Commit | Line | Data |
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3e7ee490 | 1 | /* |
3e7ee490 HJ |
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> | |
b0069f43 | 20 | * K. Y. Srinivasan <kys@microsoft.com> |
52e5c1ce | 21 | * |
3e7ee490 | 22 | */ |
0a46618d HJ |
23 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
24 | ||
3e7ee490 HJ |
25 | #include <linux/init.h> |
26 | #include <linux/module.h> | |
27 | #include <linux/device.h> | |
3e7ee490 HJ |
28 | #include <linux/interrupt.h> |
29 | #include <linux/sysctl.h> | |
5a0e3ad6 | 30 | #include <linux/slab.h> |
b0069f43 | 31 | #include <linux/acpi.h> |
8b5d6d3b | 32 | #include <linux/completion.h> |
46a97191 | 33 | #include <linux/hyperv.h> |
b0209501 | 34 | #include <linux/kernel_stat.h> |
407dd164 | 35 | #include <asm/hyperv.h> |
1f94ea81 | 36 | #include <asm/hypervisor.h> |
302a3c0f | 37 | #include <asm/mshyperv.h> |
0f2a6619 | 38 | #include "hyperv_vmbus.h" |
3e7ee490 | 39 | |
607c1a11 | 40 | static struct acpi_device *hv_acpi_dev; |
1168ac22 | 41 | |
59c0e4f0 | 42 | static struct tasklet_struct msg_dpc; |
71a6655d | 43 | static struct completion probe_event; |
b0069f43 | 44 | static int irq; |
98db4335 | 45 | |
90eedf0c GH |
46 | struct resource hyperv_mmio = { |
47 | .name = "hyperv mmio", | |
48 | .flags = IORESOURCE_MEM, | |
49 | }; | |
50 | EXPORT_SYMBOL_GPL(hyperv_mmio); | |
98db4335 | 51 | |
cf6a2eac S |
52 | static int vmbus_exists(void) |
53 | { | |
54 | if (hv_acpi_dev == NULL) | |
55 | return -ENODEV; | |
56 | ||
57 | return 0; | |
58 | } | |
59 | ||
fd776ba9 OH |
60 | #define VMBUS_ALIAS_LEN ((sizeof((struct hv_vmbus_device_id *)0)->guid) * 2) |
61 | static void print_alias_name(struct hv_device *hv_dev, char *alias_name) | |
62 | { | |
63 | int i; | |
64 | for (i = 0; i < VMBUS_ALIAS_LEN; i += 2) | |
65 | sprintf(&alias_name[i], "%02x", hv_dev->dev_type.b[i/2]); | |
66 | } | |
67 | ||
76c52bbe GKH |
68 | static u8 channel_monitor_group(struct vmbus_channel *channel) |
69 | { | |
70 | return (u8)channel->offermsg.monitorid / 32; | |
71 | } | |
72 | ||
73 | static u8 channel_monitor_offset(struct vmbus_channel *channel) | |
74 | { | |
75 | return (u8)channel->offermsg.monitorid % 32; | |
76 | } | |
77 | ||
78 | static u32 channel_pending(struct vmbus_channel *channel, | |
79 | struct hv_monitor_page *monitor_page) | |
80 | { | |
81 | u8 monitor_group = channel_monitor_group(channel); | |
82 | return monitor_page->trigger_group[monitor_group].pending; | |
83 | } | |
84 | ||
1cee272b GKH |
85 | static u32 channel_latency(struct vmbus_channel *channel, |
86 | struct hv_monitor_page *monitor_page) | |
87 | { | |
88 | u8 monitor_group = channel_monitor_group(channel); | |
89 | u8 monitor_offset = channel_monitor_offset(channel); | |
90 | return monitor_page->latency[monitor_group][monitor_offset]; | |
91 | } | |
92 | ||
4947c745 GKH |
93 | static u32 channel_conn_id(struct vmbus_channel *channel, |
94 | struct hv_monitor_page *monitor_page) | |
95 | { | |
96 | u8 monitor_group = channel_monitor_group(channel); | |
97 | u8 monitor_offset = channel_monitor_offset(channel); | |
98 | return monitor_page->parameter[monitor_group][monitor_offset].connectionid.u.id; | |
99 | } | |
100 | ||
03f3a910 GKH |
101 | static ssize_t id_show(struct device *dev, struct device_attribute *dev_attr, |
102 | char *buf) | |
103 | { | |
104 | struct hv_device *hv_dev = device_to_hv_device(dev); | |
105 | ||
106 | if (!hv_dev->channel) | |
107 | return -ENODEV; | |
108 | return sprintf(buf, "%d\n", hv_dev->channel->offermsg.child_relid); | |
109 | } | |
110 | static DEVICE_ATTR_RO(id); | |
111 | ||
a8fb5f3d GKH |
112 | static ssize_t state_show(struct device *dev, struct device_attribute *dev_attr, |
113 | char *buf) | |
114 | { | |
115 | struct hv_device *hv_dev = device_to_hv_device(dev); | |
116 | ||
117 | if (!hv_dev->channel) | |
118 | return -ENODEV; | |
119 | return sprintf(buf, "%d\n", hv_dev->channel->state); | |
120 | } | |
121 | static DEVICE_ATTR_RO(state); | |
122 | ||
5ffd00e2 GKH |
123 | static ssize_t monitor_id_show(struct device *dev, |
124 | struct device_attribute *dev_attr, char *buf) | |
125 | { | |
126 | struct hv_device *hv_dev = device_to_hv_device(dev); | |
127 | ||
128 | if (!hv_dev->channel) | |
129 | return -ENODEV; | |
130 | return sprintf(buf, "%d\n", hv_dev->channel->offermsg.monitorid); | |
131 | } | |
132 | static DEVICE_ATTR_RO(monitor_id); | |
133 | ||
68234c04 GKH |
