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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 | ||
cf6a2eac S |
65 | static int vmbus_exists(void) |
66 | { | |
67 | if (hv_acpi_dev == NULL) | |
68 | return -ENODEV; | |
69 | ||
70 | return 0; | |
71 | } | |
72 | ||
15b80d64 | 73 | |
98db4335 S |
74 | static void get_channel_info(struct hv_device *device, |
75 | struct hv_device_info *info) | |
76 | { | |
77 | struct vmbus_channel_debug_info debug_info; | |
78 | ||
79 | if (!device->channel) | |
80 | return; | |
81 | ||
82 | vmbus_get_debug_info(device->channel, &debug_info); | |
83 | ||
84 | info->chn_id = debug_info.relid; | |
85 | info->chn_state = debug_info.state; | |
86 | memcpy(&info->chn_type, &debug_info.interfacetype, | |
358d2ee2 | 87 | sizeof(uuid_le)); |
98db4335 | 88 | memcpy(&info->chn_instance, &debug_info.interface_instance, |
358d2ee2 | 89 | sizeof(uuid_le)); |
98db4335 S |
90 | |
91 | info->monitor_id = debug_info.monitorid; | |
92 | ||
93 | info->server_monitor_pending = debug_info.servermonitor_pending; | |
94 | info->server_monitor_latency = debug_info.servermonitor_latency; | |
95 | info->server_monitor_conn_id = debug_info.servermonitor_connectionid; | |
96 | ||
97 | info->client_monitor_pending = debug_info.clientmonitor_pending; | |
98 | info->client_monitor_latency = debug_info.clientmonitor_latency; | |
99 | info->client_monitor_conn_id = debug_info.clientmonitor_connectionid; | |
100 | ||
101 | info->inbound.int_mask = debug_info.inbound.current_interrupt_mask; | |
102 | info->inbound.read_idx = debug_info.inbound.current_read_index; | |
103 | info->inbound.write_idx = debug_info.inbound.current_write_index; | |
104 | info->inbound.bytes_avail_toread = | |
105 | debug_info.inbound.bytes_avail_toread; | |
106 | info->inbound.bytes_avail_towrite = | |
107 | debug_info.inbound.bytes_avail_towrite; | |
3e7ee490 | 108 | |
98db4335 S |
109 | info->outbound.int_mask = |
110 | debug_info.outbound.current_interrupt_mask; | |
111 | info->outbound.read_idx = debug_info.outbound.current_read_index; | |
112 | info->outbound.write_idx = debug_info.outbound.current_write_index; | |
113 | info->outbound.bytes_avail_toread = | |
114 | debug_info.outbound.bytes_avail_toread; | |
115 | info->outbound.bytes_avail_towrite = | |
116 | debug_info.outbound.bytes_avail_towrite; | |
117 | } | |
3e7ee490 | 118 | |
fd776ba9 OH |
119 | #define VMBUS_ALIAS_LEN ((sizeof((struct hv_vmbus_device_id *)0)->guid) * 2) |
120 | static void print_alias_name(struct hv_device *hv_dev, char *alias_name) | |
121 | { | |
122 | int i; | |
123 | for (i = 0; i < VMBUS_ALIAS_LEN; i += 2) | |
124 | sprintf(&alias_name[i], "%02x", hv_dev->dev_type.b[i/2]); | |
125 | } | |
126 | ||
98db4335 S |
127 | /* |
128 | * vmbus_show_device_attr - Show the device attribute in sysfs. | |
129 | * | |
130 | * This is invoked when user does a | |
131 | * "cat /sys/bus/vmbus/devices/<busdevice>/<attr name>" | |
132 | */ | |
90c9960e GKH |
133 | static ssize_t vmbus_show_device_attr(struct device *dev, |
134 | struct device_attribute *dev_attr, | |
98db4335 S |
135 | char *buf) |
136 | { | |
e8e27047 | 137 | struct hv_device *hv_dev = device_to_hv_device(dev); |
7bb52384 | 138 | struct hv_device_info *device_info; |
fd776ba9 | 139 | char alias_name[VMBUS_ALIAS_LEN + 1]; |
7bb52384 | 140 | int ret = 0; |
3e7ee490 | 141 | |
7bb52384 S |
142 | device_info = kzalloc(sizeof(struct hv_device_info), GFP_KERNEL); |
143 | if (!device_info) | |
144 | return ret; | |
3e7ee490 | 145 | |
7bb52384 | 146 | get_channel_info(hv_dev, device_info); |
3e7ee490 | 147 | |
98db4335 | 148 | if (!strcmp(dev_attr->attr.name, "class_id")) { |
