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 hv_ringbuffer_pending_size(const struct hv_ring_buffer_info *rbi)
544 return rbi->ring_buffer->pending_send_sz;
548 * Request Offer -- no parameters, SynIC message contains the partition ID
549 * Set Snoop -- no parameters, SynIC message contains the partition ID
550 * Clear Snoop -- no parameters, SynIC message contains the partition ID
551 * All Offers Delivered -- no parameters, SynIC message contains the partition
553 * Flush Client -- no parameters, SynIC message contains the partition ID
556 /* Open Channel parameters */
557 struct vmbus_channel_open_channel {
558 struct vmbus_channel_message_header header;
560 /* Identifies the specific VMBus channel that is being opened. */
563 /* ID making a particular open request at a channel offer unique. */
566 /* GPADL for the channel's ring buffer. */
567 u32 ringbuffer_gpadlhandle;
570 * Starting with win8, this field will be used to specify
571 * the target virtual processor on which to deliver the interrupt for
572 * the host to guest communication.
573 * Prior to win8, incoming channel interrupts would only
574 * be delivered on cpu 0. Setting this value to 0 would
575 * preserve the earlier behavior.
580 * The upstream ring buffer begins at offset zero in the memory
581 * described by RingBufferGpadlHandle. The downstream ring buffer
582 * follows it at this offset (in pages).
584 u32 downstream_ringbuffer_pageoffset;
586 /* User-specific data to be passed along to the server endpoint. */
587 unsigned char userdata[MAX_USER_DEFINED_BYTES];
590 /* Open Channel Result parameters */
591 struct vmbus_channel_open_result {
592 struct vmbus_channel_message_header header;
598 /* Modify Channel Result parameters */
599 struct vmbus_channel_modifychannel_response {
600 struct vmbus_channel_message_header header;
605 /* Close channel parameters; */
606 struct vmbus_channel_close_channel {
607 struct vmbus_channel_message_header header;
611 /* Channel Message GPADL */
612 #define GPADL_TYPE_RING_BUFFER 1
613 #define GPADL_TYPE_SERVER_SAVE_AREA 2
614 #define GPADL_TYPE_TRANSACTION 8
617 * The number of PFNs in a GPADL message is defined by the number of
618 * pages that would be spanned by ByteCount and ByteOffset. If the
619 * implied number of PFNs won't fit in this packet, there will be a
620 * follow-up packet that contains more.
622 struct vmbus_channel_gpadl_header {
623 struct vmbus_channel_message_header header;
628 struct gpa_range range[];
631 /* This is the followup packet that contains more PFNs. */
632 struct vmbus_channel_gpadl_body {
633 struct vmbus_channel_message_header header;
639 struct vmbus_channel_gpadl_created {
640 struct vmbus_channel_message_header header;
646 struct vmbus_channel_gpadl_teardown {
647 struct vmbus_channel_message_header header;
652 struct vmbus_channel_gpadl_torndown {
653 struct vmbus_channel_message_header header;
657 struct vmbus_channel_relid_released {
658 struct vmbus_channel_message_header header;
662 struct vmbus_channel_initiate_contact {
663 struct vmbus_channel_message_header header;
664 u32 vmbus_version_requested;
665 u32 target_vcpu; /* The VCPU the host should respond to */
678 /* Hyper-V socket: guest's connect()-ing to host */
679 struct vmbus_channel_tl_connect_request {
680 struct vmbus_channel_message_header header;
681 guid_t guest_endpoint_id;
682 guid_t host_service_id;
685 /* Modify Channel parameters, cf. vmbus_send_modifychannel() */
686 struct vmbus_channel_modifychannel {
687 struct vmbus_channel_message_header header;
692 struct vmbus_channel_version_response {
693 struct vmbus_channel_message_header header;
694 u8 version_supported;
700 * On new hosts that support VMBus protocol 5.0, we must use
701 * VMBUS_MESSAGE_CONNECTION_ID_4 for the Initiate Contact Message,
702 * and for subsequent messages, we must use the Message Connection ID
703 * field in the host-returned Version Response Message.
705 * On old hosts, we should always use VMBUS_MESSAGE_CONNECTION_ID (1).
710 enum vmbus_channel_state {
712 CHANNEL_OPENING_STATE,
714 CHANNEL_OPENED_STATE,
718 * Represents each channel msg on the vmbus connection This is a
719 * variable-size data structure depending on the msg type itself
721 struct vmbus_channel_msginfo {
722 /* Bookkeeping stuff */
723 struct list_head msglistentry;
725 /* So far, this is only used to handle gpadl body message */
726 struct list_head submsglist;
728 /* Synchronize the request/response if needed */
729 struct completion waitevent;
730 struct vmbus_channel *waiting_channel;
732 struct vmbus_channel_version_supported version_supported;
733 struct vmbus_channel_open_result open_result;
734 struct vmbus_channel_gpadl_torndown gpadl_torndown;
735 struct vmbus_channel_gpadl_created gpadl_created;
736 struct vmbus_channel_version_response version_response;
737 struct vmbus_channel_modifychannel_response modify_response;
742 * The channel message that goes out on the "wire".
