Commit | Line | Data |
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3e7ee490 | 1 | /* |
3e7ee490 HJ |
2 | * Copyright (c) 2009, Microsoft Corporation. |
3 | * | |
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. | |
7 | * | |
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 | |
11 | * more details. | |
12 | * | |
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. | |
16 | * | |
17 | * Authors: | |
18 | * Haiyang Zhang <haiyangz@microsoft.com> | |
19 | * Hank Janssen <hjanssen@microsoft.com> | |
20 | * | |
21 | */ | |
5654e932 | 22 | #include <linux/kernel.h> |
0ffa63b0 | 23 | #include <linux/mm.h> |
5a0e3ad6 | 24 | #include <linux/slab.h> |
4983b39a | 25 | #include "osd.h" |
645954c5 | 26 | #include "logging.h" |
2d82f6c7 | 27 | #include "version_info.h" |
72daf320 | 28 | #include "vmbus_private.h" |
3e7ee490 | 29 | |
772ec4e2 | 30 | static const char *gDriverName = "vmbus"; |
454f18a9 | 31 | |
772ec4e2 GKH |
32 | /* |
33 | * Windows vmbus does not defined this. | |
454f18a9 BP |
34 | * We defined this to be consistent with other devices |
35 | */ | |
36 | /* {c5295816-f63a-4d5f-8d1a-4daf999ca185} */ | |
caf26a31 GKH |
37 | static const struct hv_guid gVmbusDeviceType = { |
38 | .data = { | |
39 | 0x16, 0x58, 0x29, 0xc5, 0x3a, 0xf6, 0x5f, 0x4d, | |
40 | 0x8d, 0x1a, 0x4d, 0xaf, 0x99, 0x9c, 0xa1, 0x85 | |
41 | } | |
3e7ee490 HJ |
42 | }; |
43 | ||
454f18a9 | 44 | /* {ac3760fc-9adf-40aa-9427-a70ed6de95c5} */ |
caf26a31 GKH |
45 | static const struct hv_guid gVmbusDeviceId = { |
46 | .data = { | |
47 | 0xfc, 0x60, 0x37, 0xac, 0xdf, 0x9a, 0xaa, 0x40, | |
48 | 0x94, 0x27, 0xa7, 0x0e, 0xd6, 0xde, 0x95, 0xc5 | |
49 | } | |
3e7ee490 HJ |
50 | }; |
51 | ||
775ef25e | 52 | static struct hv_driver *gDriver; /* vmbus driver object */ |
772ec4e2 | 53 | static struct hv_device *gDevice; /* vmbus root device */ |
3e7ee490 | 54 | |
3e189519 | 55 | /* |
772ec4e2 GKH |
56 | * VmbusGetChannelOffers - Retrieve the channel offers from the parent partition |
57 | */ | |
58 | static void VmbusGetChannelOffers(void) | |
3e7ee490 | 59 | { |
3e7ee490 | 60 | VmbusChannelRequestOffers(); |
3e7ee490 HJ |
61 | } |
62 | ||
3e189519 | 63 | /* |
772ec4e2 GKH |
64 | * VmbusGetChannelInterface - Get the channel interface |
65 | */ | |
ee3d7ddf | 66 | static void VmbusGetChannelInterface(struct vmbus_channel_interface *Interface) |
3e7ee490 HJ |
67 | { |
68 | GetChannelInterface(Interface); | |
69 | } | |
70 | ||
3e189519 | 71 | /* |
772ec4e2 GKH |
72 | * VmbusGetChannelInfo - Get the device info for the specified device object |
73 | */ | |
74 | static void VmbusGetChannelInfo(struct hv_device *DeviceObject, | |
75 | struct hv_device_info *DeviceInfo) | |
3e7ee490 HJ |
76 | { |
77 | GetChannelInfo(DeviceObject, DeviceInfo); | |
78 | } | |
79 | ||
3e189519 | 80 | /* |
772ec4e2 GKH |
81 | * VmbusCreateChildDevice - Creates the child device on the bus that represents the channel offer |
82 | */ | |
daaa8cc3 GKH |
83 | struct hv_device *VmbusChildDeviceCreate(struct hv_guid *DeviceType, |
84 | struct hv_guid *DeviceInstance, | |
f346fdc2 | 85 | void *Context) |
3e7ee490 | 86 | { |
ee3d7ddf | 87 | struct vmbus_driver *vmbusDriver = (struct vmbus_driver *)gDriver; |
3e7ee490 | 88 | |
772ec4e2 GKH |
89 | return vmbusDriver->OnChildDeviceCreate(DeviceType, DeviceInstance, |
90 | Context); | |
3e7ee490 HJ |
91 | } |
92 | ||
3e189519 | 93 | /* |
772ec4e2 GKH |
94 | * VmbusChildDeviceAdd - Registers the child device with the vmbus |
95 | */ | |