2221f6ef | 149 | ret = sprintf(buf, "{%pUl}\n", device_info->chn_type.b); |
98db4335 | 150 | } else if (!strcmp(dev_attr->attr.name, "device_id")) { |
2221f6ef | 151 | ret = sprintf(buf, "{%pUl}\n", device_info->chn_instance.b); |
fd776ba9 OH |
152 | } else if (!strcmp(dev_attr->attr.name, "modalias")) { |
153 | print_alias_name(hv_dev, alias_name); | |
7bb52384 | 154 | ret = sprintf(buf, "vmbus:%s\n", alias_name); |
98db4335 | 155 | } else if (!strcmp(dev_attr->attr.name, "state")) { |
7bb52384 | 156 | ret = sprintf(buf, "%d\n", device_info->chn_state); |
98db4335 | 157 | } else if (!strcmp(dev_attr->attr.name, "id")) { |
7bb52384 | 158 | ret = sprintf(buf, "%d\n", device_info->chn_id); |
98db4335 | 159 | } else if (!strcmp(dev_attr->attr.name, "out_intr_mask")) { |
7bb52384 | 160 | ret = sprintf(buf, "%d\n", device_info->outbound.int_mask); |
98db4335 | 161 | } else if (!strcmp(dev_attr->attr.name, "out_read_index")) { |
7bb52384 | 162 | ret = sprintf(buf, "%d\n", device_info->outbound.read_idx); |
98db4335 | 163 | } else if (!strcmp(dev_attr->attr.name, "out_write_index")) { |
7bb52384 | 164 | ret = sprintf(buf, "%d\n", device_info->outbound.write_idx); |
98db4335 | 165 | } else if (!strcmp(dev_attr->attr.name, "out_read_bytes_avail")) { |
7bb52384 S |
166 | ret = sprintf(buf, "%d\n", |
167 | device_info->outbound.bytes_avail_toread); | |
98db4335 | 168 | } else if (!strcmp(dev_attr->attr.name, "out_write_bytes_avail")) { |
7bb52384 S |
169 | ret = sprintf(buf, "%d\n", |
170 | device_info->outbound.bytes_avail_towrite); | |
98db4335 | 171 | } else if (!strcmp(dev_attr->attr.name, "in_intr_mask")) { |
7bb52384 | 172 | ret = sprintf(buf, "%d\n", device_info->inbound.int_mask); |
98db4335 | 173 | } else if (!strcmp(dev_attr->attr.name, "in_read_index")) { |
7bb52384 | 174 | ret = sprintf(buf, "%d\n", device_info->inbound.read_idx); |
98db4335 | 175 | } else if (!strcmp(dev_attr->attr.name, "in_write_index")) { |
7bb52384 | 176 | ret = sprintf(buf, "%d\n", device_info->inbound.write_idx); |
98db4335 | 177 | } else if (!strcmp(dev_attr->attr.name, "in_read_bytes_avail")) { |
7bb52384 S |
178 | ret = sprintf(buf, "%d\n", |
179 | device_info->inbound.bytes_avail_toread); | |
98db4335 | 180 | } else if (!strcmp(dev_attr->attr.name, "in_write_bytes_avail")) { |
7bb52384 S |
181 | ret = sprintf(buf, "%d\n", |
182 | device_info->inbound.bytes_avail_towrite); | |
98db4335 | 183 | } else if (!strcmp(dev_attr->attr.name, "monitor_id")) { |
7bb52384 | 184 | ret = sprintf(buf, "%d\n", device_info->monitor_id); |
98db4335 | 185 | } else if (!strcmp(dev_attr->attr.name, "server_monitor_pending")) { |
7bb52384 | 186 | ret = sprintf(buf, "%d\n", device_info->server_monitor_pending); |
98db4335 | 187 | } else if (!strcmp(dev_attr->attr.name, "server_monitor_latency")) { |
7bb52384 | 188 | ret = sprintf(buf, "%d\n", device_info->server_monitor_latency); |
98db4335 | 189 | } else if (!strcmp(dev_attr->attr.name, "server_monitor_conn_id")) { |
7bb52384 S |
190 | ret = sprintf(buf, "%d\n", |
191 | device_info->server_monitor_conn_id); | |
98db4335 | 192 | } else if (!strcmp(dev_attr->attr.name, "client_monitor_pending")) { |
7bb52384 | 193 | ret = sprintf(buf, "%d\n", device_info->client_monitor_pending); |
98db4335 | 194 | } else if (!strcmp(dev_attr->attr.name, "client_monitor_latency")) { |
7bb52384 | 195 | ret = sprintf(buf, "%d\n", device_info->client_monitor_latency); |
98db4335 | 196 | } else if (!strcmp(dev_attr->attr.name, "client_monitor_conn_id")) { |
7bb52384 S |
197 | ret = sprintf(buf, "%d\n", |
198 | device_info->client_monitor_conn_id); | |
98db4335 | 199 | } |
7bb52384 S |
