1 | /* SPDX-License-Identifier: GPL-2.0-only */ |
2 | /* |
3 | * |
4 | * Copyright (c) 2011, Microsoft Corporation. |
5 | * |
6 | * Authors: |
7 | * Haiyang Zhang <haiyangz@microsoft.com> |
8 | * Hank Janssen <hjanssen@microsoft.com> |
9 | * K. Y. Srinivasan <kys@microsoft.com> |
10 | */ |
11 | |
12 | #ifndef _HYPERV_H |
13 | #define _HYPERV_H |
14 | |
15 | #include <uapi/linux/hyperv.h> |
16 | |
17 | #include <linux/mm.h> |
18 | #include <linux/types.h> |
19 | #include <linux/scatterlist.h> |
20 | #include <linux/list.h> |
21 | #include <linux/timer.h> |
22 | #include <linux/completion.h> |
23 | #include <linux/device.h> |
24 | #include <linux/mod_devicetable.h> |
25 | #include <linux/interrupt.h> |
26 | #include <linux/reciprocal_div.h> |
27 | #include <asm/hyperv-tlfs.h> |
28 | |
29 | #define MAX_PAGE_BUFFER_COUNT 32 |
30 | #define MAX_MULTIPAGE_BUFFER_COUNT 32 /* 128K */ |
31 | |
32 | #pragma pack(push, 1) |
33 | |
34 | /* |
35 | * Types for GPADL, decides is how GPADL header is created. |
36 | * |
37 | * It doesn't make much difference between BUFFER and RING if PAGE_SIZE is the |
38 | * same as HV_HYP_PAGE_SIZE. |
39 | * |
40 | * If PAGE_SIZE is bigger than HV_HYP_PAGE_SIZE, the headers of ring buffers |
41 | * will be of PAGE_SIZE, however, only the first HV_HYP_PAGE will be put |
42 | * into gpadl, therefore the number for HV_HYP_PAGE and the indexes of each |
43 | * HV_HYP_PAGE will be different between different types of GPADL, for example |
44 | * if PAGE_SIZE is 64K: |
45 | * |
46 | * BUFFER: |
47 | * |
48 | * gva: |-- 64k --|-- 64k --| ... | |
49 | * gpa: | 4k | 4k | ... | 4k | 4k | 4k | ... | 4k | |
50 | * index: 0 1 2 15 16 17 18 .. 31 32 ... |
51 | * | | ... | | | ... | ... |
52 | * v V V V V V |
53 | * gpadl: | 4k | 4k | ... | 4k | 4k | 4k | ... | 4k | ... | |
54 | * index: 0 1 2 ... 15 16 17 18 .. 31 32 ... |
55 | * |
56 | * RING: |
57 | * |
58 | * | header | data | header | data | |
59 | * gva: |-- 64k --|-- 64k --| ... |-- 64k --|-- 64k --| ... | |
60 | * gpa: | 4k | .. | 4k | 4k | ... | 4k | ... | 4k | .. | 4k | .. | ... | |
61 | * index: 0 1 16 17 18 31 ... n n+1 n+16 ... 2n |
62 | * | / / / | / / |
63 | * | / / / | / / |
64 | * | / / ... / ... | / ... / |
65 | * | / / / | / / |
66 | * | / / / | / / |
67 | * V V V V V V v |
68 | * gpadl: | 4k | 4k | ... | ... | 4k | 4k | ... | |
69 | * index: 0 1 2 ... 16 ... n-15 n-14 n-13 ... 2n-30 |
70 | */ |
71 | enum hv_gpadl_type { |
72 | HV_GPADL_BUFFER, |
73 | HV_GPADL_RING |
74 | }; |
75 | |
76 | /* Single-page buffer */ |
77 | struct hv_page_buffer { |
78 | u32 len; |
79 | u32 offset; |
80 | u64 pfn; |
81 | }; |
82 | |
83 | /* Multiple-page buffer */ |
84 | struct hv_multipage_buffer { |
85 | /* Length and Offset determines the # of pfns in the array */ |
86 | u32 len; |
87 | u32 offset; |
88 | u64 pfn_array[MAX_MULTIPAGE_BUFFER_COUNT]; |
89 | }; |
90 | |
91 | /* |
92 | * Multiple-page buffer array; the pfn array is variable size: |
93 | * The number of entries in the PFN array is determined by |
94 | * "len" and "offset". |
95 | */ |
96 | struct hv_mpb_array { |
97 | /* Length and Offset determines the # of pfns in the array */ |
98 | u32 len; |
99 | u32 offset; |
100 | u64 pfn_array[]; |
101 | }; |
102 | |
103 | /* 0x18 includes the proprietary packet header */ |
104 | #define MAX_PAGE_BUFFER_PACKET (0x18 + \ |
105 | (sizeof(struct hv_page_buffer) * \ |
106 | MAX_PAGE_BUFFER_COUNT)) |
107 | #define MAX_MULTIPAGE_BUFFER_PACKET (0x18 + \ |
108 | sizeof(struct hv_multipage_buffer)) |
109 | |
110 | |
111 | #pragma pack(pop) |
112 | |
113 | struct hv_ring_buffer { |
114 | /* Offset in bytes from the start of ring data below */ |
115 | u32 write_index; |
116 | |
117 | /* Offset in bytes from the start of ring data below */ |
118 | u32 read_index; |
119 | |
120 | u32 interrupt_mask; |
121 | |
122 | /* |
123 | * WS2012/Win8 and later versions of Hyper-V implement interrupt |
124 | * driven flow management. The feature bit feat_pending_send_sz |
125 | * is set by the host on the host->guest ring buffer, and by the |
126 | * guest on the guest->host ring buffer. |
127 | * |
128 | * The meaning of the feature bit is a bit complex in that it has |
129 | * semantics that apply to both ring buffers. If the guest sets |
130 | * the feature bit in the guest->host ring buffer, the guest is |
131 | * telling the host that: |
132 | * 1) It will set the pending_send_sz field in the guest->host ring |
133 | * buffer when it is waiting for space to become available, and |
134 | * 2) It will read the pending_send_sz field in the host->guest |
135 | * ring buffer and interrupt the host when it frees enough space |
136 | * |
137 | * Similarly, if the host sets the feature bit in the host->guest |
138 | * ring buffer, the host is telling the guest that: |
139 | * 1) It will set the pending_send_sz field in the host->guest ring |
140 | * buffer when it is waiting for space to become available, and |
141 | * 2) It will read the pending_send_sz field in the guest->host |
142 | * ring buffer and interrupt the guest when it frees enough space |
143 | * |
144 | * If either the guest or host does not set the feature bit that it |
145 | * owns, that guest or host must do polling if it encounters a full |
146 | * ring buffer, and not signal the other end with an interrupt. |
147 | */ |
148 | u32 pending_send_sz; |
149 | u32 reserved1[12]; |
150 | union { |
151 | struct { |
152 | u32 feat_pending_send_sz:1; |
153 | }; |
154 | u32 value; |
155 | } feature_bits; |
156 | |
157 | /* Pad it to PAGE_SIZE so that data starts on page boundary */ |
158 | u8 reserved2[PAGE_SIZE - 68]; |
159 | |
160 | /* |
161 | * Ring data starts here + RingDataStartOffset |
162 | * !!! DO NOT place any fields below this !!! |
163 | */ |
164 | u8 buffer[]; |
165 | } __packed; |
166 | |
167 | /* Calculate the proper size of a ringbuffer, it must be page-aligned */ |
168 | #define VMBUS_RING_SIZE(payload_sz) PAGE_ALIGN(sizeof(struct hv_ring_buffer) + \ |
169 | (payload_sz)) |
170 | |
171 | struct hv_ring_buffer_info { |
172 | struct hv_ring_buffer *ring_buffer; |
173 | u32 ring_size; /* Include the shared header */ |
174 | struct reciprocal_value ring_size_div10_reciprocal; |
175 | spinlock_t ring_lock; |
176 | |
177 | u32 ring_datasize; /* < ring_size */ |
178 | u32 priv_read_index; |
179 | /* |
180 | * The ring buffer mutex lock. This lock prevents the ring buffer from |
181 | * being freed while the ring buffer is being accessed. |
182 | */ |
183 | struct mutex ring_buffer_mutex; |
184 | |
185 | /* Buffer that holds a copy of an incoming host packet */ |
186 | void *pkt_buffer; |
187 | u32 pkt_buffer_size; |
188 | }; |
189 | |
190 | |
191 | static inline u32 hv_get_bytes_to_read(const struct hv_ring_buffer_info *rbi) |
192 | { |
193 | u32 read_loc, write_loc, dsize, read; |
194 | |
195 | dsize = rbi->ring_datasize; |
196 | read_loc = rbi->ring_buffer->read_index; |
197 | write_loc = READ_ONCE(rbi->ring_buffer->write_index); |
198 | |
199 | read = write_loc >= read_loc ? (write_loc - read_loc) : |
200 | (dsize - read_loc) + write_loc; |
201 | |
202 | return read; |
203 | } |
204 | |
205 | static inline u32 hv_get_bytes_to_write(const struct hv_ring_buffer_info *rbi) |
206 | { |
207 | u32 read_loc, write_loc, dsize, write; |
208 | |
209 | dsize = rbi->ring_datasize; |
210 | read_loc = READ_ONCE(rbi->ring_buffer->read_index); |
211 | write_loc = rbi->ring_buffer->write_index; |
212 | |
213 | write = write_loc >= read_loc ? dsize - (write_loc - read_loc) : |
214 | read_loc - write_loc; |
215 | return write; |
216 | } |
217 | |
218 | static inline u32 hv_get_avail_to_write_percent( |
