2 * Copyright (c) 2009, Microsoft Corporation.
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.
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
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.
18 * Haiyang Zhang <haiyangz@microsoft.com>
19 * Hank Janssen <hjanssen@microsoft.com>
20 * K. Y. Srinivasan <kys@microsoft.com>
23 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
25 #include <linux/init.h>
26 #include <linux/module.h>
27 #include <linux/device.h>
28 #include <linux/interrupt.h>
29 #include <linux/sysctl.h>
30 #include <linux/slab.h>
31 #include <linux/acpi.h>
32 #include <linux/completion.h>
33 #include <linux/hyperv.h>
34 #include <linux/kernel_stat.h>
35 #include <linux/clockchips.h>
36 #include <linux/cpu.h>
37 #include <linux/sched/task_stack.h>
39 #include <asm/hyperv.h>
40 #include <asm/hypervisor.h>
41 #include <asm/mshyperv.h>
42 #include <linux/notifier.h>
43 #include <linux/ptrace.h>
44 #include <linux/screen_info.h>
45 #include <linux/kdebug.h>
46 #include <linux/efi.h>
47 #include <linux/random.h>
48 #include "hyperv_vmbus.h"
51 struct list_head node;
52 struct hv_vmbus_device_id id;
55 static struct acpi_device *hv_acpi_dev;
57 static struct completion probe_event;
59 static int hyperv_cpuhp_online;
61 static int hyperv_panic_event(struct notifier_block *nb, unsigned long val,
66 regs = current_pt_regs();
68 hyperv_report_panic(regs, val);
72 static int hyperv_die_event(struct notifier_block *nb, unsigned long val,
75 struct die_args *die = (struct die_args *)args;
76 struct pt_regs *regs = die->regs;
78 hyperv_report_panic(regs, val);
82 static struct notifier_block hyperv_die_block = {
83 .notifier_call = hyperv_die_event,
85 static struct notifier_block hyperv_panic_block = {
86 .notifier_call = hyperv_panic_event,
89 static const char *fb_mmio_name = "fb_range";
90 static struct resource *fb_mmio;
91 static struct resource *hyperv_mmio;
92 static DEFINE_SEMAPHORE(hyperv_mmio_lock);
94 static int vmbus_exists(void)
96 if (hv_acpi_dev == NULL)
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)
106 for (i = 0; i < VMBUS_ALIAS_LEN; i += 2)
107 sprintf(&alias_name[i], "%02x", hv_dev->dev_type.b[i/2]);
110 static u8 channel_monitor_group(const struct vmbus_channel *channel)
112 return (u8)channel->offermsg.monitorid / 32;
115 static u8 channel_monitor_offset(const struct vmbus_channel *channel)
117 return (u8)channel->offermsg.monitorid % 32;
120 static u32 channel_pending(const struct vmbus_channel *channel,
121 const struct hv_monitor_page *monitor_page)
123 u8 monitor_group = channel_monitor_group(channel);
125 return monitor_page->trigger_group[monitor_group].pending;
128 static u32 channel_latency(const struct vmbus_channel *channel,
129 const struct hv_monitor_page *monitor_page)
131 u8 monitor_group = channel_monitor_group(channel);
132 u8 monitor_offset = channel_monitor_offset(channel);
134 return monitor_page->latency[monitor_group][monitor_offset];
137 static u32 channel_conn_id(struct vmbus_channel *channel,
138 struct hv_monitor_page *monitor_page)
140 u8 monitor_group = channel_monitor_group(channel);
141 u8 monitor_offset = channel_monitor_offset(channel);
142 return monitor_page->parameter[monitor_group][monitor_offset].connectionid.u.id;
145 static ssize_t id_show(struct device *dev, struct device_attribute *dev_attr,
148 struct hv_device *hv_dev = device_to_hv_device(dev);
150 if (!hv_dev->channel)
152 return sprintf(buf, "%d\n", hv_dev->channel->offermsg.child_relid);
154 static DEVICE_ATTR_RO(id);
156 static ssize_t state_show(struct device *dev, struct device_attribute *dev_attr,
159 struct hv_device *hv_dev = device_to_hv_device(dev);
161 if (!hv_dev->channel)
163 return sprintf(buf, "%d\n", hv_dev->channel->state);
165 static DEVICE_ATTR_RO(state);
167 static ssize_t monitor_id_show(struct device *dev,
168 struct device_attribute *dev_attr, char *buf)
170 struct hv_device *hv_dev = device_to_hv_device(dev);
172 if (!hv_dev->channel)
174 return sprintf(buf, "%d\n", hv_dev->channel->offermsg.monitorid);
176 static DEVICE_ATTR_RO(monitor_id);
178 static ssize_t class_id_show(struct device *dev,
179 struct device_attribute *dev_attr, char *buf)
181 struct hv_device *hv_dev = device_to_hv_device(dev);
183 if (!hv_dev->channel)
185 return sprintf(buf, "{%pUl}\n",
186 hv_dev->channel->offermsg.offer.if_type.b);
188 static DEVICE_ATTR_RO(class_id);
190 static ssize_t device_id_show(struct device *dev,
191 struct device_attribute *dev_attr, char *buf)
193 struct hv_device *hv_dev = device_to_hv_device(dev);
195 if (!hv_dev->channel)
197 return sprintf(buf, "{%pUl}\n",
198 hv_dev->channel->offermsg.offer.if_instance.b);
200 static DEVICE_ATTR_RO(device_id);
202 static ssize_t modalias_show(struct device *dev,
203 struct device_attribute *dev_attr, char *buf)
205 struct hv_device *hv_dev = device_to_hv_device(dev);
206 char alias_name[VMBUS_ALIAS_LEN + 1];
208 print_alias_name(hv_dev, alias_name);
209 return sprintf(buf, "vmbus:%s\n", alias_name);
211 static DEVICE_ATTR_RO(modalias);
213 static ssize_t server_monitor_pending_show(struct device *dev,
214 struct device_attribute *dev_attr,
217 struct hv_device *hv_dev = device_to_hv_device(dev);
219 if (!hv_dev->channel)
221 return sprintf(buf, "%d\n",
222 channel_pending(hv_dev->channel,
