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43aa3132 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
9aa8b50b S |
2 | /* |
3 | * Copyright (c) 2012, Microsoft Corporation. | |
4 | * | |
5 | * Author: | |
6 | * K. Y. Srinivasan <kys@microsoft.com> | |
9aa8b50b S |
7 | */ |
8 | ||
9 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt | |
10 | ||
11 | #include <linux/kernel.h> | |
ae339336 | 12 | #include <linux/jiffies.h> |
9aa8b50b S |
13 | #include <linux/mman.h> |
14 | #include <linux/delay.h> | |
15 | #include <linux/init.h> | |
16 | #include <linux/module.h> | |
17 | #include <linux/slab.h> | |
18 | #include <linux/kthread.h> | |
19 | #include <linux/completion.h> | |
20 | #include <linux/memory_hotplug.h> | |
21 | #include <linux/memory.h> | |
22 | #include <linux/notifier.h> | |
9aa8b50b | 23 | #include <linux/percpu_counter.h> |
6dc2a774 | 24 | #include <linux/page_reporting.h> |
9aa8b50b S |
25 | |
26 | #include <linux/hyperv.h> | |
2af5e7b7 | 27 | #include <asm/hyperv-tlfs.h> |
9aa8b50b | 28 | |
25bd2b2f DC |
29 | #include <asm/mshyperv.h> |
30 | ||
cf21be91 VK |
31 | #define CREATE_TRACE_POINTS |
32 | #include "hv_trace_balloon.h" | |
33 | ||
9aa8b50b S |
34 | /* |
35 | * We begin with definitions supporting the Dynamic Memory protocol | |
36 | * with the host. | |
37 | * | |
38 | * Begin protocol definitions. | |
39 | */ | |
40 | ||
41 | ||
42 | ||
43 | /* | |
44 | * Protocol versions. The low word is the minor version, the high word the major | |
45 | * version. | |
46 | * | |
47 | * History: | |
48 | * Initial version 1.0 | |
49 | * Changed to 0.1 on 2009/03/25 | |
50 | * Changes to 0.2 on 2009/05/14 | |
51 | * Changes to 0.3 on 2009/12/03 | |
52 | * Changed to 1.0 on 2011/04/05 | |
53 | */ | |
54 | ||
55 | #define DYNMEM_MAKE_VERSION(Major, Minor) ((__u32)(((Major) << 16) | (Minor))) | |
56 | #define DYNMEM_MAJOR_VERSION(Version) ((__u32)(Version) >> 16) | |
57 | #define DYNMEM_MINOR_VERSION(Version) ((__u32)(Version) & 0xff) | |
58 | ||
59 | enum { | |
60 | DYNMEM_PROTOCOL_VERSION_1 = DYNMEM_MAKE_VERSION(0, 3), | |
61 | DYNMEM_PROTOCOL_VERSION_2 = DYNMEM_MAKE_VERSION(1, 0), | |
b6ddeae1 | 62 | DYNMEM_PROTOCOL_VERSION_3 = DYNMEM_MAKE_VERSION(2, 0), |
9aa8b50b S |
63 | |
64 | DYNMEM_PROTOCOL_VERSION_WIN7 = DYNMEM_PROTOCOL_VERSION_1, | |
65 | DYNMEM_PROTOCOL_VERSION_WIN8 = DYNMEM_PROTOCOL_VERSION_2, | |
b6ddeae1 | 66 | DYNMEM_PROTOCOL_VERSION_WIN10 = DYNMEM_PROTOCOL_VERSION_3, |
9aa8b50b | 67 | |
b6ddeae1 | 68 | DYNMEM_PROTOCOL_VERSION_CURRENT = DYNMEM_PROTOCOL_VERSION_WIN10 |
9aa8b50b S |
69 | }; |
70 | ||
71 | ||
72 | ||
73 | /* | |
74 | * Message Types | |
75 | */ | |
76 | ||
77 | enum dm_message_type { | |
78 | /* | |
79 | * Version 0.3 | |
80 | */ | |
81 | DM_ERROR = 0, | |
82 | DM_VERSION_REQUEST = 1, | |
83 | DM_VERSION_RESPONSE = 2, | |
84 | DM_CAPABILITIES_REPORT = 3, | |
85 | DM_CAPABILITIES_RESPONSE = 4, | |
86 | DM_STATUS_REPORT = 5, | |
87 | DM_BALLOON_REQUEST = 6, | |
88 | DM_BALLOON_RESPONSE = 7, | |
89 | DM_UNBALLOON_REQUEST = 8, | |
90 | DM_UNBALLOON_RESPONSE = 9, | |
91 | DM_MEM_HOT_ADD_REQUEST = 10, | |
92 | DM_MEM_HOT_ADD_RESPONSE = 11, | |
93 | DM_VERSION_03_MAX = 11, | |
94 | /* | |
95 | * Version 1.0. | |
96 | */ | |
97 | DM_INFO_MESSAGE = 12, | |
98 | DM_VERSION_1_MAX = 12 | |
99 | }; | |
100 | ||
101 | ||
102 | /* | |
103 | * Structures defining the dynamic memory management | |
104 | * protocol. | |
105 | */ | |
106 | ||
107 | union dm_version { | |
108 | struct { | |
109 | __u16 minor_version; | |
110 | __u16 major_version; | |
111 | }; | |
112 | __u32 version; | |
113 | } __packed; | |
114 | ||
115 | ||
116 | union dm_caps { | |
117 | struct { | |
118 | __u64 balloon:1; | |
119 | __u64 hot_add:1; | |
647965a2 S |
120 | /* |
121 | * To support guests that may have alignment | |
122 | * limitations on hot-add, the guest can specify | |
123 | * its alignment requirements; a value of n | |
124 | * represents an alignment of 2^n in mega bytes. | |
125 | */ | |
126 | __u64 hot_add_alignment:4; | |
127 | __u64 reservedz:58; | |
9aa8b50b S |
128 | } cap_bits; |
129 | __u64 caps; | |
130 | } __packed; | |
131 | ||
132 | union dm_mem_page_range { | |
133 | struct { | |
134 | /* | |
135 | * The PFN number of the first page in the range. | |
136 | * 40 bits is the architectural limit of a PFN | |
137 | * number for AMD64. | |
138 | */ | |
139 | __u64 start_page:40; | |
140 | /* | |
141 | * The number of pages in the range. | |
142 | */ | |
143 | __u64 page_cnt:24; | |
144 | } finfo; | |
145 | __u64 page_range; | |
146 | } __packed; | |
147 | ||
148 | ||
149 | ||
150 | /* | |
151 | * The header for all dynamic memory messages: | |
152 | * | |
153 | * type: Type of the message. | |
154 | * size: Size of the message in bytes; including the header. | |
155 | * trans_id: The guest is responsible for manufacturing this ID. | |
156 | */ | |
157 | ||
158 | struct dm_header { | |
159 | __u16 type; | |
160 | __u16 size; | |
161 | __u32 trans_id; | |
162 | } __packed; | |
163 | ||
164 | /* | |
165 | * A generic message format for dynamic memory. | |
166 | * Specific message formats are defined later in the file. | |
167 | */ | |
168 | ||
169 | struct dm_message { | |
170 | struct dm_header hdr; | |
171 | __u8 data[]; /* enclosed message */ | |
172 | } __packed; | |
173 | ||
174 | ||
175 | /* | |
176 | * Specific message types supporting the dynamic memory protocol. | |
177 | */ | |
178 | ||
179 | /* | |
180 | * Version negotiation message. Sent from the guest to the host. | |
181 | * The guest is free to try different versions until the host | |
182 | * accepts the version. | |
183 | * | |
184 | * dm_version: The protocol version requested. | |
185 | * is_last_attempt: If TRUE, this is the last version guest will request. | |
186 | * reservedz: Reserved field, set to zero. | |
187 | */ | |
188 | ||
189 | struct dm_version_request { | |
190 | struct dm_header hdr; | |
191 | union dm_version version; | |
192 | __u32 is_last_attempt:1; | |
193 | __u32 reservedz:31; | |
194 | } __packed; | |
195 | ||
196 | /* | |
197 | * Version response message; Host to Guest and indicates | |
198 | * if the host has accepted the version sent by the guest. | |
199 | * | |
200 | * is_accepted: If TRUE, host has accepted the version and the guest | |
201 | * should proceed to the next stage of the protocol. FALSE indicates that | |
202 | * guest should re-try with a different version. | |
203 | * | |
204 | * reservedz: Reserved field, set to zero. | |
205 | */ | |
206 | ||
207 | struct dm_version_response { | |
208 | struct dm_header hdr; | |
209 | __u64 is_accepted:1; | |
210 | __u64 reservedz:63; | |
211 | } __packed; | |
212 | ||
213 | /* | |
214 | * Message reporting capabilities. This is sent from the guest to the | |
215 | * host. | |
216 | */ | |
217 | ||
218 | struct dm_capabilities { | |
219 | struct dm_header hdr; | |
220 | union dm_caps caps; | |
221 | __u64 min_page_cnt; | |
222 | __u64 max_page_number; | |
223 | } __packed; | |
224 | ||
225 | /* | |
226 | * Response to the capabilities message. This is sent from the host to the | |
227 | * guest. This message notifies if the host has accepted the guest's | |
228 | * capabilities. If the host has not accepted, the guest must shutdown | |
229 | * the service. | |
230 | * | |
231 | * is_accepted: Indicates if the host has accepted guest's capabilities. | |
232 | * reservedz: Must be 0. | |
233 | */ | |
234 | ||
235 | struct dm_capabilities_resp_msg { | |
236 | struct dm_header hdr; | |
237 | __u64 is_accepted:1; | |
238 | __u64 reservedz:63; | |
239 | } __packed; | |
240 | ||
241 | /* | |
242 | * This message is used to report memory pressure from the guest. | |
243 | * This message is not part of any transaction and there is no | |
244 | * response to this message. | |
245 | * | |
246 | * num_avail: Available memory in pages. | |
247 | * num_committed: Committed memory in pages. | |
248 | * page_file_size: The accumulated size of all page files | |
249 | * in the system in pages. | |
250 | * zero_free: The nunber of zero and free pages. | |
251 | * page_file_writes: The writes to the page file in pages. | |
252 | * io_diff: An indicator of file cache efficiency or page file activity, | |
253 | * calculated as File Cache Page Fault Count - Page Read Count. | |
254 | * This value is in pages. | |
255 | * | |
256 | * Some of these metrics are Windows specific and fortunately | |
257 | * the algorithm on the host side that computes the guest memory | |
258 | * pressure only uses num_committed value. | |
259 | */ | |
260 | ||
261 | struct dm_status { | |
262 | struct dm_header hdr; | |
263 | __u64 num_avail; | |
264 | __u64 num_committed; | |
265 | __u64 page_file_size; | |
266 | __u64 zero_free; | |
267 | __u32 page_file_writes; | |
268 | __u32 io_diff; | |
269 | } __packed; | |
270 | ||
271 | ||
272 | /* | |
273 | * Message to ask the guest to allocate memory - balloon up message. | |
274 | * This message is sent from the host to the guest. The guest may not be | |