219 | const struct hv_ring_buffer_info *rbi) |
220 | { |
221 | u32 avail_write = hv_get_bytes_to_write(rbi); |
222 | |
223 | return reciprocal_divide( |
224 | a: (avail_write << 3) + (avail_write << 1), |
225 | R: rbi->ring_size_div10_reciprocal); |
226 | } |
227 | |
228 | /* |
229 | * VMBUS version is 32 bit entity broken up into |
230 | * two 16 bit quantities: major_number. minor_number. |
231 | * |
232 | * 0 . 13 (Windows Server 2008) |
233 | * 1 . 1 (Windows 7, WS2008 R2) |
234 | * 2 . 4 (Windows 8, WS2012) |
235 | * 3 . 0 (Windows 8.1, WS2012 R2) |
236 | * 4 . 0 (Windows 10) |
237 | * 4 . 1 (Windows 10 RS3) |
238 | * 5 . 0 (Newer Windows 10) |
239 | * 5 . 1 (Windows 10 RS4) |
240 | * 5 . 2 (Windows Server 2019, RS5) |
241 | * 5 . 3 (Windows Server 2022) |
242 | * |
243 | * The WS2008 and WIN7 versions are listed here for |
244 | * completeness but are no longer supported in the |
245 | * Linux kernel. |
246 | */ |
247 | |
248 | #define VERSION_WS2008 ((0 << 16) | (13)) |
249 | #define VERSION_WIN7 ((1 << 16) | (1)) |
250 | #define VERSION_WIN8 ((2 << 16) | (4)) |
251 | #define VERSION_WIN8_1 ((3 << 16) | (0)) |
252 | #define VERSION_WIN10 ((4 << 16) | (0)) |
253 | #define VERSION_WIN10_V4_1 ((4 << 16) | (1)) |
254 | #define VERSION_WIN10_V5 ((5 << 16) | (0)) |
255 | #define VERSION_WIN10_V5_1 ((5 << 16) | (1)) |
256 | #define VERSION_WIN10_V5_2 ((5 << 16) | (2)) |
257 | #define VERSION_WIN10_V5_3 ((5 << 16) | (3)) |
258 | |
259 | /* Make maximum size of pipe payload of 16K */ |
260 | #define MAX_PIPE_DATA_PAYLOAD (sizeof(u8) * 16384) |
261 | |
262 | /* Define PipeMode values. */ |
263 | #define VMBUS_PIPE_TYPE_BYTE 0x00000000 |
264 | #define VMBUS_PIPE_TYPE_MESSAGE 0x00000004 |
265 | |
266 | /* The size of the user defined data buffer for non-pipe offers. */ |
267 | #define MAX_USER_DEFINED_BYTES 120 |
268 | |
269 | /* The size of the user defined data buffer for pipe offers. */ |
270 | #define MAX_PIPE_USER_DEFINED_BYTES 116 |
271 | |
272 | /* |
273 | * At the center of the Channel Management library is the Channel Offer. This |
274 | * struct contains the fundamental information about an offer. |
275 | */ |
276 | struct vmbus_channel_offer { |
277 | guid_t if_type; |
278 | guid_t if_instance; |
279 | |
280 | /* |
281 | * These two fields are not currently used. |
282 | */ |
283 | u64 reserved1; |
284 | u64 reserved2; |
285 | |
286 | u16 chn_flags; |
287 | u16 mmio_megabytes; /* in bytes * 1024 * 1024 */ |
288 | |
289 | union { |
290 | /* Non-pipes: The user has MAX_USER_DEFINED_BYTES bytes. */ |
291 | struct { |
292 | unsigned char user_def[MAX_USER_DEFINED_BYTES]; |
293 | } std; |
294 | |
295 | /* |
296 | * Pipes: |
297 | * The following structure is an integrated pipe protocol, which |
298 | * is implemented on top of standard user-defined data. Pipe |
299 | * clients have MAX_PIPE_USER_DEFINED_BYTES left for their own |
300 | * use. |
301 | */ |
302 | struct { |
303 | u32 pipe_mode; |
304 | unsigned char user_def[MAX_PIPE_USER_DEFINED_BYTES]; |
305 | } pipe; |
306 | } u; |
307 | /* |
308 | * The sub_channel_index is defined in Win8: a value of zero means a |
309 | * primary channel and a value of non-zero means a sub-channel. |
310 | * |
311 | * Before Win8, the field is reserved, meaning it's always zero. |
312 | */ |
313 | u16 sub_channel_index; |
314 | u16 reserved3; |
315 | } __packed; |
316 | |
317 | /* Server Flags */ |
318 | #define VMBUS_CHANNEL_ENUMERATE_DEVICE_INTERFACE 1 |
319 | #define VMBUS_CHANNEL_SERVER_SUPPORTS_TRANSFER_PAGES 2 |
320 | #define VMBUS_CHANNEL_SERVER_SUPPORTS_GPADLS 4 |
321 | #define VMBUS_CHANNEL_NAMED_PIPE_MODE 0x10 |
322 | #define VMBUS_CHANNEL_LOOPBACK_OFFER 0x100 |
323 | #define VMBUS_CHANNEL_PARENT_OFFER 0x200 |
324 | #define VMBUS_CHANNEL_REQUEST_MONITORED_NOTIFICATION 0x400 |
325 | #define VMBUS_CHANNEL_TLNPI_PROVIDER_OFFER 0x2000 |
326 | |
327 | struct vmpacket_descriptor { |
328 | u16 type; |
329 | u16 offset8; |
330 | u16 len8; |
331 | u16 flags; |
332 | u64 trans_id; |
333 | } __packed; |
334 | |
335 | struct { |
336 | u32 ; |
337 | struct vmpacket_descriptor ; |
338 | } __packed; |
339 | |
340 | struct vmtransfer_page_range { |
341 | u32 byte_count; |
342 | u32 byte_offset; |
343 | } __packed; |
344 | |
345 | struct { |
346 | struct vmpacket_descriptor ; |
347 | u16 ; |
348 | u8 ; |
349 | u8 ; |
350 | u32 ; |
351 | struct vmtransfer_page_range []; |
352 | } __packed; |
353 | |
354 | struct { |
355 | struct vmpacket_descriptor ; |
356 | u32 ; |
357 | u32 ; |
358 | } __packed; |
359 | |
360 | struct vmadd_remove_transfer_page_set { |
361 | struct vmpacket_descriptor d; |
362 | u32 gpadl; |
363 | u16 xfer_pageset_id; |
364 | u16 reserved; |
365 | } __packed; |
366 | |
367 | /* |
368 | * This structure defines a range in guest physical space that can be made to |
369 | * look virtually contiguous. |
370 | */ |
371 | struct gpa_range { |
372 | u32 byte_count; |
373 | u32 byte_offset; |
374 | u64 pfn_array[]; |
375 | }; |
376 | |
377 | /* |
378 | * This is the format for an Establish Gpadl packet, which contains a handle by |
379 | * which this GPADL will be known and a set of GPA ranges associated with it. |
380 | * This can be converted to a MDL by the guest OS. If there are multiple GPA |
381 | * ranges, then the resulting MDL will be "chained," representing multiple VA |
382 | * ranges. |
383 | */ |
384 | struct vmestablish_gpadl { |
385 | struct vmpacket_descriptor d; |
386 | u32 gpadl; |
387 | u32 range_cnt; |
388 | struct gpa_range range[1]; |
389 | } __packed; |
390 | |
391 | /* |
392 | * This is the format for a Teardown Gpadl packet, which indicates that the |
393 | * GPADL handle in the Establish Gpadl packet will never be referenced again. |
394 | */ |
395 | struct vmteardown_gpadl { |
396 | struct vmpacket_descriptor d; |
397 | u32 gpadl; |
398 | u32 reserved; /* for alignment to a 8-byte boundary */ |
399 | } __packed; |
400 | |
401 | /* |
402 | * This is the format for a GPA-Direct packet, which contains a set of GPA |
403 | * ranges, in addition to commands and/or data. |
404 | */ |
405 | struct vmdata_gpa_direct { |
406 | struct vmpacket_descriptor d; |
407 | u32 reserved; |
408 | u32 range_cnt; |
409 | struct gpa_range range[1]; |
410 | } __packed; |
411 | |
412 | /* This is the format for a Additional Data Packet. */ |
413 | struct vmadditional_data { |
414 | struct vmpacket_descriptor d; |
415 | u64 total_bytes; |
416 | u32 offset; |
417 | u32 byte_cnt; |
418 | unsigned char data[1]; |
419 | } __packed; |
420 | |
421 | union { |
422 | struct vmpacket_descriptor ; |
423 | struct vmtransfer_page_packet_header ; |
424 | struct vmgpadl_packet_header ; |
425 | struct vmadd_remove_transfer_page_set ; |
426 | struct vmestablish_gpadl ; |
427 | struct vmteardown_gpadl ; |
428 | struct vmdata_gpa_direct ; |
429 | }; |
430 | |
431 | #define VMPACKET_DATA_START_ADDRESS(__packet) \ |
432 | (void *)(((unsigned char *)__packet) + \ |
433 | ((struct vmpacket_descriptor)__packet)->offset8 * 8) |
434 | |
435 | #define VMPACKET_DATA_LENGTH(__packet) \ |
436 | ((((struct vmpacket_descriptor)__packet)->len8 - \ |
437 | ((struct vmpacket_descriptor)__packet)->offset8) * 8) |
438 | |
439 | #define VMPACKET_TRANSFER_MODE(__packet) \ |
440 | (((struct IMPACT)__packet)->type) |
441 | |
442 | enum vmbus_packet_type { |
443 | VM_PKT_INVALID = 0x0, |
444 | VM_PKT_SYNCH = 0x1, |
445 | VM_PKT_ADD_XFER_PAGESET = 0x2, |
446 | VM_PKT_RM_XFER_PAGESET = 0x3, |
447 | VM_PKT_ESTABLISH_GPADL = 0x4, |
448 | VM_PKT_TEARDOWN_GPADL = 0x5, |
449 | VM_PKT_DATA_INBAND = 0x6, |
450 | VM_PKT_DATA_USING_XFER_PAGES = 0x7, |
451 | VM_PKT_DATA_USING_GPADL = 0x8, |
