]>
Commit | Line | Data |
---|---|---|
3e7ee490 | 1 | /* |
3e7ee490 HJ |
2 | * Copyright (c) 2009, Microsoft Corporation. |
3 | * | |
4 | * This program is free software; you can redistribute it and/or modify it | |
5 | * under the terms and conditions of the GNU General Public License, | |
6 | * version 2, as published by the Free Software Foundation. | |
7 | * | |
8 | * This program is distributed in the hope it will be useful, but WITHOUT | |
9 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
10 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for | |
11 | * more details. | |
12 | * | |
13 | * You should have received a copy of the GNU General Public License along with | |
14 | * this program; if not, write to the Free Software Foundation, Inc., 59 Temple | |
15 | * Place - Suite 330, Boston, MA 02111-1307 USA. | |
16 | * | |
17 | * Authors: | |
18 | * Haiyang Zhang <haiyangz@microsoft.com> | |
19 | * Hank Janssen <hjanssen@microsoft.com> | |
b0069f43 | 20 | * K. Y. Srinivasan <kys@microsoft.com> |
52e5c1ce | 21 | * |
3e7ee490 | 22 | */ |
0a46618d HJ |
23 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
24 | ||
3e7ee490 HJ |
25 | #include <linux/init.h> |
26 | #include <linux/module.h> | |
27 | #include <linux/device.h> | |
28 | #include <linux/irq.h> | |
29 | #include <linux/interrupt.h> | |
30 | #include <linux/sysctl.h> | |
5a0e3ad6 | 31 | #include <linux/slab.h> |
b0069f43 S |
32 | #include <linux/acpi.h> |
33 | #include <acpi/acpi_bus.h> | |
8b5d6d3b | 34 | #include <linux/completion.h> |
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 | 50 | u32 server_monitor_conn_id; |
15b80d64 GKH |
51 | u32 client_monitor_conn_id; |
52 | ||
53 | struct hv_dev_port_info inbound; | |
54 | struct hv_dev_port_info outbound; | |
55 | }; | |
56 | ||
cf6a2eac S |
57 | static int vmbus_exists(void) |
58 | { | |
59 | if (hv_acpi_dev == NULL) | |
60 | return -ENODEV; | |
61 | ||
62 | return 0; | |
63 | } | |
64 | ||
15b80d64 | 65 | |
98db4335 S |
66 | static void get_channel_info(struct hv_device *device, |
67 | struct hv_device_info *info) | |
68 | { | |
69 | struct vmbus_channel_debug_info debug_info; | |
70 | ||
71 | if (!device->channel) | |
72 | return; | |
73 | ||
74 | vmbus_get_debug_info(device->channel, &debug_info); | |
75 | ||
98db4335 S |
76 | info->server_monitor_conn_id = debug_info.servermonitor_connectionid; |
77 | ||
98db4335 S |
78 | info->client_monitor_conn_id = debug_info.clientmonitor_connectionid; |
79 | ||
80 | info->inbound.int_mask = debug_info.inbound.current_interrupt_mask; | |
81 | info->inbound.read_idx = debug_info.inbound.current_read_index; | |
82 | info->inbound.write_idx = debug_info.inbound.current_write_index; | |
83 | info->inbound.bytes_avail_toread = | |
84 | debug_info.inbound.bytes_avail_toread; | |
85 | info->inbound.bytes_avail_towrite = | |
86 | debug_info.inbound.bytes_avail_towrite; | |
3e7ee490 | 87 | |
98db4335 S |
88 | info->outbound.int_mask = |
89 | debug_info.outbound.current_interrupt_mask; | |
90 | info->outbound.read_idx = debug_info.outbound.current_read_index; | |
91 | info->outbound.write_idx = debug_info.outbound.current_write_index; | |
92 | info->outbound.bytes_avail_toread = | |
93 | debug_info.outbound.bytes_avail_toread; | |
94 | info->outbound.bytes_avail_towrite = | |
95 | debug_info.outbound.bytes_avail_towrite; | |
96 | } | |
3e7ee490 | 97 | |
fd776ba9 OH |
98 | #define VMBUS_ALIAS_LEN ((sizeof((struct hv_vmbus_device_id *)0)->guid) * 2) |
99 | static void print_alias_name(struct hv_device *hv_dev, char *alias_name) | |
100 | { | |
101 | int i; | |
102 | for (i = 0; i < VMBUS_ALIAS_LEN; i += 2) | |
103 | sprintf(&alias_name[i], "%02x", hv_dev->dev_type.b[i/2]); | |
104 | } | |
105 | ||
98db4335 S |
106 | /* |
107 | * vmbus_show_device_attr - Show the device attribute in sysfs. | |
108 | * | |
109 | * This is invoked when user does a | |
110 | * "cat /sys/bus/vmbus/devices/<busdevice>/<attr name>" | |
111 | */ | |
90c9960e GKH |
112 | static ssize_t vmbus_show_device_attr(struct device *dev, |
113 | struct device_attribute *dev_attr, | |
98db4335 S |
114 | char *buf) |
115 | { | |
e8e27047 | 116 | struct hv_device *hv_dev = device_to_hv_device(dev); |
7bb52384 | 117 | struct hv_device_info *device_info; |
7bb52384 | 118 | int ret = 0; |
3e7ee490 | 119 | |
7bb52384 S |