134 | static ssize_t class_id_show(struct device *dev, |
135 | struct device_attribute *dev_attr, char *buf) | |
136 | { | |
137 | struct hv_device *hv_dev = device_to_hv_device(dev); | |
138 | ||
139 | if (!hv_dev->channel) | |
140 | return -ENODEV; | |
141 | return sprintf(buf, "{%pUl}\n", | |
142 | hv_dev->channel->offermsg.offer.if_type.b); | |
143 | } | |
144 | static DEVICE_ATTR_RO(class_id); | |
145 | ||
7c55e1d0 GKH |
146 | static ssize_t device_id_show(struct device *dev, |
147 | struct device_attribute *dev_attr, char *buf) | |
148 | { | |
149 | struct hv_device *hv_dev = device_to_hv_device(dev); | |
150 | ||
151 | if (!hv_dev->channel) | |
152 | return -ENODEV; | |
153 | return sprintf(buf, "{%pUl}\n", | |
154 | hv_dev->channel->offermsg.offer.if_instance.b); | |
155 | } | |
156 | static DEVICE_ATTR_RO(device_id); | |
157 | ||
647fa371 GKH |
158 | static ssize_t modalias_show(struct device *dev, |
159 | struct device_attribute *dev_attr, char *buf) | |
160 | { | |
161 | struct hv_device *hv_dev = device_to_hv_device(dev); | |
162 | char alias_name[VMBUS_ALIAS_LEN + 1]; | |
163 | ||
164 | print_alias_name(hv_dev, alias_name); | |
165 | return sprintf(buf, "vmbus:%s\n", alias_name); | |
166 | } | |
167 | static DEVICE_ATTR_RO(modalias); | |
168 | ||
76c52bbe GKH |
169 | static ssize_t server_monitor_pending_show(struct device *dev, |
170 | struct device_attribute *dev_attr, | |
171 | char *buf) | |
172 | { | |
173 | struct hv_device *hv_dev = device_to_hv_device(dev); | |
174 | ||
175 | if (!hv_dev->channel) | |
176 | return -ENODEV; | |
177 | return sprintf(buf, "%d\n", | |
178 | channel_pending(hv_dev->channel, | |
179 | vmbus_connection.monitor_pages[1])); | |
180 | } | |
181 | static DEVICE_ATTR_RO(server_monitor_pending); | |
182 | ||
183 | static ssize_t client_monitor_pending_show(struct device *dev, | |
184 | struct device_attribute *dev_attr, | |
185 | char *buf) | |
186 | { | |
187 | struct hv_device *hv_dev = device_to_hv_device(dev); | |
188 | ||
189 | if (!hv_dev->channel) | |
190 | return -ENODEV; | |
191 | return sprintf(buf, "%d\n", | |
192 | channel_pending(hv_dev->channel, | |
193 | vmbus_connection.monitor_pages[1])); | |
194 | } | |
195 | static DEVICE_ATTR_RO(client_monitor_pending); | |
68234c04 | 196 | |
1cee272b GKH |
197 | static ssize_t server_monitor_latency_show(struct device *dev, |
198 | struct device_attribute *dev_attr, | |
199 | char *buf) | |
200 | { | |
201 | struct hv_device *hv_dev = device_to_hv_device(dev); | |
202 | ||
203 | if (!hv_dev->channel) | |
204 | return -ENODEV; | |
205 | return sprintf(buf, "%d\n", | |
206 | channel_latency(hv_dev->channel, | |
207 | vmbus_connection.monitor_pages[0])); | |
208 | } | |
209 | static DEVICE_ATTR_RO(server_monitor_latency); | |
210 | ||
211 | static ssize_t client_monitor_latency_show(struct device *dev, | |
212 | struct device_attribute *dev_attr, | |
213 | char *buf) | |
214 | { | |
215 | struct hv_device *hv_dev = device_to_hv_device(dev); | |
216 | ||
217 | if (!hv_dev->channel) | |
218 | return -ENODEV; | |
219 | return sprintf(buf, "%d\n", | |
220 | channel_latency(hv_dev->channel, | |
221 | vmbus_connection.monitor_pages[1])); | |
222 | } | |
223 | static DEVICE_ATTR_RO(client_monitor_latency); | |
224 | ||
4947c745 GKH |
225 | static ssize_t server_monitor_conn_id_show(struct device *dev, |
226 | struct device_attribute *dev_attr, | |
227 | char *buf) | |
228 | { | |
229 | struct hv_device *hv_dev = device_to_hv_device(dev); | |
230 | ||
231 | if (!hv_dev->channel) | |
232 | return -ENODEV; | |
233 | return sprintf(buf, "%d\n", | |
234 | channel_conn_id(hv_dev->channel, | |
235 | vmbus_connection.monitor_pages[0])); | |
236 | } | |
237 | static DEVICE_ATTR_RO(server_monitor_conn_id); | |
238 | ||
239 | static ssize_t client_monitor_conn_id_show(struct device *dev, | |
240 | struct device_attribute *dev_attr, | |
241 | char *buf) | |
242 | { | |
243 | struct hv_device *hv_dev = device_to_hv_device(dev); | |
244 | ||
245 | if (!hv_dev->channel) | |
246 | return -ENODEV; | |
247 | return sprintf(buf, "%d\n", | |
248 | channel_conn_id(hv_dev->channel, | |
249 | vmbus_connection.monitor_pages[1])); | |
250 | } | |
251 | static DEVICE_ATTR_RO(client_monitor_conn_id); | |
252 | ||
98f4c651 GKH |
253 | static ssize_t out_intr_mask_show(struct device *dev, |
254 | struct device_attribute *dev_attr, char *buf) | |
255 | { | |
256 | struct hv_device *hv_dev = device_to_hv_device(dev); | |
