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> | |
b0069f43 | 20 | * K. Y. Srinivasan <kys@microsoft.com> |
52e5c1ce | 21 | * |
3e7ee490 | 22 | */ |
0a46618d HJ |
23 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
24 | ||
3e7ee490 HJ |
25 | #include <linux/init.h> |
26 | #include <linux/module.h> | |
27 | #include <linux/device.h> | |
28 | #include <linux/irq.h> | |
29 | #include <linux/interrupt.h> | |
30 | #include <linux/sysctl.h> | |
c22090fa | 31 | #include <linux/dmi.h> |
5a0e3ad6 | 32 | #include <linux/slab.h> |
b0069f43 S |
33 | #include <linux/acpi.h> |
34 | #include <acpi/acpi_bus.h> | |
8b5d6d3b | 35 | #include <linux/completion.h> |
3f335ea2 S |
36 | |
37 | #include "hyperv.h" | |
0f2a6619 | 38 | #include "hyperv_vmbus.h" |
3e7ee490 | 39 | |
3e7ee490 | 40 | |
607c1a11 | 41 | static struct acpi_device *hv_acpi_dev; |
1168ac22 | 42 | |
59c0e4f0 | 43 | static struct tasklet_struct msg_dpc; |
66d9229c | 44 | static struct tasklet_struct event_dpc; |
59c0e4f0 | 45 | |
98db4335 S |
46 | unsigned int vmbus_loglevel = (ALL_MODULES << 16 | INFO_LVL); |
47 | EXPORT_SYMBOL(vmbus_loglevel); | |
48 | /* (ALL_MODULES << 16 | DEBUG_LVL_ENTEREXIT); */ | |
49 | /* (((VMBUS | VMBUS_DRV)<<16) | DEBUG_LVL_ENTEREXIT); */ | |
50 | ||
71a6655d | 51 | static struct completion probe_event; |
b0069f43 | 52 | static int irq; |
98db4335 S |
53 | |
54 | static void get_channel_info(struct hv_device *device, | |
55 | struct hv_device_info *info) | |
56 | { | |
57 | struct vmbus_channel_debug_info debug_info; | |
58 | ||
59 | if (!device->channel) | |
60 | return; | |
61 | ||
62 | vmbus_get_debug_info(device->channel, &debug_info); | |
63 | ||
64 | info->chn_id = debug_info.relid; | |
65 | info->chn_state = debug_info.state; | |
66 | memcpy(&info->chn_type, &debug_info.interfacetype, | |
67 | sizeof(struct hv_guid)); | |
68 | memcpy(&info->chn_instance, &debug_info.interface_instance, | |
69 | sizeof(struct hv_guid)); | |
70 | ||
71 | info->monitor_id = debug_info.monitorid; | |
72 | ||
73 | info->server_monitor_pending = debug_info.servermonitor_pending; | |
74 | info->server_monitor_latency = debug_info.servermonitor_latency; | |
75 | info->server_monitor_conn_id = debug_info.servermonitor_connectionid; | |
76 | ||
77 | info->client_monitor_pending = debug_info.clientmonitor_pending; | |
78 | info->client_monitor_latency = debug_info.clientmonitor_latency; | |
79 | info->client_monitor_conn_id = debug_info.clientmonitor_connectionid; | |
80 | ||
81 | info->inbound.int_mask = debug_info.inbound.current_interrupt_mask; | |
82 | info->inbound.read_idx = debug_info.inbound.current_read_index; | |
83 | info->inbound.write_idx = debug_info.inbound.current_write_index; | |
84 | info->inbound.bytes_avail_toread = | |
85 | debug_info.inbound.bytes_avail_toread; | |
86 | info->inbound.bytes_avail_towrite = | |
87 | debug_info.inbound.bytes_avail_towrite; | |
3e7ee490 | 88 | |
98db4335 S |
89 | info->outbound.int_mask = |
90 | debug_info.outbound.current_interrupt_mask; | |
91 | info->outbound.read_idx = debug_info.outbound.current_read_index; | |
92 | info->outbound.write_idx = debug_info.outbound.current_write_index; | |
93 | info->outbound.bytes_avail_toread = | |
94 | debug_info.outbound.bytes_avail_toread; | |
95 | info->outbound.bytes_avail_towrite = | |
96 | debug_info.outbound.bytes_avail_towrite; | |
97 | } | |
3e7ee490 | 98 | |
98db4335 S |
99 | /* |
100 | * vmbus_show_device_attr - Show the device attribute in sysfs. | |
101 | * | |
102 | * This is invoked when user does a | |
103 | * "cat /sys/bus/vmbus/devices/<busdevice>/<attr name>" | |
104 | */ | |
90c9960e GKH |
105 | static ssize_t vmbus_show_device_attr(struct device *dev, |
106 | struct device_attribute *dev_attr, | |
98db4335 S |
107 | char *buf) |
108 | { | |
