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Edit File: hyperv.h

/* SPDX-License-Identifier: GPL-2.0-only */ /* * * Copyright (c) 2011, Microsoft Corporation. * * Authors: * Haiyang Zhang <haiyangz@microsoft.com> * Hank Janssen <hjanssen@microsoft.com> * K. Y. Srinivasan <kys@microsoft.com> */ #ifndef _HYPERV_H #define _HYPERV_H #include <uapi/linux/hyperv.h> #include <linux/mm.h> #include <linux/types.h> #include <linux/scatterlist.h> #include <linux/list.h> #include <linux/timer.h> #include <linux/completion.h> #include <linux/device.h> #include <linux/mod_devicetable.h> #include <linux/interrupt.h> #include <linux/reciprocal_div.h> #include <asm/hyperv-tlfs.h> #define MAX_PAGE_BUFFER_COUNT 32 #define MAX_MULTIPAGE_BUFFER_COUNT 32 /* 128K */ #pragma pack(push, 1) /* * Types for GPADL, decides is how GPADL header is created. * * It doesn't make much difference between BUFFER and RING if PAGE_SIZE is the * same as HV_HYP_PAGE_SIZE. * * If PAGE_SIZE is bigger than HV_HYP_PAGE_SIZE, the headers of ring buffers * will be of PAGE_SIZE, however, only the first HV_HYP_PAGE will be put * into gpadl, therefore the number for HV_HYP_PAGE and the indexes of each * HV_HYP_PAGE will be different between different types of GPADL, for example * if PAGE_SIZE is 64K: * * BUFFER: * * gva: |-- 64k --|-- 64k --| ... | * gpa: | 4k | 4k | ... | 4k | 4k | 4k | ... | 4k | * index: 0 1 2 15 16 17 18 .. 31 32 ... * | | ... | | | ... | ... * v V V V V V * gpadl: | 4k | 4k | ... | 4k | 4k | 4k | ... | 4k | ... | * index: 0 1 2 ... 15 16 17 18 .. 31 32 ... * * RING: * * | header | data | header | data | * gva: |-- 64k --|-- 64k --| ... |-- 64k --|-- 64k --| ... | * gpa: | 4k | .. | 4k | 4k | ... | 4k | ... | 4k | .. | 4k | .. | ... | * index: 0 1 16 17 18 31 ... n n+1 n+16 ... 2n * | / / / | / / * | / / / | / / * | / / ... / ... | / ... / * | / / / | / / * | / / / | / / * V V V V V V v * gpadl: | 4k | 4k | ... | ... | 4k | 4k | ... | * index: 0 1 2 ... 16 ... n-15 n-14 n-13 ... 2n-30 */ enum hv_gpadl_type { HV_GPADL_BUFFER, HV_GPADL_RING }; /* Single-page buffer */ struct hv_page_buffer { u32 len; u32 offset; u64 pfn; }; /* Multiple-page buffer */ struct hv_multipage_buffer { /* Length and Offset determines the # of pfns in the array */ u32 len; u32 offset; u64 pfn_array[MAX_MULTIPAGE_BUFFER_COUNT]; }; /* * Multiple-page buffer array; the pfn array is variable size: * The number of entries in the PFN array is determined by * "len" and "offset". */ struct hv_mpb_array { /* Length and Offset determines the # of pfns in the array */ u32 len; u32 offset; u64 pfn_array[]; }; /* 0x18 includes the proprietary packet header */ #define MAX_PAGE_BUFFER_PACKET (0x18 + \ (sizeof(struct hv_page_buffer) * \ MAX_PAGE_BUFFER_COUNT)) #define MAX_MULTIPAGE_BUFFER_PACKET (0x18 + \ sizeof(struct hv_multipage_buffer)) #pragma pack(pop) struct hv_ring_buffer { /* Offset in bytes from the start of ring data below */ u32 write_index; /* Offset in bytes from the start of ring data below */ u32 read_index; u32 interrupt_mask; /* * WS2012/Win8 and later versions of Hyper-V implement interrupt * driven flow management. The feature bit feat_pending_send_sz * is set by the host on the host->guest ring buffer, and by the * guest on the guest->host ring buffer. * * The meaning of the feature bit is a bit complex in that it has * semantics that apply to both ring buffers. If the guest sets * the feature bit in the guest->host ring buffer, the guest is * telling the host that: * 1) It will set the pending_send_sz field in the guest->host ring * buffer when it is waiting for space to become available, and * 2) It will read the pending_send_sz field in the host->guest * ring buffer and interrupt the host when it frees enough space * * Similarly, if the host sets the feature bit in the host->guest * ring buffer, the host is telling the guest that: * 1) It will set the pending_send_sz field in the host->guest ring * buffer when it is waiting for space to become available, and * 2) It will read the pending_send_sz field in the guest->host * ring buffer and interrupt the guest when it frees enough space * * If either the guest or host does not set the feature bit that it * owns, that guest or host must do polling if it encounters a full * ring buffer, and not signal the other end with an interrupt. */ u32 pending_send_sz; u32 reserved1[12]; union { struct { u32 feat_pending_send_sz:1; }; u32 value; } feature_bits; /* Pad it to PAGE_SIZE so that data starts on page boundary */ u8 reserved2[PAGE_SIZE - 68]; /* * Ring data starts here + RingDataStartOffset * !!! DO NOT place any fields below this !!! */ u8 buffer[]; } __packed; /* * If the requested ring buffer size is at least 8 times the size of the * header, steal space from the ring buffer for the header. Otherwise, add * space for the header so that is doesn't take too much of the ring buffer * space. * * The factor of 8 is somewhat arbitrary. The goal is to prevent adding a * relatively small header (4 Kbytes on x86) to a large-ish power-of-2 ring * buffer size (such as 128 Kbytes) and so end up making a nearly twice as * large allocation that will be almost half wasted. As a contrasting example, * on ARM64 with 64 Kbyte page size, we don't want to take 64 Kbytes for the * header from a 128 Kbyte allocation, leaving only 64 Kbytes for the ring. * In this latter case, we must add 64 Kbytes for the header and not worry * about what's wasted. */ #define VMBUS_HEADER_ADJ(payload_sz) \ ((payload_sz) >= 8 * sizeof(struct hv_ring_buffer) ? \ 0 : sizeof(struct hv_ring_buffer)) /* Calculate the proper size of a ringbuffer, it must be page-aligned */ #define VMBUS_RING_SIZE(payload_sz) PAGE_ALIGN(VMBUS_HEADER_ADJ(payload_sz) + \ (payload_sz)) struct hv_ring_buffer_info { struct hv_ring_buffer *ring_buffer; u32 ring_size; /* Include the shared header */ struct reciprocal_value ring_size_div10_reciprocal; spinlock_t