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>
32 /* FIXME! We need to do this dynamically for PIC and APIC system */
34 #define VMBUS_IRQ_VECTOR IRQ5_VECTOR
36 /* Main vmbus driver data structure */
37 struct vmbus_driver_context {
38 /* !! These must be the first 2 fields !! */
39 /* FIXME, this is a bug */
40 /* The driver field is not used in here. Instead, the bus field is */
41 /* used to represent the driver */
42 struct driver_context drv_ctx;
43 struct vmbus_driver drv_obj;
46 struct tasklet_struct msg_dpc;
47 struct tasklet_struct event_dpc;
49 /* The bus root device */
50 struct device_context device_ctx;
53 static int vmbus_match(struct device *device, struct device_driver *driver);
54 static int vmbus_probe(struct device *device);
55 static int vmbus_remove(struct device *device);
56 static void vmbus_shutdown(struct device *device);
57 static int vmbus_uevent(struct device *device, struct kobj_uevent_env *env);
58 static void vmbus_msg_dpc(unsigned long data);
59 static void vmbus_event_dpc(unsigned long data);
61 static irqreturn_t vmbus_isr(int irq, void *dev_id);
63 static void vmbus_device_release(struct device *device);
64 static void vmbus_bus_release(struct device *device);
66 static struct hv_device *vmbus_child_device_create(struct hv_guid *type,
67 struct hv_guid *instance,
69 static void vmbus_child_device_destroy(struct hv_device *device_obj);
70 static int vmbus_child_device_register(struct hv_device *root_device_obj,
71 struct hv_device *child_device_obj);
72 static void vmbus_child_device_unregister(struct hv_device *child_device_obj);
73 static void vmbus_child_device_get_info(struct hv_device *device_obj,
74 struct hv_device_info *device_info);
75 static ssize_t vmbus_show_device_attr(struct device *dev,
76 struct device_attribute *dev_attr,
80 unsigned int vmbus_loglevel = (ALL_MODULES << 16 | INFO_LVL);
81 EXPORT_SYMBOL(vmbus_loglevel);
82 /* (ALL_MODULES << 16 | DEBUG_LVL_ENTEREXIT); */
83 /* (((VMBUS | VMBUS_DRV)<<16) | DEBUG_LVL_ENTEREXIT); */
85 static int vmbus_irq = VMBUS_IRQ;
87 /* Set up per device attributes in /sys/bus/vmbus/devices/<bus device> */
88 static struct device_attribute vmbus_device_attrs[] = {
89 __ATTR(id, S_IRUGO, vmbus_show_device_attr, NULL),
90 __ATTR(state, S_IRUGO, vmbus_show_device_attr, NULL),
91 __ATTR(class_id, S_IRUGO, vmbus_show_device_attr, NULL),
92 __ATTR(device_id, S_IRUGO, vmbus_show_device_attr, NULL),
93 __ATTR(monitor_id, S_IRUGO, vmbus_show_device_attr, NULL),
95 __ATTR(server_monitor_pending, S_IRUGO, vmbus_show_device_attr, NULL),
96 __ATTR(server_monitor_latency, S_IRUGO, vmbus_show_device_attr, NULL),
97 __ATTR(server_monitor_conn_id, S_IRUGO, vmbus_show_device_attr, NULL),
99 __ATTR(client_monitor_pending, S_IRUGO, vmbus_show_device_attr, NULL),
100 __ATTR(client_monitor_latency, S_IRUGO, vmbus_show_device_attr, NULL),
101 __ATTR(client_monitor_conn_id, S_IRUGO, vmbus_show_device_attr, NULL),
103 __ATTR(out_intr_mask, S_IRUGO, vmbus_show_device_attr, NULL),
104 __ATTR(out_read_index, S_IRUGO, vmbus_show_device_attr, NULL),
105 __ATTR(out_write_index, S_IRUGO, vmbus_show_device_attr, NULL),
106 __ATTR(out_read_bytes_avail, S_IRUGO, vmbus_show_device_attr, NULL),
107 __ATTR(out_write_bytes_avail, S_IRUGO, vmbus_show_device_attr, NULL),
109 __ATTR(in_intr_mask, S_IRUGO, vmbus_show_device_attr, NULL),
110 __ATTR(in_read_index, S_IRUGO, vmbus_show_device_attr, NULL),
111 __ATTR(in_write_index, S_IRUGO, vmbus_show_device_attr, NULL),
112 __ATTR(in_read_bytes_avail, S_IRUGO, vmbus_show_device_attr, NULL),
113 __ATTR(in_write_bytes_avail, S_IRUGO, vmbus_show_device_attr, NULL),
117 /* The one and only one */
118 static struct vmbus_driver_context g_vmbus_drv = {
120 .bus.match = vmbus_match,
121 .bus.shutdown = vmbus_shutdown,
122 .bus.remove = vmbus_remove,
123 .bus.probe = vmbus_probe,
124 .bus.uevent = vmbus_uevent,
125 .bus.dev_attrs = vmbus_device_attrs,
129 * vmbus_show_device_attr - Show the device attribute in sysfs.
