| /* |
| * 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 <linux/slab.h> |
| #include "osd.h" |
| #include "logging.h" |
| #include "version_info.h" |
| #include "vmbus_private.h" |
| |
| 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 struct hv_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 struct hv_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 */ |
| |
| /* |
| * VmbusGetChannelOffers - Retrieve the channel offers from the parent partition |
| */ |
| static void VmbusGetChannelOffers(void) |
| { |
| VmbusChannelRequestOffers(); |
| } |
| |
| /* |
| * VmbusGetChannelInterface - Get the channel interface |
| */ |
| static void VmbusGetChannelInterface(struct vmbus_channel_interface *Interface) |
| { |
| GetChannelInterface(Interface); |
| } |
| |
| /* |
| * VmbusGetChannelInfo - Get the device info for the specified device object |
| */ |
| static void VmbusGetChannelInfo(struct hv_device *DeviceObject, |
| struct hv_device_info *DeviceInfo) |
| { |
| GetChannelInfo(DeviceObject, DeviceInfo); |
| } |
| |
| /* |
| * VmbusCreateChildDevice - Creates the child device on the bus that represents the channel offer |
| */ |
| struct hv_device *VmbusChildDeviceCreate(struct hv_guid *DeviceType, |
| struct hv_guid *DeviceInstance, |
| void *Context) |
| { |
| struct vmbus_driver *vmbusDriver = (struct vmbus_driver *)gDriver; |
| |
| return vmbusDriver->OnChildDeviceCreate(DeviceType, DeviceInstance, |
| Context); |
| } |
| |
| /* |
| * VmbusChildDeviceAdd - Registers the child device with the vmbus |
| */ |
| int VmbusChildDeviceAdd(struct hv_device *ChildDevice) |
| { |
| struct vmbus_driver *vmbusDriver = (struct vmbus_driver *)gDriver; |
| |
| return vmbusDriver->OnChildDeviceAdd(gDevice, ChildDevice); |
| } |
| |
| /* |
| * VmbusChildDeviceRemove Unregisters the child device from the vmbus |
| */ |
| void VmbusChildDeviceRemove(struct hv_device *ChildDevice) |
| { |
| struct vmbus_driver *vmbusDriver = (struct vmbus_driver *)gDriver; |
| |
| vmbusDriver->OnChildDeviceRemove(ChildDevice); |
| } |
| |
| /* |
| * VmbusOnDeviceAdd - Callback when the root bus device is added |
| */ |
| static int VmbusOnDeviceAdd(struct hv_device *dev, void *AdditionalInfo) |
| { |
| u32 *irqvector = AdditionalInfo; |
| int ret; |
| |
| gDevice = dev; |
| |
| memcpy(&gDevice->deviceType, &gVmbusDeviceType, sizeof(struct hv_guid)); |
| memcpy(&gDevice->deviceInstance, &gVmbusDeviceId, |
| sizeof(struct hv_guid)); |
| |
| /* strcpy(dev->name, "vmbus"); */ |
| /* SynIC setup... */ |
| on_each_cpu(HvSynicInit, (void *)irqvector, 1); |
| |
| /* Connect to VMBus in the root partition */ |
| ret = VmbusConnect(); |
| |
| /* VmbusSendEvent(device->localPortId+1); */ |
| return ret; |
| } |
| |
| /* |
| * VmbusOnDeviceRemove - Callback when the root bus device is removed |
| */ |
| static int VmbusOnDeviceRemove(struct hv_device *dev) |
| { |
| int ret = 0; |
| |
| VmbusChannelReleaseUnattachedChannels(); |
| VmbusDisconnect(); |
| on_each_cpu(HvSynicCleanup, NULL, 1); |
| return ret; |
| } |
| |
| /* |
| * VmbusOnCleanup - Perform any cleanup when the driver is removed |
| */ |
| static void VmbusOnCleanup(struct hv_driver *drv) |
| { |
| /* struct vmbus_driver *driver = (struct vmbus_driver *)drv; */ |
| |
| HvCleanup(); |
| } |
| |
| /* |
| * VmbusOnMsgDPC - DPC routine to handle messages from the hypervisior |
| */ |
| static void VmbusOnMsgDPC(struct hv_driver *drv) |
| { |
| int cpu = smp_processor_id(); |
| void *page_addr = gHvContext.synICMessagePage[cpu]; |
| struct hv_message *msg = (struct hv_message *)page_addr + |
| VMBUS_MESSAGE_SINT; |
| struct hv_message *copied; |
| |
| while (1) { |
| if (msg->Header.MessageType == HvMessageTypeNone) { |
| /* no msg */ |
| break; |
| } else { |
| copied = kmemdup(msg, sizeof(*copied), GFP_ATOMIC); |
| if (copied == NULL) |
| continue; |
| |
| 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 |
| */ |
| wrmsrl(HV_X64_MSR_EOM, 0); |
| } |
| } |
| } |
| |
| /* |
| * VmbusOnEventDPC - DPC routine to handle events from the hypervisior |
| */ |
| static void VmbusOnEventDPC(struct hv_driver *drv) |
| { |
| /* TODO: Process any events */ |
| VmbusOnEvents(); |
| } |
| |
| /* |
| * VmbusOnISR - ISR routine |
| */ |
| static int VmbusOnISR(struct hv_driver *drv) |
| { |
| int ret = 0; |
| int cpu = smp_processor_id(); |
| void *page_addr; |
| struct hv_message *msg; |
| union hv_synic_event_flags *event; |
| |
| page_addr = gHvContext.synICMessagePage[cpu]; |
| msg = (struct hv_message *)page_addr + VMBUS_MESSAGE_SINT; |
| |
| /* 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[cpu]; |
| event = (union 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; |
| } |
| |
| return ret; |
| } |
| |
| /* |
| * VmbusInitialize - Main entry point |
| */ |
| int VmbusInitialize(struct hv_driver *drv) |
| { |
| struct vmbus_driver *driver = (struct vmbus_driver *)drv; |
| int ret; |
| |
| DPRINT_INFO(VMBUS, "+++++++ HV Driver version = %s +++++++", |
| HV_DRV_VERSION); |
| 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(struct hv_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; |
| |
| return ret; |
| } |