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staging: hv: Convert camel cased struct fields in vmbus_private.h to lower cases
[deliverable/linux.git] / drivers / staging / hv / vmbus_drv.c
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 "osd.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 /* !! These must be the first 2 fields !! */
46 /* FIXME, this is a bug */
47 /* The driver field is not used in here. Instead, the bus field is */
48 /* used to represent the driver */
49 struct driver_context drv_ctx;
50 struct hv_driver drv_obj;
51
52 struct bus_type bus;
53 struct tasklet_struct msg_dpc;
54 struct tasklet_struct event_dpc;
55
56 /* The bus root device */
57 struct vm_device device_ctx;
58 };
59
60 static int vmbus_match(struct device *device, struct device_driver *driver);
61 static int vmbus_probe(struct device *device);
62 static int vmbus_remove(struct device *device);
63 static void vmbus_shutdown(struct device *device);
64 static int vmbus_uevent(struct device *device, struct kobj_uevent_env *env);
65 static void vmbus_msg_dpc(unsigned long data);
66 static void vmbus_event_dpc(unsigned long data);
67
68 static irqreturn_t vmbus_isr(int irq, void *dev_id);
69
70 static void vmbus_device_release(struct device *device);
71 static void vmbus_bus_release(struct device *device);
72
73 static ssize_t vmbus_show_device_attr(struct device *dev,
74 struct device_attribute *dev_attr,
75 char *buf);
76
77
78 unsigned int vmbus_loglevel = (ALL_MODULES << 16 | INFO_LVL);
79 EXPORT_SYMBOL(vmbus_loglevel);
80 /* (ALL_MODULES << 16 | DEBUG_LVL_ENTEREXIT); */
81 /* (((VMBUS | VMBUS_DRV)<<16) | DEBUG_LVL_ENTEREXIT); */
82
83 static int vmbus_irq = VMBUS_IRQ;
84
85 /* Set up per device attributes in /sys/bus/vmbus/devices/<bus device> */
86 static struct device_attribute vmbus_device_attrs[] = {
87 __ATTR(id, S_IRUGO, vmbus_show_device_attr, NULL),
88 __ATTR(state, S_IRUGO, vmbus_show_device_attr, NULL),
89 __ATTR(class_id, S_IRUGO, vmbus_show_device_attr, NULL),
90 __ATTR(device_id, S_IRUGO, vmbus_show_device_attr, NULL),
91 __ATTR(monitor_id, S_IRUGO, vmbus_show_device_attr, NULL),
92
93 __ATTR(server_monitor_pending, S_IRUGO, vmbus_show_device_attr, NULL),
94 __ATTR(server_monitor_latency, S_IRUGO, vmbus_show_device_attr, NULL),
95 __ATTR(server_monitor_conn_id, S_IRUGO, vmbus_show_device_attr, NULL),
96
97 __ATTR(client_monitor_pending, S_IRUGO, vmbus_show_device_attr, NULL),
98 __ATTR(client_monitor_latency, S_IRUGO, vmbus_show_device_attr, NULL),
99 __ATTR(client_monitor_conn_id, S_IRUGO, vmbus_show_device_attr, NULL),
100
101 __ATTR(out_intr_mask, S_IRUGO, vmbus_show_device_attr, NULL),
102 __ATTR(out_read_index, S_IRUGO, vmbus_show_device_attr, NULL),
103 __ATTR(out_write_index, S_IRUGO, vmbus_show_device_attr, NULL),
104 __ATTR(out_read_bytes_avail, S_IRUGO, vmbus_show_device_attr, NULL),
105 __ATTR(out_write_bytes_avail, S_IRUGO, vmbus_show_device_attr, NULL),
106
107 __ATTR(in_intr_mask, S_IRUGO, vmbus_show_device_attr, NULL),
108 __ATTR(in_read_index, S_IRUGO, vmbus_show_device_attr, NULL),
109 __ATTR(in_write_index, S_IRUGO, vmbus_show_device_attr, NULL),
110 __ATTR(in_read_bytes_avail, S_IRUGO, vmbus_show_device_attr, NULL),
111 __ATTR(in_write_bytes_avail, S_IRUGO, vmbus_show_device_attr, NULL),
112 __ATTR_NULL
113 };
114
115 /* The one and only one */
116 static struct vmbus_driver_context vmbus_drv = {
117 .bus.name = "vmbus",
118 .bus.match = vmbus_match,
119 .bus.shutdown = vmbus_shutdown,
120 .bus.remove = vmbus_remove,
121 .bus.probe = vmbus_probe,
122 .bus.uevent = vmbus_uevent,
123 .bus.dev_attrs = vmbus_device_attrs,
124 };
125
126 static const char *driver_name = "hyperv";
127
128 /*
129 * Windows vmbus does not defined this.