131 * This is invoked when user does a
132 * "cat /sys/bus/vmbus/devices/<busdevice>/<attr name>"
134 static ssize_t vmbus_show_device_attr(struct device *dev,
135 struct device_attribute *dev_attr,
138 struct device_context *device_ctx = device_to_device_context(dev);
139 struct hv_device_info device_info;
141 memset(&device_info, 0, sizeof(struct hv_device_info));
143 vmbus_child_device_get_info(&device_ctx->device_obj, &device_info);
145 if (!strcmp(dev_attr->attr.name, "class_id")) {
146 return sprintf(buf, "{%02x%02x%02x%02x-%02x%02x-%02x%02x-"
147 "%02x%02x%02x%02x%02x%02x%02x%02x}\n",
148 device_info.ChannelType.data[3],
149 device_info.ChannelType.data[2],
150 device_info.ChannelType.data[1],
151 device_info.ChannelType.data[0],
152 device_info.ChannelType.data[5],
153 device_info.ChannelType.data[4],
154 device_info.ChannelType.data[7],
155 device_info.ChannelType.data[6],
156 device_info.ChannelType.data[8],
157 device_info.ChannelType.data[9],
158 device_info.ChannelType.data[10],
159 device_info.ChannelType.data[11],
160 device_info.ChannelType.data[12],
161 device_info.ChannelType.data[13],
162 device_info.ChannelType.data[14],
163 device_info.ChannelType.data[15]);
164 } else if (!strcmp(dev_attr->attr.name, "device_id")) {
165 return sprintf(buf, "{%02x%02x%02x%02x-%02x%02x-%02x%02x-"
166 "%02x%02x%02x%02x%02x%02x%02x%02x}\n",
167 device_info.ChannelInstance.data[3],
168 device_info.ChannelInstance.data[2],
169 device_info.ChannelInstance.data[1],
170 device_info.ChannelInstance.data[0],
171 device_info.ChannelInstance.data[5],
172 device_info.ChannelInstance.data[4],
173 device_info.ChannelInstance.data[7],
174 device_info.ChannelInstance.data[6],
175 device_info.ChannelInstance.data[8],
176 device_info.ChannelInstance.data[9],
177 device_info.ChannelInstance.data[10],
178 device_info.ChannelInstance.data[11],
179 device_info.ChannelInstance.data[12],
180 device_info.ChannelInstance.data[13],
181 device_info.ChannelInstance.data[14],
182 device_info.ChannelInstance.data[15]);
183 } else if (!strcmp(dev_attr->attr.name, "state")) {
184 return sprintf(buf, "%d\n", device_info.ChannelState);
185 } else if (!strcmp(dev_attr->attr.name, "id")) {
186 return sprintf(buf, "%d\n", device_info.ChannelId);
187 } else if (!strcmp(dev_attr->attr.name, "out_intr_mask")) {
188 return sprintf(buf, "%d\n", device_info.Outbound.InterruptMask);
189 } else if (!strcmp(dev_attr->attr.name, "out_read_index")) {
190 return sprintf(buf, "%d\n", device_info.Outbound.ReadIndex);
191 } else if (!strcmp(dev_attr->attr.name, "out_write_index")) {
192 return sprintf(buf, "%d\n", device_info.Outbound.WriteIndex);
193 } else if (!strcmp(dev_attr->attr.name, "out_read_bytes_avail")) {
194 return sprintf(buf, "%d\n",
195 device_info.Outbound.BytesAvailToRead);
196 } else if (!strcmp(dev_attr->attr.name, "out_write_bytes_avail")) {
197 return sprintf(buf, "%d\n",
198 device_info.Outbound.BytesAvailToWrite);
199 } else if (!strcmp(dev_attr->attr.name, "in_intr_mask")) {
200 return sprintf(buf, "%d\n", device_info.Inbound.InterruptMask);
201 } else if (!strcmp(dev_attr->attr.name, "in_read_index")) {
202 return sprintf(buf, "%d\n", device_info.Inbound.ReadIndex);
203 } else if (!strcmp(dev_attr->attr.name, "in_write_index")) {
