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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 | 32 | #include <linux/acpi.h> |
8b5d6d3b | 33 | #include <linux/completion.h> |
46a97191 | 34 | #include <linux/hyperv.h> |
b0209501 | 35 | #include <linux/kernel_stat.h> |
407dd164 | 36 | #include <asm/hyperv.h> |
1f94ea81 | 37 | #include <asm/hypervisor.h> |
302a3c0f | 38 | #include <asm/mshyperv.h> |
0f2a6619 | 39 | #include "hyperv_vmbus.h" |
3e7ee490 | 40 | |
607c1a11 | 41 | static struct acpi_device *hv_acpi_dev; |
1168ac22 | 42 | |
59c0e4f0 | 43 | static struct tasklet_struct msg_dpc; |
71a6655d | 44 | static struct completion probe_event; |
b0069f43 | 45 | static int irq; |
98db4335 | 46 | |
cf6a2eac S |
47 | static int vmbus_exists(void) |
48 | { | |
49 | if (hv_acpi_dev == NULL) | |
50 | return -ENODEV; | |
51 | ||
52 | return 0; | |
53 | } | |
54 | ||
fd776ba9 OH |
55 | #define VMBUS_ALIAS_LEN ((sizeof((struct hv_vmbus_device_id *)0)->guid) * 2) |
56 | static void print_alias_name(struct hv_device *hv_dev, char *alias_name) | |
57 | { | |
58 | int i; | |
59 | for (i = 0; i < VMBUS_ALIAS_LEN; i += 2) | |
60 | sprintf(&alias_name[i], "%02x", hv_dev->dev_type.b[i/2]); | |
61 | } | |
62 | ||
76c52bbe GKH |
63 | static u8 channel_monitor_group(struct vmbus_channel *channel) |
64 | { | |
65 | return (u8)channel->offermsg.monitorid / 32; | |
66 | } | |
67 | ||
68 | static u8 channel_monitor_offset(struct vmbus_channel *channel) | |
69 | { | |
70 | return (u8)channel->offermsg.monitorid % 32; | |
71 | } | |
72 | ||
73 | static u32 channel_pending(struct vmbus_channel *channel, | |
74 | struct hv_monitor_page *monitor_page) | |
75 | { | |
76 | u8 monitor_group = channel_monitor_group(channel); | |
77 | return monitor_page->trigger_group[monitor_group].pending; | |
78 | } | |
79 | ||
1cee272b GKH |
80 | static u32 channel_latency(struct vmbus_channel *channel, |
81 | struct hv_monitor_page *monitor_page) | |
82 | { | |
83 | u8 monitor_group = channel_monitor_group(channel); | |
84 | u8 monitor_offset = channel_monitor_offset(channel); | |
85 | return monitor_page->latency[monitor_group][monitor_offset]; | |
86 | } | |
87 | ||
4947c745 GKH |
88 | static u32 channel_conn_id(struct vmbus_channel *channel, |
89 | struct hv_monitor_page *monitor_page) | |
90 | { | |
91 | u8 monitor_group = channel_monitor_group(channel); | |
92 | u8 monitor_offset = channel_monitor_offset(channel); | |
93 | return monitor_page->parameter[monitor_group][monitor_offset].connectionid.u.id; | |
94 | } | |
95 | ||
03f3a910 GKH |
96 | static ssize_t id_show(struct device *dev, struct device_attribute *dev_attr, |
97 | char *buf) | |
98 | { | |
99 | struct hv_device *hv_dev = device_to_hv_device(dev); | |
100 | ||
101 | if (!hv_dev->channel) | |
102 | return -ENODEV; | |
103 | return sprintf(buf, "%d\n", hv_dev->channel->offermsg.child_relid); | |
104 | } | |
105 | static DEVICE_ATTR_RO(id); | |
106 | ||
a8fb5f3d GKH |
107 | static ssize_t state_show(struct device *dev, struct device_attribute *dev_attr, |
108 | char *buf) | |
109 | { | |
110 | struct hv_device *hv_dev = device_to_hv_device(dev); | |
111 | ||
112 | if (!hv_dev->channel) | |
113 | return -ENODEV; | |
114 | return sprintf(buf, "%d\n", hv_dev->channel->state); | |
115 | } | |
116 | static DEVICE_ATTR_RO(state); | |
117 | ||
5ffd00e2 GKH |
118 | static ssize_t monitor_id_show(struct device *dev, |
119 | struct device_attribute *dev_attr, char *buf) | |
120 | { | |
121 | struct hv_device *hv_dev = device_to_hv_device(dev); | |
122 | ||
123 | if (!hv_dev->channel) | |
124 | return -ENODEV; | |
125 | return sprintf(buf, "%d\n", hv_dev->channel->offermsg.monitorid); | |
126 | } | |
127 | static DEVICE_ATTR_RO(monitor_id); | |
128 | ||
68234c04 GKH |
129 | static ssize_t class_id_show(struct device *dev, |
130 | struct device_attribute *dev_attr, char *buf) | |
131 | { | |
132 | struct hv_device *hv_dev = device_to_hv_device(dev); | |
133 | ||
134 | if (!hv_dev->channel) | |
135 | return -ENODEV; | |
136 | return sprintf(buf, "{%pUl}\n", | |
137 | hv_dev->channel->offermsg.offer.if_type.b); | |
138 | } | |
139 | static DEVICE_ATTR_RO(class_id); | |
140 | ||
7c55e1d0 GKH |
141 | static ssize_t device_id_show(struct device *dev, |
142 | struct device_attribute *dev_attr, char *buf) | |
143 | { | |
144 | struct hv_device *hv_dev = device_to_hv_device(dev); | |
145 | ||
146 | if (!hv_dev->channel) | |
