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>
21 #include <linux/init.h>
22 #include <linux/module.h>
23 #include <linux/device.h>
24 #include <linux/irq.h>
25 #include <linux/interrupt.h>
26 #include <linux/sysctl.h>
27 #include <linux/pci.h>
28 #include <linux/dmi.h>
29 #include <linux/slab.h>
30 #include <linux/completion.h>
31 #include "version_info.h"
37 /* FIXME! We need to do this dynamically for PIC and APIC system */
39 #define VMBUS_IRQ_VECTOR IRQ5_VECTOR
41 /* Main vmbus driver data structure */
42 struct vmbus_driver_context {
43 /* !! These must be the first 2 fields !! */
44 /* FIXME, this is a bug */
45 /* The driver field is not used in here. Instead, the bus field is */
46 /* used to represent the driver */
47 struct driver_context drv_ctx;
48 struct vmbus_driver drv_obj;
51 struct tasklet_struct msg_dpc;
52 struct tasklet_struct event_dpc;
54 /* The bus root device */
55 struct vm_device device_ctx;
58 static int vmbus_match(struct device *device, struct device_driver *driver);
59 static int vmbus_probe(struct device *device);
60 static int vmbus_remove(struct device *device);
61 static void vmbus_shutdown(struct device *device);
62 static int vmbus_uevent(struct device *device, struct kobj_uevent_env *env);
63 static void vmbus_msg_dpc(unsigned long data);
64 static void vmbus_event_dpc(unsigned long data);
66 static irqreturn_t vmbus_isr(int irq, void *dev_id);
68 static void vmbus_device_release(struct device *device);
69 static void vmbus_bus_release(struct device *device);
71 static struct hv_device *vmbus_child_device_create(struct hv_guid *type,
72 struct hv_guid *instance,
74 static void vmbus_child_device_destroy(struct hv_device *device_obj);
75 static int vmbus_child_device_register(struct hv_device *root_device_obj,
76 struct hv_device *child_device_obj);
77 static void vmbus_child_device_unregister(struct hv_device *child_device_obj);
78 static void vmbus_child_device_get_info(struct hv_device *device_obj,
79 struct hv_device_info *device_info);
80 static ssize_t vmbus_show_device_attr(struct device *dev,
81 struct device_attribute *dev_attr,
85 unsigned int vmbus_loglevel = (ALL_MODULES << 16 | INFO_LVL);
86 EXPORT_SYMBOL(vmbus_loglevel);
87 /* (ALL_MODULES << 16 | DEBUG_LVL_ENTEREXIT); */
88 /* (((VMBUS | VMBUS_DRV)<<16) | DEBUG_LVL_ENTEREXIT); */
90 static int vmbus_irq = VMBUS_IRQ;
92 /* Set up per device attributes in /sys/bus/vmbus/devices/<bus device> */
93 static struct device_attribute vmbus_device_attrs[] = {
94 __ATTR(id, S_IRUGO, vmbus_show_device_attr, NULL),
95 __ATTR(state, S_IRUGO, vmbus_show_device_attr, NULL),
96 __ATTR(class_id, S_IRUGO, vmbus_show_device_attr, NULL),
97 __ATTR(device_id, S_IRUGO, vmbus_show_device_attr, NULL),
98 __ATTR(monitor_id, S_IRUGO, vmbus_show_device_attr, NULL),
100 __ATTR(server_monitor_pending, S_IRUGO, vmbus_show_device_attr, NULL),
101 __ATTR(server_monitor_latency, S_IRUGO, vmbus_show_device_attr, NULL),
102 __ATTR(server_monitor_conn_id, S_IRUGO, vmbus_show_device_attr, NULL),
104 __ATTR(client_monitor_pending, S_IRUGO, vmbus_show_device_attr, NULL),
105 __ATTR(client_monitor_latency, S_IRUGO, vmbus_show_device_attr, NULL),
106 __ATTR(client_monitor_conn_id, S_IRUGO, vmbus_show_device_attr, NULL),
108 __ATTR(out_intr_mask, S_IRUGO, vmbus_show_device_attr, NULL),
109 __ATTR(out_read_index, S_IRUGO, vmbus_show_device_attr, NULL),
110 __ATTR(out_write_index, S_IRUGO, vmbus_show_device_attr, NULL),
111 __ATTR(out_read_bytes_avail, S_IRUGO, vmbus_show_device_attr, NULL),
112 __ATTR(out_write_bytes_avail, S_IRUGO, vmbus_show_device_attr, NULL),
114 __ATTR(in_intr_mask, S_IRUGO, vmbus_show_device_attr, NULL),
115 __ATTR(in_read_index, S_IRUGO, vmbus_show_device_attr, NULL),
116 __ATTR(in_write_index, S_IRUGO, vmbus_show_device_attr, NULL),
117 __ATTR(in_read_bytes_avail, S_IRUGO, vmbus_show_device_attr, NULL),
118 __ATTR(in_write_bytes_avail, S_IRUGO, vmbus_show_device_attr, NULL),
122 /* The one and only one */
123 static struct vmbus_driver_context g_vmbus_drv = {
125 .bus.match = vmbus_match,
126 .bus.shutdown = vmbus_shutdown,
127 .bus.remove = vmbus_remove,
128 .bus.probe = vmbus_probe,
129 .bus.uevent = vmbus_uevent,
130 .bus.dev_attrs = vmbus_device_attrs,
134 * vmbus_show_device_attr - Show the device attribute in sysfs.
