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Staging: hv: Get rid of vmbus_dev_rm() function
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / drivers / staging / hv / vmbus_drv.c
blob11c69c576e3e5c2aea0c150a45bf23aab489830c
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 */
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"
32 #include "hv_api.h"
33 #include "logging.h"
34 #include "vmbus.h"
35 #include "channel.h"
36 #include "vmbus_private.h"
37
38
39 /* FIXME! We need to do this dynamically for PIC and APIC system */
40 #define VMBUS_IRQ 0x5
41 #define VMBUS_IRQ_VECTOR IRQ5_VECTOR
42
43 /* Main vmbus driver data structure */
44 struct vmbus_driver_context {
45
46 struct bus_type bus;
47 struct tasklet_struct msg_dpc;
48 struct tasklet_struct event_dpc;
49
50 /* The bus root device */
51 struct hv_device device_ctx;
52 };
53
54 static int vmbus_match(struct device *device, struct device_driver *driver);
55 static int vmbus_probe(struct device *device);
56 static int vmbus_remove(struct device *device);
57 static void vmbus_shutdown(struct device *device);
58 static int vmbus_uevent(struct device *device, struct kobj_uevent_env *env);
59
60 static irqreturn_t vmbus_isr(int irq, void *dev_id);
61
62 static void vmbus_device_release(struct device *device);
63 static void vmbus_bus_release(struct device *device);
64
65 static ssize_t vmbus_show_device_attr(struct device *dev,
66 struct device_attribute *dev_attr,
67 char *buf);
68
69
70 unsigned int vmbus_loglevel = (ALL_MODULES << 16 | INFO_LVL);
71 EXPORT_SYMBOL(vmbus_loglevel);
72 /* (ALL_MODULES << 16 | DEBUG_LVL_ENTEREXIT); */
73 /* (((VMBUS | VMBUS_DRV)<<16) | DEBUG_LVL_ENTEREXIT); */
74
75 static int vmbus_irq = VMBUS_IRQ;
76
77 /* Set up per device attributes in /sys/bus/vmbus/devices/<bus device> */
78 static struct device_attribute vmbus_device_attrs[] = {
79 __ATTR(id, S_IRUGO, vmbus_show_device_attr, NULL),
80 __ATTR(state, S_IRUGO, vmbus_show_device_attr, NULL),
81 __ATTR(class_id, S_IRUGO, vmbus_show_device_attr, NULL),
82 __ATTR(device_id, S_IRUGO, vmbus_show_device_attr, NULL),
83 __ATTR(monitor_id, S_IRUGO, vmbus_show_device_attr, NULL),
84
85 __ATTR(server_monitor_pending, S_IRUGO, vmbus_show_device_attr, NULL),
86 __ATTR(server_monitor_latency, S_IRUGO, vmbus_show_device_attr, NULL),
87 __ATTR(server_monitor_conn_id, S_IRUGO, vmbus_show_device_attr, NULL),
88
89 __ATTR(client_monitor_pending, S_IRUGO, vmbus_show_device_attr, NULL),
90 __ATTR(client_monitor_latency, S_IRUGO, vmbus_show_device_attr, NULL),
91 __ATTR(client_monitor_conn_id, S_IRUGO, vmbus_show_device_attr, NULL),
92
93 __ATTR(out_intr_mask, S_IRUGO, vmbus_show_device_attr, NULL),
94 __ATTR(out_read_index, S_IRUGO, vmbus_show_device_attr, NULL),
95 __ATTR(out_write_index, S_IRUGO, vmbus_show_device_attr, NULL),
96 __ATTR(out_read_bytes_avail, S_IRUGO, vmbus_show_device_attr, NULL),
97 __ATTR(out_write_bytes_avail, S_IRUGO, vmbus_show_device_attr, NULL),
98
99 __ATTR(in_intr_mask, S_IRUGO, vmbus_show_device_attr, NULL),
100 __ATTR(in_read_index, S_IRUGO, vmbus_show_device_attr, NULL),
101 __ATTR(in_write_index, S_IRUGO, vmbus_show_device_attr, NULL),
102 __ATTR(in_read_bytes_avail, S_IRUGO, vmbus_show_device_attr, NULL),
103 __ATTR(in_write_bytes_avail, S_IRUGO, vmbus_show_device_attr, NULL),
104 __ATTR_NULL
105 };
106
107 /* The one and only one */
108 static struct vmbus_driver_context vmbus_drv = {
109 .bus.name = "vmbus",
110 .bus.match = vmbus_match,
111 .bus.shutdown = vmbus_shutdown,
112 .bus.remove = vmbus_remove,
113 .bus.probe = vmbus_probe,
114 .bus.uevent = vmbus_uevent,
115 .bus.dev_attrs = vmbus_device_attrs,
116 };
117
118 static const char *driver_name = "hyperv";
119
120 /*
121 * Windows vmbus does not defined this.
