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> |
407dd164 | 36 | #include <asm/hyperv.h> |
0f2a6619 | 37 | #include "hyperv_vmbus.h" |
3e7ee490 | 38 | |
3e7ee490 | 39 | |
607c1a11 | 40 | static struct acpi_device *hv_acpi_dev; |
1168ac22 | 41 | |
59c0e4f0 | 42 | static struct tasklet_struct msg_dpc; |
66d9229c | 43 | static struct tasklet_struct event_dpc; |
71a6655d | 44 | static struct completion probe_event; |
b0069f43 | 45 | static int irq; |
98db4335 | 46 | |
15b80d64 GKH |
47 | struct hv_device_info { |
48 | u32 chn_id; | |
49 | u32 chn_state; | |
50 | uuid_le chn_type; | |
51 | uuid_le chn_instance; | |
52 | ||
53 | u32 monitor_id; | |
54 | u32 server_monitor_pending; | |
55 | u32 server_monitor_latency; | |
56 | u32 server_monitor_conn_id; | |
57 | u32 client_monitor_pending; | |
58 | u32 client_monitor_latency; | |
59 | u32 client_monitor_conn_id; | |
60 | ||
61 | struct hv_dev_port_info inbound; | |
62 | struct hv_dev_port_info outbound; | |
63 | }; | |
64 | ||
65 | ||
98db4335 S |
66 | static void get_channel_info(struct hv_device *device, |
67 | struct hv_device_info *info) | |
68 | { | |
69 | struct vmbus_channel_debug_info debug_info; | |
70 | ||
71 | if (!device->channel) | |
72 | return; | |
73 | ||
74 | vmbus_get_debug_info(device->channel, &debug_info); | |
75 | ||
76 | info->chn_id = debug_info.relid; | |
77 | info->chn_state = debug_info.state; | |
78 | memcpy(&info->chn_type, &debug_info.interfacetype, | |
358d2ee2 | 79 | sizeof(uuid_le)); |
98db4335 | 80 | memcpy(&info->chn_instance, &debug_info.interface_instance, |
358d2ee2 | 81 | sizeof(uuid_le)); |
98db4335 S |
82 | |
83 | info->monitor_id = debug_info.monitorid; | |
84 | ||
85 | info->server_monitor_pending = debug_info.servermonitor_pending; | |
86 | info->server_monitor_latency = debug_info.servermonitor_latency; | |
87 | info->server_monitor_conn_id = debug_info.servermonitor_connectionid; | |
88 | ||
89 | info->client_monitor_pending = debug_info.clientmonitor_pending; | |
90 | info->client_monitor_latency = debug_info.clientmonitor_latency; | |
91 | info->client_monitor_conn_id = debug_info.clientmonitor_connectionid; | |
92 | ||
93 | info->inbound.int_mask = debug_info.inbound.current_interrupt_mask; | |
94 | info->inbound.read_idx = debug_info.inbound.current_read_index; | |
95 | info->inbound.write_idx = debug_info.inbound.current_write_index; | |
96 | info->inbound.bytes_avail_toread = | |
97 | debug_info.inbound.bytes_avail_toread; | |
98 | info->inbound.bytes_avail_towrite = | |
99 | debug_info.inbound.bytes_avail_towrite; | |
3e7ee490 | 100 | |
98db4335 S |
101 | info->outbound.int_mask = |
102 | debug_info.outbound.current_interrupt_mask; | |
103 | info->outbound.read_idx = debug_info.outbound.current_read_index; | |
104 | info->outbound.write_idx = debug_info.outbound.current_write_index; | |
105 | info->outbound.bytes_avail_toread = | |
106 | debug_info.outbound.bytes_avail_toread; | |
107 | info->outbound.bytes_avail_towrite = | |
108 | debug_info.outbound.bytes_avail_towrite; | |
109 | } | |
3e7ee490 | 110 | |
fd776ba9 OH |
111 | #define VMBUS_ALIAS_LEN ((sizeof((struct hv_vmbus_device_id *)0)->guid) * 2) |
112 | static void print_alias_name(struct hv_device *hv_dev, char *alias_name) | |
113 | { | |
114 | int i; | |
115 | for (i = 0; i < VMBUS_ALIAS_LEN; i += 2) | |
116 | sprintf(&alias_name[i], "%02x", hv_dev->dev_type.b[i/2]); | |
117 | } | |
118 | ||
98db4335 S |
119 | /* |
120 | * vmbus_show_device_attr - Show the device attribute in sysfs. | |
121 | * | |
122 | * This is invoked when user does a | |
123 | * "cat /sys/bus/vmbus/devices/<busdevice>/<attr name>" | |
124 | */ | |
90c9960e GKH |
125 | static ssize_t vmbus_show_device_attr(struct device *dev, |
126 | struct device_attribute *dev_attr, | |