743 * It will contain at minimum the VMBUS_CHANNEL_MESSAGE_HEADER header
748 struct vmbus_close_msg {
749 struct vmbus_channel_msginfo info;
750 struct vmbus_channel_close_channel msg;
753 /* Define connection identifier type. */
754 union hv_connection_id {
762 enum vmbus_device_type {
783 * Provides request ids for VMBus. Encapsulates guest memory
784 * addresses and stores the next available slot in req_arr
785 * to generate new ids in constant time.
787 struct vmbus_requestor {
789 unsigned long *req_bitmap; /* is a given slot available? */
792 spinlock_t req_lock; /* provides atomicity */
795 #define VMBUS_NO_RQSTOR U64_MAX
796 #define VMBUS_RQST_ERROR (U64_MAX - 1)
797 /* NetVSC-specific */
798 #define VMBUS_RQST_ID_NO_RESPONSE (U64_MAX - 2)
799 /* StorVSC-specific */
800 #define VMBUS_RQST_INIT (U64_MAX - 2)
801 #define VMBUS_RQST_RESET (U64_MAX - 3)
803 struct vmbus_device {
807 bool allowed_in_isolated;
810 #define VMBUS_DEFAULT_MAX_PKT_SIZE 4096
812 struct vmbus_channel {
813 struct list_head listentry;
815 struct hv_device *device_obj;
817 enum vmbus_channel_state state;
819 struct vmbus_channel_offer_channel offermsg;
821 * These are based on the OfferMsg.MonitorId.
822 * Save it here for easy access.
827 bool rescind; /* got rescind msg */
828 bool rescind_ref; /* got rescind msg, got channel reference */
829 struct completion rescind_event;
831 u32 ringbuffer_gpadlhandle;
833 /* Allocated memory for ring buffer */
834 struct page *ringbuffer_page;
835 u32 ringbuffer_pagecount;
836 u32 ringbuffer_send_offset;
837 struct hv_ring_buffer_info outbound; /* send to parent */
838 struct hv_ring_buffer_info inbound; /* receive from parent */
840 struct vmbus_close_msg close_msg;
843 u64 interrupts; /* Host to Guest interrupts */
844 u64 sig_events; /* Guest to Host events */
847 * Guest to host interrupts caused by the outbound ring buffer changing
848 * from empty to not empty.
853 * Indicates that a full outbound ring buffer was encountered. The flag
854 * is set to true when a full outbound ring buffer is encountered and
855 * set to false when a write to the outbound ring buffer is completed.
859 /* Channel callback's invoked in softirq context */
860 struct tasklet_struct callback_event;
861 void (*onchannel_callback)(void *context);
862 void *channel_callback_context;
864 void (*change_target_cpu_callback)(struct vmbus_channel *channel,
868 * Synchronize channel scheduling and channel removal; see the inline
869 * comments in vmbus_chan_sched() and vmbus_reset_channel_cb().
871 spinlock_t sched_lock;
874 * A channel can be marked for one of three modes of reading:
875 * BATCHED - callback called from taslket and should read
876 * channel until empty. Interrupts from the host
877 * are masked while read is in process (default).
878 * DIRECT - callback called from tasklet (softirq).
879 * ISR - callback called in interrupt context and must
880 * invoke its own deferred processing.
881 * Host interrupts are disabled and must be re-enabled
882 * when ring is empty.
884 enum hv_callback_mode {
890 bool is_dedicated_interrupt;
894 * Starting with win8, this field will be used to specify the
895 * target CPU on which to deliver the interrupt for the host
896 * to guest communication.
898 * Prior to win8, incoming channel interrupts would only be
899 * delivered on CPU 0. Setting this value to 0 would preserve
900 * the earlier behavior.
904 * Support for sub-channels. For high performance devices,
905 * it will be useful to have multiple sub-channels to support
906 * a scalable communication infrastructure with the host.
907 * The support for sub-channels is implemented as an extension
908 * to the current infrastructure.
909 * The initial offer is considered the primary channel and this
910 * offer message will indicate if the host supports sub-channels.
911 * The guest is free to ask for sub-channels to be offered and can
912 * open these sub-channels as a normal "primary" channel. However,
913 * all sub-channels will have the same type and instance guids as the
914 * primary channel. Requests sent on a given channel will result in a
915 * response on the same channel.