257 | struct hv_ring_buffer_debug_info outbound; | |
258 | ||
259 | if (!hv_dev->channel) | |
260 | return -ENODEV; | |
261 | hv_ringbuffer_get_debuginfo(&hv_dev->channel->outbound, &outbound); | |
262 | return sprintf(buf, "%d\n", outbound.current_interrupt_mask); | |
263 | } | |
264 | static DEVICE_ATTR_RO(out_intr_mask); | |
265 | ||
266 | static ssize_t out_read_index_show(struct device *dev, | |
267 | struct device_attribute *dev_attr, char *buf) | |
268 | { | |
269 | struct hv_device *hv_dev = device_to_hv_device(dev); | |
270 | struct hv_ring_buffer_debug_info outbound; | |
271 | ||
272 | if (!hv_dev->channel) | |
273 | return -ENODEV; | |
274 | hv_ringbuffer_get_debuginfo(&hv_dev->channel->outbound, &outbound); | |
275 | return sprintf(buf, "%d\n", outbound.current_read_index); | |
276 | } | |
277 | static DEVICE_ATTR_RO(out_read_index); | |
278 | ||
279 | static ssize_t out_write_index_show(struct device *dev, | |
280 | struct device_attribute *dev_attr, | |
281 | char *buf) | |
282 | { | |
283 | struct hv_device *hv_dev = device_to_hv_device(dev); | |
284 | struct hv_ring_buffer_debug_info outbound; | |
285 | ||
286 | if (!hv_dev->channel) | |
287 | return -ENODEV; | |
288 | hv_ringbuffer_get_debuginfo(&hv_dev->channel->outbound, &outbound); | |
289 | return sprintf(buf, "%d\n", outbound.current_write_index); | |
290 | } | |
291 | static DEVICE_ATTR_RO(out_write_index); | |
292 | ||
293 | static ssize_t out_read_bytes_avail_show(struct device *dev, | |
294 | struct device_attribute *dev_attr, | |
295 | char *buf) | |
296 | { | |
297 | struct hv_device *hv_dev = device_to_hv_device(dev); | |
298 | struct hv_ring_buffer_debug_info outbound; | |
299 | ||
300 | if (!hv_dev->channel) | |
301 | return -ENODEV; | |
302 | hv_ringbuffer_get_debuginfo(&hv_dev->channel->outbound, &outbound); | |
303 | return sprintf(buf, "%d\n", outbound.bytes_avail_toread); | |
304 | } | |
305 | static DEVICE_ATTR_RO(out_read_bytes_avail); | |
306 | ||
307 | static ssize_t out_write_bytes_avail_show(struct device *dev, | |
308 | struct device_attribute *dev_attr, | |
309 | char *buf) | |
310 | { | |
311 | struct hv_device *hv_dev = device_to_hv_device(dev); | |
312 | struct hv_ring_buffer_debug_info outbound; | |
313 | ||
314 | if (!hv_dev->channel) | |
315 | return -ENODEV; | |
316 | hv_ringbuffer_get_debuginfo(&hv_dev->channel->outbound, &outbound); | |
317 | return sprintf(buf, "%d\n", outbound.bytes_avail_towrite); | |
318 | } | |
319 | static DEVICE_ATTR_RO(out_write_bytes_avail); | |
320 | ||
321 | static ssize_t in_intr_mask_show(struct device *dev, | |
322 | struct device_attribute *dev_attr, char *buf) | |
323 | { | |
324 | struct hv_device *hv_dev = device_to_hv_device(dev); | |
325 | struct hv_ring_buffer_debug_info inbound; | |
326 | ||
327 | if (!hv_dev->channel) | |
328 | return -ENODEV; | |
329 | hv_ringbuffer_get_debuginfo(&hv_dev->channel->inbound, &inbound); | |
330 | return sprintf(buf, "%d\n", inbound.current_interrupt_mask); | |
331 | } | |
332 | static DEVICE_ATTR_RO(in_intr_mask); | |
333 | ||
334 | static ssize_t in_read_index_show(struct device *dev, | |
335 | struct device_attribute *dev_attr, char *buf) | |
336 | { | |
337 | struct hv_device *hv_dev = device_to_hv_device(dev); | |
338 | struct hv_ring_buffer_debug_info inbound; | |
339 | ||
340 | if (!hv_dev->channel) | |
341 | return -ENODEV; | |
342 | hv_ringbuffer_get_debuginfo(&hv_dev->channel->inbound, &inbound); | |
343 | return sprintf(buf, "%d\n", inbound.current_read_index); | |
344 | } | |
345 | static DEVICE_ATTR_RO(in_read_index); | |
346 | ||
347 | static ssize_t in_write_index_show(struct device *dev, | |
348 | struct device_attribute *dev_attr, char *buf) | |
349 | { | |
350 | struct hv_device *hv_dev = device_to_hv_device(dev); | |
351 | struct hv_ring_buffer_debug_info inbound; | |
352 | ||
353 | if (!hv_dev->channel) | |
354 | return -ENODEV; | |
355 | hv_ringbuffer_get_debuginfo(&hv_dev->channel->inbound, &inbound); | |
356 | return sprintf(buf, "%d\n", inbound.current_write_index); | |
357 | } | |
358 | static DEVICE_ATTR_RO(in_write_index); | |
359 | ||
360 | static ssize_t in_read_bytes_avail_show(struct device *dev, | |
361 | struct device_attribute *dev_attr, | |
362 | char *buf) | |
363 | { | |
364 | struct hv_device *hv_dev = device_to_hv_device(dev); | |
365 | struct hv_ring_buffer_debug_info inbound; | |
366 | ||
367 | if (!hv_dev->channel) | |
368 | return -ENODEV; | |