98db4335 S |
127 | char *buf) |
128 | { | |
e8e27047 | 129 | struct hv_device *hv_dev = device_to_hv_device(dev); |
7bb52384 | 130 | struct hv_device_info *device_info; |
fd776ba9 | 131 | char alias_name[VMBUS_ALIAS_LEN + 1]; |
7bb52384 | 132 | int ret = 0; |
3e7ee490 | 133 | |
7bb52384 S |
134 | device_info = kzalloc(sizeof(struct hv_device_info), GFP_KERNEL); |
135 | if (!device_info) | |
136 | return ret; | |
3e7ee490 | 137 | |
7bb52384 | 138 | get_channel_info(hv_dev, device_info); |
3e7ee490 | 139 | |
98db4335 | 140 | if (!strcmp(dev_attr->attr.name, "class_id")) { |
7bb52384 | 141 | ret = sprintf(buf, "{%02x%02x%02x%02x-%02x%02x-%02x%02x-" |
98db4335 | 142 | "%02x%02x%02x%02x%02x%02x%02x%02x}\n", |
7bb52384 S |
143 | device_info->chn_type.b[3], |
144 | device_info->chn_type.b[2], | |
145 | device_info->chn_type.b[1], | |
146 | device_info->chn_type.b[0], | |
147 | device_info->chn_type.b[5], | |
148 | device_info->chn_type.b[4], | |
149 | device_info->chn_type.b[7], | |
150 | device_info->chn_type.b[6], | |
151 | device_info->chn_type.b[8], | |
152 | device_info->chn_type.b[9], | |
153 | device_info->chn_type.b[10], | |
154 | device_info->chn_type.b[11], | |
155 | device_info->chn_type.b[12], | |
156 | device_info->chn_type.b[13], | |
157 | device_info->chn_type.b[14], | |
158 | device_info->chn_type.b[15]); | |
98db4335 | 159 | } else if (!strcmp(dev_attr->attr.name, "device_id")) { |
7bb52384 | 160 | ret = sprintf(buf, "{%02x%02x%02x%02x-%02x%02x-%02x%02x-" |
98db4335 | 161 | "%02x%02x%02x%02x%02x%02x%02x%02x}\n", |
7bb52384 S |
162 | device_info->chn_instance.b[3], |
163 | device_info->chn_instance.b[2], | |
164 | device_info->chn_instance.b[1], | |
165 | device_info->chn_instance.b[0], | |
166 | device_info->chn_instance.b[5], | |
167 | device_info->chn_instance.b[4], | |
168 | device_info->chn_instance.b[7], | |
169 | device_info->chn_instance.b[6], | |
170 | device_info->chn_instance.b[8], | |
171 | device_info->chn_instance.b[9], | |
172 | device_info->chn_instance.b[10], | |
173 | device_info->chn_instance.b[11], | |
174 | device_info->chn_instance.b[12], | |
175 | device_info->chn_instance.b[13], | |
176 | device_info->chn_instance.b[14], | |
177 | device_info->chn_instance.b[15]); | |
fd776ba9 OH |
178 | } else if (!strcmp(dev_attr->attr.name, "modalias")) { |
179 | print_alias_name(hv_dev, alias_name); | |
7bb52384 | 180 | ret = sprintf(buf, "vmbus:%s\n", alias_name); |
98db4335 | 181 | } else if (!strcmp(dev_attr->attr.name, "state")) { |
7bb52384 | 182 | ret = sprintf(buf, "%d\n", device_info->chn_state); |
98db4335 | 183 | } else if (!strcmp(dev_attr->attr.name, "id")) { |
7bb52384 | 184 | ret = sprintf(buf, "%d\n", device_info->chn_id); |
98db4335 | 185 | } else if (!strcmp(dev_attr->attr.name, "out_intr_mask")) { |
7bb52384 | 186 | ret = sprintf(buf, "%d\n", device_info->outbound.int_mask); |
98db4335 | 187 | } else if (!strcmp(dev_attr->attr.name, "out_read_index")) { |
7bb52384 | 188 | ret = sprintf(buf, "%d\n", device_info->outbound.read_idx); |
98db4335 | 189 | } else if (!strcmp(dev_attr->attr.name, "out_write_index")) { |
7bb52384 | 190 | ret = sprintf(buf, "%d\n", device_info->outbound.write_idx); |
98db4335 | 191 | } else if (!strcmp(dev_attr->attr.name, "out_read_bytes_avail")) { |
7bb52384 S |
192 | ret = sprintf(buf, "%d\n", |
193 | device_info->outbound.bytes_avail_toread); | |
98db4335 | 194 | } else if (!strcmp(dev_attr->attr.name, "out_write_bytes_avail")) { |
7bb52384 S |
195 | ret = sprintf(buf, "%d\n", |
196 | device_info->outbound.bytes_avail_towrite); | |
98db4335 | 197 | } else if (!strcmp(dev_attr->attr.name, "in_intr_mask")) { |
7bb52384 | 198 | ret = sprintf(buf, "%d\n", device_info->inbound.int_mask); |