122 * We defined this to be consistent with other devices
123 */
124 /* {c5295816-f63a-4d5f-8d1a-4daf999ca185} */
125 static const struct hv_guid device_type = {
126 .data = {
127 0x16, 0x58, 0x29, 0xc5, 0x3a, 0xf6, 0x5f, 0x4d,
128 0x8d, 0x1a, 0x4d, 0xaf, 0x99, 0x9c, 0xa1, 0x85
129 }
130 };
131
132 /* {ac3760fc-9adf-40aa-9427-a70ed6de95c5} */
133 static const struct hv_guid device_id = {
134 .data = {
135 0xfc, 0x60, 0x37, 0xac, 0xdf, 0x9a, 0xaa, 0x40,
136 0x94, 0x27, 0xa7, 0x0e, 0xd6, 0xde, 0x95, 0xc5
137 }
138 };
139
140 static struct hv_device *vmbus_device; /* vmbus root device */
141
142 /*
143 * vmbus_child_dev_add - Registers the child device with the vmbus
144 */
145 int vmbus_child_dev_add(struct hv_device *child_dev)
146 {
147 return vmbus_child_device_register(vmbus_device, child_dev);
148 }
149
150 /*
151 * vmbus_dev_add - Callback when the root bus device is added
152 */
153 static int vmbus_dev_add(struct hv_device *dev, void *info)
154 {
155 u32 *irqvector = info;
156 int ret;
157
158 vmbus_device = dev;
159
160 memcpy(&vmbus_device->dev_type, &device_type, sizeof(struct hv_guid));
161 memcpy(&vmbus_device->dev_instance, &device_id,
162 sizeof(struct hv_guid));
163
164 /* strcpy(dev->name, "vmbus"); */
165 /* SynIC setup... */
166 on_each_cpu(hv_synic_init, (void *)irqvector, 1);
167
168 /* Connect to VMBus in the root partition */
169 ret = vmbus_connect();
170
171 /* VmbusSendEvent(device->localPortId+1); */
172 return ret;
173 }
174
175
176 /*
177 * vmbus_cleanup - Perform any cleanup when the driver is removed
178 */
179 static void vmbus_cleanup(void)
180 {
181
182 hv_cleanup();
183 }
184
185 struct onmessage_work_context {
186 struct work_struct work;
187 struct hv_message msg;
188 };
189
190 static void vmbus_onmessage_work(struct work_struct *work)
191 {
192 struct onmessage_work_context *ctx;
193
194 ctx = container_of(work, struct onmessage_work_context,
195 work);
196 vmbus_onmessage(&ctx->msg);
197 kfree(ctx);
198 }
199
200 /*
201 * vmbus_on_msg_dpc - DPC routine to handle messages from the hypervisior
202 */
203 static void vmbus_on_msg_dpc(unsigned long data)
204 {
205 int cpu = smp_processor_id();
206 void *page_addr = hv_context.synic_message_page[cpu];
207 struct hv_message *msg = (struct hv_message *)page_addr +
208 VMBUS_MESSAGE_SINT;
209 struct onmessage_work_context *ctx;
210
211 while (1) {
212 if (msg->header.message_type == HVMSG_NONE) {
213 /* no msg */
214 break;
215 } else {
216 ctx = kmalloc(sizeof(*ctx), GFP_ATOMIC);
217 if (ctx == NULL)
218 continue;
219 INIT_WORK(&ctx->work, vmbus_onmessage_work);
220 memcpy(&ctx->msg, msg, sizeof(*msg));
221 queue_work(vmbus_connection.work_queue, &ctx->work);
222 }
223
224 msg->header.message_type = HVMSG_NONE;
225
226 /*
227 * Make sure the write to MessageType (ie set to
228 * HVMSG_NONE) happens before we read the
229 * MessagePending and EOMing. Otherwise, the EOMing
230 * will not deliver any more messages since there is
231 * no empty slot
232 */
233 mb();
234
235 if (msg->header.message_flags.msg_pending) {
236 /*
237 * This will cause message queue rescan to
238 * possibly deliver another msg from the
239 * hypervisor
240 */
241 wrmsrl(HV_X64_MSR_EOM, 0);
242 }
243 }
244 }
245
246 /*
247 * vmbus_on_isr - ISR routine
248 */
249 static int vmbus_on_isr(void)
250 {
251 int ret = 0;
252 int cpu = smp_processor_id();
253 void *page_addr;
254 struct hv_message *msg;
255 union hv_synic_event_flags *event;
256
257 page_addr = hv_context.synic_message_page[cpu];
258 msg = (struct hv_message *)page_addr + VMBUS_MESSAGE_SINT;
259
260 /* Check if there are actual msgs to be process */
261 if (msg->header.message_type != HVMSG_NONE) {
262 DPRINT_DBG(VMBUS, "received msg type %d size %d",
263 msg->header.message_type,
264 msg->header.payload_size);
265 ret |= 0x1;
266 }
267
268 /* TODO: Check if there are events to be process */
269 page_addr = hv_context.synic_event_page[cpu];
270 event = (union hv_synic_event_flags *)page_addr + VMBUS_MESSAGE_SINT;
271
272 /* Since we are a child, we only need to check bit 0 */
