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 <asm/hyperv.h>
38 #include <asm/hypervisor.h>
39 #include <asm/mshyperv.h>
40 #include <linux/notifier.h>
41 #include <linux/ptrace.h>
42 #include <linux/screen_info.h>
43 #include <linux/kdebug.h>
44 #include <linux/efi.h>
45 #include "hyperv_vmbus.h"
47 static struct acpi_device *hv_acpi_dev;
49 static struct completion probe_event;
52 static void hyperv_report_panic(struct pt_regs *regs)
54 static bool panic_reported;
57 * We prefer to report panic on 'die' chain as we have proper
58 * registers to report, but if we miss it (e.g. on BUG()) we need
59 * to report it on 'panic'.
63 panic_reported = true;
65 wrmsrl(HV_X64_MSR_CRASH_P0, regs->ip);
66 wrmsrl(HV_X64_MSR_CRASH_P1, regs->ax);
67 wrmsrl(HV_X64_MSR_CRASH_P2, regs->bx);
68 wrmsrl(HV_X64_MSR_CRASH_P3, regs->cx);
69 wrmsrl(HV_X64_MSR_CRASH_P4, regs->dx);
72 * Let Hyper-V know there is crash data available
74 wrmsrl(HV_X64_MSR_CRASH_CTL, HV_CRASH_CTL_CRASH_NOTIFY);
77 static int hyperv_panic_event(struct notifier_block *nb, unsigned long val,
82 regs = current_pt_regs();
84 hyperv_report_panic(regs);
88 static int hyperv_die_event(struct notifier_block *nb, unsigned long val,
91 struct die_args *die = (struct die_args *)args;
92 struct pt_regs *regs = die->regs;
94 hyperv_report_panic(regs);
98 static struct notifier_block hyperv_die_block = {
99 .notifier_call = hyperv_die_event,
101 static struct notifier_block hyperv_panic_block = {
102 .notifier_call = hyperv_panic_event,
105 static const char *fb_mmio_name = "fb_range";
106 static struct resource *fb_mmio;
107 struct resource *hyperv_mmio;
108 DEFINE_SEMAPHORE(hyperv_mmio_lock);
110 static int vmbus_exists(void)
112 if (hv_acpi_dev == NULL)
118 #define VMBUS_ALIAS_LEN ((sizeof((struct hv_vmbus_device_id *)0)->guid) * 2)
119 static void print_alias_name(struct hv_device *hv_dev, char *alias_name)
122 for (i = 0; i < VMBUS_ALIAS_LEN; i += 2)
123 sprintf(&alias_name[i], "%02x", hv_dev->dev_type.b[i/2]);
126 static u8 channel_monitor_group(struct vmbus_channel *channel)
128 return (u8)channel->offermsg.monitorid / 32;
131 static u8 channel_monitor_offset(struct vmbus_channel *channel)
133 return (u8)channel->offermsg.monitorid % 32;
136 static u32 channel_pending(struct vmbus_channel *channel,
137 struct hv_monitor_page *monitor_page)
139 u8 monitor_group = channel_monitor_group(channel);
140 return monitor_page->trigger_group[monitor_group].pending;
143 static u32 channel_latency(struct vmbus_channel *channel,
144 struct hv_monitor_page *monitor_page)
146 u8 monitor_group = channel_monitor_group(channel);
147 u8 monitor_offset = channel_monitor_offset(channel);
148 return monitor_page->latency[monitor_group][monitor_offset];
151 static u32 channel_conn_id(struct vmbus_channel *channel,
152 struct hv_monitor_page *monitor_page)
154 u8 monitor_group = channel_monitor_group(channel);
155 u8 monitor_offset = channel_monitor_offset(channel);
156 return monitor_page->parameter[monitor_group][monitor_offset].connectionid.u.id;
159 static ssize_t id_show(struct device *dev, struct device_attribute *dev_attr,
162 struct hv_device *hv_dev = device_to_hv_device(dev);
164 if (!hv_dev->channel)
166 return sprintf(buf, "%d\n", hv_dev->channel->offermsg.child_relid);
168 static DEVICE_ATTR_RO(id);
170 static ssize_t state_show(struct device *dev, struct device_attribute *dev_attr,
173 struct hv_device *hv_dev = device_to_hv_device(dev);
175 if (!hv_dev->channel)
177 return sprintf(buf, "%d\n", hv_dev->channel->state);
179 static DEVICE_ATTR_RO(state);
181 static ssize_t monitor_id_show(struct device *dev,
182 struct device_attribute *dev_attr, char *buf)
184 struct hv_device *hv_dev = device_to_hv_device(dev);
186 if (!hv_dev->channel)
188 return sprintf(buf, "%d\n", hv_dev->channel->offermsg.monitorid);
190 static DEVICE_ATTR_RO(monitor_id);
192 static ssize_t class_id_show(struct device *dev,
193 struct device_attribute *dev_attr, char *buf)
195 struct hv_device *hv_dev = device_to_hv_device(dev);
197 if (!hv_dev->channel)
199 return sprintf(buf, "{%pUl}\n",
200 hv_dev->channel->offermsg.offer.if_type.b);
202 static DEVICE_ATTR_RO(class_id);
204 static ssize_t device_id_show(struct device *dev,
205 struct device_attribute *dev_attr, char *buf)
207 struct hv_device *hv_dev = device_to_hv_device(dev);
209 if (!hv_dev->channel)
211 return sprintf(buf, "{%pUl}\n",
212 hv_dev->channel->offermsg.offer.if_instance.b);
214 static DEVICE_ATTR_RO(device_id);
216 static ssize_t modalias_show(struct device *dev,
217 struct device_attribute *dev_attr, char *buf)
219 struct hv_device *hv_dev = device_to_hv_device(dev);
220 char alias_name[VMBUS_ALIAS_LEN + 1];
222 print_alias_name(hv_dev, alias_name);
223 return sprintf(buf, "vmbus:%s\n", alias_name);
225 static DEVICE_ATTR_RO(modalias);
227 static ssize_t server_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(server_monitor_pending);
241 static ssize_t client_monitor_pending_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_pending(hv_dev->channel,
251 vmbus_connection.monitor_pages[1]));
253 static DEVICE_ATTR_RO(client_monitor_pending);
255 static ssize_t server_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[0]));
267 static DEVICE_ATTR_RO(server_monitor_latency);
269 static ssize_t client_monitor_latency_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_latency(hv_dev->channel,
279 vmbus_connection.monitor_pages[1]));
281 static DEVICE_ATTR_RO(client_monitor_latency);
283 static ssize_t server_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[0]));
295 static DEVICE_ATTR_RO(server_monitor_conn_id);
297 static ssize_t client_monitor_conn_id_show(struct device *dev,
298 struct device_attribute *dev_attr,
301 struct hv_device *hv_dev = device_to_hv_device(dev);
303 if (!hv_dev->channel)
305 return sprintf(buf, "%d\n",
306 channel_conn_id(hv_dev->channel,
307 vmbus_connection.monitor_pages[1]));
309 static DEVICE_ATTR_RO(client_monitor_conn_id);
311 static ssize_t out_intr_mask_show(struct device *dev,
312 struct device_attribute *dev_attr, char *buf)
314 struct hv_device *hv_dev = device_to_hv_device(dev);
315 struct hv_ring_buffer_debug_info outbound;
317 if (!hv_dev->channel)
319 hv_ringbuffer_get_debuginfo(&hv_dev->channel->outbound, &outbound);
320 return sprintf(buf, "%d\n", outbound.current_interrupt_mask);
322 static DEVICE_ATTR_RO(out_intr_mask);
324 static ssize_t out_read_index_show(struct device *dev,
325 struct device_attribute *dev_attr, char *buf)
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_read_index);
335 static DEVICE_ATTR_RO(out_read_index);
337 static ssize_t out_write_index_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.current_write_index);
349 static DEVICE_ATTR_RO(out_write_index);
351 static ssize_t out_read_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_toread);
363 static DEVICE_ATTR_RO(out_read_bytes_avail);
365 static ssize_t out_write_bytes_avail_show(struct device *dev,
366 struct device_attribute *dev_attr,
369 struct hv_device *hv_dev = device_to_hv_device(dev);
370 struct hv_ring_buffer_debug_info outbound;
372 if (!hv_dev->channel)
374 hv_ringbuffer_get_debuginfo(&hv_dev->channel->outbound, &outbound);
375 return sprintf(buf, "%d\n", outbound.bytes_avail_towrite);
377 static DEVICE_ATTR_RO(out_write_bytes_avail);
379 static ssize_t in_intr_mask_show(struct device *dev,
380 struct device_attribute *dev_attr, char *buf)
382 struct hv_device *hv_dev = device_to_hv_device(dev);
383 struct hv_ring_buffer_debug_info inbound;
385 if (!hv_dev->channel)
387 hv_ringbuffer_get_debuginfo(&hv_dev->channel->inbound, &inbound);
388 return sprintf(buf, "%d\n", inbound.current_interrupt_mask);
390 static DEVICE_ATTR_RO(in_intr_mask);
392 static ssize_t in_read_index_show(struct device *dev,
393 struct device_attribute *dev_attr, char *buf)
395 struct hv_device *hv_dev = device_to_hv_device(dev);
396 struct hv_ring_buffer_debug_info inbound;
398 if (!hv_dev->channel)
400 hv_ringbuffer_get_debuginfo(&hv_dev->channel->inbound, &inbound);
401 return sprintf(buf, "%d\n", inbound.current_read_index);
403 static DEVICE_ATTR_RO(in_read_index);
405 static ssize_t in_write_index_show(struct device *dev,
406 struct device_attribute *dev_attr, char *buf)
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.current_write_index);
416 static DEVICE_ATTR_RO(in_write_index);
418 static ssize_t in_read_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_toread);
430 static DEVICE_ATTR_RO(in_read_bytes_avail);
432 static ssize_t in_write_bytes_avail_show(struct device *dev,
433 struct device_attribute *dev_attr,
436 struct hv_device *hv_dev = device_to_hv_device(dev);
437 struct hv_ring_buffer_debug_info inbound;
439 if (!hv_dev->channel)
441 hv_ringbuffer_get_debuginfo(&hv_dev->channel->inbound, &inbound);
442 return sprintf(buf, "%d\n", inbound.bytes_avail_towrite);
444 static DEVICE_ATTR_RO(in_write_bytes_avail);
446 static ssize_t channel_vp_mapping_show(struct device *dev,
447 struct device_attribute *dev_attr,
450 struct hv_device *hv_dev = device_to_hv_device(dev);
451 struct vmbus_channel *channel = hv_dev->channel, *cur_sc;
453 int buf_size = PAGE_SIZE, n_written, tot_written;
454 struct list_head *cur;
459 tot_written = snprintf(buf, buf_size, "%u:%u\n",
460 channel->offermsg.child_relid, channel->target_cpu);
462 spin_lock_irqsave(&channel->lock, flags);
464 list_for_each(cur, &channel->sc_list) {
465 if (tot_written >= buf_size - 1)
468 cur_sc = list_entry(cur, struct vmbus_channel, sc_list);
469 n_written = scnprintf(buf + tot_written,
470 buf_size - tot_written,
472 cur_sc->offermsg.child_relid,
474 tot_written += n_written;
477 spin_unlock_irqrestore(&channel->lock, flags);
481 static DEVICE_ATTR_RO(channel_vp_mapping);
483 static ssize_t vendor_show(struct device *dev,
484 struct device_attribute *dev_attr,
487 struct hv_device *hv_dev = device_to_hv_device(dev);
488 return sprintf(buf, "0x%x\n", hv_dev->vendor_id);
490 static DEVICE_ATTR_RO(vendor);
492 static ssize_t device_show(struct device *dev,
493 struct device_attribute *dev_attr,
496 struct hv_device *hv_dev = device_to_hv_device(dev);
497 return sprintf(buf, "0x%x\n", hv_dev->device_id);
499 static DEVICE_ATTR_RO(device);
501 /* Set up per device attributes in /sys/bus/vmbus/devices/<bus device> */
502 static struct attribute *vmbus_attrs[] = {
504 &dev_attr_state.attr,
505 &dev_attr_monitor_id.attr,
506 &dev_attr_class_id.attr,
507 &dev_attr_device_id.attr,
508 &dev_attr_modalias.attr,
509 &dev_attr_server_monitor_pending.attr,
510 &dev_attr_client_monitor_pending.attr,
511 &dev_attr_server_monitor_latency.attr,
512 &dev_attr_client_monitor_latency.attr,
513 &dev_attr_server_monitor_conn_id.attr,
514 &dev_attr_client_monitor_conn_id.attr,
515 &dev_attr_out_intr_mask.attr,
516 &dev_attr_out_read_index.attr,
517 &dev_attr_out_write_index.attr,
518 &dev_attr_out_read_bytes_avail.attr,
519 &dev_attr_out_write_bytes_avail.attr,
520 &dev_attr_in_intr_mask.attr,
521 &dev_attr_in_read_index.attr,
522 &dev_attr_in_write_index.attr,
523 &dev_attr_in_read_bytes_avail.attr,
524 &dev_attr_in_write_bytes_avail.attr,
525 &dev_attr_channel_vp_mapping.attr,
526 &dev_attr_vendor.attr,
527 &dev_attr_device.attr,
530 ATTRIBUTE_GROUPS(vmbus);
533 * vmbus_uevent - add uevent for our device
535 * This routine is invoked when a device is added or removed on the vmbus to
536 * generate a uevent to udev in the userspace. The udev will then look at its
537 * rule and the uevent generated here to load the appropriate driver
539 * The alias string will be of the form vmbus:guid where guid is the string
540 * representation of the device guid (each byte of the guid will be
541 * represented with two hex characters.
543 static int vmbus_uevent(struct device *device, struct kobj_uevent_env *env)
545 struct hv_device *dev = device_to_hv_device(device);
547 char alias_name[VMBUS_ALIAS_LEN + 1];
549 print_alias_name(dev, alias_name);
550 ret = add_uevent_var(env, "MODALIAS=vmbus:%s", alias_name);
554 static const uuid_le null_guid;
556 static inline bool is_null_guid(const uuid_le *guid)
558 if (uuid_le_cmp(*guid, null_guid))
564 * Return a matching hv_vmbus_device_id pointer.
565 * If there is no match, return NULL.
567 static const struct hv_vmbus_device_id *hv_vmbus_get_id(
568 const struct hv_vmbus_device_id *id,
571 for (; !is_null_guid(&id->guid); id++)
572 if (!uuid_le_cmp(id->guid, *guid))
581 * vmbus_match - Attempt to match the specified device to the specified driver
583 static int vmbus_match(struct device *device, struct device_driver *driver)
585 struct hv_driver *drv = drv_to_hv_drv(driver);
586 struct hv_device *hv_dev = device_to_hv_device(device);
588 /* The hv_sock driver handles all hv_sock offers. */
589 if (is_hvsock_channel(hv_dev->channel))
592 if (hv_vmbus_get_id(drv->id_table, &hv_dev->dev_type))
599 * vmbus_probe - Add the new vmbus's child device
601 static int vmbus_probe(struct device *child_device)
604 struct hv_driver *drv =
605 drv_to_hv_drv(child_device->driver);
606 struct hv_device *dev = device_to_hv_device(child_device);
607 const struct hv_vmbus_device_id *dev_id;
609 dev_id = hv_vmbus_get_id(drv->id_table, &dev->dev_type);
611 ret = drv->probe(dev, dev_id);
613 pr_err("probe failed for device %s (%d)\n",
614 dev_name(child_device), ret);
617 pr_err("probe not set for driver %s\n",
618 dev_name(child_device));
625 * vmbus_remove - Remove a vmbus device
627 static int vmbus_remove(struct device *child_device)
629 struct hv_driver *drv;
630 struct hv_device *dev = device_to_hv_device(child_device);
632 if (child_device->driver) {
633 drv = drv_to_hv_drv(child_device->driver);
643 * vmbus_shutdown - Shutdown a vmbus device
645 static void vmbus_shutdown(struct device *child_device)
647 struct hv_driver *drv;
648 struct hv_device *dev = device_to_hv_device(child_device);
651 /* The device may not be attached yet */
652 if (!child_device->driver)
655 drv = drv_to_hv_drv(child_device->driver);
665 * vmbus_device_release - Final callback release of the vmbus child device
667 static void vmbus_device_release(struct device *device)
669 struct hv_device *hv_dev = device_to_hv_device(device);
670 struct vmbus_channel *channel = hv_dev->channel;
672 hv_process_channel_removal(channel,
673 channel->offermsg.child_relid);
678 /* The one and only one */
679 static struct bus_type hv_bus = {
681 .match = vmbus_match,
682 .shutdown = vmbus_shutdown,
683 .remove = vmbus_remove,
684 .probe = vmbus_probe,
685 .uevent = vmbus_uevent,
686 .dev_groups = vmbus_groups,
689 struct onmessage_work_context {
690 struct work_struct work;
691 struct hv_message msg;
694 static void vmbus_onmessage_work(struct work_struct *work)
696 struct onmessage_work_context *ctx;
698 /* Do not process messages if we're in DISCONNECTED state */
699 if (vmbus_connection.conn_state == DISCONNECTED)
702 ctx = container_of(work, struct onmessage_work_context,
704 vmbus_onmessage(&ctx->msg);
708 static void hv_process_timer_expiration(struct hv_message *msg, int cpu)
710 struct clock_event_device *dev = hv_context.clk_evt[cpu];
712 if (dev->event_handler)
713 dev->event_handler(dev);
715 vmbus_signal_eom(msg, HVMSG_TIMER_EXPIRED);
718 void vmbus_on_msg_dpc(unsigned long data)
720 int cpu = smp_processor_id();
721 void *page_addr = hv_context.synic_message_page[cpu];
722 struct hv_message *msg = (struct hv_message *)page_addr +
724 struct vmbus_channel_message_header *hdr;
725 struct vmbus_channel_message_table_entry *entry;
726 struct onmessage_work_context *ctx;
727 u32 message_type = msg->header.message_type;
729 if (message_type == HVMSG_NONE)
733 hdr = (struct vmbus_channel_message_header *)msg->u.payload;
735 if (hdr->msgtype >= CHANNELMSG_COUNT) {
736 WARN_ONCE(1, "unknown msgtype=%d\n", hdr->msgtype);
740 entry = &channel_message_table[hdr->msgtype];
741 if (entry->handler_type == VMHT_BLOCKING) {
742 ctx = kmalloc(sizeof(*ctx), GFP_ATOMIC);
746 INIT_WORK(&ctx->work, vmbus_onmessage_work);
747 memcpy(&ctx->msg, msg, sizeof(*msg));
749 queue_work(vmbus_connection.work_queue, &ctx->work);
751 entry->message_handler(hdr);
754 vmbus_signal_eom(msg, message_type);
757 static void vmbus_isr(void)
759 int cpu = smp_processor_id();
761 struct hv_message *msg;
762 union hv_synic_event_flags *event;
763 bool handled = false;
765 page_addr = hv_context.synic_event_page[cpu];
766 if (page_addr == NULL)
769 event = (union hv_synic_event_flags *)page_addr +
772 * Check for events before checking for messages. This is the order
773 * in which events and messages are checked in Windows guests on
774 * Hyper-V, and the Windows team suggested we do the same.
777 if ((vmbus_proto_version == VERSION_WS2008) ||
778 (vmbus_proto_version == VERSION_WIN7)) {
780 /* Since we are a child, we only need to check bit 0 */
781 if (sync_test_and_clear_bit(0,
782 (unsigned long *) &event->flags32[0])) {
787 * Our host is win8 or above. The signaling mechanism
788 * has changed and we can directly look at the event page.
789 * If bit n is set then we have an interrup on the channel
796 tasklet_schedule(hv_context.event_dpc[cpu]);
799 page_addr = hv_context.synic_message_page[cpu];
800 msg = (struct hv_message *)page_addr + VMBUS_MESSAGE_SINT;
802 /* Check if there are actual msgs to be processed */
803 if (msg->header.message_type != HVMSG_NONE) {
804 if (msg->header.message_type == HVMSG_TIMER_EXPIRED)
805 hv_process_timer_expiration(msg, cpu);
807 tasklet_schedule(hv_context.msg_dpc[cpu]);
813 * vmbus_bus_init -Main vmbus driver initialization routine.
816 * - initialize the vmbus driver context
817 * - invoke the vmbus hv main init routine
818 * - retrieve the channel offers
820 static int vmbus_bus_init(void)
824 /* Hypervisor initialization...setup hypercall page..etc */
827 pr_err("Unable to initialize the hypervisor - 0x%x\n", ret);
831 ret = bus_register(&hv_bus);
835 hv_setup_vmbus_irq(vmbus_isr);
837 ret = hv_synic_alloc();
841 * Initialize the per-cpu interrupt state and
842 * connect to the host.
844 on_each_cpu(hv_synic_init, NULL, 1);
845 ret = vmbus_connect();
849 if (vmbus_proto_version > VERSION_WIN7)
850 cpu_hotplug_disable();
853 * Only register if the crash MSRs are available
855 if (ms_hyperv.misc_features & HV_FEATURE_GUEST_CRASH_MSR_AVAILABLE) {
856 register_die_notifier(&hyperv_die_block);
857 atomic_notifier_chain_register(&panic_notifier_list,
858 &hyperv_panic_block);
861 vmbus_request_offers();
866 on_each_cpu(hv_synic_cleanup, NULL, 1);
869 hv_remove_vmbus_irq();
871 bus_unregister(&hv_bus);
880 * __vmbus_child_driver_register() - Register a vmbus's driver
881 * @hv_driver: Pointer to driver structure you want to register
882 * @owner: owner module of the drv
883 * @mod_name: module name string
885 * Registers the given driver with Linux through the 'driver_register()' call
886 * and sets up the hyper-v vmbus handling for this driver.
887 * It will return the state of the 'driver_register()' call.
890 int __vmbus_driver_register(struct hv_driver *hv_driver, struct module *owner, const char *mod_name)
894 pr_info("registering driver %s\n", hv_driver->name);
896 ret = vmbus_exists();
900 hv_driver->driver.name = hv_driver->name;
901 hv_driver->driver.owner = owner;
902 hv_driver->driver.mod_name = mod_name;
903 hv_driver->driver.bus = &hv_bus;
905 ret = driver_register(&hv_driver->driver);
909 EXPORT_SYMBOL_GPL(__vmbus_driver_register);
912 * vmbus_driver_unregister() - Unregister a vmbus's driver
913 * @hv_driver: Pointer to driver structure you want to
916 * Un-register the given driver that was previous registered with a call to
917 * vmbus_driver_register()
919 void vmbus_driver_unregister(struct hv_driver *hv_driver)
921 pr_info("unregistering driver %s\n", hv_driver->name);
924 driver_unregister(&hv_driver->driver);
926 EXPORT_SYMBOL_GPL(vmbus_driver_unregister);
929 * vmbus_device_create - Creates and registers a new child device
932 struct hv_device *vmbus_device_create(const uuid_le *type,
933 const uuid_le *instance,
934 struct vmbus_channel *channel)
936 struct hv_device *child_device_obj;
938 child_device_obj = kzalloc(sizeof(struct hv_device), GFP_KERNEL);
939 if (!child_device_obj) {
940 pr_err("Unable to allocate device object for child device\n");
944 child_device_obj->channel = channel;
945 memcpy(&child_device_obj->dev_type, type, sizeof(uuid_le));
946 memcpy(&child_device_obj->dev_instance, instance,
948 child_device_obj->vendor_id = 0x1414; /* MSFT vendor ID */
951 return child_device_obj;
955 * vmbus_device_register - Register the child device
957 int vmbus_device_register(struct hv_device *child_device_obj)
961 dev_set_name(&child_device_obj->device, "vmbus_%d",
962 child_device_obj->channel->id);
964 child_device_obj->device.bus = &hv_bus;
965 child_device_obj->device.parent = &hv_acpi_dev->dev;
966 child_device_obj->device.release = vmbus_device_release;
969 * Register with the LDM. This will kick off the driver/device
970 * binding...which will eventually call vmbus_match() and vmbus_probe()
972 ret = device_register(&child_device_obj->device);
975 pr_err("Unable to register child device\n");
977 pr_debug("child device %s registered\n",
978 dev_name(&child_device_obj->device));
984 * vmbus_device_unregister - Remove the specified child device
987 void vmbus_device_unregister(struct hv_device *device_obj)
989 pr_debug("child device %s unregistered\n",
990 dev_name(&device_obj->device));
993 * Kick off the process of unregistering the device.
994 * This will call vmbus_remove() and eventually vmbus_device_release()
996 device_unregister(&device_obj->device);
1001 * VMBUS is an acpi enumerated device. Get the information we
1004 #define VTPM_BASE_ADDRESS 0xfed40000
1005 static acpi_status vmbus_walk_resources(struct acpi_resource *res, void *ctx)
1007 resource_size_t start = 0;
1008 resource_size_t end = 0;
1009 struct resource *new_res;
1010 struct resource **old_res = &hyperv_mmio;
1011 struct resource **prev_res = NULL;
1013 switch (res->type) {
1016 * "Address" descriptors are for bus windows. Ignore
1017 * "memory" descriptors, which are for registers on
1020 case ACPI_RESOURCE_TYPE_ADDRESS32:
1021 start = res->data.address32.address.minimum;
1022 end = res->data.address32.address.maximum;
1025 case ACPI_RESOURCE_TYPE_ADDRESS64:
1026 start = res->data.address64.address.minimum;
1027 end = res->data.address64.address.maximum;
1031 /* Unused resource type */
1036 * Ignore ranges that are below 1MB, as they're not
1037 * necessary or useful here.
1042 new_res = kzalloc(sizeof(*new_res), GFP_ATOMIC);
1044 return AE_NO_MEMORY;
1046 /* If this range overlaps the virtual TPM, truncate it. */
1047 if (end > VTPM_BASE_ADDRESS && start < VTPM_BASE_ADDRESS)
1048 end = VTPM_BASE_ADDRESS;
1050 new_res->name = "hyperv mmio";
1051 new_res->flags = IORESOURCE_MEM;
1052 new_res->start = start;
1056 * If two ranges are adjacent, merge them.
1064 if (((*old_res)->end + 1) == new_res->start) {
1065 (*old_res)->end = new_res->end;
1070 if ((*old_res)->start == new_res->end + 1) {
1071 (*old_res)->start = new_res->start;
1076 if ((*old_res)->start > new_res->end) {
1077 new_res->sibling = *old_res;
1079 (*prev_res)->sibling = new_res;
1085 old_res = &(*old_res)->sibling;
1092 static int vmbus_acpi_remove(struct acpi_device *device)
1094 struct resource *cur_res;
1095 struct resource *next_res;
1099 __release_region(hyperv_mmio, fb_mmio->start,
1100 resource_size(fb_mmio));
1104 for (cur_res = hyperv_mmio; cur_res; cur_res = next_res) {
1105 next_res = cur_res->sibling;
1113 static void vmbus_reserve_fb(void)
1117 * Make a claim for the frame buffer in the resource tree under the
1118 * first node, which will be the one below 4GB. The length seems to
1119 * be underreported, particularly in a Generation 1 VM. So start out
1120 * reserving a larger area and make it smaller until it succeeds.
1123 if (screen_info.lfb_base) {
1124 if (efi_enabled(EFI_BOOT))
1125 size = max_t(__u32, screen_info.lfb_size, 0x800000);
1127 size = max_t(__u32, screen_info.lfb_size, 0x4000000);
1129 for (; !fb_mmio && (size >= 0x100000); size >>= 1) {
1130 fb_mmio = __request_region(hyperv_mmio,
1131 screen_info.lfb_base, size,
1138 * vmbus_allocate_mmio() - Pick a memory-mapped I/O range.
1139 * @new: If successful, supplied a pointer to the
1140 * allocated MMIO space.
1141 * @device_obj: Identifies the caller
1142 * @min: Minimum guest physical address of the
1144 * @max: Maximum guest physical address
1145 * @size: Size of the range to be allocated
1146 * @align: Alignment of the range to be allocated
1147 * @fb_overlap_ok: Whether this allocation can be allowed
1148 * to overlap the video frame buffer.
1150 * This function walks the resources granted to VMBus by the
1151 * _CRS object in the ACPI namespace underneath the parent
1152 * "bridge" whether that's a root PCI bus in the Generation 1
1153 * case or a Module Device in the Generation 2 case. It then
1154 * attempts to allocate from the global MMIO pool in a way that
1155 * matches the constraints supplied in these parameters and by
1158 * Return: 0 on success, -errno on failure
1160 int vmbus_allocate_mmio(struct resource **new, struct hv_device *device_obj,
1161 resource_size_t min, resource_size_t max,
1162 resource_size_t size, resource_size_t align,
1165 struct resource *iter, *shadow;
1166 resource_size_t range_min, range_max, start;
1167 const char *dev_n = dev_name(&device_obj->device);
1171 down(&hyperv_mmio_lock);
1174 * If overlaps with frame buffers are allowed, then first attempt to
1175 * make the allocation from within the reserved region. Because it
1176 * is already reserved, no shadow allocation is necessary.
1178 if (fb_overlap_ok && fb_mmio && !(min > fb_mmio->end) &&
1179 !(max < fb_mmio->start)) {
1181 range_min = fb_mmio->start;
1182 range_max = fb_mmio->end;
1183 start = (range_min + align - 1) & ~(align - 1);
1184 for (; start + size - 1 <= range_max; start += align) {
1185 *new = request_mem_region_exclusive(start, size, dev_n);
1193 for (iter = hyperv_mmio; iter; iter = iter->sibling) {
1194 if ((iter->start >= max) || (iter->end <= min))
1197 range_min = iter->start;
1198 range_max = iter->end;
1199 start = (range_min + align - 1) & ~(align - 1);
1200 for (; start + size - 1 <= range_max; start += align) {
1201 shadow = __request_region(iter, start, size, NULL,
1206 *new = request_mem_region_exclusive(start, size, dev_n);
1208 shadow->name = (char *)*new;
1213 __release_region(iter, start, size);
1218 up(&hyperv_mmio_lock);
1221 EXPORT_SYMBOL_GPL(vmbus_allocate_mmio);
1224 * vmbus_free_mmio() - Free a memory-mapped I/O range.
1225 * @start: Base address of region to release.
1226 * @size: Size of the range to be allocated
1228 * This function releases anything requested by
1229 * vmbus_mmio_allocate().
1231 void vmbus_free_mmio(resource_size_t start, resource_size_t size)
1233 struct resource *iter;
1235 down(&hyperv_mmio_lock);
1236 for (iter = hyperv_mmio; iter; iter = iter->sibling) {
1237 if ((iter->start >= start + size) || (iter->end <= start))
1240 __release_region(iter, start, size);
1242 release_mem_region(start, size);
1243 up(&hyperv_mmio_lock);
1246 EXPORT_SYMBOL_GPL(vmbus_free_mmio);
1249 * vmbus_cpu_number_to_vp_number() - Map CPU to VP.
1250 * @cpu_number: CPU number in Linux terms
1252 * This function returns the mapping between the Linux processor
1253 * number and the hypervisor's virtual processor number, useful
1254 * in making hypercalls and such that talk about specific
1257 * Return: Virtual processor number in Hyper-V terms
1259 int vmbus_cpu_number_to_vp_number(int cpu_number)
1261 return hv_context.vp_index[cpu_number];
1263 EXPORT_SYMBOL_GPL(vmbus_cpu_number_to_vp_number);
1265 static int vmbus_acpi_add(struct acpi_device *device)
1268 int ret_val = -ENODEV;
1269 struct acpi_device *ancestor;
1271 hv_acpi_dev = device;
1273 result = acpi_walk_resources(device->handle, METHOD_NAME__CRS,
1274 vmbus_walk_resources, NULL);
1276 if (ACPI_FAILURE(result))
1279 * Some ancestor of the vmbus acpi device (Gen1 or Gen2
1280 * firmware) is the VMOD that has the mmio ranges. Get that.
1282 for (ancestor = device->parent; ancestor; ancestor = ancestor->parent) {
1283 result = acpi_walk_resources(ancestor->handle, METHOD_NAME__CRS,
1284 vmbus_walk_resources, NULL);
1286 if (ACPI_FAILURE(result))
1296 complete(&probe_event);
1298 vmbus_acpi_remove(device);
1302 static const struct acpi_device_id vmbus_acpi_device_ids[] = {
1307 MODULE_DEVICE_TABLE(acpi, vmbus_acpi_device_ids);
1309 static struct acpi_driver vmbus_acpi_driver = {
1311 .ids = vmbus_acpi_device_ids,
1313 .add = vmbus_acpi_add,
1314 .remove = vmbus_acpi_remove,
1318 static void hv_kexec_handler(void)
1322 hv_synic_clockevents_cleanup();
1323 vmbus_initiate_unload(false);
1324 for_each_online_cpu(cpu)
1325 smp_call_function_single(cpu, hv_synic_cleanup, NULL, 1);
1329 static void hv_crash_handler(struct pt_regs *regs)
1331 vmbus_initiate_unload(true);
1333 * In crash handler we can't schedule synic cleanup for all CPUs,
1334 * doing the cleanup for current CPU only. This should be sufficient
1337 hv_synic_cleanup(NULL);
1341 static int __init hv_acpi_init(void)
1345 if (x86_hyper != &x86_hyper_ms_hyperv)
1348 init_completion(&probe_event);
1351 * Get ACPI resources first.
1353 ret = acpi_bus_register_driver(&vmbus_acpi_driver);
1358 t = wait_for_completion_timeout(&probe_event, 5*HZ);
1364 ret = vmbus_bus_init();
1368 hv_setup_kexec_handler(hv_kexec_handler);
1369 hv_setup_crash_handler(hv_crash_handler);
1374 acpi_bus_unregister_driver(&vmbus_acpi_driver);
1379 static void __exit vmbus_exit(void)
1383 hv_remove_kexec_handler();
1384 hv_remove_crash_handler();
1385 vmbus_connection.conn_state = DISCONNECTED;
1386 hv_synic_clockevents_cleanup();
1388 hv_remove_vmbus_irq();
1389 for_each_online_cpu(cpu)
1390 tasklet_kill(hv_context.msg_dpc[cpu]);
1391 vmbus_free_channels();
1392 if (ms_hyperv.misc_features & HV_FEATURE_GUEST_CRASH_MSR_AVAILABLE) {
1393 unregister_die_notifier(&hyperv_die_block);
1394 atomic_notifier_chain_unregister(&panic_notifier_list,
1395 &hyperv_panic_block);
1397 bus_unregister(&hv_bus);
1399 for_each_online_cpu(cpu) {
1400 tasklet_kill(hv_context.event_dpc[cpu]);
1401 smp_call_function_single(cpu, hv_synic_cleanup, NULL, 1);
1404 acpi_bus_unregister_driver(&vmbus_acpi_driver);
1405 if (vmbus_proto_version > VERSION_WIN7)
1406 cpu_hotplug_enable();
1410 MODULE_LICENSE("GPL");
1412 subsys_initcall(hv_acpi_init);
1413 module_exit(vmbus_exit);