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9aa8b50b S |
1 | /* |
2 | * Copyright (c) 2012, Microsoft Corporation. | |
3 | * | |
4 | * Author: | |
5 | * K. Y. Srinivasan <kys@microsoft.com> | |
6 | * | |
7 | * This program is free software; you can redistribute it and/or modify it | |
8 | * under the terms of the GNU General Public License version 2 as published | |
9 | * by the Free Software Foundation. | |
10 | * | |
11 | * This program is distributed in the hope that it will be useful, but | |
12 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or | |
14 | * NON INFRINGEMENT. See the GNU General Public License for more | |
15 | * details. | |
16 | * | |
17 | */ | |
18 | ||
19 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt | |
20 | ||
21 | #include <linux/kernel.h> | |
ae339336 | 22 | #include <linux/jiffies.h> |
9aa8b50b S |
23 | #include <linux/mman.h> |
24 | #include <linux/delay.h> | |
25 | #include <linux/init.h> | |
26 | #include <linux/module.h> | |
27 | #include <linux/slab.h> | |
28 | #include <linux/kthread.h> | |
29 | #include <linux/completion.h> | |
30 | #include <linux/memory_hotplug.h> | |
31 | #include <linux/memory.h> | |
32 | #include <linux/notifier.h> | |
9aa8b50b S |
33 | #include <linux/percpu_counter.h> |
34 | ||
35 | #include <linux/hyperv.h> | |
36 | ||
37 | /* | |
38 | * We begin with definitions supporting the Dynamic Memory protocol | |
39 | * with the host. | |
40 | * | |
41 | * Begin protocol definitions. | |
42 | */ | |
43 | ||
44 | ||
45 | ||
46 | /* | |
47 | * Protocol versions. The low word is the minor version, the high word the major | |
48 | * version. | |
49 | * | |
50 | * History: | |
51 | * Initial version 1.0 | |
52 | * Changed to 0.1 on 2009/03/25 | |
53 | * Changes to 0.2 on 2009/05/14 | |
54 | * Changes to 0.3 on 2009/12/03 | |
55 | * Changed to 1.0 on 2011/04/05 | |
56 | */ | |
57 | ||
58 | #define DYNMEM_MAKE_VERSION(Major, Minor) ((__u32)(((Major) << 16) | (Minor))) | |
59 | #define DYNMEM_MAJOR_VERSION(Version) ((__u32)(Version) >> 16) | |
60 | #define DYNMEM_MINOR_VERSION(Version) ((__u32)(Version) & 0xff) | |
61 | ||
62 | enum { | |
63 | DYNMEM_PROTOCOL_VERSION_1 = DYNMEM_MAKE_VERSION(0, 3), | |
64 | DYNMEM_PROTOCOL_VERSION_2 = DYNMEM_MAKE_VERSION(1, 0), | |
b6ddeae1 | 65 | DYNMEM_PROTOCOL_VERSION_3 = DYNMEM_MAKE_VERSION(2, 0), |
9aa8b50b S |
66 | |
67 | DYNMEM_PROTOCOL_VERSION_WIN7 = DYNMEM_PROTOCOL_VERSION_1, | |
68 | DYNMEM_PROTOCOL_VERSION_WIN8 = DYNMEM_PROTOCOL_VERSION_2, | |
b6ddeae1 | 69 | DYNMEM_PROTOCOL_VERSION_WIN10 = DYNMEM_PROTOCOL_VERSION_3, |
9aa8b50b | 70 | |
b6ddeae1 | 71 | DYNMEM_PROTOCOL_VERSION_CURRENT = DYNMEM_PROTOCOL_VERSION_WIN10 |
9aa8b50b S |
72 | }; |
73 | ||
74 | ||
75 | ||
76 | /* | |
77 | * Message Types | |
78 | */ | |
79 | ||
80 | enum dm_message_type { | |
81 | /* | |
82 | * Version 0.3 | |
83 | */ | |
84 | DM_ERROR = 0, | |
85 | DM_VERSION_REQUEST = 1, | |
86 | DM_VERSION_RESPONSE = 2, | |
87 | DM_CAPABILITIES_REPORT = 3, | |
88 | DM_CAPABILITIES_RESPONSE = 4, | |
89 | DM_STATUS_REPORT = 5, | |
90 | DM_BALLOON_REQUEST = 6, | |
91 | DM_BALLOON_RESPONSE = 7, | |
92 | DM_UNBALLOON_REQUEST = 8, | |
93 | DM_UNBALLOON_RESPONSE = 9, | |
94 | DM_MEM_HOT_ADD_REQUEST = 10, | |
95 | DM_MEM_HOT_ADD_RESPONSE = 11, | |
96 | DM_VERSION_03_MAX = 11, | |
97 | /* | |
98 | * Version 1.0. | |
99 | */ | |
100 | DM_INFO_MESSAGE = 12, | |
101 | DM_VERSION_1_MAX = 12 | |
102 | }; | |
103 | ||
104 | ||
105 | /* | |
106 | * Structures defining the dynamic memory management | |
107 | * protocol. | |
108 | */ | |
109 | ||
110 | union dm_version { | |
111 | struct { | |
112 | __u16 minor_version; | |
113 | __u16 major_version; | |
114 | }; | |
115 | __u32 version; | |
116 | } __packed; | |
117 | ||
118 | ||
119 | union dm_caps { | |
120 | struct { | |
121 | __u64 balloon:1; | |
122 | __u64 hot_add:1; | |
647965a2 S |
123 | /* |
124 | * To support guests that may have alignment | |
125 | * limitations on hot-add, the guest can specify | |
126 | * its alignment requirements; a value of n | |
127 | * represents an alignment of 2^n in mega bytes. | |
128 | */ | |
129 | __u64 hot_add_alignment:4; | |
130 | __u64 reservedz:58; | |
9aa8b50b S |
131 | } cap_bits; |
132 | __u64 caps; | |
133 | } __packed; | |
134 | ||
135 | union dm_mem_page_range { | |
136 | struct { | |
137 | /* | |
138 | * The PFN number of the first page in the range. | |
139 | * 40 bits is the architectural limit of a PFN | |
140 | * number for AMD64. | |
141 | */ | |
142 | __u64 start_page:40; | |
143 | /* | |
144 | * The number of pages in the range. | |
145 | */ | |
146 | __u64 page_cnt:24; | |
147 | } finfo; | |
148 | __u64 page_range; | |
149 | } __packed; | |
150 | ||
151 | ||
152 | ||
153 | /* | |
154 | * The header for all dynamic memory messages: | |
155 | * | |
156 | * type: Type of the message. | |
157 | * size: Size of the message in bytes; including the header. | |
158 | * trans_id: The guest is responsible for manufacturing this ID. | |
159 | */ | |
160 | ||
161 | struct dm_header { | |
162 | __u16 type; | |
163 | __u16 size; | |
164 | __u32 trans_id; | |
165 | } __packed; | |
166 | ||
167 | /* | |
168 | * A generic message format for dynamic memory. | |
169 | * Specific message formats are defined later in the file. | |
170 | */ | |
171 | ||
172 | struct dm_message { | |
173 | struct dm_header hdr; | |
174 | __u8 data[]; /* enclosed message */ | |
175 | } __packed; | |
176 | ||
177 | ||
178 | /* | |
179 | * Specific message types supporting the dynamic memory protocol. | |
180 | */ | |
181 | ||
182 | /* | |
183 | * Version negotiation message. Sent from the guest to the host. | |
184 | * The guest is free to try different versions until the host | |
185 | * accepts the version. | |
186 | * | |
187 | * dm_version: The protocol version requested. | |
188 | * is_last_attempt: If TRUE, this is the last version guest will request. | |
189 | * reservedz: Reserved field, set to zero. | |
190 | */ | |
191 | ||
192 | struct dm_version_request { | |
193 | struct dm_header hdr; | |
194 | union dm_version version; | |
195 | __u32 is_last_attempt:1; | |
196 | __u32 reservedz:31; | |
197 | } __packed; | |
198 | ||
199 | /* | |
200 | * Version response message; Host to Guest and indicates | |
201 | * if the host has accepted the version sent by the guest. | |
202 | * | |
203 | * is_accepted: If TRUE, host has accepted the version and the guest | |
204 | * should proceed to the next stage of the protocol. FALSE indicates that | |
205 | * guest should re-try with a different version. | |
206 | * | |
207 | * reservedz: Reserved field, set to zero. | |
208 | */ | |
209 | ||
210 | struct dm_version_response { | |
211 | struct dm_header hdr; | |
212 | __u64 is_accepted:1; | |
213 | __u64 reservedz:63; | |
214 | } __packed; | |
215 | ||
216 | /* | |
217 | * Message reporting capabilities. This is sent from the guest to the | |
218 | * host. | |
219 | */ | |
220 | ||
221 | struct dm_capabilities { | |
222 | struct dm_header hdr; | |
223 | union dm_caps caps; | |
224 | __u64 min_page_cnt; | |
225 | __u64 max_page_number; | |
226 | } __packed; | |
227 | ||
228 | /* | |
229 | * Response to the capabilities message. This is sent from the host to the | |
