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> |
46a97191 | 35 | #include <linux/hyperv.h> |
407dd164 | 36 | #include <asm/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; |
71a6655d | 44 | static struct completion probe_event; |
b0069f43 | 45 | static int irq; |
98db4335 | 46 | |
15b80d64 GKH |
47 | struct hv_device_info { |
48 | u32 chn_id; | |
49 | u32 chn_state; | |
50 | uuid_le chn_type; | |
51 | uuid_le chn_instance; | |
52 | ||
53 | u32 monitor_id; | |
54 | u32 server_monitor_pending; | |
55 | u32 server_monitor_latency; | |
56 | u32 server_monitor_conn_id; | |
57 | u32 client_monitor_pending; | |
58 | u32 client_monitor_latency; | |
59 | u32 client_monitor_conn_id; | |
60 | ||
61 | struct hv_dev_port_info inbound; | |
62 | struct hv_dev_port_info outbound; | |
63 | }; | |
64 | ||
cf6a2eac S |
65 | static int vmbus_exists(void) |
66 | { | |
67 | if (hv_acpi_dev == NULL) | |
68 | return -ENODEV; | |
69 | ||
70 | return 0; | |
71 | } | |
72 | ||
15b80d64 | 73 | |
98db4335 S |
74 | static void get_channel_info(struct hv_device *device, |
75 | struct hv_device_info *info) | |
76 | { | |
77 | struct vmbus_channel_debug_info debug_info; | |
78 | ||
79 | if (!device->channel) | |
80 | return; | |
81 | ||
82 | vmbus_get_debug_info(device->channel, &debug_info); | |
83 | ||
84 | info->chn_id = debug_info.relid; | |
85 | info->chn_state = debug_info.state; | |
86 | memcpy(&info->chn_type, &debug_info.interfacetype, | |
358d2ee2 | 87 | sizeof(uuid_le)); |
98db4335 | 88 | memcpy(&info->chn_instance, &debug_info.interface_instance, |
358d2ee2 | 89 | sizeof(uuid_le)); |
98db4335 S |
90 | |
91 | info->monitor_id = debug_info.monitorid; | |
92 | ||
93 | info->server_monitor_pending = debug_info.servermonitor_pending; | |
94 | info->server_monitor_latency = debug_info.servermonitor_latency; | |
95 | info->server_monitor_conn_id = debug_info.servermonitor_connectionid; | |
96 | ||
97 | info->client_monitor_pending = debug_info.clientmonitor_pending; | |
98 | info->client_monitor_latency = debug_info.clientmonitor_latency; | |
99 | info->client_monitor_conn_id = debug_info.clientmonitor_connectionid; | |
100 | ||
101 | info->inbound.int_mask = debug_info.inbound.current_interrupt_mask; | |
102 | info->inbound.read_idx = debug_info.inbound.current_read_index; | |
103 | info->inbound.write_idx = debug_info.inbound.current_write_index; | |
104 | info->inbound.bytes_avail_toread = | |
105 | debug_info.inbound.bytes_avail_toread; | |
106 | info->inbound.bytes_avail_towrite = | |
107 | debug_info.inbound.bytes_avail_towrite; | |
3e7ee490 | 108 | |
98db4335 S |
109 | info->outbound.int_mask = |
110 | debug_info.outbound.current_interrupt_mask; | |
111 | info->outbound.read_idx = debug_info.outbound.current_read_index; | |
112 | info->outbound.write_idx = debug_info.outbound.current_write_index; | |
113 | info->outbound.bytes_avail_toread = | |
114 | debug_info.outbound.bytes_avail_toread; | |
115 | info->outbound.bytes_avail_towrite = | |
116 | debug_info.outbound.bytes_avail_towrite; | |
117 | } | |
3e7ee490 | 118 | |
fd776ba9 OH |
119 | #define VMBUS_ALIAS_LEN ((sizeof((struct hv_vmbus_device_id *)0)->guid) * 2) |
120 | static void print_alias_name(struct hv_device *hv_dev, char *alias_name) | |
121 | { | |
122 | int i; | |
123 | for (i = 0; i < VMBUS_ALIAS_LEN; i += 2) | |
124 | sprintf(&alias_name[i], "%02x", hv_dev->dev_type.b[i/2]); | |
125 | } | |
126 | ||
98db4335 S |
127 | /* |
128 | * vmbus_show_device_attr - Show the device attribute in sysfs. | |
129 | * | |
130 | * This is invoked when user does a | |
131 | * "cat /sys/bus/vmbus/devices/<busdevice>/<attr name>" | |