130 * We defined this to be consistent with other devices
131 */
132 /* {c5295816-f63a-4d5f-8d1a-4daf999ca185} */
133 static const struct hv_guid device_type = {
134 .data = {
135 0x16, 0x58, 0x29, 0xc5, 0x3a, 0xf6, 0x5f, 0x4d,
136 0x8d, 0x1a, 0x4d, 0xaf, 0x99, 0x9c, 0xa1, 0x85
137 }
138 };
139
140 /* {ac3760fc-9adf-40aa-9427-a70ed6de95c5} */
141 static const struct hv_guid device_id = {
142 .data = {
143 0xfc, 0x60, 0x37, 0xac, 0xdf, 0x9a, 0xaa, 0x40,
144 0x94, 0x27, 0xa7, 0x0e, 0xd6, 0xde, 0x95, 0xc5
145 }
146 };
147
148 static struct hv_device *vmbus_device; /* vmbus root device */
149
150 /*
151 * vmbus_child_dev_add - Registers the child device with the vmbus
152 */
153 int vmbus_child_dev_add(struct hv_device *child_dev)
154 {
155 return vmbus_child_device_register(vmbus_device, child_dev);
156 }
157
158 /*
159 * vmbus_dev_add - Callback when the root bus device is added
160 */
161 static int vmbus_dev_add(struct hv_device *dev, void *info)
162 {
163 u32 *irqvector = info;
164 int ret;
165
166 vmbus_device = dev;
167
168 memcpy(&vmbus_device->dev_type, &device_type, sizeof(struct hv_guid));
169 memcpy(&vmbus_device->dev_instance, &device_id,
170 sizeof(struct hv_guid));
171
172 /* strcpy(dev->name, "vmbus"); */
173 /* SynIC setup... */
174 on_each_cpu(hv_synic_init, (void *)irqvector, 1);
175
176 /* Connect to VMBus in the root partition */
177 ret = vmbus_connect();
178
179 /* VmbusSendEvent(device->localPortId+1); */
180 return ret;
181 }
182
183 /*
184 * vmbus_dev_rm - Callback when the root bus device is removed
185 */
186 static int vmbus_dev_rm(struct hv_device *dev)
187 {
188 int ret = 0;
189
190 vmbus_release_unattached_channels();
191 vmbus_disconnect();
192 on_each_cpu(hv_synic_cleanup, NULL, 1);
193 return ret;
194 }
195
196 /*
197 * vmbus_cleanup - Perform any cleanup when the driver is removed
198 */
199 static void vmbus_cleanup(struct hv_driver *drv)
200 {
201 /* struct vmbus_driver *driver = (struct vmbus_driver *)drv; */
202
203 hv_cleanup();
204 }
205
206 struct onmessage_work_context {
207 struct work_struct work;
208 struct hv_message msg;
209 };
210
211 static void vmbus_onmessage_work(struct work_struct *work)
212 {
213 struct onmessage_work_context *ctx;
214
215 ctx = container_of(work, struct onmessage_work_context,
216 work);
217 vmbus_onmessage(&ctx->msg);
218 kfree(ctx);
219 }
220
221 /*
222 * vmbus_on_msg_dpc - DPC routine to handle messages from the hypervisior
223 */
224 static void vmbus_on_msg_dpc(struct hv_driver *drv)
225 {
226 int cpu = smp_processor_id();
227 void *page_addr = hv_context.synic_message_page[cpu];
228 struct hv_message *msg = (struct hv_message *)page_addr +
229 VMBUS_MESSAGE_SINT;
230 struct onmessage_work_context *ctx;
231
232 while (1) {
233 if (msg->header.message_type == HVMSG_NONE) {
234 /* no msg */
235 break;
236 } else {
237 ctx = kmalloc(sizeof(*ctx), GFP_ATOMIC);
238 if (ctx == NULL)
239 continue;
240 INIT_WORK(&ctx->work, vmbus_onmessage_work);
241 memcpy(&ctx->msg, msg, sizeof(*msg));
242 queue_work(vmbus_connection.work_queue, &ctx->work);
243 }
244
245 msg->header.message_type = HVMSG_NONE;
246
247 /*
248 * Make sure the write to MessageType (ie set to
249 * HVMSG_NONE) happens before we read the
250 * MessagePending and EOMing. Otherwise, the EOMing
251 * will not deliver any more messages since there is
252 * no empty slot
253 */
254 mb();
255
256 if (msg->header.message_flags.msg_pending) {
257 /*
258 * This will cause message queue rescan to
259 * possibly deliver another msg from the
260 * hypervisor
261 */
262 wrmsrl(HV_X64_MSR_EOM, 0);
263 }
264 }
265 }
266
267 /*
268 * vmbus_on_isr - ISR routine
269 */
270 static int vmbus_on_isr(struct hv_driver *drv)
271 {
272 int ret = 0;
273 int cpu = smp_processor_id();
274 void *page_addr;
275 struct hv_message *msg;
276 union hv_synic_event_flags *event;
277
278 page_addr = hv_context.synic_message_page[cpu];
279 msg = (struct hv_message *)page_addr + VMBUS_MESSAGE_SINT;
280
281 /* Check if there are actual msgs to be process */
282 if (msg->header.message_type != HVMSG_NONE) {
283 DPRINT_DBG(VMBUS, "received msg type %d size %d",
284 msg->header.message_type,
285 msg->header.payload_size);
286 ret |= 0x1;
287 }
288
289 /* TODO: Check if there are events to be process */
290 page_addr = hv_context.synic_event_page[cpu];
291 event = (union hv_synic_event_flags *)page_addr + VMBUS_MESSAGE_SINT;
292
