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MIPS: IP27: Fix GCC 4.6.0 build error.
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / drivers / staging / hv / vmbus_drv.c
blob79089f85d903a1ca4caa170346b00ac607eacdea
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 /*
144 * vmbus_dev_add - Callback when the root bus device is added
145 */
146 static int vmbus_dev_add(struct hv_device *dev, void *info)
147 {
148 u32 *irqvector = info;
149 int ret;
150
151 vmbus_device = dev;
152
153 memcpy(&vmbus_device->dev_type, &device_type, sizeof(struct hv_guid));
154 memcpy(&vmbus_device->dev_instance, &device_id,
155 sizeof(struct hv_guid));
156
157 /* strcpy(dev->name, "vmbus"); */
158 /* SynIC setup... */
159 on_each_cpu(hv_synic_init, (void *)irqvector, 1);
160
161 /* Connect to VMBus in the root partition */
162 ret = vmbus_connect();
163
164 /* VmbusSendEvent(device->localPortId+1); */
165 return ret;
166 }
167
168
169 struct onmessage_work_context {
170 struct work_struct work;
171 struct hv_message msg;
172 };
173
174 static void vmbus_onmessage_work(struct work_struct *work)
175 {
176 struct onmessage_work_context *ctx;
177
178 ctx = container_of(work, struct onmessage_work_context,
179 work);
180 vmbus_onmessage(&ctx->msg);
181 kfree(ctx);
182 }
183
184 /*
185 * vmbus_on_msg_dpc - DPC routine to handle messages from the hypervisior
186 */
187 static void vmbus_on_msg_dpc(unsigned long data)
188 {
189 int cpu = smp_processor_id();
190 void *page_addr = hv_context.synic_message_page[cpu];
191 struct hv_message *msg = (struct hv_message *)page_addr +
192 VMBUS_MESSAGE_SINT;
193 struct onmessage_work_context *ctx;
194
195 while (1) {
196 if (msg->header.message_type == HVMSG_NONE) {
197 /* no msg */
198 break;
199 } else {
200 ctx = kmalloc(sizeof(*ctx), GFP_ATOMIC);
201 if (ctx == NULL)
202 continue;
203 INIT_WORK(&ctx->work, vmbus_onmessage_work);
204 memcpy(&ctx->msg, msg, sizeof(*msg));
205 queue_work(vmbus_connection.work_queue, &ctx->work);
206 }
207
208 msg->header.message_type = HVMSG_NONE;
209
210 /*
211 * Make sure the write to MessageType (ie set to
212 * HVMSG_NONE) happens before we read the
213 * MessagePending and EOMing. Otherwise, the EOMing
214 * will not deliver any more messages since there is
215 * no empty slot
216 */
217 mb();
218
219 if (msg->header.message_flags.msg_pending) {
220 /*
221 * This will cause message queue rescan to
222 * possibly deliver another msg from the
223 * hypervisor
224 */
225 wrmsrl(HV_X64_MSR_EOM, 0);
226 }
227 }
228 }
229
230 /*
231 * vmbus_on_isr - ISR routine
232 */
233 static int vmbus_on_isr(void)
234 {
235 int ret = 0;
236 int cpu = smp_processor_id();
237 void *page_addr;
238 struct hv_message *msg;
239 union hv_synic_event_flags *event;
240
241 page_addr = hv_context.synic_message_page[cpu];
242 msg = (struct hv_message *)page_addr + VMBUS_MESSAGE_SINT;
243
244 /* Check if there are actual msgs to be process */
245 if (msg->header.message_type != HVMSG_NONE) {
246 DPRINT_DBG(VMBUS, "received msg type %d size %d",
247 msg->header.message_type,
248 msg->header.payload_size);
249 ret |= 0x1;
250 }
251
252 /* TODO: Check if there are events to be process */
253 page_addr = hv_context.synic_event_page[cpu];
254 event = (union hv_synic_event_flags *)page_addr + VMBUS_MESSAGE_SINT;
255
256 /* Since we are a child, we only need to check bit 0 */
