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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> | |
3e7ee490 HJ |
28 | #include <linux/interrupt.h> |
29 | #include <linux/sysctl.h> | |
5a0e3ad6 | 30 | #include <linux/slab.h> |
b0069f43 | 31 | #include <linux/acpi.h> |
8b5d6d3b | 32 | #include <linux/completion.h> |
46a97191 | 33 | #include <linux/hyperv.h> |
b0209501 | 34 | #include <linux/kernel_stat.h> |
4061ed9e | 35 | #include <linux/clockchips.h> |
e513229b | 36 | #include <linux/cpu.h> |
407dd164 | 37 | #include <asm/hyperv.h> |
1f94ea81 | 38 | #include <asm/hypervisor.h> |
302a3c0f | 39 | #include <asm/mshyperv.h> |
96c1d058 NM |
40 | #include <linux/notifier.h> |
41 | #include <linux/ptrace.h> | |
0f2a6619 | 42 | #include "hyperv_vmbus.h" |
3e7ee490 | 43 | |
607c1a11 | 44 | static struct acpi_device *hv_acpi_dev; |
1168ac22 | 45 | |
59c0e4f0 | 46 | static struct tasklet_struct msg_dpc; |
71a6655d | 47 | static struct completion probe_event; |
b0069f43 | 48 | static int irq; |
98db4335 | 49 | |
96c1d058 | 50 | |
ed99d846 | 51 | static int hyperv_panic_event(struct notifier_block *nb, |
96c1d058 NM |
52 | unsigned long event, void *ptr) |
53 | { | |
54 | struct pt_regs *regs; | |
55 | ||
56 | regs = current_pt_regs(); | |
57 | ||
58 | wrmsrl(HV_X64_MSR_CRASH_P0, regs->ip); | |
59 | wrmsrl(HV_X64_MSR_CRASH_P1, regs->ax); | |
60 | wrmsrl(HV_X64_MSR_CRASH_P2, regs->bx); | |
61 | wrmsrl(HV_X64_MSR_CRASH_P3, regs->cx); | |
62 | wrmsrl(HV_X64_MSR_CRASH_P4, regs->dx); | |
63 | ||
64 | /* | |
65 | * Let Hyper-V know there is crash data available | |
66 | */ | |
67 | wrmsrl(HV_X64_MSR_CRASH_CTL, HV_CRASH_CTL_CRASH_NOTIFY); | |
68 | return NOTIFY_DONE; | |
69 | } | |
70 | ||
71 | static struct notifier_block hyperv_panic_block = { | |
72 | .notifier_call = hyperv_panic_event, | |
73 | }; | |
74 | ||
90eedf0c GH |
75 | struct resource hyperv_mmio = { |
76 | .name = "hyperv mmio", | |
77 | .flags = IORESOURCE_MEM, | |
78 | }; | |
79 | EXPORT_SYMBOL_GPL(hyperv_mmio); | |
98db4335 | 80 | |
cf6a2eac S |
81 | static int vmbus_exists(void) |
82 | { | |
83 | if (hv_acpi_dev == NULL) | |
84 | return -ENODEV; | |
85 | ||
86 | return 0; | |
87 | } | |
88 | ||
fd776ba9 OH |
89 | #define VMBUS_ALIAS_LEN ((sizeof((struct hv_vmbus_device_id *)0)->guid) * 2) |
90 | static void print_alias_name(struct hv_device *hv_dev, char *alias_name) | |
91 | { | |
92 | int i; | |
93 | for (i = 0; i < VMBUS_ALIAS_LEN; i += 2) | |
94 | sprintf(&alias_name[i], "%02x", hv_dev->dev_type.b[i/2]); | |
95 | } | |
96 | ||
76c52bbe GKH |
97 | static u8 channel_monitor_group(struct vmbus_channel *channel) |
98 | { | |
99 | return (u8)channel->offermsg.monitorid / 32; | |
100 | } | |
101 | ||
102 | static u8 channel_monitor_offset(struct vmbus_channel *channel) | |
103 | { | |
104 | return (u8)channel->offermsg.monitorid % 32; | |
105 | } | |
106 | ||
107 | static u32 channel_pending(struct vmbus_channel *channel, | |
108 | struct hv_monitor_page *monitor_page) | |
109 | { | |
110 | u8 monitor_group = channel_monitor_group(channel); | |
111 | return monitor_page->trigger_group[monitor_group].pending; | |
112 | } | |
113 | ||
1cee272b GKH |
114 | static u32 channel_latency(struct vmbus_channel *channel, |
115 | struct hv_monitor_page *monitor_page) | |
116 | { | |
117 | u8 monitor_group = channel_monitor_group(channel); | |
118 | u8 monitor_offset = channel_monitor_offset(channel); | |
119 | return monitor_page->latency[monitor_group][monitor_offset]; | |
120 | } | |
121 | ||
4947c745 GKH |
122 | static u32 channel_conn_id(struct vmbus_channel *channel, |
123 | struct hv_monitor_page *monitor_page) | |
124 | { | |
125 | u8 monitor_group = channel_monitor_group(channel); | |
126 | u8 monitor_offset = channel_monitor_offset(channel); | |
127 | return monitor_page->parameter[monitor_group][monitor_offset].connectionid.u.id; | |
128 | } | |
129 | ||
03f3a910 GKH |
130 | static ssize_t id_show(struct device *dev, struct device_attribute *dev_attr, |
131 | char *buf) | |
132 | { | |
133 | struct hv_device *hv_dev = device_to_hv_device(dev); | |
134 | ||
135 | if (!hv_dev->channel) | |
136 | return -ENODEV; | |
137 | return sprintf(buf, "%d\n", hv_dev->channel->offermsg.child_relid); | |
138 | } | |
139 | static DEVICE_ATTR_RO(id); | |
140 | ||
a8fb5f3d GKH |
141 | static ssize_t state_show(struct device *dev, struct device_attribute *dev_attr, |
142 | 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, "%d\n", hv_dev->channel->state); | |
149 | } | |
150 | static DEVICE_ATTR_RO(state); | |
151 | ||
5ffd00e2 GKH |
152 | static ssize_t monitor_id_show(struct device *dev, |
153 | struct device_attribute *dev_attr, char *buf) | |
154 | { | |
155 | struct hv_device *hv_dev = device_to_hv_device(dev); | |
156 | ||
157 | if (!hv_dev->channel) | |
158 | return -ENODEV; | |
159 | return sprintf(buf, "%d\n", hv_dev->channel->offermsg.monitorid); | |
160 | } | |
161 | static DEVICE_ATTR_RO(monitor_id); | |
162 | ||
68234c04 GKH |
163 | static ssize_t class_id_show(struct device *dev, |
164 | struct device_attribute *dev_attr, char *buf) | |
165 | { | |
166 | struct hv_device *hv_dev = device_to_hv_device(dev); | |
167 | ||
168 | if (!hv_dev->channel) | |
169 | return -ENODEV; | |