223 vmbus_connection.monitor_pages[1]));
225 static DEVICE_ATTR_RO(server_monitor_pending);
227 static ssize_t client_monitor_pending_show(struct device *dev,
228 struct device_attribute *dev_attr,
231 struct hv_device *hv_dev = device_to_hv_device(dev);
233 if (!hv_dev->channel)
235 return sprintf(buf, "%d\n",
236 channel_pending(hv_dev->channel,
237 vmbus_connection.monitor_pages[1]));
239 static DEVICE_ATTR_RO(client_monitor_pending);
241 static ssize_t server_monitor_latency_show(struct device *dev,
242 struct device_attribute *dev_attr,
245 struct hv_device *hv_dev = device_to_hv_device(dev);
247 if (!hv_dev->channel)
249 return sprintf(buf, "%d\n",
250 channel_latency(hv_dev->channel,
251 vmbus_connection.monitor_pages[0]));
253 static DEVICE_ATTR_RO(server_monitor_latency);
255 static ssize_t client_monitor_latency_show(struct device *dev,
256 struct device_attribute *dev_attr,
259 struct hv_device *hv_dev = device_to_hv_device(dev);
261 if (!hv_dev->channel)
263 return sprintf(buf, "%d\n",
264 channel_latency(hv_dev->channel,
265 vmbus_connection.monitor_pages[1]));
267 static DEVICE_ATTR_RO(client_monitor_latency);
269 static ssize_t server_monitor_conn_id_show(struct device *dev,
270 struct device_attribute *dev_attr,
273 struct hv_device *hv_dev = device_to_hv_device(dev);
275 if (!hv_dev->channel)
277 return sprintf(buf, "%d\n",
278 channel_conn_id(hv_dev->channel,
279 vmbus_connection.monitor_pages[0]));
281 static DEVICE_ATTR_RO(server_monitor_conn_id);
283 static ssize_t client_monitor_conn_id_show(struct device *dev,
284 struct device_attribute *dev_attr,
287 struct hv_device *hv_dev = device_to_hv_device(dev);
289 if (!hv_dev->channel)
291 return sprintf(buf, "%d\n",
292 channel_conn_id(hv_dev->channel,
293 vmbus_connection.monitor_pages[1]));
295 static DEVICE_ATTR_RO(client_monitor_conn_id);
297 static ssize_t out_intr_mask_show(struct device *dev,
298 struct device_attribute *dev_attr, char *buf)
300 struct hv_device *hv_dev = device_to_hv_device(dev);
301 struct hv_ring_buffer_debug_info outbound;
303 if (!hv_dev->channel)
305 hv_ringbuffer_get_debuginfo(&hv_dev->channel->outbound, &outbound);
306 return sprintf(buf, "%d\n", outbound.current_interrupt_mask);
308 static DEVICE_ATTR_RO(out_intr_mask);
310 static ssize_t out_read_index_show(struct device *dev,
311 struct device_attribute *dev_attr, char *buf)
313 struct hv_device *hv_dev = device_to_hv_device(dev);
314 struct hv_ring_buffer_debug_info outbound;
316 if (!hv_dev->channel)
318 hv_ringbuffer_get_debuginfo(&hv_dev->channel->outbound, &outbound);
319 return sprintf(buf, "%d\n", outbound.current_read_index);
321 static DEVICE_ATTR_RO(out_read_index);
323 static ssize_t out_write_index_show(struct device *dev,
324 struct device_attribute *dev_attr,
327 struct hv_device *hv_dev = device_to_hv_device(dev);
328 struct hv_ring_buffer_debug_info outbound;
330 if (!hv_dev->channel)
332 hv_ringbuffer_get_debuginfo(&hv_dev->channel->outbound, &outbound);
333 return sprintf(buf, "%d\n", outbound.current_write_index);
335 static DEVICE_ATTR_RO(out_write_index);
337 static ssize_t out_read_bytes_avail_show(struct device *dev,
338 struct device_attribute *dev_attr,
341 struct hv_device *hv_dev = device_to_hv_device(dev);
342 struct hv_ring_buffer_debug_info outbound;
344 if (!hv_dev->channel)
346 hv_ringbuffer_get_debuginfo(&hv_dev->channel->outbound, &outbound);
347 return sprintf(buf, "%d\n", outbound.bytes_avail_toread);
349 static DEVICE_ATTR_RO(out_read_bytes_avail);
351 static ssize_t out_write_bytes_avail_show(struct device *dev,
352 struct device_attribute *dev_attr,
355 struct hv_device *hv_dev = device_to_hv_device(dev);
356 struct hv_ring_buffer_debug_info outbound;
358 if (!hv_dev->channel)
360 hv_ringbuffer_get_debuginfo(&hv_dev->channel->outbound, &outbound);
361 return sprintf(buf, "%d\n", outbound.bytes_avail_towrite);
363 static DEVICE_ATTR_RO(out_write_bytes_avail);
365 static ssize_t in_intr_mask_show(struct device *dev,
366 struct device_attribute *dev_attr, char *buf)
368 struct hv_device *hv_dev = device_to_hv_device(dev);
369 struct hv_ring_buffer_debug_info inbound;
371 if (!hv_dev->channel)
373 hv_ringbuffer_get_debuginfo(&hv_dev->channel->inbound, &inbound);
374 return sprintf(buf, "%d\n", inbound.current_interrupt_mask);
376 static DEVICE_ATTR_RO(in_intr_mask);
378 static ssize_t in_read_index_show(struct device *dev,
379 struct device_attribute *dev_attr, char *buf)
381 struct hv_device *hv_dev = device_to_hv_device(dev);
382 struct hv_ring_buffer_debug_info inbound;
384 if (!hv_dev->channel)
386 hv_ringbuffer_get_debuginfo(&hv_dev->channel->inbound, &inbound);
387 return sprintf(buf, "%d\n", inbound.current_read_index);
389 static DEVICE_ATTR_RO(in_read_index);
391 static ssize_t in_write_index_show(struct device *dev,
392 struct device_attribute *dev_attr, char *buf)
394 struct hv_device *hv_dev = device_to_hv_device(dev);
395 struct hv_ring_buffer_debug_info inbound;
397 if (!hv_dev->channel)
399 hv_ringbuffer_get_debuginfo(&hv_dev->channel->inbound, &inbound);
400 return sprintf(buf, "%d\n", inbound.current_write_index);
402 static DEVICE_ATTR_RO(in_write_index);
404 static ssize_t in_read_bytes_avail_show(struct device *dev,
405 struct device_attribute *dev_attr,
408 struct hv_device *hv_dev = device_to_hv_device(dev);
