1 /* SPDX-License-Identifier: GPL-2.0-only */
4 * Copyright (c) 2011, Microsoft Corporation.
7 * Haiyang Zhang <haiyangz@microsoft.com>
8 * Hank Janssen <hjanssen@microsoft.com>
9 * K. Y. Srinivasan <kys@microsoft.com>
15 #include <uapi/linux/hyperv.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>
29 #define MAX_PAGE_BUFFER_COUNT 32
30 #define MAX_MULTIPAGE_BUFFER_COUNT 32 /* 128K */
35 * Types for GPADL, decides is how GPADL header is created.
37 * It doesn't make much difference between BUFFER and RING if PAGE_SIZE is the
38 * same as HV_HYP_PAGE_SIZE.
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:
48 * gva: |-- 64k --|-- 64k --| ... |
49 * gpa: | 4k | 4k | ... | 4k | 4k | 4k | ... | 4k |
50 * index: 0 1 2 15 16 17 18 .. 31 32 ...
51 * | | ... | | | ... | ...
53 * gpadl: | 4k | 4k | ... | 4k | 4k | 4k | ... | 4k | ... |
54 * index: 0 1 2 ... 15 16 17 18 .. 31 32 ...
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
64 * | / / ... / ... | / ... /
68 * gpadl: | 4k | 4k | ... | ... | 4k | 4k | ... |
69 * index: 0 1 2 ... 16 ... n-15 n-14 n-13 ... 2n-30
76 /* Single-page buffer */
77 struct hv_page_buffer {
83 /* Multiple-page buffer */
84 struct hv_multipage_buffer {
85 /* Length and Offset determines the # of pfns in the array */
88 u64 pfn_array[MAX_MULTIPAGE_BUFFER_COUNT];
92 * Multiple-page buffer array; the pfn array is variable size:
93 * The number of entries in the PFN array is determined by
97 /* Length and Offset determines the # of pfns in the array */
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))
113 struct hv_ring_buffer {
114 /* Offset in bytes from the start of ring data below */
117 /* Offset in bytes from the start of ring data below */
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.
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
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
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.
152 u32 feat_pending_send_sz:1;
157 /* Pad it to PAGE_SIZE so that data starts on page boundary */
158 u8 reserved2[PAGE_SIZE - 68];
161 * Ring data starts here + RingDataStartOffset
162 * !!! DO NOT place any fields below this !!!
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) + \
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;
177 u32 ring_datasize; /* < ring_size */
180 * The ring buffer mutex lock. This lock prevents the ring buffer from
181 * being freed while the ring buffer is being accessed.
183 struct mutex ring_buffer_mutex;
185 /* Buffer that holds a copy of an incoming host packet */
191 static inline u32 hv_get_bytes_to_read(const struct hv_ring_buffer_info *rbi)
193 u32 read_loc, write_loc, dsize, read;
195 dsize = rbi->ring_datasize;
196 read_loc = rbi->ring_buffer->read_index;
197 write_loc = READ_ONCE(rbi->ring_buffer->write_index);
199 read = write_loc >= read_loc ? (write_loc - read_loc) :
200 (dsize - read_loc) + write_loc;
205 static inline u32 hv_get_bytes_to_write(const struct hv_ring_buffer_info *rbi)
207 u32 read_loc, write_loc, dsize, write;
209 dsize = rbi->ring_datasize;
210 read_loc = READ_ONCE(rbi->ring_buffer->read_index);
211 write_loc = rbi->ring_buffer->write_index;
213 write = write_loc >= read_loc ? dsize - (write_loc - read_loc) :
214 read_loc - write_loc;
218 static inline u32 hv_get_avail_to_write_percent(
219 const struct hv_ring_buffer_info *rbi)
221 u32 avail_write = hv_get_bytes_to_write(rbi);
223 return reciprocal_divide(
224 (avail_write << 3) + (avail_write << 1),
225 rbi->ring_size_div10_reciprocal);
229 * VMBUS version is 32 bit entity broken up into
230 * two 16 bit quantities: major_number. minor_number.
232 * 0 . 13 (Windows Server 2008)
235 * 3 . 0 (Windows 8 R2)
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)
244 #define VERSION_WS2008 ((0 << 16) | (13))
245 #define VERSION_WIN7 ((1 << 16) | (1))
246 #define VERSION_WIN8 ((2 << 16) | (4))
247 #define VERSION_WIN8_1 ((3 << 16) | (0))
248 #define VERSION_WIN10 ((4 << 16) | (0))
249 #define VERSION_WIN10_V4_1 ((4 << 16) | (1))
250 #define VERSION_WIN10_V5 ((5 << 16) | (0))
251 #define VERSION_WIN10_V5_1 ((5 << 16) | (1))
252 #define VERSION_WIN10_V5_2 ((5 << 16) | (2))
253 #define VERSION_WIN10_V5_3 ((5 << 16) | (3))
255 /* Make maximum size of pipe payload of 16K */
256 #define MAX_PIPE_DATA_PAYLOAD (sizeof(u8) * 16384)
258 /* Define PipeMode values. */
259 #define VMBUS_PIPE_TYPE_BYTE 0x00000000
260 #define VMBUS_PIPE_TYPE_MESSAGE 0x00000004
262 /* The size of the user defined data buffer for non-pipe offers. */
263 #define MAX_USER_DEFINED_BYTES 120
265 /* The size of the user defined data buffer for pipe offers. */
266 #define MAX_PIPE_USER_DEFINED_BYTES 116
269 * At the center of the Channel Management library is the Channel Offer. This
270 * struct contains the fundamental information about an offer.
272 struct vmbus_channel_offer {
277 * These two fields are not currently used.
283 u16 mmio_megabytes; /* in bytes * 1024 * 1024 */
286 /* Non-pipes: The user has MAX_USER_DEFINED_BYTES bytes. */
288 unsigned char user_def[MAX_USER_DEFINED_BYTES];
293 * The following structure is an integrated pipe protocol, which
294 * is implemented on top of standard user-defined data. Pipe
295 * clients have MAX_PIPE_USER_DEFINED_BYTES left for their own
300 unsigned char user_def[MAX_PIPE_USER_DEFINED_BYTES];
304 * The sub_channel_index is defined in Win8: a value of zero means a
305 * primary channel and a value of non-zero means a sub-channel.
307 * Before Win8, the field is reserved, meaning it's always zero.