919 * Sub-channel creation callback. This callback will be called in
920 * process context when a sub-channel offer is received from the host.
921 * The guest can open the sub-channel in the context of this callback.
923 void (*sc_creation_callback)(struct vmbus_channel *new_sc);
926 * Channel rescind callback. Some channels (the hvsock ones), need to
927 * register a callback which is invoked in vmbus_onoffer_rescind().
929 void (*chn_rescind_callback)(struct vmbus_channel *channel);
932 * All Sub-channels of a primary channel are linked here.
934 struct list_head sc_list;
936 * The primary channel this sub-channel belongs to.
937 * This will be NULL for the primary channel.
939 struct vmbus_channel *primary_channel;
941 * Support per-channel state for use by vmbus drivers.
943 void *per_channel_state;
946 * Defer freeing channel until after all cpu's have
947 * gone through grace period.
952 * For sysfs per-channel properties.
957 * For performance critical channels (storage, networking
958 * etc,), Hyper-V has a mechanism to enhance the throughput
959 * at the expense of latency:
960 * When the host is to be signaled, we just set a bit in a shared page
961 * and this bit will be inspected by the hypervisor within a certain
962 * window and if the bit is set, the host will be signaled. The window
963 * of time is the monitor latency - currently around 100 usecs. This
964 * mechanism improves throughput by:
966 * A) Making the host more efficient - each time it wakes up,
967 * potentially it will process morev number of packets. The
968 * monitor latency allows a batch to build up.
969 * B) By deferring the hypercall to signal, we will also minimize
972 * Clearly, these optimizations improve throughput at the expense of
973 * latency. Furthermore, since the channel is shared for both
974 * control and data messages, control messages currently suffer
975 * unnecessary latency adversely impacting performance and boot
976 * time. To fix this issue, permit tagging the channel as being
977 * in "low latency" mode. In this mode, we will bypass the monitor
985 * Cache the device ID here for easy access; this is useful, in
986 * particular, in situations where the channel's device_obj has
987 * not been allocated/initialized yet.
992 * We must offload the handling of the primary/sub channels
993 * from the single-threaded vmbus_connection.work_queue to
994 * two different workqueue, otherwise we can block
995 * vmbus_connection.work_queue and hang: see vmbus_process_offer().
997 struct work_struct add_channel_work;
1000 * Guest to host interrupts caused by the inbound ring buffer changing
1001 * from full to not full while a packet is waiting.
1006 * The total number of write operations that encountered a full
1007 * outbound ring buffer.
1012 * The number of write operations that were the first to encounter a
1013 * full outbound ring buffer.
1017 /* enabling/disabling fuzz testing on the channel (default is false)*/
1018 bool fuzz_testing_state;
1021 * Interrupt delay will delay the guest from emptying the ring buffer
1022 * for a specific amount of time. The delay is in microseconds and will
1023 * be between 1 to a maximum of 1000, its default is 0 (no delay).
1024 * The Message delay will delay guest reading on a per message basis
1025 * in microseconds between 1 to 1000 with the default being 0
1028 u32 fuzz_testing_interrupt_delay;
1029 u32 fuzz_testing_message_delay;
1031 /* callback to generate a request ID from a request address */
1032 u64 (*next_request_id_callback)(struct vmbus_channel *channel, u64 rqst_addr);
1033 /* callback to retrieve a request address from a request ID */
1034 u64 (*request_addr_callback)(struct vmbus_channel *channel, u64 rqst_id);
1036 /* request/transaction ids for VMBus */
1037 struct vmbus_requestor requestor;
1040 /* The max size of a packet on this channel */
1044 u64 vmbus_next_request_id(struct vmbus_channel *channel, u64 rqst_addr);
1045 u64 vmbus_request_addr(struct vmbus_channel *channel, u64 trans_id);
1047 static inline bool is_hvsock_channel(const struct vmbus_channel *c)
1049 return !!(c->offermsg.offer.chn_flags &
1050 VMBUS_CHANNEL_TLNPI_PROVIDER_OFFER);
1053 static inline bool is_sub_channel(const struct vmbus_channel *c)
1055 return c->offermsg.offer.sub_channel_index != 0;
1058 static inline void set_channel_read_mode(struct vmbus_channel *c,
1059 enum hv_callback_mode mode)
1061 c->callback_mode = mode;
1064 static inline void set_per_channel_state(struct vmbus_channel *c, void *s)
1066 c->per_channel_state = s;
1069 static inline void *get_per_channel_state(struct vmbus_channel *c)
1071 return c->per_channel_state;
1074 static inline void set_channel_pending_send_size(struct vmbus_channel *c,
1077 unsigned long flags;
1080 spin_lock_irqsave(&c->outbound.ring_lock, flags);
1081 ++c->out_full_total;
1083 if (!c->out_full_flag) {
1084 ++c->out_full_first;
1085 c->out_full_flag = true;
1087 spin_unlock_irqrestore(&c->outbound.ring_lock, flags);
1089 c->out_full_flag = false;
1092 c->outbound.ring_buffer->pending_send_sz = size;
1095 static inline void set_low_latency_mode(struct vmbus_channel *c)
1097 c->low_latency = true;
1100 static inline void clear_low_latency_mode(struct vmbus_channel *c)
1102 c->low_latency = false;
1105 void vmbus_onmessage(struct vmbus_channel_message_header *hdr);
1107 int vmbus_request_offers(void);
1110 * APIs for managing sub-channels.
