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> |
4061ed9e | 35 | #include <linux/clockchips.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; |
98db4335 | 46 | |
90eedf0c GH |
47 | struct resource hyperv_mmio = { |
48 | .name = "hyperv mmio", | |
49 | .flags = IORESOURCE_MEM, | |
50 | }; | |
51 | EXPORT_SYMBOL_GPL(hyperv_mmio); | |
98db4335 | 52 | |
cf6a2eac S |
53 | static int vmbus_exists(void) |
54 | { | |
55 | if (hv_acpi_dev == NULL) | |
56 | return -ENODEV; | |
57 | ||
58 | return 0; | |
59 | } | |
60 | ||
fd776ba9 OH |
61 | #define VMBUS_ALIAS_LEN ((sizeof((struct hv_vmbus_device_id *)0)->guid) * 2) |
62 | static void print_alias_name(struct hv_device *hv_dev, char *alias_name) | |
63 | { | |
64 | int i; | |
65 | for (i = 0; i < VMBUS_ALIAS_LEN; i += 2) | |
66 | sprintf(&alias_name[i], "%02x", hv_dev->dev_type.b[i/2]); | |
67 | } | |
68 | ||
76c52bbe GKH |
69 | static u8 channel_monitor_group(struct vmbus_channel *channel) |
70 | { | |
71 | return (u8)channel->offermsg.monitorid / 32; | |
72 | } | |
73 | ||
74 | static u8 channel_monitor_offset(struct vmbus_channel *channel) | |
75 | { | |
76 | return (u8)channel->offermsg.monitorid % 32; | |
77 | } | |
78 | ||
79 | static u32 channel_pending(struct vmbus_channel *channel, | |
80 | struct hv_monitor_page *monitor_page) | |
81 | { | |
82 | u8 monitor_group = channel_monitor_group(channel); | |
83 | return monitor_page->trigger_group[monitor_group].pending; | |
84 | } | |
85 | ||
1cee272b GKH |
86 | static u32 channel_latency(struct vmbus_channel *channel, |
87 | struct hv_monitor_page *monitor_page) | |
88 | { | |
89 | u8 monitor_group = channel_monitor_group(channel); | |
90 | u8 monitor_offset = channel_monitor_offset(channel); | |
91 | return monitor_page->latency[monitor_group][monitor_offset]; | |
92 | } | |
93 | ||
4947c745 GKH |
94 | static u32 channel_conn_id(struct vmbus_channel *channel, |
95 | struct hv_monitor_page *monitor_page) | |
96 | { | |
97 | u8 monitor_group = channel_monitor_group(channel); | |
98 | u8 monitor_offset = channel_monitor_offset(channel); | |
99 | return monitor_page->parameter[monitor_group][monitor_offset].connectionid.u.id; | |
100 | } | |
101 | ||
03f3a910 GKH |
102 | static ssize_t id_show(struct device *dev, struct device_attribute *dev_attr, |
103 | char *buf) | |
104 | { | |
105 | struct hv_device *hv_dev = device_to_hv_device(dev); | |
106 | ||
107 | if (!hv_dev->channel) | |
108 | return -ENODEV; | |
109 | return sprintf(buf, "%d\n", hv_dev->channel->offermsg.child_relid); | |
110 | } | |
111 | static DEVICE_ATTR_RO(id); | |
112 | ||
a8fb5f3d GKH |
113 | static ssize_t state_show(struct device *dev, struct device_attribute *dev_attr, |
114 | char *buf) | |
115 | { | |
116 | struct hv_device *hv_dev = device_to_hv_device(dev); | |
117 | ||
118 | if (!hv_dev->channel) | |
119 | return -ENODEV; | |
120 | return sprintf(buf, "%d\n", hv_dev->channel->state); | |
121 | } | |
122 | static DEVICE_ATTR_RO(state); | |
123 | ||
5ffd00e2 GKH |
124 | static ssize_t monitor_id_show(struct device *dev, |
125 | struct device_attribute *dev_attr, char *buf) | |
126 | { | |
127 | struct hv_device *hv_dev = device_to_hv_device(dev); | |
128 | ||
129 | if (!hv_dev->channel) | |
130 | return -ENODEV; | |
131 | return sprintf(buf, "%d\n", hv_dev->channel->offermsg.monitorid); | |
132 | } | |
133 | static DEVICE_ATTR_RO(monitor_id); | |
134 | ||
68234c04 GKH |
135 | static ssize_t class_id_show(struct device *dev, |
136 | struct device_attribute *dev_attr, char *buf) | |
137 | { | |
138 | struct hv_device *hv_dev = device_to_hv_device(dev); | |
139 | ||
140 | if (!hv_dev->channel) | |
141 | return -ENODEV; | |
142 | return sprintf(buf, "{%pUl}\n", | |
143 | hv_dev->channel->offermsg.offer.if_type.b); | |
144 | } | |
145 | static DEVICE_ATTR_RO(class_id); | |
146 | ||
7c55e1d0 GKH |
147 | static ssize_t device_id_show(struct device *dev, |
148 | struct device_attribute *dev_attr, char *buf) | |
149 | { | |
150 | struct hv_device *hv_dev = device_to_hv_device(dev); | |
151 | ||
152 | if (!hv_dev->channel) | |
153 | return -ENODEV; | |
154 | return sprintf(buf, "{%pUl}\n", | |
155 | hv_dev->channel->offermsg.offer.if_instance.b); | |
156 | } | |
157 | static DEVICE_ATTR_RO(device_id); | |
158 | ||
647fa371 GKH |
159 | static ssize_t modalias_show(struct device *dev, |
160 | struct device_attribute *dev_attr, char *buf) | |
161 | { | |
162 | struct hv_device *hv_dev = device_to_hv_device(dev); | |
