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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> |
68db0cf1 IM |
37 | #include <linux/sched/task_stack.h> |
38 | ||
407dd164 | 39 | #include <asm/hyperv.h> |
1f94ea81 | 40 | #include <asm/hypervisor.h> |
302a3c0f | 41 | #include <asm/mshyperv.h> |
96c1d058 NM |
42 | #include <linux/notifier.h> |
43 | #include <linux/ptrace.h> | |
35464483 | 44 | #include <linux/screen_info.h> |
510f7aef | 45 | #include <linux/kdebug.h> |
6d146aef | 46 | #include <linux/efi.h> |
4b44f2d1 | 47 | #include <linux/random.h> |
0f2a6619 | 48 | #include "hyperv_vmbus.h" |
3e7ee490 | 49 | |
fc76936d SH |
50 | struct vmbus_dynid { |
51 | struct list_head node; | |
52 | struct hv_vmbus_device_id id; | |
53 | }; | |
54 | ||
607c1a11 | 55 | static struct acpi_device *hv_acpi_dev; |
1168ac22 | 56 | |
71a6655d | 57 | static struct completion probe_event; |
98db4335 | 58 | |
76d36ab7 | 59 | static int hyperv_cpuhp_online; |
96c1d058 | 60 | |
510f7aef VK |
61 | static int hyperv_panic_event(struct notifier_block *nb, unsigned long val, |
62 | void *args) | |
63 | { | |
64 | struct pt_regs *regs; | |
65 | ||
66 | regs = current_pt_regs(); | |
67 | ||
68 | hyperv_report_panic(regs); | |
96c1d058 NM |
69 | return NOTIFY_DONE; |
70 | } | |
71 | ||
510f7aef VK |
72 | static int hyperv_die_event(struct notifier_block *nb, unsigned long val, |
73 | void *args) | |
74 | { | |
75 | struct die_args *die = (struct die_args *)args; | |
76 | struct pt_regs *regs = die->regs; | |
77 | ||
78 | hyperv_report_panic(regs); | |
79 | return NOTIFY_DONE; | |
80 | } | |
81 | ||
82 | static struct notifier_block hyperv_die_block = { | |
83 | .notifier_call = hyperv_die_event, | |
84 | }; | |
96c1d058 NM |
85 | static struct notifier_block hyperv_panic_block = { |
86 | .notifier_call = hyperv_panic_event, | |
87 | }; | |
88 | ||
6d146aef JO |
89 | static const char *fb_mmio_name = "fb_range"; |
90 | static struct resource *fb_mmio; | |
e2e80841 SH |
91 | static struct resource *hyperv_mmio; |
92 | static DEFINE_SEMAPHORE(hyperv_mmio_lock); | |
98db4335 | 93 | |
cf6a2eac S |
94 | static int vmbus_exists(void) |
95 | { | |
96 | if (hv_acpi_dev == NULL) | |
97 | return -ENODEV; | |
98 | ||
99 | return 0; | |
100 | } | |
101 | ||
fd776ba9 OH |
102 | #define VMBUS_ALIAS_LEN ((sizeof((struct hv_vmbus_device_id *)0)->guid) * 2) |
103 | static void print_alias_name(struct hv_device *hv_dev, char *alias_name) | |
104 | { | |
105 | int i; | |
106 | for (i = 0; i < VMBUS_ALIAS_LEN; i += 2) | |
107 | sprintf(&alias_name[i], "%02x", hv_dev->dev_type.b[i/2]); | |
108 | } | |
109 | ||
76c52bbe GKH |
110 | static u8 channel_monitor_group(struct vmbus_channel *channel) |
111 | { | |
112 | return (u8)channel->offermsg.monitorid / 32; | |
113 | } | |
114 | ||
115 | static u8 channel_monitor_offset(struct vmbus_channel *channel) | |
116 | { | |
117 | return (u8)channel->offermsg.monitorid % 32; | |
118 | } | |
119 | ||
120 | static u32 channel_pending(struct vmbus_channel *channel, | |
121 | struct hv_monitor_page *monitor_page) | |
122 | { | |
123 | u8 monitor_group = channel_monitor_group(channel); | |
124 | return monitor_page->trigger_group[monitor_group].pending; | |
125 | } | |
126 | ||
1cee272b GKH |
127 | static u32 channel_latency(struct vmbus_channel *channel, |
128 | struct hv_monitor_page *monitor_page) | |
129 | { | |
130 | u8 monitor_group = channel_monitor_group(channel); | |
131 | u8 monitor_offset = channel_monitor_offset(channel); | |
132 | return monitor_page->latency[monitor_group][monitor_offset]; | |
133 | } | |
134 | ||
4947c745 GKH |
135 | static u32 channel_conn_id(struct vmbus_channel *channel, |
136 | struct hv_monitor_page *monitor_page) | |
137 | { | |
138 | u8 monitor_group = channel_monitor_group(channel); | |
139 | u8 monitor_offset = channel_monitor_offset(channel); | |
140 | return monitor_page->parameter[monitor_group][monitor_offset].connectionid.u.id; | |
141 | } | |
142 | ||
03f3a910 GKH |
143 | static ssize_t id_show(struct device *dev, struct device_attribute *dev_attr, |
144 | char *buf) | |
145 | { | |
146 | struct hv_device *hv_dev = device_to_hv_device(dev); | |
147 | ||
148 | if (!hv_dev->channel) | |
149 | return -ENODEV; | |
150 | return sprintf(buf, "%d\n", hv_dev->channel->offermsg.child_relid); | |
151 | } | |
152 | static DEVICE_ATTR_RO(id); | |
153 | ||
a8fb5f3d GKH |
154 | static ssize_t state_show(struct device *dev, struct device_attribute *dev_attr, |
155 | char *buf) | |
156 | { | |
157 | struct hv_device *hv_dev = device_to_hv_device(dev); | |
158 | ||
159 | if (!hv_dev->channel) | |
160 | return -ENODEV; | |
161 | return sprintf(buf, "%d\n", hv_dev->channel->state); | |
162 | } | |
163 | static DEVICE_ATTR_RO(state); | |
164 | ||
5ffd00e2 GKH |
165 | static ssize_t monitor_id_show(struct device *dev, |
166 | struct device_attribute *dev_attr, 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", hv_dev->channel->offermsg.monitorid); | |
173 | } | |
174 | static DEVICE_ATTR_RO(monitor_id); | |
175 | ||
68234c04 GKH |
176 | static ssize_t class_id_show(struct device *dev, |
177 | struct device_attribute *dev_attr, char *buf) | |
178 | { | |
179 | struct hv_device *hv_dev = device_to_hv_device(dev); | |
180 | ||
181 | if (!hv_dev->channel) | |
182 | return -ENODEV; | |
183 | return sprintf(buf, "{%pUl}\n", | |
184 | hv_dev->channel->offermsg.offer.if_type.b); | |
185 | } | |
186 | static DEVICE_ATTR_RO(class_id); | |
187 | ||
7c55e1d0 GKH |
188 | static ssize_t device_id_show(struct device *dev, |
189 | struct device_attribute *dev_attr, char *buf) | |
190 | { | |
191 | struct hv_device *hv_dev = device_to_hv_device(dev); | |
192 | ||
193 | if (!hv_dev->channel) | |
194 | return -ENODEV; | |
195 | return sprintf(buf, "{%pUl}\n", | |
196 | hv_dev->channel->offermsg.offer.if_instance.b); | |
197 | } | |
198 | static DEVICE_ATTR_RO(device_id); | |
199 | ||
647fa371 GKH |
200 | static ssize_t modalias_show(struct device *dev, |
201 | struct device_attribute *dev_attr, char *buf) | |
202 | { | |
203 | struct hv_device *hv_dev = device_to_hv_device(dev); | |
204 | char alias_name[VMBUS_ALIAS_LEN + 1]; | |
205 | ||
206 | print_alias_name(hv_dev, alias_name); | |
207 | return sprintf(buf, "vmbus:%s\n", alias_name); | |
208 | } | |
209 | static DEVICE_ATTR_RO(modalias); | |
210 | ||
76c52bbe GKH |
211 | static ssize_t server_monitor_pending_show(struct device *dev, |
212 | struct device_attribute *dev_attr, | |
213 | char *buf) | |
214 | { | |
215 | struct hv_device *hv_dev = device_to_hv_device(dev); | |
216 | ||
217 | if (!hv_dev->channel) | |
218 | return -ENODEV; | |
219 | return sprintf(buf, "%d\n", | |
220 | channel_pending(hv_dev->channel, | |
221 | vmbus_connection.monitor_pages[1])); | |
222 | } | |
223 | static DEVICE_ATTR_RO(server_monitor_pending); | |
224 | ||
225 | static ssize_t client_monitor_pending_show(struct device *dev, | |
226 | struct device_attribute *dev_attr, | |
227 | char *buf) | |
228 | { | |
229 | struct hv_device *hv_dev = device_to_hv_device(dev); | |
230 | ||
231 | if (!hv_dev->channel) | |
232 | return -ENODEV; | |
233 | return sprintf(buf, "%d\n", | |
234 | channel_pending(hv_dev->channel, | |
235 | vmbus_connection.monitor_pages[1])); | |
236 | } | |