309 u16 sub_channel_index;
314 #define VMBUS_CHANNEL_ENUMERATE_DEVICE_INTERFACE 1
315 #define VMBUS_CHANNEL_SERVER_SUPPORTS_TRANSFER_PAGES 2
316 #define VMBUS_CHANNEL_SERVER_SUPPORTS_GPADLS 4
317 #define VMBUS_CHANNEL_NAMED_PIPE_MODE 0x10
318 #define VMBUS_CHANNEL_LOOPBACK_OFFER 0x100
319 #define VMBUS_CHANNEL_PARENT_OFFER 0x200
320 #define VMBUS_CHANNEL_REQUEST_MONITORED_NOTIFICATION 0x400
321 #define VMBUS_CHANNEL_TLNPI_PROVIDER_OFFER 0x2000
323 struct vmpacket_descriptor {
331 struct vmpacket_header {
332 u32 prev_pkt_start_offset;
333 struct vmpacket_descriptor descriptor;
336 struct vmtransfer_page_range {
341 struct vmtransfer_page_packet_header {
342 struct vmpacket_descriptor d;
347 struct vmtransfer_page_range ranges[1];
350 struct vmgpadl_packet_header {
351 struct vmpacket_descriptor d;
356 struct vmadd_remove_transfer_page_set {
357 struct vmpacket_descriptor d;
364 * This structure defines a range in guest physical space that can be made to
365 * look virtually contiguous.
374 * This is the format for an Establish Gpadl packet, which contains a handle by
375 * which this GPADL will be known and a set of GPA ranges associated with it.
376 * This can be converted to a MDL by the guest OS. If there are multiple GPA
377 * ranges, then the resulting MDL will be "chained," representing multiple VA
380 struct vmestablish_gpadl {
381 struct vmpacket_descriptor d;
384 struct gpa_range range[1];
388 * This is the format for a Teardown Gpadl packet, which indicates that the
389 * GPADL handle in the Establish Gpadl packet will never be referenced again.
391 struct vmteardown_gpadl {
392 struct vmpacket_descriptor d;
394 u32 reserved; /* for alignment to a 8-byte boundary */
398 * This is the format for a GPA-Direct packet, which contains a set of GPA
399 * ranges, in addition to commands and/or data.
401 struct vmdata_gpa_direct {
402 struct vmpacket_descriptor d;
405 struct gpa_range range[1];
408 /* This is the format for a Additional Data Packet. */
409 struct vmadditional_data {
410 struct vmpacket_descriptor d;
414 unsigned char data[1];
417 union vmpacket_largest_possible_header {
418 struct vmpacket_descriptor simple_hdr;
419 struct vmtransfer_page_packet_header xfer_page_hdr;
420 struct vmgpadl_packet_header gpadl_hdr;
421 struct vmadd_remove_transfer_page_set add_rm_xfer_page_hdr;
422 struct vmestablish_gpadl establish_gpadl_hdr;
423 struct vmteardown_gpadl teardown_gpadl_hdr;
424 struct vmdata_gpa_direct data_gpa_direct_hdr;
427 #define VMPACKET_DATA_START_ADDRESS(__packet) \
428 (void *)(((unsigned char *)__packet) + \
429 ((struct vmpacket_descriptor)__packet)->offset8 * 8)
431 #define VMPACKET_DATA_LENGTH(__packet) \
432 ((((struct vmpacket_descriptor)__packet)->len8 - \
433 ((struct vmpacket_descriptor)__packet)->offset8) * 8)
435 #define VMPACKET_TRANSFER_MODE(__packet) \
436 (((struct IMPACT)__packet)->type)
438 enum vmbus_packet_type {
439 VM_PKT_INVALID = 0x0,
441 VM_PKT_ADD_XFER_PAGESET = 0x2,
442 VM_PKT_RM_XFER_PAGESET = 0x3,
443 VM_PKT_ESTABLISH_GPADL = 0x4,
444 VM_PKT_TEARDOWN_GPADL = 0x5,
445 VM_PKT_DATA_INBAND = 0x6,
446 VM_PKT_DATA_USING_XFER_PAGES = 0x7,
447 VM_PKT_DATA_USING_GPADL = 0x8,
448 VM_PKT_DATA_USING_GPA_DIRECT = 0x9,
449 VM_PKT_CANCEL_REQUEST = 0xa,
451 VM_PKT_DATA_USING_ADDITIONAL_PKT = 0xc,
452 VM_PKT_ADDITIONAL_DATA = 0xd
455 #define VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED 1
458 /* Version 1 messages */
459 enum vmbus_channel_message_type {
460 CHANNELMSG_INVALID = 0,
461 CHANNELMSG_OFFERCHANNEL = 1,
462 CHANNELMSG_RESCIND_CHANNELOFFER = 2,
463 CHANNELMSG_REQUESTOFFERS = 3,
464 CHANNELMSG_ALLOFFERS_DELIVERED = 4,
465 CHANNELMSG_OPENCHANNEL = 5,
466 CHANNELMSG_OPENCHANNEL_RESULT = 6,
467 CHANNELMSG_CLOSECHANNEL = 7,
468 CHANNELMSG_GPADL_HEADER = 8,
469 CHANNELMSG_GPADL_BODY = 9,
470 CHANNELMSG_GPADL_CREATED = 10,
471 CHANNELMSG_GPADL_TEARDOWN = 11,
472 CHANNELMSG_GPADL_TORNDOWN = 12,
473 CHANNELMSG_RELID_RELEASED = 13,
474 CHANNELMSG_INITIATE_CONTACT = 14,
475 CHANNELMSG_VERSION_RESPONSE = 15,
476 CHANNELMSG_UNLOAD = 16,
477 CHANNELMSG_UNLOAD_RESPONSE = 17,
481 CHANNELMSG_TL_CONNECT_REQUEST = 21,
482 CHANNELMSG_MODIFYCHANNEL = 22,
483 CHANNELMSG_TL_CONNECT_RESULT = 23,
484 CHANNELMSG_MODIFYCHANNEL_RESPONSE = 24,
488 /* Hyper-V supports about 2048 channels, and the RELIDs start with 1. */
489 #define INVALID_RELID U32_MAX
491 struct vmbus_channel_message_header {
492 enum vmbus_channel_message_type msgtype;
496 /* Query VMBus Version parameters */
497 struct vmbus_channel_query_vmbus_version {
498 struct vmbus_channel_message_header header;
502 /* VMBus Version Supported parameters */
503 struct vmbus_channel_version_supported {
504 struct vmbus_channel_message_header header;
505 u8 version_supported;
508 /* Offer Channel parameters */
509 struct vmbus_channel_offer_channel {
510 struct vmbus_channel_message_header header;
511 struct vmbus_channel_offer offer;
515 * win7 and beyond splits this field into a bit field.
