2 * Copyright (c) 2009, Microsoft Corporation.
4 * This program is free software; you can redistribute it and/or modify it
5 * under the terms and conditions of the GNU General Public License,
6 * version 2, as published by the Free Software Foundation.
8 * This program is distributed in the hope it will be useful, but WITHOUT
9 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
10 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
13 * You should have received a copy of the GNU General Public License along with
14 * this program; if not, write to the Free Software Foundation, Inc., 59 Temple
15 * Place - Suite 330, Boston, MA 02111-1307 USA.
18 * Haiyang Zhang <haiyangz@microsoft.com>
19 * Hank Janssen <hjanssen@microsoft.com>
22 #include <linux/kernel.h>
24 #include <linux/slab.h>
27 #include "version_info.h"
28 #include "vmbus_private.h"
30 static const char *gDriverName
= "vmbus";
33 * Windows vmbus does not defined this.
34 * We defined this to be consistent with other devices
36 /* {c5295816-f63a-4d5f-8d1a-4daf999ca185} */
37 static const struct hv_guid gVmbusDeviceType
= {
39 0x16, 0x58, 0x29, 0xc5, 0x3a, 0xf6, 0x5f, 0x4d,
40 0x8d, 0x1a, 0x4d, 0xaf, 0x99, 0x9c, 0xa1, 0x85
44 /* {ac3760fc-9adf-40aa-9427-a70ed6de95c5} */
45 static const struct hv_guid gVmbusDeviceId
= {
47 0xfc, 0x60, 0x37, 0xac, 0xdf, 0x9a, 0xaa, 0x40,
48 0x94, 0x27, 0xa7, 0x0e, 0xd6, 0xde, 0x95, 0xc5
52 static struct hv_driver
*gDriver
; /* vmbus driver object */
53 static struct hv_device
*gDevice
; /* vmbus root device */
56 * VmbusGetChannelOffers - Retrieve the channel offers from the parent partition
58 static void VmbusGetChannelOffers(void)
60 VmbusChannelRequestOffers();
64 * VmbusGetChannelInterface - Get the channel interface
66 static void VmbusGetChannelInterface(struct vmbus_channel_interface
*Interface
)
68 GetChannelInterface(Interface
);
72 * VmbusGetChannelInfo - Get the device info for the specified device object
74 static void VmbusGetChannelInfo(struct hv_device
*DeviceObject
,
75 struct hv_device_info
*DeviceInfo
)
77 GetChannelInfo(DeviceObject
, DeviceInfo
);
81 * VmbusCreateChildDevice - Creates the child device on the bus that represents the channel offer
83 struct hv_device
*VmbusChildDeviceCreate(struct hv_guid
*DeviceType
,
84 struct hv_guid
*DeviceInstance
,
87 struct vmbus_driver
*vmbusDriver
= (struct vmbus_driver
*)gDriver
;
89 return vmbusDriver
->OnChildDeviceCreate(DeviceType
, DeviceInstance
,
94 * VmbusChildDeviceAdd - Registers the child device with the vmbus
96 int VmbusChildDeviceAdd(struct hv_device
*ChildDevice
)
98 struct vmbus_driver
*vmbusDriver
= (struct vmbus_driver
*)gDriver
;
100 return vmbusDriver
->OnChildDeviceAdd(gDevice
, ChildDevice
);
104 * VmbusChildDeviceRemove Unregisters the child device from the vmbus
106 void VmbusChildDeviceRemove(struct hv_device
*ChildDevice
)
108 struct vmbus_driver
*vmbusDriver
= (struct vmbus_driver
*)gDriver
;
110 vmbusDriver
->OnChildDeviceRemove(ChildDevice
);
114 * VmbusOnDeviceAdd - Callback when the root bus device is added
116 static int VmbusOnDeviceAdd(struct hv_device
*dev
, void *AdditionalInfo
)
118 u32
*irqvector
= AdditionalInfo
;
123 memcpy(&gDevice
->deviceType
, &gVmbusDeviceType
, sizeof(struct hv_guid
));
124 memcpy(&gDevice
->deviceInstance
, &gVmbusDeviceId
,
125 sizeof(struct hv_guid
));
127 /* strcpy(dev->name, "vmbus"); */
129 on_each_cpu(HvSynicInit
, (void *)irqvector
, 1);
131 /* Connect to VMBus in the root partition */
132 ret
= VmbusConnect();
134 /* VmbusSendEvent(device->localPortId+1); */
139 * VmbusOnDeviceRemove - Callback when the root bus device is removed
141 static int VmbusOnDeviceRemove(struct hv_device