293 /* Since we are a child, we only need to check bit 0 */
294 if (test_and_clear_bit(0, (unsigned long *) &event->flags32[0])) {
295 DPRINT_DBG(VMBUS, "received event %d", event->flags32[0]);
296 ret |= 0x2;
297 }
298
299 return ret;
300 }
301
302 static void get_channel_info(struct hv_device *device,
303 struct hv_device_info *info)
304 {
305 struct vmbus_channel_debug_info debug_info;
306
307 if (!device->channel)
308 return;
309
310 vmbus_get_debug_info(device->channel, &debug_info);
311
312 info->chn_id = debug_info.relid;
313 info->chn_state = debug_info.state;
314 memcpy(&info->chn_type, &debug_info.interfacetype,
315 sizeof(struct hv_guid));
316 memcpy(&info->chn_instance, &debug_info.interface_instance,
317 sizeof(struct hv_guid));
318
319 info->monitor_id = debug_info.monitorid;
320
321 info->server_monitor_pending = debug_info.servermonitor_pending;
322 info->server_monitor_latency = debug_info.servermonitor_latency;
323 info->server_monitor_conn_id = debug_info.servermonitor_connectionid;
324
325 info->client_monitor_pending = debug_info.clientmonitor_pending;
326 info->client_monitor_latency = debug_info.clientmonitor_latency;
327 info->client_monitor_conn_id = debug_info.clientmonitor_connectionid;
328
329 info->inbound.int_mask = debug_info.inbound.current_interrupt_mask;
330 info->inbound.read_idx = debug_info.inbound.current_read_index;
331 info->inbound.write_idx = debug_info.inbound.current_write_index;
332 info->inbound.bytes_avail_toread =
333 debug_info.inbound.bytes_avail_toread;
334 info->inbound.bytes_avail_towrite =
335 debug_info.inbound.bytes_avail_towrite;
336
337 info->outbound.int_mask =
338 debug_info.outbound.current_interrupt_mask;
339 info->outbound.read_idx = debug_info.outbound.current_read_index;
340 info->outbound.write_idx = debug_info.outbound.current_write_index;
341 info->outbound.bytes_avail_toread =
342 debug_info.outbound.bytes_avail_toread;
343 info->outbound.bytes_avail_towrite =
344 debug_info.outbound.bytes_avail_towrite;
345 }
346
347 /*
348 * vmbus_show_device_attr - Show the device attribute in sysfs.
349 *
350 * This is invoked when user does a
351 * "cat /sys/bus/vmbus/devices/<busdevice>/<attr name>"
352 */
353 static ssize_t vmbus_show_device_attr(struct device *dev,
354 struct device_attribute *dev_attr,
355 char *buf)
356 {
357 struct vm_device *device_ctx = device_to_vm_device(dev);
358 struct hv_device_info device_info;
359
360 memset(&device_info, 0, sizeof(struct hv_device_info));
361
362 get_channel_info(&device_ctx->device_obj, &device_info);
363
364 if (!strcmp(dev_attr->attr.name, "class_id")) {
365 return sprintf(buf, "{%02x%02x%02x%02x-%02x%02x-%02x%02x-"
366 "%02x%02x%02x%02x%02x%02x%02x%02x}\n",
367 device_info.chn_type.data[3],
368 device_info.chn_type.data[2],
369 device_info.chn_type.data[1],
370 device_info.chn_type.data[0],
371 device_info.chn_type.data[5],
372 device_info.chn_type.data[4],
373 device_info.chn_type.data[7],
374 device_info.chn_type.data[6],
375 device_info.chn_type.data[8],
376 device_info.chn_type.data[9],
377 device_info.chn_type.data[10],
378 device_info.chn_type.data[11],
379 device_info.chn_type.data[12],
380 device_info.chn_type.data[13],
381 device_info.chn_type.data[14],
382 device_info.chn_type.data[15]);
383 } else if (!strcmp(dev_attr->attr.name, "device_id")) {
384 return sprintf(buf, "{%02x%02x%02x%02x-%02x%02x-%02x%02x-"
385 "%02x%02x%02x%02x%02x%02x%02x%02x}\n",
386 device_info.chn_instance.data[3],
387 device_info.chn_instance.data[2],
388 device_info.chn_instance.data[1],
389 device_info.chn_instance.data[0],
390 device_info.chn_instance.data[5],
391 device_info.chn_instance.data[4],
392 device_info.chn_instance.data[7],
393 device_info.chn_instance.data[6],
394 device_info.chn_instance.data[8],
395 device_info.chn_instance.data[9],
396 device_info.chn_instance.data[10],
397 device_info.chn_instance.data[11],
398 device_info.chn_instance.data[12],
399 device_info.chn_instance.data[13],
400 device_info.chn_instance.data[14],
401 device_info.chn_instance.data[15]);
402 } else if (!strcmp(dev_attr->attr.name, "state")) {
403 return sprintf(buf, "%d\n", device_info.chn_state);
404 } else if (!strcmp(dev_attr->attr.name, "id")) {
405 return sprintf(buf, "%d\n", device_info.chn_id);
406 } else if (!strcmp(dev_attr->attr.name, "out_intr_mask")) {
407 return sprintf(buf, "%d\n", device_info.outbound.int_mask);