e8e27047 | 109 | struct hv_device *hv_dev = device_to_hv_device(dev); |
98db4335 | 110 | struct hv_device_info device_info; |
3e7ee490 | 111 | |
98db4335 | 112 | memset(&device_info, 0, sizeof(struct hv_device_info)); |
3e7ee490 | 113 | |
e8e27047 | 114 | get_channel_info(hv_dev, &device_info); |
3e7ee490 | 115 | |
98db4335 S |
116 | if (!strcmp(dev_attr->attr.name, "class_id")) { |
117 | return sprintf(buf, "{%02x%02x%02x%02x-%02x%02x-%02x%02x-" | |
118 | "%02x%02x%02x%02x%02x%02x%02x%02x}\n", | |
119 | device_info.chn_type.data[3], | |
120 | device_info.chn_type.data[2], | |
121 | device_info.chn_type.data[1], | |
122 | device_info.chn_type.data[0], | |
123 | device_info.chn_type.data[5], | |
124 | device_info.chn_type.data[4], | |
125 | device_info.chn_type.data[7], | |
126 | device_info.chn_type.data[6], | |
127 | device_info.chn_type.data[8], | |
128 | device_info.chn_type.data[9], | |
129 | device_info.chn_type.data[10], | |
130 | device_info.chn_type.data[11], | |
131 | device_info.chn_type.data[12], | |
132 | device_info.chn_type.data[13], | |
133 | device_info.chn_type.data[14], | |
134 | device_info.chn_type.data[15]); | |
135 | } else if (!strcmp(dev_attr->attr.name, "device_id")) { | |
136 | return sprintf(buf, "{%02x%02x%02x%02x-%02x%02x-%02x%02x-" | |
137 | "%02x%02x%02x%02x%02x%02x%02x%02x}\n", | |
138 | device_info.chn_instance.data[3], | |
139 | device_info.chn_instance.data[2], | |
140 | device_info.chn_instance.data[1], | |
141 | device_info.chn_instance.data[0], | |
142 | device_info.chn_instance.data[5], | |
143 | device_info.chn_instance.data[4], | |
144 | device_info.chn_instance.data[7], | |
145 | device_info.chn_instance.data[6], | |
146 | device_info.chn_instance.data[8], | |
147 | device_info.chn_instance.data[9], | |
148 | device_info.chn_instance.data[10], | |
149 | device_info.chn_instance.data[11], | |
150 | device_info.chn_instance.data[12], | |
151 | device_info.chn_instance.data[13], | |
152 | device_info.chn_instance.data[14], | |
153 | device_info.chn_instance.data[15]); | |
154 | } else if (!strcmp(dev_attr->attr.name, "state")) { | |
155 | return sprintf(buf, "%d\n", device_info.chn_state); | |
156 | } else if (!strcmp(dev_attr->attr.name, "id")) { | |
157 | return sprintf(buf, "%d\n", device_info.chn_id); | |
158 | } else if (!strcmp(dev_attr->attr.name, "out_intr_mask")) { | |
159 | return sprintf(buf, "%d\n", device_info.outbound.int_mask); | |
160 | } else if (!strcmp(dev_attr->attr.name, "out_read_index")) { | |
161 | return sprintf(buf, "%d\n", device_info.outbound.read_idx); | |
162 | } else if (!strcmp(dev_attr->attr.name, "out_write_index")) { | |
163 | return sprintf(buf, "%d\n", device_info.outbound.write_idx); | |
164 | } else if (!strcmp(dev_attr->attr.name, "out_read_bytes_avail")) { | |
165 | return sprintf(buf, "%d\n", | |
166 | device_info.outbound.bytes_avail_toread); | |
167 | } else if (!strcmp(dev_attr->attr.name, "out_write_bytes_avail")) { | |
168 | return sprintf(buf, "%d\n", | |
169 | device_info.outbound.bytes_avail_towrite); | |
170 | } else if (!strcmp(dev_attr->attr.name, "in_intr_mask")) { | |
171 | return sprintf(buf, "%d\n", device_info.inbound.int_mask); | |
172 | } else if (!strcmp(dev_attr->attr.name, "in_read_index")) { | |
173 | return sprintf(buf, "%d\n", device_info.inbound.read_idx); | |
174 | } else if (!strcmp(dev_attr->attr.name, "in_write_index")) { | |
175 | return sprintf(buf, "%d\n", device_info.inbound.write_idx); | |
176 | } else if (!strcmp(dev_attr->attr.name, "in_read_bytes_avail")) { | |
177 | return sprintf(buf, "%d\n", | |
178 | device_info.inbound.bytes_avail_toread); | |
179 | } else if (!strcmp(dev_attr->attr.name, "in_write_bytes_avail")) { | |
180 | return sprintf(buf, "%d\n", | |
181 | device_info.inbound.bytes_avail_towrite); | |