170 | return sprintf(buf, "{%pUl}\n", | |
171 | hv_dev->channel->offermsg.offer.if_type.b); | |
172 | } | |
173 | static DEVICE_ATTR_RO(class_id); | |
174 | ||
7c55e1d0 GKH |
175 | static ssize_t device_id_show(struct device *dev, |
176 | struct device_attribute *dev_attr, char *buf) | |
177 | { | |
178 | struct hv_device *hv_dev = device_to_hv_device(dev); | |
179 | ||
180 | if (!hv_dev->channel) | |
181 | return -ENODEV; | |
182 | return sprintf(buf, "{%pUl}\n", | |
183 | hv_dev->channel->offermsg.offer.if_instance.b); | |
184 | } | |
185 | static DEVICE_ATTR_RO(device_id); | |
186 | ||
647fa371 GKH |
187 | static ssize_t modalias_show(struct device *dev, |
188 | struct device_attribute *dev_attr, char *buf) | |
189 | { | |
190 | struct hv_device *hv_dev = device_to_hv_device(dev); | |
191 | char alias_name[VMBUS_ALIAS_LEN + 1]; | |
192 | ||
193 | print_alias_name(hv_dev, alias_name); | |
194 | return sprintf(buf, "vmbus:%s\n", alias_name); | |
195 | } | |
196 | static DEVICE_ATTR_RO(modalias); | |
197 | ||
76c52bbe GKH |
198 | static ssize_t server_monitor_pending_show(struct device *dev, |
199 | struct device_attribute *dev_attr, | |
200 | char *buf) | |
201 | { | |
202 | struct hv_device *hv_dev = device_to_hv_device(dev); | |
203 | ||
204 | if (!hv_dev->channel) | |
205 | return -ENODEV; | |
206 | return sprintf(buf, "%d\n", | |
207 | channel_pending(hv_dev->channel, | |
208 | vmbus_connection.monitor_pages[1])); | |
209 | } | |
210 | static DEVICE_ATTR_RO(server_monitor_pending); | |
211 | ||
212 | static ssize_t client_monitor_pending_show(struct device *dev, | |
213 | struct device_attribute *dev_attr, | |
214 | char *buf) | |
215 | { | |
216 | struct hv_device *hv_dev = device_to_hv_device(dev); | |
217 | ||
218 | if (!hv_dev->channel) | |
219 | return -ENODEV; | |
220 | return sprintf(buf, "%d\n", | |
221 | channel_pending(hv_dev->channel, | |
222 | vmbus_connection.monitor_pages[1])); | |
223 | } | |
224 | static DEVICE_ATTR_RO(client_monitor_pending); | |
68234c04 | 225 | |
1cee272b GKH |
226 | static ssize_t server_monitor_latency_show(struct device *dev, |
227 | struct device_attribute *dev_attr, | |
228 | char *buf) | |
229 | { | |
230 | struct hv_device *hv_dev = device_to_hv_device(dev); | |
231 | ||
232 | if (!hv_dev->channel) | |
233 | return -ENODEV; | |
234 | return sprintf(buf, "%d\n", | |
235 | channel_latency(hv_dev->channel, | |
236 | vmbus_connection.monitor_pages[0])); | |
237 | } | |
238 | static DEVICE_ATTR_RO(server_monitor_latency); | |
239 | ||
240 | static ssize_t client_monitor_latency_show(struct device *dev, | |
241 | struct device_attribute *dev_attr, | |
242 | char *buf) | |
243 | { | |
244 | struct hv_device *hv_dev = device_to_hv_device(dev); | |
245 | ||
246 | if (!hv_dev->channel) | |
247 | return -ENODEV; | |
248 | return sprintf(buf, "%d\n", | |
249 | channel_latency(hv_dev->channel, | |
250 | vmbus_connection.monitor_pages[1])); | |
251 | } | |
252 | static DEVICE_ATTR_RO(client_monitor_latency); | |
253 | ||
4947c745 GKH |
254 | static ssize_t server_monitor_conn_id_show(struct device *dev, |
255 | struct device_attribute *dev_attr, | |
256 | char *buf) | |
257 | { | |
258 | struct hv_device *hv_dev = device_to_hv_device(dev); | |
259 | ||
260 | if (!hv_dev->channel) | |
261 | return -ENODEV; | |
262 | return sprintf(buf, "%d\n", | |
263 | channel_conn_id(hv_dev->channel, | |
264 | vmbus_connection.monitor_pages[0])); | |
265 | } | |
266 | static DEVICE_ATTR_RO(server_monitor_conn_id); | |
267 | ||
268 | static ssize_t client_monitor_conn_id_show(struct device *dev, | |
269 | struct device_attribute *dev_attr, | |
270 | char *buf) | |
271 | { | |
272 | struct hv_device *hv_dev = device_to_hv_device(dev); | |
273 | ||
274 | if (!hv_dev->channel) | |
275 | return -ENODEV; | |
276 | return sprintf(buf, "%d\n", | |
277 | channel_conn_id(hv_dev->channel, | |
278 | vmbus_connection.monitor_pages[1])); | |
279 | } | |
280 | static DEVICE_ATTR_RO(client_monitor_conn_id); | |
281 | ||
98f4c651 GKH |
282 | static ssize_t out_intr_mask_show(struct device *dev, |
283 | struct device_attribute *dev_attr, char *buf) | |
284 | { | |
285 | struct hv_device *hv_dev = device_to_hv_device(dev); | |
286 | struct hv_ring_buffer_debug_info outbound; | |
287 | ||
288 | if (!hv_dev->channel) | |
289 | return -ENODEV; | |
290 | hv_ringbuffer_get_debuginfo(&hv_dev->channel->outbound, &outbound); | |
291 | return sprintf(buf, "%d\n", outbound.current_interrupt_mask); | |
292 | } | |
293 | static DEVICE_ATTR_RO(out_intr_mask); | |
294 | ||
295 | static ssize_t out_read_index_show(struct device *dev, | |
296 | struct device_attribute *dev_attr, char *buf) | |
297 | { | |
298 | struct hv_device *hv_dev = device_to_hv_device(dev); | |
299 | struct hv_ring_buffer_debug_info outbound; | |
300 | ||
301 | if (!hv_dev->channel) | |
302 | return -ENODEV; | |
303 | hv_ringbuffer_get_debuginfo(&hv_dev->channel->outbound, &outbound); | |
304 | return sprintf(buf, "%d\n", outbound.current_read_index); | |
305 | } | |
306 | static DEVICE_ATTR_RO(out_read_index); | |
307 | ||
308 | static ssize_t out_write_index_show(struct device *dev, | |
309 | struct device_attribute *dev_attr, | |
310 | char *buf) | |
311 | { | |
312 | struct hv_device *hv_dev = device_to_hv_device(dev); | |