230 | * guest. This message notifies if the host has accepted the guest's | |
231 | * capabilities. If the host has not accepted, the guest must shutdown | |
232 | * the service. | |
233 | * | |
234 | * is_accepted: Indicates if the host has accepted guest's capabilities. | |
235 | * reservedz: Must be 0. | |
236 | */ | |
237 | ||
238 | struct dm_capabilities_resp_msg { | |
239 | struct dm_header hdr; | |
240 | __u64 is_accepted:1; | |
241 | __u64 reservedz:63; | |
242 | } __packed; | |
243 | ||
244 | /* | |
245 | * This message is used to report memory pressure from the guest. | |
246 | * This message is not part of any transaction and there is no | |
247 | * response to this message. | |
248 | * | |
249 | * num_avail: Available memory in pages. | |
250 | * num_committed: Committed memory in pages. | |
251 | * page_file_size: The accumulated size of all page files | |
252 | * in the system in pages. | |
253 | * zero_free: The nunber of zero and free pages. | |
254 | * page_file_writes: The writes to the page file in pages. | |
255 | * io_diff: An indicator of file cache efficiency or page file activity, | |
256 | * calculated as File Cache Page Fault Count - Page Read Count. | |
257 | * This value is in pages. | |
258 | * | |
259 | * Some of these metrics are Windows specific and fortunately | |
260 | * the algorithm on the host side that computes the guest memory | |
261 | * pressure only uses num_committed value. | |
262 | */ | |
263 | ||
264 | struct dm_status { | |
265 | struct dm_header hdr; | |
266 | __u64 num_avail; | |
267 | __u64 num_committed; | |
268 | __u64 page_file_size; | |
269 | __u64 zero_free; | |
270 | __u32 page_file_writes; | |
271 | __u32 io_diff; | |
272 | } __packed; | |
273 | ||
274 | ||
275 | /* | |
276 | * Message to ask the guest to allocate memory - balloon up message. | |
277 | * This message is sent from the host to the guest. The guest may not be | |
278 | * able to allocate as much memory as requested. | |
279 | * | |
280 | * num_pages: number of pages to allocate. | |
281 | */ | |
282 | ||
283 | struct dm_balloon { | |
284 | struct dm_header hdr; | |
285 | __u32 num_pages; | |
286 | __u32 reservedz; | |
287 | } __packed; | |
288 | ||
289 | ||
290 | /* | |
291 | * Balloon response message; this message is sent from the guest | |
292 | * to the host in response to the balloon message. | |
293 | * | |
294 | * reservedz: Reserved; must be set to zero. | |
295 | * more_pages: If FALSE, this is the last message of the transaction. | |
296 | * if TRUE there will atleast one more message from the guest. | |
297 | * | |
298 | * range_count: The number of ranges in the range array. | |
299 | * | |
300 | * range_array: An array of page ranges returned to the host. | |
301 | * | |
302 | */ | |
303 | ||
304 | struct dm_balloon_response { | |
305 | struct dm_header hdr; | |
306 | __u32 reservedz; | |
307 | __u32 more_pages:1; | |
308 | __u32 range_count:31; | |
309 | union dm_mem_page_range range_array[]; | |
310 | } __packed; | |
311 | ||
312 | /* | |
313 | * Un-balloon message; this message is sent from the host | |
314 | * to the guest to give guest more memory. | |
315 | * | |
316 | * more_pages: If FALSE, this is the last message of the transaction. | |
317 | * if TRUE there will atleast one more message from the guest. | |
318 | * | |
319 | * reservedz: Reserved; must be set to zero. | |
320 | * | |
321 | * range_count: The number of ranges in the range array. | |
322 | * | |
323 | * range_array: An array of page ranges returned to the host. | |
324 | * | |
325 | */ | |
326 | ||
327 | struct dm_unballoon_request { | |
328 | struct dm_header hdr; | |
329 | __u32 more_pages:1; | |
330 | __u32 reservedz:31; | |
331 | __u32 range_count; | |
332 | union dm_mem_page_range range_array[]; | |
333 | } __packed; | |
334 | ||
335 | /* | |
336 | * Un-balloon response message; this message is sent from the guest | |
337 | * to the host in response to an unballoon request. | |
338 | * | |
339 | */ | |
340 | ||
341 | struct dm_unballoon_response { | |
342 | struct dm_header hdr; | |
343 | } __packed; | |
344 | ||
345 | ||
346 | /* | |
347 | * Hot add request message. Message sent from the host to the guest. | |
348 | * | |
349 | * mem_range: Memory range to hot add. | |
350 | * | |
351 | * On Linux we currently don't support this since we cannot hot add | |
352 | * arbitrary granularity of memory. | |
353 | */ | |
354 | ||
355 | struct dm_hot_add { | |
356 | struct dm_header hdr; | |
357 | union dm_mem_page_range range; | |
358 | } __packed; | |
359 | ||
360 | /* | |
361 | * Hot add response message. | |
362 | * This message is sent by the guest to report the status of a hot add request. | |
363 | * If page_count is less than the requested page count, then the host should | |
364 | * assume all further hot add requests will fail, since this indicates that | |
365 | * the guest has hit an upper physical memory barrier. | |
366 | * | |
367 | * Hot adds may also fail due to low resources; in this case, the guest must | |
368 | * not complete this message until the hot add can succeed, and the host must | |
369 | * not send a new hot add request until the response is sent. | |
370 | * If VSC fails to hot add memory DYNMEM_NUMBER_OF_UNSUCCESSFUL_HOTADD_ATTEMPTS | |
371 | * times it fails the request. | |
372 | * | |
373 | * | |
374 | * page_count: number of pages that were successfully hot added. | |
375 | * | |
376 | * result: result of the operation 1: success, 0: failure. | |
377 | * | |
378 | */ | |
379 | ||
380 | struct dm_hot_add_response { | |
381 | struct dm_header hdr; | |
382 | __u32 page_count; | |
383 | __u32 result; | |
384 | } __packed; | |
385 | ||
386 | /* | |
387 | * Types of information sent from host to the guest. | |
388 | */ | |
389 | ||
390 | enum dm_info_type { | |
391 | INFO_TYPE_MAX_PAGE_CNT = 0, | |
392 | MAX_INFO_TYPE | |
393 | }; | |
394 | ||
395 | ||
396 | /* | |
397 | * Header for the information message. | |
398 | */ | |
399 | ||
400 | struct dm_info_header { | |
401 | enum dm_info_type type; | |
402 | __u32 data_size; | |
403 | } __packed; | |
404 | ||
405 | /* | |
406 | * This message is sent from the host to the guest to pass | |
407 | * some relevant information (win8 addition). | |
408 | * | |
409 | * reserved: no used. | |
410 | * info_size: size of the information blob. | |
411 | * info: information blob. | |
412 | */ | |
413 | ||
414 | struct dm_info_msg { | |
6427a0d7 | 415 | struct dm_header hdr; |
9aa8b50b S |
416 | __u32 reserved; |
417 | __u32 info_size; | |
418 | __u8 info[]; | |
419 | }; | |
420 | ||
421 | /* | |
422 | * End protocol definitions. | |
423 | */ | |
424 | ||
1cac8cd4 S |
425 | /* |
426 | * State to manage hot adding memory into the guest. | |
427 | * The range start_pfn : end_pfn specifies the range | |
428 | * that the host has asked us to hot add. The range | |
429 | * start_pfn : ha_end_pfn specifies the range that we have | |
430 | * currently hot added. We hot add in multiples of 128M | |
431 | * chunks; it is possible that we may not be able to bring | |
432 | * online all the pages in the region. The range | |