237 | static DEVICE_ATTR_RO(client_monitor_pending); | |
68234c04 | 238 | |
1cee272b GKH |
239 | static ssize_t server_monitor_latency_show(struct device *dev, |
240 | struct device_attribute *dev_attr, | |
241 | char *buf) | |
242 | { | |
243 | struct hv_device *hv_dev = device_to_hv_device(dev); | |
244 | ||
245 | if (!hv_dev->channel) | |
246 | return -ENODEV; | |
247 | return sprintf(buf, "%d\n", | |
248 | channel_latency(hv_dev->channel, | |
249 | vmbus_connection.monitor_pages[0])); | |
250 | } | |
251 | static DEVICE_ATTR_RO(server_monitor_latency); | |
252 | ||
253 | static ssize_t client_monitor_latency_show(struct device *dev, | |
254 | struct device_attribute *dev_attr, | |
255 | char *buf) | |
256 | { | |
257 | struct hv_device *hv_dev = device_to_hv_device(dev); | |
258 | ||
259 | if (!hv_dev->channel) | |
260 | return -ENODEV; | |
261 | return sprintf(buf, "%d\n", | |
262 | channel_latency(hv_dev->channel, | |
263 | vmbus_connection.monitor_pages[1])); | |
264 | } | |
265 | static DEVICE_ATTR_RO(client_monitor_latency); | |
266 | ||
4947c745 GKH |
267 | static ssize_t server_monitor_conn_id_show(struct device *dev, |
268 | struct device_attribute *dev_attr, | |
269 | char *buf) | |
270 | { | |
271 | struct hv_device *hv_dev = device_to_hv_device(dev); | |
272 | ||
273 | if (!hv_dev->channel) | |
274 | return -ENODEV; | |
275 | return sprintf(buf, "%d\n", | |
276 | channel_conn_id(hv_dev->channel, | |
277 | vmbus_connection.monitor_pages[0])); | |
278 | } | |
279 | static DEVICE_ATTR_RO(server_monitor_conn_id); | |
280 | ||
281 | static ssize_t client_monitor_conn_id_show(struct device *dev, | |
282 | struct device_attribute *dev_attr, | |
283 | char *buf) | |
284 | { | |
285 | struct hv_device *hv_dev = device_to_hv_device(dev); | |
286 | ||
287 | if (!hv_dev->channel) | |
288 | return -ENODEV; | |
289 | return sprintf(buf, "%d\n", | |
290 | channel_conn_id(hv_dev->channel, | |
291 | vmbus_connection.monitor_pages[1])); | |
292 | } | |
293 | static DEVICE_ATTR_RO(client_monitor_conn_id); | |
294 | ||
98f4c651 GKH |
295 | static ssize_t out_intr_mask_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_interrupt_mask); | |
305 | } | |
306 | static DEVICE_ATTR_RO(out_intr_mask); | |
307 | ||
308 | static ssize_t out_read_index_show(struct device *dev, | |
309 | struct device_attribute *dev_attr, char *buf) | |
310 | { | |
311 | struct hv_device *hv_dev = device_to_hv_device(dev); | |
312 | struct hv_ring_buffer_debug_info outbound; | |
313 | ||
314 | if (!hv_dev->channel) | |
315 | return -ENODEV; | |
316 | hv_ringbuffer_get_debuginfo(&hv_dev->channel->outbound, &outbound); | |
317 | return sprintf(buf, "%d\n", outbound.current_read_index); | |
318 | } | |
319 | static DEVICE_ATTR_RO(out_read_index); | |
320 | ||
321 | static ssize_t out_write_index_show(struct device *dev, | |
322 | struct device_attribute *dev_attr, | |
323 | char *buf) | |
324 | { | |
325 | struct hv_device *hv_dev = device_to_hv_device(dev); | |
326 | struct hv_ring_buffer_debug_info outbound; | |
327 | ||
328 | if (!hv_dev->channel) | |
329 | return -ENODEV; | |
330 | hv_ringbuffer_get_debuginfo(&hv_dev->channel->outbound, &outbound); | |
331 | return sprintf(buf, "%d\n", outbound.current_write_index); | |
332 | } | |
333 | static DEVICE_ATTR_RO(out_write_index); | |
334 | ||
335 | static ssize_t out_read_bytes_avail_show(struct device *dev, | |
336 | struct device_attribute *dev_attr, | |
337 | char *buf) | |
338 | { | |
339 | struct hv_device *hv_dev = device_to_hv_device(dev); | |
340 | struct hv_ring_buffer_debug_info outbound; | |
341 | ||
342 | if (!hv_dev->channel) | |
343 | return -ENODEV; | |
344 | hv_ringbuffer_get_debuginfo(&hv_dev->channel->outbound, &outbound); | |
345 | return sprintf(buf, "%d\n", outbound.bytes_avail_toread); | |
346 | } | |
347 | static DEVICE_ATTR_RO(out_read_bytes_avail); | |
348 | ||
349 | static ssize_t out_write_bytes_avail_show(struct device *dev, | |
350 | struct device_attribute *dev_attr, | |
351 | char *buf) | |
352 | { | |
353 | struct hv_device *hv_dev = device_to_hv_device(dev); | |
354 | struct hv_ring_buffer_debug_info outbound; | |
355 | ||
356 | if (!hv_dev->channel) | |
357 | return -ENODEV; | |
358 | hv_ringbuffer_get_debuginfo(&hv_dev->channel->outbound, &outbound); | |
359 | return sprintf(buf, "%d\n", outbound.bytes_avail_towrite); | |
360 | } | |
361 | static DEVICE_ATTR_RO(out_write_bytes_avail); | |
362 | ||
363 | static ssize_t in_intr_mask_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_interrupt_mask); | |
373 | } | |
374 | static DEVICE_ATTR_RO(in_intr_mask); | |
375 | ||
376 | static ssize_t in_read_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_read_index); | |
386 | } | |
387 | static DEVICE_ATTR_RO(in_read_index); | |
388 | ||
389 | static ssize_t in_write_index_show(struct device *dev, | |
390 | struct device_attribute *dev_attr, char *buf) | |
391 | { | |
392 | struct hv_device *hv_dev = device_to_hv_device(dev); | |
393 | struct hv_ring_buffer_debug_info inbound; | |
394 | ||
395 | if (!hv_dev->channel) | |
396 | return -ENODEV; | |
397 | hv_ringbuffer_get_debuginfo(&hv_dev->channel->inbound, &inbound); | |
398 | return sprintf(buf, "%d\n", inbound.current_write_index); | |
399 | } | |
400 | static DEVICE_ATTR_RO(in_write_index); | |
401 | ||
402 | static ssize_t in_read_bytes_avail_show(struct device *dev, | |
403 | struct device_attribute *dev_attr, | |
404 | char *buf) | |
405 | { | |
406 | struct hv_device *hv_dev = device_to_hv_device(dev); | |
407 | struct hv_ring_buffer_debug_info inbound; | |
408 | ||
409 | if (!hv_dev->channel) | |
410 | return -ENODEV; | |
411 | hv_ringbuffer_get_debuginfo(&hv_dev->channel->inbound, &inbound); | |
412 | return sprintf(buf, "%d\n", inbound.bytes_avail_toread); | |
413 | } | |
414 | static DEVICE_ATTR_RO(in_read_bytes_avail); | |
415 | ||
416 | static ssize_t in_write_bytes_avail_show(struct device *dev, | |
417 | struct device_attribute *dev_attr, | |
418 | char *buf) | |
419 | { | |
420 | struct hv_device *hv_dev = device_to_hv_device(dev); | |
421 | struct hv_ring_buffer_debug_info inbound; | |
422 | ||
423 | if (!hv_dev->channel) | |
424 | return -ENODEV; | |
425 | hv_ringbuffer_get_debuginfo(&hv_dev->channel->inbound, &inbound); | |
426 | return sprintf(buf, "%d\n", inbound.bytes_avail_towrite); | |
427 | } | |
428 | static DEVICE_ATTR_RO(in_write_bytes_avail); | |
429 | ||
042ab031 DC |
430 | static ssize_t channel_vp_mapping_show(struct device *dev, |
431 | struct device_attribute *dev_attr, | |
432 | char *buf) | |
433 | { | |
434 | struct hv_device *hv_dev = device_to_hv_device(dev); | |
435 | struct vmbus_channel *channel = hv_dev->channel, *cur_sc; | |
436 | unsigned long flags; | |
437 | int buf_size = PAGE_SIZE, n_written, tot_written; | |
438 | struct list_head *cur; | |
439 | ||
440 | if (!channel) | |
441 | return -ENODEV; | |
442 | ||
443 | tot_written = snprintf(buf, buf_size, "%u:%u\n", | |
444 | channel->offermsg.child_relid, channel->target_cpu); | |
445 | ||
446 | spin_lock_irqsave(&channel->lock, flags); | |
447 | ||
448 | list_for_each(cur, &channel->sc_list) { | |
449 | if (tot_written >= buf_size - 1) | |
450 | break; | |
451 | ||
452 | cur_sc = list_entry(cur, struct vmbus_channel, sc_list); | |