313 | struct hv_ring_buffer_debug_info outbound; | |
314 | ||
315 | if (!hv_dev->channel) | |
316 | return -ENODEV; | |
317 | hv_ringbuffer_get_debuginfo(&hv_dev->channel->outbound, &outbound); | |
318 | return sprintf(buf, "%d\n", outbound.current_write_index); | |
319 | } | |
320 | static DEVICE_ATTR_RO(out_write_index); | |
321 | ||
322 | static ssize_t out_read_bytes_avail_show(struct device *dev, | |
323 | struct device_attribute *dev_attr, | |
324 | char *buf) | |
325 | { | |
326 | struct hv_device *hv_dev = device_to_hv_device(dev); | |
327 | struct hv_ring_buffer_debug_info outbound; | |
328 | ||
329 | if (!hv_dev->channel) | |
330 | return -ENODEV; | |
331 | hv_ringbuffer_get_debuginfo(&hv_dev->channel->outbound, &outbound); | |
332 | return sprintf(buf, "%d\n", outbound.bytes_avail_toread); | |
333 | } | |
334 | static DEVICE_ATTR_RO(out_read_bytes_avail); | |
335 | ||
336 | static ssize_t out_write_bytes_avail_show(struct device *dev, | |
337 | struct device_attribute *dev_attr, | |
338 | char *buf) | |
339 | { | |
340 | struct hv_device *hv_dev = device_to_hv_device(dev); | |
341 | struct hv_ring_buffer_debug_info outbound; | |
342 | ||
343 | if (!hv_dev->channel) | |
344 | return -ENODEV; | |
345 | hv_ringbuffer_get_debuginfo(&hv_dev->channel->outbound, &outbound); | |
346 | return sprintf(buf, "%d\n", outbound.bytes_avail_towrite); | |
347 | } | |
348 | static DEVICE_ATTR_RO(out_write_bytes_avail); | |
349 | ||
350 | static ssize_t in_intr_mask_show(struct device *dev, | |
351 | struct device_attribute *dev_attr, char *buf) | |
352 | { | |
353 | struct hv_device *hv_dev = device_to_hv_device(dev); | |
354 | struct hv_ring_buffer_debug_info inbound; | |
355 | ||
356 | if (!hv_dev->channel) | |
357 | return -ENODEV; | |
358 | hv_ringbuffer_get_debuginfo(&hv_dev->channel->inbound, &inbound); | |
359 | return sprintf(buf, "%d\n", inbound.current_interrupt_mask); | |
360 | } | |
361 | static DEVICE_ATTR_RO(in_intr_mask); | |
362 | ||
363 | static ssize_t in_read_index_show(struct device *dev, | |
364 | struct device_attribute *dev_attr, char *buf) | |
365 | { | |
366 | struct hv_device *hv_dev = device_to_hv_device(dev); | |
367 | struct hv_ring_buffer_debug_info inbound; | |
368 | ||
369 | if (!hv_dev->channel) | |
370 | return -ENODEV; | |
371 | hv_ringbuffer_get_debuginfo(&hv_dev->channel->inbound, &inbound); | |
372 | return sprintf(buf, "%d\n", inbound.current_read_index); | |
373 | } | |
374 | static DEVICE_ATTR_RO(in_read_index); | |
375 | ||
376 | static ssize_t in_write_index_show(struct device *dev, | |
377 | struct device_attribute *dev_attr, char *buf) | |
378 | { | |
379 | struct hv_device *hv_dev = device_to_hv_device(dev); | |
380 | struct hv_ring_buffer_debug_info inbound; | |
381 | ||
382 | if (!hv_dev->channel) | |
383 | return -ENODEV; | |
384 | hv_ringbuffer_get_debuginfo(&hv_dev->channel->inbound, &inbound); | |
385 | return sprintf(buf, "%d\n", inbound.current_write_index); | |
386 | } | |
387 | static DEVICE_ATTR_RO(in_write_index); | |
388 | ||
389 | static ssize_t in_read_bytes_avail_show(struct device *dev, | |
390 | struct device_attribute *dev_attr, | |
391 | char *buf) | |
392 | { | |
393 | struct hv_device *hv_dev = device_to_hv_device(dev); | |
394 | struct hv_ring_buffer_debug_info inbound; | |
395 | ||
396 | if (!hv_dev->channel) | |
397 | return -ENODEV; | |
398 | hv_ringbuffer_get_debuginfo(&hv_dev->channel->inbound, &inbound); | |
399 | return sprintf(buf, "%d\n", inbound.bytes_avail_toread); | |
400 | } | |
401 | static DEVICE_ATTR_RO(in_read_bytes_avail); | |
402 | ||
403 | static ssize_t in_write_bytes_avail_show(struct device *dev, | |
404 | struct device_attribute *dev_attr, | |
405 | char *buf) | |
406 | { | |
407 | struct hv_device *hv_dev = device_to_hv_device(dev); | |
408 | struct hv_ring_buffer_debug_info inbound; | |
409 | ||
410 | if (!hv_dev->channel) | |
411 | return -ENODEV; | |
412 | hv_ringbuffer_get_debuginfo(&hv_dev->channel->inbound, &inbound); | |
413 | return sprintf(buf, "%d\n", inbound.bytes_avail_towrite); | |
414 | } | |
415 | static DEVICE_ATTR_RO(in_write_bytes_avail); | |
416 | ||
417 | /* Set up per device attributes in /sys/bus/vmbus/devices/<bus device> */ | |
03f3a910 GKH |
418 | static struct attribute *vmbus_attrs[] = { |
419 | &dev_attr_id.attr, | |
a8fb5f3d | 420 | &dev_attr_state.attr, |
5ffd00e2 | 421 | &dev_attr_monitor_id.attr, |
68234c04 | 422 | &dev_attr_class_id.attr, |
7c55e1d0 | 423 | &dev_attr_device_id.attr, |
647fa371 | 424 | &dev_attr_modalias.attr, |
76c52bbe GKH |
425 | &dev_attr_server_monitor_pending.attr, |
426 | &dev_attr_client_monitor_pending.attr, | |
1cee272b GKH |
427 | &dev_attr_server_monitor_latency.attr, |
428 | &dev_attr_client_monitor_latency.attr, | |
4947c745 GKH |
429 | &dev_attr_server_monitor_conn_id.attr, |
430 | &dev_attr_client_monitor_conn_id.attr, | |
98f4c651 GKH |
431 | &dev_attr_out_intr_mask.attr, |
432 | &dev_attr_out_read_index.attr, | |
433 | &dev_attr_out_write_index.attr, | |
434 | &dev_attr_out_read_bytes_avail.attr, | |
435 | &dev_attr_out_write_bytes_avail.attr, | |
436 | &dev_attr_in_intr_mask.attr, | |
437 | &dev_attr_in_read_index.attr, | |
438 | &dev_attr_in_write_index.attr, | |
