]>
Commit | Line | Data |
---|---|---|
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> | |
5a0e3ad6 | 31 | #include <linux/slab.h> |
b0069f43 S |
32 | #include <linux/acpi.h> |
33 | #include <acpi/acpi_bus.h> | |
8b5d6d3b | 34 | #include <linux/completion.h> |
3f335ea2 S |
35 | |
36 | #include "hyperv.h" | |
0f2a6619 | 37 | #include "hyperv_vmbus.h" |
3e7ee490 | 38 | |
3e7ee490 | 39 | |
607c1a11 | 40 | static struct acpi_device *hv_acpi_dev; |
1168ac22 | 41 | |
59c0e4f0 | 42 | static struct tasklet_struct msg_dpc; |
66d9229c | 43 | static struct tasklet_struct event_dpc; |
59c0e4f0 | 44 | |
98db4335 S |
45 | unsigned int vmbus_loglevel = (ALL_MODULES << 16 | INFO_LVL); |
46 | EXPORT_SYMBOL(vmbus_loglevel); | |
98db4335 | 47 | |
71a6655d | 48 | static struct completion probe_event; |
b0069f43 | 49 | static int irq; |
98db4335 S |
50 | |
51 | static void get_channel_info(struct hv_device *device, | |
52 | struct hv_device_info *info) | |
53 | { | |
54 | struct vmbus_channel_debug_info debug_info; | |
55 | ||
56 | if (!device->channel) | |
57 | return; | |
58 | ||
59 | vmbus_get_debug_info(device->channel, &debug_info); | |
60 | ||
61 | info->chn_id = debug_info.relid; | |
62 | info->chn_state = debug_info.state; | |
63 | memcpy(&info->chn_type, &debug_info.interfacetype, | |
358d2ee2 | 64 | sizeof(uuid_le)); |
98db4335 | 65 | memcpy(&info->chn_instance, &debug_info.interface_instance, |
358d2ee2 | 66 | sizeof(uuid_le)); |
98db4335 S |
67 | |
68 | info->monitor_id = debug_info.monitorid; | |
69 | ||
70 | info->server_monitor_pending = debug_info.servermonitor_pending; | |
71 | info->server_monitor_latency = debug_info.servermonitor_latency; | |
72 | info->server_monitor_conn_id = debug_info.servermonitor_connectionid; | |
73 | ||
74 | info->client_monitor_pending = debug_info.clientmonitor_pending; | |
75 | info->client_monitor_latency = debug_info.clientmonitor_latency; | |
76 | info->client_monitor_conn_id = debug_info.clientmonitor_connectionid; | |
77 | ||
78 | info->inbound.int_mask = debug_info.inbound.current_interrupt_mask; | |
79 | info->inbound.read_idx = debug_info.inbound.current_read_index; | |
80 | info->inbound.write_idx = debug_info.inbound.current_write_index; | |
81 | info->inbound.bytes_avail_toread = | |
82 | debug_info.inbound.bytes_avail_toread; | |
83 | info->inbound.bytes_avail_towrite = | |
84 | debug_info.inbound.bytes_avail_towrite; | |
3e7ee490 | 85 | |
98db4335 S |
86 | info->outbound.int_mask = |
87 | debug_info.outbound.current_interrupt_mask; | |
88 | info->outbound.read_idx = debug_info.outbound.current_read_index; | |
89 | info->outbound.write_idx = debug_info.outbound.current_write_index; | |
90 | info->outbound.bytes_avail_toread = | |
91 | debug_info.outbound.bytes_avail_toread; | |
92 | info->outbound.bytes_avail_towrite = | |
93 | debug_info.outbound.bytes_avail_towrite; | |
94 | } | |
3e7ee490 | 95 | |
98db4335 S |
96 | /* |
97 | * vmbus_show_device_attr - Show the device attribute in sysfs. | |
98 | * | |
99 | * This is invoked when user does a | |
100 | * "cat /sys/bus/vmbus/devices/<busdevice>/<attr name>" | |
101 | */ | |
90c9960e GKH |
102 | static ssize_t vmbus_show_device_attr(struct device *dev, |
103 | struct device_attribute *dev_attr, | |
98db4335 S |
104 | char *buf) |
105 | { | |
e8e27047 | 106 | struct hv_device *hv_dev = device_to_hv_device(dev); |
98db4335 | 107 | struct hv_device_info device_info; |
3e7ee490 | 108 | |
98db4335 | 109 | memset(&device_info, 0, sizeof(struct hv_device_info)); |
3e7ee490 | 110 | |