409 struct hv_ring_buffer_debug_info inbound;
411 if (!hv_dev->channel)
413 hv_ringbuffer_get_debuginfo(&hv_dev->channel->inbound, &inbound);
414 return sprintf(buf, "%d\n", inbound.bytes_avail_toread);
416 static DEVICE_ATTR_RO(in_read_bytes_avail);
418 static ssize_t in_write_bytes_avail_show(struct device *dev,
419 struct device_attribute *dev_attr,
422 struct hv_device *hv_dev = device_to_hv_device(dev);
423 struct hv_ring_buffer_debug_info inbound;
425 if (!hv_dev->channel)
427 hv_ringbuffer_get_debuginfo(&hv_dev->channel->inbound, &inbound);
428 return sprintf(buf, "%d\n", inbound.bytes_avail_towrite);
430 static DEVICE_ATTR_RO(in_write_bytes_avail);
432 static ssize_t channel_vp_mapping_show(struct device *dev,
433 struct device_attribute *dev_attr,
436 struct hv_device *hv_dev = device_to_hv_device(dev);
437 struct vmbus_channel *channel = hv_dev->channel, *cur_sc;
439 int buf_size = PAGE_SIZE, n_written, tot_written;
440 struct list_head *cur;
445 tot_written = snprintf(buf, buf_size, "%u:%u\n",
446 channel->offermsg.child_relid, channel->target_cpu);
448 spin_lock_irqsave(&channel->lock, flags);
450 list_for_each(cur, &channel->sc_list) {
451 if (tot_written >= buf_size - 1)
454 cur_sc = list_entry(cur, struct vmbus_channel, sc_list);
455 n_written = scnprintf(buf + tot_written,
456 buf_size - tot_written,
458 cur_sc->offermsg.child_relid,
460 tot_written += n_written;
463 spin_unlock_irqrestore(&channel->lock, flags);
467 static DEVICE_ATTR_RO(channel_vp_mapping);
469 static ssize_t vendor_show(struct device *dev,
470 struct device_attribute *dev_attr,
473 struct hv_device *hv_dev = device_to_hv_device(dev);
474 return sprintf(buf, "0x%x\n", hv_dev->vendor_id);
476 static DEVICE_ATTR_RO(vendor);
478 static ssize_t device_show(struct device *dev,
479 struct device_attribute *dev_attr,
482 struct hv_device *hv_dev = device_to_hv_device(dev);
483 return sprintf(buf, "0x%x\n", hv_dev->device_id);
485 static DEVICE_ATTR_RO(device);
487 /* Set up per device attributes in /sys/bus/vmbus/devices/<bus device> */
488 static struct attribute *vmbus_dev_attrs[] = {
490 &dev_attr_state.attr,
491 &dev_attr_monitor_id.attr,
492 &dev_attr_class_id.attr,
493 &dev_attr_device_id.attr,
494 &dev_attr_modalias.attr,
495 &dev_attr_server_monitor_pending.attr,
496 &dev_attr_client_monitor_pending.attr,
497 &dev_attr_server_monitor_latency.attr,
498 &dev_attr_client_monitor_latency.attr,
499 &dev_attr_server_monitor_conn_id.attr,
500 &dev_attr_client_monitor_conn_id.attr,
501 &dev_attr_out_intr_mask.attr,
502 &dev_attr_out_read_index.attr,
503 &dev_attr_out_write_index.attr,
504 &dev_attr_out_read_bytes_avail.attr,
505 &dev_attr_out_write_bytes_avail.attr,
506 &dev_attr_in_intr_mask.attr,
507 &dev_attr_in_read_index.attr,
508 &dev_attr_in_write_index.attr,
509 &dev_attr_in_read_bytes_avail.attr,
510 &dev_attr_in_write_bytes_avail.attr,
511 &dev_attr_channel_vp_mapping.attr,
512 &dev_attr_vendor.attr,
513 &dev_attr_device.attr,
516 ATTRIBUTE_GROUPS(vmbus_dev);
519 * vmbus_uevent - add uevent for our device
521 * This routine is invoked when a device is added or removed on the vmbus to
522 * generate a uevent to udev in the userspace. The udev will then look at its
523 * rule and the uevent generated here to load the appropriate driver
525 * The alias string will be of the form vmbus:guid where guid is the string
526 * representation of the device guid (each byte of the guid will be
527 * represented with two hex characters.
529 static int vmbus_uevent(struct device *device, struct kobj_uevent_env *env)
531 struct hv_device *dev = device_to_hv_device(device);
533 char alias_name[VMBUS_ALIAS_LEN + 1];
535 print_alias_name(dev, alias_name);
536 ret = add_uevent_var(env, "MODALIAS=vmbus:%s", alias_name);
540 static const uuid_le null_guid;
542 static inline bool is_null_guid(const uuid_le *guid)
544 if (uuid_le_cmp(*guid, null_guid))
550 * Return a matching hv_vmbus_device_id pointer.
551 * If there is no match, return NULL.
553 static const struct hv_vmbus_device_id *hv_vmbus_get_id(struct hv_driver *drv,
556 const struct hv_vmbus_device_id *id = NULL;
557 struct vmbus_dynid *dynid;
559 /* Look at the dynamic ids first, before the static ones */
560 spin_lock(&drv->dynids.lock);
561 list_for_each_entry(dynid, &drv->dynids.list, node) {
562 if (!uuid_le_cmp(dynid->id.guid, *guid)) {
567 spin_unlock(&drv->dynids.lock);
574 return NULL; /* empty device table */
576 for (; !is_null_guid(&id->guid); id++)
577 if (!uuid_le_cmp(id->guid, *guid))
583 /* vmbus_add_dynid - add a new device ID to this driver and re-probe devices */
584 static int vmbus_add_dynid(struct hv_driver *drv, uuid_le *guid)
586 struct vmbus_dynid *dynid;
588 dynid = kzalloc(sizeof(*dynid), GFP_KERNEL);
592 dynid->id.guid = *guid;
594 spin_lock(&drv->dynids.lock);
595 list_add_tail(&dynid->node, &drv->dynids.list);
596 spin_unlock(&drv->dynids.lock);
598 return driver_attach(&drv->driver);
601 static void vmbus_free_dynids(struct hv_driver *drv)
603 struct vmbus_dynid *dynid, *n;
605 spin_lock(&drv->dynids.lock);
606 list_for_each_entry_safe(dynid, n, &drv->dynids.list, node) {
607 list_del(&dynid->node);
610 spin_unlock(&drv->dynids.lock);
614 * store_new_id - sysfs frontend to vmbus_add_dynid()
616 * Allow GUIDs to be added to an existing driver via sysfs.