257 if (sync_test_and_clear_bit(0, (unsigned long *) &event->flags32[0])) {
258 DPRINT_DBG(VMBUS, "received event %d", event->flags32[0]);
259 ret |= 0x2;
260 }
261
262 return ret;
263 }
264
265 static void get_channel_info(struct hv_device *device,
266 struct hv_device_info *info)
267 {
268 struct vmbus_channel_debug_info debug_info;
269
270 if (!device->channel)
271 return;
272
273 vmbus_get_debug_info(device->channel, &debug_info);
274
275 info->chn_id = debug_info.relid;
276 info->chn_state = debug_info.state;
277 memcpy(&info->chn_type, &debug_info.interfacetype,
278 sizeof(struct hv_guid));
279 memcpy(&info->chn_instance, &debug_info.interface_instance,
280 sizeof(struct hv_guid));
281
282 info->monitor_id = debug_info.monitorid;
283
284 info->server_monitor_pending = debug_info.servermonitor_pending;
285 info->server_monitor_latency = debug_info.servermonitor_latency;
286 info->server_monitor_conn_id = debug_info.servermonitor_connectionid;
287
288 info->client_monitor_pending = debug_info.clientmonitor_pending;
289 info->client_monitor_latency = debug_info.clientmonitor_latency;
290 info->client_monitor_conn_id = debug_info.clientmonitor_connectionid;
291
292 info->inbound.int_mask = debug_info.inbound.current_interrupt_mask;
293 info->inbound.read_idx = debug_info.inbound.current_read_index;
294 info->inbound.write_idx = debug_info.inbound.current_write_index;
295 info->inbound.bytes_avail_toread =
296 debug_info.inbound.bytes_avail_toread;
297 info->inbound.bytes_avail_towrite =
298 debug_info.inbound.bytes_avail_towrite;
299
300 info->outbound.int_mask =
301 debug_info.outbound.current_interrupt_mask;
302 info->outbound.read_idx = debug_info.outbound.current_read_index;
303 info->outbound.write_idx = debug_info.outbound.current_write_index;
304 info->outbound.bytes_avail_toread =
305 debug_info.outbound.bytes_avail_toread;
306 info->outbound.bytes_avail_towrite =
307 debug_info.outbound.bytes_avail_towrite;
308 }
309
310 /*
311 * vmbus_show_device_attr - Show the device attribute in sysfs.
312 *
313 * This is invoked when user does a
314 * "cat /sys/bus/vmbus/devices/<busdevice>/<attr name>"
315 */
316 static ssize_t vmbus_show_device_attr(struct device *dev,
317 struct device_attribute *dev_attr,
318 char *buf)
319 {
320 struct hv_device *device_ctx = device_to_hv_device(dev);
321 struct hv_device_info device_info;
322
323 memset(&device_info, 0, sizeof(struct hv_device_info));
324
325 get_channel_info(device_ctx, &device_info);
326
327 if (!strcmp(dev_attr->attr.name, "class_id")) {
328 return sprintf(buf, "{%02x%02x%02x%02x-%02x%02x-%02x%02x-"
329 "%02x%02x%02x%02x%02x%02x%02x%02x}\n",
330 device_info.chn_type.data[3],
331 device_info.chn_type.data[2],
332 device_info.chn_type.data[1],
333 device_info.chn_type.data[0],
334 device_info.chn_type.data[5],
335 device_info.chn_type.data[4],
336 device_info.chn_type.data[7],
337 device_info.chn_type.data[6],
338 device_info.chn_type.data[8],
339 device_info.chn_type.data[9],
340 device_info.chn_type.data[10],
341 device_info.chn_type.data[11],
342 device_info.chn_type.data[12],
343 device_info.chn_type.data[13],
344 device_info.chn_type.data[14],
345 device_info.chn_type.data[15]);
346 } else if (!strcmp(dev_attr->attr.name, "device_id")) {
347 return sprintf(buf, "{%02x%02x%02x%02x-%02x%02x-%02x%02x-"