369 | hv_ringbuffer_get_debuginfo(&hv_dev->channel->inbound, &inbound); | |
370 | return sprintf(buf, "%d\n", inbound.bytes_avail_toread); | |
371 | } | |
372 | static DEVICE_ATTR_RO(in_read_bytes_avail); | |
373 | ||
374 | static ssize_t in_write_bytes_avail_show(struct device *dev, | |
375 | struct device_attribute *dev_attr, | |
376 | char *buf) | |
377 | { | |
378 | struct hv_device *hv_dev = device_to_hv_device(dev); | |
379 | struct hv_ring_buffer_debug_info inbound; | |
380 | ||
381 | if (!hv_dev->channel) | |
382 | return -ENODEV; | |
383 | hv_ringbuffer_get_debuginfo(&hv_dev->channel->inbound, &inbound); | |
384 | return sprintf(buf, "%d\n", inbound.bytes_avail_towrite); | |
385 | } | |
386 | static DEVICE_ATTR_RO(in_write_bytes_avail); | |
387 | ||
388 | /* Set up per device attributes in /sys/bus/vmbus/devices/<bus device> */ | |
03f3a910 GKH |
389 | static struct attribute *vmbus_attrs[] = { |
390 | &dev_attr_id.attr, | |
a8fb5f3d | 391 | &dev_attr_state.attr, |
5ffd00e2 | 392 | &dev_attr_monitor_id.attr, |
68234c04 | 393 | &dev_attr_class_id.attr, |
7c55e1d0 | 394 | &dev_attr_device_id.attr, |
647fa371 | 395 | &dev_attr_modalias.attr, |
76c52bbe GKH |
396 | &dev_attr_server_monitor_pending.attr, |
397 | &dev_attr_client_monitor_pending.attr, | |
1cee272b GKH |
398 | &dev_attr_server_monitor_latency.attr, |
399 | &dev_attr_client_monitor_latency.attr, | |
4947c745 GKH |
400 | &dev_attr_server_monitor_conn_id.attr, |
401 | &dev_attr_client_monitor_conn_id.attr, | |
98f4c651 GKH |
402 | &dev_attr_out_intr_mask.attr, |
403 | &dev_attr_out_read_index.attr, | |
404 | &dev_attr_out_write_index.attr, | |
405 | &dev_attr_out_read_bytes_avail.attr, | |
406 | &dev_attr_out_write_bytes_avail.attr, | |
407 | &dev_attr_in_intr_mask.attr, | |
408 | &dev_attr_in_read_index.attr, | |
409 | &dev_attr_in_write_index.attr, | |
410 | &dev_attr_in_read_bytes_avail.attr, | |
411 | &dev_attr_in_write_bytes_avail.attr, | |
03f3a910 GKH |
412 | NULL, |
413 | }; | |
414 | ATTRIBUTE_GROUPS(vmbus); | |
415 | ||
adde2487 S |
416 | /* |
417 | * vmbus_uevent - add uevent for our device | |
418 | * | |
419 | * This routine is invoked when a device is added or removed on the vmbus to | |
420 | * generate a uevent to udev in the userspace. The udev will then look at its | |
421 | * rule and the uevent generated here to load the appropriate driver | |
0ddda660 S |
422 | * |
423 | * The alias string will be of the form vmbus:guid where guid is the string | |
424 | * representation of the device guid (each byte of the guid will be | |
425 | * represented with two hex characters. | |
adde2487 S |
426 | */ |
427 | static int vmbus_uevent(struct device *device, struct kobj_uevent_env *env) | |
428 | { | |
429 | struct hv_device *dev = device_to_hv_device(device); | |
fd776ba9 OH |
430 | int ret; |
431 | char alias_name[VMBUS_ALIAS_LEN + 1]; | |
0ddda660 | 432 | |
fd776ba9 | 433 | print_alias_name(dev, alias_name); |
0ddda660 S |
434 | ret = add_uevent_var(env, "MODALIAS=vmbus:%s", alias_name); |
435 | return ret; | |
adde2487 S |
436 | } |
437 | ||
1b9d48f2 | 438 | static const uuid_le null_guid; |
5841a829 S |
439 | |
440 | static inline bool is_null_guid(const __u8 *guid) | |
441 | { | |
442 | if (memcmp(guid, &null_guid, sizeof(uuid_le))) | |
443 | return false; | |
444 | return true; | |
445 | } | |
446 | ||
3037a7b6 S |
447 | /* |
448 | * Return a matching hv_vmbus_device_id pointer. | |
449 | * If there is no match, return NULL. | |
450 | */ | |
451 | static const struct hv_vmbus_device_id *hv_vmbus_get_id( | |
452 | const struct hv_vmbus_device_id *id, | |
1b9d48f2 | 453 | const __u8 *guid) |
3037a7b6 S |
454 | { |
455 | for (; !is_null_guid(id->guid); id++) | |
456 | if (!memcmp(&id->guid, guid, sizeof(uuid_le))) | |
457 | return id; | |
458 | ||
459 | return NULL; | |
460 | } | |
461 | ||
462 | ||
b7fc147b S |
463 | |
464 | /* | |
465 | * vmbus_match - Attempt to match the specified device to the specified driver | |
466 | */ | |
467 | static int vmbus_match(struct device *device, struct device_driver *driver) | |
468 | { | |
b7fc147b | 469 | struct hv_driver *drv = drv_to_hv_drv(driver); |
e8e27047 | 470 | struct hv_device *hv_dev = device_to_hv_device(device); |
b7fc147b | 471 | |
3037a7b6 S |
472 | if (hv_vmbus_get_id(drv->id_table, hv_dev->dev_type.b)) |
473 | return 1; | |
de632a2b | 474 | |
5841a829 | 475 | return 0; |
b7fc147b S |
476 | } |
477 | ||
f1f0d67b S |