7cf3b79e | 433 | * covered_start_pfn:covered_end_pfn defines the pages that can |
1cac8cd4 S |
434 | * be brough online. |
435 | */ | |
436 | ||
437 | struct hv_hotadd_state { | |
438 | struct list_head list; | |
439 | unsigned long start_pfn; | |
7cf3b79e | 440 | unsigned long covered_start_pfn; |
1cac8cd4 S |
441 | unsigned long covered_end_pfn; |
442 | unsigned long ha_end_pfn; | |
443 | unsigned long end_pfn; | |
444 | }; | |
445 | ||
6571b2da S |
446 | struct balloon_state { |
447 | __u32 num_pages; | |
448 | struct work_struct wrk; | |
449 | }; | |
450 | ||
c51af826 S |
451 | struct hot_add_wrk { |
452 | union dm_mem_page_range ha_page_range; | |
1cac8cd4 | 453 | union dm_mem_page_range ha_region_range; |
c51af826 S |
454 | struct work_struct wrk; |
455 | }; | |
456 | ||
1cac8cd4 | 457 | static bool hot_add = true; |
9aa8b50b | 458 | static bool do_hot_add; |
e500d158 S |
459 | /* |
460 | * Delay reporting memory pressure by | |
461 | * the specified number of seconds. | |
462 | */ | |
1cac8cd4 | 463 | static uint pressure_report_delay = 45; |
9aa8b50b | 464 | |
ae339336 S |
465 | /* |
466 | * The last time we posted a pressure report to host. | |
467 | */ | |
468 | static unsigned long last_post_time; | |
469 | ||
9aa8b50b S |
470 | module_param(hot_add, bool, (S_IRUGO | S_IWUSR)); |
471 | MODULE_PARM_DESC(hot_add, "If set attempt memory hot_add"); | |
472 | ||
e500d158 S |
473 | module_param(pressure_report_delay, uint, (S_IRUGO | S_IWUSR)); |
474 | MODULE_PARM_DESC(pressure_report_delay, "Delay in secs in reporting pressure"); | |
9aa8b50b S |
475 | static atomic_t trans_id = ATOMIC_INIT(0); |
476 | ||
477 | static int dm_ring_size = (5 * PAGE_SIZE); | |
478 | ||
479 | /* | |
480 | * Driver specific state. | |
481 | */ | |
482 | ||
483 | enum hv_dm_state { | |
484 | DM_INITIALIZING = 0, | |
485 | DM_INITIALIZED, | |
486 | DM_BALLOON_UP, | |
487 | DM_BALLOON_DOWN, | |
488 | DM_HOT_ADD, | |
489 | DM_INIT_ERROR | |
490 | }; | |
491 | ||
492 | ||
493 | static __u8 recv_buffer[PAGE_SIZE]; | |
494 | static __u8 *send_buffer; | |
495 | #define PAGES_IN_2M 512 | |
1cac8cd4 | 496 | #define HA_CHUNK (32 * 1024) |
9aa8b50b S |
497 | |
498 | struct hv_dynmem_device { | |
499 | struct hv_device *dev; | |
500 | enum hv_dm_state state; | |
501 | struct completion host_event; | |
502 | struct completion config_event; | |
503 | ||
504 | /* | |
505 | * Number of pages we have currently ballooned out. | |
506 | */ | |
507 | unsigned int num_pages_ballooned; | |
549fd280 VK |
508 | unsigned int num_pages_onlined; |
509 | unsigned int num_pages_added; | |
9aa8b50b S |
510 | |
511 | /* | |
6571b2da S |
512 | * State to manage the ballooning (up) operation. |
513 | */ | |
514 | struct balloon_state balloon_wrk; | |
515 | ||
c51af826 S |
516 | /* |
517 | * State to execute the "hot-add" operation. | |
518 | */ | |
519 | struct hot_add_wrk ha_wrk; | |
520 | ||
1cac8cd4 S |
521 | /* |
522 | * This state tracks if the host has specified a hot-add | |
523 | * region. | |
524 | */ | |
525 | bool host_specified_ha_region; | |
526 | ||
527 | /* | |
528 | * State to synchronize hot-add. | |
529 | */ | |
530 | struct completion ol_waitevent; | |
531 | bool ha_waiting; | |
6571b2da S |
532 | /* |
533 | * This thread handles hot-add | |
9aa8b50b S |
534 | * requests from the host as well as notifying |
535 | * the host with regards to memory pressure in | |
536 | * the guest. | |
537 | */ | |
538 | struct task_struct *thread; | |
539 | ||
22f88475 | 540 | struct mutex ha_region_mutex; |
22f88475 | 541 | |
1cac8cd4 S |
542 | /* |
543 | * A list of hot-add regions. | |
544 | */ | |
545 | struct list_head ha_region_list; | |
546 | ||
9aa8b50b S |
547 | /* |
548 | * We start with the highest version we can support | |
549 | * and downgrade based on the host; we save here the | |
550 | * next version to try. | |
551 | */ | |
552 | __u32 next_version; | |
553 | }; | |
554 | ||
555 | static struct hv_dynmem_device dm_device; | |
556 | ||
ae339336 | 557 | static void post_status(struct hv_dynmem_device *dm); |
22f88475 | 558 | |
1cac8cd4 | 559 | #ifdef CONFIG_MEMORY_HOTPLUG |
22f88475 S |
560 | static int hv_memory_notifier(struct notifier_block *nb, unsigned long val, |
561 | void *v) | |
562 | { | |
549fd280 VK |
563 | struct memory_notify *mem = (struct memory_notify *)v; |
564 | ||
22f88475 S |
565 | switch (val) { |
566 | case MEM_GOING_ONLINE: | |
b05d8d9e | 567 | mutex_lock(&dm_device.ha_region_mutex); |
22f88475 S |
568 | break; |
569 | ||
570 | case MEM_ONLINE: | |
549fd280 | 571 | dm_device.num_pages_onlined += mem->nr_pages; |
22f88475 | 572 | case MEM_CANCEL_ONLINE: |
4e4bd36f VK |
573 | if (val == MEM_ONLINE || |
574 | mutex_is_locked(&dm_device.ha_region_mutex)) | |
575 | mutex_unlock(&dm_device.ha_region_mutex); | |
22f88475 S |
576 | if (dm_device.ha_waiting) { |
577 | dm_device.ha_waiting = false; | |
578 | complete(&dm_device.ol_waitevent); | |
579 | } | |
580 | break; | |
581 | ||
22f88475 | 582 | case MEM_OFFLINE: |
549fd280 VK |
583 | mutex_lock(&dm_device.ha_region_mutex); |
584 | dm_device.num_pages_onlined -= mem->nr_pages; | |
585 | mutex_unlock(&dm_device.ha_region_mutex); | |
586 | break; | |
587 | case MEM_GOING_OFFLINE: | |
22f88475 S |
588 | case MEM_CANCEL_OFFLINE: |
589 | break; | |
590 | } | |
591 | return NOTIFY_OK; | |
592 | } | |
593 | ||
594 | static struct notifier_block hv_memory_nb = { | |
595 | .notifier_call = hv_memory_notifier, | |
596 | .priority = 0 | |
597 | }; | |
598 | ||
1cac8cd4 | 599 | |
a6025a2a | 600 | static void hv_bring_pgs_online(unsigned long start_pfn, unsigned long size) |
9aa8b50b | 601 | { |
1cac8cd4 | 602 | int i; |
9aa8b50b | 603 | |
1cac8cd4 S |
604 | for (i = 0; i < size; i++) { |
605 | struct page *pg; | |
606 | pg = pfn_to_page(start_pfn + i); | |
607 | __online_page_set_limits(pg); | |
608 | __online_page_increment_counters(pg); | |
609 | __online_page_free(pg); | |
610 | } | |
611 | } | |
612 | ||
613 | static void hv_mem_hot_add(unsigned long start, unsigned long size, | |
614 | unsigned long pfn_count, | |
615 | struct hv_hotadd_state *has) | |
616 | { | |
617 | int ret = 0; | |
ed07ec93 | 618 | int i, nid; |
1cac8cd4 S |
619 | unsigned long start_pfn; |
620 | unsigned long processed_pfn; | |
621 | unsigned long total_pfn = pfn_count; | |
622 | ||
623 | for (i = 0; i < (size/HA_CHUNK); i++) { | |
624 | start_pfn = start + (i * HA_CHUNK); | |
625 | has->ha_end_pfn += HA_CHUNK; | |
626 | ||
627 | if (total_pfn > HA_CHUNK) { | |
628 | processed_pfn = HA_CHUNK; | |
629 | total_pfn -= HA_CHUNK; | |
630 | } else { | |
631 | processed_pfn = total_pfn; | |
632 | total_pfn = 0; | |
633 | } | |
634 | ||
635 | has->covered_end_pfn += processed_pfn; | |
9aa8b50b | 636 | |
1cac8cd4 S |
637 | init_completion(&dm_device.ol_waitevent); |
638 | dm_device.ha_waiting = true; | |
9aa8b50b | 639 | |
b05d8d9e | 640 | mutex_unlock(&dm_device.ha_region_mutex); |
1cac8cd4 S |
641 | nid = memory_add_physaddr_to_nid(PFN_PHYS(start_pfn)); |
642 | ret = add_memory(nid, PFN_PHYS((start_pfn)), | |
643 | (HA_CHUNK << PAGE_SHIFT)); | |
644 | ||
645 | if (ret) { | |
646 | pr_info("hot_add memory failed error is %d\n", ret); | |
7f4f2302 S |
647 | if (ret == -EEXIST) { |