348 "%02x%02x%02x%02x%02x%02x%02x%02x}\n",
349 device_info.chn_instance.data[3],
350 device_info.chn_instance.data[2],
351 device_info.chn_instance.data[1],
352 device_info.chn_instance.data[0],
353 device_info.chn_instance.data[5],
354 device_info.chn_instance.data[4],
355 device_info.chn_instance.data[7],
356 device_info.chn_instance.data[6],
357 device_info.chn_instance.data[8],
358 device_info.chn_instance.data[9],
359 device_info.chn_instance.data[10],
360 device_info.chn_instance.data[11],
361 device_info.chn_instance.data[12],
362 device_info.chn_instance.data[13],
363 device_info.chn_instance.data[14],
364 device_info.chn_instance.data[15]);
365 } else if (!strcmp(dev_attr->attr.name, "state")) {
366 return sprintf(buf, "%d\n", device_info.chn_state);
367 } else if (!strcmp(dev_attr->attr.name, "id")) {
368 return sprintf(buf, "%d\n", device_info.chn_id);
369 } else if (!strcmp(dev_attr->attr.name, "out_intr_mask")) {
370 return sprintf(buf, "%d\n", device_info.outbound.int_mask);
371 } else if (!strcmp(dev_attr->attr.name, "out_read_index")) {
372 return sprintf(buf, "%d\n", device_info.outbound.read_idx);
373 } else if (!strcmp(dev_attr->attr.name, "out_write_index")) {
374 return sprintf(buf, "%d\n", device_info.outbound.write_idx);
375 } else if (!strcmp(dev_attr->attr.name, "out_read_bytes_avail")) {
376 return sprintf(buf, "%d\n",
377 device_info.outbound.bytes_avail_toread);
378 } else if (!strcmp(dev_attr->attr.name, "out_write_bytes_avail")) {
379 return sprintf(buf, "%d\n",
380 device_info.outbound.bytes_avail_towrite);
381 } else if (!strcmp(dev_attr->attr.name, "in_intr_mask")) {
382 return sprintf(buf, "%d\n", device_info.inbound.int_mask);
383 } else if (!strcmp(dev_attr->attr.name, "in_read_index")) {
384 return sprintf(buf, "%d\n", device_info.inbound.read_idx);
385 } else if (!strcmp(dev_attr->attr.name, "in_write_index")) {
386 return sprintf(buf, "%d\n", device_info.inbound.write_idx);
387 } else if (!strcmp(dev_attr->attr.name, "in_read_bytes_avail")) {
388 return sprintf(buf, "%d\n",
389 device_info.inbound.bytes_avail_toread);
390 } else if (!strcmp(dev_attr->attr.name, "in_write_bytes_avail")) {
391 return sprintf(buf, "%d\n",
392 device_info.inbound.bytes_avail_towrite);
393 } else if (!strcmp(dev_attr->attr.name, "monitor_id")) {
394 return sprintf(buf, "%d\n", device_info.monitor_id);
395 } else if (!strcmp(dev_attr->attr.name, "server_monitor_pending")) {
396 return sprintf(buf, "%d\n", device_info.server_monitor_pending);
397 } else if (!strcmp(dev_attr->attr.name, "server_monitor_latency")) {
398 return sprintf(buf, "%d\n", device_info.server_monitor_latency);
399 } else if (!strcmp(dev_attr->attr.name, "server_monitor_conn_id")) {
400 return sprintf(buf, "%d\n",
401 device_info.server_monitor_conn_id);
402 } else if (!strcmp(dev_attr->attr.name, "client_monitor_pending")) {
403 return sprintf(buf, "%d\n", device_info.client_monitor_pending);
404 } else if (!strcmp(dev_attr->attr.name, "client_monitor_latency")) {
405 return sprintf(buf, "%d\n", device_info.client_monitor_latency);
406 } else if (!strcmp(dev_attr->attr.name, "client_monitor_conn_id")) {
407 return sprintf(buf, "%d\n",
408 device_info.client_monitor_conn_id);
409 } else {
410 return 0;
411 }
412 }
413
414 /*
415 * vmbus_bus_init -Main vmbus driver initialization routine.
