Index: head/sys/dev/hyperv/include/hyperv.h =================================================================== --- head/sys/dev/hyperv/include/hyperv.h (revision 302632) +++ head/sys/dev/hyperv/include/hyperv.h (revision 302633) @@ -1,729 +1,732 @@ /*- * Copyright (c) 2009-2012,2016 Microsoft Corp. * Copyright (c) 2012 NetApp Inc. * Copyright (c) 2012 Citrix Inc. * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice unmodified, this list of conditions, and the following * disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. * * $FreeBSD$ */ /** * HyperV definitions for messages that are sent between instances of the * Channel Management Library in separate partitions, or in some cases, * back to itself. */ #ifndef __HYPERV_H__ #define __HYPERV_H__ #include #include #include #include #include #include #include #include #include #include #include #include +#include #include #include #include #include #include #include typedef uint8_t hv_bool_uint8_t; #define HV_S_OK 0x00000000 #define HV_E_FAIL 0x80004005 #define HV_ERROR_NOT_SUPPORTED 0x80070032 #define HV_ERROR_MACHINE_LOCKED 0x800704F7 /* * VMBUS version is 32 bit, upper 16 bit for major_number and lower * 16 bit for minor_number. * * 0.13 -- Windows Server 2008 * 1.1 -- Windows 7 * 2.4 -- Windows 8 * 3.0 -- Windows 8.1 */ #define VMBUS_VERSION_WS2008 ((0 << 16) | (13)) #define VMBUS_VERSION_WIN7 ((1 << 16) | (1)) #define VMBUS_VERSION_WIN8 ((2 << 16) | (4)) #define VMBUS_VERSION_WIN8_1 ((3 << 16) | (0)) #define VMBUS_VERSION_MAJOR(ver) (((uint32_t)(ver)) >> 16) #define VMBUS_VERSION_MINOR(ver) (((uint32_t)(ver)) & 0xffff) /* * Make maximum size of pipe payload of 16K */ #define HV_MAX_PIPE_DATA_PAYLOAD (sizeof(BYTE) * 16384) /* * Define pipe_mode values */ #define HV_VMBUS_PIPE_TYPE_BYTE 0x00000000 #define HV_VMBUS_PIPE_TYPE_MESSAGE 0x00000004 /* * The size of the user defined data buffer for non-pipe offers */ #define HV_MAX_USER_DEFINED_BYTES 120 /* * The size of the user defined data buffer for pipe offers */ #define HV_MAX_PIPE_USER_DEFINED_BYTES 116 #define HV_MAX_PAGE_BUFFER_COUNT 32 #define HV_MAX_MULTIPAGE_BUFFER_COUNT 32 #define HV_ALIGN_UP(value, align) \ (((value) & (align-1)) ? \ (((value) + (align-1)) & ~(align-1) ) : (value)) #define HV_ALIGN_DOWN(value, align) ( (value) & ~(align-1) ) #define HV_NUM_PAGES_SPANNED(addr, len) \ ((HV_ALIGN_UP(addr+len, PAGE_SIZE) - \ HV_ALIGN_DOWN(addr, PAGE_SIZE)) >> PAGE_SHIFT ) typedef struct hv_guid { uint8_t data[16]; } __packed hv_guid; #define HYPERV_GUID_STRLEN 40 int hyperv_guid2str(const struct hv_guid *, char *, size_t); #define HV_NIC_GUID \ .data = {0x63, 0x51, 0x61, 0xF8, 0x3E, 0xDF, 0xc5, 0x46, \ 0x91, 0x3F, 0xF2, 0xD2, 0xF9, 0x65, 0xED, 0x0E} #define HV_IDE_GUID \ .data = {0x32, 0x26, 0x41, 0x32, 0xcb, 0x86, 0xa2, 0x44, \ 0x9b, 0x5c, 0x50, 0xd1, 0x41, 0x73, 0x54, 0xf5} #define HV_SCSI_GUID \ .data = {0xd9, 0x63, 0x61, 0xba, 0xa1, 0x04, 0x29, 0x4d, \ 0xb6, 0x05, 0x72, 0xe2, 0xff, 0xb1, 0xdc, 0x7f} /* * At the center of the Channel Management library is * the Channel Offer. This struct contains the * fundamental information about an offer. */ typedef struct hv_vmbus_channel_offer { hv_guid interface_type; hv_guid interface_instance; uint64_t interrupt_latency_in_100ns_units; uint32_t interface_revision; uint32_t server_context_area_size; /* in bytes */ uint16_t channel_flags; uint16_t mmio_megabytes; /* in bytes * 1024 * 1024 */ union { /* * Non-pipes: The user has HV_MAX_USER_DEFINED_BYTES bytes. */ struct { uint8_t user_defined[HV_MAX_USER_DEFINED_BYTES]; } __packed standard; /* * Pipes: The following structure is an integrated pipe protocol, which * is implemented on top of standard user-defined data. pipe * clients have HV_MAX_PIPE_USER_DEFINED_BYTES left for their * own use. */ struct { uint32_t pipe_mode; uint8_t user_defined[HV_MAX_PIPE_USER_DEFINED_BYTES]; } __packed pipe; } u; /* * Sub_channel_index, newly added in Win8. */ uint16_t sub_channel_index; uint16_t padding; } __packed hv_vmbus_channel_offer; typedef struct { uint16_t type; uint16_t data_offset8; uint16_t length8; uint16_t flags; uint64_t transaction_id; } __packed hv_vm_packet_descriptor; typedef uint32_t hv_previous_packet_offset; typedef struct { hv_previous_packet_offset previous_packet_start_offset; hv_vm_packet_descriptor descriptor; } __packed hv_vm_packet_header; typedef struct { uint32_t byte_count; uint32_t byte_offset; } __packed hv_vm_transfer_page; typedef struct { hv_vm_packet_descriptor d; uint16_t transfer_page_set_id; hv_bool_uint8_t sender_owns_set; uint8_t reserved; uint32_t range_count; hv_vm_transfer_page ranges[1]; } __packed hv_vm_transfer_page_packet_header; typedef struct { hv_vm_packet_descriptor d; uint32_t gpadl; uint32_t reserved; } __packed hv_vm_gpadl_packet_header; typedef struct { hv_vm_packet_descriptor d; uint32_t