648 | /* | |
649 | * This error indicates that the error | |
650 | * is not a transient failure. This is the | |
651 | * case where the guest's physical address map | |
652 | * precludes hot adding memory. Stop all further | |
653 | * memory hot-add. | |
654 | */ | |
655 | do_hot_add = false; | |
656 | } | |
1cac8cd4 S |
657 | has->ha_end_pfn -= HA_CHUNK; |
658 | has->covered_end_pfn -= processed_pfn; | |
f3f6eb80 | 659 | mutex_lock(&dm_device.ha_region_mutex); |
1cac8cd4 S |
660 | break; |
661 | } | |
9aa8b50b S |
662 | |
663 | /* | |
1cac8cd4 | 664 | * Wait for the memory block to be onlined. |
ed07ec93 S |
665 | * Since the hot add has succeeded, it is ok to |
666 | * proceed even if the pages in the hot added region | |
667 | * have not been "onlined" within the allowed time. | |
9aa8b50b | 668 | */ |
ed07ec93 | 669 | wait_for_completion_timeout(&dm_device.ol_waitevent, 5*HZ); |
b05d8d9e | 670 | mutex_lock(&dm_device.ha_region_mutex); |
ae339336 | 671 | post_status(&dm_device); |
9aa8b50b S |
672 | } |
673 | ||
1cac8cd4 S |
674 | return; |
675 | } | |
676 | ||
677 | static void hv_online_page(struct page *pg) | |
678 | { | |
679 | struct list_head *cur; | |
680 | struct hv_hotadd_state *has; | |
681 | unsigned long cur_start_pgp; | |
682 | unsigned long cur_end_pgp; | |
683 | ||
1cac8cd4 S |
684 | list_for_each(cur, &dm_device.ha_region_list) { |
685 | has = list_entry(cur, struct hv_hotadd_state, list); | |
7cf3b79e VK |
686 | cur_start_pgp = (unsigned long) |
687 | pfn_to_page(has->covered_start_pfn); | |
1cac8cd4 S |
688 | cur_end_pgp = (unsigned long)pfn_to_page(has->covered_end_pfn); |
689 | ||
690 | if (((unsigned long)pg >= cur_start_pgp) && | |
691 | ((unsigned long)pg < cur_end_pgp)) { | |
692 | /* | |
693 | * This frame is currently backed; online the | |
694 | * page. | |
695 | */ | |
696 | __online_page_set_limits(pg); | |
697 | __online_page_increment_counters(pg); | |
698 | __online_page_free(pg); | |
1cac8cd4 S |
699 | } |
700 | } | |
701 | } | |
702 | ||
703 | static bool pfn_covered(unsigned long start_pfn, unsigned long pfn_cnt) | |
704 | { | |
705 | struct list_head *cur; | |
706 | struct hv_hotadd_state *has; | |
707 | unsigned long residual, new_inc; | |
708 | ||
709 | if (list_empty(&dm_device.ha_region_list)) | |
710 | return false; | |
711 | ||
712 | list_for_each(cur, &dm_device.ha_region_list) { | |
713 | has = list_entry(cur, struct hv_hotadd_state, list); | |
714 | ||
715 | /* | |
716 | * If the pfn range we are dealing with is not in the current | |
717 | * "hot add block", move on. | |
718 | */ | |
77c0c973 | 719 | if (start_pfn < has->start_pfn || start_pfn >= has->end_pfn) |
1cac8cd4 S |
720 | continue; |
721 | /* | |
722 | * If the current hot add-request extends beyond | |
723 | * our current limit; extend it. | |
724 | */ | |
725 | if ((start_pfn + pfn_cnt) > has->end_pfn) { | |
726 | residual = (start_pfn + pfn_cnt - has->end_pfn); | |
727 | /* | |
728 | * Extend the region by multiples of HA_CHUNK. | |
729 | */ | |
730 | new_inc = (residual / HA_CHUNK) * HA_CHUNK; | |
731 | if (residual % HA_CHUNK) | |
732 | new_inc += HA_CHUNK; | |
733 | ||
734 | has->end_pfn += new_inc; | |
735 | } | |
736 | ||
737 | /* | |
738 | * If the current start pfn is not where the covered_end | |
739 | * is, update it. | |
740 | */ | |
741 | ||
5abbbb75 | 742 | if (has->covered_end_pfn != start_pfn) |
1cac8cd4 | 743 | has->covered_end_pfn = start_pfn; |
5abbbb75 | 744 | |
1cac8cd4 S |
745 | return true; |
746 | ||
747 | } | |
748 | ||
749 | return false; | |
750 | } | |
751 | ||
752 | static unsigned long handle_pg_range(unsigned long pg_start, | |
753 | unsigned long pg_count) | |
754 | { | |
755 | unsigned long start_pfn = pg_start; | |
756 | unsigned long pfn_cnt = pg_count; | |
757 | unsigned long size; | |
758 | struct list_head *cur; | |
759 | struct hv_hotadd_state *has; | |
760 | unsigned long pgs_ol = 0; | |
761 | unsigned long old_covered_state; | |
762 | ||
763 | if (list_empty(&dm_device.ha_region_list)) | |
764 | return 0; | |
765 | ||
766 | list_for_each(cur, &dm_device.ha_region_list) { | |
767 | has = list_entry(cur, struct hv_hotadd_state, list); | |
768 | ||
769 | /* | |
770 | * If the pfn range we are dealing with is not in the current | |
771 | * "hot add block", move on. | |
772 | */ | |
77c0c973 | 773 | if (start_pfn < has->start_pfn || start_pfn >= has->end_pfn) |
1cac8cd4 S |
774 | continue; |
775 | ||
776 | old_covered_state = has->covered_end_pfn; | |
777 | ||
778 | if (start_pfn < has->ha_end_pfn) { | |
779 | /* | |
780 | * This is the case where we are backing pages | |
781 | * in an already hot added region. Bring | |
782 | * these pages online first. | |
783 | */ | |
784 | pgs_ol = has->ha_end_pfn - start_pfn; | |
785 | if (pgs_ol > pfn_cnt) | |
786 | pgs_ol = pfn_cnt; | |
d6cbd2c3 VK |
787 | |
788 | /* | |
789 | * Check if the corresponding memory block is already | |
790 | * online by checking its last previously backed page. | |
791 | * In case it is we need to bring rest (which was not | |
792 | * backed previously) online too. | |
793 | */ | |
794 | if (start_pfn > has->start_pfn && | |
795 | !PageReserved(pfn_to_page(start_pfn - 1))) | |
796 | hv_bring_pgs_online(start_pfn, pgs_ol); | |
797 | ||
1cac8cd4 | 798 | has->covered_end_pfn += pgs_ol; |
1cac8cd4 S |
799 | pfn_cnt -= pgs_ol; |
800 | } | |
801 | ||
802 | if ((has->ha_end_pfn < has->end_pfn) && (pfn_cnt > 0)) { | |
803 | /* | |
804 | * We have some residual hot add range | |
805 | * that needs to be hot added; hot add | |
806 | * it now. Hot add a multiple of | |
807 | * of HA_CHUNK that fully covers the pages | |
808 | * we have. | |
809 | */ | |
810 | size = (has->end_pfn - has->ha_end_pfn); | |
811 | if (pfn_cnt <= size) { | |
812 | size = ((pfn_cnt / HA_CHUNK) * HA_CHUNK); | |
813 | if (pfn_cnt % HA_CHUNK) | |
814 | size += HA_CHUNK; | |
815 | } else { | |
816 | pfn_cnt = size; | |
817 | } | |
818 | hv_mem_hot_add(has->ha_end_pfn, size, pfn_cnt, has); | |
819 | } | |
820 | /* | |
821 | * If we managed to online any pages that were given to us, | |
822 | * we declare success. | |
823 | */ | |
824 | return has->covered_end_pfn - old_covered_state; | |
825 | ||
826 | } | |
827 | ||
828 | return 0; | |
829 | } | |
830 | ||
831 | static unsigned long process_hot_add(unsigned long pg_start, | |
832 | unsigned long pfn_cnt, | |
833 | unsigned long rg_start, | |
834 | unsigned long rg_size) | |
835 | { | |
836 | struct hv_hotadd_state *ha_region = NULL; | |
837 | ||
838 | if (pfn_cnt == 0) | |
839 | return 0; | |
840 | ||
841 | if (!dm_device.host_specified_ha_region) | |
842 | if (pfn_covered(pg_start, pfn_cnt)) | |
843 | goto do_pg_range; | |
844 | ||
845 | /* | |
846 | * If the host has specified a hot-add range; deal with it first. | |
847 | */ | |
848 | ||
647965a2 | 849 | if (rg_size != 0) { |
1cac8cd4 S |
850 | ha_region = kzalloc(sizeof(struct hv_hotadd_state), GFP_KERNEL); |
851 | if (!ha_region) | |
852 | return 0; | |
853 | ||
854 | INIT_LIST_HEAD(&ha_region->list); | |
855 | ||
856 | list_add_tail(&ha_region->list, &dm_device.ha_region_list); | |
857 | ha_region->start_pfn = rg_start; | |
858 | ha_region->ha_end_pfn = rg_start; | |