453 | n_written = scnprintf(buf + tot_written, | |
454 | buf_size - tot_written, | |
455 | "%u:%u\n", | |
456 | cur_sc->offermsg.child_relid, | |
457 | cur_sc->target_cpu); | |
458 | tot_written += n_written; | |
459 | } | |
460 | ||
461 | spin_unlock_irqrestore(&channel->lock, flags); | |
462 | ||
463 | return tot_written; | |
464 | } | |
465 | static DEVICE_ATTR_RO(channel_vp_mapping); | |
466 | ||
7047f17d S |
467 | static ssize_t vendor_show(struct device *dev, |
468 | struct device_attribute *dev_attr, | |
469 | char *buf) | |
470 | { | |
471 | struct hv_device *hv_dev = device_to_hv_device(dev); | |
472 | return sprintf(buf, "0x%x\n", hv_dev->vendor_id); | |
473 | } | |
474 | static DEVICE_ATTR_RO(vendor); | |
475 | ||
476 | static ssize_t device_show(struct device *dev, | |
477 | struct device_attribute *dev_attr, | |
478 | char *buf) | |
479 | { | |
480 | struct hv_device *hv_dev = device_to_hv_device(dev); | |
481 | return sprintf(buf, "0x%x\n", hv_dev->device_id); | |
482 | } | |
483 | static DEVICE_ATTR_RO(device); | |
484 | ||
98f4c651 | 485 | /* Set up per device attributes in /sys/bus/vmbus/devices/<bus device> */ |
fc76936d | 486 | static struct attribute *vmbus_dev_attrs[] = { |
03f3a910 | 487 | &dev_attr_id.attr, |
a8fb5f3d | 488 | &dev_attr_state.attr, |
5ffd00e2 | 489 | &dev_attr_monitor_id.attr, |
68234c04 | 490 | &dev_attr_class_id.attr, |
7c55e1d0 | 491 | &dev_attr_device_id.attr, |
647fa371 | 492 | &dev_attr_modalias.attr, |
76c52bbe GKH |
493 | &dev_attr_server_monitor_pending.attr, |
494 | &dev_attr_client_monitor_pending.attr, | |
1cee272b GKH |
495 | &dev_attr_server_monitor_latency.attr, |
496 | &dev_attr_client_monitor_latency.attr, | |
4947c745 GKH |
497 | &dev_attr_server_monitor_conn_id.attr, |
498 | &dev_attr_client_monitor_conn_id.attr, | |
98f4c651 GKH |
499 | &dev_attr_out_intr_mask.attr, |
500 | &dev_attr_out_read_index.attr, | |
501 | &dev_attr_out_write_index.attr, | |
502 | &dev_attr_out_read_bytes_avail.attr, | |
503 | &dev_attr_out_write_bytes_avail.attr, | |
504 | &dev_attr_in_intr_mask.attr, | |
505 | &dev_attr_in_read_index.attr, | |
506 | &dev_attr_in_write_index.attr, | |
507 | &dev_attr_in_read_bytes_avail.attr, | |
508 | &dev_attr_in_write_bytes_avail.attr, | |
042ab031 | 509 | &dev_attr_channel_vp_mapping.attr, |
7047f17d S |
510 | &dev_attr_vendor.attr, |
511 | &dev_attr_device.attr, | |
03f3a910 GKH |
512 | NULL, |
513 | }; | |
fc76936d | 514 | ATTRIBUTE_GROUPS(vmbus_dev); |
03f3a910 | 515 | |
adde2487 S |
516 | /* |
517 | * vmbus_uevent - add uevent for our device | |
518 | * | |
519 | * This routine is invoked when a device is added or removed on the vmbus to | |
520 | * generate a uevent to udev in the userspace. The udev will then look at its | |
521 | * rule and the uevent generated here to load the appropriate driver | |
0ddda660 S |
522 | * |
523 | * The alias string will be of the form vmbus:guid where guid is the string | |
524 | * representation of the device guid (each byte of the guid will be | |
525 | * represented with two hex characters. | |
adde2487 S |
526 | */ |
527 | static int vmbus_uevent(struct device *device, struct kobj_uevent_env *env) | |
528 | { | |
529 | struct hv_device *dev = device_to_hv_device(device); | |
fd776ba9 OH |
530 | int ret; |
531 | char alias_name[VMBUS_ALIAS_LEN + 1]; | |
0ddda660 | 532 | |
fd776ba9 | 533 | print_alias_name(dev, alias_name); |
0ddda660 S |
534 | ret = add_uevent_var(env, "MODALIAS=vmbus:%s", alias_name); |
535 | return ret; | |
adde2487 S |
536 | } |
537 | ||
1b9d48f2 | 538 | static const uuid_le null_guid; |
5841a829 | 539 | |
af3ff643 | 540 | static inline bool is_null_guid(const uuid_le *guid) |
5841a829 | 541 | { |
4ae92508 | 542 | if (uuid_le_cmp(*guid, null_guid)) |
5841a829 S |
543 | return false; |
544 | return true; | |
545 | } | |
546 | ||
3037a7b6 S |
547 | /* |
548 | * Return a matching hv_vmbus_device_id pointer. | |
549 | * If there is no match, return NULL. | |
550 | */ | |
fc76936d | 551 | static const struct hv_vmbus_device_id *hv_vmbus_get_id(struct hv_driver *drv, |
af3ff643 | 552 | const uuid_le *guid) |
3037a7b6 | 553 | { |
fc76936d SH |
554 | const struct hv_vmbus_device_id *id = NULL; |
555 | struct vmbus_dynid *dynid; | |
556 | ||
557 | /* Look at the dynamic ids first, before the static ones */ | |
558 | spin_lock(&drv->dynids.lock); | |
559 | list_for_each_entry(dynid, &drv->dynids.list, node) { | |
560 | if (!uuid_le_cmp(dynid->id.guid, *guid)) { | |
561 | id = &dynid->id; | |
562 | break; | |
563 | } | |
564 | } | |
565 | spin_unlock(&drv->dynids.lock); | |
566 | ||
567 | if (id) | |
568 | return id; | |
569 | ||
570 | id = drv->id_table; | |
571 | if (id == NULL) | |
572 | return NULL; /* empty device table */ | |
573 | ||
af3ff643 | 574 | for (; !is_null_guid(&id->guid); id++) |
4ae92508 | 575 | if (!uuid_le_cmp(id->guid, *guid)) |
3037a7b6 S |
576 | return id; |
577 | ||
578 | return NULL; | |
579 | } | |
580 | ||
fc76936d SH |
581 | /* vmbus_add_dynid - add a new device ID to this driver and re-probe devices */ |
582 | static int vmbus_add_dynid(struct hv_driver *drv, uuid_le *guid) | |
583 | { | |
584 | struct vmbus_dynid *dynid; | |
585 | ||
586 | dynid = kzalloc(sizeof(*dynid), GFP_KERNEL); | |
587 | if (!dynid) | |
588 | return -ENOMEM; | |
589 | ||
590 | dynid->id.guid = *guid; | |
591 | ||
592 | spin_lock(&drv->dynids.lock); | |
593 | list_add_tail(&dynid->node, &drv->dynids.list); | |
594 | spin_unlock(&drv->dynids.lock); | |
595 | ||
596 | return driver_attach(&drv->driver); | |
597 | } | |
598 | ||
599 | static void vmbus_free_dynids(struct hv_driver *drv) | |
600 | { | |
601 | struct vmbus_dynid *dynid, *n; | |
602 | ||
603 | spin_lock(&drv->dynids.lock); | |
604 | list_for_each_entry_safe(dynid, n, &drv->dynids.list, node) { | |
605 | list_del(&dynid->node); | |
606 | kfree(dynid); | |
607 | } | |
608 | spin_unlock(&drv->dynids.lock); | |
609 | } | |
610 | ||
fc76936d SH |
611 | /* |
612 | * store_new_id - sysfs frontend to vmbus_add_dynid() | |
613 | * | |
614 | * Allow GUIDs to be added to an existing driver via sysfs. | |
615 | */ | |
616 | static ssize_t new_id_store(struct device_driver *driver, const char *buf, | |
617 | size_t count) | |
618 | { | |
619 | struct hv_driver *drv = drv_to_hv_drv(driver); | |
31100108 | 620 | uuid_le guid; |
fc76936d SH |
621 | ssize_t retval; |
622 | ||
31100108 AS |
623 | retval = uuid_le_to_bin(buf, &guid); |
624 | if (retval) | |
625 | return retval; | |
fc76936d SH |
626 | |
627 | if (hv_vmbus_get_id(drv, &guid)) | |
628 | return -EEXIST; | |
629 | ||
630 | retval = vmbus_add_dynid(drv, &guid); | |
631 | if (retval) | |
632 | return retval; | |
633 | return count; | |
634 | } | |
635 | static DRIVER_ATTR_WO(new_id); | |
636 | ||
637 | /* | |
638 | * store_remove_id - remove a PCI device ID from this driver | |
639 | * | |
640 | * Removes a dynamic pci device ID to this driver. | |
641 | */ | |
642 | static ssize_t remove_id_store(struct device_driver *driver, const char *buf, | |
643 | size_t count) | |
644 | { | |
645 | struct hv_driver *drv = drv_to_hv_drv(driver); | |
646 | struct vmbus_dynid *dynid, *n; | |
31100108 AS |
647 | uuid_le guid; |
648 | ssize_t retval; | |
fc76936d | 649 | |
31100108 AS |
650 | retval = uuid_le_to_bin(buf, &guid); |
