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> |
b0209501 | 36 | #include <linux/kernel_stat.h> |
407dd164 | 37 | #include <asm/hyperv.h> |
1f94ea81 | 38 | #include <asm/hypervisor.h> |
302a3c0f | 39 | #include <asm/mshyperv.h> |
0f2a6619 | 40 | #include "hyperv_vmbus.h" |
3e7ee490 | 41 | |
3e7ee490 | 42 | |
607c1a11 | 43 | static struct acpi_device *hv_acpi_dev; |
1168ac22 | 44 | |
59c0e4f0 | 45 | static struct tasklet_struct msg_dpc; |
71a6655d | 46 | static struct completion probe_event; |
b0069f43 | 47 | static int irq; |
98db4335 | 48 | |
15b80d64 | 49 | struct hv_device_info { |
15b80d64 GKH |
50 | u32 server_monitor_pending; |
51 | u32 server_monitor_latency; | |
52 | u32 server_monitor_conn_id; | |
53 | u32 client_monitor_pending; | |
54 | u32 client_monitor_latency; | |
55 | u32 client_monitor_conn_id; | |
56 | ||
57 | struct hv_dev_port_info inbound; | |
58 | struct hv_dev_port_info outbound; | |
59 | }; | |
60 | ||
cf6a2eac S |
61 | static int vmbus_exists(void) |
62 | { | |
63 | if (hv_acpi_dev == NULL) | |
64 | return -ENODEV; | |
65 | ||
66 | return 0; | |
67 | } | |
68 | ||
15b80d64 | 69 | |
98db4335 S |
70 | static void get_channel_info(struct hv_device *device, |
71 | struct hv_device_info *info) | |
72 | { | |
73 | struct vmbus_channel_debug_info debug_info; | |
74 | ||
75 | if (!device->channel) | |
76 | return; | |
77 | ||
78 | vmbus_get_debug_info(device->channel, &debug_info); | |
79 | ||
98db4335 S |
80 | info->server_monitor_pending = debug_info.servermonitor_pending; |
81 | info->server_monitor_latency = debug_info.servermonitor_latency; | |
82 | info->server_monitor_conn_id = debug_info.servermonitor_connectionid; | |
83 | ||
84 | info->client_monitor_pending = debug_info.clientmonitor_pending; | |
85 | info->client_monitor_latency = debug_info.clientmonitor_latency; | |
86 | info->client_monitor_conn_id = debug_info.clientmonitor_connectionid; | |
87 | ||
88 | info->inbound.int_mask = debug_info.inbound.current_interrupt_mask; | |
89 | info->inbound.read_idx = debug_info.inbound.current_read_index; | |
90 | info->inbound.write_idx = debug_info.inbound.current_write_index; | |
91 | info->inbound.bytes_avail_toread = | |
92 | debug_info.inbound.bytes_avail_toread; | |
93 | info->inbound.bytes_avail_towrite = | |
94 | debug_info.inbound.bytes_avail_towrite; | |
3e7ee490 | 95 | |
98db4335 S |
96 | info->outbound.int_mask = |
97 | debug_info.outbound.current_interrupt_mask; | |
98 | info->outbound.read_idx = debug_info.outbound.current_read_index; | |
99 | info->outbound.write_idx = debug_info.outbound.current_write_index; | |
100 | info->outbound.bytes_avail_toread = | |
101 | debug_info.outbound.bytes_avail_toread; | |
102 | info->outbound.bytes_avail_towrite = | |
103 | debug_info.outbound.bytes_avail_towrite; | |
104 | } | |
3e7ee490 | 105 | |
fd776ba9 OH |
106 | #define VMBUS_ALIAS_LEN ((sizeof((struct hv_vmbus_device_id *)0)->guid) * 2) |
107 | static void print_alias_name(struct hv_device *hv_dev, char *alias_name) | |
108 | { | |
109 | int i; | |
110 | for (i = 0; i < VMBUS_ALIAS_LEN; i += 2) | |
111 | sprintf(&alias_name[i], "%02x", hv_dev->dev_type.b[i/2]); | |
112 | } | |
113 | ||
98db4335 S |
114 | /* |
115 | * vmbus_show_device_attr - Show the device attribute in sysfs. | |
116 | * | |
117 | * This is invoked when user does a | |
118 | * "cat /sys/bus/vmbus/devices/<busdevice>/<attr name>" | |
119 | */ | |
90c9960e GKH |
120 | static ssize_t vmbus_show_device_attr(struct device *dev, |
121 | struct device_attribute *dev_attr, | |
98db4335 S |
122 | char *buf) |
123 | { | |
e8e27047 | 124 | struct hv_device *hv_dev = device_to_hv_device(dev); |
7bb52384 | 125 | struct hv_device_info *device_info; |
7bb52384 | 126 | int ret = 0; |
3e7ee490 | 127 | |
7bb52384 S |
128 | device_info = kzalloc(sizeof(struct hv_device_info), GFP_KERNEL); |
129 | if (!device_info) | |
130 | return ret; | |
3e7ee490 | 131 | |
7bb52384 | 132 | get_channel_info(hv_dev, device_info); |
3e7ee490 | 133 | |
