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![Greg Kroah-Hartman](/assets/img/avatar_default.png)
Reorder some functions to get rid of all of the forward declarations. Cc: Hank Janssen <hjanssen@microsoft.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
311 lines
8 KiB
C
311 lines
8 KiB
C
/*
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* Copyright (c) 2009, Microsoft Corporation.
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms and conditions of the GNU General Public License,
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* version 2, as published by the Free Software Foundation.
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*
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* This program is distributed in the hope it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*
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* You should have received a copy of the GNU General Public License along with
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* this program; if not, write to the Free Software Foundation, Inc., 59 Temple
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* Place - Suite 330, Boston, MA 02111-1307 USA.
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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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*
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*/
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#include <linux/kernel.h>
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#include <linux/mm.h>
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#include "osd.h"
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#include "logging.h"
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#include "VersionInfo.h"
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#include "VmbusPrivate.h"
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static const char *gDriverName = "vmbus";
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/*
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* Windows vmbus does not defined this.
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* We defined this to be consistent with other devices
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*/
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/* {c5295816-f63a-4d5f-8d1a-4daf999ca185} */
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static const struct hv_guid gVmbusDeviceType = {
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.data = {
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0x16, 0x58, 0x29, 0xc5, 0x3a, 0xf6, 0x5f, 0x4d,
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0x8d, 0x1a, 0x4d, 0xaf, 0x99, 0x9c, 0xa1, 0x85
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}
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};
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/* {ac3760fc-9adf-40aa-9427-a70ed6de95c5} */
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static const struct hv_guid gVmbusDeviceId = {
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.data = {
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0xfc, 0x60, 0x37, 0xac, 0xdf, 0x9a, 0xaa, 0x40,
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0x94, 0x27, 0xa7, 0x0e, 0xd6, 0xde, 0x95, 0xc5
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}
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};
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static struct hv_driver *gDriver; /* vmbus driver object */
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static struct hv_device *gDevice; /* vmbus root device */
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/**
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* VmbusGetChannelOffers - Retrieve the channel offers from the parent partition
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*/
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static void VmbusGetChannelOffers(void)
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{
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DPRINT_ENTER(VMBUS);
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VmbusChannelRequestOffers();
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DPRINT_EXIT(VMBUS);
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}
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/**
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* VmbusGetChannelInterface - Get the channel interface
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*/
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static void VmbusGetChannelInterface(struct vmbus_channel_interface *Interface)
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{
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GetChannelInterface(Interface);
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}
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/**
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* VmbusGetChannelInfo - Get the device info for the specified device object
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*/
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static void VmbusGetChannelInfo(struct hv_device *DeviceObject,
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struct hv_device_info *DeviceInfo)
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{
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GetChannelInfo(DeviceObject, DeviceInfo);
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}
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/**
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* VmbusCreateChildDevice - Creates the child device on the bus that represents the channel offer
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*/
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struct hv_device *VmbusChildDeviceCreate(struct hv_guid *DeviceType,
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struct hv_guid *DeviceInstance,
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void *Context)
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{
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struct vmbus_driver *vmbusDriver = (struct vmbus_driver *)gDriver;
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return vmbusDriver->OnChildDeviceCreate(DeviceType, DeviceInstance,
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Context);
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}
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/**
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* VmbusChildDeviceAdd - Registers the child device with the vmbus
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*/
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int VmbusChildDeviceAdd(struct hv_device *ChildDevice)
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{
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struct vmbus_driver *vmbusDriver = (struct vmbus_driver *)gDriver;
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return vmbusDriver->OnChildDeviceAdd(gDevice, ChildDevice);
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}
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/**
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* VmbusChildDeviceRemove Unregisters the child device from the vmbus
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*/
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void VmbusChildDeviceRemove(struct hv_device *ChildDevice)
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{
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struct vmbus_driver *vmbusDriver = (struct vmbus_driver *)gDriver;
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vmbusDriver->OnChildDeviceRemove(ChildDevice);
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}
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/**
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* VmbusOnDeviceAdd - Callback when the root bus device is added
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*/
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static int VmbusOnDeviceAdd(struct hv_device *dev, void *AdditionalInfo)
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{
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u32 *irqvector = AdditionalInfo;
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int ret;
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DPRINT_ENTER(VMBUS);
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gDevice = dev;
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memcpy(&gDevice->deviceType, &gVmbusDeviceType, sizeof(struct hv_guid));
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memcpy(&gDevice->deviceInstance, &gVmbusDeviceId,
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sizeof(struct hv_guid));
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/* strcpy(dev->name, "vmbus"); */
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/* SynIC setup... */
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ret = HvSynicInit(*irqvector);
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/* Connect to VMBus in the root partition */
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ret = VmbusConnect();
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/* VmbusSendEvent(device->localPortId+1); */
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DPRINT_EXIT(VMBUS);
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return ret;
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}
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/**
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* VmbusOnDeviceRemove - Callback when the root bus device is removed
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*/
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static int VmbusOnDeviceRemove(struct hv_device *dev)
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{
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int ret = 0;
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DPRINT_ENTER(VMBUS);
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VmbusChannelReleaseUnattachedChannels();
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VmbusDisconnect();
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HvSynicCleanup();
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DPRINT_EXIT(VMBUS);
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return ret;
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}
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/**
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* VmbusOnCleanup - Perform any cleanup when the driver is removed
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*/
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static void VmbusOnCleanup(struct hv_driver *drv)
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{
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/* struct vmbus_driver *driver = (struct vmbus_driver *)drv; */
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DPRINT_ENTER(VMBUS);
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HvCleanup();
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DPRINT_EXIT(VMBUS);
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}
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/**
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* VmbusOnMsgDPC - DPC routine to handle messages from the hypervisior
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*/
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static void VmbusOnMsgDPC(struct hv_driver *drv)
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{
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void *page_addr = gHvContext.synICMessagePage[0];
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struct hv_message *msg = (struct hv_message *)page_addr +
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VMBUS_MESSAGE_SINT;
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struct hv_message *copied;
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while (1) {
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if (msg->Header.MessageType == HvMessageTypeNone) {
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/* no msg */
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break;
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} else {
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copied = kmalloc(sizeof(*copied), GFP_ATOMIC);
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if (copied == NULL)
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continue;
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memcpy(copied, msg, sizeof(*copied));
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osd_schedule_callback(gVmbusConnection.WorkQueue,
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VmbusOnChannelMessage,
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(void *)copied);
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}
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msg->Header.MessageType = HvMessageTypeNone;
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/*
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* Make sure the write to MessageType (ie set to
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* HvMessageTypeNone) happens before we read the
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* MessagePending and EOMing. Otherwise, the EOMing
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* will not deliver any more messages since there is
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* no empty slot
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*/
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mb();
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if (msg->Header.MessageFlags.MessagePending) {
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/*
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* This will cause message queue rescan to
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* possibly deliver another msg from the
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* hypervisor
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*/
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wrmsrl(HV_X64_MSR_EOM, 0);
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}
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}
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}
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/**
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* VmbusOnEventDPC - DPC routine to handle events from the hypervisior
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*/
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static void VmbusOnEventDPC(struct hv_driver *drv)
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{
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/* TODO: Process any events */
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VmbusOnEvents();
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}
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/**
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* VmbusOnISR - ISR routine
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*/
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static int VmbusOnISR(struct hv_driver *drv)
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{
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int ret = 0;
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void *page_addr;
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struct hv_message *msg;
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union hv_synic_event_flags *event;
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page_addr = gHvContext.synICMessagePage[0];
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msg = (struct hv_message *)page_addr + VMBUS_MESSAGE_SINT;
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DPRINT_ENTER(VMBUS);
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/* Check if there are actual msgs to be process */
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if (msg->Header.MessageType != HvMessageTypeNone) {
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DPRINT_DBG(VMBUS, "received msg type %d size %d",
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msg->Header.MessageType,
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msg->Header.PayloadSize);
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ret |= 0x1;
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}
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/* TODO: Check if there are events to be process */
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page_addr = gHvContext.synICEventPage[0];
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event = (union hv_synic_event_flags *)page_addr + VMBUS_MESSAGE_SINT;
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/* Since we are a child, we only need to check bit 0 */
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if (test_and_clear_bit(0, (unsigned long *) &event->Flags32[0])) {
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DPRINT_DBG(VMBUS, "received event %d", event->Flags32[0]);
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ret |= 0x2;
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}
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DPRINT_EXIT(VMBUS);
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return ret;
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}
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/**
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* VmbusInitialize - Main entry point
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*/
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int VmbusInitialize(struct hv_driver *drv)
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{
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struct vmbus_driver *driver = (struct vmbus_driver *)drv;
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int ret;
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DPRINT_ENTER(VMBUS);
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DPRINT_INFO(VMBUS, "+++++++ Build Date=%s %s +++++++",
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VersionDate, VersionTime);
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DPRINT_INFO(VMBUS, "+++++++ Build Description=%s +++++++",
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VersionDesc);
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DPRINT_INFO(VMBUS, "+++++++ Vmbus supported version = %d +++++++",
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VMBUS_REVISION_NUMBER);
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DPRINT_INFO(VMBUS, "+++++++ Vmbus using SINT %d +++++++",
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VMBUS_MESSAGE_SINT);
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DPRINT_DBG(VMBUS, "sizeof(VMBUS_CHANNEL_PACKET_PAGE_BUFFER)=%zd, "
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"sizeof(VMBUS_CHANNEL_PACKET_MULITPAGE_BUFFER)=%zd",
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sizeof(struct VMBUS_CHANNEL_PACKET_PAGE_BUFFER),
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sizeof(struct VMBUS_CHANNEL_PACKET_MULITPAGE_BUFFER));
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drv->name = gDriverName;
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memcpy(&drv->deviceType, &gVmbusDeviceType, sizeof(struct hv_guid));
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/* Setup dispatch table */
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driver->Base.OnDeviceAdd = VmbusOnDeviceAdd;
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driver->Base.OnDeviceRemove = VmbusOnDeviceRemove;
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driver->Base.OnCleanup = VmbusOnCleanup;
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driver->OnIsr = VmbusOnISR;
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driver->OnMsgDpc = VmbusOnMsgDPC;
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driver->OnEventDpc = VmbusOnEventDPC;
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driver->GetChannelOffers = VmbusGetChannelOffers;
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driver->GetChannelInterface = VmbusGetChannelInterface;
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driver->GetChannelInfo = VmbusGetChannelInfo;
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/* Hypervisor initialization...setup hypercall page..etc */
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ret = HvInit();
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if (ret != 0)
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DPRINT_ERR(VMBUS, "Unable to initialize the hypervisor - 0x%x",
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ret);
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gDriver = drv;
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DPRINT_EXIT(VMBUS);
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return ret;
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}
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