147 | return -ENODEV; | |
148 | return sprintf(buf, "{%pUl}\n", | |
149 | hv_dev->channel->offermsg.offer.if_instance.b); | |
150 | } | |
151 | static DEVICE_ATTR_RO(device_id); | |
152 | ||
647fa371 GKH |
153 | static ssize_t modalias_show(struct device *dev, |
154 | struct device_attribute *dev_attr, char *buf) | |
155 | { | |
156 | struct hv_device *hv_dev = device_to_hv_device(dev); | |
157 | char alias_name[VMBUS_ALIAS_LEN + 1]; | |
158 | ||
159 | print_alias_name(hv_dev, alias_name); | |
160 | return sprintf(buf, "vmbus:%s\n", alias_name); | |
161 | } | |
162 | static DEVICE_ATTR_RO(modalias); | |
163 | ||
76c52bbe GKH |
164 | static ssize_t server_monitor_pending_show(struct device *dev, |
165 | struct device_attribute *dev_attr, | |
166 | char *buf) | |
167 | { | |
168 | struct hv_device *hv_dev = device_to_hv_device(dev); | |
169 | ||
170 | if (!hv_dev->channel) | |
171 | return -ENODEV; | |
172 | return sprintf(buf, "%d\n", | |
173 | channel_pending(hv_dev->channel, | |
174 | vmbus_connection.monitor_pages[1])); | |
175 | } | |
176 | static DEVICE_ATTR_RO(server_monitor_pending); | |
177 | ||
178 | static ssize_t client_monitor_pending_show(struct device *dev, | |
179 | struct device_attribute *dev_attr, | |
180 | char *buf) | |
181 | { | |
182 | struct hv_device *hv_dev = device_to_hv_device(dev); | |
183 | ||
184 | if (!hv_dev->channel) | |
185 | return -ENODEV; | |
186 | return sprintf(buf, "%d\n", | |
187 | channel_pending(hv_dev->channel, | |
188 | vmbus_connection.monitor_pages[1])); | |
189 | } | |
190 | static DEVICE_ATTR_RO(client_monitor_pending); | |
68234c04 | 191 | |
1cee272b GKH |
192 | static ssize_t server_monitor_latency_show(struct device *dev, |
193 | struct device_attribute *dev_attr, | |
194 | char *buf) | |
195 | { | |
196 | struct hv_device *hv_dev = device_to_hv_device(dev); | |
197 | ||
198 | if (!hv_dev->channel) | |
199 | return -ENODEV; | |
200 | return sprintf(buf, "%d\n", | |
201 | channel_latency(hv_dev->channel, | |
202 | vmbus_connection.monitor_pages[0])); | |
203 | } | |
204 | static DEVICE_ATTR_RO(server_monitor_latency); | |
205 | ||
206 | static ssize_t client_monitor_latency_show(struct device *dev, | |
207 | struct device_attribute *dev_attr, | |
208 | char *buf) | |
209 | { | |
210 | struct hv_device *hv_dev = device_to_hv_device(dev); | |
211 | ||
212 | if (!hv_dev->channel) | |
213 | return -ENODEV; | |
214 | return sprintf(buf, "%d\n", | |
215 | channel_latency(hv_dev->channel, | |
216 | vmbus_connection.monitor_pages[1])); | |
217 | } | |
218 | static DEVICE_ATTR_RO(client_monitor_latency); | |
219 | ||
4947c745 GKH |
220 | static ssize_t server_monitor_conn_id_show(struct device *dev, |
221 | struct device_attribute *dev_attr, | |
222 | char *buf) | |
223 | { | |
224 | struct hv_device *hv_dev = device_to_hv_device(dev); | |
225 | ||
226 | if (!hv_dev->channel) | |
227 | return -ENODEV; | |
228 | return sprintf(buf, "%d\n", | |
229 | channel_conn_id(hv_dev->channel, | |
230 | vmbus_connection.monitor_pages[0])); | |
231 | } | |
232 | static DEVICE_ATTR_RO(server_monitor_conn_id); | |
233 | ||
234 | static ssize_t client_monitor_conn_id_show(struct device *dev, | |
235 | struct device_attribute *dev_attr, | |
236 | char *buf) | |
237 | { | |
238 | struct hv_device *hv_dev = device_to_hv_device(dev); | |
239 | ||
240 | if (!hv_dev->channel) | |
241 | return -ENODEV; | |
242 | return sprintf(buf, "%d\n", | |
243 | channel_conn_id(hv_dev->channel, | |
244 | vmbus_connection.monitor_pages[1])); | |
245 | } | |
246 | static DEVICE_ATTR_RO(client_monitor_conn_id); | |
247 | ||
98f4c651 GKH |
248 | static ssize_t out_intr_mask_show(struct device *dev, |
249 | struct device_attribute *dev_attr, char *buf) | |
250 | { | |
251 | struct hv_device *hv_dev = device_to_hv_device(dev); | |
252 | struct hv_ring_buffer_debug_info outbound; | |
253 | ||
254 | if (!hv_dev->channel) | |
255 | return -ENODEV; | |
256 | hv_ringbuffer_get_debuginfo(&hv_dev->channel->outbound, &outbound); | |
257 | return sprintf(buf, "%d\n", outbound.current_interrupt_mask); | |
258 | } | |
259 | static DEVICE_ATTR_RO(out_intr_mask); | |
260 | ||
261 | static ssize_t out_read_index_show(struct device *dev, | |
262 | struct device_attribute *dev_attr, char *buf) | |
263 | { | |
264 | struct hv_device *hv_dev = device_to_hv_device(dev); | |
265 | struct hv_ring_buffer_debug_info outbound; | |
266 | ||
267 | if (!hv_dev->channel) | |