1113 void vmbus_set_sc_create_callback(struct vmbus_channel *primary_channel,
1114 void (*sc_cr_cb)(struct vmbus_channel *new_sc));
1116 void vmbus_set_chn_rescind_callback(struct vmbus_channel *channel,
1117 void (*chn_rescind_cb)(struct vmbus_channel *));
1120 * Check if sub-channels have already been offerred. This API will be useful
1121 * when the driver is unloaded after establishing sub-channels. In this case,
1122 * when the driver is re-loaded, the driver would have to check if the
1123 * subchannels have already been established before attempting to request
1124 * the creation of sub-channels.
1125 * This function returns TRUE to indicate that subchannels have already been
1127 * This function should be invoked after setting the callback function for
1128 * sub-channel creation.
1130 bool vmbus_are_subchannels_present(struct vmbus_channel *primary);
1132 /* The format must be the same as struct vmdata_gpa_direct */
1133 struct vmbus_channel_packet_page_buffer {
1141 struct hv_page_buffer range[MAX_PAGE_BUFFER_COUNT];
1144 /* The format must be the same as struct vmdata_gpa_direct */
1145 struct vmbus_channel_packet_multipage_buffer {
1152 u32 rangecount; /* Always 1 in this case */
1153 struct hv_multipage_buffer range;
1156 /* The format must be the same as struct vmdata_gpa_direct */
1157 struct vmbus_packet_mpb_array {
1164 u32 rangecount; /* Always 1 in this case */
1165 struct hv_mpb_array range;
1168 int vmbus_alloc_ring(struct vmbus_channel *channel,
1169 u32 send_size, u32 recv_size);
1170 void vmbus_free_ring(struct vmbus_channel *channel);
1172 int vmbus_connect_ring(struct vmbus_channel *channel,
1173 void (*onchannel_callback)(void *context),
1175 int vmbus_disconnect_ring(struct vmbus_channel *channel);
1177 extern int vmbus_open(struct vmbus_channel *channel,
1178 u32 send_ringbuffersize,
1179 u32 recv_ringbuffersize,
1182 void (*onchannel_callback)(void *context),
1185 extern void vmbus_close(struct vmbus_channel *channel);
1187 extern int vmbus_sendpacket(struct vmbus_channel *channel,
1191 enum vmbus_packet_type type,
1194 extern int vmbus_sendpacket_pagebuffer(struct vmbus_channel *channel,
1195 struct hv_page_buffer pagebuffers[],
1201 extern int vmbus_sendpacket_mpb_desc(struct vmbus_channel *channel,
1202 struct vmbus_packet_mpb_array *mpb,
1208 extern int vmbus_establish_gpadl(struct vmbus_channel *channel,
1213 extern int vmbus_teardown_gpadl(struct vmbus_channel *channel,
1216 void vmbus_reset_channel_cb(struct vmbus_channel *channel);
1218 extern int vmbus_recvpacket(struct vmbus_channel *channel,
1221 u32 *buffer_actual_len,
1224 extern int vmbus_recvpacket_raw(struct vmbus_channel *channel,
1227 u32 *buffer_actual_len,
1231 extern void vmbus_ontimer(unsigned long data);
1233 /* Base driver object */
1238 * A hvsock offer, which has a VMBUS_CHANNEL_TLNPI_PROVIDER_OFFER
1239 * channel flag, actually doesn't mean a synthetic device because the
1240 * offer's if_type/if_instance can change for every new hvsock
1243 * However, to facilitate the notification of new-offer/rescind-offer
1244 * from vmbus driver to hvsock driver, we can handle hvsock offer as
1245 * a special vmbus device, and hence we need the below flag to
1246 * indicate if the driver is the hvsock driver or not: we need to
1247 * specially treat the hvosck offer & driver in vmbus_match().