651 | if (retval) | |
652 | return retval; | |
fc76936d | 653 | |
31100108 | 654 | retval = -ENODEV; |
fc76936d SH |
655 | spin_lock(&drv->dynids.lock); |
656 | list_for_each_entry_safe(dynid, n, &drv->dynids.list, node) { | |
657 | struct hv_vmbus_device_id *id = &dynid->id; | |
658 | ||
659 | if (!uuid_le_cmp(id->guid, guid)) { | |
660 | list_del(&dynid->node); | |
661 | kfree(dynid); | |
662 | retval = count; | |
663 | break; | |
664 | } | |
665 | } | |
666 | spin_unlock(&drv->dynids.lock); | |
667 | ||
668 | return retval; | |
669 | } | |
670 | static DRIVER_ATTR_WO(remove_id); | |
671 | ||
672 | static struct attribute *vmbus_drv_attrs[] = { | |
673 | &driver_attr_new_id.attr, | |
674 | &driver_attr_remove_id.attr, | |
675 | NULL, | |
676 | }; | |
677 | ATTRIBUTE_GROUPS(vmbus_drv); | |
3037a7b6 | 678 | |
b7fc147b S |
679 | |
680 | /* | |
681 | * vmbus_match - Attempt to match the specified device to the specified driver | |
682 | */ | |
683 | static int vmbus_match(struct device *device, struct device_driver *driver) | |
684 | { | |
b7fc147b | 685 | struct hv_driver *drv = drv_to_hv_drv(driver); |
e8e27047 | 686 | struct hv_device *hv_dev = device_to_hv_device(device); |
b7fc147b | 687 | |
8981da32 DC |
688 | /* The hv_sock driver handles all hv_sock offers. */ |
689 | if (is_hvsock_channel(hv_dev->channel)) | |
690 | return drv->hvsock; | |
691 | ||
fc76936d | 692 | if (hv_vmbus_get_id(drv, &hv_dev->dev_type)) |
3037a7b6 | 693 | return 1; |
de632a2b | 694 | |
5841a829 | 695 | return 0; |
b7fc147b S |
696 | } |
697 | ||
f1f0d67b S |
698 | /* |
699 | * vmbus_probe - Add the new vmbus's child device | |
700 | */ | |
701 | static int vmbus_probe(struct device *child_device) | |
702 | { | |
703 | int ret = 0; | |
704 | struct hv_driver *drv = | |
705 | drv_to_hv_drv(child_device->driver); | |
9efd21e1 | 706 | struct hv_device *dev = device_to_hv_device(child_device); |
84946899 | 707 | const struct hv_vmbus_device_id *dev_id; |
f1f0d67b | 708 | |
fc76936d | 709 | dev_id = hv_vmbus_get_id(drv, &dev->dev_type); |
9efd21e1 | 710 | if (drv->probe) { |
84946899 | 711 | ret = drv->probe(dev, dev_id); |
b14a7b30 | 712 | if (ret != 0) |
0a46618d HJ |
713 | pr_err("probe failed for device %s (%d)\n", |
714 | dev_name(child_device), ret); | |
f1f0d67b | 715 | |
f1f0d67b | 716 | } else { |
0a46618d HJ |
717 | pr_err("probe not set for driver %s\n", |
718 | dev_name(child_device)); | |
6de925b1 | 719 | ret = -ENODEV; |
f1f0d67b S |
720 | } |
721 | return ret; | |
722 | } | |
723 | ||
c5dce3db S |
724 | /* |
725 | * vmbus_remove - Remove a vmbus device | |
726 | */ | |
727 | static int vmbus_remove(struct device *child_device) | |
728 | { | |
d15a0301 | 729 | struct hv_driver *drv; |
415b023a | 730 | struct hv_device *dev = device_to_hv_device(child_device); |
c5dce3db | 731 | |
d15a0301 S |
732 | if (child_device->driver) { |
733 | drv = drv_to_hv_drv(child_device->driver); | |
734 | if (drv->remove) | |
735 | drv->remove(dev); | |
d15a0301 | 736 | } |
c5dce3db S |
737 | |
738 | return 0; | |
739 | } | |
740 | ||
eb1bb259 S |
741 | |
742 | /* | |
743 | * vmbus_shutdown - Shutdown a vmbus device | |
744 | */ | |
745 | static void vmbus_shutdown(struct device *child_device) | |
746 | { | |
747 | struct hv_driver *drv; | |
ca6887fb | 748 | struct hv_device *dev = device_to_hv_device(child_device); |
eb1bb259 S |
749 | |
750 | ||
751 | /* The device may not be attached yet */ | |
752 | if (!child_device->driver) | |
753 | return; | |
754 | ||
755 | drv = drv_to_hv_drv(child_device->driver); | |
756 | ||
ca6887fb S |
757 | if (drv->shutdown) |
758 | drv->shutdown(dev); | |
eb1bb259 S |
759 | } |
760 | ||
086e7a56 S |
761 | |
762 | /* | |
763 | * vmbus_device_release - Final callback release of the vmbus child device | |
764 | */ | |
765 | static void vmbus_device_release(struct device *device) | |
766 | { | |
e8e27047 | 767 | struct hv_device *hv_dev = device_to_hv_device(device); |
34c6801e | 768 | struct vmbus_channel *channel = hv_dev->channel; |
086e7a56 | 769 | |
54a66265 | 770 | mutex_lock(&vmbus_connection.channel_mutex); |
a92ebc9e | 771 | hv_process_channel_removal(channel->offermsg.child_relid); |
54a66265 | 772 | mutex_unlock(&vmbus_connection.channel_mutex); |
e8e27047 | 773 | kfree(hv_dev); |
086e7a56 S |
774 | |
775 | } | |
776 | ||
454f18a9 | 777 | /* The one and only one */ |
9adcac5c S |
778 | static struct bus_type hv_bus = { |
779 | .name = "vmbus", | |
780 | .match = vmbus_match, | |
781 | .shutdown = vmbus_shutdown, | |
782 | .remove = vmbus_remove, | |
783 | .probe = vmbus_probe, | |
784 | .uevent = vmbus_uevent, | |
fc76936d SH |
785 | .dev_groups = vmbus_dev_groups, |
786 | .drv_groups = vmbus_drv_groups, | |
3e7ee490 HJ |
787 | }; |
788 | ||
bf6506f6 TT |
789 | struct onmessage_work_context { |
790 | struct work_struct work; | |
791 | struct hv_message msg; | |
792 | }; | |
793 | ||
794 | static void vmbus_onmessage_work(struct work_struct *work) | |
795 | { | |
796 | struct onmessage_work_context *ctx; | |
797 | ||
09a19628 VK |
798 | /* Do not process messages if we're in DISCONNECTED state */ |
799 | if (vmbus_connection.conn_state == DISCONNECTED) | |
800 | return; | |
801 | ||
bf6506f6 TT |
802 | ctx = container_of(work, struct onmessage_work_context, |
803 | work); | |
804 | vmbus_onmessage(&ctx->msg); | |
805 | kfree(ctx); | |
806 | } | |
807 | ||
37cdd991 SH |
808 | static void hv_process_timer_expiration(struct hv_message *msg, |
809 | struct hv_per_cpu_context *hv_cpu) | |
4061ed9e | 810 | { |
37cdd991 | 811 | struct clock_event_device *dev = hv_cpu->clk_evt; |
4061ed9e S |
812 | |
813 | if (dev->event_handler) | |
814 | dev->event_handler(dev); | |
815 | ||
cd95aad5 | 816 | vmbus_signal_eom(msg, HVMSG_TIMER_EXPIRED); |
4061ed9e S |
817 | } |
818 | ||
d81274aa | 819 | void vmbus_on_msg_dpc(unsigned long data) |
36199a99 | 820 | { |
37cdd991 SH |
821 | struct hv_per_cpu_context *hv_cpu = (void *)data; |
822 | void *page_addr = hv_cpu->synic_message_page; | |
36199a99 GKH |
823 | struct hv_message *msg = (struct hv_message *)page_addr + |
824 | VMBUS_MESSAGE_SINT; | |
652594c7 | 825 | struct vmbus_channel_message_header *hdr; |
e6242fa0 | 826 | const struct vmbus_channel_message_table_entry *entry; |
bf6506f6 | 827 | struct onmessage_work_context *ctx; |
cd95aad5 | 828 | u32 message_type = msg->header.message_type; |
36199a99 | 829 | |
cd95aad5 | 830 | if (message_type == HVMSG_NONE) |
7be3e169 VK |
831 | /* no msg */ |
832 | return; | |
652594c7 | 833 | |
7be3e169 | 834 | hdr = (struct vmbus_channel_message_header *)msg->u.payload; |
652594c7 | 835 | |
7be3e169 VK |
836 | if (hdr->msgtype >= CHANNELMSG_COUNT) { |
837 | WARN_ONCE(1, "unknown msgtype=%d\n", hdr->msgtype); | |
838 | goto msg_handled; | |
839 | } | |
652594c7 | 840 | |
7be3e169 VK |
841 | entry = &channel_message_table[hdr->msgtype]; |
842 | if (entry->handler_type == VMHT_BLOCKING) { | |
843 | ctx = kmalloc(sizeof(*ctx), GFP_ATOMIC); | |
844 | if (ctx == NULL) | |
845 | return; | |
652594c7 | 846 | |
7be3e169 VK |
847 | INIT_WORK(&ctx->work, vmbus_onmessage_work); |
848 | memcpy(&ctx->msg, msg, sizeof(*msg)); | |
652594c7 | 849 | |
54a66265 S |
850 | /* |
851 | * The host can generate a rescind message while we | |