132 | */ | |
90c9960e GKH |
133 | static ssize_t vmbus_show_device_attr(struct device *dev, |
134 | struct device_attribute *dev_attr, | |
98db4335 S |
135 | char *buf) |
136 | { | |
e8e27047 | 137 | struct hv_device *hv_dev = device_to_hv_device(dev); |
7bb52384 | 138 | struct hv_device_info *device_info; |
fd776ba9 | 139 | char alias_name[VMBUS_ALIAS_LEN + 1]; |
7bb52384 | 140 | int ret = 0; |
3e7ee490 | 141 | |
7bb52384 S |
142 | device_info = kzalloc(sizeof(struct hv_device_info), GFP_KERNEL); |
143 | if (!device_info) | |
144 | return ret; | |
3e7ee490 | 145 | |
7bb52384 | 146 | get_channel_info(hv_dev, device_info); |
3e7ee490 | 147 | |
98db4335 | 148 | if (!strcmp(dev_attr->attr.name, "class_id")) { |
7bb52384 | 149 | ret = sprintf(buf, "{%02x%02x%02x%02x-%02x%02x-%02x%02x-" |
98db4335 | 150 | "%02x%02x%02x%02x%02x%02x%02x%02x}\n", |
7bb52384 S |
151 | device_info->chn_type.b[3], |
152 | device_info->chn_type.b[2], | |
153 | device_info->chn_type.b[1], | |
154 | device_info->chn_type.b[0], | |
155 | device_info->chn_type.b[5], | |
156 | device_info->chn_type.b[4], | |
157 | device_info->chn_type.b[7], | |
158 | device_info->chn_type.b[6], | |
159 | device_info->chn_type.b[8], | |
160 | device_info->chn_type.b[9], | |
161 | device_info->chn_type.b[10], | |
162 | device_info->chn_type.b[11], | |
163 | device_info->chn_type.b[12], | |
164 | device_info->chn_type.b[13], | |
165 | device_info->chn_type.b[14], | |
166 | device_info->chn_type.b[15]); | |
98db4335 | 167 | } else if (!strcmp(dev_attr->attr.name, "device_id")) { |
7bb52384 | 168 | ret = sprintf(buf, "{%02x%02x%02x%02x-%02x%02x-%02x%02x-" |
98db4335 | 169 | "%02x%02x%02x%02x%02x%02x%02x%02x}\n", |
7bb52384 S |
170 | device_info->chn_instance.b[3], |
171 | device_info->chn_instance.b[2], | |
172 | device_info->chn_instance.b[1], | |
173 | device_info->chn_instance.b[0], | |
174 | device_info->chn_instance.b[5], | |
175 | device_info->chn_instance.b[4], | |
176 | device_info->chn_instance.b[7], | |
177 | device_info->chn_instance.b[6], | |
178 | device_info->chn_instance.b[8], | |
179 | device_info->chn_instance.b[9], | |
180 | device_info->chn_instance.b[10], | |
181 | device_info->chn_instance.b[11], | |
182 | device_info->chn_instance.b[12], | |
183 | device_info->chn_instance.b[13], | |
184 | device_info->chn_instance.b[14], | |
185 | device_info->chn_instance.b[15]); | |
fd776ba9 OH |
186 | } else if (!strcmp(dev_attr->attr.name, "modalias")) { |
187 | print_alias_name(hv_dev, alias_name); | |
7bb52384 | 188 | ret = sprintf(buf, "vmbus:%s\n", alias_name); |
98db4335 | 189 | } else if (!strcmp(dev_attr->attr.name, "state")) { |
7bb52384 | 190 | ret = sprintf(buf, "%d\n", device_info->chn_state); |
98db4335 | 191 | } else if (!strcmp(dev_attr->attr.name, "id")) { |
7bb52384 | 192 | ret = sprintf(buf, "%d\n", device_info->chn_id); |
98db4335 | 193 | } else if (!strcmp(dev_attr->attr.name, "out_intr_mask")) { |
7bb52384 | 194 | ret = sprintf(buf, "%d\n", device_info->outbound.int_mask); |
98db4335 | 195 | } else if (!strcmp(dev_attr->attr.name, "out_read_index")) { |
7bb52384 | 196 | ret = sprintf(buf, "%d\n", device_info->outbound.read_idx); |
98db4335 | 197 | } else if (!strcmp(dev_attr->attr.name, "out_write_index")) { |
7bb52384 | 198 | ret = sprintf(buf, "%d\n", device_info->outbound.write_idx); |
98db4335 | 199 | } else if (!strcmp(dev_attr->attr.name, "out_read_bytes_avail")) { |
7bb52384 S |
200 | ret = sprintf(buf, "%d\n", |
201 | device_info->outbound.bytes_avail_toread); | |
98db4335 | 202 | } else if (!strcmp(dev_attr->attr.name, "out_write_bytes_avail")) { |
7bb52384 S |
203 | ret = sprintf(buf, "%d\n", |
