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author | Russell King <rmk+kernel@arm.linux.org.uk> | 2009-09-22 19:54:53 (GMT) |
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committer | Russell King <rmk+kernel@arm.linux.org.uk> | 2009-09-22 20:01:40 (GMT) |
commit | ae19ffbadc1b2100285a5b5b3d0a4e0a11390904 (patch) | |
tree | 3c2086ab67398a019089a47ca3f362a4bc6db74f /drivers/staging/hv/Vmbus.c | |
parent | 34e84f39a27d059a3e6ec6e8b94aafa702e6f220 (diff) | |
parent | 9173a8ef24a6b1b8031507b35b8ffe5f85a87692 (diff) | |
download | linux-fsl-qoriq-ae19ffbadc1b2100285a5b5b3d0a4e0a11390904.tar.xz |
Merge branch 'master' into for-linus
Diffstat (limited to 'drivers/staging/hv/Vmbus.c')
-rw-r--r-- | drivers/staging/hv/Vmbus.c | 311 |
1 files changed, 311 insertions, 0 deletions
diff --git a/drivers/staging/hv/Vmbus.c b/drivers/staging/hv/Vmbus.c new file mode 100644 index 0000000..a4dd06f --- /dev/null +++ b/drivers/staging/hv/Vmbus.c @@ -0,0 +1,311 @@ +/* + * 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 "osd.h" +#include "logging.h" +#include "VersionInfo.h" +#include "VmbusPrivate.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) +{ + DPRINT_ENTER(VMBUS); + VmbusChannelRequestOffers(); + DPRINT_EXIT(VMBUS); +} + +/** + * 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; + + DPRINT_ENTER(VMBUS); + + gDevice = dev; + + memcpy(&gDevice->deviceType, &gVmbusDeviceType, sizeof(struct hv_guid)); + memcpy(&gDevice->deviceInstance, &gVmbusDeviceId, + sizeof(struct hv_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; +} + +/** + * VmbusOnDeviceRemove - 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; +} + +/** + * VmbusOnCleanup - Perform any cleanup when the driver is removed + */ +static void VmbusOnCleanup(struct hv_driver *drv) +{ + /* struct vmbus_driver *driver = (struct vmbus_driver *)drv; */ + + DPRINT_ENTER(VMBUS); + HvCleanup(); + DPRINT_EXIT(VMBUS); +} + +/** + * VmbusOnMsgDPC - DPC routine to handle messages from the hypervisior + */ +static void VmbusOnMsgDPC(struct hv_driver *drv) +{ + void *page_addr = gHvContext.synICMessagePage[0]; + 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 = kmalloc(sizeof(*copied), GFP_ATOMIC); + if (copied == NULL) + continue; + + memcpy(copied, msg, sizeof(*copied)); + 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; + void *page_addr; + struct hv_message *msg; + union hv_synic_event_flags *event; + + page_addr = gHvContext.synICMessagePage[0]; + msg = (struct 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 = (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; + } + + DPRINT_EXIT(VMBUS); + return ret; +} + +/** + * VmbusInitialize - Main entry point + */ +int VmbusInitialize(struct hv_driver *drv) +{ + struct vmbus_driver *driver = (struct vmbus_driver *)drv; + int ret; + + 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(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; + + DPRINT_EXIT(VMBUS); + + return ret; +} |