275 | * able to allocate as much memory as requested. | |
276 | * | |
277 | * num_pages: number of pages to allocate. | |
278 | */ | |
279 | ||
280 | struct dm_balloon { | |
281 | struct dm_header hdr; | |
282 | __u32 num_pages; | |
283 | __u32 reservedz; | |
284 | } __packed; | |
285 | ||
286 | ||
287 | /* | |
288 | * Balloon response message; this message is sent from the guest | |
289 | * to the host in response to the balloon message. | |
290 | * | |
291 | * reservedz: Reserved; must be set to zero. | |
292 | * more_pages: If FALSE, this is the last message of the transaction. | |
293 | * if TRUE there will atleast one more message from the guest. | |
294 | * | |
295 | * range_count: The number of ranges in the range array. | |
296 | * | |
297 | * range_array: An array of page ranges returned to the host. | |
298 | * | |
299 | */ | |
300 | ||
301 | struct dm_balloon_response { | |
302 | struct dm_header hdr; | |
303 | __u32 reservedz; | |
304 | __u32 more_pages:1; | |
305 | __u32 range_count:31; | |
306 | union dm_mem_page_range range_array[]; | |
307 | } __packed; | |
308 | ||
309 | /* | |
310 | * Un-balloon message; this message is sent from the host | |
311 | * to the guest to give guest more memory. | |
312 | * | |
313 | * more_pages: If FALSE, this is the last message of the transaction. | |
314 | * if TRUE there will atleast one more message from the guest. | |
315 | * | |
316 | * reservedz: Reserved; must be set to zero. | |
317 | * | |
318 | * range_count: The number of ranges in the range array. | |
319 | * | |
320 | * range_array: An array of page ranges returned to the host. | |
321 | * | |
322 | */ | |
323 | ||
324 | struct dm_unballoon_request { | |
325 | struct dm_header hdr; | |
326 | __u32 more_pages:1; | |
327 | __u32 reservedz:31; | |
328 | __u32 range_count; | |
329 | union dm_mem_page_range range_array[]; | |
330 | } __packed; | |
331 | ||
332 | /* | |
333 | * Un-balloon response message; this message is sent from the guest | |
334 | * to the host in response to an unballoon request. | |
335 | * | |
336 | */ | |
337 | ||
338 | struct dm_unballoon_response { | |
339 | struct dm_header hdr; | |
340 | } __packed; | |
341 | ||
342 | ||
343 | /* | |
344 | * Hot add request message. Message sent from the host to the guest. | |
345 | * | |
346 | * mem_range: Memory range to hot add. | |
347 | * | |
9aa8b50b S |
348 | */ |
349 | ||
350 | struct dm_hot_add { | |
351 | struct dm_header hdr; | |
352 | union dm_mem_page_range range; | |
353 | } __packed; | |
354 | ||
355 | /* | |
356 | * Hot add response message. | |
357 | * This message is sent by the guest to report the status of a hot add request. | |
358 | * If page_count is less than the requested page count, then the host should | |
359 | * assume all further hot add requests will fail, since this indicates that | |
360 | * the guest has hit an upper physical memory barrier. | |
361 | * | |
362 | * Hot adds may also fail due to low resources; in this case, the guest must | |
363 | * not complete this message until the hot add can succeed, and the host must | |
364 | * not send a new hot add request until the response is sent. | |
365 | * If VSC fails to hot add memory DYNMEM_NUMBER_OF_UNSUCCESSFUL_HOTADD_ATTEMPTS | |
366 | * times it fails the request. | |
367 | * | |
368 | * | |
369 | * page_count: number of pages that were successfully hot added. | |
370 | * | |
371 | * result: result of the operation 1: success, 0: failure. | |
372 | * | |
373 | */ | |
374 | ||
375 | struct dm_hot_add_response { | |
376 | struct dm_header hdr; | |
377 | __u32 page_count; | |
378 | __u32 result; | |
379 | } __packed; | |
380 | ||
381 | /* | |
382 | * Types of information sent from host to the guest. | |
383 | */ | |
384 | ||
385 | enum dm_info_type { | |
386 | INFO_TYPE_MAX_PAGE_CNT = 0, | |
387 | MAX_INFO_TYPE | |
388 | }; | |
389 | ||
390 | ||
391 | /* | |
392 | * Header for the information message. | |
393 | */ | |
394 | ||
395 | struct dm_info_header { | |
396 | enum dm_info_type type; | |
397 | __u32 data_size; | |
398 | } __packed; | |
399 | ||
400 | /* | |
401 | * This message is sent from the host to the guest to pass | |
402 | * some relevant information (win8 addition). | |
403 | * | |
404 | * reserved: no used. | |
405 | * info_size: size of the information blob. | |
406 | * info: information blob. | |
407 | */ | |
408 | ||
409 | struct dm_info_msg { | |
6427a0d7 | 410 | struct dm_header hdr; |
9aa8b50b S |
411 | __u32 reserved; |
412 | __u32 info_size; | |
413 | __u8 info[]; | |
414 | }; | |
415 | ||
416 | /* | |
417 | * End protocol definitions. | |
418 | */ | |
419 | ||
1cac8cd4 S |
420 | /* |
421 | * State to manage hot adding memory into the guest. | |
422 | * The range start_pfn : end_pfn specifies the range | |
423 | * that the host has asked us to hot add. The range | |
424 | * start_pfn : ha_end_pfn specifies the range that we have | |
425 | * currently hot added. We hot add in multiples of 128M | |
426 | * chunks; it is possible that we may not be able to bring | |
427 | * online all the pages in the region. The range | |
7cf3b79e | 428 | * covered_start_pfn:covered_end_pfn defines the pages that can |
1cac8cd4 S |
429 | * be brough online. |
430 | */ | |
431 | ||
432 | struct hv_hotadd_state { | |
433 | struct list_head list; | |
434 | unsigned long start_pfn; | |
7cf3b79e | 435 | unsigned long covered_start_pfn; |
1cac8cd4 S |
436 | unsigned long covered_end_pfn; |
437 | unsigned long ha_end_pfn; | |
438 | unsigned long end_pfn; | |
cb7a5724 VK |
439 | /* |
440 | * A list of gaps. | |
441 | */ | |
442 | struct list_head gap_list; | |
443 | }; | |
444 | ||
445 | struct hv_hotadd_gap { | |
446 | struct list_head list; | |
447 | unsigned long start_pfn; | |
448 | unsigned long end_pfn; | |
1cac8cd4 S |
449 | }; |
450 | ||
6571b2da S |
451 | struct balloon_state { |
452 | __u32 num_pages; | |
453 | struct work_struct wrk; | |
454 | }; | |
455 | ||
c51af826 S |
456 | struct hot_add_wrk { |
457 | union dm_mem_page_range ha_page_range; | |
1cac8cd4 | 458 | union dm_mem_page_range ha_region_range; |
c51af826 S |
459 | struct work_struct wrk; |
460 | }; | |
461 | ||
25bd2b2f | 462 | static bool allow_hibernation; |
1cac8cd4 | 463 | static bool hot_add = true; |
9aa8b50b | 464 | static bool do_hot_add; |
e500d158 S |
465 | /* |
466 | * Delay reporting memory pressure by | |
467 | * the specified number of seconds. | |
468 | */ | |
1cac8cd4 | 469 | static uint pressure_report_delay = 45; |
9aa8b50b | 470 | |
ae339336 S |
471 | /* |
472 | * The last time we posted a pressure report to host. | |
473 | */ | |
474 | static unsigned long last_post_time; | |
475 | ||
9aa8b50b S |
476 | module_param(hot_add, bool, (S_IRUGO | S_IWUSR)); |
477 | MODULE_PARM_DESC(hot_add, "If set attempt memory hot_add"); | |
478 | ||
e500d158 S |
479 | module_param(pressure_report_delay, uint, (S_IRUGO | S_IWUSR)); |
480 | MODULE_PARM_DESC(pressure_report_delay, "Delay in secs in reporting pressure"); | |
9aa8b50b S |
481 | static atomic_t trans_id = ATOMIC_INIT(0); |
482 | ||
8cf37526 | 483 | static int dm_ring_size = VMBUS_RING_SIZE(16 * 1024); |
9aa8b50b S |
484 | |
485 | /* | |
486 | * Driver specific state. | |
487 | */ | |
488 | ||
489 | enum hv_dm_state { | |
490 | DM_INITIALIZING = 0, | |
491 | DM_INITIALIZED, | |
492 | DM_BALLOON_UP, | |
493 | DM_BALLOON_DOWN, | |
494 | DM_HOT_ADD, | |
495 | DM_INIT_ERROR | |
496 | }; | |
497 | ||
498 | ||
2af5e7b7 HP |
499 | static __u8 recv_buffer[HV_HYP_PAGE_SIZE]; |
500 | static __u8 balloon_up_send_buffer[HV_HYP_PAGE_SIZE]; | |
501 | #define PAGES_IN_2M (2 * 1024 * 1024 / PAGE_SIZE) | |
502 | #define HA_CHUNK (128 * 1024 * 1024 / PAGE_SIZE) | |
9aa8b50b S |
503 | |
504 | struct hv_dynmem_device { | |
505 | struct hv_device *dev; | |
506 | enum hv_dm_state state; | |
507 | struct completion host_event; | |
508 | struct completion config_event; | |
509 | ||
510 | /* | |
511 | * Number of pages we have currently ballooned out. | |
512 | */ | |
513 | unsigned int num_pages_ballooned; | |
549fd280 VK |
514 | unsigned int num_pages_onlined; |
515 | unsigned int num_pages_added; | |
9aa8b50b S |
516 | |
517 | /* | |
6571b2da S |
518 | * State to manage the ballooning (up) operation. |
519 | */ | |
520 | struct balloon_state balloon_wrk; | |
521 | ||
c51af826 S |
522 | /* |
523 | * State to execute the "hot-add" operation. | |
524 | */ | |
525 | struct hot_add_wrk ha_wrk; | |
526 | ||
1cac8cd4 S |
527 | /* |
528 | * This state tracks if the host has specified a hot-add | |
529 | * region. | |
530 | */ | |
531 | bool host_specified_ha_region; | |
532 | ||
533 | /* | |
534 | * State to synchronize hot-add. | |
535 | */ | |
536 | struct completion ol_waitevent; | |
6571b2da S |
537 | /* |
538 | * This thread handles hot-add | |
9aa8b50b S |
539 | * requests from the host as well as notifying |
540 | * the host with regards to memory pressure in | |
541 | * the guest. | |
542 | */ | |
543 | struct task_struct *thread; | |
544 | ||