120 | device_info = kzalloc(sizeof(struct hv_device_info), GFP_KERNEL); |
121 | if (!device_info) | |
122 | return ret; | |
3e7ee490 | 123 | |
7bb52384 | 124 | get_channel_info(hv_dev, device_info); |
3e7ee490 | 125 | |
7c55e1d0 | 126 | if (!strcmp(dev_attr->attr.name, "out_intr_mask")) { |
7bb52384 | 127 | ret = sprintf(buf, "%d\n", device_info->outbound.int_mask); |
98db4335 | 128 | } else if (!strcmp(dev_attr->attr.name, "out_read_index")) { |
7bb52384 | 129 | ret = sprintf(buf, "%d\n", device_info->outbound.read_idx); |
98db4335 | 130 | } else if (!strcmp(dev_attr->attr.name, "out_write_index")) { |
7bb52384 | 131 | ret = sprintf(buf, "%d\n", device_info->outbound.write_idx); |
98db4335 | 132 | } else if (!strcmp(dev_attr->attr.name, "out_read_bytes_avail")) { |
7bb52384 S |
133 | ret = sprintf(buf, "%d\n", |
134 | device_info->outbound.bytes_avail_toread); | |
98db4335 | 135 | } else if (!strcmp(dev_attr->attr.name, "out_write_bytes_avail")) { |
7bb52384 S |
136 | ret = sprintf(buf, "%d\n", |
137 | device_info->outbound.bytes_avail_towrite); | |
98db4335 | 138 | } else if (!strcmp(dev_attr->attr.name, "in_intr_mask")) { |
7bb52384 | 139 | ret = sprintf(buf, "%d\n", device_info->inbound.int_mask); |
98db4335 | 140 | } else if (!strcmp(dev_attr->attr.name, "in_read_index")) { |
7bb52384 | 141 | ret = sprintf(buf, "%d\n", device_info->inbound.read_idx); |
98db4335 | 142 | } else if (!strcmp(dev_attr->attr.name, "in_write_index")) { |
7bb52384 | 143 | ret = sprintf(buf, "%d\n", device_info->inbound.write_idx); |
98db4335 | 144 | } else if (!strcmp(dev_attr->attr.name, "in_read_bytes_avail")) { |
7bb52384 S |
145 | ret = sprintf(buf, "%d\n", |
146 | device_info->inbound.bytes_avail_toread); | |
98db4335 | 147 | } else if (!strcmp(dev_attr->attr.name, "in_write_bytes_avail")) { |
7bb52384 S |
148 | ret = sprintf(buf, "%d\n", |
149 | device_info->inbound.bytes_avail_towrite); | |
98db4335 | 150 | } else if (!strcmp(dev_attr->attr.name, "server_monitor_conn_id")) { |
7bb52384 S |
151 | ret = sprintf(buf, "%d\n", |
152 | device_info->server_monitor_conn_id); | |
98db4335 | 153 | } else if (!strcmp(dev_attr->attr.name, "client_monitor_conn_id")) { |
7bb52384 S |
154 | ret = sprintf(buf, "%d\n", |
155 | device_info->client_monitor_conn_id); | |
98db4335 | 156 | } |
7bb52384 S |
157 | |
158 | kfree(device_info); | |
159 | return ret; | |
98db4335 | 160 | } |
3e7ee490 | 161 | |
76c52bbe GKH |
162 | static u8 channel_monitor_group(struct vmbus_channel *channel) |
163 | { | |
164 | return (u8)channel->offermsg.monitorid / 32; | |
165 | } | |
166 | ||
167 | static u8 channel_monitor_offset(struct vmbus_channel *channel) | |
168 | { | |
169 | return (u8)channel->offermsg.monitorid % 32; | |
170 | } | |
171 | ||
172 | static u32 channel_pending(struct vmbus_channel *channel, | |
173 | struct hv_monitor_page *monitor_page) | |
174 | { | |
175 | u8 monitor_group = channel_monitor_group(channel); | |
176 | return monitor_page->trigger_group[monitor_group].pending; | |
177 | } | |
178 | ||
1cee272b GKH |
179 | static u32 channel_latency(struct vmbus_channel *channel, |
180 | struct hv_monitor_page *monitor_page) | |
181 | { | |
182 | u8 monitor_group = channel_monitor_group(channel); | |
183 | u8 monitor_offset = channel_monitor_offset(channel); | |
184 | return monitor_page->latency[monitor_group][monitor_offset]; | |
185 | } | |
186 | ||
03f3a910 GKH |
187 | static ssize_t id_show(struct device *dev, struct device_attribute *dev_attr, |
188 | char *buf) | |
189 | { | |
190 | struct hv_device *hv_dev = device_to_hv_device(dev); | |
191 | ||
192 | if (!hv_dev->channel) | |
193 | return -ENODEV; | |
194 | return sprintf(buf, "%d\n", hv_dev->channel->offermsg.child_relid); | |
195 | } | |
196 | static DEVICE_ATTR_RO(id); | |
197 | ||
a8fb5f3d GKH |
198 | static ssize_t state_show(struct device *dev, struct device_attribute *dev_attr, |
199 | char *buf) | |
200 | { | |
201 | struct hv_device *hv_dev = device_to_hv_device(dev); | |
202 | ||
203 | if (!hv_dev->channel) | |
204 | return -ENODEV; | |
205 | return sprintf(buf, "%d\n", hv_dev->channel->state); | |
206 | } | |
207 | static DEVICE_ATTR_RO(state); | |
208 | ||
5ffd00e2 GKH |
209 | static ssize_t monitor_id_show(struct device *dev, |
210 | struct device_attribute *dev_attr, char *buf) | |
211 | { | |
212 | struct hv_device *hv_dev = device_to_hv_device(dev); | |