439 | &dev_attr_in_read_bytes_avail.attr, | |
440 | &dev_attr_in_write_bytes_avail.attr, | |
03f3a910 GKH |
441 | NULL, |
442 | }; | |
443 | ATTRIBUTE_GROUPS(vmbus); | |
444 | ||
adde2487 S |
445 | /* |
446 | * vmbus_uevent - add uevent for our device | |
447 | * | |
448 | * This routine is invoked when a device is added or removed on the vmbus to | |
449 | * generate a uevent to udev in the userspace. The udev will then look at its | |
450 | * rule and the uevent generated here to load the appropriate driver | |
0ddda660 S |
451 | * |
452 | * The alias string will be of the form vmbus:guid where guid is the string | |
453 | * representation of the device guid (each byte of the guid will be | |
454 | * represented with two hex characters. | |
adde2487 S |
455 | */ |
456 | static int vmbus_uevent(struct device *device, struct kobj_uevent_env *env) | |
457 | { | |
458 | struct hv_device *dev = device_to_hv_device(device); | |
fd776ba9 OH |
459 | int ret; |
460 | char alias_name[VMBUS_ALIAS_LEN + 1]; | |
0ddda660 | 461 | |
fd776ba9 | 462 | print_alias_name(dev, alias_name); |
0ddda660 S |
463 | ret = add_uevent_var(env, "MODALIAS=vmbus:%s", alias_name); |
464 | return ret; | |
adde2487 S |
465 | } |
466 | ||
1b9d48f2 | 467 | static const uuid_le null_guid; |
5841a829 S |
468 | |
469 | static inline bool is_null_guid(const __u8 *guid) | |
470 | { | |
471 | if (memcmp(guid, &null_guid, sizeof(uuid_le))) | |
472 | return false; | |
473 | return true; | |
474 | } | |
475 | ||
3037a7b6 S |
476 | /* |
477 | * Return a matching hv_vmbus_device_id pointer. | |
478 | * If there is no match, return NULL. | |
479 | */ | |
480 | static const struct hv_vmbus_device_id *hv_vmbus_get_id( | |
481 | const struct hv_vmbus_device_id *id, | |
1b9d48f2 | 482 | const __u8 *guid) |
3037a7b6 S |
483 | { |
484 | for (; !is_null_guid(id->guid); id++) | |
485 | if (!memcmp(&id->guid, guid, sizeof(uuid_le))) | |
486 | return id; | |
487 | ||
488 | return NULL; | |
489 | } | |
490 | ||
491 | ||
b7fc147b S |
492 | |
493 | /* | |
494 | * vmbus_match - Attempt to match the specified device to the specified driver | |
495 | */ | |
496 | static int vmbus_match(struct device *device, struct device_driver *driver) | |
497 | { | |
b7fc147b | 498 | struct hv_driver *drv = drv_to_hv_drv(driver); |
e8e27047 | 499 | struct hv_device *hv_dev = device_to_hv_device(device); |
b7fc147b | 500 | |
3037a7b6 S |
501 | if (hv_vmbus_get_id(drv->id_table, hv_dev->dev_type.b)) |
502 | return 1; | |
de632a2b | 503 | |
5841a829 | 504 | return 0; |
b7fc147b S |
505 | } |
506 | ||
f1f0d67b S |
507 | /* |
508 | * vmbus_probe - Add the new vmbus's child device | |
509 | */ | |
510 | static int vmbus_probe(struct device *child_device) | |
511 | { | |
512 | int ret = 0; | |
513 | struct hv_driver *drv = | |
514 | drv_to_hv_drv(child_device->driver); | |
9efd21e1 | 515 | struct hv_device *dev = device_to_hv_device(child_device); |
84946899 | 516 | const struct hv_vmbus_device_id *dev_id; |
f1f0d67b | 517 | |
84946899 | 518 | dev_id = hv_vmbus_get_id(drv->id_table, dev->dev_type.b); |
9efd21e1 | 519 | if (drv->probe) { |
84946899 | 520 | ret = drv->probe(dev, dev_id); |
b14a7b30 | 521 | if (ret != 0) |
0a46618d HJ |
522 | pr_err("probe failed for device %s (%d)\n", |
523 | dev_name(child_device), ret); | |
f1f0d67b | 524 | |
f1f0d67b | 525 | } else { |
0a46618d HJ |
526 | pr_err("probe not set for driver %s\n", |
527 | dev_name(child_device)); | |
6de925b1 | 528 | ret = -ENODEV; |
f1f0d67b S |
529 | } |
530 | return ret; | |
531 | } | |
532 | ||
c5dce3db S |
533 | /* |
534 | * vmbus_remove - Remove a vmbus device | |
535 | */ | |
536 | static int vmbus_remove(struct device *child_device) | |
537 | { | |
d15a0301 | 538 | struct hv_driver *drv; |
415b023a | 539 | struct hv_device *dev = device_to_hv_device(child_device); |
ed6cfcc5 | 540 | u32 relid = dev->channel->offermsg.child_relid; |
c5dce3db | 541 | |
d15a0301 S |
542 | if (child_device->driver) { |
543 | drv = drv_to_hv_drv(child_device->driver); | |
544 | if (drv->remove) | |
545 | drv->remove(dev); | |
ed6cfcc5 S |
546 | else { |
547 | hv_process_channel_removal(dev->channel, relid); | |
d15a0301 S |
548 | pr_err("remove not set for driver %s\n", |
549 | dev_name(child_device)); | |
ed6cfcc5 S |
550 | } |
551 | } else { | |
552 | /* | |
553 | * We don't have a driver for this device; deal with the | |
554 | * rescind message by removing the channel. | |
555 | */ | |
556 | hv_process_channel_removal(dev->channel, relid); | |
d15a0301 | 557 | } |
c5dce3db S |
558 | |
559 | return 0; | |
560 | } | |
561 | ||
eb1bb259 S |
562 | |
563 | /* | |
564 | * vmbus_shutdown - Shutdown a vmbus device | |
565 | */ | |
566 | static void vmbus_shutdown(struct device *child_device) | |
567 | { | |
568 | struct hv_driver *drv; | |
ca6887fb | 569 | struct hv_device *dev = device_to_hv_device(child_device); |
eb1bb259 S |
570 | |
571 | ||
572 | /* The device may not be attached yet */ | |
573 | if (!child_device->driver) | |
574 | return; | |
575 | ||
576 | drv = drv_to_hv_drv(child_device->driver); | |
577 | ||
ca6887fb S |
578 | if (drv->shutdown) |
579 | drv->shutdown(dev); | |
eb1bb259 S |
580 | |
581 | return; | |
582 | } | |
583 | ||
086e7a56 S |
584 | |
585 | /* | |
