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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> |
46a97191 | 35 | #include <linux/hyperv.h> |
3f335ea2 | 36 | |
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 | |
fd776ba9 OH |
96 | #define VMBUS_ALIAS_LEN ((sizeof((struct hv_vmbus_device_id *)0)->guid) * 2) |
97 | static void print_alias_name(struct hv_device *hv_dev, char *alias_name) | |
98 | { | |
99 | int i; | |
100 | for (i = 0; i < VMBUS_ALIAS_LEN; i += 2) | |
101 | sprintf(&alias_name[i], "%02x", hv_dev->dev_type.b[i/2]); | |
102 | } | |
103 | ||
98db4335 S |
104 | /* |
105 | * vmbus_show_device_attr - Show the device attribute in sysfs. | |
106 | * | |
107 | * This is invoked when user does a | |
108 | * "cat /sys/bus/vmbus/devices/<busdevice>/<attr name>" | |
109 | */ | |
90c9960e GKH |
110 | static ssize_t vmbus_show_device_attr(struct device *dev, |
111 | struct device_attribute *dev_attr, | |
98db4335 S |
112 | char *buf) |
113 | { | |
e8e27047 | 114 | struct hv_device *hv_dev = device_to_hv_device(dev); |
7bb52384 | 115 | struct hv_device_info *device_info; |
fd776ba9 | 116 | char alias_name[VMBUS_ALIAS_LEN + 1]; |
7bb52384 | 117 | int ret = 0; |
3e7ee490 | 118 | |
7bb52384 S |
119 | device_info = kzalloc(sizeof(struct hv_device_info), GFP_KERNEL); |
120 | if (!device_info) | |
121 | return ret; | |
3e7ee490 | 122 | |
7bb52384 | 123 | get_channel_info(hv_dev, device_info); |
3e7ee490 | 124 | |
98db4335 | 125 | if (!strcmp(dev_attr->attr.name, "class_id")) { |
7bb52384 | 126 | ret = sprintf(buf, "{%02x%02x%02x%02x-%02x%02x-%02x%02x-" |
98db4335 | 127 | "%02x%02x%02x%02x%02x%02x%02x%02x}\n", |
7bb52384 S |
128 | device_info->chn_type.b[3], |
129 | device_info->chn_type.b[2], | |
130 | device_info->chn_type.b[1], | |
131 | device_info->chn_type.b[0], | |
132 | device_info->chn_type.b[5], | |
133 | device_info->chn_type.b[4], | |
134 | device_info->chn_type.b[7], | |
135 | device_info->chn_type.b[6], | |
136 | device_info->chn_type.b[8], | |
137 | device_info->chn_type.b[9], | |
138 | device_info->chn_type.b[10], | |
139 | device_info->chn_type.b[11], | |
140 | device_info->chn_type.b[12], | |
141 | device_info->chn_type.b[13], | |
142 | device_info->chn_type.b[14], | |
143 | device_info->chn_type.b[15]); | |
98db4335 | 144 | } else if (!strcmp(dev_attr->attr.name, "device_id")) { |
7bb52384 | 145 | ret = sprintf(buf, "{%02x%02x%02x%02x-%02x%02x-%02x%02x-" |
98db4335 | 146 | "%02x%02x%02x%02x%02x%02x%02x%02x}\n", |
7bb52384 S |
147 | device_info->chn_instance.b[3], |
148 | device_info->chn_instance.b[2], | |
149 | device_info->chn_instance.b[1], | |
150 | device_info->chn_instance.b[0], | |
151 | device_info->chn_instance.b[5], | |
152 | device_info->chn_instance.b[4], | |
153 | device_info->chn_instance.b[7], | |
154 | device_info->chn_instance.b[6], | |
155 | device_info->chn_instance.b[8], | |
156 | device_info->chn_instance.b[9], | |
157 | device_info->chn_instance.b[10], | |
158 | device_info->chn_instance.b[11], | |
159 | device_info->chn_instance.b[12], | |
160 | device_info->chn_instance.b[13], | |
161 | device_info->chn_instance.b[14], | |
162 | device_info->chn_instance.b[15]); | |
fd776ba9 OH |
163 | } else if (!strcmp(dev_attr->attr.name, "modalias")) { |
164 | print_alias_name(hv_dev, alias_name); | |
7bb52384 | 165 | ret = sprintf(buf, "vmbus:%s\n", alias_name); |