f346fdc2 | 96 | int VmbusChildDeviceAdd(struct hv_device *ChildDevice) |
3e7ee490 | 97 | { |
ee3d7ddf | 98 | struct vmbus_driver *vmbusDriver = (struct vmbus_driver *)gDriver; |
3e7ee490 HJ |
99 | |
100 | return vmbusDriver->OnChildDeviceAdd(gDevice, ChildDevice); | |
101 | } | |
102 | ||
3e189519 | 103 | /* |
772ec4e2 GKH |
104 | * VmbusChildDeviceRemove Unregisters the child device from the vmbus |
105 | */ | |
f346fdc2 | 106 | void VmbusChildDeviceRemove(struct hv_device *ChildDevice) |
3e7ee490 | 107 | { |
ee3d7ddf | 108 | struct vmbus_driver *vmbusDriver = (struct vmbus_driver *)gDriver; |
3e7ee490 HJ |
109 | |
110 | vmbusDriver->OnChildDeviceRemove(ChildDevice); | |
111 | } | |
112 | ||
3e189519 | 113 | /* |
772ec4e2 GKH |
114 | * VmbusOnDeviceAdd - Callback when the root bus device is added |
115 | */ | |
116 | static int VmbusOnDeviceAdd(struct hv_device *dev, void *AdditionalInfo) | |
3e7ee490 | 117 | { |
772ec4e2 GKH |
118 | u32 *irqvector = AdditionalInfo; |
119 | int ret; | |
3e7ee490 | 120 | |
3e7ee490 HJ |
121 | gDevice = dev; |
122 | ||
caf26a31 | 123 | memcpy(&gDevice->deviceType, &gVmbusDeviceType, sizeof(struct hv_guid)); |
772ec4e2 GKH |
124 | memcpy(&gDevice->deviceInstance, &gVmbusDeviceId, |
125 | sizeof(struct hv_guid)); | |
3e7ee490 | 126 | |
454f18a9 BP |
127 | /* strcpy(dev->name, "vmbus"); */ |
128 | /* SynIC setup... */ | |
7692fd4d | 129 | on_each_cpu(HvSynicInit, (void *)irqvector, 1); |
3e7ee490 | 130 | |
454f18a9 | 131 | /* Connect to VMBus in the root partition */ |
3e7ee490 HJ |
132 | ret = VmbusConnect(); |
133 | ||
454f18a9 | 134 | /* VmbusSendEvent(device->localPortId+1); */ |
3e7ee490 HJ |
135 | return ret; |
136 | } | |
137 | ||
3e189519 | 138 | /* |
772ec4e2 GKH |
139 | * VmbusOnDeviceRemove - Callback when the root bus device is removed |
140 | */ | |
141 | static int VmbusOnDeviceRemove(struct hv_device *dev) | |
3e7ee490 | 142 | { |
772ec4e2 | 143 | int ret = 0; |
3e7ee490 | 144 | |
3e7ee490 | 145 | VmbusChannelReleaseUnattachedChannels(); |
3e7ee490 | 146 | VmbusDisconnect(); |
7692fd4d | 147 | on_each_cpu(HvSynicCleanup, NULL, 1); |
3e7ee490 HJ |
148 | return ret; |
149 | } | |
150 | ||
3e189519 | 151 | /* |
772ec4e2 GKH |
152 | * VmbusOnCleanup - Perform any cleanup when the driver is removed |
153 | */ | |
154 | static void VmbusOnCleanup(struct hv_driver *drv) | |
3e7ee490 | 155 | { |
ee3d7ddf | 156 | /* struct vmbus_driver *driver = (struct vmbus_driver *)drv; */ |
3e7ee490 | 157 | |
3e7ee490 | 158 | HvCleanup(); |
3e7ee490 HJ |
159 | } |
160 | ||
3e189519 | 161 | /* |
772ec4e2 GKH |
162 | * VmbusOnMsgDPC - DPC routine to handle messages from the hypervisior |
163 | */ | |
164 | static void VmbusOnMsgDPC(struct hv_driver *drv) | |
3e7ee490 | 165 | { |
7692fd4d GKH |
166 | int cpu = smp_processor_id(); |
167 | void *page_addr = gHvContext.synICMessagePage[cpu]; | |
772ec4e2 GKH |
168 | struct hv_message *msg = (struct hv_message *)page_addr + |
169 | VMBUS_MESSAGE_SINT; | |
eacb1b4d | 170 | struct hv_message *copied; |
772ec4e2 GKH |
171 | |
172 | while (1) { | |
173 | if (msg->Header.MessageType == HvMessageTypeNone) { | |
174 | /* no msg */ | |
3e7ee490 | 175 | break; |
772ec4e2 | 176 | } else { |
94002c07 | 177 | copied = kmemdup(msg, sizeof(*copied), GFP_ATOMIC); |
3e7ee490 | 178 | if (copied == NULL) |
3e7ee490 | 179 | continue; |
3e7ee490 | 180 | |
de65a384 BP |
181 | osd_schedule_callback(gVmbusConnection.WorkQueue, |
182 | VmbusOnChannelMessage, | |
183 | (void *)copied); | |
3e7ee490 HJ |
184 | } |
185 | ||