586 | * vmbus_device_release - Final callback release of the vmbus child device | |
587 | */ | |
588 | static void vmbus_device_release(struct device *device) | |
589 | { | |
e8e27047 | 590 | struct hv_device *hv_dev = device_to_hv_device(device); |
086e7a56 | 591 | |
e8e27047 | 592 | kfree(hv_dev); |
086e7a56 S |
593 | |
594 | } | |
595 | ||
454f18a9 | 596 | /* The one and only one */ |
9adcac5c S |
597 | static struct bus_type hv_bus = { |
598 | .name = "vmbus", | |
599 | .match = vmbus_match, | |
600 | .shutdown = vmbus_shutdown, | |
601 | .remove = vmbus_remove, | |
602 | .probe = vmbus_probe, | |
603 | .uevent = vmbus_uevent, | |
03f3a910 | 604 | .dev_groups = vmbus_groups, |
3e7ee490 HJ |
605 | }; |
606 | ||
bf6506f6 TT |
607 | struct onmessage_work_context { |
608 | struct work_struct work; | |
609 | struct hv_message msg; | |
610 | }; | |
611 | ||
612 | static void vmbus_onmessage_work(struct work_struct *work) | |
613 | { | |
614 | struct onmessage_work_context *ctx; | |
615 | ||
09a19628 VK |
616 | /* Do not process messages if we're in DISCONNECTED state */ |
617 | if (vmbus_connection.conn_state == DISCONNECTED) | |
618 | return; | |
619 | ||
bf6506f6 TT |
620 | ctx = container_of(work, struct onmessage_work_context, |
621 | work); | |
622 | vmbus_onmessage(&ctx->msg); | |
623 | kfree(ctx); | |
624 | } | |
625 | ||
d8a60e00 | 626 | static void hv_process_timer_expiration(struct hv_message *msg, int cpu) |
4061ed9e S |
627 | { |
628 | struct clock_event_device *dev = hv_context.clk_evt[cpu]; | |
629 | ||
630 | if (dev->event_handler) | |
631 | dev->event_handler(dev); | |
632 | ||
633 | msg->header.message_type = HVMSG_NONE; | |
634 | ||
635 | /* | |
636 | * Make sure the write to MessageType (ie set to | |
637 | * HVMSG_NONE) happens before we read the | |
638 | * MessagePending and EOMing. Otherwise, the EOMing | |
639 | * will not deliver any more messages since there is | |
640 | * no empty slot | |
641 | */ | |
642 | mb(); | |
643 | ||
644 | if (msg->header.message_flags.msg_pending) { | |
645 | /* | |
646 | * This will cause message queue rescan to | |
647 | * possibly deliver another msg from the | |
648 | * hypervisor | |
649 | */ | |
650 | wrmsrl(HV_X64_MSR_EOM, 0); | |
651 | } | |
652 | } | |
653 | ||
62c1059d | 654 | static void vmbus_on_msg_dpc(unsigned long data) |
36199a99 GKH |
655 | { |
656 | int cpu = smp_processor_id(); | |
657 | void *page_addr = hv_context.synic_message_page[cpu]; | |
658 | struct hv_message *msg = (struct hv_message *)page_addr + | |
659 | VMBUS_MESSAGE_SINT; | |
652594c7 DC |
660 | struct vmbus_channel_message_header *hdr; |
661 | struct vmbus_channel_message_table_entry *entry; | |
bf6506f6 | 662 | struct onmessage_work_context *ctx; |
36199a99 GKH |
663 | |
664 | while (1) { | |
652594c7 | 665 | if (msg->header.message_type == HVMSG_NONE) |
36199a99 GKH |
666 | /* no msg */ |
667 | break; | |
652594c7 DC |
668 | |
669 | hdr = (struct vmbus_channel_message_header *)msg->u.payload; | |
670 | ||
671 | if (hdr->msgtype >= CHANNELMSG_COUNT) { | |
672 | WARN_ONCE(1, "unknown msgtype=%d\n", hdr->msgtype); | |
673 | goto msg_handled; | |
674 | } | |
675 | ||
676 | entry = &channel_message_table[hdr->msgtype]; | |
677 | if (entry->handler_type == VMHT_BLOCKING) { | |
bf6506f6 TT |
678 | ctx = kmalloc(sizeof(*ctx), GFP_ATOMIC); |
679 | if (ctx == NULL) | |
36199a99 | 680 | continue; |
652594c7 | 681 | |
bf6506f6 TT |
682 | INIT_WORK(&ctx->work, vmbus_onmessage_work); |
683 | memcpy(&ctx->msg, msg, sizeof(*msg)); | |
652594c7 | 684 | |
da9fcb72 | 685 | queue_work(vmbus_connection.work_queue, &ctx->work); |
652594c7 DC |
686 | } else |
687 | entry->message_handler(hdr); | |
36199a99 | 688 | |
652594c7 | 689 | msg_handled: |
36199a99 GKH |
690 | msg->header.message_type = HVMSG_NONE; |
691 | ||
692 | /* | |
693 | * Make sure the write to MessageType (ie set to | |
694 | * HVMSG_NONE) happens before we read the | |
695 | * MessagePending and EOMing. Otherwise, the EOMing | |
696 | * will not deliver any more messages since there is | |
697 | * no empty slot | |
698 | */ | |
35848f68 | 699 | mb(); |
36199a99 GKH |
700 | |
701 | if (msg->header.message_flags.msg_pending) { | |
702 | /* | |
703 | * This will cause message queue rescan to | |
704 | * possibly deliver another msg from the | |
705 | * hypervisor | |
706 | */ | |
707 | wrmsrl(HV_X64_MSR_EOM, 0); | |
708 | } | |
709 | } | |
710 | } | |
711 | ||
76d388cd | 712 | static void vmbus_isr(void) |
36199a99 | 713 | { |
36199a99 GKH |
714 | int cpu = smp_processor_id(); |
715 | void *page_addr; | |
716 | struct hv_message *msg; | |
717 | union hv_synic_event_flags *event; | |
ae4636e6 | 718 | bool handled = false; |
36199a99 | 719 | |
5ab05951 S |
720 | page_addr = hv_context.synic_event_page[cpu]; |
721 | if (page_addr == NULL) | |
76d388cd | 722 | return; |
5ab05951 S |
723 | |
724 | event = (union hv_synic_event_flags *)page_addr + | |
725 | VMBUS_MESSAGE_SINT; | |
7341d908 S |
726 | /* |
727 | * Check for events before checking for messages. This is the order | |
728 | * in which events and messages are checked in Windows guests on | |
729 | * Hyper-V, and the Windows team suggested we do the same. | |
730 | */ | |
36199a99 | 731 | |
6552ecd7 S |
732 | if ((vmbus_proto_version == VERSION_WS2008) || |