408 } else if (!strcmp(dev_attr->attr.name, "out_read_index")) {
409 return sprintf(buf, "%d\n", device_info.outbound.read_idx);
410 } else if (!strcmp(dev_attr->attr.name, "out_write_index")) {
411 return sprintf(buf, "%d\n", device_info.outbound.write_idx);
412 } else if (!strcmp(dev_attr->attr.name, "out_read_bytes_avail")) {
413 return sprintf(buf, "%d\n",
414 device_info.outbound.bytes_avail_toread);
415 } else if (!strcmp(dev_attr->attr.name, "out_write_bytes_avail")) {
416 return sprintf(buf, "%d\n",
417 device_info.outbound.bytes_avail_towrite);
418 } else if (!strcmp(dev_attr->attr.name, "in_intr_mask")) {
419 return sprintf(buf, "%d\n", device_info.inbound.int_mask);
420 } else if (!strcmp(dev_attr->attr.name, "in_read_index")) {
421 return sprintf(buf, "%d\n", device_info.inbound.read_idx);
422 } else if (!strcmp(dev_attr->attr.name, "in_write_index")) {
423 return sprintf(buf, "%d\n", device_info.inbound.write_idx);
424 } else if (!strcmp(dev_attr->attr.name, "in_read_bytes_avail")) {
425 return sprintf(buf, "%d\n",
426 device_info.inbound.bytes_avail_toread);
427 } else if (!strcmp(dev_attr->attr.name, "in_write_bytes_avail")) {
428 return sprintf(buf, "%d\n",
429 device_info.inbound.bytes_avail_towrite);
430 } else if (!strcmp(dev_attr->attr.name, "monitor_id")) {
431 return sprintf(buf, "%d\n", device_info.monitor_id);
432 } else if (!strcmp(dev_attr->attr.name, "server_monitor_pending")) {
433 return sprintf(buf, "%d\n", device_info.server_monitor_pending);
434 } else if (!strcmp(dev_attr->attr.name, "server_monitor_latency")) {
435 return sprintf(buf, "%d\n", device_info.server_monitor_latency);
436 } else if (!strcmp(dev_attr->attr.name, "server_monitor_conn_id")) {
437 return sprintf(buf, "%d\n",
438 device_info.server_monitor_conn_id);
439 } else if (!strcmp(dev_attr->attr.name, "client_monitor_pending")) {
440 return sprintf(buf, "%d\n", device_info.client_monitor_pending);
441 } else if (!strcmp(dev_attr->attr.name, "client_monitor_latency")) {
442 return sprintf(buf, "%d\n", device_info.client_monitor_latency);
443 } else if (!strcmp(dev_attr->attr.name, "client_monitor_conn_id")) {
444 return sprintf(buf, "%d\n",
445 device_info.client_monitor_conn_id);
446 } else {
447 return 0;
448 }
449 }
450
451 /*
452 * vmbus_bus_init -Main vmbus driver initialization routine.
453 *
454 * Here, we
455 * - initialize the vmbus driver context
456 * - setup various driver entry points
457 * - invoke the vmbus hv main init routine
458 * - get the irq resource
459 * - invoke the vmbus to add the vmbus root device
460 * - setup the vmbus root device
461 * - retrieve the channel offers
462 */
463 static int vmbus_bus_init(void)
464 {
465 struct vmbus_driver_context *vmbus_drv_ctx = &vmbus_drv;
466 struct hv_driver *driver = &vmbus_drv.drv_obj;
467 struct vm_device *dev_ctx = &vmbus_drv.device_ctx;
468 int ret;
469 unsigned int vector;
470
471 DPRINT_INFO(VMBUS, "+++++++ HV Driver version = %s +++++++",
472 HV_DRV_VERSION);
473 DPRINT_INFO(VMBUS, "+++++++ Vmbus supported version = %d +++++++",
474 VMBUS_REVISION_NUMBER);
475 DPRINT_INFO(VMBUS, "+++++++ Vmbus using SINT %d +++++++",
476 VMBUS_MESSAGE_SINT);
477 DPRINT_DBG(VMBUS, "sizeof(vmbus_channel_packet_page_buffer)=%zd, "
478 "sizeof(VMBUS_CHANNEL_PACKET_MULITPAGE_BUFFER)=%zd",
479 sizeof(struct vmbus_channel_packet_page_buffer),
480 sizeof(struct vmbus_channel_packet_multipage_buffer));
481
482 driver->name = driver_name;
483 memcpy(&driver->dev_type, &device_type, sizeof(struct hv_guid));
484
485 /* Setup dispatch table */
486 driver->dev_add = vmbus_dev_add;
487 driver->dev_rm = vmbus_dev_rm;
488 driver->cleanup = vmbus_cleanup;
489
490 /* Hypervisor initialization...setup hypercall page..etc */
491 ret = hv_init();
492 if (ret != 0) {
493 DPRINT_ERR(VMBUS, "Unable to initialize the hypervisor - 0x%x",
494 ret);
495 goto cleanup;
496 }
497
498 /* Sanity checks */
499 if (!driver->dev_add) {
500 DPRINT_ERR(VMBUS_DRV, "OnDeviceAdd() routine not set");
501 ret = -1;
502 goto cleanup;
503 }
504
505 vmbus_drv_ctx->bus.name = driver->name;
506
507 /* Initialize the bus context */
508 tasklet_init(&vmbus_drv_ctx->msg_dpc, vmbus_msg_dpc,
509 (unsigned long)driver);
510 tasklet_init(&vmbus_drv_ctx->event_dpc, vmbus_event_dpc,
511 (unsigned long)driver);
512
513 /* Now, register the bus driver with LDM */
514 ret = bus_register(&vmbus_drv_ctx->bus);
515 if (ret) {
516 ret = -1;