186 | msg->Header.MessageType = HvMessageTypeNone; | |
187 | ||
454f18a9 BP |
188 | /* |
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 | |
193 | * no empty slot | |
194 | */ | |
28b6ca9c | 195 | mb(); |
3e7ee490 | 196 | |
772ec4e2 | 197 | if (msg->Header.MessageFlags.MessagePending) { |
454f18a9 BP |
198 | /* |
199 | * This will cause message queue rescan to | |
200 | * possibly deliver another msg from the | |
201 | * hypervisor | |
202 | */ | |
a51ed7d6 | 203 | wrmsrl(HV_X64_MSR_EOM, 0); |
3e7ee490 HJ |
204 | } |
205 | } | |
206 | } | |
207 | ||
3e189519 | 208 | /* |
772ec4e2 GKH |
209 | * VmbusOnEventDPC - DPC routine to handle events from the hypervisior |
210 | */ | |
211 | static void VmbusOnEventDPC(struct hv_driver *drv) | |
3e7ee490 | 212 | { |
454f18a9 | 213 | /* TODO: Process any events */ |
3e7ee490 HJ |
214 | VmbusOnEvents(); |
215 | } | |
216 | ||
3e189519 | 217 | /* |
772ec4e2 GKH |
218 | * VmbusOnISR - ISR routine |
219 | */ | |
220 | static int VmbusOnISR(struct hv_driver *drv) | |
3e7ee490 | 221 | { |
772ec4e2 | 222 | int ret = 0; |
7692fd4d | 223 | int cpu = smp_processor_id(); |
3e7ee490 | 224 | void *page_addr; |
eacb1b4d GKH |
225 | struct hv_message *msg; |
226 | union hv_synic_event_flags *event; | |
3e7ee490 | 227 | |
7692fd4d | 228 | page_addr = gHvContext.synICMessagePage[cpu]; |
eacb1b4d | 229 | msg = (struct hv_message *)page_addr + VMBUS_MESSAGE_SINT; |
3e7ee490 | 230 | |
454f18a9 | 231 | /* Check if there are actual msgs to be process */ |
772ec4e2 GKH |
232 | if (msg->Header.MessageType != HvMessageTypeNone) { |
233 | DPRINT_DBG(VMBUS, "received msg type %d size %d", | |
234 | msg->Header.MessageType, | |
235 | msg->Header.PayloadSize); | |
3e7ee490 | 236 | ret |= 0x1; |
772ec4e2 | 237 | } |
3e7ee490 | 238 | |
454f18a9 | 239 | /* TODO: Check if there are events to be process */ |
7692fd4d | 240 | page_addr = gHvContext.synICEventPage[cpu]; |
eacb1b4d | 241 | event = (union hv_synic_event_flags *)page_addr + VMBUS_MESSAGE_SINT; |
3e7ee490 | 242 | |
454f18a9 | 243 | /* Since we are a child, we only need to check bit 0 */ |
772ec4e2 | 244 | if (test_and_clear_bit(0, (unsigned long *) &event->Flags32[0])) { |
3e7ee490 HJ |
245 | DPRINT_DBG(VMBUS, "received event %d", event->Flags32[0]); |
246 | ret |= 0x2; | |
247 | } | |
248 | ||
3e7ee490 HJ |
249 | return ret; |
250 | } | |
b3bfb3ce | 251 | |
3e189519 | 252 | /* |
b3bfb3ce GKH |
253 | * VmbusInitialize - Main entry point |
254 | */ | |
255 | int VmbusInitialize(struct hv_driver *drv) | |
256 | { | |
257 | struct vmbus_driver *driver = (struct vmbus_driver *)drv; | |
258 | int ret; | |
259 | ||
26c14cc1 HJ |
260 | DPRINT_INFO(VMBUS, "+++++++ HV Driver version = %s +++++++", |
261 | HV_DRV_VERSION); | |
b3bfb3ce GKH |
262 | DPRINT_INFO(VMBUS, "+++++++ Vmbus supported version = %d +++++++", |
263 | VMBUS_REVISION_NUMBER); | |
264 | DPRINT_INFO(VMBUS, "+++++++ Vmbus using SINT %d +++++++", | |
265 | VMBUS_MESSAGE_SINT); | |
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)); | |
270 | ||
271 | drv->name = gDriverName; | |
272 | memcpy(&drv->deviceType, &gVmbusDeviceType, sizeof(struct hv_guid)); | |
273 | ||
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; | |
284 | ||
285 | /* Hypervisor initialization...setup hypercall page..etc */ | |
286 | ret = HvInit(); | |
287 | if (ret != 0) | |
288 | DPRINT_ERR(VMBUS, "Unable to initialize the hypervisor - 0x%x", | |
289 | ret); | |
290 | gDriver = drv; | |
291 | ||
b3bfb3ce GKH |
292 | return ret; |
293 | } |