618 static ssize_t new_id_store(struct device_driver *driver, const char *buf,
621 struct hv_driver *drv = drv_to_hv_drv(driver);
625 retval = uuid_le_to_bin(buf, &guid);
629 if (hv_vmbus_get_id(drv, &guid))
632 retval = vmbus_add_dynid(drv, &guid);
637 static DRIVER_ATTR_WO(new_id);
640 * store_remove_id - remove a PCI device ID from this driver
642 * Removes a dynamic pci device ID to this driver.
644 static ssize_t remove_id_store(struct device_driver *driver, const char *buf,
647 struct hv_driver *drv = drv_to_hv_drv(driver);
648 struct vmbus_dynid *dynid, *n;
652 retval = uuid_le_to_bin(buf, &guid);
657 spin_lock(&drv->dynids.lock);
658 list_for_each_entry_safe(dynid, n, &drv->dynids.list, node) {
659 struct hv_vmbus_device_id *id = &dynid->id;
661 if (!uuid_le_cmp(id->guid, guid)) {
662 list_del(&dynid->node);
668 spin_unlock(&drv->dynids.lock);
672 static DRIVER_ATTR_WO(remove_id);
674 static struct attribute *vmbus_drv_attrs[] = {
675 &driver_attr_new_id.attr,
676 &driver_attr_remove_id.attr,
679 ATTRIBUTE_GROUPS(vmbus_drv);
683 * vmbus_match - Attempt to match the specified device to the specified driver
685 static int vmbus_match(struct device *device, struct device_driver *driver)
687 struct hv_driver *drv = drv_to_hv_drv(driver);
688 struct hv_device *hv_dev = device_to_hv_device(device);
690 /* The hv_sock driver handles all hv_sock offers. */
691 if (is_hvsock_channel(hv_dev->channel))
694 if (hv_vmbus_get_id(drv, &hv_dev->dev_type))
701 * vmbus_probe - Add the new vmbus's child device
703 static int vmbus_probe(struct device *child_device)
706 struct hv_driver *drv =
707 drv_to_hv_drv(child_device->driver);
708 struct hv_device *dev = device_to_hv_device(child_device);
709 const struct hv_vmbus_device_id *dev_id;
711 dev_id = hv_vmbus_get_id(drv, &dev->dev_type);
713 ret = drv->probe(dev, dev_id);
715 pr_err("probe failed for device %s (%d)\n",
716 dev_name(child_device), ret);
719 pr_err("probe not set for driver %s\n",
720 dev_name(child_device));
727 * vmbus_remove - Remove a vmbus device
729 static int vmbus_remove(struct device *child_device)
731 struct hv_driver *drv;
732 struct hv_device *dev = device_to_hv_device(child_device);
734 if (child_device->driver) {
735 drv = drv_to_hv_drv(child_device->driver);
745 * vmbus_shutdown - Shutdown a vmbus device
747 static void vmbus_shutdown(struct device *child_device)
749 struct hv_driver *drv;
750 struct hv_device *dev = device_to_hv_device(child_device);
753 /* The device may not be attached yet */
754 if (!child_device->driver)
757 drv = drv_to_hv_drv(child_device->driver);
765 * vmbus_device_release - Final callback release of the vmbus child device
767 static void vmbus_device_release(struct device *device)
769 struct hv_device *hv_dev = device_to_hv_device(device);
770 struct vmbus_channel *channel = hv_dev->channel;
772 mutex_lock(&vmbus_connection.channel_mutex);
773 hv_process_channel_removal(channel->offermsg.child_relid);
774 mutex_unlock(&vmbus_connection.channel_mutex);
779 /* The one and only one */
780 static struct bus_type hv_bus = {
782 .match = vmbus_match,
783 .shutdown = vmbus_shutdown,
784 .remove = vmbus_remove,
785 .probe = vmbus_probe,
786 .uevent = vmbus_uevent,
787 .dev_groups = vmbus_dev_groups,
788 .drv_groups = vmbus_drv_groups,
791 struct onmessage_work_context {
792 struct work_struct work;
793 struct hv_message msg;
796 static void vmbus_onmessage_work(struct work_struct *work)
798 struct onmessage_work_context *ctx;
800 /* Do not process messages if we're in DISCONNECTED state */
801 if (vmbus_connection.conn_state == DISCONNECTED)
804 ctx = container_of(work, struct onmessage_work_context,
806 vmbus_onmessage(&ctx->msg);
810 static void hv_process_timer_expiration(struct hv_message *msg,
811 struct hv_per_cpu_context *hv_cpu)
813 struct clock_event_device *dev = hv_cpu->clk_evt;
815 if (dev->event_handler)
816 dev->event_handler(dev);
818 vmbus_signal_eom(msg, HVMSG_TIMER_EXPIRED);
821 void vmbus_on_msg_dpc(unsigned long data)
823 struct hv_per_cpu_context *hv_cpu = (void *)data;
824 void *page_addr = hv_cpu->synic_message_page;
825 struct hv_message *msg = (struct hv_message *)page_addr +
827 struct vmbus_channel_message_header *hdr;
828 const struct vmbus_channel_message_table_entry *entry;
829 struct onmessage_work_context *ctx;
830 u32 message_type = msg->header.message_type;
832 if (message_type == HVMSG_NONE)
836 hdr = (struct vmbus_channel_message_header *)msg->u.payload;
838 trace_vmbus_on_msg_dpc(hdr);
840 if (hdr->msgtype >= CHANNELMSG_COUNT) {
841 WARN_ONCE(1, "unknown msgtype=%d\n", hdr->msgtype);
845 entry = &channel_message_table[hdr->msgtype];
846 if (entry->handler_type == VMHT_BLOCKING) {
847 ctx = kmalloc(sizeof(*ctx), GFP_ATOMIC);
851 INIT_WORK(&ctx->work, vmbus_onmessage_work);
852 memcpy(&ctx->msg, msg, sizeof(*msg));
855 * The host can generate a rescind message while we
856 * may still be handling the original offer. We deal with
857 * this condition by ensuring the processing is done on the
860 switch (hdr->msgtype) {
861 case CHANNELMSG_RESCIND_CHANNELOFFER:
863 * If we are handling the rescind message;
864 * schedule the work on the global work queue.
