]>
Commit | Line | Data |
---|---|---|
1 | /* | |
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> | |
20 | * K. Y. Srinivasan <kys@microsoft.com> | |
21 | * | |
22 | */ | |
23 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt | |
24 | ||
25 | #include <linux/init.h> | |
26 | #include <linux/module.h> | |
27 | #include <linux/device.h> | |
28 | #include <linux/interrupt.h> | |
29 | #include <linux/sysctl.h> | |
30 | #include <linux/slab.h> | |
31 | #include <linux/acpi.h> | |
32 | #include <linux/completion.h> | |
33 | #include <linux/hyperv.h> | |
34 | #include <linux/kernel_stat.h> | |
35 | #include <linux/clockchips.h> | |
36 | #include <linux/cpu.h> | |
37 | #include <asm/hyperv.h> | |
38 | #include <asm/hypervisor.h> | |
39 | #include <asm/mshyperv.h> | |
40 | #include <linux/notifier.h> | |
41 | #include <linux/ptrace.h> | |
42 | #include <linux/screen_info.h> | |
43 | #include <linux/kdebug.h> | |
44 | #include <linux/efi.h> | |
45 | #include <linux/random.h> | |
46 | #include "hyperv_vmbus.h" | |
47 | ||
48 | static struct acpi_device *hv_acpi_dev; | |
49 | ||
50 | static struct completion probe_event; | |
51 | ||
52 | ||
53 | static void hyperv_report_panic(struct pt_regs *regs) | |
54 | { | |
55 | static bool panic_reported; | |
56 | ||
57 | /* | |
58 | * We prefer to report panic on 'die' chain as we have proper | |
59 | * registers to report, but if we miss it (e.g. on BUG()) we need | |
60 | * to report it on 'panic'. | |
61 | */ | |
62 | if (panic_reported) | |
63 | return; | |
64 | panic_reported = true; | |
65 | ||
66 | wrmsrl(HV_X64_MSR_CRASH_P0, regs->ip); | |
67 | wrmsrl(HV_X64_MSR_CRASH_P1, regs->ax); | |
68 | wrmsrl(HV_X64_MSR_CRASH_P2, regs->bx); | |
69 | wrmsrl(HV_X64_MSR_CRASH_P3, regs->cx); | |
70 | wrmsrl(HV_X64_MSR_CRASH_P4, regs->dx); | |
71 | ||
72 | /* | |
73 | * Let Hyper-V know there is crash data available | |
74 | */ | |
75 | wrmsrl(HV_X64_MSR_CRASH_CTL, HV_CRASH_CTL_CRASH_NOTIFY); | |
76 | } | |
77 | ||
78 | static int hyperv_panic_event(struct notifier_block *nb, unsigned long val, | |
79 | void *args) | |
80 | { | |
81 | struct pt_regs *regs; | |
82 | ||
83 | regs = current_pt_regs(); | |
84 | ||
85 | hyperv_report_panic(regs); | |
86 | return NOTIFY_DONE; | |
87 | } | |
88 | ||
89 | static int hyperv_die_event(struct notifier_block *nb, unsigned long val, | |
90 | void *args) | |
91 | { | |
92 | struct die_args *die = (struct die_args *)args; | |
93 | struct pt_regs *regs = die->regs; | |
94 | ||
95 | hyperv_report_panic(regs); | |
96 | return NOTIFY_DONE; | |
97 | } | |
98 | ||
99 | static struct notifier_block hyperv_die_block = { | |
100 | .notifier_call = hyperv_die_event, | |
101 | }; | |
102 | static struct notifier_block hyperv_panic_block = { | |
103 | .notifier_call = hyperv_panic_event, | |
104 | }; | |
105 | ||
106 | static const char *fb_mmio_name = "fb_range"; | |
107 | static struct resource *fb_mmio; | |
108 | struct resource *hyperv_mmio; | |
109 | DEFINE_SEMAPHORE(hyperv_mmio_lock); | |
110 | ||
111 | static int vmbus_exists(void) | |
112 | { | |
113 | if (hv_acpi_dev == NULL) | |
114 | return -ENODEV; | |
115 | ||
116 | return 0; | |
117 | } | |
118 | ||
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 | ||
127 | static u8 channel_monitor_group(struct vmbus_channel *channel) | |
128 | { | |
129 | return (u8)channel->offermsg.monitorid / 32; | |
130 | } | |
131 | ||
132 | static u8 channel_monitor_offset(struct vmbus_channel *channel) | |
133 | { | |
134 | return (u8)channel->offermsg.monitorid % 32; | |
135 | } | |
136 | ||
137 | static u32 channel_pending(struct vmbus_channel *channel, | |
138 | struct hv_monitor_page *monitor_page) | |
139 | { | |
140 | u8 monitor_group = channel_monitor_group(channel); | |
141 | return monitor_page->trigger_group[monitor_group].pending; | |
142 | } | |
143 | ||
144 | static u32 channel_latency(struct vmbus_channel *channel, | |
145 | struct hv_monitor_page *monitor_page) | |
146 | { | |
147 | u8 monitor_group = channel_monitor_group(channel); | |
148 | u8 monitor_offset = channel_monitor_offset(channel); | |
149 | return monitor_page->latency[monitor_group][monitor_offset]; | |
150 | } | |
151 | ||
152 | static u32 channel_conn_id(struct vmbus_channel *channel, | |
153 | struct hv_monitor_page *monitor_page) | |
154 | { | |
155 | u8 monitor_group = channel_monitor_group(channel); | |
156 | u8 monitor_offset = channel_monitor_offset(channel); | |
157 | return monitor_page->parameter[monitor_group][monitor_offset].connectionid.u.id; | |
158 | } | |
159 | ||
160 | static ssize_t id_show(struct device *dev, struct device_attribute *dev_attr, | |
161 | char *buf) | |
162 | { | |
163 | struct hv_device *hv_dev = device_to_hv_device(dev); | |
164 | ||
165 | if (!hv_dev->channel) | |
166 | return -ENODEV; | |
167 | return sprintf(buf, "%d\n", hv_dev->channel->offermsg.child_relid); | |
168 | } | |
169 | static DEVICE_ATTR_RO(id); | |
170 | ||
171 | static ssize_t state_show(struct device *dev, struct device_attribute *dev_attr, | |
172 | char *buf) | |
173 | { | |
174 | struct hv_device *hv_dev = device_to_hv_device(dev); | |
175 | ||
176 | if (!hv_dev->channel) | |
177 | return -ENODEV; | |
178 | return sprintf(buf, "%d\n", hv_dev->channel->state); | |
179 | } | |
180 | static DEVICE_ATTR_RO(state); | |
181 | ||
182 | static ssize_t monitor_id_show(struct device *dev, | |
183 | struct device_attribute *dev_attr, char *buf) | |
184 | { | |
185 | struct hv_device *hv_dev = device_to_hv_device(dev); | |
186 | ||
187 | if (!hv_dev->channel) | |
188 | return -ENODEV; | |
189 | return sprintf(buf, "%d\n", hv_dev->channel->offermsg.monitorid); | |
190 | } | |
191 | static DEVICE_ATTR_RO(monitor_id); | |
192 | ||
193 | static ssize_t class_id_show(struct device *dev, | |
194 | struct device_attribute *dev_attr, char *buf) | |
195 | { | |
196 | struct hv_device *hv_dev = device_to_hv_device(dev); | |
197 | ||
198 | if (!hv_dev->channel) | |