ring_lock; u32 ring_datasize; /* < ring_size */ u32 priv_read_index; /* * The ring buffer mutex lock. This lock prevents the ring buffer from * being freed while the ring buffer is being accessed. */ struct mutex ring_buffer_mutex; /* Buffer that holds a copy of an incoming host packet */ void *pkt_buffer; u32 pkt_buffer_size; }; static inline u32 hv_get_bytes_to_read(const struct hv_ring_buffer_info *rbi) { u32 read_loc, write_loc, dsize, read; dsize = rbi->ring_datasize; read_loc = rbi->ring_buffer->read_index; write_loc = READ_ONCE(rbi->ring_buffer->write_index); read = write_loc >= read_loc ? (write_loc - read_loc) : (dsize - read_loc) + write_loc; return read; } static inline u32 hv_get_bytes_to_write(const struct hv_ring_buffer_info *rbi) { u32 read_loc, write_loc, dsize, write; dsize = rbi->ring_datasize; read_loc = READ_ONCE(rbi->ring_buffer->read_index); write_loc = rbi->ring_buffer->write_index; write = write_loc >= read_loc ? dsize - (write_loc - read_loc) : read_loc - write_loc; return write; } static inline u32 hv_get_avail_to_write_percent( const struct hv_ring_buffer_info *rbi) { u32 avail_write = hv_get_bytes_to_write(rbi); return reciprocal_divide( (avail_write << 3) + (avail_write << 1), rbi->ring_size_div10_reciprocal); } /* * VMBUS version is 32 bit entity broken up into * two 16 bit quantities: major_number. minor_number. * * 0 . 13 (Windows Server 2008) * 1 . 1 (Windows 7) * 2 . 4 (Windows 8) * 3 . 0 (Windows 8 R2) * 4 . 0 (Windows 10) * 4 . 1 (Windows 10 RS3) * 5 . 0 (Newer Windows 10) * 5 . 1 (Windows 10 RS4) * 5 . 2 (Windows Server 2019, RS5) * 5 . 3 (Windows Server 2022) */ #define VERSION_WS2008 ((0 << 16) | (13)) #define VERSION_WIN7 ((1 << 16) | (1)) #define VERSION_WIN8 ((2 << 16) | (4)) #define VERSION_WIN8_1 ((3 << 16) | (0)) #define VERSION_WIN10 ((4 << 16) | (0)) #define VERSION_WIN10_V4_1 ((4 << 16) | (1)) #define VERSION_WIN10_V5 ((5 << 16) | (0)) #define VERSION_WIN10_V5_1 ((5 << 16) | (1)) #define VERSION_WIN10_V5_2 ((5 << 16) | (2)) #define VERSION_WIN10_V5_3 ((5 << 16) | (3)) /* Make maximum size of pipe payload of 16K */ #define MAX_PIPE_DATA_PAYLOAD (sizeof(u8) * 16384) /* Define PipeMode values. */ #define VMBUS_PIPE_TYPE_BYTE 0x00000000 #define VMBUS_PIPE_TYPE_MESSAGE 0x00000004 /* The size of the user defined data buffer for non-pipe offers. */ #define MAX_USER_DEFINED_BYTES 120 /* The size of the user defined data buffer for pipe offers. */ #define MAX_PIPE_USER_DEFINED_BYTES 116 /* * At the center of the Channel Management library is the Channel Offer. This * struct contains the fundamental information about an offer. */ struct vmbus_channel_offer { guid_t if_type; guid_t if_instance; /* * These two fields are not currently used. */ u64 reserved1; u64 reserved2; u16 chn_flags; u16 mmio_megabytes; /* in bytes * 1024 * 1024 */ union { /* Non-pipes: The user has MAX_USER_DEFINED_BYTES bytes. */ struct { unsigned char user_def[MAX_USER_DEFINED_BYTES]; } std; /* * Pipes: * The following structure is an integrated pipe protocol, which * is implemented on top of standard user-defined data. Pipe * clients have MAX_PIPE_USER_DEFINED_BYTES left for their own * use. */ struct { u32 pipe_mode; unsigned char user_def[MAX_PIPE_USER_DEFINED_BYTES]; } pipe; } u; /* * The sub_channel_index is defined in Win8: a value of zero means a * primary channel and a value of non-zero means a sub-channel. * * Before Win8, the field is reserved, meaning it's always zero. */ u16 sub_channel_index; u16 reserved3; } __packed; /* Server Flags */ #define VMBUS_CHANNEL_ENUMERATE_DEVICE_INTERFACE 1 #define VMBUS_CHANNEL_SERVER_SUPPORTS_TRANSFER_PAGES 2 #define VMBUS_CHANNEL_SERVER_SUPPORTS_GPADLS 4 #define VMBUS_CHANNEL_NAMED_PIPE_MODE 0x10 #define VMBUS_CHANNEL_LOOPBACK_OFFER 0x100 #define VMBUS_CHANNEL_PARENT_OFFER 0x200 #define VMBUS_CHANNEL_REQUEST_MONITORED_NOTIFICATION 0x400 #define VMBUS_CHANNEL_TLNPI_PROVIDER_OFFER 0x2000 struct vmpacket_descriptor { u16 type; u16 offset8; u16 len8; u16 flags; u64 trans_id; } __packed; struct vmpacket_header { u32 prev_pkt_start_offset; struct vmpacket_descriptor descriptor; } __packed; struct vmtransfer_page_range { u32 byte_count; u32 byte_offset; } __packed; struct vmtransfer_page_packet_header { struct vmpacket_descriptor d; u16 xfer_pageset_id; u8 sender_owns_set; u8 reserved; u32 range_cnt; struct vmtransfer_page_range ranges[]; } __packed; struct vmgpadl_packet_header { struct vmpacket_descriptor d; u32 gpadl; u32 reserved; } __packed; struct vmadd_remove_transfer_page_set { struct vmpacket_descriptor d; u32 gpadl; u16 xfer_pageset_id; u16 reserved; } __packed; /* * This structure defines a range in guest physical space that can be made to * look virtually contiguous. */ struct gpa_range { u32 byte_count; u32 byte_offset; u64 pfn_array[]; }; /* * This is the format for an Establish Gpadl packet, which contains a handle by * which this GPADL will be known and a set of GPA ranges associated with it. * This can be converted to a MDL by the guest OS. If there are multiple GPA * ranges, then the resulting MDL will be "chained," representing multiple VA * ranges. */ struct vmestablish_gpadl { struct vmpacket_descriptor d; u32 gpadl; u32 range_cnt; struct gpa_range range[1]; } __packed; /* * This is the format for a Teardown Gpadl packet, which indicates that the * GPADL handle in the Establish Gpadl packet will never be referenced again. */ struct vmteardown_gpadl { struct vmpacket_descriptor d; u32 gpadl; u32 reserved; /* for alignment to a 8-byte boundary */ } __packed; /* * This is the format for a GPA-Direct packet, which contains a set of GPA * ranges, in addition to commands and/or data. */ struct vmdata_gpa_direct { struct vmpacket_descriptor d; u32 reserved; u32 range_cnt; struct gpa_range range[1]; } __packed; /* This is the format for a Additional Data Packet. */ struct vmadditional_data { struct vmpacket_descriptor d; u64 