622 | cap_msg.hdr.type = DM_CAPABILITIES_REPORT; | |
1623 | cap_msg.hdr.size = sizeof(struct dm_capabilities); | |
1624 | cap_msg.hdr.trans_id = atomic_inc_return(&trans_id); | |
1625 | ||
1626 | cap_msg.caps.cap_bits.balloon = 1; | |
9aa8b50b S |
1627 | cap_msg.caps.cap_bits.hot_add = 1; |
1628 | ||
647965a2 S |
1629 | /* |
1630 | * Specify our alignment requirements as it relates | |
1631 | * memory hot-add. Specify 128MB alignment. | |
1632 | */ | |
1633 | cap_msg.caps.cap_bits.hot_add_alignment = 7; | |
1634 | ||
9aa8b50b S |
1635 | /* |
1636 | * Currently the host does not use these | |
1637 | * values and we set them to what is done in the | |
1638 | * Windows driver. | |
1639 | */ | |
1640 | cap_msg.min_page_cnt = 0; | |
1641 | cap_msg.max_page_number = -1; | |
1642 | ||
1643 | ret = vmbus_sendpacket(dev->channel, &cap_msg, | |
221f6df0 DC |
1644 | sizeof(struct dm_capabilities), |
1645 | (unsigned long)NULL, VM_PKT_DATA_INBAND, 0); | |
9aa8b50b | 1646 | if (ret) |
221f6df0 | 1647 | goto out; |
9aa8b50b S |
1648 | |
1649 | t = wait_for_completion_timeout(&dm_device.host_event, 5*HZ); | |
1650 | if (t == 0) { | |
1651 | ret = -ETIMEDOUT; | |
221f6df0 | 1652 | goto out; |
9aa8b50b S |
1653 | } |
1654 | ||
1655 | /* | |
1656 | * If the host does not like our capabilities, | |
1657 | * fail the probe function. | |
1658 | */ | |
1659 | if (dm_device.state == DM_INIT_ERROR) { | |
221f6df0 DC |
1660 | ret = -EPROTO; |
1661 | goto out; | |
9aa8b50b S |
1662 | } |
1663 | ||
221f6df0 DC |
1664 | return 0; |
1665 | out: | |
1666 | vmbus_close(dev->channel); | |
1667 | return ret; | |
1668 | } | |
1669 | ||
1670 | static int balloon_probe(struct hv_device *dev, | |
1671 | const struct hv_vmbus_device_id *dev_id) | |
1672 | { | |
1673 | int ret; | |
1674 | ||
1675 | #ifdef CONFIG_MEMORY_HOTPLUG | |
1676 | do_hot_add = hot_add; | |
1677 | #else | |
1678 | do_hot_add = false; | |
1679 | #endif | |
1680 | dm_device.dev = dev; | |
1681 | dm_device.state = DM_INITIALIZING; | |
1682 | dm_device.next_version = DYNMEM_PROTOCOL_VERSION_WIN8; | |
1683 | init_completion(&dm_device.host_event); | |
1684 | init_completion(&dm_device.config_event); | |
1685 | INIT_LIST_HEAD(&dm_device.ha_region_list); | |
1686 | spin_lock_init(&dm_device.ha_lock); | |
1687 | INIT_WORK(&dm_device.balloon_wrk.wrk, balloon_up); | |
1688 | INIT_WORK(&dm_device.ha_wrk.wrk, hot_add_req); | |
1689 | dm_device.host_specified_ha_region = false; | |
1690 | ||
1691 | #ifdef CONFIG_MEMORY_HOTPLUG | |
1692 | set_online_page_callback(&hv_online_page); | |
1693 | register_memory_notifier(&hv_memory_nb); | |
1694 | #endif | |
1695 | ||
1696 | hv_set_drvdata(dev, &dm_device); | |
1697 | ||
1698 | ret = balloon_connect_vsp(dev); | |
1699 | if (ret != 0) | |
1700 | return ret; | |
1701 | ||
9aa8b50b | 1702 | dm_device.state = DM_INITIALIZED; |
221f6df0 DC |
1703 | |
1704 | dm_device.thread = | |