200 | |
201 | kfree(device_info); | |
202 | return ret; | |
98db4335 | 203 | } |
3e7ee490 | 204 | |
454f18a9 | 205 | /* Set up per device attributes in /sys/bus/vmbus/devices/<bus device> */ |
3e7ee490 HJ |
206 | static struct device_attribute vmbus_device_attrs[] = { |
207 | __ATTR(id, S_IRUGO, vmbus_show_device_attr, NULL), | |
208 | __ATTR(state, S_IRUGO, vmbus_show_device_attr, NULL), | |
209 | __ATTR(class_id, S_IRUGO, vmbus_show_device_attr, NULL), | |
210 | __ATTR(device_id, S_IRUGO, vmbus_show_device_attr, NULL), | |
211 | __ATTR(monitor_id, S_IRUGO, vmbus_show_device_attr, NULL), | |
fd776ba9 | 212 | __ATTR(modalias, S_IRUGO, vmbus_show_device_attr, NULL), |
3e7ee490 HJ |
213 | |
214 | __ATTR(server_monitor_pending, S_IRUGO, vmbus_show_device_attr, NULL), | |
215 | __ATTR(server_monitor_latency, S_IRUGO, vmbus_show_device_attr, NULL), | |
216 | __ATTR(server_monitor_conn_id, S_IRUGO, vmbus_show_device_attr, NULL), | |
217 | ||
218 | __ATTR(client_monitor_pending, S_IRUGO, vmbus_show_device_attr, NULL), | |
219 | __ATTR(client_monitor_latency, S_IRUGO, vmbus_show_device_attr, NULL), | |
220 | __ATTR(client_monitor_conn_id, S_IRUGO, vmbus_show_device_attr, NULL), | |
221 | ||
222 | __ATTR(out_intr_mask, S_IRUGO, vmbus_show_device_attr, NULL), | |
223 | __ATTR(out_read_index, S_IRUGO, vmbus_show_device_attr, NULL), | |
224 | __ATTR(out_write_index, S_IRUGO, vmbus_show_device_attr, NULL), | |
225 | __ATTR(out_read_bytes_avail, S_IRUGO, vmbus_show_device_attr, NULL), | |
226 | __ATTR(out_write_bytes_avail, S_IRUGO, vmbus_show_device_attr, NULL), | |
227 | ||
228 | __ATTR(in_intr_mask, S_IRUGO, vmbus_show_device_attr, NULL), | |
229 | __ATTR(in_read_index, S_IRUGO, vmbus_show_device_attr, NULL), | |
230 | __ATTR(in_write_index, S_IRUGO, vmbus_show_device_attr, NULL), | |
231 | __ATTR(in_read_bytes_avail, S_IRUGO, vmbus_show_device_attr, NULL), | |
232 | __ATTR(in_write_bytes_avail, S_IRUGO, vmbus_show_device_attr, NULL), | |
233 | __ATTR_NULL | |
234 | }; | |
3e7ee490 | 235 | |
793be9c7 | 236 | |
adde2487 S |
237 | /* |
238 | * vmbus_uevent - add uevent for our device | |
239 | * | |
240 | * This routine is invoked when a device is added or removed on the vmbus to | |
241 | * generate a uevent to udev in the userspace. The udev will then look at its | |
242 | * rule and the uevent generated here to load the appropriate driver | |
0ddda660 S |
243 | * |
244 | * The alias string will be of the form vmbus:guid where guid is the string | |
245 | * representation of the device guid (each byte of the guid will be | |
246 | * represented with two hex characters. | |
adde2487 S |
247 | */ |
248 | static int vmbus_uevent(struct device *device, struct kobj_uevent_env *env) | |
249 | { | |
250 | struct hv_device *dev = device_to_hv_device(device); | |
fd776ba9 OH |
251 | int ret; |
252 | char alias_name[VMBUS_ALIAS_LEN + 1]; | |
0ddda660 | 253 | |
fd776ba9 | 254 | print_alias_name(dev, alias_name); |
0ddda660 S |
255 | ret = add_uevent_var(env, "MODALIAS=vmbus:%s", alias_name); |
256 | return ret; | |
adde2487 S |
257 | } |
258 | ||
5841a829 S |
259 | static uuid_le null_guid; |
260 | ||
261 | static inline bool is_null_guid(const __u8 *guid) | |
262 | { | |
263 | if (memcmp(guid, &null_guid, sizeof(uuid_le))) | |
264 | return false; | |
265 | return true; | |
266 | } | |
267 | ||
3037a7b6 S |
268 | /* |
269 | * Return a matching hv_vmbus_device_id pointer. | |
270 | * If there is no match, return NULL. | |
271 | */ | |
272 | static const struct hv_vmbus_device_id *hv_vmbus_get_id( | |
273 | const struct hv_vmbus_device_id *id, | |
274 | __u8 *guid) | |
275 | { | |