7c55e1d0 | 134 | if (!strcmp(dev_attr->attr.name, "out_intr_mask")) { |
7bb52384 | 135 | ret = sprintf(buf, "%d\n", device_info->outbound.int_mask); |
98db4335 | 136 | } else if (!strcmp(dev_attr->attr.name, "out_read_index")) { |
7bb52384 | 137 | ret = sprintf(buf, "%d\n", device_info->outbound.read_idx); |
98db4335 | 138 | } else if (!strcmp(dev_attr->attr.name, "out_write_index")) { |
7bb52384 | 139 | ret = sprintf(buf, "%d\n", device_info->outbound.write_idx); |
98db4335 | 140 | } else if (!strcmp(dev_attr->attr.name, "out_read_bytes_avail")) { |
7bb52384 S |
141 | ret = sprintf(buf, "%d\n", |
142 | device_info->outbound.bytes_avail_toread); | |
98db4335 | 143 | } else if (!strcmp(dev_attr->attr.name, "out_write_bytes_avail")) { |
7bb52384 S |
144 | ret = sprintf(buf, "%d\n", |
145 | device_info->outbound.bytes_avail_towrite); | |
98db4335 | 146 | } else if (!strcmp(dev_attr->attr.name, "in_intr_mask")) { |
7bb52384 | 147 | ret = sprintf(buf, "%d\n", device_info->inbound.int_mask); |
98db4335 | 148 | } else if (!strcmp(dev_attr->attr.name, "in_read_index")) { |
7bb52384 | 149 | ret = sprintf(buf, "%d\n", device_info->inbound.read_idx); |
98db4335 | 150 | } else if (!strcmp(dev_attr->attr.name, "in_write_index")) { |
7bb52384 | 151 | ret = sprintf(buf, "%d\n", device_info->inbound.write_idx); |
98db4335 | 152 | } else if (!strcmp(dev_attr->attr.name, "in_read_bytes_avail")) { |
7bb52384 S |
153 | ret = sprintf(buf, "%d\n", |
154 | device_info->inbound.bytes_avail_toread); | |
98db4335 | 155 | } else if (!strcmp(dev_attr->attr.name, "in_write_bytes_avail")) { |
7bb52384 S |
156 | ret = sprintf(buf, "%d\n", |
157 | device_info->inbound.bytes_avail_towrite); | |
98db4335 | 158 | } else if (!strcmp(dev_attr->attr.name, "server_monitor_pending")) { |
7bb52384 | 159 | ret = sprintf(buf, "%d\n", device_info->server_monitor_pending); |
98db4335 | 160 | } else if (!strcmp(dev_attr->attr.name, "server_monitor_latency")) { |
7bb52384 | 161 | ret = sprintf(buf, "%d\n", device_info->server_monitor_latency); |
98db4335 | 162 | } else if (!strcmp(dev_attr->attr.name, "server_monitor_conn_id")) { |
7bb52384 S |
163 | ret = sprintf(buf, "%d\n", |
164 | device_info->server_monitor_conn_id); | |
98db4335 | 165 | } else if (!strcmp(dev_attr->attr.name, "client_monitor_pending")) { |
7bb52384 | 166 | ret = sprintf(buf, "%d\n", device_info->client_monitor_pending); |
98db4335 | 167 | } else if (!strcmp(dev_attr->attr.name, "client_monitor_latency")) { |
7bb52384 | 168 | ret = sprintf(buf, "%d\n", device_info->client_monitor_latency); |
98db4335 | 169 | } else if (!strcmp(dev_attr->attr.name, "client_monitor_conn_id")) { |
7bb52384 S |
170 | ret = sprintf(buf, "%d\n", |
171 | device_info->client_monitor_conn_id); | |
98db4335 | 172 | } |
7bb52384 S |
173 | |
174 | kfree(device_info); | |
175 | return ret; | |
98db4335 | 176 | } |
3e7ee490 | 177 | |
03f3a910 GKH |
178 | static ssize_t id_show(struct device *dev, struct device_attribute *dev_attr, |
179 | char *buf) | |
180 | { | |
181 | struct hv_device *hv_dev = device_to_hv_device(dev); | |
182 | ||
183 | if (!hv_dev->channel) | |
184 | return -ENODEV; | |
185 | return sprintf(buf, "%d\n", hv_dev->channel->offermsg.child_relid); | |
186 | } | |
187 | static DEVICE_ATTR_RO(id); | |
188 | ||
a8fb5f3d GKH |
189 | static ssize_t state_show(struct device *dev, struct device_attribute *dev_attr, |
190 | char *buf) | |
191 | { | |
192 | struct hv_device *hv_dev = device_to_hv_device(dev); | |
193 | ||
194 | if (!hv_dev->channel) | |
195 | return -ENODEV; | |
196 | return sprintf(buf, "%d\n", hv_dev->channel->state); | |
197 | } | |
198 | static DEVICE_ATTR_RO(state); | |
199 | ||
5ffd00e2 GKH |
200 | static ssize_t monitor_id_show(struct device *dev, |
201 | struct device_attribute *dev_attr, char *buf) | |
202 | { | |
203 | struct hv_device *hv_dev = device_to_hv_device(dev); | |
204 | ||
205 | if (!hv_dev->channel) | |
206 | return -ENODEV; | |
207 | return sprintf(buf, "%d\n", hv_dev->channel->offermsg.monitorid); | |