204 | device_info->outbound.bytes_avail_towrite); | |
98db4335 | 205 | } else if (!strcmp(dev_attr->attr.name, "in_intr_mask")) { |
7bb52384 | 206 | ret = sprintf(buf, "%d\n", device_info->inbound.int_mask); |
98db4335 | 207 | } else if (!strcmp(dev_attr->attr.name, "in_read_index")) { |
7bb52384 | 208 | ret = sprintf(buf, "%d\n", device_info->inbound.read_idx); |
98db4335 | 209 | } else if (!strcmp(dev_attr->attr.name, "in_write_index")) { |
7bb52384 | 210 | ret = sprintf(buf, "%d\n", device_info->inbound.write_idx); |
98db4335 | 211 | } else if (!strcmp(dev_attr->attr.name, "in_read_bytes_avail")) { |
7bb52384 S |
212 | ret = sprintf(buf, "%d\n", |
213 | device_info->inbound.bytes_avail_toread); | |
98db4335 | 214 | } else if (!strcmp(dev_attr->attr.name, "in_write_bytes_avail")) { |
7bb52384 S |
215 | ret = sprintf(buf, "%d\n", |
216 | device_info->inbound.bytes_avail_towrite); | |
98db4335 | 217 | } else if (!strcmp(dev_attr->attr.name, "monitor_id")) { |
7bb52384 | 218 | ret = sprintf(buf, "%d\n", device_info->monitor_id); |
98db4335 | 219 | } else if (!strcmp(dev_attr->attr.name, "server_monitor_pending")) { |
7bb52384 | 220 | ret = sprintf(buf, "%d\n", device_info->server_monitor_pending); |
98db4335 | 221 | } else if (!strcmp(dev_attr->attr.name, "server_monitor_latency")) { |
7bb52384 | 222 | ret = sprintf(buf, "%d\n", device_info->server_monitor_latency); |
98db4335 | 223 | } else if (!strcmp(dev_attr->attr.name, "server_monitor_conn_id")) { |
7bb52384 S |
224 | ret = sprintf(buf, "%d\n", |
225 | device_info->server_monitor_conn_id); | |
98db4335 | 226 | } else if (!strcmp(dev_attr->attr.name, "client_monitor_pending")) { |
7bb52384 | 227 | ret = sprintf(buf, "%d\n", device_info->client_monitor_pending); |
98db4335 | 228 | } else if (!strcmp(dev_attr->attr.name, "client_monitor_latency")) { |
7bb52384 | 229 | ret = sprintf(buf, "%d\n", device_info->client_monitor_latency); |
98db4335 | 230 | } else if (!strcmp(dev_attr->attr.name, "client_monitor_conn_id")) { |
7bb52384 S |
231 | ret = sprintf(buf, "%d\n", |
232 | device_info->client_monitor_conn_id); | |
98db4335 | 233 | } |
7bb52384 S |
234 | |
235 | kfree(device_info); | |
236 | return ret; | |
98db4335 | 237 | } |
3e7ee490 | 238 | |
454f18a9 | 239 | /* Set up per device attributes in /sys/bus/vmbus/devices/<bus device> */ |
3e7ee490 HJ |
240 | static struct device_attribute vmbus_device_attrs[] = { |
241 | __ATTR(id, S_IRUGO, vmbus_show_device_attr, NULL), | |
242 | __ATTR(state, S_IRUGO, vmbus_show_device_attr, NULL), | |
243 | __ATTR(class_id, S_IRUGO, vmbus_show_device_attr, NULL), | |
244 | __ATTR(device_id, S_IRUGO, vmbus_show_device_attr, NULL), | |
245 | __ATTR(monitor_id, S_IRUGO, vmbus_show_device_attr, NULL), | |
fd776ba9 | 246 | __ATTR(modalias, S_IRUGO, vmbus_show_device_attr, NULL), |
3e7ee490 HJ |
247 | |
248 | __ATTR(server_monitor_pending, S_IRUGO, vmbus_show_device_attr, NULL), | |
249 | __ATTR(server_monitor_latency, S_IRUGO, vmbus_show_device_attr, NULL), | |
250 | __ATTR(server_monitor_conn_id, S_IRUGO, vmbus_show_device_attr, NULL), | |
251 | ||
252 | __ATTR(client_monitor_pending, S_IRUGO, vmbus_show_device_attr, NULL), | |
253 | __ATTR(client_monitor_latency, S_IRUGO, vmbus_show_device_attr, NULL), | |
254 | __ATTR(client_monitor_conn_id, S_IRUGO, vmbus_show_device_attr, NULL), | |
255 | ||
256 | __ATTR(out_intr_mask, S_IRUGO, vmbus_show_device_attr, NULL), | |
257 | __ATTR(out_read_index, S_IRUGO, vmbus_show_device_attr, NULL), | |
258 | __ATTR(out_write_index, S_IRUGO, vmbus_show_device_attr, NULL), | |
259 | __ATTR(out_read_bytes_avail, S_IRUGO, vmbus_show_device_attr, NULL), | |