478 | /* |
479 | * vmbus_probe - Add the new vmbus's child device | |
480 | */ | |
481 | static int vmbus_probe(struct device *child_device) | |
482 | { | |
483 | int ret = 0; | |
484 | struct hv_driver *drv = | |
485 | drv_to_hv_drv(child_device->driver); | |
9efd21e1 | 486 | struct hv_device *dev = device_to_hv_device(child_device); |
84946899 | 487 | const struct hv_vmbus_device_id *dev_id; |
f1f0d67b | 488 | |
84946899 | 489 | dev_id = hv_vmbus_get_id(drv->id_table, dev->dev_type.b); |
9efd21e1 | 490 | if (drv->probe) { |
84946899 | 491 | ret = drv->probe(dev, dev_id); |
b14a7b30 | 492 | if (ret != 0) |
0a46618d HJ |
493 | pr_err("probe failed for device %s (%d)\n", |
494 | dev_name(child_device), ret); | |
f1f0d67b | 495 | |
f1f0d67b | 496 | } else { |
0a46618d HJ |
497 | pr_err("probe not set for driver %s\n", |
498 | dev_name(child_device)); | |
6de925b1 | 499 | ret = -ENODEV; |
f1f0d67b S |
500 | } |
501 | return ret; | |
502 | } | |
503 | ||
c5dce3db S |
504 | /* |
505 | * vmbus_remove - Remove a vmbus device | |
506 | */ | |
507 | static int vmbus_remove(struct device *child_device) | |
508 | { | |
d4372179 | 509 | struct hv_driver *drv = drv_to_hv_drv(child_device->driver); |
415b023a | 510 | struct hv_device *dev = device_to_hv_device(child_device); |
c5dce3db | 511 | |
d4372179 S |
512 | if (drv->remove) |
513 | drv->remove(dev); | |
514 | else | |
515 | pr_err("remove not set for driver %s\n", | |
516 | dev_name(child_device)); | |
c5dce3db S |
517 | |
518 | return 0; | |
519 | } | |
520 | ||
eb1bb259 S |
521 | |
522 | /* | |
523 | * vmbus_shutdown - Shutdown a vmbus device | |
524 | */ | |
525 | static void vmbus_shutdown(struct device *child_device) | |
526 | { | |
527 | struct hv_driver *drv; | |
ca6887fb | 528 | struct hv_device *dev = device_to_hv_device(child_device); |
eb1bb259 S |
529 | |
530 | ||
531 | /* The device may not be attached yet */ | |
532 | if (!child_device->driver) | |
533 | return; | |
534 | ||
535 | drv = drv_to_hv_drv(child_device->driver); | |
536 | ||
ca6887fb S |
537 | if (drv->shutdown) |
538 | drv->shutdown(dev); | |
eb1bb259 S |
539 | |
540 | return; | |
541 | } | |
542 | ||
086e7a56 S |
543 | |
544 | /* | |
545 | * vmbus_device_release - Final callback release of the vmbus child device | |
546 | */ | |
547 | static void vmbus_device_release(struct device *device) | |
548 | { | |
e8e27047 | 549 | struct hv_device *hv_dev = device_to_hv_device(device); |
086e7a56 | 550 | |
e8e27047 | 551 | kfree(hv_dev); |
086e7a56 S |
552 | |
553 | } | |
554 | ||
454f18a9 | 555 | /* The one and only one */ |
9adcac5c S |
556 | static struct bus_type hv_bus = { |
557 | .name = "vmbus", | |
558 | .match = vmbus_match, | |
559 | .shutdown = vmbus_shutdown, | |
560 | .remove = vmbus_remove, | |
561 | .probe = vmbus_probe, | |
562 | .uevent = vmbus_uevent, | |
03f3a910 | 563 | .dev_groups = vmbus_groups, |
3e7ee490 HJ |
564 | }; |
565 | ||
bf6506f6 TT |
566 | struct onmessage_work_context { |
567 | struct work_struct work; | |
568 | struct hv_message msg; | |
569 | }; | |
570 | ||
571 | static void vmbus_onmessage_work(struct work_struct *work) | |
572 | { | |
573 | struct onmessage_work_context *ctx; | |
574 | ||
575 | ctx = container_of(work, struct onmessage_work_context, | |
576 | work); | |
577 | vmbus_onmessage(&ctx->msg); | |
578 | kfree(ctx); | |
579 | } | |
580 | ||
62c1059d | 581 | static void vmbus_on_msg_dpc(unsigned long data) |
36199a99 GKH |
582 | { |
583 | int cpu = smp_processor_id(); | |
584 | void *page_addr = hv_context.synic_message_page[cpu]; | |
585 | struct hv_message *msg = (struct hv_message *)page_addr + | |
586 | VMBUS_MESSAGE_SINT; | |
bf6506f6 | 587 | struct onmessage_work_context *ctx; |
36199a99 GKH |
588 | |
589 | while (1) { | |
590 | if (msg->header.message_type == HVMSG_NONE) { | |
591 | /* no msg */ | |
592 | break; | |
593 | } else { | |
bf6506f6 TT |
594 | ctx = kmalloc(sizeof(*ctx), GFP_ATOMIC); |
595 | if (ctx == NULL) | |
36199a99 | 596 | continue; |
bf6506f6 TT |
597 | INIT_WORK(&ctx->work, vmbus_onmessage_work); |
598 | memcpy(&ctx->msg, msg, sizeof(*msg)); | |
da9fcb72 | 599 | queue_work(vmbus_connection.work_queue, &ctx->work); |
36199a99 GKH |
600 | } |
601 | ||
602 | msg->header.message_type = HVMSG_NONE; | |
603 | ||
604 | /* | |
605 | * Make sure the write to MessageType (ie set to | |
606 | * HVMSG_NONE) happens before we read the | |
607 | * MessagePending and EOMing. Otherwise, the EOMing | |