136 * This is invoked when user does a
137 * "cat /sys/bus/vmbus/devices/<busdevice>/<attr name>"
139 static ssize_t vmbus_show_device_attr(struct device *dev,
140 struct device_attribute *dev_attr,
143 struct vm_device *device_ctx = device_to_vm_device(dev);
144 struct hv_device_info device_info;
146 memset(&device_info, 0, sizeof(struct hv_device_info));
148 vmbus_child_device_get_info(&device_ctx->device_obj, &device_info);
150 if (!strcmp(dev_attr->attr.name, "class_id")) {
151 return sprintf(buf, "{%02x%02x%02x%02x-%02x%02x-%02x%02x-"
152 "%02x%02x%02x%02x%02x%02x%02x%02x}\n",
153 device_info.ChannelType.data[3],
154 device_info.ChannelType.data[2],
155 device_info.ChannelType.data[1],
156 device_info.ChannelType.data[0],
157 device_info.ChannelType.data[5],
158 device_info.ChannelType.data[4],
159 device_info.ChannelType.data[7],
160 device_info.ChannelType.data[6],
161 device_info.ChannelType.data[8],
162 device_info.ChannelType.data[9],
163 device_info.ChannelType.data[10],
164 device_info.ChannelType.data[11],
165 device_info.ChannelType.data[12],
166 device_info.ChannelType.data[13],
167 device_info.ChannelType.data[14],
168 device_info.ChannelType.data[15]);
169 } else if (!strcmp(dev_attr->attr.name, "device_id")) {
170 return sprintf(buf, "{%02x%02x%02x%02x-%02x%02x-%02x%02x-"
171 "%02x%02x%02x%02x%02x%02x%02x%02x}\n",
172 device_info.ChannelInstance.data[3],
173 device_info.ChannelInstance.data[2],
174 device_info.ChannelInstance.data[1],
175 device_info.ChannelInstance.data[0],
176 device_info.ChannelInstance.data[5],
177 device_info.ChannelInstance.data[4],
178 device_info.ChannelInstance.data[7],
179 device_info.ChannelInstance.data[6],
180 device_info.ChannelInstance.data[8],
181 device_info.ChannelInstance.data[9],
182 device_info.ChannelInstance.data[10],
183 device_info.ChannelInstance.data[11],
184 device_info.ChannelInstance.data[12],
185 device_info.ChannelInstance.data[13],
186 device_info.ChannelInstance.data[14],
187 device_info.ChannelInstance.data[15]);
188 } else if (!strcmp(dev_attr->attr.name, "state")) {
189 return sprintf(buf, "%d\n", device_info.ChannelState);
190 } else if (!strcmp(dev_attr->attr.name, "id")) {
191 return sprintf(buf, "%d\n", device_info.ChannelId);
192 } else if (!strcmp(dev_attr->attr.name, "out_intr_mask")) {
193 return sprintf(buf, "%d\n", device_info.Outbound.InterruptMask);
194 } else if (!strcmp(dev_attr->attr.name, "out_read_index")) {
195 return sprintf(buf, "%d\n", device_info.Outbound.ReadIndex);
196 } else if (!strcmp(dev_attr->attr.name, "out_write_index")) {
197 return sprintf(buf, "%d\n", device_info.Outbound.WriteIndex);
198 } else if (!strcmp(dev_attr->attr.name, "out_read_bytes_avail")) {
199 return sprintf(buf, "%d\n",
200 device_info.Outbound.BytesAvailToRead);
201 } else if (!strcmp(dev_attr->attr.name, "out_write_bytes_avail")) {
202 return sprintf(buf, "%d\n",
203 device_info.Outbound.BytesAvailToWrite);
204 } else if (!strcmp(dev_attr->attr.name, "in_intr_mask")) {