733 | (vmbus_proto_version == VERSION_WIN7)) { | |
36199a99 | 734 | |
6552ecd7 S |
735 | /* Since we are a child, we only need to check bit 0 */ |
736 | if (sync_test_and_clear_bit(0, | |
737 | (unsigned long *) &event->flags32[0])) { | |
738 | handled = true; | |
739 | } | |
740 | } else { | |
741 | /* | |
742 | * Our host is win8 or above. The signaling mechanism | |
743 | * has changed and we can directly look at the event page. | |
744 | * If bit n is set then we have an interrup on the channel | |
745 | * whose id is n. | |
746 | */ | |
ae4636e6 | 747 | handled = true; |
ae4636e6 | 748 | } |
793be9c7 | 749 | |
6552ecd7 | 750 | if (handled) |
db11f12a | 751 | tasklet_schedule(hv_context.event_dpc[cpu]); |
6552ecd7 S |
752 | |
753 | ||
7341d908 S |
754 | page_addr = hv_context.synic_message_page[cpu]; |
755 | msg = (struct hv_message *)page_addr + VMBUS_MESSAGE_SINT; | |
756 | ||
757 | /* Check if there are actual msgs to be processed */ | |
4061ed9e S |
758 | if (msg->header.message_type != HVMSG_NONE) { |
759 | if (msg->header.message_type == HVMSG_TIMER_EXPIRED) | |
760 | hv_process_timer_expiration(msg, cpu); | |
761 | else | |
762 | tasklet_schedule(&msg_dpc); | |
763 | } | |
793be9c7 S |
764 | } |
765 | ||
e513229b VK |
766 | #ifdef CONFIG_HOTPLUG_CPU |
767 | static int hyperv_cpu_disable(void) | |
768 | { | |
769 | return -ENOSYS; | |
770 | } | |
771 | ||
772 | static void hv_cpu_hotplug_quirk(bool vmbus_loaded) | |
773 | { | |
774 | static void *previous_cpu_disable; | |
775 | ||
776 | /* | |
777 | * Offlining a CPU when running on newer hypervisors (WS2012R2, Win8, | |
778 | * ...) is not supported at this moment as channel interrupts are | |
779 | * distributed across all of them. | |
780 | */ | |
781 | ||
782 | if ((vmbus_proto_version == VERSION_WS2008) || | |
783 | (vmbus_proto_version == VERSION_WIN7)) | |
784 | return; | |
785 | ||
786 | if (vmbus_loaded) { | |
787 | previous_cpu_disable = smp_ops.cpu_disable; | |
788 | smp_ops.cpu_disable = hyperv_cpu_disable; | |
789 | pr_notice("CPU offlining is not supported by hypervisor\n"); | |
790 | } else if (previous_cpu_disable) | |
791 | smp_ops.cpu_disable = previous_cpu_disable; | |
792 | } | |
793 | #else | |
794 | static void hv_cpu_hotplug_quirk(bool vmbus_loaded) | |
795 | { | |
796 | } | |
797 | #endif | |
798 | ||
3e189519 | 799 | /* |
90c9960e GKH |
800 | * vmbus_bus_init -Main vmbus driver initialization routine. |
801 | * | |
802 | * Here, we | |
0686e4f4 | 803 | * - initialize the vmbus driver context |
0686e4f4 LL |
804 | * - invoke the vmbus hv main init routine |
805 | * - get the irq resource | |
0686e4f4 | 806 | * - retrieve the channel offers |
90c9960e | 807 | */ |
9aaa995e | 808 | static int vmbus_bus_init(int irq) |
3e7ee490 | 809 | { |
90c9960e | 810 | int ret; |
3e7ee490 | 811 | |
6d26e38f GKH |
812 | /* Hypervisor initialization...setup hypercall page..etc */ |
813 | ret = hv_init(); | |
90c9960e | 814 | if (ret != 0) { |
0a46618d | 815 | pr_err("Unable to initialize the hypervisor - 0x%x\n", ret); |
d6c1c5de | 816 | return ret; |
3e7ee490 HJ |
817 | } |
818 | ||
59c0e4f0 | 819 | tasklet_init(&msg_dpc, vmbus_on_msg_dpc, 0); |
3e7ee490 | 820 | |
9adcac5c | 821 | ret = bus_register(&hv_bus); |
d6c1c5de | 822 | if (ret) |
8b9987e9 | 823 | goto err_cleanup; |
3e7ee490 | 824 | |
76d388cd | 825 | hv_setup_vmbus_irq(vmbus_isr); |
3e7ee490 | 826 | |
2608fb65 JW |
827 | ret = hv_synic_alloc(); |
828 | if (ret) | |
829 | goto err_alloc; | |
800b6902 | 830 | /* |
302a3c0f | 831 | * Initialize the per-cpu interrupt state and |
800b6902 S |
832 | * connect to the host. |
833 | */ | |
302a3c0f | 834 | on_each_cpu(hv_synic_init, NULL, 1); |
800b6902 | 835 | ret = vmbus_connect(); |
8b9987e9 | 836 | if (ret) |
2608fb65 | 837 | goto err_alloc; |
800b6902 | 838 | |
e513229b | 839 | hv_cpu_hotplug_quirk(true); |
96c1d058 NM |
840 | |
841 | /* | |
842 | * Only register if the crash MSRs are available | |
843 | */ | |
844 | if (ms_hyperv.features & HV_FEATURE_GUEST_CRASH_MSR_AVAILABLE) { | |
845 | atomic_notifier_chain_register(&panic_notifier_list, | |
846 | &hyperv_panic_block); | |
847 | } | |
848 | ||
2d6e882b | 849 | vmbus_request_offers(); |
8b5d6d3b | 850 | |
d6c1c5de | 851 | return 0; |
8b9987e9 | 852 | |
2608fb65 JW |
853 | err_alloc: |
854 | hv_synic_free(); | |
76d388cd | 855 | hv_remove_vmbus_irq(); |
8b9987e9 | 856 | |
8b9987e9 S |
857 | bus_unregister(&hv_bus); |
858 | ||
859 | err_cleanup: | |
860 | hv_cleanup(); | |
861 | ||
862 | return ret; | |
3e7ee490 HJ |
863 | } |
864 | ||
90c9960e | 865 | /** |
768fa219 GKH |
866 | * __vmbus_child_driver_register - Register a vmbus's driver |
867 | * @drv: Pointer to driver structure you want to register | |
868 | * @owner: owner module of the drv | |
869 | * @mod_name: module name string | |
3e189519 HJ |
870 | * |
871 | * Registers the given driver with Linux through the 'driver_register()' call | |
768fa219 | 872 | * and sets up the hyper-v vmbus handling for this driver. |
3e189519 HJ |
873 | * It will return the state of the 'driver_register()' call. |
874 | * | |
90c9960e | 875 | */ |
768fa219 | 876 | int __vmbus_driver_register(struct hv_driver *hv_driver, struct module *owner, const char *mod_name) |