416 *
417 * Here, we
418 * - initialize the vmbus driver context
419 * - setup various driver entry points
420 * - invoke the vmbus hv main init routine
421 * - get the irq resource
422 * - invoke the vmbus to add the vmbus root device
423 * - setup the vmbus root device
424 * - retrieve the channel offers
425 */
426 static int vmbus_bus_init(void)
427 {
428 struct vmbus_driver_context *vmbus_drv_ctx = &vmbus_drv;
429 struct hv_device *dev_ctx = &vmbus_drv.device_ctx;
430 int ret;
431 unsigned int vector;
432
433 DPRINT_INFO(VMBUS, "+++++++ HV Driver version = %s +++++++",
434 HV_DRV_VERSION);
435 DPRINT_INFO(VMBUS, "+++++++ Vmbus supported version = %d +++++++",
436 VMBUS_REVISION_NUMBER);
437 DPRINT_INFO(VMBUS, "+++++++ Vmbus using SINT %d +++++++",
438 VMBUS_MESSAGE_SINT);
439 DPRINT_DBG(VMBUS, "sizeof(vmbus_channel_packet_page_buffer)=%zd, "
440 "sizeof(VMBUS_CHANNEL_PACKET_MULITPAGE_BUFFER)=%zd",
441 sizeof(struct vmbus_channel_packet_page_buffer),
442 sizeof(struct vmbus_channel_packet_multipage_buffer));
443
444
445 /* Hypervisor initialization...setup hypercall page..etc */
446 ret = hv_init();
447 if (ret != 0) {
448 DPRINT_ERR(VMBUS, "Unable to initialize the hypervisor - 0x%x",
449 ret);
450 goto cleanup;
451 }
452
453
454 vmbus_drv_ctx->bus.name = driver_name;
455
456 /* Initialize the bus context */
457 tasklet_init(&vmbus_drv_ctx->msg_dpc, vmbus_on_msg_dpc,
458 (unsigned long)NULL);
459 tasklet_init(&vmbus_drv_ctx->event_dpc, vmbus_on_event,
460 (unsigned long)NULL);
461
462 /* Now, register the bus with LDM */
463 ret = bus_register(&vmbus_drv_ctx->bus);
464 if (ret) {
465 ret = -1;
466 goto cleanup;
467 }
468
469 /* Get the interrupt resource */
470 ret = request_irq(vmbus_irq, vmbus_isr, IRQF_SAMPLE_RANDOM,
471 driver_name, NULL);
472
473 if (ret != 0) {
474 DPRINT_ERR(VMBUS_DRV, "ERROR - Unable to request IRQ %d",
475 vmbus_irq);
476
477 bus_unregister(&vmbus_drv_ctx->bus);
478
479 ret = -1;
480 goto cleanup;
481 }
482 vector = VMBUS_IRQ_VECTOR;
483
484 DPRINT_INFO(VMBUS_DRV, "irq 0x%x vector 0x%x", vmbus_irq, vector);
485
486 /* Add the root device */
487 memset(dev_ctx, 0, sizeof(struct hv_device));
488
489 ret = vmbus_dev_add(dev_ctx, &vector);
490 if (ret != 0) {
491 DPRINT_ERR(VMBUS_DRV,
492 "ERROR - Unable to add vmbus root device");
493
494 free_irq(vmbus_irq, NULL);
495
496 bus_unregister(&vmbus_drv_ctx->bus);
497
498 ret = -1;
499 goto cleanup;
500 }
501 /* strcpy(dev_ctx->device.bus_id, dev_ctx->device_obj.name); */
502 dev_set_name(&dev_ctx->device, "vmbus_0_0");
503
504 /* No need to bind a driver to the root device. */
505 dev_ctx->device.parent = NULL;
506 /* NULL; vmbus_remove() does not get invoked */
507 dev_ctx->device.bus = &vmbus_drv_ctx->bus;
508
509 /* Setup the device dispatch table */
510 dev_ctx->device.release = vmbus_bus_release;
511
512 /* register the root device */
513 ret = device_register(&dev_ctx->device);
514 if (ret) {
515 DPRINT_ERR(VMBUS_DRV,
516 "ERROR - Unable to register vmbus root device");
517
518 free_irq(vmbus_irq, NULL);
519 bus_unregister(&vmbus_drv_ctx->bus);
520
521 ret = -1;
522 goto cleanup;
523 }
524
525 vmbus_request_offers();
526 wait_for_completion(&hv_channel_ready);
527
528 cleanup:
529 return ret;
530 }
531
532 /*
533 * vmbus_bus_exit - Terminate the vmbus driver.