208 | } | |
209 | static DEVICE_ATTR_RO(monitor_id); | |
210 | ||
68234c04 GKH |
211 | static ssize_t class_id_show(struct device *dev, |
212 | struct device_attribute *dev_attr, char *buf) | |
213 | { | |
214 | struct hv_device *hv_dev = device_to_hv_device(dev); | |
215 | ||
216 | if (!hv_dev->channel) | |
217 | return -ENODEV; | |
218 | return sprintf(buf, "{%pUl}\n", | |
219 | hv_dev->channel->offermsg.offer.if_type.b); | |
220 | } | |
221 | static DEVICE_ATTR_RO(class_id); | |
222 | ||
7c55e1d0 GKH |
223 | static ssize_t device_id_show(struct device *dev, |
224 | struct device_attribute *dev_attr, char *buf) | |
225 | { | |
226 | struct hv_device *hv_dev = device_to_hv_device(dev); | |
227 | ||
228 | if (!hv_dev->channel) | |
229 | return -ENODEV; | |
230 | return sprintf(buf, "{%pUl}\n", | |
231 | hv_dev->channel->offermsg.offer.if_instance.b); | |
232 | } | |
233 | static DEVICE_ATTR_RO(device_id); | |
234 | ||
647fa371 GKH |
235 | static ssize_t modalias_show(struct device *dev, |
236 | struct device_attribute *dev_attr, char *buf) | |
237 | { | |
238 | struct hv_device *hv_dev = device_to_hv_device(dev); | |
239 | char alias_name[VMBUS_ALIAS_LEN + 1]; | |
240 | ||
241 | print_alias_name(hv_dev, alias_name); | |
242 | return sprintf(buf, "vmbus:%s\n", alias_name); | |
243 | } | |
244 | static DEVICE_ATTR_RO(modalias); | |
245 | ||
68234c04 | 246 | |
03f3a910 GKH |
247 | static struct attribute *vmbus_attrs[] = { |
248 | &dev_attr_id.attr, | |
a8fb5f3d | 249 | &dev_attr_state.attr, |
5ffd00e2 | 250 | &dev_attr_monitor_id.attr, |
68234c04 | 251 | &dev_attr_class_id.attr, |
7c55e1d0 | 252 | &dev_attr_device_id.attr, |
647fa371 | 253 | &dev_attr_modalias.attr, |
03f3a910 GKH |
254 | NULL, |
255 | }; | |
256 | ATTRIBUTE_GROUPS(vmbus); | |
257 | ||
454f18a9 | 258 | /* Set up per device attributes in /sys/bus/vmbus/devices/<bus device> */ |
3e7ee490 | 259 | static struct device_attribute vmbus_device_attrs[] = { |
3e7ee490 HJ |
260 | __ATTR(server_monitor_pending, S_IRUGO, vmbus_show_device_attr, NULL), |
261 | __ATTR(server_monitor_latency, S_IRUGO, vmbus_show_device_attr, NULL), | |
262 | __ATTR(server_monitor_conn_id, S_IRUGO, vmbus_show_device_attr, NULL), | |
263 | ||
264 | __ATTR(client_monitor_pending, S_IRUGO, vmbus_show_device_attr, NULL), | |
265 | __ATTR(client_monitor_latency, S_IRUGO, vmbus_show_device_attr, NULL), | |
266 | __ATTR(client_monitor_conn_id, S_IRUGO, vmbus_show_device_attr, NULL), | |
267 | ||
268 | __ATTR(out_intr_mask, S_IRUGO, vmbus_show_device_attr, NULL), | |
269 | __ATTR(out_read_index, S_IRUGO, vmbus_show_device_attr, NULL), | |
270 | __ATTR(out_write_index, S_IRUGO, vmbus_show_device_attr, NULL), | |
271 | __ATTR(out_read_bytes_avail, S_IRUGO, vmbus_show_device_attr, NULL), | |
272 | __ATTR(out_write_bytes_avail, S_IRUGO, vmbus_show_device_attr, NULL), | |
273 | ||
274 | __ATTR(in_intr_mask, S_IRUGO, vmbus_show_device_attr, NULL), | |
275 | __ATTR(in_read_index, S_IRUGO, vmbus_show_device_attr, NULL), | |
276 | __ATTR(in_write_index, S_IRUGO, vmbus_show_device_attr, NULL), | |
277 | __ATTR(in_read_bytes_avail, S_IRUGO, vmbus_show_device_attr, NULL), | |
278 | __ATTR(in_write_bytes_avail, S_IRUGO, vmbus_show_device_attr, NULL), | |
279 | __ATTR_NULL | |
280 | }; | |
3e7ee490 | 281 | |
793be9c7 | 282 | |
adde2487 S |
283 | /* |
284 | * vmbus_uevent - add uevent for our device | |
285 | * | |
286 | * This routine is invoked when a device is added or removed on the vmbus to | |
287 | * generate a uevent to udev in the userspace. The udev will then look at its | |
288 | * rule and the uevent generated here to load the appropriate driver | |
0ddda660 S |
289 | * |
290 | * The alias string will be of the form vmbus:guid where guid is the string | |
291 | * representation of the device guid (each byte of the guid will be | |
292 | * represented with two hex characters. | |
adde2487 S |
293 | */ |
294 | static int vmbus_uevent(struct device *device, struct kobj_uevent_env *env) | |
295 | { | |