517 u8 monitor_allocated:1;
520 * These are new fields added in win7 and later.
521 * Do not access these fields without checking the
522 * negotiated protocol.
524 * If "is_dedicated_interrupt" is set, we must not set the
525 * associated bit in the channel bitmap while sending the
526 * interrupt to the host.
528 * connection_id is to be used in signaling the host.
530 u16 is_dedicated_interrupt:1;
535 /* Rescind Offer parameters */
536 struct vmbus_channel_rescind_offer {
537 struct vmbus_channel_message_header header;
542 * Request Offer -- no parameters, SynIC message contains the partition ID
543 * Set Snoop -- no parameters, SynIC message contains the partition ID
544 * Clear Snoop -- no parameters, SynIC message contains the partition ID
545 * All Offers Delivered -- no parameters, SynIC message contains the partition
547 * Flush Client -- no parameters, SynIC message contains the partition ID
550 /* Open Channel parameters */
551 struct vmbus_channel_open_channel {
552 struct vmbus_channel_message_header header;
554 /* Identifies the specific VMBus channel that is being opened. */
557 /* ID making a particular open request at a channel offer unique. */
560 /* GPADL for the channel's ring buffer. */
561 u32 ringbuffer_gpadlhandle;
564 * Starting with win8, this field will be used to specify
565 * the target virtual processor on which to deliver the interrupt for
566 * the host to guest communication.
567 * Prior to win8, incoming channel interrupts would only
568 * be delivered on cpu 0. Setting this value to 0 would
569 * preserve the earlier behavior.
574 * The upstream ring buffer begins at offset zero in the memory
575 * described by RingBufferGpadlHandle. The downstream ring buffer
576 * follows it at this offset (in pages).
578 u32 downstream_ringbuffer_pageoffset;
580 /* User-specific data to be passed along to the server endpoint. */
581 unsigned char userdata[MAX_USER_DEFINED_BYTES];
584 /* Open Channel Result parameters */
585 struct vmbus_channel_open_result {
586 struct vmbus_channel_message_header header;
592 /* Modify Channel Result parameters */
593 struct vmbus_channel_modifychannel_response {
594 struct vmbus_channel_message_header header;
599 /* Close channel parameters; */
600 struct vmbus_channel_close_channel {
601 struct vmbus_channel_message_header header;
605 /* Channel Message GPADL */
606 #define GPADL_TYPE_RING_BUFFER 1
607 #define GPADL_TYPE_SERVER_SAVE_AREA 2
608 #define GPADL_TYPE_TRANSACTION 8
611 * The number of PFNs in a GPADL message is defined by the number of
612 * pages that would be spanned by ByteCount and ByteOffset. If the
613 * implied number of PFNs won't fit in this packet, there will be a
614 * follow-up packet that contains more.
616 struct vmbus_channel_gpadl_header {
617 struct vmbus_channel_message_header header;
622 struct gpa_range range[];
625 /* This is the followup packet that contains more PFNs. */
626 struct vmbus_channel_gpadl_body {
627 struct vmbus_channel_message_header header;
633 struct vmbus_channel_gpadl_created {
634 struct vmbus_channel_message_header header;
640 struct vmbus_channel_gpadl_teardown {
641 struct vmbus_channel_message_header header;
646 struct vmbus_channel_gpadl_torndown {
647 struct vmbus_channel_message_header header;
651 struct vmbus_channel_relid_released {
652 struct vmbus_channel_message_header header;
656 struct vmbus_channel_initiate_contact {
657 struct vmbus_channel_message_header header;
658 u32 vmbus_version_requested;
659 u32 target_vcpu; /* The VCPU the host should respond to */
672 /* Hyper-V socket: guest's connect()-ing to host */
673 struct vmbus_channel_tl_connect_request {
674 struct vmbus_channel_message_header header;
675 guid_t guest_endpoint_id;
676 guid_t host_service_id;
679 /* Modify Channel parameters, cf. vmbus_send_modifychannel() */
680 struct vmbus_channel_modifychannel {
681 struct vmbus_channel_message_header header;
686 struct vmbus_channel_version_response {
687 struct vmbus_channel_message_header header;
688 u8 version_supported;
694 * On new hosts that support VMBus protocol 5.0, we must use
695 * VMBUS_MESSAGE_CONNECTION_ID_4 for the Initiate Contact Message,
696 * and for subsequent messages, we must use the Message Connection ID
697 * field in the host-returned Version Response Message.
699 * On old hosts, we should always use VMBUS_MESSAGE_CONNECTION_ID (1).
704 enum vmbus_channel_state {
706 CHANNEL_OPENING_STATE,
708 CHANNEL_OPENED_STATE,
712 * Represents each channel msg on the vmbus connection This is a
713 * variable-size data structure depending on the msg type itself
715 struct vmbus_channel_msginfo {
716 /* Bookkeeping stuff */
717 struct list_head msglistentry;
719 /* So far, this is only used to handle gpadl body message */
720 struct list_head submsglist;
722 /* Synchronize the request/response if needed */
723 struct completion waitevent;
724 struct vmbus_channel *waiting_channel;
726 struct vmbus_channel_version_supported version_supported;
727 struct vmbus_channel_open_result open_result;
728 struct vmbus_channel_gpadl_torndown gpadl_torndown;
729 struct vmbus_channel_gpadl_created gpadl_created;
730 struct vmbus_channel_version_response version_response;
731 struct vmbus_channel_modifychannel_response modify_response;
736 * The channel message that goes out on the "wire".
737 * It will contain at minimum the VMBUS_CHANNEL_MESSAGE_HEADER header
742 struct vmbus_close_msg {
743 struct vmbus_channel_msginfo info;
744 struct vmbus_channel_close_channel msg;
747 /* Define connection identifier type. */
748 union hv_connection_id {
756 enum vmbus_device_type {
777 * Provides request ids for VMBus. Encapsulates guest memory
778 * addresses and stores the next available slot in req_arr
779 * to generate new ids in constant time.