213 | ||
214 | if (!hv_dev->channel) | |
215 | return -ENODEV; | |
216 | return sprintf(buf, "%d\n", hv_dev->channel->offermsg.monitorid); | |
217 | } | |
218 | static DEVICE_ATTR_RO(monitor_id); | |
219 | ||
68234c04 GKH |
220 | static ssize_t class_id_show(struct device *dev, |
221 | struct device_attribute *dev_attr, char *buf) | |
222 | { | |
223 | struct hv_device *hv_dev = device_to_hv_device(dev); | |
224 | ||
225 | if (!hv_dev->channel) | |
226 | return -ENODEV; | |
227 | return sprintf(buf, "{%pUl}\n", | |
228 | hv_dev->channel->offermsg.offer.if_type.b); | |
229 | } | |
230 | static DEVICE_ATTR_RO(class_id); | |
231 | ||
7c55e1d0 GKH |
232 | static ssize_t device_id_show(struct device *dev, |
233 | struct device_attribute *dev_attr, char *buf) | |
234 | { | |
235 | struct hv_device *hv_dev = device_to_hv_device(dev); | |
236 | ||
237 | if (!hv_dev->channel) | |
238 | return -ENODEV; | |
239 | return sprintf(buf, "{%pUl}\n", | |
240 | hv_dev->channel->offermsg.offer.if_instance.b); | |
241 | } | |
242 | static DEVICE_ATTR_RO(device_id); | |
243 | ||
647fa371 GKH |
244 | static ssize_t modalias_show(struct device *dev, |
245 | struct device_attribute *dev_attr, char *buf) | |
246 | { | |
247 | struct hv_device *hv_dev = device_to_hv_device(dev); | |
248 | char alias_name[VMBUS_ALIAS_LEN + 1]; | |
249 | ||
250 | print_alias_name(hv_dev, alias_name); | |
251 | return sprintf(buf, "vmbus:%s\n", alias_name); | |
252 | } | |
253 | static DEVICE_ATTR_RO(modalias); | |
254 | ||
76c52bbe GKH |
255 | static ssize_t server_monitor_pending_show(struct device *dev, |
256 | struct device_attribute *dev_attr, | |
257 | char *buf) | |
258 | { | |
259 | struct hv_device *hv_dev = device_to_hv_device(dev); | |
260 | ||
261 | if (!hv_dev->channel) | |
262 | return -ENODEV; | |
263 | return sprintf(buf, "%d\n", | |
264 | channel_pending(hv_dev->channel, | |
265 | vmbus_connection.monitor_pages[1])); | |
266 | } | |
267 | static DEVICE_ATTR_RO(server_monitor_pending); | |
268 | ||
269 | static ssize_t client_monitor_pending_show(struct device *dev, | |
270 | struct device_attribute *dev_attr, | |
271 | char *buf) | |
272 | { | |
273 | struct hv_device *hv_dev = device_to_hv_device(dev); | |
274 | ||
275 | if (!hv_dev->channel) | |
276 | return -ENODEV; | |
277 | return sprintf(buf, "%d\n", | |
278 | channel_pending(hv_dev->channel, | |
279 | vmbus_connection.monitor_pages[1])); | |
280 | } | |
281 | static DEVICE_ATTR_RO(client_monitor_pending); | |
68234c04 | 282 | |
1cee272b GKH |
283 | static ssize_t server_monitor_latency_show(struct device *dev, |
284 | struct device_attribute *dev_attr, | |
285 | char *buf) | |
286 | { | |
287 | struct hv_device *hv_dev = device_to_hv_device(dev); | |
288 | ||
289 | if (!hv_dev->channel) | |
290 | return -ENODEV; | |
291 | return sprintf(buf, "%d\n", | |
292 | channel_latency(hv_dev->channel, | |
293 | vmbus_connection.monitor_pages[0])); | |
294 | } | |
295 | static DEVICE_ATTR_RO(server_monitor_latency); | |
296 | ||
297 | static ssize_t client_monitor_latency_show(struct device *dev, | |
298 | struct device_attribute *dev_attr, | |
299 | char *buf) | |
300 | { | |
301 | struct hv_device *hv_dev = device_to_hv_device(dev); | |
302 | ||
303 | if (!hv_dev->channel) | |
304 | return -ENODEV; | |
305 | return sprintf(buf, "%d\n", | |
306 | channel_latency(hv_dev->channel, | |
307 | vmbus_connection.monitor_pages[1])); | |
308 | } | |
309 | static DEVICE_ATTR_RO(client_monitor_latency); | |
310 | ||
03f3a910 GKH |
311 | static struct attribute *vmbus_attrs[] = { |
312 | &dev_attr_id.attr, | |
a8fb5f3d | 313 | &dev_attr_state.attr, |
5ffd00e2 | 314 | &dev_attr_monitor_id.attr, |
68234c04 | 315 | &dev_attr_class_id.attr, |
7c55e1d0 | 316 | &dev_attr_device_id.attr, |
647fa371 | 317 | &dev_attr_modalias.attr, |
76c52bbe GKH |
318 | &dev_attr_server_monitor_pending.attr, |
319 | &dev_attr_client_monitor_pending.attr, | |
1cee272b GKH |
320 | &dev_attr_server_monitor_latency.attr, |
321 | &dev_attr_client_monitor_latency.attr, | |
03f3a910 GKH |
322 | NULL, |
323 | }; | |
324 | ATTRIBUTE_GROUPS(vmbus); | |
325 | ||
454f18a9 | 326 | /* Set up per device attributes in /sys/bus/vmbus/devices/<bus device> */ |
3e7ee490 | 327 | static struct device_attribute vmbus_device_attrs[] = { |
3e7ee490 HJ |