276 | for (; !is_null_guid(id->guid); id++) | |
277 | if (!memcmp(&id->guid, guid, sizeof(uuid_le))) | |
278 | return id; | |
279 | ||
280 | return NULL; | |
281 | } | |
282 | ||
283 | ||
b7fc147b S |
284 | |
285 | /* | |
286 | * vmbus_match - Attempt to match the specified device to the specified driver | |
287 | */ | |
288 | static int vmbus_match(struct device *device, struct device_driver *driver) | |
289 | { | |
b7fc147b | 290 | struct hv_driver *drv = drv_to_hv_drv(driver); |
e8e27047 | 291 | struct hv_device *hv_dev = device_to_hv_device(device); |
b7fc147b | 292 | |
3037a7b6 S |
293 | if (hv_vmbus_get_id(drv->id_table, hv_dev->dev_type.b)) |
294 | return 1; | |
de632a2b | 295 | |
5841a829 | 296 | return 0; |
b7fc147b S |
297 | } |
298 | ||
f1f0d67b S |
299 | /* |
300 | * vmbus_probe - Add the new vmbus's child device | |
301 | */ | |
302 | static int vmbus_probe(struct device *child_device) | |
303 | { | |
304 | int ret = 0; | |
305 | struct hv_driver *drv = | |
306 | drv_to_hv_drv(child_device->driver); | |
9efd21e1 | 307 | struct hv_device *dev = device_to_hv_device(child_device); |
84946899 | 308 | const struct hv_vmbus_device_id *dev_id; |
f1f0d67b | 309 | |
84946899 | 310 | dev_id = hv_vmbus_get_id(drv->id_table, dev->dev_type.b); |
9efd21e1 | 311 | if (drv->probe) { |
84946899 | 312 | ret = drv->probe(dev, dev_id); |
b14a7b30 | 313 | if (ret != 0) |
0a46618d HJ |
314 | pr_err("probe failed for device %s (%d)\n", |
315 | dev_name(child_device), ret); | |
f1f0d67b | 316 | |
f1f0d67b | 317 | } else { |
0a46618d HJ |
318 | pr_err("probe not set for driver %s\n", |
319 | dev_name(child_device)); | |
6de925b1 | 320 | ret = -ENODEV; |
f1f0d67b S |
321 | } |
322 | return ret; | |
323 | } | |
324 | ||
c5dce3db S |
325 | /* |
326 | * vmbus_remove - Remove a vmbus device | |
327 | */ | |
328 | static int vmbus_remove(struct device *child_device) | |
329 | { | |
d4372179 | 330 | struct hv_driver *drv = drv_to_hv_drv(child_device->driver); |
415b023a | 331 | struct hv_device *dev = device_to_hv_device(child_device); |
c5dce3db | 332 | |
d4372179 S |
333 | if (drv->remove) |
334 | drv->remove(dev); | |
335 | else | |
336 | pr_err("remove not set for driver %s\n", | |
337 | dev_name(child_device)); | |
c5dce3db S |
338 | |
339 | return 0; | |
340 | } | |
341 | ||
eb1bb259 S |
342 | |
343 | /* | |
344 | * vmbus_shutdown - Shutdown a vmbus device | |
345 | */ | |
346 | static void vmbus_shutdown(struct device *child_device) | |
347 | { | |
348 | struct hv_driver *drv; | |
ca6887fb | 349 | struct hv_device *dev = device_to_hv_device(child_device); |
eb1bb259 S |
350 | |
351 | ||
352 | /* The device may not be attached yet */ | |
353 | if (!child_device->driver) | |
354 | return; | |
355 | ||
356 | drv = drv_to_hv_drv(child_device->driver); | |
357 | ||
ca6887fb S |
358 | if (drv->shutdown) |
359 | drv->shutdown(dev); | |
eb1bb259 S |
360 | |
361 | return; | |
362 | } | |
363 | ||
086e7a56 S |
364 | |
365 | /* | |
366 | * vmbus_device_release - Final callback release of the vmbus child device | |
367 | */ | |
368 | static void vmbus_device_release(struct device *device) | |
369 | { | |
e8e27047 | 370 | struct hv_device *hv_dev = device_to_hv_device(device); |
086e7a56 | 371 | |
e8e27047 | 372 | kfree(hv_dev); |
086e7a56 S |
373 | |
374 | } | |
375 | ||
454f18a9 | 376 | /* The one and only one */ |
9adcac5c S |
377 | static struct bus_type hv_bus = { |
378 | .name = "vmbus", | |
379 | .match = vmbus_match, | |
380 | .shutdown = vmbus_shutdown, | |
381 | .remove = vmbus_remove, | |
382 | .probe = vmbus_probe, | |
383 | .uevent = vmbus_uevent, | |
384 | .dev_attrs = vmbus_device_attrs, | |