517 goto cleanup;
518 }
519
520 /* Get the interrupt resource */
521 ret = request_irq(vmbus_irq, vmbus_isr, IRQF_SAMPLE_RANDOM,
522 driver->name, NULL);
523
524 if (ret != 0) {
525 DPRINT_ERR(VMBUS_DRV, "ERROR - Unable to request IRQ %d",
526 vmbus_irq);
527
528 bus_unregister(&vmbus_drv_ctx->bus);
529
530 ret = -1;
531 goto cleanup;
532 }
533 vector = VMBUS_IRQ_VECTOR;
534
535 DPRINT_INFO(VMBUS_DRV, "irq 0x%x vector 0x%x", vmbus_irq, vector);
536
537 /* Call to bus driver to add the root device */
538 memset(dev_ctx, 0, sizeof(struct vm_device));
539
540 ret = driver->dev_add(&dev_ctx->device_obj, &vector);
541 if (ret != 0) {
542 DPRINT_ERR(VMBUS_DRV,
543 "ERROR - Unable to add vmbus root device");
544
545 free_irq(vmbus_irq, NULL);
546
547 bus_unregister(&vmbus_drv_ctx->bus);
548
549 ret = -1;
550 goto cleanup;
551 }
552 /* strcpy(dev_ctx->device.bus_id, dev_ctx->device_obj.name); */
553 dev_set_name(&dev_ctx->device, "vmbus_0_0");
554 memcpy(&dev_ctx->class_id, &dev_ctx->device_obj.dev_type,
555 sizeof(struct hv_guid));
556 memcpy(&dev_ctx->device_id, &dev_ctx->device_obj.dev_instance,
557 sizeof(struct hv_guid));
558
559 /* No need to bind a driver to the root device. */
560 dev_ctx->device.parent = NULL;
561 /* NULL; vmbus_remove() does not get invoked */
562 dev_ctx->device.bus = &vmbus_drv_ctx->bus;
563
564 /* Setup the device dispatch table */
565 dev_ctx->device.release = vmbus_bus_release;
566
567 /* Setup the bus as root device */
568 ret = device_register(&dev_ctx->device);
569 if (ret) {
570 DPRINT_ERR(VMBUS_DRV,
571 "ERROR - Unable to register vmbus root device");
572
573 free_irq(vmbus_irq, NULL);
574 bus_unregister(&vmbus_drv_ctx->bus);
575
576 ret = -1;
577 goto cleanup;
578 }
579
580 vmbus_request_offers();
581 wait_for_completion(&hv_channel_ready);
582
583 cleanup:
584 return ret;
585 }
586
587 /*
588 * vmbus_bus_exit - Terminate the vmbus driver.
589 *
590 * This routine is opposite of vmbus_bus_init()
591 */
592 static void vmbus_bus_exit(void)
593 {
594 struct hv_driver *driver = &vmbus_drv.drv_obj;
595 struct vmbus_driver_context *vmbus_drv_ctx = &vmbus_drv;
596
597 struct vm_device *dev_ctx = &vmbus_drv.device_ctx;
598
599 /* Remove the root device */
600 if (driver->dev_rm)
601 driver->dev_rm(&dev_ctx->device_obj);
602
603 if (driver->cleanup)
604 driver->cleanup(driver);
605
606 /* Unregister the root bus device */
607 device_unregister(&dev_ctx->device);
608
609 bus_unregister(&vmbus_drv_ctx->bus);
610
611 free_irq(vmbus_irq, NULL);
612
613 tasklet_kill(&vmbus_drv_ctx->msg_dpc);
614 tasklet_kill(&vmbus_drv_ctx->event_dpc);
615 }
616
617
618 /**
619 * vmbus_child_driver_register() - Register a vmbus's child driver
620 * @driver_ctx: Pointer to driver structure you want to register
621 *
622 * @driver_ctx is of type &struct driver_context
623 *
624 * Registers the given driver with Linux through the 'driver_register()' call
625 * And sets up the hyper-v vmbus handling for this driver.
626 * It will return the state of the 'driver_register()' call.
627 *
628 * Mainly used by Hyper-V drivers.
629 */
630 int vmbus_child_driver_register(struct driver_context *driver_ctx)
631 {
632 int ret;
633
634 DPRINT_INFO(VMBUS_DRV, "child driver (%p) registering - name %s",
635 driver_ctx, driver_ctx->driver.name);
636
637 /* The child driver on this vmbus */
638 driver_ctx->driver.bus = &vmbus_drv.bus;
639
640 ret = driver_register(&driver_ctx->driver);
641
642 vmbus_request_offers();
643
644 return ret;
645 }
646 EXPORT_SYMBOL(vmbus_child_driver_register);
647
648 /**
649 * vmbus_child_driver_unregister() - Unregister a vmbus's child driver
650 * @driver_ctx: Pointer to driver structure you want to un-register
651 *
652 * @driver_ctx is of type &struct driver_context
653 *
654 * Un-register the given driver with Linux through the 'driver_unregister()'
655 * call. And ungegisters the driver from the Hyper-V vmbus handler.
656 *
657 * Mainly used by Hyper-V drivers.
658 */
659 void vmbus_child_driver_unregister(struct driver_context *driver_ctx)
660 {
661 DPRINT_INFO(VMBUS_DRV, "child driver (%p) unregistering - name %s",
662 driver_ctx, driver_ctx->driver.name);
663
664 driver_unregister(&driver_ctx->driver);
665
666 driver_ctx->driver.bus = NULL;
667 }
668 EXPORT_SYMBOL(vmbus_child_driver_unregister);
669
670 /*
671 * vmbus_child_device_create - Creates and registers a new child device
672 * on the vmbus.