199 | return -ENODEV; | |
200 | return sprintf(buf, "{%pUl}\n", | |
201 | hv_dev->channel->offermsg.offer.if_type.b); | |
202 | } | |
203 | static DEVICE_ATTR_RO(class_id); | |
204 | ||
205 | static ssize_t device_id_show(struct device *dev, | |
206 | struct device_attribute *dev_attr, char *buf) | |
207 | { | |
208 | struct hv_device *hv_dev = device_to_hv_device(dev); | |
209 | ||
210 | if (!hv_dev->channel) | |
211 | return -ENODEV; | |
212 | return sprintf(buf, "{%pUl}\n", | |
213 | hv_dev->channel->offermsg.offer.if_instance.b); | |
214 | } | |
215 | static DEVICE_ATTR_RO(device_id); | |
216 | ||
217 | static ssize_t modalias_show(struct device *dev, | |
218 | struct device_attribute *dev_attr, char *buf) | |
219 | { | |
220 | struct hv_device *hv_dev = device_to_hv_device(dev); | |
221 | char alias_name[VMBUS_ALIAS_LEN + 1]; | |
222 | ||
223 | print_alias_name(hv_dev, alias_name); | |
224 | return sprintf(buf, "vmbus:%s\n", alias_name); | |
225 | } | |
226 | static DEVICE_ATTR_RO(modalias); | |
227 | ||
228 | static ssize_t server_monitor_pending_show(struct device *dev, | |
229 | struct device_attribute *dev_attr, | |
230 | char *buf) | |
231 | { | |
232 | struct hv_device *hv_dev = device_to_hv_device(dev); | |
233 | ||
234 | if (!hv_dev->channel) | |
235 | return -ENODEV; | |
236 | return sprintf(buf, "%d\n", | |
237 | channel_pending(hv_dev->channel, | |
238 | vmbus_connection.monitor_pages[1])); | |
239 | } | |
240 | static DEVICE_ATTR_RO(server_monitor_pending); | |
241 | ||
242 | static ssize_t client_monitor_pending_show(struct device *dev, | |
243 | struct device_attribute *dev_attr, | |
244 | char *buf) | |
245 | { | |
246 | struct hv_device *hv_dev = device_to_hv_device(dev); | |
247 | ||
248 | if (!hv_dev->channel) | |
249 | return -ENODEV; | |
250 | return sprintf(buf, "%d\n", | |
251 | channel_pending(hv_dev->channel, | |
252 | vmbus_connection.monitor_pages[1])); | |
253 | } | |
254 | static DEVICE_ATTR_RO(client_monitor_pending); | |
255 | ||
256 | static ssize_t server_monitor_latency_show(struct device *dev, | |
257 | struct device_attribute *dev_attr, | |
258 | char *buf) | |
259 | { | |
260 | struct hv_device *hv_dev = device_to_hv_device(dev); | |
261 | ||
262 | if (!hv_dev->channel) | |
263 | return -ENODEV; | |
264 | return sprintf(buf, "%d\n", | |
265 | channel_latency(hv_dev->channel, | |
266 | vmbus_connection.monitor_pages[0])); | |
267 | } | |
268 | static DEVICE_ATTR_RO(server_monitor_latency); | |
269 | ||
270 | static ssize_t client_monitor_latency_show(struct device *dev, | |
271 | struct device_attribute *dev_attr, | |
272 | char *buf) | |
273 | { | |
274 | struct hv_device *hv_dev = device_to_hv_device(dev); | |
275 | ||
276 | if (!hv_dev->channel) | |
277 | return -ENODEV; | |
278 | return sprintf(buf, "%d\n", | |
279 | channel_latency(hv_dev->channel, | |
280 | vmbus_connection.monitor_pages[1])); | |
281 | } | |
282 | static DEVICE_ATTR_RO(client_monitor_latency); | |
283 | ||
284 | static ssize_t server_monitor_conn_id_show(struct device *dev, | |
285 | struct device_attribute *dev_attr, | |
286 | char *buf) | |
287 | { | |
288 | struct hv_device *hv_dev = device_to_hv_device(dev); | |
289 | ||
290 | if (!hv_dev->channel) | |
291 | return -ENODEV; | |
292 | return sprintf(buf, "%d\n", | |
293 | channel_conn_id(hv_dev->channel, | |
294 | vmbus_connection.monitor_pages[0])); | |
295 | } | |
296 | static DEVICE_ATTR_RO(server_monitor_conn_id); | |
297 | ||
298 | static ssize_t client_monitor_conn_id_show(struct device *dev, | |
299 | struct device_attribute *dev_attr, | |
300 | char *buf) | |
301 | { | |
302 | struct hv_device *hv_dev = device_to_hv_device(dev); | |
303 | ||
304 | if (!hv_dev->channel) | |
305 | return -ENODEV; | |
306 | return sprintf(buf, "%d\n", | |
307 | channel_conn_id(hv_dev->channel, | |
308 | vmbus_connection.monitor_pages[1])); | |
309 | } | |
310 | static DEVICE_ATTR_RO(client_monitor_conn_id); | |
311 | ||
312 | static ssize_t out_intr_mask_show(struct device *dev, | |
313 | struct device_attribute *dev_attr, char *buf) | |
314 | { | |
315 | struct hv_device *hv_dev = device_to_hv_device(dev); | |
316 | struct hv_ring_buffer_debug_info outbound; | |
317 | ||
318 | if (!hv_dev->channel) | |
319 | return -ENODEV; | |
320 | hv_ringbuffer_get_debuginfo(&hv_dev->channel->outbound, &outbound); | |
321 | return sprintf(buf, "%d\n", outbound.current_interrupt_mask); | |
322 | } | |
323 | static DEVICE_ATTR_RO(out_intr_mask); | |
324 | ||
325 | static ssize_t out_read_index_show(struct device *dev, | |
326 | struct device_attribute *dev_attr, char *buf) | |
327 | { | |
328 | struct hv_device *hv_dev = device_to_hv_device(dev); | |
329 | struct hv_ring_buffer_debug_info outbound; | |
330 | ||
331 | if (!hv_dev->channel) | |
332 | return -ENODEV; | |
333 | hv_ringbuffer_get_debuginfo(&hv_dev->channel->outbound, &outbound); | |
334 | return sprintf(buf, "%d\n", outbound.current_read_index); | |
335 | } | |
336 | static DEVICE_ATTR_RO(out_read_index); | |
337 | ||
338 | static ssize_t out_write_index_show(struct device *dev, | |
339 | struct device_attribute *dev_attr, | |
340 | char *buf) | |
341 | { | |
342 | struct hv_device *hv_dev = device_to_hv_device(dev); | |
343 | struct hv_ring_buffer_debug_info outbound; | |
344 | ||
345 | if (!hv_dev->channel) | |
346 | return -ENODEV; | |
347 | hv_ringbuffer_get_debuginfo(&hv_dev->channel->outbound, &outbound); | |
348 | return sprintf(buf, "%d\n", outbound.current_write_index); | |
349 | } | |
350 | static DEVICE_ATTR_RO(out_write_index); | |
351 | ||
352 | static ssize_t out_read_bytes_avail_show(struct device *dev, | |
353 | struct device_attribute *dev_attr, | |
354 | char *buf) | |
355 | { | |
356 | struct hv_device *hv_dev = device_to_hv_device(dev); | |
357 | struct hv_ring_buffer_debug_info outbound; | |
358 | ||
359 | if (!hv_dev->channel) | |
360 | return -ENODEV; | |
361 | hv_ringbuffer_get_debuginfo(&hv_dev->channel->outbound, &outbound); | |