260 | __ATTR(out_write_bytes_avail, S_IRUGO, vmbus_show_device_attr, NULL), | |
261 | ||
262 | __ATTR(in_intr_mask, S_IRUGO, vmbus_show_device_attr, NULL), | |
263 | __ATTR(in_read_index, S_IRUGO, vmbus_show_device_attr, NULL), | |
264 | __ATTR(in_write_index, S_IRUGO, vmbus_show_device_attr, NULL), | |
265 | __ATTR(in_read_bytes_avail, S_IRUGO, vmbus_show_device_attr, NULL), | |
266 | __ATTR(in_write_bytes_avail, S_IRUGO, vmbus_show_device_attr, NULL), | |
267 | __ATTR_NULL | |
268 | }; | |
3e7ee490 | 269 | |
793be9c7 | 270 | |
adde2487 S |
271 | /* |
272 | * vmbus_uevent - add uevent for our device | |
273 | * | |
274 | * This routine is invoked when a device is added or removed on the vmbus to | |
275 | * generate a uevent to udev in the userspace. The udev will then look at its | |
276 | * rule and the uevent generated here to load the appropriate driver | |
0ddda660 S |
277 | * |
278 | * The alias string will be of the form vmbus:guid where guid is the string | |
279 | * representation of the device guid (each byte of the guid will be | |
280 | * represented with two hex characters. | |
adde2487 S |
281 | */ |
282 | static int vmbus_uevent(struct device *device, struct kobj_uevent_env *env) | |
283 | { | |
284 | struct hv_device *dev = device_to_hv_device(device); | |
fd776ba9 OH |
285 | int ret; |
286 | char alias_name[VMBUS_ALIAS_LEN + 1]; | |
0ddda660 | 287 | |
fd776ba9 | 288 | print_alias_name(dev, alias_name); |
0ddda660 S |
289 | ret = add_uevent_var(env, "MODALIAS=vmbus:%s", alias_name); |
290 | return ret; | |
adde2487 S |
291 | } |
292 | ||
5841a829 S |
293 | static uuid_le null_guid; |
294 | ||
295 | static inline bool is_null_guid(const __u8 *guid) | |
296 | { | |
297 | if (memcmp(guid, &null_guid, sizeof(uuid_le))) | |
298 | return false; | |
299 | return true; | |
300 | } | |
301 | ||
3037a7b6 S |
302 | /* |
303 | * Return a matching hv_vmbus_device_id pointer. | |
304 | * If there is no match, return NULL. | |
305 | */ | |
306 | static const struct hv_vmbus_device_id *hv_vmbus_get_id( | |
307 | const struct hv_vmbus_device_id *id, | |
308 | __u8 *guid) | |
309 | { | |
310 | for (; !is_null_guid(id->guid); id++) | |
311 | if (!memcmp(&id->guid, guid, sizeof(uuid_le))) | |
312 | return id; | |
313 | ||
314 | return NULL; | |
315 | } | |
316 | ||
317 | ||
b7fc147b S |
318 | |
319 | /* | |
320 | * vmbus_match - Attempt to match the specified device to the specified driver | |
321 | */ | |
322 | static int vmbus_match(struct device *device, struct device_driver *driver) | |
323 | { | |
b7fc147b | 324 | struct hv_driver *drv = drv_to_hv_drv(driver); |
e8e27047 | 325 | struct hv_device *hv_dev = device_to_hv_device(device); |
b7fc147b | 326 | |
3037a7b6 S |
327 | if (hv_vmbus_get_id(drv->id_table, hv_dev->dev_type.b)) |
328 | return 1; | |
de632a2b | 329 | |
5841a829 | 330 | return 0; |
b7fc147b S |
331 | } |
332 | ||
f1f0d67b S |
333 | /* |
334 | * vmbus_probe - Add the new vmbus's child device | |
335 | */ | |
336 | static int vmbus_probe(struct device *child_device) | |
337 | { | |
338 | int ret = 0; | |
339 | struct hv_driver *drv = | |
340 | drv_to_hv_drv(child_device->driver); | |
9efd21e1 | 341 | struct hv_device *dev = device_to_hv_device(child_device); |
84946899 | 342 | const struct hv_vmbus_device_id *dev_id; |
f1f0d67b | 343 | |
84946899 | 344 | dev_id = hv_vmbus_get_id(drv->id_table, dev->dev_type.b); |
9efd21e1 | 345 | if (drv->probe) { |
84946899 | 346 | ret = drv->probe(dev, dev_id); |
b14a7b30 | 347 | if (ret != 0) |
0a46618d HJ |
348 | pr_err("probe failed for device %s (%d)\n", |
349 | dev_name(child_device), ret); | |
f1f0d67b | 350 | |
f1f0d67b | 351 | } else { |
0a46618d HJ |
352 | pr_err("probe not set for driver %s\n", |
353 | dev_name(child_device)); | |
6de925b1 | 354 | ret = -ENODEV; |
f1f0d67b S |
355 | } |
356 | return ret; | |
357 | } | |
358 | ||
c5dce3db S |
359 | /* |
360 | * vmbus_remove - Remove a vmbus device | |
361 | */ | |
362 | static int vmbus_remove(struct device *child_device) | |
363 | { | |
d4372179 | 364 | struct hv_driver *drv = drv_to_hv_drv(child_device->driver); |
415b023a | 365 | struct hv_device *dev = device_to_hv_device(child_device); |
c5dce3db | 366 | |
d4372179 S |
367 | if (drv->remove) |
368 | drv->remove(dev); | |
369 | else | |
370 | pr_err("remove not set for driver %s\n", | |
371 | dev_name(child_device)); | |
c5dce3db S |
372 | |
373 | return 0; | |
374 | } | |
375 | ||
eb1bb259 S |
376 | |
377 | /* | |
378 | * vmbus_shutdown - Shutdown a vmbus device | |
379 | */ | |
380 | static void vmbus_shutdown(struct device *child_device) | |
381 | { | |
382 | struct hv_driver *drv; | |
ca6887fb | 383 | struct hv_device *dev = device_to_hv_device(child_device); |
eb1bb259 S |
384 | |
385 | ||
386 | /* The device may not be attached yet */ | |
387 | if (!child_device->driver) | |
388 | return; | |
389 | ||
390 | drv = drv_to_hv_drv(child_device->driver); | |
391 | ||
ca6887fb S |
392 | if (drv->shutdown) |
393 | drv->shutdown(dev); | |
eb1bb259 S |
394 | |
395 | return; | |
396 | } | |
397 | ||
086e7a56 S |
398 | |
399 | /* | |
400 | * vmbus_device_release - Final callback release of the vmbus child device | |
401 | */ | |
402 | static void vmbus_device_release(struct device *device) | |
403 | { | |
e8e27047 | 404 | struct hv_device *hv_dev = device_to_hv_device(device); |
086e7a56 | 405 | |
e8e27047 | 406 | kfree(hv_dev); |
086e7a56 S |
407 | |
408 | } | |
409 | ||
454f18a9 | 410 | /* The one and only one */ |
9adcac5c S |
411 | static struct bus_type hv_bus = { |
412 | .name = "vmbus", | |
413 | .match = vmbus_match, | |
414 | .shutdown = vmbus_shutdown, | |
415 | .remove = vmbus_remove, | |
416 | .probe = vmbus_probe, | |
417 | .uevent = vmbus_uevent, | |
418 | .dev_attrs = vmbus_device_attrs, | |
3e7ee490 HJ |
419 | }; |
420 | ||
adf874cb | 421 | static const char *driver_name = "hyperv"; |
36199a99 | 422 | |
36199a99 | 423 | |
bf6506f6 TT |
424 | struct onmessage_work_context { |
425 | struct work_struct work; | |
426 | struct hv_message msg; | |
427 | }; | |
428 | ||
429 | static void vmbus_onmessage_work(struct work_struct *work) | |
430 | { | |
431 | struct onmessage_work_context *ctx; | |
432 | ||
433 | ctx = container_of(work, struct onmessage_work_context, | |
434 | work); | |
435 | vmbus_onmessage(&ctx->msg); | |
436 | kfree(ctx); | |
437 | } | |
438 | ||
62c1059d | 439 | static void vmbus_on_msg_dpc(unsigned long data) |
36199a99 GKH |
440 | { |
441 | int cpu = smp_processor_id(); | |
442 | void *page_addr = hv_context.synic_message_page[cpu]; | |
443 | struct hv_message *msg = (struct hv_message *)page_addr + | |
444 | VMBUS_MESSAGE_SINT; | |
bf6506f6 | 445 | struct onmessage_work_context *ctx; |
36199a99 GKH |
446 | |
447 | while (1) { | |
448 | if (msg->header.message_type == HVMSG_NONE) { | |
449 | /* no msg */ | |
450 | break; | |
451 | } else { | |
bf6506f6 TT |
452 | ctx = kmalloc(sizeof(*ctx), GFP_ATOMIC); |
453 | if (ctx == NULL) | |
36199a99 | 454 | continue; |
bf6506f6 TT |
455 | INIT_WORK(&ctx->work, vmbus_onmessage_work); |
456 | memcpy(&ctx->msg, msg, sizeof(*msg)); | |
da9fcb72 | 457 | queue_work(vmbus_connection.work_queue, &ctx->work); |
36199a99 GKH |
458 | } |
459 | ||
460 | msg->header.message_type = HVMSG_NONE; | |
461 | ||
