1 files changed, 626 insertions, 0 deletions

diff --git a/drivers/hv/hyperv_vmbus.h b/drivers/hv/hyperv_vmbus.h
new file mode 100644
index 000000000000..0aee1122734c
--- /dev/null
+++ b/drivers/hv/hyperv_vmbus.h
@@ -0,0 +1,626 @@
+/*
+ *
+ * Copyright (c) 2011, Microsoft Corporation.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * this program; if not, write to the Free Software Foundation, Inc., 59 Temple
+ * Place - Suite 330, Boston, MA 02111-1307 USA.
+ *
+ * Authors:
+ *   Haiyang Zhang <haiyangz@microsoft.com>
+ *   Hank Janssen  <hjanssen@microsoft.com>
+ *   K. Y. Srinivasan <kys@microsoft.com>
+ *
+ */
+
+#ifndef _HYPERV_VMBUS_H
+#define _HYPERV_VMBUS_H
+
+#include <linux/list.h>
+#include <asm/sync_bitops.h>
+#include <linux/atomic.h>
+#include <linux/hyperv.h>
+
+/*
+ * The below CPUID leaves are present if VersionAndFeatures.HypervisorPresent
+ * is set by CPUID(HVCPUID_VERSION_FEATURES).
+ */
+enum hv_cpuid_function {
+        HVCPUID_VERSION_FEATURES                = 0x00000001,
+        HVCPUID_VENDOR_MAXFUNCTION              = 0x40000000,
+        HVCPUID_INTERFACE                       = 0x40000001,
+
+        /*
+         * The remaining functions depend on the value of
+         * HVCPUID_INTERFACE
+         */
+        HVCPUID_VERSION                 = 0x40000002,
+        HVCPUID_FEATURES                        = 0x40000003,
+        HVCPUID_ENLIGHTENMENT_INFO      = 0x40000004,
+        HVCPUID_IMPLEMENTATION_LIMITS           = 0x40000005,
+};
+
+/* Define version of the synthetic interrupt controller. */
+#define HV_SYNIC_VERSION                (1)
+
+/* Define the expected SynIC version. */
+#define HV_SYNIC_VERSION_1              (0x1)
+
+/* Define synthetic interrupt controller message constants. */
+#define HV_MESSAGE_SIZE                 (256)
+#define HV_MESSAGE_PAYLOAD_BYTE_COUNT   (240)
+#define HV_MESSAGE_PAYLOAD_QWORD_COUNT  (30)
+#define HV_ANY_VP                       (0xFFFFFFFF)
+
+/* Define synthetic interrupt controller flag constants. */
+#define HV_EVENT_FLAGS_COUNT            (256 * 8)
+#define HV_EVENT_FLAGS_BYTE_COUNT       (256)
+#define HV_EVENT_FLAGS_DWORD_COUNT      (256 / sizeof(u32))
+
+/* Define hypervisor message types. */
+enum hv_message_type {
+        HVMSG_NONE                      = 0x00000000,
+
+        /* Memory access messages. */
+        HVMSG_UNMAPPED_GPA              = 0x80000000,
+        HVMSG_GPA_INTERCEPT             = 0x80000001,
+
+        /* Timer notification messages. */
+        HVMSG_TIMER_EXPIRED                     = 0x80000010,
+
+        /* Error messages. */
+        HVMSG_INVALID_VP_REGISTER_VALUE = 0x80000020,
+        HVMSG_UNRECOVERABLE_EXCEPTION   = 0x80000021,
+        HVMSG_UNSUPPORTED_FEATURE               = 0x80000022,
+
+        /* Trace buffer complete messages. */
+        HVMSG_EVENTLOG_BUFFERCOMPLETE   = 0x80000040,
+
+        /* Platform-specific processor intercept messages. */
+        HVMSG_X64_IOPORT_INTERCEPT              = 0x80010000,
+        HVMSG_X64_MSR_INTERCEPT         = 0x80010001,
+        HVMSG_X64_CPUID_INTERCEPT               = 0x80010002,
+        HVMSG_X64_EXCEPTION_INTERCEPT   = 0x80010003,
+        HVMSG_X64_APIC_EOI                      = 0x80010004,
+        HVMSG_X64_LEGACY_FP_ERROR               = 0x80010005
+};
+
+/* Define the number of synthetic interrupt sources. */
+#define HV_SYNIC_SINT_COUNT             (16)
+#define HV_SYNIC_STIMER_COUNT           (4)
+
+/* Define invalid partition identifier. */
+#define HV_PARTITION_ID_INVALID         ((u64)0x0)
+
+/* Define connection identifier type. */
+union hv_connection_id {
+        u32 asu32;
+        struct {
+                u32 id:24;
+                u32 reserved:8;
+        } u;
+};
+
+/* Define port identifier type. */
+union hv_port_id {
+        u32 asu32;
+        struct {
+                u32 id:24;
+                u32 reserved:8;
+        } u ;
+};
+
+/* Define port type. */