205 return sprintf(buf, "%d\n", device_info.Inbound.InterruptMask);
206 } else if (!strcmp(dev_attr->attr.name, "in_read_index")) {
207 return sprintf(buf, "%d\n", device_info.Inbound.ReadIndex);
208 } else if (!strcmp(dev_attr->attr.name, "in_write_index")) {
209 return sprintf(buf, "%d\n", device_info.Inbound.WriteIndex);
210 } else if (!strcmp(dev_attr->attr.name, "in_read_bytes_avail")) {
211 return sprintf(buf, "%d\n",
212 device_info.Inbound.BytesAvailToRead);
213 } else if (!strcmp(dev_attr->attr.name, "in_write_bytes_avail")) {
214 return sprintf(buf, "%d\n",
215 device_info.Inbound.BytesAvailToWrite);
216 } else if (!strcmp(dev_attr->attr.name, "monitor_id")) {
217 return sprintf(buf, "%d\n", device_info.MonitorId);
218 } else if (!strcmp(dev_attr->attr.name, "server_monitor_pending")) {
219 return sprintf(buf, "%d\n", device_info.ServerMonitorPending);
220 } else if (!strcmp(dev_attr->attr.name, "server_monitor_latency")) {
221 return sprintf(buf, "%d\n", device_info.ServerMonitorLatency);
222 } else if (!strcmp(dev_attr->attr.name, "server_monitor_conn_id")) {
223 return sprintf(buf, "%d\n",
224 device_info.ServerMonitorConnectionId);
225 } else if (!strcmp(dev_attr->attr.name, "client_monitor_pending")) {
226 return sprintf(buf, "%d\n", device_info.ClientMonitorPending);
227 } else if (!strcmp(dev_attr->attr.name, "client_monitor_latency")) {
228 return sprintf(buf, "%d\n", device_info.ClientMonitorLatency);
229 } else if (!strcmp(dev_attr->attr.name, "client_monitor_conn_id")) {
230 return sprintf(buf, "%d\n",
231 device_info.ClientMonitorConnectionId);
238 * vmbus_bus_init -Main vmbus driver initialization routine.
241 * - initialize the vmbus driver context
242 * - setup various driver entry points
243 * - invoke the vmbus hv main init routine
244 * - get the irq resource
245 * - invoke the vmbus to add the vmbus root device
246 * - setup the vmbus root device
247 * - retrieve the channel offers
249 static int vmbus_bus_init(int (*drv_init)(struct hv_driver *drv))
251 struct vmbus_driver_context *vmbus_drv_ctx = &g_vmbus_drv;
252 struct vmbus_driver *vmbus_drv_obj = &g_vmbus_drv.drv_obj;
253 struct vm_device *dev_ctx = &g_vmbus_drv.device_ctx;
258 * Set this up to allow lower layer to callback to add/remove child
261 vmbus_drv_obj->OnChildDeviceCreate = vmbus_child_device_create;
262 vmbus_drv_obj->OnChildDeviceDestroy = vmbus_child_device_destroy;
263 vmbus_drv_obj->OnChildDeviceAdd = vmbus_child_device_register;
264 vmbus_drv_obj->OnChildDeviceRemove = vmbus_child_device_unregister;
266 /* Call to bus driver to initialize */
267 ret = drv_init(&vmbus_drv_obj->Base);
269 DPRINT_ERR(VMBUS_DRV, "Unable to initialize vmbus (%d)", ret);
274 if (!vmbus_drv_obj->Base.OnDeviceAdd) {
275 DPRINT_ERR(VMBUS_DRV, "OnDeviceAdd() routine not set");
280 vmbus_drv_ctx->bus.name = vmbus_drv_obj->Base.name;
282 /* Initialize the bus context */
283 tasklet_init(&vmbus_drv_ctx->msg_dpc, vmbus_msg_dpc,
284 (unsigned long)vmbus_drv_obj);