608 | * will not deliver any more messages since there is | |
609 | * no empty slot | |
610 | */ | |
35848f68 | 611 | mb(); |
36199a99 GKH |
612 | |
613 | if (msg->header.message_flags.msg_pending) { | |
614 | /* | |
615 | * This will cause message queue rescan to | |
616 | * possibly deliver another msg from the | |
617 | * hypervisor | |
618 | */ | |
619 | wrmsrl(HV_X64_MSR_EOM, 0); | |
620 | } | |
621 | } | |
622 | } | |
623 | ||
76d388cd | 624 | static void vmbus_isr(void) |
36199a99 | 625 | { |
36199a99 GKH |
626 | int cpu = smp_processor_id(); |
627 | void *page_addr; | |
628 | struct hv_message *msg; | |
629 | union hv_synic_event_flags *event; | |
ae4636e6 | 630 | bool handled = false; |
36199a99 | 631 | |
5ab05951 S |
632 | page_addr = hv_context.synic_event_page[cpu]; |
633 | if (page_addr == NULL) | |
76d388cd | 634 | return; |
5ab05951 S |
635 | |
636 | event = (union hv_synic_event_flags *)page_addr + | |
637 | VMBUS_MESSAGE_SINT; | |
7341d908 S |
638 | /* |
639 | * Check for events before checking for messages. This is the order | |
640 | * in which events and messages are checked in Windows guests on | |
641 | * Hyper-V, and the Windows team suggested we do the same. | |
642 | */ | |
36199a99 | 643 | |
6552ecd7 S |
644 | if ((vmbus_proto_version == VERSION_WS2008) || |
645 | (vmbus_proto_version == VERSION_WIN7)) { | |
36199a99 | 646 | |
6552ecd7 S |
647 | /* Since we are a child, we only need to check bit 0 */ |
648 | if (sync_test_and_clear_bit(0, | |
649 | (unsigned long *) &event->flags32[0])) { | |
650 | handled = true; | |
651 | } | |
652 | } else { | |
653 | /* | |
654 | * Our host is win8 or above. The signaling mechanism | |
655 | * has changed and we can directly look at the event page. | |
656 | * If bit n is set then we have an interrup on the channel | |
657 | * whose id is n. | |
658 | */ | |
ae4636e6 | 659 | handled = true; |
ae4636e6 | 660 | } |
793be9c7 | 661 | |
6552ecd7 | 662 | if (handled) |
db11f12a | 663 | tasklet_schedule(hv_context.event_dpc[cpu]); |
6552ecd7 S |
664 | |
665 | ||
7341d908 S |
666 | page_addr = hv_context.synic_message_page[cpu]; |
667 | msg = (struct hv_message *)page_addr + VMBUS_MESSAGE_SINT; | |
668 | ||
669 | /* Check if there are actual msgs to be processed */ | |
76d388cd | 670 | if (msg->header.message_type != HVMSG_NONE) |
7341d908 | 671 | tasklet_schedule(&msg_dpc); |
793be9c7 S |
672 | } |
673 | ||
3e189519 | 674 | /* |
90c9960e GKH |
675 | * vmbus_bus_init -Main vmbus driver initialization routine. |
676 | * | |
677 | * Here, we | |
0686e4f4 | 678 | * - initialize the vmbus driver context |
0686e4f4 LL |
679 | * - invoke the vmbus hv main init routine |
680 | * - get the irq resource | |
0686e4f4 | 681 | * - retrieve the channel offers |
90c9960e | 682 | */ |
9aaa995e | 683 | static int vmbus_bus_init(int irq) |
3e7ee490 | 684 | { |
90c9960e | 685 | int ret; |
3e7ee490 | 686 | |
6d26e38f GKH |
687 | /* Hypervisor initialization...setup hypercall page..etc */ |
688 | ret = hv_init(); | |
90c9960e | 689 | if (ret != 0) { |
0a46618d | 690 | pr_err("Unable to initialize the hypervisor - 0x%x\n", ret); |
d6c1c5de | 691 | return ret; |
3e7ee490 HJ |
692 | } |
693 | ||
59c0e4f0 | 694 | tasklet_init(&msg_dpc, vmbus_on_msg_dpc, 0); |
3e7ee490 | 695 | |
9adcac5c | 696 | ret = bus_register(&hv_bus); |
d6c1c5de | 697 | if (ret) |
8b9987e9 | 698 | goto err_cleanup; |
3e7ee490 | 699 | |
76d388cd | 700 | hv_setup_vmbus_irq(vmbus_isr); |
3e7ee490 | 701 | |
2608fb65 JW |
702 | ret = hv_synic_alloc(); |
703 | if (ret) | |
704 | goto err_alloc; | |
800b6902 | 705 | /* |
302a3c0f | 706 | * Initialize the per-cpu interrupt state and |
800b6902 S |
707 | * connect to the host. |
708 | */ | |
302a3c0f | 709 | on_each_cpu(hv_synic_init, NULL, 1); |
800b6902 | 710 | ret = vmbus_connect(); |
8b9987e9 | 711 | if (ret) |
2608fb65 | 712 | goto err_alloc; |
800b6902 | 713 | |
2d6e882b | 714 | vmbus_request_offers(); |
8b5d6d3b | 715 | |
d6c1c5de | 716 | return 0; |
8b9987e9 | 717 | |
2608fb65 JW |
718 | err_alloc: |
719 | hv_synic_free(); | |
76d388cd | 720 | hv_remove_vmbus_irq(); |
8b9987e9 | 721 | |
8b9987e9 S |
722 | bus_unregister(&hv_bus); |
723 | ||
724 | err_cleanup: | |
725 | hv_cleanup(); | |
726 | ||
727 | return ret; | |
3e7ee490 HJ |
728 | } |
729 | ||
90c9960e | 730 | /** |
768fa219 GKH |
731 | * __vmbus_child_driver_register - Register a vmbus's driver |
732 | * @drv: Pointer to driver structure you want to register | |