163 | char alias_name[VMBUS_ALIAS_LEN + 1]; | |
164 | ||
165 | print_alias_name(hv_dev, alias_name); | |
166 | return sprintf(buf, "vmbus:%s\n", alias_name); | |
167 | } | |
168 | static DEVICE_ATTR_RO(modalias); | |
169 | ||
76c52bbe GKH |
170 | static ssize_t server_monitor_pending_show(struct device *dev, |
171 | struct device_attribute *dev_attr, | |
172 | char *buf) | |
173 | { | |
174 | struct hv_device *hv_dev = device_to_hv_device(dev); | |
175 | ||
176 | if (!hv_dev->channel) | |
177 | return -ENODEV; | |
178 | return sprintf(buf, "%d\n", | |
179 | channel_pending(hv_dev->channel, | |
180 | vmbus_connection.monitor_pages[1])); | |
181 | } | |
182 | static DEVICE_ATTR_RO(server_monitor_pending); | |
183 | ||
184 | static ssize_t client_monitor_pending_show(struct device *dev, | |
185 | struct device_attribute *dev_attr, | |
186 | char *buf) | |
187 | { | |
188 | struct hv_device *hv_dev = device_to_hv_device(dev); | |
189 | ||
190 | if (!hv_dev->channel) | |
191 | return -ENODEV; | |
192 | return sprintf(buf, "%d\n", | |
193 | channel_pending(hv_dev->channel, | |
194 | vmbus_connection.monitor_pages[1])); | |
195 | } | |
196 | static DEVICE_ATTR_RO(client_monitor_pending); | |
68234c04 | 197 | |
1cee272b GKH |
198 | static ssize_t server_monitor_latency_show(struct device *dev, |
199 | struct device_attribute *dev_attr, | |
200 | char *buf) | |
201 | { | |
202 | struct hv_device *hv_dev = device_to_hv_device(dev); | |
203 | ||
204 | if (!hv_dev->channel) | |
205 | return -ENODEV; | |
206 | return sprintf(buf, "%d\n", | |
207 | channel_latency(hv_dev->channel, | |
208 | vmbus_connection.monitor_pages[0])); | |
209 | } | |
210 | static DEVICE_ATTR_RO(server_monitor_latency); | |
211 | ||
212 | static ssize_t client_monitor_latency_show(struct device *dev, | |
213 | struct device_attribute *dev_attr, | |
214 | char *buf) | |
215 | { | |
216 | struct hv_device *hv_dev = device_to_hv_device(dev); | |
217 | ||
218 | if (!hv_dev->channel) | |
219 | return -ENODEV; | |
220 | return sprintf(buf, "%d\n", | |
221 | channel_latency(hv_dev->channel, | |
222 | vmbus_connection.monitor_pages[1])); | |
223 | } | |
224 | static DEVICE_ATTR_RO(client_monitor_latency); | |
225 | ||
4947c745 GKH |
226 | static ssize_t server_monitor_conn_id_show(struct device *dev, |
227 | struct device_attribute *dev_attr, | |
228 | char *buf) | |
229 | { | |
230 | struct hv_device *hv_dev = device_to_hv_device(dev); | |
231 | ||
232 | if (!hv_dev->channel) | |
233 | return -ENODEV; | |
234 | return sprintf(buf, "%d\n", | |
235 | channel_conn_id(hv_dev->channel, | |
236 | vmbus_connection.monitor_pages[0])); | |
237 | } | |
238 | static DEVICE_ATTR_RO(server_monitor_conn_id); | |
239 | ||
240 | static ssize_t client_monitor_conn_id_show(struct device *dev, | |
241 | struct device_attribute *dev_attr, | |
242 | char *buf) | |
243 | { | |
244 | struct hv_device *hv_dev = device_to_hv_device(dev); | |
245 | ||
246 | if (!hv_dev->channel) | |
247 | return -ENODEV; | |
248 | return sprintf(buf, "%d\n", | |
249 | channel_conn_id(hv_dev->channel, | |
250 | vmbus_connection.monitor_pages[1])); | |
251 | } | |
252 | static DEVICE_ATTR_RO(client_monitor_conn_id); | |
253 | ||
98f4c651 GKH |
254 | static ssize_t out_intr_mask_show(struct device *dev, |
255 | struct device_attribute *dev_attr, char *buf) | |
256 | { | |
257 | struct hv_device *hv_dev = device_to_hv_device(dev); | |
258 | struct hv_ring_buffer_debug_info outbound; | |
259 | ||
260 | if (!hv_dev->channel) | |
261 | return -ENODEV; | |
262 | hv_ringbuffer_get_debuginfo(&hv_dev->channel->outbound, &outbound); | |
263 | return sprintf(buf, "%d\n", outbound.current_interrupt_mask); | |
264 | } | |
265 | static DEVICE_ATTR_RO(out_intr_mask); | |
266 | ||
267 | static ssize_t out_read_index_show(struct device *dev, | |
268 | struct device_attribute *dev_attr, char *buf) | |
269 | { | |
270 | struct hv_device *hv_dev = device_to_hv_device(dev); | |
271 | struct hv_ring_buffer_debug_info outbound; | |
272 | ||
273 | if (!hv_dev->channel) | |
274 | return -ENODEV; | |
275 | hv_ringbuffer_get_debuginfo(&hv_dev->channel->outbound, &outbound); | |
276 | return sprintf(buf, "%d\n", outbound.current_read_index); | |
277 | } | |
278 | static DEVICE_ATTR_RO(out_read_index); | |
279 | ||
280 | static ssize_t out_write_index_show(struct device *dev, | |
281 | struct device_attribute *dev_attr, | |
282 | char *buf) | |
283 | { | |