268 | return -ENODEV; | |
269 | hv_ringbuffer_get_debuginfo(&hv_dev->channel->outbound, &outbound); | |
270 | return sprintf(buf, "%d\n", outbound.current_read_index); | |
271 | } | |
272 | static DEVICE_ATTR_RO(out_read_index); | |
273 | ||
274 | static ssize_t out_write_index_show(struct device *dev, | |
275 | struct device_attribute *dev_attr, | |
276 | char *buf) | |
277 | { | |
278 | struct hv_device *hv_dev = device_to_hv_device(dev); | |
279 | struct hv_ring_buffer_debug_info outbound; | |
280 | ||
281 | if (!hv_dev->channel) | |
282 | return -ENODEV; | |
283 | hv_ringbuffer_get_debuginfo(&hv_dev->channel->outbound, &outbound); | |
284 | return sprintf(buf, "%d\n", outbound.current_write_index); | |
285 | } | |
286 | static DEVICE_ATTR_RO(out_write_index); | |
287 | ||
288 | static ssize_t out_read_bytes_avail_show(struct device *dev, | |
289 | struct device_attribute *dev_attr, | |
290 | char *buf) | |
291 | { | |
292 | struct hv_device *hv_dev = device_to_hv_device(dev); | |
293 | struct hv_ring_buffer_debug_info outbound; | |
294 | ||
295 | if (!hv_dev->channel) | |
296 | return -ENODEV; | |
297 | hv_ringbuffer_get_debuginfo(&hv_dev->channel->outbound, &outbound); | |
298 | return sprintf(buf, "%d\n", outbound.bytes_avail_toread); | |
299 | } | |
300 | static DEVICE_ATTR_RO(out_read_bytes_avail); | |
301 | ||
302 | static ssize_t out_write_bytes_avail_show(struct device *dev, | |
303 | struct device_attribute *dev_attr, | |
304 | char *buf) | |
305 | { | |
306 | struct hv_device *hv_dev = device_to_hv_device(dev); | |
307 | struct hv_ring_buffer_debug_info outbound; | |
308 | ||
309 | if (!hv_dev->channel) | |
310 | return -ENODEV; | |
311 | hv_ringbuffer_get_debuginfo(&hv_dev->channel->outbound, &outbound); | |
312 | return sprintf(buf, "%d\n", outbound.bytes_avail_towrite); | |
313 | } | |
314 | static DEVICE_ATTR_RO(out_write_bytes_avail); | |
315 | ||
316 | static ssize_t in_intr_mask_show(struct device *dev, | |
317 | struct device_attribute *dev_attr, char *buf) | |
318 | { | |
319 | struct hv_device *hv_dev = device_to_hv_device(dev); | |
320 | struct hv_ring_buffer_debug_info inbound; | |
321 | ||
322 | if (!hv_dev->channel) | |
323 | return -ENODEV; | |
324 | hv_ringbuffer_get_debuginfo(&hv_dev->channel->inbound, &inbound); | |
325 | return sprintf(buf, "%d\n", inbound.current_interrupt_mask); | |
326 | } | |
327 | static DEVICE_ATTR_RO(in_intr_mask); | |
328 | ||
329 | static ssize_t in_read_index_show(struct device *dev, | |
330 | struct device_attribute *dev_attr, char *buf) | |
331 | { | |
332 | struct hv_device *hv_dev = device_to_hv_device(dev); | |
333 | struct hv_ring_buffer_debug_info inbound; | |
334 | ||
335 | if (!hv_dev->channel) | |
336 | return -ENODEV; | |
337 | hv_ringbuffer_get_debuginfo(&hv_dev->channel->inbound, &inbound); | |
338 | return sprintf(buf, "%d\n", inbound.current_read_index); | |
339 | } | |
340 | static DEVICE_ATTR_RO(in_read_index); | |
341 | ||
342 | static ssize_t in_write_index_show(struct device *dev, | |
343 | struct device_attribute *dev_attr, char *buf) | |
344 | { | |
345 | struct hv_device *hv_dev = device_to_hv_device(dev); | |
346 | struct hv_ring_buffer_debug_info inbound; | |
347 | ||
348 | if (!hv_dev->channel) | |
349 | return -ENODEV; | |
350 | hv_ringbuffer_get_debuginfo(&hv_dev->channel->inbound, &inbound); | |
351 | return sprintf(buf, "%d\n", inbound.current_write_index); | |
352 | } | |
353 | static DEVICE_ATTR_RO(in_write_index); | |
354 | ||
355 | static ssize_t in_read_bytes_avail_show(struct device *dev, | |
356 | struct device_attribute *dev_attr, | |
357 | char *buf) | |
358 | { | |
359 | struct hv_device *hv_dev = device_to_hv_device(dev); | |
360 | struct hv_ring_buffer_debug_info inbound; | |
361 | ||
362 | if (!hv_dev->channel) | |
363 | return -ENODEV; | |
364 | hv_ringbuffer_get_debuginfo(&hv_dev->channel->inbound, &inbound); | |
365 | return sprintf(buf, "%d\n", inbound.bytes_avail_toread); | |
366 | } | |
367 | static DEVICE_ATTR_RO(in_read_bytes_avail); | |
368 | ||
369 | static ssize_t in_write_bytes_avail_show(struct device *dev, | |
370 | struct device_attribute *dev_attr, | |
371 | char *buf) | |
372 | { | |
373 | struct hv_device *hv_dev = device_to_hv_device(dev); | |
374 | struct hv_ring_buffer_debug_info inbound; | |
375 | ||
376 | if (!hv_dev->channel) | |
377 | return -ENODEV; | |
378 | hv_ringbuffer_get_debuginfo(&hv_dev->channel->inbound, &inbound); | |