733 | * @owner: owner module of the drv | |
734 | * @mod_name: module name string | |
3e189519 HJ |
735 | * |
736 | * Registers the given driver with Linux through the 'driver_register()' call | |
768fa219 | 737 | * and sets up the hyper-v vmbus handling for this driver. |
3e189519 HJ |
738 | * It will return the state of the 'driver_register()' call. |
739 | * | |
90c9960e | 740 | */ |
768fa219 | 741 | int __vmbus_driver_register(struct hv_driver *hv_driver, struct module *owner, const char *mod_name) |
3e7ee490 | 742 | { |
5d48a1c2 | 743 | int ret; |
3e7ee490 | 744 | |
768fa219 | 745 | pr_info("registering driver %s\n", hv_driver->name); |
3e7ee490 | 746 | |
cf6a2eac S |
747 | ret = vmbus_exists(); |
748 | if (ret < 0) | |
749 | return ret; | |
750 | ||
768fa219 GKH |
751 | hv_driver->driver.name = hv_driver->name; |
752 | hv_driver->driver.owner = owner; | |
753 | hv_driver->driver.mod_name = mod_name; | |
754 | hv_driver->driver.bus = &hv_bus; | |
3e7ee490 | 755 | |
768fa219 | 756 | ret = driver_register(&hv_driver->driver); |
3e7ee490 | 757 | |
5d48a1c2 | 758 | return ret; |
3e7ee490 | 759 | } |
768fa219 | 760 | EXPORT_SYMBOL_GPL(__vmbus_driver_register); |
3e7ee490 | 761 | |
90c9960e | 762 | /** |
768fa219 GKH |
763 | * vmbus_driver_unregister() - Unregister a vmbus's driver |
764 | * @drv: Pointer to driver structure you want to un-register | |
3e189519 | 765 | * |
768fa219 GKH |
766 | * Un-register the given driver that was previous registered with a call to |
767 | * vmbus_driver_register() | |
90c9960e | 768 | */ |
768fa219 | 769 | void vmbus_driver_unregister(struct hv_driver *hv_driver) |
3e7ee490 | 770 | { |
768fa219 | 771 | pr_info("unregistering driver %s\n", hv_driver->name); |
3e7ee490 | 772 | |
cf6a2eac | 773 | if (!vmbus_exists()) |
8f257a14 | 774 | driver_unregister(&hv_driver->driver); |
3e7ee490 | 775 | } |
768fa219 | 776 | EXPORT_SYMBOL_GPL(vmbus_driver_unregister); |
3e7ee490 | 777 | |
3e189519 | 778 | /* |
f2c73011 | 779 | * vmbus_device_create - Creates and registers a new child device |
3e189519 | 780 | * on the vmbus. |
90c9960e | 781 | */ |
1b9d48f2 | 782 | struct hv_device *vmbus_device_create(const uuid_le *type, |
783 | const uuid_le *instance, | |
784 | struct vmbus_channel *channel) | |
3e7ee490 | 785 | { |
3d3b5518 | 786 | struct hv_device *child_device_obj; |
3e7ee490 | 787 | |
6bad88da S |
788 | child_device_obj = kzalloc(sizeof(struct hv_device), GFP_KERNEL); |
789 | if (!child_device_obj) { | |
0a46618d | 790 | pr_err("Unable to allocate device object for child device\n"); |
3e7ee490 HJ |
791 | return NULL; |
792 | } | |
793 | ||
cae5b843 | 794 | child_device_obj->channel = channel; |
358d2ee2 | 795 | memcpy(&child_device_obj->dev_type, type, sizeof(uuid_le)); |
ca623ad3 | 796 | memcpy(&child_device_obj->dev_instance, instance, |
358d2ee2 | 797 | sizeof(uuid_le)); |
3e7ee490 | 798 | |
3e7ee490 | 799 | |
3e7ee490 HJ |
800 | return child_device_obj; |
801 | } | |
802 | ||
3e189519 | 803 | /* |
22794281 | 804 | * vmbus_device_register - Register the child device |
90c9960e | 805 | */ |
22794281 | 806 | int vmbus_device_register(struct hv_device *child_device_obj) |
3e7ee490 | 807 | { |
90c9960e | 808 | int ret = 0; |
6bad88da | 809 | |
f4888417 | 810 | static atomic_t device_num = ATOMIC_INIT(0); |
3e7ee490 | 811 | |
6bad88da | 812 | dev_set_name(&child_device_obj->device, "vmbus_0_%d", |
90c9960e | 813 | atomic_inc_return(&device_num)); |
3e7ee490 | 814 | |
0bce28b6 | 815 | child_device_obj->device.bus = &hv_bus; |
607c1a11 | 816 | child_device_obj->device.parent = &hv_acpi_dev->dev; |
6bad88da | 817 | child_device_obj->device.release = vmbus_device_release; |
3e7ee490 | 818 | |
90c9960e GKH |
819 | /* |
820 | * Register with the LDM. This will kick off the driver/device | |
821 | * binding...which will eventually call vmbus_match() and vmbus_probe() | |
822 | */ | |
6bad88da | 823 | ret = device_register(&child_device_obj->device); |
3e7ee490 | 824 | |
3e7ee490 | 825 | if (ret) |
0a46618d | 826 | pr_err("Unable to register child device\n"); |
3e7ee490 | 827 | else |
84672369 | 828 | pr_debug("child device %s registered\n", |
0a46618d | 829 | dev_name(&child_device_obj->device)); |
3e7ee490 | 830 | |
3e7ee490 HJ |
831 | return ret; |
832 | } | |
833 | ||
3e189519 | 834 | /* |
696453ba | 835 | * vmbus_device_unregister - Remove the specified child device |
3e189519 | 836 | * from the vmbus. |
90c9960e | 837 | */ |