328 | __ATTR(server_monitor_conn_id, S_IRUGO, vmbus_show_device_attr, NULL), |
329 | ||
3e7ee490 HJ |
330 | __ATTR(client_monitor_conn_id, S_IRUGO, vmbus_show_device_attr, NULL), |
331 | ||
332 | __ATTR(out_intr_mask, S_IRUGO, vmbus_show_device_attr, NULL), | |
333 | __ATTR(out_read_index, S_IRUGO, vmbus_show_device_attr, NULL), | |
334 | __ATTR(out_write_index, S_IRUGO, vmbus_show_device_attr, NULL), | |
335 | __ATTR(out_read_bytes_avail, S_IRUGO, vmbus_show_device_attr, NULL), | |
336 | __ATTR(out_write_bytes_avail, S_IRUGO, vmbus_show_device_attr, NULL), | |
337 | ||
338 | __ATTR(in_intr_mask, S_IRUGO, vmbus_show_device_attr, NULL), | |
339 | __ATTR(in_read_index, S_IRUGO, vmbus_show_device_attr, NULL), | |
340 | __ATTR(in_write_index, S_IRUGO, vmbus_show_device_attr, NULL), | |
341 | __ATTR(in_read_bytes_avail, S_IRUGO, vmbus_show_device_attr, NULL), | |
342 | __ATTR(in_write_bytes_avail, S_IRUGO, vmbus_show_device_attr, NULL), | |
343 | __ATTR_NULL | |
344 | }; | |
3e7ee490 | 345 | |
793be9c7 | 346 | |
adde2487 S |
347 | /* |
348 | * vmbus_uevent - add uevent for our device | |
349 | * | |
350 | * This routine is invoked when a device is added or removed on the vmbus to | |
351 | * generate a uevent to udev in the userspace. The udev will then look at its | |
352 | * rule and the uevent generated here to load the appropriate driver | |
0ddda660 S |
353 | * |
354 | * The alias string will be of the form vmbus:guid where guid is the string | |
355 | * representation of the device guid (each byte of the guid will be | |
356 | * represented with two hex characters. | |
adde2487 S |
357 | */ |
358 | static int vmbus_uevent(struct device *device, struct kobj_uevent_env *env) | |
359 | { | |
360 | struct hv_device *dev = device_to_hv_device(device); | |
fd776ba9 OH |
361 | int ret; |
362 | char alias_name[VMBUS_ALIAS_LEN + 1]; | |
0ddda660 | 363 | |
fd776ba9 | 364 | print_alias_name(dev, alias_name); |
0ddda660 S |
365 | ret = add_uevent_var(env, "MODALIAS=vmbus:%s", alias_name); |
366 | return ret; | |
adde2487 S |
367 | } |
368 | ||
5841a829 S |
369 | static uuid_le null_guid; |
370 | ||
371 | static inline bool is_null_guid(const __u8 *guid) | |
372 | { | |
373 | if (memcmp(guid, &null_guid, sizeof(uuid_le))) | |
374 | return false; | |
375 | return true; | |
376 | } | |
377 | ||
3037a7b6 S |
378 | /* |
379 | * Return a matching hv_vmbus_device_id pointer. | |
380 | * If there is no match, return NULL. | |
381 | */ | |
382 | static const struct hv_vmbus_device_id *hv_vmbus_get_id( | |
383 | const struct hv_vmbus_device_id *id, | |
384 | __u8 *guid) | |
385 | { | |
386 | for (; !is_null_guid(id->guid); id++) | |
387 | if (!memcmp(&id->guid, guid, sizeof(uuid_le))) | |
388 | return id; | |
389 | ||
390 | return NULL; | |
391 | } | |
392 | ||
393 | ||
b7fc147b S |
394 | |
395 | /* | |
396 | * vmbus_match - Attempt to match the specified device to the specified driver | |
397 | */ | |
398 | static int vmbus_match(struct device *device, struct device_driver *driver) | |
399 | { | |
b7fc147b | 400 | struct hv_driver *drv = drv_to_hv_drv(driver); |
e8e27047 | 401 | struct hv_device *hv_dev = device_to_hv_device(device); |
b7fc147b | 402 | |
3037a7b6 S |
403 | if (hv_vmbus_get_id(drv->id_table, hv_dev->dev_type.b)) |
404 | return 1; | |
de632a2b | 405 | |
5841a829 | 406 | return 0; |
b7fc147b S |
407 | } |
408 | ||
f1f0d67b S |
409 | /* |
410 | * vmbus_probe - Add the new vmbus's child device | |
411 | */ | |
412 | static int vmbus_probe(struct device *child_device) | |
413 | { | |
414 | int ret = 0; | |
415 | struct hv_driver *drv = | |
416 | drv_to_hv_drv(child_device->driver); | |
9efd21e1 | 417 | struct hv_device *dev = device_to_hv_device(child_device); |
84946899 | 418 | const struct hv_vmbus_device_id *dev_id; |
f1f0d67b | 419 | |
84946899 | 420 | dev_id = hv_vmbus_get_id(drv->id_table, dev->dev_type.b); |
9efd21e1 | 421 | if (drv->probe) { |
84946899 | 422 | ret = drv->probe(dev, dev_id); |
b14a7b30 | 423 | if (ret != 0) |
0a46618d HJ |
424 | pr_err("probe failed for device %s (%d)\n", |
425 | dev_name(child_device), ret); | |
f1f0d67b | 426 | |
f1f0d67b | 427 | } else { |
0a46618d HJ |
428 | pr_err("probe not set for driver %s\n", |
429 | dev_name(child_device)); | |
6de925b1 | 430 | ret = -ENODEV; |
f1f0d67b S |
431 | } |
432 | return ret; | |
433 | } | |
434 | ||
c5dce3db S |