273 if (test_and_clear_bit(0, (unsigned long *) &event->flags32[0])) {
274 DPRINT_DBG(VMBUS, "received event %d", event->flags32[0]);
275 ret |= 0x2;
276 }
277
278 return ret;
279 }
280
281 static void get_channel_info(struct hv_device *device,
282 struct hv_device_info *info)
283 {
284 struct vmbus_channel_debug_info debug_info;
285
286 if (!device->channel)
287 return;
288
289 vmbus_get_debug_info(device->channel, &debug_info);
290
291 info->chn_id = debug_info.relid;
292 info->chn_state = debug_info.state;
293 memcpy(&info->chn_type, &debug_info.interfacetype,
294 sizeof(struct hv_guid));
295 memcpy(&info->chn_instance, &debug_info.interface_instance,
296 sizeof(struct hv_guid));
297
298 info->monitor_id = debug_info.monitorid;
299
300 info->server_monitor_pending = debug_info.servermonitor_pending;
301 info->server_monitor_latency = debug_info.servermonitor_latency;
302 info->server_monitor_conn_id = debug_info.servermonitor_connectionid;
303
304 info->client_monitor_pending = debug_info.clientmonitor_pending;
305 info->client_monitor_latency = debug_info.clientmonitor_latency;
306 info->client_monitor_conn_id = debug_info.clientmonitor_connectionid;
307
308 info->inbound.int_mask = debug_info.inbound.current_interrupt_mask;
309 info->inbound.read_idx = debug_info.inbound.current_read_index;
310 info->inbound.write_idx = debug_info.inbound.current_write_index;
311 info->inbound.bytes_avail_toread =
312 debug_info.inbound.bytes_avail_toread;
313 info->inbound.bytes_avail_towrite =
314 debug_info.inbound.bytes_avail_towrite;
315
316 info->outbound.int_mask =
317 debug_info.outbound.current_interrupt_mask;
318 info->outbound.read_idx = debug_info.outbound.current_read_index;
319 info->outbound.write_idx = debug_info.outbound.current_write_index;
320 info->outbound.bytes_avail_toread =
321 debug_info.outbound.bytes_avail_toread;
322 info->outbound.bytes_avail_towrite =
323 debug_info.outbound.bytes_avail_towrite;
324 }
325
326 /*
327 * vmbus_show_device_attr - Show the device attribute in sysfs.
328 *
329 * This is invoked when user does a
330 * "cat /sys/bus/vmbus/devices/<busdevice>/<attr name>"
331 */
332 static ssize_t vmbus_show_device_attr(struct device *dev,
333 struct device_attribute *dev_attr,
334 char *buf)
335 {
336 struct hv_device *device_ctx = device_to_hv_device(dev);
337 struct hv_device_info device_info;
338
339 memset(&device_info, 0, sizeof(struct hv_device_info));
340
341 get_channel_info(device_ctx, &device_info);
342
343 if (!strcmp(dev_attr->attr.name, "class_id")) {
344 return sprintf(buf, "{%02x%02x%02x%02x-%02x%02x-%02x%02x-"
345 "%02x%02x%02x%02x%02x%02x%02x%02x}\n",
346 device_info.chn_type.data[3],
347 device_info.chn_type.data[2],
348 device_info.chn_type.data[1],
349 device_info.chn_type.data[0],
350 device_info.chn_type.data[5],
351 device_info.chn_type.data[4],
352 device_info.chn_type.data[7],
353 device_info.chn_type.data[6],
354 device_info.chn_type.data[8],
355 device_info.chn_type.data[9],
356 device_info.chn_type.data[10],
357 device_info.chn_type.data[11],
358 device_info.chn_type.data[12],
359 device_info.chn_type.data[13],
360 device_info.chn_type.data[14],
361 device_info.chn_type.data[15]);
362 } else if (!strcmp(dev_attr->attr.name, "device_id")) {
363 return sprintf(buf, "{%02x%02x%02x%02x-%02x%02x-%02x%02x-"
364 "%02x%02x%02x%02x%02x%02x%02x%02x}\n",
365 device_info.chn_instance.data[3],
366 device_info.chn_instance.data[2],
367 device_info.chn_instance.data[1],
368 device_info.chn_instance.data[0],
369 device_info.chn_instance.data[5],
370 device_info.chn_instance.data[4],
371 device_info.chn_instance.data[7],
372 device_info.chn_instance.data[6],
373 device_info.chn_instance.data[8],
374 device_info.chn_instance.data[9],
375 device_info.chn_instance.data[10],
376 device_info.chn_instance.data[11],
377 device_info.chn_instance.data[12],
378 device_info.chn_instance.data[13],
379 device_info.chn_instance.data[14],
380 device_info.chn_instance.data[15]);
381 } else if (!strcmp(dev_attr->attr.name, "state")) {