534 *
535 * This routine is opposite of vmbus_bus_init()
536 */
537 static void vmbus_bus_exit(void)
538 {
539 struct vmbus_driver_context *vmbus_drv_ctx = &vmbus_drv;
540
541 struct hv_device *dev_ctx = &vmbus_drv.device_ctx;
542
543 vmbus_release_unattached_channels();
544 vmbus_disconnect();
545 on_each_cpu(hv_synic_cleanup, NULL, 1);
546
547 hv_cleanup();
548
549 /* Unregister the root bus device */
550 device_unregister(&dev_ctx->device);
551
552 bus_unregister(&vmbus_drv_ctx->bus);
553
554 free_irq(vmbus_irq, NULL);
555
556 tasklet_kill(&vmbus_drv_ctx->msg_dpc);
557 tasklet_kill(&vmbus_drv_ctx->event_dpc);
558 }
559
560
561 /**
562 * vmbus_child_driver_register() - Register a vmbus's child driver
563 * @drv: Pointer to driver structure you want to register
564 *
565 *
566 * Registers the given driver with Linux through the 'driver_register()' call
567 * And sets up the hyper-v vmbus handling for this driver.
568 * It will return the state of the 'driver_register()' call.
569 *
570 * Mainly used by Hyper-V drivers.
571 */
572 int vmbus_child_driver_register(struct device_driver *drv)
573 {
574 int ret;
575
576 DPRINT_INFO(VMBUS_DRV, "child driver (%p) registering - name %s",
577 drv, drv->name);
578
579 /* The child driver on this vmbus */
580 drv->bus = &vmbus_drv.bus;
581
582 ret = driver_register(drv);
583
584 vmbus_request_offers();
585
586 return ret;
587 }
588 EXPORT_SYMBOL(vmbus_child_driver_register);
589
590 /**
591 * vmbus_child_driver_unregister() - Unregister a vmbus's child driver
592 * @drv: Pointer to driver structure you want to un-register
593 *
594 *
595 * Un-register the given driver with Linux through the 'driver_unregister()'
596 * call. And ungegisters the driver from the Hyper-V vmbus handler.
597 *
598 * Mainly used by Hyper-V drivers.
599 */
600 void vmbus_child_driver_unregister(struct device_driver *drv)
601 {
602 DPRINT_INFO(VMBUS_DRV, "child driver (%p) unregistering - name %s",
603 drv, drv->name);
604
605 driver_unregister(drv);
606
607 drv->bus = NULL;
608 }
609 EXPORT_SYMBOL(vmbus_child_driver_unregister);
610
611 /*
612 * vmbus_child_device_create - Creates and registers a new child device
613 * on the vmbus.
614 */
615 struct hv_device *vmbus_child_device_create(struct hv_guid *type,
616 struct hv_guid *instance,
617 struct vmbus_channel *channel)
618 {
619 struct hv_device *child_device_obj;
620
621 /* Allocate the new child device */
622 child_device_obj = kzalloc(sizeof(struct hv_device), GFP_KERNEL);
623 if (!child_device_obj) {
624 DPRINT_ERR(VMBUS_DRV,
625 "unable to allocate device_context for child device");
626 return NULL;
627 }
628
629 DPRINT_DBG(VMBUS_DRV, "child device (%p) allocated - "
630 "type {%02x%02x%02x%02x-%02x%02x-%02x%02x-"
631 "%02x%02x%02x%02x%02x%02x%02x%02x},"
632 "id {%02x%02x%02x%02x-%02x%02x-%02x%02x-"
633 "%02x%02x%02x%02x%02x%02x%02x%02x}",
634 &child_device_obj->device,
635 type->data[3], type->data[2], type->data[1], type->data[0],
636 type->data[5], type->data[4], type->data[7], type->data[6],
637 type->data[8], type->data[9], type->data[10], type->data[11],
638 type->data[12], type->data[13], type->data[14], type->data[15],
639 instance->data[3], instance->data[2],
640 instance->data[1], instance->data[0],
641 instance->data[5], instance->data[4],
642 instance->data[7], instance->data[6],
643 instance->data[8], instance->data[9],
644 instance->data[10], instance->data[11],
645 instance->data[12], instance->data[13],
646 instance->data[14], instance->data[15]);
647
648 child_device_obj->channel = channel;
649 memcpy(&child_device_obj->dev_type, type, sizeof(struct hv_guid));