1251 /* the device type supported by this driver */
1253 const struct hv_vmbus_device_id *id_table;
1255 struct device_driver driver;
1257 /* dynamic device GUID's */
1260 struct list_head list;
1263 int (*probe)(struct hv_device *, const struct hv_vmbus_device_id *);
1264 int (*remove)(struct hv_device *);
1265 void (*shutdown)(struct hv_device *);
1267 int (*suspend)(struct hv_device *);
1268 int (*resume)(struct hv_device *);
1272 /* Base device object */
1274 /* the device type id of this device */
1277 /* the device instance id of this device */
1278 guid_t dev_instance;
1282 struct device device;
1283 char *driver_override; /* Driver name to force a match */
1285 struct vmbus_channel *channel;
1286 struct kset *channels_kset;
1288 /* place holder to keep track of the dir for hv device in debugfs */
1289 struct dentry *debug_dir;
1294 static inline struct hv_device *device_to_hv_device(struct device *d)
1296 return container_of(d, struct hv_device, device);
1299 static inline struct hv_driver *drv_to_hv_drv(struct device_driver *d)
1301 return container_of(d, struct hv_driver, driver);
1304 static inline void hv_set_drvdata(struct hv_device *dev, void *data)
1306 dev_set_drvdata(&dev->device, data);
1309 static inline void *hv_get_drvdata(struct hv_device *dev)
1311 return dev_get_drvdata(&dev->device);
1314 struct hv_ring_buffer_debug_info {
1315 u32 current_interrupt_mask;
1316 u32 current_read_index;
1317 u32 current_write_index;
1318 u32 bytes_avail_toread;
1319 u32 bytes_avail_towrite;
1323 int hv_ringbuffer_get_debuginfo(struct hv_ring_buffer_info *ring_info,
1324 struct hv_ring_buffer_debug_info *debug_info);
1326 /* Vmbus interface */
1327 #define vmbus_driver_register(driver) \
1328 __vmbus_driver_register(driver, THIS_MODULE, KBUILD_MODNAME)
1329 int __must_check __vmbus_driver_register(struct hv_driver *hv_driver,
1330 struct module *owner,
1331 const char *mod_name);
1332 void vmbus_driver_unregister(struct hv_driver *hv_driver);
1334 void vmbus_hvsock_device_unregister(struct vmbus_channel *channel);
1336 int vmbus_allocate_mmio(struct resource **new, struct hv_device *device_obj,
1337 resource_size_t min, resource_size_t max,
1338 resource_size_t size, resource_size_t align,
1339 bool fb_overlap_ok);
1340 void vmbus_free_mmio(resource_size_t start, resource_size_t size);
1343 * GUID definitions of various offer types - services offered to the guest.
1348 * {f8615163-df3e-46c5-913f-f2d2f965ed0e}
1350 #define HV_NIC_GUID \
1351 .guid = GUID_INIT(0xf8615163, 0xdf3e, 0x46c5, 0x91, 0x3f, \
1352 0xf2, 0xd2, 0xf9, 0x65, 0xed, 0x0e)
1356 * {32412632-86cb-44a2-9b5c-50d1417354f5}
1358 #define HV_IDE_GUID \
1359 .guid = GUID_INIT(0x32412632, 0x86cb, 0x44a2, 0x9b, 0x5c, \
1360 0x50, 0xd1, 0x41, 0x73, 0x54, 0xf5)
1364 * {ba6163d9-04a1-4d29-b605-72e2ffb1dc7f}