+enum hv_port_type {
+        HVPORT_MSG      = 1,
+        HVPORT_EVENT            = 2,
+        HVPORT_MONITOR  = 3
+};
+
+/* Define port information structure. */
+struct hv_port_info {
+        enum hv_port_type port_type;
+        u32 padding;
+        union {
+                struct {
+                        u32 target_sint;
+                        u32 target_vp;
+                        u64 rsvdz;
+                } message_port_info;
+                struct {
+                        u32 target_sint;
+                        u32 target_vp;
+                        u16 base_flag_bumber;
+                        u16 flag_count;
+                        u32 rsvdz;
+                } event_port_info;
+                struct {
+                        u64 monitor_address;
+                        u64 rsvdz;
+                } monitor_port_info;
+        };
+};
+
+struct hv_connection_info {
+        enum hv_port_type port_type;
+        u32 padding;
+        union {
+                struct {
+                        u64 rsvdz;
+                } message_connection_info;
+                struct {
+                        u64 rsvdz;
+                } event_connection_info;
+                struct {
+                        u64 monitor_address;
+                } monitor_connection_info;
+        };
+};
+
+/* Define synthetic interrupt controller message flags. */
+union hv_message_flags {
+        u8 asu8;
+        struct {
+                u8 msg_pending:1;
+                u8 reserved:7;
+        };
+};
+
+/* Define synthetic interrupt controller message header. */
+struct hv_message_header {
+        enum hv_message_type message_type;
+        u8 payload_size;
+        union hv_message_flags message_flags;
+        u8 reserved[2];
+        union {
+                u64 sender;
+                union hv_port_id port;
+        };
+};
+
+/* Define timer message payload structure. */
+struct hv_timer_message_payload {
+        u32 timer_index;
+        u32 reserved;
+        u64 expiration_time;    /* When the timer expired */
+        u64 delivery_time;      /* When the message was delivered */
+};
+
+/* Define synthetic interrupt controller message format. */
+struct hv_message {
+        struct hv_message_header header;
+        union {
+                u64 payload[HV_MESSAGE_PAYLOAD_QWORD_COUNT];
+        } u ;
+};
+
+/* Define the number of message buffers associated with each port. */
+#define HV_PORT_MESSAGE_BUFFER_COUNT    (16)
+
+/* Define the synthetic interrupt message page layout. */
+struct hv_message_page {
+        struct hv_message sint_message[HV_SYNIC_SINT_COUNT];
+};
+
+/* Define the synthetic interrupt controller event flags format. */
+union hv_synic_event_flags {
+        u8 flags8[HV_EVENT_FLAGS_BYTE_COUNT];
+        u32 flags32[HV_EVENT_FLAGS_DWORD_COUNT];
+};
+
+/* Define the synthetic interrupt flags page layout. */
+struct hv_synic_event_flags_page {
+        union hv_synic_event_flags sintevent_flags[HV_SYNIC_SINT_COUNT];
+};
+
+/* Define SynIC control register. */
+union hv_synic_scontrol {
+        u64 as_uint64;
+        struct {
+                u64 enable:1;
+                u64 reserved:63;
+        };
+};
+
+/* Define synthetic interrupt source. */
+union hv_synic_sint {
+        u64 as_uint64;
+        struct {
+                u64 vector:8;
+                u64 reserved1:8;
+                u64 masked:1;
+                u64 auto_eoi:1;
+                u64 reserved2:46;
+        };
+};
+
+/* Define the format of the SIMP register */
+union hv_synic_simp {
+        u64 as_uint64;
+        struct {
+                u64 simp_enabled:1;
+                u64 preserved:11;
+                u64 base_simp_gpa:52;
+        };
+};
+
+/* Define the format of the SIEFP register */
+union hv_synic_siefp {
+        u64 as_uint64;
+        struct {
+                u64 siefp_enabled:1;
+                u64 preserved:11;