650 memcpy(&child_device_obj->dev_instance, instance,
651 sizeof(struct hv_guid));
652
653
654 return child_device_obj;
655 }
656
657 /*
658 * vmbus_child_device_register - Register the child device
659 */
660 int vmbus_child_device_register(struct hv_device *child_device_obj)
661 {
662 int ret = 0;
663
664 static atomic_t device_num = ATOMIC_INIT(0);
665
666 DPRINT_DBG(VMBUS_DRV, "child device (%p) registering",
667 child_device_obj);
668
669 /* Set the device name. Otherwise, device_register() will fail. */
670 dev_set_name(&child_device_obj->device, "vmbus_0_%d",
671 atomic_inc_return(&device_num));
672
673 /* The new device belongs to this bus */
674 child_device_obj->device.bus = &vmbus_drv.bus; /* device->dev.bus; */
675 child_device_obj->device.parent = &vmbus_device->device;
676 child_device_obj->device.release = vmbus_device_release;
677
678 /*
679 * Register with the LDM. This will kick off the driver/device
680 * binding...which will eventually call vmbus_match() and vmbus_probe()
681 */
682 ret = device_register(&child_device_obj->device);
683
684 /* vmbus_probe() error does not get propergate to device_register(). */
685 ret = child_device_obj->probe_error;
686
687 if (ret)
688 DPRINT_ERR(VMBUS_DRV, "unable to register child device (%p)",
689 &child_device_obj->device);
690 else
691 DPRINT_INFO(VMBUS_DRV, "child device (%p) registered",
692 &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 DPRINT_INFO(VMBUS_DRV, "unregistering child device (%p)",
705 &device_obj->device);
706
707 /*
708 * Kick off the process of unregistering the device.
709 * This will call vmbus_remove() and eventually vmbus_device_release()
710 */
711 device_unregister(&device_obj->device);
712
713 DPRINT_INFO(VMBUS_DRV, "child device (%p) unregistered",
714 &device_obj->device);
715 }
716
717 /*
718 * vmbus_uevent - add uevent for our device
719 *
720 * This routine is invoked when a device is added or removed on the vmbus to
721 * generate a uevent to udev in the userspace. The udev will then look at its
722 * rule and the uevent generated here to load the appropriate driver
723 */
724 static int vmbus_uevent(struct device *device, struct kobj_uevent_env *env)
725 {
726 struct hv_device *dev = device_to_hv_device(device);
727 int ret;
728
729 DPRINT_INFO(VMBUS_DRV, "generating uevent - VMBUS_DEVICE_CLASS_GUID={"
730 "%02x%02x%02x%02x-%02x%02x-%02x%02x-"
731 "%02x%02x%02x%02x%02x%02x%02x%02x}",
732 dev->dev_type.data[3], dev->dev_type.data[2],
733 dev->dev_type.data[1], dev->dev_type.data[0],
734 dev->dev_type.data[5], dev->dev_type.data[4],
735 dev->dev_type.data[7], dev->dev_type.data[6],
736 dev->dev_type.data[8], dev->dev_type.data[9],
737 dev->dev_type.data[10],
738 dev->dev_type.data[11],
739 dev->dev_type.data[12],
740 dev->dev_type.data[13],
741 dev->dev_type.data[14],
742 dev->dev_type.data[15]);
743
744 ret = add_uevent_var(env, "VMBUS_DEVICE_CLASS_GUID={"
745 "%02x%02x%02x%02x-%02x%02x-%02x%02x-"
746 "%02x%02x%02x%02x%02x%02x%02x%02x}",
747 dev->dev_type.data[3],
748 dev->dev_type.data[2],
749 dev->dev_type.data[1],
750 dev->dev_type.data[0],
751 dev->dev_type.data[5],
752 dev->dev_type.data[4],
753 dev->dev_type.data[7],
754 dev->dev_type.data[6],
755 dev->dev_type.data[8],
756 dev->dev_type.data[9],
757 dev->dev_type.data[10],
758 dev->dev_type.data[11],
759 dev->dev_type.data[12],
760 dev->dev_type.data[13],
761 dev->dev_type.data[14],
762 dev->dev_type.data[15]);
763
764 if (ret)
765 return ret;
766
767 ret = add_uevent_var(env, "VMBUS_DEVICE_DEVICE_GUID={"
768 "%02x%02x%02x%02x-%02x%02x-%02x%02x-"
