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/irq.h>
29 #include <linux/interrupt.h>
30 #include <linux/sysctl.h>
31 #include <linux/pci.h>
32 #include <linux/dmi.h>
33 #include <linux/slab.h>
34 #include <linux/acpi.h>
35 #include <acpi/acpi_bus.h>
36 #include <linux/completion.h>
39 #include "hyperv_vmbus.h"
42 static struct pci_dev *hv_pci_dev;
44 static struct tasklet_struct msg_dpc;
45 static struct tasklet_struct event_dpc;
47 unsigned int vmbus_loglevel = (ALL_MODULES << 16 | INFO_LVL);
48 EXPORT_SYMBOL(vmbus_loglevel);
49 /* (ALL_MODULES << 16 | DEBUG_LVL_ENTEREXIT); */
50 /* (((VMBUS | VMBUS_DRV)<<16) | DEBUG_LVL_ENTEREXIT); */
52 static int pci_probe_error;
53 static struct completion probe_event;
56 static void get_channel_info(struct hv_device *device,
57 struct hv_device_info *info)
59 struct vmbus_channel_debug_info debug_info;
64 vmbus_get_debug_info(device->channel, &debug_info);
66 info->chn_id = debug_info.relid;
67 info->chn_state = debug_info.state;
68 memcpy(&info->chn_type, &debug_info.interfacetype,
69 sizeof(struct hv_guid));
70 memcpy(&info->chn_instance, &debug_info.interface_instance,
71 sizeof(struct hv_guid));
73 info->monitor_id = debug_info.monitorid;
75 info->server_monitor_pending = debug_info.servermonitor_pending;
76 info->server_monitor_latency = debug_info.servermonitor_latency;
77 info->server_monitor_conn_id = debug_info.servermonitor_connectionid;
79 info->client_monitor_pending = debug_info.clientmonitor_pending;
80 info->client_monitor_latency = debug_info.clientmonitor_latency;
81 info->client_monitor_conn_id = debug_info.clientmonitor_connectionid;
83 info->inbound.int_mask = debug_info.inbound.current_interrupt_mask;
84 info->inbound.read_idx = debug_info.inbound.current_read_index;
85 info->inbound.write_idx = debug_info.inbound.current_write_index;
86 info->inbound.bytes_avail_toread =
87 debug_info.inbound.bytes_avail_toread;
88 info->inbound.bytes_avail_towrite =
89 debug_info.inbound.bytes_avail_towrite;
91 info->outbound.int_mask =
92 debug_info.outbound.current_interrupt_mask;
93 info->outbound.read_idx = debug_info.outbound.current_read_index;
94 info->outbound.write_idx = debug_info.outbound.current_write_index;
95 info->outbound.bytes_avail_toread =
96 debug_info.outbound.bytes_avail_toread;
97 info->outbound.bytes_avail_towrite =
98 debug_info.outbound.bytes_avail_towrite;
102 * vmbus_show_device_attr - Show the device attribute in sysfs.
104 * This is invoked when user does a
105 * "cat /sys/bus/vmbus/devices/<busdevice>/<attr name>"
107 static ssize_t vmbus_show_device_attr(struct device *dev,
108 struct device_attribute *dev_attr,
111 struct hv_device *device_ctx = device_to_hv_device(dev);
112 struct hv_device_info device_info;
114 memset(&device_info, 0, sizeof(struct hv_device_info));
116 get_channel_info(device_ctx, &device_info);
118 if (!strcmp(dev_attr->attr.name, "class_id")) {
119 return sprintf(buf, "{%02x%02x%02x%02x-%02x%02x-%02x%02x-"
120 "%02x%02x%02x%02x%02x%02x%02x%02x}\n",
121 device_info.chn_type.data[3],
122 device_info.chn_type.data[2],
123 device_info.chn_type.data[1],
124 device_info.chn_type.data[0],
125 device_info.chn_type.data[5],
126 device_info.chn_type.data[4],
127 device_info.chn_type.data[7],
128 device_info.chn_type.data[6],
129 device_info.chn_type.data[8],
130 device_info.chn_type.data[9],
131 device_info.chn_type.data[10],
132 device_info.chn_type.data[11],
133 device_info.chn_type.data[12],
134 device_info.chn_type.data[13],
135 device_info.chn_type.data[14],
136 device_info.chn_type.data[15]);
137 } else if (!strcmp(dev_attr->attr.name, "device_id")) {