+                u64 base_siefp_gpa:52;
+        };
+};
+
+/* Definitions for the monitored notification facility */
+union hv_monitor_trigger_group {
+        u64 as_uint64;
+        struct {
+                u32 pending;
+                u32 armed;
+        };
+};
+
+struct hv_monitor_parameter {
+        union hv_connection_id connectionid;
+        u16 flagnumber;
+        u16 rsvdz;
+};
+
+union hv_monitor_trigger_state {
+        u32 asu32;
+
+        struct {
+                u32 group_enable:4;
+                u32 rsvdz:28;
+        };
+};
+
+/* struct hv_monitor_page Layout */
+/* ------------------------------------------------------ */
+/* | 0   | TriggerState (4 bytes) | Rsvd1 (4 bytes)     | */
+/* | 8   | TriggerGroup[0]                              | */
+/* | 10  | TriggerGroup[1]                              | */
+/* | 18  | TriggerGroup[2]                              | */
+/* | 20  | TriggerGroup[3]                              | */
+/* | 28  | Rsvd2[0]                                     | */
+/* | 30  | Rsvd2[1]                                     | */
+/* | 38  | Rsvd2[2]                                     | */
+/* | 40  | NextCheckTime[0][0]    | NextCheckTime[0][1] | */
+/* | ...                                                | */
+/* | 240 | Latency[0][0..3]                             | */
+/* | 340 | Rsvz3[0]                                     | */
+/* | 440 | Parameter[0][0]                              | */
+/* | 448 | Parameter[0][1]                              | */
+/* | ...                                                | */
+/* | 840 | Rsvd4[0]                                     | */
+/* ------------------------------------------------------ */
+struct hv_monitor_page {
+        union hv_monitor_trigger_state trigger_state;
+        u32 rsvdz1;
+
+        union hv_monitor_trigger_group trigger_group[4];
+        u64 rsvdz2[3];
+
+        s32 next_checktime[4][32];
+
+        u16 latency[4][32];
+        u64 rsvdz3[32];
+
+        struct hv_monitor_parameter parameter[4][32];
+
+        u8 rsvdz4[1984];
+};
+
+/* Declare the various hypercall operations. */
+enum hv_call_code {
+        HVCALL_POST_MESSAGE     = 0x005c,
+        HVCALL_SIGNAL_EVENT     = 0x005d,
+};
+
+/* Definition of the hv_post_message hypercall input structure. */
+struct hv_input_post_message {
+        union hv_connection_id connectionid;
+        u32 reserved;
+        enum hv_message_type message_type;
+        u32 payload_size;
+        u64 payload[HV_MESSAGE_PAYLOAD_QWORD_COUNT];
+};
+
+/* Definition of the hv_signal_event hypercall input structure. */
+struct hv_input_signal_event {
+        union hv_connection_id connectionid;
+        u16 flag_number;
+        u16 rsvdz;
+};
+
+/*
+ * Versioning definitions used for guests reporting themselves to the
+ * hypervisor, and visa versa.
+ */
+
+/* Version info reported by guest OS's */
+enum hv_guest_os_vendor {
+        HVGUESTOS_VENDOR_MICROSOFT      = 0x0001
+};
+
+enum hv_guest_os_microsoft_ids {
+        HVGUESTOS_MICROSOFT_UNDEFINED   = 0x00,
+        HVGUESTOS_MICROSOFT_MSDOS               = 0x01,
+        HVGUESTOS_MICROSOFT_WINDOWS3X   = 0x02,
+        HVGUESTOS_MICROSOFT_WINDOWS9X   = 0x03,
+        HVGUESTOS_MICROSOFT_WINDOWSNT   = 0x04,
+        HVGUESTOS_MICROSOFT_WINDOWSCE   = 0x05
+};
+
+/*
+ * Declare the MSR used to identify the guest OS.
+ */
+#define HV_X64_MSR_GUEST_OS_ID  0x40000000
+
+union hv_x64_msr_guest_os_id_contents {
+        u64 as_uint64;
+        struct {
+                u64 build_number:16;
+                u64 service_version:8; /* Service Pack, etc. */
+                u64 minor_version:8;
+                u64 major_version:8;
+                u64 os_id:8; /* enum hv_guest_os_microsoft_ids (if Vendor=MS) */
+                u64 vendor_id:16; /* enum hv_guest_os_vendor */
+        };
+};
+
+/*
+ * Declare the MSR used to setup pages used to communicate with the hypervisor.