182 | } else if (!strcmp(dev_attr->attr.name, "monitor_id")) { | |
183 | return sprintf(buf, "%d\n", device_info.monitor_id); | |
184 | } else if (!strcmp(dev_attr->attr.name, "server_monitor_pending")) { | |
185 | return sprintf(buf, "%d\n", device_info.server_monitor_pending); | |
186 | } else if (!strcmp(dev_attr->attr.name, "server_monitor_latency")) { | |
187 | return sprintf(buf, "%d\n", device_info.server_monitor_latency); | |
188 | } else if (!strcmp(dev_attr->attr.name, "server_monitor_conn_id")) { | |
189 | return sprintf(buf, "%d\n", | |
190 | device_info.server_monitor_conn_id); | |
191 | } else if (!strcmp(dev_attr->attr.name, "client_monitor_pending")) { | |
192 | return sprintf(buf, "%d\n", device_info.client_monitor_pending); | |
193 | } else if (!strcmp(dev_attr->attr.name, "client_monitor_latency")) { | |
194 | return sprintf(buf, "%d\n", device_info.client_monitor_latency); | |
195 | } else if (!strcmp(dev_attr->attr.name, "client_monitor_conn_id")) { | |
196 | return sprintf(buf, "%d\n", | |
197 | device_info.client_monitor_conn_id); | |
198 | } else { | |
199 | return 0; | |
200 | } | |
201 | } | |
3e7ee490 | 202 | |
454f18a9 | 203 | /* Set up per device attributes in /sys/bus/vmbus/devices/<bus device> */ |
3e7ee490 HJ |
204 | static struct device_attribute vmbus_device_attrs[] = { |
205 | __ATTR(id, S_IRUGO, vmbus_show_device_attr, NULL), | |
206 | __ATTR(state, S_IRUGO, vmbus_show_device_attr, NULL), | |
207 | __ATTR(class_id, S_IRUGO, vmbus_show_device_attr, NULL), | |
208 | __ATTR(device_id, S_IRUGO, vmbus_show_device_attr, NULL), | |
209 | __ATTR(monitor_id, S_IRUGO, vmbus_show_device_attr, NULL), | |
210 | ||
211 | __ATTR(server_monitor_pending, S_IRUGO, vmbus_show_device_attr, NULL), | |
212 | __ATTR(server_monitor_latency, S_IRUGO, vmbus_show_device_attr, NULL), | |
213 | __ATTR(server_monitor_conn_id, S_IRUGO, vmbus_show_device_attr, NULL), | |
214 | ||
215 | __ATTR(client_monitor_pending, S_IRUGO, vmbus_show_device_attr, NULL), | |
216 | __ATTR(client_monitor_latency, S_IRUGO, vmbus_show_device_attr, NULL), | |
217 | __ATTR(client_monitor_conn_id, S_IRUGO, vmbus_show_device_attr, NULL), | |
218 | ||
219 | __ATTR(out_intr_mask, S_IRUGO, vmbus_show_device_attr, NULL), | |
220 | __ATTR(out_read_index, S_IRUGO, vmbus_show_device_attr, NULL), | |
221 | __ATTR(out_write_index, S_IRUGO, vmbus_show_device_attr, NULL), | |
222 | __ATTR(out_read_bytes_avail, S_IRUGO, vmbus_show_device_attr, NULL), | |
223 | __ATTR(out_write_bytes_avail, S_IRUGO, vmbus_show_device_attr, NULL), | |
224 | ||
225 | __ATTR(in_intr_mask, S_IRUGO, vmbus_show_device_attr, NULL), | |
226 | __ATTR(in_read_index, S_IRUGO, vmbus_show_device_attr, NULL), | |
227 | __ATTR(in_write_index, S_IRUGO, vmbus_show_device_attr, NULL), | |
228 | __ATTR(in_read_bytes_avail, S_IRUGO, vmbus_show_device_attr, NULL), | |
229 | __ATTR(in_write_bytes_avail, S_IRUGO, vmbus_show_device_attr, NULL), | |
230 | __ATTR_NULL | |
231 | }; | |
3e7ee490 | 232 | |
793be9c7 | 233 | |
adde2487 S |
234 | /* |
235 | * vmbus_uevent - add uevent for our device | |
236 | * | |
237 | * This routine is invoked when a device is added or removed on the vmbus to | |
238 | * generate a uevent to udev in the userspace. The udev will then look at its | |
239 | * rule and the uevent generated here to load the appropriate driver | |
240 | */ | |
241 | static int vmbus_uevent(struct device *device, struct kobj_uevent_env *env) | |
242 | { | |
243 | struct hv_device *dev = device_to_hv_device(device); | |
244 | int ret; | |
245 | ||
adde2487 S |
246 | ret = add_uevent_var(env, "VMBUS_DEVICE_CLASS_GUID={" |
247 | "%02x%02x%02x%02x-%02x%02x-%02x%02x-" | |
248 | "%02x%02x%02x%02x%02x%02x%02x%02x}", | |
249 | dev->dev_type.data[3], | |
250 | dev->dev_type.data[2], | |