3e7ee490 | 877 | { |
5d48a1c2 | 878 | int ret; |
3e7ee490 | 879 | |
768fa219 | 880 | pr_info("registering driver %s\n", hv_driver->name); |
3e7ee490 | 881 | |
cf6a2eac S |
882 | ret = vmbus_exists(); |
883 | if (ret < 0) | |
884 | return ret; | |
885 | ||
768fa219 GKH |
886 | hv_driver->driver.name = hv_driver->name; |
887 | hv_driver->driver.owner = owner; | |
888 | hv_driver->driver.mod_name = mod_name; | |
889 | hv_driver->driver.bus = &hv_bus; | |
3e7ee490 | 890 | |
768fa219 | 891 | ret = driver_register(&hv_driver->driver); |
3e7ee490 | 892 | |
5d48a1c2 | 893 | return ret; |
3e7ee490 | 894 | } |
768fa219 | 895 | EXPORT_SYMBOL_GPL(__vmbus_driver_register); |
3e7ee490 | 896 | |
90c9960e | 897 | /** |
768fa219 GKH |
898 | * vmbus_driver_unregister() - Unregister a vmbus's driver |
899 | * @drv: Pointer to driver structure you want to un-register | |
3e189519 | 900 | * |
768fa219 GKH |
901 | * Un-register the given driver that was previous registered with a call to |
902 | * vmbus_driver_register() | |
90c9960e | 903 | */ |
768fa219 | 904 | void vmbus_driver_unregister(struct hv_driver *hv_driver) |
3e7ee490 | 905 | { |
768fa219 | 906 | pr_info("unregistering driver %s\n", hv_driver->name); |
3e7ee490 | 907 | |
cf6a2eac | 908 | if (!vmbus_exists()) |
8f257a14 | 909 | driver_unregister(&hv_driver->driver); |
3e7ee490 | 910 | } |
768fa219 | 911 | EXPORT_SYMBOL_GPL(vmbus_driver_unregister); |
3e7ee490 | 912 | |
3e189519 | 913 | /* |
f2c73011 | 914 | * vmbus_device_create - Creates and registers a new child device |
3e189519 | 915 | * on the vmbus. |
90c9960e | 916 | */ |
1b9d48f2 | 917 | struct hv_device *vmbus_device_create(const uuid_le *type, |
918 | const uuid_le *instance, | |
919 | struct vmbus_channel *channel) | |
3e7ee490 | 920 | { |
3d3b5518 | 921 | struct hv_device *child_device_obj; |
3e7ee490 | 922 | |
6bad88da S |
923 | child_device_obj = kzalloc(sizeof(struct hv_device), GFP_KERNEL); |
924 | if (!child_device_obj) { | |
0a46618d | 925 | pr_err("Unable to allocate device object for child device\n"); |
3e7ee490 HJ |
926 | return NULL; |
927 | } | |
928 | ||
cae5b843 | 929 | child_device_obj->channel = channel; |
358d2ee2 | 930 | memcpy(&child_device_obj->dev_type, type, sizeof(uuid_le)); |
ca623ad3 | 931 | memcpy(&child_device_obj->dev_instance, instance, |
358d2ee2 | 932 | sizeof(uuid_le)); |
3e7ee490 | 933 | |
3e7ee490 | 934 | |
3e7ee490 HJ |
935 | return child_device_obj; |
936 | } | |
937 | ||
3e189519 | 938 | /* |
22794281 | 939 | * vmbus_device_register - Register the child device |
90c9960e | 940 | */ |
22794281 | 941 | int vmbus_device_register(struct hv_device *child_device_obj) |
3e7ee490 | 942 | { |
90c9960e | 943 | int ret = 0; |
6bad88da | 944 | |
bc63b6f6 VK |
945 | dev_set_name(&child_device_obj->device, "vmbus_%d", |
946 | child_device_obj->channel->id); | |
3e7ee490 | 947 | |
0bce28b6 | 948 | child_device_obj->device.bus = &hv_bus; |
607c1a11 | 949 | child_device_obj->device.parent = &hv_acpi_dev->dev; |
6bad88da | 950 | child_device_obj->device.release = vmbus_device_release; |
3e7ee490 | 951 | |
90c9960e GKH |
952 | /* |
953 | * Register with the LDM. This will kick off the driver/device | |
954 | * binding...which will eventually call vmbus_match() and vmbus_probe() | |
955 | */ | |
6bad88da | 956 | ret = device_register(&child_device_obj->device); |
3e7ee490 | 957 | |
3e7ee490 | 958 | if (ret) |
0a46618d | 959 | pr_err("Unable to register child device\n"); |
3e7ee490 | 960 | else |
84672369 | 961 | pr_debug("child device %s registered\n", |
0a46618d | 962 | dev_name(&child_device_obj->device)); |
3e7ee490 | 963 | |
3e7ee490 HJ |
964 | return ret; |
965 | } | |
966 | ||
3e189519 | 967 | /* |
696453ba | 968 | * vmbus_device_unregister - Remove the specified child device |
3e189519 | 969 | * from the vmbus. |
90c9960e | 970 | */ |
696453ba | 971 | void vmbus_device_unregister(struct hv_device *device_obj) |
3e7ee490 | 972 | { |
84672369 FS |
973 | pr_debug("child device %s unregistered\n", |
974 | dev_name(&device_obj->device)); | |
975 | ||
90c9960e GKH |
976 | /* |
977 | * Kick off the process of unregistering the device. | |
978 | * This will call vmbus_remove() and eventually vmbus_device_release() | |
979 | */ | |
6bad88da | 980 | device_unregister(&device_obj->device); |
3e7ee490 HJ |
981 | } |
982 | ||
3e7ee490 | 983 | |
b0069f43 | 984 | /* |
90f34535 S |
985 | * VMBUS is an acpi enumerated device. Get the the information we |
986 | * need from DSDT. | |
b0069f43 S |
987 | */ |
988 | ||
90f34535 | 989 | static acpi_status vmbus_walk_resources(struct acpi_resource *res, void *ctx) |
b0069f43 | 990 | { |
90f34535 S |
991 | switch (res->type) { |
992 | case ACPI_RESOURCE_TYPE_IRQ: | |
993 | irq = res->data.irq.interrupts[0]; | |
4eb923f8 | 994 | break; |
b0069f43 | 995 | |
90f34535 | 996 | case ACPI_RESOURCE_TYPE_ADDRESS64: |
a45de93e LZ |
997 | hyperv_mmio.start = res->data.address64.address.minimum; |
998 | hyperv_mmio.end = res->data.address64.address.maximum; | |
4eb923f8 | 999 | break; |
b0069f43 S |
1000 | } |
1001 | ||
1002 | return AE_OK; | |
1003 | } | |
1004 | ||
1005 | static int vmbus_acpi_add(struct acpi_device *device) | |
1006 | { | |
1007 | acpi_status result; | |
90f34535 | 1008 | int ret_val = -ENODEV; |