138 return sprintf(buf, "{%02x%02x%02x%02x-%02x%02x-%02x%02x-"
139 "%02x%02x%02x%02x%02x%02x%02x%02x}\n",
140 device_info.chn_instance.data[3],
141 device_info.chn_instance.data[2],
142 device_info.chn_instance.data[1],
143 device_info.chn_instance.data[0],
144 device_info.chn_instance.data[5],
145 device_info.chn_instance.data[4],
146 device_info.chn_instance.data[7],
147 device_info.chn_instance.data[6],
148 device_info.chn_instance.data[8],
149 device_info.chn_instance.data[9],
150 device_info.chn_instance.data[10],
151 device_info.chn_instance.data[11],
152 device_info.chn_instance.data[12],
153 device_info.chn_instance.data[13],
154 device_info.chn_instance.data[14],
155 device_info.chn_instance.data[15]);
156 } else if (!strcmp(dev_attr->attr.name, "state")) {
157 return sprintf(buf, "%d\n", device_info.chn_state);
158 } else if (!strcmp(dev_attr->attr.name, "id")) {
159 return sprintf(buf, "%d\n", device_info.chn_id);
160 } else if (!strcmp(dev_attr->attr.name, "out_intr_mask")) {
161 return sprintf(buf, "%d\n", device_info.outbound.int_mask);
162 } else if (!strcmp(dev_attr->attr.name, "out_read_index")) {
163 return sprintf(buf, "%d\n", device_info.outbound.read_idx);
164 } else if (!strcmp(dev_attr->attr.name, "out_write_index")) {
165 return sprintf(buf, "%d\n", device_info.outbound.write_idx);
166 } else if (!strcmp(dev_attr->attr.name, "out_read_bytes_avail")) {
167 return sprintf(buf, "%d\n",
168 device_info.outbound.bytes_avail_toread);
169 } else if (!strcmp(dev_attr->attr.name, "out_write_bytes_avail")) {
170 return sprintf(buf, "%d\n",
171 device_info.outbound.bytes_avail_towrite);
172 } else if (!strcmp(dev_attr->attr.name, "in_intr_mask")) {
173 return sprintf(buf, "%d\n", device_info.inbound.int_mask);
174 } else if (!strcmp(dev_attr->attr.name, "in_read_index")) {
175 return sprintf(buf, "%d\n", device_info.inbound.read_idx);
176 } else if (!strcmp(dev_attr->attr.name, "in_write_index")) {
177 return sprintf(buf, "%d\n", device_info.inbound.write_idx);
178 } else if (!strcmp(dev_attr->attr.name, "in_read_bytes_avail")) {
179 return sprintf(buf, "%d\n",
180 device_info.inbound.bytes_avail_toread);
181 } else if (!strcmp(dev_attr->attr.name, "in_write_bytes_avail")) {
182 return sprintf(buf, "%d\n",
183 device_info.inbound.bytes_avail_towrite);
184 } else if (!strcmp(dev_attr->attr.name, "monitor_id")) {
185 return sprintf(buf, "%d\n", device_info.monitor_id);
186 } else if (!strcmp(dev_attr->attr.name, "server_monitor_pending")) {
187 return sprintf(buf, "%d\n", device_info.server_monitor_pending);
188 } else if (!strcmp(dev_attr->attr.name, "server_monitor_latency")) {
189 return sprintf(buf, "%d\n", device_info.server_monitor_latency);
190 } else if (!strcmp(dev_attr->attr.name, "server_monitor_conn_id")) {
191 return sprintf(buf, "%d\n",
192 device_info.server_monitor_conn_id);
193 } else if (!strcmp(dev_attr->attr.name, "client_monitor_pending")) {
194 return sprintf(buf, "%d\n", device_info.client_monitor_pending);
195 } else if (!strcmp(dev_attr->attr.name, "client_monitor_latency")) {
196 return sprintf(buf, "%d\n", device_info.client_monitor_latency);
197 } else if (!strcmp(dev_attr->attr.name, "client_monitor_conn_id")) {
198 return sprintf(buf, "%d\n",
199 device_info.client_monitor_conn_id);
205 /* Set up per device attributes in /sys/bus/vmbus/devices/<bus device> */
206 static struct device_attribute vmbus_device_attrs[] = {
207 __ATTR(id, S_IRUGO, vmbus_show_device_attr, NULL),
208 __ATTR(state, S_IRUGO, vmbus_show_device_attr, NULL),
209 __ATTR(class_id, S_IRUGO, vmbus_show_device_attr, NULL),