+ */
+#define HV_X64_MSR_HYPERCALL    0x40000001
+
+union hv_x64_msr_hypercall_contents {
+        u64 as_uint64;
+        struct {
+                u64 enable:1;
+                u64 reserved:11;
+                u64 guest_physical_address:52;
+        };
+};
+
+
+enum {
+        VMBUS_MESSAGE_CONNECTION_ID     = 1,
+        VMBUS_MESSAGE_PORT_ID           = 1,
+        VMBUS_EVENT_CONNECTION_ID       = 2,
+        VMBUS_EVENT_PORT_ID             = 2,
+        VMBUS_MONITOR_CONNECTION_ID     = 3,
+        VMBUS_MONITOR_PORT_ID           = 3,
+        VMBUS_MESSAGE_SINT              = 2,
+};
+
+/* #defines */
+
+#define HV_PRESENT_BIT                  0x80000000
+
+#define HV_LINUX_GUEST_ID_LO            0x00000000
+#define HV_LINUX_GUEST_ID_HI            0xB16B00B5
+#define HV_LINUX_GUEST_ID               (((u64)HV_LINUX_GUEST_ID_HI << 32) | \
+                                           HV_LINUX_GUEST_ID_LO)
+
+#define HV_CPU_POWER_MANAGEMENT         (1 << 0)
+#define HV_RECOMMENDATIONS_MAX          4
+
+#define HV_X64_MAX                      5
+#define HV_CAPS_MAX                     8
+
+
+#define HV_HYPERCALL_PARAM_ALIGN        sizeof(u64)
+
+
+/* Service definitions */
+
+#define HV_SERVICE_PARENT_PORT                          (0)
+#define HV_SERVICE_PARENT_CONNECTION                    (0)
+
+#define HV_SERVICE_CONNECT_RESPONSE_SUCCESS             (0)
+#define HV_SERVICE_CONNECT_RESPONSE_INVALID_PARAMETER   (1)
+#define HV_SERVICE_CONNECT_RESPONSE_UNKNOWN_SERVICE     (2)
+#define HV_SERVICE_CONNECT_RESPONSE_CONNECTION_REJECTED (3)
+
+#define HV_SERVICE_CONNECT_REQUEST_MESSAGE_ID           (1)
+#define HV_SERVICE_CONNECT_RESPONSE_MESSAGE_ID          (2)
+#define HV_SERVICE_DISCONNECT_REQUEST_MESSAGE_ID        (3)
+#define HV_SERVICE_DISCONNECT_RESPONSE_MESSAGE_ID       (4)
+#define HV_SERVICE_MAX_MESSAGE_ID                               (4)
+
+#define HV_SERVICE_PROTOCOL_VERSION (0x0010)
+#define HV_CONNECT_PAYLOAD_BYTE_COUNT 64
+
+/* #define VMBUS_REVISION_NUMBER        6 */
+
+/* Our local vmbus's port and connection id. Anything >0 is fine */
+/* #define VMBUS_PORT_ID                11 */
+
+/* 628180B8-308D-4c5e-B7DB-1BEB62E62EF4 */
+static const uuid_le VMBUS_SERVICE_ID = {
+        .b = {
+                0xb8, 0x80, 0x81, 0x62, 0x8d, 0x30, 0x5e, 0x4c,
+                0xb7, 0xdb, 0x1b, 0xeb, 0x62, 0xe6, 0x2e, 0xf4
+        },
+};
+
+#define MAX_NUM_CPUS    32
+
+
+struct hv_input_signal_event_buffer {
+        u64 align8;
+        struct hv_input_signal_event event;
+};
+
+struct hv_context {
+        /* We only support running on top of Hyper-V
+        * So at this point this really can only contain the Hyper-V ID
+        */
+        u64 guestid;
+
+        void *hypercall_page;
+
+        bool synic_initialized;
+
+        /*
+         * This is used as an input param to HvCallSignalEvent hypercall. The
+         * input param is immutable in our usage and must be dynamic mem (vs
+         * stack or global). */
+        struct hv_input_signal_event_buffer *signal_event_buffer;
+        /* 8-bytes aligned of the buffer above */
+        struct hv_input_signal_event *signal_event_param;
+
+        void *synic_message_page[MAX_NUM_CPUS];
+        void *synic_event_page[MAX_NUM_CPUS];
+};
+
+extern struct hv_context hv_context;
+
+
+/* Hv Interface */
+
+extern int hv_init(void);
+
+extern void hv_cleanup(void);
+
+extern u16 hv_post_message(union hv_connection_id connection_id,
+                         enum hv_message_type message_type,
+                         void *payload, size_t payload_size);