452 | VM_PKT_DATA_USING_GPA_DIRECT = 0x9, |
453 | VM_PKT_CANCEL_REQUEST = 0xa, |
454 | VM_PKT_COMP = 0xb, |
455 | VM_PKT_DATA_USING_ADDITIONAL_PKT = 0xc, |
456 | VM_PKT_ADDITIONAL_DATA = 0xd |
457 | }; |
458 | |
459 | #define VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED 1 |
460 | |
461 | |
462 | /* Version 1 messages */ |
463 | enum vmbus_channel_message_type { |
464 | CHANNELMSG_INVALID = 0, |
465 | CHANNELMSG_OFFERCHANNEL = 1, |
466 | CHANNELMSG_RESCIND_CHANNELOFFER = 2, |
467 | CHANNELMSG_REQUESTOFFERS = 3, |
468 | CHANNELMSG_ALLOFFERS_DELIVERED = 4, |
469 | CHANNELMSG_OPENCHANNEL = 5, |
470 | CHANNELMSG_OPENCHANNEL_RESULT = 6, |
471 | CHANNELMSG_CLOSECHANNEL = 7, |
472 | = 8, |
473 | CHANNELMSG_GPADL_BODY = 9, |
474 | CHANNELMSG_GPADL_CREATED = 10, |
475 | CHANNELMSG_GPADL_TEARDOWN = 11, |
476 | CHANNELMSG_GPADL_TORNDOWN = 12, |
477 | CHANNELMSG_RELID_RELEASED = 13, |
478 | CHANNELMSG_INITIATE_CONTACT = 14, |
479 | CHANNELMSG_VERSION_RESPONSE = 15, |
480 | CHANNELMSG_UNLOAD = 16, |
481 | CHANNELMSG_UNLOAD_RESPONSE = 17, |
482 | CHANNELMSG_18 = 18, |
483 | CHANNELMSG_19 = 19, |
484 | CHANNELMSG_20 = 20, |
485 | CHANNELMSG_TL_CONNECT_REQUEST = 21, |
486 | CHANNELMSG_MODIFYCHANNEL = 22, |
487 | CHANNELMSG_TL_CONNECT_RESULT = 23, |
488 | CHANNELMSG_MODIFYCHANNEL_RESPONSE = 24, |
489 | CHANNELMSG_COUNT |
490 | }; |
491 | |
492 | /* Hyper-V supports about 2048 channels, and the RELIDs start with 1. */ |
493 | #define INVALID_RELID U32_MAX |
494 | |
495 | struct { |
496 | enum vmbus_channel_message_type ; |
497 | u32 ; |
498 | } __packed; |
499 | |
500 | /* Query VMBus Version parameters */ |
501 | struct vmbus_channel_query_vmbus_version { |
502 | struct vmbus_channel_message_header ; |
503 | u32 version; |
504 | } __packed; |
505 | |
506 | /* VMBus Version Supported parameters */ |
507 | struct vmbus_channel_version_supported { |
508 | struct vmbus_channel_message_header ; |
509 | u8 version_supported; |
510 | } __packed; |
511 | |
512 | /* Offer Channel parameters */ |
513 | struct vmbus_channel_offer_channel { |
514 | struct vmbus_channel_message_header ; |
515 | struct vmbus_channel_offer offer; |
516 | u32 child_relid; |
517 | u8 monitorid; |
518 | /* |
519 | * win7 and beyond splits this field into a bit field. |
520 | */ |
521 | u8 monitor_allocated:1; |
522 | u8 reserved:7; |
523 | /* |
524 | * These are new fields added in win7 and later. |
525 | * Do not access these fields without checking the |
526 | * negotiated protocol. |
527 | * |
528 | * If "is_dedicated_interrupt" is set, we must not set the |
529 | * associated bit in the channel bitmap while sending the |
530 | * interrupt to the host. |
531 | * |
532 | * connection_id is to be used in signaling the host. |
533 | */ |
534 | u16 is_dedicated_interrupt:1; |
535 | u16 reserved1:15; |
536 | u32 connection_id; |
537 | } __packed; |
538 | |
539 | /* Rescind Offer parameters */ |
540 | struct vmbus_channel_rescind_offer { |
541 | struct vmbus_channel_message_header ; |
542 | u32 child_relid; |
543 | } __packed; |
544 | |
545 | /* |
546 | * Request Offer -- no parameters, SynIC message contains the partition ID |
547 | * Set Snoop -- no parameters, SynIC message contains the partition ID |
548 | * Clear Snoop -- no parameters, SynIC message contains the partition ID |
549 | * All Offers Delivered -- no parameters, SynIC message contains the partition |
550 | * ID |
551 | * Flush Client -- no parameters, SynIC message contains the partition ID |
552 | */ |
553 | |
554 | /* Open Channel parameters */ |
555 | struct vmbus_channel_open_channel { |
556 | struct vmbus_channel_message_header ; |
557 | |
558 | /* Identifies the specific VMBus channel that is being opened. */ |
559 | u32 child_relid; |
560 | |
561 | /* ID making a particular open request at a channel offer unique. */ |
562 | u32 openid; |
563 | |
564 | /* GPADL for the channel's ring buffer. */ |
565 | u32 ringbuffer_gpadlhandle; |
566 | |
567 | /* |
568 | * Starting with win8, this field will be used to specify |
569 | * the target virtual processor on which to deliver the interrupt for |
570 | * the host to guest communication. |
571 | * Prior to win8, incoming channel interrupts would only |
572 | * be delivered on cpu 0. Setting this value to 0 would |
573 | * preserve the earlier behavior. |
574 | */ |
575 | u32 target_vp; |
576 | |
577 | /* |
578 | * The upstream ring buffer begins at offset zero in the memory |
579 | * described by RingBufferGpadlHandle. The downstream ring buffer |
580 | * follows it at this offset (in pages). |
581 | */ |
582 | u32 downstream_ringbuffer_pageoffset; |
583 | |
584 | /* User-specific data to be passed along to the server endpoint. */ |
585 | unsigned char userdata[MAX_USER_DEFINED_BYTES]; |
586 | } __packed; |
587 | |
588 | /* Open Channel Result parameters */ |
589 | struct vmbus_channel_open_result { |
590 | struct vmbus_channel_message_header ; |
591 | u32 child_relid; |
592 | u32 openid; |
593 | u32 status; |
594 | } __packed; |
595 | |
596 | /* Modify Channel Result parameters */ |
597 | struct vmbus_channel_modifychannel_response { |
598 | struct vmbus_channel_message_header ; |
599 | u32 child_relid; |
600 | u32 status; |
601 | } __packed; |
602 | |
603 | /* Close channel parameters; */ |
604 | struct vmbus_channel_close_channel { |
605 | struct vmbus_channel_message_header ; |
606 | u32 child_relid; |
607 | } __packed; |
608 | |
609 | /* Channel Message GPADL */ |
610 | #define GPADL_TYPE_RING_BUFFER 1 |
611 | #define GPADL_TYPE_SERVER_SAVE_AREA 2 |
612 | #define GPADL_TYPE_TRANSACTION 8 |
613 | |
614 | /* |
615 | * The number of PFNs in a GPADL message is defined by the number of |
616 | * pages that would be spanned by ByteCount and ByteOffset. If the |
617 | * implied number of PFNs won't fit in this packet, there will be a |
618 | * follow-up packet that contains more. |
619 | */ |
620 | struct { |
621 | struct vmbus_channel_message_header ; |
622 | u32 ; |
623 | u32 ; |
624 | u16 ; |
625 | u16 ; |
626 | struct gpa_range []; |
627 | } __packed; |
628 | |
629 | /* This is the followup packet that contains more PFNs. */ |
630 | struct vmbus_channel_gpadl_body { |
631 | struct vmbus_channel_message_header header; |
632 | u32 msgnumber; |
633 | u32 gpadl; |
634 | u64 pfn[]; |
635 | } __packed; |
636 | |
637 | struct vmbus_channel_gpadl_created { |
638 | struct vmbus_channel_message_header ; |
639 | u32 child_relid; |
640 | u32 gpadl; |
641 | u32 creation_status; |
642 | } __packed; |
643 | |
644 | struct vmbus_channel_gpadl_teardown { |
645 | struct vmbus_channel_message_header ; |
646 | u32 child_relid; |
647 | u32 gpadl; |
648 | } __packed; |
649 | |
650 | struct vmbus_channel_gpadl_torndown { |
651 | struct vmbus_channel_message_header ; |
652 | u32 gpadl; |
653 | } __packed; |
654 | |
655 | struct vmbus_channel_relid_released { |
656 | struct vmbus_channel_message_header ; |
657 | u32 child_relid; |
658 | } __packed; |
659 | |
660 | struct vmbus_channel_initiate_contact { |
661 | struct vmbus_channel_message_header ; |
662 | u32 vmbus_version_requested; |
663 | u32 target_vcpu; /* The VCPU the host should respond to */ |
664 | union { |
665 | u64 interrupt_page; |
666 | struct { |
667 | u8 msg_sint; |
668 | u8 msg_vtl; |
669 | u8 reserved[6]; |
670 | }; |
671 | }; |
672 | u64 monitor_page1; |
673 | u64 monitor_page2; |
674 | } __packed; |
675 | |
676 | /* Hyper-V socket: guest's connect()-ing to host */ |
677 | struct vmbus_channel_tl_connect_request { |
678 | struct vmbus_channel_message_header ; |
679 | guid_t guest_endpoint_id; |
680 | guid_t host_service_id; |
681 | } __packed; |
682 | |