total_bytes; u32 offset; u32 byte_cnt; unsigned char data[1]; } __packed; union vmpacket_largest_possible_header { struct vmpacket_descriptor simple_hdr; struct vmtransfer_page_packet_header xfer_page_hdr; struct vmgpadl_packet_header gpadl_hdr; struct vmadd_remove_transfer_page_set add_rm_xfer_page_hdr; struct vmestablish_gpadl establish_gpadl_hdr; struct vmteardown_gpadl teardown_gpadl_hdr; struct vmdata_gpa_direct data_gpa_direct_hdr; }; #define VMPACKET_DATA_START_ADDRESS(__packet) \ (void *)(((unsigned char *)__packet) + \ ((struct vmpacket_descriptor)__packet)->offset8 * 8) #define VMPACKET_DATA_LENGTH(__packet) \ ((((struct vmpacket_descriptor)__packet)->len8 - \ ((struct vmpacket_descriptor)__packet)->offset8) * 8) #define VMPACKET_TRANSFER_MODE(__packet) \ (((struct IMPACT)__packet)->type) enum vmbus_packet_type { VM_PKT_INVALID = 0x0, VM_PKT_SYNCH = 0x1, VM_PKT_ADD_XFER_PAGESET = 0x2, VM_PKT_RM_XFER_PAGESET = 0x3, VM_PKT_ESTABLISH_GPADL = 0x4, VM_PKT_TEARDOWN_GPADL = 0x5, VM_PKT_DATA_INBAND = 0x6, VM_PKT_DATA_USING_XFER_PAGES = 0x7, VM_PKT_DATA_USING_GPADL = 0x8, VM_PKT_DATA_USING_GPA_DIRECT = 0x9, VM_PKT_CANCEL_REQUEST = 0xa, VM_PKT_COMP = 0xb, VM_PKT_DATA_USING_ADDITIONAL_PKT = 0xc, VM_PKT_ADDITIONAL_DATA = 0xd }; #define VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED 1 /* Version 1 messages */ enum vmbus_channel_message_type { CHANNELMSG_INVALID = 0, CHANNELMSG_OFFERCHANNEL = 1, CHANNELMSG_RESCIND_CHANNELOFFER = 2, CHANNELMSG_REQUESTOFFERS = 3, CHANNELMSG_ALLOFFERS_DELIVERED = 4, CHANNELMSG_OPENCHANNEL = 5, CHANNELMSG_OPENCHANNEL_RESULT = 6, CHANNELMSG_CLOSECHANNEL = 7, CHANNELMSG_GPADL_HEADER = 8, CHANNELMSG_GPADL_BODY = 9, CHANNELMSG_GPADL_CREATED = 10, CHANNELMSG_GPADL_TEARDOWN = 11, CHANNELMSG_GPADL_TORNDOWN = 12, CHANNELMSG_RELID_RELEASED = 13, CHANNELMSG_INITIATE_CONTACT = 14, CHANNELMSG_VERSION_RESPONSE = 15, CHANNELMSG_UNLOAD = 16, CHANNELMSG_UNLOAD_RESPONSE = 17, CHANNELMSG_18 = 18, CHANNELMSG_19 = 19, CHANNELMSG_20 = 20, CHANNELMSG_TL_CONNECT_REQUEST = 21, CHANNELMSG_MODIFYCHANNEL = 22, CHANNELMSG_TL_CONNECT_RESULT = 23, CHANNELMSG_MODIFYCHANNEL_RESPONSE = 24, CHANNELMSG_COUNT }; /* Hyper-V supports about 2048 channels, and the RELIDs start with 1. */ #define INVALID_RELID U32_MAX struct vmbus_channel_message_header { enum vmbus_channel_message_type msgtype; u32 padding; } __packed; /* Query VMBus Version parameters */ struct vmbus_channel_query_vmbus_version { struct vmbus_channel_message_header header; u32 version; } __packed; /* VMBus Version Supported parameters */ struct vmbus_channel_version_supported { struct vmbus_channel_message_header header; u8 version_supported; } __packed; /* Offer Channel parameters */ struct vmbus_channel_offer_channel { struct vmbus_channel_message_header header; struct vmbus_channel_offer offer; u32 child_relid; u8 monitorid; /* * win7 and beyond splits this field into a bit field. */ u8 monitor_allocated:1; u8 reserved:7; /* * These are new fields added in win7 and later. * Do not access these fields without checking the * negotiated protocol. * * If "is_dedicated_interrupt" is set, we must not set the * associated bit in the channel bitmap while sending the * interrupt to the host. * * connection_id is to be used in signaling the host. */ u16 is_dedicated_interrupt:1; u16 reserved1:15; u32 connection_id; } __packed; /* Rescind Offer parameters */ struct vmbus_channel_rescind_offer { struct vmbus_channel_message_header header; u32 child_relid; } __packed; /* * Request Offer -- no parameters, SynIC message contains the partition ID * Set Snoop -- no parameters, SynIC message contains the partition ID * Clear Snoop -- no parameters, SynIC message contains the partition ID * All Offers Delivered -- no parameters, SynIC message contains the partition * ID * Flush Client -- no parameters, SynIC message contains the partition ID */ /* Open Channel parameters */ struct vmbus_channel_open_channel { struct vmbus_channel_message_header header; /* Identifies the specific VMBus channel that is being opened. */ u32 child_relid; /* ID making a particular open request at a channel offer unique. */ u32 openid; /* GPADL for the channel's ring buffer. */ u32 ringbuffer_gpadlhandle; /* * Starting with win8, this field will be used to specify * the target virtual processor on which to deliver the interrupt for * the host to guest communication. * Prior to win8, incoming channel interrupts would only * be delivered on cpu 0. Setting this value to 0 would * preserve the earlier behavior. */ u32 target_vp; /* * The upstream ring buffer begins at offset zero in the memory * described by RingBufferGpadlHandle. The downstream ring buffer * follows it at this offset (in pages). */ u32 downstream_ringbuffer_pageoffset; /* User-specific data to be passed along to the server endpoint. */ unsigned char userdata[MAX_USER_DEFINED_BYTES]; } __packed; /* Open Channel Result parameters */ struct vmbus_channel_open_result { struct vmbus_channel_message_header header; u32 child_relid; u32 openid; u32 status; } __packed; /* Modify Channel Result parameters */ struct vmbus_channel_modifychannel_response { struct vmbus_channel_message_header header; u32 child_relid; u32 status; } __packed; /* Close channel parameters; */ struct vmbus_channel_close_channel { struct vmbus_channel_message_header header; u32 child_relid; } __packed; /* Channel Message GPADL */ #define GPADL_TYPE_RING_BUFFER 1 #define GPADL_TYPE_SERVER_SAVE_AREA 2 #define GPADL_TYPE_TRANSACTION 8 /* * The number of PFNs in a GPADL message is defined by the number of * pages that would be spanned by ByteCount and ByteOffset. If the * implied number of PFNs won't fit in this packet, there will be a * follow-up packet that contains more. */ struct vmbus_channel_gpadl_header { struct vmbus_channel_message_header header; u32 child_relid; u32 gpadl; u16 range_buflen; u16 rangecount; struct gpa_range