379 | return sprintf(buf, "%d\n", inbound.bytes_avail_towrite); | |
380 | } | |
381 | static DEVICE_ATTR_RO(in_write_bytes_avail); | |
382 | ||
383 | /* Set up per device attributes in /sys/bus/vmbus/devices/<bus device> */ | |
03f3a910 GKH |
384 | static struct attribute *vmbus_attrs[] = { |
385 | &dev_attr_id.attr, | |
a8fb5f3d | 386 | &dev_attr_state.attr, |
5ffd00e2 | 387 | &dev_attr_monitor_id.attr, |
68234c04 | 388 | &dev_attr_class_id.attr, |
7c55e1d0 | 389 | &dev_attr_device_id.attr, |
647fa371 | 390 | &dev_attr_modalias.attr, |
76c52bbe GKH |
391 | &dev_attr_server_monitor_pending.attr, |
392 | &dev_attr_client_monitor_pending.attr, | |
1cee272b GKH |
393 | &dev_attr_server_monitor_latency.attr, |
394 | &dev_attr_client_monitor_latency.attr, | |
4947c745 GKH |
395 | &dev_attr_server_monitor_conn_id.attr, |
396 | &dev_attr_client_monitor_conn_id.attr, | |
98f4c651 GKH |
397 | &dev_attr_out_intr_mask.attr, |
398 | &dev_attr_out_read_index.attr, | |
399 | &dev_attr_out_write_index.attr, | |
400 | &dev_attr_out_read_bytes_avail.attr, | |
401 | &dev_attr_out_write_bytes_avail.attr, | |
402 | &dev_attr_in_intr_mask.attr, | |
403 | &dev_attr_in_read_index.attr, | |
404 | &dev_attr_in_write_index.attr, | |
405 | &dev_attr_in_read_bytes_avail.attr, | |
406 | &dev_attr_in_write_bytes_avail.attr, | |
03f3a910 GKH |
407 | NULL, |
408 | }; | |
409 | ATTRIBUTE_GROUPS(vmbus); | |
410 | ||
adde2487 S |
411 | /* |
412 | * vmbus_uevent - add uevent for our device | |
413 | * | |
414 | * This routine is invoked when a device is added or removed on the vmbus to | |
415 | * generate a uevent to udev in the userspace. The udev will then look at its | |
416 | * rule and the uevent generated here to load the appropriate driver | |
0ddda660 S |
417 | * |
418 | * The alias string will be of the form vmbus:guid where guid is the string | |
419 | * representation of the device guid (each byte of the guid will be | |
420 | * represented with two hex characters. | |
adde2487 S |
421 | */ |
422 | static int vmbus_uevent(struct device *device, struct kobj_uevent_env *env) | |
423 | { | |
424 | struct hv_device *dev = device_to_hv_device(device); | |
fd776ba9 OH |
425 | int ret; |
426 | char alias_name[VMBUS_ALIAS_LEN + 1]; | |
0ddda660 | 427 | |
fd776ba9 | 428 | print_alias_name(dev, alias_name); |
0ddda660 S |
429 | ret = add_uevent_var(env, "MODALIAS=vmbus:%s", alias_name); |
430 | return ret; | |
adde2487 S |
431 | } |
432 | ||
5841a829 S |
433 | static uuid_le null_guid; |
434 | ||
435 | static inline bool is_null_guid(const __u8 *guid) | |
436 | { | |
437 | if (memcmp(guid, &null_guid, sizeof(uuid_le))) | |
438 | return false; | |
439 | return true; | |
440 | } | |
441 | ||
3037a7b6 S |
442 | /* |
443 | * Return a matching hv_vmbus_device_id pointer. | |
444 | * If there is no match, return NULL. | |
445 | */ | |
446 | static const struct hv_vmbus_device_id *hv_vmbus_get_id( | |
447 | const struct hv_vmbus_device_id *id, | |
448 | __u8 *guid) | |
449 | { | |
450 | for (; !is_null_guid(id->guid); id++) | |
451 | if (!memcmp(&id->guid, guid, sizeof(uuid_le))) | |
452 | return id; | |
453 | ||
454 | return NULL; | |
455 | } | |
456 | ||
457 | ||
b7fc147b S |
458 | |
459 | /* | |
460 | * vmbus_match - Attempt to match the specified device to the specified driver | |
461 | */ | |
462 | static int vmbus_match(struct device *device, struct device_driver *driver) | |
463 | { | |
b7fc147b | 464 | struct hv_driver *drv = drv_to_hv_drv(driver); |
e8e27047 | 465 | struct hv_device *hv_dev = device_to_hv_device(device); |
b7fc147b | 466 | |
3037a7b6 S |
467 | if (hv_vmbus_get_id(drv->id_table, hv_dev->dev_type.b)) |
468 | return 1; | |
de632a2b | 469 | |
5841a829 | 470 | return 0; |
b7fc147b S |
471 | } |
472 | ||
f1f0d67b S |
473 | /* |
474 | * vmbus_probe - Add the new vmbus's child device | |
475 | */ | |
476 | static int vmbus_probe(struct device *child_device) | |
477 | { | |
478 | int ret = 0; | |
479 | struct hv_driver *drv = | |
480 | drv_to_hv_drv(child_device->driver); | |
9efd21e1 | 481 | struct hv_device *dev = device_to_hv_device(child_device); |
84946899 | 482 | const struct hv_vmbus_device_id *dev_id; |
f1f0d67b | 483 | |
84946899 | 484 | dev_id = hv_vmbus_get_id(drv->id_table, dev->dev_type.b); |
9efd21e1 | 485 | if (drv->probe) { |
84946899 | 486 | ret = drv->probe(dev, dev_id); |
b14a7b30 | 487 | if (ret != 0) |
0a46618d HJ |
