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