462 | /* | |
463 | * Make sure the write to MessageType (ie set to | |
464 | * HVMSG_NONE) happens before we read the | |
465 | * MessagePending and EOMing. Otherwise, the EOMing | |
466 | * will not deliver any more messages since there is | |
467 | * no empty slot | |
468 | */ | |
e826f1d5 | 469 | smp_mb(); |
36199a99 GKH |
470 | |
471 | if (msg->header.message_flags.msg_pending) { | |
472 | /* | |
473 | * This will cause message queue rescan to | |
474 | * possibly deliver another msg from the | |
475 | * hypervisor | |
476 | */ | |
477 | wrmsrl(HV_X64_MSR_EOM, 0); | |
478 | } | |
479 | } | |
480 | } | |
481 | ||
ae4636e6 | 482 | static irqreturn_t vmbus_isr(int irq, void *dev_id) |
36199a99 | 483 | { |
36199a99 GKH |
484 | int cpu = smp_processor_id(); |
485 | void *page_addr; | |
486 | struct hv_message *msg; | |
487 | union hv_synic_event_flags *event; | |
ae4636e6 | 488 | bool handled = false; |
36199a99 | 489 | |
7341d908 S |
490 | /* |
491 | * Check for events before checking for messages. This is the order | |
492 | * in which events and messages are checked in Windows guests on | |
493 | * Hyper-V, and the Windows team suggested we do the same. | |
494 | */ | |
36199a99 | 495 | |
36199a99 GKH |
496 | page_addr = hv_context.synic_event_page[cpu]; |
497 | event = (union hv_synic_event_flags *)page_addr + VMBUS_MESSAGE_SINT; | |
498 | ||
499 | /* Since we are a child, we only need to check bit 0 */ | |
ae4636e6 S |
500 | if (sync_test_and_clear_bit(0, (unsigned long *) &event->flags32[0])) { |
501 | handled = true; | |
502 | tasklet_schedule(&event_dpc); | |
503 | } | |
793be9c7 | 504 | |
7341d908 S |
505 | page_addr = hv_context.synic_message_page[cpu]; |
506 | msg = (struct hv_message *)page_addr + VMBUS_MESSAGE_SINT; | |
507 | ||
508 | /* Check if there are actual msgs to be processed */ | |
509 | if (msg->header.message_type != HVMSG_NONE) { | |
510 | handled = true; | |
511 | tasklet_schedule(&msg_dpc); | |
512 | } | |
513 | ||
ae4636e6 | 514 | if (handled) |
793be9c7 | 515 | return IRQ_HANDLED; |
ae4636e6 | 516 | else |
793be9c7 | 517 | return IRQ_NONE; |
793be9c7 S |
518 | } |
519 | ||
3e189519 | 520 | /* |
90c9960e GKH |
521 | * vmbus_bus_init -Main vmbus driver initialization routine. |
522 | * | |
523 | * Here, we | |
0686e4f4 | 524 | * - initialize the vmbus driver context |
0686e4f4 LL |
525 | * - invoke the vmbus hv main init routine |
526 | * - get the irq resource | |
0686e4f4 | 527 | * - retrieve the channel offers |
90c9960e | 528 | */ |
9aaa995e | 529 | static int vmbus_bus_init(int irq) |
3e7ee490 | 530 | { |
90c9960e GKH |
531 | int ret; |
532 | unsigned int vector; | |
3e7ee490 | 533 | |
6d26e38f GKH |
534 | /* Hypervisor initialization...setup hypercall page..etc */ |
535 | ret = hv_init(); | |
90c9960e | 536 | if (ret != 0) { |
0a46618d | 537 | pr_err("Unable to initialize the hypervisor - 0x%x\n", ret); |
d6c1c5de | 538 | return ret; |
3e7ee490 HJ |
539 | } |
540 | ||
59c0e4f0 | 541 | tasklet_init(&msg_dpc, vmbus_on_msg_dpc, 0); |
66d9229c | 542 | tasklet_init(&event_dpc, vmbus_on_event, 0); |
3e7ee490 | 543 | |
9adcac5c | 544 | ret = bus_register(&hv_bus); |
d6c1c5de | 545 | if (ret) |
8b9987e9 | 546 | goto err_cleanup; |
3e7ee490 | 547 | |
20ed3ef7 | 548 | ret = request_irq(irq, vmbus_isr, 0, driver_name, hv_acpi_dev); |
3e7ee490 | 549 | |
90c9960e | 550 | if (ret != 0) { |
0a46618d | 551 | pr_err("Unable to request IRQ %d\n", |
9aaa995e | 552 | irq); |
8b9987e9 | 553 | goto err_unregister; |
3e7ee490 | 554 | } |
3e7ee490 | 555 | |
9aaa995e | 556 | vector = IRQ0_VECTOR + irq; |
3e7ee490 | 557 | |
800b6902 S |
558 | /* |