488 | pr_err("probe failed for device %s (%d)\n", |
489 | dev_name(child_device), ret); | |
f1f0d67b | 490 | |
f1f0d67b | 491 | } else { |
0a46618d HJ |
492 | pr_err("probe not set for driver %s\n", |
493 | dev_name(child_device)); | |
6de925b1 | 494 | ret = -ENODEV; |
f1f0d67b S |
495 | } |
496 | return ret; | |
497 | } | |
498 | ||
c5dce3db S |
499 | /* |
500 | * vmbus_remove - Remove a vmbus device | |
501 | */ | |
502 | static int vmbus_remove(struct device *child_device) | |
503 | { | |
d4372179 | 504 | struct hv_driver *drv = drv_to_hv_drv(child_device->driver); |
415b023a | 505 | struct hv_device *dev = device_to_hv_device(child_device); |
c5dce3db | 506 | |
d4372179 S |
507 | if (drv->remove) |
508 | drv->remove(dev); | |
509 | else | |
510 | pr_err("remove not set for driver %s\n", | |
511 | dev_name(child_device)); | |
c5dce3db S |
512 | |
513 | return 0; | |
514 | } | |
515 | ||
eb1bb259 S |
516 | |
517 | /* | |
518 | * vmbus_shutdown - Shutdown a vmbus device | |
519 | */ | |
520 | static void vmbus_shutdown(struct device *child_device) | |
521 | { | |
522 | struct hv_driver *drv; | |
ca6887fb | 523 | struct hv_device *dev = device_to_hv_device(child_device); |
eb1bb259 S |
524 | |
525 | ||
526 | /* The device may not be attached yet */ | |
527 | if (!child_device->driver) | |
528 | return; | |
529 | ||
530 | drv = drv_to_hv_drv(child_device->driver); | |
531 | ||
ca6887fb S |
532 | if (drv->shutdown) |
533 | drv->shutdown(dev); | |
eb1bb259 S |
534 | |
535 | return; | |
536 | } | |
537 | ||
086e7a56 S |
538 | |
539 | /* | |
540 | * vmbus_device_release - Final callback release of the vmbus child device | |
541 | */ | |
542 | static void vmbus_device_release(struct device *device) | |
543 | { | |
e8e27047 | 544 | struct hv_device *hv_dev = device_to_hv_device(device); |
086e7a56 | 545 | |
e8e27047 | 546 | kfree(hv_dev); |
086e7a56 S |
547 | |
548 | } | |
549 | ||
454f18a9 | 550 | /* The one and only one */ |
9adcac5c S |
551 | static struct bus_type hv_bus = { |
552 | .name = "vmbus", | |
553 | .match = vmbus_match, | |
554 | .shutdown = vmbus_shutdown, | |
555 | .remove = vmbus_remove, | |
556 | .probe = vmbus_probe, | |
557 | .uevent = vmbus_uevent, | |
03f3a910 | 558 | .dev_groups = vmbus_groups, |
3e7ee490 HJ |
559 | }; |
560 | ||
adf874cb | 561 | static const char *driver_name = "hyperv"; |
36199a99 | 562 | |
36199a99 | 563 | |
bf6506f6 TT |
564 | struct onmessage_work_context { |
565 | struct work_struct work; | |
566 | struct hv_message msg; | |
567 | }; | |
568 | ||
569 | static void vmbus_onmessage_work(struct work_struct *work) | |
570 | { | |
571 | struct onmessage_work_context *ctx; | |
572 | ||
573 | ctx = container_of(work, struct onmessage_work_context, | |
574 | work); | |
575 | vmbus_onmessage(&ctx->msg); | |
576 | kfree(ctx); | |
577 | } | |
578 | ||
62c1059d | 579 | static void vmbus_on_msg_dpc(unsigned long data) |
36199a99 GKH |
580 | { |
581 | int cpu = smp_processor_id(); | |
582 | void *page_addr = hv_context.synic_message_page[cpu]; | |
583 | struct hv_message *msg = (struct hv_message *)page_addr + | |
584 | VMBUS_MESSAGE_SINT; | |
bf6506f6 | 585 | struct onmessage_work_context *ctx; |
36199a99 GKH |
586 | |
587 | while (1) { | |
588 | if (msg->header.message_type == HVMSG_NONE) { | |
589 | /* no msg */ | |
590 | break; | |
591 | } else { | |
bf6506f6 TT |
592 | ctx = kmalloc(sizeof(*ctx), GFP_ATOMIC); |
593 | if (ctx == NULL) | |
36199a99 | 594 | continue; |
bf6506f6 TT |
595 | INIT_WORK(&ctx->work, vmbus_onmessage_work); |
596 | memcpy(&ctx->msg, msg, sizeof(*msg)); | |
da9fcb72 | 597 | queue_work(vmbus_connection.work_queue, &ctx->work); |
36199a99 GKH |
598 | } |
599 | ||
600 | msg->header.message_type = HVMSG_NONE; | |
601 | ||
602 | /* | |
603 | * Make sure the write to MessageType (ie set to | |
604 | * HVMSG_NONE) happens before we read the | |
605 | * MessagePending and EOMing. Otherwise, the EOMing | |
606 | * will not deliver any more messages since there is | |
607 | * no empty slot | |
608 | */ | |
35848f68 | 609 | mb(); |
36199a99 GKH |
610 | |
611 | if (msg->header.message_flags.msg_pending) { | |
612 | /* | |
613 | * This will cause message queue rescan to | |
614 | * possibly deliver another msg from the | |
615 | * hypervisor | |
616 | */ | |
617 | wrmsrl(HV_X64_MSR_EOM, 0); | |
618 | } | |
619 | } | |
620 | } | |
621 | ||
ae4636e6 | 622 | static irqreturn_t vmbus_isr(int irq, void *dev_id) |