362 | return sprintf(buf, "%d\n", outbound.bytes_avail_toread); | |
363 | } | |
364 | static DEVICE_ATTR_RO(out_read_bytes_avail); | |
365 | ||
366 | static ssize_t out_write_bytes_avail_show(struct device *dev, | |
367 | struct device_attribute *dev_attr, | |
368 | char *buf) | |
369 | { | |
370 | struct hv_device *hv_dev = device_to_hv_device(dev); | |
371 | struct hv_ring_buffer_debug_info outbound; | |
372 | ||
373 | if (!hv_dev->channel) | |
374 | return -ENODEV; | |
375 | hv_ringbuffer_get_debuginfo(&hv_dev->channel->outbound, &outbound); | |
376 | return sprintf(buf, "%d\n", outbound.bytes_avail_towrite); | |
377 | } | |
378 | static DEVICE_ATTR_RO(out_write_bytes_avail); | |
379 | ||
380 | static ssize_t in_intr_mask_show(struct device *dev, | |
381 | struct device_attribute *dev_attr, char *buf) | |
382 | { | |
383 | struct hv_device *hv_dev = device_to_hv_device(dev); | |
384 | struct hv_ring_buffer_debug_info inbound; | |
385 | ||
386 | if (!hv_dev->channel) | |
387 | return -ENODEV; | |
388 | hv_ringbuffer_get_debuginfo(&hv_dev->channel->inbound, &inbound); | |
389 | return sprintf(buf, "%d\n", inbound.current_interrupt_mask); | |
390 | } | |
391 | static DEVICE_ATTR_RO(in_intr_mask); | |
392 | ||
393 | static ssize_t in_read_index_show(struct device *dev, | |
394 | struct device_attribute *dev_attr, char *buf) | |
395 | { | |
396 | struct hv_device *hv_dev = device_to_hv_device(dev); | |
397 | struct hv_ring_buffer_debug_info inbound; | |
398 | ||
399 | if (!hv_dev->channel) | |
400 | return -ENODEV; | |
401 | hv_ringbuffer_get_debuginfo(&hv_dev->channel->inbound, &inbound); | |
402 | return sprintf(buf, "%d\n", inbound.current_read_index); | |
403 | } | |
404 | static DEVICE_ATTR_RO(in_read_index); | |
405 | ||
406 | static ssize_t in_write_index_show(struct device *dev, | |
407 | struct device_attribute *dev_attr, char *buf) | |
408 | { | |
409 | struct hv_device *hv_dev = device_to_hv_device(dev); | |
410 | struct hv_ring_buffer_debug_info inbound; | |
411 | ||
412 | if (!hv_dev->channel) | |
413 | return -ENODEV; | |
414 | hv_ringbuffer_get_debuginfo(&hv_dev->channel->inbound, &inbound); | |
415 | return sprintf(buf, "%d\n", inbound.current_write_index); | |
416 | } | |
417 | static DEVICE_ATTR_RO(in_write_index); | |
418 | ||
419 | static ssize_t in_read_bytes_avail_show(struct device *dev, | |
420 | struct device_attribute *dev_attr, | |
421 | char *buf) | |
422 | { | |
423 | struct hv_device *hv_dev = device_to_hv_device(dev); | |
424 | struct hv_ring_buffer_debug_info inbound; | |
425 | ||
426 | if (!hv_dev->channel) | |
427 | return -ENODEV; | |
428 | hv_ringbuffer_get_debuginfo(&hv_dev->channel->inbound, &inbound); | |
429 | return sprintf(buf, "%d\n", inbound.bytes_avail_toread); | |
430 | } | |
431 | static DEVICE_ATTR_RO(in_read_bytes_avail); | |
432 | ||
433 | static ssize_t in_write_bytes_avail_show(struct device *dev, | |
434 | struct device_attribute *dev_attr, | |
435 | char *buf) | |
436 | { | |
437 | struct hv_device *hv_dev = device_to_hv_device(dev); | |
438 | struct hv_ring_buffer_debug_info inbound; | |
439 | ||
440 | if (!hv_dev->channel) | |
441 | return -ENODEV; | |
442 | hv_ringbuffer_get_debuginfo(&hv_dev->channel->inbound, &inbound); | |
443 | return sprintf(buf, "%d\n", inbound.bytes_avail_towrite); | |
444 | } | |
445 | static DEVICE_ATTR_RO(in_write_bytes_avail); | |
446 | ||
447 | static ssize_t channel_vp_mapping_show(struct device *dev, | |
448 | struct device_attribute *dev_attr, | |
449 | char *buf) | |
450 | { | |
451 | struct hv_device *hv_dev = device_to_hv_device(dev); | |
452 | struct vmbus_channel *channel = hv_dev->channel, *cur_sc; | |
453 | unsigned long flags; | |
454 | int buf_size = PAGE_SIZE, n_written, tot_written; | |
455 | struct list_head *cur; | |
456 | ||
457 | if (!channel) | |
458 | return -ENODEV; | |
459 | ||
460 | tot_written = snprintf(buf, buf_size, "%u:%u\n", | |
461 | channel->offermsg.child_relid, channel->target_cpu); | |
462 | ||
463 | spin_lock_irqsave(&channel->lock, flags); | |
464 | ||
465 | list_for_each(cur, &channel->sc_list) { | |
466 | if (tot_written >= buf_size - 1) | |
467 | break; | |
468 | ||
469 | cur_sc = list_entry(cur, struct vmbus_channel, sc_list); | |
470 | n_written = scnprintf(buf + tot_written, | |
471 | buf_size - tot_written, | |
472 | "%u:%u\n", | |
473 | cur_sc->offermsg.child_relid, | |
474 | cur_sc->target_cpu); | |
475 | tot_written += n_written; | |
476 | } | |
477 | ||
478 | spin_unlock_irqrestore(&channel->lock, flags); | |
479 | ||
480 | return tot_written; | |
481 | } | |
482 | static DEVICE_ATTR_RO(channel_vp_mapping); | |
483 | ||
484 | static ssize_t vendor_show(struct device *dev, | |
485 | struct device_attribute *dev_attr, | |
486 | char *buf) | |
487 | { | |
488 | struct hv_device *hv_dev = device_to_hv_device(dev); | |
489 | return sprintf(buf, "0x%x\n", hv_dev->vendor_id); | |
490 | } | |
491 | static DEVICE_ATTR_RO(vendor); | |
492 | ||
493 | static ssize_t device_show(struct device *dev, | |
494 | struct device_attribute *dev_attr, | |
495 | char *buf) | |
496 | { | |
497 | struct hv_device *hv_dev = device_to_hv_device(dev); | |
498 | return sprintf(buf, "0x%x\n", hv_dev->device_id); | |
499 | } | |
500 | static DEVICE_ATTR_RO(device); | |
501 | ||
502 | /* Set up per device attributes in /sys/bus/vmbus/devices/<bus device> */ | |
503 | static struct attribute *vmbus_attrs[] = { | |
504 | &dev_attr_id.attr, | |
505 | &dev_attr_state.attr, | |
506 | &dev_attr_monitor_id.attr, | |
507 | &dev_attr_class_id.attr, | |
508 | &dev_attr_device_id.attr, | |
509 | &dev_attr_modalias.attr, | |
510 | &dev_attr_server_monitor_pending.attr, | |
511 | &dev_attr_client_monitor_pending.attr, | |
512 | &dev_attr_server_monitor_latency.attr, | |
513 | &dev_attr_client_monitor_latency.attr, | |
514 | &dev_attr_server_monitor_conn_id.attr, | |
515 | &dev_attr_client_monitor_conn_id.attr, | |
516 | &dev_attr_out_intr_mask.attr, | |
