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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> | |
28 | #include <linux/irq.h> | |
29 | #include <linux/interrupt.h> | |
30 | #include <linux/sysctl.h> | |
5a0e3ad6 | 31 | #include <linux/slab.h> |
b0069f43 | 32 | #include <linux/acpi.h> |
8b5d6d3b | 33 | #include <linux/completion.h> |
46a97191 | 34 | #include <linux/hyperv.h> |
b0209501 | 35 | #include <linux/kernel_stat.h> |
407dd164 | 36 | #include <asm/hyperv.h> |
1f94ea81 | 37 | #include <asm/hypervisor.h> |
302a3c0f | 38 | #include <asm/mshyperv.h> |
0f2a6619 | 39 | #include "hyperv_vmbus.h" |
3e7ee490 | 40 | |
607c1a11 | 41 | static struct acpi_device *hv_acpi_dev; |
1168ac22 | 42 | |
59c0e4f0 | 43 | static struct tasklet_struct msg_dpc; |
71a6655d | 44 | static struct completion probe_event; |
b0069f43 | 45 | static int irq; |
90f34535 S |
46 | u64 hyperv_mmio_start; |
47 | EXPORT_SYMBOL_GPL(hyperv_mmio_start); | |
48 | u64 hyperv_mmio_size; | |
49 | EXPORT_SYMBOL_GPL(hyperv_mmio_size); | |
98db4335 | 50 | |
cf6a2eac S |
51 | static int vmbus_exists(void) |
52 | { | |
53 | if (hv_acpi_dev == NULL) | |
54 | return -ENODEV; | |
55 | ||
56 | return 0; | |
57 | } | |
58 | ||
fd776ba9 OH |
59 | #define VMBUS_ALIAS_LEN ((sizeof((struct hv_vmbus_device_id *)0)->guid) * 2) |
60 | static void print_alias_name(struct hv_device *hv_dev, char *alias_name) | |
61 | { | |
62 | int i; | |
63 | for (i = 0; i < VMBUS_ALIAS_LEN; i += 2) | |
64 | sprintf(&alias_name[i], "%02x", hv_dev->dev_type.b[i/2]); | |
65 | } | |
66 | ||
76c52bbe GKH |
67 | static u8 channel_monitor_group(struct vmbus_channel *channel) |
68 | { | |
69 | return (u8)channel->offermsg.monitorid / 32; | |
70 | } | |
71 | ||
72 | static u8 channel_monitor_offset(struct vmbus_channel *channel) | |
73 | { | |
74 | return (u8)channel->offermsg.monitorid % 32; | |
75 | } | |
76 | ||
77 | static u32 channel_pending(struct vmbus_channel *channel, | |
78 | struct hv_monitor_page *monitor_page) | |
79 | { | |
80 | u8 monitor_group = channel_monitor_group(channel); | |
81 | return monitor_page->trigger_group[monitor_group].pending; | |
82 | } | |
83 | ||
1cee272b GKH |
84 | static u32 channel_latency(struct vmbus_channel *channel, |
85 | struct hv_monitor_page *monitor_page) | |
86 | { | |
87 | u8 monitor_group = channel_monitor_group(channel); | |
88 | u8 monitor_offset = channel_monitor_offset(channel); | |
89 | return monitor_page->latency[monitor_group][monitor_offset]; | |
90 | } | |
91 | ||
4947c745 GKH |
92 | static u32 channel_conn_id(struct vmbus_channel *channel, |
93 | struct hv_monitor_page *monitor_page) | |
94 | { | |
95 | u8 monitor_group = channel_monitor_group(channel); | |
96 | u8 monitor_offset = channel_monitor_offset(channel); | |
97 | return monitor_page->parameter[monitor_group][monitor_offset].connectionid.u.id; | |
98 | } | |
99 | ||
03f3a910 GKH |
100 | static ssize_t id_show(struct device *dev, struct device_attribute *dev_attr, |
101 | char *buf) | |
102 | { | |
103 | struct hv_device *hv_dev = device_to_hv_device(dev); | |
104 | ||
105 | if (!hv_dev->channel) | |
106 | return -ENODEV; | |
107 | return sprintf(buf, "%d\n", hv_dev->channel->offermsg.child_relid); | |
108 | } | |
109 | static DEVICE_ATTR_RO(id); | |
110 | ||
a8fb5f3d GKH |
111 | static ssize_t state_show(struct device *dev, struct device_attribute *dev_attr, |
112 | char *buf) | |
113 | { | |
114 | struct hv_device *hv_dev = device_to_hv_device(dev); | |
115 | ||
116 | if (!hv_dev->channel) | |
117 | return -ENODEV; | |
118 | return sprintf(buf, "%d\n", hv_dev->channel->state); | |
119 | } | |
120 | static DEVICE_ATTR_RO(state); | |
121 | ||
5ffd00e2 GKH |
122 | static ssize_t monitor_id_show(struct device *dev, |
123 | struct device_attribute *dev_attr, char *buf) | |
124 | { | |
125 | struct hv_device *hv_dev = device_to_hv_device(dev); | |
126 | ||
127 | if (!hv_dev->channel) | |
128 | return -ENODEV; | |
129 | return sprintf(buf, "%d\n", hv_dev->channel->offermsg.monitorid); | |
130 | } | |
131 | static DEVICE_ATTR_RO(monitor_id); | |
132 | ||
68234c04 GKH |
133 | static ssize_t class_id_show(struct device *dev, |
134 | struct device_attribute *dev_attr, char *buf) | |
135 | { | |
136 | struct hv_device *hv_dev = device_to_hv_device(dev); | |
137 | ||
138 | if (!hv_dev->channel) | |
139 | return -ENODEV; | |
140 | return sprintf(buf, "{%pUl}\n", | |
141 | hv_dev->channel->offermsg.offer.if_type.b); | |
142 | } | |
143 | static DEVICE_ATTR_RO(class_id); | |
144 | ||
7c55e1d0 GKH |
145 | static ssize_t device_id_show(struct device *dev, |