210 __ATTR(device_id, S_IRUGO, vmbus_show_device_attr, NULL),
211 __ATTR(monitor_id, S_IRUGO, vmbus_show_device_attr, NULL),
213 __ATTR(server_monitor_pending, S_IRUGO, vmbus_show_device_attr, NULL),
214 __ATTR(server_monitor_latency, S_IRUGO, vmbus_show_device_attr, NULL),
215 __ATTR(server_monitor_conn_id, S_IRUGO, vmbus_show_device_attr, NULL),
217 __ATTR(client_monitor_pending, S_IRUGO, vmbus_show_device_attr, NULL),
218 __ATTR(client_monitor_latency, S_IRUGO, vmbus_show_device_attr, NULL),
219 __ATTR(client_monitor_conn_id, S_IRUGO, vmbus_show_device_attr, NULL),
221 __ATTR(out_intr_mask, S_IRUGO, vmbus_show_device_attr, NULL),
222 __ATTR(out_read_index, S_IRUGO, vmbus_show_device_attr, NULL),
223 __ATTR(out_write_index, S_IRUGO, vmbus_show_device_attr, NULL),
224 __ATTR(out_read_bytes_avail, S_IRUGO, vmbus_show_device_attr, NULL),
225 __ATTR(out_write_bytes_avail, S_IRUGO, vmbus_show_device_attr, NULL),
227 __ATTR(in_intr_mask, S_IRUGO, vmbus_show_device_attr, NULL),
228 __ATTR(in_read_index, S_IRUGO, vmbus_show_device_attr, NULL),
229 __ATTR(in_write_index, S_IRUGO, vmbus_show_device_attr, NULL),
230 __ATTR(in_read_bytes_avail, S_IRUGO, vmbus_show_device_attr, NULL),
231 __ATTR(in_write_bytes_avail, S_IRUGO, vmbus_show_device_attr, NULL),
237 * vmbus_uevent - add uevent for our device
239 * This routine is invoked when a device is added or removed on the vmbus to
240 * generate a uevent to udev in the userspace. The udev will then look at its
241 * rule and the uevent generated here to load the appropriate driver
243 static int vmbus_uevent(struct device *device, struct kobj_uevent_env *env)
245 struct hv_device *dev = device_to_hv_device(device);
248 ret = add_uevent_var(env, "VMBUS_DEVICE_CLASS_GUID={"
249 "%02x%02x%02x%02x-%02x%02x-%02x%02x-"
250 "%02x%02x%02x%02x%02x%02x%02x%02x}",
251 dev->dev_type.data[3],
252 dev->dev_type.data[2],
253 dev->dev_type.data[1],
254 dev->dev_type.data[0],
255 dev->dev_type.data[5],
256 dev->dev_type.data[4],
257 dev->dev_type.data[7],
258 dev->dev_type.data[6],
259 dev->dev_type.data[8],
260 dev->dev_type.data[9],
261 dev->dev_type.data[10],
262 dev->dev_type.data[11],
263 dev->dev_type.data[12],
264 dev->dev_type.data[13],
265 dev->dev_type.data[14],
266 dev->dev_type.data[15]);
271 ret = add_uevent_var(env, "VMBUS_DEVICE_DEVICE_GUID={"
272 "%02x%02x%02x%02x-%02x%02x-%02x%02x-"
273 "%02x%02x%02x%02x%02x%02x%02x%02x}",
274 dev->dev_instance.data[3],
275 dev->dev_instance.data[2],
276 dev->dev_instance.data[1],
277 dev->dev_instance.data[0],
278 dev->dev_instance.data[5],
279 dev->dev_instance.data[4],
280 dev->dev_instance.data[7],
281 dev->dev_instance.data[6],
282 dev->dev_instance.data[8],
283 dev->dev_instance.data[9],
284 dev->dev_instance.data[10],
285 dev->dev_instance.data[11],
286 dev->dev_instance.data[12],
287 dev->dev_instance.data[13],
288 dev->dev_instance.data[14],
289 dev->dev_instance.data[15]);
298 * vmbus_match - Attempt to match the specified device to the specified driver
300 static int vmbus_match(struct device *device, struct device_driver *driver)
303 struct hv_driver *drv = drv_to_hv_drv(driver);
304 struct hv_device *device_ctx = device_to_hv_device(device);
306 /* We found our driver ? */
307 if (memcmp(&device_ctx->dev_type, &drv->dev_type,
308 sizeof(struct hv_guid)) == 0)
315 * vmbus_probe - Add the new vmbus's child device
317 static int vmbus_probe(struct device *child_device)
320 struct hv_driver *drv =
321 drv_to_hv_drv(child_device->driver);
322 struct hv_device *dev = device_to_hv_device(child_device);
325 ret = drv->probe(dev);
327 pr_err("probe failed for device %s (%d)\n",