7cf3b79e | 859 | ha_region->covered_start_pfn = pg_start; |
1cac8cd4 S |
860 | ha_region->covered_end_pfn = pg_start; |
861 | ha_region->end_pfn = rg_start + rg_size; | |
862 | } | |
863 | ||
864 | do_pg_range: | |
865 | /* | |
866 | * Process the page range specified; bringing them | |
867 | * online if possible. | |
868 | */ | |
869 | return handle_pg_range(pg_start, pfn_cnt); | |
870 | } | |
871 | ||
872 | #endif | |
873 | ||
874 | static void hot_add_req(struct work_struct *dummy) | |
875 | { | |
876 | struct dm_hot_add_response resp; | |
877 | #ifdef CONFIG_MEMORY_HOTPLUG | |
878 | unsigned long pg_start, pfn_cnt; | |
879 | unsigned long rg_start, rg_sz; | |
880 | #endif | |
881 | struct hv_dynmem_device *dm = &dm_device; | |
882 | ||
9aa8b50b S |
883 | memset(&resp, 0, sizeof(struct dm_hot_add_response)); |
884 | resp.hdr.type = DM_MEM_HOT_ADD_RESPONSE; | |
885 | resp.hdr.size = sizeof(struct dm_hot_add_response); | |
9aa8b50b | 886 | |
1cac8cd4 | 887 | #ifdef CONFIG_MEMORY_HOTPLUG |
b05d8d9e | 888 | mutex_lock(&dm_device.ha_region_mutex); |
1cac8cd4 S |
889 | pg_start = dm->ha_wrk.ha_page_range.finfo.start_page; |
890 | pfn_cnt = dm->ha_wrk.ha_page_range.finfo.page_cnt; | |
9aa8b50b | 891 | |
1cac8cd4 S |
892 | rg_start = dm->ha_wrk.ha_region_range.finfo.start_page; |
893 | rg_sz = dm->ha_wrk.ha_region_range.finfo.page_cnt; | |
894 | ||
895 | if ((rg_start == 0) && (!dm->host_specified_ha_region)) { | |
896 | unsigned long region_size; | |
897 | unsigned long region_start; | |
898 | ||
899 | /* | |
900 | * The host has not specified the hot-add region. | |
901 | * Based on the hot-add page range being specified, | |
902 | * compute a hot-add region that can cover the pages | |
903 | * that need to be hot-added while ensuring the alignment | |
904 | * and size requirements of Linux as it relates to hot-add. | |
905 | */ | |
906 | region_start = pg_start; | |
907 | region_size = (pfn_cnt / HA_CHUNK) * HA_CHUNK; | |
908 | if (pfn_cnt % HA_CHUNK) | |
909 | region_size += HA_CHUNK; | |
910 | ||
911 | region_start = (pg_start / HA_CHUNK) * HA_CHUNK; | |
912 | ||
913 | rg_start = region_start; | |
914 | rg_sz = region_size; | |
915 | } | |
916 | ||
7f4f2302 S |
917 | if (do_hot_add) |
918 | resp.page_count = process_hot_add(pg_start, pfn_cnt, | |
919 | rg_start, rg_sz); | |
549fd280 VK |
920 | |
921 | dm->num_pages_added += resp.page_count; | |
b05d8d9e | 922 | mutex_unlock(&dm_device.ha_region_mutex); |
1cac8cd4 | 923 | #endif |
7f4f2302 S |
924 | /* |
925 | * The result field of the response structure has the | |
926 | * following semantics: | |
927 | * | |
928 | * 1. If all or some pages hot-added: Guest should return success. | |
929 | * | |
930 | * 2. If no pages could be hot-added: | |
931 | * | |
932 | * If the guest returns success, then the host | |
933 | * will not attempt any further hot-add operations. This | |
934 | * signifies a permanent failure. | |
935 | * | |
936 | * If the guest returns failure, then this failure will be | |
937 | * treated as a transient failure and the host may retry the | |
938 | * hot-add operation after some delay. | |
939 | */ | |
1cac8cd4 S |
940 | if (resp.page_count > 0) |
941 | resp.result = 1; | |
7f4f2302 S |
942 | else if (!do_hot_add) |
943 | resp.result = 1; | |
1cac8cd4 S |
944 | else |
945 | resp.result = 0; | |
946 | ||
947 | if (!do_hot_add || (resp.page_count == 0)) | |
948 | pr_info("Memory hot add failed\n"); | |
949 | ||
950 | dm->state = DM_INITIALIZED; | |
20138d6c | 951 | resp.hdr.trans_id = atomic_inc_return(&trans_id); |
1cac8cd4 | 952 | vmbus_sendpacket(dm->dev->channel, &resp, |
9aa8b50b S |
953 | sizeof(struct dm_hot_add_response), |
954 | (unsigned long)NULL, | |
955 | VM_PKT_DATA_INBAND, 0); | |
9aa8b50b S |
956 | } |
957 | ||
958 | static void process_info(struct hv_dynmem_device *dm, struct dm_info_msg *msg) | |
959 | { | |
6427a0d7 S |
960 | struct dm_info_header *info_hdr; |
961 | ||
962 | info_hdr = (struct dm_info_header *)msg->info; | |
963 | ||
964 | switch (info_hdr->type) { | |
9aa8b50b S |
965 | case INFO_TYPE_MAX_PAGE_CNT: |
966 | pr_info("Received INFO_TYPE_MAX_PAGE_CNT\n"); | |
6427a0d7 | 967 | pr_info("Data Size is %d\n", info_hdr->data_size); |
9aa8b50b S |
968 | break; |
969 | default: | |
6427a0d7 | 970 | pr_info("Received Unknown type: %d\n", info_hdr->type); |
9aa8b50b S |
971 | } |
972 | } | |
973 | ||
a6025a2a | 974 | static unsigned long compute_balloon_floor(void) |
1c7db96f S |
975 | { |
976 | unsigned long min_pages; | |
977 | #define MB2PAGES(mb) ((mb) << (20 - PAGE_SHIFT)) | |
978 | /* Simple continuous piecewiese linear function: | |
979 | * max MiB -> min MiB gradient | |
980 | * 0 0 | |
981 | * 16 16 | |
982 | * 32 24 | |
983 | * 128 72 (1/2) | |
984 | * 512 168 (1/4) | |
985 | * 2048 360 (1/8) | |
7fb0e1a6 VK |
986 | * 8192 744 (1/16) |
987 | * 32768 1512 (1/32) | |
1c7db96f S |
988 | */ |
989 | if (totalram_pages < MB2PAGES(128)) | |
990 | min_pages = MB2PAGES(8) + (totalram_pages >> 1); | |
991 | else if (totalram_pages < MB2PAGES(512)) | |
992 | min_pages = MB2PAGES(40) + (totalram_pages >> 2); | |
993 | else if (totalram_pages < MB2PAGES(2048)) | |
994 | min_pages = MB2PAGES(104) + (totalram_pages >> 3); | |
79208c57 | 995 | else if (totalram_pages < MB2PAGES(8192)) |
7fb0e1a6 | 996 | min_pages = MB2PAGES(232) + (totalram_pages >> 4); |
1c7db96f | 997 | else |
7fb0e1a6 | 998 | min_pages = MB2PAGES(488) + (totalram_pages >> 5); |
1c7db96f S |
999 | #undef MB2PAGES |
1000 | return min_pages; | |
1001 | } | |
1002 | ||
9aa8b50b S |
1003 | /* |
1004 | * Post our status as it relates memory pressure to the | |
1005 | * host. Host expects the guests to post this status | |
1006 | * periodically at 1 second intervals. | |
1007 | * | |
1008 | * The metrics specified in this protocol are very Windows | |
1009 | * specific and so we cook up numbers here to convey our memory | |
1010 | * pressure. | |
1011 | */ | |
1012 | ||
1013 | static void post_status(struct hv_dynmem_device *dm) | |
1014 | { | |
1015 | struct dm_status status; | |
0731572b | 1016 | struct sysinfo val; |
ae339336 S |
1017 | unsigned long now = jiffies; |
1018 | unsigned long last_post = last_post_time; | |
9aa8b50b | 1019 | |
e500d158 S |
1020 | if (pressure_report_delay > 0) { |
1021 | --pressure_report_delay; | |
1022 | return; | |
1023 | } | |
ae339336 S |
1024 | |
1025 | if (!time_after(now, (last_post_time + HZ))) | |
1026 | return; | |
1027 | ||
0731572b | 1028 | si_meminfo(&val); |
9aa8b50b S |
1029 | memset(&status, 0, sizeof(struct dm_status)); |
1030 | status.hdr.type = DM_STATUS_REPORT; | |
1031 | status.hdr.size = sizeof(struct dm_status); | |
1032 | status.hdr.trans_id = atomic_inc_return(&trans_id); | |
1033 | ||
0731572b | 1034 | /* |
549fd280 VK |
1035 | * The host expects the guest to report free and committed memory. |
1036 | * Furthermore, the host expects the pressure information to include | |
1037 | * the ballooned out pages. For a given amount of memory that we are | |
1038 | * managing we need to compute a floor below which we should not | |
1039 | * balloon. Compute this and add it to the pressure report. | |
1040 | * We also need to report all offline pages (num_pages_added - | |