98db4335 | 166 | } else if (!strcmp(dev_attr->attr.name, "state")) { |
7bb52384 | 167 | ret = sprintf(buf, "%d\n", device_info->chn_state); |
98db4335 | 168 | } else if (!strcmp(dev_attr->attr.name, "id")) { |
7bb52384 | 169 | ret = sprintf(buf, "%d\n", device_info->chn_id); |
98db4335 | 170 | } else if (!strcmp(dev_attr->attr.name, "out_intr_mask")) { |
7bb52384 | 171 | ret = sprintf(buf, "%d\n", device_info->outbound.int_mask); |
98db4335 | 172 | } else if (!strcmp(dev_attr->attr.name, "out_read_index")) { |
7bb52384 | 173 | ret = sprintf(buf, "%d\n", device_info->outbound.read_idx); |
98db4335 | 174 | } else if (!strcmp(dev_attr->attr.name, "out_write_index")) { |
7bb52384 | 175 | ret = sprintf(buf, "%d\n", device_info->outbound.write_idx); |
98db4335 | 176 | } else if (!strcmp(dev_attr->attr.name, "out_read_bytes_avail")) { |
7bb52384 S |
177 | ret = sprintf(buf, "%d\n", |
178 | device_info->outbound.bytes_avail_toread); | |
98db4335 | 179 | } else if (!strcmp(dev_attr->attr.name, "out_write_bytes_avail")) { |
7bb52384 S |
180 | ret = sprintf(buf, "%d\n", |
181 | device_info->outbound.bytes_avail_towrite); | |
98db4335 | 182 | } else if (!strcmp(dev_attr->attr.name, "in_intr_mask")) { |
7bb52384 | 183 | ret = sprintf(buf, "%d\n", device_info->inbound.int_mask); |
98db4335 | 184 | } else if (!strcmp(dev_attr->attr.name, "in_read_index")) { |
7bb52384 | 185 | ret = sprintf(buf, "%d\n", device_info->inbound.read_idx); |
98db4335 | 186 | } else if (!strcmp(dev_attr->attr.name, "in_write_index")) { |
7bb52384 | 187 | ret = sprintf(buf, "%d\n", device_info->inbound.write_idx); |
98db4335 | 188 | } else if (!strcmp(dev_attr->attr.name, "in_read_bytes_avail")) { |
7bb52384 S |
189 | ret = sprintf(buf, "%d\n", |
190 | device_info->inbound.bytes_avail_toread); | |
98db4335 | 191 | } else if (!strcmp(dev_attr->attr.name, "in_write_bytes_avail")) { |
7bb52384 S |
192 | ret = sprintf(buf, "%d\n", |
193 | device_info->inbound.bytes_avail_towrite); | |
98db4335 | 194 | } else if (!strcmp(dev_attr->attr.name, "monitor_id")) { |
7bb52384 | 195 | ret = sprintf(buf, "%d\n", device_info->monitor_id); |
98db4335 | 196 | } else if (!strcmp(dev_attr->attr.name, "server_monitor_pending")) { |
7bb52384 | 197 | ret = sprintf(buf, "%d\n", device_info->server_monitor_pending); |
98db4335 | 198 | } else if (!strcmp(dev_attr->attr.name, "server_monitor_latency")) { |
7bb52384 | 199 | ret = sprintf(buf, "%d\n", device_info->server_monitor_latency); |
98db4335 | 200 | } else if (!strcmp(dev_attr->attr.name, "server_monitor_conn_id")) { |
7bb52384 S |
201 | ret = sprintf(buf, "%d\n", |
202 | device_info->server_monitor_conn_id); | |
98db4335 | 203 | } else if (!strcmp(dev_attr->attr.name, "client_monitor_pending")) { |
7bb52384 | 204 | ret = sprintf(buf, "%d\n", device_info->client_monitor_pending); |
98db4335 | 205 | } else if (!strcmp(dev_attr->attr.name, "client_monitor_latency")) { |
7bb52384 | 206 | ret = sprintf(buf, "%d\n", device_info->client_monitor_latency); |
98db4335 | 207 | } else if (!strcmp(dev_attr->attr.name, "client_monitor_conn_id")) { |
7bb52384 S |
208 | ret = sprintf(buf, "%d\n", |
209 | device_info->client_monitor_conn_id); | |
98db4335 | 210 | } |
7bb52384 S |
211 | |
212 | kfree(device_info); | |
213 | return ret; | |
98db4335 | 214 | } |
3e7ee490 | 215 | |