251 | dev->dev_type.data[1], | |
252 | dev->dev_type.data[0], | |
253 | dev->dev_type.data[5], | |
254 | dev->dev_type.data[4], | |
255 | dev->dev_type.data[7], | |
256 | dev->dev_type.data[6], | |
257 | dev->dev_type.data[8], | |
258 | dev->dev_type.data[9], | |
259 | dev->dev_type.data[10], | |
260 | dev->dev_type.data[11], | |
261 | dev->dev_type.data[12], | |
262 | dev->dev_type.data[13], | |
263 | dev->dev_type.data[14], | |
264 | dev->dev_type.data[15]); | |
265 | ||
266 | if (ret) | |
267 | return ret; | |
268 | ||
269 | ret = add_uevent_var(env, "VMBUS_DEVICE_DEVICE_GUID={" | |
270 | "%02x%02x%02x%02x-%02x%02x-%02x%02x-" | |
271 | "%02x%02x%02x%02x%02x%02x%02x%02x}", | |
272 | dev->dev_instance.data[3], | |
273 | dev->dev_instance.data[2], | |
274 | dev->dev_instance.data[1], | |
275 | dev->dev_instance.data[0], | |
276 | dev->dev_instance.data[5], | |
277 | dev->dev_instance.data[4], | |
278 | dev->dev_instance.data[7], | |
279 | dev->dev_instance.data[6], | |
280 | dev->dev_instance.data[8], | |
281 | dev->dev_instance.data[9], | |
282 | dev->dev_instance.data[10], | |
283 | dev->dev_instance.data[11], | |
284 | dev->dev_instance.data[12], | |
285 | dev->dev_instance.data[13], | |
286 | dev->dev_instance.data[14], | |
287 | dev->dev_instance.data[15]); | |
288 | if (ret) | |
289 | return ret; | |
290 | ||
291 | return 0; | |
292 | } | |
293 | ||
b7fc147b S |
294 | |
295 | /* | |
296 | * vmbus_match - Attempt to match the specified device to the specified driver | |
297 | */ | |
298 | static int vmbus_match(struct device *device, struct device_driver *driver) | |
299 | { | |
300 | int match = 0; | |
301 | struct hv_driver *drv = drv_to_hv_drv(driver); | |
e8e27047 | 302 | struct hv_device *hv_dev = device_to_hv_device(device); |
b7fc147b S |
303 | |
304 | /* We found our driver ? */ | |
e8e27047 | 305 | if (memcmp(&hv_dev->dev_type, &drv->dev_type, |
de632a2b | 306 | sizeof(struct hv_guid)) == 0) |
b7fc147b | 307 | match = 1; |
de632a2b | 308 | |
b7fc147b S |
309 | return match; |
310 | } | |
311 | ||
f1f0d67b S |
312 | /* |
313 | * vmbus_probe - Add the new vmbus's child device | |
314 | */ | |
315 | static int vmbus_probe(struct device *child_device) | |
316 | { | |
317 | int ret = 0; | |
318 | struct hv_driver *drv = | |
319 | drv_to_hv_drv(child_device->driver); | |
9efd21e1 | 320 | struct hv_device *dev = device_to_hv_device(child_device); |
f1f0d67b | 321 | |
9efd21e1 S |
322 | if (drv->probe) { |
323 | ret = drv->probe(dev); | |
b14a7b30 | 324 | if (ret != 0) |
0a46618d HJ |
325 | pr_err("probe failed for device %s (%d)\n", |
326 | dev_name(child_device), ret); | |
f1f0d67b | 327 | |
f1f0d67b | 328 | } else { |
0a46618d HJ |
329 | pr_err("probe not set for driver %s\n", |
330 | dev_name(child_device)); | |
6de925b1 | 331 | ret = -ENODEV; |
f1f0d67b S |
332 | } |
333 | return ret; | |
334 | } | |
335 | ||
c5dce3db S |
336 | /* |
337 | * vmbus_remove - Remove a vmbus device | |
338 | */ | |
339 | static int vmbus_remove(struct device *child_device) | |
340 | { | |
341 | int ret; | |
342 | struct hv_driver *drv; | |
343 | ||
415b023a | 344 | struct hv_device *dev = device_to_hv_device(child_device); |
c5dce3db S |
345 | |
346 | if (child_device->driver) { | |
347 | drv = drv_to_hv_drv(child_device->driver); | |
348 | ||
415b023a S |
349 | if (drv->remove) { |
350 | ret = drv->remove(dev); | |
c5dce3db | 351 | } else { |
0a46618d HJ |
352 | pr_err("remove not set for driver %s\n", |
353 | dev_name(child_device)); | |
6de925b1 | 354 | ret = -ENODEV; |
c5dce3db S |
355 | } |
356 | } | |
357 | ||
358 | return 0; | |
359 | } | |
360 | ||
eb1bb259 S |
361 | |
362 | /* | |
363 | * vmbus_shutdown - Shutdown a vmbus device | |
364 | */ | |
365 | static void vmbus_shutdown(struct device *child_device) | |
366 | { | |
367 | struct hv_driver *drv; | |