683 | /* Modify Channel parameters, cf. vmbus_send_modifychannel() */ |
684 | struct vmbus_channel_modifychannel { |
685 | struct vmbus_channel_message_header ; |
686 | u32 child_relid; |
687 | u32 target_vp; |
688 | } __packed; |
689 | |
690 | struct vmbus_channel_version_response { |
691 | struct vmbus_channel_message_header ; |
692 | u8 version_supported; |
693 | |
694 | u8 connection_state; |
695 | u16 padding; |
696 | |
697 | /* |
698 | * On new hosts that support VMBus protocol 5.0, we must use |
699 | * VMBUS_MESSAGE_CONNECTION_ID_4 for the Initiate Contact Message, |
700 | * and for subsequent messages, we must use the Message Connection ID |
701 | * field in the host-returned Version Response Message. |
702 | * |
703 | * On old hosts, we should always use VMBUS_MESSAGE_CONNECTION_ID (1). |
704 | */ |
705 | u32 msg_conn_id; |
706 | } __packed; |
707 | |
708 | enum vmbus_channel_state { |
709 | CHANNEL_OFFER_STATE, |
710 | CHANNEL_OPENING_STATE, |
711 | CHANNEL_OPEN_STATE, |
712 | CHANNEL_OPENED_STATE, |
713 | }; |
714 | |
715 | /* |
716 | * Represents each channel msg on the vmbus connection This is a |
717 | * variable-size data structure depending on the msg type itself |
718 | */ |
719 | struct vmbus_channel_msginfo { |
720 | /* Bookkeeping stuff */ |
721 | struct list_head msglistentry; |
722 | |
723 | /* So far, this is only used to handle gpadl body message */ |
724 | struct list_head submsglist; |
725 | |
726 | /* Synchronize the request/response if needed */ |
727 | struct completion waitevent; |
728 | struct vmbus_channel *waiting_channel; |
729 | union { |
730 | struct vmbus_channel_version_supported version_supported; |
731 | struct vmbus_channel_open_result open_result; |
732 | struct vmbus_channel_gpadl_torndown gpadl_torndown; |
733 | struct vmbus_channel_gpadl_created gpadl_created; |
734 | struct vmbus_channel_version_response version_response; |
735 | struct vmbus_channel_modifychannel_response modify_response; |
736 | } response; |
737 | |
738 | u32 msgsize; |
739 | /* |
740 | * The channel message that goes out on the "wire". |
741 | * It will contain at minimum the VMBUS_CHANNEL_MESSAGE_HEADER header |
742 | */ |
743 | unsigned char msg[]; |
744 | }; |
745 | |
746 | struct vmbus_close_msg { |
747 | struct vmbus_channel_msginfo info; |
748 | struct vmbus_channel_close_channel msg; |
749 | }; |
750 | |
751 | /* Define connection identifier type. */ |
752 | union hv_connection_id { |
753 | u32 asu32; |
754 | struct { |
755 | u32 id:24; |
756 | u32 reserved:8; |
757 | } u; |
758 | }; |
759 | |
760 | enum vmbus_device_type { |
761 | HV_IDE = 0, |
762 | HV_SCSI, |
763 | HV_FC, |
764 | HV_NIC, |
765 | HV_ND, |
766 | HV_PCIE, |
767 | HV_FB, |
768 | HV_KBD, |
769 | HV_MOUSE, |
770 | HV_KVP, |
771 | HV_TS, |
772 | HV_HB, |
773 | HV_SHUTDOWN, |
774 | HV_FCOPY, |
775 | HV_BACKUP, |
776 | HV_DM, |
777 | HV_UNKNOWN, |
778 | }; |
779 | |
780 | /* |
781 | * Provides request ids for VMBus. Encapsulates guest memory |
782 | * addresses and stores the next available slot in req_arr |
783 | * to generate new ids in constant time. |
784 | */ |
785 | struct vmbus_requestor { |
786 | u64 *req_arr; |
787 | unsigned long *req_bitmap; /* is a given slot available? */ |
788 | u32 size; |
789 | u64 next_request_id; |
790 | spinlock_t req_lock; /* provides atomicity */ |
791 | }; |
792 | |
793 | #define VMBUS_NO_RQSTOR U64_MAX |
794 | #define VMBUS_RQST_ERROR (U64_MAX - 1) |
795 | #define VMBUS_RQST_ADDR_ANY U64_MAX |
796 | /* NetVSC-specific */ |
797 | #define VMBUS_RQST_ID_NO_RESPONSE (U64_MAX - 2) |
798 | /* StorVSC-specific */ |
799 | #define VMBUS_RQST_INIT (U64_MAX - 2) |
800 | #define VMBUS_RQST_RESET (U64_MAX - 3) |
801 | |
802 | struct vmbus_device { |
803 | u16 dev_type; |
804 | guid_t guid; |
805 | bool perf_device; |
806 | bool allowed_in_isolated; |
807 | }; |
808 | |
809 | #define VMBUS_DEFAULT_MAX_PKT_SIZE 4096 |
810 | |
811 | struct vmbus_gpadl { |
812 | u32 gpadl_handle; |
813 | u32 size; |
814 | void *buffer; |
815 | }; |
816 | |
817 | struct vmbus_channel { |
818 | struct list_head listentry; |
819 | |
820 | struct hv_device *device_obj; |
821 | |
822 | enum vmbus_channel_state state; |
823 | |
824 | struct vmbus_channel_offer_channel offermsg; |
825 | /* |
826 | * These are based on the OfferMsg.MonitorId. |
827 | * Save it here for easy access. |
828 | */ |
829 | u8 monitor_grp; |
830 | u8 monitor_bit; |
831 | |
832 | bool rescind; /* got rescind msg */ |
833 | bool rescind_ref; /* got rescind msg, got channel reference */ |
834 | struct completion rescind_event; |
835 | |
836 | struct vmbus_gpadl ringbuffer_gpadlhandle; |
837 | |
838 | /* Allocated memory for ring buffer */ |
839 | struct page *ringbuffer_page; |
840 | u32 ringbuffer_pagecount; |
841 | u32 ringbuffer_send_offset; |
842 | struct hv_ring_buffer_info outbound; /* send to parent */ |
843 | struct hv_ring_buffer_info inbound; /* receive from parent */ |
844 | |
845 | struct vmbus_close_msg close_msg; |
846 | |
847 | /* Statistics */ |
848 | u64 interrupts; /* Host to Guest interrupts */ |
849 | u64 sig_events; /* Guest to Host events */ |
850 | |
851 | /* |
852 | * Guest to host interrupts caused by the outbound ring buffer changing |
853 | * from empty to not empty. |
854 | */ |
855 | u64 intr_out_empty; |
856 | |
857 | /* |
858 | * Indicates that a full outbound ring buffer was encountered. The flag |
859 | * is set to true when a full outbound ring buffer is encountered and |
860 | * set to false when a write to the outbound ring buffer is completed. |
861 | */ |
862 | bool out_full_flag; |
863 | |
864 | /* Channel callback's invoked in softirq context */ |
865 | struct tasklet_struct callback_event; |
866 | void (*onchannel_callback)(void *context); |
867 | void *channel_callback_context; |
868 | |
869 | void (*change_target_cpu_callback)(struct vmbus_channel *channel, |
870 | u32 old, u32 new); |
871 | |
872 | /* |
873 | * Synchronize channel scheduling and channel removal; see the inline |
874 | * comments in vmbus_chan_sched() and vmbus_reset_channel_cb(). |
875 | */ |
876 | spinlock_t sched_lock; |
877 | |
878 | /* |
879 | * A channel can be marked for one of three modes of reading: |
880 | * BATCHED - callback called from taslket and should read |
881 | * channel until empty. Interrupts from the host |
882 | * are masked while read is in process (default). |
883 | * DIRECT - callback called from tasklet (softirq). |
884 | * ISR - callback called in interrupt context and must |
885 | * invoke its own deferred processing. |
886 | * Host interrupts are disabled and must be re-enabled |
887 | * when ring is empty. |
888 | */ |
889 | enum hv_callback_mode { |
890 | HV_CALL_BATCHED, |
891 | HV_CALL_DIRECT, |
892 | HV_CALL_ISR |
893 | } callback_mode; |
894 | |
895 | bool is_dedicated_interrupt; |
896 | u64 sig_event; |
897 | |
898 | /* |
899 | * Starting with win8, this field will be used to specify the |
900 | * target CPU on which to deliver the interrupt for the host |
901 | * to guest communication. |
902 | * |
903 | * Prior to win8, incoming channel interrupts would only be |
904 | * delivered on CPU 0. Setting this value to 0 would preserve |
905 | * the earlier behavior. |
906 | */ |
907 | u32 target_cpu; |
908 | /* |
909 | * Support for sub-channels. For high performance devices, |
910 | * it will be useful to have multiple sub-channels to support |
911 | * a scalable communication infrastructure with the host. |
912 | * The support for sub-channels is implemented as an extension |
913 | * to the current infrastructure. |
914 | * The initial offer is considered the primary channel and this |