866 schedule_work_on(vmbus_connection.connect_cpu,
870 case CHANNELMSG_OFFERCHANNEL:
871 atomic_inc(&vmbus_connection.offer_in_progress);
872 queue_work_on(vmbus_connection.connect_cpu,
873 vmbus_connection.work_queue,
878 queue_work(vmbus_connection.work_queue, &ctx->work);
881 entry->message_handler(hdr);
884 vmbus_signal_eom(msg, message_type);
889 * Direct callback for channels using other deferred processing
891 static void vmbus_channel_isr(struct vmbus_channel *channel)
893 void (*callback_fn)(void *);
895 callback_fn = READ_ONCE(channel->onchannel_callback);
896 if (likely(callback_fn != NULL))
897 (*callback_fn)(channel->channel_callback_context);
901 * Schedule all channels with events pending
903 static void vmbus_chan_sched(struct hv_per_cpu_context *hv_cpu)
905 unsigned long *recv_int_page;
908 if (vmbus_proto_version < VERSION_WIN8) {
909 maxbits = MAX_NUM_CHANNELS_SUPPORTED;
910 recv_int_page = vmbus_connection.recv_int_page;
913 * When the host is win8 and beyond, the event page
914 * can be directly checked to get the id of the channel
915 * that has the interrupt pending.
917 void *page_addr = hv_cpu->synic_event_page;
918 union hv_synic_event_flags *event
919 = (union hv_synic_event_flags *)page_addr +
922 maxbits = HV_EVENT_FLAGS_COUNT;
923 recv_int_page = event->flags;
926 if (unlikely(!recv_int_page))
929 for_each_set_bit(relid, recv_int_page, maxbits) {
930 struct vmbus_channel *channel;
932 if (!sync_test_and_clear_bit(relid, recv_int_page))
935 /* Special case - vmbus channel protocol msg */
941 /* Find channel based on relid */
942 list_for_each_entry_rcu(channel, &hv_cpu->chan_list, percpu_list) {
943 if (channel->offermsg.child_relid != relid)
946 if (channel->rescind)
949 trace_vmbus_chan_sched(channel);
951 ++channel->interrupts;
953 switch (channel->callback_mode) {
955 vmbus_channel_isr(channel);
958 case HV_CALL_BATCHED:
959 hv_begin_read(&channel->inbound);
962 tasklet_schedule(&channel->callback_event);
970 static void vmbus_isr(void)
972 struct hv_per_cpu_context *hv_cpu
973 = this_cpu_ptr(hv_context.cpu_context);
974 void *page_addr = hv_cpu->synic_event_page;
975 struct hv_message *msg;
976 union hv_synic_event_flags *event;
977 bool handled = false;
979 if (unlikely(page_addr == NULL))
982 event = (union hv_synic_event_flags *)page_addr +
985 * Check for events before checking for messages. This is the order
986 * in which events and messages are checked in Windows guests on
987 * Hyper-V, and the Windows team suggested we do the same.
990 if ((vmbus_proto_version == VERSION_WS2008) ||
991 (vmbus_proto_version == VERSION_WIN7)) {
993 /* Since we are a child, we only need to check bit 0 */
994 if (sync_test_and_clear_bit(0, event->flags))
998 * Our host is win8 or above. The signaling mechanism
999 * has changed and we can directly look at the event page.
1000 * If bit n is set then we have an interrup on the channel
1007 vmbus_chan_sched(hv_cpu);
1009 page_addr = hv_cpu->synic_message_page;
1010 msg = (struct hv_message *)page_addr + VMBUS_MESSAGE_SINT;
1012 /* Check if there are actual msgs to be processed */
1013 if (msg->header.message_type != HVMSG_NONE) {
1014 if (msg->header.message_type == HVMSG_TIMER_EXPIRED)
1015 hv_process_timer_expiration(msg, hv_cpu);
1017 tasklet_schedule(&hv_cpu->msg_dpc);
1020 add_interrupt_randomness(HYPERVISOR_CALLBACK_VECTOR, 0);
1025 * vmbus_bus_init -Main vmbus driver initialization routine.
1028 * - initialize the vmbus driver context
1029 * - invoke the vmbus hv main init routine
1030 * - retrieve the channel offers
1032 static int vmbus_bus_init(void)
1036 /* Hypervisor initialization...setup hypercall page..etc */
1039 pr_err("Unable to initialize the hypervisor - 0x%x\n", ret);
1043 ret = bus_register(&hv_bus);
1047 hv_setup_vmbus_irq(vmbus_isr);
1049 ret = hv_synic_alloc();
1053 * Initialize the per-cpu interrupt state and
1054 * connect to the host.
1056 ret = cpuhp_setup_state(CPUHP_AP_ONLINE_DYN, "x86/hyperv:online",
1057 hv_synic_init, hv_synic_cleanup);
1060 hyperv_cpuhp_online = ret;
1062 ret = vmbus_connect();
1067 * Only register if the crash MSRs are available
1069 if (ms_hyperv.misc_features & HV_FEATURE_GUEST_CRASH_MSR_AVAILABLE) {
1070 register_die_notifier(&hyperv_die_block);
1071 atomic_notifier_chain_register(&panic_notifier_list,
1072 &hyperv_panic_block);
1075 vmbus_request_offers();
1080 cpuhp_remove_state(hyperv_cpuhp_online);
1083 hv_remove_vmbus_irq();
1085 bus_unregister(&hv_bus);
1091 * __vmbus_child_driver_register() - Register a vmbus's driver
1092 * @hv_driver: Pointer to driver structure you want to register
1093 * @owner: owner module of the drv
1094 * @mod_name: module name string
1096 * Registers the given driver with Linux through the 'driver_register()' call
1097 * and sets up the hyper-v vmbus handling for this driver.
1098 * It will return the state of the 'driver_register()' call.
1101 int __vmbus_driver_register(struct hv_driver *hv_driver, struct module *owner, const char *mod_name)
1105 pr_info("registering driver %s\n", hv_driver->name);
1107 ret = vmbus_exists();
1111 hv_driver->driver.name = hv_driver->name;
1112 hv_driver->driver.owner = owner;
1113 hv_driver->driver.mod_name = mod_name;
1114 hv_driver->driver.bus = &hv_bus;
1116 spin_lock_init(&hv_driver->dynids.lock);
1117 INIT_LIST_HEAD(&hv_driver->dynids.list);
1119 ret = driver_register(&hv_driver->driver);
1123 EXPORT_SYMBOL_GPL(__vmbus_driver_register);
1126 * vmbus_driver_unregister() - Unregister a vmbus's driver
1127 * @hv_driver: Pointer to driver structure you want to
1130 * Un-register the given driver that was previous registered with a call to
1131 * vmbus_driver_register()
1133 void vmbus_driver_unregister(struct hv_driver *hv_driver)
1135 pr_info("unregistering driver %s\n", hv_driver->name);
1137 if (!vmbus_exists()) {
1138 driver_unregister(&hv_driver->driver);
1139 vmbus_free_dynids(hv_driver);
1142 EXPORT_SYMBOL_GPL(vmbus_driver_unregister);
1146 * Called when last reference to channel is gone.
1148 static void vmbus_chan_release(struct kobject *kobj)
1150 struct vmbus_channel *channel
1151 = container_of(kobj, struct vmbus_channel, kobj);
1153 kfree_rcu(channel, rcu);
1156 struct vmbus_chan_attribute {
1157 struct attribute attr;
1158 ssize_t (*show)(const struct vmbus_channel *chan, char *buf);
1159 ssize_t (*store)(struct vmbus_channel *chan,
1160 const char *buf, size_t count);
1162 #define VMBUS_CHAN_ATTR(_name, _mode, _show, _store) \
1163 struct vmbus_chan_attribute chan_attr_##_name \
1164 = __ATTR(_name, _mode, _show, _store)
1165 #define VMBUS_CHAN_ATTR_RW(_name) \
1166 struct vmbus_chan_attribute chan_attr_##_name = __ATTR_RW(_name)
1167 #define VMBUS_CHAN_ATTR_RO(_name) \
1168 struct vmbus_chan_attribute chan_attr_##_name = __ATTR_RO(_name)
1169 #define VMBUS_CHAN_ATTR_WO(_name) \
1170 struct vmbus_chan_attribute chan_attr_##_name = __ATTR_WO(_name)
1172 static ssize_t vmbus_chan_attr_show(struct kobject *kobj,
1173 struct attribute *attr, char *buf)
1175 const struct vmbus_chan_attribute *attribute
1176 = container_of(attr, struct vmbus_chan_attribute, attr);
1177 const struct vmbus_channel *chan
1178 = container_of(kobj, struct vmbus_channel, kobj);
1180 if (!attribute->show)
1183 return attribute->show(chan, buf);
1186 static const struct sysfs_ops vmbus_chan_sysfs_ops = {
1187 .show = vmbus_chan_attr_show,
1190 static ssize_t out_mask_show(const struct vmbus_channel *channel, char *buf)
1192 const struct hv_ring_buffer_info *rbi = &channel->outbound;
1194 return sprintf(buf, "%u\n", rbi->ring_buffer->interrupt_mask);
1196 VMBUS_CHAN_ATTR_RO(out_mask);
1198 static ssize_t in_mask_show(const struct vmbus_channel *channel, char *buf)
1200 const struct hv_ring_buffer_info *rbi = &channel->inbound;
1202 return sprintf(buf, "%u\n", rbi->ring_buffer->interrupt_mask);
1204 VMBUS_CHAN_ATTR_RO(in_mask);
1206 static ssize_t read_avail_show(const struct vmbus_channel *channel, char *buf)
1208 const struct hv_ring_buffer_info *rbi = &channel->inbound;
1210 return sprintf(buf, "%u\n", hv_get_bytes_to_read(rbi));
1212 VMBUS_CHAN_ATTR_RO(read_avail);
1214 static ssize_t write_avail_show(const struct vmbus_channel *channel, char *buf)
1216 const struct hv_ring_buffer_info *rbi = &channel->outbound;
1218 return sprintf(buf, "%u\n", hv_get_bytes_to_write(rbi));
1220 VMBUS_CHAN_ATTR_RO(write_avail);
1222 static ssize_t show_target_cpu(const struct vmbus_channel *channel, char *buf)
1224 return sprintf(buf, "%u\n", channel->target_cpu);
1226 VMBUS_CHAN_ATTR(cpu, S_IRUGO, show_target_cpu, NULL);
1228 static ssize_t channel_pending_show(const struct vmbus_channel *channel,
1231 return sprintf(buf, "%d\n",
1232 channel_pending(channel,
1233 vmbus_connection.monitor_pages[1]));
1235 VMBUS_CHAN_ATTR(pending, S_IRUGO, channel_pending_show, NULL);
1237 static ssize_t channel_latency_show(const struct vmbus_channel *channel,
1240 return sprintf(buf, "%d\n",
1241 channel_latency(channel,
1242 vmbus_connection.monitor_pages[1]));
1244 VMBUS_CHAN_ATTR(latency, S_IRUGO, channel_latency_show, NULL);
1246 static ssize_t channel_interrupts_show(const struct vmbus_channel *channel, char *buf)
1248 return sprintf(buf, "%llu\n", channel->interrupts);
1250 VMBUS_CHAN_ATTR(interrupts, S_IRUGO, channel_interrupts_show, NULL);
1252 static ssize_t channel_events_show(const struct vmbus_channel *channel, char *buf)
1254 return sprintf(buf, "%llu\n", channel->sig_events);
1256 VMBUS_CHAN_ATTR(events, S_IRUGO, channel_events_show, NULL);
1258 static struct attribute *vmbus_chan_attrs[] = {
1259 &chan_attr_out_mask.attr,
1260 &chan_attr_in_mask.attr,
1261 &chan_attr_read_avail.attr,
1262 &chan_attr_write_avail.attr,
1263 &chan_attr_cpu.attr,
1264 &chan_attr_pending.attr,
1265 &chan_attr_latency.attr,
1266 &chan_attr_interrupts.attr,
1267 &chan_attr_events.attr,
1271 static struct kobj_type vmbus_chan_ktype = {
1272 .sysfs_ops = &vmbus_chan_sysfs_ops,
1273 .release = vmbus_chan_release,
1274 .default_attrs = vmbus_chan_attrs,
1278 * vmbus_add_channel_kobj - setup a sub-directory under device/channels
1280 int vmbus_add_channel_kobj(struct hv_device *dev, struct vmbus_channel *channel)
1282 struct kobject *kobj = &channel->kobj;
1283 u32 relid = channel->offermsg.child_relid;
1286 kobj->kset = dev->channels_kset;