1041 | * num_pages_onlined) as committed to the host, otherwise it can try | |
1042 | * asking us to balloon them out. | |
0731572b S |
1043 | */ |
1044 | status.num_avail = val.freeram; | |
1c7db96f | 1045 | status.num_committed = vm_memory_committed() + |
549fd280 VK |
1046 | dm->num_pages_ballooned + |
1047 | (dm->num_pages_added > dm->num_pages_onlined ? | |
1048 | dm->num_pages_added - dm->num_pages_onlined : 0) + | |
1049 | compute_balloon_floor(); | |
9aa8b50b | 1050 | |
c5e2254f S |
1051 | /* |
1052 | * If our transaction ID is no longer current, just don't | |
1053 | * send the status. This can happen if we were interrupted | |
1054 | * after we picked our transaction ID. | |
1055 | */ | |
1056 | if (status.hdr.trans_id != atomic_read(&trans_id)) | |
1057 | return; | |
1058 | ||
ae339336 S |
1059 | /* |
1060 | * If the last post time that we sampled has changed, | |
1061 | * we have raced, don't post the status. | |
1062 | */ | |
1063 | if (last_post != last_post_time) | |
1064 | return; | |
1065 | ||
1066 | last_post_time = jiffies; | |
9aa8b50b S |
1067 | vmbus_sendpacket(dm->dev->channel, &status, |
1068 | sizeof(struct dm_status), | |
1069 | (unsigned long)NULL, | |
1070 | VM_PKT_DATA_INBAND, 0); | |
1071 | ||
1072 | } | |
1073 | ||
989623c7 | 1074 | static void free_balloon_pages(struct hv_dynmem_device *dm, |
9aa8b50b S |
1075 | union dm_mem_page_range *range_array) |
1076 | { | |
1077 | int num_pages = range_array->finfo.page_cnt; | |
1078 | __u64 start_frame = range_array->finfo.start_page; | |
1079 | struct page *pg; | |
1080 | int i; | |
1081 | ||
1082 | for (i = 0; i < num_pages; i++) { | |
1083 | pg = pfn_to_page(i + start_frame); | |
1084 | __free_page(pg); | |
1085 | dm->num_pages_ballooned--; | |
1086 | } | |
1087 | } | |
1088 | ||
1089 | ||
1090 | ||
797f88c9 VK |
1091 | static unsigned int alloc_balloon_pages(struct hv_dynmem_device *dm, |
1092 | unsigned int num_pages, | |
1093 | struct dm_balloon_response *bl_resp, | |
1094 | int alloc_unit) | |
9aa8b50b | 1095 | { |
797f88c9 | 1096 | unsigned int i = 0; |
9aa8b50b S |
1097 | struct page *pg; |
1098 | ||
1099 | if (num_pages < alloc_unit) | |
1100 | return 0; | |
1101 | ||
1102 | for (i = 0; (i * alloc_unit) < num_pages; i++) { | |
1103 | if (bl_resp->hdr.size + sizeof(union dm_mem_page_range) > | |
1104 | PAGE_SIZE) | |
1105 | return i * alloc_unit; | |
1106 | ||
1107 | /* | |
1108 | * We execute this code in a thread context. Furthermore, | |
1109 | * we don't want the kernel to try too hard. | |
1110 | */ | |
1111 | pg = alloc_pages(GFP_HIGHUSER | __GFP_NORETRY | | |
1112 | __GFP_NOMEMALLOC | __GFP_NOWARN, | |
1113 | get_order(alloc_unit << PAGE_SHIFT)); | |
1114 | ||
0a1a86ac | 1115 | if (!pg) |
9aa8b50b | 1116 | return i * alloc_unit; |
9aa8b50b S |
1117 | |
1118 | dm->num_pages_ballooned += alloc_unit; | |
1119 | ||
f766dc1e S |
1120 | /* |
1121 | * If we allocatted 2M pages; split them so we | |
1122 | * can free them in any order we get. | |
1123 | */ | |
1124 | ||
1125 | if (alloc_unit != 1) | |
1126 | split_page(pg, get_order(alloc_unit << PAGE_SHIFT)); | |
1127 | ||
9aa8b50b S |
1128 | bl_resp->range_count++; |
1129 | bl_resp->range_array[i].finfo.start_page = | |
1130 | page_to_pfn(pg); | |
1131 | bl_resp->range_array[i].finfo.page_cnt = alloc_unit; | |
1132 | bl_resp->hdr.size += sizeof(union dm_mem_page_range); | |
1133 | ||
1134 | } | |
1135 | ||
1136 | return num_pages; | |
1137 | } | |
1138 | ||
1139 | ||
1140 | ||
6571b2da | 1141 | static void balloon_up(struct work_struct *dummy) |
9aa8b50b | 1142 | { |
797f88c9 VK |
1143 | unsigned int num_pages = dm_device.balloon_wrk.num_pages; |
1144 | unsigned int num_ballooned = 0; | |
9aa8b50b S |
1145 | struct dm_balloon_response *bl_resp; |
1146 | int alloc_unit; | |
1147 | int ret; | |
9aa8b50b S |
1148 | bool done = false; |
1149 | int i; | |
530d15b9 VK |
1150 | struct sysinfo val; |
1151 | unsigned long floor; | |
9aa8b50b | 1152 | |
f6712238 DC |
1153 | /* The host balloons pages in 2M granularity. */ |
1154 | WARN_ON_ONCE(num_pages % PAGES_IN_2M != 0); | |
9aa8b50b S |
1155 | |
1156 | /* | |
f766dc1e S |
1157 | * We will attempt 2M allocations. However, if we fail to |
1158 | * allocate 2M chunks, we will go back to 4k allocations. | |
9aa8b50b | 1159 | */ |
f766dc1e | 1160 | alloc_unit = 512; |
9aa8b50b | 1161 | |
530d15b9 VK |
1162 | si_meminfo(&val); |
1163 | floor = compute_balloon_floor(); | |
1164 | ||
1165 | /* Refuse to balloon below the floor, keep the 2M granularity. */ | |
ba0c4441 | 1166 | if (val.freeram < num_pages || val.freeram - num_pages < floor) { |
530d15b9 VK |
1167 | num_pages = val.freeram > floor ? (val.freeram - floor) : 0; |
1168 | num_pages -= num_pages % PAGES_IN_2M; | |
1169 | } | |
1170 | ||
9aa8b50b S |
1171 | while (!done) { |
1172 | bl_resp = (struct dm_balloon_response *)send_buffer; | |
1173 | memset(send_buffer, 0, PAGE_SIZE); | |
1174 | bl_resp->hdr.type = DM_BALLOON_RESPONSE; | |
9aa8b50b S |
1175 | bl_resp->hdr.size = sizeof(struct dm_balloon_response); |
1176 | bl_resp->more_pages = 1; | |
1177 | ||
1178 | ||
1179 | num_pages -= num_ballooned; | |
6571b2da | 1180 | num_ballooned = alloc_balloon_pages(&dm_device, num_pages, |
0a1a86ac | 1181 | bl_resp, alloc_unit); |
9aa8b50b | 1182 | |
f6712238 | 1183 | if (alloc_unit != 1 && num_ballooned == 0) { |
f766dc1e S |
1184 | alloc_unit = 1; |
1185 | continue; | |
1186 | } | |
1187 | ||
0a1a86ac | 1188 | if (num_ballooned == 0 || num_ballooned == num_pages) { |
9aa8b50b S |
1189 | bl_resp->more_pages = 0; |
1190 | done = true; | |
6571b2da | 1191 | dm_device.state = DM_INITIALIZED; |
9aa8b50b S |
1192 | } |
1193 | ||
1194 | /* | |
1195 | * We are pushing a lot of data through the channel; | |
1196 | * deal with transient failures caused because of the | |
1197 | * lack of space in the ring buffer. | |
1198 | */ | |
1199 | ||
1200 | do { | |
20138d6c | 1201 | bl_resp->hdr.trans_id = atomic_inc_return(&trans_id); |
9aa8b50b S |
1202 | ret = vmbus_sendpacket(dm_device.dev->channel, |
1203 | bl_resp, | |
1204 | bl_resp->hdr.size, | |
1205 | (unsigned long)NULL, | |
1206 | VM_PKT_DATA_INBAND, 0); | |
1207 | ||
1208 | if (ret == -EAGAIN) | |
1209 | msleep(20); | |
ae339336 | 1210 | post_status(&dm_device); |
9aa8b50b S |
1211 | } while (ret == -EAGAIN); |
1212 | ||
1213 | if (ret) { | |
1214 | /* | |
1215 | * Free up the memory we allocatted. | |
1216 | */ | |
1217 | pr_info("Balloon response failed\n"); | |
1218 | ||
1219 | for (i = 0; i < bl_resp->range_count; i++) | |
6571b2da | 1220 | free_balloon_pages(&dm_device, |
9aa8b50b S |
1221 | &bl_resp->range_array[i]); |
1222 | ||
1223 | done = true; | |
1224 | } | |
1225 | } | |
1226 | ||
1227 | } | |
1228 | ||
1229 | static void balloon_down(struct hv_dynmem_device *dm, | |
1230 | struct dm_unballoon_request *req) | |
1231 | { | |
1232 | union dm_mem_page_range *range_array = req->range_array; | |
1233 | int range_count = req->range_count; | |
1234 | struct dm_unballoon_response resp; | |
1235 | int i; | |
1236 | ||
ae339336 | 1237 | for (i = 0; i < range_count; i++) { |
9aa8b50b | 1238 | free_balloon_pages(dm, &range_array[i]); |