915 | * offer message will indicate if the host supports sub-channels. |
916 | * The guest is free to ask for sub-channels to be offered and can |
917 | * open these sub-channels as a normal "primary" channel. However, |
918 | * all sub-channels will have the same type and instance guids as the |
919 | * primary channel. Requests sent on a given channel will result in a |
920 | * response on the same channel. |
921 | */ |
922 | |
923 | /* |
924 | * Sub-channel creation callback. This callback will be called in |
925 | * process context when a sub-channel offer is received from the host. |
926 | * The guest can open the sub-channel in the context of this callback. |
927 | */ |
928 | void (*sc_creation_callback)(struct vmbus_channel *new_sc); |
929 | |
930 | /* |
931 | * Channel rescind callback. Some channels (the hvsock ones), need to |
932 | * register a callback which is invoked in vmbus_onoffer_rescind(). |
933 | */ |
934 | void (*chn_rescind_callback)(struct vmbus_channel *channel); |
935 | |
936 | /* |
937 | * All Sub-channels of a primary channel are linked here. |
938 | */ |
939 | struct list_head sc_list; |
940 | /* |
941 | * The primary channel this sub-channel belongs to. |
942 | * This will be NULL for the primary channel. |
943 | */ |
944 | struct vmbus_channel *primary_channel; |
945 | /* |
946 | * Support per-channel state for use by vmbus drivers. |
947 | */ |
948 | void *per_channel_state; |
949 | |
950 | /* |
951 | * Defer freeing channel until after all cpu's have |
952 | * gone through grace period. |
953 | */ |
954 | struct rcu_head rcu; |
955 | |
956 | /* |
957 | * For sysfs per-channel properties. |
958 | */ |
959 | struct kobject kobj; |
960 | |
961 | /* |
962 | * For performance critical channels (storage, networking |
963 | * etc,), Hyper-V has a mechanism to enhance the throughput |
964 | * at the expense of latency: |
965 | * When the host is to be signaled, we just set a bit in a shared page |
966 | * and this bit will be inspected by the hypervisor within a certain |
967 | * window and if the bit is set, the host will be signaled. The window |
968 | * of time is the monitor latency - currently around 100 usecs. This |
969 | * mechanism improves throughput by: |
970 | * |
971 | * A) Making the host more efficient - each time it wakes up, |
972 | * potentially it will process more number of packets. The |
973 | * monitor latency allows a batch to build up. |
974 | * B) By deferring the hypercall to signal, we will also minimize |
975 | * the interrupts. |
976 | * |
977 | * Clearly, these optimizations improve throughput at the expense of |
978 | * latency. Furthermore, since the channel is shared for both |
979 | * control and data messages, control messages currently suffer |
980 | * unnecessary latency adversely impacting performance and boot |
981 | * time. To fix this issue, permit tagging the channel as being |
982 | * in "low latency" mode. In this mode, we will bypass the monitor |
983 | * mechanism. |
984 | */ |
985 | bool low_latency; |
986 | |
987 | bool probe_done; |
988 | |
989 | /* |
990 | * Cache the device ID here for easy access; this is useful, in |
991 | * particular, in situations where the channel's device_obj has |
992 | * not been allocated/initialized yet. |
993 | */ |
994 | u16 device_id; |
995 | |
996 | /* |
997 | * We must offload the handling of the primary/sub channels |
998 | * from the single-threaded vmbus_connection.work_queue to |
999 | * two different workqueue, otherwise we can block |
1000 | * vmbus_connection.work_queue and hang: see vmbus_process_offer(). |
1001 | */ |
1002 | struct work_struct add_channel_work; |
1003 | |
1004 | /* |
1005 | * Guest to host interrupts caused by the inbound ring buffer changing |
1006 | * from full to not full while a packet is waiting. |
1007 | */ |
1008 | u64 intr_in_full; |
1009 | |
1010 | /* |
1011 | * The total number of write operations that encountered a full |
1012 | * outbound ring buffer. |
1013 | */ |
1014 | u64 out_full_total; |
1015 | |
1016 | /* |
1017 | * The number of write operations that were the first to encounter a |
1018 | * full outbound ring buffer. |
1019 | */ |
1020 | u64 out_full_first; |
1021 | |
1022 | /* enabling/disabling fuzz testing on the channel (default is false)*/ |
1023 | bool fuzz_testing_state; |
1024 | |
1025 | /* |
1026 | * Interrupt delay will delay the guest from emptying the ring buffer |
1027 | * for a specific amount of time. The delay is in microseconds and will |
1028 | * be between 1 to a maximum of 1000, its default is 0 (no delay). |
1029 | * The Message delay will delay guest reading on a per message basis |
1030 | * in microseconds between 1 to 1000 with the default being 0 |
1031 | * (no delay). |
1032 | */ |
1033 | u32 fuzz_testing_interrupt_delay; |
1034 | u32 fuzz_testing_message_delay; |
1035 | |
1036 | /* callback to generate a request ID from a request address */ |
1037 | u64 (*next_request_id_callback)(struct vmbus_channel *channel, u64 rqst_addr); |
1038 | /* callback to retrieve a request address from a request ID */ |
1039 | u64 (*request_addr_callback)(struct vmbus_channel *channel, u64 rqst_id); |
1040 | |
1041 | /* request/transaction ids for VMBus */ |
1042 | struct vmbus_requestor requestor; |
1043 | u32 rqstor_size; |
1044 | |
1045 | /* The max size of a packet on this channel */ |
1046 | u32 max_pkt_size; |
1047 | }; |
1048 | |
1049 | #define lock_requestor(channel, flags) \ |
1050 | do { \ |
1051 | struct vmbus_requestor *rqstor = &(channel)->requestor; \ |
1052 | \ |
1053 | spin_lock_irqsave(&rqstor->req_lock, flags); \ |
1054 | } while (0) |
1055 | |
1056 | static __always_inline void unlock_requestor(struct vmbus_channel *channel, |
1057 | unsigned long flags) |
1058 | { |
1059 | struct vmbus_requestor *rqstor = &channel->requestor; |
1060 | |
1061 | spin_unlock_irqrestore(lock: &rqstor->req_lock, flags); |
1062 | } |
1063 | |
1064 | u64 vmbus_next_request_id(struct vmbus_channel *channel, u64 rqst_addr); |
1065 | u64 __vmbus_request_addr_match(struct vmbus_channel *channel, u64 trans_id, |
1066 | u64 rqst_addr); |
1067 | u64 vmbus_request_addr_match(struct vmbus_channel *channel, u64 trans_id, |
1068 | u64 rqst_addr); |
1069 | u64 vmbus_request_addr(struct vmbus_channel *channel, u64 trans_id); |
1070 | |
1071 | static inline bool is_hvsock_offer(const struct vmbus_channel_offer_channel *o) |
1072 | { |
1073 | return !!(o->offer.chn_flags & VMBUS_CHANNEL_TLNPI_PROVIDER_OFFER); |
1074 | } |
1075 | |
1076 | static inline bool is_hvsock_channel(const struct vmbus_channel *c) |
1077 | { |
1078 | return is_hvsock_offer(o: &c->offermsg); |
1079 | } |
1080 | |
1081 | static inline bool is_sub_channel(const struct vmbus_channel *c) |
1082 | { |
1083 | return c->offermsg.offer.sub_channel_index != 0; |
1084 | } |
1085 | |
1086 | static inline void set_channel_read_mode(struct vmbus_channel *c, |
1087 | enum hv_callback_mode mode) |
1088 | { |
1089 | c->callback_mode = mode; |
1090 | } |
1091 | |
1092 | static inline void set_per_channel_state(struct vmbus_channel *c, void *s) |
1093 | { |
1094 | c->per_channel_state = s; |
1095 | } |
1096 | |
1097 | static inline void *get_per_channel_state(struct vmbus_channel *c) |
1098 | { |
1099 | return c->per_channel_state; |
1100 | } |
1101 | |
1102 | static inline void set_channel_pending_send_size(struct vmbus_channel *c, |
1103 | u32 size) |
1104 | { |
1105 | unsigned long flags; |
1106 | |
1107 | if (size) { |
1108 | spin_lock_irqsave(&c->outbound.ring_lock, flags); |
1109 | ++c->out_full_total; |
1110 | |
1111 | if (!c->out_full_flag) { |
1112 | ++c->out_full_first; |
1113 | c->out_full_flag = true; |