517 | &dev_attr_out_read_index.attr, | |
518 | &dev_attr_out_write_index.attr, | |
519 | &dev_attr_out_read_bytes_avail.attr, | |
520 | &dev_attr_out_write_bytes_avail.attr, | |
521 | &dev_attr_in_intr_mask.attr, | |
522 | &dev_attr_in_read_index.attr, | |
523 | &dev_attr_in_write_index.attr, | |
524 | &dev_attr_in_read_bytes_avail.attr, | |
525 | &dev_attr_in_write_bytes_avail.attr, | |
526 | &dev_attr_channel_vp_mapping.attr, | |
527 | &dev_attr_vendor.attr, | |
528 | &dev_attr_device.attr, | |
529 | NULL, | |
530 | }; | |
531 | ATTRIBUTE_GROUPS(vmbus); | |
532 | ||
533 | /* | |
534 | * vmbus_uevent - add uevent for our device | |
535 | * | |
536 | * This routine is invoked when a device is added or removed on the vmbus to | |
537 | * generate a uevent to udev in the userspace. The udev will then look at its | |
538 | * rule and the uevent generated here to load the appropriate driver | |
539 | * | |
540 | * The alias string will be of the form vmbus:guid where guid is the string | |
541 | * representation of the device guid (each byte of the guid will be | |
542 | * represented with two hex characters. | |
543 | */ | |
544 | static int vmbus_uevent(struct device *device, struct kobj_uevent_env *env) | |
545 | { | |
546 | struct hv_device *dev = device_to_hv_device(device); | |
547 | int ret; | |
548 | char alias_name[VMBUS_ALIAS_LEN + 1]; | |
549 | ||
550 | print_alias_name(dev, alias_name); | |
551 | ret = add_uevent_var(env, "MODALIAS=vmbus:%s", alias_name); | |
552 | return ret; | |
553 | } | |
554 | ||
555 | static const uuid_le null_guid; | |
556 | ||
557 | static inline bool is_null_guid(const uuid_le *guid) | |
558 | { | |
559 | if (uuid_le_cmp(*guid, null_guid)) | |
560 | return false; | |
561 | return true; | |
562 | } | |
563 | ||
564 | /* | |
565 | * Return a matching hv_vmbus_device_id pointer. | |
566 | * If there is no match, return NULL. | |
567 | */ | |
568 | static const struct hv_vmbus_device_id *hv_vmbus_get_id( | |
569 | const struct hv_vmbus_device_id *id, | |
570 | const uuid_le *guid) | |
571 | { | |
572 | for (; !is_null_guid(&id->guid); id++) | |
573 | if (!uuid_le_cmp(id->guid, *guid)) | |
574 | return id; | |
575 | ||
576 | return NULL; | |
577 | } | |
578 | ||
579 | ||
580 | ||
581 | /* | |
582 | * vmbus_match - Attempt to match the specified device to the specified driver | |
583 | */ | |
584 | static int vmbus_match(struct device *device, struct device_driver *driver) | |
585 | { | |
586 | struct hv_driver *drv = drv_to_hv_drv(driver); | |
587 | struct hv_device *hv_dev = device_to_hv_device(device); | |
588 | ||
589 | /* The hv_sock driver handles all hv_sock offers. */ | |
590 | if (is_hvsock_channel(hv_dev->channel)) | |
591 | return drv->hvsock; | |
592 | ||
593 | if (hv_vmbus_get_id(drv->id_table, &hv_dev->dev_type)) | |
594 | return 1; | |
595 | ||
596 | return 0; | |
597 | } | |
598 | ||
599 | /* | |
600 | * vmbus_probe - Add the new vmbus's child device | |
601 | */ | |
602 | static int vmbus_probe(struct device *child_device) | |
603 | { | |
604 | int ret = 0; | |
605 | struct hv_driver *drv = | |
606 | drv_to_hv_drv(child_device->driver); | |
607 | struct hv_device *dev = device_to_hv_device(child_device); | |
608 | const struct hv_vmbus_device_id *dev_id; | |
609 | ||
610 | dev_id = hv_vmbus_get_id(drv->id_table, &dev->dev_type); | |
611 | if (drv->probe) { | |
612 | ret = drv->probe(dev, dev_id); | |
613 | if (ret != 0) | |
614 | pr_err("probe failed for device %s (%d)\n", | |
615 | dev_name(child_device), ret); | |
616 | ||
617 | } else { | |
618 | pr_err("probe not set for driver %s\n", | |
619 | dev_name(child_device)); | |
620 | ret = -ENODEV; | |
621 | } | |
622 | return ret; | |
623 | } | |
624 | ||
625 | /* | |
626 | * vmbus_remove - Remove a vmbus device | |
627 | */ | |
628 | static int vmbus_remove(struct device *child_device) | |
629 | { | |
630 | struct hv_driver *drv; | |
631 | struct hv_device *dev = device_to_hv_device(child_device); | |
632 | ||
633 | if (child_device->driver) { | |
634 | drv = drv_to_hv_drv(child_device->driver); | |
635 | if (drv->remove) | |
636 | drv->remove(dev); | |
637 | } | |
638 | ||
639 | return 0; | |
640 | } | |
641 | ||
642 | ||
643 | /* | |
644 | * vmbus_shutdown - Shutdown a vmbus device | |
645 | */ | |
646 | static void vmbus_shutdown(struct device *child_device) | |
647 | { | |
648 | struct hv_driver *drv; | |
649 | struct hv_device *dev = device_to_hv_device(child_device); | |
650 | ||
651 | ||
652 | /* The device may not be attached yet */ | |
653 | if (!child_device->driver) | |
654 | return; | |
655 | ||
656 | drv = drv_to_hv_drv(child_device->driver); | |
657 | ||
658 | if (drv->shutdown) | |
659 | drv->shutdown(dev); | |
660 | ||
661 | return; | |
662 | } | |
663 | ||
664 | ||
665 | /* | |
666 | * vmbus_device_release - Final callback release of the vmbus child device | |
667 | */ | |
668 | static void vmbus_device_release(struct device *device) | |
669 | { | |
670 | struct hv_device *hv_dev = device_to_hv_device(device); | |
671 | struct vmbus_channel *channel = hv_dev->channel; | |
672 | ||
673 | hv_process_channel_removal(channel, | |
674 | channel->offermsg.child_relid); | |
675 | kfree(hv_dev); | |
676 | ||
677 | } | |
678 | ||
679 | /* The one and only one */ | |
680 | static struct bus_type hv_bus = { | |
681 | .name = "vmbus", | |
682 | .match = vmbus_match, | |
683 | .shutdown = vmbus_shutdown, | |
684 | .remove = vmbus_remove, | |
685 | .probe = vmbus_probe, | |
686 | .uevent = vmbus_uevent, | |
687 | .dev_groups = vmbus_groups, | |
688 | }; | |
689 | ||
690 | struct onmessage_work_context { | |
691 | struct work_struct work; | |
692 | struct hv_message msg; | |
693 | }; | |
694 | ||
695 | static void vmbus_onmessage_work(struct work_struct *work) | |
696 | { | |
697 | struct onmessage_work_context *ctx; | |
698 | ||
699 | /* Do not process messages if we're in DISCONNECTED state */ | |
700 | if (vmbus_connection.conn_state == DISCONNECTED) | |
