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
= "hyperv";
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 * VmbusChildDeviceAdd - Registers the child device with the vmbus
58 int VmbusChildDeviceAdd(struct hv_device
*ChildDevice
)
60 return vmbus_child_device_register(gDevice
, ChildDevice
);
64 * VmbusOnDeviceAdd - Callback when the root bus device is added
66 static int VmbusOnDeviceAdd(struct hv_device
*dev
, void *AdditionalInfo
)
68 u32
*irqvector
= AdditionalInfo
;
73 memcpy(&gDevice
->deviceType
, &gVmbusDeviceType
, sizeof(struct hv_guid
));
74 memcpy(&gDevice
->deviceInstance
, &gVmbusDeviceId
,
75 sizeof(struct hv_guid
));
77 /* strcpy(dev->name, "vmbus"); */
79 on_each_cpu(hv_synic_init
, (void *)irqvector
, 1);
81 /* Connect to VMBus in the root partition */
84 /* VmbusSendEvent(device->localPortId+1); */
89 * VmbusOnDeviceRemove - Callback when the root bus device is removed
91 static int VmbusOnDeviceRemove(struct hv_device
*dev
)
95 vmbus_release_unattached_channels();
97 on_each_cpu(hv_synic_cleanup
, NULL
, 1);
102 * VmbusOnCleanup - Perform any cleanup when the driver is removed
104 static void VmbusOnCleanup(struct hv_driver
*drv
)
106 /* struct vmbus_driver *driver = (struct vmbus_driver *)drv; */
112 * vmbus_on_msg_dpc - DPC routine to handle messages from the hypervisior
114 void vmbus_on_msg_dpc(struct hv_driver
*drv
)
116 int cpu
= smp_processor_id();
117 void *page_addr
= hv_context
.synic_message_page
[cpu
];
118 struct hv_message
*msg
= (struct hv_message
*)page_addr
+
120 struct hv_message
*copied
;
123 if (msg
->header
.message_type
== HVMSG_NONE
) {
127 copied
= kmemdup(msg
, sizeof(*copied
), GFP_ATOMIC
);
131 osd_schedule_callback(gVmbusConnection
.WorkQueue
,
136 msg
->header
.message_type
= HVMSG_NONE
;
139 * Make sure the write to MessageType (ie set to
140 * HVMSG_NONE) happens before we read the
141 * MessagePending and EOMing. Otherwise, the EOMing
142 * will not deliver any more messages since there is
147 if (msg
->header
.message_flags
.msg_pending
) {
149 * This will cause message queue rescan to
150 * possibly deliver another msg from the
153 wrmsrl(HV_X64_MSR_EOM
, 0);
159 * vmbus_on_event_dpc - DPC routine to handle events from the hypervisior
161 void vmbus_on_event_dpc(struct hv_driver
*drv
)
163 /* TODO: Process any events */
168 * vmbus_on_isr - ISR routine
170 int vmbus_on_isr(struct hv_driver
*drv
)
173 int cpu
= smp_processor_id();
175 struct hv_message
*msg
;
176 union hv_synic_event_flags
*event
;
178 page_addr
= hv_context
.synic_message_page
[cpu
];
179 msg
= (struct hv_message
*)page_addr
+ VMBUS_MESSAGE_SINT
;
181 /* Check if there are actual msgs to be process */
182 if (msg
->header
.message_type
!= HVMSG_NONE
) {
183 DPRINT_DBG(VMBUS
, "received msg type %d size %d",
184 msg
->header
.message_type
,
185 msg
->header
.payload_size
);
189 /* TODO: Check if there are events to be process */
190 page_addr
= hv_context
.synic_event_page
[cpu
];
191 event
= (union hv_synic_event_flags
*)page_addr
+ VMBUS_MESSAGE_SINT
;
193 /* Since we are a child, we only need to check bit 0 */
194 if (test_and_clear_bit(0, (unsigned long *) &event
->flags32
[0])) {
195 DPRINT_DBG(VMBUS
, "received event %d", event
->flags32
[0]);
203 * VmbusInitialize - Main entry point
205 int VmbusInitialize(struct hv_driver
*driver
)
209 DPRINT_INFO(VMBUS
, "+++++++ HV Driver version = %s +++++++",
211 DPRINT_INFO(VMBUS
, "+++++++ Vmbus supported version = %d +++++++",
212 VMBUS_REVISION_NUMBER
);
213 DPRINT_INFO(VMBUS
, "+++++++ Vmbus using SINT %d +++++++",
215 DPRINT_DBG(VMBUS
, "sizeof(vmbus_channel_packet_page_buffer)=%zd, "
216 "sizeof(VMBUS_CHANNEL_PACKET_MULITPAGE_BUFFER)=%zd",
217 sizeof(struct vmbus_channel_packet_page_buffer
),
218 sizeof(struct vmbus_channel_packet_multipage_buffer
));
220 driver
->name
= gDriverName
;
221 memcpy(&driver
->deviceType
, &gVmbusDeviceType
, sizeof(struct hv_guid
));
223 /* Setup dispatch table */
224 driver
->OnDeviceAdd
= VmbusOnDeviceAdd
;
225 driver
->OnDeviceRemove
= VmbusOnDeviceRemove
;
226 driver
->OnCleanup
= VmbusOnCleanup
;
228 /* Hypervisor initialization...setup hypercall page..etc */
231 DPRINT_ERR(VMBUS
, "Unable to initialize the hypervisor - 0x%x",