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Realtek cr: Add autosuspend function.
[zen-stable.git] / drivers / staging / hv / vmbus_drv.c
blobec1d38cd481c74a8eec2e9df608762d4417b33bb
1 /*
2 * Copyright (c) 2009, Microsoft Corporation.
3 *
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.
7 *
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
11 * more details.
12 *
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.
16 *
17 * Authors:
18 * Haiyang Zhang <haiyangz@microsoft.com>
19 * Hank Janssen <hjanssen@microsoft.com>
20 * K. Y. Srinivasan <kys@microsoft.com>
21 *
22 */
23 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
24
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>
37
38 #include "hyperv.h"
39 #include "hyperv_vmbus.h"
40
41
42 static struct pci_dev *hv_pci_dev;
43
44 static struct tasklet_struct msg_dpc;
45 static struct tasklet_struct event_dpc;
46
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); */
51
52 static int pci_probe_error;
53 static struct completion probe_event;
54 static int irq;
55
56 static void get_channel_info(struct hv_device *device,
57 struct hv_device_info *info)
58 {
59 struct vmbus_channel_debug_info debug_info;
60
61 if (!device->channel)
62 return;
63
64 vmbus_get_debug_info(device->channel, &debug_info);
65
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));
72
73 info->monitor_id = debug_info.monitorid;
74
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;
78
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;
82
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;
90
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;
99 }
100
101 /*
102 * vmbus_show_device_attr - Show the device attribute in sysfs.
103 *
104 * This is invoked when user does a
105 * "cat /sys/bus/vmbus/devices/<busdevice>/<attr name>"
106 */
107 static ssize_t vmbus_show_device_attr(struct device *dev,
108 struct device_attribute *dev_attr,
109 char *buf)
110 {
111 struct hv_device *device_ctx = device_to_hv_device(dev);
112 struct hv_device_info device_info;
113
114 memset(&device_info, 0, sizeof(struct hv_device_info));
115
116 get_channel_info(device_ctx, &device_info);
117
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);
200 } else {
201 return 0;
202 }
203 }
204
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),
212
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),
216
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),
220
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),
226
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),
232 __ATTR_NULL
233 };
234
235
236 /*
237 * vmbus_uevent - add uevent for our device
238 *
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
242 */
243 static int vmbus_uevent(struct device *device, struct kobj_uevent_env *env)
244 {
245 struct hv_device *dev = device_to_hv_device(device);
246 int ret;
247
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]);
267
268 if (ret)
269 return ret;
270
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]);
290 if (ret)
291 return ret;
292
293 return 0;
294 }
295
296
297 /*
298 * vmbus_match - Attempt to match the specified device to the specified driver
299 */
300 static int vmbus_match(struct device *device, struct device_driver *driver)
301 {
302 int match = 0;
303 struct hv_driver *drv = drv_to_hv_drv(driver);
304 struct hv_device *device_ctx = device_to_hv_device(device);
305
306 /* We found our driver ? */
307 if (memcmp(&device_ctx->dev_type, &drv->dev_type,
308 sizeof(struct hv_guid)) == 0)
309 match = 1;
310
311 return match;
312 }
313
314 /*
315 * vmbus_probe - Add the new vmbus's child device
316 */
317 static int vmbus_probe(struct device *child_device)
318 {
319 int ret = 0;
320 struct hv_driver *drv =
321 drv_to_hv_drv(child_device->driver);
322 struct hv_device *dev = device_to_hv_device(child_device);
323
324 if (drv->probe) {
325 ret = drv->probe(dev);
326 if (ret != 0)
327 pr_err("probe failed for device %s (%d)\n",
328 dev_name(child_device), ret);
