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kernel_optimize_test/drivers/hv/hyperv_vmbus.h
K. Y. Srinivasan 3372592a14 Drivers: hv: vmbus: On the read path cleanup the logic to interrupt the host 
Signal the host when we determine the host is to be signaled -
on th read path. The currrent code determines the need to signal in the
ringbuffer code and actually issues the signal elsewhere. This can result
in the host viewing this interrupt as spurious since the host may also
poll the channel. Make the necessary adjustments.

Signed-off-by: K. Y. Srinivasan <kys@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2016-11-07 10:01:18 +01:00

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/*
*
* 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>
/*
* Timeout for services such as KVP and fcopy.
*/
#define HV_UTIL_TIMEOUT 30
/*
* Timeout for guest-host handshake for services.
*/
#define HV_UTIL_NEGO_TIMEOUT 55
/*
* 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 HV_FEATURE_GUEST_CRASH_MSR_AVAILABLE 0x400
#define HV_X64_MSR_CRASH_P0 0x40000100
#define HV_X64_MSR_CRASH_P1 0x40000101
#define HV_X64_MSR_CRASH_P2 0x40000102
#define HV_X64_MSR_CRASH_P3 0x40000103
#define HV_X64_MSR_CRASH_P4 0x40000104
#define HV_X64_MSR_CRASH_CTL 0x40000105
#define HV_CRASH_CTL_CRASH_NOTIFY (1ULL << 63)
/* Define version of the synthetic interrupt controller. */
#define HV_SYNIC_VERSION (1)
#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 invalid partition identifier. */
#define HV_PARTITION_ID_INVALID ((u64)0x0)
/* 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_number;
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;
};
};
/*
* Timer configuration register.
*/
union hv_timer_config {
u64 as_uint64;
struct {
u64 enable:1;
u64 periodic:1;
u64 lazy:1;
u64 auto_enable:1;
u64 reserved_z0:12;
u64 sintx:4;
u64 reserved_z1:44;
};
};
/* Define the number of message buffers associated with each port. */
#define HV_PORT_MESSAGE_BUFFER_COUNT (16)
/* 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];
};
/* Definition of the hv_post_message hypercall input structure. */
struct hv_input_post_message {
union hv_connection_id connectionid;
u32 reserved;
u32 message_type;
u32 payload_size;
u64 payload[HV_MESSAGE_PAYLOAD_QWORD_COUNT];
};
/*
* 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
/*
* The guest OS needs to register the guest ID with the hypervisor.
* The guest ID is a 64 bit entity and the structure of this ID is
* specified in the Hyper-V specification:
*
* http://msdn.microsoft.com/en-us/library/windows/hardware/ff542653%28v=vs.85%29.aspx
*
* While the current guideline does not specify how Linux guest ID(s)
* need to be generated, our plan is to publish the guidelines for
* Linux and other guest operating systems that currently are hosted
* on Hyper-V. The implementation here conforms to this yet
* unpublished guidelines.
*
*
* Bit(s)
* 63 - Indicates if the OS is Open Source or not; 1 is Open Source
* 62:56 - Os Type; Linux is 0x100
* 55:48 - Distro specific identification
* 47:16 - Linux kernel version number
* 15:0 - Distro specific identification
*
*
*/
#define HV_LINUX_VENDOR_ID 0x8100
/*
* Generate the guest ID based on the guideline described above.
*/
static inline __u64 generate_guest_id(__u8 d_info1, __u32 kernel_version,
__u16 d_info2)
{
__u64 guest_id = 0;
guest_id = (((__u64)HV_LINUX_VENDOR_ID) << 48);
guest_id |= (((__u64)(d_info1)) << 48);
guest_id |= (((__u64)(kernel_version)) << 16);
guest_id |= ((__u64)(d_info2));
return guest_id;
}
#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
},
};
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;
void *tsc_page;
bool synic_initialized;
void *synic_message_page[NR_CPUS];
void *synic_event_page[NR_CPUS];
/*
* Hypervisor's notion of virtual processor ID is different from
* Linux' notion of CPU ID. This information can only be retrieved
* in the context of the calling CPU. Setup a map for easy access
* to this information:
*
* vp_index[a] is the Hyper-V's processor ID corresponding to
* Linux cpuid 'a'.
*/
u32 vp_index[NR_CPUS];
/*
* Starting with win8, we can take channel interrupts on any CPU;
* we will manage the tasklet that handles events messages on a per CPU
* basis.
*/
struct tasklet_struct *event_dpc[NR_CPUS];
struct tasklet_struct *msg_dpc[NR_CPUS];
/*
* To optimize the mapping of relid to channel, maintain
* per-cpu list of the channels based on their CPU affinity.
*/
struct list_head percpu_list[NR_CPUS];
/*
* buffer to post messages to the host.
*/
void *post_msg_page[NR_CPUS];
/*
* Support PV clockevent device.
*/
struct clock_event_device *clk_evt[NR_CPUS];
/*
* To manage allocations in a NUMA node.
* Array indexed by numa node ID.