98db4335 | 199 | } else if (!strcmp(dev_attr->attr.name, "in_read_index")) { |
7bb52384 | 200 | ret = sprintf(buf, "%d\n", device_info->inbound.read_idx); |
98db4335 | 201 | } else if (!strcmp(dev_attr->attr.name, "in_write_index")) { |
7bb52384 | 202 | ret = sprintf(buf, "%d\n", device_info->inbound.write_idx); |
98db4335 | 203 | } else if (!strcmp(dev_attr->attr.name, "in_read_bytes_avail")) { |
7bb52384 S |
204 | ret = sprintf(buf, "%d\n", |
205 | device_info->inbound.bytes_avail_toread); | |
98db4335 | 206 | } else if (!strcmp(dev_attr->attr.name, "in_write_bytes_avail")) { |
7bb52384 S |
207 | ret = sprintf(buf, "%d\n", |
208 | device_info->inbound.bytes_avail_towrite); | |
98db4335 | 209 | } else if (!strcmp(dev_attr->attr.name, "monitor_id")) { |
7bb52384 | 210 | ret = sprintf(buf, "%d\n", device_info->monitor_id); |
98db4335 | 211 | } else if (!strcmp(dev_attr->attr.name, "server_monitor_pending")) { |
7bb52384 | 212 | ret = sprintf(buf, "%d\n", device_info->server_monitor_pending); |
98db4335 | 213 | } else if (!strcmp(dev_attr->attr.name, "server_monitor_latency")) { |
7bb52384 | 214 | ret = sprintf(buf, "%d\n", device_info->server_monitor_latency); |
98db4335 | 215 | } else if (!strcmp(dev_attr->attr.name, "server_monitor_conn_id")) { |
7bb52384 S |
216 | ret = sprintf(buf, "%d\n", |
217 | device_info->server_monitor_conn_id); | |
98db4335 | 218 | } else if (!strcmp(dev_attr->attr.name, "client_monitor_pending")) { |
7bb52384 | 219 | ret = sprintf(buf, "%d\n", device_info->client_monitor_pending); |
98db4335 | 220 | } else if (!strcmp(dev_attr->attr.name, "client_monitor_latency")) { |
7bb52384 | 221 | ret = sprintf(buf, "%d\n", device_info->client_monitor_latency); |
98db4335 | 222 | } else if (!strcmp(dev_attr->attr.name, "client_monitor_conn_id")) { |
7bb52384 S |
223 | ret = sprintf(buf, "%d\n", |
224 | device_info->client_monitor_conn_id); | |
98db4335 | 225 | } |
7bb52384 S |
226 | |
227 | kfree(device_info); | |
228 | return ret; | |
98db4335 | 229 | } |
3e7ee490 | 230 | |
454f18a9 | 231 | /* Set up per device attributes in /sys/bus/vmbus/devices/<bus device> */ |
3e7ee490 HJ |
232 | static struct device_attribute vmbus_device_attrs[] = { |
233 | __ATTR(id, S_IRUGO, vmbus_show_device_attr, NULL), | |
234 | __ATTR(state, S_IRUGO, vmbus_show_device_attr, NULL), | |
235 | __ATTR(class_id, S_IRUGO, vmbus_show_device_attr, NULL), | |
236 | __ATTR(device_id, S_IRUGO, vmbus_show_device_attr, NULL), | |
237 | __ATTR(monitor_id, S_IRUGO, vmbus_show_device_attr, NULL), | |
fd776ba9 | 238 | __ATTR(modalias, S_IRUGO, vmbus_show_device_attr, NULL), |
3e7ee490 HJ |
239 | |
240 | __ATTR(server_monitor_pending, S_IRUGO, vmbus_show_device_attr, NULL), | |
241 | __ATTR(server_monitor_latency, S_IRUGO, vmbus_show_device_attr, NULL), | |
242 | __ATTR(server_monitor_conn_id, S_IRUGO, vmbus_show_device_attr, NULL), | |
243 | ||
244 | __ATTR(client_monitor_pending, S_IRUGO, vmbus_show_device_attr, NULL), | |
245 | __ATTR(client_monitor_latency, S_IRUGO, vmbus_show_device_attr, NULL), | |
246 | __ATTR(client_monitor_conn_id, S_IRUGO, vmbus_show_device_attr, NULL), | |
247 | ||
248 | __ATTR(out_intr_mask, S_IRUGO, vmbus_show_device_attr, NULL), | |
249 | __ATTR(out_read_index, S_IRUGO, vmbus_show_device_attr, NULL), | |
250 | __ATTR(out_write_index, S_IRUGO, vmbus_show_device_attr, NULL), | |
251 | __ATTR(out_read_bytes_avail, S_IRUGO, vmbus_show_device_attr, NULL), | |
252 | __ATTR(out_write_bytes_avail, S_IRUGO, vmbus_show_device_attr, NULL), | |
253 | ||
254 | __ATTR(in_intr_mask, S_IRUGO, vmbus_show_device_attr, NULL), | |
255 | __ATTR(in_read_index, S_IRUGO, vmbus_show_device_attr, NULL), | |
256 | __ATTR(in_write_index, S_IRUGO, vmbus_show_device_attr, NULL), | |
257 | __ATTR(in_read_bytes_avail, S_IRUGO, vmbus_show_device_attr, NULL), | |
