Commit | Line | Data |
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3e7ee490 | 1 | /* |
3e7ee490 HJ |
2 | * Copyright (c) 2009, Microsoft Corporation. |
3 | * | |
4 | * This program is free software; you can redistribute it and/or modify it | |
5 | * under the terms and conditions of the GNU General Public License, | |
6 | * version 2, as published by the Free Software Foundation. | |
7 | * | |
8 | * This program is distributed in the hope it will be useful, but WITHOUT | |
9 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
10 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for | |
11 | * more details. | |
12 | * | |
13 | * You should have received a copy of the GNU General Public License along with | |
14 | * this program; if not, write to the Free Software Foundation, Inc., 59 Temple | |
15 | * Place - Suite 330, Boston, MA 02111-1307 USA. | |
16 | * | |
17 | * Authors: | |
18 | * Haiyang Zhang <haiyangz@microsoft.com> | |
19 | * Hank Janssen <hjanssen@microsoft.com> | |
b0069f43 | 20 | * K. Y. Srinivasan <kys@microsoft.com> |
52e5c1ce | 21 | * |
3e7ee490 | 22 | */ |
0a46618d HJ |
23 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
24 | ||
3e7ee490 HJ |
25 | #include <linux/init.h> |
26 | #include <linux/module.h> | |
27 | #include <linux/device.h> | |
28 | #include <linux/irq.h> | |
29 | #include <linux/interrupt.h> | |
30 | #include <linux/sysctl.h> | |
5a0e3ad6 | 31 | #include <linux/slab.h> |
b0069f43 S |
32 | #include <linux/acpi.h> |
33 | #include <acpi/acpi_bus.h> | |
8b5d6d3b | 34 | #include <linux/completion.h> |
46a97191 | 35 | #include <linux/hyperv.h> |
b0209501 | 36 | #include <linux/kernel_stat.h> |
407dd164 | 37 | #include <asm/hyperv.h> |
1f94ea81 | 38 | #include <asm/hypervisor.h> |
302a3c0f | 39 | #include <asm/mshyperv.h> |
0f2a6619 | 40 | #include "hyperv_vmbus.h" |
3e7ee490 | 41 | |
3e7ee490 | 42 | |
607c1a11 | 43 | static struct acpi_device *hv_acpi_dev; |
1168ac22 | 44 | |
59c0e4f0 | 45 | static struct tasklet_struct msg_dpc; |
71a6655d | 46 | static struct completion probe_event; |
b0069f43 | 47 | static int irq; |
98db4335 | 48 | |
15b80d64 GKH |
49 | struct hv_device_info { |
50 | u32 chn_id; | |
51 | u32 chn_state; | |
52 | uuid_le chn_type; | |
53 | uuid_le chn_instance; | |
54 | ||
55 | u32 monitor_id; | |
56 | u32 server_monitor_pending; | |
57 | u32 server_monitor_latency; | |
58 | u32 server_monitor_conn_id; | |
59 | u32 client_monitor_pending; | |
60 | u32 client_monitor_latency; | |
61 | u32 client_monitor_conn_id; | |
62 | ||
63 | struct hv_dev_port_info inbound; | |
64 | struct hv_dev_port_info outbound; | |
65 | }; | |
66 | ||
cf6a2eac S |
67 | static int vmbus_exists(void) |
68 | { | |
69 | if (hv_acpi_dev == NULL) | |
70 | return -ENODEV; | |
71 | ||
72 | return 0; | |
73 | } | |
74 | ||
15b80d64 | 75 | |
98db4335 S |
76 | static void get_channel_info(struct hv_device *device, |
77 | struct hv_device_info *info) | |
78 | { | |
79 | struct vmbus_channel_debug_info debug_info; | |
80 | ||
81 | if (!device->channel) | |
82 | return; | |
83 | ||
84 | vmbus_get_debug_info(device->channel, &debug_info); | |
85 | ||
86 | info->chn_id = debug_info.relid; | |
87 | info->chn_state = debug_info.state; | |
88 | memcpy(&info->chn_type, &debug_info.interfacetype, | |
358d2ee2 | 89 | sizeof(uuid_le)); |
98db4335 | 90 | memcpy(&info->chn_instance, &debug_info.interface_instance, |
358d2ee2 | 91 | sizeof(uuid_le)); |
98db4335 S |
92 | |
93 | info->monitor_id = debug_info.monitorid; | |
94 | ||
95 | info->server_monitor_pending = debug_info.servermonitor_pending; | |
96 | info->server_monitor_latency = debug_info.servermonitor_latency; | |
97 | info->server_monitor_conn_id = debug_info.servermonitor_connectionid; | |
98 | ||
99 | info->client_monitor_pending = debug_info.clientmonitor_pending; | |
100 | info->client_monitor_latency = debug_info.clientmonitor_latency; | |
101 | info->client_monitor_conn_id = debug_info.clientmonitor_connectionid; | |
102 | ||
103 | info->inbound.int_mask = debug_info.inbound.current_interrupt_mask; | |
104 | info->inbound.read_idx = debug_info.inbound.current_read_index; | |
105 | info->inbound.write_idx = debug_info.inbound.current_write_index; | |
106 | info->inbound.bytes_avail_toread = | |
107 | debug_info.inbound.bytes_avail_toread; | |
108 | info->inbound.bytes_avail_towrite = | |
109 | debug_info.inbound.bytes_avail_towrite; | |
3e7ee490 | 110 | |
98db4335 S |
111 | info->outbound.int_mask = |
112 | debug_info.outbound.current_interrupt_mask; | |
113 | info->outbound.read_idx = debug_info.outbound.current_read_index; | |
114 | info->outbound.write_idx = debug_info.outbound.current_write_index; | |
115 | info->outbound.bytes_avail_toread = | |
116 | debug_info.outbound.bytes_avail_toread; | |
117 | info->outbound.bytes_avail_towrite = | |
118 | debug_info.outbound.bytes_avail_towrite; | |
119 | } | |
3e7ee490 | 120 | |
fd776ba9 OH |
121 | #define VMBUS_ALIAS_LEN ((sizeof((struct hv_vmbus_device_id *)0)->guid) * 2) |
122 | static void print_alias_name(struct hv_device *hv_dev, char *alias_name) | |
123 | { | |
124 | int i; | |
125 | for (i = 0; i < VMBUS_ALIAS_LEN; i += 2) | |
126 | sprintf(&alias_name[i], "%02x", hv_dev->dev_type.b[i/2]); | |
127 | } | |
128 | ||
98db4335 S |
129 | /* |
130 | * vmbus_show_device_attr - Show the device attribute in sysfs. | |
131 | * | |
132 | * This is invoked when user does a | |
133 | * "cat /sys/bus/vmbus/devices/<busdevice>/<attr name>" | |
134 | */ | |
90c9960e GKH |
135 | static ssize_t vmbus_show_device_attr(struct device *dev, |
136 | struct device_attribute *dev_attr, | |
98db4335 S |
137 | char *buf) |
138 | { | |
e8e27047 | 139 | struct hv_device *hv_dev = device_to_hv_device(dev); |
7bb52384 | 140 | struct hv_device_info *device_info; |
fd776ba9 | 141 | char alias_name[VMBUS_ALIAS_LEN + 1]; |
7bb52384 | 142 | int ret = 0; |
3e7ee490 | 143 | |
7bb52384 S |
144 | device_info = kzalloc(sizeof(struct hv_device_info), GFP_KERNEL); |
145 | if (!device_info) | |
146 | return ret; | |
3e7ee490 | 147 | |
7bb52384 | 148 | get_channel_info(hv_dev, device_info); |
3e7ee490 | 149 | |
98db4335 | 150 | if (!strcmp(dev_attr->attr.name, "class_id")) { |
2221f6ef | 151 | ret = sprintf(buf, "{%pUl}\n", device_info->chn_type.b); |
98db4335 | 152 | } else if (!strcmp(dev_attr->attr.name, "device_id")) { |
2221f6ef | 153 | ret = sprintf(buf, "{%pUl}\n", device_info->chn_instance.b); |
fd776ba9 OH |
154 | } else if (!strcmp(dev_attr->attr.name, "modalias")) { |
155 | print_alias_name(hv_dev, alias_name); | |
7bb52384 | 156 | ret = sprintf(buf, "vmbus:%s\n", alias_name); |
98db4335 | 157 | } else if (!strcmp(dev_attr->attr.name, "state")) { |
7bb52384 | 158 | ret = sprintf(buf, "%d\n", device_info->chn_state); |
98db4335 | 159 | } else if (!strcmp(dev_attr->attr.name, "id")) { |
7bb52384 | 160 | ret = sprintf(buf, "%d\n", device_info->chn_id); |
98db4335 | 161 | } else if (!strcmp(dev_attr->attr.name, "out_intr_mask")) { |
7bb52384 | 162 | ret = sprintf(buf, "%d\n", device_info->outbound.int_mask); |
98db4335 | 163 | } else if (!strcmp(dev_attr->attr.name, "out_read_index")) { |
7bb52384 | 164 | ret = sprintf(buf, "%d\n", device_info->outbound.read_idx); |
98db4335 | 165 | } else if (!strcmp(dev_attr->attr.name, "out_write_index")) { |
7bb52384 | 166 | ret = sprintf(buf, "%d\n", device_info->outbound.write_idx); |
98db4335 | 167 | } else if (!strcmp(dev_attr->attr.name, "out_read_bytes_avail")) { |
7bb52384 S |
168 | ret = sprintf(buf, "%d\n", |
169 | device_info->outbound.bytes_avail_toread); | |
98db4335 | 170 | } else if (!strcmp(dev_attr->attr.name, "out_write_bytes_avail")) { |
7bb52384 S |
171 | ret = sprintf(buf, "%d\n", |
172 | device_info->outbound.bytes_avail_towrite); | |
98db4335 | 173 | } else if (!strcmp(dev_attr->attr.name, "in_intr_mask")) { |
7bb52384 | 174 | ret = sprintf(buf, "%d\n", device_info->inbound.int_mask); |
98db4335 | 175 | } else if (!strcmp(dev_attr->attr.name, "in_read_index")) { |
7bb52384 | 176 | ret = sprintf(buf, "%d\n", device_info->inbound.read_idx); |
98db4335 | 177 | } else if (!strcmp(dev_attr->attr.name, "in_write_index")) { |