204 return sprintf(buf, "%d\n", device_info.Inbound.WriteIndex);
205 } else if (!strcmp(dev_attr->attr.name, "in_read_bytes_avail")) {
206 return sprintf(buf, "%d\n",
207 device_info.Inbound.BytesAvailToRead);
208 } else if (!strcmp(dev_attr->attr.name, "in_write_bytes_avail")) {
209 return sprintf(buf, "%d\n",
210 device_info.Inbound.BytesAvailToWrite);
211 } else if (!strcmp(dev_attr->attr.name, "monitor_id")) {
212 return sprintf(buf, "%d\n", device_info.MonitorId);
213 } else if (!strcmp(dev_attr->attr.name, "server_monitor_pending")) {
214 return sprintf(buf, "%d\n", device_info.ServerMonitorPending);
215 } else if (!strcmp(dev_attr->attr.name, "server_monitor_latency")) {
216 return sprintf(buf, "%d\n", device_info.ServerMonitorLatency);
217 } else if (!strcmp(dev_attr->attr.name, "server_monitor_conn_id")) {
218 return sprintf(buf, "%d\n",
219 device_info.ServerMonitorConnectionId);
220 } else if (!strcmp(dev_attr->attr.name, "client_monitor_pending")) {
221 return sprintf(buf, "%d\n", device_info.ClientMonitorPending);
222 } else if (!strcmp(dev_attr->attr.name, "client_monitor_latency")) {
223 return sprintf(buf, "%d\n", device_info.ClientMonitorLatency);
224 } else if (!strcmp(dev_attr->attr.name, "client_monitor_conn_id")) {
225 return sprintf(buf, "%d\n",
226 device_info.ClientMonitorConnectionId);
233 * vmbus_bus_init -Main vmbus driver initialization routine.
236 * - initialize the vmbus driver context
237 * - setup various driver entry points
238 * - invoke the vmbus hv main init routine
239 * - get the irq resource
240 * - invoke the vmbus to add the vmbus root device
241 * - setup the vmbus root device
242 * - retrieve the channel offers
244 static int vmbus_bus_init(int (*drv_init)(struct hv_driver *drv))
246 struct vmbus_driver_context *vmbus_drv_ctx = &g_vmbus_drv;
247 struct vmbus_driver *vmbus_drv_obj = &g_vmbus_drv.drv_obj;
248 struct device_context *dev_ctx = &g_vmbus_drv.device_ctx;
252 DPRINT_ENTER(VMBUS_DRV);
255 * Set this up to allow lower layer to callback to add/remove child
258 vmbus_drv_obj->OnChildDeviceCreate = vmbus_child_device_create;
259 vmbus_drv_obj->OnChildDeviceDestroy = vmbus_child_device_destroy;
260 vmbus_drv_obj->OnChildDeviceAdd = vmbus_child_device_register;
261 vmbus_drv_obj->OnChildDeviceRemove = vmbus_child_device_unregister;
263 /* Call to bus driver to initialize */
264 ret = drv_init(&vmbus_drv_obj->Base);
266 DPRINT_ERR(VMBUS_DRV, "Unable to initialize vmbus (%d)", ret);
271 if (!vmbus_drv_obj->Base.OnDeviceAdd) {
272 DPRINT_ERR(VMBUS_DRV, "OnDeviceAdd() routine not set");
277 vmbus_drv_ctx->bus.name = vmbus_drv_obj->Base.name;
279 /* Initialize the bus context */
280 tasklet_init(&vmbus_drv_ctx->msg_dpc, vmbus_msg_dpc,
281 (unsigned long)vmbus_drv_obj);
282 tasklet_init(&vmbus_drv_ctx->event_dpc, vmbus_event_dpc,
283 (unsigned long)vmbus_drv_obj);
285 /* Now, register the bus driver with LDM */
286 ret = bus_register(&vmbus_drv_ctx->bus);
292 /* Get the interrupt resource */
293 ret = request_irq(vmbus_irq, vmbus_isr, IRQF_SAMPLE_RANDOM,
294 vmbus_drv_obj->Base.name, NULL);
297 DPRINT_ERR(VMBUS_DRV, "ERROR - Unable to request IRQ %d",
300 bus_unregister(&vmbus_drv_ctx->bus);
305 vector = VMBUS_IRQ_VECTOR;