769 "%02x%02x%02x%02x%02x%02x%02x%02x}",
770 dev->dev_instance.data[3],
771 dev->dev_instance.data[2],
772 dev->dev_instance.data[1],
773 dev->dev_instance.data[0],
774 dev->dev_instance.data[5],
775 dev->dev_instance.data[4],
776 dev->dev_instance.data[7],
777 dev->dev_instance.data[6],
778 dev->dev_instance.data[8],
779 dev->dev_instance.data[9],
780 dev->dev_instance.data[10],
781 dev->dev_instance.data[11],
782 dev->dev_instance.data[12],
783 dev->dev_instance.data[13],
784 dev->dev_instance.data[14],
785 dev->dev_instance.data[15]);
786 if (ret)
787 return ret;
788
789 return 0;
790 }
791
792 /*
793 * vmbus_match - Attempt to match the specified device to the specified driver
794 */
795 static int vmbus_match(struct device *device, struct device_driver *driver)
796 {
797 int match = 0;
798 struct hv_driver *drv = drv_to_hv_drv(driver);
799 struct hv_device *device_ctx = device_to_hv_device(device);
800
801 /* We found our driver ? */
802 if (memcmp(&device_ctx->dev_type, &drv->dev_type,
803 sizeof(struct hv_guid)) == 0) {
804
805 device_ctx->drv = drv->priv;
806 DPRINT_INFO(VMBUS_DRV,
807 "device object (%p) set to driver object (%p)",
808 &device_ctx,
809 device_ctx->drv);
810
811 match = 1;
812 }
813 return match;
814 }
815
816 /*
817 * vmbus_probe_failed_cb - Callback when a driver probe failed in vmbus_probe()
818 *
819 * We need a callback because we cannot invoked device_unregister() inside
820 * vmbus_probe() since vmbus_probe() may be invoked inside device_register()
821 * i.e. we cannot call device_unregister() inside device_register()
822 */
823 static void vmbus_probe_failed_cb(struct work_struct *context)
824 {
825 struct hv_device *device_ctx = (struct hv_device *)context;
826
827 /*
828 * Kick off the process of unregistering the device.
829 * This will call vmbus_remove() and eventually vmbus_device_release()
830 */
831 device_unregister(&device_ctx->device);
832
833 /* put_device(&device_ctx->device); */
834 }
835
836 /*
837 * vmbus_probe - Add the new vmbus's child device
838 */
839 static int vmbus_probe(struct device *child_device)
840 {
841 int ret = 0;
842 struct hv_driver *drv =
843 drv_to_hv_drv(child_device->driver);
844 struct hv_device *dev = device_to_hv_device(child_device);
845
846 /* Let the specific open-source driver handles the probe if it can */
847 if (drv->driver.probe) {
848 ret = dev->probe_error =
849 drv->driver.probe(child_device);
850 if (ret != 0) {
851 DPRINT_ERR(VMBUS_DRV, "probe() failed for device %s "
852 "(%p) on driver %s (%d)...",
853 dev_name(child_device), child_device,
854 child_device->driver->name, ret);
855
856 INIT_WORK(&dev->probe_failed_work_item,
857 vmbus_probe_failed_cb);
858 schedule_work(&dev->probe_failed_work_item);
859 }
860 } else {
861 DPRINT_ERR(VMBUS_DRV, "probe() method not set for driver - %s",
862 child_device->driver->name);
863 ret = -1;
864 }
865 return ret;
866 }
867
868 /*
869 * vmbus_remove - Remove a vmbus device
870 */
871 static int vmbus_remove(struct device *child_device)
872 {
873 int ret;
874 struct hv_driver *drv;
875
876 /* Special case root bus device */
877 if (child_device->parent == NULL) {
878 /*
879 * No-op since it is statically defined and handle in
880 * vmbus_bus_exit()
881 */
882 return 0;
883 }
884
885 if (child_device->driver) {
886 drv = drv_to_hv_drv(child_device->driver);
887
888 /*
889 * Let the specific open-source driver handles the removal if
890 * it can
891 */
892 if (drv->driver.remove) {
893 ret = drv->driver.remove(child_device);
894 } else {
895 DPRINT_ERR(VMBUS_DRV,
896 "remove() method not set for driver - %s",
