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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> |
1f94ea81 | 37 | #include <asm/hypervisor.h> |
0f2a6619 | 38 | #include "hyperv_vmbus.h" |
3e7ee490 | 39 | |
3e7ee490 | 40 | |
607c1a11 | 41 | static struct acpi_device *hv_acpi_dev; |
1168ac22 | 42 | |
59c0e4f0 | 43 | static struct tasklet_struct msg_dpc; |
66d9229c | 44 | static struct tasklet_struct event_dpc; |
71a6655d | 45 | static struct completion probe_event; |
b0069f43 | 46 | static int irq; |
98db4335 | 47 | |
15b80d64 GKH |
48 | struct hv_device_info { |
49 | u32 chn_id; | |
50 | u32 chn_state; | |
51 | uuid_le chn_type; | |
52 | uuid_le chn_instance; | |
53 | ||
54 | u32 monitor_id; | |
55 | u32 server_monitor_pending; | |
56 | u32 server_monitor_latency; | |
57 | u32 server_monitor_conn_id; | |
58 | u32 client_monitor_pending; | |
59 | u32 client_monitor_latency; | |
60 | u32 client_monitor_conn_id; | |
61 | ||
62 | struct hv_dev_port_info inbound; | |
63 | struct hv_dev_port_info outbound; | |
64 | }; | |
65 | ||
cf6a2eac S |
66 | static int vmbus_exists(void) |
67 | { | |
68 | if (hv_acpi_dev == NULL) | |
69 | return -ENODEV; | |
70 | ||
71 | return 0; | |
72 | } | |
73 | ||
15b80d64 | 74 | |
98db4335 S |
75 | static void get_channel_info(struct hv_device *device, |
76 | struct hv_device_info *info) | |
77 | { | |
78 | struct vmbus_channel_debug_info debug_info; | |
79 | ||
80 | if (!device->channel) | |
81 | return; | |
82 | ||
83 | vmbus_get_debug_info(device->channel, &debug_info); | |
84 | ||
85 | info->chn_id = debug_info.relid; | |
86 | info->chn_state = debug_info.state; | |
87 | memcpy(&info->chn_type, &debug_info.interfacetype, | |
358d2ee2 | 88 | sizeof(uuid_le)); |
98db4335 | 89 | memcpy(&info->chn_instance, &debug_info.interface_instance, |
358d2ee2 | 90 | sizeof(uuid_le)); |
98db4335 S |
91 | |
92 | info->monitor_id = debug_info.monitorid; | |
93 | ||
94 | info->server_monitor_pending = debug_info.servermonitor_pending; | |
95 | info->server_monitor_latency = debug_info.servermonitor_latency; | |
96 | info->server_monitor_conn_id = debug_info.servermonitor_connectionid; | |
97 | ||
98 | info->client_monitor_pending = debug_info.clientmonitor_pending; | |
99 | info->client_monitor_latency = debug_info.clientmonitor_latency; | |
100 | info->client_monitor_conn_id = debug_info.clientmonitor_connectionid; | |
101 | ||
102 | info->inbound.int_mask = debug_info.inbound.current_interrupt_mask; | |
103 | info->inbound.read_idx = debug_info.inbound.current_read_index; | |
104 | info->inbound.write_idx = debug_info.inbound.current_write_index; | |
105 | info->inbound.bytes_avail_toread = | |
106 | debug_info.inbound.bytes_avail_toread; | |
107 | info->inbound.bytes_avail_towrite = | |
108 | debug_info.inbound.bytes_avail_towrite; | |
3e7ee490 | 109 | |
98db4335 S |
110 | info->outbound.int_mask = |
111 | debug_info.outbound.current_interrupt_mask; | |
112 | info->outbound.read_idx = debug_info.outbound.current_read_index; | |
113 | info->outbound.write_idx = debug_info.outbound.current_write_index; | |
114 | info->outbound.bytes_avail_toread = | |
115 | debug_info.outbound.bytes_avail_toread; | |
116 | info->outbound.bytes_avail_towrite = | |
117 | debug_info.outbound.bytes_avail_towrite; | |
118 | } | |
3e7ee490 | 119 | |
fd776ba9 OH |
120 | #define VMBUS_ALIAS_LEN ((sizeof((struct hv_vmbus_device_id *)0)->guid) * 2) |
121 | static void print_alias_name(struct hv_device *hv_dev, char *alias_name) | |
122 | { | |
123 | int i; | |
124 | for (i = 0; i < VMBUS_ALIAS_LEN; i += 2) | |
125 | sprintf(&alias_name[i], "%02x", hv_dev->dev_type.b[i/2]); | |
126 | } | |
127 | ||
98db4335 S |
128 | /* |
129 | * vmbus_show_device_attr - Show the device attribute in sysfs. | |
130 | * | |
131 | * This is invoked when user does a | |
132 | * "cat /sys/bus/vmbus/devices/<busdevice>/<attr name>" | |
133 | */ | |
90c9960e GKH |
134 | static ssize_t vmbus_show_device_attr(struct device *dev, |
135 | struct device_attribute *dev_attr, | |
98db4335 S |
136 | char *buf) |
137 | { | |
e8e27047 | 138 | struct hv_device *hv_dev = device_to_hv_device(dev); |
7bb52384 | 139 | struct hv_device_info *device_info; |
fd776ba9 | 140 | char alias_name[VMBUS_ALIAS_LEN + 1]; |
7bb52384 | 141 | int ret = 0; |
3e7ee490 | 142 | |
7bb52384 S |
143 | device_info = kzalloc(sizeof(struct hv_device_info), GFP_KERNEL); |
144 | if (!device_info) | |
145 | return ret; | |
3e7ee490 | 146 | |
7bb52384 | 147 | get_channel_info(hv_dev, device_info); |
3e7ee490 | 148 | |
98db4335 | 149 | if (!strcmp(dev_attr->attr.name, "class_id")) { |
2221f6ef | 150 | ret = sprintf(buf, "{%pUl}\n", device_info->chn_type.b); |
98db4335 | 151 | } else if (!strcmp(dev_attr->attr.name, "device_id")) { |
2221f6ef | 152 | ret = sprintf(buf, "{%pUl}\n", device_info->chn_instance.b); |
fd776ba9 OH |
153 | } else if (!strcmp(dev_attr->attr.name, "modalias")) { |
154 | print_alias_name(hv_dev, alias_name); | |
7bb52384 | 155 | ret = sprintf(buf, "vmbus:%s\n", alias_name); |
98db4335 | 156 | } else if (!strcmp(dev_attr->attr.name, "state")) { |
7bb52384 | 157 | ret = sprintf(buf, "%d\n", device_info->chn_state); |
98db4335 | 158 | } else if (!strcmp(dev_attr->attr.name, "id")) { |
7bb52384 | 159 | ret = sprintf(buf, "%d\n", device_info->chn_id); |
98db4335 | 160 | } else if (!strcmp(dev_attr->attr.name, "out_intr_mask")) { |
7bb52384 | 161 | ret = sprintf(buf, "%d\n", device_info->outbound.int_mask); |
98db4335 | 162 | } else if (!strcmp(dev_attr->attr.name, "out_read_index")) { |
7bb52384 | 163 | ret = sprintf(buf, "%d\n", device_info->outbound.read_idx); |
98db4335 | 164 | } else if (!strcmp(dev_attr->attr.name, "out_write_index")) { |
7bb52384 | 165 | ret = sprintf(buf, "%d\n", device_info->outbound.write_idx); |
98db4335 | 166 | } else if (!strcmp(dev_attr->attr.name, "out_read_bytes_avail")) { |
7bb52384 S |
167 | ret = sprintf(buf, "%d\n", |
168 | device_info->outbound.bytes_avail_toread); | |
98db4335 | 169 | } else if (!strcmp(dev_attr->attr.name, "out_write_bytes_avail")) { |
7bb52384 S |
170 | ret = sprintf(buf, "%d\n", |
171 | device_info->outbound.bytes_avail_towrite); | |
98db4335 | 172 | } else if (!strcmp(dev_attr->attr.name, "in_intr_mask")) { |
7bb52384 | 173 | ret = sprintf(buf, "%d\n", device_info->inbound.int_mask); |
98db4335 | 174 | } else if (!strcmp(dev_attr->attr.name, "in_read_index")) { |
7bb52384 | 175 | ret = sprintf(buf, "%d\n", device_info->inbound.read_idx); |
98db4335 | 176 | } else if (!strcmp(dev_attr->attr.name, "in_write_index")) { |
7bb52384 | 177 | ret = sprintf(buf, "%d\n", device_info->inbound.write_idx); |
98db4335 | 178 | } else if (!strcmp(dev_attr->attr.name, "in_read_bytes_avail")) { |
7bb52384 S |
179 | ret = sprintf(buf, "%d\n", |
180 | device_info->inbound.bytes_avail_toread); | |
98db4335 | 181 | } else if (!strcmp(dev_attr->attr.name, "in_write_bytes_avail")) { |
7bb52384 S |
182 | ret = sprintf(buf, "%d\n", |
183 | device_info->inbound.bytes_avail_towrite); | |
98db4335 | 184 | } else if (!strcmp(dev_attr->attr.name, "monitor_id")) { |
7bb52384 | 185 | ret = sprintf(buf, "%d\n", device_info->monitor_id); |
98db4335 | 186 | } else if (!strcmp(dev_attr->attr.name, "server_monitor_pending")) { |
7bb52384 | 187 | ret = sprintf(buf, "%d\n", device_info->server_monitor_pending); |
98db4335 | 188 | } else if (!strcmp(dev_attr->attr.name, "server_monitor_latency")) { |
7bb52384 | 189 | ret = sprintf(buf, "%d\n", device_info->server_monitor_latency); |
98db4335 | 190 | } else if (!strcmp(dev_attr->attr.name, "server_monitor_conn_id")) { |
7bb52384 S |
191 | ret = sprintf(buf, "%d\n", |
192 | device_info->server_monitor_conn_id); | |
98db4335 | 193 | } else if (!strcmp(dev_attr->attr.name, "client_monitor_pending")) { |
7bb52384 | 194 | ret = sprintf(buf, "%d\n", device_info->client_monitor_pending); |
98db4335 | 195 | } else if (!strcmp(dev_attr->attr.name, "client_monitor_latency")) { |
7bb52384 | 196 | ret = sprintf(buf, "%d\n", device_info->client_monitor_latency); |
98db4335 | 197 | } else if (!strcmp(dev_attr->attr.name, "client_monitor_conn_id")) { |
7bb52384 S |
198 | ret = sprintf(buf, "%d\n", |
199 | device_info->client_monitor_conn_id); | |
98db4335 | 200 | } |
7bb52384 S |
201 | |
202 | kfree(device_info); | |
203 | return ret; | |
98db4335 | 204 | } |
3e7ee490 | 205 | |
454f18a9 | 206 | /* Set up per device attributes in /sys/bus/vmbus/devices/<bus device> */ |
3e7ee490 HJ |
207 | static struct device_attribute vmbus_device_attrs[] = { |
208 | __ATTR(id, S_IRUGO, vmbus_show_device_attr, NULL), | |
209 | __ATTR(state, S_IRUGO, vmbus_show_device_attr, NULL), | |
210 | __ATTR(class_id, S_IRUGO, vmbus_show_device_attr, NULL), | |
211 | __ATTR(device_id, S_IRUGO, vmbus_show_device_attr, NULL), | |
212 | __ATTR(monitor_id, S_IRUGO, vmbus_show_device_attr, NULL), | |
fd776ba9 | 213 | __ATTR(modalias, S_IRUGO, vmbus_show_device_attr, NULL), |
3e7ee490 HJ |
214 | |
215 | __ATTR(server_monitor_pending, S_IRUGO, vmbus_show_device_attr, NULL), | |
216 | __ATTR(server_monitor_latency, S_IRUGO, vmbus_show_device_attr, NULL), | |
217 | __ATTR(server_monitor_conn_id, S_IRUGO, vmbus_show_device_attr, NULL), | |
218 | ||
219 | __ATTR(client_monitor_pending, S_IRUGO, vmbus_show_device_attr, NULL), | |
220 | __ATTR(client_monitor_latency, S_IRUGO, vmbus_show_device_attr, NULL), | |
221 | __ATTR(client_monitor_conn_id, S_IRUGO, vmbus_show_device_attr, NULL), | |
222 | ||
223 | __ATTR(out_intr_mask, S_IRUGO, vmbus_show_device_attr, NULL), | |
224 | __ATTR(out_read_index, S_IRUGO, vmbus_show_device_attr, NULL), | |
225 | __ATTR(out_write_index, S_IRUGO, vmbus_show_device_attr, NULL), | |
226 | __ATTR(out_read_bytes_avail, S_IRUGO, vmbus_show_device_attr, NULL), | |
227 | __ATTR(out_write_bytes_avail, S_IRUGO, vmbus_show_device_attr, NULL), | |
228 | ||
229 | __ATTR(in_intr_mask, S_IRUGO, vmbus_show_device_attr, NULL), | |
230 | __ATTR(in_read_index, S_IRUGO, vmbus_show_device_attr, NULL), | |
231 | __ATTR(in_write_index, S_IRUGO, vmbus_show_device_attr, NULL), | |
232 | __ATTR(in_read_bytes_avail, S_IRUGO, vmbus_show_device_attr, NULL), | |
233 | __ATTR(in_write_bytes_avail, S_IRUGO, vmbus_show_device_attr, NULL), | |
234 | __ATTR_NULL | |
235 | }; | |
3e7ee490 | 236 | |
793be9c7 | 237 | |
adde2487 S |
238 | /* |
239 | * vmbus_uevent - add uevent for our device | |
240 | * | |
241 | * This routine is invoked when a device is added or removed on the vmbus to | |
242 | * generate a uevent to udev in the userspace. The udev will then look at its | |
243 | * rule and the uevent generated here to load the appropriate driver | |
0ddda660 S |
244 | * |
245 | * The alias string will be of the form vmbus:guid where guid is the string | |
246 | * representation of the device guid (each byte of the guid will be | |
247 | * represented with two hex characters. | |
adde2487 S |
248 | */ |
249 | static int vmbus_uevent(struct device *device, struct kobj_uevent_env *env) | |
250 | { | |
251 | struct hv_device *dev = device_to_hv_device(device); | |
fd776ba9 OH |
252 | int ret; |
253 | char alias_name[VMBUS_ALIAS_LEN + 1]; | |
0ddda660 | 254 | |
fd776ba9 | 255 | print_alias_name(dev, alias_name); |
0ddda660 S |
256 | ret = add_uevent_var(env, "MODALIAS=vmbus:%s", alias_name); |
257 | return ret; | |
adde2487 S |
258 | } |
259 | ||
5841a829 S |
260 | static uuid_le null_guid; |
261 | ||
262 | static inline bool is_null_guid(const __u8 *guid) | |
263 | { | |
264 | if (memcmp(guid, &null_guid, sizeof(uuid_le))) | |
265 | return false; | |
266 | return true; | |
267 | } | |
268 | ||
3037a7b6 S |
269 | /* |
270 | * Return a matching hv_vmbus_device_id pointer. | |
271 | * If there is no match, return NULL. | |
272 | */ | |
273 | static const struct hv_vmbus_device_id *hv_vmbus_get_id( | |
274 | const struct hv_vmbus_device_id *id, | |
275 | __u8 *guid) | |
276 | { | |
277 | for (; !is_null_guid(id->guid); id++) | |
278 | if (!memcmp(&id->guid, guid, sizeof(uuid_le))) | |
279 | return id; | |
280 | ||
281 | return NULL; | |
282 | } | |
283 | ||
284 | ||
b7fc147b S |
285 | |
286 | /* | |
287 | * vmbus_match - Attempt to match the specified device to the specified driver | |
288 | */ | |
289 | static int vmbus_match(struct device *device, struct device_driver *driver) | |
290 | { | |
b7fc147b | 291 | struct hv_driver *drv = drv_to_hv_drv(driver); |
e8e27047 | 292 | struct hv_device *hv_dev = device_to_hv_device(device); |
b7fc147b | 293 | |
3037a7b6 S |
294 | if (hv_vmbus_get_id(drv->id_table, hv_dev->dev_type.b)) |
295 | return 1; | |
de632a2b | 296 | |
5841a829 | 297 | return 0; |
b7fc147b S |
298 | } |
299 | ||
f1f0d67b S |
300 | /* |
301 | * vmbus_probe - Add the new vmbus's child device | |
302 | */ | |
303 | static int vmbus_probe(struct device *child_device) | |
304 | { | |
305 | int ret = 0; | |
306 | struct hv_driver *drv = | |
307 | drv_to_hv_drv(child_device->driver); | |
9efd21e1 | 308 | struct hv_device *dev = device_to_hv_device(child_device); |
84946899 | 309 | const struct hv_vmbus_device_id *dev_id; |
f1f0d67b | 310 | |
84946899 | 311 | dev_id = hv_vmbus_get_id(drv->id_table, dev->dev_type.b); |
9efd21e1 | 312 | if (drv->probe) { |
84946899 | 313 | ret = drv->probe(dev, dev_id); |
b14a7b30 | 314 | if (ret != 0) |
0a46618d HJ |
315 | pr_err("probe failed for device %s (%d)\n", |
316 | dev_name(child_device), ret); | |
f1f0d67b | 317 | |
f1f0d67b | 318 | } else { |
0a46618d HJ |
319 | pr_err("probe not set for driver %s\n", |
320 | dev_name(child_device)); | |
6de925b1 | 321 | ret = -ENODEV; |
f1f0d67b S |
322 | } |
323 | return ret; | |
324 | } | |
325 | ||
c5dce3db S |
326 | /* |
327 | * vmbus_remove - Remove a vmbus device | |
328 | */ | |
329 | static int vmbus_remove(struct device *child_device) | |
330 | { | |
d4372179 | 331 | struct hv_driver *drv = drv_to_hv_drv(child_device->driver); |
415b023a | 332 | struct hv_device *dev = device_to_hv_device(child_device); |
c5dce3db | 333 | |
d4372179 S |
334 | if (drv->remove) |
335 | drv->remove(dev); | |
336 | else | |
337 | pr_err("remove not set for driver %s\n", | |
338 | dev_name(child_device)); | |
c5dce3db S |
339 | |
340 | return 0; | |
341 | } | |
342 | ||
eb1bb259 S |
343 | |
344 | /* | |
345 | * vmbus_shutdown - Shutdown a vmbus device | |
346 | */ | |
347 | static void vmbus_shutdown(struct device *child_device) | |
348 | { | |
349 | struct hv_driver *drv; | |
ca6887fb | 350 | struct hv_device *dev = device_to_hv_device(child_device); |
eb1bb259 S |
351 | |
352 | ||
353 | /* The device may not be attached yet */ | |
354 | if (!child_device->driver) | |
355 | return; | |
356 | ||
357 | drv = drv_to_hv_drv(child_device->driver); | |
358 | ||
ca6887fb S |
359 | if (drv->shutdown) |
360 | drv->shutdown(dev); | |
eb1bb259 S |
361 | |
362 | return; | |
363 | } | |
364 | ||
086e7a56 S |
365 | |
366 | /* | |
367 | * vmbus_device_release - Final callback release of the vmbus child device | |
368 | */ | |
369 | static void vmbus_device_release(struct device *device) | |
370 | { | |
e8e27047 | 371 | struct hv_device *hv_dev = device_to_hv_device(device); |
086e7a56 | 372 | |
e8e27047 | 373 | kfree(hv_dev); |
086e7a56 S |
374 | |
375 | } | |
376 | ||
454f18a9 | 377 | /* The one and only one */ |
9adcac5c S |
378 | static struct bus_type hv_bus = { |
379 | .name = "vmbus", | |
380 | .match = vmbus_match, | |
381 | .shutdown = vmbus_shutdown, | |
382 | .remove = vmbus_remove, | |
383 | .probe = vmbus_probe, | |
384 | .uevent = vmbus_uevent, | |
385 | .dev_attrs = vmbus_device_attrs, | |
3e7ee490 HJ |
386 | }; |
387 | ||
adf874cb | 388 | static const char *driver_name = "hyperv"; |
36199a99 | 389 | |
36199a99 | 390 | |
bf6506f6 TT |
391 | struct onmessage_work_context { |
392 | struct work_struct work; | |
393 | struct hv_message msg; | |
394 | }; | |
395 | ||
396 | static void vmbus_onmessage_work(struct work_struct *work) | |
397 | { | |
398 | struct onmessage_work_context *ctx; | |
399 | ||
400 | ctx = container_of(work, struct onmessage_work_context, | |
401 | work); | |
402 | vmbus_onmessage(&ctx->msg); | |
403 | kfree(ctx); | |
404 | } | |
405 | ||
62c1059d | 406 | static void vmbus_on_msg_dpc(unsigned long data) |
36199a99 GKH |
407 | { |
408 | int cpu = smp_processor_id(); | |
409 | void *page_addr = hv_context.synic_message_page[cpu]; | |
410 | struct hv_message *msg = (struct hv_message *)page_addr + | |
411 | VMBUS_MESSAGE_SINT; | |
bf6506f6 | 412 | struct onmessage_work_context *ctx; |
36199a99 GKH |
413 | |
414 | while (1) { | |
415 | if (msg->header.message_type == HVMSG_NONE) { | |
416 | /* no msg */ | |
417 | break; | |
418 | } else { | |
bf6506f6 TT |
419 | ctx = kmalloc(sizeof(*ctx), GFP_ATOMIC); |
420 | if (ctx == NULL) | |
36199a99 | 421 | continue; |
bf6506f6 TT |
422 | INIT_WORK(&ctx->work, vmbus_onmessage_work); |
423 | memcpy(&ctx->msg, msg, sizeof(*msg)); | |
da9fcb72 | 424 | queue_work(vmbus_connection.work_queue, &ctx->work); |
36199a99 GKH |
425 | } |
426 | ||
427 | msg->header.message_type = HVMSG_NONE; | |
428 | ||
429 | /* | |
430 | * Make sure the write to MessageType (ie set to | |
431 | * HVMSG_NONE) happens before we read the | |
432 | * MessagePending and EOMing. Otherwise, the EOMing | |
433 | * will not deliver any more messages since there is | |
434 | * no empty slot | |
435 | */ | |
e826f1d5 | 436 | smp_mb(); |
36199a99 GKH |
437 | |
438 | if (msg->header.message_flags.msg_pending) { | |
439 | /* | |
440 | * This will cause message queue rescan to | |
441 | * possibly deliver another msg from the | |
442 | * hypervisor | |
443 | */ | |
444 | wrmsrl(HV_X64_MSR_EOM, 0); | |
445 | } | |
446 | } | |
447 | } | |
448 | ||
ae4636e6 | 449 | static irqreturn_t vmbus_isr(int irq, void *dev_id) |
36199a99 | 450 | { |
36199a99 GKH |
451 | int cpu = smp_processor_id(); |
452 | void *page_addr; | |
453 | struct hv_message *msg; | |
454 | union hv_synic_event_flags *event; | |
ae4636e6 | 455 | bool handled = false; |
36199a99 | 456 | |
7341d908 S |
457 | /* |
458 | * Check for events before checking for messages. This is the order | |
459 | * in which events and messages are checked in Windows guests on | |
460 | * Hyper-V, and the Windows team suggested we do the same. | |
461 | */ | |
36199a99 | 462 | |
36199a99 GKH |
463 | page_addr = hv_context.synic_event_page[cpu]; |
464 | event = (union hv_synic_event_flags *)page_addr + VMBUS_MESSAGE_SINT; | |
465 | ||
466 | /* Since we are a child, we only need to check bit 0 */ | |
ae4636e6 S |
467 | if (sync_test_and_clear_bit(0, (unsigned long *) &event->flags32[0])) { |
468 | handled = true; | |
469 | tasklet_schedule(&event_dpc); | |
470 | } | |
793be9c7 | 471 | |
7341d908 S |
472 | page_addr = hv_context.synic_message_page[cpu]; |
473 | msg = (struct hv_message *)page_addr + VMBUS_MESSAGE_SINT; | |
474 | ||
475 | /* Check if there are actual msgs to be processed */ | |
476 | if (msg->header.message_type != HVMSG_NONE) { | |
477 | handled = true; | |
478 | tasklet_schedule(&msg_dpc); | |
479 | } | |
480 | ||
ae4636e6 | 481 | if (handled) |
793be9c7 | 482 | return IRQ_HANDLED; |
ae4636e6 | 483 | else |
793be9c7 | 484 | return IRQ_NONE; |
793be9c7 S |
485 | } |
486 | ||
3e189519 | 487 | /* |
90c9960e GKH |
488 | * vmbus_bus_init -Main vmbus driver initialization routine. |
489 | * | |
490 | * Here, we | |
0686e4f4 | 491 | * - initialize the vmbus driver context |
0686e4f4 LL |
492 | * - invoke the vmbus hv main init routine |
493 | * - get the irq resource | |
0686e4f4 | 494 | * - retrieve the channel offers |
90c9960e | 495 | */ |
9aaa995e | 496 | static int vmbus_bus_init(int irq) |
3e7ee490 | 497 | { |
90c9960e GKH |
498 | int ret; |
499 | unsigned int vector; | |
3e7ee490 | 500 | |
6d26e38f GKH |
501 | /* Hypervisor initialization...setup hypercall page..etc */ |
502 | ret = hv_init(); | |
90c9960e | 503 | if (ret != 0) { |
0a46618d | 504 | pr_err("Unable to initialize the hypervisor - 0x%x\n", ret); |
d6c1c5de | 505 | return ret; |
3e7ee490 HJ |
506 | } |
507 | ||
59c0e4f0 | 508 | tasklet_init(&msg_dpc, vmbus_on_msg_dpc, 0); |
66d9229c | 509 | tasklet_init(&event_dpc, vmbus_on_event, 0); |
3e7ee490 | 510 | |
9adcac5c | 511 | ret = bus_register(&hv_bus); |
d6c1c5de | 512 | if (ret) |
8b9987e9 | 513 | goto err_cleanup; |
3e7ee490 | 514 | |
20ed3ef7 | 515 | ret = request_irq(irq, vmbus_isr, 0, driver_name, hv_acpi_dev); |
3e7ee490 | 516 | |
90c9960e | 517 | if (ret != 0) { |
0a46618d | 518 | pr_err("Unable to request IRQ %d\n", |
9aaa995e | 519 | irq); |
8b9987e9 | 520 | goto err_unregister; |
3e7ee490 | 521 | } |
3e7ee490 | 522 | |
9aaa995e | 523 | vector = IRQ0_VECTOR + irq; |
3e7ee490 | 524 | |
800b6902 S |
525 | /* |
526 | * Notify the hypervisor of our irq and | |
527 | * connect to the host. | |
528 | */ | |
529 | on_each_cpu(hv_synic_init, (void *)&vector, 1); | |
530 | ret = vmbus_connect(); | |
8b9987e9 S |
531 | if (ret) |
532 | goto err_irq; | |
800b6902 | 533 | |
2d6e882b | 534 | vmbus_request_offers(); |
8b5d6d3b | 535 | |
d6c1c5de | 536 | return 0; |
8b9987e9 S |
537 | |
538 | err_irq: | |
539 | free_irq(irq, hv_acpi_dev); | |
540 | ||
541 | err_unregister: | |
542 | bus_unregister(&hv_bus); | |
543 | ||
544 | err_cleanup: | |
545 | hv_cleanup(); | |
546 | ||
547 | return ret; | |
3e7ee490 HJ |
548 | } |
549 | ||
90c9960e | 550 | /** |
768fa219 GKH |
551 | * __vmbus_child_driver_register - Register a vmbus's driver |
552 | * @drv: Pointer to driver structure you want to register | |
553 | * @owner: owner module of the drv | |
554 | * @mod_name: module name string | |
3e189519 HJ |
555 | * |
556 | * Registers the given driver with Linux through the 'driver_register()' call | |
768fa219 | 557 | * and sets up the hyper-v vmbus handling for this driver. |
3e189519 HJ |
558 | * It will return the state of the 'driver_register()' call. |
559 | * | |
90c9960e | 560 | */ |
768fa219 | 561 | int __vmbus_driver_register(struct hv_driver *hv_driver, struct module *owner, const char *mod_name) |
3e7ee490 | 562 | { |
5d48a1c2 | 563 | int ret; |
3e7ee490 | 564 | |
768fa219 | 565 | pr_info("registering driver %s\n", hv_driver->name); |
3e7ee490 | 566 | |
cf6a2eac S |
567 | ret = vmbus_exists(); |
568 | if (ret < 0) | |
569 | return ret; | |
570 | ||
768fa219 GKH |
571 | hv_driver->driver.name = hv_driver->name; |
572 | hv_driver->driver.owner = owner; | |
573 | hv_driver->driver.mod_name = mod_name; | |
574 | hv_driver->driver.bus = &hv_bus; | |
3e7ee490 | 575 | |
768fa219 | 576 | ret = driver_register(&hv_driver->driver); |
3e7ee490 | 577 | |
2d6e882b | 578 | vmbus_request_offers(); |
3e7ee490 | 579 | |
5d48a1c2 | 580 | return ret; |
3e7ee490 | 581 | } |
768fa219 | 582 | EXPORT_SYMBOL_GPL(__vmbus_driver_register); |
3e7ee490 | 583 | |
90c9960e | 584 | /** |
768fa219 GKH |
585 | * vmbus_driver_unregister() - Unregister a vmbus's driver |
586 | * @drv: Pointer to driver structure you want to un-register | |
3e189519 | 587 | * |
768fa219 GKH |
588 | * Un-register the given driver that was previous registered with a call to |
589 | * vmbus_driver_register() | |
90c9960e | 590 | */ |
768fa219 | 591 | void vmbus_driver_unregister(struct hv_driver *hv_driver) |
3e7ee490 | 592 | { |
768fa219 | 593 | pr_info("unregistering driver %s\n", hv_driver->name); |
3e7ee490 | 594 | |
cf6a2eac | 595 | if (!vmbus_exists()) |
8f257a14 | 596 | driver_unregister(&hv_driver->driver); |
3e7ee490 | 597 | } |
768fa219 | 598 | EXPORT_SYMBOL_GPL(vmbus_driver_unregister); |
3e7ee490 | 599 | |
3e189519 | 600 | /* |
f2c73011 | 601 | * vmbus_device_create - Creates and registers a new child device |
3e189519 | 602 | * on the vmbus. |
90c9960e | 603 | */ |
f2c73011 | 604 | struct hv_device *vmbus_device_create(uuid_le *type, |
358d2ee2 | 605 | uuid_le *instance, |
89733aa9 | 606 | struct vmbus_channel *channel) |
3e7ee490 | 607 | { |
3d3b5518 | 608 | struct hv_device *child_device_obj; |
3e7ee490 | 609 | |
6bad88da S |
610 | child_device_obj = kzalloc(sizeof(struct hv_device), GFP_KERNEL); |
611 | if (!child_device_obj) { | |
0a46618d | 612 | pr_err("Unable to allocate device object for child device\n"); |
3e7ee490 HJ |
613 | return NULL; |
614 | } | |
615 | ||
cae5b843 | 616 | child_device_obj->channel = channel; |
358d2ee2 | 617 | memcpy(&child_device_obj->dev_type, type, sizeof(uuid_le)); |
ca623ad3 | 618 | memcpy(&child_device_obj->dev_instance, instance, |
358d2ee2 | 619 | sizeof(uuid_le)); |
3e7ee490 | 620 | |
3e7ee490 | 621 | |
3e7ee490 HJ |
622 | return child_device_obj; |
623 | } | |
624 | ||
3e189519 | 625 | /* |
22794281 | 626 | * vmbus_device_register - Register the child device |
90c9960e | 627 | */ |
22794281 | 628 | int vmbus_device_register(struct hv_device *child_device_obj) |
3e7ee490 | 629 | { |
90c9960e | 630 | int ret = 0; |
6bad88da | 631 | |
f4888417 | 632 | static atomic_t device_num = ATOMIC_INIT(0); |
3e7ee490 | 633 | |
6bad88da | 634 | dev_set_name(&child_device_obj->device, "vmbus_0_%d", |
90c9960e | 635 | atomic_inc_return(&device_num)); |
3e7ee490 | 636 | |
0bce28b6 | 637 | child_device_obj->device.bus = &hv_bus; |
607c1a11 | 638 | child_device_obj->device.parent = &hv_acpi_dev->dev; |
6bad88da | 639 | child_device_obj->device.release = vmbus_device_release; |
3e7ee490 | 640 | |
90c9960e GKH |
641 | /* |
642 | * Register with the LDM. This will kick off the driver/device | |
643 | * binding...which will eventually call vmbus_match() and vmbus_probe() | |
644 | */ | |
6bad88da | 645 | ret = device_register(&child_device_obj->device); |
3e7ee490 | 646 | |
3e7ee490 | 647 | if (ret) |
0a46618d | 648 | pr_err("Unable to register child device\n"); |
3e7ee490 | 649 | else |
0a46618d HJ |
650 | pr_info("child device %s registered\n", |
651 | dev_name(&child_device_obj->device)); | |
3e7ee490 | 652 | |
3e7ee490 HJ |
653 | return ret; |
654 | } | |
655 | ||
3e189519 | 656 | /* |
696453ba | 657 | * vmbus_device_unregister - Remove the specified child device |
3e189519 | 658 | * from the vmbus. |
90c9960e | 659 | */ |
696453ba | 660 | void vmbus_device_unregister(struct hv_device *device_obj) |
3e7ee490 | 661 | { |
90c9960e GKH |
662 | /* |
663 | * Kick off the process of unregistering the device. | |
664 | * This will call vmbus_remove() and eventually vmbus_device_release() | |
665 | */ | |
6bad88da | 666 | device_unregister(&device_obj->device); |
3e7ee490 | 667 | |
0a46618d HJ |
668 | pr_info("child device %s unregistered\n", |
669 | dev_name(&device_obj->device)); | |
3e7ee490 HJ |
670 | } |
671 | ||
3e7ee490 | 672 | |
b0069f43 S |
673 | /* |
674 | * VMBUS is an acpi enumerated device. Get the the IRQ information | |
675 | * from DSDT. | |
676 | */ | |
677 | ||
678 | static acpi_status vmbus_walk_resources(struct acpi_resource *res, void *irq) | |
679 | { | |
680 | ||
681 | if (res->type == ACPI_RESOURCE_TYPE_IRQ) { | |
682 | struct acpi_resource_irq *irqp; | |
683 | irqp = &res->data.irq; | |
684 | ||
685 | *((unsigned int *)irq) = irqp->interrupts[0]; | |
686 | } | |
687 | ||
688 | return AE_OK; | |
689 | } | |
690 | ||
691 | static int vmbus_acpi_add(struct acpi_device *device) | |
692 | { | |
693 | acpi_status result; | |
694 | ||
607c1a11 S |
695 | hv_acpi_dev = device; |
696 | ||
0a4425b6 S |
697 | result = acpi_walk_resources(device->handle, METHOD_NAME__CRS, |
698 | vmbus_walk_resources, &irq); | |
b0069f43 S |
699 | |
700 | if (ACPI_FAILURE(result)) { | |
701 | complete(&probe_event); | |
702 | return -ENODEV; | |
703 | } | |
704 | complete(&probe_event); | |
705 | return 0; | |
706 | } | |
707 | ||
708 | static const struct acpi_device_id vmbus_acpi_device_ids[] = { | |
709 | {"VMBUS", 0}, | |
9d7b18d1 | 710 | {"VMBus", 0}, |
b0069f43 S |
711 | {"", 0}, |
712 | }; | |
713 | MODULE_DEVICE_TABLE(acpi, vmbus_acpi_device_ids); | |
714 | ||
715 | static struct acpi_driver vmbus_acpi_driver = { | |
716 | .name = "vmbus", | |
717 | .ids = vmbus_acpi_device_ids, | |
718 | .ops = { | |
719 | .add = vmbus_acpi_add, | |
720 | }, | |
721 | }; | |
722 | ||
607c1a11 | 723 | static int __init hv_acpi_init(void) |
1168ac22 | 724 | { |
2dda95f8 | 725 | int ret, t; |
b0069f43 | 726 | |
1f94ea81 | 727 | if (x86_hyper != &x86_hyper_ms_hyperv) |
0592969e JW |
728 | return -ENODEV; |
729 | ||
b0069f43 S |
730 | init_completion(&probe_event); |
731 | ||
732 | /* | |
733 | * Get irq resources first. | |
734 | */ | |
735 | ||
0246604c S |
736 | ret = acpi_bus_register_driver(&vmbus_acpi_driver); |
737 | ||
b0069f43 S |
738 | if (ret) |
739 | return ret; | |
740 | ||
2dda95f8 S |
741 | t = wait_for_completion_timeout(&probe_event, 5*HZ); |
742 | if (t == 0) { | |
743 | ret = -ETIMEDOUT; | |
744 | goto cleanup; | |
745 | } | |
b0069f43 S |
746 | |
747 | if (irq <= 0) { | |
2dda95f8 S |
748 | ret = -ENODEV; |
749 | goto cleanup; | |
b0069f43 S |
750 | } |
751 | ||
91fd799e S |
752 | ret = vmbus_bus_init(irq); |
753 | if (ret) | |
2dda95f8 S |
754 | goto cleanup; |
755 | ||
756 | return 0; | |
757 | ||
758 | cleanup: | |
759 | acpi_bus_unregister_driver(&vmbus_acpi_driver); | |
cf6a2eac | 760 | hv_acpi_dev = NULL; |
91fd799e | 761 | return ret; |
1168ac22 S |
762 | } |
763 | ||
93e5bd06 S |
764 | static void __exit vmbus_exit(void) |
765 | { | |
766 | ||
767 | free_irq(irq, hv_acpi_dev); | |
768 | vmbus_free_channels(); | |
769 | bus_unregister(&hv_bus); | |
770 | hv_cleanup(); | |
771 | acpi_bus_unregister_driver(&vmbus_acpi_driver); | |
772 | } | |
773 | ||
1168ac22 | 774 | |
90c9960e | 775 | MODULE_LICENSE("GPL"); |
26c14cc1 | 776 | MODULE_VERSION(HV_DRV_VERSION); |
3e7ee490 | 777 | |
43d4e119 | 778 | subsys_initcall(hv_acpi_init); |
93e5bd06 | 779 | module_exit(vmbus_exit); |