307 DPRINT_INFO(VMBUS_DRV, "irq 0x%x vector 0x%x", vmbus_irq, vector);
309 /* Call to bus driver to add the root device */
310 memset(dev_ctx, 0, sizeof(struct device_context));
312 ret = vmbus_drv_obj->Base.OnDeviceAdd(&dev_ctx->device_obj, &vector);
314 DPRINT_ERR(VMBUS_DRV,
315 "ERROR - Unable to add vmbus root device");
317 free_irq(vmbus_irq, NULL);
319 bus_unregister(&vmbus_drv_ctx->bus);
324 /* strcpy(dev_ctx->device.bus_id, dev_ctx->device_obj.name); */
325 dev_set_name(&dev_ctx->device, "vmbus_0_0");
326 memcpy(&dev_ctx->class_id, &dev_ctx->device_obj.deviceType,
327 sizeof(struct hv_guid));
328 memcpy(&dev_ctx->device_id, &dev_ctx->device_obj.deviceInstance,
329 sizeof(struct hv_guid));
331 /* No need to bind a driver to the root device. */
332 dev_ctx->device.parent = NULL;
333 /* NULL; vmbus_remove() does not get invoked */
334 dev_ctx->device.bus = &vmbus_drv_ctx->bus;
336 /* Setup the device dispatch table */
337 dev_ctx->device.release = vmbus_bus_release;
339 /* Setup the bus as root device */
340 ret = device_register(&dev_ctx->device);
342 DPRINT_ERR(VMBUS_DRV,
343 "ERROR - Unable to register vmbus root device");
345 free_irq(vmbus_irq, NULL);
346 bus_unregister(&vmbus_drv_ctx->bus);
353 vmbus_drv_obj->GetChannelOffers();
356 DPRINT_EXIT(VMBUS_DRV);
362 * vmbus_bus_exit - Terminate the vmbus driver.
364 * This routine is opposite of vmbus_bus_init()
366 static void vmbus_bus_exit(void)
368 struct vmbus_driver *vmbus_drv_obj = &g_vmbus_drv.drv_obj;
369 struct vmbus_driver_context *vmbus_drv_ctx = &g_vmbus_drv;
371 struct device_context *dev_ctx = &g_vmbus_drv.device_ctx;
373 DPRINT_ENTER(VMBUS_DRV);
375 /* Remove the root device */
376 if (vmbus_drv_obj->Base.OnDeviceRemove)
377 vmbus_drv_obj->Base.OnDeviceRemove(&dev_ctx->device_obj);
379 if (vmbus_drv_obj->Base.OnCleanup)
380 vmbus_drv_obj->Base.OnCleanup(&vmbus_drv_obj->Base);
382 /* Unregister the root bus device */
383 device_unregister(&dev_ctx->device);
385 bus_unregister(&vmbus_drv_ctx->bus);
387 free_irq(vmbus_irq, NULL);
389 tasklet_kill(&vmbus_drv_ctx->msg_dpc);
390 tasklet_kill(&vmbus_drv_ctx->event_dpc);
392 DPRINT_EXIT(VMBUS_DRV);
398 * vmbus_child_driver_register - Register a vmbus's child driver
400 int vmbus_child_driver_register(struct driver_context *driver_ctx)
402 struct vmbus_driver *vmbus_drv_obj = &g_vmbus_drv.drv_obj;
405 DPRINT_ENTER(VMBUS_DRV);
407 DPRINT_INFO(VMBUS_DRV, "child driver (%p) registering - name %s",
408 driver_ctx, driver_ctx->driver.name);
410 /* The child driver on this vmbus */
411 driver_ctx->driver.bus = &g_vmbus_drv.bus;
413 ret = driver_register(&driver_ctx->driver);
415 vmbus_drv_obj->GetChannelOffers();
417 DPRINT_EXIT(VMBUS_DRV);
421 EXPORT_SYMBOL(vmbus_child_driver_register);
424 * vmbus_child_driver_unregister Unregister a vmbus's child driver
426 void vmbus_child_driver_unregister(struct driver_context *driver_ctx)
428 DPRINT_ENTER(VMBUS_DRV);
430 DPRINT_INFO(VMBUS_DRV, "child driver (%p) unregistering - name %s",
431 driver_ctx, driver_ctx->driver.name);
433 driver_unregister(&driver_ctx->driver);
435 driver_ctx->driver.bus = NULL;
437 DPRINT_EXIT(VMBUS_DRV);
439 EXPORT_SYMBOL(vmbus_child_driver_unregister);
442 * vmbus_get_interface - Get the vmbus channel interface.
444 * This is invoked by child/client driver that sits above vmbus
446 void vmbus_get_interface(struct vmbus_channel_interface *interface)
448 struct vmbus_driver *vmbus_drv_obj = &g_vmbus_drv.drv_obj;
450 vmbus_drv_obj->GetChannelInterface(interface);
452 EXPORT_SYMBOL(vmbus_get_interface);
455 * vmbus_child_device_get_info - Get the vmbus child device info.
457 * This is invoked to display various device attributes in sysfs.
459 static void vmbus_child_device_get_info(struct hv_device *device_obj,
460 struct hv_device_info *device_info)
462 struct vmbus_driver *vmbus_drv_obj = &g_vmbus_drv.drv_obj;
464 vmbus_drv_obj->GetChannelInfo(device_obj, device_info);
468 * vmbus_child_device_create - Creates and registers a new child device on the vmbus.
470 static struct hv_device *vmbus_child_device_create(struct hv_guid *type,
471 struct hv_guid *instance,
474 struct device_context *child_device_ctx;
475 struct hv_device *child_device_obj;
477 DPRINT_ENTER(VMBUS_DRV);
479 /* Allocate the new child device */
480 child_device_ctx = kzalloc(sizeof(struct device_context), GFP_KERNEL);
481 if (!child_device_ctx) {
482 DPRINT_ERR(VMBUS_DRV,
483 "unable to allocate device_context for child device");
484 DPRINT_EXIT(VMBUS_DRV);
489 DPRINT_DBG(VMBUS_DRV, "child device (%p) allocated - "
490 "type {%02x%02x%02x%02x-%02x%02x-%02x%02x-"
491 "%02x%02x%02x%02x%02x%02x%02x%02x},"
492 "id {%02x%02x%02x%02x-%02x%02x-%02x%02x-"
493 "%02x%02x%02x%02x%02x%02x%02x%02x}",
494 &child_device_ctx->device,
495 type->data[3], type->data[2], type->data[1], type->data[0],
496 type->data[5], type->data[4], type->data[7], type->data[6],
497 type->data[8], type->data[9], type->data[10], type->data[11],
498 type->data[12], type->data[13], type->data[14], type->data[15],
499 instance->data[3], instance->data[2],
500 instance->data[1], instance->data[0],
501 instance->data[5], instance->data[4],
502 instance->data[7], instance->data[6],
503 instance->data[8], instance->data[9],
504 instance->data[10], instance->data[11],
505 instance->data[12], instance->data[13],
506 instance->data[14], instance->data[15]);
508 child_device_obj = &child_device_ctx->device_obj;
509 child_device_obj->context = context;
510 memcpy(&child_device_obj->deviceType, &type, sizeof(struct hv_guid));
511 memcpy(&child_device_obj->deviceInstance, &instance,
512 sizeof(struct hv_guid));
514 memcpy(&child_device_ctx->class_id, &type, sizeof(struct hv_guid));
515 memcpy(&child_device_ctx->device_id, &instance, sizeof(struct hv_guid));
517 DPRINT_EXIT(VMBUS_DRV);
519 return child_device_obj;
523 * vmbus_child_device_register - Register the child device on the specified bus
525 static int vmbus_child_device_register(struct hv_device *root_device_obj,
526 struct hv_device *child_device_obj)
529 struct device_context *root_device_ctx =
530 to_device_context(root_device_obj);
531 struct device_context *child_device_ctx =
532 to_device_context(child_device_obj);
533 static atomic_t device_num = ATOMIC_INIT(0);
535 DPRINT_ENTER(VMBUS_DRV);
537 DPRINT_DBG(VMBUS_DRV, "child device (%p) registering",
540 /* Set the device name. Otherwise, device_register() will fail. */
541 dev_set_name(&child_device_ctx->device, "vmbus_0_%d",
542 atomic_inc_return(&device_num));
544 /* The new device belongs to this bus */
545 child_device_ctx->device.bus = &g_vmbus_drv.bus; /* device->dev.bus; */
546 child_device_ctx->device.parent = &root_device_ctx->device;
547 child_device_ctx->device.release = vmbus_device_release;
550 * Register with the LDM. This will kick off the driver/device
551 * binding...which will eventually call vmbus_match() and vmbus_probe()
553 ret = device_register(&child_device_ctx->device);
555 /* vmbus_probe() error does not get propergate to device_register(). */
556 ret = child_device_ctx->probe_error;
559 DPRINT_ERR(VMBUS_DRV, "unable to register child device (%p)",
560 &child_device_ctx->device);
562 DPRINT_INFO(VMBUS_DRV, "child device (%p) registered",
563 &child_device_ctx->device);
565 DPRINT_EXIT(VMBUS_DRV);
571 * vmbus_child_device_unregister - Remove the specified child device from the vmbus.