701 | return; | |
702 | ||
703 | ctx = container_of(work, struct onmessage_work_context, | |
704 | work); | |
705 | vmbus_onmessage(&ctx->msg); | |
706 | kfree(ctx); | |
707 | } | |
708 | ||
709 | static void hv_process_timer_expiration(struct hv_message *msg, int cpu) | |
710 | { | |
711 | struct clock_event_device *dev = hv_context.clk_evt[cpu]; | |
712 | ||
713 | if (dev->event_handler) | |
714 | dev->event_handler(dev); | |
715 | ||
716 | vmbus_signal_eom(msg, HVMSG_TIMER_EXPIRED); | |
717 | } | |
718 | ||
719 | void vmbus_on_msg_dpc(unsigned long data) | |
720 | { | |
721 | int cpu = smp_processor_id(); | |
722 | void *page_addr = hv_context.synic_message_page[cpu]; | |
723 | struct hv_message *msg = (struct hv_message *)page_addr + | |
724 | VMBUS_MESSAGE_SINT; | |
725 | struct vmbus_channel_message_header *hdr; | |
726 | struct vmbus_channel_message_table_entry *entry; | |
727 | struct onmessage_work_context *ctx; | |
728 | u32 message_type = msg->header.message_type; | |
729 | ||
730 | if (message_type == HVMSG_NONE) | |
731 | /* no msg */ | |
732 | return; | |
733 | ||
734 | hdr = (struct vmbus_channel_message_header *)msg->u.payload; | |
735 | ||
736 | if (hdr->msgtype >= CHANNELMSG_COUNT) { | |
737 | WARN_ONCE(1, "unknown msgtype=%d\n", hdr->msgtype); | |
738 | goto msg_handled; | |
739 | } | |
740 | ||
741 | entry = &channel_message_table[hdr->msgtype]; | |
742 | if (entry->handler_type == VMHT_BLOCKING) { | |
743 | ctx = kmalloc(sizeof(*ctx), GFP_ATOMIC); | |
744 | if (ctx == NULL) | |
745 | return; | |
746 | ||
747 | INIT_WORK(&ctx->work, vmbus_onmessage_work); | |
748 | memcpy(&ctx->msg, msg, sizeof(*msg)); | |
749 | ||
750 | queue_work(vmbus_connection.work_queue, &ctx->work); | |
751 | } else | |
752 | entry->message_handler(hdr); | |
753 | ||
754 | msg_handled: | |
755 | vmbus_signal_eom(msg, message_type); | |
756 | } | |
757 | ||
758 | static void vmbus_isr(void) | |
759 | { | |
760 | int cpu = smp_processor_id(); | |
761 | void *page_addr; | |
762 | struct hv_message *msg; | |
763 | union hv_synic_event_flags *event; | |
764 | bool handled = false; | |
765 | ||
766 | page_addr = hv_context.synic_event_page[cpu]; | |
767 | if (page_addr == NULL) | |
768 | return; | |
769 | ||
770 | event = (union hv_synic_event_flags *)page_addr + | |
771 | VMBUS_MESSAGE_SINT; | |
772 | /* | |
773 | * Check for events before checking for messages. This is the order | |
774 | * in which events and messages are checked in Windows guests on | |
775 | * Hyper-V, and the Windows team suggested we do the same. | |
776 | */ | |
777 | ||
778 | if ((vmbus_proto_version == VERSION_WS2008) || | |
779 | (vmbus_proto_version == VERSION_WIN7)) { | |
780 | ||
781 | /* Since we are a child, we only need to check bit 0 */ | |
782 | if (sync_test_and_clear_bit(0, | |
783 | (unsigned long *) &event->flags32[0])) { | |
784 | handled = true; | |
785 | } | |
786 | } else { | |
787 | /* | |
788 | * Our host is win8 or above. The signaling mechanism | |
789 | * has changed and we can directly look at the event page. | |
790 | * If bit n is set then we have an interrup on the channel | |
791 | * whose id is n. | |
792 | */ | |
793 | handled = true; | |
794 | } | |
795 | ||
796 | if (handled) | |
797 | tasklet_schedule(hv_context.event_dpc[cpu]); | |
798 | ||
799 | ||
800 | page_addr = hv_context.synic_message_page[cpu]; | |
801 | msg = (struct hv_message *)page_addr + VMBUS_MESSAGE_SINT; | |
802 | ||
803 | /* Check if there are actual msgs to be processed */ | |
804 | if (msg->header.message_type != HVMSG_NONE) { | |
805 | if (msg->header.message_type == HVMSG_TIMER_EXPIRED) | |
806 | hv_process_timer_expiration(msg, cpu); | |
807 | else | |
808 | tasklet_schedule(hv_context.msg_dpc[cpu]); | |
809 | } | |
810 | ||
811 | add_interrupt_randomness(HYPERVISOR_CALLBACK_VECTOR, 0); | |
812 | } | |
813 | ||
814 | ||
815 | /* | |
816 | * vmbus_bus_init -Main vmbus driver initialization routine. | |
817 | * | |
818 | * Here, we | |
819 | * - initialize the vmbus driver context | |
820 | * - invoke the vmbus hv main init routine | |
821 | * - retrieve the channel offers | |
822 | */ | |
823 | static int vmbus_bus_init(void) | |
824 | { | |
825 | int ret; | |
826 | ||
827 | /* Hypervisor initialization...setup hypercall page..etc */ | |
828 | ret = hv_init(); | |
829 | if (ret != 0) { | |
830 | pr_err("Unable to initialize the hypervisor - 0x%x\n", ret); | |
831 | return ret; | |
832 | } | |
833 | ||
834 | ret = bus_register(&hv_bus); | |
835 | if (ret) | |
836 | goto err_cleanup; | |
837 | ||
838 | hv_setup_vmbus_irq(vmbus_isr); | |
839 | ||
840 | ret = hv_synic_alloc(); | |
841 | if (ret) | |
842 | goto err_alloc; | |
843 | /* | |
844 | * Initialize the per-cpu interrupt state and | |
845 | * connect to the host. | |
846 | */ | |
847 | on_each_cpu(hv_synic_init, NULL, 1); | |
848 | ret = vmbus_connect(); | |
849 | if (ret) | |
850 | goto err_connect; | |
851 | ||
852 | if (vmbus_proto_version > VERSION_WIN7) | |
853 | cpu_hotplug_disable(); | |
854 | ||
855 | /* | |
856 | * Only register if the crash MSRs are available | |
857 | */ | |
858 | if (ms_hyperv.misc_features & HV_FEATURE_GUEST_CRASH_MSR_AVAILABLE) { | |
859 | register_die_notifier(&hyperv_die_block); | |
860 | atomic_notifier_chain_register(&panic_notifier_list, | |
861 | &hyperv_panic_block); | |
862 | } | |
863 | ||
864 | vmbus_request_offers(); | |
865 | ||
866 | return 0; | |
867 | ||
868 | err_connect: | |
869 | on_each_cpu(hv_synic_cleanup, NULL, 1); | |
870 | err_alloc: | |
871 | hv_synic_free(); | |
872 | hv_remove_vmbus_irq(); | |
873 | ||
874 | bus_unregister(&hv_bus); | |
875 | ||
876 | err_cleanup: | |
877 | hv_cleanup(false); | |
878 | ||
879 | return ret; | |
880 | } | |
881 | ||
882 | /** | |
883 | * __vmbus_child_driver_register() - Register a vmbus's driver | |
884 | * @hv_driver: Pointer to driver structure you want to register | |
885 | * @owner: owner module of the drv | |