7bb52384 | 178 | ret = sprintf(buf, "%d\n", device_info->inbound.write_idx); |
98db4335 | 179 | } else if (!strcmp(dev_attr->attr.name, "in_read_bytes_avail")) { |
7bb52384 S |
180 | ret = sprintf(buf, "%d\n", |
181 | device_info->inbound.bytes_avail_toread); | |
98db4335 | 182 | } else if (!strcmp(dev_attr->attr.name, "in_write_bytes_avail")) { |
7bb52384 S |
183 | ret = sprintf(buf, "%d\n", |
184 | device_info->inbound.bytes_avail_towrite); | |
98db4335 | 185 | } else if (!strcmp(dev_attr->attr.name, "monitor_id")) { |
7bb52384 | 186 | ret = sprintf(buf, "%d\n", device_info->monitor_id); |
98db4335 | 187 | } else if (!strcmp(dev_attr->attr.name, "server_monitor_pending")) { |
7bb52384 | 188 | ret = sprintf(buf, "%d\n", device_info->server_monitor_pending); |
98db4335 | 189 | } else if (!strcmp(dev_attr->attr.name, "server_monitor_latency")) { |
7bb52384 | 190 | ret = sprintf(buf, "%d\n", device_info->server_monitor_latency); |
98db4335 | 191 | } else if (!strcmp(dev_attr->attr.name, "server_monitor_conn_id")) { |
7bb52384 S |
192 | ret = sprintf(buf, "%d\n", |
193 | device_info->server_monitor_conn_id); | |
98db4335 | 194 | } else if (!strcmp(dev_attr->attr.name, "client_monitor_pending")) { |
7bb52384 | 195 | ret = sprintf(buf, "%d\n", device_info->client_monitor_pending); |
98db4335 | 196 | } else if (!strcmp(dev_attr->attr.name, "client_monitor_latency")) { |
7bb52384 | 197 | ret = sprintf(buf, "%d\n", device_info->client_monitor_latency); |
98db4335 | 198 | } else if (!strcmp(dev_attr->attr.name, "client_monitor_conn_id")) { |
7bb52384 S |
199 | ret = sprintf(buf, "%d\n", |
200 | device_info->client_monitor_conn_id); | |
98db4335 | 201 | } |
7bb52384 S |
202 | |
203 | kfree(device_info); | |
204 | return ret; | |
98db4335 | 205 | } |
3e7ee490 | 206 | |
454f18a9 | 207 | /* Set up per device attributes in /sys/bus/vmbus/devices/<bus device> */ |
3e7ee490 HJ |
208 | static struct device_attribute vmbus_device_attrs[] = { |
209 | __ATTR(id, S_IRUGO, vmbus_show_device_attr, NULL), | |
210 | __ATTR(state, S_IRUGO, vmbus_show_device_attr, NULL), | |
211 | __ATTR(class_id, S_IRUGO, vmbus_show_device_attr, NULL), | |
212 | __ATTR(device_id, S_IRUGO, vmbus_show_device_attr, NULL), | |
213 | __ATTR(monitor_id, S_IRUGO, vmbus_show_device_attr, NULL), | |
fd776ba9 | 214 | __ATTR(modalias, S_IRUGO, vmbus_show_device_attr, NULL), |
3e7ee490 HJ |
215 | |
216 | __ATTR(server_monitor_pending, S_IRUGO, vmbus_show_device_attr, NULL), | |
217 | __ATTR(server_monitor_latency, S_IRUGO, vmbus_show_device_attr, NULL), | |
218 | __ATTR(server_monitor_conn_id, S_IRUGO, vmbus_show_device_attr, NULL), | |
219 | ||
220 | __ATTR(client_monitor_pending, S_IRUGO, vmbus_show_device_attr, NULL), | |
221 | __ATTR(client_monitor_latency, S_IRUGO, vmbus_show_device_attr, NULL), | |
222 | __ATTR(client_monitor_conn_id, S_IRUGO, vmbus_show_device_attr, NULL), | |
223 | ||
224 | __ATTR(out_intr_mask, S_IRUGO, vmbus_show_device_attr, NULL), | |
225 | __ATTR(out_read_index, S_IRUGO, vmbus_show_device_attr, NULL), | |
226 | __ATTR(out_write_index, S_IRUGO, vmbus_show_device_attr, NULL), | |
227 | __ATTR(out_read_bytes_avail, S_IRUGO, vmbus_show_device_attr, NULL), | |
228 | __ATTR(out_write_bytes_avail, S_IRUGO, vmbus_show_device_attr, NULL), | |
229 | ||
230 | __ATTR(in_intr_mask, S_IRUGO, vmbus_show_device_attr, NULL), | |
231 | __ATTR(in_read_index, S_IRUGO, vmbus_show_device_attr, NULL), | |
232 | __ATTR(in_write_index, S_IRUGO, vmbus_show_device_attr, NULL), | |
233 | __ATTR(in_read_bytes_avail, S_IRUGO, vmbus_show_device_attr, NULL), | |
234 | __ATTR(in_write_bytes_avail, S_IRUGO, vmbus_show_device_attr, NULL), | |
235 | __ATTR_NULL | |
236 | }; | |
3e7ee490 | 237 | |
793be9c7 | 238 | |
adde2487 S |
239 | /* |
240 | * vmbus_uevent - add uevent for our device | |
241 | * | |
242 | * This routine is invoked when a device is added or removed on the vmbus to | |
243 | * generate a uevent to udev in the userspace. The udev will then look at its | |
244 | * rule and the uevent generated here to load the appropriate driver | |
0ddda660 S |