ca6887fb | 368 | struct hv_device *dev = device_to_hv_device(child_device); |
eb1bb259 S |
369 | |
370 | ||
371 | /* The device may not be attached yet */ | |
372 | if (!child_device->driver) | |
373 | return; | |
374 | ||
375 | drv = drv_to_hv_drv(child_device->driver); | |
376 | ||
ca6887fb S |
377 | if (drv->shutdown) |
378 | drv->shutdown(dev); | |
eb1bb259 S |
379 | |
380 | return; | |
381 | } | |
382 | ||
086e7a56 S |
383 | |
384 | /* | |
385 | * vmbus_device_release - Final callback release of the vmbus child device | |
386 | */ | |
387 | static void vmbus_device_release(struct device *device) | |
388 | { | |
e8e27047 | 389 | struct hv_device *hv_dev = device_to_hv_device(device); |
086e7a56 | 390 | |
e8e27047 | 391 | kfree(hv_dev); |
086e7a56 S |
392 | |
393 | } | |
394 | ||
454f18a9 | 395 | /* The one and only one */ |
9adcac5c S |
396 | static struct bus_type hv_bus = { |
397 | .name = "vmbus", | |
398 | .match = vmbus_match, | |
399 | .shutdown = vmbus_shutdown, | |
400 | .remove = vmbus_remove, | |
401 | .probe = vmbus_probe, | |
402 | .uevent = vmbus_uevent, | |
403 | .dev_attrs = vmbus_device_attrs, | |
3e7ee490 HJ |
404 | }; |
405 | ||
adf874cb | 406 | static const char *driver_name = "hyperv"; |
36199a99 | 407 | |
36199a99 | 408 | |
bf6506f6 TT |
409 | struct onmessage_work_context { |
410 | struct work_struct work; | |
411 | struct hv_message msg; | |
412 | }; | |
413 | ||
414 | static void vmbus_onmessage_work(struct work_struct *work) | |
415 | { | |
416 | struct onmessage_work_context *ctx; | |
417 | ||
418 | ctx = container_of(work, struct onmessage_work_context, | |
419 | work); | |
420 | vmbus_onmessage(&ctx->msg); | |
421 | kfree(ctx); | |
422 | } | |
423 | ||
36199a99 GKH |
424 | /* |
425 | * vmbus_on_msg_dpc - DPC routine to handle messages from the hypervisior | |
426 | */ | |
62c1059d | 427 | static void vmbus_on_msg_dpc(unsigned long data) |
36199a99 GKH |
428 | { |
429 | int cpu = smp_processor_id(); | |
430 | void *page_addr = hv_context.synic_message_page[cpu]; | |
431 | struct hv_message *msg = (struct hv_message *)page_addr + | |
432 | VMBUS_MESSAGE_SINT; | |
bf6506f6 | 433 | struct onmessage_work_context *ctx; |
36199a99 GKH |
434 | |
435 | while (1) { | |
436 | if (msg->header.message_type == HVMSG_NONE) { | |
437 | /* no msg */ | |
438 | break; | |
439 | } else { | |
bf6506f6 TT |
440 | ctx = kmalloc(sizeof(*ctx), GFP_ATOMIC); |
441 | if (ctx == NULL) | |
36199a99 | 442 | continue; |
bf6506f6 TT |
443 | INIT_WORK(&ctx->work, vmbus_onmessage_work); |
444 | memcpy(&ctx->msg, msg, sizeof(*msg)); | |
da9fcb72 | 445 | queue_work(vmbus_connection.work_queue, &ctx->work); |
36199a99 GKH |
446 | } |
447 | ||
448 | msg->header.message_type = HVMSG_NONE; | |
449 | ||
450 | /* | |
451 | * Make sure the write to MessageType (ie set to | |
452 | * HVMSG_NONE) happens before we read the | |
453 | * MessagePending and EOMing. Otherwise, the EOMing | |
454 | * will not deliver any more messages since there is | |
455 | * no empty slot | |
456 | */ | |
e826f1d5 | 457 | smp_mb(); |
36199a99 GKH |
458 | |
459 | if (msg->header.message_flags.msg_pending) { | |
460 | /* | |
461 | * This will cause message queue rescan to | |
462 | * possibly deliver another msg from the | |
463 | * hypervisor | |
464 | */ | |
465 | wrmsrl(HV_X64_MSR_EOM, 0); | |
466 | } | |
467 | } | |
468 | } | |
469 | ||
36199a99 GKH |
470 | /* |
471 | * vmbus_on_isr - ISR routine | |
472 | */ | |
480ae58d | 473 | static int vmbus_on_isr(void) |
36199a99 GKH |
474 | { |
475 | int ret = 0; | |
476 | int cpu = smp_processor_id(); | |
477 | void *page_addr; | |
478 | struct hv_message *msg; | |
479 | union hv_synic_event_flags *event; | |
480 | ||
481 | page_addr = hv_context.synic_message_page[cpu]; | |