36199a99 | 623 | { |
36199a99 GKH |
624 | int cpu = smp_processor_id(); |
625 | void *page_addr; | |
626 | struct hv_message *msg; | |
627 | union hv_synic_event_flags *event; | |
ae4636e6 | 628 | bool handled = false; |
36199a99 | 629 | |
5ab05951 S |
630 | page_addr = hv_context.synic_event_page[cpu]; |
631 | if (page_addr == NULL) | |
632 | return IRQ_NONE; | |
633 | ||
634 | event = (union hv_synic_event_flags *)page_addr + | |
635 | VMBUS_MESSAGE_SINT; | |
7341d908 S |
636 | /* |
637 | * Check for events before checking for messages. This is the order | |
638 | * in which events and messages are checked in Windows guests on | |
639 | * Hyper-V, and the Windows team suggested we do the same. | |
640 | */ | |
36199a99 | 641 | |
6552ecd7 S |
642 | if ((vmbus_proto_version == VERSION_WS2008) || |
643 | (vmbus_proto_version == VERSION_WIN7)) { | |
36199a99 | 644 | |
6552ecd7 S |
645 | /* Since we are a child, we only need to check bit 0 */ |
646 | if (sync_test_and_clear_bit(0, | |
647 | (unsigned long *) &event->flags32[0])) { | |
648 | handled = true; | |
649 | } | |
650 | } else { | |
651 | /* | |
652 | * Our host is win8 or above. The signaling mechanism | |
653 | * has changed and we can directly look at the event page. | |
654 | * If bit n is set then we have an interrup on the channel | |
655 | * whose id is n. | |
656 | */ | |
ae4636e6 | 657 | handled = true; |
ae4636e6 | 658 | } |
793be9c7 | 659 | |
6552ecd7 | 660 | if (handled) |
db11f12a | 661 | tasklet_schedule(hv_context.event_dpc[cpu]); |
6552ecd7 S |
662 | |
663 | ||
7341d908 S |
664 | page_addr = hv_context.synic_message_page[cpu]; |
665 | msg = (struct hv_message *)page_addr + VMBUS_MESSAGE_SINT; | |
666 | ||
667 | /* Check if there are actual msgs to be processed */ | |
668 | if (msg->header.message_type != HVMSG_NONE) { | |
669 | handled = true; | |
670 | tasklet_schedule(&msg_dpc); | |
671 | } | |
672 | ||
ae4636e6 | 673 | if (handled) |
793be9c7 | 674 | return IRQ_HANDLED; |
ae4636e6 | 675 | else |
793be9c7 | 676 | return IRQ_NONE; |
793be9c7 S |
677 | } |
678 | ||
b0209501 S |
679 | /* |
680 | * vmbus interrupt flow handler: | |
681 | * vmbus interrupts can concurrently occur on multiple CPUs and | |
682 | * can be handled concurrently. | |
683 | */ | |
684 | ||
83ebf6e5 | 685 | static void vmbus_flow_handler(unsigned int irq, struct irq_desc *desc) |
b0209501 S |
686 | { |
687 | kstat_incr_irqs_this_cpu(irq, desc); | |
688 | ||
689 | desc->action->handler(irq, desc->action->dev_id); | |
690 | } | |
691 | ||
3e189519 | 692 | /* |
90c9960e GKH |
693 | * vmbus_bus_init -Main vmbus driver initialization routine. |
694 | * | |
695 | * Here, we | |
0686e4f4 | 696 | * - initialize the vmbus driver context |
0686e4f4 LL |
697 | * - invoke the vmbus hv main init routine |
698 | * - get the irq resource | |
0686e4f4 | 699 | * - retrieve the channel offers |
90c9960e | 700 | */ |
9aaa995e | 701 | static int vmbus_bus_init(int irq) |
3e7ee490 | 702 | { |
90c9960e | 703 | int ret; |
3e7ee490 | 704 | |
6d26e38f GKH |
705 | /* Hypervisor initialization...setup hypercall page..etc */ |
706 | ret = hv_init(); | |
90c9960e | 707 | if (ret != 0) { |
0a46618d | 708 | pr_err("Unable to initialize the hypervisor - 0x%x\n", ret); |
d6c1c5de | 709 | return ret; |
3e7ee490 HJ |
710 | } |
711 | ||
59c0e4f0 | 712 | tasklet_init(&msg_dpc, vmbus_on_msg_dpc, 0); |
3e7ee490 | 713 | |
9adcac5c | 714 | ret = bus_register(&hv_bus); |
d6c1c5de | 715 | if (ret) |
8b9987e9 | 716 | goto err_cleanup; |
3e7ee490 | 717 | |
20ed3ef7 | 718 | ret = request_irq(irq, vmbus_isr, 0, driver_name, hv_acpi_dev); |
3e7ee490 | 719 | |
90c9960e | 720 | if (ret != 0) { |
0a46618d | 721 | pr_err("Unable to request IRQ %d\n", |
9aaa995e | 722 | irq); |
8b9987e9 | 723 | goto err_unregister; |
3e7ee490 | 724 | } |
3e7ee490 | 725 | |
b0209501 S |
726 | /* |
727 | * Vmbus interrupts can be handled concurrently on | |
728 | * different CPUs. Establish an appropriate interrupt flow | |
729 | * handler that can support this model. | |
730 | */ | |
731 | irq_set_handler(irq, vmbus_flow_handler); | |
732 | ||
302a3c0f S |
733 | /* |
734 | * Register our interrupt handler. | |
735 | */ | |
736 | hv_register_vmbus_handler(irq, vmbus_isr); | |
3e7ee490 | 737 | |
2608fb65 JW |
738 | ret = hv_synic_alloc(); |
739 | if (ret) | |
740 | goto err_alloc; | |
800b6902 | 741 | /* |
302a3c0f | 742 | * Initialize the per-cpu interrupt state and |