886 | * @mod_name: module name string | |
887 | * | |
888 | * Registers the given driver with Linux through the 'driver_register()' call | |
889 | * and sets up the hyper-v vmbus handling for this driver. | |
890 | * It will return the state of the 'driver_register()' call. | |
891 | * | |
892 | */ | |
893 | int __vmbus_driver_register(struct hv_driver *hv_driver, struct module *owner, const char *mod_name) | |
894 | { | |
895 | int ret; | |
896 | ||
897 | pr_info("registering driver %s\n", hv_driver->name); | |
898 | ||
899 | ret = vmbus_exists(); | |
900 | if (ret < 0) | |
901 | return ret; | |
902 | ||
903 | hv_driver->driver.name = hv_driver->name; | |
904 | hv_driver->driver.owner = owner; | |
905 | hv_driver->driver.mod_name = mod_name; | |
906 | hv_driver->driver.bus = &hv_bus; | |
907 | ||
908 | ret = driver_register(&hv_driver->driver); | |
909 | ||
910 | return ret; | |
911 | } | |
912 | EXPORT_SYMBOL_GPL(__vmbus_driver_register); | |
913 | ||
914 | /** | |
915 | * vmbus_driver_unregister() - Unregister a vmbus's driver | |
916 | * @hv_driver: Pointer to driver structure you want to | |
917 | * un-register | |
918 | * | |
919 | * Un-register the given driver that was previous registered with a call to | |
920 | * vmbus_driver_register() | |
921 | */ | |
922 | void vmbus_driver_unregister(struct hv_driver *hv_driver) | |
923 | { | |
924 | pr_info("unregistering driver %s\n", hv_driver->name); | |
925 | ||
926 | if (!vmbus_exists()) | |
927 | driver_unregister(&hv_driver->driver); | |
928 | } | |
929 | EXPORT_SYMBOL_GPL(vmbus_driver_unregister); | |
930 | ||
931 | /* | |
932 | * vmbus_device_create - Creates and registers a new child device | |
933 | * on the vmbus. | |
934 | */ | |
935 | struct hv_device *vmbus_device_create(const uuid_le *type, | |
936 | const uuid_le *instance, | |
937 | struct vmbus_channel *channel) | |
938 | { | |
939 | struct hv_device *child_device_obj; | |
940 | ||
941 | child_device_obj = kzalloc(sizeof(struct hv_device), GFP_KERNEL); | |
942 | if (!child_device_obj) { | |
943 | pr_err("Unable to allocate device object for child device\n"); | |
944 | return NULL; | |
945 | } | |
946 | ||
947 | child_device_obj->channel = channel; | |
948 | memcpy(&child_device_obj->dev_type, type, sizeof(uuid_le)); | |
949 | memcpy(&child_device_obj->dev_instance, instance, | |
950 | sizeof(uuid_le)); | |
951 | child_device_obj->vendor_id = 0x1414; /* MSFT vendor ID */ | |
952 | ||
953 | ||
954 | return child_device_obj; | |
955 | } | |
956 | ||
957 | /* | |
958 | * vmbus_device_register - Register the child device | |
959 | */ | |
960 | int vmbus_device_register(struct hv_device *child_device_obj) | |
961 | { | |
962 | int ret = 0; | |
963 | ||
964 | dev_set_name(&child_device_obj->device, "vmbus_%d", | |
965 | child_device_obj->channel->id); | |
966 | ||
967 | child_device_obj->device.bus = &hv_bus; | |
968 | child_device_obj->device.parent = &hv_acpi_dev->dev; | |
969 | child_device_obj->device.release = vmbus_device_release; | |
970 | ||
971 | /* | |
972 | * Register with the LDM. This will kick off the driver/device | |
973 | * binding...which will eventually call vmbus_match() and vmbus_probe() | |
974 | */ | |
975 | ret = device_register(&child_device_obj->device); | |
976 | ||
977 | if (ret) | |
978 | pr_err("Unable to register child device\n"); | |
979 | else | |
980 | pr_debug("child device %s registered\n", | |
981 | dev_name(&child_device_obj->device)); | |
982 | ||
983 | return ret; | |
984 | } | |
985 | ||
986 | /* | |
987 | * vmbus_device_unregister - Remove the specified child device | |
988 | * from the vmbus. | |
989 | */ | |
990 | void vmbus_device_unregister(struct hv_device *device_obj) | |
991 | { | |
992 | pr_debug("child device %s unregistered\n", | |
993 | dev_name(&device_obj->device)); | |
994 | ||
995 | /* | |
996 | * Kick off the process of unregistering the device. | |
997 | * This will call vmbus_remove() and eventually vmbus_device_release() | |
998 | */ | |
999 | device_unregister(&device_obj->device); | |
1000 | } | |
1001 | ||
1002 | ||
1003 | /* | |
1004 | * VMBUS is an acpi enumerated device. Get the information we | |
1005 | * need from DSDT. | |
1006 | */ | |
1007 | #define VTPM_BASE_ADDRESS 0xfed40000 | |
1008 | static acpi_status vmbus_walk_resources(struct acpi_resource *res, void *ctx) | |
1009 | { | |
1010 | resource_size_t start = 0; | |
1011 | resource_size_t end = 0; | |
1012 | struct resource *new_res; | |
1013 | struct resource **old_res = &hyperv_mmio; | |
1014 | struct resource **prev_res = NULL; | |
1015 | ||
1016 | switch (res->type) { | |
1017 | ||
1018 | /* | |
1019 | * "Address" descriptors are for bus windows. Ignore | |
1020 | * "memory" descriptors, which are for registers on | |
1021 | * devices. | |
1022 | */ | |
1023 | case ACPI_RESOURCE_TYPE_ADDRESS32: | |
1024 | start = res->data.address32.address.minimum; | |
1025 | end = res->data.address32.address.maximum; | |
1026 | break; | |
1027 | ||
1028 | case ACPI_RESOURCE_TYPE_ADDRESS64: | |
1029 | start = res->data.address64.address.minimum; | |
1030 | end = res->data.address64.address.maximum; | |
1031 | break; | |
1032 | ||
1033 | default: | |
1034 | /* Unused resource type */ | |
1035 | return AE_OK; | |
1036 | ||
1037 | } | |
1038 | /* | |
1039 | * Ignore ranges that are below 1MB, as they're not | |
1040 | * necessary or useful here. | |
1041 | */ | |
1042 | if (end < 0x100000) | |
1043 | return AE_OK; | |
1044 | ||
1045 | new_res = kzalloc(sizeof(*new_res), GFP_ATOMIC); | |
1046 | if (!new_res) | |
1047 | return AE_NO_MEMORY; | |
1048 | ||
1049 | /* If this range overlaps the virtual TPM, truncate it. */ | |
1050 | if (end > VTPM_BASE_ADDRESS && start < VTPM_BASE_ADDRESS) | |
1051 | end = VTPM_BASE_ADDRESS; | |
1052 | ||
1053 | new_res->name = "hyperv mmio"; | |
1054 | new_res->flags = IORESOURCE_MEM; | |
1055 | new_res->start = start; | |
1056 | new_res->end = end; | |
1057 | ||
1058 | /* | |
1059 | * If two ranges are adjacent, merge them. | |
1060 | */ | |
1061 | do { | |
1062 | if (!*old_res) { | |
1063 | *old_res = new_res; | |
1064 | break; | |
1065 | } | |
1066 | ||
1067 | if (((*old_res)->end + 1) == new_res->start) { | |
1068 | (*old_res)->end = new_res->end; | |
1069 | kfree(new_res); | |
1070 | break; | |
1071 | } | |
1072 | ||
1073 | if ((*old_res)->start == new_res->end + 1) { | |
1074 | (*old_res)->start = new_res->start; | |
1075 | kfree(new_res); | |
1076 | break; | |
1077 | } | |
1078 | ||
1079 | if ((*old_res)->start > new_res->end) { | |
1080 | new_res->sibling = *old_res; | |
1081 | if (prev_res) | |
1082 | (*prev_res)->sibling = new_res; | |
1083 | *old_res = new_res; | |
1084 | break; | |
1085 | } | |
1086 | ||
1087 | prev_res = old_res; | |
1088 | old_res = &(*old_res)->sibling; | |
1089 | ||
1090 | } while (1); | |
1091 | ||
1092 | return AE_OK; | |
1093 | } | |
1094 | ||
1095 | static int vmbus_acpi_remove(struct acpi_device *device) | |
1096 | { | |
1097 | struct resource *cur_res; | |
1098 | struct resource *next_res; | |
1099 | ||
1100 | if (hyperv_mmio) { | |
1101 | if (fb_mmio) { | |
1102 | __release_region(hyperv_mmio, fb_mmio->start, | |
1103 | resource_size(fb_mmio)); | |
1104 | fb_mmio = NULL; | |
1105 | } | |
1106 | ||
1107 | for (cur_res = hyperv_mmio; cur_res; cur_res = next_res) { | |
1108 | next_res = cur_res->sibling; | |
1109 | kfree(cur_res); | |
1110 | } | |
1111 | } | |
1112 | ||
1113 | return 0; | |
1114 | } | |
1115 | ||
1116 | static void vmbus_reserve_fb(void) | |
1117 | { | |
1118 | int size; | |
1119 | /* | |
1120 | * Make a claim for the frame buffer in the resource tree under the | |
1121 | * first node, which will be the one below 4GB. The length seems to | |
1122 | * be underreported, particularly in a Generation 1 VM. So start out | |
1123 | * reserving a larger area and make it smaller until it succeeds. | |
1124 | */ | |
1125 | ||
1126 | if (screen_info.lfb_base) { | |
1127 | if (efi_enabled(EFI_BOOT)) | |
1128 | size = max_t(__u32, screen_info.lfb_size, 0x800000); | |
1129 | else | |
1130 | size = max_t(__u32, screen_info.lfb_size, 0x4000000); | |
1131 | ||
1132 | for (; !fb_mmio && (size >= 0x100000); size >>= 1) { | |
1133 | fb_mmio = __request_region(hyperv_mmio, | |
1134 | screen_info.lfb_base, size, | |
1135 | fb_mmio_name, 0); | |
1136 | } | |
1137 | } | |
1138 | } | |
1139 | ||
1140 | /** | |
1141 | * vmbus_allocate_mmio() - Pick a memory-mapped I/O range. | |
1142 | * @new: If successful, supplied a pointer to the | |
1143 | * allocated MMIO space. | |
1144 | * @device_obj: Identifies the caller | |
1145 | * @min: Minimum guest physical address of the | |
1146 | * allocation | |
1147 | * @max: Maximum guest physical address | |
1148 | * @size: Size of the range to be allocated | |
1149 | * @align: Alignment of the range to be allocated | |
1150 | * @fb_overlap_ok: Whether this allocation can be allowed | |
1151 | * to overlap the video frame buffer. | |
1152 | * | |
1153 | * This function walks the resources granted to VMBus by the | |
1154 | * _CRS object in the ACPI namespace underneath the parent | |
1155 | * "bridge" whether that's a root PCI bus in the Generation 1 | |
1156 | * case or a Module Device in the Generation 2 case. It then | |
1157 | * attempts to allocate from the global MMIO pool in a way that | |
1158 | * matches the constraints supplied in these parameters and by | |
1159 | * that _CRS. | |
1160 | * | |
1161 | * Return: 0 on success, -errno on failure | |
1162 | */ | |
1163 | int vmbus_allocate_mmio(struct resource **new, struct hv_device *device_obj, | |
1164 | resource_size_t min, resource_size_t max, | |
1165 | resource_size_t size, resource_size_t align, | |
1166 | bool fb_overlap_ok) | |
1167 | { | |
1168 | struct resource *iter, *shadow; | |
1169 | resource_size_t range_min, range_max, start; | |
1170 | const char *dev_n = dev_name(&device_obj->device); | |
1171 | int retval; | |
1172 | ||
1173 | retval = -ENXIO; | |
1174 | down(&hyperv_mmio_lock); | |
1175 | ||
1176 | /* | |
1177 | * If overlaps with frame buffers are allowed, then first attempt to | |
1178 | * make the allocation from within the reserved region. Because it | |
1179 | * is already reserved, no shadow allocation is necessary. | |
1180 | */ | |
1181 | if (fb_overlap_ok && fb_mmio && !(min > fb_mmio->end) && | |
1182 | !(max < fb_mmio->start)) { | |
1183 | ||
1184 | range_min = fb_mmio->start; | |
1185 | range_max = fb_mmio->end; | |
1186 | start = (range_min + align - 1) & ~(align - 1); | |
1187 | for (; start + size - 1 <= range_max; start += align) { | |
1188 | *new = request_mem_region_exclusive(start, size, dev_n); | |
1189 | if (*new) { | |
1190 | retval = 0; | |
1191 | goto exit; | |
1192 | } | |
1193 | } | |
1194 | } | |
1195 | ||
1196 | for (iter = hyperv_mmio; iter; iter = iter->sibling) { | |
1197 | if ((iter->start >= max) || (iter->end <= min)) | |
1198 | continue; | |
1199 | ||
1200 | range_min = iter->start; | |
1201 | range_max = iter->end; | |
1202 | start = (range_min + align - 1) & ~(align - 1); | |
1203 | for (; start + size - 1 <= range_max; start += align) { | |
1204 | shadow = __request_region(iter, start, size, NULL, | |
1205 | IORESOURCE_BUSY); | |
1206 | if (!shadow) | |
1207 | continue; | |
1208 | ||
1209 | *new = request_mem_region_exclusive(start, size, dev_n); | |
1210 | if (*new) { | |
1211 | shadow->name = (char *)*new; | |
1212 | retval = 0; | |
1213 | goto exit; | |
1214 | } | |
1215 | ||
1216 | __release_region(iter, start, size); | |
1217 | } | |
1218 | } | |
1219 | ||
1220 | exit: | |
1221 | up(&hyperv_mmio_lock); | |
1222 | return retval; | |
1223 | } | |
1224 | EXPORT_SYMBOL_GPL(vmbus_allocate_mmio); | |
1225 | ||
1226 | /** | |
1227 | * vmbus_free_mmio() - Free a memory-mapped I/O range. | |
1228 | * @start: Base address of region to release. | |
1229 | * @size: Size of the range to be allocated | |
1230 | * | |
1231 | * This function releases anything requested by | |
1232 | * vmbus_mmio_allocate(). | |
1233 | */ | |
1234 | void vmbus_free_mmio(resource_size_t start, resource_size_t size) | |
1235 | { | |
1236 | struct resource *iter; | |
1237 | ||
1238 | down(&hyperv_mmio_lock); | |
1239 | for (iter = hyperv_mmio; iter; iter = iter->sibling) { | |
1240 | if ((iter->start >= start + size) || (iter->end <= start)) | |
1241 | continue; | |
1242 | ||
1243 | __release_region(iter, start, size); | |
1244 | } | |
1245 | release_mem_region(start, size); | |
1246 | up(&hyperv_mmio_lock); | |
1247 | ||
1248 | } | |
1249 | EXPORT_SYMBOL_GPL(vmbus_free_mmio); | |
1250 | ||
1251 | /** | |
1252 | * vmbus_cpu_number_to_vp_number() - Map CPU to VP. | |
1253 | * @cpu_number: CPU number in Linux terms | |
1254 | * | |
1255 | * This function returns the mapping between the Linux processor | |
1256 | * number and the hypervisor's virtual processor number, useful | |
1257 | * in making hypercalls and such that talk about specific | |
1258 | * processors. | |
1259 | * | |
1260 | * Return: Virtual processor number in Hyper-V terms | |
1261 | */ | |
1262 | int vmbus_cpu_number_to_vp_number(int cpu_number) | |
1263 | { | |
1264 | return hv_context.vp_index[cpu_number]; | |
1265 | } | |
1266 | EXPORT_SYMBOL_GPL(vmbus_cpu_number_to_vp_number); | |
1267 | ||
1268 | static int vmbus_acpi_add(struct acpi_device *device) | |
1269 | { | |
1270 | acpi_status result; | |
1271 | int ret_val = -ENODEV; | |
1272 | struct acpi_device *ancestor; | |
1273 | ||
1274 | hv_acpi_dev = device; | |
1275 | ||
1276 | result = acpi_walk_resources(device->handle, METHOD_NAME__CRS, | |
1277 | vmbus_walk_resources, NULL); | |
1278 | ||
1279 | if (ACPI_FAILURE(result)) | |
1280 | goto acpi_walk_err; | |
1281 | /* | |
1282 | * Some ancestor of the vmbus acpi device (Gen1 or Gen2 | |
1283 | * firmware) is the VMOD that has the mmio ranges. Get that. | |
1284 | */ | |
1285 | for (ancestor = device->parent; ancestor; ancestor = ancestor->parent) { | |
1286 | result = acpi_walk_resources(ancestor->handle, METHOD_NAME__CRS, | |
1287 | vmbus_walk_resources, NULL); | |
1288 | ||
1289 | if (ACPI_FAILURE(result)) | |
1290 | continue; | |
1291 | if (hyperv_mmio) { | |
1292 | vmbus_reserve_fb(); | |
1293 | break; | |
1294 | } | |
1295 | } | |
1296 | ret_val = 0; | |
1297 | ||
1298 | acpi_walk_err: | |
1299 | complete(&probe_event); | |
1300 | if (ret_val) | |
1301 | vmbus_acpi_remove(device); | |
1302 | return ret_val; | |
1303 | } | |
1304 | ||
1305 | static const struct acpi_device_id vmbus_acpi_device_ids[] = { | |
1306 | {"VMBUS", 0}, | |
1307 | {"VMBus", 0}, | |
1308 | {"", 0}, | |
1309 | }; | |
1310 | MODULE_DEVICE_TABLE(acpi, vmbus_acpi_device_ids); | |
1311 | ||
1312 | static struct acpi_driver vmbus_acpi_driver = { | |
1313 | .name = "vmbus", | |
1314 | .ids = vmbus_acpi_device_ids, | |
1315 | .ops = { | |
1316 | .add = vmbus_acpi_add, | |
1317 | .remove = vmbus_acpi_remove, | |
1318 | }, | |
1319 | }; | |
1320 | ||
1321 | static void hv_kexec_handler(void) | |
1322 | { | |
1323 | int cpu; | |
1324 | ||
1325 | hv_synic_clockevents_cleanup(); | |
1326 | vmbus_initiate_unload(false); | |
1327 | for_each_online_cpu(cpu) | |
1328 | smp_call_function_single(cpu, hv_synic_cleanup, NULL, 1); | |
1329 | hv_cleanup(false); | |
1330 | }; | |
1331 | ||
1332 | static void hv_crash_handler(struct pt_regs *regs) | |
1333 | { | |
1334 | vmbus_initiate_unload(true); | |
1335 | /* | |
1336 | * In crash handler we can't schedule synic cleanup for all CPUs, | |
1337 | * doing the cleanup for current CPU only. This should be sufficient | |
1338 | * for kdump. | |
1339 | */ | |
1340 | hv_synic_cleanup(NULL); | |
1341 | hv_cleanup(true); | |
1342 | }; | |
1343 | ||
1344 | static int __init hv_acpi_init(void) | |
1345 | { | |
1346 | int ret, t; | |
1347 | ||
1348 | if (x86_hyper != &x86_hyper_ms_hyperv) | |
1349 | return -ENODEV; | |
1350 | ||
1351 | init_completion(&probe_event); | |
1352 | ||
1353 | /* | |
1354 | * Get ACPI resources first. | |
1355 | */ | |
1356 | ret = acpi_bus_register_driver(&vmbus_acpi_driver); | |
1357 | ||
1358 | if (ret) | |
1359 | return ret; | |
1360 | ||
1361 | t = wait_for_completion_timeout(&probe_event, 5*HZ); | |
1362 | if (t == 0) { | |
1363 | ret = -ETIMEDOUT; | |
1364 | goto cleanup; | |
1365 | } | |
1366 | ||
1367 | ret = vmbus_bus_init(); | |
1368 | if (ret) | |
1369 | goto cleanup; | |
1370 | ||
1371 | hv_setup_kexec_handler(hv_kexec_handler); | |
1372 | hv_setup_crash_handler(hv_crash_handler); | |
1373 | ||
1374 | return 0; | |
1375 | ||
1376 | cleanup: | |
1377 | acpi_bus_unregister_driver(&vmbus_acpi_driver); | |
1378 | hv_acpi_dev = NULL; | |
1379 | return ret; | |
1380 | } | |
1381 | ||
1382 | static void __exit vmbus_exit(void) | |
1383 | { | |
1384 | int cpu; | |
1385 | ||
1386 | hv_remove_kexec_handler(); | |
1387 | hv_remove_crash_handler(); | |
1388 | vmbus_connection.conn_state = DISCONNECTED; | |
1389 | hv_synic_clockevents_cleanup(); | |
1390 | vmbus_disconnect(); | |
1391 | hv_remove_vmbus_irq(); | |
1392 | for_each_online_cpu(cpu) | |
1393 | tasklet_kill(hv_context.msg_dpc[cpu]); | |
1394 | vmbus_free_channels(); | |
1395 | if (ms_hyperv.misc_features & HV_FEATURE_GUEST_CRASH_MSR_AVAILABLE) { | |
1396 | unregister_die_notifier(&hyperv_die_block); | |
1397 | atomic_notifier_chain_unregister(&panic_notifier_list, | |
1398 | &hyperv_panic_block); | |
1399 | } | |
1400 | bus_unregister(&hv_bus); | |
1401 | hv_cleanup(false); | |
1402 | for_each_online_cpu(cpu) { | |
1403 | tasklet_kill(hv_context.event_dpc[cpu]); | |
1404 | smp_call_function_single(cpu, hv_synic_cleanup, NULL, 1); | |
1405 | } | |
1406 | hv_synic_free(); | |
1407 | acpi_bus_unregister_driver(&vmbus_acpi_driver); | |
1408 | if (vmbus_proto_version > VERSION_WIN7) | |
1409 | cpu_hotplug_enable(); | |
1410 | } | |
1411 | ||
1412 | ||
1413 | MODULE_LICENSE("GPL"); | |
1414 | ||
1415 | subsys_initcall(hv_acpi_init); | |
1416 | module_exit(vmbus_exit); |