258 | __ATTR(in_write_bytes_avail, S_IRUGO, vmbus_show_device_attr, NULL), | |
259 | __ATTR_NULL | |
260 | }; | |
3e7ee490 | 261 | |
793be9c7 | 262 | |
adde2487 S |
263 | /* |
264 | * vmbus_uevent - add uevent for our device | |
265 | * | |
266 | * This routine is invoked when a device is added or removed on the vmbus to | |
267 | * generate a uevent to udev in the userspace. The udev will then look at its | |
268 | * rule and the uevent generated here to load the appropriate driver | |
0ddda660 S |
269 | * |
270 | * The alias string will be of the form vmbus:guid where guid is the string | |
271 | * representation of the device guid (each byte of the guid will be | |
272 | * represented with two hex characters. | |
adde2487 S |
273 | */ |
274 | static int vmbus_uevent(struct device *device, struct kobj_uevent_env *env) | |
275 | { | |
276 | struct hv_device *dev = device_to_hv_device(device); | |
fd776ba9 OH |
277 | int ret; |
278 | char alias_name[VMBUS_ALIAS_LEN + 1]; | |
0ddda660 | 279 | |
fd776ba9 | 280 | print_alias_name(dev, alias_name); |
0ddda660 S |
281 | ret = add_uevent_var(env, "MODALIAS=vmbus:%s", alias_name); |
282 | return ret; | |
adde2487 S |
283 | } |
284 | ||
5841a829 S |
285 | static uuid_le null_guid; |
286 | ||
287 | static inline bool is_null_guid(const __u8 *guid) | |
288 | { | |
289 | if (memcmp(guid, &null_guid, sizeof(uuid_le))) | |
290 | return false; | |
291 | return true; | |
292 | } | |
293 | ||
3037a7b6 S |
294 | /* |
295 | * Return a matching hv_vmbus_device_id pointer. | |
296 | * If there is no match, return NULL. | |
297 | */ | |
298 | static const struct hv_vmbus_device_id *hv_vmbus_get_id( | |
299 | const struct hv_vmbus_device_id *id, | |
300 | __u8 *guid) | |
301 | { | |
302 | for (; !is_null_guid(id->guid); id++) | |
303 | if (!memcmp(&id->guid, guid, sizeof(uuid_le))) | |
304 | return id; | |
305 | ||
306 | return NULL; | |
307 | } | |
308 | ||
309 | ||
b7fc147b S |
310 | |
311 | /* | |
312 | * vmbus_match - Attempt to match the specified device to the specified driver | |
313 | */ | |
314 | static int vmbus_match(struct device *device, struct device_driver *driver) | |
315 | { | |
b7fc147b | 316 | struct hv_driver *drv = drv_to_hv_drv(driver); |
e8e27047 | 317 | struct hv_device *hv_dev = device_to_hv_device(device); |
b7fc147b | 318 | |
3037a7b6 S |
319 | if (hv_vmbus_get_id(drv->id_table, hv_dev->dev_type.b)) |
320 | return 1; | |
de632a2b | 321 | |
5841a829 | 322 | return 0; |
b7fc147b S |
323 | } |
324 | ||
f1f0d67b S |
325 | /* |
326 | * vmbus_probe - Add the new vmbus's child device | |
327 | */ | |
328 | static int vmbus_probe(struct device *child_device) | |
329 | { | |
330 | int ret = 0; | |
331 | struct hv_driver *drv = | |
332 | drv_to_hv_drv(child_device->driver); | |
9efd21e1 | 333 | struct hv_device *dev = device_to_hv_device(child_device); |
84946899 | 334 | const struct hv_vmbus_device_id *dev_id; |
f1f0d67b | 335 | |
84946899 | 336 | dev_id = hv_vmbus_get_id(drv->id_table, dev->dev_type.b); |
9efd21e1 | 337 | if (drv->probe) { |
84946899 | 338 | ret = drv->probe(dev, dev_id); |
b14a7b30 | 339 | if (ret != 0) |
0a46618d HJ |
340 | pr_err("probe failed for device %s (%d)\n", |
341 | dev_name(child_device), ret); | |
f1f0d67b | 342 | |
f1f0d67b | 343 | } else { |
0a46618d HJ |
344 | pr_err("probe not set for driver %s\n", |
345 | dev_name(child_device)); | |
6de925b1 | 346 | ret = -ENODEV; |
f1f0d67b S |
347 | } |
348 | return ret; | |
349 | } | |
350 | ||
c5dce3db S |
351 | /* |
352 | * vmbus_remove - Remove a vmbus device | |
353 | */ | |
354 | static int vmbus_remove(struct device *child_device) | |
355 | { | |
d4372179 | 356 | struct hv_driver *drv = drv_to_hv_drv(child_device->driver); |
415b023a | 357 | struct hv_device *dev = device_to_hv_device(child_device); |