285 tasklet_init(&vmbus_drv_ctx->event_dpc, vmbus_event_dpc,
286 (unsigned long)vmbus_drv_obj);
288 /* Now, register the bus driver with LDM */
289 ret = bus_register(&vmbus_drv_ctx->bus);
295 /* Get the interrupt resource */
296 ret = request_irq(vmbus_irq, vmbus_isr, IRQF_SAMPLE_RANDOM,
297 vmbus_drv_obj->Base.name, NULL);
300 DPRINT_ERR(VMBUS_DRV, "ERROR - Unable to request IRQ %d",
303 bus_unregister(&vmbus_drv_ctx->bus);
308 vector = VMBUS_IRQ_VECTOR;
310 DPRINT_INFO(VMBUS_DRV, "irq 0x%x vector 0x%x", vmbus_irq, vector);
312 /* Call to bus driver to add the root device */
313 memset(dev_ctx, 0, sizeof(struct vm_device));
315 ret = vmbus_drv_obj->Base.OnDeviceAdd(&dev_ctx->device_obj, &vector);
317 DPRINT_ERR(VMBUS_DRV,
318 "ERROR - Unable to add vmbus root device");
320 free_irq(vmbus_irq, NULL);
322 bus_unregister(&vmbus_drv_ctx->bus);
327 /* strcpy(dev_ctx->device.bus_id, dev_ctx->device_obj.name); */
328 dev_set_name(&dev_ctx->device, "vmbus_0_0");
329 memcpy(&dev_ctx->class_id, &dev_ctx->device_obj.deviceType,
330 sizeof(struct hv_guid));
331 memcpy(&dev_ctx->device_id, &dev_ctx->device_obj.deviceInstance,
332 sizeof(struct hv_guid));
334 /* No need to bind a driver to the root device. */
335 dev_ctx->device.parent = NULL;
336 /* NULL; vmbus_remove() does not get invoked */
337 dev_ctx->device.bus = &vmbus_drv_ctx->bus;
339 /* Setup the device dispatch table */
340 dev_ctx->device.release = vmbus_bus_release;
342 /* Setup the bus as root device */
343 ret = device_register(&dev_ctx->device);
345 DPRINT_ERR(VMBUS_DRV,
346 "ERROR - Unable to register vmbus root device");
348 free_irq(vmbus_irq, NULL);
349 bus_unregister(&vmbus_drv_ctx->bus);
356 vmbus_drv_obj->GetChannelOffers();
358 wait_for_completion(&hv_channel_ready);
365 * vmbus_bus_exit - Terminate the vmbus driver.
367 * This routine is opposite of vmbus_bus_init()
369 static void vmbus_bus_exit(void)
371 struct vmbus_driver *vmbus_drv_obj = &g_vmbus_drv.drv_obj;
372 struct vmbus_driver_context *vmbus_drv_ctx = &g_vmbus_drv;
374 struct vm_device *dev_ctx = &g_vmbus_drv.device_ctx;
376 /* Remove the root device */
377 if (vmbus_drv_obj->Base.OnDeviceRemove)
378 vmbus_drv_obj->Base.OnDeviceRemove(&dev_ctx->device_obj);
380 if (vmbus_drv_obj->Base.OnCleanup)
381 vmbus_drv_obj->Base.OnCleanup(&vmbus_drv_obj->Base);
383 /* Unregister the root bus device */
384 device_unregister(&dev_ctx->device);
386 bus_unregister(&vmbus_drv_ctx->bus);
388 free_irq(vmbus_irq, NULL);
390 tasklet_kill(&vmbus_drv_ctx->msg_dpc);
391 tasklet_kill(&vmbus_drv_ctx->event_dpc);
396 * vmbus_child_driver_register() - Register a vmbus's child driver
397 * @driver_ctx: Pointer to driver structure you want to register
399 * @driver_ctx is of type &struct driver_context
401 * Registers the given driver with Linux through the 'driver_register()' call
402 * And sets up the hyper-v vmbus handling for this driver.
403 * It will return the state of the 'driver_register()' call.
405 * Mainly used by Hyper-V drivers.