852 | * may still be handling the original offer. We deal with | |
853 | * this condition by ensuring the processing is done on the | |
854 | * same CPU. | |
855 | */ | |
856 | switch (hdr->msgtype) { | |
857 | case CHANNELMSG_RESCIND_CHANNELOFFER: | |
858 | /* | |
859 | * If we are handling the rescind message; | |
860 | * schedule the work on the global work queue. | |
861 | */ | |
862 | schedule_work_on(vmbus_connection.connect_cpu, | |
863 | &ctx->work); | |
864 | break; | |
865 | ||
866 | case CHANNELMSG_OFFERCHANNEL: | |
867 | atomic_inc(&vmbus_connection.offer_in_progress); | |
868 | queue_work_on(vmbus_connection.connect_cpu, | |
869 | vmbus_connection.work_queue, | |
870 | &ctx->work); | |
871 | break; | |
872 | ||
873 | default: | |
874 | queue_work(vmbus_connection.work_queue, &ctx->work); | |
875 | } | |
7be3e169 VK |
876 | } else |
877 | entry->message_handler(hdr); | |
36199a99 | 878 | |
652594c7 | 879 | msg_handled: |
cd95aad5 | 880 | vmbus_signal_eom(msg, message_type); |
36199a99 GKH |
881 | } |
882 | ||
631e63a9 | 883 | |
b71e3282 SH |
884 | /* |
885 | * Direct callback for channels using other deferred processing | |
886 | */ | |
887 | static void vmbus_channel_isr(struct vmbus_channel *channel) | |
888 | { | |
889 | void (*callback_fn)(void *); | |
890 | ||
891 | callback_fn = READ_ONCE(channel->onchannel_callback); | |
892 | if (likely(callback_fn != NULL)) | |
893 | (*callback_fn)(channel->channel_callback_context); | |
894 | } | |
895 | ||
631e63a9 SH |
896 | /* |
897 | * Schedule all channels with events pending | |
898 | */ | |
899 | static void vmbus_chan_sched(struct hv_per_cpu_context *hv_cpu) | |
900 | { | |
901 | unsigned long *recv_int_page; | |
902 | u32 maxbits, relid; | |
903 | ||
904 | if (vmbus_proto_version < VERSION_WIN8) { | |
905 | maxbits = MAX_NUM_CHANNELS_SUPPORTED; | |
906 | recv_int_page = vmbus_connection.recv_int_page; | |
907 | } else { | |
908 | /* | |
909 | * When the host is win8 and beyond, the event page | |
910 | * can be directly checked to get the id of the channel | |
911 | * that has the interrupt pending. | |
912 | */ | |
913 | void *page_addr = hv_cpu->synic_event_page; | |
914 | union hv_synic_event_flags *event | |
915 | = (union hv_synic_event_flags *)page_addr + | |
916 | VMBUS_MESSAGE_SINT; | |
917 | ||
918 | maxbits = HV_EVENT_FLAGS_COUNT; | |
919 | recv_int_page = event->flags; | |
920 | } | |
921 | ||
922 | if (unlikely(!recv_int_page)) | |
923 | return; | |
924 | ||
925 | for_each_set_bit(relid, recv_int_page, maxbits) { | |
926 | struct vmbus_channel *channel; | |
927 | ||
928 | if (!sync_test_and_clear_bit(relid, recv_int_page)) | |
929 | continue; | |
930 | ||
931 | /* Special case - vmbus channel protocol msg */ | |
932 | if (relid == 0) | |
933 | continue; | |
934 | ||
8200f208 SH |
935 | rcu_read_lock(); |
936 | ||
631e63a9 | 937 | /* Find channel based on relid */ |
8200f208 | 938 | list_for_each_entry_rcu(channel, &hv_cpu->chan_list, percpu_list) { |
b71e3282 SH |
939 | if (channel->offermsg.child_relid != relid) |
940 | continue; | |
941 | ||
2c469b1f S |
942 | if (channel->rescind) |
943 | continue; | |
944 | ||
b71e3282 SH |
945 | switch (channel->callback_mode) { |
946 | case HV_CALL_ISR: | |
947 | vmbus_channel_isr(channel); | |
631e63a9 | 948 | break; |
b71e3282 SH |
949 | |
950 | case HV_CALL_BATCHED: | |
951 | hv_begin_read(&channel->inbound); | |
952 | /* fallthrough */ | |
953 | case HV_CALL_DIRECT: | |
954 | tasklet_schedule(&channel->callback_event); | |
631e63a9 SH |
955 | } |
956 | } | |
8200f208 SH |
957 | |
958 | rcu_read_unlock(); | |
631e63a9 SH |
959 | } |
960 | } | |
961 | ||
76d388cd | 962 | static void vmbus_isr(void) |
36199a99 | 963 | { |
37cdd991 SH |
964 | struct hv_per_cpu_context *hv_cpu |
965 | = this_cpu_ptr(hv_context.cpu_context); | |
966 | void *page_addr = hv_cpu->synic_event_page; | |
36199a99 GKH |
967 | struct hv_message *msg; |
968 | union hv_synic_event_flags *event; | |
ae4636e6 | 969 | bool handled = false; |
36199a99 | 970 | |
37cdd991 | 971 | if (unlikely(page_addr == NULL)) |
76d388cd | 972 | return; |
5ab05951 S |
973 | |
974 | event = (union hv_synic_event_flags *)page_addr + | |
975 | VMBUS_MESSAGE_SINT; | |
7341d908 S |
976 | /* |
977 | * Check for events before checking for messages. This is the order | |
978 | * in which events and messages are checked in Windows guests on | |
979 | * Hyper-V, and the Windows team suggested we do the same. | |
980 | */ | |
36199a99 | 981 | |
6552ecd7 S |
982 | if ((vmbus_proto_version == VERSION_WS2008) || |
983 | (vmbus_proto_version == VERSION_WIN7)) { | |
36199a99 | 984 | |
6552ecd7 | 985 | /* Since we are a child, we only need to check bit 0 */ |
5c1bec61 | 986 | if (sync_test_and_clear_bit(0, event->flags)) |
6552ecd7 | 987 | handled = true; |
6552ecd7 S |
988 | } else { |
989 | /* | |
990 | * Our host is win8 or above. The signaling mechanism | |
991 | * has changed and we can directly look at the event page. | |
992 | * If bit n is set then we have an interrup on the channel | |
993 | * whose id is n. | |
994 | */ | |
ae4636e6 | 995 | handled = true; |
ae4636e6 | 996 | } |
793be9c7 | 997 | |
6552ecd7 | 998 | if (handled) |
631e63a9 | 999 | vmbus_chan_sched(hv_cpu); |
6552ecd7 | 1000 | |
37cdd991 | 1001 | page_addr = hv_cpu->synic_message_page; |
7341d908 S |
1002 | msg = (struct hv_message *)page_addr + VMBUS_MESSAGE_SINT; |
1003 | ||
1004 | /* Check if there are actual msgs to be processed */ | |
4061ed9e S |
1005 | if (msg->header.message_type != HVMSG_NONE) { |
1006 | if (msg->header.message_type == HVMSG_TIMER_EXPIRED) | |
37cdd991 | 1007 | hv_process_timer_expiration(msg, hv_cpu); |
4061ed9e | 1008 | else |
37cdd991 | 1009 | tasklet_schedule(&hv_cpu->msg_dpc); |
4061ed9e | 1010 | } |
4b44f2d1 SM |
1011 | |
1012 | add_interrupt_randomness(HYPERVISOR_CALLBACK_VECTOR, 0); | |
793be9c7 S |
1013 | } |
1014 | ||
e513229b | 1015 | |
3e189519 | 1016 | /* |
90c9960e GKH |
1017 | * vmbus_bus_init -Main vmbus driver initialization routine. |
1018 | * | |
1019 | * Here, we | |
0686e4f4 | 1020 | * - initialize the vmbus driver context |
0686e4f4 | 1021 | * - invoke the vmbus hv main init routine |
0686e4f4 | 1022 | * - retrieve the channel offers |
90c9960e | 1023 | */ |
efc26722 | 1024 | static int vmbus_bus_init(void) |
3e7ee490 | 1025 | { |
90c9960e | 1026 | int ret; |
3e7ee490 | 1027 | |
6d26e38f GKH |
1028 | /* Hypervisor initialization...setup hypercall page..etc */ |
1029 | ret = hv_init(); | |
90c9960e | 1030 | if (ret != 0) { |
0a46618d | 1031 | pr_err("Unable to initialize the hypervisor - 0x%x\n", ret); |
d6c1c5de | 1032 | return ret; |
3e7ee490 HJ |
1033 | } |
1034 | ||
9adcac5c | 1035 | ret = bus_register(&hv_bus); |
d6c1c5de | 1036 | if (ret) |
d6f3609d | 1037 | return ret; |
3e7ee490 | 1038 | |
76d388cd | 1039 | hv_setup_vmbus_irq(vmbus_isr); |
3e7ee490 | 1040 | |
2608fb65 JW |
1041 | ret = hv_synic_alloc(); |
1042 | if (ret) | |
1043 | goto err_alloc; | |
800b6902 | 1044 | /* |
302a3c0f | 1045 | * Initialize the per-cpu interrupt state and |
800b6902 S |
1046 | * connect to the host. |
1047 | */ | |
76d36ab7 VK |
1048 | ret = cpuhp_setup_state(CPUHP_AP_ONLINE_DYN, "x86/hyperv:online", |
1049 | hv_synic_init, hv_synic_cleanup); | |
1050 | if (ret < 0) | |