1114 | } |
1115 | spin_unlock_irqrestore(lock: &c->outbound.ring_lock, flags); |
1116 | } else { |
1117 | c->out_full_flag = false; |
1118 | } |
1119 | |
1120 | c->outbound.ring_buffer->pending_send_sz = size; |
1121 | } |
1122 | |
1123 | void vmbus_onmessage(struct vmbus_channel_message_header *hdr); |
1124 | |
1125 | int vmbus_request_offers(void); |
1126 | |
1127 | /* |
1128 | * APIs for managing sub-channels. |
1129 | */ |
1130 | |
1131 | void vmbus_set_sc_create_callback(struct vmbus_channel *primary_channel, |
1132 | void (*sc_cr_cb)(struct vmbus_channel *new_sc)); |
1133 | |
1134 | void vmbus_set_chn_rescind_callback(struct vmbus_channel *channel, |
1135 | void (*chn_rescind_cb)(struct vmbus_channel *)); |
1136 | |
1137 | /* The format must be the same as struct vmdata_gpa_direct */ |
1138 | struct vmbus_channel_packet_page_buffer { |
1139 | u16 type; |
1140 | u16 dataoffset8; |
1141 | u16 length8; |
1142 | u16 flags; |
1143 | u64 transactionid; |
1144 | u32 reserved; |
1145 | u32 rangecount; |
1146 | struct hv_page_buffer range[MAX_PAGE_BUFFER_COUNT]; |
1147 | } __packed; |
1148 | |
1149 | /* The format must be the same as struct vmdata_gpa_direct */ |
1150 | struct vmbus_channel_packet_multipage_buffer { |
1151 | u16 type; |
1152 | u16 dataoffset8; |
1153 | u16 length8; |
1154 | u16 flags; |
1155 | u64 transactionid; |
1156 | u32 reserved; |
1157 | u32 rangecount; /* Always 1 in this case */ |
1158 | struct hv_multipage_buffer range; |
1159 | } __packed; |
1160 | |
1161 | /* The format must be the same as struct vmdata_gpa_direct */ |
1162 | struct vmbus_packet_mpb_array { |
1163 | u16 type; |
1164 | u16 dataoffset8; |
1165 | u16 length8; |
1166 | u16 flags; |
1167 | u64 transactionid; |
1168 | u32 reserved; |
1169 | u32 rangecount; /* Always 1 in this case */ |
1170 | struct hv_mpb_array range; |
1171 | } __packed; |
1172 | |
1173 | int vmbus_alloc_ring(struct vmbus_channel *channel, |
1174 | u32 send_size, u32 recv_size); |
1175 | void vmbus_free_ring(struct vmbus_channel *channel); |
1176 | |
1177 | int vmbus_connect_ring(struct vmbus_channel *channel, |
1178 | void (*onchannel_callback)(void *context), |
1179 | void *context); |
1180 | int vmbus_disconnect_ring(struct vmbus_channel *channel); |
1181 | |
1182 | extern int vmbus_open(struct vmbus_channel *channel, |
1183 | u32 send_ringbuffersize, |
1184 | u32 recv_ringbuffersize, |
1185 | void *userdata, |
1186 | u32 userdatalen, |
1187 | void (*onchannel_callback)(void *context), |
1188 | void *context); |
1189 | |
1190 | extern void vmbus_close(struct vmbus_channel *channel); |
1191 | |
1192 | extern int vmbus_sendpacket_getid(struct vmbus_channel *channel, |
1193 | void *buffer, |
1194 | u32 bufferLen, |
1195 | u64 requestid, |
1196 | u64 *trans_id, |
1197 | enum vmbus_packet_type type, |
1198 | u32 flags); |
1199 | extern int vmbus_sendpacket(struct vmbus_channel *channel, |
1200 | void *buffer, |
1201 | u32 bufferLen, |
1202 | u64 requestid, |
1203 | enum vmbus_packet_type type, |
1204 | u32 flags); |
1205 | |
1206 | extern int vmbus_sendpacket_pagebuffer(struct vmbus_channel *channel, |
1207 | struct hv_page_buffer pagebuffers[], |
1208 | u32 pagecount, |
1209 | void *buffer, |
1210 | u32 bufferlen, |
1211 | u64 requestid); |
1212 | |
1213 | extern int vmbus_sendpacket_mpb_desc(struct vmbus_channel *channel, |
1214 | struct vmbus_packet_mpb_array *mpb, |
1215 | u32 desc_size, |
1216 | void *buffer, |
1217 | u32 bufferlen, |
1218 | u64 requestid); |
1219 | |
1220 | extern int vmbus_establish_gpadl(struct vmbus_channel *channel, |
1221 | void *kbuffer, |
1222 | u32 size, |
1223 | struct vmbus_gpadl *gpadl); |
1224 | |
1225 | extern int vmbus_teardown_gpadl(struct vmbus_channel *channel, |
1226 | struct vmbus_gpadl *gpadl); |
1227 | |
1228 | void vmbus_reset_channel_cb(struct vmbus_channel *channel); |
1229 | |
1230 | extern int vmbus_recvpacket(struct vmbus_channel *channel, |
1231 | void *buffer, |
1232 | u32 bufferlen, |
1233 | u32 *buffer_actual_len, |
1234 | u64 *requestid); |
1235 | |
1236 | extern int vmbus_recvpacket_raw(struct vmbus_channel *channel, |
1237 | void *buffer, |
1238 | u32 bufferlen, |
1239 | u32 *buffer_actual_len, |
1240 | u64 *requestid); |
1241 | |
1242 | /* Base driver object */ |
1243 | struct hv_driver { |
1244 | const char *name; |
1245 | |
1246 | /* |
1247 | * A hvsock offer, which has a VMBUS_CHANNEL_TLNPI_PROVIDER_OFFER |
1248 | * channel flag, actually doesn't mean a synthetic device because the |
1249 | * offer's if_type/if_instance can change for every new hvsock |
1250 | * connection. |
1251 | * |
1252 | * However, to facilitate the notification of new-offer/rescind-offer |
1253 | * from vmbus driver to hvsock driver, we can handle hvsock offer as |
1254 | * a special vmbus device, and hence we need the below flag to |
1255 | * indicate if the driver is the hvsock driver or not: we need to |
1256 | * specially treat the hvosck offer & driver in vmbus_match(). |
1257 | */ |
1258 | bool hvsock; |
1259 | |
1260 | /* the device type supported by this driver */ |
1261 | guid_t dev_type; |
1262 | const struct hv_vmbus_device_id *id_table; |
1263 | |
1264 | struct device_driver driver; |
1265 | |
1266 | /* dynamic device GUID's */ |
1267 | struct { |
1268 | spinlock_t lock; |
1269 | struct list_head list; |
1270 | } dynids; |
1271 | |
1272 | int (*probe)(struct hv_device *, const struct hv_vmbus_device_id *); |
1273 | void (*remove)(struct hv_device *dev); |
1274 | void (*shutdown)(struct hv_device *); |
1275 | |
1276 | int (*suspend)(struct hv_device *); |
1277 | int (*resume)(struct hv_device *); |
1278 | |
1279 | }; |
1280 | |
1281 | /* Base device object */ |
1282 | struct hv_device { |
1283 | /* the device type id of this device */ |
1284 | guid_t dev_type; |
1285 | |
1286 | /* the device instance id of this device */ |
1287 | guid_t dev_instance; |
1288 | u16 vendor_id; |
1289 | u16 device_id; |
1290 | |
1291 | struct device device; |
1292 | /* |
1293 | * Driver name to force a match. Do not set directly, because core |
1294 | * frees it. Use driver_set_override() to set or clear it. |
1295 | */ |
1296 | const char *driver_override; |
1297 | |
1298 | struct vmbus_channel *channel; |
1299 | struct kset *channels_kset; |
1300 | struct device_dma_parameters dma_parms; |
1301 | u64 dma_mask; |
1302 | |
1303 | /* place holder to keep track of the dir for hv device in debugfs */ |
1304 | struct dentry *debug_dir; |
1305 | |
1306 | }; |
1307 | |
1308 | |
1309 | #define device_to_hv_device(d) container_of_const(d, struct hv_device, device) |
1310 | |
1311 | static inline struct hv_driver *drv_to_hv_drv(struct device_driver *d) |
1312 | { |
1313 | return container_of(d, struct hv_driver, driver); |
1314 | } |
1315 | |
1316 | static inline void hv_set_drvdata(struct hv_device *dev, void *data) |
1317 | { |
1318 | dev_set_drvdata(dev: &dev->device, data); |
1319 | } |
1320 | |
1321 | static inline void *hv_get_drvdata(struct hv_device *dev) |
1322 | { |
1323 | return dev_get_drvdata(dev: &dev->device); |
1324 | } |
1325 | |
1326 | struct hv_ring_buffer_debug_info { |
1327 | u32 current_interrupt_mask; |
1328 | u32 current_read_index; |
1329 | u32 current_write_index; |
1330 | u32 bytes_avail_toread; |
1331 | u32 bytes_avail_towrite; |
1332 | }; |
1333 | |
1334 | |
1335 | int hv_ringbuffer_get_debuginfo(struct hv_ring_buffer_info *ring_info, |
1336 | struct hv_ring_buffer_debug_info *debug_info); |
1337 | |
1338 | bool hv_ringbuffer_spinlock_busy(struct vmbus_channel *channel); |
1339 | |
1340 | /* Vmbus interface */ |
1341 | #define vmbus_driver_register(driver) \ |