+
+extern u16 hv_signal_event(void);
+
+extern void hv_synic_init(void *irqarg);
+
+extern void hv_synic_cleanup(void *arg);
+
+
+/* Interface */
+
+
+int hv_ringbuffer_init(struct hv_ring_buffer_info *ring_info, void *buffer,
+                   u32 buflen);
+
+void hv_ringbuffer_cleanup(struct hv_ring_buffer_info *ring_info);
+
+int hv_ringbuffer_write(struct hv_ring_buffer_info *ring_info,
+                    struct scatterlist *sglist,
+                    u32 sgcount);
+
+int hv_ringbuffer_peek(struct hv_ring_buffer_info *ring_info, void *buffer,
+                   u32 buflen);
+
+int hv_ringbuffer_read(struct hv_ring_buffer_info *ring_info,
+                   void *buffer,
+                   u32 buflen,
+                   u32 offset);
+
+u32 hv_get_ringbuffer_interrupt_mask(struct hv_ring_buffer_info *ring_info);
+
+void hv_ringbuffer_get_debuginfo(struct hv_ring_buffer_info *ring_info,
+                            struct hv_ring_buffer_debug_info *debug_info);
+
+/*
+ * Maximum channels is determined by the size of the interrupt page
+ * which is PAGE_SIZE. 1/2 of PAGE_SIZE is for send endpoint interrupt
+ * and the other is receive endpoint interrupt
+ */
+#define MAX_NUM_CHANNELS        ((PAGE_SIZE >> 1) << 3) /* 16348 channels */
+
+/* The value here must be in multiple of 32 */
+/* TODO: Need to make this configurable */
+#define MAX_NUM_CHANNELS_SUPPORTED      256
+
+
+enum vmbus_connect_state {
+        DISCONNECTED,
+        CONNECTING,
+        CONNECTED,
+        DISCONNECTING
+};
+
+#define MAX_SIZE_CHANNEL_MESSAGE        HV_MESSAGE_PAYLOAD_BYTE_COUNT
+
+struct vmbus_connection {
+        enum vmbus_connect_state conn_state;
+
+        atomic_t next_gpadl_handle;
+
+        /*
+         * Represents channel interrupts. Each bit position represents a
+         * channel.  When a channel sends an interrupt via VMBUS, it finds its
+         * bit in the sendInterruptPage, set it and calls Hv to generate a port
+         * event. The other end receives the port event and parse the
+         * recvInterruptPage to see which bit is set
+         */
+        void *int_page;
+        void *send_int_page;
+        void *recv_int_page;
+
+        /*
+         * 2 pages - 1st page for parent->child notification and 2nd
+         * is child->parent notification
+         */
+        void *monitor_pages;
+        struct list_head chn_msg_list;
+        spinlock_t channelmsg_lock;
+
+        /* List of channels */
+        struct list_head chn_list;
+        spinlock_t channel_lock;
+
+        struct workqueue_struct *work_queue;
+};
+
+
+struct vmbus_msginfo {
+        /* Bookkeeping stuff */
+        struct list_head msglist_entry;
+
+        /* The message itself */
+        unsigned char msg[0];
+};
+
+
+extern struct vmbus_connection vmbus_connection;
+
+/* General vmbus interface */
+
+struct hv_device *vmbus_device_create(uuid_le *type,
+                                         uuid_le *instance,
+                                         struct vmbus_channel *channel);
+
+int vmbus_device_register(struct hv_device *child_device_obj);
+void vmbus_device_unregister(struct hv_device *device_obj);
+
+/* static void */
+/* VmbusChildDeviceDestroy( */
+/* struct hv_device *); */
+
+struct vmbus_channel *relid2channel(u32 relid);
+
+
+/* Connection interface */
+
+int vmbus_connect(void);
+
+int vmbus_post_msg(void *buffer, size_t buflen);
+
+int vmbus_set_event(u32 child_relid);
+
+void vmbus_on_event(unsigned long data);
+
+
+#endif /* _HYPERV_VMBUS_H */