559 | * Notify the hypervisor of our irq and | |
560 | * connect to the host. | |
561 | */ | |
562 | on_each_cpu(hv_synic_init, (void *)&vector, 1); | |
563 | ret = vmbus_connect(); | |
8b9987e9 S |
564 | if (ret) |
565 | goto err_irq; | |
800b6902 | 566 | |
2d6e882b | 567 | vmbus_request_offers(); |
8b5d6d3b | 568 | |
d6c1c5de | 569 | return 0; |
8b9987e9 S |
570 | |
571 | err_irq: | |
572 | free_irq(irq, hv_acpi_dev); | |
573 | ||
574 | err_unregister: | |
575 | bus_unregister(&hv_bus); | |
576 | ||
577 | err_cleanup: | |
578 | hv_cleanup(); | |
579 | ||
580 | return ret; | |
3e7ee490 HJ |
581 | } |
582 | ||
90c9960e | 583 | /** |
768fa219 GKH |
584 | * __vmbus_child_driver_register - Register a vmbus's driver |
585 | * @drv: Pointer to driver structure you want to register | |
586 | * @owner: owner module of the drv | |
587 | * @mod_name: module name string | |
3e189519 HJ |
588 | * |
589 | * Registers the given driver with Linux through the 'driver_register()' call | |
768fa219 | 590 | * and sets up the hyper-v vmbus handling for this driver. |
3e189519 HJ |
591 | * It will return the state of the 'driver_register()' call. |
592 | * | |
90c9960e | 593 | */ |
768fa219 | 594 | int __vmbus_driver_register(struct hv_driver *hv_driver, struct module *owner, const char *mod_name) |
3e7ee490 | 595 | { |
5d48a1c2 | 596 | int ret; |
3e7ee490 | 597 | |
768fa219 | 598 | pr_info("registering driver %s\n", hv_driver->name); |
3e7ee490 | 599 | |
cf6a2eac S |
600 | ret = vmbus_exists(); |
601 | if (ret < 0) | |
602 | return ret; | |
603 | ||
768fa219 GKH |
604 | hv_driver->driver.name = hv_driver->name; |
605 | hv_driver->driver.owner = owner; | |
606 | hv_driver->driver.mod_name = mod_name; | |
607 | hv_driver->driver.bus = &hv_bus; | |
3e7ee490 | 608 | |
768fa219 | 609 | ret = driver_register(&hv_driver->driver); |
3e7ee490 | 610 | |
2d6e882b | 611 | vmbus_request_offers(); |
3e7ee490 | 612 | |
5d48a1c2 | 613 | return ret; |
3e7ee490 | 614 | } |
768fa219 | 615 | EXPORT_SYMBOL_GPL(__vmbus_driver_register); |
3e7ee490 | 616 | |
90c9960e | 617 | /** |
768fa219 GKH |
618 | * vmbus_driver_unregister() - Unregister a vmbus's driver |
619 | * @drv: Pointer to driver structure you want to un-register | |
3e189519 | 620 | * |
768fa219 GKH |
621 | * Un-register the given driver that was previous registered with a call to |
622 | * vmbus_driver_register() | |
90c9960e | 623 | */ |
768fa219 | 624 | void vmbus_driver_unregister(struct hv_driver *hv_driver) |
3e7ee490 | 625 | { |
768fa219 | 626 | pr_info("unregistering driver %s\n", hv_driver->name); |
3e7ee490 | 627 | |
cf6a2eac | 628 | if (!vmbus_exists()) |
8f257a14 | 629 | driver_unregister(&hv_driver->driver); |
3e7ee490 | 630 | } |
768fa219 | 631 | EXPORT_SYMBOL_GPL(vmbus_driver_unregister); |
3e7ee490 | 632 | |
3e189519 | 633 | /* |
f2c73011 | 634 | * vmbus_device_create - Creates and registers a new child device |
3e189519 | 635 | * on the vmbus. |
90c9960e | 636 | */ |
f2c73011 | 637 | struct hv_device *vmbus_device_create(uuid_le *type, |
358d2ee2 | 638 | uuid_le *instance, |
89733aa9 | 639 | struct vmbus_channel *channel) |
3e7ee490 | 640 | { |
3d3b5518 | 641 | struct hv_device *child_device_obj; |
3e7ee490 | 642 | |
6bad88da S |
643 | child_device_obj = kzalloc(sizeof(struct hv_device), GFP_KERNEL); |
644 | if (!child_device_obj) { | |
0a46618d | 645 | pr_err("Unable to allocate device object for child device\n"); |
3e7ee490 HJ |
646 | return NULL; |
647 | } | |
648 | ||
cae5b843 | 649 | child_device_obj->channel = channel; |
358d2ee2 | 650 | memcpy(&child_device_obj->dev_type, type, sizeof(uuid_le)); |
ca623ad3 | 651 | memcpy(&child_device_obj->dev_instance, instance, |