1051 | goto err_alloc; | |
1052 | hyperv_cpuhp_online = ret; | |
1053 | ||
800b6902 | 1054 | ret = vmbus_connect(); |
8b9987e9 | 1055 | if (ret) |
17efbee8 | 1056 | goto err_connect; |
800b6902 | 1057 | |
96c1d058 NM |
1058 | /* |
1059 | * Only register if the crash MSRs are available | |
1060 | */ | |
cc2dd402 | 1061 | if (ms_hyperv.misc_features & HV_FEATURE_GUEST_CRASH_MSR_AVAILABLE) { |
510f7aef | 1062 | register_die_notifier(&hyperv_die_block); |
96c1d058 NM |
1063 | atomic_notifier_chain_register(&panic_notifier_list, |
1064 | &hyperv_panic_block); | |
1065 | } | |
1066 | ||
2d6e882b | 1067 | vmbus_request_offers(); |
8b5d6d3b | 1068 | |
d6c1c5de | 1069 | return 0; |
8b9987e9 | 1070 | |
17efbee8 | 1071 | err_connect: |
76d36ab7 | 1072 | cpuhp_remove_state(hyperv_cpuhp_online); |
2608fb65 JW |
1073 | err_alloc: |
1074 | hv_synic_free(); | |
76d388cd | 1075 | hv_remove_vmbus_irq(); |
8b9987e9 | 1076 | |
8b9987e9 S |
1077 | bus_unregister(&hv_bus); |
1078 | ||
8b9987e9 | 1079 | return ret; |
3e7ee490 HJ |
1080 | } |
1081 | ||
90c9960e | 1082 | /** |
35464483 JO |
1083 | * __vmbus_child_driver_register() - Register a vmbus's driver |
1084 | * @hv_driver: Pointer to driver structure you want to register | |
768fa219 GKH |
1085 | * @owner: owner module of the drv |
1086 | * @mod_name: module name string | |
3e189519 HJ |
1087 | * |
1088 | * Registers the given driver with Linux through the 'driver_register()' call | |
768fa219 | 1089 | * and sets up the hyper-v vmbus handling for this driver. |
3e189519 HJ |
1090 | * It will return the state of the 'driver_register()' call. |
1091 | * | |
90c9960e | 1092 | */ |
768fa219 | 1093 | int __vmbus_driver_register(struct hv_driver *hv_driver, struct module *owner, const char *mod_name) |
3e7ee490 | 1094 | { |
5d48a1c2 | 1095 | int ret; |
3e7ee490 | 1096 | |
768fa219 | 1097 | pr_info("registering driver %s\n", hv_driver->name); |
3e7ee490 | 1098 | |
cf6a2eac S |
1099 | ret = vmbus_exists(); |
1100 | if (ret < 0) | |
1101 | return ret; | |
1102 | ||
768fa219 GKH |
1103 | hv_driver->driver.name = hv_driver->name; |
1104 | hv_driver->driver.owner = owner; | |
1105 | hv_driver->driver.mod_name = mod_name; | |
1106 | hv_driver->driver.bus = &hv_bus; | |
3e7ee490 | 1107 | |
fc76936d SH |
1108 | spin_lock_init(&hv_driver->dynids.lock); |
1109 | INIT_LIST_HEAD(&hv_driver->dynids.list); | |
1110 | ||
768fa219 | 1111 | ret = driver_register(&hv_driver->driver); |
3e7ee490 | 1112 | |
5d48a1c2 | 1113 | return ret; |
3e7ee490 | 1114 | } |
768fa219 | 1115 | EXPORT_SYMBOL_GPL(__vmbus_driver_register); |
3e7ee490 | 1116 | |
90c9960e | 1117 | /** |
768fa219 | 1118 | * vmbus_driver_unregister() - Unregister a vmbus's driver |
35464483 JO |
1119 | * @hv_driver: Pointer to driver structure you want to |
1120 | * un-register | |
3e189519 | 1121 | * |
768fa219 GKH |
1122 | * Un-register the given driver that was previous registered with a call to |
1123 | * vmbus_driver_register() | |
90c9960e | 1124 | */ |
768fa219 | 1125 | void vmbus_driver_unregister(struct hv_driver *hv_driver) |
3e7ee490 | 1126 | { |
768fa219 | 1127 | pr_info("unregistering driver %s\n", hv_driver->name); |
3e7ee490 | 1128 | |
fc76936d | 1129 | if (!vmbus_exists()) { |
8f257a14 | 1130 | driver_unregister(&hv_driver->driver); |
fc76936d SH |
1131 | vmbus_free_dynids(hv_driver); |
1132 | } | |
3e7ee490 | 1133 | } |
768fa219 | 1134 | EXPORT_SYMBOL_GPL(vmbus_driver_unregister); |
3e7ee490 | 1135 | |
3e189519 | 1136 | /* |
f2c73011 | 1137 | * vmbus_device_create - Creates and registers a new child device |
3e189519 | 1138 | * on the vmbus. |
90c9960e | 1139 | */ |
1b9d48f2 | 1140 | struct hv_device *vmbus_device_create(const uuid_le *type, |
1141 | const uuid_le *instance, | |
1142 | struct vmbus_channel *channel) | |
3e7ee490 | 1143 | { |
3d3b5518 | 1144 | struct hv_device *child_device_obj; |
3e7ee490 | 1145 | |
6bad88da S |
1146 | child_device_obj = kzalloc(sizeof(struct hv_device), GFP_KERNEL); |
1147 | if (!child_device_obj) { | |
0a46618d | 1148 | pr_err("Unable to allocate device object for child device\n"); |
3e7ee490 HJ |
1149 | return NULL; |
1150 | } | |
1151 | ||
cae5b843 | 1152 | child_device_obj->channel = channel; |
358d2ee2 | 1153 | memcpy(&child_device_obj->dev_type, type, sizeof(uuid_le)); |
ca623ad3 | 1154 | memcpy(&child_device_obj->dev_instance, instance, |
358d2ee2 | 1155 | sizeof(uuid_le)); |
7047f17d | 1156 | child_device_obj->vendor_id = 0x1414; /* MSFT vendor ID */ |
3e7ee490 | 1157 | |
3e7ee490 | 1158 | |
3e7ee490 HJ |
1159 | return child_device_obj; |
1160 | } | |
1161 | ||
3e189519 | 1162 | /* |
22794281 | 1163 | * vmbus_device_register - Register the child device |
90c9960e | 1164 | */ |
22794281 | 1165 | int vmbus_device_register(struct hv_device *child_device_obj) |
3e7ee490 | 1166 | { |
90c9960e | 1167 | int ret = 0; |
6bad88da | 1168 | |
f6b2db08 | 1169 | dev_set_name(&child_device_obj->device, "%pUl", |
b294809d | 1170 | child_device_obj->channel->offermsg.offer.if_instance.b); |
3e7ee490 | 1171 | |
0bce28b6 | 1172 | child_device_obj->device.bus = &hv_bus; |
607c1a11 | 1173 | child_device_obj->device.parent = &hv_acpi_dev->dev; |
6bad88da | 1174 | child_device_obj->device.release = vmbus_device_release; |
3e7ee490 | 1175 | |
90c9960e GKH |
1176 | /* |
1177 | * Register with the LDM. This will kick off the driver/device | |
1178 | * binding...which will eventually call vmbus_match() and vmbus_probe() | |
1179 | */ | |
6bad88da | 1180 | ret = device_register(&child_device_obj->device); |
3e7ee490 | 1181 | |
3e7ee490 | 1182 | if (ret) |
0a46618d | 1183 | pr_err("Unable to register child device\n"); |
3e7ee490 | 1184 | else |
84672369 | 1185 | pr_debug("child device %s registered\n", |
0a46618d | 1186 | dev_name(&child_device_obj->device)); |
3e7ee490 | 1187 | |
3e7ee490 HJ |
1188 | return ret; |
1189 | } | |
1190 | ||
3e189519 | 1191 | /* |
696453ba | 1192 | * vmbus_device_unregister - Remove the specified child device |
3e189519 | 1193 | * from the vmbus. |
90c9960e | 1194 | */ |
696453ba | 1195 | void vmbus_device_unregister(struct hv_device *device_obj) |
3e7ee490 | 1196 | { |
84672369 FS |
1197 | pr_debug("child device %s unregistered\n", |
1198 | dev_name(&device_obj->device)); | |
1199 | ||
90c9960e GKH |
1200 | /* |
1201 | * Kick off the process of unregistering the device. | |
1202 | * This will call vmbus_remove() and eventually vmbus_device_release() | |
1203 | */ | |
6bad88da | 1204 | device_unregister(&device_obj->device); |
3e7ee490 HJ |
1205 | } |
1206 | ||
3e7ee490 | 1207 | |
b0069f43 | 1208 | /* |
7f163a6f | 1209 | * VMBUS is an acpi enumerated device. Get the information we |
90f34535 | 1210 | * need from DSDT. |
b0069f43 | 1211 | */ |
7f163a6f | 1212 | #define VTPM_BASE_ADDRESS 0xfed40000 |
90f34535 | 1213 | static acpi_status vmbus_walk_resources(struct acpi_resource *res, void *ctx) |
b0069f43 | 1214 | { |
7f163a6f JO |
1215 | resource_size_t start = 0; |
1216 | resource_size_t end = 0; | |
1217 | struct resource *new_res; | |
1218 | struct resource **old_res = &hyperv_mmio; | |
1219 | struct resource **prev_res = NULL; | |
1220 | ||
90f34535 | 1221 | switch (res->type) { |
7f163a6f JO |
1222 | |
1223 | /* | |
1224 | * "Address" descriptors are for bus windows. Ignore | |