e8e27047 | 111 | get_channel_info(hv_dev, &device_info); |
3e7ee490 | 112 | |
98db4335 S |
113 | if (!strcmp(dev_attr->attr.name, "class_id")) { |
114 | return sprintf(buf, "{%02x%02x%02x%02x-%02x%02x-%02x%02x-" | |
115 | "%02x%02x%02x%02x%02x%02x%02x%02x}\n", | |
358d2ee2 S |
116 | device_info.chn_type.b[3], |
117 | device_info.chn_type.b[2], | |
118 | device_info.chn_type.b[1], | |
119 | device_info.chn_type.b[0], | |
120 | device_info.chn_type.b[5], | |
121 | device_info.chn_type.b[4], | |
122 | device_info.chn_type.b[7], | |
123 | device_info.chn_type.b[6], | |
124 | device_info.chn_type.b[8], | |
125 | device_info.chn_type.b[9], | |
126 | device_info.chn_type.b[10], | |
127 | device_info.chn_type.b[11], | |
128 | device_info.chn_type.b[12], | |
129 | device_info.chn_type.b[13], | |
130 | device_info.chn_type.b[14], | |
131 | device_info.chn_type.b[15]); | |
98db4335 S |
132 | } else if (!strcmp(dev_attr->attr.name, "device_id")) { |
133 | return sprintf(buf, "{%02x%02x%02x%02x-%02x%02x-%02x%02x-" | |
134 | "%02x%02x%02x%02x%02x%02x%02x%02x}\n", | |
358d2ee2 S |
135 | device_info.chn_instance.b[3], |
136 | device_info.chn_instance.b[2], | |
137 | device_info.chn_instance.b[1], | |
138 | device_info.chn_instance.b[0], | |
139 | device_info.chn_instance.b[5], | |
140 | device_info.chn_instance.b[4], | |
141 | device_info.chn_instance.b[7], | |
142 | device_info.chn_instance.b[6], | |
143 | device_info.chn_instance.b[8], | |
144 | device_info.chn_instance.b[9], | |
145 | device_info.chn_instance.b[10], | |
146 | device_info.chn_instance.b[11], | |
147 | device_info.chn_instance.b[12], | |
148 | device_info.chn_instance.b[13], | |
149 | device_info.chn_instance.b[14], | |
150 | device_info.chn_instance.b[15]); | |
98db4335 S |
151 | } else if (!strcmp(dev_attr->attr.name, "state")) { |
152 | return sprintf(buf, "%d\n", device_info.chn_state); | |
153 | } else if (!strcmp(dev_attr->attr.name, "id")) { | |
154 | return sprintf(buf, "%d\n", device_info.chn_id); | |
155 | } else if (!strcmp(dev_attr->attr.name, "out_intr_mask")) { | |
156 | return sprintf(buf, "%d\n", device_info.outbound.int_mask); | |
157 | } else if (!strcmp(dev_attr->attr.name, "out_read_index")) { | |
158 | return sprintf(buf, "%d\n", device_info.outbound.read_idx); | |
159 | } else if (!strcmp(dev_attr->attr.name, "out_write_index")) { | |
160 | return sprintf(buf, "%d\n", device_info.outbound.write_idx); | |
161 | } else if (!strcmp(dev_attr->attr.name, "out_read_bytes_avail")) { | |
162 | return sprintf(buf, "%d\n", | |
163 | device_info.outbound.bytes_avail_toread); | |
164 | } else if (!strcmp(dev_attr->attr.name, "out_write_bytes_avail")) { | |
165 | return sprintf(buf, "%d\n", | |
166 | device_info.outbound.bytes_avail_towrite); | |
167 | } else if (!strcmp(dev_attr->attr.name, "in_intr_mask")) { | |
168 | return sprintf(buf, "%d\n", device_info.inbound.int_mask); | |
169 | } else if (!strcmp(dev_attr->attr.name, "in_read_index")) { | |
170 | return sprintf(buf, "%d\n", device_info.inbound.read_idx); | |
171 | } else if (!strcmp(dev_attr->attr.name, "in_write_index")) { | |
172 | return sprintf(buf, "%d\n", device_info.inbound.write_idx); | |
173 | } else if (!strcmp(dev_attr->attr.name, "in_read_bytes_avail")) { | |
174 | return sprintf(buf, "%d\n", | |
175 | device_info.inbound.bytes_avail_toread); | |
176 | } else if (!strcmp(dev_attr->attr.name, "in_write_bytes_avail")) { | |
177 | return sprintf(buf, "%d\n", | |
178 | device_info.inbound.bytes_avail_towrite); | |
179 | } else if (!strcmp(dev_attr->attr.name, "monitor_id")) { | |
180 | return sprintf(buf, "%d\n", device_info.monitor_id); | |
181 | } else if (!strcmp(dev_attr->attr.name, "server_monitor_pending")) { | |
182 | return sprintf(buf, "%d\n", device_info.server_monitor_pending); | |
183 | } else if (!strcmp(dev_attr->attr.name, "server_monitor_latency")) { | |
184 | return sprintf(buf, "%d\n", device_info.server_monitor_latency); | |
185 | } else if (!strcmp(dev_attr->attr.name, "server_monitor_conn_id")) { | |
186 | return sprintf(buf, "%d\n", | |
187 | device_info.server_monitor_conn_id); | |
188 | } else if (!strcmp(dev_attr->attr.name, "client_monitor_pending")) { | |
189 | return sprintf(buf, "%d\n", device_info.client_monitor_pending); | |
190 | } else if (!strcmp(dev_attr->attr.name, "client_monitor_latency")) { | |
191 | return sprintf(buf, "%d\n", device_info.client_monitor_latency); | |
192 | } else if (!strcmp(dev_attr->attr.name, "client_monitor_conn_id")) { | |
193 | return sprintf(buf, "%d\n", | |
194 | device_info.client_monitor_conn_id); | |
195 | } else { | |
196 | return 0; | |
197 | } | |
198 | } | |
3e7ee490 | 199 | |
454f18a9 | 200 | /* Set up per device attributes in /sys/bus/vmbus/devices/<bus device> */ |
3e7ee490 HJ |
201 | static struct device_attribute vmbus_device_attrs[] = { |
202 | __ATTR(id, S_IRUGO, vmbus_show_device_attr, NULL), | |
203 | __ATTR(state, S_IRUGO, vmbus_show_device_attr, NULL), | |
204 | __ATTR(class_id, S_IRUGO, vmbus_show_device_attr, NULL), | |
205 | __ATTR(device_id, S_IRUGO, vmbus_show_device_attr, NULL), | |
206 | __ATTR(monitor_id, S_IRUGO, vmbus_show_device_attr, NULL), | |
207 | ||
208 | __ATTR(server_monitor_pending, S_IRUGO, vmbus_show_device_attr, NULL), | |
209 | __ATTR(server_monitor_latency, S_IRUGO, vmbus_show_device_attr, NULL), | |
210 | __ATTR(server_monitor_conn_id, S_IRUGO, vmbus_show_device_attr, NULL), | |
211 | ||
212 | __ATTR(client_monitor_pending, S_IRUGO, vmbus_show_device_attr, NULL), | |
213 | __ATTR(client_monitor_latency, S_IRUGO, vmbus_show_device_attr, NULL), | |
214 | __ATTR(client_monitor_conn_id, S_IRUGO, vmbus_show_device_attr, NULL), | |
215 | ||
216 | __ATTR(out_intr_mask, S_IRUGO, vmbus_show_device_attr, NULL), | |
217 | __ATTR(out_read_index, S_IRUGO, vmbus_show_device_attr, NULL), | |
218 | __ATTR(out_write_index, S_IRUGO, vmbus_show_device_attr, NULL), | |
219 | __ATTR(out_read_bytes_avail, S_IRUGO, vmbus_show_device_attr, NULL), | |
220 | __ATTR(out_write_bytes_avail, S_IRUGO, vmbus_show_device_attr, NULL), | |
221 | ||
222 | __ATTR(in_intr_mask, S_IRUGO, vmbus_show_device_attr, NULL), | |
223 | __ATTR(in_read_index, S_IRUGO, vmbus_show_device_attr, NULL), | |
224 | __ATTR(in_write_index, S_IRUGO, vmbus_show_device_attr, NULL), | |
225 | __ATTR(in_read_bytes_avail, S_IRUGO, vmbus_show_device_attr, NULL), | |
226 | __ATTR(in_write_bytes_avail, S_IRUGO, vmbus_show_device_attr, NULL), | |
227 | __ATTR_NULL | |
228 | }; | |
3e7ee490 | 229 | |
793be9c7 | 230 | |
adde2487 S |
231 | /* |
232 | * vmbus_uevent - add uevent for our device | |
233 | * | |
234 | * This routine is invoked when a device is added or removed on the vmbus to | |
235 | * generate a uevent to udev in the userspace. The udev will then look at its | |
236 | * rule and the uevent generated here to load the appropriate driver | |
0ddda660 S |
237 | * |
238 | * The alias string will be of the form vmbus:guid where guid is the string | |
239 | * representation of the device guid (each byte of the guid will be | |
240 | * represented with two hex characters. | |
adde2487 S |
241 | */ |
242 | static int vmbus_uevent(struct device *device, struct kobj_uevent_env *env) | |
243 | { | |
244 | struct hv_device *dev = device_to_hv_device(device); | |
0ddda660 S |
245 | int i, ret; |
246 | char alias_name[((sizeof((struct hv_vmbus_device_id *)0)->guid) + 1) * 2]; | |
247 | ||
248 | for (i = 0; i < ((sizeof((struct hv_vmbus_device_id *)0)->guid) * 2); i += 2) | |
249 | sprintf(&alias_name[i], "%02x", dev->dev_type.b[i/2]); | |
250 | ||
251 | ret = add_uevent_var(env, "MODALIAS=vmbus:%s", alias_name); | |
252 | return ret; | |
adde2487 S |
253 | } |
254 | ||
5841a829 S |
255 | static uuid_le null_guid; |
256 | ||
257 | static inline bool is_null_guid(const __u8 *guid) | |
258 | { | |
259 | if (memcmp(guid, &null_guid, sizeof(uuid_le))) | |
260 | return false; | |
261 | return true; | |
262 | } | |
263 | ||
b7fc147b S |
264 | |
265 | /* | |
266 | * vmbus_match - Attempt to match the specified device to the specified driver | |
267 | */ | |
268 | static int vmbus_match(struct device *device, struct device_driver *driver) | |
269 | { | |
b7fc147b | 270 | struct hv_driver *drv = drv_to_hv_drv(driver); |
e8e27047 | 271 | struct hv_device *hv_dev = device_to_hv_device(device); |
5841a829 | 272 | const struct hv_vmbus_device_id *id_array = drv->id_table; |
b7fc147b | 273 | |
5841a829 S |
274 | for (; !is_null_guid(id_array->guid); id_array++) |
275 | if (!memcmp(&id_array->guid, &hv_dev->dev_type.b, | |
e61ee14f | 276 | sizeof(uuid_le))) |
5841a829 | 277 | return 1; |
de632a2b | 278 | |
5841a829 | 279 | return 0; |
b7fc147b S |
280 | } |
281 | ||
f1f0d67b S |
282 | /* |
283 | * vmbus_probe - Add the new vmbus's child device | |
284 | */ | |
285 | static int vmbus_probe(struct device *child_device) | |
286 | { | |
287 | int ret = 0; | |
288 | struct hv_driver *drv = | |
289 | drv_to_hv_drv(child_device->driver); | |
9efd21e1 | 290 | struct hv_device *dev = device_to_hv_device(child_device); |
f1f0d67b | 291 | |
9efd21e1 S |
292 | if (drv->probe) { |
293 | ret = drv->probe(dev); | |
b14a7b30 | 294 | if (ret != 0) |
0a46618d HJ |
295 | pr_err("probe failed for device %s (%d)\n", |
296 | dev_name(child_device), ret); | |
f1f0d67b | 297 | |
f1f0d67b | 298 | } else { |
0a46618d HJ |
299 | pr_err("probe not set for driver %s\n", |
300 | dev_name(child_device)); | |
6de925b1 | 301 | ret = -ENODEV; |
f1f0d67b S |
302 | } |
303 | return ret; | |
304 | } | |
305 | ||
c5dce3db S |
306 | /* |
307 | * vmbus_remove - Remove a vmbus device | |
308 | */ | |
309 | static int vmbus_remove(struct device *child_device) | |
310 | { | |
311 | int ret; | |
312 | struct hv_driver *drv; | |
313 | ||
415b023a | 314 | struct hv_device *dev = device_to_hv_device(child_device); |
c5dce3db S |
315 | |
316 | if (child_device->driver) { | |
317 | drv = drv_to_hv_drv(child_device->driver); | |
318 | ||
415b023a S |
319 | if (drv->remove) { |
320 | ret = drv->remove(dev); | |
c5dce3db | 321 | } else { |
0a46618d HJ |
322 | pr_err("remove not set for driver %s\n", |
323 | dev_name(child_device)); | |
6de925b1 | 324 | ret = -ENODEV; |
c5dce3db S |
325 | } |
326 | } | |
327 | ||
328 | return 0; | |
329 | } | |
330 | ||
eb1bb259 S |
331 | |
332 | /* | |
333 | * vmbus_shutdown - Shutdown a vmbus device | |
334 | */ | |
335 | static void vmbus_shutdown(struct device *child_device) | |
336 | { | |
337 | struct hv_driver *drv; | |
ca6887fb | 338 | struct hv_device *dev = device_to_hv_device(child_device); |
eb1bb259 S |
339 | |
340 | ||
341 | /* The device may not be attached yet */ | |
342 | if (!child_device->driver) | |
343 | return; | |
344 | ||
345 | drv = drv_to_hv_drv(child_device->driver); | |
346 | ||
ca6887fb S |
347 | if (drv->shutdown) |
348 | drv->shutdown(dev); | |
eb1bb259 S |
349 | |
350 | return; | |
351 | } | |
352 | ||
086e7a56 S |
353 | |
354 | /* | |
355 | * vmbus_device_release - Final callback release of the vmbus child device | |
356 | */ | |
357 | static void vmbus_device_release(struct device *device) | |
358 | { | |
e8e27047 | 359 | struct hv_device *hv_dev = device_to_hv_device(device); |
086e7a56 | 360 | |
e8e27047 | 361 | kfree(hv_dev); |
086e7a56 S |
362 | |
363 | } | |
364 | ||
454f18a9 | 365 | /* The one and only one */ |
9adcac5c S |
366 | static struct bus_type hv_bus = { |
367 | .name = "vmbus", | |
368 | .match = vmbus_match, | |
369 | .shutdown = vmbus_shutdown, | |
370 | .remove = vmbus_remove, | |
371 | .probe = vmbus_probe, | |
372 | .uevent = vmbus_uevent, | |
373 | .dev_attrs = vmbus_device_attrs, | |
3e7ee490 HJ |
374 | }; |
375 | ||
adf874cb | 376 | static const char *driver_name = "hyperv"; |
36199a99 | 377 | |
36199a99 | 378 | |
bf6506f6 TT |
379 | struct onmessage_work_context { |
380 | struct work_struct work; | |
381 | struct hv_message msg; | |
382 | }; | |
383 | ||
384 | static void vmbus_onmessage_work(struct work_struct *work) | |
385 | { | |
386 | struct onmessage_work_context *ctx; | |
387 | ||
388 | ctx = container_of(work, struct onmessage_work_context, | |
389 | work); | |
390 | vmbus_onmessage(&ctx->msg); | |
391 | kfree(ctx); | |
392 | } | |
393 | ||
62c1059d | 394 | static void vmbus_on_msg_dpc(unsigned long data) |
36199a99 GKH |
395 | { |
396 | int cpu = smp_processor_id(); | |
397 | void *page_addr = hv_context.synic_message_page[cpu]; | |
398 | struct hv_message *msg = (struct hv_message *)page_addr + | |
399 | VMBUS_MESSAGE_SINT; | |
bf6506f6 | 400 | struct onmessage_work_context *ctx; |
36199a99 GKH |
401 | |
402 | while (1) { | |
403 | if (msg->header.message_type == HVMSG_NONE) { | |
404 | /* no msg */ | |
405 | break; | |
406 | } else { | |
bf6506f6 TT |
407 | ctx = kmalloc(sizeof(*ctx), GFP_ATOMIC); |
408 | if (ctx == NULL) | |
36199a99 | 409 | continue; |
bf6506f6 TT |
410 | INIT_WORK(&ctx->work, vmbus_onmessage_work); |
411 | memcpy(&ctx->msg, msg, sizeof(*msg)); | |
da9fcb72 | 412 | queue_work(vmbus_connection.work_queue, &ctx->work); |
36199a99 GKH |
413 | } |
414 | ||
415 | msg->header.message_type = HVMSG_NONE; | |
416 | ||
417 | /* | |
418 | * Make sure the write to MessageType (ie set to | |
419 | * HVMSG_NONE) happens before we read the | |
420 | * MessagePending and EOMing. Otherwise, the EOMing | |
421 | * will not deliver any more messages since there is | |
422 | * no empty slot | |
423 | */ | |
e826f1d5 | 424 | smp_mb(); |
36199a99 GKH |
425 | |
426 | if (msg->header.message_flags.msg_pending) { | |
427 | /* | |
428 | * This will cause message queue rescan to | |
429 | * possibly deliver another msg from the | |
430 | * hypervisor | |
431 | */ | |
432 | wrmsrl(HV_X64_MSR_EOM, 0); | |
433 | } | |
434 | } | |
435 | } | |
436 | ||
ae4636e6 | 437 | static irqreturn_t vmbus_isr(int irq, void *dev_id) |
36199a99 | 438 | { |
36199a99 GKH |
439 | int cpu = smp_processor_id(); |
440 | void *page_addr; | |
441 | struct hv_message *msg; | |
442 | union hv_synic_event_flags *event; | |
ae4636e6 | 443 | bool handled = false; |
36199a99 GKH |
444 | |
445 | page_addr = hv_context.synic_message_page[cpu]; | |
446 | msg = (struct hv_message *)page_addr + VMBUS_MESSAGE_SINT; | |
447 | ||
448 | /* Check if there are actual msgs to be process */ | |
ae4636e6 S |
449 | if (msg->header.message_type != HVMSG_NONE) { |
450 | handled = true; | |
451 | tasklet_schedule(&msg_dpc); | |
452 | } | |
36199a99 | 453 | |
36199a99 GKH |
454 | page_addr = hv_context.synic_event_page[cpu]; |
455 | event = (union hv_synic_event_flags *)page_addr + VMBUS_MESSAGE_SINT; | |
456 | ||
457 | /* Since we are a child, we only need to check bit 0 */ | |
ae4636e6 S |
458 | if (sync_test_and_clear_bit(0, (unsigned long *) &event->flags32[0])) { |
459 | handled = true; | |
460 | tasklet_schedule(&event_dpc); | |
461 | } | |
793be9c7 | 462 | |
ae4636e6 | 463 | if (handled) |
793be9c7 | 464 | return IRQ_HANDLED; |
ae4636e6 | 465 | else |
793be9c7 | 466 | return IRQ_NONE; |
793be9c7 S |
467 | } |
468 | ||
3e189519 | 469 | /* |
90c9960e GKH |
470 | * vmbus_bus_init -Main vmbus driver initialization routine. |
471 | * | |
472 | * Here, we | |
0686e4f4 | 473 | * - initialize the vmbus driver context |
0686e4f4 LL |
474 | * - invoke the vmbus hv main init routine |
475 | * - get the irq resource | |
0686e4f4 | 476 | * - retrieve the channel offers |
90c9960e | 477 | */ |
9aaa995e | 478 | static int vmbus_bus_init(int irq) |
3e7ee490 | 479 | { |
90c9960e GKH |
480 | int ret; |
481 | unsigned int vector; | |
3e7ee490 | 482 | |
6d26e38f GKH |
483 | /* Hypervisor initialization...setup hypercall page..etc */ |
484 | ret = hv_init(); | |
90c9960e | 485 | if (ret != 0) { |
0a46618d | 486 | pr_err("Unable to initialize the hypervisor - 0x%x\n", ret); |
d6c1c5de | 487 | return ret; |
3e7ee490 HJ |
488 | } |
489 | ||
59c0e4f0 | 490 | tasklet_init(&msg_dpc, vmbus_on_msg_dpc, 0); |
66d9229c | 491 | tasklet_init(&event_dpc, vmbus_on_event, 0); |
3e7ee490 | 492 | |
9adcac5c | 493 | ret = bus_register(&hv_bus); |
d6c1c5de S |
494 | if (ret) |
495 | return ret; | |
3e7ee490 | 496 | |
3d2de267 | 497 | ret = request_irq(irq, vmbus_isr, IRQF_SAMPLE_RANDOM, |
607c1a11 | 498 | driver_name, hv_acpi_dev); |
3e7ee490 | 499 | |
90c9960e | 500 | if (ret != 0) { |
0a46618d | 501 | pr_err("Unable to request IRQ %d\n", |
9aaa995e | 502 | irq); |
3e7ee490 | 503 | |
9adcac5c | 504 | bus_unregister(&hv_bus); |
3e7ee490 | 505 | |
d6c1c5de | 506 | return ret; |
3e7ee490 | 507 | } |
3e7ee490 | 508 | |
9aaa995e | 509 | vector = IRQ0_VECTOR + irq; |
3e7ee490 | 510 | |
800b6902 S |
511 | /* |
512 | * Notify the hypervisor of our irq and | |
513 | * connect to the host. | |
514 | */ | |
515 | on_each_cpu(hv_synic_init, (void *)&vector, 1); | |
516 | ret = vmbus_connect(); | |
90c9960e | 517 | if (ret) { |
607c1a11 | 518 | free_irq(irq, hv_acpi_dev); |
9adcac5c | 519 | bus_unregister(&hv_bus); |
d6c1c5de | 520 | return ret; |
5d48a1c2 BP |
521 | } |
522 | ||
800b6902 | 523 | |
2d6e882b | 524 | vmbus_request_offers(); |
8b5d6d3b | 525 | |
d6c1c5de | 526 | return 0; |
3e7ee490 HJ |
527 | } |
528 | ||
90c9960e | 529 | /** |
768fa219 GKH |
530 | * __vmbus_child_driver_register - Register a vmbus's driver |
531 | * @drv: Pointer to driver structure you want to register | |
532 | * @owner: owner module of the drv | |
533 | * @mod_name: module name string | |
3e189519 HJ |
534 | * |
535 | * Registers the given driver with Linux through the 'driver_register()' call | |
768fa219 | 536 | * and sets up the hyper-v vmbus handling for this driver. |
3e189519 HJ |
537 | * It will return the state of the 'driver_register()' call. |
538 | * | |
90c9960e | 539 | */ |
768fa219 | 540 | int __vmbus_driver_register(struct hv_driver *hv_driver, struct module *owner, const char *mod_name) |
3e7ee490 | 541 | { |
5d48a1c2 | 542 | int ret; |
3e7ee490 | 543 | |
768fa219 | 544 | pr_info("registering driver %s\n", hv_driver->name); |
3e7ee490 | 545 | |
768fa219 GKH |
546 | hv_driver->driver.name = hv_driver->name; |
547 | hv_driver->driver.owner = owner; | |
548 | hv_driver->driver.mod_name = mod_name; | |
549 | hv_driver->driver.bus = &hv_bus; | |
3e7ee490 | 550 | |
768fa219 | 551 | ret = driver_register(&hv_driver->driver); |
3e7ee490 | 552 | |
2d6e882b | 553 | vmbus_request_offers(); |
3e7ee490 | 554 | |
5d48a1c2 | 555 | return ret; |
3e7ee490 | 556 | } |
768fa219 | 557 | EXPORT_SYMBOL_GPL(__vmbus_driver_register); |
3e7ee490 | 558 | |
90c9960e | 559 | /** |
768fa219 GKH |
560 | * vmbus_driver_unregister() - Unregister a vmbus's driver |
561 | * @drv: Pointer to driver structure you want to un-register | |
3e189519 | 562 | * |
768fa219 GKH |
563 | * Un-register the given driver that was previous registered with a call to |
564 | * vmbus_driver_register() | |
90c9960e | 565 | */ |
768fa219 | 566 | void vmbus_driver_unregister(struct hv_driver *hv_driver) |
3e7ee490 | 567 | { |
768fa219 | 568 | pr_info("unregistering driver %s\n", hv_driver->name); |
3e7ee490 | 569 | |
768fa219 | 570 | driver_unregister(&hv_driver->driver); |
3e7ee490 | 571 | |
3e7ee490 | 572 | } |
768fa219 | 573 | EXPORT_SYMBOL_GPL(vmbus_driver_unregister); |
3e7ee490 | 574 | |
3e189519 HJ |
575 | /* |
576 | * vmbus_child_device_create - Creates and registers a new child device | |
577 | * on the vmbus. | |
90c9960e | 578 | */ |
358d2ee2 S |
579 | struct hv_device *vmbus_child_device_create(uuid_le *type, |
580 | uuid_le *instance, | |
89733aa9 | 581 | struct vmbus_channel *channel) |
3e7ee490 | 582 | { |
3d3b5518 | 583 | struct hv_device *child_device_obj; |
3e7ee490 | 584 | |
6bad88da S |
585 | child_device_obj = kzalloc(sizeof(struct hv_device), GFP_KERNEL); |
586 | if (!child_device_obj) { | |
0a46618d | 587 | pr_err("Unable to allocate device object for child device\n"); |
3e7ee490 HJ |
588 | return NULL; |
589 | } | |
590 | ||
cae5b843 | 591 | child_device_obj->channel = channel; |
358d2ee2 | 592 | memcpy(&child_device_obj->dev_type, type, sizeof(uuid_le)); |
ca623ad3 | 593 | memcpy(&child_device_obj->dev_instance, instance, |
358d2ee2 | 594 | sizeof(uuid_le)); |
3e7ee490 | 595 | |
3e7ee490 | 596 | |
3e7ee490 HJ |
597 | return child_device_obj; |
598 | } | |
599 | ||
3e189519 | 600 | /* |
e13a0b5a | 601 | * vmbus_child_device_register - Register the child device |
90c9960e | 602 | */ |
3ca07cb0 | 603 | int vmbus_child_device_register(struct hv_device *child_device_obj) |
3e7ee490 | 604 | { |
90c9960e | 605 | int ret = 0; |
6bad88da | 606 | |
f4888417 | 607 | static atomic_t device_num = ATOMIC_INIT(0); |
3e7ee490 | 608 | |
6bad88da | 609 | dev_set_name(&child_device_obj->device, "vmbus_0_%d", |
90c9960e | 610 | atomic_inc_return(&device_num)); |
3e7ee490 | 611 | |
0bce28b6 | 612 | child_device_obj->device.bus = &hv_bus; |
607c1a11 | 613 | child_device_obj->device.parent = &hv_acpi_dev->dev; |
6bad88da | 614 | child_device_obj->device.release = vmbus_device_release; |
3e7ee490 | 615 | |
90c9960e GKH |
616 | /* |
617 | * Register with the LDM. This will kick off the driver/device | |
618 | * binding...which will eventually call vmbus_match() and vmbus_probe() | |
619 | */ | |
6bad88da | 620 | ret = device_register(&child_device_obj->device); |
3e7ee490 | 621 | |
3e7ee490 | 622 | if (ret) |
0a46618d | 623 | pr_err("Unable to register child device\n"); |
3e7ee490 | 624 | else |
0a46618d HJ |
625 | pr_info("child device %s registered\n", |
626 | dev_name(&child_device_obj->device)); | |
3e7ee490 | 627 | |
3e7ee490 HJ |
628 | return ret; |
629 | } | |
630 | ||
3e189519 HJ |
631 | /* |
632 | * vmbus_child_device_unregister - Remove the specified child device | |
633 | * from the vmbus. | |
90c9960e | 634 | */ |
9d8bd71a | 635 | void vmbus_child_device_unregister(struct hv_device *device_obj) |
3e7ee490 | 636 | { |
90c9960e GKH |
637 | /* |
638 | * Kick off the process of unregistering the device. | |
639 | * This will call vmbus_remove() and eventually vmbus_device_release() | |
640 | */ | |
6bad88da | 641 | device_unregister(&device_obj->device); |
3e7ee490 | 642 | |
0a46618d HJ |
643 | pr_info("child device %s unregistered\n", |
644 | dev_name(&device_obj->device)); | |
3e7ee490 HJ |
645 | } |
646 | ||
3e7ee490 | 647 | |
b0069f43 S |
648 | /* |
649 | * VMBUS is an acpi enumerated device. Get the the IRQ information | |
650 | * from DSDT. | |
651 | */ | |
652 | ||
653 | static acpi_status vmbus_walk_resources(struct acpi_resource *res, void *irq) | |
654 | { | |
655 | ||
656 | if (res->type == ACPI_RESOURCE_TYPE_IRQ) { | |
657 | struct acpi_resource_irq *irqp; | |
658 | irqp = &res->data.irq; | |
659 | ||
660 | *((unsigned int *)irq) = irqp->interrupts[0]; | |
661 | } | |
662 | ||
663 | return AE_OK; | |
664 | } | |
665 | ||
666 | static int vmbus_acpi_add(struct acpi_device *device) | |
667 | { | |
668 | acpi_status result; | |
669 | ||
607c1a11 S |
670 | hv_acpi_dev = device; |
671 | ||
0a4425b6 S |
672 | result = acpi_walk_resources(device->handle, METHOD_NAME__CRS, |
673 | vmbus_walk_resources, &irq); | |
b0069f43 S |
674 | |
675 | if (ACPI_FAILURE(result)) { | |
676 | complete(&probe_event); | |
677 | return -ENODEV; | |
678 | } | |
679 | complete(&probe_event); | |
680 | return 0; | |
681 | } | |
682 | ||
683 | static const struct acpi_device_id vmbus_acpi_device_ids[] = { | |
684 | {"VMBUS", 0}, | |
9d7b18d1 | 685 | {"VMBus", 0}, |
b0069f43 S |
686 | {"", 0}, |
687 | }; | |
688 | MODULE_DEVICE_TABLE(acpi, vmbus_acpi_device_ids); | |
689 | ||
690 | static struct acpi_driver vmbus_acpi_driver = { | |
691 | .name = "vmbus", | |
692 | .ids = vmbus_acpi_device_ids, | |
693 | .ops = { | |
694 | .add = vmbus_acpi_add, | |
695 | }, | |
696 | }; | |
697 | ||
607c1a11 | 698 | static int __init hv_acpi_init(void) |
1168ac22 | 699 | { |
2dda95f8 | 700 | int ret, t; |
b0069f43 S |
701 | |
702 | init_completion(&probe_event); | |
703 | ||
704 | /* | |
705 | * Get irq resources first. | |
706 | */ | |
707 | ||
0246604c S |
708 | ret = acpi_bus_register_driver(&vmbus_acpi_driver); |
709 | ||
b0069f43 S |
710 | if (ret) |
711 | return ret; | |
712 | ||
2dda95f8 S |
713 | t = wait_for_completion_timeout(&probe_event, 5*HZ); |
714 | if (t == 0) { | |
715 | ret = -ETIMEDOUT; | |
716 | goto cleanup; | |
717 | } | |
b0069f43 S |
718 | |
719 | if (irq <= 0) { | |
2dda95f8 S |
720 | ret = -ENODEV; |
721 | goto cleanup; | |
b0069f43 S |
722 | } |
723 | ||
91fd799e S |
724 | ret = vmbus_bus_init(irq); |
725 | if (ret) | |
2dda95f8 S |
726 | goto cleanup; |
727 | ||
728 | return 0; | |
729 | ||
730 | cleanup: | |
731 | acpi_bus_unregister_driver(&vmbus_acpi_driver); | |
91fd799e | 732 | return ret; |
1168ac22 S |
733 | } |
734 | ||
1168ac22 | 735 | |
90c9960e | 736 | MODULE_LICENSE("GPL"); |
26c14cc1 | 737 | MODULE_VERSION(HV_DRV_VERSION); |
13399cba | 738 | module_param(vmbus_loglevel, int, S_IRUGO|S_IWUSR); |
3e7ee490 | 739 | |
607c1a11 | 740 | module_init(hv_acpi_init); |