482 | msg = (struct hv_message *)page_addr + VMBUS_MESSAGE_SINT; | |
483 | ||
484 | /* Check if there are actual msgs to be process */ | |
98e08702 | 485 | if (msg->header.message_type != HVMSG_NONE) |
36199a99 | 486 | ret |= 0x1; |
36199a99 | 487 | |
36199a99 GKH |
488 | page_addr = hv_context.synic_event_page[cpu]; |
489 | event = (union hv_synic_event_flags *)page_addr + VMBUS_MESSAGE_SINT; | |
490 | ||
491 | /* Since we are a child, we only need to check bit 0 */ | |
32235b07 | 492 | if (sync_test_and_clear_bit(0, (unsigned long *) &event->flags32[0])) |
36199a99 | 493 | ret |= 0x2; |
36199a99 GKH |
494 | |
495 | return ret; | |
496 | } | |
497 | ||
793be9c7 S |
498 | |
499 | static irqreturn_t vmbus_isr(int irq, void *dev_id) | |
500 | { | |
501 | int ret; | |
502 | ||
503 | ret = vmbus_on_isr(); | |
504 | ||
505 | /* Schedules a dpc if necessary */ | |
506 | if (ret > 0) { | |
507 | if (test_bit(0, (unsigned long *)&ret)) | |
59c0e4f0 | 508 | tasklet_schedule(&msg_dpc); |
793be9c7 S |
509 | |
510 | if (test_bit(1, (unsigned long *)&ret)) | |
66d9229c | 511 | tasklet_schedule(&event_dpc); |
793be9c7 S |
512 | |
513 | return IRQ_HANDLED; | |
514 | } else { | |
515 | return IRQ_NONE; | |
516 | } | |
517 | } | |
518 | ||
3e189519 | 519 | /* |
90c9960e GKH |
520 | * vmbus_bus_init -Main vmbus driver initialization routine. |
521 | * | |
522 | * Here, we | |
0686e4f4 | 523 | * - initialize the vmbus driver context |
0686e4f4 LL |
524 | * - invoke the vmbus hv main init routine |
525 | * - get the irq resource | |
0686e4f4 | 526 | * - retrieve the channel offers |
90c9960e | 527 | */ |
9aaa995e | 528 | static int vmbus_bus_init(int irq) |
3e7ee490 | 529 | { |
90c9960e GKH |
530 | int ret; |
531 | unsigned int vector; | |
3e7ee490 | 532 | |
6d26e38f GKH |
533 | /* Hypervisor initialization...setup hypercall page..etc */ |
534 | ret = hv_init(); | |
90c9960e | 535 | if (ret != 0) { |
0a46618d | 536 | pr_err("Unable to initialize the hypervisor - 0x%x\n", ret); |
d6c1c5de | 537 | return ret; |
3e7ee490 HJ |
538 | } |
539 | ||
454f18a9 | 540 | /* Initialize the bus context */ |
59c0e4f0 | 541 | tasklet_init(&msg_dpc, vmbus_on_msg_dpc, 0); |
66d9229c | 542 | tasklet_init(&event_dpc, vmbus_on_event, 0); |
3e7ee490 | 543 | |
a6e4d8e3 | 544 | /* Now, register the bus with LDM */ |
9adcac5c | 545 | ret = bus_register(&hv_bus); |
d6c1c5de S |
546 | if (ret) |
547 | return ret; | |
3e7ee490 | 548 | |
454f18a9 | 549 | /* Get the interrupt resource */ |
3d2de267 | 550 | ret = request_irq(irq, vmbus_isr, IRQF_SAMPLE_RANDOM, |
607c1a11 | 551 | driver_name, hv_acpi_dev); |
3e7ee490 | 552 | |
90c9960e | 553 | if (ret != 0) { |
0a46618d | 554 | pr_err("Unable to request IRQ %d\n", |
9aaa995e | 555 | irq); |
3e7ee490 | 556 | |
9adcac5c | 557 | bus_unregister(&hv_bus); |
3e7ee490 | 558 | |
d6c1c5de | 559 | return ret; |
3e7ee490 | 560 | } |
3e7ee490 | 561 | |
9aaa995e | 562 | vector = IRQ0_VECTOR + irq; |
3e7ee490 | 563 | |
800b6902 S |
564 | /* |
565 | * Notify the hypervisor of our irq and | |
566 | * connect to the host. | |
567 | */ | |
568 | on_each_cpu(hv_synic_init, (void *)&vector, 1); | |
569 | ret = vmbus_connect(); | |
90c9960e | 570 | if (ret) { |
607c1a11 | 571 | free_irq(irq, hv_acpi_dev); |
9adcac5c | 572 | bus_unregister(&hv_bus); |
d6c1c5de | 573 | return ret; |
5d48a1c2 BP |
574 | } |
575 | ||
800b6902 | 576 | |
2d6e882b | 577 | vmbus_request_offers(); |
8b5d6d3b | 578 | |
d6c1c5de | 579 | return 0; |
3e7ee490 HJ |
580 | } |
581 | ||
90c9960e | 582 | /** |
3e189519 | 583 | * vmbus_child_driver_register() - Register a vmbus's child driver |
c643269d | 584 | * @drv: Pointer to driver structure you want to register |
3e189519 | 585 | * |
3e189519 HJ |
586 | * |
587 | * Registers the given driver with Linux through the 'driver_register()' call | |