146 | struct device_attribute *dev_attr, char *buf) | |
147 | { | |
148 | struct hv_device *hv_dev = device_to_hv_device(dev); | |
149 | ||
150 | if (!hv_dev->channel) | |
151 | return -ENODEV; | |
152 | return sprintf(buf, "{%pUl}\n", | |
153 | hv_dev->channel->offermsg.offer.if_instance.b); | |
154 | } | |
155 | static DEVICE_ATTR_RO(device_id); | |
156 | ||
647fa371 GKH |
157 | static ssize_t modalias_show(struct device *dev, |
158 | struct device_attribute *dev_attr, char *buf) | |
159 | { | |
160 | struct hv_device *hv_dev = device_to_hv_device(dev); | |
161 | char alias_name[VMBUS_ALIAS_LEN + 1]; | |
162 | ||
163 | print_alias_name(hv_dev, alias_name); | |
164 | return sprintf(buf, "vmbus:%s\n", alias_name); | |
165 | } | |
166 | static DEVICE_ATTR_RO(modalias); | |
167 | ||
76c52bbe GKH |
168 | static ssize_t server_monitor_pending_show(struct device *dev, |
169 | struct device_attribute *dev_attr, | |
170 | char *buf) | |
171 | { | |
172 | struct hv_device *hv_dev = device_to_hv_device(dev); | |
173 | ||
174 | if (!hv_dev->channel) | |
175 | return -ENODEV; | |
176 | return sprintf(buf, "%d\n", | |
177 | channel_pending(hv_dev->channel, | |
178 | vmbus_connection.monitor_pages[1])); | |
179 | } | |
180 | static DEVICE_ATTR_RO(server_monitor_pending); | |
181 | ||
182 | static ssize_t client_monitor_pending_show(struct device *dev, | |
183 | struct device_attribute *dev_attr, | |
184 | char *buf) | |
185 | { | |
186 | struct hv_device *hv_dev = device_to_hv_device(dev); | |
187 | ||
188 | if (!hv_dev->channel) | |
189 | return -ENODEV; | |
190 | return sprintf(buf, "%d\n", | |
191 | channel_pending(hv_dev->channel, | |
192 | vmbus_connection.monitor_pages[1])); | |
193 | } | |
194 | static DEVICE_ATTR_RO(client_monitor_pending); | |
68234c04 | 195 | |
1cee272b GKH |
196 | static ssize_t server_monitor_latency_show(struct device *dev, |
197 | struct device_attribute *dev_attr, | |
198 | char *buf) | |
199 | { | |
200 | struct hv_device *hv_dev = device_to_hv_device(dev); | |
201 | ||
202 | if (!hv_dev->channel) | |
203 | return -ENODEV; | |
204 | return sprintf(buf, "%d\n", | |
205 | channel_latency(hv_dev->channel, | |
206 | vmbus_connection.monitor_pages[0])); | |
207 | } | |
208 | static DEVICE_ATTR_RO(server_monitor_latency); | |
209 | ||
210 | static ssize_t client_monitor_latency_show(struct device *dev, | |
211 | struct device_attribute *dev_attr, | |
212 | char *buf) | |
213 | { | |
214 | struct hv_device *hv_dev = device_to_hv_device(dev); | |
215 | ||
216 | if (!hv_dev->channel) | |
217 | return -ENODEV; | |
218 | return sprintf(buf, "%d\n", | |
219 | channel_latency(hv_dev->channel, | |
220 | vmbus_connection.monitor_pages[1])); | |
221 | } | |
222 | static DEVICE_ATTR_RO(client_monitor_latency); | |
223 | ||
4947c745 GKH |
224 | static ssize_t server_monitor_conn_id_show(struct device *dev, |
225 | struct device_attribute *dev_attr, | |
226 | char *buf) | |
227 | { | |
228 | struct hv_device *hv_dev = device_to_hv_device(dev); | |
229 | ||
230 | if (!hv_dev->channel) | |
231 | return -ENODEV; | |
232 | return sprintf(buf, "%d\n", | |
233 | channel_conn_id(hv_dev->channel, | |
234 | vmbus_connection.monitor_pages[0])); | |
235 | } | |
236 | static DEVICE_ATTR_RO(server_monitor_conn_id); | |
237 | ||
238 | static ssize_t client_monitor_conn_id_show(struct device *dev, | |
239 | struct device_attribute *dev_attr, | |
240 | char *buf) | |
241 | { | |
242 | struct hv_device *hv_dev = device_to_hv_device(dev); | |
243 | ||
244 | if (!hv_dev->channel) | |
245 | return -ENODEV; | |
246 | return sprintf(buf, "%d\n", | |
247 | channel_conn_id(hv_dev->channel, | |
248 | vmbus_connection.monitor_pages[1])); | |
249 | } | |
250 | static DEVICE_ATTR_RO(client_monitor_conn_id); | |
251 | ||
98f4c651 GKH |
252 | static ssize_t out_intr_mask_show(struct device *dev, |
253 | struct device_attribute *dev_attr, char *buf) | |
254 | { | |
255 | struct hv_device *hv_dev = device_to_hv_device(dev); | |
256 | struct hv_ring_buffer_debug_info outbound; | |
257 | ||
258 | if (!hv_dev->channel) | |
259 | return -ENODEV; | |
260 | hv_ringbuffer_get_debuginfo(&hv_dev->channel->outbound, &outbound); | |
261 | return sprintf(buf, "%d\n", outbound.current_interrupt_mask); | |
262 | } | |
263 | static DEVICE_ATTR_RO(out_intr_mask); | |
264 | ||
265 | static ssize_t out_read_index_show(struct device *dev, | |
266 | struct device_attribute *dev_attr, char *buf) | |
267 | { | |
268 | struct hv_device *hv_dev = device_to_hv_device(dev); | |