296 | struct hv_device *dev = device_to_hv_device(device); | |
fd776ba9 OH |
297 | int ret; |
298 | char alias_name[VMBUS_ALIAS_LEN + 1]; | |
0ddda660 | 299 | |
fd776ba9 | 300 | print_alias_name(dev, alias_name); |
0ddda660 S |
301 | ret = add_uevent_var(env, "MODALIAS=vmbus:%s", alias_name); |
302 | return ret; | |
adde2487 S |
303 | } |
304 | ||
5841a829 S |
305 | static uuid_le null_guid; |
306 | ||
307 | static inline bool is_null_guid(const __u8 *guid) | |
308 | { | |
309 | if (memcmp(guid, &null_guid, sizeof(uuid_le))) | |
310 | return false; | |
311 | return true; | |
312 | } | |
313 | ||
3037a7b6 S |
314 | /* |
315 | * Return a matching hv_vmbus_device_id pointer. | |
316 | * If there is no match, return NULL. | |
317 | */ | |
318 | static const struct hv_vmbus_device_id *hv_vmbus_get_id( | |
319 | const struct hv_vmbus_device_id *id, | |
320 | __u8 *guid) | |
321 | { | |
322 | for (; !is_null_guid(id->guid); id++) | |
323 | if (!memcmp(&id->guid, guid, sizeof(uuid_le))) | |
324 | return id; | |
325 | ||
326 | return NULL; | |
327 | } | |
328 | ||
329 | ||
b7fc147b S |
330 | |
331 | /* | |
332 | * vmbus_match - Attempt to match the specified device to the specified driver | |
333 | */ | |
334 | static int vmbus_match(struct device *device, struct device_driver *driver) | |
335 | { | |
b7fc147b | 336 | struct hv_driver *drv = drv_to_hv_drv(driver); |
e8e27047 | 337 | struct hv_device *hv_dev = device_to_hv_device(device); |
b7fc147b | 338 | |
3037a7b6 S |
339 | if (hv_vmbus_get_id(drv->id_table, hv_dev->dev_type.b)) |
340 | return 1; | |
de632a2b | 341 | |
5841a829 | 342 | return 0; |
b7fc147b S |
343 | } |
344 | ||
f1f0d67b S |
345 | /* |
346 | * vmbus_probe - Add the new vmbus's child device | |
347 | */ | |
348 | static int vmbus_probe(struct device *child_device) | |
349 | { | |
350 | int ret = 0; | |
351 | struct hv_driver *drv = | |
352 | drv_to_hv_drv(child_device->driver); | |
9efd21e1 | 353 | struct hv_device *dev = device_to_hv_device(child_device); |
84946899 | 354 | const struct hv_vmbus_device_id *dev_id; |
f1f0d67b | 355 | |
84946899 | 356 | dev_id = hv_vmbus_get_id(drv->id_table, dev->dev_type.b); |
9efd21e1 | 357 | if (drv->probe) { |
84946899 | 358 | ret = drv->probe(dev, dev_id); |
b14a7b30 | 359 | if (ret != 0) |
0a46618d HJ |
360 | pr_err("probe failed for device %s (%d)\n", |
361 | dev_name(child_device), ret); | |
f1f0d67b | 362 | |
f1f0d67b | 363 | } else { |
0a46618d HJ |
364 | pr_err("probe not set for driver %s\n", |
365 | dev_name(child_device)); | |
6de925b1 | 366 | ret = -ENODEV; |
f1f0d67b S |
367 | } |
368 | return ret; | |
369 | } | |
370 | ||
c5dce3db S |
371 | /* |
372 | * vmbus_remove - Remove a vmbus device | |
373 | */ | |
374 | static int vmbus_remove(struct device *child_device) | |
375 | { | |
d4372179 | 376 | struct hv_driver *drv = drv_to_hv_drv(child_device->driver); |
415b023a | 377 | struct hv_device *dev = device_to_hv_device(child_device); |
c5dce3db | 378 | |
d4372179 S |
379 | if (drv->remove) |
380 | drv->remove(dev); | |
381 | else | |
382 | pr_err("remove not set for driver %s\n", | |
383 | dev_name(child_device)); | |
c5dce3db S |
384 | |
385 | return 0; | |
386 | } | |
387 | ||
eb1bb259 S |
388 | |
389 | /* | |
390 | * vmbus_shutdown - Shutdown a vmbus device | |
391 | */ | |
392 | static void vmbus_shutdown(struct device *child_device) | |
393 | { | |
394 | struct hv_driver *drv; | |
ca6887fb | 395 | struct hv_device *dev = device_to_hv_device(child_device); |
eb1bb259 S |
396 | |
397 | ||
398 | /* The device may not be attached yet */ | |
399 | if (!child_device->driver) | |
400 | return; | |
401 | ||
402 | drv = drv_to_hv_drv(child_device->driver); | |
403 | ||
ca6887fb S |
404 | if (drv->shutdown) |
405 | drv->shutdown(dev); | |
eb1bb259 S |
406 | |
407 | return; | |
408 | } | |
409 | ||
086e7a56 S |
410 | |
411 | /* | |
412 | * vmbus_device_release - Final callback release of the vmbus child device | |
413 | */ | |
414 | static void vmbus_device_release(struct device *device) | |
415 | { | |
e8e27047 | 416 | struct hv_device *hv_dev = device_to_hv_device(device); |
086e7a56 | 417 | |
e8e27047 | 418 | kfree(hv_dev); |
086e7a56 S |
419 | |
420 | } | |
421 | ||
454f18a9 | 422 | /* The one and only one */ |
9adcac5c S |
423 | static struct bus_type hv_bus = { |
424 | .name = "vmbus", | |
425 | .match = vmbus_match, | |
426 | .shutdown = vmbus_shutdown, | |
427 | .remove = vmbus_remove, | |
428 | .probe = vmbus_probe, | |
429 | .uevent = vmbus_uevent, | |
430 | .dev_attrs = vmbus_device_attrs, | |
03f3a910 | 431 | .dev_groups = vmbus_groups, |
3e7ee490 HJ |
432 | }; |
433 | ||
adf874cb | 434 | static const char *driver_name = "hyperv"; |
36199a99 | 435 | |
36199a99 | 436 | |
bf6506f6 TT |
437 | struct onmessage_work_context { |
438 | struct work_struct work; | |
439 | struct hv_message msg; | |
440 | }; | |
441 | ||
442 | static void vmbus_onmessage_work(struct work_struct *work) | |
443 | { | |
444 | struct onmessage_work_context *ctx; | |
445 | ||
446 | ctx = container_of(work, struct onmessage_work_context, | |
447 | work); | |
448 | vmbus_onmessage(&ctx->msg); | |
449 | kfree(ctx); | |
450 | } | |
451 | ||
62c1059d | 452 | static void vmbus_on_msg_dpc(unsigned long data) |
36199a99 GKH |
453 | { |
454 | int cpu = smp_processor_id(); | |
455 | void *page_addr = hv_context.synic_message_page[cpu]; | |
456 | struct hv_message *msg = (struct hv_message *)page_addr + | |
457 | VMBUS_MESSAGE_SINT; | |
bf6506f6 | 458 | struct onmessage_work_context *ctx; |
36199a99 GKH |
459 | |
460 | while (1) { | |
461 | if (msg->header.message_type == HVMSG_NONE) { | |
462 | /* no msg */ | |
463 | break; | |
464 | } else { | |
bf6506f6 TT |
465 | ctx = kmalloc(sizeof(*ctx), GFP_ATOMIC); |
466 | if (ctx == NULL) | |
36199a99 | 467 | continue; |
bf6506f6 TT |
468 | INIT_WORK(&ctx->work, vmbus_onmessage_work); |
469 | memcpy(&ctx->msg, msg, sizeof(*msg)); | |
da9fcb72 | 470 | queue_work(vmbus_connection.work_queue, &ctx->work); |
36199a99 GKH |
471 | } |
472 | ||
473 | msg->header.message_type = HVMSG_NONE; | |
474 | ||
475 | /* | |
476 | * Make sure the write to MessageType (ie set to | |
477 | * HVMSG_NONE) happens before we read the | |
478 | * MessagePending and EOMing. Otherwise, the EOMing | |
479 | * will not deliver any more messages since there is | |
480 | * no empty slot | |
481 | */ | |
35848f68 | 482 | mb(); |
36199a99 GKH |
483 | |
484 | if (msg->header.message_flags.msg_pending) { | |
485 | /* | |
486 | * This will cause message queue rescan to | |
487 | * possibly deliver another msg from the | |
488 | * hypervisor | |
489 | */ | |
490 | wrmsrl(HV_X64_MSR_EOM, 0); | |
491 | } | |
492 | } | |
493 | } | |
494 | ||
ae4636e6 | 495 | static irqreturn_t vmbus_isr(int irq, void *dev_id) |
36199a99 | 496 | { |
36199a99 GKH |
497 | int cpu = smp_processor_id(); |
498 | void *page_addr; | |
499 | struct hv_message *msg; | |
500 | union hv_synic_event_flags *event; | |
ae4636e6 | 501 | bool handled = false; |
36199a99 | 502 | |
5ab05951 S |
503 | page_addr = hv_context.synic_event_page[cpu]; |
504 | if (page_addr == NULL) | |
505 | return IRQ_NONE; | |
506 | ||
507 | event = (union hv_synic_event_flags *)page_addr + | |
508 | VMBUS_MESSAGE_SINT; | |
7341d908 S |
509 | /* |
510 | * Check for events before checking for messages. This is the order | |
511 | * in which events and messages are checked in Windows guests on | |
512 | * Hyper-V, and the Windows team suggested we do the same. | |
513 | */ | |
36199a99 | 514 | |
6552ecd7 S |
515 | if ((vmbus_proto_version == VERSION_WS2008) || |
516 | (vmbus_proto_version == VERSION_WIN7)) { | |
36199a99 | 517 | |
6552ecd7 S |
518 | /* Since we are a child, we only need to check bit 0 */ |
519 | if (sync_test_and_clear_bit(0, | |
520 | (unsigned long *) &event->flags32[0])) { | |
521 | handled = true; | |
522 | } | |
523 | } else { | |
524 | /* | |
525 | * Our host is win8 or above. The signaling mechanism | |
526 | * has changed and we can directly look at the event page. | |