245 | * |
246 | * The alias string will be of the form vmbus:guid where guid is the string | |
247 | * representation of the device guid (each byte of the guid will be | |
248 | * represented with two hex characters. | |
adde2487 S |
249 | */ |
250 | static int vmbus_uevent(struct device *device, struct kobj_uevent_env *env) | |
251 | { | |
252 | struct hv_device *dev = device_to_hv_device(device); | |
fd776ba9 OH |
253 | int ret; |
254 | char alias_name[VMBUS_ALIAS_LEN + 1]; | |
0ddda660 | 255 | |
fd776ba9 | 256 | print_alias_name(dev, alias_name); |
0ddda660 S |
257 | ret = add_uevent_var(env, "MODALIAS=vmbus:%s", alias_name); |
258 | return ret; | |
adde2487 S |
259 | } |
260 | ||
5841a829 S |
261 | static uuid_le null_guid; |
262 | ||
263 | static inline bool is_null_guid(const __u8 *guid) | |
264 | { | |
265 | if (memcmp(guid, &null_guid, sizeof(uuid_le))) | |
266 | return false; | |
267 | return true; | |
268 | } | |
269 | ||
3037a7b6 S |
270 | /* |
271 | * Return a matching hv_vmbus_device_id pointer. | |
272 | * If there is no match, return NULL. | |
273 | */ | |
274 | static const struct hv_vmbus_device_id *hv_vmbus_get_id( | |
275 | const struct hv_vmbus_device_id *id, | |
276 | __u8 *guid) | |
277 | { | |
278 | for (; !is_null_guid(id->guid); id++) | |
279 | if (!memcmp(&id->guid, guid, sizeof(uuid_le))) | |
280 | return id; | |
281 | ||
282 | return NULL; | |
283 | } | |
284 | ||
285 | ||
b7fc147b S |
286 | |
287 | /* | |
288 | * vmbus_match - Attempt to match the specified device to the specified driver | |
289 | */ | |
290 | static int vmbus_match(struct device *device, struct device_driver *driver) | |
291 | { | |
b7fc147b | 292 | struct hv_driver *drv = drv_to_hv_drv(driver); |
e8e27047 | 293 | struct hv_device *hv_dev = device_to_hv_device(device); |
b7fc147b | 294 | |
3037a7b6 S |
295 | if (hv_vmbus_get_id(drv->id_table, hv_dev->dev_type.b)) |
296 | return 1; | |
de632a2b | 297 | |
5841a829 | 298 | return 0; |
b7fc147b S |
299 | } |
300 | ||
f1f0d67b S |
301 | /* |
302 | * vmbus_probe - Add the new vmbus's child device | |
303 | */ | |
304 | static int vmbus_probe(struct device *child_device) | |
305 | { | |
306 | int ret = 0; | |
307 | struct hv_driver *drv = | |
308 | drv_to_hv_drv(child_device->driver); | |
9efd21e1 | 309 | struct hv_device *dev = device_to_hv_device(child_device); |
84946899 | 310 | const struct hv_vmbus_device_id *dev_id; |
f1f0d67b | 311 | |
84946899 | 312 | dev_id = hv_vmbus_get_id(drv->id_table, dev->dev_type.b); |
9efd21e1 | 313 | if (drv->probe) { |
84946899 | 314 | ret = drv->probe(dev, dev_id); |
b14a7b30 | 315 | if (ret != 0) |
0a46618d HJ |
316 | pr_err("probe failed for device %s (%d)\n", |
317 | dev_name(child_device), ret); | |
f1f0d67b | 318 | |
f1f0d67b | 319 | } else { |
0a46618d HJ |
320 | pr_err("probe not set for driver %s\n", |
321 | dev_name(child_device)); | |
6de925b1 | 322 | ret = -ENODEV; |
f1f0d67b S |
323 | } |
324 | return ret; | |
325 | } | |
326 | ||
c5dce3db S |
327 | /* |
328 | * vmbus_remove - Remove a vmbus device | |
329 | */ | |
330 | static int vmbus_remove(struct device *child_device) | |
331 | { | |
d4372179 | 332 | struct hv_driver *drv = drv_to_hv_drv(child_device->driver); |
415b023a | 333 | struct hv_device *dev = device_to_hv_device(child_device); |
c5dce3db | 334 | |
d4372179 S |
335 | if (drv->remove) |
336 | drv->remove(dev); | |
337 | else | |
338 | pr_err("remove not set for driver %s\n", | |
339 | dev_name(child_device)); | |
c5dce3db S |
340 | |
341 | return 0; | |
342 | } | |
343 | ||
eb1bb259 S |
344 | |
345 | /* | |
346 | * vmbus_shutdown - Shutdown a vmbus device | |
347 | */ | |
348 | static void vmbus_shutdown(struct device *child_device) | |
349 | { | |
350 | struct hv_driver *drv; | |
ca6887fb | 351 | struct hv_device *dev = device_to_hv_device(child_device); |
eb1bb259 S |
352 | |
353 | ||
354 | /* The device may not be attached yet */ | |
355 | if (!child_device->driver) | |
356 | return; | |
357 | ||
358 | drv = drv_to_hv_drv(child_device->driver); | |
359 | ||
ca6887fb S |
360 | if (drv->shutdown) |