1705 | kthread_run(dm_thread_func, &dm_device, "hv_balloon"); | |
1706 | if (IS_ERR(dm_device.thread)) { | |
1707 | ret = PTR_ERR(dm_device.thread); | |
1708 | goto probe_error; | |
1709 | } | |
9aa8b50b S |
1710 | |
1711 | return 0; | |
1712 | ||
221f6df0 DC |
1713 | probe_error: |
1714 | vmbus_close(dev->channel); | |
1cac8cd4 | 1715 | #ifdef CONFIG_MEMORY_HOTPLUG |
221f6df0 | 1716 | unregister_memory_notifier(&hv_memory_nb); |
1cac8cd4 S |
1717 | restore_online_page_callback(&hv_online_page); |
1718 | #endif | |
9aa8b50b S |
1719 | return ret; |
1720 | } | |
1721 | ||
1722 | static int balloon_remove(struct hv_device *dev) | |
1723 | { | |
1724 | struct hv_dynmem_device *dm = hv_get_drvdata(dev); | |
eece30b9 | 1725 | struct hv_hotadd_state *has, *tmp; |
cb7a5724 | 1726 | struct hv_hotadd_gap *gap, *tmp_gap; |
eece30b9 | 1727 | unsigned long flags; |
9aa8b50b S |
1728 | |
1729 | if (dm->num_pages_ballooned != 0) | |
1730 | pr_warn("Ballooned pages: %d\n", dm->num_pages_ballooned); | |
1731 | ||
6571b2da | 1732 | cancel_work_sync(&dm->balloon_wrk.wrk); |
c51af826 | 1733 | cancel_work_sync(&dm->ha_wrk.wrk); |
1cac8cd4 | 1734 | |
9aa8b50b | 1735 | kthread_stop(dm->thread); |
221f6df0 | 1736 | vmbus_close(dev->channel); |
1cac8cd4 | 1737 | #ifdef CONFIG_MEMORY_HOTPLUG |
22f88475 | 1738 | unregister_memory_notifier(&hv_memory_nb); |
221f6df0 | 1739 | restore_online_page_callback(&hv_online_page); |
1cac8cd4 | 1740 | #endif |
eece30b9 VK |
1741 | spin_lock_irqsave(&dm_device.ha_lock, flags); |
1742 | list_for_each_entry_safe(has, tmp, &dm->ha_region_list, list) { | |
cb7a5724 VK |
1743 | list_for_each_entry_safe(gap, tmp_gap, &has->gap_list, list) { |
1744 | list_del(&gap->list); | |
1745 | kfree(gap); | |
1746 | } | |
1cac8cd4 S |
1747 | list_del(&has->list); |
1748 | kfree(has); | |
1749 | } | |
eece30b9 | 1750 | spin_unlock_irqrestore(&dm_device.ha_lock, flags); |
9aa8b50b S |
1751 | |
1752 | return 0; | |
1753 | } | |
1754 | ||
1755 | static const struct hv_vmbus_device_id id_table[] = { | |
1756 | /* Dynamic Memory Class ID */ | |
1757 | /* 525074DC-8985-46e2-8057-A307DC18A502 */ | |
d13984e5 | 1758 | { HV_DM_GUID, }, |
9aa8b50b S |
1759 | { }, |
1760 | }; | |
1761 | ||
1762 | MODULE_DEVICE_TABLE(vmbus, id_table); | |
1763 | ||
1764 | static struct hv_driver balloon_drv = { | |
1765 | .name = "hv_balloon", | |
1766 | .id_table = id_table, | |
1767 | .probe = balloon_probe, | |
1768 | .remove = balloon_remove, | |
af0a5646 AV |
1769 | .driver = { |
1770 | .probe_type = PROBE_PREFER_ASYNCHRONOUS, | |
1771 | }, | |
9aa8b50b S |
1772 | }; |
1773 | ||
1774 | static int __init init_balloon_drv(void) | |
1775 | { | |
1776 | ||
1777 | return vmbus_driver_register(&balloon_drv); | |
1778 | } | |
1779 | ||
9aa8b50b | 1780 | module_init(init_balloon_drv); |
9aa8b50b S |
1781 | |
1782 | MODULE_DESCRIPTION("Hyper-V Balloon"); | |
9aa8b50b | 1783 | MODULE_LICENSE("GPL"); |