407 int vmbus_child_driver_register(struct driver_context *driver_ctx)
409 struct vmbus_driver *vmbus_drv_obj = &g_vmbus_drv.drv_obj;
412 DPRINT_INFO(VMBUS_DRV, "child driver (%p) registering - name %s",
413 driver_ctx, driver_ctx->driver.name);
415 /* The child driver on this vmbus */
416 driver_ctx->driver.bus = &g_vmbus_drv.bus;
418 ret = driver_register(&driver_ctx->driver);
420 vmbus_drv_obj->GetChannelOffers();
424 EXPORT_SYMBOL(vmbus_child_driver_register);
427 * vmbus_child_driver_unregister() - Unregister a vmbus's child driver
428 * @driver_ctx: Pointer to driver structure you want to un-register
430 * @driver_ctx is of type &struct driver_context
432 * Un-register the given driver with Linux through the 'driver_unregister()'
433 * call. And ungegisters the driver from the Hyper-V vmbus handler.
435 * Mainly used by Hyper-V drivers.
437 void vmbus_child_driver_unregister(struct driver_context *driver_ctx)
439 DPRINT_INFO(VMBUS_DRV, "child driver (%p) unregistering - name %s",
440 driver_ctx, driver_ctx->driver.name);
442 driver_unregister(&driver_ctx->driver);
444 driver_ctx->driver.bus = NULL;
446 EXPORT_SYMBOL(vmbus_child_driver_unregister);
449 * vmbus_get_interface() - Get the vmbus channel interface.
450 * @interface: Pointer to channel interface structure
452 * Get the Hyper-V channel used for the driver.
454 * @interface is of type &struct vmbus_channel_interface
455 * This is invoked by child/client driver that sits above vmbus.
457 * Mainly used by Hyper-V drivers.
459 void vmbus_get_interface(struct vmbus_channel_interface *interface)
461 struct vmbus_driver *vmbus_drv_obj = &g_vmbus_drv.drv_obj;
463 vmbus_drv_obj->GetChannelInterface(interface);
465 EXPORT_SYMBOL(vmbus_get_interface);
468 * vmbus_child_device_get_info - Get the vmbus child device info.
470 * This is invoked to display various device attributes in sysfs.
472 static void vmbus_child_device_get_info(struct hv_device *device_obj,
473 struct hv_device_info *device_info)
475 struct vmbus_driver *vmbus_drv_obj = &g_vmbus_drv.drv_obj;
477 vmbus_drv_obj->GetChannelInfo(device_obj, device_info);
481 * vmbus_child_device_create - Creates and registers a new child device
484 static struct hv_device *vmbus_child_device_create(struct hv_guid *type,
485 struct hv_guid *instance,
488 struct vm_device *child_device_ctx;
489 struct hv_device *child_device_obj;
491 /* Allocate the new child device */
492 child_device_ctx = kzalloc(sizeof(struct vm_device), GFP_KERNEL);
493 if (!child_device_ctx) {
494 DPRINT_ERR(VMBUS_DRV,
495 "unable to allocate device_context for child device");
499 DPRINT_DBG(VMBUS_DRV, "child device (%p) allocated - "
500 "type {%02x%02x%02x%02x-%02x%02x-%02x%02x-"
501 "%02x%02x%02x%02x%02x%02x%02x%02x},"
502 "id {%02x%02x%02x%02x-%02x%02x-%02x%02x-"
503 "%02x%02x%02x%02x%02x%02x%02x%02x}",
504 &child_device_ctx->device,
505 type->data[3], type->data[2], type->data[1], type->data[0],
506 type->data[5], type->data[4], type->data[7], type->data[6],
507 type->data[8], type->data[9], type->data[10], type->data[11],
508 type->data[12], type->data[13], type->data[14], type->data[15],
509 instance->data[3], instance->data[2],
510 instance->data[1], instance->data[0],
511 instance->data[5], instance->data[4],
512 instance->data[7], instance->data[6],
513 instance->data[8], instance->data[9],
514 instance->data[10], instance->data[11],
515 instance->data[12], instance->data[13],
516 instance->data[14], instance->data[15]);
518 child_device_obj = &child_device_ctx->device_obj;
519 child_device_obj->context = context;
520 memcpy(&child_device_obj->deviceType, type, sizeof(struct hv_guid));
521 memcpy(&child_device_obj->deviceInstance, instance,
522 sizeof(struct hv_guid));
524 memcpy(&child_device_ctx->class_id, type, sizeof(struct hv_guid));