c5dce3db | 358 | |
d4372179 S |
359 | if (drv->remove) |
360 | drv->remove(dev); | |
361 | else | |
362 | pr_err("remove not set for driver %s\n", | |
363 | dev_name(child_device)); | |
c5dce3db S |
364 | |
365 | return 0; | |
366 | } | |
367 | ||
eb1bb259 S |
368 | |
369 | /* | |
370 | * vmbus_shutdown - Shutdown a vmbus device | |
371 | */ | |
372 | static void vmbus_shutdown(struct device *child_device) | |
373 | { | |
374 | struct hv_driver *drv; | |
ca6887fb | 375 | struct hv_device *dev = device_to_hv_device(child_device); |
eb1bb259 S |
376 | |
377 | ||
378 | /* The device may not be attached yet */ | |
379 | if (!child_device->driver) | |
380 | return; | |
381 | ||
382 | drv = drv_to_hv_drv(child_device->driver); | |
383 | ||
ca6887fb S |
384 | if (drv->shutdown) |
385 | drv->shutdown(dev); | |
eb1bb259 S |
386 | |
387 | return; | |
388 | } | |
389 | ||
086e7a56 S |
390 | |
391 | /* | |
392 | * vmbus_device_release - Final callback release of the vmbus child device | |
393 | */ | |
394 | static void vmbus_device_release(struct device *device) | |
395 | { | |
e8e27047 | 396 | struct hv_device *hv_dev = device_to_hv_device(device); |
086e7a56 | 397 | |
e8e27047 | 398 | kfree(hv_dev); |
086e7a56 S |
399 | |
400 | } | |
401 | ||
454f18a9 | 402 | /* The one and only one */ |
9adcac5c S |
403 | static struct bus_type hv_bus = { |
404 | .name = "vmbus", | |
405 | .match = vmbus_match, | |
406 | .shutdown = vmbus_shutdown, | |
407 | .remove = vmbus_remove, | |
408 | .probe = vmbus_probe, | |
409 | .uevent = vmbus_uevent, | |
410 | .dev_attrs = vmbus_device_attrs, | |
3e7ee490 HJ |
411 | }; |
412 | ||
adf874cb | 413 | static const char *driver_name = "hyperv"; |
36199a99 | 414 | |
36199a99 | 415 | |
bf6506f6 TT |
416 | struct onmessage_work_context { |
417 | struct work_struct work; | |
418 | struct hv_message msg; | |
419 | }; | |
420 | ||
421 | static void vmbus_onmessage_work(struct work_struct *work) | |
422 | { | |
423 | struct onmessage_work_context *ctx; | |
424 | ||
425 | ctx = container_of(work, struct onmessage_work_context, | |
426 | work); | |
427 | vmbus_onmessage(&ctx->msg); | |
428 | kfree(ctx); | |
429 | } | |
430 | ||
62c1059d | 431 | static void vmbus_on_msg_dpc(unsigned long data) |
36199a99 GKH |
432 | { |
433 | int cpu = smp_processor_id(); | |
434 | void *page_addr = hv_context.synic_message_page[cpu]; | |
435 | struct hv_message *msg = (struct hv_message *)page_addr + | |
436 | VMBUS_MESSAGE_SINT; | |
bf6506f6 | 437 | struct onmessage_work_context *ctx; |
36199a99 GKH |
438 | |
439 | while (1) { | |
440 | if (msg->header.message_type == HVMSG_NONE) { | |
441 | /* no msg */ | |
442 | break; | |
443 | } else { | |
bf6506f6 TT |
444 | ctx = kmalloc(sizeof(*ctx), GFP_ATOMIC); |
445 | if (ctx == NULL) | |
36199a99 | 446 | continue; |
bf6506f6 TT |
447 | INIT_WORK(&ctx->work, vmbus_onmessage_work); |
448 | memcpy(&ctx->msg, msg, sizeof(*msg)); | |
da9fcb72 | 449 | queue_work(vmbus_connection.work_queue, &ctx->work); |
36199a99 GKH |
450 | } |
451 | ||
452 | msg->header.message_type = HVMSG_NONE; | |
453 | ||
454 | /* | |
455 | * Make sure the write to MessageType (ie set to | |
456 | * HVMSG_NONE) happens before we read the | |
457 | * MessagePending and EOMing. Otherwise, the EOMing | |
458 | * will not deliver any more messages since there is | |
459 | * no empty slot | |
460 | */ | |
e826f1d5 | 461 | smp_mb(); |
36199a99 GKH |
462 | |
463 | if (msg->header.message_flags.msg_pending) { | |
464 | /* | |
465 | * This will cause message queue rescan to | |
466 | * possibly deliver another msg from the | |
467 | * hypervisor | |
468 | */ | |
469 | wrmsrl(HV_X64_MSR_EOM, 0); | |
470 | } | |
471 | } | |
472 | } | |
473 | ||