781 struct vmbus_requestor {
783 unsigned long *req_bitmap; /* is a given slot available? */
786 spinlock_t req_lock; /* provides atomicity */
789 #define VMBUS_NO_RQSTOR U64_MAX
790 #define VMBUS_RQST_ERROR (U64_MAX - 1)
791 #define VMBUS_RQST_ADDR_ANY U64_MAX
792 /* NetVSC-specific */
793 #define VMBUS_RQST_ID_NO_RESPONSE (U64_MAX - 2)
794 /* StorVSC-specific */
795 #define VMBUS_RQST_INIT (U64_MAX - 2)
796 #define VMBUS_RQST_RESET (U64_MAX - 3)
798 struct vmbus_device {
802 bool allowed_in_isolated;
805 #define VMBUS_DEFAULT_MAX_PKT_SIZE 4096
813 struct vmbus_channel {
814 struct list_head listentry;
816 struct hv_device *device_obj;
818 enum vmbus_channel_state state;
820 struct vmbus_channel_offer_channel offermsg;
822 * These are based on the OfferMsg.MonitorId.
823 * Save it here for easy access.
828 bool rescind; /* got rescind msg */
829 bool rescind_ref; /* got rescind msg, got channel reference */
830 struct completion rescind_event;
832 struct vmbus_gpadl ringbuffer_gpadlhandle;
834 /* Allocated memory for ring buffer */
835 struct page *ringbuffer_page;
836 u32 ringbuffer_pagecount;
837 u32 ringbuffer_send_offset;
838 struct hv_ring_buffer_info outbound; /* send to parent */
839 struct hv_ring_buffer_info inbound; /* receive from parent */
841 struct vmbus_close_msg close_msg;
844 u64 interrupts; /* Host to Guest interrupts */
845 u64 sig_events; /* Guest to Host events */
848 * Guest to host interrupts caused by the outbound ring buffer changing
849 * from empty to not empty.
854 * Indicates that a full outbound ring buffer was encountered. The flag
855 * is set to true when a full outbound ring buffer is encountered and
856 * set to false when a write to the outbound ring buffer is completed.
860 /* Channel callback's invoked in softirq context */
861 struct tasklet_struct callback_event;
862 void (*onchannel_callback)(void *context);
863 void *channel_callback_context;
865 void (*change_target_cpu_callback)(struct vmbus_channel *channel,
869 * Synchronize channel scheduling and channel removal; see the inline
870 * comments in vmbus_chan_sched() and vmbus_reset_channel_cb().
872 spinlock_t sched_lock;
875 * A channel can be marked for one of three modes of reading:
876 * BATCHED - callback called from taslket and should read
877 * channel until empty. Interrupts from the host
878 * are masked while read is in process (default).
879 * DIRECT - callback called from tasklet (softirq).
880 * ISR - callback called in interrupt context and must
881 * invoke its own deferred processing.
882 * Host interrupts are disabled and must be re-enabled
883 * when ring is empty.
885 enum hv_callback_mode {
891 bool is_dedicated_interrupt;
895 * Starting with win8, this field will be used to specify the
896 * target CPU on which to deliver the interrupt for the host
897 * to guest communication.
899 * Prior to win8, incoming channel interrupts would only be
900 * delivered on CPU 0. Setting this value to 0 would preserve
901 * the earlier behavior.
905 * Support for sub-channels. For high performance devices,
906 * it will be useful to have multiple sub-channels to support
907 * a scalable communication infrastructure with the host.
908 * The support for sub-channels is implemented as an extension
909 * to the current infrastructure.
910 * The initial offer is considered the primary channel and this
911 * offer message will indicate if the host supports sub-channels.
912 * The guest is free to ask for sub-channels to be offered and can
913 * open these sub-channels as a normal "primary" channel. However,
914 * all sub-channels will have the same type and instance guids as the
915 * primary channel. Requests sent on a given channel will result in a
916 * response on the same channel.
920 * Sub-channel creation callback. This callback will be called in
921 * process context when a sub-channel offer is received from the host.
922 * The guest can open the sub-channel in the context of this callback.
924 void (*sc_creation_callback)(struct vmbus_channel *new_sc);
927 * Channel rescind callback. Some channels (the hvsock ones), need to
928 * register a callback which is invoked in vmbus_onoffer_rescind().
930 void (*chn_rescind_callback)(struct vmbus_channel *channel);
933 * All Sub-channels of a primary channel are linked here.
935 struct list_head sc_list;
937 * The primary channel this sub-channel belongs to.
938 * This will be NULL for the primary channel.
940 struct vmbus_channel *primary_channel;
942 * Support per-channel state for use by vmbus drivers.
944 void *per_channel_state;
947 * Defer freeing channel until after all cpu's have
948 * gone through grace period.
953 * For sysfs per-channel properties.
958 * For performance critical channels (storage, networking
959 * etc,), Hyper-V has a mechanism to enhance the throughput
960 * at the expense of latency:
961 * When the host is to be signaled, we just set a bit in a shared page
962 * and this bit will be inspected by the hypervisor within a certain
963 * window and if the bit is set, the host will be signaled. The window
964 * of time is the monitor latency - currently around 100 usecs. This
965 * mechanism improves throughput by:
967 * A) Making the host more efficient - each time it wakes up,
968 * potentially it will process morev number of packets. The
969 * monitor latency allows a batch to build up.
970 * B) By deferring the hypercall to signal, we will also minimize
973 * Clearly, these optimizations improve throughput at the expense of
974 * latency. Furthermore, since the channel is shared for both
975 * control and data messages, control messages currently suffer
976 * unnecessary latency adversely impacting performance and boot
977 * time. To fix this issue, permit tagging the channel as being
978 * in "low latency" mode. In this mode, we will bypass the monitor
986 * Cache the device ID here for easy access; this is useful, in
987 * particular, in situations where the channel's device_obj has
988 * not been allocated/initialized yet.
993 * We must offload the handling of the primary/sub channels
994 * from the single-threaded vmbus_connection.work_queue to
995 * two different workqueue, otherwise we can block
996 * vmbus_connection.work_queue and hang: see vmbus_process_offer().
998 struct work_struct add_channel_work;
1001 * Guest to host interrupts caused by the inbound ring buffer changing
1002 * from full to not full while a packet is waiting.
1007 * The total number of write operations that encountered a full
1008 * outbound ring buffer.