range[]; } __packed; /* This is the followup packet that contains more PFNs. */ struct vmbus_channel_gpadl_body { struct vmbus_channel_message_header header; u32 msgnumber; u32 gpadl; u64 pfn[]; } __packed; struct vmbus_channel_gpadl_created { struct vmbus_channel_message_header header; u32 child_relid; u32 gpadl; u32 creation_status; } __packed; struct vmbus_channel_gpadl_teardown { struct vmbus_channel_message_header header; u32 child_relid; u32 gpadl; } __packed; struct vmbus_channel_gpadl_torndown { struct vmbus_channel_message_header header; u32 gpadl; } __packed; struct vmbus_channel_relid_released { struct vmbus_channel_message_header header; u32 child_relid; } __packed; struct vmbus_channel_initiate_contact { struct vmbus_channel_message_header header; u32 vmbus_version_requested; u32 target_vcpu; /* The VCPU the host should respond to */ union { u64 interrupt_page; struct { u8 msg_sint; u8 padding1[3]; u32 padding2; }; }; u64 monitor_page1; u64 monitor_page2; } __packed; /* Hyper-V socket: guest's connect()-ing to host */ struct vmbus_channel_tl_connect_request { struct vmbus_channel_message_header header; guid_t guest_endpoint_id; guid_t host_service_id; } __packed; /* Modify Channel parameters, cf. vmbus_send_modifychannel() */ struct vmbus_channel_modifychannel { struct vmbus_channel_message_header header; u32 child_relid; u32 target_vp; } __packed; struct vmbus_channel_version_response { struct vmbus_channel_message_header header; u8 version_supported; u8 connection_state; u16 padding; /* * On new hosts that support VMBus protocol 5.0, we must use * VMBUS_MESSAGE_CONNECTION_ID_4 for the Initiate Contact Message, * and for subsequent messages, we must use the Message Connection ID * field in the host-returned Version Response Message. * * On old hosts, we should always use VMBUS_MESSAGE_CONNECTION_ID (1). */ u32 msg_conn_id; } __packed; enum vmbus_channel_state { CHANNEL_OFFER_STATE, CHANNEL_OPENING_STATE, CHANNEL_OPEN_STATE, CHANNEL_OPENED_STATE, }; /* * Represents each channel msg on the vmbus connection This is a * variable-size data structure depending on the msg type itself */ struct vmbus_channel_msginfo { /* Bookkeeping stuff */ struct list_head msglistentry; /* So far, this is only used to handle gpadl body message */ struct list_head submsglist; /* Synchronize the request/response if needed */ struct completion waitevent; struct vmbus_channel *waiting_channel; union { struct vmbus_channel_version_supported version_supported; struct vmbus_channel_open_result open_result; struct vmbus_channel_gpadl_torndown gpadl_torndown; struct vmbus_channel_gpadl_created gpadl_created; struct vmbus_channel_version_response version_response; struct vmbus_channel_modifychannel_response modify_response; } response; u32 msgsize; /* * The channel message that goes out on the "wire". * It will contain at minimum the VMBUS_CHANNEL_MESSAGE_HEADER header */ unsigned char msg[]; }; struct vmbus_close_msg { struct vmbus_channel_msginfo info; struct vmbus_channel_close_channel msg; }; /* Define connection identifier type. */ union hv_connection_id { u32 asu32; struct { u32 id:24; u32 reserved:8; } u; }; enum vmbus_device_type { HV_IDE = 0, HV_SCSI, HV_FC, HV_NIC, HV_ND, HV_PCIE, HV_FB, HV_KBD, HV_MOUSE, HV_KVP, HV_TS, HV_HB, HV_SHUTDOWN, HV_FCOPY, HV_BACKUP, HV_DM, HV_UNKNOWN, }; /* * Provides request ids for VMBus. Encapsulates guest memory * addresses and stores the next available slot in req_arr * to generate new ids in constant time. */ struct vmbus_requestor { u64 *req_arr; unsigned long *req_bitmap; /* is a given slot available? */ u32 size; u64 next_request_id; spinlock_t req_lock; /* provides atomicity */ }; #define VMBUS_NO_RQSTOR U64_MAX #define VMBUS_RQST_ERROR (U64_MAX - 1) /* NetVSC-specific */ #define VMBUS_RQST_ID_NO_RESPONSE (U64_MAX - 2) /* StorVSC-specific */ #define VMBUS_RQST_INIT (U64_MAX - 2) #define VMBUS_RQST_RESET (U64_MAX - 3) struct vmbus_device { u16 dev_type; guid_t guid; bool perf_device; bool allowed_in_isolated; }; #define VMBUS_DEFAULT_MAX_PKT_SIZE 4096 struct vmbus_channel { struct list_head listentry; struct hv_device *device_obj; enum vmbus_channel_state state; struct vmbus_channel_offer_channel offermsg; /* * These are based on the OfferMsg.MonitorId. * Save it here for easy access. */ u8 monitor_grp; u8 monitor_bit; bool rescind; /* got rescind msg */ bool rescind_ref; /* got rescind msg, got channel reference */ struct completion rescind_event; u32 ringbuffer_gpadlhandle; /* Allocated memory for ring buffer */ struct page *ringbuffer_page; u32 ringbuffer_pagecount; u32 ringbuffer_send_offset; struct hv_ring_buffer_info outbound; /* send to parent */ struct hv_ring_buffer_info inbound; /* receive from parent */ struct vmbus_close_msg close_msg; /* Statistics */ u64 interrupts; /* Host to Guest interrupts */ u64 sig_events; /* Guest to Host events */ /* * Guest to host interrupts caused by the outbound ring buffer changing * from empty to not empty. */ u64 intr_out_empty; /* * Indicates that a full outbound ring buffer was encountered. The flag * is set to true when a full outbound ring buffer is encountered and * set to false when a write to the outbound ring buffer is completed. */ bool out_full_flag; /* Channel callback's invoked in softirq context */ struct tasklet_struct callback_event; void (*onchannel_callback)(void *context); void *channel_callback_context; void (*change_target_cpu_callback)(struct vmbus_channel *channel, u32 old, u32 new); /* * Synchronize channel scheduling and channel removal; see the inline * comments in vmbus_chan_sched() and vmbus_reset_channel_cb(). */ spinlock_t sched_lock; /* * A channel can be marked for one of three modes of reading: * BATCHED - callback called from taslket and should read * channel until empty. Interrupts from the host * are masked while read is in process (default). * DIRECT - callback called from tasklet (softirq). * ISR - callback called in interrupt context and must * invoke its own deferred processing. * Host interrupts are disabled and must be re-enabled * when ring is empty. */ enum hv_callback_mode { HV_CALL_BATCHED, HV_CALL_DIRECT, HV_CALL_ISR } callback_mode; bool is_dedicated_interrupt; u64 sig_event; /* * Starting with win8, this field will be used to specify the * target CPU on which to deliver the interrupt for the host * to guest communication. * * Prior to win8, incoming channel interrupts would only be * delivered on CPU 0. Setting this value to 0 would preserve * the earlier behavior. */ u32 target_cpu; /* * Support for sub-channels. For high performance devices, * it will be useful to have multiple sub-channels to support * a scalable communication infrastructure with the host. * The support for sub-channels is implemented as an extension * to the current infrastructure. * The initial offer is considered the primary channel and this * offer message will indicate if the host supports sub-channels. * The guest is free to ask for sub-channels to be offered and can * open these sub-channels as a normal "primary" channel. However, * all sub-channels will have the same type and instance guids as the * primary channel. Requests sent on a given channel will result in a * response on the same channel. */ /* * Sub-channel creation callback. This callback will be called in * process context when a sub-channel offer is received from the host. * The guest can open the sub-channel in the context of this callback. */ void (*sc_creation_callback)(struct vmbus_channel *new_sc); /* * Channel rescind callback. Some channels (the hvsock ones), need to * register a callback which is invoked in vmbus_onoffer_rescind(). */ void (*chn_rescind_callback)(struct vmbus_channel *channel); /* * All Sub-channels of a primary channel are linked here. */ struct list_head sc_list; /* * The primary channel this sub-channel belongs to. * This will be NULL for the primary channel. */ struct vmbus_channel *primary_channel; /* * Support per-channel state for use by vmbus drivers. */ void *per_channel_state; /* * Defer freeing channel until after all cpu's have * gone through grace period. */ struct rcu_head rcu; /* * For sysfs per-channel properties. */ struct kobject kobj; /* * For performance critical channels (storage, networking * etc,), Hyper-V has a mechanism to enhance the throughput * at the expense of latency: * When the host is to be signaled, we just set a bit in a shared page * and this bit will be inspected by the hypervisor within a certain * window and if the bit is set, the host will be signaled. The window * of time is the monitor latency - currently around 100 usecs. This * mechanism improves throughput by: * * A) Making the host more efficient - each time it wakes up, * potentially it will process morev number of packets. The * monitor latency allows a batch to build up. * B) By deferring the hypercall to signal, we will also minimize * the interrupts. * * Clearly, these optimizations improve throughput at the expense of * latency. Furthermore, since the channel is shared for both * control and data messages, control messages currently suffer * unnecessary latency adversely impacting performance and boot * time. To fix this issue, permit tagging the channel as being * in "low latency" mode. In this mode, we will bypass the monitor * mechanism. */ bool low_latency; bool probe_done; /* * Cache the device ID here for easy access; this is useful, in * particular, in situations where the channel's device_obj has * not been allocated/initialized yet. */ u16 device_id; /* * We must offload the handling of the primary/sub channels * from the single-threaded vmbus_connection.work_queue to * two different workqueue, otherwise we can block * vmbus_connection.work_queue and hang: see vmbus_process_offer(). */ struct work_struct add_channel_work; /* * Guest to host interrupts caused by the inbound ring buffer changing * from full to not full while a packet is waiting. */ u64 intr_in_full; /* * The total number of write operations that encountered a full * outbound ring buffer. */ u64 out_full_total; /* * The number of write operations that were the first to encounter a * full outbound ring buffer. */ u64 out_full_first; /* enabling/disabling fuzz testing on the channel (default is false)*/ bool fuzz_testing_state; /* * Interrupt delay will delay the guest from emptying the ring buffer * for a specific amount of time. The delay is in microseconds and will * be between 1 to a maximum of 1000, its default is 0 (no delay). * The Message delay will delay guest reading on a per message basis * in microseconds between 1 to 1000 with the default being 0 * (no delay). */ u32 fuzz_testing_interrupt_delay; u32 fuzz_testing_message_delay; /* callback to generate a request ID from a request address */ u64 (*next_request_id_callback)(struct vmbus_channel *channel, u64 rqst_addr); /* callback to retrieve a request address from a request ID */ u64 (*request_addr_callback)(struct vmbus_channel *channel, u64 rqst_id); /* request/transaction ids for VMBus */ struct vmbus_requestor requestor; u32 rqstor_size; /* The max size of a packet on this channel */ u32 max_pkt_size; }; u64 vmbus_next_request_id(struct vmbus_channel *channel, u64 rqst_addr); u64 vmbus_request_addr(struct vmbus_channel *channel, u64 trans_id); static inline bool is_hvsock_channel(const struct vmbus_channel *c) { return !!