3e7ee490 HJ |
385 | }; |
386 | ||
adf874cb | 387 | static const char *driver_name = "hyperv"; |
36199a99 | 388 | |
36199a99 | 389 | |
bf6506f6 TT |
390 | struct onmessage_work_context { |
391 | struct work_struct work; | |
392 | struct hv_message msg; | |
393 | }; | |
394 | ||
395 | static void vmbus_onmessage_work(struct work_struct *work) | |
396 | { | |
397 | struct onmessage_work_context *ctx; | |
398 | ||
399 | ctx = container_of(work, struct onmessage_work_context, | |
400 | work); | |
401 | vmbus_onmessage(&ctx->msg); | |
402 | kfree(ctx); | |
403 | } | |
404 | ||
62c1059d | 405 | static void vmbus_on_msg_dpc(unsigned long data) |
36199a99 GKH |
406 | { |
407 | int cpu = smp_processor_id(); | |
408 | void *page_addr = hv_context.synic_message_page[cpu]; | |
409 | struct hv_message *msg = (struct hv_message *)page_addr + | |
410 | VMBUS_MESSAGE_SINT; | |
bf6506f6 | 411 | struct onmessage_work_context *ctx; |
36199a99 GKH |
412 | |
413 | while (1) { | |
414 | if (msg->header.message_type == HVMSG_NONE) { | |
415 | /* no msg */ | |
416 | break; | |
417 | } else { | |
bf6506f6 TT |
418 | ctx = kmalloc(sizeof(*ctx), GFP_ATOMIC); |
419 | if (ctx == NULL) | |
36199a99 | 420 | continue; |
bf6506f6 TT |
421 | INIT_WORK(&ctx->work, vmbus_onmessage_work); |
422 | memcpy(&ctx->msg, msg, sizeof(*msg)); | |
da9fcb72 | 423 | queue_work(vmbus_connection.work_queue, &ctx->work); |
36199a99 GKH |
424 | } |
425 | ||
426 | msg->header.message_type = HVMSG_NONE; | |
427 | ||
428 | /* | |
429 | * Make sure the write to MessageType (ie set to | |
430 | * HVMSG_NONE) happens before we read the | |
431 | * MessagePending and EOMing. Otherwise, the EOMing | |
432 | * will not deliver any more messages since there is | |
433 | * no empty slot | |
434 | */ | |
e826f1d5 | 435 | smp_mb(); |
36199a99 GKH |
436 | |
437 | if (msg->header.message_flags.msg_pending) { | |
438 | /* | |
439 | * This will cause message queue rescan to | |
440 | * possibly deliver another msg from the | |
441 | * hypervisor | |
442 | */ | |
443 | wrmsrl(HV_X64_MSR_EOM, 0); | |
444 | } | |
445 | } | |
446 | } | |
447 | ||
ae4636e6 | 448 | static irqreturn_t vmbus_isr(int irq, void *dev_id) |
36199a99 | 449 | { |
36199a99 GKH |
450 | int cpu = smp_processor_id(); |
451 | void *page_addr; | |
452 | struct hv_message *msg; | |
453 | union hv_synic_event_flags *event; | |
ae4636e6 | 454 | bool handled = false; |
36199a99 | 455 | |
7341d908 S |
456 | /* |
457 | * Check for events before checking for messages. This is the order | |
458 | * in which events and messages are checked in Windows guests on | |
459 | * Hyper-V, and the Windows team suggested we do the same. | |
460 | */ | |
36199a99 | 461 | |
36199a99 GKH |
462 | page_addr = hv_context.synic_event_page[cpu]; |
463 | event = (union hv_synic_event_flags *)page_addr + VMBUS_MESSAGE_SINT; | |
464 | ||
465 | /* Since we are a child, we only need to check bit 0 */ | |
ae4636e6 S |
466 | if (sync_test_and_clear_bit(0, (unsigned long *) &event->flags32[0])) { |
467 | handled = true; | |
468 | tasklet_schedule(&event_dpc); | |
469 | } | |
793be9c7 | 470 | |
7341d908 S |
471 | page_addr = hv_context.synic_message_page[cpu]; |
472 | msg = (struct hv_message *)page_addr + VMBUS_MESSAGE_SINT; | |
473 | ||
474 | /* Check if there are actual msgs to be processed */ | |
475 | if (msg->header.message_type != HVMSG_NONE) { | |
476 | handled = true; | |
477 | tasklet_schedule(&msg_dpc); | |
478 | } | |
479 | ||
ae4636e6 | 480 | if (handled) |
793be9c7 | 481 | return IRQ_HANDLED; |
ae4636e6 | 482 | else |
793be9c7 | 483 | return IRQ_NONE; |
793be9c7 S |
484 | } |
485 | ||
3e189519 | 486 | /* |