*dev
)
145 VmbusChannelReleaseUnattachedChannels();
147 on_each_cpu(HvSynicCleanup
, NULL
, 1);
152 * VmbusOnCleanup - Perform any cleanup when the driver is removed
154 static void VmbusOnCleanup(struct hv_driver
*drv
)
156 /* struct vmbus_driver *driver = (struct vmbus_driver *)drv; */
162 * VmbusOnMsgDPC - DPC routine to handle messages from the hypervisior
164 static void VmbusOnMsgDPC(struct hv_driver
*drv
)
166 int cpu
= smp_processor_id();
167 void *page_addr
= gHvContext
.synICMessagePage
[cpu
];
168 struct hv_message
*msg
= (struct hv_message
*)page_addr
+
170 struct hv_message
*copied
;
173 if (msg
->Header
.MessageType
== HvMessageTypeNone
) {
177 copied
= kmemdup(msg
, sizeof(*copied
), GFP_ATOMIC
);
181 osd_schedule_callback(gVmbusConnection
.WorkQueue
,
182 VmbusOnChannelMessage
,
186 msg
->Header
.MessageType
= HvMessageTypeNone
;
189 * Make sure the write to MessageType (ie set to
190 * HvMessageTypeNone) happens before we read the
191 * MessagePending and EOMing. Otherwise, the EOMing
192 * will not deliver any more messages since there is
197 if (msg
->Header
.MessageFlags
.MessagePending
) {
199 * This will cause message queue rescan to
200 * possibly deliver another msg from the
203 wrmsrl(HV_X64_MSR_EOM
, 0);
209 * VmbusOnEventDPC - DPC routine to handle events from the hypervisior
211 static void VmbusOnEventDPC(struct hv_driver
*drv
)
213 /* TODO: Process any events */
218 * VmbusOnISR - ISR routine
220 static int VmbusOnISR(struct hv_driver
*drv
)
223 int cpu
= smp_processor_id();
225 struct hv_message
*msg
;
226 union hv_synic_event_flags
*event
;
228 page_addr
= gHvContext
.synICMessagePage
[cpu
];
229 msg
= (struct hv_message
*)page_addr
+ VMBUS_MESSAGE_SINT
;
231 /* Check if there are actual msgs to be process */
232 if (msg
->Header
.MessageType
!= HvMessageTypeNone
) {
233 DPRINT_DBG(VMBUS
, "received msg type %d size %d",
234 msg
->Header
.MessageType
,
235 msg
->Header
.PayloadSize
);
239 /* TODO: Check if there are events to be process */
240 page_addr
= gHvContext
.synICEventPage
[cpu
];
241 event
= (union hv_synic_event_flags
*)page_addr
+ VMBUS_MESSAGE_SINT
;
243 /* Since we are a child, we only need to check bit 0 */
244 if (test_and_clear_bit(0, (unsigned long *) &event
->Flags32
[0])) {
245 DPRINT_DBG(VMBUS
, "received event %d", event
->Flags32
[0]);
253 * VmbusInitialize - Main entry point
255 int VmbusInitialize(struct hv_driver
*drv
)
257 struct vmbus_driver
*driver
= (struct vmbus_driver
*)drv
;
260 DPRINT_INFO(VMBUS
, "+++++++ HV Driver version = %s +++++++",
262 DPRINT_INFO(VMBUS
, "+++++++ Vmbus supported version = %d +++++++",
263 VMBUS_REVISION_NUMBER
);
264 DPRINT_INFO(VMBUS
, "+++++++ Vmbus using SINT %d +++++++",
266 DPRINT_DBG(VMBUS
, "sizeof(VMBUS_CHANNEL_PACKET_PAGE_BUFFER)=%zd, "
267 "sizeof(VMBUS_CHANNEL_PACKET_MULITPAGE_BUFFER)=%zd",
268 sizeof(struct VMBUS_CHANNEL_PACKET_PAGE_BUFFER
),
269 sizeof(struct VMBUS_CHANNEL_PACKET_MULITPAGE_BUFFER
));
271 drv
->name
= gDriverName
;
272 memcpy(&drv
->deviceType
, &gVmbusDeviceType
, sizeof(struct hv_guid
));
274 /* Setup dispatch table */
275 driver
->Base
.OnDeviceAdd
= VmbusOnDeviceAdd
;
276 driver
->Base
.OnDeviceRemove
= VmbusOnDeviceRemove
;
277 driver
->Base
.OnCleanup
= VmbusOnCleanup
;
278 driver
->OnIsr
= VmbusOnISR
;
279 driver
->OnMsgDpc
= VmbusOnMsgDPC
;
280 driver
->OnEventDpc
= VmbusOnEventDPC
;
281 driver
->GetChannelOffers
= VmbusGetChannelOffers
;
282 driver
->GetChannelInterface
= VmbusGetChannelInterface
;
283 driver
->GetChannelInfo
= VmbusGetChannelInfo
;
285 /* Hypervisor initialization...setup hypercall page..etc */
288 DPRINT_ERR(VMBUS
, "Unable to initialize the hypervisor - 0x%x",