(c->offermsg.offer.chn_flags & VMBUS_CHANNEL_TLNPI_PROVIDER_OFFER); } static inline bool is_sub_channel(const struct vmbus_channel *c) { return c->offermsg.offer.sub_channel_index != 0; } static inline void set_channel_read_mode(struct vmbus_channel *c, enum hv_callback_mode mode) { c->callback_mode = mode; } static inline void set_per_channel_state(struct vmbus_channel *c, void *s) { c->per_channel_state = s; } static inline void *get_per_channel_state(struct vmbus_channel *c) { return c->per_channel_state; } static inline void set_channel_pending_send_size(struct vmbus_channel *c, u32 size) { unsigned long flags; if (size) { spin_lock_irqsave(&c->outbound.ring_lock, flags); ++c->out_full_total; if (!c->out_full_flag) { ++c->out_full_first; c->out_full_flag = true; } spin_unlock_irqrestore(&c->outbound.ring_lock, flags); } else { c->out_full_flag = false; } c->outbound.ring_buffer->pending_send_sz = size; } void vmbus_onmessage(struct vmbus_channel_message_header *hdr); int vmbus_request_offers(void); /* * APIs for managing sub-channels. */ void vmbus_set_sc_create_callback(struct vmbus_channel *primary_channel, void (*sc_cr_cb)(struct vmbus_channel *new_sc)); void vmbus_set_chn_rescind_callback(struct vmbus_channel *channel, void (*chn_rescind_cb)(struct vmbus_channel *)); /* * Check if sub-channels have already been offerred. This API will be useful * when the driver is unloaded after establishing sub-channels. In this case, * when the driver is re-loaded, the driver would have to check if the * subchannels have already been established before attempting to request * the creation of sub-channels. * This function returns TRUE to indicate that subchannels have already been * created. * This function should be invoked after setting the callback function for * sub-channel creation. */ bool vmbus_are_subchannels_present(struct vmbus_channel *primary); /* The format must be the same as struct vmdata_gpa_direct */ struct vmbus_channel_packet_page_buffer { u16 type; u16 dataoffset8; u16 length8; u16 flags; u64 transactionid; u32 reserved; u32 rangecount; struct hv_page_buffer range[MAX_PAGE_BUFFER_COUNT]; } __packed; /* The format must be the same as struct vmdata_gpa_direct */ struct vmbus_channel_packet_multipage_buffer { u16 type; u16 dataoffset8; u16 length8; u16 flags; u64 transactionid; u32 reserved; u32 rangecount; /* Always 1 in this case */ struct hv_multipage_buffer range; } __packed; /* The format must be the same as struct vmdata_gpa_direct */ struct vmbus_packet_mpb_array { u16 type; u16 dataoffset8; u16 length8; u16 flags; u64 transactionid; u32 reserved; u32 rangecount; /* Always 1 in this case */ struct hv_mpb_array range; } __packed; int vmbus_alloc_ring(struct vmbus_channel *channel, u32 send_size, u32 recv_size); void vmbus_free_ring(struct vmbus_channel *channel); int vmbus_connect_ring(struct vmbus_channel *channel, void (*onchannel_callback)(void *context), void *context); int vmbus_disconnect_ring(struct vmbus_channel *channel); extern int vmbus_open(struct vmbus_channel *channel, u32 send_ringbuffersize, u32 recv_ringbuffersize, void *userdata, u32 userdatalen, void (*onchannel_callback)(void *context), void *context); extern void vmbus_close(struct vmbus_channel *channel); extern int vmbus_sendpacket(struct vmbus_channel *channel, void *buffer, u32 bufferLen, u64 requestid, enum vmbus_packet_type type, u32 flags); extern int vmbus_sendpacket_pagebuffer(struct vmbus_channel *channel, struct hv_page_buffer pagebuffers[], u32 pagecount, void *buffer, u32 bufferlen, u64 requestid); extern int vmbus_sendpacket_mpb_desc(struct vmbus_channel *channel, struct vmbus_packet_mpb_array *mpb, u32 desc_size, void *buffer, u32 bufferlen, u64 requestid); extern int vmbus_establish_gpadl(struct vmbus_channel *channel, void *kbuffer, u32 size, u32 *gpadl_handle); extern int vmbus_teardown_gpadl(struct vmbus_channel *channel, u32 gpadl_handle); void vmbus_reset_channel_cb(struct vmbus_channel *channel); extern int vmbus_recvpacket(struct vmbus_channel *channel, void *buffer, u32 bufferlen, u32 *buffer_actual_len, u64 *requestid); extern int vmbus_recvpacket_raw(struct vmbus_channel *channel, void *buffer, u32 bufferlen, u32 *buffer_actual_len, u64 *requestid); extern void vmbus_ontimer(unsigned long data); /* Base driver object */ struct hv_driver { const char *name; /* * A hvsock offer, which has a VMBUS_CHANNEL_TLNPI_PROVIDER_OFFER * channel flag, actually doesn't mean a synthetic device because the * offer's if_type/if_instance can change for every new hvsock * connection. * * However, to facilitate the notification of new-offer/rescind-offer * from vmbus driver to hvsock driver, we can handle hvsock offer as * a special vmbus device, and hence we need the below flag to * indicate if the driver is the hvsock driver or not: we need to * specially treat the hvosck offer & driver in vmbus_match(). */ bool hvsock; /* the device type supported by this driver */ guid_t dev_type; const struct hv_vmbus_device_id *id_table; struct device_driver driver; /* dynamic device GUID's */ struct { spinlock_t lock; struct list_head list; } dynids; int (*probe)(struct hv_device *, const struct hv_vmbus_device_id *); int (*remove)(struct hv_device *); void (*shutdown)(struct hv_device *); int (*suspend)(struct hv_device *); int (*resume)(struct hv_device *); }; /* Base device object */ struct hv_device { /* the device type id of this device */ guid_t dev_type; /* the device instance id of this device */ guid_t dev_instance; u16 vendor_id; u16 device_id; struct device device; char *driver_override; /* Driver name to force a match */ struct vmbus_channel *channel; struct kset *channels_kset; /* place holder to keep track of the dir for hv device in debugfs */ struct dentry *debug_dir; }; static inline struct hv_device *device_to_hv_device(struct device *d) { return container_of(d, struct hv_device, device); } static inline struct hv_driver *drv_to_hv_drv(struct device_driver *d) { return container_of(d, struct hv_driver, driver); } static inline void hv_set_drvdata(struct hv_device *dev, void *data) { dev_set_drvdata(&dev->device, data); } static inline void *hv_get_drvdata(struct hv_device *dev) { return dev_get_drvdata(&dev->device); } struct hv_ring_buffer_debug_info { u32 current_interrupt_mask; u32 current_read_index; u32 current_write_index; u32 