382 return sprintf(buf, "%d\n", device_info.chn_state);
383 } else if (!strcmp(dev_attr->attr.name, "id")) {
384 return sprintf(buf, "%d\n", device_info.chn_id);
385 } else if (!strcmp(dev_attr->attr.name, "out_intr_mask")) {
386 return sprintf(buf, "%d\n", device_info.outbound.int_mask);
387 } else if (!strcmp(dev_attr->attr.name, "out_read_index")) {
388 return sprintf(buf, "%d\n", device_info.outbound.read_idx);
389 } else if (!strcmp(dev_attr->attr.name, "out_write_index")) {
390 return sprintf(buf, "%d\n", device_info.outbound.write_idx);
391 } else if (!strcmp(dev_attr->attr.name, "out_read_bytes_avail")) {
392 return sprintf(buf, "%d\n",
393 device_info.outbound.bytes_avail_toread);
394 } else if (!strcmp(dev_attr->attr.name, "out_write_bytes_avail")) {
395 return sprintf(buf, "%d\n",
396 device_info.outbound.bytes_avail_towrite);
397 } else if (!strcmp(dev_attr->attr.name, "in_intr_mask")) {
398 return sprintf(buf, "%d\n", device_info.inbound.int_mask);
399 } else if (!strcmp(dev_attr->attr.name, "in_read_index")) {
400 return sprintf(buf, "%d\n", device_info.inbound.read_idx);
401 } else if (!strcmp(dev_attr->attr.name, "in_write_index")) {
402 return sprintf(buf, "%d\n", device_info.inbound.write_idx);
403 } else if (!strcmp(dev_attr->attr.name, "in_read_bytes_avail")) {
404 return sprintf(buf, "%d\n",
405 device_info.inbound.bytes_avail_toread);
406 } else if (!strcmp(dev_attr->attr.name, "in_write_bytes_avail")) {
407 return sprintf(buf, "%d\n",
408 device_info.inbound.bytes_avail_towrite);
409 } else if (!strcmp(dev_attr->attr.name, "monitor_id")) {
410 return sprintf(buf, "%d\n", device_info.monitor_id);
411 } else if (!strcmp(dev_attr->attr.name, "server_monitor_pending")) {
412 return sprintf(buf, "%d\n", device_info.server_monitor_pending);
413 } else if (!strcmp(dev_attr->attr.name, "server_monitor_latency")) {
414 return sprintf(buf, "%d\n", device_info.server_monitor_latency);
415 } else if (!strcmp(dev_attr->attr.name, "server_monitor_conn_id")) {
416 return sprintf(buf, "%d\n",
417 device_info.server_monitor_conn_id);
418 } else if (!strcmp(dev_attr->attr.name, "client_monitor_pending")) {
419 return sprintf(buf, "%d\n", device_info.client_monitor_pending);
420 } else if (!strcmp(dev_attr->attr.name, "client_monitor_latency")) {
421 return sprintf(buf, "%d\n", device_info.client_monitor_latency);
422 } else if (!strcmp(dev_attr->attr.name, "client_monitor_conn_id")) {
423 return sprintf(buf, "%d\n",
424 device_info.client_monitor_conn_id);
425 } else {
426 return 0;
427 }
428 }
429
430 /*
431 * vmbus_bus_init -Main vmbus driver initialization routine.
432 *
433 * Here, we
434 * - initialize the vmbus driver context
435 * - setup various driver entry points
436 * - invoke the vmbus hv main init routine
437 * - get the irq resource
438 * - invoke the vmbus to add the vmbus root device
439 * - setup the vmbus root device
440 * - retrieve the channel offers
441 */
442 static int vmbus_bus_init(void)
443 {
444 struct vmbus_driver_context *vmbus_drv_ctx = &vmbus_drv;
445 struct hv_device *dev_ctx = &vmbus_drv.device_ctx;
446 int ret;
447 unsigned int vector;
448
449 DPRINT_INFO(VMBUS, "+++++++ HV Driver version = %s +++++++",
450 HV_DRV_VERSION);
451 DPRINT_INFO(VMBUS, "+++++++ Vmbus supported version = %d +++++++",
452 VMBUS_REVISION_NUMBER);
453 DPRINT_INFO(VMBUS, "+++++++ Vmbus using SINT %d +++++++",
454 VMBUS_MESSAGE_SINT);
455 DPRINT_DBG(VMBUS, "sizeof(vmbus_channel_packet_page_buffer)=%zd, "
456 "sizeof(VMBUS_CHANNEL_PACKET_MULITPAGE_BUFFER)=%zd",
457 sizeof(struct vmbus_channel_packet_page_buffer),
458 sizeof(struct vmbus_channel_packet_multipage_buffer));
459
460
461 /* Hypervisor initialization...setup hypercall page..etc */
462 ret = hv_init();
463 if (ret != 0) {
464 DPRINT_ERR(VMBUS, "Unable to initialize the hypervisor - 0x%x",
465 ret);
466 goto cleanup;
467 }
468
469
470 vmbus_drv_ctx->bus.name = driver_name;
471
472 /* Initialize the bus context */
473 tasklet_init(&vmbus_drv_ctx->msg_dpc, vmbus_on_msg_dpc,
474 (unsigned long)NULL);
