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> | |
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 | ||
36199a99 GKH |
394 | /* |
395 | * vmbus_on_msg_dpc - DPC routine to handle messages from the hypervisior | |
396 | */ | |
62c1059d | 397 | static void vmbus_on_msg_dpc(unsigned long data) |
36199a99 GKH |
398 | { |
399 | int cpu = smp_processor_id(); | |
400 | void *page_addr = hv_context.synic_message_page[cpu]; | |
401 | struct hv_message *msg = (struct hv_message *)page_addr + | |
402 | VMBUS_MESSAGE_SINT; | |
bf6506f6 | 403 | struct onmessage_work_context *ctx; |
36199a99 GKH |
404 | |
405 | while (1) { | |
406 | if (msg->header.message_type == HVMSG_NONE) { | |
407 | /* no msg */ | |
408 | break; | |
409 | } else { | |
bf6506f6 TT |
410 | ctx = kmalloc(sizeof(*ctx), GFP_ATOMIC); |
411 | if (ctx == NULL) | |
36199a99 | 412 | continue; |
bf6506f6 TT |
413 | INIT_WORK(&ctx->work, vmbus_onmessage_work); |
414 | memcpy(&ctx->msg, msg, sizeof(*msg)); | |
da9fcb72 | 415 | queue_work(vmbus_connection.work_queue, &ctx->work); |
36199a99 GKH |
416 | } |
417 | ||
418 | msg->header.message_type = HVMSG_NONE; | |
419 | ||
420 | /* | |
421 | * Make sure the write to MessageType (ie set to | |
422 | * HVMSG_NONE) happens before we read the | |
423 | * MessagePending and EOMing. Otherwise, the EOMing | |
424 | * will not deliver any more messages since there is | |
425 | * no empty slot | |
426 | */ | |
e826f1d5 | 427 | smp_mb(); |
36199a99 GKH |
428 | |
429 | if (msg->header.message_flags.msg_pending) { | |
430 | /* | |
431 | * This will cause message queue rescan to | |
432 | * possibly deliver another msg from the | |
433 | * hypervisor | |
434 | */ | |
435 | wrmsrl(HV_X64_MSR_EOM, 0); | |
436 | } | |
437 | } | |
438 | } | |
439 | ||
36199a99 GKH |
440 | /* |
441 | * vmbus_on_isr - ISR routine | |
442 | */ | |
480ae58d | 443 | static int vmbus_on_isr(void) |
36199a99 GKH |
444 | { |
445 | int ret = 0; | |
446 | int cpu = smp_processor_id(); | |
447 | void *page_addr; | |
448 | struct hv_message *msg; | |
449 | union hv_synic_event_flags *event; | |
450 | ||
451 | page_addr = hv_context.synic_message_page[cpu]; | |
452 | msg = (struct hv_message *)page_addr + VMBUS_MESSAGE_SINT; | |
453 | ||
454 | /* Check if there are actual msgs to be process */ | |
98e08702 | 455 | if (msg->header.message_type != HVMSG_NONE) |
36199a99 | 456 | ret |= 0x1; |
36199a99 | 457 | |
36199a99 GKH |
458 | page_addr = hv_context.synic_event_page[cpu]; |
459 | event = (union hv_synic_event_flags *)page_addr + VMBUS_MESSAGE_SINT; | |
460 | ||
461 | /* Since we are a child, we only need to check bit 0 */ | |
32235b07 | 462 | if (sync_test_and_clear_bit(0, (unsigned long *) &event->flags32[0])) |
36199a99 | 463 | ret |= 0x2; |
36199a99 GKH |
464 | |
465 | return ret; | |
466 | } | |
467 | ||
793be9c7 S |
468 | |
469 | static irqreturn_t vmbus_isr(int irq, void *dev_id) | |
470 | { | |
471 | int ret; | |
472 | ||
473 | ret = vmbus_on_isr(); | |
474 | ||
475 | /* Schedules a dpc if necessary */ | |
476 | if (ret > 0) { | |
477 | if (test_bit(0, (unsigned long *)&ret)) | |
59c0e4f0 | 478 | tasklet_schedule(&msg_dpc); |
793be9c7 S |
479 | |
480 | if (test_bit(1, (unsigned long *)&ret)) | |
66d9229c | 481 | tasklet_schedule(&event_dpc); |
793be9c7 S |
482 | |
483 | return IRQ_HANDLED; | |
484 | } else { | |
485 | return IRQ_NONE; | |
486 | } | |
487 | } | |
488 | ||
3e189519 | 489 | /* |
90c9960e GKH |
490 | * vmbus_bus_init -Main vmbus driver initialization routine. |
491 | * | |
492 | * Here, we | |
0686e4f4 | 493 | * - initialize the vmbus driver context |
0686e4f4 LL |
494 | * - invoke the vmbus hv main init routine |
495 | * - get the irq resource | |
0686e4f4 | 496 | * - retrieve the channel offers |
90c9960e | 497 | */ |
9aaa995e | 498 | static int vmbus_bus_init(int irq) |
3e7ee490 | 499 | { |
90c9960e GKH |
500 | int ret; |
501 | unsigned int vector; | |
3e7ee490 | 502 | |
6d26e38f GKH |
503 | /* Hypervisor initialization...setup hypercall page..etc */ |
504 | ret = hv_init(); | |
90c9960e | 505 | if (ret != 0) { |
0a46618d | 506 | pr_err("Unable to initialize the hypervisor - 0x%x\n", ret); |
d6c1c5de | 507 | return ret; |
3e7ee490 HJ |
508 | } |
509 | ||
454f18a9 | 510 | /* Initialize the bus context */ |
59c0e4f0 | 511 | tasklet_init(&msg_dpc, vmbus_on_msg_dpc, 0); |
66d9229c | 512 | tasklet_init(&event_dpc, vmbus_on_event, 0); |
3e7ee490 | 513 | |
a6e4d8e3 | 514 | /* Now, register the bus with LDM */ |
9adcac5c | 515 | ret = bus_register(&hv_bus); |
d6c1c5de S |
516 | if (ret) |
517 | return ret; | |
3e7ee490 | 518 | |
454f18a9 | 519 | /* Get the interrupt resource */ |
3d2de267 | 520 | ret = request_irq(irq, vmbus_isr, IRQF_SAMPLE_RANDOM, |
607c1a11 | 521 | driver_name, hv_acpi_dev); |
3e7ee490 | 522 | |
90c9960e | 523 | if (ret != 0) { |
0a46618d | 524 | pr_err("Unable to request IRQ %d\n", |
9aaa995e | 525 | irq); |
3e7ee490 | 526 | |
9adcac5c | 527 | bus_unregister(&hv_bus); |
3e7ee490 | 528 | |
d6c1c5de | 529 | return ret; |
3e7ee490 | 530 | } |
3e7ee490 | 531 | |
9aaa995e | 532 | vector = IRQ0_VECTOR + irq; |
3e7ee490 | 533 | |
800b6902 S |
534 | /* |
535 | * Notify the hypervisor of our irq and | |
536 | * connect to the host. | |
537 | */ | |
538 | on_each_cpu(hv_synic_init, (void *)&vector, 1); | |
539 | ret = vmbus_connect(); | |
90c9960e | 540 | if (ret) { |
607c1a11 | 541 | free_irq(irq, hv_acpi_dev); |
9adcac5c | 542 | bus_unregister(&hv_bus); |
d6c1c5de | 543 | return ret; |
5d48a1c2 BP |
544 | } |
545 | ||
800b6902 | 546 | |
2d6e882b | 547 | vmbus_request_offers(); |
8b5d6d3b | 548 | |
d6c1c5de | 549 | return 0; |
3e7ee490 HJ |
550 | } |
551 | ||
90c9960e | 552 | /** |
768fa219 GKH |
553 | * __vmbus_child_driver_register - Register a vmbus's driver |
554 | * @drv: Pointer to driver structure you want to register | |
555 | * @owner: owner module of the drv | |
556 | * @mod_name: module name string | |
3e189519 HJ |
557 | * |
558 | * Registers the given driver with Linux through the 'driver_register()' call | |
768fa219 | 559 | * and sets up the hyper-v vmbus handling for this driver. |
3e189519 HJ |
560 | * It will return the state of the 'driver_register()' call. |
561 | * | |
90c9960e | 562 | */ |
768fa219 | 563 | int __vmbus_driver_register(struct hv_driver *hv_driver, struct module *owner, const char *mod_name) |
3e7ee490 | 564 | { |
5d48a1c2 | 565 | int ret; |
3e7ee490 | 566 | |
768fa219 | 567 | pr_info("registering driver %s\n", hv_driver->name); |
3e7ee490 | 568 | |
768fa219 GKH |
569 | hv_driver->driver.name = hv_driver->name; |
570 | hv_driver->driver.owner = owner; | |
571 | hv_driver->driver.mod_name = mod_name; | |
572 | hv_driver->driver.bus = &hv_bus; | |
3e7ee490 | 573 | |
768fa219 | 574 | ret = driver_register(&hv_driver->driver); |
3e7ee490 | 575 | |
2d6e882b | 576 | vmbus_request_offers(); |
3e7ee490 | 577 | |
5d48a1c2 | 578 | return ret; |
3e7ee490 | 579 | } |
768fa219 | 580 | EXPORT_SYMBOL_GPL(__vmbus_driver_register); |
3e7ee490 | 581 | |
90c9960e | 582 | /** |
768fa219 GKH |
583 | * vmbus_driver_unregister() - Unregister a vmbus's driver |
584 | * @drv: Pointer to driver structure you want to un-register | |
3e189519 | 585 | * |
768fa219 GKH |
586 | * Un-register the given driver that was previous registered with a call to |
587 | * vmbus_driver_register() | |
90c9960e | 588 | */ |
768fa219 | 589 | void vmbus_driver_unregister(struct hv_driver *hv_driver) |
3e7ee490 | 590 | { |
768fa219 | 591 | pr_info("unregistering driver %s\n", hv_driver->name); |
3e7ee490 | 592 | |
768fa219 | 593 | driver_unregister(&hv_driver->driver); |
3e7ee490 | 594 | |
3e7ee490 | 595 | } |
768fa219 | 596 | EXPORT_SYMBOL_GPL(vmbus_driver_unregister); |
3e7ee490 | 597 | |
3e189519 HJ |
598 | /* |
599 | * vmbus_child_device_create - Creates and registers a new child device | |
600 | * on the vmbus. | |
90c9960e | 601 | */ |
358d2ee2 S |
602 | struct hv_device *vmbus_child_device_create(uuid_le *type, |
603 | uuid_le *instance, | |
89733aa9 | 604 | struct vmbus_channel *channel) |
3e7ee490 | 605 | { |
3d3b5518 | 606 | struct hv_device *child_device_obj; |
3e7ee490 | 607 | |
454f18a9 | 608 | /* Allocate the new child device */ |
6bad88da S |
609 | child_device_obj = kzalloc(sizeof(struct hv_device), GFP_KERNEL); |
610 | if (!child_device_obj) { | |
0a46618d | 611 | pr_err("Unable to allocate device object for child device\n"); |
3e7ee490 HJ |
612 | return NULL; |
613 | } | |
614 | ||
cae5b843 | 615 | child_device_obj->channel = channel; |
358d2ee2 | 616 | memcpy(&child_device_obj->dev_type, type, sizeof(uuid_le)); |
ca623ad3 | 617 | memcpy(&child_device_obj->dev_instance, instance, |
358d2ee2 | 618 | sizeof(uuid_le)); |
3e7ee490 | 619 | |
3e7ee490 | 620 | |
3e7ee490 HJ |
621 | return child_device_obj; |
622 | } | |
623 | ||
3e189519 | 624 | /* |
e13a0b5a | 625 | * vmbus_child_device_register - Register the child device |
90c9960e | 626 | */ |
3ca07cb0 | 627 | int vmbus_child_device_register(struct hv_device *child_device_obj) |
3e7ee490 | 628 | { |
90c9960e | 629 | int ret = 0; |
6bad88da | 630 | |
f4888417 | 631 | static atomic_t device_num = ATOMIC_INIT(0); |
3e7ee490 | 632 | |
1bb40a25 | 633 | /* Set the device name. Otherwise, device_register() will fail. */ |
6bad88da | 634 | dev_set_name(&child_device_obj->device, "vmbus_0_%d", |
90c9960e | 635 | atomic_inc_return(&device_num)); |
3e7ee490 | 636 | |
454f18a9 | 637 | /* The new device belongs to this bus */ |
9adcac5c | 638 | child_device_obj->device.bus = &hv_bus; /* device->dev.bus; */ |
607c1a11 | 639 | child_device_obj->device.parent = &hv_acpi_dev->dev; |
6bad88da | 640 | child_device_obj->device.release = vmbus_device_release; |
3e7ee490 | 641 | |
90c9960e GKH |
642 | /* |
643 | * Register with the LDM. This will kick off the driver/device | |
644 | * binding...which will eventually call vmbus_match() and vmbus_probe() | |
645 | */ | |
6bad88da | 646 | ret = device_register(&child_device_obj->device); |
3e7ee490 | 647 | |
3e7ee490 | 648 | if (ret) |
0a46618d | 649 | pr_err("Unable to register child device\n"); |
3e7ee490 | 650 | else |
0a46618d HJ |
651 | pr_info("child device %s registered\n", |
652 | dev_name(&child_device_obj->device)); | |
3e7ee490 | 653 | |
3e7ee490 HJ |
654 | return ret; |
655 | } | |
656 | ||
3e189519 HJ |
657 | /* |
658 | * vmbus_child_device_unregister - Remove the specified child device | |
659 | * from the vmbus. | |
90c9960e | 660 | */ |
9d8bd71a | 661 | void vmbus_child_device_unregister(struct hv_device *device_obj) |
3e7ee490 | 662 | { |
90c9960e GKH |
663 | /* |
664 | * Kick off the process of unregistering the device. | |
665 | * This will call vmbus_remove() and eventually vmbus_device_release() | |
666 | */ | |
6bad88da | 667 | device_unregister(&device_obj->device); |
3e7ee490 | 668 | |
0a46618d HJ |
669 | pr_info("child device %s unregistered\n", |
670 | dev_name(&device_obj->device)); | |
3e7ee490 HJ |
671 | } |
672 | ||
3e7ee490 | 673 | |
b0069f43 S |
674 | /* |
675 | * VMBUS is an acpi enumerated device. Get the the IRQ information | |
676 | * from DSDT. | |
677 | */ | |
678 | ||
679 | static acpi_status vmbus_walk_resources(struct acpi_resource *res, void *irq) | |
680 | { | |
681 | ||
682 | if (res->type == ACPI_RESOURCE_TYPE_IRQ) { | |
683 | struct acpi_resource_irq *irqp; | |
684 | irqp = &res->data.irq; | |
685 | ||
686 | *((unsigned int *)irq) = irqp->interrupts[0]; | |
687 | } | |
688 | ||
689 | return AE_OK; | |
690 | } | |
691 | ||
692 | static int vmbus_acpi_add(struct acpi_device *device) | |
693 | { | |
694 | acpi_status result; | |
695 | ||
607c1a11 S |
696 | hv_acpi_dev = device; |
697 | ||
b0069f43 S |
698 | result = |
699 | acpi_walk_resources(device->handle, METHOD_NAME__CRS, | |
700 | vmbus_walk_resources, &irq); | |
701 | ||
702 | if (ACPI_FAILURE(result)) { | |
703 | complete(&probe_event); | |
704 | return -ENODEV; | |
705 | } | |
706 | complete(&probe_event); | |
707 | return 0; | |
708 | } | |
709 | ||
710 | static const struct acpi_device_id vmbus_acpi_device_ids[] = { | |
711 | {"VMBUS", 0}, | |
9d7b18d1 | 712 | {"VMBus", 0}, |
b0069f43 S |
713 | {"", 0}, |
714 | }; | |
715 | MODULE_DEVICE_TABLE(acpi, vmbus_acpi_device_ids); | |
716 | ||
717 | static struct acpi_driver vmbus_acpi_driver = { | |
718 | .name = "vmbus", | |
719 | .ids = vmbus_acpi_device_ids, | |
720 | .ops = { | |
721 | .add = vmbus_acpi_add, | |
722 | }, | |
723 | }; | |
724 | ||
607c1a11 | 725 | static int __init hv_acpi_init(void) |
1168ac22 | 726 | { |
2dda95f8 | 727 | int ret, t; |
b0069f43 S |
728 | |
729 | init_completion(&probe_event); | |
730 | ||
731 | /* | |
732 | * Get irq resources first. | |
733 | */ | |
734 | ||
0246604c S |
735 | ret = acpi_bus_register_driver(&vmbus_acpi_driver); |
736 | ||
b0069f43 S |
737 | if (ret) |
738 | return ret; | |
739 | ||
2dda95f8 S |
740 | t = wait_for_completion_timeout(&probe_event, 5*HZ); |
741 | if (t == 0) { | |
742 | ret = -ETIMEDOUT; | |
743 | goto cleanup; | |
744 | } | |
b0069f43 S |
745 | |
746 | if (irq <= 0) { | |
2dda95f8 S |
747 | ret = -ENODEV; |
748 | goto cleanup; | |
b0069f43 S |
749 | } |
750 | ||
91fd799e S |
751 | ret = vmbus_bus_init(irq); |
752 | if (ret) | |
2dda95f8 S |
753 | goto cleanup; |
754 | ||
755 | return 0; | |
756 | ||
757 | cleanup: | |
758 | acpi_bus_unregister_driver(&vmbus_acpi_driver); | |
91fd799e | 759 | return ret; |
1168ac22 S |
760 | } |
761 | ||
1168ac22 | 762 | |
90c9960e | 763 | MODULE_LICENSE("GPL"); |
26c14cc1 | 764 | MODULE_VERSION(HV_DRV_VERSION); |
13399cba | 765 | module_param(vmbus_loglevel, int, S_IRUGO|S_IWUSR); |
3e7ee490 | 766 | |
607c1a11 | 767 | module_init(hv_acpi_init); |