329
330 } else {
331 pr_err("probe not set for driver %s\n",
332 dev_name(child_device));
333 ret = -1;
334 }
335 return ret;
336 }
337
338 /*
339 * vmbus_remove - Remove a vmbus device
340 */
341 static int vmbus_remove(struct device *child_device)
342 {
343 int ret;
344 struct hv_driver *drv;
345
346 struct hv_device *dev = device_to_hv_device(child_device);
347
348 if (child_device->driver) {
349 drv = drv_to_hv_drv(child_device->driver);
350
351 if (drv->remove) {
352 ret = drv->remove(dev);
353 } else {
354 pr_err("remove not set for driver %s\n",
355 dev_name(child_device));
356 ret = -1;
357 }
358 }
359
360 return 0;
361 }
362
363
364 /*
365 * vmbus_shutdown - Shutdown a vmbus device
366 */
367 static void vmbus_shutdown(struct device *child_device)
368 {
369 struct hv_driver *drv;
370 struct hv_device *dev = device_to_hv_device(child_device);
371
372
373 /* The device may not be attached yet */
374 if (!child_device->driver)
375 return;
376
377 drv = drv_to_hv_drv(child_device->driver);
378
379 if (drv->shutdown)
380 drv->shutdown(dev);
381
382 return;
383 }
384
385
386 /*
387 * vmbus_device_release - Final callback release of the vmbus child device
388 */
389 static void vmbus_device_release(struct device *device)
390 {
391 struct hv_device *device_ctx = device_to_hv_device(device);
392
393 kfree(device_ctx);
394
395 }
396
397 /* The one and only one */
398 static struct bus_type hv_bus = {
399 .name = "vmbus",
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,
406 };
407
408 static const char *driver_name = "hyperv";
409
410
411 struct onmessage_work_context {
412 struct work_struct work;
413 struct hv_message msg;
414 };
415
416 static void vmbus_onmessage_work(struct work_struct *work)
417 {
418 struct onmessage_work_context *ctx;
419
420 ctx = container_of(work, struct onmessage_work_context,
421 work);
422 vmbus_onmessage(&ctx->msg);
423 kfree(ctx);
424 }
425
426 /*
427 * vmbus_on_msg_dpc - DPC routine to handle messages from the hypervisior
428 */
429 static void vmbus_on_msg_dpc(unsigned long data)
430 {
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 +
434 VMBUS_MESSAGE_SINT;
435 struct onmessage_work_context *ctx;
436
437 while (1) {
438 if (msg->header.message_type == HVMSG_NONE) {
439 /* no msg */
440 break;
441 } else {
442 ctx = kmalloc(sizeof(*ctx), GFP_ATOMIC);
443 if (ctx == NULL)
444 continue;
445 INIT_WORK(&ctx->work, vmbus_onmessage_work);
446 memcpy(&ctx->msg, msg, sizeof(*msg));
447 queue_work(vmbus_connection.work_queue, &ctx->work);
448 }
449
450 msg->header.message_type = HVMSG_NONE;
451
452 /*
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
457 * no empty slot
458 */
459 mb();
460
461 if (msg->header.message_flags.msg_pending) {
462 /*
463 * This will cause message queue rescan to
464 * possibly deliver another msg from the
465 * hypervisor
466 */
467 wrmsrl(HV_X64_MSR_EOM, 0);
468 }
469 }
470 }
471
472 /*
473 * vmbus_on_isr - ISR routine
474 */
475 static int vmbus_on_isr(void)
476 {
477 int ret = 0;
478 int cpu = smp_processor_id();
479 void *page_addr;
480 struct hv_message *msg;
481 union hv_synic_event_flags *event;
482
483 page_addr = hv_context.synic_message_page[cpu];
484 msg = (struct hv_message *)page_addr + VMBUS_MESSAGE_SINT;
485
486 /* Check if there are actual msgs to be process */
487 if (msg->header.message_type != HVMSG_NONE)
488 ret |= 0x1;
489
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;
493
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]))
496 ret |= 0x2;
497
498 return ret;
499 }
500
501
502 static irqreturn_t vmbus_isr(int irq, void *dev_id)
503 {
504 int ret;
505
506 ret = vmbus_on_isr();
507
508 /* Schedules a dpc if necessary */
509 if (ret > 0) {
510 if (test_bit(0, (unsigned long *)&ret))
511 tasklet_schedule(&msg_dpc);
512
513 if (test_bit(1, (unsigned long *)&ret))
514 tasklet_schedule(&event_dpc);
515
516 return IRQ_HANDLED;
517 } else {
518 return IRQ_NONE;
519 }
520 }
521
522 /*
523 * vmbus_bus_init -Main vmbus driver initialization routine.