eece30b9 VK |
545 | /* |
546 | * Protects ha_region_list, num_pages_onlined counter and individual | |
547 | * regions from ha_region_list. | |
548 | */ | |
549 | spinlock_t ha_lock; | |
22f88475 | 550 | |
1cac8cd4 S |
551 | /* |
552 | * A list of hot-add regions. | |
553 | */ | |
554 | struct list_head ha_region_list; | |
555 | ||
9aa8b50b S |
556 | /* |
557 | * We start with the highest version we can support | |
558 | * and downgrade based on the host; we save here the | |
559 | * next version to try. | |
560 | */ | |
561 | __u32 next_version; | |
b3bb97b8 AN |
562 | |
563 | /* | |
564 | * The negotiated version agreed by host. | |
565 | */ | |
566 | __u32 version; | |
6dc2a774 SM |
567 | |
568 | struct page_reporting_dev_info pr_dev_info; | |
9aa8b50b S |
569 | }; |
570 | ||
571 | static struct hv_dynmem_device dm_device; | |
572 | ||
ae339336 | 573 | static void post_status(struct hv_dynmem_device *dm); |
22f88475 | 574 | |
1cac8cd4 | 575 | #ifdef CONFIG_MEMORY_HOTPLUG |
bba072d1 VK |
576 | static inline bool has_pfn_is_backed(struct hv_hotadd_state *has, |
577 | unsigned long pfn) | |
578 | { | |
579 | struct hv_hotadd_gap *gap; | |
580 | ||
581 | /* The page is not backed. */ | |
582 | if ((pfn < has->covered_start_pfn) || (pfn >= has->covered_end_pfn)) | |
583 | return false; | |
584 | ||
585 | /* Check for gaps. */ | |
586 | list_for_each_entry(gap, &has->gap_list, list) { | |
587 | if ((pfn >= gap->start_pfn) && (pfn < gap->end_pfn)) | |
588 | return false; | |
589 | } | |
590 | ||
591 | return true; | |
592 | } | |
593 | ||
594 | static unsigned long hv_page_offline_check(unsigned long start_pfn, | |
595 | unsigned long nr_pages) | |
596 | { | |
597 | unsigned long pfn = start_pfn, count = 0; | |
598 | struct hv_hotadd_state *has; | |
599 | bool found; | |
600 | ||
601 | while (pfn < start_pfn + nr_pages) { | |
602 | /* | |
603 | * Search for HAS which covers the pfn and when we find one | |
604 | * count how many consequitive PFNs are covered. | |
605 | */ | |
606 | found = false; | |
607 | list_for_each_entry(has, &dm_device.ha_region_list, list) { | |
608 | while ((pfn >= has->start_pfn) && | |
609 | (pfn < has->end_pfn) && | |
610 | (pfn < start_pfn + nr_pages)) { | |
611 | found = true; | |
612 | if (has_pfn_is_backed(has, pfn)) | |
613 | count++; | |
614 | pfn++; | |
615 | } | |
616 | } | |
617 | ||
618 | /* | |
619 | * This PFN is not in any HAS (e.g. we're offlining a region | |
620 | * which was present at boot), no need to account for it. Go | |
621 | * to the next one. | |
622 | */ | |
623 | if (!found) | |
624 | pfn++; | |
625 | } | |
626 | ||
627 | return count; | |
628 | } | |
629 | ||
22f88475 S |
630 | static int hv_memory_notifier(struct notifier_block *nb, unsigned long val, |
631 | void *v) | |
632 | { | |
549fd280 | 633 | struct memory_notify *mem = (struct memory_notify *)v; |
bba072d1 | 634 | unsigned long flags, pfn_count; |
549fd280 | 635 | |
22f88475 | 636 | switch (val) { |
22f88475 S |
637 | case MEM_ONLINE: |
638 | case MEM_CANCEL_ONLINE: | |
bc58ebd5 | 639 | complete(&dm_device.ol_waitevent); |
22f88475 S |
640 | break; |
641 | ||
22f88475 | 642 | case MEM_OFFLINE: |
eece30b9 | 643 | spin_lock_irqsave(&dm_device.ha_lock, flags); |
bba072d1 VK |
644 | pfn_count = hv_page_offline_check(mem->start_pfn, |
645 | mem->nr_pages); | |
646 | if (pfn_count <= dm_device.num_pages_onlined) { | |
647 | dm_device.num_pages_onlined -= pfn_count; | |
648 | } else { | |
649 | /* | |
650 | * We're offlining more pages than we managed to online. | |
651 | * This is unexpected. In any case don't let | |
652 | * num_pages_onlined wrap around zero. | |
653 | */ | |
654 | WARN_ON_ONCE(1); | |
655 | dm_device.num_pages_onlined = 0; | |
656 | } | |
eece30b9 | 657 | spin_unlock_irqrestore(&dm_device.ha_lock, flags); |
549fd280 | 658 | break; |
eece30b9 | 659 | case MEM_GOING_ONLINE: |
549fd280 | 660 | case MEM_GOING_OFFLINE: |
22f88475 S |
661 | case MEM_CANCEL_OFFLINE: |
662 | break; | |
663 | } | |
664 | return NOTIFY_OK; | |
665 | } | |
666 | ||
667 | static struct notifier_block hv_memory_nb = { | |
668 | .notifier_call = hv_memory_notifier, | |
669 | .priority = 0 | |
670 | }; | |
671 | ||
cb7a5724 VK |
672 | /* Check if the particular page is backed and can be onlined and online it. */ |
673 | static void hv_page_online_one(struct hv_hotadd_state *has, struct page *pg) | |
674 | { | |
fae42c4d DH |
675 | if (!has_pfn_is_backed(has, page_to_pfn(pg))) { |
676 | if (!PageOffline(pg)) | |
677 | __SetPageOffline(pg); | |
cb7a5724 | 678 | return; |
fae42c4d DH |
679 | } |
680 | if (PageOffline(pg)) | |
681 | __ClearPageOffline(pg); | |
cb7a5724 | 682 | |
cb7a5724 | 683 | /* This frame is currently backed; online the page. */ |
30a9c246 | 684 | generic_online_page(pg, 0); |
6df8d9aa | 685 | |
1c87dc89 | 686 | lockdep_assert_held(&dm_device.ha_lock); |
6df8d9aa | 687 | dm_device.num_pages_onlined++; |
cb7a5724 VK |
688 | } |
689 | ||
690 | static void hv_bring_pgs_online(struct hv_hotadd_state *has, | |
691 | unsigned long start_pfn, unsigned long size) | |
9aa8b50b | 692 | { |
1cac8cd4 | 693 | int i; |
9aa8b50b | 694 | |
b3bb97b8 | 695 | pr_debug("Online %lu pages starting at pfn 0x%lx\n", size, start_pfn); |
cb7a5724 VK |
696 | for (i = 0; i < size; i++) |
697 | hv_page_online_one(has, pfn_to_page(start_pfn + i)); | |
1cac8cd4 S |
698 | } |
699 | ||
700 | static void hv_mem_hot_add(unsigned long start, unsigned long size, | |
701 | unsigned long pfn_count, | |
702 | struct hv_hotadd_state *has) | |
703 | { | |
704 | int ret = 0; | |
ed07ec93 | 705 | int i, nid; |
1cac8cd4 S |
706 | unsigned long start_pfn; |
707 | unsigned long processed_pfn; | |
708 | unsigned long total_pfn = pfn_count; | |
eece30b9 | 709 | unsigned long flags; |
1cac8cd4 S |
710 | |
711 | for (i = 0; i < (size/HA_CHUNK); i++) { | |
712 | start_pfn = start + (i * HA_CHUNK); | |
eece30b9 VK |
713 | |
714 | spin_lock_irqsave(&dm_device.ha_lock, flags); | |
1cac8cd4 S |
715 | has->ha_end_pfn += HA_CHUNK; |
716 | ||
717 | if (total_pfn > HA_CHUNK) { | |
718 | processed_pfn = HA_CHUNK; | |
719 | total_pfn -= HA_CHUNK; | |
720 | } else { | |
721 | processed_pfn = total_pfn; | |
722 | total_pfn = 0; | |
723 | } | |
724 | ||
725 | has->covered_end_pfn += processed_pfn; | |
eece30b9 | 726 | spin_unlock_irqrestore(&dm_device.ha_lock, flags); |
9aa8b50b | 727 | |
bc58ebd5 | 728 | reinit_completion(&dm_device.ol_waitevent); |
9aa8b50b | 729 | |
1cac8cd4 S |
730 | nid = memory_add_physaddr_to_nid(PFN_PHYS(start_pfn)); |
731 | ret = add_memory(nid, PFN_PHYS((start_pfn)), | |
26011267 | 732 | (HA_CHUNK << PAGE_SHIFT), MHP_MERGE_RESOURCE); |
1cac8cd4 S |
733 | |
734 | if (ret) { | |
223e1e4d | 735 | pr_err("hot_add memory failed error is %d\n", ret); |
7f4f2302 S |
736 | if (ret == -EEXIST) { |
737 | /* | |
738 | * This error indicates that the error | |
739 | * is not a transient failure. This is the | |
740 | * case where the guest's physical address map | |
741 | * precludes hot adding memory. Stop all further | |
742 | * memory hot-add. | |
743 | */ | |
744 | do_hot_add = false; | |
745 | } | |
eece30b9 | 746 | spin_lock_irqsave(&dm_device.ha_lock, flags); |
1cac8cd4 S |
747 | has->ha_end_pfn -= HA_CHUNK; |
748 | has->covered_end_pfn -= processed_pfn; | |
eece30b9 | 749 | spin_unlock_irqrestore(&dm_device.ha_lock, flags); |
1cac8cd4 S |
750 | break; |
751 | } | |
9aa8b50b S |
752 | |
753 | /* | |
bc58ebd5 DH |
754 | * Wait for memory to get onlined. If the kernel onlined the |
755 | * memory when adding it, this will return directly. Otherwise, | |
756 | * it will wait for user space to online the memory. This helps | |
757 | * to avoid adding memory faster than it is getting onlined. As | |
758 | * adding succeeded, it is ok to proceed even if the memory was | |
759 | * not onlined in time. | |
9aa8b50b | 760 | */ |
bc58ebd5 | 761 | wait_for_completion_timeout(&dm_device.ol_waitevent, 5 * HZ); |
ae339336 | 762 | post_status(&dm_device); |
9aa8b50b | 763 | } |
1cac8cd4 S |
764 | } |
765 | ||
a9cd410a | 766 | static void hv_online_page(struct page *pg, unsigned int order) |
1cac8cd4 | 767 | { |
1cac8cd4 | 768 | struct hv_hotadd_state *has; |
eece30b9 | 769 | unsigned long flags; |
4f098af5 | 770 | unsigned long pfn = page_to_pfn(pg); |
1cac8cd4 | 771 | |
eece30b9 VK |
772 | spin_lock_irqsave(&dm_device.ha_lock, flags); |
773 | list_for_each_entry(has, &dm_device.ha_region_list, list) { | |
cb7a5724 | 774 | /* The page belongs to a different HAS. */ |
a9cd410a AK |
775 | if ((pfn < has->start_pfn) || |
776 | (pfn + (1UL << order) > has->end_pfn)) | |
cb7a5724 VK |
777 | continue; |
778 | ||
a9cd410a | 779 | hv_bring_pgs_online(has, pfn, 1UL << order); |
cb7a5724 | 780 | break; |
1cac8cd4 | 781 | } |
eece30b9 | 782 | spin_unlock_irqrestore(&dm_device.ha_lock, flags); |
1cac8cd4 S |
783 | } |
784 | ||
cb7a5724 | 785 | static int pfn_covered(unsigned long start_pfn, unsigned long pfn_cnt) |
1cac8cd4 | 786 | { |
1cac8cd4 | 787 | struct hv_hotadd_state *has; |
cb7a5724 | 788 | struct hv_hotadd_gap *gap; |
1cac8cd4 | 789 | unsigned long residual, new_inc; |
eece30b9 VK |
790 | int ret = 0; |
791 | unsigned long flags; | |
1cac8cd4 | 792 | |
eece30b9 VK |
793 | spin_lock_irqsave(&dm_device.ha_lock, flags); |
794 | list_for_each_entry(has, &dm_device.ha_region_list, list) { | |
1cac8cd4 S |
795 | /* |
796 | * If the pfn range we are dealing with is not in the current | |
797 | * "hot add block", move on. | |
798 | */ | |
77c0c973 | 799 | if (start_pfn < has->start_pfn || start_pfn >= has->end_pfn) |
1cac8cd4 | 800 | continue; |
cb7a5724 VK |
801 | |
802 | /* | |
803 | * If the current start pfn is not where the covered_end | |
804 | * is, create a gap and update covered_end_pfn. | |
805 | */ | |
806 | if (has->covered_end_pfn != start_pfn) { | |
807 | gap = kzalloc(sizeof(struct hv_hotadd_gap), GFP_ATOMIC); | |
eece30b9 VK |
808 | if (!gap) { |
809 | ret = -ENOMEM; | |
810 | break; | |
811 | } | |
cb7a5724 VK |
812 | |
813 | INIT_LIST_HEAD(&gap->list); | |
814 | gap->start_pfn = has->covered_end_pfn; | |
815 | gap->end_pfn = start_pfn; | |
816 | list_add_tail(&gap->list, &has->gap_list); | |
817 | ||
818 | has->covered_end_pfn = start_pfn; | |
819 | } | |
820 | ||
1cac8cd4 S |
821 | /* |
822 | * If the current hot add-request extends beyond | |
823 | * our current limit; extend it. | |
824 | */ | |
825 | if ((start_pfn + pfn_cnt) > has->end_pfn) { | |
826 | residual = (start_pfn + pfn_cnt - has->end_pfn); | |
827 | /* | |
828 | * Extend the region by multiples of HA_CHUNK. | |
829 | */ | |
830 | new_inc = (residual / HA_CHUNK) * HA_CHUNK; | |
831 | if (residual % HA_CHUNK) | |
832 | new_inc += HA_CHUNK; | |
833 | ||
834 | has->end_pfn += new_inc; | |
835 | } | |
836 | ||
eece30b9 VK |
837 | ret = 1; |
838 | break; | |
1cac8cd4 | 839 | } |
eece30b9 | 840 | spin_unlock_irqrestore(&dm_device.ha_lock, flags); |
1cac8cd4 | 841 | |
eece30b9 | 842 | return ret; |
1cac8cd4 S |
843 | } |
844 | ||
845 | static unsigned long handle_pg_range(unsigned long pg_start, | |
846 | unsigned long pg_count) | |
847 | { | |
848 | unsigned long start_pfn = pg_start; | |
849 | unsigned long pfn_cnt = pg_count; | |
850 | unsigned long size; | |
1cac8cd4 S |
851 | struct hv_hotadd_state *has; |
852 | unsigned long pgs_ol = 0; | |
853 | unsigned long old_covered_state; | |
eece30b9 | 854 | unsigned long res = 0, flags; |
1cac8cd4 | 855 | |
b3bb97b8 AN |
856 | pr_debug("Hot adding %lu pages starting at pfn 0x%lx.\n", pg_count, |
857 | pg_start); | |
858 | ||
eece30b9 VK |
859 | spin_lock_irqsave(&dm_device.ha_lock, flags); |
860 | list_for_each_entry(has, &dm_device.ha_region_list, list) { | |
1cac8cd4 S |
861 | /* |
862 | * If the pfn range we are dealing with is not in the current | |
863 | * "hot add block", move on. | |
864 | */ | |
77c0c973 | 865 | if (start_pfn < has->start_pfn || start_pfn >= has->end_pfn) |
1cac8cd4 S |
866 | continue; |
867 | ||
868 | old_covered_state = has->covered_end_pfn; | |
869 | ||
870 | if (start_pfn < has->ha_end_pfn) { | |
871 | /* | |
872 | * This is the case where we are backing pages | |
873 | * in an already hot added region. Bring | |
874 | * these pages online first. | |
875 | */ | |
876 | pgs_ol = has->ha_end_pfn - start_pfn; | |
877 | if (pgs_ol > pfn_cnt) | |
878 | pgs_ol = pfn_cnt; | |
d6cbd2c3 | 879 | |
cb7a5724 VK |
880 | has->covered_end_pfn += pgs_ol; |
881 | pfn_cnt -= pgs_ol; | |
d6cbd2c3 VK |
882 | /* |
883 | * Check if the corresponding memory block is already | |
da8ced36 VK |
884 | * online. It is possible to observe struct pages still |
885 | * being uninitialized here so check section instead. | |
886 | * In case the section is online we need to bring the | |
887 | * rest of pfns (which were not backed previously) | |
888 | * online too. | |
d6cbd2c3 VK |
889 | */ |
890 | if (start_pfn > has->start_pfn && | |
da8ced36 | 891 | online_section_nr(pfn_to_section_nr(start_pfn))) |
cb7a5724 | 892 | hv_bring_pgs_online(has, start_pfn, pgs_ol); |
d6cbd2c3 | 893 | |
1cac8cd4 S |
894 | } |
895 | ||
896 | if ((has->ha_end_pfn < has->end_pfn) && (pfn_cnt > 0)) { | |
897 | /* | |
898 | * We have some residual hot add range | |
899 | * that needs to be hot added; hot add | |
900 | * it now. Hot add a multiple of | |
901 | * of HA_CHUNK that fully covers the pages | |
902 | * we have. | |
903 | */ | |
904 | size = (has->end_pfn - has->ha_end_pfn); | |
905 | if (pfn_cnt <= size) { | |
906 | size = ((pfn_cnt / HA_CHUNK) * HA_CHUNK); | |
907 | if (pfn_cnt % HA_CHUNK) | |
908 | size += HA_CHUNK; | |
909 | } else { | |
910 | pfn_cnt = size; | |
911 | } | |
eece30b9 | 912 | spin_unlock_irqrestore(&dm_device.ha_lock, flags); |
1cac8cd4 | 913 | hv_mem_hot_add(has->ha_end_pfn, size, pfn_cnt, has); |
eece30b9 | 914 | spin_lock_irqsave(&dm_device.ha_lock, flags); |
1cac8cd4 S |
915 | } |
916 | /* | |
917 | * If we managed to online any pages that were given to us, | |
918 | * we declare success. | |
919 | */ | |
eece30b9 VK |
920 | res = has->covered_end_pfn - old_covered_state; |
921 | break; | |
1cac8cd4 | 922 | } |
eece30b9 | 923 | spin_unlock_irqrestore(&dm_device.ha_lock, flags); |
1cac8cd4 | 924 | |
eece30b9 | 925 | return res; |
1cac8cd4 S |
926 | } |
927 | ||
928 | static unsigned long process_hot_add(unsigned long pg_start, | |
929 | unsigned long pfn_cnt, | |
930 | unsigned long rg_start, | |
931 | unsigned long rg_size) | |
932 | { | |
933 | struct hv_hotadd_state *ha_region = NULL; | |
cb7a5724 | 934 | int covered; |
eece30b9 | 935 | unsigned long flags; |
1cac8cd4 S |
936 | |
937 | if (pfn_cnt == 0) | |
938 | return 0; | |
939 | ||
cb7a5724 VK |
940 | if (!dm_device.host_specified_ha_region) { |
941 | covered = pfn_covered(pg_start, pfn_cnt); | |
942 | if (covered < 0) | |
943 | return 0; | |
944 | ||
945 | if (covered) | |
1cac8cd4 | 946 | goto do_pg_range; |
cb7a5724 | 947 | } |
1cac8cd4 S |
948 | |
949 | /* | |
950 | * If the host has specified a hot-add range; deal with it first. | |
951 | */ | |
952 | ||
647965a2 | 953 | if (rg_size != 0) { |
1cac8cd4 S |
954 | ha_region = kzalloc(sizeof(struct hv_hotadd_state), GFP_KERNEL); |
955 | if (!ha_region) | |
956 | return 0; | |
957 | ||
958 | INIT_LIST_HEAD(&ha_region->list); | |
cb7a5724 | 959 | INIT_LIST_HEAD(&ha_region->gap_list); |
1cac8cd4 | 960 | |
1cac8cd4 S |
961 | ha_region->start_pfn = rg_start; |
962 | ha_region->ha_end_pfn = rg_start; | |
7cf3b79e | 963 | ha_region->covered_start_pfn = pg_start; |
1cac8cd4 S |
964 | ha_region->covered_end_pfn = pg_start; |
965 | ha_region->end_pfn = rg_start + rg_size; | |
eece30b9 VK |
966 | |
967 | spin_lock_irqsave(&dm_device.ha_lock, flags); | |
968 | list_add_tail(&ha_region->list, &dm_device.ha_region_list); | |
969 | spin_unlock_irqrestore(&dm_device.ha_lock, flags); | |
1cac8cd4 S |
970 | } |
971 | ||
972 | do_pg_range: | |
973 | /* | |
974 | * Process the page range specified; bringing them | |
975 | * online if possible. | |
976 | */ | |
977 | return handle_pg_range(pg_start, pfn_cnt); | |
978 | } | |
979 | ||
980 | #endif | |
981 | ||
982 | static void hot_add_req(struct work_struct *dummy) | |
983 | { | |
984 | struct dm_hot_add_response resp; | |
985 | #ifdef CONFIG_MEMORY_HOTPLUG | |
986 | unsigned long pg_start, pfn_cnt; | |
987 | unsigned long rg_start, rg_sz; | |
988 | #endif | |
989 | struct hv_dynmem_device *dm = &dm_device; | |
990 | ||
9aa8b50b S |
991 | memset(&resp, 0, sizeof(struct dm_hot_add_response)); |
992 | resp.hdr.type = DM_MEM_HOT_ADD_RESPONSE; | |
993 | resp.hdr.size = sizeof(struct dm_hot_add_response); | |
9aa8b50b | 994 | |
1cac8cd4 S |
995 | #ifdef CONFIG_MEMORY_HOTPLUG |
996 | pg_start = dm->ha_wrk.ha_page_range.finfo.start_page; | |
997 | pfn_cnt = dm->ha_wrk.ha_page_range.finfo.page_cnt; | |
9aa8b50b | 998 | |
1cac8cd4 S |
999 | rg_start = dm->ha_wrk.ha_region_range.finfo.start_page; |
1000 | rg_sz = dm->ha_wrk.ha_region_range.finfo.page_cnt; | |
1001 | ||
1002 | if ((rg_start == 0) && (!dm->host_specified_ha_region)) { | |
1003 | unsigned long region_size; | |
1004 | unsigned long region_start; | |
1005 | ||
1006 | /* | |
1007 | * The host has not specified the hot-add region. | |
1008 | * Based on the hot-add page range being specified, | |
1009 | * compute a hot-add region that can cover the pages | |
1010 | * that need to be hot-added while ensuring the alignment | |
1011 | * and size requirements of Linux as it relates to hot-add. | |
1012 | */ | |
1cac8cd4 S |
1013 | region_size = (pfn_cnt / HA_CHUNK) * HA_CHUNK; |
1014 | if (pfn_cnt % HA_CHUNK) | |
1015 | region_size += HA_CHUNK; | |
1016 | ||
1017 | region_start = (pg_start / HA_CHUNK) * HA_CHUNK; | |
1018 | ||
1019 | rg_start = region_start; | |
1020 | rg_sz = region_size; | |
1021 | } | |
1022 | ||
7f4f2302 S |
1023 | if (do_hot_add) |
1024 | resp.page_count = process_hot_add(pg_start, pfn_cnt, | |
1025 | rg_start, rg_sz); | |
549fd280 VK |
1026 | |
1027 | dm->num_pages_added += resp.page_count; | |
1cac8cd4 | 1028 | #endif |
7f4f2302 S |
1029 | /* |
1030 | * The result field of the response structure has the | |
1031 | * following semantics: | |
1032 | * | |
1033 | * 1. If all or some pages hot-added: Guest should return success. | |
1034 | * | |
1035 | * 2. If no pages could be hot-added: | |
1036 | * | |
1037 | * If the guest returns success, then the host | |
1038 | * will not attempt any further hot-add operations. This | |
1039 | * signifies a permanent failure. | |
1040 | * | |
1041 | * If the guest returns failure, then this failure will be | |
1042 | * treated as a transient failure and the host may retry the | |
1043 | * hot-add operation after some delay. | |
1044 | */ | |
1cac8cd4 S |
1045 | if (resp.page_count > 0) |
1046 | resp.result = 1; | |
7f4f2302 S |
1047 | else if (!do_hot_add) |
1048 | resp.result = 1; | |
1cac8cd4 S |
1049 | else |
1050 | resp.result = 0; | |
1051 | ||
25bd2b2f DC |
1052 | if (!do_hot_add || resp.page_count == 0) { |
1053 | if (!allow_hibernation) | |
1054 | pr_err("Memory hot add failed\n"); | |
1055 | else | |
1056 | pr_info("Ignore hot-add request!\n"); | |
1057 | } | |
1cac8cd4 S |
1058 | |
1059 | dm->state = DM_INITIALIZED; | |
20138d6c | 1060 | resp.hdr.trans_id = atomic_inc_return(&trans_id); |
1cac8cd4 | 1061 | vmbus_sendpacket(dm->dev->channel, &resp, |
9aa8b50b S |
1062 | sizeof(struct dm_hot_add_response), |
1063 | (unsigned long)NULL, | |
1064 | VM_PKT_DATA_INBAND, 0); | |
9aa8b50b S |
1065 | } |
1066 | ||
1067 | static void process_info(struct hv_dynmem_device *dm, struct dm_info_msg *msg) | |
1068 | { | |
6427a0d7 S |
1069 | struct dm_info_header *info_hdr; |
1070 | ||
1071 | info_hdr = (struct dm_info_header *)msg->info; | |
1072 | ||
1073 | switch (info_hdr->type) { | |
9aa8b50b | 1074 | case INFO_TYPE_MAX_PAGE_CNT: |
85000960 AN |
1075 | if (info_hdr->data_size == sizeof(__u64)) { |
1076 | __u64 *max_page_count = (__u64 *)&info_hdr[1]; | |
1077 | ||
7b6e54b5 | 1078 | pr_info("Max. dynamic memory size: %llu MB\n", |
2af5e7b7 | 1079 | (*max_page_count) >> (20 - HV_HYP_PAGE_SHIFT)); |
85000960 AN |
1080 | } |
1081 | ||
9aa8b50b S |
1082 | break; |
1083 | default: | |
223e1e4d | 1084 | pr_warn("Received Unknown type: %d\n", info_hdr->type); |
9aa8b50b S |
1085 | } |
1086 | } | |
1087 | ||
a6025a2a | 1088 | static unsigned long compute_balloon_floor(void) |
1c7db96f S |
1089 | { |
1090 | unsigned long min_pages; | |
ca79b0c2 | 1091 | unsigned long nr_pages = totalram_pages(); |
1c7db96f S |
1092 | #define MB2PAGES(mb) ((mb) << (20 - PAGE_SHIFT)) |
1093 | /* Simple continuous piecewiese linear function: | |
1094 | * max MiB -> min MiB gradient | |
1095 | * 0 0 | |
1096 | * 16 16 | |
1097 | * 32 24 | |
1098 | * 128 72 (1/2) | |
1099 | * 512 168 (1/4) | |
1100 | * 2048 360 (1/8) | |
7fb0e1a6 VK |
1101 | * 8192 744 (1/16) |
1102 | * 32768 1512 (1/32) | |
1c7db96f | 1103 | */ |
3d6357de AK |
1104 | if (nr_pages < MB2PAGES(128)) |
1105 | min_pages = MB2PAGES(8) + (nr_pages >> 1); | |
1106 | else if (nr_pages < MB2PAGES(512)) | |
1107 | min_pages = MB2PAGES(40) + (nr_pages >> 2); | |
1108 | else if (nr_pages < MB2PAGES(2048)) | |
1109 | min_pages = MB2PAGES(104) + (nr_pages >> 3); | |
1110 | else if (nr_pages < MB2PAGES(8192)) | |
1111 | min_pages = MB2PAGES(232) + (nr_pages >> 4); | |
1c7db96f | 1112 | else |
3d6357de | 1113 | min_pages = MB2PAGES(488) + (nr_pages >> 5); |
1c7db96f S |
1114 | #undef MB2PAGES |
1115 | return min_pages; | |
1116 | } | |
1117 | ||
9aa8b50b S |
1118 | /* |
1119 | * Post our status as it relates memory pressure to the | |
1120 | * host. Host expects the guests to post this status | |
1121 | * periodically at 1 second intervals. | |
1122 | * | |
1123 | * The metrics specified in this protocol are very Windows | |
1124 | * specific and so we cook up numbers here to convey our memory | |
1125 | * pressure. | |
1126 | */ | |
1127 | ||
1128 | static void post_status(struct hv_dynmem_device *dm) | |
1129 | { | |
1130 | struct dm_status status; | |
ae339336 S |
1131 | unsigned long now = jiffies; |
1132 | unsigned long last_post = last_post_time; | |
9aa8b50b | 1133 | |
e500d158 S |
1134 | if (pressure_report_delay > 0) { |
1135 | --pressure_report_delay; | |
1136 | return; | |
1137 | } | |
ae339336 S |
1138 | |
1139 | if (!time_after(now, (last_post_time + HZ))) | |
1140 | return; | |
1141 | ||
9aa8b50b S |
1142 | memset(&status, 0, sizeof(struct dm_status)); |
1143 | status.hdr.type = DM_STATUS_REPORT; | |
1144 | status.hdr.size = sizeof(struct dm_status); | |
1145 | status.hdr.trans_id = atomic_inc_return(&trans_id); | |
1146 | ||
0731572b | 1147 | /* |
549fd280 VK |
1148 | * The host expects the guest to report free and committed memory. |
1149 | * Furthermore, the host expects the pressure information to include | |
1150 | * the ballooned out pages. For a given amount of memory that we are | |
1151 | * managing we need to compute a floor below which we should not | |
1152 | * balloon. Compute this and add it to the pressure report. | |
1153 | * We also need to report all offline pages (num_pages_added - | |
1154 | * num_pages_onlined) as committed to the host, otherwise it can try | |
1155 | * asking us to balloon them out. | |
0731572b | 1156 | */ |
b605c2d9 | 1157 | status.num_avail = si_mem_available(); |
1c7db96f | 1158 | status.num_committed = vm_memory_committed() + |
549fd280 VK |
1159 | dm->num_pages_ballooned + |
1160 | (dm->num_pages_added > dm->num_pages_onlined ? | |
1161 | dm->num_pages_added - dm->num_pages_onlined : 0) + | |
1162 | compute_balloon_floor(); | |
9aa8b50b | 1163 | |
cf21be91 VK |
1164 | trace_balloon_status(status.num_avail, status.num_committed, |
1165 | vm_memory_committed(), dm->num_pages_ballooned, | |
1166 | dm->num_pages_added, dm->num_pages_onlined); | |
c5e2254f S |
1167 | /* |
1168 | * If our transaction ID is no longer current, just don't | |
1169 | * send the status. This can happen if we were interrupted | |
1170 | * after we picked our transaction ID. | |
1171 | */ | |
1172 | if (status.hdr.trans_id != atomic_read(&trans_id)) | |
1173 | return; | |
1174 | ||
ae339336 S |
1175 | /* |
1176 | * If the last post time that we sampled has changed, | |
1177 | * we have raced, don't post the status. | |
1178 | */ | |
1179 | if (last_post != last_post_time) | |
1180 | return; | |
1181 | ||
1182 | last_post_time = jiffies; | |
9aa8b50b S |
1183 | vmbus_sendpacket(dm->dev->channel, &status, |
1184 | sizeof(struct dm_status), | |
1185 | (unsigned long)NULL, | |
1186 | VM_PKT_DATA_INBAND, 0); | |
1187 | ||
1188 | } | |
1189 | ||
989623c7 | 1190 | static void free_balloon_pages(struct hv_dynmem_device *dm, |
9aa8b50b S |
1191 | union dm_mem_page_range *range_array) |
1192 | { | |
1193 | int num_pages = range_array->finfo.page_cnt; | |
1194 | __u64 start_frame = range_array->finfo.start_page; | |
1195 | struct page *pg; | |
1196 | int i; | |
1197 | ||
1198 | for (i = 0; i < num_pages; i++) { | |
1199 | pg = pfn_to_page(i + start_frame); | |
fae42c4d | 1200 | __ClearPageOffline(pg); |
9aa8b50b S |
1201 | __free_page(pg); |
1202 | dm->num_pages_ballooned--; | |
d1df458c | 1203 | adjust_managed_page_count(pg, 1); |
9aa8b50b S |
1204 | } |
1205 | } | |
1206 | ||
1207 | ||
1208 | ||
797f88c9 VK |
1209 | static unsigned int alloc_balloon_pages(struct hv_dynmem_device *dm, |
1210 | unsigned int num_pages, | |
1211 | struct dm_balloon_response *bl_resp, | |
1212 | int alloc_unit) | |
9aa8b50b | 1213 | { |
fae42c4d | 1214 | unsigned int i, j; |
9aa8b50b S |
1215 | struct page *pg; |
1216 | ||
d33c240d | 1217 | for (i = 0; i < num_pages / alloc_unit; i++) { |
9aa8b50b | 1218 | if (bl_resp->hdr.size + sizeof(union dm_mem_page_range) > |
2af5e7b7 | 1219 | HV_HYP_PAGE_SIZE) |
9aa8b50b S |
1220 | return i * alloc_unit; |
1221 | ||
1222 | /* | |
1223 | * We execute this code in a thread context. Furthermore, | |
1224 | * we don't want the kernel to try too hard. | |
1225 | */ | |
1226 | pg = alloc_pages(GFP_HIGHUSER | __GFP_NORETRY | | |
1227 | __GFP_NOMEMALLOC | __GFP_NOWARN, | |
1228 | get_order(alloc_unit << PAGE_SHIFT)); | |
1229 | ||
0a1a86ac | 1230 | if (!pg) |
9aa8b50b | 1231 | return i * alloc_unit; |
9aa8b50b S |
1232 | |
1233 | dm->num_pages_ballooned += alloc_unit; | |
1234 | ||
f766dc1e S |
1235 | /* |
1236 | * If we allocatted 2M pages; split them so we | |
1237 | * can free them in any order we get. | |
1238 | */ | |
1239 | ||
1240 | if (alloc_unit != 1) | |
1241 | split_page(pg, get_order(alloc_unit << PAGE_SHIFT)); | |
1242 | ||
fae42c4d | 1243 | /* mark all pages offline */ |
d1df458c | 1244 | for (j = 0; j < alloc_unit; j++) { |
fae42c4d | 1245 | __SetPageOffline(pg + j); |
d1df458c VK |
1246 | adjust_managed_page_count(pg + j, -1); |
1247 | } | |
fae42c4d | 1248 | |
9aa8b50b S |
1249 | bl_resp->range_count++; |
1250 | bl_resp->range_array[i].finfo.start_page = | |
1251 | page_to_pfn(pg); | |
1252 | bl_resp->range_array[i].finfo.page_cnt = alloc_unit; | |
1253 | bl_resp->hdr.size += sizeof(union dm_mem_page_range); | |
1254 | ||
1255 | } | |
1256 | ||