gpadl; uint16_t transfer_page_set_id; uint16_t reserved; } __packed hv_vm_add_remove_transfer_page_set; /* * This structure defines a range in guest * physical space that can be made * to look virtually contiguous. */ typedef struct { uint32_t byte_count; uint32_t byte_offset; uint64_t pfn_array[0]; } __packed hv_gpa_range; /* * 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. */ typedef struct { hv_vm_packet_descriptor d; uint32_t gpadl; uint32_t range_count; hv_gpa_range range[1]; } __packed hv_vm_establish_gpadl; /* * 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. */ typedef struct { hv_vm_packet_descriptor d; uint32_t gpadl; /* for alignment to a 8-byte boundary */ uint32_t reserved; } __packed hv_vm_teardown_gpadl; /* * This is the format for a GPA-Direct packet, which contains a set of GPA * ranges, in addition to commands and/or data. */ typedef struct { hv_vm_packet_descriptor d; uint32_t reserved; uint32_t range_count; hv_gpa_range range[1]; } __packed hv_vm_data_gpa_direct; /* * This is the format for a Additional data Packet. */ typedef struct { hv_vm_packet_descriptor d; uint64_t total_bytes; uint32_t byte_offset; uint32_t byte_count; uint8_t data[1]; } __packed hv_vm_additional_data; typedef union { hv_vm_packet_descriptor simple_header; hv_vm_transfer_page_packet_header transfer_page_header; hv_vm_gpadl_packet_header gpadl_header; hv_vm_add_remove_transfer_page_set add_remove_transfer_page_header; hv_vm_establish_gpadl establish_gpadl_header; hv_vm_teardown_gpadl teardown_gpadl_header; hv_vm_data_gpa_direct data_gpa_direct_header; } __packed hv_vm_packet_largest_possible_header; typedef enum { HV_VMBUS_PACKET_TYPE_INVALID = 0x0, HV_VMBUS_PACKET_TYPES_SYNCH = 0x1, HV_VMBUS_PACKET_TYPE_ADD_TRANSFER_PAGE_SET = 0x2, HV_VMBUS_PACKET_TYPE_REMOVE_TRANSFER_PAGE_SET = 0x3, HV_VMBUS_PACKET_TYPE_ESTABLISH_GPADL = 0x4, HV_VMBUS_PACKET_TYPE_TEAR_DOWN_GPADL = 0x5, HV_VMBUS_PACKET_TYPE_DATA_IN_BAND = 0x6, HV_VMBUS_PACKET_TYPE_DATA_USING_TRANSFER_PAGES = 0x7, HV_VMBUS_PACKET_TYPE_DATA_USING_GPADL = 0x8, HV_VMBUS_PACKET_TYPE_DATA_USING_GPA_DIRECT = 0x9, HV_VMBUS_PACKET_TYPE_CANCEL_REQUEST = 0xa, HV_VMBUS_PACKET_TYPE_COMPLETION = 0xb, HV_VMBUS_PACKET_TYPE_DATA_USING_ADDITIONAL_PACKETS = 0xc, HV_VMBUS_PACKET_TYPE_ADDITIONAL_DATA = 0xd } hv_vmbus_packet_type; #define HV_VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED 1 /* * Version 1 messages */ typedef enum { HV_CHANNEL_MESSAGE_INVALID = 0, HV_CHANNEL_MESSAGE_OFFER_CHANNEL = 1, HV_CHANNEL_MESSAGE_RESCIND_CHANNEL_OFFER = 2, HV_CHANNEL_MESSAGE_REQUEST_OFFERS = 3, HV_CHANNEL_MESSAGE_ALL_OFFERS_DELIVERED = 4, HV_CHANNEL_MESSAGE_OPEN_CHANNEL = 5, HV_CHANNEL_MESSAGE_OPEN_CHANNEL_RESULT = 6, HV_CHANNEL_MESSAGE_CLOSE_CHANNEL = 7, HV_CHANNEL_MESSAGEL_GPADL_HEADER = 8, HV_CHANNEL_MESSAGE_GPADL_BODY = 9, HV_CHANNEL_MESSAGE_GPADL_CREATED = 10, HV_CHANNEL_MESSAGE_GPADL_TEARDOWN = 11, HV_CHANNEL_MESSAGE_GPADL_TORNDOWN = 12, HV_CHANNEL_MESSAGE_REL_ID_RELEASED = 13, HV_CHANNEL_MESSAGE_INITIATED_CONTACT = 14, HV_CHANNEL_MESSAGE_VERSION_RESPONSE = 15, HV_CHANNEL_MESSAGE_UNLOAD = 16, HV_CHANNEL_MESSAGE_COUNT } hv_vmbus_channel_msg_type; typedef struct { hv_vmbus_channel_msg_type message_type; uint32_t padding; } __packed hv_vmbus_channel_msg_header; /* * Query VMBus Version parameters */ typedef struct { hv_vmbus_channel_msg_header header; uint32_t version; } __packed hv_vmbus_channel_query_vmbus_version; /* * Channel Offer parameters */ typedef struct { hv_vmbus_channel_msg_header header; hv_vmbus_channel_offer offer; uint32_t child_rel_id; uint8_t monitor_id; /* * This field has been split into a bit field on Win7 * and higher. */ uint8_t monitor_allocated:1; uint8_t reserved:7; /* * Following fields were added in win7 and higher. * Make sure to check the version before accessing these fields. * * 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 used in signaling the host. */ uint16_t is_dedicated_interrupt:1; uint16_t reserved1:15; uint32_t connection_id; } __packed hv_vmbus_channel_offer_channel; /* * Rescind Offer parameters */ typedef struct { hv_vmbus_channel_msg_header header; uint32_t child_rel_id; } __packed hv_vmbus_channel_rescind_offer; typedef struct { hv_vmbus_channel_msg_header header; uint32_t child_rel_id; } __packed hv_vmbus_channel_relid_released; #define HW_MACADDR_LEN 6 enum { HV_VMBUS_IVAR_TYPE, HV_VMBUS_IVAR_INSTANCE, HV_VMBUS_IVAR_NODE, HV_VMBUS_IVAR_DEVCTX }; #define HV_VMBUS_ACCESSOR(var, ivar, type) \ __BUS_ACCESSOR(vmbus, var, HV_VMBUS, ivar, type) HV_VMBUS_ACCESSOR(type, TYPE, const char *) HV_VMBUS_ACCESSOR(devctx, DEVCTX, struct hv_device *) /* * Common defines for Hyper-V ICs */ #define HV_ICMSGTYPE_NEGOTIATE 0 #define HV_ICMSGTYPE_HEARTBEAT 1 #define HV_ICMSGTYPE_KVPEXCHANGE 2 #define HV_ICMSGTYPE_SHUTDOWN 3 #define HV_ICMSGTYPE_TIMESYNC 4 #define