ab3de22b | 1239 | complete(&dm_device.config_event); |
ae339336 | 1240 | } |
9aa8b50b S |
1241 | |
1242 | if (req->more_pages == 1) | |
1243 | return; | |
1244 | ||
1245 | memset(&resp, 0, sizeof(struct dm_unballoon_response)); | |
1246 | resp.hdr.type = DM_UNBALLOON_RESPONSE; | |
1247 | resp.hdr.trans_id = atomic_inc_return(&trans_id); | |
1248 | resp.hdr.size = sizeof(struct dm_unballoon_response); | |
1249 | ||
1250 | vmbus_sendpacket(dm_device.dev->channel, &resp, | |
1251 | sizeof(struct dm_unballoon_response), | |
1252 | (unsigned long)NULL, | |
1253 | VM_PKT_DATA_INBAND, 0); | |
1254 | ||
1255 | dm->state = DM_INITIALIZED; | |
1256 | } | |
1257 | ||
1258 | static void balloon_onchannelcallback(void *context); | |
1259 | ||
1260 | static int dm_thread_func(void *dm_dev) | |
1261 | { | |
1262 | struct hv_dynmem_device *dm = dm_dev; | |
9aa8b50b S |
1263 | |
1264 | while (!kthread_should_stop()) { | |
ab3de22b | 1265 | wait_for_completion_interruptible_timeout( |
5dba4c56 | 1266 | &dm_device.config_event, 1*HZ); |
9aa8b50b S |
1267 | /* |
1268 | * The host expects us to post information on the memory | |
1269 | * pressure every second. | |
1270 | */ | |
ab3de22b S |
1271 | reinit_completion(&dm_device.config_event); |
1272 | post_status(dm); | |
9aa8b50b S |
1273 | } |
1274 | ||
1275 | return 0; | |
1276 | } | |
1277 | ||
1278 | ||
1279 | static void version_resp(struct hv_dynmem_device *dm, | |
1280 | struct dm_version_response *vresp) | |
1281 | { | |
1282 | struct dm_version_request version_req; | |
1283 | int ret; | |
1284 | ||
1285 | if (vresp->is_accepted) { | |
1286 | /* | |
1287 | * We are done; wakeup the | |
1288 | * context waiting for version | |
1289 | * negotiation. | |
1290 | */ | |
1291 | complete(&dm->host_event); | |
1292 | return; | |
1293 | } | |
1294 | /* | |
1295 | * If there are more versions to try, continue | |
1296 | * with negotiations; if not | |
1297 | * shutdown the service since we are not able | |
1298 | * to negotiate a suitable version number | |
1299 | * with the host. | |
1300 | */ | |
1301 | if (dm->next_version == 0) | |
1302 | goto version_error; | |
1303 | ||
9aa8b50b S |
1304 | memset(&version_req, 0, sizeof(struct dm_version_request)); |
1305 | version_req.hdr.type = DM_VERSION_REQUEST; | |
1306 | version_req.hdr.size = sizeof(struct dm_version_request); | |
1307 | version_req.hdr.trans_id = atomic_inc_return(&trans_id); | |
b6ddeae1 AN |
1308 | version_req.version.version = dm->next_version; |
1309 | ||
1310 | /* | |
1311 | * Set the next version to try in case current version fails. | |
1312 | * Win7 protocol ought to be the last one to try. | |
1313 | */ | |
1314 | switch (version_req.version.version) { | |
1315 | case DYNMEM_PROTOCOL_VERSION_WIN8: | |
1316 | dm->next_version = DYNMEM_PROTOCOL_VERSION_WIN7; | |
1317 | version_req.is_last_attempt = 0; | |
1318 | break; | |
1319 | default: | |
1320 | dm->next_version = 0; | |
1321 | version_req.is_last_attempt = 1; | |
1322 | } | |
9aa8b50b S |
1323 | |
1324 | ret = vmbus_sendpacket(dm->dev->channel, &version_req, | |
1325 | sizeof(struct dm_version_request), | |
1326 | (unsigned long)NULL, | |
1327 | VM_PKT_DATA_INBAND, 0); | |
1328 | ||
1329 | if (ret) | |
1330 | goto version_error; | |
1331 | ||
1332 | return; | |
1333 | ||
1334 | version_error: | |
1335 | dm->state = DM_INIT_ERROR; | |
1336 | complete(&dm->host_event); | |
1337 | } | |
1338 | ||
1339 | static void cap_resp(struct hv_dynmem_device *dm, | |
1340 | struct dm_capabilities_resp_msg *cap_resp) | |
1341 | { | |
1342 | if (!cap_resp->is_accepted) { | |
1343 | pr_info("Capabilities not accepted by host\n"); | |
1344 | dm->state = DM_INIT_ERROR; | |
1345 | } | |
1346 | complete(&dm->host_event); | |
1347 | } | |
1348 | ||
1349 | static void balloon_onchannelcallback(void *context) | |
1350 | { | |
1351 | struct hv_device *dev = context; | |
1352 | u32 recvlen; | |
1353 | u64 requestid; | |
1354 | struct dm_message *dm_msg; | |
1355 | struct dm_header *dm_hdr; | |
1356 | struct hv_dynmem_device *dm = hv_get_drvdata(dev); | |
6571b2da | 1357 | struct dm_balloon *bal_msg; |
c51af826 S |
1358 | struct dm_hot_add *ha_msg; |
1359 | union dm_mem_page_range *ha_pg_range; | |
1cac8cd4 | 1360 | union dm_mem_page_range *ha_region; |
9aa8b50b S |
1361 | |
1362 | memset(recv_buffer, 0, sizeof(recv_buffer)); | |
1363 | vmbus_recvpacket(dev->channel, recv_buffer, | |
1364 | PAGE_SIZE, &recvlen, &requestid); | |
1365 | ||
1366 | if (recvlen > 0) { | |
1367 | dm_msg = (struct dm_message *)recv_buffer; | |
1368 | dm_hdr = &dm_msg->hdr; | |
1369 | ||
1370 | switch (dm_hdr->type) { | |
1371 | case DM_VERSION_RESPONSE: | |
1372 | version_resp(dm, | |
1373 | (struct dm_version_response *)dm_msg); | |
1374 | break; | |
1375 | ||
1376 | case DM_CAPABILITIES_RESPONSE: | |
1377 | cap_resp(dm, | |
1378 | (struct dm_capabilities_resp_msg *)dm_msg); | |
1379 | break; | |
1380 | ||
1381 | case DM_BALLOON_REQUEST: | |
6571b2da S |
1382 | if (dm->state == DM_BALLOON_UP) |
1383 | pr_warn("Currently ballooning\n"); | |
1384 | bal_msg = (struct dm_balloon *)recv_buffer; | |
9aa8b50b | 1385 | dm->state = DM_BALLOON_UP; |
6571b2da S |
1386 | dm_device.balloon_wrk.num_pages = bal_msg->num_pages; |
1387 | schedule_work(&dm_device.balloon_wrk.wrk); | |
9aa8b50b S |
1388 | break; |
1389 | ||
1390 | case DM_UNBALLOON_REQUEST: | |
1391 | dm->state = DM_BALLOON_DOWN; | |
1392 | balloon_down(dm, | |
1393 | (struct dm_unballoon_request *)recv_buffer); | |
1394 | break; | |
1395 | ||
1396 | case DM_MEM_HOT_ADD_REQUEST: | |
c51af826 S |
1397 | if (dm->state == DM_HOT_ADD) |
1398 | pr_warn("Currently hot-adding\n"); | |
9aa8b50b | 1399 | dm->state = DM_HOT_ADD; |
c51af826 | 1400 | ha_msg = (struct dm_hot_add *)recv_buffer; |
1cac8cd4 S |
1401 | if (ha_msg->hdr.size == sizeof(struct dm_hot_add)) { |
1402 | /* | |
1403 | * This is a normal hot-add request specifying | |
1404 | * hot-add memory. | |
1405 | */ | |
d19a55d6 | 1406 | dm->host_specified_ha_region = false; |
1cac8cd4 S |
1407 | ha_pg_range = &ha_msg->range; |
1408 | dm->ha_wrk.ha_page_range = *ha_pg_range; | |
1409 | dm->ha_wrk.ha_region_range.page_range = 0; | |
1410 | } else { | |
1411 | /* | |
1412 | * Host is specifying that we first hot-add | |
1413 | * a region and then partially populate this | |
1414 | * region. | |
1415 | */ | |
1416 | dm->host_specified_ha_region = true; | |
1417 | ha_pg_range = &ha_msg->range; | |
1418 | ha_region = &ha_pg_range[1]; | |
1419 | dm->ha_wrk.ha_page_range = *ha_pg_range; | |
1420 | dm->ha_wrk.ha_region_range = *ha_region; | |
1421 | } | |
c51af826 | 1422 | schedule_work(&dm_device.ha_wrk.wrk); |
9aa8b50b S |
1423 | break; |
1424 | ||
1425 | case DM_INFO_MESSAGE: | |
1426 | process_info(dm, (struct dm_info_msg *)dm_msg); | |
1427 | break; | |
1428 | ||
1429 | default: | |
1430 | pr_err("Unhandled message: type: %d\n", dm_hdr->type); | |
1431 | ||
1432 | } | |
1433 | } | |
1434 | ||
1435 | } | |
1436 | ||
1437 | static int balloon_probe(struct hv_device *dev, | |
1438 | const struct hv_vmbus_device_id *dev_id) | |
1439 | { | |
b057b3ad NMG |
1440 | int ret; |
1441 | unsigned long t; | |
9aa8b50b S |
1442 | struct dm_version_request version_req; |