*/
struct cpumask *hv_numa_map;
};
extern struct hv_context hv_context;
struct ms_hyperv_tsc_page {
volatile u32 tsc_sequence;
u32 reserved1;
volatile u64 tsc_scale;
volatile s64 tsc_offset;
u64 reserved2[509];
};
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;
};
/* Hv Interface */
extern int hv_init(void);
extern void hv_cleanup(bool crash);
extern int hv_post_message(union hv_connection_id connection_id,
enum hv_message_type message_type,
void *payload, size_t payload_size);
extern int hv_synic_alloc(void);
extern void hv_synic_free(void);
extern void hv_synic_init(void *irqarg);
extern void hv_synic_cleanup(void *arg);
extern void hv_synic_clockevents_cleanup(void);
/*
* Host version information.
*/
extern unsigned int host_info_eax;
extern unsigned int host_info_ebx;
extern unsigned int host_info_ecx;
extern unsigned int host_info_edx;
/* Interface */
int hv_ringbuffer_init(struct hv_ring_buffer_info *ring_info,
struct page *pages, u32 pagecnt);
void hv_ringbuffer_cleanup(struct hv_ring_buffer_info *ring_info);
int hv_ringbuffer_write(struct vmbus_channel *channel,
struct kvec *kv_list,
u32 kv_count, bool lock,
bool kick_q);
int hv_ringbuffer_read(struct vmbus_channel *channel,
void *buffer, u32 buflen, u32 *buffer_actual_len,
u64 *requestid, bool raw);
void hv_ringbuffer_get_debuginfo(struct hv_ring_buffer_info *ring_info,
struct hv_ring_buffer_debug_info *debug_info);
void hv_begin_read(struct hv_ring_buffer_info *rbi);
u32 hv_end_read(struct hv_ring_buffer_info *rbi);
/*
* 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;
struct completion unload_event;
/*
* 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
*/
struct hv_monitor_page *monitor_pages[2];
struct list_head chn_msg_list;
spinlock_t channelmsg_lock;
/* List of channels */
struct list_head chn_list;
struct mutex channel_mutex;
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;
enum vmbus_message_handler_type {
/* The related handler can sleep. */
VMHT_BLOCKING = 0,
/* The related handler must NOT sleep. */
VMHT_NON_BLOCKING = 1,
};
struct vmbus_channel_message_table_entry {
enum vmbus_channel_message_type message_type;
enum vmbus_message_handler_type handler_type;
void (*message_handler)(struct vmbus_channel_message_header *msg);
};
extern struct vmbus_channel_message_table_entry
channel_message_table[CHANNELMSG_COUNT];
/* Free the message slot and signal end-of-message if required */
static inline void vmbus_signal_eom(struct hv_message *msg, u32 old_msg_type)
{
/*
* On crash we're reading some other CPU's message page and we need
* to be careful: this other CPU may already had cleared the header
* and the host may already had delivered some other message there.
* In case we blindly write msg->header.message_type we're going
* to lose it. We can still lose a message of the same type but
* we count on the fact that there can only be one
* CHANNELMSG_UNLOAD_RESPONSE and we don't care about other messages
* on crash.
*/
if (cmpxchg(&msg->header.message_type, old_msg_type,
HVMSG_NONE) != old_msg_type)
return;
/*
* Make sure the write to MessageType (ie set to
* HVMSG_NONE) happens before we read the
* MessagePending and EOMing. Otherwise, the EOMing
* will not deliver any more messages since there is
* no empty slot
*/
mb();
if (msg->header.message_flags.msg_pending) {
/*
* This will cause message queue rescan to
* possibly deliver another msg from the
* hypervisor
*/
wrmsrl(HV_X64_MSR_EOM, 0);
}
}
/* General vmbus interface */
struct hv_device *vmbus_device_create(const uuid_le *type,
const 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);
void vmbus_free_channels(void);
/* Connection interface */
int vmbus_connect(void);
void vmbus_disconnect(void);
int vmbus_post_msg(void *buffer, size_t buflen);
void vmbus_on_event(unsigned long data);
void vmbus_on_msg_dpc(unsigned long data);
int hv_kvp_init(struct hv_util_service *);
void hv_kvp_deinit(void);
void hv_kvp_onchannelcallback(void *);
int hv_vss_init(struct hv_util_service *);
void hv_vss_deinit(void);
void hv_vss_onchannelcallback(void *);
int hv_fcopy_init(struct hv_util_service *);
void hv_fcopy_deinit(void);
void hv_fcopy_onchannelcallback(void *);
void vmbus_initiate_unload(bool crash);
static inline void hv_poll_channel(struct vmbus_channel *channel,
void (*cb)(void *))
{
if (!channel)
return;
smp_call_function_single(channel->target_cpu, cb, channel, true);
}
enum hvutil_device_state {
HVUTIL_DEVICE_INIT = 0, /* driver is loaded, waiting for userspace */
HVUTIL_READY, /* userspace is registered */
HVUTIL_HOSTMSG_RECEIVED, /* message from the host was received */
HVUTIL_USERSPACE_REQ, /* request to userspace was sent */
HVUTIL_USERSPACE_RECV, /* reply from userspace was received */
HVUTIL_DEVICE_DYING, /* driver unload is in progress */
};
#endif /* _HYPERV_VMBUS_H */
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