269 | struct hv_ring_buffer_debug_info outbound; | |
270 | ||
271 | if (!hv_dev->channel) | |
272 | return -ENODEV; | |
273 | hv_ringbuffer_get_debuginfo(&hv_dev->channel->outbound, &outbound); | |
274 | return sprintf(buf, "%d\n", outbound.current_read_index); | |
275 | } | |
276 | static DEVICE_ATTR_RO(out_read_index); | |
277 | ||
278 | static ssize_t out_write_index_show(struct device *dev, | |
279 | struct device_attribute *dev_attr, | |
280 | char *buf) | |
281 | { | |
282 | struct hv_device *hv_dev = device_to_hv_device(dev); | |
283 | struct hv_ring_buffer_debug_info outbound; | |
284 | ||
285 | if (!hv_dev->channel) | |
286 | return -ENODEV; | |
287 | hv_ringbuffer_get_debuginfo(&hv_dev->channel->outbound, &outbound); | |
288 | return sprintf(buf, "%d\n", outbound.current_write_index); | |
289 | } | |
290 | static DEVICE_ATTR_RO(out_write_index); | |
291 | ||
292 | static ssize_t out_read_bytes_avail_show(struct device *dev, | |
293 | struct device_attribute *dev_attr, | |
294 | char *buf) | |
295 | { | |
296 | struct hv_device *hv_dev = device_to_hv_device(dev); | |
297 | struct hv_ring_buffer_debug_info outbound; | |
298 | ||
299 | if (!hv_dev->channel) | |
300 | return -ENODEV; | |
301 | hv_ringbuffer_get_debuginfo(&hv_dev->channel->outbound, &outbound); | |
302 | return sprintf(buf, "%d\n", outbound.bytes_avail_toread); | |
303 | } | |
304 | static DEVICE_ATTR_RO(out_read_bytes_avail); | |
305 | ||
306 | static ssize_t out_write_bytes_avail_show(struct device *dev, | |
307 | struct device_attribute *dev_attr, | |
308 | char *buf) | |
309 | { | |
310 | struct hv_device *hv_dev = device_to_hv_device(dev); | |
311 | struct hv_ring_buffer_debug_info outbound; | |
312 | ||
313 | if (!hv_dev->channel) | |
314 | return -ENODEV; | |
315 | hv_ringbuffer_get_debuginfo(&hv_dev->channel->outbound, &outbound); | |
316 | return sprintf(buf, "%d\n", outbound.bytes_avail_towrite); | |
317 | } | |
318 | static DEVICE_ATTR_RO(out_write_bytes_avail); | |
319 | ||
320 | static ssize_t in_intr_mask_show(struct device *dev, | |
321 | struct device_attribute *dev_attr, char *buf) | |
322 | { | |
323 | struct hv_device *hv_dev = device_to_hv_device(dev); | |
324 | struct hv_ring_buffer_debug_info inbound; | |
325 | ||
326 | if (!hv_dev->channel) | |
327 | return -ENODEV; | |
328 | hv_ringbuffer_get_debuginfo(&hv_dev->channel->inbound, &inbound); | |
329 | return sprintf(buf, "%d\n", inbound.current_interrupt_mask); | |
330 | } | |
331 | static DEVICE_ATTR_RO(in_intr_mask); | |
332 | ||
333 | static ssize_t in_read_index_show(struct device *dev, | |
334 | struct device_attribute *dev_attr, char *buf) | |
335 | { | |
336 | struct hv_device *hv_dev = device_to_hv_device(dev); | |
337 | struct hv_ring_buffer_debug_info inbound; | |
338 | ||
339 | if (!hv_dev->channel) | |
340 | return -ENODEV; | |
341 | hv_ringbuffer_get_debuginfo(&hv_dev->channel->inbound, &inbound); | |
342 | return sprintf(buf, "%d\n", inbound.current_read_index); | |
343 | } | |
344 | static DEVICE_ATTR_RO(in_read_index); | |
345 | ||
346 | static ssize_t in_write_index_show(struct device *dev, | |
347 | struct device_attribute *dev_attr, char *buf) | |
348 | { | |
349 | struct hv_device *hv_dev = device_to_hv_device(dev); | |
350 | struct hv_ring_buffer_debug_info inbound; | |
351 | ||
352 | if (!hv_dev->channel) | |
353 | return -ENODEV; | |
354 | hv_ringbuffer_get_debuginfo(&hv_dev->channel->inbound, &inbound); | |
355 | return sprintf(buf, "%d\n", inbound.current_write_index); | |
356 | } | |
357 | static DEVICE_ATTR_RO(in_write_index); | |
358 | ||
359 | static ssize_t in_read_bytes_avail_show(struct device *dev, | |
360 | struct device_attribute *dev_attr, | |
361 | char *buf) | |
362 | { | |
363 | struct hv_device *hv_dev = device_to_hv_device(dev); | |
364 | struct hv_ring_buffer_debug_info inbound; | |
365 | ||
366 | if (!hv_dev->channel) | |
367 | return -ENODEV; | |
368 | hv_ringbuffer_get_debuginfo(&hv_dev->channel->inbound, &inbound); | |
369 | return sprintf(buf, "%d\n", inbound.bytes_avail_toread); | |
370 | } | |
371 | static DEVICE_ATTR_RO(in_read_bytes_avail); | |
372 | ||
373 | static ssize_t in_write_bytes_avail_show(struct device *dev, | |
374 | struct device_attribute *dev_attr, | |
375 | char *buf) | |
376 | { | |
377 | struct hv_device *hv_dev = device_to_hv_device(dev); | |
378 | struct hv_ring_buffer_debug_info inbound; | |
379 | ||
380 | if (!hv_dev->channel) | |
381 | return -ENODEV; | |
382 | hv_ringbuffer_get_debuginfo(&hv_dev->channel->inbound, &inbound); | |
383 | return sprintf(buf, "%d\n", inbound.bytes_avail_towrite); | |