897 child_device->driver->name);
898 ret = -1;
899 }
900 }
901
902 return 0;
903 }
904
905 /*
906 * vmbus_shutdown - Shutdown a vmbus device
907 */
908 static void vmbus_shutdown(struct device *child_device)
909 {
910 struct hv_driver *drv;
911
912 /* Special case root bus device */
913 if (child_device->parent == NULL) {
914 /*
915 * No-op since it is statically defined and handle in
916 * vmbus_bus_exit()
917 */
918 return;
919 }
920
921 /* The device may not be attached yet */
922 if (!child_device->driver)
923 return;
924
925 drv = drv_to_hv_drv(child_device->driver);
926
927 /* Let the specific open-source driver handles the removal if it can */
928 if (drv->driver.shutdown)
929 drv->driver.shutdown(child_device);
930
931 return;
932 }
933
934 /*
935 * vmbus_bus_release - Final callback release of the vmbus root device
936 */
937 static void vmbus_bus_release(struct device *device)
938 {
939 /* FIXME */
940 /* Empty release functions are a bug, or a major sign
941 * of a problem design, this MUST BE FIXED! */
942 dev_err(device, "%s needs to be fixed!\n", __func__);
943 WARN_ON(1);
944 }
945
946 /*
947 * vmbus_device_release - Final callback release of the vmbus child device
948 */
949 static void vmbus_device_release(struct device *device)
950 {
951 struct hv_device *device_ctx = device_to_hv_device(device);
952
953 kfree(device_ctx);
954
955 /* !!DO NOT REFERENCE device_ctx anymore at this point!! */
956 }
957
958
959
960 static irqreturn_t vmbus_isr(int irq, void *dev_id)
961 {
962 int ret;
963
964 ret = vmbus_on_isr();
965
966 /* Schedules a dpc if necessary */
967 if (ret > 0) {
968 if (test_bit(0, (unsigned long *)&ret))
969 tasklet_schedule(&vmbus_drv.msg_dpc);
970
971 if (test_bit(1, (unsigned long *)&ret))
972 tasklet_schedule(&vmbus_drv.event_dpc);
973
974 return IRQ_HANDLED;
975 } else {
976 return IRQ_NONE;
977 }
978 }
979
980 static struct dmi_system_id __initdata microsoft_hv_dmi_table[] = {
981 {
982 .ident = "Hyper-V",
983 .matches = {
984 DMI_MATCH(DMI_SYS_VENDOR, "Microsoft Corporation"),
985 DMI_MATCH(DMI_PRODUCT_NAME, "Virtual Machine"),
986 DMI_MATCH(DMI_BOARD_NAME, "Virtual Machine"),
987 },
988 },
989 { },
990 };
991 MODULE_DEVICE_TABLE(dmi, microsoft_hv_dmi_table);
992
993 static int __init vmbus_init(void)
994 {
995 DPRINT_INFO(VMBUS_DRV,
996 "Vmbus initializing.... current log level 0x%x (%x,%x)",
997 vmbus_loglevel, HIWORD(vmbus_loglevel), LOWORD(vmbus_loglevel));
998 /* Todo: it is used for loglevel, to be ported to new kernel. */
999
1000 if (!dmi_check_system(microsoft_hv_dmi_table))
1001 return -ENODEV;
1002
1003 return vmbus_bus_init();
1004 }
1005
1006 static void __exit vmbus_exit(void)
1007 {
1008 vmbus_bus_exit();
1009 /* Todo: it is used for loglevel, to be ported to new kernel. */
1010 }
1011
1012 /*
1013 * We use a PCI table to determine if we should autoload this driver This is
1014 * needed by distro tools to determine if the hyperv drivers should be
1015 * installed and/or configured. We don't do anything else with the table, but
1016 * it needs to be present.
1017 */
1018 static const struct pci_device_id microsoft_hv_pci_table[] = {
1019 { PCI_DEVICE(0x1414, 0x5353) }, /* VGA compatible controller */
1020 { 0 }
1021 };
1022 MODULE_DEVICE_TABLE(pci, microsoft_hv_pci_table);
1023
1024 MODULE_LICENSE("GPL");
1025 MODULE_VERSION(HV_DRV_VERSION);
1026 module_param(vmbus_irq, int, S_IRUGO);
1027 module_param(vmbus_loglevel, int, S_IRUGO);
1028
1029 module_init(vmbus_init);
1030 module_exit(vmbus_exit);
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree