2019-05-30 07:57:35 +08:00
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/* SPDX-License-Identifier: GPL-2.0-only */
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2011-05-13 10:34:28 +08:00
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/*
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*
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* Copyright (c) 2011, Microsoft Corporation.
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*
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* Authors:
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* Haiyang Zhang <haiyangz@microsoft.com>
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* Hank Janssen <hjanssen@microsoft.com>
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* K. Y. Srinivasan <kys@microsoft.com>
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*/
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#ifndef _HYPERV_VMBUS_H
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#define _HYPERV_VMBUS_H
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2011-05-13 10:34:33 +08:00
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#include <linux/list.h>
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#include <asm/sync_bitops.h>
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2018-03-20 22:02:05 +08:00
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#include <asm/hyperv-tlfs.h>
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2011-05-13 10:34:33 +08:00
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#include <linux/atomic.h>
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2011-10-05 03:29:52 +08:00
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#include <linux/hyperv.h>
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2017-02-12 14:02:19 +08:00
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#include <linux/interrupt.h>
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2011-05-13 10:34:33 +08:00
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2017-10-30 03:21:00 +08:00
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#include "hv_trace.h"
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2015-12-15 08:01:32 +08:00
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/*
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* Timeout for services such as KVP and fcopy.
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*/
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#define HV_UTIL_TIMEOUT 30
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2016-05-01 10:21:33 +08:00
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/*
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* Timeout for guest-host handshake for services.
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*/
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2016-11-07 05:14:06 +08:00
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#define HV_UTIL_NEGO_TIMEOUT 55
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2016-05-01 10:21:33 +08:00
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2011-05-13 10:34:29 +08:00
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/* Definitions for the monitored notification facility */
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union hv_monitor_trigger_group {
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u64 as_uint64;
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struct {
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u32 pending;
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u32 armed;
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};
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};
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struct hv_monitor_parameter {
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union hv_connection_id connectionid;
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u16 flagnumber;
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u16 rsvdz;
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};
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union hv_monitor_trigger_state {
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u32 asu32;
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struct {
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u32 group_enable:4;
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u32 rsvdz:28;
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};
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};
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/* struct hv_monitor_page Layout */
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/* ------------------------------------------------------ */
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/* | 0 | TriggerState (4 bytes) | Rsvd1 (4 bytes) | */
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/* | 8 | TriggerGroup[0] | */
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/* | 10 | TriggerGroup[1] | */
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/* | 18 | TriggerGroup[2] | */
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/* | 20 | TriggerGroup[3] | */
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/* | 28 | Rsvd2[0] | */
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/* | 30 | Rsvd2[1] | */
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/* | 38 | Rsvd2[2] | */
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/* | 40 | NextCheckTime[0][0] | NextCheckTime[0][1] | */
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/* | ... | */
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/* | 240 | Latency[0][0..3] | */
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/* | 340 | Rsvz3[0] | */
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/* | 440 | Parameter[0][0] | */
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/* | 448 | Parameter[0][1] | */
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/* | ... | */
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/* | 840 | Rsvd4[0] | */
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/* ------------------------------------------------------ */
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struct hv_monitor_page {
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union hv_monitor_trigger_state trigger_state;
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u32 rsvdz1;
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union hv_monitor_trigger_group trigger_group[4];
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u64 rsvdz2[3];
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s32 next_checktime[4][32];
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u16 latency[4][32];
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u64 rsvdz3[32];
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struct hv_monitor_parameter parameter[4][32];
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u8 rsvdz4[1984];
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};
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2017-01-20 02:51:59 +08:00
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#define HV_HYPERCALL_PARAM_ALIGN sizeof(u64)
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2011-05-13 10:34:29 +08:00
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/* Definition of the hv_post_message hypercall input structure. */
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struct hv_input_post_message {
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union hv_connection_id connectionid;
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u32 reserved;
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2015-12-01 00:22:13 +08:00
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u32 message_type;
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2011-05-13 10:34:29 +08:00
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u32 payload_size;
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u64 payload[HV_MESSAGE_PAYLOAD_QWORD_COUNT];
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};
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2011-05-13 10:34:30 +08:00
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enum {
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VMBUS_MESSAGE_CONNECTION_ID = 1,
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Drivers: hv: vmbus: enable VMBus protocol version 5.0
With VMBus protocol 5.0, we're able to better support new features, e.g.
running two or more VMBus drivers simultaneously in a single VM -- note:
we can't simply load the current VMBus driver twice, instead, a secondary
VMBus driver must be implemented.
This patch adds the support for the new VMBus protocol, which is available
on new Windows hosts, by:
1) We still use SINT2 for compatibility;
2) We must use Connection ID 4 for the Initiate Contact Message, and for
subsequent messages, we must use the Message Connection ID field in
the host-returned VersionResponse Message.
Notes for developers of the secondary VMBus driver:
1) Must use VMBus protocol 5.0 as well;
2) Must use a different SINT number that is not in use.
3) Must use Connection ID 4 for the Initiate Contact Message, and for
subsequent messages, must use the Message Connection ID field in
the host-returned VersionResponse Message.
4) It's possible that the primary VMBus driver using protocol version 4.0
can work with a secondary VMBus driver using protocol version 5.0, but it's
recommended that both should use 5.0 for new Hyper-V features in the future.
Signed-off-by: Dexuan Cui <decui@microsoft.com>
Cc: Stephen Hemminger <sthemmin@microsoft.com>
Cc: K. Y. Srinivasan <kys@microsoft.com>
Cc: Michael Kelley <mikelley@microsoft.com>
Signed-off-by: K. Y. Srinivasan <kys@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2018-05-12 17:30:33 +08:00
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VMBUS_MESSAGE_CONNECTION_ID_4 = 4,
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2011-05-13 10:34:30 +08:00
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VMBUS_MESSAGE_PORT_ID = 1,
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VMBUS_EVENT_CONNECTION_ID = 2,
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VMBUS_EVENT_PORT_ID = 2,
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VMBUS_MONITOR_CONNECTION_ID = 3,
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VMBUS_MONITOR_PORT_ID = 3,
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VMBUS_MESSAGE_SINT = 2,
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};
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2017-02-12 14:02:19 +08:00
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/*
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* Per cpu state for channel handling
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*/
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struct hv_per_cpu_context {
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void *synic_message_page;
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void *synic_event_page;
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/*
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* buffer to post messages to the host.
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*/
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void *post_msg_page;
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/*
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* Starting with win8, we can take channel interrupts on any CPU;
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* we will manage the tasklet that handles events messages on a per CPU
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* basis.
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*/
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struct tasklet_struct msg_dpc;
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/*
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* To optimize the mapping of relid to channel, maintain
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* per-cpu list of the channels based on their CPU affinity.
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*/
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struct list_head chan_list;
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struct clock_event_device *clk_evt;
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};
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2011-05-13 10:34:30 +08:00
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struct hv_context {
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/* We only support running on top of Hyper-V
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2017-03-05 09:27:17 +08:00
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* So at this point this really can only contain the Hyper-V ID
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*/
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2011-05-13 10:34:30 +08:00
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u64 guestid;
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2015-08-05 15:52:42 +08:00
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void *tsc_page;
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2011-05-13 10:34:30 +08:00
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2017-02-12 14:02:19 +08:00
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struct hv_per_cpu_context __percpu *cpu_context;
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2015-08-05 15:52:38 +08:00
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/*
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* To manage allocations in a NUMA node.
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* Array indexed by numa node ID.
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*/
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struct cpumask *hv_numa_map;
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2011-05-13 10:34:30 +08:00
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};
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extern struct hv_context hv_context;
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/* Hv Interface */
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extern int hv_init(void);
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2012-03-28 14:58:07 +08:00
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extern int hv_post_message(union hv_connection_id connection_id,
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2011-05-13 10:34:30 +08:00
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enum hv_message_type message_type,
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void *payload, size_t payload_size);
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2013-06-19 11:28:10 +08:00
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extern int hv_synic_alloc(void);
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extern void hv_synic_free(void);
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2016-12-08 06:53:11 +08:00
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extern int hv_synic_init(unsigned int cpu);
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2011-05-13 10:34:30 +08:00
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2016-12-08 06:53:11 +08:00
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extern int hv_synic_cleanup(unsigned int cpu);
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2011-05-13 10:34:30 +08:00
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2015-02-28 03:25:57 +08:00
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extern void hv_synic_clockevents_cleanup(void);
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2011-05-13 10:34:31 +08:00
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/* Interface */
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2019-03-15 04:05:15 +08:00
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void hv_ringbuffer_pre_init(struct vmbus_channel *channel);
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2011-05-13 10:34:31 +08:00
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2016-09-02 20:58:20 +08:00
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int hv_ringbuffer_init(struct hv_ring_buffer_info *ring_info,
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struct page *pages, u32 pagecnt);
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2011-05-13 10:34:31 +08:00
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void hv_ringbuffer_cleanup(struct hv_ring_buffer_info *ring_info);
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2016-11-07 05:14:17 +08:00
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int hv_ringbuffer_write(struct vmbus_channel *channel,
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2017-02-12 14:02:24 +08:00
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const struct kvec *kv_list, u32 kv_count);
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2011-05-13 10:34:31 +08:00
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2016-11-07 05:14:18 +08:00
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int hv_ringbuffer_read(struct vmbus_channel *channel,
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2015-12-15 11:02:01 +08:00
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void *buffer, u32 buflen, u32 *buffer_actual_len,
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2016-11-07 05:14:18 +08:00
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u64 *requestid, bool raw);
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2011-05-13 10:34:31 +08:00
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2011-05-13 10:34:32 +08:00
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/*
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* Maximum channels is determined by the size of the interrupt page
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* which is PAGE_SIZE. 1/2 of PAGE_SIZE is for send endpoint interrupt
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* and the other is receive endpoint interrupt
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*/
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#define MAX_NUM_CHANNELS ((PAGE_SIZE >> 1) << 3) /* 16348 channels */
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/* The value here must be in multiple of 32 */
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/* TODO: Need to make this configurable */
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#define MAX_NUM_CHANNELS_SUPPORTED 256
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enum vmbus_connect_state {
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DISCONNECTED,
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CONNECTING,
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CONNECTED,
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DISCONNECTING
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};
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#define MAX_SIZE_CHANNEL_MESSAGE HV_MESSAGE_PAYLOAD_BYTE_COUNT
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struct vmbus_connection {
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2017-05-01 07:21:18 +08:00
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/*
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* CPU on which the initial host contact was made.
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*/
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int connect_cpu;
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Drivers: hv: vmbus: enable VMBus protocol version 5.0
With VMBus protocol 5.0, we're able to better support new features, e.g.
running two or more VMBus drivers simultaneously in a single VM -- note:
we can't simply load the current VMBus driver twice, instead, a secondary
VMBus driver must be implemented.
This patch adds the support for the new VMBus protocol, which is available
on new Windows hosts, by:
1) We still use SINT2 for compatibility;
2) We must use Connection ID 4 for the Initiate Contact Message, and for
subsequent messages, we must use the Message Connection ID field in
the host-returned VersionResponse Message.
Notes for developers of the secondary VMBus driver:
1) Must use VMBus protocol 5.0 as well;
2) Must use a different SINT number that is not in use.
3) Must use Connection ID 4 for the Initiate Contact Message, and for
subsequent messages, must use the Message Connection ID field in
the host-returned VersionResponse Message.
4) It's possible that the primary VMBus driver using protocol version 4.0
can work with a secondary VMBus driver using protocol version 5.0, but it's
recommended that both should use 5.0 for new Hyper-V features in the future.
Signed-off-by: Dexuan Cui <decui@microsoft.com>
Cc: Stephen Hemminger <sthemmin@microsoft.com>
Cc: K. Y. Srinivasan <kys@microsoft.com>
Cc: Michael Kelley <mikelley@microsoft.com>
Signed-off-by: K. Y. Srinivasan <kys@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2018-05-12 17:30:33 +08:00
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u32 msg_conn_id;
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2017-05-01 07:21:18 +08:00
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atomic_t offer_in_progress;
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2011-05-13 10:34:32 +08:00
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enum vmbus_connect_state conn_state;
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atomic_t next_gpadl_handle;
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2015-04-23 12:31:32 +08:00
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struct completion unload_event;
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2011-05-13 10:34:32 +08:00
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/*
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* Represents channel interrupts. Each bit position represents a
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* channel. When a channel sends an interrupt via VMBUS, it finds its
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* bit in the sendInterruptPage, set it and calls Hv to generate a port
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* event. The other end receives the port event and parse the
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* recvInterruptPage to see which bit is set
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*/
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void *int_page;
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void *send_int_page;
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void *recv_int_page;
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/*
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* 2 pages - 1st page for parent->child notification and 2nd
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* is child->parent notification
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*/
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2013-09-14 02:32:55 +08:00
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struct hv_monitor_page *monitor_pages[2];
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2011-05-13 10:34:32 +08:00
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struct list_head chn_msg_list;
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spinlock_t channelmsg_lock;
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/* List of channels */
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struct list_head chn_list;
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2015-12-15 08:01:51 +08:00
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struct mutex channel_mutex;
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2011-05-13 10:34:32 +08:00
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Drivers: hv: vmbus: Offload the handling of channels to two workqueues
vmbus_process_offer() mustn't call channel->sc_creation_callback()
directly for sub-channels, because sc_creation_callback() ->
vmbus_open() may never get the host's response to the
OPEN_CHANNEL message (the host may rescind a channel at any time,
e.g. in the case of hot removing a NIC), and vmbus_onoffer_rescind()
may not wake up the vmbus_open() as it's blocked due to a non-zero
vmbus_connection.offer_in_progress, and finally we have a deadlock.
The above is also true for primary channels, if the related device
drivers use sync probing mode by default.
And, usually the handling of primary channels and sub-channels can
depend on each other, so we should offload them to different
workqueues to avoid possible deadlock, e.g. in sync-probing mode,
NIC1's netvsc_subchan_work() can race with NIC2's netvsc_probe() ->
rtnl_lock(), and causes deadlock: the former gets the rtnl_lock
and waits for all the sub-channels to appear, but the latter
can't get the rtnl_lock and this blocks the handling of sub-channels.
The patch can fix the multiple-NIC deadlock described above for
v3.x kernels (e.g. RHEL 7.x) which don't support async-probing
of devices, and v4.4, v4.9, v4.14 and v4.18 which support async-probing
but don't enable async-probing for Hyper-V drivers (yet).
The patch can also fix the hang issue in sub-channel's handling described
above for all versions of kernels, including v4.19 and v4.20-rc4.
So actually the patch should be applied to all the existing kernels,
not only the kernels that have 8195b1396ec8.
Fixes: 8195b1396ec8 ("hv_netvsc: fix deadlock on hotplug")
Cc: stable@vger.kernel.org
Cc: Stephen Hemminger <sthemmin@microsoft.com>
Cc: K. Y. Srinivasan <kys@microsoft.com>
Cc: Haiyang Zhang <haiyangz@microsoft.com>
Signed-off-by: Dexuan Cui <decui@microsoft.com>
Signed-off-by: K. Y. Srinivasan <kys@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2018-12-03 08:54:35 +08:00
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/*
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* An offer message is handled first on the work_queue, and then
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* is further handled on handle_primary_chan_wq or
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* handle_sub_chan_wq.
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*/
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2011-05-13 10:34:32 +08:00
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struct workqueue_struct *work_queue;
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Drivers: hv: vmbus: Offload the handling of channels to two workqueues
vmbus_process_offer() mustn't call channel->sc_creation_callback()
directly for sub-channels, because sc_creation_callback() ->
vmbus_open() may never get the host's response to the
OPEN_CHANNEL message (the host may rescind a channel at any time,
e.g. in the case of hot removing a NIC), and vmbus_onoffer_rescind()
may not wake up the vmbus_open() as it's blocked due to a non-zero
vmbus_connection.offer_in_progress, and finally we have a deadlock.
The above is also true for primary channels, if the related device
drivers use sync probing mode by default.
And, usually the handling of primary channels and sub-channels can
depend on each other, so we should offload them to different
workqueues to avoid possible deadlock, e.g. in sync-probing mode,
NIC1's netvsc_subchan_work() can race with NIC2's netvsc_probe() ->
rtnl_lock(), and causes deadlock: the former gets the rtnl_lock
and waits for all the sub-channels to appear, but the latter
can't get the rtnl_lock and this blocks the handling of sub-channels.
The patch can fix the multiple-NIC deadlock described above for
v3.x kernels (e.g. RHEL 7.x) which don't support async-probing
of devices, and v4.4, v4.9, v4.14 and v4.18 which support async-probing
but don't enable async-probing for Hyper-V drivers (yet).
The patch can also fix the hang issue in sub-channel's handling described
above for all versions of kernels, including v4.19 and v4.20-rc4.
So actually the patch should be applied to all the existing kernels,
not only the kernels that have 8195b1396ec8.
Fixes: 8195b1396ec8 ("hv_netvsc: fix deadlock on hotplug")
Cc: stable@vger.kernel.org
Cc: Stephen Hemminger <sthemmin@microsoft.com>
Cc: K. Y. Srinivasan <kys@microsoft.com>
Cc: Haiyang Zhang <haiyangz@microsoft.com>
Signed-off-by: Dexuan Cui <decui@microsoft.com>
Signed-off-by: K. Y. Srinivasan <kys@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2018-12-03 08:54:35 +08:00
|
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struct workqueue_struct *handle_primary_chan_wq;
|
|
|
|
struct workqueue_struct *handle_sub_chan_wq;
|
2011-05-13 10:34:32 +08:00
|
|
|
};
|
|
|
|
|
|
|
|
|
|
|
|
struct vmbus_msginfo {
|
|
|
|
/* Bookkeeping stuff */
|
|
|
|
struct list_head msglist_entry;
|
|
|
|
|
|
|
|
/* The message itself */
|
|
|
|
unsigned char msg[0];
|
|
|
|
};
|
|
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|
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|
|
|
|
extern struct vmbus_connection vmbus_connection;
|
|
|
|
|
2017-02-06 08:20:31 +08:00
|
|
|
static inline void vmbus_send_interrupt(u32 relid)
|
|
|
|
{
|
|
|
|
sync_set_bit(relid, vmbus_connection.send_int_page);
|
|
|
|
}
|
|
|
|
|
2015-03-28 00:10:08 +08:00
|
|
|
enum vmbus_message_handler_type {
|
|
|
|
/* The related handler can sleep. */
|
|
|
|
VMHT_BLOCKING = 0,
|
|
|
|
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|
|
/* The related handler must NOT sleep. */
|
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|
|
VMHT_NON_BLOCKING = 1,
|
|
|
|
};
|
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|
|
|
|
|
|
struct vmbus_channel_message_table_entry {
|
|
|
|
enum vmbus_channel_message_type message_type;
|
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|
|
enum vmbus_message_handler_type handler_type;
|
|
|
|
void (*message_handler)(struct vmbus_channel_message_header *msg);
|
|
|
|
};
|
|
|
|
|
2017-03-05 09:27:16 +08:00
|
|
|
extern const struct vmbus_channel_message_table_entry
|
2015-03-28 00:10:08 +08:00
|
|
|
channel_message_table[CHANNELMSG_COUNT];