384 | } | |
385 | static DEVICE_ATTR_RO(in_write_bytes_avail); | |
386 | ||
387 | /* Set up per device attributes in /sys/bus/vmbus/devices/<bus device> */ | |
03f3a910 GKH |
388 | static struct attribute *vmbus_attrs[] = { |
389 | &dev_attr_id.attr, | |
a8fb5f3d | 390 | &dev_attr_state.attr, |
5ffd00e2 | 391 | &dev_attr_monitor_id.attr, |
68234c04 | 392 | &dev_attr_class_id.attr, |
7c55e1d0 | 393 | &dev_attr_device_id.attr, |
647fa371 | 394 | &dev_attr_modalias.attr, |
76c52bbe GKH |
395 | &dev_attr_server_monitor_pending.attr, |
396 | &dev_attr_client_monitor_pending.attr, | |
1cee272b GKH |
397 | &dev_attr_server_monitor_latency.attr, |
398 | &dev_attr_client_monitor_latency.attr, | |
4947c745 GKH |
399 | &dev_attr_server_monitor_conn_id.attr, |
400 | &dev_attr_client_monitor_conn_id.attr, | |
98f4c651 GKH |
401 | &dev_attr_out_intr_mask.attr, |
402 | &dev_attr_out_read_index.attr, | |
403 | &dev_attr_out_write_index.attr, | |
404 | &dev_attr_out_read_bytes_avail.attr, | |
405 | &dev_attr_out_write_bytes_avail.attr, | |
406 | &dev_attr_in_intr_mask.attr, | |
407 | &dev_attr_in_read_index.attr, | |
408 | &dev_attr_in_write_index.attr, | |
409 | &dev_attr_in_read_bytes_avail.attr, | |
410 | &dev_attr_in_write_bytes_avail.attr, | |
03f3a910 GKH |
411 | NULL, |
412 | }; | |
413 | ATTRIBUTE_GROUPS(vmbus); | |
414 | ||
adde2487 S |
415 | /* |
416 | * vmbus_uevent - add uevent for our device | |
417 | * | |
418 | * This routine is invoked when a device is added or removed on the vmbus to | |
419 | * generate a uevent to udev in the userspace. The udev will then look at its | |
420 | * rule and the uevent generated here to load the appropriate driver | |
0ddda660 S |
421 | * |
422 | * The alias string will be of the form vmbus:guid where guid is the string | |
423 | * representation of the device guid (each byte of the guid will be | |
424 | * represented with two hex characters. | |
adde2487 S |
425 | */ |
426 | static int vmbus_uevent(struct device *device, struct kobj_uevent_env *env) | |
427 | { | |
428 | struct hv_device *dev = device_to_hv_device(device); | |
fd776ba9 OH |
429 | int ret; |
430 | char alias_name[VMBUS_ALIAS_LEN + 1]; | |
0ddda660 | 431 | |
fd776ba9 | 432 | print_alias_name(dev, alias_name); |
0ddda660 S |
433 | ret = add_uevent_var(env, "MODALIAS=vmbus:%s", alias_name); |
434 | return ret; | |
adde2487 S |
435 | } |
436 | ||
5841a829 S |
437 | static uuid_le null_guid; |
438 | ||
439 | static inline bool is_null_guid(const __u8 *guid) | |
440 | { | |
441 | if (memcmp(guid, &null_guid, sizeof(uuid_le))) | |
442 | return false; | |
443 | return true; | |
444 | } | |
445 | ||
3037a7b6 S |
446 | /* |
447 | * Return a matching hv_vmbus_device_id pointer. | |
448 | * If there is no match, return NULL. | |
449 | */ | |
450 | static const struct hv_vmbus_device_id *hv_vmbus_get_id( | |
451 | const struct hv_vmbus_device_id *id, | |
452 | __u8 *guid) | |
453 | { | |
454 | for (; !is_null_guid(id->guid); id++) | |
455 | if (!memcmp(&id->guid, guid, sizeof(uuid_le))) | |
456 | return id; | |
457 | ||
458 | return NULL; | |
459 | } | |
460 | ||
461 | ||
b7fc147b S |
462 | |
463 | /* | |
464 | * vmbus_match - Attempt to match the specified device to the specified driver | |
465 | */ | |
466 | static int vmbus_match(struct device *device, struct device_driver *driver) | |
467 | { | |
b7fc147b | 468 | struct hv_driver *drv = drv_to_hv_drv(driver); |
e8e27047 | 469 | struct hv_device *hv_dev = device_to_hv_device(device); |
b7fc147b | 470 | |
3037a7b6 S |
471 | if (hv_vmbus_get_id(drv->id_table, hv_dev->dev_type.b)) |
472 | return 1; | |
de632a2b | 473 | |
5841a829 | 474 | return 0; |
b7fc147b S |
475 | } |
476 | ||
f1f0d67b S |
477 | /* |
478 | * vmbus_probe - Add the new vmbus's child device | |
479 | */ | |
480 | static int vmbus_probe(struct device *child_device) | |
481 | { | |
482 | int ret = 0; | |
483 | struct hv_driver *drv = | |
484 | drv_to_hv_drv(child_device->driver); | |
9efd21e1 | 485 | struct hv_device *dev = device_to_hv_device(child_device); |
84946899 | 486 | const struct hv_vmbus_device_id *dev_id; |
f1f0d67b | 487 | |
84946899 | 488 | dev_id = hv_vmbus_get_id(drv->id_table, dev->dev_type.b); |
9efd21e1 | 489 | if (drv->probe) { |
84946899 | 490 | ret = drv->probe(dev, dev_id); |
b14a7b30 | 491 | if (ret != 0) |
0a46618d HJ |
492 | pr_err("probe failed for device %s (%d)\n", |
493 | dev_name(child_device), ret); | |
f1f0d67b | 494 | |
f1f0d67b | 495 | } else { |
0a46618d HJ |
496 | pr_err("probe not set for driver %s\n", |
