mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-09-04 09:59:32 +00:00
![K. Y. Srinivasan](/assets/img/avatar_default.png)
Fix the rescind handling. This patch addresses the following rescind scenario that is currently not handled correctly: If a rescind were to be received while the offer is still being peocessed, we will be blocked indefinitely since the rescind message is handled on the same work element as the offer message. Fix this issue. I would like to thank Dexuan Cui <decui@microsoft.com> and Long Li <longli@microsoft.com> for working with me on this patch. Signed-off-by: K. Y. Srinivasan <kys@microsoft.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
437 lines
11 KiB
C
437 lines
11 KiB
C
/*
|
|
*
|
|
* 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>
|
|
#include <linux/interrupt.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
|
|
|
|
/* Define synthetic interrupt controller flag constants. */
|
|
#define HV_EVENT_FLAGS_COUNT (256 * 8)
|
|
#define HV_EVENT_FLAGS_LONG_COUNT (256 / sizeof(unsigned long))
|
|
|
|
/*
|
|
* 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 synthetic interrupt controller event flags format. */
|
|
union hv_synic_event_flags {
|
|
unsigned long flags[HV_EVENT_FLAGS_LONG_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];
|
|
};
|
|
|
|
#define HV_HYPERCALL_PARAM_ALIGN sizeof(u64)
|
|
|
|
/* 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];
|
|
};
|
|
|
|
|
|
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,
|
|
};
|
|
|
|
/*
|
|
* Per cpu state for channel handling
|
|
*/
|
|
struct hv_per_cpu_context {
|
|
void *synic_message_page;
|
|
void *synic_event_page;
|
|
/*
|
|
* buffer to post messages to the host.
|
|
*/
|
|
void *post_msg_page;
|
|
|
|
/*
|
|
* 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 msg_dpc;
|
|
|
|
/*
|
|
* To optimize the mapping of relid to channel, maintain
|
|
* per-cpu list of the channels based on their CPU affinity.
|
|
*/
|
|
struct list_head chan_list;
|
|
struct clock_event_device *clk_evt;
|
|
};
|
|
|
|
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 *tsc_page;
|
|
|
|
bool synic_initialized;
|
|
|
|
struct hv_per_cpu_context __percpu *cpu_context;
|
|
|
|
/*
|
|
* 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];
|
|
|
|
/*
|
|
* To manage allocations in a NUMA node.
|
|
* Array indexed by numa node ID.
|
|
*/
|
|
struct cpumask *hv_numa_map;
|
|
};
|
|
|
|
extern struct hv_context hv_context;
|
|
|
|
/* Hv Interface */
|
|
|
|
extern int hv_init(void);
|
|
|
|
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 int hv_synic_init(unsigned int cpu);
|
|
|
|
extern int hv_synic_cleanup(unsigned int cpu);
|
|
|
|
extern void hv_synic_clockevents_cleanup(void);
|
|
|
|
/* 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,
|
|
const struct kvec *kv_list, u32 kv_count);
|
|
|
|
int hv_ringbuffer_read(struct vmbus_channel *channel,
|
|
void *buffer, u32 buflen, u32 *buffer_actual_len,
|
|
u64 *requestid, bool raw);
|
|
|
|
/*
|
|
* 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 {
|
|
/*
|
|
* CPU on which the initial host contact was made.
|
|
*/
|
|
int connect_cpu;
|
|
|
|
atomic_t offer_in_progress;
|
|
|
|
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;
|
|
|
|
static inline void vmbus_send_interrupt(u32 relid)
|
|
{
|
|
sync_set_bit(relid, vmbus_connection.send_int_page);
|
|
}
|
|
|
|
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 const struct vmbus_channel_message_table_entry
|
|
channel_message_table[CHANNELMSG_COUNT];
|
|
|
|
|
|
/* 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);
|
|
|
|
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, bool can_sleep);
|
|
|
|
void vmbus_on_event(unsigned long data);
|
|
void vmbus_on_msg_dpc(unsigned long data);
|
|
|
|
int hv_kvp_init(struct hv_util_service *srv);
|
|
void hv_kvp_deinit(void);
|
|
void hv_kvp_onchannelcallback(void *context);
|
|
|
|
int hv_vss_init(struct hv_util_service *srv);
|
|
void hv_vss_deinit(void);
|
|
void hv_vss_onchannelcallback(void *context);
|
|
|
|
int hv_fcopy_init(struct hv_util_service *srv);
|
|
void hv_fcopy_deinit(void);
|
|
void hv_fcopy_onchannelcallback(void *context);
|
|
void vmbus_initiate_unload(bool crash);
|
|
|
|
static inline void hv_poll_channel(struct vmbus_channel *channel,
|
|
void (*cb)(void *))
|
|
{
|
|
if (!channel)
|
|
return;
|
|
|
|
if (in_interrupt() && (channel->target_cpu == smp_processor_id())) {
|
|
cb(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 */
|