673 */
674 struct hv_device *vmbus_child_device_create(struct hv_guid *type,
675 struct hv_guid *instance,
676 struct vmbus_channel *channel)
677 {
678 struct vm_device *child_device_ctx;
679 struct hv_device *child_device_obj;
680
681 /* Allocate the new child device */
682 child_device_ctx = kzalloc(sizeof(struct vm_device), GFP_KERNEL);
683 if (!child_device_ctx) {
684 DPRINT_ERR(VMBUS_DRV,
685 "unable to allocate device_context for child device");
686 return NULL;
687 }
688
689 DPRINT_DBG(VMBUS_DRV, "child device (%p) allocated - "
690 "type {%02x%02x%02x%02x-%02x%02x-%02x%02x-"
691 "%02x%02x%02x%02x%02x%02x%02x%02x},"
692 "id {%02x%02x%02x%02x-%02x%02x-%02x%02x-"
693 "%02x%02x%02x%02x%02x%02x%02x%02x}",
694 &child_device_ctx->device,
695 type->data[3], type->data[2], type->data[1], type->data[0],
696 type->data[5], type->data[4], type->data[7], type->data[6],
697 type->data[8], type->data[9], type->data[10], type->data[11],
698 type->data[12], type->data[13], type->data[14], type->data[15],
699 instance->data[3], instance->data[2],
700 instance->data[1], instance->data[0],
701 instance->data[5], instance->data[4],
702 instance->data[7], instance->data[6],
703 instance->data[8], instance->data[9],
704 instance->data[10], instance->data[11],
705 instance->data[12], instance->data[13],
706 instance->data[14], instance->data[15]);
707
708 child_device_obj = &child_device_ctx->device_obj;
709 child_device_obj->channel = channel;
710 memcpy(&child_device_obj->dev_type, type, sizeof(struct hv_guid));
711 memcpy(&child_device_obj->dev_instance, instance,
712 sizeof(struct hv_guid));
713
714 memcpy(&child_device_ctx->class_id, type, sizeof(struct hv_guid));
715 memcpy(&child_device_ctx->device_id, instance, sizeof(struct hv_guid));
716
717 return child_device_obj;
718 }
719
720 /*
721 * vmbus_child_device_register - Register the child device on the specified bus
722 */
723 int vmbus_child_device_register(struct hv_device *root_device_obj,
724 struct hv_device *child_device_obj)
725 {
726 int ret = 0;
727 struct vm_device *root_device_ctx =
728 to_vm_device(root_device_obj);
729 struct vm_device *child_device_ctx =
730 to_vm_device(child_device_obj);
731 static atomic_t device_num = ATOMIC_INIT(0);
732
733 DPRINT_DBG(VMBUS_DRV, "child device (%p) registering",
734 child_device_ctx);
735
736 /* Set the device name. Otherwise, device_register() will fail. */
737 dev_set_name(&child_device_ctx->device, "vmbus_0_%d",
738 atomic_inc_return(&device_num));
739
740 /* The new device belongs to this bus */
741 child_device_ctx->device.bus = &vmbus_drv.bus; /* device->dev.bus; */
742 child_device_ctx->device.parent = &root_device_ctx->device;
743 child_device_ctx->device.release = vmbus_device_release;
744
745 /*
746 * Register with the LDM. This will kick off the driver/device
747 * binding...which will eventually call vmbus_match() and vmbus_probe()
748 */
749 ret = device_register(&child_device_ctx->device);
750
751 /* vmbus_probe() error does not get propergate to device_register(). */
752 ret = child_device_ctx->probe_error;
753
754 if (ret)
755 DPRINT_ERR(VMBUS_DRV, "unable to register child device (%p)",
756 &child_device_ctx->device);
757 else
758 DPRINT_INFO(VMBUS_DRV, "child device (%p) registered",
759 &child_device_ctx->device);
760
761 return ret;
762 }
763
764 /*
765 * vmbus_child_device_unregister - Remove the specified child device
766 * from the vmbus.
767 */
768 void vmbus_child_device_unregister(struct hv_device *device_obj)
769 {
770 struct vm_device *device_ctx = to_vm_device(device_obj);
771
772 DPRINT_INFO(VMBUS_DRV, "unregistering child device (%p)",
773 &device_ctx->device);
774
775 /*
776 * Kick off the process of unregistering the device.
777 * This will call vmbus_remove() and eventually vmbus_device_release()
778 */
779 device_unregister(&device_ctx->device);
780
781 DPRINT_INFO(VMBUS_DRV, "child device (%p) unregistered",
782 &device_ctx->device);
783 }
784
785 /*
786 * vmbus_uevent - add uevent for our device
787 *
788 * This routine is invoked when a device is added or removed on the vmbus to
789 * generate a uevent to udev in the userspace. The udev will then look at its
790 * rule and the uevent generated here to load the appropriate driver
791 */
792 static int vmbus_uevent(struct device *device, struct kobj_uevent_env *env)
793 {
794 struct vm_device *device_ctx = device_to_vm_device(device);
795 int ret;
796
797 DPRINT_INFO(VMBUS_DRV, "generating uevent - VMBUS_DEVICE_CLASS_GUID={"
798 "%02x%02x%02x%02x-%02x%02x-%02x%02x-"
799 "%02x%02x%02x%02x%02x%02x%02x%02x}",
800 device_ctx->class_id.data[3], device_ctx->class_id.data[2],
801 device_ctx->class_id.data[1], device_ctx->class_id.data[0],
802 device_ctx->class_id.data[5], device_ctx->class_id.data[4],