361 | drv->shutdown(dev); | |
eb1bb259 S |
362 | |
363 | return; | |
364 | } | |
365 | ||
086e7a56 S |
366 | |
367 | /* | |
368 | * vmbus_device_release - Final callback release of the vmbus child device | |
369 | */ | |
370 | static void vmbus_device_release(struct device *device) | |
371 | { | |
e8e27047 | 372 | struct hv_device *hv_dev = device_to_hv_device(device); |
086e7a56 | 373 | |
e8e27047 | 374 | kfree(hv_dev); |
086e7a56 S |
375 | |
376 | } | |
377 | ||
454f18a9 | 378 | /* The one and only one */ |
9adcac5c S |
379 | static struct bus_type hv_bus = { |
380 | .name = "vmbus", | |
381 | .match = vmbus_match, | |
382 | .shutdown = vmbus_shutdown, | |
383 | .remove = vmbus_remove, | |
384 | .probe = vmbus_probe, | |
385 | .uevent = vmbus_uevent, | |
386 | .dev_attrs = vmbus_device_attrs, | |
3e7ee490 HJ |
387 | }; |
388 | ||
adf874cb | 389 | static const char *driver_name = "hyperv"; |
36199a99 | 390 | |
36199a99 | 391 | |
bf6506f6 TT |
392 | struct onmessage_work_context { |
393 | struct work_struct work; | |
394 | struct hv_message msg; | |
395 | }; | |
396 | ||
397 | static void vmbus_onmessage_work(struct work_struct *work) | |
398 | { | |
399 | struct onmessage_work_context *ctx; | |
400 | ||
401 | ctx = container_of(work, struct onmessage_work_context, | |
402 | work); | |
403 | vmbus_onmessage(&ctx->msg); | |
404 | kfree(ctx); | |
405 | } | |
406 | ||
62c1059d | 407 | static void vmbus_on_msg_dpc(unsigned long data) |
36199a99 GKH |
408 | { |
409 | int cpu = smp_processor_id(); | |
410 | void *page_addr = hv_context.synic_message_page[cpu]; | |
411 | struct hv_message *msg = (struct hv_message *)page_addr + | |
412 | VMBUS_MESSAGE_SINT; | |
bf6506f6 | 413 | struct onmessage_work_context *ctx; |
36199a99 GKH |
414 | |
415 | while (1) { | |
416 | if (msg->header.message_type == HVMSG_NONE) { | |
417 | /* no msg */ | |
418 | break; | |
419 | } else { | |
bf6506f6 TT |
420 | ctx = kmalloc(sizeof(*ctx), GFP_ATOMIC); |
421 | if (ctx == NULL) | |
36199a99 | 422 | continue; |
bf6506f6 TT |
423 | INIT_WORK(&ctx->work, vmbus_onmessage_work); |
424 | memcpy(&ctx->msg, msg, sizeof(*msg)); | |
da9fcb72 | 425 | queue_work(vmbus_connection.work_queue, &ctx->work); |
36199a99 GKH |
426 | } |
427 | ||
428 | msg->header.message_type = HVMSG_NONE; | |
429 | ||
430 | /* | |
431 | * Make sure the write to MessageType (ie set to | |
432 | * HVMSG_NONE) happens before we read the | |
433 | * MessagePending and EOMing. Otherwise, the EOMing | |
434 | * will not deliver any more messages since there is | |
435 | * no empty slot | |
436 | */ | |
35848f68 | 437 | mb(); |
36199a99 GKH |
438 | |
439 | if (msg->header.message_flags.msg_pending) { | |
440 | /* | |
441 | * This will cause message queue rescan to | |
442 | * possibly deliver another msg from the | |
443 | * hypervisor | |
444 | */ | |
445 | wrmsrl(HV_X64_MSR_EOM, 0); | |
446 | } | |
447 | } | |
448 | } | |
449 | ||
ae4636e6 | 450 | static irqreturn_t vmbus_isr(int irq, void *dev_id) |
36199a99 | 451 | { |
36199a99 GKH |
452 | int cpu = smp_processor_id(); |
453 | void *page_addr; | |
454 | struct hv_message *msg; | |
455 | union hv_synic_event_flags *event; | |
ae4636e6 | 456 | bool handled = false; |
36199a99 | 457 | |
5ab05951 S |
458 | page_addr = hv_context.synic_event_page[cpu]; |
459 | if (page_addr == NULL) | |
460 | return IRQ_NONE; | |
461 | ||
462 | event = (union hv_synic_event_flags *)page_addr + | |
463 | VMBUS_MESSAGE_SINT; | |
7341d908 S |
464 | /* |
465 | * Check for events before checking for messages. This is the order | |
466 | * in which events and messages are checked in Windows guests on | |
467 | * Hyper-V, and the Windows team suggested we do the same. | |
468 | */ | |
36199a99 | 469 | |
6552ecd7 S |
470 | if ((vmbus_proto_version == VERSION_WS2008) || |
471 | (vmbus_proto_version == VERSION_WIN7)) { | |
36199a99 | 472 | |
6552ecd7 S |
473 | /* Since we are a child, we only need to check bit 0 */ |
474 | if (sync_test_and_clear_bit(0, | |
475 | (unsigned long *) &event->flags32[0])) { | |
476 | handled = true; | |
477 | } | |
478 | } else { | |
479 | /* | |
480 | * Our host is win8 or above. The signaling mechanism | |
481 | * has changed and we can directly look at the event page. | |
482 | * If bit n is set then we have an interrup on the channel | |
483 | * whose id is n. | |
484 | */ | |
ae4636e6 | 485 | handled = true; |
ae4636e6 | 486 | } |
793be9c7 | 487 | |
6552ecd7 | 488 | if (handled) |
db11f12a | 489 | tasklet_schedule(hv_context.event_dpc[cpu]); |
6552ecd7 S |
490 | |
491 | ||
7341d908 S |
492 | page_addr = hv_context.synic_message_page[cpu]; |
493 | msg = (struct hv_message *)page_addr + VMBUS_MESSAGE_SINT; | |
494 | ||
495 | /* Check if there are actual msgs to be processed */ | |
496 | if (msg->header.message_type != HVMSG_NONE) { | |
497 | handled = true; | |
498 | tasklet_schedule(&msg_dpc); | |
499 | } | |
500 | ||
ae4636e6 | 501 | if (handled) |
793be9c7 | 502 | return IRQ_HANDLED; |
ae4636e6 | 503 | else |
793be9c7 | 504 | return IRQ_NONE; |
793be9c7 S |
505 | } |
506 | ||
b0209501 S |
507 | /* |
508 | * vmbus interrupt flow handler: | |
509 | * vmbus interrupts can concurrently occur on multiple CPUs and | |
510 | * can be handled concurrently. | |
511 | */ | |
512 | ||
83ebf6e5 | 513 | static void vmbus_flow_handler(unsigned int irq, struct irq_desc *desc) |
b0209501 S |
514 | { |
515 | kstat_incr_irqs_this_cpu(irq, desc); | |
516 | ||
517 | desc->action->handler(irq, desc->action->dev_id); | |
518 | } | |
519 | ||
3e189519 | 520 | /* |
90c9960e GKH |
521 | * vmbus_bus_init -Main vmbus driver initialization routine. |
522 | * | |
523 | * Here, we | |
0686e4f4 | 524 | * - initialize the vmbus driver context |
0686e4f4 LL |
525 | * - invoke the vmbus hv main init routine |
526 | * - get the irq resource | |
0686e4f4 | 527 | * - retrieve the channel offers |
90c9960e | 528 | */ |
9aaa995e | 529 | static int vmbus_bus_init(int irq) |
3e7ee490 | 530 | { |
90c9960e | 531 | int ret; |
3e7ee490 | 532 | |
6d26e38f GKH |
533 | /* Hypervisor initialization...setup hypercall page..etc */ |
534 | ret = hv_init(); | |
90c9960e | 535 | if (ret != 0) { |
0a46618d | 536 | pr_err("Unable to initialize the hypervisor - 0x%x\n", ret); |
d6c1c5de | 537 | return ret; |
3e7ee490 HJ |
538 | } |
539 | ||
59c0e4f0 | 540 | tasklet_init(&msg_dpc, vmbus_on_msg_dpc, 0); |
3e7ee490 | 541 | |
9adcac5c | 542 | ret = bus_register(&hv_bus); |
d6c1c5de | 543 | if (ret) |
8b9987e9 | 544 | goto err_cleanup; |
3e7ee490 | 545 | |
20ed3ef7 | 546 | ret = request_irq(irq, vmbus_isr, 0, driver_name, hv_acpi_dev); |
3e7ee490 | 547 | |
90c9960e | 548 | if (ret != 0) { |
0a46618d | 549 | pr_err("Unable to request IRQ %d\n", |
9aaa995e | 550 | irq); |
8b9987e9 | 551 | goto err_unregister; |
3e7ee490 | 552 | } |
3e7ee490 | 553 | |
b0209501 S |
554 | /* |
555 | * Vmbus interrupts can be handled concurrently on | |
556 | * different CPUs. Establish an appropriate interrupt flow | |
557 | * handler that can support this model. | |
558 | */ | |
559 | irq_set_handler(irq, vmbus_flow_handler); | |
560 | ||
302a3c0f S |
561 | /* |
562 | * Register our interrupt handler. | |
563 | */ | |
564 | hv_register_vmbus_handler(irq, vmbus_isr); | |
3e7ee490 | 565 | |
2608fb65 JW |
566 | ret = hv_synic_alloc(); |
567 | if (ret) | |
568 | goto err_alloc; | |
800b6902 | 569 | /* |
302a3c0f | 570 | * Initialize the per-cpu interrupt state and |
800b6902 S |
571 | * connect to the host. |
572 | */ | |
302a3c0f | 573 | on_each_cpu(hv_synic_init, NULL, 1); |
800b6902 | 574 | ret = vmbus_connect(); |
8b9987e9 | 575 | if (ret) |
2608fb65 | 576 | goto err_alloc; |
800b6902 | 577 | |
2d6e882b | 578 | vmbus_request_offers(); |
8b5d6d3b | 579 | |
d6c1c5de | 580 | return 0; |
8b9987e9 | 581 | |
2608fb65 JW |
582 | err_alloc: |
583 | hv_synic_free(); | |
8b9987e9 S |
584 | free_irq(irq, hv_acpi_dev); |
585 | ||
586 | err_unregister: | |
587 | bus_unregister(&hv_bus); | |
588 | ||
589 | err_cleanup: | |
590 | hv_cleanup(); | |
591 | ||
592 | return ret; | |
3e7ee490 HJ |
593 | } |
594 | ||
90c9960e | 595 | /** |
768fa219 GKH |
596 | * __vmbus_child_driver_register - Register a vmbus's driver |
597 | * @drv: Pointer to driver structure you want to register | |
598 | * @owner: owner module of the drv | |
599 | * @mod_name: module name string | |
3e189519 HJ |
600 | * |
601 | * Registers the given driver with Linux through the 'driver_register()' call | |
768fa219 | 602 | * and sets up the hyper-v vmbus handling for this driver. |
3e189519 HJ |
603 | * It will return the state of the 'driver_register()' call. |
604 | * | |
90c9960e | 605 | */ |
768fa219 | 606 | int __vmbus_driver_register(struct hv_driver *hv_driver, struct module *owner, const char *mod_name) |
3e7ee490 | 607 | { |
5d48a1c2 | 608 | int ret; |
3e7ee490 | 609 | |
768fa219 | 610 | pr_info("registering driver %s\n", hv_driver->name); |
3e7ee490 | 611 | |
cf6a2eac S |
612 | ret = vmbus_exists(); |
613 | if (ret < 0) | |
614 | return ret; | |
615 | ||
768fa219 GKH |
616 | hv_driver->driver.name = hv_driver->name; |
617 | hv_driver->driver.owner = owner; | |
618 | hv_driver->driver.mod_name = mod_name; | |
619 | hv_driver->driver.bus = &hv_bus; | |
3e7ee490 | 620 | |
768fa219 | 621 | ret = driver_register(&hv_driver->driver); |
3e7ee490 | 622 | |
5d48a1c2 | 623 | return ret; |
3e7ee490 | 624 | } |
768fa219 | 625 | EXPORT_SYMBOL_GPL(__vmbus_driver_register); |
3e7ee490 | 626 | |
90c9960e | 627 | /** |
768fa219 GKH |
628 | * vmbus_driver_unregister() - Unregister a vmbus's driver |
629 | * @drv: Pointer to driver structure you want to un-register | |
3e189519 | 630 | * |
768fa219 GKH |
631 | * Un-register the given driver that was previous registered with a call to |
632 | * vmbus_driver_register() | |
90c9960e | 633 | */ |
768fa219 | 634 | void vmbus_driver_unregister(struct hv_driver *hv_driver) |
3e7ee490 | 635 | { |
768fa219 | 636 | pr_info("unregistering driver %s\n", hv_driver->name); |
3e7ee490 | 637 | |
cf6a2eac | 638 | if (!vmbus_exists()) |
8f257a14 | 639 | driver_unregister(&hv_driver->driver); |
3e7ee490 | 640 | } |
768fa219 | 641 | EXPORT_SYMBOL_GPL(vmbus_driver_unregister); |
3e7ee490 | 642 | |
3e189519 | 643 | /* |
f2c73011 | 644 | * vmbus_device_create - Creates and registers a new child device |
3e189519 | 645 | * on the vmbus. |
90c9960e | 646 | */ |
f2c73011 | 647 | struct hv_device *vmbus_device_create(uuid_le *type, |
358d2ee2 | 648 | uuid_le *instance, |
89733aa9 | 649 | struct vmbus_channel *channel) |
3e7ee490 | 650 | { |
3d3b5518 | 651 | struct hv_device *child_device_obj; |
3e7ee490 | 652 | |
6bad88da S |
653 | child_device_obj = kzalloc(sizeof(struct hv_device), GFP_KERNEL); |
654 | if (!child_device_obj) { | |
0a46618d | 655 | pr_err("Unable to allocate device object for child device\n"); |
3e7ee490 HJ |
656 | return NULL; |
657 | } | |
658 | ||
cae5b843 | 659 | child_device_obj->channel = channel; |
358d2ee2 | 660 | memcpy(&child_device_obj->dev_type, type, sizeof(uuid_le)); |
ca623ad3 | 661 | memcpy(&child_device_obj->dev_instance, instance, |
358d2ee2 | 662 | sizeof(uuid_le)); |
3e7ee490 | 663 | |
3e7ee490 | 664 | |
3e7ee490 HJ |
665 | return child_device_obj; |
666 | } | |
667 | ||
3e189519 | 668 | /* |
22794281 | 669 | * vmbus_device_register - Register the child device |
90c9960e | 670 | */ |
22794281 | 671 | int vmbus_device_register(struct hv_device *child_device_obj) |
3e7ee490 | 672 | { |
90c9960e | 673 | int ret = 0; |
6bad88da | 674 | |
f4888417 | 675 | static atomic_t device_num = ATOMIC_INIT(0); |
3e7ee490 | 676 | |
6bad88da | 677 | dev_set_name(&child_device_obj->device, "vmbus_0_%d", |
90c9960e | 678 | atomic_inc_return(&device_num)); |
3e7ee490 | 679 | |
0bce28b6 | 680 | child_device_obj->device.bus = &hv_bus; |
607c1a11 | 681 | child_device_obj->device.parent = &hv_acpi_dev->dev; |
6bad88da | 682 | child_device_obj->device.release = vmbus_device_release; |
3e7ee490 | 683 | |
90c9960e GKH |
684 | /* |
685 | * Register with the LDM. This will kick off the driver/device | |
686 | * binding...which will eventually call vmbus_match() and vmbus_probe() | |
687 | */ | |
6bad88da | 688 | ret = device_register(&child_device_obj->device); |
3e7ee490 | 689 | |
3e7ee490 | 690 | if (ret) |
0a46618d | 691 | pr_err("Unable to register child device\n"); |
3e7ee490 | 692 | else |
0a46618d HJ |
693 | pr_info("child device %s registered\n", |
694 | dev_name(&child_device_obj->device)); | |
3e7ee490 | 695 | |
3e7ee490 HJ |
696 | return ret; |
697 | } | |
698 | ||
3e189519 | 699 | /* |
696453ba | 700 | * vmbus_device_unregister - Remove the specified child device |
3e189519 | 701 | * from the vmbus. |
90c9960e | 702 | */ |
696453ba | 703 | void vmbus_device_unregister(struct hv_device *device_obj) |
3e7ee490 | 704 | { |
90c9960e GKH |
705 | /* |
706 | * Kick off the process of unregistering the device. | |
707 | * This will call vmbus_remove() and eventually vmbus_device_release() | |
708 | */ | |
6bad88da | 709 | device_unregister(&device_obj->device); |
3e7ee490 | 710 | |
0a46618d HJ |
711 | pr_info("child device %s unregistered\n", |
712 | dev_name(&device_obj->device)); | |
3e7ee490 HJ |
713 | } |
714 | ||
3e7ee490 | 715 | |
b0069f43 S |
716 | /* |
717 | * VMBUS is an acpi enumerated device. Get the the IRQ information | |
718 | * from DSDT. | |
719 | */ | |
720 | ||
721 | static acpi_status vmbus_walk_resources(struct acpi_resource *res, void *irq) | |
722 | { | |
723 | ||
724 | if (res->type == ACPI_RESOURCE_TYPE_IRQ) { | |
725 | struct acpi_resource_irq *irqp; | |
726 | irqp = &res->data.irq; | |
727 | ||
728 | *((unsigned int *)irq) = irqp->interrupts[0]; | |
729 | } | |
730 | ||
731 | return AE_OK; | |
732 | } | |
733 | ||
734 | static int vmbus_acpi_add(struct acpi_device *device) | |
735 | { | |
736 | acpi_status result; | |
737 | ||
607c1a11 S |
738 | hv_acpi_dev = device; |
739 | ||
0a4425b6 S |
740 | result = acpi_walk_resources(device->handle, METHOD_NAME__CRS, |
741 | vmbus_walk_resources, &irq); | |
b0069f43 S |
742 | |
743 | if (ACPI_FAILURE(result)) { | |
744 | complete(&probe_event); | |
745 | return -ENODEV; | |
746 | } | |
747 | complete(&probe_event); | |
748 | return 0; | |
749 | } | |
750 | ||
751 | static const struct acpi_device_id vmbus_acpi_device_ids[] = { | |
752 | {"VMBUS", 0}, | |
9d7b18d1 | 753 | {"VMBus", 0}, |
b0069f43 S |
754 | {"", 0}, |
755 | }; | |
756 | MODULE_DEVICE_TABLE(acpi, vmbus_acpi_device_ids); | |
757 | ||
758 | static struct acpi_driver vmbus_acpi_driver = { | |
759 | .name = "vmbus", | |
760 | .ids = vmbus_acpi_device_ids, | |
761 | .ops = { | |
762 | .add = vmbus_acpi_add, | |
763 | }, | |
764 | }; | |
765 | ||
607c1a11 | 766 | static int __init hv_acpi_init(void) |
1168ac22 | 767 | { |
2dda95f8 | 768 | int ret, t; |
b0069f43 | 769 | |
1f94ea81 | 770 | if (x86_hyper != &x86_hyper_ms_hyperv) |
0592969e JW |
771 | return -ENODEV; |
772 | ||
b0069f43 S |
773 | init_completion(&probe_event); |
774 | ||
775 | /* | |
776 | * Get irq resources first. | |
777 | */ | |
778 | ||
0246604c S |
779 | ret = acpi_bus_register_driver(&vmbus_acpi_driver); |
780 | ||
b0069f43 S |
781 | if (ret) |
782 | return ret; | |
783 | ||
2dda95f8 S |
784 | t = wait_for_completion_timeout(&probe_event, 5*HZ); |
785 | if (t == 0) { | |
786 | ret = -ETIMEDOUT; | |
787 | goto cleanup; | |
788 | } | |
b0069f43 S |
789 | |
790 | if (irq <= 0) { | |
2dda95f8 S |
791 | ret = -ENODEV; |
792 | goto cleanup; | |
b0069f43 S |
793 | } |
794 | ||
91fd799e S |
795 | ret = vmbus_bus_init(irq); |
796 | if (ret) | |
2dda95f8 S |
797 | goto cleanup; |
798 | ||
799 | return 0; | |
800 | ||
801 | cleanup: | |
802 | acpi_bus_unregister_driver(&vmbus_acpi_driver); | |
cf6a2eac | 803 | hv_acpi_dev = NULL; |
91fd799e | 804 | return ret; |
1168ac22 S |
805 | } |
806 | ||
93e5bd06 S |
807 | static void __exit vmbus_exit(void) |
808 | { | |
809 | ||
810 | free_irq(irq, hv_acpi_dev); | |
811 | vmbus_free_channels(); | |
812 | bus_unregister(&hv_bus); | |
813 | hv_cleanup(); | |
814 | acpi_bus_unregister_driver(&vmbus_acpi_driver); | |
815 | } | |
816 | ||
1168ac22 | 817 | |
90c9960e | 818 | MODULE_LICENSE("GPL"); |
26c14cc1 | 819 | MODULE_VERSION(HV_DRV_VERSION); |
3e7ee490 | 820 | |
43d4e119 | 821 | subsys_initcall(hv_acpi_init); |
93e5bd06 | 822 | module_exit(vmbus_exit); |