696453ba | 838 | void vmbus_device_unregister(struct hv_device *device_obj) |
3e7ee490 | 839 | { |
84672369 FS |
840 | pr_debug("child device %s unregistered\n", |
841 | dev_name(&device_obj->device)); | |
842 | ||
90c9960e GKH |
843 | /* |
844 | * Kick off the process of unregistering the device. | |
845 | * This will call vmbus_remove() and eventually vmbus_device_release() | |
846 | */ | |
6bad88da | 847 | device_unregister(&device_obj->device); |
3e7ee490 HJ |
848 | } |
849 | ||
3e7ee490 | 850 | |
b0069f43 | 851 | /* |
90f34535 S |
852 | * VMBUS is an acpi enumerated device. Get the the information we |
853 | * need from DSDT. | |
b0069f43 S |
854 | */ |
855 | ||
90f34535 | 856 | static acpi_status vmbus_walk_resources(struct acpi_resource *res, void *ctx) |
b0069f43 | 857 | { |
90f34535 S |
858 | switch (res->type) { |
859 | case ACPI_RESOURCE_TYPE_IRQ: | |
860 | irq = res->data.irq.interrupts[0]; | |
4eb923f8 | 861 | break; |
b0069f43 | 862 | |
90f34535 | 863 | case ACPI_RESOURCE_TYPE_ADDRESS64: |
90eedf0c GH |
864 | hyperv_mmio.start = res->data.address64.minimum; |
865 | hyperv_mmio.end = res->data.address64.maximum; | |
4eb923f8 | 866 | break; |
b0069f43 S |
867 | } |
868 | ||
869 | return AE_OK; | |
870 | } | |
871 | ||
872 | static int vmbus_acpi_add(struct acpi_device *device) | |
873 | { | |
874 | acpi_status result; | |
90f34535 | 875 | int ret_val = -ENODEV; |
b0069f43 | 876 | |
607c1a11 S |
877 | hv_acpi_dev = device; |
878 | ||
0a4425b6 | 879 | result = acpi_walk_resources(device->handle, METHOD_NAME__CRS, |
90f34535 | 880 | vmbus_walk_resources, NULL); |
b0069f43 | 881 | |
90f34535 S |
882 | if (ACPI_FAILURE(result)) |
883 | goto acpi_walk_err; | |
884 | /* | |
885 | * The parent of the vmbus acpi device (Gen2 firmware) is the VMOD that | |
886 | * has the mmio ranges. Get that. | |
887 | */ | |
888 | if (device->parent) { | |
889 | result = acpi_walk_resources(device->parent->handle, | |
890 | METHOD_NAME__CRS, | |
891 | vmbus_walk_resources, NULL); | |
892 | ||
893 | if (ACPI_FAILURE(result)) | |
894 | goto acpi_walk_err; | |
90eedf0c GH |
895 | if (hyperv_mmio.start && hyperv_mmio.end) |
896 | request_resource(&iomem_resource, &hyperv_mmio); | |
b0069f43 | 897 | } |
90f34535 S |
898 | ret_val = 0; |
899 | ||
900 | acpi_walk_err: | |
b0069f43 | 901 | complete(&probe_event); |
90f34535 | 902 | return ret_val; |
b0069f43 S |
903 | } |
904 | ||
905 | static const struct acpi_device_id vmbus_acpi_device_ids[] = { | |
906 | {"VMBUS", 0}, | |
9d7b18d1 | 907 | {"VMBus", 0}, |
b0069f43 S |
908 | {"", 0}, |
909 | }; | |
910 | MODULE_DEVICE_TABLE(acpi, vmbus_acpi_device_ids); | |
911 | ||
912 | static struct acpi_driver vmbus_acpi_driver = { | |
913 | .name = "vmbus", | |
914 | .ids = vmbus_acpi_device_ids, | |
915 | .ops = { | |
916 | .add = vmbus_acpi_add, | |
917 | }, | |
918 | }; | |
919 | ||
607c1a11 | 920 | static int __init hv_acpi_init(void) |
1168ac22 | 921 | { |
2dda95f8 | 922 | int ret, t; |
b0069f43 | 923 | |
1f94ea81 | 924 | if (x86_hyper != &x86_hyper_ms_hyperv) |
0592969e JW |
925 | return -ENODEV; |
926 | ||
b0069f43 S |
927 | init_completion(&probe_event); |
928 | ||
929 | /* | |
930 | * Get irq resources first. | |
931 | */ | |
0246604c S |
932 | ret = acpi_bus_register_driver(&vmbus_acpi_driver); |
933 | ||
b0069f43 S |
934 | if (ret) |
935 | return ret; | |
936 | ||
2dda95f8 S |
937 | t = wait_for_completion_timeout(&probe_event, 5*HZ); |
938 | if (t == 0) { | |
939 | ret = -ETIMEDOUT; | |
940 | goto cleanup; | |
941 | } | |
b0069f43 S |
942 | |
943 | if (irq <= 0) { | |
2dda95f8 S |
944 | ret = -ENODEV; |
945 | goto cleanup; | |
b0069f43 S |
946 | } |
947 | ||
91fd799e S |
948 | ret = vmbus_bus_init(irq); |
949 | if (ret) | |
2dda95f8 S |
950 | goto cleanup; |
951 | ||
952 | return 0; | |
953 | ||
954 | cleanup: | |
955 | acpi_bus_unregister_driver(&vmbus_acpi_driver); | |
cf6a2eac | 956 | hv_acpi_dev = NULL; |
91fd799e | 957 | return ret; |
1168ac22 S |
958 | } |
959 | ||
93e5bd06 S |
960 | static void __exit vmbus_exit(void) |
961 | { | |
76d388cd | 962 | hv_remove_vmbus_irq(); |
93e5bd06 S |
963 | vmbus_free_channels(); |
964 | bus_unregister(&hv_bus); | |
965 | hv_cleanup(); | |
966 | acpi_bus_unregister_driver(&vmbus_acpi_driver); | |
967 | } | |
968 | ||
1168ac22 | 969 | |
90c9960e | 970 | MODULE_LICENSE("GPL"); |
3e7ee490 | 971 | |
43d4e119 | 972 | subsys_initcall(hv_acpi_init); |
93e5bd06 | 973 | module_exit(vmbus_exit); |