bytes_avail_toread; u32 bytes_avail_towrite; }; int hv_ringbuffer_get_debuginfo(struct hv_ring_buffer_info *ring_info, struct hv_ring_buffer_debug_info *debug_info); bool hv_ringbuffer_spinlock_busy(struct vmbus_channel *channel); /* Vmbus interface */ #define vmbus_driver_register(driver) \ __vmbus_driver_register(driver, THIS_MODULE, KBUILD_MODNAME) int __must_check __vmbus_driver_register(struct hv_driver *hv_driver, struct module *owner, const char *mod_name); void vmbus_driver_unregister(struct hv_driver *hv_driver); void vmbus_hvsock_device_unregister(struct vmbus_channel *channel); int vmbus_allocate_mmio(struct resource **new, struct hv_device *device_obj, resource_size_t min, resource_size_t max, resource_size_t size, resource_size_t align, bool fb_overlap_ok); void vmbus_free_mmio(resource_size_t start, resource_size_t size); /* * GUID definitions of various offer types - services offered to the guest. */ /* * Network GUID * {f8615163-df3e-46c5-913f-f2d2f965ed0e} */ #define HV_NIC_GUID \ .guid = GUID_INIT(0xf8615163, 0xdf3e, 0x46c5, 0x91, 0x3f, \ 0xf2, 0xd2, 0xf9, 0x65, 0xed, 0x0e) /* * IDE GUID * {32412632-86cb-44a2-9b5c-50d1417354f5} */ #define HV_IDE_GUID \ .guid = GUID_INIT(0x32412632, 0x86cb, 0x44a2, 0x9b, 0x5c, \ 0x50, 0xd1, 0x41, 0x73, 0x54, 0xf5) /* * SCSI GUID * {ba6163d9-04a1-4d29-b605-72e2ffb1dc7f} */ #define HV_SCSI_GUID \ .guid = GUID_INIT(0xba6163d9, 0x04a1, 0x4d29, 0xb6, 0x05, \ 0x72, 0xe2, 0xff, 0xb1, 0xdc, 0x7f) /* * Shutdown GUID * {0e0b6031-5213-4934-818b-38d90ced39db} */ #define HV_SHUTDOWN_GUID \ .guid = GUID_INIT(0x0e0b6031, 0x5213, 0x4934, 0x81, 0x8b, \ 0x38, 0xd9, 0x0c, 0xed, 0x39, 0xdb) /* * Time Synch GUID * {9527E630-D0AE-497b-ADCE-E80AB0175CAF} */ #define HV_TS_GUID \ .guid = GUID_INIT(0x9527e630, 0xd0ae, 0x497b, 0xad, 0xce, \ 0xe8, 0x0a, 0xb0, 0x17, 0x5c, 0xaf) /* * Heartbeat GUID * {57164f39-9115-4e78-ab55-382f3bd5422d} */ #define HV_HEART_BEAT_GUID \ .guid = GUID_INIT(0x57164f39, 0x9115, 0x4e78, 0xab, 0x55, \ 0x38, 0x2f, 0x3b, 0xd5, 0x42, 0x2d) /* * KVP GUID * {a9a0f4e7-5a45-4d96-b827-8a841e8c03e6} */ #define HV_KVP_GUID \ .guid = GUID_INIT(0xa9a0f4e7, 0x5a45, 0x4d96, 0xb8, 0x27, \ 0x8a, 0x84, 0x1e, 0x8c, 0x03, 0xe6) /* * Dynamic memory GUID * {525074dc-8985-46e2-8057-a307dc18a502} */ #define HV_DM_GUID \ .guid = GUID_INIT(0x525074dc, 0x8985, 0x46e2, 0x80, 0x57, \ 0xa3, 0x07, 0xdc, 0x18, 0xa5, 0x02) /* * Mouse GUID * {cfa8b69e-5b4a-4cc0-b98b-8ba1a1f3f95a} */ #define HV_MOUSE_GUID \ .guid = GUID_INIT(0xcfa8b69e, 0x5b4a, 0x4cc0, 0xb9, 0x8b, \ 0x8b, 0xa1, 0xa1, 0xf3, 0xf9, 0x5a) /* * Keyboard GUID * {f912ad6d-2b17-48ea-bd65-f927a61c7684} */ #define HV_KBD_GUID \ .guid = GUID_INIT(0xf912ad6d, 0x2b17, 0x48ea, 0xbd, 0x65, \ 0xf9, 0x27, 0xa6, 0x1c, 0x76, 0x84) /* * VSS (Backup/Restore) GUID */ #define HV_VSS_GUID \ .guid = GUID_INIT(0x35fa2e29, 0xea23, 0x4236, 0x96, 0xae, \ 0x3a, 0x6e, 0xba, 0xcb, 0xa4, 0x40) /* * Synthetic Video GUID * {DA0A7802-E377-4aac-8E77-0558EB1073F8} */ #define HV_SYNTHVID_GUID \ .guid = GUID_INIT(0xda0a7802, 0xe377, 0x4aac, 0x8e, 0x77, \ 0x05, 0x58, 0xeb, 0x10, 0x73, 0xf8) /* * Synthetic FC GUID * {2f9bcc4a-0069-4af3-b76b-6fd0be528cda} */ #define HV_SYNTHFC_GUID \ .guid = GUID_INIT(0x2f9bcc4a, 0x0069, 0x4af3, 0xb7, 0x6b, \ 0x6f, 0xd0, 0xbe, 0x52, 0x8c, 0xda) /* * Guest File Copy Service * {34D14BE3-DEE4-41c8-9AE7-6B174977C192} */ #define HV_FCOPY_GUID \ .guid = GUID_INIT(0x34d14be3, 0xdee4, 0x41c8, 0x9a, 0xe7, \ 0x6b, 0x17, 0x49, 0x77, 0xc1, 0x92) /* * NetworkDirect. This is the guest RDMA service. * {8c2eaf3d-32a7-4b09-ab99-bd1f1c86b501} */ #define HV_ND_GUID \ .guid = GUID_INIT(0x8c2eaf3d, 0x32a7, 0x4b09, 0xab, 0x99, \ 0xbd, 0x1f, 0x1c, 0x86, 0xb5, 0x01) /* * PCI Express Pass Through * {44C4F61D-4444-4400-9D52-802E27EDE19F} */ #define HV_PCIE_GUID \ .guid = GUID_INIT(0x44c4f61d, 0x4444, 0x4400, 0x9d, 0x52, \ 0x80, 0x2e, 0x27, 0xed, 0xe1, 0x9f) /* * Linux doesn't support the 3 devices: the first two are for * Automatic Virtual Machine Activation, and the third is for * Remote Desktop Virtualization. * {f8e65716-3cb3-4a06-9a60-1889c5cccab5} * {3375baf4-9e15-4b30-b765-67acb10d607b} * {276aacf4-ac15-426c-98dd-7521ad3f01fe} */ #define HV_AVMA1_GUID \ .guid = GUID_INIT(0xf8e65716, 0x3cb3, 0x4a06, 0x9a, 0x60, \ 0x18, 0x89, 0xc5, 0xcc, 0xca, 0xb5) #define HV_AVMA2_GUID \ .guid = GUID_INIT(0x3375baf4, 0x9e15, 0x4b30, 0xb7, 0x65, \ 0x67, 0xac, 0xb1, 0x0d, 0x60, 0x7b) #define HV_RDV_GUID \ .guid = GUID_INIT(0x276aacf4, 0xac15, 0x426c, 0x98, 0xdd, \ 0x75, 0x21, 0xad, 0x3f, 0x01, 0xfe) /* * Common header for Hyper-V ICs */ #define ICMSGTYPE_NEGOTIATE 0 #define ICMSGTYPE_HEARTBEAT 1 #define ICMSGTYPE_KVPEXCHANGE 2 #define ICMSGTYPE_SHUTDOWN 3 #define ICMSGTYPE_TIMESYNC 4 #define ICMSGTYPE_VSS 5 #define ICMSGTYPE_FCOPY 7 #define ICMSGHDRFLAG_TRANSACTION 1 #define ICMSGHDRFLAG_REQUEST 2 #define ICMSGHDRFLAG_RESPONSE 4 /* * While we want to handle util services as regular devices, * there is only one instance of each of these services; so * we statically allocate the service specific state. */ struct hv_util_service { u8 *recv_buffer; void *channel; void (*util_cb)(void *); int (*util_init)(struct hv_util_service *); void (*util_deinit)(void); int (*util_pre_suspend)(void); int (*util_pre_resume)(void); }; struct vmbuspipe_hdr { u32 flags; u32 msgsize; } __packed; struct ic_version { u16 major; u16 minor; } __packed; struct icmsg_hdr { struct ic_version icverframe; u16 icmsgtype; struct ic_version icvermsg; u16 icmsgsize; u32 status; u8 ictransaction_id; u8 icflags; u8 reserved[2]; } __packed; #define IC_VERSION_NEGOTIATION_MAX_VER_COUNT 100 #define ICMSG_HDR (sizeof(struct vmbuspipe_hdr) + sizeof(struct icmsg_hdr)) #define ICMSG_NEGOTIATE_PKT_SIZE(icframe_vercnt, icmsg_vercnt) \ (ICMSG_HDR + sizeof(struct icmsg_negotiate) + \ (((icframe_vercnt) + (icmsg_vercnt)) * sizeof(struct ic_version))) struct icmsg_negotiate { u16 icframe_vercnt; u16 icmsg_vercnt; u32 