803 device_ctx->class_id.data[7], device_ctx->class_id.data[6],
804 device_ctx->class_id.data[8], device_ctx->class_id.data[9],
805 device_ctx->class_id.data[10],
806 device_ctx->class_id.data[11],
807 device_ctx->class_id.data[12],
808 device_ctx->class_id.data[13],
809 device_ctx->class_id.data[14],
810 device_ctx->class_id.data[15]);
811
812 ret = add_uevent_var(env, "VMBUS_DEVICE_CLASS_GUID={"
813 "%02x%02x%02x%02x-%02x%02x-%02x%02x-"
814 "%02x%02x%02x%02x%02x%02x%02x%02x}",
815 device_ctx->class_id.data[3],
816 device_ctx->class_id.data[2],
817 device_ctx->class_id.data[1],
818 device_ctx->class_id.data[0],
819 device_ctx->class_id.data[5],
820 device_ctx->class_id.data[4],
821 device_ctx->class_id.data[7],
822 device_ctx->class_id.data[6],
823 device_ctx->class_id.data[8],
824 device_ctx->class_id.data[9],
825 device_ctx->class_id.data[10],
826 device_ctx->class_id.data[11],
827 device_ctx->class_id.data[12],
828 device_ctx->class_id.data[13],
829 device_ctx->class_id.data[14],
830 device_ctx->class_id.data[15]);
831
832 if (ret)
833 return ret;
834
835 ret = add_uevent_var(env, "VMBUS_DEVICE_DEVICE_GUID={"
836 "%02x%02x%02x%02x-%02x%02x-%02x%02x-"
837 "%02x%02x%02x%02x%02x%02x%02x%02x}",
838 device_ctx->device_id.data[3],
839 device_ctx->device_id.data[2],
840 device_ctx->device_id.data[1],
841 device_ctx->device_id.data[0],
842 device_ctx->device_id.data[5],
843 device_ctx->device_id.data[4],
844 device_ctx->device_id.data[7],
845 device_ctx->device_id.data[6],
846 device_ctx->device_id.data[8],
847 device_ctx->device_id.data[9],
848 device_ctx->device_id.data[10],
849 device_ctx->device_id.data[11],
850 device_ctx->device_id.data[12],
851 device_ctx->device_id.data[13],
852 device_ctx->device_id.data[14],
853 device_ctx->device_id.data[15]);
854 if (ret)
855 return ret;
856
857 return 0;
858 }
859
860 /*
861 * vmbus_match - Attempt to match the specified device to the specified driver
862 */
863 static int vmbus_match(struct device *device, struct device_driver *driver)
864 {
865 int match = 0;
866 struct driver_context *driver_ctx = driver_to_driver_context(driver);
867 struct vm_device *device_ctx = device_to_vm_device(device);
868
869 /* We found our driver ? */
870 if (memcmp(&device_ctx->class_id, &driver_ctx->class_id,
871 sizeof(struct hv_guid)) == 0) {
872 /*
873 * !! NOTE: The driver_ctx is not a vmbus_drv_ctx. We typecast
874 * it here to access the struct hv_driver field
875 */
876 struct vmbus_driver_context *vmbus_drv_ctx =
877 (struct vmbus_driver_context *)driver_ctx;
878
879 device_ctx->device_obj.drv = &vmbus_drv_ctx->drv_obj;
880 DPRINT_INFO(VMBUS_DRV,
881 "device object (%p) set to driver object (%p)",
882 &device_ctx->device_obj,
883 device_ctx->device_obj.drv);
884
885 match = 1;
886 }
887 return match;
888 }
889
890 /*
891 * vmbus_probe_failed_cb - Callback when a driver probe failed in vmbus_probe()
892 *
893 * We need a callback because we cannot invoked device_unregister() inside
894 * vmbus_probe() since vmbus_probe() may be invoked inside device_register()
895 * i.e. we cannot call device_unregister() inside device_register()
896 */
897 static void vmbus_probe_failed_cb(struct work_struct *context)
898 {
899 struct vm_device *device_ctx = (struct vm_device *)context;
900
901 /*
902 * Kick off the process of unregistering the device.
903 * This will call vmbus_remove() and eventually vmbus_device_release()
904 */
905 device_unregister(&device_ctx->device);
906
907 /* put_device(&device_ctx->device); */
908 }
909
910 /*
911 * vmbus_probe - Add the new vmbus's child device
912 */
913 static int vmbus_probe(struct device *child_device)
914 {
915 int ret = 0;
916 struct driver_context *driver_ctx =
917 driver_to_driver_context(child_device->driver);
918 struct vm_device *device_ctx =
919 device_to_vm_device(child_device);
920
921 /* Let the specific open-source driver handles the probe if it can */
922 if (driver_ctx->probe) {
923 ret = device_ctx->probe_error = driver_ctx->probe(child_device);
924 if (ret != 0) {
925 DPRINT_ERR(VMBUS_DRV, "probe() failed for device %s "
926 "(%p) on driver %s (%d)...",
927 dev_name(child_device), child_device,
928 child_device->driver->name, ret);
929
930 INIT_WORK(&device_ctx->probe_failed_work_item,
931 vmbus_probe_failed_cb);
932 schedule_work(&device_ctx->probe_failed_work_item);
933 }
934 } else {
935 DPRINT_ERR(VMBUS_DRV, "probe() method not set for driver - %s",
936 child_device->driver->name);
937 ret = -1;
938 }
939 return ret;
940 }
941
942 /*
943 * vmbus_remove - Remove a vmbus device
944 */
945 static int vmbus_remove(struct device *child_device)
946 {
947 int ret;
948 struct driver_context *driver_ctx;
949
950 /* Special case root bus device */
951 if (child_device->parent == NULL) {
952 /*