527 | * If bit n is set then we have an interrup on the channel | |
528 | * whose id is n. | |
529 | */ | |
ae4636e6 | 530 | handled = true; |
ae4636e6 | 531 | } |
793be9c7 | 532 | |
6552ecd7 | 533 | if (handled) |
db11f12a | 534 | tasklet_schedule(hv_context.event_dpc[cpu]); |
6552ecd7 S |
535 | |
536 | ||
7341d908 S |
537 | page_addr = hv_context.synic_message_page[cpu]; |
538 | msg = (struct hv_message *)page_addr + VMBUS_MESSAGE_SINT; | |
539 | ||
540 | /* Check if there are actual msgs to be processed */ | |
541 | if (msg->header.message_type != HVMSG_NONE) { | |
542 | handled = true; | |
543 | tasklet_schedule(&msg_dpc); | |
544 | } | |
545 | ||
ae4636e6 | 546 | if (handled) |
793be9c7 | 547 | return IRQ_HANDLED; |
ae4636e6 | 548 | else |
793be9c7 | 549 | return IRQ_NONE; |
793be9c7 S |
550 | } |
551 | ||
b0209501 S |
552 | /* |
553 | * vmbus interrupt flow handler: | |
554 | * vmbus interrupts can concurrently occur on multiple CPUs and | |
555 | * can be handled concurrently. | |
556 | */ | |
557 | ||
83ebf6e5 | 558 | static void vmbus_flow_handler(unsigned int irq, struct irq_desc *desc) |
b0209501 S |
559 | { |
560 | kstat_incr_irqs_this_cpu(irq, desc); | |
561 | ||
562 | desc->action->handler(irq, desc->action->dev_id); | |
563 | } | |
564 | ||
3e189519 | 565 | /* |
90c9960e GKH |
566 | * vmbus_bus_init -Main vmbus driver initialization routine. |
567 | * | |
568 | * Here, we | |
0686e4f4 | 569 | * - initialize the vmbus driver context |
0686e4f4 LL |
570 | * - invoke the vmbus hv main init routine |
571 | * - get the irq resource | |
0686e4f4 | 572 | * - retrieve the channel offers |
90c9960e | 573 | */ |
9aaa995e | 574 | static int vmbus_bus_init(int irq) |
3e7ee490 | 575 | { |
90c9960e | 576 | int ret; |
3e7ee490 | 577 | |
6d26e38f GKH |
578 | /* Hypervisor initialization...setup hypercall page..etc */ |
579 | ret = hv_init(); | |
90c9960e | 580 | if (ret != 0) { |
0a46618d | 581 | pr_err("Unable to initialize the hypervisor - 0x%x\n", ret); |
d6c1c5de | 582 | return ret; |
3e7ee490 HJ |
583 | } |
584 | ||
59c0e4f0 | 585 | tasklet_init(&msg_dpc, vmbus_on_msg_dpc, 0); |
3e7ee490 | 586 | |
9adcac5c | 587 | ret = bus_register(&hv_bus); |
d6c1c5de | 588 | if (ret) |
8b9987e9 | 589 | goto err_cleanup; |
3e7ee490 | 590 | |
20ed3ef7 | 591 | ret = request_irq(irq, vmbus_isr, 0, driver_name, hv_acpi_dev); |
3e7ee490 | 592 | |
90c9960e | 593 | if (ret != 0) { |
0a46618d | 594 | pr_err("Unable to request IRQ %d\n", |
9aaa995e | 595 | irq); |
8b9987e9 | 596 | goto err_unregister; |
3e7ee490 | 597 | } |
3e7ee490 | 598 | |
b0209501 S |
599 | /* |
600 | * Vmbus interrupts can be handled concurrently on | |
601 | * different CPUs. Establish an appropriate interrupt flow | |
602 | * handler that can support this model. | |
603 | */ | |
604 | irq_set_handler(irq, vmbus_flow_handler); | |
605 | ||
302a3c0f S |
606 | /* |
607 | * Register our interrupt handler. | |
608 | */ | |
609 | hv_register_vmbus_handler(irq, vmbus_isr); | |
3e7ee490 | 610 | |
2608fb65 JW |
611 | ret = hv_synic_alloc(); |
612 | if (ret) | |
613 | goto err_alloc; | |
800b6902 | 614 | /* |
302a3c0f | 615 | * Initialize the per-cpu interrupt state and |
800b6902 S |
616 | * connect to the host. |
617 | */ | |
302a3c0f | 618 | on_each_cpu(hv_synic_init, NULL, 1); |
800b6902 | 619 | ret = vmbus_connect(); |
8b9987e9 | 620 | if (ret) |
2608fb65 | 621 | goto err_alloc; |
800b6902 | 622 | |
2d6e882b | 623 | vmbus_request_offers(); |
8b5d6d3b | 624 | |
d6c1c5de | 625 | return 0; |
8b9987e9 | 626 | |
2608fb65 JW |
627 | err_alloc: |
628 | hv_synic_free(); | |
8b9987e9 S |
629 | free_irq(irq, hv_acpi_dev); |
630 | ||
631 | err_unregister: | |
632 | bus_unregister(&hv_bus); | |
633 | ||
634 | err_cleanup: | |
635 | hv_cleanup(); | |
636 | ||
637 | return ret; | |
3e7ee490 HJ |
638 | } |
639 | ||
90c9960e | 640 | /** |
768fa219 GKH |
641 | * __vmbus_child_driver_register - Register a vmbus's driver |
642 | * @drv: Pointer to driver structure you want to register | |