497 | dev_name(child_device)); | |
6de925b1 | 498 | ret = -ENODEV; |
f1f0d67b S |
499 | } |
500 | return ret; | |
501 | } | |
502 | ||
c5dce3db S |
503 | /* |
504 | * vmbus_remove - Remove a vmbus device | |
505 | */ | |
506 | static int vmbus_remove(struct device *child_device) | |
507 | { | |
d4372179 | 508 | struct hv_driver *drv = drv_to_hv_drv(child_device->driver); |
415b023a | 509 | struct hv_device *dev = device_to_hv_device(child_device); |
c5dce3db | 510 | |
d4372179 S |
511 | if (drv->remove) |
512 | drv->remove(dev); | |
513 | else | |
514 | pr_err("remove not set for driver %s\n", | |
515 | dev_name(child_device)); | |
c5dce3db S |
516 | |
517 | return 0; | |
518 | } | |
519 | ||
eb1bb259 S |
520 | |
521 | /* | |
522 | * vmbus_shutdown - Shutdown a vmbus device | |
523 | */ | |
524 | static void vmbus_shutdown(struct device *child_device) | |
525 | { | |
526 | struct hv_driver *drv; | |
ca6887fb | 527 | struct hv_device *dev = device_to_hv_device(child_device); |
eb1bb259 S |
528 | |
529 | ||
530 | /* The device may not be attached yet */ | |
531 | if (!child_device->driver) | |
532 | return; | |
533 | ||
534 | drv = drv_to_hv_drv(child_device->driver); | |
535 | ||
ca6887fb S |
536 | if (drv->shutdown) |
537 | drv->shutdown(dev); | |
eb1bb259 S |
538 | |
539 | return; | |
540 | } | |
541 | ||
086e7a56 S |
542 | |
543 | /* | |
544 | * vmbus_device_release - Final callback release of the vmbus child device | |
545 | */ | |
546 | static void vmbus_device_release(struct device *device) | |
547 | { | |
e8e27047 | 548 | struct hv_device *hv_dev = device_to_hv_device(device); |
086e7a56 | 549 | |
e8e27047 | 550 | kfree(hv_dev); |
086e7a56 S |
551 | |
552 | } | |
553 | ||
454f18a9 | 554 | /* The one and only one */ |
9adcac5c S |
555 | static struct bus_type hv_bus = { |
556 | .name = "vmbus", | |
557 | .match = vmbus_match, | |
558 | .shutdown = vmbus_shutdown, | |
559 | .remove = vmbus_remove, | |
560 | .probe = vmbus_probe, | |
561 | .uevent = vmbus_uevent, | |
03f3a910 | 562 | .dev_groups = vmbus_groups, |
3e7ee490 HJ |
563 | }; |
564 | ||
adf874cb | 565 | static const char *driver_name = "hyperv"; |
36199a99 | 566 | |
36199a99 | 567 | |
bf6506f6 TT |
568 | struct onmessage_work_context { |
569 | struct work_struct work; | |
570 | struct hv_message msg; | |
571 | }; | |
572 | ||
573 | static void vmbus_onmessage_work(struct work_struct *work) | |
574 | { | |
575 | struct onmessage_work_context *ctx; | |
576 | ||
577 | ctx = container_of(work, struct onmessage_work_context, | |
578 | work); | |
579 | vmbus_onmessage(&ctx->msg); | |
580 | kfree(ctx); | |
581 | } | |
582 | ||
62c1059d | 583 | static void vmbus_on_msg_dpc(unsigned long data) |
36199a99 GKH |
584 | { |
585 | int cpu = smp_processor_id(); | |
586 | void *page_addr = hv_context.synic_message_page[cpu]; | |
587 | struct hv_message *msg = (struct hv_message *)page_addr + | |
588 | VMBUS_MESSAGE_SINT; | |
bf6506f6 | 589 | struct onmessage_work_context *ctx; |
36199a99 GKH |
590 | |
591 | while (1) { | |
592 | if (msg->header.message_type == HVMSG_NONE) { | |
593 | /* no msg */ | |
594 | break; | |
595 | } else { | |
bf6506f6 TT |
596 | ctx = kmalloc(sizeof(*ctx), GFP_ATOMIC); |
597 | if (ctx == NULL) | |
36199a99 | 598 | continue; |
bf6506f6 TT |
599 | INIT_WORK(&ctx->work, vmbus_onmessage_work); |
600 | memcpy(&ctx->msg, msg, sizeof(*msg)); | |
da9fcb72 | 601 | queue_work(vmbus_connection.work_queue, &ctx->work); |
36199a99 GKH |
602 | } |
603 | ||
604 | msg->header.message_type = HVMSG_NONE; | |
605 | ||
606 | /* | |
607 | * Make sure the write to MessageType (ie set to | |
608 | * HVMSG_NONE) happens before we read the | |
609 | * MessagePending and EOMing. Otherwise, the EOMing | |
610 | * will not deliver any more messages since there is | |
611 | * no empty slot | |
612 | */ | |
35848f68 | 613 | mb(); |
36199a99 GKH |
614 | |
615 | if (msg->header.message_flags.msg_pending) { | |
616 | /* | |
617 | * This will cause message queue rescan to | |
618 | * possibly deliver another msg from the | |
619 | * hypervisor | |
620 | */ | |
621 | wrmsrl(HV_X64_MSR_EOM, 0); | |
622 | } | |
623 | } | |
624 | } | |
625 | ||
ae4636e6 | 626 | static irqreturn_t vmbus_isr(int irq, void *dev_id) |
36199a99 | 627 | { |
36199a99 GKH |
628 | int cpu = smp_processor_id(); |
629 | void *page_addr; | |
630 | struct hv_message *msg; | |
631 | union hv_synic_event_flags *event; | |
ae4636e6 | 632 | bool handled = false; |
36199a99 | 633 | |
5ab05951 S |
634 | page_addr = hv_context.synic_event_page[cpu]; |