800b6902 S |
743 | * connect to the host. |
744 | */ | |
302a3c0f | 745 | on_each_cpu(hv_synic_init, NULL, 1); |
800b6902 | 746 | ret = vmbus_connect(); |
8b9987e9 | 747 | if (ret) |
2608fb65 | 748 | goto err_alloc; |
800b6902 | 749 | |
2d6e882b | 750 | vmbus_request_offers(); |
8b5d6d3b | 751 | |
d6c1c5de | 752 | return 0; |
8b9987e9 | 753 | |
2608fb65 JW |
754 | err_alloc: |
755 | hv_synic_free(); | |
8b9987e9 S |
756 | free_irq(irq, hv_acpi_dev); |
757 | ||
758 | err_unregister: | |
759 | bus_unregister(&hv_bus); | |
760 | ||
761 | err_cleanup: | |
762 | hv_cleanup(); | |
763 | ||
764 | return ret; | |
3e7ee490 HJ |
765 | } |
766 | ||
90c9960e | 767 | /** |
768fa219 GKH |
768 | * __vmbus_child_driver_register - Register a vmbus's driver |
769 | * @drv: Pointer to driver structure you want to register | |
770 | * @owner: owner module of the drv | |
771 | * @mod_name: module name string | |
3e189519 HJ |
772 | * |
773 | * Registers the given driver with Linux through the 'driver_register()' call | |
768fa219 | 774 | * and sets up the hyper-v vmbus handling for this driver. |
3e189519 HJ |
775 | * It will return the state of the 'driver_register()' call. |
776 | * | |
90c9960e | 777 | */ |
768fa219 | 778 | int __vmbus_driver_register(struct hv_driver *hv_driver, struct module *owner, const char *mod_name) |
3e7ee490 | 779 | { |
5d48a1c2 | 780 | int ret; |
3e7ee490 | 781 | |
768fa219 | 782 | pr_info("registering driver %s\n", hv_driver->name); |
3e7ee490 | 783 | |
cf6a2eac S |
784 | ret = vmbus_exists(); |
785 | if (ret < 0) | |
786 | return ret; | |
787 | ||
768fa219 GKH |
788 | hv_driver->driver.name = hv_driver->name; |
789 | hv_driver->driver.owner = owner; | |
790 | hv_driver->driver.mod_name = mod_name; | |
791 | hv_driver->driver.bus = &hv_bus; | |
3e7ee490 | 792 | |
768fa219 | 793 | ret = driver_register(&hv_driver->driver); |
3e7ee490 | 794 | |
5d48a1c2 | 795 | return ret; |
3e7ee490 | 796 | } |
768fa219 | 797 | EXPORT_SYMBOL_GPL(__vmbus_driver_register); |
3e7ee490 | 798 | |
90c9960e | 799 | /** |
768fa219 GKH |
800 | * vmbus_driver_unregister() - Unregister a vmbus's driver |
801 | * @drv: Pointer to driver structure you want to un-register | |
3e189519 | 802 | * |
768fa219 GKH |
803 | * Un-register the given driver that was previous registered with a call to |
804 | * vmbus_driver_register() | |
90c9960e | 805 | */ |
768fa219 | 806 | void vmbus_driver_unregister(struct hv_driver *hv_driver) |
3e7ee490 | 807 | { |
768fa219 | 808 | pr_info("unregistering driver %s\n", hv_driver->name); |
3e7ee490 | 809 | |
cf6a2eac | 810 | if (!vmbus_exists()) |
8f257a14 | 811 | driver_unregister(&hv_driver->driver); |
3e7ee490 | 812 | } |
768fa219 | 813 | EXPORT_SYMBOL_GPL(vmbus_driver_unregister); |
3e7ee490 | 814 | |
3e189519 | 815 | /* |
f2c73011 | 816 | * vmbus_device_create - Creates and registers a new child device |
3e189519 | 817 | * on the vmbus. |
90c9960e | 818 | */ |
f2c73011 | 819 | struct hv_device *vmbus_device_create(uuid_le *type, |
358d2ee2 | 820 | uuid_le *instance, |
89733aa9 | 821 | struct vmbus_channel *channel) |
3e7ee490 | 822 | { |
3d3b5518 | 823 | struct hv_device *child_device_obj; |
3e7ee490 | 824 | |
6bad88da S |
825 | child_device_obj = kzalloc(sizeof(struct hv_device), GFP_KERNEL); |
826 | if (!child_device_obj) { | |
0a46618d | 827 | pr_err("Unable to allocate device object for child device\n"); |
3e7ee490 HJ |
828 | return NULL; |
829 | } | |
830 | ||
cae5b843 | 831 | child_device_obj->channel = channel; |
358d2ee2 | 832 | memcpy(&child_device_obj->dev_type, type, sizeof(uuid_le)); |
ca623ad3 | 833 | memcpy(&child_device_obj->dev_instance, instance, |
358d2ee2 | 834 | sizeof(uuid_le)); |
3e7ee490 | 835 | |
3e7ee490 | 836 | |
3e7ee490 HJ |
837 | return child_device_obj; |
838 | } | |
839 | ||
3e189519 | 840 | /* |
22794281 | 841 | * vmbus_device_register - Register the child device |
90c9960e | 842 | */ |
22794281 | 843 | int vmbus_device_register(struct hv_device *child_device_obj) |
3e7ee490 | 844 | { |
90c9960e | 845 | int ret = 0; |
6bad88da | 846 | |
f4888417 | 847 | static atomic_t device_num = ATOMIC_INIT(0); |
3e7ee490 | 848 | |
6bad88da | 849 | dev_set_name(&child_device_obj->device, "vmbus_0_%d", |
90c9960e | 850 | atomic_inc_return(&device_num)); |
3e7ee490 | 851 | |
0bce28b6 | 852 | child_device_obj->device.bus = &hv_bus; |
607c1a11 | 853 | child_device_obj->device.parent = &hv_acpi_dev->dev; |