525 memcpy(&child_device_ctx->device_id, instance, sizeof(struct hv_guid));
527 return child_device_obj;
531 * vmbus_child_device_register - Register the child device on the specified bus
533 static int vmbus_child_device_register(struct hv_device *root_device_obj,
534 struct hv_device *child_device_obj)
537 struct vm_device *root_device_ctx =
538 to_vm_device(root_device_obj);
539 struct vm_device *child_device_ctx =
540 to_vm_device(child_device_obj);
541 static atomic_t device_num = ATOMIC_INIT(0);
543 DPRINT_DBG(VMBUS_DRV, "child device (%p) registering",
546 /* Set the device name. Otherwise, device_register() will fail. */
547 dev_set_name(&child_device_ctx->device, "vmbus_0_%d",
548 atomic_inc_return(&device_num));
550 /* The new device belongs to this bus */
551 child_device_ctx->device.bus = &g_vmbus_drv.bus; /* device->dev.bus; */
552 child_device_ctx->device.parent = &root_device_ctx->device;
553 child_device_ctx->device.release = vmbus_device_release;
556 * Register with the LDM. This will kick off the driver/device
557 * binding...which will eventually call vmbus_match() and vmbus_probe()
559 ret = device_register(&child_device_ctx->device);
561 /* vmbus_probe() error does not get propergate to device_register(). */
562 ret = child_device_ctx->probe_error;
565 DPRINT_ERR(VMBUS_DRV, "unable to register child device (%p)",
566 &child_device_ctx->device);
568 DPRINT_INFO(VMBUS_DRV, "child device (%p) registered",
569 &child_device_ctx->device);
575 * vmbus_child_device_unregister - Remove the specified child device
578 static void vmbus_child_device_unregister(struct hv_device *device_obj)
580 struct vm_device *device_ctx = to_vm_device(device_obj);
582 DPRINT_INFO(VMBUS_DRV, "unregistering child device (%p)",
583 &device_ctx->device);
586 * Kick off the process of unregistering the device.
587 * This will call vmbus_remove() and eventually vmbus_device_release()
589 device_unregister(&device_ctx->device);
591 DPRINT_INFO(VMBUS_DRV, "child device (%p) unregistered",
592 &device_ctx->device);
596 * vmbus_child_device_destroy - Destroy the specified child device on the vmbus.
598 static void vmbus_child_device_destroy(struct hv_device *device_obj)
603 * vmbus_uevent - add uevent for our device
605 * This routine is invoked when a device is added or removed on the vmbus to
606 * generate a uevent to udev in the userspace. The udev will then look at its
607 * rule and the uevent generated here to load the appropriate driver
609 static int vmbus_uevent(struct device *device, struct kobj_uevent_env *env)
611 struct vm_device *device_ctx = device_to_vm_device(device);
614 DPRINT_INFO(VMBUS_DRV, "generating uevent - VMBUS_DEVICE_CLASS_GUID={"
615 "%02x%02x%02x%02x-%02x%02x-%02x%02x-"
616 "%02x%02x%02x%02x%02x%02x%02x%02x}",
617 device_ctx->class_id.data[3], device_ctx->class_id.data[2],
618 device_ctx->class_id.data[1], device_ctx->class_id.data[0],
619 device_ctx->class_id.data[5], device_ctx->class_id.data[4],
620 device_ctx->class_id.data[7], device_ctx->class_id.data[6],
621 device_ctx->class_id.data[8], device_ctx->class_id.data[9],
622 device_ctx->class_id.data[10],
623 device_ctx->class_id.data[11],
624 device_ctx->class_id.data[12],
625 device_ctx->class_id.data[13],
626 device_ctx->class_id.data[14],
627 device_ctx->class_id.data[15]);
629 ret = add_uevent_var(env, "VMBUS_DEVICE_CLASS_GUID={"
630 "%02x%02x%02x%02x-%02x%02x-%02x%02x-"
631 "%02x%02x%02x%02x%02x%02x%02x%02x}",
632 device_ctx->class_id.data[3],
633 device_ctx->class_id.data[2],
634 device_ctx->class_id.data[1],
635 device_ctx->class_id.data[0],
636 device_ctx->class_id.data[5],
637 device_ctx->class_id.data[4],
638 device_ctx->class_id.data[7],
639 device_ctx->class_id.data[6],
640 device_ctx->class_id.data[8],
641 device_ctx->class_id.data[9],
642 device_ctx->class_id.data[10],
643 device_ctx->class_id.data[11],