435 | /* |
436 | * vmbus_remove - Remove a vmbus device | |
437 | */ | |
438 | static int vmbus_remove(struct device *child_device) | |
439 | { | |
d4372179 | 440 | struct hv_driver *drv = drv_to_hv_drv(child_device->driver); |
415b023a | 441 | struct hv_device *dev = device_to_hv_device(child_device); |
c5dce3db | 442 | |
d4372179 S |
443 | if (drv->remove) |
444 | drv->remove(dev); | |
445 | else | |
446 | pr_err("remove not set for driver %s\n", | |
447 | dev_name(child_device)); | |
c5dce3db S |
448 | |
449 | return 0; | |
450 | } | |
451 | ||
eb1bb259 S |
452 | |
453 | /* | |
454 | * vmbus_shutdown - Shutdown a vmbus device | |
455 | */ | |
456 | static void vmbus_shutdown(struct device *child_device) | |
457 | { | |
458 | struct hv_driver *drv; | |
ca6887fb | 459 | struct hv_device *dev = device_to_hv_device(child_device); |
eb1bb259 S |
460 | |
461 | ||
462 | /* The device may not be attached yet */ | |
463 | if (!child_device->driver) | |
464 | return; | |
465 | ||
466 | drv = drv_to_hv_drv(child_device->driver); | |
467 | ||
ca6887fb S |
468 | if (drv->shutdown) |
469 | drv->shutdown(dev); | |
eb1bb259 S |
470 | |
471 | return; | |
472 | } | |
473 | ||
086e7a56 S |
474 | |
475 | /* | |
476 | * vmbus_device_release - Final callback release of the vmbus child device | |
477 | */ | |
478 | static void vmbus_device_release(struct device *device) | |
479 | { | |
e8e27047 | 480 | struct hv_device *hv_dev = device_to_hv_device(device); |
086e7a56 | 481 | |
e8e27047 | 482 | kfree(hv_dev); |
086e7a56 S |
483 | |
484 | } | |
485 | ||
454f18a9 | 486 | /* The one and only one */ |
9adcac5c S |
487 | static struct bus_type hv_bus = { |
488 | .name = "vmbus", | |
489 | .match = vmbus_match, | |
490 | .shutdown = vmbus_shutdown, | |
491 | .remove = vmbus_remove, | |
492 | .probe = vmbus_probe, | |
493 | .uevent = vmbus_uevent, | |
494 | .dev_attrs = vmbus_device_attrs, | |
03f3a910 | 495 | .dev_groups = vmbus_groups, |
3e7ee490 HJ |
496 | }; |
497 | ||
adf874cb | 498 | static const char *driver_name = "hyperv"; |
36199a99 | 499 | |
36199a99 | 500 | |
bf6506f6 TT |
501 | struct onmessage_work_context { |
502 | struct work_struct work; | |
503 | struct hv_message msg; | |
504 | }; | |
505 | ||
506 | static void vmbus_onmessage_work(struct work_struct *work) | |
507 | { | |
508 | struct onmessage_work_context *ctx; | |
509 | ||
510 | ctx = container_of(work, struct onmessage_work_context, | |
511 | work); | |
512 | vmbus_onmessage(&ctx->msg); | |
513 | kfree(ctx); | |
514 | } | |
515 | ||
62c1059d | 516 | static void vmbus_on_msg_dpc(unsigned long data) |
36199a99 GKH |
517 | { |
518 | int cpu = smp_processor_id(); | |
519 | void *page_addr = hv_context.synic_message_page[cpu]; | |
520 | struct hv_message *msg = (struct hv_message *)page_addr + | |
521 | VMBUS_MESSAGE_SINT; | |
bf6506f6 | 522 | struct onmessage_work_context *ctx; |
36199a99 GKH |
523 | |
524 | while (1) { | |
525 | if (msg->header.message_type == HVMSG_NONE) { | |
526 | /* no msg */ | |
527 | break; | |
528 | } else { | |
bf6506f6 TT |
529 | ctx = kmalloc(sizeof(*ctx), GFP_ATOMIC); |
530 | if (ctx == NULL) | |
36199a99 | 531 | continue; |
bf6506f6 TT |
532 | INIT_WORK(&ctx->work, vmbus_onmessage_work); |
533 | memcpy(&ctx->msg, msg, sizeof(*msg)); | |
da9fcb72 | 534 | queue_work(vmbus_connection.work_queue, &ctx->work); |
36199a99 GKH |
535 | } |
536 | ||
537 | msg->header.message_type = HVMSG_NONE; | |
538 | ||
539 | /* | |
540 | * Make sure the write to MessageType (ie set to | |
541 | * HVMSG_NONE) happens before we read the | |
542 | * MessagePending and EOMing. Otherwise, the EOMing | |
543 | * will not deliver any more messages since there is | |
544 | * no empty slot | |
545 | */ | |
35848f68 | 546 | mb(); |
36199a99 GKH |
547 | |
548 | if (msg->header.message_flags.msg_pending) { | |
549 | /* | |
550 | * This will cause message queue rescan to | |
551 | * possibly deliver another msg from the | |
552 | * hypervisor | |
553 | */ | |
554 | wrmsrl(HV_X64_MSR_EOM, 0); | |
555 | } | |
556 | } | |
557 | } | |
558 | ||
ae4636e6 | 559 | static irqreturn_t vmbus_isr(int irq, void *dev_id) |
36199a99 | 560 | { |
36199a99 GKH |
561 | int cpu = smp_processor_id(); |
562 | void *page_addr; | |
563 | struct hv_message *msg; | |
564 | union hv_synic_event_flags *event; | |
ae4636e6 | 565 | bool handled = false; |
36199a99 | 566 | |
5ab05951 S |
567 | page_addr = hv_context.synic_event_page[cpu]; |
568 | if (page_addr == NULL) | |
569 | return IRQ_NONE; | |
570 | ||
571 | event = (union hv_synic_event_flags *)page_addr + | |
572 | VMBUS_MESSAGE_SINT; | |
7341d908 S |
573 | /* |
574 | * Check for events before checking for messages. This is the order | |
575 | * in which events and messages are checked in Windows guests on | |
576 | * Hyper-V, and the Windows team suggested we do the same. | |
577 | */ | |
36199a99 | 578 | |
6552ecd7 S |
579 | if ((vmbus_proto_version == VERSION_WS2008) || |
580 | (vmbus_proto_version == VERSION_WIN7)) { | |
36199a99 | 581 | |
6552ecd7 S |
582 | /* Since we are a child, we only need to check bit 0 */ |
583 | if (sync_test_and_clear_bit(0, | |
584 | (unsigned long *) &event->flags32[0])) { | |
585 | handled = true; | |
586 | } | |
587 | } else { | |
588 | /* | |
589 | * Our host is win8 or above. The signaling mechanism | |
590 | * has changed and we can directly look at the event page. | |
591 | * If bit n is set then we have an interrup on the channel | |
592 | * whose id is n. | |
593 | */ | |
ae4636e6 | 594 | handled = true; |
ae4636e6 | 595 | } |
793be9c7 | 596 | |
6552ecd7 | 597 | if (handled) |
db11f12a | 598 | tasklet_schedule(hv_context.event_dpc[cpu]); |
6552ecd7 S |
599 | |
600 | ||
7341d908 S |
601 | page_addr = hv_context.synic_message_page[cpu]; |
602 | msg = (struct hv_message *)page_addr + VMBUS_MESSAGE_SINT; | |
603 | ||
604 | /* Check if there are actual msgs to be processed */ | |
605 | if (msg->header.message_type != HVMSG_NONE) { | |
606 | handled = true; | |
607 | tasklet_schedule(&msg_dpc); | |
608 | } | |
609 | ||
ae4636e6 | 610 | if (handled) |
793be9c7 | 611 | return IRQ_HANDLED; |
ae4636e6 | 612 | else |
793be9c7 | 613 | return IRQ_NONE; |
793be9c7 S |
614 | } |
615 | ||
b0209501 S |
616 | /* |
617 | * vmbus interrupt flow handler: | |
618 | * vmbus interrupts can concurrently occur on multiple CPUs and | |
619 | * can be handled concurrently. | |
620 | */ | |
621 | ||
83ebf6e5 | 622 | static void vmbus_flow_handler(unsigned int irq, struct irq_desc *desc) |
b0209501 S |
623 | { |
624 | kstat_incr_irqs_this_cpu(irq, desc); | |
625 | ||
626 | desc->action->handler(irq, desc->action->dev_id); | |
627 | } | |
628 | ||
3e189519 | 629 | /* |
90c9960e GKH |
630 | * vmbus_bus_init -Main vmbus driver initialization routine. |
631 | * | |
632 | * Here, we | |
0686e4f4 | 633 | * - initialize the vmbus driver context |
0686e4f4 LL |
634 | * - invoke the vmbus hv main init routine |
635 | * - get the irq resource | |
0686e4f4 | 636 | * - retrieve the channel offers |
90c9960e | 637 | */ |
9aaa995e | 638 | static int vmbus_bus_init(int irq) |
3e7ee490 | 639 | { |
90c9960e | 640 | int ret; |
3e7ee490 | 641 | |
6d26e38f GKH |
642 | /* Hypervisor initialization...setup hypercall page..etc */ |
643 | ret = hv_init(); | |
90c9960e | 644 | if (ret != 0) { |
0a46618d | 645 | pr_err("Unable to initialize the hypervisor - 0x%x\n", ret); |
d6c1c5de | 646 | return ret; |
3e7ee490 HJ |
647 | } |
648 | ||
59c0e4f0 | 649 | tasklet_init(&msg_dpc, vmbus_on_msg_dpc, 0); |
3e7ee490 | 650 | |
9adcac5c | 651 | ret = bus_register(&hv_bus); |
d6c1c5de | 652 | if (ret) |
8b9987e9 | 653 | goto err_cleanup; |
3e7ee490 | 654 | |
20ed3ef7 | 655 | ret = request_irq(irq, vmbus_isr, 0, driver_name, hv_acpi_dev); |
3e7ee490 | 656 | |
90c9960e | 657 | if (ret != 0) { |
0a46618d | 658 | pr_err("Unable to request IRQ %d\n", |
9aaa995e | 659 | irq); |
8b9987e9 | 660 | goto err_unregister; |
3e7ee490 | 661 | } |
3e7ee490 | 662 | |
b0209501 S |
663 | /* |
664 | * Vmbus interrupts can be handled concurrently on | |
665 | * different CPUs. Establish an appropriate interrupt flow | |
666 | * handler that can support this model. | |
667 | */ | |
668 | irq_set_handler(irq, vmbus_flow_handler); | |
669 | ||
302a3c0f S |
670 | /* |
671 | * Register our interrupt handler. | |
672 | */ | |
673 | hv_register_vmbus_handler(irq, vmbus_isr); | |
3e7ee490 | 674 | |
2608fb65 JW |
675 | ret = hv_synic_alloc(); |
676 | if (ret) | |
677 | goto err_alloc; | |
800b6902 | 678 | /* |
302a3c0f | 679 | * Initialize the per-cpu interrupt state and |
800b6902 S |
680 | * connect to the host. |
681 | */ | |
302a3c0f | 682 | on_each_cpu(hv_synic_init, NULL, 1); |
800b6902 | 683 | ret = vmbus_connect(); |
8b9987e9 | 684 | if (ret) |
2608fb65 | 685 | goto err_alloc; |
800b6902 | 686 | |
2d6e882b | 687 | vmbus_request_offers(); |
8b5d6d3b | 688 | |
d6c1c5de | 689 | return 0; |
8b9987e9 | 690 | |
2608fb65 JW |
691 | err_alloc: |
692 | hv_synic_free(); | |
8b9987e9 S |
693 | free_irq(irq, hv_acpi_dev); |
694 | ||
695 | err_unregister: | |
696 | bus_unregister(&hv_bus); | |
697 | ||
698 | err_cleanup: | |
699 | hv_cleanup(); | |
700 | ||
701 | return ret; | |
3e7ee490 HJ |
702 | } |
703 | ||
90c9960e | 704 | /** |
768fa219 GKH |
705 | * __vmbus_child_driver_register - Register a vmbus's driver |
706 | * @drv: Pointer to driver structure you want to register | |
707 | * @owner: owner module of the drv | |
708 | * @mod_name: module name string | |
3e189519 HJ |
709 | * |
710 | * Registers the given driver with Linux through the 'driver_register()' call | |
768fa219 | 711 | * and sets up the hyper-v vmbus handling for this driver. |
3e189519 HJ |
712 | * It will return the state of the 'driver_register()' call. |
713 | * | |
90c9960e | 714 | */ |
768fa219 | 715 | int __vmbus_driver_register(struct hv_driver *hv_driver, struct module *owner, const char *mod_name) |
3e7ee490 | 716 | { |
5d48a1c2 | 717 | int ret; |
3e7ee490 | 718 | |
768fa219 | 719 | pr_info("registering driver %s\n", hv_driver->name); |
3e7ee490 | 720 | |
cf6a2eac S |
721 | ret = vmbus_exists(); |
722 | if (ret < 0) | |
723 | return ret; | |
724 | ||
768fa219 GKH |
725 | hv_driver->driver.name = hv_driver->name; |
726 | hv_driver->driver.owner = owner; | |
727 | hv_driver->driver.mod_name = mod_name; | |
728 | hv_driver->driver.bus = &hv_bus; | |
3e7ee490 | 729 | |
768fa219 | 730 | ret = driver_register(&hv_driver->driver); |
3e7ee490 | 731 | |
5d48a1c2 | 732 | return ret; |
3e7ee490 | 733 | } |
768fa219 | 734 | EXPORT_SYMBOL_GPL(__vmbus_driver_register); |
3e7ee490 | 735 | |
90c9960e | 736 | /** |
768fa219 GKH |
737 | * vmbus_driver_unregister() - Unregister a vmbus's driver |
738 | * @drv: Pointer to driver structure you want to un-register | |
3e189519 | 739 | * |
768fa219 GKH |
740 | * Un-register the given driver that was previous registered with a call to |
741 | * vmbus_driver_register() | |
90c9960e | 742 | */ |
768fa219 | 743 | void vmbus_driver_unregister(struct hv_driver *hv_driver) |
3e7ee490 | 744 | { |
768fa219 | 745 | pr_info("unregistering driver %s\n", hv_driver->name); |
3e7ee490 | 746 | |
cf6a2eac | 747 | if (!vmbus_exists()) |
8f257a14 | 748 | driver_unregister(&hv_driver->driver); |
3e7ee490 | 749 | } |
768fa219 | 750 | EXPORT_SYMBOL_GPL(vmbus_driver_unregister); |
3e7ee490 | 751 | |
3e189519 | 752 | /* |
f2c73011 | 753 | * vmbus_device_create - Creates and registers a new child device |
3e189519 | 754 | * on the vmbus. |
90c9960e | 755 | */ |
f2c73011 | 756 | struct hv_device *vmbus_device_create(uuid_le *type, |
358d2ee2 | 757 | uuid_le *instance, |
89733aa9 | 758 | struct vmbus_channel *channel) |
3e7ee490 | 759 | { |
3d3b5518 | 760 | struct hv_device *child_device_obj; |
3e7ee490 | 761 | |
6bad88da S |
762 | child_device_obj = kzalloc(sizeof(struct hv_device), GFP_KERNEL); |
763 | if (!child_device_obj) { | |
0a46618d | 764 | pr_err("Unable to allocate device object for child device\n"); |
3e7ee490 HJ |
765 | return NULL; |
766 | } | |
767 | ||
cae5b843 | 768 | child_device_obj->channel = channel; |
358d2ee2 | 769 | memcpy(&child_device_obj->dev_type, type, sizeof(uuid_le)); |
ca623ad3 | 770 | memcpy(&child_device_obj->dev_instance, instance, |
358d2ee2 | 771 | sizeof(uuid_le)); |
3e7ee490 | 772 | |
3e7ee490 | 773 | |
3e7ee490 HJ |
774 | return child_device_obj; |
775 | } | |
776 | ||
3e189519 | 777 | /* |
22794281 | 778 | * vmbus_device_register - Register the child device |
90c9960e | 779 | */ |
22794281 | 780 | int vmbus_device_register(struct hv_device *child_device_obj) |
3e7ee490 | 781 | { |
90c9960e | 782 | int ret = 0; |
6bad88da | 783 | |
f4888417 | 784 | static atomic_t device_num = ATOMIC_INIT(0); |
3e7ee490 | 785 | |
6bad88da | 786 | dev_set_name(&child_device_obj->device, "vmbus_0_%d", |
90c9960e | 787 | atomic_inc_return(&device_num)); |
3e7ee490 | 788 | |
0bce28b6 | 789 | child_device_obj->device.bus = &hv_bus; |
607c1a11 | 790 | child_device_obj->device.parent = &hv_acpi_dev->dev; |
6bad88da | 791 | child_device_obj->device.release = vmbus_device_release; |