358d2ee2 | 652 | sizeof(uuid_le)); |
3e7ee490 | 653 | |
3e7ee490 | 654 | |
3e7ee490 HJ |
655 | return child_device_obj; |
656 | } | |
657 | ||
3e189519 | 658 | /* |
22794281 | 659 | * vmbus_device_register - Register the child device |
90c9960e | 660 | */ |
22794281 | 661 | int vmbus_device_register(struct hv_device *child_device_obj) |
3e7ee490 | 662 | { |
90c9960e | 663 | int ret = 0; |
6bad88da | 664 | |
f4888417 | 665 | static atomic_t device_num = ATOMIC_INIT(0); |
3e7ee490 | 666 | |
6bad88da | 667 | dev_set_name(&child_device_obj->device, "vmbus_0_%d", |
90c9960e | 668 | atomic_inc_return(&device_num)); |
3e7ee490 | 669 | |
0bce28b6 | 670 | child_device_obj->device.bus = &hv_bus; |
607c1a11 | 671 | child_device_obj->device.parent = &hv_acpi_dev->dev; |
6bad88da | 672 | child_device_obj->device.release = vmbus_device_release; |
3e7ee490 | 673 | |
90c9960e GKH |
674 | /* |
675 | * Register with the LDM. This will kick off the driver/device | |
676 | * binding...which will eventually call vmbus_match() and vmbus_probe() | |
677 | */ | |
6bad88da | 678 | ret = device_register(&child_device_obj->device); |
3e7ee490 | 679 | |
3e7ee490 | 680 | if (ret) |
0a46618d | 681 | pr_err("Unable to register child device\n"); |
3e7ee490 | 682 | else |
0a46618d HJ |
683 | pr_info("child device %s registered\n", |
684 | dev_name(&child_device_obj->device)); | |
3e7ee490 | 685 | |
3e7ee490 HJ |
686 | return ret; |
687 | } | |
688 | ||
3e189519 | 689 | /* |
696453ba | 690 | * vmbus_device_unregister - Remove the specified child device |
3e189519 | 691 | * from the vmbus. |
90c9960e | 692 | */ |
696453ba | 693 | void vmbus_device_unregister(struct hv_device *device_obj) |
3e7ee490 | 694 | { |
90c9960e GKH |
695 | /* |
696 | * Kick off the process of unregistering the device. | |
697 | * This will call vmbus_remove() and eventually vmbus_device_release() | |
698 | */ | |
6bad88da | 699 | device_unregister(&device_obj->device); |
3e7ee490 | 700 | |
0a46618d HJ |
701 | pr_info("child device %s unregistered\n", |
702 | dev_name(&device_obj->device)); | |
3e7ee490 HJ |
703 | } |
704 | ||
3e7ee490 | 705 | |
b0069f43 S |
706 | /* |
707 | * VMBUS is an acpi enumerated device. Get the the IRQ information | |
708 | * from DSDT. | |
709 | */ | |
710 | ||
711 | static acpi_status vmbus_walk_resources(struct acpi_resource *res, void *irq) | |
712 | { | |
713 | ||
714 | if (res->type == ACPI_RESOURCE_TYPE_IRQ) { | |
715 | struct acpi_resource_irq *irqp; | |
716 | irqp = &res->data.irq; | |
717 | ||
718 | *((unsigned int *)irq) = irqp->interrupts[0]; | |
719 | } | |
720 | ||
721 | return AE_OK; | |
722 | } | |
723 | ||
724 | static int vmbus_acpi_add(struct acpi_device *device) | |
725 | { | |
726 | acpi_status result; | |
727 | ||
607c1a11 S |
728 | hv_acpi_dev = device; |
729 | ||
0a4425b6 S |
730 | result = acpi_walk_resources(device->handle, METHOD_NAME__CRS, |
731 | vmbus_walk_resources, &irq); | |
b0069f43 S |
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); | |
cf6a2eac | 790 | hv_acpi_dev = NULL; |
91fd799e | 791 | return ret; |
1168ac22 S |
792 | } |
793 | ||
93e5bd06 S |
794 | static void __exit vmbus_exit(void) |
795 | { | |
796 | ||
797 | free_irq(irq, hv_acpi_dev); | |
798 | vmbus_free_channels(); | |
799 | bus_unregister(&hv_bus); | |
800 | hv_cleanup(); | |
801 | acpi_bus_unregister_driver(&vmbus_acpi_driver); | |
802 | } | |
803 | ||
1168ac22 | 804 | |
90c9960e | 805 | MODULE_LICENSE("GPL"); |
26c14cc1 | 806 | MODULE_VERSION(HV_DRV_VERSION); |
3e7ee490 | 807 | |
43d4e119 | 808 | subsys_initcall(hv_acpi_init); |
93e5bd06 | 809 | module_exit(vmbus_exit); |