ae4636e6 | 474 | static irqreturn_t vmbus_isr(int irq, void *dev_id) |
36199a99 | 475 | { |
36199a99 GKH |
476 | int cpu = smp_processor_id(); |
477 | void *page_addr; | |
478 | struct hv_message *msg; | |
479 | union hv_synic_event_flags *event; | |
ae4636e6 | 480 | bool handled = false; |
36199a99 | 481 | |
7341d908 S |
482 | /* |
483 | * Check for events before checking for messages. This is the order | |
484 | * in which events and messages are checked in Windows guests on | |
485 | * Hyper-V, and the Windows team suggested we do the same. | |
486 | */ | |
36199a99 | 487 | |
36199a99 GKH |
488 | page_addr = hv_context.synic_event_page[cpu]; |
489 | event = (union hv_synic_event_flags *)page_addr + VMBUS_MESSAGE_SINT; | |
490 | ||
491 | /* Since we are a child, we only need to check bit 0 */ | |
ae4636e6 S |
492 | if (sync_test_and_clear_bit(0, (unsigned long *) &event->flags32[0])) { |
493 | handled = true; | |
494 | tasklet_schedule(&event_dpc); | |
495 | } | |
793be9c7 | 496 | |
7341d908 S |
497 | page_addr = hv_context.synic_message_page[cpu]; |
498 | msg = (struct hv_message *)page_addr + VMBUS_MESSAGE_SINT; | |
499 | ||
500 | /* Check if there are actual msgs to be processed */ | |
501 | if (msg->header.message_type != HVMSG_NONE) { | |
502 | handled = true; | |
503 | tasklet_schedule(&msg_dpc); | |
504 | } | |
505 | ||
ae4636e6 | 506 | if (handled) |
793be9c7 | 507 | return IRQ_HANDLED; |
ae4636e6 | 508 | else |
793be9c7 | 509 | return IRQ_NONE; |
793be9c7 S |
510 | } |
511 | ||
3e189519 | 512 | /* |
90c9960e GKH |
513 | * vmbus_bus_init -Main vmbus driver initialization routine. |
514 | * | |
515 | * Here, we | |
0686e4f4 | 516 | * - initialize the vmbus driver context |
0686e4f4 LL |
517 | * - invoke the vmbus hv main init routine |
518 | * - get the irq resource | |
0686e4f4 | 519 | * - retrieve the channel offers |
90c9960e | 520 | */ |
9aaa995e | 521 | static int vmbus_bus_init(int irq) |
3e7ee490 | 522 | { |
90c9960e GKH |
523 | int ret; |
524 | unsigned int vector; | |
3e7ee490 | 525 | |
6d26e38f GKH |
526 | /* Hypervisor initialization...setup hypercall page..etc */ |
527 | ret = hv_init(); | |
90c9960e | 528 | if (ret != 0) { |
0a46618d | 529 | pr_err("Unable to initialize the hypervisor - 0x%x\n", ret); |
d6c1c5de | 530 | return ret; |
3e7ee490 HJ |
531 | } |
532 | ||
59c0e4f0 | 533 | tasklet_init(&msg_dpc, vmbus_on_msg_dpc, 0); |
66d9229c | 534 | tasklet_init(&event_dpc, vmbus_on_event, 0); |
3e7ee490 | 535 | |
9adcac5c | 536 | ret = bus_register(&hv_bus); |
d6c1c5de | 537 | if (ret) |
8b9987e9 | 538 | goto err_cleanup; |
3e7ee490 | 539 | |
3d2de267 | 540 | ret = request_irq(irq, vmbus_isr, IRQF_SAMPLE_RANDOM, |
607c1a11 | 541 | driver_name, hv_acpi_dev); |
3e7ee490 | 542 | |
90c9960e | 543 | if (ret != 0) { |
0a46618d | 544 | pr_err("Unable to request IRQ %d\n", |
9aaa995e | 545 | irq); |
8b9987e9 | 546 | goto err_unregister; |
3e7ee490 | 547 | } |
3e7ee490 | 548 | |
9aaa995e | 549 | vector = IRQ0_VECTOR + irq; |
3e7ee490 | 550 | |
800b6902 S |
551 | /* |
552 | * Notify the hypervisor of our irq and | |
553 | * connect to the host. | |
554 | */ | |
555 | on_each_cpu(hv_synic_init, (void *)&vector, 1); | |
556 | ret = vmbus_connect(); | |
8b9987e9 S |
557 | if (ret) |
558 | goto err_irq; | |
800b6902 | 559 | |
2d6e882b | 560 | vmbus_request_offers(); |
8b5d6d3b | 561 | |
d6c1c5de | 562 | return 0; |
8b9987e9 S |
563 | |
564 | err_irq: | |
565 | free_irq(irq, hv_acpi_dev); | |
566 | ||
567 | err_unregister: | |
568 | bus_unregister(&hv_bus); | |
569 | ||
570 | err_cleanup: | |
571 | hv_cleanup(); | |
572 | ||
573 | return ret; | |
3e7ee490 HJ |
574 | } |
575 | ||
90c9960e | 576 | /** |
768fa219 GKH |
577 | * __vmbus_child_driver_register - Register a vmbus's driver |
578 | * @drv: Pointer to driver structure you want to register | |