HV_ICMSGTYPE_VSS 5 #define HV_ICMSGHDRFLAG_TRANSACTION 1 #define HV_ICMSGHDRFLAG_REQUEST 2 #define HV_ICMSGHDRFLAG_RESPONSE 4 typedef struct hv_vmbus_pipe_hdr { uint32_t flags; uint32_t msgsize; } __packed hv_vmbus_pipe_hdr; typedef struct hv_vmbus_ic_version { uint16_t major; uint16_t minor; } __packed hv_vmbus_ic_version; typedef struct hv_vmbus_icmsg_hdr { hv_vmbus_ic_version icverframe; uint16_t icmsgtype; hv_vmbus_ic_version icvermsg; uint16_t icmsgsize; uint32_t status; uint8_t ictransaction_id; uint8_t icflags; uint8_t reserved[2]; } __packed hv_vmbus_icmsg_hdr; typedef struct hv_vmbus_icmsg_negotiate { uint16_t icframe_vercnt; uint16_t icmsg_vercnt; uint32_t reserved; hv_vmbus_ic_version icversion_data[1]; /* any size array */ } __packed hv_vmbus_icmsg_negotiate; typedef struct hv_vmbus_shutdown_msg_data { uint32_t reason_code; uint32_t timeout_seconds; uint32_t flags; uint8_t display_message[2048]; } __packed hv_vmbus_shutdown_msg_data; typedef struct hv_vmbus_heartbeat_msg_data { uint64_t seq_num; uint32_t reserved[8]; } __packed hv_vmbus_heartbeat_msg_data; typedef struct { /* * offset in bytes from the start of ring data below */ volatile uint32_t write_index; /* * offset in bytes from the start of ring data below */ volatile uint32_t read_index; /* * NOTE: The interrupt_mask field is used only for channels, but * vmbus connection also uses this data structure */ volatile uint32_t interrupt_mask; /* pad it to PAGE_SIZE so that data starts on a page */ uint8_t reserved[4084]; /* * WARNING: Ring data starts here + ring_data_start_offset * !!! DO NOT place any fields below this !!! */ uint8_t buffer[0]; /* doubles as interrupt mask */ } __packed hv_vmbus_ring_buffer; typedef struct { int length; int offset; uint64_t pfn; } __packed hv_vmbus_page_buffer; typedef struct { int length; int offset; uint64_t pfn_array[HV_MAX_MULTIPAGE_BUFFER_COUNT]; } __packed hv_vmbus_multipage_buffer; typedef struct { hv_vmbus_ring_buffer* ring_buffer; uint32_t ring_size; /* Include the shared header */ struct mtx ring_lock; uint32_t ring_data_size; /* ring_size */ uint32_t ring_data_start_offset; } hv_vmbus_ring_buffer_info; typedef void (*hv_vmbus_pfn_channel_callback)(void *context); typedef enum { HV_CHANNEL_OFFER_STATE, HV_CHANNEL_OPENING_STATE, HV_CHANNEL_OPEN_STATE, HV_CHANNEL_OPENED_STATE, HV_CHANNEL_CLOSING_NONDESTRUCTIVE_STATE, } hv_vmbus_channel_state; /* * Connection identifier type */ typedef union { uint32_t as_uint32_t; struct { uint32_t id:24; uint32_t reserved:8; } u; } __packed hv_vmbus_connection_id; typedef struct hv_vmbus_channel { struct hv_device* device; struct vmbus_softc *vmbus_sc; hv_vmbus_channel_state state; hv_vmbus_channel_offer_channel offer_msg; /* * These are based on the offer_msg.monitor_id. * Save it here for easy access. */ uint8_t monitor_group; uint8_t monitor_bit; uint32_t ring_buffer_gpadl_handle; /* * Allocated memory for ring buffer */ void* ring_buffer_pages; unsigned long ring_buffer_size; uint32_t ring_buffer_page_count; /* * send to parent */ hv_vmbus_ring_buffer_info outbound; /* * receive from parent */ hv_vmbus_ring_buffer_info inbound; struct taskqueue * rxq; struct task channel_task; hv_vmbus_pfn_channel_callback on_channel_callback; void* channel_callback_context; /* * If batched_reading is set to "true", mask the interrupt * and read until the channel is empty. * If batched_reading is set to "false", the channel is not * going to perform batched reading. * * Batched reading is enabled by default; specific * drivers that don't want this behavior can turn it off. */ boolean_t batched_reading; boolean_t is_dedicated_interrupt; struct hypercall_sigevt_in *ch_sigevt; struct hyperv_dma ch_sigevt_dma; /* * From Win8, this field specifies the target virtual process * on which to deliver the interrupt from the host to guest. * Before Win8, all channel interrupts would only be * delivered on cpu 0. Setting this value to 0 would preserve * the earlier behavior. */ uint32_t target_vcpu; /* The corresponding CPUID in the guest */ uint32_t target_cpu; /* * Support for multi-channels. * The initial offer is considered the primary channel and this * offer message will indicate if the host supports multi-channels. * The guest is free to ask for multi-channels to be offerred and can * open these multi-channels as a normal "primary" channel. However, * all multi-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. */ struct mtx sc_lock; /* * Link list of all the multi-channels if this is a primary channel */ TAILQ_HEAD(, hv_vmbus_channel) sc_list_anchor; TAILQ_ENTRY(hv_vmbus_channel) sc_list_entry; int subchan_cnt; /* * The primary channel this sub-channle belongs to. * This will be NULL for the primary channel. */ struct hv_vmbus_channel *primary_channel; /* * Driver private data */ void *hv_chan_priv1; void *hv_chan_priv2; void *hv_chan_priv3; struct task ch_detach_task; TAILQ_ENTRY(hv_vmbus_channel) ch_link; + + struct sysctl_ctx_list ch_sysctl_ctx; } hv_vmbus_channel; #define HV_VMBUS_CHAN_ISPRIMARY(chan) ((chan)->primary_channel == NULL) static inline void hv_set_channel_read_state(hv_vmbus_channel* channel, boolean_t state) { channel->batched_reading = state; } typedef struct hv_device { hv_guid class_id; hv_guid device_id; device_t device; hv_vmbus_channel* channel; } hv_device; int hv_vmbus_channel_recv_packet( hv_vmbus_channel* channel, void* buffer, uint32_t buffer_len, uint32_t* buffer_actual_len, uint64_t* request_id); int hv_vmbus_channel_recv_packet_raw( hv_vmbus_channel* channel, void* buffer, uint32_t buffer_len, uint32_t* buffer_actual_len, uint64_t* request_id); int hv_vmbus_channel_open( hv_vmbus_channel* channel, uint32_t send_ring_buffer_size, uint32_t recv_ring_buffer_size, void* user_data, uint32_t user_data_len, hv_vmbus_pfn_channel_callback pfn_on_channel_callback, void* context); void hv_vmbus_channel_close(hv_vmbus_channel *channel); int hv_vmbus_channel_send_packet( hv_vmbus_channel* channel, void* buffer, uint32_t buffer_len, uint64_t request_id, hv_vmbus_packet_type type, uint32_t flags); int hv_vmbus_channel_send_packet_pagebuffer( hv_vmbus_channel* channel, hv_vmbus_page_buffer page_buffers[], uint32_t page_count, void* buffer, uint32_t buffer_len, uint64_t request_id); int hv_vmbus_channel_send_packet_multipagebuffer( hv_vmbus_channel* channel, hv_vmbus_multipage_buffer* multi_page_buffer, void* buffer, uint32_t buffer_len, uint64_t request_id); int hv_vmbus_channel_establish_gpadl( hv_vmbus_channel* channel, /* must be phys and virt contiguous */ void* contig_buffer, /* page-size multiple */ uint32_t size, uint32_t* gpadl_handle); int hv_vmbus_channel_teardown_gpdal( hv_vmbus_channel* channel, uint32_t gpadl_handle); struct hv_vmbus_channel* vmbus_select_outgoing_channel(struct hv_vmbus_channel *promary); void vmbus_channel_cpu_set(struct hv_vmbus_channel *chan, int cpu); void vmbus_channel_cpu_rr(struct hv_vmbus_channel *chan); struct hv_vmbus_channel ** vmbus_get_subchan(struct hv_vmbus_channel *pri_chan, int subchan_cnt); void vmbus_rel_subchan(struct hv_vmbus_channel **subchan, int subchan_cnt); /** * @brief Get physical address from virtual */ static inline unsigned long hv_get_phys_addr(void *virt) { unsigned long ret; ret = (vtophys(virt) | ((vm_offset_t) virt & PAGE_MASK)); return (ret); } #endif /* __HYPERV_H__ */ Index: head/sys/dev/hyperv/vmbus/hv_channel.c =================================================================== --- head/sys/dev/hyperv/vmbus/hv_channel.c (revision 302632) +++ head/sys/dev/hyperv/vmbus/hv_channel.c (revision 302633) @@ -1,883 +1,885 @@ /*- * Copyright (c) 2009-2012,2016 Microsoft Corp. * Copyright (c) 2012 NetApp Inc. * Copyright (c) 2012 Citrix Inc. * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice unmodified, this list of conditions, and the following * disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */ #include __FBSDID("$FreeBSD$"); #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include static void vmbus_channel_set_event(hv_vmbus_channel* channel); static void VmbusProcessChannelEvent(void* channel, int pending); /** * @brief Trigger an event notification on the specified channel */ static void vmbus_channel_set_event(hv_vmbus_channel *channel) { struct vmbus_softc *sc = channel->vmbus_sc; uint32_t chanid = channel->offer_msg.child_rel_id; atomic_set_long(&sc->vmbus_tx_evtflags[chanid >> VMBUS_EVTFLAG_SHIFT], 1UL << (chanid & VMBUS_EVTFLAG_MASK)); if (channel->offer_msg.monitor_allocated) { hv_vmbus_monitor_page *monitor_page; monitor_page = sc->vmbus_mnf2; synch_set_bit(channel->monitor_bit, (uint32_t *)&monitor_page-> trigger_group[channel->monitor_group].u.pending); } else { hypercall_signal_event(channel->ch_sigevt_dma.hv_paddr); } } static int vmbus_channel_sysctl_monalloc(SYSCTL_HANDLER_ARGS) { struct hv_vmbus_channel *chan = arg1; int alloc = 0; if (chan->offer_msg.monitor_allocated) alloc = 1; return sysctl_handle_int(oidp, &alloc, 0, req); } static void vmbus_channel_sysctl_create(hv_vmbus_channel* channel) { device_t dev; struct sysctl_oid *devch_sysctl; struct sysctl_oid *devch_id_sysctl, *devch_sub_sysctl; struct sysctl_oid *devch_id_in_sysctl, *devch_id_out_sysctl; struct sysctl_ctx_list *ctx; uint32_t ch_id; uint16_t sub_ch_id; char name[16]; hv_vmbus_channel* primary_ch = channel->primary_channel; if (primary_ch == NULL) { dev = channel->device->device; ch_id = channel->offer_msg.child_rel_id; } else { dev = primary_ch->device->device; ch_id = primary_ch->offer_msg.child_rel_id; sub_ch_id = channel->offer_msg.offer.sub_channel_index; } - ctx = device_get_sysctl_ctx(dev); + ctx = &channel->ch_sysctl_ctx; + sysctl_ctx_init(ctx); /* This