diff options
Diffstat (limited to 'drivers/staging/hv/Vmbus.c')
-rw-r--r-- | drivers/staging/hv/Vmbus.c | 524 |
1 files changed, 524 insertions, 0 deletions
diff --git a/drivers/staging/hv/Vmbus.c b/drivers/staging/hv/Vmbus.c new file mode 100644 index 000000000000..fa8c58f57829 --- /dev/null +++ b/drivers/staging/hv/Vmbus.c @@ -0,0 +1,524 @@ +/* + * + * Copyright (c) 2009, 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> + * + */ + +#include <linux/kernel.h> +#include <linux/mm.h> +#include "include/logging.h" +#include "VersionInfo.h" +#include "VmbusPrivate.h" + + +/* Globals */ + +static const char* gDriverName="vmbus"; + +/* Windows vmbus does not defined this. + * We defined this to be consistent with other devices + */ +/* {c5295816-f63a-4d5f-8d1a-4daf999ca185} */ +static const GUID gVmbusDeviceType={ + .Data = {0x16, 0x58, 0x29, 0xc5, 0x3a, 0xf6, 0x5f, 0x4d, 0x8d, 0x1a, 0x4d, 0xaf, 0x99, 0x9c, 0xa1, 0x85} +}; + +/* {ac3760fc-9adf-40aa-9427-a70ed6de95c5} */ +static const GUID gVmbusDeviceId={ + .Data = {0xfc, 0x60, 0x37, 0xac, 0xdf, 0x9a, 0xaa, 0x40, 0x94, 0x27, 0xa7, 0x0e, 0xd6, 0xde, 0x95, 0xc5} +}; + +static struct hv_driver *gDriver; /* vmbus driver object */ +static struct hv_device* gDevice; /* vmbus root device */ + + + +/* Internal routines */ + + +static void +VmbusGetChannelInterface( + VMBUS_CHANNEL_INTERFACE *Interface + ); + +static void +VmbusGetChannelInfo( + struct hv_device *DeviceObject, + DEVICE_INFO *DeviceInfo + ); + +static void +VmbusGetChannelOffers( + void + ); + +static int +VmbusOnDeviceAdd( + struct hv_device *Device, + void *AdditionalInfo + ); + +static int +VmbusOnDeviceRemove( + struct hv_device *dev + ); + +static void +VmbusOnCleanup( + struct hv_driver *drv + ); + +static int +VmbusOnISR( + struct hv_driver *drv + ); + +static void +VmbusOnMsgDPC( + struct hv_driver *drv + ); + +static void +VmbusOnEventDPC( + struct hv_driver *drv + ); + +/*++; + +Name: + VmbusInitialize() + +Description: + Main entry point + +--*/ +int +VmbusInitialize( + struct hv_driver *drv + ) +{ + VMBUS_DRIVER_OBJECT* driver = (VMBUS_DRIVER_OBJECT*)drv; + int ret=0; + + DPRINT_ENTER(VMBUS); + + DPRINT_INFO(VMBUS, "+++++++ Build Date=%s %s +++++++", VersionDate, VersionTime); + DPRINT_INFO(VMBUS, "+++++++ Build Description=%s +++++++", VersionDesc); + + DPRINT_INFO(VMBUS, "+++++++ Vmbus supported version = %d +++++++", VMBUS_REVISION_NUMBER); + DPRINT_INFO(VMBUS, "+++++++ Vmbus using SINT %d +++++++", VMBUS_MESSAGE_SINT); + + DPRINT_DBG(VMBUS, "sizeof(VMBUS_CHANNEL_PACKET_PAGE_BUFFER)=%zd, sizeof(VMBUS_CHANNEL_PACKET_MULITPAGE_BUFFER)=%zd", + sizeof(struct VMBUS_CHANNEL_PACKET_PAGE_BUFFER), sizeof(struct VMBUS_CHANNEL_PACKET_MULITPAGE_BUFFER)); + + drv->name = gDriverName; + memcpy(&drv->deviceType, &gVmbusDeviceType, sizeof(GUID)); + + /* Setup dispatch table */ + driver->Base.OnDeviceAdd = VmbusOnDeviceAdd; + driver->Base.OnDeviceRemove = VmbusOnDeviceRemove; + driver->Base.OnCleanup = VmbusOnCleanup; + driver->OnIsr = VmbusOnISR; + driver->OnMsgDpc = VmbusOnMsgDPC; + driver->OnEventDpc = VmbusOnEventDPC; + driver->GetChannelOffers = VmbusGetChannelOffers; + driver->GetChannelInterface = VmbusGetChannelInterface; + driver->GetChannelInfo = VmbusGetChannelInfo; + + /* Hypervisor initialization...setup hypercall page..etc */ + ret = HvInit(); + if (ret != 0) + { + DPRINT_ERR(VMBUS, "Unable to initialize the hypervisor - 0x%x", ret); + } + + gDriver = drv; + + DPRINT_EXIT(VMBUS); + + return ret; +} + + +/*++; + +Name: + VmbusGetChannelOffers() + +Description: + Retrieve the channel offers from the parent partition + +--*/ + +static void +VmbusGetChannelOffers(void) +{ + DPRINT_ENTER(VMBUS); + VmbusChannelRequestOffers(); + DPRINT_EXIT(VMBUS); +} + + +/*++; + +Name: + VmbusGetChannelInterface() + +Description: + Get the channel interface + +--*/ +static void +VmbusGetChannelInterface( + VMBUS_CHANNEL_INTERFACE *Interface + ) +{ + GetChannelInterface(Interface); +} + + +/*++; + +Name: + VmbusGetChannelInterface() + +Description: + Get the device info for the specified device object + +--*/ +static void +VmbusGetChannelInfo( + struct hv_device *DeviceObject, + DEVICE_INFO *DeviceInfo + ) +{ + GetChannelInfo(DeviceObject, DeviceInfo); +} + + + +/*++ + +Name: + VmbusCreateChildDevice() + +Description: + Creates the child device on the bus that represents the channel offer + +--*/ + +static struct hv_device* +VmbusChildDeviceCreate( + GUID DeviceType, + GUID DeviceInstance, + void *Context) +{ + VMBUS_DRIVER_OBJECT* vmbusDriver = (VMBUS_DRIVER_OBJECT*)gDriver; + + return vmbusDriver->OnChildDeviceCreate( + DeviceType, + DeviceInstance, + Context); +} + + +/*++ + +Name: + VmbusChildDeviceAdd() + +Description: + Registers the child device with the vmbus + +--*/ +static int +VmbusChildDeviceAdd( + struct hv_device *ChildDevice) +{ + VMBUS_DRIVER_OBJECT* vmbusDriver = (VMBUS_DRIVER_OBJECT*)gDriver; + + return vmbusDriver->OnChildDeviceAdd(gDevice, ChildDevice); +} + + +/*++ + +Name: + VmbusChildDeviceRemove() + +Description: + Unregisters the child device from the vmbus + +--*/ +static void +VmbusChildDeviceRemove( + struct hv_device *ChildDevice) +{ + VMBUS_DRIVER_OBJECT* vmbusDriver = (VMBUS_DRIVER_OBJECT*)gDriver; + + vmbusDriver->OnChildDeviceRemove(ChildDevice); +} + +/*++ + +Name: + VmbusChildDeviceDestroy() + +Description: + Release the child device from the vmbus + +--*/ + +/* ************** +void +VmbusChildDeviceDestroy( +struct hv_device *ChildDevice +) +{ +VMBUS_DRIVER_OBJECT* vmbusDriver = (VMBUS_DRIVER_OBJECT*)gDriver; + +vmbusDriver->OnChildDeviceDestroy(ChildDevice); +} +************* */ + +/*++ + +Name: + VmbusOnDeviceAdd() + +Description: + Callback when the root bus device is added + +--*/ +static int +VmbusOnDeviceAdd( + struct hv_device *dev, + void *AdditionalInfo + ) +{ + u32 *irqvector = (u32*) AdditionalInfo; + int ret=0; + + DPRINT_ENTER(VMBUS); + + gDevice = dev; + + memcpy(&gDevice->deviceType, &gVmbusDeviceType, sizeof(GUID)); + memcpy(&gDevice->deviceInstance, &gVmbusDeviceId, sizeof(GUID)); + + /* strcpy(dev->name, "vmbus"); */ + /* SynIC setup... */ + ret = HvSynicInit(*irqvector); + + /* Connect to VMBus in the root partition */ + ret = VmbusConnect(); + + /* VmbusSendEvent(device->localPortId+1); */ + DPRINT_EXIT(VMBUS); + + return ret; +} + + +/*++ + +Name: + VmbusOnDeviceRemove() + +Description: + Callback when the root bus device is removed + +--*/ +static int VmbusOnDeviceRemove( + struct hv_device *dev + ) +{ + int ret=0; + + DPRINT_ENTER(VMBUS); + + VmbusChannelReleaseUnattachedChannels(); + + VmbusDisconnect(); + + HvSynicCleanup(); + + DPRINT_EXIT(VMBUS); + + return ret; +} + + +/*++ + +Name: + VmbusOnCleanup() + +Description: + Perform any cleanup when the driver is removed + +--*/ +static void +VmbusOnCleanup( + struct hv_driver *drv + ) +{ + /* VMBUS_DRIVER_OBJECT* driver = (VMBUS_DRIVER_OBJECT*)drv; */ + + DPRINT_ENTER(VMBUS); + + HvCleanup(); + + DPRINT_EXIT(VMBUS); +} + + +/*++ + +Name: + VmbusOnMsgDPC() + +Description: + DPC routine to handle messages from the hypervisior + +--*/ +static void +VmbusOnMsgDPC( + struct hv_driver *drv + ) +{ + void *page_addr = gHvContext.synICMessagePage[0]; + + HV_MESSAGE* msg = (HV_MESSAGE*)page_addr + VMBUS_MESSAGE_SINT; + HV_MESSAGE *copied; + while (1) + { + if (msg->Header.MessageType == HvMessageTypeNone) /* no msg */ + { + break; + } + else + { + copied = kmalloc(sizeof(HV_MESSAGE), GFP_ATOMIC); + if (copied == NULL) + { + continue; + } + + memcpy(copied, msg, sizeof(HV_MESSAGE)); + osd_schedule_callback(gVmbusConnection.WorkQueue, + VmbusOnChannelMessage, + (void *)copied); + } + + msg->Header.MessageType = HvMessageTypeNone; + + /* + * Make sure the write to MessageType (ie set to + * HvMessageTypeNone) 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.MessageFlags.MessagePending) + { + /* + * This will cause message queue rescan to + * possibly deliver another msg from the + * hypervisor + */ + WriteMsr(HV_X64_MSR_EOM, 0); + } + } +} + +/*++ + +Name: + VmbusOnEventDPC() + +Description: + DPC routine to handle events from the hypervisior + +--*/ +static void +VmbusOnEventDPC( + struct hv_driver* drv + ) +{ + /* TODO: Process any events */ + VmbusOnEvents(); +} + + +/*++ + +Name: + VmbusOnISR() + +Description: + ISR routine + +--*/ +static int +VmbusOnISR( + struct hv_driver *drv + ) +{ + /* VMBUS_DRIVER_OBJECT* driver = (VMBUS_DRIVER_OBJECT*)drv; */ + + int ret=0; + /* struct page* page; */ + void *page_addr; + HV_MESSAGE* msg; + HV_SYNIC_EVENT_FLAGS* event; + + /* page = SynICMessagePage[0]; */ + /* page_addr = page_address(page); */ + page_addr = gHvContext.synICMessagePage[0]; + msg = (HV_MESSAGE*)page_addr + VMBUS_MESSAGE_SINT; + + DPRINT_ENTER(VMBUS); + + /* Check if there are actual msgs to be process */ + if (msg->Header.MessageType != HvMessageTypeNone) + { + DPRINT_DBG(VMBUS, "received msg type %d size %d", msg->Header.MessageType, msg->Header.PayloadSize); + ret |= 0x1; + } + + /* TODO: Check if there are events to be process */ + page_addr = gHvContext.synICEventPage[0]; + event = (HV_SYNIC_EVENT_FLAGS*)page_addr + VMBUS_MESSAGE_SINT; + + /* Since we are a child, we only need to check bit 0 */ + if (test_and_clear_bit(0, (unsigned long *) &event->Flags32[0])) + { + DPRINT_DBG(VMBUS, "received event %d", event->Flags32[0]); + ret |= 0x2; + } + + DPRINT_EXIT(VMBUS); + return ret; +} + +/* eof */ |