mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-05 19:56:41 +07:00
3b20eb2372
Based on 1 normalized pattern(s): 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 extracted by the scancode license scanner the SPDX license identifier GPL-2.0-only has been chosen to replace the boilerplate/reference in 33 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Allison Randal <allison@lohutok.net> Reviewed-by: Kate Stewart <kstewart@linuxfoundation.org> Reviewed-by: Alexios Zavras <alexios.zavras@intel.com> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190530000435.254582722@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
468 lines
12 KiB
C
468 lines
12 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
|
|
/*
|
|
*
|
|
* Copyright (c) 2009, Microsoft Corporation.
|
|
*
|
|
* Authors:
|
|
* Haiyang Zhang <haiyangz@microsoft.com>
|
|
* Hank Janssen <hjanssen@microsoft.com>
|
|
*/
|
|
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
|
|
|
|
#include <linux/kernel.h>
|
|
#include <linux/sched.h>
|
|
#include <linux/wait.h>
|
|
#include <linux/delay.h>
|
|
#include <linux/mm.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/vmalloc.h>
|
|
#include <linux/hyperv.h>
|
|
#include <linux/export.h>
|
|
#include <asm/mshyperv.h>
|
|
|
|
#include "hyperv_vmbus.h"
|
|
|
|
|
|
struct vmbus_connection vmbus_connection = {
|
|
.conn_state = DISCONNECTED,
|
|
.next_gpadl_handle = ATOMIC_INIT(0xE1E10),
|
|
};
|
|
EXPORT_SYMBOL_GPL(vmbus_connection);
|
|
|
|
/*
|
|
* Negotiated protocol version with the host.
|
|
*/
|
|
__u32 vmbus_proto_version;
|
|
EXPORT_SYMBOL_GPL(vmbus_proto_version);
|
|
|
|
static __u32 vmbus_get_next_version(__u32 current_version)
|
|
{
|
|
switch (current_version) {
|
|
case (VERSION_WIN7):
|
|
return VERSION_WS2008;
|
|
|
|
case (VERSION_WIN8):
|
|
return VERSION_WIN7;
|
|
|
|
case (VERSION_WIN8_1):
|
|
return VERSION_WIN8;
|
|
|
|
case (VERSION_WIN10):
|
|
return VERSION_WIN8_1;
|
|
|
|
case (VERSION_WIN10_V5):
|
|
return VERSION_WIN10;
|
|
|
|
case (VERSION_WS2008):
|
|
default:
|
|
return VERSION_INVAL;
|
|
}
|
|
}
|
|
|
|
static int vmbus_negotiate_version(struct vmbus_channel_msginfo *msginfo,
|
|
__u32 version)
|
|
{
|
|
int ret = 0;
|
|
unsigned int cur_cpu;
|
|
struct vmbus_channel_initiate_contact *msg;
|
|
unsigned long flags;
|
|
|
|
init_completion(&msginfo->waitevent);
|
|
|
|
msg = (struct vmbus_channel_initiate_contact *)msginfo->msg;
|
|
|
|
memset(msg, 0, sizeof(*msg));
|
|
msg->header.msgtype = CHANNELMSG_INITIATE_CONTACT;
|
|
msg->vmbus_version_requested = version;
|
|
|
|
/*
|
|
* VMBus protocol 5.0 (VERSION_WIN10_V5) requires that we must use
|
|
* VMBUS_MESSAGE_CONNECTION_ID_4 for the Initiate Contact Message,
|
|
* and for subsequent messages, we must use the Message Connection ID
|
|
* field in the host-returned Version Response Message. And, with
|
|
* VERSION_WIN10_V5, we don't use msg->interrupt_page, but we tell
|
|
* the host explicitly that we still use VMBUS_MESSAGE_SINT(2) for
|
|
* compatibility.
|
|
*
|
|
* On old hosts, we should always use VMBUS_MESSAGE_CONNECTION_ID (1).
|
|
*/
|
|
if (version >= VERSION_WIN10_V5) {
|
|
msg->msg_sint = VMBUS_MESSAGE_SINT;
|
|
vmbus_connection.msg_conn_id = VMBUS_MESSAGE_CONNECTION_ID_4;
|
|
} else {
|
|
msg->interrupt_page = virt_to_phys(vmbus_connection.int_page);
|
|
vmbus_connection.msg_conn_id = VMBUS_MESSAGE_CONNECTION_ID;
|
|
}
|
|
|
|
msg->monitor_page1 = virt_to_phys(vmbus_connection.monitor_pages[0]);
|
|
msg->monitor_page2 = virt_to_phys(vmbus_connection.monitor_pages[1]);
|
|
/*
|
|
* We want all channel messages to be delivered on CPU 0.
|
|
* This has been the behavior pre-win8. This is not
|
|
* perf issue and having all channel messages delivered on CPU 0
|
|
* would be ok.
|
|
* For post win8 hosts, we support receiving channel messagges on
|
|
* all the CPUs. This is needed for kexec to work correctly where
|
|
* the CPU attempting to connect may not be CPU 0.
|
|
*/
|
|
if (version >= VERSION_WIN8_1) {
|
|
cur_cpu = get_cpu();
|
|
msg->target_vcpu = hv_cpu_number_to_vp_number(cur_cpu);
|
|
vmbus_connection.connect_cpu = cur_cpu;
|
|
put_cpu();
|
|
} else {
|
|
msg->target_vcpu = 0;
|
|
vmbus_connection.connect_cpu = 0;
|
|
}
|
|
|
|
/*
|
|
* Add to list before we send the request since we may
|
|
* receive the response before returning from this routine
|
|
*/
|
|
spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags);
|
|
list_add_tail(&msginfo->msglistentry,
|
|
&vmbus_connection.chn_msg_list);
|
|
|
|
spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags);
|
|
|
|
ret = vmbus_post_msg(msg,
|
|
sizeof(struct vmbus_channel_initiate_contact),
|
|
true);
|
|
|
|
trace_vmbus_negotiate_version(msg, ret);
|
|
|
|
if (ret != 0) {
|
|
spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags);
|
|
list_del(&msginfo->msglistentry);
|
|
spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock,
|
|
flags);
|
|
return ret;
|
|
}
|
|
|
|
/* Wait for the connection response */
|
|
wait_for_completion(&msginfo->waitevent);
|
|
|
|
spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags);
|
|
list_del(&msginfo->msglistentry);
|
|
spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags);
|
|
|
|
/* Check if successful */
|
|
if (msginfo->response.version_response.version_supported) {
|
|
vmbus_connection.conn_state = CONNECTED;
|
|
|
|
if (version >= VERSION_WIN10_V5)
|
|
vmbus_connection.msg_conn_id =
|
|
msginfo->response.version_response.msg_conn_id;
|
|
} else {
|
|
return -ECONNREFUSED;
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* vmbus_connect - Sends a connect request on the partition service connection
|
|
*/
|
|
int vmbus_connect(void)
|
|
{
|
|
int ret = 0;
|
|
struct vmbus_channel_msginfo *msginfo = NULL;
|
|
__u32 version;
|
|
|
|
/* Initialize the vmbus connection */
|
|
vmbus_connection.conn_state = CONNECTING;
|
|
vmbus_connection.work_queue = create_workqueue("hv_vmbus_con");
|
|
if (!vmbus_connection.work_queue) {
|
|
ret = -ENOMEM;
|
|
goto cleanup;
|
|
}
|
|
|
|
vmbus_connection.handle_primary_chan_wq =
|
|
create_workqueue("hv_pri_chan");
|
|
if (!vmbus_connection.handle_primary_chan_wq) {
|
|
ret = -ENOMEM;
|
|
goto cleanup;
|
|
}
|
|
|
|
vmbus_connection.handle_sub_chan_wq =
|
|
create_workqueue("hv_sub_chan");
|
|
if (!vmbus_connection.handle_sub_chan_wq) {
|
|
ret = -ENOMEM;
|
|
goto cleanup;
|
|
}
|
|
|
|
INIT_LIST_HEAD(&vmbus_connection.chn_msg_list);
|
|
spin_lock_init(&vmbus_connection.channelmsg_lock);
|
|
|
|
INIT_LIST_HEAD(&vmbus_connection.chn_list);
|
|
mutex_init(&vmbus_connection.channel_mutex);
|
|
|
|
/*
|
|
* Setup the vmbus event connection for channel interrupt
|
|
* abstraction stuff
|
|
*/
|
|
vmbus_connection.int_page =
|
|
(void *)__get_free_pages(GFP_KERNEL|__GFP_ZERO, 0);
|
|
if (vmbus_connection.int_page == NULL) {
|
|
ret = -ENOMEM;
|
|
goto cleanup;
|
|
}
|
|
|
|
vmbus_connection.recv_int_page = vmbus_connection.int_page;
|
|
vmbus_connection.send_int_page =
|
|
(void *)((unsigned long)vmbus_connection.int_page +
|
|
(PAGE_SIZE >> 1));
|
|
|
|
/*
|
|
* Setup the monitor notification facility. The 1st page for
|
|
* parent->child and the 2nd page for child->parent
|
|
*/
|
|
vmbus_connection.monitor_pages[0] = (void *)__get_free_pages((GFP_KERNEL|__GFP_ZERO), 0);
|
|
vmbus_connection.monitor_pages[1] = (void *)__get_free_pages((GFP_KERNEL|__GFP_ZERO), 0);
|
|
if ((vmbus_connection.monitor_pages[0] == NULL) ||
|
|
(vmbus_connection.monitor_pages[1] == NULL)) {
|
|
ret = -ENOMEM;
|
|
goto cleanup;
|
|
}
|
|
|
|
msginfo = kzalloc(sizeof(*msginfo) +
|
|
sizeof(struct vmbus_channel_initiate_contact),
|
|
GFP_KERNEL);
|
|
if (msginfo == NULL) {
|
|
ret = -ENOMEM;
|
|
goto cleanup;
|
|
}
|
|
|
|
/*
|
|
* Negotiate a compatible VMBUS version number with the
|
|
* host. We start with the highest number we can support
|
|
* and work our way down until we negotiate a compatible
|
|
* version.
|
|
*/
|
|
|
|
version = VERSION_CURRENT;
|
|
|
|
do {
|
|
ret = vmbus_negotiate_version(msginfo, version);
|
|
if (ret == -ETIMEDOUT)
|
|
goto cleanup;
|
|
|
|
if (vmbus_connection.conn_state == CONNECTED)
|
|
break;
|
|
|
|
version = vmbus_get_next_version(version);
|
|
} while (version != VERSION_INVAL);
|
|
|
|
if (version == VERSION_INVAL)
|
|
goto cleanup;
|
|
|
|
vmbus_proto_version = version;
|
|
pr_info("Vmbus version:%d.%d\n",
|
|
version >> 16, version & 0xFFFF);
|
|
|
|
kfree(msginfo);
|
|
return 0;
|
|
|
|
cleanup:
|
|
pr_err("Unable to connect to host\n");
|
|
|
|
vmbus_connection.conn_state = DISCONNECTED;
|
|
vmbus_disconnect();
|
|
|
|
kfree(msginfo);
|
|
|
|
return ret;
|
|
}
|
|
|
|
void vmbus_disconnect(void)
|
|
{
|
|
/*
|
|
* First send the unload request to the host.
|
|
*/
|
|
vmbus_initiate_unload(false);
|
|
|
|
if (vmbus_connection.handle_sub_chan_wq)
|
|
destroy_workqueue(vmbus_connection.handle_sub_chan_wq);
|
|
|
|
if (vmbus_connection.handle_primary_chan_wq)
|
|
destroy_workqueue(vmbus_connection.handle_primary_chan_wq);
|
|
|
|
if (vmbus_connection.work_queue)
|
|
destroy_workqueue(vmbus_connection.work_queue);
|
|
|
|
if (vmbus_connection.int_page) {
|
|
free_pages((unsigned long)vmbus_connection.int_page, 0);
|
|
vmbus_connection.int_page = NULL;
|
|
}
|
|
|
|
free_pages((unsigned long)vmbus_connection.monitor_pages[0], 0);
|
|
free_pages((unsigned long)vmbus_connection.monitor_pages[1], 0);
|
|
vmbus_connection.monitor_pages[0] = NULL;
|
|
vmbus_connection.monitor_pages[1] = NULL;
|
|
}
|
|
|
|
/*
|
|
* relid2channel - Get the channel object given its
|
|
* child relative id (ie channel id)
|
|
*/
|
|
struct vmbus_channel *relid2channel(u32 relid)
|
|
{
|
|
struct vmbus_channel *channel;
|
|
struct vmbus_channel *found_channel = NULL;
|
|
struct list_head *cur, *tmp;
|
|
struct vmbus_channel *cur_sc;
|
|
|
|
BUG_ON(!mutex_is_locked(&vmbus_connection.channel_mutex));
|
|
|
|
list_for_each_entry(channel, &vmbus_connection.chn_list, listentry) {
|
|
if (channel->offermsg.child_relid == relid) {
|
|
found_channel = channel;
|
|
break;
|
|
} else if (!list_empty(&channel->sc_list)) {
|
|
/*
|
|
* Deal with sub-channels.
|
|
*/
|
|
list_for_each_safe(cur, tmp, &channel->sc_list) {
|
|
cur_sc = list_entry(cur, struct vmbus_channel,
|
|
sc_list);
|
|
if (cur_sc->offermsg.child_relid == relid) {
|
|
found_channel = cur_sc;
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
return found_channel;
|
|
}
|
|
|
|
/*
|
|
* vmbus_on_event - Process a channel event notification
|
|
*
|
|
* For batched channels (default) 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.
|
|
* If this tasklet has been running for a long time
|
|
* then reschedule ourselves.
|
|
*/
|
|
void vmbus_on_event(unsigned long data)
|
|
{
|
|
struct vmbus_channel *channel = (void *) data;
|
|
unsigned long time_limit = jiffies + 2;
|
|
|
|
trace_vmbus_on_event(channel);
|
|
|
|
do {
|
|
void (*callback_fn)(void *);
|
|
|
|
/* A channel once created is persistent even when
|
|
* there is no driver handling the device. An
|
|
* unloading driver sets the onchannel_callback to NULL.
|
|
*/
|
|
callback_fn = READ_ONCE(channel->onchannel_callback);
|
|
if (unlikely(callback_fn == NULL))
|
|
return;
|
|
|
|
(*callback_fn)(channel->channel_callback_context);
|
|
|
|
if (channel->callback_mode != HV_CALL_BATCHED)
|
|
return;
|
|
|
|
if (likely(hv_end_read(&channel->inbound) == 0))
|
|
return;
|
|
|
|
hv_begin_read(&channel->inbound);
|
|
} while (likely(time_before(jiffies, time_limit)));
|
|
|
|
/* The time limit (2 jiffies) has been reached */
|
|
tasklet_schedule(&channel->callback_event);
|
|
}
|
|
|
|
/*
|
|
* vmbus_post_msg - Send a msg on the vmbus's message connection
|
|
*/
|
|
int vmbus_post_msg(void *buffer, size_t buflen, bool can_sleep)
|
|
{
|
|
struct vmbus_channel_message_header *hdr;
|
|
union hv_connection_id conn_id;
|
|
int ret = 0;
|
|
int retries = 0;
|
|
u32 usec = 1;
|
|
|
|
conn_id.asu32 = 0;
|
|
conn_id.u.id = vmbus_connection.msg_conn_id;
|
|
|
|
/*
|
|
* hv_post_message() can have transient failures because of
|
|
* insufficient resources. Retry the operation a couple of
|
|
* times before giving up.
|
|
*/
|
|
while (retries < 100) {
|
|
ret = hv_post_message(conn_id, 1, buffer, buflen);
|
|
|
|
switch (ret) {
|
|
case HV_STATUS_INVALID_CONNECTION_ID:
|
|
/*
|
|
* See vmbus_negotiate_version(): VMBus protocol 5.0
|
|
* requires that we must use
|
|
* VMBUS_MESSAGE_CONNECTION_ID_4 for the Initiate
|
|
* Contact message, but on old hosts that only
|
|
* support VMBus protocol 4.0 or lower, here we get
|
|
* HV_STATUS_INVALID_CONNECTION_ID and we should
|
|
* return an error immediately without retrying.
|
|
*/
|
|
hdr = buffer;
|
|
if (hdr->msgtype == CHANNELMSG_INITIATE_CONTACT)
|
|
return -EINVAL;
|
|
/*
|
|
* We could get this if we send messages too
|
|
* frequently.
|
|
*/
|
|
ret = -EAGAIN;
|
|
break;
|
|
case HV_STATUS_INSUFFICIENT_MEMORY:
|
|
case HV_STATUS_INSUFFICIENT_BUFFERS:
|
|
ret = -ENOBUFS;
|
|
break;
|
|
case HV_STATUS_SUCCESS:
|
|
return ret;
|
|
default:
|
|
pr_err("hv_post_msg() failed; error code:%d\n", ret);
|
|
return -EINVAL;
|
|
}
|
|
|
|
retries++;
|
|
if (can_sleep && usec > 1000)
|
|
msleep(usec / 1000);
|
|
else if (usec < MAX_UDELAY_MS * 1000)
|
|
udelay(usec);
|
|
else
|
|
mdelay(usec / 1000);
|
|
|
|
if (retries < 22)
|
|
usec *= 2;
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* vmbus_set_event - Send an event notification to the parent
|
|
*/
|
|
void vmbus_set_event(struct vmbus_channel *channel)
|
|
{
|
|
u32 child_relid = channel->offermsg.child_relid;
|
|
|
|
if (!channel->is_dedicated_interrupt)
|
|
vmbus_send_interrupt(child_relid);
|
|
|
|
++channel->sig_events;
|
|
|
|
hv_do_fast_hypercall8(HVCALL_SIGNAL_EVENT, channel->sig_event);
|
|
}
|
|
EXPORT_SYMBOL_GPL(vmbus_set_event);
|