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 vmbus_request_offers();
64 * VmbusCreateChildDevice - Creates the child device on the bus that represents the channel offer
66 struct hv_device
*VmbusChildDeviceCreate(struct hv_guid
*DeviceType
,
67 struct hv_guid
*DeviceInstance
,
68 struct vmbus_channel
*channel
)
70 struct vmbus_driver
*vmbusDriver
= (struct vmbus_driver
*)gDriver
;
72 return vmbusDriver
->OnChildDeviceCreate(DeviceType
, DeviceInstance
,
77 * VmbusChildDeviceAdd - Registers the child device with the vmbus
79 int VmbusChildDeviceAdd(struct hv_device
*ChildDevice
)
81 struct vmbus_driver
*vmbusDriver
= (struct vmbus_driver
*)gDriver
;
83 return vmbusDriver
->OnChildDeviceAdd(gDevice
, ChildDevice
);
87 * VmbusChildDeviceRemove Unregisters the child device from the vmbus
89 void VmbusChildDeviceRemove(struct hv_device
*ChildDevice
)
91 struct vmbus_driver
*vmbusDriver
= (struct vmbus_driver
*)gDriver
;
93 vmbusDriver
->OnChildDeviceRemove(ChildDevice
);
97 * VmbusOnDeviceAdd - Callback when the root bus device is added
99 static int VmbusOnDeviceAdd(struct hv_device
*dev
, void *AdditionalInfo
)
101 u32
*irqvector
= AdditionalInfo
;
106 memcpy(&gDevice
->deviceType
, &gVmbusDeviceType
, sizeof(struct hv_guid
));
107 memcpy(&gDevice
->deviceInstance
, &gVmbusDeviceId
,
108 sizeof(struct hv_guid
));
110 /* strcpy(dev->name, "vmbus"); */
112 on_each_cpu(HvSynicInit
, (void *)irqvector
, 1);
114 /* Connect to VMBus in the root partition */
115 ret
= VmbusConnect();
117 /* VmbusSendEvent(device->localPortId+1); */
122 * VmbusOnDeviceRemove - Callback when the root bus device is removed
124 static int VmbusOnDeviceRemove(struct hv_device
*dev
)
128 vmbus_release_unattached_channels();
130 on_each_cpu(HvSynicCleanup
, NULL
, 1);
135 * VmbusOnCleanup - Perform any cleanup when the driver is removed
137 static void VmbusOnCleanup(struct hv_driver
*drv
)
139 /* struct vmbus_driver *driver = (struct vmbus_driver *)drv; */
145 * VmbusOnMsgDPC - DPC routine to handle messages from the hypervisior
147 static void VmbusOnMsgDPC(struct hv_driver
*drv
)
149 int cpu
= smp_processor_id();
150 void *page_addr
= gHvContext
.synICMessagePage
[cpu
];
151 struct hv_message
*msg
= (struct hv_message
*)page_addr
+
153 struct hv_message
*copied
;
156 if (msg
->Header
.MessageType
== HvMessageTypeNone
) {
160 copied
= kmemdup(msg
, sizeof(*copied
), GFP_ATOMIC
);
164 osd_schedule_callback(gVmbusConnection
.WorkQueue
,
169 msg
->Header
.MessageType
= HvMessageTypeNone
;
172 * Make sure the write to MessageType (ie set to
173 * HvMessageTypeNone) happens before we read the
174 * MessagePending and EOMing. Otherwise, the EOMing
175 * will not deliver any more messages since there is
180 if (msg
->Header
.MessageFlags
.MessagePending
) {
182 * This will cause message queue rescan to
183 * possibly deliver another msg from the
186 wrmsrl(HV_X64_MSR_EOM
, 0);
192 * VmbusOnEventDPC - DPC routine to handle events from the hypervisior
194 static void VmbusOnEventDPC(struct hv_driver
*drv
)
196 /* TODO: Process any events */
201 * VmbusOnISR - ISR routine
203 static int VmbusOnISR(struct hv_driver
*drv
)
206 int cpu
= smp_processor_id();
208 struct hv_message
*msg
;
209 union hv_synic_event_flags
*event
;
211 page_addr
= gHvContext
.synICMessagePage
[cpu
];
212 msg
= (struct hv_message
*)page_addr
+ VMBUS_MESSAGE_SINT
;
214 /* Check if there are actual msgs to be process */
215 if (msg
->Header
.MessageType
!= HvMessageTypeNone
) {
216 DPRINT_DBG(VMBUS
, "received msg type %d size %d",
217 msg
->Header
.MessageType
,
218 msg
->Header
.PayloadSize
);
222 /* TODO: Check if there are events to be process */
223 page_addr
= gHvContext
.synICEventPage
[cpu
];
224 event
= (union hv_synic_event_flags
*)page_addr
+ VMBUS_MESSAGE_SINT
;
226 /* Since we are a child, we only need to check bit 0 */
227 if (test_and_clear_bit(0, (unsigned long *) &event
->Flags32
[0])) {
228 DPRINT_DBG(VMBUS
, "received event %d", event
->Flags32
[0]);
236 * VmbusInitialize - Main entry point
238 int VmbusInitialize(struct hv_driver
*drv
)
240 struct vmbus_driver
*driver
= (struct vmbus_driver
*)drv
;
243 DPRINT_INFO(VMBUS
, "+++++++ HV Driver version = %s +++++++",
245 DPRINT_INFO(VMBUS
, "+++++++ Vmbus supported version = %d +++++++",
246 VMBUS_REVISION_NUMBER
);
247 DPRINT_INFO(VMBUS
, "+++++++ Vmbus using SINT %d +++++++",
249 DPRINT_DBG(VMBUS
, "sizeof(vmbus_channel_packet_page_buffer)=%zd, "
250 "sizeof(VMBUS_CHANNEL_PACKET_MULITPAGE_BUFFER)=%zd",
251 sizeof(struct vmbus_channel_packet_page_buffer
),
252 sizeof(struct vmbus_channel_packet_multipage_buffer
));
254 drv
->name
= gDriverName
;
255 memcpy(&drv
->deviceType
, &gVmbusDeviceType
, sizeof(struct hv_guid
));
257 /* Setup dispatch table */
258 driver
->Base
.OnDeviceAdd
= VmbusOnDeviceAdd
;
259 driver
->Base
.OnDeviceRemove
= VmbusOnDeviceRemove
;
260 driver
->Base
.OnCleanup
= VmbusOnCleanup
;
261 driver
->OnIsr
= VmbusOnISR
;
262 driver
->OnMsgDpc
= VmbusOnMsgDPC
;
263 driver
->OnEventDpc
= VmbusOnEventDPC
;
264 driver
->GetChannelOffers
= VmbusGetChannelOffers
;
266 /* Hypervisor initialization...setup hypercall page..etc */
269 DPRINT_ERR(VMBUS
, "Unable to initialize the hypervisor - 0x%x",