579 | * @owner: owner module of the drv | |
580 | * @mod_name: module name string | |
3e189519 HJ |
581 | * |
582 | * Registers the given driver with Linux through the 'driver_register()' call | |
768fa219 | 583 | * and sets up the hyper-v vmbus handling for this driver. |
3e189519 HJ |
584 | * It will return the state of the 'driver_register()' call. |
585 | * | |
90c9960e | 586 | */ |
768fa219 | 587 | int __vmbus_driver_register(struct hv_driver *hv_driver, struct module *owner, const char *mod_name) |
3e7ee490 | 588 | { |
5d48a1c2 | 589 | int ret; |
3e7ee490 | 590 | |
768fa219 | 591 | pr_info("registering driver %s\n", hv_driver->name); |
3e7ee490 | 592 | |
768fa219 GKH |
593 | hv_driver->driver.name = hv_driver->name; |
594 | hv_driver->driver.owner = owner; | |
595 | hv_driver->driver.mod_name = mod_name; | |
596 | hv_driver->driver.bus = &hv_bus; | |
3e7ee490 | 597 | |
768fa219 | 598 | ret = driver_register(&hv_driver->driver); |
3e7ee490 | 599 | |
2d6e882b | 600 | vmbus_request_offers(); |
3e7ee490 | 601 | |
5d48a1c2 | 602 | return ret; |
3e7ee490 | 603 | } |
768fa219 | 604 | EXPORT_SYMBOL_GPL(__vmbus_driver_register); |
3e7ee490 | 605 | |
90c9960e | 606 | /** |
768fa219 GKH |
607 | * vmbus_driver_unregister() - Unregister a vmbus's driver |
608 | * @drv: Pointer to driver structure you want to un-register | |
3e189519 | 609 | * |
768fa219 GKH |
610 | * Un-register the given driver that was previous registered with a call to |
611 | * vmbus_driver_register() | |
90c9960e | 612 | */ |
768fa219 | 613 | void vmbus_driver_unregister(struct hv_driver *hv_driver) |
3e7ee490 | 614 | { |
768fa219 | 615 | pr_info("unregistering driver %s\n", hv_driver->name); |
3e7ee490 | 616 | |
768fa219 | 617 | driver_unregister(&hv_driver->driver); |
3e7ee490 | 618 | |
3e7ee490 | 619 | } |
768fa219 | 620 | EXPORT_SYMBOL_GPL(vmbus_driver_unregister); |
3e7ee490 | 621 | |
3e189519 | 622 | /* |
f2c73011 | 623 | * vmbus_device_create - Creates and registers a new child device |
3e189519 | 624 | * on the vmbus. |
90c9960e | 625 | */ |
f2c73011 | 626 | struct hv_device *vmbus_device_create(uuid_le *type, |
358d2ee2 | 627 | uuid_le *instance, |
89733aa9 | 628 | struct vmbus_channel *channel) |
3e7ee490 | 629 | { |
3d3b5518 | 630 | struct hv_device *child_device_obj; |
3e7ee490 | 631 | |
6bad88da S |
632 | child_device_obj = kzalloc(sizeof(struct hv_device), GFP_KERNEL); |
633 | if (!child_device_obj) { | |
0a46618d | 634 | pr_err("Unable to allocate device object for child device\n"); |
3e7ee490 HJ |
635 | return NULL; |
636 | } | |
637 | ||
cae5b843 | 638 | child_device_obj->channel = channel; |
358d2ee2 | 639 | memcpy(&child_device_obj->dev_type, type, sizeof(uuid_le)); |
ca623ad3 | 640 | memcpy(&child_device_obj->dev_instance, instance, |
358d2ee2 | 641 | sizeof(uuid_le)); |
3e7ee490 | 642 | |
3e7ee490 | 643 | |
3e7ee490 HJ |
644 | return child_device_obj; |
645 | } | |
646 | ||
3e189519 | 647 | /* |
22794281 | 648 | * vmbus_device_register - Register the child device |
90c9960e | 649 | */ |
22794281 | 650 | int vmbus_device_register(struct hv_device *child_device_obj) |
3e7ee490 | 651 | { |
90c9960e | 652 | int ret = 0; |
6bad88da | 653 | |
f4888417 | 654 | static atomic_t device_num = ATOMIC_INIT(0); |
3e7ee490 | 655 | |
6bad88da | 656 | dev_set_name(&child_device_obj->device, "vmbus_0_%d", |
90c9960e | 657 | atomic_inc_return(&device_num)); |
3e7ee490 | 658 | |
0bce28b6 | 659 | child_device_obj->device.bus = &hv_bus; |
607c1a11 | 660 | child_device_obj->device.parent = &hv_acpi_dev->dev; |
6bad88da | 661 | child_device_obj->device.release = vmbus_device_release; |
3e7ee490 | 662 | |
90c9960e GKH |
663 | /* |
664 | * Register with the LDM. This will kick off the driver/device | |