creates dev.DEVNAME.DEVUNIT.channel tree */ devch_sysctl = SYSCTL_ADD_NODE(ctx, SYSCTL_CHILDREN(device_get_sysctl_tree(dev)), OID_AUTO, "channel", CTLFLAG_RD | CTLFLAG_MPSAFE, 0, ""); /* This creates dev.DEVNAME.DEVUNIT.channel.CHANID tree */ snprintf(name, sizeof(name), "%d", ch_id); devch_id_sysctl = SYSCTL_ADD_NODE(ctx, SYSCTL_CHILDREN(devch_sysctl), OID_AUTO, name, CTLFLAG_RD | CTLFLAG_MPSAFE, 0, ""); if (primary_ch != NULL) { devch_sub_sysctl = SYSCTL_ADD_NODE(ctx, SYSCTL_CHILDREN(devch_id_sysctl), OID_AUTO, "sub", CTLFLAG_RD | CTLFLAG_MPSAFE, 0, ""); snprintf(name, sizeof(name), "%d", sub_ch_id); devch_id_sysctl = SYSCTL_ADD_NODE(ctx, SYSCTL_CHILDREN(devch_sub_sysctl), OID_AUTO, name, CTLFLAG_RD | CTLFLAG_MPSAFE, 0, ""); SYSCTL_ADD_UINT(ctx, SYSCTL_CHILDREN(devch_id_sysctl), OID_AUTO, "chanid", CTLFLAG_RD, &channel->offer_msg.child_rel_id, 0, "channel id"); } SYSCTL_ADD_UINT(ctx, SYSCTL_CHILDREN(devch_id_sysctl), OID_AUTO, "cpu", CTLFLAG_RD, &channel->target_cpu, 0, "owner CPU id"); SYSCTL_ADD_PROC(ctx, SYSCTL_CHILDREN(devch_id_sysctl), OID_AUTO, "monitor_allocated", CTLTYPE_INT | CTLFLAG_RD | CTLFLAG_MPSAFE, channel, 0, vmbus_channel_sysctl_monalloc, "I", "is monitor allocated to this channel"); devch_id_in_sysctl = SYSCTL_ADD_NODE(ctx, SYSCTL_CHILDREN(devch_id_sysctl), OID_AUTO, "in", CTLFLAG_RD | CTLFLAG_MPSAFE, 0, ""); devch_id_out_sysctl = SYSCTL_ADD_NODE(ctx, SYSCTL_CHILDREN(devch_id_sysctl), OID_AUTO, "out", CTLFLAG_RD | CTLFLAG_MPSAFE, 0, ""); hv_ring_buffer_stat(ctx, SYSCTL_CHILDREN(devch_id_in_sysctl), &(channel->inbound), "inbound ring buffer stats"); hv_ring_buffer_stat(ctx, SYSCTL_CHILDREN(devch_id_out_sysctl), &(channel->outbound), "outbound ring buffer stats"); } /** * @brief Open the specified channel */ int hv_vmbus_channel_open( hv_vmbus_channel* new_channel, uint32_t send_ring_buffer_size, uint32_t recv_ring_buffer_size, void* user_data, uint32_t user_data_len, hv_vmbus_pfn_channel_callback pfn_on_channel_callback, void* context) { struct vmbus_softc *sc = new_channel->vmbus_sc; const struct vmbus_chanmsg_chopen_resp *resp; const struct vmbus_message *msg; struct vmbus_chanmsg_chopen *req; struct vmbus_msghc *mh; uint32_t status; int ret = 0; void *in, *out; if (user_data_len > VMBUS_CHANMSG_CHOPEN_UDATA_SIZE) { device_printf(sc->vmbus_dev, "invalid udata len %u for chan%u\n", user_data_len, new_channel->offer_msg.child_rel_id); return EINVAL; } mtx_lock(&new_channel->sc_lock); if (new_channel->state == HV_CHANNEL_OPEN_STATE) { new_channel->state = HV_CHANNEL_OPENING_STATE; } else { mtx_unlock(&new_channel->sc_lock); if(bootverbose) printf("VMBUS: Trying to open channel <%p> which in " "%d state.\n", new_channel, new_channel->state); return (EINVAL); } mtx_unlock(&new_channel->sc_lock); new_channel->on_channel_callback = pfn_on_channel_callback; new_channel->channel_callback_context = context; vmbus_on_channel_open(new_channel); new_channel->rxq = VMBUS_PCPU_GET(new_channel->vmbus_sc, event_tq, new_channel->target_cpu); TASK_INIT(&new_channel->channel_task, 0, VmbusProcessChannelEvent, new_channel); /* Allocate the ring buffer */ out = contigmalloc((send_ring_buffer_size + recv_ring_buffer_size), M_DEVBUF, M_ZERO, 0UL, BUS_SPACE_MAXADDR, PAGE_SIZE, 0); KASSERT(out != NULL, ("Error VMBUS: contigmalloc failed to allocate Ring Buffer!")); if (out == NULL) return (ENOMEM); in = ((uint8_t *) out + send_ring_buffer_size); new_channel->ring_buffer_pages = out; new_channel->ring_buffer_page_count = (send_ring_buffer_size + recv_ring_buffer_size) >> PAGE_SHIFT; new_channel->ring_buffer_size = send_ring_buffer_size + recv_ring_buffer_size; hv_vmbus_ring_buffer_init( &new_channel->outbound, out, send_ring_buffer_size); hv_vmbus_ring_buffer_init( &new_channel->inbound, in, recv_ring_buffer_size); /* Create sysctl tree for this channel */ vmbus_channel_sysctl_create(new_channel); /** * Establish the gpadl for the ring buffer */ new_channel->ring_buffer_gpadl_handle = 0; ret = hv_vmbus_channel_establish_gpadl(new_channel, new_channel->outbound.ring_buffer, send_ring_buffer_size + recv_ring_buffer_size, &new_channel->ring_buffer_gpadl_handle); /* * Open channel w/ the bufring GPADL on the target CPU. */ mh = vmbus_msghc_get(sc, sizeof(*req)); if (mh == NULL) { device_printf(sc->vmbus_dev, "can not get msg hypercall for chopen(chan%u)\n", new_channel->offer_msg.child_rel_id); return ENXIO; } req = vmbus_msghc_dataptr(mh); req->chm_hdr.chm_type = VMBUS_CHANMSG_TYPE_CHOPEN; req->chm_chanid = new_channel->offer_msg.child_rel_id; req->chm_openid = new_channel->offer_msg.child_rel_id; req->chm_gpadl = new_channel->ring_buffer_gpadl_handle; req->chm_vcpuid = new_channel->target_vcpu; req->chm_rxbr_pgofs = send_ring_buffer_size >> PAGE_SHIFT; if (user_data_len) memcpy(req->chm_udata, user_data, user_data_len); ret = vmbus_msghc_exec(sc, mh); if (ret != 0) { device_printf(sc->vmbus_dev, "chopen(chan%u) msg hypercall exec failed: %d\n", new_channel->offer_msg.child_rel_id, ret); vmbus_msghc_put(sc, mh); return ret; } msg = vmbus_msghc_wait_result(sc, mh); resp = (const struct vmbus_chanmsg_chopen_resp *)msg->msg_data; status = resp->chm_status; vmbus_msghc_put(sc, mh); if (status == 0) { new_channel->state = HV_CHANNEL_OPENED_STATE; if (bootverbose) { device_printf(sc->vmbus_dev, "chan%u opened\n", new_channel->offer_msg.child_rel_id); } } else { device_printf(sc->vmbus_dev, "failed to open chan%u\n", new_channel->offer_msg.child_rel_id); ret = ENXIO; } return (ret); } /** * @brief Establish a GPADL for the specified buffer */ int hv_vmbus_channel_establish_gpadl(struct hv_vmbus_channel *channel, void *contig_buffer, uint32_t size, uint32_t *gpadl0) { struct vmbus_softc *sc = channel->vmbus_sc; struct vmbus_msghc *mh; struct vmbus_chanmsg_gpadl_conn *req; const struct vmbus_message *msg; size_t reqsz; uint32_t gpadl, status; int page_count, range_len, i, cnt, error; uint64_t page_id, paddr; /* * Preliminary checks. */ KASSERT((size & PAGE_MASK) == 0, ("invalid GPA size %u, not multiple page size", size)); page_count = size >> PAGE_SHIFT; paddr = hv_get_phys_addr(contig_buffer); KASSERT((paddr & PAGE_MASK) == 0, ("GPA is not page aligned %jx", (uintmax_t)paddr)); page_id = paddr >> PAGE_SHIFT; range_len = __offsetof(struct vmbus_gpa_range, gpa_page[page_count]); /* * We don't support multiple GPA ranges. */ if (range_len > UINT16_MAX) { device_printf(sc->vmbus_dev, "GPA too large, %d pages\n", page_count); return EOPNOTSUPP; } /* * Allocate GPADL id. */ gpadl = vmbus_gpadl_alloc(sc); *gpadl0 = gpadl; /* * Connect this GPADL to the target channel. * * NOTE: * Since each message can only hold small set of page * addresses, several messages may be required to * complete the connection. */ if (page_count > VMBUS_CHANMSG_GPADL_CONN_PGMAX) cnt = VMBUS_CHANMSG_GPADL_CONN_PGMAX; else cnt = page_count; page_count -= cnt; reqsz = __offsetof(struct vmbus_chanmsg_gpadl_conn, chm_range.gpa_page[cnt]); mh = vmbus_msghc_get(sc, reqsz); if (mh == NULL) { device_printf(sc->vmbus_dev, "can not get msg hypercall for gpadl->chan%u\n", channel->offer_msg.child_rel_id); return EIO; } req = vmbus_msghc_dataptr(mh); req->chm_hdr.chm_type = VMBUS_CHANMSG_TYPE_GPADL_CONN; req->chm_chanid = channel->offer_msg.child_rel_id; req->chm_gpadl = gpadl; req->chm_range_len = range_len; req->chm_range_cnt = 1; req->chm_range.gpa_len = size; req->chm_range.gpa_ofs = 0; for (i = 0; i < cnt; ++i) req->chm_range.gpa_page[i] = page_id++; error = vmbus_msghc_exec(sc, mh); if (error) { device_printf(sc->vmbus_dev, "gpadl->chan%u msg hypercall exec failed: %d\n", channel->offer_msg.child_rel_id, error); vmbus_msghc_put(sc, mh); return error; } while (page_count > 0) { struct vmbus_chanmsg_gpadl_subconn *subreq; if (page_count > VMBUS_CHANMSG_GPADL_SUBCONN_PGMAX) cnt = VMBUS_CHANMSG_GPADL_SUBCONN_PGMAX; else cnt = page_count; page_count -= cnt; reqsz = __offsetof(struct vmbus_chanmsg_gpadl_subconn, chm_gpa_page[cnt]); vmbus_msghc_reset(mh, reqsz); subreq = vmbus_msghc_dataptr(mh); subreq->chm_hdr.chm_type = VMBUS_CHANMSG_TYPE_GPADL_SUBCONN; subreq->chm_gpadl = gpadl; for (i = 0; i < cnt; ++i) subreq->chm_gpa_page[i] = page_id++; vmbus_msghc_exec_noresult(mh); } KASSERT(page_count == 0, ("invalid page count %d", page_count)); msg = vmbus_msghc_wait_result(sc, mh); status = ((const struct vmbus_chanmsg_gpadl_connresp *) msg->msg_data)->chm_status; vmbus_msghc_put(sc, mh); if (status != 0) { device_printf(sc->vmbus_dev, "gpadl->chan%u failed: " "status %u\n", channel->offer_msg.child_rel_id, status); return EIO; } else { if (bootverbose) { device_printf(sc->vmbus_dev, "gpadl->chan%u " "succeeded\n", channel->offer_msg.child_rel_id); } } return 0; } /* * Disconnect the GPA from the target channel */ int hv_vmbus_channel_teardown_gpdal(struct hv_vmbus_channel *chan, uint32_t gpadl) { struct vmbus_softc *sc = chan->vmbus_sc; struct vmbus_msghc *mh; struct vmbus_chanmsg_gpadl_disconn *req; int error; mh = vmbus_msghc_get(sc, sizeof(*req)); if (mh == NULL) { device_printf(sc->vmbus_dev, "can not get msg hypercall for gpa x->chan%u\n", chan->offer_msg.child_rel_id); return EBUSY; } req = vmbus_msghc_dataptr(mh); req->chm_hdr.chm_type = VMBUS_CHANMSG_TYPE_GPADL_DISCONN; req->chm_chanid = chan->offer_msg.child_rel_id; req->chm_gpadl = gpadl; error = vmbus_msghc_exec(sc, mh); if (error) { device_printf(sc->vmbus_dev, "gpa x->chan%u msg hypercall exec failed: %d\n", chan->offer_msg.child_rel_id, error); vmbus_msghc_put(sc, mh); return error; } vmbus_msghc_wait_result(sc, mh); /* Discard result; no useful information */ vmbus_msghc_put(sc, mh); return 0; } static void hv_vmbus_channel_close_internal(hv_vmbus_channel *channel) { struct