1013 * The number of write operations that were the first to encounter a
1014 * full outbound ring buffer.
1018 /* enabling/disabling fuzz testing on the channel (default is false)*/
1019 bool fuzz_testing_state;
1022 * Interrupt delay will delay the guest from emptying the ring buffer
1023 * for a specific amount of time. The delay is in microseconds and will
1024 * be between 1 to a maximum of 1000, its default is 0 (no delay).
1025 * The Message delay will delay guest reading on a per message basis
1026 * in microseconds between 1 to 1000 with the default being 0
1029 u32 fuzz_testing_interrupt_delay;
1030 u32 fuzz_testing_message_delay;
1032 /* callback to generate a request ID from a request address */
1033 u64 (*next_request_id_callback)(struct vmbus_channel *channel, u64 rqst_addr);
1034 /* callback to retrieve a request address from a request ID */
1035 u64 (*request_addr_callback)(struct vmbus_channel *channel, u64 rqst_id);
1037 /* request/transaction ids for VMBus */
1038 struct vmbus_requestor requestor;
1041 /* The max size of a packet on this channel */
1045 #define lock_requestor(channel, flags) \
1047 struct vmbus_requestor *rqstor = &(channel)->requestor; \
1049 spin_lock_irqsave(&rqstor->req_lock, flags); \
1052 static __always_inline void unlock_requestor(struct vmbus_channel *channel,
1053 unsigned long flags)
1055 struct vmbus_requestor *rqstor = &channel->requestor;
1057 spin_unlock_irqrestore(&rqstor->req_lock, flags);
1060 u64 vmbus_next_request_id(struct vmbus_channel *channel, u64 rqst_addr);
1061 u64 __vmbus_request_addr_match(struct vmbus_channel *channel, u64 trans_id,
1063 u64 vmbus_request_addr_match(struct vmbus_channel *channel, u64 trans_id,
1065 u64 vmbus_request_addr(struct vmbus_channel *channel, u64 trans_id);
1067 static inline bool is_hvsock_offer(const struct vmbus_channel_offer_channel *o)
1069 return !!(o->offer.chn_flags & VMBUS_CHANNEL_TLNPI_PROVIDER_OFFER);
1072 static inline bool is_hvsock_channel(const struct vmbus_channel *c)
1074 return is_hvsock_offer(&c->offermsg);
1077 static inline bool is_sub_channel(const struct vmbus_channel *c)
1079 return c->offermsg.offer.sub_channel_index != 0;
1082 static inline void set_channel_read_mode(struct vmbus_channel *c,
1083 enum hv_callback_mode mode)
1085 c->callback_mode = mode;
1088 static inline void set_per_channel_state(struct vmbus_channel *c, void *s)
1090 c->per_channel_state = s;
1093 static inline void *get_per_channel_state(struct vmbus_channel *c)
1095 return c->per_channel_state;
1098 static inline void set_channel_pending_send_size(struct vmbus_channel *c,
1101 unsigned long flags;
1104 spin_lock_irqsave(&c->outbound.ring_lock, flags);
1105 ++c->out_full_total;
1107 if (!c->out_full_flag) {
1108 ++c->out_full_first;
1109 c->out_full_flag = true;
1111 spin_unlock_irqrestore(&c->outbound.ring_lock, flags);
1113 c->out_full_flag = false;
1116 c->outbound.ring_buffer->pending_send_sz = size;
1119 void vmbus_onmessage(struct vmbus_channel_message_header *hdr);
1121 int vmbus_request_offers(void);
1124 * APIs for managing sub-channels.
1127 void vmbus_set_sc_create_callback(struct vmbus_channel *primary_channel,
1128 void (*sc_cr_cb)(struct vmbus_channel *new_sc));
1130 void vmbus_set_chn_rescind_callback(struct vmbus_channel *channel,
1131 void (*chn_rescind_cb)(struct vmbus_channel *));
1133 /* The format must be the same as struct vmdata_gpa_direct */
1134 struct vmbus_channel_packet_page_buffer {
1142 struct hv_page_buffer range[MAX_PAGE_BUFFER_COUNT];
1145 /* The format must be the same as struct vmdata_gpa_direct */
1146 struct vmbus_channel_packet_multipage_buffer {
1153 u32 rangecount; /* Always 1 in this case */
1154 struct hv_multipage_buffer range;
1157 /* The format must be the same as struct vmdata_gpa_direct */
1158 struct vmbus_packet_mpb_array {
1165 u32 rangecount; /* Always 1 in this case */
1166 struct hv_mpb_array range;
1169 int vmbus_alloc_ring(struct vmbus_channel *channel,
1170 u32 send_size, u32 recv_size);
1171 void vmbus_free_ring(struct vmbus_channel *channel);
1173 int vmbus_connect_ring(struct vmbus_channel *channel,
1174 void (*onchannel_callback)(void *context),
1176 int vmbus_disconnect_ring(struct vmbus_channel *channel);
1178 extern int vmbus_open(struct vmbus_channel *channel,
1179 u32 send_ringbuffersize,
1180 u32 recv_ringbuffersize,
1183 void (*onchannel_callback)(void *context),
1186 extern void vmbus_close(struct vmbus_channel *channel);
1188 extern int vmbus_sendpacket_getid(struct vmbus_channel *channel,
1193 enum vmbus_packet_type type,
1195 extern int vmbus_sendpacket(struct vmbus_channel *channel,
1199 enum vmbus_packet_type type,
1202 extern int vmbus_sendpacket_pagebuffer(struct vmbus_channel *channel,
1203 struct hv_page_buffer pagebuffers[],
1209 extern int vmbus_sendpacket_mpb_desc(struct vmbus_channel *channel,
1210 struct vmbus_packet_mpb_array *mpb,
1216 extern int vmbus_establish_gpadl(struct vmbus_channel *channel,
1219 struct vmbus_gpadl *gpadl);
1221 extern int vmbus_teardown_gpadl(struct vmbus_channel *channel,
1222 struct vmbus_gpadl *gpadl);
1224 void vmbus_reset_channel_cb(struct vmbus_channel *channel);
1226 extern int vmbus_recvpacket(struct vmbus_channel *channel,
1229 u32 *buffer_actual_len,
1232 extern int vmbus_recvpacket_raw(struct vmbus_channel *channel,
1235 u32 *buffer_actual_len,
1239 extern void vmbus_ontimer(unsigned long data);
1241 /* Base driver object */
1246 * A hvsock offer, which has a VMBUS_CHANNEL_TLNPI_PROVIDER_OFFER
1247 * channel flag, actually doesn't mean a synthetic device because the
1248 * offer's if_type/if_instance can change for every new hvsock
1251 * However, to facilitate the notification of new-offer/rescind-offer
1252 * from vmbus driver to hvsock driver, we can handle hvsock offer as
1253 * a special vmbus device, and hence we need the below flag to
1254 * indicate if the driver is the hvsock driver or not: we need to
1255 * specially treat the hvosck offer & driver in vmbus_match().