524 *
525 * Here, we
526 * - initialize the vmbus driver context
527 * - invoke the vmbus hv main init routine
528 * - get the irq resource
529 * - retrieve the channel offers
530 */
531 static int vmbus_bus_init(struct pci_dev *pdev)
532 {
533 int ret;
534 unsigned int vector;
535
536 /* Hypervisor initialization...setup hypercall page..etc */
537 ret = hv_init();
538 if (ret != 0) {
539 pr_err("Unable to initialize the hypervisor - 0x%x\n", ret);
540 goto cleanup;
541 }
542
543 /* Initialize the bus context */
544 tasklet_init(&msg_dpc, vmbus_on_msg_dpc, 0);
545 tasklet_init(&event_dpc, vmbus_on_event, 0);
546
547 /* Now, register the bus with LDM */
548 ret = bus_register(&hv_bus);
549 if (ret) {
550 ret = -1;
551 goto cleanup;
552 }
553
554 /* Get the interrupt resource */
555 ret = request_irq(pdev->irq, vmbus_isr,
556 IRQF_SHARED | IRQF_SAMPLE_RANDOM,
557 driver_name, pdev);
558
559 if (ret != 0) {
560 pr_err("Unable to request IRQ %d\n",
561 pdev->irq);
562
563 bus_unregister(&hv_bus);
564
565 ret = -1;
566 goto cleanup;
567 }
568
569 vector = IRQ0_VECTOR + pdev->irq;
570
571 /*
572 * Notify the hypervisor of our irq and
573 * connect to the host.
574 */
575 on_each_cpu(hv_synic_init, (void *)&vector, 1);
576 ret = vmbus_connect();
577 if (ret) {
578 free_irq(pdev->irq, pdev);
579 bus_unregister(&hv_bus);
580 goto cleanup;
581 }
582
583
584 vmbus_request_offers();
585
586 cleanup:
587 return ret;
588 }
589
590 /**
591 * vmbus_child_driver_register() - Register a vmbus's child driver
592 * @drv: Pointer to driver structure you want to register
593 *
594 *
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.
598 *
599 * Mainly used by Hyper-V drivers.
600 */
601 int vmbus_child_driver_register(struct device_driver *drv)
602 {
603 int ret;
604
605 pr_info("child driver registering - name %s\n", drv->name);
606
607 /* The child driver on this vmbus */
608 drv->bus = &hv_bus;
609
610 ret = driver_register(drv);
611
612 vmbus_request_offers();
613
614 return ret;
615 }
616 EXPORT_SYMBOL(vmbus_child_driver_register);
617
618 /**
619 * vmbus_child_driver_unregister() - Unregister a vmbus's child driver
620 * @drv: Pointer to driver structure you want to un-register
621 *
622 *
623 * Un-register the given driver with Linux through the 'driver_unregister()'
624 * call. And ungegisters the driver from the Hyper-V vmbus handler.
625 *
626 * Mainly used by Hyper-V drivers.
627 */
628 void vmbus_child_driver_unregister(struct device_driver *drv)
629 {
630 pr_info("child driver unregistering - name %s\n", drv->name);
631
632 driver_unregister(drv);
633
634 drv->bus = NULL;
635 }
636 EXPORT_SYMBOL(vmbus_child_driver_unregister);
637
638 /*
639 * vmbus_child_device_create - Creates and registers a new child device
640 * on the vmbus.
641 */
642 struct hv_device *vmbus_child_device_create(struct hv_guid *type,
643 struct hv_guid *instance,
644 struct vmbus_channel *channel)
645 {
646 struct hv_device *child_device_obj;
647
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");
652 return NULL;
653 }
654
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));
659
660
661 return child_device_obj;
662 }
663
664 /*
665 * vmbus_child_device_register - Register the child device
666 */
667 int vmbus_child_device_register(struct hv_device *child_device_obj)
668 {
669 int ret = 0;
670
671 static atomic_t device_num = ATOMIC_INIT(0);
672
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));
676
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;
681
682 /*
683 * Register with the LDM. This will kick off the driver/device
684 * binding...which will eventually call vmbus_match() and vmbus_probe()
685 */
686 ret = device_register(&child_device_obj->device);
687
688 if (ret)
689 pr_err("Unable to register child device\n");
690 else
691 pr_info("child device %s registered\n",
692 dev_name(&child_device_obj->device));
693
694 return ret;
695 }
696
697 /*
698 * vmbus_child_device_unregister - Remove the specified child device
699 * from the vmbus.
700 */
701 void vmbus_child_device_unregister(struct hv_device *device_obj)
702 {
703 /*
704 * Kick off the process of unregistering the device.