3e7ee490 | 792 | |
90c9960e GKH |
793 | /* |
794 | * Register with the LDM. This will kick off the driver/device | |
795 | * binding...which will eventually call vmbus_match() and vmbus_probe() | |
796 | */ | |
6bad88da | 797 | ret = device_register(&child_device_obj->device); |
3e7ee490 | 798 | |
3e7ee490 | 799 | if (ret) |
0a46618d | 800 | pr_err("Unable to register child device\n"); |
3e7ee490 | 801 | else |
84672369 | 802 | pr_debug("child device %s registered\n", |
0a46618d | 803 | dev_name(&child_device_obj->device)); |
3e7ee490 | 804 | |
3e7ee490 HJ |
805 | return ret; |
806 | } | |
807 | ||
3e189519 | 808 | /* |
696453ba | 809 | * vmbus_device_unregister - Remove the specified child device |
3e189519 | 810 | * from the vmbus. |
90c9960e | 811 | */ |
696453ba | 812 | void vmbus_device_unregister(struct hv_device *device_obj) |
3e7ee490 | 813 | { |
84672369 FS |
814 | pr_debug("child device %s unregistered\n", |
815 | dev_name(&device_obj->device)); | |
816 | ||
90c9960e GKH |
817 | /* |
818 | * Kick off the process of unregistering the device. | |
819 | * This will call vmbus_remove() and eventually vmbus_device_release() | |
820 | */ | |
6bad88da | 821 | device_unregister(&device_obj->device); |
3e7ee490 HJ |
822 | } |
823 | ||
3e7ee490 | 824 | |
b0069f43 S |
825 | /* |
826 | * VMBUS is an acpi enumerated device. Get the the IRQ information | |
827 | * from DSDT. | |
828 | */ | |
829 | ||
830 | static acpi_status vmbus_walk_resources(struct acpi_resource *res, void *irq) | |
831 | { | |
832 | ||
833 | if (res->type == ACPI_RESOURCE_TYPE_IRQ) { | |
834 | struct acpi_resource_irq *irqp; | |
835 | irqp = &res->data.irq; | |
836 | ||
837 | *((unsigned int *)irq) = irqp->interrupts[0]; | |
838 | } | |
839 | ||
840 | return AE_OK; | |
841 | } | |
842 | ||
843 | static int vmbus_acpi_add(struct acpi_device *device) | |
844 | { | |
845 | acpi_status result; | |
846 | ||
607c1a11 S |
847 | hv_acpi_dev = device; |
848 | ||
0a4425b6 S |
849 | result = acpi_walk_resources(device->handle, METHOD_NAME__CRS, |
850 | vmbus_walk_resources, &irq); | |
b0069f43 S |
851 | |
852 | if (ACPI_FAILURE(result)) { | |
853 | complete(&probe_event); | |
854 | return -ENODEV; | |
855 | } | |
856 | complete(&probe_event); | |
857 | return 0; | |
858 | } | |
859 | ||
860 | static const struct acpi_device_id vmbus_acpi_device_ids[] = { | |
861 | {"VMBUS", 0}, | |
9d7b18d1 | 862 | {"VMBus", 0}, |
b0069f43 S |
863 | {"", 0}, |
864 | }; | |
865 | MODULE_DEVICE_TABLE(acpi, vmbus_acpi_device_ids); | |
866 | ||
867 | static struct acpi_driver vmbus_acpi_driver = { | |
868 | .name = "vmbus", | |
869 | .ids = vmbus_acpi_device_ids, | |
870 | .ops = { | |
871 | .add = vmbus_acpi_add, | |
872 | }, | |
873 | }; | |
874 | ||
607c1a11 | 875 | static int __init hv_acpi_init(void) |
1168ac22 | 876 | { |
2dda95f8 | 877 | int ret, t; |
b0069f43 | 878 | |
1f94ea81 | 879 | if (x86_hyper != &x86_hyper_ms_hyperv) |
0592969e JW |
880 | return -ENODEV; |
881 | ||
b0069f43 S |
882 | init_completion(&probe_event); |
883 | ||
884 | /* | |
885 | * Get irq resources first. | |
886 | */ | |
887 | ||
0246604c S |
888 | ret = acpi_bus_register_driver(&vmbus_acpi_driver); |
889 | ||
b0069f43 S |
890 | if (ret) |
891 | return ret; | |
892 | ||
2dda95f8 S |
893 | t = wait_for_completion_timeout(&probe_event, 5*HZ); |
894 | if (t == 0) { | |
895 | ret = -ETIMEDOUT; | |
896 | goto cleanup; | |
897 | } | |
b0069f43 S |
898 | |
899 | if (irq <= 0) { | |
2dda95f8 S |
900 | ret = -ENODEV; |
901 | goto cleanup; | |
b0069f43 S |
902 | } |
903 | ||
91fd799e S |
904 | ret = vmbus_bus_init(irq); |
905 | if (ret) | |
2dda95f8 S |
906 | goto cleanup; |
907 | ||
908 | return 0; | |
909 | ||
910 | cleanup: | |
911 | acpi_bus_unregister_driver(&vmbus_acpi_driver); | |
cf6a2eac | 912 | hv_acpi_dev = NULL; |
91fd799e | 913 | return ret; |
1168ac22 S |
914 | } |
915 | ||
93e5bd06 S |
916 | static void __exit vmbus_exit(void) |
917 | { | |
918 | ||
919 | free_irq(irq, hv_acpi_dev); | |
920 | vmbus_free_channels(); | |
921 | bus_unregister(&hv_bus); | |
922 | hv_cleanup(); | |
923 | acpi_bus_unregister_driver(&vmbus_acpi_driver); | |
924 | } | |
925 | ||
1168ac22 | 926 | |
90c9960e | 927 | MODULE_LICENSE("GPL"); |
3e7ee490 | 928 | |
43d4e119 | 929 | subsys_initcall(hv_acpi_init); |
93e5bd06 | 930 | module_exit(vmbus_exit); |