vmbus_softc *sc = channel->vmbus_sc; struct vmbus_msghc *mh; struct vmbus_chanmsg_chclose *req; struct taskqueue *rxq = channel->rxq; int error; channel->state = HV_CHANNEL_OPEN_STATE; + sysctl_ctx_free(&channel->ch_sysctl_ctx); /* * set rxq to NULL to avoid more requests be scheduled */ channel->rxq = NULL; taskqueue_drain(rxq, &channel->channel_task); channel->on_channel_callback = NULL; /** * Send a closing message */ mh = vmbus_msghc_get(sc, sizeof(*req)); if (mh == NULL) { device_printf(sc->vmbus_dev, "can not get msg hypercall for chclose(chan%u)\n", channel->offer_msg.child_rel_id); return; } req = vmbus_msghc_dataptr(mh); req->chm_hdr.chm_type = VMBUS_CHANMSG_TYPE_CHCLOSE; req->chm_chanid = channel->offer_msg.child_rel_id; error = vmbus_msghc_exec_noresult(mh); vmbus_msghc_put(sc, mh); if (error) { device_printf(sc->vmbus_dev, "chclose(chan%u) msg hypercall exec failed: %d\n", channel->offer_msg.child_rel_id, error); return; } else if (bootverbose) { device_printf(sc->vmbus_dev, "close chan%u\n", channel->offer_msg.child_rel_id); } /* Tear down the gpadl for the channel's ring buffer */ if (channel->ring_buffer_gpadl_handle) { hv_vmbus_channel_teardown_gpdal(channel, channel->ring_buffer_gpadl_handle); } /* TODO: Send a msg to release the childRelId */ /* cleanup the ring buffers for this channel */ hv_ring_buffer_cleanup(&channel->outbound); hv_ring_buffer_cleanup(&channel->inbound); contigfree(channel->ring_buffer_pages, channel->ring_buffer_size, M_DEVBUF); } /** * @brief Close the specified channel */ void hv_vmbus_channel_close(hv_vmbus_channel *channel) { hv_vmbus_channel* sub_channel; if (channel->primary_channel != NULL) { /* * We only close multi-channels when the primary is * closed. */ return; } /* * Close all multi-channels first. */ TAILQ_FOREACH(sub_channel, &channel->sc_list_anchor, sc_list_entry) { if (sub_channel->state != HV_CHANNEL_OPENED_STATE) continue; hv_vmbus_channel_close_internal(sub_channel); } /* * Then close the primary channel. */ hv_vmbus_channel_close_internal(channel); } /** * @brief Send the specified buffer on the given channel */ int hv_vmbus_channel_send_packet( hv_vmbus_channel* channel, void* buffer, uint32_t buffer_len, uint64_t request_id, hv_vmbus_packet_type type, uint32_t flags) { int ret = 0; hv_vm_packet_descriptor desc; uint32_t packet_len; uint64_t aligned_data; uint32_t packet_len_aligned; boolean_t need_sig; hv_vmbus_sg_buffer_list buffer_list[3]; packet_len = sizeof(hv_vm_packet_descriptor) + buffer_len; packet_len_aligned = HV_ALIGN_UP(packet_len, sizeof(uint64_t)); aligned_data = 0; /* Setup the descriptor */ desc.type = type; /* HV_VMBUS_PACKET_TYPE_DATA_IN_BAND; */ desc.flags = flags; /* HV_VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED */ /* in 8-bytes granularity */ desc.data_offset8 = sizeof(hv_vm_packet_descriptor) >> 3; desc.length8 = (uint16_t) (packet_len_aligned >> 3); desc.transaction_id = request_id; buffer_list[0].data = &desc; buffer_list[0].length = sizeof(hv_vm_packet_descriptor); buffer_list[1].data = buffer; buffer_list[1].length = buffer_len; buffer_list[2].data = &aligned_data; buffer_list[2].length = packet_len_aligned - packet_len; ret = hv_ring_buffer_write(&channel->outbound, buffer_list, 3, &need_sig); /* TODO: We should determine if this is optional */ if (ret == 0 && need_sig) { vmbus_channel_set_event(channel); } return (ret); } /** * @brief Send a range of single-page buffer packets using * a GPADL Direct packet type */ int hv_vmbus_channel_send_packet_pagebuffer( hv_vmbus_channel* channel, hv_vmbus_page_buffer page_buffers[], uint32_t page_count, void* buffer, uint32_t buffer_len, uint64_t request_id) { int ret = 0; boolean_t need_sig; uint32_t packet_len; uint32_t page_buflen; uint32_t packetLen_aligned; hv_vmbus_sg_buffer_list buffer_list[4]; hv_vmbus_channel_packet_page_buffer desc; uint32_t descSize; uint64_t alignedData = 0; if (page_count > HV_MAX_PAGE_BUFFER_COUNT) return (EINVAL); /* * Adjust the size down since hv_vmbus_channel_packet_page_buffer * is the largest size we support */ descSize = __offsetof(hv_vmbus_channel_packet_page_buffer, range); page_buflen = sizeof(hv_vmbus_page_buffer) * page_count; packet_len = descSize + page_buflen + buffer_len; packetLen_aligned = HV_ALIGN_UP(packet_len, sizeof(uint64_t)); /* Setup the descriptor */ desc.type = HV_VMBUS_PACKET_TYPE_DATA_USING_GPA_DIRECT; desc.flags = HV_VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED; /* in 8-bytes granularity */ desc.data_offset8 = (descSize + page_buflen) >> 3; desc.length8 = (uint16_t) (packetLen_aligned >> 3); desc.transaction_id = request_id; desc.range_count = page_count; buffer_list[0].data = &desc; buffer_list[0].length = descSize; buffer_list[1].data = page_buffers; buffer_list[1].length = page_buflen; buffer_list[2].data = buffer; buffer_list[2].length = buffer_len; buffer_list[3].data = &alignedData; buffer_list[3].length = packetLen_aligned - packet_len; ret = hv_ring_buffer_write(&channel->outbound, buffer_list, 4, &need_sig); /* TODO: We should determine if this is optional */ if (ret == 0 && need_sig) { vmbus_channel_set_event(channel); } return (ret); } /** * @brief Send a multi-page buffer packet using a GPADL Direct packet type */ int hv_vmbus_channel_send_packet_multipagebuffer( hv_vmbus_channel* channel, hv_vmbus_multipage_buffer* multi_page_buffer, void* buffer, uint32_t buffer_len, uint64_t request_id) { int ret = 0; uint32_t desc_size; boolean_t need_sig; uint32_t packet_len; uint32_t packet_len_aligned; uint32_t pfn_count; uint64_t aligned_data = 0; hv_vmbus_sg_buffer_list buffer_list[3]; hv_vmbus_channel_packet_multipage_buffer desc; pfn_count = HV_NUM_PAGES_SPANNED( multi_page_buffer->offset, multi_page_buffer->length); if ((pfn_count == 0) || (pfn_count > HV_MAX_MULTIPAGE_BUFFER_COUNT)) return (EINVAL); /* * Adjust the size down since hv_vmbus_channel_packet_multipage_buffer * is the largest size we support */ desc_size = sizeof(hv_vmbus_channel_packet_multipage_buffer) - ((HV_MAX_MULTIPAGE_BUFFER_COUNT - pfn_count) * sizeof(uint64_t)); packet_len = desc_size + buffer_len; packet_len_aligned = HV_ALIGN_UP(packet_len, sizeof(uint64_t)); /* * Setup the descriptor */ desc.type = HV_VMBUS_PACKET_TYPE_DATA_USING_GPA_DIRECT; desc.flags = HV_VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED; desc.data_offset8 = desc_size >> 3; /* in 8-bytes granularity */ desc.length8 = (uint16_t) (packet_len_aligned >> 3); desc.transaction_id = request_id; desc.range_count = 1; desc.range.length = multi_page_buffer->length; desc.range.offset = multi_page_buffer->offset; memcpy(desc.range.pfn_array, multi_page_buffer->pfn_array, pfn_count * sizeof(uint64_t)); buffer_list[0].data = &desc; buffer_list[0].length = desc_size; buffer_list[1].data = buffer; buffer_list[1].length = buffer_len; buffer_list[2].data = &aligned_data; buffer_list[2].length = packet_len_aligned - packet_len; ret = hv_ring_buffer_write(&channel->outbound, buffer_list, 3, &need_sig); /* TODO: We should determine if this is optional */ if (ret == 0 && need_sig) { vmbus_channel_set_event(channel); } return (ret); } /** * @brief Retrieve the user packet on the specified channel */ int hv_vmbus_channel_recv_packet( hv_vmbus_channel* channel, void* Buffer, uint32_t buffer_len, uint32_t* buffer_actual_len, uint64_t* request_id) { int ret; uint32_t user_len; uint32_t packet_len; hv_vm_packet_descriptor desc; *buffer_actual_len = 0; *request_id = 0; ret = hv_ring_buffer_peek(&channel->inbound, &desc, sizeof(hv_vm_packet_descriptor)); if (ret != 0) return (0); packet_len = desc.length8 << 3; user_len = packet_len - (desc.data_offset8 << 3); *buffer_actual_len = user_len; if (user_len > buffer_len) return (EINVAL); *request_id = desc.transaction_id; /* Copy over the packet to the user buffer */ ret = hv_ring_buffer_read(&channel->inbound, Buffer, user_len, (desc.data_offset8 << 3)); return (0); } /** * @brief Retrieve the raw packet on the specified channel */ int hv_vmbus_channel_recv_packet_raw( hv_vmbus_channel* channel, void* buffer, uint32_t buffer_len, uint32_t* buffer_actual_len, uint64_t* request_id) { int ret; uint32_t packetLen; hv_vm_packet_descriptor desc; *buffer_actual_len = 0; *request_id = 0; ret = hv_ring_buffer_peek( &channel->inbound, &desc, sizeof(hv_vm_packet_descriptor)); if (ret != 0) return (0); packetLen = desc.length8 << 3; *buffer_actual_len = packetLen; if (packetLen > buffer_len) return (ENOBUFS); *request_id = desc.transaction_id; /* Copy over the entire packet to the user buffer */ ret = hv_ring_buffer_read(&channel->inbound, buffer, packetLen, 0); return (0); } /** * Process a channel event notification */ static void VmbusProcessChannelEvent(void* context, int pending) { void* arg; uint32_t bytes_to_read; hv_vmbus_channel* channel = (hv_vmbus_channel*)context; boolean_t is_batched_reading; if (channel->on_channel_callback != NULL) { arg = channel->channel_callback_context; is_batched_reading = channel->batched_reading; /* * Optimize host to guest signaling by ensuring: * 1. While reading the channel, we disable interrupts from * host. * 2. Ensure that we process all posted messages from the host * before returning from this callback. * 3. Once we return, enable signaling from the host. Once this * state is set we check to see if additional packets are * available to read. In this case we repeat the process. */ do { if (is_batched_reading) hv_ring_buffer_read_begin(&channel->inbound); channel->on_channel_callback(arg); if (is_batched_reading) bytes_to_read = hv_ring_buffer_read_end(&channel->inbound); else bytes_to_read = 0; } while (is_batched_reading && (bytes_to_read != 0)); } }