1259 /* the device type supported by this driver */
1261 const struct hv_vmbus_device_id *id_table;
1263 struct device_driver driver;
1265 /* dynamic device GUID's */
1268 struct list_head list;
1271 int (*probe)(struct hv_device *, const struct hv_vmbus_device_id *);
1272 int (*remove)(struct hv_device *);
1273 void (*shutdown)(struct hv_device *);
1275 int (*suspend)(struct hv_device *);
1276 int (*resume)(struct hv_device *);
1280 /* Base device object */
1282 /* the device type id of this device */
1285 /* the device instance id of this device */
1286 guid_t dev_instance;
1290 struct device device;
1291 char *driver_override; /* Driver name to force a match */
1293 struct vmbus_channel *channel;
1294 struct kset *channels_kset;
1295 struct device_dma_parameters dma_parms;
1298 /* place holder to keep track of the dir for hv device in debugfs */
1299 struct dentry *debug_dir;
1304 static inline struct hv_device *device_to_hv_device(struct device *d)
1306 return container_of(d, struct hv_device, device);
1309 static inline struct hv_driver *drv_to_hv_drv(struct device_driver *d)
1311 return container_of(d, struct hv_driver, driver);
1314 static inline void hv_set_drvdata(struct hv_device *dev, void *data)
1316 dev_set_drvdata(&dev->device, data);
1319 static inline void *hv_get_drvdata(struct hv_device *dev)
1321 return dev_get_drvdata(&dev->device);
1324 struct hv_ring_buffer_debug_info {
1325 u32 current_interrupt_mask;
1326 u32 current_read_index;
1327 u32 current_write_index;
1328 u32 bytes_avail_toread;
1329 u32 bytes_avail_towrite;
1333 int hv_ringbuffer_get_debuginfo(struct hv_ring_buffer_info *ring_info,
1334 struct hv_ring_buffer_debug_info *debug_info);
1336 /* Vmbus interface */
1337 #define vmbus_driver_register(driver) \
1338 __vmbus_driver_register(driver, THIS_MODULE, KBUILD_MODNAME)
1339 int __must_check __vmbus_driver_register(struct hv_driver *hv_driver,
1340 struct module *owner,
1341 const char *mod_name);
1342 void vmbus_driver_unregister(struct hv_driver *hv_driver);
1344 void vmbus_hvsock_device_unregister(struct vmbus_channel *channel);
1346 int vmbus_allocate_mmio(struct resource **new, struct hv_device *device_obj,
1347 resource_size_t min, resource_size_t max,
1348 resource_size_t size, resource_size_t align,
1349 bool fb_overlap_ok);
1350 void vmbus_free_mmio(resource_size_t start, resource_size_t size);
1353 * GUID definitions of various offer types - services offered to the guest.
1358 * {f8615163-df3e-46c5-913f-f2d2f965ed0e}
1360 #define HV_NIC_GUID \
1361 .guid = GUID_INIT(0xf8615163, 0xdf3e, 0x46c5, 0x91, 0x3f, \
1362 0xf2, 0xd2, 0xf9, 0x65, 0xed, 0x0e)
1366 * {32412632-86cb-44a2-9b5c-50d1417354f5}
1368 #define HV_IDE_GUID \
1369 .guid = GUID_INIT(0x32412632, 0x86cb, 0x44a2, 0x9b, 0x5c, \
1370 0x50, 0xd1, 0x41, 0x73, 0x54, 0xf5)
1374 * {ba6163d9-04a1-4d29-b605-72e2ffb1dc7f}
1376 #define HV_SCSI_GUID \
1377 .guid = GUID_INIT(0xba6163d9, 0x04a1, 0x4d29, 0xb6, 0x05, \
1378 0x72, 0xe2, 0xff, 0xb1, 0xdc, 0x7f)
1382 * {0e0b6031-5213-4934-818b-38d90ced39db}
1384 #define HV_SHUTDOWN_GUID \
1385 .guid = GUID_INIT(0x0e0b6031, 0x5213, 0x4934, 0x81, 0x8b, \
1386 0x38, 0xd9, 0x0c, 0xed, 0x39, 0xdb)
1390 * {9527E630-D0AE-497b-ADCE-E80AB0175CAF}
1392 #define HV_TS_GUID \
1393 .guid = GUID_INIT(0x9527e630, 0xd0ae, 0x497b, 0xad, 0xce, \
1394 0xe8, 0x0a, 0xb0, 0x17, 0x5c, 0xaf)
1398 * {57164f39-9115-4e78-ab55-382f3bd5422d}
1400 #define HV_HEART_BEAT_GUID \
1401 .guid = GUID_INIT(0x57164f39, 0x9115, 0x4e78, 0xab, 0x55, \
1402 0x38, 0x2f, 0x3b, 0xd5, 0x42, 0x2d)
1406 * {a9a0f4e7-5a45-4d96-b827-8a841e8c03e6}
1408 #define HV_KVP_GUID \
1409 .guid = GUID_INIT(0xa9a0f4e7, 0x5a45, 0x4d96, 0xb8, 0x27, \
1410 0x8a, 0x84, 0x1e, 0x8c, 0x03, 0xe6)
1413 * Dynamic memory GUID
1414 * {525074dc-8985-46e2-8057-a307dc18a502}
1416 #define HV_DM_GUID \
1417 .guid = GUID_INIT(0x525074dc, 0x8985, 0x46e2, 0x80, 0x57, \
1418 0xa3, 0x07, 0xdc, 0x18, 0xa5, 0x02)
1422 * {cfa8b69e-5b4a-4cc0-b98b-8ba1a1f3f95a}
1424 #define HV_MOUSE_GUID \
1425 .guid = GUID_INIT(0xcfa8b69e, 0x5b4a, 0x4cc0, 0xb9, 0x8b, \
1426 0x8b, 0xa1, 0xa1, 0xf3, 0xf9, 0x5a)
1430 * {f912ad6d-2b17-48ea-bd65-f927a61c7684}
1432 #define HV_KBD_GUID \
1433 .guid = GUID_INIT(0xf912ad6d, 0x2b17, 0x48ea, 0xbd, 0x65, \
1434 0xf9, 0x27, 0xa6, 0x1c, 0x76, 0x84)
1437 * VSS (Backup/Restore) GUID
1439 #define HV_VSS_GUID \
1440 .guid = GUID_INIT(0x35fa2e29, 0xea23, 0x4236, 0x96, 0xae, \
1441 0x3a, 0x6e, 0xba, 0xcb, 0xa4, 0x40)
1443 * Synthetic Video GUID
1444 * {DA0A7802-E377-4aac-8E77-0558EB1073F8}
1446 #define HV_SYNTHVID_GUID \
1447 .guid = GUID_INIT(0xda0a7802, 0xe377, 0x4aac, 0x8e, 0x77, \
1448 0x05, 0x58, 0xeb, 0x10, 0x73, 0xf8)
1452 * {2f9bcc4a-0069-4af3-b76b-6fd0be528cda}
1454 #define HV_SYNTHFC_GUID \
1455 .guid = GUID_INIT(0x2f9bcc4a, 0x0069, 0x4af3, 0xb7, 0x6b, \
1456 0x6f, 0xd0, 0xbe, 0x52, 0x8c, 0xda)
1459 * Guest File Copy Service
1460 * {34D14BE3-DEE4-41c8-9AE7-6B174977C192}
1463 #define HV_FCOPY_GUID \
1464 .guid = GUID_INIT(0x34d14be3, 0xdee4, 0x41c8, 0x9a, 0xe7, \
1465 0x6b, 0x17, 0x49, 0x77, 0xc1, 0x92)
1468 * NetworkDirect. This is the guest RDMA service.
1469 * {8c2eaf3d-32a7-4b09-ab99-bd1f1c86b501}
1471 #define HV_ND_GUID \
1472 .guid = GUID_INIT(0x8c2eaf3d, 0x32a7, 0x4b09, 0xab, 0x99, \
1473 0xbd, 0x1f, 0x1c, 0x86, 0xb5, 0x01)
1476 * PCI Express Pass Through
1477 * {44C4F61D-4444-4400-9D52-802E27EDE19F}
1480 #define HV_PCIE_GUID \
1481 .guid = GUID_INIT(0x44c4f61d, 0x4444, 0x4400, 0x9d, 0x52, \
1482 0x80, 0x2e, 0x27, 0xed, 0xe1, 0x9f)
1485 * Linux doesn't support these 4 devices: the first two are for
1486 * Automatic Virtual Machine Activation, the third is for
1487 * Remote Desktop Virtualization, and the fourth is Initial
1488 * Machine Configuration (IMC) used only by Windows guests.
1489 * {f8e65716-3cb3-4a06-9a60-1889c5cccab5}
1490 * {3375baf4-9e15-4b30-b765-67acb10d607b}
1491 * {276aacf4-ac15-426c-98dd-7521ad3f01fe}
1492 * {c376c1c3-d276-48d2-90a9-c04748072c60}
1495 #define HV_AVMA1_GUID \
1496 .guid = GUID_INIT(0xf8e65716, 0x3cb3, 0x4a06, 0x9a, 0x60, \
1497 0x18, 0x89, 0xc5, 0xcc, 0xca, 0xb5)
1499 #define HV_AVMA2_GUID \
1500 .guid = GUID_INIT(0x3375baf4, 0x9e15, 0x4b30, 0xb7, 0x65, \
1501 0x67, 0xac, 0xb1, 0x0d, 0x60, 0x7b)
1503 #define HV_RDV_GUID \
1504 .guid = GUID_INIT(0x276aacf4, 0xac15, 0x426c, 0x98, 0xdd, \
1505 0x75, 0x21, 0xad, 0x3f, 0x01, 0xfe)
1507 #define HV_IMC_GUID \
1508 .guid = GUID_INIT(0xc376c1c3, 0xd276, 0x48d2, 0x90, 0xa9, \
1509 0xc0, 0x47, 0x48, 0x07, 0x2c, 0x60)
1512 * Common header for Hyper-V ICs
1515 #define ICMSGTYPE_NEGOTIATE 0
1516 #define ICMSGTYPE_HEARTBEAT 1
1517 #define ICMSGTYPE_KVPEXCHANGE 2
1518 #define ICMSGTYPE_SHUTDOWN 3
1519 #define ICMSGTYPE_TIMESYNC 4
1520 #define ICMSGTYPE_VSS 5
1521 #define ICMSGTYPE_FCOPY 7
1523 #define ICMSGHDRFLAG_TRANSACTION 1
1524 #define ICMSGHDRFLAG_REQUEST 2
1525 #define ICMSGHDRFLAG_RESPONSE 4
1529 * While we want to handle util services as regular devices,
1530 * there is only one instance of each of these services; so
1531 * we statically allocate the service specific state.
1534 struct hv_util_service {
1537 void (*util_cb)(void *);
1538 int (*util_init)(struct hv_util_service *);
1539 void (*util_deinit)(void);
1540 int (*util_pre_suspend)(void);
1541 int (*util_pre_resume)(void);
1544 struct vmbuspipe_hdr {
1555 struct ic_version icverframe;
1557 struct ic_version icvermsg;
1560 u8 ictransaction_id;
1565 #define IC_VERSION_NEGOTIATION_MAX_VER_COUNT 100
1566 #define ICMSG_HDR (sizeof(struct vmbuspipe_hdr) + sizeof(struct icmsg_hdr))
1567 #define ICMSG_NEGOTIATE_PKT_SIZE(icframe_vercnt, icmsg_vercnt) \
1568 (ICMSG_HDR + sizeof(struct icmsg_negotiate) + \
1569 (((icframe_vercnt) + (icmsg_vercnt)) * sizeof(struct ic_version)))
1571 struct icmsg_negotiate {
1575 struct ic_version icversion_data[]; /* any size array */
1578 struct shutdown_msg_data {
1580 u32 timeout_seconds;
1582 u8 display_message[2048];
1585 struct heartbeat_msg_data {
1590 /* Time Sync IC defs */
1591 #define ICTIMESYNCFLAG_PROBE 0
1592 #define ICTIMESYNCFLAG_SYNC 1
1593 #define ICTIMESYNCFLAG_SAMPLE 2
1596 #define WLTIMEDELTA 116444736000000000L /* in 100ns unit */
1598 #define WLTIMEDELTA 116444736000000000LL
1601 struct ictimesync_data {
1608 struct ictimesync_ref_data {
1610 u64 vmreferencetime;
1617 struct hyperv_service_callback {
1621 struct vmbus_channel *channel;
1622 void (*callback)(void *context);
1625 struct hv_dma_range {
1630 #define MAX_SRV_VER 0x7ffffff
1631 extern bool vmbus_prep_negotiate_resp(struct icmsg_hdr *icmsghdrp, u8 *buf, u32 buflen,
1632 const int *fw_version, int fw_vercnt,
1633 const int *srv_version, int srv_vercnt,
1634 int *nego_fw_version, int *nego_srv_version);
1636 void hv_process_channel_removal(struct vmbus_channel *channel);
1638 void vmbus_setevent(struct vmbus_channel *channel);
1640 * Negotiated version with the Host.
1643 extern __u32 vmbus_proto_version;
1645 int vmbus_send_tl_connect_request(const guid_t *shv_guest_servie_id,
1646 const guid_t *shv_host_servie_id);
1647 int vmbus_send_modifychannel(struct vmbus_channel *channel, u32 target_vp);
1648 void vmbus_set_event(struct vmbus_channel *channel);
1650 /* Get the start of the ring buffer. */
1651 static inline void *
1652 hv_get_ring_buffer(const struct hv_ring_buffer_info *ring_info)
1654 return ring_info->ring_buffer->buffer;
1658 * Mask off host interrupt callback notifications
1660 static inline void hv_begin_read(struct hv_ring_buffer_info *rbi)
1662 rbi->ring_buffer->interrupt_mask = 1;
1664 /* make sure mask update is not reordered */
1669 * Re-enable host callback and return number of outstanding bytes
1671 static inline u32 hv_end_read(struct hv_ring_buffer_info *rbi)
1674 rbi->ring_buffer->interrupt_mask = 0;
1676 /* make sure mask update is not reordered */
1680 * Now check to see if the ring buffer is still empty.
1681 * If it is not, we raced and we need to process new
1682 * incoming messages.
1684 return hv_get_bytes_to_read(rbi);
1688 * An API to support in-place processing of incoming VMBUS packets.
1691 /* Get data payload associated with descriptor */
1692 static inline void *hv_pkt_data(const struct vmpacket_descriptor *desc)
1694 return (void *)((unsigned long)desc + (desc->offset8 << 3));
1697 /* Get data size associated with descriptor */
1698 static inline u32 hv_pkt_datalen(const struct vmpacket_descriptor *desc)
1700 return (desc->len8 << 3) - (desc->offset8 << 3);
1703 /* Get packet length associated with descriptor */
1704 static inline u32 hv_pkt_len(const struct vmpacket_descriptor *desc)
1706 return desc->len8 << 3;
1709 struct vmpacket_descriptor *
1710 hv_pkt_iter_first(struct vmbus_channel *channel);
1712 struct vmpacket_descriptor *
1713 __hv_pkt_iter_next(struct vmbus_channel *channel,
1714 const struct vmpacket_descriptor *pkt);
1716 void hv_pkt_iter_close(struct vmbus_channel *channel);
1718 static inline struct vmpacket_descriptor *
1719 hv_pkt_iter_next(struct vmbus_channel *channel,
1720 const struct vmpacket_descriptor *pkt)
1722 struct vmpacket_descriptor *nxt;
1724 nxt = __hv_pkt_iter_next(channel, pkt);
1726 hv_pkt_iter_close(channel);
1731 #define foreach_vmbus_pkt(pkt, channel) \
1732 for (pkt = hv_pkt_iter_first(channel); pkt; \
1733 pkt = hv_pkt_iter_next(channel, pkt))
1736 * Interface for passing data between SR-IOV PF and VF drivers. The VF driver
1737 * sends requests to read and write blocks. Each block must be 128 bytes or
1738 * smaller. Optionally, the VF driver can register a callback function which
1739 * will be invoked when the host says that one or more of the first 64 block
1740 * IDs is "invalid" which means that the VF driver should reread them.
1742 #define HV_CONFIG_BLOCK_SIZE_MAX 128
1744 int hyperv_read_cfg_blk(struct pci_dev *dev, void *buf, unsigned int buf_len,
1745 unsigned int block_id, unsigned int *bytes_returned);
1746 int hyperv_write_cfg_blk(struct pci_dev *dev, void *buf, unsigned int len,
1747 unsigned int block_id);
1748 int hyperv_reg_block_invalidate(struct pci_dev *dev, void *context,
1749 void (*block_invalidate)(void *context,
1752 struct hyperv_pci_block_ops {
1753 int (*read_block)(struct pci_dev *dev, void *buf, unsigned int buf_len,
1754 unsigned int block_id, unsigned int *bytes_returned);
1755 int (*write_block)(struct pci_dev *dev, void *buf, unsigned int len,
1756 unsigned int block_id);
1757 int (*reg_blk_invalidate)(struct pci_dev *dev, void *context,
1758 void (*block_invalidate)(void *context,
1762 extern struct hyperv_pci_block_ops hvpci_block_ops;
1764 static inline unsigned long virt_to_hvpfn(void *addr)
1768 if (is_vmalloc_addr(addr))
1769 paddr = page_to_phys(vmalloc_to_page(addr)) +
1770 offset_in_page(addr);
1774 return paddr >> HV_HYP_PAGE_SHIFT;
1777 #define NR_HV_HYP_PAGES_IN_PAGE (PAGE_SIZE / HV_HYP_PAGE_SIZE)
1778 #define offset_in_hvpage(ptr) ((unsigned long)(ptr) & ~HV_HYP_PAGE_MASK)
1779 #define HVPFN_UP(x) (((x) + HV_HYP_PAGE_SIZE-1) >> HV_HYP_PAGE_SHIFT)
1780 #define HVPFN_DOWN(x) ((x) >> HV_HYP_PAGE_SHIFT)
1781 #define page_to_hvpfn(page) (page_to_pfn(page) * NR_HV_HYP_PAGES_IN_PAGE)
1783 #endif /* _HYPERV_H */