1342 | __vmbus_driver_register(driver, THIS_MODULE, KBUILD_MODNAME) |
1343 | int __must_check __vmbus_driver_register(struct hv_driver *hv_driver, |
1344 | struct module *owner, |
1345 | const char *mod_name); |
1346 | void vmbus_driver_unregister(struct hv_driver *hv_driver); |
1347 | |
1348 | void vmbus_hvsock_device_unregister(struct vmbus_channel *channel); |
1349 | |
1350 | int vmbus_allocate_mmio(struct resource **new, struct hv_device *device_obj, |
1351 | resource_size_t min, resource_size_t max, |
1352 | resource_size_t size, resource_size_t align, |
1353 | bool fb_overlap_ok); |
1354 | void vmbus_free_mmio(resource_size_t start, resource_size_t size); |
1355 | |
1356 | /* |
1357 | * GUID definitions of various offer types - services offered to the guest. |
1358 | */ |
1359 | |
1360 | /* |
1361 | * Network GUID |
1362 | * {f8615163-df3e-46c5-913f-f2d2f965ed0e} |
1363 | */ |
1364 | #define HV_NIC_GUID \ |
1365 | .guid = GUID_INIT(0xf8615163, 0xdf3e, 0x46c5, 0x91, 0x3f, \ |
1366 | 0xf2, 0xd2, 0xf9, 0x65, 0xed, 0x0e) |
1367 | |
1368 | /* |
1369 | * IDE GUID |
1370 | * {32412632-86cb-44a2-9b5c-50d1417354f5} |
1371 | */ |
1372 | #define HV_IDE_GUID \ |
1373 | .guid = GUID_INIT(0x32412632, 0x86cb, 0x44a2, 0x9b, 0x5c, \ |
1374 | 0x50, 0xd1, 0x41, 0x73, 0x54, 0xf5) |
1375 | |
1376 | /* |
1377 | * SCSI GUID |
1378 | * {ba6163d9-04a1-4d29-b605-72e2ffb1dc7f} |
1379 | */ |
1380 | #define HV_SCSI_GUID \ |
1381 | .guid = GUID_INIT(0xba6163d9, 0x04a1, 0x4d29, 0xb6, 0x05, \ |
1382 | 0x72, 0xe2, 0xff, 0xb1, 0xdc, 0x7f) |
1383 | |
1384 | /* |
1385 | * Shutdown GUID |
1386 | * {0e0b6031-5213-4934-818b-38d90ced39db} |
1387 | */ |
1388 | #define HV_SHUTDOWN_GUID \ |
1389 | .guid = GUID_INIT(0x0e0b6031, 0x5213, 0x4934, 0x81, 0x8b, \ |
1390 | 0x38, 0xd9, 0x0c, 0xed, 0x39, 0xdb) |
1391 | |
1392 | /* |
1393 | * Time Synch GUID |
1394 | * {9527E630-D0AE-497b-ADCE-E80AB0175CAF} |
1395 | */ |
1396 | #define HV_TS_GUID \ |
1397 | .guid = GUID_INIT(0x9527e630, 0xd0ae, 0x497b, 0xad, 0xce, \ |
1398 | 0xe8, 0x0a, 0xb0, 0x17, 0x5c, 0xaf) |
1399 | |
1400 | /* |
1401 | * Heartbeat GUID |
1402 | * {57164f39-9115-4e78-ab55-382f3bd5422d} |
1403 | */ |
1404 | #define HV_HEART_BEAT_GUID \ |
1405 | .guid = GUID_INIT(0x57164f39, 0x9115, 0x4e78, 0xab, 0x55, \ |
1406 | 0x38, 0x2f, 0x3b, 0xd5, 0x42, 0x2d) |
1407 | |
1408 | /* |
1409 | * KVP GUID |
1410 | * {a9a0f4e7-5a45-4d96-b827-8a841e8c03e6} |
1411 | */ |
1412 | #define HV_KVP_GUID \ |
1413 | .guid = GUID_INIT(0xa9a0f4e7, 0x5a45, 0x4d96, 0xb8, 0x27, \ |
1414 | 0x8a, 0x84, 0x1e, 0x8c, 0x03, 0xe6) |
1415 | |
1416 | /* |
1417 | * Dynamic memory GUID |
1418 | * {525074dc-8985-46e2-8057-a307dc18a502} |
1419 | */ |
1420 | #define HV_DM_GUID \ |
1421 | .guid = GUID_INIT(0x525074dc, 0x8985, 0x46e2, 0x80, 0x57, \ |
1422 | 0xa3, 0x07, 0xdc, 0x18, 0xa5, 0x02) |
1423 | |
1424 | /* |
1425 | * Mouse GUID |
1426 | * {cfa8b69e-5b4a-4cc0-b98b-8ba1a1f3f95a} |
1427 | */ |
1428 | #define HV_MOUSE_GUID \ |
1429 | .guid = GUID_INIT(0xcfa8b69e, 0x5b4a, 0x4cc0, 0xb9, 0x8b, \ |
1430 | 0x8b, 0xa1, 0xa1, 0xf3, 0xf9, 0x5a) |
1431 | |
1432 | /* |
1433 | * Keyboard GUID |
1434 | * {f912ad6d-2b17-48ea-bd65-f927a61c7684} |
1435 | */ |
1436 | #define HV_KBD_GUID \ |
1437 | .guid = GUID_INIT(0xf912ad6d, 0x2b17, 0x48ea, 0xbd, 0x65, \ |
1438 | 0xf9, 0x27, 0xa6, 0x1c, 0x76, 0x84) |
1439 | |
1440 | /* |
1441 | * VSS (Backup/Restore) GUID |
1442 | */ |
1443 | #define HV_VSS_GUID \ |
1444 | .guid = GUID_INIT(0x35fa2e29, 0xea23, 0x4236, 0x96, 0xae, \ |
1445 | 0x3a, 0x6e, 0xba, 0xcb, 0xa4, 0x40) |
1446 | /* |
1447 | * Synthetic Video GUID |
1448 | * {DA0A7802-E377-4aac-8E77-0558EB1073F8} |
1449 | */ |
1450 | #define HV_SYNTHVID_GUID \ |
1451 | .guid = GUID_INIT(0xda0a7802, 0xe377, 0x4aac, 0x8e, 0x77, \ |
1452 | 0x05, 0x58, 0xeb, 0x10, 0x73, 0xf8) |
1453 | |
1454 | /* |
1455 | * Synthetic FC GUID |
1456 | * {2f9bcc4a-0069-4af3-b76b-6fd0be528cda} |
1457 | */ |
1458 | #define HV_SYNTHFC_GUID \ |
1459 | .guid = GUID_INIT(0x2f9bcc4a, 0x0069, 0x4af3, 0xb7, 0x6b, \ |
1460 | 0x6f, 0xd0, 0xbe, 0x52, 0x8c, 0xda) |
1461 | |
1462 | /* |
1463 | * Guest File Copy Service |
1464 | * {34D14BE3-DEE4-41c8-9AE7-6B174977C192} |
1465 | */ |
1466 | |
1467 | #define HV_FCOPY_GUID \ |
1468 | .guid = GUID_INIT(0x34d14be3, 0xdee4, 0x41c8, 0x9a, 0xe7, \ |
1469 | 0x6b, 0x17, 0x49, 0x77, 0xc1, 0x92) |
1470 | |
1471 | /* |
1472 | * NetworkDirect. This is the guest RDMA service. |
1473 | * {8c2eaf3d-32a7-4b09-ab99-bd1f1c86b501} |
1474 | */ |
1475 | #define HV_ND_GUID \ |
1476 | .guid = GUID_INIT(0x8c2eaf3d, 0x32a7, 0x4b09, 0xab, 0x99, \ |
1477 | 0xbd, 0x1f, 0x1c, 0x86, 0xb5, 0x01) |
1478 | |
1479 | /* |
1480 | * PCI Express Pass Through |
1481 | * {44C4F61D-4444-4400-9D52-802E27EDE19F} |
1482 | */ |
1483 | |
1484 | #define HV_PCIE_GUID \ |
1485 | .guid = GUID_INIT(0x44c4f61d, 0x4444, 0x4400, 0x9d, 0x52, \ |
1486 | 0x80, 0x2e, 0x27, 0xed, 0xe1, 0x9f) |
1487 | |
1488 | /* |
1489 | * Linux doesn't support these 4 devices: the first two are for |
1490 | * Automatic Virtual Machine Activation, the third is for |
1491 | * Remote Desktop Virtualization, and the fourth is Initial |
1492 | * Machine Configuration (IMC) used only by Windows guests. |
1493 | * {f8e65716-3cb3-4a06-9a60-1889c5cccab5} |
1494 | * {3375baf4-9e15-4b30-b765-67acb10d607b} |
1495 | * {276aacf4-ac15-426c-98dd-7521ad3f01fe} |
1496 | * {c376c1c3-d276-48d2-90a9-c04748072c60} |
1497 | */ |
1498 | |
1499 | #define HV_AVMA1_GUID \ |
1500 | .guid = GUID_INIT(0xf8e65716, 0x3cb3, 0x4a06, 0x9a, 0x60, \ |
1501 | 0x18, 0x89, 0xc5, 0xcc, 0xca, 0xb5) |
1502 | |
1503 | #define HV_AVMA2_GUID \ |
1504 | .guid = GUID_INIT(0x3375baf4, 0x9e15, 0x4b30, 0xb7, 0x65, \ |
1505 | 0x67, 0xac, 0xb1, 0x0d, 0x60, 0x7b) |
1506 | |
1507 | #define HV_RDV_GUID \ |
1508 | .guid = GUID_INIT(0x276aacf4, 0xac15, 0x426c, 0x98, 0xdd, \ |
1509 | 0x75, 0x21, 0xad, 0x3f, 0x01, 0xfe) |
1510 | |
1511 | #define HV_IMC_GUID \ |
1512 | .guid = GUID_INIT(0xc376c1c3, 0xd276, 0x48d2, 0x90, 0xa9, \ |
1513 | 0xc0, 0x47, 0x48, 0x07, 0x2c, 0x60) |
1514 | |
1515 | /* |
1516 | * Common header for Hyper-V ICs |
1517 | */ |
1518 | |
1519 | #define ICMSGTYPE_NEGOTIATE 0 |
1520 | #define ICMSGTYPE_HEARTBEAT 1 |
1521 | #define ICMSGTYPE_KVPEXCHANGE 2 |
1522 | #define ICMSGTYPE_SHUTDOWN 3 |
1523 | #define ICMSGTYPE_TIMESYNC 4 |
1524 | #define ICMSGTYPE_VSS 5 |
1525 | #define ICMSGTYPE_FCOPY 7 |
1526 | |
1527 | #define ICMSGHDRFLAG_TRANSACTION 1 |
1528 | #define ICMSGHDRFLAG_REQUEST 2 |
1529 | #define ICMSGHDRFLAG_RESPONSE 4 |
1530 | |
1531 | |
1532 | /* |
1533 | * While we want to handle util services as regular devices, |
1534 | * there is only one instance of each of these services; so |
1535 | * we statically allocate the service specific state. |
1536 | */ |
1537 | |
1538 | struct hv_util_service { |
1539 | u8 *recv_buffer; |
1540 | void *channel; |
1541 | void (*util_cb)(void *); |
1542 | int (*util_init)(struct hv_util_service *); |
1543 | void (*util_deinit)(void); |
1544 | int (*util_pre_suspend)(void); |
1545 | int (*util_pre_resume)(void); |
1546 | }; |
1547 | |
1548 | struct vmbuspipe_hdr { |
1549 | u32 flags; |
1550 | u32 msgsize; |
1551 | } __packed; |
1552 | |
1553 | struct ic_version { |
1554 | u16 major; |
1555 | u16 minor; |
1556 | } __packed; |
1557 | |
1558 | struct icmsg_hdr { |
1559 | struct ic_version icverframe; |
1560 | u16 icmsgtype; |
1561 | struct ic_version icvermsg; |
1562 | u16 icmsgsize; |
1563 | u32 status; |
1564 | u8 ictransaction_id; |
1565 | u8 icflags; |
1566 | u8 reserved[2]; |
1567 | } __packed; |
1568 | |
1569 | #define IC_VERSION_NEGOTIATION_MAX_VER_COUNT 100 |
1570 | #define ICMSG_HDR (sizeof(struct vmbuspipe_hdr) + sizeof(struct icmsg_hdr)) |