635 | if (page_addr == NULL) | |
636 | return IRQ_NONE; | |
637 | ||
638 | event = (union hv_synic_event_flags *)page_addr + | |
639 | VMBUS_MESSAGE_SINT; | |
7341d908 S |
640 | /* |
641 | * Check for events before checking for messages. This is the order | |
642 | * in which events and messages are checked in Windows guests on | |
643 | * Hyper-V, and the Windows team suggested we do the same. | |
644 | */ | |
36199a99 | 645 | |
6552ecd7 S |
646 | if ((vmbus_proto_version == VERSION_WS2008) || |
647 | (vmbus_proto_version == VERSION_WIN7)) { | |
36199a99 | 648 | |
6552ecd7 S |
649 | /* Since we are a child, we only need to check bit 0 */ |
650 | if (sync_test_and_clear_bit(0, | |
651 | (unsigned long *) &event->flags32[0])) { | |
652 | handled = true; | |
653 | } | |
654 | } else { | |
655 | /* | |
656 | * Our host is win8 or above. The signaling mechanism | |
657 | * has changed and we can directly look at the event page. | |
658 | * If bit n is set then we have an interrup on the channel | |
659 | * whose id is n. | |
660 | */ | |
ae4636e6 | 661 | handled = true; |
ae4636e6 | 662 | } |
793be9c7 | 663 | |
6552ecd7 | 664 | if (handled) |
db11f12a | 665 | tasklet_schedule(hv_context.event_dpc[cpu]); |
6552ecd7 S |
666 | |
667 | ||
7341d908 S |
668 | page_addr = hv_context.synic_message_page[cpu]; |
669 | msg = (struct hv_message *)page_addr + VMBUS_MESSAGE_SINT; | |
670 | ||
671 | /* Check if there are actual msgs to be processed */ | |
672 | if (msg->header.message_type != HVMSG_NONE) { | |
673 | handled = true; | |
674 | tasklet_schedule(&msg_dpc); | |
675 | } | |
676 | ||
ae4636e6 | 677 | if (handled) |
793be9c7 | 678 | return IRQ_HANDLED; |
ae4636e6 | 679 | else |
793be9c7 | 680 | return IRQ_NONE; |
793be9c7 S |
681 | } |
682 | ||
b0209501 S |
683 | /* |
684 | * vmbus interrupt flow handler: | |
685 | * vmbus interrupts can concurrently occur on multiple CPUs and | |
686 | * can be handled concurrently. | |
687 | */ | |
688 | ||
83ebf6e5 | 689 | static void vmbus_flow_handler(unsigned int irq, struct irq_desc *desc) |
b0209501 S |
690 | { |
691 | kstat_incr_irqs_this_cpu(irq, desc); | |
692 | ||
693 | desc->action->handler(irq, desc->action->dev_id); | |
694 | } | |
695 | ||
3e189519 | 696 | /* |
90c9960e GKH |
697 | * vmbus_bus_init -Main vmbus driver initialization routine. |
698 | * | |
699 | * Here, we | |
0686e4f4 | 700 | * - initialize the vmbus driver context |
0686e4f4 LL |
701 | * - invoke the vmbus hv main init routine |
702 | * - get the irq resource | |
0686e4f4 | 703 | * - retrieve the channel offers |
90c9960e | 704 | */ |
9aaa995e | 705 | static int vmbus_bus_init(int irq) |
3e7ee490 | 706 | { |
90c9960e | 707 | int ret; |
3e7ee490 | 708 | |
6d26e38f GKH |
709 | /* Hypervisor initialization...setup hypercall page..etc */ |
710 | ret = hv_init(); | |
90c9960e | 711 | if (ret != 0) { |
0a46618d | 712 | pr_err("Unable to initialize the hypervisor - 0x%x\n", ret); |
d6c1c5de | 713 | return ret; |
3e7ee490 HJ |
714 | } |
715 | ||
59c0e4f0 | 716 | tasklet_init(&msg_dpc, vmbus_on_msg_dpc, 0); |
3e7ee490 | 717 | |
9adcac5c | 718 | ret = bus_register(&hv_bus); |
d6c1c5de | 719 | if (ret) |
8b9987e9 | 720 | goto err_cleanup; |
3e7ee490 | 721 | |
20ed3ef7 | 722 | ret = request_irq(irq, vmbus_isr, 0, driver_name, hv_acpi_dev); |
3e7ee490 | 723 | |
90c9960e | 724 | if (ret != 0) { |
0a46618d | 725 | pr_err("Unable to request IRQ %d\n", |
9aaa995e | 726 | irq); |
8b9987e9 | 727 | goto err_unregister; |
3e7ee490 | 728 | } |
3e7ee490 | 729 | |
b0209501 S |
730 | /* |
731 | * Vmbus interrupts can be handled concurrently on | |
732 | * different CPUs. Establish an appropriate interrupt flow | |
733 | * handler that can support this model. | |
734 | */ | |
735 | irq_set_handler(irq, vmbus_flow_handler); | |
736 | ||
302a3c0f S |
737 | /* |
738 | * Register our interrupt handler. | |
739 | */ | |
740 | hv_register_vmbus_handler(irq, vmbus_isr); | |
3e7ee490 | 741 | |
2608fb65 JW |
742 | ret = hv_synic_alloc(); |
743 | if (ret) | |
744 | goto err_alloc; | |
800b6902 | 745 | /* |
302a3c0f | 746 | * Initialize the per-cpu interrupt state and |
800b6902 S |
747 | * connect to the host. |
748 | */ | |
302a3c0f | 749 | on_each_cpu(hv_synic_init, NULL, 1); |
800b6902 | 750 | ret = vmbus_connect(); |
8b9987e9 | 751 | if (ret) |
2608fb65 | 752 | goto err_alloc; |
800b6902 | 753 | |
2d6e882b | 754 | vmbus_request_offers(); |
8b5d6d3b | 755 | |
d6c1c5de | 756 | return 0; |
8b9987e9 | 757 | |
2608fb65 JW |
758 | err_alloc: |
759 | hv_synic_free(); | |
8b9987e9 S |
760 | free_irq(irq, hv_acpi_dev); |