1225 | * "memory" descriptors, which are for registers on | |
1226 | * devices. | |
1227 | */ | |
1228 | case ACPI_RESOURCE_TYPE_ADDRESS32: | |
1229 | start = res->data.address32.address.minimum; | |
1230 | end = res->data.address32.address.maximum; | |
4eb923f8 | 1231 | break; |
b0069f43 | 1232 | |
90f34535 | 1233 | case ACPI_RESOURCE_TYPE_ADDRESS64: |
7f163a6f JO |
1234 | start = res->data.address64.address.minimum; |
1235 | end = res->data.address64.address.maximum; | |
4eb923f8 | 1236 | break; |
7f163a6f JO |
1237 | |
1238 | default: | |
1239 | /* Unused resource type */ | |
1240 | return AE_OK; | |
1241 | ||
b0069f43 | 1242 | } |
7f163a6f JO |
1243 | /* |
1244 | * Ignore ranges that are below 1MB, as they're not | |
1245 | * necessary or useful here. | |
1246 | */ | |
1247 | if (end < 0x100000) | |
1248 | return AE_OK; | |
1249 | ||
1250 | new_res = kzalloc(sizeof(*new_res), GFP_ATOMIC); | |
1251 | if (!new_res) | |
1252 | return AE_NO_MEMORY; | |
1253 | ||
1254 | /* If this range overlaps the virtual TPM, truncate it. */ | |
1255 | if (end > VTPM_BASE_ADDRESS && start < VTPM_BASE_ADDRESS) | |
1256 | end = VTPM_BASE_ADDRESS; | |
1257 | ||
1258 | new_res->name = "hyperv mmio"; | |
1259 | new_res->flags = IORESOURCE_MEM; | |
1260 | new_res->start = start; | |
1261 | new_res->end = end; | |
1262 | ||
40f26f31 | 1263 | /* |
40f26f31 JO |
1264 | * If two ranges are adjacent, merge them. |
1265 | */ | |
7f163a6f JO |
1266 | do { |
1267 | if (!*old_res) { | |
1268 | *old_res = new_res; | |
1269 | break; | |
1270 | } | |
1271 | ||
40f26f31 JO |
1272 | if (((*old_res)->end + 1) == new_res->start) { |
1273 | (*old_res)->end = new_res->end; | |
1274 | kfree(new_res); | |
1275 | break; | |
1276 | } | |
1277 | ||
1278 | if ((*old_res)->start == new_res->end + 1) { | |
1279 | (*old_res)->start = new_res->start; | |
1280 | kfree(new_res); | |
1281 | break; | |
1282 | } | |
1283 | ||
23a06831 | 1284 | if ((*old_res)->start > new_res->end) { |
7f163a6f JO |
1285 | new_res->sibling = *old_res; |
1286 | if (prev_res) | |
1287 | (*prev_res)->sibling = new_res; | |
1288 | *old_res = new_res; | |
1289 | break; | |
1290 | } | |
1291 | ||
1292 | prev_res = old_res; | |
1293 | old_res = &(*old_res)->sibling; | |
1294 | ||
1295 | } while (1); | |
b0069f43 S |
1296 | |
1297 | return AE_OK; | |
1298 | } | |
1299 | ||
7f163a6f JO |
1300 | static int vmbus_acpi_remove(struct acpi_device *device) |
1301 | { | |
1302 | struct resource *cur_res; | |
1303 | struct resource *next_res; | |
1304 | ||
1305 | if (hyperv_mmio) { | |
6d146aef JO |
1306 | if (fb_mmio) { |
1307 | __release_region(hyperv_mmio, fb_mmio->start, | |
1308 | resource_size(fb_mmio)); | |
1309 | fb_mmio = NULL; | |
1310 | } | |
1311 | ||
7f163a6f JO |
1312 | for (cur_res = hyperv_mmio; cur_res; cur_res = next_res) { |
1313 | next_res = cur_res->sibling; | |
1314 | kfree(cur_res); | |
1315 | } | |
1316 | } | |
1317 | ||
1318 | return 0; | |
1319 | } | |
1320 | ||
6d146aef JO |
1321 | static void vmbus_reserve_fb(void) |
1322 | { | |
1323 | int size; | |
1324 | /* | |
1325 | * Make a claim for the frame buffer in the resource tree under the | |
1326 | * first node, which will be the one below 4GB. The length seems to | |
1327 | * be underreported, particularly in a Generation 1 VM. So start out | |
1328 | * reserving a larger area and make it smaller until it succeeds. | |
1329 | */ | |
1330 | ||
1331 | if (screen_info.lfb_base) { | |
1332 | if (efi_enabled(EFI_BOOT)) | |
1333 | size = max_t(__u32, screen_info.lfb_size, 0x800000); | |
1334 | else | |
1335 | size = max_t(__u32, screen_info.lfb_size, 0x4000000); | |
1336 | ||
1337 | for (; !fb_mmio && (size >= 0x100000); size >>= 1) { | |
1338 | fb_mmio = __request_region(hyperv_mmio, | |
1339 | screen_info.lfb_base, size, | |
1340 | fb_mmio_name, 0); | |
1341 | } | |
1342 | } | |
1343 | } | |
1344 | ||
35464483 JO |
1345 | /** |
1346 | * vmbus_allocate_mmio() - Pick a memory-mapped I/O range. | |
1347 | * @new: If successful, supplied a pointer to the | |
1348 | * allocated MMIO space. | |
1349 | * @device_obj: Identifies the caller | |
1350 | * @min: Minimum guest physical address of the | |
1351 | * allocation | |
1352 | * @max: Maximum guest physical address | |
1353 | * @size: Size of the range to be allocated | |
1354 | * @align: Alignment of the range to be allocated | |
1355 | * @fb_overlap_ok: Whether this allocation can be allowed | |
1356 | * to overlap the video frame buffer. | |
1357 | * | |
1358 | * This function walks the resources granted to VMBus by the | |
1359 | * _CRS object in the ACPI namespace underneath the parent | |
1360 | * "bridge" whether that's a root PCI bus in the Generation 1 | |
1361 | * case or a Module Device in the Generation 2 case. It then | |
1362 | * attempts to allocate from the global MMIO pool in a way that | |
1363 | * matches the constraints supplied in these parameters and by | |
1364 | * that _CRS. | |
1365 | * | |
1366 | * Return: 0 on success, -errno on failure | |
1367 | */ | |
1368 | int vmbus_allocate_mmio(struct resource **new, struct hv_device *device_obj, | |
1369 | resource_size_t min, resource_size_t max, | |
1370 | resource_size_t size, resource_size_t align, | |
1371 | bool fb_overlap_ok) | |
1372 | { | |
be000f93 | 1373 | struct resource *iter, *shadow; |
ea37a6b8 | 1374 | resource_size_t range_min, range_max, start; |
35464483 | 1375 | const char *dev_n = dev_name(&device_obj->device); |
ea37a6b8 | 1376 | int retval; |
e16dad6b JO |
1377 | |
1378 | retval = -ENXIO; | |
1379 | down(&hyperv_mmio_lock); | |
35464483 | 1380 | |
ea37a6b8 JO |
1381 | /* |
1382 | * If overlaps with frame buffers are allowed, then first attempt to | |
1383 | * make the allocation from within the reserved region. Because it | |
1384 | * is already reserved, no shadow allocation is necessary. | |
1385 | */ | |
1386 | if (fb_overlap_ok && fb_mmio && !(min > fb_mmio->end) && | |
1387 | !(max < fb_mmio->start)) { | |
1388 | ||
1389 | range_min = fb_mmio->start; | |
1390 | range_max = fb_mmio->end; | |
1391 | start = (range_min + align - 1) & ~(align - 1); | |
1392 | for (; start + size - 1 <= range_max; start += align) { | |
1393 | *new = request_mem_region_exclusive(start, size, dev_n); | |
1394 | if (*new) { | |
1395 | retval = 0; | |
1396 | goto exit; | |
1397 | } | |
1398 | } | |
1399 | } | |
1400 | ||
35464483 JO |
1401 | for (iter = hyperv_mmio; iter; iter = iter->sibling) { |
1402 | if ((iter->start >= max) || (iter->end <= min)) | |
1403 | continue; | |
1404 | ||
1405 | range_min = iter->start; | |
1406 | range_max = iter->end; | |
ea37a6b8 JO |
1407 | start = (range_min + align - 1) & ~(align - 1); |
1408 | for (; start + size - 1 <= range_max; start += align) { | |
1409 | shadow = __request_region(iter, start, size, NULL, | |
1410 | IORESOURCE_BUSY); | |
1411 | if (!shadow) | |
1412 | continue; | |
1413 | ||
1414 | *new = request_mem_region_exclusive(start, size, dev_n); | |
1415 | if (*new) { | |
1416 | shadow->name = (char *)*new; | |
1417 | retval = 0; | |
1418 | goto exit; | |
35464483 JO |
1419 | } |
1420 | ||
ea37a6b8 | 1421 | __release_region(iter, start, size); |
35464483 JO |
1422 | } |
1423 | } | |
1424 | ||
e16dad6b JO |
1425 | exit: |
1426 | up(&hyperv_mmio_lock); | |
1427 | return retval; | |
35464483 JO |