644 device_ctx->class_id.data[12],
645 device_ctx->class_id.data[13],
646 device_ctx->class_id.data[14],
647 device_ctx->class_id.data[15]);
652 ret = add_uevent_var(env, "VMBUS_DEVICE_DEVICE_GUID={"
653 "%02x%02x%02x%02x-%02x%02x-%02x%02x-"
654 "%02x%02x%02x%02x%02x%02x%02x%02x}",
655 device_ctx->device_id.data[3],
656 device_ctx->device_id.data[2],
657 device_ctx->device_id.data[1],
658 device_ctx->device_id.data[0],
659 device_ctx->device_id.data[5],
660 device_ctx->device_id.data[4],
661 device_ctx->device_id.data[7],
662 device_ctx->device_id.data[6],
663 device_ctx->device_id.data[8],
664 device_ctx->device_id.data[9],
665 device_ctx->device_id.data[10],
666 device_ctx->device_id.data[11],
667 device_ctx->device_id.data[12],
668 device_ctx->device_id.data[13],
669 device_ctx->device_id.data[14],
670 device_ctx->device_id.data[15]);
678 * vmbus_match - Attempt to match the specified device to the specified driver
680 static int vmbus_match(struct device *device, struct device_driver *driver)
683 struct driver_context *driver_ctx = driver_to_driver_context(driver);
684 struct vm_device *device_ctx = device_to_vm_device(device);
686 /* We found our driver ? */
687 if (memcmp(&device_ctx->class_id, &driver_ctx->class_id,
688 sizeof(struct hv_guid)) == 0) {
690 * !! NOTE: The driver_ctx is not a vmbus_drv_ctx. We typecast
691 * it here to access the struct hv_driver field
693 struct vmbus_driver_context *vmbus_drv_ctx =
694 (struct vmbus_driver_context *)driver_ctx;
696 device_ctx->device_obj.Driver = &vmbus_drv_ctx->drv_obj.Base;
697 DPRINT_INFO(VMBUS_DRV,
698 "device object (%p) set to driver object (%p)",
699 &device_ctx->device_obj,
700 device_ctx->device_obj.Driver);
708 * vmbus_probe_failed_cb - Callback when a driver probe failed in vmbus_probe()
710 * We need a callback because we cannot invoked device_unregister() inside
711 * vmbus_probe() since vmbus_probe() may be invoked inside device_register()
712 * i.e. we cannot call device_unregister() inside device_register()
714 static void vmbus_probe_failed_cb(struct work_struct *context)
716 struct vm_device *device_ctx = (struct vm_device *)context;
719 * Kick off the process of unregistering the device.
720 * This will call vmbus_remove() and eventually vmbus_device_release()
722 device_unregister(&device_ctx->device);
724 /* put_device(&device_ctx->device); */
728 * vmbus_probe - Add the new vmbus's child device
730 static int vmbus_probe(struct device *child_device)
733 struct driver_context *driver_ctx =
734 driver_to_driver_context(child_device->driver);
735 struct vm_device *device_ctx =
736 device_to_vm_device(child_device);
738 /* Let the specific open-source driver handles the probe if it can */
739 if (driver_ctx->probe) {
740 ret = device_ctx->probe_error = driver_ctx->probe(child_device);
742 DPRINT_ERR(VMBUS_DRV, "probe() failed for device %s "
743 "(%p) on driver %s (%d)...",
744 dev_name(child_device), child_device,
745 child_device->driver->name, ret);
747 INIT_WORK(&device_ctx->probe_failed_work_item,
748 vmbus_probe_failed_cb);
749 schedule_work(&device_ctx->probe_failed_work_item);
752 DPRINT_ERR(VMBUS_DRV, "probe() method not set for driver - %s",
753 child_device->driver->name);
760 * vmbus_remove - Remove a vmbus device
762 static int vmbus_remove(struct device *child_device)
765 struct driver_context *driver_ctx;
767 /* Special case root bus device */
768 if (child_device->parent == NULL) {
770 * No-op since it is statically defined and handle in
776 if (child_device->driver) {
777 driver_ctx = driver_to_driver_context(child_device->driver);
780 * Let the specific open-source driver handles the removal if
783 if (driver_ctx->remove) {
784 ret = driver_ctx->remove(child_device);
786 DPRINT_ERR(VMBUS_DRV,
787 "remove() method not set for driver - %s",