953 * No-op since it is statically defined and handle in
954 * vmbus_bus_exit()
955 */
956 return 0;
957 }
958
959 if (child_device->driver) {
960 driver_ctx = driver_to_driver_context(child_device->driver);
961
962 /*
963 * Let the specific open-source driver handles the removal if
964 * it can
965 */
966 if (driver_ctx->remove) {
967 ret = driver_ctx->remove(child_device);
968 } else {
969 DPRINT_ERR(VMBUS_DRV,
970 "remove() method not set for driver - %s",
971 child_device->driver->name);
972 ret = -1;
973 }
974 }
975
976 return 0;
977 }
978
979 /*
980 * vmbus_shutdown - Shutdown a vmbus device
981 */
982 static void vmbus_shutdown(struct device *child_device)
983 {
984 struct driver_context *driver_ctx;
985
986 /* Special case root bus device */
987 if (child_device->parent == NULL) {
988 /*
989 * No-op since it is statically defined and handle in
990 * vmbus_bus_exit()
991 */
992 return;
993 }
994
995 /* The device may not be attached yet */
996 if (!child_device->driver)
997 return;
998
999 driver_ctx = driver_to_driver_context(child_device->driver);
1000
1001 /* Let the specific open-source driver handles the removal if it can */
1002 if (driver_ctx->shutdown)
1003 driver_ctx->shutdown(child_device);
1004
1005 return;
1006 }
1007
1008 /*
1009 * vmbus_bus_release - Final callback release of the vmbus root device
1010 */
1011 static void vmbus_bus_release(struct device *device)
1012 {
1013 /* FIXME */
1014 /* Empty release functions are a bug, or a major sign
1015 * of a problem design, this MUST BE FIXED! */
1016 dev_err(device, "%s needs to be fixed!\n", __func__);
1017 WARN_ON(1);
1018 }
1019
1020 /*
1021 * vmbus_device_release - Final callback release of the vmbus child device
1022 */
1023 static void vmbus_device_release(struct device *device)
1024 {
1025 struct vm_device *device_ctx = device_to_vm_device(device);
1026
1027 kfree(device_ctx);
1028
1029 /* !!DO NOT REFERENCE device_ctx anymore at this point!! */
1030 }
1031
1032 /*
1033 * vmbus_msg_dpc - Tasklet routine to handle hypervisor messages
1034 */
1035 static void vmbus_msg_dpc(unsigned long data)
1036 {
1037 struct hv_driver *driver = (struct hv_driver *)data;
1038
1039 /* Call to bus driver to handle interrupt */
1040 vmbus_on_msg_dpc(driver);
1041 }
1042
1043 /*
1044 * vmbus_event_dpc - Tasklet routine to handle hypervisor events
1045 */
1046 static void vmbus_event_dpc(unsigned long data)
1047 {
1048 /* Call to bus driver to handle interrupt */
1049 vmbus_on_event();
1050 }
1051
1052 static irqreturn_t vmbus_isr(int irq, void *dev_id)
1053 {
1054 struct hv_driver *driver = &vmbus_drv.drv_obj;
1055 int ret;
1056
1057 /* Call to bus driver to handle interrupt */
1058 ret = vmbus_on_isr(driver);
1059
1060 /* Schedules a dpc if necessary */
1061 if (ret > 0) {
1062 if (test_bit(0, (unsigned long *)&ret))
1063 tasklet_schedule(&vmbus_drv.msg_dpc);
1064
1065 if (test_bit(1, (unsigned long *)&ret))
1066 tasklet_schedule(&vmbus_drv.event_dpc);
1067
1068 return IRQ_HANDLED;
1069 } else {
1070 return IRQ_NONE;
1071 }
1072 }
1073
1074 static struct dmi_system_id __initdata microsoft_hv_dmi_table[] = {
1075 {
1076 .ident = "Hyper-V",
1077 .matches = {
1078 DMI_MATCH(DMI_SYS_VENDOR, "Microsoft Corporation"),
1079 DMI_MATCH(DMI_PRODUCT_NAME, "Virtual Machine"),
1080 DMI_MATCH(DMI_BOARD_NAME, "Virtual Machine"),
1081 },
1082 },
1083 { },
1084 };
1085 MODULE_DEVICE_TABLE(dmi, microsoft_hv_dmi_table);
1086
1087 static int __init vmbus_init(void)
1088 {
1089 DPRINT_INFO(VMBUS_DRV,
1090 "Vmbus initializing.... current log level 0x%x (%x,%x)",
1091 vmbus_loglevel, HIWORD(vmbus_loglevel), LOWORD(vmbus_loglevel));
1092 /* Todo: it is used for loglevel, to be ported to new kernel. */
1093
1094 if (!dmi_check_system(microsoft_hv_dmi_table))
1095 return -ENODEV;
1096
1097 return vmbus_bus_init();
1098 }
1099
1100 static void __exit vmbus_exit(void)
1101 {
1102 vmbus_bus_exit();
1103 /* Todo: it is used for loglevel, to be ported to new kernel. */
1104 }
1105
1106 /*
1107 * We use a PCI table to determine if we should autoload this driver This is
1108 * needed by distro tools to determine if the hyperv drivers should be
1109 * installed and/or configured. We don't do anything else with the table, but
1110 * it needs to be present.
1111 */
1112 static const struct pci_device_id microsoft_hv_pci_table[] = {
1113 { PCI_DEVICE(0x1414, 0x5353) }, /* VGA compatible controller */
1114 { 0 }
1115 };
1116 MODULE_DEVICE_TABLE(pci, microsoft_hv_pci_table);
1117
1118 MODULE_LICENSE("GPL");
1119 MODULE_VERSION(HV_DRV_VERSION);
1120 module_param(vmbus_irq, int, S_IRUGO);
1121 module_param(vmbus_loglevel, int, S_IRUGO);
1122
1123 module_init(vmbus_init);
1124 module_exit(vmbus_exit);
Linux kernel - Deliverables
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