1428 | } |
1429 | EXPORT_SYMBOL_GPL(vmbus_allocate_mmio); | |
1430 | ||
97fb77dc JO |
1431 | /** |
1432 | * vmbus_free_mmio() - Free a memory-mapped I/O range. | |
1433 | * @start: Base address of region to release. | |
1434 | * @size: Size of the range to be allocated | |
1435 | * | |
1436 | * This function releases anything requested by | |
1437 | * vmbus_mmio_allocate(). | |
1438 | */ | |
1439 | void vmbus_free_mmio(resource_size_t start, resource_size_t size) | |
1440 | { | |
be000f93 JO |
1441 | struct resource *iter; |
1442 | ||
1443 | down(&hyperv_mmio_lock); | |
1444 | for (iter = hyperv_mmio; iter; iter = iter->sibling) { | |
1445 | if ((iter->start >= start + size) || (iter->end <= start)) | |
1446 | continue; | |
1447 | ||
1448 | __release_region(iter, start, size); | |
1449 | } | |
97fb77dc | 1450 | release_mem_region(start, size); |
be000f93 | 1451 | up(&hyperv_mmio_lock); |
97fb77dc JO |
1452 | |
1453 | } | |
1454 | EXPORT_SYMBOL_GPL(vmbus_free_mmio); | |
1455 | ||
619848bd JO |
1456 | /** |
1457 | * vmbus_cpu_number_to_vp_number() - Map CPU to VP. | |
1458 | * @cpu_number: CPU number in Linux terms | |
1459 | * | |
1460 | * This function returns the mapping between the Linux processor | |
1461 | * number and the hypervisor's virtual processor number, useful | |
1462 | * in making hypercalls and such that talk about specific | |
1463 | * processors. | |
1464 | * | |
1465 | * Return: Virtual processor number in Hyper-V terms | |
1466 | */ | |
1467 | int vmbus_cpu_number_to_vp_number(int cpu_number) | |
1468 | { | |
1469 | return hv_context.vp_index[cpu_number]; | |
1470 | } | |
1471 | EXPORT_SYMBOL_GPL(vmbus_cpu_number_to_vp_number); | |
1472 | ||
b0069f43 S |
1473 | static int vmbus_acpi_add(struct acpi_device *device) |
1474 | { | |
1475 | acpi_status result; | |
90f34535 | 1476 | int ret_val = -ENODEV; |
7f163a6f | 1477 | struct acpi_device *ancestor; |
b0069f43 | 1478 | |
607c1a11 S |
1479 | hv_acpi_dev = device; |
1480 | ||
0a4425b6 | 1481 | result = acpi_walk_resources(device->handle, METHOD_NAME__CRS, |
90f34535 | 1482 | vmbus_walk_resources, NULL); |
b0069f43 | 1483 | |
90f34535 S |
1484 | if (ACPI_FAILURE(result)) |
1485 | goto acpi_walk_err; | |
1486 | /* | |
7f163a6f JO |
1487 | * Some ancestor of the vmbus acpi device (Gen1 or Gen2 |
1488 | * firmware) is the VMOD that has the mmio ranges. Get that. | |
90f34535 | 1489 | */ |
7f163a6f JO |
1490 | for (ancestor = device->parent; ancestor; ancestor = ancestor->parent) { |
1491 | result = acpi_walk_resources(ancestor->handle, METHOD_NAME__CRS, | |
1492 | vmbus_walk_resources, NULL); | |
90f34535 S |
1493 | |
1494 | if (ACPI_FAILURE(result)) | |
7f163a6f | 1495 | continue; |
6d146aef JO |
1496 | if (hyperv_mmio) { |
1497 | vmbus_reserve_fb(); | |
7f163a6f | 1498 | break; |
6d146aef | 1499 | } |
b0069f43 | 1500 | } |
90f34535 S |
1501 | ret_val = 0; |
1502 | ||
1503 | acpi_walk_err: | |
b0069f43 | 1504 | complete(&probe_event); |
7f163a6f JO |
1505 | if (ret_val) |
1506 | vmbus_acpi_remove(device); | |
90f34535 | 1507 | return ret_val; |
b0069f43 S |
1508 | } |
1509 | ||
1510 | static const struct acpi_device_id vmbus_acpi_device_ids[] = { | |
1511 | {"VMBUS", 0}, | |
9d7b18d1 | 1512 | {"VMBus", 0}, |
b0069f43 S |
1513 | {"", 0}, |
1514 | }; | |
1515 | MODULE_DEVICE_TABLE(acpi, vmbus_acpi_device_ids); | |
1516 | ||
1517 | static struct acpi_driver vmbus_acpi_driver = { | |
1518 | .name = "vmbus", | |
1519 | .ids = vmbus_acpi_device_ids, | |
1520 | .ops = { | |
1521 | .add = vmbus_acpi_add, | |
e4ecb41c | 1522 | .remove = vmbus_acpi_remove, |
b0069f43 S |
1523 | }, |
1524 | }; | |
1525 | ||
2517281d VK |
1526 | static void hv_kexec_handler(void) |
1527 | { | |
2517281d | 1528 | hv_synic_clockevents_cleanup(); |
75ff3a8a | 1529 | vmbus_initiate_unload(false); |
523b9408 VK |
1530 | vmbus_connection.conn_state = DISCONNECTED; |
1531 | /* Make sure conn_state is set as hv_synic_cleanup checks for it */ | |
1532 | mb(); | |
76d36ab7 | 1533 | cpuhp_remove_state(hyperv_cpuhp_online); |
d6f3609d | 1534 | hyperv_cleanup(); |
2517281d VK |
1535 | }; |
1536 | ||
b4370df2 VK |
1537 | static void hv_crash_handler(struct pt_regs *regs) |
1538 | { | |
75ff3a8a | 1539 | vmbus_initiate_unload(true); |
b4370df2 VK |
1540 | /* |
1541 | * In crash handler we can't schedule synic cleanup for all CPUs, | |
1542 | * doing the cleanup for current CPU only. This should be sufficient | |
1543 | * for kdump. | |
1544 | */ | |
523b9408 | 1545 | vmbus_connection.conn_state = DISCONNECTED; |
76d36ab7 | 1546 | hv_synic_cleanup(smp_processor_id()); |
d6f3609d | 1547 | hyperv_cleanup(); |
b4370df2 VK |
1548 | }; |
1549 | ||
607c1a11 | 1550 | static int __init hv_acpi_init(void) |
1168ac22 | 1551 | { |
2dda95f8 | 1552 | int ret, t; |
b0069f43 | 1553 | |
c24b0a22 | 1554 | if (x86_hyper_type != X86_HYPER_MS_HYPERV) |
0592969e JW |
1555 | return -ENODEV; |
1556 | ||
b0069f43 S |
1557 | init_completion(&probe_event); |
1558 | ||
1559 | /* | |
efc26722 | 1560 | * Get ACPI resources first. |
b0069f43 | 1561 | */ |
0246604c S |
1562 | ret = acpi_bus_register_driver(&vmbus_acpi_driver); |
1563 | ||
b0069f43 S |
1564 | if (ret) |
1565 | return ret; | |
1566 | ||
2dda95f8 S |
1567 | t = wait_for_completion_timeout(&probe_event, 5*HZ); |
1568 | if (t == 0) { | |
1569 | ret = -ETIMEDOUT; | |
1570 | goto cleanup; | |
1571 | } | |
b0069f43 | 1572 | |
efc26722 | 1573 | ret = vmbus_bus_init(); |
91fd799e | 1574 | if (ret) |
2dda95f8 S |
1575 | goto cleanup; |
1576 | ||
2517281d | 1577 | hv_setup_kexec_handler(hv_kexec_handler); |
b4370df2 | 1578 | hv_setup_crash_handler(hv_crash_handler); |
2517281d | 1579 | |
2dda95f8 S |
1580 | return 0; |
1581 | ||
1582 | cleanup: | |
1583 | acpi_bus_unregister_driver(&vmbus_acpi_driver); | |
cf6a2eac | 1584 | hv_acpi_dev = NULL; |
91fd799e | 1585 | return ret; |
1168ac22 S |
1586 | } |
1587 | ||
93e5bd06 S |
1588 | static void __exit vmbus_exit(void) |
1589 | { | |
e72e7ac5 VK |
1590 | int cpu; |
1591 | ||
2517281d | 1592 | hv_remove_kexec_handler(); |
b4370df2 | 1593 | hv_remove_crash_handler(); |
09a19628 | 1594 | vmbus_connection.conn_state = DISCONNECTED; |
e086748c | 1595 | hv_synic_clockevents_cleanup(); |
2db84eff | 1596 | vmbus_disconnect(); |
76d388cd | 1597 | hv_remove_vmbus_irq(); |
37cdd991 SH |
1598 | for_each_online_cpu(cpu) { |
1599 | struct hv_per_cpu_context *hv_cpu | |
1600 | = per_cpu_ptr(hv_context.cpu_context, cpu); | |
1601 | ||
1602 | tasklet_kill(&hv_cpu->msg_dpc); | |
1603 | } | |
93e5bd06 | 1604 | vmbus_free_channels(); |
37cdd991 | 1605 | |
cc2dd402 | 1606 | if (ms_hyperv.misc_features & HV_FEATURE_GUEST_CRASH_MSR_AVAILABLE) { |
510f7aef | 1607 | unregister_die_notifier(&hyperv_die_block); |
096c605f VK |
1608 | atomic_notifier_chain_unregister(&panic_notifier_list, |
1609 | &hyperv_panic_block); | |
1610 | } | |
93e5bd06 | 1611 | bus_unregister(&hv_bus); |
37cdd991 | 1612 | |
76d36ab7 | 1613 | cpuhp_remove_state(hyperv_cpuhp_online); |
06210b42 | 1614 | hv_synic_free(); |
93e5bd06 S |
1615 | acpi_bus_unregister_driver(&vmbus_acpi_driver); |
1616 | } | |
1617 | ||
1168ac22 | 1618 | |
90c9960e | 1619 | MODULE_LICENSE("GPL"); |
3e7ee490 | 1620 | |
43d4e119 | 1621 | subsys_initcall(hv_acpi_init); |
93e5bd06 | 1622 | module_exit(vmbus_exit); |