788 child_device->driver->name);
797 * vmbus_shutdown - Shutdown a vmbus device
799 static void vmbus_shutdown(struct device *child_device)
801 struct driver_context *driver_ctx;
803 /* Special case root bus device */
804 if (child_device->parent == NULL) {
806 * No-op since it is statically defined and handle in
812 /* The device may not be attached yet */
813 if (!child_device->driver)
816 driver_ctx = driver_to_driver_context(child_device->driver);
818 /* Let the specific open-source driver handles the removal if it can */
819 if (driver_ctx->shutdown)
820 driver_ctx->shutdown(child_device);
826 * vmbus_bus_release - Final callback release of the vmbus root device
828 static void vmbus_bus_release(struct device *device)
831 /* Empty release functions are a bug, or a major sign
832 * of a problem design, this MUST BE FIXED! */
833 dev_err(device, "%s needs to be fixed!\n", __func__);
838 * vmbus_device_release - Final callback release of the vmbus child device
840 static void vmbus_device_release(struct device *device)
842 struct vm_device *device_ctx = device_to_vm_device(device);
844 /* vmbus_child_device_destroy(&device_ctx->device_obj); */
847 /* !!DO NOT REFERENCE device_ctx anymore at this point!! */
851 * vmbus_msg_dpc - Tasklet routine to handle hypervisor messages
853 static void vmbus_msg_dpc(unsigned long data)
855 struct vmbus_driver *vmbus_drv_obj = (struct vmbus_driver *)data;
857 /* ASSERT(vmbus_drv_obj->OnMsgDpc != NULL); */
859 /* Call to bus driver to handle interrupt */
860 vmbus_drv_obj->OnMsgDpc(&vmbus_drv_obj->Base);
864 * vmbus_msg_dpc - Tasklet routine to handle hypervisor events
866 static void vmbus_event_dpc(unsigned long data)
868 struct vmbus_driver *vmbus_drv_obj = (struct vmbus_driver *)data;
870 /* ASSERT(vmbus_drv_obj->OnEventDpc != NULL); */
872 /* Call to bus driver to handle interrupt */
873 vmbus_drv_obj->OnEventDpc(&vmbus_drv_obj->Base);
876 static irqreturn_t vmbus_isr(int irq, void *dev_id)
878 struct vmbus_driver *vmbus_driver_obj = &g_vmbus_drv.drv_obj;
881 /* ASSERT(vmbus_driver_obj->OnIsr != NULL); */
883 /* Call to bus driver to handle interrupt */
884 ret = vmbus_driver_obj->OnIsr(&vmbus_driver_obj->Base);
886 /* Schedules a dpc if necessary */
888 if (test_bit(0, (unsigned long *)&ret))
889 tasklet_schedule(&g_vmbus_drv.msg_dpc);
891 if (test_bit(1, (unsigned long *)&ret))
892 tasklet_schedule(&g_vmbus_drv.event_dpc);
900 static struct dmi_system_id __initdata microsoft_hv_dmi_table[] = {
904 DMI_MATCH(DMI_SYS_VENDOR, "Microsoft Corporation"),
905 DMI_MATCH(DMI_PRODUCT_NAME, "Virtual Machine"),
906 DMI_MATCH(DMI_BOARD_NAME, "Virtual Machine"),
911 MODULE_DEVICE_TABLE(dmi, microsoft_hv_dmi_table);
913 static int __init vmbus_init(void)
915 DPRINT_INFO(VMBUS_DRV,
916 "Vmbus initializing.... current log level 0x%x (%x,%x)",
917 vmbus_loglevel, HIWORD(vmbus_loglevel), LOWORD(vmbus_loglevel));
918 /* Todo: it is used for loglevel, to be ported to new kernel. */
920 if (!dmi_check_system(microsoft_hv_dmi_table))
923 return vmbus_bus_init(VmbusInitialize);
926 static void __exit vmbus_exit(void)
929 /* Todo: it is used for loglevel, to be ported to new kernel. */
933 * We use a PCI table to determine if we should autoload this driver This is
934 * needed by distro tools to determine if the hyperv drivers should be
935 * installed and/or configured. We don't do anything else with the table, but
936 * it needs to be present.
938 static const struct pci_device_id microsoft_hv_pci_table[] = {
939 { PCI_DEVICE(0x1414, 0x5353) }, /* VGA compatible controller */
942 MODULE_DEVICE_TABLE(pci, microsoft_hv_pci_table);
944 MODULE_LICENSE("GPL");
945 MODULE_VERSION(HV_DRV_VERSION);
946 module_param(vmbus_irq, int, S_IRUGO);
947 module_param(vmbus_loglevel, int, S_IRUGO);
949 module_init(vmbus_init);
950 module_exit(vmbus_exit);