284 | struct hv_device *hv_dev = device_to_hv_device(dev); | |
285 | struct hv_ring_buffer_debug_info outbound; | |
286 | ||
287 | if (!hv_dev->channel) | |
288 | return -ENODEV; | |
289 | hv_ringbuffer_get_debuginfo(&hv_dev->channel->outbound, &outbound); | |
290 | return sprintf(buf, "%d\n", outbound.current_write_index); | |
291 | } | |
292 | static DEVICE_ATTR_RO(out_write_index); | |
293 | ||
294 | static ssize_t out_read_bytes_avail_show(struct device *dev, | |
295 | struct device_attribute *dev_attr, | |
296 | char *buf) | |
297 | { | |
298 | struct hv_device *hv_dev = device_to_hv_device(dev); | |
299 | struct hv_ring_buffer_debug_info outbound; | |
300 | ||
301 | if (!hv_dev->channel) | |
302 | return -ENODEV; | |
303 | hv_ringbuffer_get_debuginfo(&hv_dev->channel->outbound, &outbound); | |
304 | return sprintf(buf, "%d\n", outbound.bytes_avail_toread); | |
305 | } | |
306 | static DEVICE_ATTR_RO(out_read_bytes_avail); | |
307 | ||
308 | static ssize_t out_write_bytes_avail_show(struct device *dev, | |
309 | struct device_attribute *dev_attr, | |
310 | char *buf) | |
311 | { | |
312 | struct hv_device *hv_dev = device_to_hv_device(dev); | |
313 | struct hv_ring_buffer_debug_info outbound; | |
314 | ||
315 | if (!hv_dev->channel) | |
316 | return -ENODEV; | |
317 | hv_ringbuffer_get_debuginfo(&hv_dev->channel->outbound, &outbound); | |
318 | return sprintf(buf, "%d\n", outbound.bytes_avail_towrite); | |
319 | } | |
320 | static DEVICE_ATTR_RO(out_write_bytes_avail); | |
321 | ||
322 | static ssize_t in_intr_mask_show(struct device *dev, | |
323 | struct device_attribute *dev_attr, char *buf) | |
324 | { | |
325 | struct hv_device *hv_dev = device_to_hv_device(dev); | |
326 | struct hv_ring_buffer_debug_info inbound; | |
327 | ||
328 | if (!hv_dev->channel) | |
329 | return -ENODEV; | |
330 | hv_ringbuffer_get_debuginfo(&hv_dev->channel->inbound, &inbound); | |
331 | return sprintf(buf, "%d\n", inbound.current_interrupt_mask); | |
332 | } | |
333 | static DEVICE_ATTR_RO(in_intr_mask); | |
334 | ||
335 | static ssize_t in_read_index_show(struct device *dev, | |
336 | struct device_attribute *dev_attr, char *buf) | |
337 | { | |
338 | struct hv_device *hv_dev = device_to_hv_device(dev); | |
339 | struct hv_ring_buffer_debug_info inbound; | |
340 | ||
341 | if (!hv_dev->channel) | |
342 | return -ENODEV; | |
343 | hv_ringbuffer_get_debuginfo(&hv_dev->channel->inbound, &inbound); | |
344 | return sprintf(buf, "%d\n", inbound.current_read_index); | |
345 | } | |
346 | static DEVICE_ATTR_RO(in_read_index); | |
347 | ||
348 | static ssize_t in_write_index_show(struct device *dev, | |
349 | struct device_attribute *dev_attr, char *buf) | |
350 | { | |
351 | struct hv_device *hv_dev = device_to_hv_device(dev); | |
352 | struct hv_ring_buffer_debug_info inbound; | |
353 | ||
354 | if (!hv_dev->channel) | |
355 | return -ENODEV; | |
356 | hv_ringbuffer_get_debuginfo(&hv_dev->channel->inbound, &inbound); | |
357 | return sprintf(buf, "%d\n", inbound.current_write_index); | |
358 | } | |
359 | static DEVICE_ATTR_RO(in_write_index); | |
360 | ||
361 | static ssize_t in_read_bytes_avail_show(struct device *dev, | |
362 | struct device_attribute *dev_attr, | |
363 | char *buf) | |
364 | { | |
365 | struct hv_device *hv_dev = device_to_hv_device(dev); | |
366 | struct hv_ring_buffer_debug_info inbound; | |
367 | ||
368 | if (!hv_dev->channel) | |
369 | return -ENODEV; | |
370 | hv_ringbuffer_get_debuginfo(&hv_dev->channel->inbound, &inbound); | |
371 | return sprintf(buf, "%d\n", inbound.bytes_avail_toread); | |
372 | } | |
373 | static DEVICE_ATTR_RO(in_read_bytes_avail); | |
374 | ||
375 | static ssize_t in_write_bytes_avail_show(struct device *dev, | |
376 | struct device_attribute *dev_attr, | |
377 | char *buf) | |
378 | { | |
379 | struct hv_device *hv_dev = device_to_hv_device(dev); | |
380 | struct hv_ring_buffer_debug_info inbound; | |
381 | ||
382 | if (!hv_dev->channel) | |
383 | return -ENODEV; | |
384 | hv_ringbuffer_get_debuginfo(&hv_dev->channel->inbound, &inbound); | |
385 | return sprintf(buf, "%d\n", inbound.bytes_avail_towrite); | |
386 | } | |
387 | static DEVICE_ATTR_RO(in_write_bytes_avail); | |
388 | ||
389 | /* Set up per device attributes in /sys/bus/vmbus/devices/<bus device> */ | |
03f3a910 GKH |
390 | static struct attribute *vmbus_attrs[] = { |
391 | &dev_attr_id.attr, | |
a8fb5f3d | 392 | &dev_attr_state.attr, |
5ffd00e2 | 393 | &dev_attr_monitor_id.attr, |