588 | * And sets up the hyper-v vmbus handling for this driver. | |
589 | * It will return the state of the 'driver_register()' call. | |
590 | * | |
591 | * Mainly used by Hyper-V drivers. | |
90c9960e | 592 | */ |
c643269d | 593 | int vmbus_child_driver_register(struct device_driver *drv) |
3e7ee490 | 594 | { |
5d48a1c2 | 595 | int ret; |
3e7ee490 | 596 | |
0a46618d | 597 | pr_info("child driver registering - name %s\n", drv->name); |
3e7ee490 | 598 | |
454f18a9 | 599 | /* The child driver on this vmbus */ |
9adcac5c | 600 | drv->bus = &hv_bus; |
3e7ee490 | 601 | |
c643269d | 602 | ret = driver_register(drv); |
3e7ee490 | 603 | |
2d6e882b | 604 | vmbus_request_offers(); |
3e7ee490 | 605 | |
5d48a1c2 | 606 | return ret; |
3e7ee490 | 607 | } |
3e7ee490 HJ |
608 | EXPORT_SYMBOL(vmbus_child_driver_register); |
609 | ||
90c9960e | 610 | /** |
3e189519 | 611 | * vmbus_child_driver_unregister() - Unregister a vmbus's child driver |
06de23f7 | 612 | * @drv: Pointer to driver structure you want to un-register |
3e189519 | 613 | * |
3e189519 HJ |
614 | * |
615 | * Un-register the given driver with Linux through the 'driver_unregister()' | |
616 | * call. And ungegisters the driver from the Hyper-V vmbus handler. | |
617 | * | |
618 | * Mainly used by Hyper-V drivers. | |
90c9960e | 619 | */ |
06de23f7 | 620 | void vmbus_child_driver_unregister(struct device_driver *drv) |
3e7ee490 | 621 | { |
0a46618d | 622 | pr_info("child driver unregistering - name %s\n", drv->name); |
3e7ee490 | 623 | |
06de23f7 | 624 | driver_unregister(drv); |
3e7ee490 | 625 | |
3e7ee490 | 626 | } |
3e7ee490 HJ |
627 | EXPORT_SYMBOL(vmbus_child_driver_unregister); |
628 | ||
3e189519 HJ |
629 | /* |
630 | * vmbus_child_device_create - Creates and registers a new child device | |
631 | * on the vmbus. | |
90c9960e | 632 | */ |
89733aa9 GKH |
633 | struct hv_device *vmbus_child_device_create(struct hv_guid *type, |
634 | struct hv_guid *instance, | |
635 | struct vmbus_channel *channel) | |
3e7ee490 | 636 | { |
3d3b5518 | 637 | struct hv_device *child_device_obj; |
3e7ee490 | 638 | |
454f18a9 | 639 | /* Allocate the new child device */ |
6bad88da S |
640 | child_device_obj = kzalloc(sizeof(struct hv_device), GFP_KERNEL); |
641 | if (!child_device_obj) { | |
0a46618d | 642 | pr_err("Unable to allocate device object for child device\n"); |
3e7ee490 HJ |
643 | return NULL; |
644 | } | |
645 | ||
cae5b843 | 646 | child_device_obj->channel = channel; |
ca623ad3 HZ |
647 | memcpy(&child_device_obj->dev_type, type, sizeof(struct hv_guid)); |
648 | memcpy(&child_device_obj->dev_instance, instance, | |
90c9960e | 649 | sizeof(struct hv_guid)); |
3e7ee490 | 650 | |
3e7ee490 | 651 | |
3e7ee490 HJ |
652 | return child_device_obj; |
653 | } | |
654 | ||
3e189519 | 655 | /* |
e13a0b5a | 656 | * vmbus_child_device_register - Register the child device |
90c9960e | 657 | */ |
3ca07cb0 | 658 | int vmbus_child_device_register(struct hv_device *child_device_obj) |
3e7ee490 | 659 | { |
90c9960e | 660 | int ret = 0; |
6bad88da | 661 | |
f4888417 | 662 | static atomic_t device_num = ATOMIC_INIT(0); |
3e7ee490 | 663 | |
1bb40a25 | 664 | /* Set the device name. Otherwise, device_register() will fail. */ |
6bad88da | 665 | dev_set_name(&child_device_obj->device, "vmbus_0_%d", |
90c9960e | 666 | atomic_inc_return(&device_num)); |
3e7ee490 | 667 | |
454f18a9 | 668 | /* The new device belongs to this bus */ |
9adcac5c | 669 | child_device_obj->device.bus = &hv_bus; /* device->dev.bus; */ |
607c1a11 | 670 | child_device_obj->device.parent = &hv_acpi_dev->dev; |
6bad88da | 671 | child_device_obj->device.release = vmbus_device_release; |
3e7ee490 | 672 | |
90c9960e GKH |
673 | /* |
674 | * Register with the LDM. This will kick off the driver/device | |
675 | * binding...which will eventually call vmbus_match() and vmbus_probe() | |