1571 | #define ICMSG_NEGOTIATE_PKT_SIZE(icframe_vercnt, icmsg_vercnt) \ |
1572 | (ICMSG_HDR + sizeof(struct icmsg_negotiate) + \ |
1573 | (((icframe_vercnt) + (icmsg_vercnt)) * sizeof(struct ic_version))) |
1574 | |
1575 | struct icmsg_negotiate { |
1576 | u16 icframe_vercnt; |
1577 | u16 icmsg_vercnt; |
1578 | u32 reserved; |
1579 | struct ic_version icversion_data[]; /* any size array */ |
1580 | } __packed; |
1581 | |
1582 | struct shutdown_msg_data { |
1583 | u32 reason_code; |
1584 | u32 timeout_seconds; |
1585 | u32 flags; |
1586 | u8 display_message[2048]; |
1587 | } __packed; |
1588 | |
1589 | struct heartbeat_msg_data { |
1590 | u64 seq_num; |
1591 | u32 reserved[8]; |
1592 | } __packed; |
1593 | |
1594 | /* Time Sync IC defs */ |
1595 | #define ICTIMESYNCFLAG_PROBE 0 |
1596 | #define ICTIMESYNCFLAG_SYNC 1 |
1597 | #define ICTIMESYNCFLAG_SAMPLE 2 |
1598 | |
1599 | #ifdef __x86_64__ |
1600 | #define WLTIMEDELTA 116444736000000000L /* in 100ns unit */ |
1601 | #else |
1602 | #define WLTIMEDELTA 116444736000000000LL |
1603 | #endif |
1604 | |
1605 | struct ictimesync_data { |
1606 | u64 parenttime; |
1607 | u64 childtime; |
1608 | u64 roundtriptime; |
1609 | u8 flags; |
1610 | } __packed; |
1611 | |
1612 | struct ictimesync_ref_data { |
1613 | u64 parenttime; |
1614 | u64 vmreferencetime; |
1615 | u8 flags; |
1616 | char leapflags; |
1617 | char stratum; |
1618 | u8 reserved[3]; |
1619 | } __packed; |
1620 | |
1621 | struct hyperv_service_callback { |
1622 | u8 msg_type; |
1623 | char *log_msg; |
1624 | guid_t data; |
1625 | struct vmbus_channel *channel; |
1626 | void (*callback)(void *context); |
1627 | }; |
1628 | |
1629 | struct hv_dma_range { |
1630 | dma_addr_t dma; |
1631 | u32 mapping_size; |
1632 | }; |
1633 | |
1634 | #define MAX_SRV_VER 0x7ffffff |
1635 | extern bool vmbus_prep_negotiate_resp(struct icmsg_hdr *icmsghdrp, u8 *buf, u32 buflen, |
1636 | const int *fw_version, int fw_vercnt, |
1637 | const int *srv_version, int srv_vercnt, |
1638 | int *nego_fw_version, int *nego_srv_version); |
1639 | |
1640 | void hv_process_channel_removal(struct vmbus_channel *channel); |
1641 | |
1642 | void vmbus_setevent(struct vmbus_channel *channel); |
1643 | /* |
1644 | * Negotiated version with the Host. |
1645 | */ |
1646 | |
1647 | extern __u32 vmbus_proto_version; |
1648 | |
1649 | int vmbus_send_tl_connect_request(const guid_t *shv_guest_servie_id, |
1650 | const guid_t *shv_host_servie_id); |
1651 | int vmbus_send_modifychannel(struct vmbus_channel *channel, u32 target_vp); |
1652 | void vmbus_set_event(struct vmbus_channel *channel); |
1653 | |
1654 | /* Get the start of the ring buffer. */ |
1655 | static inline void * |
1656 | hv_get_ring_buffer(const struct hv_ring_buffer_info *ring_info) |
1657 | { |
1658 | return ring_info->ring_buffer->buffer; |
1659 | } |
1660 | |
1661 | /* |
1662 | * Mask off host interrupt callback notifications |
1663 | */ |
1664 | static inline void hv_begin_read(struct hv_ring_buffer_info *rbi) |
1665 | { |
1666 | rbi->ring_buffer->interrupt_mask = 1; |
1667 | |
1668 | /* make sure mask update is not reordered */ |
1669 | virt_mb(); |
1670 | } |
1671 | |
1672 | /* |
1673 | * Re-enable host callback and return number of outstanding bytes |
1674 | */ |
1675 | static inline u32 hv_end_read(struct hv_ring_buffer_info *rbi) |
1676 | { |
1677 | |
1678 | rbi->ring_buffer->interrupt_mask = 0; |
1679 | |
1680 | /* make sure mask update is not reordered */ |
1681 | virt_mb(); |
1682 | |
1683 | /* |
1684 | * Now check to see if the ring buffer is still empty. |
1685 | * If it is not, we raced and we need to process new |
1686 | * incoming messages. |
1687 | */ |
1688 | return hv_get_bytes_to_read(rbi); |
1689 | } |
1690 | |
1691 | /* |
1692 | * An API to support in-place processing of incoming VMBUS packets. |
1693 | */ |
1694 | |
1695 | /* Get data payload associated with descriptor */ |
1696 | static inline void *hv_pkt_data(const struct vmpacket_descriptor *desc) |
1697 | { |
1698 | return (void *)((unsigned long)desc + (desc->offset8 << 3)); |
1699 | } |
1700 | |
1701 | /* Get data size associated with descriptor */ |
1702 | static inline u32 hv_pkt_datalen(const struct vmpacket_descriptor *desc) |
1703 | { |
1704 | return (desc->len8 << 3) - (desc->offset8 << 3); |
1705 | } |
1706 | |
1707 | /* Get packet length associated with descriptor */ |
1708 | static inline u32 hv_pkt_len(const struct vmpacket_descriptor *desc) |
1709 | { |
1710 | return desc->len8 << 3; |
1711 | } |
1712 | |
1713 | struct vmpacket_descriptor * |
1714 | hv_pkt_iter_first(struct vmbus_channel *channel); |
1715 | |
1716 | struct vmpacket_descriptor * |
1717 | __hv_pkt_iter_next(struct vmbus_channel *channel, |
1718 | const struct vmpacket_descriptor *pkt); |
1719 | |
1720 | void hv_pkt_iter_close(struct vmbus_channel *channel); |
1721 | |
1722 | static inline struct vmpacket_descriptor * |
1723 | hv_pkt_iter_next(struct vmbus_channel *channel, |
1724 | const struct vmpacket_descriptor *pkt) |
1725 | { |
1726 | struct vmpacket_descriptor *nxt; |
1727 | |
1728 | nxt = __hv_pkt_iter_next(channel, pkt); |
1729 | if (!nxt) |
1730 | hv_pkt_iter_close(channel); |
1731 | |
1732 | return nxt; |
1733 | } |
1734 | |
1735 | #define foreach_vmbus_pkt(pkt, channel) \ |
1736 | for (pkt = hv_pkt_iter_first(channel); pkt; \ |
1737 | pkt = hv_pkt_iter_next(channel, pkt)) |
1738 | |
1739 | /* |
1740 | * Interface for passing data between SR-IOV PF and VF drivers. The VF driver |
1741 | * sends requests to read and write blocks. Each block must be 128 bytes or |
1742 | * smaller. Optionally, the VF driver can register a callback function which |
1743 | * will be invoked when the host says that one or more of the first 64 block |
1744 | * IDs is "invalid" which means that the VF driver should reread them. |
1745 | */ |
1746 | #define HV_CONFIG_BLOCK_SIZE_MAX 128 |
1747 | |
1748 | int hyperv_read_cfg_blk(struct pci_dev *dev, void *buf, unsigned int buf_len, |
1749 | unsigned int block_id, unsigned int *bytes_returned); |
1750 | int hyperv_write_cfg_blk(struct pci_dev *dev, void *buf, unsigned int len, |
1751 | unsigned int block_id); |
1752 | int hyperv_reg_block_invalidate(struct pci_dev *dev, void *context, |
1753 | void (*block_invalidate)(void *context, |
1754 | u64 block_mask)); |
1755 | |
1756 | struct hyperv_pci_block_ops { |
1757 | int (*read_block)(struct pci_dev *dev, void *buf, unsigned int buf_len, |
1758 | unsigned int block_id, unsigned int *bytes_returned); |
1759 | int (*write_block)(struct pci_dev *dev, void *buf, unsigned int len, |
1760 | unsigned int block_id); |
1761 | int (*reg_blk_invalidate)(struct pci_dev *dev, void *context, |
1762 | void (*block_invalidate)(void *context, |
1763 | u64 block_mask)); |
1764 | }; |
1765 | |
1766 | extern struct hyperv_pci_block_ops hvpci_block_ops; |
1767 | |
1768 | static inline unsigned long virt_to_hvpfn(void *addr) |
1769 | { |
1770 | phys_addr_t paddr; |
1771 | |
1772 | if (is_vmalloc_addr(x: addr)) |
1773 | paddr = page_to_phys(vmalloc_to_page(addr)) + |
1774 | offset_in_page(addr); |
1775 | else |
1776 | paddr = __pa(addr); |
1777 | |
1778 | return paddr >> HV_HYP_PAGE_SHIFT; |
1779 | } |
1780 | |
1781 | #define NR_HV_HYP_PAGES_IN_PAGE (PAGE_SIZE / HV_HYP_PAGE_SIZE) |
1782 | #define offset_in_hvpage(ptr) ((unsigned long)(ptr) & ~HV_HYP_PAGE_MASK) |
1783 | #define HVPFN_UP(x) (((x) + HV_HYP_PAGE_SIZE-1) >> HV_HYP_PAGE_SHIFT) |
1784 | #define HVPFN_DOWN(x) ((x) >> HV_HYP_PAGE_SHIFT) |
1785 | #define page_to_hvpfn(page) (page_to_pfn(page) * NR_HV_HYP_PAGES_IN_PAGE) |
1786 | |
1787 | #endif /* _HYPERV_H */ |
1788 | |