761 | ||
762 | err_unregister: | |
763 | bus_unregister(&hv_bus); | |
764 | ||
765 | err_cleanup: | |
766 | hv_cleanup(); | |
767 | ||
768 | return ret; | |
3e7ee490 HJ |
769 | } |
770 | ||
90c9960e | 771 | /** |
768fa219 GKH |
772 | * __vmbus_child_driver_register - Register a vmbus's driver |
773 | * @drv: Pointer to driver structure you want to register | |
774 | * @owner: owner module of the drv | |
775 | * @mod_name: module name string | |
3e189519 HJ |
776 | * |
777 | * Registers the given driver with Linux through the 'driver_register()' call | |
768fa219 | 778 | * and sets up the hyper-v vmbus handling for this driver. |
3e189519 HJ |
779 | * It will return the state of the 'driver_register()' call. |
780 | * | |
90c9960e | 781 | */ |
768fa219 | 782 | int __vmbus_driver_register(struct hv_driver *hv_driver, struct module *owner, const char *mod_name) |
3e7ee490 | 783 | { |
5d48a1c2 | 784 | int ret; |
3e7ee490 | 785 | |
768fa219 | 786 | pr_info("registering driver %s\n", hv_driver->name); |
3e7ee490 | 787 | |
cf6a2eac S |
788 | ret = vmbus_exists(); |
789 | if (ret < 0) | |
790 | return ret; | |
791 | ||
768fa219 GKH |
792 | hv_driver->driver.name = hv_driver->name; |
793 | hv_driver->driver.owner = owner; | |
794 | hv_driver->driver.mod_name = mod_name; | |
795 | hv_driver->driver.bus = &hv_bus; | |
3e7ee490 | 796 | |
768fa219 | 797 | ret = driver_register(&hv_driver->driver); |
3e7ee490 | 798 | |
5d48a1c2 | 799 | return ret; |
3e7ee490 | 800 | } |
768fa219 | 801 | EXPORT_SYMBOL_GPL(__vmbus_driver_register); |
3e7ee490 | 802 | |
90c9960e | 803 | /** |
768fa219 GKH |
804 | * vmbus_driver_unregister() - Unregister a vmbus's driver |
805 | * @drv: Pointer to driver structure you want to un-register | |
3e189519 | 806 | * |
768fa219 GKH |
807 | * Un-register the given driver that was previous registered with a call to |
808 | * vmbus_driver_register() | |
90c9960e | 809 | */ |
768fa219 | 810 | void vmbus_driver_unregister(struct hv_driver *hv_driver) |
3e7ee490 | 811 | { |
768fa219 | 812 | pr_info("unregistering driver %s\n", hv_driver->name); |
3e7ee490 | 813 | |
cf6a2eac | 814 | if (!vmbus_exists()) |
8f257a14 | 815 | driver_unregister(&hv_driver->driver); |
3e7ee490 | 816 | } |
768fa219 | 817 | EXPORT_SYMBOL_GPL(vmbus_driver_unregister); |
3e7ee490 | 818 | |
3e189519 | 819 | /* |
f2c73011 | 820 | * vmbus_device_create - Creates and registers a new child device |
3e189519 | 821 | * on the vmbus. |
90c9960e | 822 | */ |
f2c73011 | 823 | struct hv_device *vmbus_device_create(uuid_le *type, |
358d2ee2 | 824 | uuid_le *instance, |
89733aa9 | 825 | struct vmbus_channel *channel) |
3e7ee490 | 826 | { |
3d3b5518 | 827 | struct hv_device *child_device_obj; |
3e7ee490 | 828 | |
6bad88da S |
829 | child_device_obj = kzalloc(sizeof(struct hv_device), GFP_KERNEL); |
830 | if (!child_device_obj) { | |
0a46618d | 831 | pr_err("Unable to allocate device object for child device\n"); |
3e7ee490 HJ |
832 | return NULL; |
833 | } | |
834 | ||
cae5b843 | 835 | child_device_obj->channel = channel; |
358d2ee2 | 836 | memcpy(&child_device_obj->dev_type, type, sizeof(uuid_le)); |
ca623ad3 | 837 | memcpy(&child_device_obj->dev_instance, instance, |
358d2ee2 | 838 | sizeof(uuid_le)); |
3e7ee490 | 839 | |
3e7ee490 | 840 | |
3e7ee490 HJ |
841 | return child_device_obj; |
842 | } | |
843 | ||
3e189519 | 844 | /* |
22794281 | 845 | * vmbus_device_register - Register the child device |
90c9960e | 846 | */ |
22794281 | 847 | int vmbus_device_register(struct hv_device *child_device_obj) |
3e7ee490 | 848 | { |
90c9960e | 849 | int ret = 0; |
6bad88da | 850 | |
f4888417 | 851 | static atomic_t device_num = ATOMIC_INIT(0); |
3e7ee490 | 852 | |
6bad88da | 853 | dev_set_name(&child_device_obj->device, "vmbus_0_%d", |
90c9960e | 854 | atomic_inc_return(&device_num)); |
3e7ee490 | 855 | |
0bce28b6 | 856 | child_device_obj->device.bus = &hv_bus; |
607c1a11 | 857 | child_device_obj->device.parent = &hv_acpi_dev->dev; |
6bad88da | 858 | child_device_obj->device.release = vmbus_device_release; |
3e7ee490 | 859 | |
90c9960e GKH |
860 | /* |
861 | * Register with the LDM. This will kick off the driver/device | |
862 | * binding...which will eventually call vmbus_match() and vmbus_probe() | |
863 | */ | |
6bad88da | 864 | ret = device_register(&child_device_obj->device); |
3e7ee490 | 865 | |
3e7ee490 | 866 | if (ret) |
0a46618d | 867 | pr_err("Unable to register child device\n"); |
3e7ee490 | 868 | else |
84672369 | 869 | pr_debug("child device %s registered\n", |
0a46618d | 870 | dev_name(&child_device_obj->device)); |
3e7ee490 | 871 | |
3e7ee490 HJ |
872 | return ret; |
873 | } | |
874 | ||
3e189519 | 875 | /* |
696453ba | 876 | * vmbus_device_unregister - Remove the specified child device |
3e189519 | 877 | * from the vmbus. |
90c9960e | 878 | */ |
696453ba | 879 | void vmbus_device_unregister(struct hv_device *device_obj) |
3e7ee490 | 880 | { |
84672369 FS |
881 | pr_debug("child device %s unregistered\n", |
882 | dev_name(&device_obj->device)); | |
883 | ||
90c9960e GKH |
884 | /* |
885 | * Kick off the process of unregistering the device. | |
886 | * This will call vmbus_remove() and eventually vmbus_device_release() | |
887 | */ | |
6bad88da | 888 | device_unregister(&device_obj->device); |
3e7ee490 HJ |
889 | } |
890 | ||
3e7ee490 | 891 | |
b0069f43 | 892 | /* |
90f34535 S |
893 | * VMBUS is an acpi enumerated device. Get the the information we |
894 | * need from DSDT. | |
b0069f43 S |
895 | */ |
896 | ||
90f34535 | 897 | static acpi_status vmbus_walk_resources(struct acpi_resource *res, void *ctx) |
b0069f43 | 898 | { |
90f34535 S |
899 | switch (res->type) { |
900 | case ACPI_RESOURCE_TYPE_IRQ: | |
901 | irq = res->data.irq.interrupts[0]; | |
b0069f43 | 902 | |
90f34535 S |
903 | case ACPI_RESOURCE_TYPE_ADDRESS64: |
904 | hyperv_mmio_start = res->data.address64.minimum; | |
905 | hyperv_mmio_size = res->data.address64.address_length; | |
b0069f43 S |
906 | } |
907 | ||
908 | return AE_OK; | |
909 | } | |
910 | ||
911 | static int vmbus_acpi_add(struct acpi_device *device) | |
912 | { | |
913 | acpi_status result; | |
90f34535 | 914 | int ret_val = -ENODEV; |
b0069f43 | 915 | |
607c1a11 S |
916 | hv_acpi_dev = device; |
917 | ||
0a4425b6 | 918 | result = acpi_walk_resources(device->handle, METHOD_NAME__CRS, |
90f34535 | 919 | vmbus_walk_resources, NULL); |
b0069f43 | 920 | |
90f34535 S |
921 | if (ACPI_FAILURE(result)) |
922 | goto acpi_walk_err; | |
923 | /* | |
924 | * The parent of the vmbus acpi device (Gen2 firmware) is the VMOD that | |
925 | * has the mmio ranges. Get that. | |
926 | */ | |
927 | if (device->parent) { | |
928 | result = acpi_walk_resources(device->parent->handle, | |
929 | METHOD_NAME__CRS, | |
930 | vmbus_walk_resources, NULL); | |
931 | ||
932 | if (ACPI_FAILURE(result)) | |
933 | goto acpi_walk_err; | |
b0069f43 | 934 | } |
90f34535 S |
935 | ret_val = 0; |
936 | ||
937 | acpi_walk_err: | |
b0069f43 | 938 | complete(&probe_event); |
90f34535 | 939 | return ret_val; |
b0069f43 S |
940 | } |
941 | ||
942 | static const struct acpi_device_id vmbus_acpi_device_ids[] = { | |
943 | {"VMBUS", 0}, | |
9d7b18d1 | 944 | {"VMBus", 0}, |
b0069f43 S |
945 | {"", 0}, |
946 | }; | |
947 | MODULE_DEVICE_TABLE(acpi, vmbus_acpi_device_ids); | |
948 | ||
949 | static struct acpi_driver vmbus_acpi_driver = { | |
950 | .name = "vmbus", | |
951 | .ids = vmbus_acpi_device_ids, | |
952 | .ops = { | |
953 | .add = vmbus_acpi_add, | |
954 | }, | |
955 | }; | |
956 | ||
607c1a11 | 957 | static int __init hv_acpi_init(void) |
1168ac22 | 958 | { |
2dda95f8 | 959 | int ret, t; |
b0069f43 | 960 | |
1f94ea81 | 961 | if (x86_hyper != &x86_hyper_ms_hyperv) |
0592969e JW |
962 | return -ENODEV; |
963 | ||
b0069f43 S |
964 | init_completion(&probe_event); |
965 | ||
966 | /* | |
967 | * Get irq resources first. | |
968 | */ | |
969 | ||
0246604c S |
970 | ret = acpi_bus_register_driver(&vmbus_acpi_driver); |
971 | ||
b0069f43 S |
972 | if (ret) |
973 | return ret; | |
974 | ||
2dda95f8 S |
975 | t = wait_for_completion_timeout(&probe_event, 5*HZ); |
976 | if (t == 0) { | |
977 | ret = -ETIMEDOUT; | |
978 | goto cleanup; | |
979 | } | |
b0069f43 S |
980 | |
981 | if (irq <= 0) { | |
2dda95f8 S |
982 | ret = -ENODEV; |
983 | goto cleanup; | |
b0069f43 S |
984 | } |
985 | ||
91fd799e S |
986 | ret = vmbus_bus_init(irq); |
987 | if (ret) | |
2dda95f8 S |
988 | goto cleanup; |
989 | ||
990 | return 0; | |
991 | ||
992 | cleanup: | |
993 | acpi_bus_unregister_driver(&vmbus_acpi_driver); | |
cf6a2eac | 994 | hv_acpi_dev = NULL; |
91fd799e | 995 | return ret; |
1168ac22 S |
996 | } |
997 | ||
93e5bd06 S |
998 | static void __exit vmbus_exit(void) |
999 | { | |
1000 | ||
1001 | free_irq(irq, hv_acpi_dev); | |
1002 | vmbus_free_channels(); | |
1003 | bus_unregister(&hv_bus); | |
1004 | hv_cleanup(); | |
1005 | acpi_bus_unregister_driver(&vmbus_acpi_driver); | |
1006 | } | |
1007 | ||
1168ac22 | 1008 | |
90c9960e | 1009 | MODULE_LICENSE("GPL"); |
3e7ee490 | 1010 | |
43d4e119 | 1011 | subsys_initcall(hv_acpi_init); |
93e5bd06 | 1012 | module_exit(vmbus_exit); |