90c9960e GKH |
487 | * vmbus_bus_init -Main vmbus driver initialization routine. |
488 | * | |
489 | * Here, we | |
0686e4f4 | 490 | * - initialize the vmbus driver context |
0686e4f4 LL |
491 | * - invoke the vmbus hv main init routine |
492 | * - get the irq resource | |
0686e4f4 | 493 | * - retrieve the channel offers |
90c9960e | 494 | */ |
9aaa995e | 495 | static int vmbus_bus_init(int irq) |
3e7ee490 | 496 | { |
90c9960e GKH |
497 | int ret; |
498 | unsigned int vector; | |
3e7ee490 | 499 | |
6d26e38f GKH |
500 | /* Hypervisor initialization...setup hypercall page..etc */ |
501 | ret = hv_init(); | |
90c9960e | 502 | if (ret != 0) { |
0a46618d | 503 | pr_err("Unable to initialize the hypervisor - 0x%x\n", ret); |
d6c1c5de | 504 | return ret; |
3e7ee490 HJ |
505 | } |
506 | ||
59c0e4f0 | 507 | tasklet_init(&msg_dpc, vmbus_on_msg_dpc, 0); |
66d9229c | 508 | tasklet_init(&event_dpc, vmbus_on_event, 0); |
3e7ee490 | 509 | |
9adcac5c | 510 | ret = bus_register(&hv_bus); |
d6c1c5de | 511 | if (ret) |
8b9987e9 | 512 | goto err_cleanup; |
3e7ee490 | 513 | |
20ed3ef7 | 514 | ret = request_irq(irq, vmbus_isr, 0, driver_name, hv_acpi_dev); |
3e7ee490 | 515 | |
90c9960e | 516 | if (ret != 0) { |
0a46618d | 517 | pr_err("Unable to request IRQ %d\n", |
9aaa995e | 518 | irq); |
8b9987e9 | 519 | goto err_unregister; |
3e7ee490 | 520 | } |
3e7ee490 | 521 | |
9aaa995e | 522 | vector = IRQ0_VECTOR + irq; |
3e7ee490 | 523 | |
800b6902 S |
524 | /* |
525 | * Notify the hypervisor of our irq and | |
526 | * connect to the host. | |
527 | */ | |
528 | on_each_cpu(hv_synic_init, (void *)&vector, 1); | |
529 | ret = vmbus_connect(); | |
8b9987e9 S |
530 | if (ret) |
531 | goto err_irq; | |
800b6902 | 532 | |
2d6e882b | 533 | vmbus_request_offers(); |
8b5d6d3b | 534 | |
d6c1c5de | 535 | return 0; |
8b9987e9 S |
536 | |
537 | err_irq: | |
538 | free_irq(irq, hv_acpi_dev); | |
539 | ||
540 | err_unregister: | |
541 | bus_unregister(&hv_bus); | |
542 | ||
543 | err_cleanup: | |
544 | hv_cleanup(); | |
545 | ||
546 | return ret; | |
3e7ee490 HJ |
547 | } |
548 | ||
90c9960e | 549 | /** |
768fa219 GKH |
550 | * __vmbus_child_driver_register - Register a vmbus's driver |
551 | * @drv: Pointer to driver structure you want to register | |
552 | * @owner: owner module of the drv | |
553 | * @mod_name: module name string | |
3e189519 HJ |
554 | * |
555 | * Registers the given driver with Linux through the 'driver_register()' call | |
768fa219 | 556 | * and sets up the hyper-v vmbus handling for this driver. |
3e189519 HJ |
557 | * It will return the state of the 'driver_register()' call. |
558 | * | |
90c9960e | 559 | */ |
768fa219 | 560 | int __vmbus_driver_register(struct hv_driver *hv_driver, struct module *owner, const char *mod_name) |
3e7ee490 | 561 | { |
5d48a1c2 | 562 | int ret; |
3e7ee490 | 563 | |
768fa219 | 564 | pr_info("registering driver %s\n", hv_driver->name); |
3e7ee490 | 565 | |
cf6a2eac S |
566 | ret = vmbus_exists(); |
567 | if (ret < 0) | |
568 | return ret; | |
569 | ||
768fa219 GKH |
570 | hv_driver->driver.name = hv_driver->name; |
571 | hv_driver->driver.owner = owner; | |
572 | hv_driver->driver.mod_name = mod_name; | |
573 | hv_driver->driver.bus = &hv_bus; | |
3e7ee490 | 574 | |
768fa219 | 575 | ret = driver_register(&hv_driver->driver); |
3e7ee490 | 576 | |
2d6e882b | 577 | vmbus_request_offers(); |
3e7ee490 | 578 | |
5d48a1c2 | 579 | return ret; |
3e7ee490 | 580 | } |
768fa219 | 581 | EXPORT_SYMBOL_GPL(__vmbus_driver_register); |
3e7ee490 | 582 | |
90c9960e | 583 | /** |
768fa219 GKH |
584 | * vmbus_driver_unregister() - Unregister a vmbus's driver |
585 | * @drv: Pointer to driver structure you want to un-register | |
3e189519 | 586 | * |
768fa219 GKH |
587 | * Un-register the given driver that was previous registered with a call to |
588 | * vmbus_driver_register() | |
90c9960e | 589 | */ |
768fa219 | 590 | void vmbus_driver_unregister(struct hv_driver *hv_driver) |
3e7ee490 | 591 | { |
768fa219 | 592 | pr_info("unregistering driver %s\n", hv_driver->name); |
3e7ee490 | 593 | |
cf6a2eac | 594 | if (!vmbus_exists()) |
8f257a14 | 595 | driver_unregister(&hv_driver->driver); |
3e7ee490 | 596 | } |
768fa219 | 597 | EXPORT_SYMBOL_GPL(vmbus_driver_unregister); |
3e7ee490 | 598 | |
3e189519 | 599 | /* |
f2c73011 | 600 | * vmbus_device_create - Creates and registers a new child device |
3e189519 | 601 | * on the vmbus. |
90c9960e | 602 | */ |
f2c73011 | 603 | struct hv_device *vmbus_device_create(uuid_le *type, |
358d2ee2 | 604 | uuid_le *instance, |
89733aa9 | 605 | struct vmbus_channel *channel) |
3e7ee490 | 606 | { |
3d3b5518 | 607 | struct hv_device *child_device_obj; |
3e7ee490 | 608 | |
6bad88da S |
609 | child_device_obj = kzalloc(sizeof(struct hv_device), GFP_KERNEL); |
610 | if (!child_device_obj) { | |
0a46618d | 611 | pr_err("Unable to allocate device object for child device\n"); |
3e7ee490 HJ |
612 | return NULL; |
613 | } | |
614 | ||
cae5b843 | 615 | child_device_obj->channel = channel; |
358d2ee2 | 616 | memcpy(&child_device_obj->dev_type, type, sizeof(uuid_le)); |
ca623ad3 | 617 | memcpy(&child_device_obj->dev_instance, instance, |
358d2ee2 | 618 | sizeof(uuid_le)); |
3e7ee490 | 619 | |
3e7ee490 | 620 | |
3e7ee490 HJ |
621 | return child_device_obj; |
622 | } | |
623 | ||
3e189519 | 624 | /* |
22794281 | 625 | * vmbus_device_register - Register the child device |
90c9960e | 626 | */ |
22794281 | 627 | int vmbus_device_register(struct hv_device *child_device_obj) |
3e7ee490 | 628 | { |
90c9960e | 629 | int ret = 0; |
6bad88da | 630 | |
f4888417 | 631 | static atomic_t device_num = ATOMIC_INIT(0); |
3e7ee490 | 632 | |
6bad88da | 633 | dev_set_name(&child_device_obj->device, "vmbus_0_%d", |
90c9960e | 634 | atomic_inc_return(&device_num)); |
3e7ee490 | 635 | |
0bce28b6 | 636 | child_device_obj->device.bus = &hv_bus; |
607c1a11 | 637 | child_device_obj->device.parent = &hv_acpi_dev->dev; |
6bad88da | 638 | child_device_obj->device.release = vmbus_device_release; |
3e7ee490 | 639 | |
90c9960e GKH |
640 | /* |
641 | * Register with the LDM. This will kick off the driver/device | |
642 | * binding...which will eventually call vmbus_match() and vmbus_probe() | |
643 | */ | |
6bad88da | 644 | ret = device_register(&child_device_obj->device); |
3e7ee490 | 645 | |
3e7ee490 | 646 | if (ret) |
0a46618d | 647 | pr_err("Unable to register child device\n"); |
3e7ee490 | 648 | else |
0a46618d HJ |
649 | pr_info("child device %s registered\n", |
650 | dev_name(&child_device_obj->device)); | |
3e7ee490 | 651 | |
3e7ee490 HJ |
652 | return ret; |
653 | } | |
654 | ||
3e189519 | 655 | /* |
696453ba | 656 | * vmbus_device_unregister - Remove the specified child device |
3e189519 | 657 | * from the vmbus. |
90c9960e | 658 | */ |
696453ba | 659 | void vmbus_device_unregister(struct hv_device *device_obj) |
3e7ee490 | 660 | { |
90c9960e GKH |
661 | /* |
662 | * Kick off the process of unregistering the device. | |
663 | * This will call vmbus_remove() and eventually vmbus_device_release() | |
664 | */ | |
6bad88da | 665 | device_unregister(&device_obj->device); |
3e7ee490 | 666 | |
0a46618d HJ |
667 | pr_info("child device %s unregistered\n", |
668 | dev_name(&device_obj->device)); | |
3e7ee490 HJ |
669 | } |
670 | ||
3e7ee490 | 671 | |
b0069f43 S |
672 | /* |
673 | * VMBUS is an acpi enumerated device. Get the the IRQ information | |
674 | * from DSDT. | |
675 | */ | |
676 | ||
677 | static acpi_status vmbus_walk_resources(struct acpi_resource *res, void *irq) | |
678 | { | |
679 | ||
680 | if (res->type == ACPI_RESOURCE_TYPE_IRQ) { | |
681 | struct acpi_resource_irq *irqp; | |
682 | irqp = &res->data.irq; | |
683 | ||
684 | *((unsigned int *)irq) = irqp->interrupts[0]; | |
685 | } | |
686 | ||
687 | return AE_OK; | |
688 | } | |
689 | ||
690 | static int vmbus_acpi_add(struct acpi_device *device) | |
691 | { | |
692 | acpi_status result; | |
693 | ||
607c1a11 S |
694 | hv_acpi_dev = device; |
695 | ||
0a4425b6 S |
696 | result = acpi_walk_resources(device->handle, METHOD_NAME__CRS, |
697 | vmbus_walk_resources, &irq); | |
b0069f43 S |
698 | |
699 | if (ACPI_FAILURE(result)) { | |
700 | complete(&probe_event); | |
701 | return -ENODEV; | |
702 | } | |
703 | complete(&probe_event); | |
704 | return 0; | |
705 | } | |
706 | ||
707 | static const struct acpi_device_id vmbus_acpi_device_ids[] = { | |
708 | {"VMBUS", 0}, | |
9d7b18d1 | 709 | {"VMBus", 0}, |
b0069f43 S |
710 | {"", 0}, |
711 | }; | |
712 | MODULE_DEVICE_TABLE(acpi, vmbus_acpi_device_ids); | |
713 | ||
714 | static struct acpi_driver vmbus_acpi_driver = { | |
715 | .name = "vmbus", | |
716 | .ids = vmbus_acpi_device_ids, | |
717 | .ops = { | |
718 | .add = vmbus_acpi_add, | |
719 | }, | |
720 | }; | |
721 | ||
0592969e JW |
722 | /* |
723 | * query_hypervisor_presence | |
724 | * - Query the cpuid for presence of windows hypervisor | |
725 | */ | |
726 | static int query_hypervisor_presence(void) | |
727 | { | |
728 | unsigned int eax; | |
729 | unsigned int ebx; | |
730 | unsigned int ecx; | |
731 | unsigned int edx; | |
732 | unsigned int op; | |
733 | ||
734 | eax = 0; | |
735 | ebx = 0; | |
736 | ecx = 0; | |
737 | edx = 0; | |
738 | op = HVCPUID_VERSION_FEATURES; | |
739 | cpuid(op, &eax, &ebx, &ecx, &edx); | |
740 | ||
741 | return ecx & HV_PRESENT_BIT; | |
742 | } | |
743 | ||
607c1a11 | 744 | static int __init hv_acpi_init(void) |
1168ac22 | 745 | { |
2dda95f8 | 746 | int ret, t; |
b0069f43 | 747 | |
0592969e JW |
748 | if (!query_hypervisor_presence()) |
749 | return -ENODEV; | |
750 | ||
b0069f43 S |
751 | init_completion(&probe_event); |
752 | ||
753 | /* | |
754 | * Get irq resources first. | |
755 | */ | |
756 | ||
0246604c S |
757 | ret = acpi_bus_register_driver(&vmbus_acpi_driver); |
758 | ||
b0069f43 S |
759 | if (ret) |
760 | return ret; | |
761 | ||
2dda95f8 S |
762 | t = wait_for_completion_timeout(&probe_event, 5*HZ); |
763 | if (t == 0) { | |
764 | ret = -ETIMEDOUT; | |
765 | goto cleanup; | |
766 | } | |
b0069f43 S |
767 | |
768 | if (irq <= 0) { | |
2dda95f8 S |
769 | ret = -ENODEV; |
770 | goto cleanup; | |
b0069f43 S |
771 | } |
772 | ||
91fd799e S |
773 | ret = vmbus_bus_init(irq); |
774 | if (ret) | |
2dda95f8 S |
775 | goto cleanup; |
776 | ||
777 | return 0; | |
778 | ||
779 | cleanup: | |
780 | acpi_bus_unregister_driver(&vmbus_acpi_driver); | |
cf6a2eac | 781 | hv_acpi_dev = NULL; |
91fd799e | 782 | return ret; |
1168ac22 S |
783 | } |
784 | ||
93e5bd06 S |
785 | static void __exit vmbus_exit(void) |
786 | { | |
787 | ||
788 | free_irq(irq, hv_acpi_dev); | |
789 | vmbus_free_channels(); | |
790 | bus_unregister(&hv_bus); | |
791 | hv_cleanup(); | |
792 | acpi_bus_unregister_driver(&vmbus_acpi_driver); | |
793 | } | |
794 | ||
1168ac22 | 795 | |
90c9960e | 796 | MODULE_LICENSE("GPL"); |
26c14cc1 | 797 | MODULE_VERSION(HV_DRV_VERSION); |
3e7ee490 | 798 | |
43d4e119 | 799 | subsys_initcall(hv_acpi_init); |
93e5bd06 | 800 | module_exit(vmbus_exit); |