d33c240d | 1257 | return i * alloc_unit; |
9aa8b50b S |
1258 | } |
1259 | ||
6571b2da | 1260 | static void balloon_up(struct work_struct *dummy) |
9aa8b50b | 1261 | { |
797f88c9 VK |
1262 | unsigned int num_pages = dm_device.balloon_wrk.num_pages; |
1263 | unsigned int num_ballooned = 0; | |
9aa8b50b S |
1264 | struct dm_balloon_response *bl_resp; |
1265 | int alloc_unit; | |
1266 | int ret; | |
9aa8b50b S |
1267 | bool done = false; |
1268 | int i; | |
b605c2d9 | 1269 | long avail_pages; |
530d15b9 | 1270 | unsigned long floor; |
9aa8b50b | 1271 | |
9aa8b50b | 1272 | /* |
f766dc1e | 1273 | * We will attempt 2M allocations. However, if we fail to |
2af5e7b7 | 1274 | * allocate 2M chunks, we will go back to PAGE_SIZE allocations. |
9aa8b50b | 1275 | */ |
2af5e7b7 | 1276 | alloc_unit = PAGES_IN_2M; |
9aa8b50b | 1277 | |
b605c2d9 | 1278 | avail_pages = si_mem_available(); |
530d15b9 VK |
1279 | floor = compute_balloon_floor(); |
1280 | ||
d33c240d | 1281 | /* Refuse to balloon below the floor. */ |
b605c2d9 | 1282 | if (avail_pages < num_pages || avail_pages - num_pages < floor) { |
2c3bd2a5 | 1283 | pr_info("Balloon request will be partially fulfilled. %s\n", |
b3bb97b8 AN |
1284 | avail_pages < num_pages ? "Not enough memory." : |
1285 | "Balloon floor reached."); | |
1286 | ||
b605c2d9 | 1287 | num_pages = avail_pages > floor ? (avail_pages - floor) : 0; |
530d15b9 VK |
1288 | } |
1289 | ||
9aa8b50b | 1290 | while (!done) { |
2af5e7b7 | 1291 | memset(balloon_up_send_buffer, 0, HV_HYP_PAGE_SIZE); |
1fed17df | 1292 | bl_resp = (struct dm_balloon_response *)balloon_up_send_buffer; |
9aa8b50b | 1293 | bl_resp->hdr.type = DM_BALLOON_RESPONSE; |
9aa8b50b S |
1294 | bl_resp->hdr.size = sizeof(struct dm_balloon_response); |
1295 | bl_resp->more_pages = 1; | |
1296 | ||
9aa8b50b | 1297 | num_pages -= num_ballooned; |
6571b2da | 1298 | num_ballooned = alloc_balloon_pages(&dm_device, num_pages, |
0a1a86ac | 1299 | bl_resp, alloc_unit); |
9aa8b50b | 1300 | |
f6712238 | 1301 | if (alloc_unit != 1 && num_ballooned == 0) { |
f766dc1e S |
1302 | alloc_unit = 1; |
1303 | continue; | |
1304 | } | |
1305 | ||
0a1a86ac | 1306 | if (num_ballooned == 0 || num_ballooned == num_pages) { |
b3bb97b8 AN |
1307 | pr_debug("Ballooned %u out of %u requested pages.\n", |
1308 | num_pages, dm_device.balloon_wrk.num_pages); | |
1309 | ||
9aa8b50b S |
1310 | bl_resp->more_pages = 0; |
1311 | done = true; | |
6571b2da | 1312 | dm_device.state = DM_INITIALIZED; |
9aa8b50b S |
1313 | } |
1314 | ||
1315 | /* | |
1316 | * We are pushing a lot of data through the channel; | |
1317 | * deal with transient failures caused because of the | |
1318 | * lack of space in the ring buffer. | |
1319 | */ | |
1320 | ||
1321 | do { | |
20138d6c | 1322 | bl_resp->hdr.trans_id = atomic_inc_return(&trans_id); |
9aa8b50b S |
1323 | ret = vmbus_sendpacket(dm_device.dev->channel, |
1324 | bl_resp, | |
1325 | bl_resp->hdr.size, | |
1326 | (unsigned long)NULL, | |
1327 | VM_PKT_DATA_INBAND, 0); | |
1328 | ||
1329 | if (ret == -EAGAIN) | |
1330 | msleep(20); | |
ae339336 | 1331 | post_status(&dm_device); |
9aa8b50b S |
1332 | } while (ret == -EAGAIN); |
1333 | ||
1334 | if (ret) { | |
1335 | /* | |
1336 | * Free up the memory we allocatted. | |
1337 | */ | |
223e1e4d | 1338 | pr_err("Balloon response failed\n"); |
9aa8b50b S |
1339 | |
1340 | for (i = 0; i < bl_resp->range_count; i++) | |
6571b2da | 1341 | free_balloon_pages(&dm_device, |
9aa8b50b S |
1342 | &bl_resp->range_array[i]); |
1343 | ||
1344 | done = true; | |
1345 | } | |
1346 | } | |
1347 | ||
1348 | } | |
1349 | ||
1350 | static void balloon_down(struct hv_dynmem_device *dm, | |
1351 | struct dm_unballoon_request *req) | |
1352 | { | |
1353 | union dm_mem_page_range *range_array = req->range_array; | |
1354 | int range_count = req->range_count; | |
1355 | struct dm_unballoon_response resp; | |
1356 | int i; | |
b3bb97b8 | 1357 | unsigned int prev_pages_ballooned = dm->num_pages_ballooned; |
9aa8b50b | 1358 | |
ae339336 | 1359 | for (i = 0; i < range_count; i++) { |
9aa8b50b | 1360 | free_balloon_pages(dm, &range_array[i]); |
ab3de22b | 1361 | complete(&dm_device.config_event); |
ae339336 | 1362 | } |
9aa8b50b | 1363 | |
b3bb97b8 AN |
1364 | pr_debug("Freed %u ballooned pages.\n", |
1365 | prev_pages_ballooned - dm->num_pages_ballooned); | |
1366 | ||
9aa8b50b S |
1367 | if (req->more_pages == 1) |
1368 | return; | |
1369 | ||
1370 | memset(&resp, 0, sizeof(struct dm_unballoon_response)); | |
1371 | resp.hdr.type = DM_UNBALLOON_RESPONSE; | |
1372 | resp.hdr.trans_id = atomic_inc_return(&trans_id); | |
1373 | resp.hdr.size = sizeof(struct dm_unballoon_response); | |
1374 | ||
1375 | vmbus_sendpacket(dm_device.dev->channel, &resp, | |
1376 | sizeof(struct dm_unballoon_response), | |
1377 | (unsigned long)NULL, | |
1378 | VM_PKT_DATA_INBAND, 0); | |
1379 | ||
1380 | dm->state = DM_INITIALIZED; | |
1381 | } | |
1382 | ||
1383 | static void balloon_onchannelcallback(void *context); | |
1384 | ||
1385 | static int dm_thread_func(void *dm_dev) | |
1386 | { | |
1387 | struct hv_dynmem_device *dm = dm_dev; | |
9aa8b50b S |
1388 | |
1389 | while (!kthread_should_stop()) { | |
ab3de22b | 1390 | wait_for_completion_interruptible_timeout( |
5dba4c56 | 1391 | &dm_device.config_event, 1*HZ); |
9aa8b50b S |
1392 | /* |
1393 | * The host expects us to post information on the memory | |
1394 | * pressure every second. | |
1395 | */ | |
ab3de22b S |
1396 | reinit_completion(&dm_device.config_event); |
1397 | post_status(dm); | |
9aa8b50b S |
1398 | } |
1399 | ||
1400 | return 0; | |
1401 | } | |
1402 | ||
1403 | ||
1404 | static void version_resp(struct hv_dynmem_device *dm, | |
1405 | struct dm_version_response *vresp) | |
1406 | { | |
1407 | struct dm_version_request version_req; | |
1408 | int ret; | |
1409 | ||
1410 | if (vresp->is_accepted) { | |
1411 | /* | |
1412 | * We are done; wakeup the | |
1413 | * context waiting for version | |
1414 | * negotiation. | |
1415 | */ | |
1416 | complete(&dm->host_event); | |
1417 | return; | |
1418 | } | |
1419 | /* | |
1420 | * If there are more versions to try, continue | |
1421 | * with negotiations; if not | |
1422 | * shutdown the service since we are not able | |
1423 | * to negotiate a suitable version number | |
1424 | * with the host. | |
1425 | */ | |
1426 | if (dm->next_version == 0) | |
1427 | goto version_error; | |
1428 | ||
9aa8b50b S |
1429 | memset(&version_req, 0, sizeof(struct dm_version_request)); |
1430 | version_req.hdr.type = DM_VERSION_REQUEST; | |
1431 | version_req.hdr.size = sizeof(struct dm_version_request); | |
1432 | version_req.hdr.trans_id = atomic_inc_return(&trans_id); | |
b6ddeae1 | 1433 | version_req.version.version = dm->next_version; |
b3bb97b8 | 1434 | dm->version = version_req.version.version; |
b6ddeae1 AN |
1435 | |
1436 | /* | |
1437 | * Set the next version to try in case current version fails. | |
1438 | * Win7 protocol ought to be the last one to try. | |
1439 | */ | |
1440 | switch (version_req.version.version) { | |
1441 | case DYNMEM_PROTOCOL_VERSION_WIN8: | |
1442 | dm->next_version = DYNMEM_PROTOCOL_VERSION_WIN7; | |
1443 | version_req.is_last_attempt = 0; | |
1444 | break; | |
1445 | default: | |
1446 | dm->next_version = 0; | |
1447 | version_req.is_last_attempt = 1; | |
1448 | } | |
9aa8b50b S |
1449 | |
1450 | ret = vmbus_sendpacket(dm->dev->channel, &version_req, | |
1451 | sizeof(struct dm_version_request), | |
1452 | (unsigned long)NULL, | |
1453 | VM_PKT_DATA_INBAND, 0); | |
1454 | ||
1455 | if (ret) | |
1456 | goto version_error; | |
1457 | ||
1458 | return; | |
1459 | ||
1460 | version_error: | |
1461 | dm->state = DM_INIT_ERROR; | |
1462 | complete(&dm->host_event); | |
1463 | } | |
1464 | ||
1465 | static void cap_resp(struct hv_dynmem_device *dm, | |
1466 | struct dm_capabilities_resp_msg *cap_resp) | |
1467 | { | |
1468 | if (!cap_resp->is_accepted) { | |
223e1e4d | 1469 | pr_err("Capabilities not accepted by host\n"); |
9aa8b50b S |
1470 | dm->state = DM_INIT_ERROR; |
1471 | } | |
1472 | complete(&dm->host_event); | |
1473 | } | |
1474 | ||
1475 | static void balloon_onchannelcallback(void *context) | |
1476 | { | |
1477 | struct hv_device *dev = context; | |
1478 | u32 recvlen; | |
1479 | u64 requestid; | |
1480 | struct dm_message *dm_msg; | |
1481 | struct dm_header *dm_hdr; | |
1482 | struct hv_dynmem_device *dm = hv_get_drvdata(dev); | |
6571b2da | 1483 | struct dm_balloon *bal_msg; |
c51af826 S |
1484 | struct dm_hot_add *ha_msg; |
1485 | union dm_mem_page_range *ha_pg_range; | |
1cac8cd4 | 1486 | union dm_mem_page_range *ha_region; |
9aa8b50b S |
1487 | |
1488 | memset(recv_buffer, 0, sizeof(recv_buffer)); | |
1489 | vmbus_recvpacket(dev->channel, recv_buffer, | |
2af5e7b7 | 1490 | HV_HYP_PAGE_SIZE, &recvlen, &requestid); |
9aa8b50b S |
1491 | |
1492 | if (recvlen > 0) { | |
1493 | dm_msg = (struct dm_message *)recv_buffer; | |
1494 | dm_hdr = &dm_msg->hdr; | |
1495 | ||
1496 | switch (dm_hdr->type) { | |
1497 | case DM_VERSION_RESPONSE: | |