454f18a9 | 216 | /* Set up per device attributes in /sys/bus/vmbus/devices/<bus device> */ |
3e7ee490 HJ |
217 | static struct device_attribute vmbus_device_attrs[] = { |
218 | __ATTR(id, S_IRUGO, vmbus_show_device_attr, NULL), | |
219 | __ATTR(state, S_IRUGO, vmbus_show_device_attr, NULL), | |
220 | __ATTR(class_id, S_IRUGO, vmbus_show_device_attr, NULL), | |
221 | __ATTR(device_id, S_IRUGO, vmbus_show_device_attr, NULL), | |
222 | __ATTR(monitor_id, S_IRUGO, vmbus_show_device_attr, NULL), | |
fd776ba9 | 223 | __ATTR(modalias, S_IRUGO, vmbus_show_device_attr, NULL), |
3e7ee490 HJ |
224 | |
225 | __ATTR(server_monitor_pending, S_IRUGO, vmbus_show_device_attr, NULL), | |
226 | __ATTR(server_monitor_latency, S_IRUGO, vmbus_show_device_attr, NULL), | |
227 | __ATTR(server_monitor_conn_id, S_IRUGO, vmbus_show_device_attr, NULL), | |
228 | ||
229 | __ATTR(client_monitor_pending, S_IRUGO, vmbus_show_device_attr, NULL), | |
230 | __ATTR(client_monitor_latency, S_IRUGO, vmbus_show_device_attr, NULL), | |
231 | __ATTR(client_monitor_conn_id, S_IRUGO, vmbus_show_device_attr, NULL), | |
232 | ||
233 | __ATTR(out_intr_mask, S_IRUGO, vmbus_show_device_attr, NULL), | |
234 | __ATTR(out_read_index, S_IRUGO, vmbus_show_device_attr, NULL), | |
235 | __ATTR(out_write_index, S_IRUGO, vmbus_show_device_attr, NULL), | |
236 | __ATTR(out_read_bytes_avail, S_IRUGO, vmbus_show_device_attr, NULL), | |
237 | __ATTR(out_write_bytes_avail, S_IRUGO, vmbus_show_device_attr, NULL), | |
238 | ||
239 | __ATTR(in_intr_mask, S_IRUGO, vmbus_show_device_attr, NULL), | |
240 | __ATTR(in_read_index, S_IRUGO, vmbus_show_device_attr, NULL), | |
241 | __ATTR(in_write_index, S_IRUGO, vmbus_show_device_attr, NULL), | |
242 | __ATTR(in_read_bytes_avail, S_IRUGO, vmbus_show_device_attr, NULL), | |
243 | __ATTR(in_write_bytes_avail, S_IRUGO, vmbus_show_device_attr, NULL), | |
244 | __ATTR_NULL | |
245 | }; | |
3e7ee490 | 246 | |
793be9c7 | 247 | |
adde2487 S |
248 | /* |
249 | * vmbus_uevent - add uevent for our device | |
250 | * | |
251 | * This routine is invoked when a device is added or removed on the vmbus to | |
252 | * generate a uevent to udev in the userspace. The udev will then look at its | |
253 | * rule and the uevent generated here to load the appropriate driver | |
0ddda660 S |
254 | * |
255 | * The alias string will be of the form vmbus:guid where guid is the string | |
256 | * representation of the device guid (each byte of the guid will be | |
257 | * represented with two hex characters. | |
adde2487 S |
258 | */ |
259 | static int vmbus_uevent(struct device *device, struct kobj_uevent_env *env) | |
260 | { | |
261 | struct hv_device *dev = device_to_hv_device(device); | |
fd776ba9 OH |
262 | int ret; |
263 | char alias_name[VMBUS_ALIAS_LEN + 1]; | |
0ddda660 | 264 | |
fd776ba9 | 265 | print_alias_name(dev, alias_name); |
0ddda660 S |
266 | ret = add_uevent_var(env, "MODALIAS=vmbus:%s", alias_name); |
267 | return ret; | |
adde2487 S |
268 | } |
269 | ||
5841a829 S |
270 | static uuid_le null_guid; |
271 | ||
272 | static inline bool is_null_guid(const __u8 *guid) | |
273 | { | |
274 | if (memcmp(guid, &null_guid, sizeof(uuid_le))) | |
275 | return false; | |
276 | return true; | |
277 | } | |
278 | ||
3037a7b6 S |
279 | /* |
280 | * Return a matching hv_vmbus_device_id pointer. | |
281 | * If there is no match, return NULL. | |
282 | */ | |
283 | static const struct hv_vmbus_device_id *hv_vmbus_get_id( | |
284 | const struct hv_vmbus_device_id *id, | |
285 | __u8 *guid) | |
286 | { | |
287 | for (; !is_null_guid(id->guid); id++) | |
288 | if (!memcmp(&id->guid, guid, sizeof(uuid_le))) | |
289 | return id; | |
290 | ||
291 | return NULL; | |
292 | } | |
293 | ||
294 | ||
b7fc147b S |
295 | |
296 | /* | |
297 | * vmbus_match - Attempt to match the specified device to the specified driver | |
298 | */ | |
299 | static int vmbus_match(struct device *device, struct device_driver *driver) | |
300 | { | |
b7fc147b | 301 | struct hv_driver *drv = drv_to_hv_drv(driver); |
e8e27047 | 302 | struct hv_device *hv_dev = device_to_hv_device(device); |
b7fc147b | 303 | |
3037a7b6 S |
304 | if (hv_vmbus_get_id(drv->id_table, hv_dev->dev_type.b)) |
305 | return 1; | |
de632a2b | 306 | |
5841a829 | 307 | return 0; |
b7fc147b S |
308 | } |
309 | ||
f1f0d67b S |
310 | /* |
311 | * vmbus_probe - Add the new vmbus's child device | |
312 | */ | |
313 | static int vmbus_probe(struct device *child_device) | |
314 | { | |
315 | int ret = 0; | |
316 | struct hv_driver *drv = | |
317 | drv_to_hv_drv(child_device->driver); | |
9efd21e1 | 318 | struct hv_device *dev = device_to_hv_device(child_device); |
84946899 | 319 | const struct hv_vmbus_device_id *dev_id; |
f1f0d67b | 320 | |
84946899 | 321 | dev_id = hv_vmbus_get_id(drv->id_table, dev->dev_type.b); |
9efd21e1 | 322 | if (drv->probe) { |
84946899 | 323 | ret = drv->probe(dev, dev_id); |
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 | { | |
d4372179 | 341 | struct hv_driver *drv = drv_to_hv_drv(child_device->driver); |
415b023a | 342 | struct hv_device *dev = device_to_hv_device(child_device); |
c5dce3db | 343 | |
d4372179 S |
344 | if (drv->remove) |
345 | drv->remove(dev); | |
346 | else | |
347 | pr_err("remove not set for driver %s\n", | |
348 | dev_name(child_device)); | |
c5dce3db S |
349 | |
350 | return 0; | |
351 | } | |
352 | ||
eb1bb259 S |
353 | |
354 | /* | |
355 | * vmbus_shutdown - Shutdown a vmbus device | |
356 | */ | |
357 | static void vmbus_shutdown(struct device *child_device) | |
358 | { | |
359 | struct hv_driver *drv; | |
ca6887fb | 360 | struct hv_device *dev = device_to_hv_device(child_device); |
eb1bb259 S |
361 | |
362 | ||
363 | /* The device may not be attached yet */ | |
364 | if (!child_device->driver) | |
365 | return; | |
366 | ||
367 | drv = drv_to_hv_drv(child_device->driver); | |
368 | ||
ca6887fb S |
369 | if (drv->shutdown) |
370 | drv->shutdown(dev); | |
eb1bb259 S |
371 | |
372 | return; | |
373 | } | |
374 | ||
086e7a56 S |
375 | |
376 | /* | |
377 | * vmbus_device_release - Final callback release of the vmbus child device | |
378 | */ | |
379 | static void vmbus_device_release(struct device *device) | |
380 | { | |
e8e27047 | 381 | struct hv_device *hv_dev = device_to_hv_device(device); |
086e7a56 | 382 | |
e8e27047 | 383 | kfree(hv_dev); |
086e7a56 S |
384 | |
385 | } | |
386 | ||
454f18a9 | 387 | /* The one and only one */ |
9adcac5c S |
388 | static struct bus_type hv_bus = { |
389 | .name = "vmbus", | |
390 | .match = vmbus_match, | |
391 | .shutdown = vmbus_shutdown, | |
392 | .remove = vmbus_remove, | |
393 | .probe = vmbus_probe, | |
394 | .uevent = vmbus_uevent, | |
395 | .dev_attrs = vmbus_device_attrs, | |
3e7ee490 HJ |
396 | }; |
397 | ||
adf874cb | 398 | static const char *driver_name = "hyperv"; |
36199a99 | 399 | |
36199a99 | 400 | |
bf6506f6 TT |
401 | struct onmessage_work_context { |
402 | struct work_struct work; | |
403 | struct hv_message msg; | |
404 | }; | |
405 | ||
406 | static void vmbus_onmessage_work(struct work_struct *work) | |
407 | { | |
408 | struct onmessage_work_context *ctx; | |
409 | ||
410 | ctx = container_of(work, struct onmessage_work_context, | |
411 | work); | |
412 | vmbus_onmessage(&ctx->msg); | |
413 | kfree(ctx); | |
414 | } | |
415 | ||
62c1059d | 416 | static void vmbus_on_msg_dpc(unsigned long data) |
36199a99 GKH |
417 | { |
418 | int cpu = smp_processor_id(); | |
419 | void *page_addr = hv_context.synic_message_page[cpu]; | |
420 | struct hv_message *msg = (struct hv_message *)page_addr + | |
421 | VMBUS_MESSAGE_SINT; | |
bf6506f6 | 422 | struct onmessage_work_context *ctx; |
36199a99 GKH |
423 | |
424 | while (1) { | |
425 | if (msg->header.message_type == HVMSG_NONE) { | |
426 | /* no msg */ | |
427 | break; | |
428 | } else { | |
bf6506f6 TT |
429 | ctx = kmalloc(sizeof(*ctx), GFP_ATOMIC); |
430 | if (ctx == NULL) | |
36199a99 | 431 | continue; |
bf6506f6 TT |
432 | INIT_WORK(&ctx->work, vmbus_onmessage_work); |
433 | memcpy(&ctx->msg, msg, sizeof(*msg)); | |
da9fcb72 | 434 | queue_work(vmbus_connection.work_queue, &ctx->work); |
36199a99 GKH |
435 | } |
436 | ||
437 | msg->header.message_type = HVMSG_NONE; | |
438 | ||
439 | /* | |
440 | * Make sure the write to MessageType (ie set to | |
441 | * HVMSG_NONE) happens before we read the | |
442 | * MessagePending and EOMing. Otherwise, the EOMing | |
443 | * will not deliver any more messages since there is | |
444 | * no empty slot | |
445 | */ | |
e826f1d5 | 446 | smp_mb(); |
36199a99 GKH |
447 | |
448 | if (msg->header.message_flags.msg_pending) { | |
449 | /* | |
450 | * This will cause message queue rescan to | |
451 | * possibly deliver another msg from the | |
452 | * hypervisor | |
453 | */ | |
454 | wrmsrl(HV_X64_MSR_EOM, 0); | |
455 | } | |
456 | } | |
457 | } | |
458 | ||
ae4636e6 | 459 | static irqreturn_t vmbus_isr(int irq, void *dev_id) |
36199a99 | 460 | { |
36199a99 GKH |
461 | int cpu = smp_processor_id(); |
462 | void *page_addr; | |
463 | struct hv_message *msg; | |
464 | union hv_synic_event_flags *event; | |
ae4636e6 | 465 | bool handled = false; |
36199a99 | 466 | |
7341d908 S |
467 | /* |
468 | * Check for events before checking for messages. This is the order | |
469 | * in which events and messages are checked in Windows guests on | |
470 | * Hyper-V, and the Windows team suggested we do the same. | |
471 | */ | |
36199a99 | 472 | |
36199a99 GKH |
473 | page_addr = hv_context.synic_event_page[cpu]; |
474 | event = (union hv_synic_event_flags *)page_addr + VMBUS_MESSAGE_SINT; | |
475 | ||
476 | /* Since we are a child, we only need to check bit 0 */ | |
ae4636e6 S |
477 | if (sync_test_and_clear_bit(0, (unsigned long *) &event->flags32[0])) { |
478 | handled = true; | |
479 | tasklet_schedule(&event_dpc); | |
480 | } | |
793be9c7 | 481 | |
7341d908 S |
482 | page_addr = hv_context.synic_message_page[cpu]; |
483 | msg = (struct hv_message *)page_addr + VMBUS_MESSAGE_SINT; | |
484 | ||
485 | /* Check if there are actual msgs to be processed */ | |
486 | if (msg->header.message_type != HVMSG_NONE) { | |
487 | handled = true; | |
488 | tasklet_schedule(&msg_dpc); | |
489 | } | |
490 | ||
ae4636e6 | 491 | if (handled) |
793be9c7 | 492 | return IRQ_HANDLED; |
ae4636e6 | 493 | else |
793be9c7 | 494 | return IRQ_NONE; |
793be9c7 S |
495 | } |
496 | ||
3e189519 | 497 | /* |
90c9960e GKH |
498 | * vmbus_bus_init -Main vmbus driver initialization routine. |
499 | * | |
500 | * Here, we | |
0686e4f4 | 501 | * - initialize the vmbus driver context |
0686e4f4 LL |
502 | * - invoke the vmbus hv main init routine |
503 | * - get the irq resource | |
0686e4f4 | 504 | * - retrieve the channel offers |
90c9960e | 505 | */ |
9aaa995e | 506 | static int vmbus_bus_init(int irq) |
3e7ee490 | 507 | { |
90c9960e GKH |
508 | int ret; |
509 | unsigned int vector; | |
3e7ee490 | 510 | |
6d26e38f GKH |
511 | /* Hypervisor initialization...setup hypercall page..etc */ |
512 | ret = hv_init(); | |
90c9960e | 513 | if (ret != 0) { |
0a46618d | 514 | pr_err("Unable to initialize the hypervisor - 0x%x\n", ret); |
d6c1c5de | 515 | return ret; |
3e7ee490 HJ |
516 | } |
517 | ||
59c0e4f0 | 518 | tasklet_init(&msg_dpc, vmbus_on_msg_dpc, 0); |
66d9229c | 519 | tasklet_init(&event_dpc, vmbus_on_event, 0); |
3e7ee490 | 520 | |
9adcac5c | 521 | ret = bus_register(&hv_bus); |
d6c1c5de | 522 | if (ret) |
8b9987e9 | 523 | goto err_cleanup; |
3e7ee490 | 524 | |
3d2de267 | 525 | ret = request_irq(irq, vmbus_isr, IRQF_SAMPLE_RANDOM, |
607c1a11 | 526 | driver_name, hv_acpi_dev); |
3e7ee490 | 527 | |
90c9960e | 528 | if (ret != 0) { |
0a46618d | 529 | pr_err("Unable to request IRQ %d\n", |
9aaa995e | 530 | irq); |
8b9987e9 | 531 | goto err_unregister; |
3e7ee490 | 532 | } |
3e7ee490 | 533 | |
9aaa995e | 534 | vector = IRQ0_VECTOR + irq; |
3e7ee490 | 535 | |
800b6902 S |
536 | /* |
537 | * Notify the hypervisor of our irq and | |
538 | * connect to the host. | |
539 | */ | |
540 | on_each_cpu(hv_synic_init, (void *)&vector, 1); | |
541 | ret = vmbus_connect(); | |
8b9987e9 S |
542 | if (ret) |
543 | goto err_irq; | |
800b6902 | 544 | |
2d6e882b | 545 | vmbus_request_offers(); |
8b5d6d3b | 546 | |
d6c1c5de | 547 | return 0; |
8b9987e9 S |
548 | |
549 | err_irq: | |
550 | free_irq(irq, hv_acpi_dev); | |
551 | ||
552 | err_unregister: | |
553 | bus_unregister(&hv_bus); | |
554 | ||
555 | err_cleanup: | |
556 | hv_cleanup(); | |
557 | ||
558 | return ret; | |
3e7ee490 HJ |
559 | } |
560 | ||
90c9960e | 561 | /** |
768fa219 GKH |
562 | * __vmbus_child_driver_register - Register a vmbus's driver |
563 | * @drv: Pointer to driver structure you want to register | |
564 | * @owner: owner module of the drv | |
565 | * @mod_name: module name string | |
3e189519 HJ |
566 | * |
567 | * Registers the given driver with Linux through the 'driver_register()' call | |
768fa219 | 568 | * and sets up the hyper-v vmbus handling for this driver. |
3e189519 HJ |
569 | * It will return the state of the 'driver_register()' call. |
570 | * | |
90c9960e | 571 | */ |
768fa219 | 572 | int __vmbus_driver_register(struct hv_driver *hv_driver, struct module *owner, const char *mod_name) |
3e7ee490 | 573 | { |
5d48a1c2 | 574 | int ret; |
3e7ee490 | 575 | |
768fa219 | 576 | pr_info("registering driver %s\n", hv_driver->name); |
3e7ee490 | 577 | |
768fa219 GKH |
578 | hv_driver->driver.name = hv_driver->name; |
579 | hv_driver->driver.owner = owner; | |
580 | hv_driver->driver.mod_name = mod_name; | |
581 | hv_driver->driver.bus = &hv_bus; | |
3e7ee490 | 582 | |
768fa219 | 583 | ret = driver_register(&hv_driver->driver); |
3e7ee490 | 584 | |
2d6e882b | 585 | vmbus_request_offers(); |
3e7ee490 | 586 | |
5d48a1c2 | 587 | return ret; |
3e7ee490 | 588 | } |
768fa219 | 589 | EXPORT_SYMBOL_GPL(__vmbus_driver_register); |
3e7ee490 | 590 | |
90c9960e | 591 | /** |
768fa219 GKH |
592 | * vmbus_driver_unregister() - Unregister a vmbus's driver |
593 | * @drv: Pointer to driver structure you want to un-register | |
3e189519 | 594 | * |
768fa219 GKH |
595 | * Un-register the given driver that was previous registered with a call to |
596 | * vmbus_driver_register() | |
90c9960e | 597 | */ |
768fa219 | 598 | void vmbus_driver_unregister(struct hv_driver *hv_driver) |
3e7ee490 | 599 | { |
768fa219 | 600 | pr_info("unregistering driver %s\n", hv_driver->name); |
3e7ee490 | 601 | |
768fa219 | 602 | driver_unregister(&hv_driver->driver); |
3e7ee490 | 603 | |
3e7ee490 | 604 | } |
768fa219 | 605 | EXPORT_SYMBOL_GPL(vmbus_driver_unregister); |
3e7ee490 | 606 | |
3e189519 | 607 | /* |
f2c73011 | 608 | * vmbus_device_create - Creates and registers a new child device |
3e189519 | 609 | * on the vmbus. |
90c9960e | 610 | */ |
f2c73011 | 611 | struct hv_device *vmbus_device_create(uuid_le *type, |
358d2ee2 | 612 | uuid_le *instance, |
89733aa9 | 613 | struct vmbus_channel *channel) |
3e7ee490 | 614 | { |
3d3b5518 | 615 | struct hv_device *child_device_obj; |
3e7ee490 | 616 | |
6bad88da S |
617 | child_device_obj = kzalloc(sizeof(struct hv_device), GFP_KERNEL); |
618 | if (!child_device_obj) { | |
0a46618d | 619 | pr_err("Unable to allocate device object for child device\n"); |
3e7ee490 HJ |
620 | return NULL; |
621 | } | |
622 | ||
cae5b843 | 623 | child_device_obj->channel = channel; |
358d2ee2 | 624 | memcpy(&child_device_obj->dev_type, type, sizeof(uuid_le)); |
ca623ad3 | 625 | memcpy(&child_device_obj->dev_instance, instance, |
358d2ee2 | 626 | sizeof(uuid_le)); |
3e7ee490 | 627 | |
3e7ee490 | 628 | |
3e7ee490 HJ |
629 | return child_device_obj; |
630 | } | |
631 | ||
3e189519 | 632 | /* |
22794281 | 633 | * vmbus_device_register - Register the child device |
90c9960e | 634 | */ |
22794281 | 635 | int vmbus_device_register(struct hv_device *child_device_obj) |
3e7ee490 | 636 | { |
90c9960e | 637 | int ret = 0; |
6bad88da | 638 | |
f4888417 | 639 | static atomic_t device_num = ATOMIC_INIT(0); |
3e7ee490 | 640 | |
6bad88da | 641 | dev_set_name(&child_device_obj->device, "vmbus_0_%d", |
90c9960e | 642 | atomic_inc_return(&device_num)); |
3e7ee490 | 643 | |
0bce28b6 | 644 | child_device_obj->device.bus = &hv_bus; |
607c1a11 | 645 | child_device_obj->device.parent = &hv_acpi_dev->dev; |
6bad88da | 646 | child_device_obj->device.release = vmbus_device_release; |
3e7ee490 | 647 | |
90c9960e GKH |
648 | /* |
649 | * Register with the LDM. This will kick off the driver/device | |
650 | * binding...which will eventually call vmbus_match() and vmbus_probe() | |
651 | */ | |
6bad88da | 652 | ret = device_register(&child_device_obj->device); |
3e7ee490 | 653 | |
3e7ee490 | 654 | if (ret) |
0a46618d | 655 | pr_err("Unable to register child device\n"); |
3e7ee490 | 656 | else |
0a46618d HJ |
657 | pr_info("child device %s registered\n", |
658 | dev_name(&child_device_obj->device)); | |
3e7ee490 | 659 | |
3e7ee490 HJ |
660 | return ret; |
661 | } | |
662 | ||
3e189519 | 663 | /* |
696453ba | 664 | * vmbus_device_unregister - Remove the specified child device |
3e189519 | 665 | * from the vmbus. |
90c9960e | 666 | */ |
696453ba | 667 | void vmbus_device_unregister(struct hv_device *device_obj) |
3e7ee490 | 668 | { |
90c9960e GKH |
669 | /* |
670 | * Kick off the process of unregistering the device. | |
671 | * This will call vmbus_remove() and eventually vmbus_device_release() | |
672 | */ | |
6bad88da | 673 | device_unregister(&device_obj->device); |
3e7ee490 | 674 | |
0a46618d HJ |
675 | pr_info("child device %s unregistered\n", |
676 | dev_name(&device_obj->device)); | |
3e7ee490 HJ |
677 | } |
678 | ||
3e7ee490 | 679 | |
b0069f43 S |
680 | /* |
681 | * VMBUS is an acpi enumerated device. Get the the IRQ information | |
682 | * from DSDT. | |
683 | */ | |
684 | ||
685 | static acpi_status vmbus_walk_resources(struct acpi_resource *res, void *irq) | |
686 | { | |
687 | ||
688 | if (res->type == ACPI_RESOURCE_TYPE_IRQ) { | |
689 | struct acpi_resource_irq *irqp; | |
690 | irqp = &res->data.irq; | |
691 | ||
692 | *((unsigned int *)irq) = irqp->interrupts[0]; | |
693 | } | |
694 | ||
695 | return AE_OK; | |
696 | } | |
697 | ||
698 | static int vmbus_acpi_add(struct acpi_device *device) | |
699 | { | |
700 | acpi_status result; | |
701 | ||
607c1a11 S |
702 | hv_acpi_dev = device; |
703 | ||
0a4425b6 S |
704 | result = acpi_walk_resources(device->handle, METHOD_NAME__CRS, |
705 | vmbus_walk_resources, &irq); | |
b0069f43 S |
706 | |
707 | if (ACPI_FAILURE(result)) { | |
708 | complete(&probe_event); | |
709 | return -ENODEV; | |
710 | } | |
711 | complete(&probe_event); | |
712 | return 0; | |
713 | } | |
714 | ||
715 | static const struct acpi_device_id vmbus_acpi_device_ids[] = { | |
716 | {"VMBUS", 0}, | |
9d7b18d1 | 717 | {"VMBus", 0}, |
b0069f43 S |
718 | {"", 0}, |
719 | }; | |
720 | MODULE_DEVICE_TABLE(acpi, vmbus_acpi_device_ids); | |
721 | ||
722 | static struct acpi_driver vmbus_acpi_driver = { | |
723 | .name = "vmbus", | |
724 | .ids = vmbus_acpi_device_ids, | |
725 | .ops = { | |
726 | .add = vmbus_acpi_add, | |
727 | }, | |
728 | }; | |
729 | ||
607c1a11 | 730 | static int __init hv_acpi_init(void) |
1168ac22 | 731 | { |
2dda95f8 | 732 | int ret, t; |
b0069f43 S |
733 | |
734 | init_completion(&probe_event); | |
735 | ||
736 | /* | |
737 | * Get irq resources first. | |
738 | */ | |
739 | ||
0246604c S |
740 | ret = acpi_bus_register_driver(&vmbus_acpi_driver); |
741 | ||
b0069f43 S |
742 | if (ret) |
743 | return ret; | |
744 | ||
2dda95f8 S |
745 | t = wait_for_completion_timeout(&probe_event, 5*HZ); |
746 | if (t == 0) { | |
747 | ret = -ETIMEDOUT; | |
748 | goto cleanup; | |
749 | } | |
b0069f43 S |
750 | |
751 | if (irq <= 0) { | |
2dda95f8 S |
752 | ret = -ENODEV; |
753 | goto cleanup; | |
b0069f43 S |
754 | } |
755 | ||
91fd799e S |
756 | ret = vmbus_bus_init(irq); |
757 | if (ret) | |
2dda95f8 S |
758 | goto cleanup; |
759 | ||
760 | return 0; | |
761 | ||
762 | cleanup: | |
763 | acpi_bus_unregister_driver(&vmbus_acpi_driver); | |
91fd799e | 764 | return ret; |
1168ac22 S |
765 | } |
766 | ||
1168ac22 | 767 | |
90c9960e | 768 | MODULE_LICENSE("GPL"); |
26c14cc1 | 769 | MODULE_VERSION(HV_DRV_VERSION); |
13399cba | 770 | module_param(vmbus_loglevel, int, S_IRUGO|S_IWUSR); |
3e7ee490 | 771 | |
607c1a11 | 772 | module_init(hv_acpi_init); |