328 dev_name(child_device), ret);
331 pr_err("probe not set for driver %s\n",
332 dev_name(child_device));
339 * vmbus_remove - Remove a vmbus device
341 static int vmbus_remove(struct device *child_device)
344 struct hv_driver *drv;
346 struct hv_device *dev = device_to_hv_device(child_device);
348 if (child_device->driver) {
349 drv = drv_to_hv_drv(child_device->driver);
352 ret = drv->remove(dev);
354 pr_err("remove not set for driver %s\n",
355 dev_name(child_device));
365 * vmbus_shutdown - Shutdown a vmbus device
367 static void vmbus_shutdown(struct device *child_device)
369 struct hv_driver *drv;
370 struct hv_device *dev = device_to_hv_device(child_device);
373 /* The device may not be attached yet */
374 if (!child_device->driver)
377 drv = drv_to_hv_drv(child_device->driver);
387 * vmbus_device_release - Final callback release of the vmbus child device
389 static void vmbus_device_release(struct device *device)
391 struct hv_device *device_ctx = device_to_hv_device(device);
397 /* The one and only one */
398 static struct bus_type hv_bus = {
400 .match = vmbus_match,
401 .shutdown = vmbus_shutdown,
402 .remove = vmbus_remove,
403 .probe = vmbus_probe,
404 .uevent = vmbus_uevent,
405 .dev_attrs = vmbus_device_attrs,
408 static const char *driver_name = "hyperv";
411 struct onmessage_work_context {
412 struct work_struct work;
413 struct hv_message msg;
416 static void vmbus_onmessage_work(struct work_struct *work)
418 struct onmessage_work_context *ctx;
420 ctx = container_of(work, struct onmessage_work_context,
422 vmbus_onmessage(&ctx->msg);
427 * vmbus_on_msg_dpc - DPC routine to handle messages from the hypervisior
429 static void vmbus_on_msg_dpc(unsigned long data)
431 int cpu = smp_processor_id();
432 void *page_addr = hv_context.synic_message_page[cpu];
433 struct hv_message *msg = (struct hv_message *)page_addr +
435 struct onmessage_work_context *ctx;
438 if (msg->header.message_type == HVMSG_NONE) {
442 ctx = kmalloc(sizeof(*ctx), GFP_ATOMIC);
445 INIT_WORK(&ctx->work, vmbus_onmessage_work);
446 memcpy(&ctx->msg, msg, sizeof(*msg));
447 queue_work(vmbus_connection.work_queue, &ctx->work);
450 msg->header.message_type = HVMSG_NONE;
453 * Make sure the write to MessageType (ie set to
454 * HVMSG_NONE) happens before we read the
455 * MessagePending and EOMing. Otherwise, the EOMing
456 * will not deliver any more messages since there is
461 if (msg->header.message_flags.msg_pending) {
463 * This will cause message queue rescan to
464 * possibly deliver another msg from the
467 wrmsrl(HV_X64_MSR_EOM, 0);
473 * vmbus_on_isr - ISR routine
475 static int vmbus_on_isr(void)
478 int cpu = smp_processor_id();
480 struct hv_message *msg;
481 union hv_synic_event_flags *event;
483 page_addr = hv_context.synic_message_page[cpu];
484 msg = (struct hv_message *)page_addr + VMBUS_MESSAGE_SINT;
486 /* Check if there are actual msgs to be process */
487 if (msg->header.message_type != HVMSG_NONE)
490 /* TODO: Check if there are events to be process */
491 page_addr = hv_context.synic_event_page[cpu];
492 event = (union hv_synic_event_flags *)page_addr + VMBUS_MESSAGE_SINT;
494 /* Since we are a child, we only need to check bit 0 */
495 if (sync_test_and_clear_bit(0, (unsigned long *) &event->flags32[0]))
502 static irqreturn_t vmbus_isr(int irq, void *dev_id)
506 ret = vmbus_on_isr();
508 /* Schedules a dpc if necessary */
510 if (test_bit(0, (unsigned long *)&ret))
511 tasklet_schedule(&msg_dpc);
513 if (test_bit(1, (unsigned long *)&ret))
514 tasklet_schedule(&event_dpc);
523 * vmbus_bus_init -Main vmbus driver initialization routine.
526 * - initialize the vmbus driver context
527 * - invoke the vmbus hv main init routine
528 * - get the irq resource
529 * - retrieve the channel offers
531 static int vmbus_bus_init(struct pci_dev *pdev)
536 /* Hypervisor initialization...setup hypercall page..etc */
539 pr_err("Unable to initialize the hypervisor - 0x%x\n", ret);
543 /* Initialize the bus context */
544 tasklet_init(&msg_dpc, vmbus_on_msg_dpc, 0);
545 tasklet_init(&event_dpc, vmbus_on_event, 0);
547 /* Now, register the bus with LDM */
548 ret = bus_register(&hv_bus);
554 /* Get the interrupt resource */
555 ret = request_irq(pdev->irq, vmbus_isr,
556 IRQF_SHARED | IRQF_SAMPLE_RANDOM,
560 pr_err("Unable to request IRQ %d\n",
563 bus_unregister(&hv_bus);
569 vector = IRQ0_VECTOR + pdev->irq;
572 * Notify the hypervisor of our irq and
573 * connect to the host.
575 on_each_cpu(hv_synic_init, (void *)&vector, 1);
576 ret = vmbus_connect();
578 free_irq(pdev->irq, pdev);
579 bus_unregister(&hv_bus);
584 vmbus_request_offers();
591 * vmbus_child_driver_register() - Register a vmbus's child driver
592 * @drv: Pointer to driver structure you want to register
595 * Registers the given driver with Linux through the 'driver_register()' call
596 * And sets up the hyper-v vmbus handling for this driver.
597 * It will return the state of the 'driver_register()' call.
599 * Mainly used by Hyper-V drivers.
601 int vmbus_child_driver_register(struct device_driver *drv)
605 pr_info("child driver registering - name %s\n", drv->name);
607 /* The child driver on this vmbus */
610 ret = driver_register(drv);
612 vmbus_request_offers();
616 EXPORT_SYMBOL(vmbus_child_driver_register);
619 * vmbus_child_driver_unregister() - Unregister a vmbus's child driver
620 * @drv: Pointer to driver structure you want to un-register
623 * Un-register the given driver with Linux through the 'driver_unregister()'
624 * call. And ungegisters the driver from the Hyper-V vmbus handler.
626 * Mainly used by Hyper-V drivers.
628 void vmbus_child_driver_unregister(struct device_driver *drv)
630 pr_info("child driver unregistering - name %s\n", drv->name);
632 driver_unregister(drv);
636 EXPORT_SYMBOL(vmbus_child_driver_unregister);
639 * vmbus_child_device_create - Creates and registers a new child device
642 struct hv_device *vmbus_child_device_create(struct hv_guid *type,
643 struct hv_guid *instance,
644 struct vmbus_channel *channel)
646 struct hv_device *child_device_obj;
648 /* Allocate the new child device */
649 child_device_obj = kzalloc(sizeof(struct hv_device), GFP_KERNEL);
650 if (!child_device_obj) {
651 pr_err("Unable to allocate device object for child device\n");
655 child_device_obj->channel = channel;
656 memcpy(&child_device_obj->dev_type, type, sizeof(struct hv_guid));
657 memcpy(&child_device_obj->dev_instance, instance,
658 sizeof(struct hv_guid));
661 return child_device_obj;
665 * vmbus_child_device_register - Register the child device
667 int vmbus_child_device_register(struct hv_device *child_device_obj)
671 static atomic_t device_num = ATOMIC_INIT(0);
673 /* Set the device name. Otherwise, device_register() will fail. */
674 dev_set_name(&child_device_obj->device, "vmbus_0_%d",
675 atomic_inc_return(&device_num));
677 /* The new device belongs to this bus */
678 child_device_obj->device.bus = &hv_bus; /* device->dev.bus; */
679 child_device_obj->device.parent = &hv_pci_dev->dev;
680 child_device_obj->device.release = vmbus_device_release;
683 * Register with the LDM. This will kick off the driver/device
684 * binding...which will eventually call vmbus_match() and vmbus_probe()
686 ret = device_register(&child_device_obj->device);
689 pr_err("Unable to register child device\n");
691 pr_info("child device %s registered\n",
692 dev_name(&child_device_obj->device));
698 * vmbus_child_device_unregister - Remove the specified child device
701 void vmbus_child_device_unregister(struct hv_device *device_obj)
704 * Kick off the process of unregistering the device.
705 * This will call vmbus_remove() and eventually vmbus_device_release()
707 device_unregister(&device_obj->device);
709 pr_info("child device %s unregistered\n",
710 dev_name(&device_obj->device));
715 * VMBUS is an acpi enumerated device. Get the the IRQ information
719 static acpi_status vmbus_walk_resources(struct acpi_resource *res, void *irq)
722 if (res->type == ACPI_RESOURCE_TYPE_IRQ) {
723 struct acpi_resource_irq *irqp;
724 irqp = &res->data.irq;
726 *((unsigned int *)irq) = irqp->interrupts[0];
732 static int vmbus_acpi_add(struct acpi_device *device)
737 acpi_walk_resources(device->handle, METHOD_NAME__CRS,
738 vmbus_walk_resources, &irq);
740 if (ACPI_FAILURE(result)) {
741 complete(&probe_event);
744 complete(&probe_event);
748 static const struct acpi_device_id vmbus_acpi_device_ids[] = {
752 MODULE_DEVICE_TABLE(acpi, vmbus_acpi_device_ids);
754 static struct acpi_driver vmbus_acpi_driver = {
756 .ids = vmbus_acpi_device_ids,
758 .add = vmbus_acpi_add,
762 static int vmbus_acpi_init(void)
767 result = acpi_bus_register_driver(&vmbus_acpi_driver);
774 static void vmbus_acpi_exit(void)
776 acpi_bus_unregister_driver(&vmbus_acpi_driver);
782 static int __devinit hv_pci_probe(struct pci_dev *pdev,
783 const struct pci_device_id *ent)
787 pci_probe_error = pci_enable_device(pdev);
792 * If the PCI sub-sytem did not assign us an
793 * irq, use the bios provided one.
799 pci_probe_error = vmbus_bus_init(pdev);
802 pci_disable_device(pdev);
805 complete(&probe_event);
806 return pci_probe_error;
810 * We use a PCI table to determine if we should autoload this driver This is
811 * needed by distro tools to determine if the hyperv drivers should be
812 * installed and/or configured. We don't do anything else with the table, but
813 * it needs to be present.
815 static const struct pci_device_id microsoft_hv_pci_table[] = {
816 { PCI_DEVICE(0x1414, 0x5353) }, /* VGA compatible controller */
819 MODULE_DEVICE_TABLE(pci, microsoft_hv_pci_table);
821 static struct pci_driver hv_bus_driver = {
823 .probe = hv_pci_probe,
824 .id_table = microsoft_hv_pci_table,
827 static int __init hv_pci_init(void)
831 init_completion(&probe_event);
834 * Get irq resources first.
837 ret = vmbus_acpi_init();
841 wait_for_completion(&probe_event);
849 init_completion(&probe_event);
850 ret = pci_register_driver(&hv_bus_driver);
854 * All the vmbus initialization occurs within the
855 * hv_pci_probe() function. Wait for hv_pci_probe()
858 wait_for_completion(&probe_event);
861 pci_unregister_driver(&hv_bus_driver);
862 return pci_probe_error;
866 MODULE_LICENSE("GPL");
867 MODULE_VERSION(HV_DRV_VERSION);
868 module_param(vmbus_loglevel, int, S_IRUGO|S_IWUSR);
870 module_init(hv_pci_init);