1498 | version_resp(dm, | |
1499 | (struct dm_version_response *)dm_msg); | |
1500 | break; | |
1501 | ||
1502 | case DM_CAPABILITIES_RESPONSE: | |
1503 | cap_resp(dm, | |
1504 | (struct dm_capabilities_resp_msg *)dm_msg); | |
1505 | break; | |
1506 | ||
1507 | case DM_BALLOON_REQUEST: | |
25bd2b2f DC |
1508 | if (allow_hibernation) { |
1509 | pr_info("Ignore balloon-up request!\n"); | |
1510 | break; | |
1511 | } | |
1512 | ||
6571b2da S |
1513 | if (dm->state == DM_BALLOON_UP) |
1514 | pr_warn("Currently ballooning\n"); | |
1515 | bal_msg = (struct dm_balloon *)recv_buffer; | |
9aa8b50b | 1516 | dm->state = DM_BALLOON_UP; |
6571b2da S |
1517 | dm_device.balloon_wrk.num_pages = bal_msg->num_pages; |
1518 | schedule_work(&dm_device.balloon_wrk.wrk); | |
9aa8b50b S |
1519 | break; |
1520 | ||
1521 | case DM_UNBALLOON_REQUEST: | |
25bd2b2f DC |
1522 | if (allow_hibernation) { |
1523 | pr_info("Ignore balloon-down request!\n"); | |
1524 | break; | |
1525 | } | |
1526 | ||
9aa8b50b S |
1527 | dm->state = DM_BALLOON_DOWN; |
1528 | balloon_down(dm, | |
1529 | (struct dm_unballoon_request *)recv_buffer); | |
1530 | break; | |
1531 | ||
1532 | case DM_MEM_HOT_ADD_REQUEST: | |
c51af826 S |
1533 | if (dm->state == DM_HOT_ADD) |
1534 | pr_warn("Currently hot-adding\n"); | |
9aa8b50b | 1535 | dm->state = DM_HOT_ADD; |
c51af826 | 1536 | ha_msg = (struct dm_hot_add *)recv_buffer; |
1cac8cd4 S |
1537 | if (ha_msg->hdr.size == sizeof(struct dm_hot_add)) { |
1538 | /* | |
1539 | * This is a normal hot-add request specifying | |
1540 | * hot-add memory. | |
1541 | */ | |
d19a55d6 | 1542 | dm->host_specified_ha_region = false; |
1cac8cd4 S |
1543 | ha_pg_range = &ha_msg->range; |
1544 | dm->ha_wrk.ha_page_range = *ha_pg_range; | |
1545 | dm->ha_wrk.ha_region_range.page_range = 0; | |
1546 | } else { | |
1547 | /* | |
1548 | * Host is specifying that we first hot-add | |
1549 | * a region and then partially populate this | |
1550 | * region. | |
1551 | */ | |
1552 | dm->host_specified_ha_region = true; | |
1553 | ha_pg_range = &ha_msg->range; | |
1554 | ha_region = &ha_pg_range[1]; | |
1555 | dm->ha_wrk.ha_page_range = *ha_pg_range; | |
1556 | dm->ha_wrk.ha_region_range = *ha_region; | |
1557 | } | |
c51af826 | 1558 | schedule_work(&dm_device.ha_wrk.wrk); |
9aa8b50b S |
1559 | break; |
1560 | ||
1561 | case DM_INFO_MESSAGE: | |
1562 | process_info(dm, (struct dm_info_msg *)dm_msg); | |
1563 | break; | |
1564 | ||
1565 | default: | |
1e280c9d | 1566 | pr_warn_ratelimited("Unhandled message: type: %d\n", dm_hdr->type); |
9aa8b50b S |
1567 | |
1568 | } | |
1569 | } | |
1570 | ||
1571 | } | |
1572 | ||
6dc2a774 SM |
1573 | /* Hyper-V only supports reporting 2MB pages or higher */ |
1574 | #define HV_MIN_PAGE_REPORTING_ORDER 9 | |
1575 | #define HV_MIN_PAGE_REPORTING_LEN (HV_HYP_PAGE_SIZE << HV_MIN_PAGE_REPORTING_ORDER) | |
1576 | static int hv_free_page_report(struct page_reporting_dev_info *pr_dev_info, | |
1577 | struct scatterlist *sgl, unsigned int nents) | |
1578 | { | |
1579 | unsigned long flags; | |
1580 | struct hv_memory_hint *hint; | |
1581 | int i; | |
1582 | u64 status; | |
1583 | struct scatterlist *sg; | |
1584 | ||
1585 | WARN_ON_ONCE(nents > HV_MEMORY_HINT_MAX_GPA_PAGE_RANGES); | |
1586 | WARN_ON_ONCE(sgl->length < HV_MIN_PAGE_REPORTING_LEN); | |
1587 | local_irq_save(flags); | |
1588 | hint = *(struct hv_memory_hint **)this_cpu_ptr(hyperv_pcpu_input_arg); | |
1589 | if (!hint) { | |
1590 | local_irq_restore(flags); | |
1591 | return -ENOSPC; | |
1592 | } | |
1593 | ||
1594 | hint->type = HV_EXT_MEMORY_HEAT_HINT_TYPE_COLD_DISCARD; | |
1595 | hint->reserved = 0; | |
1596 | for_each_sg(sgl, sg, nents, i) { | |
1597 | union hv_gpa_page_range *range; | |
1598 | ||
1599 | range = &hint->ranges[i]; | |
1600 | range->address_space = 0; | |
1601 | /* page reporting only reports 2MB pages or higher */ | |
1602 | range->page.largepage = 1; | |
1603 | range->page.additional_pages = | |
1604 | (sg->length / HV_MIN_PAGE_REPORTING_LEN) - 1; | |
1605 | range->page_size = HV_GPA_PAGE_RANGE_PAGE_SIZE_2MB; | |
1606 | range->base_large_pfn = | |
1607 | page_to_hvpfn(sg_page(sg)) >> HV_MIN_PAGE_REPORTING_ORDER; | |
1608 | } | |
1609 | ||
1610 | status = hv_do_rep_hypercall(HV_EXT_CALL_MEMORY_HEAT_HINT, nents, 0, | |
1611 | hint, NULL); | |
1612 | local_irq_restore(flags); | |
1613 | if ((status & HV_HYPERCALL_RESULT_MASK) != HV_STATUS_SUCCESS) { | |
1614 | pr_err("Cold memory discard hypercall failed with status %llx\n", | |
1615 | status); | |
1616 | return -EINVAL; | |
1617 | } | |
1618 | ||
1619 | return 0; | |
1620 | } | |
1621 | ||
1622 | static void enable_page_reporting(void) | |
1623 | { | |
1624 | int ret; | |
1625 | ||
1626 | /* Essentially, validating 'PAGE_REPORTING_MIN_ORDER' is big enough. */ | |
1627 | if (pageblock_order < HV_MIN_PAGE_REPORTING_ORDER) { | |
1628 | pr_debug("Cold memory discard is only supported on 2MB pages and above\n"); | |
1629 | return; | |
1630 | } | |
1631 | ||
1632 | if (!hv_query_ext_cap(HV_EXT_CAPABILITY_MEMORY_COLD_DISCARD_HINT)) { | |
1633 | pr_debug("Cold memory discard hint not supported by Hyper-V\n"); | |
1634 | return; | |
1635 | } | |
1636 | ||
1637 | BUILD_BUG_ON(PAGE_REPORTING_CAPACITY > HV_MEMORY_HINT_MAX_GPA_PAGE_RANGES); | |
1638 | dm_device.pr_dev_info.report = hv_free_page_report; | |
1639 | ret = page_reporting_register(&dm_device.pr_dev_info); | |
1640 | if (ret < 0) { | |
1641 | dm_device.pr_dev_info.report = NULL; | |
1642 | pr_err("Failed to enable cold memory discard: %d\n", ret); | |
1643 | } else { | |
1644 | pr_info("Cold memory discard hint enabled\n"); | |
1645 | } | |
1646 | } | |
1647 | ||
1648 | static void disable_page_reporting(void) | |
1649 | { | |
1650 | if (dm_device.pr_dev_info.report) { | |
1651 | page_reporting_unregister(&dm_device.pr_dev_info); | |
1652 | dm_device.pr_dev_info.report = NULL; | |
1653 | } | |
1654 | } | |
1655 | ||
e39aaa50 BF |
1656 | static int ballooning_enabled(void) |
1657 | { | |
1658 | /* | |
1659 | * Disable ballooning if the page size is not 4k (HV_HYP_PAGE_SIZE), | |
1660 | * since currently it's unclear to us whether an unballoon request can | |
1661 | * make sure all page ranges are guest page size aligned. | |
1662 | */ | |
1663 | if (PAGE_SIZE != HV_HYP_PAGE_SIZE) { | |
1664 | pr_info("Ballooning disabled because page size is not 4096 bytes\n"); | |
1665 | return 0; | |
1666 | } | |
1667 | ||
1668 | return 1; | |
1669 | } | |
1670 | ||
1671 | static int hot_add_enabled(void) | |
1672 | { | |
1673 | /* | |
1674 | * Disable hot add on ARM64, because we currently rely on | |
1675 | * memory_add_physaddr_to_nid() to get a node id of a hot add range, | |
1676 | * however ARM64's memory_add_physaddr_to_nid() always return 0 and | |
1677 | * DM_MEM_HOT_ADD_REQUEST doesn't have the NUMA node information for | |
1678 | * add_memory(). | |
1679 | */ | |
1680 | if (IS_ENABLED(CONFIG_ARM64)) { | |
1681 | pr_info("Memory hot add disabled on ARM64\n"); | |
1682 | return 0; | |
1683 | } | |
1684 | ||
1685 | return 1; | |
1686 | } | |
1687 | ||
221f6df0 | 1688 | static int balloon_connect_vsp(struct hv_device *dev) |
9aa8b50b | 1689 | { |
9aa8b50b S |
1690 | struct dm_version_request version_req; |
1691 | struct dm_capabilities cap_msg; | |
221f6df0 DC |
1692 | unsigned long t; |
1693 | int ret; | |
9aa8b50b | 1694 | |
c9566107 YL |
1695 | /* |
1696 | * max_pkt_size should be large enough for one vmbus packet header plus | |
1697 | * our receive buffer size. Hyper-V sends messages up to | |
1698 | * HV_HYP_PAGE_SIZE bytes long on balloon channel. | |
1699 | */ | |
1700 | dev->channel->max_pkt_size = HV_HYP_PAGE_SIZE * 2; | |
1701 | ||
9aa8b50b | 1702 | ret = vmbus_open(dev->channel, dm_ring_size, dm_ring_size, NULL, 0, |
221f6df0 | 1703 | balloon_onchannelcallback, dev); |
9aa8b50b | 1704 | if (ret) |
1fed17df | 1705 | return ret; |
9aa8b50b | 1706 | |
9aa8b50b S |
1707 | /* |
1708 | * Initiate the hand shake with the host and negotiate | |
1709 | * a version that the host can support. We start with the | |
1710 | * highest version number and go down if the host cannot | |
1711 | * support it. | |
1712 | */ | |
1713 | memset(&version_req, 0, sizeof(struct dm_version_request)); | |
1714 | version_req.hdr.type = DM_VERSION_REQUEST; | |
1715 | version_req.hdr.size = sizeof(struct dm_version_request); | |
1716 | version_req.hdr.trans_id = atomic_inc_return(&trans_id); | |
b6ddeae1 | 1717 | version_req.version.version = DYNMEM_PROTOCOL_VERSION_WIN10; |
9aa8b50b | 1718 | version_req.is_last_attempt = 0; |
b3bb97b8 | 1719 | dm_device.version = version_req.version.version; |
9aa8b50b S |
1720 | |
1721 | ret = vmbus_sendpacket(dev->channel, &version_req, | |
221f6df0 DC |
1722 | sizeof(struct dm_version_request), |
1723 | (unsigned long)NULL, VM_PKT_DATA_INBAND, 0); | |
9aa8b50b | 1724 | if (ret) |
221f6df0 | 1725 | goto out; |
9aa8b50b S |
1726 | |
1727 | t = wait_for_completion_timeout(&dm_device.host_event, 5*HZ); | |
1728 | if (t == 0) { | |