b0069f43 | 1009 | |
607c1a11 S |
1010 | hv_acpi_dev = device; |
1011 | ||
0a4425b6 | 1012 | result = acpi_walk_resources(device->handle, METHOD_NAME__CRS, |
90f34535 | 1013 | vmbus_walk_resources, NULL); |
b0069f43 | 1014 | |
90f34535 S |
1015 | if (ACPI_FAILURE(result)) |
1016 | goto acpi_walk_err; | |
1017 | /* | |
1018 | * The parent of the vmbus acpi device (Gen2 firmware) is the VMOD that | |
1019 | * has the mmio ranges. Get that. | |
1020 | */ | |
1021 | if (device->parent) { | |
1022 | result = acpi_walk_resources(device->parent->handle, | |
1023 | METHOD_NAME__CRS, | |
1024 | vmbus_walk_resources, NULL); | |
1025 | ||
1026 | if (ACPI_FAILURE(result)) | |
1027 | goto acpi_walk_err; | |
90eedf0c GH |
1028 | if (hyperv_mmio.start && hyperv_mmio.end) |
1029 | request_resource(&iomem_resource, &hyperv_mmio); | |
b0069f43 | 1030 | } |
90f34535 S |
1031 | ret_val = 0; |
1032 | ||
1033 | acpi_walk_err: | |
b0069f43 | 1034 | complete(&probe_event); |
90f34535 | 1035 | return ret_val; |
b0069f43 S |
1036 | } |
1037 | ||
e4ecb41c VK |
1038 | static int vmbus_acpi_remove(struct acpi_device *device) |
1039 | { | |
1040 | int ret = 0; | |
1041 | ||
1042 | if (hyperv_mmio.start && hyperv_mmio.end) | |
1043 | ret = release_resource(&hyperv_mmio); | |
1044 | return ret; | |
1045 | } | |
1046 | ||
b0069f43 S |
1047 | static const struct acpi_device_id vmbus_acpi_device_ids[] = { |
1048 | {"VMBUS", 0}, | |
9d7b18d1 | 1049 | {"VMBus", 0}, |
b0069f43 S |
1050 | {"", 0}, |
1051 | }; | |
1052 | MODULE_DEVICE_TABLE(acpi, vmbus_acpi_device_ids); | |
1053 | ||
1054 | static struct acpi_driver vmbus_acpi_driver = { | |
1055 | .name = "vmbus", | |
1056 | .ids = vmbus_acpi_device_ids, | |
1057 | .ops = { | |
1058 | .add = vmbus_acpi_add, | |
e4ecb41c | 1059 | .remove = vmbus_acpi_remove, |
b0069f43 S |
1060 | }, |
1061 | }; | |
1062 | ||
2517281d VK |
1063 | static void hv_kexec_handler(void) |
1064 | { | |
1065 | int cpu; | |
1066 | ||
1067 | hv_synic_clockevents_cleanup(); | |
1068 | vmbus_initiate_unload(); | |
1069 | for_each_online_cpu(cpu) | |
1070 | smp_call_function_single(cpu, hv_synic_cleanup, NULL, 1); | |
1071 | hv_cleanup(); | |
1072 | }; | |
1073 | ||
b4370df2 VK |
1074 | static void hv_crash_handler(struct pt_regs *regs) |
1075 | { | |
1076 | vmbus_initiate_unload(); | |
1077 | /* | |
1078 | * In crash handler we can't schedule synic cleanup for all CPUs, | |
1079 | * doing the cleanup for current CPU only. This should be sufficient | |
1080 | * for kdump. | |
1081 | */ | |
1082 | hv_synic_cleanup(NULL); | |
1083 | hv_cleanup(); | |
1084 | }; | |
1085 | ||
607c1a11 | 1086 | static int __init hv_acpi_init(void) |
1168ac22 | 1087 | { |
2dda95f8 | 1088 | int ret, t; |
b0069f43 | 1089 | |
1f94ea81 | 1090 | if (x86_hyper != &x86_hyper_ms_hyperv) |
0592969e JW |
1091 | return -ENODEV; |
1092 | ||
b0069f43 S |
1093 | init_completion(&probe_event); |
1094 | ||
1095 | /* | |
1096 | * Get irq resources first. | |
1097 | */ | |
0246604c S |
1098 | ret = acpi_bus_register_driver(&vmbus_acpi_driver); |
1099 | ||
b0069f43 S |
1100 | if (ret) |
1101 | return ret; | |
1102 | ||
2dda95f8 S |
1103 | t = wait_for_completion_timeout(&probe_event, 5*HZ); |
1104 | if (t == 0) { | |
1105 | ret = -ETIMEDOUT; | |
1106 | goto cleanup; | |
1107 | } | |
b0069f43 S |
1108 | |
1109 | if (irq <= 0) { | |
2dda95f8 S |
1110 | ret = -ENODEV; |
1111 | goto cleanup; | |
b0069f43 S |
1112 | } |
1113 | ||
91fd799e S |
1114 | ret = vmbus_bus_init(irq); |
1115 | if (ret) | |
2dda95f8 S |
1116 | goto cleanup; |
1117 | ||
2517281d | 1118 | hv_setup_kexec_handler(hv_kexec_handler); |
b4370df2 | 1119 | hv_setup_crash_handler(hv_crash_handler); |
2517281d | 1120 | |
2dda95f8 S |
1121 | return 0; |
1122 | ||
1123 | cleanup: | |
1124 | acpi_bus_unregister_driver(&vmbus_acpi_driver); | |
cf6a2eac | 1125 | hv_acpi_dev = NULL; |
91fd799e | 1126 | return ret; |
1168ac22 S |
1127 | } |
1128 | ||
93e5bd06 S |
1129 | static void __exit vmbus_exit(void) |
1130 | { | |
e72e7ac5 VK |
1131 | int cpu; |
1132 | ||
2517281d | 1133 | hv_remove_kexec_handler(); |
b4370df2 | 1134 | hv_remove_crash_handler(); |
09a19628 | 1135 | vmbus_connection.conn_state = DISCONNECTED; |
e086748c | 1136 | hv_synic_clockevents_cleanup(); |
2db84eff | 1137 | vmbus_disconnect(); |
76d388cd | 1138 | hv_remove_vmbus_irq(); |
1959a28e | 1139 | tasklet_kill(&msg_dpc); |
93e5bd06 | 1140 | vmbus_free_channels(); |
096c605f VK |
1141 | if (ms_hyperv.features & HV_FEATURE_GUEST_CRASH_MSR_AVAILABLE) { |
1142 | atomic_notifier_chain_unregister(&panic_notifier_list, | |
1143 | &hyperv_panic_block); | |
1144 | } | |
93e5bd06 S |
1145 | bus_unregister(&hv_bus); |
1146 | hv_cleanup(); | |
1959a28e VK |
1147 | for_each_online_cpu(cpu) { |
1148 | tasklet_kill(hv_context.event_dpc[cpu]); | |
e72e7ac5 | 1149 | smp_call_function_single(cpu, hv_synic_cleanup, NULL, 1); |
1959a28e | 1150 | } |
06210b42 | 1151 | hv_synic_free(); |
93e5bd06 | 1152 | acpi_bus_unregister_driver(&vmbus_acpi_driver); |
e513229b | 1153 | hv_cpu_hotplug_quirk(false); |
93e5bd06 S |
1154 | } |
1155 | ||
1168ac22 | 1156 | |
90c9960e | 1157 | MODULE_LICENSE("GPL"); |
3e7ee490 | 1158 | |
43d4e119 | 1159 | subsys_initcall(hv_acpi_init); |
93e5bd06 | 1160 | module_exit(vmbus_exit); |