665 | * binding...which will eventually call vmbus_match() and vmbus_probe() | |
666 | */ | |
6bad88da | 667 | ret = device_register(&child_device_obj->device); |
3e7ee490 | 668 | |
3e7ee490 | 669 | if (ret) |
0a46618d | 670 | pr_err("Unable to register child device\n"); |
3e7ee490 | 671 | else |
0a46618d HJ |
672 | pr_info("child device %s registered\n", |
673 | dev_name(&child_device_obj->device)); | |
3e7ee490 | 674 | |
3e7ee490 HJ |
675 | return ret; |
676 | } | |
677 | ||
3e189519 | 678 | /* |
696453ba | 679 | * vmbus_device_unregister - Remove the specified child device |
3e189519 | 680 | * from the vmbus. |
90c9960e | 681 | */ |
696453ba | 682 | void vmbus_device_unregister(struct hv_device *device_obj) |
3e7ee490 | 683 | { |
90c9960e GKH |
684 | /* |
685 | * Kick off the process of unregistering the device. | |
686 | * This will call vmbus_remove() and eventually vmbus_device_release() | |
687 | */ | |
6bad88da | 688 | device_unregister(&device_obj->device); |
3e7ee490 | 689 | |
0a46618d HJ |
690 | pr_info("child device %s unregistered\n", |
691 | dev_name(&device_obj->device)); | |
3e7ee490 HJ |
692 | } |
693 | ||
3e7ee490 | 694 | |
b0069f43 S |
695 | /* |
696 | * VMBUS is an acpi enumerated device. Get the the IRQ information | |
697 | * from DSDT. | |
698 | */ | |
699 | ||
700 | static acpi_status vmbus_walk_resources(struct acpi_resource *res, void *irq) | |
701 | { | |
702 | ||
703 | if (res->type == ACPI_RESOURCE_TYPE_IRQ) { | |
704 | struct acpi_resource_irq *irqp; | |
705 | irqp = &res->data.irq; | |
706 | ||
707 | *((unsigned int *)irq) = irqp->interrupts[0]; | |
708 | } | |
709 | ||
710 | return AE_OK; | |
711 | } | |
712 | ||
713 | static int vmbus_acpi_add(struct acpi_device *device) | |
714 | { | |
715 | acpi_status result; | |
716 | ||
607c1a11 S |
717 | hv_acpi_dev = device; |
718 | ||
0a4425b6 S |
719 | result = acpi_walk_resources(device->handle, METHOD_NAME__CRS, |
720 | vmbus_walk_resources, &irq); | |
b0069f43 S |
721 | |
722 | if (ACPI_FAILURE(result)) { | |
723 | complete(&probe_event); | |
724 | return -ENODEV; | |
725 | } | |
726 | complete(&probe_event); | |
727 | return 0; | |
728 | } | |
729 | ||
730 | static const struct acpi_device_id vmbus_acpi_device_ids[] = { | |
731 | {"VMBUS", 0}, | |
9d7b18d1 | 732 | {"VMBus", 0}, |
b0069f43 S |
733 | {"", 0}, |
734 | }; | |
735 | MODULE_DEVICE_TABLE(acpi, vmbus_acpi_device_ids); | |
736 | ||
737 | static struct acpi_driver vmbus_acpi_driver = { | |
738 | .name = "vmbus", | |
739 | .ids = vmbus_acpi_device_ids, | |
740 | .ops = { | |
741 | .add = vmbus_acpi_add, | |
742 | }, | |
743 | }; | |
744 | ||
607c1a11 | 745 | static int __init hv_acpi_init(void) |
1168ac22 | 746 | { |
2dda95f8 | 747 | int ret, t; |
b0069f43 S |
748 | |
749 | init_completion(&probe_event); | |
750 | ||
751 | /* | |
752 | * Get irq resources first. | |
753 | */ | |
754 | ||
0246604c S |
755 | ret = acpi_bus_register_driver(&vmbus_acpi_driver); |
756 | ||
b0069f43 S |
757 | if (ret) |
758 | return ret; | |
759 | ||
2dda95f8 S |
760 | t = wait_for_completion_timeout(&probe_event, 5*HZ); |
761 | if (t == 0) { | |
762 | ret = -ETIMEDOUT; | |
763 | goto cleanup; | |
764 | } | |
b0069f43 S |
765 | |
766 | if (irq <= 0) { | |
2dda95f8 S |
767 | ret = -ENODEV; |
768 | goto cleanup; | |
b0069f43 S |
769 | } |
770 | ||
91fd799e S |
771 | ret = vmbus_bus_init(irq); |
772 | if (ret) | |
2dda95f8 S |
773 | goto cleanup; |
774 | ||
775 | return 0; | |
776 | ||
777 | cleanup: | |
778 | acpi_bus_unregister_driver(&vmbus_acpi_driver); | |
91fd799e | 779 | return ret; |
1168ac22 S |
780 | } |
781 | ||
1168ac22 | 782 | |
90c9960e | 783 | MODULE_LICENSE("GPL"); |
26c14cc1 | 784 | MODULE_VERSION(HV_DRV_VERSION); |
3e7ee490 | 785 | |
607c1a11 | 786 | module_init(hv_acpi_init); |