1443 | struct dm_capabilities cap_msg; | |
1444 | ||
1445 | do_hot_add = hot_add; | |
1446 | ||
1447 | /* | |
1448 | * First allocate a send buffer. | |
1449 | */ | |
1450 | ||
1451 | send_buffer = kmalloc(PAGE_SIZE, GFP_KERNEL); | |
1452 | if (!send_buffer) | |
1453 | return -ENOMEM; | |
1454 | ||
1455 | ret = vmbus_open(dev->channel, dm_ring_size, dm_ring_size, NULL, 0, | |
1456 | balloon_onchannelcallback, dev); | |
1457 | ||
1458 | if (ret) | |
33080c1c | 1459 | goto probe_error0; |
9aa8b50b S |
1460 | |
1461 | dm_device.dev = dev; | |
1462 | dm_device.state = DM_INITIALIZING; | |
b6ddeae1 | 1463 | dm_device.next_version = DYNMEM_PROTOCOL_VERSION_WIN8; |
9aa8b50b S |
1464 | init_completion(&dm_device.host_event); |
1465 | init_completion(&dm_device.config_event); | |
1cac8cd4 | 1466 | INIT_LIST_HEAD(&dm_device.ha_region_list); |
22f88475 | 1467 | mutex_init(&dm_device.ha_region_mutex); |
6571b2da | 1468 | INIT_WORK(&dm_device.balloon_wrk.wrk, balloon_up); |
c51af826 | 1469 | INIT_WORK(&dm_device.ha_wrk.wrk, hot_add_req); |
1cac8cd4 | 1470 | dm_device.host_specified_ha_region = false; |
9aa8b50b S |
1471 | |
1472 | dm_device.thread = | |
1473 | kthread_run(dm_thread_func, &dm_device, "hv_balloon"); | |
1474 | if (IS_ERR(dm_device.thread)) { | |
1475 | ret = PTR_ERR(dm_device.thread); | |
33080c1c | 1476 | goto probe_error1; |
9aa8b50b S |
1477 | } |
1478 | ||
1cac8cd4 S |
1479 | #ifdef CONFIG_MEMORY_HOTPLUG |
1480 | set_online_page_callback(&hv_online_page); | |
22f88475 | 1481 | register_memory_notifier(&hv_memory_nb); |
1cac8cd4 S |
1482 | #endif |
1483 | ||
9aa8b50b S |
1484 | hv_set_drvdata(dev, &dm_device); |
1485 | /* | |
1486 | * Initiate the hand shake with the host and negotiate | |
1487 | * a version that the host can support. We start with the | |
1488 | * highest version number and go down if the host cannot | |
1489 | * support it. | |
1490 | */ | |
1491 | memset(&version_req, 0, sizeof(struct dm_version_request)); | |
1492 | version_req.hdr.type = DM_VERSION_REQUEST; | |
1493 | version_req.hdr.size = sizeof(struct dm_version_request); | |
1494 | version_req.hdr.trans_id = atomic_inc_return(&trans_id); | |
b6ddeae1 | 1495 | version_req.version.version = DYNMEM_PROTOCOL_VERSION_WIN10; |
9aa8b50b S |
1496 | version_req.is_last_attempt = 0; |
1497 | ||
1498 | ret = vmbus_sendpacket(dev->channel, &version_req, | |
1499 | sizeof(struct dm_version_request), | |
1500 | (unsigned long)NULL, | |
7a64b864 | 1501 | VM_PKT_DATA_INBAND, 0); |
9aa8b50b | 1502 | if (ret) |
33080c1c | 1503 | goto probe_error2; |
9aa8b50b S |
1504 | |
1505 | t = wait_for_completion_timeout(&dm_device.host_event, 5*HZ); | |
1506 | if (t == 0) { | |
1507 | ret = -ETIMEDOUT; | |
33080c1c | 1508 | goto probe_error2; |
9aa8b50b S |
1509 | } |
1510 | ||
1511 | /* | |
1512 | * If we could not negotiate a compatible version with the host | |
1513 | * fail the probe function. | |
1514 | */ | |
1515 | if (dm_device.state == DM_INIT_ERROR) { | |
1516 | ret = -ETIMEDOUT; | |
33080c1c | 1517 | goto probe_error2; |
9aa8b50b S |
1518 | } |
1519 | /* | |
1520 | * Now submit our capabilities to the host. | |
1521 | */ | |
1522 | memset(&cap_msg, 0, sizeof(struct dm_capabilities)); | |
1523 | cap_msg.hdr.type = DM_CAPABILITIES_REPORT; | |
1524 | cap_msg.hdr.size = sizeof(struct dm_capabilities); | |
1525 | cap_msg.hdr.trans_id = atomic_inc_return(&trans_id); | |
1526 | ||
1527 | cap_msg.caps.cap_bits.balloon = 1; | |
9aa8b50b S |
1528 | cap_msg.caps.cap_bits.hot_add = 1; |
1529 | ||
647965a2 S |
1530 | /* |
1531 | * Specify our alignment requirements as it relates | |
1532 | * memory hot-add. Specify 128MB alignment. | |
1533 | */ | |
1534 | cap_msg.caps.cap_bits.hot_add_alignment = 7; | |
1535 | ||
9aa8b50b S |
1536 | /* |
1537 | * Currently the host does not use these | |
1538 | * values and we set them to what is done in the | |
1539 | * Windows driver. | |
1540 | */ | |
1541 | cap_msg.min_page_cnt = 0; | |
1542 | cap_msg.max_page_number = -1; | |
1543 | ||
1544 | ret = vmbus_sendpacket(dev->channel, &cap_msg, | |
1545 | sizeof(struct dm_capabilities), | |
1546 | (unsigned long)NULL, | |
7a64b864 | 1547 | VM_PKT_DATA_INBAND, 0); |
9aa8b50b | 1548 | if (ret) |
33080c1c | 1549 | goto probe_error2; |
9aa8b50b S |
1550 | |
1551 | t = wait_for_completion_timeout(&dm_device.host_event, 5*HZ); | |
1552 | if (t == 0) { | |
1553 | ret = -ETIMEDOUT; | |
33080c1c | 1554 | goto probe_error2; |
9aa8b50b S |
1555 | } |
1556 | ||
1557 | /* | |
1558 | * If the host does not like our capabilities, | |
1559 | * fail the probe function. | |
1560 | */ | |
1561 | if (dm_device.state == DM_INIT_ERROR) { | |
1562 | ret = -ETIMEDOUT; | |
33080c1c | 1563 | goto probe_error2; |
9aa8b50b S |
1564 | } |
1565 | ||
1566 | dm_device.state = DM_INITIALIZED; | |
1567 | ||
1568 | return 0; | |
1569 | ||
33080c1c | 1570 | probe_error2: |
1cac8cd4 S |
1571 | #ifdef CONFIG_MEMORY_HOTPLUG |
1572 | restore_online_page_callback(&hv_online_page); | |
1573 | #endif | |
9aa8b50b S |
1574 | kthread_stop(dm_device.thread); |
1575 | ||
33080c1c | 1576 | probe_error1: |
9aa8b50b | 1577 | vmbus_close(dev->channel); |
33080c1c S |
1578 | probe_error0: |
1579 | kfree(send_buffer); | |
9aa8b50b S |
1580 | return ret; |
1581 | } | |
1582 | ||
1583 | static int balloon_remove(struct hv_device *dev) | |
1584 | { | |
1585 | struct hv_dynmem_device *dm = hv_get_drvdata(dev); | |
1cac8cd4 S |
1586 | struct list_head *cur, *tmp; |
1587 | struct hv_hotadd_state *has; | |
9aa8b50b S |
1588 | |
1589 | if (dm->num_pages_ballooned != 0) | |
1590 | pr_warn("Ballooned pages: %d\n", dm->num_pages_ballooned); | |
1591 | ||
6571b2da | 1592 | cancel_work_sync(&dm->balloon_wrk.wrk); |
c51af826 | 1593 | cancel_work_sync(&dm->ha_wrk.wrk); |
1cac8cd4 | 1594 | |
9aa8b50b S |
1595 | vmbus_close(dev->channel); |
1596 | kthread_stop(dm->thread); | |
33080c1c | 1597 | kfree(send_buffer); |
1cac8cd4 S |
1598 | #ifdef CONFIG_MEMORY_HOTPLUG |
1599 | restore_online_page_callback(&hv_online_page); | |
22f88475 | 1600 | unregister_memory_notifier(&hv_memory_nb); |
1cac8cd4 S |
1601 | #endif |
1602 | list_for_each_safe(cur, tmp, &dm->ha_region_list) { | |
1603 | has = list_entry(cur, struct hv_hotadd_state, list); | |
1604 | list_del(&has->list); | |
1605 | kfree(has); | |
1606 | } | |
9aa8b50b S |
1607 | |
1608 | return 0; | |
1609 | } | |
1610 | ||
1611 | static const struct hv_vmbus_device_id id_table[] = { | |
1612 | /* Dynamic Memory Class ID */ | |
1613 | /* 525074DC-8985-46e2-8057-A307DC18A502 */ | |
d13984e5 | 1614 | { HV_DM_GUID, }, |
9aa8b50b S |
1615 | { }, |
1616 | }; | |
1617 | ||
1618 | MODULE_DEVICE_TABLE(vmbus, id_table); | |
1619 | ||
1620 | static struct hv_driver balloon_drv = { | |
1621 | .name = "hv_balloon", | |
1622 | .id_table = id_table, | |
1623 | .probe = balloon_probe, | |
1624 | .remove = balloon_remove, | |
1625 | }; | |
1626 | ||
1627 | static int __init init_balloon_drv(void) | |
1628 | { | |
1629 | ||
1630 | return vmbus_driver_register(&balloon_drv); | |
1631 | } | |
1632 | ||
9aa8b50b | 1633 | module_init(init_balloon_drv); |
9aa8b50b S |
1634 | |
1635 | MODULE_DESCRIPTION("Hyper-V Balloon"); | |
9aa8b50b | 1636 | MODULE_LICENSE("GPL"); |