6bad88da | 854 | child_device_obj->device.release = vmbus_device_release; |
3e7ee490 | 855 | |
90c9960e GKH |
856 | /* |
857 | * Register with the LDM. This will kick off the driver/device | |
858 | * binding...which will eventually call vmbus_match() and vmbus_probe() | |
859 | */ | |
6bad88da | 860 | ret = device_register(&child_device_obj->device); |
3e7ee490 | 861 | |
3e7ee490 | 862 | if (ret) |
0a46618d | 863 | pr_err("Unable to register child device\n"); |
3e7ee490 | 864 | else |
84672369 | 865 | pr_debug("child device %s registered\n", |
0a46618d | 866 | dev_name(&child_device_obj->device)); |
3e7ee490 | 867 | |
3e7ee490 HJ |
868 | return ret; |
869 | } | |
870 | ||
3e189519 | 871 | /* |
696453ba | 872 | * vmbus_device_unregister - Remove the specified child device |
3e189519 | 873 | * from the vmbus. |
90c9960e | 874 | */ |
696453ba | 875 | void vmbus_device_unregister(struct hv_device *device_obj) |
3e7ee490 | 876 | { |
84672369 FS |
877 | pr_debug("child device %s unregistered\n", |
878 | dev_name(&device_obj->device)); | |
879 | ||
90c9960e GKH |
880 | /* |
881 | * Kick off the process of unregistering the device. | |
882 | * This will call vmbus_remove() and eventually vmbus_device_release() | |
883 | */ | |
6bad88da | 884 | device_unregister(&device_obj->device); |
3e7ee490 HJ |
885 | } |
886 | ||
3e7ee490 | 887 | |
b0069f43 S |
888 | /* |
889 | * VMBUS is an acpi enumerated device. Get the the IRQ information | |
890 | * from DSDT. | |
891 | */ | |
892 | ||
893 | static acpi_status vmbus_walk_resources(struct acpi_resource *res, void *irq) | |
894 | { | |
895 | ||
896 | if (res->type == ACPI_RESOURCE_TYPE_IRQ) { | |
897 | struct acpi_resource_irq *irqp; | |
898 | irqp = &res->data.irq; | |
899 | ||
900 | *((unsigned int *)irq) = irqp->interrupts[0]; | |
901 | } | |
902 | ||
903 | return AE_OK; | |
904 | } | |
905 | ||
906 | static int vmbus_acpi_add(struct acpi_device *device) | |
907 | { | |
908 | acpi_status result; | |
909 | ||
607c1a11 S |
910 | hv_acpi_dev = device; |
911 | ||
0a4425b6 S |
912 | result = acpi_walk_resources(device->handle, METHOD_NAME__CRS, |
913 | vmbus_walk_resources, &irq); | |
b0069f43 S |
914 | |
915 | if (ACPI_FAILURE(result)) { | |
916 | complete(&probe_event); | |
917 | return -ENODEV; | |
918 | } | |
919 | complete(&probe_event); | |
920 | return 0; | |
921 | } | |
922 | ||
923 | static const struct acpi_device_id vmbus_acpi_device_ids[] = { | |
924 | {"VMBUS", 0}, | |
9d7b18d1 | 925 | {"VMBus", 0}, |
b0069f43 S |
926 | {"", 0}, |
927 | }; | |
928 | MODULE_DEVICE_TABLE(acpi, vmbus_acpi_device_ids); | |
929 | ||
930 | static struct acpi_driver vmbus_acpi_driver = { | |
931 | .name = "vmbus", | |
932 | .ids = vmbus_acpi_device_ids, | |
933 | .ops = { | |
934 | .add = vmbus_acpi_add, | |
935 | }, | |
936 | }; | |
937 | ||
607c1a11 | 938 | static int __init hv_acpi_init(void) |
1168ac22 | 939 | { |
2dda95f8 | 940 | int ret, t; |
b0069f43 | 941 | |
1f94ea81 | 942 | if (x86_hyper != &x86_hyper_ms_hyperv) |
0592969e JW |
943 | return -ENODEV; |
944 | ||
b0069f43 S |
945 | init_completion(&probe_event); |
946 | ||
947 | /* | |
948 | * Get irq resources first. | |
949 | */ | |
950 | ||
0246604c S |
951 | ret = acpi_bus_register_driver(&vmbus_acpi_driver); |
952 | ||
b0069f43 S |
953 | if (ret) |
954 | return ret; | |
955 | ||
2dda95f8 S |
956 | t = wait_for_completion_timeout(&probe_event, 5*HZ); |
957 | if (t == 0) { | |
958 | ret = -ETIMEDOUT; | |
959 | goto cleanup; | |
960 | } | |
b0069f43 S |
961 | |
962 | if (irq <= 0) { | |
2dda95f8 S |
963 | ret = -ENODEV; |
964 | goto cleanup; | |
b0069f43 S |
965 | } |
966 | ||
91fd799e S |
967 | ret = vmbus_bus_init(irq); |
968 | if (ret) | |
2dda95f8 S |
969 | goto cleanup; |
970 | ||
971 | return 0; | |
972 | ||
973 | cleanup: | |
974 | acpi_bus_unregister_driver(&vmbus_acpi_driver); | |
cf6a2eac | 975 | hv_acpi_dev = NULL; |
91fd799e | 976 | return ret; |
1168ac22 S |
977 | } |
978 | ||
93e5bd06 S |
979 | static void __exit vmbus_exit(void) |
980 | { | |
981 | ||
982 | free_irq(irq, hv_acpi_dev); | |
983 | vmbus_free_channels(); | |
984 | bus_unregister(&hv_bus); | |
985 | hv_cleanup(); | |
986 | acpi_bus_unregister_driver(&vmbus_acpi_driver); | |
987 | } | |
988 | ||
1168ac22 | 989 | |
90c9960e | 990 | MODULE_LICENSE("GPL"); |
3e7ee490 | 991 | |
43d4e119 | 992 | subsys_initcall(hv_acpi_init); |
93e5bd06 | 993 | module_exit(vmbus_exit); |