1729 | ret = -ETIMEDOUT; | |
221f6df0 | 1730 | goto out; |
9aa8b50b S |
1731 | } |
1732 | ||
1733 | /* | |
1734 | * If we could not negotiate a compatible version with the host | |
1735 | * fail the probe function. | |
1736 | */ | |
1737 | if (dm_device.state == DM_INIT_ERROR) { | |
221f6df0 DC |
1738 | ret = -EPROTO; |
1739 | goto out; | |
9aa8b50b | 1740 | } |
b3bb97b8 AN |
1741 | |
1742 | pr_info("Using Dynamic Memory protocol version %u.%u\n", | |
1743 | DYNMEM_MAJOR_VERSION(dm_device.version), | |
1744 | DYNMEM_MINOR_VERSION(dm_device.version)); | |
1745 | ||
9aa8b50b S |
1746 | /* |
1747 | * Now submit our capabilities to the host. | |
1748 | */ | |
1749 | memset(&cap_msg, 0, sizeof(struct dm_capabilities)); | |
1750 | cap_msg.hdr.type = DM_CAPABILITIES_REPORT; | |
1751 | cap_msg.hdr.size = sizeof(struct dm_capabilities); | |
1752 | cap_msg.hdr.trans_id = atomic_inc_return(&trans_id); | |
1753 | ||
25bd2b2f DC |
1754 | /* |
1755 | * When hibernation (i.e. virtual ACPI S4 state) is enabled, the host | |
1756 | * currently still requires the bits to be set, so we have to add code | |
1757 | * to fail the host's hot-add and balloon up/down requests, if any. | |
1758 | */ | |
e39aaa50 BF |
1759 | cap_msg.caps.cap_bits.balloon = ballooning_enabled(); |
1760 | cap_msg.caps.cap_bits.hot_add = hot_add_enabled(); | |
9aa8b50b | 1761 | |
647965a2 S |
1762 | /* |
1763 | * Specify our alignment requirements as it relates | |
1764 | * memory hot-add. Specify 128MB alignment. | |
1765 | */ | |
1766 | cap_msg.caps.cap_bits.hot_add_alignment = 7; | |
1767 | ||
9aa8b50b S |
1768 | /* |
1769 | * Currently the host does not use these | |
1770 | * values and we set them to what is done in the | |
1771 | * Windows driver. | |
1772 | */ | |
1773 | cap_msg.min_page_cnt = 0; | |
1774 | cap_msg.max_page_number = -1; | |
1775 | ||
1776 | ret = vmbus_sendpacket(dev->channel, &cap_msg, | |
221f6df0 DC |
1777 | sizeof(struct dm_capabilities), |
1778 | (unsigned long)NULL, VM_PKT_DATA_INBAND, 0); | |
9aa8b50b | 1779 | if (ret) |
221f6df0 | 1780 | goto out; |
9aa8b50b S |
1781 | |
1782 | t = wait_for_completion_timeout(&dm_device.host_event, 5*HZ); | |
1783 | if (t == 0) { | |
1784 | ret = -ETIMEDOUT; | |
221f6df0 | 1785 | goto out; |
9aa8b50b S |
1786 | } |
1787 | ||
1788 | /* | |
1789 | * If the host does not like our capabilities, | |
1790 | * fail the probe function. | |
1791 | */ | |
1792 | if (dm_device.state == DM_INIT_ERROR) { | |
221f6df0 DC |
1793 | ret = -EPROTO; |
1794 | goto out; | |
9aa8b50b S |
1795 | } |
1796 | ||
221f6df0 DC |
1797 | return 0; |
1798 | out: | |
1799 | vmbus_close(dev->channel); | |
1800 | return ret; | |
1801 | } | |
1802 | ||
1803 | static int balloon_probe(struct hv_device *dev, | |
1804 | const struct hv_vmbus_device_id *dev_id) | |
1805 | { | |
1806 | int ret; | |
1807 | ||
25bd2b2f DC |
1808 | allow_hibernation = hv_is_hibernation_supported(); |
1809 | if (allow_hibernation) | |
1810 | hot_add = false; | |
1811 | ||
221f6df0 DC |
1812 | #ifdef CONFIG_MEMORY_HOTPLUG |
1813 | do_hot_add = hot_add; | |
1814 | #else | |
1815 | do_hot_add = false; | |
1816 | #endif | |
1817 | dm_device.dev = dev; | |
1818 | dm_device.state = DM_INITIALIZING; | |
1819 | dm_device.next_version = DYNMEM_PROTOCOL_VERSION_WIN8; | |
1820 | init_completion(&dm_device.host_event); | |
1821 | init_completion(&dm_device.config_event); | |
1822 | INIT_LIST_HEAD(&dm_device.ha_region_list); | |
1823 | spin_lock_init(&dm_device.ha_lock); | |
1824 | INIT_WORK(&dm_device.balloon_wrk.wrk, balloon_up); | |
1825 | INIT_WORK(&dm_device.ha_wrk.wrk, hot_add_req); | |
1826 | dm_device.host_specified_ha_region = false; | |
1827 | ||
1828 | #ifdef CONFIG_MEMORY_HOTPLUG | |
1829 | set_online_page_callback(&hv_online_page); | |
bc58ebd5 | 1830 | init_completion(&dm_device.ol_waitevent); |
221f6df0 DC |
1831 | register_memory_notifier(&hv_memory_nb); |
1832 | #endif | |
1833 | ||
1834 | hv_set_drvdata(dev, &dm_device); | |
1835 | ||
1836 | ret = balloon_connect_vsp(dev); | |
1837 | if (ret != 0) | |
1838 | return ret; | |
1839 | ||
6dc2a774 | 1840 | enable_page_reporting(); |
9aa8b50b | 1841 | dm_device.state = DM_INITIALIZED; |
221f6df0 DC |
1842 | |
1843 | dm_device.thread = | |
1844 | kthread_run(dm_thread_func, &dm_device, "hv_balloon"); | |
1845 | if (IS_ERR(dm_device.thread)) { | |
1846 | ret = PTR_ERR(dm_device.thread); | |
1847 | goto probe_error; | |
1848 | } | |
9aa8b50b S |
1849 | |
1850 | return 0; | |
1851 | ||
221f6df0 | 1852 | probe_error: |
25bd2b2f DC |
1853 | dm_device.state = DM_INIT_ERROR; |
1854 | dm_device.thread = NULL; | |
6dc2a774 | 1855 | disable_page_reporting(); |
221f6df0 | 1856 | vmbus_close(dev->channel); |
1cac8cd4 | 1857 | #ifdef CONFIG_MEMORY_HOTPLUG |
221f6df0 | 1858 | unregister_memory_notifier(&hv_memory_nb); |
1cac8cd4 S |
1859 | restore_online_page_callback(&hv_online_page); |
1860 | #endif | |
9aa8b50b S |
1861 | return ret; |
1862 | } | |
1863 | ||
1864 | static int balloon_remove(struct hv_device *dev) | |
1865 | { | |
1866 | struct hv_dynmem_device *dm = hv_get_drvdata(dev); | |
eece30b9 | 1867 | struct hv_hotadd_state *has, *tmp; |
cb7a5724 | 1868 | struct hv_hotadd_gap *gap, *tmp_gap; |
eece30b9 | 1869 | unsigned long flags; |
9aa8b50b S |
1870 | |
1871 | if (dm->num_pages_ballooned != 0) | |
1872 | pr_warn("Ballooned pages: %d\n", dm->num_pages_ballooned); | |
1873 | ||
6571b2da | 1874 | cancel_work_sync(&dm->balloon_wrk.wrk); |
c51af826 | 1875 | cancel_work_sync(&dm->ha_wrk.wrk); |
1cac8cd4 | 1876 | |
9aa8b50b | 1877 | kthread_stop(dm->thread); |
6dc2a774 | 1878 | disable_page_reporting(); |
221f6df0 | 1879 | vmbus_close(dev->channel); |
1cac8cd4 | 1880 | #ifdef CONFIG_MEMORY_HOTPLUG |
22f88475 | 1881 | unregister_memory_notifier(&hv_memory_nb); |
221f6df0 | 1882 | restore_online_page_callback(&hv_online_page); |
1cac8cd4 | 1883 | #endif |
eece30b9 VK |
1884 | spin_lock_irqsave(&dm_device.ha_lock, flags); |
1885 | list_for_each_entry_safe(has, tmp, &dm->ha_region_list, list) { | |
cb7a5724 VK |
1886 | list_for_each_entry_safe(gap, tmp_gap, &has->gap_list, list) { |
1887 | list_del(&gap->list); | |
1888 | kfree(gap); | |
1889 | } | |
1cac8cd4 S |
1890 | list_del(&has->list); |
1891 | kfree(has); | |
1892 | } | |
eece30b9 | 1893 | spin_unlock_irqrestore(&dm_device.ha_lock, flags); |
9aa8b50b S |
1894 | |
1895 | return 0; | |
1896 | } | |
1897 | ||
25bd2b2f DC |
1898 | static int balloon_suspend(struct hv_device *hv_dev) |
1899 | { | |
1900 | struct hv_dynmem_device *dm = hv_get_drvdata(hv_dev); | |
1901 | ||
1902 | tasklet_disable(&hv_dev->channel->callback_event); | |
1903 | ||
1904 | cancel_work_sync(&dm->balloon_wrk.wrk); | |
1905 | cancel_work_sync(&dm->ha_wrk.wrk); | |
1906 | ||
1907 | if (dm->thread) { | |
1908 | kthread_stop(dm->thread); | |
1909 | dm->thread = NULL; | |
1910 | vmbus_close(hv_dev->channel); | |
1911 | } | |
1912 | ||
1913 | tasklet_enable(&hv_dev->channel->callback_event); | |
1914 | ||
1915 | return 0; | |
1916 | ||
1917 | } | |
1918 | ||
1919 | static int balloon_resume(struct hv_device *dev) | |
1920 | { | |
1921 | int ret; | |
1922 | ||
1923 | dm_device.state = DM_INITIALIZING; | |
1924 | ||
1925 | ret = balloon_connect_vsp(dev); | |
1926 | ||
1927 | if (ret != 0) | |
1928 | goto out; | |
1929 | ||
1930 | dm_device.thread = | |
1931 | kthread_run(dm_thread_func, &dm_device, "hv_balloon"); | |
1932 | if (IS_ERR(dm_device.thread)) { | |
1933 | ret = PTR_ERR(dm_device.thread); | |
1934 | dm_device.thread = NULL; | |
1935 | goto close_channel; | |
1936 | } | |
1937 | ||
1938 | dm_device.state = DM_INITIALIZED; | |
1939 | return 0; | |
1940 | close_channel: | |
1941 | vmbus_close(dev->channel); | |
1942 | out: | |
1943 | dm_device.state = DM_INIT_ERROR; | |
1944 | #ifdef CONFIG_MEMORY_HOTPLUG | |
1945 | unregister_memory_notifier(&hv_memory_nb); | |
1946 | restore_online_page_callback(&hv_online_page); | |
1947 | #endif | |
1948 | return ret; | |
1949 | } | |
1950 | ||
9aa8b50b S |
1951 | static const struct hv_vmbus_device_id id_table[] = { |
1952 | /* Dynamic Memory Class ID */ | |
1953 | /* 525074DC-8985-46e2-8057-A307DC18A502 */ | |
d13984e5 | 1954 | { HV_DM_GUID, }, |
9aa8b50b S |
1955 | { }, |
1956 | }; | |
1957 | ||
1958 | MODULE_DEVICE_TABLE(vmbus, id_table); | |
1959 | ||
1960 | static struct hv_driver balloon_drv = { | |
1961 | .name = "hv_balloon", | |
1962 | .id_table = id_table, | |
1963 | .probe = balloon_probe, | |
1964 | .remove = balloon_remove, | |
25bd2b2f DC |
1965 | .suspend = balloon_suspend, |
1966 | .resume = balloon_resume, | |
af0a5646 AV |
1967 | .driver = { |
1968 | .probe_type = PROBE_PREFER_ASYNCHRONOUS, | |
1969 | }, | |
9aa8b50b S |
1970 | }; |
1971 | ||
1972 | static int __init init_balloon_drv(void) | |
1973 | { | |
1974 | ||
1975 | return vmbus_driver_register(&balloon_drv); | |
1976 | } | |
1977 | ||
9aa8b50b | 1978 | module_init(init_balloon_drv); |
9aa8b50b S |
1979 | |
1980 | MODULE_DESCRIPTION("Hyper-V Balloon"); | |
9aa8b50b | 1981 | MODULE_LICENSE("GPL"); |