|
|
|
|
|
2016-02-27 07:13:17 +08:00
|
|
|
|
2011-05-13 10:34:32 +08:00
|
|
|
/* General vmbus interface */
|
|
|
|
|
2019-01-10 22:25:32 +08:00
|
|
|
struct hv_device *vmbus_device_create(const guid_t *type,
|
|
|
|
const guid_t *instance,
|
2014-06-03 23:38:15 +08:00
|
|
|
struct vmbus_channel *channel);
|
2011-05-13 10:34:32 +08:00
|
|
|
|
2011-09-08 22:24:13 +08:00
|
|
|
int vmbus_device_register(struct hv_device *child_device_obj);
|
2011-09-08 22:24:14 +08:00
|
|
|
void vmbus_device_unregister(struct hv_device *device_obj);
|
2017-09-22 11:58:49 +08:00
|
|
|
int vmbus_add_channel_kobj(struct hv_device *device_obj,
|
|
|
|
struct vmbus_channel *channel);
|
2011-05-13 10:34:32 +08:00
|
|
|
|
2019-03-19 12:04:01 +08:00
|
|
|
void vmbus_remove_channel_attr_group(struct vmbus_channel *channel);
|
|
|
|
|
2015-03-28 00:10:09 +08:00
|
|
|
struct vmbus_channel *relid2channel(u32 relid);
|
2011-05-13 10:34:32 +08:00
|
|
|
|
2011-12-13 01:29:17 +08:00
|
|
|
void vmbus_free_channels(void);
|
2011-05-13 10:34:32 +08:00
|
|
|
|
|
|
|
/* Connection interface */
|
|
|
|
|
|
|
|
int vmbus_connect(void);
|
2015-02-28 03:25:54 +08:00
|
|
|
void vmbus_disconnect(void);
|
2011-05-13 10:34:32 +08:00
|
|
|
|
2016-12-07 17:16:24 +08:00
|
|
|
int vmbus_post_msg(void *buffer, size_t buflen, bool can_sleep);
|
2011-05-13 10:34:32 +08:00
|
|
|
|
|
|
|
void vmbus_on_event(unsigned long data);
|
2016-02-27 07:13:21 +08:00
|
|
|
void vmbus_on_msg_dpc(unsigned long data);
|
2011-05-13 10:34:32 +08:00
|
|
|
|
2017-03-05 09:27:17 +08:00
|
|
|
int hv_kvp_init(struct hv_util_service *srv);
|
2015-04-12 09:07:39 +08:00
|
|
|
void hv_kvp_deinit(void);
|
2017-03-05 09:27:17 +08:00
|
|
|
void hv_kvp_onchannelcallback(void *context);
|
2015-04-12 09:07:39 +08:00
|
|
|
|
2017-03-05 09:27:17 +08:00
|
|
|
int hv_vss_init(struct hv_util_service *srv);
|
2015-04-12 09:07:39 +08:00
|
|
|
void hv_vss_deinit(void);
|
2017-03-05 09:27:17 +08:00
|
|
|
void hv_vss_onchannelcallback(void *context);
|
2015-04-12 09:07:39 +08:00
|
|
|
|
2017-03-05 09:27:17 +08:00
|
|
|
int hv_fcopy_init(struct hv_util_service *srv);
|
2014-02-17 03:34:30 +08:00
|
|
|
void hv_fcopy_deinit(void);
|
2017-03-05 09:27:17 +08:00
|
|
|
void hv_fcopy_onchannelcallback(void *context);
|
2016-02-27 07:13:16 +08:00
|
|
|
void vmbus_initiate_unload(bool crash);
|
2014-02-17 03:34:30 +08:00
|
|
|
|
2015-04-12 09:07:41 +08:00
|
|
|
static inline void hv_poll_channel(struct vmbus_channel *channel,
|
|
|
|
void (*cb)(void *))
|
|
|
|
{
|
|
|
|
if (!channel)
|
|
|
|
return;
|
|
|
|
|
2017-05-01 07:21:17 +08:00
|
|
|
if (in_interrupt() && (channel->target_cpu == smp_processor_id())) {
|
|
|
|
cb(channel);
|
|
|
|
return;
|
|
|
|
}
|
2015-12-15 08:01:33 +08:00
|
|
|
smp_call_function_single(channel->target_cpu, cb, channel, true);
|
2015-04-12 09:07:41 +08:00
|
|
|
}
|
2011-05-13 10:34:32 +08:00
|
|
|
|
2015-04-12 09:07:46 +08:00
|
|
|
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 */
|
|
|
|
};
|
|
|
|
|
2011-05-13 10:34:28 +08:00
|
|
|
#endif /* _HYPERV_VMBUS_H */
|