643 | * @owner: owner module of the drv | |
644 | * @mod_name: module name string | |
3e189519 HJ |
645 | * |
646 | * Registers the given driver with Linux through the 'driver_register()' call | |
768fa219 | 647 | * and sets up the hyper-v vmbus handling for this driver. |
3e189519 HJ |
648 | * It will return the state of the 'driver_register()' call. |
649 | * | |
90c9960e | 650 | */ |
768fa219 | 651 | int __vmbus_driver_register(struct hv_driver *hv_driver, struct module *owner, const char *mod_name) |
3e7ee490 | 652 | { |
5d48a1c2 | 653 | int ret; |
3e7ee490 | 654 | |
768fa219 | 655 | pr_info("registering driver %s\n", hv_driver->name); |
3e7ee490 | 656 | |
cf6a2eac S |
657 | ret = vmbus_exists(); |
658 | if (ret < 0) | |
659 | return ret; | |
660 | ||
768fa219 GKH |
661 | hv_driver->driver.name = hv_driver->name; |
662 | hv_driver->driver.owner = owner; | |
663 | hv_driver->driver.mod_name = mod_name; | |
664 | hv_driver->driver.bus = &hv_bus; | |
3e7ee490 | 665 | |
768fa219 | 666 | ret = driver_register(&hv_driver->driver); |
3e7ee490 | 667 | |
5d48a1c2 | 668 | return ret; |
3e7ee490 | 669 | } |
768fa219 | 670 | EXPORT_SYMBOL_GPL(__vmbus_driver_register); |
3e7ee490 | 671 | |
90c9960e | 672 | /** |
768fa219 GKH |
673 | * vmbus_driver_unregister() - Unregister a vmbus's driver |
674 | * @drv: Pointer to driver structure you want to un-register | |
3e189519 | 675 | * |
768fa219 GKH |
676 | * Un-register the given driver that was previous registered with a call to |
677 | * vmbus_driver_register() | |
90c9960e | 678 | */ |
768fa219 | 679 | void vmbus_driver_unregister(struct hv_driver *hv_driver) |
3e7ee490 | 680 | { |
768fa219 | 681 | pr_info("unregistering driver %s\n", hv_driver->name); |
3e7ee490 | 682 | |
cf6a2eac | 683 | if (!vmbus_exists()) |
8f257a14 | 684 | driver_unregister(&hv_driver->driver); |
3e7ee490 | 685 | } |
768fa219 | 686 | EXPORT_SYMBOL_GPL(vmbus_driver_unregister); |
3e7ee490 | 687 | |
3e189519 | 688 | /* |
f2c73011 | 689 | * vmbus_device_create - Creates and registers a new child device |
3e189519 | 690 | * on the vmbus. |
90c9960e | 691 | */ |
f2c73011 | 692 | struct hv_device *vmbus_device_create(uuid_le *type, |
358d2ee2 | 693 | uuid_le *instance, |
89733aa9 | 694 | struct vmbus_channel *channel) |
3e7ee490 | 695 | { |
3d3b5518 | 696 | struct hv_device *child_device_obj; |
3e7ee490 | 697 | |
6bad88da S |
698 | child_device_obj = kzalloc(sizeof(struct hv_device), GFP_KERNEL); |
699 | if (!child_device_obj) { | |
0a46618d | 700 | pr_err("Unable to allocate device object for child device\n"); |
3e7ee490 HJ |
701 | return NULL; |
702 | } | |
703 | ||
cae5b843 | 704 | child_device_obj->channel = channel; |
358d2ee2 | 705 | memcpy(&child_device_obj->dev_type, type, sizeof(uuid_le)); |
ca623ad3 | 706 | memcpy(&child_device_obj->dev_instance, instance, |
358d2ee2 | 707 | sizeof(uuid_le)); |
3e7ee490 | 708 | |
3e7ee490 | 709 | |
3e7ee490 HJ |
710 | return child_device_obj; |
711 | } | |
712 | ||
3e189519 | 713 | /* |
22794281 | 714 | * vmbus_device_register - Register the child device |
90c9960e | 715 | */ |
22794281 | 716 | int vmbus_device_register(struct hv_device *child_device_obj) |
3e7ee490 | 717 | { |
90c9960e | 718 | int ret = 0; |
6bad88da | 719 | |
f4888417 | 720 | static atomic_t device_num = ATOMIC_INIT(0); |
3e7ee490 | 721 | |
6bad88da | 722 | dev_set_name(&child_device_obj->device, "vmbus_0_%d", |
90c9960e | 723 | atomic_inc_return(&device_num)); |
3e7ee490 | 724 | |
0bce28b6 | 725 | child_device_obj->device.bus = &hv_bus; |
607c1a11 | 726 | child_device_obj->device.parent = &hv_acpi_dev->dev; |
6bad88da | 727 | child_device_obj->device.release = vmbus_device_release; |
3e7ee490 | 728 | |
90c9960e GKH |
729 | /* |
730 | * Register with the LDM. This will kick off the driver/device | |
731 | * binding...which will eventually call vmbus_match() and vmbus_probe() | |
732 | */ | |
6bad88da | 733 | ret = device_register(&child_device_obj->device); |
3e7ee490 | 734 | |
3e7ee490 | 735 | if (ret) |