1287 ret = kobject_init_and_add(kobj, &vmbus_chan_ktype, NULL,
1292 kobject_uevent(kobj, KOBJ_ADD);
1298 * vmbus_device_create - Creates and registers a new child device
1301 struct hv_device *vmbus_device_create(const uuid_le *type,
1302 const uuid_le *instance,
1303 struct vmbus_channel *channel)
1305 struct hv_device *child_device_obj;
1307 child_device_obj = kzalloc(sizeof(struct hv_device), GFP_KERNEL);
1308 if (!child_device_obj) {
1309 pr_err("Unable to allocate device object for child device\n");
1313 child_device_obj->channel = channel;
1314 memcpy(&child_device_obj->dev_type, type, sizeof(uuid_le));
1315 memcpy(&child_device_obj->dev_instance, instance,
1317 child_device_obj->vendor_id = 0x1414; /* MSFT vendor ID */
1320 return child_device_obj;
1324 * vmbus_device_register - Register the child device
1326 int vmbus_device_register(struct hv_device *child_device_obj)
1328 struct kobject *kobj = &child_device_obj->device.kobj;
1331 dev_set_name(&child_device_obj->device, "%pUl",
1332 child_device_obj->channel->offermsg.offer.if_instance.b);
1334 child_device_obj->device.bus = &hv_bus;
1335 child_device_obj->device.parent = &hv_acpi_dev->dev;
1336 child_device_obj->device.release = vmbus_device_release;
1339 * Register with the LDM. This will kick off the driver/device
1340 * binding...which will eventually call vmbus_match() and vmbus_probe()
1342 ret = device_register(&child_device_obj->device);
1344 pr_err("Unable to register child device\n");
1348 child_device_obj->channels_kset = kset_create_and_add("channels",
1350 if (!child_device_obj->channels_kset) {
1352 goto err_dev_unregister;
1355 ret = vmbus_add_channel_kobj(child_device_obj,
1356 child_device_obj->channel);
1358 pr_err("Unable to register primary channeln");
1359 goto err_kset_unregister;
1364 err_kset_unregister:
1365 kset_unregister(child_device_obj->channels_kset);
1368 device_unregister(&child_device_obj->device);
1373 * vmbus_device_unregister - Remove the specified child device
1376 void vmbus_device_unregister(struct hv_device *device_obj)
1378 pr_debug("child device %s unregistered\n",
1379 dev_name(&device_obj->device));
1382 * Kick off the process of unregistering the device.
1383 * This will call vmbus_remove() and eventually vmbus_device_release()
1385 device_unregister(&device_obj->device);
1390 * VMBUS is an acpi enumerated device. Get the information we
1393 #define VTPM_BASE_ADDRESS 0xfed40000
1394 static acpi_status vmbus_walk_resources(struct acpi_resource *res, void *ctx)
1396 resource_size_t start = 0;
1397 resource_size_t end = 0;
1398 struct resource *new_res;
1399 struct resource **old_res = &hyperv_mmio;
1400 struct resource **prev_res = NULL;
1402 switch (res->type) {
1405 * "Address" descriptors are for bus windows. Ignore
1406 * "memory" descriptors, which are for registers on
1409 case ACPI_RESOURCE_TYPE_ADDRESS32:
1410 start = res->data.address32.address.minimum;
1411 end = res->data.address32.address.maximum;
1414 case ACPI_RESOURCE_TYPE_ADDRESS64:
1415 start = res->data.address64.address.minimum;
1416 end = res->data.address64.address.maximum;
1420 /* Unused resource type */
1425 * Ignore ranges that are below 1MB, as they're not
1426 * necessary or useful here.
1431 new_res = kzalloc(sizeof(*new_res), GFP_ATOMIC);
1433 return AE_NO_MEMORY;
1435 /* If this range overlaps the virtual TPM, truncate it. */
1436 if (end > VTPM_BASE_ADDRESS && start < VTPM_BASE_ADDRESS)
1437 end = VTPM_BASE_ADDRESS;
1439 new_res->name = "hyperv mmio";
1440 new_res->flags = IORESOURCE_MEM;
1441 new_res->start = start;
1445 * If two ranges are adjacent, merge them.
1453 if (((*old_res)->end + 1) == new_res->start) {
1454 (*old_res)->end = new_res->end;
1459 if ((*old_res)->start == new_res->end + 1) {
1460 (*old_res)->start = new_res->start;
1465 if ((*old_res)->start > new_res->end) {
1466 new_res->sibling = *old_res;
1468 (*prev_res)->sibling = new_res;
1474 old_res = &(*old_res)->sibling;
1481 static int vmbus_acpi_remove(struct acpi_device *device)
1483 struct resource *cur_res;
1484 struct resource *next_res;
1488 __release_region(hyperv_mmio, fb_mmio->start,
1489 resource_size(fb_mmio));
1493 for (cur_res = hyperv_mmio; cur_res; cur_res = next_res) {
1494 next_res = cur_res->sibling;
1502 static void vmbus_reserve_fb(void)
1506 * Make a claim for the frame buffer in the resource tree under the
1507 * first node, which will be the one below 4GB. The length seems to
1508 * be underreported, particularly in a Generation 1 VM. So start out
1509 * reserving a larger area and make it smaller until it succeeds.
1512 if (screen_info.lfb_base) {
1513 if (efi_enabled(EFI_BOOT))
1514 size = max_t(__u32, screen_info.lfb_size, 0x800000);
1516 size = max_t(__u32, screen_info.lfb_size, 0x4000000);
1518 for (; !fb_mmio && (size >= 0x100000); size >>= 1) {
1519 fb_mmio = __request_region(hyperv_mmio,
1520 screen_info.lfb_base, size,
1527 * vmbus_allocate_mmio() - Pick a memory-mapped I/O range.
1528 * @new: If successful, supplied a pointer to the
1529 * allocated MMIO space.
1530 * @device_obj: Identifies the caller
1531 * @min: Minimum guest physical address of the
1533 * @max: Maximum guest physical address
1534 * @size: Size of the range to be allocated
1535 * @align: Alignment of the range to be allocated
1536 * @fb_overlap_ok: Whether this allocation can be allowed
1537 * to overlap the video frame buffer.
1539 * This function walks the resources granted to VMBus by the
1540 * _CRS object in the ACPI namespace underneath the parent
1541 * "bridge" whether that's a root PCI bus in the Generation 1
1542 * case or a Module Device in the Generation 2 case. It then
1543 * attempts to allocate from the global MMIO pool in a way that
1544 * matches the constraints supplied in these parameters and by
1547 * Return: 0 on success, -errno on failure
1549 int vmbus_allocate_mmio(struct resource **new, struct hv_device *device_obj,
1550 resource_size_t min, resource_size_t max,
1551 resource_size_t size, resource_size_t align,
1554 struct resource *iter, *shadow;
1555 resource_size_t range_min, range_max, start;
1556 const char *dev_n = dev_name(&device_obj->device);
1560 down(&hyperv_mmio_lock);
1563 * If overlaps with frame buffers are allowed, then first attempt to
1564 * make the allocation from within the reserved region. Because it
1565 * is already reserved, no shadow allocation is necessary.
1567 if (fb_overlap_ok && fb_mmio && !(min > fb_mmio->end) &&
1568 !(max < fb_mmio->start)) {
1570 range_min = fb_mmio->start;
1571 range_max = fb_mmio->end;
1572 start = (range_min + align - 1) & ~(align - 1);
1573 for (; start + size - 1 <= range_max; start += align) {
1574 *new = request_mem_region_exclusive(start, size, dev_n);
1582 for (iter = hyperv_mmio; iter; iter = iter->sibling) {
1583 if ((iter->start >= max) || (iter->end <= min))
1586 range_min = iter->start;
1587 range_max = iter->end;
1588 start = (range_min + align - 1) & ~(align - 1);
1589 for (; start + size - 1 <= range_max; start += align) {
1590 shadow = __request_region(iter, start, size, NULL,
1595 *new = request_mem_region_exclusive(start, size, dev_n);
1597 shadow->name = (char *)*new;
1602 __release_region(iter, start, size);
1607 up(&hyperv_mmio_lock);
1610 EXPORT_SYMBOL_GPL(vmbus_allocate_mmio);
1613 * vmbus_free_mmio() - Free a memory-mapped I/O range.
1614 * @start: Base address of region to release.
1615 * @size: Size of the range to be allocated
1617 * This function releases anything requested by
1618 * vmbus_mmio_allocate().
1620 void vmbus_free_mmio(resource_size_t start, resource_size_t size)
1622 struct resource *iter;
1624 down(&hyperv_mmio_lock);
1625 for (iter = hyperv_mmio; iter; iter = iter->sibling) {
1626 if ((iter->start >= start + size) || (iter->end <= start))
1629 __release_region(iter, start, size);
1631 release_mem_region(start, size);
1632 up(&hyperv_mmio_lock);
1635 EXPORT_SYMBOL_GPL(vmbus_free_mmio);
1637 static int vmbus_acpi_add(struct acpi_device *device)
1640 int ret_val = -ENODEV;
1641 struct acpi_device *ancestor;
1643 hv_acpi_dev = device;
1645 result = acpi_walk_resources(device->handle, METHOD_NAME__CRS,
1646 vmbus_walk_resources, NULL);
1648 if (ACPI_FAILURE(result))
1651 * Some ancestor of the vmbus acpi device (Gen1 or Gen2
1652 * firmware) is the VMOD that has the mmio ranges. Get that.
1654 for (ancestor = device->parent; ancestor; ancestor = ancestor->parent) {
1655 result = acpi_walk_resources(ancestor->handle, METHOD_NAME__CRS,
1656 vmbus_walk_resources, NULL);
1658 if (ACPI_FAILURE(result))
1668 complete(&probe_event);
1670 vmbus_acpi_remove(device);
1674 static const struct acpi_device_id vmbus_acpi_device_ids[] = {
1679 MODULE_DEVICE_TABLE(acpi, vmbus_acpi_device_ids);
1681 static struct acpi_driver vmbus_acpi_driver = {
1683 .ids = vmbus_acpi_device_ids,
1685 .add = vmbus_acpi_add,
1686 .remove = vmbus_acpi_remove,
1690 static void hv_kexec_handler(void)
1692 hv_synic_clockevents_cleanup();
1693 vmbus_initiate_unload(false);
1694 vmbus_connection.conn_state = DISCONNECTED;
1695 /* Make sure conn_state is set as hv_synic_cleanup checks for it */
1697 cpuhp_remove_state(hyperv_cpuhp_online);
1701 static void hv_crash_handler(struct pt_regs *regs)
1703 vmbus_initiate_unload(true);
1705 * In crash handler we can't schedule synic cleanup for all CPUs,
1706 * doing the cleanup for current CPU only. This should be sufficient
1709 vmbus_connection.conn_state = DISCONNECTED;
1710 hv_synic_cleanup(smp_processor_id());
1714 static int __init hv_acpi_init(void)
1718 if (x86_hyper_type != X86_HYPER_MS_HYPERV)
1721 init_completion(&probe_event);
1724 * Get ACPI resources first.
1726 ret = acpi_bus_register_driver(&vmbus_acpi_driver);
1731 t = wait_for_completion_timeout(&probe_event, 5*HZ);
1737 ret = vmbus_bus_init();
1741 hv_setup_kexec_handler(hv_kexec_handler);
1742 hv_setup_crash_handler(hv_crash_handler);
1747 acpi_bus_unregister_driver(&vmbus_acpi_driver);
1752 static void __exit vmbus_exit(void)
1756 hv_remove_kexec_handler();
1757 hv_remove_crash_handler();
1758 vmbus_connection.conn_state = DISCONNECTED;
1759 hv_synic_clockevents_cleanup();
1761 hv_remove_vmbus_irq();
1762 for_each_online_cpu(cpu) {
1763 struct hv_per_cpu_context *hv_cpu
1764 = per_cpu_ptr(hv_context.cpu_context, cpu);
1766 tasklet_kill(&hv_cpu->msg_dpc);
1768 vmbus_free_channels();
1770 if (ms_hyperv.misc_features & HV_FEATURE_GUEST_CRASH_MSR_AVAILABLE) {
1771 unregister_die_notifier(&hyperv_die_block);
1772 atomic_notifier_chain_unregister(&panic_notifier_list,
1773 &hyperv_panic_block);
1775 bus_unregister(&hv_bus);
1777 cpuhp_remove_state(hyperv_cpuhp_online);
1779 acpi_bus_unregister_driver(&vmbus_acpi_driver);
1783 MODULE_LICENSE("GPL");
1785 subsys_initcall(hv_acpi_init);
1786 module_exit(vmbus_exit);