1366 #define HV_SCSI_GUID \
1367 .guid = GUID_INIT(0xba6163d9, 0x04a1, 0x4d29, 0xb6, 0x05, \
1368 0x72, 0xe2, 0xff, 0xb1, 0xdc, 0x7f)
1372 * {0e0b6031-5213-4934-818b-38d90ced39db}
1374 #define HV_SHUTDOWN_GUID \
1375 .guid = GUID_INIT(0x0e0b6031, 0x5213, 0x4934, 0x81, 0x8b, \
1376 0x38, 0xd9, 0x0c, 0xed, 0x39, 0xdb)
1380 * {9527E630-D0AE-497b-ADCE-E80AB0175CAF}
1382 #define HV_TS_GUID \
1383 .guid = GUID_INIT(0x9527e630, 0xd0ae, 0x497b, 0xad, 0xce, \
1384 0xe8, 0x0a, 0xb0, 0x17, 0x5c, 0xaf)
1388 * {57164f39-9115-4e78-ab55-382f3bd5422d}
1390 #define HV_HEART_BEAT_GUID \
1391 .guid = GUID_INIT(0x57164f39, 0x9115, 0x4e78, 0xab, 0x55, \
1392 0x38, 0x2f, 0x3b, 0xd5, 0x42, 0x2d)
1396 * {a9a0f4e7-5a45-4d96-b827-8a841e8c03e6}
1398 #define HV_KVP_GUID \
1399 .guid = GUID_INIT(0xa9a0f4e7, 0x5a45, 0x4d96, 0xb8, 0x27, \
1400 0x8a, 0x84, 0x1e, 0x8c, 0x03, 0xe6)
1403 * Dynamic memory GUID
1404 * {525074dc-8985-46e2-8057-a307dc18a502}
1406 #define HV_DM_GUID \
1407 .guid = GUID_INIT(0x525074dc, 0x8985, 0x46e2, 0x80, 0x57, \
1408 0xa3, 0x07, 0xdc, 0x18, 0xa5, 0x02)
1412 * {cfa8b69e-5b4a-4cc0-b98b-8ba1a1f3f95a}
1414 #define HV_MOUSE_GUID \
1415 .guid = GUID_INIT(0xcfa8b69e, 0x5b4a, 0x4cc0, 0xb9, 0x8b, \
1416 0x8b, 0xa1, 0xa1, 0xf3, 0xf9, 0x5a)
1420 * {f912ad6d-2b17-48ea-bd65-f927a61c7684}
1422 #define HV_KBD_GUID \
1423 .guid = GUID_INIT(0xf912ad6d, 0x2b17, 0x48ea, 0xbd, 0x65, \
1424 0xf9, 0x27, 0xa6, 0x1c, 0x76, 0x84)
1427 * VSS (Backup/Restore) GUID
1429 #define HV_VSS_GUID \
1430 .guid = GUID_INIT(0x35fa2e29, 0xea23, 0x4236, 0x96, 0xae, \
1431 0x3a, 0x6e, 0xba, 0xcb, 0xa4, 0x40)
1433 * Synthetic Video GUID
1434 * {DA0A7802-E377-4aac-8E77-0558EB1073F8}
1436 #define HV_SYNTHVID_GUID \
1437 .guid = GUID_INIT(0xda0a7802, 0xe377, 0x4aac, 0x8e, 0x77, \
1438 0x05, 0x58, 0xeb, 0x10, 0x73, 0xf8)
1442 * {2f9bcc4a-0069-4af3-b76b-6fd0be528cda}
1444 #define HV_SYNTHFC_GUID \
1445 .guid = GUID_INIT(0x2f9bcc4a, 0x0069, 0x4af3, 0xb7, 0x6b, \
1446 0x6f, 0xd0, 0xbe, 0x52, 0x8c, 0xda)
1449 * Guest File Copy Service
1450 * {34D14BE3-DEE4-41c8-9AE7-6B174977C192}
1453 #define HV_FCOPY_GUID \
1454 .guid = GUID_INIT(0x34d14be3, 0xdee4, 0x41c8, 0x9a, 0xe7, \
1455 0x6b, 0x17, 0x49, 0x77, 0xc1, 0x92)
1458 * NetworkDirect. This is the guest RDMA service.
1459 * {8c2eaf3d-32a7-4b09-ab99-bd1f1c86b501}
1461 #define HV_ND_GUID \
1462 .guid = GUID_INIT(0x8c2eaf3d, 0x32a7, 0x4b09, 0xab, 0x99, \
1463 0xbd, 0x1f, 0x1c, 0x86, 0xb5, 0x01)
1466 * PCI Express Pass Through
1467 * {44C4F61D-4444-4400-9D52-802E27EDE19F}
1470 #define HV_PCIE_GUID \
1471 .guid = GUID_INIT(0x44c4f61d, 0x4444, 0x4400, 0x9d, 0x52, \
1472 0x80, 0x2e, 0x27, 0xed, 0xe1, 0x9f)
1475 * Linux doesn't support the 3 devices: the first two are for
1476 * Automatic Virtual Machine Activation, and the third is for
1477 * Remote Desktop Virtualization.
1478 * {f8e65716-3cb3-4a06-9a60-1889c5cccab5}
1479 * {3375baf4-9e15-4b30-b765-67acb10d607b}
1480 * {276aacf4-ac15-426c-98dd-7521ad3f01fe}
1483 #define HV_AVMA1_GUID \
1484 .guid = GUID_INIT(0xf8e65716, 0x3cb3, 0x4a06, 0x9a, 0x60, \
1485 0x18, 0x89, 0xc5, 0xcc, 0xca, 0xb5)
1487 #define HV_AVMA2_GUID \
1488 .guid = GUID_INIT(0x3375baf4, 0x9e15, 0x4b30, 0xb7, 0x65, \
1489 0x67, 0xac, 0xb1, 0x0d, 0x60, 0x7b)
1491 #define HV_RDV_GUID \
1492 .guid = GUID_INIT(0x276aacf4, 0xac15, 0x426c, 0x98, 0xdd, \
1493 0x75, 0x21, 0xad, 0x3f, 0x01, 0xfe)
1496 * Common header for Hyper-V ICs
1499 #define ICMSGTYPE_NEGOTIATE 0
1500 #define ICMSGTYPE_HEARTBEAT 1
1501 #define ICMSGTYPE_KVPEXCHANGE 2
1502 #define ICMSGTYPE_SHUTDOWN 3
1503 #define ICMSGTYPE_TIMESYNC 4
1504 #define ICMSGTYPE_VSS 5
1505 #define ICMSGTYPE_FCOPY 7
1507 #define ICMSGHDRFLAG_TRANSACTION 1
1508 #define ICMSGHDRFLAG_REQUEST 2
1509 #define ICMSGHDRFLAG_RESPONSE 4
1513 * While we want to handle util services as regular devices,
1514 * there is only one instance of each of these services; so
1515 * we statically allocate the service specific state.
1518 struct hv_util_service {
1521 void (*util_cb)(void *);
1522 int (*util_init)(struct hv_util_service *);
1523 void (*util_deinit)(void);
1524 int (*util_pre_suspend)(void);
1525 int (*util_pre_resume)(void);
1528 struct vmbuspipe_hdr {
1539 struct ic_version icverframe;
1541 struct ic_version icvermsg;
1544 u8 ictransaction_id;
1549 #define IC_VERSION_NEGOTIATION_MAX_VER_COUNT 100
1550 #define ICMSG_HDR (sizeof(struct vmbuspipe_hdr) + sizeof(struct icmsg_hdr))
1551 #define ICMSG_NEGOTIATE_PKT_SIZE(icframe_vercnt, icmsg_vercnt) \
1552 (ICMSG_HDR + sizeof(struct icmsg_negotiate) + \
1553 (((icframe_vercnt) + (icmsg_vercnt)) * sizeof(struct ic_version)))
1555 struct icmsg_negotiate {
1559 struct ic_version icversion_data[]; /* any size array */
1562 struct shutdown_msg_data {
1564 u32 timeout_seconds;
1566 u8 display_message[2048];
1569 struct heartbeat_msg_data {
1574 /* Time Sync IC defs */
1575 #define ICTIMESYNCFLAG_PROBE 0
1576 #define ICTIMESYNCFLAG_SYNC 1
1577 #define ICTIMESYNCFLAG_SAMPLE 2
1580 #define WLTIMEDELTA 116444736000000000L /* in 100ns unit */
1582 #define WLTIMEDELTA 116444736000000000LL
1585 struct ictimesync_data {
1592 struct ictimesync_ref_data {
1594 u64 vmreferencetime;
1601 struct hyperv_service_callback {
1605 struct vmbus_channel *channel;
1606 void (*callback)(void *context);
1609 #define MAX_SRV_VER 0x7ffffff
1610 extern bool vmbus_prep_negotiate_resp(struct icmsg_hdr *icmsghdrp, u8 *buf, u32 buflen,
1611 const int *fw_version, int fw_vercnt,
1612 const int *srv_version, int srv_vercnt,
1613 int *nego_fw_version, int *nego_srv_version);
1615 void hv_process_channel_removal(struct vmbus_channel *channel);
1617 void vmbus_setevent(struct vmbus_channel *channel);
1619 * Negotiated version with the Host.
1622 extern __u32 vmbus_proto_version;
1624 int vmbus_send_tl_connect_request(const guid_t *shv_guest_servie_id,
1625 const guid_t *shv_host_servie_id);
1626 int vmbus_send_modifychannel(struct vmbus_channel *channel, u32 target_vp);
1627 void vmbus_set_event(struct vmbus_channel *channel);
1629 /* Get the start of the ring buffer. */
1630 static inline void *
1631 hv_get_ring_buffer(const struct hv_ring_buffer_info *ring_info)
1633 return ring_info->ring_buffer->buffer;
1637 * Mask off host interrupt callback notifications
1639 static inline void hv_begin_read(struct hv_ring_buffer_info *rbi)
1641 rbi->ring_buffer->interrupt_mask = 1;
1643 /* make sure mask update is not reordered */
1648 * Re-enable host callback and return number of outstanding bytes
1650 static inline u32 hv_end_read(struct hv_ring_buffer_info *rbi)
1653 rbi->ring_buffer->interrupt_mask = 0;
1655 /* make sure mask update is not reordered */
1659 * Now check to see if the ring buffer is still empty.
1660 * If it is not, we raced and we need to process new
1661 * incoming messages.
1663 return hv_get_bytes_to_read(rbi);
1667 * An API to support in-place processing of incoming VMBUS packets.
1670 /* Get data payload associated with descriptor */
1671 static inline void *hv_pkt_data(const struct vmpacket_descriptor *desc)
1673 return (void *)((unsigned long)desc + (desc->offset8 << 3));
1676 /* Get data size associated with descriptor */
1677 static inline u32 hv_pkt_datalen(const struct vmpacket_descriptor *desc)
1679 return (desc->len8 << 3) - (desc->offset8 << 3);
1683 struct vmpacket_descriptor *
1684 hv_pkt_iter_first_raw(struct vmbus_channel *channel);
1686 struct vmpacket_descriptor *
1687 hv_pkt_iter_first(struct vmbus_channel *channel);
1689 struct vmpacket_descriptor *
1690 __hv_pkt_iter_next(struct vmbus_channel *channel,
1691 const struct vmpacket_descriptor *pkt,
1694 void hv_pkt_iter_close(struct vmbus_channel *channel);
1696 static inline struct vmpacket_descriptor *
1697 hv_pkt_iter_next_pkt(struct vmbus_channel *channel,
1698 const struct vmpacket_descriptor *pkt,
1701 struct vmpacket_descriptor *nxt;
1703 nxt = __hv_pkt_iter_next(channel, pkt, copy);
1705 hv_pkt_iter_close(channel);
1711 * Get next packet descriptor without copying it out of the ring buffer
1712 * If at end of list, return NULL and update host.
1714 static inline struct vmpacket_descriptor *
1715 hv_pkt_iter_next_raw(struct vmbus_channel *channel,
1716 const struct vmpacket_descriptor *pkt)
1718 return hv_pkt_iter_next_pkt(channel, pkt, false);
1722 * Get next packet descriptor from iterator
1723 * If at end of list, return NULL and update host.
1725 static inline struct vmpacket_descriptor *
1726 hv_pkt_iter_next(struct vmbus_channel *channel,
1727 const struct vmpacket_descriptor *pkt)
1729 return hv_pkt_iter_next_pkt(channel, pkt, true);
1732 #define foreach_vmbus_pkt(pkt, channel) \
1733 for (pkt = hv_pkt_iter_first(channel); pkt; \
1734 pkt = hv_pkt_iter_next(channel, pkt))
1737 * Interface for passing data between SR-IOV PF and VF drivers. The VF driver
1738 * sends requests to read and write blocks. Each block must be 128 bytes or
1739 * smaller. Optionally, the VF driver can register a callback function which
1740 * will be invoked when the host says that one or more of the first 64 block
1741 * IDs is "invalid" which means that the VF driver should reread them.
1743 #define HV_CONFIG_BLOCK_SIZE_MAX 128
1745 int hyperv_read_cfg_blk(struct pci_dev *dev, void *buf, unsigned int buf_len,
1746 unsigned int block_id, unsigned int *bytes_returned);
1747 int hyperv_write_cfg_blk(struct pci_dev *dev, void *buf, unsigned int len,
1748 unsigned int block_id);
1749 int hyperv_reg_block_invalidate(struct pci_dev *dev, void *context,
1750 void (*block_invalidate)(void *context,
1753 struct hyperv_pci_block_ops {
1754 int (*read_block)(struct pci_dev *dev, void *buf, unsigned int buf_len,
1755 unsigned int block_id, unsigned int *bytes_returned);
1756 int (*write_block)(struct pci_dev *dev, void *buf, unsigned int len,
1757 unsigned int block_id);
1758 int (*reg_blk_invalidate)(struct pci_dev *dev, void *context,
1759 void (*block_invalidate)(void *context,
1763 extern struct hyperv_pci_block_ops hvpci_block_ops;
1765 static inline unsigned long virt_to_hvpfn(void *addr)
1769 if (is_vmalloc_addr(addr))
1770 paddr = page_to_phys(vmalloc_to_page(addr)) +
1771 offset_in_page(addr);
1775 return paddr >> HV_HYP_PAGE_SHIFT;
1778 #define NR_HV_HYP_PAGES_IN_PAGE (PAGE_SIZE / HV_HYP_PAGE_SIZE)
1779 #define offset_in_hvpage(ptr) ((unsigned long)(ptr) & ~HV_HYP_PAGE_MASK)
1780 #define HVPFN_UP(x) (((x) + HV_HYP_PAGE_SIZE-1) >> HV_HYP_PAGE_SHIFT)
1781 #define HVPFN_DOWN(x) ((x) >> HV_HYP_PAGE_SHIFT)
1782 #define page_to_hvpfn(page) (page_to_pfn(page) * NR_HV_HYP_PAGES_IN_PAGE)
1784 #endif /* _HYPERV_H */