0a46618d | 736 | pr_err("Unable to register child device\n"); |
3e7ee490 | 737 | else |
84672369 | 738 | pr_debug("child device %s registered\n", |
0a46618d | 739 | dev_name(&child_device_obj->device)); |
3e7ee490 | 740 | |
3e7ee490 HJ |
741 | return ret; |
742 | } | |
743 | ||
3e189519 | 744 | /* |
696453ba | 745 | * vmbus_device_unregister - Remove the specified child device |
3e189519 | 746 | * from the vmbus. |
90c9960e | 747 | */ |
696453ba | 748 | void vmbus_device_unregister(struct hv_device *device_obj) |
3e7ee490 | 749 | { |
84672369 FS |
750 | pr_debug("child device %s unregistered\n", |
751 | dev_name(&device_obj->device)); | |
752 | ||
90c9960e GKH |
753 | /* |
754 | * Kick off the process of unregistering the device. | |
755 | * This will call vmbus_remove() and eventually vmbus_device_release() | |
756 | */ | |
6bad88da | 757 | device_unregister(&device_obj->device); |
3e7ee490 HJ |
758 | } |
759 | ||
3e7ee490 | 760 | |
b0069f43 S |
761 | /* |
762 | * VMBUS is an acpi enumerated device. Get the the IRQ information | |
763 | * from DSDT. | |
764 | */ | |
765 | ||
766 | static acpi_status vmbus_walk_resources(struct acpi_resource *res, void *irq) | |
767 | { | |
768 | ||
769 | if (res->type == ACPI_RESOURCE_TYPE_IRQ) { | |
770 | struct acpi_resource_irq *irqp; | |
771 | irqp = &res->data.irq; | |
772 | ||
773 | *((unsigned int *)irq) = irqp->interrupts[0]; | |
774 | } | |
775 | ||
776 | return AE_OK; | |
777 | } | |
778 | ||
779 | static int vmbus_acpi_add(struct acpi_device *device) | |
780 | { | |
781 | acpi_status result; | |
782 | ||
607c1a11 S |
783 | hv_acpi_dev = device; |
784 | ||
0a4425b6 S |
785 | result = acpi_walk_resources(device->handle, METHOD_NAME__CRS, |
786 | vmbus_walk_resources, &irq); | |
b0069f43 S |
787 | |
788 | if (ACPI_FAILURE(result)) { | |
789 | complete(&probe_event); | |
790 | return -ENODEV; | |
791 | } | |
792 | complete(&probe_event); | |
793 | return 0; | |
794 | } | |
795 | ||
796 | static const struct acpi_device_id vmbus_acpi_device_ids[] = { | |
797 | {"VMBUS", 0}, | |
9d7b18d1 | 798 | {"VMBus", 0}, |
b0069f43 S |
799 | {"", 0}, |
800 | }; | |
801 | MODULE_DEVICE_TABLE(acpi, vmbus_acpi_device_ids); | |
802 | ||
803 | static struct acpi_driver vmbus_acpi_driver = { | |
804 | .name = "vmbus", | |
805 | .ids = vmbus_acpi_device_ids, | |
806 | .ops = { | |
807 | .add = vmbus_acpi_add, | |
808 | }, | |
809 | }; | |
810 | ||
607c1a11 | 811 | static int __init hv_acpi_init(void) |
1168ac22 | 812 | { |
2dda95f8 | 813 | int ret, t; |
b0069f43 | 814 | |
1f94ea81 | 815 | if (x86_hyper != &x86_hyper_ms_hyperv) |
0592969e JW |
816 | return -ENODEV; |
817 | ||
b0069f43 S |
818 | init_completion(&probe_event); |
819 | ||
820 | /* | |
821 | * Get irq resources first. | |
822 | */ | |
823 | ||
0246604c S |
824 | ret = acpi_bus_register_driver(&vmbus_acpi_driver); |
825 | ||
b0069f43 S |
826 | if (ret) |
827 | return ret; | |
828 | ||
2dda95f8 S |
829 | t = wait_for_completion_timeout(&probe_event, 5*HZ); |
830 | if (t == 0) { | |
831 | ret = -ETIMEDOUT; | |
832 | goto cleanup; | |
833 | } | |
b0069f43 S |
834 | |
835 | if (irq <= 0) { | |
2dda95f8 S |
836 | ret = -ENODEV; |
837 | goto cleanup; | |
b0069f43 S |
838 | } |
839 | ||
91fd799e S |
840 | ret = vmbus_bus_init(irq); |
841 | if (ret) | |
2dda95f8 S |
842 | goto cleanup; |
843 | ||
844 | return 0; | |
845 | ||
846 | cleanup: | |
847 | acpi_bus_unregister_driver(&vmbus_acpi_driver); | |
cf6a2eac | 848 | hv_acpi_dev = NULL; |
91fd799e | 849 | return ret; |
1168ac22 S |
850 | } |
851 | ||
93e5bd06 S |
852 | static void __exit vmbus_exit(void) |
853 | { | |
854 | ||
855 | free_irq(irq, hv_acpi_dev); | |
856 | vmbus_free_channels(); | |
857 | bus_unregister(&hv_bus); | |
858 | hv_cleanup(); | |
859 | acpi_bus_unregister_driver(&vmbus_acpi_driver); | |
860 | } | |
861 | ||
1168ac22 | 862 | |
90c9960e | 863 | MODULE_LICENSE("GPL"); |
3e7ee490 | 864 | |
43d4e119 | 865 | subsys_initcall(hv_acpi_init); |
93e5bd06 | 866 | module_exit(vmbus_exit); |