676 | */ | |
6bad88da | 677 | ret = device_register(&child_device_obj->device); |
3e7ee490 | 678 | |
3e7ee490 | 679 | if (ret) |
0a46618d | 680 | pr_err("Unable to register child device\n"); |
3e7ee490 | 681 | else |
0a46618d HJ |
682 | pr_info("child device %s registered\n", |
683 | dev_name(&child_device_obj->device)); | |
3e7ee490 | 684 | |
3e7ee490 HJ |
685 | return ret; |
686 | } | |
687 | ||
3e189519 HJ |
688 | /* |
689 | * vmbus_child_device_unregister - Remove the specified child device | |
690 | * from the vmbus. | |
90c9960e | 691 | */ |
9d8bd71a | 692 | void vmbus_child_device_unregister(struct hv_device *device_obj) |
3e7ee490 | 693 | { |
90c9960e GKH |
694 | /* |
695 | * Kick off the process of unregistering the device. | |
696 | * This will call vmbus_remove() and eventually vmbus_device_release() | |
697 | */ | |
6bad88da | 698 | device_unregister(&device_obj->device); |
3e7ee490 | 699 | |
0a46618d HJ |
700 | pr_info("child device %s unregistered\n", |
701 | dev_name(&device_obj->device)); | |
3e7ee490 HJ |
702 | } |
703 | ||
3e7ee490 | 704 | |
b0069f43 S |
705 | /* |
706 | * VMBUS is an acpi enumerated device. Get the the IRQ information | |
707 | * from DSDT. | |
708 | */ | |
709 | ||
710 | static acpi_status vmbus_walk_resources(struct acpi_resource *res, void *irq) | |
711 | { | |
712 | ||
713 | if (res->type == ACPI_RESOURCE_TYPE_IRQ) { | |
714 | struct acpi_resource_irq *irqp; | |
715 | irqp = &res->data.irq; | |
716 | ||
717 | *((unsigned int *)irq) = irqp->interrupts[0]; | |
718 | } | |
719 | ||
720 | return AE_OK; | |
721 | } | |
722 | ||
723 | static int vmbus_acpi_add(struct acpi_device *device) | |
724 | { | |
725 | acpi_status result; | |
726 | ||
607c1a11 S |
727 | hv_acpi_dev = device; |
728 | ||
b0069f43 S |
729 | result = |
730 | acpi_walk_resources(device->handle, METHOD_NAME__CRS, | |
731 | vmbus_walk_resources, &irq); | |
732 | ||
733 | if (ACPI_FAILURE(result)) { | |
734 | complete(&probe_event); | |
735 | return -ENODEV; | |
736 | } | |
737 | complete(&probe_event); | |
738 | return 0; | |
739 | } | |
740 | ||
741 | static const struct acpi_device_id vmbus_acpi_device_ids[] = { | |
742 | {"VMBUS", 0}, | |
9d7b18d1 | 743 | {"VMBus", 0}, |
b0069f43 S |
744 | {"", 0}, |
745 | }; | |
746 | MODULE_DEVICE_TABLE(acpi, vmbus_acpi_device_ids); | |
747 | ||
748 | static struct acpi_driver vmbus_acpi_driver = { | |
749 | .name = "vmbus", | |
750 | .ids = vmbus_acpi_device_ids, | |
751 | .ops = { | |
752 | .add = vmbus_acpi_add, | |
753 | }, | |
754 | }; | |
755 | ||
607c1a11 | 756 | static int __init hv_acpi_init(void) |
1168ac22 | 757 | { |
2dda95f8 | 758 | int ret, t; |
b0069f43 S |
759 | |
760 | init_completion(&probe_event); | |
761 | ||
762 | /* | |
763 | * Get irq resources first. | |
764 | */ | |
765 | ||
0246604c S |
766 | ret = acpi_bus_register_driver(&vmbus_acpi_driver); |
767 | ||
b0069f43 S |
768 | if (ret) |
769 | return ret; | |
770 | ||
2dda95f8 S |
771 | t = wait_for_completion_timeout(&probe_event, 5*HZ); |
772 | if (t == 0) { | |
773 | ret = -ETIMEDOUT; | |
774 | goto cleanup; | |
775 | } | |
b0069f43 S |
776 | |
777 | if (irq <= 0) { | |
2dda95f8 S |
778 | ret = -ENODEV; |
779 | goto cleanup; | |
b0069f43 S |
780 | } |
781 | ||
91fd799e S |
782 | ret = vmbus_bus_init(irq); |
783 | if (ret) | |
2dda95f8 S |
784 | goto cleanup; |
785 | ||
786 | return 0; | |
787 | ||
788 | cleanup: | |
789 | acpi_bus_unregister_driver(&vmbus_acpi_driver); | |
91fd799e | 790 | return ret; |
1168ac22 S |
791 | } |
792 | ||
1168ac22 | 793 | |
90c9960e | 794 | MODULE_LICENSE("GPL"); |
26c14cc1 | 795 | MODULE_VERSION(HV_DRV_VERSION); |
13399cba | 796 | module_param(vmbus_loglevel, int, S_IRUGO|S_IWUSR); |
3e7ee490 | 797 | |
607c1a11 | 798 | module_init(hv_acpi_init); |