705 * This will call vmbus_remove() and eventually vmbus_device_release()
706 */
707 device_unregister(&device_obj->device);
708
709 pr_info("child device %s unregistered\n",
710 dev_name(&device_obj->device));
711 }
712
713
714 /*
715 * VMBUS is an acpi enumerated device. Get the the IRQ information
716 * from DSDT.
717 */
718
719 static acpi_status vmbus_walk_resources(struct acpi_resource *res, void *irq)
720 {
721
722 if (res->type == ACPI_RESOURCE_TYPE_IRQ) {
723 struct acpi_resource_irq *irqp;
724 irqp = &res->data.irq;
725
726 *((unsigned int *)irq) = irqp->interrupts[0];
727 }
728
729 return AE_OK;
730 }
731
732 static int vmbus_acpi_add(struct acpi_device *device)
733 {
734 acpi_status result;
735
736 result =
737 acpi_walk_resources(device->handle, METHOD_NAME__CRS,
738 vmbus_walk_resources, &irq);
739
740 if (ACPI_FAILURE(result)) {
741 complete(&probe_event);
742 return -ENODEV;
743 }
744 complete(&probe_event);
745 return 0;
746 }
747
748 static const struct acpi_device_id vmbus_acpi_device_ids[] = {
749 {"VMBUS", 0},
750 {"", 0},
751 };
752 MODULE_DEVICE_TABLE(acpi, vmbus_acpi_device_ids);
753
754 static struct acpi_driver vmbus_acpi_driver = {
755 .name = "vmbus",
756 .ids = vmbus_acpi_device_ids,
757 .ops = {
758 .add = vmbus_acpi_add,
759 },
760 };
761
762 static int vmbus_acpi_init(void)
763 {
764 int result;
765
766
767 result = acpi_bus_register_driver(&vmbus_acpi_driver);
768 if (result < 0)
769 return result;
770
771 return 0;
772 }
773
774 static void vmbus_acpi_exit(void)
775 {
776 acpi_bus_unregister_driver(&vmbus_acpi_driver);
777
778 return;
779 }
780
781
782 static int __devinit hv_pci_probe(struct pci_dev *pdev,
783 const struct pci_device_id *ent)
784 {
785 hv_pci_dev = pdev;
786
787 pci_probe_error = pci_enable_device(pdev);
788 if (pci_probe_error)
789 goto probe_cleanup;
790
791 /*
792 * If the PCI sub-sytem did not assign us an
793 * irq, use the bios provided one.
794 */
795
796 if (pdev->irq == 0)
797 pdev->irq = irq;
798
799 pci_probe_error = vmbus_bus_init(pdev);
800
801 if (pci_probe_error)
802 pci_disable_device(pdev);
803
804 probe_cleanup:
805 complete(&probe_event);
806 return pci_probe_error;
807 }
808
809 /*
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.
814 */
815 static const struct pci_device_id microsoft_hv_pci_table[] = {
816 { PCI_DEVICE(0x1414, 0x5353) }, /* VGA compatible controller */
817 { 0 }
818 };
819 MODULE_DEVICE_TABLE(pci, microsoft_hv_pci_table);
820
821 static struct pci_driver hv_bus_driver = {
822 .name = "hv_bus",
823 .probe = hv_pci_probe,
824 .id_table = microsoft_hv_pci_table,
825 };
826
827 static int __init hv_pci_init(void)
828 {
829 int ret;
830
831 init_completion(&probe_event);
832
833 /*
834 * Get irq resources first.
835 */
836
837 ret = vmbus_acpi_init();
838 if (ret)
839 return ret;
840
841 wait_for_completion(&probe_event);
842
843 if (irq <= 0) {
844 vmbus_acpi_exit();
845 return -ENODEV;
846 }
847
848 vmbus_acpi_exit();
849 init_completion(&probe_event);
850 ret = pci_register_driver(&hv_bus_driver);
851 if (ret)
852 return ret;
853 /*
854 * All the vmbus initialization occurs within the
855 * hv_pci_probe() function. Wait for hv_pci_probe()
856 * to complete.
857 */
858 wait_for_completion(&probe_event);
859
860 if (pci_probe_error)
861 pci_unregister_driver(&hv_bus_driver);
862 return pci_probe_error;
863 }
864
865
866 MODULE_LICENSE("GPL");
867 MODULE_VERSION(HV_DRV_VERSION);
868 module_param(vmbus_loglevel, int, S_IRUGO|S_IWUSR);
869
870 module_init(hv_pci_init);