68234c04 | 394 | &dev_attr_class_id.attr, |
7c55e1d0 | 395 | &dev_attr_device_id.attr, |
647fa371 | 396 | &dev_attr_modalias.attr, |
76c52bbe GKH |
397 | &dev_attr_server_monitor_pending.attr, |
398 | &dev_attr_client_monitor_pending.attr, | |
1cee272b GKH |
399 | &dev_attr_server_monitor_latency.attr, |
400 | &dev_attr_client_monitor_latency.attr, | |
4947c745 GKH |
401 | &dev_attr_server_monitor_conn_id.attr, |
402 | &dev_attr_client_monitor_conn_id.attr, | |
98f4c651 GKH |
403 | &dev_attr_out_intr_mask.attr, |
404 | &dev_attr_out_read_index.attr, | |
405 | &dev_attr_out_write_index.attr, | |
406 | &dev_attr_out_read_bytes_avail.attr, | |
407 | &dev_attr_out_write_bytes_avail.attr, | |
408 | &dev_attr_in_intr_mask.attr, | |
409 | &dev_attr_in_read_index.attr, | |
410 | &dev_attr_in_write_index.attr, | |
411 | &dev_attr_in_read_bytes_avail.attr, | |
412 | &dev_attr_in_write_bytes_avail.attr, | |
03f3a910 GKH |
413 | NULL, |
414 | }; | |
415 | ATTRIBUTE_GROUPS(vmbus); | |
416 | ||
adde2487 S |
417 | /* |
418 | * vmbus_uevent - add uevent for our device | |
419 | * | |
420 | * This routine is invoked when a device is added or removed on the vmbus to | |
421 | * generate a uevent to udev in the userspace. The udev will then look at its | |
422 | * rule and the uevent generated here to load the appropriate driver | |
0ddda660 S |
423 | * |
424 | * The alias string will be of the form vmbus:guid where guid is the string | |
425 | * representation of the device guid (each byte of the guid will be | |
426 | * represented with two hex characters. | |
adde2487 S |
427 | */ |
428 | static int vmbus_uevent(struct device *device, struct kobj_uevent_env *env) | |
429 | { | |
430 | struct hv_device *dev = device_to_hv_device(device); | |
fd776ba9 OH |
431 | int ret; |
432 | char alias_name[VMBUS_ALIAS_LEN + 1]; | |
0ddda660 | 433 | |
fd776ba9 | 434 | print_alias_name(dev, alias_name); |
0ddda660 S |
435 | ret = add_uevent_var(env, "MODALIAS=vmbus:%s", alias_name); |
436 | return ret; | |
adde2487 S |
437 | } |
438 | ||
1b9d48f2 | 439 | static const uuid_le null_guid; |
5841a829 S |
440 | |
441 | static inline bool is_null_guid(const __u8 *guid) | |
442 | { | |
443 | if (memcmp(guid, &null_guid, sizeof(uuid_le))) | |
444 | return false; | |
445 | return true; | |
446 | } | |
447 | ||
3037a7b6 S |
448 | /* |
449 | * Return a matching hv_vmbus_device_id pointer. | |
450 | * If there is no match, return NULL. | |
451 | */ | |
452 | static const struct hv_vmbus_device_id *hv_vmbus_get_id( | |
453 | const struct hv_vmbus_device_id *id, | |
1b9d48f2 | 454 | const __u8 *guid) |
3037a7b6 S |
455 | { |
456 | for (; !is_null_guid(id->guid); id++) | |
457 | if (!memcmp(&id->guid, guid, sizeof(uuid_le))) | |
458 | return id; | |
459 | ||
460 | return NULL; | |
461 | } | |
462 | ||
463 | ||
b7fc147b S |
464 | |
465 | /* | |
466 | * vmbus_match - Attempt to match the specified device to the specified driver | |
467 | */ | |
468 | static int vmbus_match(struct device *device, struct device_driver *driver) | |
469 | { | |
b7fc147b | 470 | struct hv_driver *drv = drv_to_hv_drv(driver); |
e8e27047 | 471 | struct hv_device *hv_dev = device_to_hv_device(device); |
b7fc147b | 472 | |
3037a7b6 S |
473 | if (hv_vmbus_get_id(drv->id_table, hv_dev->dev_type.b)) |
474 | return 1; | |
de632a2b | 475 | |
5841a829 | 476 | return 0; |
b7fc147b S |
477 | } |
478 | ||
f1f0d67b S |
479 | /* |
480 | * vmbus_probe - Add the new vmbus's child device | |
481 | */ | |
482 | static int vmbus_probe(struct device *child_device) | |
483 | { | |
484 | int ret = 0; | |
485 | struct hv_driver *drv = | |
486 | drv_to_hv_drv(child_device->driver); | |
9efd21e1 | 487 | struct hv_device *dev = device_to_hv_device(child_device); |
84946899 | 488 | const struct hv_vmbus_device_id *dev_id; |
f1f0d67b | 489 | |
84946899 | 490 | dev_id = hv_vmbus_get_id(drv->id_table, dev->dev_type.b); |
9efd21e1 | 491 | if (drv->probe) { |
84946899 | 492 | ret = drv->probe(dev, dev_id); |
b14a7b30 | 493 | if (ret != 0) |
0a46618d HJ |
494 | pr_err("probe failed for device %s (%d)\n", |
495 | dev_name(child_device), ret); | |
f1f0d67b | 496 | |
f1f0d67b | 497 | } else { |
0a46618d HJ |
498 | pr_err("probe not set for driver %s\n", |
499 | dev_name(child_device)); | |
6de925b1 | 500 | ret = -ENODEV; |
f1f0d67b S |
501 | } |
502 | return ret; | |
503 | } | |
504 | ||
c5dce3db S |
505 | /* |
506 | * vmbus_remove - Remove a vmbus device | |
507 | */ | |
508 | static int vmbus_remove(struct device *child_device) | |
509 | { | |
d4372179 | 510 | struct hv_driver *drv = drv_to_hv_drv(child_device->driver); |
415b023a | 511 | struct hv_device *dev = device_to_hv_device(child_device); |
c5dce3db | 512 | |
d4372179 S |
513 | if (drv->remove) |
514 | drv->remove(dev); | |
515 | else | |
516 | pr_err("remove not set for driver %s\n", | |
517 | dev_name(child_device)); | |
c5dce3db S |
518 | |
519 | return 0; | |
520 | } | |
521 | ||
eb1bb259 S |
522 | |
523 | /* | |
524 | * vmbus_shutdown - Shutdown a vmbus device | |
525 | */ | |
526 | static void vmbus_shutdown(struct device *child_device) | |
527 | { | |
528 | struct hv_driver *drv; | |
ca6887fb | 529 | struct hv_device *dev = device_to_hv_device(child_device); |
eb1bb259 S |
530 | |
531 | ||
532 | /* The device may not be attached yet */ | |
533 | if (!child_device->driver) | |
534 | return; | |
535 | ||
536 | drv = drv_to_hv_drv(child_device->driver); | |
537 | ||
ca6887fb S |
538 | if (drv->shutdown) |
539 | drv->shutdown(dev); | |
eb1bb259 S |
540 | |
541 | return; | |
542 | } | |
543 | ||
086e7a56 S |
544 | |
545 | /* | |
546 | * vmbus_device_release - Final callback release of the vmbus child device | |
547 | */ | |
548 | static void vmbus_device_release(struct device *device) | |
549 | { | |
e8e27047 | 550 | struct hv_device *hv_dev = device_to_hv_device(device); |
086e7a56 | 551 | |
e8e27047 | 552 | kfree(hv_dev); |
086e7a56 S |
553 | |
554 | } | |
555 | ||
454f18a9 | 556 | /* The one and only one */ |
9adcac5c S |
557 | static struct bus_type hv_bus = { |
558 | .name = "vmbus", | |
559 | .match = vmbus_match, | |
560 | .shutdown = vmbus_shutdown, | |
561 | .remove = vmbus_remove, | |
562 | .probe = vmbus_probe, | |
563 | .uevent = vmbus_uevent, | |
03f3a910 | 564 | .dev_groups = vmbus_groups, |
3e7ee490 HJ |
565 | }; |
566 | ||
bf6506f6 TT |
567 | struct onmessage_work_context { |
568 | struct work_struct work; | |
569 | struct hv_message msg; | |
570 | }; | |
571 | ||
572 | static void vmbus_onmessage_work(struct work_struct *work) | |
573 | { | |
574 | struct onmessage_work_context *ctx; | |
575 | ||
576 | ctx = container_of(work, struct onmessage_work_context, | |
577 | work); | |
578 | vmbus_onmessage(&ctx->msg); | |
579 | kfree(ctx); | |
580 | } | |
581 | ||
4061ed9e S |
582 | void hv_process_timer_expiration(struct hv_message *msg, int cpu) |
583 | { | |
584 | struct clock_event_device *dev = hv_context.clk_evt[cpu]; | |
585 | ||
586 | if (dev->event_handler) | |
587 | dev->event_handler(dev); | |
588 | ||
589 | msg->header.message_type = HVMSG_NONE; | |
590 | ||
591 | /* | |
592 | * Make sure the write to MessageType (ie set to | |
593 | * HVMSG_NONE) happens before we read the | |
594 | * MessagePending and EOMing. Otherwise, the EOMing | |
595 | * will not deliver any more messages since there is | |
596 | * no empty slot | |
597 | */ | |
598 | mb(); | |
599 | ||
600 | if (msg->header.message_flags.msg_pending) { | |
601 | /* | |
602 | * This will cause message queue rescan to | |
603 | * possibly deliver another msg from the | |
604 | * hypervisor | |
605 | */ | |
606 | wrmsrl(HV_X64_MSR_EOM, 0); | |
607 | } | |
608 | } | |
609 | ||
62c1059d | 610 | static void vmbus_on_msg_dpc(unsigned long data) |
36199a99 GKH |
611 | { |
612 | int cpu = smp_processor_id(); | |
613 | void *page_addr = hv_context.synic_message_page[cpu]; | |
614 | struct hv_message *msg = (struct hv_message *)page_addr + | |
615 | VMBUS_MESSAGE_SINT; | |
bf6506f6 | 616 | struct onmessage_work_context *ctx; |
36199a99 GKH |
617 | |
618 | while (1) { | |
619 | if (msg->header.message_type == HVMSG_NONE) { | |
620 | /* no msg */ | |
621 | break; | |
622 | } else { | |
bf6506f6 TT |
623 | ctx = kmalloc(sizeof(*ctx), GFP_ATOMIC); |
624 | if (ctx == NULL) | |
36199a99 | 625 | continue; |
bf6506f6 TT |
626 | INIT_WORK(&ctx->work, vmbus_onmessage_work); |
627 | memcpy(&ctx->msg, msg, sizeof(*msg)); | |
da9fcb72 | 628 | queue_work(vmbus_connection.work_queue, &ctx->work); |
36199a99 GKH |
629 | } |
630 | ||
631 | msg->header.message_type = HVMSG_NONE; | |
632 | ||
633 | /* | |
634 | * Make sure the write to MessageType (ie set to | |
635 | * HVMSG_NONE) happens before we read the | |
636 | * MessagePending and EOMing. Otherwise, the EOMing | |
637 | * will not deliver any more messages since there is | |
638 | * no empty slot | |
639 | */ | |
35848f68 | 640 | mb(); |
36199a99 GKH |
641 | |
642 | if (msg->header.message_flags.msg_pending) { | |
643 | /* | |
644 | * This will cause message queue rescan to | |
645 | * possibly deliver another msg from the | |
646 | * hypervisor | |
647 | */ | |
648 | wrmsrl(HV_X64_MSR_EOM, 0); | |
649 | } | |
650 | } | |
651 | } | |
652 | ||
76d388cd | 653 | static void vmbus_isr(void) |
36199a99 | 654 | { |
36199a99 GKH |
655 | int cpu = smp_processor_id(); |
656 | void *page_addr; | |
657 | struct hv_message *msg; | |
658 | union hv_synic_event_flags *event; | |
ae4636e6 | 659 | bool handled = false; |
36199a99 | 660 | |
5ab05951 S |
661 | page_addr = hv_context.synic_event_page[cpu]; |
662 | if (page_addr == NULL) | |
76d388cd | 663 | return; |
5ab05951 S |
664 | |
665 | event = (union hv_synic_event_flags *)page_addr + | |
666 | VMBUS_MESSAGE_SINT; | |
7341d908 S |
667 | /* |
668 | * Check for events before checking for messages. This is the order | |
669 | * in which events and messages are checked in Windows guests on | |
670 | * Hyper-V, and the Windows team suggested we do the same. | |
671 | */ | |
36199a99 | 672 | |
6552ecd7 S |
673 | if ((vmbus_proto_version == VERSION_WS2008) || |
674 | (vmbus_proto_version == VERSION_WIN7)) { | |
36199a99 | 675 | |
6552ecd7 S |
676 | /* Since we are a child, we only need to check bit 0 */ |
677 | if (sync_test_and_clear_bit(0, | |
678 | (unsigned long *) &event->flags32[0])) { | |
679 | handled = true; | |
680 | } | |
681 | } else { | |
682 | /* | |
683 | * Our host is win8 or above. The signaling mechanism | |
684 | * has changed and we can directly look at the event page. | |
685 | * If bit n is set then we have an interrup on the channel | |
686 | * whose id is n. | |
687 | */ | |
ae4636e6 | 688 | handled = true; |
ae4636e6 | 689 | } |
793be9c7 | 690 | |
6552ecd7 | 691 | if (handled) |
db11f12a | 692 | tasklet_schedule(hv_context.event_dpc[cpu]); |
6552ecd7 S |
693 | |
694 | ||
7341d908 S |
695 | page_addr = hv_context.synic_message_page[cpu]; |
696 | msg = (struct hv_message *)page_addr + VMBUS_MESSAGE_SINT; | |
697 | ||
698 | /* Check if there are actual msgs to be processed */ | |
4061ed9e S |
699 | if (msg->header.message_type != HVMSG_NONE) { |
700 | if (msg->header.message_type == HVMSG_TIMER_EXPIRED) | |
701 | hv_process_timer_expiration(msg, cpu); | |
702 | else | |
703 | tasklet_schedule(&msg_dpc); | |
704 | } | |
793be9c7 S |
705 | } |
706 | ||
3e189519 | 707 | /* |
90c9960e GKH |
708 | * vmbus_bus_init -Main vmbus driver initialization routine. |
709 | * | |
710 | * Here, we | |
0686e4f4 | 711 | * - initialize the vmbus driver context |
0686e4f4 LL |
712 | * - invoke the vmbus hv main init routine |
713 | * - get the irq resource | |
0686e4f4 | 714 | * - retrieve the channel offers |
90c9960e | 715 | */ |
9aaa995e | 716 | static int vmbus_bus_init(int irq) |
3e7ee490 | 717 | { |
90c9960e | 718 | int ret; |
3e7ee490 | 719 | |
6d26e38f GKH |
720 | /* Hypervisor initialization...setup hypercall page..etc */ |
721 | ret = hv_init(); | |
90c9960e | 722 | if (ret != 0) { |
0a46618d | 723 | pr_err("Unable to initialize the hypervisor - 0x%x\n", ret); |
d6c1c5de | 724 | return ret; |
3e7ee490 HJ |
725 | } |
726 | ||
59c0e4f0 | 727 | tasklet_init(&msg_dpc, vmbus_on_msg_dpc, 0); |
3e7ee490 | 728 | |
9adcac5c | 729 | ret = bus_register(&hv_bus); |
d6c1c5de | 730 | if (ret) |
8b9987e9 | 731 | goto err_cleanup; |
3e7ee490 | 732 | |
76d388cd | 733 | hv_setup_vmbus_irq(vmbus_isr); |
3e7ee490 | 734 | |
2608fb65 JW |
735 | ret = hv_synic_alloc(); |
736 | if (ret) | |
737 | goto err_alloc; | |
800b6902 | 738 | /* |
302a3c0f | 739 | * Initialize the per-cpu interrupt state and |
800b6902 S |
740 | * connect to the host. |
741 | */ | |
302a3c0f | 742 | on_each_cpu(hv_synic_init, NULL, 1); |
800b6902 | 743 | ret = vmbus_connect(); |
8b9987e9 | 744 | if (ret) |
2608fb65 | 745 | goto err_alloc; |
800b6902 | 746 | |
2d6e882b | 747 | vmbus_request_offers(); |
8b5d6d3b | 748 | |
d6c1c5de | 749 | return 0; |
8b9987e9 | 750 | |
2608fb65 JW |
751 | err_alloc: |
752 | hv_synic_free(); | |
76d388cd | 753 | hv_remove_vmbus_irq(); |
8b9987e9 | 754 | |
8b9987e9 S |
755 | bus_unregister(&hv_bus); |
756 | ||
757 | err_cleanup: | |
758 | hv_cleanup(); | |
759 | ||
760 | return ret; | |
3e7ee490 HJ |
761 | } |
762 | ||
90c9960e | 763 | /** |
768fa219 GKH |
764 | * __vmbus_child_driver_register - Register a vmbus's driver |
765 | * @drv: Pointer to driver structure you want to register | |
766 | * @owner: owner module of the drv | |
767 | * @mod_name: module name string | |
3e189519 HJ |
768 | * |
769 | * Registers the given driver with Linux through the 'driver_register()' call | |
768fa219 | 770 | * and sets up the hyper-v vmbus handling for this driver. |
3e189519 HJ |
771 | * It will return the state of the 'driver_register()' call. |
772 | * | |
90c9960e | 773 | */ |
768fa219 | 774 | int __vmbus_driver_register(struct hv_driver *hv_driver, struct module *owner, const char *mod_name) |
3e7ee490 | 775 | { |
5d48a1c2 | 776 | int ret; |
3e7ee490 | 777 | |
768fa219 | 778 | pr_info("registering driver %s\n", hv_driver->name); |
3e7ee490 | 779 | |
cf6a2eac S |
780 | ret = vmbus_exists(); |
781 | if (ret < 0) | |
782 | return ret; | |
783 | ||
768fa219 GKH |
784 | hv_driver->driver.name = hv_driver->name; |
785 | hv_driver->driver.owner = owner; | |
786 | hv_driver->driver.mod_name = mod_name; | |
787 | hv_driver->driver.bus = &hv_bus; | |
3e7ee490 | 788 | |
768fa219 | 789 | ret = driver_register(&hv_driver->driver); |
3e7ee490 | 790 | |
5d48a1c2 | 791 | return ret; |
3e7ee490 | 792 | } |
768fa219 | 793 | EXPORT_SYMBOL_GPL(__vmbus_driver_register); |
3e7ee490 | 794 | |
90c9960e | 795 | /** |
768fa219 GKH |
796 | * vmbus_driver_unregister() - Unregister a vmbus's driver |
797 | * @drv: Pointer to driver structure you want to un-register | |
3e189519 | 798 | * |
768fa219 GKH |
799 | * Un-register the given driver that was previous registered with a call to |
800 | * vmbus_driver_register() | |
90c9960e | 801 | */ |
768fa219 | 802 | void vmbus_driver_unregister(struct hv_driver *hv_driver) |
3e7ee490 | 803 | { |
768fa219 | 804 | pr_info("unregistering driver %s\n", hv_driver->name); |
3e7ee490 | 805 | |
cf6a2eac | 806 | if (!vmbus_exists()) |
8f257a14 | 807 | driver_unregister(&hv_driver->driver); |
3e7ee490 | 808 | } |
768fa219 | 809 | EXPORT_SYMBOL_GPL(vmbus_driver_unregister); |
3e7ee490 | 810 | |
3e189519 | 811 | /* |
f2c73011 | 812 | * vmbus_device_create - Creates and registers a new child device |
3e189519 | 813 | * on the vmbus. |
90c9960e | 814 | */ |
1b9d48f2 | 815 | struct hv_device *vmbus_device_create(const uuid_le *type, |
816 | const uuid_le *instance, | |
817 | struct vmbus_channel *channel) | |
3e7ee490 | 818 | { |
3d3b5518 | 819 | struct hv_device *child_device_obj; |
3e7ee490 | 820 | |
6bad88da S |
821 | child_device_obj = kzalloc(sizeof(struct hv_device), GFP_KERNEL); |
822 | if (!child_device_obj) { | |
0a46618d | 823 | pr_err("Unable to allocate device object for child device\n"); |
3e7ee490 HJ |
824 | return NULL; |
825 | } | |
826 | ||
cae5b843 | 827 | child_device_obj->channel = channel; |
358d2ee2 | 828 | memcpy(&child_device_obj->dev_type, type, sizeof(uuid_le)); |
ca623ad3 | 829 | memcpy(&child_device_obj->dev_instance, instance, |
358d2ee2 | 830 | sizeof(uuid_le)); |
3e7ee490 | 831 | |
3e7ee490 | 832 | |
3e7ee490 HJ |
833 | return child_device_obj; |
834 | } | |
835 | ||
3e189519 | 836 | /* |
22794281 | 837 | * vmbus_device_register - Register the child device |
90c9960e | 838 | */ |
22794281 | 839 | int vmbus_device_register(struct hv_device *child_device_obj) |
3e7ee490 | 840 | { |
90c9960e | 841 | int ret = 0; |
6bad88da | 842 | |
f4888417 | 843 | static atomic_t device_num = ATOMIC_INIT(0); |
3e7ee490 | 844 | |
6bad88da | 845 | dev_set_name(&child_device_obj->device, "vmbus_0_%d", |
90c9960e | 846 | atomic_inc_return(&device_num)); |
3e7ee490 | 847 | |
0bce28b6 | 848 | child_device_obj->device.bus = &hv_bus; |
607c1a11 | 849 | child_device_obj->device.parent = &hv_acpi_dev->dev; |
6bad88da | 850 | child_device_obj->device.release = vmbus_device_release; |
3e7ee490 | 851 | |
90c9960e GKH |
852 | /* |
853 | * Register with the LDM. This will kick off the driver/device | |
854 | * binding...which will eventually call vmbus_match() and vmbus_probe() | |
855 | */ | |
6bad88da | 856 | ret = device_register(&child_device_obj->device); |
3e7ee490 | 857 | |
3e7ee490 | 858 | if (ret) |
0a46618d | 859 | pr_err("Unable to register child device\n"); |
3e7ee490 | 860 | else |
84672369 | 861 | pr_debug("child device %s registered\n", |
0a46618d | 862 | dev_name(&child_device_obj->device)); |
3e7ee490 | 863 | |
3e7ee490 HJ |
864 | return ret; |
865 | } | |
866 | ||
3e189519 | 867 | /* |
696453ba | 868 | * vmbus_device_unregister - Remove the specified child device |
3e189519 | 869 | * from the vmbus. |
90c9960e | 870 | */ |
696453ba | 871 | void vmbus_device_unregister(struct hv_device *device_obj) |
3e7ee490 | 872 | { |
84672369 FS |
873 | pr_debug("child device %s unregistered\n", |
874 | dev_name(&device_obj->device)); | |
875 | ||
90c9960e GKH |
876 | /* |
877 | * Kick off the process of unregistering the device. | |
878 | * This will call vmbus_remove() and eventually vmbus_device_release() | |
879 | */ | |
6bad88da | 880 | device_unregister(&device_obj->device); |
3e7ee490 HJ |
881 | } |
882 | ||
3e7ee490 | 883 | |
b0069f43 | 884 | /* |
90f34535 S |
885 | * VMBUS is an acpi enumerated device. Get the the information we |
886 | * need from DSDT. | |
b0069f43 S |
887 | */ |
888 | ||
90f34535 | 889 | static acpi_status vmbus_walk_resources(struct acpi_resource *res, void *ctx) |
b0069f43 | 890 | { |
90f34535 S |
891 | switch (res->type) { |
892 | case ACPI_RESOURCE_TYPE_IRQ: | |
893 | irq = res->data.irq.interrupts[0]; | |
4eb923f8 | 894 | break; |
b0069f43 | 895 | |
90f34535 | 896 | case ACPI_RESOURCE_TYPE_ADDRESS64: |
90eedf0c GH |
897 | hyperv_mmio.start = res->data.address64.minimum; |
898 | hyperv_mmio.end = res->data.address64.maximum; | |
4eb923f8 | 899 | break; |
b0069f43 S |
900 | } |
901 | ||
902 | return AE_OK; | |
903 | } | |
904 | ||
905 | static int vmbus_acpi_add(struct acpi_device *device) | |
906 | { | |
907 | acpi_status result; | |
90f34535 | 908 | int ret_val = -ENODEV; |
b0069f43 | 909 | |
607c1a11 S |
910 | hv_acpi_dev = device; |
911 | ||
0a4425b6 | 912 | result = acpi_walk_resources(device->handle, METHOD_NAME__CRS, |
90f34535 | 913 | vmbus_walk_resources, NULL); |
b0069f43 | 914 | |
90f34535 S |
915 | if (ACPI_FAILURE(result)) |
916 | goto acpi_walk_err; | |
917 | /* | |
918 | * The parent of the vmbus acpi device (Gen2 firmware) is the VMOD that | |
919 | * has the mmio ranges. Get that. | |
920 | */ | |
921 | if (device->parent) { | |
922 | result = acpi_walk_resources(device->parent->handle, | |
923 | METHOD_NAME__CRS, | |
924 | vmbus_walk_resources, NULL); | |
925 | ||
926 | if (ACPI_FAILURE(result)) | |
927 | goto acpi_walk_err; | |
90eedf0c GH |
928 | if (hyperv_mmio.start && hyperv_mmio.end) |
929 | request_resource(&iomem_resource, &hyperv_mmio); | |
b0069f43 | 930 | } |
90f34535 S |
931 | ret_val = 0; |
932 | ||
933 | acpi_walk_err: | |
b0069f43 | 934 | complete(&probe_event); |
90f34535 | 935 | return ret_val; |
b0069f43 S |
936 | } |
937 | ||
938 | static const struct acpi_device_id vmbus_acpi_device_ids[] = { | |
939 | {"VMBUS", 0}, | |
9d7b18d1 | 940 | {"VMBus", 0}, |
b0069f43 S |
941 | {"", 0}, |
942 | }; | |
943 | MODULE_DEVICE_TABLE(acpi, vmbus_acpi_device_ids); | |
944 | ||
945 | static struct acpi_driver vmbus_acpi_driver = { | |
946 | .name = "vmbus", | |
947 | .ids = vmbus_acpi_device_ids, | |
948 | .ops = { | |
949 | .add = vmbus_acpi_add, | |
950 | }, | |
951 | }; | |
952 | ||
607c1a11 | 953 | static int __init hv_acpi_init(void) |
1168ac22 | 954 | { |
2dda95f8 | 955 | int ret, t; |
b0069f43 | 956 | |
1f94ea81 | 957 | if (x86_hyper != &x86_hyper_ms_hyperv) |
0592969e JW |
958 | return -ENODEV; |
959 | ||
b0069f43 S |
960 | init_completion(&probe_event); |
961 | ||
962 | /* | |
963 | * Get irq resources first. | |
964 | */ | |
0246604c S |
965 | ret = acpi_bus_register_driver(&vmbus_acpi_driver); |
966 | ||
b0069f43 S |
967 | if (ret) |
968 | return ret; | |
969 | ||
2dda95f8 S |
970 | t = wait_for_completion_timeout(&probe_event, 5*HZ); |
971 | if (t == 0) { | |
972 | ret = -ETIMEDOUT; | |
973 | goto cleanup; | |
974 | } | |
b0069f43 S |
975 | |
976 | if (irq <= 0) { | |
2dda95f8 S |
977 | ret = -ENODEV; |
978 | goto cleanup; | |
b0069f43 S |
979 | } |
980 | ||
91fd799e S |
981 | ret = vmbus_bus_init(irq); |
982 | if (ret) | |
2dda95f8 S |
983 | goto cleanup; |
984 | ||
985 | return 0; | |
986 | ||
987 | cleanup: | |
988 | acpi_bus_unregister_driver(&vmbus_acpi_driver); | |
cf6a2eac | 989 | hv_acpi_dev = NULL; |
91fd799e | 990 | return ret; |
1168ac22 S |
991 | } |
992 | ||
93e5bd06 S |
993 | static void __exit vmbus_exit(void) |
994 | { | |
76d388cd | 995 | hv_remove_vmbus_irq(); |
93e5bd06 S |
996 | vmbus_free_channels(); |
997 | bus_unregister(&hv_bus); | |
998 | hv_cleanup(); | |
999 | acpi_bus_unregister_driver(&vmbus_acpi_driver); | |
1000 | } | |
1001 | ||
1168ac22 | 1002 | |
90c9960e | 1003 | MODULE_LICENSE("GPL"); |
3e7ee490 | 1004 | |
43d4e119 | 1005 | subsys_initcall(hv_acpi_init); |
93e5bd06 | 1006 | module_exit(vmbus_exit); |