573 static void vmbus_child_device_unregister(struct hv_device *device_obj)
575 struct device_context *device_ctx = to_device_context(device_obj);
577 DPRINT_ENTER(VMBUS_DRV);
579 DPRINT_INFO(VMBUS_DRV, "unregistering child device (%p)",
580 &device_ctx->device);
583 * Kick off the process of unregistering the device.
584 * This will call vmbus_remove() and eventually vmbus_device_release()
586 device_unregister(&device_ctx->device);
588 DPRINT_INFO(VMBUS_DRV, "child device (%p) unregistered",
589 &device_ctx->device);
591 DPRINT_EXIT(VMBUS_DRV);
595 * vmbus_child_device_destroy - Destroy the specified child device on the vmbus.
597 static void vmbus_child_device_destroy(struct hv_device *device_obj)
599 DPRINT_ENTER(VMBUS_DRV);
601 DPRINT_EXIT(VMBUS_DRV);
605 * vmbus_uevent - add uevent for our device
607 * This routine is invoked when a device is added or removed on the vmbus to
608 * generate a uevent to udev in the userspace. The udev will then look at its
609 * rule and the uevent generated here to load the appropriate driver
611 static int vmbus_uevent(struct device *device, struct kobj_uevent_env *env)
613 struct device_context *device_ctx = device_to_device_context(device);
618 DPRINT_ENTER(VMBUS_DRV);
620 DPRINT_INFO(VMBUS_DRV, "generating uevent - VMBUS_DEVICE_CLASS_GUID={"
621 "%02x%02x%02x%02x-%02x%02x-%02x%02x-"
622 "%02x%02x%02x%02x%02x%02x%02x%02x}",
623 device_ctx->class_id.data[3], device_ctx->class_id.data[2],
624 device_ctx->class_id.data[1], device_ctx->class_id.data[0],
625 device_ctx->class_id.data[5], device_ctx->class_id.data[4],
626 device_ctx->class_id.data[7], device_ctx->class_id.data[6],
627 device_ctx->class_id.data[8], device_ctx->class_id.data[9],
628 device_ctx->class_id.data[10],
629 device_ctx->class_id.data[11],
630 device_ctx->class_id.data[12],
631 device_ctx->class_id.data[13],
632 device_ctx->class_id.data[14],
633 device_ctx->class_id.data[15]);
637 ret = add_uevent_var(env, "VMBUS_DEVICE_CLASS_GUID={"
638 "%02x%02x%02x%02x-%02x%02x-%02x%02x-"
639 "%02x%02x%02x%02x%02x%02x%02x%02x}",
640 device_ctx->class_id.data[3],
641 device_ctx->class_id.data[2],
642 device_ctx->class_id.data[1],
643 device_ctx->class_id.data[0],
644 device_ctx->class_id.data[5],
645 device_ctx->class_id.data[4],
646 device_ctx->class_id.data[7],
647 device_ctx->class_id.data[6],
648 device_ctx->class_id.data[8],
649 device_ctx->class_id.data[9],
650 device_ctx->class_id.data[10],
651 device_ctx->class_id.data[11],
652 device_ctx->class_id.data[12],
653 device_ctx->class_id.data[13],
654 device_ctx->class_id.data[14],
655 device_ctx->class_id.data[15]);
660 ret = add_uevent_var(env, "VMBUS_DEVICE_DEVICE_GUID={"
661 "%02x%02x%02x%02x-%02x%02x-%02x%02x-"
662 "%02x%02x%02x%02x%02x%02x%02x%02x}",
663 device_ctx->device_id.data[3],
664 device_ctx->device_id.data[2],
665 device_ctx->device_id.data[1],
666 device_ctx->device_id.data[0],
667 device_ctx->device_id.data[5],
668 device_ctx->device_id.data[4],
669 device_ctx->device_id.data[7],
670 device_ctx->device_id.data[6],
671 device_ctx->device_id.data[8],
672 device_ctx->device_id.data[9],
673 device_ctx->device_id.data[10],
674 device_ctx->device_id.data[11],
675 device_ctx->device_id.data[12],
676 device_ctx->device_id.data[13],
677 device_ctx->device_id.data[14],
678 device_ctx->device_id.data[15]);
682 env->envp[env->envp_idx] = NULL;
684 DPRINT_EXIT(VMBUS_DRV);
690 * vmbus_match - Attempt to match the specified device to the specified driver
692 static int vmbus_match(struct device *device, struct device_driver *driver)
695 struct driver_context *driver_ctx = driver_to_driver_context(driver);
696 struct device_context *device_ctx = device_to_device_context(device);
698 DPRINT_ENTER(VMBUS_DRV);
700 /* We found our driver ? */
701 if (memcmp(&device_ctx->class_id, &driver_ctx->class_id,
702 sizeof(struct hv_guid)) == 0) {
704 * !! NOTE: The driver_ctx is not a vmbus_drv_ctx. We typecast
705 * it here to access the struct hv_driver field
707 struct vmbus_driver_context *vmbus_drv_ctx =
708 (struct vmbus_driver_context *)driver_ctx;
710 device_ctx->device_obj.Driver = &vmbus_drv_ctx->drv_obj.Base;
711 DPRINT_INFO(VMBUS_DRV,
712 "device object (%p) set to driver object (%p)",
713 &device_ctx->device_obj,
714 device_ctx->device_obj.Driver);
719 DPRINT_EXIT(VMBUS_DRV);
725 * vmbus_probe_failed_cb - Callback when a driver probe failed in vmbus_probe()
727 * We need a callback because we cannot invoked device_unregister() inside
728 * vmbus_probe() since vmbus_probe() may be invoked inside device_register()
729 * i.e. we cannot call device_unregister() inside device_register()
731 static void vmbus_probe_failed_cb(struct work_struct *context)
733 struct device_context *device_ctx = (struct device_context *)context;
735 DPRINT_ENTER(VMBUS_DRV);
738 * Kick off the process of unregistering the device.
739 * This will call vmbus_remove() and eventually vmbus_device_release()
741 device_unregister(&device_ctx->device);
743 /* put_device(&device_ctx->device); */
744 DPRINT_EXIT(VMBUS_DRV);
748 * vmbus_probe - Add the new vmbus's child device
750 static int vmbus_probe(struct device *child_device)
753 struct driver_context *driver_ctx =
754 driver_to_driver_context(child_device->driver);
755 struct device_context *device_ctx =
756 device_to_device_context(child_device);
758 DPRINT_ENTER(VMBUS_DRV);
760 /* Let the specific open-source driver handles the probe if it can */
761 if (driver_ctx->probe) {
762 ret = device_ctx->probe_error = driver_ctx->probe(child_device);
764 DPRINT_ERR(VMBUS_DRV, "probe() failed for device %s "
765 "(%p) on driver %s (%d)...",
766 dev_name(child_device), child_device,
767 child_device->driver->name, ret);
769 INIT_WORK(&device_ctx->probe_failed_work_item,
770 vmbus_probe_failed_cb);
771 schedule_work(&device_ctx->probe_failed_work_item);
774 DPRINT_ERR(VMBUS_DRV, "probe() method not set for driver - %s",
775 child_device->driver->name);
779 DPRINT_EXIT(VMBUS_DRV);
784 * vmbus_remove - Remove a vmbus device
786 static int vmbus_remove(struct device *child_device)
789 struct driver_context *driver_ctx;
791 DPRINT_ENTER(VMBUS_DRV);
793 /* Special case root bus device */
794 if (child_device->parent == NULL) {
796 * No-op since it is statically defined and handle in
799 DPRINT_EXIT(VMBUS_DRV);
803 if (child_device->driver) {
804 driver_ctx = driver_to_driver_context(child_device->driver);
807 * Let the specific open-source driver handles the removal if
810 if (driver_ctx->remove) {
811 ret = driver_ctx->remove(child_device);
813 DPRINT_ERR(VMBUS_DRV,
814 "remove() method not set for driver - %s",
815 child_device->driver->name);
820 DPRINT_EXIT(VMBUS_DRV);
826 * vmbus_shutdown - Shutdown a vmbus device
828 static void vmbus_shutdown(struct device *child_device)
830 struct driver_context *driver_ctx;
832 DPRINT_ENTER(VMBUS_DRV);
834 /* Special case root bus device */
835 if (child_device->parent == NULL) {
837 * No-op since it is statically defined and handle in
840 DPRINT_EXIT(VMBUS_DRV);
844 /* The device may not be attached yet */
845 if (!child_device->driver) {
846 DPRINT_EXIT(VMBUS_DRV);
850 driver_ctx = driver_to_driver_context(child_device->driver);
852 /* Let the specific open-source driver handles the removal if it can */
853 if (driver_ctx->shutdown)
854 driver_ctx->shutdown(child_device);
856 DPRINT_EXIT(VMBUS_DRV);
862 * vmbus_bus_release - Final callback release of the vmbus root device
864 static void vmbus_bus_release(struct device *device)
866 DPRINT_ENTER(VMBUS_DRV);
868 /* Empty release functions are a bug, or a major sign
869 * of a problem design, this MUST BE FIXED! */
870 dev_err(device, "%s needs to be fixed!\n", __func__);
872 DPRINT_EXIT(VMBUS_DRV);
876 * vmbus_device_release - Final callback release of the vmbus child device
878 static void vmbus_device_release(struct device *device)
880 struct device_context *device_ctx = device_to_device_context(device);
882 DPRINT_ENTER(VMBUS_DRV);
884 /* vmbus_child_device_destroy(&device_ctx->device_obj); */
887 /* !!DO NOT REFERENCE device_ctx anymore at this point!! */
888 DPRINT_EXIT(VMBUS_DRV);
894 * vmbus_msg_dpc - Tasklet routine to handle hypervisor messages
896 static void vmbus_msg_dpc(unsigned long data)
898 struct vmbus_driver *vmbus_drv_obj = (struct vmbus_driver *)data;
900 DPRINT_ENTER(VMBUS_DRV);
902 ASSERT(vmbus_drv_obj->OnMsgDpc != NULL);
904 /* Call to bus driver to handle interrupt */
905 vmbus_drv_obj->OnMsgDpc(&vmbus_drv_obj->Base);
907 DPRINT_EXIT(VMBUS_DRV);
911 * vmbus_msg_dpc - Tasklet routine to handle hypervisor events
913 static void vmbus_event_dpc(unsigned long data)
915 struct vmbus_driver *vmbus_drv_obj = (struct vmbus_driver *)data;
917 DPRINT_ENTER(VMBUS_DRV);
919 ASSERT(vmbus_drv_obj->OnEventDpc != NULL);
921 /* Call to bus driver to handle interrupt */
922 vmbus_drv_obj->OnEventDpc(&vmbus_drv_obj->Base);
924 DPRINT_EXIT(VMBUS_DRV);
927 static irqreturn_t vmbus_isr(int irq, void *dev_id)
929 struct vmbus_driver *vmbus_driver_obj = &g_vmbus_drv.drv_obj;
932 DPRINT_ENTER(VMBUS_DRV);
934 ASSERT(vmbus_driver_obj->OnIsr != NULL);
936 /* Call to bus driver to handle interrupt */
937 ret = vmbus_driver_obj->OnIsr(&vmbus_driver_obj->Base);
939 /* Schedules a dpc if necessary */
941 if (test_bit(0, (unsigned long *)&ret))
942 tasklet_schedule(&g_vmbus_drv.msg_dpc);
944 if (test_bit(1, (unsigned long *)&ret))
945 tasklet_schedule(&g_vmbus_drv.event_dpc);
947 DPRINT_EXIT(VMBUS_DRV);
950 DPRINT_EXIT(VMBUS_DRV);
955 static int __init vmbus_init(void)
959 DPRINT_ENTER(VMBUS_DRV);
961 DPRINT_INFO(VMBUS_DRV,
962 "Vmbus initializing.... current log level 0x%x (%x,%x)",
963 vmbus_loglevel, HIWORD(vmbus_loglevel), LOWORD(vmbus_loglevel));
964 /* Todo: it is used for loglevel, to be ported to new kernel. */
966 ret = vmbus_bus_init(VmbusInitialize);
968 DPRINT_EXIT(VMBUS_DRV);
972 static void __exit vmbus_exit(void)
974 DPRINT_ENTER(VMBUS_DRV);
977 /* Todo: it is used for loglevel, to be ported to new kernel. */
978 DPRINT_EXIT(VMBUS_DRV);
982 MODULE_LICENSE("GPL");
983 module_param(vmbus_irq, int, S_IRUGO);
984 module_param(vmbus_loglevel, int, S_IRUGO);
986 module_init(vmbus_init);
987 module_exit(vmbus_exit);