475 tasklet_init(&vmbus_drv_ctx->event_dpc, vmbus_on_event,
476 (unsigned long)NULL);
477
478 /* Now, register the bus with LDM */
479 ret = bus_register(&vmbus_drv_ctx->bus);
480 if (ret) {
481 ret = -1;
482 goto cleanup;
483 }
484
485 /* Get the interrupt resource */
486 ret = request_irq(vmbus_irq, vmbus_isr, IRQF_SAMPLE_RANDOM,
487 driver_name, NULL);
488
489 if (ret != 0) {
490 DPRINT_ERR(VMBUS_DRV, "ERROR - Unable to request IRQ %d",
491 vmbus_irq);
492
493 bus_unregister(&vmbus_drv_ctx->bus);
494
495 ret = -1;
496 goto cleanup;
497 }
498 vector = VMBUS_IRQ_VECTOR;
499
500 DPRINT_INFO(VMBUS_DRV, "irq 0x%x vector 0x%x", vmbus_irq, vector);
501
502 /* Add the root device */
503 memset(dev_ctx, 0, sizeof(struct hv_device));
504
505 ret = vmbus_dev_add(dev_ctx, &vector);
506 if (ret != 0) {
507 DPRINT_ERR(VMBUS_DRV,
508 "ERROR - Unable to add vmbus root device");
509
510 free_irq(vmbus_irq, NULL);
511
512 bus_unregister(&vmbus_drv_ctx->bus);
513
514 ret = -1;
515 goto cleanup;
516 }
517 /* strcpy(dev_ctx->device.bus_id, dev_ctx->device_obj.name); */
518 dev_set_name(&dev_ctx->device, "vmbus_0_0");
519
520 /* No need to bind a driver to the root device. */
521 dev_ctx->device.parent = NULL;
522 /* NULL; vmbus_remove() does not get invoked */
523 dev_ctx->device.bus = &vmbus_drv_ctx->bus;
524
525 /* Setup the device dispatch table */
526 dev_ctx->device.release = vmbus_bus_release;
527
528 /* register the root device */
529 ret = device_register(&dev_ctx->device);
530 if (ret) {
531 DPRINT_ERR(VMBUS_DRV,
532 "ERROR - Unable to register vmbus root device");
533
534 free_irq(vmbus_irq, NULL);
535 bus_unregister(&vmbus_drv_ctx->bus);
536
537 ret = -1;
538 goto cleanup;
539 }
540
541 vmbus_request_offers();
542 wait_for_completion(&hv_channel_ready);
543
544 cleanup:
545 return ret;
546 }
547
548 /*
549 * vmbus_bus_exit - Terminate the vmbus driver.
550 *
551 * This routine is opposite of vmbus_bus_init()
552 */
553 static void vmbus_bus_exit(void)
554 {
555 struct vmbus_driver_context *vmbus_drv_ctx = &vmbus_drv;
556
557 struct hv_device *dev_ctx = &vmbus_drv.device_ctx;
558
559 vmbus_release_unattached_channels();
560 vmbus_disconnect();
561 on_each_cpu(hv_synic_cleanup, NULL, 1);
562
563 vmbus_cleanup();
564
565 /* Unregister the root bus device */
566 device_unregister(&dev_ctx->device);
567
568 bus_unregister(&vmbus_drv_ctx->bus);
569
570 free_irq(vmbus_irq, NULL);
571
572 tasklet_kill(&vmbus_drv_ctx->msg_dpc);
573 tasklet_kill(&vmbus_drv_ctx->event_dpc);
574 }
575
576
577 /**
578 * vmbus_child_driver_register() - Register a vmbus's child driver
579 * @drv: Pointer to driver structure you want to register
580 *
581 *
582 * Registers the given driver with Linux through the 'driver_register()' call
583 * And sets up the hyper-v vmbus handling for this driver.
584 * It will return the state of the 'driver_register()' call.
585 *
586 * Mainly used by Hyper-V drivers.
587 */
588 int vmbus_child_driver_register(struct device_driver *drv)
589 {
590 int ret;
591
592 DPRINT_INFO(VMBUS_DRV, "child driver (%p) registering - name %s",
593 drv, drv->name);
594
595 /* The child driver on this vmbus */
596 drv->bus = &vmbus_drv.bus;
597
598 ret = driver_register(drv);
599
600 vmbus_request_offers();
601
602 return ret;
603 }
604 EXPORT_SYMBOL(vmbus_child_driver_register);
605
606 /**
607 * vmbus_child_driver_unregister() - Unregister a vmbus's child driver
608 * @drv: Pointer to driver structure you want to un-register
609 *
610 *
611 * Un-register the given driver with Linux through the 'driver_unregister()'
612 * call. And ungegisters the driver from the Hyper-V vmbus handler.
613 *
614 * Mainly used by Hyper-V drivers.
615 */
616 void vmbus_child_driver_unregister(struct device_driver *drv)
617 {
618 DPRINT_INFO(VMBUS_DRV, "child driver (%p) unregistering - name %s",
619 drv, drv->name);
620
621 driver_unregister(drv);
622
623 drv->bus = NULL;
624 }
625 EXPORT_SYMBOL(vmbus_child_driver_unregister);
626
627 /*
628 * vmbus_child_device_create - Creates and registers a new child device
629 * on the vmbus.
630 */
631 struct hv_device *vmbus_child_device_create(struct hv_guid *type,
632 struct hv_guid *instance,
633 struct vmbus_channel *channel)
634 {
635 struct hv_device *child_device_obj;
636
637 /* Allocate the new child device */
638 child_device_obj = kzalloc(sizeof(struct hv_device), GFP_KERNEL);
639 if (!child_device_obj) {
640 DPRINT_ERR(VMBUS_DRV,
641 "unable to allocate device_context for child device");
642 return NULL;
643 }
644
645 DPRINT_DBG(VMBUS_DRV, "child device (%p) allocated - "
646 "type {%02x%02x%02x%02x-%02x%02x-%02x%02x-"
647 "%02x%02x%02x%02x%02x%02x%02x%02x},"
648 "id {%02x%02x%02x%02x-%02x%02x-%02x%02x-"
649 "%02x%02x%02x%02x%02x%02x%02x%02x}",
650 &child_device_obj->device,
651 type->data[3], type->data[2], type->data[1], type->data[0],
652 type->data[5], type->data[4], type->data[7], type->data[6],
653 type->data[8], type->data[9], type->data[10], type->data[11],
654 type->data[12], type->data[13], type->data[14], type->data[15],
655 instance->data[3], instance->data[2],
656 instance->data[1], instance->data[0],
657 instance->data[5], instance->data[4],
658 instance->data[7], instance->data[6],
659 instance->data[8], instance->data[9],
660 instance->data[10], instance->data[11],
661 instance->data[12], instance->data[13],
662 instance->data[14], instance->data[15]);
663
664 child_device_obj->channel = channel;
665 memcpy(&child_device_obj->dev_type, type, sizeof(struct hv_guid));
666 memcpy(&child_device_obj->dev_instance, instance,
667 sizeof(struct hv_guid));
668
669
670 return child_device_obj;
671 }
672
673 /*
674 * vmbus_child_device_register - Register the child device on the specified bus
675 */
676 int vmbus_child_device_register(struct hv_device *root_device_obj,
677 struct hv_device *child_device_obj)
678 {
679 int ret = 0;
680
681 static atomic_t device_num = ATOMIC_INIT(0);
682
683 DPRINT_DBG(VMBUS_DRV, "child device (%p) registering",
684 child_device_obj);
685
686 /* Set the device name. Otherwise, device_register() will fail. */
687 dev_set_name(&child_device_obj->device, "vmbus_0_%d",
688 atomic_inc_return(&device_num));
689
690 /* The new device belongs to this bus */
691 child_device_obj->device.bus = &vmbus_drv.bus; /* device->dev.bus; */
692 child_device_obj->device.parent = &root_device_obj->device;
693 child_device_obj->device.release = vmbus_device_release;
694
695 /*
696 * Register with the LDM. This will kick off the driver/device
697 * binding...which will eventually call vmbus_match() and vmbus_probe()
698 */
699 ret = device_register(&child_device_obj->device);
700
701 /* vmbus_probe() error does not get propergate to device_register(). */
702 ret = child_device_obj->probe_error;
703
704 if (ret)
705 DPRINT_ERR(VMBUS_DRV, "unable to register child device (%p)",
706 &child_device_obj->device);
707 else
708 DPRINT_INFO(VMBUS_DRV, "child device (%p) registered",
709 &child_device_obj->device);
710
711 return ret;
712 }
713
714 /*
715 * vmbus_child_device_unregister - Remove the specified child device
716 * from the vmbus.
717 */
718 void vmbus_child_device_unregister(struct hv_device *device_obj)
719 {
720
721 DPRINT_INFO(VMBUS_DRV, "unregistering child device (%p)",
722 &device_obj->device);
723
724 /*
725 * Kick off the process of unregistering the device.
726 * This will call vmbus_remove() and eventually vmbus_device_release()
727 */
728 device_unregister(&device_obj->device);
729
730 DPRINT_INFO(VMBUS_DRV, "child device (%p) unregistered",
731 &device_obj->device);
732 }
733
734 /*
735 * vmbus_uevent - add uevent for our device
736 *
737 * This routine is invoked when a device is added or removed on the vmbus to
738 * generate a uevent to udev in the userspace. The udev will then look at its
739 * rule and the uevent generated here to load the appropriate driver
740 */
741 static int vmbus_uevent(struct device *device, struct kobj_uevent_env *env)
742 {
743 struct hv_device *dev = device_to_hv_device(device);
744 int ret;
745
746 DPRINT_INFO(VMBUS_DRV, "generating uevent - VMBUS_DEVICE_CLASS_GUID={"
747 "%02x%02x%02x%02x-%02x%02x-%02x%02x-"
748 "%02x%02x%02x%02x%02x%02x%02x%02x}",
749 dev->dev_type.data[3], dev->dev_type.data[2],
750 dev->dev_type.data[1], dev->dev_type.data[0],
751 dev->dev_type.data[5], dev->dev_type.data[4],
752 dev->dev_type.data[7], dev->dev_type.data[6],
753 dev->dev_type.data[8], dev->dev_type.data[9],
754 dev->dev_type.data[10],
755 dev->dev_type.data[11],
756 dev->dev_type.data[12],
757 dev->dev_type.data[13],
758 dev->dev_type.data[14],
759 dev->dev_type.data[15]);
760
761 ret = add_uevent_var(env, "VMBUS_DEVICE_CLASS_GUID={"
762 "%02x%02x%02x%02x-%02x%02x-%02x%02x-"
763 "%02x%02x%02x%02x%02x%02x%02x%02x}",
764 dev->dev_type.data[3],
765 dev->dev_type.data[2],
766 dev->dev_type.data[1],
767 dev->dev_type.data[0],
768 dev->dev_type.data[5],
769 dev->dev_type.data[4],
770 dev->dev_type.data[7],
771 dev->dev_type.data[6],
772 dev->dev_type.data[8],
773 dev->dev_type.data[9],
774 dev->dev_type.data[10],
775 dev->dev_type.data[11],
776 dev->dev_type.data[12],
777 dev->dev_type.data[13],
778 dev->dev_type.data[14],
779 dev->dev_type.data[15]);
780
781 if (ret)
782 return ret;
783
784 ret = add_uevent_var(env, "VMBUS_DEVICE_DEVICE_GUID={"
785 "%02x%02x%02x%02x-%02x%02x-%02x%02x-"
786 "%02x%02x%02x%02x%02x%02x%02x%02x}",
787 dev->dev_instance.data[3],
788 dev->dev_instance.data[2],
789 dev->dev_instance.data[1],
790 dev->dev_instance.data[0],
791 dev->dev_instance.data[5],
792 dev->dev_instance.data[4],
793 dev->dev_instance.data[7],
794 dev->dev_instance.data[6],
795 dev->dev_instance.data[8],
796 dev->dev_instance.data[9],
797 dev->dev_instance.data[10],
798 dev->dev_instance.data[11],
799 dev->dev_instance.data[12],
800 dev->dev_instance.data[13],
801 dev->dev_instance.data[14],
802 dev->dev_instance.data[15]);
803 if (ret)
804 return ret;
805
806 return 0;
807 }
808
809 /*
810 * vmbus_match - Attempt to match the specified device to the specified driver
811 */
812 static int vmbus_match(struct device *device, struct device_driver *driver)
813 {
814 int match = 0;
815 struct hv_driver *drv = drv_to_hv_drv(driver);
816 struct hv_device *device_ctx = device_to_hv_device(device);
817
818 /* We found our driver ? */
819 if (memcmp(&device_ctx->dev_type, &drv->dev_type,
820 sizeof(struct hv_guid)) == 0) {
821
822 device_ctx->drv = drv->priv;
823 DPRINT_INFO(VMBUS_DRV,
824 "device object (%p) set to driver object (%p)",
825 &device_ctx,
826 device_ctx->drv);
827
828 match = 1;
829 }
830 return match;
831 }
832
833 /*
834 * vmbus_probe_failed_cb - Callback when a driver probe failed in vmbus_probe()
835 *
836 * We need a callback because we cannot invoked device_unregister() inside
837 * vmbus_probe() since vmbus_probe() may be invoked inside device_register()
838 * i.e. we cannot call device_unregister() inside device_register()
839 */
840 static void vmbus_probe_failed_cb(struct work_struct *context)
841 {
842 struct hv_device *device_ctx = (struct hv_device *)context;
843
844 /*
845 * Kick off the process of unregistering the device.
846 * This will call vmbus_remove() and eventually vmbus_device_release()
847 */
848 device_unregister(&device_ctx->device);
849
850 /* put_device(&device_ctx->device); */
851 }
852
853 /*
854 * vmbus_probe - Add the new vmbus's child device
855 */
856 static int vmbus_probe(struct device *child_device)
857 {
858 int ret = 0;
859 struct hv_driver *drv =
860 drv_to_hv_drv(child_device->driver);
861 struct hv_device *dev = device_to_hv_device(child_device);
862
863 /* Let the specific open-source driver handles the probe if it can */
864 if (drv->driver.probe) {
865 ret = dev->probe_error =
866 drv->driver.probe(child_device);
867 if (ret != 0) {
868 DPRINT_ERR(VMBUS_DRV, "probe() failed for device %s "
869 "(%p) on driver %s (%d)...",
870 dev_name(child_device), child_device,
871 child_device->driver->name, ret);
872
873 INIT_WORK(&dev->probe_failed_work_item,
874 vmbus_probe_failed_cb);
875 schedule_work(&dev->probe_failed_work_item);
876 }
877 } else {
878 DPRINT_ERR(VMBUS_DRV, "probe() method not set for driver - %s",
879 child_device->driver->name);
880 ret = -1;
881 }
882 return ret;
883 }
884
885 /*
886 * vmbus_remove - Remove a vmbus device
887 */
888 static int vmbus_remove(struct device *child_device)
889 {
890 int ret;
891 struct hv_driver *drv;
892
893 /* Special case root bus device */
894 if (child_device->parent == NULL) {
895 /*
896 * No-op since it is statically defined and handle in
897 * vmbus_bus_exit()
898 */
899 return 0;
900 }
901
902 if (child_device->driver) {
903 drv = drv_to_hv_drv(child_device->driver);
904
905 /*
906 * Let the specific open-source driver handles the removal if
907 * it can
908 */
909 if (drv->driver.remove) {
910 ret = drv->driver.remove(child_device);
911 } else {
912 DPRINT_ERR(VMBUS_DRV,
913 "remove() method not set for driver - %s",
914 child_device->driver->name);
915 ret = -1;
916 }
917 }
918
919 return 0;
920 }
921
922 /*
923 * vmbus_shutdown - Shutdown a vmbus device
924 */
925 static void vmbus_shutdown(struct device *child_device)
926 {
927 struct hv_driver *drv;
928
929 /* Special case root bus device */
930 if (child_device->parent == NULL) {
931 /*
932 * No-op since it is statically defined and handle in
933 * vmbus_bus_exit()
934 */
935 return;
936 }
937
938 /* The device may not be attached yet */
939 if (!child_device->driver)
940 return;
941
942 drv = drv_to_hv_drv(child_device->driver);
943
944 /* Let the specific open-source driver handles the removal if it can */
945 if (drv->driver.shutdown)
946 drv->driver.shutdown(child_device);
947
948 return;
949 }
950
951 /*
952 * vmbus_bus_release - Final callback release of the vmbus root device
953 */
954 static void vmbus_bus_release(struct device *device)
955 {
956 /* FIXME */
957 /* Empty release functions are a bug, or a major sign
958 * of a problem design, this MUST BE FIXED! */
959 dev_err(device, "%s needs to be fixed!\n", __func__);
960 WARN_ON(1);
961 }
962
963 /*
964 * vmbus_device_release - Final callback release of the vmbus child device
965 */
966 static void vmbus_device_release(struct device *device)
967 {
968 struct hv_device *device_ctx = device_to_hv_device(device);
969
970 kfree(device_ctx);
971
972 /* !!DO NOT REFERENCE device_ctx anymore at this point!! */
973 }
974
975
976
977 static irqreturn_t vmbus_isr(int irq, void *dev_id)
978 {
979 int ret;
980
981 ret = vmbus_on_isr();
982
983 /* Schedules a dpc if necessary */
984 if (ret > 0) {
985 if (test_bit(0, (unsigned long *)&ret))
986 tasklet_schedule(&vmbus_drv.msg_dpc);
987
988 if (test_bit(1, (unsigned long *)&ret))
989 tasklet_schedule(&vmbus_drv.event_dpc);
990
991 return IRQ_HANDLED;
992 } else {
993 return IRQ_NONE;
994 }
995 }
996
997 static struct dmi_system_id __initdata microsoft_hv_dmi_table[] = {
998 {
999 .ident = "Hyper-V",
1000 .matches = {
1001 DMI_MATCH(DMI_SYS_VENDOR, "Microsoft Corporation"),
1002 DMI_MATCH(DMI_PRODUCT_NAME, "Virtual Machine"),
1003 DMI_MATCH(DMI_BOARD_NAME, "Virtual Machine"),
1004 },
1005 },
1006 { },
1007 };
1008 MODULE_DEVICE_TABLE(dmi, microsoft_hv_dmi_table);
1009
1010 static int __init vmbus_init(void)
1011 {
1012 DPRINT_INFO(VMBUS_DRV,
1013 "Vmbus initializing.... current log level 0x%x (%x,%x)",
1014 vmbus_loglevel, HIWORD(vmbus_loglevel), LOWORD(vmbus_loglevel));
1015 /* Todo: it is used for loglevel, to be ported to new kernel. */
1016
1017 if (!dmi_check_system(microsoft_hv_dmi_table))
1018 return -ENODEV;
1019
1020 return vmbus_bus_init();
1021 }
1022
1023 static void __exit vmbus_exit(void)
1024 {
1025 vmbus_bus_exit();
1026 /* Todo: it is used for loglevel, to be ported to new kernel. */
1027 }
1028
1029 /*
1030 * We use a PCI table to determine if we should autoload this driver This is
1031 * needed by distro tools to determine if the hyperv drivers should be
1032 * installed and/or configured. We don't do anything else with the table, but
1033 * it needs to be present.
1034 */
1035 static const struct pci_device_id microsoft_hv_pci_table[] = {
1036 { PCI_DEVICE(0x1414, 0x5353) }, /* VGA compatible controller */
1037 { 0 }
1038 };
1039 MODULE_DEVICE_TABLE(pci, microsoft_hv_pci_table);
1040
1041 MODULE_LICENSE("GPL");
1042 MODULE_VERSION(HV_DRV_VERSION);
1043 module_param(vmbus_irq, int, S_IRUGO);
1044 module_param(vmbus_loglevel, int, S_IRUGO);
1045
1046 module_init(vmbus_init);
1047 module_exit(vmbus_exit);
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree