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> | |
28 | #include <linux/irq.h> | |
29 | #include <linux/interrupt.h> | |
30 | #include <linux/sysctl.h> | |
5a0e3ad6 | 31 | #include <linux/slab.h> |
b0069f43 S |
32 | #include <linux/acpi.h> |
33 | #include <acpi/acpi_bus.h> | |
8b5d6d3b | 34 | #include <linux/completion.h> |
46a97191 | 35 | #include <linux/hyperv.h> |
b0209501 | 36 | #include <linux/kernel_stat.h> |
407dd164 | 37 | #include <asm/hyperv.h> |
1f94ea81 | 38 | #include <asm/hypervisor.h> |
302a3c0f | 39 | #include <asm/mshyperv.h> |
0f2a6619 | 40 | #include "hyperv_vmbus.h" |
3e7ee490 | 41 | |
3e7ee490 | 42 | |
607c1a11 | 43 | static struct acpi_device *hv_acpi_dev; |
1168ac22 | 44 | |
59c0e4f0 | 45 | static struct tasklet_struct msg_dpc; |
71a6655d | 46 | static struct completion probe_event; |
b0069f43 | 47 | static int irq; |
98db4335 | 48 | |
15b80d64 | 49 | struct hv_device_info { |
15b80d64 GKH |
50 | uuid_le chn_type; |
51 | uuid_le chn_instance; | |
52 | ||
15b80d64 GKH |
53 | u32 server_monitor_pending; |
54 | u32 server_monitor_latency; | |
55 | u32 server_monitor_conn_id; | |
56 | u32 client_monitor_pending; | |
57 | u32 client_monitor_latency; | |
58 | u32 client_monitor_conn_id; | |
59 | ||
60 | struct hv_dev_port_info inbound; | |
61 | struct hv_dev_port_info outbound; | |
62 | }; | |
63 | ||
cf6a2eac S |
64 | static int vmbus_exists(void) |
65 | { | |
66 | if (hv_acpi_dev == NULL) | |
67 | return -ENODEV; | |
68 | ||
69 | return 0; | |
70 | } | |
71 | ||
15b80d64 | 72 | |
98db4335 S |
73 | static void get_channel_info(struct hv_device *device, |
74 | struct hv_device_info *info) | |
75 | { | |
76 | struct vmbus_channel_debug_info debug_info; | |
77 | ||
78 | if (!device->channel) | |
79 | return; | |
80 | ||
81 | vmbus_get_debug_info(device->channel, &debug_info); | |
82 | ||
98db4335 | 83 | memcpy(&info->chn_type, &debug_info.interfacetype, |
358d2ee2 | 84 | sizeof(uuid_le)); |
98db4335 | 85 | memcpy(&info->chn_instance, &debug_info.interface_instance, |
358d2ee2 | 86 | sizeof(uuid_le)); |
98db4335 | 87 | |
98db4335 S |
88 | info->server_monitor_pending = debug_info.servermonitor_pending; |
89 | info->server_monitor_latency = debug_info.servermonitor_latency; | |
90 | info->server_monitor_conn_id = debug_info.servermonitor_connectionid; | |
91 | ||
92 | info->client_monitor_pending = debug_info.clientmonitor_pending; | |
93 | info->client_monitor_latency = debug_info.clientmonitor_latency; | |
94 | info->client_monitor_conn_id = debug_info.clientmonitor_connectionid; | |
95 | ||
96 | info->inbound.int_mask = debug_info.inbound.current_interrupt_mask; | |
97 | info->inbound.read_idx = debug_info.inbound.current_read_index; | |
98 | info->inbound.write_idx = debug_info.inbound.current_write_index; | |
99 | info->inbound.bytes_avail_toread = | |
100 | debug_info.inbound.bytes_avail_toread; | |
101 | info->inbound.bytes_avail_towrite = | |
102 | debug_info.inbound.bytes_avail_towrite; | |
3e7ee490 | 103 | |
98db4335 S |
104 | info->outbound.int_mask = |
105 | debug_info.outbound.current_interrupt_mask; | |
106 | info->outbound.read_idx = debug_info.outbound.current_read_index; | |
107 | info->outbound.write_idx = debug_info.outbound.current_write_index; | |
108 | info->outbound.bytes_avail_toread = | |
109 | debug_info.outbound.bytes_avail_toread; | |
110 | info->outbound.bytes_avail_towrite = | |
111 | debug_info.outbound.bytes_avail_towrite; | |
112 | } | |
3e7ee490 | 113 | |
fd776ba9 OH |
114 | #define VMBUS_ALIAS_LEN ((sizeof((struct hv_vmbus_device_id *)0)->guid) * 2) |
115 | static void print_alias_name(struct hv_device *hv_dev, char *alias_name) | |
116 | { | |
117 | int i; | |
118 | for (i = 0; i < VMBUS_ALIAS_LEN; i += 2) | |
119 | sprintf(&alias_name[i], "%02x", hv_dev->dev_type.b[i/2]); | |
120 | } | |
121 | ||
98db4335 S |
122 | /* |
123 | * vmbus_show_device_attr - Show the device attribute in sysfs. | |
124 | * | |
125 | * This is invoked when user does a | |
126 | * "cat /sys/bus/vmbus/devices/<busdevice>/<attr name>" | |
127 | */ | |
90c9960e GKH |
128 | static ssize_t vmbus_show_device_attr(struct device *dev, |
129 | struct device_attribute *dev_attr, | |
98db4335 S |
130 | char *buf) |
131 | { | |
e8e27047 | 132 | struct hv_device *hv_dev = device_to_hv_device(dev); |
7bb52384 | 133 | struct hv_device_info *device_info; |
fd776ba9 | 134 | char alias_name[VMBUS_ALIAS_LEN + 1]; |
7bb52384 | 135 | int ret = 0; |
3e7ee490 | 136 | |
7bb52384 S |
137 | device_info = kzalloc(sizeof(struct hv_device_info), GFP_KERNEL); |
138 | if (!device_info) | |
139 | return ret; | |
3e7ee490 | 140 | |
7bb52384 | 141 | get_channel_info(hv_dev, device_info); |
3e7ee490 | 142 | |
98db4335 | 143 | if (!strcmp(dev_attr->attr.name, "class_id")) { |
2221f6ef | 144 | ret = sprintf(buf, "{%pUl}\n", device_info->chn_type.b); |
98db4335 | 145 | } else if (!strcmp(dev_attr->attr.name, "device_id")) { |
2221f6ef | 146 | ret = sprintf(buf, "{%pUl}\n", device_info->chn_instance.b); |
fd776ba9 OH |
147 | } else if (!strcmp(dev_attr->attr.name, "modalias")) { |
148 | print_alias_name(hv_dev, alias_name); | |
7bb52384 | 149 | ret = sprintf(buf, "vmbus:%s\n", alias_name); |
98db4335 | 150 | } else if (!strcmp(dev_attr->attr.name, "out_intr_mask")) { |
7bb52384 | 151 | ret = sprintf(buf, "%d\n", device_info->outbound.int_mask); |
98db4335 | 152 | } else if (!strcmp(dev_attr->attr.name, "out_read_index")) { |
7bb52384 | 153 | ret = sprintf(buf, "%d\n", device_info->outbound.read_idx); |
98db4335 | 154 | } else if (!strcmp(dev_attr->attr.name, "out_write_index")) { |
7bb52384 | 155 | ret = sprintf(buf, "%d\n", device_info->outbound.write_idx); |
98db4335 | 156 | } else if (!strcmp(dev_attr->attr.name, "out_read_bytes_avail")) { |
7bb52384 S |
157 | ret = sprintf(buf, "%d\n", |
158 | device_info->outbound.bytes_avail_toread); | |
98db4335 | 159 | } else if (!strcmp(dev_attr->attr.name, "out_write_bytes_avail")) { |
7bb52384 S |
160 | ret = sprintf(buf, "%d\n", |
161 | device_info->outbound.bytes_avail_towrite); | |
98db4335 | 162 | } else if (!strcmp(dev_attr->attr.name, "in_intr_mask")) { |
7bb52384 | 163 | ret = sprintf(buf, "%d\n", device_info->inbound.int_mask); |
98db4335 | 164 | } else if (!strcmp(dev_attr->attr.name, "in_read_index")) { |
7bb52384 | 165 | ret = sprintf(buf, "%d\n", device_info->inbound.read_idx); |
98db4335 | 166 | } else if (!strcmp(dev_attr->attr.name, "in_write_index")) { |
7bb52384 | 167 | ret = sprintf(buf, "%d\n", device_info->inbound.write_idx); |
98db4335 | 168 | } else if (!strcmp(dev_attr->attr.name, "in_read_bytes_avail")) { |
7bb52384 S |
169 | ret = sprintf(buf, "%d\n", |
170 | device_info->inbound.bytes_avail_toread); | |
98db4335 | 171 | } else if (!strcmp(dev_attr->attr.name, "in_write_bytes_avail")) { |
7bb52384 S |
172 | ret = sprintf(buf, "%d\n", |
173 | device_info->inbound.bytes_avail_towrite); | |
98db4335 | 174 | } else if (!strcmp(dev_attr->attr.name, "server_monitor_pending")) { |
7bb52384 | 175 | ret = sprintf(buf, "%d\n", device_info->server_monitor_pending); |
98db4335 | 176 | } else if (!strcmp(dev_attr->attr.name, "server_monitor_latency")) { |
7bb52384 | 177 | ret = sprintf(buf, "%d\n", device_info->server_monitor_latency); |
98db4335 | 178 | } else if (!strcmp(dev_attr->attr.name, "server_monitor_conn_id")) { |
7bb52384 S |
179 | ret = sprintf(buf, "%d\n", |
180 | device_info->server_monitor_conn_id); | |
98db4335 | 181 | } else if (!strcmp(dev_attr->attr.name, "client_monitor_pending")) { |
7bb52384 | 182 | ret = sprintf(buf, "%d\n", device_info->client_monitor_pending); |
98db4335 | 183 | } else if (!strcmp(dev_attr->attr.name, "client_monitor_latency")) { |
7bb52384 | 184 | ret = sprintf(buf, "%d\n", device_info->client_monitor_latency); |
98db4335 | 185 | } else if (!strcmp(dev_attr->attr.name, "client_monitor_conn_id")) { |
7bb52384 S |
186 | ret = sprintf(buf, "%d\n", |
187 | device_info->client_monitor_conn_id); | |
98db4335 | 188 | } |
7bb52384 S |
189 | |
190 | kfree(device_info); | |
191 | return ret; | |
98db4335 | 192 | } |
3e7ee490 | 193 | |
03f3a910 GKH |
194 | static ssize_t id_show(struct device *dev, struct device_attribute *dev_attr, |
195 | char *buf) | |
196 | { | |
197 | struct hv_device *hv_dev = device_to_hv_device(dev); | |
198 | ||
199 | if (!hv_dev->channel) | |
200 | return -ENODEV; | |
201 | return sprintf(buf, "%d\n", hv_dev->channel->offermsg.child_relid); | |
202 | } | |
203 | static DEVICE_ATTR_RO(id); | |
204 | ||
a8fb5f3d GKH |
205 | static ssize_t state_show(struct device *dev, struct device_attribute *dev_attr, |
206 | char *buf) | |
207 | { | |
208 | struct hv_device *hv_dev = device_to_hv_device(dev); | |
209 | ||
210 | if (!hv_dev->channel) | |
211 | return -ENODEV; | |
212 | return sprintf(buf, "%d\n", hv_dev->channel->state); | |
213 | } | |
214 | static DEVICE_ATTR_RO(state); | |
215 | ||
5ffd00e2 GKH |
216 | static ssize_t monitor_id_show(struct device *dev, |
217 | struct device_attribute *dev_attr, char *buf) | |
218 | { | |
219 | struct hv_device *hv_dev = device_to_hv_device(dev); | |
220 | ||
221 | if (!hv_dev->channel) | |
222 | return -ENODEV; | |
223 | return sprintf(buf, "%d\n", hv_dev->channel->offermsg.monitorid); | |
224 | } | |
225 | static DEVICE_ATTR_RO(monitor_id); | |
226 | ||
03f3a910 GKH |
227 | static struct attribute *vmbus_attrs[] = { |
228 | &dev_attr_id.attr, | |
a8fb5f3d | 229 | &dev_attr_state.attr, |
5ffd00e2 | 230 | &dev_attr_monitor_id.attr, |
03f3a910 GKH |
231 | NULL, |
232 | }; | |
233 | ATTRIBUTE_GROUPS(vmbus); | |
234 | ||
454f18a9 | 235 | /* Set up per device attributes in /sys/bus/vmbus/devices/<bus device> */ |
3e7ee490 | 236 | static struct device_attribute vmbus_device_attrs[] = { |
3e7ee490 HJ |
237 | __ATTR(class_id, S_IRUGO, vmbus_show_device_attr, NULL), |
238 | __ATTR(device_id, S_IRUGO, vmbus_show_device_attr, NULL), | |
fd776ba9 | 239 | __ATTR(modalias, S_IRUGO, vmbus_show_device_attr, NULL), |
3e7ee490 HJ |
240 | |
241 | __ATTR(server_monitor_pending, S_IRUGO, vmbus_show_device_attr, NULL), | |
242 | __ATTR(server_monitor_latency, S_IRUGO, vmbus_show_device_attr, NULL), | |
243 | __ATTR(server_monitor_conn_id, S_IRUGO, vmbus_show_device_attr, NULL), | |
244 | ||
245 | __ATTR(client_monitor_pending, S_IRUGO, vmbus_show_device_attr, NULL), | |
246 | __ATTR(client_monitor_latency, S_IRUGO, vmbus_show_device_attr, NULL), | |
247 | __ATTR(client_monitor_conn_id, S_IRUGO, vmbus_show_device_attr, NULL), | |
248 | ||
249 | __ATTR(out_intr_mask, S_IRUGO, vmbus_show_device_attr, NULL), | |
250 | __ATTR(out_read_index, S_IRUGO, vmbus_show_device_attr, NULL), | |
251 | __ATTR(out_write_index, S_IRUGO, vmbus_show_device_attr, NULL), | |
252 | __ATTR(out_read_bytes_avail, S_IRUGO, vmbus_show_device_attr, NULL), | |
253 | __ATTR(out_write_bytes_avail, S_IRUGO, vmbus_show_device_attr, NULL), | |
254 | ||
255 | __ATTR(in_intr_mask, S_IRUGO, vmbus_show_device_attr, NULL), | |
256 | __ATTR(in_read_index, S_IRUGO, vmbus_show_device_attr, NULL), | |
257 | __ATTR(in_write_index, S_IRUGO, vmbus_show_device_attr, NULL), | |
258 | __ATTR(in_read_bytes_avail, S_IRUGO, vmbus_show_device_attr, NULL), | |
259 | __ATTR(in_write_bytes_avail, S_IRUGO, vmbus_show_device_attr, NULL), | |
260 | __ATTR_NULL | |
261 | }; | |
3e7ee490 | 262 | |
793be9c7 | 263 | |
adde2487 S |
264 | /* |
265 | * vmbus_uevent - add uevent for our device | |
266 | * | |
267 | * This routine is invoked when a device is added or removed on the vmbus to | |
268 | * generate a uevent to udev in the userspace. The udev will then look at its | |
269 | * rule and the uevent generated here to load the appropriate driver | |
0ddda660 S |
270 | * |
271 | * The alias string will be of the form vmbus:guid where guid is the string | |
272 | * representation of the device guid (each byte of the guid will be | |
273 | * represented with two hex characters. | |
adde2487 S |
274 | */ |
275 | static int vmbus_uevent(struct device *device, struct kobj_uevent_env *env) | |
276 | { | |
277 | struct hv_device *dev = device_to_hv_device(device); | |
fd776ba9 OH |
278 | int ret; |
279 | char alias_name[VMBUS_ALIAS_LEN + 1]; | |
0ddda660 | 280 | |
fd776ba9 | 281 | print_alias_name(dev, alias_name); |
0ddda660 S |
282 | ret = add_uevent_var(env, "MODALIAS=vmbus:%s", alias_name); |
283 | return ret; | |
adde2487 S |
284 | } |
285 | ||
5841a829 S |
286 | static uuid_le null_guid; |
287 | ||
288 | static inline bool is_null_guid(const __u8 *guid) | |
289 | { | |
290 | if (memcmp(guid, &null_guid, sizeof(uuid_le))) | |
291 | return false; | |
292 | return true; | |
293 | } | |
294 | ||
3037a7b6 S |
295 | /* |
296 | * Return a matching hv_vmbus_device_id pointer. | |
297 | * If there is no match, return NULL. | |
298 | */ | |
299 | static const struct hv_vmbus_device_id *hv_vmbus_get_id( | |
300 | const struct hv_vmbus_device_id *id, | |
301 | __u8 *guid) | |
302 | { | |
303 | for (; !is_null_guid(id->guid); id++) | |
304 | if (!memcmp(&id->guid, guid, sizeof(uuid_le))) | |
305 | return id; | |
306 | ||
307 | return NULL; | |
308 | } | |
309 | ||
310 | ||
b7fc147b S |
311 | |
312 | /* | |
313 | * vmbus_match - Attempt to match the specified device to the specified driver | |
314 | */ | |
315 | static int vmbus_match(struct device *device, struct device_driver *driver) | |
316 | { | |
b7fc147b | 317 | struct hv_driver *drv = drv_to_hv_drv(driver); |
e8e27047 | 318 | struct hv_device *hv_dev = device_to_hv_device(device); |
b7fc147b | 319 | |
3037a7b6 S |
320 | if (hv_vmbus_get_id(drv->id_table, hv_dev->dev_type.b)) |
321 | return 1; | |
de632a2b | 322 | |
5841a829 | 323 | return 0; |
b7fc147b S |
324 | } |
325 | ||
f1f0d67b S |
326 | /* |
327 | * vmbus_probe - Add the new vmbus's child device | |
328 | */ | |
329 | static int vmbus_probe(struct device *child_device) | |
330 | { | |
331 | int ret = 0; | |
332 | struct hv_driver *drv = | |
333 | drv_to_hv_drv(child_device->driver); | |
9efd21e1 | 334 | struct hv_device *dev = device_to_hv_device(child_device); |
84946899 | 335 | const struct hv_vmbus_device_id *dev_id; |
f1f0d67b | 336 | |
84946899 | 337 | dev_id = hv_vmbus_get_id(drv->id_table, dev->dev_type.b); |
9efd21e1 | 338 | if (drv->probe) { |
84946899 | 339 | ret = drv->probe(dev, dev_id); |
b14a7b30 | 340 | if (ret != 0) |
0a46618d HJ |
341 | pr_err("probe failed for device %s (%d)\n", |
342 | dev_name(child_device), ret); | |
f1f0d67b | 343 | |
f1f0d67b | 344 | } else { |
0a46618d HJ |
345 | pr_err("probe not set for driver %s\n", |
346 | dev_name(child_device)); | |
6de925b1 | 347 | ret = -ENODEV; |
f1f0d67b S |
348 | } |
349 | return ret; | |
350 | } | |
351 | ||
c5dce3db S |
352 | /* |
353 | * vmbus_remove - Remove a vmbus device | |
354 | */ | |
355 | static int vmbus_remove(struct device *child_device) | |
356 | { | |
d4372179 | 357 | struct hv_driver *drv = drv_to_hv_drv(child_device->driver); |
415b023a | 358 | struct hv_device *dev = device_to_hv_device(child_device); |
c5dce3db | 359 | |
d4372179 S |
360 | if (drv->remove) |
361 | drv->remove(dev); | |
362 | else | |
363 | pr_err("remove not set for driver %s\n", | |
364 | dev_name(child_device)); | |
c5dce3db S |
365 | |
366 | return 0; | |
367 | } | |
368 | ||
eb1bb259 S |
369 | |
370 | /* | |
371 | * vmbus_shutdown - Shutdown a vmbus device | |
372 | */ | |
373 | static void vmbus_shutdown(struct device *child_device) | |
374 | { | |
375 | struct hv_driver *drv; | |
ca6887fb | 376 | struct hv_device *dev = device_to_hv_device(child_device); |
eb1bb259 S |
377 | |
378 | ||
379 | /* The device may not be attached yet */ | |
380 | if (!child_device->driver) | |
381 | return; | |
382 | ||
383 | drv = drv_to_hv_drv(child_device->driver); | |
384 | ||
ca6887fb S |
385 | if (drv->shutdown) |
386 | drv->shutdown(dev); | |
eb1bb259 S |
387 | |
388 | return; | |
389 | } | |
390 | ||
086e7a56 S |
391 | |
392 | /* | |
393 | * vmbus_device_release - Final callback release of the vmbus child device | |
394 | */ | |
395 | static void vmbus_device_release(struct device *device) | |
396 | { | |
e8e27047 | 397 | struct hv_device *hv_dev = device_to_hv_device(device); |
086e7a56 | 398 | |
e8e27047 | 399 | kfree(hv_dev); |
086e7a56 S |
400 | |
401 | } | |
402 | ||
454f18a9 | 403 | /* The one and only one */ |
9adcac5c S |
404 | static struct bus_type hv_bus = { |
405 | .name = "vmbus", | |
406 | .match = vmbus_match, | |
407 | .shutdown = vmbus_shutdown, | |
408 | .remove = vmbus_remove, | |
409 | .probe = vmbus_probe, | |
410 | .uevent = vmbus_uevent, | |
411 | .dev_attrs = vmbus_device_attrs, | |
03f3a910 | 412 | .dev_groups = vmbus_groups, |
3e7ee490 HJ |
413 | }; |
414 | ||
adf874cb | 415 | static const char *driver_name = "hyperv"; |
36199a99 | 416 | |
36199a99 | 417 | |
bf6506f6 TT |
418 | struct onmessage_work_context { |
419 | struct work_struct work; | |
420 | struct hv_message msg; | |
421 | }; | |
422 | ||
423 | static void vmbus_onmessage_work(struct work_struct *work) | |
424 | { | |
425 | struct onmessage_work_context *ctx; | |
426 | ||
427 | ctx = container_of(work, struct onmessage_work_context, | |
428 | work); | |
429 | vmbus_onmessage(&ctx->msg); | |
430 | kfree(ctx); | |
431 | } | |
432 | ||
62c1059d | 433 | static void vmbus_on_msg_dpc(unsigned long data) |
36199a99 GKH |
434 | { |
435 | int cpu = smp_processor_id(); | |
436 | void *page_addr = hv_context.synic_message_page[cpu]; | |
437 | struct hv_message *msg = (struct hv_message *)page_addr + | |
438 | VMBUS_MESSAGE_SINT; | |
bf6506f6 | 439 | struct onmessage_work_context *ctx; |
36199a99 GKH |
440 | |
441 | while (1) { | |
442 | if (msg->header.message_type == HVMSG_NONE) { | |
443 | /* no msg */ | |
444 | break; | |
445 | } else { | |
bf6506f6 TT |
446 | ctx = kmalloc(sizeof(*ctx), GFP_ATOMIC); |
447 | if (ctx == NULL) | |
36199a99 | 448 | continue; |
bf6506f6 TT |
449 | INIT_WORK(&ctx->work, vmbus_onmessage_work); |
450 | memcpy(&ctx->msg, msg, sizeof(*msg)); | |
da9fcb72 | 451 | queue_work(vmbus_connection.work_queue, &ctx->work); |
36199a99 GKH |
452 | } |
453 | ||
454 | msg->header.message_type = HVMSG_NONE; | |
455 | ||
456 | /* | |
457 | * Make sure the write to MessageType (ie set to | |
458 | * HVMSG_NONE) happens before we read the | |
459 | * MessagePending and EOMing. Otherwise, the EOMing | |
460 | * will not deliver any more messages since there is | |
461 | * no empty slot | |
462 | */ | |
35848f68 | 463 | mb(); |
36199a99 GKH |
464 | |
465 | if (msg->header.message_flags.msg_pending) { | |
466 | /* | |
467 | * This will cause message queue rescan to | |
468 | * possibly deliver another msg from the | |
469 | * hypervisor | |
470 | */ | |
471 | wrmsrl(HV_X64_MSR_EOM, 0); | |
472 | } | |
473 | } | |
474 | } | |
475 | ||
ae4636e6 | 476 | static irqreturn_t vmbus_isr(int irq, void *dev_id) |
36199a99 | 477 | { |
36199a99 GKH |
478 | int cpu = smp_processor_id(); |
479 | void *page_addr; | |
480 | struct hv_message *msg; | |
481 | union hv_synic_event_flags *event; | |
ae4636e6 | 482 | bool handled = false; |
36199a99 | 483 | |
5ab05951 S |
484 | page_addr = hv_context.synic_event_page[cpu]; |
485 | if (page_addr == NULL) | |
486 | return IRQ_NONE; | |
487 | ||
488 | event = (union hv_synic_event_flags *)page_addr + | |
489 | VMBUS_MESSAGE_SINT; | |
7341d908 S |
490 | /* |
491 | * Check for events before checking for messages. This is the order | |
492 | * in which events and messages are checked in Windows guests on | |
493 | * Hyper-V, and the Windows team suggested we do the same. | |
494 | */ | |
36199a99 | 495 | |
6552ecd7 S |
496 | if ((vmbus_proto_version == VERSION_WS2008) || |
497 | (vmbus_proto_version == VERSION_WIN7)) { | |
36199a99 | 498 | |
6552ecd7 S |
499 | /* Since we are a child, we only need to check bit 0 */ |
500 | if (sync_test_and_clear_bit(0, | |
501 | (unsigned long *) &event->flags32[0])) { | |
502 | handled = true; | |
503 | } | |
504 | } else { | |
505 | /* | |
506 | * Our host is win8 or above. The signaling mechanism | |
507 | * has changed and we can directly look at the event page. | |
508 | * If bit n is set then we have an interrup on the channel | |
509 | * whose id is n. | |
510 | */ | |
ae4636e6 | 511 | handled = true; |
ae4636e6 | 512 | } |
793be9c7 | 513 | |
6552ecd7 | 514 | if (handled) |
db11f12a | 515 | tasklet_schedule(hv_context.event_dpc[cpu]); |
6552ecd7 S |
516 | |
517 | ||
7341d908 S |
518 | page_addr = hv_context.synic_message_page[cpu]; |
519 | msg = (struct hv_message *)page_addr + VMBUS_MESSAGE_SINT; | |
520 | ||
521 | /* Check if there are actual msgs to be processed */ | |
522 | if (msg->header.message_type != HVMSG_NONE) { | |
523 | handled = true; | |
524 | tasklet_schedule(&msg_dpc); | |
525 | } | |
526 | ||
ae4636e6 | 527 | if (handled) |
793be9c7 | 528 | return IRQ_HANDLED; |
ae4636e6 | 529 | else |
793be9c7 | 530 | return IRQ_NONE; |
793be9c7 S |
531 | } |
532 | ||
b0209501 S |
533 | /* |
534 | * vmbus interrupt flow handler: | |
535 | * vmbus interrupts can concurrently occur on multiple CPUs and | |
536 | * can be handled concurrently. | |
537 | */ | |
538 | ||
83ebf6e5 | 539 | static void vmbus_flow_handler(unsigned int irq, struct irq_desc *desc) |
b0209501 S |
540 | { |
541 | kstat_incr_irqs_this_cpu(irq, desc); | |
542 | ||
543 | desc->action->handler(irq, desc->action->dev_id); | |
544 | } | |
545 | ||
3e189519 | 546 | /* |
90c9960e GKH |
547 | * vmbus_bus_init -Main vmbus driver initialization routine. |
548 | * | |
549 | * Here, we | |
0686e4f4 | 550 | * - initialize the vmbus driver context |
0686e4f4 LL |
551 | * - invoke the vmbus hv main init routine |
552 | * - get the irq resource | |
0686e4f4 | 553 | * - retrieve the channel offers |
90c9960e | 554 | */ |
9aaa995e | 555 | static int vmbus_bus_init(int irq) |
3e7ee490 | 556 | { |
90c9960e | 557 | int ret; |
3e7ee490 | 558 | |
6d26e38f GKH |
559 | /* Hypervisor initialization...setup hypercall page..etc */ |
560 | ret = hv_init(); | |
90c9960e | 561 | if (ret != 0) { |
0a46618d | 562 | pr_err("Unable to initialize the hypervisor - 0x%x\n", ret); |
d6c1c5de | 563 | return ret; |
3e7ee490 HJ |
564 | } |
565 | ||
59c0e4f0 | 566 | tasklet_init(&msg_dpc, vmbus_on_msg_dpc, 0); |
3e7ee490 | 567 | |
9adcac5c | 568 | ret = bus_register(&hv_bus); |
d6c1c5de | 569 | if (ret) |
8b9987e9 | 570 | goto err_cleanup; |
3e7ee490 | 571 | |
20ed3ef7 | 572 | ret = request_irq(irq, vmbus_isr, 0, driver_name, hv_acpi_dev); |
3e7ee490 | 573 | |
90c9960e | 574 | if (ret != 0) { |
0a46618d | 575 | pr_err("Unable to request IRQ %d\n", |
9aaa995e | 576 | irq); |
8b9987e9 | 577 | goto err_unregister; |
3e7ee490 | 578 | } |
3e7ee490 | 579 | |
b0209501 S |
580 | /* |
581 | * Vmbus interrupts can be handled concurrently on | |
582 | * different CPUs. Establish an appropriate interrupt flow | |
583 | * handler that can support this model. | |
584 | */ | |
585 | irq_set_handler(irq, vmbus_flow_handler); | |
586 | ||
302a3c0f S |
587 | /* |
588 | * Register our interrupt handler. | |
589 | */ | |
590 | hv_register_vmbus_handler(irq, vmbus_isr); | |
3e7ee490 | 591 | |
2608fb65 JW |
592 | ret = hv_synic_alloc(); |
593 | if (ret) | |
594 | goto err_alloc; | |
800b6902 | 595 | /* |
302a3c0f | 596 | * Initialize the per-cpu interrupt state and |
800b6902 S |
597 | * connect to the host. |
598 | */ | |
302a3c0f | 599 | on_each_cpu(hv_synic_init, NULL, 1); |
800b6902 | 600 | ret = vmbus_connect(); |
8b9987e9 | 601 | if (ret) |
2608fb65 | 602 | goto err_alloc; |
800b6902 | 603 | |
2d6e882b | 604 | vmbus_request_offers(); |
8b5d6d3b | 605 | |
d6c1c5de | 606 | return 0; |
8b9987e9 | 607 | |
2608fb65 JW |
608 | err_alloc: |
609 | hv_synic_free(); | |
8b9987e9 S |
610 | free_irq(irq, hv_acpi_dev); |
611 | ||
612 | err_unregister: | |
613 | bus_unregister(&hv_bus); | |
614 | ||
615 | err_cleanup: | |
616 | hv_cleanup(); | |
617 | ||
618 | return ret; | |
3e7ee490 HJ |
619 | } |
620 | ||
90c9960e | 621 | /** |
768fa219 GKH |
622 | * __vmbus_child_driver_register - Register a vmbus's driver |
623 | * @drv: Pointer to driver structure you want to register | |
624 | * @owner: owner module of the drv | |
625 | * @mod_name: module name string | |
3e189519 HJ |
626 | * |
627 | * Registers the given driver with Linux through the 'driver_register()' call | |
768fa219 | 628 | * and sets up the hyper-v vmbus handling for this driver. |
3e189519 HJ |
629 | * It will return the state of the 'driver_register()' call. |
630 | * | |
90c9960e | 631 | */ |
768fa219 | 632 | int __vmbus_driver_register(struct hv_driver *hv_driver, struct module *owner, const char *mod_name) |
3e7ee490 | 633 | { |
5d48a1c2 | 634 | int ret; |
3e7ee490 | 635 | |
768fa219 | 636 | pr_info("registering driver %s\n", hv_driver->name); |
3e7ee490 | 637 | |
cf6a2eac S |
638 | ret = vmbus_exists(); |
639 | if (ret < 0) | |
640 | return ret; | |
641 | ||
768fa219 GKH |
642 | hv_driver->driver.name = hv_driver->name; |
643 | hv_driver->driver.owner = owner; | |
644 | hv_driver->driver.mod_name = mod_name; | |
645 | hv_driver->driver.bus = &hv_bus; | |
3e7ee490 | 646 | |
768fa219 | 647 | ret = driver_register(&hv_driver->driver); |
3e7ee490 | 648 | |
5d48a1c2 | 649 | return ret; |
3e7ee490 | 650 | } |
768fa219 | 651 | EXPORT_SYMBOL_GPL(__vmbus_driver_register); |
3e7ee490 | 652 | |
90c9960e | 653 | /** |
768fa219 GKH |
654 | * vmbus_driver_unregister() - Unregister a vmbus's driver |
655 | * @drv: Pointer to driver structure you want to un-register | |
3e189519 | 656 | * |
768fa219 GKH |
657 | * Un-register the given driver that was previous registered with a call to |
658 | * vmbus_driver_register() | |
90c9960e | 659 | */ |
768fa219 | 660 | void vmbus_driver_unregister(struct hv_driver *hv_driver) |
3e7ee490 | 661 | { |
768fa219 | 662 | pr_info("unregistering driver %s\n", hv_driver->name); |
3e7ee490 | 663 | |
cf6a2eac | 664 | if (!vmbus_exists()) |
8f257a14 | 665 | driver_unregister(&hv_driver->driver); |
3e7ee490 | 666 | } |
768fa219 | 667 | EXPORT_SYMBOL_GPL(vmbus_driver_unregister); |
3e7ee490 | 668 | |
3e189519 | 669 | /* |
f2c73011 | 670 | * vmbus_device_create - Creates and registers a new child device |
3e189519 | 671 | * on the vmbus. |
90c9960e | 672 | */ |
f2c73011 | 673 | struct hv_device *vmbus_device_create(uuid_le *type, |
358d2ee2 | 674 | uuid_le *instance, |
89733aa9 | 675 | struct vmbus_channel *channel) |
3e7ee490 | 676 | { |
3d3b5518 | 677 | struct hv_device *child_device_obj; |
3e7ee490 | 678 | |
6bad88da S |
679 | child_device_obj = kzalloc(sizeof(struct hv_device), GFP_KERNEL); |
680 | if (!child_device_obj) { | |
0a46618d | 681 | pr_err("Unable to allocate device object for child device\n"); |
3e7ee490 HJ |
682 | return NULL; |
683 | } | |
684 | ||
cae5b843 | 685 | child_device_obj->channel = channel; |
358d2ee2 | 686 | memcpy(&child_device_obj->dev_type, type, sizeof(uuid_le)); |
ca623ad3 | 687 | memcpy(&child_device_obj->dev_instance, instance, |
358d2ee2 | 688 | sizeof(uuid_le)); |
3e7ee490 | 689 | |
3e7ee490 | 690 | |
3e7ee490 HJ |
691 | return child_device_obj; |
692 | } | |
693 | ||
3e189519 | 694 | /* |
22794281 | 695 | * vmbus_device_register - Register the child device |
90c9960e | 696 | */ |
22794281 | 697 | int vmbus_device_register(struct hv_device *child_device_obj) |
3e7ee490 | 698 | { |
90c9960e | 699 | int ret = 0; |
6bad88da | 700 | |
f4888417 | 701 | static atomic_t device_num = ATOMIC_INIT(0); |
3e7ee490 | 702 | |
6bad88da | 703 | dev_set_name(&child_device_obj->device, "vmbus_0_%d", |
90c9960e | 704 | atomic_inc_return(&device_num)); |
3e7ee490 | 705 | |
0bce28b6 | 706 | child_device_obj->device.bus = &hv_bus; |
607c1a11 | 707 | child_device_obj->device.parent = &hv_acpi_dev->dev; |
6bad88da | 708 | child_device_obj->device.release = vmbus_device_release; |
3e7ee490 | 709 | |
90c9960e GKH |
710 | /* |
711 | * Register with the LDM. This will kick off the driver/device | |
712 | * binding...which will eventually call vmbus_match() and vmbus_probe() | |
713 | */ | |
6bad88da | 714 | ret = device_register(&child_device_obj->device); |
3e7ee490 | 715 | |
3e7ee490 | 716 | if (ret) |
0a46618d | 717 | pr_err("Unable to register child device\n"); |
3e7ee490 | 718 | else |
84672369 | 719 | pr_debug("child device %s registered\n", |
0a46618d | 720 | dev_name(&child_device_obj->device)); |
3e7ee490 | 721 | |
3e7ee490 HJ |
722 | return ret; |
723 | } | |
724 | ||
3e189519 | 725 | /* |
696453ba | 726 | * vmbus_device_unregister - Remove the specified child device |
3e189519 | 727 | * from the vmbus. |
90c9960e | 728 | */ |
696453ba | 729 | void vmbus_device_unregister(struct hv_device *device_obj) |
3e7ee490 | 730 | { |
84672369 FS |
731 | pr_debug("child device %s unregistered\n", |
732 | dev_name(&device_obj->device)); | |
733 | ||
90c9960e GKH |
734 | /* |
735 | * Kick off the process of unregistering the device. | |
736 | * This will call vmbus_remove() and eventually vmbus_device_release() | |
737 | */ | |
6bad88da | 738 | device_unregister(&device_obj->device); |
3e7ee490 HJ |
739 | } |
740 | ||
3e7ee490 | 741 | |
b0069f43 S |
742 | /* |
743 | * VMBUS is an acpi enumerated device. Get the the IRQ information | |
744 | * from DSDT. | |
745 | */ | |
746 | ||
747 | static acpi_status vmbus_walk_resources(struct acpi_resource *res, void *irq) | |
748 | { | |
749 | ||
750 | if (res->type == ACPI_RESOURCE_TYPE_IRQ) { | |
751 | struct acpi_resource_irq *irqp; | |
752 | irqp = &res->data.irq; | |
753 | ||
754 | *((unsigned int *)irq) = irqp->interrupts[0]; | |
755 | } | |
756 | ||
757 | return AE_OK; | |
758 | } | |
759 | ||
760 | static int vmbus_acpi_add(struct acpi_device *device) | |
761 | { | |
762 | acpi_status result; | |
763 | ||
607c1a11 S |
764 | hv_acpi_dev = device; |
765 | ||
0a4425b6 S |
766 | result = acpi_walk_resources(device->handle, METHOD_NAME__CRS, |
767 | vmbus_walk_resources, &irq); | |
b0069f43 S |
768 | |
769 | if (ACPI_FAILURE(result)) { | |
770 | complete(&probe_event); | |
771 | return -ENODEV; | |
772 | } | |
773 | complete(&probe_event); | |
774 | return 0; | |
775 | } | |
776 | ||
777 | static const struct acpi_device_id vmbus_acpi_device_ids[] = { | |
778 | {"VMBUS", 0}, | |
9d7b18d1 | 779 | {"VMBus", 0}, |
b0069f43 S |
780 | {"", 0}, |
781 | }; | |
782 | MODULE_DEVICE_TABLE(acpi, vmbus_acpi_device_ids); | |
783 | ||
784 | static struct acpi_driver vmbus_acpi_driver = { | |
785 | .name = "vmbus", | |
786 | .ids = vmbus_acpi_device_ids, | |
787 | .ops = { | |
788 | .add = vmbus_acpi_add, | |
789 | }, | |
790 | }; | |
791 | ||
607c1a11 | 792 | static int __init hv_acpi_init(void) |
1168ac22 | 793 | { |
2dda95f8 | 794 | int ret, t; |
b0069f43 | 795 | |
1f94ea81 | 796 | if (x86_hyper != &x86_hyper_ms_hyperv) |
0592969e JW |
797 | return -ENODEV; |
798 | ||
b0069f43 S |
799 | init_completion(&probe_event); |
800 | ||
801 | /* | |
802 | * Get irq resources first. | |
803 | */ | |
804 | ||
0246604c S |
805 | ret = acpi_bus_register_driver(&vmbus_acpi_driver); |
806 | ||
b0069f43 S |
807 | if (ret) |
808 | return ret; | |
809 | ||
2dda95f8 S |
810 | t = wait_for_completion_timeout(&probe_event, 5*HZ); |
811 | if (t == 0) { | |
812 | ret = -ETIMEDOUT; | |
813 | goto cleanup; | |
814 | } | |
b0069f43 S |
815 | |
816 | if (irq <= 0) { | |
2dda95f8 S |
817 | ret = -ENODEV; |
818 | goto cleanup; | |
b0069f43 S |
819 | } |
820 | ||
91fd799e S |
821 | ret = vmbus_bus_init(irq); |
822 | if (ret) | |
2dda95f8 S |
823 | goto cleanup; |
824 | ||
825 | return 0; | |
826 | ||
827 | cleanup: | |
828 | acpi_bus_unregister_driver(&vmbus_acpi_driver); | |
cf6a2eac | 829 | hv_acpi_dev = NULL; |
91fd799e | 830 | return ret; |
1168ac22 S |
831 | } |
832 | ||
93e5bd06 S |
833 | static void __exit vmbus_exit(void) |
834 | { | |
835 | ||
836 | free_irq(irq, hv_acpi_dev); | |
837 | vmbus_free_channels(); | |
838 | bus_unregister(&hv_bus); | |
839 | hv_cleanup(); | |
840 | acpi_bus_unregister_driver(&vmbus_acpi_driver); | |
841 | } | |
842 | ||
1168ac22 | 843 | |
90c9960e | 844 | MODULE_LICENSE("GPL"); |
3e7ee490 | 845 | |
43d4e119 | 846 | subsys_initcall(hv_acpi_init); |
93e5bd06 | 847 | module_exit(vmbus_exit); |