reserved; struct ic_version icversion_data[]; /* any size array */ } __packed; struct shutdown_msg_data { u32 reason_code; u32 timeout_seconds; u32 flags; u8 display_message[2048]; } __packed; struct heartbeat_msg_data { u64 seq_num; u32 reserved[8]; } __packed; /* Time Sync IC defs */ #define ICTIMESYNCFLAG_PROBE 0 #define ICTIMESYNCFLAG_SYNC 1 #define ICTIMESYNCFLAG_SAMPLE 2 #ifdef __x86_64__ #define WLTIMEDELTA 116444736000000000L /* in 100ns unit */ #else #define WLTIMEDELTA 116444736000000000LL #endif struct ictimesync_data { u64 parenttime; u64 childtime; u64 roundtriptime; u8 flags; } __packed; struct ictimesync_ref_data { u64 parenttime; u64 vmreferencetime; u8 flags; char leapflags; char stratum; u8 reserved[3]; } __packed; struct hyperv_service_callback { u8 msg_type; char *log_msg; guid_t data; struct vmbus_channel *channel; void (*callback)(void *context); }; #define MAX_SRV_VER 0x7ffffff extern bool vmbus_prep_negotiate_resp(struct icmsg_hdr *icmsghdrp, u8 *buf, u32 buflen, const int *fw_version, int fw_vercnt, const int *srv_version, int srv_vercnt, int *nego_fw_version, int *nego_srv_version); void hv_process_channel_removal(struct vmbus_channel *channel); void vmbus_setevent(struct vmbus_channel *channel); /* * Negotiated version with the Host. */ extern __u32 vmbus_proto_version; int vmbus_send_tl_connect_request(const guid_t *shv_guest_servie_id, const guid_t *shv_host_servie_id); int vmbus_send_modifychannel(struct vmbus_channel *channel, u32 target_vp); void vmbus_set_event(struct vmbus_channel *channel); /* Get the start of the ring buffer. */ static inline void * hv_get_ring_buffer(const struct hv_ring_buffer_info *ring_info) { return ring_info->ring_buffer->buffer; } /* * Mask off host interrupt callback notifications */ static inline void hv_begin_read(struct hv_ring_buffer_info *rbi) { rbi->ring_buffer->interrupt_mask = 1; /* make sure mask update is not reordered */ virt_mb(); } /* * Re-enable host callback and return number of outstanding bytes */ static inline u32 hv_end_read(struct hv_ring_buffer_info *rbi) { rbi->ring_buffer->interrupt_mask = 0; /* make sure mask update is not reordered */ virt_mb(); /* * Now check to see if the ring buffer is still empty. * If it is not, we raced and we need to process new * incoming messages. */ return hv_get_bytes_to_read(rbi); } /* * An API to support in-place processing of incoming VMBUS packets. */ /* Get data payload associated with descriptor */ static inline void *hv_pkt_data(const struct vmpacket_descriptor *desc) { return (void *)((unsigned long)desc + (desc->offset8 << 3)); } /* Get data size associated with descriptor */ static inline u32 hv_pkt_datalen(const struct vmpacket_descriptor *desc) { return (desc->len8 << 3) - (desc->offset8 << 3); } struct vmpacket_descriptor * hv_pkt_iter_first_raw(struct vmbus_channel *channel); struct vmpacket_descriptor * hv_pkt_iter_first(struct vmbus_channel *channel); struct vmpacket_descriptor * __hv_pkt_iter_next(struct vmbus_channel *channel, const struct vmpacket_descriptor *pkt, bool copy); void hv_pkt_iter_close(struct vmbus_channel *channel); static inline struct vmpacket_descriptor * hv_pkt_iter_next_pkt(struct vmbus_channel *channel, const struct vmpacket_descriptor *pkt, bool copy) { struct vmpacket_descriptor *nxt; nxt = __hv_pkt_iter_next(channel, pkt, copy); if (!nxt) hv_pkt_iter_close(channel); return nxt; } /* * Get next packet descriptor without copying it out of the ring buffer * If at end of list, return NULL and update host. */ static inline struct vmpacket_descriptor * hv_pkt_iter_next_raw(struct vmbus_channel *channel, const struct vmpacket_descriptor *pkt) { return hv_pkt_iter_next_pkt(channel, pkt, false); } /* * Get next packet descriptor from iterator * If at end of list, return NULL and update host. */ static inline struct vmpacket_descriptor * hv_pkt_iter_next(struct vmbus_channel *channel, const struct vmpacket_descriptor *pkt) { return hv_pkt_iter_next_pkt(channel, pkt, true); } #define foreach_vmbus_pkt(pkt, channel) \ for (pkt = hv_pkt_iter_first(channel); pkt; \ pkt = hv_pkt_iter_next(channel, pkt)) /* * Interface for passing data between SR-IOV PF and VF drivers. The VF driver * sends requests to read and write blocks. Each block must be 128 bytes or * smaller. Optionally, the VF driver can register a callback function which * will be invoked when the host says that one or more of the first 64 block * IDs is "invalid" which means that the VF driver should reread them. */ #define HV_CONFIG_BLOCK_SIZE_MAX 128 int hyperv_read_cfg_blk(struct pci_dev *dev, void *buf, unsigned int buf_len, unsigned int block_id, unsigned int *bytes_returned); int hyperv_write_cfg_blk(struct pci_dev *dev, void *buf, unsigned int len, unsigned int block_id); int hyperv_reg_block_invalidate(struct pci_dev *dev, void *context, void (*block_invalidate)(void *context, u64 block_mask)); struct hyperv_pci_block_ops { int (*read_block)(struct pci_dev *dev, void *buf, unsigned int buf_len, unsigned int block_id, unsigned int *bytes_returned); int (*write_block)(struct pci_dev *dev, void *buf, unsigned int len, unsigned int block_id); int (*reg_blk_invalidate)(struct pci_dev *dev, void *context, void (*block_invalidate)(void *context, u64 block_mask)); }; extern struct hyperv_pci_block_ops hvpci_block_ops; static inline unsigned long virt_to_hvpfn(void *addr) { phys_addr_t paddr; if (is_vmalloc_addr(addr)) paddr = page_to_phys(vmalloc_to_page(addr)) + offset_in_page(addr); else paddr = __pa(addr); return paddr >> HV_HYP_PAGE_SHIFT; } #define NR_HV_HYP_PAGES_IN_PAGE (PAGE_SIZE / HV_HYP_PAGE_SIZE) #define offset_in_hvpage(ptr) ((unsigned long)(ptr) & ~HV_HYP_PAGE_MASK) #define HVPFN_UP(x) (((x) + HV_HYP_PAGE_SIZE-1) >> HV_HYP_PAGE_SHIFT) #define HVPFN_DOWN(x) ((x) >> HV_HYP_PAGE_SHIFT) #define page_to_hvpfn(page) (page_to_pfn(page) * NR_HV_HYP_PAGES_IN_PAGE) #endif /* _HYPERV_H */